// Authors:
// Miguel de Icaza (miguel@ximian.com)
// Ravi Pratap (ravi@ximian.com)
+// Marek Safar (marek.safar@gmail.com)
//
// (C) 2001, 2002, 2003 Ximian, Inc.
//
// A container class for all the conversion operations
//
public class Convert {
+#if GMCS_SOURCE
+ static bool TypeParameter_to_Null (Type target_type)
+ {
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (target_type);
+ if (gc == null)
+ return false;
+
+ if (gc.HasReferenceTypeConstraint)
+ return true;
+ if (gc.HasClassConstraint && !TypeManager.IsValueType (gc.ClassConstraint))
+ return true;
+
+ return false;
+ }
+
+ static Type TypeParam_EffectiveBaseType (GenericConstraints gc)
+ {
+ ArrayList list = new ArrayList ();
+ list.Add (gc.EffectiveBaseClass);
+ foreach (Type t in gc.InterfaceConstraints) {
+ if (!TypeManager.IsGenericParameter (t))
+ continue;
+
+ GenericConstraints new_gc = TypeManager.GetTypeParameterConstraints (t);
+ if (new_gc != null)
+ list.Add (TypeParam_EffectiveBaseType (new_gc));
+ }
+ return FindMostEncompassedType (list);
+ }
+#endif
+
//
- // This is used to prettify the code: a null argument is allowed
- // for ImplicitStandardConversion as long as it is known that
- // no anonymous method will play a role.
+ // From a one-dimensional array-type S[] to System.Collections.IList<S> and base
+ // interfaces of this interface.
//
- // FIXME: renamed from `const' to `static' to allow bootstraping from older
- // versions of the compiler that could not cope with this construct.
+ // 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
+ // from S to T.
//
- public static EmitContext ConstantEC = null;
+ static bool Array_To_IList (Type array, Type list)
+ {
+#if GMCS_SOURCE
+ if (!array.IsArray || (array.GetArrayRank () != 1) || !list.IsGenericType)
+ 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 element_type = TypeManager.GetElementType (array);
+ Type arg_type = TypeManager.GetTypeArguments (list) [0];
+
+ if (element_type == arg_type)
+ return true;
+
+ if (MyEmptyExpr == null)
+ MyEmptyExpr = new EmptyExpression ();
+ MyEmptyExpr.SetType (TypeManager.GetElementType (array));
+
+ return ImplicitReferenceConversionCore (MyEmptyExpr, arg_type);
+#else
+ return false;
+#endif
+ }
- static public void Error_CannotConvertType (Location loc, Type source, Type target)
+ static bool IList_To_Array(Type list, Type array)
{
- Report.Error (30, loc, "Cannot convert type '" +
- TypeManager.CSharpName (source) + "' to '" +
- TypeManager.CSharpName (target) + "'");
+# 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)
+ {
+#if GMCS_SOURCE
+ Type expr_type = expr.Type;
+
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (expr_type);
+
+ if (gc == null) {
+ if (target_type == TypeManager.object_type)
+ return new BoxedCast (expr, target_type);
+
+ return null;
+ }
+
+ // 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 new ClassCast (expr, target_type);
+
+ if (target_type.IsInterface) {
+ if (TypeManager.ImplementsInterface (base_type, target_type))
+ return new ClassCast (expr, target_type);
+
+ foreach (Type t in gc.InterfaceConstraints) {
+ if (TypeManager.IsSubclassOf (t, target_type))
+ return new ClassCast (expr, target_type);
+ if (TypeManager.ImplementsInterface (t, target_type))
+ return new ClassCast (expr, target_type);
+ }
+ }
+
+ foreach (Type t in gc.InterfaceConstraints) {
+ if (!TypeManager.IsGenericParameter (t))
+ continue;
+ if (TypeManager.IsSubclassOf (t, target_type))
+ return new ClassCast (expr, target_type);
+ if (TypeManager.ImplementsInterface (t, target_type))
+ return new ClassCast (expr, target_type);
+ }
+#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 (target_type.IsInterface)
+ return true;
+
+ if (TypeManager.IsGenericParameter (target_type)) {
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (target_type);
+ if (gc == null)
+ return false;
+
+ foreach (Type iface in gc.InterfaceConstraints) {
+ if (!TypeManager.IsGenericParameter (iface))
+ continue;
+
+ if (TypeManager.IsSubclassOf (source_type, iface))
+ return true;
+ }
+ }
+#endif
+ return false;
+ }
+
+ 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 null;
+
+ foreach (Type iface in gc.InterfaceConstraints) {
+ if (!TypeManager.IsGenericParameter (iface))
+ continue;
+
+ if (TypeManager.IsSubclassOf (source_type, iface))
+ return new ClassCast (source, target_type);
+ }
+ }
+#endif
+ return null;
}
static EmptyExpression MyEmptyExpr;
if (expr_type == TypeManager.void_type)
return null;
-
+
+ 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.
