mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Geoff Romer
39503a5561
This proposal removes the definition of the term "value binding" as a primitive category conversion from reference to value, replacing it with the term "value acquisition". The other meaning of "value binding", a binding declared by a value binding pattern, is unchanged.
115 lines
4.4 KiB
C++
115 lines
4.4 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#include "toolchain/lower/function_context.h"
|
|
#include "toolchain/sem_ir/expr_info.h"
|
|
#include "toolchain/sem_ir/file.h"
|
|
|
|
namespace Carbon::Lower {
|
|
|
|
auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
|
|
SemIR::BindValue inst) -> void {
|
|
auto inst_type = context.GetTypeIdOfInst(inst_id);
|
|
switch (context.GetValueRepr(inst_type).repr.kind) {
|
|
case SemIR::ValueRepr::Unknown:
|
|
CARBON_FATAL(
|
|
"Value acquisition for type with incomplete value representation");
|
|
case SemIR::ValueRepr::Dependent:
|
|
CARBON_FATAL(
|
|
"Value acquisition for type with dependent value representation");
|
|
case SemIR::ValueRepr::None:
|
|
// Nothing should use this value, but StubRef needs a value to
|
|
// propagate.
|
|
// TODO: Remove this now the StubRefs are gone.
|
|
context.SetLocal(inst_id,
|
|
llvm::PoisonValue::get(context.GetType(inst_type)));
|
|
break;
|
|
case SemIR::ValueRepr::Copy:
|
|
context.SetLocal(
|
|
inst_id,
|
|
context.LoadObject(inst_type, context.GetValue(inst.value_id)));
|
|
break;
|
|
case SemIR::ValueRepr::Pointer:
|
|
context.SetLocal(inst_id, context.GetValue(inst.value_id));
|
|
break;
|
|
case SemIR::ValueRepr::Custom:
|
|
CARBON_FATAL("TODO: Add support for BindValue with custom value rep");
|
|
}
|
|
}
|
|
|
|
auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
|
|
SemIR::InPlaceInit inst) -> void {
|
|
auto type = context.GetTypeIdOfInst(inst_id);
|
|
auto* value = context.GetValue(inst.dest_id);
|
|
|
|
// If the initializing representation is by-value, and the value
|
|
// representation is by-copy, then we need to load from the storage. Otherwise
|
|
// we want a pointer to the result.
|
|
switch (context.GetInitRepr(type).kind) {
|
|
case SemIR::InitRepr::None:
|
|
case SemIR::InitRepr::InPlace:
|
|
break;
|
|
case SemIR::InitRepr::ByCopy:
|
|
switch (context.GetValueRepr(type).repr.kind) {
|
|
case SemIR::ValueRepr::Unknown:
|
|
CARBON_FATAL("Unexpected incomplete type");
|
|
case SemIR::ValueRepr::Dependent:
|
|
CARBON_FATAL("Unexpected dependent type");
|
|
case SemIR::ValueRepr::None:
|
|
case SemIR::ValueRepr::Pointer:
|
|
break;
|
|
case SemIR::ValueRepr::Copy:
|
|
value = context.builder().CreateLoad(context.GetType(type), value);
|
|
break;
|
|
case SemIR::ValueRepr::Custom:
|
|
CARBON_FATAL(
|
|
"TODO: Add support for InPlaceInit with custom value rep");
|
|
}
|
|
break;
|
|
case SemIR::InitRepr::Incomplete:
|
|
CARBON_FATAL("Unexpected incomplete type");
|
|
case SemIR::InitRepr::Dependent:
|
|
CARBON_FATAL("Unexpected dependent type");
|
|
}
|
|
|
|
context.SetLocal(inst_id, value);
|
|
}
|
|
|
|
auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
|
|
SemIR::Temporary inst) -> void {
|
|
context.FinishInit(context.GetTypeIdOfInst(inst_id), inst.storage_id,
|
|
inst.init_id);
|
|
context.SetLocal(inst_id, context.GetValue(inst.storage_id));
|
|
}
|
|
|
|
auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
|
|
SemIR::TemporaryStorage /*inst*/) -> void {
|
|
context.SetLocal(
|
|
inst_id, context.CreateAlloca(context.GetTypeOfInst(inst_id), "temp"));
|
|
}
|
|
|
|
auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
|
|
SemIR::ValueAsRef inst) -> void {
|
|
CARBON_CHECK(SemIR::GetExprCategory(context.sem_ir(), inst.value_id) ==
|
|
SemIR::ExprCategory::Value);
|
|
auto inst_type = context.GetTypeIdOfInst(inst_id);
|
|
auto value_repr = context.GetValueRepr(inst_type);
|
|
CARBON_CHECK(value_repr.repr.kind == SemIR::ValueRepr::Pointer);
|
|
context.SetLocal(inst_id, context.GetValue(inst.value_id));
|
|
}
|
|
|
|
auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
|
|
SemIR::ValueOfInitializer inst) -> void {
|
|
CARBON_CHECK(SemIR::GetExprCategory(context.sem_ir(), inst.init_id) ==
|
|
SemIR::ExprCategory::Initializing);
|
|
auto inst_type = context.GetTypeIdOfInst(inst_id);
|
|
auto value_repr = context.GetValueRepr(inst_type);
|
|
auto init_repr = context.GetInitRepr(inst_type);
|
|
CARBON_CHECK(value_repr.repr.kind == SemIR::ValueRepr::Copy);
|
|
CARBON_CHECK(init_repr.kind == SemIR::InitRepr::ByCopy);
|
|
context.SetLocal(inst_id, context.GetValue(inst.init_id));
|
|
}
|
|
|
|
} // namespace Carbon::Lower
|