public void LessArgumentsPassedToParamsIsBetter()
{
OverloadResolution r = new OverloadResolution(compilation, MakeArgumentList(typeof(int), typeof(int), typeof(int)));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(MakeParamsMethod(typeof(int[]))));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(MakeParamsMethod(typeof(int), typeof(int[]))));
Assert.IsFalse(r.IsAmbiguous);
Assert.AreEqual(2, r.BestCandidate.Parameters.Count);
}
public void PreferIntOverUInt()
{
OverloadResolution r = new OverloadResolution(compilation, MakeArgumentList(typeof(ushort)));
var c1 = MakeMethod(typeof(int));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(c1));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(MakeMethod(typeof(uint))));
Assert.IsFalse(r.IsAmbiguous);
Assert.AreSame(c1, r.BestCandidate);
}
public void PreferUIntOverLong_FromIntLiteral()
{
ResolveResult[] args = { new ConstantResolveResult(compilation.FindType(KnownTypeCode.Int32), 1) };
OverloadResolution r = new OverloadResolution(compilation, args);
var c1 = MakeMethod(typeof(uint));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(c1));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(MakeMethod(typeof(long))));
Assert.IsFalse(r.IsAmbiguous);
Assert.AreSame(c1, r.BestCandidate);
}
public void PreferMethodWithoutOptionalParameters()
{
var m1 = MakeMethod();
var m2 = MakeMethod(1);
OverloadResolution r = new OverloadResolution(compilation, MakeArgumentList());
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(m1));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(m2));
Assert.IsFalse(r.IsAmbiguous);
Assert.AreSame(m1, r.BestCandidate);
}
public void NullableIntAndNullableUIntIsAmbiguous()
{
OverloadResolution r = new OverloadResolution(compilation, MakeArgumentList(typeof(ushort?)));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(MakeMethod(typeof(int?))));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(MakeMethod(typeof(uint?))));
Assert.AreEqual(OverloadResolutionErrors.AmbiguousMatch, r.BestCandidateErrors);
// then adding a matching overload solves the ambiguity:
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(MakeMethod(typeof(ushort?))));
Assert.AreEqual(OverloadResolutionErrors.None, r.BestCandidateErrors);
Assert.IsNull(r.BestCandidateAmbiguousWith);
}
/// <summary>
/// Resolves an object creation.
/// </summary>
/// <param name="type">Type of the object to create.</param>
/// <param name="arguments">
/// Arguments passed to the constructor.
/// The resolver may mutate this array to wrap elements in <see cref="CastExpression"/>s!
/// </param>
/// <param name="argumentNames">
/// The argument names. Pass the null string for positional arguments.
/// </param>
/// <param name="allowProtectedAccess">
/// Whether to allow calling protected constructors.
/// This should be false except when resolving constructor initializers.
/// </param>
/// <param name="initializerStatements">
/// Statements for Objects/Collections initializer.
/// <see cref="InvocationExpression.InitializerStatements"/>
/// </param>
/// <returns>InvocationResolveResult or ErrorResolveResult</returns>
public static Expression ResolveObjectCreation(ResolveContext rc, Location l, IType type, Expression[] arguments, string[] argumentNames = null, bool allowProtectedAccess = false, IList <Expression> initializerStatements = null)
{
if (type.Kind == TypeKind.Delegate)
{
if (arguments == null || arguments.Length != 1)
{
rc.Report.Error(0, l, "Method name expected");
return(null);
}
Expression input = arguments[0];
IMethod invoke = input.Type.GetDelegateInvokeMethod();
if (invoke != null)
{
input = new MethodGroupExpression(
input, invoke.Name,
methods: new[] { new MethodListWithDeclaringType(input.Type)
{
invoke
} },
typeArguments: EmptyList <IType> .Instance
);
}
return(rc.Convert(input, type));
}
OverloadResolution or = rc.CreateOverloadResolution(arguments, argumentNames);
MemberLookup lookup = rc.CreateMemberLookup();
List <IMethod> allApplicable = null;
foreach (IMethod ctor in type.GetConstructors())
{
if (lookup.IsAccessible(ctor, allowProtectedAccess))
{
