+static int getDataAlignmentFactor(MCStreamer &streamer) {
+ MCContext &context = streamer.getContext();
+ const MCAsmInfo &asmInfo = context.getAsmInfo();
+ int size = asmInfo.getPointerSize();
+ if (asmInfo.isStackGrowthDirectionUp())
+ return size;
+ else
+ return -size;
+}
+
+static unsigned getSizeForEncoding(MCStreamer &streamer,
+ unsigned symbolEncoding) {
+ MCContext &context = streamer.getContext();
+ unsigned format = symbolEncoding & 0x0f;
+ switch (format) {
+ default:
+ assert(0 && "Unknown Encoding");
+ case dwarf::DW_EH_PE_absptr:
+ case dwarf::DW_EH_PE_signed:
+ return context.getAsmInfo().getPointerSize();
+ case dwarf::DW_EH_PE_udata2:
+ case dwarf::DW_EH_PE_sdata2:
+ return 2;
+ case dwarf::DW_EH_PE_udata4:
+ case dwarf::DW_EH_PE_sdata4:
+ return 4;
+ case dwarf::DW_EH_PE_udata8:
+ case dwarf::DW_EH_PE_sdata8:
+ return 8;
+ }
+}
+
+static void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol,
+ unsigned symbolEncoding, const char *comment = 0) {
+ MCContext &context = streamer.getContext();
+ const MCAsmInfo &asmInfo = context.getAsmInfo();
+ const MCExpr *v = asmInfo.getExprForFDESymbol(&symbol,
+ symbolEncoding,
+ streamer);
+ unsigned size = getSizeForEncoding(streamer, symbolEncoding);
+ if (streamer.isVerboseAsm() && comment) streamer.AddComment(comment);
+ streamer.EmitAbsValue(v, size);
+}
+
+static void EmitPersonality(MCStreamer &streamer, const MCSymbol &symbol,
+ unsigned symbolEncoding) {
+ MCContext &context = streamer.getContext();
+ const MCAsmInfo &asmInfo = context.getAsmInfo();
+ const MCExpr *v = asmInfo.getExprForPersonalitySymbol(&symbol,
+ symbolEncoding,
+ streamer);
+ unsigned size = getSizeForEncoding(streamer, symbolEncoding);
+ streamer.EmitValue(v, size);
+}
+
+static const MachineLocation TranslateMachineLocation(
+ const MCRegisterInfo &MRI,
+ const MachineLocation &Loc) {
+ unsigned Reg = Loc.getReg() == MachineLocation::VirtualFP ?
+ MachineLocation::VirtualFP :
+ unsigned(MRI.getDwarfRegNum(Loc.getReg(), true));
+ const MachineLocation &NewLoc = Loc.isReg() ?
+ MachineLocation(Reg) : MachineLocation(Reg, Loc.getOffset());
+ return NewLoc;
+}
+
+namespace {
+ class FrameEmitterImpl {
+ int CFAOffset;
+ int CIENum;
+ bool UsingCFI;
+ bool IsEH;
+ const MCSymbol *SectionStart;
+ public:
+ FrameEmitterImpl(bool usingCFI, bool isEH)
+ : CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
+ SectionStart(0) {}
+
+ void setSectionStart(const MCSymbol *Label) { SectionStart = Label; }
+
+ /// EmitCompactUnwind - Emit the unwind information in a compact way. If
+ /// we're successful, return 'true'. Otherwise, return 'false' and it will
+ /// emit the normal CIE and FDE.
