zig/src/ir.cpp

/*
 * Copyright (c) 2016 Andrew Kelley
 *
 * This file is part of zig, which is MIT licensed.
 * See http://opensource.org/licenses/MIT
 */

#include "analyze.hpp"
#include "ast_render.hpp"
#include "error.hpp"
#include "eval.hpp"
#include "ir.hpp"
#include "ir_print.hpp"
#include "os.hpp"
#include "parseh.hpp"

struct IrExecContext {
    ConstExprValue *mem_slot_list;
    size_t mem_slot_count;
};

struct LoopStackItem {
    IrBasicBlock *break_block;
    IrBasicBlock *continue_block;
    bool is_inline;
};

struct IrBuilder {
    CodeGen *codegen;
    IrExecutable *exec;
    IrBasicBlock *current_basic_block;
    ZigList<LoopStackItem> loop_stack;
};

struct IrAnalyze {
    CodeGen *codegen;
    IrBuilder old_irb;
    IrBuilder new_irb;
    IrExecContext exec_context;
    ZigList<IrBasicBlock *> old_bb_queue;
    size_t block_queue_index;
    size_t instruction_index;
    TypeTableEntry *explicit_return_type;
    ZigList<IrInstruction *> implicit_return_type_list;
    IrBasicBlock *const_predecessor_bb;
};

static IrInstruction *ir_gen_node(IrBuilder *irb, AstNode *node, Scope *scope);
static IrInstruction *ir_gen_node_extra(IrBuilder *irb, AstNode *node, Scope *scope,
        LValPurpose lval);
static TypeTableEntry *ir_analyze_instruction(IrAnalyze *ira, IrInstruction *instruction);

ConstExprValue *const_ptr_pointee(ConstExprValue *const_val) {
    assert(const_val->special == ConstValSpecialStatic);
    ConstExprValue *base_ptr = const_val->data.x_ptr.base_ptr;
    size_t index = const_val->data.x_ptr.index;

    if (index == SIZE_MAX) {
        return base_ptr;
    } else {
        assert(index < base_ptr->data.x_array.size);
        return &base_ptr->data.x_array.elements[index];
    }
}

static bool ir_should_inline(IrBuilder *irb) {
    return irb->exec->is_inline;
}

static void ir_instruction_append(IrBasicBlock *basic_block, IrInstruction *instruction) {
    assert(basic_block);
    assert(instruction);
    basic_block->instruction_list.append(instruction);
}

static size_t exec_next_debug_id(IrExecutable *exec) {
    size_t result = exec->next_debug_id;
    exec->next_debug_id += 1;
    return result;
}

static size_t exec_next_mem_slot(IrExecutable *exec) {
    size_t result = exec->mem_slot_count;
    exec->mem_slot_count += 1;
    return result;
}

static FnTableEntry *exec_fn_entry(IrExecutable *exec) {
    return exec->fn_entry;
}

static Buf *exec_c_import_buf(IrExecutable *exec) {
    return exec->c_import_buf;
}

static void ir_link_new_instruction(IrInstruction *new_instruction, IrInstruction *old_instruction) {
    new_instruction->other = old_instruction;
    old_instruction->other = new_instruction;
}

static void ir_link_new_bb(IrBasicBlock *new_bb, IrBasicBlock *old_bb) {
    new_bb->other = old_bb;
    old_bb->other = new_bb;
}

static void ir_ref_bb(IrBasicBlock *bb) {
    bb->ref_count += 1;
}

static void ir_ref_instruction(IrInstruction *instruction) {
    instruction->ref_count += 1;
}

static void ir_ref_var(VariableTableEntry *var) {
    var->ref_count += 1;
}

static IrBasicBlock *ir_create_basic_block(IrBuilder *irb, Scope *scope, const char *name_hint) {
    IrBasicBlock *result = allocate<IrBasicBlock>(1);
    result->scope = scope;
    result->name_hint = name_hint;
    result->debug_id = exec_next_debug_id(irb->exec);
    return result;
}

static IrBasicBlock *ir_build_basic_block(IrBuilder *irb, Scope *scope, const char *name_hint) {
    IrBasicBlock *result = ir_create_basic_block(irb, scope, name_hint);
    irb->exec->basic_block_list.append(result);
    return result;
}

static IrBasicBlock *ir_build_bb_from(IrBuilder *irb, IrBasicBlock *other_bb) {
    IrBasicBlock *new_bb = ir_create_basic_block(irb, other_bb->scope, other_bb->name_hint);
    ir_link_new_bb(new_bb, other_bb);
    return new_bb;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCondBr *) {
    return IrInstructionIdCondBr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionBr *) {
    return IrInstructionIdBr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSwitchBr *) {
    return IrInstructionIdSwitchBr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSwitchVar *) {
    return IrInstructionIdSwitchVar;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSwitchTarget *) {
    return IrInstructionIdSwitchTarget;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionPhi *) {
    return IrInstructionIdPhi;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionUnOp *) {
    return IrInstructionIdUnOp;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionBinOp *) {
    return IrInstructionIdBinOp;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionDeclVar *) {
    return IrInstructionIdDeclVar;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionLoadPtr *) {
    return IrInstructionIdLoadPtr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionStorePtr *) {
    return IrInstructionIdStorePtr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionFieldPtr *) {
    return IrInstructionIdFieldPtr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionStructFieldPtr *) {
    return IrInstructionIdStructFieldPtr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionEnumFieldPtr *) {
    return IrInstructionIdEnumFieldPtr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionElemPtr *) {
    return IrInstructionIdElemPtr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionVarPtr *) {
    return IrInstructionIdVarPtr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCall *) {
    return IrInstructionIdCall;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionConst *) {
    return IrInstructionIdConst;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionReturn *) {
    return IrInstructionIdReturn;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCast *) {
    return IrInstructionIdCast;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionContainerInitList *) {
    return IrInstructionIdContainerInitList;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionContainerInitFields *) {
    return IrInstructionIdContainerInitFields;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionUnreachable *) {
    return IrInstructionIdUnreachable;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionTypeOf *) {
    return IrInstructionIdTypeOf;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionToPtrType *) {
    return IrInstructionIdToPtrType;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionPtrTypeChild *) {
    return IrInstructionIdPtrTypeChild;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSetFnTest *) {
    return IrInstructionIdSetFnTest;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSetFnVisible *) {
    return IrInstructionIdSetFnVisible;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSetDebugSafety *) {
    return IrInstructionIdSetDebugSafety;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionArrayType *) {
    return IrInstructionIdArrayType;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSliceType *) {
    return IrInstructionIdSliceType;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionAsm *) {
    return IrInstructionIdAsm;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCompileVar *) {
    return IrInstructionIdCompileVar;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSizeOf *) {
    return IrInstructionIdSizeOf;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionTestNull *) {
    return IrInstructionIdTestNull;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionUnwrapMaybe *) {
    return IrInstructionIdUnwrapMaybe;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionClz *) {
    return IrInstructionIdClz;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCtz *) {
    return IrInstructionIdCtz;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionEnumTag *) {
    return IrInstructionIdEnumTag;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionStaticEval *) {
    return IrInstructionIdStaticEval;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionImport *) {
    return IrInstructionIdImport;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCImport *) {
    return IrInstructionIdCImport;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCInclude *) {
    return IrInstructionIdCInclude;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCDefine *) {
    return IrInstructionIdCDefine;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCUndef *) {
    return IrInstructionIdCUndef;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionArrayLen *) {
    return IrInstructionIdArrayLen;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionRef *) {
    return IrInstructionIdRef;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionStructInit *) {
    return IrInstructionIdStructInit;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionMinValue *) {
    return IrInstructionIdMinValue;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionMaxValue *) {
    return IrInstructionIdMaxValue;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCompileErr *) {
    return IrInstructionIdCompileErr;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionErrName *) {
    return IrInstructionIdErrName;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionEmbedFile *) {
    return IrInstructionIdEmbedFile;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionCmpxchg *) {
    return IrInstructionIdCmpxchg;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionFence *) {
    return IrInstructionIdFence;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionDivExact *) {
    return IrInstructionIdDivExact;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionTruncate *) {
    return IrInstructionIdTruncate;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionIntType *) {
    return IrInstructionIdIntType;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionBoolNot *) {
    return IrInstructionIdBoolNot;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionAlloca *) {
    return IrInstructionIdAlloca;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionMemset *) {
    return IrInstructionIdMemset;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionMemcpy *) {
    return IrInstructionIdMemcpy;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionSlice *) {
    return IrInstructionIdSlice;
}

static constexpr IrInstructionId ir_instruction_id(IrInstructionMemberCount *) {
    return IrInstructionIdMemberCount;
}

template<typename T>
static T *ir_create_instruction(IrExecutable *exec, Scope *scope, AstNode *source_node) {
    T *special_instruction = allocate<T>(1);
    special_instruction->base.id = ir_instruction_id(special_instruction);
    special_instruction->base.scope = scope;
    special_instruction->base.source_node = source_node;
    special_instruction->base.debug_id = exec_next_debug_id(exec);
    return special_instruction;
}

template<typename T>
static T *ir_build_instruction(IrBuilder *irb, Scope *scope, AstNode *source_node) {
    assert(source_node);
    T *special_instruction = ir_create_instruction<T>(irb->exec, scope, source_node);
    ir_instruction_append(irb->current_basic_block, &special_instruction->base);
    return special_instruction;
}

static IrInstruction *ir_build_cast(IrBuilder *irb, Scope *scope, AstNode *source_node, TypeTableEntry *dest_type,
    IrInstruction *value, CastOp cast_op)
{
    IrInstructionCast *cast_instruction = ir_build_instruction<IrInstructionCast>(irb, scope, source_node);
    cast_instruction->dest_type = dest_type;
    cast_instruction->value = value;
    cast_instruction->cast_op = cast_op;

    ir_ref_instruction(value);

    return &cast_instruction->base;
}

static IrInstruction *ir_build_cond_br(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *condition,
        IrBasicBlock *then_block, IrBasicBlock *else_block, bool is_inline)
{
    IrInstructionCondBr *cond_br_instruction = ir_build_instruction<IrInstructionCondBr>(irb, scope, source_node);
    cond_br_instruction->base.type_entry = irb->codegen->builtin_types.entry_unreachable;
    cond_br_instruction->base.static_value.special = ConstValSpecialStatic;
    cond_br_instruction->condition = condition;
    cond_br_instruction->then_block = then_block;
    cond_br_instruction->else_block = else_block;
    cond_br_instruction->is_inline = is_inline;

    ir_ref_instruction(condition);
    ir_ref_bb(then_block);
    ir_ref_bb(else_block);

    return &cond_br_instruction->base;
}

static IrInstruction *ir_build_cond_br_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrInstruction *condition, IrBasicBlock *then_block, IrBasicBlock *else_block, bool is_inline)
{
    IrInstruction *new_instruction = ir_build_cond_br(irb, old_instruction->scope, old_instruction->source_node,
            condition, then_block, else_block, is_inline);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_return(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *return_value) {
    IrInstructionReturn *return_instruction = ir_build_instruction<IrInstructionReturn>(irb, scope, source_node);
    return_instruction->base.type_entry = irb->codegen->builtin_types.entry_unreachable;
    return_instruction->base.static_value.special = ConstValSpecialStatic;
    return_instruction->value = return_value;

    ir_ref_instruction(return_value);

    return &return_instruction->base;
}

static IrInstruction *ir_build_return_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrInstruction *return_value)
{
    IrInstruction *new_instruction = ir_build_return(irb, old_instruction->scope, old_instruction->source_node, return_value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_create_const(IrBuilder *irb, Scope *scope, AstNode *source_node,
    TypeTableEntry *type_entry, bool depends_on_compile_var)
{
    assert(type_entry);
    IrInstructionConst *const_instruction = ir_create_instruction<IrInstructionConst>(irb->exec, scope, source_node);
    const_instruction->base.type_entry = type_entry;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    const_instruction->base.static_value.depends_on_compile_var = depends_on_compile_var;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_void(IrBuilder *irb, Scope *scope, AstNode *source_node) {
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.type_entry = irb->codegen->builtin_types.entry_void;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_undefined(IrBuilder *irb, Scope *scope, AstNode *source_node) {
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.static_value.special = ConstValSpecialUndef;
    const_instruction->base.type_entry = irb->codegen->builtin_types.entry_undef;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_bignum(IrBuilder *irb, Scope *scope, AstNode *source_node, BigNum *bignum) {
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.type_entry = (bignum->kind == BigNumKindInt) ?
        irb->codegen->builtin_types.entry_num_lit_int : irb->codegen->builtin_types.entry_num_lit_float;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    const_instruction->base.static_value.data.x_bignum = *bignum;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_null(IrBuilder *irb, Scope *scope, AstNode *source_node) {
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.type_entry = irb->codegen->builtin_types.entry_null;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_usize(IrBuilder *irb, Scope *scope, AstNode *source_node, uint64_t value) {
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.type_entry = irb->codegen->builtin_types.entry_usize;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    bignum_init_unsigned(&const_instruction->base.static_value.data.x_bignum, value);
    return &const_instruction->base;
}

static IrInstruction *ir_create_const_type(IrBuilder *irb, Scope *scope, AstNode *source_node,
        TypeTableEntry *type_entry)
{
    IrInstructionConst *const_instruction = ir_create_instruction<IrInstructionConst>(irb->exec, scope, source_node);
    const_instruction->base.type_entry = irb->codegen->builtin_types.entry_type;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    const_instruction->base.static_value.data.x_type = type_entry;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_type(IrBuilder *irb, Scope *scope, AstNode *source_node,
        TypeTableEntry *type_entry)
{
    IrInstruction *instruction = ir_create_const_type(irb, scope, source_node, type_entry);
    ir_instruction_append(irb->current_basic_block, instruction);
    return instruction;
}

static IrInstruction *ir_build_const_fn(IrBuilder *irb, Scope *scope, AstNode *source_node, FnTableEntry *fn_entry) {
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.type_entry = fn_entry->type_entry;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    const_instruction->base.static_value.data.x_fn = fn_entry;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_import(IrBuilder *irb, Scope *scope, AstNode *source_node, ImportTableEntry *import) {
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.type_entry = irb->codegen->builtin_types.entry_namespace;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    const_instruction->base.static_value.data.x_import = import;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_scope(IrBuilder *irb, Scope *parent_scope, AstNode *source_node,
        Scope *target_scope)
{
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, parent_scope, source_node);
    const_instruction->base.type_entry = irb->codegen->builtin_types.entry_block;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    const_instruction->base.static_value.data.x_block = target_scope;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_bool(IrBuilder *irb, Scope *scope, AstNode *source_node, bool value) {
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.type_entry = irb->codegen->builtin_types.entry_bool;
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    const_instruction->base.static_value.data.x_bool = value;
    return &const_instruction->base;
}

static IrInstruction *ir_build_const_bound_fn(IrBuilder *irb, Scope *scope, AstNode *source_node,
    FnTableEntry *fn_entry, IrInstruction *first_arg, bool depends_on_compile_var)
{
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    const_instruction->base.type_entry = get_bound_fn_type(irb->codegen, fn_entry);
    const_instruction->base.static_value.special = ConstValSpecialStatic;
    const_instruction->base.static_value.depends_on_compile_var = depends_on_compile_var;
    const_instruction->base.static_value.data.x_bound_fn.fn = fn_entry;
    const_instruction->base.static_value.data.x_bound_fn.first_arg = first_arg;
    return &const_instruction->base;
}

static IrInstruction *ir_create_const_str_lit(IrBuilder *irb, Scope *scope, AstNode *source_node, Buf *str) {
    IrInstructionConst *const_instruction = ir_create_instruction<IrInstructionConst>(irb->exec, scope, source_node);
    TypeTableEntry *u8_type = irb->codegen->builtin_types.entry_u8;
    TypeTableEntry *type_entry = get_array_type(irb->codegen, u8_type, buf_len(str));
    const_instruction->base.type_entry = type_entry;
    ConstExprValue *const_val = &const_instruction->base.static_value;
    init_const_str_lit(const_val, str);

    return &const_instruction->base;
}
static IrInstruction *ir_build_const_str_lit(IrBuilder *irb, Scope *scope, AstNode *source_node, Buf *str) {
    IrInstruction *instruction = ir_create_const_str_lit(irb, scope, source_node, str);
    ir_instruction_append(irb->current_basic_block, instruction);
    return instruction;
}

static IrInstruction *ir_build_const_c_str_lit(IrBuilder *irb, Scope *scope, AstNode *source_node, Buf *str) {
    // first we build the underlying array
    size_t len_with_null = buf_len(str) + 1;
    ConstExprValue *array_val = allocate<ConstExprValue>(1);
    array_val->special = ConstValSpecialStatic;
    array_val->data.x_array.elements = allocate<ConstExprValue>(len_with_null);
    array_val->data.x_array.size = len_with_null;
    for (size_t i = 0; i < buf_len(str); i += 1) {
        ConstExprValue *this_char = &array_val->data.x_array.elements[i];
        this_char->special = ConstValSpecialStatic;
        bignum_init_unsigned(&this_char->data.x_bignum, buf_ptr(str)[i]);
    }
    ConstExprValue *null_char = &array_val->data.x_array.elements[len_with_null - 1];
    null_char->special = ConstValSpecialStatic;
    bignum_init_unsigned(&null_char->data.x_bignum, 0);

    // then make the pointer point to it
    IrInstructionConst *const_instruction = ir_build_instruction<IrInstructionConst>(irb, scope, source_node);
    TypeTableEntry *u8_type = irb->codegen->builtin_types.entry_u8;
    TypeTableEntry *type_entry = get_pointer_to_type(irb->codegen, u8_type, true);
    const_instruction->base.type_entry = type_entry;
    ConstExprValue *ptr_val = &const_instruction->base.static_value;
    ptr_val->special = ConstValSpecialStatic;
    ptr_val->data.x_ptr.base_ptr = array_val;
    ptr_val->data.x_ptr.index = 0;
    ptr_val->data.x_ptr.special = ConstPtrSpecialCStr;

    return &const_instruction->base;
}

static IrInstruction *ir_build_bin_op(IrBuilder *irb, Scope *scope, AstNode *source_node, IrBinOp op_id,
        IrInstruction *op1, IrInstruction *op2, bool safety_check_on)
{
    IrInstructionBinOp *bin_op_instruction = ir_build_instruction<IrInstructionBinOp>(irb, scope, source_node);
    bin_op_instruction->op_id = op_id;
    bin_op_instruction->op1 = op1;
    bin_op_instruction->op2 = op2;
    bin_op_instruction->safety_check_on = safety_check_on;

    ir_ref_instruction(op1);
    ir_ref_instruction(op2);

    return &bin_op_instruction->base;
}

static IrInstruction *ir_build_bin_op_from(IrBuilder *irb, IrInstruction *old_instruction, IrBinOp op_id,
        IrInstruction *op1, IrInstruction *op2, bool safety_check_on)
{
    IrInstruction *new_instruction = ir_build_bin_op(irb, old_instruction->scope,
            old_instruction->source_node, op_id, op1, op2, safety_check_on);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_var_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node, VariableTableEntry *var) {
    IrInstructionVarPtr *instruction = ir_build_instruction<IrInstructionVarPtr>(irb, scope, source_node);
    instruction->var = var;

    ir_ref_var(var);

    return &instruction->base;
}

static IrInstruction *ir_build_var_ptr_from(IrBuilder *irb, IrInstruction *old_instruction, VariableTableEntry *var) {
    IrInstruction *new_instruction = ir_build_var_ptr(irb, old_instruction->scope, old_instruction->source_node, var);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;

}

static IrInstruction *ir_build_elem_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *array_ptr,
        IrInstruction *elem_index, bool safety_check_on)
{
    IrInstructionElemPtr *instruction = ir_build_instruction<IrInstructionElemPtr>(irb, scope, source_node);
    instruction->array_ptr = array_ptr;
    instruction->elem_index = elem_index;
    instruction->safety_check_on = safety_check_on;

    ir_ref_instruction(array_ptr);
    ir_ref_instruction(elem_index);

    return &instruction->base;
}

static IrInstruction *ir_build_elem_ptr_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrInstruction *array_ptr, IrInstruction *elem_index, bool safety_check_on)
{
    IrInstruction *new_instruction = ir_build_elem_ptr(irb, old_instruction->scope,
            old_instruction->source_node, array_ptr, elem_index, safety_check_on);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_field_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node,
    IrInstruction *container_ptr, Buf *field_name)
{
    IrInstructionFieldPtr *instruction = ir_build_instruction<IrInstructionFieldPtr>(irb, scope, source_node);
    instruction->container_ptr = container_ptr;
    instruction->field_name = field_name;

    ir_ref_instruction(container_ptr);

    return &instruction->base;
}

static IrInstruction *ir_build_struct_field_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node,
    IrInstruction *struct_ptr, TypeStructField *field)
{
    IrInstructionStructFieldPtr *instruction = ir_build_instruction<IrInstructionStructFieldPtr>(irb, scope, source_node);
    instruction->struct_ptr = struct_ptr;
    instruction->field = field;

    ir_ref_instruction(struct_ptr);

    return &instruction->base;
}

static IrInstruction *ir_build_struct_field_ptr_from(IrBuilder *irb, IrInstruction *old_instruction,
    IrInstruction *struct_ptr, TypeStructField *type_struct_field)
{
    IrInstruction *new_instruction = ir_build_struct_field_ptr(irb, old_instruction->scope,
            old_instruction->source_node, struct_ptr, type_struct_field);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_enum_field_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node,
    IrInstruction *enum_ptr, TypeEnumField *field)
{
    IrInstructionEnumFieldPtr *instruction = ir_build_instruction<IrInstructionEnumFieldPtr>(irb, scope, source_node);
    instruction->enum_ptr = enum_ptr;
    instruction->field = field;

    ir_ref_instruction(enum_ptr);

    return &instruction->base;
}

static IrInstruction *ir_build_enum_field_ptr_from(IrBuilder *irb, IrInstruction *old_instruction,
    IrInstruction *enum_ptr, TypeEnumField *type_enum_field)
{
    IrInstruction *new_instruction = ir_build_enum_field_ptr(irb, old_instruction->scope,
            old_instruction->source_node, enum_ptr, type_enum_field);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_call(IrBuilder *irb, Scope *scope, AstNode *source_node,
        FnTableEntry *fn_entry, IrInstruction *fn_ref, size_t arg_count, IrInstruction **args)
{
    IrInstructionCall *call_instruction = ir_build_instruction<IrInstructionCall>(irb, scope, source_node);
    call_instruction->fn_entry = fn_entry;
    call_instruction->fn_ref = fn_ref;
    call_instruction->arg_count = arg_count;
    call_instruction->args = args;

    if (fn_ref)
        ir_ref_instruction(fn_ref);
    for (size_t i = 0; i < arg_count; i += 1)
        ir_ref_instruction(args[i]);

    return &call_instruction->base;
}

static IrInstruction *ir_build_call_from(IrBuilder *irb, IrInstruction *old_instruction,
        FnTableEntry *fn_entry, IrInstruction *fn_ref, size_t arg_count, IrInstruction **args)
{
    IrInstruction *new_instruction = ir_build_call(irb, old_instruction->scope,
            old_instruction->source_node, fn_entry, fn_ref, arg_count, args);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_phi(IrBuilder *irb, Scope *scope, AstNode *source_node,
        size_t incoming_count, IrBasicBlock **incoming_blocks, IrInstruction **incoming_values)
{
    assert(incoming_count != 0);
    assert(incoming_count != SIZE_MAX);

    IrInstructionPhi *phi_instruction = ir_build_instruction<IrInstructionPhi>(irb, scope, source_node);
    phi_instruction->incoming_count = incoming_count;
    phi_instruction->incoming_blocks = incoming_blocks;
    phi_instruction->incoming_values = incoming_values;

    for (size_t i = 0; i < incoming_count; i += 1) {
        ir_ref_bb(incoming_blocks[i]);
        ir_ref_instruction(incoming_values[i]);
    }

    return &phi_instruction->base;
}

static IrInstruction *ir_build_phi_from(IrBuilder *irb, IrInstruction *old_instruction,
        size_t incoming_count, IrBasicBlock **incoming_blocks, IrInstruction **incoming_values)
{
    IrInstruction *new_instruction = ir_build_phi(irb, old_instruction->scope, old_instruction->source_node,
            incoming_count, incoming_blocks, incoming_values);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_create_br(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrBasicBlock *dest_block, bool is_inline)
{
    IrInstructionBr *br_instruction = ir_create_instruction<IrInstructionBr>(irb->exec, scope, source_node);
    br_instruction->base.type_entry = irb->codegen->builtin_types.entry_unreachable;
    br_instruction->base.static_value.special = ConstValSpecialStatic;
    br_instruction->dest_block = dest_block;
    br_instruction->is_inline = is_inline;

    ir_ref_bb(dest_block);

    return &br_instruction->base;
}

static IrInstruction *ir_build_br(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrBasicBlock *dest_block, bool is_inline)
{
    IrInstruction *instruction = ir_create_br(irb, scope, source_node, dest_block, is_inline);
    ir_instruction_append(irb->current_basic_block, instruction);
    return instruction;
}

static IrInstruction *ir_build_br_from(IrBuilder *irb, IrInstruction *old_instruction, IrBasicBlock *dest_block) {
    IrInstruction *new_instruction = ir_build_br(irb, old_instruction->scope,
            old_instruction->source_node, dest_block, false);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_un_op(IrBuilder *irb, Scope *scope, AstNode *source_node, IrUnOp op_id, IrInstruction *value) {
    IrInstructionUnOp *br_instruction = ir_build_instruction<IrInstructionUnOp>(irb, scope, source_node);
    br_instruction->op_id = op_id;
    br_instruction->value = value;

    ir_ref_instruction(value);

    return &br_instruction->base;
}

static IrInstruction *ir_build_un_op_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrUnOp op_id, IrInstruction *value)
{
    IrInstruction *new_instruction = ir_build_un_op(irb, old_instruction->scope,
            old_instruction->source_node, op_id, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_container_init_list(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrInstruction *container_type, size_t item_count, IrInstruction **items)
{
    IrInstructionContainerInitList *container_init_list_instruction =
        ir_build_instruction<IrInstructionContainerInitList>(irb, scope, source_node);
    container_init_list_instruction->container_type = container_type;
    container_init_list_instruction->item_count = item_count;
    container_init_list_instruction->items = items;

    ir_ref_instruction(container_type);
    for (size_t i = 0; i < item_count; i += 1) {
        ir_ref_instruction(items[i]);
    }

    return &container_init_list_instruction->base;
}

static IrInstruction *ir_build_container_init_list_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrInstruction *container_type, size_t item_count, IrInstruction **items)
{
    IrInstruction *new_instruction = ir_build_container_init_list(irb, old_instruction->scope,
            old_instruction->source_node, container_type, item_count, items);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_container_init_fields(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrInstruction *container_type, size_t field_count, IrInstructionContainerInitFieldsField *fields)
{
    IrInstructionContainerInitFields *container_init_fields_instruction =
        ir_build_instruction<IrInstructionContainerInitFields>(irb, scope, source_node);
    container_init_fields_instruction->container_type = container_type;
    container_init_fields_instruction->field_count = field_count;
    container_init_fields_instruction->fields = fields;

    ir_ref_instruction(container_type);
    for (size_t i = 0; i < field_count; i += 1) {
        ir_ref_instruction(fields[i].value);
    }

    return &container_init_fields_instruction->base;
}

static IrInstruction *ir_build_struct_init(IrBuilder *irb, Scope *scope, AstNode *source_node,
        TypeTableEntry *struct_type, size_t field_count, IrInstructionStructInitField *fields)
{
    IrInstructionStructInit *struct_init_instruction = ir_build_instruction<IrInstructionStructInit>(irb, scope, source_node);
    struct_init_instruction->struct_type = struct_type;
    struct_init_instruction->field_count = field_count;
    struct_init_instruction->fields = fields;

    for (size_t i = 0; i < field_count; i += 1)
        ir_ref_instruction(fields[i].value);

    return &struct_init_instruction->base;
}

static IrInstruction *ir_build_struct_init_from(IrBuilder *irb, IrInstruction *old_instruction,
        TypeTableEntry *struct_type, size_t field_count, IrInstructionStructInitField *fields)
{
    IrInstruction *new_instruction = ir_build_struct_init(irb, old_instruction->scope,
            old_instruction->source_node, struct_type, field_count, fields);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_unreachable(IrBuilder *irb, Scope *scope, AstNode *source_node) {
    IrInstructionUnreachable *unreachable_instruction =
        ir_build_instruction<IrInstructionUnreachable>(irb, scope, source_node);
    unreachable_instruction->base.static_value.special = ConstValSpecialStatic;
    unreachable_instruction->base.type_entry = irb->codegen->builtin_types.entry_unreachable;
    return &unreachable_instruction->base;
}

static IrInstruction *ir_build_unreachable_from(IrBuilder *irb, IrInstruction *old_instruction) {
    IrInstruction *new_instruction = ir_build_unreachable(irb, old_instruction->scope, old_instruction->source_node);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_store_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrInstruction *ptr, IrInstruction *value)
{
    IrInstructionStorePtr *instruction = ir_build_instruction<IrInstructionStorePtr>(irb, scope, source_node);
    instruction->base.static_value.special = ConstValSpecialStatic;
    instruction->base.type_entry = irb->codegen->builtin_types.entry_void;
    instruction->ptr = ptr;
    instruction->value = value;

    ir_ref_instruction(ptr);
    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_store_ptr_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrInstruction *ptr, IrInstruction *value)
{
    IrInstruction *new_instruction = ir_build_store_ptr(irb, old_instruction->scope,
            old_instruction->source_node, ptr, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_var_decl(IrBuilder *irb, Scope *scope, AstNode *source_node,
        VariableTableEntry *var, IrInstruction *var_type, IrInstruction *init_value)
{
    IrInstructionDeclVar *decl_var_instruction = ir_build_instruction<IrInstructionDeclVar>(irb, scope, source_node);
    decl_var_instruction->base.static_value.special = ConstValSpecialStatic;
    decl_var_instruction->base.type_entry = irb->codegen->builtin_types.entry_void;
    decl_var_instruction->var = var;
    decl_var_instruction->var_type = var_type;
    decl_var_instruction->init_value = init_value;

    if (var_type) ir_ref_instruction(var_type);
    ir_ref_instruction(init_value);

    return &decl_var_instruction->base;
}

static IrInstruction *ir_build_var_decl_from(IrBuilder *irb, IrInstruction *old_instruction,
        VariableTableEntry *var, IrInstruction *var_type, IrInstruction *init_value)
{
    IrInstruction *new_instruction = ir_build_var_decl(irb, old_instruction->scope,
            old_instruction->source_node, var, var_type, init_value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_load_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *ptr) {
    IrInstructionLoadPtr *instruction = ir_build_instruction<IrInstructionLoadPtr>(irb, scope, source_node);
    instruction->ptr = ptr;

    ir_ref_instruction(ptr);

    return &instruction->base;
}

static IrInstruction *ir_build_load_ptr_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *ptr) {
    IrInstruction *new_instruction = ir_build_load_ptr(irb, old_instruction->scope,
            old_instruction->source_node, ptr);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_typeof(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionTypeOf *instruction = ir_build_instruction<IrInstructionTypeOf>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_to_ptr_type(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionToPtrType *instruction = ir_build_instruction<IrInstructionToPtrType>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_ptr_type_child(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionPtrTypeChild *instruction = ir_build_instruction<IrInstructionPtrTypeChild>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_set_fn_test(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrInstruction *fn_value)
{
    IrInstructionSetFnTest *instruction = ir_build_instruction<IrInstructionSetFnTest>(irb, scope, source_node);
    instruction->fn_value = fn_value;

    ir_ref_instruction(fn_value);

    return &instruction->base;
}

static IrInstruction *ir_build_set_fn_visible(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *fn_value,
        IrInstruction *is_visible)
{
    IrInstructionSetFnVisible *instruction = ir_build_instruction<IrInstructionSetFnVisible>(irb, scope, source_node);
    instruction->fn_value = fn_value;
    instruction->is_visible = is_visible;

    ir_ref_instruction(fn_value);
    ir_ref_instruction(is_visible);

    return &instruction->base;
}

static IrInstruction *ir_build_set_debug_safety(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrInstruction *scope_value, IrInstruction *debug_safety_on)
{
    IrInstructionSetDebugSafety *instruction = ir_build_instruction<IrInstructionSetDebugSafety>(irb, scope, source_node);
    instruction->scope_value = scope_value;
    instruction->debug_safety_on = debug_safety_on;

    ir_ref_instruction(scope_value);
    ir_ref_instruction(debug_safety_on);

    return &instruction->base;
}

static IrInstruction *ir_build_array_type(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *size,
        IrInstruction *child_type)
{
    IrInstructionArrayType *instruction = ir_build_instruction<IrInstructionArrayType>(irb, scope, source_node);
    instruction->size = size;
    instruction->child_type = child_type;

    ir_ref_instruction(size);
    ir_ref_instruction(child_type);

    return &instruction->base;
}

static IrInstruction *ir_build_slice_type(IrBuilder *irb, Scope *scope, AstNode *source_node, bool is_const,
        IrInstruction *child_type)
{
    IrInstructionSliceType *instruction = ir_build_instruction<IrInstructionSliceType>(irb, scope, source_node);
    instruction->is_const = is_const;
    instruction->child_type = child_type;

    ir_ref_instruction(child_type);

    return &instruction->base;
}

static IrInstruction *ir_build_asm(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction **input_list,
        IrInstruction **output_types, VariableTableEntry **output_vars, size_t return_count, bool has_side_effects)
{
    IrInstructionAsm *instruction = ir_build_instruction<IrInstructionAsm>(irb, scope, source_node);
    instruction->input_list = input_list;
    instruction->output_types = output_types;
    instruction->output_vars = output_vars;
    instruction->return_count = return_count;
    instruction->has_side_effects = has_side_effects;

    assert(source_node->type == NodeTypeAsmExpr);
    for (size_t i = 0; i < source_node->data.asm_expr.output_list.length; i += 1) {
        IrInstruction *output_type = output_types[i];
        if (output_type) ir_ref_instruction(output_type);
    }

    for (size_t i = 0; i < source_node->data.asm_expr.input_list.length; i += 1) {
        IrInstruction *input_value = input_list[i];
        ir_ref_instruction(input_value);
    }

    return &instruction->base;
}

static IrInstruction *ir_build_asm_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction **input_list,
        IrInstruction **output_types, VariableTableEntry **output_vars, size_t return_count, bool has_side_effects)
{
    IrInstruction *new_instruction = ir_build_asm(irb, old_instruction->scope,
            old_instruction->source_node, input_list, output_types, output_vars, return_count, has_side_effects);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_compile_var(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *name) {
    IrInstructionCompileVar *instruction = ir_build_instruction<IrInstructionCompileVar>(irb, scope, source_node);
    instruction->name = name;

    ir_ref_instruction(name);

    return &instruction->base;
}

static IrInstruction *ir_build_size_of(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *type_value) {
    IrInstructionSizeOf *instruction = ir_build_instruction<IrInstructionSizeOf>(irb, scope, source_node);
    instruction->type_value = type_value;

    ir_ref_instruction(type_value);

    return &instruction->base;
}

static IrInstruction *ir_build_test_null(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionTestNull *instruction = ir_build_instruction<IrInstructionTestNull>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_test_null_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrInstruction *value)
{
    IrInstruction *new_instruction = ir_build_test_null(irb, old_instruction->scope,
            old_instruction->source_node, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_unwrap_maybe(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value,
        bool safety_check_on)
{
    IrInstructionUnwrapMaybe *instruction = ir_build_instruction<IrInstructionUnwrapMaybe>(irb, scope, source_node);
    instruction->value = value;
    instruction->safety_check_on = safety_check_on;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_unwrap_maybe_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrInstruction *value, bool safety_check_on)
{
    IrInstruction *new_instruction = ir_build_unwrap_maybe(irb, old_instruction->scope, old_instruction->source_node,
            value, safety_check_on);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_clz(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionClz *instruction = ir_build_instruction<IrInstructionClz>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_clz_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *value) {
    IrInstruction *new_instruction = ir_build_clz(irb, old_instruction->scope, old_instruction->source_node, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_ctz(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionCtz *instruction = ir_build_instruction<IrInstructionCtz>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_ctz_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *value) {
    IrInstruction *new_instruction = ir_build_ctz(irb, old_instruction->scope, old_instruction->source_node, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_switch_br(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *target_value,
        IrBasicBlock *else_block, size_t case_count, IrInstructionSwitchBrCase *cases, bool is_inline)
{
    IrInstructionSwitchBr *instruction = ir_build_instruction<IrInstructionSwitchBr>(irb, scope, source_node);
    instruction->base.type_entry = irb->codegen->builtin_types.entry_unreachable;
    instruction->base.static_value.special = ConstValSpecialStatic;
    instruction->target_value = target_value;
    instruction->else_block = else_block;
    instruction->case_count = case_count;
    instruction->cases = cases;
    instruction->is_inline = is_inline;

    ir_ref_instruction(target_value);
    ir_ref_bb(else_block);

    for (size_t i = 0; i < case_count; i += 1) {
        ir_ref_instruction(cases[i].value);
        ir_ref_bb(cases[i].block);
    }

    return &instruction->base;
}

static IrInstruction *ir_build_switch_br_from(IrBuilder *irb, IrInstruction *old_instruction,
        IrInstruction *target_value, IrBasicBlock *else_block, size_t case_count,
        IrInstructionSwitchBrCase *cases, bool is_inline)
{
    IrInstruction *new_instruction = ir_build_switch_br(irb, old_instruction->scope, old_instruction->source_node,
            target_value, else_block, case_count, cases, is_inline);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_switch_target(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrInstruction *target_value_ptr)
{
    IrInstructionSwitchTarget *instruction = ir_build_instruction<IrInstructionSwitchTarget>(irb, scope, source_node);
    instruction->target_value_ptr = target_value_ptr;

    ir_ref_instruction(target_value_ptr);

    return &instruction->base;
}

static IrInstruction *ir_build_switch_var(IrBuilder *irb, Scope *scope, AstNode *source_node,
        IrInstruction *target_value_ptr, IrInstruction *prong_value)
{
    IrInstructionSwitchVar *instruction = ir_build_instruction<IrInstructionSwitchVar>(irb, scope, source_node);
    instruction->target_value_ptr = target_value_ptr;
    instruction->prong_value = prong_value;

    ir_ref_instruction(target_value_ptr);
    ir_ref_instruction(prong_value);

    return &instruction->base;
}

static IrInstruction *ir_build_enum_tag(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionEnumTag *instruction = ir_build_instruction<IrInstructionEnumTag>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_enum_tag_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *value) {
    IrInstruction *new_instruction = ir_build_enum_tag(irb, old_instruction->scope,
            old_instruction->source_node, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_static_eval(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionStaticEval *instruction = ir_build_instruction<IrInstructionStaticEval>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_import(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *name) {
    IrInstructionImport *instruction = ir_build_instruction<IrInstructionImport>(irb, scope, source_node);
    instruction->name = name;

    ir_ref_instruction(name);

    return &instruction->base;
}

static IrInstruction *ir_build_array_len(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *array_value) {
    IrInstructionArrayLen *instruction = ir_build_instruction<IrInstructionArrayLen>(irb, scope, source_node);
    instruction->array_value = array_value;

    ir_ref_instruction(array_value);

    return &instruction->base;
}

static IrInstruction *ir_build_ref(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionRef *instruction = ir_build_instruction<IrInstructionRef>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_ref_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *value) {
    IrInstruction *new_instruction = ir_build_ref(irb, old_instruction->scope, old_instruction->source_node, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_min_value(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionMinValue *instruction = ir_build_instruction<IrInstructionMinValue>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_max_value(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionMaxValue *instruction = ir_build_instruction<IrInstructionMaxValue>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_compile_err(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *msg) {
    IrInstructionCompileErr *instruction = ir_build_instruction<IrInstructionCompileErr>(irb, scope, source_node);
    instruction->msg = msg;

    ir_ref_instruction(msg);

    return &instruction->base;
}

static IrInstruction *ir_build_err_name(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionErrName *instruction = ir_build_instruction<IrInstructionErrName>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_err_name_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *value) {
    IrInstruction *new_instruction = ir_build_err_name(irb, old_instruction->scope,
            old_instruction->source_node, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_c_import(IrBuilder *irb, Scope *scope, AstNode *source_node) {
    IrInstructionCImport *instruction = ir_build_instruction<IrInstructionCImport>(irb, scope, source_node);
    return &instruction->base;
}

static IrInstruction *ir_build_c_include(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *name) {
    IrInstructionCInclude *instruction = ir_build_instruction<IrInstructionCInclude>(irb, scope, source_node);
    instruction->name = name;

    ir_ref_instruction(name);

    return &instruction->base;
}

static IrInstruction *ir_build_c_define(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *name, IrInstruction *value) {
    IrInstructionCDefine *instruction = ir_build_instruction<IrInstructionCDefine>(irb, scope, source_node);
    instruction->name = name;
    instruction->value = value;

    ir_ref_instruction(name);
    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_c_undef(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *name) {
    IrInstructionCUndef *instruction = ir_build_instruction<IrInstructionCUndef>(irb, scope, source_node);
    instruction->name = name;

    ir_ref_instruction(name);

    return &instruction->base;
}

static IrInstruction *ir_build_embed_file(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *name) {
    IrInstructionEmbedFile *instruction = ir_build_instruction<IrInstructionEmbedFile>(irb, scope, source_node);
    instruction->name = name;

    ir_ref_instruction(name);

    return &instruction->base;
}

static IrInstruction *ir_build_cmpxchg(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *ptr,
    IrInstruction *cmp_value, IrInstruction *new_value, IrInstruction *success_order_value, IrInstruction *failure_order_value,
    AtomicOrder success_order, AtomicOrder failure_order)
{
    IrInstructionCmpxchg *instruction = ir_build_instruction<IrInstructionCmpxchg>(irb, scope, source_node);
    instruction->ptr = ptr;
    instruction->cmp_value = cmp_value;
    instruction->new_value = new_value;
    instruction->success_order_value = success_order_value;
    instruction->failure_order_value = failure_order_value;
    instruction->success_order = success_order;
    instruction->failure_order = failure_order;

    ir_ref_instruction(ptr);
    ir_ref_instruction(cmp_value);
    ir_ref_instruction(new_value);
    ir_ref_instruction(success_order_value);
    ir_ref_instruction(failure_order_value);

    return &instruction->base;
}

static IrInstruction *ir_build_cmpxchg_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *ptr,
    IrInstruction *cmp_value, IrInstruction *new_value, IrInstruction *success_order_value, IrInstruction *failure_order_value,
    AtomicOrder success_order, AtomicOrder failure_order)
{
    IrInstruction *new_instruction = ir_build_cmpxchg(irb, old_instruction->scope, old_instruction->source_node,
        ptr, cmp_value, new_value, success_order_value, failure_order_value, success_order, failure_order);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_fence(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *order_value, AtomicOrder order) {
    IrInstructionFence *instruction = ir_build_instruction<IrInstructionFence>(irb, scope, source_node);
    instruction->order_value = order_value;
    instruction->order = order;

    ir_ref_instruction(order_value);

    return &instruction->base;
}

static IrInstruction *ir_build_fence_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *order_value, AtomicOrder order) {
    IrInstruction *new_instruction = ir_build_fence(irb, old_instruction->scope, old_instruction->source_node, order_value, order);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_div_exact(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *op1, IrInstruction *op2) {
    IrInstructionDivExact *instruction = ir_build_instruction<IrInstructionDivExact>(irb, scope, source_node);
    instruction->op1 = op1;
    instruction->op2 = op2;

    ir_ref_instruction(op1);
    ir_ref_instruction(op2);

    return &instruction->base;
}

static IrInstruction *ir_build_div_exact_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *op1, IrInstruction *op2) {
    IrInstruction *new_instruction = ir_build_div_exact(irb, old_instruction->scope, old_instruction->source_node, op1, op2);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_truncate(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *dest_type, IrInstruction *target) {
    IrInstructionTruncate *instruction = ir_build_instruction<IrInstructionTruncate>(irb, scope, source_node);
    instruction->dest_type = dest_type;
    instruction->target = target;

    ir_ref_instruction(dest_type);
    ir_ref_instruction(target);

    return &instruction->base;
}

static IrInstruction *ir_build_truncate_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *dest_type, IrInstruction *target) {
    IrInstruction *new_instruction = ir_build_truncate(irb, old_instruction->scope, old_instruction->source_node, dest_type, target);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_int_type(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *is_signed, IrInstruction *bit_count) {
    IrInstructionIntType *instruction = ir_build_instruction<IrInstructionIntType>(irb, scope, source_node);
    instruction->is_signed = is_signed;
    instruction->bit_count = bit_count;

    ir_ref_instruction(is_signed);
    ir_ref_instruction(bit_count);

    return &instruction->base;
}

static IrInstruction *ir_build_bool_not(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *value) {
    IrInstructionBoolNot *instruction = ir_build_instruction<IrInstructionBoolNot>(irb, scope, source_node);
    instruction->value = value;

    ir_ref_instruction(value);

    return &instruction->base;
}

static IrInstruction *ir_build_bool_not_from(IrBuilder *irb, IrInstruction *old_instruction, IrInstruction *value) {
    IrInstruction *new_instruction = ir_build_bool_not(irb, old_instruction->scope, old_instruction->source_node, value);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_alloca(IrBuilder *irb, Scope *scope, AstNode *source_node,
    IrInstruction *type_value, IrInstruction *count)
{
    IrInstructionAlloca *instruction = ir_build_instruction<IrInstructionAlloca>(irb, scope, source_node);
    instruction->type_value = type_value;
    instruction->count = count;

    ir_ref_instruction(type_value);
    ir_ref_instruction(count);

    return &instruction->base;
}

static IrInstruction *ir_build_alloca_from(IrBuilder *irb, IrInstruction *old_instruction,
    IrInstruction *type_value, IrInstruction *count)
{
    IrInstruction *new_instruction = ir_build_alloca(irb, old_instruction->scope, old_instruction->source_node, type_value, count);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_memset(IrBuilder *irb, Scope *scope, AstNode *source_node,
    IrInstruction *dest_ptr, IrInstruction *byte, IrInstruction *count)
{
    IrInstructionMemset *instruction = ir_build_instruction<IrInstructionMemset>(irb, scope, source_node);
    instruction->dest_ptr = dest_ptr;
    instruction->byte = byte;
    instruction->count = count;

    ir_ref_instruction(dest_ptr);
    ir_ref_instruction(byte);
    ir_ref_instruction(count);

    return &instruction->base;
}

static IrInstruction *ir_build_memset_from(IrBuilder *irb, IrInstruction *old_instruction,
    IrInstruction *dest_ptr, IrInstruction *byte, IrInstruction *count)
{
    IrInstruction *new_instruction = ir_build_memset(irb, old_instruction->scope, old_instruction->source_node, dest_ptr, byte, count);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_memcpy(IrBuilder *irb, Scope *scope, AstNode *source_node,
    IrInstruction *dest_ptr, IrInstruction *src_ptr, IrInstruction *count)
{
    IrInstructionMemcpy *instruction = ir_build_instruction<IrInstructionMemcpy>(irb, scope, source_node);
    instruction->dest_ptr = dest_ptr;
    instruction->src_ptr = src_ptr;
    instruction->count = count;

    ir_ref_instruction(dest_ptr);
    ir_ref_instruction(src_ptr);
    ir_ref_instruction(count);

    return &instruction->base;
}

static IrInstruction *ir_build_memcpy_from(IrBuilder *irb, IrInstruction *old_instruction,
    IrInstruction *dest_ptr, IrInstruction *src_ptr, IrInstruction *count)
{
    IrInstruction *new_instruction = ir_build_memcpy(irb, old_instruction->scope, old_instruction->source_node, dest_ptr, src_ptr, count);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_slice(IrBuilder *irb, Scope *scope, AstNode *source_node,
    IrInstruction *ptr, IrInstruction *start, IrInstruction *end, bool is_const)
{
    IrInstructionSlice *instruction = ir_build_instruction<IrInstructionSlice>(irb, scope, source_node);
    instruction->ptr = ptr;
    instruction->start = start;
    instruction->end = end;
    instruction->is_const = is_const;

    ir_ref_instruction(ptr);
    ir_ref_instruction(start);
    if (end) ir_ref_instruction(end);

    return &instruction->base;
}

static IrInstruction *ir_build_slice_from(IrBuilder *irb, IrInstruction *old_instruction,
    IrInstruction *ptr, IrInstruction *start, IrInstruction *end, bool is_const)
{
    IrInstruction *new_instruction = ir_build_slice(irb, old_instruction->scope, old_instruction->source_node, ptr, start, end, is_const);
    ir_link_new_instruction(new_instruction, old_instruction);
    return new_instruction;
}

static IrInstruction *ir_build_member_count(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *container) {
    IrInstructionMemberCount *instruction = ir_build_instruction<IrInstructionMemberCount>(irb, scope, source_node);
    instruction->container = container;

    ir_ref_instruction(container);

    return &instruction->base;
}

static void ir_gen_defers_for_block(IrBuilder *irb, Scope *inner_scope, Scope *outer_scope,
        bool gen_error_defers, bool gen_maybe_defers)
{
    while (inner_scope != outer_scope) {
        assert(inner_scope);
        if (inner_scope->id == ScopeIdDefer) {
            AstNode *defer_node = inner_scope->source_node;
            assert(defer_node->type == NodeTypeDefer);
            ReturnKind defer_kind = defer_node->data.defer.kind;
            if (defer_kind == ReturnKindUnconditional ||
                (gen_error_defers && defer_kind == ReturnKindError) ||
                (gen_maybe_defers && defer_kind == ReturnKindMaybe))
            {
                AstNode *defer_expr_node = defer_node->data.defer.expr;
                ir_gen_node(irb, defer_expr_node, defer_node->data.defer.parent_scope);
            }

