// 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
static class Convert {
static EmptyExpression MyEmptyExpr;
- static DoubleHash explicit_conv;
- static DoubleHash implicit_conv;
static Convert ()
{
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 ();
- list.Add (gc.EffectiveBaseClass);
- foreach (Type t in gc.InterfaceConstraints) {
- if (!TypeManager.IsGenericParameter (t))
- continue;
-
- GenericConstraints new_gc = TypeManager.GetTypeParameterConstraints (t);
- if (new_gc != null)
- list.Add (TypeParam_EffectiveBaseType (new_gc));
- }
- return FindMostEncompassedType (list);
- }
-
//
// 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, bool isExplicit)
+ static bool ArrayToIList (ArrayContainer array, TypeSpec list, bool isExplicit)
{
- if ((array.GetArrayRank () != 1) || !TypeManager.IsGenericType (list))
+ if (array.Rank != 1 || !list.IsGeneric)
return false;
- Type gt = TypeManager.DropGenericTypeArguments (list);
- if ((gt != TypeManager.generic_ilist_type) &&
- (gt != TypeManager.generic_icollection_type) &&
- (gt != TypeManager.generic_ienumerable_type))
+ var open_version = list.GetDefinition ();
+ if ((open_version != TypeManager.generic_ilist_type) &&
+ (open_version != TypeManager.generic_icollection_type) &&
+ (open_version != TypeManager.generic_ienumerable_type))
return false;
- Type element_type = TypeManager.GetElementType (array);
- Type arg_type = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (list) [0]);
-
- if (element_type == arg_type)
+ var arg_type = list.TypeArguments[0];
+ if (array.Element == arg_type)
return true;
if (isExplicit)
- return ExplicitReferenceConversionExists (element_type, arg_type);
+ return ExplicitReferenceConversionExists (array.Element, arg_type);
- Type t = TypeManager.GetElementType (array);
if (MyEmptyExpr == null)
- MyEmptyExpr = new EmptyExpression (t);
+ MyEmptyExpr = new EmptyExpression (array.Element);
else
- MyEmptyExpr.SetType (t);
+ MyEmptyExpr.SetType (array.Element);
return ImplicitReferenceConversionExists (MyEmptyExpr, arg_type);
}
- static bool IList_To_Array(Type list, Type array)
+ static bool IList_To_Array(TypeSpec list, ArrayContainer array)
{
- if (!TypeManager.IsGenericType (list) || !array.IsArray || array.GetArrayRank() != 1)
+ if (array.Rank != 1 || !list.IsGeneric)
return false;
-
- Type gt = TypeManager.DropGenericTypeArguments (list);
- if (gt != TypeManager.generic_ilist_type &&
- gt != TypeManager.generic_icollection_type &&
- gt != TypeManager.generic_ienumerable_type)
+
+ var open_version = list.GetDefinition ();
+ if ((open_version != TypeManager.generic_ilist_type) &&
+ (open_version != TypeManager.generic_icollection_type) &&
+ (open_version != TypeManager.generic_ienumerable_type))
return false;
-
- Type arg_type = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments(list)[0]);
- Type element_type = TypeManager.GetElementType(array);
-
- if (element_type == arg_type)
+
+ var arg_type = list.TypeArguments[0];
+ if (array.Element == arg_type)
return true;
if (MyEmptyExpr == null)
- MyEmptyExpr = new EmptyExpression(element_type);
+ MyEmptyExpr = new EmptyExpression (array.Element);
else
- MyEmptyExpr.SetType(element_type);
-
- return ImplicitReferenceConversionExists(MyEmptyExpr, arg_type) || ExplicitReferenceConversionExists(element_type, arg_type);
+ MyEmptyExpr.SetType (array.Element);
+
+ return ImplicitReferenceConversionExists (MyEmptyExpr, arg_type) || ExplicitReferenceConversionExists (array.Element, arg_type);
}
- static Expression ImplicitTypeParameterConversion (Expression expr,
- Type target_type)
+ static Expression ImplicitTypeParameterConversion (Expression expr, TypeSpec target_type)
{
- Type expr_type = expr.Type;
+ var expr_type = (TypeParameterSpec) expr.Type;
+
+ //
+ // From T to a type parameter U, provided T depends on U
+ //
+ var ttype = target_type as TypeParameterSpec;
+ if (ttype != null) {
+ if (expr_type.TypeArguments != null) {
+ foreach (var targ in expr_type.TypeArguments) {
+ if (!TypeSpecComparer.Override.IsEqual (ttype, targ))
+ continue;
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (expr_type);
+ if (expr_type.IsReferenceType && !ttype.IsReferenceType)
+ return new BoxedCast (expr, target_type);
- if (gc == null) {
- if (target_type == TypeManager.object_type)
- return new BoxedCast (expr, target_type);
+ return new ClassCast (expr, target_type);
+ }
+ }
return null;
}
- // We're converting from a type parameter which is known to be a reference type.
- Type base_type = TypeParam_EffectiveBaseType (gc);
-
- if (TypeManager.IsSubclassOf (base_type, target_type))
- return new ClassCast (expr, target_type);
-
- if (target_type.IsInterface) {
- if (TypeManager.ImplementsInterface (base_type, target_type))
+ //
+ // LAMESPEC: From T to dynamic type because it's like T to object
+ //
+ if (target_type == InternalType.Dynamic) {
+ if (expr_type.IsReferenceType)
return new ClassCast (expr, target_type);
- foreach (Type t in gc.InterfaceConstraints) {
- if (TypeManager.IsSubclassOf (t, target_type))
- return new ClassCast (expr, target_type);
- if (TypeManager.ImplementsInterface (t, target_type))
- return new ClassCast (expr, target_type);
- }
+ return new BoxedCast (expr, target_type);
}
- foreach (Type t in gc.InterfaceConstraints) {
- if (!TypeManager.IsGenericParameter (t))
- continue;
- if (TypeManager.IsSubclassOf (t, target_type))
- return new ClassCast (expr, target_type);
- if (TypeManager.ImplementsInterface (t, target_type))
+ //
+ // From T to its effective base class C
+ // From T to any base class of C (it cannot contain dynamic of be of dynamic type)
+ // From T to any interface implemented by C
+ //
+ var base_type = expr_type.GetEffectiveBase ();
+ if (base_type == target_type || TypeSpec.IsBaseClass (base_type, target_type, false) || base_type.ImplementsInterface (target_type)) {
+ if (expr_type.IsReferenceType)
return new ClassCast (expr, target_type);
- }
-
- return null;
- }
-
- static bool ImplicitTypeParameterBoxingConversion (Type expr_type, Type target_type,
- out bool use_class_cast)
- {
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (expr_type);
- if (gc == null) {
- use_class_cast = false;
- return target_type == TypeManager.object_type;
+ return new BoxedCast (expr, target_type);
}
- use_class_cast = true;
-
- if (!gc.HasReferenceTypeConstraint)
- return false;
-
- // We're converting from a type parameter which is known to be a reference type.