or.AddCandidate(ctor);
}
else
{
or.AddCandidate(ctor, OverloadResolutionErrors.Inaccessible);
}
}
if (or.BestCandidate != null)
{
return(or.CreateInvocation(null, initializerStatements));
}
else
{
rc.Report.Error(0, l,
"The type `{0}' does not contain a constructor that takes `{1}' arguments",
type.ToString(), arguments != null ? arguments.Length.ToString() : "0");
return(ErrorResult);
}
}
public void SkeetEvilOverloadResolution()
{
// http://msmvps.com/blogs/jon_skeet/archive/2010/11/02/evil-code-overload-resolution-workaround.aspx
var container = compilation.FindType(typeof(SkeetEvilOverloadResolutionTestCase)).GetDefinition();
IMethod resolvedM1 = container.GetMethods(m => m.Name == "Foo").First();
IMethod resolvedM2 = container.GetMethods(m => m.Name == "Foo").Skip(1).First();
IMethod resolvedM3 = container.GetMethods(m => m.Name == "Foo").Skip(2).First();
// Call: Foo<int>();
OverloadResolution o;
o = new OverloadResolution(compilation, new ResolveResult[0], typeArguments: new[] { compilation.FindType(typeof(int)) });
Assert.AreEqual(OverloadResolutionErrors.None, o.AddCandidate(resolvedM1));
Assert.AreEqual(OverloadResolutionErrors.ConstructedTypeDoesNotSatisfyConstraint, o.AddCandidate(resolvedM2));
Assert.AreSame(resolvedM1, o.BestCandidate);
// Call: Foo<string>();
o = new OverloadResolution(compilation, new ResolveResult[0], typeArguments: new[] { compilation.FindType(typeof(string)) });
Assert.AreEqual(OverloadResolutionErrors.ConstructedTypeDoesNotSatisfyConstraint, o.AddCandidate(resolvedM1));
Assert.AreEqual(OverloadResolutionErrors.None, o.AddCandidate(resolvedM2));
Assert.AreSame(resolvedM2, o.BestCandidate);
// Call: Foo<int?>();
o = new OverloadResolution(compilation, new ResolveResult[0], typeArguments: new[] { compilation.FindType(typeof(int?)) });
Assert.AreEqual(OverloadResolutionErrors.ConstructedTypeDoesNotSatisfyConstraint, o.AddCandidate(resolvedM1));
Assert.AreEqual(OverloadResolutionErrors.ConstructedTypeDoesNotSatisfyConstraint, o.AddCandidate(resolvedM2));
Assert.AreEqual(OverloadResolutionErrors.None, o.AddCandidate(resolvedM3));
Assert.AreSame(resolvedM3, o.BestCandidate);
}
public OverloadResolution PerformOverloadResolution(ICompilation compilation, Expression[] arguments, string[] argumentNames = null,
bool allowExtensionMethods = true,
bool allowExpandingParams = true,
bool allowOptionalParameters = true,
bool checkForOverflow = false, VSharpConversions conversions = null)
{
var typeArgumentArray = this.TypeArguments.ToArray();
OverloadResolution or = new OverloadResolution(compilation, arguments, argumentNames, typeArgumentArray, conversions);
or.AllowExpandingParams = allowExpandingParams;
or.AllowOptionalParameters = allowOptionalParameters;
or.CheckForOverflow = checkForOverflow;
or.AddMethodLists(methodLists);
if (allowExtensionMethods && !or.FoundApplicableCandidate)
{
// No applicable match found, so let's try extension methods.
var extensionMethods = this.GetExtensionMethods();
if (extensionMethods.Any())
{
Expression[] extArguments = new Expression[arguments.Length + 1];
extArguments[0] = new AST.Expression(this.TargetType);
arguments.CopyTo(extArguments, 1);
string[] extArgumentNames = null;
if (argumentNames != null)
{
extArgumentNames = new string[argumentNames.Length + 1];
argumentNames.CopyTo(extArgumentNames, 1);
}
var extOr = new OverloadResolution(compilation, extArguments, extArgumentNames, typeArgumentArray, conversions);
extOr.AllowExpandingParams = allowExpandingParams;
extOr.AllowOptionalParameters = allowOptionalParameters;
extOr.IsExtensionMethodInvocation = true;
extOr.CheckForOverflow = checkForOverflow;
foreach (var g in extensionMethods)
{
foreach (var method in g)
extOr.AddCandidate(method);
if (extOr.FoundApplicableCandidate)
break;
}
// For the lack of a better comparison function (the one within OverloadResolution
// cannot be used as it depends on the argument set):
if (extOr.FoundApplicableCandidate || or.BestCandidate == null)
{
// Consider an extension method result better than the normal result only
// if it's applicable; or if there is no normal result.