        }
        inner_scope = inner_scope->parent;
    }
}

static IrInstruction *ir_gen_return(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeReturnExpr);

    FnTableEntry *fn_entry = exec_fn_entry(irb->exec);
    if (!fn_entry) {
        add_node_error(irb->codegen, node, buf_sprintf("return expression outside function definition"));
        return irb->codegen->invalid_instruction;
    }

    AstNode *expr_node = node->data.return_expr.expr;
    switch (node->data.return_expr.kind) {
        case ReturnKindUnconditional:
            {
                IrInstruction *return_value;
                if (expr_node) {
                    return_value = ir_gen_node(irb, expr_node, scope);
                } else {
                    return_value = ir_build_const_void(irb, scope, node);
                }

                Scope *outer_scope = fn_entry->child_scope;
                ir_gen_defers_for_block(irb, scope, outer_scope, false, false);
                return ir_build_return(irb, scope, node, return_value);
            }
        case ReturnKindError:
            zig_panic("TODO gen IR for %%return");
        case ReturnKindMaybe:
            zig_panic("TODO gen IR for ?return");
    }
    zig_unreachable();
}

static void ir_set_cursor_at_end(IrBuilder *irb, IrBasicBlock *basic_block) {
    assert(basic_block);

    irb->current_basic_block = basic_block;
}

static VariableTableEntry *create_local_var(CodeGen *codegen, AstNode *node, Scope *parent_scope,
        Buf *name, bool src_is_const, bool gen_is_const, bool is_shadowable, bool is_inline)
{
    VariableTableEntry *variable_entry = allocate<VariableTableEntry>(1);
    variable_entry->parent_scope = parent_scope;
    variable_entry->shadowable = is_shadowable;
    variable_entry->mem_slot_index = SIZE_MAX;
    variable_entry->is_inline = is_inline;
    variable_entry->src_arg_index = SIZE_MAX;

    if (name) {
        buf_init_from_buf(&variable_entry->name, name);

        VariableTableEntry *existing_var = find_variable(codegen, parent_scope, name);
        if (existing_var && !existing_var->shadowable) {
            ErrorMsg *msg = add_node_error(codegen, node,
                    buf_sprintf("redeclaration of variable '%s'", buf_ptr(name)));
            add_error_note(codegen, msg, existing_var->decl_node, buf_sprintf("previous declaration is here"));
            variable_entry->type = codegen->builtin_types.entry_invalid;
        } else {
            auto primitive_table_entry = codegen->primitive_type_table.maybe_get(name);
            if (primitive_table_entry) {
                TypeTableEntry *type = primitive_table_entry->value;
                add_node_error(codegen, node,
                        buf_sprintf("variable shadows type '%s'", buf_ptr(&type->name)));
                variable_entry->type = codegen->builtin_types.entry_invalid;
            } else {
                Tld *tld = find_decl(parent_scope, name);
                if (tld && tld->id != TldIdVar) {
                    ErrorMsg *msg = add_node_error(codegen, node,
                            buf_sprintf("redefinition of '%s'", buf_ptr(name)));
                    add_error_note(codegen, msg, tld->source_node, buf_sprintf("previous definition is here"));
                    variable_entry->type = codegen->builtin_types.entry_invalid;
                }
            }
        }

    } else {
        assert(is_shadowable);
        // TODO make this name not actually be in scope. user should be able to make a variable called "_anon"
        // might already be solved, let's just make sure it has test coverage
        // maybe we put a prefix on this so the debug info doesn't clobber user debug info for same named variables
        buf_init_from_str(&variable_entry->name, "_anon");
    }

    variable_entry->src_is_const = src_is_const;
    variable_entry->gen_is_const = gen_is_const;
    variable_entry->decl_node = node;
    variable_entry->child_scope = create_var_scope(node, parent_scope, variable_entry);

    return variable_entry;
}

// Set name to nullptr to make the variable anonymous (not visible to programmer).
// After you call this function var->child_scope has the variable in scope
static VariableTableEntry *ir_create_var(IrBuilder *irb, AstNode *node, Scope *scope, Buf *name,
        bool src_is_const, bool gen_is_const, bool is_shadowable, bool is_inline)
{
    VariableTableEntry *var = create_local_var(irb->codegen, node, scope, name,
            src_is_const, gen_is_const, is_shadowable, is_inline);
    if (is_inline || gen_is_const)
        var->mem_slot_index = exec_next_mem_slot(irb->exec);
    assert(var->child_scope);
    return var;
}

static IrInstruction *ir_gen_block(IrBuilder *irb, Scope *parent_scope, AstNode *block_node) {
    assert(block_node->type == NodeTypeBlock);

    Scope *outer_block_scope = create_block_scope(block_node, parent_scope);
    Scope *child_scope = outer_block_scope;

    IrInstruction *return_value = nullptr;
    for (size_t i = 0; i < block_node->data.block.statements.length; i += 1) {
        AstNode *statement_node = block_node->data.block.statements.at(i);
        return_value = ir_gen_node(irb, statement_node, child_scope);
        if (statement_node->type == NodeTypeDefer && return_value != irb->codegen->invalid_instruction) {
            // defer starts a new scope
            child_scope = statement_node->data.defer.child_scope;
            assert(child_scope);
        } else if (return_value->id == IrInstructionIdDeclVar) {
            // variable declarations start a new scope
            IrInstructionDeclVar *decl_var_instruction = (IrInstructionDeclVar *)return_value;
            child_scope = decl_var_instruction->var->child_scope;
        }
    }

    if (!return_value)
        return_value = ir_build_const_void(irb, child_scope, block_node);

    ir_gen_defers_for_block(irb, child_scope, outer_block_scope, false, false);

    return return_value;
}

static IrInstruction *ir_gen_bin_op_id(IrBuilder *irb, Scope *scope, AstNode *node, IrBinOp op_id) {
    IrInstruction *op1 = ir_gen_node(irb, node->data.bin_op_expr.op1, scope);
    IrInstruction *op2 = ir_gen_node(irb, node->data.bin_op_expr.op2, scope);
    return ir_build_bin_op(irb, scope, node, op_id, op1, op2, true);
}

static IrInstruction *ir_gen_assign(IrBuilder *irb, Scope *scope, AstNode *node) {
    IrInstruction *lvalue = ir_gen_node_extra(irb, node->data.bin_op_expr.op1, scope, LValPurposeAssign);
    if (lvalue == irb->codegen->invalid_instruction)
        return lvalue;

    IrInstruction *rvalue = ir_gen_node(irb, node->data.bin_op_expr.op2, scope);
    if (rvalue == irb->codegen->invalid_instruction)
        return rvalue;

    ir_build_store_ptr(irb, scope, node, lvalue, rvalue);
    return ir_build_const_void(irb, scope, node);
}

static IrInstruction *ir_gen_assign_op(IrBuilder *irb, Scope *scope, AstNode *node, IrBinOp op_id) {
    IrInstruction *lvalue = ir_gen_node_extra(irb, node->data.bin_op_expr.op1, scope, LValPurposeAssign);
    if (lvalue == irb->codegen->invalid_instruction)
        return lvalue;
    IrInstruction *op1 = ir_build_load_ptr(irb, scope, node->data.bin_op_expr.op1, lvalue);
    IrInstruction *op2 = ir_gen_node(irb, node->data.bin_op_expr.op2, scope);
    if (op2 == irb->codegen->invalid_instruction)
        return op2;
    IrInstruction *result = ir_build_bin_op(irb, scope, node, op_id, op1, op2, true);
    ir_build_store_ptr(irb, scope, node, lvalue, result);
    return ir_build_const_void(irb, scope, node);
}

static IrInstruction *ir_gen_bool_or(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeBinOpExpr);

    bool is_inline = ir_should_inline(irb);

    IrInstruction *val1 = ir_gen_node(irb, node->data.bin_op_expr.op1, scope);
    if (val1 == irb->codegen->invalid_instruction)
        return irb->codegen->invalid_instruction;
    IrBasicBlock *post_val1_block = irb->current_basic_block;

    // block for when val1 == false
    IrBasicBlock *false_block = ir_build_basic_block(irb, scope, "BoolOrFalse");
    // block for when val1 == true (don't even evaluate the second part)
    IrBasicBlock *true_block = ir_build_basic_block(irb, scope, "BoolOrTrue");

    ir_build_cond_br(irb, scope, node, val1, true_block, false_block, is_inline);

    ir_set_cursor_at_end(irb, false_block);
    IrInstruction *val2 = ir_gen_node(irb, node->data.bin_op_expr.op2, scope);
    if (val2 == irb->codegen->invalid_instruction)
        return irb->codegen->invalid_instruction;
    IrBasicBlock *post_val2_block = irb->current_basic_block;

    ir_build_br(irb, scope, node, true_block, is_inline);

    ir_set_cursor_at_end(irb, true_block);

    IrInstruction **incoming_values = allocate<IrInstruction *>(2);
    incoming_values[0] = val1;
    incoming_values[1] = val2;
    IrBasicBlock **incoming_blocks = allocate<IrBasicBlock *>(2);
    incoming_blocks[0] = post_val1_block;
    incoming_blocks[1] = post_val2_block;

    return ir_build_phi(irb, scope, node, 2, incoming_blocks, incoming_values);
}

static IrInstruction *ir_gen_bool_and(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeBinOpExpr);

    bool is_inline = ir_should_inline(irb);

    IrInstruction *val1 = ir_gen_node(irb, node->data.bin_op_expr.op1, scope);
    if (val1 == irb->codegen->invalid_instruction)
        return irb->codegen->invalid_instruction;
    IrBasicBlock *post_val1_block = irb->current_basic_block;

    // block for when val1 == true
    IrBasicBlock *true_block = ir_build_basic_block(irb, scope, "BoolAndTrue");
    // block for when val1 == false (don't even evaluate the second part)
    IrBasicBlock *false_block = ir_build_basic_block(irb, scope, "BoolAndFalse");

    ir_build_cond_br(irb, scope, node, val1, true_block, false_block, is_inline);

    ir_set_cursor_at_end(irb, true_block);
    IrInstruction *val2 = ir_gen_node(irb, node->data.bin_op_expr.op2, scope);
    if (val2 == irb->codegen->invalid_instruction)
        return irb->codegen->invalid_instruction;
    IrBasicBlock *post_val2_block = irb->current_basic_block;

    ir_build_br(irb, scope, node, false_block, is_inline);

    ir_set_cursor_at_end(irb, false_block);

    IrInstruction **incoming_values = allocate<IrInstruction *>(2);
    incoming_values[0] = val1;
    incoming_values[1] = val2;
    IrBasicBlock **incoming_blocks = allocate<IrBasicBlock *>(2);
    incoming_blocks[0] = post_val1_block;
    incoming_blocks[1] = post_val2_block;

    return ir_build_phi(irb, scope, node, 2, incoming_blocks, incoming_values);
}

static IrInstruction *ir_gen_bin_op(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeBinOpExpr);

    BinOpType bin_op_type = node->data.bin_op_expr.bin_op;
    switch (bin_op_type) {
        case BinOpTypeInvalid:
            zig_unreachable();
        case BinOpTypeAssign:
            return ir_gen_assign(irb, scope, node);
        case BinOpTypeAssignTimes:
            return ir_gen_assign_op(irb, scope, node, IrBinOpMult);
        case BinOpTypeAssignTimesWrap:
            return ir_gen_assign_op(irb, scope, node, IrBinOpMultWrap);
        case BinOpTypeAssignDiv:
            return ir_gen_assign_op(irb, scope, node, IrBinOpDiv);
        case BinOpTypeAssignMod:
            return ir_gen_assign_op(irb, scope, node, IrBinOpMod);
        case BinOpTypeAssignPlus:
            return ir_gen_assign_op(irb, scope, node, IrBinOpAdd);
        case BinOpTypeAssignPlusWrap:
            return ir_gen_assign_op(irb, scope, node, IrBinOpAddWrap);
        case BinOpTypeAssignMinus:
            return ir_gen_assign_op(irb, scope, node, IrBinOpSub);
        case BinOpTypeAssignMinusWrap:
            return ir_gen_assign_op(irb, scope, node, IrBinOpSubWrap);
        case BinOpTypeAssignBitShiftLeft:
            return ir_gen_assign_op(irb, scope, node, IrBinOpBitShiftLeft);
        case BinOpTypeAssignBitShiftLeftWrap:
            return ir_gen_assign_op(irb, scope, node, IrBinOpBitShiftLeftWrap);
        case BinOpTypeAssignBitShiftRight:
            return ir_gen_assign_op(irb, scope, node, IrBinOpBitShiftRight);
        case BinOpTypeAssignBitAnd:
            return ir_gen_assign_op(irb, scope, node, IrBinOpBinAnd);
        case BinOpTypeAssignBitXor:
            return ir_gen_assign_op(irb, scope, node, IrBinOpBinXor);
        case BinOpTypeAssignBitOr:
            return ir_gen_assign_op(irb, scope, node, IrBinOpBinOr);
        case BinOpTypeAssignBoolAnd:
            return ir_gen_assign_op(irb, scope, node, IrBinOpBoolAnd);
        case BinOpTypeAssignBoolOr:
            return ir_gen_assign_op(irb, scope, node, IrBinOpBoolOr);
        case BinOpTypeBoolOr:
            return ir_gen_bool_or(irb, scope, node);
        case BinOpTypeBoolAnd:
            return ir_gen_bool_and(irb, scope, node);
        case BinOpTypeCmpEq:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpCmpEq);
        case BinOpTypeCmpNotEq:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpCmpNotEq);
        case BinOpTypeCmpLessThan:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpCmpLessThan);
        case BinOpTypeCmpGreaterThan:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpCmpGreaterThan);
        case BinOpTypeCmpLessOrEq:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpCmpLessOrEq);
        case BinOpTypeCmpGreaterOrEq:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpCmpGreaterOrEq);
        case BinOpTypeBinOr:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpBinOr);
        case BinOpTypeBinXor:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpBinXor);
        case BinOpTypeBinAnd:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpBinAnd);
        case BinOpTypeBitShiftLeft:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpBitShiftLeft);
        case BinOpTypeBitShiftLeftWrap:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpBitShiftLeftWrap);
        case BinOpTypeBitShiftRight:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpBitShiftRight);
        case BinOpTypeAdd:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpAdd);
        case BinOpTypeAddWrap:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpAddWrap);
        case BinOpTypeSub:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpSub);
        case BinOpTypeSubWrap:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpSubWrap);
        case BinOpTypeMult:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpMult);
        case BinOpTypeMultWrap:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpMultWrap);
        case BinOpTypeDiv:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpDiv);
        case BinOpTypeMod:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpMod);
        case BinOpTypeArrayCat:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpArrayCat);
        case BinOpTypeArrayMult:
            return ir_gen_bin_op_id(irb, scope, node, IrBinOpArrayMult);
        case BinOpTypeUnwrapMaybe:
            zig_panic("TODO gen IR for unwrap maybe binary operation");
    }
    zig_unreachable();
}

static IrInstruction *ir_gen_num_lit(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeNumberLiteral);

    if (node->data.number_literal.overflow) {
        add_node_error(irb->codegen, node, buf_sprintf("number literal too large to be represented in any type"));
        return irb->codegen->invalid_instruction;
    }

    return ir_build_const_bignum(irb, scope, node, node->data.number_literal.bignum);
}

static IrInstruction *ir_gen_null_literal(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeNullLiteral);

    return ir_build_const_null(irb, scope, node);
}

static IrInstruction *ir_gen_decl_ref(IrBuilder *irb, AstNode *source_node, Tld *tld,
        LValPurpose lval, Scope *scope)
{
    resolve_top_level_decl(irb->codegen, tld, lval != LValPurposeNone);
    if (tld->resolution == TldResolutionInvalid)
        return irb->codegen->invalid_instruction;

    switch (tld->id) {
        case TldIdVar:
        {
            TldVar *tld_var = (TldVar *)tld;
            VariableTableEntry *var = tld_var->var;
            IrInstruction *var_ptr = ir_build_var_ptr(irb, scope, source_node, var);
            if (lval != LValPurposeNone)
                return var_ptr;
            else
                return ir_build_load_ptr(irb, scope, source_node, var_ptr);
        }
        case TldIdFn:
        {
            TldFn *tld_fn = (TldFn *)tld;
            FnTableEntry *fn_entry = tld_fn->fn_entry;
            assert(fn_entry->type_entry);
            IrInstruction *ref_instruction = ir_build_const_fn(irb, scope, source_node, fn_entry);
            if (lval != LValPurposeNone)
                return ir_build_ref(irb, scope, source_node, ref_instruction);
            else
                return ref_instruction;
        }
        case TldIdContainer:
        {
            TldContainer *tld_container = (TldContainer *)tld;

            IrInstruction *ref_instruction = ir_build_const_type(irb, scope, source_node, tld_container->type_entry);
            if (lval != LValPurposeNone)
                return ir_build_ref(irb, scope, source_node, ref_instruction);
            else
                return ref_instruction;
        }
        case TldIdTypeDef:
        {
            TldTypeDef *tld_typedef = (TldTypeDef *)tld;
            TypeTableEntry *typedef_type = tld_typedef->type_entry;
            IrInstruction *ref_instruction = ir_build_const_type(irb, scope, source_node, typedef_type);
            if (lval != LValPurposeNone)
                return ir_build_ref(irb, scope, source_node, ref_instruction);
            else
                return ref_instruction;
        }
    }
    zig_unreachable();
}

static IrInstruction *ir_gen_symbol(IrBuilder *irb, Scope *scope, AstNode *node, LValPurpose lval) {
    assert(node->type == NodeTypeSymbol);

    Buf *variable_name = node->data.symbol_expr.symbol;

    auto primitive_table_entry = irb->codegen->primitive_type_table.maybe_get(variable_name);
    if (primitive_table_entry) {
        IrInstruction *value = ir_build_const_type(irb, scope, node, primitive_table_entry->value);
        if (lval == LValPurposeAddressOf) {
            return ir_build_un_op(irb, scope, node, IrUnOpAddressOf, value);
        } else {
            return value;
        }
    }

    VariableTableEntry *var = find_variable(irb->codegen, scope, variable_name);
    if (var) {
        IrInstruction *var_ptr = ir_build_var_ptr(irb, scope, node, var);
        if (lval != LValPurposeNone)
            return var_ptr;
        else
            return ir_build_load_ptr(irb, scope, node, var_ptr);
    }

    Tld *tld = find_decl(scope, variable_name);
    if (tld)
        return ir_gen_decl_ref(irb, node, tld, lval, scope);

    if (node->owner->any_imports_failed) {
        // skip the error message since we had a failing import in this file
        // if an import breaks we don't need redundant undeclared identifier errors
        return irb->codegen->invalid_instruction;
    }

    add_node_error(irb->codegen, node, buf_sprintf("use of undeclared identifier '%s'", buf_ptr(variable_name)));
    return irb->codegen->invalid_instruction;
}

static IrInstruction *ir_gen_array_access(IrBuilder *irb, Scope *scope, AstNode *node, LValPurpose lval) {
    assert(node->type == NodeTypeArrayAccessExpr);

    AstNode *array_ref_node = node->data.array_access_expr.array_ref_expr;
    IrInstruction *array_ref_instruction = ir_gen_node_extra(irb, array_ref_node, scope,
            LValPurposeAddressOf);
    if (array_ref_instruction == irb->codegen->invalid_instruction)
        return array_ref_instruction;

    AstNode *subscript_node = node->data.array_access_expr.subscript;
    IrInstruction *subscript_instruction = ir_gen_node(irb, subscript_node, scope);
    if (subscript_instruction == irb->codegen->invalid_instruction)
        return subscript_instruction;

    IrInstruction *ptr_instruction = ir_build_elem_ptr(irb, scope, node, array_ref_instruction,
            subscript_instruction, true);
    if (lval != LValPurposeNone)
        return ptr_instruction;

    return ir_build_load_ptr(irb, scope, node, ptr_instruction);
}

static IrInstruction *ir_gen_field_access(IrBuilder *irb, Scope *scope, AstNode *node, LValPurpose lval) {
    assert(node->type == NodeTypeFieldAccessExpr);

    AstNode *container_ref_node = node->data.field_access_expr.struct_expr;
    Buf *field_name = node->data.field_access_expr.field_name;

    IrInstruction *container_ref_instruction = ir_gen_node_extra(irb, container_ref_node, scope,
            LValPurposeAddressOf);
    if (container_ref_instruction == irb->codegen->invalid_instruction)
        return container_ref_instruction;

    IrInstruction *ptr_instruction = ir_build_field_ptr(irb, scope, node, container_ref_instruction, field_name);
    if (lval != LValPurposeNone)
        return ptr_instruction;

    return ir_build_load_ptr(irb, scope, node, ptr_instruction);
}

static IrInstruction *ir_gen_builtin_fn_call(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeFnCallExpr);

    AstNode *fn_ref_expr = node->data.fn_call_expr.fn_ref_expr;
    Buf *name = fn_ref_expr->data.symbol_expr.symbol;
    auto entry = irb->codegen->builtin_fn_table.maybe_get(name);

    if (!entry) {
        add_node_error(irb->codegen, node,
                buf_sprintf("invalid builtin function: '%s'", buf_ptr(name)));
        return irb->codegen->invalid_instruction;
    }

    BuiltinFnEntry *builtin_fn = entry->value;
    size_t actual_param_count = node->data.fn_call_expr.params.length;

    if (builtin_fn->param_count != actual_param_count) {
        add_node_error(irb->codegen, node,
                buf_sprintf("expected %zu arguments, found %zu",
                    builtin_fn->param_count, actual_param_count));
        return irb->codegen->invalid_instruction;
    }

    builtin_fn->ref_count += 1;

    switch (builtin_fn->id) {
        case BuiltinFnIdInvalid:
            zig_unreachable();
        case BuiltinFnIdUnreachable:
            return ir_build_unreachable(irb, scope, node);
        case BuiltinFnIdTypeof:
            {
                AstNode *arg_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg = ir_gen_node(irb, arg_node, scope);
                if (arg == irb->codegen->invalid_instruction)
                    return arg;
                return ir_build_typeof(irb, scope, node, arg);
            }
        case BuiltinFnIdSetFnTest:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_set_fn_test(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdSetFnVisible:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                return ir_build_set_fn_visible(irb, scope, node, arg0_value, arg1_value);
            }
        case BuiltinFnIdSetDebugSafety:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                return ir_build_set_debug_safety(irb, scope, node, arg0_value, arg1_value);
            }
        case BuiltinFnIdCompileVar:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_compile_var(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdSizeof:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_size_of(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdCtz:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_ctz(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdClz:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_clz(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdStaticEval:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_static_eval(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdImport:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                if (exec_fn_entry(irb->exec)) {
                    add_node_error(irb->codegen, node, buf_sprintf("import valid only at global scope"));
                    return irb->codegen->invalid_instruction;
                }

                return ir_build_import(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdCImport:
            {
                if (exec_fn_entry(irb->exec)) {
                    add_node_error(irb->codegen, node, buf_sprintf("C import valid only at global scope"));
                    return irb->codegen->invalid_instruction;
                }

                return ir_build_c_import(irb, scope, node);
            }
        case BuiltinFnIdCInclude:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                if (!exec_c_import_buf(irb->exec)) {
                    add_node_error(irb->codegen, node, buf_sprintf("C include valid only inside C import block"));
                    return irb->codegen->invalid_instruction;
                }

                return ir_build_c_include(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdCDefine:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                if (!exec_c_import_buf(irb->exec)) {
                    add_node_error(irb->codegen, node, buf_sprintf("C define valid only inside C import block"));
                    return irb->codegen->invalid_instruction;
                }

                return ir_build_c_define(irb, scope, node, arg0_value, arg1_value);
            }
        case BuiltinFnIdCUndef:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                if (!exec_c_import_buf(irb->exec)) {
                    add_node_error(irb->codegen, node, buf_sprintf("C undef valid only inside C import block"));
                    return irb->codegen->invalid_instruction;
                }

                return ir_build_c_undef(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdMaxValue:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_max_value(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdMinValue:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_min_value(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdCompileErr:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_compile_err(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdErrName:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_err_name(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdEmbedFile:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_embed_file(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdCmpExchange:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                AstNode *arg2_node = node->data.fn_call_expr.params.at(2);
                IrInstruction *arg2_value = ir_gen_node(irb, arg2_node, scope);
                if (arg2_value == irb->codegen->invalid_instruction)
                    return arg2_value;

                AstNode *arg3_node = node->data.fn_call_expr.params.at(3);
                IrInstruction *arg3_value = ir_gen_node(irb, arg3_node, scope);
                if (arg3_value == irb->codegen->invalid_instruction)
                    return arg3_value;

                AstNode *arg4_node = node->data.fn_call_expr.params.at(4);
                IrInstruction *arg4_value = ir_gen_node(irb, arg4_node, scope);
                if (arg4_value == irb->codegen->invalid_instruction)
                    return arg4_value;

                return ir_build_cmpxchg(irb, scope, node, arg0_value, arg1_value,
                    arg2_value, arg3_value, arg4_value,
                    AtomicOrderUnordered, AtomicOrderUnordered);
            }
        case BuiltinFnIdFence:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_fence(irb, scope, node, arg0_value, AtomicOrderUnordered);
            }
        case BuiltinFnIdDivExact:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                return ir_build_div_exact(irb, scope, node, arg0_value, arg1_value);
            }
        case BuiltinFnIdTruncate:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                return ir_build_truncate(irb, scope, node, arg0_value, arg1_value);
            }
        case BuiltinFnIdIntType:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                return ir_build_int_type(irb, scope, node, arg0_value, arg1_value);
            }
        case BuiltinFnIdAlloca:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                return ir_build_alloca(irb, scope, node, arg0_value, arg1_value);
            }
        case BuiltinFnIdMemcpy:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                AstNode *arg2_node = node->data.fn_call_expr.params.at(2);
                IrInstruction *arg2_value = ir_gen_node(irb, arg2_node, scope);
                if (arg2_value == irb->codegen->invalid_instruction)
                    return arg2_value;

                return ir_build_memcpy(irb, scope, node, arg0_value, arg1_value, arg2_value);
            }
        case BuiltinFnIdMemset:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
                if (arg1_value == irb->codegen->invalid_instruction)
                    return arg1_value;

                AstNode *arg2_node = node->data.fn_call_expr.params.at(2);
                IrInstruction *arg2_value = ir_gen_node(irb, arg2_node, scope);
                if (arg2_value == irb->codegen->invalid_instruction)
                    return arg2_value;

                return ir_build_memset(irb, scope, node, arg0_value, arg1_value, arg2_value);
            }
        case BuiltinFnIdMemberCount:
            {
                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
                if (arg0_value == irb->codegen->invalid_instruction)
                    return arg0_value;

                return ir_build_member_count(irb, scope, node, arg0_value);
            }
        case BuiltinFnIdAlignof:
        case BuiltinFnIdAddWithOverflow:
        case BuiltinFnIdSubWithOverflow:
        case BuiltinFnIdMulWithOverflow:
        case BuiltinFnIdShlWithOverflow:
        case BuiltinFnIdBreakpoint:
        case BuiltinFnIdReturnAddress:
        case BuiltinFnIdFrameAddress:
            zig_panic("TODO IR gen more builtin functions");
    }
    zig_unreachable();
}

static IrInstruction *ir_gen_fn_call(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeFnCallExpr);

    if (node->data.fn_call_expr.is_builtin)
        return ir_gen_builtin_fn_call(irb, scope, node);

    AstNode *fn_ref_node = node->data.fn_call_expr.fn_ref_expr;
    IrInstruction *fn_ref = ir_gen_node(irb, fn_ref_node, scope);
    if (fn_ref == irb->codegen->invalid_instruction)
        return fn_ref;

    size_t arg_count = node->data.fn_call_expr.params.length;
    IrInstruction **args = allocate<IrInstruction*>(arg_count);
    for (size_t i = 0; i < arg_count; i += 1) {
        AstNode *arg_node = node->data.fn_call_expr.params.at(i);
        args[i] = ir_gen_node(irb, arg_node, scope);
    }

    return ir_build_call(irb, scope, node, nullptr, fn_ref, arg_count, args);
}

static IrInstruction *ir_gen_if_bool_expr(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeIfBoolExpr);

    IrInstruction *condition = ir_gen_node(irb, node->data.if_bool_expr.condition, scope);
    if (condition == irb->codegen->invalid_instruction)
        return condition;

    AstNode *then_node = node->data.if_bool_expr.then_block;
    AstNode *else_node = node->data.if_bool_expr.else_node;

    IrBasicBlock *then_block = ir_build_basic_block(irb, scope, "Then");
    IrBasicBlock *else_block = ir_build_basic_block(irb, scope, "Else");
    IrBasicBlock *endif_block = ir_build_basic_block(irb, scope, "EndIf");

    bool is_inline = ir_should_inline(irb) || node->data.if_bool_expr.is_inline;
    ir_build_cond_br(irb, scope, condition->source_node, condition, then_block, else_block, is_inline);

    ir_set_cursor_at_end(irb, then_block);
    IrInstruction *then_expr_result = ir_gen_node(irb, then_node, scope);
    if (then_expr_result == irb->codegen->invalid_instruction)
        return then_expr_result;
    IrBasicBlock *after_then_block = irb->current_basic_block;
    ir_build_br(irb, scope, node, endif_block, is_inline);

    ir_set_cursor_at_end(irb, else_block);
    IrInstruction *else_expr_result;
    if (else_node) {
        else_expr_result = ir_gen_node(irb, else_node, scope);
        if (else_expr_result == irb->codegen->invalid_instruction)
            return else_expr_result;
    } else {
        else_expr_result = ir_build_const_void(irb, scope, node);
    }
    IrBasicBlock *after_else_block = irb->current_basic_block;
    ir_build_br(irb, scope, node, endif_block, is_inline);

    ir_set_cursor_at_end(irb, endif_block);
    IrInstruction **incoming_values = allocate<IrInstruction *>(2);
    incoming_values[0] = then_expr_result;
    incoming_values[1] = else_expr_result;
    IrBasicBlock **incoming_blocks = allocate<IrBasicBlock *>(2);
    incoming_blocks[0] = after_then_block;
    incoming_blocks[1] = after_else_block;

    return ir_build_phi(irb, scope, node, 2, incoming_blocks, incoming_values);
}

static IrInstruction *ir_gen_prefix_op_id_lval(IrBuilder *irb, Scope *scope, AstNode *node, IrUnOp op_id, LValPurpose lval) {
    assert(node->type == NodeTypePrefixOpExpr);
    AstNode *expr_node = node->data.prefix_op_expr.primary_expr;

    IrInstruction *value = ir_gen_node_extra(irb, expr_node, scope, lval);
    if (value == irb->codegen->invalid_instruction)
        return value;

    if (lval == LValPurposeAddressOf && (op_id == IrUnOpAddressOf || op_id == IrUnOpConstAddressOf)) {
        return value;
    }

    return ir_build_un_op(irb, scope, node, op_id, value);
}

static IrInstruction *ir_gen_prefix_op_id(IrBuilder *irb, Scope *scope, AstNode *node, IrUnOp op_id) {
    return ir_gen_prefix_op_id_lval(irb, scope, node, op_id, LValPurposeNone);
}

static IrInstruction *ir_gen_prefix_op_unwrap_maybe(IrBuilder *irb, Scope *scope, AstNode *node, LValPurpose lval) {
    AstNode *expr = node->data.prefix_op_expr.primary_expr;
    IrInstruction *value = ir_gen_node_extra(irb, expr, scope, LValPurposeAddressOf);
    if (value == irb->codegen->invalid_instruction)
        return value;

    IrInstruction *unwrapped_ptr = ir_build_unwrap_maybe(irb, scope, node, value, true);
    if (lval == LValPurposeNone)
        return ir_build_load_ptr(irb, scope, node, unwrapped_ptr);
    else
        return unwrapped_ptr;
}

static IrInstruction *ir_gen_bool_not(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypePrefixOpExpr);
    AstNode *expr_node = node->data.prefix_op_expr.primary_expr;

    IrInstruction *value = ir_gen_node(irb, expr_node, scope);
    if (value == irb->codegen->invalid_instruction)
        return irb->codegen->invalid_instruction;

    return ir_build_bool_not(irb, scope, node, value);
}

static IrInstruction *ir_lval_wrap(IrBuilder *irb, Scope *scope, IrInstruction *value, LValPurpose lval) {
    if (lval == LValPurposeNone)
        return value;
    if (value == irb->codegen->invalid_instruction)
        return value;

    // We needed a pointer to a value, but we got a value. So we create
    // an instruction which just makes a const pointer of it.
    return ir_build_ref(irb, scope, value->source_node, value);
}

static IrInstruction *ir_gen_prefix_op_expr(IrBuilder *irb, Scope *scope, AstNode *node, LValPurpose lval) {
    assert(node->type == NodeTypePrefixOpExpr);

    PrefixOp prefix_op = node->data.prefix_op_expr.prefix_op;

    switch (prefix_op) {
        case PrefixOpInvalid:
            zig_unreachable();
        case PrefixOpBoolNot:
            return ir_lval_wrap(irb, scope, ir_gen_bool_not(irb, scope, node), lval);
        case PrefixOpBinNot:
            return ir_gen_prefix_op_id(irb, scope, node, IrUnOpBinNot);
        case PrefixOpNegation:
            return ir_gen_prefix_op_id(irb, scope, node, IrUnOpNegation);
        case PrefixOpNegationWrap:
            return ir_gen_prefix_op_id(irb, scope, node, IrUnOpNegationWrap);
        case PrefixOpAddressOf:
            return ir_gen_prefix_op_id_lval(irb, scope, node, IrUnOpAddressOf, LValPurposeAddressOf);
        case PrefixOpConstAddressOf:
            return ir_gen_prefix_op_id_lval(irb, scope, node, IrUnOpConstAddressOf, LValPurposeAddressOf);
        case PrefixOpDereference:
            return ir_gen_prefix_op_id_lval(irb, scope, node, IrUnOpDereference, lval);
        case PrefixOpMaybe:
            return ir_gen_prefix_op_id(irb, scope, node, IrUnOpMaybe);
        case PrefixOpError:
            return ir_gen_prefix_op_id(irb, scope, node, IrUnOpError);
        case PrefixOpUnwrapError:
            return ir_gen_prefix_op_id(irb, scope, node, IrUnOpUnwrapError);
        case PrefixOpUnwrapMaybe:
            return ir_gen_prefix_op_unwrap_maybe(irb, scope, node, lval);
    }
    zig_unreachable();
}

static IrInstruction *ir_gen_container_init_expr(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeContainerInitExpr);

    AstNodeContainerInitExpr *container_init_expr = &node->data.container_init_expr;
    ContainerInitKind kind = container_init_expr->kind;

    IrInstruction *container_type = ir_gen_node(irb, container_init_expr->type, scope);
    if (container_type == irb->codegen->invalid_instruction)
        return container_type;

    if (kind == ContainerInitKindStruct) {
        size_t field_count = container_init_expr->entries.length;
        IrInstructionContainerInitFieldsField *fields = allocate<IrInstructionContainerInitFieldsField>(field_count);
        for (size_t i = 0; i < field_count; i += 1) {
            AstNode *entry_node = container_init_expr->entries.at(i);
            assert(entry_node->type == NodeTypeStructValueField);

            Buf *name = entry_node->data.struct_val_field.name;
            AstNode *expr_node = entry_node->data.struct_val_field.expr;
            IrInstruction *expr_value = ir_gen_node(irb, expr_node, scope);
            if (expr_value == irb->codegen->invalid_instruction)
                return expr_value;

            fields[i].name = name;
            fields[i].value = expr_value;
            fields[i].source_node = entry_node;
        }
        return ir_build_container_init_fields(irb, scope, node, container_type, field_count, fields);
    } else if (kind == ContainerInitKindArray) {
        size_t item_count = container_init_expr->entries.length;
        IrInstruction **values = allocate<IrInstruction *>(item_count);
        for (size_t i = 0; i < item_count; i += 1) {
            AstNode *expr_node = container_init_expr->entries.at(i);
            IrInstruction *expr_value = ir_gen_node(irb, expr_node, scope);
            if (expr_value == irb->codegen->invalid_instruction)
                return expr_value;

            values[i] = expr_value;
        }
        return ir_build_container_init_list(irb, scope, node, container_type, item_count, values);
    } else {
        zig_unreachable();
    }
}

static IrInstruction *ir_gen_var_decl(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeVariableDeclaration);

    AstNodeVariableDeclaration *variable_declaration = &node->data.variable_declaration;

    IrInstruction *type_instruction;
    if (variable_declaration->type != nullptr) {
        type_instruction = ir_gen_node(irb, variable_declaration->type, scope);
        if (type_instruction == irb->codegen->invalid_instruction)
            return type_instruction;
    } else {
        type_instruction = nullptr;
    }

    IrInstruction *init_value = ir_gen_node(irb, variable_declaration->expr, scope);
    if (init_value == irb->codegen->invalid_instruction)
        return init_value;

    bool is_shadowable = false;
    bool is_const = variable_declaration->is_const;
    bool is_extern = variable_declaration->is_extern;
    bool is_inline = ir_should_inline(irb) || variable_declaration->is_inline;
    VariableTableEntry *var = ir_create_var(irb, node, scope,
            variable_declaration->symbol, is_const, is_const, is_shadowable, is_inline);
    // we detect IrInstructionIdDeclVar in gen_block to make sure the next node
    // is inside var->child_scope

    if (!is_extern && !variable_declaration->expr) {
        var->type = irb->codegen->builtin_types.entry_invalid;
        add_node_error(irb->codegen, node, buf_sprintf("variables must be initialized"));
        return irb->codegen->invalid_instruction;
    }

    return ir_build_var_decl(irb, scope, node, var, type_instruction, init_value);
}

static IrInstruction *ir_gen_while_expr(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeWhileExpr);

    AstNode *continue_expr_node = node->data.while_expr.continue_expr;

    IrBasicBlock *cond_block = ir_build_basic_block(irb, scope, "WhileCond");
    IrBasicBlock *body_block = ir_build_basic_block(irb, scope, "WhileBody");
    IrBasicBlock *continue_block = continue_expr_node ?
        ir_build_basic_block(irb, scope, "WhileContinue") : cond_block;
    IrBasicBlock *end_block = ir_build_basic_block(irb, scope, "WhileEnd");

    bool is_inline = ir_should_inline(irb) || node->data.while_expr.is_inline;
    ir_build_br(irb, scope, node, cond_block, is_inline);

    if (continue_expr_node) {
        ir_set_cursor_at_end(irb, continue_block);
        ir_gen_node(irb, continue_expr_node, scope);
        ir_build_br(irb, scope, node, cond_block, is_inline);
    }

    ir_set_cursor_at_end(irb, cond_block);
    IrInstruction *cond_val = ir_gen_node(irb, node->data.while_expr.condition, scope);
    ir_build_cond_br(irb, scope, node->data.while_expr.condition, cond_val, body_block, end_block, is_inline);

    ir_set_cursor_at_end(irb, body_block);

    LoopStackItem *loop_stack_item = irb->loop_stack.add_one();
    loop_stack_item->break_block = end_block;
    loop_stack_item->continue_block = continue_block;
    loop_stack_item->is_inline = is_inline;
    ir_gen_node(irb, node->data.while_expr.body, scope);
    irb->loop_stack.pop();

    ir_build_br(irb, scope, node, continue_block, is_inline);
    ir_set_cursor_at_end(irb, end_block);

    return ir_build_const_void(irb, scope, node);
}

static IrInstruction *ir_gen_for_expr(IrBuilder *irb, Scope *parent_scope, AstNode *node) {
    assert(node->type == NodeTypeForExpr);

    AstNode *array_node = node->data.for_expr.array_expr;
    AstNode *elem_node = node->data.for_expr.elem_node;
    AstNode *index_node = node->data.for_expr.index_node;
    AstNode *body_node = node->data.for_expr.body;

    if (!elem_node) {
        add_node_error(irb->codegen, node, buf_sprintf("for loop expression missing element parameter"));
        return irb->codegen->invalid_instruction;
    }
    assert(elem_node->type == NodeTypeSymbol);

    IrInstruction *array_val_ptr = ir_gen_node_extra(irb, array_node, parent_scope, LValPurposeAddressOf);
    if (array_val_ptr == irb->codegen->invalid_instruction)
        return array_val_ptr;

