+class MCAsmBackend;
+class MCContext;
+class MCObjectStreamer;
+class MCSection;
+class MCStreamer;
+class MCSymbol;
+class SourceMgr;
+class SMLoc;
+
+/// MCDwarfFile - Instances of this class represent the name of the dwarf
+/// .file directive and its associated dwarf file number in the MC file,
+/// and MCDwarfFile's are created and unique'd by the MCContext class where
+/// the file number for each is its index into the vector of DwarfFiles (note
+/// index 0 is not used and not a valid dwarf file number).
+struct MCDwarfFile {
+ // Name - the base name of the file without its directory path.
+ // The StringRef references memory allocated in the MCContext.
+ std::string Name;
+
+ // DirIndex - the index into the list of directory names for this file name.
+ unsigned DirIndex;
+};
+
+/// MCDwarfLoc - Instances of this class represent the information from a
+/// dwarf .loc directive.
+class MCDwarfLoc {
+ // FileNum - the file number.
+ unsigned FileNum;
+ // Line - the line number.
+ unsigned Line;
+ // Column - the column position.
+ unsigned Column;
+ // Flags (see #define's below)
+ unsigned Flags;
+ // Isa
+ unsigned Isa;
+ // Discriminator
+ unsigned Discriminator;
+
+// Flag that indicates the initial value of the is_stmt_start flag.
+#define DWARF2_LINE_DEFAULT_IS_STMT 1
+
+#define DWARF2_FLAG_IS_STMT (1 << 0)
+#define DWARF2_FLAG_BASIC_BLOCK (1 << 1)
+#define DWARF2_FLAG_PROLOGUE_END (1 << 2)
+#define DWARF2_FLAG_EPILOGUE_BEGIN (1 << 3)
+
+private: // MCContext manages these
+ friend class MCContext;
+ friend class MCLineEntry;
+ MCDwarfLoc(unsigned fileNum, unsigned line, unsigned column, unsigned flags,
+ unsigned isa, unsigned discriminator)
+ : FileNum(fileNum), Line(line), Column(column), Flags(flags), Isa(isa),
+ Discriminator(discriminator) {}
+
+ // Allow the default copy constructor and assignment operator to be used
+ // for an MCDwarfLoc object.
+
+public:
+ /// getFileNum - Get the FileNum of this MCDwarfLoc.
+ unsigned getFileNum() const { return FileNum; }
+
+ /// getLine - Get the Line of this MCDwarfLoc.
+ unsigned getLine() const { return Line; }
+
+ /// getColumn - Get the Column of this MCDwarfLoc.
+ unsigned getColumn() const { return Column; }
+
+ /// getFlags - Get the Flags of this MCDwarfLoc.
+ unsigned getFlags() const { return Flags; }
+
+ /// getIsa - Get the Isa of this MCDwarfLoc.
+ unsigned getIsa() const { return Isa; }
+
+ /// getDiscriminator - Get the Discriminator of this MCDwarfLoc.
+ unsigned getDiscriminator() const { return Discriminator; }
+
+ /// setFileNum - Set the FileNum of this MCDwarfLoc.
+ void setFileNum(unsigned fileNum) { FileNum = fileNum; }
+
+ /// setLine - Set the Line of this MCDwarfLoc.
+ void setLine(unsigned line) { Line = line; }
+
+ /// setColumn - Set the Column of this MCDwarfLoc.
+ void setColumn(unsigned column) { Column = column; }
+
+ /// setFlags - Set the Flags of this MCDwarfLoc.
+ void setFlags(unsigned flags) { Flags = flags; }
+
+ /// setIsa - Set the Isa of this MCDwarfLoc.
+ void setIsa(unsigned isa) { Isa = isa; }
+
+ /// setDiscriminator - Set the Discriminator of this MCDwarfLoc.
+ void setDiscriminator(unsigned discriminator) {
+ Discriminator = discriminator;
+ }
+};
+
+/// MCLineEntry - Instances of this class represent the line information for
+/// the dwarf line table entries. Which is created after a machine
+/// instruction is assembled and uses an address from a temporary label
+/// created at the current address in the current section and the info from
+/// the last .loc directive seen as stored in the context.
+class MCLineEntry : public MCDwarfLoc {
+ MCSymbol *Label;
+
+private:
+ // Allow the default copy constructor and assignment operator to be used
+ // for an MCLineEntry object.
+
+public:
+ // Constructor to create an MCLineEntry given a symbol and the dwarf loc.
+ MCLineEntry(MCSymbol *label, const MCDwarfLoc loc)
+ : MCDwarfLoc(loc), Label(label) {}
+
+ MCSymbol *getLabel() const { return Label; }
+
+ // This is called when an instruction is assembled into the specified
+ // section and if there is information from the last .loc directive that
+ // has yet to have a line entry made for it is made.
+ static void Make(MCObjectStreamer *MCOS, const MCSection *Section);
+};
+
+/// MCLineSection - Instances of this class represent the line information
+/// for a compile unit where machine instructions have been assembled after seeing
+/// .loc directives. This is the information used to build the dwarf line
+/// table for a section.
+class MCLineSection {
+public:
+ // addLineEntry - adds an entry to this MCLineSection's line entries
+ void addLineEntry(const MCLineEntry &LineEntry, const MCSection *Sec) {
+ MCLineDivisions[Sec].push_back(LineEntry);
+ }
+
+ typedef std::vector<MCLineEntry> MCLineEntryCollection;
+ typedef MCLineEntryCollection::iterator iterator;
+ typedef MCLineEntryCollection::const_iterator const_iterator;
+ typedef MapVector<const MCSection *, MCLineEntryCollection> MCLineDivisionMap;
+
+private:
+ // A collection of MCLineEntry for each section.