if (target_type == TypeManager.object_type) {
//
// A pointer type cannot be converted to object
- //
+ //
if (expr_type.IsPointer)
- return null;
+ return false;
- if (expr_type.IsValueType)
- return new BoxedCast (expr, target_type);
+ if (TypeManager.IsValueType (expr_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 (expr_type.IsValueType)
- return new BoxedCast (expr, target_type);
- if (expr_type == TypeManager.null_type)
- return new NullCast (expr, target_type);
-
- return null;
- } else if (expr_type.IsSubclassOf (target_type)) {
+ 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)
- return new BoxedCast (expr, target_type);
+ if (expr_type.IsEnum || TypeManager.IsGenericParameter (expr_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){
- if (target_type.IsPointer)
- return new EmptyCast (NullPointer.Null, target_type);
-
- if (!target_type.IsValueType)
- return new NullCast (expr, 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 (expr_type.IsClass)
- return new EmptyCast (expr, target_type);
- else if (expr_type.IsValueType)
- 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
if (expr_type.IsArray && target_type.IsArray) {
if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
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 (ConstantEC, 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 true;
+
// from any delegate type to System.Delegate
- if ((expr_type == TypeManager.delegate_type ||
- expr_type.IsSubclassOf (TypeManager.delegate_type)) &&
+ 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 ||
- expr_type.IsSubclassOf (TypeManager.delegate_type))
+ expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type))
if (target_type == TypeManager.icloneable_type)
- return new EmptyCast (expr, target_type);
-
- return null;
+ return true;
+
+ // from a generic type definition to a generic instance.
+ if (TypeManager.IsEqual (expr_type, target_type))
+ return true;
+
+ return false;
}
- //
- // Tests whether an implicit reference conversion exists between expr_type
- // and target_type
- //
- 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;
-
+ 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 || expr_type.IsValueType ||
- expr_type.IsInterface || expr_type == TypeManager.enum_type)
- if (target_type != TypeManager.anonymous_method_type)
- return true;
+ //
+ // 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 (expr_type.IsSubclassOf (target_type))
- 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
- // 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 is UIntLiteral || expr is ULongLiteral)) {
return false;
}
-
+
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 (ConstantEC, MyEmptyExpr,
- target_element_type))
- return true;
- }
- }
-
- // from an array-type to System.Array
- if (expr_type.IsArray && (target_type == TypeManager.array_type))
- return true;
-
- // from any delegate type to System.Delegate
- if ((expr_type == TypeManager.delegate_type ||
- expr_type.IsSubclassOf (TypeManager.delegate_type)) &&
- target_type == TypeManager.delegate_type)
- if (target_type.IsAssignableFrom (expr_type))
- return true;
-
- // from any array-type or delegate type into System.ICloneable.
- if (expr_type.IsArray ||
- expr_type == TypeManager.delegate_type ||
- expr_type.IsSubclassOf (TypeManager.delegate_type))
- if (target_type == TypeManager.icloneable_type)
- return true;
-
+ if (TypeManager.IsGenericParameter (expr_type))
+ return ImplicitTypeParameterBoxingConversion (
+ expr_type, target_type, out use_class_cast);
+
+ return false;
+ }
+
+ //
+ // 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;
+
+ Type expr_type = expr.Type;
+
// from the null type to any reference-type.
if (expr_type == TypeManager.null_type){
if (target_type.IsPointer)
return true;
-
+
if (!target_type.IsValueType)
return true;
}
+
+ 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;
}
/// expr is the expression to convert, returns a new expression of type
/// target_type or null if an implicit conversion is not possible.
/// </summary>
- static public Expression ImplicitNumericConversion (EmitContext ec, Expression expr,
- Type target_type, Location loc)
+ static public Expression ImplicitNumericConversion (Expression expr,
+ 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;
+ Type real_target_type = target_type;
if (expr_type == TypeManager.sbyte_type){
//
if (real_target_type == TypeManager.short_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.byte_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);
+ 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.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
-
+ return new CastToDecimal (expr);
+
} else if (expr_type == TypeManager.short_type){
//
// 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)
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
-
+ return new CastToDecimal (expr);
+
} else if (expr_type == TypeManager.ushort_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.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.int32_type){
//
// From int to long, float, double, decimal
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to long, ulong, float, double, decimal
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R4);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.int64_type){
//
// From long/ulong to float, double
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.uint64_type){
//
// From ulong to float, double
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R4);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.char_type){
//
// From char to ushort, int, uint, long, ulong, float, double, decimal
- //
+ //
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 (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr);
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.float_type){
//
// float to double
return null;
}
-
/// <summary>
/// Same as ImplicitStandardConversionExists except that it also looks at
/// implicit user defined conversions - needed for overload resolution
/// </summary>
public static bool ImplicitConversionExists (EmitContext ec, Expression expr, Type target_type)
{
- if (ImplicitStandardConversionExists (ec, expr, target_type))
- return true;
-
- Expression dummy = ImplicitUserConversion (ec, expr, target_type, Location.Null);
+#if GMCS_SOURCE
+ if (expr is NullLiteral) {
+ if (TypeManager.IsGenericParameter (target_type))
+ return TypeParameter_to_Null (target_type);
- if (dummy != null)
+ if (TypeManager.IsNullableType (target_type))
+ return true;
+ }
+#endif
+ if (ImplicitStandardConversionExists (expr, target_type))
return true;
- return false;
+ return ImplicitUserConversion (ec, expr, target_type, Location.Null) != null;
}
public static bool ImplicitUserConversionExists (EmitContext ec, Type source, Type target)
{
- Expression dummy = ImplicitUserConversion (
- ec, new EmptyExpression (source), target, Location.Null);
- return dummy != null;
+ return ImplicitUserConversion (ec, new EmptyExpression (source), target, Location.Null) != null;
}
/// <summary>
///
/// ec should point to a real EmitContext if expr.Type is TypeManager.anonymous_method_type.
