C++ global_iterator::setSection方法代码示例

void PIC16AsmPrinter::EmitUnInitData (Module &M)
{
  SwitchToSection(TAI->getBSSSection_());
  const TargetData *TD = TM.getTargetData();

  for (Module::global_iterator I = M.global_begin(), E = M.global_end();
       I != E; ++I) {
    if (!I->hasInitializer())   // External global require no code.
      continue;

    Constant *C = I->getInitializer();
    if (C->isNullValue()) {

      if (EmitSpecialLLVMGlobal(I))
        continue;

      // Any variables reaching here with "." in its name is a local scope
      // variable and should not be printed in global data section.
      std::string name = Mang->getValueName(I);
      if (name.find(".") != std::string::npos)
        continue;

      I->setSection(TAI->getBSSSection_()->getName());

      const Type *Ty = C->getType();
      unsigned Size = TD->getTypePaddedSize(Ty);

      O << name << " " <<"RES"<< " " << Size ;
      O << "\n";
    }
  }
}

/// doInitialization - Perfrom Module level initializations here.
/// One task that we do here is to sectionize all global variables.
/// The MemSelOptimizer pass depends on the sectionizing.
///
bool PIC16AsmPrinter::doInitialization(Module &M) {
  bool Result = AsmPrinter::doInitialization(M);

  // FIXME:: This is temporary solution to generate the include file.
  // The processor should be passed to llc as in input and the header file
  // should be generated accordingly.
  O << "\n\t#include P16F1937.INC\n";

  // Set the section names for all globals.
  for (Module::global_iterator I = M.global_begin(), E = M.global_end();
       I != E; ++I)
    if (!I->isDeclaration() && !I->hasAvailableExternallyLinkage()) {
      const MCSection *S = getObjFileLowering().SectionForGlobal(I, Mang, TM);
      
      I->setSection(((const MCSectionPIC16*)S)->getName());
    }

  DbgInfo.BeginModule(M);
  EmitFunctionDecls(M);
  EmitUndefinedVars(M);
  EmitDefinedVars(M);
  EmitIData(M);
  EmitUData(M);
  EmitRomData(M);
  return Result;
}

bool PIC16AsmPrinter::doInitialization (Module &M) {
  bool Result = AsmPrinter::doInitialization(M);
  DbgInfo.EmitFileDirective(M);

  // FIXME:: This is temporary solution to generate the include file.
  // The processor should be passed to llc as in input and the header file
  // should be generated accordingly.
  O << "\n\t#include P16F1937.INC\n";
  MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
  assert(MMI);
  DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
  assert(DW && "Dwarf Writer is not available");
  DW->BeginModule(&M, MMI, O, this, TAI);

  // Set the section names for all globals.
  for (Module::global_iterator I = M.global_begin(), E = M.global_end();
       I != E; ++I) {
    I->setSection(TAI->SectionForGlobal(I)->getName());
  }

  EmitFunctionDecls(M);
  EmitUndefinedVars(M);
  EmitDefinedVars(M);
  EmitIData(M);
  EmitUData(M);
  EmitRomData(M);
  DbgInfo.PopulateFunctsDI(M); 
  return Result;
}

/// doInitialization - Perform Module level initializations here.
/// One task that we do here is to sectionize all global variables.
/// The MemSelOptimizer pass depends on the sectionizing.
///
bool PIC16AsmPrinter::doInitialization(Module &M) {
  bool Result = AsmPrinter::doInitialization(M);

  // Every asmbly contains these std headers. 
  O << "\n#include p16f1xxx.inc";
  O << "\n#include stdmacros.inc";

  // Set the section names for all globals.
  for (Module::global_iterator I = M.global_begin(), E = M.global_end();
       I != E; ++I) {

    // Record External Var Decls.
    if (I->isDeclaration()) {
      ExternalVarDecls.push_back(I);
      continue;
    }

    // Record Exteranl Var Defs.
    if (I->hasExternalLinkage() || I->hasCommonLinkage()) {
      ExternalVarDefs.push_back(I);
    }

    // Sectionify actual data.
    if (!I->hasAvailableExternallyLinkage()) {
      const MCSection *S = getObjFileLowering().SectionForGlobal(I, Mang, TM);
      
      I->setSection(((const PIC16Section *)S)->getName());
    }
  }

  DbgInfo.BeginModule(M);
  EmitFunctionDecls(M);
  EmitUndefinedVars(M);
  EmitDefinedVars(M);
  EmitIData(M);
  EmitUData(M);
  EmitRomData(M);
  EmitSharedUdata(M);
  EmitUserSections(M);
  return Result;
}