// 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.
//
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Reflection;
+using System.Reflection.Emit;
+
namespace Mono.CSharp {
- using System;
- using System.Collections;
- using System.Diagnostics;
- using System.Reflection;
- using System.Reflection.Emit;
//
// A container class for all the conversion operations
//
- public class Convert {
-#if GMCS_SOURCE
- static bool TypeParameter_to_Null (Type target_type)
+ static class Convert {
+
+ static EmptyExpression MyEmptyExpr;
+ static DoubleHash explicit_conv;
+ static DoubleHash implicit_conv;
+
+ static Convert ()
{
- 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;
+ Reset ();
}
-
+
+ public static void Reset ()
+ {
+ MyEmptyExpr = null;
+ explicit_conv = new DoubleHash (100);
+ implicit_conv = new DoubleHash (100);
+ }
+
static Type TypeParam_EffectiveBaseType (GenericConstraints gc)
{
- ArrayList list = new ArrayList ();
+ var list = new List<Type> ();
list.Add (gc.EffectiveBaseClass);
foreach (Type t in gc.InterfaceConstraints) {
if (!TypeManager.IsGenericParameter (t))
}
return FindMostEncompassedType (list);
}
-#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) || !TypeManager.IsGenericType (list))
return false;
- Type gt = list.GetGenericTypeDefinition ();
+ Type gt = TypeManager.DropGenericTypeArguments (list);
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];
+ Type arg_type = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (list) [0]);
if (element_type == arg_type)
return true;
+ if (isExplicit)
+ return ExplicitReferenceConversionExists (element_type, arg_type);
+
+ Type t = TypeManager.GetElementType (array);
if (MyEmptyExpr == null)
- MyEmptyExpr = new EmptyExpression ();
- MyEmptyExpr.SetType (TypeManager.GetElementType (array));
+ MyEmptyExpr = new EmptyExpression (t);
+ else
+ MyEmptyExpr.SetType (t);
- return ImplicitReferenceConversionCore (MyEmptyExpr, arg_type);
-#else
- return false;
-#endif
+ return ImplicitReferenceConversionExists (MyEmptyExpr, arg_type);
}
static bool IList_To_Array(Type list, Type array)
{
-# if GMCS_SOURCE
- if (!list.IsGenericType || !array.IsArray || array.GetArrayRank() != 1)
+ if (!TypeManager.IsGenericType (list) || !array.IsArray || array.GetArrayRank() != 1)
return false;
- Type gt = list.GetGenericTypeDefinition();
+ Type gt = TypeManager.DropGenericTypeArguments (list);
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 arg_type = TypeManager.TypeToCoreType (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);
+ MyEmptyExpr = new EmptyExpression(element_type);
+ else
+ 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 (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) {
if (TypeManager.ImplementsInterface (t, target_type))
return true;
}
-#endif
use_class_cast = false;
return false;
}
- static bool ExplicitTypeParameterConversionExists (Type source_type, Type target_type)
+ static Expression ExplicitTypeParameterConversion (Expression source, 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;
+ return null;
foreach (Type iface in gc.InterfaceConstraints) {
if (!TypeManager.IsGenericParameter (iface))
continue;
if (TypeManager.IsSubclassOf (source_type, iface))
- return true;
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type, 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);
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type, true);
- 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;
- 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;
//
NullLiteral nl = expr as NullLiteral;
if (nl != null) {
- return nl.ConvertImplicitly(target_type);
+ return nl.ConvertImplicitly (null, target_type);
}
- if (ImplicitReferenceConversionCore (expr, target_type))
+ if (ImplicitReferenceConversionExists (expr, target_type)) {
+ //
+ // Avoid wrapping implicitly convertible reference type
+ //
+ if (!explicit_cast)
+ return expr;
+
return EmptyCast.Create (expr, target_type);
+ }
bool use_class_cast;
if (ImplicitBoxingConversionExists (expr, target_type, out use_class_cast)) {
return null;
}
- static public bool ImplicitReferenceConversionCore (Expression expr, Type target_type)
+ //
+ // 6.1.6 Implicit reference conversions
+ //
+ public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
{
+ if (TypeManager.IsStruct (target_type))
+ return false;
+
Type expr_type = expr.Type;
+ // from the null type to any reference-type.
+ if (expr_type == TypeManager.null_type)
+ return target_type != InternalType.AnonymousMethod;
+
+ 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.
