| //===--- CoverageMappingGen.cpp - Coverage mapping generation ---*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Instrumentation-based code coverage mapping generator |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CoverageMappingGen.h" |
| #include "CodeGenFunction.h" |
| #include "clang/AST/StmtVisitor.h" |
| #include "clang/Lex/Lexer.h" |
| #include "llvm/ADT/SmallSet.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/Optional.h" |
| #include "llvm/ProfileData/Coverage/CoverageMapping.h" |
| #include "llvm/ProfileData/Coverage/CoverageMappingReader.h" |
| #include "llvm/ProfileData/Coverage/CoverageMappingWriter.h" |
| #include "llvm/ProfileData/InstrProfReader.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/Path.h" |
| |
| using namespace clang; |
| using namespace CodeGen; |
| using namespace llvm::coverage; |
| |
| void CoverageSourceInfo::SourceRangeSkipped(SourceRange Range) { |
| SkippedRanges.push_back(Range); |
| } |
| |
| namespace { |
| |
| /// \brief A region of source code that can be mapped to a counter. |
| class SourceMappingRegion { |
| Counter Count; |
| |
| /// \brief The region's starting location. |
| Optional<SourceLocation> LocStart; |
| |
| /// \brief The region's ending location. |
| Optional<SourceLocation> LocEnd; |
| |
| public: |
| SourceMappingRegion(Counter Count, Optional<SourceLocation> LocStart, |
| Optional<SourceLocation> LocEnd) |
| : Count(Count), LocStart(LocStart), LocEnd(LocEnd) {} |
| |
| const Counter &getCounter() const { return Count; } |
| |
| void setCounter(Counter C) { Count = C; } |
| |
| bool hasStartLoc() const { return LocStart.hasValue(); } |
| |
| void setStartLoc(SourceLocation Loc) { LocStart = Loc; } |
| |
| SourceLocation getStartLoc() const { |
| assert(LocStart && "Region has no start location"); |
| return *LocStart; |
| } |
| |
| bool hasEndLoc() const { return LocEnd.hasValue(); } |
| |
| void setEndLoc(SourceLocation Loc) { LocEnd = Loc; } |
| |
| SourceLocation getEndLoc() const { |
| assert(LocEnd && "Region has no end location"); |
| return *LocEnd; |
| } |
| }; |
| |
| /// \brief Provides the common functionality for the different |
| /// coverage mapping region builders. |
| class CoverageMappingBuilder { |
| public: |
| CoverageMappingModuleGen &CVM; |
| SourceManager &SM; |
| const LangOptions &LangOpts; |
| |
| private: |
| /// \brief Map of clang's FileIDs to IDs used for coverage mapping. |
| llvm::SmallDenseMap<FileID, std::pair<unsigned, SourceLocation>, 8> |
| FileIDMapping; |
| |
| public: |
| /// \brief The coverage mapping regions for this function |
| llvm::SmallVector<CounterMappingRegion, 32> MappingRegions; |
| /// \brief The source mapping regions for this function. |
| std::vector<SourceMappingRegion> SourceRegions; |
| |
| /// \brief A set of regions which can be used as a filter. |
| /// |
| /// It is produced by emitExpansionRegions() and is used in |
| /// emitSourceRegions() to suppress producing code regions if |
| /// the same area is covered by expansion regions. |
| typedef llvm::SmallSet<std::pair<SourceLocation, SourceLocation>, 8> |
| SourceRegionFilter; |
| |
| CoverageMappingBuilder(CoverageMappingModuleGen &CVM, SourceManager &SM, |
| const LangOptions &LangOpts) |
| : CVM(CVM), SM(SM), LangOpts(LangOpts) {} |
| |
| /// \brief Return the precise end location for the given token. |
| SourceLocation getPreciseTokenLocEnd(SourceLocation Loc) { |
| // We avoid getLocForEndOfToken here, because it doesn't do what we want for |
| // macro locations, which we just treat as expanded files. |
| unsigned TokLen = |
| Lexer::MeasureTokenLength(SM.getSpellingLoc(Loc), SM, LangOpts); |
| return Loc.getLocWithOffset(TokLen); |
| } |
| |
| /// \brief Return the start location of an included file or expanded macro. |
| SourceLocation getStartOfFileOrMacro(SourceLocation Loc) { |
| if (Loc.isMacroID()) |
| return Loc.getLocWithOffset(-SM.getFileOffset(Loc)); |
| return SM.getLocForStartOfFile(SM.getFileID(Loc)); |
| } |
| |
| /// \brief Return the end location of an included file or expanded macro. |
| SourceLocation getEndOfFileOrMacro(SourceLocation Loc) { |
| if (Loc.isMacroID()) |
| return Loc.getLocWithOffset(SM.getFileIDSize(SM.getFileID(Loc)) - |
| SM.getFileOffset(Loc)); |
| return SM.getLocForEndOfFile(SM.getFileID(Loc)); |
| } |
| |
| /// \brief Find out where the current file is included or macro is expanded. |
| SourceLocation getIncludeOrExpansionLoc(SourceLocation Loc) { |
| return Loc.isMacroID() ? SM.getImmediateExpansionRange(Loc).first |
| : SM.getIncludeLoc(SM.getFileID(Loc)); |
| } |
| |
| /// \brief Return true if \c Loc is a location in a built-in macro. |
| bool isInBuiltin(SourceLocation Loc) { |
| return SM.getBufferName(SM.getSpellingLoc(Loc)) == "<built-in>"; |
| } |
| |
| /// \brief Check whether \c Loc is included or expanded from \c Parent. |
| bool isNestedIn(SourceLocation Loc, FileID Parent) { |
| do { |
| Loc = getIncludeOrExpansionLoc(Loc); |
| if (Loc.isInvalid()) |
| return false; |
| } while (!SM.isInFileID(Loc, Parent)); |
| return true; |
| } |
| |
| /// \brief Get the start of \c S ignoring macro arguments and builtin macros. |
| SourceLocation getStart(const Stmt *S) { |
