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llvm-project/llvm/lib/ProfileData/SampleProfWriter.cpp

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//===- SampleProfWriter.cpp - Write LLVM sample profile data --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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/ADT/StringRef.h"
#include "llvm/ProfileData/ProfileCommon.h"
#include "llvm/ProfileData/SampleProf.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/EndianStream.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstdint>
#include <memory>
#include <set>
#include <system_error>
#include <utility>
#include <vector>
using namespace llvm;
using namespace sampleprof;
std::error_code
SampleProfileWriter::writeFuncProfiles(const SampleProfileMap &ProfileMap) {
std::vector<NameFunctionSamples> V;
sortFuncProfiles(ProfileMap, V);
for (const auto &I : V) {
if (std::error_code EC = writeSample(*I.second))
return EC;
}
return sampleprof_error::success;
}
std::error_code SampleProfileWriter::write(const SampleProfileMap &ProfileMap) {
if (std::error_code EC = writeHeader(ProfileMap))
return EC;
if (std::error_code EC = writeFuncProfiles(ProfileMap))
return EC;
return sampleprof_error::success;
}
/// Return the current position and prepare to use it as the start
/// position of a section given the section type \p Type and its position
/// \p LayoutIdx in SectionHdrLayout.
uint64_t
SampleProfileWriterExtBinaryBase::markSectionStart(SecType Type,
uint32_t LayoutIdx) {
uint64_t SectionStart = OutputStream->tell();
assert(LayoutIdx < SectionHdrLayout.size() && "LayoutIdx out of range");
const auto &Entry = SectionHdrLayout[LayoutIdx];
assert(Entry.Type == Type && "Unexpected section type");
// Use LocalBuf as a temporary output for writting data.
if (hasSecFlag(Entry, SecCommonFlags::SecFlagCompress))
LocalBufStream.swap(OutputStream);
return SectionStart;
}
std::error_code SampleProfileWriterExtBinaryBase::compressAndOutput() {
if (!llvm::zlib::isAvailable())
return sampleprof_error::zlib_unavailable;
std::string &UncompressedStrings =
static_cast<raw_string_ostream *>(LocalBufStream.get())->str();
if (UncompressedStrings.size() == 0)
return sampleprof_error::success;
auto &OS = *OutputStream;
SmallString<128> CompressedStrings;
zlib::compress(UncompressedStrings, CompressedStrings,
zlib::BestSizeCompression);
encodeULEB128(UncompressedStrings.size(), OS);
encodeULEB128(CompressedStrings.size(), OS);
OS << CompressedStrings.str();
UncompressedStrings.clear();
return sampleprof_error::success;
}
/// Add a new section into section header table given the section type
/// \p Type, its position \p LayoutIdx in SectionHdrLayout and the
/// location \p SectionStart where the section should be written to.