or = extOr;
}
}
}
return or;
}
public void CallInvalidParamsDeclaration()
{
OverloadResolution r = new OverloadResolution(compilation, MakeArgumentList(typeof(int[, ])));
Assert.AreEqual(OverloadResolutionErrors.ArgumentTypeMismatch, r.AddCandidate(MakeParamsMethod(typeof(int))));
Assert.IsFalse(r.BestCandidateIsExpandedForm);
}
public void ParamsMethodMatchesInUnexpandedForm()
{
OverloadResolution r = new OverloadResolution(compilation, MakeArgumentList(typeof(int[])));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(MakeParamsMethod(typeof(int[]))));
Assert.IsFalse(r.BestCandidateIsExpandedForm);
}
OverloadResolutionErrors IsUnambiguousCall(ExpectedTargetDetails expectedTargetDetails, IMethod method,
TranslatedExpression target, IType[] typeArguments, IList <TranslatedExpression> arguments)
{
var lookup = new MemberLookup(resolver.CurrentTypeDefinition, resolver.CurrentTypeDefinition.ParentAssembly);
var or = new OverloadResolution(resolver.Compilation, arguments.SelectArray(a => a.ResolveResult), typeArguments: typeArguments);
if (expectedTargetDetails.CallOpCode == OpCode.NewObj)
{
foreach (IMethod ctor in method.DeclaringType.GetConstructors())
{
if (lookup.IsAccessible(ctor, allowProtectedAccess: resolver.CurrentTypeDefinition == method.DeclaringTypeDefinition))
{
or.AddCandidate(ctor);
}
}
}
else
{
var result = lookup.Lookup(target.ResolveResult, method.Name, EmptyList <IType> .Instance, true) as MethodGroupResolveResult;
if (result == null)
{
return(OverloadResolutionErrors.AmbiguousMatch);
}
or.AddMethodLists(result.MethodsGroupedByDeclaringType.ToArray());
}
if (or.BestCandidateErrors != OverloadResolutionErrors.None)
{
return(or.BestCandidateErrors);
}
if (!IsAppropriateCallTarget(expectedTargetDetails, method, or.GetBestCandidateWithSubstitutedTypeArguments()))
{
return(OverloadResolutionErrors.AmbiguousMatch);
}
return(OverloadResolutionErrors.None);
}
public void Lambda_DelegateAndExpressionTreeOverloadsAreAmbiguous()
{
var m1 = MakeMethod(typeof(Func <int>));
var m2 = MakeMethod(typeof(Expression <Func <int> >));
// M(() => default(int));
ResolveResult[] args =
{
new MockLambda(compilation.FindType(KnownTypeCode.Int32))
};
OverloadResolution r = new OverloadResolution(compilation, args);
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(m1));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(m2));
Assert.AreEqual(OverloadResolutionErrors.AmbiguousMatch, r.BestCandidateErrors);
}
public void BetterConversionByLambdaReturnValue_ExpressionTree()
{
var m1 = MakeMethod(typeof(Func <long>));
var m2 = MakeMethod(typeof(Expression <Func <int> >));
// M(() => default(byte));
ResolveResult[] args =
{
new MockLambda(compilation.FindType(KnownTypeCode.Byte))
};
OverloadResolution r = new OverloadResolution(compilation, args);
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(m1));
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(m2));
Assert.AreSame(m2, r.BestCandidate);
Assert.AreEqual(OverloadResolutionErrors.None, r.BestCandidateErrors);
}
bool BaseTypeHasUsableParameterlessConstructor()
{
var memberLookup = new MemberLookup(currentType.GetDefinition(), ctx.Compilation.MainAssembly);
OverloadResolution or = new OverloadResolution(ctx.Compilation, new ResolveResult[0]);
foreach (var ctor in baseType.GetConstructors())
{
if (memberLookup.IsAccessible(ctor, allowProtectedAccess: true))
{
if (or.AddCandidate(ctor) == OverloadResolutionErrors.None)
{
return(true);
}
}
}
return(false);
}
protected virtual void WritePositionalList(IList <ResolveResult> expressions, IAttribute attr)
{
bool needComma = false;
int count = Emitter.Writers.Count;
bool expanded = false;
int paramsIndex = -1;
if (attr.Constructor.Parameters.Any(p => p.IsParams))
{
paramsIndex = attr.Constructor.Parameters.IndexOf(attr.Constructor.Parameters.FirstOrDefault(p => p.IsParams));
var or = new OverloadResolution(Emitter.Resolver.Compilation, expressions.ToArray());
or.AddCandidate(attr.Constructor);
expanded = or.BestCandidateIsExpandedForm;
}
for (int i = 0; i < expressions.Count; i++)
{
var expr = expressions[i];
if (needComma)
{
WriteComma();
}
needComma = true;
if (expanded && paramsIndex == i)
{
WriteOpenBracket();
}
WriteResolveResult(expr, this);
if (Emitter.Writers.Count != count)
{
PopWriter();
count = Emitter.Writers.Count;
}
}
if (expanded)
{
WriteCloseBracket();
}
}
public void BetterFunctionMemberIsNotTransitive()
{
var container = compilation.FindType(typeof(BetterFunctionMemberIsNotTransitiveTestCase)).GetDefinition();
var args = new ResolveResult[] {
new MockLambda(compilation.FindType(KnownTypeCode.String))
{
parameters = { new DefaultParameter(SpecialType.UnknownType, "arg") }
}
};
OverloadResolution r = new OverloadResolution(compilation, args);
foreach (var method in container.GetMethods(m => m.Name == "Method"))
{
Assert.AreEqual(OverloadResolutionErrors.None, r.AddCandidate(method));
}
Assert.AreEqual(container.GetMethods(m => m.Name == "Method").Last(), r.BestCandidate);
}
public Expression ResolveBinaryOperator(ResolveContext rc, BinaryOperatorType op, Expression lhs, Expression rhs)
{
// V# 4.0 spec: §7.3.4 Binary operator overload resolution
string overloadableOperatorName = ResolveContext.GetOverloadableOperatorName(op);
if (overloadableOperatorName == null)
{
// Handle logical and/or exactly as bitwise and/or:
// - If the user overloads a bitwise operator, that implicitly creates the corresponding logical operator.
