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CoverageMappingGen.cpp
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//===--- 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/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringExtras.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"
// This selects the coverage mapping format defined when `InstrProfData.inc`
// is textually included.
#define COVMAP_V3
static llvm::cl::opt<bool> EmptyLineCommentCoverage(
"emptyline-comment-coverage",
llvm::cl::desc("Emit emptylines and comment lines as skipped regions (only "
"disable it on test)"),
llvm::cl::init(true), llvm::cl::Hidden);
using namespace clang;
using namespace CodeGen;
using namespace llvm::coverage;
CoverageSourceInfo *
CoverageMappingModuleGen::setUpCoverageCallbacks(Preprocessor &PP) {
CoverageSourceInfo *CoverageInfo =
new CoverageSourceInfo(PP.getSourceManager());
PP.addPPCallbacks(std::unique_ptr<PPCallbacks>(CoverageInfo));
if (EmptyLineCommentCoverage) {
PP.addCommentHandler(CoverageInfo);
PP.setEmptylineHandler(CoverageInfo);
PP.setPreprocessToken(true);
PP.setTokenWatcher([CoverageInfo](clang::Token Tok) {
// Update previous token location.
CoverageInfo->PrevTokLoc = Tok.getLocation();
if (Tok.getKind() != clang::tok::eod)
CoverageInfo->updateNextTokLoc(Tok.getLocation());
});
}
return CoverageInfo;
}
void CoverageSourceInfo::AddSkippedRange(SourceRange Range) {
if (EmptyLineCommentCoverage && !SkippedRanges.empty() &&
PrevTokLoc == SkippedRanges.back().PrevTokLoc &&
SourceMgr.isWrittenInSameFile(SkippedRanges.back().Range.getEnd(),
Range.getBegin()))
SkippedRanges.back().Range.setEnd(Range.getEnd());
else
SkippedRanges.push_back({Range, PrevTokLoc});
}
void CoverageSourceInfo::SourceRangeSkipped(SourceRange Range, SourceLocation) {
AddSkippedRange(Range);
}
void CoverageSourceInfo::HandleEmptyline(SourceRange Range) {
AddSkippedRange(Range);
}
bool CoverageSourceInfo::HandleComment(Preprocessor &PP, SourceRange Range) {
AddSkippedRange(Range);
return false;
}
void CoverageSourceInfo::updateNextTokLoc(SourceLocation Loc) {
if (!SkippedRanges.empty() && SkippedRanges.back().NextTokLoc.isInvalid())
SkippedRanges.back().NextTokLoc = Loc;
}
namespace {
/// A region of source code that can be mapped to a counter.
class SourceMappingRegion {
/// Primary Counter that is also used for Branch Regions for "True" branches.
Counter Count;
/// Secondary Counter used for Branch Regions for "False" branches.
Optional<Counter> FalseCount;
/// The region's starting location.
Optional<SourceLocation> LocStart;
/// The region's ending location.
Optional<SourceLocation> LocEnd;
/// 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 GapRegion = false)
: Count(Count), LocStart(LocStart), LocEnd(LocEnd), GapRegion(GapRegion) {
}
SourceMappingRegion(Counter Count, Optional<Counter> FalseCount,
Optional<SourceLocation> LocStart,
Optional<SourceLocation> LocEnd, bool GapRegion = false)
: Count(Count), FalseCount(FalseCount), LocStart(LocStart),
LocEnd(LocEnd), GapRegion(GapRegion) {}
const Counter &getCounter() const { return Count; }
const Counter &getFalseCounter() const {
assert(FalseCount && "Region has no alternate counter");
return *FalseCount;
}
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 isGap() const { return GapRegion; }
void setGap(bool Gap) { GapRegion = Gap; }
bool isBranch() const { return FalseCount.hasValue(); }
};
/// 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;
}
/// This shrinks the skipped range if it spans a line that contains a
/// non-comment token. If shrinking the skipped range would make it empty,
/// this returns None.
