2 // ecore.cs: Core of the Expression representation for the intermediate tree.
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001 Ximian, Inc.
11 namespace Mono.CSharp {
13 using System.Collections;
14 using System.Diagnostics;
15 using System.Reflection;
16 using System.Reflection.Emit;
20 /// The ExprClass class contains the is used to pass the
21 /// classification of an expression (value, variable, namespace,
22 /// type, method group, property access, event access, indexer access,
25 public enum ExprClass : byte {
40 /// This is used to tell Resolve in which types of expressions we're
44 public enum ResolveFlags {
45 // Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
48 // Returns a type expression.
51 // Returns a method group.
54 // Allows SimpleNames to be returned.
55 // This is used by MemberAccess to construct long names that can not be
56 // partially resolved (namespace-qualified names for example).
59 // Mask of all the expression class flags.
62 // Disable control flow analysis while resolving the expression.
63 // This is used when resolving the instance expression of a field expression.
64 DisableFlowAnalysis = 16
68 // This is just as a hint to AddressOf of what will be done with the
71 public enum AddressOp {
78 /// This interface is implemented by variables
80 public interface IMemoryLocation {
82 /// The AddressOf method should generate code that loads
83 /// the address of the object and leaves it on the stack.
85 /// The `mode' argument is used to notify the expression
86 /// of whether this will be used to read from the address or
87 /// write to the address.
89 /// This is just a hint that can be used to provide good error
90 /// reporting, and should have no other side effects.
92 void AddressOf (EmitContext ec, AddressOp mode);
96 /// This interface is implemented by variables
98 public interface IVariable {
100 /// Checks whether the variable has already been assigned at
101 /// the current position of the method's control flow and
102 /// reports an appropriate error message if not.
104 /// If the variable is a struct, then this call checks whether
105 /// all of its fields (including all private ones) have been
108 bool IsAssigned (EmitContext ec, Location loc);
111 /// Checks whether field `name' in this struct has been assigned.
113 bool IsFieldAssigned (EmitContext ec, string name, Location loc);
116 /// Tells the flow analysis code that the variable has already
117 /// been assigned at the current code position.
119 /// If the variable is a struct, this call marks all its fields
120 /// (including private fields) as being assigned.
122 void SetAssigned (EmitContext ec);
125 /// Tells the flow analysis code that field `name' in this struct
126 /// has already been assigned atthe current code position.
128 void SetFieldAssigned (EmitContext ec, string name);
132 /// This interface denotes an expression which evaluates to a member
133 /// of a struct or a class.
135 public interface IMemberExpr
138 /// The name of this member.
145 /// Whether this is an instance member.
152 /// Whether this is a static member.
159 /// The type which declares this member.
166 /// The instance expression associated with this member, if it's a
167 /// non-static member.
169 Expression InstanceExpression {
175 /// Expression which resolves to a type.
177 public interface ITypeExpression
180 /// Resolve the expression, but only lookup types.
182 Expression DoResolveType (EmitContext ec);
186 /// Base class for expressions
188 public abstract class Expression {
189 public ExprClass eclass;
191 protected Location loc;
203 public Location Location {
210 /// Utility wrapper routine for Error, just to beautify the code
212 public void Error (int error, string s)
214 if (!Location.IsNull (loc))
215 Report.Error (error, loc, s);
217 Report.Error (error, s);
221 /// Utility wrapper routine for Warning, just to beautify the code
223 public void Warning (int warning, string s)
225 if (!Location.IsNull (loc))
226 Report.Warning (warning, loc, s);
228 Report.Warning (warning, s);
232 /// Utility wrapper routine for Warning, only prints the warning if
233 /// warnings of level `level' are enabled.
235 public void Warning (int warning, int level, string s)
237 if (level <= RootContext.WarningLevel)
238 Warning (warning, s);
241 static public void Error_CannotConvertType (Location loc, Type source, Type target)
243 Report.Error (30, loc, "Cannot convert type '" +
244 TypeManager.CSharpName (source) + "' to '" +
245 TypeManager.CSharpName (target) + "'");
249 /// Performs semantic analysis on the Expression
253 /// The Resolve method is invoked to perform the semantic analysis
256 /// The return value is an expression (it can be the
257 /// same expression in some cases) or a new
258 /// expression that better represents this node.
260 /// For example, optimizations of Unary (LiteralInt)
261 /// would return a new LiteralInt with a negated
264 /// If there is an error during semantic analysis,
265 /// then an error should be reported (using Report)
266 /// and a null value should be returned.
268 /// There are two side effects expected from calling
269 /// Resolve(): the the field variable "eclass" should
270 /// be set to any value of the enumeration
271 /// `ExprClass' and the type variable should be set
272 /// to a valid type (this is the type of the
275 public abstract Expression DoResolve (EmitContext ec);
277 public virtual Expression DoResolveLValue (EmitContext ec, Expression right_side)
279 return DoResolve (ec);
283 /// Resolves an expression and performs semantic analysis on it.
287 /// Currently Resolve wraps DoResolve to perform sanity
288 /// checking and assertion checking on what we expect from Resolve.
290 public Expression Resolve (EmitContext ec, ResolveFlags flags)
292 // Are we doing a types-only search ?
293 if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type) {
294 ITypeExpression type_expr = this as ITypeExpression;
296 if (type_expr == null)
299 return type_expr.DoResolveType (ec);
302 bool old_do_flow_analysis = ec.DoFlowAnalysis;
303 if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
304 ec.DoFlowAnalysis = false;
307 if (this is SimpleName)
308 e = ((SimpleName) this).DoResolveAllowStatic (ec);
312 ec.DoFlowAnalysis = old_do_flow_analysis;
317 if (e is SimpleName){
318 SimpleName s = (SimpleName) e;
320 if ((flags & ResolveFlags.SimpleName) == 0) {
322 object lookup = TypeManager.MemberLookup (
323 ec.ContainerType, ec.ContainerType, AllMemberTypes,
324 AllBindingFlags | BindingFlags.NonPublic, s.Name);
326 Error (122, "`" + s.Name + "' " +
327 "is inaccessible because of its protection level");
329 Error (103, "The name `" + s.Name + "' could not be " +
330 "found in `" + ec.DeclSpace.Name + "'");
337 if ((e is TypeExpr) || (e is ComposedCast)) {
338 if ((flags & ResolveFlags.Type) == 0) {
348 if ((flags & ResolveFlags.VariableOrValue) == 0) {
354 case ExprClass.MethodGroup:
355 if ((flags & ResolveFlags.MethodGroup) == 0) {
356 ((MethodGroupExpr) e).ReportUsageError ();
361 case ExprClass.Value:
362 case ExprClass.Variable:
363 case ExprClass.PropertyAccess:
364 case ExprClass.EventAccess:
365 case ExprClass.IndexerAccess:
366 if ((flags & ResolveFlags.VariableOrValue) == 0) {
373 throw new Exception ("Expression " + e.GetType () +
374 " ExprClass is Invalid after resolve");
378 throw new Exception (
379 "Expression " + e.GetType () +
380 " did not set its type after Resolve\n" +
381 "called from: " + this.GetType ());
387 /// Resolves an expression and performs semantic analysis on it.
389 public Expression Resolve (EmitContext ec)
391 return Resolve (ec, ResolveFlags.VariableOrValue);
395 /// Resolves an expression for LValue assignment
399 /// Currently ResolveLValue wraps DoResolveLValue to perform sanity
400 /// checking and assertion checking on what we expect from Resolve
402 public Expression ResolveLValue (EmitContext ec, Expression right_side)
404 Expression e = DoResolveLValue (ec, right_side);
407 if (e is SimpleName){
408 SimpleName s = (SimpleName) e;
412 "The name `" + s.Name + "' could not be found in `" +
413 ec.DeclSpace.Name + "'");
417 if (e.eclass == ExprClass.Invalid)
418 throw new Exception ("Expression " + e +
419 " ExprClass is Invalid after resolve");
421 if (e.eclass == ExprClass.MethodGroup) {
422 ((MethodGroupExpr) e).ReportUsageError ();
427 throw new Exception ("Expression " + e +
428 " did not set its type after Resolve");
435 /// Emits the code for the expression
439 /// The Emit method is invoked to generate the code
440 /// for the expression.
442 public abstract void Emit (EmitContext ec);
445 /// Protected constructor. Only derivate types should
446 /// be able to be created
449 protected Expression ()
451 eclass = ExprClass.Invalid;
456 /// Returns a literalized version of a literal FieldInfo
460 /// The possible return values are:
461 /// IntConstant, UIntConstant
462 /// LongLiteral, ULongConstant
463 /// FloatConstant, DoubleConstant
466 /// The value returned is already resolved.
468 public static Constant Constantify (object v, Type t)
470 if (t == TypeManager.int32_type)
471 return new IntConstant ((int) v);
472 else if (t == TypeManager.uint32_type)
473 return new UIntConstant ((uint) v);
474 else if (t == TypeManager.int64_type)
475 return new LongConstant ((long) v);
476 else if (t == TypeManager.uint64_type)
477 return new ULongConstant ((ulong) v);
478 else if (t == TypeManager.float_type)
479 return new FloatConstant ((float) v);
480 else if (t == TypeManager.double_type)
481 return new DoubleConstant ((double) v);
482 else if (t == TypeManager.string_type)
483 return new StringConstant ((string) v);
484 else if (t == TypeManager.short_type)
485 return new ShortConstant ((short)v);
486 else if (t == TypeManager.ushort_type)
487 return new UShortConstant ((ushort)v);
488 else if (t == TypeManager.sbyte_type)
489 return new SByteConstant (((sbyte)v));
490 else if (t == TypeManager.byte_type)
491 return new ByteConstant ((byte)v);
492 else if (t == TypeManager.char_type)
493 return new CharConstant ((char)v);
494 else if (t == TypeManager.bool_type)
495 return new BoolConstant ((bool) v);
496 else if (TypeManager.IsEnumType (t)){
497 Constant e = Constantify (v, TypeManager.TypeToCoreType (v.GetType ()));
499 return new EnumConstant (e, t);
501 throw new Exception ("Unknown type for constant (" + t +
506 /// Returns a fully formed expression after a MemberLookup
508 public static Expression ExprClassFromMemberInfo (EmitContext ec, MemberInfo mi, Location loc)
511 return new EventExpr ((EventInfo) mi, loc);
512 else if (mi is FieldInfo)
513 return new FieldExpr ((FieldInfo) mi, loc);
514 else if (mi is PropertyInfo)
515 return new PropertyExpr (ec, (PropertyInfo) mi, loc);
516 else if (mi is Type){
517 return new TypeExpr ((System.Type) mi, loc);
524 // FIXME: Probably implement a cache for (t,name,current_access_set)?
526 // This code could use some optimizations, but we need to do some
527 // measurements. For example, we could use a delegate to `flag' when
528 // something can not any longer be a method-group (because it is something
532 // If the return value is an Array, then it is an array of
535 // If the return value is an MemberInfo, it is anything, but a Method
539 // FIXME: When calling MemberLookup inside an `Invocation', we should pass
540 // the arguments here and have MemberLookup return only the methods that
541 // match the argument count/type, unlike we are doing now (we delay this
544 // This is so we can catch correctly attempts to invoke instance methods
545 // from a static body (scan for error 120 in ResolveSimpleName).
548 // FIXME: Potential optimization, have a static ArrayList
551 public static Expression MemberLookup (EmitContext ec, Type t, string name,
552 MemberTypes mt, BindingFlags bf, Location loc)
554 return MemberLookup (ec, ec.ContainerType, t, name, mt, bf, loc);
558 // Lookup type `t' for code in class `invocation_type'. Note that it's important
559 // to set `invocation_type' correctly since this method also checks whether the
560 // invoking class is allowed to access the member in class `t'. When you want to
561 // explicitly do a lookup in the base class, you must set both `t' and `invocation_type'
562 // to the base class (although a derived class can access protected members of its base
563 // class it cannot do so through an instance of the base class (error CS1540)).
566 public static Expression MemberLookup (EmitContext ec, Type invocation_type, Type t,
567 string name, MemberTypes mt, BindingFlags bf,
570 MemberInfo [] mi = TypeManager.MemberLookup (invocation_type, t, mt, bf, name);
575 int count = mi.Length;
578 return new MethodGroupExpr (mi, loc);
580 if (mi [0] is MethodBase)
581 return new MethodGroupExpr (mi, loc);
583 return ExprClassFromMemberInfo (ec, mi [0], loc);
586 public const MemberTypes AllMemberTypes =
587 MemberTypes.Constructor |
591 MemberTypes.NestedType |
592 MemberTypes.Property;
594 public const BindingFlags AllBindingFlags =
595 BindingFlags.Public |
596 BindingFlags.Static |
597 BindingFlags.Instance;
599 public static Expression MemberLookup (EmitContext ec, Type t, string name, Location loc)
601 return MemberLookup (ec, ec.ContainerType, t, name,
602 AllMemberTypes, AllBindingFlags, loc);
605 public static Expression MethodLookup (EmitContext ec, Type t, string name, Location loc)
607 return MemberLookup (ec, ec.ContainerType, t, name,
608 MemberTypes.Method, AllBindingFlags, loc);
612 /// This is a wrapper for MemberLookup that is not used to "probe", but
613 /// to find a final definition. If the final definition is not found, we
614 /// look for private members and display a useful debugging message if we
617 public static Expression MemberLookupFinal (EmitContext ec, Type t, string name,
620 return MemberLookupFinal (ec, t, name, MemberTypes.Method, AllBindingFlags, loc);
623 public static Expression MemberLookupFinal (EmitContext ec, Type t, string name,
624 MemberTypes mt, BindingFlags bf, Location loc)
628 int errors = Report.Errors;
630 e = MemberLookup (ec, ec.ContainerType, t, name, mt, bf, loc);
635 // Error has already been reported.
