C++ CallArgList::push_back方法代码示例

// CopyObject - Utility to copy an object.  Calls copy constructor as necessary.
// DestPtr is casted to the right type.
static void CopyObject(CodeGenFunction &CGF, const Expr *E, 
                       llvm::Value *DestPtr, llvm::Value *ExceptionPtrPtr) {
  QualType ObjectType = E->getType();

  // Store the throw exception in the exception object.
  if (!CGF.hasAggregateLLVMType(ObjectType)) {
    llvm::Value *Value = CGF.EmitScalarExpr(E);
    const llvm::Type *ValuePtrTy = Value->getType()->getPointerTo();

    CGF.Builder.CreateStore(Value, 
                            CGF.Builder.CreateBitCast(DestPtr, ValuePtrTy));
  } else {
    const llvm::Type *Ty = CGF.ConvertType(ObjectType)->getPointerTo();
    const CXXRecordDecl *RD =
      cast<CXXRecordDecl>(ObjectType->getAs<RecordType>()->getDecl());
    
    llvm::Value *This = CGF.Builder.CreateBitCast(DestPtr, Ty);
    if (RD->hasTrivialCopyConstructor()) {
      CGF.EmitAggExpr(E, This, false);
    } else if (CXXConstructorDecl *CopyCtor
               = RD->getCopyConstructor(CGF.getContext(), 0)) {
      llvm::BasicBlock *PrevLandingPad = CGF.getInvokeDest();
      if (CGF.Exceptions) {
        CodeGenFunction::EHCleanupBlock Cleanup(CGF);
        llvm::Constant *FreeExceptionFn = getFreeExceptionFn(CGF);
        
        // Load the exception pointer.
        llvm::Value *ExceptionPtr = CGF.Builder.CreateLoad(ExceptionPtrPtr);
        CGF.Builder.CreateCall(FreeExceptionFn, ExceptionPtr);
      }

      llvm::Value *Src = CGF.EmitLValue(E).getAddress();
      CGF.setInvokeDest(PrevLandingPad);

      llvm::BasicBlock *TerminateHandler = CGF.getTerminateHandler();
      PrevLandingPad = CGF.getInvokeDest();
      CGF.setInvokeDest(TerminateHandler);

      // Stolen from EmitClassAggrMemberwiseCopy
      llvm::Value *Callee = CGF.CGM.GetAddrOfCXXConstructor(CopyCtor,
                                                            Ctor_Complete);
      CallArgList CallArgs;
      CallArgs.push_back(std::make_pair(RValue::get(This),
                                      CopyCtor->getThisType(CGF.getContext())));

      // Push the Src ptr.
      CallArgs.push_back(std::make_pair(RValue::get(Src),
                                        CopyCtor->getParamDecl(0)->getType()));
      QualType ResultType =
        CopyCtor->getType()->getAs<FunctionType>()->getResultType();
      CGF.EmitCall(CGF.CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
                   Callee, CallArgs, CopyCtor);
      CGF.setInvokeDest(PrevLandingPad);
    } else
      llvm_unreachable("uncopyable object");
  }
}

// CopyObject - Utility to copy an object.  Calls copy constructor as necessary.
// N is casted to the right type.
static void CopyObject(CodeGenFunction &CGF, QualType ObjectType,
                       bool WasPointer, bool WasPointerReference,
                       llvm::Value *E, llvm::Value *N) {
  // Store the throw exception in the exception object.
  if (WasPointer || !CGF.hasAggregateLLVMType(ObjectType)) {
    llvm::Value *Value = E;
    if (!WasPointer)
      Value = CGF.Builder.CreateLoad(Value);
    const llvm::Type *ValuePtrTy = Value->getType()->getPointerTo(0);
    if (WasPointerReference) {
      llvm::Value *Tmp = CGF.CreateTempAlloca(Value->getType(), "catch.param");
      CGF.Builder.CreateStore(Value, Tmp);
      Value = Tmp;
      ValuePtrTy = Value->getType()->getPointerTo(0);
    }
    N = CGF.Builder.CreateBitCast(N, ValuePtrTy);
    CGF.Builder.CreateStore(Value, N);
  } else {
    const llvm::Type *Ty = CGF.ConvertType(ObjectType)->getPointerTo(0);
    const CXXRecordDecl *RD;
    RD = cast<CXXRecordDecl>(ObjectType->getAs<RecordType>()->getDecl());
    llvm::Value *This = CGF.Builder.CreateBitCast(N, Ty);
    if (RD->hasTrivialCopyConstructor()) {
      CGF.EmitAggregateCopy(This, E, ObjectType);
    } else if (CXXConstructorDecl *CopyCtor
               = RD->getCopyConstructor(CGF.getContext(), 0)) {
      llvm::Value *Src = E;