//
- if (target_type == TypeManager.object_type) {
+ if (target_type == TypeManager.object_type || TypeManager.IsDynamicType (target_type)) {
//
// A pointer type cannot be converted to object
//
if (TypeManager.IsValueType (expr_type))
return false;
+
if (expr_type.IsClass || expr_type.IsInterface || expr_type == TypeManager.enum_type){
- return expr_type != TypeManager.anonymous_method_type;
+ // No mcs internal types are convertible
+ return expr_type.Module != typeof (Convert).Module;
}
return false;
}
}
- // from any interface type S to interface-type T.
- if (expr_type.IsInterface && target_type.IsInterface) {
- 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 (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;
- if (MyEmptyExpr == null)
- MyEmptyExpr = new EmptyExpression ();
-
- MyEmptyExpr.SetType (expr_element_type);
Type target_element_type = TypeManager.GetElementType (target_type);
+ if (!TypeManager.IsReferenceType (target_element_type))
+ return false;
- if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
- return ImplicitStandardConversionExists (
- MyEmptyExpr, target_element_type);
+ if (MyEmptyExpr == null)
+ MyEmptyExpr = new EmptyExpression (expr_element_type);
+ else
+ MyEmptyExpr.SetType (expr_element_type);
+
+ return ImplicitStandardConversionExists (MyEmptyExpr, target_element_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 (Array_To_IList (expr_type, target_type, false))
+ return true;
+
+ return false;
}
- // from an array-type to System.Array
- if (expr_type.IsArray && target_type == TypeManager.array_type)
+ if (TypeManager.IsVariantOf (expr_type, 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 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 true;
return false;
}
- static public bool ImplicitBoxingConversionExists (Expression expr, Type target_type,
+ public static bool ImplicitBoxingConversionExists (Expression expr, Type target_type,
out bool use_class_cast)
{
Type expr_type = expr.Type;
//
// From any value-type to the type object.
//
- if (target_type == TypeManager.object_type) {
+ if (target_type == TypeManager.object_type || TypeManager.IsDynamicType (target_type)) {
//
// A pointer type cannot be converted to object
//
//
// From any enum-type to the type System.Enum.
//
- if (expr_type.IsEnum)
+ if (TypeManager.IsEnumType (expr_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;
+ return TypeManager.IsEnumType (TypeManager.GetTypeArguments (expr_type) [0]);
}
-
+
if (TypeManager.IsSubclassOf (expr_type, target_type)) {
- if (TypeManager.IsGenericParameter (expr_type))
+ //
+ // Don't box same type arguments
+ //
+ if (TypeManager.IsGenericParameter (expr_type) && expr_type != target_type)
return true;
return false;
return false;
}
- //
- // Tests whether an implicit reference conversion exists between expr_type
- // and target_type
- //
- public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
+ public static Expression ImplicitNulableConversion (ResolveContext ec, 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 true;
+ //
+ // From null to any nullable type
+ //
+ if (expr_type == TypeManager.null_type)
+ return ec == null ? EmptyExpression.Null : Nullable.LiftedNull.Create (target_type, expr.Location);
+
+ // S -> T?
+ Type t_el = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (target_type)[0]);
+
+ // S? -> T?
+ if (TypeManager.IsNullableType (expr_type))
+ expr_type = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (expr_type)[0]);
+
+ //
+ // Predefined implicit identity or implicit numeric conversion
+ // has to exist between underlying type S and underlying type T
+ //
+
+ // Handles probing
+ if (ec == null) {
+ if (expr_type == t_el)
+ return EmptyExpression.Null;
+
+ return ImplicitNumericConversion (null, expr_type, t_el);
}
- if (TypeManager.IsGenericParameter (expr_type))
- return ImplicitTypeParameterConversion (expr, target_type) != null;
+ Expression unwrap;
+ if (expr_type != expr.Type)
+ unwrap = Nullable.Unwrap.Create (expr);
+ else
+ unwrap = expr;
- bool use_class_cast;
- if (ImplicitReferenceConversionCore (expr, target_type) ||
- ImplicitBoxingConversionExists (expr, target_type, out use_class_cast))
- return true;
+ Expression conv = expr_type == t_el ? unwrap : ImplicitNumericConversion (unwrap, expr_type, t_el);
+ if (conv == null)
+ return null;
- return false;
+ if (expr_type != expr.Type)
+ return new Nullable.Lifted (conv, unwrap, target_type).Resolve (ec);
+
+ // Do constant optimization for S -> T?
