mirror of
https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandRichard Smith
e5b05a1fac
The primary change in this PR is to split the `Initializing` expression category into separate `ReprInitializing` and `InPlaceInitializing` categories, depending on whether initialization uses the types initializing representation, or is guaranteed to be in place. It also rationalizes and documents the SemIR-level semantics of those categories (including where #5545's "ephemeral entire reference" category will fit), and introduces two new inst kinds to close gaps exposed in the process. Some additional secondary changes: - Consistently format the storage arguments of initializers with `to`, regardless of whether initialization is in-place, and document the `to` notation. - Rename some inst kinds and functions, and restructure some of the code, for clarity and consistency with the new documentation. - Resolve a TODO to handle more category conversions in `CategoryConverter`, in order to make it easier to reason about category conversions. See #6588 and the review history of this PR for background. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
85 lines
3.4 KiB
C++
85 lines
3.4 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::AcquireValue inst) -> void {
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auto inst_type = context.GetTypeIdOfInst(inst_id);
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switch (context.GetValueRepr(inst_type).repr.kind) {
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case SemIR::ValueRepr::Unknown:
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CARBON_FATAL(
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"Value acquisition for type with incomplete value representation");
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case SemIR::ValueRepr::Dependent:
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CARBON_FATAL(
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"Value acquisition for type with dependent 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)));
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break;
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case SemIR::ValueRepr::Copy:
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context.SetLocal(
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inst_id,
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context.LoadObject(inst_type, 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 AcquireValue 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::MarkInPlaceInit inst) -> void {
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context.SetLocal(inst_id, context.GetValue(inst.dest_id));
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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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if (SemIR::GetExprCategory(context.sem_ir(), inst.init_id) !=
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SemIR::ExprCategory::InPlaceInitializing) {
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context.InitializeStorage(context.GetTypeIdOfInst(inst_id), inst.storage_id,
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inst.init_id);
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}
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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(
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inst_id, context.CreateAlloca(context.GetTypeOfInst(inst_id), "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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auto inst_type = context.GetTypeIdOfInst(inst_id);
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auto value_repr = context.GetValueRepr(inst_type);
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CARBON_CHECK(value_repr.repr.kind == 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::ReprInitializing);
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auto inst_type = context.GetTypeIdOfInst(inst_id);
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auto value_repr = context.GetValueRepr(inst_type);
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auto init_repr = context.GetInitRepr(inst_type);
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CARBON_CHECK(value_repr.repr.kind == SemIR::ValueRepr::Copy);
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CARBON_CHECK(init_repr.kind == 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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