// A container class for all the conversion operations
//
public class Convert {
- static public void Error_CannotConvertType (Location loc, Type source, Type target)
+ //
+ // This is used to prettify the code: a null argument is allowed
+ // for ImplicitStandardConversion as long as it is known that
+ // no anonymous method will play a role.
+ //
+ // FIXME: renamed from `const' to `static' to allow bootstraping from older
+ // versions of the compiler that could not cope with this construct.
+ //
+ public static EmitContext ConstantEC = null;
+
+ static Expression TypeParameter_to_Null (Expression expr, Type target_type,
+ Location loc)
+ {
+ if (!TypeParameter_to_Null (target_type)) {
+ Report.Error (403, loc, "Cannot convert null to the type " +
+ "parameter `{0}' becaues it could be a value " +
+ "type. Consider using `default ({0})' instead.",
+ target_type);
+ return null;
+ }
+
+ return new NullCast (expr, target_type);
+ }
+
+ static bool TypeParameter_to_Null (Type target_type)
+ {
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (target_type);
+ if (gc == null)
+ return false;
+
+ if (gc.HasReferenceTypeConstraint)
+ return true;
+ if (gc.HasClassConstraint && !TypeManager.IsValueType (gc.ClassConstraint))
+ return true;
+
+ return false;
+ }
+
+ static Type TypeParam_EffectiveBaseType (EmitContext ec, GenericConstraints gc)
{
- Report.Error (30, loc, "Cannot convert type '" +
- TypeManager.CSharpName (source) + "' to '" +
- TypeManager.CSharpName (target) + "'");
+ ArrayList list = new ArrayList ();
+ list.Add (gc.EffectiveBaseClass);
+ foreach (Type t in gc.InterfaceConstraints) {
+ if (!t.IsGenericParameter)
+ continue;
+
+ GenericConstraints new_gc = TypeManager.GetTypeParameterConstraints (t);
+ if (new_gc != null)
+ list.Add (TypeParam_EffectiveBaseType (ec, new_gc));
+ }
+ return FindMostEncompassedType (ec, list);
+ }
+
+ static Expression ImplicitTypeParameterConversion (EmitContext ec, Expression expr,
+ Type target_type)
+ {
+ Type expr_type = expr.Type;
+
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (expr_type);
+
+ if (gc == null) {
+ if (target_type == TypeManager.object_type)
+ return new BoxedCast (expr, target_type);
+
+ return null;
+ }
+
+ // We're converting from a type parameter which is known to be a reference type.
+ Type base_type = TypeParam_EffectiveBaseType (ec, gc);
+
+ if (TypeManager.IsSubclassOf (base_type, target_type))
+ return new ClassCast (expr, target_type);
+
+ if (target_type.IsInterface) {
+ if (TypeManager.ImplementsInterface (base_type, target_type))
+ return new ClassCast (expr, target_type);
+
+ foreach (Type t in gc.InterfaceConstraints) {
+ if (TypeManager.IsSubclassOf (t, target_type))
+ return new ClassCast (expr, target_type);
+ }
+ }
+
+ foreach (Type t in gc.InterfaceConstraints) {
+ if (!t.IsGenericParameter)
+ continue;
+ if (TypeManager.IsSubclassOf (t, target_type))
+ return new ClassCast (expr, target_type);
+ }
+
+ return null;
}
static EmptyExpression MyEmptyExpr;
- static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
+ static public Expression ImplicitReferenceConversion (EmitContext ec, Expression expr, Type target_type)
{
Type expr_type = expr.Type;
expr.Emit (null);
}
+ if (expr_type == TypeManager.void_type)
+ return null;
+
+ if (expr_type.IsGenericParameter)
+ return ImplicitTypeParameterConversion (ec, expr, target_type);
+
//
// notice that it is possible to write "ValueType v = 1", the ValueType here
// is an abstract class, and not really a value type, so we apply the same rules.
if (expr_type.IsPointer)
return null;
- if (expr_type.IsValueType)
- return new BoxedCast (expr);
- if (expr_type.IsClass || expr_type.IsInterface || expr_type == TypeManager.enum_type)
+ if (TypeManager.IsValueType (expr_type))
+ return new BoxedCast (expr, target_type);
+ if (expr_type.IsClass || expr_type.IsInterface || expr_type == TypeManager.enum_type){
+ if (expr_type == TypeManager.anonymous_method_type)
+ return null;
return new EmptyCast (expr, target_type);
+ }
+
+ return null;
} else if (target_type == TypeManager.value_type) {
- if (expr_type.IsValueType)
- return new BoxedCast (expr);
- if (expr is NullLiteral)
- return new BoxedCast (expr);
- } else if (expr_type.IsSubclassOf (target_type)) {
+ if (TypeManager.IsValueType (expr_type))
+ return new BoxedCast (expr, target_type);
+ if (expr_type == TypeManager.null_type)
+ return new NullCast (expr, target_type);
+
+ return null;
+ } else if (TypeManager.IsSubclassOf (expr_type, target_type)) {
//
// Special case: enumeration to System.Enum.
// System.Enum is not a value type, it is a class, so we need
// a boxing conversion
//
- if (expr_type.IsEnum)
- return new BoxedCast (expr);
+ if (expr_type.IsEnum || expr_type.IsGenericParameter)
+ return new BoxedCast (expr, target_type);
return new EmptyCast (expr, target_type);
- } else {
+ }
- // 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
+ // 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
- // from the null type to any reference-type.
- if (expr is NullLiteral){
- if (target_type.IsPointer)
- return NullPointer.Null;
+ // from the null type to any reference-type.
+ if (expr_type == TypeManager.null_type){
+ if (target_type.IsPointer)
+ return new EmptyCast (NullPointer.Null, target_type);
- if (!target_type.IsValueType)
- return new NullCast (expr, target_type);
- }
+ if (!target_type.IsValueType)
+ return new NullCast (expr, target_type);
+ }
- // from any class-type S to any interface-type T.
- if (target_type.IsInterface) {
- if (TypeManager.ImplementsInterface (expr_type, target_type)){
- if (expr_type.IsClass)
- return new EmptyCast (expr, target_type);
- else if (expr_type.IsValueType)
- return new BoxedCast (expr, target_type);
- }
+ // from any class-type S to any interface-type T.
+ if (target_type.IsInterface) {
+ if (target_type != TypeManager.iconvertible_type &&
+ expr_type.IsValueType && (expr is Constant) &&
+ !(expr is IntLiteral || expr is BoolLiteral ||
+ expr is FloatLiteral || expr is DoubleLiteral ||
+ expr is LongLiteral || expr is CharLiteral ||
+ expr is StringLiteral || expr is DecimalLiteral ||
+ expr is UIntLiteral || expr is ULongLiteral)) {
+ return null;
}
- // from any interface type S to interface-type T.
- if (expr_type.IsInterface && target_type.IsInterface) {
- if (TypeManager.ImplementsInterface (expr_type, target_type))
- return new EmptyCast (expr, target_type);
+ if (TypeManager.ImplementsInterface (expr_type, target_type)){
+ if (expr_type.IsGenericParameter || TypeManager.IsValueType (expr_type))
+ return new BoxedCast (expr, target_type);
else
- return null;
+ return new EmptyCast (expr, 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 ()) {
+ }
+
+ // from any interface type S to interface-type T.