+ if (unwrap is Constant)
+ conv = ((Constant) unwrap).ConvertImplicitly (ec, t_el);
+
+ return Nullable.Wrap.Create (conv, target_type);
}
/// <summary>
/// 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 (Expression expr,
- Type target_type)
+ public static Expression ImplicitNumericConversion (Expression expr, Type target_type)
{
- Type expr_type = expr.Type;
- Type real_target_type = target_type;
+ return ImplicitNumericConversion (expr, expr.Type, target_type);
+ }
+ static Expression ImplicitNumericConversion (Expression expr, Type expr_type, Type target_type)
+ {
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to short, int, long, float, double, decimal
//
- 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)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- if (real_target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- 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 (expr);
+ if (target_type == TypeManager.int32_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
+ if (target_type == TypeManager.int64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.short_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : 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 EmptyCast.Create (expr, target_type);
+ if (target_type == TypeManager.int32_type || target_type == TypeManager.uint32_type ||
+ target_type == TypeManager.short_type || target_type == TypeManager.ushort_type)
+ return expr == null ? EmptyExpression.Null : 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)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (real_target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- 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 (expr);
+ if (target_type == TypeManager.uint64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
+ if (target_type == TypeManager.int64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : 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 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)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- 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 (expr);
+ if (target_type == TypeManager.int32_type)
+ return expr == null ? EmptyExpression.Null : EmptyCast.Create (expr, target_type);
+ if (target_type == TypeManager.int64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : 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 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)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- 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 (expr);
+ if (target_type == TypeManager.int32_type || target_type == TypeManager.uint32_type)
+ return expr == null ? EmptyExpression.Null : EmptyCast.Create (expr, target_type);
+
+ if (target_type == TypeManager.uint64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
+ if (target_type == TypeManager.int64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : new CastToDecimal (expr);
} else if (expr_type == TypeManager.int32_type){
//
// From int to long, float, double, decimal
//
- if (real_target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (real_target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- 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 (expr);
+ if (target_type == TypeManager.int64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : new CastToDecimal (expr);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to long, ulong, float, double, decimal
//
- if (real_target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- 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);
- if (real_target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R4);
- if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (expr);
+ if (target_type == TypeManager.int64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
+ if (target_type == TypeManager.uint64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un), target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un), target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : new CastToDecimal (expr);
} else if (expr_type == TypeManager.int64_type){
//
// From long/ulong to float, double
//
- if (real_target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- 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 (expr);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : new CastToDecimal (expr);
} else if (expr_type == TypeManager.uint64_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);
- if (real_target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R4);
- if (real_target_type == TypeManager.decimal_type)
- return new CastToDecimal (expr);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un), target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un), target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : 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 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)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (real_target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- 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 (expr);
+ if ((target_type == TypeManager.ushort_type) ||
+ (target_type == TypeManager.int32_type) ||
+ (target_type == TypeManager.uint32_type))
+ return expr == null ? EmptyExpression.Null : EmptyCast.Create (expr, target_type);
+ if (target_type == TypeManager.uint64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
+ if (target_type == TypeManager.int64_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
+ if (target_type == TypeManager.float_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.decimal_type)
+ return expr == null ? EmptyExpression.Null : new CastToDecimal (expr);
} else if (expr_type == TypeManager.float_type){
