mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-27 15:29:51 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231685 91177308-0d34-0410-b5e6-96231b3b80d8
414 lines
14 KiB
C++
414 lines
14 KiB
C++
//=-- 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 "InstrProfIndexed.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/ProfileData/InstrProf.h"
|
|
#include <cassert>
|
|
|
|
using namespace llvm;
|
|
|
|
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
|
setupMemoryBuffer(std::string Path) {
|
|
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
|
|
MemoryBuffer::getFileOrSTDIN(Path);
|
|
if (std::error_code EC = BufferOrErr.getError())
|
|
return EC;
|
|
return std::move(BufferOrErr.get());
|
|
}
|
|
|
|
static std::error_code initializeReader(InstrProfReader &Reader) {
|
|
return Reader.readHeader();
|
|
}
|
|
|
|
ErrorOr<std::unique_ptr<InstrProfReader>>
|
|
InstrProfReader::create(std::string Path) {
|
|
// Set up the buffer to read.
|
|
auto BufferOrError = setupMemoryBuffer(Path);
|
|
if (std::error_code EC = BufferOrError.getError())
|
|
return EC;
|
|
return InstrProfReader::create(std::move(BufferOrError.get()));
|
|
}
|
|
|
|
ErrorOr<std::unique_ptr<InstrProfReader>>
|
|
InstrProfReader::create(std::unique_ptr<MemoryBuffer> Buffer) {
|
|
// Sanity check the buffer.
|
|
if (Buffer->getBufferSize() > std::numeric_limits<unsigned>::max())
|
|
return instrprof_error::too_large;
|
|
|
|
std::unique_ptr<InstrProfReader> Result;
|
|
// Create the reader.
|
|
if (IndexedInstrProfReader::hasFormat(*Buffer))
|
|
Result.reset(new IndexedInstrProfReader(std::move(Buffer)));
|
|
else 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)));
|
|
|
|
// Initialize the reader and return the result.
|
|
if (std::error_code EC = initializeReader(*Result))
|
|
return EC;
|
|
|
|
return std::move(Result);
|
|
}
|
|
|
|
ErrorOr<std::unique_ptr<IndexedInstrProfReader>>
|
|
IndexedInstrProfReader::create(std::string Path) {
|
|
// Set up the buffer to read.
|
|
auto BufferOrError = setupMemoryBuffer(Path);
|
|
if (std::error_code EC = BufferOrError.getError())
|
|
return EC;
|
|
return IndexedInstrProfReader::create(std::move(BufferOrError.get()));
|
|
}
|
|
|
|
|
|
ErrorOr<std::unique_ptr<IndexedInstrProfReader>>
|
|
IndexedInstrProfReader::create(std::unique_ptr<MemoryBuffer> Buffer) {
|
|
// Sanity check the buffer.
|
|
if (Buffer->getBufferSize() > std::numeric_limits<unsigned>::max())
|
|
return instrprof_error::too_large;
|
|
|
|
// Create the reader.
|
|
if (!IndexedInstrProfReader::hasFormat(*Buffer))
|
|
return instrprof_error::bad_magic;
|
|
auto Result = llvm::make_unique<IndexedInstrProfReader>(std::move(Buffer));
|
|
|
|
// Initialize the reader and return the result.
|
|
if (std::error_code EC = initializeReader(*Result))
|
|
return EC;
|
|
|
|
return std::move(Result);
|
|
}
|
|
|
|
void InstrProfIterator::Increment() {
|
|
if (Reader->readNextRecord(Record))
|
|
*this = InstrProfIterator();
|
|
}
|
|
|
|
std::error_code TextInstrProfReader::readNextRecord(InstrProfRecord &Record) {
|
|
// Skip empty lines and comments.
|
|
while (!Line.is_at_end() && (Line->empty() || Line->startswith("#")))
|
|
++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(0, 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);
|
|
if (NumCounters == 0)
|
|
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::getSwappedBytes(getRawMagic<IntPtrT>()) == Magic;
|
|
}
|
|
|
|
template <class IntPtrT>
|
|
std::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);
|
|
}
|
|
|
|
template <class IntPtrT>
|
|
std::error_code
|
|
RawInstrProfReader<IntPtrT>::readNextHeader(const char *CurrentPos) {
|
|
const char *End = DataBuffer->getBufferEnd();
|
|
// Skip zero padding between profiles.