      // Stolen from EmitClassAggrMemberwiseCopy
      llvm::Value *Callee = CGF.CGM.GetAddrOfCXXConstructor(CopyCtor,
                                                            Ctor_Complete);
      CallArgList CallArgs;
      CallArgs.push_back(std::make_pair(RValue::get(This),
                                      CopyCtor->getThisType(CGF.getContext())));

      // Push the Src ptr.
      CallArgs.push_back(std::make_pair(RValue::get(Src),
                                        CopyCtor->getParamDecl(0)->getType()));

      const FunctionProtoType *FPT
        = CopyCtor->getType()->getAs<FunctionProtoType>();
      CGF.EmitCall(CGF.CGM.getTypes().getFunctionInfo(CallArgs, FPT),
                   Callee, ReturnValueSlot(), CallArgs, CopyCtor);
    } else
      llvm_unreachable("uncopyable object");
  }
}

RValue CodeGenFunction::EmitCXXMemberCallExpr(const CXXMemberCallExpr *CE) {
  const MemberExpr *ME = cast<MemberExpr>(CE->getCallee());
  const CXXMethodDecl *MD = cast<CXXMethodDecl>(ME->getMemberDecl());
  assert(MD->isInstance() && 
         "Trying to emit a member call expr on a static method!");
  
  const FunctionProtoType *FPT = MD->getType()->getAsFunctionProtoType();
  const llvm::Type *Ty = 
    CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD), 
                                   FPT->isVariadic());
  llvm::Constant *Callee = CGM.GetAddrOfFunction(MD, Ty);
  
  llvm::Value *BaseValue = 0;
  
  // There's a deref operator node added in Sema::BuildCallToMemberFunction
  // that's giving the wrong type for -> call exprs so we just ignore them
  // for now.
  if (ME->isArrow())
    return EmitUnsupportedRValue(CE, "C++ member call expr");
  else {
    LValue BaseLV = EmitLValue(ME->getBase());
    BaseValue = BaseLV.getAddress();
  }
  
  CallArgList Args;
  
  // Push the 'this' pointer.
  Args.push_back(std::make_pair(RValue::get(BaseValue), 
                                MD->getThisType(getContext())));
  
  EmitCallArgs(Args, FPT, CE->arg_begin(), CE->arg_end());
  
  QualType ResultType = MD->getType()->getAsFunctionType()->getResultType();
  return EmitCall(CGM.getTypes().getFunctionInfo(ResultType, Args), 
                  Callee, Args, MD);
}

//.........这里部分代码省略.........
  QualType DtorTy(Ty);
  while (const ArrayType *Array = getContext().getAsArrayType(DtorTy))
    DtorTy = getContext().getBaseElementType(Array);
  if (const RecordType *RT = DtorTy->getAs<RecordType>())
    if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
      if (!ClassDecl->hasTrivialDestructor()) {
        const CXXDestructorDecl *D = ClassDecl->getDestructor(getContext());
        assert(D && "EmitLocalBlockVarDecl - destructor is nul");
        
        if (const ConstantArrayType *Array = 
              getContext().getAsConstantArrayType(Ty)) {
          {
            DelayedCleanupBlock Scope(*this);
            QualType BaseElementTy = getContext().getBaseElementType(Array);
            const llvm::Type *BasePtr = ConvertType(BaseElementTy);
            BasePtr = llvm::PointerType::getUnqual(BasePtr);
            llvm::Value *BaseAddrPtr =
              Builder.CreateBitCast(DeclPtr, BasePtr);
            EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr);
          