//
// float to double
//
- if (real_target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (target_type == TypeManager.double_type)
+ return expr == null ? EmptyExpression.Null : new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
}
return null;
/// 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)
+ public static bool ImplicitConversionExists (ResolveContext ec, Expression expr, Type target_type)
{
-#if GMCS_SOURCE
- if (expr is NullLiteral) {
- if (TypeManager.IsGenericParameter (target_type))
- return TypeParameter_to_Null (target_type);
-
- if (TypeManager.IsNullableType (target_type))
- return true;
- }
-#endif
if (ImplicitStandardConversionExists (expr, target_type))
return true;
- return ImplicitUserConversion (ec, expr, target_type, Location.Null) != null;
- }
+ if (expr.Type == InternalType.AnonymousMethod) {
+ if (!TypeManager.IsDelegateType (target_type) &&
+ TypeManager.DropGenericTypeArguments (target_type) != TypeManager.expression_type)
+ return false;
- public static bool ImplicitUserConversionExists (EmitContext ec, Type source, Type target)
- {
- return ImplicitUserConversion (ec, new EmptyExpression (source), target, Location.Null) != null;
+ AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
+ return ame.ImplicitStandardConversionExists (ec, target_type);
+ }
+
+ 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 (ec, mg, target_type);
+ }
+
+ return false;
+ }
+
+ return ImplicitUserConversion (ec, expr, target_type, Location.Null) != null;
}
/// <summary>
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;
- }
+ if (expr_type == TypeManager.null_type) {
+ NullLiteral nl = expr as NullLiteral;
+ if (nl != null)
+ return nl.ConvertImplicitly (null, target_type) != null;
}
-#endif
+
if (expr_type == TypeManager.void_type)
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;
-
- // First numeric conversions
-
- if (expr_type == TypeManager.sbyte_type){
- //
- // From sbyte to short, int, long, float, double, 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.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.uint32_type) ||
- (target_type == TypeManager.uint64_type) ||
- (target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.float_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
- //
- 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
- //
- if ((target_type == TypeManager.uint32_type) ||
- (target_type == TypeManager.uint64_type) ||
- (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.int32_type){
- //
- // From int to long, double, float, decimal
- //
- if ((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.uint32_type){
- //
- // From uint to long, ulong, double, float, decimal
- //
- if ((target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.uint64_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } else if ((expr_type == TypeManager.uint64_type) ||
- (expr_type == TypeManager.int64_type)) {
- //
- // From long/ulong to double, float, decimal
- //
- if ((target_type == TypeManager.double_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) ||
- (target_type == TypeManager.uint64_type) ||
- (target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } else if (expr_type == TypeManager.float_type){
- //
- // float to double
- //
- if (target_type == TypeManager.double_type)
- return true;
+ if (TypeManager.IsNullableType (target_type)) {
+ return ImplicitNulableConversion (null, expr, target_type) != null;
}
- 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;
- }
- }
- }
+ // First numeric conversions
+ if (ImplicitNumericConversion (null, expr_type, target_type) != null)
+ return true;
if (ImplicitReferenceConversionExists (expr, target_type))
return true;
+ bool use_class_cast;
+ if (ImplicitBoxingConversionExists (expr, target_type, out use_class_cast))
+ return true;
+
//
// Implicit Constant Expression Conversions
//
return true;
}
- if (value == 0 && expr is IntLiteral && TypeManager.IsEnumType (target_type))
+ if (value == 0 && TypeManager.IsEnumType (target_type))
return true;
}
// If `expr_type' implements `target_type' (which is an iface)
// see TryImplicitIntConversion
//
- if (target_type.IsInterface && target_type.IsAssignableFrom (expr_type))
+ if (target_type.IsInterface && TypeManager.ImplementsInterface (expr_type, target_type))
return true;
if (target_type == TypeManager.void_ptr_type && expr_type.IsPointer)
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 (target_type);
- }
+ // Conversion from __arglist to System.ArgIterator
+ if (expr_type == InternalType.Arglist)
+ return target_type == TypeManager.arg_iterator_type;
return false;
}
/// Finds "most encompassed type" according to the spec (13.4.2)
/// amongst the methods in the MethodGroupExpr
/// </summary>
- static Type FindMostEncompassedType (ArrayList types)
+ static Type FindMostEncompassedType (IList<Type> types)
{
Type best = null;
/// Finds "most encompassing type" according to the spec (13.4.2)
/// amongst the types in the given set
/// </summary>
- static Type FindMostEncompassingType (ArrayList types)
+ static Type FindMostEncompassingType (IList<Type> types)
{
Type best = null;
return null;
if (types.Count == 1)
- return (Type) types [0];
+ return types [0];
EmptyExpression expr = EmptyExpression.Grab ();
/// by making use of FindMostEncomp* methods. Applies the correct rules separately
/// for explicit and implicit conversion operators.
/// </summary>
- static public Type FindMostSpecificSource (IList list,
+ static public Type FindMostSpecificSource (IList<MethodInfo> list,
Expression source, bool apply_explicit_conv_rules)
{
- ArrayList src_types_set = new ArrayList ();
+ var src_types_set = new List<Type> ();
//
// If any operator converts from S then Sx = S
//
