548 lines
20 KiB
C++
548 lines
20 KiB
C++
//=-- CoverageMappingReader.cpp - Code coverage mapping reader ----*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for reading coverage mapping data for
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// instrumentation based coverage.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ProfileData/CoverageMappingReader.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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using namespace coverage;
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using namespace object;
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#define DEBUG_TYPE "coverage-mapping"
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void CoverageMappingIterator::increment() {
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// Check if all the records were read or if an error occurred while reading
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// the next record.
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if (Reader->readNextRecord(Record))
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*this = CoverageMappingIterator();
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}
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std::error_code RawCoverageReader::readULEB128(uint64_t &Result) {
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if (Data.size() < 1)
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return coveragemap_error::truncated;
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unsigned N = 0;
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Result = decodeULEB128(reinterpret_cast<const uint8_t *>(Data.data()), &N);
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if (N > Data.size())
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return coveragemap_error::malformed;
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Data = Data.substr(N);
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return std::error_code();
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}
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std::error_code RawCoverageReader::readIntMax(uint64_t &Result,
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uint64_t MaxPlus1) {
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if (auto Err = readULEB128(Result))
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return Err;
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if (Result >= MaxPlus1)
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return coveragemap_error::malformed;
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return std::error_code();
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}
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std::error_code RawCoverageReader::readSize(uint64_t &Result) {
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if (auto Err = readULEB128(Result))
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return Err;
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// Sanity check the number.
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if (Result > Data.size())
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return coveragemap_error::malformed;
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return std::error_code();
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}
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std::error_code RawCoverageReader::readString(StringRef &Result) {
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uint64_t Length;
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if (auto Err = readSize(Length))
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return Err;
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Result = Data.substr(0, Length);
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Data = Data.substr(Length);
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return std::error_code();
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}
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std::error_code RawCoverageFilenamesReader::read() {
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uint64_t NumFilenames;
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if (auto Err = readSize(NumFilenames))
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return Err;
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for (size_t I = 0; I < NumFilenames; ++I) {
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StringRef Filename;
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if (auto Err = readString(Filename))
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return Err;
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Filenames.push_back(Filename);
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}
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return std::error_code();
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}
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std::error_code RawCoverageMappingReader::decodeCounter(unsigned Value,
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Counter &C) {
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auto Tag = Value & Counter::EncodingTagMask;
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switch (Tag) {
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case Counter::Zero:
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C = Counter::getZero();
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return std::error_code();
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case Counter::CounterValueReference:
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C = Counter::getCounter(Value >> Counter::EncodingTagBits);
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return std::error_code();
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default:
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break;
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}
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Tag -= Counter::Expression;
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switch (Tag) {
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case CounterExpression::Subtract:
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case CounterExpression::Add: {
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auto ID = Value >> Counter::EncodingTagBits;
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if (ID >= Expressions.size())
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return coveragemap_error::malformed;
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Expressions[ID].Kind = CounterExpression::ExprKind(Tag);
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C = Counter::getExpression(ID);
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break;
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}
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default:
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return coveragemap_error::malformed;
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}
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return std::error_code();
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}
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std::error_code RawCoverageMappingReader::readCounter(Counter &C) {
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uint64_t EncodedCounter;
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if (auto Err =
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readIntMax(EncodedCounter, std::numeric_limits<unsigned>::max()))
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return Err;
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if (auto Err = decodeCounter(EncodedCounter, C))
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return Err;
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return std::error_code();
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}
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static const unsigned EncodingExpansionRegionBit = 1
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<< Counter::EncodingTagBits;
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/// \brief Read the sub-array of regions for the given inferred file id.
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/// \param NumFileIDs the number of file ids that are defined for this
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/// function.
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std::error_code RawCoverageMappingReader::readMappingRegionsSubArray(
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std::vector<CounterMappingRegion> &MappingRegions, unsigned InferredFileID,
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size_t NumFileIDs) {
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uint64_t NumRegions;
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if (auto Err = readSize(NumRegions))
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return Err;
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unsigned LineStart = 0;
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for (size_t I = 0; I < NumRegions; ++I) {
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Counter C;
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CounterMappingRegion::RegionKind Kind = CounterMappingRegion::CodeRegion;
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// Read the combined counter + region kind.
