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//=-- InstrProfReader.cpp - Instrumented profiling reader -------------------=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for reading profiling data for clang's
// instrumentation based PGO and coverage.
//
//===----------------------------------------------------------------------===//
#include "llvm/ProfileData/InstrProfReader.h"
#include "llvm/ProfileData/InstrProf.h"
#include <cassert>
using namespace llvm;
error_code InstrProfReader::create(std::string Path,
std::unique_ptr<InstrProfReader> &Result) {
std::unique_ptr<MemoryBuffer> Buffer;
if (error_code EC = MemoryBuffer::getFileOrSTDIN(Path, Buffer))
return EC;
// Sanity check the file.
if (Buffer->getBufferSize() > std::numeric_limits<unsigned>::max())
return instrprof_error::too_large;
// Create the reader.
if (RawInstrProfReader64::hasFormat(*Buffer))
Result.reset(new RawInstrProfReader64(std::move(Buffer)));
else if (RawInstrProfReader32::hasFormat(*Buffer))
Result.reset(new RawInstrProfReader32(std::move(Buffer)));
else
Result.reset(new TextInstrProfReader(std::move(Buffer)));
// Read the header and return the result.
return Result->readHeader();
}
void InstrProfIterator::Increment() {
if (Reader->readNextRecord(Record))
*this = InstrProfIterator();
}
error_code TextInstrProfReader::readNextRecord(InstrProfRecord &Record) {
// Skip empty lines.
while (!Line.is_at_end() && Line->empty())
++Line;
// If we hit EOF while looking for a name, we're done.
if (Line.is_at_end())
return error(instrprof_error::eof);
// Read the function name.
Record.Name = *Line++;
// Read the function hash.
if (Line.is_at_end())
return error(instrprof_error::truncated);
if ((Line++)->getAsInteger(10, Record.Hash))
return error(instrprof_error::malformed);
// Read the number of counters.
uint64_t NumCounters;
if (Line.is_at_end())
return error(instrprof_error::truncated);
if ((Line++)->getAsInteger(10, NumCounters))
return error(instrprof_error::malformed);
// Read each counter and fill our internal storage with the values.
Counts.clear();
Counts.reserve(NumCounters);
for (uint64_t I = 0; I < NumCounters; ++I) {
if (Line.is_at_end())
return error(instrprof_error::truncated);
uint64_t Count;
if ((Line++)->getAsInteger(10, Count))
return error(instrprof_error::malformed);
Counts.push_back(Count);
}
// Give the record a reference to our internal counter storage.
Record.Counts = Counts;
return success();
}
template <class IntPtrT>
static uint64_t getRawMagic();
template <>
uint64_t getRawMagic<uint64_t>() {
return
uint64_t(255) << 56 |
uint64_t('l') << 48 |
uint64_t('p') << 40 |
uint64_t('r') << 32 |
uint64_t('o') << 24 |
uint64_t('f') << 16 |
uint64_t('r') << 8 |
uint64_t(129);
}
template <>
uint64_t getRawMagic<uint32_t>() {
return
uint64_t(255) << 56 |
uint64_t('l') << 48 |
uint64_t('p') << 40 |
uint64_t('r') << 32 |
uint64_t('o') << 24 |
uint64_t('f') << 16 |
uint64_t('R') << 8 |
uint64_t(129);
}
template <class IntPtrT>
bool RawInstrProfReader<IntPtrT>::hasFormat(const MemoryBuffer &DataBuffer) {
if (DataBuffer.getBufferSize() < sizeof(uint64_t))
return false;
uint64_t Magic =
*reinterpret_cast<const uint64_t *>(DataBuffer.getBufferStart());
return getRawMagic<IntPtrT>() == Magic ||
sys::SwapByteOrder(getRawMagic<IntPtrT>()) == Magic;
}
template <class IntPtrT>
error_code RawInstrProfReader<IntPtrT>::readHeader() {
if (!hasFormat(*DataBuffer))
return error(instrprof_error::bad_magic);
if (DataBuffer->getBufferSize() < sizeof(RawHeader))
return error(instrprof_error::bad_header);
auto *Header =
reinterpret_cast<const RawHeader *>(DataBuffer->getBufferStart());
ShouldSwapBytes = Header->Magic != getRawMagic<IntPtrT>();
return readHeader(*Header);
}
static uint64_t getRawVersion() {
return 1;
}
template <class IntPtrT>
error_code RawInstrProfReader<IntPtrT>::readHeader(const RawHeader &Header) {
if (swap(Header.Version) != getRawVersion())
return error(instrprof_error::unsupported_version);
CountersDelta = swap(Header.CountersDelta);
NamesDelta = swap(Header.NamesDelta);
auto DataSize = swap(Header.DataSize);
auto CountersSize = swap(Header.CountersSize);
auto NamesSize = swap(Header.NamesSize);
ptrdiff_t DataOffset = sizeof(RawHeader);
ptrdiff_t CountersOffset = DataOffset + sizeof(ProfileData) * DataSize;
ptrdiff_t NamesOffset = CountersOffset + sizeof(uint64_t) * CountersSize;
size_t FileSize = NamesOffset + sizeof(char) * NamesSize;
if (FileSize != DataBuffer->getBufferSize())
return error(instrprof_error::bad_header);
const char *Start = DataBuffer->getBufferStart();
Data = reinterpret_cast<const ProfileData *>(Start + DataOffset);
DataEnd = Data + DataSize;
CountersStart = reinterpret_cast<const uint64_t *>(Start + CountersOffset);
NamesStart = Start + NamesOffset;
return success();
}
template <class IntPtrT>
error_code
RawInstrProfReader<IntPtrT>::readNextRecord(InstrProfRecord &Record) {
if (Data == DataEnd)
return error(instrprof_error::eof);
// Get the raw data.
StringRef RawName(getName(Data->NamePtr), swap(Data->NameSize));
auto RawCounts = makeArrayRef(getCounter(Data->CounterPtr),
swap(Data->NumCounters));
// Check bounds.
auto *NamesStartAsCounter = reinterpret_cast<const uint64_t *>(NamesStart);
if (RawName.data() < NamesStart ||
RawName.data() + RawName.size() > DataBuffer->getBufferEnd() ||
RawCounts.data() < CountersStart ||
RawCounts.data() + RawCounts.size() > NamesStartAsCounter)
return error(instrprof_error::malformed);
// Store the data in Record, byte-swapping as necessary.
Record.Hash = swap(Data->FuncHash);
Record.Name = RawName;
if (ShouldSwapBytes) {
Counts.clear();
Counts.reserve(RawCounts.size());
for (uint64_t Count : RawCounts)
Counts.push_back(swap(Count));
Record.Counts = Counts;
} else
Record.Counts = RawCounts;
// Iterate.
++Data;
return success();
}
namespace llvm {
template class RawInstrProfReader<uint32_t>;
template class RawInstrProfReader<uint64_t>;
}
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