MyEmptyExpr = new EmptyExpression ();
MyEmptyExpr.SetType (TypeManager.GetElementType (array));
- return ImplicitReferenceConversionExists (MyEmptyExpr, arg_type);
+ return ImplicitReferenceConversionCore (MyEmptyExpr, arg_type);
#else
return false;
#endif
return null;
}
+ static bool ImplicitTypeParameterBoxingConversion (Type expr_type, Type target_type,
+ out bool use_class_cast)
+ {
+#if GMCS_SOURCE
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (expr_type);
+
+ if (gc == null) {
+ use_class_cast = false;
+ return target_type == TypeManager.object_type;
+ }
+
+ use_class_cast = true;
+
+ if (!gc.HasReferenceTypeConstraint)
+ return false;
+
+ // We're converting from a type parameter which is known to be a reference type.
+ Type base_type = TypeParam_EffectiveBaseType (gc);
+
+ if (TypeManager.IsSubclassOf (base_type, target_type))
+ return true;
+
+ if (target_type.IsInterface) {
+ if (TypeManager.ImplementsInterface (base_type, target_type))
+ return true;
+
+ foreach (Type t in gc.InterfaceConstraints) {
+ if (TypeManager.IsSubclassOf (t, target_type))
+ return true;
+ if (TypeManager.ImplementsInterface (t, target_type))
+ return true;
+ }
+ }
+
+ foreach (Type t in gc.InterfaceConstraints) {
+ if (!TypeManager.IsGenericParameter (t))
+ continue;
+ if (TypeManager.IsSubclassOf (t, target_type))
+ return true;
+ if (TypeManager.ImplementsInterface (t, target_type))
+ return true;
+ }
+#endif
+
+ use_class_cast = false;
+ return false;
+ }
+
static bool ExplicitTypeParameterConversionExists (Type source_type, Type target_type)
{
#if GMCS_SOURCE
if (TypeManager.IsGenericParameter (expr_type))
return ImplicitTypeParameterConversion (expr, target_type);
+ // from the null type to any reference-type.
+ if (expr_type == TypeManager.null_type) {
+ NullConstant nc = (NullConstant)expr;
+ return nc.ConvertImplicitly(target_type);
+ }
+
+ if (ImplicitReferenceConversionCore (expr, target_type))
+ return EmptyCast.Create (expr, target_type);
+
+ bool use_class_cast;
+ if (ImplicitBoxingConversionExists (expr, target_type, out use_class_cast)) {
+ if (use_class_cast)
+ return new ClassCast (expr, target_type);
+ else
+ return new BoxedCast (expr, target_type);
+ }
+
+ return null;
+ }
+
+ static public bool ImplicitReferenceConversionCore (Expression expr, Type target_type)
+ {
+ Type expr_type = expr.Type;
+
//
// notice that it is possible to write "ValueType v = 1", the ValueType here
// is an abstract class, and not really a value type, so we apply the same rules.
// A pointer type cannot be converted to object
//
if (expr_type.IsPointer)
- return null;
+ return false;
if (TypeManager.IsValueType (expr_type))
- return new BoxedCast (expr, target_type);
+ return false;
if (expr_type.IsClass || expr_type.IsInterface || expr_type == TypeManager.enum_type){
- if (expr_type == TypeManager.anonymous_method_type)
- return null;
- return new EmptyCast (expr, target_type);
+ return expr_type != TypeManager.anonymous_method_type;
}
- return null;
+ return false;
} else if (target_type == TypeManager.value_type) {
- if (TypeManager.IsValueType (expr_type))
- return new BoxedCast (expr, target_type);
- if (expr_type == TypeManager.null_type)
- return new EmptyConstantCast ((Constant)expr, target_type);
-
- return null;
+ return expr_type == TypeManager.enum_type;
} else if (TypeManager.IsSubclassOf (expr_type, target_type)) {
//
// Special case: enumeration to System.Enum.
// a boxing conversion
//
if (expr_type.IsEnum || TypeManager.IsGenericParameter (expr_type))
- return new BoxedCast (expr, target_type);
+ return false;
- return new EmptyCast (expr, target_type);
+ return true;
}
// This code is kind of mirrored inside ImplicitStandardConversionExists
//
// Always ensure that the code here and there is in sync
- // from the null type to any reference-type.
