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

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//===- SampleProfReader.cpp - Read 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 reads LLVM sample profiles. It
// supports three file formats: text, binary and gcov.
//
// The textual representation is useful for debugging and testing purposes. The
// binary representation is more compact, resulting in smaller file sizes.
//
// The gcov encoding is the one generated by GCC's AutoFDO profile creation
// tool (https://github.com/google/autofdo)
//
// All three encodings can be used interchangeably as an input sample profile.
//
//===----------------------------------------------------------------------===//
#include "llvm/ProfileData/SampleProfReader.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/ProfileSummary.h"
#include "llvm/ProfileData/ProfileCommon.h"
#include "llvm/ProfileData/SampleProf.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <limits>
#include <memory>
#include <system_error>
#include <vector>
using namespace llvm;
using namespace sampleprof;
/// Dump the function profile for \p FName.
///
/// \param FName Name of the function to print.
/// \param OS Stream to emit the output to.
void SampleProfileReader::dumpFunctionProfile(StringRef FName,
raw_ostream &OS) {
OS << "Function: " << FName << ": " << Profiles[FName];
}
/// Dump all the function profiles found on stream \p OS.
void SampleProfileReader::dump(raw_ostream &OS) {
for (const auto &I : Profiles)
dumpFunctionProfile(I.getKey(), OS);
}
/// Parse \p Input as function head.
///
/// Parse one line of \p Input, and update function name in \p FName,
/// function's total sample count in \p NumSamples, function's entry
/// count in \p NumHeadSamples.
///
/// \returns true if parsing is successful.
static bool ParseHead(const StringRef &Input, StringRef &FName,
uint64_t &NumSamples, uint64_t &NumHeadSamples) {
if (Input[0] == ' ')
return false;
size_t n2 = Input.rfind(':');
size_t n1 = Input.rfind(':', n2 - 1);
FName = Input.substr(0, n1);
if (Input.substr(n1 + 1, n2 - n1 - 1).getAsInteger(10, NumSamples))
return false;
if (Input.substr(n2 + 1).getAsInteger(10, NumHeadSamples))
return false;
return true;
}
/// Returns true if line offset \p L is legal (only has 16 bits).
static bool isOffsetLegal(unsigned L) { return (L & 0xffff) == L; }
/// Parse \p Input as line sample.
///
/// \param Input input line.
/// \param IsCallsite true if the line represents an inlined callsite.
/// \param Depth the depth of the inline stack.
/// \param NumSamples total samples of the line/inlined callsite.
/// \param LineOffset line offset to the start of the function.
/// \param Discriminator discriminator of the line.
/// \param TargetCountMap map from indirect call target to count.
///
/// returns true if parsing is successful.
static bool ParseLine(const StringRef &Input, bool &IsCallsite, uint32_t &Depth,
uint64_t &NumSamples, uint32_t &LineOffset,
uint32_t &Discriminator, StringRef &CalleeName,
DenseMap<StringRef, uint64_t> &TargetCountMap) {
for (Depth = 0; Input[Depth] == ' '; Depth++)
;
if (Depth == 0)
return false;
size_t n1 = Input.find(':');
StringRef Loc = Input.substr(Depth, n1 - Depth);
size_t n2 = Loc.find('.');
if (n2 == StringRef::npos) {
if (Loc.getAsInteger(10, LineOffset) || !isOffsetLegal(LineOffset))
return false;
Discriminator = 0;
} else {
if (Loc.substr(0, n2).getAsInteger(10, LineOffset))
return false;
if (Loc.substr(n2 + 1).getAsInteger(10, Discriminator))
return false;
}
StringRef Rest = Input.substr(n1 + 2);
if (Rest[0] >= '0' && Rest[0] <= '9') {
IsCallsite = false;
size_t n3 = Rest.find(' ');
if (n3 == StringRef::npos) {
if (Rest.getAsInteger(10, NumSamples))
return false;
} else {
if (Rest.substr(0, n3).getAsInteger(10, NumSamples))
return false;
}
// Find call targets and their sample counts.
// Note: In some cases, there are symbols in the profile which are not
// mangled. To accommodate such cases, use colon + integer pairs as the
// anchor points.
