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David Blaikie
4739828cca
Fixes #5186 With @zygoloid's kind assistance, this generalizes the existing non-const lowering of ClassInit, that had previously only handled InitializeFrom, to find other cases - such as a nested ClassInit used to initialize a class member. This refactors the `FindReturnSlotArgForInitializer` from `check/convert.cpp` into `sem_ir/file.{h,cpp}` for use from lowering (since lower doesn't depend on check, which I assume is an intentional layering constraint - so figured it made sense to move it to sem_ir, and found one or two similar-ish utility functions in `sem_ir/file.{h,cpp}`, so figured that was a good spot)
72 lines
3.0 KiB
C++
72 lines
3.0 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "toolchain/lower/function_context.h"
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#include "toolchain/sem_ir/expr_info.h"
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#include "toolchain/sem_ir/file.h"
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namespace Carbon::Lower {
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::BindValue inst) -> void {
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switch (auto rep = SemIR::ValueRepr::ForType(context.sem_ir(), inst.type_id);
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rep.kind) {
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case SemIR::ValueRepr::Unknown:
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CARBON_FATAL(
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"Value binding for type with incomplete value representation");
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case SemIR::ValueRepr::None:
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// Nothing should use this value, but StubRef needs a value to
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// propagate.
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// TODO: Remove this now the StubRefs are gone.
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context.SetLocal(inst_id,
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llvm::PoisonValue::get(context.GetType(inst.type_id)));
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break;
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case SemIR::ValueRepr::Copy:
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context.SetLocal(inst_id, context.builder().CreateLoad(
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context.GetType(inst.type_id),
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context.GetValue(inst.value_id)));
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break;
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case SemIR::ValueRepr::Pointer:
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context.SetLocal(inst_id, context.GetValue(inst.value_id));
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break;
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case SemIR::ValueRepr::Custom:
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CARBON_FATAL("TODO: Add support for BindValue with custom value rep");
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}
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::Temporary inst) -> void {
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context.FinishInit(inst.type_id, inst.storage_id, inst.init_id);
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context.SetLocal(inst_id, context.GetValue(inst.storage_id));
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::TemporaryStorage inst) -> void {
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context.SetLocal(inst_id,
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context.builder().CreateAlloca(context.GetType(inst.type_id),
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nullptr, "temp"));
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::ValueAsRef inst) -> void {
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CARBON_CHECK(SemIR::GetExprCategory(context.sem_ir(), inst.value_id) ==
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SemIR::ExprCategory::Value);
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CARBON_CHECK(SemIR::ValueRepr::ForType(context.sem_ir(), inst.type_id).kind ==
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SemIR::ValueRepr::Pointer);
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context.SetLocal(inst_id, context.GetValue(inst.value_id));
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::ValueOfInitializer inst) -> void {
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CARBON_CHECK(SemIR::GetExprCategory(context.sem_ir(), inst.init_id) ==
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SemIR::ExprCategory::Initializing);
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CARBON_CHECK(SemIR::ValueRepr::ForType(context.sem_ir(), inst.type_id).kind ==
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SemIR::ValueRepr::Copy);
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CARBON_CHECK(SemIR::InitRepr::ForType(context.sem_ir(), inst.type_id).kind ==
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SemIR::InitRepr::ByCopy);
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context.SetLocal(inst_id, context.GetValue(inst.init_id));
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}
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} // namespace Carbon::Lower
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