2 // expression.cs: Expression representation for the IL tree.
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001 Ximian, Inc.
11 // Maybe we should make Resolve be an instance method that just calls
12 // the virtual DoResolve function and checks conditions like the eclass
13 // and type being set if a non-null value is returned. For robustness
19 using System.Collections;
20 using System.Diagnostics;
21 using System.Reflection;
22 using System.Reflection.Emit;
26 // The ExprClass class contains the is used to pass the
27 // classification of an expression (value, variable, namespace,
28 // type, method group, property access, event access, indexer access,
31 public enum ExprClass {
35 Variable, // Every Variable should implement LValue
46 // Base class for expressions
48 public abstract class Expression {
49 protected ExprClass eclass;
62 public ExprClass ExprClass {
73 // Utility wrapper routine for Error, just to beautify the code
75 static protected void Error (TypeContainer tc, int error, string s)
77 Report.Error (error, s);
80 static protected void Error (TypeContainer tc, int error, Location l, string s)
82 Report.Error (error, l, s);
86 // Utility wrapper routine for Warning, just to beautify the code
88 static protected void Warning (TypeContainer tc, int warning, string s)
90 Report.Warning (warning, s);
94 // Performs semantic analysis on the Expression
98 // The Resolve method is invoked to perform the semantic analysis
101 // The return value is an expression (it can be the
102 // same expression in some cases) or a new
103 // expression that better represents this node.
105 // For example, optimizations of Unary (LiteralInt)
106 // would return a new LiteralInt with a negated
109 // If there is an error during semantic analysis,
110 // then an error should
111 // be reported (using TypeContainer.RootContext.Report) and a null
112 // value should be returned.
114 // There are two side effects expected from calling
115 // Resolve(): the the field variable "eclass" should
116 // be set to any value of the enumeration
117 // `ExprClass' and the type variable should be set
118 // to a valid type (this is the type of the
122 public abstract Expression DoResolve (TypeContainer tc);
126 // Currently Resolve wraps DoResolve to perform sanity
127 // checking and assertion checking on what we expect from Resolve
130 public Expression Resolve (TypeContainer tc)
132 Expression e = DoResolve (tc);
135 if (e.ExprClass == ExprClass.Invalid)
136 throw new Exception ("Expression " + e +
137 " ExprClass is Invalid after resolve");
139 if (e.ExprClass != ExprClass.MethodGroup)
141 throw new Exception ("Expression " + e +
142 " did not set its type after Resolve");
149 // Emits the code for the expression
154 // The Emit method is invoked to generate the code
155 // for the expression.
158 public abstract void Emit (EmitContext ec);
161 // Protected constructor. Only derivate types should
162 // be able to be created
165 protected Expression ()
167 eclass = ExprClass.Invalid;
172 // Returns a literalized version of a literal FieldInfo
174 static Expression Literalize (FieldInfo fi)
176 Type t = fi.FieldType;
177 object v = fi.GetValue (fi);
179 if (t == TypeManager.int32_type)
180 return new IntLiteral ((int) v);
181 else if (t == TypeManager.uint32_type)
182 return new UIntLiteral ((uint) v);
183 else if (t == TypeManager.int64_type)
184 return new LongLiteral ((long) v);
185 else if (t == TypeManager.uint64_type)
186 return new ULongLiteral ((ulong) v);
187 else if (t == TypeManager.float_type)
188 return new FloatLiteral ((float) v);
189 else if (t == TypeManager.double_type)
190 return new DoubleLiteral ((double) v);
191 else if (t == TypeManager.string_type)
192 return new StringLiteral ((string) v);
193 else if (t == TypeManager.short_type)
194 return new IntLiteral ((int) ((short)v));
195 else if (t == TypeManager.ushort_type)
196 return new IntLiteral ((int) ((ushort)v));
197 else if (t == TypeManager.sbyte_type)
198 return new IntLiteral ((int) ((sbyte)v));
199 else if (t == TypeManager.byte_type)
200 return new IntLiteral ((int) ((byte)v));
201 else if (t == TypeManager.char_type)
202 return new IntLiteral ((int) ((char)v));
204 throw new Exception ("Unknown type for literal (" + v.GetType () +
205 "), details: " + fi);
209 // Returns a fully formed expression after a MemberLookup
211 static Expression ExprClassFromMemberInfo (TypeContainer tc, MemberInfo mi)
213 if (mi is EventInfo){
214 return new EventExpr ((EventInfo) mi);
215 } else if (mi is FieldInfo){
216 FieldInfo fi = (FieldInfo) mi;
219 Expression e = Literalize (fi);
224 return new FieldExpr (fi);
225 } else if (mi is PropertyInfo){
226 return new PropertyExpr ((PropertyInfo) mi);
227 } else if (mi is Type)
228 return new TypeExpr ((Type) mi);
234 // FIXME: Probably implement a cache for (t,name,current_access_set)?
236 // FIXME: We need to cope with access permissions here, or this wont
239 // This code could use some optimizations, but we need to do some
240 // measurements. For example, we could use a delegate to `flag' when
241 // something can not any longer be a method-group (because it is something
245 // If the return value is an Array, then it is an array of
248 // If the return value is an MemberInfo, it is anything, but a Method
252 // FIXME: When calling MemberLookup inside an `Invocation', we should pass
253 // the arguments here and have MemberLookup return only the methods that
254 // match the argument count/type, unlike we are doing now (we delay this
257 // This is so we can catch correctly attempts to invoke instance methods
258 // from a static body (scan for error 120 in ResolveSimpleName).
260 public static Expression MemberLookup (TypeContainer tc, Type t, string name,
261 bool same_type, MemberTypes mt, BindingFlags bf)
264 bf |= BindingFlags.NonPublic;
266 MemberInfo [] mi = tc.RootContext.TypeManager.FindMembers (
267 t, mt, bf, Type.FilterName, name);
272 // FIXME : How does this wierd case arise ?
276 if (mi.Length == 1 && !(mi [0] is MethodBase))
277 return Expression.ExprClassFromMemberInfo (tc, mi [0]);
279 for (int i = 0; i < mi.Length; i++)
280 if (!(mi [i] is MethodBase)){
282 -5, "Do not know how to reproduce this case: " +
283 "Methods and non-Method with the same name, " +
284 "report this please");
286 for (i = 0; i < mi.Length; i++){
287 Type tt = mi [i].GetType ();
289 Console.WriteLine (i + ": " + mi [i]);
290 while (tt != TypeManager.object_type){
291 Console.WriteLine (tt);
297 return new MethodGroupExpr (mi);
300 public const MemberTypes AllMemberTypes =
301 MemberTypes.Constructor |
305 MemberTypes.NestedType |
306 MemberTypes.Property;
308 public const BindingFlags AllBindingsFlags =
309 BindingFlags.Public |
310 BindingFlags.Static |
311 BindingFlags.Instance;
313 public static Expression MemberLookup (TypeContainer tc, Type t, string name,
316 return MemberLookup (tc, t, name, same_type, AllMemberTypes, AllBindingsFlags);
320 // I am in general unhappy with this implementation.
322 // I need to revise this.
324 static public Expression ResolveMemberAccess (TypeContainer tc, string name)
326 Expression left_e = null;
327 int dot_pos = name.LastIndexOf (".");
328 string left = name.Substring (0, dot_pos);
329 string right = name.Substring (dot_pos + 1);
332 if ((t = tc.LookupType (left, false)) != null){
335 left_e = new TypeExpr (t);
336 e = new MemberAccess (left_e, right);
337 return e.Resolve (tc);
343 // T.P Static property access (P) on Type T.
344 // e.P instance property access on instance e for P.
350 Error (tc, 246, "Can not find type or namespace `"+left+"'");
354 switch (left_e.ExprClass){
356 return MemberLookup (tc,
358 left_e.Type == tc.TypeBuilder);
360 case ExprClass.Namespace:
361 case ExprClass.PropertyAccess:
362 case ExprClass.IndexerAccess:
363 case ExprClass.Variable:
364 case ExprClass.Value:
365 case ExprClass.Nothing:
366 case ExprClass.EventAccess:
367 case ExprClass.MethodGroup:
368 case ExprClass.Invalid:
369 throw new Exception ("Should have got the " + left_e.ExprClass +
376 static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
378 Type expr_type = expr.Type;
380 if (target_type == TypeManager.object_type) {
381 if (expr_type.IsClass)
382 return new EmptyCast (expr, target_type);
383 if (expr_type.IsValueType)
384 return new BoxedCast (expr);
385 } else if (expr_type.IsSubclassOf (target_type)) {
386 return new EmptyCast (expr, target_type);
388 // from any class-type S to any interface-type T.
389 if (expr_type.IsClass && target_type.IsInterface) {
390 Type [] interfaces = expr_type.FindInterfaces (Module.FilterTypeName,
391 target_type.FullName);
392 if (interfaces != null)
393 return new EmptyCast (expr, target_type);
396 // from any interface type S to interface-type T.
397 // FIXME : Is it right to use IsAssignableFrom ?
398 if (expr_type.IsInterface && target_type.IsInterface)
399 if (target_type.IsAssignableFrom (expr_type))
400 return new EmptyCast (expr, target_type);
403 // from an array-type S to an array-type of type T
404 if (expr_type.IsArray && target_type.IsArray) {
406 throw new Exception ("Implement array conversion");
410 // from an array-type to System.Array
411 if (expr_type.IsArray && target_type.IsAssignableFrom (expr_type))
412 return new EmptyCast (expr, target_type);
414 // from any delegate type to System.Delegate
415 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
416 target_type == TypeManager.delegate_type)
417 if (target_type.IsAssignableFrom (expr_type))
418 return new EmptyCast (expr, target_type);
420 // from any array-type or delegate type into System.ICloneable.
421 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
422 if (target_type == TypeManager.cloneable_interface)
423 throw new Exception ("Implement conversion to System.ICloneable");
425 // from the null type to any reference-type.
426 // FIXME : How do we do this ?
436 // Handles expressions like this: decimal d; d = 1;
437 // and changes them into: decimal d; d = new System.Decimal (1);
439 static Expression InternalTypeConstructor (TypeContainer tc, Expression expr, Type target)
441 ArrayList args = new ArrayList ();
443 args.Add (new Argument (expr, Argument.AType.Expression));
445 Expression ne = new New (target.FullName, args,
448 return ne.Resolve (tc);
452 // Implicit Numeric Conversions.
454 // expr is the expression to convert, returns a new expression of type
455 // target_type or null if an implicit conversion is not possible.
458 static public Expression ImplicitNumericConversion (TypeContainer tc, Expression expr,
459 Type target_type, Location l)
461 Type expr_type = expr.Type;
464 // Attempt to do the implicit constant expression conversions
466 if (expr is IntLiteral){
469 e = TryImplicitIntConversion (target_type, (IntLiteral) expr);
472 } else if (expr is LongLiteral){
474 // Try the implicit constant expression conversion
475 // from long to ulong, instead of a nice routine,
478 if (((LongLiteral) expr).Value > 0)
479 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
482 if (expr_type == TypeManager.sbyte_type){
484 // From sbyte to short, int, long, float, double.