+ if (expr_type.IsInterface && target_type.IsInterface) {
+ if (TypeManager.ImplementsInterface (expr_type, target_type))
+ return new EmptyCast (expr, target_type);
+ else
+ return null;
+ }
- Type expr_element_type = TypeManager.GetElementType (expr_type);
+ // from an array-type S to an array-type of type T
+ if (expr_type.IsArray && target_type.IsArray) {
+ if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
- if (MyEmptyExpr == null)
- MyEmptyExpr = new EmptyExpression ();
+ Type expr_element_type = TypeManager.GetElementType (expr_type);
+
+ if (MyEmptyExpr == null)
+ MyEmptyExpr = new EmptyExpression ();
- MyEmptyExpr.SetType (expr_element_type);
- Type target_element_type = TypeManager.GetElementType (target_type);
+ MyEmptyExpr.SetType (expr_element_type);
+ Type target_element_type = TypeManager.GetElementType (target_type);
- if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
- if (ImplicitStandardConversionExists (MyEmptyExpr,
+ if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
+ if (ImplicitStandardConversionExists (ConstantEC, MyEmptyExpr,
target_element_type))
- return new EmptyCast (expr, target_type);
- }
+ return new EmptyCast (expr, target_type);
}
+ }
-
- // from an array-type to System.Array
- if (expr_type.IsArray && target_type == TypeManager.array_type)
- return new EmptyCast (expr, target_type);
-
- // from any delegate type to System.Delegate
- if ((expr_type == TypeManager.delegate_type ||
- expr_type.IsSubclassOf (TypeManager.delegate_type)) &&
- target_type == TypeManager.delegate_type)
- return new EmptyCast (expr, target_type);
+ // from an array-type to System.Array
+ if (expr_type.IsArray && target_type == TypeManager.array_type)
+ return new EmptyCast (expr, target_type);
+
+ // from an array-type of type T to IEnumerable<T>
+ if (expr_type.IsArray && TypeManager.IsIEnumerable (expr_type, target_type))
+ return new EmptyCast (expr, target_type);
+
+ // from any delegate type to System.Delegate
+ if ((expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type)) &&
+ target_type == TypeManager.delegate_type)
+ return new EmptyCast (expr, target_type);
- // from any array-type or delegate type into System.ICloneable.
- if (expr_type.IsArray ||
- expr_type == TypeManager.delegate_type ||
- expr_type.IsSubclassOf (TypeManager.delegate_type))
- if (target_type == TypeManager.icloneable_type)
- return new EmptyCast (expr, target_type);
-
- return null;
+ // from any array-type or delegate type into System.ICloneable.
+ if (expr_type.IsArray ||
+ expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type))
+ if (target_type == TypeManager.icloneable_type)
+ return new EmptyCast (expr, target_type);
+
+ // from a generic type definition to a generic instance.
+ if (TypeManager.IsEqual (expr_type, target_type))
+ return new EmptyCast (expr, target_type);
- }
-
return null;
}
// Tests whether an implicit reference conversion exists between expr_type
// and target_type
//
- public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
+ public static bool ImplicitReferenceConversionExists (EmitContext ec, Expression expr, Type target_type)
{
+ if (target_type.IsValueType)
+ return false;
+
Type expr_type = expr.Type;
+ if (expr_type.IsGenericParameter)
+ return ImplicitTypeParameterConversion (ec, expr, target_type) != null;
+
//
// This is the boxed case.
//
if (target_type == TypeManager.object_type) {
- if (expr_type.IsClass || expr_type.IsValueType ||
+ if (expr_type.IsClass || TypeManager.IsValueType (expr_type) ||
expr_type.IsInterface || expr_type == TypeManager.enum_type)
+ if (target_type != TypeManager.anonymous_method_type)
return true;
- } else if (expr_type.IsSubclassOf (target_type)) {
+
+ return false;
+ } else if (TypeManager.IsSubclassOf (expr_type, target_type))
return true;
- } else {
- // Please remember that all code below actually comes
- // from ImplicitReferenceConversion so make sure code remains in sync
+
+ // Please remember that all code below actually comes
+ // from ImplicitReferenceConversion so make sure code remains in sync
- // from any class-type S to any interface-type T.
- if (target_type.IsInterface) {
- if (TypeManager.ImplementsInterface (expr_type, target_type))
- return true;
+ // from any class-type S to any interface-type T.
+ if (target_type.IsInterface) {
+ if (target_type != TypeManager.iconvertible_type &&
+ expr_type.IsValueType && (expr is Constant) &&
+ !(expr is IntLiteral || expr is BoolLiteral ||
+ expr is FloatLiteral || expr is DoubleLiteral ||
+ expr is LongLiteral || expr is CharLiteral ||
+ expr is StringLiteral || expr is DecimalLiteral ||
+ expr is UIntLiteral || expr is ULongLiteral)) {
+ return false;
}
- // from any interface type S to interface-type T.
- if (expr_type.IsInterface && target_type.IsInterface)
- if (TypeManager.ImplementsInterface (expr_type, target_type))
- return true;
+ if (TypeManager.ImplementsInterface (expr_type, target_type))
+ return true;
+ }
+
+ // from any interface type S to interface-type T.
+ if (expr_type.IsInterface && target_type.IsInterface)
+ if (TypeManager.ImplementsInterface (expr_type, target_type))
+ return true;
- // from an array-type S to an array-type of type T
- if (expr_type.IsArray && target_type.IsArray) {
- if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
+ // from an array-type S to an array-type of type T
+ if (expr_type.IsArray && target_type.IsArray) {
+ if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
- Type expr_element_type = expr_type.GetElementType ();
+ Type expr_element_type = expr_type.GetElementType ();
- if (MyEmptyExpr == null)
- MyEmptyExpr = new EmptyExpression ();
+ if (MyEmptyExpr == null)
+ MyEmptyExpr = new EmptyExpression ();
- MyEmptyExpr.SetType (expr_element_type);
- Type target_element_type = TypeManager.GetElementType (target_type);
+ MyEmptyExpr.SetType (expr_element_type);
+ Type target_element_type = TypeManager.GetElementType (target_type);
- if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
- if (ImplicitStandardConversionExists (MyEmptyExpr,
+ if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
+ if (ImplicitStandardConversionExists (ConstantEC, MyEmptyExpr,
target_element_type))
- return true;
- }
+ return true;
}
+ }
- // from an array-type to System.Array
- if (expr_type.IsArray && (target_type == TypeManager.array_type))
+ // from an array-type to System.Array
+ if (expr_type.IsArray && (target_type == TypeManager.array_type))
+ return true;
+
+ // from an array-type of type T to IEnumerable<T>
+ if (expr_type.IsArray && TypeManager.IsIEnumerable (expr_type, target_type))
+ return true;
+
+ // from any delegate type to System.Delegate
+ if ((expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type)) &&
+ target_type == TypeManager.delegate_type)
+ if (target_type.IsAssignableFrom (expr_type))
return true;
-
- // from any delegate type to System.Delegate
- if ((expr_type == TypeManager.delegate_type ||
- expr_type.IsSubclassOf (TypeManager.delegate_type)) &&
- target_type == TypeManager.delegate_type)
- if (target_type.IsAssignableFrom (expr_type))
- return true;
- // from any array-type or delegate type into System.ICloneable.
- if (expr_type.IsArray ||
- expr_type == TypeManager.delegate_type ||
- expr_type.IsSubclassOf (TypeManager.delegate_type))
- if (target_type == TypeManager.icloneable_type)
- return true;
-
- // from the null type to any reference-type.
- if (expr is NullLiteral && !target_type.IsValueType &&
- !TypeManager.IsEnumType (target_type))
+ // from any array-type or delegate type into System.ICloneable.
+ if (expr_type.IsArray ||
+ expr_type == TypeManager.delegate_type || TypeManager.IsDelegateType (expr_type))
+ if (target_type == TypeManager.icloneable_type)
return true;
+ // from the null type to any reference-type.