std::error_code SampleProfileWriterExtBinaryBase::addNewSection(
SecType Type, uint32_t LayoutIdx, uint64_t SectionStart) {
assert(LayoutIdx < SectionHdrLayout.size() && "LayoutIdx out of range");
const auto &Entry = SectionHdrLayout[LayoutIdx];
assert(Entry.Type == Type && "Unexpected section type");
if (hasSecFlag(Entry, SecCommonFlags::SecFlagCompress)) {
LocalBufStream.swap(OutputStream);
if (std::error_code EC = compressAndOutput())
return EC;
}
SecHdrTable.push_back({Type, Entry.Flags, SectionStart - FileStart,
OutputStream->tell() - SectionStart, LayoutIdx});
return sampleprof_error::success;
}
std::error_code
SampleProfileWriterExtBinaryBase::write(const SampleProfileMap &ProfileMap) {
if (std::error_code EC = writeHeader(ProfileMap))
return EC;
std::string LocalBuf;
LocalBufStream = std::make_unique<raw_string_ostream>(LocalBuf);
if (std::error_code EC = writeSections(ProfileMap))
return EC;
if (std::error_code EC = writeSecHdrTable())
return EC;
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinaryBase::writeContextIdx(
const SampleContext &Context) {
if (Context.hasContext())
return writeCSNameIdx(Context);
else
return SampleProfileWriterBinary::writeNameIdx(Context.getName());
}
std::error_code
SampleProfileWriterExtBinaryBase::writeCSNameIdx(const SampleContext &Context) {
const auto &Ret = CSNameTable.find(Context);
if (Ret == CSNameTable.end())
return sampleprof_error::truncated_name_table;
encodeULEB128(Ret->second, *OutputStream);
return sampleprof_error::success;
}
std::error_code
SampleProfileWriterExtBinaryBase::writeSample(const FunctionSamples &S) {
uint64_t Offset = OutputStream->tell();
auto &Context = S.getContext();
FuncOffsetTable[Context] = Offset - SecLBRProfileStart;
encodeULEB128(S.getHeadSamples(), *OutputStream);
return writeBody(S);
}
std::error_code SampleProfileWriterExtBinaryBase::writeFuncOffsetTable() {
auto &OS = *OutputStream;
// Write out the table size.
encodeULEB128(FuncOffsetTable.size(), OS);
// Write out FuncOffsetTable.
auto WriteItem = [&](const SampleContext &Context, uint64_t Offset) {
if (std::error_code EC = writeContextIdx(Context))
return EC;
encodeULEB128(Offset, OS);
return (std::error_code)sampleprof_error::success;
};
if (FunctionSamples::ProfileIsCS) {
// Sort the contexts before writing them out. This is to help fast load all
// context profiles for a function as well as their callee contexts which
// can help profile-guided importing for ThinLTO.
std::map<SampleContext, uint64_t> OrderedFuncOffsetTable(
FuncOffsetTable.begin(), FuncOffsetTable.end());
for (const auto &Entry : OrderedFuncOffsetTable) {
if (std::error_code EC = WriteItem(Entry.first, Entry.second))
return EC;
}
addSectionFlag(SecFuncOffsetTable, SecFuncOffsetFlags::SecFlagOrdered);
} else {
for (const auto &Entry : FuncOffsetTable) {
if (std::error_code EC = WriteItem(Entry.first, Entry.second))
return EC;
}
}
FuncOffsetTable.clear();
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinaryBase::writeFuncMetadata(
const FunctionSamples &FunctionProfile) {
auto &OS = *OutputStream;
if (std::error_code EC = writeContextIdx(FunctionProfile.getContext()))
return EC;
if (FunctionSamples::ProfileIsProbeBased)
encodeULEB128(FunctionProfile.getFunctionHash(), OS);
if (FunctionSamples::ProfileIsCS || FunctionSamples::ProfileIsPreInlined) {
encodeULEB128(FunctionProfile.getContext().getAllAttributes(), OS);
}
if (!FunctionSamples::ProfileIsCS) {
// Recursively emit attributes for all callee samples.
uint64_t NumCallsites = 0;
for (const auto &J : FunctionProfile.getCallsiteSamples())
NumCallsites += J.second.size();
encodeULEB128(NumCallsites, OS);
for (const auto &J : FunctionProfile.getCallsiteSamples()) {
for (const auto &FS : J.second) {
LineLocation Loc = J.first;
encodeULEB128(Loc.LineOffset, OS);
encodeULEB128(Loc.Discriminator, OS);
if (std::error_code EC = writeFuncMetadata(FS.second))
return EC;
}
}
}
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinaryBase::writeFuncMetadata(
const SampleProfileMap &Profiles) {
if (!FunctionSamples::ProfileIsProbeBased && !FunctionSamples::ProfileIsCS &&
!FunctionSamples::ProfileIsPreInlined)
return sampleprof_error::success;
for (const auto &Entry : Profiles) {
if (std::error_code EC = writeFuncMetadata(Entry.second))
return EC;
}
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinaryBase::writeNameTable() {
if (!UseMD5)
return SampleProfileWriterBinary::writeNameTable();
auto &OS = *OutputStream;
std::set<StringRef> V;
stablizeNameTable(NameTable, V);
// Write out the MD5 name table. We wrote unencoded MD5 so reader can
// retrieve the name using the name index without having to read the
// whole name table.