    IrInstruction *array_val = ir_build_load_ptr(irb, parent_scope, array_node, array_val_ptr);

    IrInstruction *array_type = ir_build_typeof(irb, parent_scope, array_node, array_val);
    IrInstruction *pointer_type = ir_build_to_ptr_type(irb, parent_scope, array_node, array_type);
    IrInstruction *elem_var_type;
    if (node->data.for_expr.elem_is_ptr) {
        elem_var_type = pointer_type;
    } else {
        elem_var_type = ir_build_ptr_type_child(irb, parent_scope, elem_node, pointer_type);
    }
    bool is_inline = ir_should_inline(irb) || node->data.for_expr.is_inline;

    Scope *child_scope = create_loop_scope(node, parent_scope);

    // TODO make it an error to write to element variable or i variable.
    Buf *elem_var_name = elem_node->data.symbol_expr.symbol;
    VariableTableEntry *elem_var = ir_create_var(irb, elem_node, child_scope, elem_var_name,
            true, false, false, is_inline);
    child_scope = elem_var->child_scope;

    IrInstruction *undefined_value = ir_build_const_undefined(irb, child_scope, elem_node);
    ir_build_var_decl(irb, child_scope, elem_node, elem_var, elem_var_type, undefined_value);
    IrInstruction *elem_var_ptr = ir_build_var_ptr(irb, child_scope, node, elem_var);

    AstNode *index_var_source_node;
    VariableTableEntry *index_var;
    if (index_node) {
        index_var_source_node = index_node;
        Buf *index_var_name = index_node->data.symbol_expr.symbol;
        index_var = ir_create_var(irb, index_node, child_scope, index_var_name, true, false, false, is_inline);
    } else {
        index_var_source_node = node;
        index_var = ir_create_var(irb, node, child_scope, nullptr, true, false, true, is_inline);
    }
    child_scope = index_var->child_scope;

    IrInstruction *usize = ir_build_const_type(irb, child_scope, node, irb->codegen->builtin_types.entry_usize);
    IrInstruction *zero = ir_build_const_usize(irb, child_scope, node, 0);
    IrInstruction *one = ir_build_const_usize(irb, child_scope, node, 1);
    ir_build_var_decl(irb, child_scope, index_var_source_node, index_var, usize, zero);
    IrInstruction *index_ptr = ir_build_var_ptr(irb, child_scope, node, index_var);


    IrBasicBlock *cond_block = ir_build_basic_block(irb, child_scope, "ForCond");
    IrBasicBlock *body_block = ir_build_basic_block(irb, child_scope, "ForBody");
    IrBasicBlock *end_block = ir_build_basic_block(irb, child_scope, "ForEnd");
    IrBasicBlock *continue_block = ir_build_basic_block(irb, child_scope, "ForContinue");

    IrInstruction *len_val = ir_build_array_len(irb, child_scope, node, array_val);
    ir_build_br(irb, child_scope, node, cond_block, is_inline);

    ir_set_cursor_at_end(irb, cond_block);
    IrInstruction *index_val = ir_build_load_ptr(irb, child_scope, node, index_ptr);
    IrInstruction *cond = ir_build_bin_op(irb, child_scope, node, IrBinOpCmpLessThan, index_val, len_val, false);
    ir_build_cond_br(irb, child_scope, node, cond, body_block, end_block, is_inline);

    ir_set_cursor_at_end(irb, body_block);
    IrInstruction *elem_ptr = ir_build_elem_ptr(irb, child_scope, node, array_val_ptr, index_val, false);
    IrInstruction *elem_val;
    if (node->data.for_expr.elem_is_ptr) {
        elem_val = elem_ptr;
    } else {
        elem_val = ir_build_load_ptr(irb, child_scope, node, elem_ptr);
    }
    ir_build_store_ptr(irb, child_scope, node, elem_var_ptr, elem_val);

    LoopStackItem *loop_stack_item = irb->loop_stack.add_one();
    loop_stack_item->break_block = end_block;
    loop_stack_item->continue_block = continue_block;
    loop_stack_item->is_inline = is_inline;
    ir_gen_node(irb, body_node, child_scope);
    irb->loop_stack.pop();

    ir_build_br(irb, child_scope, node, continue_block, is_inline);

    ir_set_cursor_at_end(irb, continue_block);
    IrInstruction *new_index_val = ir_build_bin_op(irb, child_scope, node, IrBinOpAdd, index_val, one, false);
    ir_build_store_ptr(irb, child_scope, node, index_ptr, new_index_val);
    ir_build_br(irb, child_scope, node, cond_block, is_inline);

    ir_set_cursor_at_end(irb, end_block);
    return ir_build_const_void(irb, child_scope, node);

}

static IrInstruction *ir_gen_this_literal(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeThisLiteral);

    if (!scope->parent)
        return ir_build_const_import(irb, scope, node, node->owner);

    FnTableEntry *fn_entry = exec_fn_entry(irb->exec);
    if (fn_entry && scope->parent && scope->parent->parent &&
        !scope_fn_entry(scope->parent->parent))
    {
        return ir_build_const_fn(irb, scope, node, fn_entry);
    }

    if (scope->id == ScopeIdDecls) {
        ScopeDecls *decls_scope = (ScopeDecls *)scope;
        TypeTableEntry *container_type = decls_scope->container_type;
        assert(container_type);
        return ir_build_const_type(irb, scope, node, container_type);
    }

    if (scope->id == ScopeIdBlock)
        return ir_build_const_scope(irb, scope, node, scope);

    zig_unreachable();
}

static IrInstruction *ir_gen_bool_literal(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeBoolLiteral);
    return ir_build_const_bool(irb, scope, node, node->data.bool_literal.value);
}

static IrInstruction *ir_gen_string_literal(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeStringLiteral);

    if (node->data.string_literal.c) {
        return ir_build_const_c_str_lit(irb, scope, node, node->data.string_literal.buf);
    } else {
        return ir_build_const_str_lit(irb, scope, node, node->data.string_literal.buf);
    }
}

static IrInstruction *ir_gen_array_type(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeArrayType);

    AstNode *size_node = node->data.array_type.size;
    AstNode *child_type_node = node->data.array_type.child_type;
    bool is_const = node->data.array_type.is_const;

    if (size_node) {
        if (is_const) {
            add_node_error(irb->codegen, node, buf_create_from_str("const qualifier invalid on array type"));
            return irb->codegen->invalid_instruction;
        }

        IrInstruction *size_value = ir_gen_node(irb, size_node, scope);
        if (size_value == irb->codegen->invalid_instruction)
            return size_value;

        IrInstruction *child_type = ir_gen_node(irb, child_type_node, scope);
        if (child_type == irb->codegen->invalid_instruction)
            return child_type;

        return ir_build_array_type(irb, scope, node, size_value, child_type);
    } else {
        IrInstruction *child_type = ir_gen_node(irb, child_type_node, scope);
        if (child_type == irb->codegen->invalid_instruction)
            return child_type;

        return ir_build_slice_type(irb, scope, node, is_const, child_type);
    }
}

static IrInstruction *ir_gen_undefined_literal(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeUndefinedLiteral);
    return ir_build_const_undefined(irb, scope, node);
}

static IrInstruction *ir_gen_asm_expr(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeAsmExpr);

    IrInstruction **input_list = allocate<IrInstruction *>(node->data.asm_expr.input_list.length);
    IrInstruction **output_types = allocate<IrInstruction *>(node->data.asm_expr.output_list.length);
    VariableTableEntry **output_vars = allocate<VariableTableEntry *>(node->data.asm_expr.output_list.length);
    size_t return_count = 0;
    bool is_volatile = node->data.asm_expr.is_volatile;
    if (!is_volatile && node->data.asm_expr.output_list.length == 0) {
        add_node_error(irb->codegen, node,
                buf_sprintf("assembly expression with no output must be marked volatile"));
        return irb->codegen->invalid_instruction;
    }
    for (size_t i = 0; i < node->data.asm_expr.output_list.length; i += 1) {
        AsmOutput *asm_output = node->data.asm_expr.output_list.at(i);
        if (asm_output->return_type) {
            return_count += 1;

            IrInstruction *return_type = ir_gen_node(irb, asm_output->return_type, scope);
            if (return_type == irb->codegen->invalid_instruction)
                return irb->codegen->invalid_instruction;
            if (return_count > 1) {
                add_node_error(irb->codegen, node,
                        buf_sprintf("inline assembly allows up to one output value"));
                return irb->codegen->invalid_instruction;
            }
            output_types[i] = return_type;
        } else {
            Buf *variable_name = asm_output->variable_name;
            VariableTableEntry *var = find_variable(irb->codegen, scope, variable_name);
            if (var) {
                output_vars[i] = var;
            } else {
                add_node_error(irb->codegen, node,
                        buf_sprintf("use of undeclared identifier '%s'", buf_ptr(variable_name)));
                return irb->codegen->invalid_instruction;
            }
        }
    }
    for (size_t i = 0; i < node->data.asm_expr.input_list.length; i += 1) {
        AsmInput *asm_input = node->data.asm_expr.input_list.at(i);
        IrInstruction *input_value = ir_gen_node(irb, asm_input->expr, scope);
        if (input_value == irb->codegen->invalid_instruction)
            return irb->codegen->invalid_instruction;

        input_list[i] = input_value;
    }

    return ir_build_asm(irb, scope, node, input_list, output_types, output_vars, return_count, is_volatile);
}

static IrInstruction *ir_gen_if_var_expr(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeIfVarExpr);

    AstNodeVariableDeclaration *var_decl = &node->data.if_var_expr.var_decl;
    AstNode *expr_node = var_decl->expr;
    AstNode *then_node = node->data.if_var_expr.then_block;
    AstNode *else_node = node->data.if_var_expr.else_node;
    bool var_is_ptr = node->data.if_var_expr.var_is_ptr;

    IrInstruction *expr_value = ir_gen_node_extra(irb, expr_node, scope, LValPurposeAddressOf);
    if (expr_value == irb->codegen->invalid_instruction)
        return expr_value;

    IrInstruction *is_nonnull_value = ir_build_test_null(irb, scope, node, expr_value);

    IrBasicBlock *then_block = ir_build_basic_block(irb, scope, "MaybeThen");
    IrBasicBlock *else_block = ir_build_basic_block(irb, scope, "MaybeElse");
    IrBasicBlock *endif_block = ir_build_basic_block(irb, scope, "MaybeEndIf");

    bool is_inline = ir_should_inline(irb) || node->data.if_var_expr.is_inline;
    ir_build_cond_br(irb, scope, node, is_nonnull_value, then_block, else_block, is_inline);

    ir_set_cursor_at_end(irb, then_block);
    IrInstruction *var_type = nullptr;
    if (var_decl->type) {
        var_type = ir_gen_node(irb, var_decl->type, scope);
        if (var_type == irb->codegen->invalid_instruction)
            return irb->codegen->invalid_instruction;
    }
    bool is_shadowable = false;
    bool is_const = var_decl->is_const;
    VariableTableEntry *var = ir_create_var(irb, node, scope,
            var_decl->symbol, is_const, is_const, is_shadowable, is_inline);

    IrInstruction *var_ptr_value = ir_build_unwrap_maybe(irb, scope, node, expr_value, false);
    IrInstruction *var_value = var_is_ptr ? var_ptr_value : ir_build_load_ptr(irb, scope, node, var_ptr_value);
    ir_build_var_decl(irb, scope, node, var, var_type, var_value);
    IrInstruction *then_expr_result = ir_gen_node(irb, then_node, var->child_scope);
    if (then_expr_result == irb->codegen->invalid_instruction)
        return then_expr_result;
    IrBasicBlock *after_then_block = irb->current_basic_block;
    ir_build_br(irb, scope, node, endif_block, is_inline);

    ir_set_cursor_at_end(irb, else_block);
    IrInstruction *else_expr_result;
    if (else_node) {
        else_expr_result = ir_gen_node(irb, else_node, scope);
        if (else_expr_result == irb->codegen->invalid_instruction)
            return else_expr_result;
    } else {
        else_expr_result = ir_build_const_void(irb, scope, node);
    }
    IrBasicBlock *after_else_block = irb->current_basic_block;
    ir_build_br(irb, scope, node, endif_block, is_inline);

    ir_set_cursor_at_end(irb, endif_block);
    IrInstruction **incoming_values = allocate<IrInstruction *>(2);
    incoming_values[0] = then_expr_result;
    incoming_values[1] = else_expr_result;
    IrBasicBlock **incoming_blocks = allocate<IrBasicBlock *>(2);
    incoming_blocks[0] = after_then_block;
    incoming_blocks[1] = after_else_block;

    return ir_build_phi(irb, scope, node, 2, incoming_blocks, incoming_values);
}

static bool ir_gen_switch_prong_expr(IrBuilder *irb, Scope *scope, AstNode *switch_node, AstNode *prong_node,
        IrBasicBlock *end_block, bool is_inline, IrInstruction *target_value_ptr, IrInstruction *prong_value,
        ZigList<IrBasicBlock *> *incoming_blocks, ZigList<IrInstruction *> *incoming_values)
{
    assert(switch_node->type == NodeTypeSwitchExpr);
    assert(prong_node->type == NodeTypeSwitchProng);

    AstNode *expr_node = prong_node->data.switch_prong.expr;
    AstNode *var_symbol_node = prong_node->data.switch_prong.var_symbol;
    Scope *child_scope;
    if (var_symbol_node) {
        assert(var_symbol_node->type == NodeTypeSymbol);
        Buf *var_name = var_symbol_node->data.symbol_expr.symbol;
        bool var_is_ptr = prong_node->data.switch_prong.var_is_ptr;

        bool is_shadowable = false;
        bool is_const = true;
        VariableTableEntry *var = ir_create_var(irb, var_symbol_node, scope,
                var_name, is_const, is_const, is_shadowable, is_inline);
        child_scope = var->child_scope;
        IrInstruction *var_value;
        if (prong_value) {
            IrInstruction *var_ptr_value = ir_build_switch_var(irb, scope, var_symbol_node, target_value_ptr, prong_value);
            var_value = var_is_ptr ? var_ptr_value : ir_build_load_ptr(irb, scope, var_symbol_node, var_ptr_value);
        } else {
            var_value = var_is_ptr ? target_value_ptr : ir_build_load_ptr(irb, scope, var_symbol_node, target_value_ptr);
        }
        IrInstruction *var_type = nullptr; // infer the type
        ir_build_var_decl(irb, scope, var_symbol_node, var, var_type, var_value);
    } else {
        child_scope = scope;
    }

    IrInstruction *expr_result = ir_gen_node(irb, expr_node, child_scope);
    if (expr_result == irb->codegen->invalid_instruction)
        return false;
    ir_build_br(irb, scope, switch_node, end_block, is_inline);
    incoming_blocks->append(irb->current_basic_block);
    incoming_values->append(expr_result);
    return true;
}

static IrInstruction *ir_gen_switch_expr(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeSwitchExpr);

    AstNode *target_node = node->data.switch_expr.expr;
    IrInstruction *target_value_ptr = ir_gen_node_extra(irb, target_node, scope, LValPurposeAddressOf);
    if (target_value_ptr == irb->codegen->invalid_instruction)
        return target_value_ptr;
    IrInstruction *target_value = ir_build_switch_target(irb, scope, node, target_value_ptr);

    IrBasicBlock *else_block = ir_build_basic_block(irb, scope, "SwitchElse");
    IrBasicBlock *end_block = ir_build_basic_block(irb, scope, "SwitchEnd");

    size_t prong_count = node->data.switch_expr.prongs.length;
    ZigList<IrInstructionSwitchBrCase> cases = {0};
    bool is_inline = ir_should_inline(irb) || node->data.switch_expr.is_inline;

    ZigList<IrInstruction *> incoming_values = {0};
    ZigList<IrBasicBlock *> incoming_blocks = {0};

    AstNode *else_prong = nullptr;
    for (size_t prong_i = 0; prong_i < prong_count; prong_i += 1) {
        AstNode *prong_node = node->data.switch_expr.prongs.at(prong_i);
        size_t prong_item_count = prong_node->data.switch_prong.items.length;
        if (prong_item_count == 0) {
            if (else_prong) {
                ErrorMsg *msg = add_node_error(irb->codegen, prong_node,
                        buf_sprintf("multiple else prongs in switch expression"));
                add_error_note(irb->codegen, msg, else_prong,
                        buf_sprintf("previous else prong is here"));
                return irb->codegen->invalid_instruction;
            }
            else_prong = prong_node;

            IrBasicBlock *prev_block = irb->current_basic_block;
            ir_set_cursor_at_end(irb, else_block);
            if (!ir_gen_switch_prong_expr(irb, scope, node, prong_node, end_block,
                is_inline, target_value_ptr, nullptr, &incoming_blocks, &incoming_values))
            {
                return irb->codegen->invalid_instruction;
            }
            ir_set_cursor_at_end(irb, prev_block);
        } else {
            if (prong_node->data.switch_prong.any_items_are_range) {
                IrInstruction *ok_bit = nullptr;
                AstNode *last_item_node = nullptr;
                for (size_t item_i = 0; item_i < prong_item_count; item_i += 1) {
                    AstNode *item_node = prong_node->data.switch_prong.items.at(item_i);
                    last_item_node = item_node;
                    if (item_node->type == NodeTypeSwitchRange) {
                        AstNode *start_node = item_node->data.switch_range.start;
                        AstNode *end_node = item_node->data.switch_range.end;

                        IrInstruction *start_value = ir_gen_node(irb, start_node, scope);
                        if (start_value == irb->codegen->invalid_instruction)
                            return irb->codegen->invalid_instruction;

                        IrInstruction *end_value = ir_gen_node(irb, end_node, scope);
                        if (end_value == irb->codegen->invalid_instruction)
                            return irb->codegen->invalid_instruction;

                        IrInstruction *start_value_const = ir_build_static_eval(irb, scope, start_node, start_value);
                        IrInstruction *end_value_const = ir_build_static_eval(irb, scope, start_node, end_value);

                        IrInstruction *lower_range_ok = ir_build_bin_op(irb, scope, item_node, IrBinOpCmpGreaterOrEq,
                                target_value, start_value_const, false);
                        IrInstruction *upper_range_ok = ir_build_bin_op(irb, scope, item_node, IrBinOpCmpLessOrEq,
                                target_value, end_value_const, false);
                        IrInstruction *both_ok = ir_build_bin_op(irb, scope, item_node, IrBinOpBoolAnd,
                                lower_range_ok, upper_range_ok, false);
                        if (ok_bit) {
                            ok_bit = ir_build_bin_op(irb, scope, item_node, IrBinOpBoolOr, both_ok, ok_bit, false);
                        } else {
                            ok_bit = both_ok;
                        }
                    } else {
                        IrInstruction *item_value = ir_gen_node(irb, item_node, scope);
                        if (item_value == irb->codegen->invalid_instruction)
                            return irb->codegen->invalid_instruction;

                        IrInstruction *cmp_ok = ir_build_bin_op(irb, scope, item_node, IrBinOpCmpEq,
                                item_value, target_value, false);
                        if (ok_bit) {
                            ok_bit = ir_build_bin_op(irb, scope, item_node, IrBinOpBoolOr, cmp_ok, ok_bit, false);
                        } else {
                            ok_bit = cmp_ok;
                        }
                    }
                }

                IrBasicBlock *range_block_yes = ir_build_basic_block(irb, scope, "SwitchRangeYes");
                IrBasicBlock *range_block_no = ir_build_basic_block(irb, scope, "SwitchRangeNo");

                assert(ok_bit);
                assert(last_item_node);
                ir_build_cond_br(irb, scope, last_item_node, ok_bit, range_block_yes, range_block_no, is_inline);

                ir_set_cursor_at_end(irb, range_block_yes);
                if (!ir_gen_switch_prong_expr(irb, scope, node, prong_node, end_block,
                    is_inline, target_value_ptr, nullptr, &incoming_blocks, &incoming_values))
                {
                    return irb->codegen->invalid_instruction;
                }

                ir_set_cursor_at_end(irb, range_block_no);
            } else {
                IrBasicBlock *prong_block = ir_build_basic_block(irb, scope, "SwitchProng");
                IrInstruction *last_item_value = nullptr;

                for (size_t item_i = 0; item_i < prong_item_count; item_i += 1) {
                    AstNode *item_node = prong_node->data.switch_prong.items.at(item_i);
                    assert(item_node->type != NodeTypeSwitchRange);

                    IrInstruction *item_value = ir_gen_node(irb, item_node, scope);
                    if (item_value == irb->codegen->invalid_instruction)
                        return irb->codegen->invalid_instruction;

                    IrInstructionSwitchBrCase *this_case = cases.add_one();
                    this_case->value = item_value;
                    this_case->block = prong_block;

                    last_item_value = item_value;
                }
                IrInstruction *only_item_value = (prong_item_count == 1) ? last_item_value : nullptr;

                IrBasicBlock *prev_block = irb->current_basic_block;
                ir_set_cursor_at_end(irb, prong_block);
                if (!ir_gen_switch_prong_expr(irb, scope, node, prong_node, end_block,
                    is_inline, target_value_ptr, only_item_value, &incoming_blocks, &incoming_values))
                {
                    return irb->codegen->invalid_instruction;
                }

                ir_set_cursor_at_end(irb, prev_block);

            }
        }
    }

    if (cases.length == 0) {
        ir_build_br(irb, scope, node, else_block, is_inline);
    } else {
        ir_build_switch_br(irb, scope, node, target_value, else_block, cases.length, cases.items, is_inline);
    }

    if (!else_prong) {
        ir_set_cursor_at_end(irb, else_block);
        ir_build_unreachable(irb, scope, node);
    }

    ir_set_cursor_at_end(irb, end_block);
    assert(incoming_blocks.length == incoming_values.length);
    return ir_build_phi(irb, scope, node, incoming_blocks.length, incoming_blocks.items, incoming_values.items);
}

static LabelTableEntry *find_label(IrExecutable *exec, Scope *scope, Buf *name) {
    while (scope) {
        if (scope->id == ScopeIdBlock) {
            ScopeBlock *block_scope = (ScopeBlock *)scope;
            auto entry = block_scope->label_table.maybe_get(name);
            if (entry)
                return entry->value;
        }
        scope = scope->parent;
    }

    return nullptr;
}

static ScopeBlock *find_block_scope(IrExecutable *exec, Scope *scope) {
    while (scope) {
        if (scope->id == ScopeIdBlock)
            return (ScopeBlock *)scope;
        scope = scope->parent;
    }
    return nullptr;
}

static IrInstruction *ir_gen_label(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeLabel);

    Buf *label_name = node->data.label.name;
    IrBasicBlock *label_block = ir_build_basic_block(irb, scope, buf_ptr(label_name));
    LabelTableEntry *label = allocate<LabelTableEntry>(1);
    label->decl_node = node;
    label->bb = label_block;
    irb->exec->all_labels.append(label);

    LabelTableEntry *existing_label = find_label(irb->exec, scope, label_name);
    if (existing_label) {
        ErrorMsg *msg = add_node_error(irb->codegen, node,
            buf_sprintf("duplicate label name '%s'", buf_ptr(label_name)));
        add_error_note(irb->codegen, msg, existing_label->decl_node, buf_sprintf("other label here"));
        return irb->codegen->invalid_instruction;
    } else {
        ScopeBlock *scope_block = find_block_scope(irb->exec, scope);
        scope_block->label_table.put(label_name, label);
    }

    bool is_inline = ir_should_inline(irb);
    ir_build_br(irb, scope, node, label_block, is_inline);
    ir_set_cursor_at_end(irb, label_block);
    return ir_build_const_void(irb, scope, node);
}

static IrInstruction *ir_gen_goto(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeGoto);

    // make a placeholder unreachable statement and a note to come back and
    // replace the instruction with a branch instruction
    IrGotoItem *goto_item = irb->exec->goto_list.add_one();
    goto_item->bb = irb->current_basic_block;
    goto_item->instruction_index = irb->current_basic_block->instruction_list.length;
    goto_item->source_node = node;
    goto_item->scope = scope;

    // we don't know if we need to generate defer expressions yet
    // we do that later when we find out which label we're jumping to.
    return ir_build_unreachable(irb, scope, node);
}

static IrInstruction *ir_gen_break(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeBreak);

    if (irb->loop_stack.length == 0) {
        add_node_error(irb->codegen, node,
            buf_sprintf("'break' expression outside loop"));
        return irb->codegen->invalid_instruction;
    }

    bool is_inline = ir_should_inline(irb) || node->data.break_expr.is_inline;
    LoopStackItem *loop_stack_item = &irb->loop_stack.last();
    IrBasicBlock *dest_block = loop_stack_item->break_block;
    ir_gen_defers_for_block(irb, scope, dest_block->scope, false, false);
    return ir_build_br(irb, scope, node, dest_block, is_inline);
}

static IrInstruction *ir_gen_continue(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeContinue);

    if (irb->loop_stack.length == 0) {
        add_node_error(irb->codegen, node,
            buf_sprintf("'continue' expression outside loop"));
        return irb->codegen->invalid_instruction;
    }

    bool is_inline = ir_should_inline(irb) || node->data.continue_expr.is_inline;
    LoopStackItem *loop_stack_item = &irb->loop_stack.last();
    IrBasicBlock *dest_block = loop_stack_item->continue_block;
    ir_gen_defers_for_block(irb, scope, dest_block->scope, false, false);
    return ir_build_br(irb, scope, node, dest_block, is_inline);
}

static IrInstruction *ir_gen_type_literal(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeTypeLiteral);
    return ir_build_const_type(irb, scope, node, irb->codegen->builtin_types.entry_type);
}

static IrInstruction *ir_gen_error_type(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeErrorType);
    return ir_build_const_type(irb, scope, node, irb->codegen->builtin_types.entry_pure_error);
}

static IrInstruction *ir_gen_defer(IrBuilder *irb, Scope *parent_scope, AstNode *node) {
    assert(node->type == NodeTypeDefer);

    ScopeDefer *defer_scope = create_defer_scope(node, parent_scope);
    node->data.defer.child_scope = &defer_scope->base;
    node->data.defer.parent_scope = parent_scope;

    return ir_build_const_void(irb, parent_scope, node);
}

static IrInstruction *ir_gen_slice(IrBuilder *irb, Scope *scope, AstNode *node) {
    assert(node->type == NodeTypeSliceExpr);

    AstNodeSliceExpr *slice_expr = &node->data.slice_expr;
    AstNode *array_node = slice_expr->array_ref_expr;
    AstNode *start_node = slice_expr->start;
    AstNode *end_node = slice_expr->end;

    IrInstruction *ptr_value = ir_gen_node(irb, array_node, scope);
    if (ptr_value == irb->codegen->invalid_instruction)
        return irb->codegen->invalid_instruction;

    IrInstruction *start_value = ir_gen_node(irb, start_node, scope);
    if (ptr_value == irb->codegen->invalid_instruction)
        return irb->codegen->invalid_instruction;

    IrInstruction *end_value;
    if (end_node) {
        end_value = ir_gen_node(irb, end_node, scope);
        if (end_value == irb->codegen->invalid_instruction)
            return irb->codegen->invalid_instruction;
    } else {
        end_value = nullptr;
    }

    return ir_build_slice(irb, scope, node, ptr_value, start_value, end_value, slice_expr->is_const);
}

static IrInstruction *ir_gen_node_raw(IrBuilder *irb, AstNode *node, Scope *scope,
        LValPurpose lval)
{
    assert(scope);
    switch (node->type) {
        case NodeTypeStructValueField:
        case NodeTypeRoot:
        case NodeTypeParamDecl:
        case NodeTypeUse:
        case NodeTypeSwitchProng:
        case NodeTypeSwitchRange:
            zig_unreachable();
        case NodeTypeBlock:
            return ir_lval_wrap(irb, scope, ir_gen_block(irb, scope, node), lval);
        case NodeTypeBinOpExpr:
            return ir_lval_wrap(irb, scope, ir_gen_bin_op(irb, scope, node), lval);
        case NodeTypeNumberLiteral:
            return ir_lval_wrap(irb, scope, ir_gen_num_lit(irb, scope, node), lval);
        case NodeTypeSymbol:
            return ir_gen_symbol(irb, scope, node, lval);
        case NodeTypeFnCallExpr:
            return ir_lval_wrap(irb, scope, ir_gen_fn_call(irb, scope, node), lval);
        case NodeTypeIfBoolExpr:
            return ir_lval_wrap(irb, scope, ir_gen_if_bool_expr(irb, scope, node), lval);
        case NodeTypePrefixOpExpr:
            return ir_gen_prefix_op_expr(irb, scope, node, lval);
        case NodeTypeContainerInitExpr:
            return ir_lval_wrap(irb, scope, ir_gen_container_init_expr(irb, scope, node), lval);
        case NodeTypeVariableDeclaration:
            return ir_lval_wrap(irb, scope, ir_gen_var_decl(irb, scope, node), lval);
        case NodeTypeWhileExpr:
            return ir_lval_wrap(irb, scope, ir_gen_while_expr(irb, scope, node), lval);
        case NodeTypeForExpr:
            return ir_lval_wrap(irb, scope, ir_gen_for_expr(irb, scope, node), lval);
        case NodeTypeArrayAccessExpr:
            return ir_gen_array_access(irb, scope, node, lval);
        case NodeTypeReturnExpr:
            return ir_lval_wrap(irb, scope, ir_gen_return(irb, scope, node), lval);
        case NodeTypeFieldAccessExpr:
            return ir_gen_field_access(irb, scope, node, lval);
        case NodeTypeThisLiteral:
            return ir_lval_wrap(irb, scope, ir_gen_this_literal(irb, scope, node), lval);
        case NodeTypeBoolLiteral:
            return ir_lval_wrap(irb, scope, ir_gen_bool_literal(irb, scope, node), lval);
        case NodeTypeArrayType:
            return ir_lval_wrap(irb, scope, ir_gen_array_type(irb, scope, node), lval);
        case NodeTypeStringLiteral:
            return ir_lval_wrap(irb, scope, ir_gen_string_literal(irb, scope, node), lval);
        case NodeTypeUndefinedLiteral:
            return ir_lval_wrap(irb, scope, ir_gen_undefined_literal(irb, scope, node), lval);
        case NodeTypeAsmExpr:
            return ir_lval_wrap(irb, scope, ir_gen_asm_expr(irb, scope, node), lval);
        case NodeTypeNullLiteral:
            return ir_lval_wrap(irb, scope, ir_gen_null_literal(irb, scope, node), lval);
        case NodeTypeIfVarExpr:
            return ir_lval_wrap(irb, scope, ir_gen_if_var_expr(irb, scope, node), lval);
        case NodeTypeSwitchExpr:
            return ir_lval_wrap(irb, scope, ir_gen_switch_expr(irb, scope, node), lval);
        case NodeTypeLabel:
            return ir_lval_wrap(irb, scope, ir_gen_label(irb, scope, node), lval);
        case NodeTypeGoto:
            return ir_lval_wrap(irb, scope, ir_gen_goto(irb, scope, node), lval);
        case NodeTypeTypeLiteral:
            return ir_lval_wrap(irb, scope, ir_gen_type_literal(irb, scope, node), lval);
        case NodeTypeErrorType:
            return ir_lval_wrap(irb, scope, ir_gen_error_type(irb, scope, node), lval);
        case NodeTypeBreak:
            return ir_lval_wrap(irb, scope, ir_gen_break(irb, scope, node), lval);
        case NodeTypeContinue:
            return ir_lval_wrap(irb, scope, ir_gen_continue(irb, scope, node), lval);
        case NodeTypeDefer:
            return ir_lval_wrap(irb, scope, ir_gen_defer(irb, scope, node), lval);
        case NodeTypeSliceExpr:
            return ir_lval_wrap(irb, scope, ir_gen_slice(irb, scope, node), lval);
        case NodeTypeUnwrapErrorExpr:
        case NodeTypeCharLiteral:
        case NodeTypeZeroesLiteral:
        case NodeTypeVarLiteral:
        case NodeTypeFnProto:
        case NodeTypeFnDef:
        case NodeTypeFnDecl:
        case NodeTypeContainerDecl:
        case NodeTypeStructField:
        case NodeTypeErrorValueDecl:
        case NodeTypeTypeDecl:
            zig_panic("TODO more IR gen for node types");
    }
    zig_unreachable();
}

static IrInstruction *ir_gen_node_extra(IrBuilder *irb, AstNode *node, Scope *scope,
        LValPurpose lval)
{
    IrInstruction *result = ir_gen_node_raw(irb, node, scope, lval);
    irb->exec->invalid = irb->exec->invalid || (result == irb->codegen->invalid_instruction);
    return result;
}

static IrInstruction *ir_gen_node(IrBuilder *irb, AstNode *node, Scope *scope) {
    return ir_gen_node_extra(irb, node, scope, LValPurposeNone);
}

static bool ir_goto_pass2(IrBuilder *irb) {
    for (size_t i = 0; i < irb->exec->goto_list.length; i += 1) {
        IrGotoItem *goto_item = &irb->exec->goto_list.at(i);
        AstNode *source_node = goto_item->source_node;

        // Since a goto will always end a basic block, we move the "current instruction"
        // index back to over the placeholder unreachable instruction and begin overwriting
        irb->current_basic_block = goto_item->bb;
        irb->current_basic_block->instruction_list.resize(goto_item->instruction_index);

        Buf *label_name = source_node->data.goto_expr.name;
        LabelTableEntry *label = find_label(irb->exec, goto_item->scope, label_name);
        if (!label) {
            add_node_error(irb->codegen, source_node,
                buf_sprintf("no label in scope named '%s'", buf_ptr(label_name)));
            return false;
        }
        label->used = true;

        bool is_inline = ir_should_inline(irb) || source_node->data.goto_expr.is_inline;
        ir_gen_defers_for_block(irb, goto_item->scope, label->bb->scope, false, false);
        ir_build_br(irb, goto_item->scope, source_node, label->bb, is_inline);
    }

    for (size_t i = 0; i < irb->exec->all_labels.length; i += 1) {
        LabelTableEntry *label = irb->exec->all_labels.at(i);
        if (!label->used) {
            add_node_error(irb->codegen, label->decl_node,
                    buf_sprintf("label '%s' defined but not used",
                        buf_ptr(label->decl_node->data.label.name)));
            return false;
        }
    }

    return true;
}

IrInstruction *ir_gen(CodeGen *codegen, AstNode *node, Scope *scope, IrExecutable *ir_executable) {
    assert(node->owner);

    IrBuilder ir_builder = {0};
    IrBuilder *irb = &ir_builder;

    irb->codegen = codegen;
    irb->exec = ir_executable;

    irb->current_basic_block = ir_build_basic_block(irb, scope, "Entry");
    // Entry block gets a reference because we enter it to begin.
    ir_ref_bb(irb->current_basic_block);

    IrInstruction *result = ir_gen_node_extra(irb, node, scope, LValPurposeNone);
    assert(result);
    if (irb->exec->invalid)
        return codegen->invalid_instruction;

    IrInstruction *return_instruction = ir_build_return(irb, scope, result->source_node, result);
    assert(return_instruction);

    if (!ir_goto_pass2(irb)) {
        irb->exec->invalid = true;
        return codegen->invalid_instruction;
    }

    return return_instruction;
}

IrInstruction *ir_gen_fn(CodeGen *codegen, FnTableEntry *fn_entry) {
    assert(fn_entry);

    IrExecutable *ir_executable = &fn_entry->ir_executable;
    AstNode *fn_def_node = fn_entry->fn_def_node;
    assert(fn_def_node->type == NodeTypeFnDef);

    AstNode *body_node = fn_def_node->data.fn_def.body;

    assert(fn_entry->child_scope);

    return ir_gen(codegen, body_node, fn_entry->child_scope, ir_executable);
}

static ErrorMsg *ir_add_error(IrAnalyze *ira, IrInstruction *source_instruction, Buf *msg) {
    ira->new_irb.exec->invalid = true;
    return add_node_error(ira->codegen, source_instruction->source_node, msg);
}

static IrInstruction *ir_exec_const_result(IrExecutable *exec) {
    if (exec->basic_block_list.length != 1)
        return nullptr;

    IrBasicBlock *bb = exec->basic_block_list.at(0);
    if (bb->instruction_list.length != 1)
        return nullptr;

    IrInstruction *only_inst = bb->instruction_list.at(0);
    if (only_inst->id != IrInstructionIdReturn)
        return nullptr;

    IrInstructionReturn *ret_inst = (IrInstructionReturn *)only_inst;
    IrInstruction *value = ret_inst->value;
    assert(value->static_value.special != ConstValSpecialRuntime);
    return value;
}

static bool ir_emit_global_runtime_side_effect(IrAnalyze *ira, IrInstruction *source_instruction) {
    if (ir_should_inline(&ira->new_irb)) {
        ir_add_error(ira, source_instruction, buf_sprintf("unable to evaluate constant expression"));
        return false;
    }
    return true;
}

static bool ir_num_lit_fits_in_other_type(IrAnalyze *ira, IrInstruction *instruction, TypeTableEntry *other_type) {
    TypeTableEntry *other_type_underlying = get_underlying_type(other_type);

    if (other_type_underlying->id == TypeTableEntryIdInvalid) {
        return false;
    }

    ConstExprValue *const_val = &instruction->static_value;
    assert(const_val->special != ConstValSpecialRuntime);
    if (other_type_underlying->id == TypeTableEntryIdFloat) {
        return true;
    } else if (other_type_underlying->id == TypeTableEntryIdInt &&
               const_val->data.x_bignum.kind == BigNumKindInt)
    {
        if (bignum_fits_in_bits(&const_val->data.x_bignum, other_type_underlying->data.integral.bit_count,
                    other_type_underlying->data.integral.is_signed))
        {
            return true;
        }
    } else if ((other_type_underlying->id == TypeTableEntryIdNumLitFloat &&
                const_val->data.x_bignum.kind == BigNumKindFloat) ||
               (other_type_underlying->id == TypeTableEntryIdNumLitInt &&
                const_val->data.x_bignum.kind == BigNumKindInt))
    {
        return true;
    }

    const char *num_lit_str = (const_val->data.x_bignum.kind == BigNumKindFloat) ? "float" : "integer";

    ir_add_error(ira, instruction,
        buf_sprintf("%s value %s cannot be implicitly casted to type '%s'",
            num_lit_str,
            buf_ptr(bignum_to_buf(&const_val->data.x_bignum)),
            buf_ptr(&other_type->name)));
    return false;
}

static TypeTableEntry *ir_determine_peer_types(IrAnalyze *ira, AstNode *source_node,
        IrInstruction **instructions, size_t instruction_count)
{
    assert(instruction_count >= 1);
    IrInstruction *prev_inst = instructions[0];
    if (prev_inst->type_entry->id == TypeTableEntryIdInvalid) {
        return ira->codegen->builtin_types.entry_invalid;
    }
    bool any_are_pure_error = (prev_inst->type_entry->id == TypeTableEntryIdPureError);
    for (size_t i = 1; i < instruction_count; i += 1) {
        IrInstruction *cur_inst = instructions[i];
        TypeTableEntry *cur_type = cur_inst->type_entry;
        TypeTableEntry *prev_type = prev_inst->type_entry;
        if (cur_type->id == TypeTableEntryIdInvalid) {
            return cur_type;
        } else if (prev_type->id == TypeTableEntryIdPureError) {
            prev_inst = cur_inst;
            continue;
        } else if (cur_type->id == TypeTableEntryIdPureError) {
            any_are_pure_error = true;
            continue;
        } else if (types_match_const_cast_only(prev_type, cur_type)) {
            continue;
        } else if (types_match_const_cast_only(cur_type, prev_type)) {
            prev_inst = cur_inst;
            continue;
        } else if (prev_type->id == TypeTableEntryIdUnreachable) {
            prev_inst = cur_inst;
        } else if (cur_type->id == TypeTableEntryIdUnreachable) {
            continue;
        } else if (prev_type->id == TypeTableEntryIdInt &&
                   cur_type->id == TypeTableEntryIdInt &&
                   prev_type->data.integral.is_signed == cur_type->data.integral.is_signed)
        {
            if (cur_type->data.integral.bit_count > prev_type->data.integral.bit_count) {
                prev_inst = cur_inst;
            }
            continue;
        } else if (prev_type->id == TypeTableEntryIdFloat &&
                   cur_type->id == TypeTableEntryIdFloat)
        {
            if (cur_type->data.floating.bit_count > prev_type->data.floating.bit_count) {
                prev_inst = cur_inst;
            }
        } else if (prev_type->id == TypeTableEntryIdErrorUnion &&
                   types_match_const_cast_only(prev_type->data.error.child_type, cur_type))
        {
            continue;
        } else if (cur_type->id == TypeTableEntryIdErrorUnion &&
                   types_match_const_cast_only(cur_type->data.error.child_type, prev_type))
        {
            prev_inst = cur_inst;
            continue;
        } else if (prev_type->id == TypeTableEntryIdNumLitInt ||
                    prev_type->id == TypeTableEntryIdNumLitFloat)
        {
            if (ir_num_lit_fits_in_other_type(ira, prev_inst, cur_type)) {
                prev_inst = cur_inst;
                continue;
            } else {
                return ira->codegen->builtin_types.entry_invalid;
            }
        } else if (cur_type->id == TypeTableEntryIdNumLitInt ||
                   cur_type->id == TypeTableEntryIdNumLitFloat)
        {
            if (ir_num_lit_fits_in_other_type(ira, cur_inst, prev_type)) {
                continue;
            } else {
                return ira->codegen->builtin_types.entry_invalid;
            }
        } else {
            add_node_error(ira->codegen, source_node,
                buf_sprintf("incompatible types: '%s' and '%s'",
                    buf_ptr(&prev_type->name), buf_ptr(&cur_type->name)));

            return ira->codegen->builtin_types.entry_invalid;
        }
    }
    if (any_are_pure_error && prev_inst->type_entry->id != TypeTableEntryIdPureError) {
        if (prev_inst->type_entry->id == TypeTableEntryIdNumLitInt ||
            prev_inst->type_entry->id == TypeTableEntryIdNumLitFloat)
        {
            add_node_error(ira->codegen, source_node,
                buf_sprintf("unable to make error union out of number literal"));
            return ira->codegen->builtin_types.entry_invalid;
        } else {
            return get_error_type(ira->codegen, prev_inst->type_entry);
        }
    } else {
        return prev_inst->type_entry;
    }
}

enum ImplicitCastMatchResult {
    ImplicitCastMatchResultNo,
    ImplicitCastMatchResultYes,
    ImplicitCastMatchResultReportedError,
};

static ImplicitCastMatchResult ir_types_match_with_implicit_cast(IrAnalyze *ira, TypeTableEntry *expected_type,
        TypeTableEntry *actual_type, IrInstruction *value)
{
    if (types_match_const_cast_only(expected_type, actual_type)) {
        return ImplicitCastMatchResultYes;
    }

    // implicit conversion from non maybe type to maybe type
    if (expected_type->id == TypeTableEntryIdMaybe &&
        ir_types_match_with_implicit_cast(ira, expected_type->data.maybe.child_type, actual_type, value))
    {
        return ImplicitCastMatchResultYes;
    }

    // implicit conversion from null literal to maybe type
    if (expected_type->id == TypeTableEntryIdMaybe &&
        actual_type->id == TypeTableEntryIdNullLit)
    {
        return ImplicitCastMatchResultYes;
    }

    // implicit conversion from error child type to error type
    if (expected_type->id == TypeTableEntryIdErrorUnion &&
        ir_types_match_with_implicit_cast(ira, expected_type->data.error.child_type, actual_type, value))
    {
        return ImplicitCastMatchResultYes;
    }

    // implicit conversion from pure error to error union type
    if (expected_type->id == TypeTableEntryIdErrorUnion &&
        actual_type->id == TypeTableEntryIdPureError)
    {
        return ImplicitCastMatchResultYes;
    }

    // implicit widening conversion
    if (expected_type->id == TypeTableEntryIdInt &&
        actual_type->id == TypeTableEntryIdInt &&
        expected_type->data.integral.is_signed == actual_type->data.integral.is_signed &&
        expected_type->data.integral.bit_count >= actual_type->data.integral.bit_count)
    {
        return ImplicitCastMatchResultYes;
    }

    // small enough unsigned ints can get casted to large enough signed ints
    if (expected_type->id == TypeTableEntryIdInt && expected_type->data.integral.is_signed &&
        actual_type->id == TypeTableEntryIdInt && !actual_type->data.integral.is_signed &&
        expected_type->data.integral.bit_count > actual_type->data.integral.bit_count)
    {
        return ImplicitCastMatchResultYes;
    }

    // implicit float widening conversion
    if (expected_type->id == TypeTableEntryIdFloat &&
        actual_type->id == TypeTableEntryIdFloat &&
        expected_type->data.floating.bit_count >= actual_type->data.floating.bit_count)
    {
        return ImplicitCastMatchResultYes;
    }

    // implicit array to slice conversion
    if (expected_type->id == TypeTableEntryIdStruct &&
        expected_type->data.structure.is_slice &&
        actual_type->id == TypeTableEntryIdArray &&
        types_match_const_cast_only(
            expected_type->data.structure.fields[0].type_entry->data.pointer.child_type,
            actual_type->data.array.child_type))
    {
        return ImplicitCastMatchResultYes;
    }