+ bool EmitCompactUnwind(MCStreamer &streamer,
+ const MCDwarfFrameInfo &frame);
+
+ const MCSymbol &EmitCIE(MCStreamer &streamer,
+ const MCSymbol *personality,
+ unsigned personalityEncoding,
+ const MCSymbol *lsda,
+ unsigned lsdaEncoding);
+ MCSymbol *EmitFDE(MCStreamer &streamer,
+ const MCSymbol &cieStart,
+ const MCDwarfFrameInfo &frame);
+ void EmitCFIInstructions(MCStreamer &streamer,
+ const std::vector<MCCFIInstruction> &Instrs,
+ MCSymbol *BaseLabel);
+ void EmitCFIInstruction(MCStreamer &Streamer,
+ const MCCFIInstruction &Instr);
+ };
+
+} // end anonymous namespace
+
+static void EmitEncodingByte(MCStreamer &Streamer, unsigned Encoding,
+ StringRef Prefix) {
+ if (Streamer.isVerboseAsm()) {
+ const char *EncStr = 0;
+ switch (Encoding) {
+ default: EncStr = "<unknown encoding>";
+ case dwarf::DW_EH_PE_absptr: EncStr = "absptr";
+ case dwarf::DW_EH_PE_omit: EncStr = "omit";
+ case dwarf::DW_EH_PE_pcrel: EncStr = "pcrel";
+ case dwarf::DW_EH_PE_udata4: EncStr = "udata4";
+ case dwarf::DW_EH_PE_udata8: EncStr = "udata8";
+ case dwarf::DW_EH_PE_sdata4: EncStr = "sdata4";
+ case dwarf::DW_EH_PE_sdata8: EncStr = "sdata8";
+ case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4: EncStr = "pcrel udata4";
+ case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4: EncStr = "pcrel sdata4";
+ case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8: EncStr = "pcrel udata8";
+ case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8: EncStr = "pcrel sdata8";
+ case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata4:
+ EncStr = "indirect pcrel udata4";
+ case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata4:
+ EncStr = "indirect pcrel sdata4";
+ case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata8:
+ EncStr = "indirect pcrel udata8";
+ case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata8:
+ EncStr = "indirect pcrel sdata8";
+ }
+
+ Streamer.AddComment(Twine(Prefix) + " = " + EncStr);
+ }
+
+ Streamer.EmitIntValue(Encoding, 1);
+}
+
+void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
+ const MCCFIInstruction &Instr) {
+ int dataAlignmentFactor = getDataAlignmentFactor(Streamer);
+ bool VerboseAsm = Streamer.isVerboseAsm();
+
+ switch (Instr.getOperation()) {
+ case MCCFIInstruction::Move:
+ case MCCFIInstruction::RelMove: {
+ const MachineLocation &Dst = Instr.getDestination();
+ const MachineLocation &Src = Instr.getSource();
+ const bool IsRelative = Instr.getOperation() == MCCFIInstruction::RelMove;
+
+ // If advancing cfa.
+ if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
+ if (Src.getReg() == MachineLocation::VirtualFP) {
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_offset");
+ Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1);
+ } else {
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa");
+ Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") +
+ Twine(Src.getReg()));
+ Streamer.EmitULEB128IntValue(Src.getReg());
+ }
+
+ if (IsRelative)
+ CFAOffset += Src.getOffset();
+ else
+ CFAOffset = -Src.getOffset();
+
+ if (VerboseAsm) Streamer.AddComment(Twine("Offset " + Twine(CFAOffset)));
+ Streamer.EmitULEB128IntValue(CFAOffset);
+ return;
+ }
+
+ if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
+ assert(Dst.isReg() && "Machine move not supported yet.");
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_register");
+ Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Dst.getReg()));
+ Streamer.EmitULEB128IntValue(Dst.getReg());
+ return;
+ }
+
+ unsigned Reg = Src.getReg();
+ int Offset = Dst.getOffset();
+ if (IsRelative)
+ Offset -= CFAOffset;
+ Offset = Offset / dataAlignmentFactor;
+
+ if (Offset < 0) {
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended_sf");
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
+ Streamer.EmitULEB128IntValue(Reg);
+ if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
+ Streamer.EmitSLEB128IntValue(Offset);
+ } else if (Reg < 64) {
+ if (VerboseAsm) Streamer.AddComment(Twine("DW_CFA_offset + Reg(") +
+ Twine(Reg) + ")");
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
+ Streamer.EmitULEB128IntValue(Offset);
+ } else {
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended");
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
+ Streamer.EmitULEB128IntValue(Reg);
+ if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
+ Streamer.EmitULEB128IntValue(Offset);
+ }
+ return;
+ }
+ case MCCFIInstruction::Remember:
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_remember_state");
+ Streamer.EmitIntValue(dwarf::DW_CFA_remember_state, 1);
+ return;
+ case MCCFIInstruction::Restore:
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_restore_state");
+ Streamer.EmitIntValue(dwarf::DW_CFA_restore_state, 1);
+ return;
+ case MCCFIInstruction::SameValue: {
+ unsigned Reg = Instr.getDestination().getReg();
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_same_value");
+ Streamer.EmitIntValue(dwarf::DW_CFA_same_value, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
+ Streamer.EmitULEB128IntValue(Reg);
+ return;
+ }
+ }
+ llvm_unreachable("Unhandled case in switch");
+}
+
+/// EmitFrameMoves - Emit frame instructions to describe the layout of the
+/// frame.
