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//===--- Benchmark.cpp - clang pseudoparser benchmarks ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Benchmark for the overall pseudoparser performance, it also includes other
// important pieces of the pseudoparser (grammar compliation, LR table build
// etc).
//
// Note: make sure to build the benchmark in Release mode.
//
// Usage:
// tools/clang/tools/extra/pseudo/benchmarks/ClangPseudoBenchmark \
// --grammar=../clang-tools-extra/pseudo/lib/cxx.bnf \
// --source=../clang/lib/Sema/SemaDecl.cpp
//
//===----------------------------------------------------------------------===//
#include "benchmark/benchmark.h"
#include "clang-pseudo/Bracket.h"
#include "clang-pseudo/DirectiveTree.h"
#include "clang-pseudo/Forest.h"
#include "clang-pseudo/GLR.h"
#include "clang-pseudo/Token.h"
#include "clang-pseudo/cli/CLI.h"
#include "clang-pseudo/grammar/Grammar.h"
#include "clang-pseudo/grammar/LRTable.h"
#include "clang/Basic/LangOptions.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
using llvm::cl::desc;
using llvm::cl::opt;
using llvm::cl::Required;
static opt<std::string> Source("source", desc("Source file"), Required);
namespace clang {
namespace pseudo {
namespace bench {
namespace {
const std::string *SourceText = nullptr;
const Language *Lang = nullptr;
void setup() {
auto ReadFile = [](llvm::StringRef FilePath) -> std::string {
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> GrammarText =
llvm::MemoryBuffer::getFile(FilePath);
if (std::error_code EC = GrammarText.getError()) {
llvm::errs() << "Error: can't read file '" << FilePath
<< "': " << EC.message() << "\n";
std::exit(1);
}
return GrammarText.get()->getBuffer().str();
};
SourceText = new std::string(ReadFile(Source));
Lang = &getLanguageFromFlags();
}
static void buildSLR(benchmark::State &State) {
for (auto _ : State)
LRTable::buildSLR(Lang->G);
}
BENCHMARK(buildSLR);
TokenStream lexAndPreprocess() {
clang::LangOptions LangOpts = genericLangOpts();
TokenStream RawStream = pseudo::lex(*SourceText, LangOpts);
auto DirectiveStructure = DirectiveTree::parse(RawStream);
chooseConditionalBranches(DirectiveStructure, RawStream);
TokenStream Cook =
cook(DirectiveStructure.stripDirectives(RawStream), LangOpts);
auto Stream = stripComments(Cook);
pairBrackets(Stream);
return Stream;
}
static void lex(benchmark::State &State) {
clang::LangOptions LangOpts = genericLangOpts();
for (auto _ : State)
clang::pseudo::lex(*SourceText, LangOpts);
State.SetBytesProcessed(static_cast<uint64_t>(State.iterations()) *
SourceText->size());
}
BENCHMARK(lex);
static void pairBrackets(benchmark::State &State) {
clang::LangOptions LangOpts = genericLangOpts();
auto Stream = clang::pseudo::lex(*SourceText, LangOpts);
for (auto _ : State)
pairBrackets(Stream);
State.SetBytesProcessed(static_cast<uint64_t>(State.iterations()) *
SourceText->size());
}
BENCHMARK(pairBrackets);
static void preprocess(benchmark::State &State) {
clang::LangOptions LangOpts = genericLangOpts();
TokenStream RawStream = clang::pseudo::lex(*SourceText, LangOpts);
for (auto _ : State) {
auto DirectiveStructure = DirectiveTree::parse(RawStream);
chooseConditionalBranches(DirectiveStructure, RawStream);
stripComments(
cook(DirectiveStructure.stripDirectives(RawStream), LangOpts));
}
State.SetBytesProcessed(static_cast<uint64_t>(State.iterations()) *
SourceText->size());
}
BENCHMARK(preprocess);
static void glrParse(benchmark::State &State) {
SymbolID StartSymbol = *Lang->G.findNonterminal("translation-unit");
TokenStream Stream = lexAndPreprocess();
for (auto _ : State) {
pseudo::ForestArena Forest;
pseudo::GSS GSS;
pseudo::glrParse(ParseParams{Stream, Forest, GSS}, StartSymbol, *Lang);
}
State.SetBytesProcessed(static_cast<uint64_t>(State.iterations()) *
SourceText->size());
}
BENCHMARK(glrParse);
static void full(benchmark::State &State) {
SymbolID StartSymbol = *Lang->G.findNonterminal("translation-unit");
for (auto _ : State) {
TokenStream Stream = lexAndPreprocess();
pseudo::ForestArena Forest;
pseudo::GSS GSS;
pseudo::glrParse(ParseParams{Stream, Forest, GSS}, StartSymbol, *Lang);
}
State.SetBytesProcessed(static_cast<uint64_t>(State.iterations()) *
SourceText->size());
}
BENCHMARK(full);
} // namespace
} // namespace bench
} // namespace pseudo
} // namespace clang
int main(int argc, char *argv[]) {
benchmark::Initialize(&argc, argv);
llvm::cl::ParseCommandLineOptions(argc, argv);
clang::pseudo::bench::setup();
benchmark::RunSpecifiedBenchmarks();
return 0;
}
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