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// Copyright 2014 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This program creates an LLVM profile from an AutoFDO source.
#include "config.h"
#if defined(HAVE_LLVM)
#include <memory>
#include "gflags/gflags.h"
#include "profile_creator.h"
#include "llvm_profile_writer.h"
DEFINE_string(profile, "perf.data", "Input profile file name");
DEFINE_string(profiler, "perf",
"Input profile type. Possible values: perf, text, or prefetch");
DEFINE_string(prefetch_hints, "", "Input cache prefetch hints");
DEFINE_string(out, "", "Output profile file name");
DEFINE_string(gcov, "",
"Output profile file name. Alias for --out; used for "
"flag compatibility with create_gcov");
DEFINE_string(binary, "a.out", "Binary file name");
DEFINE_string(format, "binary",
"LLVM profile format to emit. Possible values are 'text' or "
"'binary'. The binary format is a more compact representation, "
"but the text format is human readable and more likely to be "
"compatible with older versions of LLVM.");
#define PROG_USAGE \
"\nConverts a sample profile collected with Perf " \
"(https://perf.wiki.kernel.org/)\n" \
"into an LLVM profile. The output file can be used with\n" \
"Clang's -fprofile-sample-use flag."
int main(int argc, char **argv) {
google::SetUsageMessage(PROG_USAGE);
google::ParseCommandLineFlags(&argc, &argv, true);
google::InitGoogleLogging(argv[0]);
// If the user specified --gcov instead of --out, use that value.
// If both are used, they must match.
if (!FLAGS_gcov.empty()) {
if (!FLAGS_out.empty() && FLAGS_out != FLAGS_gcov) {
LOG(ERROR) << "--out and --gcov specified with different values.";
LOG(ERROR) << "Please use only one of the two flags.";
return 1;
}
FLAGS_out = FLAGS_gcov;
}
if (FLAGS_out.empty()) {
LOG(ERROR) << "Need a name for the generated LLVM profile file.";
LOG(ERROR) << "Use --gcov or --out to specify an output file.";
return 1;
}
std::unique_ptr<autofdo::LLVMProfileWriter> writer(nullptr);
if (FLAGS_format == "text") {
writer.reset(new autofdo::LLVMProfileWriter(llvm::sampleprof::SPF_Text));
} else if (FLAGS_format == "binary") {
writer.reset(new autofdo::LLVMProfileWriter(llvm::sampleprof::SPF_Binary));
} else {
LOG(ERROR) << "--format must be one of 'text' or 'binary'";
return 1;
}
autofdo::ProfileCreator creator(FLAGS_binary);
creator.set_use_discriminator_encoding(true);
if (creator.CreateProfile(FLAGS_profile, FLAGS_profiler, writer.get(),
FLAGS_out))
return 0;
else
return -1;
}
#else
#include <stdio.h>
int main(int argc, char **argv) {
fprintf(stderr,
"ERROR: LLVM version 5 (or higher) support was not enabled in this configuration.\n"
"Please configure and rebuild with:\n\n$ ./configure "
"--with-llvm=<absolute-path-to-llvm-config>\n\n");
return -1;
}
#endif // HAVE_LLVM
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