+ MCLineDivisionMap MCLineDivisions;
+
+public:
+ // Returns the collection of MCLineEntry for a given Compile Unit ID.
+ const MCLineDivisionMap &getMCLineEntries() const {
+ return MCLineDivisions;
+ }
+};
+
+struct MCDwarfLineTableHeader {
+ MCSymbol *Label;
+ SmallVector<std::string, 3> MCDwarfDirs;
+ SmallVector<MCDwarfFile, 3> MCDwarfFiles;
+ StringMap<unsigned> SourceIdMap;
+ StringRef CompilationDir;
+
+ MCDwarfLineTableHeader() : Label(nullptr) {}
+ unsigned getFile(StringRef &Directory, StringRef &FileName,
+ unsigned FileNumber = 0);
+ std::pair<MCSymbol *, MCSymbol *> Emit(MCStreamer *MCOS) const;
+ std::pair<MCSymbol *, MCSymbol *>
+ Emit(MCStreamer *MCOS, ArrayRef<char> SpecialOpcodeLengths) const;
+};
+
+class MCDwarfDwoLineTable {
+ MCDwarfLineTableHeader Header;
+public:
+ void setCompilationDir(StringRef CompilationDir) {
+ Header.CompilationDir = CompilationDir;
+ }
+ unsigned getFile(StringRef Directory, StringRef FileName) {
+ return Header.getFile(Directory, FileName);
+ }
+ void Emit(MCStreamer &MCOS) const;
+};
+
+class MCDwarfLineTable {
+ MCDwarfLineTableHeader Header;
+ MCLineSection MCLineSections;
+
+public:
+ // This emits the Dwarf file and the line tables for all Compile Units.
+ static void Emit(MCObjectStreamer *MCOS);
+
+ // This emits the Dwarf file and the line tables for a given Compile Unit.
+ void EmitCU(MCObjectStreamer *MCOS) const;
+
+ unsigned getFile(StringRef &Directory, StringRef &FileName,
+ unsigned FileNumber = 0);
+
+ MCSymbol *getLabel() const {
+ return Header.Label;
+ }
+
+ void setLabel(MCSymbol *Label) {
+ Header.Label = Label;
+ }
+
+ void setCompilationDir(StringRef CompilationDir) {
+ Header.CompilationDir = CompilationDir;
+ }
+
+ const SmallVectorImpl<std::string> &getMCDwarfDirs() const {
+ return Header.MCDwarfDirs;
+ }
+
+ SmallVectorImpl<std::string> &getMCDwarfDirs() {
+ return Header.MCDwarfDirs;
+ }
+
+ const SmallVectorImpl<MCDwarfFile> &getMCDwarfFiles() const {
+ return Header.MCDwarfFiles;
+ }
+
+ SmallVectorImpl<MCDwarfFile> &getMCDwarfFiles() {
+ return Header.MCDwarfFiles;
+ }
+
+ const MCLineSection &getMCLineSections() const {
+ return MCLineSections;
+ }
+ MCLineSection &getMCLineSections() {
+ return MCLineSections;
+ }
+};
+
+class MCDwarfLineAddr {
+public:
+ /// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas.
+ static void Encode(MCContext &Context, int64_t LineDelta, uint64_t AddrDelta,
+ raw_ostream &OS);
+
+ /// Utility function to emit the encoding to a streamer.
+ static void Emit(MCStreamer *MCOS, int64_t LineDelta, uint64_t AddrDelta);
+};
+
+class MCGenDwarfInfo {
+public:
+ //
+ // When generating dwarf for assembly source files this emits the Dwarf
+ // sections.
+ //
+ static void Emit(MCStreamer *MCOS);
+};
+
+// When generating dwarf for assembly source files this is the info that is
+// needed to be gathered for each symbol that will have a dwarf label.
+class MCGenDwarfLabelEntry {
+private:
+ // Name of the symbol without a leading underbar, if any.
+ StringRef Name;
+ // The dwarf file number this symbol is in.
+ unsigned FileNumber;
+ // The line number this symbol is at.
+ unsigned LineNumber;
+ // The low_pc for the dwarf label is taken from this symbol.
+ MCSymbol *Label;
+
+public:
+ MCGenDwarfLabelEntry(StringRef name, unsigned fileNumber, unsigned lineNumber,
+ MCSymbol *label)
+ : Name(name), FileNumber(fileNumber), LineNumber(lineNumber),
+ Label(label) {}
+
+ StringRef getName() const { return Name; }
+ unsigned getFileNumber() const { return FileNumber; }
+ unsigned getLineNumber() const { return LineNumber; }
+ MCSymbol *getLabel() const { return Label; }
+
+ // This is called when label is created when we are generating dwarf for
+ // assembly source files.
+ static void Make(MCSymbol *Symbol, MCStreamer *MCOS, SourceMgr &SrcMgr,
+ SMLoc &Loc);
+};
+
+class MCCFIInstruction {
+public:
+ enum OpType {
+ OpSameValue,
+ OpRememberState,
+ OpRestoreState,
+ OpOffset,
+ OpDefCfaRegister,
+ OpDefCfaOffset,
+ OpDefCfa,
+ OpRelOffset,
+ OpAdjustCfaOffset,
+ OpEscape,
+ OpRestore,
+ OpUndefined,
+ OpRegister,
+ OpWindowSave