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//===---- CoverageMappingGen.h - Coverage mapping generation ----*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Instrumentation-based code coverage mapping generator
#include "clang/Basic/LLVM.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Lex/PPCallbacks.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/Support/raw_ostream.h"
namespace clang {
class LangOptions;
class SourceManager;
class FileEntry;
class Preprocessor;
class Decl;
class Stmt;
/// Stores additional source code information like skipped ranges which
/// is required by the coverage mapping generator and is obtained from
/// the preprocessor.
class CoverageSourceInfo : public PPCallbacks {
std::vector<SourceRange> SkippedRanges;
ArrayRef<SourceRange> getSkippedRanges() const { return SkippedRanges; }
void SourceRangeSkipped(SourceRange Range, SourceLocation EndifLoc) override;
namespace CodeGen {
class CodeGenModule;
/// Organizes the cross-function state that is used while generating
/// code coverage mapping data.
class CoverageMappingModuleGen {
CodeGenModule &CGM;
CoverageSourceInfo &SourceInfo;
llvm::SmallDenseMap<const FileEntry *, unsigned, 8> FileEntries;
std::vector<llvm::Constant *> FunctionRecords;
std::vector<llvm::Constant *> FunctionNames;
llvm::StructType *FunctionRecordTy;
std::vector<std::string> CoverageMappings;
SmallString<256> CWD;
/// Make the filename absolute, remove dots, and normalize slashes to local
/// path style.
std::string normalizeFilename(StringRef Filename);
CoverageMappingModuleGen(CodeGenModule &CGM, CoverageSourceInfo &SourceInfo);
CoverageSourceInfo &getSourceInfo() const {
return SourceInfo;
/// Add a function's coverage mapping record to the collection of the
/// function mapping records.
void addFunctionMappingRecord(llvm::GlobalVariable *FunctionName,
StringRef FunctionNameValue,
uint64_t FunctionHash,
const std::string &CoverageMapping,
bool IsUsed = true);
/// Emit the coverage mapping data for a translation unit.
void emit();
/// Return the coverage mapping translation unit file id
/// for the given file.
unsigned getFileID(const FileEntry *File);
/// Organizes the per-function state that is used while generating
/// code coverage mapping data.
class CoverageMappingGen {
CoverageMappingModuleGen &CVM;
SourceManager &SM;
const LangOptions &LangOpts;
llvm::DenseMap<const Stmt *, unsigned> *CounterMap;
CoverageMappingGen(CoverageMappingModuleGen &CVM, SourceManager &SM,
const LangOptions &LangOpts)
: CVM(CVM), SM(SM), LangOpts(LangOpts), CounterMap(nullptr) {}
CoverageMappingGen(CoverageMappingModuleGen &CVM, SourceManager &SM,
const LangOptions &LangOpts,
llvm::DenseMap<const Stmt *, unsigned> *CounterMap)
: CVM(CVM), SM(SM), LangOpts(LangOpts), CounterMap(CounterMap) {}
/// Emit the coverage mapping data which maps the regions of
/// code to counters that will be used to find the execution
/// counts for those regions.
void emitCounterMapping(const Decl *D, llvm::raw_ostream &OS);
/// Emit the coverage mapping data for an unused function.
/// It creates mapping regions with the counter of zero.
void emitEmptyMapping(const Decl *D, llvm::raw_ostream &OS);
} // end namespace CodeGen
} // end namespace clang