636 if (errors < Report.Errors)
639 e = MemberLookup (ec, t, name, AllMemberTypes,
640 AllBindingFlags | BindingFlags.NonPublic, loc);
643 117, loc, "`" + t + "' does not contain a definition " +
644 "for `" + name + "'");
647 122, loc, "`" + t + "." + name +
648 "' is inaccessible due to its protection level");
654 static public MemberInfo GetFieldFromEvent (EventExpr event_expr)
656 EventInfo ei = event_expr.EventInfo;
658 return TypeManager.GetPrivateFieldOfEvent (ei);
661 static EmptyExpression MyEmptyExpr;
662 static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
664 Type expr_type = expr.Type;
666 if (expr_type == null && expr.eclass == ExprClass.MethodGroup){
667 // if we are a method group, emit a warning
673 // notice that it is possible to write "ValueType v = 1", the ValueType here
674 // is an abstract class, and not really a value type, so we apply the same rules.
676 if (target_type == TypeManager.object_type || target_type == TypeManager.value_type) {
678 // A pointer type cannot be converted to object
680 if (expr_type.IsPointer)
683 if (expr_type.IsValueType)
684 return new BoxedCast (expr);
685 if (expr_type.IsClass || expr_type.IsInterface)
686 return new EmptyCast (expr, target_type);
687 } else if (expr_type.IsSubclassOf (target_type)) {
689 // Special case: enumeration to System.Enum.
690 // System.Enum is not a value type, it is a class, so we need
691 // a boxing conversion
693 if (expr_type.IsEnum)
694 return new BoxedCast (expr);
696 return new EmptyCast (expr, target_type);
699 // This code is kind of mirrored inside StandardConversionExists
700 // with the small distinction that we only probe there
702 // Always ensure that the code here and there is in sync
704 // from the null type to any reference-type.
705 if (expr is NullLiteral && !target_type.IsValueType)
706 return new EmptyCast (expr, target_type);
708 // from any class-type S to any interface-type T.
709 if (target_type.IsInterface) {
710 if (TypeManager.ImplementsInterface (expr_type, target_type)){
711 if (expr_type.IsClass)
712 return new EmptyCast (expr, target_type);
713 else if (expr_type.IsValueType)
714 return new BoxedCast (expr);
718 // from any interface type S to interface-type T.
719 if (expr_type.IsInterface && target_type.IsInterface) {
720 if (TypeManager.ImplementsInterface (expr_type, target_type))
721 return new EmptyCast (expr, target_type);
726 // from an array-type S to an array-type of type T
727 if (expr_type.IsArray && target_type.IsArray) {
728 if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
730 Type expr_element_type = expr_type.GetElementType ();
732 if (MyEmptyExpr == null)
733 MyEmptyExpr = new EmptyExpression ();
735 MyEmptyExpr.SetType (expr_element_type);
736 Type target_element_type = target_type.GetElementType ();
738 if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
739 if (StandardConversionExists (MyEmptyExpr,
740 target_element_type))
741 return new EmptyCast (expr, target_type);
746 // from an array-type to System.Array
747 if (expr_type.IsArray && target_type == TypeManager.array_type)
748 return new EmptyCast (expr, target_type);
750 // from any delegate type to System.Delegate
751 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
752 target_type == TypeManager.delegate_type)
753 return new EmptyCast (expr, target_type);
755 // from any array-type or delegate type into System.ICloneable.
756 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
757 if (target_type == TypeManager.icloneable_type)
758 return new EmptyCast (expr, target_type);
768 /// Implicit Numeric Conversions.
770 /// expr is the expression to convert, returns a new expression of type
771 /// target_type or null if an implicit conversion is not possible.
773 static public Expression ImplicitNumericConversion (EmitContext ec, Expression expr,
774 Type target_type, Location loc)
776 Type expr_type = expr.Type;
779 // Attempt to do the implicit constant expression conversions
781 if (expr is IntConstant){
784 e = TryImplicitIntConversion (target_type, (IntConstant) expr);
788 } else if (expr is LongConstant && target_type == TypeManager.uint64_type){
790 // Try the implicit constant expression conversion
791 // from long to ulong, instead of a nice routine,
794 long v = ((LongConstant) expr).Value;
796 return new ULongConstant ((ulong) v);
799 Type real_target_type = target_type;
801 if (expr_type == TypeManager.sbyte_type){
803 // From sbyte to short, int, long, float, double.
805 if (real_target_type == TypeManager.int32_type)
806 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
807 if (real_target_type == TypeManager.int64_type)
808 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
809 if (real_target_type == TypeManager.double_type)
810 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
811 if (real_target_type == TypeManager.float_type)
812 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
813 if (real_target_type == TypeManager.short_type)
814 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
815 } else if (expr_type == TypeManager.byte_type){
817 // From byte to short, ushort, int, uint, long, ulong, float, double
819 if ((real_target_type == TypeManager.short_type) ||
820 (real_target_type == TypeManager.ushort_type) ||
821 (real_target_type == TypeManager.int32_type) ||
822 (real_target_type == TypeManager.uint32_type))
823 return new EmptyCast (expr, target_type);
825 if (real_target_type == TypeManager.uint64_type)
826 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
827 if (real_target_type == TypeManager.int64_type)
828 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
829 if (real_target_type == TypeManager.float_type)
830 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
831 if (real_target_type == TypeManager.double_type)
832 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
833 } else if (expr_type == TypeManager.short_type){
835 // From short to int, long, float, double
837 if (real_target_type == TypeManager.int32_type)
838 return new EmptyCast (expr, target_type);
839 if (real_target_type == TypeManager.int64_type)
840 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
841 if (real_target_type == TypeManager.double_type)
842 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
843 if (real_target_type == TypeManager.float_type)
844 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
845 } else if (expr_type == TypeManager.ushort_type){
847 // From ushort to int, uint, long, ulong, float, double
849 if (real_target_type == TypeManager.uint32_type)
850 return new EmptyCast (expr, target_type);
852 if (real_target_type == TypeManager.uint64_type)
853 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
854 if (real_target_type == TypeManager.int32_type)
855 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
856 if (real_target_type == TypeManager.int64_type)
857 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
858 if (real_target_type == TypeManager.double_type)
859 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
860 if (real_target_type == TypeManager.float_type)
861 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
862 } else if (expr_type == TypeManager.int32_type){
864 // From int to long, float, double
866 if (real_target_type == TypeManager.int64_type)
867 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
868 if (real_target_type == TypeManager.double_type)
869 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
870 if (real_target_type == TypeManager.float_type)
871 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
872 } else if (expr_type == TypeManager.uint32_type){
874 // From uint to long, ulong, float, double
876 if (real_target_type == TypeManager.int64_type)
877 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
878 if (real_target_type == TypeManager.uint64_type)
879 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
880 if (real_target_type == TypeManager.double_type)
881 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
883 if (real_target_type == TypeManager.float_type)
884 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
886 } else if (expr_type == TypeManager.int64_type){
888 // From long/ulong to float, double
890 if (real_target_type == TypeManager.double_type)
891 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
892 if (real_target_type == TypeManager.float_type)
893 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
894 } else if (expr_type == TypeManager.uint64_type){
896 // From ulong to float, double
898 if (real_target_type == TypeManager.double_type)
899 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
901 if (real_target_type == TypeManager.float_type)
902 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
904 } else if (expr_type == TypeManager.char_type){
906 // From char to ushort, int, uint, long, ulong, float, double
908 if ((real_target_type == TypeManager.ushort_type) ||
909 (real_target_type == TypeManager.int32_type) ||
910 (real_target_type == TypeManager.uint32_type))
911 return new EmptyCast (expr, target_type);
912 if (real_target_type == TypeManager.uint64_type)
913 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
914 if (real_target_type == TypeManager.int64_type)
915 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
916 if (real_target_type == TypeManager.float_type)
917 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
918 if (real_target_type == TypeManager.double_type)
919 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
920 } else if (expr_type == TypeManager.float_type){
924 if (real_target_type == TypeManager.double_type)
925 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
932 // Tests whether an implicit reference conversion exists between expr_type
935 public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
937 Type expr_type = expr.Type;
940 // This is the boxed case.
942 if (target_type == TypeManager.object_type) {
943 if ((expr_type.IsClass) ||
944 (expr_type.IsValueType) ||
945 (expr_type.IsInterface))
948 } else if (expr_type.IsSubclassOf (target_type)) {
951 // Please remember that all code below actually comes
952 // from ImplicitReferenceConversion so make sure code remains in sync
954 // from any class-type S to any interface-type T.
955 if (target_type.IsInterface) {
956 if (TypeManager.ImplementsInterface (expr_type, target_type))
960 // from any interface type S to interface-type T.
961 if (expr_type.IsInterface && target_type.IsInterface)
962 if (TypeManager.ImplementsInterface (expr_type, target_type))
965 // from an array-type S to an array-type of type T
966 if (expr_type.IsArray && target_type.IsArray) {
967 if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
969 Type expr_element_type = expr_type.GetElementType ();
971 if (MyEmptyExpr == null)
972 MyEmptyExpr = new EmptyExpression ();
974 MyEmptyExpr.SetType (expr_element_type);
975 Type target_element_type = target_type.GetElementType ();
977 if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
978 if (StandardConversionExists (MyEmptyExpr,
979 target_element_type))
984 // from an array-type to System.Array
985 if (expr_type.IsArray && (target_type == TypeManager.array_type))
988 // from any delegate type to System.Delegate
989 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
990 target_type == TypeManager.delegate_type)
991 if (target_type.IsAssignableFrom (expr_type))
994 // from any array-type or delegate type into System.ICloneable.
995 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
996 if (target_type == TypeManager.icloneable_type)
999 // from the null type to any reference-type.
1000 if (expr is NullLiteral && !target_type.IsValueType &&
1001 !TypeManager.IsEnumType (target_type))
1010 /// Same as StandardConversionExists except that it also looks at
1011 /// implicit user defined conversions - needed for overload resolution
1013 public static bool ImplicitConversionExists (EmitContext ec, Expression expr, Type target_type)
1015 if (StandardConversionExists (expr, target_type) == true)
1018 Expression dummy = ImplicitUserConversion (ec, expr, target_type, Location.Null);
1027 /// Determines if a standard implicit conversion exists from
1028 /// expr_type to target_type
1030 public static bool StandardConversionExists (Expression expr, Type target_type)
1032 Type expr_type = expr.Type;
1034 if (expr_type == TypeManager.void_type)
1037 if (expr_type == target_type)
1040 // First numeric conversions
1042 if (expr_type == TypeManager.sbyte_type){
1044 // From sbyte to short, int, long, float, double.
1046 if ((target_type == TypeManager.int32_type) ||
1047 (target_type == TypeManager.int64_type) ||
1048 (target_type == TypeManager.double_type) ||
1049 (target_type == TypeManager.float_type) ||
1050 (target_type == TypeManager.short_type) ||
1051 (target_type == TypeManager.decimal_type))
1054 } else if (expr_type == TypeManager.byte_type){
1056 // From byte to short, ushort, int, uint, long, ulong, float, double
1058 if ((target_type == TypeManager.short_type) ||
1059 (target_type == TypeManager.ushort_type) ||
1060 (target_type == TypeManager.int32_type) ||
1061 (target_type == TypeManager.uint32_type) ||
1062 (target_type == TypeManager.uint64_type) ||
1063 (target_type == TypeManager.int64_type) ||
1064 (target_type == TypeManager.float_type) ||
1065 (target_type == TypeManager.double_type) ||
1066 (target_type == TypeManager.decimal_type))
1069 } else if (expr_type == TypeManager.short_type){
1071 // From short to int, long, float, double
1073 if ((target_type == TypeManager.int32_type) ||
1074 (target_type == TypeManager.int64_type) ||
1075 (target_type == TypeManager.double_type) ||
1076 (target_type == TypeManager.float_type) ||
1077 (target_type == TypeManager.decimal_type))
1080 } else if (expr_type == TypeManager.ushort_type){
1082 // From ushort to int, uint, long, ulong, float, double
1084 if ((target_type == TypeManager.uint32_type) ||
1085 (target_type == TypeManager.uint64_type) ||
1086 (target_type == TypeManager.int32_type) ||
1087 (target_type == TypeManager.int64_type) ||
1088 (target_type == TypeManager.double_type) ||
1089 (target_type == TypeManager.float_type) ||
1090 (target_type == TypeManager.decimal_type))
1093 } else if (expr_type == TypeManager.int32_type){
1095 // From int to long, float, double
1097 if ((target_type == TypeManager.int64_type) ||
1098 (target_type == TypeManager.double_type) ||
1099 (target_type == TypeManager.float_type) ||
1100 (target_type == TypeManager.decimal_type))
1103 } else if (expr_type == TypeManager.uint32_type){
1105 // From uint to long, ulong, float, double
1107 if ((target_type == TypeManager.int64_type) ||
1108 (target_type == TypeManager.uint64_type) ||
1109 (target_type == TypeManager.double_type) ||
1110 (target_type == TypeManager.float_type) ||
1111 (target_type == TypeManager.decimal_type))
1114 } else if ((expr_type == TypeManager.uint64_type) ||
1115 (expr_type == TypeManager.int64_type)) {
1117 // From long/ulong to float, double
1119 if ((target_type == TypeManager.double_type) ||
1120 (target_type == TypeManager.float_type) ||
1121 (target_type == TypeManager.decimal_type))
1124 } else if (expr_type == TypeManager.char_type){
1126 // From char to ushort, int, uint, long, ulong, float, double
1128 if ((target_type == TypeManager.ushort_type) ||
1129 (target_type == TypeManager.int32_type) ||
1130 (target_type == TypeManager.uint32_type) ||
1131 (target_type == TypeManager.uint64_type) ||
1132 (target_type == TypeManager.int64_type) ||
1133 (target_type == TypeManager.float_type) ||
1134 (target_type == TypeManager.double_type) ||
1135 (target_type == TypeManager.decimal_type))
1138 } else if (expr_type == TypeManager.float_type){
1142 if (target_type == TypeManager.double_type)
1146 if (ImplicitReferenceConversionExists (expr, target_type))
1149 if (expr is IntConstant){
1150 int value = ((IntConstant) expr).Value;
1152 if (target_type == TypeManager.sbyte_type){
1153 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1155 } else if (target_type == TypeManager.byte_type){
1156 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1158 } else if (target_type == TypeManager.short_type){
1159 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1161 } else if (target_type == TypeManager.ushort_type){
1162 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1164 } else if (target_type == TypeManager.uint32_type){
1167 } else if (target_type == TypeManager.uint64_type){
1169 // we can optimize this case: a positive int32
1170 // always fits on a uint64. But we need an opcode
1177 if (value == 0 && expr is IntLiteral && TypeManager.IsEnumType (target_type))
1181 if (expr is LongConstant && target_type == TypeManager.uint64_type){
1183 // Try the implicit constant expression conversion
1184 // from long to ulong, instead of a nice routine,
1185 // we just inline it
1187 long v = ((LongConstant) expr).Value;
1192 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1193 IntLiteral i = (IntLiteral) expr;
1199 if (target_type == TypeManager.void_ptr_type && expr_type.IsPointer)
1206 // Used internally by FindMostEncompassedType, this is used
1207 // to avoid creating lots of objects in the tight loop inside
1208 // FindMostEncompassedType
1210 static EmptyExpression priv_fmet_param;
1213 /// Finds "most encompassed type" according to the spec (13.4.2)
1214 /// amongst the methods in the MethodGroupExpr
1216 static Type FindMostEncompassedType (ArrayList types)
1220 if (priv_fmet_param == null)
1221 priv_fmet_param = new EmptyExpression ();
1223 foreach (Type t in types){
1224 priv_fmet_param.SetType (t);
1231 if (StandardConversionExists (priv_fmet_param, best))
1239 // Used internally by FindMostEncompassingType, this is used
1240 // to avoid creating lots of objects in the tight loop inside
1241 // FindMostEncompassingType
1243 static EmptyExpression priv_fmee_ret;
1246 /// Finds "most encompassing type" according to the spec (13.4.2)
1247 /// amongst the types in the given set
1249 static Type FindMostEncompassingType (ArrayList types)
1253 if (priv_fmee_ret == null)
1254 priv_fmee_ret = new EmptyExpression ();
1256 foreach (Type t in types){
1257 priv_fmee_ret.SetType (best);
1264 if (StandardConversionExists (priv_fmee_ret, t))
1272 // Used to avoid creating too many objects
1274 static EmptyExpression priv_fms_expr;
1277 /// Finds the most specific source Sx according to the rules of the spec (13.4.4)
1278 /// by making use of FindMostEncomp* methods. Applies the correct rules separately
1279 /// for explicit and implicit conversion operators.