- if (expr_type == TypeManager.null_type) {
- NullConstant nc = (NullConstant)expr;
- return nc.ConvertImplicitly(target_type);
- }
-
// from any class-type S to any interface-type T.
if (target_type.IsInterface) {
if (target_type != TypeManager.iconvertible_type &&
expr is LongLiteral || expr is CharLiteral ||
expr is StringLiteral || expr is DecimalLiteral ||
expr is UIntLiteral || expr is ULongLiteral)) {
- return null;
+ return false;
}
if (TypeManager.ImplementsInterface (expr_type, target_type)){
- if (TypeManager.IsGenericParameter (expr_type) || TypeManager.IsValueType (expr_type))
- return new BoxedCast (expr, target_type);
- else
- return new EmptyCast (expr, target_type);
+ return !TypeManager.IsGenericParameter (expr_type) &&
+ !TypeManager.IsValueType (expr_type);
}
}
// from any interface type S to interface-type T.
if (expr_type.IsInterface && target_type.IsInterface) {
- if (TypeManager.ImplementsInterface (expr_type, target_type))
- return new EmptyCast (expr, target_type);
- else
- return null;
+ return TypeManager.ImplementsInterface (expr_type, target_type);
}
// from an array-type S to an array-type of type T
Type target_element_type = TypeManager.GetElementType (target_type);
if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
- if (ImplicitStandardConversionExists (MyEmptyExpr,
- target_element_type))
- return new EmptyCast (expr, target_type);
+ return ImplicitStandardConversionExists (
+ MyEmptyExpr, target_element_type);
}
}
// from an array-type to System.Array
if (expr_type.IsArray && target_type == TypeManager.array_type)
- return new EmptyCast (expr, target_type);
+ return true;
// from an array-type of type T to IList<T>
if (expr_type.IsArray && Array_To_IList (expr_type, target_type))
- return new EmptyCast (expr, target_type);
+ return true;
// from any delegate type to System.Delegate
if ((expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type)) &&
target_type == TypeManager.delegate_type)
- return new EmptyCast (expr, target_type);
+ return true;
// from any array-type or delegate type into System.ICloneable.
if (expr_type.IsArray ||
expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type))
if (target_type == TypeManager.icloneable_type)
- return new EmptyCast (expr, target_type);
+ return true;
// from a generic type definition to a generic instance.
if (TypeManager.IsEqual (expr_type, target_type))
- return new EmptyCast (expr, target_type);
+ return true;
- return null;
+ return false;
}
- //
- // Tests whether an implicit reference conversion exists between expr_type
- // and target_type
- //
- public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
+ static public bool ImplicitBoxingConversionExists (Expression expr, Type target_type,
+ out bool use_class_cast)
{
- if (target_type.IsValueType)
- return false;
-
Type expr_type = expr.Type;
-
- if (TypeManager.IsGenericParameter (expr_type))
- return ImplicitTypeParameterConversion (expr, target_type) != null;
-
+ use_class_cast = false;
+
//
- // This is the boxed case.
+ // From any value-type to the type object.
//
if (target_type == TypeManager.object_type) {
- if (expr_type.IsClass || TypeManager.IsValueType (expr_type) ||
- expr_type.IsInterface || expr_type == TypeManager.enum_type)
- if (target_type != TypeManager.anonymous_method_type)
+ //
+ // A pointer type cannot be converted to object
+ //
+ if (expr_type.IsPointer)
+ return false;
+
+ return TypeManager.IsValueType (expr_type);
+ }
+
+ //
+ // From any value-type to the type System.ValueType.
+ //
+ if (target_type == TypeManager.value_type)
+ return TypeManager.IsValueType (expr_type);
+
+ if (target_type == TypeManager.enum_type) {
+ //
+ // From any enum-type to the type System.Enum.
+ //
+ if (expr_type.IsEnum)
+ return true;
+ //
+ // From any nullable-type with an underlying enum-type to the type System.Enum
+ //
+ if (TypeManager.IsNullableType (expr_type))
+ return TypeManager.GetTypeArguments (expr_type) [0].IsEnum;
+ }
+
+ if (TypeManager.IsSubclassOf (expr_type, target_type)) {
+ if (TypeManager.IsGenericParameter (expr_type))
return true;
return false;
- } else if (TypeManager.IsSubclassOf (expr_type, target_type))
- return true;
+ }
- // Please remember that all code below actually comes
- // from ImplicitReferenceConversion so make sure code remains in sync
+ // This code is kind of mirrored inside ImplicitStandardConversionExists
+ // with the small distinction that we only probe there
+ //
+ // Always ensure that the code here and there is in sync
// from any class-type S to any interface-type T.
if (target_type.IsInterface) {
}
if (TypeManager.ImplementsInterface (expr_type, target_type))
- return true;
+ return TypeManager.IsGenericParameter (expr_type) ||
+ TypeManager.IsValueType (expr_type);
}
- // from any interface type S to interface-type T.