// - If both inputs are compile-time constants, it doesn't matter that we don't short-circuit.
// - If inputs aren't compile-time constants, we don't evaluate anything, so again it doesn't matter that we don't short-circuit
if (op == BinaryOperatorType.LogicalAnd)
{
overloadableOperatorName = ResolveContext.GetOverloadableOperatorName(BinaryOperatorType.BitwiseAnd);
}
else if (op == BinaryOperatorType.LogicalOr)
{
overloadableOperatorName = ResolveContext.GetOverloadableOperatorName(BinaryOperatorType.BitwiseOr);
}
else if (op == BinaryOperatorType.NullCoalescing)
{
// null coalescing operator is not overloadable and needs to be handled separately
return(ResolveNullCoalescingOperator(rc, lhs, rhs));
}
else
{
return(ErrorExpression.UnknownError);
}
}
// If the type is nullable, get the underlying type:
bool isNullable = NullableType.IsNullable(lhs.Type) || NullableType.IsNullable(rhs.Type);
IType lhsType = NullableType.GetUnderlyingType(lhs.Type);
IType rhsType = NullableType.GetUnderlyingType(rhs.Type);
// the operator is overloadable:
OverloadResolution userDefinedOperatorOR = rc.CreateOverloadResolution(new[] { lhs, rhs });
HashSet <IParameterizedMember> userOperatorCandidates = new HashSet <IParameterizedMember>();
userOperatorCandidates.UnionWith(rc.GetUserDefinedOperatorCandidates(lhsType, overloadableOperatorName));
userOperatorCandidates.UnionWith(rc.GetUserDefinedOperatorCandidates(rhsType, overloadableOperatorName));
foreach (var candidate in userOperatorCandidates)
{
userDefinedOperatorOR.AddCandidate(candidate);
}
if (userDefinedOperatorOR.FoundApplicableCandidate)
{
return(SetUserDefinedOperationInformations(rc, userDefinedOperatorOR));
}
if (lhsType.Kind == TypeKind.Null && rhsType.IsReferenceType == false ||
lhsType.IsReferenceType == false && rhsType.Kind == TypeKind.Null)
{
isNullable = true;
}
if (op == BinaryOperatorType.LeftShift || op == BinaryOperatorType.RightShift)
{
// special case: the shift operators allow "var x = null << null", producing int?.
if (lhsType.Kind == TypeKind.Null && rhsType.Kind == TypeKind.Null)
{
isNullable = true;
}
// for shift operators, do unary promotion independently on both arguments
lhs = UnaryNumericPromotion(rc, UnaryOperatorType.UnaryPlus, ref lhsType, isNullable, lhs);
rhs = UnaryNumericPromotion(rc, UnaryOperatorType.UnaryPlus, ref rhsType, isNullable, rhs);
}
else
{
bool allowNullableConstants = op == BinaryOperatorType.Equality || op == BinaryOperatorType.Inequality;
if (!BinaryNumericPromotion(rc, isNullable, ref lhs, ref rhs, allowNullableConstants))
{
return(new ErrorExpression(lhs.Type));
}
}
// re-read underlying types after numeric promotion
lhsType = NullableType.GetUnderlyingType(lhs.Type);
rhsType = NullableType.GetUnderlyingType(rhs.Type);
IEnumerable <VSharpOperators.OperatorMethod> methodGroup;
VSharpOperators operators = VSharpOperators.Get(rc.compilation);
switch (op)
{
case BinaryOperatorType.Multiply:
methodGroup = operators.MultiplicationOperators;
break;
case BinaryOperatorType.Division:
methodGroup = operators.DivisionOperators;
break;
case BinaryOperatorType.Modulus:
methodGroup = operators.RemainderOperators;
break;
case BinaryOperatorType.Addition:
methodGroup = operators.AdditionOperators;
{
if (lhsType.Kind == TypeKind.Enum)
{
// E operator +(E x, U y);
IType underlyingType = MakeNullable(rc, ResolveContext.GetEnumUnderlyingType(lhsType), isNullable);
if (rc.TryConvertEnum(ref rhs, underlyingType, ref isNullable, ref lhs))
{
return(HandleEnumOperator(rc, isNullable, lhsType, op, lhs, rhs));
}
}
if (rhsType.Kind == TypeKind.Enum)
{
// E operator +(U x, E y);
IType underlyingType = MakeNullable(rc, ResolveContext.GetEnumUnderlyingType(rhsType), isNullable);
