C++ MipsSubtarget::useOddSPReg方法代码示例

void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) {
  MipsTargetStreamer &TS = getTargetStreamer();

  // MipsTargetStreamer has an initialization order problem when emitting an
  // object file directly (see MipsTargetELFStreamer for full details). Work
  // around it by re-initializing the PIC state here.
  TS.setPic(OutContext.getObjectFileInfo()->isPositionIndependent());

  // Compute MIPS architecture attributes based on the default subtarget
  // that we'd have constructed. Module level directives aren't LTO
  // clean anyhow.
  // FIXME: For ifunc related functions we could iterate over and look
  // for a feature string that doesn't match the default one.
  const Triple &TT = TM.getTargetTriple();
  StringRef CPU = MIPS_MC::selectMipsCPU(TT, TM.getTargetCPU());
  StringRef FS = TM.getTargetFeatureString();
  const MipsTargetMachine &MTM = static_cast<const MipsTargetMachine &>(TM);
  const MipsSubtarget STI(TT, CPU, FS, MTM.isLittleEndian(), MTM);

  bool IsABICalls = STI.isABICalls();
  const MipsABIInfo &ABI = MTM.getABI();
  if (IsABICalls) {
    TS.emitDirectiveAbiCalls();
    Reloc::Model RM = TM.getRelocationModel();
    // FIXME: This condition should be a lot more complicated that it is here.
    //        Ideally it should test for properties of the ABI and not the ABI
    //        itself.
    //        For the moment, I'm only correcting enough to make MIPS-IV work.
    if (RM == Reloc::Static && !ABI.IsN64())
      TS.emitDirectiveOptionPic0();
  }

  // Tell the assembler which ABI we are using
  std::string SectionName = std::string(".mdebug.") + getCurrentABIString();
  OutStreamer->SwitchSection(
      OutContext.getELFSection(SectionName, ELF::SHT_PROGBITS, 0));

  // NaN: At the moment we only support:
  // 1. .nan legacy (default)
  // 2. .nan 2008
  STI.isNaN2008() ? TS.emitDirectiveNaN2008()
                  : TS.emitDirectiveNaNLegacy();

  // TODO: handle O64 ABI

  TS.updateABIInfo(STI);

  // We should always emit a '.module fp=...' but binutils 2.24 does not accept
  // it. We therefore emit it when it contradicts the ABI defaults (-mfpxx or
  // -mfp64) and omit it otherwise.
  if (ABI.IsO32() && (STI.isABI_FPXX() || STI.isFP64bit()))
    TS.emitDirectiveModuleFP();

  // We should always emit a '.module [no]oddspreg' but binutils 2.24 does not
  // accept it. We therefore emit it when it contradicts the default or an
  // option has changed the default (i.e. FPXX) and omit it otherwise.
  if (ABI.IsO32() && (!STI.useOddSPReg() || STI.isABI_FPXX()))
    TS.emitDirectiveModuleOddSPReg();
}

void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) {

  // Compute MIPS architecture attributes based on the default subtarget
  // that we'd have constructed. Module level directives aren't LTO
  // clean anyhow.
  // FIXME: For ifunc related functions we could iterate over and look
  // for a feature string that doesn't match the default one.
  StringRef TT = TM.getTargetTriple();
  StringRef CPU =
      MIPS_MC::selectMipsCPU(TM.getTargetTriple(), TM.getTargetCPU());
  StringRef FS = TM.getTargetFeatureString();
  const MipsTargetMachine &MTM = static_cast<const MipsTargetMachine &>(TM);
  const MipsSubtarget STI(TT, CPU, FS, MTM.isLittleEndian(), MTM);

  bool IsABICalls = STI.isABICalls();
  const MipsABIInfo &ABI = MTM.getABI();
  if (IsABICalls) {
    getTargetStreamer().emitDirectiveAbiCalls();
    Reloc::Model RM = TM.getRelocationModel();
    // FIXME: This condition should be a lot more complicated that it is here.
    //        Ideally it should test for properties of the ABI and not the ABI
    //        itself.
    //        For the moment, I'm only correcting enough to make MIPS-IV work.
    if (RM == Reloc::Static && !ABI.IsN64())
      getTargetStreamer().emitDirectiveOptionPic0();
  }

  // Tell the assembler which ABI we are using
  std::string SectionName = std::string(".mdebug.") + getCurrentABIString();
  OutStreamer.SwitchSection(
      OutContext.getELFSection(SectionName, ELF::SHT_PROGBITS, 0));

  // NaN: At the moment we only support:
  // 1. .nan legacy (default)
  // 2. .nan 2008
  STI.isNaN2008() ? getTargetStreamer().emitDirectiveNaN2008()
                  : getTargetStreamer().emitDirectiveNaNLegacy();

  // TODO: handle O64 ABI

  if (ABI.IsEABI()) {
    if (STI.isGP32bit())
      OutStreamer.SwitchSection(OutContext.getELFSection(".gcc_compiled_long32",
                                                         ELF::SHT_PROGBITS, 0));
    else
      OutStreamer.SwitchSection(OutContext.getELFSection(".gcc_compiled_long64",
                                                         ELF::SHT_PROGBITS, 0));
  }

  getTargetStreamer().updateABIInfo(STI);

  // We should always emit a '.module fp=...' but binutils 2.24 does not accept
  // it. We therefore emit it when it contradicts the ABI defaults (-mfpxx or
  // -mfp64) and omit it otherwise.
  if (ABI.IsO32() && (STI.isABI_FPXX() || STI.isFP64bit()))
    getTargetStreamer().emitDirectiveModuleFP();

  // We should always emit a '.module [no]oddspreg' but binutils 2.24 does not
  // accept it. We therefore emit it when it contradicts the default or an
  // option has changed the default (i.e. FPXX) and omit it otherwise.
  if (ABI.IsO32() && (!STI.useOddSPReg() || STI.isABI_FPXX()))
    getTargetStreamer().emitDirectiveModuleOddSPReg(STI.useOddSPReg(),
                                                    ABI.IsO32());

  // @LOCALMOD-START
  if (STI.isTargetNaCl()) {
    initializeNaClMCStreamer(OutStreamer, OutContext, Triple(TT));
  }
  // @LOCALMOD-END
}