// An example:
// _M_construct<char *>:1000 string_view<std::allocator<char> >:437
// ":1000" and ":437" are used as anchor points so the string above will
// be interpreted as
// target: _M_construct<char *>
// count: 1000
// target: string_view<std::allocator<char> >
// count: 437
while (n3 != StringRef::npos) {
n3 += Rest.substr(n3).find_first_not_of(' ');
Rest = Rest.substr(n3);
n3 = Rest.find_first_of(':');
if (n3 == StringRef::npos || n3 == 0)
return false;
StringRef Target;
uint64_t count, n4;
while (true) {
// Get the segment after the current colon.
StringRef AfterColon = Rest.substr(n3 + 1);
// Get the target symbol before the current colon.
Target = Rest.substr(0, n3);
// Check if the word after the current colon is an integer.
n4 = AfterColon.find_first_of(' ');
n4 = (n4 != StringRef::npos) ? n3 + n4 + 1 : Rest.size();
StringRef WordAfterColon = Rest.substr(n3 + 1, n4 - n3 - 1);
if (!WordAfterColon.getAsInteger(10, count))
break;
// Try to find the next colon.
uint64_t n5 = AfterColon.find_first_of(':');
if (n5 == StringRef::npos)
return false;
n3 += n5 + 1;
}
// An anchor point is found. Save the {target, count} pair
TargetCountMap[Target] = count;
if (n4 == Rest.size())
break;
// Change n3 to the next blank space after colon + integer pair.
n3 = n4;
}
} else {
IsCallsite = true;
size_t n3 = Rest.find_last_of(':');
CalleeName = Rest.substr(0, n3);
if (Rest.substr(n3 + 1).getAsInteger(10, NumSamples))
return false;
}
return true;
}
/// Load samples from a text file.
///
/// See the documentation at the top of the file for an explanation of
/// the expected format.
///
/// \returns true if the file was loaded successfully, false otherwise.
std::error_code SampleProfileReaderText::read() {
line_iterator LineIt(*Buffer, /*SkipBlanks=*/true, '#');
sampleprof_error Result = sampleprof_error::success;
InlineCallStack InlineStack;
for (; !LineIt.is_at_eof(); ++LineIt) {
if ((*LineIt)[(*LineIt).find_first_not_of(' ')] == '#')
continue;
// Read the header of each function.
//
// Note that for function identifiers we are actually expecting
// mangled names, but we may not always get them. This happens when
// the compiler decides not to emit the function (e.g., it was inlined
// and removed). In this case, the binary will not have the linkage
// name for the function, so the profiler will emit the function's
// unmangled name, which may contain characters like ':' and '>' in its
// name (member functions, templates, etc).
//
// The only requirement we place on the identifier, then, is that it
// should not begin with a number.
if ((*LineIt)[0] != ' ') {
uint64_t NumSamples, NumHeadSamples;
StringRef FName;
if (!ParseHead(*LineIt, FName, NumSamples, NumHeadSamples)) {
reportError(LineIt.line_number(),
"Expected 'mangled_name:NUM:NUM', found " + *LineIt);
return sampleprof_error::malformed;
}
Profiles[FName] = FunctionSamples();
FunctionSamples &FProfile = Profiles[FName];
FProfile.setName(FName);
MergeResult(Result, FProfile.addTotalSamples(NumSamples));
MergeResult(Result, FProfile.addHeadSamples(NumHeadSamples));
InlineStack.clear();
InlineStack.push_back(&FProfile);
} else {
uint64_t NumSamples;
StringRef FName;
DenseMap<StringRef, uint64_t> TargetCountMap;
bool IsCallsite;
uint32_t Depth, LineOffset, Discriminator;
if (!ParseLine(*LineIt, IsCallsite, Depth, NumSamples, LineOffset,
Discriminator, FName, TargetCountMap)) {
reportError(LineIt.line_number(),
"Expected 'NUM[.NUM]: NUM[ mangled_name:NUM]*', found " +
*LineIt);
return sampleprof_error::malformed;
}
if (IsCallsite) {
while (InlineStack.size() > Depth) {
InlineStack.pop_back();
}
FunctionSamples &FSamples = InlineStack.back()->functionSamplesAt(
LineLocation(LineOffset, Discriminator))[FName];
FSamples.setName(FName);
MergeResult(Result, FSamples.addTotalSamples(NumSamples));
InlineStack.push_back(&FSamples);
} else {
while (InlineStack.size() > Depth) {
InlineStack.pop_back();
}
FunctionSamples &FProfile = *InlineStack.back();
for (const auto &name_count : TargetCountMap) {
MergeResult(Result, FProfile.addCalledTargetSamples(
LineOffset, Discriminator, name_count.first,
name_count.second));
}
MergeResult(Result, FProfile.addBodySamples(LineOffset, Discriminator,
NumSamples));
}
}
}
if (Result == sampleprof_error::success)
computeSummary();
return Result;
}
bool SampleProfileReaderText::hasFormat(const MemoryBuffer &Buffer) {
bool result = false;
// Check that the first non-comment line is a valid function header.