| SourceLocation Loc = S->getLocStart(); |
| while (SM.isMacroArgExpansion(Loc) || isInBuiltin(Loc)) |
| Loc = SM.getImmediateExpansionRange(Loc).first; |
| return Loc; |
| } |
| |
| /// \brief Get the end of \c S ignoring macro arguments and builtin macros. |
| SourceLocation getEnd(const Stmt *S) { |
| SourceLocation Loc = S->getLocEnd(); |
| while (SM.isMacroArgExpansion(Loc) || isInBuiltin(Loc)) |
| Loc = SM.getImmediateExpansionRange(Loc).first; |
| return getPreciseTokenLocEnd(Loc); |
| } |
| |
| /// \brief Find the set of files we have regions for and assign IDs |
| /// |
| /// Fills \c Mapping with the virtual file mapping needed to write out |
| /// coverage and collects the necessary file information to emit source and |
| /// expansion regions. |
| void gatherFileIDs(SmallVectorImpl<unsigned> &Mapping) { |
| FileIDMapping.clear(); |
| |
| llvm::SmallSet<FileID, 8> Visited; |
| SmallVector<std::pair<SourceLocation, unsigned>, 8> FileLocs; |
| for (const auto &Region : SourceRegions) { |
| SourceLocation Loc = Region.getStartLoc(); |
| FileID File = SM.getFileID(Loc); |
| if (!Visited.insert(File).second) |
| continue; |
| |
| // Do not map FileID's associated with system headers. |
| if (SM.isInSystemHeader(SM.getSpellingLoc(Loc))) |
| continue; |
| |
| unsigned Depth = 0; |
| for (SourceLocation Parent = getIncludeOrExpansionLoc(Loc); |
| Parent.isValid(); Parent = getIncludeOrExpansionLoc(Parent)) |
| ++Depth; |
| FileLocs.push_back(std::make_pair(Loc, Depth)); |
| } |
| std::stable_sort(FileLocs.begin(), FileLocs.end(), llvm::less_second()); |
| |
| for (const auto &FL : FileLocs) { |
| SourceLocation Loc = FL.first; |
| FileID SpellingFile = SM.getDecomposedSpellingLoc(Loc).first; |
| auto Entry = SM.getFileEntryForID(SpellingFile); |
| if (!Entry) |
| continue; |
| |
| FileIDMapping[SM.getFileID(Loc)] = std::make_pair(Mapping.size(), Loc); |
| Mapping.push_back(CVM.getFileID(Entry)); |
| } |
| } |
| |
| /// \brief Get the coverage mapping file ID for \c Loc. |
| /// |
| /// If such file id doesn't exist, return None. |
| Optional<unsigned> getCoverageFileID(SourceLocation Loc) { |
| auto Mapping = FileIDMapping.find(SM.getFileID(Loc)); |
| if (Mapping != FileIDMapping.end()) |
| return Mapping->second.first; |
| return None; |
| } |
| |
| /// \brief Gather all the regions that were skipped by the preprocessor |
| /// using the constructs like #if. |
| void gatherSkippedRegions() { |
| /// An array of the minimum lineStarts and the maximum lineEnds |
| /// for mapping regions from the appropriate source files. |
| llvm::SmallVector<std::pair<unsigned, unsigned>, 8> FileLineRanges; |
| FileLineRanges.resize( |
| FileIDMapping.size(), |
| std::make_pair(std::numeric_limits<unsigned>::max(), 0)); |
| for (const auto &R : MappingRegions) { |
| FileLineRanges[R.FileID].first = |
| std::min(FileLineRanges[R.FileID].first, R.LineStart); |
| FileLineRanges[R.FileID].second = |
| std::max(FileLineRanges[R.FileID].second, R.LineEnd); |
| } |
| |
| auto SkippedRanges = CVM.getSourceInfo().getSkippedRanges(); |
| for (const auto &I : SkippedRanges) { |
| auto LocStart = I.getBegin(); |
| auto LocEnd = I.getEnd(); |
| assert(SM.isWrittenInSameFile(LocStart, LocEnd) && |
| "region spans multiple files"); |
| |
| auto CovFileID = getCoverageFileID(LocStart); |
| if (!CovFileID) |
| continue; |
| unsigned LineStart = SM.getSpellingLineNumber(LocStart); |
| unsigned ColumnStart = SM.getSpellingColumnNumber(LocStart); |
| unsigned LineEnd = SM.getSpellingLineNumber(LocEnd); |
| unsigned ColumnEnd = SM.getSpellingColumnNumber(LocEnd); |
| auto Region = CounterMappingRegion::makeSkipped( |
| *CovFileID, LineStart, ColumnStart, LineEnd, ColumnEnd); |
| // Make sure that we only collect the regions that are inside |
| // the souce code of this function. |
| if (Region.LineStart >= FileLineRanges[*CovFileID].first && |
| Region.LineEnd <= FileLineRanges[*CovFileID].second) |
| MappingRegions.push_back(Region); |
| } |
| } |
| |
| /// \brief Generate the coverage counter mapping regions from collected |
| /// source regions. |
| void emitSourceRegions(const SourceRegionFilter &Filter) { |
| for (const auto &Region : SourceRegions) { |
| assert(Region.hasEndLoc() && "incomplete region"); |
| |
| SourceLocation LocStart = Region.getStartLoc(); |
| assert(SM.getFileID(LocStart).isValid() && "region in invalid file"); |
| |
| // Ignore regions from system headers. |
| if (SM.isInSystemHeader(SM.getSpellingLoc(LocStart))) |
| continue; |
| |
| auto CovFileID = getCoverageFileID(LocStart); |
| // Ignore regions that don't have a file, such as builtin macros. |
| if (!CovFileID) |
| continue; |
| |
| SourceLocation LocEnd = Region.getEndLoc(); |
| assert(SM.isWrittenInSameFile(LocStart, LocEnd) && |
| "region spans multiple files"); |
| |
| // Don't add code regions for the area covered by expansion regions. |
| // This not only suppresses redundant regions, but sometimes prevents |
| // creating regions with wrong counters if, for example, a statement's |
| // body ends at the end of a nested macro. |
| if (Filter.count(std::make_pair(LocStart, LocEnd))) |
| continue; |
| |
| // Find the spilling locations for the mapping region. |
| unsigned LineStart = SM.getSpellingLineNumber(LocStart); |
