// Authors:
// Miguel de Icaza (miguel@ximian.com)
// Ravi Pratap (ravi@ximian.com)
+// Marek Safar (marek.safar@gmail.com)
//
-// (C) 2001, 2002, 2003 Ximian, Inc.
+// Copyright 2001, 2002, 2003 Ximian, Inc.
+// Copyright 2003-2008 Novell, Inc.
//
namespace Mono.CSharp {
}
#endif
- //
- // From a one-dimensional array-type S[] to System.Collections.IList<S> and base
- // interfaces of this interface.
//
// From a one-dimensional array-type S[] to System.Collections.IList<T> and base
// interfaces of this interface, provided there is an implicit reference conversion
static bool Array_To_IList (Type array, Type list)
{
#if GMCS_SOURCE
- if (!array.IsArray || (array.GetArrayRank () != 1) || !list.IsGenericType)
+ if ((array.GetArrayRank () != 1) || !list.IsGenericType)
return false;
Type gt = list.GetGenericTypeDefinition ();
return false;
#endif
}
+
+ static bool IList_To_Array(Type list, Type array)
+ {
+# if GMCS_SOURCE
+ if (!list.IsGenericType || !array.IsArray || array.GetArrayRank() != 1)
+ return false;
+
+ Type gt = list.GetGenericTypeDefinition();
+ if (gt != TypeManager.generic_ilist_type &&
+ gt != TypeManager.generic_icollection_type &&
+ gt != TypeManager.generic_ienumerable_type)
+ return false;
+
+ Type arg_type = TypeManager.GetTypeArguments(list)[0];
+ Type element_type = TypeManager.GetElementType(array);
+
+ if (element_type == arg_type)
+ return true;
+
+ if (MyEmptyExpr == null)
+ MyEmptyExpr = new EmptyExpression();
+ MyEmptyExpr.SetType(element_type);
+ return ImplicitReferenceConversionExists(MyEmptyExpr, arg_type) || ExplicitReferenceConversionExists(element_type, arg_type);
+#else
+ return false;
+#endif
+ }
static Expression ImplicitTypeParameterConversion (Expression expr,
Type target_type)
return null;
}
- static bool ExplicitTypeParameterConversionExists (Type source_type, Type target_type)
+ static bool ImplicitTypeParameterBoxingConversion (Type expr_type, Type target_type,
+ out bool use_class_cast)
{
#if GMCS_SOURCE
- if (target_type.IsInterface)
+ 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 (target_type)) {
GenericConstraints gc = TypeManager.GetTypeParameterConstraints (target_type);
if (gc == null)
}
}
#endif
- return false;
+ return target_type.IsInterface;
}
static Expression ExplicitTypeParameterConversion (Expression source, Type target_type)
#if GMCS_SOURCE
Type source_type = source.Type;
- if (target_type.IsInterface)
- return new ClassCast (source, target_type);
-
if (TypeManager.IsGenericParameter (target_type)) {
GenericConstraints gc = TypeManager.GetTypeParameterConstraints (target_type);
if (gc == null)
return new ClassCast (source, target_type);
}
}
+
+ if (target_type.IsInterface)
+ return new ClassCast (source, target_type);
#endif
return null;
}
static EmptyExpression MyEmptyExpr;
- static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
+ static Expression ImplicitReferenceConversion (Expression expr, Type target_type, bool explicit_cast)
{
Type expr_type = expr.Type;
if (TypeManager.IsGenericParameter (expr_type))
return ImplicitTypeParameterConversion (expr, target_type);
+ //
+ // from the null type to any reference-type.
+ //
+ NullLiteral nl = expr as NullLiteral;
+ if (nl != null) {
+ return nl.ConvertImplicitly(target_type);
+ }
+
+ if (ImplicitReferenceConversionExists (expr, target_type)) {
+ //
+ // Reduce implicit reference conversion to object
+ //
+ if (!explicit_cast && target_type == TypeManager.object_type)
+ return expr;
+
+ 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;
+ }
+
+ //
+ // 6.1.6 Implicit reference conversions
+ //
+ public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
+ {
+ if (target_type.IsValueType)
+ return false;
+
+ Type expr_type = expr.Type;
+
+ // from the null type to any reference-type.
+ if (expr_type == TypeManager.null_type)
+ return target_type != TypeManager.anonymous_method_type;
+
+ if (TypeManager.IsGenericParameter (expr_type))
+ return ImplicitTypeParameterConversion (expr, target_type) != null;
+
//
// 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.