- Type base_type = TypeParam_EffectiveBaseType (gc);
-
- if (TypeManager.IsSubclassOf (base_type, target_type))
- return true;
-
- if (target_type.IsInterface) {
- if (TypeManager.ImplementsInterface (base_type, target_type))
- return true;
-
- foreach (Type t in gc.InterfaceConstraints) {
- if (TypeManager.IsSubclassOf (t, target_type))
- return true;
- if (TypeManager.ImplementsInterface (t, target_type))
- return true;
- }
- }
+ if (target_type.IsInterface && expr_type.IsConvertibleToInterface (target_type)) {
+ if (expr_type.IsReferenceType)
+ return new ClassCast (expr, target_type);
- 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;
+ return new BoxedCast (expr, target_type);
}
- use_class_cast = false;
- return false;
+ return null;
}
- static Expression ExplicitTypeParameterConversion (Expression source, Type source_type, Type target_type)
+ static Expression ExplicitTypeParameterConversion (Expression source, TypeSpec source_type, TypeSpec target_type)
{
- if (TypeManager.IsGenericParameter (target_type)) {
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (target_type);
- if (gc == null)
- return null;
+ var target_tp = target_type as TypeParameterSpec;
+ if (target_tp != null) {
+ if (target_tp.TypeArguments != null) {
+ foreach (var targ in target_tp.TypeArguments) {
+ if (!TypeSpecComparer.Override.IsEqual (source_type, targ))
+ continue;
- foreach (Type iface in gc.InterfaceConstraints) {
- if (!TypeManager.IsGenericParameter (iface))
- continue;
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
+ }
+ }
+/*
+ if (target_tp.Interfaces != null) {
+ foreach (TypeSpec iface in target_tp.Interfaces) {
+ if (!TypeManager.IsGenericParameter (iface))
+ continue;
- if (TypeManager.IsSubclassOf (source_type, iface))
- return source == null ? EmptyExpression.Null : new ClassCast (source, target_type, true);
+ if (TypeManager.IsSubclassOf (source_type, iface))
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type, true);
+ }
}
+*/
+ return null;
}
if (target_type.IsInterface)
return null;
}
- static Expression ImplicitReferenceConversion (Expression expr, Type target_type, bool explicit_cast)
+ static Expression ImplicitReferenceConversion (Expression expr, TypeSpec target_type, bool explicit_cast)
{
- Type expr_type = expr.Type;
+ TypeSpec expr_type = expr.Type;
if (expr_type == null && expr.eclass == ExprClass.MethodGroup){
// if we are a method group, emit a warning
if (expr_type == TypeManager.void_type)
return null;
- if (TypeManager.IsGenericParameter (expr_type))
+ if (expr_type.Kind == MemberKind.TypeParameter)
return ImplicitTypeParameterConversion (expr, target_type);
//
//
NullLiteral nl = expr as NullLiteral;
if (nl != null) {
- return nl.ConvertImplicitly(target_type);
+ return nl.ConvertImplicitly (null, target_type);
}
if (ImplicitReferenceConversionExists (expr, target_type)) {
return EmptyCast.Create (expr, target_type);
}
- bool use_class_cast;
- if (ImplicitBoxingConversionExists (expr, target_type, out use_class_cast)) {
- if (use_class_cast)
- return new ClassCast (expr, target_type);
- else
- return new BoxedCast (expr, target_type);
- }
-
- return null;
+ return ImplicitBoxingConversion (expr, expr_type, target_type);
}
//
// 6.1.6 Implicit reference conversions
//
- public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
+ public static bool ImplicitReferenceConversionExists (Expression expr, TypeSpec target_type)
{
if (TypeManager.IsStruct (target_type))
return false;
- Type expr_type = expr.Type;
+ TypeSpec expr_type = expr.Type;
// from the null type to any reference-type.
- if (expr_type == TypeManager.null_type)
+ if (expr_type == InternalType.Null)
return target_type != InternalType.AnonymousMethod;
if (TypeManager.IsGenericParameter (expr_type))
return ImplicitTypeParameterConversion (expr, target_type) != null;
+ // This code is kind of mirrored inside ImplicitStandardConversionExists
+ // with the small distinction that we only probe there
//
- // 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 || TypeManager.IsDynamicType (target_type)) {
- //
- // A pointer type cannot be converted to object
- //
- if (expr_type.IsPointer)
- return false;
+ // Always ensure that the code here and there is in sync
- if (TypeManager.IsValueType (expr_type))
- return false;
+ // from any class-type S to any interface-type T.
+ if (target_type.IsInterface) {
+ if (expr_type.ImplementsInterface (target_type)){
+ return !TypeManager.IsValueType (expr_type);
+ }
+ }
- if (expr_type.IsClass || expr_type.IsInterface || expr_type == TypeManager.enum_type){
- // No mcs internal types are convertible
- return expr_type.Module != typeof (Convert).Module;
+ //
+ // Implicit reference conversions (no-boxing) to object or dynamic
+ //
+ if (target_type == TypeManager.object_type || target_type == InternalType.Dynamic) {
+ switch (expr_type.Kind) {
+ case MemberKind.Class:
+ case MemberKind.Interface:
+ case MemberKind.Delegate:
+ case MemberKind.ArrayType:
+ return true;
}
- return false;
- } else if (target_type == TypeManager.value_type) {
+ return expr_type == InternalType.Dynamic;
+ }
+
+ if (target_type == TypeManager.value_type) {
return expr_type == TypeManager.enum_type;
- } else if (TypeManager.IsSubclassOf (expr_type, target_type)) {
+ } else if (expr_type == target_type || TypeSpec.IsBaseClass (expr_type, target_type, true)) {
//
// Special case: enumeration to System.Enum.