+ if (expr_type == TypeManager.null_type){
+ if (target_type.IsPointer)
+ return true;
+
+ if (!target_type.IsValueType)
+ return true;
}
+
+ // from a generic type definition to a generic instance.
+ if (TypeManager.IsEqual (expr_type, target_type))
+ return true;
+
return false;
}
/// target_type or null if an implicit conversion is not possible.
/// </summary>
static public Expression ImplicitNumericConversion (EmitContext ec, Expression expr,
- Type target_type, Location loc)
+ Type target_type)
{
Type expr_type = expr.Type;
-
+
//
// Attempt to do the implicit constant expression conversions
if (expr is Constant){
-
if (expr is IntConstant){
Expression e;
// we just inline it
//
long v = ((LongConstant) expr).Value;
- if (v > 0)
- return new ULongConstant ((ulong) v);
+ if (v >= 0)
+ return new ULongConstant ((ulong) v, expr.Location);
}
}
if (expr_type == TypeManager.sbyte_type){
//
- // From sbyte to short, int, long, float, double.
+ // 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);
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);
} else if (expr_type == TypeManager.byte_type){
//
- // From byte to short, ushort, int, uint, long, ulong, float, double
+ // 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) ||
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);
+
} else if (expr_type == TypeManager.short_type){
//
- // From short to int, long, float, double
+ // From short to int, long, float, double, decimal
//
if (real_target_type == TypeManager.int32_type)
return new EmptyCast (expr, target_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);
+
} else if (expr_type == TypeManager.ushort_type){
//
- // From ushort to int, uint, long, ulong, float, double
+ // From ushort to int, uint, long, ulong, float, double, decimal
//
if (real_target_type == TypeManager.uint32_type)
return new EmptyCast (expr, target_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);
} else if (expr_type == TypeManager.int32_type){
//
- // From int to long, float, double
+ // From int to long, float, double, decimal
//
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
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);
} else if (expr_type == TypeManager.uint32_type){
//
- // From uint to long, ulong, float, double
+ // 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.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);
} 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);
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ if (real_target_type == TypeManager.decimal_type)
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.uint64_type){
//
// From ulong to float, double
OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R4);
+ OpCodes.Conv_R4);
+ if (real_target_type == TypeManager.decimal_type)
+ return new CastToDecimal (expr);
} else if (expr_type == TypeManager.char_type){
//
- // From char to ushort, int, uint, long, ulong, float, double
+ // From char to ushort, int, uint, long, ulong, float, double, decimal
//
if ((real_target_type == TypeManager.ushort_type) ||
(real_target_type == TypeManager.int32_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);
} else if (expr_type == TypeManager.float_type){
//
// float to double
return null;
}
-
/// <summary>
/// Same as ImplicitStandardConversionExists except that it also looks at
/// implicit user defined conversions - needed for overload resolution
/// </summary>
public static bool ImplicitConversionExists (EmitContext ec, Expression expr, Type target_type)
{
- if (ImplicitStandardConversionExists (expr, target_type))
+ if (expr is NullLiteral) {
+ if (target_type.IsGenericParameter)
+ return TypeParameter_to_Null (target_type);
+
+ if (TypeManager.IsNullableType (target_type))
+ return true;
+ }
+
+ if (ImplicitStandardConversionExists (ec, expr, target_type))
return true;
Expression dummy = ImplicitUserConversion (ec, expr, target_type, Location.Null);
public static bool ImplicitUserConversionExists (EmitContext ec, Type source, Type target)
{
- Expression dummy = ImplicitUserConversion (
- ec, new EmptyExpression (source), target, Location.Null);
- return dummy != null;
+ return ImplicitUserConversion (ec, new EmptyExpression (source), target, Location.Null) != null;
}
/// <summary>
/// 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 (EmitContext ec, Expression expr, Type target_type)
{
Type expr_type = expr.Type;
//Console.WriteLine ("Expr is {0}", expr);
//Console.WriteLine ("{0} -> {1} ?", expr_type, target_type);
- if (expr_type == target_type)
+ if (expr_type.Equals (target_type))
return true;
+
// First numeric conversions
if (expr_type == TypeManager.sbyte_type){
//
- // From sbyte to short, int, long, float, double.
+ // From sbyte to short, int, long, float, double, decimal
//
if ((target_type == TypeManager.int32_type) ||
(target_type == TypeManager.int64_type) ||
} else if (expr_type == TypeManager.byte_type){
//
- // From byte to short, ushort, int, uint, long, ulong, float, double
+ // From byte to short, ushort, int, uint, long, ulong, float, double, decimal
//
if ((target_type == TypeManager.short_type) ||
(target_type == TypeManager.ushort_type) ||
} else if (expr_type == TypeManager.short_type){
//
- // From short to int, long, float, double
+ // From short to int, long, double, float, decimal
//
if ((target_type == TypeManager.int32_type) ||
(target_type == TypeManager.int64_type) ||
} else if (expr_type == TypeManager.ushort_type){
//
- // From ushort to int, uint, long, ulong, float, double
+ // From ushort to int, uint, long, ulong, double, float, decimal
//
if ((target_type == TypeManager.uint32_type) ||
(target_type == TypeManager.uint64_type) ||
} else if (expr_type == TypeManager.int32_type){
//
- // From int to long, float, double
+ // From int to long, double, float, decimal
//
if ((target_type == TypeManager.int64_type) ||
(target_type == TypeManager.double_type) ||
} else if (expr_type == TypeManager.uint32_type){
//
- // From uint to long, ulong, float, double
+ // From uint to long, ulong, double, float, decimal
//
if ((target_type == TypeManager.int64_type) ||
(target_type == TypeManager.uint64_type) ||
} else if ((expr_type == TypeManager.uint64_type) ||
(expr_type == TypeManager.int64_type)) {
//
- // From long/ulong to float, double
+ // From long/ulong to double, float, decimal
//
if ((target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
} else if (expr_type == TypeManager.char_type){
//
- // From char to ushort, int, uint, long, ulong, float, double
+ // From char to ushort, int, uint, ulong, long, float, double, decimal
//
if ((target_type == TypeManager.ushort_type) ||
(target_type == TypeManager.int32_type) ||
return true;
}
- if (ImplicitReferenceConversionExists (expr, target_type))
- return true;
+ if (expr.eclass == ExprClass.MethodGroup){
+ if (TypeManager.IsDelegateType (target_type) && RootContext.Version != LanguageVersion.ISO_1){
+ MethodGroupExpr mg = expr as MethodGroupExpr;
+ if (mg != null){
+ //
+ // This should not happen frequently, so we can create an object
+ // to test compatibility
+ //
+ Expression c = ImplicitDelegateCreation.Create (
+ ec, mg, target_type, true, Location.Null);
+ return c != null;
+ }
+ }
+ }
+ if (ImplicitReferenceConversionExists (ec, expr, target_type))
+ return true;
+
+ //
+ // Implicit Constant Expression Conversions
+ //
if (expr is IntConstant){
int value = ((IntConstant) expr).Value;
if (value >= SByte.MinValue && value <= SByte.MaxValue)
return true;
} else if (target_type == TypeManager.byte_type){
- if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
+ if (value >= 0 && value <= Byte.MaxValue)
return true;
} else if (target_type == TypeManager.short_type){
if (value >= Int16.MinValue && value <= Int16.MaxValue)