// System.Enum is not a value type, it is a class, so we need
// a boxing conversion
//
- if (expr_type.IsEnum || TypeManager.IsGenericParameter (expr_type))
- return new BoxedCast (expr, target_type);
-
- return new EmptyCast (expr, target_type);
+ if (target_type == TypeManager.enum_type || TypeManager.IsGenericParameter (expr_type))
+ return false;
+
+ 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.ToType(target_type);
- }
-
// from any class-type S to any interface-type T.
if (target_type.IsInterface) {
- if (target_type != TypeManager.iconvertible_type &&
- expr_type.IsValueType && (expr is Constant) &&
- !(expr is IntLiteral || expr is BoolLiteral ||
- expr is FloatLiteral || expr is DoubleLiteral ||
- expr is LongLiteral || expr is CharLiteral ||
- expr is StringLiteral || expr is DecimalLiteral ||
- expr is UIntLiteral || expr is ULongLiteral)) {
- return null;
- }
-
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);
-
- // 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);
+ if (target_type == TypeManager.delegate_type &&
+ (expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_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)
- 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
-
- // from any class-type S to any interface-type T.
- if (target_type.IsInterface) {
- if (target_type != TypeManager.iconvertible_type &&
- expr_type.IsValueType && (expr is Constant) &&
- !(expr is IntLiteral || expr is BoolLiteral ||
- expr is FloatLiteral || expr is DoubleLiteral ||
- expr is LongLiteral || expr is CharLiteral ||
- expr is StringLiteral || expr is DecimalLiteral ||
- expr is UIntLiteral || expr is ULongLiteral)) {
+ //
+ // A pointer type cannot be converted to object
+ //
+ if (expr_type.IsPointer)
return false;
- }
- if (TypeManager.ImplementsInterface (expr_type, target_type))
- return true;
+ 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);
- // from any interface type S to interface-type T.
- if (expr_type.IsInterface && target_type.IsInterface)
- if (TypeManager.ImplementsInterface (expr_type, target_type))
+ if (target_type == TypeManager.enum_type) {
+ //
+ // From any enum-type to the type System.Enum.
+ //
+ if (expr_type.IsEnum)
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 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;
}
- // from an array-type to System.Array
- if (expr_type.IsArray && (target_type == TypeManager.array_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 true;
-
- // 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))
+ if (TypeManager.IsSubclassOf (expr_type, target_type)) {
+ //
+ // Don't box same type arguments
+ //
+ if (TypeManager.IsGenericParameter (expr_type) && expr_type != 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 true;
+ return false;
+ }
- // from the null type to any reference-type.
- if (expr_type == TypeManager.null_type){
- if (target_type.IsPointer)
- return true;
+ // 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
- if (!target_type.IsValueType)
- return true;
+ // from any class-type S to any interface-type T.
+ if (target_type.IsInterface) {
+ if (TypeManager.ImplementsInterface (expr_type, target_type))
+ return TypeManager.IsGenericParameter (expr_type) ||
+ TypeManager.IsValueType (expr_type);
}
- // from a generic type definition to a generic instance.
- if (TypeManager.IsEqual (expr_type, target_type))
- return true;
+ if (TypeManager.IsGenericParameter (expr_type))
+ return ImplicitTypeParameterBoxingConversion (
+ expr_type, target_type, out use_class_cast);
return false;
}
Type target_type)
{
Type expr_type = expr.Type;
-
- //
- // Attempt to do the implicit constant expression conversions
-
- if (expr is Constant){
- if (expr is IntConstant){
- Expression e;
-
- e = TryImplicitIntConversion (target_type, (IntConstant) expr);
-
- if (e != null)
- return e;
- } else if (expr is LongConstant && target_type == TypeManager.uint64_type){
- //
- // Try the implicit constant expression conversion
- // from long to ulong, instead of a nice routine,
- // we just inline it
- //
- long v = ((LongConstant) expr).Value;
- if (v >= 0)
- return new ULongConstant ((ulong) v, expr.Location);
- }
- }
-
Type real_target_type = target_type;
if (expr_type == TypeManager.sbyte_type){
//
// From byte to short, ushort, int, uint, long, ulong, float, double, decimal
//
- if ((real_target_type == TypeManager.short_type) ||
- (real_target_type == TypeManager.ushort_type) ||
- (real_target_type == TypeManager.int32_type) ||
- (real_target_type == TypeManager.uint32_type))