// System.Enum is not a value type, it is a class, so we need
//
if (target_type == TypeManager.enum_type || TypeManager.IsGenericParameter (expr_type))
return false;
-
- 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 (TypeManager.IsValueType (expr_type))
+ return false;
- // 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);
- }
+ // Array type variance conversion
+ //if (target_type.IsArray != expr_type.IsArray)
+ // return false;
+
+ return true;
}
- if (expr_type.IsArray) {
+ var expr_type_array = expr_type as ArrayContainer;
+ if (expr_type_array != null) {
+ var target_type_array = target_type as ArrayContainer;
// from an array-type S to an array-type of type T
- if (target_type.IsArray && expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
+ if (target_type_array != null && expr_type_array.Rank == target_type_array.Rank) {
//
// Both SE and TE are reference-types
//
- Type expr_element_type = TypeManager.GetElementType (expr_type);
+ TypeSpec expr_element_type = expr_type_array.Element;
if (!TypeManager.IsReferenceType (expr_element_type))
return false;
- Type target_element_type = TypeManager.GetElementType (target_type);
+ TypeSpec target_element_type = target_type_array.Element;
if (!TypeManager.IsReferenceType (target_element_type))
return false;
return true;
// from an array-type of type T to IList<T>
- if (Array_To_IList (expr_type, target_type, false))
+ if (ArrayToIList (expr_type_array, target_type, false))
return true;
return false;
}
- if (TypeManager.IsVariantOf (expr_type, target_type))
+ if (TypeSpecComparer.Variant.IsEqual (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);
+ return expr_type.ImplementsInterface (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;
-
- if (TypeManager.IsEqual (expr_type, target_type))
+ (expr_type == TypeManager.delegate_type || expr_type.IsDelegate))
return true;
return false;
}
- public static bool ImplicitBoxingConversionExists (Expression expr, Type target_type,
- out bool use_class_cast)
+ public static Expression ImplicitBoxingConversion (Expression expr, TypeSpec expr_type, TypeSpec target_type)
{
- Type expr_type = expr.Type;
- use_class_cast = false;
-
//
// From any value-type to the type object.
//
- if (target_type == TypeManager.object_type || TypeManager.IsDynamicType (target_type)) {
+ if (target_type == TypeManager.object_type || target_type == InternalType.Dynamic) {
//
// A pointer type cannot be converted to object
//
if (expr_type.IsPointer)
- return false;
+ return null;
+
+ if (!TypeManager.IsValueType (expr_type))
+ return null;
- return TypeManager.IsValueType (expr_type);
+ return expr == null ? EmptyExpression.Null : new BoxedCast (expr, target_type);
}
//
// From any value-type to the type System.ValueType.
//
- if (target_type == TypeManager.value_type)
- return TypeManager.IsValueType (expr_type);
+ if (target_type == TypeManager.value_type) {
+ if (!TypeManager.IsValueType (expr_type))
+ return null;
+
+ return expr == null ? EmptyExpression.Null : new BoxedCast (expr, target_type);
+ }
if (target_type == TypeManager.enum_type) {
//
// From any enum-type to the type System.Enum.
//
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.IsEnumType (TypeManager.GetTypeArguments (expr_type) [0]);
+ return expr == null ? EmptyExpression.Null : new BoxedCast (expr, target_type);
}
- if (TypeManager.IsSubclassOf (expr_type, target_type)) {
+ //
+ // From a nullable-type to a reference type, if a boxing conversion exists from
+ // the underlying type to the reference type
+ //
+ if (TypeManager.IsNullableType (expr_type)) {
+ if (!TypeManager.IsReferenceType (target_type))
+ return null;
+
+ var res = ImplicitBoxingConversion (expr, Nullable.NullableInfo.GetUnderlyingType (expr_type), target_type);
+
+ // "cast" underlying type to target type to emit correct InvalidCastException when
+ // underlying hierarchy changes without recompilation
+ if (res != null && expr != null)
+ res = new UnboxCast (res, target_type);
+
+ return res;
+ }
+
+ if (TypeSpec.IsBaseClass (expr_type, target_type, false)) {
//
// Don't box same type arguments
//
if (TypeManager.IsGenericParameter (expr_type) && expr_type != target_type)
- return true;
+ return expr == null ? EmptyExpression.Null : new BoxedCast (expr, target_type);
- return false;
+ return null;
}
// This code is kind of mirrored inside ImplicitStandardConversionExists
// 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);
+ if (expr_type.ImplementsInterface (target_type) &&
+ (TypeManager.IsGenericParameter (expr_type) || TypeManager.IsValueType (expr_type))) {
+ return expr == null ? EmptyExpression.Null : new BoxedCast (expr, target_type);
+ }
}
- if (TypeManager.IsGenericParameter (expr_type))
- return ImplicitTypeParameterBoxingConversion (
- expr_type, target_type, out use_class_cast);
-
- return false;
+ return null;
}
- public static Expression ImplicitNulableConversion (ResolveContext ec, Expression expr, Type target_type)
+ public static Expression ImplicitNulableConversion (ResolveContext ec, Expression expr, TypeSpec target_type)
{
- Type expr_type = expr.Type;
+ TypeSpec expr_type = expr.Type;
//
// From null to any nullable type
//
- if (expr_type == TypeManager.null_type)
+ if (expr_type == InternalType.Null)
return ec == null ? EmptyExpression.Null : Nullable.LiftedNull.Create (target_type, expr.Location);
- Type target = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (target_type)[0]);
- Expression e;
+ // S -> T?
+ TypeSpec t_el = Nullable.NullableInfo.GetUnderlyingType (target_type);
// S? -> T?
- if (TypeManager.IsNullableType (expr_type)) {
- Type etype = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (expr_type)[0]);
+ if (TypeManager.IsNullableType (expr_type))
+ expr_type = Nullable.NullableInfo.GetUnderlyingType (expr_type);
- if (ec == null)
- return ImplicitConversionExists (ec, new EmptyExpression (etype), target) ? EmptyExpression.Null : null;
+ //
+ // Predefined implicit identity or implicit numeric conversion
+ // has to exist between underlying type S and underlying type T
+ //
- Expression unwrap = Nullable.Unwrap.Create (expr);
- e = ImplicitConversion (ec, unwrap, target, expr.Location);
- if (e == null)
- return null;
+ // conversion exists only mode
+ if (ec == null) {
+ if (expr_type == t_el)
+ return EmptyExpression.Null;
- return new Nullable.Lifted (e, unwrap, target_type).Resolve (ec);
+ if (expr is Constant)
+ return ((Constant) expr).ConvertImplicitly (ec, t_el);
+
+ return ImplicitNumericConversion (null, expr_type, t_el);
}
- // S -> T?
