mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-25 00:29:20 +00:00
The getBinary and getBuffer method now return ordinary pointers of appropriate const-ness. Ownership is transferred by calling takeBinary(), which returns a pair of the Binary and a MemoryBuffer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221003 91177308-0d34-0410-b5e6-96231b3b80d8
554 lines
19 KiB
C++
554 lines
19 KiB
C++
//=-- CoverageMappingReader.cpp - Code coverage mapping reader ----*- C++ -*-=//
|
|
//
|
|
// 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 coverage mapping data for
|
|
// instrumentation based coverage.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ProfileData/CoverageMappingReader.h"
|
|
#include "llvm/ADT/DenseSet.h"
|
|
#include "llvm/Object/ObjectFile.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/LEB128.h"
|
|
|
|
using namespace llvm;
|
|
using namespace coverage;
|
|
using namespace object;
|
|
|
|
#define DEBUG_TYPE "coverage-mapping"
|
|
|
|
void CoverageMappingIterator::increment() {
|
|
// Check if all the records were read or if an error occurred while reading
|
|
// the next record.
|
|
if (Reader->readNextRecord(Record))
|
|
*this = CoverageMappingIterator();
|
|
}
|
|
|
|
std::error_code RawCoverageReader::readULEB128(uint64_t &Result) {
|
|
if (Data.size() < 1)
|
|
return error(instrprof_error::truncated);
|
|
unsigned N = 0;
|
|
Result = decodeULEB128(reinterpret_cast<const uint8_t *>(Data.data()), &N);
|
|
if (N > Data.size())
|
|
return error(instrprof_error::malformed);
|
|
Data = Data.substr(N);
|
|
return success();
|
|
}
|
|
|
|
std::error_code RawCoverageReader::readIntMax(uint64_t &Result,
|
|
uint64_t MaxPlus1) {
|
|
if (auto Err = readULEB128(Result))
|
|
return Err;
|
|
if (Result >= MaxPlus1)
|
|
return error(instrprof_error::malformed);
|
|
return success();
|
|
}
|
|
|
|
std::error_code RawCoverageReader::readSize(uint64_t &Result) {
|
|
if (auto Err = readULEB128(Result))
|
|
return Err;
|
|
// Sanity check the number.
|
|
if (Result > Data.size())
|
|
return error(instrprof_error::malformed);
|
|
return success();
|
|
}
|
|
|
|
std::error_code RawCoverageReader::readString(StringRef &Result) {
|
|
uint64_t Length;
|
|
if (auto Err = readSize(Length))
|
|
return Err;
|
|
Result = Data.substr(0, Length);
|
|
Data = Data.substr(Length);
|
|
return success();
|
|
}
|
|
|
|
std::error_code RawCoverageFilenamesReader::read() {
|
|
uint64_t NumFilenames;
|
|
if (auto Err = readSize(NumFilenames))
|
|
return Err;
|
|
for (size_t I = 0; I < NumFilenames; ++I) {
|
|
StringRef Filename;
|
|
if (auto Err = readString(Filename))
|
|
return Err;
|
|
Filenames.push_back(Filename);
|
|
}
|
|
return success();
|
|
}
|
|
|
|
std::error_code RawCoverageMappingReader::decodeCounter(unsigned Value,
|
|
Counter &C) {
|
|
auto Tag = Value & Counter::EncodingTagMask;
|
|
switch (Tag) {
|
|
case Counter::Zero:
|
|
C = Counter::getZero();
|
|
return success();
|
|
case Counter::CounterValueReference:
|
|
C = Counter::getCounter(Value >> Counter::EncodingTagBits);
|
|
return success();
|
|
default:
|
|
break;
|
|
}
|
|
Tag -= Counter::Expression;
|
|
switch (Tag) {
|
|
case CounterExpression::Subtract:
|
|
case CounterExpression::Add: {
|
|
auto ID = Value >> Counter::EncodingTagBits;
|
|
if (ID >= Expressions.size())
|
|
return error(instrprof_error::malformed);
|
|
Expressions[ID].Kind = CounterExpression::ExprKind(Tag);
|
|
C = Counter::getExpression(ID);
|
|
break;
|
|
}
|
|
default:
|
|
return error(instrprof_error::malformed);
|
|
}
|
|
return success();
|
|
}
|
|
|
|
std::error_code RawCoverageMappingReader::readCounter(Counter &C) {
|
|
uint64_t EncodedCounter;
|
|
if (auto Err =
|
|
readIntMax(EncodedCounter, std::numeric_limits<unsigned>::max()))
|
|
return Err;
|
|
if (auto Err = decodeCounter(EncodedCounter, C))
|
|
return Err;
|
|
return success();
|
|
}
|
|
|
|
static const unsigned EncodingExpansionRegionBit = 1
|
|
<< Counter::EncodingTagBits;
|
|
|
|
/// \brief Read the sub-array of regions for the given inferred file id.