| unsigned ColumnStart = SM.getSpellingColumnNumber(LocStart); |
| unsigned LineEnd = SM.getSpellingLineNumber(LocEnd); |
| unsigned ColumnEnd = SM.getSpellingColumnNumber(LocEnd); |
| |
| assert(LineStart <= LineEnd && "region start and end out of order"); |
| MappingRegions.push_back(CounterMappingRegion::makeRegion( |
| Region.getCounter(), *CovFileID, LineStart, ColumnStart, LineEnd, |
| ColumnEnd)); |
| } |
| } |
| |
| /// \brief Generate expansion regions for each virtual file we've seen. |
| SourceRegionFilter emitExpansionRegions() { |
| SourceRegionFilter Filter; |
| for (const auto &FM : FileIDMapping) { |
| SourceLocation ExpandedLoc = FM.second.second; |
| SourceLocation ParentLoc = getIncludeOrExpansionLoc(ExpandedLoc); |
| if (ParentLoc.isInvalid()) |
| continue; |
| |
| auto ParentFileID = getCoverageFileID(ParentLoc); |
| if (!ParentFileID) |
| continue; |
| auto ExpandedFileID = getCoverageFileID(ExpandedLoc); |
| assert(ExpandedFileID && "expansion in uncovered file"); |
| |
| SourceLocation LocEnd = getPreciseTokenLocEnd(ParentLoc); |
| assert(SM.isWrittenInSameFile(ParentLoc, LocEnd) && |
| "region spans multiple files"); |
| Filter.insert(std::make_pair(ParentLoc, LocEnd)); |
| |
| unsigned LineStart = SM.getSpellingLineNumber(ParentLoc); |
| unsigned ColumnStart = SM.getSpellingColumnNumber(ParentLoc); |
| unsigned LineEnd = SM.getSpellingLineNumber(LocEnd); |
| unsigned ColumnEnd = SM.getSpellingColumnNumber(LocEnd); |
| |
| MappingRegions.push_back(CounterMappingRegion::makeExpansion( |
| *ParentFileID, *ExpandedFileID, LineStart, ColumnStart, LineEnd, |
| ColumnEnd)); |
| } |
| return Filter; |
| } |
| }; |
| |
| /// \brief Creates unreachable coverage regions for the functions that |
| /// are not emitted. |
| struct EmptyCoverageMappingBuilder : public CoverageMappingBuilder { |
| EmptyCoverageMappingBuilder(CoverageMappingModuleGen &CVM, SourceManager &SM, |
| const LangOptions &LangOpts) |
| : CoverageMappingBuilder(CVM, SM, LangOpts) {} |
| |
| void VisitDecl(const Decl *D) { |
| if (!D->hasBody()) |
| return; |
| auto Body = D->getBody(); |
| SourceLocation Start = getStart(Body); |
| SourceLocation End = getEnd(Body); |
| if (!SM.isWrittenInSameFile(Start, End)) { |
| // Walk up to find the common ancestor. |
| // Correct the locations accordingly. |
| FileID StartFileID = SM.getFileID(Start); |
| FileID EndFileID = SM.getFileID(End); |
| while (StartFileID != EndFileID && !isNestedIn(End, StartFileID)) { |
| Start = getIncludeOrExpansionLoc(Start); |
| assert(Start.isValid() && |
| "Declaration start location not nested within a known region"); |
| StartFileID = SM.getFileID(Start); |
| } |
| while (StartFileID != EndFileID) { |
| End = getPreciseTokenLocEnd(getIncludeOrExpansionLoc(End)); |
| assert(End.isValid() && |
| "Declaration end location not nested within a known region"); |
| EndFileID = SM.getFileID(End); |
| } |
| } |
| SourceRegions.emplace_back(Counter(), Start, End); |
| } |
| |
| /// \brief Write the mapping data to the output stream |
| void write(llvm::raw_ostream &OS) { |
| SmallVector<unsigned, 16> FileIDMapping; |
| gatherFileIDs(FileIDMapping); |
| emitSourceRegions(SourceRegionFilter()); |
| |
| if (MappingRegions.empty()) |
| return; |
| |
| CoverageMappingWriter Writer(FileIDMapping, None, MappingRegions); |
| Writer.write(OS); |
| } |
| }; |
| |
| /// \brief A StmtVisitor that creates coverage mapping regions which map |
| /// from the source code locations to the PGO counters. |
| struct CounterCoverageMappingBuilder |
| : public CoverageMappingBuilder, |
| public ConstStmtVisitor<CounterCoverageMappingBuilder> { |
| /// \brief The map of statements to count values. |
| llvm::DenseMap<const Stmt *, unsigned> &CounterMap; |
| |
| /// \brief A stack of currently live regions. |
| std::vector<SourceMappingRegion> RegionStack; |
| |
| CounterExpressionBuilder Builder; |
| |
| /// \brief A location in the most recently visited file or macro. |
| /// |
| /// This is used to adjust the active source regions appropriately when |
| /// expressions cross file or macro boundaries. |
| SourceLocation MostRecentLocation; |
| |
| /// \brief Return a counter for the subtraction of \c RHS from \c LHS |
| Counter subtractCounters(Counter LHS, Counter RHS) { |
| return Builder.subtract(LHS, RHS); |
| } |
| |
| /// \brief Return a counter for the sum of \c LHS and \c RHS. |
| Counter addCounters(Counter LHS, Counter RHS) { |
| return Builder.add(LHS, RHS); |
| } |
| |
| Counter addCounters(Counter C1, Counter C2, Counter C3) { |
| return addCounters(addCounters(C1, C2), C3); |
| } |
| |
| /// \brief Return the region counter for the given statement. |
| /// |
| /// This should only be called on statements that have a dedicated counter. |
| Counter getRegionCounter(const Stmt *S) { |
| return Counter::getCounter(CounterMap[S]); |
| } |
| |
| /// \brief Push a region onto the stack. |
| /// |
| /// Returns the index on the stack where the region was pushed. This can be |
| /// used with popRegions to exit a "scope", ending the region that was pushed. |
| size_t pushRegion(Counter Count, Optional<SourceLocation> StartLoc = None, |
| Optional<SourceLocation> EndLoc = None) { |
