C++ LValue::getType方法代码示例

/// EmitLoadOfLValue - Given an RValue reference for a complex, emit code to
/// load the real and imaginary pieces, returning them as Real/Imag.
ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(LValue lvalue,
                                                   SourceLocation loc) {
  assert(lvalue.isSimple() && "non-simple complex l-value?");
  if (lvalue.getType()->isAtomicType())
    return CGF.EmitAtomicLoad(lvalue, loc).getComplexVal();

  llvm::Value *SrcPtr = lvalue.getAddress();
  bool isVolatile = lvalue.isVolatileQualified();
  unsigned AlignR = lvalue.getAlignment().getQuantity();
  ASTContext &C = CGF.getContext();
  QualType ComplexTy = lvalue.getType();
  unsigned ComplexAlign = C.getTypeAlignInChars(ComplexTy).getQuantity();
  unsigned AlignI = std::min(AlignR, ComplexAlign);

  llvm::Value *Real=nullptr, *Imag=nullptr;

  if (!IgnoreReal || isVolatile) {
    llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
                                                 SrcPtr->getName() + ".realp");
    Real = Builder.CreateAlignedLoad(RealP, AlignR, isVolatile,
                                     SrcPtr->getName() + ".real");
  }

  if (!IgnoreImag || isVolatile) {
    llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
                                                 SrcPtr->getName() + ".imagp");
    Imag = Builder.CreateAlignedLoad(ImagP, AlignI, isVolatile,
                                     SrcPtr->getName() + ".imag");
  }
  return ComplexPairTy(Real, Imag);
}

/// EmitStoreOfComplex - Store the specified real/imag parts into the
/// specified value pointer.
void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, LValue lvalue,
                                            bool isInit) {
  if (lvalue.getType()->isAtomicType() ||
      (!isInit && CGF.LValueIsSuitableForInlineAtomic(lvalue)))
    return CGF.EmitAtomicStore(RValue::getComplex(Val), lvalue, isInit);

  Address Ptr = lvalue.getAddress();
  Address RealPtr = CGF.emitAddrOfRealComponent(Ptr, lvalue.getType());
  Address ImagPtr = CGF.emitAddrOfImagComponent(Ptr, lvalue.getType());

  Builder.CreateStore(Val.first, RealPtr, lvalue.isVolatileQualified());
  Builder.CreateStore(Val.second, ImagPtr, lvalue.isVolatileQualified());
}

void 
AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) {
  QualType type = LV.getType();
  // FIXME: Ignore result?
  // FIXME: Are initializers affected by volatile?
  if (Dest.isZeroed() && isSimpleZero(E, CGF)) {
    // Storing "i32 0" to a zero'd memory location is a noop.
  } else if (isa<ImplicitValueInitExpr>(E)) {
    EmitNullInitializationToLValue(LV);
  } else if (type->isReferenceType()) {
    RValue RV = CGF.EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0);
    CGF.EmitStoreThroughLValue(RV, LV);
  } else if (type->isAnyComplexType()) {
    CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false);
  } else if (CGF.hasAggregateLLVMType(type)) {
    CGF.EmitAggExpr(E, AggValueSlot::forLValue(LV,
                                               AggValueSlot::IsDestructed,
                                      AggValueSlot::DoesNotNeedGCBarriers,
                                               AggValueSlot::IsNotAliased,
                                               Dest.isZeroed()));
  } else if (LV.isSimple()) {
    CGF.EmitScalarInit(E, /*D=*/0, LV, /*Captured=*/false);
  } else {
    CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV);
  }
}

void AggExprEmitter::EmitNullInitializationToLValue(LValue lv) {
  QualType type = lv.getType();

