C++ ParmVarDecl::getLocation方法代码示例

ExprResult Sema::BuildBlockForLambdaConversion(SourceLocation CurrentLocation,
                                               SourceLocation ConvLocation,
                                               CXXConversionDecl *Conv,
                                               Expr *Src) {
  // Make sure that the lambda call operator is marked used.
  CXXRecordDecl *Lambda = Conv->getParent();
  CXXMethodDecl *CallOperator 
    = cast<CXXMethodDecl>(
        *Lambda->lookup(
          Context.DeclarationNames.getCXXOperatorName(OO_Call)).first);
  CallOperator->setReferenced();
  CallOperator->setUsed();

  ExprResult Init = PerformCopyInitialization(
                      InitializedEntity::InitializeBlock(ConvLocation, 
                                                         Src->getType(), 
                                                         /*NRVO=*/false),
                      CurrentLocation, Src);
  if (!Init.isInvalid())
    Init = ActOnFinishFullExpr(Init.take());
  
  if (Init.isInvalid())
    return ExprError();
  
  // Create the new block to be returned.
  BlockDecl *Block = BlockDecl::Create(Context, CurContext, ConvLocation);

  // Set the type information.
  Block->setSignatureAsWritten(CallOperator->getTypeSourceInfo());
  Block->setIsVariadic(CallOperator->isVariadic());
  Block->setBlockMissingReturnType(false);

  // Add parameters.
  SmallVector<ParmVarDecl *, 4> BlockParams;
  for (unsigned I = 0, N = CallOperator->getNumParams(); I != N; ++I) {
    ParmVarDecl *From = CallOperator->getParamDecl(I);
    BlockParams.push_back(ParmVarDecl::Create(Context, Block,
                                              From->getLocStart(),
                                              From->getLocation(),
                                              From->getIdentifier(),
                                              From->getType(),
                                              From->getTypeSourceInfo(),
                                              From->getStorageClass(),
                                            From->getStorageClassAsWritten(),
                                              /*DefaultArg=*/0));
  }
  Block->setParams(BlockParams);

  Block->setIsConversionFromLambda(true);

  // Add capture. The capture uses a fake variable, which doesn't correspond
  // to any actual memory location. However, the initializer copy-initializes
  // the lambda object.
  TypeSourceInfo *CapVarTSI =
      Context.getTrivialTypeSourceInfo(Src->getType());
  VarDecl *CapVar = VarDecl::Create(Context, Block, ConvLocation,
                                    ConvLocation, 0,
                                    Src->getType(), CapVarTSI,
                                    SC_None, SC_None);
  BlockDecl::Capture Capture(/*Variable=*/CapVar, /*ByRef=*/false,
                             /*Nested=*/false, /*Copy=*/Init.take());
  Block->setCaptures(Context, &Capture, &Capture + 1, 
                     /*CapturesCXXThis=*/false);

  // Add a fake function body to the block. IR generation is responsible
  // for filling in the actual body, which cannot be expressed as an AST.
  Block->setBody(new (Context) CompoundStmt(ConvLocation));

  // Create the block literal expression.
  Expr *BuildBlock = new (Context) BlockExpr(Block, Conv->getConversionType());
  ExprCleanupObjects.push_back(Block);
  ExprNeedsCleanups = true;

  return BuildBlock;
}

/// \brief Add a lambda's conversion to function pointer, as described in
/// C++11 [expr.prim.lambda]p6.
static void addFunctionPointerConversion(Sema &S, 
                                         SourceRange IntroducerRange,
                                         CXXRecordDecl *Class,
                                         CXXMethodDecl *CallOperator) {
  // Add the conversion to function pointer.
  const FunctionProtoType *Proto
    = CallOperator->getType()->getAs<FunctionProtoType>(); 
  QualType FunctionPtrTy;
  QualType FunctionTy;
  {
    FunctionProtoType::ExtProtoInfo ExtInfo = Proto->getExtProtoInfo();
    ExtInfo.TypeQuals = 0;
    FunctionTy = S.Context.getFunctionType(Proto->getResultType(),
                                           Proto->arg_type_begin(),
                                           Proto->getNumArgs(),
                                           ExtInfo);
    FunctionPtrTy = S.Context.getPointerType(FunctionTy);
  }
  
  FunctionProtoType::ExtProtoInfo ExtInfo;
  ExtInfo.TypeQuals = Qualifiers::Const;
  QualType ConvTy = S.Context.getFunctionType(FunctionPtrTy, 0, 0, ExtInfo);
  
  SourceLocation Loc = IntroducerRange.getBegin();
  DeclarationName Name
    = S.Context.DeclarationNames.getCXXConversionFunctionName(
        S.Context.getCanonicalType(FunctionPtrTy));
  DeclarationNameLoc NameLoc;
  NameLoc.NamedType.TInfo = S.Context.getTrivialTypeSourceInfo(FunctionPtrTy,
                                                               Loc);
  CXXConversionDecl *Conversion 
    = CXXConversionDecl::Create(S.Context, Class, Loc, 
                                DeclarationNameInfo(Name, Loc, NameLoc),
                                ConvTy, 
                                S.Context.getTrivialTypeSourceInfo(ConvTy, 
                                                                   Loc),
                                /*isInline=*/false, /*isExplicit=*/false,
                                /*isConstexpr=*/false, 
                                CallOperator->getBody()->getLocEnd());
  Conversion->setAccess(AS_public);
  Conversion->setImplicit(true);
  Class->addDecl(Conversion);
  
  // Add a non-static member function "__invoke" that will be the result of
  // the conversion.
  Name = &S.Context.Idents.get("__invoke");
  CXXMethodDecl *Invoke
    = CXXMethodDecl::Create(S.Context, Class, Loc, 
                            DeclarationNameInfo(Name, Loc), FunctionTy, 
                            CallOperator->getTypeSourceInfo(),
                            /*IsStatic=*/true, SC_Static, /*IsInline=*/true,
                            /*IsConstexpr=*/false, 
                            CallOperator->getBody()->getLocEnd());
  SmallVector<ParmVarDecl *, 4> InvokeParams;
  for (unsigned I = 0, N = CallOperator->getNumParams(); I != N; ++I) {
    ParmVarDecl *From = CallOperator->getParamDecl(I);
    InvokeParams.push_back(ParmVarDecl::Create(S.Context, Invoke,
                                               From->getLocStart(),
                                               From->getLocation(),
                                               From->getIdentifier(),
                                               From->getType(),
                                               From->getTypeSourceInfo(),
                                               From->getStorageClass(),
                                               From->getStorageClassAsWritten(),
                                               /*DefaultArg=*/0));
  }
  Invoke->setParams(InvokeParams);
  Invoke->setAccess(AS_private);
  Invoke->setImplicit(true);
  Class->addDecl(Invoke);
}