private void UnaryOperatorEasyOut(UnaryOperatorKind kind, BoundExpression operand, UnaryOperatorOverloadResolutionResult result)
{
var operandType = operand.Type;
if ((object)operandType == null)
{
return;
}
var easyOut = UnopEasyOut.OpKind(kind, operandType);
if (easyOut == UnaryOperatorKind.Error)
{
return;
}
UnaryOperatorSignature signature = this.Compilation.builtInOperators.GetSignature(easyOut);
Conversion?conversion = Conversions.FastClassifyConversion(operandType, signature.OperandType);
Debug.Assert(conversion.HasValue && conversion.Value.IsImplicit);
result.Results.Add(UnaryOperatorAnalysisResult.Applicable(signature, conversion.Value));
}
private static UnaryOperatorSignature?GetPointerOperation(UnaryOperatorKind kind, BoundExpression operand)
{
Debug.Assert(operand != null);
var pointerType = operand.Type as PointerTypeSymbol;
if ((object)pointerType == null)
{
return(null);
}
UnaryOperatorSignature?op = null;
switch (kind)
{
case UnaryOperatorKind.PostfixIncrement:
case UnaryOperatorKind.PostfixDecrement:
case UnaryOperatorKind.PrefixIncrement:
case UnaryOperatorKind.PrefixDecrement:
op = new UnaryOperatorSignature(kind | UnaryOperatorKind.Pointer, pointerType, pointerType);
break;
}
return(op);
}
/// <summary>
/// Produce an element-wise comparison and logic to ensure the result is a bool type.
///
/// If an element-wise comparison doesn't return bool, then:
/// - if it is dynamic, we'll do <c>!(comparisonResult.false)</c> or <c>comparisonResult.true</c>
/// - if it implicitly converts to bool, we'll just do the conversion
/// - otherwise, we'll do <c>!(comparisonResult.false)</c> or <c>comparisonResult.true</c> (as we'd do for <c>if</c> or <c>while</c>)
/// </summary>
private BoundExpression RewriteTupleSingleOperator(TupleBinaryOperatorInfo.Single single,
BoundExpression left, BoundExpression right, TypeSymbol boolType, BinaryOperatorKind operatorKind)
{
if (single.Kind.IsDynamic())
{
// Produce
// !((left == right).op_false)
// (left != right).op_true
BoundExpression dynamicResult = _dynamicFactory.MakeDynamicBinaryOperator(single.Kind, left, right, isCompoundAssignment: false, _compilation.DynamicType).ToExpression();
if (operatorKind == BinaryOperatorKind.Equal)
{
return(_factory.Not(MakeUnaryOperator(UnaryOperatorKind.DynamicFalse, left.Syntax, method: null, dynamicResult, boolType)));
}
else
{
return(MakeUnaryOperator(UnaryOperatorKind.DynamicTrue, left.Syntax, method: null, dynamicResult, boolType));
}
}
if (left.IsLiteralNull() && right.IsLiteralNull())
{
// For `null == null` this is special-cased during initial binding
return(new BoundLiteral(left.Syntax, ConstantValue.Create(operatorKind == BinaryOperatorKind.Equal), boolType));
}
// We leave both operands in nullable-null conversions unconverted, MakeBinaryOperator has special for null-literal
bool isNullableNullConversion = single.Kind.OperandTypes() == BinaryOperatorKind.NullableNull;
BoundExpression convertedLeft = isNullableNullConversion
? left
: MakeConversionNode(left.Syntax, left, single.LeftConversion, single.LeftConvertedTypeOpt, @checked: false);
BoundExpression convertedRight = isNullableNullConversion
? right
: MakeConversionNode(right.Syntax, right, single.RightConversion, single.RightConvertedTypeOpt, @checked: false);
BoundExpression binary = MakeBinaryOperator(_factory.Syntax, single.Kind, convertedLeft, convertedRight, single.MethodSymbolOpt?.ReturnType.TypeSymbol ?? boolType, single.MethodSymbolOpt);
UnaryOperatorSignature boolOperator = single.BoolOperator;
Conversion boolConversion = single.ConversionForBool;
BoundExpression result;
if (boolOperator.Kind != UnaryOperatorKind.Error)
{
// Produce
// !((left == right).op_false)
// (left != right).op_true
BoundExpression convertedBinary = MakeConversionNode(_factory.Syntax, binary, boolConversion, boolOperator.OperandType, @checked: false);
Debug.Assert(boolOperator.ReturnType.SpecialType == SpecialType.System_Boolean);
result = MakeUnaryOperator(boolOperator.Kind, binary.Syntax, boolOperator.Method, convertedBinary, boolType);
if (operatorKind == BinaryOperatorKind.Equal)
{
result = _factory.Not(result);
}
}
else if (!boolConversion.IsIdentity)
{
// Produce
// (bool)(left == right)
// (bool)(left != right)
result = MakeConversionNode(_factory.Syntax, binary, boolConversion, boolType, @checked: false);
}
else
{
result = binary;
}
return(result);
}
public static UnaryOperatorAnalysisResult Inapplicable(UnaryOperatorSignature signature, Conversion conversion)
{
return(new UnaryOperatorAnalysisResult(OperatorAnalysisResultKind.Inapplicable, signature, conversion));
}
private UnaryOperatorAnalysisResult(OperatorAnalysisResultKind kind, UnaryOperatorSignature signature, Conversion conversion)
{
this.Kind = kind;
this.Signature = signature;
this.Conversion = conversion;
}