if (rc.TryConvertEnum(ref lhs, underlyingType, ref isNullable, ref rhs))
{
return(HandleEnumOperator(rc, isNullable, rhsType, op, lhs, rhs));
}
}
if (lhsType.Kind == TypeKind.Delegate && rc.TryConvert(ref rhs, lhsType))
{
return(SetOperationInformations(rc, lhsType, lhs, op, rhs));
}
else if (rhsType.Kind == TypeKind.Delegate && rc.TryConvert(ref lhs, rhsType))
{
return(SetOperationInformations(rc, rhsType, lhs, op, rhs));
}
if (lhsType is PointerTypeSpec)
{
methodGroup = new[] {
PointerArithmeticOperator(rc, lhsType, lhsType, KnownTypeCode.Int32),
PointerArithmeticOperator(rc, lhsType, lhsType, KnownTypeCode.UInt32),
PointerArithmeticOperator(rc, lhsType, lhsType, KnownTypeCode.Int64),
PointerArithmeticOperator(rc, lhsType, lhsType, KnownTypeCode.UInt64)
};
}
else if (rhsType is PointerTypeSpec)
{
methodGroup = new[] {
PointerArithmeticOperator(rc, rhsType, KnownTypeCode.Int32, rhsType),
PointerArithmeticOperator(rc, rhsType, KnownTypeCode.UInt32, rhsType),
PointerArithmeticOperator(rc, rhsType, KnownTypeCode.Int64, rhsType),
PointerArithmeticOperator(rc, rhsType, KnownTypeCode.UInt64, rhsType)
};
}
if (lhsType.Kind == TypeKind.Null && rhsType.Kind == TypeKind.Null)
{
return(new ErrorExpression(SpecialTypeSpec.NullType));
}
}
break;
case BinaryOperatorType.Subtraction:
methodGroup = operators.SubtractionOperators;
{
if (lhsType.Kind == TypeKind.Enum)
{
// U operator –(E x, E y);
if (rc.TryConvertEnum(ref rhs, lhs.Type, ref isNullable, ref lhs, allowConversionFromConstantZero: false))
{
return(HandleEnumSubtraction(rc, isNullable, lhsType, lhs, rhs));
}
// E operator –(E x, U y);
IType underlyingType = MakeNullable(rc, ResolveContext.GetEnumUnderlyingType(lhsType), isNullable);
if (rc.TryConvertEnum(ref rhs, underlyingType, ref isNullable, ref lhs))
{
return(HandleEnumOperator(rc, isNullable, lhsType, op, lhs, rhs));
}
}
if (rhsType.Kind == TypeKind.Enum)
{
// U operator –(E x, E y);
if (rc.TryConvertEnum(ref lhs, rhs.Type, ref isNullable, ref rhs, allowConversionFromConstantZero: false))
{
return(HandleEnumSubtraction(rc, isNullable, rhsType, lhs, rhs));
}
// E operator -(U x, E y);
IType underlyingType = MakeNullable(rc, ResolveContext.GetEnumUnderlyingType(rhsType), isNullable);
if (rc.TryConvertEnum(ref lhs, underlyingType, ref isNullable, ref rhs))
{
return(HandleEnumOperator(rc, isNullable, rhsType, op, lhs, rhs));
}
}
if (lhsType.Kind == TypeKind.Delegate && rc.TryConvert(ref rhs, lhsType))
{
return(SetOperationInformations(rc, lhsType, lhs, op, rhs));
}
else if (rhsType.Kind == TypeKind.Delegate && rc.TryConvert(ref lhs, rhsType))
{
return(SetOperationInformations(rc, rhsType, lhs, op, rhs));
}
if (lhsType is PointerTypeSpec)
{
if (rhsType is PointerTypeSpec)
{
IType int64 = rc.compilation.FindType(KnownTypeCode.Int64);
if (lhsType.Equals(rhsType))
{
return(SetOperationInformations(rc, int64, lhs, op, rhs));
}
else
{
return(new ErrorExpression(int64));
}
}
methodGroup = new[] {
PointerArithmeticOperator(rc, lhsType, lhsType, KnownTypeCode.Int32),
PointerArithmeticOperator(rc, lhsType, lhsType, KnownTypeCode.UInt32),
PointerArithmeticOperator(rc, lhsType, lhsType, KnownTypeCode.Int64),
PointerArithmeticOperator(rc, lhsType, lhsType, KnownTypeCode.UInt64)
};
}
if (lhsType.Kind == TypeKind.Null && rhsType.Kind == TypeKind.Null)
{
return(new ErrorExpression(SpecialTypeSpec.NullType));
}
}
break;
case BinaryOperatorType.LeftShift:
methodGroup = operators.ShiftLeftOperators;
break;
case BinaryOperatorType.RightShift:
methodGroup = operators.ShiftRightOperators;
break;
case BinaryOperatorType.RotateRight:
methodGroup = operators.RotateRightOperators;
break;
case BinaryOperatorType.RotateLeft:
