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e75c2b3e54
Summary: This patch finishes up support for handling sampling profiles in both text and binary formats. The new binary format uses uleb128 encoding to represent numeric values. This makes profiles files about 25% smaller. The profile writer class can write profiles in the existing text and the new binary format. In subsequent patches, I will add the capability to read (and perhaps write) profiles in the gcov format used by GCC. Additionally, I will be adding support in llvm-profdata to manipulate sampling profiles. There was a bit of refactoring needed to separate some code that was in the reader files, but is actually common to both the reader and writer. The new test checks that reading the same profile encoded as text or raw, produces the same results. Reviewers: bogner, dexonsmith Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D6000 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220915 91177308-0d34-0410-b5e6-96231b3b80d8
111 lines
3.6 KiB
C++
111 lines
3.6 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(const Function &F,
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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 << F.getName() << ":" << S.getTotalSamples() << ":" << S.getHeadSamples()
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<< "\n";
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for (BodySampleMap::const_iterator I = S.getBodySamples().begin(),
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E = S.getBodySamples().end();
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I != E; ++I) {
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LineLocation Loc = I->first;
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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 (SampleRecord::CallTargetList::const_iterator
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I = Sample.getCallTargets().begin(),
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E = Sample.getCallTargets().end();
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I != E; ++I)
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OS << " " << (*I).first << ":" << (*I).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(const Function &F,
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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 << F.getName();
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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 (BodySampleMap::const_iterator I = S.getBodySamples().begin(),
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E = S.getBodySamples().end();
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I != E; ++I) {
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LineLocation Loc = I->first;
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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 (SampleRecord::CallTargetList::const_iterator
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I = Sample.getCallTargets().begin(),
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E = Sample.getCallTargets().end();
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I != E; ++I) {
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std::string Callee = (*I).first;
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unsigned CalleeSamples = (*I).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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