line_iterator LineIt(Buffer, /*SkipBlanks=*/true, '#');
if (!LineIt.is_at_eof()) {
if ((*LineIt)[0] != ' ') {
uint64_t NumSamples, NumHeadSamples;
StringRef FName;
result = ParseHead(*LineIt, FName, NumSamples, NumHeadSamples);
}
}
return result;
}
template <typename T> ErrorOr<T> SampleProfileReaderBinary::readNumber() {
unsigned NumBytesRead = 0;
std::error_code EC;
uint64_t Val = decodeULEB128(Data, &NumBytesRead);
if (Val > std::numeric_limits<T>::max())
EC = sampleprof_error::malformed;
else if (Data + NumBytesRead > End)
EC = sampleprof_error::truncated;
else
EC = sampleprof_error::success;
if (EC) {
reportError(0, EC.message());
return EC;
}
Data += NumBytesRead;
return static_cast<T>(Val);
}
ErrorOr<StringRef> SampleProfileReaderBinary::readString() {
std::error_code EC;
StringRef Str(reinterpret_cast<const char *>(Data));
if (Data + Str.size() + 1 > End) {
EC = sampleprof_error::truncated;
reportError(0, EC.message());
return EC;
}
Data += Str.size() + 1;
return Str;
}
template <typename T>
inline ErrorOr<uint32_t> SampleProfileReaderBinary::readStringIndex(T &Table) {
std::error_code EC;
auto Idx = readNumber<uint32_t>();
if (std::error_code EC = Idx.getError())
return EC;
if (*Idx >= Table.size())
return sampleprof_error::truncated_name_table;
return *Idx;
}
ErrorOr<StringRef> SampleProfileReaderRawBinary::readStringFromTable() {
auto Idx = readStringIndex(NameTable);
if (std::error_code EC = Idx.getError())
return EC;
return NameTable[*Idx];
}
ErrorOr<StringRef> SampleProfileReaderCompactBinary::readStringFromTable() {
auto Idx = readStringIndex(NameTable);
if (std::error_code EC = Idx.getError())
return EC;
return StringRef(NameTable[*Idx]);
}
std::error_code
SampleProfileReaderBinary::readProfile(FunctionSamples &FProfile) {
auto NumSamples = readNumber<uint64_t>();
if (std::error_code EC = NumSamples.getError())
return EC;
FProfile.addTotalSamples(*NumSamples);
// Read the samples in the body.
auto NumRecords = readNumber<uint32_t>();
if (std::error_code EC = NumRecords.getError())
return EC;
for (uint32_t I = 0; I < *NumRecords; ++I) {
auto LineOffset = readNumber<uint64_t>();
if (std::error_code EC = LineOffset.getError())
return EC;
if (!isOffsetLegal(*LineOffset)) {
return std::error_code();
}
auto Discriminator = readNumber<uint64_t>();
if (std::error_code EC = Discriminator.getError())
return EC;
auto NumSamples = readNumber<uint64_t>();
if (std::error_code EC = NumSamples.getError())
return EC;
auto NumCalls = readNumber<uint32_t>();
if (std::error_code EC = NumCalls.getError())
return EC;
for (uint32_t J = 0; J < *NumCalls; ++J) {
auto CalledFunction(readStringFromTable());
if (std::error_code EC = CalledFunction.getError())
return EC;
auto CalledFunctionSamples = readNumber<uint64_t>();
if (std::error_code EC = CalledFunctionSamples.getError())
return EC;
FProfile.addCalledTargetSamples(*LineOffset, *Discriminator,
*CalledFunction, *CalledFunctionSamples);
}
FProfile.addBodySamples(*LineOffset, *Discriminator, *NumSamples);
}
// Read all the samples for inlined function calls.
