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 (target, ret_type)) {
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);
928 if (most_specific_source == null)
932 most_specific_target = FindMostEncompassingType (tc, union, target);
934 if (most_specific_target == null)
940 for (int i = union.Methods.Length; i > 0;) {
943 MethodBase mb = union.Methods [i];
944 ParameterData pd = Invocation.GetParameterData (mb);
945 MethodInfo mi = (MethodInfo) union.Methods [i];
947 if (pd.ParameterType (0) == most_specific_source &&
948 mi.ReturnType == most_specific_target) {
954 if (method == null || count > 1) {
955 Report.Error (-11, l, "Ambiguous user defined conversion");
960 return new UserCast ((MethodInfo) method, source, most_specific_source,
961 most_specific_target, look_for_explicit);
969 // Converts implicitly the resolved expression `expr' into the
970 // `target_type'. It returns a new expression that can be used
971 // in a context that expects a `target_type'.
973 static public Expression ConvertImplicit (TypeContainer tc, Expression expr,
974 Type target_type, Location l)
976 Type expr_type = expr.Type;
979 if (expr_type == target_type)
982 e = ImplicitNumericConversion (tc, expr, target_type, l);
986 e = ImplicitReferenceConversion (expr, target_type);
990 e = ImplicitUserConversion (tc, expr, target_type, l);
994 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
995 IntLiteral i = (IntLiteral) expr;
998 return new EmptyCast (expr, target_type);
1006 // Attempts to apply the `Standard Implicit
1007 // Conversion' rules to the expression `expr' into
1008 // the `target_type'. It returns a new expression
1009 // that can be used in a context that expects a
1012 // This is different from `ConvertImplicit' in that the
1013 // user defined implicit conversions are excluded.
1015 static public Expression ConvertImplicitStandard (TypeContainer tc, Expression expr,
1016 Type target_type, Location l)
1018 Type expr_type = expr.Type;
1021 if (expr_type == target_type)
1024 e = ImplicitNumericConversion (tc, expr, target_type, l);
1028 e = ImplicitReferenceConversion (expr, target_type);
1032 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1033 IntLiteral i = (IntLiteral) expr;
1036 return new EmptyCast (expr, target_type);
1041 // Attemps to perform an implict constant conversion of the IntLiteral
1042 // into a different data type using casts (See Implicit Constant
1043 // Expression Conversions)
1045 static protected Expression TryImplicitIntConversion (Type target_type, IntLiteral il)
1047 int value = il.Value;
1049 if (target_type == TypeManager.sbyte_type){
1050 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1052 } else if (target_type == TypeManager.byte_type){
1053 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1055 } else if (target_type == TypeManager.short_type){
1056 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1058 } else if (target_type == TypeManager.ushort_type){
1059 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1061 } else if (target_type == TypeManager.uint32_type){
1063 // we can optimize this case: a positive int32
1064 // always fits on a uint32
1068 } else if (target_type == TypeManager.uint64_type){
1070 // we can optimize this case: a positive int32
1071 // always fits on a uint64. But we need an opcode
1075 return new OpcodeCast (il, target_type, OpCodes.Conv_I8);
1082 // Attemptes to implicityly convert `target' into `type', using
1083 // ConvertImplicit. If there is no implicit conversion, then
1084 // an error is signaled
1086 static public Expression ConvertImplicitRequired (TypeContainer tc, Expression target,
1087 Type type, Location l)
1091 e = ConvertImplicit (tc, target, type, l);
1095 string msg = "Can not convert implicitly from `"+
1096 TypeManager.CSharpName (target.Type) + "' to `" +
1097 TypeManager.CSharpName (type) + "'";
1099 Error (tc, 29, l, msg);
1105 // Performs the explicit numeric conversions
1107 static Expression ConvertNumericExplicit (TypeContainer tc, Expression expr,
1110 Type expr_type = expr.Type;
1112 if (expr_type == TypeManager.sbyte_type){
1114 // From sbyte to byte, ushort, uint, ulong, char
1116 if (target_type == TypeManager.byte_type)
1117 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1118 if (target_type == TypeManager.ushort_type)
1119 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1120 if (target_type == TypeManager.uint32_type)
1121 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1122 if (target_type == TypeManager.uint64_type)
1123 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1124 if (target_type == TypeManager.char_type)
1125 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1126 } else if (expr_type == TypeManager.byte_type){
1128 // From byte to sbyte and char
1130 if (target_type == TypeManager.sbyte_type)
1131 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1132 if (target_type == TypeManager.char_type)
1133 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1134 } else if (expr_type == TypeManager.short_type){
1136 // From short to sbyte, byte, ushort, uint, ulong, char
1138 if (target_type == TypeManager.sbyte_type)
1139 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1140 if (target_type == TypeManager.byte_type)
1141 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1142 if (target_type == TypeManager.ushort_type)
1143 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1144 if (target_type == TypeManager.uint32_type)
1145 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1146 if (target_type == TypeManager.uint64_type)
1147 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1148 if (target_type == TypeManager.char_type)
1149 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1150 } else if (expr_type == TypeManager.ushort_type){
1152 // From ushort to sbyte, byte, short, char
1154 if (target_type == TypeManager.sbyte_type)
1155 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1156 if (target_type == TypeManager.byte_type)
1157 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1158 if (target_type == TypeManager.short_type)
1159 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1160 if (target_type == TypeManager.char_type)
1161 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1162 } else if (expr_type == TypeManager.int32_type){
1164 // From int to sbyte, byte, short, ushort, uint, ulong, char
1166 if (target_type == TypeManager.sbyte_type)
1167 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1168 if (target_type == TypeManager.byte_type)
1169 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1170 if (target_type == TypeManager.short_type)
1171 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1172 if (target_type == TypeManager.ushort_type)
1173 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1174 if (target_type == TypeManager.uint32_type)
1175 return new EmptyCast (expr, target_type);
1176 if (target_type == TypeManager.uint64_type)
1177 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1178 if (target_type == TypeManager.char_type)
1179 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1180 } else if (expr_type == TypeManager.uint32_type){
1182 // From uint to sbyte, byte, short, ushort, int, char
1184 if (target_type == TypeManager.sbyte_type)
1185 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1186 if (target_type == TypeManager.byte_type)
1187 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1188 if (target_type == TypeManager.short_type)
1189 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1190 if (target_type == TypeManager.ushort_type)
1191 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1192 if (target_type == TypeManager.int32_type)
1193 return new EmptyCast (expr, target_type);
1194 if (target_type == TypeManager.char_type)
1195 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1196 } else if (expr_type == TypeManager.int64_type){
1198 // From long to sbyte, byte, short, ushort, int, uint, ulong, char
1200 if (target_type == TypeManager.sbyte_type)
1201 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1202 if (target_type == TypeManager.byte_type)
1203 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1204 if (target_type == TypeManager.short_type)
1205 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1206 if (target_type == TypeManager.ushort_type)
1207 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1208 if (target_type == TypeManager.int32_type)
1209 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1210 if (target_type == TypeManager.uint32_type)
1211 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1212 if (target_type == TypeManager.uint64_type)
1213 return new EmptyCast (expr, target_type);
1214 if (target_type == TypeManager.char_type)
1215 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1216 } else if (expr_type == TypeManager.uint64_type){
1218 // From ulong to sbyte, byte, short, ushort, int, uint, long, char
1220 if (target_type == TypeManager.sbyte_type)
