C++ QualType::isPODType方法代码示例

UninitializedFieldRule::StringRefSet UninitializedFieldRule::GetCandidateFieldsList(const RecordDecl* recordDeclaration,
                                                                                    ASTContext* context)
{
    StringRefSet candidates;

    for (const FieldDecl* fieldDeclaration : recordDeclaration->fields())
    {
        if (fieldDeclaration->hasInClassInitializer())
            continue;

        QualType type = fieldDeclaration->getType();
        if (! type.isPODType(*context))
            continue;

        if (IsRecordTypeWithoutDataMembers(type))
            continue;

        if (fieldDeclaration->isAnonymousStructOrUnion())
            continue;

        candidates.insert(fieldDeclaration->getName());
    }

    return candidates;
}

unsigned clang_isPODType(CXType X) {
  QualType T = GetQualType(X);
  if (!T.getTypePtrOrNull())
    return 0;
  
  CXTranslationUnit TU = GetTU(X);
  ASTUnit *AU = static_cast<ASTUnit*>(TU->TUData);

  return T.isPODType(AU->getASTContext()) ? 1 : 0;
}

bool IsUninitializedPodVariable(const VarDecl* variableDeclaration, ASTContext* context)
{
    QualType type = variableDeclaration->getType();
    if (! type.isPODType(*context))
        return false;

    if (IsRecordTypeWithoutDataMembers(type))
        return false;

    return (!variableDeclaration->hasInit()) ||
           (type->isRecordType() && HasImplicitInitialization(variableDeclaration));
}

/// EmitLocalBlockVarDecl - Emit code and set up an entry in LocalDeclMap for a
/// variable declaration with auto, register, or no storage class specifier.
/// These turn into simple stack objects, or GlobalValues depending on target.
void CodeGenFunction::EmitLocalBlockVarDecl(const VarDecl &D) {
  QualType Ty = D.getType();
  bool isByRef = D.hasAttr<BlocksAttr>();
  bool needsDispose = false;
  unsigned Align = 0;
  bool IsSimpleConstantInitializer = false;

  llvm::Value *DeclPtr;
  if (Ty->isConstantSizeType()) {
    if (!Target.useGlobalsForAutomaticVariables()) {
      
      // If this value is an array or struct, is POD, and if the initializer is
      // a staticly determinable constant, try to optimize it.
      if (D.getInit() && !isByRef &&
          (Ty->isArrayType() || Ty->isRecordType()) &&
          Ty->isPODType() &&
          D.getInit()->isConstantInitializer(getContext())) {
        // If this variable is marked 'const', emit the value as a global.
        if (CGM.getCodeGenOpts().MergeAllConstants &&
            Ty.isConstant(getContext())) {
          EmitStaticBlockVarDecl(D);
          return;
        }
        
        IsSimpleConstantInitializer = true;
      }
      
      // A normal fixed sized variable becomes an alloca in the entry block.
      const llvm::Type *LTy = ConvertTypeForMem(Ty);
      if (isByRef)
        LTy = BuildByRefType(&D);
      llvm::AllocaInst *Alloc = CreateTempAlloca(LTy);
      Alloc->setName(D.getNameAsString());

      Align = getContext().getDeclAlignInBytes(&D);
      if (isByRef)
        Align = std::max(Align, unsigned(Target.getPointerAlign(0) / 8));
      Alloc->setAlignment(Align);
      DeclPtr = Alloc;
    } else {
      // Targets that don't support recursion emit locals as globals.
      const char *Class =
        D.getStorageClass() == VarDecl::Register ? ".reg." : ".auto.";
      DeclPtr = CreateStaticBlockVarDecl(D, Class,
                                         llvm::GlobalValue
                                         ::InternalLinkage);
    }

    // FIXME: Can this happen?
    if (Ty->isVariablyModifiedType())
      EmitVLASize(Ty);
  } else {
    EnsureInsertPoint();

    if (!DidCallStackSave) {
      // Save the stack.
      const llvm::Type *LTy = llvm::Type::getInt8PtrTy(VMContext);
      llvm::Value *Stack = CreateTempAlloca(LTy, "saved_stack");

      llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
      llvm::Value *V = Builder.CreateCall(F);

      Builder.CreateStore(V, Stack);

      DidCallStackSave = true;

      {
        // Push a cleanup block and restore the stack there.
        DelayedCleanupBlock scope(*this);

        V = Builder.CreateLoad(Stack, "tmp");
        llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
        Builder.CreateCall(F, V);
      }
    }

    // Get the element type.
    const llvm::Type *LElemTy = ConvertTypeForMem(Ty);
    const llvm::Type *LElemPtrTy =
      llvm::PointerType::get(LElemTy, D.getType().getAddressSpace());

    llvm::Value *VLASize = EmitVLASize(Ty);

    // Downcast the VLA size expression
    VLASize = Builder.CreateIntCast(VLASize, llvm::Type::getInt32Ty(VMContext),
                                    false, "tmp");

    // Allocate memory for the array.
    llvm::AllocaInst *VLA = 
      Builder.CreateAlloca(llvm::Type::getInt8Ty(VMContext), VLASize, "vla");
    VLA->setAlignment(getContext().getDeclAlignInBytes(&D));

    DeclPtr = Builder.CreateBitCast(VLA, LElemPtrTy, "tmp");
  }

  llvm::Value *&DMEntry = LocalDeclMap[&D];
  assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
//.........这里部分代码省略.........