X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCDwarf.cpp;h=13164edf519f29cceeea8c49c7aa8a126b9e40bd;hb=c3882164cbf794dbe21816a2946a31bc9e02a419;hp=96ba69aaea2c02a8b37ecd47989e401a60a96a4b;hpb=849ecb1431f878aeef2be8d08679a740e603e95a;p=oota-llvm.git diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp index 96ba69aaea2..13164edf519 100644 --- a/lib/MC/MCDwarf.cpp +++ b/lib/MC/MCDwarf.cpp @@ -17,7 +17,9 @@ #include "llvm/MC/MCContext.h" #include "llvm/MC/MCObjectWriter.h" #include "llvm/ADT/SmallString.h" +#include "llvm/ADT/Twine.h" #include "llvm/Support/Debug.h" +#include "llvm/Support/ErrorHandling.h" #include "llvm/Support/raw_ostream.h" #include "llvm/Target/TargetAsmBackend.h" #include "llvm/Target/TargetAsmInfo.h" @@ -28,28 +30,27 @@ using namespace llvm; #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) // The maximum address skip amount that can be encoded with a special op. -#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) +#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) // First special line opcode - leave room for the standard opcodes. // Note: If you want to change this, you'll have to update the // "standard_opcode_lengths" table that is emitted in DwarfFileTable::Emit(). -#define DWARF2_LINE_OPCODE_BASE 13 +#define DWARF2_LINE_OPCODE_BASE 13 // Minimum line offset in a special line info. opcode. This value // was chosen to give a reasonable range of values. -#define DWARF2_LINE_BASE -5 +#define DWARF2_LINE_BASE -5 // Range of line offsets in a special line info. opcode. -# define DWARF2_LINE_RANGE 14 +#define DWARF2_LINE_RANGE 14 // Define the architecture-dependent minimum instruction length (in bytes). // This value should be rather too small than too big. -# define DWARF2_LINE_MIN_INSN_LENGTH 1 +#define DWARF2_LINE_MIN_INSN_LENGTH 1 // Note: when DWARF2_LINE_MIN_INSN_LENGTH == 1 which is the current setting, // this routine is a nop and will be optimized away. -static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta) -{ +static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta) { if (DWARF2_LINE_MIN_INSN_LENGTH == 1) return AddrDelta; if (AddrDelta % DWARF2_LINE_MIN_INSN_LENGTH != 0) { @@ -289,7 +290,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS) { const std::vector &MCLineSectionOrder = MCOS->getContext().getMCLineSectionOrder(); for (std::vector::const_iterator it = - MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie; + MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie; ++it) { const MCSection *Sec = *it; const MCLineSection *Line = MCLineSections.lookup(Sec); @@ -352,10 +353,7 @@ void MCDwarfLineAddr::Encode(int64_t LineDelta, uint64_t AddrDelta, OS << char(dwarf::DW_LNS_const_add_pc); else { OS << char(dwarf::DW_LNS_advance_pc); - SmallString<32> Tmp; - raw_svector_ostream OSE(Tmp); - MCObjectWriter::EncodeULEB128(AddrDelta, OSE); - OS << OSE.str(); + MCObjectWriter::EncodeULEB128(AddrDelta, OS); } OS << char(dwarf::DW_LNS_extended_op); OS << char(1); @@ -432,275 +430,557 @@ static int getDataAlignmentFactor(MCStreamer &streamer) { MCContext &context = streamer.getContext(); const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); int size = asmInfo.getPointerSize(); - if (asmInfo.getStackGrowthDirection() == TargetFrameInfo::StackGrowsUp) + if (asmInfo.getStackGrowthDirection() == TargetFrameLowering::StackGrowsUp) return size; else return -size; } -/// EmitFrameMoves - Emit frame instructions to describe the layout of the -/// frame. -static void EmitFrameMoves(MCStreamer &streamer, - const std::vector &Moves, - MCSymbol *BaseLabel, bool isEH) { +static unsigned getSizeForEncoding(MCStreamer &streamer, + unsigned symbolEncoding) { MCContext &context = streamer.getContext(); const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); - int dataAlignmentFactor = getDataAlignmentFactor(streamer); + unsigned format = symbolEncoding & 0x0f; + switch (format) { + default: + assert(0 && "Unknown Encoding"); + case dwarf::DW_EH_PE_absptr: + case dwarf::DW_EH_PE_signed: + return asmInfo.