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uint64_t EncodedCounterAndRegion;
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if (auto Err = readIntMax(EncodedCounterAndRegion,
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std::numeric_limits<unsigned>::max()))
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return Err;
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unsigned Tag = EncodedCounterAndRegion & Counter::EncodingTagMask;
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uint64_t ExpandedFileID = 0;
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if (Tag != Counter::Zero) {
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if (auto Err = decodeCounter(EncodedCounterAndRegion, C))
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return Err;
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} else {
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// Is it an expansion region?
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if (EncodedCounterAndRegion & EncodingExpansionRegionBit) {
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Kind = CounterMappingRegion::ExpansionRegion;
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ExpandedFileID = EncodedCounterAndRegion >>
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Counter::EncodingCounterTagAndExpansionRegionTagBits;
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if (ExpandedFileID >= NumFileIDs)
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return coveragemap_error::malformed;
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} else {
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switch (EncodedCounterAndRegion >>
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Counter::EncodingCounterTagAndExpansionRegionTagBits) {
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case CounterMappingRegion::CodeRegion:
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// Don't do anything when we have a code region with a zero counter.
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break;
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case CounterMappingRegion::SkippedRegion:
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Kind = CounterMappingRegion::SkippedRegion;
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break;
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default:
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return coveragemap_error::malformed;
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}
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}
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}
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// Read the source range.
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uint64_t LineStartDelta, ColumnStart, NumLines, ColumnEnd;
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if (auto Err =
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readIntMax(LineStartDelta, std::numeric_limits<unsigned>::max()))
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return Err;
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if (auto Err = readULEB128(ColumnStart))
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return Err;
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if (ColumnStart > std::numeric_limits<unsigned>::max())
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return coveragemap_error::malformed;
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if (auto Err = readIntMax(NumLines, std::numeric_limits<unsigned>::max()))
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return Err;
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if (auto Err = readIntMax(ColumnEnd, std::numeric_limits<unsigned>::max()))
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return Err;
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LineStart += LineStartDelta;
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// Adjust the column locations for the empty regions that are supposed to
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// cover whole lines. Those regions should be encoded with the
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// column range (1 -> std::numeric_limits<unsigned>::max()), but because
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// the encoded std::numeric_limits<unsigned>::max() is several bytes long,
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// we set the column range to (0 -> 0) to ensure that the column start and
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// column end take up one byte each.
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// The std::numeric_limits<unsigned>::max() is used to represent a column
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// position at the end of the line without knowing the length of that line.
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if (ColumnStart == 0 && ColumnEnd == 0) {
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ColumnStart = 1;
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ColumnEnd = std::numeric_limits<unsigned>::max();
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}
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DEBUG({
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dbgs() << "Counter in file " << InferredFileID << " " << LineStart << ":"
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<< ColumnStart << " -> " << (LineStart + NumLines) << ":"
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<< ColumnEnd << ", ";
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if (Kind == CounterMappingRegion::ExpansionRegion)
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dbgs() << "Expands to file " << ExpandedFileID;
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else
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CounterMappingContext(Expressions).dump(C, dbgs());
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dbgs() << "\n";
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});
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MappingRegions.push_back(CounterMappingRegion(
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C, InferredFileID, ExpandedFileID, LineStart, ColumnStart,
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LineStart + NumLines, ColumnEnd, Kind));
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}
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return std::error_code();
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}
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std::error_code RawCoverageMappingReader::read() {
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// Read the virtual file mapping.
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llvm::SmallVector<unsigned, 8> VirtualFileMapping;
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uint64_t NumFileMappings;
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if (auto Err = readSize(NumFileMappings))
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return Err;
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for (size_t I = 0; I < NumFileMappings; ++I) {
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uint64_t FilenameIndex;
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if (auto Err = readIntMax(FilenameIndex, TranslationUnitFilenames.size()))
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return Err;
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VirtualFileMapping.push_back(FilenameIndex);
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}
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// Construct the files using unique filenames and virtual file mapping.
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for (auto I : VirtualFileMapping) {
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Filenames.push_back(TranslationUnitFilenames[I]);
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}
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// Read the expressions.
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uint64_t NumExpressions;
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if (auto Err = readSize(NumExpressions))
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return Err;
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// Create an array of dummy expressions that get the proper counters
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// when the expressions are read, and the proper kinds when the counters
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// are decoded.