1281 static public Type FindMostSpecificSource (MethodGroupExpr me, Expression source,
1282 bool apply_explicit_conv_rules,
1285 ArrayList src_types_set = new ArrayList ();
1287 if (priv_fms_expr == null)
1288 priv_fms_expr = new EmptyExpression ();
1291 // If any operator converts from S then Sx = S
1293 Type source_type = source.Type;
1294 foreach (MethodBase mb in me.Methods){
1295 ParameterData pd = Invocation.GetParameterData (mb);
1296 Type param_type = pd.ParameterType (0);
1298 if (param_type == source_type)
1301 if (apply_explicit_conv_rules) {
1304 // Find the set of applicable user-defined conversion operators, U. This set
1306 // user-defined implicit or explicit conversion operators declared by
1307 // the classes or structs in D that convert from a type encompassing
1308 // or encompassed by S to a type encompassing or encompassed by T
1310 priv_fms_expr.SetType (param_type);
1311 if (StandardConversionExists (priv_fms_expr, source_type))
1312 src_types_set.Add (param_type);
1314 if (StandardConversionExists (source, param_type))
1315 src_types_set.Add (param_type);
1319 // Only if S is encompassed by param_type
1321 if (StandardConversionExists (source, param_type))
1322 src_types_set.Add (param_type);
1327 // Explicit Conv rules
1329 if (apply_explicit_conv_rules) {
1330 ArrayList candidate_set = new ArrayList ();
1332 foreach (Type param_type in src_types_set){
1333 if (StandardConversionExists (source, param_type))
1334 candidate_set.Add (param_type);
1337 if (candidate_set.Count != 0)
1338 return FindMostEncompassedType (candidate_set);
1344 if (apply_explicit_conv_rules)
1345 return FindMostEncompassingType (src_types_set);
1347 return FindMostEncompassedType (src_types_set);
1351 // Useful in avoiding proliferation of objects
1353 static EmptyExpression priv_fmt_expr;
1356 /// Finds the most specific target Tx according to section 13.4.4
1358 static public Type FindMostSpecificTarget (MethodGroupExpr me, Type target,
1359 bool apply_explicit_conv_rules,
1362 ArrayList tgt_types_set = new ArrayList ();
1364 if (priv_fmt_expr == null)
1365 priv_fmt_expr = new EmptyExpression ();
1368 // If any operator converts to T then Tx = T
1370 foreach (MethodInfo mi in me.Methods){
1371 Type ret_type = mi.ReturnType;
1373 if (ret_type == target)
1376 if (apply_explicit_conv_rules) {
1379 // Find the set of applicable user-defined conversion operators, U.
1381 // This set consists of the
1382 // user-defined implicit or explicit conversion operators declared by
1383 // the classes or structs in D that convert from a type encompassing
1384 // or encompassed by S to a type encompassing or encompassed by T
1386 priv_fms_expr.SetType (ret_type);
1387 if (StandardConversionExists (priv_fms_expr, target))
1388 tgt_types_set.Add (ret_type);
1390 priv_fms_expr.SetType (target);
1391 if (StandardConversionExists (priv_fms_expr, ret_type))
1392 tgt_types_set.Add (ret_type);
1396 // Only if T is encompassed by param_type
1398 priv_fms_expr.SetType (ret_type);
1399 if (StandardConversionExists (priv_fms_expr, target))
1400 tgt_types_set.Add (ret_type);
1405 // Explicit conv rules
1407 if (apply_explicit_conv_rules) {
1408 ArrayList candidate_set = new ArrayList ();
1410 foreach (Type ret_type in tgt_types_set){
1411 priv_fmt_expr.SetType (ret_type);
1413 if (StandardConversionExists (priv_fmt_expr, target))
1414 candidate_set.Add (ret_type);
1417 if (candidate_set.Count != 0)
1418 return FindMostEncompassingType (candidate_set);
1422 // Okay, final case !
1424 if (apply_explicit_conv_rules)
1425 return FindMostEncompassedType (tgt_types_set);
1427 return FindMostEncompassingType (tgt_types_set);
1431 /// User-defined Implicit conversions
1433 static public Expression ImplicitUserConversion (EmitContext ec, Expression source,
1434 Type target, Location loc)
1436 return UserDefinedConversion (ec, source, target, loc, false);
1440 /// User-defined Explicit conversions
1442 static public Expression ExplicitUserConversion (EmitContext ec, Expression source,
1443 Type target, Location loc)
1445 return UserDefinedConversion (ec, source, target, loc, true);
1449 /// Computes the MethodGroup for the user-defined conversion
1450 /// operators from source_type to target_type. `look_for_explicit'
1451 /// controls whether we should also include the list of explicit
1454 static MethodGroupExpr GetConversionOperators (EmitContext ec,
1455 Type source_type, Type target_type,
1456 Location loc, bool look_for_explicit)
1458 Expression mg1 = null, mg2 = null;
1459 Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
1463 // FIXME : How does the False operator come into the picture ?
1464 // This doesn't look complete and very correct !
1466 if (target_type == TypeManager.bool_type && !look_for_explicit)
1467 op_name = "op_True";
1469 op_name = "op_Implicit";
1471 MethodGroupExpr union3;
1473 mg1 = MethodLookup (ec, source_type, op_name, loc);
1474 if (source_type.BaseType != null)
1475 mg2 = MethodLookup (ec, source_type.BaseType, op_name, loc);
1478 union3 = (MethodGroupExpr) mg2;
1479 else if (mg2 == null)
1480 union3 = (MethodGroupExpr) mg1;
1482 union3 = Invocation.MakeUnionSet (mg1, mg2, loc);
1484 mg1 = MethodLookup (ec, target_type, op_name, loc);
1487 union3 = Invocation.MakeUnionSet (union3, mg1, loc);
1489 union3 = (MethodGroupExpr) mg1;
1492 if (target_type.BaseType != null)
1493 mg1 = MethodLookup (ec, target_type.BaseType, op_name, loc);
1497 union3 = Invocation.MakeUnionSet (union3, mg1, loc);
1499 union3 = (MethodGroupExpr) mg1;
1502 MethodGroupExpr union4 = null;
1504 if (look_for_explicit) {
1505 op_name = "op_Explicit";
1507 mg5 = MemberLookup (ec, source_type, op_name, loc);
1508 if (source_type.BaseType != null)
1509 mg6 = MethodLookup (ec, source_type.BaseType, op_name, loc);
1511 mg7 = MemberLookup (ec, target_type, op_name, loc);
1512 if (target_type.BaseType != null)
1513 mg8 = MethodLookup (ec, target_type.BaseType, op_name, loc);
1515 MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6, loc);
1516 MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8, loc);
1518 union4 = Invocation.MakeUnionSet (union5, union6, loc);
1521 return Invocation.MakeUnionSet (union3, union4, loc);
1525 /// User-defined conversions
1527 static public Expression UserDefinedConversion (EmitContext ec, Expression source,
1528 Type target, Location loc,
1529 bool look_for_explicit)
1531 MethodGroupExpr union;
1532 Type source_type = source.Type;
1533 MethodBase method = null;
1535 union = GetConversionOperators (ec, source_type, target, loc, look_for_explicit);
1539 Type most_specific_source, most_specific_target;
1542 foreach (MethodBase m in union.Methods){
1543 Console.WriteLine ("Name: " + m.Name);
1544 Console.WriteLine (" : " + ((MethodInfo)m).ReturnType);
1548 most_specific_source = FindMostSpecificSource (union, source, look_for_explicit, loc);
1549 if (most_specific_source == null)
1552 most_specific_target = FindMostSpecificTarget (union, target, look_for_explicit, loc);
1553 if (most_specific_target == null)
1558 foreach (MethodBase mb in union.Methods){
1559 ParameterData pd = Invocation.GetParameterData (mb);
1560 MethodInfo mi = (MethodInfo) mb;
1562 if (pd.ParameterType (0) == most_specific_source &&
1563 mi.ReturnType == most_specific_target) {
1569 if (method == null || count > 1)
1574 // This will do the conversion to the best match that we
1575 // found. Now we need to perform an implict standard conversion
1576 // if the best match was not the type that we were requested
1579 if (look_for_explicit)
1580 source = ConvertExplicitStandard (ec, source, most_specific_source, loc);
1582 source = ConvertImplicitStandard (ec, source, most_specific_source, loc);
1588 e = new UserCast ((MethodInfo) method, source, loc);
1589 if (e.Type != target){
1590 if (!look_for_explicit)
1591 e = ConvertImplicitStandard (ec, e, target, loc);
1593 e = ConvertExplicitStandard (ec, e, target, loc);
1599 /// Converts implicitly the resolved expression `expr' into the
1600 /// `target_type'. It returns a new expression that can be used
1601 /// in a context that expects a `target_type'.
1603 static public Expression ConvertImplicit (EmitContext ec, Expression expr,
1604 Type target_type, Location loc)
1606 Type expr_type = expr.Type;
1609 if (expr_type == target_type)
1612 if (target_type == null)
1613 throw new Exception ("Target type is null");
1615 e = ConvertImplicitStandard (ec, expr, target_type, loc);
1619 e = ImplicitUserConversion (ec, expr, target_type, loc);
1628 /// Attempts to apply the `Standard Implicit
1629 /// Conversion' rules to the expression `expr' into
1630 /// the `target_type'. It returns a new expression
1631 /// that can be used in a context that expects a
1634 /// This is different from `ConvertImplicit' in that the
1635 /// user defined implicit conversions are excluded.
1637 static public Expression ConvertImplicitStandard (EmitContext ec, Expression expr,
1638 Type target_type, Location loc)
1640 Type expr_type = expr.Type;
1643 if (expr_type == target_type)
1646 e = ImplicitNumericConversion (ec, expr, target_type, loc);
1650 e = ImplicitReferenceConversion (expr, target_type);
1654 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1655 IntLiteral i = (IntLiteral) expr;
1658 return new EmptyCast (expr, target_type);
1662 if (expr_type.IsPointer){
1663 if (target_type == TypeManager.void_ptr_type)
1664 return new EmptyCast (expr, target_type);
1667 // yep, comparing pointer types cant be done with
1668 // t1 == t2, we have to compare their element types.