- if (expr_type.IsInterface && target_type.IsInterface)
- if (TypeManager.ImplementsInterface (expr_type, target_type))
- return true;
-
- // from an array-type S to an array-type of type T
- if (expr_type.IsArray && target_type.IsArray) {
- if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
-
- Type expr_element_type = expr_type.GetElementType ();
-
- if (MyEmptyExpr == null)
- MyEmptyExpr = new EmptyExpression ();
-
- MyEmptyExpr.SetType (expr_element_type);
- Type target_element_type = TypeManager.GetElementType (target_type);
-
- if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
- if (ImplicitStandardConversionExists (MyEmptyExpr,
- target_element_type))
- return true;
- }
- }
-
- // from an array-type to System.Array
- if (expr_type.IsArray && (target_type == TypeManager.array_type))
- return true;
+ if (TypeManager.IsGenericParameter (expr_type))
+ return ImplicitTypeParameterBoxingConversion (
+ expr_type, target_type, out use_class_cast);
- // from an array-type of type T to IList<T>
- if (expr_type.IsArray && Array_To_IList (expr_type, target_type))
- return true;
+ return false;
+ }
- // from any delegate type to System.Delegate
- if ((expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type)) &&
- target_type == TypeManager.delegate_type)
- if (target_type.IsAssignableFrom (expr_type))
- return true;
+ //
+ // Tests whether an implicit reference conversion exists between expr_type
+ // and target_type
+ //
+ public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
+ {
+ if (target_type.IsValueType)
+ return false;
- // from any array-type or delegate type into System.ICloneable.
- if (expr_type.IsArray ||
- expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type))
- if (target_type == TypeManager.icloneable_type)
- return true;
+ Type expr_type = expr.Type;
// from the null type to any reference-type.
if (expr_type == TypeManager.null_type){
return true;
}
- // from a generic type definition to a generic instance.
- if (TypeManager.IsEqual (expr_type, target_type))
+ if (TypeManager.IsGenericParameter (expr_type))
+ return ImplicitTypeParameterConversion (expr, target_type) != null;
+
+ bool use_class_cast;
+ if (ImplicitReferenceConversionCore (expr, target_type) ||
+ ImplicitBoxingConversionExists (expr, target_type, out use_class_cast))
return true;
return false;
(real_target_type == TypeManager.ushort_type) ||
(real_target_type == TypeManager.int32_type) ||
(real_target_type == TypeManager.uint32_type))
- return new EmptyCast (expr, target_type);
+ return EmptyCast.Create (expr, target_type);
if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
// From short to int, long, float, double, decimal
//
if (real_target_type == TypeManager.int32_type)
- return new EmptyCast (expr, target_type);
+ return EmptyCast.Create (expr, target_type);
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (real_target_type == TypeManager.double_type)
// From ushort to int, uint, long, ulong, float, double, decimal
//
if (real_target_type == TypeManager.uint32_type)
- return new EmptyCast (expr, target_type);
+ return EmptyCast.Create (expr, target_type);
if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if ((real_target_type == TypeManager.ushort_type) ||
(real_target_type == TypeManager.int32_type) ||
(real_target_type == TypeManager.uint32_type))
- return new EmptyCast (expr, target_type);
+ return EmptyCast.Create (expr, target_type);
if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (real_target_type == TypeManager.int64_type)
if (ec.InUnsafe) {
if (expr_type.IsPointer){
if (target_type == TypeManager.void_ptr_type)
- return new EmptyCast (expr, target_type);
+ return EmptyCast.Create (expr, target_type);
//
// yep, comparing pointer types cant be done with
}
if (expr_type == TypeManager.null_type && target_type.IsPointer)
- return new EmptyCast (NullPointer.Null, target_type);
+ return EmptyCast.Create (NullPointer.Null, target_type);
}
if (expr_type == TypeManager.anonymous_method_type){
AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
- int errors = Report.Errors;
-
- Expression conv = ame.Compatible (ec, target_type);
- if (conv != null)
- return conv;