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Expressions.resize(
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NumExpressions,
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CounterExpression(CounterExpression::Subtract, Counter(), Counter()));
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for (size_t I = 0; I < NumExpressions; ++I) {
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if (auto Err = readCounter(Expressions[I].LHS))
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return Err;
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if (auto Err = readCounter(Expressions[I].RHS))
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return Err;
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}
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// Read the mapping regions sub-arrays.
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for (unsigned InferredFileID = 0, S = VirtualFileMapping.size();
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InferredFileID < S; ++InferredFileID) {
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if (auto Err = readMappingRegionsSubArray(MappingRegions, InferredFileID,
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VirtualFileMapping.size()))
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return Err;
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}
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// Set the counters for the expansion regions.
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// i.e. Counter of expansion region = counter of the first region
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// from the expanded file.
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// Perform multiple passes to correctly propagate the counters through
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// all the nested expansion regions.
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SmallVector<CounterMappingRegion *, 8> FileIDExpansionRegionMapping;
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FileIDExpansionRegionMapping.resize(VirtualFileMapping.size(), nullptr);
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for (unsigned Pass = 1, S = VirtualFileMapping.size(); Pass < S; ++Pass) {
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for (auto &R : MappingRegions) {
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if (R.Kind != CounterMappingRegion::ExpansionRegion)
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continue;
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assert(!FileIDExpansionRegionMapping[R.ExpandedFileID]);
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FileIDExpansionRegionMapping[R.ExpandedFileID] = &R;
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}
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for (auto &R : MappingRegions) {
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if (FileIDExpansionRegionMapping[R.FileID]) {
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FileIDExpansionRegionMapping[R.FileID]->Count = R.Count;
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FileIDExpansionRegionMapping[R.FileID] = nullptr;
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}
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}
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}
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return std::error_code();
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}
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std::error_code InstrProfSymtab::create(SectionRef &Section) {
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if (auto Err = Section.getContents(Data))
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return Err;
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Address = Section.getAddress();
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return std::error_code();
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}
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StringRef InstrProfSymtab::getFuncName(uint64_t Pointer, size_t Size) {
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if (Pointer < Address)
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return StringRef();
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auto Offset = Pointer - Address;
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if (Offset + Size > Data.size())
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return StringRef();
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return Data.substr(Pointer - Address, Size);
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}
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template <typename T, support::endianness Endian>
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static std::error_code readCoverageMappingData(
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InstrProfSymtab &ProfileNames, StringRef Data,
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std::vector<BinaryCoverageReader::ProfileMappingRecord> &Records,
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std::vector<StringRef> &Filenames) {
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using namespace support;
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llvm::DenseSet<T> UniqueFunctionMappingData;
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// Read the records in the coverage data section.
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for (const char *Buf = Data.data(), *End = Buf + Data.size(); Buf < End;) {
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if (Buf + sizeof(CovMapHeader) > End)
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return coveragemap_error::malformed;
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auto CovHeader = reinterpret_cast<const coverage::CovMapHeader *>(Buf);
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uint32_t NRecords = CovHeader->getNRecords<Endian>();
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uint32_t FilenamesSize = CovHeader->getFilenamesSize<Endian>();
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uint32_t CoverageSize = CovHeader->getCoverageSize<Endian>();
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uint32_t Version = CovHeader->getVersion<Endian>();
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Buf = reinterpret_cast<const char *>(++CovHeader);
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if (Version > coverage::CoverageMappingCurrentVersion)
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return coveragemap_error::unsupported_version;
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// Skip past the function records, saving the start and end for later.
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const char *FunBuf = Buf;
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Buf += NRecords * sizeof(coverage::CovMapFunctionRecord<T>);
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const char *FunEnd = Buf;
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// Get the filenames.
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if (Buf + FilenamesSize > End)
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return coveragemap_error::malformed;
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size_t FilenamesBegin = Filenames.size();
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RawCoverageFilenamesReader Reader(StringRef(Buf, FilenamesSize), Filenames);
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if (auto Err = Reader.read())
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return Err;
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Buf += FilenamesSize;
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// We'll read the coverage mapping records in the loop below.
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const char *CovBuf = Buf;
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Buf += CoverageSize;
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const char *CovEnd = Buf;
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if (Buf > End)
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return coveragemap_error::malformed;
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// Each coverage map has an alignment of 8, so we need to adjust alignment
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// before reading the next map.