    // implicit number literal to typed number
    if ((actual_type->id == TypeTableEntryIdNumLitFloat ||
         actual_type->id == TypeTableEntryIdNumLitInt))
    {
        if (ir_num_lit_fits_in_other_type(ira, value, expected_type)) {
            return ImplicitCastMatchResultYes;
        } else {
            return ImplicitCastMatchResultReportedError;
        }
    }

    // implicit undefined literal to anything
    if (actual_type->id == TypeTableEntryIdUndefLit) {
        return ImplicitCastMatchResultYes;
    }


    return ImplicitCastMatchResultNo;
}

static TypeTableEntry *ir_resolve_peer_types(IrAnalyze *ira, AstNode *source_node,
        IrInstruction **instructions, size_t instruction_count)
{
    return ir_determine_peer_types(ira, source_node, instructions, instruction_count);
}

static void ir_add_alloca(IrAnalyze *ira, IrInstruction *instruction, TypeTableEntry *type_entry) {
    if (type_has_bits(type_entry) && handle_is_ptr(type_entry)) {
        FnTableEntry *fn_entry = exec_fn_entry(ira->new_irb.exec);
        assert(fn_entry);
        fn_entry->alloca_list.append(instruction);
    }
}

static IrInstruction *ir_resolve_cast(IrAnalyze *ira, IrInstruction *source_instr, IrInstruction *value,
        TypeTableEntry *wanted_type, CastOp cast_op, bool need_alloca)
{
    if (value->static_value.special != ConstValSpecialRuntime) {
        IrInstruction *result = ir_create_const(&ira->new_irb, source_instr->scope, source_instr->source_node, wanted_type, false);
        eval_const_expr_implicit_cast(cast_op, &value->static_value, value->type_entry,
                &result->static_value, wanted_type);
        return result;
    } else {
        IrInstruction *result = ir_build_cast(&ira->new_irb, source_instr->scope, source_instr->source_node, wanted_type, value, cast_op);
        result->type_entry = wanted_type;
        if (need_alloca) {
            FnTableEntry *fn_entry = exec_fn_entry(ira->new_irb.exec);
            if (fn_entry)
                fn_entry->alloca_list.append(result);
        }
        return result;
    }
}

static bool is_slice(TypeTableEntry *type) {
    return type->id == TypeTableEntryIdStruct && type->data.structure.is_slice;
}

static bool is_container(TypeTableEntry *type) {
    return type->id == TypeTableEntryIdStruct ||
        type->id == TypeTableEntryIdEnum ||
        type->id == TypeTableEntryIdUnion;
}

static bool is_u8(TypeTableEntry *type) {
    return type->id == TypeTableEntryIdInt &&
        !type->data.integral.is_signed && type->data.integral.bit_count == 8;
}

static IrBasicBlock *ir_get_new_bb(IrAnalyze *ira, IrBasicBlock *old_bb) {
    if (old_bb->other)
        return old_bb->other;
    IrBasicBlock *new_bb = ir_build_bb_from(&ira->new_irb, old_bb);

    // We are about to enqueue old_bb for analysis. Before we do so, check old_bb
    // for phi instructions. Any incoming blocks in the phi instructions need to be
    // queued first.
    for (size_t instr_i = 0; instr_i < old_bb->instruction_list.length; instr_i += 1) {
        IrInstruction *instruction = old_bb->instruction_list.at(instr_i);
        if (instruction->id != IrInstructionIdPhi)
            break;
        IrInstructionPhi *phi_instruction = (IrInstructionPhi *)instruction;
        for (size_t incoming_i = 0; incoming_i < phi_instruction->incoming_count; incoming_i += 1) {
            IrBasicBlock *predecessor = phi_instruction->incoming_blocks[incoming_i];
            ir_get_new_bb(ira, predecessor);
        }
    }
    ira->old_bb_queue.append(old_bb);

    return new_bb;
}

static void ir_start_bb(IrAnalyze *ira, IrBasicBlock *old_bb, IrBasicBlock *const_predecessor_bb) {
    ira->instruction_index = 0;
    ira->old_irb.current_basic_block = old_bb;
    ira->const_predecessor_bb = const_predecessor_bb;

    if (old_bb->other)
        ira->new_irb.exec->basic_block_list.append(old_bb->other);
}

static void ir_finish_bb(IrAnalyze *ira) {
    ira->block_queue_index += 1;

    if (ira->block_queue_index < ira->old_bb_queue.length) {
        IrBasicBlock *old_bb = ira->old_bb_queue.at(ira->block_queue_index);
        ira->new_irb.current_basic_block = ir_get_new_bb(ira, old_bb);

        ir_start_bb(ira, old_bb, nullptr);
    }
}

static TypeTableEntry *ir_unreach_error(IrAnalyze *ira) {
    ira->block_queue_index = SIZE_MAX;
    ira->new_irb.exec->invalid = true;
    return ira->codegen->builtin_types.entry_unreachable;
}

static bool ir_emit_backward_branch(IrAnalyze *ira, IrInstruction *source_instruction) {
    size_t *bbc = ira->new_irb.exec->backward_branch_count;
    size_t quota = ira->new_irb.exec->backward_branch_quota;

    // If we're already over quota, we've already given an error message for this.
    if (*bbc > quota)
        return false;

    *bbc += 1;
    if (*bbc > quota) {
        ir_add_error(ira, source_instruction, buf_sprintf("evaluation exceeded %zu backwards branches", quota));
        return false;
    }
    return true;
}

static TypeTableEntry *ir_inline_bb(IrAnalyze *ira, IrInstruction *source_instruction, IrBasicBlock *old_bb) {
    if (old_bb->debug_id <= ira->old_irb.current_basic_block->debug_id) {
        if (!ir_emit_backward_branch(ira, source_instruction))
            return ir_unreach_error(ira);
    }

    ir_start_bb(ira, old_bb, ira->old_irb.current_basic_block);
    return ira->codegen->builtin_types.entry_unreachable;
}

static TypeTableEntry *ir_finish_anal(IrAnalyze *ira, TypeTableEntry *result_type) {
    if (result_type->id == TypeTableEntryIdUnreachable)
        ir_finish_bb(ira);
    return result_type;
}

static ConstExprValue *ir_build_const_from(IrAnalyze *ira, IrInstruction *old_instruction,
        bool depends_on_compile_var)
{
    IrInstruction *new_instruction;
    if (old_instruction->id == IrInstructionIdVarPtr) {
        IrInstructionVarPtr *old_var_ptr_instruction = (IrInstructionVarPtr *)old_instruction;
        IrInstructionVarPtr *var_ptr_instruction = ir_create_instruction<IrInstructionVarPtr>(ira->new_irb.exec,
                old_instruction->scope, old_instruction->source_node);
        var_ptr_instruction->var = old_var_ptr_instruction->var;
        new_instruction = &var_ptr_instruction->base;
    } else if (old_instruction->id == IrInstructionIdFieldPtr) {
        IrInstructionFieldPtr *field_ptr_instruction = ir_create_instruction<IrInstructionFieldPtr>(ira->new_irb.exec,
                old_instruction->scope, old_instruction->source_node);
        new_instruction = &field_ptr_instruction->base;
    } else if (old_instruction->id == IrInstructionIdElemPtr) {
        IrInstructionElemPtr *elem_ptr_instruction = ir_create_instruction<IrInstructionElemPtr>(ira->new_irb.exec,
                old_instruction->scope, old_instruction->source_node);
        new_instruction = &elem_ptr_instruction->base;
    } else {
        IrInstructionConst *const_instruction = ir_create_instruction<IrInstructionConst>(ira->new_irb.exec,
                old_instruction->scope, old_instruction->source_node);
        new_instruction = &const_instruction->base;
    }
    ir_link_new_instruction(new_instruction, old_instruction);
    ConstExprValue *const_val = &new_instruction->static_value;
    const_val->special = ConstValSpecialStatic;
    const_val->depends_on_compile_var = depends_on_compile_var;
    return const_val;
}

static TypeTableEntry *ir_analyze_void(IrAnalyze *ira, IrInstruction *instruction) {
    ir_build_const_from(ira, instruction, false);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_const_ptr(IrAnalyze *ira, IrInstruction *instruction,
        ConstExprValue *pointee, TypeTableEntry *pointee_type, bool depends_on_compile_var,
        ConstPtrSpecial special)
{
    TypeTableEntry *ptr_type = get_pointer_to_type(ira->codegen, pointee_type, true);
    ConstExprValue *const_val = ir_build_const_from(ira, instruction,
            depends_on_compile_var || pointee->depends_on_compile_var);
    const_val->data.x_ptr.base_ptr = pointee;
    const_val->data.x_ptr.index = SIZE_MAX;
    const_val->data.x_ptr.special = special;
    return ptr_type;
}

static TypeTableEntry *ir_analyze_const_usize(IrAnalyze *ira, IrInstruction *instruction, uint64_t value,
    bool depends_on_compile_var)
{
    ConstExprValue *const_val = ir_build_const_from(ira, instruction, depends_on_compile_var);
    bignum_init_unsigned(&const_val->data.x_bignum, value);
    return ira->codegen->builtin_types.entry_usize;
}

static ConstExprValue *ir_resolve_const(IrAnalyze *ira, IrInstruction *value) {
    if (value->static_value.special != ConstValSpecialStatic) {
        ir_add_error(ira, value, buf_sprintf("unable to evaluate constant expression"));
        return nullptr;
    }
    return &value->static_value;
}

IrInstruction *ir_eval_const_value(CodeGen *codegen, Scope *scope, AstNode *node,
        TypeTableEntry *expected_type, size_t *backward_branch_count, size_t backward_branch_quota,
        FnTableEntry *fn_entry, Buf *c_import_buf)
{
    IrExecutable ir_executable = {0};
    ir_executable.is_inline = true;
    ir_executable.fn_entry = fn_entry;
    ir_executable.c_import_buf = c_import_buf;
    ir_gen(codegen, node, scope, &ir_executable);

    if (ir_executable.invalid)
        return codegen->invalid_instruction;

    if (codegen->verbose) {
        fprintf(stderr, "\nSource: ");
        ast_render(stderr, node, 4);
        fprintf(stderr, "\n{ // (IR)\n");
        ir_print(stderr, &ir_executable, 4);
        fprintf(stderr, "}\n");
    }
    IrExecutable analyzed_executable = {0};
    analyzed_executable.is_inline = true;
    analyzed_executable.fn_entry = fn_entry;
    analyzed_executable.c_import_buf = c_import_buf;
    analyzed_executable.backward_branch_count = backward_branch_count;
    analyzed_executable.backward_branch_quota = backward_branch_quota;
    TypeTableEntry *result_type = ir_analyze(codegen, &ir_executable, &analyzed_executable, expected_type, node);
    if (result_type->id == TypeTableEntryIdInvalid)
        return codegen->invalid_instruction;

    if (codegen->verbose) {
        fprintf(stderr, "{ // (analyzed)\n");
        ir_print(stderr, &analyzed_executable, 4);
        fprintf(stderr, "}\n");
    }

    IrInstruction *result = ir_exec_const_result(&analyzed_executable);
    if (!result) {
        add_node_error(codegen, node, buf_sprintf("unable to evaluate constant expression"));
        return codegen->invalid_instruction;
    }

    return result;
}

static TypeTableEntry *ir_resolve_type_lval(IrAnalyze *ira, IrInstruction *type_value, LValPurpose lval) {
    if (lval != LValPurposeNone)
        zig_panic("TODO");

    if (type_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    if (type_value->type_entry->id != TypeTableEntryIdMetaType) {
        add_node_error(ira->codegen, type_value->source_node,
                buf_sprintf("expected type 'type', found '%s'", buf_ptr(&type_value->type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    ConstExprValue *const_val = ir_resolve_const(ira, type_value);
    if (!const_val)
        return ira->codegen->builtin_types.entry_invalid;

    return const_val->data.x_type;
}

static TypeTableEntry *ir_resolve_type(IrAnalyze *ira, IrInstruction *type_value) {
    return ir_resolve_type_lval(ira, type_value, LValPurposeNone);
}

static FnTableEntry *ir_resolve_fn(IrAnalyze *ira, IrInstruction *fn_value) {
    if (fn_value == ira->codegen->invalid_instruction)
        return nullptr;

    if (fn_value->type_entry->id == TypeTableEntryIdInvalid)
        return nullptr;

    if (fn_value->type_entry->id != TypeTableEntryIdFn) {
        add_node_error(ira->codegen, fn_value->source_node,
                buf_sprintf("expected function type, found '%s'", buf_ptr(&fn_value->type_entry->name)));
        return nullptr;
    }

    ConstExprValue *const_val = ir_resolve_const(ira, fn_value);
    if (!const_val)
        return nullptr;

    return const_val->data.x_fn;
}

static IrInstruction *ir_analyze_cast(IrAnalyze *ira, IrInstruction *source_instr,
    TypeTableEntry *wanted_type, IrInstruction *value)
{
    TypeTableEntry *actual_type = value->type_entry;
    TypeTableEntry *wanted_type_canon = get_underlying_type(wanted_type);
    TypeTableEntry *actual_type_canon = get_underlying_type(actual_type);

    TypeTableEntry *isize_type = ira->codegen->builtin_types.entry_isize;
    TypeTableEntry *usize_type = ira->codegen->builtin_types.entry_usize;

    if (wanted_type_canon->id == TypeTableEntryIdInvalid ||
        actual_type_canon->id == TypeTableEntryIdInvalid)
    {
        return ira->codegen->invalid_instruction;
    }

    // explicit match or non-const to const
    if (types_match_const_cast_only(wanted_type, actual_type)) {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpNoop, false);
    }

    // explicit cast from bool to int
    if (wanted_type_canon->id == TypeTableEntryIdInt &&
        actual_type_canon->id == TypeTableEntryIdBool)
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpBoolToInt, false);
    }

    // explicit cast from pointer to isize or usize
    if ((wanted_type_canon == isize_type || wanted_type_canon == usize_type) &&
        type_is_codegen_pointer(actual_type_canon))
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpPtrToInt, false);
    }


    // explicit cast from isize or usize to pointer
    if (wanted_type_canon->id == TypeTableEntryIdPointer &&
        (actual_type_canon == isize_type || actual_type_canon == usize_type))
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpIntToPtr, false);
    }

    // explicit widening or shortening cast
    if ((wanted_type_canon->id == TypeTableEntryIdInt &&
        actual_type_canon->id == TypeTableEntryIdInt) ||
        (wanted_type_canon->id == TypeTableEntryIdFloat &&
        actual_type_canon->id == TypeTableEntryIdFloat))
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpWidenOrShorten, false);
    }

    // explicit cast from int to float
    if (wanted_type_canon->id == TypeTableEntryIdFloat &&
        actual_type_canon->id == TypeTableEntryIdInt)
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpIntToFloat, false);
    }

    // explicit cast from float to int
    if (wanted_type_canon->id == TypeTableEntryIdInt &&
        actual_type_canon->id == TypeTableEntryIdFloat)
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpFloatToInt, false);
    }

    // explicit cast from array to slice
    if (is_slice(wanted_type) &&
        actual_type->id == TypeTableEntryIdArray &&
        types_match_const_cast_only(
            wanted_type->data.structure.fields[0].type_entry->data.pointer.child_type,
            actual_type->data.array.child_type))
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpToUnknownSizeArray, true);
    }

    // explicit cast from []T to []u8 or []u8 to []T
    if (is_slice(wanted_type) && is_slice(actual_type) &&
        (is_u8(wanted_type->data.structure.fields[0].type_entry->data.pointer.child_type) ||
        is_u8(actual_type->data.structure.fields[0].type_entry->data.pointer.child_type)) &&
        (wanted_type->data.structure.fields[0].type_entry->data.pointer.is_const ||
         !actual_type->data.structure.fields[0].type_entry->data.pointer.is_const))
    {
        if (!ir_emit_global_runtime_side_effect(ira, source_instr))
            return ira->codegen->invalid_instruction;
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpResizeSlice, true);
    }

    // explicit cast from [N]u8 to []T
    if (is_slice(wanted_type) &&
        actual_type->id == TypeTableEntryIdArray &&
        is_u8(actual_type->data.array.child_type))
    {
        if (!ir_emit_global_runtime_side_effect(ira, source_instr))
            return ira->codegen->invalid_instruction;
        uint64_t child_type_size = type_size(ira->codegen,
                wanted_type->data.structure.fields[0].type_entry->data.pointer.child_type);
        if (actual_type->data.array.len % child_type_size == 0) {
            return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpBytesToSlice, true);
        } else {
            add_node_error(ira->codegen, source_instr->source_node,
                    buf_sprintf("unable to convert %s to %s: size mismatch",
                        buf_ptr(&actual_type->name), buf_ptr(&wanted_type->name)));
            return ira->codegen->invalid_instruction;
        }
    }

    // explicit cast from pointer to another pointer
    if ((actual_type->id == TypeTableEntryIdPointer || actual_type->id == TypeTableEntryIdFn) &&
        (wanted_type->id == TypeTableEntryIdPointer || wanted_type->id == TypeTableEntryIdFn))
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpPointerReinterpret, false);
    }

    // explicit cast from maybe pointer to another maybe pointer
    if (actual_type->id == TypeTableEntryIdMaybe &&
        (actual_type->data.maybe.child_type->id == TypeTableEntryIdPointer ||
            actual_type->data.maybe.child_type->id == TypeTableEntryIdFn) &&
        wanted_type->id == TypeTableEntryIdMaybe &&
        (wanted_type->data.maybe.child_type->id == TypeTableEntryIdPointer ||
            wanted_type->data.maybe.child_type->id == TypeTableEntryIdFn))
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpPointerReinterpret, false);
    }

    // explicit cast from child type of maybe type to maybe type
    if (wanted_type->id == TypeTableEntryIdMaybe) {
        if (types_match_const_cast_only(wanted_type->data.maybe.child_type, actual_type)) {
            IrInstruction *cast_instruction = ir_resolve_cast(ira, source_instr, value, wanted_type,
                    CastOpMaybeWrap, true);
            cast_instruction->return_knowledge = ReturnKnowledgeKnownNonNull;
            return cast_instruction;
        } else if (actual_type->id == TypeTableEntryIdNumLitInt ||
                   actual_type->id == TypeTableEntryIdNumLitFloat)
        {
            if (ir_num_lit_fits_in_other_type(ira, value, wanted_type->data.maybe.child_type)) {
                IrInstruction *cast_instruction = ir_resolve_cast(ira, source_instr, value, wanted_type,
                        CastOpMaybeWrap, true);
                cast_instruction->return_knowledge = ReturnKnowledgeKnownNonNull;
                return cast_instruction;
            } else {
                return ira->codegen->invalid_instruction;
            }
        }
    }

    // explicit cast from null literal to maybe type
    if (wanted_type->id == TypeTableEntryIdMaybe &&
        actual_type->id == TypeTableEntryIdNullLit)
    {
        IrInstruction *cast_instruction = ir_resolve_cast(ira, source_instr, value, wanted_type,
                CastOpNullToMaybe, true);
        cast_instruction->return_knowledge = ReturnKnowledgeKnownNull;
        return cast_instruction;
    }

    // explicit cast from child type of error type to error type
    if (wanted_type->id == TypeTableEntryIdErrorUnion) {
        if (types_match_const_cast_only(wanted_type->data.error.child_type, actual_type)) {
            IrInstruction *cast_instruction = ir_resolve_cast(ira, source_instr, value, wanted_type,
                    CastOpErrorWrap, true);
            cast_instruction->return_knowledge = ReturnKnowledgeKnownNonError;
            return cast_instruction;
        } else if (actual_type->id == TypeTableEntryIdNumLitInt ||
                   actual_type->id == TypeTableEntryIdNumLitFloat)
        {
            if (ir_num_lit_fits_in_other_type(ira, value, wanted_type->data.error.child_type)) {
                IrInstruction *cast_instruction = ir_resolve_cast(ira, source_instr, value, wanted_type,
                        CastOpErrorWrap, true);
                cast_instruction->return_knowledge = ReturnKnowledgeKnownNonError;
                return cast_instruction;
            } else {
                return ira->codegen->invalid_instruction;
            }
        }
    }

    // explicit cast from pure error to error union type
    if (wanted_type->id == TypeTableEntryIdErrorUnion &&
        actual_type->id == TypeTableEntryIdPureError)
    {
        IrInstruction *cast_instruction = ir_resolve_cast(ira, source_instr, value, wanted_type,
                CastOpPureErrorWrap, false);
        cast_instruction->return_knowledge = ReturnKnowledgeKnownError;
        return cast_instruction;
    }

    // explicit cast from number literal to another type
    if (actual_type->id == TypeTableEntryIdNumLitFloat ||
        actual_type->id == TypeTableEntryIdNumLitInt)
    {
        if (ir_num_lit_fits_in_other_type(ira, value, wanted_type_canon)) {
            CastOp op;
            if ((actual_type->id == TypeTableEntryIdNumLitFloat &&
                 wanted_type_canon->id == TypeTableEntryIdFloat) ||
                (actual_type->id == TypeTableEntryIdNumLitInt &&
                 wanted_type_canon->id == TypeTableEntryIdInt))
            {
                op = CastOpNoop;
            } else if (wanted_type_canon->id == TypeTableEntryIdInt) {
                op = CastOpFloatToInt;
            } else if (wanted_type_canon->id == TypeTableEntryIdFloat) {
                op = CastOpIntToFloat;
            } else {
                zig_unreachable();
            }
            return ir_resolve_cast(ira, source_instr, value, wanted_type, op, false);
        } else {
            return ira->codegen->invalid_instruction;
        }
    }

    // explicit cast from %void to integer type which can fit it
    bool actual_type_is_void_err = actual_type->id == TypeTableEntryIdErrorUnion &&
        !type_has_bits(actual_type->data.error.child_type);
    bool actual_type_is_pure_err = actual_type->id == TypeTableEntryIdPureError;
    if ((actual_type_is_void_err || actual_type_is_pure_err) &&
        wanted_type->id == TypeTableEntryIdInt)
    {
        BigNum bn;
        bignum_init_unsigned(&bn, ira->codegen->error_decls.length);
        if (bignum_fits_in_bits(&bn, wanted_type->data.integral.bit_count,
                    wanted_type->data.integral.is_signed))
        {
            return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpErrToInt, false);
        } else {
            add_node_error(ira->codegen, source_instr->source_node,
                    buf_sprintf("too many error values to fit in '%s'", buf_ptr(&wanted_type->name)));
            return ira->codegen->invalid_instruction;
        }
    }

    // explicit cast from integer to enum type with no payload
    if (actual_type->id == TypeTableEntryIdInt &&
        wanted_type->id == TypeTableEntryIdEnum &&
        wanted_type->data.enumeration.gen_field_count == 0)
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpIntToEnum, false);
    }

    // explicit cast from enum type with no payload to integer
    if (wanted_type->id == TypeTableEntryIdInt &&
        actual_type->id == TypeTableEntryIdEnum &&
        actual_type->data.enumeration.gen_field_count == 0)
    {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpEnumToInt, false);
    }

    // explicit cast from undefined to anything
    if (actual_type->id == TypeTableEntryIdUndefLit) {
        return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpNoop, false);
    }

    add_node_error(ira->codegen, source_instr->source_node,
        buf_sprintf("invalid cast from type '%s' to '%s'",
            buf_ptr(&actual_type->name),
            buf_ptr(&wanted_type->name)));
    return ira->codegen->invalid_instruction;
}

static IrInstruction *ir_implicit_cast(IrAnalyze *ira, IrInstruction *value, TypeTableEntry *expected_type) {
    assert(value);
    assert(value != ira->codegen->invalid_instruction);
    assert(!expected_type || expected_type->id != TypeTableEntryIdInvalid);
    assert(value->type_entry);
    assert(value->type_entry->id != TypeTableEntryIdInvalid);
    if (expected_type == nullptr)
        return value; // anything will do
    if (expected_type == value->type_entry)
        return value; // match
    if (value->type_entry->id == TypeTableEntryIdUnreachable)
        return value;

    ImplicitCastMatchResult result = ir_types_match_with_implicit_cast(ira, expected_type, value->type_entry, value);
    switch (result) {
        case ImplicitCastMatchResultNo:
            add_node_error(ira->codegen, first_executing_node(value->source_node),
                buf_sprintf("expected type '%s', found '%s'",
                    buf_ptr(&expected_type->name),
                    buf_ptr(&value->type_entry->name)));
            return ira->codegen->invalid_instruction;

        case ImplicitCastMatchResultYes:
            return ir_analyze_cast(ira, value, expected_type, value);
        case ImplicitCastMatchResultReportedError:
            return ira->codegen->invalid_instruction;
    }

    zig_unreachable();
}

static IrInstruction *ir_get_deref(IrAnalyze *ira, IrInstruction *source_instruction, IrInstruction *ptr) {
    TypeTableEntry *type_entry = ptr->type_entry;
    if (type_entry->id == TypeTableEntryIdInvalid) {
        return ira->codegen->invalid_instruction;
    } else if (type_entry->id == TypeTableEntryIdPointer) {
        TypeTableEntry *child_type = type_entry->data.pointer.child_type;
        if (ptr->static_value.special != ConstValSpecialRuntime) {
            ConstExprValue *pointee = const_ptr_pointee(&ptr->static_value);
            if (pointee->special != ConstValSpecialRuntime) {
                IrInstruction *result = ir_create_const(&ira->new_irb, source_instruction->scope,
                    source_instruction->source_node, child_type, pointee->depends_on_compile_var);
                result->static_value = *pointee;
                return result;
            }
        }
        IrInstruction *load_ptr_instruction = ir_build_load_ptr(&ira->new_irb, source_instruction->scope, source_instruction->source_node, ptr);
        load_ptr_instruction->type_entry = child_type;
        return load_ptr_instruction;
    } else {
        add_node_error(ira->codegen, source_instruction->source_node,
            buf_sprintf("attempt to dereference non pointer type '%s'",
                buf_ptr(&type_entry->name)));
        return ira->codegen->invalid_instruction;
    }
}

static TypeTableEntry *ir_analyze_ref(IrAnalyze *ira, IrInstruction *source_instruction, IrInstruction *value) {
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    bool is_inline = ir_should_inline(&ira->new_irb);
    if (is_inline || value->static_value.special != ConstValSpecialRuntime) {
        ConstExprValue *val = ir_resolve_const(ira, value);
        if (!val)
            return ira->codegen->builtin_types.entry_invalid;
        return ir_analyze_const_ptr(ira, source_instruction, val, value->type_entry, false, ConstPtrSpecialNone);
    }

    TypeTableEntry *ptr_type = get_pointer_to_type(ira->codegen, value->type_entry, true);
    FnTableEntry *fn_entry = exec_fn_entry(ira->new_irb.exec);
    assert(fn_entry);
    IrInstruction *new_instruction = ir_build_ref_from(&ira->new_irb, source_instruction, value);
    fn_entry->alloca_list.append(new_instruction);
    return ptr_type;
}


static bool ir_resolve_usize(IrAnalyze *ira, IrInstruction *value, uint64_t *out) {
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return false;

    IrInstruction *casted_value = ir_implicit_cast(ira, value, ira->codegen->builtin_types.entry_usize);
    if (casted_value->type_entry->id == TypeTableEntryIdInvalid)
        return false;

    ConstExprValue *const_val = ir_resolve_const(ira, casted_value);
    if (!const_val)
        return false;

    *out = const_val->data.x_bignum.data.x_uint;
    return true;
}

static bool ir_resolve_bool(IrAnalyze *ira, IrInstruction *value, bool *out) {
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return false;

    IrInstruction *casted_value = ir_implicit_cast(ira, value, ira->codegen->builtin_types.entry_bool);
    if (casted_value->type_entry->id == TypeTableEntryIdInvalid)
        return false;

    ConstExprValue *const_val = ir_resolve_const(ira, casted_value);
    if (!const_val)
        return false;

    *out = const_val->data.x_bool;
    return true;
}

static bool ir_resolve_atomic_order(IrAnalyze *ira, IrInstruction *value, AtomicOrder *out) {
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return false;

    IrInstruction *casted_value = ir_implicit_cast(ira, value, ira->codegen->builtin_types.entry_atomic_order_enum);
    if (casted_value->type_entry->id == TypeTableEntryIdInvalid)
        return false;

    ConstExprValue *const_val = ir_resolve_const(ira, casted_value);
    if (!const_val)
        return false;

    *out = (AtomicOrder)const_val->data.x_enum.tag;
    return true;
}

static Buf *ir_resolve_str(IrAnalyze *ira, IrInstruction *value) {
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return nullptr;

    TypeTableEntry *str_type = get_slice_type(ira->codegen, ira->codegen->builtin_types.entry_u8, true);
    IrInstruction *casted_value = ir_implicit_cast(ira, value, str_type);
    if (casted_value->type_entry->id == TypeTableEntryIdInvalid)
        return nullptr;

    ConstExprValue *const_val = ir_resolve_const(ira, casted_value);
    if (!const_val)
        return nullptr;

    ConstExprValue *ptr_field = &const_val->data.x_struct.fields[slice_ptr_index];
    ConstExprValue *len_field = &const_val->data.x_struct.fields[slice_len_index];
    ConstExprValue *array_val = ptr_field->data.x_ptr.base_ptr;
    assert(ptr_field->data.x_ptr.index != SIZE_MAX);
    size_t len = len_field->data.x_bignum.data.x_uint;
    Buf *result = buf_alloc();
    buf_resize(result, len);
    for (size_t i = 0; i < len; i += 1) {
        size_t new_index = ptr_field->data.x_ptr.index + i;
        ConstExprValue *char_val = &array_val->data.x_array.elements[new_index];
        uint64_t big_c = char_val->data.x_bignum.data.x_uint;
        assert(big_c <= UINT8_MAX);
        uint8_t c = big_c;
        buf_ptr(result)[i] = c;
    }
    return result;
}

static TypeTableEntry *ir_analyze_instruction_return(IrAnalyze *ira,
    IrInstructionReturn *return_instruction)
{
    IrInstruction *value = return_instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ir_unreach_error(ira);
    ira->implicit_return_type_list.append(value);

    IrInstruction *casted_value = ir_implicit_cast(ira, value, ira->explicit_return_type);
    if (casted_value == ira->codegen->invalid_instruction)
        return ir_unreach_error(ira);

    ir_build_return_from(&ira->new_irb, &return_instruction->base, casted_value);
    return ir_finish_anal(ira, ira->codegen->builtin_types.entry_unreachable);
}

static TypeTableEntry *ir_analyze_instruction_const(IrAnalyze *ira, IrInstructionConst *const_instruction) {
    bool depends_on_compile_var = const_instruction->base.static_value.depends_on_compile_var;
    ConstExprValue *out_val = ir_build_const_from(ira, &const_instruction->base, depends_on_compile_var);
    *out_val = const_instruction->base.static_value;
    return const_instruction->base.type_entry;
}

static TypeTableEntry *ir_analyze_bin_op_bool(IrAnalyze *ira, IrInstructionBinOp *bin_op_instruction) {
    IrInstruction *op1 = bin_op_instruction->op1->other;
    if (op1->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *op2 = bin_op_instruction->op2->other;
    if (op2->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *bool_type = ira->codegen->builtin_types.entry_bool;

    IrInstruction *casted_op1 = ir_implicit_cast(ira, op1, bool_type);
    if (casted_op1 == ira->codegen->invalid_instruction)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_op2 = ir_implicit_cast(ira, op2, bool_type);
    if (casted_op2 == ira->codegen->invalid_instruction)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *op1_val = &casted_op1->static_value;
    ConstExprValue *op2_val = &casted_op2->static_value;
    if (op1_val->special != ConstValSpecialRuntime && op2_val->special != ConstValSpecialRuntime) {
        bool depends_on_compile_var = op1_val->depends_on_compile_var || op2_val->depends_on_compile_var;
        ConstExprValue *out_val = ir_build_const_from(ira, &bin_op_instruction->base, depends_on_compile_var);

        assert(casted_op1->type_entry->id == TypeTableEntryIdBool);
        assert(casted_op2->type_entry->id == TypeTableEntryIdBool);
        if (bin_op_instruction->op_id == IrBinOpBoolOr) {
            out_val->data.x_bool = op1_val->data.x_bool || op2_val->data.x_bool;
        } else if (bin_op_instruction->op_id == IrBinOpBoolAnd) {
            out_val->data.x_bool = op1_val->data.x_bool && op2_val->data.x_bool;
        } else {
            zig_unreachable();
        }
        return bool_type;
    }

    ir_build_bin_op_from(&ira->new_irb, &bin_op_instruction->base, bin_op_instruction->op_id,
            casted_op1, casted_op2, bin_op_instruction->safety_check_on);
    return bool_type;
}

static TypeTableEntry *ir_analyze_bin_op_cmp(IrAnalyze *ira, IrInstructionBinOp *bin_op_instruction) {
    IrInstruction *op1 = bin_op_instruction->op1->other;
    IrInstruction *op2 = bin_op_instruction->op2->other;
    IrInstruction *instructions[] = {op1, op2};
    TypeTableEntry *resolved_type = ir_resolve_peer_types(ira, bin_op_instruction->base.source_node, instructions, 2);
    if (resolved_type->id == TypeTableEntryIdInvalid)
        return resolved_type;
    IrBinOp op_id = bin_op_instruction->op_id;

    bool is_equality_cmp = (op_id == IrBinOpCmpEq || op_id == IrBinOpCmpNotEq);
    AstNode *source_node = bin_op_instruction->base.source_node;
    switch (resolved_type->id) {
        case TypeTableEntryIdInvalid:
            return ira->codegen->builtin_types.entry_invalid;

        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
            break;

        case TypeTableEntryIdBool:
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdTypeDecl:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdBoundFn:
            if (!is_equality_cmp) {
                add_node_error(ira->codegen, source_node,
                    buf_sprintf("operator not allowed for type '%s'", buf_ptr(&resolved_type->name)));
                return ira->codegen->builtin_types.entry_invalid;
            }
            break;

        case TypeTableEntryIdEnum:
            if (!is_equality_cmp || resolved_type->data.enumeration.gen_field_count != 0) {
                add_node_error(ira->codegen, source_node,
                    buf_sprintf("operator not allowed for type '%s'", buf_ptr(&resolved_type->name)));
                return ira->codegen->builtin_types.entry_invalid;
            }
            break;

        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdUnion:
            add_node_error(ira->codegen, source_node,
                buf_sprintf("operator not allowed for type '%s'", buf_ptr(&resolved_type->name)));
            return ira->codegen->builtin_types.entry_invalid;

        case TypeTableEntryIdVar:
            zig_unreachable();
    }

    IrInstruction *casted_op1 = ir_implicit_cast(ira, op1, resolved_type);
    if (casted_op1 == ira->codegen->invalid_instruction)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_op2 = ir_implicit_cast(ira, op2, resolved_type);
    if (casted_op2 == ira->codegen->invalid_instruction)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *op1_val = &casted_op1->static_value;
    ConstExprValue *op2_val = &casted_op2->static_value;
    if (op1_val->special != ConstValSpecialRuntime && op2_val->special != ConstValSpecialRuntime) {
        bool type_can_gt_lt_cmp = (resolved_type->id == TypeTableEntryIdNumLitFloat ||
                resolved_type->id == TypeTableEntryIdNumLitInt ||
                resolved_type->id == TypeTableEntryIdFloat ||
                resolved_type->id == TypeTableEntryIdInt);
        bool answer;
        if (type_can_gt_lt_cmp) {
            bool (*bignum_cmp)(BigNum *, BigNum *);
            if (op_id == IrBinOpCmpEq) {
                bignum_cmp = bignum_cmp_eq;
            } else if (op_id == IrBinOpCmpNotEq) {
                bignum_cmp = bignum_cmp_neq;
            } else if (op_id == IrBinOpCmpLessThan) {
                bignum_cmp = bignum_cmp_lt;
            } else if (op_id == IrBinOpCmpGreaterThan) {
                bignum_cmp = bignum_cmp_gt;
            } else if (op_id == IrBinOpCmpLessOrEq) {
                bignum_cmp = bignum_cmp_lte;
            } else if (op_id == IrBinOpCmpGreaterOrEq) {
                bignum_cmp = bignum_cmp_gte;
            } else {
                zig_unreachable();
            }

            answer = bignum_cmp(&op1_val->data.x_bignum, &op2_val->data.x_bignum);
        } else {
            bool are_equal = const_values_equal(op1_val, op2_val, resolved_type);
            if (op_id == IrBinOpCmpEq) {
                answer = are_equal;
            } else if (op_id == IrBinOpCmpNotEq) {
                answer = !are_equal;
            } else {
                zig_unreachable();
            }
        }

        bool depends_on_compile_var = op1_val->depends_on_compile_var || op2_val->depends_on_compile_var;
        ConstExprValue *out_val = ir_build_const_from(ira, &bin_op_instruction->base, depends_on_compile_var);
        out_val->data.x_bool = answer;
        return ira->codegen->builtin_types.entry_bool;
    }

    ir_build_bin_op_from(&ira->new_irb, &bin_op_instruction->base, op_id,
            casted_op1, casted_op2, bin_op_instruction->safety_check_on);

    return ira->codegen->builtin_types.entry_bool;
}

static uint64_t max_unsigned_val(TypeTableEntry *type_entry) {
    assert(type_entry->id == TypeTableEntryIdInt);
    if (type_entry->data.integral.bit_count == 64) {
        return UINT64_MAX;
    } else if (type_entry->data.integral.bit_count == 32) {
        return UINT32_MAX;
    } else if (type_entry->data.integral.bit_count == 16) {
        return UINT16_MAX;
    } else if (type_entry->data.integral.bit_count == 8) {
        return UINT8_MAX;
    } else {
        zig_unreachable();
    }
}

static int ir_eval_bignum(ConstExprValue *op1_val, ConstExprValue *op2_val,
        ConstExprValue *out_val, bool (*bignum_fn)(BigNum *, BigNum *, BigNum *),
        TypeTableEntry *type, bool wrapping_op)
{
    bool overflow = bignum_fn(&out_val->data.x_bignum, &op1_val->data.x_bignum, &op2_val->data.x_bignum);
    if (overflow) {
        return ErrorOverflow;
    }

    if (type->id == TypeTableEntryIdInt && !bignum_fits_in_bits(&out_val->data.x_bignum,
                type->data.integral.bit_count, type->data.integral.is_signed))
    {
        if (wrapping_op) {
            if (type->data.integral.is_signed) {
                out_val->data.x_bignum.data.x_uint = max_unsigned_val(type) - out_val->data.x_bignum.data.x_uint + 1;
                out_val->data.x_bignum.is_negative = !out_val->data.x_bignum.is_negative;
            } else if (out_val->data.x_bignum.is_negative) {
                out_val->data.x_bignum.data.x_uint = max_unsigned_val(type) - out_val->data.x_bignum.data.x_uint + 1;
                out_val->data.x_bignum.is_negative = false;
            } else {
                bignum_truncate(&out_val->data.x_bignum, type->data.integral.bit_count);
            }
        } else {
            return ErrorOverflow;
        }
    }

    out_val->special = ConstValSpecialStatic;
    out_val->depends_on_compile_var = op1_val->depends_on_compile_var || op2_val->depends_on_compile_var;
    return 0;
}

static int ir_eval_math_op(ConstExprValue *op1_val, TypeTableEntry *op1_type,
        IrBinOp op_id, ConstExprValue *op2_val, TypeTableEntry *op2_type, ConstExprValue *out_val)
{
    switch (op_id) {
        case IrBinOpInvalid:
        case IrBinOpBoolOr:
        case IrBinOpBoolAnd:
        case IrBinOpCmpEq:
        case IrBinOpCmpNotEq:
        case IrBinOpCmpLessThan:
        case IrBinOpCmpGreaterThan:
        case IrBinOpCmpLessOrEq:
        case IrBinOpCmpGreaterOrEq:
        case IrBinOpArrayCat:
        case IrBinOpArrayMult:
            zig_unreachable();
        case IrBinOpBinOr:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_or, op1_type, false);
        case IrBinOpBinXor:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_xor, op1_type, false);
        case IrBinOpBinAnd:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_and, op1_type, false);
        case IrBinOpBitShiftLeft:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_shl, op1_type, false);
        case IrBinOpBitShiftLeftWrap:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_shl, op1_type, true);
        case IrBinOpBitShiftRight:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_shr, op1_type, false);
        case IrBinOpAdd:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_add, op1_type, false);
        case IrBinOpAddWrap:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_add, op1_type, true);
        case IrBinOpSub:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_sub, op1_type, false);
        case IrBinOpSubWrap:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_sub, op1_type, true);
        case IrBinOpMult:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_mul, op1_type, false);
        case IrBinOpMultWrap:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_mul, op1_type, true);
        case IrBinOpDiv:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_div, op1_type, false);
        case IrBinOpMod:
            return ir_eval_bignum(op1_val, op2_val, out_val, bignum_mod, op1_type, false);
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_bin_op_math(IrAnalyze *ira, IrInstructionBinOp *bin_op_instruction) {
    IrInstruction *op1 = bin_op_instruction->op1->other;
    IrInstruction *op2 = bin_op_instruction->op2->other;
    IrInstruction *instructions[] = {op1, op2};
    TypeTableEntry *resolved_type = ir_resolve_peer_types(ira, bin_op_instruction->base.source_node, instructions, 2);
    if (resolved_type->id == TypeTableEntryIdInvalid)
        return resolved_type;
    IrBinOp op_id = bin_op_instruction->op_id;

    if (resolved_type->id == TypeTableEntryIdInt ||
        resolved_type->id == TypeTableEntryIdNumLitInt)
    {
        // int
    } else if ((resolved_type->id == TypeTableEntryIdFloat ||
                resolved_type->id == TypeTableEntryIdNumLitFloat) &&
        (op_id == IrBinOpAdd ||
            op_id == IrBinOpSub ||
            op_id == IrBinOpMult ||
            op_id == IrBinOpDiv ||
            op_id == IrBinOpMod))
    {
        // float
    } else {
        AstNode *source_node = bin_op_instruction->base.source_node;
        add_node_error(ira->codegen, source_node,
            buf_sprintf("invalid operands to binary expression: '%s' and '%s'",
                buf_ptr(&op1->type_entry->name),
                buf_ptr(&op2->type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    IrInstruction *casted_op1 = ir_implicit_cast(ira, op1, resolved_type);
    if (casted_op1 == ira->codegen->invalid_instruction)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_op2 = ir_implicit_cast(ira, op2, resolved_type);
    if (casted_op2 == ira->codegen->invalid_instruction)
        return ira->codegen->builtin_types.entry_invalid;


    if (casted_op1->static_value.special != ConstValSpecialRuntime && casted_op2->static_value.special != ConstValSpecialRuntime) {
        ConstExprValue *op1_val = &casted_op1->static_value;
        ConstExprValue *op2_val = &casted_op2->static_value;
        ConstExprValue *out_val = &bin_op_instruction->base.static_value;

        bin_op_instruction->base.other = &bin_op_instruction->base;

        int err;
        if ((err = ir_eval_math_op(op1_val, resolved_type, op_id, op2_val, resolved_type, out_val))) {
            if (err == ErrorDivByZero) {
                add_node_error(ira->codegen, bin_op_instruction->base.source_node,
                        buf_sprintf("division by zero is undefined"));
                return ira->codegen->builtin_types.entry_invalid;
            } else if (err == ErrorOverflow) {
                add_node_error(ira->codegen, bin_op_instruction->base.source_node,
                        buf_sprintf("value cannot be represented in any integer type"));
                return ira->codegen->builtin_types.entry_invalid;
            }
            return ira->codegen->builtin_types.entry_invalid;
        }

        ir_num_lit_fits_in_other_type(ira, &bin_op_instruction->base, resolved_type);
        return resolved_type;

    }

    ir_build_bin_op_from(&ira->new_irb, &bin_op_instruction->base, op_id,
            casted_op1, casted_op2, bin_op_instruction->safety_check_on);
    return resolved_type;
}

static TypeTableEntry *ir_analyze_array_cat(IrAnalyze *ira, IrInstructionBinOp *instruction) {
    IrInstruction *op1 = instruction->op1->other;
    TypeTableEntry *op1_canon_type = get_underlying_type(op1->type_entry);
    if (op1_canon_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *op2 = instruction->op2->other;
    TypeTableEntry *op2_canon_type = get_underlying_type(op2->type_entry);
    if (op2_canon_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *op1_val = ir_resolve_const(ira, op1);
    if (!op1_val)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *op2_val = ir_resolve_const(ira, op2);
    if (!op2_val)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *op1_array_val;
    size_t op1_array_index;
    size_t op1_array_end;
    TypeTableEntry *child_type;
    if (op1_canon_type->id == TypeTableEntryIdArray) {
        child_type = op1_canon_type->data.array.child_type;
        op1_array_val = op1_val;
        op1_array_index = 0;
        op1_array_end = op1_val->data.x_array.size;
    } else if (op1_canon_type->id == TypeTableEntryIdPointer &&
        op1_canon_type->data.pointer.child_type == ira->codegen->builtin_types.entry_u8 &&
        op1_val->data.x_ptr.special == ConstPtrSpecialCStr)
    {
        child_type = op1_canon_type->data.pointer.child_type;
        op1_array_val = op1_val->data.x_ptr.base_ptr;
        op1_array_index = op1_val->data.x_ptr.index;
        op1_array_end = op1_array_val->data.x_array.size - 1;
    } else {
        ir_add_error(ira, op1,
            buf_sprintf("expected array or C string literal, found '%s'", buf_ptr(&op1->type_entry->name)));
        // TODO if meta_type is type decl, add note pointing to type decl declaration
        return ira->codegen->builtin_types.entry_invalid;
    }