486 if (target_type == TypeManager.int32_type)
487 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
488 if (target_type == TypeManager.int64_type)
489 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
490 if (target_type == TypeManager.double_type)
491 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
492 if (target_type == TypeManager.float_type)
493 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
494 if (target_type == TypeManager.short_type)
495 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
496 if (target_type == TypeManager.decimal_type)
497 return InternalTypeConstructor (tc, expr, target_type);
498 } else if (expr_type == TypeManager.byte_type){
500 // From byte to short, ushort, int, uint, long, ulong, float, double
502 if ((target_type == TypeManager.short_type) ||
503 (target_type == TypeManager.ushort_type) ||
504 (target_type == TypeManager.int32_type) ||
505 (target_type == TypeManager.uint32_type))
506 return new EmptyCast (expr, target_type);
508 if (target_type == TypeManager.uint64_type)
509 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
510 if (target_type == TypeManager.int64_type)
511 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
513 if (target_type == TypeManager.float_type)
514 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
515 if (target_type == TypeManager.double_type)
516 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
517 if (target_type == TypeManager.decimal_type)
518 return InternalTypeConstructor (tc, expr, target_type);
519 } else if (expr_type == TypeManager.short_type){
521 // From short to int, long, float, double
523 if (target_type == TypeManager.int32_type)
524 return new EmptyCast (expr, target_type);
525 if (target_type == TypeManager.int64_type)
526 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
527 if (target_type == TypeManager.double_type)
528 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
529 if (target_type == TypeManager.float_type)
530 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
531 if (target_type == TypeManager.decimal_type)
532 return InternalTypeConstructor (tc, expr, target_type);
533 } else if (expr_type == TypeManager.ushort_type){
535 // From ushort to int, uint, long, ulong, float, double
537 if (target_type == TypeManager.uint32_type)
538 return new EmptyCast (expr, target_type);
540 if (target_type == TypeManager.uint64_type)
541 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
542 if (target_type == TypeManager.int32_type)
543 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
544 if (target_type == TypeManager.int64_type)
545 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
546 if (target_type == TypeManager.double_type)
547 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
548 if (target_type == TypeManager.float_type)
549 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
550 if (target_type == TypeManager.decimal_type)
551 return InternalTypeConstructor (tc, expr, target_type);
552 } else if (expr_type == TypeManager.int32_type){
554 // From int to long, float, double
556 if (target_type == TypeManager.int64_type)
557 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
558 if (target_type == TypeManager.double_type)
559 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
560 if (target_type == TypeManager.float_type)
561 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
562 if (target_type == TypeManager.decimal_type)
563 return InternalTypeConstructor (tc, expr, target_type);
564 } else if (expr_type == TypeManager.uint32_type){
566 // From uint to long, ulong, float, double
568 if (target_type == TypeManager.int64_type)
569 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
570 if (target_type == TypeManager.uint64_type)
571 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
572 if (target_type == TypeManager.double_type)
573 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
575 if (target_type == TypeManager.float_type)
576 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
578 if (target_type == TypeManager.decimal_type)
579 return InternalTypeConstructor (tc, expr, target_type);
580 } else if ((expr_type == TypeManager.uint64_type) ||
581 (expr_type == TypeManager.int64_type)){
583 // From long/ulong to float, double
585 if (target_type == TypeManager.double_type)
586 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
588 if (target_type == TypeManager.float_type)
589 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
591 if (target_type == TypeManager.decimal_type)
592 return InternalTypeConstructor (tc, expr, target_type);
593 } else if (expr_type == TypeManager.char_type){
595 // From char to ushort, int, uint, long, ulong, float, double
597 if ((target_type == TypeManager.ushort_type) ||
598 (target_type == TypeManager.int32_type) ||
599 (target_type == TypeManager.uint32_type))
600 return new EmptyCast (expr, target_type);
601 if (target_type == TypeManager.uint64_type)
602 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
603 if (target_type == TypeManager.int64_type)
604 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
605 if (target_type == TypeManager.float_type)
606 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
607 if (target_type == TypeManager.double_type)
608 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
609 if (target_type == TypeManager.decimal_type)
610 return InternalTypeConstructor (tc, expr, target_type);
611 } else if (expr_type == TypeManager.float_type){
615 if (target_type == TypeManager.double_type)
616 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
623 // Determines if a standard implicit conversion exists from
624 // expr_type to target_type
626 static bool StandardConversionExists (Type expr_type, Type target_type)
628 if (expr_type == target_type)
631 // First numeric conversions
633 if (expr_type == TypeManager.sbyte_type){
635 // From sbyte to short, int, long, float, double.
637 if ((target_type == TypeManager.int32_type) ||
638 (target_type == TypeManager.int64_type) ||
639 (target_type == TypeManager.double_type) ||
640 (target_type == TypeManager.float_type) ||
641 (target_type == TypeManager.short_type) ||
642 (target_type == TypeManager.decimal_type))
645 } else if (expr_type == TypeManager.byte_type){
647 // From byte to short, ushort, int, uint, long, ulong, float, double
649 if ((target_type == TypeManager.short_type) ||
650 (target_type == TypeManager.ushort_type) ||
651 (target_type == TypeManager.int32_type) ||
652 (target_type == TypeManager.uint32_type) ||
653 (target_type == TypeManager.uint64_type) ||
654 (target_type == TypeManager.int64_type) ||
655 (target_type == TypeManager.float_type) ||
656 (target_type == TypeManager.double_type) ||
657 (target_type == TypeManager.decimal_type))
660 } else if (expr_type == TypeManager.short_type){
662 // From short to int, long, float, double
664 if ((target_type == TypeManager.int32_type) ||
665 (target_type == TypeManager.int64_type) ||
666 (target_type == TypeManager.double_type) ||
667 (target_type == TypeManager.float_type) ||
668 (target_type == TypeManager.decimal_type))
671 } else if (expr_type == TypeManager.ushort_type){
673 // From ushort to int, uint, long, ulong, float, double
675 if ((target_type == TypeManager.uint32_type) ||
676 (target_type == TypeManager.uint64_type) ||
677 (target_type == TypeManager.int32_type) ||
678 (target_type == TypeManager.int64_type) ||
679 (target_type == TypeManager.double_type) ||
680 (target_type == TypeManager.float_type) ||
681 (target_type == TypeManager.decimal_type))
684 } else if (expr_type == TypeManager.int32_type){
686 // From int to long, float, double
688 if ((target_type == TypeManager.int64_type) ||
689 (target_type == TypeManager.double_type) ||
690 (target_type == TypeManager.float_type) ||
691 (target_type == TypeManager.decimal_type))
694 } else if (expr_type == TypeManager.uint32_type){
696 // From uint to long, ulong, float, double
698 if ((target_type == TypeManager.int64_type) ||
699 (target_type == TypeManager.uint64_type) ||
700 (target_type == TypeManager.double_type) ||
701 (target_type == TypeManager.float_type) ||
702 (target_type == TypeManager.decimal_type))
705 } else if ((expr_type == TypeManager.uint64_type) ||
706 (expr_type == TypeManager.int64_type)) {
708 // From long/ulong to float, double
710 if ((target_type == TypeManager.double_type) ||
711 (target_type == TypeManager.float_type) ||
712 (target_type == TypeManager.decimal_type))
715 } else if (expr_type == TypeManager.char_type){
717 // From char to ushort, int, uint, long, ulong, float, double
719 if ((target_type == TypeManager.ushort_type) ||
720 (target_type == TypeManager.int32_type) ||
721 (target_type == TypeManager.uint32_type) ||
722 (target_type == TypeManager.uint64_type) ||
723 (target_type == TypeManager.int64_type) ||
724 (target_type == TypeManager.float_type) ||
725 (target_type == TypeManager.double_type) ||
726 (target_type == TypeManager.decimal_type))
729 } else if (expr_type == TypeManager.float_type){
733 if (target_type == TypeManager.double_type)
737 // Next reference conversions
739 if (target_type == TypeManager.object_type) {
740 if ((expr_type.IsClass) ||
741 (expr_type.IsValueType))
744 } else if (expr_type.IsSubclassOf (target_type)) {
748 // from any class-type S to any interface-type T.
749 if (expr_type.IsClass && target_type.IsInterface)
752 // from any interface type S to interface-type T.
753 // FIXME : Is it right to use IsAssignableFrom ?
754 if (expr_type.IsInterface && target_type.IsInterface)
755 if (target_type.IsAssignableFrom (expr_type))
758 // from an array-type S to an array-type of type T
759 if (expr_type.IsArray && target_type.IsArray)
762 // from an array-type to System.Array
763 if (expr_type.IsArray && target_type.IsAssignableFrom (expr_type))
766 // from any delegate type to System.Delegate
767 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
768 target_type == TypeManager.delegate_type)
769 if (target_type.IsAssignableFrom (expr_type))
772 // from any array-type or delegate type into System.ICloneable.
773 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
774 if (target_type == TypeManager.cloneable_interface)
777 // from the null type to any reference-type.
778 // FIXME : How do we do this ?
786 // Finds "most encompassed type" according to the spec (13.4.2)
787 // amongst the methods in the MethodGroupExpr which convert from a
788 // type encompassing source_type
790 static Type FindMostEncompassedType (TypeContainer tc, MethodGroupExpr me, Type source_type)
794 for (int i = me.Methods.Length; i > 0; ) {
797 MethodBase mb = me.Methods [i];
798 ParameterData pd = Invocation.GetParameterData (mb);
799 Type param_type = pd.ParameterType (0);
801 if (StandardConversionExists (source_type, param_type)) {
805 if (StandardConversionExists (param_type, best))
814 // Finds "most encompassing type" according to the spec (13.4.2)
815 // amongst the methods in the MethodGroupExpr which convert to a
816 // type encompassed by target_type
818 static Type FindMostEncompassingType (TypeContainer tc, MethodGroupExpr me, Type target)
822 for (int i = me.Methods.Length; i > 0; ) {
825 MethodInfo mi = (MethodInfo) me.Methods [i];
826 Type ret_type = mi.ReturnType;
828 if (StandardConversionExists (ret_type, target)) {
832 if (!StandardConversionExists (ret_type, best))
844 // User-defined Implicit conversions
846 static public Expression ImplicitUserConversion (TypeContainer tc, Expression source, Type target,
849 return UserDefinedConversion (tc, source, target, l, false);
853 // User-defined Explicit conversions
855 static public Expression ExplicitUserConversion (TypeContainer tc, Expression source, Type target,
858 return UserDefinedConversion (tc, source, target, l, true);
862 // User-defined conversions
864 static public Expression UserDefinedConversion (TypeContainer tc, Expression source,
865 Type target, Location l, bool look_for_explicit)
867 Expression mg1 = null, mg2 = null, mg3 = null, mg4 = null;
868 Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
869 MethodBase method = null;
870 Type source_type = source.Type;
874 // If we have a boolean type, we need to check for the True operator
876 // FIXME : How does the False operator come into the picture ?
877 // FIXME : This doesn't look complete and very correct !
878 if (target == TypeManager.bool_type)
881 op_name = "op_Implicit";
883 mg1 = MemberLookup (tc, source_type, op_name, false);
885 if (source_type.BaseType != null)
886 mg2 = MemberLookup (tc, source_type.BaseType, op_name, false);
888 mg3 = MemberLookup (tc, target, op_name, false);
890 if (target.BaseType != null)
891 mg4 = MemberLookup (tc, target.BaseType, op_name, false);
893 MethodGroupExpr union1 = Invocation.MakeUnionSet (mg1, mg2);
894 MethodGroupExpr union2 = Invocation.MakeUnionSet (mg3, mg4);
896 MethodGroupExpr union3 = Invocation.MakeUnionSet (union1, union2);
898 MethodGroupExpr union4 = null;
900 if (look_for_explicit) {
902 op_name = "op_Explicit";
904 mg5 = MemberLookup (tc, source_type, op_name, false);
906 if (source_type.BaseType != null)
907 mg6 = MemberLookup (tc, source_type.BaseType, op_name, false);
909 mg7 = MemberLookup (tc, target, op_name, false);
911 if (target.BaseType != null)
912 mg8 = MemberLookup (tc, target.BaseType, op_name, false);
914 MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6);
915 MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8);
917 union4 = Invocation.MakeUnionSet (union5, union6);
920 MethodGroupExpr union = Invocation.MakeUnionSet (union3, union4);
924 Type most_specific_source, most_specific_target;
926 most_specific_source = FindMostEncompassedType (tc, union, source_type);
927 if (most_specific_source == null)
930 most_specific_target = FindMostEncompassingType (tc, union, target);
931 if (most_specific_target == null)
936 for (int i = union.Methods.Length; i > 0;) {
939 MethodBase mb = union.Methods [i];
940 ParameterData pd = Invocation.GetParameterData (mb);
941 MethodInfo mi = (MethodInfo) union.Methods [i];
943 if (pd.ParameterType (0) == most_specific_source &&
944 mi.ReturnType == most_specific_target) {
950 if (method == null || count > 1) {
951 Report.Error (-11, l, "Ambiguous user defined conversion");
956 return new UserCast ((MethodInfo) method, source, most_specific_source,
957 most_specific_target, look_for_explicit);
965 // Converts implicitly the resolved expression `expr' into the
966 // `target_type'. It returns a new expression that can be used
967 // in a context that expects a `target_type'.