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Buf += alignmentAdjustment(Buf, 8);
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auto CFR =
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reinterpret_cast<const coverage::CovMapFunctionRecord<T> *>(FunBuf);
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while ((const char *)CFR < FunEnd) {
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// Read the function information
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uint32_t DataSize = CFR->template getDataSize<Endian>();
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uint64_t FuncHash = CFR->template getFuncHash<Endian>();
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// Now use that to read the coverage data.
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if (CovBuf + DataSize > CovEnd)
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return coveragemap_error::malformed;
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auto Mapping = StringRef(CovBuf, DataSize);
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CovBuf += DataSize;
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// Ignore this record if we already have a record that points to the same
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// function name. This is useful to ignore the redundant records for the
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// functions with ODR linkage.
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T NameRef = CFR->template getFuncNameRef<Endian>();
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if (!UniqueFunctionMappingData.insert(NameRef).second)
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continue;
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StringRef FuncName;
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if (std::error_code EC =
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CFR->template getFuncName<Endian>(ProfileNames, FuncName))
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return EC;
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Records.push_back(BinaryCoverageReader::ProfileMappingRecord(
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CoverageMappingVersion(Version), FuncName, FuncHash, Mapping,
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FilenamesBegin, Filenames.size() - FilenamesBegin));
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CFR++;
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}
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}
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return std::error_code();
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}
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static const char *TestingFormatMagic = "llvmcovmtestdata";
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static std::error_code loadTestingFormat(StringRef Data,
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InstrProfSymtab &ProfileNames,
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StringRef &CoverageMapping,
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uint8_t &BytesInAddress,
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support::endianness &Endian) {
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BytesInAddress = 8;
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Endian = support::endianness::little;
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Data = Data.substr(StringRef(TestingFormatMagic).size());
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if (Data.size() < 1)
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return coveragemap_error::truncated;
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unsigned N = 0;
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auto ProfileNamesSize =
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decodeULEB128(reinterpret_cast<const uint8_t *>(Data.data()), &N);
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if (N > Data.size())
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return coveragemap_error::malformed;
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Data = Data.substr(N);
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if (Data.size() < 1)
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return coveragemap_error::truncated;
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N = 0;
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uint64_t Address =
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decodeULEB128(reinterpret_cast<const uint8_t *>(Data.data()), &N);
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if (N > Data.size())
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return coveragemap_error::malformed;
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Data = Data.substr(N);
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if (Data.size() < ProfileNamesSize)
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return coveragemap_error::malformed;
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ProfileNames.create(Data.substr(0, ProfileNamesSize), Address);
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CoverageMapping = Data.substr(ProfileNamesSize);
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return std::error_code();
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}
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static ErrorOr<SectionRef> lookupSection(ObjectFile &OF, StringRef Name) {
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StringRef FoundName;
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for (const auto &Section : OF.sections()) {
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if (auto EC = Section.getName(FoundName))
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return EC;
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if (FoundName == Name)
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return Section;
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}
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return coveragemap_error::no_data_found;
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}
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static std::error_code
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loadBinaryFormat(MemoryBufferRef ObjectBuffer, InstrProfSymtab &ProfileNames,
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StringRef &CoverageMapping, uint8_t &BytesInAddress,
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support::endianness &Endian, StringRef Arch) {
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auto BinOrErr = object::createBinary(ObjectBuffer);
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if (std::error_code EC = BinOrErr.getError())
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return EC;
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auto Bin = std::move(BinOrErr.get());
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std::unique_ptr<ObjectFile> OF;
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if (auto *Universal = dyn_cast<object::MachOUniversalBinary>(Bin.get())) {
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// If we have a universal binary, try to look up the object for the
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// appropriate architecture.
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auto ObjectFileOrErr = Universal->getObjectForArch(Arch);
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if (std::error_code EC = ObjectFileOrErr.getError())
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return EC;
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OF = std::move(ObjectFileOrErr.get());
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} else if (isa<object::ObjectFile>(Bin.get())) {
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// For any other object file, upcast and take ownership.
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OF.reset(cast<object::ObjectFile>(Bin.release()));
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// If we've asked for a particular arch, make sure they match.