|
|
while (CurrentPos != End && *CurrentPos == 0)
|
|
++CurrentPos;
|
|
// If there's nothing left, we're done.
|
|
if (CurrentPos == End)
|
|
return instrprof_error::eof;
|
|
// If there isn't enough space for another header, this is probably just
|
|
// garbage at the end of the file.
|
|
if (CurrentPos + sizeof(RawHeader) > End)
|
|
return instrprof_error::malformed;
|
|
// The writer ensures each profile is padded to start at an aligned address.
|
|
if (reinterpret_cast<size_t>(CurrentPos) % alignOf<uint64_t>())
|
|
return instrprof_error::malformed;
|
|
// The magic should have the same byte order as in the previous header.
|
|
uint64_t Magic = *reinterpret_cast<const uint64_t *>(CurrentPos);
|
|
if (Magic != swap(getRawMagic<IntPtrT>()))
|
|
return instrprof_error::bad_magic;
|
|
|
|
// There's another profile to read, so we need to process the header.
|
|
auto *Header = reinterpret_cast<const RawHeader *>(CurrentPos);
|
|
return readHeader(*Header);
|
|
}
|
|
|
|
static uint64_t getRawVersion() {
|
|
return 1;
|
|
}
|
|
|
|
template <class IntPtrT>
|
|
std::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 ProfileSize = NamesOffset + sizeof(char) * NamesSize;
|
|
|
|
auto *Start = reinterpret_cast<const char *>(&Header);
|
|
if (Start + ProfileSize > DataBuffer->getBufferEnd())
|
|
return error(instrprof_error::bad_header);
|
|
|
|
Data = reinterpret_cast<const ProfileData *>(Start + DataOffset);
|
|
DataEnd = Data + DataSize;
|
|
CountersStart = reinterpret_cast<const uint64_t *>(Start + CountersOffset);
|
|
NamesStart = Start + NamesOffset;
|
|
ProfileEnd = Start + ProfileSize;
|
|
|
|
return success();
|
|
}
|
|
|
|
template <class IntPtrT>
|
|
std::error_code
|
|
RawInstrProfReader<IntPtrT>::readNextRecord(InstrProfRecord &Record) {
|
|
if (Data == DataEnd)
|
|
if (std::error_code EC = readNextHeader(ProfileEnd))
|
|
return EC;
|
|
|
|
// Get the raw data.
|
|
StringRef RawName(getName(Data->NamePtr), swap(Data->NameSize));
|
|
uint32_t NumCounters = swap(Data->NumCounters);
|
|
if (NumCounters == 0)
|
|
return error(instrprof_error::malformed);
|
|
auto RawCounts = makeArrayRef(getCounter(Data->CounterPtr), 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>;
|
|
}
|
|
|
|
InstrProfLookupTrait::hash_value_type
|
|
InstrProfLookupTrait::ComputeHash(StringRef K) {
|
|
return IndexedInstrProf::ComputeHash(HashType, K);
|
|
}
|
|
|
|
bool IndexedInstrProfReader::hasFormat(const MemoryBuffer &DataBuffer) {
|
|
if (DataBuffer.getBufferSize() < 8)
|
|
return false;
|
|
using namespace support;
|
|
uint64_t Magic =
|
|
endian::read<uint64_t, little, aligned>(DataBuffer.getBufferStart());
|
|
return Magic == IndexedInstrProf::Magic;
|
|
}
|
|
|
|
std::error_code IndexedInstrProfReader::readHeader() {
|
|
const unsigned char *Start =
|
|
(const unsigned char *)DataBuffer->getBufferStart();
|
|
const unsigned char *Cur = Start;
|
|
if ((const unsigned char *)DataBuffer->getBufferEnd() - Cur < 24)
|
|
return error(instrprof_error::truncated);
|
|
|
|
using namespace support;
|
|
|
|
// Check the magic number.
|
|
uint64_t Magic = endian::readNext<uint64_t, little, unaligned>(Cur);
|
|
if (Magic != IndexedInstrProf::Magic)
|
|
return error(instrprof_error::bad_magic);
|
|
|
|
// Read the version.
