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Diffstat (limited to 'clang/lib/CodeGen/CoverageMappingGen.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CoverageMappingGen.cpp | 1495 |
1 files changed, 1495 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CoverageMappingGen.cpp b/clang/lib/CodeGen/CoverageMappingGen.cpp new file mode 100644 index 000000000000..a6f6e38d5f14 --- /dev/null +++ b/clang/lib/CodeGen/CoverageMappingGen.cpp @@ -0,0 +1,1495 @@ +//===--- CoverageMappingGen.cpp - Coverage mapping generation ---*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// 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, SourceLocation) { + SkippedRanges.push_back(Range); +} + +namespace { + +/// A region of source code that can be mapped to a counter. +class SourceMappingRegion { + Counter Count; + + /// The region's starting location. + Optional<SourceLocation> LocStart; + + /// The region's ending location. + Optional<SourceLocation> LocEnd; + + /// Whether this region should be emitted after its parent is emitted. + bool DeferRegion; + + /// Whether this region is a gap region. The count from a gap region is set + /// as the line execution count if there are no other regions on the line. + bool GapRegion; + +public: + SourceMappingRegion(Counter Count, Optional<SourceLocation> LocStart, + Optional<SourceLocation> LocEnd, bool DeferRegion = false, + bool GapRegion = false) + : Count(Count), LocStart(LocStart), LocEnd(LocEnd), + DeferRegion(DeferRegion), GapRegion(GapRegion) {} + + 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 getBeginLoc() const { + assert(LocStart && "Region has no start location"); + return *LocStart; + } + + bool hasEndLoc() const { return LocEnd.hasValue(); } + + void setEndLoc(SourceLocation Loc) { + assert(Loc.isValid() && "Setting an invalid end location"); + LocEnd = Loc; + } + + SourceLocation getEndLoc() const { + assert(LocEnd && "Region has no end location"); + return *LocEnd; + } + + bool isDeferred() const { return DeferRegion; } + + void setDeferred(bool Deferred) { DeferRegion = Deferred; } + + bool isGap() const { return GapRegion; } + + void setGap(bool Gap) { GapRegion = Gap; } +}; + +/// Spelling locations for the start and end of a source region. +struct SpellingRegion { + /// The line where the region starts. + unsigned LineStart; + + /// The column where the region starts. + unsigned ColumnStart; + + /// The line where the region ends. + unsigned LineEnd; + + /// The column where the region ends. + unsigned ColumnEnd; + + SpellingRegion(SourceManager &SM, SourceLocation LocStart, + SourceLocation LocEnd) { + LineStart = SM.getSpellingLineNumber(LocStart); + ColumnStart = SM.getSpellingColumnNumber(LocStart); + LineEnd = SM.getSpellingLineNumber(LocEnd); + ColumnEnd = SM.getSpellingColumnNumber(LocEnd); + } + + SpellingRegion(SourceManager &SM, SourceMappingRegion &R) + : SpellingRegion(SM, R.getBeginLoc(), R.getEndLoc()) {} + + /// Check if the start and end locations appear in source order, i.e + /// top->bottom, left->right. + bool isInSourceOrder() const { + return (LineStart < LineEnd) || + (LineStart == LineEnd && ColumnStart <= ColumnEnd); + } +}; + +/// Provides the common functionality for the different +/// coverage mapping region builders. +class CoverageMappingBuilder { +public: + CoverageMappingModuleGen &CVM; + SourceManager &SM; + const LangOptions &LangOpts; + +private: + /// Map of clang's FileIDs to IDs used for coverage mapping. + llvm::SmallDenseMap<FileID, std::pair<unsigned, SourceLocation>, 8> + FileIDMapping; + +public: + /// The coverage mapping regions for this function + llvm::SmallVector<CounterMappingRegion, 32> MappingRegions; + /// The source mapping regions for this function. + std::vector<SourceMappingRegion> SourceRegions; + + /// 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) {} + + /// 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); + } + + /// 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)); + } + + /// 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)); + } + + /// Find out where the current file is included or macro is expanded. + SourceLocation