/// </summary>
- public static bool ImplicitStandardConversionExists (EmitContext ec, Expression expr, Type target_type)
+ public static bool ImplicitStandardConversionExists (Expression expr, Type target_type)
{
Type expr_type = expr.Type;
-
+#if GMCS_SOURCE
+ 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];
+
+ // 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;
+ }
+ }
+#endif
if (expr_type == TypeManager.void_type)
return false;
- if (expr_type == target_type)
+ //Console.WriteLine ("Expr is {0}", expr);
+ //Console.WriteLine ("{0} -> {1} ?", expr_type, target_type);
+ if (TypeManager.IsEqual (expr_type, target_type))
return true;
- // First numeric conversions
+ // First numeric conversions
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to short, int, long, float, double, decimal
//
- if ((target_type == TypeManager.int32_type) ||
+ if ((target_type == TypeManager.int32_type) ||
(target_type == TypeManager.int64_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.short_type) ||
(target_type == TypeManager.decimal_type))
return true;
-
+
} else if (expr_type == TypeManager.byte_type){
//
// From byte to short, ushort, int, uint, long, ulong, float, double, decimal
- //
+ //
if ((target_type == TypeManager.short_type) ||
(target_type == TypeManager.ushort_type) ||
(target_type == TypeManager.int32_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.decimal_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) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
-
+
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to int, uint, long, ulong, double, float, decimal
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
-
+
} else if (expr_type == TypeManager.int32_type){
//
// From int to long, double, float, decimal
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
-
+
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to long, ulong, double, float, decimal
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
-
+
} else if ((expr_type == TypeManager.uint64_type) ||
(expr_type == TypeManager.int64_type)) {
//
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
-
+
} else if (expr_type == TypeManager.char_type){
//
// From char to ushort, int, uint, ulong, long, float, double, decimal
- //
+ //
if ((target_type == TypeManager.ushort_type) ||
(target_type == TypeManager.int32_type) ||
(target_type == TypeManager.uint32_type) ||
//
if (target_type == TypeManager.double_type)
return true;
- }
-
+ }
+
if (expr.eclass == ExprClass.MethodGroup){
if (TypeManager.IsDelegateType (target_type) && RootContext.Version != LanguageVersion.ISO_1){
MethodGroupExpr mg = expr as MethodGroupExpr;
if (mg != null){
- //
- // This should not happen frequently, so we can create an object
- // to test compatibility
- //
- Expression c = ImplicitDelegateCreation.Create (
- ec, mg, target_type, true, Location.Null);
- return c != null;
+ return DelegateCreation.ImplicitStandardConversionExists (mg, target_type) != null;
}
}
}
-
+
if (ImplicitReferenceConversionExists (expr, target_type))
return true;
if (value >= 0)
return true;
}
-
+
if (value == 0 && expr is IntLiteral && TypeManager.IsEnumType (target_type))
return true;
}
if (v >= 0)
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.IsInterface && target_type.IsAssignableFrom (expr_type))
return true;
if (!TypeManager.IsDelegateType (target_type))
return false;
- AnonymousMethod am = (AnonymousMethod) expr;
-
- Expression conv = am.Compatible (ec, target_type, true);
- if (conv != null)
- return true;
+ AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
+ return ame.ImplicitStandardConversionExists (target_type);
}
return false;
/// Finds "most encompassed type" according to the spec (13.4.2)
/// amongst the methods in the MethodGroupExpr
/// </summary>
- static Type FindMostEncompassedType (EmitContext ec, ArrayList types)
+ static Type FindMostEncompassedType (ArrayList types)
{
Type best = null;
}
expr.SetType (t);
- if (ImplicitStandardConversionExists (ec, expr, best))
+ if (ImplicitStandardConversionExists (expr, best))
best = t;
}
foreach (Type t in types) {
if (best == t)
continue;
- if (!ImplicitStandardConversionExists (ec, expr, t)) {
+ if (!ImplicitStandardConversionExists (expr, t)) {
best = null;
break;
}
return best;
}
-
+
/// <summary>
/// Finds "most encompassing type" according to the spec (13.4.2)
/// amongst the types in the given set
/// </summary>
- static Type FindMostEncompassingType (EmitContext ec, ArrayList types)
+ static Type FindMostEncompassingType (ArrayList types)
{
Type best = null;
}
expr.SetType (best);
- if (ImplicitStandardConversionExists (ec, expr, t))
+ if (ImplicitStandardConversionExists (expr, t))
best = t;
}
if (best == t)
continue;
expr.SetType (t);
- if (!ImplicitStandardConversionExists (ec, expr, best)) {
+ if (!ImplicitStandardConversionExists (expr, best)) {
best = null;
break;
}
/// by making use of FindMostEncomp* methods. Applies the correct rules separately
/// for explicit and implicit conversion operators.