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; + } +} - for (unsigned i = 0, N = Moves.size(); i < N; ++i) { - const MachineMove &Move = Moves[i]; - MCSymbol *Label = Move.getLabel(); - // Throw out move if the label is invalid. - if (Label && !Label->isDefined()) continue; // Not emitted, in dead code. +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); +} - const MachineLocation &Dst = Move.getDestination(); - const MachineLocation &Src = Move.getSource(); +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); +} - // Advance row if new location. - if (BaseLabel && Label) { - MCSymbol *ThisSym = Label; - if (ThisSym != BaseLabel) { - streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym); - BaseLabel = ThisSym; - } +static const MachineLocation TranslateMachineLocation( + const TargetAsmInfo &AsmInfo, + const MachineLocation &Loc) { + unsigned Reg = Loc.getReg() == MachineLocation::VirtualFP ? + MachineLocation::VirtualFP : + unsigned(AsmInfo.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, const MCSymbol *sectionStart) : + CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH), + SectionStart(sectionStart) { } + /// 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 &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 = ""; + 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) { - assert(!Src.isReg() && "Machine move not supported yet."); - if (Src.getReg() == MachineLocation::VirtualFP) { - streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1); + if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_offset"); + Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1); } else { - streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1); - streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Src.getReg(), - isEH)); + 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()); } - streamer.EmitULEB128IntValue(-Src.getOffset(), 1); - continue; + 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."); - streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1); - streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Dst.getReg(), isEH)); - continue; + 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 = asmInfo.getDwarfRegNum(Src.getReg(), isEH); - int Offset = Dst.getOffset() / dataAlignmentFactor; + unsigned Reg = Src.getReg(); + int Offset = Dst.getOffset(); + if (IsRelative) + Offset -= CFAOffset; + Offset = Offset / dataAlignmentFactor; if (Offset < 0) { - streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1); - streamer.EmitULEB128IntValue(Reg); - streamer.EmitSLEB128IntValue(Offset); + 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) { - streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1); - streamer.EmitULEB128IntValue(Offset, 1); + 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 { - streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1); - streamer.EmitULEB128IntValue(Reg, 1); - streamer.EmitULEB128IntValue(Offset, 1); + 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"); } -static void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol, - unsigned symbolEncoding) { - MCContext &context = streamer.getContext(); - const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); - unsigned format = symbolEncoding & 0x0f; - unsigned application = symbolEncoding & 0xf0; - unsigned size; - switch (format) { - default: - assert(0 && "Unknown Encoding"); - case dwarf::DW_EH_PE_absptr: - case dwarf::DW_EH_PE_signed: - size = asmInfo.getPointerSize(); - break; - case dwarf::DW_EH_PE_udata2: - case dwarf::DW_EH_PE_sdata2: - size = 2; - break; - case dwarf::DW_EH_PE_udata4: - case dwarf::DW_EH_PE_sdata4: - size = 4; - break; - case dwarf::DW_EH_PE_udata8: - case dwarf::DW_EH_PE_sdata8: - size = 8; - break; - } - switch (application) { - default: - assert(0 && "Unknown Encoding"); - break; - case 0: - case dwarf::DW_EH_PE_indirect: - streamer.EmitSymbolValue(&symbol, size); - break; - case dwarf::DW_EH_PE_pcrel: - streamer.EmitPCRelSymbolValue(&symbol, size); - break; +/// EmitFrameMoves - Emit frame instructions to describe the layout of the +/// frame. +void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer, + const std::vector &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); } } -static const MCSymbol &EmitCIE(MCStreamer &streamer, - const MCSymbol *personality, - unsigned personalityEncoding, - const MCSymbol *lsda, - unsigned lsdaEncoding) { +/// 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) { +#if 1 + return false; +#else + MCContext &Context = Streamer.getContext(); + const TargetAsmInfo &TAI = Context.getTargetAsmInfo(); + 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 + + Streamer.SwitchSection(TAI.getCompactUnwindSection()); + + // Range Start + unsigned FDEEncoding = TAI.