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+//===---- CoverageMappingGen.h - 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_COVERAGEMAPPINGGEN_H
+#define LLVM_CLANG_LIB_CODEGEN_COVERAGEMAPPINGGEN_H
+
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Frontend/CodeGenOptions.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/StringMap.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;
+
+/// \brief 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;
+public:
+ ArrayRef<SourceRange> getSkippedRanges() const { return SkippedRanges; }
+
+ void SourceRangeSkipped(SourceRange Range) override;
+};
+
+namespace CodeGen {
+
+class CodeGenModule;
+
+/// \brief 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;
+ llvm::StructType *FunctionRecordTy;
+ std::string CoverageMappings;
+
+public:
+ CoverageMappingModuleGen(CodeGenModule &CGM, CoverageSourceInfo &SourceInfo)
+ : CGM(CGM), SourceInfo(SourceInfo), FunctionRecordTy(nullptr) {}
+
+ CoverageSourceInfo &getSourceInfo() const {
+ return SourceInfo;
+ }
+
+ /// \brief 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);
+
+ /// \brief Emit the coverage mapping data for a translation unit.
+ void emit();
+
+ /// \brief Return the coverage mapping translation unit file id
+ /// for the given file.
+ unsigned getFileID(const FileEntry *File);
+};
+
+/// \brief 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;
+
+public:
+ 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) {}
+
+ /// \brief 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);
+
+ /// \brief 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
+
+#endif