1221 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1222 if (target_type == TypeManager.byte_type)
1223 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1224 if (target_type == TypeManager.short_type)
1225 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1226 if (target_type == TypeManager.ushort_type)
1227 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1228 if (target_type == TypeManager.int32_type)
1229 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1230 if (target_type == TypeManager.uint32_type)
1231 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1232 if (target_type == TypeManager.int64_type)
1233 return new EmptyCast (expr, target_type);
1234 if (target_type == TypeManager.char_type)
1235 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1236 } else if (expr_type == TypeManager.char_type){
1238 // From char to sbyte, byte, short
1240 if (target_type == TypeManager.sbyte_type)
1241 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1242 if (target_type == TypeManager.byte_type)
1243 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1244 if (target_type == TypeManager.short_type)
1245 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1246 } else if (expr_type == TypeManager.float_type){
1248 // From float to sbyte, byte, short,
1249 // ushort, int, uint, long, ulong, char
1252 if (target_type == TypeManager.sbyte_type)
1253 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1254 if (target_type == TypeManager.byte_type)
1255 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1256 if (target_type == TypeManager.short_type)
1257 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1258 if (target_type == TypeManager.ushort_type)
1259 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1260 if (target_type == TypeManager.int32_type)
1261 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1262 if (target_type == TypeManager.uint32_type)
1263 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1264 if (target_type == TypeManager.int64_type)
1265 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1266 if (target_type == TypeManager.uint64_type)
1267 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1268 if (target_type == TypeManager.char_type)
1269 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1270 if (target_type == TypeManager.decimal_type)
1271 return InternalTypeConstructor (tc, expr, target_type);
1272 } else if (expr_type == TypeManager.double_type){
1274 // From double to byte, byte, short,
1275 // ushort, int, uint, long, ulong,
1276 // char, float or decimal
1278 if (target_type == TypeManager.sbyte_type)
1279 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1280 if (target_type == TypeManager.byte_type)
1281 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1282 if (target_type == TypeManager.short_type)
1283 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1284 if (target_type == TypeManager.ushort_type)
1285 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1286 if (target_type == TypeManager.int32_type)
1287 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1288 if (target_type == TypeManager.uint32_type)
1289 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1290 if (target_type == TypeManager.int64_type)
1291 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1292 if (target_type == TypeManager.uint64_type)
1293 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1294 if (target_type == TypeManager.char_type)
1295 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1296 if (target_type == TypeManager.float_type)
1297 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
1298 if (target_type == TypeManager.decimal_type)
1299 return InternalTypeConstructor (tc, expr, target_type);
1302 // decimal is taken care of by the op_Explicit methods.
1308 // Implements Explicit Reference conversions
1310 static Expression ConvertReferenceExplicit (TypeContainer tc, Expression expr,
1313 Type expr_type = expr.Type;
1314 bool target_is_value_type = target_type.IsValueType;
1317 // From object to any reference type
1319 if (expr_type == TypeManager.object_type && !target_is_value_type)
1320 return new ClassCast (expr, expr_type);
1326 // Performs an explicit conversion of the expression `expr' whose
1327 // type is expr.Type to `target_type'.
1329 static public Expression ConvertExplicit (TypeContainer tc, Expression expr,
1330 Type target_type, Location l)
1332 Expression ne = ConvertImplicit (tc, expr, target_type, l);
1337 ne = ConvertNumericExplicit (tc, expr, target_type);
1341 ne = ConvertReferenceExplicit (tc, expr, target_type);
1345 ne = ExplicitUserConversion (tc, expr, target_type, l);
1349 Report.Error (30, l, "Cannot convert type '" + TypeManager.CSharpName (expr.Type) + "' to '"
1350 + TypeManager.CSharpName (target_type) + "'");
1354 static string ExprClassName (ExprClass c)
1357 case ExprClass.Invalid:
1359 case ExprClass.Value:
1361 case ExprClass.Variable:
1363 case ExprClass.Namespace:
1365 case ExprClass.Type:
1367 case ExprClass.MethodGroup:
1368 return "method group";
1369 case ExprClass.PropertyAccess:
1370 return "property access";
1371 case ExprClass.EventAccess:
1372 return "event access";
1373 case ExprClass.IndexerAccess:
1374 return "indexer access";
1375 case ExprClass.Nothing:
1378 throw new Exception ("Should not happen");
1382 // Reports that we were expecting `expr' to be of class `expected'
1384 protected void report118 (TypeContainer tc, Location l, Expression expr, string expected)
1386 string kind = "Unknown";
1389 kind = ExprClassName (expr.ExprClass);
1391 Error (tc, 118, l, "Expression denotes a '" + kind +
1392 "' where an " + expected + " was expected");
1397 // This is just a base class for expressions that can
1398 // appear on statements (invocations, object creation,
1399 // assignments, post/pre increment and decrement). The idea
1400 // being that they would support an extra Emition interface that
1401 // does not leave a result on the stack.
1404 public abstract class ExpressionStatement : Expression {
1407 // Requests the expression to be emitted in a `statement'
1408 // context. This means that no new value is left on the
1409 // stack after invoking this method (constrasted with
1410 // Emit that will always leave a value on the stack).
1412 public abstract void EmitStatement (EmitContext ec);
1416 // This kind of cast is used to encapsulate the child
1417 // whose type is child.Type into an expression that is
1418 // reported to return "return_type". This is used to encapsulate
1419 // expressions which have compatible types, but need to be dealt
1420 // at higher levels with.
1422 // For example, a "byte" expression could be encapsulated in one
1423 // of these as an "unsigned int". The type for the expression
1424 // would be "unsigned int".
1428 public class EmptyCast : Expression {
1429 protected Expression child;
1431 public EmptyCast (Expression child, Type return_type)
1433 ExprClass = child.ExprClass;
1438 public override Expression DoResolve (TypeContainer tc)
1440 // This should never be invoked, we are born in fully
1441 // initialized state.
1446 public override void Emit (EmitContext ec)
1453 // This kind of cast is used to encapsulate Value Types in objects.
1455 // The effect of it is to box the value type emitted by the previous
1458 public class BoxedCast : EmptyCast {
1460 public BoxedCast (Expression expr)
1461 : base (expr, TypeManager.object_type)
1465 public override Expression DoResolve (TypeContainer tc)
1467 // This should never be invoked, we are born in fully
1468 // initialized state.
1473 public override void Emit (EmitContext ec)
1476 ec.ig.Emit (OpCodes.Box, child.Type);
1481 // This kind of cast is used to encapsulate a child expression
1482 // that can be trivially converted to a target type using one or
1483 // two opcodes. The opcodes are passed as arguments.
1485 public class OpcodeCast : EmptyCast {
1489 public OpcodeCast (Expression child, Type return_type, OpCode op)
1490 : base (child, return_type)
1494 second_valid = false;
1497 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
1498 : base (child, return_type)
1503 second_valid = true;
1506 public override Expression DoResolve (TypeContainer tc)
1508 // This should never be invoked, we are born in fully
1509 // initialized state.
1514 public override void Emit (EmitContext ec)
1526 // This kind of cast is used to encapsulate a child and cast it
1527 // to the class requested
1529 public class ClassCast : EmptyCast {
1530 public ClassCast (Expression child, Type return_type)
1531 : base (child, return_type)
1536 public override Expression DoResolve (TypeContainer tc)
1538 // This should never be invoked, we are born in fully
1539 // initialized state.
1544 public override void Emit (EmitContext ec)
1548 ec.ig.Emit (OpCodes.Castclass, type);
1554 // Unary expressions.
1558 // Unary implements unary expressions. It derives from
1559 // ExpressionStatement becuase the pre/post increment/decrement
1560 // operators can be used in a statement context.