/// </summary>
- static public Type FindMostSpecificSource (EmitContext ec, IList list,
- Expression source, bool apply_explicit_conv_rules,
- Location loc)
+ static public Type FindMostSpecificSource (IList list,
+ Expression source, bool apply_explicit_conv_rules)
{
ArrayList src_types_set = new ArrayList ();
-
+
//
// If any operator converts from S then Sx = S
//
src_types_set.Add (param_type);
}
-
+
//
// Explicit Conv rules
//
ArrayList candidate_set = new ArrayList ();
foreach (Type param_type in src_types_set){
- if (ImplicitStandardConversionExists (ec, source, param_type))
+ if (ImplicitStandardConversionExists (source, param_type))
candidate_set.Add (param_type);
}
if (candidate_set.Count != 0)
- return FindMostEncompassedType (ec, candidate_set);
+ return FindMostEncompassedType (candidate_set);
}
//
// Final case
//
if (apply_explicit_conv_rules)
- return FindMostEncompassingType (ec, src_types_set);
+ return FindMostEncompassingType (src_types_set);
else
- return FindMostEncompassedType (ec, src_types_set);
+ return FindMostEncompassedType (src_types_set);
}
-
+
/// <summary>
/// Finds the most specific target Tx according to section 13.4.4
/// </summary>
- static public Type FindMostSpecificTarget (EmitContext ec, IList list,
- Type target, bool apply_explicit_conv_rules,
- Location loc)
+ static public Type FindMostSpecificTarget (IList list,
+ Type target, bool apply_explicit_conv_rules)
{
ArrayList tgt_types_set = new ArrayList ();
-
+
//
// If any operator converts to T then Tx = T
//
foreach (Type ret_type in tgt_types_set){
expr.SetType (ret_type);
-
- if (ImplicitStandardConversionExists (ec, expr, target))
+
+ if (ImplicitStandardConversionExists (expr, target))
candidate_set.Add (ret_type);
}
EmptyExpression.Release (expr);
if (candidate_set.Count != 0)
- return FindMostEncompassingType (ec, candidate_set);
+ return FindMostEncompassingType (candidate_set);
}
-
+
//
// Okay, final case !
//
if (apply_explicit_conv_rules)
- return FindMostEncompassedType (ec, tgt_types_set);
- else
- return FindMostEncompassingType (ec, tgt_types_set);
+ return FindMostEncompassedType (tgt_types_set);
+ else
+ return FindMostEncompassingType (tgt_types_set);
}
-
+
/// <summary>
/// User-defined Implicit conversions
/// </summary>
return UserDefinedConversion (ec, source, target, loc, true);
}
- static void AddConversionOperators (EmitContext ec, ArrayList list,
- Expression source, Type target_type,
+ static void AddConversionOperators (ArrayList list,
+ Expression source, Type target_type,
bool look_for_explicit,
MethodGroupExpr mg)
{
Type arg_type = pd.ParameterType (0);
if (source_type != arg_type) {
- if (!ImplicitStandardConversionExists (ec, source, arg_type)) {
+ if (!ImplicitStandardConversionExists (source, arg_type)) {
if (!look_for_explicit)
continue;
expr.SetType (arg_type);
- if (!ImplicitStandardConversionExists (ec, expr, source_type))
+ if (!ImplicitStandardConversionExists (expr, source_type))
continue;
}
}
if (target_type != return_type) {
expr.SetType (return_type);
- if (!ImplicitStandardConversionExists (ec, expr, target_type)) {
+ if (!ImplicitStandardConversionExists (expr, target_type)) {
if (!look_for_explicit)
continue;
expr.SetType (target_type);
- if (!ImplicitStandardConversionExists (ec, expr, return_type))
+ if (!ImplicitStandardConversionExists (expr, return_type))
continue;
}
}
}
/// <summary>
- /// Computes the list of the user-defined conversion
- /// operators from source_type to target_type. `look_for_explicit'
- /// controls whether we should also include the list of explicit
- /// operators
+ /// 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 IList GetConversionOperators (EmitContext ec,
- Expression source, Type target_type,
- Location loc, bool look_for_explicit)
+ static MethodInfo GetConversionOperator (Type container_type, Expression source, Type target_type, bool look_for_explicit)
{
- ArrayList ret = new ArrayList (4);
+ ArrayList ops = new ArrayList (4);
Type source_type = source.Type;
if (source_type != TypeManager.decimal_type) {
- AddConversionOperators (ec, ret, source, target_type, look_for_explicit,
- Expression.MethodLookup (
- ec, source_type, "op_Implicit", loc) as MethodGroupExpr);
+ AddConversionOperators (ops, source, target_type, look_for_explicit,
+ Expression.MethodLookup (container_type, source_type, "op_Implicit", Location.Null) as MethodGroupExpr);
if (look_for_explicit) {
- AddConversionOperators (ec, ret, source, target_type, look_for_explicit,
+ AddConversionOperators (ops, source, target_type, look_for_explicit,
Expression.MethodLookup (
- ec, source_type, "op_Explicit", loc) as MethodGroupExpr);
+ container_type, source_type, "op_Explicit", Location.Null) as MethodGroupExpr);
}
}
if (target_type != TypeManager.decimal_type) {
- AddConversionOperators (ec, ret, source, target_type, look_for_explicit,
- Expression.MethodLookup (
- ec, target_type, "op_Implicit", loc) as MethodGroupExpr);
+ AddConversionOperators (ops, source, target_type, look_for_explicit,
+ Expression.MethodLookup (container_type, target_type, "op_Implicit", Location.Null) as MethodGroupExpr);
if (look_for_explicit) {
- AddConversionOperators (ec, ret, source, target_type, look_for_explicit,
+ AddConversionOperators (ops, source, target_type, look_for_explicit,
Expression.MethodLookup (
- ec, target_type, "op_Explicit", loc) as MethodGroupExpr);
+ container_type, target_type, "op_Explicit", Location.Null) as MethodGroupExpr);
}
}
- return ret;
+ if (ops.Count == 0)
+ return null;
+
+ Type most_specific_source = FindMostSpecificSource (ops, source, look_for_explicit);
+ if (most_specific_source == null)
+ return null;
+
+ Type most_specific_target = FindMostSpecificTarget (ops, target_type, look_for_explicit);
+ if (most_specific_target == null)
+ return null;
+
+ MethodInfo method = null;
+
+ foreach (MethodInfo m in ops) {
+ if (m.ReturnType != most_specific_target)
+ continue;
+ if (TypeManager.GetParameterData (m).ParameterType (0) != most_specific_source)
+ continue;
+ // Ambiguous: more than one conversion operator satisfies the signature.