969 static public Expression ConvertImplicit (TypeContainer tc, Expression expr,
970 Type target_type, Location l)
972 Type expr_type = expr.Type;
975 if (expr_type == target_type)
978 e = ImplicitNumericConversion (tc, expr, target_type, l);
982 e = ImplicitReferenceConversion (expr, target_type);
986 e = ImplicitUserConversion (tc, expr, target_type, l);
990 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
991 IntLiteral i = (IntLiteral) expr;
994 return new EmptyCast (expr, target_type);
1002 // Attempts to apply the `Standard Implicit
1003 // Conversion' rules to the expression `expr' into
1004 // the `target_type'. It returns a new expression
1005 // that can be used in a context that expects a
1008 // This is different from `ConvertImplicit' in that the
1009 // user defined implicit conversions are excluded.
1011 static public Expression ConvertImplicitStandard (TypeContainer tc, Expression expr,
1012 Type target_type, Location l)
1014 Type expr_type = expr.Type;
1017 if (expr_type == target_type)
1020 e = ImplicitNumericConversion (tc, expr, target_type, l);
1024 e = ImplicitReferenceConversion (expr, target_type);
1028 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1029 IntLiteral i = (IntLiteral) expr;
1032 return new EmptyCast (expr, target_type);
1037 // Attemps to perform an implict constant conversion of the IntLiteral
1038 // into a different data type using casts (See Implicit Constant
1039 // Expression Conversions)
1041 static protected Expression TryImplicitIntConversion (Type target_type, IntLiteral il)
1043 int value = il.Value;
1045 if (target_type == TypeManager.sbyte_type){
1046 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1048 } else if (target_type == TypeManager.byte_type){
1049 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1051 } else if (target_type == TypeManager.short_type){
1052 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1054 } else if (target_type == TypeManager.ushort_type){
1055 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1057 } else if (target_type == TypeManager.uint32_type){
1059 // we can optimize this case: a positive int32
1060 // always fits on a uint32
1064 } else if (target_type == TypeManager.uint64_type){
1066 // we can optimize this case: a positive int32
1067 // always fits on a uint64. But we need an opcode
1071 return new OpcodeCast (il, target_type, OpCodes.Conv_I8);
1078 // Attemptes to implicityly convert `target' into `type', using
1079 // ConvertImplicit. If there is no implicit conversion, then
1080 // an error is signaled
1082 static public Expression ConvertImplicitRequired (TypeContainer tc, Expression target,
1083 Type type, Location l)
1087 e = ConvertImplicit (tc, target, type, l);
1091 string msg = "Can not convert implicitly from `"+
1092 TypeManager.CSharpName (target.Type) + "' to `" +
1093 TypeManager.CSharpName (type) + "'";
1095 Error (tc, 29, l, msg);
1101 // Performs the explicit numeric conversions
1103 static Expression ConvertNumericExplicit (TypeContainer tc, Expression expr,
1106 Type expr_type = expr.Type;
1108 if (expr_type == TypeManager.sbyte_type){
1110 // From sbyte to byte, ushort, uint, ulong, char
1112 if (target_type == TypeManager.byte_type)
1113 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1114 if (target_type == TypeManager.ushort_type)
1115 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1116 if (target_type == TypeManager.uint32_type)
1117 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1118 if (target_type == TypeManager.uint64_type)
1119 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1120 if (target_type == TypeManager.char_type)
1121 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1122 } else if (expr_type == TypeManager.byte_type){
1124 // From byte to sbyte and char
1126 if (target_type == TypeManager.sbyte_type)
1127 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1128 if (target_type == TypeManager.char_type)
1129 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1130 } else if (expr_type == TypeManager.short_type){
1132 // From short to sbyte, byte, ushort, uint, ulong, char
1134 if (target_type == TypeManager.sbyte_type)
1135 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1136 if (target_type == TypeManager.byte_type)
1137 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1138 if (target_type == TypeManager.ushort_type)
1139 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1140 if (target_type == TypeManager.uint32_type)
1141 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1142 if (target_type == TypeManager.uint64_type)
1143 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1144 if (target_type == TypeManager.char_type)
1145 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1146 } else if (expr_type == TypeManager.ushort_type){
1148 // From ushort to sbyte, byte, short, char
1150 if (target_type == TypeManager.sbyte_type)
1151 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1152 if (target_type == TypeManager.byte_type)
1153 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1154 if (target_type == TypeManager.short_type)
1155 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1156 if (target_type == TypeManager.char_type)
1157 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1158 } else if (expr_type == TypeManager.int32_type){
1160 // From int to sbyte, byte, short, ushort, uint, ulong, char
1162 if (target_type == TypeManager.sbyte_type)
1163 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1164 if (target_type == TypeManager.byte_type)
1165 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1166 if (target_type == TypeManager.short_type)
1167 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1168 if (target_type == TypeManager.ushort_type)
1169 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1170 if (target_type == TypeManager.uint32_type)
1171 return new EmptyCast (expr, target_type);
1172 if (target_type == TypeManager.uint64_type)
1173 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1174 if (target_type == TypeManager.char_type)
1175 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1176 } else if (expr_type == TypeManager.uint32_type){
1178 // From uint to sbyte, byte, short, ushort, int, char
1180 if (target_type == TypeManager.sbyte_type)
1181 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1182 if (target_type == TypeManager.byte_type)
1183 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1184 if (target_type == TypeManager.short_type)
1185 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1186 if (target_type == TypeManager.ushort_type)
1187 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1188 if (target_type == TypeManager.int32_type)
1189 return new EmptyCast (expr, target_type);
1190 if (target_type == TypeManager.char_type)
1191 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1192 } else if (expr_type == TypeManager.int64_type){
1194 // From long to sbyte, byte, short, ushort, int, uint, ulong, char
1196 if (target_type == TypeManager.sbyte_type)
1197 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1198 if (target_type == TypeManager.byte_type)
1199 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1200 if (target_type == TypeManager.short_type)
1201 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1202 if (target_type == TypeManager.ushort_type)
1203 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1204 if (target_type == TypeManager.int32_type)
1205 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1206 if (target_type == TypeManager.uint32_type)
1207 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1208 if (target_type == TypeManager.uint64_type)
1209 return new EmptyCast (expr, target_type);
1210 if (target_type == TypeManager.char_type)
1211 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1212 } else if (expr_type == TypeManager.uint64_type){
1214 // From ulong to sbyte, byte, short, ushort, int, uint, long, char
1216 if (target_type == TypeManager.sbyte_type)
1217 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1218 if (target_type == TypeManager.byte_type)
1219 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1220 if (target_type == TypeManager.short_type)
1221 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1222 if (target_type == TypeManager.ushort_type)
1223 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1224 if (target_type == TypeManager.int32_type)
1225 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1226 if (target_type == TypeManager.uint32_type)
1227 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1228 if (target_type == TypeManager.int64_type)
1229 return new EmptyCast (expr, target_type);
1230 if (target_type == TypeManager.char_type)
1231 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1232 } else if (expr_type == TypeManager.char_type){
1234 // From char to sbyte, byte, short
1236 if (target_type == TypeManager.sbyte_type)
1237 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1238 if (target_type == TypeManager.byte_type)
1239 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1240 if (target_type == TypeManager.short_type)
1241 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1242 } else if (expr_type == TypeManager.float_type){
1244 // From float to sbyte, byte, short,
1245 // ushort, int, uint, long, ulong, char
1248 if (target_type == TypeManager.sbyte_type)
1249 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1250 if (target_type == TypeManager.byte_type)
1251 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1252 if (target_type == TypeManager.short_type)
1253 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1254 if (target_type == TypeManager.ushort_type)
1255 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1256 if (target_type == TypeManager.int32_type)
1257 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1258 if (target_type == TypeManager.uint32_type)
1259 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1260 if (target_type == TypeManager.int64_type)
1261 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1262 if (target_type == TypeManager.uint64_type)
1263 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1264 if (target_type == TypeManager.char_type)
1265 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1266 if (target_type == TypeManager.decimal_type)
1267 return InternalTypeConstructor (tc, expr, target_type);
1268 } else if (expr_type == TypeManager.double_type){
1270 // From double to byte, byte, short,
1271 // ushort, int, uint, long, ulong,
1272 // char, float or decimal
1274 if (target_type == TypeManager.sbyte_type)
1275 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1276 if (target_type == TypeManager.byte_type)
1277 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1278 if (target_type == TypeManager.short_type)
1279 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1280 if (target_type == TypeManager.ushort_type)
1281 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1282 if (target_type == TypeManager.int32_type)
1283 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1284 if (target_type == TypeManager.uint32_type)
1285 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1286 if (target_type == TypeManager.int64_type)
1287 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1288 if (target_type == TypeManager.uint64_type)
1289 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1290 if (target_type == TypeManager.char_type)
1291 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1292 if (target_type == TypeManager.float_type)
1293 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
1294 if (target_type == TypeManager.decimal_type)
1295 return InternalTypeConstructor (tc, expr, target_type);
1298 // decimal is taken care of by the op_Explicit methods.
1304 // Implements Explicit Reference conversions
1306 static Expression ConvertReferenceExplicit (TypeContainer tc, Expression expr,
1309 Type expr_type = expr.Type;
1310 bool target_is_value_type = target_type.IsValueType;
1313 // From object to any reference type
1315 if (expr_type == TypeManager.object_type && !target_is_value_type)
1316 return new ClassCast (expr, expr_type);
1322 // Performs an explicit conversion of the expression `expr' whose
1323 // type is expr.Type to `target_type'.
1325 static public Expression ConvertExplicit (TypeContainer tc, Expression expr,
1326 Type target_type, Location l)
1328 Expression ne = ConvertImplicitStandard (tc, expr, target_type, l);
1333 ne = ConvertNumericExplicit (tc, expr, target_type);
1337 ne = ConvertReferenceExplicit (tc, expr, target_type);
1341 ne = ExplicitUserConversion (tc, expr, target_type, l);
1345 Report.Error (30, l, "Cannot convert type '" + TypeManager.CSharpName (expr.Type) + "' to '"
1346 + TypeManager.CSharpName (target_type) + "'");
1350 static string ExprClassName (ExprClass c)
1353 case ExprClass.Invalid:
1355 case ExprClass.Value:
1357 case ExprClass.Variable:
1359 case ExprClass.Namespace:
1361 case ExprClass.Type:
1363 case ExprClass.MethodGroup:
1364 return "method group";
1365 case ExprClass.PropertyAccess:
1366 return "property access";
1367 case ExprClass.EventAccess:
1368 return "event access";
1369 case ExprClass.IndexerAccess:
1370 return "indexer access";
1371 case ExprClass.Nothing:
1374 throw new Exception ("Should not happen");
1378 // Reports that we were expecting `expr' to be of class `expected'
1380 protected void report118 (TypeContainer tc, Location l, Expression expr, string expected)
1382 string kind = "Unknown";
1385 kind = ExprClassName (expr.ExprClass);
1387 Error (tc, 118, l, "Expression denotes a '" + kind +
1388 "' where an " + expected + " was expected");
1393 // This is just a base class for expressions that can
1394 // appear on statements (invocations, object creation,
1395 // assignments, post/pre increment and decrement). The idea
1396 // being that they would support an extra Emition interface that
1397 // does not leave a result on the stack.
1400 public abstract class ExpressionStatement : Expression {
1403 // Requests the expression to be emitted in a `statement'
1404 // context. This means that no new value is left on the
1405 // stack after invoking this method (constrasted with
1406 // Emit that will always leave a value on the stack).
1408 public abstract void EmitStatement (EmitContext ec);
1412 // This kind of cast is used to encapsulate the child
1413 // whose type is child.Type into an expression that is
1414 // reported to return "return_type". This is used to encapsulate
1415 // expressions which have compatible types, but need to be dealt
1416 // at higher levels with.
1418 // For example, a "byte" expression could be encapsulated in one
1419 // of these as an "unsigned int". The type for the expression
1420 // would be "unsigned int".
1424 public class EmptyCast : Expression {
1425 protected Expression child;
1427 public EmptyCast (Expression child, Type return_type)
1429 ExprClass = child.ExprClass;
1434 public override Expression DoResolve (TypeContainer tc)
1436 // This should never be invoked, we are born in fully
1437 // initialized state.
1442 public override void Emit (EmitContext ec)
1449 // This kind of cast is used to encapsulate Value Types in objects.
1451 // The effect of it is to box the value type emitted by the previous
1454 public class BoxedCast : EmptyCast {
1456 public BoxedCast (Expression expr)
1457 : base (expr, TypeManager.object_type)
1461 public override Expression DoResolve (TypeContainer tc)
1463 // This should never be invoked, we are born in fully
1464 // initialized state.