    ConstExprValue *op2_array_val;
    size_t op2_array_index;
    size_t op2_array_end;
    if (op2_canon_type->id == TypeTableEntryIdArray) {
        if (op2_canon_type->data.array.child_type != child_type) {
            ir_add_error(ira, op2, buf_sprintf("expected array of type '%s', found '%s'",
                        buf_ptr(&child_type->name),
                        buf_ptr(&op2->type_entry->name)));
            return ira->codegen->builtin_types.entry_invalid;
        }
        op2_array_val = op2_val;
        op2_array_index = 0;
        op2_array_end = op2_array_val->data.x_array.size;
    } else if (op2_canon_type->id == TypeTableEntryIdPointer &&
        op2_canon_type->data.pointer.child_type == ira->codegen->builtin_types.entry_u8 &&
        op2_val->data.x_ptr.special == ConstPtrSpecialCStr)
    {
        if (child_type != ira->codegen->builtin_types.entry_u8) {
            ir_add_error(ira, op2, buf_sprintf("expected array of type '%s', found '%s'",
                        buf_ptr(&child_type->name),
                        buf_ptr(&op2->type_entry->name)));
            return ira->codegen->builtin_types.entry_invalid;
        }
        op2_array_val = op2_val->data.x_ptr.base_ptr;
        op2_array_index = op2_val->data.x_ptr.index;
        op2_array_end = op2_array_val->data.x_array.size - 1;
    } else {
        ir_add_error(ira, op2,
            buf_sprintf("expected array or C string literal, found '%s'", buf_ptr(&op1->type_entry->name)));
        // TODO if meta_type is type decl, add note pointing to type decl declaration
        return ira->codegen->builtin_types.entry_invalid;
    }

    bool depends_on_compile_var = op1->static_value.depends_on_compile_var || op2->static_value.depends_on_compile_var;
    ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);

    TypeTableEntry *result_type;
    ConstExprValue *out_array_val;
    size_t new_len = (op1_array_end - op1_array_index) + (op2_array_end - op2_array_index);
    if (op1_canon_type->id == TypeTableEntryIdArray || op2_canon_type->id == TypeTableEntryIdArray) {
        result_type = get_array_type(ira->codegen, child_type, new_len);

        out_array_val = out_val;
    } else {
        result_type = get_pointer_to_type(ira->codegen, child_type, true);

        out_array_val = allocate<ConstExprValue>(1);
        out_array_val->special = ConstValSpecialStatic;
        out_val->data.x_ptr.base_ptr = out_array_val;
        out_val->data.x_ptr.index = 0;
        out_val->data.x_ptr.special = ConstPtrSpecialCStr;

        new_len += 1; // null byte
    }
    out_array_val->data.x_array.elements = allocate<ConstExprValue>(new_len);
    out_array_val->data.x_array.size = new_len;

    size_t next_index = 0;
    for (size_t i = op1_array_index; i < op1_array_end; i += 1, next_index += 1) {
        out_array_val->data.x_array.elements[next_index] = op1_array_val->data.x_array.elements[i];
    }
    for (size_t i = op2_array_index; i < op2_array_end; i += 1, next_index += 1) {
        out_array_val->data.x_array.elements[next_index] = op2_array_val->data.x_array.elements[i];
    }
    if (next_index < new_len) {
        ConstExprValue *null_byte = &out_array_val->data.x_array.elements[next_index];
        null_byte->special = ConstValSpecialStatic;
        bignum_init_unsigned(&null_byte->data.x_bignum, 0);
        next_index += 1;
    }
    assert(next_index == new_len);

    return result_type;
}

static TypeTableEntry *ir_analyze_array_mult(IrAnalyze *ira, IrInstructionBinOp *instruction) {
    IrInstruction *op1 = instruction->op1->other;
    if (op1->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *op2 = instruction->op2->other;
    if (op2->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *array_val = ir_resolve_const(ira, op1);
    if (!array_val)
        return ira->codegen->builtin_types.entry_invalid;

    uint64_t mult_amt;
    if (!ir_resolve_usize(ira, op2, &mult_amt))
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *array_canon_type = get_underlying_type(op1->type_entry);
    if (array_canon_type->id != TypeTableEntryIdArray) {
        ir_add_error(ira, op1, buf_sprintf("expected array type, found '%s'", buf_ptr(&op1->type_entry->name)));
        // TODO if meta_type is type decl, add note pointing to type decl declaration
        return ira->codegen->builtin_types.entry_invalid;
    }

    uint64_t old_array_len = array_canon_type->data.array.len;

    BigNum array_len;
    bignum_init_unsigned(&array_len, old_array_len);
    if (bignum_multiply_by_scalar(&array_len, mult_amt)) {
        ir_add_error(ira, &instruction->base, buf_sprintf("operation results in overflow"));
        return ira->codegen->builtin_types.entry_invalid;
    }

    bool depends_on_compile_var = op1->static_value.depends_on_compile_var || op2->static_value.depends_on_compile_var;
    ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);

    uint64_t new_array_len = array_len.data.x_uint;
    out_val->data.x_array.size = new_array_len;
    out_val->data.x_array.elements = allocate<ConstExprValue>(new_array_len);

    uint64_t i = 0;
    for (uint64_t x = 0; x < mult_amt; x += 1) {
        for (uint64_t y = 0; y < old_array_len; y += 1) {
            out_val->data.x_array.elements[i] = array_val->data.x_array.elements[y];
            i += 1;
        }
    }
    assert(i == new_array_len);

    TypeTableEntry *child_type = array_canon_type->data.array.child_type;
    return get_array_type(ira->codegen, child_type, new_array_len);
}

static TypeTableEntry *ir_analyze_instruction_bin_op(IrAnalyze *ira, IrInstructionBinOp *bin_op_instruction) {
    IrBinOp op_id = bin_op_instruction->op_id;
    switch (op_id) {
        case IrBinOpInvalid:
            zig_unreachable();
        case IrBinOpBoolOr:
        case IrBinOpBoolAnd:
            return ir_analyze_bin_op_bool(ira, bin_op_instruction);
        case IrBinOpCmpEq:
        case IrBinOpCmpNotEq:
        case IrBinOpCmpLessThan:
        case IrBinOpCmpGreaterThan:
        case IrBinOpCmpLessOrEq:
        case IrBinOpCmpGreaterOrEq:
            return ir_analyze_bin_op_cmp(ira, bin_op_instruction);
        case IrBinOpBinOr:
        case IrBinOpBinXor:
        case IrBinOpBinAnd:
        case IrBinOpBitShiftLeft:
        case IrBinOpBitShiftLeftWrap:
        case IrBinOpBitShiftRight:
        case IrBinOpAdd:
        case IrBinOpAddWrap:
        case IrBinOpSub:
        case IrBinOpSubWrap:
        case IrBinOpMult:
        case IrBinOpMultWrap:
        case IrBinOpDiv:
        case IrBinOpMod:
            return ir_analyze_bin_op_math(ira, bin_op_instruction);
        case IrBinOpArrayCat:
            return ir_analyze_array_cat(ira, bin_op_instruction);
        case IrBinOpArrayMult:
            return ir_analyze_array_mult(ira, bin_op_instruction);
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_decl_var(IrAnalyze *ira, IrInstructionDeclVar *decl_var_instruction) {
    VariableTableEntry *var = decl_var_instruction->var;

    IrInstruction *init_value = decl_var_instruction->init_value->other;
    if (init_value->type_entry->id == TypeTableEntryIdInvalid) {
        var->type = ira->codegen->builtin_types.entry_invalid;
        return var->type;
    }

    AstNodeVariableDeclaration *variable_declaration = &var->decl_node->data.variable_declaration;
    bool is_export = (variable_declaration->visib_mod == VisibModExport);
    bool is_extern = variable_declaration->is_extern;

    var->ref_count = 0;

    TypeTableEntry *explicit_type = nullptr;
    IrInstruction *var_type = nullptr;
    if (decl_var_instruction->var_type != nullptr) {
        var_type = decl_var_instruction->var_type->other;
        TypeTableEntry *proposed_type = ir_resolve_type(ira, var_type);
        explicit_type = validate_var_type(ira->codegen, var_type->source_node, proposed_type);
        if (explicit_type->id == TypeTableEntryIdInvalid)
            return explicit_type;
    }

    AstNode *source_node = decl_var_instruction->base.source_node;

    IrInstruction *casted_init_value = ir_implicit_cast(ira, init_value, explicit_type);
    TypeTableEntry *result_type = get_underlying_type(casted_init_value->type_entry);
    switch (result_type->id) {
        case TypeTableEntryIdTypeDecl:
            zig_unreachable();
        case TypeTableEntryIdInvalid:
            result_type = ira->codegen->builtin_types.entry_invalid;
            break;
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
            if (is_export || is_extern || casted_init_value->static_value.special == ConstValSpecialRuntime) {
                add_node_error(ira->codegen, source_node, buf_sprintf("unable to infer variable type"));
                result_type = ira->codegen->builtin_types.entry_invalid;
            }
            break;
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdVar:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdNullLit:
            add_node_error(ira->codegen, source_node,
                buf_sprintf("variable of type '%s' not allowed", buf_ptr(&result_type->name)));
            result_type = ira->codegen->builtin_types.entry_invalid;
            break;
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdNamespace:
            if (casted_init_value->static_value.special == ConstValSpecialRuntime) {
                add_node_error(ira->codegen, source_node,
                    buf_sprintf("variable of type '%s' must be constant", buf_ptr(&result_type->name)));
                result_type = ira->codegen->builtin_types.entry_invalid;
            }
            break;
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdBoundFn:
            // OK
            break;
    }

    var->type = result_type;
    assert(var->type);

    if (casted_init_value->static_value.special == ConstValSpecialStatic) {
        if (var->mem_slot_index != SIZE_MAX) {
            assert(var->mem_slot_index < ira->exec_context.mem_slot_count);
            ConstExprValue *mem_slot = &ira->exec_context.mem_slot_list[var->mem_slot_index];
            *mem_slot = casted_init_value->static_value;
        }
    } else if (var->is_inline) {
        ir_add_error(ira, &decl_var_instruction->base,
                buf_sprintf("cannot store runtime value in compile time variable"));
        var->type = ira->codegen->builtin_types.entry_invalid;
        return ira->codegen->builtin_types.entry_invalid;
    }

    ir_build_var_decl_from(&ira->new_irb, &decl_var_instruction->base, var, var_type, casted_init_value);

    FnTableEntry *fn_entry = exec_fn_entry(ira->new_irb.exec);
    if (fn_entry)
        fn_entry->variable_list.append(var);

    return ira->codegen->builtin_types.entry_void;
}

static bool ir_analyze_fn_call_inline_arg(IrAnalyze *ira, AstNode *fn_proto_node,
    IrInstruction *arg, Scope **exec_scope, size_t *next_proto_i)
{
    AstNode *param_decl_node = fn_proto_node->data.fn_proto.params.at(*next_proto_i);
    assert(param_decl_node->type == NodeTypeParamDecl);
    AstNode *param_type_node = param_decl_node->data.param_decl.type;
    TypeTableEntry *param_type = analyze_type_expr(ira->codegen, *exec_scope, param_type_node);
    if (param_type->id == TypeTableEntryIdInvalid)
        return false;

    IrInstruction *casted_arg = ir_implicit_cast(ira, arg, param_type);
    if (casted_arg->type_entry->id == TypeTableEntryIdInvalid)
        return false;

    ConstExprValue *first_arg_val = ir_resolve_const(ira, casted_arg);
    if (!first_arg_val)
        return false;

    Buf *param_name = param_decl_node->data.param_decl.name;
    VariableTableEntry *var = add_variable(ira->codegen, param_decl_node,
        *exec_scope, param_name, param_type, true, first_arg_val);
    *exec_scope = var->child_scope;
    *next_proto_i += 1;

    return true;
}

static bool ir_analyze_fn_call_generic_arg(IrAnalyze *ira, AstNode *fn_proto_node,
    IrInstruction *arg, Scope **child_scope, size_t *next_proto_i,
    GenericFnTypeId *generic_id, FnTypeId *fn_type_id, IrInstruction **casted_args,
    FnTableEntry *impl_fn)
{
    AstNode *param_decl_node = fn_proto_node->data.fn_proto.params.at(*next_proto_i);
    assert(param_decl_node->type == NodeTypeParamDecl);
    AstNode *param_type_node = param_decl_node->data.param_decl.type;
    TypeTableEntry *param_type = analyze_type_expr(ira->codegen, *child_scope, param_type_node);
    if (param_type->id == TypeTableEntryIdInvalid)
        return false;

    bool is_var_type = (param_type->id == TypeTableEntryIdVar);
    IrInstruction *casted_arg;
    if (is_var_type) {
        casted_arg = arg;
    } else {
        casted_arg = ir_implicit_cast(ira, arg, param_type);
        if (casted_arg->type_entry->id == TypeTableEntryIdInvalid)
            return false;
    }

    bool inline_arg = param_decl_node->data.param_decl.is_inline;
    if (inline_arg || is_var_type) {
        ConstExprValue *arg_val = ir_resolve_const(ira, casted_arg);
        if (!arg_val)
            return false;

        Buf *param_name = param_decl_node->data.param_decl.name;
        VariableTableEntry *var = add_variable(ira->codegen, param_decl_node,
            *child_scope, param_name, param_type, true, arg_val);
        *child_scope = var->child_scope;
        // This generic function instance could be called with anything, so when this variable is read it
        // needs to know that it depends on compile time variable data.
        var->value->depends_on_compile_var = true;

        GenericParamValue *generic_param = &generic_id->params[generic_id->param_count];
        generic_param->type = casted_arg->type_entry;
        generic_param->value = arg_val;
        generic_id->param_count += 1;
    } else {
        casted_args[fn_type_id->param_count] = casted_arg;
        FnTypeParamInfo *param_info = &fn_type_id->param_info[fn_type_id->param_count];
        param_info->type = param_type;
        param_info->is_noalias = param_decl_node->data.param_decl.is_noalias;
        impl_fn->param_source_nodes[fn_type_id->param_count] = param_decl_node;
        fn_type_id->param_count += 1;
    }
    *next_proto_i += 1;
    return true;
}

static TypeTableEntry *ir_analyze_fn_call(IrAnalyze *ira, IrInstructionCall *call_instruction,
    FnTableEntry *fn_entry, TypeTableEntry *fn_type, IrInstruction *fn_ref,
    IrInstruction *first_arg_ptr, bool inline_fn_call)
{
    FnTypeId *fn_type_id = &fn_type->data.fn.fn_type_id;
    size_t first_arg_1_or_0 = first_arg_ptr ? 1 : 0;
    size_t src_param_count = fn_type_id->param_count;
    size_t call_param_count = call_instruction->arg_count + first_arg_1_or_0;
    AstNode *source_node = call_instruction->base.source_node;

    AstNode *fn_proto_node = fn_entry ? fn_entry->proto_node : nullptr;;

    if (fn_type_id->is_var_args) {
        if (call_param_count < src_param_count) {
            ErrorMsg *msg = add_node_error(ira->codegen, source_node,
                buf_sprintf("expected at least %zu arguments, found %zu", src_param_count, call_param_count));
            if (fn_proto_node) {
                add_error_note(ira->codegen, msg, fn_proto_node,
                    buf_sprintf("declared here"));
            }
            return ira->codegen->builtin_types.entry_invalid;
        }
    } else if (src_param_count != call_param_count) {
        ErrorMsg *msg = add_node_error(ira->codegen, source_node,
            buf_sprintf("expected %zu arguments, found %zu", src_param_count, call_param_count));
        if (fn_proto_node) {
            add_error_note(ira->codegen, msg, fn_proto_node,
                buf_sprintf("declared here"));
        }
        return ira->codegen->builtin_types.entry_invalid;
    }

    if (inline_fn_call) {
        // No special handling is needed for compile time evaluation of generic functions.
        if (!fn_entry) {
            ir_add_error(ira, fn_ref, buf_sprintf("unable to evaluate constant expression"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        if (!ir_emit_backward_branch(ira, &call_instruction->base))
            return ira->codegen->builtin_types.entry_invalid;

        // Fork a scope of the function with known values for the parameters.
        Scope *exec_scope = &fn_entry->fndef_scope->base;

        size_t next_proto_i = 0;
        if (first_arg_ptr) {
            IrInstruction *first_arg = ir_get_deref(ira, first_arg_ptr, first_arg_ptr);
            if (first_arg->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            if (!ir_analyze_fn_call_inline_arg(ira, fn_proto_node, first_arg, &exec_scope, &next_proto_i))
                return ira->codegen->builtin_types.entry_invalid;
        }

        for (size_t call_i = 0; call_i < call_instruction->arg_count; call_i += 1) {
            IrInstruction *old_arg = call_instruction->args[call_i]->other;
            if (old_arg->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            if (!ir_analyze_fn_call_inline_arg(ira, fn_proto_node, old_arg, &exec_scope, &next_proto_i))
                return ira->codegen->builtin_types.entry_invalid;
        }

        AstNode *return_type_node = fn_proto_node->data.fn_proto.return_type;
        TypeTableEntry *return_type = analyze_type_expr(ira->codegen, exec_scope, return_type_node);
        if (return_type->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;

        // Analyze the fn body block like any other constant expression.
        AstNode *body_node = fn_entry->fn_def_node->data.fn_def.body;
        IrInstruction *result = ir_eval_const_value(ira->codegen, exec_scope, body_node, return_type,
            ira->new_irb.exec->backward_branch_count, ira->new_irb.exec->backward_branch_quota, fn_entry, nullptr);
        if (result->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;

        ConstExprValue *out_val = ir_build_const_from(ira, &call_instruction->base,
                result->static_value.depends_on_compile_var);
        *out_val = result->static_value;
        return ir_finish_anal(ira, return_type);
    }

    if (fn_type->data.fn.is_generic) {
        assert(fn_entry);

        IrInstruction **casted_args = allocate<IrInstruction *>(call_param_count);

        // Fork a scope of the function with known values for the parameters.
        Scope *parent_scope = fn_entry->fndef_scope->base.parent;
        FnTableEntry *impl_fn = create_fn(fn_proto_node);
        impl_fn->param_source_nodes = allocate<AstNode *>(call_param_count);
        buf_init_from_buf(&impl_fn->symbol_name, &fn_entry->symbol_name);
        impl_fn->fndef_scope = create_fndef_scope(impl_fn->fn_def_node, parent_scope, impl_fn);
        impl_fn->child_scope = &impl_fn->fndef_scope->base;
        FnTypeId fn_type_id = {0};
        init_fn_type_id(&fn_type_id, fn_proto_node);
        fn_type_id.param_count = 0;

        // TODO maybe GenericFnTypeId can be replaced with using the child_scope directly
        // as the key in generic_table
        GenericFnTypeId *generic_id = allocate<GenericFnTypeId>(1);
        generic_id->fn_entry = fn_entry;
        generic_id->param_count = 0;
        generic_id->params = allocate<GenericParamValue>(src_param_count);
        size_t next_proto_i = 0;

        if (first_arg_ptr) {
            IrInstruction *first_arg = ir_get_deref(ira, first_arg_ptr, first_arg_ptr);
            if (first_arg->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            if (!ir_analyze_fn_call_generic_arg(ira, fn_proto_node, first_arg, &impl_fn->child_scope,
                &next_proto_i, generic_id, &fn_type_id, casted_args, impl_fn))
            {
                return ira->codegen->builtin_types.entry_invalid;
            }
        }
        for (size_t call_i = 0; call_i < call_instruction->arg_count; call_i += 1) {
            IrInstruction *arg = call_instruction->args[call_i]->other;
            if (arg->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            if (!ir_analyze_fn_call_generic_arg(ira, fn_proto_node, arg, &impl_fn->child_scope,
                &next_proto_i, generic_id, &fn_type_id, casted_args, impl_fn))
            {
                return ira->codegen->builtin_types.entry_invalid;
            }
        }

        auto existing_entry = ira->codegen->generic_table.put_unique(generic_id, impl_fn);
        if (existing_entry) {
            // throw away all our work and use the existing function
            impl_fn = existing_entry->value;
        } else {
            // finish instantiating the function
            AstNode *return_type_node = fn_proto_node->data.fn_proto.return_type;
            TypeTableEntry *return_type = analyze_type_expr(ira->codegen, impl_fn->child_scope, return_type_node);
            if (return_type->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;
            fn_type_id.return_type = return_type;

            impl_fn->type_entry = get_fn_type(ira->codegen, &fn_type_id);
            if (impl_fn->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            ira->codegen->fn_protos.append(impl_fn);
            ira->codegen->fn_defs.append(impl_fn);
        }

        size_t impl_param_count = impl_fn->type_entry->data.fn.fn_type_id.param_count;
        IrInstruction *new_call_instruction = ir_build_call_from(&ira->new_irb, &call_instruction->base,
                impl_fn, nullptr, impl_param_count, casted_args);

        TypeTableEntry *return_type = impl_fn->type_entry->data.fn.fn_type_id.return_type;
        ir_add_alloca(ira, new_call_instruction, return_type);

        return ir_finish_anal(ira, return_type);
    }

    IrInstruction **casted_args = allocate<IrInstruction *>(call_param_count);
    size_t next_arg_index = 0;
    if (first_arg_ptr) {
        IrInstruction *first_arg = ir_get_deref(ira, first_arg_ptr, first_arg_ptr);
        if (first_arg->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;

        TypeTableEntry *param_type = fn_type_id->param_info[next_arg_index].type;
        if (param_type->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;

        IrInstruction *casted_arg = ir_implicit_cast(ira, first_arg, param_type);
        if (casted_arg->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;

        casted_args[next_arg_index] = casted_arg;
        next_arg_index += 1;
    }
    for (size_t call_i = 0; call_i < call_instruction->arg_count; call_i += 1) {
        IrInstruction *old_arg = call_instruction->args[call_i]->other;
        if (old_arg->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;
        IrInstruction *casted_arg;
        if (next_arg_index < src_param_count) {
            TypeTableEntry *param_type = fn_type_id->param_info[next_arg_index].type;
            if (param_type->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;
            casted_arg = ir_implicit_cast(ira, old_arg, param_type);
            if (casted_arg->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;
        } else {
            casted_arg = old_arg;
        }

        casted_args[next_arg_index] = casted_arg;
        next_arg_index += 1;
    }

    assert(next_arg_index == call_param_count);

    TypeTableEntry *return_type = fn_type_id->return_type;
    if (return_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *new_call_instruction = ir_build_call_from(&ira->new_irb, &call_instruction->base,
            fn_entry, fn_ref, call_param_count, casted_args);

    ir_add_alloca(ira, new_call_instruction, return_type);
    return ir_finish_anal(ira, return_type);
}

static TypeTableEntry *ir_analyze_instruction_call(IrAnalyze *ira, IrInstructionCall *call_instruction) {
    IrInstruction *fn_ref = call_instruction->fn_ref->other;
    if (fn_ref->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    bool is_inline = call_instruction->is_inline || ir_should_inline(&ira->new_irb);

    if (is_inline || fn_ref->static_value.special != ConstValSpecialRuntime) {
        if (fn_ref->type_entry->id == TypeTableEntryIdMetaType) {
            TypeTableEntry *dest_type = ir_resolve_type(ira, fn_ref);
            if (dest_type->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            size_t actual_param_count = call_instruction->arg_count;

            if (actual_param_count != 1) {
                add_node_error(ira->codegen, call_instruction->base.source_node,
                        buf_sprintf("cast expression expects exactly one parameter"));
                return ira->codegen->builtin_types.entry_invalid;
            }

            IrInstruction *arg = call_instruction->args[0]->other;

            IrInstruction *cast_instruction = ir_analyze_cast(ira, &call_instruction->base, dest_type, arg);
            if (cast_instruction->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            ir_link_new_instruction(cast_instruction, &call_instruction->base);
            return ir_finish_anal(ira, cast_instruction->type_entry);
        } else if (fn_ref->type_entry->id == TypeTableEntryIdFn) {
            FnTableEntry *fn_table_entry = ir_resolve_fn(ira, fn_ref);
            return ir_analyze_fn_call(ira, call_instruction, fn_table_entry, fn_table_entry->type_entry,
                fn_ref, nullptr, is_inline);
        } else if (fn_ref->type_entry->id == TypeTableEntryIdBoundFn) {
            assert(fn_ref->static_value.special == ConstValSpecialStatic);
            FnTableEntry *fn_table_entry = fn_ref->static_value.data.x_bound_fn.fn;
            IrInstruction *first_arg_ptr = fn_ref->static_value.data.x_bound_fn.first_arg;
            return ir_analyze_fn_call(ira, call_instruction, fn_table_entry, fn_table_entry->type_entry,
                nullptr, first_arg_ptr, is_inline);
        } else {
            add_node_error(ira->codegen, fn_ref->source_node,
                buf_sprintf("type '%s' not a function", buf_ptr(&fn_ref->type_entry->name)));
            return ira->codegen->builtin_types.entry_invalid;
        }
    }

    if (fn_ref->type_entry->id == TypeTableEntryIdFn) {
        return ir_analyze_fn_call(ira, call_instruction, nullptr, fn_ref->type_entry,
            fn_ref, nullptr, false);
    } else {
        add_node_error(ira->codegen, fn_ref->source_node,
            buf_sprintf("type '%s' not a function", buf_ptr(&fn_ref->type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }
}

static TypeTableEntry *ir_analyze_unary_prefix_op_err(IrAnalyze *ira, IrInstructionUnOp *un_op_instruction) {
    assert(un_op_instruction->op_id == IrUnOpError);
    IrInstruction *value = un_op_instruction->value->other;

    TypeTableEntry *type_entry = value->type_entry;
    if (type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *meta_type = ir_resolve_type(ira, value);
    TypeTableEntry *underlying_meta_type = get_underlying_type(meta_type);
    switch (underlying_meta_type->id) {
        case TypeTableEntryIdTypeDecl:
            zig_unreachable();
        case TypeTableEntryIdInvalid:
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdBoundFn:
            {
                ConstExprValue *out_val = ir_build_const_from(ira, &un_op_instruction->base,
                        value->static_value.depends_on_compile_var);
                TypeTableEntry *result_type = get_error_type(ira->codegen, meta_type);
                out_val->data.x_type = result_type;
                return ira->codegen->builtin_types.entry_type;
            }
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdVar:
            add_node_error(ira->codegen, un_op_instruction->base.source_node,
                    buf_sprintf("unable to wrap type '%s' in error type", buf_ptr(&meta_type->name)));
            // TODO if meta_type is type decl, add note pointing to type decl declaration
            return ira->codegen->builtin_types.entry_invalid;
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_unary_address_of(IrAnalyze *ira, IrInstructionUnOp *un_op_instruction,
        bool is_const)
{
    IrInstruction *value = un_op_instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *target_type = value->type_entry;
    TypeTableEntry *canon_target_type = get_underlying_type(target_type);
    switch (canon_target_type->id) {
        case TypeTableEntryIdTypeDecl:
            // impossible because we look at the canonicalized type
            zig_unreachable();
        case TypeTableEntryIdInvalid:
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdVar:
        case TypeTableEntryIdBoundFn:
            add_node_error(ira->codegen, un_op_instruction->base.source_node,
                    buf_sprintf("unable to get address of type '%s'", buf_ptr(&target_type->name)));
            // TODO if type decl, add note pointing to type decl declaration
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdMetaType:
            {
                ConstExprValue *out_val = ir_build_const_from(ira, &un_op_instruction->base,
                        value->static_value.depends_on_compile_var);
                assert(value->static_value.special != ConstValSpecialRuntime);
                TypeTableEntry *child_type = value->static_value.data.x_type;
                out_val->data.x_type = get_pointer_to_type(ira->codegen, child_type, is_const);
                return ira->codegen->builtin_types.entry_type;
            }
        case TypeTableEntryIdPointer:
            {
                // this instruction is a noop - we solved this in IR gen by passing
                // LValPurposeAddressOf which caused the loadptr to not do the load.
                ir_link_new_instruction(value, &un_op_instruction->base);
                return ir_finish_anal(ira, target_type);
            }
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
            zig_unreachable();
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_dereference(IrAnalyze *ira, IrInstructionUnOp *un_op_instruction) {
    IrInstruction *value = un_op_instruction->value->other;

    TypeTableEntry *ptr_type = value->type_entry;
    TypeTableEntry *child_type;
    if (ptr_type->id == TypeTableEntryIdInvalid) {
        return ira->codegen->builtin_types.entry_invalid;
    } else if (ptr_type->id == TypeTableEntryIdPointer) {
        child_type = ptr_type->data.pointer.child_type;
    } else {
        add_node_error(ira->codegen, un_op_instruction->base.source_node,
            buf_sprintf("attempt to dereference non-pointer type '%s'",
                buf_ptr(&ptr_type->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    // this dereference is always an rvalue because in the IR gen we identify lvalue and emit
    // one of the ptr instructions

    if (value->static_value.special != ConstValSpecialRuntime) {
        ConstExprValue *out_val = ir_build_const_from(ira, &un_op_instruction->base, false);
        ConstExprValue *pointee = const_ptr_pointee(&value->static_value);
        *out_val = *pointee;
        return child_type;
    }

    ir_build_un_op_from(&ira->new_irb, &un_op_instruction->base, IrUnOpDereference, value);
    return child_type;
}

static TypeTableEntry *ir_analyze_maybe(IrAnalyze *ira, IrInstructionUnOp *un_op_instruction) {
    IrInstruction *value = un_op_instruction->value->other;
    TypeTableEntry *type_entry = ir_resolve_type(ira, value);
    TypeTableEntry *canon_type = get_underlying_type(type_entry);
    switch (canon_type->id) {
        case TypeTableEntryIdInvalid:
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdVar:
        case TypeTableEntryIdTypeDecl:
            zig_unreachable();
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdBoundFn:
            {
                ConstExprValue *out_val = ir_build_const_from(ira, &un_op_instruction->base,
                        value->static_value.depends_on_compile_var);
                out_val->data.x_type = get_maybe_type(ira->codegen, type_entry);
                return ira->codegen->builtin_types.entry_type;
            }
        case TypeTableEntryIdUnreachable:
            add_node_error(ira->codegen, un_op_instruction->base.source_node,
                    buf_sprintf("type '%s' not nullable", buf_ptr(&type_entry->name)));
            // TODO if it's a type decl, put an error note here pointing to the decl
            return ira->codegen->builtin_types.entry_invalid;
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_unwrap_maybe(IrAnalyze *ira, IrInstructionUnOp *un_op_instruction) {
    IrInstruction *value = un_op_instruction->value->other;
    TypeTableEntry *type_entry = value->type_entry;
    if (type_entry->id == TypeTableEntryIdInvalid) {
        return type_entry;
    } else if (type_entry->id == TypeTableEntryIdMaybe) {
        if (value->static_value.special != ConstValSpecialRuntime) {
            bool depends_on_compile_var = value->static_value.depends_on_compile_var;
            ConstExprValue *out_val = ir_build_const_from(ira, &un_op_instruction->base, depends_on_compile_var);
            ConstExprValue *child_val = value->static_value.data.x_maybe;
            if (!child_val) {
                ir_add_error(ira, &un_op_instruction->base,
                        buf_sprintf("unable to unwrap null"));
                return ira->codegen->builtin_types.entry_invalid;
            }
            *out_val = *child_val;
            return type_entry->data.maybe.child_type;
        }
        ir_build_un_op_from(&ira->new_irb, &un_op_instruction->base, IrUnOpUnwrapMaybe, value);
        return type_entry->data.maybe.child_type;
    } else {
        add_node_error(ira->codegen, un_op_instruction->base.source_node,
            buf_sprintf("expected maybe type, found '%s'", buf_ptr(&type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }
}

static TypeTableEntry *ir_analyze_negation(IrAnalyze *ira, IrInstructionUnOp *un_op_instruction) {
    IrInstruction *value = un_op_instruction->value->other;
    TypeTableEntry *expr_type = value->type_entry;
    if (expr_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    bool is_wrap_op = (un_op_instruction->op_id == IrUnOpNegationWrap);

    if ((expr_type->id == TypeTableEntryIdInt && expr_type->data.integral.is_signed) ||
        expr_type->id == TypeTableEntryIdNumLitInt ||
        ((expr_type->id == TypeTableEntryIdFloat || expr_type->id == TypeTableEntryIdNumLitFloat) &&
        !is_wrap_op))
    {
        ConstExprValue *target_const_val = &value->static_value;
        if (target_const_val->special != ConstValSpecialRuntime) {
            bool depends_on_compile_var = value->static_value.depends_on_compile_var;
            ConstExprValue *out_val = ir_build_const_from(ira, &un_op_instruction->base, depends_on_compile_var);
            bignum_negate(&out_val->data.x_bignum, &target_const_val->data.x_bignum);
            if (expr_type->id == TypeTableEntryIdFloat ||
                expr_type->id == TypeTableEntryIdNumLitFloat ||
                expr_type->id == TypeTableEntryIdNumLitInt)
            {
                return expr_type;
            }

            bool overflow = !bignum_fits_in_bits(&out_val->data.x_bignum, expr_type->data.integral.bit_count, true);
            if (is_wrap_op) {
                if (overflow)
                    out_val->data.x_bignum.is_negative = true;
            } else if (overflow) {
                ir_add_error(ira, &un_op_instruction->base, buf_sprintf("negation caused overflow"));
                return ira->codegen->builtin_types.entry_invalid;
            }
            return expr_type;
        }
    }

    const char *fmt = is_wrap_op ? "invalid wrapping negation type: '%s'" : "invalid negation type: '%s'";
    ir_add_error(ira, &un_op_instruction->base, buf_sprintf(fmt, buf_ptr(&expr_type->name)));
    return ira->codegen->builtin_types.entry_invalid;
}

static TypeTableEntry *ir_analyze_instruction_un_op(IrAnalyze *ira, IrInstructionUnOp *un_op_instruction) {
    IrUnOp op_id = un_op_instruction->op_id;
    switch (op_id) {
        case IrUnOpInvalid:
            zig_unreachable();
        case IrUnOpBinNot:
            zig_panic("TODO analyze PrefixOpBinNot");
            //{
            //    TypeTableEntry *expr_type = analyze_expression(g, import, context, expected_type,
            //            *expr_node);
            //    if (expr_type->id == TypeTableEntryIdInvalid) {
            //        return expr_type;
            //    } else if (expr_type->id == TypeTableEntryIdInt) {
            //        return expr_type;
            //    } else {
            //        add_node_error(g, node, buf_sprintf("unable to perform binary not operation on type '%s'",
            //                buf_ptr(&expr_type->name)));
            //        return g->builtin_types.entry_invalid;
            //    }
            //    // TODO const expr eval
            //}
        case IrUnOpNegation:
        case IrUnOpNegationWrap:
            return ir_analyze_negation(ira, un_op_instruction);
        case IrUnOpAddressOf:
        case IrUnOpConstAddressOf:
            return ir_analyze_unary_address_of(ira, un_op_instruction, op_id == IrUnOpConstAddressOf);
        case IrUnOpDereference:
            return ir_analyze_dereference(ira, un_op_instruction);
        case IrUnOpMaybe:
            return ir_analyze_maybe(ira, un_op_instruction);
        case IrUnOpError:
            return ir_analyze_unary_prefix_op_err(ira, un_op_instruction);
        case IrUnOpUnwrapError:
            zig_panic("TODO analyze PrefixOpUnwrapError");
            //{
            //    TypeTableEntry *type_entry = analyze_expression(g, import, context, nullptr, *expr_node);

            //    if (type_entry->id == TypeTableEntryIdInvalid) {
            //        return type_entry;
            //    } else if (type_entry->id == TypeTableEntryIdErrorUnion) {
            //        return type_entry->data.error.child_type;
            //    } else {
            //        add_node_error(g, *expr_node,
            //            buf_sprintf("expected error type, found '%s'", buf_ptr(&type_entry->name)));
            //        return g->builtin_types.entry_invalid;
            //    }
            //}
        case IrUnOpUnwrapMaybe:
            return ir_analyze_unwrap_maybe(ira, un_op_instruction);
        case IrUnOpErrorReturn:
            zig_panic("TODO analyze IrUnOpErrorReturn");
        case IrUnOpMaybeReturn:
            zig_panic("TODO analyze IrUnOpMaybeReturn");
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_br(IrAnalyze *ira, IrInstructionBr *br_instruction) {
    IrBasicBlock *old_dest_block = br_instruction->dest_block;

    if (br_instruction->is_inline || old_dest_block->ref_count == 1) {
        return ir_inline_bb(ira, &br_instruction->base, old_dest_block);
    }

    IrBasicBlock *new_bb = ir_get_new_bb(ira, old_dest_block);
    ir_build_br_from(&ira->new_irb, &br_instruction->base, new_bb);
    return ir_finish_anal(ira, ira->codegen->builtin_types.entry_unreachable);
}

static TypeTableEntry *ir_analyze_instruction_cond_br(IrAnalyze *ira, IrInstructionCondBr *cond_br_instruction) {
    IrInstruction *condition = cond_br_instruction->condition->other;
    if (condition->type_entry->id == TypeTableEntryIdInvalid)
        return ir_unreach_error(ira);

    if (cond_br_instruction->is_inline || condition->static_value.special != ConstValSpecialRuntime) {
        bool cond_is_true;
        if (!ir_resolve_bool(ira, condition, &cond_is_true))
            return ir_unreach_error(ira);

        IrBasicBlock *old_dest_block = cond_is_true ?
            cond_br_instruction->then_block : cond_br_instruction->else_block;

        if (cond_br_instruction->is_inline || old_dest_block->ref_count == 1)
            return ir_inline_bb(ira, &cond_br_instruction->base, old_dest_block);
    }

    TypeTableEntry *bool_type = ira->codegen->builtin_types.entry_bool;
    IrInstruction *casted_condition = ir_implicit_cast(ira, condition, bool_type);
    if (casted_condition == ira->codegen->invalid_instruction)
        return ir_unreach_error(ira);

    IrBasicBlock *new_then_block = ir_get_new_bb(ira, cond_br_instruction->then_block);
    IrBasicBlock *new_else_block = ir_get_new_bb(ira, cond_br_instruction->else_block);
    ir_build_cond_br_from(&ira->new_irb, &cond_br_instruction->base,
            casted_condition, new_then_block, new_else_block, false);
    return ir_finish_anal(ira, ira->codegen->builtin_types.entry_unreachable);
}

static TypeTableEntry *ir_analyze_instruction_unreachable(IrAnalyze *ira,
        IrInstructionUnreachable *unreachable_instruction)
{
    ir_build_unreachable_from(&ira->new_irb, &unreachable_instruction->base);
    return ir_finish_anal(ira, ira->codegen->builtin_types.entry_unreachable);
}

static TypeTableEntry *ir_analyze_instruction_phi(IrAnalyze *ira, IrInstructionPhi *phi_instruction) {
    if (ira->const_predecessor_bb) {
        for (size_t i = 0; i < phi_instruction->incoming_count; i += 1) {
            IrBasicBlock *predecessor = phi_instruction->incoming_blocks[i];
            if (predecessor != ira->const_predecessor_bb)
                continue;
            IrInstruction *value = phi_instruction->incoming_values[i]->other;
            assert(value->type_entry);
            if (value->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            if (value->static_value.special != ConstValSpecialRuntime) {
                ConstExprValue *out_val = ir_build_const_from(ira, &phi_instruction->base,
                        value->static_value.depends_on_compile_var);
                *out_val = value->static_value;
            } else {
                phi_instruction->base.other = value;
            }
            return value->type_entry;
        }
        zig_unreachable();
    }

    ZigList<IrBasicBlock*> new_incoming_blocks = {0};
    ZigList<IrInstruction*> new_incoming_values = {0};

    for (size_t i = 0; i < phi_instruction->incoming_count; i += 1) {
        IrBasicBlock *predecessor = phi_instruction->incoming_blocks[i];
        if (predecessor->ref_count == 0)
            continue;

        assert(predecessor->other);
        new_incoming_blocks.append(predecessor->other);

        IrInstruction *old_value = phi_instruction->incoming_values[i];
        assert(old_value);
        IrInstruction *new_value = old_value->other;
        if (new_value->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;
        new_incoming_values.append(new_value);
    }
    assert(new_incoming_blocks.length != 0);

    if (new_incoming_blocks.length == 1) {
        IrInstruction *first_value = new_incoming_values.at(0);
        phi_instruction->base.other = first_value;
        return first_value->type_entry;
    }

    TypeTableEntry *resolved_type = ir_resolve_peer_types(ira, phi_instruction->base.source_node,
            new_incoming_values.items, new_incoming_values.length);
    if (resolved_type->id == TypeTableEntryIdInvalid)
        return resolved_type;

    if (resolved_type->id == TypeTableEntryIdNumLitFloat ||
        resolved_type->id == TypeTableEntryIdNumLitInt)
    {
        add_node_error(ira->codegen, phi_instruction->base.source_node,
                buf_sprintf("unable to infer expression type"));
        return ira->codegen->builtin_types.entry_invalid;
    }

    // cast all literal values to the resolved type
    for (size_t i = 0; i < new_incoming_values.length; i += 1) {
        IrInstruction *new_value = new_incoming_values.at(i);
        IrInstruction *casted_value = ir_implicit_cast(ira, new_value, resolved_type);
        new_incoming_values.items[i] = casted_value;
    }

    ir_build_phi_from(&ira->new_irb, &phi_instruction->base, new_incoming_blocks.length,
            new_incoming_blocks.items, new_incoming_values.items);

    return resolved_type;
}

static TypeTableEntry *ir_analyze_var_ptr(IrAnalyze *ira, IrInstruction *instruction, VariableTableEntry *var) {
    assert(var->type);
    if (var->type->id == TypeTableEntryIdInvalid)
        return var->type;

    ConstExprValue *mem_slot = nullptr;
    FnTableEntry *fn_entry = scope_fn_entry(var->parent_scope);
    if (var->src_is_const && var->value) {
        mem_slot = var->value;
        assert(mem_slot->special != ConstValSpecialRuntime);
    } else if (fn_entry) {
        // TODO once the analyze code is fully ported over to IR we won't need this SIZE_MAX thing.
        if (var->mem_slot_index != SIZE_MAX)
            mem_slot = &ira->exec_context.mem_slot_list[var->mem_slot_index];
    }

    if (mem_slot && mem_slot->special != ConstValSpecialRuntime) {
        ConstPtrSpecial ptr_special = var->is_inline ? ConstPtrSpecialInline : ConstPtrSpecialNone;
        return ir_analyze_const_ptr(ira, instruction, mem_slot, var->type, false, ptr_special);
    } else {
        ir_build_var_ptr_from(&ira->new_irb, instruction, var);
        return get_pointer_to_type(ira->codegen, var->type, false);
    }
}

static TypeTableEntry *ir_analyze_instruction_var_ptr(IrAnalyze *ira, IrInstructionVarPtr *var_ptr_instruction) {
    VariableTableEntry *var = var_ptr_instruction->var;
    return ir_analyze_var_ptr(ira, &var_ptr_instruction->base, var);
}

static TypeTableEntry *ir_analyze_instruction_elem_ptr(IrAnalyze *ira, IrInstructionElemPtr *elem_ptr_instruction) {
    IrInstruction *array_ptr = elem_ptr_instruction->array_ptr->other;
    if (array_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *elem_index = elem_ptr_instruction->elem_index->other;
    if (elem_index->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    // This will be a pointer type because elem ptr IR instruction operates on a pointer to a thing.
    TypeTableEntry *ptr_type = array_ptr->type_entry;
    assert(ptr_type->id == TypeTableEntryIdPointer);

    TypeTableEntry *array_type = ptr_type->data.pointer.child_type;
    TypeTableEntry *return_type;

    if (array_type->id == TypeTableEntryIdInvalid) {
        return array_type;
    } else if (array_type->id == TypeTableEntryIdArray) {
        if (array_type->data.array.len == 0) {
            add_node_error(ira->codegen, elem_ptr_instruction->base.source_node,
                    buf_sprintf("index 0 outside array of size 0"));
        }
        TypeTableEntry *child_type = array_type->data.array.child_type;
        return_type = get_pointer_to_type(ira->codegen, child_type, false);
    } else if (array_type->id == TypeTableEntryIdPointer) {
        return_type = array_type;
    } else if (is_slice(array_type)) {
        return_type = array_type->data.structure.fields[0].type_entry;
    } else {
        add_node_error(ira->codegen, elem_ptr_instruction->base.source_node,
                buf_sprintf("array access of non-array type '%s'", buf_ptr(&array_type->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    TypeTableEntry *usize = ira->codegen->builtin_types.entry_usize;
    IrInstruction *casted_elem_index = ir_implicit_cast(ira, elem_index, usize);
    if (casted_elem_index == ira->codegen->invalid_instruction)
        return ira->codegen->builtin_types.entry_invalid;

    bool safety_check_on = elem_ptr_instruction->safety_check_on;
    if (casted_elem_index->static_value.special != ConstValSpecialRuntime) {
        uint64_t index = casted_elem_index->static_value.data.x_bignum.data.x_uint;
        if (array_type->id == TypeTableEntryIdArray) {
            uint64_t array_len = array_type->data.array.len;
            if (index >= array_len) {
                add_node_error(ira->codegen, elem_ptr_instruction->base.source_node,
                    buf_sprintf("index %" PRIu64 " outside array of size %" PRIu64,
                            index, array_len));
                return ira->codegen->builtin_types.entry_invalid;
            }
            safety_check_on = false;
        }