// we just inline it
//
long v = ((LongConstant) expr).Value;
- if (v > 0)
+ if (v >= 0)
return true;
}
return true;
}
+ //
+ // If `expr_type' implements `target_type' (which is an iface)
+ // see TryImplicitIntConversion
+ //
+ if (target_type.IsInterface && target_type.IsAssignableFrom (expr_type))
+ return true;
+
if (target_type == TypeManager.void_ptr_type && expr_type.IsPointer)
return true;
+ if (TypeManager.IsNullableType (expr_type) && TypeManager.IsNullableType (target_type))
+ return true;
+
+ if (expr_type == TypeManager.anonymous_method_type){
+ if (!TypeManager.IsDelegateType (target_type))
+ return false;
+
+ AnonymousMethod am = (AnonymousMethod) expr;
+
+ Expression conv = am.Compatible (ec, target_type, true);
+ if (conv != null)
+ return true;
+ }
+
return false;
}
- //
- // Used internally by FindMostEncompassedType, this is used
- // to avoid creating lots of objects in the tight loop inside
- // FindMostEncompassedType
- //
- static EmptyExpression priv_fmet_param;
-
/// <summary>
/// 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 (EmitContext ec, ArrayList types)
{
Type best = null;
- if (priv_fmet_param == null)
- priv_fmet_param = new EmptyExpression ();
+ if (types.Count == 0)
+ return null;
+
+ if (types.Count == 1)
+ return (Type) types [0];
- foreach (Type t in types){
- priv_fmet_param.SetType (t);
-
+ EmptyExpression expr = EmptyExpression.Grab ();
+
+ foreach (Type t in types) {
if (best == null) {
best = t;
continue;
}
-
- if (ImplicitStandardConversionExists (priv_fmet_param, best))
+
+ expr.SetType (t);
+ if (ImplicitStandardConversionExists (ec, expr, best))
best = t;
}
+ expr.SetType (best);
+ foreach (Type t in types) {
+ if (best == t)
+ continue;
+ if (!ImplicitStandardConversionExists (ec, expr, t)) {
+ best = null;
+ break;
+ }
+ }
+
+ EmptyExpression.Release (expr);
+
return best;
}
-
- //
- // Used internally by FindMostEncompassingType, this is used
- // to avoid creating lots of objects in the tight loop inside
- // FindMostEncompassingType
- //
- static EmptyExpression priv_fmee_ret;
-
+
/// <summary>
/// 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 (EmitContext ec, ArrayList types)
{
Type best = null;
- if (priv_fmee_ret == null)
- priv_fmee_ret = new EmptyExpression ();
+ if (types.Count == 0)
+ return null;
+
+ if (types.Count == 1)
+ return (Type) types [0];
- foreach (Type t in types){
- priv_fmee_ret.SetType (best);
+ EmptyExpression expr = EmptyExpression.Grab ();
+ foreach (Type t in types) {
if (best == null) {
best = t;
continue;
}
- if (ImplicitStandardConversionExists (priv_fmee_ret, t))
+ expr.SetType (best);
+ if (ImplicitStandardConversionExists (ec, expr, t))
best = t;
}
-
+
+ foreach (Type t in types) {
+ if (best == t)
+ continue;
+ expr.SetType (t);
+ if (!ImplicitStandardConversionExists (ec, expr, best)) {
+ best = null;
+ break;
+ }
+ }
+
+ EmptyExpression.Release (expr);
+
return best;
}
- //
- // Used to avoid creating too many objects
- //
- static EmptyExpression priv_fms_expr;
-
/// <summary>
/// Finds the most specific source Sx according to the rules of the spec (13.4.4)
/// by making use of FindMostEncomp* methods. Applies the correct rules separately
/// for explicit and implicit conversion operators.
/// </summary>
- static public Type FindMostSpecificSource (MethodGroupExpr me, Expression source,
- bool apply_explicit_conv_rules,
- Location loc)
+ static public Type FindMostSpecificSource (EmitContext ec, IList list,
+ Expression source, bool apply_explicit_conv_rules)
{
ArrayList src_types_set = new ArrayList ();
- if (priv_fms_expr == null)
- priv_fms_expr = new EmptyExpression ();
-
//
// If any operator converts from S then Sx = S
//
Type source_type = source.Type;
- foreach (MethodBase mb in me.Methods){
- ParameterData pd = Invocation.GetParameterData (mb);
+ foreach (MethodBase mb in list){
+ ParameterData pd = TypeManager.GetParameterData (mb);
Type param_type = pd.ParameterType (0);
if (param_type == source_type)
return param_type;
- if (apply_explicit_conv_rules) {
- //
- // From the spec :
- // Find the set of applicable user-defined conversion operators, U. This set
- // consists of the
- // user-defined implicit or explicit conversion operators declared by
- // the classes or structs in D that convert from a type encompassing
- // or encompassed by S to a type encompassing or encompassed by T
- //
- priv_fms_expr.SetType (param_type);
- if (ImplicitStandardConversionExists (priv_fms_expr, source_type))
- src_types_set.Add (param_type);
- else {
- if (ImplicitStandardConversionExists (source, param_type))
- src_types_set.Add (param_type);
- }
- } else {
- //
- // Only if S is encompassed by param_type
- //
- if (ImplicitStandardConversionExists (source, param_type))
- src_types_set.Add (param_type);
- }
+ src_types_set.Add (param_type);
}
//
ArrayList candidate_set = new ArrayList ();
foreach (Type param_type in src_types_set){
- if (ImplicitStandardConversionExists (source, param_type))
+ if (ImplicitStandardConversionExists (ec, source, param_type))
candidate_set.Add (param_type);
}
if (candidate_set.Count != 0)
- return FindMostEncompassedType (candidate_set);
+ return FindMostEncompassedType (ec, candidate_set);
}
//
// Final case
//
if (apply_explicit_conv_rules)
- return FindMostEncompassingType (src_types_set);
+ return FindMostEncompassingType (ec, src_types_set);
else
- return FindMostEncompassedType (src_types_set);
+ return FindMostEncompassedType (ec, src_types_set);
}
- //
- // Useful in avoiding proliferation of objects
- //
- static EmptyExpression priv_fmt_expr;
-
/// <summary>
/// Finds the most specific target Tx according to section 13.4.4
/// </summary>
- static public Type FindMostSpecificTarget (MethodGroupExpr me, Type target,
- bool apply_explicit_conv_rules,
- Location loc)
+ static public Type FindMostSpecificTarget (EmitContext ec, IList list,
+ Type target, bool apply_explicit_conv_rules)
{
ArrayList tgt_types_set = new ArrayList ();
- if (priv_fmt_expr == null)
- priv_fmt_expr = new EmptyExpression ();
-
//
// If any operator converts to T then Tx = T
//
- foreach (MethodInfo mi in me.Methods){
+ foreach (MethodInfo mi in list){
Type ret_type = mi.ReturnType;
-
if (ret_type == target)
return ret_type;
- if (apply_explicit_conv_rules) {
- //
- // From the spec :
- // Find the set of applicable user-defined conversion operators, U.
- //
- // This set consists of the
- // user-defined implicit or explicit conversion operators declared by
- // the classes or structs in D that convert from a type encompassing
- // or encompassed by S to a type encompassing or encompassed by T
- //
- priv_fms_expr.SetType (ret_type);
- if (ImplicitStandardConversionExists (priv_fms_expr, target))
- tgt_types_set.Add (ret_type);
- else {
- priv_fms_expr.SetType (target);
- if (ImplicitStandardConversionExists (priv_fms_expr, ret_type))
- tgt_types_set.Add (ret_type);
- }
- } else {
- //
- // Only if T is encompassed by param_type
- //
- priv_fms_expr.SetType (ret_type);
- if (ImplicitStandardConversionExists (priv_fms_expr, target))
- tgt_types_set.Add (ret_type);
- }
+ tgt_types_set.Add (ret_type);
}
//
if (apply_explicit_conv_rules) {
ArrayList candidate_set = new ArrayList ();
+ EmptyExpression expr = EmptyExpression.Grab ();
+
foreach (Type ret_type in tgt_types_set){
- priv_fmt_expr.SetType (ret_type);
+ expr.SetType (ret_type);
- if (ImplicitStandardConversionExists (priv_fmt_expr, target))
+ if (ImplicitStandardConversionExists (ec, expr, target))
candidate_set.Add (ret_type);
}
+ EmptyExpression.Release (expr);
+
if (candidate_set.Count != 0)
- return FindMostEncompassingType (candidate_set);
+ return FindMostEncompassingType (ec, candidate_set);
}
//
// Okay, final case !
