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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(const Function &F,
const FunctionSamples &S) {
if (S.empty())
return true;
OS << F.getName() << ":" << S.getTotalSamples() << ":" << S.getHeadSamples()
<< "\n";
for (BodySampleMap::const_iterator I = S.getBodySamples().begin(),
E = S.getBodySamples().end();
I != E; ++I) {
LineLocation Loc = I->first;
SampleRecord Sample = I->second;
if (Loc.Discriminator == 0)
OS << Loc.LineOffset << ": ";
else
OS << Loc.LineOffset << "." << Loc.Discriminator << ": ";
OS << Sample.getSamples();
for (SampleRecord::CallTargetList::const_iterator
I = Sample.getCallTargets().begin(),
E = Sample.getCallTargets().end();
I != E; ++I)
OS << " " << (*I).first << ":" << (*I).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(const Function &F,
const FunctionSamples &S) {
if (S.empty())
return true;
OS << F.getName();
encodeULEB128(0, OS);
encodeULEB128(S.getTotalSamples(), OS);
encodeULEB128(S.getHeadSamples(), OS);
encodeULEB128(S.getBodySamples().size(), OS);
for (BodySampleMap::const_iterator I = S.getBodySamples().begin(),
E = S.getBodySamples().end();
I != E; ++I) {
LineLocation Loc = I->first;
SampleRecord Sample = I->second;
encodeULEB128(Loc.LineOffset, OS);
encodeULEB128(Loc.Discriminator, OS);
encodeULEB128(Sample.getSamples(), OS);
encodeULEB128(Sample.getCallTargets().size(), OS);
for (SampleRecord::CallTargetList::const_iterator
I = Sample.getCallTargets().begin(),
E = Sample.getCallTargets().end();
I != E; ++I) {
std::string Callee = (*I).first;
unsigned CalleeSamples = (*I).second;
OS << Callee;
encodeULEB128(0, OS);
encodeULEB128(CalleeSamples, OS);
}
}
return true;
}
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