+void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer,
+ const std::vector<MCCFIInstruction> &Instrs,
+ MCSymbol *BaseLabel) {
+ for (unsigned i = 0, N = Instrs.size(); i < N; ++i) {
+ const MCCFIInstruction &Instr = Instrs[i];
+ MCSymbol *Label = Instr.getLabel();
+ // Throw out move if the label is invalid.
+ if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
+
+ // Advance row if new location.
+ if (BaseLabel && Label) {
+ MCSymbol *ThisSym = Label;
+ if (ThisSym != BaseLabel) {
+ if (streamer.isVerboseAsm()) streamer.AddComment("DW_CFA_advance_loc4");
+ streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym);
+ BaseLabel = ThisSym;
+ }
+ }
+
+ EmitCFIInstruction(streamer, Instr);
+ }
+}
+
+/// EmitCompactUnwind - Emit the unwind information in a compact way. If we're
+/// successful, return 'true'. Otherwise, return 'false' and it will emit the
+/// normal CIE and FDE.
+bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
+ const MCDwarfFrameInfo &Frame) {
+ MCContext &Context = Streamer.getContext();
+ const MCObjectFileInfo *MOFI = Context.getObjectFileInfo();
+ bool VerboseAsm = Streamer.isVerboseAsm();
+
+ // range-start range-length compact-unwind-enc personality-func lsda
+ // _foo LfooEnd-_foo 0x00000023 0 0
+ // _bar LbarEnd-_bar 0x00000025 __gxx_personality except_tab1
+ //
+ // .section __LD,__compact_unwind,regular,debug
+ //
+ // # compact unwind for _foo
+ // .quad _foo
+ // .set L1,LfooEnd-_foo
+ // .long L1
+ // .long 0x01010001
+ // .quad 0
+ // .quad 0
+ //
+ // # compact unwind for _bar
+ // .quad _bar
+ // .set L2,LbarEnd-_bar
+ // .long L2
+ // .long 0x01020011
+ // .quad __gxx_personality
+ // .quad except_tab1
+
+ uint32_t Encoding = Frame.CompactUnwindEncoding;
+ if (!Encoding) return false;
+
+ // The encoding needs to know we have an LSDA.
+ if (Frame.Lsda)
+ Encoding |= 0x40000000;
+
+ Streamer.SwitchSection(MOFI->getCompactUnwindSection());
+
+ // Range Start
+ unsigned FDEEncoding = MOFI->getFDEEncoding(UsingCFI);
+ unsigned Size = getSizeForEncoding(Streamer, FDEEncoding);
+ if (VerboseAsm) Streamer.AddComment("Range Start");
+ Streamer.EmitSymbolValue(Frame.Function, Size);
+
+ // Range Length
+ const MCExpr *Range = MakeStartMinusEndExpr(Streamer, *Frame.Begin,
+ *Frame.End, 0);
+ if (VerboseAsm) Streamer.AddComment("Range Length");
+ Streamer.EmitAbsValue(Range, 4);
+
+ // Compact Encoding
+ Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_udata4);
+ if (VerboseAsm) Streamer.AddComment(Twine("Compact Unwind Encoding: 0x") +
+ Twine(llvm::utohexstr(Encoding)));
+ Streamer.EmitIntValue(Encoding, Size);
+
+
+ // Personality Function
+ Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_absptr);
+ if (VerboseAsm) Streamer.AddComment("Personality Function");
+ if (Frame.Personality)
+ Streamer.EmitSymbolValue(Frame.Personality, Size);
+ else
+ Streamer.EmitIntValue(0, Size); // No personality fn
+
+ // LSDA
+ Size = getSizeForEncoding(Streamer, Frame.LsdaEncoding);
+ if (VerboseAsm) Streamer.AddComment("LSDA");
+ if (Frame.Lsda)
+ Streamer.EmitSymbolValue(Frame.Lsda, Size);
+ else
+ Streamer.EmitIntValue(0, Size); // No LSDA
+
+ return true;
+}
+
+const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
+ const MCSymbol *personality,
+ unsigned personalityEncoding,
+ const MCSymbol *lsda,
+ unsigned lsdaEncoding) {
+ MCContext &context = streamer.getContext();
+ const MCRegisterInfo &MRI = context.getRegisterInfo();
+ const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
+ bool verboseAsm = streamer.isVerboseAsm();
+
+ MCSymbol *sectionStart;
+ if (MOFI->isFunctionEHFrameSymbolPrivate() || !IsEH)