        ConstExprValue *array_ptr_val;
        if (array_ptr->static_value.special != ConstValSpecialRuntime &&
            (array_ptr_val = const_ptr_pointee(&array_ptr->static_value)) &&
            array_ptr_val->special != ConstValSpecialRuntime)
        {
            bool depends_on_compile_var = array_ptr_val->depends_on_compile_var ||
                casted_elem_index->static_value.depends_on_compile_var;
            ConstExprValue *out_val = ir_build_const_from(ira, &elem_ptr_instruction->base, depends_on_compile_var);
            if (array_type->id == TypeTableEntryIdPointer) {
                size_t offset = array_ptr_val->data.x_ptr.index;
                size_t new_index;
                size_t mem_size;
                size_t old_size;
                if (offset == SIZE_MAX) {
                    new_index = SIZE_MAX;
                    mem_size = 1;
                    old_size = 1;
                } else {
                    new_index = offset + index;
                    mem_size = array_ptr_val->data.x_ptr.base_ptr->data.x_array.size;
                    old_size = mem_size - offset;
                }
                if (new_index >= mem_size) {
                    add_node_error(ira->codegen, elem_ptr_instruction->base.source_node,
                        buf_sprintf("index %" PRIu64 " outside pointer of size %" PRIu64, index, old_size));
                    return ira->codegen->builtin_types.entry_invalid;
                }
                out_val->data.x_ptr.base_ptr = array_ptr_val->data.x_ptr.base_ptr;
                out_val->data.x_ptr.index = new_index;
            } else if (is_slice(array_type)) {
                ConstExprValue *ptr_field = &array_ptr_val->data.x_struct.fields[slice_ptr_index];
                ConstExprValue *len_field = &array_ptr_val->data.x_struct.fields[slice_len_index];
                uint64_t slice_len = len_field->data.x_bignum.data.x_uint;
                if (index >= slice_len) {
                    add_node_error(ira->codegen, elem_ptr_instruction->base.source_node,
                        buf_sprintf("index %" PRIu64 " outside slice of size %" PRIu64,
                            index, slice_len));
                    return ira->codegen->builtin_types.entry_invalid;
                }
                out_val->data.x_ptr.base_ptr = ptr_field->data.x_ptr.base_ptr;
                size_t offset = ptr_field->data.x_ptr.index;
                if (offset == SIZE_MAX) {
                    out_val->data.x_ptr.index = SIZE_MAX;
                } else {
                    uint64_t new_index = offset + index;
                    assert(new_index < ptr_field->data.x_ptr.base_ptr->data.x_array.size);
                    out_val->data.x_ptr.index = new_index;
                }
            } else if (array_type->id == TypeTableEntryIdArray) {
                out_val->data.x_ptr.base_ptr = array_ptr_val;
                out_val->data.x_ptr.index = index;
            } else {
                zig_unreachable();
            }
            return return_type;
        }

    }

    ir_build_elem_ptr_from(&ira->new_irb, &elem_ptr_instruction->base, array_ptr,
            casted_elem_index, safety_check_on);
    return return_type;
}

static TypeTableEntry *ir_analyze_container_member_access_inner(IrAnalyze *ira,
    TypeTableEntry *bare_struct_type, Buf *field_name, IrInstructionFieldPtr *field_ptr_instruction,
    IrInstruction *container_ptr, TypeTableEntry *container_type)
{
    if (!is_slice(bare_struct_type)) {
        ScopeDecls *container_scope = get_container_scope(bare_struct_type);
        auto entry = container_scope->decl_table.maybe_get(field_name);
        Tld *tld = entry ? entry->value : nullptr;
        if (tld && tld->id == TldIdFn) {
            resolve_top_level_decl(ira->codegen, tld, false);
            if (tld->resolution == TldResolutionInvalid)
                return ira->codegen->builtin_types.entry_invalid;
            TldFn *tld_fn = (TldFn *)tld;
            FnTableEntry *fn_entry = tld_fn->fn_entry;
            bool depends_on_compile_var = container_ptr->static_value.depends_on_compile_var;
            IrInstruction *bound_fn_value = ir_build_const_bound_fn(&ira->new_irb, field_ptr_instruction->base.scope,
                field_ptr_instruction->base.source_node, fn_entry, container_ptr, depends_on_compile_var);
            return ir_analyze_ref(ira, &field_ptr_instruction->base, bound_fn_value);
        }
    }
    add_node_error(ira->codegen, field_ptr_instruction->base.source_node,
        buf_sprintf("no member named '%s' in '%s'", buf_ptr(field_name), buf_ptr(&bare_struct_type->name)));
    return ira->codegen->builtin_types.entry_invalid;
}


static TypeTableEntry *ir_analyze_container_field_ptr(IrAnalyze *ira, Buf *field_name,
    IrInstructionFieldPtr *field_ptr_instruction, IrInstruction *container_ptr, TypeTableEntry *container_type)
{
    TypeTableEntry *bare_type = container_ref_type(container_type);
    if (!type_is_complete(bare_type))
        resolve_container_type(ira->codegen, bare_type);

    if (bare_type->id == TypeTableEntryIdStruct) {
        TypeStructField *field = find_struct_type_field(bare_type, field_name);
        if (field) {
            ir_build_struct_field_ptr_from(&ira->new_irb, &field_ptr_instruction->base, container_ptr, field);
            return get_pointer_to_type(ira->codegen, field->type_entry, false);
        } else {
            return ir_analyze_container_member_access_inner(ira, bare_type, field_name,
                field_ptr_instruction, container_ptr, container_type);
        }
    } else if (bare_type->id == TypeTableEntryIdEnum) {
        TypeEnumField *field = find_enum_type_field(bare_type, field_name);
        if (field) {
            ir_build_enum_field_ptr_from(&ira->new_irb, &field_ptr_instruction->base, container_ptr, field);
            return get_pointer_to_type(ira->codegen, field->type_entry, false);
        } else {
            return ir_analyze_container_member_access_inner(ira, bare_type, field_name,
                field_ptr_instruction, container_ptr, container_type);
        }
    } else if (bare_type->id == TypeTableEntryIdUnion) {
        zig_panic("TODO");
    } else {
        zig_unreachable();
    }
}

static TypeTableEntry *ir_analyze_decl_ref(IrAnalyze *ira, IrInstruction *source_instruction, Tld *tld,
        bool depends_on_compile_var)
{
    bool pointer_only = false;
    resolve_top_level_decl(ira->codegen, tld, pointer_only);
    if (tld->resolution == TldResolutionInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    switch (tld->id) {
        case TldIdVar:
        {
            TldVar *tld_var = (TldVar *)tld;
            VariableTableEntry *var = tld_var->var;
            return ir_analyze_var_ptr(ira, source_instruction, var);
        }
        case TldIdFn:
        {
            TldFn *tld_fn = (TldFn *)tld;
            FnTableEntry *fn_entry = tld_fn->fn_entry;
            assert(fn_entry->type_entry);

            // TODO instead of allocating this every time, put it in the tld value and we can reference
            // the same one every time
            ConstExprValue *const_val = allocate<ConstExprValue>(1);
            const_val->special = ConstValSpecialStatic;
            const_val->data.x_fn = fn_entry;

            return ir_analyze_const_ptr(ira, source_instruction, const_val, fn_entry->type_entry, depends_on_compile_var, ConstPtrSpecialNone);
        }
        case TldIdContainer:
        {
            TldContainer *tld_container = (TldContainer *)tld;
            assert(tld_container->type_entry);

            // TODO instead of allocating this every time, put it in the tld value and we can reference
            // the same one every time
            ConstExprValue *const_val = allocate<ConstExprValue>(1);
            const_val->special = ConstValSpecialStatic;
            const_val->data.x_type = tld_container->type_entry;

            return ir_analyze_const_ptr(ira, source_instruction, const_val, tld_container->type_entry, depends_on_compile_var, ConstPtrSpecialNone);
        }
        case TldIdTypeDef:
        {
            TldTypeDef *tld_typedef = (TldTypeDef *)tld;
            assert(tld_typedef->type_entry);

            // TODO instead of allocating this every time, put it in the tld value and we can reference
            // the same one every time
            ConstExprValue *const_val = allocate<ConstExprValue>(1);
            const_val->special = ConstValSpecialStatic;
            const_val->data.x_type = tld_typedef->type_entry;

            return ir_analyze_const_ptr(ira, source_instruction, const_val, tld_typedef->type_entry, depends_on_compile_var, ConstPtrSpecialNone);
        }
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_field_ptr(IrAnalyze *ira, IrInstructionFieldPtr *field_ptr_instruction) {
    IrInstruction *container_ptr = field_ptr_instruction->container_ptr->other;
    if (container_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *container_type;
    if (container_ptr->type_entry->id == TypeTableEntryIdPointer) {
        container_type = container_ptr->type_entry->data.pointer.child_type;
    } else if (container_ptr->type_entry->id == TypeTableEntryIdMetaType) {
        container_type = container_ptr->type_entry;
    } else {
        zig_unreachable();
    }

    bool depends_on_compile_var = container_ptr->static_value.depends_on_compile_var;
    Buf *field_name = field_ptr_instruction->field_name;
    AstNode *source_node = field_ptr_instruction->base.source_node;

    if (container_type->id == TypeTableEntryIdInvalid) {
        return container_type;
    } else if (is_container_ref(container_type)) {
        assert(container_ptr->type_entry->id == TypeTableEntryIdPointer);
        return ir_analyze_container_field_ptr(ira, field_name, field_ptr_instruction, container_ptr, container_type);
    } else if (container_type->id == TypeTableEntryIdArray) {
        if (buf_eql_str(field_name, "len")) {
            ConstExprValue *len_val = allocate<ConstExprValue>(1);
            len_val->special = ConstValSpecialStatic;
            bignum_init_unsigned(&len_val->data.x_bignum, container_type->data.array.len);

            TypeTableEntry *usize = ira->codegen->builtin_types.entry_usize;
            return ir_analyze_const_ptr(ira, &field_ptr_instruction->base, len_val, usize, false, ConstPtrSpecialNone);
        } else {
            add_node_error(ira->codegen, source_node,
                buf_sprintf("no member named '%s' in '%s'", buf_ptr(field_name),
                    buf_ptr(&container_type->name)));
            return ira->codegen->builtin_types.entry_invalid;
        }
    } else if (container_type->id == TypeTableEntryIdMetaType) {
        ConstExprValue *container_ptr_val = ir_resolve_const(ira, container_ptr);
        if (!container_ptr_val)
            return ira->codegen->builtin_types.entry_invalid;

        TypeTableEntry *child_type;
        if (container_ptr->type_entry->id == TypeTableEntryIdMetaType) {
            TypeTableEntry *ptr_type = container_ptr_val->data.x_type;
            assert(ptr_type->id == TypeTableEntryIdPointer);
            child_type = ptr_type->data.pointer.child_type;
        } else if (container_ptr->type_entry->id == TypeTableEntryIdPointer) {
            ConstExprValue *child_val = const_ptr_pointee(container_ptr_val);
            child_type = child_val->data.x_type;
        } else {
            zig_unreachable();
        }

        if (child_type->id == TypeTableEntryIdInvalid) {
            return ira->codegen->builtin_types.entry_invalid;
        } else if (is_container(child_type)) {
            if (child_type->id == TypeTableEntryIdEnum) {
                TypeEnumField *field = find_enum_type_field(child_type, field_name);
                if (field) {
                    if (field->type_entry->id == TypeTableEntryIdVoid) {
                        return ir_analyze_const_ptr(ira, &field_ptr_instruction->base, create_const_enum_tag(field->value),
                                child_type, depends_on_compile_var, ConstPtrSpecialNone);
                    } else {
                        zig_panic("TODO enum tag type");
                    }
                }
            }
            ScopeDecls *container_scope = get_container_scope(child_type);
            auto entry = container_scope->decl_table.maybe_get(field_name);
            Tld *tld = entry ? entry->value : nullptr;
            if (tld) {
                return ir_analyze_decl_ref(ira, &field_ptr_instruction->base, tld, depends_on_compile_var);
            }
            ir_add_error(ira, &field_ptr_instruction->base,
                buf_sprintf("container '%s' has no member called '%s'",
                    buf_ptr(&child_type->name), buf_ptr(field_name)));
            return ira->codegen->builtin_types.entry_invalid;
        } else if (child_type->id == TypeTableEntryIdPureError) {
            auto err_table_entry = ira->codegen->error_table.maybe_get(field_name);
            if (err_table_entry) {
                ConstExprValue *const_val = allocate<ConstExprValue>(1);
                const_val->special = ConstValSpecialStatic;
                const_val->data.x_pure_err = err_table_entry->value;

                return ir_analyze_const_ptr(ira, &field_ptr_instruction->base, const_val,
                        child_type, depends_on_compile_var, ConstPtrSpecialNone);
            }

            ir_add_error(ira, &field_ptr_instruction->base,
                buf_sprintf("use of undeclared error value '%s'", buf_ptr(field_name)));
            return ira->codegen->builtin_types.entry_invalid;
        } else if (child_type->id == TypeTableEntryIdInt) {
            if (buf_eql_str(field_name, "bit_count")) {
                return ir_analyze_const_ptr(ira, &field_ptr_instruction->base,
                    create_const_unsigned_negative(child_type->data.integral.bit_count, false),
                    ira->codegen->builtin_types.entry_num_lit_int, depends_on_compile_var, ConstPtrSpecialNone);
            } else if (buf_eql_str(field_name, "is_signed")) {
                return ir_analyze_const_ptr(ira, &field_ptr_instruction->base,
                    create_const_bool(child_type->data.integral.is_signed),
                    ira->codegen->builtin_types.entry_bool, depends_on_compile_var, ConstPtrSpecialNone);
            } else {
                ir_add_error(ira, &field_ptr_instruction->base,
                    buf_sprintf("type '%s' has no member called '%s'",
                        buf_ptr(&child_type->name), buf_ptr(field_name)));
                return ira->codegen->builtin_types.entry_invalid;
            }
        } else {
            ir_add_error(ira, &field_ptr_instruction->base,
                buf_sprintf("type '%s' does not support field access", buf_ptr(&container_type->name)));
            return ira->codegen->builtin_types.entry_invalid;
        }
    } else if (container_type->id == TypeTableEntryIdNamespace) {
        assert(container_ptr->type_entry->id == TypeTableEntryIdPointer);
        ConstExprValue *container_ptr_val = ir_resolve_const(ira, container_ptr);
        if (!container_ptr_val)
            return ira->codegen->builtin_types.entry_invalid;

        ConstExprValue *namespace_val = const_ptr_pointee(container_ptr_val);
        assert(namespace_val->special == ConstValSpecialStatic);

        ImportTableEntry *namespace_import = namespace_val->data.x_import;

        Tld *tld = find_decl(&namespace_import->decls_scope->base, field_name);
        if (!tld) {
            // we must now resolve all the use decls
            // TODO move this check to find_decl?
            for (size_t i = 0; i < namespace_import->use_decls.length; i += 1) {
                AstNode *use_decl_node = namespace_import->use_decls.at(i);
                if (use_decl_node->data.use.resolution == TldResolutionUnresolved) {
                    preview_use_decl(ira->codegen, use_decl_node);
                }
                resolve_use_decl(ira->codegen, use_decl_node);
            }
            tld = find_decl(&namespace_import->decls_scope->base, field_name);
        }
        if (tld) {
            if (tld->visib_mod == VisibModPrivate &&
                tld->import != source_node->owner)
            {
                ErrorMsg *msg = add_node_error(ira->codegen, source_node,
                    buf_sprintf("'%s' is private", buf_ptr(field_name)));
                add_error_note(ira->codegen, msg, tld->source_node, buf_sprintf("declared here"));
                return ira->codegen->builtin_types.entry_invalid;
            }
            return ir_analyze_decl_ref(ira, &field_ptr_instruction->base, tld, depends_on_compile_var);
        } else {
            const char *import_name = namespace_import->path ? buf_ptr(namespace_import->path) : "(C import)";
            add_node_error(ira->codegen, source_node,
                buf_sprintf("no member named '%s' in '%s'", buf_ptr(field_name), import_name));
            return ira->codegen->builtin_types.entry_invalid;
        }
    } else {
        add_node_error(ira->codegen, field_ptr_instruction->base.source_node,
            buf_sprintf("type '%s' does not support field access", buf_ptr(&container_type->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }
}

static TypeTableEntry *ir_analyze_instruction_load_ptr(IrAnalyze *ira, IrInstructionLoadPtr *load_ptr_instruction) {
    IrInstruction *ptr = load_ptr_instruction->ptr->other;
    IrInstruction *result = ir_get_deref(ira, &load_ptr_instruction->base, ptr);
    ir_link_new_instruction(result, &load_ptr_instruction->base);
    assert(result->type_entry);
    return result->type_entry;
}

static TypeTableEntry *ir_analyze_instruction_store_ptr(IrAnalyze *ira, IrInstructionStorePtr *store_ptr_instruction) {
    IrInstruction *ptr = store_ptr_instruction->ptr->other;
    if (ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ptr->type_entry;

    IrInstruction *value = store_ptr_instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return value->type_entry;

    TypeTableEntry *child_type = ptr->type_entry->data.pointer.child_type;
    IrInstruction *casted_value = ir_implicit_cast(ira, value, child_type);
    if (casted_value == ira->codegen->invalid_instruction)
        return ira->codegen->builtin_types.entry_invalid;

    if (ptr->static_value.special != ConstValSpecialRuntime) {
        bool is_inline = (ptr->static_value.data.x_ptr.special == ConstPtrSpecialInline);
        if (casted_value->static_value.special != ConstValSpecialRuntime) {
            ConstExprValue *dest_val = const_ptr_pointee(&ptr->static_value);
            if (dest_val->special != ConstValSpecialRuntime) {
                *dest_val = casted_value->static_value;
                return ir_analyze_void(ira, &store_ptr_instruction->base);
            }
        }
        if (is_inline) {
            ir_add_error(ira, &store_ptr_instruction->base,
                    buf_sprintf("cannot store runtime value in compile time variable"));
            return ira->codegen->builtin_types.entry_invalid;
        }
    }

    if (ptr->static_value.special != ConstValSpecialRuntime) {
        // This memory location is transforming from known at compile time to known at runtime.
        // We must emit our own var ptr instruction.
        // TODO can we delete this code now that we have inline var?
        ptr->static_value.special = ConstValSpecialRuntime;
        IrInstruction *new_ptr_inst;
        if (ptr->id == IrInstructionIdVarPtr) {
            IrInstructionVarPtr *var_ptr_inst = (IrInstructionVarPtr *)ptr;
            VariableTableEntry *var = var_ptr_inst->var;
            new_ptr_inst = ir_build_var_ptr(&ira->new_irb, store_ptr_instruction->base.scope,
                store_ptr_instruction->base.source_node, var);
            assert(var->mem_slot_index != SIZE_MAX);
            ConstExprValue *mem_slot = &ira->exec_context.mem_slot_list[var->mem_slot_index];
            mem_slot->special = ConstValSpecialRuntime;
        } else if (ptr->id == IrInstructionIdFieldPtr) {
            zig_panic("TODO");
        } else if (ptr->id == IrInstructionIdElemPtr) {
            zig_panic("TODO");
        } else {
            zig_unreachable();
        }
        new_ptr_inst->type_entry = ptr->type_entry;
        ir_build_store_ptr(&ira->new_irb, store_ptr_instruction->base.scope,
            store_ptr_instruction->base.source_node, new_ptr_inst, casted_value);
        return ir_analyze_void(ira, &store_ptr_instruction->base);
    }

    ir_build_store_ptr_from(&ira->new_irb, &store_ptr_instruction->base, ptr, casted_value);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_typeof(IrAnalyze *ira, IrInstructionTypeOf *typeof_instruction) {
    IrInstruction *expr_value = typeof_instruction->value->other;
    TypeTableEntry *type_entry = expr_value->type_entry;
    switch (type_entry->id) {
        case TypeTableEntryIdInvalid:
            return type_entry;
        case TypeTableEntryIdVar:
            add_node_error(ira->codegen, expr_value->source_node,
                    buf_sprintf("type '%s' not eligible for @typeOf", buf_ptr(&type_entry->name)));
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdBoundFn:
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdTypeDecl:
            {
                ConstExprValue *out_val = ir_build_const_from(ira, &typeof_instruction->base, false);
                // TODO depends_on_compile_var should be set based on whether the type of the expression
                // depends_on_compile_var. but we currently don't have a thing to tell us if the type of
                // something depends on a compile var
                out_val->data.x_type = type_entry;

                return ira->codegen->builtin_types.entry_type;
            }
    }

    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_to_ptr_type(IrAnalyze *ira,
        IrInstructionToPtrType *to_ptr_type_instruction)
{
    IrInstruction *type_value = to_ptr_type_instruction->value->other;
    TypeTableEntry *type_entry = ir_resolve_type(ira, type_value);
    if (type_entry->id == TypeTableEntryIdInvalid)
        return type_entry;

    TypeTableEntry *ptr_type;
    if (type_entry->id == TypeTableEntryIdArray) {
        ptr_type = get_pointer_to_type(ira->codegen, type_entry->data.array.child_type, false);
    } else if (is_slice(type_entry)) {
        ptr_type = type_entry->data.structure.fields[0].type_entry;
    } else {
        add_node_error(ira->codegen, to_ptr_type_instruction->base.source_node,
                buf_sprintf("expected array type, found '%s'", buf_ptr(&type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    ConstExprValue *out_val = ir_build_const_from(ira, &to_ptr_type_instruction->base,
            type_value->static_value.depends_on_compile_var);
    out_val->data.x_type = ptr_type;
    return ira->codegen->builtin_types.entry_type;
}

static TypeTableEntry *ir_analyze_instruction_ptr_type_child(IrAnalyze *ira,
        IrInstructionPtrTypeChild *ptr_type_child_instruction)
{
    IrInstruction *type_value = ptr_type_child_instruction->value->other;
    TypeTableEntry *type_entry = ir_resolve_type(ira, type_value);
    if (type_entry->id == TypeTableEntryIdInvalid)
        return type_entry;

    if (type_entry->id != TypeTableEntryIdPointer) {
        add_node_error(ira->codegen, ptr_type_child_instruction->base.source_node,
                buf_sprintf("expected pointer type, found '%s'", buf_ptr(&type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    ConstExprValue *out_val = ir_build_const_from(ira, &ptr_type_child_instruction->base,
            type_value->static_value.depends_on_compile_var);
    out_val->data.x_type = type_entry->data.pointer.child_type;
    return ira->codegen->builtin_types.entry_type;
}

static TypeTableEntry *ir_analyze_instruction_set_fn_test(IrAnalyze *ira,
        IrInstructionSetFnTest *set_fn_test_instruction)
{
    IrInstruction *fn_value = set_fn_test_instruction->fn_value->other;

    FnTableEntry *fn_entry = ir_resolve_fn(ira, fn_value);
    if (!fn_entry)
        return ira->codegen->builtin_types.entry_invalid;

    if (!fn_entry->is_test) {
        fn_entry->is_test = true;
        ira->codegen->test_fn_count += 1;
    }

    ir_build_const_from(ira, &set_fn_test_instruction->base, false);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_set_fn_visible(IrAnalyze *ira,
        IrInstructionSetFnVisible *set_fn_visible_instruction)
{
    IrInstruction *fn_value = set_fn_visible_instruction->fn_value->other;
    IrInstruction *is_visible_value = set_fn_visible_instruction->is_visible->other;

    FnTableEntry *fn_entry = ir_resolve_fn(ira, fn_value);
    if (!fn_entry)
        return ira->codegen->builtin_types.entry_invalid;

    bool want_export;
    if (!ir_resolve_bool(ira, is_visible_value, &want_export))
        return ira->codegen->builtin_types.entry_invalid;

    AstNode *source_node = set_fn_visible_instruction->base.source_node;
    if (fn_entry->fn_export_set_node) {
        ErrorMsg *msg = add_node_error(ira->codegen, source_node,
                buf_sprintf("function visibility set twice"));
        add_error_note(ira->codegen, msg, fn_entry->fn_export_set_node, buf_sprintf("first set here"));
        return ira->codegen->builtin_types.entry_invalid;
    }
    fn_entry->fn_export_set_node = source_node;

    AstNodeFnProto *fn_proto = &fn_entry->proto_node->data.fn_proto;
    if (fn_proto->visib_mod != VisibModExport) {
        ErrorMsg *msg = add_node_error(ira->codegen, source_node,
            buf_sprintf("function must be marked export to set function visibility"));
        add_error_note(ira->codegen, msg, fn_entry->proto_node, buf_sprintf("function declared here"));
        return ira->codegen->builtin_types.entry_invalid;
    }
    fn_entry->internal_linkage = !want_export;

    ir_build_const_from(ira, &set_fn_visible_instruction->base, false);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_set_debug_safety(IrAnalyze *ira,
        IrInstructionSetDebugSafety *set_debug_safety_instruction)
{
    IrInstruction *target_instruction = set_debug_safety_instruction->scope_value->other;
    TypeTableEntry *target_type = target_instruction->type_entry;
    if (target_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;
    ConstExprValue *target_val = ir_resolve_const(ira, target_instruction);
    if (!target_val)
        return ira->codegen->builtin_types.entry_invalid;

    bool *safety_off_ptr;
    AstNode **safety_set_node_ptr;
    if (target_type->id == TypeTableEntryIdBlock) {
        ScopeBlock *block_scope = (ScopeBlock *)target_val->data.x_block;
        safety_off_ptr = &block_scope->safety_off;
        safety_set_node_ptr = &block_scope->safety_set_node;
    } else if (target_type->id == TypeTableEntryIdFn) {
        FnTableEntry *target_fn = target_val->data.x_fn;
        assert(target_fn->def_scope);
        safety_off_ptr = &target_fn->def_scope->safety_off;
        safety_set_node_ptr = &target_fn->def_scope->safety_set_node;
    } else if (target_type->id == TypeTableEntryIdMetaType) {
        ScopeDecls *decls_scope;
        TypeTableEntry *type_arg = target_val->data.x_type;
        if (type_arg->id == TypeTableEntryIdStruct) {
            decls_scope = type_arg->data.structure.decls_scope;
        } else if (type_arg->id == TypeTableEntryIdEnum) {
            decls_scope = type_arg->data.enumeration.decls_scope;
        } else if (type_arg->id == TypeTableEntryIdUnion) {
            decls_scope = type_arg->data.unionation.decls_scope;
        } else {
            add_node_error(ira->codegen, target_instruction->source_node,
                buf_sprintf("expected scope reference, found type '%s'", buf_ptr(&type_arg->name)));
            return ira->codegen->builtin_types.entry_invalid;
        }
        safety_off_ptr = &decls_scope->safety_off;
        safety_set_node_ptr = &decls_scope->safety_set_node;
    } else {
        add_node_error(ira->codegen, target_instruction->source_node,
            buf_sprintf("expected scope reference, found type '%s'", buf_ptr(&target_type->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    IrInstruction *debug_safety_on_value = set_debug_safety_instruction->debug_safety_on->other;
    bool want_debug_safety;
    if (!ir_resolve_bool(ira, debug_safety_on_value, &want_debug_safety))
        return ira->codegen->builtin_types.entry_invalid;

    AstNode *source_node = set_debug_safety_instruction->base.source_node;
    if (*safety_set_node_ptr) {
        ErrorMsg *msg = add_node_error(ira->codegen, source_node,
                buf_sprintf("function test attribute set twice"));
        add_error_note(ira->codegen, msg, *safety_set_node_ptr, buf_sprintf("first set here"));
        return ira->codegen->builtin_types.entry_invalid;
    }
    *safety_set_node_ptr = source_node;
    *safety_off_ptr = !want_debug_safety;

    ir_build_const_from(ira, &set_debug_safety_instruction->base, false);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_slice_type(IrAnalyze *ira,
        IrInstructionSliceType *slice_type_instruction)
{
    IrInstruction *child_type = slice_type_instruction->child_type->other;
    if (child_type->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;
    bool is_const = slice_type_instruction->is_const;

    TypeTableEntry *resolved_child_type = ir_resolve_type(ira, child_type);
    TypeTableEntry *canon_child_type = get_underlying_type(resolved_child_type);
    switch (canon_child_type->id) {
        case TypeTableEntryIdTypeDecl:
            zig_unreachable();
        case TypeTableEntryIdInvalid:
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdVar:
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdBlock:
            add_node_error(ira->codegen, slice_type_instruction->base.source_node,
                    buf_sprintf("slice of type '%s' not allowed", buf_ptr(&resolved_child_type->name)));
            // TODO if this is a typedecl, add error note showing the declaration of the type decl
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBoundFn:
            {
                TypeTableEntry *result_type = get_slice_type(ira->codegen, resolved_child_type, is_const);
                ConstExprValue *out_val = ir_build_const_from(ira, &slice_type_instruction->base,
                        child_type->static_value.depends_on_compile_var);
                out_val->data.x_type = result_type;
                return ira->codegen->builtin_types.entry_type;
            }
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_asm(IrAnalyze *ira, IrInstructionAsm *asm_instruction) {
    assert(asm_instruction->base.source_node->type == NodeTypeAsmExpr);

    if (!ir_emit_global_runtime_side_effect(ira, &asm_instruction->base))
        return ira->codegen->builtin_types.entry_invalid;

    // TODO validate the output types and variable types

    AstNodeAsmExpr *asm_expr = &asm_instruction->base.source_node->data.asm_expr;

    IrInstruction **input_list = allocate<IrInstruction *>(asm_expr->input_list.length);
    IrInstruction **output_types = allocate<IrInstruction *>(asm_expr->output_list.length);

    TypeTableEntry *return_type = ira->codegen->builtin_types.entry_void;
    for (size_t i = 0; i < asm_expr->output_list.length; i += 1) {
        AsmOutput *asm_output = asm_expr->output_list.at(i);
        if (asm_output->return_type) {
            output_types[i] = asm_instruction->output_types[i]->other;
            return_type = ir_resolve_type(ira, output_types[i]);
            if (return_type->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;
        }
    }

    for (size_t i = 0; i < asm_expr->input_list.length; i += 1) {
        input_list[i] = asm_instruction->input_list[i]->other;
        if (input_list[i]->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;
    }

    ir_build_asm_from(&ira->new_irb, &asm_instruction->base, input_list, output_types,
        asm_instruction->output_vars, asm_instruction->return_count, asm_instruction->has_side_effects);
    return return_type;
}

static TypeTableEntry *ir_analyze_instruction_array_type(IrAnalyze *ira,
        IrInstructionArrayType *array_type_instruction)
{
    IrInstruction *size_value = array_type_instruction->size->other;
    uint64_t size;
    if (!ir_resolve_usize(ira, size_value, &size))
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *child_type_value = array_type_instruction->child_type->other;
    TypeTableEntry *child_type = ir_resolve_type(ira, child_type_value);
    TypeTableEntry *canon_child_type = get_underlying_type(child_type);
    switch (canon_child_type->id) {
        case TypeTableEntryIdTypeDecl:
            zig_unreachable();
        case TypeTableEntryIdInvalid:
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdVar:
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdBlock:
            add_node_error(ira->codegen, array_type_instruction->base.source_node,
                    buf_sprintf("array of type '%s' not allowed", buf_ptr(&child_type->name)));
            // TODO if this is a typedecl, add error note showing the declaration of the type decl
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBoundFn:
            {
                TypeTableEntry *result_type = get_array_type(ira->codegen, child_type, size);
                bool depends_on_compile_var = child_type_value->static_value.depends_on_compile_var ||
                    size_value->static_value.depends_on_compile_var;
                ConstExprValue *out_val = ir_build_const_from(ira, &array_type_instruction->base,
                        depends_on_compile_var);
                out_val->data.x_type = result_type;
                return ira->codegen->builtin_types.entry_type;
            }
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_compile_var(IrAnalyze *ira,
        IrInstructionCompileVar *compile_var_instruction)
{
    IrInstruction *name_value = compile_var_instruction->name->other;
    Buf *var_name = ir_resolve_str(ira, name_value);
    if (!var_name)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *out_val = ir_build_const_from(ira, &compile_var_instruction->base, true);
    if (buf_eql_str(var_name, "is_big_endian")) {
        out_val->data.x_bool = ira->codegen->is_big_endian;
        return ira->codegen->builtin_types.entry_bool;
    } else if (buf_eql_str(var_name, "is_release")) {
        out_val->data.x_bool = ira->codegen->is_release_build;
        return ira->codegen->builtin_types.entry_bool;
    } else if (buf_eql_str(var_name, "is_test")) {
        out_val->data.x_bool = ira->codegen->is_test_build;
        return ira->codegen->builtin_types.entry_bool;
    } else if (buf_eql_str(var_name, "os")) {
        out_val->data.x_enum.tag = ira->codegen->target_os_index;
        return ira->codegen->builtin_types.entry_os_enum;
    } else if (buf_eql_str(var_name, "arch")) {
        out_val->data.x_enum.tag = ira->codegen->target_arch_index;
        return ira->codegen->builtin_types.entry_arch_enum;
    } else if (buf_eql_str(var_name, "environ")) {
        out_val->data.x_enum.tag = ira->codegen->target_environ_index;
        return ira->codegen->builtin_types.entry_environ_enum;
    } else if (buf_eql_str(var_name, "object_format")) {
        out_val->data.x_enum.tag = ira->codegen->target_oformat_index;
        return ira->codegen->builtin_types.entry_oformat_enum;
    } else {
        add_node_error(ira->codegen, name_value->source_node,
            buf_sprintf("unrecognized compile variable: '%s'", buf_ptr(var_name)));
        return ira->codegen->builtin_types.entry_invalid;
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_size_of(IrAnalyze *ira,
        IrInstructionSizeOf *size_of_instruction)
{
    IrInstruction *type_value = size_of_instruction->type_value->other;
    TypeTableEntry *type_entry = ir_resolve_type(ira, type_value);
    TypeTableEntry *canon_type_entry = get_underlying_type(type_entry);
    switch (canon_type_entry->id) {
        case TypeTableEntryIdInvalid:
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdTypeDecl:
            zig_unreachable();
        case TypeTableEntryIdVar:
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdBoundFn:
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdNamespace:
            add_node_error(ira->codegen, size_of_instruction->base.source_node,
                    buf_sprintf("no size available for type '%s'", buf_ptr(&type_entry->name)));
            // TODO if this is a typedecl, add error note showing the declaration of the type decl
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
            {
                uint64_t size_in_bytes = type_size(ira->codegen, type_entry);
                bool depends_on_compile_var = false; // TODO types should be able to depend on compile var
                ConstExprValue *out_val = ir_build_const_from(ira, &size_of_instruction->base,
                        depends_on_compile_var);
                bignum_init_unsigned(&out_val->data.x_bignum, size_in_bytes);
                return ira->codegen->builtin_types.entry_num_lit_int;
            }
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_test_null(IrAnalyze *ira,
        IrInstructionTestNull *test_null_instruction)
{
    IrInstruction *value = test_null_instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    // This will be a pointer type because test null IR instruction operates on a pointer to a thing.
    TypeTableEntry *ptr_type = value->type_entry;
    assert(ptr_type->id == TypeTableEntryIdPointer);

    TypeTableEntry *type_entry = ptr_type->data.pointer.child_type;
    if (type_entry->id != TypeTableEntryIdMaybe) {
        add_node_error(ira->codegen, test_null_instruction->base.source_node,
                buf_sprintf("expected nullable type, found '%s'", buf_ptr(&type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    if (value->static_value.special != ConstValSpecialRuntime) {
        ConstExprValue *maybe_val = value->static_value.data.x_ptr.base_ptr;
        assert(value->static_value.data.x_ptr.index == SIZE_MAX);

        if (maybe_val->special != ConstValSpecialRuntime) {
            bool depends_on_compile_var = maybe_val->depends_on_compile_var;
            ConstExprValue *out_val = ir_build_const_from(ira, &test_null_instruction->base,
                    depends_on_compile_var);
            out_val->data.x_bool = (maybe_val->data.x_maybe == nullptr);
            return ira->codegen->builtin_types.entry_bool;
        }
    }

    ir_build_test_null_from(&ira->new_irb, &test_null_instruction->base, value);
    return ira->codegen->builtin_types.entry_bool;
}

static TypeTableEntry *ir_analyze_instruction_unwrap_maybe(IrAnalyze *ira,
        IrInstructionUnwrapMaybe *unwrap_maybe_instruction)
{
    IrInstruction *value = unwrap_maybe_instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    // This will be a pointer type because test null IR instruction operates on a pointer to a thing.
    TypeTableEntry *ptr_type = value->type_entry;
    assert(ptr_type->id == TypeTableEntryIdPointer);

    TypeTableEntry *type_entry = ptr_type->data.pointer.child_type;
    if (type_entry->id == TypeTableEntryIdInvalid) {
        return ira->codegen->builtin_types.entry_invalid;
    } else if (type_entry->id != TypeTableEntryIdMaybe) {
        add_node_error(ira->codegen, unwrap_maybe_instruction->base.source_node,
                buf_sprintf("expected nullable type, found '%s'", buf_ptr(&type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }
    TypeTableEntry *child_type = type_entry->data.maybe.child_type;
    TypeTableEntry *result_type = get_pointer_to_type(ira->codegen, child_type, false);

    if (value->static_value.special != ConstValSpecialRuntime) {
        ConstExprValue *maybe_val = value->static_value.data.x_ptr.base_ptr;
        assert(value->static_value.data.x_ptr.index == SIZE_MAX);

        if (maybe_val->special != ConstValSpecialRuntime) {
            if (!maybe_val->data.x_maybe) {
                ir_add_error(ira, &unwrap_maybe_instruction->base, buf_sprintf("unable to unwrap null"));
                return ira->codegen->builtin_types.entry_invalid;
            }
            bool depends_on_compile_var = maybe_val->depends_on_compile_var;
            ConstExprValue *out_val = ir_build_const_from(ira, &unwrap_maybe_instruction->base,
                    depends_on_compile_var);
            out_val->data.x_ptr.base_ptr = maybe_val->data.x_maybe;
            out_val->data.x_ptr.index = SIZE_MAX;
            return result_type;
        }
    }

    ir_build_unwrap_maybe_from(&ira->new_irb, &unwrap_maybe_instruction->base, value,
            unwrap_maybe_instruction->safety_check_on);
    return result_type;
}

static TypeTableEntry *ir_analyze_instruction_ctz(IrAnalyze *ira, IrInstructionCtz *ctz_instruction) {
    IrInstruction *value = ctz_instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid) {
        return ira->codegen->builtin_types.entry_invalid;
    } else if (value->type_entry->id == TypeTableEntryIdInt) {
        if (value->static_value.special != ConstValSpecialRuntime) {
            uint32_t result = bignum_ctz(&value->static_value.data.x_bignum,
                    value->type_entry->data.integral.bit_count);
            bool depends_on_compile_var = value->static_value.depends_on_compile_var;
            ConstExprValue *out_val = ir_build_const_from(ira, &ctz_instruction->base,
                    depends_on_compile_var);
            bignum_init_unsigned(&out_val->data.x_bignum, result);
            return value->type_entry;
        }

        ir_build_ctz_from(&ira->new_irb, &ctz_instruction->base, value);
        return value->type_entry;
    } else {
        add_node_error(ira->codegen, ctz_instruction->base.source_node,
            buf_sprintf("expected integer type, found '%s'", buf_ptr(&value->type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }
}

static TypeTableEntry *ir_analyze_instruction_clz(IrAnalyze *ira, IrInstructionClz *clz_instruction) {
    IrInstruction *value = clz_instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid) {
        return ira->codegen->builtin_types.entry_invalid;
    } else if (value->type_entry->id == TypeTableEntryIdInt) {
        if (value->static_value.special != ConstValSpecialRuntime) {
            uint32_t result = bignum_clz(&value->static_value.data.x_bignum,
                    value->type_entry->data.integral.bit_count);
            bool depends_on_compile_var = value->static_value.depends_on_compile_var;
            ConstExprValue *out_val = ir_build_const_from(ira, &clz_instruction->base,
                    depends_on_compile_var);
            bignum_init_unsigned(&out_val->data.x_bignum, result);
            return value->type_entry;
        }

        ir_build_clz_from(&ira->new_irb, &clz_instruction->base, value);
        return value->type_entry;
    } else {
        add_node_error(ira->codegen, clz_instruction->base.source_node,
            buf_sprintf("expected integer type, found '%s'", buf_ptr(&value->type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }
}

static TypeTableEntry *ir_analyze_instruction_switch_br(IrAnalyze *ira,
        IrInstructionSwitchBr *switch_br_instruction)
{
    IrInstruction *target_value = switch_br_instruction->target_value->other;
    if (target_value->type_entry->id == TypeTableEntryIdInvalid)
        return ir_unreach_error(ira);

    size_t case_count = switch_br_instruction->case_count;
    bool is_inline = ir_should_inline(&ira->new_irb) || switch_br_instruction->is_inline;

    if (is_inline || target_value->static_value.special != ConstValSpecialRuntime) {
        ConstExprValue *target_val = ir_resolve_const(ira, target_value);
        if (!target_val)
            return ir_unreach_error(ira);

        for (size_t i = 0; i < case_count; i += 1) {
            IrInstructionSwitchBrCase *old_case = &switch_br_instruction->cases[i];
            IrInstruction *case_value = old_case->value->other;
            if (case_value->type_entry->id == TypeTableEntryIdInvalid)
                return ir_unreach_error(ira);

            IrInstruction *casted_case_value = ir_implicit_cast(ira, case_value, target_value->type_entry);
            if (casted_case_value->type_entry->id == TypeTableEntryIdInvalid)
                return ir_unreach_error(ira);

            ConstExprValue *case_val = ir_resolve_const(ira, casted_case_value);
            if (!case_val)
                return ir_unreach_error(ira);

            if (const_values_equal(target_val, case_val, target_value->type_entry)) {
                IrBasicBlock *old_dest_block = old_case->block;
                if (is_inline || old_dest_block->ref_count == 1) {
                    return ir_inline_bb(ira, &switch_br_instruction->base, old_dest_block);
                } else {
                    IrBasicBlock *new_dest_block = ir_get_new_bb(ira, old_dest_block);
                    ir_build_br_from(&ira->new_irb, &switch_br_instruction->base, new_dest_block);
                    return ir_finish_anal(ira, ira->codegen->builtin_types.entry_unreachable);
                }
            }
        }

    }

    IrInstructionSwitchBrCase *cases = allocate<IrInstructionSwitchBrCase>(case_count);
    for (size_t i = 0; i < case_count; i += 1) {
        IrInstructionSwitchBrCase *old_case = &switch_br_instruction->cases[i];
        IrInstructionSwitchBrCase *new_case = &cases[i];
        new_case->block = ir_get_new_bb(ira, old_case->block);
        new_case->value = ira->codegen->invalid_instruction;

        IrInstruction *old_value = old_case->value;
        IrInstruction *new_value = old_value->other;
        if (new_value->type_entry->id == TypeTableEntryIdInvalid)
            continue;

