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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
53 lines
1.7 KiB
C++
53 lines
1.7 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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#ifndef CARBON_TOOLCHAIN_SEM_IR_CPP_OVERLOAD_SET_H_
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#define CARBON_TOOLCHAIN_SEM_IR_CPP_OVERLOAD_SET_H_
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#include "clang/AST/Decl.h"
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#include "clang/AST/UnresolvedSet.h"
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#include "clang/Sema/Overload.h"
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#include "common/ostream.h"
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#include "toolchain/base/value_store.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::SemIR {
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// An overloaded C++ function.
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struct CppOverloadSet : public Printable<CppOverloadSet> {
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// The function's name.
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NameId name_id;
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// The parent scope.
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NameScopeId parent_scope_id;
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// The naming class in the name lookup that found this overload set.
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clang::CXXRecordDecl* naming_class;
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// List of all named decls found at name lookup.
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// TODO: Find a good small size for the UnresolvedSet<size> or rework how we
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// store the candidates.
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clang::UnresolvedSet<4> candidate_functions;
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/// Information about operator rewrites to consider when adding operator
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/// functions to a candidate set.
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clang::OverloadCandidateSet::OperatorRewriteInfo operator_rewrite_info;
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auto Print(llvm::raw_ostream& out) const -> void {
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out << "name: " << name_id << ", parent_scope: " << parent_scope_id;
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}
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};
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using CppOverloadSetStore =
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ValueStore<CppOverloadSetId, CppOverloadSet, Tag<CheckIRId>>;
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} // namespace Carbon::SemIR
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namespace Carbon {
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extern template class ValueStore<SemIR::CppOverloadSetId, SemIR::CppOverloadSet,
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Tag<SemIR::CheckIRId>>;
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_SEM_IR_CPP_OVERLOAD_SET_H_
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