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