+ if (method != null)
+ return null;
+ method = m;
+ }
+
+ return method;
}
static DoubleHash explicit_conv = new DoubleHash (100);
{
Type source_type = source.Type;
MethodInfo method = null;
- Type most_specific_source = null;
- Type most_specific_target = null;
object o;
DoubleHash hash = look_for_explicit ? explicit_conv : implicit_conv;
if (!(source is Constant) && hash.Lookup (source_type, target, out o)) {
method = (MethodInfo) o;
- if (method != null) {
- ParameterData pd = TypeManager.GetParameterData (method);
- most_specific_source = pd.ParameterType (0);
- most_specific_target = method.ReturnType;
- }
} else {
- IList ops = GetConversionOperators (ec, source, target, loc, look_for_explicit);
- if (ops == null || ops.Count == 0) {
- method = null;
- goto skip;
- }
-
- most_specific_source = FindMostSpecificSource (ec, ops, source, look_for_explicit, loc);
- if (most_specific_source == null) {
- method = null;
- goto skip;
- }
-
- most_specific_target = FindMostSpecificTarget (ec, ops, target, look_for_explicit, loc);
- if (most_specific_target == null) {
- method = null;
- goto skip;
- }
-
- int count = 0;
-
- foreach (MethodInfo m in ops) {
- ParameterData pd = TypeManager.GetParameterData (m);
-
- if (pd.ParameterType (0) == most_specific_source &&
- m.ReturnType == most_specific_target) {
- method = m;
- count++;
- }
- }
- if (count > 1)
- method = null;
-
- skip:
+ 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);
+
//
// This will do the conversion to the best match that we
// found. Now we need to perform an implict standard conversion
return e;
}
-
+
/// <summary>
/// Converts implicitly the resolved expression `expr' into the
/// `target_type'. It returns a new expression that can be used
- /// in a context that expects a `target_type'.
+ /// in a context that expects a `target_type'.
/// </summary>
static public Expression ImplicitConversion (EmitContext ec, Expression expr,
Type target_type, Location loc)
return null;
}
-
+
/// <summary>
/// Attempts to apply the `Standard Implicit
/// Conversion' rules to the expression `expr' into
/// `target_type'.
///
/// This is different from `ImplicitConversion' in that the
- /// user defined implicit conversions are excluded.
+ /// user defined implicit conversions are excluded.
/// </summary>
static public Expression ImplicitConversionStandard (EmitContext ec, Expression expr,
Type target_type, Location loc)
{
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)) {
+ Type target = TypeManager.GetTypeArguments (target_type) [0];
+ if (TypeManager.IsNullableType (expr.Type)) {
+ e = 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);
+ }
+ }
+#endif
if (expr.eclass == ExprClass.MethodGroup){
if (!TypeManager.IsDelegateType (target_type)){
return null;
}
-
+
//
// Only allow anonymous method conversions on post ISO_1
//
MethodGroupExpr mg = expr as MethodGroupExpr;
if (mg != null)
return ImplicitDelegateCreation.Create (
- ec, mg, target_type, false, loc);
+ ec, mg, target_type, loc);
}
}
- if (expr_type == target_type && expr_type != TypeManager.null_type)
+ if (expr_type.Equals (target_type) && !TypeManager.IsNullType (expr_type))
return expr;
- e = ImplicitNumericConversion (ec, expr, target_type, loc);
+ //
+ // 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);
if (e != null)
return e;
-
- if ((target_type == TypeManager.enum_type ||
- target_type.IsSubclassOf (TypeManager.enum_type)) &&
- expr is IntLiteral){
+
+ if (TypeManager.IsEnumType (target_type) && expr is IntLiteral){
IntLiteral i = (IntLiteral) expr;
-
+
if (i.Value == 0)
return new EnumConstant ((Constant) expr, 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 (target_type.IsPointer){
if (TypeManager.GetElementType(target_type) == TypeManager.GetElementType(expr_type))
return expr;
+
+ //return null;
}
}
-
- if (target_type.IsPointer) {
- if (expr_type == TypeManager.null_type)
- return new EmptyCast (NullPointer.Null, target_type);
- if (expr_type == TypeManager.void_ptr_type)
- return new EmptyCast (expr, target_type);
- }
+ if (expr_type == TypeManager.null_type && target_type.IsPointer)
+ 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;
- }
+ AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
- AnonymousMethod am = (AnonymousMethod) expr;
- int errors = Report.Errors;
-
- Expression conv = am.Compatible (ec, target_type, false);
- 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);
- }
-
- 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);
+ AnonymousMethod am = ame.Compatible (ec, target_type);
+ if (am != null)
+ return am.Resolve (ec);
}
- //
- // 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;
}
- static public void Error_CannotImplicitConversion (Location loc, Type source, Type target)
- {
- if (source.Name == target.Name){
- Report.ExtraInformation (loc,
- String.Format (
- "The type {0} has two conflicting definitions, one comes from {1} and the other from {2}",
- source.Name, source.Assembly.FullName, target.Assembly.FullName));
-
- }
-
- // TODO: Missing explicit numeric check
- //ExplicitNumericConversion
-
- if (ExplicitReferenceConversionExists (source, target)) {
- Report.Error (266, loc, "Cannot implicitly convert type `{0}' to `{1}'. An explicit conversion exists (are you missing a cast?)",
- TypeManager.CSharpName (source), TypeManager.CSharpName (target));
- return;
- }
-
- Report.Error (29, loc, "Cannot implicitly convert type {0} to `{1}'",
- source == TypeManager.anonymous_method_type ?