//
if (apply_explicit_conv_rules)
- return FindMostEncompassedType (tgt_types_set);
+ return FindMostEncompassedType (ec, tgt_types_set);
else
- return FindMostEncompassingType (tgt_types_set);
+ return FindMostEncompassingType (ec, tgt_types_set);
}
/// <summary>
return UserDefinedConversion (ec, source, target, loc, true);
}
- /// <summary>
- /// Computes the MethodGroup for the user-defined conversion
- /// operators from source_type to target_type. `look_for_explicit'
- /// controls whether we should also include the list of explicit
- /// operators
- /// </summary>
- static MethodGroupExpr GetConversionOperators (EmitContext ec,
- Type source_type, Type target_type,
- Location loc, bool look_for_explicit)
+ static void AddConversionOperators (EmitContext ec, ArrayList list,
+ Expression source, Type target_type,
+ bool look_for_explicit,
+ MethodGroupExpr mg)
{
- Expression mg1 = null, mg2 = null;
- Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
- string op_name;
+ if (mg == null)
+ return;
+
+ Type source_type = source.Type;
+ EmptyExpression expr = EmptyExpression.Grab ();
+ foreach (MethodInfo m in mg.Methods) {
+ ParameterData pd = TypeManager.GetParameterData (m);
+ Type return_type = m.ReturnType;
+ Type arg_type = pd.ParameterType (0);
+
+ if (source_type != arg_type) {
+ if (!ImplicitStandardConversionExists (ec, source, arg_type)) {
+ if (!look_for_explicit)
+ continue;
+ expr.SetType (arg_type);
+ if (!ImplicitStandardConversionExists (ec, expr, source_type))
+ continue;
+ }
+ }
- op_name = "op_Implicit";
+ if (target_type != return_type) {
+ expr.SetType (return_type);
+ if (!ImplicitStandardConversionExists (ec, expr, target_type)) {
+ if (!look_for_explicit)
+ continue;
+ expr.SetType (target_type);
+ if (!ImplicitStandardConversionExists (ec, expr, return_type))
+ continue;
+ }
+ }
- MethodGroupExpr union3;
+ list.Add (m);
+ }
- mg1 = Expression.MethodLookup (ec, source_type, op_name, loc);
- if (source_type.BaseType != null)
- mg2 = Expression.MethodLookup (ec, source_type.BaseType, op_name, loc);
+ EmptyExpression.Release (expr);
+ }
- if (mg1 == null)
- union3 = (MethodGroupExpr) mg2;
- else if (mg2 == null)
- union3 = (MethodGroupExpr) mg1;
- else
- union3 = Invocation.MakeUnionSet (mg1, mg2, loc);
+ /// <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 (EmitContext ec, Expression source, Type target_type, bool look_for_explicit)
+ {
+ ArrayList ops = new ArrayList (4);
- mg1 = Expression.MethodLookup (ec, target_type, op_name, loc);
- if (mg1 != null){
- if (union3 != null)
- union3 = Invocation.MakeUnionSet (union3, mg1, loc);
- else
- union3 = (MethodGroupExpr) mg1;
+ Type source_type = source.Type;
+
+ if (source_type != TypeManager.decimal_type) {
+ AddConversionOperators (ec, ops, source, target_type, look_for_explicit,
+ Expression.MethodLookup (ec, source_type, "op_Implicit", Location.Null) as MethodGroupExpr);
+ if (look_for_explicit) {
+ AddConversionOperators (ec, ops, source, target_type, look_for_explicit,
+ Expression.MethodLookup (
+ ec, source_type, "op_Explicit", Location.Null) as MethodGroupExpr);
+ }
}
- if (target_type.BaseType != null)
- mg1 = Expression.MethodLookup (ec, target_type.BaseType, op_name, loc);
-
- if (mg1 != null){
- if (union3 != null)
- union3 = Invocation.MakeUnionSet (union3, mg1, loc);
- else
- union3 = (MethodGroupExpr) mg1;
+ if (target_type != TypeManager.decimal_type) {
+ AddConversionOperators (ec, ops, source, target_type, look_for_explicit,
+ Expression.MethodLookup (ec, target_type, "op_Implicit", Location.Null) as MethodGroupExpr);
+ if (look_for_explicit) {
+ AddConversionOperators (ec, ops, source, target_type, look_for_explicit,
+ Expression.MethodLookup (
+ ec, target_type, "op_Explicit", Location.Null) as MethodGroupExpr);
+ }
}
- MethodGroupExpr union4 = null;
+ if (ops.Count == 0)
+ return null;
- if (look_for_explicit) {
- op_name = "op_Explicit";
+ Type most_specific_source = FindMostSpecificSource (ec, ops, source, look_for_explicit);
+ if (most_specific_source == null)
+ return null;
- mg5 = Expression.MemberLookup (ec, source_type, op_name, loc);
- if (source_type.BaseType != null)
- mg6 = Expression.MethodLookup (ec, source_type.BaseType, op_name, loc);
-
- mg7 = Expression.MemberLookup (ec, target_type, op_name, loc);
- if (target_type.BaseType != null)
- mg8 = Expression.MethodLookup (ec, target_type.BaseType, op_name, loc);
-
- MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6, loc);
- MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8, loc);
+ Type most_specific_target = FindMostSpecificTarget (ec, ops, target_type, look_for_explicit);
+ if (most_specific_target == null)
+ return null;
+
+ MethodInfo method = null;
- union4 = Invocation.MakeUnionSet (union5, union6, loc);
+ foreach (MethodInfo m in ops) {
+ if (m.ReturnType != most_specific_target)
+ continue;
+ if (TypeManager.GetParameterData (m).ParameterType (0) != most_specific_source)
+ continue;
+ // Ambiguous: more than one conversion operator satisfies the signature.
+ if (method != null)
+ return null;
+ method = m;
}
-
- return Invocation.MakeUnionSet (union3, union4, loc);
+
+ return method;
}
-
+
+ static DoubleHash explicit_conv = new DoubleHash (100);
+ static DoubleHash implicit_conv = new DoubleHash (100);
+
/// <summary>
/// User-defined conversions
/// </summary>
Type target, Location loc,
bool look_for_explicit)
{
- MethodGroupExpr union;
Type source_type = source.Type;
- MethodBase method = null;
-
- union = GetConversionOperators (ec, source_type, target, loc, look_for_explicit);
- if (union == null)
- return null;
-
- Type most_specific_source, most_specific_target;
-
- most_specific_source = FindMostSpecificSource (union, source, look_for_explicit, loc);
- if (most_specific_source == null)
- return null;
+ MethodInfo method = null;
- most_specific_target = FindMostSpecificTarget (union, target, look_for_explicit, loc);
- if (most_specific_target == null)
- return null;
+ if (TypeManager.IsNullableType (source_type) && TypeManager.IsNullableType (target))
+ return new Nullable.LiftedConversion (
+ source, target, true, look_for_explicit, loc).Resolve (ec);
- int count = 0;
+ object o;
+ DoubleHash hash = look_for_explicit ? explicit_conv : implicit_conv;
-
- foreach (MethodBase mb in union.Methods){
- ParameterData pd = Invocation.GetParameterData (mb);
- MethodInfo mi = (MethodInfo) mb;
-
- if (pd.ParameterType (0) == most_specific_source &&
- mi.ReturnType == most_specific_target) {
- method = mb;
- count++;
- }
+ if (!(source is Constant) && hash.Lookup (source_type, target, out o)) {
+ method = (MethodInfo) o;
+ } else {
+ method = GetConversionOperator (ec, source, target, look_for_explicit);
+ if (!(source is Constant))
+ hash.Insert (source_type, target, method);
}
-
- if (method == null || count > 1)
+
+ if (method == null)
return null;
-
+ Type most_specific_source = TypeManager.GetParameterData (method).ParameterType (0);
+
//
// This will do the conversion to the best match that we
// found. Now we need to perform an implict standard conversion
return null;
Expression e;
- e = new UserCast ((MethodInfo) method, source, loc);
+ e = new UserCast (method, source, loc);
if (e.Type != target){
if (!look_for_explicit)
e = ImplicitConversionStandard (ec, e, target, loc);
/// in a context that expects a `target_type'.