|
|
FormatVersion = endian::readNext<uint64_t, little, unaligned>(Cur);
|
|
if (FormatVersion > IndexedInstrProf::Version)
|
|
return error(instrprof_error::unsupported_version);
|
|
|
|
// Read the maximal function count.
|
|
MaxFunctionCount = endian::readNext<uint64_t, little, unaligned>(Cur);
|
|
|
|
// Read the hash type and start offset.
|
|
IndexedInstrProf::HashT HashType = static_cast<IndexedInstrProf::HashT>(
|
|
endian::readNext<uint64_t, little, unaligned>(Cur));
|
|
if (HashType > IndexedInstrProf::HashT::Last)
|
|
return error(instrprof_error::unsupported_hash_type);
|
|
uint64_t HashOffset = endian::readNext<uint64_t, little, unaligned>(Cur);
|
|
|
|
// The rest of the file is an on disk hash table.
|
|
Index.reset(InstrProfReaderIndex::Create(Start + HashOffset, Cur, Start,
|
|
InstrProfLookupTrait(HashType)));
|
|
// Set up our iterator for readNextRecord.
|
|
RecordIterator = Index->data_begin();
|
|
|
|
return success();
|
|
}
|
|
|
|
std::error_code IndexedInstrProfReader::getFunctionCounts(
|
|
StringRef FuncName, uint64_t FuncHash, std::vector<uint64_t> &Counts) {
|
|
auto Iter = Index->find(FuncName);
|
|
if (Iter == Index->end())
|
|
return error(instrprof_error::unknown_function);
|
|
|
|
// Found it. Look for counters with the right hash.
|
|
ArrayRef<uint64_t> Data = (*Iter).Data;
|
|
uint64_t NumCounts;
|
|
for (uint64_t I = 0, E = Data.size(); I != E; I += NumCounts) {
|
|
// The function hash comes first.
|
|
uint64_t FoundHash = Data[I++];
|
|
// In v1, we have at least one count. Later, we have the number of counts.
|
|
if (I == E)
|
|
return error(instrprof_error::malformed);
|
|
NumCounts = FormatVersion == 1 ? E - I : Data[I++];
|
|
// If we have more counts than data, this is bogus.
|
|
if (I + NumCounts > E)
|
|
return error(instrprof_error::malformed);
|
|
// Check for a match and fill the vector if there is one.
|
|
if (FoundHash == FuncHash) {
|
|
Counts = Data.slice(I, NumCounts);
|
|
return success();
|
|
}
|
|
}
|
|
return error(instrprof_error::hash_mismatch);
|
|
}
|
|
|
|
std::error_code
|
|
IndexedInstrProfReader::readNextRecord(InstrProfRecord &Record) {
|
|
// Are we out of records?
|
|
if (RecordIterator == Index->data_end())
|
|
return error(instrprof_error::eof);
|
|
|
|
// Record the current function name.
|
|
Record.Name = (*RecordIterator).Name;
|
|
|
|
ArrayRef<uint64_t> Data = (*RecordIterator).Data;
|
|
// Valid data starts with a hash and either a count or the number of counts.
|
|
if (CurrentOffset + 1 > Data.size())
|
|
return error(instrprof_error::malformed);
|
|
// First we have a function hash.
|
|
Record.Hash = Data[CurrentOffset++];
|
|
// In version 1 we knew the number of counters implicitly, but in newer
|
|
// versions we store the number of counters next.
|
|
uint64_t NumCounts =
|
|
FormatVersion == 1 ? Data.size() - CurrentOffset : Data[CurrentOffset++];
|
|
if (CurrentOffset + NumCounts > Data.size())
|
|
return error(instrprof_error::malformed);
|
|
// And finally the counts themselves.
|
|
Record.Counts = Data.slice(CurrentOffset, NumCounts);
|
|
|
|
// If we've exhausted this function's data, increment the record.
|
|
CurrentOffset += NumCounts;
|
|
if (CurrentOffset == Data.size()) {
|
|
++RecordIterator;
|
|
CurrentOffset = 0;
|
|
}
|
|
|
|
return success();
|
|
}
|