encodeULEB128(NameTable.size(), OS);
support::endian::Writer Writer(OS, support::little);
for (auto N : V)
Writer.write(MD5Hash(N));
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinaryBase::writeNameTableSection(
const SampleProfileMap &ProfileMap) {
for (const auto &I : ProfileMap) {
assert(I.first == I.second.getContext() && "Inconsistent profile map");
addContext(I.second.getContext());
addNames(I.second);
}
// If NameTable contains ".__uniq." suffix, set SecFlagUniqSuffix flag
// so compiler won't strip the suffix during profile matching after
// seeing the flag in the profile.
for (const auto &I : NameTable) {
if (I.first.contains(FunctionSamples::UniqSuffix)) {
addSectionFlag(SecNameTable, SecNameTableFlags::SecFlagUniqSuffix);
break;
}
}
if (auto EC = writeNameTable())
return EC;
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinaryBase::writeCSNameTableSection() {
// Sort the names to make CSNameTable deterministic.
std::set<SampleContext> OrderedContexts;
for (const auto &I : CSNameTable)
OrderedContexts.insert(I.first);
assert(OrderedContexts.size() == CSNameTable.size() &&
"Unmatched ordered and unordered contexts");
uint64_t I = 0;
for (auto &Context : OrderedContexts)
CSNameTable[Context] = I++;
auto &OS = *OutputStream;
encodeULEB128(OrderedContexts.size(), OS);
support::endian::Writer Writer(OS, support::little);
for (auto Context : OrderedContexts) {
auto Frames = Context.getContextFrames();
encodeULEB128(Frames.size(), OS);
for (auto &Callsite : Frames) {
if (std::error_code EC = writeNameIdx(Callsite.FuncName))
return EC;
encodeULEB128(Callsite.Location.LineOffset, OS);
encodeULEB128(Callsite.Location.Discriminator, OS);
}
}
return sampleprof_error::success;
}
std::error_code
SampleProfileWriterExtBinaryBase::writeProfileSymbolListSection() {
if (ProfSymList && ProfSymList->size() > 0)
if (std::error_code EC = ProfSymList->write(*OutputStream))
return EC;
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinaryBase::writeOneSection(
SecType Type, uint32_t LayoutIdx, const SampleProfileMap &ProfileMap) {
// The setting of SecFlagCompress should happen before markSectionStart.
if (Type == SecProfileSymbolList && ProfSymList && ProfSymList->toCompress())
setToCompressSection(SecProfileSymbolList);
if (Type == SecFuncMetadata && FunctionSamples::ProfileIsProbeBased)
addSectionFlag(SecFuncMetadata, SecFuncMetadataFlags::SecFlagIsProbeBased);
if (Type == SecFuncMetadata &&
(FunctionSamples::ProfileIsCS || FunctionSamples::ProfileIsPreInlined))
addSectionFlag(SecFuncMetadata, SecFuncMetadataFlags::SecFlagHasAttribute);
if (Type == SecProfSummary && FunctionSamples::ProfileIsCS)
addSectionFlag(SecProfSummary, SecProfSummaryFlags::SecFlagFullContext);
if (Type == SecProfSummary && FunctionSamples::ProfileIsPreInlined)
addSectionFlag(SecProfSummary, SecProfSummaryFlags::SecFlagIsPreInlined);
if (Type == SecProfSummary && FunctionSamples::ProfileIsFS)
addSectionFlag(SecProfSummary, SecProfSummaryFlags::SecFlagFSDiscriminator);
uint64_t SectionStart = markSectionStart(Type, LayoutIdx);
switch (Type) {
case SecProfSummary:
computeSummary(ProfileMap);
if (auto EC = writeSummary())
return EC;
break;
case SecNameTable:
if (auto EC = writeNameTableSection(ProfileMap))
return EC;
break;
case SecCSNameTable:
if (auto EC = writeCSNameTableSection())
return EC;
break;
case SecLBRProfile:
SecLBRProfileStart = OutputStream->tell();
if (std::error_code EC = writeFuncProfiles(ProfileMap))