|
|
/// \param NumFileIDs the number of file ids that are defined for this
|
|
/// function.
|
|
std::error_code RawCoverageMappingReader::readMappingRegionsSubArray(
|
|
std::vector<CounterMappingRegion> &MappingRegions, unsigned InferredFileID,
|
|
size_t NumFileIDs) {
|
|
uint64_t NumRegions;
|
|
if (auto Err = readSize(NumRegions))
|
|
return Err;
|
|
unsigned LineStart = 0;
|
|
for (size_t I = 0; I < NumRegions; ++I) {
|
|
Counter C;
|
|
CounterMappingRegion::RegionKind Kind = CounterMappingRegion::CodeRegion;
|
|
|
|
// Read the combined counter + region kind.
|
|
uint64_t EncodedCounterAndRegion;
|
|
if (auto Err = readIntMax(EncodedCounterAndRegion,
|
|
std::numeric_limits<unsigned>::max()))
|
|
return Err;
|
|
unsigned Tag = EncodedCounterAndRegion & Counter::EncodingTagMask;
|
|
uint64_t ExpandedFileID = 0;
|
|
if (Tag != Counter::Zero) {
|
|
if (auto Err = decodeCounter(EncodedCounterAndRegion, C))
|
|
return Err;
|
|
} else {
|
|
// Is it an expansion region?
|
|
if (EncodedCounterAndRegion & EncodingExpansionRegionBit) {
|
|
Kind = CounterMappingRegion::ExpansionRegion;
|
|
ExpandedFileID = EncodedCounterAndRegion >>
|
|
Counter::EncodingCounterTagAndExpansionRegionTagBits;
|
|
if (ExpandedFileID >= NumFileIDs)
|
|
return error(instrprof_error::malformed);
|
|
} else {
|
|
switch (EncodedCounterAndRegion >>
|
|
Counter::EncodingCounterTagAndExpansionRegionTagBits) {
|
|
case CounterMappingRegion::CodeRegion:
|
|
// Don't do anything when we have a code region with a zero counter.
|
|
break;
|
|
case CounterMappingRegion::SkippedRegion:
|
|
Kind = CounterMappingRegion::SkippedRegion;
|
|
break;
|
|
default:
|
|
return error(instrprof_error::malformed);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read the source range.
|
|
uint64_t LineStartDelta, CodeBeforeColumnStart, NumLines, ColumnEnd;
|
|
if (auto Err =
|
|
readIntMax(LineStartDelta, std::numeric_limits<unsigned>::max()))
|
|
return Err;
|
|
if (auto Err = readULEB128(CodeBeforeColumnStart))
|
|
return Err;
|
|
bool HasCodeBefore = CodeBeforeColumnStart & 1;
|
|
uint64_t ColumnStart = CodeBeforeColumnStart >>
|
|
CounterMappingRegion::EncodingHasCodeBeforeBits;
|
|
if (ColumnStart > std::numeric_limits<unsigned>::max())
|
|
return error(instrprof_error::malformed);
|
|
if (auto Err = readIntMax(NumLines, std::numeric_limits<unsigned>::max()))
|
|
return Err;
|
|
if (auto Err = readIntMax(ColumnEnd, std::numeric_limits<unsigned>::max()))
|
|
return Err;
|
|
LineStart += LineStartDelta;
|
|
// Adjust the column locations for the empty regions that are supposed to
|
|
// cover whole lines. Those regions should be encoded with the
|
|
// column range (1 -> std::numeric_limits<unsigned>::max()), but because
|
|
// the encoded std::numeric_limits<unsigned>::max() is several bytes long,
|
|
// we set the column range to (0 -> 0) to ensure that the column start and
|
|
// column end take up one byte each.