- if (ec == null)
- return ImplicitConversionExists (ec, expr, target) ? EmptyExpression.Null : null;
+ Expression unwrap;
+ if (expr_type != expr.Type)
+ unwrap = Nullable.Unwrap.Create (expr);
+ else
+ unwrap = expr;
- e = ImplicitConversion (ec, expr, target, expr.Location);
- if (e != null)
- return Nullable.Wrap.Create (e, target_type);
+ Expression conv = unwrap;
+ if (expr_type != t_el) {
+ if (conv is Constant)
+ conv = ((Constant)conv).ConvertImplicitly (ec, t_el);
+ else
+ conv = ImplicitNumericConversion (conv, expr_type, t_el);
- return null;
+ if (conv == null)
+ return null;
+ }
+
+ if (expr_type != expr.Type)
+ return new Nullable.Lifted (conv, unwrap, target_type).Resolve (ec);
+
+ 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>
- public static Expression ImplicitNumericConversion (Expression expr, Type target_type)
+ public static Expression ImplicitNumericConversion (Expression expr, TypeSpec target_type)
{
return ImplicitNumericConversion (expr, expr.Type, target_type);
}
- static Expression ImplicitNumericConversion (Expression expr, Type expr_type, Type target_type)
+ static Expression ImplicitNumericConversion (Expression expr, TypeSpec expr_type, TypeSpec target_type)
{
if (expr_type == TypeManager.sbyte_type){
//
/// Same as ImplicitStandardConversionExists except that it also looks at
/// implicit user defined conversions - needed for overload resolution
/// </summary>
- public static bool ImplicitConversionExists (ResolveContext ec, Expression expr, Type target_type)
+ public static bool ImplicitConversionExists (ResolveContext ec, Expression expr, TypeSpec target_type)
{
if (ImplicitStandardConversionExists (expr, target_type))
return true;
if (expr.Type == InternalType.AnonymousMethod) {
- if (!TypeManager.IsDelegateType (target_type) &&
- TypeManager.DropGenericTypeArguments (target_type) != TypeManager.expression_type)
+ if (!TypeManager.IsDelegateType (target_type) && target_type.GetDefinition () != TypeManager.expression_type)
return false;
AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
}
if (expr.eclass == ExprClass.MethodGroup) {
- if (TypeManager.IsDelegateType (target_type) && RootContext.Version != LanguageVersion.ISO_1) {
+ if (target_type.IsDelegate && RootContext.Version != LanguageVersion.ISO_1) {
MethodGroupExpr mg = expr as MethodGroupExpr;
if (mg != null)
return DelegateCreation.ImplicitStandardConversionExists (ec, mg, target_type);
return ImplicitUserConversion (ec, expr, target_type, Location.Null) != null;
}
- public static bool ImplicitUserConversionExists (ResolveContext ec, Type source, Type target)
- {
- return ImplicitUserConversion (ec, new EmptyExpression (source), target, Location.Null) != null;
- }
-
/// <summary>
/// Determines if a standard implicit conversion exists from
/// expr_type to target_type
///
- /// ec should point to a real EmitContext if expr.Type is TypeManager.anonymous_method_type.
/// </summary>
- public static bool ImplicitStandardConversionExists (Expression expr, Type target_type)
+ public static bool ImplicitStandardConversionExists (Expression expr, TypeSpec target_type)
{
- Type expr_type = expr.Type;
+ TypeSpec expr_type = expr.Type;
- if (expr_type == TypeManager.null_type) {
- NullLiteral nl = expr as NullLiteral;
- if (nl != null)
- return nl.ConvertImplicitly (target_type) != null;
- }
+ NullLiteral nl = expr as NullLiteral;
+ if (nl != null)
+ return nl.ConvertImplicitly (null, target_type) != null;
if (expr_type == TypeManager.void_type)
return false;
- if (TypeManager.IsEqual (expr_type, target_type))
+ if (expr_type == target_type)
return true;
- if (TypeManager.IsNullableType (target_type))
+ // Implicit dynamic conversion
+ if (expr_type == InternalType.Dynamic) {
+ switch (target_type.Kind) {
+ case MemberKind.ArrayType:
+ case MemberKind.Class:
+ case MemberKind.Struct:
+ case MemberKind.Delegate:
+ case MemberKind.Enum:
+ case MemberKind.Interface:
+ case MemberKind.TypeParameter:
+ return true;
+ }
+
+ return false;
+ }
+
+ if (TypeManager.IsNullableType (target_type)) {
return ImplicitNulableConversion (null, expr, target_type) != null;
+ }
// First numeric conversions
if (ImplicitNumericConversion (null, expr_type, target_type) != null)
if (ImplicitReferenceConversionExists (expr, target_type))
return true;
- bool use_class_cast;
- if (ImplicitBoxingConversionExists (expr, target_type, out use_class_cast))
+ if (ImplicitBoxingConversion (null, expr_type, target_type) != null)
return true;
-
+
//
// Implicit Constant Expression Conversions
//
if (value >= 0)
return true;
}
-
- if (value == 0 && expr is IntLiteral && TypeManager.IsEnumType (target_type))
- return true;
}
if (expr is LongConstant && target_type == TypeManager.uint64_type){
return true;
}
+ if (expr is IntegralConstant && TypeManager.IsEnumType (target_type)) {
+ var i = (IntegralConstant) expr;
+ //
+ // LAMESPEC: csc allows any constant like 0 values to be converted, including const float f = 0.0
+ //
+ // 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
+ //
+ return i.IsZeroInteger;
+ }
+
//
// If `expr_type' implements `target_type' (which is an iface)
// see TryImplicitIntConversion
//
- if (target_type.IsInterface && TypeManager.ImplementsInterface (expr_type, target_type))
+ if (target_type.IsInterface && expr_type.ImplementsInterface (target_type))
return true;
if (target_type == TypeManager.void_ptr_type && expr_type.IsPointer)
/// Finds "most encompassed type" according to the spec (13.4.2)
/// amongst the methods in the MethodGroupExpr
/// </summary>
- static Type FindMostEncompassedType (ArrayList types)
+ public static TypeSpec FindMostEncompassedType (IEnumerable<TypeSpec> types)
{
- Type best = null;
-
- if (types.Count == 0)
- return null;
-
- if (types.Count == 1)
- return (Type) types [0];
-
+ TypeSpec best = null;
EmptyExpression expr = EmptyExpression.Grab ();
- foreach (Type t in types) {
+ foreach (TypeSpec t in types) {
if (best == null) {
best = t;
continue;
}
expr.SetType (best);
- foreach (Type t in types) {
+ foreach (TypeSpec t in types) {
if (best == t)
continue;
if (!ImplicitStandardConversionExists (expr, t)) {
/// 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 TypeSpec FindMostEncompassingType (IList<TypeSpec> types)
{
- Type best = null;
+ TypeSpec best = null;
if (types.Count == 0)
return null;
if (types.Count == 1)
- return (Type) types [0];
+ return types [0];
EmptyExpression expr = EmptyExpression.Grab ();
- foreach (Type t in types) {
+ foreach (TypeSpec t in types) {
