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async function calls re-use frame buffers

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See #3069
This commit is contained in:
Andrew Kelley 2019-09-10 22:59:00 -04:00
parent 7101e583d6
commit c9b2210fcf
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GPG Key ID: 7C5F548F728501A9
2 changed files with 33 additions and 3 deletions
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23
src/analyze.cpp
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@ -2538,6 +2538,8 @@ static Error resolve_enum_zero_bits(CodeGen *g, ZigType *enum_type) {
enum_type->data.enumeration.resolve_loop_flag = false;
enum_type->data.enumeration.resolve_status = ResolveStatusSizeKnown;
occupied_tag_values.deinit();
return ErrorNone;
}
@ -5878,6 +5880,11 @@ static Error resolve_async_frame(CodeGen *g, ZigType *frame_type) {
fn->err_code_spill = &alloca_gen->base;
}
ZigType *largest_call_frame_type = nullptr;
// Later we'll change this to be largest_call_frame_type instead of void.
IrInstruction *all_calls_alloca = ir_create_alloca(g, &fn->fndef_scope->base, fn->body_node,
fn, g->builtin_types.entry_void, "@async_call_frame");
for (size_t i = 0; i < fn->call_list.length; i += 1) {
IrInstructionCallGen *call = fn->call_list.at(i);
if (call->new_stack != nullptr) {
@ -5921,9 +5928,21 @@ static Error resolve_async_frame(CodeGen *g, ZigType *frame_type) {
mark_suspension_point(call->base.scope);
call->frame_result_loc = ir_create_alloca(g, call->base.scope, call->base.source_node, fn,
callee_frame_type, "");
if ((err = type_resolve(g, callee_frame_type, ResolveStatusSizeKnown))) {
return err;
}
if (largest_call_frame_type == nullptr ||
callee_frame_type->abi_size > largest_call_frame_type->abi_size)
{
largest_call_frame_type = callee_frame_type;
}
call->frame_result_loc = all_calls_alloca;
}
if (largest_call_frame_type != nullptr) {
all_calls_alloca->value.type = get_pointer_to_type(g, largest_call_frame_type, false);
}
// Since this frame is async, an await might represent a suspend point, and
// therefore need to spill. It also needs to mark expr scopes as having to spill.
// For example: foo() + await z

13
src/codegen.cpp
View File

@ -3863,6 +3863,7 @@ static LLVMValueRef ir_render_call(CodeGen *g, IrExecutable *executable, IrInstr
ZigList<ZigType *> gen_param_types = {};
LLVMValueRef result_loc = instruction->result_loc ? ir_llvm_value(g, instruction->result_loc) : nullptr;
LLVMValueRef zero = LLVMConstNull(usize_type_ref);
LLVMValueRef frame_result_loc_uncasted = nullptr;
LLVMValueRef frame_result_loc;
LLVMValueRef awaiter_init_val;
LLVMValueRef ret_ptr;
@ -3871,7 +3872,10 @@ static LLVMValueRef ir_render_call(CodeGen *g, IrExecutable *executable, IrInstr
if (instruction->modifier == CallModifierAsync) {
frame_result_loc = result_loc;
} else {
frame_result_loc = ir_llvm_value(g, instruction->frame_result_loc);
frame_result_loc_uncasted = ir_llvm_value(g, instruction->frame_result_loc);
src_assert(instruction->fn_entry != nullptr, instruction->base.source_node);
frame_result_loc = LLVMBuildBitCast(g->builder, frame_result_loc_uncasted,
LLVMPointerType(get_llvm_type(g, instruction->fn_entry->frame_type), 0), "");
}
} else {
if (instruction->new_stack->value.type->id == ZigTypeIdPointer &&
@ -4138,6 +4142,13 @@ static LLVMValueRef ir_render_call(CodeGen *g, IrExecutable *executable, IrInstr
}
}
if (frame_result_loc_uncasted != nullptr && instruction->fn_entry != nullptr) {
// Instead of a spill, we do the bitcast again. The uncasted LLVM IR instruction will
// be an Alloca from the entry block, so it does not need to be spilled.
frame_result_loc = LLVMBuildBitCast(g->builder, frame_result_loc_uncasted,
LLVMPointerType(get_llvm_type(g, instruction->fn_entry->frame_type), 0), "");
}
LLVMValueRef result_ptr = LLVMBuildStructGEP(g->builder, frame_result_loc, frame_ret_start + 2, "");
return LLVMBuildLoad(g->builder, result_ptr, "");
}