1562 public class Unary : ExpressionStatement {
1563 public enum Operator {
1564 Addition, Subtraction, Negate, BitComplement,
1565 Indirection, AddressOf, PreIncrement,
1566 PreDecrement, PostIncrement, PostDecrement
1571 ArrayList Arguments;
1575 public Unary (Operator op, Expression expr, Location loc)
1579 this.location = loc;
1582 public Expression Expr {
1592 public Operator Oper {
1603 // Returns a stringified representation of the Operator
1608 case Operator.Addition:
1610 case Operator.Subtraction:
1612 case Operator.Negate:
1614 case Operator.BitComplement:
1616 case Operator.AddressOf:
1618 case Operator.Indirection:
1620 case Operator.PreIncrement : case Operator.PostIncrement :
1622 case Operator.PreDecrement : case Operator.PostDecrement :
1626 return oper.ToString ();
1629 Expression ForceConversion (TypeContainer tc, Expression expr, Type target_type)
1631 if (expr.Type == target_type)
1634 return ConvertImplicit (tc, expr, target_type, new Location (-1));
1637 void error23 (TypeContainer tc, Type t)
1639 Report.Error (23, location, "Operator " + OperName () +
1640 " cannot be applied to operand of type `" +
1641 TypeManager.CSharpName (t) + "'");
1645 // Returns whether an object of type `t' can be incremented
1646 // or decremented with add/sub (ie, basically whether we can
1647 // use pre-post incr-decr operations on it, but it is not a
1648 // System.Decimal, which we test elsewhere)
1650 static bool IsIncrementableNumber (Type t)
1652 return (t == TypeManager.sbyte_type) ||
1653 (t == TypeManager.byte_type) ||
1654 (t == TypeManager.short_type) ||
1655 (t == TypeManager.ushort_type) ||
1656 (t == TypeManager.int32_type) ||
1657 (t == TypeManager.uint32_type) ||
1658 (t == TypeManager.int64_type) ||
1659 (t == TypeManager.uint64_type) ||
1660 (t == TypeManager.char_type) ||
1661 (t.IsSubclassOf (TypeManager.enum_type)) ||
1662 (t == TypeManager.float_type) ||
1663 (t == TypeManager.double_type);
1666 Expression ResolveOperator (TypeContainer tc)
1668 Type expr_type = expr.Type;
1671 // Step 1: Perform Operator Overload location
1676 if (oper == Operator.PostIncrement || oper == Operator.PreIncrement)
1677 op_name = "op_Increment";
1678 else if (oper == Operator.PostDecrement || oper == Operator.PreDecrement)
1679 op_name = "op_Decrement";
1681 op_name = "op_" + oper;
1683 mg = MemberLookup (tc, expr_type, op_name, false);
1685 if (mg == null && expr_type.BaseType != null)
1686 mg = MemberLookup (tc, expr_type.BaseType, op_name, false);
1689 Arguments = new ArrayList ();
1690 Arguments.Add (new Argument (expr, Argument.AType.Expression));
1692 method = Invocation.OverloadResolve (tc, (MethodGroupExpr) mg,
1693 Arguments, location);
1694 if (method != null) {
1695 MethodInfo mi = (MethodInfo) method;
1696 type = mi.ReturnType;
1699 error23 (tc, expr_type);
1706 // Step 2: Default operations on CLI native types.
1709 // Only perform numeric promotions on:
1712 if (expr_type == null)
1715 if (oper == Operator.Negate){
1716 if (expr_type != TypeManager.bool_type) {
1717 error23 (tc, expr.Type);
1721 type = TypeManager.bool_type;
1725 if (oper == Operator.BitComplement) {
1726 if (!((expr_type == TypeManager.int32_type) ||
1727 (expr_type == TypeManager.uint32_type) ||
1728 (expr_type == TypeManager.int64_type) ||
1729 (expr_type == TypeManager.uint64_type) ||
1730 (expr_type.IsSubclassOf (TypeManager.enum_type)))){
1731 error23 (tc, expr.Type);
1738 if (oper == Operator.Addition) {
1740 // A plus in front of something is just a no-op, so return the child.
1746 // Deals with -literals
1747 // int operator- (int x)
1748 // long operator- (long x)
1749 // float operator- (float f)
1750 // double operator- (double d)
1751 // decimal operator- (decimal d)
1753 if (oper == Operator.Subtraction){
1755 // Fold a "- Constant" into a negative constant
1758 Expression e = null;
1761 // Is this a constant?
1763 if (expr is IntLiteral)
1764 e = new IntLiteral (-((IntLiteral) expr).Value);
1765 else if (expr is LongLiteral)
1766 e = new LongLiteral (-((LongLiteral) expr).Value);
1767 else if (expr is FloatLiteral)
1768 e = new FloatLiteral (-((FloatLiteral) expr).Value);
1769 else if (expr is DoubleLiteral)
1770 e = new DoubleLiteral (-((DoubleLiteral) expr).Value);
1771 else if (expr is DecimalLiteral)
1772 e = new DecimalLiteral (-((DecimalLiteral) expr).Value);
1780 // Not a constant we can optimize, perform numeric
1781 // promotions to int, long, double.
1784 // The following is inneficient, because we call
1785 // ConvertImplicit too many times.
1787 // It is also not clear if we should convert to Float
1788 // or Double initially.
1790 Location l = new Location (-1);
1792 if (expr_type == TypeManager.uint32_type){
1794 // FIXME: handle exception to this rule that
1795 // permits the int value -2147483648 (-2^31) to
1796 // bt written as a decimal interger literal
1798 type = TypeManager.int64_type;
1799 expr = ConvertImplicit (tc, expr, type, l);
1803 if (expr_type == TypeManager.uint64_type){
1805 // FIXME: Handle exception of `long value'
1806 // -92233720368547758087 (-2^63) to be written as
1807 // decimal integer literal.