Optional<SpellingRegion> adjustSkippedRange(SourceManager &SM,
SourceLocation LocStart,
SourceLocation LocEnd,
SourceLocation PrevTokLoc,
SourceLocation NextTokLoc) {
SpellingRegion SR{SM, LocStart, LocEnd};
SR.ColumnStart = 1;
if (PrevTokLoc.isValid() && SM.isWrittenInSameFile(LocStart, PrevTokLoc) &&
SR.LineStart == SM.getSpellingLineNumber(PrevTokLoc))
SR.LineStart++;
if (NextTokLoc.isValid() && SM.isWrittenInSameFile(LocEnd, NextTokLoc) &&
SR.LineEnd == SM.getSpellingLineNumber(NextTokLoc)) {
SR.LineEnd--;
SR.ColumnEnd++;
}
if (SR.isInSourceOrder())
return SR;
return None;
}
/// Gather all the regions that were skipped by the preprocessor
/// using the constructs like #if or comments.
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 (auto &I : SkippedRanges) {
SourceRange Range = I.Range;
auto LocStart = Range.getBegin();
auto LocEnd = Range.getEnd();
assert(SM.isWrittenInSameFile(LocStart, LocEnd) &&
"region spans multiple files");
auto CovFileID = getCoverageFileID(LocStart);
if (!CovFileID)
continue;
Optional<SpellingRegion> SR =
adjustSkippedRange(SM, LocStart, LocEnd, I.PrevTokLoc, I.NextTokLoc);
if (!SR.hasValue())
continue;
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 if (Region.isBranch()) {
MappingRegions.push_back(CounterMappingRegion::makeBranchRegion(
Region.getCounter(), Region.getFalseCounter(), *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;
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;
/// Whether the visitor at a terminate statement.
bool HasTerminateStmt = false;
/// Gap region counter after terminate statement.
Counter GapRegionCounter;
/// 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,
Optional<Counter> FalseCount = None) {
if (StartLoc && !FalseCount.hasValue()) {
MostRecentLocation = *StartLoc;
}
RegionStack.emplace_back(Count, FalseCount, StartLoc, EndLoc);
return RegionStack.size() - 1;
}
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");
while (RegionStack.size() > ParentIndex) {
SourceMappingRegion &Region = RegionStack.back();
if (Region.hasStartLoc()) {
SourceLocation StartLoc = Region.getBeginLoc();
SourceLocation EndLoc = Region.hasEndLoc()
? Region.getEndLoc()
: RegionStack[ParentIndex].getEndLoc();
bool isBranch = Region.isBranch();
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. If the
// region is not a branch region, create a separate region for each
// expansion, and for all regions, update the EndLoc. Branch
// regions should not be split in order to keep a straightforward
// correspondance between the region and its associated branch
// condition, even if the condition spans multiple depths.
SourceLocation NestedLoc = getStartOfFileOrMacro(EndLoc);
assert(SM.isWrittenInSameFile(NestedLoc, EndLoc));
if (!isBranch && !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 ends in a nested file or macro expansion. If the
// region is not a branch region, create a separate region for each
// expansion, and for all regions, update the StartLoc. Branch
// regions should not be split in order to keep a straightforward
// correspondance between the region and its associated branch
// condition, even if the condition spans multiple depths.
SourceLocation NestedLoc = getEndOfFileOrMacro(StartLoc);
assert(SM.isWrittenInSameFile(StartLoc, NestedLoc));
if (!isBranch && !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);
if (!isBranch) {
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);
}
RegionStack.pop_back();
}
}
/// 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;
}
/// Determine whether the given condition can be constant folded.
bool ConditionFoldsToBool(const Expr *Cond) {
Expr::EvalResult Result;
return (Cond->EvaluateAsInt(Result, CVM.getCodeGenModule().getContext()));
}
/// Create a Branch Region around an instrumentable condition for coverage
/// and add it to the function's SourceRegions. A branch region tracks a
/// "True" counter and a "False" counter for boolean expressions that
/// result in the generation of a branch.
void createBranchRegion(const Expr *C, Counter TrueCnt, Counter FalseCnt) {
// Check for NULL conditions.
if (!C)
return;
// Ensure we are an instrumentable condition (i.e. no "&&" or "||"). Push
// region onto RegionStack but immediately pop it (which adds it to the
// function's SourceRegions) because it doesn't apply to any other source
// code other than the Condition.
if (CodeGenFunction::isInstrumentedCondition(C)) {
// If a condition can fold to true or false, the corresponding branch
// will be removed. Create a region with both counters hard-coded to
// zero. This allows us to visualize them in a special way.