if (best == null) {
best = t;
continue;
best = t;
}
- foreach (Type t in types) {
+ foreach (TypeSpec t in types) {
if (best == t)
continue;
expr.SetType (t);
/// 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 TypeSpec FindMostSpecificSource (IList<MethodSpec> list,
Expression source, bool apply_explicit_conv_rules)
{
- ArrayList src_types_set = new ArrayList ();
+ var src_types_set = new List<TypeSpec> ();
//
// If any operator converts from S then Sx = S
//
- Type source_type = source.Type;
- foreach (MethodBase mb in list){
- AParametersCollection pd = TypeManager.GetParameterData (mb);
- Type param_type = pd.Types [0];
+ TypeSpec source_type = source.Type;
+ foreach (var mb in list){
+ TypeSpec param_type = mb.Parameters.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<TypeSpec> ();
- foreach (Type param_type in src_types_set){
+ foreach (TypeSpec param_type in src_types_set){
if (ImplicitStandardConversionExists (source, param_type))
candidate_set.Add (param_type);
}
/// <summary>
/// Finds the most specific target Tx according to section 13.4.4
/// </summary>
- static public Type FindMostSpecificTarget (IList list,
- Type target, bool apply_explicit_conv_rules)
+ static public TypeSpec FindMostSpecificTarget (IList<MethodSpec> list,
+ TypeSpec target, bool apply_explicit_conv_rules)
{
- ArrayList tgt_types_set = new ArrayList ();
+ var tgt_types_set = new List<TypeSpec> ();
//
// If any operator converts to T then Tx = T
//
- foreach (MethodInfo mi in list){
- Type ret_type = TypeManager.TypeToCoreType (mi.ReturnType);
+ foreach (var mi in list){
+ TypeSpec ret_type = mi.ReturnType;
if (ret_type == target)
return ret_type;
// Explicit conv rules
//
if (apply_explicit_conv_rules) {
- ArrayList candidate_set = new ArrayList ();
+ var candidate_set = new List<TypeSpec> ();
EmptyExpression expr = EmptyExpression.Grab ();
- foreach (Type ret_type in tgt_types_set){
+ foreach (TypeSpec ret_type in tgt_types_set){
expr.SetType (ret_type);
if (ImplicitStandardConversionExists (expr, target))
/// <summary>
/// User-defined Implicit conversions
/// </summary>
- static public Expression ImplicitUserConversion (ResolveContext ec, Expression source,
- Type target, Location loc)
+ static public Expression ImplicitUserConversion (ResolveContext ec, Expression source, TypeSpec target, Location loc)
{
- Expression expr = UserDefinedConversion (ec, source, target, loc, false);
- if (expr != null && !TypeManager.IsEqual (expr.Type, target))
- expr = ImplicitConversionStandard (ec, expr, target, loc);
-
- return expr;
+ return UserDefinedConversion (ec, source, target, true, loc);
}
/// <summary>
/// User-defined Explicit conversions
/// </summary>
- static public Expression ExplicitUserConversion (ResolveContext ec, Expression source,
- Type target, Location loc)
+ static Expression ExplicitUserConversion (ResolveContext ec, Expression source, TypeSpec target, Location loc)
{
- Expression expr = UserDefinedConversion (ec, source, target, loc, true);
- if (expr != null && !TypeManager.IsEqual (expr.Type, target))
- expr = ExplicitConversionStandard (ec, expr, target, loc);
-
- return expr;
+ return UserDefinedConversion (ec, source, target, false, loc);
}
- static void AddConversionOperators (ArrayList list,
- Expression source, Type target_type,
- bool look_for_explicit,
- MethodGroupExpr mg)
+ static void FindApplicableUserDefinedConversionOperators (IList<MemberSpec> operators, Expression source, TypeSpec target, bool implicitOnly, ref List<MethodSpec> candidates)
{
- if (mg == null)
- return;
-
- 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;
+ if (source.Type == TypeManager.intptr_type) {
+ if (target == TypeManager.uint32_type)
+ target = TypeManager.int32_type;
+ } else if (source.Type == TypeManager.uintptr_type) {
+ if (target == TypeManager.int64_type)
+ target = TypeManager.uint64_type;
}
- foreach (MethodInfo m in mg.Methods) {
- AParametersCollection pd = TypeManager.GetParameterData (m);
- Type return_type = TypeManager.TypeToCoreType (m.ReturnType);
- Type arg_type = pd.Types [0];
+ // For a conversion operator to be applicable, it must be possible
+ // to perform a standard conversion from the source type to
+ // the operand type of the operator, and it must be possible
+ // to perform a standard conversion from the result type of
+ // the operator to the target type.
- if (source_type != arg_type) {
- if (!ImplicitStandardConversionExists (source, arg_type)) {
- if (!look_for_explicit)
- continue;
- expr.SetType (arg_type);
- if (!ImplicitStandardConversionExists (expr, source_type))
- continue;
- }
- }
+ Expression texpr = null;
- if (target_type != return_type) {
- expr.SetType (return_type);
- if (!ImplicitStandardConversionExists (expr, target_type)) {
- if (!look_for_explicit)
- continue;
- expr.SetType (target_type);
- if (!ImplicitStandardConversionExists (expr, return_type))
- continue;
- }
+ foreach (MethodSpec op in operators) {
+
+ // Can be null because MemberCache.GetUserOperator does not resize the array
+ if (op == null)
+ continue;
+
+ var t = op.Parameters.Types[0];
+ if (source.Type != t && !ImplicitStandardConversionExists (source, t)) {
+ if (implicitOnly)
+ continue;
+
+ if (!ImplicitStandardConversionExists (new EmptyExpression (t), source.Type))
+ continue;
}
- // See LAMESPEC: Exclude IntPtr -> int conversion
- if (source_type == TypeManager.uintptr_type && return_type == TypeManager.uint32_type)
+ t = op.ReturnType;
+
+ // LAMESPEC: Exclude UIntPtr -> int conversion
+ if (t == TypeManager.uint32_type && source.Type == TypeManager.uintptr_type)
continue;
- list.Add (m);
- }
+ if (target != t && !ImplicitStandardConversionExists (new EmptyExpression (t), target)) {
+ if (implicitOnly)
+ continue;
- EmptyExpression.Release (expr);
+ if (texpr == null)
+ texpr = new EmptyExpression (target);
+
+ if (!ImplicitStandardConversionExists (texpr, t))
+ continue;
+ }
+
+ if (candidates == null)
+ candidates = new List<MethodSpec> ();
+
+ candidates.Add (op);
+ }
}
- /// <summary>
- /// 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)
+ //
+ // User-defined conversions
+ //
+ static Expression UserDefinedConversion (ResolveContext ec, Expression source, TypeSpec target, bool implicitOnly, Location loc)
{
- ArrayList ops = new ArrayList (4);
+ List<MethodSpec> candidates = null;
- Type source_type = source.Type;
+ //
+ // If S or T are nullable types, S0 and T0 are their underlying types
+ // otherwise S0 and T0 are equal to S and T respectively.