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;
// Explicit Conv rules
//
if (apply_explicit_conv_rules) {
- ArrayList candidate_set = new ArrayList ();
+ var candidate_set = new List<Type> ();
foreach (Type param_type in src_types_set){
if (ImplicitStandardConversionExists (source, param_type))
/// <summary>
/// Finds the most specific target Tx according to section 13.4.4
/// </summary>
- static public Type FindMostSpecificTarget (IList list,
+ static public Type FindMostSpecificTarget (IList<MethodInfo> list,
Type target, bool apply_explicit_conv_rules)
{
- ArrayList tgt_types_set = new ArrayList ();
+ var tgt_types_set = new List<Type> ();
//
// If any operator converts to T then Tx = T
// Explicit conv rules
//
if (apply_explicit_conv_rules) {
- ArrayList candidate_set = new ArrayList ();
+ var candidate_set = new List<Type> ();
EmptyExpression expr = EmptyExpression.Grab ();
/// <summary>
/// User-defined Implicit conversions
/// </summary>
- static public Expression ImplicitUserConversion (EmitContext ec, Expression source,
+ static public Expression ImplicitUserConversion (ResolveContext ec, Expression source,
Type target, Location loc)
{
- return UserDefinedConversion (ec, source, target, loc, false);
+ return UserDefinedConversion (ec, source, target, loc, false, true);
}
/// <summary>
/// User-defined Explicit conversions
/// </summary>
- static public Expression ExplicitUserConversion (EmitContext ec, Expression source,
+ static Expression ExplicitUserConversion (ResolveContext ec, Expression source,
Type target, Location loc)
{
- return UserDefinedConversion (ec, source, target, loc, true);
+ return UserDefinedConversion (ec, source, target, loc, true, true);
}
- static void AddConversionOperators (ArrayList list,
+ static void AddConversionOperators (List<MethodInfo> list,
Expression source, Type target_type,
bool look_for_explicit,
MethodGroupExpr mg)
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);
+ AParametersCollection pd = TypeManager.GetParameterData (m);
Type return_type = TypeManager.TypeToCoreType (m.ReturnType);
- Type arg_type = pd.ParameterType (0);
+ Type arg_type = pd.Types [0];
if (source_type != arg_type) {
if (!ImplicitStandardConversionExists (source, arg_type)) {
}
}
+ // See LAMESPEC: Exclude IntPtr -> int conversion
+ if (source_type == TypeManager.uintptr_type && return_type == TypeManager.uint32_type)
+ continue;
+
list.Add (m);
}
/// Compute the user-defined conversion operator from source_type to target_type.
/// `look_for_explicit' controls whether we should also include the list of explicit operators
/// </summary>
- static MethodInfo GetConversionOperator (Type container_type, Expression source, Type target_type, bool look_for_explicit)
+ static MethodInfo GetConversionOperator (CompilerContext ctx, Type container_type, Expression source, Type target_type, bool look_for_explicit)
{
- ArrayList ops = new ArrayList (4);
+ var ops = new List<MethodInfo> (4);
Type source_type = source.Type;
if (source_type != TypeManager.decimal_type) {
AddConversionOperators (ops, source, target_type, look_for_explicit,
- Expression.MethodLookup (container_type, source_type, "op_Implicit", Location.Null) as MethodGroupExpr);
+ Expression.MethodLookup (ctx, container_type, source_type, "op_Implicit", Location.Null) as MethodGroupExpr);
if (look_for_explicit) {
AddConversionOperators (ops, source, target_type, look_for_explicit,
- Expression.MethodLookup (
+ Expression.MethodLookup (ctx,
container_type, source_type, "op_Explicit", Location.Null) as MethodGroupExpr);
}
}
if (target_type != TypeManager.decimal_type) {
AddConversionOperators (ops, source, target_type, look_for_explicit,
- Expression.MethodLookup (container_type, target_type, "op_Implicit", Location.Null) as MethodGroupExpr);
+ Expression.MethodLookup (ctx, container_type, target_type, "op_Implicit", Location.Null) as MethodGroupExpr);
if (look_for_explicit) {
AddConversionOperators (ops, source, target_type, look_for_explicit,
- Expression.MethodLookup (
+ Expression.MethodLookup (ctx,
container_type, target_type, "op_Explicit", Location.Null) as MethodGroupExpr);
}
}
foreach (MethodInfo m in ops) {
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)
return method;
}
- static DoubleHash explicit_conv = new DoubleHash (100);
- static DoubleHash implicit_conv = new DoubleHash (100);
-
/// <summary>
/// User-defined conversions
/// </summary>
- static public Expression UserDefinedConversion (EmitContext ec, Expression source,
+ public static Expression UserDefinedConversion (ResolveContext ec, Expression source,
Type target, Location loc,
- bool look_for_explicit)
+ bool look_for_explicit, bool return_convert)
{
Type source_type = source.Type;
MethodInfo method = null;
+ Expression expr = null;
object o;
- DoubleHash hash = look_for_explicit ? explicit_conv : implicit_conv;
+ DoubleHash hash;
+ if (look_for_explicit) {
+ hash = explicit_conv;
+ } else {
+ // Implicit user operators cannot convert to interfaces
+ if (target.IsInterface)
+ return null;
+
+ hash = implicit_conv;
+ }
if (!(source is Constant) && hash.Lookup (source_type, target, out o)) {
method = (MethodInfo) o;
} else {
- method = GetConversionOperator (null, source, target, look_for_explicit);
- if (!(source is Constant))
- hash.Insert (source_type, target, method);
+ if (TypeManager.IsDynamicType (source_type))
+ return null;
+
+ method = GetConversionOperator (ec.Compiler, null, source, target, look_for_explicit);
}
- if (method == null)
- return null;
+ if (method != null) {
+ Type most_specific_source = TypeManager.GetParameterData (method).Types[0];
- 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
+ // if the best match was not the type that we were requested
+ // by target.