|
|
// The std::numeric_limits<unsigned>::max() is used to represent a column
|
|
// position at the end of the line without knowing the length of that line.
|
|
if (ColumnStart == 0 && ColumnEnd == 0) {
|
|
ColumnStart = 1;
|
|
ColumnEnd = std::numeric_limits<unsigned>::max();
|
|
}
|
|
|
|
DEBUG({
|
|
dbgs() << "Counter in file " << InferredFileID << " " << LineStart << ":"
|
|
<< ColumnStart << " -> " << (LineStart + NumLines) << ":"
|
|
<< ColumnEnd << ", ";
|
|
if (Kind == CounterMappingRegion::ExpansionRegion)
|
|
dbgs() << "Expands to file " << ExpandedFileID;
|
|
else
|
|
CounterMappingContext(Expressions).dump(C, dbgs());
|
|
dbgs() << "\n";
|
|
});
|
|
|
|
MappingRegions.push_back(CounterMappingRegion(
|
|
C, InferredFileID, LineStart, ColumnStart, LineStart + NumLines,
|
|
ColumnEnd, HasCodeBefore, Kind));
|
|
MappingRegions.back().ExpandedFileID = ExpandedFileID;
|
|
}
|
|
return success();
|
|
}
|
|
|
|
std::error_code RawCoverageMappingReader::read(CoverageMappingRecord &Record) {
|
|
|
|
// Read the virtual file mapping.
|
|
llvm::SmallVector<unsigned, 8> VirtualFileMapping;
|
|
uint64_t NumFileMappings;
|
|
if (auto Err = readSize(NumFileMappings))
|
|
return Err;
|
|
for (size_t I = 0; I < NumFileMappings; ++I) {
|
|
uint64_t FilenameIndex;
|
|
if (auto Err = readIntMax(FilenameIndex, TranslationUnitFilenames.size()))
|
|
return Err;
|
|
VirtualFileMapping.push_back(FilenameIndex);
|
|
}
|
|
|
|
// Construct the files using unique filenames and virtual file mapping.
|
|
for (auto I : VirtualFileMapping) {
|
|
Filenames.push_back(TranslationUnitFilenames[I]);
|
|
}
|
|
|
|
// Read the expressions.
|
|
uint64_t NumExpressions;
|
|
if (auto Err = readSize(NumExpressions))
|
|
return Err;
|
|
// Create an array of dummy expressions that get the proper counters
|
|
// when the expressions are read, and the proper kinds when the counters
|
|
// are decoded.
|
|
Expressions.resize(
|
|
NumExpressions,
|
|
CounterExpression(CounterExpression::Subtract, Counter(), Counter()));
|
|
for (size_t I = 0; I < NumExpressions; ++I) {
|
|
if (auto Err = readCounter(Expressions[I].LHS))
|
|
return Err;
|
|
if (auto Err = readCounter(Expressions[I].RHS))
|
|
return Err;
|
|
}
|
|
|
|
// Read the mapping regions sub-arrays.
|
|
for (unsigned InferredFileID = 0, S = VirtualFileMapping.size();
|
|
InferredFileID < S; ++InferredFileID) {
|
|
if (auto Err = readMappingRegionsSubArray(MappingRegions, InferredFileID,
|
|
VirtualFileMapping.size()))
|
|
return Err;
|
|
}
|
|
|
|
// Set the counters for the expansion regions.
|
|
// i.e. Counter of expansion region = counter of the first region
|
|
// from the expanded file.
|
|
// Perform multiple passes to correctly propagate the counters through
|
|
// all the nested expansion regions.
