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When writing a coverage mapping we iterate through the mapping regions in order of FileID, but we were then repeatedly searching from the beginning of the list to count the number of regions with a given FileID. It is simpler and more efficient to search forward from the current iterator to find the number of regions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218842 91177308-0d34-0410-b5e6-96231b3b80d8
188 lines
6.7 KiB
C++
188 lines
6.7 KiB
C++
//=-- CoverageMappingWriter.cpp - Code coverage mapping writer -------------=//
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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 writing 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/CoverageMappingWriter.h"
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#include "llvm/Support/LEB128.h"
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using namespace llvm;
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using namespace coverage;
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void CoverageFilenamesSectionWriter::write(raw_ostream &OS) {
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encodeULEB128(Filenames.size(), OS);
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for (const auto &Filename : Filenames) {
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encodeULEB128(Filename.size(), OS);
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OS << Filename;
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}
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}
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namespace {
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/// \brief Gather only the expressions that are used by the mapping
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/// regions in this function.
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class CounterExpressionsMinimizer {
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ArrayRef<CounterExpression> Expressions;
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llvm::SmallVector<CounterExpression, 16> UsedExpressions;
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std::vector<unsigned> AdjustedExpressionIDs;
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public:
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void mark(Counter C) {
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if (!C.isExpression())
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return;
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unsigned ID = C.getExpressionID();
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AdjustedExpressionIDs[ID] = 1;
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mark(Expressions[ID].LHS);
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mark(Expressions[ID].RHS);
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}
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void gatherUsed(Counter C) {
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if (!C.isExpression() || !AdjustedExpressionIDs[C.getExpressionID()])
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return;
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AdjustedExpressionIDs[C.getExpressionID()] = UsedExpressions.size();
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const auto &E = Expressions[C.getExpressionID()];
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UsedExpressions.push_back(E);
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gatherUsed(E.LHS);
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gatherUsed(E.RHS);
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}
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CounterExpressionsMinimizer(ArrayRef<CounterExpression> Expressions,
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ArrayRef<CounterMappingRegion> MappingRegions)
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: Expressions(Expressions) {
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AdjustedExpressionIDs.resize(Expressions.size(), 0);
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for (const auto &I : MappingRegions)
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mark(I.Count);
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for (const auto &I : MappingRegions)
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gatherUsed(I.Count);
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}
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ArrayRef<CounterExpression> getExpressions() const { return UsedExpressions; }
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/// \brief Adjust the given counter to correctly transition from the old
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/// expression ids to the new expression ids.
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Counter adjust(Counter C) const {
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if (C.isExpression())
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C = Counter::getExpression(AdjustedExpressionIDs[C.getExpressionID()]);
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return C;
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}
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};
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}
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/// \brief Encode the counter.
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///
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/// The encoding uses the following format:
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/// Low 2 bits - Tag:
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/// Counter::Zero(0) - A Counter with kind Counter::Zero
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/// Counter::CounterValueReference(1) - A counter with kind
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/// Counter::CounterValueReference
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/// Counter::Expression(2) + CounterExpression::Subtract(0) -
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/// A counter with kind Counter::Expression and an expression
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/// with kind CounterExpression::Subtract
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/// Counter::Expression(2) + CounterExpression::Add(1) -
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/// A counter with kind Counter::Expression and an expression
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/// with kind CounterExpression::Add
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/// Remaining bits - Counter/Expression ID.
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static unsigned encodeCounter(ArrayRef<CounterExpression> Expressions,
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Counter C) {
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unsigned Tag = unsigned(C.getKind());
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if (C.isExpression())
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Tag += Expressions[C.getExpressionID()].Kind;
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unsigned ID = C.getCounterID();
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assert(ID <=
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(std::numeric_limits<unsigned>::max() >> Counter::EncodingTagBits));
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return Tag | (ID << Counter::EncodingTagBits);
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}
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static void writeCounter(ArrayRef<CounterExpression> Expressions, Counter C,
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raw_ostream &OS) {
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encodeULEB128(encodeCounter(Expressions, C), OS);
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}
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void CoverageMappingWriter::write(raw_ostream &OS) {
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// Sort the regions in an ascending order by the file id and the starting
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// location.
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std::sort(MappingRegions.begin(), MappingRegions.end());
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// Write out the fileid -> filename mapping.
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encodeULEB128(VirtualFileMapping.size(), OS);
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for (const auto &FileID : VirtualFileMapping)
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encodeULEB128(FileID, OS);
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// Write out the expressions.
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CounterExpressionsMinimizer Minimizer(Expressions, MappingRegions);
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auto MinExpressions = Minimizer.getExpressions();
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encodeULEB128(MinExpressions.size(), OS);
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for (const auto &E : MinExpressions) {
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writeCounter(MinExpressions, Minimizer.adjust(E.LHS), OS);
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writeCounter(MinExpressions, Minimizer.adjust(E.RHS), OS);
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}
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// Write out the mapping regions.
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// Split the regions into subarrays where each region in a
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// subarray has a fileID which is the index of that subarray.
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unsigned PrevLineStart = 0;
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unsigned CurrentFileID = ~0U;
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for (auto I = MappingRegions.begin(), E = MappingRegions.end(); I != E; ++I) {
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if (I->FileID != CurrentFileID) {
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// Ensure that all file ids have at least one mapping region.
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assert(I->FileID == (CurrentFileID + 1));
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// Find the number of regions with this file id.
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unsigned RegionCount = 1;
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for (auto J = I + 1; J != E && I->FileID == J->FileID; ++J)
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++RegionCount;
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// Start a new region sub-array.
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encodeULEB128(RegionCount, OS);
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CurrentFileID = I->FileID;
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PrevLineStart = 0;
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}
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Counter Count = Minimizer.adjust(I->Count);
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switch (I->Kind) {
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case CounterMappingRegion::CodeRegion:
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writeCounter(MinExpressions, Count, OS);
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break;
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case CounterMappingRegion::ExpansionRegion: {
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assert(Count.isZero());
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assert(I->ExpandedFileID <=
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(std::numeric_limits<unsigned>::max() >>
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Counter::EncodingCounterTagAndExpansionRegionTagBits));
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// Mark an expansion region with a set bit that follows the counter tag,
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// and pack the expanded file id into the remaining bits.
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unsigned EncodedTagExpandedFileID =
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(1 << Counter::EncodingTagBits) |
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(I->ExpandedFileID
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<< Counter::EncodingCounterTagAndExpansionRegionTagBits);
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encodeULEB128(EncodedTagExpandedFileID, OS);
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break;
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}
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case CounterMappingRegion::SkippedRegion:
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assert(Count.isZero());
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encodeULEB128(unsigned(I->Kind)
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<< Counter::EncodingCounterTagAndExpansionRegionTagBits,
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OS);
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break;
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}
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assert(I->LineStart >= PrevLineStart);
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encodeULEB128(I->LineStart - PrevLineStart, OS);
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uint64_t CodeBeforeColumnStart =
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uint64_t(I->HasCodeBefore) |
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(uint64_t(I->ColumnStart)
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<< CounterMappingRegion::EncodingHasCodeBeforeBits);
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encodeULEB128(CodeBeforeColumnStart, OS);
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assert(I->LineEnd >= I->LineStart);
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encodeULEB128(I->LineEnd - I->LineStart, OS);
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encodeULEB128(I->ColumnEnd, OS);
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PrevLineStart = I->LineStart;
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}
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// Ensure that all file ids have at least one mapping region.
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assert(CurrentFileID == (VirtualFileMapping.size() - 1));
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}
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