1469 public override void Emit (EmitContext ec)
1472 ec.ig.Emit (OpCodes.Box, child.Type);
1477 // This kind of cast is used to encapsulate a child expression
1478 // that can be trivially converted to a target type using one or
1479 // two opcodes. The opcodes are passed as arguments.
1481 public class OpcodeCast : EmptyCast {
1485 public OpcodeCast (Expression child, Type return_type, OpCode op)
1486 : base (child, return_type)
1490 second_valid = false;
1493 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
1494 : base (child, return_type)
1499 second_valid = true;
1502 public override Expression DoResolve (TypeContainer tc)
1504 // This should never be invoked, we are born in fully
1505 // initialized state.
1510 public override void Emit (EmitContext ec)
1522 // This kind of cast is used to encapsulate a child and cast it
1523 // to the class requested
1525 public class ClassCast : EmptyCast {
1526 public ClassCast (Expression child, Type return_type)
1527 : base (child, return_type)
1532 public override Expression DoResolve (TypeContainer tc)
1534 // This should never be invoked, we are born in fully
1535 // initialized state.
1540 public override void Emit (EmitContext ec)
1544 ec.ig.Emit (OpCodes.Castclass, type);
1550 // Unary expressions.
1554 // Unary implements unary expressions. It derives from
1555 // ExpressionStatement becuase the pre/post increment/decrement
1556 // operators can be used in a statement context.
1558 public class Unary : ExpressionStatement {
1559 public enum Operator {
1560 Addition, Subtraction, Negate, BitComplement,
1561 Indirection, AddressOf, PreIncrement,
1562 PreDecrement, PostIncrement, PostDecrement
1567 ArrayList Arguments;
1571 public Unary (Operator op, Expression expr, Location loc)
1575 this.location = loc;
1578 public Expression Expr {
1588 public Operator Oper {
1599 // Returns a stringified representation of the Operator
1604 case Operator.Addition:
1606 case Operator.Subtraction:
1608 case Operator.Negate:
1610 case Operator.BitComplement:
1612 case Operator.AddressOf:
1614 case Operator.Indirection:
1616 case Operator.PreIncrement : case Operator.PostIncrement :
1618 case Operator.PreDecrement : case Operator.PostDecrement :
1622 return oper.ToString ();
1625 Expression ForceConversion (TypeContainer tc, Expression expr, Type target_type)
1627 if (expr.Type == target_type)
1630 return ConvertImplicit (tc, expr, target_type, new Location (-1));
1633 void error23 (TypeContainer tc, Type t)
1635 Report.Error (23, location, "Operator " + OperName () +
1636 " cannot be applied to operand of type `" +
1637 TypeManager.CSharpName (t) + "'");
1641 // Returns whether an object of type `t' can be incremented
1642 // or decremented with add/sub (ie, basically whether we can
1643 // use pre-post incr-decr operations on it, but it is not a
1644 // System.Decimal, which we test elsewhere)
1646 static bool IsIncrementableNumber (Type t)
1648 return (t == TypeManager.sbyte_type) ||
1649 (t == TypeManager.byte_type) ||
1650 (t == TypeManager.short_type) ||
1651 (t == TypeManager.ushort_type) ||
1652 (t == TypeManager.int32_type) ||
1653 (t == TypeManager.uint32_type) ||
1654 (t == TypeManager.int64_type) ||
1655 (t == TypeManager.uint64_type) ||
1656 (t == TypeManager.char_type) ||
1657 (t.IsSubclassOf (TypeManager.enum_type)) ||
1658 (t == TypeManager.float_type) ||
1659 (t == TypeManager.double_type);
1662 Expression ResolveOperator (TypeContainer tc)
1664 Type expr_type = expr.Type;
1667 // Step 1: Perform Operator Overload location
1672 if (oper == Operator.PostIncrement || oper == Operator.PreIncrement)
1673 op_name = "op_Increment";
1674 else if (oper == Operator.PostDecrement || oper == Operator.PreDecrement)
1675 op_name = "op_Decrement";
1677 op_name = "op_" + oper;
1679 mg = MemberLookup (tc, expr_type, op_name, false);
1681 if (mg == null && expr_type.BaseType != null)
1682 mg = MemberLookup (tc, expr_type.BaseType, op_name, false);
1685 Arguments = new ArrayList ();
1686 Arguments.Add (new Argument (expr, Argument.AType.Expression));
1688 method = Invocation.OverloadResolve (tc, (MethodGroupExpr) mg,
1689 Arguments, location);
1690 if (method != null) {
1691 MethodInfo mi = (MethodInfo) method;
1692 type = mi.ReturnType;
1695 error23 (tc, expr_type);
1702 // Step 2: Default operations on CLI native types.
1705 // Only perform numeric promotions on:
1708 if (expr_type == null)
1711 if (oper == Operator.Negate){
1712 if (expr_type != TypeManager.bool_type) {
1713 error23 (tc, expr.Type);
1717 type = TypeManager.bool_type;
1721 if (oper == Operator.BitComplement) {
1722 if (!((expr_type == TypeManager.int32_type) ||
1723 (expr_type == TypeManager.uint32_type) ||
1724 (expr_type == TypeManager.int64_type) ||
1725 (expr_type == TypeManager.uint64_type) ||
1726 (expr_type.IsSubclassOf (TypeManager.enum_type)))){
1727 error23 (tc, expr.Type);
1734 if (oper == Operator.Addition) {
1736 // A plus in front of something is just a no-op, so return the child.
1742 // Deals with -literals
1743 // int operator- (int x)
1744 // long operator- (long x)
1745 // float operator- (float f)
1746 // double operator- (double d)
1747 // decimal operator- (decimal d)
1749 if (oper == Operator.Subtraction){
1751 // Fold a "- Constant" into a negative constant
1754 Expression e = null;
1757 // Is this a constant?
1759 if (expr is IntLiteral)
1760 e = new IntLiteral (-((IntLiteral) expr).Value);
1761 else if (expr is LongLiteral)
1762 e = new LongLiteral (-((LongLiteral) expr).Value);
1763 else if (expr is FloatLiteral)
1764 e = new FloatLiteral (-((FloatLiteral) expr).Value);
1765 else if (expr is DoubleLiteral)
1766 e = new DoubleLiteral (-((DoubleLiteral) expr).Value);
1767 else if (expr is DecimalLiteral)
1768 e = new DecimalLiteral (-((DecimalLiteral) expr).Value);
1776 // Not a constant we can optimize, perform numeric
1777 // promotions to int, long, double.
1780 // The following is inneficient, because we call
1781 // ConvertImplicit too many times.
1783 // It is also not clear if we should convert to Float
1784 // or Double initially.
1786 Location l = new Location (-1);
1788 if (expr_type == TypeManager.uint32_type){
1790 // FIXME: handle exception to this rule that
1791 // permits the int value -2147483648 (-2^31) to
1792 // bt written as a decimal interger literal
1794 type = TypeManager.int64_type;
1795 expr = ConvertImplicit (tc, expr, type, l);
1799 if (expr_type == TypeManager.uint64_type){
1801 // FIXME: Handle exception of `long value'
1802 // -92233720368547758087 (-2^63) to be written as
1803 // decimal integer literal.
1805 error23 (tc, expr_type);
1809 e = ConvertImplicit (tc, expr, TypeManager.int32_type, l);
1816 e = ConvertImplicit (tc, expr, TypeManager.int64_type, l);
1823 e = ConvertImplicit (tc, expr, TypeManager.double_type, l);
1830 error23 (tc, expr_type);
1835 // The operand of the prefix/postfix increment decrement operators
1836 // should be an expression that is classified as a variable,
1837 // a property access or an indexer access
1839 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
1840 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
1841 if (expr.ExprClass == ExprClass.Variable){
1842 if (IsIncrementableNumber (expr_type) ||
1843 expr_type == TypeManager.decimal_type){
1847 } else if (expr.ExprClass == ExprClass.IndexerAccess){
1849 // FIXME: Verify that we have both get and set methods
1851 throw new Exception ("Implement me");
1852 } else if (expr.ExprClass == ExprClass.PropertyAccess){
1854 // FIXME: Verify that we have both get and set methods
1856 throw new Exception ("Implement me");
1858 report118 (tc, location, expr,
1859 "variable, indexer or property access");
1863 if (oper == Operator.AddressOf){
1864 if (expr.ExprClass != ExprClass.Variable){
1865 Error (tc, 211, "Cannot take the address of non-variables");
1868 type = Type.GetType (expr.Type.ToString () + "*");
1871 Error (tc, 187, "No such operator '" + OperName () + "' defined for type '" +
1872 TypeManager.CSharpName (expr_type) + "'");
1877 public override Expression DoResolve (TypeContainer tc)
1879 expr = expr.Resolve (tc);
1884 eclass = ExprClass.Value;
1885 return ResolveOperator (tc);
1888 public override void Emit (EmitContext ec)
1890 ILGenerator ig = ec.ig;
1891 Type expr_type = expr.Type;
1893 if (method != null) {
1895 // Note that operators are static anyway
1897 if (Arguments != null)
1898 Invocation.EmitArguments (ec, method, Arguments);
1901 // Post increment/decrement operations need a copy at this
1904 if (oper == Operator.PostDecrement || oper == Operator.PostIncrement)
1905 ig.Emit (OpCodes.Dup);
1908 ig.Emit (OpCodes.Call, (MethodInfo) method);
1911 // Pre Increment and Decrement operators
1913 if (oper == Operator.PreIncrement || oper == Operator.PreDecrement){
1914 ig.Emit (OpCodes.Dup);
1918 // Increment and Decrement should store the result
1920 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
1921 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
1922 ((LValue) expr).Store (ec);
1928 case Operator.Addition:
1929 throw new Exception ("This should be caught by Resolve");
1931 case Operator.Subtraction:
1933 ig.Emit (OpCodes.Neg);
1936 case Operator.Negate:
1938 ig.Emit (OpCodes.Ldc_I4_0);
1939 ig.Emit (OpCodes.Ceq);
1942 case Operator.BitComplement:
1944 ig.Emit (OpCodes.Not);
1947 case Operator.AddressOf:
1948 ((LValue)expr).AddressOf (ec);
1951 case Operator.Indirection:
1952 throw new Exception ("Not implemented yet");
1954 case Operator.PreIncrement:
1955 case Operator.PreDecrement:
1956 if (expr.ExprClass == ExprClass.Variable){
1958 // Resolve already verified that it is an "incrementable"
1961 ig.Emit (OpCodes.Ldc_I4_1);
1963 if (oper == Operator.PreDecrement)
1964 ig.Emit (OpCodes.Sub);
1966 ig.Emit (OpCodes.Add);
1967 ig.Emit (OpCodes.Dup);
1968 ((LValue) expr).Store (ec);
1970 throw new Exception ("Handle Indexers and Properties here");
1974 case Operator.PostIncrement:
1975 case Operator.PostDecrement:
1976 if (expr.ExprClass == ExprClass.Variable){
1978 // Resolve already verified that it is an "incrementable"
1981 ig.Emit (OpCodes.Dup);
1982 ig.Emit (OpCodes.Ldc_I4_1);
1984 if (oper == Operator.PostDecrement)
1985 ig.Emit (OpCodes.Sub);
1987 ig.Emit (OpCodes.Add);
1988 ((LValue) expr).Store (ec);
1990 throw new Exception ("Handle Indexers and Properties here");
1995 throw new Exception ("This should not happen: Operator = "
1996 + oper.ToString ());
2001 public override void EmitStatement (EmitContext ec)
2004 // FIXME: we should rewrite this code to generate
2005 // better code for ++ and -- as we know we wont need
2006 // the values on the stack
2009 ec.ig.Emit (OpCodes.Pop);
2013 public class Probe : Expression {
2014 public readonly string ProbeType;
2015 public readonly Operator Oper;
2019 public enum Operator {
2023 public Probe (Operator oper, Expression expr, string probe_type)
2026 ProbeType = probe_type;
2030 public Expression Expr {
2036 public override Expression DoResolve (TypeContainer tc)
2038 probe_type = tc.LookupType (ProbeType, false);
2040 if (probe_type == null)
2043 expr = expr.Resolve (tc);
2045 type = TypeManager.bool_type;
2046 eclass = ExprClass.Value;
2051 public override void Emit (EmitContext ec)
2053 ILGenerator ig = ec.ig;
2057 if (Oper == Operator.Is){
2058 ig.Emit (OpCodes.Isinst, probe_type);
2059 ig.Emit (OpCodes.Ldnull);
2060 ig.Emit (OpCodes.Cgt_Un);
2062 ig.Emit (OpCodes.Isinst, probe_type);
2068 // This represents a typecast in the source language.
