diff options
Diffstat (limited to 'lib/MC/MCDwarf.cpp')
| -rw-r--r-- | lib/MC/MCDwarf.cpp | 148 |
1 files changed, 126 insertions, 22 deletions
diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp index d232d84..13164ed 100644 --- a/lib/MC/MCDwarf.cpp +++ b/lib/MC/MCDwarf.cpp @@ -30,23 +30,23 @@ 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. @@ -290,7 +290,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS) { const std::vector<const MCSection *> &MCLineSectionOrder = MCOS->getContext().getMCLineSectionOrder(); for (std::vector<const MCSection*>::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); @@ -460,13 +460,14 @@ static unsigned getSizeForEncoding(MCStreamer &streamer, } static void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol, - unsigned symbolEncoding) { + 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); } @@ -526,11 +527,46 @@ namespace { 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: @@ -542,9 +578,13 @@ void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer, // 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()); } @@ -553,47 +593,62 @@ void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer, 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; } @@ -616,6 +671,7 @@ void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer, if (BaseLabel && Label) { MCSymbol *ThisSym = Label; if (ThisSym != BaseLabel) { + if (streamer.isVerboseAsm()) streamer.AddComment("DW_CFA_advance_loc4"); streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym); BaseLabel = ThisSym; } @@ -635,10 +691,7 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer, #else MCContext &Context = Streamer.getContext(); const TargetAsmInfo &TAI = Context.getTargetAsmInfo(); - Streamer.SwitchSection(TAI.getCompactUnwindSection()); - - unsigned FDEEncoding = TAI.getFDEEncoding(UsingCFI); - unsigned Size = getSizeForEncoding(Streamer, FDEEncoding); + bool VerboseAsm = Streamer.isVerboseAsm(); // range-start range-length compact-unwind-enc personality-func lsda // _foo LfooEnd-_foo 0x00000023 0 0 @@ -662,13 +715,43 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer, // .quad __gxx_personality // .quad except_tab1 + Streamer.SwitchSection(TAI.getCompactUnwindSection()); + // Range Start - EmitSymbol(Streamer, *Frame.Begin, FDEEncoding); + 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); - Streamer.EmitAbsValue(Range, Size); + if (VerboseAsm) Streamer.AddComment("Range Length"); + Streamer.EmitAbsValue(Range, 4); + + // FIXME: + // Compact Encoding + const std::vector<MachineMove> &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 @@ -681,6 +764,7 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, unsigned lsdaEncoding) { MCContext &context = streamer.getContext(); const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); + bool verboseAsm = streamer.isVerboseAsm(); MCSymbol *sectionStart; if (asmInfo.isFunctionEHFrameSymbolPrivate() || !IsEH) @@ -688,6 +772,7 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, else sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum)); + streamer.EmitLabel(sectionStart); CIENum++; MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol(); @@ -695,19 +780,22 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, // Length const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart, *sectionEnd, 4); - streamer.EmitLabel(sectionStart); + 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"; @@ -719,12 +807,15 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, 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) @@ -742,19 +833,25 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, // Encoding of the FDE pointers augmentationLength += 1; + if (verboseAsm) streamer.AddComment("Augmentation Size"); streamer.EmitULEB128IntValue(augmentationLength); // Augmentation Data (optional) if (personality) { // Personality Encoding - streamer.EmitIntValue(personalityEncoding, 1); + EmitEncodingByte(streamer, personalityEncoding, + "Personality Encoding"); // Personality + if (verboseAsm) streamer.AddComment("Personality"); EmitPersonality(streamer, *personality, personalityEncoding); } + if (lsda) - streamer.EmitIntValue(lsdaEncoding, 1); // LSDA Encoding + EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding"); + // Encoding of the FDE pointers - streamer.EmitIntValue(asmInfo.getFDEEncoding(UsingCFI), 1); + EmitEncodingByte(streamer, asmInfo.getFDEEncoding(UsingCFI), + "FDE Encoding"); } // Initial Instructions @@ -788,16 +885,18 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer, 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")); + 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); @@ -807,6 +906,7 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer, 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, @@ -815,6 +915,7 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer, } else { streamer.EmitSymbolValue(&cieStart, 4); } + unsigned fdeEncoding = TAsmInfo.getFDEEncoding(UsingCFI); unsigned size = getSizeForEncoding(streamer, fdeEncoding); @@ -822,11 +923,12 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer, unsigned PCBeginEncoding = IsEH ? fdeEncoding : (unsigned)dwarf::DW_EH_PE_absptr; unsigned PCBeginSize = getSizeForEncoding(streamer, PCBeginEncoding); - EmitSymbol(streamer, *frame.Begin, 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) { @@ -836,11 +938,13 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer, 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); + EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding, + "Language Specific Data Area"); } // Call Frame Instructions |