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//===- SampleProfWriter.cpp - Write LLVM sample profile data --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the class that writes LLVM sample profiles. It
// supports two file formats: text and binary. The textual representation
// is useful for debugging and testing purposes. The binary representation
// is more compact, resulting in smaller file sizes. However, they can
// both be used interchangeably.
//
// See lib/ProfileData/SampleProfReader.cpp for documentation on each of the
// supported formats.
//
//===----------------------------------------------------------------------===//
#include "llvm/ProfileData/SampleProfWriter.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/Regex.h"
using namespace llvm::sampleprof;
using namespace llvm;
/// \brief Write samples to a text file.
bool SampleProfileWriterText::write(StringRef FName, const FunctionSamples &S) {
if (S.empty())
return true;
OS << FName << ":" << S.getTotalSamples() << ":" << S.getHeadSamples()
<< "\n";
for (const auto &I : S.getBodySamples()) {
LineLocation Loc = I.first;
const SampleRecord &Sample = I.second;
if (Loc.Discriminator == 0)
OS << Loc.LineOffset << ": ";
else
OS << Loc.LineOffset << "." << Loc.Discriminator << ": ";
OS << Sample.getSamples();
for (const auto &J : Sample.getCallTargets())
OS << " " << J.first() << ":" << J.second;
OS << "\n";
}
return true;
}
SampleProfileWriterBinary::SampleProfileWriterBinary(StringRef F,
std::error_code &EC)
: SampleProfileWriter(F, EC, sys::fs::F_None) {
if (EC)
return;
// Write the file header.
encodeULEB128(SPMagic(), OS);
encodeULEB128(SPVersion(), OS);
}
/// \brief Write samples to a binary file.
///
/// \returns true if the samples were written successfully, false otherwise.
bool SampleProfileWriterBinary::write(StringRef FName,
const FunctionSamples &S) {
if (S.empty())
return true;
OS << FName;
encodeULEB128(0, OS);
encodeULEB128(S.getTotalSamples(), OS);
encodeULEB128(S.getHeadSamples(), OS);
encodeULEB128(S.getBodySamples().size(), OS);
for (const auto &I : S.getBodySamples()) {
LineLocation Loc = I.first;
const SampleRecord &Sample = I.second;
encodeULEB128(Loc.LineOffset, OS);
encodeULEB128(Loc.Discriminator, OS);
encodeULEB128(Sample.getSamples(), OS);
encodeULEB128(Sample.getCallTargets().size(), OS);
for (const auto &J : Sample.getCallTargets()) {
std::string Callee = J.first();
unsigned CalleeSamples = J.second;
OS << Callee;
encodeULEB128(0, OS);
encodeULEB128(CalleeSamples, OS);
}
}
return true;
}
/// \brief Create a sample profile writer based on the specified format.
///
/// \param Filename The file to create.
///
/// \param Writer The writer to instantiate according to the specified format.
///
/// \param Format Encoding format for the profile file.
///
/// \returns an error code indicating the status of the created writer.
ErrorOr<std::unique_ptr<SampleProfileWriter>>
SampleProfileWriter::create(StringRef Filename, SampleProfileFormat Format) {
std::error_code EC;
std::unique_ptr<SampleProfileWriter> Writer;
if (Format == SPF_Binary)
Writer.reset(new SampleProfileWriterBinary(Filename, EC));
else if (Format == SPF_Text)
Writer.reset(new SampleProfileWriterText(Filename, EC));
else
EC = sampleprof_error::unrecognized_format;
if (EC)
return EC;
return std::move(Writer);
}
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