1809 error23 (tc, expr_type);
1813 e = ConvertImplicit (tc, expr, TypeManager.int32_type, l);
1820 e = ConvertImplicit (tc, expr, TypeManager.int64_type, l);
1827 e = ConvertImplicit (tc, expr, TypeManager.double_type, l);
1834 error23 (tc, expr_type);
1839 // The operand of the prefix/postfix increment decrement operators
1840 // should be an expression that is classified as a variable,
1841 // a property access or an indexer access
1843 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
1844 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
1845 if (expr.ExprClass == ExprClass.Variable){
1846 if (IsIncrementableNumber (expr_type) ||
1847 expr_type == TypeManager.decimal_type){
1851 } else if (expr.ExprClass == ExprClass.IndexerAccess){
1853 // FIXME: Verify that we have both get and set methods
1855 throw new Exception ("Implement me");
1856 } else if (expr.ExprClass == ExprClass.PropertyAccess){
1858 // FIXME: Verify that we have both get and set methods
1860 throw new Exception ("Implement me");
1862 report118 (tc, location, expr,
1863 "variable, indexer or property access");
1867 if (oper == Operator.AddressOf){
1868 if (expr.ExprClass != ExprClass.Variable){
1869 Error (tc, 211, "Cannot take the address of non-variables");
1872 type = Type.GetType (expr.Type.ToString () + "*");
1875 Error (tc, 187, "No such operator '" + OperName () + "' defined for type '" +
1876 TypeManager.CSharpName (expr_type) + "'");
1881 public override Expression DoResolve (TypeContainer tc)
1883 expr = expr.Resolve (tc);
1888 eclass = ExprClass.Value;
1889 return ResolveOperator (tc);
1892 public override void Emit (EmitContext ec)
1894 ILGenerator ig = ec.ig;
1895 Type expr_type = expr.Type;
1897 if (method != null) {
1899 // Note that operators are static anyway
1901 if (Arguments != null)
1902 Invocation.EmitArguments (ec, method, Arguments);
1905 // Post increment/decrement operations need a copy at this
1908 if (oper == Operator.PostDecrement || oper == Operator.PostIncrement)
1909 ig.Emit (OpCodes.Dup);
1912 ig.Emit (OpCodes.Call, (MethodInfo) method);
1915 // Pre Increment and Decrement operators
1917 if (oper == Operator.PreIncrement || oper == Operator.PreDecrement){
1918 ig.Emit (OpCodes.Dup);
1922 // Increment and Decrement should store the result
1924 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
1925 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
1926 ((LValue) expr).Store (ec);
1932 case Operator.Addition:
1933 throw new Exception ("This should be caught by Resolve");
1935 case Operator.Subtraction:
1937 ig.Emit (OpCodes.Neg);
1940 case Operator.Negate:
1942 ig.Emit (OpCodes.Ldc_I4_0);
1943 ig.Emit (OpCodes.Ceq);
1946 case Operator.BitComplement:
1948 ig.Emit (OpCodes.Not);
1951 case Operator.AddressOf:
1952 ((LValue)expr).AddressOf (ec);
1955 case Operator.Indirection:
1956 throw new Exception ("Not implemented yet");
1958 case Operator.PreIncrement:
1959 case Operator.PreDecrement:
1960 if (expr.ExprClass == ExprClass.Variable){
1962 // Resolve already verified that it is an "incrementable"
1965 ig.Emit (OpCodes.Ldc_I4_1);
1967 if (oper == Operator.PreDecrement)
1968 ig.Emit (OpCodes.Sub);
1970 ig.Emit (OpCodes.Add);
1971 ig.Emit (OpCodes.Dup);
1972 ((LValue) expr).Store (ec);
1974 throw new Exception ("Handle Indexers and Properties here");
1978 case Operator.PostIncrement:
1979 case Operator.PostDecrement:
1980 if (expr.ExprClass == ExprClass.Variable){
1982 // Resolve already verified that it is an "incrementable"
1985 ig.Emit (OpCodes.Dup);
1986 ig.Emit (OpCodes.Ldc_I4_1);
1988 if (oper == Operator.PostDecrement)
1989 ig.Emit (OpCodes.Sub);
1991 ig.Emit (OpCodes.Add);
1992 ((LValue) expr).Store (ec);
1994 throw new Exception ("Handle Indexers and Properties here");
1999 throw new Exception ("This should not happen: Operator = "
2000 + oper.ToString ());
2005 public override void EmitStatement (EmitContext ec)
2008 // FIXME: we should rewrite this code to generate
2009 // better code for ++ and -- as we know we wont need
2010 // the values on the stack
2013 ec.ig.Emit (OpCodes.Pop);
2017 public class Probe : Expression {
2018 public readonly string ProbeType;
2019 public readonly Operator Oper;
2023 public enum Operator {
2027 public Probe (Operator oper, Expression expr, string probe_type)
2030 ProbeType = probe_type;
2034 public Expression Expr {
2040 public override Expression DoResolve (TypeContainer tc)
2042 probe_type = tc.LookupType (ProbeType, false);
2044 if (probe_type == null)
2047 expr = expr.Resolve (tc);
2049 type = TypeManager.bool_type;
2050 eclass = ExprClass.Value;
2055 public override void Emit (EmitContext ec)
2057 ILGenerator ig = ec.ig;
2061 if (Oper == Operator.Is){
2062 ig.Emit (OpCodes.Isinst, probe_type);
2063 ig.Emit (OpCodes.Ldnull);
2064 ig.Emit (OpCodes.Cgt_Un);
2066 ig.Emit (OpCodes.Isinst, probe_type);
2072 // This represents a typecast in the source language.
2074 // FIXME: Cast expressions have an unusual set of parsing
2075 // rules, we need to figure those out.
2077 public class Cast : Expression {
2082 public Cast (string cast_type, Expression expr, Location loc)
2084 this.target_type = cast_type;
2086 this.location = loc;
2089 public string TargetType {
2095 public Expression Expr {
2104 public override Expression DoResolve (TypeContainer tc)
2106 expr = expr.Resolve (tc);
2110 type = tc.LookupType (target_type, false);
2111 eclass = ExprClass.Value;
2116 expr = ConvertExplicit (tc, expr, type, location);
2121 public override void Emit (EmitContext ec)
2124 // This one will never happen
2126 throw new Exception ("Should not happen");
2130 public class Binary : Expression {
2131 public enum Operator {
2132 Multiply, Division, Modulus,
2133 Addition, Subtraction,
2134 LeftShift, RightShift,
2135 LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
2136 Equality, Inequality,
2145 Expression left, right;
2147 ArrayList Arguments;
2151 public Binary (Operator oper, Expression left, Expression right, Location loc)
2156 this.location = loc;
2159 public Operator Oper {
2168 public Expression Left {
2177 public Expression Right {
2188 // Returns a stringified representation of the Operator
2193 case Operator.Multiply:
2195 case Operator.Division:
2197 case Operator.Modulus:
2199 case Operator.Addition:
2201 case Operator.Subtraction:
2203 case Operator.LeftShift:
2205 case Operator.RightShift:
2207 case Operator.LessThan:
2209 case Operator.GreaterThan:
2211 case Operator.LessThanOrEqual:
2213 case Operator.GreaterThanOrEqual:
2215 case Operator.Equality:
2217 case Operator.Inequality:
2219 case Operator.BitwiseAnd:
2221 case Operator.BitwiseOr:
2223 case Operator.ExclusiveOr:
2225 case Operator.LogicalOr:
2227 case Operator.LogicalAnd:
2231 return oper.ToString ();
2234 Expression ForceConversion (TypeContainer tc, Expression expr, Type target_type)
2236 if (expr.Type == target_type)
2239 return ConvertImplicit (tc, expr, target_type, new Location (-1));
2243 // Note that handling the case l == Decimal || r == Decimal
2244 // is taken care of by the Step 1 Operator Overload resolution.
2246 void DoNumericPromotions (TypeContainer tc, Type l, Type r)
2248 if (l == TypeManager.double_type || r == TypeManager.double_type){
2250 // If either operand is of type double, the other operand is
2251 // conveted to type double.
2253 if (r != TypeManager.double_type)
2254 right = ConvertImplicit (tc, right, TypeManager.double_type, location);
2255 if (l != TypeManager.double_type)
2256 left = ConvertImplicit (tc, left, TypeManager.double_type, location);
2258 type = TypeManager.double_type;
2259 } else if (l == TypeManager.float_type || r == TypeManager.float_type){
2261 // if either operand is of type float, th eother operand is
2262 // converd to type float.