/// </summary>
static public Expression ImplicitConversion (EmitContext ec, Expression expr,
- Type target_type, Location loc)
+ Type target_type, Location loc)
{
- Type expr_type = expr.Type;
Expression e;
if (target_type == null)
Type expr_type = expr.Type;
Expression e;
- if (expr_type == target_type && !(expr is NullLiteral))
+ if (expr is NullLiteral) {
+ if (target_type.IsGenericParameter)
+ return TypeParameter_to_Null (expr, target_type, loc);
+
+ if (TypeManager.IsNullableType (target_type))
+ return new Nullable.NullableLiteral (target_type, loc);
+ }
+
+ if (TypeManager.IsNullableType (expr_type) && TypeManager.IsNullableType (target_type))
+ return new Nullable.LiftedConversion (
+ expr, target_type, false, false, loc).Resolve (ec);
+
+ if (expr.eclass == ExprClass.MethodGroup){
+ if (!TypeManager.IsDelegateType (target_type)){
+ return null;
+ }
+
+ //
+ // Only allow anonymous method conversions on post ISO_1
+ //
+ if (RootContext.Version != LanguageVersion.ISO_1){
+ MethodGroupExpr mg = expr as MethodGroupExpr;
+ if (mg != null)
+ return ImplicitDelegateCreation.Create (
+ ec, mg, target_type, false, loc);
+ }
+ }
+
+ if (expr_type.Equals (target_type) && !TypeManager.IsNullType (expr_type))
return expr;
- e = ImplicitNumericConversion (ec, expr, target_type, loc);
+ e = ImplicitNumericConversion (ec, expr, target_type);
if (e != null)
return e;
- e = ImplicitReferenceConversion (expr, target_type);
+ e = ImplicitReferenceConversion (ec, expr, target_type);
if (e != null)
return e;
if (target_type.IsPointer){
if (TypeManager.GetElementType(target_type) == TypeManager.GetElementType(expr_type))
return expr;
+
+ //return null;
}
}
- if (target_type.IsPointer) {
- if (expr is NullLiteral)
- return new EmptyCast (expr, target_type);
+ if (expr_type == TypeManager.null_type && target_type.IsPointer)
+ return new EmptyCast (NullPointer.Null, target_type);
+ }
- if (expr_type == TypeManager.void_ptr_type)
- return new EmptyCast (expr, target_type);
+ if (expr_type == TypeManager.anonymous_method_type){
+ if (!TypeManager.IsDelegateType (target_type)){
+ Report.Error (1660, loc,
+ "Cannot convert anonymous method block to type `{0}' because it is not a delegate type",
+ TypeManager.CSharpName (target_type));
+ return null;
}
- }
+ AnonymousMethod am = (AnonymousMethod) expr;
+ int errors = Report.Errors;
+
+ Expression conv = am.Compatible (ec, target_type, false);
+ if (conv != null)
+ return conv;
+
+ //
+ // We return something instead of null, to avoid
+ // the duplicate error, since am.Compatible would have
+ // reported that already
+ //
+ if (errors != Report.Errors)
+ return new EmptyCast (expr, target_type);
+ }
+
return null;
}
/// <summary>
- /// Attemps to perform an implict constant conversion of the IntConstant
+ /// Attempts to perform an implicit constant conversion of the IntConstant
/// into a different data type using casts (See Implicit Constant
/// Expression Conversions)
/// </summary>
if (target_type == TypeManager.sbyte_type){
if (value >= SByte.MinValue && value <= SByte.MaxValue)
- return new SByteConstant ((sbyte) value);
+ return new SByteConstant ((sbyte) value, ic.Location);
} else if (target_type == TypeManager.byte_type){
- if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
- return new ByteConstant ((byte) value);
+ if (value >= Byte.MinValue && value <= Byte.MaxValue)
+ return new ByteConstant ((byte) value, ic.Location);
} else if (target_type == TypeManager.short_type){
if (value >= Int16.MinValue && value <= Int16.MaxValue)
- return new ShortConstant ((short) value);
+ return new ShortConstant ((short) value, ic.Location);
} else if (target_type == TypeManager.ushort_type){
if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
- return new UShortConstant ((ushort) value);
+ return new UShortConstant ((ushort) value, ic.Location);
} else if (target_type == TypeManager.uint32_type){
if (value >= 0)
- return new UIntConstant ((uint) value);
+ return new UIntConstant ((uint) value, ic.Location);
} else if (target_type == TypeManager.uint64_type){
//
// we can optimize this case: a positive int32
// to do it.