|
|
SmallVector<CounterMappingRegion *, 8> FileIDExpansionRegionMapping;
|
|
FileIDExpansionRegionMapping.resize(VirtualFileMapping.size(), nullptr);
|
|
for (unsigned Pass = 1, S = VirtualFileMapping.size(); Pass < S; ++Pass) {
|
|
for (auto &R : MappingRegions) {
|
|
if (R.Kind != CounterMappingRegion::ExpansionRegion)
|
|
continue;
|
|
assert(!FileIDExpansionRegionMapping[R.ExpandedFileID]);
|
|
FileIDExpansionRegionMapping[R.ExpandedFileID] = &R;
|
|
}
|
|
for (auto &R : MappingRegions) {
|
|
if (FileIDExpansionRegionMapping[R.FileID]) {
|
|
FileIDExpansionRegionMapping[R.FileID]->Count = R.Count;
|
|
FileIDExpansionRegionMapping[R.FileID] = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
Record.FunctionName = FunctionName;
|
|
Record.Filenames = Filenames;
|
|
Record.Expressions = Expressions;
|
|
Record.MappingRegions = MappingRegions;
|
|
return success();
|
|
}
|
|
|
|
ObjectFileCoverageMappingReader::ObjectFileCoverageMappingReader(
|
|
StringRef FileName)
|
|
: CurrentRecord(0) {
|
|
auto File = llvm::object::ObjectFile::createObjectFile(FileName);
|
|
if (!File)
|
|
error(File.getError());
|
|
else
|
|
Object = std::move(File.get());
|
|
}
|
|
|
|
namespace {
|
|
/// \brief The coverage mapping data for a single function.
|
|
/// It points to the function's name.
|
|
template <typename IntPtrT> struct CoverageMappingFunctionRecord {
|
|
IntPtrT FunctionNamePtr;
|
|
uint32_t FunctionNameSize;
|
|
uint32_t CoverageMappingSize;
|
|
uint64_t FunctionHash;
|
|
};
|
|
|
|
/// \brief The coverage mapping data for a single translation unit.
|
|
/// It points to the array of function coverage mapping records and the encoded
|
|
/// filenames array.
|
|
template <typename IntPtrT> struct CoverageMappingTURecord {
|
|
uint32_t FunctionRecordsSize;
|
|
uint32_t FilenamesSize;
|
|
uint32_t CoverageMappingsSize;
|
|
uint32_t Version;
|
|
};
|
|
|
|
/// \brief A helper structure to access the data from a section
|
|
/// in an object file.
|
|
struct SectionData {
|
|
StringRef Data;
|
|
uint64_t Address;
|
|
|
|
std::error_code load(SectionRef &Section) {
|
|
if (auto Err = Section.getContents(Data))
|
|
return Err;
|
|
Address = Section.getAddress();
|
|
return instrprof_error::success;
|
|
}
|
|
|
|
std::error_code get(uint64_t Pointer, size_t Size, StringRef &Result) {
|
|
if (Pointer < Address)
|
|
return instrprof_error::malformed;
|
|
auto Offset = Pointer - Address;
|
|
if (Offset + Size > Data.size())
|
|
return instrprof_error::malformed;
|
|
Result = Data.substr(Pointer - Address, Size);
|
|
return instrprof_error::success;
|
|
}
|
|
};
|
|
}
|
|
|
|
template <typename T>
|
|
std::error_code readCoverageMappingData(
|
|
SectionData &ProfileNames, StringRef Data,
|
|
std::vector<ObjectFileCoverageMappingReader::ProfileMappingRecord> &Records,
|
|
std::vector<StringRef> &Filenames) {
|
|
llvm::DenseSet<T> UniqueFunctionMappingData;
|
|
|
|
// Read the records in the coverage data section.
|
|
while (!Data.empty()) {
|
|
if (Data.size() < sizeof(CoverageMappingTURecord<T>))
|
|
return instrprof_error::malformed;
|
|
auto TU = reinterpret_cast<const CoverageMappingTURecord<T> *>(Data.data());
|
|
Data = Data.substr(sizeof(CoverageMappingTURecord<T>));
|
|
switch (TU->Version) {
|
|
case CoverageMappingVersion1:
|
|
break;
|
|
default:
|
|
return instrprof_error::unsupported_version;
|
|
}
|
|
auto Version = CoverageMappingVersion(TU->Version);
|
|
|
|
// Get the function records.