1670 if (target_type.IsPointer){
1671 if (target_type.GetElementType()==expr_type.GetElementType())
1676 if (target_type.IsPointer){
1677 if (expr is NullLiteral)
1678 return new EmptyCast (expr, target_type);
1686 /// Attemps to perform an implict constant conversion of the IntConstant
1687 /// into a different data type using casts (See Implicit Constant
1688 /// Expression Conversions)
1690 static protected Expression TryImplicitIntConversion (Type target_type, IntConstant ic)
1692 int value = ic.Value;
1695 // FIXME: This could return constants instead of EmptyCasts
1697 if (target_type == TypeManager.sbyte_type){
1698 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1699 return new SByteConstant ((sbyte) value);
1700 } else if (target_type == TypeManager.byte_type){
1701 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1702 return new ByteConstant ((byte) value);
1703 } else if (target_type == TypeManager.short_type){
1704 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1705 return new ShortConstant ((short) value);
1706 } else if (target_type == TypeManager.ushort_type){
1707 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1708 return new UShortConstant ((ushort) value);
1709 } else if (target_type == TypeManager.uint32_type){
1711 return new UIntConstant ((uint) value);
1712 } else if (target_type == TypeManager.uint64_type){
1714 // we can optimize this case: a positive int32
1715 // always fits on a uint64. But we need an opcode
1719 return new ULongConstant ((ulong) value);
1722 if (value == 0 && ic is IntLiteral && TypeManager.IsEnumType (target_type)){
1723 Type underlying = TypeManager.EnumToUnderlying (target_type);
1724 Constant e = (Constant) ic;
1727 // Possibly, we need to create a different 0 literal before passing
1730 if (underlying == TypeManager.int64_type)
1731 e = new LongLiteral (0);
1732 else if (underlying == TypeManager.uint64_type)
1733 e = new ULongLiteral (0);
1735 return new EnumConstant (e, target_type);
1740 static public void Error_CannotConvertImplicit (Location loc, Type source, Type target)
1742 string msg = "Cannot convert implicitly from `"+
1743 TypeManager.CSharpName (source) + "' to `" +
1744 TypeManager.CSharpName (target) + "'";
1746 Report.Error (29, loc, msg);
1750 /// Attemptes to implicityly convert `target' into `type', using
1751 /// ConvertImplicit. If there is no implicit conversion, then
1752 /// an error is signaled
1754 static public Expression ConvertImplicitRequired (EmitContext ec, Expression source,
1755 Type target_type, Location loc)
1759 e = ConvertImplicit (ec, source, target_type, loc);
1763 if (source is DoubleLiteral && target_type == TypeManager.float_type){
1764 Report.Error (664, loc,
1765 "Double literal cannot be implicitly converted to " +
1766 "float type, use F suffix to create a float literal");
1769 Error_CannotConvertImplicit (loc, source.Type, target_type);
1775 /// Performs the explicit numeric conversions
1777 static Expression ConvertNumericExplicit (EmitContext ec, Expression expr, Type target_type, Location loc)
1779 Type expr_type = expr.Type;
1782 // If we have an enumeration, extract the underlying type,
1783 // use this during the comparison, but wrap around the original
1786 Type real_target_type = target_type;
1788 if (TypeManager.IsEnumType (real_target_type))
1789 real_target_type = TypeManager.EnumToUnderlying (real_target_type);
1791 if (StandardConversionExists (expr, real_target_type)){
1792 Expression ce = ConvertImplicitStandard (ec, expr, real_target_type, loc);
1794 if (real_target_type != target_type)
1795 return new EmptyCast (ce, target_type);
1799 if (expr_type == TypeManager.sbyte_type){
1801 // From sbyte to byte, ushort, uint, ulong, char
1803 if (real_target_type == TypeManager.byte_type)
1804 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U1);
1805 if (real_target_type == TypeManager.ushort_type)
1806 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U2);
1807 if (real_target_type == TypeManager.uint32_type)
1808 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U4);
1809 if (real_target_type == TypeManager.uint64_type)
1810 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U8);
1811 if (real_target_type == TypeManager.char_type)
1812 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_CH);
1813 } else if (expr_type == TypeManager.byte_type){
1815 // From byte to sbyte and char
1817 if (real_target_type == TypeManager.sbyte_type)
1818 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_I1);
1819 if (real_target_type == TypeManager.char_type)
1820 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_CH);
1821 } else if (expr_type == TypeManager.short_type){
1823 // From short to sbyte, byte, ushort, uint, ulong, char
1825 if (real_target_type == TypeManager.sbyte_type)
1826 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_I1);
1827 if (real_target_type == TypeManager.byte_type)
1828 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U1);
1829 if (real_target_type == TypeManager.ushort_type)
1830 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U2);
1831 if (real_target_type == TypeManager.uint32_type)
1832 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U4);
1833 if (real_target_type == TypeManager.uint64_type)
1834 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U8);
1835 if (real_target_type == TypeManager.char_type)
1836 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_CH);
1837 } else if (expr_type == TypeManager.ushort_type){
1839 // From ushort to sbyte, byte, short, char
1841 if (real_target_type == TypeManager.sbyte_type)
1842 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I1);
1843 if (real_target_type == TypeManager.byte_type)
1844 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_U1);
1845 if (real_target_type == TypeManager.short_type)
1846 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I2);
1847 if (real_target_type == TypeManager.char_type)
1848 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_CH);
1849 } else if (expr_type == TypeManager.int32_type){
1851 // From int to sbyte, byte, short, ushort, uint, ulong, char
1853 if (real_target_type == TypeManager.sbyte_type)
1854 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I1);
1855 if (real_target_type == TypeManager.byte_type)
1856 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U1);
1857 if (real_target_type == TypeManager.short_type)
1858 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I2);
1859 if (real_target_type == TypeManager.ushort_type)
1860 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U2);
1861 if (real_target_type == TypeManager.uint32_type)
1862 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U4);
1863 if (real_target_type == TypeManager.uint64_type)
1864 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U8);
1865 if (real_target_type == TypeManager.char_type)
1866 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_CH);
1867 } else if (expr_type == TypeManager.uint32_type){
1869 // From uint to sbyte, byte, short, ushort, int, char
1871 if (real_target_type == TypeManager.sbyte_type)
1872 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I1);
1873 if (real_target_type == TypeManager.byte_type)
1874 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U1);
1875 if (real_target_type == TypeManager.short_type)
1876 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I2);
1877 if (real_target_type == TypeManager.ushort_type)
1878 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U2);
1879 if (real_target_type == TypeManager.int32_type)
1880 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I4);
1881 if (real_target_type == TypeManager.char_type)
1882 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_CH);
1883 } else if (expr_type == TypeManager.int64_type){
1885 // From long to sbyte, byte, short, ushort, int, uint, ulong, char
1887 if (real_target_type == TypeManager.sbyte_type)
1888 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I1);
1889 if (real_target_type == TypeManager.byte_type)
1890 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U1);
1891 if (real_target_type == TypeManager.short_type)
1892 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I2);
1893 if (real_target_type == TypeManager.ushort_type)
1894 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U2);
1895 if (real_target_type == TypeManager.int32_type)
1896 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I4);
1897 if (real_target_type == TypeManager.uint32_type)
1898 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U4);
1899 if (real_target_type == TypeManager.uint64_type)
1900 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U8);
1901 if (real_target_type == TypeManager.char_type)
1902 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_CH);
1903 } else if (expr_type == TypeManager.uint64_type){
1905 // From ulong to sbyte, byte, short, ushort, int, uint, long, char
1907 if (real_target_type == TypeManager.sbyte_type)
1908 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I1);
1909 if (real_target_type == TypeManager.byte_type)
1910 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U1);
1911 if (real_target_type == TypeManager.short_type)
1912 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I2);
1913 if (real_target_type == TypeManager.ushort_type)
1914 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U2);
1915 if (real_target_type == TypeManager.int32_type)
1916 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I4);
1917 if (real_target_type == TypeManager.uint32_type)
1918 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U4);
1919 if (real_target_type == TypeManager.int64_type)
1920 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I8);
1921 if (real_target_type == TypeManager.char_type)
1922 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_CH);
1923 } else if (expr_type == TypeManager.char_type){
1925 // From char to sbyte, byte, short
1927 if (real_target_type == TypeManager.sbyte_type)
1928 return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I1);
1929 if (real_target_type == TypeManager.byte_type)
1930 return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_U1);
1931 if (real_target_type == TypeManager.short_type)
1932 return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I2);
1933 } else if (expr_type == TypeManager.float_type){
1935 // From float to sbyte, byte, short,
1936 // ushort, int, uint, long, ulong, char
1939 if (real_target_type == TypeManager.sbyte_type)
1940 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I1);
1941 if (real_target_type == TypeManager.byte_type)
1942 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U1);
1943 if (real_target_type == TypeManager.short_type)
1944 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I2);
1945 if (real_target_type == TypeManager.ushort_type)
1946 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U2);
1947 if (real_target_type == TypeManager.int32_type)
1948 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I4);
1949 if (real_target_type == TypeManager.uint32_type)
1950 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U4);
1951 if (real_target_type == TypeManager.int64_type)
1952 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I8);
1953 if (real_target_type == TypeManager.uint64_type)
1954 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U8);
1955 if (real_target_type == TypeManager.char_type)
1956 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_CH);
1957 } else if (expr_type == TypeManager.double_type){
1959 // From double to byte, byte, short,
1960 // ushort, int, uint, long, ulong,
1961 // char, float or decimal
1963 if (real_target_type == TypeManager.sbyte_type)
1964 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I1);
1965 if (real_target_type == TypeManager.byte_type)
1966 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U1);
1967 if (real_target_type == TypeManager.short_type)
1968 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I2);
1969 if (real_target_type == TypeManager.ushort_type)
1970 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U2);
1971 if (real_target_type == TypeManager.int32_type)
1972 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I4);
1973 if (real_target_type == TypeManager.uint32_type)
1974 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U4);
1975 if (real_target_type == TypeManager.int64_type)
1976 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I8);
1977 if (real_target_type == TypeManager.uint64_type)
1978 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U8);
1979 if (real_target_type == TypeManager.char_type)
1980 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_CH);
1981 if (real_target_type == TypeManager.float_type)
1982 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_R4);
1985 // decimal is taken care of by the op_Explicit methods.
1991 /// Returns whether an explicit reference conversion can be performed
1992 /// from source_type to target_type
1994 public static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
1996 bool target_is_value_type = target_type.IsValueType;
1998 if (source_type == target_type)
2002 // From object to any reference type
2004 if (source_type == TypeManager.object_type && !target_is_value_type)
2008 // From any class S to any class-type T, provided S is a base class of T
2010 if (target_type.IsSubclassOf (source_type))
2014 // From any interface type S to any interface T provided S is not derived from T
2016 if (source_type.IsInterface && target_type.IsInterface){
2017 if (!target_type.IsSubclassOf (source_type))
2022 // From any class type S to any interface T, provided S is not sealed
2023 // and provided S does not implement T.
2025 if (target_type.IsInterface && !source_type.IsSealed &&
2026 !TypeManager.ImplementsInterface (source_type, target_type))
2030 // From any interface-type S to to any class type T, provided T is not
2031 // sealed, or provided T implements S.
2033 if (source_type.IsInterface &&
2034 (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type)))
2038 // From an array type S with an element type Se to an array type T with an
2039 // element type Te provided all the following are true:
2040 // * S and T differe only in element type, in other words, S and T
2041 // have the same number of dimensions.
2042 // * Both Se and Te are reference types
2043 // * An explicit referenc conversions exist from Se to Te
2045 if (source_type.IsArray && target_type.IsArray) {
2046 if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
2048 Type source_element_type = source_type.GetElementType ();
2049 Type target_element_type = target_type.GetElementType ();
2051 if (!source_element_type.IsValueType && !target_element_type.IsValueType)
2052 if (ExplicitReferenceConversionExists (source_element_type,
2053 target_element_type))
2059 // From System.Array to any array-type
2060 if (source_type == TypeManager.array_type &&
2061 target_type.IsArray){
2066 // From System delegate to any delegate-type
2068 if (source_type == TypeManager.delegate_type &&
2069 target_type.IsSubclassOf (TypeManager.delegate_type))
2073 // From ICloneable to Array or Delegate types
2075 if (source_type == TypeManager.icloneable_type &&
2076 (target_type == TypeManager.array_type ||
2077 target_type == TypeManager.delegate_type))
2084 /// Implements Explicit Reference conversions
2086 static Expression ConvertReferenceExplicit (Expression source, Type target_type)
2088 Type source_type = source.Type;
2089 bool target_is_value_type = target_type.IsValueType;
2092 // From object to any reference type
2094 if (source_type == TypeManager.object_type && !target_is_value_type)
2095 return new ClassCast (source, target_type);
2099 // From any class S to any class-type T, provided S is a base class of T
2101 if (target_type.IsSubclassOf (source_type))
2102 return new ClassCast (source, target_type);
2105 // From any interface type S to any interface T provided S is not derived from T
2107 if (source_type.IsInterface && target_type.IsInterface){
2108 if (TypeManager.ImplementsInterface (source_type, target_type))
2111 return new ClassCast (source, target_type);
2115 // From any class type S to any interface T, provides S is not sealed
2116 // and provided S does not implement T.
2118 if (target_type.IsInterface && !source_type.IsSealed) {
2119 if (TypeManager.ImplementsInterface (source_type, target_type))
2122 return new ClassCast (source, target_type);
2127 // From any interface-type S to to any class type T, provided T is not
2128 // sealed, or provided T implements S.
2130 if (source_type.IsInterface) {
2131 if (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type))
2132 return new ClassCast (source, target_type);
2137 // From an array type S with an element type Se to an array type T with an
2138 // element type Te provided all the following are true:
2139 // * S and T differe only in element type, in other words, S and T
2140 // have the same number of dimensions.
2141 // * Both Se and Te are reference types
2142 // * An explicit referenc conversions exist from Se to Te
2144 if (source_type.IsArray && target_type.IsArray) {
2145 if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
2147 Type source_element_type = source_type.GetElementType ();
2148 Type target_element_type = target_type.GetElementType ();
2150 if (!source_element_type.IsValueType && !target_element_type.IsValueType)
2151 if (ExplicitReferenceConversionExists (source_element_type,
2152 target_element_type))
2153 return new ClassCast (source, target_type);
2158 // From System.Array to any array-type
2159 if (source_type == TypeManager.array_type &&
2160 target_type.IsArray) {
2161 return new ClassCast (source, target_type);
2165 // From System delegate to any delegate-type
2167 if (source_type == TypeManager.delegate_type &&
2168 target_type.IsSubclassOf (TypeManager.delegate_type))
2169 return new ClassCast (source, target_type);
2172 // From ICloneable to Array or Delegate types
2174 if (source_type == TypeManager.icloneable_type &&
2175 (target_type == TypeManager.array_type ||
2176 target_type == TypeManager.delegate_type))
2177 return new ClassCast (source, target_type);
2183 /// Performs an explicit conversion of the expression `expr' whose
2184 /// type is expr.Type to `target_type'.
2186 static public Expression ConvertExplicit (EmitContext ec, Expression expr,
2187 Type target_type, Location loc)
2189 Type expr_type = expr.Type;
2190 Expression ne = ConvertImplicitStandard (ec, expr, target_type, loc);
2195 ne = ConvertNumericExplicit (ec, expr, target_type, loc);
2200 // Unboxing conversion.