- return new EmptyCast (expr, target_type);
+ if (real_target_type == TypeManager.int32_type || real_target_type == TypeManager.uint32_type ||
+ real_target_type == TypeManager.short_type || real_target_type == TypeManager.ushort_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);
-
+ if (real_target_type == TypeManager.int32_type || real_target_type == TypeManager.uint32_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.int32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (real_target_type == TypeManager.double_type)
if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (real_target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R8);
+ return new OpcodeCast (new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un), target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R4);
+ return new OpcodeCast (new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un), target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.decimal_type)
return new CastToDecimal (expr);
} else if (expr_type == TypeManager.int64_type){
// From ulong to float, double
//
if (real_target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R8);
+ return new OpcodeCast (new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un), target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R4);
+ return new OpcodeCast (new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un), target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.decimal_type)
return new CastToDecimal (expr);
} else if (expr_type == TypeManager.char_type){
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 (ImplicitStandardConversionExists (expr, target_type))
return true;
+ if (expr.Type == TypeManager.anonymous_method_type) {
+ if (!TypeManager.IsDelegateType (target_type) &&
+ TypeManager.DropGenericTypeArguments (target_type) != TypeManager.expression_type)
+ return false;
+
+ AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
+ return ame.ImplicitStandardConversionExists (ec, target_type);
+ }
+
return ImplicitUserConversion (ec, expr, target_type, Location.Null) != null;
}
{
Type expr_type = expr.Type;
#if GMCS_SOURCE
- if (TypeManager.IsNullableType (expr_type)) {
- Type nullable = TypeManager.GetTypeArguments (expr_type) [0];
- Expression source = new EmptyExpression (nullable);
+ if (TypeManager.IsNullableType (target_type)) {
+ // if implicit standard conversion S -> T exists, S -> T? and S? -> T? also exists
+ target_type = TypeManager.GetTypeArguments (target_type) [0];
- if (TypeManager.IsNullableType (target_type)) {
- if (ImplicitStandardConversionExists (source, target_type))
- return true;
- if (ImplicitStandardConversionExists (expr, target_type))
- return true;
+ // S? -> T?
+ if (TypeManager.IsNullableType (expr_type)) {
+ EmptyExpression new_expr = EmptyExpression.Grab ();
+ new_expr.SetType (TypeManager.GetTypeArguments (expr_type) [0]);
+ bool retval = ImplicitStandardConversionExists (new_expr, target_type);
+ EmptyExpression.Release (new_expr);
+ return retval;
}
- } else if (TypeManager.IsNullableTypeOf (target_type, expr_type))
- return true;
+ }
#endif
if (expr_type == TypeManager.void_type)
return false;
//Console.WriteLine ("Expr is {0}", expr);
//Console.WriteLine ("{0} -> {1} ?", expr_type, target_type);
- if (expr_type.Equals (target_type))
+ if (TypeManager.IsEqual (expr_type, target_type))
return true;
} else if (expr_type == TypeManager.short_type){
//
- // From short to int, long, double, float, decimal
+ // From short to int, long, double, float, decimal
//
if ((target_type == TypeManager.int32_type) ||
(target_type == TypeManager.int64_type) ||
return DelegateCreation.ImplicitStandardConversionExists (mg, target_type) != null;
}
}
+
+ return false;
}
if (ImplicitReferenceConversionExists (expr, target_type))
return true;
+ bool use_class_cast;
+ if (ImplicitBoxingConversionExists (expr, target_type, out use_class_cast))
+ return true;
+
//
// Implicit Constant Expression Conversions
//
return true;
}
- if ((target_type == TypeManager.enum_type ||
- target_type.IsSubclassOf (TypeManager.enum_type)) &&
- expr is IntLiteral){
- IntLiteral i = (IntLiteral) expr;
-
- if (i.Value == 0)
- return true;
- }
-
//
// If `expr_type' implements `target_type' (which is an iface)
// see TryImplicitIntConversion
if (target_type == TypeManager.void_ptr_type && expr_type.IsPointer)
return true;
- if (expr_type == TypeManager.anonymous_method_type){
- if (!TypeManager.IsDelegateType (target_type))
- return false;
-
- AnonymousMethod am = (AnonymousMethod) expr;
- return am.ImplicitStandardConversionExists (target_type);