|
|
auto FunctionRecords =
|
|
reinterpret_cast<const CoverageMappingFunctionRecord<T> *>(Data.data());
|
|
if (Data.size() <
|
|
sizeof(CoverageMappingFunctionRecord<T>) * TU->FunctionRecordsSize)
|
|
return instrprof_error::malformed;
|
|
Data = Data.substr(sizeof(CoverageMappingFunctionRecord<T>) *
|
|
TU->FunctionRecordsSize);
|
|
|
|
// Get the filenames.
|
|
if (Data.size() < TU->FilenamesSize)
|
|
return instrprof_error::malformed;
|
|
auto RawFilenames = Data.substr(0, TU->FilenamesSize);
|
|
Data = Data.substr(TU->FilenamesSize);
|
|
size_t FilenamesBegin = Filenames.size();
|
|
RawCoverageFilenamesReader Reader(RawFilenames, Filenames);
|
|
if (auto Err = Reader.read())
|
|
return Err;
|
|
|
|
// Get the coverage mappings.
|
|
if (Data.size() < TU->CoverageMappingsSize)
|
|
return instrprof_error::malformed;
|
|
auto CoverageMappings = Data.substr(0, TU->CoverageMappingsSize);
|
|
Data = Data.substr(TU->CoverageMappingsSize);
|
|
|
|
for (unsigned I = 0; I < TU->FunctionRecordsSize; ++I) {
|
|
auto &MappingRecord = FunctionRecords[I];
|
|
|
|
// Get the coverage mapping.
|
|
if (CoverageMappings.size() < MappingRecord.CoverageMappingSize)
|
|
return instrprof_error::malformed;
|
|
auto Mapping =
|
|
CoverageMappings.substr(0, MappingRecord.CoverageMappingSize);
|
|
CoverageMappings =
|
|
CoverageMappings.substr(MappingRecord.CoverageMappingSize);
|
|
|
|
// Ignore this record if we already have a record that points to the same
|
|
// function name.
|
|
// This is useful to ignore the redundant records for the functions
|
|
// with ODR linkage.
|
|
if (!UniqueFunctionMappingData.insert(MappingRecord.FunctionNamePtr)
|
|
.second)
|
|
continue;
|
|
StringRef FunctionName;
|
|
if (auto Err =
|
|
ProfileNames.get(MappingRecord.FunctionNamePtr,
|
|
MappingRecord.FunctionNameSize, FunctionName))
|
|
return Err;
|
|
Records.push_back(ObjectFileCoverageMappingReader::ProfileMappingRecord(
|
|
Version, FunctionName, MappingRecord.FunctionHash, Mapping,
|
|
FilenamesBegin, Filenames.size() - FilenamesBegin));
|
|
}
|
|
}
|
|
|
|
return instrprof_error::success;
|
|
}
|
|
|
|
static const char *TestingFormatMagic = "llvmcovmtestdata";
|
|
|
|
static std::error_code decodeTestingFormat(StringRef Data,
|
|
SectionData &ProfileNames,
|
|
StringRef &CoverageMapping) {
|
|
Data = Data.substr(StringRef(TestingFormatMagic).size());
|
|
if (Data.size() < 1)
|
|
return instrprof_error::truncated;
|
|
unsigned N = 0;
|
|
auto ProfileNamesSize =
|
|
decodeULEB128(reinterpret_cast<const uint8_t *>(Data.data()), &N);
|
|
if (N > Data.size())
|
|
return instrprof_error::malformed;
|
|
Data = Data.substr(N);
|
|
if (Data.size() < 1)
|
|
return instrprof_error::truncated;
|
|
N = 0;
|
|
ProfileNames.Address =
|
|
decodeULEB128(reinterpret_cast<const uint8_t *>(Data.data()), &N);
|
|
if (N > Data.size())
|
|
return instrprof_error::malformed;
|
|
Data = Data.substr(N);
|
|
if (Data.size() < ProfileNamesSize)
|
|
return instrprof_error::malformed;
|
|
ProfileNames.Data = Data.substr(0, ProfileNamesSize);
|
|
CoverageMapping = Data.substr(ProfileNamesSize);
|
|
return instrprof_error::success;
|
|
}
|
|
|
|
ObjectFileCoverageMappingReader::ObjectFileCoverageMappingReader(
|
|
std::unique_ptr<MemoryBuffer> &ObjectBuffer, sys::fs::file_magic Type)
|
|
: CurrentRecord(0) {
|
|
if (ObjectBuffer->getBuffer().startswith(TestingFormatMagic)) {
|
|
// This is a special format used for testing.