        IrInstruction *casted_new_value = ir_implicit_cast(ira, new_value, target_value->type_entry);
        if (casted_new_value->type_entry->id == TypeTableEntryIdInvalid)
            continue;

        if (!ir_resolve_const(ira, casted_new_value))
            continue;

        new_case->value = casted_new_value;
    }

    IrBasicBlock *new_else_block = ir_get_new_bb(ira, switch_br_instruction->else_block);
    ir_build_switch_br_from(&ira->new_irb, &switch_br_instruction->base,
            target_value, new_else_block, case_count, cases, is_inline);
    return ir_finish_anal(ira, ira->codegen->builtin_types.entry_unreachable);
}

static TypeTableEntry *ir_analyze_instruction_switch_target(IrAnalyze *ira,
        IrInstructionSwitchTarget *switch_target_instruction)
{
    IrInstruction *target_value_ptr = switch_target_instruction->target_value_ptr->other;
    if (target_value_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    assert(target_value_ptr->type_entry->id == TypeTableEntryIdPointer);
    TypeTableEntry *target_type = target_value_ptr->type_entry->data.pointer.child_type;
    bool depends_on_compile_var = target_value_ptr->static_value.depends_on_compile_var;
    ConstExprValue *pointee_val = nullptr;
    if (target_value_ptr->static_value.special != ConstValSpecialRuntime) {
        pointee_val = const_ptr_pointee(&target_value_ptr->static_value);
        if (pointee_val->special == ConstValSpecialRuntime)
            pointee_val = nullptr;
    }
    TypeTableEntry *canon_target_type = get_underlying_type(target_type);
    switch (canon_target_type->id) {
        case TypeTableEntryIdInvalid:
        case TypeTableEntryIdVar:
        case TypeTableEntryIdTypeDecl:
            zig_unreachable();
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdBool:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdPureError:
            if (pointee_val) {
                ConstExprValue *out_val = ir_build_const_from(ira, &switch_target_instruction->base,
                        depends_on_compile_var);
                *out_val = *pointee_val;
                return target_type;
            }

            ir_build_load_ptr_from(&ira->new_irb, &switch_target_instruction->base, target_value_ptr);
            return target_type;
        case TypeTableEntryIdEnum:
            {
                TypeTableEntry *tag_type = target_type->data.enumeration.tag_type;
                if (pointee_val) {
                    ConstExprValue *out_val = ir_build_const_from(ira, &switch_target_instruction->base,
                            depends_on_compile_var);
                    bignum_init_unsigned(&out_val->data.x_bignum, pointee_val->data.x_enum.tag);
                    return tag_type;
                }

                ir_build_enum_tag_from(&ira->new_irb, &switch_target_instruction->base, target_value_ptr);
                return tag_type;
            }
        case TypeTableEntryIdErrorUnion:
            // see https://github.com/andrewrk/zig/issues/83
            zig_panic("TODO switch on error union");
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdBoundFn:
            add_node_error(ira->codegen, switch_target_instruction->base.source_node,
                buf_sprintf("invalid switch target type '%s'", buf_ptr(&target_type->name)));
            // TODO if this is a typedecl, add error note showing the declaration of the type decl
            return ira->codegen->builtin_types.entry_invalid;
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_switch_var(IrAnalyze *ira,
        IrInstructionSwitchVar *switch_var_instruction)
{
    zig_panic("TODO switch var analyze");
}

static TypeTableEntry *ir_analyze_instruction_enum_tag(IrAnalyze *ira,
        IrInstructionEnumTag *enum_tag_instruction)
{
    zig_panic("TODO ir_analyze_instruction_enum_tag");
}

static TypeTableEntry *ir_analyze_instruction_static_eval(IrAnalyze *ira,
        IrInstructionStaticEval *static_eval_instruction)
{
    IrInstruction *value = static_eval_instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *val = ir_resolve_const(ira, value);
    if (!val)
        return ira->codegen->builtin_types.entry_invalid;

    ConstExprValue *out_val = ir_build_const_from(ira, &static_eval_instruction->base, val->depends_on_compile_var);
    *out_val = *val;
    return value->type_entry;
}

static TypeTableEntry *ir_analyze_instruction_import(IrAnalyze *ira, IrInstructionImport *import_instruction) {
    IrInstruction *name_value = import_instruction->name->other;
    Buf *import_target_str = ir_resolve_str(ira, name_value);
    if (!import_target_str)
        return ira->codegen->builtin_types.entry_invalid;
    bool depends_on_compile_var = name_value->static_value.depends_on_compile_var;

    AstNode *source_node = import_instruction->base.source_node;
    ImportTableEntry *import = source_node->owner;

    Buf *import_target_path;
    Buf *search_dir;
    assert(import->package);
    PackageTableEntry *target_package;
    auto package_entry = import->package->package_table.maybe_get(import_target_str);
    if (package_entry) {
        target_package = package_entry->value;
        import_target_path = &target_package->root_src_path;
        search_dir = &target_package->root_src_dir;
    } else {
        // try it as a filename
        target_package = import->package;
        import_target_path = import_target_str;
        search_dir = &import->package->root_src_dir;
    }

    Buf full_path = BUF_INIT;
    os_path_join(search_dir, import_target_path, &full_path);

    Buf *import_code = buf_alloc();
    Buf *abs_full_path = buf_alloc();
    int err;
    if ((err = os_path_real(&full_path, abs_full_path))) {
        if (err == ErrorFileNotFound) {
            add_node_error(ira->codegen, source_node,
                    buf_sprintf("unable to find '%s'", buf_ptr(import_target_path)));
            return ira->codegen->builtin_types.entry_invalid;
        } else {
            ira->codegen->error_during_imports = true;
            add_node_error(ira->codegen, source_node,
                    buf_sprintf("unable to open '%s': %s", buf_ptr(&full_path), err_str(err)));
            return ira->codegen->builtin_types.entry_invalid;
        }
    }

    auto import_entry = ira->codegen->import_table.maybe_get(abs_full_path);
    if (import_entry) {
        ConstExprValue *out_val = ir_build_const_from(ira, &import_instruction->base, depends_on_compile_var);
        out_val->data.x_import = import_entry->value;
        return ira->codegen->builtin_types.entry_namespace;
    }

    if ((err = os_fetch_file_path(abs_full_path, import_code))) {
        if (err == ErrorFileNotFound) {
            add_node_error(ira->codegen, source_node,
                    buf_sprintf("unable to find '%s'", buf_ptr(import_target_path)));
            return ira->codegen->builtin_types.entry_invalid;
        } else {
            add_node_error(ira->codegen, source_node,
                    buf_sprintf("unable to open '%s': %s", buf_ptr(&full_path), err_str(err)));
            return ira->codegen->builtin_types.entry_invalid;
        }
    }
    ImportTableEntry *target_import = add_source_file(ira->codegen, target_package,
            abs_full_path, search_dir, import_target_path, import_code);

    scan_decls(ira->codegen, target_import, target_import->decls_scope, target_import->root, nullptr);

    ConstExprValue *out_val = ir_build_const_from(ira, &import_instruction->base, depends_on_compile_var);
    out_val->data.x_import = target_import;
    return ira->codegen->builtin_types.entry_namespace;

}

static TypeTableEntry *ir_analyze_instruction_array_len(IrAnalyze *ira,
        IrInstructionArrayLen *array_len_instruction)
{
    IrInstruction *array_value = array_len_instruction->array_value->other;
    TypeTableEntry *canon_type = get_underlying_type(array_value->type_entry);
    if (canon_type->id == TypeTableEntryIdInvalid) {
        return ira->codegen->builtin_types.entry_invalid;
    } else if (canon_type->id == TypeTableEntryIdArray) {
        bool depends_on_compile_var = array_value->static_value.depends_on_compile_var;
        return ir_analyze_const_usize(ira, &array_len_instruction->base,
                canon_type->data.array.len, depends_on_compile_var);
    } else if (is_slice(canon_type)) {
        if (array_value->static_value.special != ConstValSpecialRuntime) {
            ConstExprValue *len_val = &array_value->static_value.data.x_struct.fields[slice_len_index];
            if (len_val->special != ConstValSpecialRuntime) {
                bool depends_on_compile_var = len_val->depends_on_compile_var;
                return ir_analyze_const_usize(ira, &array_len_instruction->base,
                        len_val->data.x_bignum.data.x_uint, depends_on_compile_var);
            }
        }
        TypeStructField *field = &canon_type->data.structure.fields[slice_len_index];
        IrInstruction *len_ptr = ir_build_struct_field_ptr(&ira->new_irb, array_len_instruction->base.scope,
                array_len_instruction->base.source_node, array_value, field);
        len_ptr->type_entry = get_pointer_to_type(ira->codegen, ira->codegen->builtin_types.entry_usize, true);
        ir_build_load_ptr_from(&ira->new_irb, &array_len_instruction->base, len_ptr);
        return ira->codegen->builtin_types.entry_usize;
    } else {
        add_node_error(ira->codegen, array_len_instruction->base.source_node,
            buf_sprintf("type '%s' has no field 'len'", buf_ptr(&array_value->type_entry->name)));
        // TODO if this is a typedecl, add error note showing the declaration of the type decl
        return ira->codegen->builtin_types.entry_invalid;
    }
}

static TypeTableEntry *ir_analyze_instruction_ref(IrAnalyze *ira, IrInstructionRef *ref_instruction) {
    IrInstruction *value = ref_instruction->value->other;
    return ir_analyze_ref(ira, &ref_instruction->base, value);
}

static TypeTableEntry *ir_analyze_container_init_fields(IrAnalyze *ira, IrInstruction *instruction,
    TypeTableEntry *container_type, size_t instr_field_count, IrInstructionContainerInitFieldsField *fields,
    bool depends_on_compile_var)
{
    size_t actual_field_count = container_type->data.structure.src_field_count;

    IrInstruction *first_non_const_instruction = nullptr;

    AstNode **field_assign_nodes = allocate<AstNode *>(actual_field_count);

    IrInstructionStructInitField *new_fields = allocate<IrInstructionStructInitField>(actual_field_count);

    FnTableEntry *fn_entry = exec_fn_entry(ira->new_irb.exec);
    bool outside_fn = (fn_entry == nullptr);

    ConstExprValue const_val = {};
    const_val.special = ConstValSpecialStatic;
    const_val.depends_on_compile_var = depends_on_compile_var;
    const_val.data.x_struct.fields = allocate<ConstExprValue>(actual_field_count);
    for (size_t i = 0; i < instr_field_count; i += 1) {
        IrInstructionContainerInitFieldsField *field = &fields[i];

        IrInstruction *field_value = field->value->other;
        if (field_value->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;

        TypeStructField *type_field = find_struct_type_field(container_type, field->name);
        if (!type_field) {
            add_node_error(ira->codegen, field->source_node,
                buf_sprintf("no member named '%s' in '%s'",
                    buf_ptr(field->name), buf_ptr(&container_type->name)));
            return ira->codegen->builtin_types.entry_invalid;
        }

        if (type_field->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;

        size_t field_index = type_field->src_index;
        AstNode *existing_assign_node = field_assign_nodes[field_index];
        if (existing_assign_node) {
            ErrorMsg *msg = add_node_error(ira->codegen, field->source_node, buf_sprintf("duplicate field"));
            add_error_note(ira->codegen, msg, existing_assign_node, buf_sprintf("other field here"));
            continue;
        }
        field_assign_nodes[field_index] = field->source_node;

        new_fields[field_index].value = field_value;
        new_fields[field_index].type_struct_field = type_field;

        if (const_val.special == ConstValSpecialStatic) {
            if (outside_fn || field_value->static_value.special != ConstValSpecialRuntime) {
                ConstExprValue *field_val = ir_resolve_const(ira, field_value);
                if (!field_val)
                    return ira->codegen->builtin_types.entry_invalid;

                const_val.data.x_struct.fields[field_index] = *field_val;
                const_val.depends_on_compile_var = const_val.depends_on_compile_var || field_val->depends_on_compile_var;
            } else {
                first_non_const_instruction = field_value;
                const_val.special = ConstValSpecialRuntime;
            }
        }
    }

    bool any_missing = false;
    for (size_t i = 0; i < actual_field_count; i += 1) {
        if (!field_assign_nodes[i]) {
            add_node_error(ira->codegen, instruction->source_node,
                buf_sprintf("missing field: '%s'", buf_ptr(container_type->data.structure.fields[i].name)));
            any_missing = true;
        }
    }
    if (any_missing)
        return ira->codegen->builtin_types.entry_invalid;

    if (const_val.special == ConstValSpecialStatic) {
        ConstExprValue *out_val = ir_build_const_from(ira, instruction, const_val.depends_on_compile_var);
        *out_val = const_val;
        return container_type;
    }

    if (outside_fn) {
        add_node_error(ira->codegen, first_non_const_instruction->source_node,
            buf_sprintf("unable to evaluate constant expression"));
        return ira->codegen->builtin_types.entry_invalid;
    }

    IrInstruction *new_instruction = ir_build_struct_init_from(&ira->new_irb, instruction,
        container_type, actual_field_count, new_fields);

    ir_add_alloca(ira, new_instruction, container_type);
    return container_type;
}

static TypeTableEntry *ir_analyze_instruction_container_init_list(IrAnalyze *ira, IrInstructionContainerInitList *instruction) {
    IrInstruction *container_type_value = instruction->container_type->other;
    TypeTableEntry *container_type = ir_resolve_type(ira, container_type_value);
    if (container_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    size_t elem_count = instruction->item_count;
    bool depends_on_compile_var = container_type_value->static_value.depends_on_compile_var;

    if (container_type->id == TypeTableEntryIdStruct && !is_slice(container_type) && elem_count == 0) {
        return ir_analyze_container_init_fields(ira, &instruction->base, container_type, 0, nullptr, depends_on_compile_var);
    } else if (is_slice(container_type)) {
        TypeTableEntry *pointer_type = container_type->data.structure.fields[slice_ptr_index].type_entry;
        assert(pointer_type->id == TypeTableEntryIdPointer);
        TypeTableEntry *child_type = pointer_type->data.pointer.child_type;

        ConstExprValue const_val = {};
        const_val.special = ConstValSpecialStatic;
        const_val.depends_on_compile_var = depends_on_compile_var;
        const_val.data.x_array.elements = allocate<ConstExprValue>(elem_count);
        const_val.data.x_array.size = elem_count;

        FnTableEntry *fn_entry = exec_fn_entry(ira->new_irb.exec);
        bool outside_fn = (fn_entry == nullptr);

        IrInstruction **new_items = allocate<IrInstruction *>(elem_count);

        IrInstruction *first_non_const_instruction = nullptr;

        for (size_t i = 0; i < elem_count; i += 1) {
            IrInstruction *arg_value = instruction->items[i]->other;
            if (arg_value->type_entry->id == TypeTableEntryIdInvalid)
                return ira->codegen->builtin_types.entry_invalid;

            new_items[i] = arg_value;

            if (const_val.special == ConstValSpecialStatic) {
                if (outside_fn || arg_value->static_value.special != ConstValSpecialRuntime) {
                    ConstExprValue *elem_val = ir_resolve_const(ira, arg_value);
                    if (!elem_val)
                        return ira->codegen->builtin_types.entry_invalid;

                    const_val.data.x_array.elements[i] = *elem_val;
                    const_val.depends_on_compile_var = const_val.depends_on_compile_var || elem_val->depends_on_compile_var;
                } else {
                    first_non_const_instruction = arg_value;
                    const_val.special = ConstValSpecialRuntime;
                }
            }
        }

        TypeTableEntry *fixed_size_array_type = get_array_type(ira->codegen, child_type, elem_count);
        if (const_val.special == ConstValSpecialStatic) {
            ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, const_val.depends_on_compile_var);
            *out_val = const_val;
            return fixed_size_array_type;
        }

        if (outside_fn) {
            add_node_error(ira->codegen, first_non_const_instruction->source_node,
                buf_sprintf("unable to evaluate constant expression"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        IrInstruction *new_instruction = ir_build_container_init_list_from(&ira->new_irb, &instruction->base,
            container_type_value, elem_count, new_items);
        ir_add_alloca(ira, new_instruction, fixed_size_array_type);
        return fixed_size_array_type;
    } else if (container_type->id == TypeTableEntryIdArray) {
        // same as slice init but we make a compile error if the length is wrong
        zig_panic("TODO array container init");
    } else if (container_type->id == TypeTableEntryIdVoid) {
        if (elem_count != 0) {
            add_node_error(ira->codegen, instruction->base.source_node,
                buf_sprintf("void expression expects no arguments"));
            return ira->codegen->builtin_types.entry_invalid;
        }
        return ir_analyze_void(ira, &instruction->base);
    } else {
        add_node_error(ira->codegen, instruction->base.source_node,
            buf_sprintf("type '%s' does not support array initialization",
                buf_ptr(&container_type->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }
}

static TypeTableEntry *ir_analyze_instruction_container_init_fields(IrAnalyze *ira, IrInstructionContainerInitFields *instruction) {
    IrInstruction *container_type_value = instruction->container_type->other;
    TypeTableEntry *container_type = ir_resolve_type(ira, container_type_value);
    if (container_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    bool depends_on_compile_var = container_type_value->static_value.depends_on_compile_var;

    return ir_analyze_container_init_fields(ira, &instruction->base, container_type,
        instruction->field_count, instruction->fields, depends_on_compile_var);
}

static TypeTableEntry *ir_analyze_min_max(IrAnalyze *ira, IrInstruction *source_instruction,
        IrInstruction *target_type_value, bool is_max)
{
    TypeTableEntry *target_type = ir_resolve_type(ira, target_type_value);
    bool depends_on_compile_var = target_type_value->static_value.depends_on_compile_var;
    TypeTableEntry *canon_type = get_underlying_type(target_type);
    switch (canon_type->id) {
        case TypeTableEntryIdInvalid:
            return ira->codegen->builtin_types.entry_invalid;
        case TypeTableEntryIdInt:
            {
                ConstExprValue *out_val = ir_build_const_from(ira, source_instruction, depends_on_compile_var);
                eval_min_max_value(ira->codegen, canon_type, out_val, is_max);
                return ira->codegen->builtin_types.entry_num_lit_int;
            }
        case TypeTableEntryIdFloat:
            {
                ConstExprValue *out_val = ir_build_const_from(ira, source_instruction, depends_on_compile_var);
                eval_min_max_value(ira->codegen, canon_type, out_val, is_max);
                return ira->codegen->builtin_types.entry_num_lit_float;
            }
        case TypeTableEntryIdBool:
        case TypeTableEntryIdVoid:
            {
                ConstExprValue *out_val = ir_build_const_from(ira, source_instruction, depends_on_compile_var);
                eval_min_max_value(ira->codegen, canon_type, out_val, is_max);
                return target_type;
            }
        case TypeTableEntryIdVar:
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
        case TypeTableEntryIdTypeDecl:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdBoundFn:
            {
                const char *err_format = is_max ?
                    "no max value available for type '%s'" :
                    "no min value available for type '%s'";
                ir_add_error(ira, source_instruction,
                        buf_sprintf(err_format, buf_ptr(&target_type->name)));
                // TODO if this is a typedecl, add error note showing the declaration of the type decl
                return ira->codegen->builtin_types.entry_invalid;
            }
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_min_value(IrAnalyze *ira,
        IrInstructionMinValue *instruction)
{
    return ir_analyze_min_max(ira, &instruction->base, instruction->value->other, false);
}

static TypeTableEntry *ir_analyze_instruction_max_value(IrAnalyze *ira,
        IrInstructionMaxValue *instruction)
{
    return ir_analyze_min_max(ira, &instruction->base, instruction->value->other, true);
}

static TypeTableEntry *ir_analyze_instruction_compile_err(IrAnalyze *ira,
        IrInstructionCompileErr *instruction)
{
    IrInstruction *msg_value = instruction->msg->other;
    Buf *msg_buf = ir_resolve_str(ira, msg_value);
    if (!msg_buf)
        return ira->codegen->builtin_types.entry_invalid;

    ir_add_error(ira, &instruction->base, msg_buf);
    return ira->codegen->builtin_types.entry_invalid;
}

static TypeTableEntry *ir_analyze_instruction_err_name(IrAnalyze *ira, IrInstructionErrName *instruction) {
    IrInstruction *value = instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_value = ir_implicit_cast(ira, value, value->type_entry);
    if (casted_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *str_type = get_slice_type(ira->codegen, ira->codegen->builtin_types.entry_u8, true);
    if (casted_value->static_value.special == ConstValSpecialStatic) {
        ErrorTableEntry *err = casted_value->static_value.data.x_pure_err;
        if (!err->cached_error_name_val) {
            err->cached_error_name_val = allocate<ConstExprValue>(1);
            err->cached_error_name_val->special = ConstValSpecialStatic;
            err->cached_error_name_val->data.x_struct.fields = allocate<ConstExprValue>(2);

            ConstExprValue *array_val = allocate<ConstExprValue>(1);
            init_const_str_lit(array_val, &err->name);

            ConstExprValue *ptr_val = &err->cached_error_name_val->data.x_struct.fields[slice_ptr_index];
            ptr_val->special = ConstValSpecialStatic;
            ptr_val->data.x_ptr.base_ptr = array_val;
            ptr_val->data.x_ptr.index = 0;

            ConstExprValue *len_val = &err->cached_error_name_val->data.x_struct.fields[slice_len_index];
            len_val->special = ConstValSpecialStatic;
            bignum_init_unsigned(&len_val->data.x_bignum, buf_len(&err->name));
        }
        ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base,
            casted_value->static_value.depends_on_compile_var);
        *out_val = *err->cached_error_name_val;
        return str_type;
    }

    ira->codegen->generate_error_name_table = true;
    ir_build_err_name_from(&ira->new_irb, &instruction->base, value);
    return str_type;
}

static TypeTableEntry *ir_analyze_instruction_c_import(IrAnalyze *ira, IrInstructionCImport *instruction) {
    AstNode *node = instruction->base.source_node;
    assert(node->type == NodeTypeFnCallExpr);
    AstNode *block_node = node->data.fn_call_expr.params.at(0);

    ScopeCImport *cimport_scope = create_cimport_scope(node, instruction->base.scope);

    // Execute the C import block like an inline function
    TypeTableEntry *void_type = ira->codegen->builtin_types.entry_void;
    IrInstruction *result = ir_eval_const_value(ira->codegen, &cimport_scope->base, block_node, void_type,
        ira->new_irb.exec->backward_branch_count, ira->new_irb.exec->backward_branch_quota, nullptr, &cimport_scope->buf);
    if (result->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    find_libc_include_path(ira->codegen);

    ImportTableEntry *child_import = allocate<ImportTableEntry>(1);
    child_import->decls_scope = create_decls_scope(child_import->root, nullptr, nullptr, child_import);
    child_import->c_import_node = node;

    ZigList<ErrorMsg *> errors = {0};

    int err;
    if ((err = parse_h_buf(child_import, &errors, &cimport_scope->buf, ira->codegen, node))) {
        zig_panic("unable to parse h file: %s\n", err_str(err));
    }

    if (errors.length > 0) {
        ErrorMsg *parent_err_msg = add_node_error(ira->codegen, node, buf_sprintf("C import failed"));
        for (size_t i = 0; i < errors.length; i += 1) {
            ErrorMsg *err_msg = errors.at(i);
            err_msg_add_note(parent_err_msg, err_msg);
        }

        return ira->codegen->builtin_types.entry_invalid;
    }

    if (ira->codegen->verbose) {
        fprintf(stderr, "\nC imports:\n");
        fprintf(stderr, "-----------\n");
        ir_print_decls(stderr, child_import);
    }

    // TODO to get fewer false negatives on this, we would need to track this value in
    // the ir executable
    bool depends_on_compile_var = true;
    ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);
    out_val->data.x_import = child_import;
    return ira->codegen->builtin_types.entry_namespace;
}

static TypeTableEntry *ir_analyze_instruction_c_include(IrAnalyze *ira, IrInstructionCInclude *instruction) {
    IrInstruction *name_value = instruction->name->other;
    if (name_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    Buf *include_name = ir_resolve_str(ira, name_value);
    if (!include_name)
        return ira->codegen->builtin_types.entry_invalid;

    Buf *c_import_buf = exec_c_import_buf(ira->new_irb.exec);
    // We check for this error in pass1
    assert(c_import_buf);

    buf_appendf(c_import_buf, "#include <%s>\n", buf_ptr(include_name));

    ir_build_const_from(ira, &instruction->base, false);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_c_define(IrAnalyze *ira, IrInstructionCDefine *instruction) {
    IrInstruction *name = instruction->name->other;
    if (name->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    Buf *define_name = ir_resolve_str(ira, name);
    if (!define_name)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *value = instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    Buf *define_value = ir_resolve_str(ira, value);
    if (!define_value)
        return ira->codegen->builtin_types.entry_invalid;

    Buf *c_import_buf = exec_c_import_buf(ira->new_irb.exec);
    // We check for this error in pass1
    assert(c_import_buf);

    buf_appendf(c_import_buf, "#define %s %s\n", buf_ptr(define_name), buf_ptr(define_value));

    ir_build_const_from(ira, &instruction->base, false);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_c_undef(IrAnalyze *ira, IrInstructionCUndef *instruction) {
    IrInstruction *name = instruction->name->other;
    if (name->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    Buf *undef_name = ir_resolve_str(ira, name);
    if (!undef_name)
        return ira->codegen->builtin_types.entry_invalid;

    Buf *c_import_buf = exec_c_import_buf(ira->new_irb.exec);
    // We check for this error in pass1
    assert(c_import_buf);

    buf_appendf(c_import_buf, "#undef %s\n", buf_ptr(undef_name));

    ir_build_const_from(ira, &instruction->base, false);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_embed_file(IrAnalyze *ira, IrInstructionEmbedFile *instruction) {
    IrInstruction *name = instruction->name->other;
    if (name->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    Buf *rel_file_path = ir_resolve_str(ira, name);
    if (!rel_file_path)
        return ira->codegen->builtin_types.entry_invalid;

    ImportTableEntry *import = get_scope_import(instruction->base.scope);
    // figure out absolute path to resource
    Buf source_dir_path = BUF_INIT;
    os_path_dirname(import->path, &source_dir_path);

    Buf file_path = BUF_INIT;
    os_path_resolve(&source_dir_path, rel_file_path, &file_path);

    // load from file system into const expr
    Buf file_contents = BUF_INIT;
    int err;
    if ((err = os_fetch_file_path(&file_path, &file_contents))) {
        if (err == ErrorFileNotFound) {
            ir_add_error(ira, instruction->name, buf_sprintf("unable to find '%s'", buf_ptr(&file_path)));
            return ira->codegen->builtin_types.entry_invalid;
        } else {
            ir_add_error(ira, instruction->name, buf_sprintf("unable to open '%s': %s", buf_ptr(&file_path), err_str(err)));
            return ira->codegen->builtin_types.entry_invalid;
        }
    }

    // TODO add dependency on the file we embedded so that we know if it changes
    // we'll have to invalidate the cache

    bool depends_on_compile_var = true;
    ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);
    init_const_str_lit(out_val, &file_contents);

    return get_array_type(ira->codegen, ira->codegen->builtin_types.entry_u8, buf_len(&file_contents));
}

static TypeTableEntry *ir_analyze_instruction_cmpxchg(IrAnalyze *ira, IrInstructionCmpxchg *instruction) {
    IrInstruction *ptr = instruction->ptr->other;
    if (ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *cmp_value = instruction->cmp_value->other;
    if (cmp_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *new_value = instruction->new_value->other;
    if (new_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *success_order_value = instruction->success_order_value->other;
    if (success_order_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    AtomicOrder success_order;
    if (!ir_resolve_atomic_order(ira, success_order_value, &success_order))
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *failure_order_value = instruction->failure_order_value->other;
    if (failure_order_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    AtomicOrder failure_order;
    if (!ir_resolve_atomic_order(ira, failure_order_value, &failure_order))
        return ira->codegen->builtin_types.entry_invalid;

    if (ptr->type_entry->id != TypeTableEntryIdPointer) {
        ir_add_error(ira, instruction->ptr,
            buf_sprintf("expected pointer argument, found '%s'", buf_ptr(&ptr->type_entry->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    TypeTableEntry *child_type = ptr->type_entry->data.pointer.child_type;

    IrInstruction *casted_cmp_value = ir_implicit_cast(ira, cmp_value, child_type);
    if (casted_cmp_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_new_value = ir_implicit_cast(ira, new_value, child_type);
    if (casted_new_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    if (success_order < AtomicOrderMonotonic) {
        ir_add_error(ira, success_order_value,
                buf_sprintf("success atomic ordering must be Monotonic or stricter"));
        return ira->codegen->builtin_types.entry_invalid;
    }
    if (failure_order < AtomicOrderMonotonic) {
        ir_add_error(ira, failure_order_value,
                buf_sprintf("failure atomic ordering must be Monotonic or stricter"));
        return ira->codegen->builtin_types.entry_invalid;
    }
    if (failure_order > success_order) {
        ir_add_error(ira, failure_order_value,
                buf_sprintf("failure atomic ordering must be no stricter than success"));
        return ira->codegen->builtin_types.entry_invalid;
    }
    if (failure_order == AtomicOrderRelease || failure_order == AtomicOrderAcqRel) {
        ir_add_error(ira, failure_order_value,
                buf_sprintf("failure atomic ordering must not be Release or AcqRel"));
        return ira->codegen->builtin_types.entry_invalid;
    }

    ir_build_cmpxchg_from(&ira->new_irb, &instruction->base, ptr, casted_cmp_value, casted_new_value,
        success_order_value, failure_order_value, success_order, failure_order);
    return ira->codegen->builtin_types.entry_bool;
}

static TypeTableEntry *ir_analyze_instruction_fence(IrAnalyze *ira, IrInstructionFence *instruction) {
    IrInstruction *order_value = instruction->order_value->other;
    if (order_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    AtomicOrder order;
    if (!ir_resolve_atomic_order(ira, order_value, &order))
        return ira->codegen->builtin_types.entry_invalid;

    ir_build_fence_from(&ira->new_irb, &instruction->base, order_value, order);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_div_exact(IrAnalyze *ira, IrInstructionDivExact *instruction) {
    IrInstruction *op1 = instruction->op1->other;
    if (op1->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *op2 = instruction->op2->other;
    if (op2->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;


    IrInstruction *peer_instructions[] = { op1, op2 };
    TypeTableEntry *result_type = ir_resolve_peer_types(ira, instruction->base.source_node, peer_instructions, 2);

    if (result_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *canon_type = get_underlying_type(result_type);

    if (canon_type->id != TypeTableEntryIdInt &&
        canon_type->id != TypeTableEntryIdNumLitInt)
    {
        ir_add_error(ira, &instruction->base,
                buf_sprintf("expected integer type, found '%s'", buf_ptr(&result_type->name)));
        // TODO if meta_type is type decl, add note pointing to type decl declaration
        return ira->codegen->builtin_types.entry_invalid;
    }

    IrInstruction *casted_op1 = ir_implicit_cast(ira, op1, result_type);
    if (casted_op1->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_op2 = ir_implicit_cast(ira, op2, result_type);
    if (casted_op2->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    if (casted_op1->static_value.special == ConstValSpecialStatic &&
        casted_op2->static_value.special == ConstValSpecialStatic)
    {
        ConstExprValue *op1_val = ir_resolve_const(ira, casted_op1);
        ConstExprValue *op2_val = ir_resolve_const(ira, casted_op2);
        assert(op1_val);
        assert(op2_val);

        if (op1_val->data.x_bignum.data.x_uint == 0) {
            ir_add_error(ira, &instruction->base, buf_sprintf("division by zero"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        BigNum remainder;
        if (bignum_mod(&remainder, &op1_val->data.x_bignum, &op2_val->data.x_bignum)) {
            ir_add_error(ira, &instruction->base, buf_sprintf("integer overflow"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        if (remainder.data.x_uint != 0) {
            ir_add_error(ira, &instruction->base, buf_sprintf("exact division had a remainder"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        bool depends_on_compile_var = casted_op1->static_value.depends_on_compile_var ||
            casted_op2->static_value.depends_on_compile_var;
        ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);
        bignum_div(&out_val->data.x_bignum, &op1_val->data.x_bignum, &op2_val->data.x_bignum);
        return result_type;
    }

    ir_build_div_exact_from(&ira->new_irb, &instruction->base, casted_op1, casted_op2);
    return result_type;
}

static TypeTableEntry *ir_analyze_instruction_truncate(IrAnalyze *ira, IrInstructionTruncate *instruction) {
    IrInstruction *dest_type_value = instruction->dest_type->other;
    TypeTableEntry *dest_type = ir_resolve_type(ira, dest_type_value);
    TypeTableEntry *canon_dest_type = get_underlying_type(dest_type);

    if (canon_dest_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    if (canon_dest_type->id != TypeTableEntryIdInt &&
        canon_dest_type->id != TypeTableEntryIdNumLitInt)
    {
        ir_add_error(ira, dest_type_value, buf_sprintf("expected integer type, found '%s'", buf_ptr(&dest_type->name)));
        // TODO if meta_type is type decl, add note pointing to type decl declaration
        return ira->codegen->builtin_types.entry_invalid;
    }

    IrInstruction *target = instruction->target->other;
    TypeTableEntry *src_type = target->type_entry;
    TypeTableEntry *canon_src_type = get_underlying_type(src_type);
    if (canon_src_type->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    if (canon_src_type->id != TypeTableEntryIdInt &&
        canon_src_type->id != TypeTableEntryIdNumLitInt)
    {
        ir_add_error(ira, target, buf_sprintf("expected integer type, found '%s'", buf_ptr(&src_type->name)));
        // TODO if meta_type is type decl, add note pointing to type decl declaration
        return ira->codegen->builtin_types.entry_invalid;
    }

    if (canon_src_type->data.integral.is_signed != canon_dest_type->data.integral.is_signed) {
        const char *sign_str = canon_dest_type->data.integral.is_signed ? "signed" : "unsigned";
        ir_add_error(ira, target, buf_sprintf("expected %s integer type, found '%s'", sign_str, buf_ptr(&src_type->name)));
        // TODO if meta_type is type decl, add note pointing to type decl declaration
        return ira->codegen->builtin_types.entry_invalid;
    } else if (canon_src_type->data.integral.bit_count <= canon_dest_type->data.integral.bit_count) {
        ir_add_error(ira, target, buf_sprintf("type '%s' has same or fewer bits than destination type '%s'",
                    buf_ptr(&src_type->name), buf_ptr(&dest_type->name)));
        // TODO if meta_type is type decl, add note pointing to type decl declaration
        return ira->codegen->builtin_types.entry_invalid;
    }

    if (target->static_value.special == ConstValSpecialStatic) {
        bool depends_on_compile_var = dest_type_value->static_value.depends_on_compile_var || target->static_value.depends_on_compile_var;
        ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);
        bignum_init_bignum(&out_val->data.x_bignum, &target->static_value.data.x_bignum);
        bignum_truncate(&out_val->data.x_bignum, canon_dest_type->data.integral.bit_count);
        return dest_type;
    }

    ir_build_truncate_from(&ira->new_irb, &instruction->base, dest_type_value, target);
    return dest_type;
}

static TypeTableEntry *ir_analyze_instruction_int_type(IrAnalyze *ira, IrInstructionIntType *instruction) {
    IrInstruction *is_signed_value = instruction->is_signed->other;
    bool is_signed;
    if (!ir_resolve_bool(ira, is_signed_value, &is_signed))
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *bit_count_value = instruction->bit_count->other;
    uint64_t bit_count;
    if (!ir_resolve_usize(ira, bit_count_value, &bit_count))
        return ira->codegen->builtin_types.entry_invalid;

    bool depends_on_compile_var = is_signed_value->static_value.depends_on_compile_var ||
        bit_count_value->static_value.depends_on_compile_var;

    ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);
    out_val->data.x_type = get_int_type(ira->codegen, is_signed, bit_count);
    return ira->codegen->builtin_types.entry_type;
}

static TypeTableEntry *ir_analyze_instruction_bool_not(IrAnalyze *ira, IrInstructionBoolNot *instruction) {
    IrInstruction *value = instruction->value->other;
    if (value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *bool_type = ira->codegen->builtin_types.entry_bool;

    IrInstruction *casted_value = ir_implicit_cast(ira, value, bool_type);
    if (casted_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    if (casted_value->static_value.special != ConstValSpecialRuntime) {
        bool depends_on_compile_var = casted_value->static_value.depends_on_compile_var;
        ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);
        out_val->data.x_bool = !casted_value->static_value.data.x_bool;
        return bool_type;
    }

    ir_build_bool_not_from(&ira->new_irb, &instruction->base, casted_value);
    return bool_type;
}

static TypeTableEntry *ir_analyze_instruction_alloca(IrAnalyze *ira, IrInstructionAlloca *instruction) {
    IrInstruction *type_value = instruction->type_value->other;
    if (type_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *count_value = instruction->count->other;
    if (count_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *child_type = ir_resolve_type(ira, type_value);
    TypeTableEntry *canon_type = get_underlying_type(child_type);

    if (count_value->static_value.special == ConstValSpecialStatic) {
        // this should be the same as an array declaration

        uint64_t count;
        if (!ir_resolve_usize(ira, count_value, &count))
            return ira->codegen->builtin_types.entry_invalid;

        zig_panic("TODO alloca with compile time known count");
    }

    switch (canon_type->id) {
        case TypeTableEntryIdInvalid:
        case TypeTableEntryIdTypeDecl:
            zig_unreachable();
        case TypeTableEntryIdBool:
        case TypeTableEntryIdVoid:
        case TypeTableEntryIdInt:
        case TypeTableEntryIdFloat:
        case TypeTableEntryIdPointer:
        case TypeTableEntryIdArray:
        case TypeTableEntryIdStruct:
        case TypeTableEntryIdMaybe:
        case TypeTableEntryIdErrorUnion:
        case TypeTableEntryIdPureError:
        case TypeTableEntryIdEnum:
        case TypeTableEntryIdUnion:
        case TypeTableEntryIdFn:
            {
                TypeTableEntry *slice_type = get_slice_type(ira->codegen, child_type, false);
                IrInstruction *new_instruction = ir_build_alloca_from(&ira->new_irb, &instruction->base, type_value, count_value);
                ir_add_alloca(ira, new_instruction, slice_type);
                return slice_type;
            }
        case TypeTableEntryIdVar:
        case TypeTableEntryIdMetaType:
        case TypeTableEntryIdUnreachable:
        case TypeTableEntryIdNumLitFloat:
        case TypeTableEntryIdNumLitInt:
        case TypeTableEntryIdUndefLit:
        case TypeTableEntryIdNullLit:
        case TypeTableEntryIdNamespace:
        case TypeTableEntryIdBlock:
        case TypeTableEntryIdBoundFn:
            ir_add_error(ira, type_value,
                buf_sprintf("invalid alloca type '%s'", buf_ptr(&child_type->name)));
            // TODO if this is a typedecl, add error note showing the declaration of the type decl
            return ira->codegen->builtin_types.entry_invalid;
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction_memset(IrAnalyze *ira, IrInstructionMemset *instruction) {
    IrInstruction *dest_ptr = instruction->dest_ptr->other;
    if (dest_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *byte_value = instruction->byte->other;
    if (byte_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *count_value = instruction->count->other;
    if (count_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *usize = ira->codegen->builtin_types.entry_usize;
    TypeTableEntry *u8 = ira->codegen->builtin_types.entry_u8;
    TypeTableEntry *u8_ptr = get_pointer_to_type(ira->codegen, u8, false);

    IrInstruction *casted_dest_ptr = ir_implicit_cast(ira, dest_ptr, u8_ptr);
    if (casted_dest_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_byte = ir_implicit_cast(ira, byte_value, u8);
    if (casted_byte->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_count = ir_implicit_cast(ira, count_value, usize);
    if (casted_count->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    if (casted_dest_ptr->static_value.special == ConstValSpecialStatic &&
        casted_byte->static_value.special == ConstValSpecialStatic &&
        casted_count->static_value.special == ConstValSpecialStatic)
    {
        ConstExprValue *dest_ptr_val = &casted_dest_ptr->static_value;

        ConstExprValue *dest_elements;
        size_t start;
        size_t bound_end;
        if (dest_ptr_val->data.x_ptr.index == SIZE_MAX) {
            dest_elements = dest_ptr_val->data.x_ptr.base_ptr;
            start = 0;
            bound_end = 1;
        } else {
            ConstExprValue *array_val = dest_ptr_val->data.x_ptr.base_ptr;
            dest_elements = array_val->data.x_array.elements;
            start = dest_ptr_val->data.x_ptr.index;
            bound_end = array_val->data.x_array.size;
        }

        size_t count = casted_count->static_value.data.x_bignum.data.x_uint;
        size_t end = start + count;
        if (end > bound_end) {
            ir_add_error(ira, count_value, buf_sprintf("out of bounds pointer access"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        ConstExprValue *byte_val = &casted_byte->static_value;
        for (size_t i = start; i < end; i += 1) {
            dest_elements[i] = *byte_val;
        }

        ir_build_const_from(ira, &instruction->base, false);
        return ira->codegen->builtin_types.entry_void;
    }

    ir_build_memset_from(&ira->new_irb, &instruction->base, casted_dest_ptr, casted_byte, casted_count);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_memcpy(IrAnalyze *ira, IrInstructionMemcpy *instruction) {
    IrInstruction *dest_ptr = instruction->dest_ptr->other;
    if (dest_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *src_ptr = instruction->src_ptr->other;
    if (src_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *count_value = instruction->count->other;
    if (count_value->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *usize = ira->codegen->builtin_types.entry_usize;
    TypeTableEntry *u8 = ira->codegen->builtin_types.entry_u8;
    TypeTableEntry *u8_ptr_mut = get_pointer_to_type(ira->codegen, u8, false);
    TypeTableEntry *u8_ptr_const = get_pointer_to_type(ira->codegen, u8, true);

    IrInstruction *casted_dest_ptr = ir_implicit_cast(ira, dest_ptr, u8_ptr_mut);
    if (casted_dest_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_src_ptr = ir_implicit_cast(ira, src_ptr, u8_ptr_const);
    if (casted_src_ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *casted_count = ir_implicit_cast(ira, count_value, usize);
    if (casted_count->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    if (casted_dest_ptr->static_value.special == ConstValSpecialStatic &&
        casted_src_ptr->static_value.special == ConstValSpecialStatic &&
        casted_count->static_value.special == ConstValSpecialStatic)
    {
        size_t count = casted_count->static_value.data.x_bignum.data.x_uint;

        ConstExprValue *dest_ptr_val = &casted_dest_ptr->static_value;
        ConstExprValue *dest_elements;
        size_t dest_start;
        size_t dest_end;
        if (dest_ptr_val->data.x_ptr.index == SIZE_MAX) {
            dest_elements = dest_ptr_val->data.x_ptr.base_ptr;
            dest_start = 0;
            dest_end = 1;
        } else {
            ConstExprValue *array_val = dest_ptr_val->data.x_ptr.base_ptr;
            dest_elements = array_val->data.x_array.elements;
            dest_start = dest_ptr_val->data.x_ptr.index;
            dest_end = array_val->data.x_array.size;
        }

        if (dest_start + count > dest_end) {
            ir_add_error(ira, &instruction->base, buf_sprintf("out of bounds pointer access"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        ConstExprValue *src_ptr_val = &casted_src_ptr->static_value;
        ConstExprValue *src_elements;
        size_t src_start;
        size_t src_end;
        if (src_ptr_val->data.x_ptr.index == SIZE_MAX) {
            src_elements = src_ptr_val->data.x_ptr.base_ptr;
            src_start = 0;
            src_end = 1;
        } else {
            ConstExprValue *array_val = src_ptr_val->data.x_ptr.base_ptr;
            src_elements = array_val->data.x_array.elements;
            src_start = src_ptr_val->data.x_ptr.index;
            src_end = array_val->data.x_array.size;
        }

        if (src_start + count > src_end) {
            ir_add_error(ira, &instruction->base, buf_sprintf("out of bounds pointer access"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        // TODO check for noalias violations - this should be generalized to work for any function

        for (size_t i = 0; i < count; i += 1) {
            dest_elements[dest_start + i] = src_elements[src_start + i];
        }

        ir_build_const_from(ira, &instruction->base, false);
        return ira->codegen->builtin_types.entry_void;
    }

    ir_build_memcpy_from(&ira->new_irb, &instruction->base, casted_dest_ptr, casted_src_ptr, casted_count);
    return ira->codegen->builtin_types.entry_void;
}

static TypeTableEntry *ir_analyze_instruction_slice(IrAnalyze *ira, IrInstructionSlice *instruction) {
    IrInstruction *ptr = instruction->ptr->other;
    if (ptr->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *start = instruction->start->other;
    if (start->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    TypeTableEntry *usize = ira->codegen->builtin_types.entry_usize;
    IrInstruction *casted_start = ir_implicit_cast(ira, start, usize);
    if (casted_start->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;

    IrInstruction *end;
    if (instruction->end) {
        end = instruction->end->other;
        if (end->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;
        end = ir_implicit_cast(ira, end, usize);
        if (end->type_entry->id == TypeTableEntryIdInvalid)
            return ira->codegen->builtin_types.entry_invalid;
    } else {
        end = nullptr;
    }

    TypeTableEntry *array_type = get_underlying_type(ptr->type_entry);

    TypeTableEntry *return_type;

    if (array_type->id == TypeTableEntryIdArray) {
        return_type = get_slice_type(ira->codegen, array_type->data.array.child_type, instruction->is_const);
    } else if (array_type->id == TypeTableEntryIdPointer) {
        return_type = get_slice_type(ira->codegen, array_type->data.pointer.child_type, instruction->is_const);
        if (!end) {
            ir_add_error(ira, &instruction->base, buf_sprintf("slice of pointer must include end value"));
            return ira->codegen->builtin_types.entry_invalid;
        }
    } else if (is_slice(array_type)) {
        return_type = get_slice_type(ira->codegen,
                array_type->data.structure.fields[slice_ptr_index].type_entry->data.pointer.child_type,
                instruction->is_const);
    } else {
        ir_add_error(ira, &instruction->base,
            buf_sprintf("slice of non-array type '%s'", buf_ptr(&ptr->type_entry->name)));
        // TODO if this is a typedecl, add error note showing the declaration of the type decl
        return ira->codegen->builtin_types.entry_invalid;
    }

    if (ptr->static_value.special == ConstValSpecialStatic &&
        casted_start->static_value.special == ConstValSpecialStatic &&
        (!end || end->static_value.special == ConstValSpecialStatic))
    {
        bool depends_on_compile_var =
            ptr->static_value.depends_on_compile_var ||
            casted_start->static_value.depends_on_compile_var ||
            (end ? end->static_value.depends_on_compile_var : false);

