mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-03 08:05:49 +01:00
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
49 lines
1.6 KiB
C++
49 lines
1.6 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_VTABLE_H_
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#define CARBON_TOOLCHAIN_SEM_IR_VTABLE_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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// Vtable-specific fields.
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struct VtableFields {
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// The class this is the vtable for.
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ClassId class_id;
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// A block containing all the virtual functions in this class and
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// non-overriden functions in base classes, forming the complete vtable for
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// the class.
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InstBlockId virtual_functions_id;
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// Specifies that this vtable uses Carbon's native vtable layout, rather than
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// an Itanium-compatible vtable layout for C++ interop.
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// TODO: This might change to an enum representing more diverse vtable layouts
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// (eg: Carbon type with a C++ vtable distinct from a C++ type with a C++
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// vtable, maybe other language interop, etc)
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bool carbon_native_vtable = true;
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};
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struct Vtable : public VtableFields, public Printable<Vtable> {
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auto Print(llvm::raw_ostream& out) const -> void {
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out << "{class: " << class_id << ", {";
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virtual_functions_id.Print(out);
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out << "}}";
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}
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};
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using VtableStore = ValueStore<VtableId, Vtable, Tag<CheckIRId>>;
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} // namespace Carbon::SemIR
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namespace Carbon {
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extern template class ValueStore<SemIR::VtableId, SemIR::Vtable,
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Tag<SemIR::CheckIRId>>;
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_SEM_IR_VTABLE_H_
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