+ //
+ TypeSpec source_type = source.Type;
+ TypeSpec target_type = target;
+ Expression unwrap;
- 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);
- if (look_for_explicit) {
- AddConversionOperators (ops, source, target_type, look_for_explicit,
- Expression.MethodLookup (
- container_type, source_type, "op_Explicit", Location.Null) as MethodGroupExpr);
- }
- }
+ if (TypeManager.IsNullableType (source_type)) {
+ // No implicit conversion S? -> T for non-reference types
+ if (implicitOnly && !TypeManager.IsReferenceType (target_type) && !TypeManager.IsNullableType (target_type))
+ return null;
- 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);
- if (look_for_explicit) {
- AddConversionOperators (ops, source, target_type, look_for_explicit,
- Expression.MethodLookup (
- container_type, target_type, "op_Explicit", Location.Null) as MethodGroupExpr);
- }
+ unwrap = source = Nullable.Unwrap.Create (source);
+ source_type = source.Type;
+ } else {
+ unwrap = null;
}
- if (ops.Count == 0)
- return null;
+ if (TypeManager.IsNullableType (target_type))
+ target_type = Nullable.NullableInfo.GetUnderlyingType (target_type);
- Type most_specific_source = FindMostSpecificSource (ops, source, look_for_explicit);
- if (most_specific_source == null)
- return null;
+ // Only these containers can contain a user defined implicit or explicit operators
+ const MemberKind user_conversion_kinds = MemberKind.Class | MemberKind.Struct | MemberKind.TypeParameter;
- Type most_specific_target = FindMostSpecificTarget (ops, target_type, look_for_explicit);
- if (most_specific_target == null)
- return null;
+ if ((source_type.Kind & user_conversion_kinds) != 0 && source_type != TypeManager.decimal_type) {
+ bool declared_only = source_type.IsStruct;
- MethodInfo method = null;
+ var operators = MemberCache.GetUserOperator (source_type, Operator.OpType.Implicit, declared_only);
+ if (operators != null) {
+ FindApplicableUserDefinedConversionOperators (operators, source, target_type, implicitOnly, ref candidates);
+ }
- foreach (MethodInfo m in ops) {
- if (TypeManager.TypeToCoreType (m.ReturnType) != most_specific_target)
- continue;
- if (TypeManager.GetParameterData (m).Types [0] != most_specific_source)
- continue;
- // Ambiguous: more than one conversion operator satisfies the signature.
- if (method != null)
- return null;
- method = m;
+ if (!implicitOnly) {
+ operators = MemberCache.GetUserOperator (source_type, Operator.OpType.Explicit, declared_only);
+ if (operators != null) {
+ FindApplicableUserDefinedConversionOperators (operators, source, target_type, false, ref candidates);
+ }
+ }
}
- return method;
- }
+ if ((target.Kind & user_conversion_kinds) != 0 && target != TypeManager.decimal_type) {
+ bool declared_only = target.IsStruct || implicitOnly;
- /// <summary>
- /// User-defined conversions
- /// </summary>
- static public Expression UserDefinedConversion (ResolveContext ec, Expression source,
- Type target, Location loc,
- bool look_for_explicit)
- {
- Type source_type = source.Type;
- MethodInfo method = null;
+ var operators = MemberCache.GetUserOperator (target_type, Operator.OpType.Implicit, declared_only);
+ if (operators != null) {
+ FindApplicableUserDefinedConversionOperators (operators, source, target_type, implicitOnly, ref candidates);
+ }
+
+ if (!implicitOnly) {
+ operators = MemberCache.GetUserOperator (target_type, Operator.OpType.Explicit, declared_only);
+ if (operators != null) {
+ FindApplicableUserDefinedConversionOperators (operators, source, target_type, false, ref candidates);
+ }
+ }
+ }
- object o;
- DoubleHash hash;
- if (look_for_explicit) {
- hash = explicit_conv;
+ if (candidates == null)
+ return null;
+
+ //
+ // Find the most specific conversion operator
+ //
+ MethodSpec most_specific_operator;
+ TypeSpec s_x, t_x;
+ if (candidates.Count == 1) {
+ most_specific_operator = candidates[0];
+ s_x = most_specific_operator.Parameters.Types[0];
+ t_x = most_specific_operator.ReturnType;
} else {
- // Implicit user operators cannot convert to interfaces
- if (target.IsInterface)
+ s_x = FindMostSpecificSource (candidates, source, !implicitOnly);
+ if (s_x == null)
return null;
- hash = implicit_conv;
- }
+ t_x = FindMostSpecificTarget (candidates, target, !implicitOnly);
+ if (t_x == null)
+ return null;
- 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);
+ most_specific_operator = candidates[0];
+
+ for (int i = 1; i < candidates.Count; ++i) {
+ if (candidates[i].ReturnType == t_x && candidates[i].Parameters.Types[0] == s_x) {
+ most_specific_operator = candidates[i];
+ break;
+ }
+ }
}
- if (method == null)
- return null;
+ //
+ // Convert input type when it's different to best operator argument
+ //
+ if (s_x != source.Type)
+ source = implicitOnly ?
+ ImplicitConversionStandard (ec, source, s_x, loc) :
+ ExplicitConversionStandard (ec, source, s_x, loc);
- Type most_specific_source = TypeManager.GetParameterData (method).Types [0];
+ source = new UserCast (most_specific_operator, source, loc).Resolve (ec);
//
- // 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.
+ // Convert result type when it's different to best operator return type
//
- if (look_for_explicit)
- source = ExplicitConversionStandard (ec, source, most_specific_source, loc);
- else
- source = ImplicitConversionStandard (ec, source, most_specific_source, loc);
+ if (t_x != target_type) {
+ //
+ // User operator is of T?, no need to lift it
+ //
+ if (TypeManager.IsNullableType (t_x) && t_x == target)
+ return source;
- if (source == null)
- return null;
+ source = implicitOnly ?
+ ImplicitConversionStandard (ec, source, target_type, loc) :
+ ExplicitConversionStandard (ec, source, target_type, loc);
+ }
+
+ //
+ // Source expression is of nullable type, lift the result in case of it's null
+ //
+ if (unwrap != null && (TypeManager.IsReferenceType (target) || target_type != target))
+ source = new Nullable.Lifted (source, unwrap, target).Resolve (ec);
+ else if (target_type != target)
+ source = Nullable.Wrap.Create (source, target);
- return new UserCast (method, source, loc).DoResolve (ec);
+ return source;
}
/// <summary>
/// in a context that expects a `target_type'.