+ //
+ if (look_for_explicit) {
+ ReportPrinter temp = new SessionReportPrinter ();
+ ReportPrinter prev = ec.Report.SetPrinter (temp);
- //
- // This will do the conversion to the best match that we
- // found. Now we need to perform an implict standard conversion
- // if the best match was not the type that we were requested
- // by target.
- //
- if (look_for_explicit)
- source = ExplicitConversionStandard (ec, source, most_specific_source, loc);
- else
- source = ImplicitConversionStandard (ec, source, most_specific_source, loc);
+ expr = ExplicitConversionStandard (ec, source, most_specific_source, loc);
- if (source == null)
- return null;
+ ec.Report.SetPrinter (prev);
+ if (temp.ErrorsCount != 0)
+ expr = null;
+ } else {
+ if (ImplicitStandardConversionExists (source, most_specific_source))
+ expr = ImplicitConversionStandard (ec, source, most_specific_source, loc);
+ else
+ expr = 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);
+ if (expr == null) {
+ bool nullable = false;
+
+ if (TypeManager.IsNullableType (source_type)) {
+ source = Nullable.Unwrap.Create (source);
+ nullable = true;
+ }
+
+ Type target_underlying;
+ if (TypeManager.IsNullableType (target)) {
+ target_underlying = TypeManager.GetTypeArguments (target)[0];
+ nullable = true;
+ } else {
+ // No implicit conversion S? -> T for non-reference type T
+ if (!look_for_explicit && !TypeManager.IsReferenceType (target))
+ nullable = false;
+
+ target_underlying = target;
+ }
+
+ if (nullable) {
+ expr = UserDefinedConversion (ec, source, target_underlying, loc, look_for_explicit, return_convert);
+
+ // Do result expression lifting only when it's needed
+ if (expr != null && (!look_for_explicit || TypeManager.IsReferenceType (target)))
+ expr = new Nullable.Lifted (expr, source, target).Resolve (ec);
+
+ return expr;
+ }
+ } else {
+ expr = new UserCast (method, expr, loc).Resolve (ec);
+
+ if (return_convert && !TypeManager.IsEqual (expr.Type, target)) {
+ if (look_for_explicit) {
+ expr = ExplicitConversionStandard (ec, expr, target, loc);
+ } else {
+ expr = ImplicitConversionStandard (ec, expr, target, loc);
+ }
+ }
}
- return e;
+ if (!(source is Constant))
+ hash.Insert (source_type, target, method);
+
+ return expr;
}
/// <summary>
/// `target_type'. It returns a new expression that can be used
/// in a context that expects a `target_type'.
/// </summary>
- static public Expression ImplicitConversion (EmitContext ec, Expression expr,
+ static public Expression ImplicitConversion (ResolveContext ec, Expression expr,
Type target_type, Location loc)
{
Expression e;
/// This is different from `ImplicitConversion' in that the
/// user defined implicit conversions are excluded.
/// </summary>
- static public Expression ImplicitConversionStandard (EmitContext ec, Expression expr,
+ static public Expression ImplicitConversionStandard (ResolveContext ec, Expression expr,
Type target_type, Location loc)
{
- Type expr_type = expr.Type;
- Expression e;
-
-#if GMCS_SOURCE
- 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];
+ return ImplicitConversionStandard (ec, expr, target_type, loc, false);
+ }
- 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, target_type);
- }
- }
-#endif
+ static Expression ImplicitConversionStandard (ResolveContext ec, Expression expr, Type target_type, Location loc, bool explicit_cast)
+ {
if (expr.eclass == ExprClass.MethodGroup){
if (!TypeManager.IsDelegateType (target_type)){
return null;
}
}
- if (expr_type.Equals (target_type) && expr_type != TypeManager.null_type)
+ Type expr_type = expr.Type;
+ Expression e;
+
+ if (expr_type.Equals (target_type)) {
+ if (expr_type != TypeManager.null_type && expr_type != InternalType.AnonymousMethod)
+ return expr;
+ return null;
+ }
+
+ if (TypeManager.IsVariantOf (expr_type, target_type)) {
return expr;
+ }
+
+ if (TypeManager.IsNullableType (target_type))
+ return ImplicitNulableConversion (ec, expr, target_type);
//
// 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);
+ c = c.ConvertImplicitly (ec, target_type);
} catch {
Console.WriteLine ("Conversion error happened in line {0}", loc);
throw;
return c;
}