- }
-
return false;
}
//
Type source_type = source.Type;
foreach (MethodBase mb in list){
- ParameterData pd = TypeManager.GetParameterData (mb);
- Type param_type = pd.ParameterType (0);
+ AParametersCollection pd = TypeManager.GetParameterData (mb);
+ Type param_type = pd.Types [0];
if (param_type == source_type)
return param_type;
// If any operator converts to T then Tx = T
//
foreach (MethodInfo mi in list){
- Type ret_type = mi.ReturnType;
+ Type ret_type = TypeManager.TypeToCoreType (mi.ReturnType);
if (ret_type == target)
return ret_type;
static public Expression ImplicitUserConversion (EmitContext ec, Expression source,
Type target, Location loc)
{
- return UserDefinedConversion (ec, source, target, loc, false);
+ Expression expr = UserDefinedConversion (ec, source, target, loc, false);
+ if (expr != null && !TypeManager.IsEqual (expr.Type, target))
+ expr = ImplicitConversionStandard (ec, expr, target, loc);
+
+ return expr;
}
/// <summary>
static public Expression ExplicitUserConversion (EmitContext ec, Expression source,
Type target, Location loc)
{
- return UserDefinedConversion (ec, source, target, loc, true);
+ Expression expr = UserDefinedConversion (ec, source, target, loc, true);
+ if (expr != null && !TypeManager.IsEqual (expr.Type, target))
+ expr = ExplicitConversionStandard (ec, expr, target, loc);
+
+ return expr;
}
static void AddConversionOperators (ArrayList list,
Type source_type = source.Type;
EmptyExpression expr = EmptyExpression.Grab ();
+
+ //
+ // LAMESPEC: Undocumented IntPtr/UIntPtr conversions
+ // IntPtr -> uint uses int
+ // UIntPtr -> long uses ulong
+ //
+ if (source_type == TypeManager.intptr_type) {
+ if (target_type == TypeManager.uint32_type)
+ target_type = TypeManager.int32_type;
+ } else if (source_type == TypeManager.uintptr_type) {
+ if (target_type == TypeManager.int64_type)
+ target_type = TypeManager.uint64_type;
+ }
+
foreach (MethodInfo m in mg.Methods) {
- ParameterData pd = TypeManager.GetParameterData (m);
- Type return_type = m.ReturnType;
- Type arg_type = pd.ParameterType (0);
+ AParametersCollection pd = TypeManager.GetParameterData (m);
+ Type return_type = TypeManager.TypeToCoreType (m.ReturnType);
+ Type arg_type = pd.Types [0];
if (source_type != arg_type) {
if (!ImplicitStandardConversionExists (source, arg_type)) {
}
}
+ // See LAMESPEC: Exclude IntPtr -> int conversion
+ if (source_type == TypeManager.uintptr_type && return_type == TypeManager.uint32_type)
+ continue;
+
list.Add (m);
}
/// Compute the user-defined conversion operator from source_type to target_type.
/// `look_for_explicit' controls whether we should also include the list of explicit operators
/// </summary>
- static MethodInfo GetConversionOperator (EmitContext ec, Expression source, Type target_type, bool look_for_explicit)
+ static MethodInfo GetConversionOperator (Type container_type, Expression source, Type target_type, bool look_for_explicit)
{
ArrayList ops = new ArrayList (4);
if (source_type != TypeManager.decimal_type) {
AddConversionOperators (ops, source, target_type, look_for_explicit,
- Expression.MethodLookup (ec, source_type, "op_Implicit", Location.Null) as MethodGroupExpr);
+ Expression.MethodLookup (container_type, source_type, "op_Implicit", Location.Null) as MethodGroupExpr);
if (look_for_explicit) {
AddConversionOperators (ops, source, target_type, look_for_explicit,
Expression.MethodLookup (
- ec, source_type, "op_Explicit", Location.Null) as MethodGroupExpr);
+ container_type, source_type, "op_Explicit", Location.Null) as MethodGroupExpr);
}
}
if (target_type != TypeManager.decimal_type) {
AddConversionOperators (ops, source, target_type, look_for_explicit,
- Expression.MethodLookup (ec, target_type, "op_Implicit", Location.Null) as MethodGroupExpr);
+ Expression.MethodLookup (container_type, target_type, "op_Implicit", Location.Null) as MethodGroupExpr);
if (look_for_explicit) {
AddConversionOperators (ops, source, target_type, look_for_explicit,
Expression.MethodLookup (
- ec, target_type, "op_Explicit", Location.Null) as MethodGroupExpr);
+ container_type, target_type, "op_Explicit", Location.Null) as MethodGroupExpr);
}
}
MethodInfo method = null;
foreach (MethodInfo m in ops) {
- if (m.ReturnType != most_specific_target)
+ if (TypeManager.TypeToCoreType (m.ReturnType) != most_specific_target)
continue;
- if (TypeManager.GetParameterData (m).ParameterType (0) != most_specific_source)
+ if (TypeManager.GetParameterData (m).Types [0] != most_specific_source)
continue;
// Ambiguous: more than one conversion operator satisfies the signature.