methodGroup = operators.RotateLeftOperators;
break;
case BinaryOperatorType.Equality:
case BinaryOperatorType.Inequality:
case BinaryOperatorType.LessThan:
case BinaryOperatorType.GreaterThan:
case BinaryOperatorType.LessThanOrEqual:
case BinaryOperatorType.GreaterThanOrEqual:
{
if (lhsType.Kind == TypeKind.Enum && rc.TryConvert(ref rhs, lhs.Type))
{
// bool operator op(E x, E y);
return(HandleEnumComparison(rc, op, lhsType, isNullable, lhs, rhs));
}
else if (rhsType.Kind == TypeKind.Enum && rc.TryConvert(ref lhs, rhs.Type))
{
// bool operator op(E x, E y);
return(HandleEnumComparison(rc, op, rhsType, isNullable, lhs, rhs));
}
else if (lhsType is PointerTypeSpec && rhsType is PointerTypeSpec)
{
return(SetOperationInformations(rc, rc.compilation.FindType(KnownTypeCode.Boolean), lhs, op, rhs));
}
if (op == BinaryOperatorType.Equality || op == BinaryOperatorType.Inequality)
{
if (lhsType.IsReferenceType == true && rhsType.IsReferenceType == true)
{
// If it's a reference comparison
if (op == BinaryOperatorType.Equality)
{
methodGroup = operators.ReferenceEqualityOperators;
}
else
{
methodGroup = operators.ReferenceInequalityOperators;
}
break;
}
else if (lhsType.Kind == TypeKind.Null && IsNullableTypeOrNonValueType(rhs.Type) ||
IsNullableTypeOrNonValueType(lhs.Type) && rhsType.Kind == TypeKind.Null)
{
// compare type parameter or nullable type with the null literal
return(SetOperationInformations(rc, rc.compilation.FindType(KnownTypeCode.Boolean), lhs, op, rhs));
}
}
switch (op)
{
case BinaryOperatorType.Equality:
methodGroup = operators.ValueEqualityOperators;
break;
case BinaryOperatorType.Inequality:
methodGroup = operators.ValueInequalityOperators;
break;
case BinaryOperatorType.LessThan:
methodGroup = operators.LessThanOperators;
break;
case BinaryOperatorType.GreaterThan:
methodGroup = operators.GreaterThanOperators;
break;
case BinaryOperatorType.LessThanOrEqual:
methodGroup = operators.LessThanOrEqualOperators;
break;
case BinaryOperatorType.GreaterThanOrEqual:
methodGroup = operators.GreaterThanOrEqualOperators;
break;
default:
throw new InvalidOperationException();
}
}
break;
case BinaryOperatorType.BitwiseAnd:
case BinaryOperatorType.BitwiseOr:
case BinaryOperatorType.ExclusiveOr:
{
if (lhsType.Kind == TypeKind.Enum)
{
// bool operator op(E x, E y);
if (rc.TryConvertEnum(ref rhs, lhs.Type, ref isNullable, ref lhs))
{
return(HandleEnumOperator(rc, isNullable, lhsType, op, lhs, rhs));
}
}
if (rhsType.Kind == TypeKind.Enum)
{
// bool operator op(E x, E y);
if (rc.TryConvertEnum(ref lhs, rhs.Type, ref isNullable, ref rhs))
{
return(HandleEnumOperator(rc, isNullable, rhsType, op, lhs, rhs));
}
}
switch (op)
{
case BinaryOperatorType.BitwiseAnd:
methodGroup = operators.BitwiseAndOperators;
break;
case BinaryOperatorType.BitwiseOr:
methodGroup = operators.BitwiseOrOperators;
break;
case BinaryOperatorType.ExclusiveOr:
methodGroup = operators.BitwiseXorOperators;
break;
default:
throw new InvalidOperationException();
}
}
break;
case BinaryOperatorType.LogicalAnd:
methodGroup = operators.LogicalAndOperators;
break;
case BinaryOperatorType.LogicalOr:
methodGroup = operators.LogicalOrOperators;
break;
default:
throw new InvalidOperationException();
}
OverloadResolution builtinOperatorOR = rc.CreateOverloadResolution(new[] { lhs, rhs });
foreach (var candidate in methodGroup)
{
builtinOperatorOR.AddCandidate(candidate);
}
VSharpOperators.BinaryOperatorMethod m = (VSharpOperators.BinaryOperatorMethod)builtinOperatorOR.BestCandidate;
IType resultType = m.ReturnType;
if (builtinOperatorOR.BestCandidateErrors != OverloadResolutionErrors.None)
{
// If there are any user-defined operators, prefer those over the built-in operators.