        ConstExprValue *base_ptr;
        size_t abs_offset;
        size_t rel_end;
        if (array_type->id == TypeTableEntryIdArray) {
            base_ptr = &ptr->static_value;
            abs_offset = 0;
            rel_end = array_type->data.array.len;
        } else if (array_type->id == TypeTableEntryIdPointer) {
            base_ptr = ptr->static_value.data.x_ptr.base_ptr;
            abs_offset = ptr->static_value.data.x_ptr.index;
            if (abs_offset == SIZE_MAX) {
                rel_end = 1;
            } else {
                rel_end = base_ptr->data.x_array.size - abs_offset;
            }
        } else if (is_slice(array_type)) {
            ConstExprValue *ptr_val = &ptr->static_value.data.x_struct.fields[slice_ptr_index];
            ConstExprValue *len_val = &ptr->static_value.data.x_struct.fields[slice_len_index];
            base_ptr = ptr_val->data.x_ptr.base_ptr;
            abs_offset = ptr_val->data.x_ptr.index;

            if (ptr_val->data.x_ptr.index == SIZE_MAX) {
                rel_end = 1;
            } else {
                rel_end = len_val->data.x_bignum.data.x_uint;
            }
        } else {
            zig_unreachable();
        }

        uint64_t start_scalar = casted_start->static_value.data.x_bignum.data.x_uint;
        if (start_scalar > rel_end) {
            ir_add_error(ira, &instruction->base, buf_sprintf("out of bounds slice"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        uint64_t end_scalar;
        if (end) {
            end_scalar = end->static_value.data.x_bignum.data.x_uint;
        } else {
            end_scalar = rel_end;
        }
        if (end_scalar > rel_end) {
            ir_add_error(ira, &instruction->base, buf_sprintf("out of bounds slice"));
            return ira->codegen->builtin_types.entry_invalid;
        }
        if (start_scalar > end_scalar) {
            ir_add_error(ira, &instruction->base, buf_sprintf("slice start is greater than end"));
            return ira->codegen->builtin_types.entry_invalid;
        }

        ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);
        out_val->data.x_struct.fields = allocate<ConstExprValue>(2);

        ConstExprValue *ptr_val = &out_val->data.x_struct.fields[slice_ptr_index];
        ptr_val->special = ConstValSpecialStatic;
        ptr_val->data.x_ptr.base_ptr = base_ptr;
        ptr_val->data.x_ptr.index = (abs_offset != SIZE_MAX) ? (abs_offset + start_scalar) : SIZE_MAX;

        ConstExprValue *len_val = &out_val->data.x_struct.fields[slice_len_index];
        len_val->special = ConstValSpecialStatic;
        bignum_init_unsigned(&len_val->data.x_bignum, rel_end);

        return return_type;
    }

    IrInstruction *new_instruction = ir_build_slice_from(&ira->new_irb, &instruction->base, ptr, casted_start, end, instruction->is_const);
    ir_add_alloca(ira, new_instruction, return_type);

    return return_type;
}

static TypeTableEntry *ir_analyze_instruction_member_count(IrAnalyze *ira, IrInstructionMemberCount *instruction) {
    IrInstruction *container = instruction->container->other;
    if (container->type_entry->id == TypeTableEntryIdInvalid)
        return ira->codegen->builtin_types.entry_invalid;
    TypeTableEntry *container_type = ir_resolve_type(ira, container);
    TypeTableEntry *canon_type = get_underlying_type(container_type);

    uint64_t result;
    if (canon_type->id == TypeTableEntryIdInvalid) {
        return ira->codegen->builtin_types.entry_invalid;
    } else if (canon_type->id == TypeTableEntryIdEnum) {
        result = canon_type->data.enumeration.src_field_count;
    } else if (canon_type->id == TypeTableEntryIdStruct) {
        result = canon_type->data.structure.src_field_count;
    } else if (canon_type->id == TypeTableEntryIdUnion) {
        result = canon_type->data.unionation.src_field_count;
    } else {
        ir_add_error(ira, &instruction->base, buf_sprintf("no value count available for type '%s'", buf_ptr(&container_type->name)));
        return ira->codegen->builtin_types.entry_invalid;
    }

    bool depends_on_compile_var = container->static_value.depends_on_compile_var;
    ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base, depends_on_compile_var);
    bignum_init_unsigned(&out_val->data.x_bignum, result);
    return ira->codegen->builtin_types.entry_num_lit_int;
}

static TypeTableEntry *ir_analyze_instruction_nocast(IrAnalyze *ira, IrInstruction *instruction) {
    switch (instruction->id) {
        case IrInstructionIdInvalid:
            zig_unreachable();
        case IrInstructionIdReturn:
            return ir_analyze_instruction_return(ira, (IrInstructionReturn *)instruction);
        case IrInstructionIdConst:
            return ir_analyze_instruction_const(ira, (IrInstructionConst *)instruction);
        case IrInstructionIdUnOp:
            return ir_analyze_instruction_un_op(ira, (IrInstructionUnOp *)instruction);
        case IrInstructionIdBinOp:
            return ir_analyze_instruction_bin_op(ira, (IrInstructionBinOp *)instruction);
        case IrInstructionIdDeclVar:
            return ir_analyze_instruction_decl_var(ira, (IrInstructionDeclVar *)instruction);
        case IrInstructionIdLoadPtr:
            return ir_analyze_instruction_load_ptr(ira, (IrInstructionLoadPtr *)instruction);
        case IrInstructionIdStorePtr:
            return ir_analyze_instruction_store_ptr(ira, (IrInstructionStorePtr *)instruction);
        case IrInstructionIdElemPtr:
            return ir_analyze_instruction_elem_ptr(ira, (IrInstructionElemPtr *)instruction);
        case IrInstructionIdVarPtr:
            return ir_analyze_instruction_var_ptr(ira, (IrInstructionVarPtr *)instruction);
        case IrInstructionIdFieldPtr:
            return ir_analyze_instruction_field_ptr(ira, (IrInstructionFieldPtr *)instruction);
        case IrInstructionIdCall:
            return ir_analyze_instruction_call(ira, (IrInstructionCall *)instruction);
        case IrInstructionIdBr:
            return ir_analyze_instruction_br(ira, (IrInstructionBr *)instruction);
        case IrInstructionIdCondBr:
            return ir_analyze_instruction_cond_br(ira, (IrInstructionCondBr *)instruction);
        case IrInstructionIdUnreachable:
            return ir_analyze_instruction_unreachable(ira, (IrInstructionUnreachable *)instruction);
        case IrInstructionIdPhi:
            return ir_analyze_instruction_phi(ira, (IrInstructionPhi *)instruction);
        case IrInstructionIdTypeOf:
            return ir_analyze_instruction_typeof(ira, (IrInstructionTypeOf *)instruction);
        case IrInstructionIdToPtrType:
            return ir_analyze_instruction_to_ptr_type(ira, (IrInstructionToPtrType *)instruction);
        case IrInstructionIdPtrTypeChild:
            return ir_analyze_instruction_ptr_type_child(ira, (IrInstructionPtrTypeChild *)instruction);
        case IrInstructionIdSetFnTest:
            return ir_analyze_instruction_set_fn_test(ira, (IrInstructionSetFnTest *)instruction);
        case IrInstructionIdSetFnVisible:
            return ir_analyze_instruction_set_fn_visible(ira, (IrInstructionSetFnVisible *)instruction);
        case IrInstructionIdSetDebugSafety:
            return ir_analyze_instruction_set_debug_safety(ira, (IrInstructionSetDebugSafety *)instruction);
        case IrInstructionIdSliceType:
            return ir_analyze_instruction_slice_type(ira, (IrInstructionSliceType *)instruction);
        case IrInstructionIdAsm:
            return ir_analyze_instruction_asm(ira, (IrInstructionAsm *)instruction);
        case IrInstructionIdArrayType:
            return ir_analyze_instruction_array_type(ira, (IrInstructionArrayType *)instruction);
        case IrInstructionIdCompileVar:
            return ir_analyze_instruction_compile_var(ira, (IrInstructionCompileVar *)instruction);
        case IrInstructionIdSizeOf:
            return ir_analyze_instruction_size_of(ira, (IrInstructionSizeOf *)instruction);
        case IrInstructionIdTestNull:
            return ir_analyze_instruction_test_null(ira, (IrInstructionTestNull *)instruction);
        case IrInstructionIdUnwrapMaybe:
            return ir_analyze_instruction_unwrap_maybe(ira, (IrInstructionUnwrapMaybe *)instruction);
        case IrInstructionIdClz:
            return ir_analyze_instruction_clz(ira, (IrInstructionClz *)instruction);
        case IrInstructionIdCtz:
            return ir_analyze_instruction_ctz(ira, (IrInstructionCtz *)instruction);
        case IrInstructionIdSwitchBr:
            return ir_analyze_instruction_switch_br(ira, (IrInstructionSwitchBr *)instruction);
        case IrInstructionIdSwitchTarget:
            return ir_analyze_instruction_switch_target(ira, (IrInstructionSwitchTarget *)instruction);
        case IrInstructionIdSwitchVar:
            return ir_analyze_instruction_switch_var(ira, (IrInstructionSwitchVar *)instruction);
        case IrInstructionIdEnumTag:
            return ir_analyze_instruction_enum_tag(ira, (IrInstructionEnumTag *)instruction);
        case IrInstructionIdStaticEval:
            return ir_analyze_instruction_static_eval(ira, (IrInstructionStaticEval *)instruction);
        case IrInstructionIdImport:
            return ir_analyze_instruction_import(ira, (IrInstructionImport *)instruction);
        case IrInstructionIdArrayLen:
            return ir_analyze_instruction_array_len(ira, (IrInstructionArrayLen *)instruction);
        case IrInstructionIdRef:
            return ir_analyze_instruction_ref(ira, (IrInstructionRef *)instruction);
        case IrInstructionIdContainerInitList:
            return ir_analyze_instruction_container_init_list(ira, (IrInstructionContainerInitList *)instruction);
        case IrInstructionIdContainerInitFields:
            return ir_analyze_instruction_container_init_fields(ira, (IrInstructionContainerInitFields *)instruction);
        case IrInstructionIdMinValue:
            return ir_analyze_instruction_min_value(ira, (IrInstructionMinValue *)instruction);
        case IrInstructionIdMaxValue:
            return ir_analyze_instruction_max_value(ira, (IrInstructionMaxValue *)instruction);
        case IrInstructionIdCompileErr:
            return ir_analyze_instruction_compile_err(ira, (IrInstructionCompileErr *)instruction);
        case IrInstructionIdErrName:
            return ir_analyze_instruction_err_name(ira, (IrInstructionErrName *)instruction);
        case IrInstructionIdCImport:
            return ir_analyze_instruction_c_import(ira, (IrInstructionCImport *)instruction);
        case IrInstructionIdCInclude:
            return ir_analyze_instruction_c_include(ira, (IrInstructionCInclude *)instruction);
        case IrInstructionIdCDefine:
            return ir_analyze_instruction_c_define(ira, (IrInstructionCDefine *)instruction);
        case IrInstructionIdCUndef:
            return ir_analyze_instruction_c_undef(ira, (IrInstructionCUndef *)instruction);
        case IrInstructionIdEmbedFile:
            return ir_analyze_instruction_embed_file(ira, (IrInstructionEmbedFile *)instruction);
        case IrInstructionIdCmpxchg:
            return ir_analyze_instruction_cmpxchg(ira, (IrInstructionCmpxchg *)instruction);
        case IrInstructionIdFence:
            return ir_analyze_instruction_fence(ira, (IrInstructionFence *)instruction);
        case IrInstructionIdDivExact:
            return ir_analyze_instruction_div_exact(ira, (IrInstructionDivExact *)instruction);
        case IrInstructionIdTruncate:
            return ir_analyze_instruction_truncate(ira, (IrInstructionTruncate *)instruction);
        case IrInstructionIdIntType:
            return ir_analyze_instruction_int_type(ira, (IrInstructionIntType *)instruction);
        case IrInstructionIdBoolNot:
            return ir_analyze_instruction_bool_not(ira, (IrInstructionBoolNot *)instruction);
        case IrInstructionIdAlloca:
            return ir_analyze_instruction_alloca(ira, (IrInstructionAlloca *)instruction);
        case IrInstructionIdMemset:
            return ir_analyze_instruction_memset(ira, (IrInstructionMemset *)instruction);
        case IrInstructionIdMemcpy:
            return ir_analyze_instruction_memcpy(ira, (IrInstructionMemcpy *)instruction);
        case IrInstructionIdSlice:
            return ir_analyze_instruction_slice(ira, (IrInstructionSlice *)instruction);
        case IrInstructionIdMemberCount:
            return ir_analyze_instruction_member_count(ira, (IrInstructionMemberCount *)instruction);
        case IrInstructionIdCast:
        case IrInstructionIdStructFieldPtr:
        case IrInstructionIdEnumFieldPtr:
        case IrInstructionIdStructInit:
            zig_panic("TODO analyze more instructions");
    }
    zig_unreachable();
}

static TypeTableEntry *ir_analyze_instruction(IrAnalyze *ira, IrInstruction *instruction) {
    TypeTableEntry *instruction_type = ir_analyze_instruction_nocast(ira, instruction);
    instruction->type_entry = instruction_type;
    if (instruction->other) {
        instruction->other->type_entry = instruction_type;
    } else {
        assert(instruction_type->id == TypeTableEntryIdInvalid ||
               instruction_type->id == TypeTableEntryIdUnreachable);
        instruction->other = instruction;
    }
    return instruction_type;
}

// This function attempts to evaluate IR code while doing type checking and other analysis.
// It emits a new IrExecutable which is partially evaluated IR code.
TypeTableEntry *ir_analyze(CodeGen *codegen, IrExecutable *old_exec, IrExecutable *new_exec,
        TypeTableEntry *expected_type, AstNode *expected_type_source_node)
{
    assert(!old_exec->invalid);

    IrAnalyze ir_analyze_data = {};
    IrAnalyze *ira = &ir_analyze_data;
    ira->codegen = codegen;
    ira->explicit_return_type = expected_type;

    ira->old_irb.codegen = codegen;
    ira->old_irb.exec = old_exec;

    ira->new_irb.codegen = codegen;
    ira->new_irb.exec = new_exec;

    ira->exec_context.mem_slot_count = ira->old_irb.exec->mem_slot_count;
    ira->exec_context.mem_slot_list = allocate<ConstExprValue>(ira->exec_context.mem_slot_count);

    IrBasicBlock *old_entry_bb = ira->old_irb.exec->basic_block_list.at(0);
    IrBasicBlock *new_entry_bb = ir_get_new_bb(ira, old_entry_bb);
    ir_ref_bb(new_entry_bb);
    ira->new_irb.current_basic_block = new_entry_bb;
    ira->block_queue_index = 0;

    ir_start_bb(ira, old_entry_bb, nullptr);

    while (ira->block_queue_index < ira->old_bb_queue.length) {
        IrInstruction *old_instruction = ira->old_irb.current_basic_block->instruction_list.at(ira->instruction_index);

        if (old_instruction->ref_count == 0 && !ir_has_side_effects(old_instruction)) {
            ira->instruction_index += 1;
            continue;
        }

        TypeTableEntry *return_type = ir_analyze_instruction(ira, old_instruction);

        // unreachable instructions do their own control flow.
        if (return_type->id == TypeTableEntryIdUnreachable)
            continue;

        ira->instruction_index += 1;
    }

    if (new_exec->invalid) {
        return ira->codegen->builtin_types.entry_invalid;
    } else if (ira->implicit_return_type_list.length == 0) {
        return codegen->builtin_types.entry_unreachable;
    } else {
        return ir_resolve_peer_types(ira, expected_type_source_node, ira->implicit_return_type_list.items,
                ira->implicit_return_type_list.length);
    }
}

bool ir_has_side_effects(IrInstruction *instruction) {
    switch (instruction->id) {
        case IrInstructionIdInvalid:
            zig_unreachable();
        case IrInstructionIdBr:
        case IrInstructionIdCondBr:
        case IrInstructionIdSwitchBr:
        case IrInstructionIdDeclVar:
        case IrInstructionIdStorePtr:
        case IrInstructionIdCall:
        case IrInstructionIdReturn:
        case IrInstructionIdUnreachable:
        case IrInstructionIdSetFnTest:
        case IrInstructionIdSetFnVisible:
        case IrInstructionIdSetDebugSafety:
        case IrInstructionIdImport:
        case IrInstructionIdCompileErr:
        case IrInstructionIdCImport:
        case IrInstructionIdCInclude:
        case IrInstructionIdCDefine:
        case IrInstructionIdCUndef:
        case IrInstructionIdCmpxchg:
        case IrInstructionIdFence:
        case IrInstructionIdMemset:
        case IrInstructionIdMemcpy:
            return true;
        case IrInstructionIdPhi:
        case IrInstructionIdUnOp:
        case IrInstructionIdBinOp:
        case IrInstructionIdLoadPtr:
        case IrInstructionIdConst:
        case IrInstructionIdCast:
        case IrInstructionIdContainerInitList:
        case IrInstructionIdContainerInitFields:
        case IrInstructionIdStructInit:
        case IrInstructionIdFieldPtr:
        case IrInstructionIdElemPtr:
        case IrInstructionIdVarPtr:
        case IrInstructionIdTypeOf:
        case IrInstructionIdToPtrType:
        case IrInstructionIdPtrTypeChild:
        case IrInstructionIdArrayLen:
        case IrInstructionIdStructFieldPtr:
        case IrInstructionIdEnumFieldPtr:
        case IrInstructionIdArrayType:
        case IrInstructionIdSliceType:
        case IrInstructionIdCompileVar:
        case IrInstructionIdSizeOf:
        case IrInstructionIdTestNull:
        case IrInstructionIdUnwrapMaybe:
        case IrInstructionIdClz:
        case IrInstructionIdCtz:
        case IrInstructionIdSwitchVar:
        case IrInstructionIdSwitchTarget:
        case IrInstructionIdEnumTag:
        case IrInstructionIdStaticEval:
        case IrInstructionIdRef:
        case IrInstructionIdMinValue:
        case IrInstructionIdMaxValue:
        case IrInstructionIdErrName:
        case IrInstructionIdEmbedFile:
        case IrInstructionIdDivExact:
        case IrInstructionIdTruncate:
        case IrInstructionIdIntType:
        case IrInstructionIdBoolNot:
        case IrInstructionIdAlloca:
        case IrInstructionIdSlice:
        case IrInstructionIdMemberCount:
            return false;
        case IrInstructionIdAsm:
            {
                IrInstructionAsm *asm_instruction = (IrInstructionAsm *)instruction;
                return asm_instruction->has_side_effects;
            }
    }
    zig_unreachable();
}

// TODO port over all this commented out code into new IR way of doing things
//static TypeTableEntry *analyze_builtin_fn_call_expr(CodeGen *g, ImportTableEntry *import, BlockContext *context,
//        TypeTableEntry *expected_type, AstNode *node)
//{
//
//    switch (builtin_fn->id) {
//        case BuiltinFnIdInvalid:
//            zig_unreachable();
//        case BuiltinFnIdAddWithOverflow:
//        case BuiltinFnIdSubWithOverflow:
//        case BuiltinFnIdMulWithOverflow:
//        case BuiltinFnIdShlWithOverflow:
//            {
//                AstNode *type_node = node->data.fn_call_expr.params.at(0);
//                TypeTableEntry *int_type = analyze_type_expr(g, import, context, type_node);
//                if (int_type->id == TypeTableEntryIdInvalid) {
//                    return g->builtin_types.entry_bool;
//                } else if (int_type->id == TypeTableEntryIdInt) {
//                    AstNode *op1_node = node->data.fn_call_expr.params.at(1);
//                    AstNode *op2_node = node->data.fn_call_expr.params.at(2);
//                    AstNode *result_node = node->data.fn_call_expr.params.at(3);
//
//                    analyze_expression(g, import, context, int_type, op1_node);
//                    analyze_expression(g, import, context, int_type, op2_node);
//                    analyze_expression(g, import, context, get_pointer_to_type(g, int_type, false),
//                            result_node);
//                } else {
//                    add_node_error(g, type_node,
//                        buf_sprintf("expected integer type, found '%s'", buf_ptr(&int_type->name)));
//                }
//
//                // TODO constant expression evaluation
//
//                return g->builtin_types.entry_bool;
//            }
//        case BuiltinFnIdAlignof:
//            {
//                AstNode *type_node = node->data.fn_call_expr.params.at(0);
//                TypeTableEntry *type_entry = analyze_type_expr(g, import, context, type_node);
//                if (type_entry->id == TypeTableEntryIdInvalid) {
//                    return g->builtin_types.entry_invalid;
//                } else if (type_entry->id == TypeTableEntryIdUnreachable) {
//                    add_node_error(g, first_executing_node(type_node),
//                            buf_sprintf("no align available for type '%s'", buf_ptr(&type_entry->name)));
//                    return g->builtin_types.entry_invalid;
//                } else {
//                    uint64_t align_in_bytes = LLVMABISizeOfType(g->target_data_ref, type_entry->type_ref);
//                    return resolve_expr_const_val_as_unsigned_num_lit(g, node, expected_type,
//                            align_in_bytes, false);
//                }
//            }
//        case BuiltinFnIdBreakpoint:
//            mark_impure_fn(g, context, node);
//            return g->builtin_types.entry_void;
//        case BuiltinFnIdReturnAddress:
//        case BuiltinFnIdFrameAddress:
//            mark_impure_fn(g, context, node);
//            return builtin_fn->return_type;
//    }
//    zig_unreachable();
//}

//static TypeTableEntry *analyze_return_expr(CodeGen *g, ImportTableEntry *import, BlockContext *context,
//        TypeTableEntry *expected_type, AstNode *node)
//{
//    if (!node->data.return_expr.expr) {
//        node->data.return_expr.expr = create_ast_void_node(g, import, node);
//        normalize_parent_ptrs(node);
//    }
//
//    TypeTableEntry *expected_return_type = get_return_type(context);
//
//    switch (node->data.return_expr.kind) {
//        case ReturnKindUnconditional:
//            zig_panic("TODO moved to ir.cpp");
//        case ReturnKindError:
//            {
//                TypeTableEntry *expected_err_type;
//                if (expected_type) {
//                    expected_err_type = get_error_type(g, expected_type);
//                } else {
//                    expected_err_type = nullptr;
//                }
//                TypeTableEntry *resolved_type = analyze_expression(g, import, context, expected_err_type,
//                        node->data.return_expr.expr);
//                if (resolved_type->id == TypeTableEntryIdInvalid) {
//                    return resolved_type;
//                } else if (resolved_type->id == TypeTableEntryIdErrorUnion) {
//                    if (expected_return_type->id != TypeTableEntryIdErrorUnion &&
//                        expected_return_type->id != TypeTableEntryIdPureError)
//                    {
//                        ErrorMsg *msg = add_node_error(g, node,
//                            buf_sprintf("%%return statement in function with return type '%s'",
//                                buf_ptr(&expected_return_type->name)));
//                        AstNode *return_type_node = context->fn_entry->fn_def_node->data.fn_def.fn_proto->data.fn_proto.return_type;
//                        add_error_note(g, msg, return_type_node, buf_sprintf("function return type here"));
//                    }
//
//                    return resolved_type->data.error.child_type;
//                } else {
//                    add_node_error(g, node->data.return_expr.expr,
//                        buf_sprintf("expected error type, found '%s'", buf_ptr(&resolved_type->name)));
//                    return g->builtin_types.entry_invalid;
//                }
//            }
//        case ReturnKindMaybe:
//            {
//                TypeTableEntry *expected_maybe_type;
//                if (expected_type) {
//                    expected_maybe_type = get_maybe_type(g, expected_type);
//                } else {
//                    expected_maybe_type = nullptr;
//                }
//                TypeTableEntry *resolved_type = analyze_expression(g, import, context, expected_maybe_type,
//                        node->data.return_expr.expr);
//                if (resolved_type->id == TypeTableEntryIdInvalid) {
//                    return resolved_type;
//                } else if (resolved_type->id == TypeTableEntryIdMaybe) {
//                    if (expected_return_type->id != TypeTableEntryIdMaybe) {
//                        ErrorMsg *msg = add_node_error(g, node,
//                            buf_sprintf("?return statement in function with return type '%s'",
//                                buf_ptr(&expected_return_type->name)));
//                        AstNode *return_type_node = context->fn_entry->fn_def_node->data.fn_def.fn_proto->data.fn_proto.return_type;
//                        add_error_note(g, msg, return_type_node, buf_sprintf("function return type here"));
//                    }
//
//                    return resolved_type->data.maybe.child_type;
//                } else {
//                    add_node_error(g, node->data.return_expr.expr,
//                        buf_sprintf("expected maybe type, found '%s'", buf_ptr(&resolved_type->name)));
//                    return g->builtin_types.entry_invalid;
//                }
//            }
//    }
//    zig_unreachable();
//}
//static TypeTableEntry *analyze_array_access_expr(CodeGen *g, ImportTableEntry *import, BlockContext *context,
//        AstNode *node, LValPurpose purpose)
//{
//    TypeTableEntry *array_type = analyze_expression(g, import, context, nullptr,
//            node->data.array_access_expr.array_ref_expr);
//
//    TypeTableEntry *return_type;
//
//    if (array_type->id == TypeTableEntryIdInvalid) {
//        return_type = g->builtin_types.entry_invalid;
//    } else if (array_type->id == TypeTableEntryIdArray) {
//        if (array_type->data.array.len == 0) {
//            add_node_error(g, node, buf_sprintf("out of bounds array access"));
//        }
//        return_type = array_type->data.array.child_type;
//    } else if (array_type->id == TypeTableEntryIdPointer) {
//        if (array_type->data.pointer.is_const && purpose == LValPurposeAssign) {
//            add_node_error(g, node, buf_sprintf("cannot assign to constant"));
//            return g->builtin_types.entry_invalid;
//        }
//        return_type = array_type->data.pointer.child_type;
//    } else if (array_type->id == TypeTableEntryIdStruct &&
//               array_type->data.structure.is_slice)
//    {
//        TypeTableEntry *pointer_type = array_type->data.structure.fields[0].type_entry;
//        if (pointer_type->data.pointer.is_const && purpose == LValPurposeAssign) {
//            add_node_error(g, node, buf_sprintf("cannot assign to constant"));
//            return g->builtin_types.entry_invalid;
//        }
//        return_type = pointer_type->data.pointer.child_type;
//    } else {
//        add_node_error(g, node,
//                buf_sprintf("array access of non-array type '%s'", buf_ptr(&array_type->name)));
//        return_type = g->builtin_types.entry_invalid;
//    }
//
//    analyze_expression(g, import, context, g->builtin_types.entry_usize, node->data.array_access_expr.subscript);
//
//    return return_type;
//}
//
//static TypeTableEntry *analyze_unwrap_error_expr(CodeGen *g, ImportTableEntry *import,
//        BlockContext *parent_context, TypeTableEntry *expected_type, AstNode *node)
//{
//    AstNode *op1 = node->data.unwrap_err_expr.op1;
//    AstNode *op2 = node->data.unwrap_err_expr.op2;
//    AstNode *var_node = node->data.unwrap_err_expr.symbol;
//
//    TypeTableEntry *lhs_type = analyze_expression(g, import, parent_context, nullptr, op1);
//    if (lhs_type->id == TypeTableEntryIdInvalid) {
//        return lhs_type;
//    } else if (lhs_type->id == TypeTableEntryIdErrorUnion) {
//        TypeTableEntry *child_type = lhs_type->data.error.child_type;
//        BlockContext *child_context;
//        if (var_node) {
//            child_context = new_block_context(node, parent_context);
//            var_node->block_context = child_context;
//            Buf *var_name = var_node->data.symbol_expr.symbol;
//            node->data.unwrap_err_expr.var = add_local_var(g, var_node, import, child_context, var_name,
//                    g->builtin_types.entry_pure_error, true, nullptr);
//        } else {
//            child_context = parent_context;
//        }
//
//        analyze_expression(g, import, child_context, child_type, op2);
//        return child_type;
//    } else {
//        add_node_error(g, op1,
//            buf_sprintf("expected error type, found '%s'", buf_ptr(&lhs_type->name)));
//        return g->builtin_types.entry_invalid;
//    }
//}
//
//static void validate_voided_expr(CodeGen *g, AstNode *source_node, TypeTableEntry *type_entry) {
//    if (type_entry->id == TypeTableEntryIdMetaType) {
//        add_node_error(g, first_executing_node(source_node), buf_sprintf("expected expression, found type"));
//    } else if (type_entry->id == TypeTableEntryIdErrorUnion) {
//        add_node_error(g, first_executing_node(source_node), buf_sprintf("statement ignores error value"));
//    }
//}
//
//static LLVMValueRef gen_shl_with_overflow(CodeGen *g, AstNode *node) {
//    assert(node->type == NodeTypeFnCallExpr);
//
//    size_t fn_call_param_count = node->data.fn_call_expr.params.length;
//    assert(fn_call_param_count == 4);
//
//    TypeTableEntry *int_type = get_type_for_type_node(node->data.fn_call_expr.params.at(0));
//    assert(int_type->id == TypeTableEntryIdInt);
//
//    LLVMValueRef val1 = gen_expr(g, node->data.fn_call_expr.params.at(1));
//    LLVMValueRef val2 = gen_expr(g, node->data.fn_call_expr.params.at(2));
//    LLVMValueRef ptr_result = gen_expr(g, node->data.fn_call_expr.params.at(3));
//
//    LLVMValueRef result = LLVMBuildShl(g->builder, val1, val2, "");
//    LLVMValueRef orig_val;
//    if (int_type->data.integral.is_signed) {
//        orig_val = LLVMBuildAShr(g->builder, result, val2, "");
//    } else {
//        orig_val = LLVMBuildLShr(g->builder, result, val2, "");
//    }
//    LLVMValueRef overflow_bit = LLVMBuildICmp(g->builder, LLVMIntNE, val1, orig_val, "");
//
//    LLVMBuildStore(g->builder, result, ptr_result);
//
//    return overflow_bit;
//}
//
//static LLVMValueRef gen_builtin_fn_call_expr(CodeGen *g, AstNode *node) {
//    assert(node->type == NodeTypeFnCallExpr);
//    AstNode *fn_ref_expr = node->data.fn_call_expr.fn_ref_expr;
//    assert(fn_ref_expr->type == NodeTypeSymbol);
//    BuiltinFnEntry *builtin_fn = node->data.fn_call_expr.builtin_fn;
//
//    switch (builtin_fn->id) {
//        case BuiltinFnIdInvalid:
//        case BuiltinFnIdTypeof:
//            zig_unreachable();
//        case BuiltinFnIdAddWithOverflow:
//        case BuiltinFnIdSubWithOverflow:
//        case BuiltinFnIdMulWithOverflow:
//            {
//                size_t fn_call_param_count = node->data.fn_call_expr.params.length;
//                assert(fn_call_param_count == 4);
//
//                TypeTableEntry *int_type = get_type_for_type_node(node->data.fn_call_expr.params.at(0));
//                AddSubMul add_sub_mul;
//                if (builtin_fn->id == BuiltinFnIdAddWithOverflow) {
//                    add_sub_mul = AddSubMulAdd;
//                } else if (builtin_fn->id == BuiltinFnIdSubWithOverflow) {
//                    add_sub_mul = AddSubMulSub;
//                } else if (builtin_fn->id == BuiltinFnIdMulWithOverflow) {
//                    add_sub_mul = AddSubMulMul;
//                } else {
//                    zig_unreachable();
//                }
//                LLVMValueRef fn_val = get_int_overflow_fn(g, int_type, add_sub_mul);
//
//                LLVMValueRef op1 = gen_expr(g, node->data.fn_call_expr.params.at(1));
//                LLVMValueRef op2 = gen_expr(g, node->data.fn_call_expr.params.at(2));
//                LLVMValueRef ptr_result = gen_expr(g, node->data.fn_call_expr.params.at(3));
//
//                LLVMValueRef params[] = {
//                    op1,
//                    op2,
//                };
//
//                LLVMValueRef result_struct = LLVMBuildCall(g->builder, fn_val, params, 2, "");
//                LLVMValueRef result = LLVMBuildExtractValue(g->builder, result_struct, 0, "");
//                LLVMValueRef overflow_bit = LLVMBuildExtractValue(g->builder, result_struct, 1, "");
//                LLVMBuildStore(g->builder, result, ptr_result);
//
//                return overflow_bit;
//            }
//        case BuiltinFnIdShlWithOverflow:
//            return gen_shl_with_overflow(g, node);
//        case BuiltinFnIdAlignof:
//        case BuiltinFnIdMinValue:
//        case BuiltinFnIdMaxValue:
//            // caught by constant expression eval codegen
//            zig_unreachable();
//        case BuiltinFnIdCompileVar:
//            return nullptr;
//        case BuiltinFnIdBreakpoint:
//            return LLVMBuildCall(g->builder, g->trap_fn_val, nullptr, 0, "");
//        case BuiltinFnIdFrameAddress:
//        case BuiltinFnIdReturnAddress:
//            {
//                LLVMValueRef zero = LLVMConstNull(g->builtin_types.entry_i32->type_ref);
//                return LLVMBuildCall(g->builder, builtin_fn->fn_val, &zero, 1, "");
//            }
//        case BuiltinFnIdCmpExchange:
//            return gen_cmp_exchange(g, node);
//        case BuiltinFnIdFence:
//            return gen_fence(g, node);
//        case BuiltinFnIdUnreachable:
//            zig_panic("moved to ir render");
//        case BuiltinFnIdSetFnTest:
//        case BuiltinFnIdSetFnStaticEval:
//        case BuiltinFnIdSetFnNoInline:
//        case BuiltinFnIdSetDebugSafety:
//            // do nothing
//            return nullptr;
//    }
//    zig_unreachable();
//}
//
//static LLVMValueRef gen_enum_value_expr(CodeGen *g, AstNode *node, TypeTableEntry *enum_type,
//        AstNode *arg_node)
//{
//    assert(node->type == NodeTypeFieldAccessExpr);
//
//    uint64_t value = node->data.field_access_expr.type_enum_field->value;
//    LLVMTypeRef tag_type_ref = enum_type->data.enumeration.tag_type->type_ref;
//    LLVMValueRef tag_value = LLVMConstInt(tag_type_ref, value, false);
//
//    if (enum_type->data.enumeration.gen_field_count == 0) {
//        return tag_value;
//    } else {
//        TypeTableEntry *arg_node_type = nullptr;
//        LLVMValueRef new_union_val = gen_expr(g, arg_node);
//        if (arg_node) {
//            arg_node_type = get_expr_type(arg_node);
//        } else {
//            arg_node_type = g->builtin_types.entry_void;
//        }
//
//        LLVMValueRef tmp_struct_ptr = node->data.field_access_expr.resolved_struct_val_expr.ptr;
//
//        // populate the new tag value
//        LLVMValueRef tag_field_ptr = LLVMBuildStructGEP(g->builder, tmp_struct_ptr, 0, "");
//        LLVMBuildStore(g->builder, tag_value, tag_field_ptr);
//
//        if (arg_node_type->id != TypeTableEntryIdVoid) {
//            // populate the union value
//            TypeTableEntry *union_val_type = get_expr_type(arg_node);
//            LLVMValueRef union_field_ptr = LLVMBuildStructGEP(g->builder, tmp_struct_ptr, 1, "");
//            LLVMValueRef bitcasted_union_field_ptr = LLVMBuildBitCast(g->builder, union_field_ptr,
//                    LLVMPointerType(union_val_type->type_ref, 0), "");
//
//            gen_assign_raw(g, arg_node, BinOpTypeAssign, bitcasted_union_field_ptr, new_union_val,
//                    union_val_type, union_val_type);
//
//        }
//
//        return tmp_struct_ptr;
//    }
//}
//
//static LLVMValueRef gen_array_ptr(CodeGen *g, AstNode *node) {
//    assert(node->type == NodeTypeArrayAccessExpr);
//
//    AstNode *array_expr_node = node->data.array_access_expr.array_ref_expr;
//    TypeTableEntry *array_type = get_expr_type(array_expr_node);
//
//    LLVMValueRef array_ptr = gen_array_base_ptr(g, array_expr_node);
//
//    LLVMValueRef subscript_value = gen_expr(g, node->data.array_access_expr.subscript);
//    return gen_array_elem_ptr(g, node, array_ptr, array_type, subscript_value);
//}
//
//static LLVMValueRef gen_unwrap_err_expr(CodeGen *g, AstNode *node) {
//    assert(node->type == NodeTypeUnwrapErrorExpr);
//
//    AstNode *op1 = node->data.unwrap_err_expr.op1;
//    AstNode *op2 = node->data.unwrap_err_expr.op2;
//    VariableTableEntry *var = node->data.unwrap_err_expr.var;
//
//    LLVMValueRef expr_val = gen_expr(g, op1);
//    TypeTableEntry *expr_type = get_expr_type(op1);
//    TypeTableEntry *op2_type = get_expr_type(op2);
//    assert(expr_type->id == TypeTableEntryIdErrorUnion);
//    TypeTableEntry *child_type = expr_type->data.error.child_type;
//    LLVMValueRef err_val;
//    if (handle_is_ptr(expr_type)) {
//        LLVMValueRef err_val_ptr = LLVMBuildStructGEP(g->builder, expr_val, 0, "");
//        err_val = LLVMBuildLoad(g->builder, err_val_ptr, "");
//    } else {
//        err_val = expr_val;
//    }
//    LLVMValueRef zero = LLVMConstNull(g->err_tag_type->type_ref);
//    LLVMValueRef cond_val = LLVMBuildICmp(g->builder, LLVMIntEQ, err_val, zero, "");
//
//    LLVMBasicBlockRef ok_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "UnwrapErrOk");
//    LLVMBasicBlockRef err_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "UnwrapErrError");
//    LLVMBasicBlockRef end_block;
//    bool err_reachable = op2_type->id != TypeTableEntryIdUnreachable;
//    bool have_end_block = err_reachable && type_has_bits(child_type);
//    if (have_end_block) {
//        end_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "UnwrapErrEnd");
//    }
//
//    LLVMBuildCondBr(g->builder, cond_val, ok_block, err_block);
//
//    LLVMPositionBuilderAtEnd(g->builder, err_block);
//    if (var) {
//        LLVMBuildStore(g->builder, err_val, var->value_ref);
//    }
//    LLVMValueRef err_result = gen_expr(g, op2);
//    if (have_end_block) {
//        LLVMBuildBr(g->builder, end_block);
//    } else if (err_reachable) {
//        LLVMBuildBr(g->builder, ok_block);
//    }
//
//    LLVMPositionBuilderAtEnd(g->builder, ok_block);
//    if (!type_has_bits(child_type)) {
//        return nullptr;
//    }
//    LLVMValueRef child_val_ptr = LLVMBuildStructGEP(g->builder, expr_val, 1, "");
//    LLVMValueRef child_val = get_handle_value(g, child_val_ptr, child_type);
//
//    if (!have_end_block) {
//        return child_val;
//    }
//
//    LLVMBuildBr(g->builder, end_block);
//
//    LLVMPositionBuilderAtEnd(g->builder, end_block);
//    LLVMValueRef phi = LLVMBuildPhi(g->builder, LLVMTypeOf(err_result), "");
//    LLVMValueRef incoming_values[2] = {child_val, err_result};
//    LLVMBasicBlockRef incoming_blocks[2] = {ok_block, err_block};
//    LLVMAddIncoming(phi, incoming_values, incoming_blocks, 2);
//    return phi;
//}
//
//static LLVMValueRef gen_return_expr(CodeGen *g, AstNode *node) {
//    assert(node->type == NodeTypeReturnExpr);
//    AstNode *param_node = node->data.return_expr.expr;
//    assert(param_node);
//    LLVMValueRef value = gen_expr(g, param_node);
//    TypeTableEntry *value_type = get_expr_type(param_node);
//
//    switch (node->data.return_expr.kind) {
//        case ReturnKindUnconditional:
//            {
//                Expr *expr = get_resolved_expr(param_node);
//                if (expr->const_val.ok) {
//                    if (value_type->id == TypeTableEntryIdErrorUnion) {
//                        if (expr->const_val.data.x_err.err) {
//                            expr->return_knowledge = ReturnKnowledgeKnownError;
//                        } else {
//                            expr->return_knowledge = ReturnKnowledgeKnownNonError;
//                        }
//                    } else if (value_type->id == TypeTableEntryIdMaybe) {
//                        if (expr->const_val.data.x_maybe) {
//                            expr->return_knowledge = ReturnKnowledgeKnownNonNull;
//                        } else {
//                            expr->return_knowledge = ReturnKnowledgeKnownNull;
//                        }
//                    }
//                }
//                return gen_return(g, node, value, expr->return_knowledge);
//            }
//        case ReturnKindError:
//            {
//                assert(value_type->id == TypeTableEntryIdErrorUnion);
//                TypeTableEntry *child_type = value_type->data.error.child_type;
//
//                LLVMBasicBlockRef return_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "ErrRetReturn");
//                LLVMBasicBlockRef continue_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "ErrRetContinue");
//
//                LLVMValueRef err_val;
//                if (type_has_bits(child_type)) {
//                    LLVMValueRef err_val_ptr = LLVMBuildStructGEP(g->builder, value, 0, "");
//                    err_val = LLVMBuildLoad(g->builder, err_val_ptr, "");
//                } else {
//                    err_val = value;
//                }
//                LLVMValueRef zero = LLVMConstNull(g->err_tag_type->type_ref);
//                LLVMValueRef cond_val = LLVMBuildICmp(g->builder, LLVMIntEQ, err_val, zero, "");
//                LLVMBuildCondBr(g->builder, cond_val, continue_block, return_block);
//
//                LLVMPositionBuilderAtEnd(g->builder, return_block);
//                TypeTableEntry *return_type = g->cur_fn->type_entry->data.fn.fn_type_id.return_type;
//                if (return_type->id == TypeTableEntryIdPureError) {
//                    gen_return(g, node, err_val, ReturnKnowledgeKnownError);
//                } else if (return_type->id == TypeTableEntryIdErrorUnion) {
//                    if (type_has_bits(return_type->data.error.child_type)) {
//                        assert(g->cur_ret_ptr);
//
//                        LLVMValueRef tag_ptr = LLVMBuildStructGEP(g->builder, g->cur_ret_ptr, 0, "");
//                        LLVMBuildStore(g->builder, err_val, tag_ptr);
//                        LLVMBuildRetVoid(g->builder);
//                    } else {
//                        gen_return(g, node, err_val, ReturnKnowledgeKnownError);
//                    }
//                } else {
//                    zig_unreachable();
//                }
//
//                LLVMPositionBuilderAtEnd(g->builder, continue_block);
//                if (type_has_bits(child_type)) {
//                    LLVMValueRef val_ptr = LLVMBuildStructGEP(g->builder, value, 1, "");
//                    return get_handle_value(g, val_ptr, child_type);
//                } else {
//                    return nullptr;
//                }
//            }
//        case ReturnKindMaybe:
//            {
//                assert(value_type->id == TypeTableEntryIdMaybe);
//                TypeTableEntry *child_type = value_type->data.maybe.child_type;
//
//                LLVMBasicBlockRef return_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "MaybeRetReturn");
//                LLVMBasicBlockRef continue_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "MaybeRetContinue");
//
//                LLVMValueRef maybe_val_ptr = LLVMBuildStructGEP(g->builder, value, 1, "");
//                LLVMValueRef is_non_null = LLVMBuildLoad(g->builder, maybe_val_ptr, "");
//
//                LLVMValueRef zero = LLVMConstNull(LLVMInt1Type());
//                LLVMValueRef cond_val = LLVMBuildICmp(g->builder, LLVMIntNE, is_non_null, zero, "");
//                LLVMBuildCondBr(g->builder, cond_val, continue_block, return_block);
//
//                LLVMPositionBuilderAtEnd(g->builder, return_block);
//                TypeTableEntry *return_type = g->cur_fn->type_entry->data.fn.fn_type_id.return_type;
//                assert(return_type->id == TypeTableEntryIdMaybe);
//                if (handle_is_ptr(return_type)) {
//                    assert(g->cur_ret_ptr);
//
//                    LLVMValueRef maybe_bit_ptr = LLVMBuildStructGEP(g->builder, g->cur_ret_ptr, 1, "");
//                    LLVMBuildStore(g->builder, zero, maybe_bit_ptr);
//                    LLVMBuildRetVoid(g->builder);
//                } else {
//                    LLVMValueRef ret_zero_value = LLVMConstNull(return_type->type_ref);
//                    gen_return(g, node, ret_zero_value, ReturnKnowledgeKnownNull);
//                }
//
//                LLVMPositionBuilderAtEnd(g->builder, continue_block);
//                if (type_has_bits(child_type)) {
//                    LLVMValueRef val_ptr = LLVMBuildStructGEP(g->builder, value, 0, "");
//                    return get_handle_value(g, val_ptr, child_type);
//                } else {
//                    return nullptr;
//                }
//            }
//    }
//    zig_unreachable();
//}