- "anonymous method" : "`" + TypeManager.CSharpName (source) + "'",
- TypeManager.CSharpName (target));
- }
-
/// <summary>
/// Attempts to implicitly convert `source' into `target_type', using
/// ImplicitConversion. If there is no implicit conversion, then
static public Expression ImplicitConversionRequired (EmitContext ec, Expression source,
Type target_type, Location loc)
{
- Expression e;
-
- e = ImplicitConversion (ec, source, target_type, loc);
+ Expression e = ImplicitConversion (ec, source, target_type, loc);
if (e != null)
return e;
- if (source is DoubleLiteral) {
- if (target_type == TypeManager.float_type) {
- Error_664 (loc, "float", "f");
- return null;
- }
- if (target_type == TypeManager.decimal_type) {
- Error_664 (loc, "decimal", "m");
- return null;
- }
- }
-
- source.Error_ValueCannotBeConverted (loc, target_type);
+ source.Error_ValueCannotBeConverted (ec, loc, target_type, false);
return null;
}
- static void Error_664 (Location loc, string type, string suffix) {
- Report.Error (664, loc,
- "Literal of type double cannot be implicitly converted to type `{0}'. Add suffix `{1}' to create a literal of this type",
- type, suffix);
- }
-
/// <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>
- static Expression ExplicitNumericConversion (EmitContext ec, Expression expr, Type target_type, Location loc)
+ public static Expression ExplicitNumericConversion (Expression expr, Type target_type)
{
Type expr_type = expr.Type;
-
- //
- // If we have an enumeration, extract the underlying type,
- // use this during the comparison, but wrap around the original
- // target_type
- //
Type real_target_type = target_type;
- if (TypeManager.IsEnumType (real_target_type))
- real_target_type = TypeManager.EnumToUnderlying (real_target_type);
-
- if (ImplicitStandardConversionExists (ec, expr, real_target_type)){
- Expression ce = ImplicitConversionStandard (ec, expr, real_target_type, loc);
-
- if (real_target_type != target_type)
- return new EmptyCast (ce, target_type);
- return ce;
- }
-
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 (ec, expr, target_type, ConvCast.Mode.I1_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_U1);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_U2);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_U4);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_CH);
+ 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
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U1_I1);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_CH);
+ 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 (ec, expr, target_type, ConvCast.Mode.I2_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_U1);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_U2);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_U4);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_CH);
+ 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
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U2_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U2_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U2_I2);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_CH);
+ 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 (ec, expr, target_type, ConvCast.Mode.I4_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_U2);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_U4);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_CH);
+ 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
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_I4);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_CH);
} else if (expr_type == TypeManager.int64_type){
//
// From long to sbyte, byte, short, ushort, int, uint, ulong, char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_I4);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_U4);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_CH);
} else if (expr_type == TypeManager.uint64_type){
//
// From ulong to sbyte, byte, short, ushort, int, uint, long, char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I4);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_U4);
if (real_target_type == TypeManager.int64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_CH);
+ 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
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.CH_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.CH_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.CH_I2);
} else if (expr_type == TypeManager.float_type){
//
// From float to sbyte, byte, short,
// or decimal
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_I4);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_U4);
if (real_target_type == TypeManager.int64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_I8);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_CH);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr, true);
+ return new CastToDecimal (expr, true);
} else if (expr_type == TypeManager.double_type){
//
// From double to sbyte, byte, short,
// char, float or decimal
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_I4);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_U4);
if (real_target_type == TypeManager.int64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_I8);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_CH);
if (real_target_type == TypeManager.float_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_R4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_R4);
if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (ec, expr, true);
- } else if (expr_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
//
- // From decimal to sbyte, byte, short, ushort, int, uint,
- // long, ulong, char, double or float
- //
- if (real_target_type == TypeManager.sbyte_type ||
- real_target_type == TypeManager.byte_type ||
- real_target_type == TypeManager.short_type ||
- real_target_type == TypeManager.ushort_type ||
- real_target_type == TypeManager.int32_type ||
- real_target_type == TypeManager.uint32_type ||
- real_target_type == TypeManager.int64_type ||
- real_target_type == TypeManager.uint64_type ||
- real_target_type == TypeManager.char_type ||
- real_target_type == TypeManager.double_type ||
- real_target_type == TypeManager.float_type)
- return new CastFromDecimal (ec, expr, target_type);
+ 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 null;
}
/// </summary>
public static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
{
+ bool target_is_type_param = TypeManager.IsGenericParameter (target_type);
bool target_is_value_type = target_type.IsValueType;
-
+
if (source_type == target_type)
return true;
-
+
+ //
+ // From generic parameter to any type
+ //
+ if (TypeManager.IsGenericParameter (source_type))
+ return ExplicitTypeParameterConversionExists (source_type, target_type);
+
+ //
+ // From object to a generic parameter
+ //
+ if (source_type == TypeManager.object_type && target_is_type_param)
+ return true;
+
//
// From object to any reference type
//
if (source_type == TypeManager.object_type && !target_is_value_type)
return true;
-
+
//
// From any class S to any class-type T, provided S is a base class of T
//
- if (target_type.IsSubclassOf (source_type))
+ if (TypeManager.IsSubclassOf (target_type, source_type))
return true;
//
// From any interface type S to any interface T provided S is not derived from T
//
if (source_type.IsInterface && target_type.IsInterface){
- if (!target_type.IsSubclassOf (source_type))
+ if (!TypeManager.IsSubclassOf (target_type, source_type))
return true;
}
-
+
//
// From any class type S to any interface T, provided S is not sealed
// and provided S does not implement T.