getIncludeOrExpansionLoc(SourceLocation Loc) { + return Loc.isMacroID() ? SM.getImmediateExpansionRange(Loc).getBegin() + : SM.getIncludeLoc(SM.getFileID(Loc)); + } + + /// 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>"; + } + + /// 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; + } + + /// Get the start of \c S ignoring macro arguments and builtin macros. + SourceLocation getStart(const Stmt *S) { + SourceLocation Loc = S->getBeginLoc(); + while (SM.isMacroArgExpansion(Loc) || isInBuiltin(Loc)) + Loc = SM.getImmediateExpansionRange(Loc).getBegin(); + return Loc; + } + + /// Get the end of \c S ignoring macro arguments and builtin macros. + SourceLocation getEnd(const Stmt *S) { + SourceLocation Loc = S->getEndLoc(); + while (SM.isMacroArgExpansion(Loc) || isInBuiltin(Loc)) + Loc = SM.getImmediateExpansionRange(Loc).getBegin(); + return getPreciseTokenLocEnd(Loc); + } + + /// 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.getBeginLoc(); + 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)); + } + llvm::stable_sort(FileLocs, 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)); + } + } + + /// 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; + } + + /// 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; + SpellingRegion SR{SM, LocStart, LocEnd}; + auto Region = CounterMappingRegion::makeSkipped( + *CovFileID, SR.LineStart, SR.ColumnStart, SR.LineEnd, SR.ColumnEnd); + // Make sure that we only collect the regions that are inside + // the source code of this function. + if (Region.LineStart >= FileLineRanges[*CovFileID].first && + Region.LineEnd <= FileLineRanges[*CovFileID].second) + MappingRegions.push_back(Region); + } + } + + /// 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.getBeginLoc(); + 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 spelling locations for the mapping region. + SpellingRegion SR{SM, LocStart, LocEnd}; + assert(SR.isInSourceOrder() && "region start and end out of order"); + + if (Region.isGap()) { + MappingRegions.push_back(CounterMappingRegion::makeGapRegion( + Region.getCounter(), *CovFileID, SR.LineStart, SR.ColumnStart, + SR.LineEnd, SR.ColumnEnd)); + } else { + MappingRegions.push_back(CounterMappingRegion::makeRegion( + Region.getCounter(), *CovFileID, SR.LineStart, SR.ColumnStart, + SR.LineEnd, SR.ColumnEnd)); + } + } + } + + /// 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)); + + SpellingRegion SR{SM, ParentLoc, LocEnd}; + assert(SR.isInSourceOrder() && "region start and end out of order"); + MappingRegions.push_back(CounterMappingRegion::makeExpansion( + *ParentFileID, *ExpandedFileID, SR.LineStart, SR.ColumnStart, + SR.LineEnd, SR.ColumnEnd)); + } + return Filter; + } +}; + +/// 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); + } + + /// 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); + } +}; + +/// 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> { + /// The map of statements to count values. + llvm::DenseMap<const Stmt *, unsigned> &CounterMap; + + /// A stack of currently live regions. + std::vector<SourceMappingRegion> RegionStack; + + /// The currently deferred region: its end location and count can be set once + /// its parent has been popped from the region stack. + Optional<SourceMappingRegion> DeferredRegion; + + CounterExpressionBuilder Builder; + + /// 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; + + /// Location of the last terminated region. + Optional<std::pair<SourceLocation, size_t>> LastTerminatedRegion; + + /// Return a counter for the subtraction of \c RHS from \c LHS + Counter subtractCounters(Counter LHS, Counter RHS) { + return Builder.subtract(LHS, RHS); + } + + /// 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); + } + + /// 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]); + } + + /// 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; + completeDeferred(Count, MostRecentLocation); + } + RegionStack.emplace_back(Count, StartLoc, EndLoc); + + return RegionStack.size() - 1; + } + + /// Complete any pending deferred region by setting its end location and + /// count, and then pushing it onto the region stack. + size_t completeDeferred(Counter