-
- //
- // We return something instead of null, to avoid
- // the duplicate error, since am.Compatible would have
- // reported that already
- //
- if (errors != Report.Errors)
- return new EmptyCast (expr, target_type);
+ AnonymousMethod am = ame.Compatible (ec, target_type);
+ if (am != null)
+ return am.Resolve (ec);
}
return null;
// One of the built-in conversions that belonged in the class library
if (real_target_type == TypeManager.intptr_type){
- return new OperatorCast (new EmptyCast (expr, TypeManager.int64_type),
+ return new OperatorCast (EmptyCast.Create (expr, TypeManager.int64_type),
TypeManager.intptr_type, true);
}
} else if (expr_type == TypeManager.char_type){
return new ConvCast (uint32e, TypeManager.sbyte_type, ConvCast.Mode.U4_I2);
}
if (real_target_type == TypeManager.int32_type){
- return new EmptyCast (new OperatorCast (expr, TypeManager.uint32_type, true),
+ return EmptyCast.Create (new OperatorCast (expr, TypeManager.uint32_type, true),
TypeManager.int32_type);
}
} else if (expr_type == TypeManager.intptr_type){
if (real_target_type == TypeManager.uint64_type){
- return new EmptyCast (new OperatorCast (expr, TypeManager.int64_type, true),
+ return EmptyCast.Create (new OperatorCast (expr, TypeManager.int64_type, true),
TypeManager.uint64_type);
}
} else if (expr_type == TypeManager.decimal_type) {
// From System.Collecitons.Generic.IList<T> and its base interfaces to a one-dimensional
// array type S[], provided there is an implicit or explicit reference conversion from S to T.
//
- if (IList_To_Array(source_type, target_type))
- return new EmptyCast(source, target_type);
+ if (IList_To_Array (source_type, target_type))
+ return new ClassCast (source, target_type);
return null;
}
return new UnboxCast (expr, target_type);
if (TypeManager.IsEnumType (expr_type)) {
- if (expr is EnumConstant)
- return ExplicitConversionCore (ec, ((EnumConstant) expr).Child, target_type, loc);
+ Expression underlying = EmptyCast.Create (expr, TypeManager.EnumToUnderlying (expr_type));
+ expr = ExplicitConversionCore (ec, underlying, target_type, loc);
+ if (expr != null)
+ return expr;
- return ExplicitConversionCore (ec, new EmptyCast (expr, TypeManager.EnumToUnderlying (expr_type)), target_type, loc);
+ return ExplicitUserConversion (ec, underlying, target_type, loc);
}
if (TypeManager.IsEnumType (target_type)){
Expression ce = ExplicitConversionCore (ec, expr, TypeManager.EnumToUnderlying (target_type), loc);
if (ce != null)
- return new EmptyCast (ce, target_type);
+ return EmptyCast.Create (ce, target_type);
+
+ //
+ // LAMESPEC: IntPtr and UIntPtr conversion to any Enum is allowed
+ //
+ if (expr_type == TypeManager.intptr_type || expr_type == TypeManager.uintptr_type) {
+ ne = ExplicitUserConversion (ec, expr, TypeManager.EnumToUnderlying (target_type), loc);
+ if (ne != null)
+ return ExplicitConversionCore (ec, ne, target_type, loc);
+ }
+
+ return null;
}
ne = ExplicitNumericConversion (expr, target_type);
if (ne != null)
return ne;
}
-
- ne = ExplicitUserConversion (ec, expr, target_type, loc);
- if (ne != null)
- return ne;
-
+
return null;
}
if (target_type.IsPointer){
if (expr_type.IsPointer)
- return new EmptyCast (expr, target_type);
+ return EmptyCast.Create (expr, target_type);
if (expr_type == TypeManager.sbyte_type ||
expr_type == TypeManager.short_type ||
return ne;
if (ec.InUnsafe && expr.Type == TypeManager.void_ptr_type && target_type.IsPointer)
- return new EmptyCast (expr, target_type);
+ return EmptyCast.Create (expr, target_type);
expr.Error_ValueCannotBeConverted (ec, l, target_type, true);
return null;
} else if (TypeManager.IsNullableType (expr_type)) {
Expression source = Nullable.Unwrap.Create (expr, ec);
if (source != null) {
- e = ExplicitConversionCore (ec, source, target_type, loc);
- if (e != null)
- return e;
+ return ExplicitConversion (ec, source, target_type, loc);
}
}
#endif
e = ExplicitConversionCore (ec, expr, target_type, loc);
if (e != null)
return e;
+
+ e = ExplicitUserConversion (ec, expr, target_type, loc);
+ if (e != null)
+ return e;
expr.Error_ValueCannotBeConverted (ec, loc, target_type, true);
return null;
projects / mono.git / blobdiff