if (source_type.IsInterface &&
(!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type)))
return true;
-
-
- // From an array type S with an element type Se to an array type T with an
+
+
+ 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
// have the same number of dimensions.
//
if (source_type.IsArray && target_type.IsArray) {
if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
-
+
Type source_element_type = TypeManager.GetElementType (source_type);
Type target_element_type = TypeManager.GetElementType (target_type);
-
- if (!source_element_type.IsValueType && !target_element_type.IsValueType)
+
+ if (TypeManager.IsGenericParameter (source_element_type) ||
+ (!source_element_type.IsValueType && !target_element_type.IsValueType))
if (ExplicitReferenceConversionExists (source_element_type,
target_element_type))
return true;
}
}
-
+
// From System.Array to any array-type
if (source_type == TypeManager.array_type &&
// From System delegate to any delegate-type
//
if (source_type == TypeManager.delegate_type &&
- target_type.IsSubclassOf (TypeManager.delegate_type))
+ TypeManager.IsDelegateType (target_type))
return true;
//
(target_type == TypeManager.array_type ||
target_type == TypeManager.delegate_type))
return true;
-
+
return false;
}
static Expression ExplicitReferenceConversion (Expression source, Type target_type)
{
Type source_type = source.Type;
+ bool target_is_type_param = TypeManager.IsGenericParameter (target_type);
bool target_is_value_type = target_type.IsValueType;
+ //
+ // From object to a generic parameter
+ //
+ if (source_type == TypeManager.object_type && target_is_type_param)
+ return new UnboxCast (source, target_type);
+
+ //
+ // Explicit type parameter conversion.
+ //
+
+ if (TypeManager.IsGenericParameter (source_type))
+ return ExplicitTypeParameterConversion (source, target_type);
+
//
// From object to any reference type
//
//
// From any class S to any class-type T, provided S is a base class of T
//
- if (target_type.IsSubclassOf (source_type))
+ if (TypeManager.IsSubclassOf (target_type, source_type))
return new ClassCast (source, target_type);
//
else
return new ClassCast (source, target_type);
}
-
+
//
// From any class type S to any interface T, provides S is not sealed
// and provided S does not implement T.
return null;
else
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;
}
-
- // From an array type S with an element type Se to an array type T with an
+
+ // 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
// have the same number of dimensions.
//
if (source_type.IsArray && target_type.IsArray) {
if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
-
+
Type source_element_type = TypeManager.GetElementType (source_type);
Type target_element_type = TypeManager.GetElementType (target_type);
-
+
if (!source_element_type.IsValueType && !target_element_type.IsValueType)
if (ExplicitReferenceConversionExists (source_element_type,
target_element_type))
return new ClassCast (source, target_type);
}
}
-
+
// From System.Array to any array-type
if (source_type == TypeManager.array_type &&
// From System delegate to any delegate-type
//
if (source_type == TypeManager.delegate_type &&
- target_type.IsSubclassOf (TypeManager.delegate_type))
+ TypeManager.IsDelegateType (target_type))
return new ClassCast (source, target_type);
//
(target_type == TypeManager.array_type ||
target_type == TypeManager.delegate_type))
return new ClassCast (source, target_type);
-
+
return null;
}
-
+
/// <summary>
/// Performs an explicit conversion of the expression `expr' whose
/// type is expr.Type to `target_type'.
/// </summary>
- static public Expression ExplicitConversion (EmitContext ec, Expression expr,
- Type target_type, Location loc)
+ static public Expression ExplicitConversionCore (EmitContext ec, Expression expr,
+ Type target_type, Location loc)
{
Type expr_type = expr.Type;
- Type original_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);
-
if (ne != null)
return ne;
- if (expr_type.IsSubclassOf (TypeManager.enum_type)){
- if ((expr_type == TypeManager.enum_type) && target_type.IsValueType &&
- target_type.IsSubclassOf (TypeManager.enum_type))
+ //
+ // Unboxing conversions; only object types can be convertible to enum
+ //
+ if (expr_type == TypeManager.object_type && target_type.IsValueType)
+ return new UnboxCast (expr, target_type);
+
+ if (TypeManager.IsEnumType (expr_type)) {
+ Expression underlying = EmptyCast.Create (expr, TypeManager.EnumToUnderlying (expr_type));
+ expr = ExplicitConversionCore (ec, underlying, target_type, loc);
+ if (expr != null)
+ return expr;
+
+ return ExplicitUserConversion (ec, underlying, target_type, loc);
+ }
+
+ if (TypeManager.IsEnumType (target_type)){
+ if (expr_type == TypeManager.enum_type)
return new UnboxCast (expr, target_type);
+ Expression ce = ExplicitConversionCore (ec, expr, TypeManager.EnumToUnderlying (target_type), loc);
+ if (ce != null)
+ return EmptyCast.Create (ce, target_type);
+
//
- // Notice that we have kept the expr_type unmodified, which is only
- // used later on to
- if (expr is EnumConstant)
- expr = ((EnumConstant) expr).Child;
- else
- expr = new EmptyCast (expr, TypeManager.EnumToUnderlying (expr_type));
- expr_type = expr.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 (ec, expr, target_type, loc);
+ ne = ExplicitNumericConversion (expr, target_type);
if (ne != null)
return ne;
- //
- // Unboxing conversion.