if (method != null)
MethodInfo method = null;
object o;
- DoubleHash hash = look_for_explicit ? explicit_conv : implicit_conv;
+ DoubleHash hash;
+ if (look_for_explicit) {
+ hash = explicit_conv;
+ } else {
+ // Implicit user operators cannot convert to interfaces
+ if (target.IsInterface)
+ return null;
+
+ hash = implicit_conv;
+ }
if (!(source is Constant) && hash.Lookup (source_type, target, out o)) {
method = (MethodInfo) o;
} else {
- method = GetConversionOperator (ec, source, target, look_for_explicit);
+ method = GetConversionOperator (null, source, target, look_for_explicit);
if (!(source is Constant))
hash.Insert (source_type, target, method);
}
if (method == null)
return null;
- Type most_specific_source = TypeManager.GetParameterData (method).ParameterType (0);
+ Type most_specific_source = TypeManager.GetParameterData (method).Types [0];
//
// This will do the conversion to the best match that we
if (source == null)
return null;
- Expression e;
- e = new UserCast (method, source, loc);
- if (e.Type != target){
- if (!look_for_explicit)
- e = ImplicitConversionStandard (ec, e, target, loc);
- else
- e = ExplicitConversionStandard (ec, e, target, loc);
- }
-
- return e;
+ return new UserCast (method, source, loc);
}
/// <summary>
/// </summary>
static public Expression ImplicitConversionStandard (EmitContext ec, Expression expr,
Type target_type, Location loc)
+ {
+ return ImplicitConversionStandard (ec, expr, target_type, loc, false);
+ }
+
+ static Expression ImplicitConversionStandard (EmitContext ec, Expression expr, Type target_type, Location loc, bool explicit_cast)
{
Type expr_type = expr.Type;
Expression e;
+
#if GMCS_SOURCE
- // TODO: refactor to be a part of constant infrastructure
- if (expr is NullLiteral) {
- if (TypeManager.IsNullableType (target_type))
- return new Nullable.NullableLiteral (target_type, loc);
- }
-
if (TypeManager.IsNullableType (target_type)) {
+ //
+ // From null to any nullable type
+ //
+ if (expr_type == TypeManager.null_type)
+ return Nullable.LiftedNull.Create (target_type, loc);
+
Type target = TypeManager.GetTypeArguments (target_type) [0];
- if (TypeManager.IsNullableType (expr.Type)) {
- e = new Nullable.LiftedConversion (
+ if (TypeManager.IsNullableType (expr_type)) {
+ Type etype = TypeManager.GetTypeArguments (expr_type) [0];
+ if (TypeManager.IsEqual (etype, target))
+ return expr;
+
+ return new Nullable.LiftedConversion (
expr, target_type, false, false, loc).Resolve (ec);
- if (e != null)
- return e;
} else {
e = ImplicitConversion (ec, expr, target, loc);
if (e != null)
- return Nullable.Wrap.Create (e, ec);
+ return Nullable.Wrap.Create (e, target_type);
}
}
#endif
}
}
- if (expr_type.Equals (target_type) && !TypeManager.IsNullType (expr_type))
- return expr;
+ if (expr_type.Equals (target_type)) {
+ if (expr_type != TypeManager.null_type && expr_type != TypeManager.anonymous_method_type)
+ return expr;
+ return null;
+ }
+
+ //
+ // Attempt to do the implicit constant expression conversions
+ //
+ Constant c = expr as Constant;
+ if (c != null) {
+ //
+ // If `target_type' is an interface and the type of `ic' implements the interface
+ // e.g. target_type is IComparable, IConvertible, IFormattable
+ //
+ if (c.Type == TypeManager.int32_type && target_type.IsInterface && target_type.IsAssignableFrom (c.Type))
+ return new BoxedCast (c, target_type);
+
+ try {
+ c = c.ConvertImplicitly (target_type);
+ } catch {
+ Console.WriteLine ("Conversion error happened in line {0}", loc);
+ throw;
+ }
+ if (c != null)
+ return c;
+ }
e = ImplicitNumericConversion (expr, target_type);
if (e != null)
return e;
- e = ImplicitReferenceConversion (expr, target_type);
+ e = ImplicitReferenceConversion (expr, target_type, explicit_cast);
if (e != null)
return e;
- if (TypeManager.IsEnumType (target_type) && expr is IntLiteral){
- IntLiteral i = (IntLiteral) expr;
-
- if (i.Value == 0)
- return new EnumConstant ((Constant) expr, target_type);
+ if (expr is IntConstant && TypeManager.IsEnumType (target_type)){
+ Constant i = (Constant) expr;