Count, SourceLocation DeferredEndLoc) { + size_t Index = RegionStack.size(); + if (!DeferredRegion) + return Index; + + // Consume the pending region. + SourceMappingRegion DR = DeferredRegion.getValue(); + DeferredRegion = None; + + // If the region ends in an expansion, find the expansion site. + FileID StartFile = SM.getFileID(DR.getBeginLoc()); + if (SM.getFileID(DeferredEndLoc) != StartFile) { + if (isNestedIn(DeferredEndLoc, StartFile)) { + do { + DeferredEndLoc = getIncludeOrExpansionLoc(DeferredEndLoc); + } while (StartFile != SM.getFileID(DeferredEndLoc)); + } else { + return Index; + } + } + + // The parent of this deferred region ends where the containing decl ends, + // so the region isn't useful. + if (DR.getBeginLoc() == DeferredEndLoc) + return Index; + + // If we're visiting statements in non-source order (e.g switch cases or + // a loop condition) we can't construct a sensible deferred region. + if (!SpellingRegion(SM, DR.getBeginLoc(), DeferredEndLoc).isInSourceOrder()) + return Index; + + DR.setGap(true); + DR.setCounter(Count); + DR.setEndLoc(DeferredEndLoc); + handleFileExit(DeferredEndLoc); + RegionStack.push_back(DR); + return Index; + } + + /// Complete a deferred region created after a terminated region at the + /// top-level. + void completeTopLevelDeferredRegion(Counter Count, + SourceLocation DeferredEndLoc) { + if (DeferredRegion || !LastTerminatedRegion) + return; + + if (LastTerminatedRegion->second != RegionStack.size()) + return; + + SourceLocation Start = LastTerminatedRegion->first; + if (SM.getFileID(Start) != SM.getMainFileID()) + return; + + SourceMappingRegion DR = RegionStack.back(); + DR.setStartLoc(Start); + DR.setDeferred(false); + DeferredRegion = DR; + completeDeferred(Count, DeferredEndLoc); + } + + size_t locationDepth(SourceLocation Loc) { + size_t Depth = 0; + while (Loc.isValid()) { + Loc = getIncludeOrExpansionLoc(Loc); + Depth++; + } + return Depth; + } + + /// 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"); + bool ParentOfDeferredRegion = false; + while (RegionStack.size() > ParentIndex) { + SourceMappingRegion &Region = RegionStack.back(); + if (Region.hasStartLoc()) { + SourceLocation StartLoc = Region.getBeginLoc(); + SourceLocation EndLoc = Region.hasEndLoc() + ? Region.getEndLoc() + : RegionStack[ParentIndex].getEndLoc(); + size_t StartDepth = locationDepth(StartLoc); + size_t EndDepth = locationDepth(EndLoc); + while (!SM.isWrittenInSameFile(StartLoc, EndLoc)) { + bool UnnestStart = StartDepth >= EndDepth; + bool UnnestEnd = EndDepth >= StartDepth; + if (UnnestEnd) { + // 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"); + EndDepth--; + } + if (UnnestStart) { + // The region begins in a nested file or macro expansion. Create a + // separate region for each expansion. + SourceLocation NestedLoc = getEndOfFileOrMacro(StartLoc); + assert(SM.isWrittenInSameFile(StartLoc, NestedLoc)); + + if (!isRegionAlreadyAdded(StartLoc, NestedLoc)) + SourceRegions.emplace_back(Region.getCounter(), StartLoc, NestedLoc); + + StartLoc = getIncludeOrExpansionLoc(StartLoc); + if (StartLoc.isInvalid()) + llvm::report_fatal_error("File exit not handled before popRegions"); + StartDepth--; + } + } + Region.setStartLoc(StartLoc); + 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.getBeginLoc(), EndLoc)); + assert(SpellingRegion(SM, Region).isInSourceOrder()); + SourceRegions.push_back(Region); + + if (ParentOfDeferredRegion) { + ParentOfDeferredRegion = false; + + // If there's an existing deferred region, keep the old one, because + // it means there are two consecutive returns (or a similar pattern). + if (!DeferredRegion.hasValue() && + // File IDs aren't gathered within macro expansions, so it isn't + // useful to try and create a deferred region inside of one. + !EndLoc.isMacroID()) + DeferredRegion = + SourceMappingRegion(Counter::getZero(), EndLoc, None); + } + } else if (Region.isDeferred()) { + assert(!ParentOfDeferredRegion && "Consecutive deferred regions"); + ParentOfDeferredRegion = true; + } + RegionStack.pop_back(); + + // If the zero region pushed after the last terminated region no longer + // exists, clear its cached