//
if (value >= 0)
- return new ULongConstant ((ulong) value);
+ return new ULongConstant ((ulong) value, ic.Location);
} else if (target_type == TypeManager.double_type)
- return new DoubleConstant ((double) value);
+ return new DoubleConstant ((double) value, ic.Location);
else if (target_type == TypeManager.float_type)
- return new FloatConstant ((float) value);
+ return new FloatConstant ((float) value, ic.Location);
if (value == 0 && ic is IntLiteral && TypeManager.IsEnumType (target_type)){
Type underlying = TypeManager.EnumToUnderlying (target_type);
//
// Possibly, we need to create a different 0 literal before passing
// to EnumConstant
- //n
+ //
if (underlying == TypeManager.int64_type)
- e = new LongLiteral (0);
+ e = new LongLiteral (0, ic.Location);
else if (underlying == TypeManager.uint64_type)
- e = new ULongLiteral (0);
+ e = new ULongLiteral (0, ic.Location);
return new EnumConstant (e, target_type);
}
- return null;
- }
- static public void Error_CannotImplicitConversion (Location loc, Type source, Type target)
- {
- string msg = "Cannot convert implicitly from `"+
- TypeManager.CSharpName (source) + "' to `" +
- TypeManager.CSharpName (target) + "'";
+ //
+ // If `target_type' is an interface and the type of `ic' implements the interface
+ // e.g. target_type is IComparable, IConvertible, IFormattable
+ //
+ if (target_type.IsInterface && target_type.IsAssignableFrom (ic.Type))
+ return new BoxedCast (ic, target_type);
- Report.Error (29, loc, msg);
+ return null;
}
/// <summary>
- /// Attemptes to implicityly convert `target' into `type', using
+ /// Attempts to implicitly convert `source' into `target_type', using
/// ImplicitConversion. If there is no implicit conversion, then
/// an error is signaled
/// </summary>
Type target_type, Location loc)
{
Expression e;
-
+
+ int errors = Report.Errors;
e = ImplicitConversion (ec, source, target_type, loc);
+ if (Report.Errors > errors)
+ return null;
if (e != null)
return e;
- if (source is DoubleLiteral && target_type == TypeManager.float_type){
- Report.Error (664, loc,
- "Double literal cannot be implicitly converted to " +
- "float type, use F suffix to create a float literal");
+ if (source is DoubleLiteral) {
+ if (target_type == TypeManager.float_type) {
+ Error_664 (loc, "float", "f");
+ return null;
+ }
+ if (target_type == TypeManager.decimal_type) {
+ Error_664 (loc, "decimal", "m");
+ return null;
+ }
}
- Error_CannotImplicitConversion (loc, source.Type, target_type);
-
+ source.Error_ValueCannotBeConverted (loc, target_type, false);
return null;
}
+ static void Error_664 (Location loc, string type, string suffix) {
+ Report.Error (664, loc,
+ "Literal of type double cannot be implicitly converted to type `{0}'. Add suffix `{1}' to create a literal of this type",
+ type, suffix);
+ }
+
/// <summary>
/// Performs the explicit numeric conversions
/// </summary>
- static Expression ExplicitNumericConversion (EmitContext ec, Expression expr, Type target_type, Location loc)
+ public static Expression ExplicitNumericConversion (Expression expr, Type target_type)
{
Type expr_type = expr.Type;
-
- //
- // If we have an enumeration, extract the underlying type,
- // use this during the comparison, but wrap around the original
- // target_type
- //
Type real_target_type = target_type;
- if (TypeManager.IsEnumType (real_target_type))
- real_target_type = TypeManager.EnumToUnderlying (real_target_type);
-
- if (ImplicitStandardConversionExists (expr, real_target_type)){
- Expression ce = ImplicitConversionStandard (ec, expr, real_target_type, loc);
-
- if (real_target_type != target_type)
- return new EmptyCast (ce, target_type);
- return ce;
- }
-
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to byte, ushort, uint, ulong, char
//
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_U1);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_U2);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_U4);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I1_CH);
} else if (expr_type == TypeManager.byte_type){
//
// From byte to sbyte and char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U1_I1);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U1_CH);
} else if (expr_type == TypeManager.short_type){
//
// From short to sbyte, byte, ushort, uint, ulong, char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_U1);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_U2);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_U4);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I2_CH);
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to sbyte, byte, short, char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U2_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U2_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U2_I2);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U2_CH);
} else if (expr_type == TypeManager.int32_type){
//
// From int to sbyte, byte, short, ushort, uint, ulong, char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_U2);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_U4);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I4_CH);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to sbyte, byte, short, ushort, int, char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_I4);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U4_CH);
} else if (expr_type == TypeManager.int64_type){
//
// From long to sbyte, byte, short, ushort, int, uint, ulong, char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_I4);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_U4);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_CH);
} else if (expr_type == TypeManager.uint64_type){
//
// From ulong to sbyte, byte, short, ushort, int, uint, long, char
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I4);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_U4);
if (real_target_type == TypeManager.int64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_CH);
} else if (expr_type == TypeManager.char_type){
//
// From char to sbyte, byte, short
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.CH_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.CH_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.CH_I2);
} else if (expr_type == TypeManager.float_type){
//
// From float to sbyte, byte, short,
// or decimal
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_I4);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_U4);
if (real_target_type == TypeManager.int64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_I8);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R4_CH);
+ if (real_target_type == TypeManager.decimal_type)
+ return new CastToDecimal (expr, true);
} else if (expr_type == TypeManager.double_type){
//
- // From double to byte, byte, short,
+ // From double to sbyte, byte, short,
// ushort, int, uint, long, ulong,
// char, float or decimal
//
if (real_target_type == TypeManager.sbyte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_I1);
if (real_target_type == TypeManager.byte_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U1);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_U1);
if (real_target_type == TypeManager.short_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_I2);
if (real_target_type == TypeManager.ushort_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U2);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_U2);
if (real_target_type == TypeManager.int32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_I4);
if (real_target_type == TypeManager.uint32_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U4);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_U4);
if (real_target_type == TypeManager.int64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_I8);
if (real_target_type == TypeManager.uint64_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U8);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_U8);
if (real_target_type == TypeManager.char_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_CH);
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_CH);
if (real_target_type == TypeManager.float_type)
- return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_R4);
- }
-
- // decimal is taken care of by the op_Explicit methods.
-
+ return new ConvCast (expr, target_type, ConvCast.Mode.R8_R4);
+ if (real_target_type == TypeManager.decimal_type)
+ return new CastToDecimal (expr, true);
+ } else if (expr_type == TypeManager.decimal_type) {
+ return new CastFromDecimal (expr, target_type).Resolve ();
+ }
return null;
}
/// </summary>
public static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
{
+ bool target_is_type_param = target_type.IsGenericParameter;
bool target_is_value_type = target_type.IsValueType;
if (source_type == target_type)
return true;
+ //
+ // From generic parameter to any type
+ //
+ if (source_type.IsGenericParameter)
+ return true;
+
+ //
+ // From object to a generic parameter
+ //
+ if (source_type == TypeManager.object_type && target_is_type_param)
+ return true;
+
//
// From object to any reference type
//
//
// From any class S to any class-type T, provided S is a base class of T
//
- if (target_type.IsSubclassOf (source_type))
+ if (TypeManager.IsSubclassOf (target_type, source_type))
return true;
//
// From any interface type S to any interface T provided S is not derived from T
//
if (source_type.IsInterface && target_type.IsInterface){
- if (!target_type.IsSubclassOf (source_type))
+ if (!TypeManager.IsSubclassOf (target_type, source_type))
return true;
}
Type source_element_type = TypeManager.GetElementType (source_type);
Type target_element_type = TypeManager.GetElementType (target_type);
-
- if (!source_element_type.IsValueType && !target_element_type.IsValueType)
+
+ if (source_element_type.IsGenericParameter ||
+ (!source_element_type.IsValueType && !target_element_type.IsValueType))
if (ExplicitReferenceConversionExists (source_element_type,
target_element_type))
return true;
// From System delegate to any delegate-type
//
if (source_type == TypeManager.delegate_type &&
- target_type.IsSubclassOf (TypeManager.delegate_type))
+ TypeManager.IsDelegateType (target_type))
return true;
//
static Expression ExplicitReferenceConversion (Expression source, Type target_type)
{
Type source_type = source.Type;
+ bool target_is_type_param = target_type.IsGenericParameter;
bool target_is_value_type = target_type.IsValueType;
+ //
+ // From object to a generic parameter
+ //
+ if (source_type == TypeManager.object_type && target_is_type_param)
+ return new UnboxCast (source, target_type);
+
//
// From object to any reference type
//
if (source_type == TypeManager.object_type && !target_is_value_type)
return new ClassCast (source, target_type);
+ //
+ // Unboxing conversion.
+ //
+ if (((source_type == TypeManager.enum_type &&
+ !(source is EmptyCast)) ||
+ source_type == TypeManager.value_type) && target_is_value_type)
+ return new UnboxCast (source, target_type);
//
// From any class S to any class-type T, provided S is a base class of T
//
- if (target_type.IsSubclassOf (source_type))
+ if (TypeManager.IsSubclassOf (target_type, source_type))
return new ClassCast (source, target_type);
//
else
return new ClassCast (source, target_type);
}
-
+
//
// From any class type S to any interface T, provides S is not sealed
// and provided S does not implement T.
// From System delegate to any delegate-type
//
if (source_type == TypeManager.delegate_type &&
- target_type.IsSubclassOf (TypeManager.delegate_type))
+ TypeManager.IsDelegateType (target_type))
return new ClassCast (source, target_type);
//
/// Performs an explicit conversion of the expression `expr' whose
/// type is expr.Type to `target_type'.