+ //
+ // LAMESPEC: Conversion from any 0 constant is allowed
+ //
+ // An implicit enumeration conversion permits the decimal-integer-literal 0
+ // to be converted to any enum-type and to any nullable-type whose underlying
+ // type is an enum-type
+ //
+ if (i.IsDefaultValue)
+ return new EnumConstant (i, target_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){
- if (!TypeManager.IsDelegateType (target_type)){
- Report.Error (1660, loc,
- "Cannot convert anonymous method block to type `{0}' because it is not a delegate type",
- TypeManager.CSharpName (target_type));
- return null;
- }
-
- AnonymousMethod am = (AnonymousMethod) expr;
- int errors = Report.Errors;
-
- Expression conv = am.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);
+ AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
+ Expression am = ame.Compatible (ec, target_type);
+ if (am != null)
+ return am.DoResolve (ec);
}
return null;
}
- /// <summary>
- /// Attempts to perform an implicit constant conversion of the IntConstant
- /// into a different data type using casts (See Implicit Constant
- /// Expression Conversions)
- /// </summary>
- static public Expression TryImplicitIntConversion (Type target_type, IntConstant ic)
- {
- int value = ic.Value;
-
- if (target_type == TypeManager.sbyte_type){
- if (value >= SByte.MinValue && value <= SByte.MaxValue)
- return new SByteConstant ((sbyte) value, ic.Location);
- } else if (target_type == TypeManager.byte_type){
- if (value >= Byte.MinValue && value <= Byte.MaxValue)
- return new ByteConstant ((byte) value, ic.Location);
- } else if (target_type == TypeManager.short_type){
- if (value >= Int16.MinValue && value <= Int16.MaxValue)
- return new ShortConstant ((short) value, ic.Location);
- } else if (target_type == TypeManager.ushort_type){
- if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
- return new UShortConstant ((ushort) value, ic.Location);
- } else if (target_type == TypeManager.uint32_type){
- if (value >= 0)
- return new UIntConstant ((uint) value, ic.Location);
- } else if (target_type == TypeManager.uint64_type){
- //
- // we can optimize this case: a positive int32
- // always fits on a uint64. But we need an opcode
- // to do it.
- //
- if (value >= 0)
- return new ULongConstant ((ulong) value, ic.Location);
- } else if (target_type == TypeManager.double_type)
- return new DoubleConstant ((double) value, ic.Location);
- else if (target_type == TypeManager.float_type)
- return new FloatConstant ((float) value, ic.Location);
-
- if (value == 0 && ic is IntLiteral && TypeManager.IsEnumType (target_type)){
- Type underlying = TypeManager.EnumToUnderlying (target_type);
- Constant e = (Constant) ic;
-
- //
- // Possibly, we need to create a different 0 literal before passing
- // to EnumConstant
- //
- if (underlying == TypeManager.int64_type)
- e = new LongLiteral (0, ic.Location);
- else if (underlying == TypeManager.uint64_type)
- e = new ULongLiteral (0, ic.Location);
-
- return new EnumConstant (e, target_type);
- }
-
- //
- // If `target_type' is an interface and the type of `ic' implements the interface
- // e.g. target_type is IComparable, IConvertible, IFormattable
- //
- if (target_type.IsInterface && target_type.IsAssignableFrom (ic.Type))
- return new BoxedCast (ic, target_type);
-
- return null;
- }
-
/// <summary>
/// Attempts to implicitly convert `source' into `target_type', using
/// ImplicitConversion. If there is no implicit conversion, then
if (e != null)
return e;
- source.Error_ValueCannotBeConverted (loc, target_type, false);
+ source.Error_ValueCannotBeConverted (ec, loc, target_type, false);
return null;
}
/// <summary>
/// Performs the explicit numeric conversions
+ ///
+ /// There are a few conversions that are not part of the C# standard,
+ /// they were interim hacks in the C# compiler that were supposed to
+ /// become explicit operators in the UIntPtr class and IntPtr class,
+ /// but for historical reasons it did not happen, so the C# compiler
+ /// ended up with these special hacks.