2070 // FIXME: Cast expressions have an unusual set of parsing
2071 // rules, we need to figure those out.
2073 public class Cast : Expression {
2078 public Cast (string cast_type, Expression expr, Location loc)
2080 this.target_type = cast_type;
2082 this.location = loc;
2085 public string TargetType {
2091 public Expression Expr {
2100 public override Expression DoResolve (TypeContainer tc)
2102 expr = expr.Resolve (tc);
2106 type = tc.LookupType (target_type, false);
2107 eclass = ExprClass.Value;
2112 expr = ConvertExplicit (tc, expr, type, location);
2117 public override void Emit (EmitContext ec)
2120 // This one will never happen
2122 throw new Exception ("Should not happen");
2126 public class Binary : Expression {
2127 public enum Operator {
2128 Multiply, Division, Modulus,
2129 Addition, Subtraction,
2130 LeftShift, RightShift,
2131 LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
2132 Equality, Inequality,
2141 Expression left, right;
2143 ArrayList Arguments;
2147 public Binary (Operator oper, Expression left, Expression right, Location loc)
2152 this.location = loc;
2155 public Operator Oper {
2164 public Expression Left {
2173 public Expression Right {
2184 // Returns a stringified representation of the Operator
2189 case Operator.Multiply:
2191 case Operator.Division:
2193 case Operator.Modulus:
2195 case Operator.Addition:
2197 case Operator.Subtraction:
2199 case Operator.LeftShift:
2201 case Operator.RightShift:
2203 case Operator.LessThan:
2205 case Operator.GreaterThan:
2207 case Operator.LessThanOrEqual:
2209 case Operator.GreaterThanOrEqual:
2211 case Operator.Equality:
2213 case Operator.Inequality:
2215 case Operator.BitwiseAnd:
2217 case Operator.BitwiseOr:
2219 case Operator.ExclusiveOr:
2221 case Operator.LogicalOr:
2223 case Operator.LogicalAnd:
2227 return oper.ToString ();
2230 Expression ForceConversion (TypeContainer tc, Expression expr, Type target_type)
2232 if (expr.Type == target_type)
2235 return ConvertImplicit (tc, expr, target_type, new Location (-1));
2239 // Note that handling the case l == Decimal || r == Decimal
2240 // is taken care of by the Step 1 Operator Overload resolution.
2242 void DoNumericPromotions (TypeContainer tc, Type l, Type r)
2244 if (l == TypeManager.double_type || r == TypeManager.double_type){
2246 // If either operand is of type double, the other operand is
2247 // conveted to type double.
2249 if (r != TypeManager.double_type)
2250 right = ConvertImplicit (tc, right, TypeManager.double_type, location);
2251 if (l != TypeManager.double_type)
2252 left = ConvertImplicit (tc, left, TypeManager.double_type, location);
2254 type = TypeManager.double_type;
2255 } else if (l == TypeManager.float_type || r == TypeManager.float_type){
2257 // if either operand is of type float, th eother operand is
2258 // converd to type float.
2260 if (r != TypeManager.double_type)
2261 right = ConvertImplicit (tc, right, TypeManager.float_type, location);
2262 if (l != TypeManager.double_type)
2263 left = ConvertImplicit (tc, left, TypeManager.float_type, location);
2264 type = TypeManager.float_type;
2265 } else if (l == TypeManager.uint64_type || r == TypeManager.uint64_type){
2269 // If either operand is of type ulong, the other operand is
2270 // converted to type ulong. or an error ocurrs if the other
2271 // operand is of type sbyte, short, int or long
2274 if (l == TypeManager.uint64_type){
2275 if (r != TypeManager.uint64_type && right is IntLiteral){
2276 e = TryImplicitIntConversion (l, (IntLiteral) right);
2282 if (left is IntLiteral){
2283 e = TryImplicitIntConversion (r, (IntLiteral) left);
2290 if ((other == TypeManager.sbyte_type) ||
2291 (other == TypeManager.short_type) ||
2292 (other == TypeManager.int32_type) ||
2293 (other == TypeManager.int64_type)){
2294 string oper = OperName ();
2296 Error (tc, 34, location, "Operator `" + OperName ()
2297 + "' is ambiguous on operands of type `"
2298 + TypeManager.CSharpName (l) + "' "
2299 + "and `" + TypeManager.CSharpName (r)
2302 type = TypeManager.uint64_type;
2303 } else if (l == TypeManager.int64_type || r == TypeManager.int64_type){
2305 // If either operand is of type long, the other operand is converted
2308 if (l != TypeManager.int64_type)
2309 left = ConvertImplicit (tc, left, TypeManager.int64_type, location);
2310 if (r != TypeManager.int64_type)
2311 right = ConvertImplicit (tc, right, TypeManager.int64_type, location);
2313 type = TypeManager.int64_type;
2314 } else if (l == TypeManager.uint32_type || r == TypeManager.uint32_type){
2316 // If either operand is of type uint, and the other
2317 // operand is of type sbyte, short or int, othe operands are
2318 // converted to type long.
2322 if (l == TypeManager.uint32_type)
2324 else if (r == TypeManager.uint32_type)
2327 if ((other == TypeManager.sbyte_type) ||
2328 (other == TypeManager.short_type) ||
2329 (other == TypeManager.int32_type)){
2330 left = ForceConversion (tc, left, TypeManager.int64_type);
2331 right = ForceConversion (tc, right, TypeManager.int64_type);
2332 type = TypeManager.int64_type;
2335 // if either operand is of type uint, the other
2336 // operand is converd to type uint
2338 left = ForceConversion (tc, left, TypeManager.uint32_type);
2339 right = ForceConversion (tc, right, TypeManager.uint32_type);
2340 type = TypeManager.uint32_type;
2342 } else if (l == TypeManager.decimal_type || r == TypeManager.decimal_type){
2343 if (l != TypeManager.decimal_type)
2344 left = ConvertImplicit (tc, left, TypeManager.decimal_type, location);
2345 if (r != TypeManager.decimal_type)
2346 right = ConvertImplicit (tc, right, TypeManager.decimal_type, location);
2348 type = TypeManager.decimal_type;
2350 Expression l_tmp, r_tmp;
2352 l_tmp = ForceConversion (tc, left, TypeManager.int32_type);
2353 if (l_tmp == null) {
2359 r_tmp = ForceConversion (tc, right, TypeManager.int32_type);
2360 if (r_tmp == null) {
2366 type = TypeManager.int32_type;
2370 void error19 (TypeContainer tc)
2372 Error (tc, 19, location,
2373 "Operator " + OperName () + " cannot be applied to operands of type `" +
2374 TypeManager.CSharpName (left.Type) + "' and `" +
2375 TypeManager.CSharpName (right.Type) + "'");
2379 Expression CheckShiftArguments (TypeContainer tc)
2383 Type r = right.Type;
2385 e = ForceConversion (tc, right, TypeManager.int32_type);
2392 Location loc = location;
2394 if (((e = ConvertImplicit (tc, left, TypeManager.int32_type, loc)) != null) ||
2395 ((e = ConvertImplicit (tc, left, TypeManager.uint32_type, loc)) != null) ||
2396 ((e = ConvertImplicit (tc, left, TypeManager.int64_type, loc)) != null) ||
2397 ((e = ConvertImplicit (tc, left, TypeManager.uint64_type, loc)) != null)){
2407 Expression ResolveOperator (TypeContainer tc)
2410 Type r = right.Type;
2413 // Step 1: Perform Operator Overload location
2415 Expression left_expr, right_expr;
2417 string op = "op_" + oper;
2419 left_expr = MemberLookup (tc, l, op, false);
2420 if (left_expr == null && l.BaseType != null)
2421 left_expr = MemberLookup (tc, l.BaseType, op, false);
2423 right_expr = MemberLookup (tc, r, op, false);
2424 if (right_expr == null && r.BaseType != null)
2425 right_expr = MemberLookup (tc, r.BaseType, op, false);
2427 MethodGroupExpr union = Invocation.MakeUnionSet (left_expr, right_expr);
2429 if (union != null) {
2430 Arguments = new ArrayList ();
2431 Arguments.Add (new Argument (left, Argument.AType.Expression));
2432 Arguments.Add (new Argument (right, Argument.AType.Expression));
2434 method = Invocation.OverloadResolve (tc, union, Arguments, location);
2435 if (method != null) {
2436 MethodInfo mi = (MethodInfo) method;
2437 type = mi.ReturnType;
2446 // Step 2: Default operations on CLI native types.
2449 // Only perform numeric promotions on:
2450 // +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
2452 if (oper == Operator.Addition){
2454 // If any of the arguments is a string, cast to string
2456 if (l == TypeManager.string_type){
2457 if (r == TypeManager.string_type){
2459 method = TypeManager.string_concat_string_string;
2462 method = TypeManager.string_concat_object_object;
2463 right = ConvertImplicit (tc, right,
2464 TypeManager.object_type, location);
2466 type = TypeManager.string_type;
2468 Arguments = new ArrayList ();
2469 Arguments.Add (new Argument (left, Argument.AType.Expression));
2470 Arguments.Add (new Argument (right, Argument.AType.Expression));
2474 } else if (r == TypeManager.string_type){
2476 method = TypeManager.string_concat_object_object;
2477 Arguments = new ArrayList ();
2478 Arguments.Add (new Argument (left, Argument.AType.Expression));
2479 Arguments.Add (new Argument (right, Argument.AType.Expression));
2481 left = ConvertImplicit (tc, left, TypeManager.object_type, location);
2482 type = TypeManager.string_type;
2488 // FIXME: is Delegate operator + (D x, D y) handled?
2492 if (oper == Operator.LeftShift || oper == Operator.RightShift)
2493 return CheckShiftArguments (tc);
2495 if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
2496 if (l != TypeManager.bool_type || r != TypeManager.bool_type)
2499 type = TypeManager.bool_type;
2504 // We are dealing with numbers
2507 DoNumericPromotions (tc, l, r);
2509 if (left == null || right == null)
2513 if (oper == Operator.BitwiseAnd ||
2514 oper == Operator.BitwiseOr ||
2515 oper == Operator.ExclusiveOr){
2516 if (!((l == TypeManager.int32_type) ||
2517 (l == TypeManager.uint32_type) ||
2518 (l == TypeManager.int64_type) ||
2519 (l == TypeManager.uint64_type))){
2526 if (oper == Operator.Equality ||
2527 oper == Operator.Inequality ||
2528 oper == Operator.LessThanOrEqual ||
2529 oper == Operator.LessThan ||
2530 oper == Operator.GreaterThanOrEqual ||
2531 oper == Operator.GreaterThan){
2532 type = TypeManager.bool_type;
2538 public override Expression DoResolve (TypeContainer tc)
2540 left = left.Resolve (tc);
2541 right = right.Resolve (tc);
2543 if (left == null || right == null)
2546 if (left.Type == null)
2547 throw new Exception (
2548 "Resolve returned non null, but did not set the type! (" +
2550 if (right.Type == null)
2551 throw new Exception (
2552 "Resolve returned non null, but did not set the type! (" +
2555 eclass = ExprClass.Value;
2557 return ResolveOperator (tc);
2560 public bool IsBranchable ()
2562 if (oper == Operator.Equality ||
2563 oper == Operator.Inequality ||
2564 oper == Operator.LessThan ||
2565 oper == Operator.GreaterThan ||
2566 oper == Operator.LessThanOrEqual ||
2567 oper == Operator.GreaterThanOrEqual){
2574 // This entry point is used by routines that might want
2575 // to emit a brfalse/brtrue after an expression, and instead
2576 // they could use a more compact notation.
2578 // Typically the code would generate l.emit/r.emit, followed
2579 // by the comparission and then a brtrue/brfalse. The comparissions
2580 // are sometimes inneficient (there are not as complete as the branches
2581 // look for the hacks in Emit using double ceqs).
