+
+ class MCGenDwarfInfo {
+ public:
+ //
+ // When generating dwarf for assembly source files this emits the Dwarf
+ // sections.
+ //
+ static void Emit(MCStreamer *MCOS, const MCSymbol *LineSectionSymbol);
+ };
+
+ // 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 };
+ private:
+ OpType Operation;
+ MCSymbol *Label;
+ unsigned Register;
+ union {
+ int Offset;
+ unsigned Register2;
+ };
+ std::vector<char> Values;
+
+ MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R, int O, StringRef V) :
+ Operation(Op), Label(L), Register(R), Offset(O),
+ Values(V.begin(), V.end()) {
+ assert(Op != OpRegister);
+ }
+
+ MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R1, unsigned R2) :
+ Operation(Op), Label(L), Register(R1), Register2(R2) {
+ assert(Op == OpRegister);
+ }
+
+ public:
+ static MCCFIInstruction
+ createOffset(MCSymbol *L, unsigned Register, int Offset) {
+ return MCCFIInstruction(OpOffset, L, Register, Offset, "");
+ }
+
+ static MCCFIInstruction
+ createDefCfaRegister(MCSymbol *L, unsigned Register) {
+ return MCCFIInstruction(OpDefCfaRegister, L, Register, 0, "");
+ }
+
+ static MCCFIInstruction createDefCfaOffset(MCSymbol *L, int Offset) {
+ return MCCFIInstruction(OpDefCfaOffset, L, 0, -Offset, "");
+ }
+
+ static MCCFIInstruction
+ createDefCfa(MCSymbol *L, unsigned Register, int Offset) {
+ return MCCFIInstruction(OpDefCfa, L, Register, -Offset, "");
+ }
+
+ static MCCFIInstruction createUndefined(MCSymbol *L, unsigned Register) {
+ return MCCFIInstruction(OpUndefined, L, Register, 0, "");
+ }
+
+ static MCCFIInstruction createRestore(MCSymbol *L, unsigned Register) {
+ return MCCFIInstruction(OpRestore, L, Register, 0, "");
+ }
+
+ static MCCFIInstruction createSameValue(MCSymbol *L, unsigned Register) {
+ return MCCFIInstruction(OpSameValue, L, Register, 0, "");
+ }
+
+ static MCCFIInstruction createRestoreState(MCSymbol *L) {
+ return MCCFIInstruction(OpRestoreState, L, 0, 0, "");
+ }
+
+ static MCCFIInstruction createRememberState(MCSymbol *L) {
+ return MCCFIInstruction(OpRememberState, L, 0, 0, "");
+ }
+
+ static MCCFIInstruction
+ createRelOffset(MCSymbol *L, unsigned Register, int Offset) {
+ return MCCFIInstruction(OpRelOffset, L, Register, Offset, "");
+ }
+
+ static MCCFIInstruction
+ createAdjustCfaOffset(MCSymbol *L, int Adjustment) {
+ return MCCFIInstruction(OpAdjustCfaOffset, L, 0, Adjustment, "");
+ }
+
+ static MCCFIInstruction createEscape(MCSymbol *L, StringRef Vals) {
+ return MCCFIInstruction(OpEscape, L, 0, 0, Vals);
+ }
+
+ static MCCFIInstruction
+ createRegister(MCSymbol *L, unsigned Register1, unsigned Register2) {
+ return MCCFIInstruction(OpRegister, L, Register1, Register2);
+ }
+
+ OpType getOperation() const { return Operation; }
+ MCSymbol *getLabel() const { return Label; }
+
+ unsigned getRegister() const {
+ assert(Operation == OpDefCfa || Operation == OpOffset ||
+ Operation == OpRestore || Operation == OpUndefined ||
+ Operation == OpSameValue || Operation == OpDefCfaRegister ||
+ Operation == OpRelOffset || Operation == OpRegister);
+ return Register;
+ }
+
+ unsigned getRegister2() const {
+ assert(Operation == OpRegister);
+ return Register2;
+ }
+
+ int getOffset() const {
+ assert(Operation == OpDefCfa || Operation == OpOffset ||
+ Operation == OpRelOffset || Operation == OpDefCfaOffset ||
+ Operation == OpAdjustCfaOffset);
+ return Offset;
+ }
+
+ const StringRef getValues() const {
+ assert(Operation == OpEscape);
+ return StringRef(&Values[0], Values.size());
+ }
+ };
+
+ struct MCDwarfFrameInfo {
+ MCDwarfFrameInfo() : Begin(0), End(0), Personality(0), Lsda(0),
+ Function(0), Instructions(), PersonalityEncoding(),
+ LsdaEncoding(0), CompactUnwindEncoding(0),
+ IsSignalFrame(false) {}
+ MCSymbol *Begin;
+ MCSymbol *End;
+ const MCSymbol *Personality;
+ const MCSymbol *Lsda;
+ const MCSymbol *Function;
+ std::vector<MCCFIInstruction> Instructions;
+ unsigned PersonalityEncoding;
+ unsigned LsdaEncoding;
+ uint32_t CompactUnwindEncoding;
+ bool IsSignalFrame;
+ };
+
+ class MCDwarfFrameEmitter {
+ public:
+ //
+ // This emits the frame info section.
+ //
+ static void Emit(MCStreamer &streamer, bool usingCFI,
+ bool isEH);
+ static void EmitAdvanceLoc(MCStreamer &Streamer, uint64_t AddrDelta);
+ static void EncodeAdvanceLoc(uint64_t AddrDelta, raw_ostream &OS);
+ };