information. + if (LastTerminatedRegion && + RegionStack.size() < LastTerminatedRegion->second) + LastTerminatedRegion = None; + } + assert(!ParentOfDeferredRegion && "Deferred region with no parent"); + } + + /// Return the currently active region. + SourceMappingRegion &getRegion() { + assert(!RegionStack.empty() && "statement has no region"); + return RegionStack.back(); + } + + /// Propagate counts through the children of \p S if \p VisitChildren is true. + /// Otherwise, only emit a count for \p S itself. + Counter propagateCounts(Counter TopCount, const Stmt *S, + bool VisitChildren = true) { + SourceLocation StartLoc = getStart(S); + SourceLocation EndLoc = getEnd(S); + size_t Index = pushRegion(TopCount, StartLoc, EndLoc); + if (VisitChildren) + 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(StartLoc, S->getBeginLoc())) + MostRecentLocation = EndLoc; + + return ExitCount; + } + + /// 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.getBeginLoc() == StartLoc && + Region.getEndLoc() == EndLoc; + }); + } + + /// 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); + } + + /// 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.getBeginLoc(); + 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)); + assert(SpellingRegion(SM, SourceRegions.back()).isInSourceOrder()); + } + Loc = getIncludeOrExpansionLoc(Loc); + } + } + + MostRecentLocation = NewLoc; + } + + /// 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); + + completeDeferred(Region.getCounter(), StartLoc); + } + + /// Mark \c S as a terminator, starting a zero region. + void terminateRegion(const Stmt *S) { + extendRegion(S); + SourceMappingRegion &Region = getRegion(); + SourceLocation EndLoc = getEnd(S); + if (!Region.hasEndLoc()) + Region.setEndLoc(EndLoc); + pushRegion(Counter::getZero()); + auto &ZeroRegion = getRegion(); + ZeroRegion.setDeferred(true); + LastTerminatedRegion = {EndLoc, RegionStack.size()}; + } + + /// Find a valid gap range between \p AfterLoc and \p BeforeLoc. + Optional<SourceRange> findGapAreaBetween(SourceLocation AfterLoc, + SourceLocation BeforeLoc) { + // If the start and end locations of the gap are both within the same macro + // file, the range may not be in source order. + if (AfterLoc.isMacroID() || BeforeLoc.isMacroID()) + return None; + if (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc)) + return None; + return {{AfterLoc, BeforeLoc}}; + } + + /// Find the source range after \p AfterStmt and before \p BeforeStmt. + Optional<SourceRange> findGapAreaBetween(const Stmt *AfterStmt, + const Stmt *BeforeStmt) { + return findGapAreaBetween(getPreciseTokenLocEnd(getEnd(AfterStmt)), + getStart(BeforeStmt)); + } + + /// Emit a gap region between \p StartLoc and \p EndLoc with the given count. + void fillGapAreaWithCount(SourceLocation StartLoc, SourceLocation EndLoc, + Counter Count) { + if (StartLoc == EndLoc) + return; + assert(SpellingRegion(SM, StartLoc, EndLoc).isInSourceOrder()); + handleFileExit(StartLoc); + size_t Index = pushRegion(Count, StartLoc, EndLoc); + getRegion().setGap(true); + handleFileExit(EndLoc); + popRegions(Index); + } + + /// 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), + DeferredRegion(None) {} + + /// Write the mapping data to the output stream + void write(llvm::raw_ostream &OS) { + llvm::SmallVector<unsigned, 8> VirtualFileMapping; + gatherFileIDs(VirtualFileMapping); + SourceRegionFilter Filter = emitExpansionRegions(); + assert(!DeferredRegion && "Deferred region never completed"); + emitSourceRegions(Filter); + gatherSkippedRegions(); + + if (MappingRegions.empty()) + return; + + CoverageMappingWriter Writer(VirtualFileMapping, Builder.getExpressions(), + MappingRegions); + Writer.write(OS); + } + + void VisitStmt(const Stmt *S) { + if (S->getBeginLoc().isValid()) + extendRegion(S); + for (const Stmt *Child : S->children()) + if (Child) + this->Visit(Child); + handleFileExit(getEnd(S)); + } + + void VisitDecl(const Decl *D) { + assert(!DeferredRegion && "Deferred region never completed"); + + Stmt *Body = D->getBody(); + + // Do not propagate region counts into system headers. + if (Body && SM.isInSystemHeader(SM.getSpellingLoc(getStart(Body)))) + return; + + // Do not visit the artificial children nodes of defaulted methods. The + // lexer may not be able to report back precise token end locations for + // these children nodes (llvm.org/PR39822), and moreover users will not be + // able to see coverage for them. + bool Defaulted = false; + if (auto *Method = dyn_cast<CXXMethodDecl>(D)) + Defaulted = Method->isDefaulted(); + + propagateCounts(getRegionCounter(Body), Body, + /*VisitChildren=*/!Defaulted); + assert(RegionStack.empty() && "Regions entered but never exited"); + + // Discard the last uncompleted deferred region in a decl, if one exists. + // This prevents lines at the end of a function containing only whitespace + // or closing braces from being marked as uncovered. + DeferredRegion = None; + } + + 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) { + Counter LabelCount = getRegionCounter(S); + SourceLocation Start = getStart(S); + completeTopLevelDeferredRegion(LabelCount, Start); + completeDeferred(LabelCount, Start); + // We can't extendRegion here or we risk overlapping with our new region. + handleFileExit(Start); + pushRegion(LabelCount, 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()); + // FIXME: a break in a switch should terminate regions for all preceding + // case statements, not just the most recent one. + 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 VisitCallExpr(const CallExpr *E) { + VisitStmt(E); + + // Terminate the region when we hit a noreturn function. + // (This is helpful dealing with switch statements.) + QualType CalleeType = E->getCallee()->getType(); + if (getFunctionExtInfo(*CalleeType).getNoReturn()) + terminateRegion(E); + } + + 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)); + + // The body count applies to the area immediately after the increment. + auto Gap = findGapAreaBetween(S->getCond(), S->getBody()); + if (Gap) + fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(), BodyCount); + + 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); + + // The loop increment may contain a break or continue. + if (S->getInc()) + BreakContinueStack.emplace_back(); + + // Handle the body first so that we can get the backedge count. + BreakContinueStack.emplace_back(); + extendRegion(S->getBody()); + Counter BackedgeCount = propagateCounts(BodyCount, S->getBody()); + BreakContinue BodyBC = BreakContinueStack.pop_back_val(); + + // The increment is essentially part of the body but it needs to include + // the count for all the continue statements. + BreakContinue IncrementBC; + if (const Stmt *Inc = S->getInc()) { + propagateCounts(addCounters(BackedgeCount, BodyBC.ContinueCount), Inc); + IncrementBC = BreakContinueStack.pop_back_val(); + } + + // Go back to handle the condition. + Counter CondCount = addCounters( + addCounters(ParentCount, BackedgeCount, BodyBC.ContinueCount), + IncrementBC.ContinueCount); + if (const Expr *Cond = S->getCond()) { + propagateCounts(CondCount, Cond); + adjustForOutOfOrderTraversal(getEnd(S)); + } + + // The body count applies to the area immediately after the increment. + auto Gap = findGapAreaBetween(getPreciseTokenLocEnd(S->getRParenLoc()), + getStart(S->getBody())); + if (Gap) + fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(), BodyCount); + + Counter OutCount = addCounters(BodyBC.BreakCount, IncrementBC.BreakCount, + subtractCounters(CondCount, BodyCount)); + if (OutCount != ParentCount) + pushRegion(OutCount); + } + + void VisitCXXForRangeStmt(const CXXForRangeStmt *S) { + extendRegion(S); + if (S->getInit()) + Visit(S->getInit()); + 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(); + + // The body count applies to the area immediately after the range. + auto Gap = findGapAreaBetween(getPreciseTokenLocEnd(S->getRParenLoc()), + getStart(S->getBody())); + if (Gap) + fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(), BodyCount); + + 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(); + + // The body count applies to the area immediately after the collection. + auto Gap = findGapAreaBetween(getPreciseTokenLocEnd(S->getRParenLoc()), + getStart(S->getBody())); + if (Gap) + fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(), BodyCount); + + 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()) { + // Make a region for the body of the switch. If the body starts with + // a case, that case will reuse this region; otherwise, this covers + // the unreachable code at the beginning of the switch body. + size_t Index = + pushRegion(Counter::getZero(), getStart(CS->body_front())); + for (const auto *Child : CS->children()) + Visit(Child); + + // Set the end for the body of the switch, if it isn't already set. + for (size_t i = RegionStack.size(); i != Index; --i) { + if (!RegionStack[i - 1].hasEndLoc()) + RegionStack[i - 1].setEndLoc(getEnd(CS->body_back())); + } + + 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.getBeginLoc() == 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()); + + // The 'then' count applies to the area immediately after the condition. + auto Gap = findGapAreaBetween(S->getCond(), S->getThen()); + if (Gap) + fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(), ThenCount); + + extendRegion(S->getThen()); + Counter OutCount = propagateCounts(ThenCount, S->getThen()); + + Counter ElseCount = subtractCounters(ParentCount, ThenCount); + if (const Stmt *Else = S->getElse()) { + // The 'else' count applies to the area immediately after the 'then'. + Gap = findGapAreaBetween(S->getThen(), Else); + if (Gap) + fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(), ElseCount); + extendRegion(Else); + 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)) { + // The 'then' count applies to the area immediately after the condition. + auto Gap = + findGapAreaBetween(E->getQuestionLoc(), getStart(E->getTrueExpr())); + if (Gap) + fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(), TrueCount); + + extendRegion(E->getTrueExpr()); + propagateCounts(TrueCount, E->getTrueExpr()); + } + + extendRegion(E->getFalseExpr()); + propagateCounts(subtractCounters(ParentCount, TrueCount), + E->getFalseExpr()); + } + + void VisitBinLAnd(const BinaryOperator *E) { + extendRegion(E->getLHS()); + propagateCounts(getRegion().getCounter(), E->getLHS()); + handleFileExit(getEnd(E->getLHS())); + + extendRegion(E->getRHS()); + propagateCounts(getRegionCounter(E), E->getRHS()); + } + + void VisitBinLOr(const BinaryOperator *E) { + extendRegion(E->getLHS()); + propagateCounts(getRegion().getCounter(), E->getLHS()); + handleFileExit(getEnd(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. + } +}; + +std::string getCoverageSection(const CodeGenModule &CGM) { + return llvm::getInstrProfSectionName( + llvm::IPSK_covmap, + CGM.getContext().getTargetInfo().getTriple().getObjectFormat()); +} + +} // 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; + case CounterMappingRegion::GapRegion: + OS << "Gap,"; + 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"; + } +} + +CoverageMappingModuleGen::CoverageMappingModuleGen( + CodeGenModule &CGM, CoverageSourceInfo &SourceInfo) + : CGM(CGM), SourceInfo(SourceInfo), FunctionRecordTy(nullptr) { + // Honor -fdebug-compilation-dir in paths in coverage data. Otherwise, use the + // regular working directory when normalizing paths. + if (!CGM.getCodeGenOpts().DebugCompilationDir.empty()) + CWD = CGM.getCodeGenOpts().DebugCompilationDir; + else + llvm::sys::fs::current_path(CWD); +} + +std::string CoverageMappingModuleGen::normalizeFilename(StringRef Filename) { + llvm::SmallString<256> Path(Filename); + llvm::sys::fs::make_absolute(CWD, Path); + llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true); + return Path.str().str(); +} + +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); + + // Stream the content of CoverageMappings to OS while keeping + // memory consumption under control. + size_t CoverageMappingSize = 0; + for (auto &S : CoverageMappings) { + CoverageMappingSize += S.size(); + OS << S; + S.clear(); + S.shrink_to_fit(); + } + CoverageMappings.clear(); + CoverageMappings.shrink_to_fit(); + + 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; + OS.write_zeros(8 - Rem); + } + 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(llvm::Align(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); +} |