| if (StartLoc) |
| MostRecentLocation = *StartLoc; |
| RegionStack.emplace_back(Count, StartLoc, EndLoc); |
| |
| return RegionStack.size() - 1; |
| } |
| |
| /// \brief Pop regions from the stack into the function's list of regions. |
| /// |
| /// Adds all regions from \c ParentIndex to the top of the stack to the |
| /// function's \c SourceRegions. |
| void popRegions(size_t ParentIndex) { |
| assert(RegionStack.size() >= ParentIndex && "parent not in stack"); |
| while (RegionStack.size() > ParentIndex) { |
| SourceMappingRegion &Region = RegionStack.back(); |
| if (Region.hasStartLoc()) { |
| SourceLocation StartLoc = Region.getStartLoc(); |
| SourceLocation EndLoc = Region.hasEndLoc() |
| ? Region.getEndLoc() |
| : RegionStack[ParentIndex].getEndLoc(); |
| while (!SM.isWrittenInSameFile(StartLoc, EndLoc)) { |
| // The region ends in a nested file or macro expansion. Create a |
| // separate region for each expansion. |
| SourceLocation NestedLoc = getStartOfFileOrMacro(EndLoc); |
| assert(SM.isWrittenInSameFile(NestedLoc, EndLoc)); |
| |
| if (!isRegionAlreadyAdded(NestedLoc, EndLoc)) |
| SourceRegions.emplace_back(Region.getCounter(), NestedLoc, EndLoc); |
| |
| EndLoc = getPreciseTokenLocEnd(getIncludeOrExpansionLoc(EndLoc)); |
| if (EndLoc.isInvalid()) |
| llvm::report_fatal_error("File exit not handled before popRegions"); |
| } |
| Region.setEndLoc(EndLoc); |
| |
| MostRecentLocation = EndLoc; |
| // If this region happens to span an entire expansion, we need to make |
| // sure we don't overlap the parent region with it. |
| if (StartLoc == getStartOfFileOrMacro(StartLoc) && |
| EndLoc == getEndOfFileOrMacro(EndLoc)) |
| MostRecentLocation = getIncludeOrExpansionLoc(EndLoc); |
| |
| assert(SM.isWrittenInSameFile(Region.getStartLoc(), EndLoc)); |
| SourceRegions.push_back(Region); |
| } |
| RegionStack.pop_back(); |
| } |
| } |
| |
| /// \brief Return the currently active region. |
| SourceMappingRegion &getRegion() { |
| assert(!RegionStack.empty() && "statement has no region"); |
| return RegionStack.back(); |
| } |
| |
| /// \brief Propagate counts through the children of \c S. |
| Counter propagateCounts(Counter TopCount, const Stmt *S) { |
| size_t Index = pushRegion(TopCount, getStart(S), getEnd(S)); |
| Visit(S); |
| Counter ExitCount = getRegion().getCounter(); |
| popRegions(Index); |
| |
| // The statement may be spanned by an expansion. Make sure we handle a file |
| // exit out of this expansion before moving to the next statement. |
| if (SM.isBeforeInTranslationUnit(getStart(S), S->getLocStart())) |
| MostRecentLocation = getEnd(S); |
| |
| return ExitCount; |
| } |
| |
| /// \brief Check whether a region with bounds \c StartLoc and \c EndLoc |
| /// is already added to \c SourceRegions. |
| bool isRegionAlreadyAdded(SourceLocation StartLoc, SourceLocation EndLoc) { |
| return SourceRegions.rend() != |
| std::find_if(SourceRegions.rbegin(), SourceRegions.rend(), |
| [&](const SourceMappingRegion &Region) { |
| return Region.getStartLoc() == StartLoc && |
| Region.getEndLoc() == EndLoc; |
| }); |
| } |
| |
| /// \brief Adjust the most recently visited location to \c EndLoc. |
| /// |
| /// This should be used after visiting any statements in non-source order. |
| void adjustForOutOfOrderTraversal(SourceLocation EndLoc) { |
| MostRecentLocation = EndLoc; |
| // The code region for a whole macro is created in handleFileExit() when |
| // it detects exiting of the virtual file of that macro. If we visited |
| // statements in non-source order, we might already have such a region |
| // added, for example, if a body of a loop is divided among multiple |
| // macros. Avoid adding duplicate regions in such case. |
| if (getRegion().hasEndLoc() && |
| MostRecentLocation == getEndOfFileOrMacro(MostRecentLocation) && |
| isRegionAlreadyAdded(getStartOfFileOrMacro(MostRecentLocation), |
| MostRecentLocation)) |
| MostRecentLocation = getIncludeOrExpansionLoc(MostRecentLocation); |
| } |
| |
| /// \brief Adjust regions and state when \c NewLoc exits a file. |
| /// |
| /// If moving from our most recently tracked location to \c NewLoc exits any |
| /// files, this adjusts our current region stack and creates the file regions |
| /// for the exited file. |
| void handleFileExit(SourceLocation NewLoc) { |
| if (NewLoc.isInvalid() || |
| SM.isWrittenInSameFile(MostRecentLocation, NewLoc)) |
| return; |
| |
| // If NewLoc is not in a file that contains MostRecentLocation, walk up to |
| // find the common ancestor. |
| SourceLocation LCA = NewLoc; |
| FileID ParentFile = SM.getFileID(LCA); |
| while (!isNestedIn(MostRecentLocation, ParentFile)) { |
| LCA = getIncludeOrExpansionLoc(LCA); |
| if (LCA.isInvalid() || SM.isWrittenInSameFile(LCA, MostRecentLocation)) { |
| // Since there isn't a common ancestor, no file was exited. We just need |
| // to adjust our location to the new file. |
| MostRecentLocation = NewLoc; |
| return; |
| } |
| ParentFile = SM.getFileID(LCA); |
| } |
| |
| llvm::SmallSet<SourceLocation, 8> StartLocs; |
| Optional<Counter> ParentCounter; |
| for (SourceMappingRegion &I : llvm::reverse(RegionStack)) { |
| if (!I.hasStartLoc()) |
| continue; |
| SourceLocation Loc = I.getStartLoc(); |
