public override BoundNode VisitIsOperator(BoundIsOperator node)
{
BoundSpillSequenceBuilder builder = null;
var operand = VisitExpression(ref builder, node.Operand);
return(UpdateExpression(builder, node.Update(operand, node.TargetType, node.Conversion, node.Type)));
}
public override BoundNode VisitIsOperator(BoundIsOperator node)
{
BoundExpression operand = (BoundExpression)this.Visit(node.Operand);
BoundTypeExpression targetType = (BoundTypeExpression)this.Visit(node.TargetType);
TypeSymbol type = this.VisitType(node.Type);
if (operand.Kind != BoundKind.SpillSequence)
{
return(node.Update(operand, targetType, node.Conversion, type));
}
var spill = (BoundSpillSequence)operand;
var newIsOperator = node.Update(spill.Value, targetType, node.Conversion, type);
return(RewriteSpillSequence(spill, newIsOperator));
}
private BoundExpression MakeIsOperator(
BoundIsOperator oldNode,
SyntaxNode syntax,
BoundExpression rewrittenOperand,
BoundTypeExpression rewrittenTargetType,
Conversion conversion,
TypeSymbol rewrittenType)
{
if (rewrittenOperand.Kind == BoundKind.MethodGroup)
{
var methodGroup = (BoundMethodGroup)rewrittenOperand;
BoundExpression receiver = methodGroup.ReceiverOpt;
if (receiver != null && receiver.Kind != BoundKind.ThisReference)
{
// possible side-effect
return(RewriteConstantIsOperator(receiver.Syntax, receiver, ConstantValue.False, rewrittenType));
}
else
{
return(MakeLiteral(syntax, ConstantValue.False, rewrittenType));
}
}
var operandType = rewrittenOperand.Type;
var targetType = rewrittenTargetType.Type;
Debug.Assert((object)operandType != null || rewrittenOperand.ConstantValue.IsNull);
Debug.Assert((object)targetType != null);
// TODO: Handle dynamic operand type and target type
if (!_inExpressionLambda)
{
ConstantValue constantValue = Binder.GetIsOperatorConstantResult(operandType, targetType, conversion.Kind, rewrittenOperand.ConstantValue);
if (constantValue != null)
{
return(RewriteConstantIsOperator(syntax, rewrittenOperand, constantValue, rewrittenType));
}
else if (conversion.IsImplicit)
{
// operand is a reference type with bound identity or implicit conversion
// We can replace the "is" instruction with a null check
return(MakeNullCheck(syntax, rewrittenOperand, BinaryOperatorKind.NotEqual));
}
}
return(oldNode.Update(rewrittenOperand, rewrittenTargetType, conversion, rewrittenType));
}
private BoundExpression MakeIsOperator(
BoundIsOperator oldNode,
SyntaxNode syntax,
BoundExpression rewrittenOperand,
BoundTypeExpression rewrittenTargetType,
Conversion conversion,
TypeSymbol rewrittenType)
{
if (rewrittenOperand.Kind == BoundKind.MethodGroup)
{
var methodGroup = (BoundMethodGroup)rewrittenOperand;
BoundExpression receiver = methodGroup.ReceiverOpt;
if (receiver != null && receiver.Kind != BoundKind.ThisReference)
{
// possible side-effect
return(RewriteConstantIsOperator(receiver.Syntax, receiver, ConstantValue.False, rewrittenType));
}
else
{
return(MakeLiteral(syntax, ConstantValue.False, rewrittenType));
}
}
var operandType = rewrittenOperand.Type;
var targetType = rewrittenTargetType.Type;
Debug.Assert((object)operandType != null || rewrittenOperand.ConstantValue.IsNull);
Debug.Assert((object)targetType != null);
// TODO: Handle dynamic operand type and target type
if (!_inExpressionLambda)
{
ConstantValue constantValue = Binder.GetIsOperatorConstantResult(operandType, targetType, conversion.Kind, rewrittenOperand.ConstantValue);
if (constantValue != null)
{
return(RewriteConstantIsOperator(syntax, rewrittenOperand, constantValue, rewrittenType));
}
else if (conversion.IsImplicit)
{
// operand is a reference type with bound identity or implicit conversion
// We can replace the "is" instruction with a null check
Debug.Assert((object)operandType != null);
if (operandType.TypeKind == TypeKind.TypeParameter)
{
// We need to box the type parameter even if it is a known
// reference type to ensure there are no verifier errors
rewrittenOperand = MakeConversionNode(
syntax: rewrittenOperand.Syntax,
rewrittenOperand: rewrittenOperand,
conversion: Conversion.Boxing,
rewrittenType: _compilation.GetSpecialType(SpecialType.System_Object),
@checked: false);
}
return(MakeNullCheck(syntax, rewrittenOperand, BinaryOperatorKind.NotEqual));
}
}
return(oldNode.Update(rewrittenOperand, rewrittenTargetType, conversion, rewrittenType));
}