            // Make sure to jump to the exit block.
            EmitBranch(Scope.getCleanupExitBlock());
          }
          if (Exceptions) {
            EHCleanupBlock Cleanup(*this);
            QualType BaseElementTy = getContext().getBaseElementType(Array);
            const llvm::Type *BasePtr = ConvertType(BaseElementTy);
            BasePtr = llvm::PointerType::getUnqual(BasePtr);
            llvm::Value *BaseAddrPtr =
              Builder.CreateBitCast(DeclPtr, BasePtr);
            EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr);
          }
        } else {
          {
            DelayedCleanupBlock Scope(*this);
            EmitCXXDestructorCall(D, Dtor_Complete, DeclPtr);

            // Make sure to jump to the exit block.
            EmitBranch(Scope.getCleanupExitBlock());
          }
          if (Exceptions) {
            EHCleanupBlock Cleanup(*this);
            EmitCXXDestructorCall(D, Dtor_Complete, DeclPtr);
          }
        }
      }
  }

  // Handle the cleanup attribute
  if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
    const FunctionDecl *FD = CA->getFunctionDecl();

    llvm::Constant* F = CGM.GetAddrOfFunction(FD);
    assert(F && "Could not find function!");

    const CGFunctionInfo &Info = CGM.getTypes().getFunctionInfo(FD);

    // In some cases, the type of the function argument will be different from
    // the type of the pointer. An example of this is
    // void f(void* arg);
    // __attribute__((cleanup(f))) void *g;
    //
    // To fix this we insert a bitcast here.
    QualType ArgTy = Info.arg_begin()->type;
    {
      DelayedCleanupBlock scope(*this);

      CallArgList Args;
      Args.push_back(std::make_pair(RValue::get(Builder.CreateBitCast(DeclPtr,
                                                           ConvertType(ArgTy))),
                                    getContext().getPointerType(D.getType())));
      EmitCall(Info, F, Args);
    }
    if (Exceptions) {
      EHCleanupBlock Cleanup(*this);

      CallArgList Args;
      Args.push_back(std::make_pair(RValue::get(Builder.CreateBitCast(DeclPtr,
                                                           ConvertType(ArgTy))),
                                    getContext().getPointerType(D.getType())));
      EmitCall(Info, F, Args);
    }
  }

  if (needsDispose && CGM.getLangOptions().getGCMode() != LangOptions::GCOnly) {
    {
      DelayedCleanupBlock scope(*this);
      llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding");
      V = Builder.CreateLoad(V);
      BuildBlockRelease(V);
    }
    // FIXME: Turn this on and audit the codegen
    if (0 && Exceptions) {
      EHCleanupBlock Cleanup(*this);
      llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding");
      V = Builder.CreateLoad(V);
      BuildBlockRelease(V);
    }
  }
}

llvm::Constant *
CodeGenFunction::GenerateCovariantThunk(llvm::Function *Fn,
                                   GlobalDecl GD, bool Extern,
                                   const CovariantThunkAdjustment &Adjustment) {
  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
  const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
  QualType ResultType = FPT->getResultType();