- //
- if (expr_type == TypeManager.object_type && target_type.IsValueType)
- return new UnboxCast (expr, target_type);
-
//
// Skip the ExplicitReferenceConversion because we can not convert
// from Null to a ValueType, and ExplicitReference wont check against
}
if (ec.InUnsafe){
- if (target_type.IsPointer){
- if (expr_type.IsPointer)
- return new EmptyCast (expr, target_type);
-
- if (expr_type == TypeManager.sbyte_type ||
- expr_type == TypeManager.short_type ||
- expr_type == TypeManager.int32_type ||
- expr_type == TypeManager.int64_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.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
- }
- if (expr_type.IsPointer){
- Expression e = null;
-
- if (target_type == TypeManager.sbyte_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- else if (target_type == TypeManager.byte_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- else if (target_type == TypeManager.short_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- else if (target_type == TypeManager.ushort_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- else if (target_type == TypeManager.int32_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- else if (target_type == TypeManager.uint32_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- else if (target_type == TypeManager.uint64_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- else if (target_type == TypeManager.int64_type){
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- }
-
- if (e != null){
- Expression ci, ce;
+ ne = ExplicitUnsafe (expr, target_type);
+ if (ne != null)
+ return ne;
+ }
+
+ return null;
+ }
- ci = ImplicitConversionStandard (ec, e, target_type, loc);
+ public static Expression ExplicitUnsafe (Expression expr, Type target_type)
+ {
+ Type expr_type = expr.Type;
- if (ci != null)
- return ci;
+ if (target_type.IsPointer){
+ if (expr_type.IsPointer)
+ 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)
+ 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.byte_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
+ }
- ce = ExplicitNumericConversion (ec, e, target_type, loc);
- if (ce != null)
- return ce;
- //
- // We should always be able to go from an uint32
- // implicitly or explicitly to the other integral
- // types
- //
- throw new Exception ("Internal compiler error");
- }
+ if (expr_type.IsPointer){
+ if (target_type == TypeManager.sbyte_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
+ else if (target_type == TypeManager.byte_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
+ else if (target_type == TypeManager.short_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
+ else if (target_type == TypeManager.ushort_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ else if (target_type == TypeManager.int32_type)
+ 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)
+ 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);
}
}
-
- ne = ExplicitUserConversion (ec, expr, target_type, loc);
- if (ne != null)
- return ne;
-
- if (expr is Constant)
- expr.Error_ValueCannotBeConverted (loc, target_type);
- else
- Error_CannotConvertType (loc, original_expr_type, target_type);
return null;
}
/// Same as ExplicitConversion, only it doesn't include user defined conversions
/// </summary>
static public Expression ExplicitConversionStandard (EmitContext ec, Expression expr,
- Type target_type, Location l)
+ Type target_type, Location l)
{
+ int errors = Report.Errors;
Expression ne = ImplicitConversionStandard (ec, expr, target_type, l);
+ if (Report.Errors > errors)
+ return null;
if (ne != null)
return ne;
- ne = ExplicitNumericConversion (ec, expr, target_type, l);
+ ne = ExplicitNumericConversion (expr, target_type);
if (ne != null)
return ne;
if (ne != null)
return ne;
- Error_CannotConvertType (l, expr.Type, target_type);
+ if (ec.InUnsafe && expr.Type == TypeManager.void_ptr_type && target_type.IsPointer)
+ return EmptyCast.Create (expr, target_type);
+
+ expr.Error_ValueCannotBeConverted (ec, l, target_type, true);
+ return null;
+ }
+
+ /// <summary>
+ /// Performs an explicit conversion of the expression `expr' whose
+ /// type is expr.Type to `target_type'.
+ /// </summary>
+ static public Expression ExplicitConversion (EmitContext ec, Expression expr,
+ Type target_type, Location loc)
+ {
+ Expression e;
+#if GMCS_SOURCE
+ Type expr_type = expr.Type;
+ if (TypeManager.IsNullableType (target_type)) {
+ if (TypeManager.IsNullableType (expr_type)) {
+ e = new Nullable.LiftedConversion (
+ expr, target_type, false, true, loc).Resolve (ec);
+ if (e != null)
+ return e;
+ } else if (expr_type == TypeManager.object_type) {
+ return new UnboxCast (expr, target_type);
+ } else {
+ Type target = TypeManager.GetTypeArguments (target_type) [0];
+
+ e = ExplicitConversionCore (ec, expr, target, loc);
+ if (e != null)
+ return Nullable.Wrap.Create (e, ec);
+ }
+ } else if (TypeManager.IsNullableType (expr_type)) {
+ Expression source = Nullable.Unwrap.Create (expr, ec);
+ if (source != null) {
+ 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