return EC;
break;
case SecFuncOffsetTable:
if (auto EC = writeFuncOffsetTable())
return EC;
break;
case SecFuncMetadata:
if (std::error_code EC = writeFuncMetadata(ProfileMap))
return EC;
break;
case SecProfileSymbolList:
if (auto EC = writeProfileSymbolListSection())
return EC;
break;
default:
if (auto EC = writeCustomSection(Type))
return EC;
break;
}
if (std::error_code EC = addNewSection(Type, LayoutIdx, SectionStart))
return EC;
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinary::writeDefaultLayout(
const SampleProfileMap &ProfileMap) {
// The const indices passed to writeOneSection below are specifying the
// positions of the sections in SectionHdrLayout. Look at
// initSectionHdrLayout to find out where each section is located in
// SectionHdrLayout.
if (auto EC = writeOneSection(SecProfSummary, 0, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecNameTable, 1, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecCSNameTable, 2, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecLBRProfile, 4, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecProfileSymbolList, 5, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecFuncOffsetTable, 3, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecFuncMetadata, 6, ProfileMap))
return EC;
return sampleprof_error::success;
}
static void splitProfileMapToTwo(const SampleProfileMap &ProfileMap,
SampleProfileMap &ContextProfileMap,
SampleProfileMap &NoContextProfileMap) {
for (const auto &I : ProfileMap) {
if (I.second.getCallsiteSamples().size())
ContextProfileMap.insert({I.first, I.second});
else
NoContextProfileMap.insert({I.first, I.second});
}
}
std::error_code SampleProfileWriterExtBinary::writeCtxSplitLayout(
const SampleProfileMap &ProfileMap) {
SampleProfileMap ContextProfileMap, NoContextProfileMap;
splitProfileMapToTwo(ProfileMap, ContextProfileMap, NoContextProfileMap);
if (auto EC = writeOneSection(SecProfSummary, 0, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecNameTable, 1, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecLBRProfile, 3, ContextProfileMap))
return EC;
if (auto EC = writeOneSection(SecFuncOffsetTable, 2, ContextProfileMap))
return EC;
// Mark the section to have no context. Note section flag needs to be set
// before writing the section.
addSectionFlag(5, SecCommonFlags::SecFlagFlat);
if (auto EC = writeOneSection(SecLBRProfile, 5, NoContextProfileMap))
return EC;
// Mark the section to have no context. Note section flag needs to be set
// before writing the section.
addSectionFlag(4, SecCommonFlags::SecFlagFlat);
if (auto EC = writeOneSection(SecFuncOffsetTable, 4, NoContextProfileMap))
return EC;
if (auto EC = writeOneSection(SecProfileSymbolList, 6, ProfileMap))
return EC;
if (auto EC = writeOneSection(SecFuncMetadata, 7, ProfileMap))
return EC;
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinary::writeSections(
const SampleProfileMap &ProfileMap) {
std::error_code EC;
if (SecLayout == DefaultLayout)
EC = writeDefaultLayout(ProfileMap);
else if (SecLayout == CtxSplitLayout)
EC = writeCtxSplitLayout(ProfileMap);
else
llvm_unreachable("Unsupported layout");
return EC;
}
std::error_code
SampleProfileWriterCompactBinary::write(const SampleProfileMap &ProfileMap) {
if (std::error_code EC = SampleProfileWriter::write(ProfileMap))
return EC;
if (std::error_code EC = writeFuncOffsetTable())
return EC;
return sampleprof_error::success;
}
/// Write samples to a text file.