  FunctionArgList Args;
  ImplicitParamDecl *ThisDecl =
    ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0,
                              MD->getThisType(getContext()));
  Args.push_back(std::make_pair(ThisDecl, ThisDecl->getType()));
  for (FunctionDecl::param_const_iterator i = MD->param_begin(),
         e = MD->param_end();
       i != e; ++i) {
    ParmVarDecl *D = *i;
    Args.push_back(std::make_pair(D, D->getType()));
  }
  IdentifierInfo *II
    = &CGM.getContext().Idents.get("__thunk_named_foo_");
  FunctionDecl *FD = FunctionDecl::Create(getContext(),
                                          getContext().getTranslationUnitDecl(),
                                          SourceLocation(), II, ResultType, 0,
                                          Extern
                                            ? FunctionDecl::Extern
                                            : FunctionDecl::Static,
                                          false, true);
  StartFunction(FD, ResultType, Fn, Args, SourceLocation());

  // generate body
  const llvm::Type *Ty =
    CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
                                   FPT->isVariadic());
  llvm::Value *Callee = CGM.GetAddrOfFunction(GD, Ty);

  CallArgList CallArgs;

  bool ShouldAdjustReturnPointer = true;
  QualType ArgType = MD->getThisType(getContext());
  llvm::Value *Arg = Builder.CreateLoad(LocalDeclMap[ThisDecl], "this");
  if (!Adjustment.ThisAdjustment.isEmpty()) {
    // Do the this adjustment.
    const llvm::Type *OrigTy = Callee->getType();
    Arg = DynamicTypeAdjust(Arg, Adjustment.ThisAdjustment);
    
    if (!Adjustment.ReturnAdjustment.isEmpty()) {
      const CovariantThunkAdjustment &ReturnAdjustment = 
        CovariantThunkAdjustment(ThunkAdjustment(),
                                 Adjustment.ReturnAdjustment);
      
      Callee = CGM.BuildCovariantThunk(GD, Extern, ReturnAdjustment);
      
      Callee = Builder.CreateBitCast(Callee, OrigTy);
      ShouldAdjustReturnPointer = false;
    }
  }    

  CallArgs.push_back(std::make_pair(RValue::get(Arg), ArgType));

  for (FunctionDecl::param_const_iterator i = MD->param_begin(),
         e = MD->param_end();
       i != e; ++i) {
    ParmVarDecl *D = *i;
    QualType ArgType = D->getType();

    // llvm::Value *Arg = CGF.GetAddrOfLocalVar(Dst);
    Expr *Arg = new (getContext()) DeclRefExpr(D, ArgType.getNonReferenceType(),
                                               SourceLocation());
    CallArgs.push_back(std::make_pair(EmitCallArg(Arg, ArgType), ArgType));
  }

  RValue RV = EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs,
                                                      FPT->getCallConv(),
                                                      FPT->getNoReturnAttr()),
                       Callee, ReturnValueSlot(), CallArgs, MD);
  if (ShouldAdjustReturnPointer && !Adjustment.ReturnAdjustment.isEmpty()) {
    bool CanBeZero = !(ResultType->isReferenceType()
    // FIXME: attr nonnull can't be zero either
                       /* || ResultType->hasAttr<NonNullAttr>() */ );
    // Do the return result adjustment.
    if (CanBeZero) {
      llvm::BasicBlock *NonZeroBlock = createBasicBlock();
      llvm::BasicBlock *ZeroBlock = createBasicBlock();
      llvm::BasicBlock *ContBlock = createBasicBlock();

      const llvm::Type *Ty = RV.getScalarVal()->getType();
      llvm::Value *Zero = llvm::Constant::getNullValue(Ty);
      Builder.CreateCondBr(Builder.CreateICmpNE(RV.getScalarVal(), Zero),
                           NonZeroBlock, ZeroBlock);
      EmitBlock(NonZeroBlock);
      llvm::Value *NZ = 
        DynamicTypeAdjust(RV.getScalarVal(), Adjustment.ReturnAdjustment);
      EmitBranch(ContBlock);
      EmitBlock(ZeroBlock);
      llvm::Value *Z = RV.getScalarVal();
      EmitBlock(ContBlock);
      llvm::PHINode *RVOrZero = Builder.CreatePHI(Ty);
      RVOrZero->reserveOperandSpace(2);
      RVOrZero->addIncoming(NZ, NonZeroBlock);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    int flag = 0;
    int flags = 0;

    needsDispose = true;

    if (Ty->isBlockPointerType()) {
      flag |= BLOCK_FIELD_IS_BLOCK;
      flags |= BLOCK_HAS_COPY_DISPOSE;
    } else if (BlockRequiresCopying(Ty)) {
      flag |= BLOCK_FIELD_IS_OBJECT;
      flags |= BLOCK_HAS_COPY_DISPOSE;
    }