+ sectionStart = context.CreateTempSymbol();
+ else
+ sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum));
+
+ streamer.EmitLabel(sectionStart);
+ CIENum++;
+
+ MCSymbol *sectionEnd = context.CreateTempSymbol();
+
+ // Length
+ const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart,
+ *sectionEnd, 4);
+ if (verboseAsm) streamer.AddComment("CIE Length");
+ streamer.EmitAbsValue(Length, 4);
+
+ // CIE ID
+ unsigned CIE_ID = IsEH ? 0 : -1;
+ if (verboseAsm) streamer.AddComment("CIE ID Tag");
+ streamer.EmitIntValue(CIE_ID, 4);
+
+ // Version
+ if (verboseAsm) streamer.AddComment("DW_CIE_VERSION");
+ streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1);
+
+ // Augmentation String
+ SmallString<8> Augmentation;
+ if (IsEH) {
+ if (verboseAsm) streamer.AddComment("CIE Augmentation");
+ Augmentation += "z";
+ if (personality)
+ Augmentation += "P";
+ if (lsda)
+ Augmentation += "L";
+ Augmentation += "R";
+ streamer.EmitBytes(Augmentation.str(), 0);
+ }
+ streamer.EmitIntValue(0, 1);
+
+ // Code Alignment Factor
+ if (verboseAsm) streamer.AddComment("CIE Code Alignment Factor");
+ streamer.EmitULEB128IntValue(1);
+
+ // Data Alignment Factor
+ if (verboseAsm) streamer.AddComment("CIE Data Alignment Factor");
+ streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer));
+
+ // Return Address Register
+ if (verboseAsm) streamer.AddComment("CIE Return Address Column");
+ streamer.EmitULEB128IntValue(MRI.getDwarfRegNum(MRI.getRARegister(), true));
+
+ // Augmentation Data Length (optional)
+
+ unsigned augmentationLength = 0;
+ if (IsEH) {
+ if (personality) {
+ // Personality Encoding
+ augmentationLength += 1;
+ // Personality
+ augmentationLength += getSizeForEncoding(streamer, personalityEncoding);
+ }
+ if (lsda)
+ augmentationLength += 1;
+ // Encoding of the FDE pointers
+ augmentationLength += 1;
+
+ if (verboseAsm) streamer.AddComment("Augmentation Size");
+ streamer.EmitULEB128IntValue(augmentationLength);
+
+ // Augmentation Data (optional)
+ if (personality) {
+ // Personality Encoding
+ EmitEncodingByte(streamer, personalityEncoding,
+ "Personality Encoding");
+ // Personality
+ if (verboseAsm) streamer.AddComment("Personality");
+ EmitPersonality(streamer, *personality, personalityEncoding);
+ }
+
+ if (lsda)
+ EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding");
+
+ // Encoding of the FDE pointers
+ EmitEncodingByte(streamer, MOFI->getFDEEncoding(UsingCFI),
+ "FDE Encoding");
+ }
+
+ // Initial Instructions
+
+ const MCAsmInfo &MAI = context.getAsmInfo();
+ const std::vector<MachineMove> &Moves = MAI.getInitialFrameState();
+ std::vector<MCCFIInstruction> Instructions;
+
+ for (int i = 0, n = Moves.size(); i != n; ++i) {
+ MCSymbol *Label = Moves[i].getLabel();
+ const MachineLocation &Dst =
+ TranslateMachineLocation(MRI, Moves[i].getDestination());
+ const MachineLocation &Src =
+ TranslateMachineLocation(MRI, Moves[i].getSource());
+ MCCFIInstruction Inst(Label, Dst, Src);
+ Instructions.push_back(Inst);
+ }
+
+ EmitCFIInstructions(streamer, Instructions, NULL);
+
+ // Padding
+ streamer.EmitValueToAlignment(IsEH
+ ? 4 : context.getAsmInfo().getPointerSize());
+
+ streamer.EmitLabel(sectionEnd);
+ return *sectionStart;
+}
+
+MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
+ const MCSymbol &cieStart,
+ const MCDwarfFrameInfo &frame) {
+ MCContext &context = streamer.getContext();
+ MCSymbol *fdeStart = context.CreateTempSymbol();
+ MCSymbol *fdeEnd = context.CreateTempSymbol();
+ const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
+ bool verboseAsm = streamer.isVerboseAsm();
+