///
/// Note: it may be tempting to implement this in terms of
/// FunctionSamples::print(). Please don't. The dump functionality is intended
/// for debugging and has no specified form.
///
/// The format used here is more structured and deliberate because
/// it needs to be parsed by the SampleProfileReaderText class.
std::error_code SampleProfileWriterText::writeSample(const FunctionSamples &S) {
auto &OS = *OutputStream;
if (FunctionSamples::ProfileIsCS)
OS << "[" << S.getContext().toString() << "]:" << S.getTotalSamples();
else
OS << S.getName() << ":" << S.getTotalSamples();
if (Indent == 0)
OS << ":" << S.getHeadSamples();
OS << "\n";
SampleSorter<LineLocation, SampleRecord> SortedSamples(S.getBodySamples());
for (const auto &I : SortedSamples.get()) {
LineLocation Loc = I->first;
const SampleRecord &Sample = I->second;
OS.indent(Indent + 1);
if (Loc.Discriminator == 0)
OS << Loc.LineOffset << ": ";
else
OS << Loc.LineOffset << "." << Loc.Discriminator << ": ";
OS << Sample.getSamples();
for (const auto &J : Sample.getSortedCallTargets())
OS << " " << J.first << ":" << J.second;
OS << "\n";
}
SampleSorter<LineLocation, FunctionSamplesMap> SortedCallsiteSamples(
S.getCallsiteSamples());
Indent += 1;
for (const auto &I : SortedCallsiteSamples.get())
for (const auto &FS : I->second) {
LineLocation Loc = I->first;
const FunctionSamples &CalleeSamples = FS.second;
OS.indent(Indent);
if (Loc.Discriminator == 0)
OS << Loc.LineOffset << ": ";
else
OS << Loc.LineOffset << "." << Loc.Discriminator << ": ";
if (std::error_code EC = writeSample(CalleeSamples))
return EC;
}
Indent -= 1;
if (FunctionSamples::ProfileIsProbeBased) {
OS.indent(Indent + 1);
OS << "!CFGChecksum: " << S.getFunctionHash() << "\n";
}
if (S.getContext().getAllAttributes()) {
OS.indent(Indent + 1);
OS << "!Attributes: " << S.getContext().getAllAttributes() << "\n";
}
return sampleprof_error::success;
}
std::error_code
SampleProfileWriterBinary::writeContextIdx(const SampleContext &Context) {
assert(!Context.hasContext() && "cs profile is not supported");
return writeNameIdx(Context.getName());
}
std::error_code SampleProfileWriterBinary::writeNameIdx(StringRef FName) {
auto &NTable = getNameTable();
const auto &Ret = NTable.find(FName);
if (Ret == NTable.end())
return sampleprof_error::truncated_name_table;
encodeULEB128(Ret->second, *OutputStream);
return sampleprof_error::success;
}
void SampleProfileWriterBinary::addName(StringRef FName) {
auto &NTable = getNameTable();
NTable.insert(std::make_pair(FName, 0));
}
void SampleProfileWriterBinary::addContext(const SampleContext &Context) {
addName(Context.getName());
}
void SampleProfileWriterBinary::addNames(const FunctionSamples &S) {
// Add all the names in indirect call targets.
for (const auto &I : S.getBodySamples()) {
const SampleRecord &Sample = I.second;
for (const auto &J : Sample.getCallTargets())
addName(J.first());
}
// Recursively add all the names for inlined callsites.