2583 // So for those cases we provide EmitBranchable that can emit the
2584 // branch with the test
2586 public void EmitBranchable (EmitContext ec, int target)
2589 bool close_target = false;
2595 case Operator.Equality:
2597 opcode = OpCodes.Beq_S;
2599 opcode = OpCodes.Beq;
2602 case Operator.Inequality:
2604 opcode = OpCodes.Bne_Un_S;
2606 opcode = OpCodes.Bne_Un;
2609 case Operator.LessThan:
2611 opcode = OpCodes.Blt_S;
2613 opcode = OpCodes.Blt;
2616 case Operator.GreaterThan:
2618 opcode = OpCodes.Bgt_S;
2620 opcode = OpCodes.Bgt;
2623 case Operator.LessThanOrEqual:
2625 opcode = OpCodes.Ble_S;
2627 opcode = OpCodes.Ble;
2630 case Operator.GreaterThanOrEqual:
2632 opcode = OpCodes.Bge_S;
2634 opcode = OpCodes.Ble;
2638 throw new Exception ("EmitBranchable called on non-EmitBranchable operator: "
2639 + oper.ToString ());
2642 ec.ig.Emit (opcode, target);
2645 public override void Emit (EmitContext ec)
2647 ILGenerator ig = ec.ig;
2649 Type r = right.Type;
2652 if (method != null) {
2654 // Note that operators are static anyway
2656 if (Arguments != null)
2657 Invocation.EmitArguments (ec, method, Arguments);
2659 if (method is MethodInfo)
2660 ig.Emit (OpCodes.Call, (MethodInfo) method);
2662 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
2671 case Operator.Multiply:
2673 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2674 opcode = OpCodes.Mul_Ovf;
2675 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2676 opcode = OpCodes.Mul_Ovf_Un;
2678 opcode = OpCodes.Mul;
2680 opcode = OpCodes.Mul;
2684 case Operator.Division:
2685 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2686 opcode = OpCodes.Div_Un;
2688 opcode = OpCodes.Div;
2691 case Operator.Modulus:
2692 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2693 opcode = OpCodes.Rem_Un;
2695 opcode = OpCodes.Rem;
2698 case Operator.Addition:
2700 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2701 opcode = OpCodes.Add_Ovf;
2702 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2703 opcode = OpCodes.Add_Ovf_Un;
2705 opcode = OpCodes.Mul;
2707 opcode = OpCodes.Add;
2710 case Operator.Subtraction:
2712 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2713 opcode = OpCodes.Sub_Ovf;
2714 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2715 opcode = OpCodes.Sub_Ovf_Un;
2717 opcode = OpCodes.Sub;
2719 opcode = OpCodes.Sub;
2722 case Operator.RightShift:
2723 opcode = OpCodes.Shr;
2726 case Operator.LeftShift:
2727 opcode = OpCodes.Shl;
2730 case Operator.Equality:
2731 opcode = OpCodes.Ceq;
2734 case Operator.Inequality:
2735 ec.ig.Emit (OpCodes.Ceq);
2736 ec.ig.Emit (OpCodes.Ldc_I4_0);
2738 opcode = OpCodes.Ceq;
2741 case Operator.LessThan:
2742 opcode = OpCodes.Clt;
2745 case Operator.GreaterThan:
2746 opcode = OpCodes.Cgt;
2749 case Operator.LessThanOrEqual:
2750 ec.ig.Emit (OpCodes.Cgt);
2751 ec.ig.Emit (OpCodes.Ldc_I4_0);
2753 opcode = OpCodes.Ceq;
2756 case Operator.GreaterThanOrEqual:
2757 ec.ig.Emit (OpCodes.Clt);
2758 ec.ig.Emit (OpCodes.Ldc_I4_1);
2760 opcode = OpCodes.Sub;
2763 case Operator.LogicalOr:
2764 case Operator.BitwiseOr:
2765 opcode = OpCodes.Or;
2768 case Operator.LogicalAnd:
2769 case Operator.BitwiseAnd:
2770 opcode = OpCodes.And;
2773 case Operator.ExclusiveOr:
2774 opcode = OpCodes.Xor;
2778 throw new Exception ("This should not happen: Operator = "
2779 + oper.ToString ());
2786 public class Conditional : Expression {
2787 Expression expr, trueExpr, falseExpr;
2790 public Conditional (Expression expr, Expression trueExpr, Expression falseExpr, Location l)
2793 this.trueExpr = trueExpr;
2794 this.falseExpr = falseExpr;
2798 public Expression Expr {
2804 public Expression TrueExpr {
2810 public Expression FalseExpr {
2816 public override Expression DoResolve (TypeContainer tc)
2818 expr = expr.Resolve (tc);
2820 if (expr.Type != TypeManager.bool_type)
2821 expr = Expression.ConvertImplicitRequired (
2822 tc, expr, TypeManager.bool_type, l);
2824 trueExpr = trueExpr.Resolve (tc);
2825 falseExpr = falseExpr.Resolve (tc);
2827 if (expr == null || trueExpr == null || falseExpr == null)
2830 if (trueExpr.Type == falseExpr.Type)
2831 type = trueExpr.Type;
2836 // First, if an implicit conversion exists from trueExpr
2837 // to falseExpr, then the result type is of type falseExpr.Type
2839 conv = ConvertImplicit (tc, trueExpr, falseExpr.Type, l);
2841 type = falseExpr.Type;
2843 } else if ((conv = ConvertImplicit (tc,falseExpr,trueExpr.Type,l)) != null){
2844 type = trueExpr.Type;
2847 Error (tc, 173, l, "The type of the conditional expression can " +
2848 "not be computed because there is no implicit conversion" +
2849 " from `" + TypeManager.CSharpName (trueExpr.Type) + "'" +
2850 " and `" + TypeManager.CSharpName (falseExpr.Type) + "'");
2855 eclass = ExprClass.Value;
2859 public override void Emit (EmitContext ec)
2861 ILGenerator ig = ec.ig;
2862 Label false_target = ig.DefineLabel ();
2863 Label end_target = ig.DefineLabel ();
2866 ig.Emit (OpCodes.Brfalse, false_target);
2868 ig.Emit (OpCodes.Br, end_target);
2869 ig.MarkLabel (false_target);
2870 falseExpr.Emit (ec);
2871 ig.MarkLabel (end_target);
2875 public class SimpleName : Expression {
2876 public readonly string Name;
2877 public readonly Location Location;
2879 public SimpleName (string name, Location l)
2886 // Checks whether we are trying to access an instance
2887 // property, method or field from a static body.
2889 Expression MemberStaticCheck (Expression e)
2891 if (e is FieldExpr){
2892 FieldInfo fi = ((FieldExpr) e).FieldInfo;
2897 "An object reference is required " +
2898 "for the non-static field `"+Name+"'");
2901 } else if (e is MethodGroupExpr){
2902 // FIXME: Pending reorganization of MemberLookup
2903 // Basically at this point we should have the
2904 // best match already selected for us, and
2905 // we should only have to check a *single*
2906 // Method for its static on/off bit.
2908 } else if (e is PropertyExpr){
2909 if (!((PropertyExpr) e).IsStatic){
2911 "An object reference is required " +
2912 "for the non-static property access `"+
2922 // 7.5.2: Simple Names.
2924 // Local Variables and Parameters are handled at
2925 // parse time, so they never occur as SimpleNames.
2927 Expression ResolveSimpleName (TypeContainer tc)
2931 e = MemberLookup (tc, tc.TypeBuilder, Name, true);
2935 else if (e is FieldExpr){
2936 FieldExpr fe = (FieldExpr) e;
2938 if (!fe.FieldInfo.IsStatic)
2939 fe.Instance = new This ();
2942 if ((tc.ModFlags & Modifiers.STATIC) != 0)
2943 return MemberStaticCheck (e);
2949 // Do step 3 of the Simple Name resolution.
2951 // FIXME: implement me.
2953 Error (tc, 103, Location, "The name `" + Name + "' does not exist in the class `" +
2960 // SimpleName needs to handle a multitude of cases:
2962 // simple_names and qualified_identifiers are placed on
2963 // the tree equally.
2965 public override Expression DoResolve (TypeContainer tc)
2967 if (Name.IndexOf (".") != -1)
2968 return ResolveMemberAccess (tc, Name);
2970 return ResolveSimpleName (tc);
2973 public override void Emit (EmitContext ec)
2975 throw new Exception ("SimpleNames should be gone from the tree");
2980 // A simple interface that should be implemeneted by LValues
2982 public interface LValue {
2985 // The Store method should store the contents of the top
2986 // of the stack into the storage that is implemented by
2987 // the particular implementation of LValue
2989 void Store (EmitContext ec);
2992 // The AddressOf method should generate code that loads
2993 // the address of the LValue and leaves it on the stack
2995 void AddressOf (EmitContext ec);
2998 public class LocalVariableReference : Expression, LValue {
2999 public readonly string Name;
3000 public readonly Block Block;
3002 public LocalVariableReference (Block block, string name)
3006 eclass = ExprClass.Variable;
3009 public VariableInfo VariableInfo {
3011 return Block.GetVariableInfo (Name);
3015 public override Expression DoResolve (TypeContainer tc)
3017 VariableInfo vi = Block.GetVariableInfo (Name);
3019 type = vi.VariableType;
3023 public override void Emit (EmitContext ec)
3025 VariableInfo vi = VariableInfo;
3026 ILGenerator ig = ec.ig;
3033 ig.Emit (OpCodes.Ldloc_0);
3037 ig.Emit (OpCodes.Ldloc_1);
3041 ig.Emit (OpCodes.Ldloc_2);
3045 ig.Emit (OpCodes.Ldloc_3);
3050 ig.Emit (OpCodes.Ldloc_S, (byte) idx);
3052 ig.Emit (OpCodes.Ldloc, idx);
3057 public void Store (EmitContext ec)
3059 ILGenerator ig = ec.ig;
3060 VariableInfo vi = VariableInfo;
3066 ig.Emit (OpCodes.Stloc_0);
3070 ig.Emit (OpCodes.Stloc_1);
3074 ig.Emit (OpCodes.Stloc_2);
3078 ig.Emit (OpCodes.Stloc_3);
3083 ig.Emit (OpCodes.Stloc_S, (byte) idx);
3085 ig.Emit (OpCodes.Stloc, idx);
3090 public void AddressOf (EmitContext ec)
3092 VariableInfo vi = VariableInfo;
3099 ec.ig.Emit (OpCodes.Ldloca_S, (byte) idx);
3101 ec.ig.Emit (OpCodes.Ldloca, idx);
3105 public class ParameterReference : Expression, LValue {
3106 public readonly Parameters Pars;
3107 public readonly String Name;
3108 public readonly int Idx;
3110 public ParameterReference (Parameters pars, int idx, string name)
3115 eclass = ExprClass.Variable;
3118 public override Expression DoResolve (TypeContainer tc)
3120 Type [] types = Pars.GetParameterInfo (tc);
3127 public override void Emit (EmitContext ec)
3130 ec.ig.Emit (OpCodes.Ldarg_S, (byte) Idx);
3132 ec.ig.Emit (OpCodes.Ldarg, Idx);
3135 public void Store (EmitContext ec)
3138 ec.ig.Emit (OpCodes.Starg_S, (byte) Idx);
3140 ec.ig.Emit (OpCodes.Starg, Idx);
3144 public void AddressOf (EmitContext ec)
3147 ec.ig.Emit (OpCodes.Ldarga_S, (byte) Idx);
3149 ec.ig.Emit (OpCodes.Ldarga, Idx);
3154 // Used for arguments to New(), Invocation()
3156 public class Argument {
3163 public readonly AType Type;
3166 public Argument (Expression expr, AType type)
3172 public Expression Expr {
3182 public bool Resolve (TypeContainer tc)
3184 expr = expr.Resolve (tc);
3186 return expr != null;
3189 public void Emit (EmitContext ec)
3196 // Invocation of methods or delegates.
3198 public class Invocation : ExpressionStatement {
3199 public readonly ArrayList Arguments;
3200 public readonly Location Location;
3203 MethodBase method = null;
3205 static Hashtable method_parameter_cache;
3207 static Invocation ()
3209 method_parameter_cache = new Hashtable ();
3213 // arguments is an ArrayList, but we do not want to typecast,
3214 // as it might be null.
