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https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-12 17:32:19 +00:00
Add comments to the ASM output to help understand the compact unwind and CIE tables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134191 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
parent
cfe5254cd3
commit
3c163cfa60
@ -526,6 +526,40 @@ namespace {
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void EmitCFIInstruction(MCStreamer &Streamer,
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const MCCFIInstruction &Instr);
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};
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} // end anonymous namespace
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static void EmitEncodingByte(MCStreamer &Streamer, unsigned Encoding,
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StringRef Prefix) {
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if (Streamer.isVerboseAsm()) {
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const char *EncStr = 0;
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switch (Encoding) {
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default: EncStr = "<unknown encoding>";
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case dwarf::DW_EH_PE_absptr: EncStr = "absptr";
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case dwarf::DW_EH_PE_omit: EncStr = "omit";
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case dwarf::DW_EH_PE_pcrel: EncStr = "pcrel";
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case dwarf::DW_EH_PE_udata4: EncStr = "udata4";
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case dwarf::DW_EH_PE_udata8: EncStr = "udata8";
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case dwarf::DW_EH_PE_sdata4: EncStr = "sdata4";
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case dwarf::DW_EH_PE_sdata8: EncStr = "sdata8";
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case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4: EncStr = "pcrel udata4";
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case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4: EncStr = "pcrel sdata4";
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case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8: EncStr = "pcrel udata8";
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case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8: EncStr = "pcrel sdata8";
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case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata4:
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EncStr = "indirect pcrel udata4";
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case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata4:
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EncStr = "indirect pcrel sdata4";
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case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata8:
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EncStr = "indirect pcrel udata8";
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case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata8:
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EncStr = "indirect pcrel sdata8";
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}
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Streamer.AddComment(Twine(Prefix) + " = " + EncStr);
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}
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Streamer.EmitIntValue(Encoding, 1);
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}
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void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
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@ -635,7 +669,7 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
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#else
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MCContext &Context = Streamer.getContext();
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const TargetAsmInfo &TAI = Context.getTargetAsmInfo();
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Streamer.SwitchSection(TAI.getCompactUnwindSection());
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bool VerboseAsm = Streamer.isVerboseAsm();
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// range-start range-length compact-unwind-enc personality-func lsda
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// _foo LfooEnd-_foo 0x00000023 0 0
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@ -659,25 +693,31 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
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// .quad __gxx_personality
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// .quad except_tab1
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Streamer.SwitchSection(TAI.getCompactUnwindSection());
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// Range Start
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unsigned FDEEncoding = TAI.getFDEEncoding(UsingCFI);
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unsigned Size = getSizeForEncoding(Streamer, FDEEncoding);
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if (VerboseAsm) Streamer.AddComment("Range Start");
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Streamer.EmitSymbolValue(Frame.Function, Size);
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// Range Length
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const MCExpr *Range = MakeStartMinusEndExpr(Streamer, *Frame.Begin,
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*Frame.End, 0);
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if (VerboseAsm) Streamer.AddComment("Range Length");
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Streamer.EmitAbsValue(Range, 4);
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// FIXME:
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// Compact Encoding
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const std::vector<MachineMove> &Moves = TAI.getInitialFrameState();
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uint32_t Encoding = 0;
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Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_udata4);
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if (VerboseAsm) Streamer.AddComment("Compact Unwind Encoding");
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Streamer.EmitIntValue(Encoding, Size);
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// Personality Function
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Size = getSizeForEncoding(Streamer, Frame.PersonalityEncoding);
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if (VerboseAsm) Streamer.AddComment("Personality Function");
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if (Frame.Personality)
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Streamer.EmitSymbolValue(Frame.Personality, Size);
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else
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@ -685,6 +725,7 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
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// LSDA
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Size = getSizeForEncoding(Streamer, Frame.LsdaEncoding);
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if (VerboseAsm) Streamer.AddComment("LSDA");
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if (Frame.Lsda)
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Streamer.EmitSymbolValue(Frame.Lsda, Size);
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else
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@ -701,6 +742,7 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
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unsigned lsdaEncoding) {
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MCContext &context = streamer.getContext();
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const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
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bool verboseAsm = streamer.isVerboseAsm();
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MCSymbol *sectionStart;
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if (asmInfo.isFunctionEHFrameSymbolPrivate() || !IsEH)
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@ -708,6 +750,7 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
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else
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sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum));
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streamer.EmitLabel(sectionStart);
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CIENum++;
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MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol();
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@ -715,19 +758,22 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
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// Length
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const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart,
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*sectionEnd, 4);
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streamer.EmitLabel(sectionStart);
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if (verboseAsm) streamer.AddComment("CIE Length");
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streamer.EmitAbsValue(Length, 4);
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// CIE ID
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unsigned CIE_ID = IsEH ? 0 : -1;
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if (verboseAsm) streamer.AddComment("CIE ID Tag");
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streamer.EmitIntValue(CIE_ID, 4);
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// Version
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if (verboseAsm) streamer.AddComment("DW_CIE_VERSION");
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streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1);
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// Augmentation String
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SmallString<8> Augmentation;
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if (IsEH) {
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if (verboseAsm) streamer.AddComment("CIE Augmentation");
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Augmentation += "z";
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if (personality)
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Augmentation += "P";
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@ -739,12 +785,15 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
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streamer.EmitIntValue(0, 1);
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// Code Alignment Factor
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if (verboseAsm) streamer.AddComment("CIE Code Alignment Factor");
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streamer.EmitULEB128IntValue(1);
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// Data Alignment Factor
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if (verboseAsm) streamer.AddComment("CIE Data Alignment Factor");
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streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer));
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// Return Address Register
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if (verboseAsm) streamer.AddComment("CIE Return Address Column");
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streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true));
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// Augmentation Data Length (optional)
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@ -762,19 +811,25 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
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// Encoding of the FDE pointers
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augmentationLength += 1;
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if (verboseAsm) streamer.AddComment("Augmentation Size");
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streamer.EmitULEB128IntValue(augmentationLength);
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// Augmentation Data (optional)
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if (personality) {
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// Personality Encoding
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streamer.EmitIntValue(personalityEncoding, 1);
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EmitEncodingByte(streamer, personalityEncoding,
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"Personality Encoding");
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// Personality
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if (verboseAsm) streamer.AddComment("Personality");
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EmitPersonality(streamer, *personality, personalityEncoding);
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}
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if (lsda)
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streamer.EmitIntValue(lsdaEncoding, 1); // LSDA Encoding
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EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding");
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// Encoding of the FDE pointers
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streamer.EmitIntValue(asmInfo.getFDEEncoding(UsingCFI), 1);
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EmitEncodingByte(streamer, asmInfo.getFDEEncoding(UsingCFI),
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"FDE Encoding");
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}
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// Initial Instructions
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