|
|
SectionData ProfileNames;
|
|
StringRef CoverageMapping;
|
|
if (auto Err = decodeTestingFormat(ObjectBuffer->getBuffer(), ProfileNames,
|
|
CoverageMapping)) {
|
|
error(Err);
|
|
return;
|
|
}
|
|
error(readCoverageMappingData<uint64_t>(ProfileNames, CoverageMapping,
|
|
MappingRecords, Filenames));
|
|
Object = OwningBinary<ObjectFile>(std::unique_ptr<ObjectFile>(),
|
|
std::move(ObjectBuffer));
|
|
return;
|
|
}
|
|
|
|
auto File = object::ObjectFile::createObjectFile(
|
|
ObjectBuffer->getMemBufferRef(), Type);
|
|
if (!File)
|
|
error(File.getError());
|
|
else
|
|
Object = OwningBinary<ObjectFile>(std::move(File.get()),
|
|
std::move(ObjectBuffer));
|
|
}
|
|
|
|
std::error_code ObjectFileCoverageMappingReader::readHeader() {
|
|
const ObjectFile *OF = Object.getBinary();
|
|
if (!OF)
|
|
return getError();
|
|
auto BytesInAddress = OF->getBytesInAddress();
|
|
if (BytesInAddress != 4 && BytesInAddress != 8)
|
|
return error(instrprof_error::malformed);
|
|
|
|
// Look for the sections that we are interested in.
|
|
int FoundSectionCount = 0;
|
|
SectionRef ProfileNames, CoverageMapping;
|
|
for (const auto &Section : OF->sections()) {
|
|
StringRef Name;
|
|
if (auto Err = Section.getName(Name))
|
|
return Err;
|
|
if (Name == "__llvm_prf_names") {
|
|
ProfileNames = Section;
|
|
} else if (Name == "__llvm_covmap") {
|
|
CoverageMapping = Section;
|
|
} else
|
|
continue;
|
|
++FoundSectionCount;
|
|
}
|
|
if (FoundSectionCount != 2)
|
|
return error(instrprof_error::bad_header);
|
|
|
|
// Get the contents of the given sections.
|
|
StringRef Data;
|
|
if (auto Err = CoverageMapping.getContents(Data))
|
|
return Err;
|
|
SectionData ProfileNamesData;
|
|
if (auto Err = ProfileNamesData.load(ProfileNames))
|
|
return Err;
|
|
|
|
// Load the data from the found sections.
|
|
std::error_code Err;
|
|
if (BytesInAddress == 4)
|
|
Err = readCoverageMappingData<uint32_t>(ProfileNamesData, Data,
|
|
MappingRecords, Filenames);
|
|
else
|
|
Err = readCoverageMappingData<uint64_t>(ProfileNamesData, Data,
|
|
MappingRecords, Filenames);
|
|
if (Err)
|
|
return error(Err);
|
|
|
|
return success();
|
|
}
|
|
|
|
std::error_code
|
|
ObjectFileCoverageMappingReader::readNextRecord(CoverageMappingRecord &Record) {
|
|
if (CurrentRecord >= MappingRecords.size())
|
|
return error(instrprof_error::eof);
|
|
|
|
FunctionsFilenames.clear();
|
|
Expressions.clear();
|
|
MappingRegions.clear();
|
|
auto &R = MappingRecords[CurrentRecord];
|
|
RawCoverageMappingReader Reader(
|
|
R.FunctionName, R.CoverageMapping,
|
|
makeArrayRef(Filenames.data() + R.FilenamesBegin, R.FilenamesSize),
|
|
FunctionsFilenames, Expressions, MappingRegions);
|
|
if (auto Err = Reader.read(Record))
|
|
return Err;
|
|
Record.FunctionHash = R.FunctionHash;
|
|
++CurrentRecord;
|
|
return success();
|
|
}
|