2264 if (r != TypeManager.double_type)
2265 right = ConvertImplicit (tc, right, TypeManager.float_type, location);
2266 if (l != TypeManager.double_type)
2267 left = ConvertImplicit (tc, left, TypeManager.float_type, location);
2268 type = TypeManager.float_type;
2269 } else if (l == TypeManager.uint64_type || r == TypeManager.uint64_type){
2273 // If either operand is of type ulong, the other operand is
2274 // converted to type ulong. or an error ocurrs if the other
2275 // operand is of type sbyte, short, int or long
2278 if (l == TypeManager.uint64_type){
2279 if (r != TypeManager.uint64_type && right is IntLiteral){
2280 e = TryImplicitIntConversion (l, (IntLiteral) right);
2286 if (left is IntLiteral){
2287 e = TryImplicitIntConversion (r, (IntLiteral) left);
2294 if ((other == TypeManager.sbyte_type) ||
2295 (other == TypeManager.short_type) ||
2296 (other == TypeManager.int32_type) ||
2297 (other == TypeManager.int64_type)){
2298 string oper = OperName ();
2300 Error (tc, 34, location, "Operator `" + OperName ()
2301 + "' is ambiguous on operands of type `"
2302 + TypeManager.CSharpName (l) + "' "
2303 + "and `" + TypeManager.CSharpName (r)
2306 type = TypeManager.uint64_type;
2307 } else if (l == TypeManager.int64_type || r == TypeManager.int64_type){
2309 // If either operand is of type long, the other operand is converted
2312 if (l != TypeManager.int64_type)
2313 left = ConvertImplicit (tc, left, TypeManager.int64_type, location);
2314 if (r != TypeManager.int64_type)
2315 right = ConvertImplicit (tc, right, TypeManager.int64_type, location);
2317 type = TypeManager.int64_type;
2318 } else if (l == TypeManager.uint32_type || r == TypeManager.uint32_type){
2320 // If either operand is of type uint, and the other
2321 // operand is of type sbyte, short or int, othe operands are
2322 // converted to type long.
2326 if (l == TypeManager.uint32_type)
2328 else if (r == TypeManager.uint32_type)
2331 if ((other == TypeManager.sbyte_type) ||
2332 (other == TypeManager.short_type) ||
2333 (other == TypeManager.int32_type)){
2334 left = ForceConversion (tc, left, TypeManager.int64_type);
2335 right = ForceConversion (tc, right, TypeManager.int64_type);
2336 type = TypeManager.int64_type;
2339 // if either operand is of type uint, the other
2340 // operand is converd to type uint
2342 left = ForceConversion (tc, left, TypeManager.uint32_type);
2343 right = ForceConversion (tc, right, TypeManager.uint32_type);
2344 type = TypeManager.uint32_type;
2346 } else if (l == TypeManager.decimal_type || r == TypeManager.decimal_type){
2347 if (l != TypeManager.decimal_type)
2348 left = ConvertImplicit (tc, left, TypeManager.decimal_type, location);
2349 if (r != TypeManager.decimal_type)
2350 right = ConvertImplicit (tc, right, TypeManager.decimal_type, location);
2352 type = TypeManager.decimal_type;
2354 Expression l_tmp, r_tmp;
2356 l_tmp = ForceConversion (tc, left, TypeManager.int32_type);
2357 if (l_tmp == null) {
2363 r_tmp = ForceConversion (tc, right, TypeManager.int32_type);
2364 if (r_tmp == null) {
2370 type = TypeManager.int32_type;
2374 void error19 (TypeContainer tc)
2376 Error (tc, 19, location,
2377 "Operator " + OperName () + " cannot be applied to operands of type `" +
2378 TypeManager.CSharpName (left.Type) + "' and `" +
2379 TypeManager.CSharpName (right.Type) + "'");
2383 Expression CheckShiftArguments (TypeContainer tc)
2387 Type r = right.Type;
2389 e = ForceConversion (tc, right, TypeManager.int32_type);
2396 Location loc = location;
2398 if (((e = ConvertImplicit (tc, left, TypeManager.int32_type, loc)) != null) ||
2399 ((e = ConvertImplicit (tc, left, TypeManager.uint32_type, loc)) != null) ||
2400 ((e = ConvertImplicit (tc, left, TypeManager.int64_type, loc)) != null) ||
2401 ((e = ConvertImplicit (tc, left, TypeManager.uint64_type, loc)) != null)){
2411 Expression ResolveOperator (TypeContainer tc)
2414 Type r = right.Type;
2417 // Step 1: Perform Operator Overload location
2419 Expression left_expr, right_expr;
2421 string op = "op_" + oper;
2423 left_expr = MemberLookup (tc, l, op, false);
2424 if (left_expr == null && l.BaseType != null)
2425 left_expr = MemberLookup (tc, l.BaseType, op, false);
2427 right_expr = MemberLookup (tc, r, op, false);
2428 if (right_expr == null && r.BaseType != null)
2429 right_expr = MemberLookup (tc, r.BaseType, op, false);
2431 MethodGroupExpr union = Invocation.MakeUnionSet (left_expr, right_expr);
2433 if (union != null) {
2434 Arguments = new ArrayList ();
2435 Arguments.Add (new Argument (left, Argument.AType.Expression));
2436 Arguments.Add (new Argument (right, Argument.AType.Expression));
2438 method = Invocation.OverloadResolve (tc, union, Arguments, location);
2439 if (method != null) {
2440 MethodInfo mi = (MethodInfo) method;
2441 type = mi.ReturnType;
2450 // Step 2: Default operations on CLI native types.
2453 // Only perform numeric promotions on:
2454 // +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
2456 if (oper == Operator.Addition){
2458 // If any of the arguments is a string, cast to string
2460 if (l == TypeManager.string_type){
2461 if (r == TypeManager.string_type){
2463 method = TypeManager.string_concat_string_string;
2466 method = TypeManager.string_concat_object_object;
2467 right = ConvertImplicit (tc, right,
2468 TypeManager.object_type, location);
2470 type = TypeManager.string_type;
2472 Arguments = new ArrayList ();
2473 Arguments.Add (new Argument (left, Argument.AType.Expression));
2474 Arguments.Add (new Argument (right, Argument.AType.Expression));
2478 } else if (r == TypeManager.string_type){
2480 method = TypeManager.string_concat_object_object;
2481 Arguments = new ArrayList ();
2482 Arguments.Add (new Argument (left, Argument.AType.Expression));
2483 Arguments.Add (new Argument (right, Argument.AType.Expression));
2485 left = ConvertImplicit (tc, left, TypeManager.object_type, location);
2486 type = TypeManager.string_type;
2492 // FIXME: is Delegate operator + (D x, D y) handled?
2496 if (oper == Operator.LeftShift || oper == Operator.RightShift)
2497 return CheckShiftArguments (tc);
2499 if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
2500 if (l != TypeManager.bool_type || r != TypeManager.bool_type)
2503 type = TypeManager.bool_type;
2508 // We are dealing with numbers
2511 DoNumericPromotions (tc, l, r);
2513 if (left == null || right == null)
2517 if (oper == Operator.BitwiseAnd ||
2518 oper == Operator.BitwiseOr ||
2519 oper == Operator.ExclusiveOr){
2520 if (!((l == TypeManager.int32_type) ||
2521 (l == TypeManager.uint32_type) ||
2522 (l == TypeManager.int64_type) ||
2523 (l == TypeManager.uint64_type))){
2530 if (oper == Operator.Equality ||
2531 oper == Operator.Inequality ||
2532 oper == Operator.LessThanOrEqual ||
2533 oper == Operator.LessThan ||
2534 oper == Operator.GreaterThanOrEqual ||
2535 oper == Operator.GreaterThan){
2536 type = TypeManager.bool_type;
2542 public override Expression DoResolve (TypeContainer tc)
2544 left = left.Resolve (tc);
2545 right = right.Resolve (tc);
2547 if (left == null || right == null)
2550 if (left.Type == null)
2551 throw new Exception (
2552 "Resolve returned non null, but did not set the type! (" +
2554 if (right.Type == null)
2555 throw new Exception (
2556 "Resolve returned non null, but did not set the type! (" +
2559 eclass = ExprClass.Value;
2561 return ResolveOperator (tc);
2564 public bool IsBranchable ()
2566 if (oper == Operator.Equality ||
2567 oper == Operator.Inequality ||
2568 oper == Operator.LessThan ||
2569 oper == Operator.GreaterThan ||
2570 oper == Operator.LessThanOrEqual ||
2571 oper == Operator.GreaterThanOrEqual){
2578 // This entry point is used by routines that might want
2579 // to emit a brfalse/brtrue after an expression, and instead
2580 // they could use a more compact notation.