2202 if (expr_type == TypeManager.object_type && target_type.IsValueType)
2203 return new UnboxCast (expr, target_type);
2208 if (expr_type.IsSubclassOf (TypeManager.enum_type)) {
2212 // FIXME: Is there any reason we should have EnumConstant
2213 // dealt with here instead of just using always the
2214 // UnderlyingSystemType to wrap the type?
2216 if (expr is EnumConstant)
2217 e = ((EnumConstant) expr).Child;
2219 e = new EmptyCast (expr, TypeManager.EnumToUnderlying (expr_type));
2222 Expression t = ConvertImplicit (ec, e, target_type, loc);
2226 t = ConvertNumericExplicit (ec, e, target_type, loc);
2230 Error_CannotConvertType (loc, expr_type, target_type);
2234 ne = ConvertReferenceExplicit (expr, target_type);
2239 if (target_type.IsPointer){
2240 if (expr_type.IsPointer)
2241 return new EmptyCast (expr, target_type);
2243 if (expr_type == TypeManager.sbyte_type ||
2244 expr_type == TypeManager.byte_type ||
2245 expr_type == TypeManager.short_type ||
2246 expr_type == TypeManager.ushort_type ||
2247 expr_type == TypeManager.int32_type ||
2248 expr_type == TypeManager.uint32_type ||
2249 expr_type == TypeManager.uint64_type ||
2250 expr_type == TypeManager.int64_type)
2251 return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
2253 if (expr_type.IsPointer){
2254 if (target_type == TypeManager.sbyte_type ||
2255 target_type == TypeManager.byte_type ||
2256 target_type == TypeManager.short_type ||
2257 target_type == TypeManager.ushort_type ||
2258 target_type == TypeManager.int32_type ||
2259 target_type == TypeManager.uint32_type ||
2260 target_type == TypeManager.uint64_type ||
2261 target_type == TypeManager.int64_type){
2262 Expression e = new EmptyCast (expr, TypeManager.uint32_type);
2265 ci = ConvertImplicitStandard (ec, e, target_type, loc);
2270 ce = ConvertNumericExplicit (ec, e, target_type, loc);
2274 // We should always be able to go from an uint32
2275 // implicitly or explicitly to the other integral
2278 throw new Exception ("Internal compiler error");
2283 ne = ExplicitUserConversion (ec, expr, target_type, loc);
2287 Error_CannotConvertType (loc, expr_type, target_type);
2292 /// Same as ConvertExplicit, only it doesn't include user defined conversions
2294 static public Expression ConvertExplicitStandard (EmitContext ec, Expression expr,
2295 Type target_type, Location l)
2297 Expression ne = ConvertImplicitStandard (ec, expr, target_type, l);
2302 ne = ConvertNumericExplicit (ec, expr, target_type, l);
2306 ne = ConvertReferenceExplicit (expr, target_type);
2310 Error_CannotConvertType (l, expr.Type, target_type);
2314 static string ExprClassName (ExprClass c)
2317 case ExprClass.Invalid:
2319 case ExprClass.Value:
2321 case ExprClass.Variable:
2323 case ExprClass.Namespace:
2325 case ExprClass.Type:
2327 case ExprClass.MethodGroup:
2328 return "method group";
2329 case ExprClass.PropertyAccess:
2330 return "property access";
2331 case ExprClass.EventAccess:
2332 return "event access";
2333 case ExprClass.IndexerAccess:
2334 return "indexer access";
2335 case ExprClass.Nothing:
2338 throw new Exception ("Should not happen");
2342 /// Reports that we were expecting `expr' to be of class `expected'
2344 public void Error118 (string expected)
2346 string kind = "Unknown";
2348 kind = ExprClassName (eclass);
2350 Error (118, "Expression denotes a `" + kind +
2351 "' where a `" + expected + "' was expected");
2354 public void Error118 (ResolveFlags flags)
2356 ArrayList valid = new ArrayList (10);
2358 if ((flags & ResolveFlags.VariableOrValue) != 0) {
2359 valid.Add ("variable");
2360 valid.Add ("value");
2363 if ((flags & ResolveFlags.Type) != 0)
2366 if ((flags & ResolveFlags.MethodGroup) != 0)
2367 valid.Add ("method group");
2369 if ((flags & ResolveFlags.SimpleName) != 0)
2370 valid.Add ("simple name");
2372 if (valid.Count == 0)
2373 valid.Add ("unknown");
2375 StringBuilder sb = new StringBuilder ();
2376 for (int i = 0; i < valid.Count; i++) {
2379 else if (i == valid.Count)
2381 sb.Append (valid [i]);
2384 string kind = ExprClassName (eclass);
2386 Error (119, "Expression denotes a `" + kind + "' where " +
2387 "a `" + sb.ToString () + "' was expected");
2390 static void Error_ConstantValueCannotBeConverted (Location l, string val, Type t)
2392 Report.Error (31, l, "Constant value `" + val + "' cannot be converted to " +
2393 TypeManager.CSharpName (t));
2396 public static void UnsafeError (Location loc)
2398 Report.Error (214, loc, "Pointers may only be used in an unsafe context");
2402 /// Converts the IntConstant, UIntConstant, LongConstant or
2403 /// ULongConstant into the integral target_type. Notice
2404 /// that we do not return an `Expression' we do return
2405 /// a boxed integral type.
2407 /// FIXME: Since I added the new constants, we need to
2408 /// also support conversions from CharConstant, ByteConstant,
2409 /// SByteConstant, UShortConstant, ShortConstant
2411 /// This is used by the switch statement, so the domain
2412 /// of work is restricted to the literals above, and the
2413 /// targets are int32, uint32, char, byte, sbyte, ushort,
2414 /// short, uint64 and int64
2416 public static object ConvertIntLiteral (Constant c, Type target_type, Location loc)
2420 if (c.Type == target_type)
2421 return ((Constant) c).GetValue ();
2424 // Make into one of the literals we handle, we dont really care
2425 // about this value as we will just return a few limited types
2427 if (c is EnumConstant)
2428 c = ((EnumConstant)c).WidenToCompilerConstant ();
2430 if (c is IntConstant){
2431 int v = ((IntConstant) c).Value;
2433 if (target_type == TypeManager.uint32_type){
2436 } else if (target_type == TypeManager.char_type){
2437 if (v >= Char.MinValue && v <= Char.MaxValue)
2439 } else if (target_type == TypeManager.byte_type){
2440 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2442 } else if (target_type == TypeManager.sbyte_type){
2443 if (v >= SByte.MinValue && v <= SByte.MaxValue)
2445 } else if (target_type == TypeManager.short_type){
2446 if (v >= Int16.MinValue && v <= UInt16.MaxValue)
2448 } else if (target_type == TypeManager.ushort_type){
2449 if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
2451 } else if (target_type == TypeManager.int64_type)
2453 else if (target_type == TypeManager.uint64_type){
2459 } else if (c is UIntConstant){
2460 uint v = ((UIntConstant) c).Value;
2462 if (target_type == TypeManager.int32_type){
2463 if (v <= Int32.MaxValue)
2465 } else if (target_type == TypeManager.char_type){
2466 if (v >= Char.MinValue && v <= Char.MaxValue)
2468 } else if (target_type == TypeManager.byte_type){
2469 if (v <= Byte.MaxValue)
2471 } else if (target_type == TypeManager.sbyte_type){
2472 if (v <= SByte.MaxValue)
2474 } else if (target_type == TypeManager.short_type){
2475 if (v <= UInt16.MaxValue)
2477 } else if (target_type == TypeManager.ushort_type){
2478 if (v <= UInt16.MaxValue)
2480 } else if (target_type == TypeManager.int64_type)
2482 else if (target_type == TypeManager.uint64_type)
2485 } else if (c is LongConstant){
2486 long v = ((LongConstant) c).Value;
2488 if (target_type == TypeManager.int32_type){
2489 if (v >= UInt32.MinValue && v <= UInt32.MaxValue)
2491 } else if (target_type == TypeManager.uint32_type){
2492 if (v >= 0 && v <= UInt32.MaxValue)
2494 } else if (target_type == TypeManager.char_type){
2495 if (v >= Char.MinValue && v <= Char.MaxValue)
2497 } else if (target_type == TypeManager.byte_type){
2498 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2500 } else if (target_type == TypeManager.sbyte_type){
2501 if (v >= SByte.MinValue && v <= SByte.MaxValue)
2503 } else if (target_type == TypeManager.short_type){
2504 if (v >= Int16.MinValue && v <= UInt16.MaxValue)
2506 } else if (target_type == TypeManager.ushort_type){
2507 if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
2509 } else if (target_type == TypeManager.uint64_type){
2514 } else if (c is ULongConstant){
2515 ulong v = ((ULongConstant) c).Value;
2517 if (target_type == TypeManager.int32_type){
2518 if (v <= Int32.MaxValue)
2520 } else if (target_type == TypeManager.uint32_type){
2521 if (v <= UInt32.MaxValue)
2523 } else if (target_type == TypeManager.char_type){
2524 if (v >= Char.MinValue && v <= Char.MaxValue)
2526 } else if (target_type == TypeManager.byte_type){
2527 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2529 } else if (target_type == TypeManager.sbyte_type){
2530 if (v <= (int) SByte.MaxValue)
2532 } else if (target_type == TypeManager.short_type){
2533 if (v <= UInt16.MaxValue)
2535 } else if (target_type == TypeManager.ushort_type){
2536 if (v <= UInt16.MaxValue)
2538 } else if (target_type == TypeManager.int64_type){
2539 if (v <= Int64.MaxValue)
2543 } else if (c is ByteConstant){
2544 byte v = ((ByteConstant) c).Value;
2546 if (target_type == TypeManager.int32_type)
2548 else if (target_type == TypeManager.uint32_type)
2550 else if (target_type == TypeManager.char_type)
2552 else if (target_type == TypeManager.sbyte_type){
2553 if (v <= SByte.MaxValue)
2555 } else if (target_type == TypeManager.short_type)
2557 else if (target_type == TypeManager.ushort_type)
2559 else if (target_type == TypeManager.int64_type)
2561 else if (target_type == TypeManager.uint64_type)
2564 } else if (c is SByteConstant){
2565 sbyte v = ((SByteConstant) c).Value;
2567 if (target_type == TypeManager.int32_type)
2569 else if (target_type == TypeManager.uint32_type){
2572 } else if (target_type == TypeManager.char_type){
2575 } else if (target_type == TypeManager.byte_type){
2578 } else if (target_type == TypeManager.short_type)
2580 else if (target_type == TypeManager.ushort_type){
2583 } else if (target_type == TypeManager.int64_type)
2585 else if (target_type == TypeManager.uint64_type){
2590 } else if (c is ShortConstant){
2591 short v = ((ShortConstant) c).Value;
2593 if (target_type == TypeManager.int32_type){
2595 } else if (target_type == TypeManager.uint32_type){
2598 } else if (target_type == TypeManager.char_type){
2601 } else if (target_type == TypeManager.byte_type){
2602 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2604 } else if (target_type == TypeManager.sbyte_type){
2605 if (v >= SByte.MinValue && v <= SByte.MaxValue)
2607 } else if (target_type == TypeManager.ushort_type){
2610 } else if (target_type == TypeManager.int64_type)
2612 else if (target_type == TypeManager.uint64_type)
2616 } else if (c is UShortConstant){
2617 ushort v = ((UShortConstant) c).Value;
2619 if (target_type == TypeManager.int32_type)
2621 else if (target_type == TypeManager.uint32_type)
2623 else if (target_type == TypeManager.char_type){
2624 if (v >= Char.MinValue && v <= Char.MaxValue)
2626 } else if (target_type == TypeManager.byte_type){
2627 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2629 } else if (target_type == TypeManager.sbyte_type){
2630 if (v <= SByte.MaxValue)
2632 } else if (target_type == TypeManager.short_type){
2633 if (v <= Int16.MaxValue)
2635 } else if (target_type == TypeManager.int64_type)
2637 else if (target_type == TypeManager.uint64_type)
2641 } else if (c is CharConstant){
2642 char v = ((CharConstant) c).Value;
2644 if (target_type == TypeManager.int32_type)
2646 else if (target_type == TypeManager.uint32_type)
2648 else if (target_type == TypeManager.byte_type){
2649 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2651 } else if (target_type == TypeManager.sbyte_type){
2652 if (v <= SByte.MaxValue)
2654 } else if (target_type == TypeManager.short_type){
2655 if (v <= Int16.MaxValue)
2657 } else if (target_type == TypeManager.ushort_type)
2659 else if (target_type == TypeManager.int64_type)
2661 else if (target_type == TypeManager.uint64_type)
2666 Error_ConstantValueCannotBeConverted (loc, s, target_type);
2671 // Load the object from the pointer.
