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https://github.com/carbon-language/carbon-lang.git
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Chandler Carruth
d010d52f37
As part of this, move functions that seem reasonable to make out-of-line to a separate `_impl.h` header file that is only included where the explicit instantiation _definition_ is provided. By using explicit instantiation we can make these templates behave more like non-template classes in terms of supporting out-of-line definitions that don't need to be compiled by every translation unit. The set of eventual instantiations here is fundamentally known, and there tend to be headers that define a canonical "leaf" type where it makes sense to trigger the explicit instantiation. Where we already had a `.cpp` file to put the explicit instantiation definition, use it. But in some places we didn't have such a `.cpp` file so this PR adds those. This also requires that we have precise constraints on APIs that _can't_ be instantiated for specific argument types, as now we don't do this lazily. Combined, this appears to reduce the sum of object file sizes in the `check` directory by almost 40% (122mb -> 74mb) in my measurement. My actual goal was to improve compile times, but so far I don't have a great methodology for measuring these... But the object file size reduction seems to confirm this is a net win and likely represents a non-trivial improvement in compile time. Assisted-by: Antigravity with Gemini
59 lines
1.8 KiB
C++
59 lines
1.8 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/sem_ir/class.h"
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#include "toolchain/base/value_store_impl.h"
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#include "toolchain/sem_ir/file.h"
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#include "toolchain/sem_ir/generic.h"
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#include "toolchain/sem_ir/ids.h"
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#include "toolchain/sem_ir/typed_insts.h"
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namespace Carbon::SemIR {
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static auto GetFoundationType(const File& file, SpecificId specific_id,
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InstId inst_id) -> TypeId {
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if (!inst_id.has_value()) {
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return TypeId::None;
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}
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if (inst_id == ErrorInst::InstId) {
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return ErrorInst::TypeId;
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}
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return TypeId::ForTypeConstant(GetConstantValueInSpecific(
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file, specific_id,
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file.insts().GetAs<AnyFoundationDecl>(inst_id).foundation_type_inst_id));
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}
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auto Class::GetAdaptedType(const File& file, SpecificId specific_id) const
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-> TypeId {
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return GetFoundationType(file, specific_id, adapt_id);
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}
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auto Class::GetBaseType(const File& file, SpecificId specific_id) const
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-> TypeId {
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return GetFoundationType(file, specific_id, base_id);
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}
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auto Class::GetObjectRepr(const File& file, SpecificId specific_id) const
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-> TypeId {
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if (!complete_type_witness_id.has_value()) {
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return TypeId::None;
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}
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auto witness_id =
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GetConstantValueInSpecific(file, specific_id, complete_type_witness_id);
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if (witness_id == ErrorInst::ConstantId) {
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return ErrorInst::TypeId;
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}
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return file.types().GetTypeIdForTypeInstId(
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file.constant_values()
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.GetInstAs<CompleteTypeWitness>(witness_id)
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.object_repr_type_inst_id);
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}
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} // namespace Carbon::SemIR
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namespace Carbon {
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template class ValueStore<SemIR::ClassId, SemIR::Class, Tag<SemIR::CheckIRId>>;
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} // namespace Carbon
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