for (const auto &J : S.getCallsiteSamples())
for (const auto &FS : J.second) {
const FunctionSamples &CalleeSamples = FS.second;
addName(CalleeSamples.getName());
addNames(CalleeSamples);
}
}
void SampleProfileWriterExtBinaryBase::addContext(
const SampleContext &Context) {
if (Context.hasContext()) {
for (auto &Callsite : Context.getContextFrames())
SampleProfileWriterBinary::addName(Callsite.FuncName);
CSNameTable.insert(std::make_pair(Context, 0));
} else {
SampleProfileWriterBinary::addName(Context.getName());
}
}
void SampleProfileWriterBinary::stablizeNameTable(
MapVector<StringRef, uint32_t> &NameTable, std::set<StringRef> &V) {
// Sort the names to make NameTable deterministic.
for (const auto &I : NameTable)
V.insert(I.first);
int i = 0;
for (const StringRef &N : V)
NameTable[N] = i++;
}
std::error_code SampleProfileWriterBinary::writeNameTable() {
auto &OS = *OutputStream;
std::set<StringRef> V;
stablizeNameTable(NameTable, V);
// Write out the name table.
encodeULEB128(NameTable.size(), OS);
for (auto N : V) {
OS << N;
encodeULEB128(0, OS);
}
return sampleprof_error::success;
}
std::error_code SampleProfileWriterCompactBinary::writeFuncOffsetTable() {
auto &OS = *OutputStream;
// Fill the slot remembered by TableOffset with the offset of FuncOffsetTable.
auto &OFS = static_cast<raw_fd_ostream &>(OS);
uint64_t FuncOffsetTableStart = OS.tell();
if (OFS.seek(TableOffset) == (uint64_t)-1)
return sampleprof_error::ostream_seek_unsupported;
support::endian::Writer Writer(*OutputStream, support::little);
Writer.write(FuncOffsetTableStart);
if (OFS.seek(FuncOffsetTableStart) == (uint64_t)-1)
return sampleprof_error::ostream_seek_unsupported;
// Write out the table size.
encodeULEB128(FuncOffsetTable.size(), OS);
// Write out FuncOffsetTable.
for (auto Entry : FuncOffsetTable) {
if (std::error_code EC = writeNameIdx(Entry.first))
return EC;
encodeULEB128(Entry.second, OS);
}
return sampleprof_error::success;
}
std::error_code SampleProfileWriterCompactBinary::writeNameTable() {
auto &OS = *OutputStream;
std::set<StringRef> V;
stablizeNameTable(NameTable, V);
// Write out the name table.
encodeULEB128(NameTable.size(), OS);
for (auto N : V) {
encodeULEB128(MD5Hash(N), OS);
}
return sampleprof_error::success;
}
std::error_code
SampleProfileWriterBinary::writeMagicIdent(SampleProfileFormat Format) {
auto &OS = *OutputStream;
// Write file magic identifier.
encodeULEB128(SPMagic(Format), OS);
encodeULEB128(SPVersion(), OS);
return sampleprof_error::success;
}
std::error_code
SampleProfileWriterBinary::writeHeader(const SampleProfileMap &ProfileMap) {
writeMagicIdent(Format);
computeSummary(ProfileMap);
if (auto EC = writeSummary())
return EC;
// Generate the name table for all the functions referenced in the profile.
for (const auto &I : ProfileMap) {
assert(I.first == I.second.getContext() && "Inconsistent profile map");
addContext(I.first);
addNames(I.second);
}
writeNameTable();
return sampleprof_error::success;
}
void SampleProfileWriterExtBinaryBase::setToCompressAllSections() {
for (auto &Entry : SectionHdrLayout)
addSecFlag(Entry, SecCommonFlags::SecFlagCompress);
}
void SampleProfileWriterExtBinaryBase::setToCompressSection(SecType Type) {
addSectionFlag(Type, SecCommonFlags::SecFlagCompress);
}
void SampleProfileWriterExtBinaryBase::allocSecHdrTable() {
support::endian::Writer Writer(*OutputStream, support::little);
Writer.write(static_cast<uint64_t>(SectionHdrLayout.size()));
SecHdrTableOffset = OutputStream->tell();
for (uint32_t i = 0; i < SectionHdrLayout.size(); i++) {
Writer.write(static_cast<uint64_t>(-1));
Writer.write(static_cast<uint64_t>(-1));
Writer.write(static_cast<uint64_t>(-1));
Writer.write(static_cast<uint64_t>(-1));
}
}
std::error_code SampleProfileWriterExtBinaryBase::writeSecHdrTable() {
auto &OFS = static_cast<raw_fd_ostream &>(*OutputStream);
uint64_t Saved = OutputStream->tell();
// Set OutputStream to the location saved in SecHdrTableOffset.
