// 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
// from S to T.
//
- static bool Array_To_IList (Type array, Type list)
+ static bool Array_To_IList (Type array, Type list, bool isExplicit)
{
#if GMCS_SOURCE
- if (!array.IsArray || (array.GetArrayRank () != 1) || !list.IsGenericType)
+ if ((array.GetArrayRank () != 1) || !list.IsGenericType)
return false;
Type gt = list.GetGenericTypeDefinition ();
if (element_type == arg_type)
return true;
+ if (isExplicit)
+ return ExplicitReferenceConversionExists (element_type, arg_type);
+
if (MyEmptyExpr == null)
MyEmptyExpr = new EmptyExpression ();
MyEmptyExpr.SetType (TypeManager.GetElementType (array));
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)
- return true;
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (expr_type);
- if (TypeManager.IsGenericParameter (target_type)) {
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (target_type);
- if (gc == null)
- return false;
+ if (gc == null) {
+ use_class_cast = false;
+ return target_type == TypeManager.object_type;
+ }
- foreach (Type iface in gc.InterfaceConstraints) {
- if (!TypeManager.IsGenericParameter (iface))
- continue;
+ use_class_cast = true;
- if (TypeManager.IsSubclassOf (source_type, iface))
+ 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 Expression ExplicitTypeParameterConversion (Expression source, Type target_type)
+ static Expression ExplicitTypeParameterConversion (Expression source, Type source_type, 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)
continue;
if (TypeManager.IsSubclassOf (source_type, iface))
- return new ClassCast (source, target_type);
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
}
}
+
+ if (target_type.IsInterface)
+ return source == null ? EmptyExpression.Null : 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.ConvertImplicitly(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;
- }
-
- // 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 (expr_type.IsArray) {
+ // from an array-type S to an array-type of type T
+ if (target_type.IsArray && expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
+ //
+ // Both SE and TE are reference-types
+ //
Type expr_element_type = TypeManager.GetElementType (expr_type);
+ if (!TypeManager.IsReferenceType (expr_element_type))
+ return false;
+
+ Type target_element_type = TypeManager.GetElementType (target_type);
+ if (!TypeManager.IsReferenceType (target_element_type))
+ return false;
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 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);
+ // from an array-type to System.Array
+ if (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 new EmptyCast (expr, target_type);
+ // from an array-type of type T to IList<T>
+ if (Array_To_IList (expr_type, target_type, false))
+ return true;
- // from any delegate type to System.Delegate
- if ((expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type)) &&
- target_type == TypeManager.delegate_type)
- return new EmptyCast (expr, target_type);
+ return false;
+ }
- // from any array-type or delegate type into System.ICloneable.
- if (expr_type.IsArray ||
- expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type))
- if (target_type == TypeManager.icloneable_type)
- return new EmptyCast (expr, target_type);
+ // from any interface type S to interface-type T.
+ if (expr_type.IsInterface && target_type.IsInterface) {
+ return TypeManager.ImplementsInterface (expr_type, target_type);
+ }
+
+ // from any delegate type to System.Delegate
+ 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;
}
//
// 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;
}
if (expr_type == TypeManager.void_type)
return false;
+ if (expr.eclass == ExprClass.MethodGroup) {
+ if (TypeManager.IsDelegateType (target_type) && RootContext.Version != LanguageVersion.ISO_1) {
+ MethodGroupExpr mg = expr as MethodGroupExpr;
+ if (mg != null) {
+ return DelegateCreation.ImplicitStandardConversionExists (mg, target_type) != null;
+ }
+ }
+
+ return false;
+ }
+
//Console.WriteLine ("Expr is {0}", expr);
//Console.WriteLine ("{0} -> {1} ?", expr_type, target_type);
if (TypeManager.IsEqual (expr_type, target_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){
- return DelegateCreation.ImplicitStandardConversionExists (mg, target_type) != null;
- }
- }
- }
-
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
//
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;
-
- AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
- return ame.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);
}
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;
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).DoResolve (ec);
}
/// <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
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 (new NullPointer (loc), target_type);
}
if (expr_type == TypeManager.anonymous_method_type){
AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
-
- int errors = Report.Errors;
-
- Expression conv = ame.Compatible (ec, target_type);
- if (conv != null)
- return conv;
-
- //
- // We return something instead of null, to avoid
- // the duplicate error, since am.Compatible would have
- // reported that already
- //
- if (errors != Report.Errors)
- return new EmptyCast (expr, target_type);
+ Expression am = ame.Compatible (ec, target_type);
+ if (am != null)
+ return am.DoResolve (ec);
}
return null;
// One of the built-in conversions that belonged in the class library
if (real_target_type == TypeManager.intptr_type){
- return new OperatorCast (new EmptyCast (expr, TypeManager.int64_type),
+ return new OperatorCast (EmptyCast.Create (expr, TypeManager.int64_type),
TypeManager.intptr_type, true);
}
} else if (expr_type == TypeManager.char_type){
return new ConvCast (uint32e, TypeManager.sbyte_type, ConvCast.Mode.U4_I2);
}
if (real_target_type == TypeManager.int32_type){
- return new EmptyCast (new OperatorCast (expr, TypeManager.uint32_type, true),
+ return EmptyCast.Create (new OperatorCast (expr, TypeManager.uint32_type, true),
TypeManager.int32_type);
}
} else if (expr_type == TypeManager.intptr_type){
if (real_target_type == TypeManager.uint64_type){
- return new EmptyCast (new OperatorCast (expr, TypeManager.int64_type, true),
+ return EmptyCast.Create (new OperatorCast (expr, TypeManager.int64_type, true),
TypeManager.uint64_type);
}
} else if (expr_type == TypeManager.decimal_type) {
/// </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 (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 (!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 (target_type.IsInterface && !source_type.IsSealed &&
- !TypeManager.ImplementsInterface (source_type, target_type))
- return true;
-
- //
- // From any interface-type S to to any class type T, provided T is not
- // sealed, or provided T implements S.
