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//===- llvm-profgen.cpp - LLVM SPGO profile generation tool -----*- 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
//
//===----------------------------------------------------------------------===//
//
// llvm-profgen generates SPGO profiles from perf script ouput.
//
//===----------------------------------------------------------------------===//
#include "ErrorHandling.h"
#include "PerfReader.h"
#include "ProfileGenerator.h"
#include "ProfiledBinary.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/TargetSelect.h"
static cl::OptionCategory ProfGenCategory("ProfGen Options");
static cl::list<std::string> PerfTraceFilenames(
"perfscript", cl::value_desc("perfscript"), cl::OneOrMore,
llvm::cl::MiscFlags::CommaSeparated,
cl::desc("Path of perf-script trace created by Linux perf tool with "
"`script` command(the raw perf.data should be profiled with -b)"),
cl::cat(ProfGenCategory));
static cl::list<std::string>
BinaryFilenames("binary", cl::value_desc("binary"), cl::OneOrMore,
llvm::cl::MiscFlags::CommaSeparated,
cl::desc("Path of profiled binary files"),
cl::cat(ProfGenCategory));
extern cl::opt<bool> ShowDisassemblyOnly;
using namespace llvm;
using namespace sampleprof;
int main(int argc, const char *argv[]) {
InitLLVM X(argc, argv);
// Initialize targets and assembly printers/parsers.
InitializeAllTargetInfos();
InitializeAllTargetMCs();
InitializeAllDisassemblers();
cl::HideUnrelatedOptions({&ProfGenCategory, &getColorCategory()});
cl::ParseCommandLineOptions(argc, argv, "llvm SPGO profile generator\n");
// Load binaries and parse perf events and samples
PerfReader Reader(BinaryFilenames, PerfTraceFilenames);
if (ShowDisassemblyOnly)
return EXIT_SUCCESS;
Reader.parsePerfTraces(PerfTraceFilenames);
std::unique_ptr<ProfileGenerator> Generator = ProfileGenerator::create(
Reader.getBinarySampleCounters(), Reader.getPerfScriptType());
Generator->generateProfile();
Generator->write();
return EXIT_SUCCESS;
}
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