| if (!isNestedIn(Loc, ParentFile)) { |
| ParentCounter = I.getCounter(); |
| break; |
| } |
| |
| while (!SM.isInFileID(Loc, ParentFile)) { |
| // The most nested region for each start location is the one with the |
| // correct count. We avoid creating redundant regions by stopping once |
| // we've seen this region. |
| if (StartLocs.insert(Loc).second) |
| SourceRegions.emplace_back(I.getCounter(), Loc, |
| getEndOfFileOrMacro(Loc)); |
| Loc = getIncludeOrExpansionLoc(Loc); |
| } |
| I.setStartLoc(getPreciseTokenLocEnd(Loc)); |
| } |
| |
| if (ParentCounter) { |
| // If the file is contained completely by another region and doesn't |
| // immediately start its own region, the whole file gets a region |
| // corresponding to the parent. |
| SourceLocation Loc = MostRecentLocation; |
| while (isNestedIn(Loc, ParentFile)) { |
| SourceLocation FileStart = getStartOfFileOrMacro(Loc); |
| if (StartLocs.insert(FileStart).second) |
| SourceRegions.emplace_back(*ParentCounter, FileStart, |
| getEndOfFileOrMacro(Loc)); |
| Loc = getIncludeOrExpansionLoc(Loc); |
| } |
| } |
| |
| MostRecentLocation = NewLoc; |
| } |
| |
| /// \brief Ensure that \c S is included in the current region. |
| void extendRegion(const Stmt *S) { |
| SourceMappingRegion &Region = getRegion(); |
| SourceLocation StartLoc = getStart(S); |
| |
| handleFileExit(StartLoc); |
| if (!Region.hasStartLoc()) |
| Region.setStartLoc(StartLoc); |
| } |
| |
| /// \brief Mark \c S as a terminator, starting a zero region. |
| void terminateRegion(const Stmt *S) { |
| extendRegion(S); |
| SourceMappingRegion &Region = getRegion(); |
| if (!Region.hasEndLoc()) |
| Region.setEndLoc(getEnd(S)); |
| pushRegion(Counter::getZero()); |
| } |
| |
| /// \brief Keep counts of breaks and continues inside loops. |
| struct BreakContinue { |
| Counter BreakCount; |
| Counter ContinueCount; |
| }; |
| SmallVector<BreakContinue, 8> BreakContinueStack; |
| |
| CounterCoverageMappingBuilder( |
| CoverageMappingModuleGen &CVM, |
| llvm::DenseMap<const Stmt *, unsigned> &CounterMap, SourceManager &SM, |
| const LangOptions &LangOpts) |
| : CoverageMappingBuilder(CVM, SM, LangOpts), CounterMap(CounterMap) {} |
| |
| /// \brief Write the mapping data to the output stream |
| void write(llvm::raw_ostream &OS) { |
| llvm::SmallVector<unsigned, 8> VirtualFileMapping; |
| gatherFileIDs(VirtualFileMapping); |
| SourceRegionFilter Filter = emitExpansionRegions(); |
| emitSourceRegions(Filter); |
| gatherSkippedRegions(); |
| |
| if (MappingRegions.empty()) |
| return; |
| |
| CoverageMappingWriter Writer(VirtualFileMapping, Builder.getExpressions(), |
| MappingRegions); |
| Writer.write(OS); |
| } |
| |
| void VisitStmt(const Stmt *S) { |
| if (S->getLocStart().isValid()) |
| extendRegion(S); |
| for (const Stmt *Child : S->children()) |
| if (Child) |
| this->Visit(Child); |
| handleFileExit(getEnd(S)); |
| } |
| |
| void VisitDecl(const Decl *D) { |
| Stmt *Body = D->getBody(); |
| |
| // Do not propagate region counts into system headers. |
| if (Body && SM.isInSystemHeader(SM.getSpellingLoc(getStart(Body)))) |
| return; |
| |
| propagateCounts(getRegionCounter(Body), Body); |
| } |
| |
| void VisitReturnStmt(const ReturnStmt *S) { |
| extendRegion(S); |
| if (S->getRetValue()) |
| Visit(S->getRetValue()); |
| terminateRegion(S); |
| } |
| |
| void VisitCXXThrowExpr(const CXXThrowExpr *E) { |
| extendRegion(E); |
| if (E->getSubExpr()) |
| Visit(E->getSubExpr()); |
| terminateRegion(E); |
| } |
| |
| void VisitGotoStmt(const GotoStmt *S) { terminateRegion(S); } |
| |
| void VisitLabelStmt(const LabelStmt *S) { |
| SourceLocation Start = getStart(S); |
| // We can't extendRegion here or we risk overlapping with our new region. |
| handleFileExit(Start); |
| pushRegion(getRegionCounter(S), Start); |
| Visit(S->getSubStmt()); |
| } |
| |
| void VisitBreakStmt(const BreakStmt *S) { |
| assert(!BreakContinueStack.empty() && "break not in a loop or switch!"); |
| BreakContinueStack.back().BreakCount = addCounters( |
| BreakContinueStack.back().BreakCount, getRegion().getCounter()); |
| terminateRegion(S); |
| } |
| |
| void VisitContinueStmt(const ContinueStmt *S) { |
| assert(!BreakContinueStack.empty() && "continue stmt not in a loop!"); |
| BreakContinueStack.back().ContinueCount = addCounters( |
| BreakContinueStack.back().ContinueCount, getRegion().getCounter()); |
| terminateRegion(S); |
| } |
| |
| void VisitWhileStmt(const WhileStmt *S) { |
| extendRegion(S); |
| |
| Counter ParentCount = getRegion().getCounter(); |
| Counter BodyCount = getRegionCounter(S); |
| |
| // Handle the body first so that we can get the backedge count. |
| BreakContinueStack.push_back(BreakContinue()); |
| extendRegion(S->getBody()); |
| Counter BackedgeCount = propagateCounts(BodyCount, S->getBody()); |
| BreakContinue BC = BreakContinueStack.pop_back_val(); |
| |
| // Go back to handle the condition. |
| Counter CondCount = |
| addCounters(ParentCount, BackedgeCount, BC.ContinueCount); |
| propagateCounts(CondCount, S->getCond()); |
| adjustForOutOfOrderTraversal(getEnd(S)); |
| |
| Counter OutCount = |
| addCounters(BC.BreakCount, subtractCounters(CondCount, BodyCount)); |
| if (OutCount != ParentCount) |
| pushRegion(OutCount); |
| } |