/// </summary>
static public Expression ImplicitConversion (ResolveContext ec, Expression expr,
- Type target_type, Location loc)
+ TypeSpec target_type, Location loc)
{
Expression e;
/// user defined implicit conversions are excluded.
/// </summary>
static public Expression ImplicitConversionStandard (ResolveContext ec, Expression expr,
- Type target_type, Location loc)
+ TypeSpec target_type, Location loc)
{
return ImplicitConversionStandard (ec, expr, target_type, loc, false);
}
- static Expression ImplicitConversionStandard (ResolveContext ec, Expression expr, Type target_type, Location loc, bool explicit_cast)
+ static Expression ImplicitConversionStandard (ResolveContext ec, Expression expr, TypeSpec target_type, Location loc, bool explicit_cast)
{
if (expr.eclass == ExprClass.MethodGroup){
if (!TypeManager.IsDelegateType (target_type)){
}
}
- Type expr_type = expr.Type;
+ TypeSpec expr_type = expr.Type;
Expression e;
- if (expr_type.Equals (target_type)) {
- if (expr_type != TypeManager.null_type && expr_type != InternalType.AnonymousMethod)
+ if (expr_type == target_type) {
+ if (expr_type != InternalType.Null && expr_type != InternalType.AnonymousMethod)
return expr;
return null;
}
- if (TypeManager.IsVariantOf (expr_type, target_type)) {
- return expr;
+ if (expr_type == InternalType.Dynamic) {
+ switch (target_type.Kind) {
+ case MemberKind.ArrayType:
+ case MemberKind.Class:
+ if (target_type == TypeManager.object_type)
+ return EmptyCast.Create (expr, target_type);
+
+ goto case MemberKind.Struct;
+ case MemberKind.Struct:
+ case MemberKind.Delegate:
+ case MemberKind.Enum:
+ case MemberKind.Interface:
+ case MemberKind.TypeParameter:
+ Arguments args = new Arguments (1);
+ args.Add (new Argument (expr));
+ return new DynamicConversion (target_type, 0, args, loc).Resolve (ec);
+ }
+
+ return null;
}
if (TypeManager.IsNullableType (target_type))
Constant c = expr as Constant;
if (c != null) {
try {
- c = c.ConvertImplicitly (target_type);
+ c = c.ConvertImplicitly (ec, target_type);
} catch {
Console.WriteLine ("Conversion error happened in line {0}", loc);
throw;
if (e != null)
return e;
- if (expr is IntConstant && TypeManager.IsEnumType (target_type)){
- Constant i = (Constant) expr;
+ if (expr is IntegralConstant && TypeManager.IsEnumType (target_type)){
+ var i = (IntegralConstant) expr;
//
- // LAMESPEC: Conversion from any 0 constant is allowed
+ // LAMESPEC: csc allows any constant like 0 values to be converted, including const float f = 0.0
//
// 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 (i.IsZeroInteger) {
+ // Recreate 0 literal to remove any collected conversions
+ return new EnumConstant (new IntLiteral (0, i.Location), 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)
+ if (expr_type == InternalType.Null && target_type.IsPointer)
return EmptyCast.Create (new NullPointer (loc), target_type);
}
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)
/// an error is signaled
/// </summary>
static public Expression ImplicitConversionRequired (ResolveContext ec, Expression source,
- Type target_type, Location loc)
+ TypeSpec target_type, Location loc)
{
Expression e = ImplicitConversion (ec, source, target_type, loc);
if (e != null)
/// Int16->UIntPtr
///
/// </summary>
- public static Expression ExplicitNumericConversion (Expression expr, Type target_type)
+ public static Expression ExplicitNumericConversion (Expression expr, TypeSpec target_type)
{
- Type expr_type = expr.Type;
- Type real_target_type = target_type;
+ TypeSpec expr_type = expr.Type;
+ TypeSpec real_target_type = target_type;
if (expr_type == TypeManager.sbyte_type){
//
/// Returns whether an explicit reference conversion can be performed
/// from source_type to target_type
/// </summary>
- public static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
+ public static bool ExplicitReferenceConversionExists (TypeSpec source_type, TypeSpec target_type)
{
Expression e = ExplicitReferenceConversion (null, source_type, target_type);
if (e == null)
/// <summary>
/// Implements Explicit Reference conversions
/// </summary>
- static Expression ExplicitReferenceConversion (Expression source, Type source_type, Type target_type)
+ static Expression ExplicitReferenceConversion (Expression source, TypeSpec source_type, TypeSpec target_type)
{
- bool target_is_value_type = TypeManager.IsStruct (target_type);
-
//
// From object to a generic parameter
//
//
// Explicit type parameter conversion.
//
- if (TypeManager.IsGenericParameter (source_type))
+ if (source_type.Kind == MemberKind.TypeParameter)
return ExplicitTypeParameterConversion (source, source_type, target_type);
- //
- // From object to any reference type or value type (unboxing)
- //
- 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);
+ bool target_is_value_type = TypeManager.IsStruct (target_type) || TypeManager.IsEnumType (target_type);
//
- // Unboxing conversion from the types object and System.ValueType to any non-nullable-value-type
+ // Unboxing conversion from System.ValueType to any non-nullable-value-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
+ // From object to any reference type or value type (unboxing)
//
- if (TypeManager.IsSubclassOf (target_type, source_type))
- return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
+ if (source_type == TypeManager.object_type)
+ return
+ source == null ? EmptyExpression.Null :
+ target_is_value_type ? new UnboxCast (source, target_type) :
+ source is Constant ? (Expression) new EmptyConstantCast ((Constant) source, target_type) :
+ 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.
+ // From any class S to any class-type T, provided S is a base class of T
//
- if (target_type.IsInterface && !source_type.IsSealed &&
- !TypeManager.ImplementsInterface (source_type, target_type)) {
+ if (source_type.Kind == MemberKind.Class && TypeSpec.IsBaseClass (target_type, source_type, true))
return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
- }
//
// 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) {
- if (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type)) {
+ if (!target_type.IsSealed || target_type.ImplementsInterface (source_type)) {
if (target_type.IsClass)
return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
}
//
- // From System.Collecitons.Generic.IList<T> and its base interfaces to a one-dimensional
+ // From System.Collections.Generic.IList<T> and its base interfaces to a one-dimensional
// array type S[], provided there is an implicit or explicit reference conversion from S to T.