if (OFS.seek(SecHdrTableOffset) == (uint64_t)-1)
return sampleprof_error::ostream_seek_unsupported;
support::endian::Writer Writer(*OutputStream, support::little);
assert(SecHdrTable.size() == SectionHdrLayout.size() &&
"SecHdrTable entries doesn't match SectionHdrLayout");
SmallVector<uint32_t, 16> IndexMap(SecHdrTable.size(), -1);
for (uint32_t TableIdx = 0; TableIdx < SecHdrTable.size(); TableIdx++) {
IndexMap[SecHdrTable[TableIdx].LayoutIndex] = TableIdx;
}
// Write the section header table in the order specified in
// SectionHdrLayout. SectionHdrLayout specifies the sections
// order in which profile reader expect to read, so the section
// header table should be written in the order in SectionHdrLayout.
// Note that the section order in SecHdrTable may be different
// from the order in SectionHdrLayout, for example, SecFuncOffsetTable
// needs to be computed after SecLBRProfile (the order in SecHdrTable),
// but it needs to be read before SecLBRProfile (the order in
// SectionHdrLayout). So we use IndexMap above to switch the order.
for (uint32_t LayoutIdx = 0; LayoutIdx < SectionHdrLayout.size();
LayoutIdx++) {
assert(IndexMap[LayoutIdx] < SecHdrTable.size() &&
"Incorrect LayoutIdx in SecHdrTable");
auto Entry = SecHdrTable[IndexMap[LayoutIdx]];
Writer.write(static_cast<uint64_t>(Entry.Type));
Writer.write(static_cast<uint64_t>(Entry.Flags));
Writer.write(static_cast<uint64_t>(Entry.Offset));
Writer.write(static_cast<uint64_t>(Entry.Size));
}
// Reset OutputStream.
if (OFS.seek(Saved) == (uint64_t)-1)
return sampleprof_error::ostream_seek_unsupported;
return sampleprof_error::success;
}
std::error_code SampleProfileWriterExtBinaryBase::writeHeader(
const SampleProfileMap &ProfileMap) {
auto &OS = *OutputStream;
FileStart = OS.tell();
writeMagicIdent(Format);
allocSecHdrTable();
return sampleprof_error::success;
}
std::error_code SampleProfileWriterCompactBinary::writeHeader(
const SampleProfileMap &ProfileMap) {
support::endian::Writer Writer(*OutputStream, support::little);
if (auto EC = SampleProfileWriterBinary::writeHeader(ProfileMap))
return EC;
// Reserve a slot for the offset of function offset table. The slot will
// be populated with the offset of FuncOffsetTable later.
TableOffset = OutputStream->tell();
Writer.write(static_cast<uint64_t>(-2));
return sampleprof_error::success;
}
std::error_code SampleProfileWriterBinary::writeSummary() {
auto &OS = *OutputStream;
encodeULEB128(Summary->getTotalCount(), OS);
encodeULEB128(Summary->getMaxCount(), OS);
encodeULEB128(Summary->getMaxFunctionCount(), OS);
encodeULEB128(Summary->getNumCounts(), OS);
encodeULEB128(Summary->getNumFunctions(), OS);
const std::vector<ProfileSummaryEntry> &Entries =
Summary->getDetailedSummary();
encodeULEB128(Entries.size(), OS);
for (auto Entry : Entries) {
encodeULEB128(Entry.Cutoff, OS);
encodeULEB128(Entry.MinCount, OS);
encodeULEB128(Entry.NumCounts, OS);
}
return sampleprof_error::success;
}
std::error_code SampleProfileWriterBinary::writeBody(const FunctionSamples &S) {
auto &OS = *OutputStream;
if (std::error_code EC = writeContextIdx(S.getContext()))
return EC;
encodeULEB128(S.getTotalSamples(), OS);
// Emit all the body samples.