2673 public static void LoadFromPtr (ILGenerator ig, Type t)
2675 if (t == TypeManager.int32_type)
2676 ig.Emit (OpCodes.Ldind_I4);
2677 else if (t == TypeManager.uint32_type)
2678 ig.Emit (OpCodes.Ldind_U4);
2679 else if (t == TypeManager.short_type)
2680 ig.Emit (OpCodes.Ldind_I2);
2681 else if (t == TypeManager.ushort_type)
2682 ig.Emit (OpCodes.Ldind_U2);
2683 else if (t == TypeManager.char_type)
2684 ig.Emit (OpCodes.Ldind_U2);
2685 else if (t == TypeManager.byte_type)
2686 ig.Emit (OpCodes.Ldind_U1);
2687 else if (t == TypeManager.sbyte_type)
2688 ig.Emit (OpCodes.Ldind_I1);
2689 else if (t == TypeManager.uint64_type)
2690 ig.Emit (OpCodes.Ldind_I8);
2691 else if (t == TypeManager.int64_type)
2692 ig.Emit (OpCodes.Ldind_I8);
2693 else if (t == TypeManager.float_type)
2694 ig.Emit (OpCodes.Ldind_R4);
2695 else if (t == TypeManager.double_type)
2696 ig.Emit (OpCodes.Ldind_R8);
2697 else if (t == TypeManager.bool_type)
2698 ig.Emit (OpCodes.Ldind_I1);
2699 else if (t == TypeManager.intptr_type)
2700 ig.Emit (OpCodes.Ldind_I);
2701 else if (TypeManager.IsEnumType (t)) {
2702 if (t == TypeManager.enum_type)
2703 ig.Emit (OpCodes.Ldind_Ref);
2705 LoadFromPtr (ig, TypeManager.EnumToUnderlying (t));
2706 } else if (t.IsValueType)
2707 ig.Emit (OpCodes.Ldobj, t);
2709 ig.Emit (OpCodes.Ldind_Ref);
2713 // The stack contains the pointer and the value of type `type'
2715 public static void StoreFromPtr (ILGenerator ig, Type type)
2717 if (TypeManager.IsEnumType (type))
2718 type = TypeManager.EnumToUnderlying (type);
2719 if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
2720 ig.Emit (OpCodes.Stind_I4);
2721 else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
2722 ig.Emit (OpCodes.Stind_I8);
2723 else if (type == TypeManager.char_type || type == TypeManager.short_type ||
2724 type == TypeManager.ushort_type)
2725 ig.Emit (OpCodes.Stind_I2);
2726 else if (type == TypeManager.float_type)
2727 ig.Emit (OpCodes.Stind_R4);
2728 else if (type == TypeManager.double_type)
2729 ig.Emit (OpCodes.Stind_R8);
2730 else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
2731 type == TypeManager.bool_type)
2732 ig.Emit (OpCodes.Stind_I1);
2733 else if (type == TypeManager.intptr_type)
2734 ig.Emit (OpCodes.Stind_I);
2735 else if (type.IsValueType)
2736 ig.Emit (OpCodes.Stobj, type);
2738 ig.Emit (OpCodes.Stind_Ref);
2742 // Returns the size of type `t' if known, otherwise, 0
2744 public static int GetTypeSize (Type t)
2746 t = TypeManager.TypeToCoreType (t);
2747 if (t == TypeManager.int32_type ||
2748 t == TypeManager.uint32_type ||
2749 t == TypeManager.float_type)
2751 else if (t == TypeManager.int64_type ||
2752 t == TypeManager.uint64_type ||
2753 t == TypeManager.double_type)
2755 else if (t == TypeManager.byte_type ||
2756 t == TypeManager.sbyte_type ||
2757 t == TypeManager.bool_type)
2759 else if (t == TypeManager.short_type ||
2760 t == TypeManager.char_type ||
2761 t == TypeManager.ushort_type)
2763 else if (t == TypeManager.decimal_type)
2770 // Default implementation of IAssignMethod.CacheTemporaries
2772 public void CacheTemporaries (EmitContext ec)
2776 static void Error_NegativeArrayIndex (Location loc)
2778 Report.Error (284, loc, "Can not create array with a negative size");
2782 // Converts `source' to an int, uint, long or ulong.
2784 public Expression ExpressionToArrayArgument (EmitContext ec, Expression source, Location loc)
2788 bool old_checked = ec.CheckState;
2789 ec.CheckState = true;
2791 target = ConvertImplicit (ec, source, TypeManager.int32_type, loc);
2792 if (target == null){
2793 target = ConvertImplicit (ec, source, TypeManager.uint32_type, loc);
2794 if (target == null){
2795 target = ConvertImplicit (ec, source, TypeManager.int64_type, loc);
2796 if (target == null){
2797 target = ConvertImplicit (ec, source, TypeManager.uint64_type, loc);
2799 Expression.Error_CannotConvertImplicit (loc, source.Type, TypeManager.int32_type);
2803 ec.CheckState = old_checked;
2806 // Only positive constants are allowed at compile time
2808 if (target is Constant){
2809 if (target is IntConstant){
2810 if (((IntConstant) target).Value < 0){
2811 Error_NegativeArrayIndex (loc);
2816 if (target is LongConstant){
2817 if (((LongConstant) target).Value < 0){
2818 Error_NegativeArrayIndex (loc);
2831 /// This is just a base class for expressions that can
2832 /// appear on statements (invocations, object creation,
2833 /// assignments, post/pre increment and decrement). The idea
2834 /// being that they would support an extra Emition interface that
2835 /// does not leave a result on the stack.
2837 public abstract class ExpressionStatement : Expression {
2840 /// Requests the expression to be emitted in a `statement'
2841 /// context. This means that no new value is left on the
2842 /// stack after invoking this method (constrasted with
2843 /// Emit that will always leave a value on the stack).
2845 public abstract void EmitStatement (EmitContext ec);
2849 /// This kind of cast is used to encapsulate the child
2850 /// whose type is child.Type into an expression that is
2851 /// reported to return "return_type". This is used to encapsulate
2852 /// expressions which have compatible types, but need to be dealt
2853 /// at higher levels with.
2855 /// For example, a "byte" expression could be encapsulated in one
2856 /// of these as an "unsigned int". The type for the expression
2857 /// would be "unsigned int".
2860 public class EmptyCast : Expression {
2861 protected Expression child;
2863 public EmptyCast (Expression child, Type return_type)
2865 eclass = child.eclass;
2870 public override Expression DoResolve (EmitContext ec)
2872 // This should never be invoked, we are born in fully
2873 // initialized state.
2878 public override void Emit (EmitContext ec)
2885 /// This class is used to wrap literals which belong inside Enums
2887 public class EnumConstant : Constant {
2888 public Constant Child;
2890 public EnumConstant (Constant child, Type enum_type)
2892 eclass = child.eclass;
2897 public override Expression DoResolve (EmitContext ec)
2899 // This should never be invoked, we are born in fully
2900 // initialized state.
2905 public override void Emit (EmitContext ec)
2910 public override object GetValue ()
2912 return Child.GetValue ();
2916 // Converts from one of the valid underlying types for an enumeration
2917 // (int32, uint32, int64, uint64, short, ushort, byte, sbyte) to
2918 // one of the internal compiler literals: Int/UInt/Long/ULong Literals.
2920 public Constant WidenToCompilerConstant ()
2922 Type t = TypeManager.EnumToUnderlying (Child.Type);
2923 object v = ((Constant) Child).GetValue ();;
2925 if (t == TypeManager.int32_type)
2926 return new IntConstant ((int) v);
2927 if (t == TypeManager.uint32_type)
2928 return new UIntConstant ((uint) v);
2929 if (t == TypeManager.int64_type)
2930 return new LongConstant ((long) v);
2931 if (t == TypeManager.uint64_type)
2932 return new ULongConstant ((ulong) v);
2933 if (t == TypeManager.short_type)
2934 return new ShortConstant ((short) v);
2935 if (t == TypeManager.ushort_type)
2936 return new UShortConstant ((ushort) v);
2937 if (t == TypeManager.byte_type)
2938 return new ByteConstant ((byte) v);
2939 if (t == TypeManager.sbyte_type)
2940 return new SByteConstant ((sbyte) v);
2942 throw new Exception ("Invalid enumeration underlying type: " + t);
2946 // Extracts the value in the enumeration on its native representation
2948 public object GetPlainValue ()
2950 Type t = TypeManager.EnumToUnderlying (Child.Type);
2951 object v = ((Constant) Child).GetValue ();;
2953 if (t == TypeManager.int32_type)
2955 if (t == TypeManager.uint32_type)
2957 if (t == TypeManager.int64_type)
2959 if (t == TypeManager.uint64_type)
2961 if (t == TypeManager.short_type)
2963 if (t == TypeManager.ushort_type)
2965 if (t == TypeManager.byte_type)
2967 if (t == TypeManager.sbyte_type)
2973 public override string AsString ()
2975 return Child.AsString ();
2978 public override DoubleConstant ConvertToDouble ()
2980 return Child.ConvertToDouble ();
2983 public override FloatConstant ConvertToFloat ()
2985 return Child.ConvertToFloat ();
2988 public override ULongConstant ConvertToULong ()
2990 return Child.ConvertToULong ();
2993 public override LongConstant ConvertToLong ()
2995 return Child.ConvertToLong ();
2998 public override UIntConstant ConvertToUInt ()
3000 return Child.ConvertToUInt ();
3003 public override IntConstant ConvertToInt ()
3005 return Child.ConvertToInt ();
3010 /// This kind of cast is used to encapsulate Value Types in objects.
3012 /// The effect of it is to box the value type emitted by the previous
3015 public class BoxedCast : EmptyCast {
3017 public BoxedCast (Expression expr)
3018 : base (expr, TypeManager.object_type)
3022 public override Expression DoResolve (EmitContext ec)
3024 // This should never be invoked, we are born in fully
3025 // initialized state.
3030 public override void Emit (EmitContext ec)
3034 ec.ig.Emit (OpCodes.Box, child.Type);
3038 public class UnboxCast : EmptyCast {
3039 public UnboxCast (Expression expr, Type return_type)
3040 : base (expr, return_type)
3044 public override Expression DoResolve (EmitContext ec)
3046 // This should never be invoked, we are born in fully
3047 // initialized state.
3052 public override void Emit (EmitContext ec)
3055 ILGenerator ig = ec.ig;
3058 ig.Emit (OpCodes.Unbox, t);
3060 LoadFromPtr (ig, t);
3065 /// This is used to perform explicit numeric conversions.
3067 /// Explicit numeric conversions might trigger exceptions in a checked
3068 /// context, so they should generate the conv.ovf opcodes instead of
3071 public class ConvCast : EmptyCast {
3072 public enum Mode : byte {
3073 I1_U1, I1_U2, I1_U4, I1_U8, I1_CH,
3075 I2_I1, I2_U1, I2_U2, I2_U4, I2_U8, I2_CH,
3076 U2_I1, U2_U1, U2_I2, U2_CH,
3077 I4_I1, I4_U1, I4_I2, I4_U2, I4_U4, I4_U8, I4_CH,
3078 U4_I1, U4_U1, U4_I2, U4_U2, U4_I4, U4_CH,
3079 I8_I1, I8_U1, I8_I2, I8_U2, I8_I4, I8_U4, I8_U8, I8_CH,
3080 U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH,
3081 CH_I1, CH_U1, CH_I2,
3082 R4_I1, R4_U1, R4_I2, R4_U2, R4_I4, R4_U4, R4_I8, R4_U8, R4_CH,
3083 R8_I1, R8_U1, R8_I2, R8_U2, R8_I4, R8_U4, R8_I8, R8_U8, R8_CH, R8_R4
3089 public ConvCast (EmitContext ec, Expression child, Type return_type, Mode m)
3090 : base (child, return_type)
3092 checked_state = ec.CheckState;
3096 public override Expression DoResolve (EmitContext ec)
3098 // This should never be invoked, we are born in fully
3099 // initialized state.