// It'll be a more informative error.
if (userDefinedOperatorOR.BestCandidate != null)
{
return(SetUserDefinedOperationInformations(rc, userDefinedOperatorOR));
}
else
{
return(new ErrorExpression(resultType));
}
}
else if (lhs.IsCompileTimeConstant && rhs.IsCompileTimeConstant && m.CanEvaluateAtCompileTime)
{
object val;
try
{
val = m.Invoke(rc, lhs.ConstantValue, rhs.ConstantValue);
}
catch (ArithmeticException)
{
return(new ErrorExpression(resultType));
}
return(Constant.CreateConstantFromValue(rc, resultType, val, loc));
}
else
{
lhs = rc.Convert(lhs, m.Parameters[0].Type, builtinOperatorOR.ArgumentConversions[0]);
rhs = rc.Convert(rhs, m.Parameters[1].Type, builtinOperatorOR.ArgumentConversions[1]);
return(SetOperationInformations(rc, resultType, lhs, op, rhs,
builtinOperatorOR.BestCandidate is OverloadResolution.ILiftedOperator));
}
}
/// <summary>
/// Resolves an invocation.
/// </summary>
/// <param name="target">The target of the invocation. Usually a MethodGroupResolveResult.</param>
/// <param name="arguments">
/// Arguments passed to the method.
/// The resolver may mutate this array to wrap elements in <see cref="ConversionResolveResult"/>s!
/// </param>
/// <param name="argumentNames">
/// The argument names. Pass the null string for positional arguments.
/// </param>
/// <returns>InvocationExpression</returns>
private Expression ResolveInvocation(ResolveContext rc, Expression target, Expression[] arguments, string[] argumentNames, bool allowOptionalParameters)
{
// C# 4.0 spec: §7.6.5
MethodGroupExpression mgrr = target as MethodGroupExpression;
if (mgrr != null)
{
OverloadResolution or = mgrr.PerformOverloadResolution(rc.compilation, arguments, argumentNames, checkForOverflow: rc.checkForOverflow, conversions: rc.conversions, allowOptionalParameters: allowOptionalParameters);
if (or.BestCandidate != null)
{
var m = or.BestCandidate;
if (arguments == null && m.Name == DestructorDeclaration.MetadataName)
{
rc.Report.Error(0, loc, "Destructors cannot be called directly. Consider calling IDisposable.Dispose if available");
}
CheckSpecialMethod(rc, m);
if (or.BestCandidate.IsStatic && !or.IsExtensionMethodInvocation && !(mgrr.TargetResult is TypeExpression))
{
return(or.CreateInvocation(new TypeExpression(mgrr.TargetType), returnTypeOverride: null));
}
else
{
return(or.CreateInvocation(mgrr.TargetResult, returnTypeOverride: null));
}
}
else
{
// No candidate found at all (not even an inapplicable one).
// This can happen with empty method groups (as sometimes used with extension methods)
rc.Report.Error(0, loc, "`{0}' does not contain a definition for `{1}'",
mgrr.TargetType.ToString(), mgrr.MethodName);
return(null);
}
}
if (target == null && expr is SimpleName)
{
rc.Report.Error(0, loc, "`{0}' does not contain a definition for `{1}'",
rc.CurrentTypeDefinition.ToString(), expr.GetSignatureForError());
return(null);
}
else if (target == null)
{
return(null);
}
IMethod invokeMethod = target.Type.GetDelegateInvokeMethod();
if (invokeMethod != null)
{
// is it a delegate ?