2582 // Typically the code would generate l.emit/r.emit, followed
2583 // by the comparission and then a brtrue/brfalse. The comparissions
2584 // are sometimes inneficient (there are not as complete as the branches
2585 // look for the hacks in Emit using double ceqs).
2587 // So for those cases we provide EmitBranchable that can emit the
2588 // branch with the test
2590 public void EmitBranchable (EmitContext ec, int target)
2593 bool close_target = false;
2599 case Operator.Equality:
2601 opcode = OpCodes.Beq_S;
2603 opcode = OpCodes.Beq;
2606 case Operator.Inequality:
2608 opcode = OpCodes.Bne_Un_S;
2610 opcode = OpCodes.Bne_Un;
2613 case Operator.LessThan:
2615 opcode = OpCodes.Blt_S;
2617 opcode = OpCodes.Blt;
2620 case Operator.GreaterThan:
2622 opcode = OpCodes.Bgt_S;
2624 opcode = OpCodes.Bgt;
2627 case Operator.LessThanOrEqual:
2629 opcode = OpCodes.Ble_S;
2631 opcode = OpCodes.Ble;
2634 case Operator.GreaterThanOrEqual:
2636 opcode = OpCodes.Bge_S;
2638 opcode = OpCodes.Ble;
2642 throw new Exception ("EmitBranchable called on non-EmitBranchable operator: "
2643 + oper.ToString ());
2646 ec.ig.Emit (opcode, target);
2649 public override void Emit (EmitContext ec)
2651 ILGenerator ig = ec.ig;
2653 Type r = right.Type;
2656 if (method != null) {
2658 // Note that operators are static anyway
2660 if (Arguments != null)
2661 Invocation.EmitArguments (ec, method, Arguments);
2663 if (method is MethodInfo)
2664 ig.Emit (OpCodes.Call, (MethodInfo) method);
2666 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
2675 case Operator.Multiply:
2677 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2678 opcode = OpCodes.Mul_Ovf;
2679 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2680 opcode = OpCodes.Mul_Ovf_Un;
2682 opcode = OpCodes.Mul;
2684 opcode = OpCodes.Mul;
2688 case Operator.Division:
2689 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2690 opcode = OpCodes.Div_Un;
2692 opcode = OpCodes.Div;
2695 case Operator.Modulus:
2696 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2697 opcode = OpCodes.Rem_Un;
2699 opcode = OpCodes.Rem;
2702 case Operator.Addition:
2704 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2705 opcode = OpCodes.Add_Ovf;
2706 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2707 opcode = OpCodes.Add_Ovf_Un;
2709 opcode = OpCodes.Mul;
2711 opcode = OpCodes.Add;
2714 case Operator.Subtraction:
2716 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2717 opcode = OpCodes.Sub_Ovf;
2718 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2719 opcode = OpCodes.Sub_Ovf_Un;
2721 opcode = OpCodes.Sub;
2723 opcode = OpCodes.Sub;
2726 case Operator.RightShift:
2727 opcode = OpCodes.Shr;
2730 case Operator.LeftShift:
2731 opcode = OpCodes.Shl;
2734 case Operator.Equality:
2735 opcode = OpCodes.Ceq;
2738 case Operator.Inequality:
2739 ec.ig.Emit (OpCodes.Ceq);
2740 ec.ig.Emit (OpCodes.Ldc_I4_0);
2742 opcode = OpCodes.Ceq;
2745 case Operator.LessThan:
2746 opcode = OpCodes.Clt;
2749 case Operator.GreaterThan:
2750 opcode = OpCodes.Cgt;
2753 case Operator.LessThanOrEqual:
2754 ec.ig.Emit (OpCodes.Cgt);
2755 ec.ig.Emit (OpCodes.Ldc_I4_0);
2757 opcode = OpCodes.Ceq;
2760 case Operator.GreaterThanOrEqual:
2761 ec.ig.Emit (OpCodes.Clt);
2762 ec.ig.Emit (OpCodes.Ldc_I4_1);
2764 opcode = OpCodes.Sub;
2767 case Operator.LogicalOr:
2768 case Operator.BitwiseOr:
2769 opcode = OpCodes.Or;
2772 case Operator.LogicalAnd:
2773 case Operator.BitwiseAnd:
2774 opcode = OpCodes.And;
2777 case Operator.ExclusiveOr:
2778 opcode = OpCodes.Xor;
2782 throw new Exception ("This should not happen: Operator = "
2783 + oper.ToString ());
2790 public class Conditional : Expression {
2791 Expression expr, trueExpr, falseExpr;
2794 public Conditional (Expression expr, Expression trueExpr, Expression falseExpr, Location l)
2797 this.trueExpr = trueExpr;
2798 this.falseExpr = falseExpr;
2802 public Expression Expr {
2808 public Expression TrueExpr {
2814 public Expression FalseExpr {
2820 public override Expression DoResolve (TypeContainer tc)
2822 expr = expr.Resolve (tc);
2824 if (expr.Type != TypeManager.bool_type)
2825 expr = Expression.ConvertImplicitRequired (
2826 tc, expr, TypeManager.bool_type, l);
2828 trueExpr = trueExpr.Resolve (tc);
2829 falseExpr = falseExpr.Resolve (tc);
2831 if (expr == null || trueExpr == null || falseExpr == null)
2834 if (trueExpr.Type == falseExpr.Type)
2835 type = trueExpr.Type;
2840 // First, if an implicit conversion exists from trueExpr
2841 // to falseExpr, then the result type is of type falseExpr.Type
2843 conv = ConvertImplicit (tc, trueExpr, falseExpr.Type, l);
2845 type = falseExpr.Type;
2847 } else if ((conv = ConvertImplicit (tc,falseExpr,trueExpr.Type,l)) != null){
2848 type = trueExpr.Type;
2851 Error (tc, 173, l, "The type of the conditional expression can " +
2852 "not be computed because there is no implicit conversion" +
2853 " from `" + TypeManager.CSharpName (trueExpr.Type) + "'" +
2854 " and `" + TypeManager.CSharpName (falseExpr.Type) + "'");
2859 eclass = ExprClass.Value;
2863 public override void Emit (EmitContext ec)
2865 ILGenerator ig = ec.ig;
2866 Label false_target = ig.DefineLabel ();
2867 Label end_target = ig.DefineLabel ();
2870 ig.Emit (OpCodes.Brfalse, false_target);
2872 ig.Emit (OpCodes.Br, end_target);
2873 ig.MarkLabel (false_target);
2874 falseExpr.Emit (ec);
2875 ig.MarkLabel (end_target);
2879 public class SimpleName : Expression {
2880 public readonly string Name;
2881 public readonly Location Location;
2883 public SimpleName (string name, Location l)
2890 // Checks whether we are trying to access an instance
2891 // property, method or field from a static body.