3104 public override void Emit (EmitContext ec)
3106 ILGenerator ig = ec.ig;
3112 case Mode.I1_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3113 case Mode.I1_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3114 case Mode.I1_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3115 case Mode.I1_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3116 case Mode.I1_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3118 case Mode.U1_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3119 case Mode.U1_CH: /* nothing */ break;
3121 case Mode.I2_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3122 case Mode.I2_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3123 case Mode.I2_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3124 case Mode.I2_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3125 case Mode.I2_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3126 case Mode.I2_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3128 case Mode.U2_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3129 case Mode.U2_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
3130 case Mode.U2_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
3131 case Mode.U2_CH: /* nothing */ break;
3133 case Mode.I4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3134 case Mode.I4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3135 case Mode.I4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
3136 case Mode.I4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3137 case Mode.I4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3138 case Mode.I4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3139 case Mode.I4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3141 case Mode.U4_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3142 case Mode.U4_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
3143 case Mode.U4_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
3144 case Mode.U4_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
3145 case Mode.U4_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
3146 case Mode.U4_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
3148 case Mode.I8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3149 case Mode.I8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3150 case Mode.I8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
3151 case Mode.I8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3152 case Mode.I8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
3153 case Mode.I8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3154 case Mode.I8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3155 case Mode.I8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3157 case Mode.U8_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3158 case Mode.U8_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
3159 case Mode.U8_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
3160 case Mode.U8_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
3161 case Mode.U8_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
3162 case Mode.U8_U4: ig.Emit (OpCodes.Conv_Ovf_U4_Un); break;
3163 case Mode.U8_I8: ig.Emit (OpCodes.Conv_Ovf_I8_Un); break;
3164 case Mode.U8_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
3166 case Mode.CH_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3167 case Mode.CH_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
3168 case Mode.CH_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
3170 case Mode.R4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3171 case Mode.R4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3172 case Mode.R4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
3173 case Mode.R4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3174 case Mode.R4_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
3175 case Mode.R4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3176 case Mode.R4_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
3177 case Mode.R4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3178 case Mode.R4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3180 case Mode.R8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3181 case Mode.R8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3182 case Mode.R8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
3183 case Mode.R8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3184 case Mode.R8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
3185 case Mode.R8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3186 case Mode.R8_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
3187 case Mode.R8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3188 case Mode.R8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3189 case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
3193 case Mode.I1_U1: ig.Emit (OpCodes.Conv_U1); break;
3194 case Mode.I1_U2: ig.Emit (OpCodes.Conv_U2); break;
3195 case Mode.I1_U4: ig.Emit (OpCodes.Conv_U4); break;
3196 case Mode.I1_U8: ig.Emit (OpCodes.Conv_I8); break;
3197 case Mode.I1_CH: ig.Emit (OpCodes.Conv_U2); break;
3199 case Mode.U1_I1: ig.Emit (OpCodes.Conv_I1); break;
3200 case Mode.U1_CH: ig.Emit (OpCodes.Conv_U2); break;
3202 case Mode.I2_I1: ig.Emit (OpCodes.Conv_I1); break;
3203 case Mode.I2_U1: ig.Emit (OpCodes.Conv_U1); break;
3204 case Mode.I2_U2: ig.Emit (OpCodes.Conv_U2); break;
3205 case Mode.I2_U4: ig.Emit (OpCodes.Conv_U4); break;
3206 case Mode.I2_U8: ig.Emit (OpCodes.Conv_I8); break;
3207 case Mode.I2_CH: ig.Emit (OpCodes.Conv_U2); break;
3209 case Mode.U2_I1: ig.Emit (OpCodes.Conv_I1); break;
3210 case Mode.U2_U1: ig.Emit (OpCodes.Conv_U1); break;
3211 case Mode.U2_I2: ig.Emit (OpCodes.Conv_I2); break;
3212 case Mode.U2_CH: /* nothing */ break;
3214 case Mode.I4_I1: ig.Emit (OpCodes.Conv_I1); break;
3215 case Mode.I4_U1: ig.Emit (OpCodes.Conv_U1); break;
3216 case Mode.I4_I2: ig.Emit (OpCodes.Conv_I2); break;
3217 case Mode.I4_U4: /* nothing */ break;
3218 case Mode.I4_U2: ig.Emit (OpCodes.Conv_U2); break;
3219 case Mode.I4_U8: ig.Emit (OpCodes.Conv_I8); break;
3220 case Mode.I4_CH: ig.Emit (OpCodes.Conv_U2); break;
3222 case Mode.U4_I1: ig.Emit (OpCodes.Conv_I1); break;
3223 case Mode.U4_U1: ig.Emit (OpCodes.Conv_U1); break;
3224 case Mode.U4_I2: ig.Emit (OpCodes.Conv_I2); break;
3225 case Mode.U4_U2: ig.Emit (OpCodes.Conv_U2); break;
3226 case Mode.U4_I4: /* nothing */ break;
3227 case Mode.U4_CH: ig.Emit (OpCodes.Conv_U2); break;
3229 case Mode.I8_I1: ig.Emit (OpCodes.Conv_I1); break;
3230 case Mode.I8_U1: ig.Emit (OpCodes.Conv_U1); break;
3231 case Mode.I8_I2: ig.Emit (OpCodes.Conv_I2); break;
3232 case Mode.I8_U2: ig.Emit (OpCodes.Conv_U2); break;
3233 case Mode.I8_I4: ig.Emit (OpCodes.Conv_I4); break;
3234 case Mode.I8_U4: ig.Emit (OpCodes.Conv_U4); break;
3235 case Mode.I8_U8: /* nothing */ break;
3236 case Mode.I8_CH: ig.Emit (OpCodes.Conv_U2); break;
3238 case Mode.U8_I1: ig.Emit (OpCodes.Conv_I1); break;
3239 case Mode.U8_U1: ig.Emit (OpCodes.Conv_U1); break;
3240 case Mode.U8_I2: ig.Emit (OpCodes.Conv_I2); break;
3241 case Mode.U8_U2: ig.Emit (OpCodes.Conv_U2); break;
3242 case Mode.U8_I4: ig.Emit (OpCodes.Conv_I4); break;
3243 case Mode.U8_U4: ig.Emit (OpCodes.Conv_U4); break;
3244 case Mode.U8_I8: /* nothing */ break;
3245 case Mode.U8_CH: ig.Emit (OpCodes.Conv_U2); break;
3247 case Mode.CH_I1: ig.Emit (OpCodes.Conv_I1); break;
3248 case Mode.CH_U1: ig.Emit (OpCodes.Conv_U1); break;
3249 case Mode.CH_I2: ig.Emit (OpCodes.Conv_I2); break;
3251 case Mode.R4_I1: ig.Emit (OpCodes.Conv_I1); break;
3252 case Mode.R4_U1: ig.Emit (OpCodes.Conv_U1); break;
3253 case Mode.R4_I2: ig.Emit (OpCodes.Conv_I2); break;
3254 case Mode.R4_U2: ig.Emit (OpCodes.Conv_U2); break;
3255 case Mode.R4_I4: ig.Emit (OpCodes.Conv_I4); break;
3256 case Mode.R4_U4: ig.Emit (OpCodes.Conv_U4); break;
3257 case Mode.R4_I8: ig.Emit (OpCodes.Conv_I8); break;
3258 case Mode.R4_U8: ig.Emit (OpCodes.Conv_U8); break;
3259 case Mode.R4_CH: ig.Emit (OpCodes.Conv_U2); break;
3261 case Mode.R8_I1: ig.Emit (OpCodes.Conv_I1); break;
3262 case Mode.R8_U1: ig.Emit (OpCodes.Conv_U1); break;
3263 case Mode.R8_I2: ig.Emit (OpCodes.Conv_I2); break;
3264 case Mode.R8_U2: ig.Emit (OpCodes.Conv_U2); break;
3265 case Mode.R8_I4: ig.Emit (OpCodes.Conv_I4); break;
3266 case Mode.R8_U4: ig.Emit (OpCodes.Conv_U4); break;
3267 case Mode.R8_I8: ig.Emit (OpCodes.Conv_I8); break;
3268 case Mode.R8_U8: ig.Emit (OpCodes.Conv_U8); break;
3269 case Mode.R8_CH: ig.Emit (OpCodes.Conv_U2); break;
3270 case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
3276 public class OpcodeCast : EmptyCast {
3280 public OpcodeCast (Expression child, Type return_type, OpCode op)
3281 : base (child, return_type)
3285 second_valid = false;
3288 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
3289 : base (child, return_type)
3294 second_valid = true;
3297 public override Expression DoResolve (EmitContext ec)
3299 // This should never be invoked, we are born in fully
3300 // initialized state.
3305 public override void Emit (EmitContext ec)
3316 /// This kind of cast is used to encapsulate a child and cast it
3317 /// to the class requested
3319 public class ClassCast : EmptyCast {
3320 public ClassCast (Expression child, Type return_type)
3321 : base (child, return_type)
3326 public override Expression DoResolve (EmitContext ec)
3328 // This should never be invoked, we are born in fully
3329 // initialized state.
3334 public override void Emit (EmitContext ec)
3338 ec.ig.Emit (OpCodes.Castclass, type);
3344 /// SimpleName expressions are initially formed of a single
3345 /// word and it only happens at the beginning of the expression.
3349 /// The expression will try to be bound to a Field, a Method
3350 /// group or a Property. If those fail we pass the name to our
3351 /// caller and the SimpleName is compounded to perform a type
3352 /// lookup. The idea behind this process is that we want to avoid
3353 /// creating a namespace map from the assemblies, as that requires
3354 /// the GetExportedTypes function to be called and a hashtable to
3355 /// be constructed which reduces startup time. If later we find
3356 /// that this is slower, we should create a `NamespaceExpr' expression
3357 /// that fully participates in the resolution process.
3359 /// For example `System.Console.WriteLine' is decomposed into
3360 /// MemberAccess (MemberAccess (SimpleName ("System"), "Console"), "WriteLine")
3362 /// The first SimpleName wont produce a match on its own, so it will
3364 /// MemberAccess (SimpleName ("System.Console"), "WriteLine").
3366 /// System.Console will produce a TypeExpr match.
3368 /// The downside of this is that we might be hitting `LookupType' too many
3369 /// times with this scheme.
3371 public class SimpleName : Expression, ITypeExpression {
3372 public readonly string Name;
3374 public SimpleName (string name, Location l)
3380 public static void Error_ObjectRefRequired (EmitContext ec, Location l, string name)
3382 if (ec.IsFieldInitializer)
3385 "A field initializer cannot reference the non-static field, " +
3386 "method or property `"+name+"'");
3390 "An object reference is required " +
3391 "for the non-static field `"+name+"'");
3395 // Checks whether we are trying to access an instance
3396 // property, method or field from a static body.
3398 Expression MemberStaticCheck (EmitContext ec, Expression e)
3400 if (e is IMemberExpr){
3401 IMemberExpr member = (IMemberExpr) e;
3403 if (!member.IsStatic){
3404 Error_ObjectRefRequired (ec, loc, Name);
3412 public override Expression DoResolve (EmitContext ec)
3414 return SimpleNameResolve (ec, null, false);
3417 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
3419 return SimpleNameResolve (ec, right_side, false);
3423 public Expression DoResolveAllowStatic (EmitContext ec)
3425 return SimpleNameResolve (ec, null, true);
3428 public Expression DoResolveType (EmitContext ec)
3431 // Stage 3: Lookup symbol in the various namespaces.
3433 DeclSpace ds = ec.DeclSpace;
3437 if (ec.ResolvingTypeTree){
3438 int errors = Report.Errors;
3439 Type dt = ec.DeclSpace.FindType (loc, Name);
3440 if (Report.Errors != errors)
3444 return new TypeExpr (dt, loc);
3447 if ((t = RootContext.LookupType (ds, Name, true, loc)) != null)
3448 return new TypeExpr (t, loc);
3452 // Stage 2 part b: Lookup up if we are an alias to a type
3455 // Since we are cheating: we only do the Alias lookup for
3456 // namespaces if the name does not include any dots in it
3459 alias_value = ec.DeclSpace.LookupAlias (Name);
3461 if (Name.IndexOf ('.') == -1 && alias_value != null) {
3462 if ((t = RootContext.LookupType (ds, alias_value, true, loc)) != null)
3463 return new TypeExpr (t, loc);
3465 // we have alias value, but it isn't Type, so try if it's namespace
3466 return new SimpleName (alias_value, loc);
3469 // No match, maybe our parent can compose us
3470 // into something meaningful.
3475 /// 7.5.2: Simple Names.
3477 /// Local Variables and Parameters are handled at
3478 /// parse time, so they never occur as SimpleNames.
3480 /// The `allow_static' flag is used by MemberAccess only
3481 /// and it is used to inform us that it is ok for us to
3482 /// avoid the static check, because MemberAccess might end
3483 /// up resolving the Name as a Type name and the access as
3484 /// a static type access.
3486 /// ie: Type Type; .... { Type.GetType (""); }
3488 /// Type is both an instance variable and a Type; Type.GetType
3489 /// is the static method not an instance method of type.
3491 Expression SimpleNameResolve (EmitContext ec, Expression right_side, bool allow_static)
3493 Expression e = null;
3496 // Stage 1: Performed by the parser (binding to locals or parameters).
3498 Block current_block = ec.CurrentBlock;
3499 if (current_block != null && current_block.IsVariableDefined (Name)){
3500 LocalVariableReference var;
3502 var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
3504 if (right_side != null)
3505 return var.ResolveLValue (ec, right_side);
3507 return var.Resolve (ec);
3510 if (current_block != null){
3512 Parameter par = null;
3513 Parameters pars = current_block.Parameters;
3515 par = pars.GetParameterByName (Name, out idx);
3518 ParameterReference param;
3520 param = new ParameterReference (pars, idx, Name, loc);
3522 if (right_side != null)
3523 return param.ResolveLValue (ec, right_side);
3525 return param.Resolve (ec);
3530 // Stage 2: Lookup members
3534 // For enums, the TypeBuilder is not ec.DeclSpace.TypeBuilder
3535 // Hence we have two different cases
3538 DeclSpace lookup_ds = ec.DeclSpace;
3540 if (lookup_ds.TypeBuilder == null)
3543 e = MemberLookup (ec, lookup_ds.TypeBuilder, Name, loc);
3548 // Classes/structs keep looking, enums break
3550 if (lookup_ds is TypeContainer)
3551 lookup_ds = ((TypeContainer) lookup_ds).Parent;
3554 } while (lookup_ds != null);
3556 if (e == null && ec.ContainerType != null)
3557 e = MemberLookup (ec, ec.ContainerType, Name, loc);
3560 return DoResolveType (ec);
3565 if (e is IMemberExpr) {
3566 e = MemberAccess.ResolveMemberAccess (ec, e, null, loc, this);
3570 IMemberExpr me = e as IMemberExpr;
3574 // This fails if ResolveMemberAccess() was unable to decide whether
3575 // it's a field or a type of the same name.
3576 if (!me.IsStatic && (me.InstanceExpression == null))
3580 TypeManager.IsNestedChildOf (me.InstanceExpression.Type, me.DeclaringType)) {
3581 Error (38, "Cannot access nonstatic member `" + me.Name + "' of " +
3582 "outer type `" + me.DeclaringType + "' via nested type `" +
3583 me.InstanceExpression.Type + "'");
3587 if (right_side != null)
3588 e = e.DoResolveLValue (ec, right_side);
3590 e = e.DoResolve (ec);
3595 if (ec.IsStatic || ec.IsFieldInitializer){
3599 return MemberStaticCheck (ec, e);
3604 public override void Emit (EmitContext ec)
3607 // If this is ever reached, then we failed to
3608 // find the name as a namespace
3611 Error (103, "The name `" + Name +
3612 "' does not exist in the class `" +
3613 ec.DeclSpace.Name + "'");
3616 public override string ToString ()
3623 /// Fully resolved expression that evaluates to a type
3625 public class TypeExpr : Expression, ITypeExpression {
3626 public TypeExpr (Type t, Location l)
3629 eclass = ExprClass.Type;
3633 public virtual Expression DoResolveType (EmitContext ec)
3638 override public Expression DoResolve (EmitContext ec)
3643 override public void Emit (EmitContext ec)
3645 throw new Exception ("Should never be called");
3648 public override string ToString ()
3650 return Type.ToString ();
3655 /// Used to create types from a fully qualified name. These are just used
3656 /// by the parser to setup the core types. A TypeLookupExpression is always
3657 /// classified as a type.
3659 public class TypeLookupExpression : TypeExpr {
3662 public TypeLookupExpression (string name) : base (null, Location.Null)
3667 public override Expression DoResolveType (EmitContext ec)
3670 type = RootContext.LookupType (ec.DeclSpace, name, false, Location.Null);
3674 public override Expression DoResolve (EmitContext ec)
3676 return DoResolveType (ec);
3679 public override void Emit (EmitContext ec)
3681 throw new Exception ("Should never be called");
3684 public override string ToString ()
3691 /// MethodGroup Expression.