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if (!Arch.empty() && OF->getArch() != Triple(Arch).getArch())
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return object_error::arch_not_found;
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} else
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// We can only handle object files.
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return coveragemap_error::malformed;
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// The coverage uses native pointer sizes for the object it's written in.
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BytesInAddress = OF->getBytesInAddress();
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Endian = OF->isLittleEndian() ? support::endianness::little
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: support::endianness::big;
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// Look for the sections that we are interested in.
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auto NamesSection = lookupSection(*OF, getInstrProfNameSectionName(false));
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if (auto EC = NamesSection.getError())
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return EC;
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auto CoverageSection =
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lookupSection(*OF, getInstrProfCoverageSectionName(false));
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if (auto EC = CoverageSection.getError())
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return EC;
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// Get the contents of the given sections.
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if (std::error_code EC = CoverageSection->getContents(CoverageMapping))
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return EC;
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if (std::error_code EC = ProfileNames.create(*NamesSection))
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return EC;
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return std::error_code();
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}
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ErrorOr<std::unique_ptr<BinaryCoverageReader>>
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BinaryCoverageReader::create(std::unique_ptr<MemoryBuffer> &ObjectBuffer,
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StringRef Arch) {
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std::unique_ptr<BinaryCoverageReader> Reader(new BinaryCoverageReader());
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InstrProfSymtab ProfileNames;
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StringRef Coverage;
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uint8_t BytesInAddress;
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support::endianness Endian;
|
|
std::error_code EC;
|
|
if (ObjectBuffer->getBuffer().startswith(TestingFormatMagic))
|
|
// This is a special format used for testing.
|
|
EC = loadTestingFormat(ObjectBuffer->getBuffer(), ProfileNames, Coverage,
|
|
BytesInAddress, Endian);
|
|
else
|
|
EC = loadBinaryFormat(ObjectBuffer->getMemBufferRef(), ProfileNames,
|
|
Coverage, BytesInAddress, Endian, Arch);
|
|
if (EC)
|
|
return EC;
|
|
|
|
if (BytesInAddress == 4 && Endian == support::endianness::little)
|
|
EC = readCoverageMappingData<uint32_t, support::endianness::little>(
|
|
ProfileNames, Coverage, Reader->MappingRecords, Reader->Filenames);
|
|
else if (BytesInAddress == 4 && Endian == support::endianness::big)
|
|
EC = readCoverageMappingData<uint32_t, support::endianness::big>(
|
|
ProfileNames, Coverage, Reader->MappingRecords, Reader->Filenames);
|
|
else if (BytesInAddress == 8 && Endian == support::endianness::little)
|
|
EC = readCoverageMappingData<uint64_t, support::endianness::little>(
|
|
ProfileNames, Coverage, Reader->MappingRecords, Reader->Filenames);
|
|
else if (BytesInAddress == 8 && Endian == support::endianness::big)
|
|
EC = readCoverageMappingData<uint64_t, support::endianness::big>(
|
|
ProfileNames, Coverage, Reader->MappingRecords, Reader->Filenames);
|
|
else
|
|
return coveragemap_error::malformed;
|
|
if (EC)
|
|
return EC;
|
|
return std::move(Reader);
|
|
}
|
|
|
|
std::error_code
|
|
BinaryCoverageReader::readNextRecord(CoverageMappingRecord &Record) {
|
|
if (CurrentRecord >= MappingRecords.size())
|
|
return coveragemap_error::eof;
|
|
|
|
FunctionsFilenames.clear();
|
|
Expressions.clear();
|
|
MappingRegions.clear();
|
|
auto &R = MappingRecords[CurrentRecord];
|
|
RawCoverageMappingReader Reader(
|
|
R.CoverageMapping,
|
|
makeArrayRef(Filenames).slice(R.FilenamesBegin, R.FilenamesSize),
|
|
FunctionsFilenames, Expressions, MappingRegions);
|
|
if (auto Err = Reader.read())
|
|
return Err;
|
|
|
|
Record.FunctionName = R.FunctionName;
|
|
Record.FunctionHash = R.FunctionHash;
|
|
Record.Filenames = FunctionsFilenames;
|
|
Record.Expressions = Expressions;
|
|
Record.MappingRegions = MappingRegions;
|
|
|
|
++CurrentRecord;
|
|
return std::error_code();
|
|
}
|