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); + + // FIXME: + // Compact Encoding + const std::vector &Moves = TAI.getInitialFrameState(); + uint32_t Encoding = 0; + Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_udata4); + if (VerboseAsm) Streamer.AddComment("Compact Unwind Encoding"); + Streamer.EmitIntValue(Encoding, Size); + + // Personality Function + Size = getSizeForEncoding(Streamer, Frame.PersonalityEncoding); + 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; +#endif +} + +const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, + const MCSymbol *personality, + unsigned personalityEncoding, + const MCSymbol *lsda, + unsigned lsdaEncoding) { MCContext &context = streamer.getContext(); const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); - const MCSection §ion = *asmInfo.getEHFrameSection(); - streamer.SwitchSection(§ion); - MCSymbol *sectionStart = streamer.getContext().CreateTempSymbol(); + bool verboseAsm = streamer.isVerboseAsm(); + + MCSymbol *sectionStart; + if (asmInfo.isFunctionEHFrameSymbolPrivate() || !IsEH) + sectionStart = context.CreateTempSymbol(); + else + sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum)); + + streamer.EmitLabel(sectionStart); + CIENum++; + MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol(); // Length const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart, *sectionEnd, 4); - streamer.EmitLabel(sectionStart); - streamer.EmitValue(Length, 4); + if (verboseAsm) streamer.AddComment("CIE Length"); + streamer.EmitAbsValue(Length, 4); // CIE ID - streamer.EmitIntValue(0, 4); + 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; - Augmentation += "z"; - if (personality) - Augmentation += "P"; - if (lsda) - Augmentation += "L"; - Augmentation += "R"; - streamer.EmitBytes(Augmentation.str(), 0); + 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(asmInfo.getDwarfRARegNum(true)); // Augmentation Data Length (optional) - MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol(); - MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol(); - const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer, - *augmentationStart, - *augmentationEnd, 0); - streamer.EmitULEB128Value(augmentationLength); - - // Augmentation Data (optional) - streamer.EmitLabel(augmentationStart); - if (personality) { - // Personality Encoding - streamer.EmitIntValue(personalityEncoding, 1); - // Personality - EmitSymbol(streamer, *personality, personalityEncoding); - } - if (lsda) { - // LSDA Encoding - streamer.EmitIntValue(lsdaEncoding, 1); + + 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, asmInfo.getFDEEncoding(UsingCFI), + "FDE Encoding"); } - // Encoding of the FDE pointers - streamer.EmitIntValue(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4, 1); - streamer.EmitLabel(augmentationEnd); // Initial Instructions - const std::vector Moves = asmInfo.getInitialFrameState(); + const std::vector &Moves = asmInfo.getInitialFrameState(); + std::vector Instructions; + + for (int i = 0, n = Moves.size(); i != n; ++i) { + MCSymbol *Label = Moves[i].getLabel(); + const MachineLocation &Dst = + TranslateMachineLocation(asmInfo, Moves[i].getDestination()); + const MachineLocation &Src = + TranslateMachineLocation(asmInfo, Moves[i].getSource()); + MCCFIInstruction Inst(Label, Dst, Src); + Instructions.push_back(Inst); + } - EmitFrameMoves(streamer, Moves, NULL, true); + EmitCFIInstructions(streamer, Instructions, NULL); // Padding - streamer.EmitValueToAlignment(4); + streamer.EmitValueToAlignment(IsEH ? 4 : asmInfo.getPointerSize()); streamer.EmitLabel(sectionEnd); return *sectionStart; } -static MCSymbol *EmitFDE(MCStreamer &streamer, - const MCSymbol &cieStart, - const MCDwarfFrameInfo &frame) { +MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer, + const MCSymbol &cieStart, + const MCDwarfFrameInfo &frame) { MCContext &context = streamer.getContext(); MCSymbol *fdeStart = context.CreateTempSymbol(); MCSymbol *fdeEnd = context.CreateTempSymbol(); + const TargetAsmInfo &TAsmInfo = context.getTargetAsmInfo(); + bool verboseAsm = streamer.isVerboseAsm(); + + if (!TAsmInfo.isFunctionEHFrameSymbolPrivate() && IsEH) { + 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); - streamer.EmitValue(Length, 4); + if (verboseAsm) streamer.AddComment("FDE Length"); + streamer.EmitAbsValue(Length, 4); streamer.EmitLabel(fdeStart); + // CIE Pointer - const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart, - 0); - streamer.EmitValue(offset, 4); + 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 = TAsmInfo.getFDEEncoding(UsingCFI); + unsigned size = getSizeForEncoding(streamer, fdeEncoding); // PC Begin - streamer.EmitPCRelSymbolValue(frame.Begin, 4); + 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); - streamer.EmitValue(Range, 4); - - // Augmentation Data Length - MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol(); - MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol(); - const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer, - *augmentationStart, - *augmentationEnd, 0); - streamer.EmitULEB128Value(augmentationLength); - - // Augmentation Data - streamer.EmitLabel(augmentationStart); - if (frame.Lsda) - EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding); - streamer.EmitLabel(augmentationEnd); + 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 - EmitFrameMoves(streamer, frame.Moves, frame.Begin, true); + EmitCFIInstructions(streamer, frame.Instructions, frame.Begin); // Padding - streamer.EmitValueToAlignment(4); + streamer.EmitValueToAlignment(PCBeginSize); return fdeEnd; } -struct CIEKey { - static const CIEKey EmptyKey; - static const CIEKey TombstoneKey; - - CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_, - unsigned LsdaEncoding_) : Personality(Personality_), - PersonalityEncoding(PersonalityEncoding_), - LsdaEncoding(LsdaEncoding_) { - } - const MCSymbol* Personality; - unsigned PersonalityEncoding; - unsigned LsdaEncoding; -}; +namespace { + struct CIEKey { + static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1); } + static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0); } -const CIEKey CIEKey::EmptyKey(0, 0, -1); -const CIEKey CIEKey::TombstoneKey(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 { static CIEKey getEmptyKey() { - return CIEKey::EmptyKey; + return CIEKey::getEmptyKey(); } static CIEKey getTombstoneKey() { - return CIEKey::TombstoneKey; + return CIEKey::getTombstoneKey(); } static unsigned getHashValue(const CIEKey &Key) { FoldingSetNodeID ID; @@ -718,29 +998,45 @@ namespace llvm { }; } -void MCDwarfFrameEmitter::Emit(MCStreamer &streamer) { - const MCContext &context = streamer.getContext(); - const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); - MCSymbol *fdeEnd = NULL; +void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer, + bool UsingCFI, + bool IsEH) { + MCContext &Context = Streamer.getContext(); + const TargetAsmInfo &AsmInfo = Context.getTargetAsmInfo(); + const MCSection &Section = IsEH ? *AsmInfo.getEHFrameSection() : + *AsmInfo.getDwarfFrameSection(); + Streamer.SwitchSection(&Section); + MCSymbol *SectionStart = Context.CreateTempSymbol(); + Streamer.EmitLabel(SectionStart); + + MCSymbol *FDEEnd = NULL; DenseMap CIEStarts; + FrameEmitterImpl Emitter(UsingCFI, IsEH, SectionStart); + + const MCSymbol *DummyDebugKey = NULL; + for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) { + const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i); + if (IsEH && AsmInfo.getCompactUnwindSection() && + Emitter.EmitCompactUnwind(Streamer, Frame)) + continue; + + 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); - for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i) { - const MCDwarfFrameInfo &frame = streamer.getFrameInfo(i); - CIEKey key(frame.Personality, frame.PersonalityEncoding, - frame.LsdaEncoding); - const MCSymbol *&cieStart = CIEStarts[key]; - if (!cieStart) - cieStart = &EmitCIE(streamer, frame.Personality, - frame.PersonalityEncoding, frame.Lsda, - frame.LsdaEncoding); - fdeEnd = EmitFDE(streamer, *cieStart, frame); if (i != n - 1) - streamer.EmitLabel(fdeEnd); + Streamer.EmitLabel(FDEEnd); } - streamer.EmitValueToAlignment(asmInfo.getPointerSize()); - if (fdeEnd) - streamer.EmitLabel(fdeEnd); + Streamer.EmitValueToAlignment(AsmInfo.getPointerSize()); + if (FDEEnd) + Streamer.EmitLabel(FDEEnd); } void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer, @@ -754,18 +1050,26 @@ void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer, void MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta, raw_ostream &OS) { // FIXME: Assumes the code alignment factor is 1. - if (isUIntN(6, AddrDelta)) { + 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 << uint16_t(AddrDelta); + 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 << uint32_t(AddrDelta); + OS << uint8_t( AddrDelta & 0xff); + OS << uint8_t((AddrDelta >> 8) & 0xff); + OS << uint8_t((AddrDelta >> 16) & 0xff); + OS << uint8_t((AddrDelta >> 24) & 0xff); + } }