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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
65 lines
2.4 KiB
C++
65 lines
2.4 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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#ifndef CARBON_TOOLCHAIN_SEM_IR_REQUIRE_IMPLS_H_
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#define CARBON_TOOLCHAIN_SEM_IR_REQUIRE_IMPLS_H_
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#include "toolchain/base/block_value_store.h"
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#include "toolchain/base/canonical_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 interface requirement from an interface or named constraint, written
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// `require T impls Z`.
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//
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// While this comes from a `require` declaration, it is not an Entity like most
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// other declarations, with a name and parameters, so it does not inherit
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// EntityWithParamsBase.
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struct RequireImpls : Printable<RequireImpls> {
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// The self-type which must implement a given facet type.
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TypeInstId self_id;
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// Evaluates to the `FacetType` that the self-type must implement.
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TypeInstId facet_type_inst_id;
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// If the facet type extends `Self`. When true, the `self_id` will be `Self`.
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bool extend_self;
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// The location of the `require` declaration.
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InstId decl_id;
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// The interface or named constraint which contains the `require` declaration.
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NameScopeId parent_scope_id;
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// A `require` declaration is always generic over `Self` since it's inside an
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// interface or named constraint definition.
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GenericId generic_id;
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auto Print(llvm::raw_ostream& out) const -> void {
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out << '{';
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out << "self_id: " << self_id
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<< ", facet_type_inst_id: " << facet_type_inst_id
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<< ", extend_self: " << (extend_self ? "true" : "false")
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<< ", parent_scope: " << parent_scope_id;
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out << '}';
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}
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};
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using RequireImplsStore =
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ValueStore<RequireImplsId, RequireImpls, Tag<CheckIRId>>;
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using RequireImplsBlockStore =
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BlockValueStore<RequireImplsBlockId, RequireImplsId, Tag<CheckIRId>>;
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} // namespace Carbon::SemIR
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namespace Carbon {
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extern template class ValueStore<SemIR::RequireImplsId, SemIR::RequireImpls,
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Tag<SemIR::CheckIRId>>;
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extern template class ValueStore<SemIR::RequireImplsBlockId,
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llvm::MutableArrayRef<SemIR::RequireImplsId>,
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Tag<SemIR::CheckIRId>>;
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extern template class BlockValueStore<
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SemIR::RequireImplsBlockId, SemIR::RequireImplsId, Tag<SemIR::CheckIRId>>;
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_SEM_IR_REQUIRE_IMPLS_H_
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