+ /// 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(MCStreamer *MCOS, const MCSection *Section);
+ };
+
+ /// MCLineSection - Instances of this class represent the line information
+ /// for a section 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 {
+
+ private:
+ MCLineSection(const MCLineSection&) LLVM_DELETED_FUNCTION;
+ void operator=(const MCLineSection&) LLVM_DELETED_FUNCTION;
+
+ public:
+ // Constructor to create an MCLineSection with an empty MCLineEntries
+ // vector.
+ MCLineSection() {}
+
+ // addLineEntry - adds an entry to this MCLineSection's line entries
+ void addLineEntry(const MCLineEntry &LineEntry) {
+ MCLineEntries.push_back(LineEntry);
+ }
+
+ typedef std::vector<MCLineEntry> MCLineEntryCollection;
+ typedef MCLineEntryCollection::iterator iterator;
+ typedef MCLineEntryCollection::const_iterator const_iterator;
+
+ private:
+ MCLineEntryCollection MCLineEntries;
+
+ public:
+ const MCLineEntryCollection *getMCLineEntries() const {
+ return &MCLineEntries;
+ }
+ };
+
+ class MCDwarfFileTable {
+ public:
+ //
+ // This emits the Dwarf file and the line tables.
+ //
+ static const MCSymbol *Emit(MCStreamer *MCOS);
+ };
+
+ class MCDwarfLineAddr {
+ public:
+ /// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas.
+ static void Encode(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);
+
+ /// Utility function to write the encoding to an object writer.
+ static void Write(MCObjectWriter *OW,
+ 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, 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 { SameValue, RememberState, RestoreState, Move, RelMove, Escape,
+ Restore};
+ private:
+ OpType Operation;
+ MCSymbol *Label;
+ // Move to & from location.
+ MachineLocation Destination;
+ MachineLocation Source;
+ std::vector<char> Values;
+ public:
+ MCCFIInstruction(OpType Op, MCSymbol *L)
+ : Operation(Op), Label(L) {
+ assert(Op == RememberState || Op == RestoreState);
+ }
+ MCCFIInstruction(OpType Op, MCSymbol *L, unsigned Register)
+ : Operation(Op), Label(L), Destination(Register) {
+ assert(Op == SameValue || Op == Restore);
+ }
+ MCCFIInstruction(MCSymbol *L, const MachineLocation &D,
+ const MachineLocation &S)
+ : Operation(Move), Label(L), Destination(D), Source(S) {
+ }
+ MCCFIInstruction(OpType Op, MCSymbol *L, const MachineLocation &D,
+ const MachineLocation &S)
+ : Operation(Op), Label(L), Destination(D), Source(S) {
+ assert(Op == RelMove);
+ }
+ MCCFIInstruction(OpType Op, MCSymbol *L, StringRef Vals)
+ : Operation(Op), Label(L), Values(Vals.begin(), Vals.end()) {
+ assert(Op == Escape);
+ }
+ OpType getOperation() const { return Operation; }
+ MCSymbol *getLabel() const { return Label; }
+ const MachineLocation &getDestination() const { return Destination; }
+ const MachineLocation &getSource() const { return Source; }
+ const StringRef getValues() const {
+ 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);
+ };