mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 19:31:08 +01:00
Dana Jansens
64139e5d65
This takes the debug runtime of `toolchain/check/testdata/interop/cpp/function/arithmetic_types_bridged.carbon` from 4.7s down to about 4s (so 15% faster overall). There's still lots of room to improve this test which seems to be hitting lots of pathological behaviour, but InstNamer is 30% of the runtime, with fingerprinting's `InstFingerprinter::GetOrCompute` consuming 10% of cycles. We reduce its impact by using a vector of vectors instead of a Map for the cache of fingerprints. After this change InstNamer drops below 24% of the runtime. Also move the instruction name when giving it to `AllocateName` since it receives std::string by value, though this doesn't show up in the profile for the test.
86 lines
3.2 KiB
C++
86 lines
3.2 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_LOWER_MANGLER_H_
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#define CARBON_TOOLCHAIN_LOWER_MANGLER_H_
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#include <string>
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#include "clang/AST/Mangle.h"
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#include "toolchain/lower/file_context.h"
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#include "toolchain/sem_ir/constant.h"
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#include "toolchain/sem_ir/ids.h"
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#include "toolchain/sem_ir/inst_fingerprinter.h"
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namespace Carbon::Lower {
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// A class for producing mangled (deterministically unique, at least partially
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// human readable) names for externally referenceable entities such as
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// functions.
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class Mangler {
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public:
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// Initialize a new Mangler instance for mangling entities within the
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// specified `FileContext`.
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explicit Mangler(FileContext& file_context)
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: file_context_(file_context),
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fingerprinter_(file_context_.context().total_ir_count()) {}
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// Produce a deterministically unique mangled name for the function specified
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// by `function_id` and `specific_id`.
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auto Mangle(SemIR::FunctionId function_id, SemIR::SpecificId specific_id)
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-> std::string;
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// Produce a deterministically unique mangled name for the given global
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// variable pattern, or an empty string if the variable doesn't bind any
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// names, in which case it can't be referenced from another file and should be
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// given internal linkage.
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auto MangleGlobalVariable(SemIR::InstId pattern_id) -> std::string;
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// Produce a deterministically unique mangled name for the specified class's
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// vtable.
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auto MangleVTable(const SemIR::Class& class_info,
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SemIR::SpecificId specific_id) -> std::string;
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private:
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// Mangle this `NameId` as an individual name component.
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auto MangleNameId(llvm::raw_ostream& os, SemIR::NameId name_id) -> void;
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// Mangle this `SpecificId`, or nothing if it is `SpecificId::None`.
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auto MangleSpecificId(llvm::raw_ostream& os, SemIR::SpecificId specific_id)
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-> void;
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// Mangle this qualified name with inner scope first, working outwards. This
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// may reduce the incidence of common prefixes in the name mangling. (i.e.:
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// every standard library name won't have a common prefix that has to be
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// skipped and compared before getting to the interesting part)
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auto MangleInverseQualifiedNameScope(llvm::raw_ostream& os,
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SemIR::NameScopeId name_scope_id)
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-> void;
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// Generates a mangled name using Clang mangling for imported C++ functions.
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auto MangleCppClang(const clang::NamedDecl* decl) -> std::string;
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auto sem_ir() const -> const SemIR::File& { return file_context_.sem_ir(); }
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auto names() const -> SemIR::NameStoreWrapper { return sem_ir().names(); }
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auto insts() const -> const SemIR::InstStore& { return sem_ir().insts(); }
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auto types() const -> const SemIR::TypeStore& { return sem_ir().types(); }
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auto constant_values() const -> const SemIR::ConstantValueStore& {
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return sem_ir().constant_values();
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}
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FileContext& file_context_;
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// TODO: If `file_context_` has an `InstNamer`, we could share its
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// fingerprinter.
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SemIR::InstFingerprinter fingerprinter_;
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};
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} // namespace Carbon::Lower
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#endif // CARBON_TOOLCHAIN_LOWER_MANGLER_H_
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