    // FIXME: Someone double check this.
    if (Ty.isObjCGCWeak())
      flag |= BLOCK_FIELD_IS_WEAK;

    int isa = 0;
    if (flag&BLOCK_FIELD_IS_WEAK)
      isa = 1;
    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), isa);
    V = Builder.CreateIntToPtr(V, PtrToInt8Ty, "isa");
    Builder.CreateStore(V, isa_field);

    V = Builder.CreateBitCast(DeclPtr, PtrToInt8Ty, "forwarding");
    Builder.CreateStore(V, forwarding_field);

    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), flags);
    Builder.CreateStore(V, flags_field);

    const llvm::Type *V1;
    V1 = cast<llvm::PointerType>(DeclPtr->getType())->getElementType();
    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
                               (CGM.getTargetData().getTypeStoreSizeInBits(V1)
                                / 8));
    Builder.CreateStore(V, size_field);

    if (flags & BLOCK_HAS_COPY_DISPOSE) {
      BlockHasCopyDispose = true;
      llvm::Value *copy_helper = Builder.CreateStructGEP(DeclPtr, 4);
      Builder.CreateStore(BuildbyrefCopyHelper(DeclPtr->getType(), flag, Align),
                          copy_helper);

      llvm::Value *destroy_helper = Builder.CreateStructGEP(DeclPtr, 5);
      Builder.CreateStore(BuildbyrefDestroyHelper(DeclPtr->getType(), flag,
                                                  Align),
                          destroy_helper);
    }
  }

  // Handle CXX destruction of variables.
  QualType DtorTy(Ty);
  if (const ArrayType *Array = DtorTy->getAs<ArrayType>())
    DtorTy = Array->getElementType();
  if (const RecordType *RT = DtorTy->getAs<RecordType>())
    if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
      if (!ClassDecl->hasTrivialDestructor()) {
        const CXXDestructorDecl *D = ClassDecl->getDestructor(getContext());
        assert(D && "EmitLocalBlockVarDecl - destructor is nul");
        assert(!Ty->getAs<ArrayType>() && "FIXME - destruction of arrays NYI");
        
        CleanupScope scope(*this);
        EmitCXXDestructorCall(D, Dtor_Complete, DeclPtr);
      }
  }
    
  // Handle the cleanup attribute
  if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
    const FunctionDecl *FD = CA->getFunctionDecl();
    
    llvm::Constant* F = CGM.GetAddrOfFunction(GlobalDecl(FD));
    assert(F && "Could not find function!");
  
    CleanupScope scope(*this);

    const CGFunctionInfo &Info = CGM.getTypes().getFunctionInfo(FD);

    // In some cases, the type of the function argument will be different from
    // the type of the pointer. An example of this is
    // void f(void* arg);
    // __attribute__((cleanup(f))) void *g;
    // 
    // To fix this we insert a bitcast here.
    QualType ArgTy = Info.arg_begin()->type;
    DeclPtr = Builder.CreateBitCast(DeclPtr, ConvertType(ArgTy));
    
    CallArgList Args;
    Args.push_back(std::make_pair(RValue::get(DeclPtr), 
                                  getContext().getPointerType(D.getType())));
    
    EmitCall(Info, F, Args);
  }

  if (needsDispose && CGM.getLangOptions().getGCMode() != LangOptions::GCOnly) {
    CleanupScope scope(*this);
    llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding");
    V = Builder.CreateLoad(V, false);
    BuildBlockRelease(V);
  }
}