| |
| void VisitDoStmt(const DoStmt *S) { |
| extendRegion(S); |
| |
| Counter ParentCount = getRegion().getCounter(); |
| Counter BodyCount = getRegionCounter(S); |
| |
| BreakContinueStack.push_back(BreakContinue()); |
| extendRegion(S->getBody()); |
| Counter BackedgeCount = |
| propagateCounts(addCounters(ParentCount, BodyCount), S->getBody()); |
| BreakContinue BC = BreakContinueStack.pop_back_val(); |
| |
| Counter CondCount = addCounters(BackedgeCount, BC.ContinueCount); |
| propagateCounts(CondCount, S->getCond()); |
| |
| Counter OutCount = |
| addCounters(BC.BreakCount, subtractCounters(CondCount, BodyCount)); |
| if (OutCount != ParentCount) |
| pushRegion(OutCount); |
| } |
| |
| void VisitForStmt(const ForStmt *S) { |
| extendRegion(S); |
| if (S->getInit()) |
| Visit(S->getInit()); |
| |
| Counter ParentCount = getRegion().getCounter(); |
| Counter BodyCount = getRegionCounter(S); |
| |
| // Handle the body first so that we can get the backedge count. |
| BreakContinueStack.push_back(BreakContinue()); |
| extendRegion(S->getBody()); |
| Counter BackedgeCount = propagateCounts(BodyCount, S->getBody()); |
| BreakContinue BC = BreakContinueStack.pop_back_val(); |
| |
| // The increment is essentially part of the body but it needs to include |
| // the count for all the continue statements. |
| if (const Stmt *Inc = S->getInc()) |
| propagateCounts(addCounters(BackedgeCount, BC.ContinueCount), Inc); |
| |
| // Go back to handle the condition. |
| Counter CondCount = |
| addCounters(ParentCount, BackedgeCount, BC.ContinueCount); |
| if (const Expr *Cond = S->getCond()) { |
| propagateCounts(CondCount, Cond); |
| adjustForOutOfOrderTraversal(getEnd(S)); |
| } |
| |
| Counter OutCount = |
| addCounters(BC.BreakCount, subtractCounters(CondCount, BodyCount)); |
| if (OutCount != ParentCount) |
| pushRegion(OutCount); |
| } |
| |
| void VisitCXXForRangeStmt(const CXXForRangeStmt *S) { |
| extendRegion(S); |
| Visit(S->getLoopVarStmt()); |
| Visit(S->getRangeStmt()); |
| |
| Counter ParentCount = getRegion().getCounter(); |
| Counter BodyCount = getRegionCounter(S); |
| |
| BreakContinueStack.push_back(BreakContinue()); |
| extendRegion(S->getBody()); |
| Counter BackedgeCount = propagateCounts(BodyCount, S->getBody()); |
| BreakContinue BC = BreakContinueStack.pop_back_val(); |
| |
| Counter LoopCount = |
| addCounters(ParentCount, BackedgeCount, BC.ContinueCount); |
| Counter OutCount = |
| addCounters(BC.BreakCount, subtractCounters(LoopCount, BodyCount)); |
| if (OutCount != ParentCount) |
| pushRegion(OutCount); |
| } |
| |
| void VisitObjCForCollectionStmt(const ObjCForCollectionStmt *S) { |
| extendRegion(S); |
| Visit(S->getElement()); |
| |
| Counter ParentCount = getRegion().getCounter(); |
| Counter BodyCount = getRegionCounter(S); |
| |
| BreakContinueStack.push_back(BreakContinue()); |
| extendRegion(S->getBody()); |
| Counter BackedgeCount = propagateCounts(BodyCount, S->getBody()); |
| BreakContinue BC = BreakContinueStack.pop_back_val(); |
| |
| Counter LoopCount = |
| addCounters(ParentCount, BackedgeCount, BC.ContinueCount); |
| Counter OutCount = |
| addCounters(BC.BreakCount, subtractCounters(LoopCount, BodyCount)); |
| if (OutCount != ParentCount) |
| pushRegion(OutCount); |
| } |
| |
| void VisitSwitchStmt(const SwitchStmt *S) { |
| extendRegion(S); |
| if (S->getInit()) |
| Visit(S->getInit()); |
| Visit(S->getCond()); |
| |
| BreakContinueStack.push_back(BreakContinue()); |
| |
| const Stmt *Body = S->getBody(); |
| extendRegion(Body); |
| if (const auto *CS = dyn_cast<CompoundStmt>(Body)) { |
| if (!CS->body_empty()) { |
| // The body of the switch needs a zero region so that fallthrough counts |
| // behave correctly, but it would be misleading to include the braces of |
| // the compound statement in the zeroed area, so we need to handle this |
| // specially. |
| size_t Index = |
| pushRegion(Counter::getZero(), getStart(CS->body_front()), |
| getEnd(CS->body_back())); |
| for (const auto *Child : CS->children()) |
| Visit(Child); |
| popRegions(Index); |
| } |
| } else |
| propagateCounts(Counter::getZero(), Body); |
| BreakContinue BC = BreakContinueStack.pop_back_val(); |
| |
| if (!BreakContinueStack.empty()) |
| BreakContinueStack.back().ContinueCount = addCounters( |
| BreakContinueStack.back().ContinueCount, BC.ContinueCount); |
| |
| Counter ExitCount = getRegionCounter(S); |
| SourceLocation ExitLoc = getEnd(S); |
| pushRegion(ExitCount); |
| |
| // Ensure that handleFileExit recognizes when the end location is located |
| // in a different file. |
| MostRecentLocation = getStart(S); |
| handleFileExit(ExitLoc); |
| } |
| |
| void VisitSwitchCase(const SwitchCase *S) { |
| extendRegion(S); |
| |
| SourceMappingRegion &Parent = getRegion(); |
| |
| Counter Count = addCounters(Parent.getCounter(), getRegionCounter(S)); |
| // Reuse the existing region if it starts at our label. This is typical of |
| // the first case in a switch. |
| if (Parent.hasStartLoc() && Parent.getStartLoc() == getStart(S)) |
| Parent.setCounter(Count); |
| else |
| pushRegion(Count, getStart(S)); |
| |
| if (const auto *CS = dyn_cast<CaseStmt>(S)) { |
| Visit(CS->getLHS()); |
| if (const Expr *RHS = CS->getRHS()) |