  // If the destination slot is already zeroed out before the aggregate is
  // copied into it, we don't have to emit any zeros here.
  if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type))
    return;
  
  if (!CGF.hasAggregateLLVMType(type)) {
    // For non-aggregates, we can store zero
    llvm::Value *null = llvm::Constant::getNullValue(CGF.ConvertType(type));
    CGF.EmitStoreThroughLValue(RValue::get(null), lv);
  } else {
    // There's a potential optimization opportunity in combining
    // memsets; that would be easy for arrays, but relatively
    // difficult for structures with the current code.
    CGF.EmitNullInitialization(lv.getAddress(), lv.getType());
  }
}

/// EmitStoreOfComplex - Store the specified real/imag parts into the
/// specified value pointer.
void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, LValue lvalue,
                                            bool isInit) {
  if (lvalue.getType()->isAtomicType())
    return CGF.EmitAtomicStore(RValue::getComplex(Val), lvalue, isInit);

  llvm::Value *Ptr = lvalue.getAddress();
  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
  unsigned AlignR = lvalue.getAlignment().getQuantity();
  ASTContext &C = CGF.getContext();
  QualType ComplexTy = lvalue.getType();
  unsigned ComplexAlign = C.getTypeAlignInChars(ComplexTy).getQuantity();
  unsigned AlignI = std::min(AlignR, ComplexAlign);

  Builder.CreateAlignedStore(Val.first, RealPtr, AlignR,
                             lvalue.isVolatileQualified());
  Builder.CreateAlignedStore(Val.second, ImagPtr, AlignI,
                             lvalue.isVolatileQualified());
}

/// EmitStoreOfComplex - Store the specified real/imag parts into the
/// specified value pointer.
void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val,
                                            LValue lvalue,
                                            bool isInit) {
  if (lvalue.getType()->isAtomicType())
    return CGF.EmitAtomicStore(RValue::getComplex(Val), lvalue, isInit);

  llvm::Value *Ptr = lvalue.getAddress();
  llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
  llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");

  // TODO: alignment
  Builder.CreateStore(Val.first, RealPtr, lvalue.isVolatileQualified());
  Builder.CreateStore(Val.second, ImagPtr, lvalue.isVolatileQualified());
}

/// EmitLoadOfLValue - Given an RValue reference for a complex, emit code to
/// load the real and imaginary pieces, returning them as Real/Imag.
ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(LValue lvalue,
                                                   SourceLocation loc) {
  assert(lvalue.isSimple() && "non-simple complex l-value?");
  if (lvalue.getType()->isAtomicType())
    return CGF.EmitAtomicLoad(lvalue, loc).getComplexVal();

  Address SrcPtr = lvalue.getAddress();
  bool isVolatile = lvalue.isVolatileQualified();

  llvm::Value *Real = nullptr, *Imag = nullptr;

  if (!IgnoreReal || isVolatile) {
    Address RealP = CGF.emitAddrOfRealComponent(SrcPtr, lvalue.getType());
    Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr.getName() + ".real");
  }

  if (!IgnoreImag || isVolatile) {
    Address ImagP = CGF.emitAddrOfImagComponent(SrcPtr, lvalue.getType());
    Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr.getName() + ".imag");
  }

  return ComplexPairTy(Real, Imag);
}

/// EmitLoadOfLValue - Given an RValue reference for a complex, emit code to
/// load the real and imaginary pieces, returning them as Real/Imag.
ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(LValue lvalue) {
  assert(lvalue.isSimple() && "non-simple complex l-value?");
  if (lvalue.getType()->isAtomicType())
    return CGF.EmitAtomicLoad(lvalue).getComplexVal();

  llvm::Value *SrcPtr = lvalue.getAddress();
  bool isVolatile = lvalue.isVolatileQualified();

  llvm::Value *Real=0, *Imag=0;

  if (!IgnoreReal || isVolatile) {
    llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
                                                 SrcPtr->getName() + ".realp");
    Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
  }

  if (!IgnoreImag || isVolatile) {
    llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
                                                 SrcPtr->getName() + ".imagp");
    Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
  }
  return ComplexPairTy(Real, Imag);
}