- e = ImplicitNumericConversion (expr, target_type);
+ e = ImplicitNumericConversion (expr, expr_type, target_type);
if (e != null)
return e;
- e = ImplicitReferenceConversion (expr, target_type);
+ e = ImplicitReferenceConversion (expr, target_type, explicit_cast);
if (e != null)
return e;
- if (TypeManager.IsEnumType (target_type) && expr is IntLiteral){
- IntLiteral i = (IntLiteral) expr;
-
- if (i.Value == 0)
- return new EnumConstant ((Constant) expr, target_type);
+ if (expr is IntConstant && TypeManager.IsEnumType (target_type)){
+ Constant i = (Constant) expr;
+ //
+ // LAMESPEC: Conversion from any 0 constant is allowed
+ //
+ // An implicit enumeration conversion permits the decimal-integer-literal 0
+ // to be converted to any enum-type and to any nullable-type whose underlying
+ // type is an enum-type
+ //
+ if (i.IsDefaultValue)
+ return new EnumConstant (i, target_type).Resolve (ec);
}
- if (ec.InUnsafe) {
+ if (ec.IsUnsafe) {
if (expr_type.IsPointer){
if (target_type == TypeManager.void_ptr_type)
return EmptyCast.Create (expr, target_type);
}
if (expr_type == TypeManager.null_type && target_type.IsPointer)
- return EmptyCast.Create (NullPointer.Null, target_type);
+ return EmptyCast.Create (new NullPointer (loc), target_type);
}
- if (expr_type == TypeManager.anonymous_method_type){
+ if (expr_type == InternalType.AnonymousMethod){
AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
Expression am = ame.Compatible (ec, target_type);
if (am != null)
- return am.DoResolve (ec);
+ return am.Resolve (ec);
}
+ if (expr_type == InternalType.Arglist && target_type == TypeManager.arg_iterator_type)
+ return expr;
+
return null;
}
/// ImplicitConversion. If there is no implicit conversion, then
/// an error is signaled
/// </summary>
- static public Expression ImplicitConversionRequired (EmitContext ec, Expression source,
+ static public Expression ImplicitConversionRequired (ResolveContext ec, Expression source,
Type target_type, Location loc)
{
Expression e = ImplicitConversion (ec, source, target_type, loc);
if (e != null)
return e;
+ if (TypeManager.IsDynamicType (source.Type)) {
+ Arguments args = new Arguments (1);
+ args.Add (new Argument (source));
+ return new DynamicConversion (target_type, 0, args, loc).Resolve (ec);
+ }
+
source.Error_ValueCannotBeConverted (ec, loc, target_type, false);
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 (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;
- }
+ Expression e = ExplicitReferenceConversion (null, source_type, target_type);
+ if (e == null)
+ return false;
- //
- // From System delegate to any delegate-type
- //
- if (source_type == TypeManager.delegate_type &&
- TypeManager.IsDelegateType (target_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;
+ bool target_is_value_type = TypeManager.IsStruct (target_type);
//
// 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
+ // From object to any reference type or value type (unboxing)
//
- if (source_type == TypeManager.object_type && !target_is_value_type)
- return new ClassCast (source, target_type);
+ if (source_type == TypeManager.object_type)
+ return source == null ? EmptyExpression.Null :
+ target_is_value_type ? (Expression) new UnboxCast (source, target_type) : new ClassCast (source, target_type);
//
- // Unboxing conversion.
+ // Unboxing conversion from the types object and System.ValueType to any non-nullable-value-type
//
- if (((source_type == TypeManager.enum_type &&
- !(source is EmptyCast)) ||
- source_type == TypeManager.value_type) && target_is_value_type)
- return new UnboxCast (source, target_type);
+ if (source_type == TypeManager.value_type && target_is_value_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);
+
+ //
+ // Unboxing conversion from any interface-type to any non-nullable-value-type that
+ // implements the interface-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);
+ if (source_type == TypeManager.delegate_type && TypeManager.IsDelegateType (target_type))
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
return null;
}
/// Performs an explicit conversion of the expression `expr' whose
/// type is expr.Type to `target_type'.
