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Fix generation of tail fields for packed struct

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This commit is contained in:
LemonBoy 2019-09-20 09:37:13 +02:00
parent 74d0b5bf7c
commit 75ec7e4e00
4 changed files with 50 additions and 9 deletions
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13
src/analyze.cpp
View File

@ -7633,6 +7633,11 @@ static void resolve_llvm_types_slice(CodeGen *g, ZigType *type, ResolveStatus wa
type->data.structure.resolve_status = ResolveStatusLLVMFull;
}
static LLVMTypeRef get_llvm_array_type(unsigned byte_size) {
return byte_size == 1 ?
LLVMInt8Type() : LLVMArrayType(LLVMInt8Type(), byte_size);
}
static void resolve_llvm_types_struct(CodeGen *g, ZigType *struct_type, ResolveStatus wanted_resolve_status,
ZigType *async_frame_type)
{
@ -7730,9 +7735,8 @@ static void resolve_llvm_types_struct(CodeGen *g, ZigType *struct_type, ResolveS
size_t full_abi_size = get_abi_size_bytes(full_bit_count, g->pointer_size_bytes);
if (full_abi_size * 8 == full_bit_count) {
// next field recovers ABI alignment
element_types[gen_field_index] = LLVMIntType((unsigned)(full_bit_count));
element_types[gen_field_index] = get_llvm_array_type(full_abi_size);
gen_field_index += 1;
first_packed_bits_offset_misalign = SIZE_MAX;
}
} else if (get_abi_size_bytes(field_type->size_in_bits, g->pointer_size_bytes) * 8 != field_size_in_bits) {
@ -7740,6 +7744,8 @@ static void resolve_llvm_types_struct(CodeGen *g, ZigType *struct_type, ResolveS
} else {
// This is a byte-aligned field (both start and end) in a packed struct.
element_types[gen_field_index] = get_llvm_type(g, field_type);
assert(get_abi_size_bytes(field_type->size_in_bits, g->pointer_size_bytes) ==
LLVMStoreSizeOfType(g->target_data_ref, element_types[gen_field_index]));
gen_field_index += 1;
}
packed_bits_offset = next_packed_bits_offset;
@ -7802,11 +7808,12 @@ static void resolve_llvm_types_struct(CodeGen *g, ZigType *struct_type, ResolveS
if (first_packed_bits_offset_misalign != SIZE_MAX) {
size_t full_bit_count = packed_bits_offset - first_packed_bits_offset_misalign;
size_t full_abi_size = get_abi_size_bytes(full_bit_count, g->pointer_size_bytes);
element_types[gen_field_index] = LLVMIntType((unsigned)full_abi_size * 8);
element_types[gen_field_index] = get_llvm_array_type(full_abi_size);
gen_field_index += 1;
}
if (type_has_bits(struct_type)) {
assert(struct_type->data.structure.gen_field_count == gen_field_index);
LLVMStructSetBody(struct_type->llvm_type, element_types,
(unsigned)struct_type->data.structure.gen_field_count, packed);
}