3216 // FIXME: only allow expr to be a method invocation or a
3217 // delegate invocation (7.5.5)
3219 public Invocation (Expression expr, ArrayList arguments, Location l)
3222 Arguments = arguments;
3226 public Expression Expr {
3233 // Returns the Parameters (a ParameterData interface) for the
3236 public static ParameterData GetParameterData (MethodBase mb)
3238 object pd = method_parameter_cache [mb];
3241 return (ParameterData) pd;
3243 if (mb is MethodBuilder || mb is ConstructorBuilder){
3244 MethodCore mc = TypeContainer.LookupMethodByBuilder (mb);
3246 InternalParameters ip = mc.ParameterInfo;
3247 method_parameter_cache [mb] = ip;
3249 return (ParameterData) ip;
3251 ParameterInfo [] pi = mb.GetParameters ();
3252 ReflectionParameters rp = new ReflectionParameters (pi);
3253 method_parameter_cache [mb] = rp;
3255 return (ParameterData) rp;
3260 // Tells whether a user defined conversion from Type `from' to
3261 // Type `to' exists.
3263 // FIXME: we could implement a cache here.
3265 static bool ConversionExists (TypeContainer tc, Type from, Type to)
3267 // Locate user-defined implicit operators
3271 mg = MemberLookup (tc, to, "op_Implicit", false);
3274 MethodGroupExpr me = (MethodGroupExpr) mg;
3276 for (int i = me.Methods.Length; i > 0;) {
3278 MethodBase mb = me.Methods [i];
3279 ParameterData pd = GetParameterData (mb);
3281 if (from == pd.ParameterType (0))
3286 mg = MemberLookup (tc, from, "op_Implicit", false);
3289 MethodGroupExpr me = (MethodGroupExpr) mg;
3291 for (int i = me.Methods.Length; i > 0;) {
3293 MethodBase mb = me.Methods [i];
3294 MethodInfo mi = (MethodInfo) mb;
3296 if (mi.ReturnType == to)
3305 // Determines "better conversion" as specified in 7.4.2.3
3306 // Returns : 1 if a->p is better
3307 // 0 if a->q or neither is better
3309 static int BetterConversion (TypeContainer tc, Argument a, Type p, Type q, bool use_standard)
3312 Type argument_type = a.Expr.Type;
3313 Expression argument_expr = a.Expr;
3315 if (argument_type == null)
3316 throw new Exception ("Expression of type " + a.Expr + " does not resolve its type");
3321 if (argument_type == p)
3324 if (argument_type == q)
3328 // Now probe whether an implicit constant expression conversion
3331 // An implicit constant expression conversion permits the following
3334 // * A constant-expression of type `int' can be converted to type
3335 // sbyte, byute, short, ushort, uint, ulong provided the value of
3336 // of the expression is withing the range of the destination type.
3338 // * A constant-expression of type long can be converted to type
3339 // ulong, provided the value of the constant expression is not negative
3341 // FIXME: Note that this assumes that constant folding has
3342 // taken place. We dont do constant folding yet.
3345 if (argument_expr is IntLiteral){
3346 IntLiteral ei = (IntLiteral) argument_expr;
3347 int value = ei.Value;
3349 if (p == TypeManager.sbyte_type){
3350 if (value >= SByte.MinValue && value <= SByte.MaxValue)
3352 } else if (p == TypeManager.byte_type){
3353 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
3355 } else if (p == TypeManager.short_type){
3356 if (value >= Int16.MinValue && value <= Int16.MaxValue)
3358 } else if (p == TypeManager.ushort_type){
3359 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
3361 } else if (p == TypeManager.uint32_type){
3363 // we can optimize this case: a positive int32
3364 // always fits on a uint32
3368 } else if (p == TypeManager.uint64_type){
3370 // we can optimize this case: a positive int32
3371 // always fits on a uint64
3376 } else if (argument_type == TypeManager.int64_type && argument_expr is LongLiteral){
3377 LongLiteral ll = (LongLiteral) argument_expr;
3379 if (p == TypeManager.uint64_type){
3390 tmp = ConvertImplicitStandard (tc, argument_expr, p, Location.Null);
3392 tmp = ConvertImplicit (tc, argument_expr, p, Location.Null);
3401 if (ConversionExists (tc, p, q) == true &&
3402 ConversionExists (tc, q, p) == false)
3405 if (p == TypeManager.sbyte_type)
3406 if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
3407 q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3410 if (p == TypeManager.short_type)
3411 if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
3412 q == TypeManager.uint64_type)
3415 if (p == TypeManager.int32_type)
3416 if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3419 if (p == TypeManager.int64_type)
3420 if (q == TypeManager.uint64_type)
3427 // Determines "Better function" and returns an integer indicating :
3428 // 0 if candidate ain't better
3429 // 1 if candidate is better than the current best match
3431 static int BetterFunction (TypeContainer tc, ArrayList args,
3432 MethodBase candidate, MethodBase best,
3435 ParameterData candidate_pd = GetParameterData (candidate);
3436 ParameterData best_pd;
3442 argument_count = args.Count;
3444 if (candidate_pd.Count == 0 && argument_count == 0)
3448 if (candidate_pd.Count == argument_count) {
3450 for (int j = argument_count; j > 0;) {
3453 Argument a = (Argument) args [j];
3455 x = BetterConversion (
3456 tc, a, candidate_pd.ParameterType (j), null,
3472 best_pd = GetParameterData (best);
3474 if (candidate_pd.Count == argument_count && best_pd.Count == argument_count) {
3475 int rating1 = 0, rating2 = 0;
3477 for (int j = argument_count; j > 0;) {
3481 Argument a = (Argument) args [j];
3483 x = BetterConversion (tc, a, candidate_pd.ParameterType (j),
3484 best_pd.ParameterType (j), use_standard);
3485 y = BetterConversion (tc, a, best_pd.ParameterType (j),
3486 candidate_pd.ParameterType (j), use_standard);
3492 if (rating1 > rating2)
3501 public static string FullMethodDesc (MethodBase mb)
3503 StringBuilder sb = new StringBuilder (mb.Name);
3504 ParameterData pd = GetParameterData (mb);
3507 for (int i = pd.Count; i > 0;) {
3509 sb.Append (TypeManager.CSharpName (pd.ParameterType (i)));
3515 return sb.ToString ();
3518 public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2)
3520 MemberInfo [] miset;
3521 MethodGroupExpr union;
3523 if (mg1 != null && mg2 != null) {
3525 MethodGroupExpr left_set = null, right_set = null;
3526 int length1 = 0, length2 = 0;
3528 left_set = (MethodGroupExpr) mg1;
3529 length1 = left_set.Methods.Length;
3531 right_set = (MethodGroupExpr) mg2;
3532 length2 = right_set.Methods.Length;
3534 ArrayList common = new ArrayList ();
3536 for (int i = 0; i < left_set.Methods.Length; i++) {
3537 for (int j = 0; j < right_set.Methods.Length; j++) {
3538 if (left_set.Methods [i] == right_set.Methods [j])
3539 common.Add (left_set.Methods [i]);
3543 miset = new MemberInfo [length1 + length2 - common.Count];
3545 left_set.Methods.CopyTo (miset, 0);
3549 for (int j = 0; j < right_set.Methods.Length; j++)
3550 if (!common.Contains (right_set.Methods [j]))
3551 miset [length1 + k++] = right_set.Methods [j];
3553 union = new MethodGroupExpr (miset);
3557 } else if (mg1 == null && mg2 != null) {
3559 MethodGroupExpr me = (MethodGroupExpr) mg2;
3561 miset = new MemberInfo [me.Methods.Length];
3562 me.Methods.CopyTo (miset, 0);
3564 union = new MethodGroupExpr (miset);
3568 } else if (mg2 == null && mg1 != null) {
3570 MethodGroupExpr me = (MethodGroupExpr) mg1;
3572 miset = new MemberInfo [me.Methods.Length];
3573 me.Methods.CopyTo (miset, 0);
3575 union = new MethodGroupExpr (miset);
3584 // Find the Applicable Function Members (7.4.2.1)
3586 // me: Method Group expression with the members to select.
3587 // it might contain constructors or methods (or anything
3588 // that maps to a method).
3590 // Arguments: ArrayList containing resolved Argument objects.
3592 // loc: The location if we want an error to be reported, or a Null
3593 // location for "probing" purposes.
3595 // inside_user_defined: controls whether OverloadResolve should use the
3596 // ConvertImplicit or ConvertImplicitStandard during overload resolution.
3598 // Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
3599 // that is the best match of me on Arguments.
3602 public static MethodBase OverloadResolve (TypeContainer tc, MethodGroupExpr me,
3603 ArrayList Arguments, Location loc,
3606 ArrayList afm = new ArrayList ();
3607 int best_match_idx = -1;
3608 MethodBase method = null;
3611 for (int i = me.Methods.Length; i > 0; ){
3613 MethodBase candidate = me.Methods [i];
3616 x = BetterFunction (tc, Arguments, candidate, method, use_standard);
3622 method = me.Methods [best_match_idx];
3626 if (Arguments == null)
3629 argument_count = Arguments.Count;
3633 // Now we see if we can at least find a method with the same number of arguments
3634 // and then try doing implicit conversion on the arguments
3635 if (best_match_idx == -1) {
3637 for (int i = me.Methods.Length; i > 0;) {
3639 MethodBase mb = me.Methods [i];
3640 pd = GetParameterData (mb);
3642 if (pd.Count == argument_count) {
3644 method = me.Methods [best_match_idx];
3655 // And now convert implicitly, each argument to the required type
3657 pd = GetParameterData (method);
3659 for (int j = argument_count; j > 0;) {
3661 Argument a = (Argument) Arguments [j];
3662 Expression a_expr = a.Expr;
3663 Type parameter_type = pd.ParameterType (j);
3665 if (a_expr.Type != parameter_type){
3669 conv = ConvertImplicitStandard (tc, a_expr, parameter_type,
3672 conv = ConvertImplicit (tc, a_expr, parameter_type,
3676 if (!Location.IsNull (loc)) {
3677 Error (tc, 1502, loc,
3678 "The best overloaded match for method '" + FullMethodDesc (method) +
3679 "' has some invalid arguments");
3680 Error (tc, 1503, loc,
3681 "Argument " + (j+1) +
3682 ": Cannot convert from '" + TypeManager.CSharpName (a_expr.Type)
3683 + "' to '" + TypeManager.CSharpName (pd.ParameterType (j)) + "'");
3688 // Update the argument with the implicit conversion
3698 public static MethodBase OverloadResolve (TypeContainer tc, MethodGroupExpr me,
3699 ArrayList Arguments, Location loc)
3701 return OverloadResolve (tc, me, Arguments, loc, false);
3704 public override Expression DoResolve (TypeContainer tc)
3707 // First, resolve the expression that is used to
3708 // trigger the invocation
3710 this.expr = expr.Resolve (tc);
3711 if (this.expr == null)
3714 if (!(this.expr is MethodGroupExpr)){
3715 report118 (tc, Location, this.expr, "method group");
3720 // Next, evaluate all the expressions in the argument list
3722 if (Arguments != null){
3723 for (int i = Arguments.Count; i > 0;){
3725 Argument a = (Argument) Arguments [i];
3727 if (!a.Resolve (tc))
3732 method = OverloadResolve (tc, (MethodGroupExpr) this.expr, Arguments,
3735 if (method == null){
3736 Error (tc, -6, Location,
3737 "Could not find any applicable function for this argument list");
3741 if (method is MethodInfo)
3742 type = ((MethodInfo)method).ReturnType;
3744 eclass = ExprClass.Value;
3748 public static void EmitArguments (EmitContext ec, MethodBase method, ArrayList Arguments)
3752 if (Arguments != null)
3753 top = Arguments.Count;
3757 for (int i = 0; i < top; i++){
3758 Argument a = (Argument) Arguments [i];
3764 public override void Emit (EmitContext ec)
3766 bool is_static = method.IsStatic;
3769 MethodGroupExpr mg = (MethodGroupExpr) this.expr;
3772 // If this is ourselves, push "this"
3774 if (mg.InstanceExpression == null){
3775 ec.ig.Emit (OpCodes.Ldarg_0);
3778 // Push the instance expression
3780 mg.InstanceExpression.Emit (ec);
3784 if (Arguments != null)
3785 EmitArguments (ec, method, Arguments);
3788 if (method is MethodInfo)
3789 ec.ig.Emit (OpCodes.Call, (MethodInfo) method);
3791 ec.ig.Emit (OpCodes.Call, (ConstructorInfo) method);
3793 if (method is MethodInfo)
3794 ec.ig.Emit (OpCodes.Callvirt, (MethodInfo) method);
3796 ec.ig.Emit (OpCodes.Callvirt, (ConstructorInfo) method);
3800 public override void EmitStatement (EmitContext ec)
3805 // Pop the return value if there is one
3807 if (method is MethodInfo){
3808 if (((MethodInfo)method).ReturnType != TypeManager.void_type)
3809 ec.ig.Emit (OpCodes.Pop);
3814 public class New : ExpressionStatement {
3821 public readonly NType NewType;
3822 public readonly ArrayList Arguments;
3823 public readonly string RequestedType;
3824 // These are for the case when we have an array
3825 public readonly string Rank;
3826 public readonly ArrayList Indices;
3827 public readonly ArrayList Initializers;
3830 MethodBase method = null;
3832 public New (string requested_type, ArrayList arguments, Location loc)
3834 RequestedType = requested_type;
3835 Arguments = arguments;
3836 NewType = NType.Object;
3840 public New (string requested_type, ArrayList exprs, string rank, ArrayList initializers, Location loc)
3842 RequestedType = requested_type;
3845 Initializers = initializers;
3846 NewType = NType.Array;
3850 public override Expression DoResolve (TypeContainer tc)
3852 type = tc.LookupType (RequestedType, false);
3859 ml = MemberLookup (tc, type, ".ctor", false,
3860 MemberTypes.Constructor, AllBindingsFlags);
3862 if (! (ml is MethodGroupExpr)){
3864 // FIXME: Find proper error
3866 report118 (tc, Location, ml, "method group");
3870 if (Arguments != null){
3871 for (int i = Arguments.Count; i > 0;){
3873 Argument a = (Argument) Arguments [i];
3875 if (!a.Resolve (tc))
3880 method = Invocation.OverloadResolve (tc, (MethodGroupExpr) ml, Arguments,
3883 if (method == null) {
3884 Error (tc, -6, Location,
3885 "New invocation: Can not find a constructor for this argument list");
3889 eclass = ExprClass.Value;
3893 public override void Emit (EmitContext ec)
3895 Invocation.EmitArguments (ec, method, Arguments);
3896 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
3899 public override void EmitStatement (EmitContext ec)
3902 ec.ig.Emit (OpCodes.Pop);
3907 // Represents the `this' construct
3909 public class This : Expression, LValue {
3910 public override Expression DoResolve (TypeContainer tc)
3912 eclass = ExprClass.Variable;
3913 type = tc.TypeBuilder;
3916 // FIXME: Verify that this is only used in instance contexts.