if (target.Type.Kind != TypeKind.Delegate)
{
rc.Report.Error(0, loc, "Cannot invoke a non-delegate type `{0}'",
target.Type.ToString());
return(null);
}
OverloadResolution or = rc.CreateOverloadResolution(arguments, argumentNames);
or.AddCandidate(invokeMethod);
return(new Invocation(
target, invokeMethod, //invokeMethod.ReturnType.Resolve(context),
or.GetArgumentsWithConversionsAndNames(), or.BestCandidateErrors,
isExpandedForm: or.BestCandidateIsExpandedForm,
isDelegateInvocation: true,
argumentToParameterMap: or.GetArgumentToParameterMap(),
returnTypeOverride: null));
}
rc.Report.Error(0, loc, "The member `{0}' cannot be used as method or delegate",
target.GetSignatureForError());
return(ErrorResult);
}
public Expression ResolveUnaryOperator(ResolveContext rc, UnaryOperatorType op, Expression expression)
{
// V# 4.0 spec: §7.3.3 Unary operator overload resolution
string overloadableOperatorName = GetOverloadableOperatorName(op);
if (overloadableOperatorName == null)
{
switch (op)
{
case UnaryOperatorType.Dereference:
PointerTypeSpec p = expression.Type as PointerTypeSpec;
if (p != null)
{
return(SetOperationInformations(rc, p.ElementType, op, expression));
}
else
{
return(ErrorResult);
}
case UnaryOperatorType.AddressOf:
return(SetOperationInformations(rc, new PointerTypeSpec(expression.Type), op, expression));
default:
return(ErrorExpression.UnknownError);
}
}
// If the type is nullable, get the underlying type:
IType type = NullableType.GetUnderlyingType(expression.Type);
bool isNullable = NullableType.IsNullable(expression.Type);
// the operator is overloadable:
OverloadResolution userDefinedOperatorOR = rc.CreateOverloadResolution(new[] { expression });
foreach (var candidate in rc.GetUserDefinedOperatorCandidates(type, overloadableOperatorName))
{
userDefinedOperatorOR.AddCandidate(candidate);
}
if (userDefinedOperatorOR.FoundApplicableCandidate)
{
return(SetUserDefinedOperationInformations(rc, userDefinedOperatorOR));
}
expression = UnaryNumericPromotion(rc, op, ref type, isNullable, expression);
VSharpOperators.OperatorMethod[] methodGroup;
VSharpOperators operators = VSharpOperators.Get(rc.compilation);
switch (op)
{
case UnaryOperatorType.PreIncrement:
case UnaryOperatorType.Decrement:
case UnaryOperatorType.PostIncrement:
case UnaryOperatorType.PostDecrement:
// V# 4.0 spec: §7.6.9 Postfix increment and decrement operators
// V# 4.0 spec: §7.7.5 Prefix increment and decrement operators
TypeCode code = ReflectionHelper.GetTypeCode(type);
if ((code >= TypeCode.Char && code <= TypeCode.Decimal) || type.Kind == TypeKind.Enum || type.Kind == TypeKind.Pointer)
{
return(SetOperationInformations(rc, expression.Type, op, expression, isNullable));
}
else
{
return(new ErrorExpression(expression.Type));
}
case UnaryOperatorType.UnaryPlus:
methodGroup = operators.UnaryPlusOperators;
break;
case UnaryOperatorType.UnaryNegation:
methodGroup = rc.checkForOverflow ? operators.CheckedUnaryMinusOperators : operators.UncheckedUnaryMinusOperators;
break;
case UnaryOperatorType.LogicalNot:
methodGroup = operators.LogicalNegationOperators;
break;
case UnaryOperatorType.OnesComplement:
if (type.Kind == TypeKind.Enum)
{
if (expression.IsCompileTimeConstant && !isNullable && expression.ConstantValue != null)
{
// evaluate as (E)(~(U)x);
var U = rc.compilation.FindType(expression.ConstantValue.GetType());
var unpackedEnum = Constant.CreateConstantFromValue(rc, U, expression.ConstantValue, loc);
var rr = ResolveUnaryOperator(rc, op, unpackedEnum);
ResolveContext ovfrc = rc.WithCheckForOverflow(false);
rr = new CastExpression(type, rr).DoResolve(ovfrc);
if (rr.IsCompileTimeConstant)
{
return(rr);
}
}
return(SetOperationInformations(rc, expression.Type, op, expression, isNullable));
}
else
{
methodGroup = operators.BitwiseComplementOperators;
break;
}
default:
throw new InvalidOperationException();
}
OverloadResolution builtinOperatorOR = rc.CreateOverloadResolution(new[] { expression });
foreach (var candidate in methodGroup)
{
builtinOperatorOR.AddCandidate(candidate);
}
VSharpOperators.UnaryOperatorMethod m = (VSharpOperators.UnaryOperatorMethod)builtinOperatorOR.BestCandidate;
IType resultType = m.ReturnType;
if (builtinOperatorOR.BestCandidateErrors != OverloadResolutionErrors.None)
{
if (userDefinedOperatorOR.BestCandidate != null)
{
// If there are any user-defined operators, prefer those over the built-in operators.
// It'll be a more informative error.
return(SetUserDefinedOperationInformations(rc, userDefinedOperatorOR));
}
else if (builtinOperatorOR.BestCandidateAmbiguousWith != null)
{
// If the best candidate is ambiguous, just use the input type instead
// of picking one of the ambiguous overloads.
return(new ErrorExpression(expression.Type));
}
else
{
return(new ErrorExpression(resultType));
}
}
else if (expression.IsCompileTimeConstant && m.CanEvaluateAtCompileTime)
{
object val;
try
{
val = m.Invoke(rc, expression.ConstantValue);
}
catch (ArithmeticException)
{
return(new ErrorExpression(resultType));
}
return(Constant.CreateConstantFromValue(rc, resultType, val, loc));
}
else
{
expression = rc.Convert(expression, m.Parameters[0].Type, builtinOperatorOR.ArgumentConversions[0]);
return(SetOperationInformations(rc, resultType, op, expression,
builtinOperatorOR.BestCandidate is OverloadResolution.ILiftedOperator));
}
}