+ if (IsEH && frame.Function && !MOFI->isFunctionEHFrameSymbolPrivate()) {
+ MCSymbol *EHSym =
+ context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh"));
+ streamer.EmitEHSymAttributes(frame.Function, EHSym);
+ streamer.EmitLabel(EHSym);
+ }
+
+ // Length
+ const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0);
+ if (verboseAsm) streamer.AddComment("FDE Length");
+ streamer.EmitAbsValue(Length, 4);
+
+ streamer.EmitLabel(fdeStart);
+
+ // CIE Pointer
+ const MCAsmInfo &asmInfo = context.getAsmInfo();
+ if (IsEH) {
+ const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
+ 0);
+ if (verboseAsm) streamer.AddComment("FDE CIE Offset");
+ streamer.EmitAbsValue(offset, 4);
+ } else if (!asmInfo.doesDwarfRequireRelocationForSectionOffset()) {
+ const MCExpr *offset = MakeStartMinusEndExpr(streamer, *SectionStart,
+ cieStart, 0);
+ streamer.EmitAbsValue(offset, 4);
+ } else {
+ streamer.EmitSymbolValue(&cieStart, 4);
+ }
+
+ unsigned fdeEncoding = MOFI->getFDEEncoding(UsingCFI);
+ unsigned size = getSizeForEncoding(streamer, fdeEncoding);
+
+ // PC Begin
+ unsigned PCBeginEncoding = IsEH ? fdeEncoding :
+ (unsigned)dwarf::DW_EH_PE_absptr;
+ unsigned PCBeginSize = getSizeForEncoding(streamer, PCBeginEncoding);
+ EmitSymbol(streamer, *frame.Begin, PCBeginEncoding, "FDE initial location");
+
+ // PC Range
+ const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin,
+ *frame.End, 0);
+ if (verboseAsm) streamer.AddComment("FDE address range");
+ streamer.EmitAbsValue(Range, size);
+
+ if (IsEH) {
+ // Augmentation Data Length
+ unsigned augmentationLength = 0;
+
+ if (frame.Lsda)
+ augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding);
+
+ if (verboseAsm) streamer.AddComment("Augmentation size");
+ streamer.EmitULEB128IntValue(augmentationLength);
+
+ // Augmentation Data
+ if (frame.Lsda)
+ EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding,
+ "Language Specific Data Area");
+ }
+
+ // Call Frame Instructions
+
+ EmitCFIInstructions(streamer, frame.Instructions, frame.Begin);
+
+ // Padding
+ streamer.EmitValueToAlignment(PCBeginSize);
+
+ return fdeEnd;
+}
+
+namespace {
+ struct CIEKey {
+ static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1); }
+ static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0); }
+
+ CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_,
+ unsigned LsdaEncoding_) : Personality(Personality_),
+ PersonalityEncoding(PersonalityEncoding_),
+ LsdaEncoding(LsdaEncoding_) {
+ }
+ const MCSymbol* Personality;
+ unsigned PersonalityEncoding;
+ unsigned LsdaEncoding;
+ };
+}
+
+namespace llvm {
+ template <>
+ struct DenseMapInfo<CIEKey> {
+ static CIEKey getEmptyKey() {
+ return CIEKey::getEmptyKey();
+ }
+ static CIEKey getTombstoneKey() {
+ return CIEKey::getTombstoneKey();
+ }
+ static unsigned getHashValue(const CIEKey &Key) {
+ FoldingSetNodeID ID;
+ ID.AddPointer(Key.Personality);
+ ID.AddInteger(Key.PersonalityEncoding);
+ ID.AddInteger(Key.LsdaEncoding);
+ return ID.ComputeHash();
+ }
+ static bool isEqual(const CIEKey &LHS,
+ const CIEKey &RHS) {
+ return LHS.Personality == RHS.Personality &&
+ LHS.PersonalityEncoding == RHS.PersonalityEncoding &&
+ LHS.LsdaEncoding == RHS.LsdaEncoding;
+ }
+ };
+}
+
+void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer,
+ bool UsingCFI,
+ bool IsEH) {
+ MCContext &Context = Streamer.getContext();
+ MCObjectFileInfo *MOFI =
+ const_cast<MCObjectFileInfo*>(Context.getObjectFileInfo());
+ FrameEmitterImpl Emitter(UsingCFI, IsEH);
+ ArrayRef<MCDwarfFrameInfo> FrameArray = Streamer.getFrameInfos();
+
+ // Emit the compact unwind info if available.