+ ///
+ /// See bug 59800 for details.
+ ///
+ /// The conversion are:
+ /// UIntPtr->SByte
+ /// UIntPtr->Int16
+ /// UIntPtr->Int32
+ /// IntPtr->UInt64
+ /// UInt64->IntPtr
+ /// SByte->UIntPtr
+ /// Int16->UIntPtr
+ ///
/// </summary>
public static Expression ExplicitNumericConversion (Expression expr, Type target_type)
{
if (expr_type == TypeManager.sbyte_type){
//
- // From sbyte to byte, ushort, uint, ulong, char
+ // From sbyte to byte, ushort, uint, ulong, char, uintptr
//
if (real_target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I1_U1);
return new ConvCast (expr, target_type, ConvCast.Mode.I1_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I1_CH);
+
+ // One of the built-in conversions that belonged in the class library
+ if (real_target_type == TypeManager.uintptr_type){
+ Expression u8e = new ConvCast (expr, TypeManager.uint64_type, ConvCast.Mode.I1_U8);
+
+ return new OperatorCast (u8e, TypeManager.uintptr_type, true);
+ }
} else if (expr_type == TypeManager.byte_type){
//
// From byte to sbyte and char
return new ConvCast (expr, target_type, ConvCast.Mode.U1_CH);
} else if (expr_type == TypeManager.short_type){
//
- // From short to sbyte, byte, ushort, uint, ulong, char
+ // From short to sbyte, byte, ushort, uint, ulong, char, uintptr
//
if (real_target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I2_I1);
return new ConvCast (expr, target_type, ConvCast.Mode.I2_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I2_CH);
+
+ // One of the built-in conversions that belonged in the class library
+ if (real_target_type == TypeManager.uintptr_type){
+ Expression u8e = new ConvCast (expr, TypeManager.uint64_type, ConvCast.Mode.I2_U8);
+
+ return new OperatorCast (u8e, TypeManager.uintptr_type, true);
+ }
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to sbyte, byte, short, char
return new ConvCast (expr, target_type, ConvCast.Mode.U2_CH);
} else if (expr_type == TypeManager.int32_type){
//
- // From int to sbyte, byte, short, ushort, uint, ulong, char
+ // From int to sbyte, byte, short, ushort, uint, ulong, char, uintptr
//
if (real_target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_I1);
return new ConvCast (expr, target_type, ConvCast.Mode.I4_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_CH);
+
+ // One of the built-in conversions that belonged in the class library
+ if (real_target_type == TypeManager.uintptr_type){
+ Expression u8e = new ConvCast (expr, TypeManager.uint64_type, ConvCast.Mode.I2_U8);
+
+ return new OperatorCast (u8e, TypeManager.uintptr_type, true);
+ }
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to sbyte, byte, short, ushort, int, char
return new ConvCast (expr, target_type, ConvCast.Mode.U8_I8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_CH);
+
+ // One of the built-in conversions that belonged in the class library
+ if (real_target_type == TypeManager.intptr_type){
+ return new OperatorCast (EmptyCast.Create (expr, TypeManager.int64_type),
+ TypeManager.intptr_type, true);
+ }
} else if (expr_type == TypeManager.char_type){
//
// From char to sbyte, byte, short
return new ConvCast (expr, target_type, ConvCast.Mode.R8_R4);
if (real_target_type == TypeManager.decimal_type)
return new CastToDecimal (expr, true);
+ } else if (expr_type == TypeManager.uintptr_type){
+ //
+ // Various built-in conversions that belonged in the class library
+ //
+ // from uintptr to sbyte, short, int32
+ //
+ if (real_target_type == TypeManager.sbyte_type){
+ Expression uint32e = new OperatorCast (expr, TypeManager.uint32_type, true);
+ return new ConvCast (uint32e, TypeManager.sbyte_type, ConvCast.Mode.U4_I1);
+ }
+ if (real_target_type == TypeManager.short_type){
+ Expression uint32e = new OperatorCast (expr, TypeManager.uint32_type, true);
+ return new ConvCast (uint32e, TypeManager.sbyte_type, ConvCast.Mode.U4_I2);
+ }
+ if (real_target_type == TypeManager.int32_type){
+ 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 EmptyCast.Create (new OperatorCast (expr, TypeManager.int64_type, true),
+ TypeManager.uint64_type);
+ }
} else if (expr_type == TypeManager.decimal_type) {
return new CastFromDecimal (expr, target_type).Resolve ();
}
return true;
+ if (source_type.IsInterface && IList_To_Array (source_type, target_type))
+ return true;
+
// From an array type S with an element type Se to an array type T with an
// element type Te provided all the following are true:
// * S and T differe only in element type, in other words, S and T
TypeManager.IsDelegateType (target_type))
return true;
- //
- // From ICloneable to Array or Delegate types
- //
- if (source_type == TypeManager.icloneable_type &&
- (target_type == TypeManager.array_type ||
- target_type == TypeManager.delegate_type))
- return true;
-
return false;
}
// Unboxing conversion.