3921 public override void Emit (EmitContext ec)
3923 ec.ig.Emit (OpCodes.Ldarg_0);
3926 public void Store (EmitContext ec)
3929 // Assignment to the "this" variable.
3931 // FIXME: Apparently this is a bug that we
3932 // must catch as `this' seems to be readonly ;-)
3934 ec.ig.Emit (OpCodes.Starg, 0);
3937 public void AddressOf (EmitContext ec)
3939 ec.ig.Emit (OpCodes.Ldarga_S, (byte) 0);
3944 // Implements the typeof operator
3946 public class TypeOf : Expression {
3947 public readonly string QueriedType;
3950 public TypeOf (string queried_type)
3952 QueriedType = queried_type;
3955 public override Expression DoResolve (TypeContainer tc)
3957 typearg = tc.LookupType (QueriedType, false);
3959 if (typearg == null)
3962 type = TypeManager.type_type;
3963 eclass = ExprClass.Type;
3967 public override void Emit (EmitContext ec)
3969 ec.ig.Emit (OpCodes.Ldtoken, typearg);
3970 ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
3974 public class SizeOf : Expression {
3975 public readonly string QueriedType;
3977 public SizeOf (string queried_type)
3979 this.QueriedType = queried_type;
3982 public override Expression DoResolve (TypeContainer tc)
3984 // FIXME: Implement;
3985 throw new Exception ("Unimplemented");
3989 public override void Emit (EmitContext ec)
3991 throw new Exception ("Implement me");
3995 public class MemberAccess : Expression {
3996 public readonly string Identifier;
3998 Expression member_lookup;
4000 public MemberAccess (Expression expr, string id)
4006 public Expression Expr {
4012 public override Expression DoResolve (TypeContainer tc)
4014 Expression new_expression = expr.Resolve (tc);
4016 if (new_expression == null)
4019 member_lookup = MemberLookup (tc, expr.Type, Identifier, false);
4021 if (member_lookup is MethodGroupExpr){
4022 MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
4025 // Bind the instance expression to it
4027 // FIXME: This is a horrible way of detecting if it is
4028 // an instance expression. Figure out how to fix this.
4031 if (expr is LocalVariableReference ||
4032 expr is ParameterReference ||
4034 mg.InstanceExpression = expr;
4036 return member_lookup;
4037 } else if (member_lookup is FieldExpr){
4038 FieldExpr fe = (FieldExpr) member_lookup;
4042 return member_lookup;
4045 // FIXME: This should generate the proper node
4046 // ie, for a Property Access, it should like call it
4049 return member_lookup;
4052 public override void Emit (EmitContext ec)
4054 throw new Exception ("Should not happen I think");
4060 // Nodes of type Namespace are created during the semantic
4061 // analysis to resolve member_access/qualified_identifier/simple_name
4064 // They are born `resolved'.
4066 public class NamespaceExpr : Expression {
4067 public readonly string Name;
4069 public NamespaceExpr (string name)
4072 eclass = ExprClass.Namespace;
4075 public override Expression DoResolve (TypeContainer tc)
4080 public override void Emit (EmitContext ec)
4082 throw new Exception ("Namespace expressions should never be emitted");
4087 // Fully resolved expression that evaluates to a type
4089 public class TypeExpr : Expression {
4090 public TypeExpr (Type t)
4093 eclass = ExprClass.Type;
4096 override public Expression DoResolve (TypeContainer tc)
4101 override public void Emit (EmitContext ec)
4103 throw new Exception ("Implement me");
4108 // MethodGroup Expression.
4110 // This is a fully resolved expression that evaluates to a type
4112 public class MethodGroupExpr : Expression {
4113 public readonly MethodBase [] Methods;
4114 Expression instance_expression = null;
4116 public MethodGroupExpr (MemberInfo [] mi)
4118 Methods = new MethodBase [mi.Length];
4119 mi.CopyTo (Methods, 0);
4120 eclass = ExprClass.MethodGroup;
4124 // `A method group may have associated an instance expression'
4126 public Expression InstanceExpression {
4128 return instance_expression;
4132 instance_expression = value;
4136 override public Expression DoResolve (TypeContainer tc)
4141 override public void Emit (EmitContext ec)
4143 throw new Exception ("This should never be reached");
4147 // Fully resolved expression that evaluates to a Field
4149 public class FieldExpr : Expression, LValue {
4150 public readonly FieldInfo FieldInfo;
4151 public Expression Instance;
4153 public FieldExpr (FieldInfo fi)
4156 eclass = ExprClass.Variable;
4157 type = fi.FieldType;
4160 override public Expression DoResolve (TypeContainer tc)
4162 if (!FieldInfo.IsStatic){
4163 if (Instance == null){
4164 throw new Exception ("non-static FieldExpr without instance var\n" +
4165 "You have to assign the Instance variable\n" +
4166 "Of the FieldExpr to set this\n");
4169 Instance = Instance.Resolve (tc);
4170 if (Instance == null)
4177 override public void Emit (EmitContext ec)
4179 ILGenerator ig = ec.ig;
4181 if (FieldInfo.IsStatic)
4182 ig.Emit (OpCodes.Ldsfld, FieldInfo);
4186 ig.Emit (OpCodes.Ldfld, FieldInfo);
4190 public void Store (EmitContext ec)
4192 if (FieldInfo.IsStatic)
4193 ec.ig.Emit (OpCodes.Stsfld, FieldInfo);
4195 ec.ig.Emit (OpCodes.Stfld, FieldInfo);
4198 public void AddressOf (EmitContext ec)
4200 if (FieldInfo.IsStatic)
4201 ec.ig.Emit (OpCodes.Ldsflda, FieldInfo);
4204 ec.ig.Emit (OpCodes.Ldflda, FieldInfo);
4210 // Fully resolved expression that evaluates to a Property
4212 public class PropertyExpr : Expression {
4213 public readonly PropertyInfo PropertyInfo;
4214 public readonly bool IsStatic;
4216 public PropertyExpr (PropertyInfo pi)
4219 eclass = ExprClass.PropertyAccess;
4222 MethodBase [] acc = pi.GetAccessors ();
4224 for (int i = 0; i < acc.Length; i++)
4225 if (acc [i].IsStatic)
4228 type = pi.PropertyType;
4231 override public Expression DoResolve (TypeContainer tc)
4233 // We are born in resolved state.
4237 override public void Emit (EmitContext ec)
4239 // FIXME: Implement;
4240 throw new Exception ("Unimplemented");
4245 // Fully resolved expression that evaluates to a Expression
4247 public class EventExpr : Expression {
4248 public readonly EventInfo EventInfo;
4250 public EventExpr (EventInfo ei)
4253 eclass = ExprClass.EventAccess;
4256 override public Expression DoResolve (TypeContainer tc)
4258 // We are born in resolved state.
4262 override public void Emit (EmitContext ec)
4264 throw new Exception ("Implement me");
4265 // FIXME: Implement.
4269 public class CheckedExpr : Expression {
4271 public Expression Expr;
4273 public CheckedExpr (Expression e)
4278 public override Expression DoResolve (TypeContainer tc)
4280 Expr = Expr.Resolve (tc);
4285 eclass = Expr.ExprClass;
4290 public override void Emit (EmitContext ec)
4292 bool last_check = ec.CheckState;
4294 ec.CheckState = true;
4296 ec.CheckState = last_check;
4301 public class UnCheckedExpr : Expression {
4303 public Expression Expr;
4305 public UnCheckedExpr (Expression e)
4310 public override Expression DoResolve (TypeContainer tc)
4312 Expr = Expr.Resolve (tc);
4317 eclass = Expr.ExprClass;
4322 public override void Emit (EmitContext ec)
4324 bool last_check = ec.CheckState;
4326 ec.CheckState = false;
4328 ec.CheckState = last_check;
4333 public class ElementAccess : Expression {
4335 public readonly ArrayList Arguments;
4336 public readonly Expression Expr;
4338 public ElementAccess (Expression e, ArrayList e_list)
4344 public override Expression DoResolve (TypeContainer tc)
4346 // FIXME: Implement;
4347 throw new Exception ("Unimplemented");
4351 public override void Emit (EmitContext ec)
4353 // FIXME : Implement !
4354 throw new Exception ("Unimplemented");
4359 public class BaseAccess : Expression {
4361 public enum BaseAccessType {
4366 public readonly BaseAccessType BAType;
4367 public readonly string Member;
4368 public readonly ArrayList Arguments;
4370 public BaseAccess (BaseAccessType t, string member, ArrayList args)
4378 public override Expression DoResolve (TypeContainer tc)
4380 // FIXME: Implement;
4381 throw new Exception ("Unimplemented");
4385 public override void Emit (EmitContext ec)
4387 throw new Exception ("Unimplemented");
4391 public class UserCast : Expression {
4394 Type most_specific_source;
4395 Type most_specific_target;
4398 public UserCast (MethodInfo method, Expression source, Type most_specific_source,
4399 Type most_specific_target, bool is_explicit)
4401 this.method = method;
4402 this.source = source;
4403 this.most_specific_source = most_specific_source;
4404 this.most_specific_target = most_specific_target;
4405 this.is_explicit = is_explicit;
4406 type = method.ReturnType;
4407 eclass = ExprClass.Value;
4410 public override Expression DoResolve (TypeContainer tc)
4413 // We are born in a fully resolved state
4418 public override void Emit (EmitContext ec)
4420 ILGenerator ig = ec.ig;
4421 Location tmp = new Location (-1);
4423 // Note that operators are static anyway
4428 e = ConvertImplicitStandard (ec.parent, source, most_specific_source, tmp);
4430 e = ConvertExplicit (ec.parent, source, most_specific_source, tmp);
4434 if (method is MethodInfo)
4435 ig.Emit (OpCodes.Call, (MethodInfo) method);
4437 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
4440 // FIXME : Need to emit the right Opcode for conversion back to the
4441 // type expected by the actual expression. At this point, the type
4442 // of the value on the stack is obviously what the method returns
projects / mono.git / blob