2893 Expression MemberStaticCheck (Expression e)
2895 if (e is FieldExpr){
2896 FieldInfo fi = ((FieldExpr) e).FieldInfo;
2901 "An object reference is required " +
2902 "for the non-static field `"+Name+"'");
2905 } else if (e is MethodGroupExpr){
2906 // FIXME: Pending reorganization of MemberLookup
2907 // Basically at this point we should have the
2908 // best match already selected for us, and
2909 // we should only have to check a *single*
2910 // Method for its static on/off bit.
2912 } else if (e is PropertyExpr){
2913 if (!((PropertyExpr) e).IsStatic){
2915 "An object reference is required " +
2916 "for the non-static property access `"+
2926 // 7.5.2: Simple Names.
2928 // Local Variables and Parameters are handled at
2929 // parse time, so they never occur as SimpleNames.
2931 Expression ResolveSimpleName (TypeContainer tc)
2935 e = MemberLookup (tc, tc.TypeBuilder, Name, true);
2939 else if (e is FieldExpr){
2940 FieldExpr fe = (FieldExpr) e;
2942 if (!fe.FieldInfo.IsStatic)
2943 fe.Instance = new This ();
2946 if ((tc.ModFlags & Modifiers.STATIC) != 0)
2947 return MemberStaticCheck (e);
2953 // Do step 3 of the Simple Name resolution.
2955 // FIXME: implement me.
2957 Error (tc, 103, Location, "The name `" + Name + "' does not exist in the class `" +
2964 // SimpleName needs to handle a multitude of cases:
2966 // simple_names and qualified_identifiers are placed on
2967 // the tree equally.
2969 public override Expression DoResolve (TypeContainer tc)
2971 if (Name.IndexOf (".") != -1)
2972 return ResolveMemberAccess (tc, Name);
2974 return ResolveSimpleName (tc);
2977 public override void Emit (EmitContext ec)
2979 throw new Exception ("SimpleNames should be gone from the tree");
2984 // A simple interface that should be implemeneted by LValues
2986 public interface LValue {
2989 // The Store method should store the contents of the top
2990 // of the stack into the storage that is implemented by
2991 // the particular implementation of LValue
2993 void Store (EmitContext ec);
2996 // The AddressOf method should generate code that loads
2997 // the address of the LValue and leaves it on the stack
2999 void AddressOf (EmitContext ec);
3002 public class LocalVariableReference : Expression, LValue {
3003 public readonly string Name;
3004 public readonly Block Block;
3006 public LocalVariableReference (Block block, string name)
3010 eclass = ExprClass.Variable;
3013 public VariableInfo VariableInfo {
3015 return Block.GetVariableInfo (Name);
3019 public override Expression DoResolve (TypeContainer tc)
3021 VariableInfo vi = Block.GetVariableInfo (Name);
3023 type = vi.VariableType;
3027 public override void Emit (EmitContext ec)
3029 VariableInfo vi = VariableInfo;
3030 ILGenerator ig = ec.ig;
3037 ig.Emit (OpCodes.Ldloc_0);
3041 ig.Emit (OpCodes.Ldloc_1);
3045 ig.Emit (OpCodes.Ldloc_2);
3049 ig.Emit (OpCodes.Ldloc_3);
3054 ig.Emit (OpCodes.Ldloc_S, (byte) idx);
3056 ig.Emit (OpCodes.Ldloc, idx);
3061 public void Store (EmitContext ec)
3063 ILGenerator ig = ec.ig;
3064 VariableInfo vi = VariableInfo;
3070 ig.Emit (OpCodes.Stloc_0);
3074 ig.Emit (OpCodes.Stloc_1);
3078 ig.Emit (OpCodes.Stloc_2);
3082 ig.Emit (OpCodes.Stloc_3);
3087 ig.Emit (OpCodes.Stloc_S, (byte) idx);
3089 ig.Emit (OpCodes.Stloc, idx);
3094 public void AddressOf (EmitContext ec)
3096 VariableInfo vi = VariableInfo;
3103 ec.ig.Emit (OpCodes.Ldloca_S, (byte) idx);
3105 ec.ig.Emit (OpCodes.Ldloca, idx);
3109 public class ParameterReference : Expression, LValue {
3110 public readonly Parameters Pars;
3111 public readonly String Name;
3112 public readonly int Idx;
3114 public ParameterReference (Parameters pars, int idx, string name)
3119 eclass = ExprClass.Variable;
3122 public override Expression DoResolve (TypeContainer tc)
3124 Type [] types = Pars.GetParameterInfo (tc);
3131 public override void Emit (EmitContext ec)
3134 ec.ig.Emit (OpCodes.Ldarg_S, (byte) Idx);
3136 ec.ig.Emit (OpCodes.Ldarg, Idx);
3139 public void Store (EmitContext ec)
3142 ec.ig.Emit (OpCodes.Starg_S, (byte) Idx);
3144 ec.ig.Emit (OpCodes.Starg, Idx);
3148 public void AddressOf (EmitContext ec)
3151 ec.ig.Emit (OpCodes.Ldarga_S, (byte) Idx);
3153 ec.ig.Emit (OpCodes.Ldarga, Idx);
3158 // Used for arguments to New(), Invocation()
3160 public class Argument {
3167 public readonly AType Type;
3170 public Argument (Expression expr, AType type)
3176 public Expression Expr {
3186 public bool Resolve (TypeContainer tc)
3188 expr = expr.Resolve (tc);
3190 return expr != null;
3193 public void Emit (EmitContext ec)
3200 // Invocation of methods or delegates.
3202 public class Invocation : ExpressionStatement {
3203 public readonly ArrayList Arguments;
3204 public readonly Location Location;
3207 MethodBase method = null;
3209 static Hashtable method_parameter_cache;
3211 static Invocation ()
3213 method_parameter_cache = new Hashtable ();
3217 // arguments is an ArrayList, but we do not want to typecast,
3218 // as it might be null.
3220 // FIXME: only allow expr to be a method invocation or a
3221 // delegate invocation (7.5.5)
3223 public Invocation (Expression expr, ArrayList arguments, Location l)
3226 Arguments = arguments;
3230 public Expression Expr {
3237 // Returns the Parameters (a ParameterData interface) for the
3240 public static ParameterData GetParameterData (MethodBase mb)
3242 object pd = method_parameter_cache [mb];
3245 return (ParameterData) pd;
3247 if (mb is MethodBuilder || mb is ConstructorBuilder){
3248 MethodCore mc = TypeContainer.LookupMethodByBuilder (mb);
3250 InternalParameters ip = mc.ParameterInfo;
3251 method_parameter_cache [mb] = ip;
3253 return (ParameterData) ip;
3255 ParameterInfo [] pi = mb.GetParameters ();
3256 ReflectionParameters rp = new ReflectionParameters (pi);
3257 method_parameter_cache [mb] = rp;
3259 return (ParameterData) rp;
3264 // Tells whether a user defined conversion from Type `from' to
3265 // Type `to' exists.
3267 // FIXME: we could implement a cache here.