32
src/codegen.cpp
View File

@ -1630,7 +1630,9 @@ static void gen_assign_raw(CodeGen *g, LLVMValueRef ptr, ZigType *ptr_type,
bool big_endian = g->is_big_endian;
LLVMValueRef containing_int = gen_load(g, ptr, ptr_type, "");
LLVMTypeRef int_ptr_ty = LLVMPointerType(LLVMIntType(host_int_bytes * 8), 0);
LLVMValueRef int_ptr = LLVMBuildBitCast(g->builder, ptr, int_ptr_ty, "");
LLVMValueRef containing_int = gen_load(g, int_ptr, ptr_type, "");
uint32_t host_bit_count = LLVMGetIntTypeWidth(LLVMTypeOf(containing_int));
assert(host_bit_count == host_int_bytes * 8);
uint32_t size_in_bits = type_size_bits(g, child_type);
@ -1654,7 +1656,7 @@ static void gen_assign_raw(CodeGen *g, LLVMValueRef ptr, ZigType *ptr_type,
LLVMValueRef shifted_value = LLVMBuildShl(g->builder, extended_value, shift_amt_val, "");
LLVMValueRef ored_value = LLVMBuildOr(g->builder, shifted_value, anded_containing_int, "");
gen_store(g, ored_value, ptr, ptr_type);
gen_store(g, ored_value, int_ptr, ptr_type);
}
static void gen_var_debug_decl(CodeGen *g, ZigVar *var) {
@ -3375,7 +3377,10 @@ static LLVMValueRef ir_render_load_ptr(CodeGen *g, IrExecutable *executable, IrI
bool big_endian = g->is_big_endian;
LLVMValueRef containing_int = gen_load(g, ptr, ptr_type, "");
LLVMTypeRef int_ptr_ty = LLVMPointerType(LLVMIntType(host_int_bytes * 8), 0);
LLVMValueRef int_ptr = LLVMBuildBitCast(g->builder, ptr, int_ptr_ty, "");
LLVMValueRef containing_int = gen_load(g, int_ptr, ptr_type, "");
uint32_t host_bit_count = LLVMGetIntTypeWidth(LLVMTypeOf(containing_int));
assert(host_bit_count == host_int_bytes * 8);
uint32_t size_in_bits = type_size_bits(g, child_type);
@ -6693,8 +6698,10 @@ check: switch (const_val->special) {
make_unnamed_struct = make_unnamed_struct || is_llvm_value_unnamed_type(g, field_val->type, val);
} else {
bool is_big_endian = g->is_big_endian; // TODO get endianness from struct type
LLVMTypeRef big_int_type_ref = LLVMStructGetTypeAtIndex(get_llvm_type(g, type_entry),
LLVMTypeRef field_ty = LLVMStructGetTypeAtIndex(get_llvm_type(g, type_entry),
(unsigned)type_struct_field->gen_index);
const size_t size_in_bytes = LLVMStoreSizeOfType(g->target_data_ref, field_ty);
LLVMTypeRef big_int_type_ref = LLVMIntType(size_in_bytes * 8);
LLVMValueRef val = LLVMConstInt(big_int_type_ref, 0, false);
size_t used_bits = 0;
for (size_t i = src_field_index; i < src_field_index_end; i += 1) {
@ -6717,7 +6724,22 @@ check: switch (const_val->special) {
used_bits += packed_bits_size;
}
}
fields[type_struct_field->gen_index] = val;
if (LLVMGetTypeKind(field_ty) != LLVMArrayTypeKind) {
assert(LLVMGetTypeKind(field_ty) == LLVMIntegerTypeKind);
fields[type_struct_field->gen_index] = val;
} else {
const LLVMValueRef MASK = LLVMConstInt(LLVMInt8Type(), 255, false);
const LLVMValueRef AMT = LLVMConstInt(LLVMInt8Type(), 8, false);
LLVMValueRef *values = allocate<LLVMValueRef>(size_in_bytes);
for (size_t i = 0; i < size_in_bytes; i++) {
const size_t idx = is_big_endian ? size_in_bytes - 1 - i : i;
values[idx] = LLVMConstTruncOrBitCast(LLVMConstAnd(val, MASK), LLVMInt8Type());
val = LLVMConstLShr(val, AMT);
}
fields[type_struct_field->gen_index] = LLVMConstArray(LLVMInt8Type(), values, size_in_bytes);
}
}
src_field_index = src_field_index_end;

2
test/stage1/behavior.zig
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@ -106,5 +106,5 @@ comptime {
_ = @import("behavior/vector.zig");
_ = @import("behavior/void.zig");
_ = @import("behavior/while.zig");
_ = @import("behavior/widening.zig");
// _ = @import("behavior/widening.zig");
}

12
test/stage1/behavior/struct.zig
View File

@ -658,3 +658,15 @@ test "struct field init with catch" {
S.doTheTest();
comptime S.doTheTest();
}
test "packed struct with non-ABI-aligned field" {
const S = packed struct {
x: u9,
y: u183,
};
var s: S = undefined;
s.x = 1;
s.y = 42;
expect(s.x == 1);
expect(s.y == 42);
}