auto NumCallsites = readNumber<uint32_t>();
if (std::error_code EC = NumCallsites.getError())
return EC;
for (uint32_t J = 0; J < *NumCallsites; ++J) {
auto LineOffset = readNumber<uint64_t>();
if (std::error_code EC = LineOffset.getError())
return EC;
auto Discriminator = readNumber<uint64_t>();
if (std::error_code EC = Discriminator.getError())
return EC;
auto FName(readStringFromTable());
if (std::error_code EC = FName.getError())
return EC;
FunctionSamples &CalleeProfile = FProfile.functionSamplesAt(
LineLocation(*LineOffset, *Discriminator))[*FName];
CalleeProfile.setName(*FName);
if (std::error_code EC = readProfile(CalleeProfile))
return EC;
}
return sampleprof_error::success;
}
std::error_code SampleProfileReaderBinary::read() {
while (!at_eof()) {
auto NumHeadSamples = readNumber<uint64_t>();
if (std::error_code EC = NumHeadSamples.getError())
return EC;
auto FName(readStringFromTable());
if (std::error_code EC = FName.getError())
return EC;
Profiles[*FName] = FunctionSamples();
FunctionSamples &FProfile = Profiles[*FName];
FProfile.setName(*FName);
FProfile.addHeadSamples(*NumHeadSamples);
if (std::error_code EC = readProfile(FProfile))
return EC;
}
return sampleprof_error::success;
}
std::error_code SampleProfileReaderRawBinary::verifySPMagic(uint64_t Magic) {
if (Magic == SPMagic())
return sampleprof_error::success;
return sampleprof_error::bad_magic;
}
std::error_code
SampleProfileReaderCompactBinary::verifySPMagic(uint64_t Magic) {
if (Magic == SPMagic(SPF_Compact_Binary))
return sampleprof_error::success;
return sampleprof_error::bad_magic;
}
std::error_code SampleProfileReaderRawBinary::readNameTable() {
auto Size = readNumber<uint32_t>();
if (std::error_code EC = Size.getError())
return EC;
NameTable.reserve(*Size);
for (uint32_t I = 0; I < *Size; ++I) {
auto Name(readString());
if (std::error_code EC = Name.getError())
return EC;
NameTable.push_back(*Name);
}
return sampleprof_error::success;
}
std::error_code SampleProfileReaderCompactBinary::readNameTable() {
auto Size = readNumber<uint64_t>();
if (std::error_code EC = Size.getError())
return EC;
NameTable.reserve(*Size);
for (uint32_t I = 0; I < *Size; ++I) {
auto FID = readNumber<uint64_t>();
if (std::error_code EC = FID.getError())
return EC;
NameTable.push_back(std::to_string(*FID));
}
return sampleprof_error::success;
}
std::error_code SampleProfileReaderBinary::readHeader() {
Data = reinterpret_cast<const uint8_t *>(Buffer->getBufferStart());
End = Data + Buffer->getBufferSize();
// Read and check the magic identifier.
auto Magic = readNumber<uint64_t>();
if (std::error_code EC = Magic.getError())
return EC;
else if (std::error_code EC = verifySPMagic(*Magic))
return EC;
// Read the version number.