// Alternatively, we can prevent any optimization done via
// constant-folding by ensuring that ConstantFoldsToSimpleInteger() in
// CodeGenFunction.c always returns false, but that is very heavy-handed.
if (ConditionFoldsToBool(C))
popRegions(pushRegion(Counter::getZero(), getStart(C), getEnd(C),
Counter::getZero()));
else
// Otherwise, create a region with the True counter and False counter.
popRegions(pushRegion(TrueCnt, getStart(C), getEnd(C), FalseCnt));
}
}
/// Create a Branch Region around a SwitchCase for code coverage
/// and add it to the function's SourceRegions.
void createSwitchCaseRegion(const SwitchCase *SC, Counter TrueCnt,
Counter FalseCnt) {
// Push region onto RegionStack but immediately pop it (which adds it to
// the function's SourceRegions) because it doesn't apply to any other
// source other than the SwitchCase.
popRegions(pushRegion(TrueCnt, getStart(SC), SC->getColonLoc(), FalseCnt));
}
/// Check whether a region with bounds \c StartLoc and \c EndLoc
/// is already added to \c SourceRegions.
bool isRegionAlreadyAdded(SourceLocation StartLoc, SourceLocation EndLoc,
bool isBranch = false) {
return llvm::any_of(
llvm::reverse(SourceRegions), [&](const SourceMappingRegion &Region) {
return Region.getBeginLoc() == StartLoc &&
Region.getEndLoc() == EndLoc && Region.isBranch() == isBranch;
});
}
/// 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, getRegion().isBranch()))
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) {
if (I.isBranch())
SourceRegions.emplace_back(I.getCounter(), I.getFalseCounter(), Loc,
getEndOfFileOrMacro(Loc), I.isBranch());
else
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);
}
/// 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());
HasTerminateStmt = true;
}
/// Find a valid gap range between \p AfterLoc and \p BeforeLoc.
Optional<SourceRange> findGapAreaBetween(SourceLocation AfterLoc,
SourceLocation BeforeLoc) {
// If AfterLoc is in function-like macro, use the right parenthesis
// location.
if (AfterLoc.isMacroID()) {
FileID FID = SM.getFileID(AfterLoc);
const SrcMgr::ExpansionInfo *EI = &SM.getSLocEntry(FID).getExpansion();
if (EI->isFunctionMacroExpansion())
AfterLoc = EI->getExpansionLocEnd();
}
size_t StartDepth = locationDepth(AfterLoc);
size_t EndDepth = locationDepth(BeforeLoc);
while (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc)) {
bool UnnestStart = StartDepth >= EndDepth;
bool UnnestEnd = EndDepth >= StartDepth;
if (UnnestEnd) {
assert(SM.isWrittenInSameFile(getStartOfFileOrMacro(BeforeLoc),
BeforeLoc));
BeforeLoc = getIncludeOrExpansionLoc(BeforeLoc);
assert(BeforeLoc.isValid());
EndDepth--;
}
if (UnnestStart) {
assert(SM.isWrittenInSameFile(AfterLoc,
getEndOfFileOrMacro(AfterLoc)));
AfterLoc = getIncludeOrExpansionLoc(AfterLoc);
assert(AfterLoc.isValid());
AfterLoc = getPreciseTokenLocEnd(AfterLoc);
assert(AfterLoc.isValid());
StartDepth--;
}
}
AfterLoc = getPreciseTokenLocEnd(AfterLoc);
// 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) ||
!SpellingRegion(SM, AfterLoc, BeforeLoc).isInSourceOrder())
return None;
return {{AfterLoc, BeforeLoc}};
}
/// 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) {}
/// 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->getBeginLoc().isValid())
extendRegion(S);
const Stmt *LastStmt = nullptr;
bool SaveTerminateStmt = HasTerminateStmt;
HasTerminateStmt = false;
GapRegionCounter = Counter::getZero();
for (const Stmt *Child : S->children())
if (Child) {
// If last statement contains terminate statements, add a gap area
// between the two statements. Skipping attributed statements, because
// they don't have valid start location.
if (LastStmt && HasTerminateStmt && !isa<AttributedStmt>(Child)) {
auto Gap = findGapAreaBetween(getEnd(LastStmt), getStart(Child));
if (Gap)
fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(),
GapRegionCounter);
SaveTerminateStmt = true;
HasTerminateStmt = false;
}
this->Visit(Child);
LastStmt = Child;
}
if (SaveTerminateStmt)
HasTerminateStmt = true;
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;
// 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))