//
- if (IList_To_Array (source_type, target_type))
+ var target_array = target_type as ArrayContainer;
+ if (target_array != null && IList_To_Array (source_type, target_array))
return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
return null;
}
- if (source_type.IsArray) {
- if (target_type.IsArray) {
+ var source_array = source_type as ArrayContainer;
+ if (source_array != null) {
+ var target_array = target_type as ArrayContainer;
+ if (target_array != null) {
//
// From System.Array to any array-type
//
// * 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_array.Rank == target_array.Rank) {
- source_type = TypeManager.GetElementType (source_type);
+ source_type = source_array.Element;
if (!TypeManager.IsReferenceType (source_type))
return null;
- Type target_type_element = TypeManager.GetElementType (target_type);
- if (!TypeManager.IsReferenceType (target_type_element))
+ var target_element = target_array.Element;
+ if (!TypeManager.IsReferenceType (target_element))
return null;
- if (ExplicitReferenceConversionExists (source_type, target_type_element))
+ if (ExplicitReferenceConversionExists (source_type, target_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))
+ if (ArrayToIList (source_array, target_type, true))
return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
return null;
}
+ //
+ // 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 && !source_type.ImplementsInterface (target_type)) {
+ return source == null ? EmptyExpression.Null : new ClassCast (source, target_type);
+ }
+
//
// From System delegate to any delegate-type
//
/// type is expr.Type to `target_type'.
/// </summary>
static public Expression ExplicitConversionCore (ResolveContext ec, Expression expr,
- Type target_type, Location loc)
+ TypeSpec target_type, Location loc)
{
- Type expr_type = expr.Type;
+ TypeSpec 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, true);
return ne;
if (TypeManager.IsEnumType (expr_type)) {
- Expression underlying = EmptyCast.Create (expr, TypeManager.GetEnumUnderlyingType (expr_type));
- expr = ExplicitConversionCore (ec, underlying, target_type, loc);
- if (expr != null)
- return expr;
+ TypeSpec real_target = TypeManager.IsEnumType (target_type) ? EnumSpec.GetUnderlyingType (target_type) : target_type;
+ Expression underlying = EmptyCast.Create (expr, EnumSpec.GetUnderlyingType (expr_type));
+ if (underlying.Type == real_target)
+ ne = underlying;
- return ExplicitUserConversion (ec, underlying, target_type, loc);
+ if (ne == null)
+ ne = ImplicitNumericConversion (underlying, real_target);
+
+ if (ne == null)
+ ne = ExplicitNumericConversion (underlying, real_target);
+
+ //
+ // LAMESPEC: IntPtr and UIntPtr conversion to any Enum is allowed
+ //
+ if (ne == null && (real_target == TypeManager.intptr_type || real_target == TypeManager.uintptr_type))
+ ne = ExplicitUserConversion (ec, underlying, real_target, loc);
+
+ return ne != null ? EmptyCast.Create (ne, target_type) : null;
}
- if (TypeManager.IsEnumType (target_type)){
+ if (TypeManager.IsEnumType (target_type)) {
//
- // Type System.Enum can be unboxed to any enum-type
+ // System.Enum can be unboxed to any enum-type
//
if (expr_type == TypeManager.enum_type)
return new UnboxCast (expr, target_type);
- Expression ce = ExplicitConversionCore (ec, expr, TypeManager.GetEnumUnderlyingType (target_type), loc);
- if (ce != null)
- return EmptyCast.Create (ce, target_type);
-
+ TypeSpec real_target = TypeManager.IsEnumType (target_type) ? EnumSpec.GetUnderlyingType (target_type) : target_type;
+
+ if (expr_type == real_target)
+ return EmptyCast.Create (expr, target_type);
+
+ ne = ImplicitNumericConversion (expr, real_target);
+ if (ne != null)
+ return EmptyCast.Create (ne, target_type);
+
+ ne = ExplicitNumericConversion (expr, real_target);
+ if (ne != null)
+ return EmptyCast.Create (ne, 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);
+ ne = ExplicitUserConversion (ec, expr, real_target, loc);
if (ne != null)
return ExplicitConversionCore (ec, ne, target_type, loc);
}
-
- return null;
+ } else {
+ ne = ExplicitNumericConversion (expr, target_type);
+ if (ne != null)
+ return ne;
}
- ne = ExplicitNumericConversion (expr, target_type);
- if (ne != null)
- return ne;
-
//
// Skip the ExplicitReferenceConversion because we can not convert
// from Null to a ValueType, and ExplicitReference wont check against
// null literal explicitly
//
- if (expr_type != TypeManager.null_type){
+ if (expr_type != InternalType.Null) {
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;
return null;
}
- public static Expression ExplicitUnsafe (Expression expr, Type target_type)
+ public static Expression ExplicitUnsafe (Expression expr, TypeSpec target_type)
{
- Type expr_type = expr.Type;
+ TypeSpec expr_type = expr.Type;
if (target_type.IsPointer){
if (expr_type.IsPointer)
if (expr_type == TypeManager.ushort_type ||
expr_type == TypeManager.uint32_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);
+
+ 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 || target_type == TypeManager.int64_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);
}
return null;
/// Same as ExplicitConversion, only it doesn't include user defined conversions
/// </summary>
static public Expression ExplicitConversionStandard (ResolveContext ec, Expression expr,
- Type target_type, Location l)
+ TypeSpec 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;
- 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);
/// type is expr.Type to `target_type'.
/// </summary>
static public Expression ExplicitConversion (ResolveContext ec, Expression expr,
- Type target_type, Location loc)
+ TypeSpec target_type, Location loc)
{
Expression e = ExplicitConversionCore (ec, expr, target_type, loc);
- if (e != null)
+ 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;
+ TypeSpec expr_type = expr.Type;
if (TypeManager.IsNullableType (target_type)) {
if (TypeManager.IsNullableType (expr_type)) {
- Type target = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (target_type)[0]);
+ TypeSpec target = Nullable.NullableInfo.GetUnderlyingType (target_type);
Expression unwrap = Nullable.Unwrap.Create (expr);
e = ExplicitConversion (ec, unwrap, target, expr.Location);
if (e == null)
} else if (expr_type == TypeManager.object_type) {
return new UnboxCast (expr, target_type);
} else {
- Type target = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (target_type) [0]);
+ TypeSpec target = 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, false);
+ e = ImplicitBoxingConversion (expr, Nullable.NullableInfo.GetUnderlyingType (expr_type), target_type);
+ if (e != null)
+ return e;
- 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 = Nullable.Unwrap.Create (expr, false);
+ e = ExplicitConversionCore (ec, e, target_type, loc);
if (e != null)
- e = EmptyCast.Create (e, target_type);
- return e;
+ return EmptyCast.Create (e, target_type);
}
e = ExplicitUserConversion (ec, expr, target_type, loc);
projects / mono.git / blobdiff