auto Version = readNumber<uint64_t>();
if (std::error_code EC = Version.getError())
return EC;
else if (*Version != SPVersion())
return sampleprof_error::unsupported_version;
if (std::error_code EC = readSummary())
return EC;
if (std::error_code EC = readNameTable())
return EC;
return sampleprof_error::success;
}
std::error_code SampleProfileReaderBinary::readSummaryEntry(
std::vector<ProfileSummaryEntry> &Entries) {
auto Cutoff = readNumber<uint64_t>();
if (std::error_code EC = Cutoff.getError())
return EC;
auto MinBlockCount = readNumber<uint64_t>();
if (std::error_code EC = MinBlockCount.getError())
return EC;
auto NumBlocks = readNumber<uint64_t>();
if (std::error_code EC = NumBlocks.getError())
return EC;
Entries.emplace_back(*Cutoff, *MinBlockCount, *NumBlocks);
return sampleprof_error::success;
}
std::error_code SampleProfileReaderBinary::readSummary() {
auto TotalCount = readNumber<uint64_t>();
if (std::error_code EC = TotalCount.getError())
return EC;
auto MaxBlockCount = readNumber<uint64_t>();
if (std::error_code EC = MaxBlockCount.getError())
return EC;
auto MaxFunctionCount = readNumber<uint64_t>();
if (std::error_code EC = MaxFunctionCount.getError())
return EC;
auto NumBlocks = readNumber<uint64_t>();
if (std::error_code EC = NumBlocks.getError())
return EC;
auto NumFunctions = readNumber<uint64_t>();
if (std::error_code EC = NumFunctions.getError())
return EC;
auto NumSummaryEntries = readNumber<uint64_t>();
if (std::error_code EC = NumSummaryEntries.getError())
return EC;
std::vector<ProfileSummaryEntry> Entries;
for (unsigned i = 0; i < *NumSummaryEntries; i++) {
std::error_code EC = readSummaryEntry(Entries);
if (EC != sampleprof_error::success)
return EC;
}
Summary = llvm::make_unique<ProfileSummary>(
ProfileSummary::PSK_Sample, Entries, *TotalCount, *MaxBlockCount, 0,
*MaxFunctionCount, *NumBlocks, *NumFunctions);
return sampleprof_error::success;
}
bool SampleProfileReaderRawBinary::hasFormat(const MemoryBuffer &Buffer) {
const uint8_t *Data =
reinterpret_cast<const uint8_t *>(Buffer.getBufferStart());
uint64_t Magic = decodeULEB128(Data);
return Magic == SPMagic();
}
bool SampleProfileReaderCompactBinary::hasFormat(const MemoryBuffer &Buffer) {
const uint8_t *Data =
reinterpret_cast<const uint8_t *>(Buffer.getBufferStart());
uint64_t Magic = decodeULEB128(Data);
return Magic == SPMagic(SPF_Compact_Binary);
}
std::error_code SampleProfileReaderGCC::skipNextWord() {
uint32_t dummy;
if (!GcovBuffer.readInt(dummy))
return sampleprof_error::truncated;
return sampleprof_error::success;
}
template <typename T> ErrorOr<T> SampleProfileReaderGCC::readNumber() {
if (sizeof(T) <= sizeof(uint32_t)) {
uint32_t Val;
if (GcovBuffer.readInt(Val) && Val <= std::numeric_limits<T>::max())
return static_cast<T>(Val);
} else if (sizeof(T) <= sizeof(uint64_t)) {
uint64_t Val;
if (GcovBuffer.readInt64(Val) && Val <= std::numeric_limits<T>::max())
return static_cast<T>(Val);
}
std::error_code EC = sampleprof_error::malformed;
reportError(0, EC.message());
return EC;
}
ErrorOr<StringRef> SampleProfileReaderGCC::readString() {
StringRef Str;
if (!GcovBuffer.readString(Str))
return sampleprof_error::truncated;
return Str;
}
std::error_code SampleProfileReaderGCC::readHeader() {
// Read the magic identifier.
if (!GcovBuffer.readGCDAFormat())
return sampleprof_error::unrecognized_format;
// Read the version number. Note - the GCC reader does not validate this
// version, but the profile creator generates v704.
GCOV::GCOVVersion version;
if (!GcovBuffer.readGCOVVersion(version))
return sampleprof_error::unrecognized_format;
if (version != GCOV::V704)
return sampleprof_error::unsupported_version;
// Skip the empty integer.