/// </summary>
- static public Expression ExplicitConversionCore (EmitContext ec, Expression expr,
+ static public Expression ExplicitConversionCore (ResolveContext ec, Expression expr,
Type target_type, Location loc)
{
Type expr_type = expr.Type;
// Explicit conversion includes implicit conversion and it used for enum underlying types too
- Expression ne = ImplicitConversionStandard (ec, expr, target_type, loc);
+ Expression ne = ImplicitConversionStandard (ec, expr, target_type, loc, true);
if (ne != null)
return ne;
- //
- // Unboxing conversions; only object types can be convertible to enum
- //
- if (expr_type == TypeManager.object_type && target_type.IsValueType)
- return new UnboxCast (expr, target_type);
-
if (TypeManager.IsEnumType (expr_type)) {
Expression underlying = EmptyCast.Create (expr, TypeManager.GetEnumUnderlyingType (expr_type));
expr = ExplicitConversionCore (ec, underlying, target_type, loc);
}
if (TypeManager.IsEnumType (target_type)){
+ //
+ // Type System.Enum can be unboxed to any enum-type
+ //
if (expr_type == TypeManager.enum_type)
return new UnboxCast (expr, target_type);
//
// LAMESPEC: IntPtr and UIntPtr conversion to any Enum is allowed
//
- if (expr_type == TypeManager.intptr_type || expr_type == TypeManager.uintptr_type) {
+ 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;
}
// 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 (ec.InUnsafe){
+ if (ec.IsUnsafe){
ne = ExplicitUnsafe (expr, target_type);
if (ne != null)
return ne;
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.byte_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
+
+ if (expr_type == TypeManager.int64_type)
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_I);
+
+ if (expr_type == TypeManager.uint64_type)
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I);
}
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)
+ if (target_type == TypeManager.byte_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- else if (target_type == TypeManager.short_type)
+ if (target_type == TypeManager.short_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- else if (target_type == TypeManager.ushort_type)
+ if (target_type == TypeManager.ushort_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- else if (target_type == TypeManager.int32_type)
+ if (target_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- else if (target_type == TypeManager.uint32_type)
+ if (target_type == TypeManager.uint32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- else if (target_type == TypeManager.uint64_type)
+ if (target_type == TypeManager.int64_type)
+ return new ConvCast (expr, target_type, ConvCast.Mode.I_I8);
+ 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);
- }
}
return null;
}
/// <summary>
/// Same as ExplicitConversion, only it doesn't include user defined conversions
/// </summary>
- static public Expression ExplicitConversionStandard (EmitContext ec, Expression expr,
+ static public Expression ExplicitConversionStandard (ResolveContext ec, Expression expr,
Type target_type, Location l)
{
- int errors = Report.Errors;
+ int errors = ec.Report.Errors;
Expression ne = ImplicitConversionStandard (ec, expr, target_type, l);
- if (Report.Errors > errors)
+ if (ec.Report.Errors > errors)
return null;
if (ne != 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)
+ if (ec.IsUnsafe && expr.Type == TypeManager.void_ptr_type && target_type.IsPointer)
return EmptyCast.Create (expr, target_type);
expr.Error_ValueCannotBeConverted (ec, l, target_type, true);
/// 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,
+ static public Expression ExplicitConversion (ResolveContext ec, Expression expr,
Type target_type, Location loc)
{
- Expression e;
-#if GMCS_SOURCE
+ Expression e = ExplicitConversionCore (ec, expr, target_type, loc);
+ if (e != null) {
+ //
+ // Don't eliminate explicit precission casts
+ //
+ if (e == expr) {
+ if (target_type == TypeManager.float_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+
+ if (target_type == TypeManager.double_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ }
+
+ return e;
+ }
+
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;
+ Type target = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (target_type)[0]);
+ Expression unwrap = Nullable.Unwrap.Create (expr);
+ e = ExplicitConversion (ec, unwrap, target, expr.Location);
+ if (e == null)
+ return null;
+
+ return new Nullable.Lifted (e, unwrap, target_type).Resolve (ec);
} else if (expr_type == TypeManager.object_type) {
return new UnboxCast (expr, target_type);
} else {
- Type target = TypeManager.GetTypeArguments (target_type) [0];
+ Type target = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (target_type) [0]);
e = ExplicitConversionCore (ec, expr, target, loc);
if (e != null)
return Nullable.Wrap.Create (e, target_type);
}
} else if (TypeManager.IsNullableType (expr_type)) {
- e = Nullable.Unwrap.Create (expr, ec);
+ e = Nullable.Unwrap.Create (expr, false);
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);
+ e = ExplicitConversionCore (ec, e, target_type, loc);
if (e != null)
- e = EmptyCast.Create (e, target_type);
- return e;
+ return EmptyCast.Create (e, target_type);
}
-#endif
- e = ExplicitConversionCore (ec, expr, target_type, loc);
- if (e != null)
- return e;
e = ExplicitUserConversion (ec, expr, target_type, loc);
if (e != null)
projects / mono.git / blobdiff