| Visit(RHS); |
| } |
| Visit(S->getSubStmt()); |
| } |
| |
| void VisitIfStmt(const IfStmt *S) { |
| extendRegion(S); |
| if (S->getInit()) |
| Visit(S->getInit()); |
| |
| // Extend into the condition before we propagate through it below - this is |
| // needed to handle macros that generate the "if" but not the condition. |
| extendRegion(S->getCond()); |
| |
| Counter ParentCount = getRegion().getCounter(); |
| Counter ThenCount = getRegionCounter(S); |
| |
| // Emitting a counter for the condition makes it easier to interpret the |
| // counter for the body when looking at the coverage. |
| propagateCounts(ParentCount, S->getCond()); |
| |
| extendRegion(S->getThen()); |
| Counter OutCount = propagateCounts(ThenCount, S->getThen()); |
| |
| Counter ElseCount = subtractCounters(ParentCount, ThenCount); |
| if (const Stmt *Else = S->getElse()) { |
| extendRegion(S->getElse()); |
| OutCount = addCounters(OutCount, propagateCounts(ElseCount, Else)); |
| } else |
| OutCount = addCounters(OutCount, ElseCount); |
| |
| if (OutCount != ParentCount) |
| pushRegion(OutCount); |
| } |
| |
| void VisitCXXTryStmt(const CXXTryStmt *S) { |
| extendRegion(S); |
| // Handle macros that generate the "try" but not the rest. |
| extendRegion(S->getTryBlock()); |
| |
| Counter ParentCount = getRegion().getCounter(); |
| propagateCounts(ParentCount, S->getTryBlock()); |
| |
| for (unsigned I = 0, E = S->getNumHandlers(); I < E; ++I) |
| Visit(S->getHandler(I)); |
| |
| Counter ExitCount = getRegionCounter(S); |
| pushRegion(ExitCount); |
| } |
| |
| void VisitCXXCatchStmt(const CXXCatchStmt *S) { |
| propagateCounts(getRegionCounter(S), S->getHandlerBlock()); |
| } |
| |
| void VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { |
| extendRegion(E); |
| |
| Counter ParentCount = getRegion().getCounter(); |
| Counter TrueCount = getRegionCounter(E); |
| |
| Visit(E->getCond()); |
| |
| if (!isa<BinaryConditionalOperator>(E)) { |
| extendRegion(E->getTrueExpr()); |
| propagateCounts(TrueCount, E->getTrueExpr()); |
| } |
| extendRegion(E->getFalseExpr()); |
| propagateCounts(subtractCounters(ParentCount, TrueCount), |
| E->getFalseExpr()); |
| } |
| |
| void VisitBinLAnd(const BinaryOperator *E) { |
| extendRegion(E); |
| Visit(E->getLHS()); |
| |
| extendRegion(E->getRHS()); |
| propagateCounts(getRegionCounter(E), E->getRHS()); |
| } |
| |
| void VisitBinLOr(const BinaryOperator *E) { |
| extendRegion(E); |
| Visit(E->getLHS()); |
| |
| extendRegion(E->getRHS()); |
| propagateCounts(getRegionCounter(E), E->getRHS()); |
| } |
| |
| void VisitLambdaExpr(const LambdaExpr *LE) { |
| // Lambdas are treated as their own functions for now, so we shouldn't |
| // propagate counts into them. |
| } |
| }; |
| |
| bool isMachO(const CodeGenModule &CGM) { |
| return CGM.getTarget().getTriple().isOSBinFormatMachO(); |
| } |
| |
| StringRef getCoverageSection(const CodeGenModule &CGM) { |
| return llvm::getInstrProfCoverageSectionName(isMachO(CGM)); |
| } |
| |
| std::string normalizeFilename(StringRef Filename) { |
| llvm::SmallString<256> Path(Filename); |
| llvm::sys::fs::make_absolute(Path); |
| llvm::sys::path::remove_dots(Path, /*remove_dot_dots=*/true); |
| return Path.str().str(); |
| } |
| |
| } // end anonymous namespace |
| |
| static void dump(llvm::raw_ostream &OS, StringRef FunctionName, |
| ArrayRef<CounterExpression> Expressions, |
| ArrayRef<CounterMappingRegion> Regions) { |
| OS << FunctionName << ":\n"; |
| CounterMappingContext Ctx(Expressions); |
| for (const auto &R : Regions) { |
| OS.indent(2); |
| switch (R.Kind) { |
| case CounterMappingRegion::CodeRegion: |
| break; |
| case CounterMappingRegion::ExpansionRegion: |
| OS << "Expansion,"; |
| break; |
| case CounterMappingRegion::SkippedRegion: |
| OS << "Skipped,"; |
| break; |
| } |
| |
| OS << "File " << R.FileID << ", " << R.LineStart << ":" << R.ColumnStart |
| << " -> " << R.LineEnd << ":" << R.ColumnEnd << " = "; |
| Ctx.dump(R.Count, OS); |
| if (R.Kind == CounterMappingRegion::ExpansionRegion) |
| OS << " (Expanded file = " << R.ExpandedFileID << ")"; |
| OS << "\n"; |
| } |
| } |
| |
| void CoverageMappingModuleGen::addFunctionMappingRecord( |
| llvm::GlobalVariable *NamePtr, StringRef NameValue, uint64_t FuncHash, |
| const std::string &CoverageMapping, bool IsUsed) { |
| llvm::LLVMContext &Ctx = CGM.getLLVMContext(); |
| if (!FunctionRecordTy) { |
| #define COVMAP_FUNC_RECORD(Type, LLVMType, Name, Init) LLVMType, |
| llvm::Type *FunctionRecordTypes[] = { |
| #include "llvm/ProfileData/InstrProfData.inc" |
| }; |
| FunctionRecordTy = |
| llvm::StructType::get(Ctx, makeArrayRef(FunctionRecordTypes), |
| /*isPacked=*/true); |
| } |
| |
| #define COVMAP_FUNC_RECORD(Type, LLVMType, Name, Init) Init, |
| llvm::Constant *FunctionRecordVals[] = { |
| #include "llvm/ProfileData/InstrProfData.inc" |
| }; |
| FunctionRecords.push_back(llvm::ConstantStruct::get( |
| FunctionRecordTy, makeArrayRef(FunctionRecordVals))); |
| if (!IsUsed) |
| FunctionNames.push_back( |
| llvm::ConstantExpr::getBitCast(NamePtr, llvm::Type::getInt8PtrTy(Ctx))); |
| CoverageMappings.push_back(CoverageMapping); |
| |
| if (CGM.getCodeGenOpts().DumpCoverageMapping) { |
| // Dump the coverage mapping data for this function by decoding the |