if (std::error_code EC = skipNextWord())
return EC;
return sampleprof_error::success;
}
std::error_code SampleProfileReaderGCC::readSectionTag(uint32_t Expected) {
uint32_t Tag;
if (!GcovBuffer.readInt(Tag))
return sampleprof_error::truncated;
if (Tag != Expected)
return sampleprof_error::malformed;
if (std::error_code EC = skipNextWord())
return EC;
return sampleprof_error::success;
}
std::error_code SampleProfileReaderGCC::readNameTable() {
if (std::error_code EC = readSectionTag(GCOVTagAFDOFileNames))
return EC;
uint32_t Size;
if (!GcovBuffer.readInt(Size))
return sampleprof_error::truncated;
for (uint32_t I = 0; I < Size; ++I) {
StringRef Str;
if (!GcovBuffer.readString(Str))
return sampleprof_error::truncated;
Names.push_back(Str);
}
return sampleprof_error::success;
}
std::error_code SampleProfileReaderGCC::readFunctionProfiles() {
if (std::error_code EC = readSectionTag(GCOVTagAFDOFunction))
return EC;
uint32_t NumFunctions;
if (!GcovBuffer.readInt(NumFunctions))
return sampleprof_error::truncated;
InlineCallStack Stack;
for (uint32_t I = 0; I < NumFunctions; ++I)
if (std::error_code EC = readOneFunctionProfile(Stack, true, 0))
return EC;
computeSummary();
return sampleprof_error::success;
}
std::error_code SampleProfileReaderGCC::readOneFunctionProfile(
const InlineCallStack &InlineStack, bool Update, uint32_t Offset) {
uint64_t HeadCount = 0;
if (InlineStack.size() == 0)
if (!GcovBuffer.readInt64(HeadCount))
return sampleprof_error::truncated;
uint32_t NameIdx;
if (!GcovBuffer.readInt(NameIdx))
return sampleprof_error::truncated;
StringRef Name(Names[NameIdx]);
uint32_t NumPosCounts;
if (!GcovBuffer.readInt(NumPosCounts))
return sampleprof_error::truncated;
uint32_t NumCallsites;
if (!GcovBuffer.readInt(NumCallsites))
return sampleprof_error::truncated;
FunctionSamples *FProfile = nullptr;
if (InlineStack.size() == 0) {
// If this is a top function that we have already processed, do not
// update its profile again. This happens in the presence of
// function aliases. Since these aliases share the same function
// body, there will be identical replicated profiles for the
// original function. In this case, we simply not bother updating
// the profile of the original function.
FProfile = &Profiles[Name];
FProfile->addHeadSamples(HeadCount);
if (FProfile->getTotalSamples() > 0)
Update = false;
} else {
// Otherwise, we are reading an inlined instance. The top of the
// inline stack contains the profile of the caller. Insert this
// callee in the caller's CallsiteMap.
FunctionSamples *CallerProfile = InlineStack.front();
uint32_t LineOffset = Offset >> 16;
uint32_t Discriminator = Offset & 0xffff;
FProfile = &CallerProfile->functionSamplesAt(
LineLocation(LineOffset, Discriminator))[Name];
}
FProfile->setName(Name);
for (uint32_t I = 0; I < NumPosCounts; ++I) {
uint32_t Offset;
if (!GcovBuffer.readInt(Offset))
return sampleprof_error::truncated;
uint32_t NumTargets;
if (!GcovBuffer.readInt(NumTargets))
return sampleprof_error::truncated;
uint64_t Count;
if (!GcovBuffer.readInt64(Count))
return sampleprof_error::truncated;
// The line location is encoded in the offset as:
// high 16 bits: line offset to the start of the function.
// low 16 bits: discriminator.
uint32_t LineOffset = Offset >> 16;
uint32_t Discriminator = Offset & 0xffff;
InlineCallStack NewStack;
NewStack.push_back(FProfile);
NewStack.insert(NewStack.end(), InlineStack.begin(), InlineStack.end());
if (Update) {
// Walk up the inline stack, adding the samples on this line to
// the total sample count of the callers in the chain.
for (auto CallerProfile : NewStack)
CallerProfile->addTotalSamples(Count);
// Update the body samples for the current profile.
FProfile->addBodySamples(LineOffset, Discriminator, Count);
}
// Process the list of functions called at an indirect call site.
// These are all the targets that a function pointer (or virtual
// function) resolved at runtime.
for (uint32_t J = 0; J < NumTargets; J++) {
uint32_t HistVal;
if (!GcovBuffer.readInt(HistVal))
return sampleprof_error::truncated;
if (HistVal != HIST_TYPE_INDIR_CALL_TOPN)
return sampleprof_error::malformed;
uint64_t TargetIdx;
if (!GcovBuffer.readInt64(TargetIdx))
return sampleprof_error::truncated;
StringRef TargetName(Names[TargetIdx]);
uint64_t TargetCount;
if (!GcovBuffer.readInt64(TargetCount))
return sampleprof_error::truncated;
if (Update)
FProfile->addCalledTargetSamples(LineOffset, Discriminator,
TargetName, TargetCount);
}
}
// Process all the inlined callers into the current function. These
// are all the callsites that were inlined into this function.
for (uint32_t I = 0; I < NumCallsites; I++) {
// The offset is encoded as:
// high 16 bits: line offset to the start of the function.