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.getSortedCallTargets()) {
StringRef Callee = J.first;
uint64_t CalleeSamples = J.second;
if (std::error_code EC = writeNameIdx(Callee))
return EC;
encodeULEB128(CalleeSamples, OS);
}
}
// Recursively emit all the callsite samples.
uint64_t NumCallsites = 0;
for (const auto &J : S.getCallsiteSamples())
NumCallsites += J.second.size();
encodeULEB128(NumCallsites, OS);
for (const auto &J : S.getCallsiteSamples())
for (const auto &FS : J.second) {
LineLocation Loc = J.first;
const FunctionSamples &CalleeSamples = FS.second;
encodeULEB128(Loc.LineOffset, OS);
encodeULEB128(Loc.Discriminator, OS);
if (std::error_code EC = writeBody(CalleeSamples))
return EC;
}
return sampleprof_error::success;
}
/// Write samples of a top-level function to a binary file.
///
/// \returns true if the samples were written successfully, false otherwise.
std::error_code
SampleProfileWriterBinary::writeSample(const FunctionSamples &S) {
encodeULEB128(S.getHeadSamples(), *OutputStream);
return writeBody(S);
}
std::error_code
SampleProfileWriterCompactBinary::writeSample(const FunctionSamples &S) {
uint64_t Offset = OutputStream->tell();
StringRef Name = S.getName();
FuncOffsetTable[Name] = Offset;
encodeULEB128(S.getHeadSamples(), *OutputStream);
return writeBody(S);
}
/// Create a sample profile file writer based on the specified format.
///
/// \param Filename The file to create.
///
/// \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<raw_ostream> OS;
if (Format == SPF_Binary || Format == SPF_Ext_Binary ||
Format == SPF_Compact_Binary)
OS.reset(new raw_fd_ostream(Filename, EC, sys::fs::OF_None));
else
OS.reset(new raw_fd_ostream(Filename, EC, sys::fs::OF_TextWithCRLF));
if (EC)
return EC;
return create(OS, Format);
}
/// Create a sample profile stream writer based on the specified format.
///
/// \param OS The output stream to store the profile data to.
///
/// \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(std::unique_ptr<raw_ostream> &OS,
SampleProfileFormat Format) {
std::error_code EC;
std::unique_ptr<SampleProfileWriter> Writer;
// Currently only Text and Extended Binary format are supported for CSSPGO.
if ((FunctionSamples::ProfileIsCS || FunctionSamples::ProfileIsProbeBased) &&
(Format == SPF_Binary || Format == SPF_Compact_Binary))
return sampleprof_error::unsupported_writing_format;
if (Format == SPF_Binary)
Writer.reset(new SampleProfileWriterRawBinary(OS));
else if (Format == SPF_Ext_Binary)
Writer.reset(new SampleProfileWriterExtBinary(OS));
else if (Format == SPF_Compact_Binary)
Writer.reset(new SampleProfileWriterCompactBinary(OS));
else if (Format == SPF_Text)
Writer.reset(new SampleProfileWriterText(OS));
else if (Format == SPF_GCC)
EC = sampleprof_error::unsupported_writing_format;
else
EC = sampleprof_error::unrecognized_format;
if (EC)
return EC;
Writer->Format = Format;
return std::move(Writer);
}
void SampleProfileWriter::computeSummary(const SampleProfileMap &ProfileMap) {
SampleProfileSummaryBuilder Builder(ProfileSummaryBuilder::DefaultCutoffs);
Summary = Builder.computeSummaryForProfiles(ProfileMap);
}
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