+ // FIXME: This emits both the compact unwind and the old CIE/FDE
+ // information. Only one of those is needed.
+ if (IsEH && MOFI->getCompactUnwindSection())
+ for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) {
+ const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i);
+ if (!Frame.CompactUnwindEncoding)
+ Emitter.EmitCompactUnwind(Streamer, Frame);
+ }
+
+ const MCSection &Section = IsEH ? *MOFI->getEHFrameSection() :
+ *MOFI->getDwarfFrameSection();
+ Streamer.SwitchSection(&Section);
+ MCSymbol *SectionStart = Context.CreateTempSymbol();
+ Streamer.EmitLabel(SectionStart);
+ Emitter.setSectionStart(SectionStart);
+
+ MCSymbol *FDEEnd = NULL;
+ DenseMap<CIEKey, const MCSymbol*> CIEStarts;
+
+ const MCSymbol *DummyDebugKey = NULL;
+ for (unsigned i = 0, n = FrameArray.size(); i < n; ++i) {
+ const MCDwarfFrameInfo &Frame = FrameArray[i];
+ CIEKey Key(Frame.Personality, Frame.PersonalityEncoding,
+ Frame.LsdaEncoding);
+ const MCSymbol *&CIEStart = IsEH ? CIEStarts[Key] : DummyDebugKey;
+ if (!CIEStart)
+ CIEStart = &Emitter.EmitCIE(Streamer, Frame.Personality,
+ Frame.PersonalityEncoding, Frame.Lsda,
+ Frame.LsdaEncoding);
+
+ FDEEnd = Emitter.EmitFDE(Streamer, *CIEStart, Frame);
+
+ if (i != n - 1)
+ Streamer.EmitLabel(FDEEnd);
+ }
+
+ Streamer.EmitValueToAlignment(Context.getAsmInfo().getPointerSize());
+ if (FDEEnd)
+ Streamer.EmitLabel(FDEEnd);
+}
+
+void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer,
+ uint64_t AddrDelta) {
+ SmallString<256> Tmp;
+ raw_svector_ostream OS(Tmp);
+ MCDwarfFrameEmitter::EncodeAdvanceLoc(AddrDelta, OS);
+ Streamer.EmitBytes(OS.str(), /*AddrSpace=*/0);
+}
+
+void MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta,
+ raw_ostream &OS) {
+ // FIXME: Assumes the code alignment factor is 1.
+ if (AddrDelta == 0) {
+ } else if (isUIntN(6, AddrDelta)) {
+ uint8_t Opcode = dwarf::DW_CFA_advance_loc | AddrDelta;
+ OS << Opcode;
+ } else if (isUInt<8>(AddrDelta)) {
+ OS << uint8_t(dwarf::DW_CFA_advance_loc1);
+ OS << uint8_t(AddrDelta);
+ } else if (isUInt<16>(AddrDelta)) {
+ // FIXME: check what is the correct behavior on a big endian machine.
+ OS << uint8_t(dwarf::DW_CFA_advance_loc2);
+ OS << uint8_t( AddrDelta & 0xff);
+ OS << uint8_t((AddrDelta >> 8) & 0xff);
+ } else {
+ // FIXME: check what is the correct behavior on a big endian machine.
+ assert(isUInt<32>(AddrDelta));
+ OS << uint8_t(dwarf::DW_CFA_advance_loc4);
+ OS << uint8_t( AddrDelta & 0xff);
+ OS << uint8_t((AddrDelta >> 8) & 0xff);
+ OS << uint8_t((AddrDelta >> 16) & 0xff);
+ OS << uint8_t((AddrDelta >> 24) & 0xff);
+
+ }
+}