// low 16 bits: discriminator.
uint32_t Offset;
if (!GcovBuffer.readInt(Offset))
return sampleprof_error::truncated;
InlineCallStack NewStack;
NewStack.push_back(FProfile);
NewStack.insert(NewStack.end(), InlineStack.begin(), InlineStack.end());
if (std::error_code EC = readOneFunctionProfile(NewStack, Update, Offset))
return EC;
}
return sampleprof_error::success;
}
/// Read a GCC AutoFDO profile.
///
/// This format is generated by the Linux Perf conversion tool at
/// https://github.com/google/autofdo.
std::error_code SampleProfileReaderGCC::read() {
// Read the string table.
if (std::error_code EC = readNameTable())
return EC;
// Read the source profile.
if (std::error_code EC = readFunctionProfiles())
return EC;
return sampleprof_error::success;
}
bool SampleProfileReaderGCC::hasFormat(const MemoryBuffer &Buffer) {
StringRef Magic(reinterpret_cast<const char *>(Buffer.getBufferStart()));
return Magic == "adcg*704";
}
/// Prepare a memory buffer for the contents of \p Filename.
///
/// \returns an error code indicating the status of the buffer.
static ErrorOr<std::unique_ptr<MemoryBuffer>>
setupMemoryBuffer(const Twine &Filename) {
auto BufferOrErr = MemoryBuffer::getFileOrSTDIN(Filename);
if (std::error_code EC = BufferOrErr.getError())
return EC;
auto Buffer = std::move(BufferOrErr.get());
// Sanity check the file.
if (uint64_t(Buffer->getBufferSize()) > std::numeric_limits<uint32_t>::max())
return sampleprof_error::too_large;
return std::move(Buffer);
}
/// Create a sample profile reader based on the format of the input file.
///
/// \param Filename The file to open.
///
/// \param C The LLVM context to use to emit diagnostics.
///
/// \returns an error code indicating the status of the created reader.
ErrorOr<std::unique_ptr<SampleProfileReader>>
SampleProfileReader::create(const Twine &Filename, LLVMContext &C) {
auto BufferOrError = setupMemoryBuffer(Filename);
if (std::error_code EC = BufferOrError.getError())
return EC;
return create(BufferOrError.get(), C);
}
/// Create a sample profile reader based on the format of the input data.
///
/// \param B The memory buffer to create the reader from (assumes ownership).
///
/// \param C The LLVM context to use to emit diagnostics.
///
/// \returns an error code indicating the status of the created reader.
ErrorOr<std::unique_ptr<SampleProfileReader>>
SampleProfileReader::create(std::unique_ptr<MemoryBuffer> &B, LLVMContext &C) {
std::unique_ptr<SampleProfileReader> Reader;
if (SampleProfileReaderRawBinary::hasFormat(*B))
Reader.reset(new SampleProfileReaderRawBinary(std::move(B), C));
else if (SampleProfileReaderCompactBinary::hasFormat(*B))
Reader.reset(new SampleProfileReaderCompactBinary(std::move(B), C));
else if (SampleProfileReaderGCC::hasFormat(*B))
Reader.reset(new SampleProfileReaderGCC(std::move(B), C));
else if (SampleProfileReaderText::hasFormat(*B))
Reader.reset(new SampleProfileReaderText(std::move(B), C));
else
return sampleprof_error::unrecognized_format;
FunctionSamples::Format = Reader->getFormat();
if (std::error_code EC = Reader->readHeader())
return EC;
return std::move(Reader);
}
// For text and GCC file formats, we compute the summary after reading the
// profile. Binary format has the profile summary in its header.
void SampleProfileReader::computeSummary() {
SampleProfileSummaryBuilder Builder(ProfileSummaryBuilder::DefaultCutoffs);
for (const auto &I : Profiles) {
const FunctionSamples &Profile = I.second;
Builder.addRecord(Profile);
}
Summary = Builder.getSummary();
}
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