| // encoded data. This allows us to dump the mapping regions which were |
| // also processed by the CoverageMappingWriter which performs |
| // additional minimization operations such as reducing the number of |
| // expressions. |
| std::vector<StringRef> Filenames; |
| std::vector<CounterExpression> Expressions; |
| std::vector<CounterMappingRegion> Regions; |
| llvm::SmallVector<std::string, 16> FilenameStrs; |
| llvm::SmallVector<StringRef, 16> FilenameRefs; |
| FilenameStrs.resize(FileEntries.size()); |
| FilenameRefs.resize(FileEntries.size()); |
| for (const auto &Entry : FileEntries) { |
| auto I = Entry.second; |
| FilenameStrs[I] = normalizeFilename(Entry.first->getName()); |
| FilenameRefs[I] = FilenameStrs[I]; |
| } |
| RawCoverageMappingReader Reader(CoverageMapping, FilenameRefs, Filenames, |
| Expressions, Regions); |
| if (Reader.read()) |
| return; |
| dump(llvm::outs(), NameValue, Expressions, Regions); |
| } |
| } |
| |
| void CoverageMappingModuleGen::emit() { |
| if (FunctionRecords.empty()) |
| return; |
| llvm::LLVMContext &Ctx = CGM.getLLVMContext(); |
| auto *Int32Ty = llvm::Type::getInt32Ty(Ctx); |
| |
| // Create the filenames and merge them with coverage mappings |
| llvm::SmallVector<std::string, 16> FilenameStrs; |
| llvm::SmallVector<StringRef, 16> FilenameRefs; |
| FilenameStrs.resize(FileEntries.size()); |
| FilenameRefs.resize(FileEntries.size()); |
| for (const auto &Entry : FileEntries) { |
| auto I = Entry.second; |
| FilenameStrs[I] = normalizeFilename(Entry.first->getName()); |
| FilenameRefs[I] = FilenameStrs[I]; |
| } |
| |
| std::string FilenamesAndCoverageMappings; |
| llvm::raw_string_ostream OS(FilenamesAndCoverageMappings); |
| CoverageFilenamesSectionWriter(FilenameRefs).write(OS); |
| std::string RawCoverageMappings = |
| llvm::join(CoverageMappings.begin(), CoverageMappings.end(), ""); |
| OS << RawCoverageMappings; |
| size_t CoverageMappingSize = RawCoverageMappings.size(); |
| size_t FilenamesSize = OS.str().size() - CoverageMappingSize; |
| // Append extra zeroes if necessary to ensure that the size of the filenames |
| // and coverage mappings is a multiple of 8. |
| if (size_t Rem = OS.str().size() % 8) { |
| CoverageMappingSize += 8 - Rem; |
| for (size_t I = 0, S = 8 - Rem; I < S; ++I) |
| OS << '\0'; |
| } |
| auto *FilenamesAndMappingsVal = |
| llvm::ConstantDataArray::getString(Ctx, OS.str(), false); |
| |
| // Create the deferred function records array |
| auto RecordsTy = |
| llvm::ArrayType::get(FunctionRecordTy, FunctionRecords.size()); |
| auto RecordsVal = llvm::ConstantArray::get(RecordsTy, FunctionRecords); |
| |
| llvm::Type *CovDataHeaderTypes[] = { |
| #define COVMAP_HEADER(Type, LLVMType, Name, Init) LLVMType, |
| #include "llvm/ProfileData/InstrProfData.inc" |
| }; |
| auto CovDataHeaderTy = |
| llvm::StructType::get(Ctx, makeArrayRef(CovDataHeaderTypes)); |
| llvm::Constant *CovDataHeaderVals[] = { |
| #define COVMAP_HEADER(Type, LLVMType, Name, Init) Init, |
| #include "llvm/ProfileData/InstrProfData.inc" |
| }; |
| auto CovDataHeaderVal = llvm::ConstantStruct::get( |
| CovDataHeaderTy, makeArrayRef(CovDataHeaderVals)); |
| |
| // Create the coverage data record |
| llvm::Type *CovDataTypes[] = {CovDataHeaderTy, RecordsTy, |
| FilenamesAndMappingsVal->getType()}; |
| auto CovDataTy = llvm::StructType::get(Ctx, makeArrayRef(CovDataTypes)); |
| llvm::Constant *TUDataVals[] = {CovDataHeaderVal, RecordsVal, |
| FilenamesAndMappingsVal}; |
| auto CovDataVal = |
| llvm::ConstantStruct::get(CovDataTy, makeArrayRef(TUDataVals)); |
| auto CovData = new llvm::GlobalVariable( |
| CGM.getModule(), CovDataTy, true, llvm::GlobalValue::InternalLinkage, |
| CovDataVal, llvm::getCoverageMappingVarName()); |
| |
| CovData->setSection(getCoverageSection(CGM)); |
| CovData->setAlignment(8); |
| |
| // Make sure the data doesn't get deleted. |
| CGM.addUsedGlobal(CovData); |
| // Create the deferred function records array |
| if (!FunctionNames.empty()) { |
| auto NamesArrTy = llvm::ArrayType::get(llvm::Type::getInt8PtrTy(Ctx), |
| FunctionNames.size()); |
| auto NamesArrVal = llvm::ConstantArray::get(NamesArrTy, FunctionNames); |
| // This variable will *NOT* be emitted to the object file. It is used |
| // to pass the list of names referenced to codegen. |
| new llvm::GlobalVariable(CGM.getModule(), NamesArrTy, true, |
| llvm::GlobalValue::InternalLinkage, NamesArrVal, |
| llvm::getCoverageUnusedNamesVarName()); |
| } |
| } |
| |
| unsigned CoverageMappingModuleGen::getFileID(const FileEntry *File) { |
| auto It = FileEntries.find(File); |
| if (It != FileEntries.end()) |
| return It->second; |
| unsigned FileID = FileEntries.size(); |
| FileEntries.insert(std::make_pair(File, FileID)); |
| return FileID; |
| } |
| |
| void CoverageMappingGen::emitCounterMapping(const Decl *D, |
| llvm::raw_ostream &OS) { |
| assert(CounterMap); |
| CounterCoverageMappingBuilder Walker(CVM, *CounterMap, SM, LangOpts); |
| Walker.VisitDecl(D); |
| Walker.write(OS); |
| } |
| |
| void CoverageMappingGen::emitEmptyMapping(const Decl *D, |
| llvm::raw_ostream &OS) { |
| EmptyCoverageMappingBuilder Walker(CVM, SM, LangOpts); |
| Walker.VisitDecl(D); |
| Walker.write(OS); |
| } |