/// </summary>
- static public Expression ExplicitConversion (EmitContext ec, Expression expr,
- Type target_type, Location loc)
+ static public Expression ExplicitConversionCore (EmitContext ec, Expression expr,
+ Type target_type, Location loc)
{
Type expr_type = expr.Type;
- Type original_expr_type = expr_type;
-
- if (expr_type.IsSubclassOf (TypeManager.enum_type)){
- if (target_type == TypeManager.enum_type ||
- target_type == TypeManager.object_type) {
- if (expr is EnumConstant)
- expr = ((EnumConstant) expr).Child;
- // We really need all these casts here .... :-(
- expr = new BoxedCast (new EmptyCast (expr, expr_type));
- return new EmptyCast (expr, target_type);
- } else if ((expr_type == TypeManager.enum_type) && target_type.IsValueType &&
- target_type.IsSubclassOf (TypeManager.enum_type))
- return new UnboxCast (expr, target_type);
-
- //
- // Notice that we have kept the expr_type unmodified, which is only
- // used later on to
- if (expr is EnumConstant)
- expr = ((EnumConstant) expr).Child;
- else
- expr = new EmptyCast (expr, TypeManager.EnumToUnderlying (expr_type));
- expr_type = expr.Type;
- }
+ // Explicit conversion includes implicit conversion and it used for enum underlying types too
Expression ne = ImplicitConversionStandard (ec, expr, target_type, loc);
-
- if (ne != null)
- return ne;
-
- ne = ExplicitNumericConversion (ec, expr, target_type, loc);
if (ne != null)
return ne;
//
- // Unboxing conversion.
+ // Unboxing conversions; only object types can be convertible to enum
//
- if (expr_type == TypeManager.object_type && target_type.IsValueType){
- if (expr is NullLiteral){
- Report.Error (37, "Cannot convert null to value type `" +
- TypeManager.CSharpName (expr_type) + "'");
- return null;
- }
+ if (expr_type == TypeManager.object_type && target_type.IsValueType || expr_type == TypeManager.enum_type)
return new UnboxCast (expr, target_type);
+
+ if (TypeManager.IsEnumType (expr_type)) {
+ if (expr is EnumConstant)
+ return ExplicitConversionCore (ec, ((EnumConstant) expr).Child, target_type, loc);
+
+ return ExplicitConversionCore (ec, new EmptyCast (expr, TypeManager.EnumToUnderlying (expr_type)), target_type, loc);
}
-
- ne = ExplicitReferenceConversion (expr, target_type);
+ if (TypeManager.IsNullableType (expr_type) && TypeManager.IsNullableType (target_type))
+ return new Nullable.LiftedConversion (
+ expr, target_type, false, true, loc).Resolve (ec);
+
+ if (TypeManager.IsEnumType (target_type))
+ return new EmptyCast (ExplicitConversionCore (ec, expr, TypeManager.EnumToUnderlying (target_type), loc), target_type);
+
+ 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){
+ ne = ExplicitReferenceConversion (expr, target_type);
+ if (ne != null)
+ return ne;
+ }
+
if (ec.InUnsafe){
- if (target_type.IsPointer){
- if (expr_type.IsPointer)
- return new EmptyCast (expr, target_type);
-
- if (expr_type == TypeManager.sbyte_type ||
- expr_type == TypeManager.byte_type ||
- expr_type == TypeManager.short_type ||
- expr_type == TypeManager.ushort_type ||
- expr_type == TypeManager.int32_type ||
- expr_type == TypeManager.uint32_type ||
- expr_type == TypeManager.uint64_type ||
- expr_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
- }
- if (expr_type.IsPointer){
- Expression e = null;
-
- if (target_type == TypeManager.sbyte_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- else if (target_type == TypeManager.byte_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- else if (target_type == TypeManager.short_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- else if (target_type == TypeManager.ushort_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- else if (target_type == TypeManager.int32_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- else if (target_type == TypeManager.uint32_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- else if (target_type == TypeManager.uint64_type)
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- else if (target_type == TypeManager.int64_type){
- e = new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- }
+ ne = ExplicitUnsafe (expr, target_type);
+ if (ne != null)
+ return ne;
+ }
- if (e != null){
- Expression ci, ce;
+ ne = ExplicitUserConversion (ec, expr, target_type, loc);
+ if (ne != null)
+ return ne;
- ci = ImplicitConversionStandard (ec, e, target_type, loc);
+ return null;
+ }
- if (ci != null)
- return ci;
+ public static Expression ExplicitUnsafe (Expression expr, Type target_type)
+ {
+ Type expr_type = expr.Type;
- ce = ExplicitNumericConversion (ec, e, target_type, loc);
- if (ce != null)
- return ce;
- //
- // We should always be able to go from an uint32
- // implicitly or explicitly to the other integral
- // types
- //
- throw new Exception ("Internal compiler error");
- }
- }
+ if (target_type.IsPointer){
+ if (expr_type.IsPointer)
+ return new EmptyCast (expr, target_type);
+
+ if (expr_type == TypeManager.sbyte_type ||
+ expr_type == TypeManager.short_type ||
+ expr_type == TypeManager.int32_type ||
+ expr_type == TypeManager.int64_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_I);
+
+ if (expr_type == TypeManager.ushort_type ||
+ expr_type == TypeManager.uint32_type ||
+ expr_type == TypeManager.uint64_type ||
+ expr_type == TypeManager.byte_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
}
- ne = ExplicitUserConversion (ec, expr, target_type, loc);
- if (ne != null)
- return ne;
-
- Error_CannotConvertType (loc, original_expr_type, target_type);
+ if (expr_type.IsPointer){
+ if (target_type == TypeManager.sbyte_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
+ else if (target_type == TypeManager.byte_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
+ else if (target_type == TypeManager.short_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
+ else if (target_type == TypeManager.ushort_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ else if (target_type == TypeManager.int32_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
+ else if (target_type == TypeManager.uint32_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
+ else if (target_type == TypeManager.uint64_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
+ else if (target_type == TypeManager.int64_type){
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
+ }
+ }
return null;
}
/// Same as ExplicitConversion, only it doesn't include user defined conversions
/// </summary>
static public Expression ExplicitConversionStandard (EmitContext ec, Expression expr,
- Type target_type, Location l)
+ Type target_type, Location l)
{
+ int errors = Report.Errors;
Expression ne = ImplicitConversionStandard (ec, expr, target_type, l);
+ if (Report.Errors > errors)
+ return null;
if (ne != null)
return ne;
- ne = ExplicitNumericConversion (ec, expr, target_type, l);
+ if (TypeManager.IsNullableType (expr.Type) && TypeManager.IsNullableType (target_type))
+ return new Nullable.LiftedConversion (
+ expr, target_type, false, true, l).Resolve (ec);
+
+ ne = ExplicitNumericConversion (expr, target_type);
if (ne != null)
return ne;
if (ne != null)
return ne;
- Error_CannotConvertType (l, expr.Type, target_type);
+ if (ec.InUnsafe && expr.Type == TypeManager.void_ptr_type && target_type.IsPointer)
+ return new EmptyCast (expr, target_type);
+
+ expr.Error_ValueCannotBeConverted (l, target_type, true);
+ return null;
+ }
+
+ /// <summary>
+ /// Performs an explicit conversion of the expression `expr' whose
+ /// type is expr.Type to `target_type'.
+ /// </summary>
+ static public Expression ExplicitConversion (EmitContext ec, Expression expr,
+ Type target_type, Location loc)
+ {
+ Expression e = ExplicitConversionCore (ec, expr, target_type, loc);
+ if (e != null)
+ return e;
+
+ expr.Error_ValueCannotBeConverted (loc, target_type, true);
return null;
}
}
projects / mono.git / blobdiff