//
if (((source_type == TypeManager.enum_type &&
- !(source is EmptyCast)) ||
+ !(source is TypeCast)) ||
source_type == TypeManager.value_type) && target_is_value_type)
return new UnboxCast (source, target_type);
// From any class type S to any interface T, provides S is not sealed
// and provided S does not implement T.
//
- if (target_type.IsInterface && !source_type.IsSealed) {
- if (TypeManager.ImplementsInterface (source_type, target_type))
- return null;
- else
- return new ClassCast (source, target_type);
-
+ if (target_type.IsInterface &&
+ (!source_type.IsSealed || source_type.IsArray) && // SRE: IsSealed does not work with aggregates
+ !TypeManager.ImplementsInterface (source_type, target_type)) {
+ return new ClassCast (source, target_type);
}
//
return new UnboxCast (source, target_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 ClassCast (source, target_type);
+
return null;
}
TypeManager.IsDelegateType (target_type))
return new ClassCast (source, target_type);
- //
- // From ICloneable to Array or Delegate types
- //
- if (source_type == TypeManager.icloneable_type &&
- (target_type == TypeManager.array_type ||
- target_type == TypeManager.delegate_type))
- return new ClassCast (source, target_type);
-
return null;
}
Type expr_type = expr.Type;
// Explicit conversion includes implicit conversion and it used for enum underlying types too
- Expression ne = ImplicitConversionStandard (ec, expr, target_type, loc);
+ Expression ne = ImplicitConversionStandard (ec, expr, target_type, loc, true);
if (ne != null)
return ne;
//
// Unboxing conversions; only object types can be convertible to enum
//
- if (expr_type == TypeManager.object_type && target_type.IsValueType || expr_type == TypeManager.enum_type)
+ if (expr_type == TypeManager.object_type && target_type.IsValueType)
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.GetEnumUnderlyingType (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 (expr_type == TypeManager.enum_type)
+ return new UnboxCast (expr, target_type);
+
+ Expression ce = ExplicitConversionCore (ec, expr, TypeManager.GetEnumUnderlyingType (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.GetEnumUnderlyingType (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 ||
- expr_type == TypeManager.int32_type ||
- expr_type == TypeManager.int64_type)
+ expr_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I);
if (expr_type == TypeManager.ushort_type ||
expr_type == TypeManager.uint32_type ||
- expr_type == TypeManager.uint64_type ||
+ expr_type == TypeManager.uint64_type || expr_type == TypeManager.int64_type ||
expr_type == TypeManager.byte_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
}
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
else if (target_type == TypeManager.uint32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- else if (target_type == TypeManager.uint64_type)
+ else if (target_type == TypeManager.uint64_type || target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- else if (target_type == TypeManager.int64_type){
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- }
}
return null;
}
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 (l, target_type, true);
+ expr.Error_ValueCannotBeConverted (ec, l, target_type, true);
return null;
}
e = ExplicitConversionCore (ec, expr, target, loc);
if (e != null)
- return Nullable.Wrap.Create (e, ec);
+ return Nullable.Wrap.Create (e, target_type);
}
} 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;
- }
+ e = Nullable.Unwrap.Create (expr, ec);
+
+ bool use_class_cast;
+ if (ImplicitBoxingConversionExists (e, target_type, out use_class_cast))
+ return new BoxedCast (expr, target_type);
+
+ e = ExplicitConversion (ec, e, target_type, loc);
+ if (e != null)
+ e = EmptyCast.Create (e, target_type);
+ return e;
}
#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 (loc, target_type, true);
+ expr.Error_ValueCannotBeConverted (ec, loc, target_type, true);
return null;
}
}
projects / mono.git / blobdiff