3693 /// This is a fully resolved expression that evaluates to a type
3695 public class MethodGroupExpr : Expression, IMemberExpr {
3696 public MethodBase [] Methods;
3697 Expression instance_expression = null;
3698 bool is_explicit_impl = false;
3700 public MethodGroupExpr (MemberInfo [] mi, Location l)
3702 Methods = new MethodBase [mi.Length];
3703 mi.CopyTo (Methods, 0);
3704 eclass = ExprClass.MethodGroup;
3705 type = TypeManager.object_type;
3709 public MethodGroupExpr (ArrayList list, Location l)
3711 Methods = new MethodBase [list.Count];
3714 list.CopyTo (Methods, 0);
3716 foreach (MemberInfo m in list){
3717 if (!(m is MethodBase)){
3718 Console.WriteLine ("Name " + m.Name);
3719 Console.WriteLine ("Found a: " + m.GetType ().FullName);
3725 eclass = ExprClass.MethodGroup;
3726 type = TypeManager.object_type;
3729 public Type DeclaringType {
3731 return Methods [0].DeclaringType;
3736 // `A method group may have associated an instance expression'
3738 public Expression InstanceExpression {
3740 return instance_expression;
3744 instance_expression = value;
3748 public bool IsExplicitImpl {
3750 return is_explicit_impl;
3754 is_explicit_impl = value;
3758 public string Name {
3760 return Methods [0].Name;
3764 public bool IsInstance {
3766 foreach (MethodBase mb in Methods)
3774 public bool IsStatic {
3776 foreach (MethodBase mb in Methods)
3784 override public Expression DoResolve (EmitContext ec)
3786 if (instance_expression != null) {
3787 instance_expression = instance_expression.DoResolve (ec);
3788 if (instance_expression == null)
3795 public void ReportUsageError ()
3797 Report.Error (654, loc, "Method `" + Methods [0].DeclaringType + "." +
3798 Methods [0].Name + "()' is referenced without parentheses");
3801 override public void Emit (EmitContext ec)
3803 ReportUsageError ();
3806 bool RemoveMethods (bool keep_static)
3808 ArrayList smethods = new ArrayList ();
3810 foreach (MethodBase mb in Methods){
3811 if (mb.IsStatic == keep_static)
3815 if (smethods.Count == 0)
3818 Methods = new MethodBase [smethods.Count];
3819 smethods.CopyTo (Methods, 0);
3825 /// Removes any instance methods from the MethodGroup, returns
3826 /// false if the resulting set is empty.
3828 public bool RemoveInstanceMethods ()
3830 return RemoveMethods (true);
3834 /// Removes any static methods from the MethodGroup, returns
3835 /// false if the resulting set is empty.
3837 public bool RemoveStaticMethods ()
3839 return RemoveMethods (false);
3844 /// Fully resolved expression that evaluates to a Field
3846 public class FieldExpr : Expression, IAssignMethod, IMemoryLocation, IMemberExpr {
3847 public readonly FieldInfo FieldInfo;
3848 Expression instance_expr;
3850 public FieldExpr (FieldInfo fi, Location l)
3853 eclass = ExprClass.Variable;
3854 type = fi.FieldType;
3858 public string Name {
3860 return FieldInfo.Name;
3864 public bool IsInstance {
3866 return !FieldInfo.IsStatic;
3870 public bool IsStatic {
3872 return FieldInfo.IsStatic;
3876 public Type DeclaringType {
3878 return FieldInfo.DeclaringType;
3882 public Expression InstanceExpression {
3884 return instance_expr;
3888 instance_expr = value;
3892 override public Expression DoResolve (EmitContext ec)
3894 if (!FieldInfo.IsStatic){
3895 if (instance_expr == null){
3896 throw new Exception ("non-static FieldExpr without instance var\n" +
3897 "You have to assign the Instance variable\n" +
3898 "Of the FieldExpr to set this\n");
3901 // Resolve the field's instance expression while flow analysis is turned
3902 // off: when accessing a field "a.b", we must check whether the field
3903 // "a.b" is initialized, not whether the whole struct "a" is initialized.
3904 instance_expr = instance_expr.Resolve (ec, ResolveFlags.VariableOrValue |
3905 ResolveFlags.DisableFlowAnalysis);
3906 if (instance_expr == null)
3910 // If the instance expression is a local variable or parameter.
3911 IVariable var = instance_expr as IVariable;
3912 if ((var != null) && !var.IsFieldAssigned (ec, FieldInfo.Name, loc))
3918 void Report_AssignToReadonly (bool is_instance)
3923 msg = "Readonly field can not be assigned outside " +
3924 "of constructor or variable initializer";
3926 msg = "A static readonly field can only be assigned in " +
3927 "a static constructor";
3929 Report.Error (is_instance ? 191 : 198, loc, msg);
3932 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
3934 IVariable var = instance_expr as IVariable;
3936 var.SetFieldAssigned (ec, FieldInfo.Name);
3938 Expression e = DoResolve (ec);
3943 if (!FieldInfo.IsInitOnly)
3947 // InitOnly fields can only be assigned in constructors
3950 if (ec.IsConstructor)
3953 Report_AssignToReadonly (true);
3958 override public void Emit (EmitContext ec)
3960 ILGenerator ig = ec.ig;
3961 bool is_volatile = false;
3963 if (FieldInfo is FieldBuilder){
3964 FieldBase f = TypeManager.GetField (FieldInfo);
3966 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
3969 f.status |= Field.Status.USED;
3972 if (FieldInfo.IsStatic){
3974 ig.Emit (OpCodes.Volatile);
3976 ig.Emit (OpCodes.Ldsfld, FieldInfo);
3978 if (instance_expr.Type.IsValueType){
3980 LocalTemporary tempo = null;
3982 if (!(instance_expr is IMemoryLocation)){
3983 tempo = new LocalTemporary (
3984 ec, instance_expr.Type);
3986 InstanceExpression.Emit (ec);
3990 ml = (IMemoryLocation) instance_expr;
3992 ml.AddressOf (ec, AddressOp.Load);
3994 instance_expr.Emit (ec);
3997 ig.Emit (OpCodes.Volatile);
3999 ig.Emit (OpCodes.Ldfld, FieldInfo);
4003 public void EmitAssign (EmitContext ec, Expression source)
4005 FieldAttributes fa = FieldInfo.Attributes;
4006 bool is_static = (fa & FieldAttributes.Static) != 0;
4007 bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
4008 ILGenerator ig = ec.ig;
4010 if (is_readonly && !ec.IsConstructor){
4011 Report_AssignToReadonly (!is_static);
4016 Expression instance = instance_expr;
4018 if (instance.Type.IsValueType){
4019 if (instance is IMemoryLocation){
4020 IMemoryLocation ml = (IMemoryLocation) instance;
4022 ml.AddressOf (ec, AddressOp.Store);
4024 throw new Exception ("The " + instance + " of type " +
4026 " represents a ValueType and does " +
4027 "not implement IMemoryLocation");
4033 if (FieldInfo is FieldBuilder){
4034 FieldBase f = TypeManager.GetField (FieldInfo);
4036 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
4037 ig.Emit (OpCodes.Volatile);
4041 ig.Emit (OpCodes.Stsfld, FieldInfo);
4043 ig.Emit (OpCodes.Stfld, FieldInfo);
4045 if (FieldInfo is FieldBuilder){
4046 FieldBase f = TypeManager.GetField (FieldInfo);
4048 f.status |= Field.Status.ASSIGNED;
4052 public void AddressOf (EmitContext ec, AddressOp mode)
4054 ILGenerator ig = ec.ig;
4056 if (FieldInfo is FieldBuilder){
4057 FieldBase f = TypeManager.GetField (FieldInfo);
4058 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
4059 ig.Emit (OpCodes.Volatile);
4062 if (FieldInfo is FieldBuilder){
4063 FieldBase f = TypeManager.GetField (FieldInfo);
4065 if ((mode & AddressOp.Store) != 0)
4066 f.status |= Field.Status.ASSIGNED;
4067 if ((mode & AddressOp.Load) != 0)
4068 f.status |= Field.Status.USED;
4072 // Handle initonly fields specially: make a copy and then
4073 // get the address of the copy.
4075 if (FieldInfo.IsInitOnly && !ec.IsConstructor){
4079 local = ig.DeclareLocal (type);
4080 ig.Emit (OpCodes.Stloc, local);
4081 ig.Emit (OpCodes.Ldloca, local);
4085 if (FieldInfo.IsStatic)
4086 ig.Emit (OpCodes.Ldsflda, FieldInfo);
4088 if (instance_expr is IMemoryLocation)
4089 ((IMemoryLocation)instance_expr).AddressOf (ec, AddressOp.LoadStore);
4091 instance_expr.Emit (ec);
4092 ig.Emit (OpCodes.Ldflda, FieldInfo);
4098 /// Expression that evaluates to a Property. The Assign class
4099 /// might set the `Value' expression if we are in an assignment.
4101 /// This is not an LValue because we need to re-write the expression, we
4102 /// can not take data from the stack and store it.
4104 public class PropertyExpr : ExpressionStatement, IAssignMethod, IMemberExpr {
4105 public readonly PropertyInfo PropertyInfo;
4107 MethodInfo getter, setter;
4110 Expression instance_expr;
4112 public PropertyExpr (EmitContext ec, PropertyInfo pi, Location l)
4115 eclass = ExprClass.PropertyAccess;
4119 type = TypeManager.TypeToCoreType (pi.PropertyType);
4121 ResolveAccessors (ec);
4124 public string Name {
4126 return PropertyInfo.Name;
4130 public bool IsInstance {
4136 public bool IsStatic {
4142 public Type DeclaringType {
4144 return PropertyInfo.DeclaringType;
4149 // The instance expression associated with this expression
4151 public Expression InstanceExpression {
4153 instance_expr = value;
4157 return instance_expr;
4161 public bool VerifyAssignable ()
4163 if (!PropertyInfo.CanWrite){
4164 Report.Error (200, loc,
4165 "The property `" + PropertyInfo.Name +
4166 "' can not be assigned to, as it has not set accessor");
4173 void ResolveAccessors (EmitContext ec)
4175 BindingFlags flags = BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance;
4176 MemberInfo [] group;
4178 group = TypeManager.MemberLookup (ec.ContainerType, PropertyInfo.DeclaringType,
4179 MemberTypes.Method, flags, "get_" + PropertyInfo.Name);
4182 // The first method is the closest to us
4184 if (group != null && group.Length > 0){
4185 getter = (MethodInfo) group [0];
4187 if (getter.IsStatic)
4192 // The first method is the closest to us
4194 group = TypeManager.MemberLookup (ec.ContainerType, PropertyInfo.DeclaringType,
4195 MemberTypes.Method, flags, "set_" + PropertyInfo.Name);
4196 if (group != null && group.Length > 0){
4197 setter = (MethodInfo) group [0];
4198 if (setter.IsStatic)
4203 override public Expression DoResolve (EmitContext ec)
4205 if (getter == null){
4206 Report.Error (154, loc,
4207 "The property `" + PropertyInfo.Name +
4208 "' can not be used in " +
4209 "this context because it lacks a get accessor");
4213 if ((instance_expr == null) && ec.IsStatic && !is_static) {
4214 SimpleName.Error_ObjectRefRequired (ec, loc, PropertyInfo.Name);
4218 if (instance_expr != null) {
4219 instance_expr = instance_expr.DoResolve (ec);
4220 if (instance_expr == null)
4227 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
4229 if (setter == null){
4230 Report.Error (154, loc,
4231 "The property `" + PropertyInfo.Name +
4232 "' can not be used in " +
4233 "this context because it lacks a set accessor");
4237 if (instance_expr != null) {
4238 instance_expr = instance_expr.DoResolve (ec);
4239 if (instance_expr == null)
4246 override public void Emit (EmitContext ec)
4249 // Special case: length of single dimension array property is turned into ldlen
4251 if ((getter == TypeManager.system_int_array_get_length) ||
4252 (getter == TypeManager.int_array_get_length)){
4253 Type iet = instance_expr.Type;
4256 // System.Array.Length can be called, but the Type does not
4257 // support invoking GetArrayRank, so test for that case first
4259 if (iet != TypeManager.array_type && (iet.GetArrayRank () == 1)){
4260 instance_expr.Emit (ec);
4261 ec.ig.Emit (OpCodes.Ldlen);
4266 Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, getter, null, loc);
4271 // Implements the IAssignMethod interface for assignments
4273 public void EmitAssign (EmitContext ec, Expression source)
4275 Argument arg = new Argument (source, Argument.AType.Expression);
4276 ArrayList args = new ArrayList ();
4279 Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, setter, args, loc);
4282 override public void EmitStatement (EmitContext ec)
4285 ec.ig.Emit (OpCodes.Pop);
4290 /// Fully resolved expression that evaluates to an Event
4292 public class EventExpr : Expression, IMemberExpr {
4293 public readonly EventInfo EventInfo;
4294 public Expression instance_expr;
4297 MethodInfo add_accessor, remove_accessor;
4299 public EventExpr (EventInfo ei, Location loc)
4303 eclass = ExprClass.EventAccess;
4305 add_accessor = TypeManager.GetAddMethod (ei);
4306 remove_accessor = TypeManager.GetRemoveMethod (ei);
4308 if (add_accessor.IsStatic || remove_accessor.IsStatic)
4311 if (EventInfo is MyEventBuilder)
4312 type = ((MyEventBuilder) EventInfo).EventType;
4314 type = EventInfo.EventHandlerType;
4317 public string Name {
4319 return EventInfo.Name;
4323 public bool IsInstance {
4329 public bool IsStatic {
4335 public Type DeclaringType {
4337 return EventInfo.DeclaringType;
4341 public Expression InstanceExpression {
4343 return instance_expr;
4347 instance_expr = value;
4351 public override Expression DoResolve (EmitContext ec)
4353 if (instance_expr != null) {
4354 instance_expr = instance_expr.DoResolve (ec);
4355 if (instance_expr == null)
4362 public override void Emit (EmitContext ec)
4364 Report.Error (70, loc, "The event `" + Name + "' can only appear on the left hand side of += or -= (except on the defining type)");
4367 public void EmitAddOrRemove (EmitContext ec, Expression source)
4369 Expression handler = ((Binary) source).Right;
4371 Argument arg = new Argument (handler, Argument.AType.Expression);
4372 ArrayList args = new ArrayList ();
4376 if (((Binary) source).Oper == Binary.Operator.Addition)
4377 Invocation.EmitCall (
4378 ec, false, IsStatic, instance_expr, add_accessor, args, loc);
4380 Invocation.EmitCall (
4381 ec, false, IsStatic, instance_expr, remove_accessor, args, loc);