- //
- if (source_type.IsInterface &&
- (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type)))
- 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
- // have the same number of dimensions.
- // * Both Se and Te are reference types
- // * An explicit referenc conversions exist from Se to Te
- //
- 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 (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 &&
- target_type.IsArray){
- return true;
- }
-
- //
- // From System delegate to any delegate-type
- //
- if (source_type == TypeManager.delegate_type &&
- TypeManager.IsDelegateType (target_type))
- return true;
+ Expression e = ExplicitReferenceConversion (null, source_type, target_type);
+ if (e == null)
+ return false;
- //
- // From ICloneable to Array or Delegate types
- //
- if (source_type == TypeManager.icloneable_type &&
- (target_type == TypeManager.array_type ||
- target_type == TypeManager.delegate_type))
+ if (e == EmptyExpression.Null)
return true;
- return false;
+ throw new InternalErrorException ("Invalid probing conversion result");
}
/// <summary>
/// Implements Explicit Reference conversions
/// </summary>
- static Expression ExplicitReferenceConversion (Expression source, Type target_type)
+ static Expression ExplicitReferenceConversion (Expression source, Type source_type, 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);
+ if (source_type == TypeManager.object_type && TypeManager.IsGenericParameter (target_type))
+ return source == null ? EmptyExpression.Null : new UnboxCast (source, target_type);
//
// Explicit type parameter conversion.
//
-
if (TypeManager.IsGenericParameter (source_type))
- return ExplicitTypeParameterConversion (source, target_type);
+ return ExplicitTypeParameterConversion (source, source_type, target_type);
//
// From object to any reference type
//
if (source_type == TypeManager.object_type && !target_is_value_type)
- return new ClassCast (source, target_type);
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
//
// 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);
+ return source == null ? EmptyExpression.Null : new UnboxCast (source, target_type);
//
// From any class S to any class-type T, provided S is a base class of T
//
if (TypeManager.IsSubclassOf (target_type, source_type))
- return new ClassCast (source, target_type);
-
- //
- // From any interface type S to any interface T provided S is not derived from T
- //
- if (source_type.IsInterface && target_type.IsInterface){
- if (TypeManager.ImplementsInterface (source_type, target_type))
- return null;
- else
- return new ClassCast (source, target_type);
- }
+ return source == null ? EmptyExpression.Null : 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.
//
- 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 &&
+ !TypeManager.ImplementsInterface (source_type, target_type)) {
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
}
//
if (source_type.IsInterface) {
if (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type)) {
if (target_type.IsClass)
- return new ClassCast (source, target_type);
- else
- return new UnboxCast (source, target_type);
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
+
+ return source == null ? EmptyExpression.Null : new UnboxCast (source, target_type);
}
//
// 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 source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
return null;
}
- // 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.
- // * Both Se and Te are reference types
- // * An explicit referenc conversions exist from Se to Te
- //
- if (source_type.IsArray && target_type.IsArray) {
- if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
+ if (source_type.IsArray) {
+ if (target_type.IsArray) {
+ //
+ // From System.Array to any array-type
+ //
+ if (source_type == TypeManager.array_type)
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
- Type source_element_type = TypeManager.GetElementType (source_type);
- Type target_element_type = TypeManager.GetElementType (target_type);
+ //
+ // 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.
+ // * Both Se and Te are reference types
+ // * An explicit reference conversions exist from Se to Te
+ //
+ if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
- if (!source_element_type.IsValueType && !target_element_type.IsValueType)
- if (ExplicitReferenceConversionExists (source_element_type,
- target_element_type))
- return new ClassCast (source, target_type);
+ source_type = TypeManager.GetElementType (source_type);
+ if (!TypeManager.IsReferenceType (source_type))
+ return null;
+
+ Type target_type_element = TypeManager.GetElementType (target_type);
+ if (!TypeManager.IsReferenceType (target_type_element))
+ return null;
+
+ if (ExplicitReferenceConversionExists (source_type, target_type_element))
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
+
+ return null;
+ }
}
- }
+ //
+ // From a single-dimensional array type S[] to System.Collections.Generic.IList<T> and its base interfaces,
+ // provided that there is an explicit reference conversion from S to T
+ //
+ if (Array_To_IList (source_type, target_type, true))
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
- // From System.Array to any array-type
- if (source_type == TypeManager.array_type &&
- target_type.IsArray) {
- return new ClassCast (source, target_type);
+ return null;
}
//
// From System delegate to any delegate-type
//
- if (source_type == TypeManager.delegate_type &&
- 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);
+ if (source_type == TypeManager.delegate_type && TypeManager.IsDelegateType (target_type))
+ return source == null ? EmptyExpression.Null : 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;
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)){
if (expr_type == TypeManager.enum_type)
return new UnboxCast (expr, target_type);
- Expression ce = ExplicitConversionCore (ec, expr, TypeManager.EnumToUnderlying (target_type), loc);
+ 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);
// null literal explicitly
//
if (expr_type != TypeManager.null_type){
- ne = ExplicitReferenceConversion (expr, target_type);
+ ne = ExplicitReferenceConversion (expr, expr_type, target_type);
if (ne != null)
return ne;
}
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;
}
if (ne != null)
return ne;
- ne = ExplicitReferenceConversion (expr, target_type);
+ ne = ExplicitReferenceConversion (expr, expr.Type, target_type);
if (ne != 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 (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 (ec, loc, target_type, true);
return null;
projects / mono.git / blobdiff