3269 static bool ConversionExists (TypeContainer tc, Type from, Type to)
3271 // Locate user-defined implicit operators
3275 mg = MemberLookup (tc, to, "op_Implicit", false);
3278 MethodGroupExpr me = (MethodGroupExpr) mg;
3280 for (int i = me.Methods.Length; i > 0;) {
3282 MethodBase mb = me.Methods [i];
3283 ParameterData pd = GetParameterData (mb);
3285 if (from == pd.ParameterType (0))
3290 mg = MemberLookup (tc, from, "op_Implicit", false);
3293 MethodGroupExpr me = (MethodGroupExpr) mg;
3295 for (int i = me.Methods.Length; i > 0;) {
3297 MethodBase mb = me.Methods [i];
3298 MethodInfo mi = (MethodInfo) mb;
3300 if (mi.ReturnType == to)
3309 // Determines "better conversion" as specified in 7.4.2.3
3310 // Returns : 1 if a->p is better
3311 // 0 if a->q or neither is better
3313 static int BetterConversion (TypeContainer tc, Argument a, Type p, Type q, bool use_standard)
3316 Type argument_type = a.Expr.Type;
3317 Expression argument_expr = a.Expr;
3319 if (argument_type == null)
3320 throw new Exception ("Expression of type " + a.Expr + " does not resolve its type");
3325 if (argument_type == p)
3328 if (argument_type == q)
3332 // Now probe whether an implicit constant expression conversion
3335 // An implicit constant expression conversion permits the following
3338 // * A constant-expression of type `int' can be converted to type
3339 // sbyte, byute, short, ushort, uint, ulong provided the value of
3340 // of the expression is withing the range of the destination type.
3342 // * A constant-expression of type long can be converted to type
3343 // ulong, provided the value of the constant expression is not negative
3345 // FIXME: Note that this assumes that constant folding has
3346 // taken place. We dont do constant folding yet.
3349 if (argument_expr is IntLiteral){
3350 IntLiteral ei = (IntLiteral) argument_expr;
3351 int value = ei.Value;
3353 if (p == TypeManager.sbyte_type){
3354 if (value >= SByte.MinValue && value <= SByte.MaxValue)
3356 } else if (p == TypeManager.byte_type){
3357 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
3359 } else if (p == TypeManager.short_type){
3360 if (value >= Int16.MinValue && value <= Int16.MaxValue)
3362 } else if (p == TypeManager.ushort_type){
3363 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
3365 } else if (p == TypeManager.uint32_type){
3367 // we can optimize this case: a positive int32
3368 // always fits on a uint32
3372 } else if (p == TypeManager.uint64_type){
3374 // we can optimize this case: a positive int32
3375 // always fits on a uint64
3380 } else if (argument_type == TypeManager.int64_type && argument_expr is LongLiteral){
3381 LongLiteral ll = (LongLiteral) argument_expr;
3383 if (p == TypeManager.uint64_type){
3394 tmp = ConvertImplicitStandard (tc, argument_expr, p, Location.Null);
3396 tmp = ConvertImplicit (tc, argument_expr, p, Location.Null);
3405 if (ConversionExists (tc, p, q) == true &&
3406 ConversionExists (tc, q, p) == false)
3409 if (p == TypeManager.sbyte_type)
3410 if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
3411 q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3414 if (p == TypeManager.short_type)
3415 if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
3416 q == TypeManager.uint64_type)
3419 if (p == TypeManager.int32_type)
3420 if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3423 if (p == TypeManager.int64_type)
3424 if (q == TypeManager.uint64_type)
3431 // Determines "Better function" and returns an integer indicating :
3432 // 0 if candidate ain't better
3433 // 1 if candidate is better than the current best match
3435 static int BetterFunction (TypeContainer tc, ArrayList args,
3436 MethodBase candidate, MethodBase best,
3439 ParameterData candidate_pd = GetParameterData (candidate);
3440 ParameterData best_pd;
3446 argument_count = args.Count;
3448 if (candidate_pd.Count == 0 && argument_count == 0)
3452 if (candidate_pd.Count == argument_count) {
3454 for (int j = argument_count; j > 0;) {
3457 Argument a = (Argument) args [j];
3459 x = BetterConversion (
3460 tc, a, candidate_pd.ParameterType (j), null,
3476 best_pd = GetParameterData (best);
3478 if (candidate_pd.Count == argument_count && best_pd.Count == argument_count) {
3479 int rating1 = 0, rating2 = 0;
3481 for (int j = argument_count; j > 0;) {
3485 Argument a = (Argument) args [j];
3487 x = BetterConversion (tc, a, candidate_pd.ParameterType (j),
3488 best_pd.ParameterType (j), use_standard);
3489 y = BetterConversion (tc, a, best_pd.ParameterType (j),
3490 candidate_pd.ParameterType (j), use_standard);
3496 if (rating1 > rating2)
3505 public static string FullMethodDesc (MethodBase mb)
3507 StringBuilder sb = new StringBuilder (mb.Name);
3508 ParameterData pd = GetParameterData (mb);
3511 for (int i = pd.Count; i > 0;) {
3513 sb.Append (TypeManager.CSharpName (pd.ParameterType (i)));
3519 return sb.ToString ();
3522 public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2)
3524 MemberInfo [] miset;
3525 MethodGroupExpr union;
3527 if (mg1 != null && mg2 != null) {
3529 MethodGroupExpr left_set = null, right_set = null;
3530 int length1 = 0, length2 = 0;
3532 left_set = (MethodGroupExpr) mg1;
3533 length1 = left_set.Methods.Length;
3535 right_set = (MethodGroupExpr) mg2;
3536 length2 = right_set.Methods.Length;
3538 ArrayList common = new ArrayList ();
3540 for (int i = 0; i < left_set.Methods.Length; i++) {
3541 for (int j = 0; j < right_set.Methods.Length; j++) {
3542 if (left_set.Methods [i] == right_set.Methods [j])
3543 common.Add (left_set.Methods [i]);
3547 miset = new MemberInfo [length1 + length2 - common.Count];
3549 left_set.Methods.CopyTo (miset, 0);
3553 for (int j = 0; j < right_set.Methods.Length; j++)
3554 if (!common.Contains (right_set.Methods [j]))
3555 miset [length1 + k++] = right_set.Methods [j];
3557 union = new MethodGroupExpr (miset);
3561 } else if (mg1 == null && mg2 != null) {
3563 MethodGroupExpr me = (MethodGroupExpr) mg2;
3565 miset = new MemberInfo [me.Methods.Length];
3566 me.Methods.CopyTo (miset, 0);
3568 union = new MethodGroupExpr (miset);
3572 } else if (mg2 == null && mg1 != null) {
3574 MethodGroupExpr me = (MethodGroupExpr) mg1;
3576 miset = new MemberInfo [me.Methods.Length];
3577 me.Methods.CopyTo (miset, 0);
3579 union = new MethodGroupExpr (miset);
3588 // Find the Applicable Function Members (7.4.2.1)
3590 // me: Method Group expression with the members to select.
3591 // it might contain constructors or methods (or anything
3592 // that maps to a method).
3594 // Arguments: ArrayList containing resolved Argument objects.
3596 // loc: The location if we want an error to be reported, or a Null
3597 // location for "probing" purposes.
3599 // inside_user_defined: controls whether OverloadResolve should use the
3600 // ConvertImplicit or ConvertImplicitStandard during overload resolution.
3602 // Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
3603 // that is the best match of me on Arguments.
3606 public static MethodBase OverloadResolve (TypeContainer tc, MethodGroupExpr me,
3607 ArrayList Arguments, Location loc,
3610 ArrayList afm = new ArrayList ();
3611 int best_match_idx = -1;
3612 MethodBase method = null;
3615 for (int i = me.Methods.Length; i > 0; ){
3617 MethodBase candidate = me.Methods [i];
3620 x = BetterFunction (tc, Arguments, candidate, method, use_standard);
3626 method = me.Methods [best_match_idx];
3630 if (Arguments == null)
3633 argument_count = Arguments.Count;
3637 // Now we see if we can at least find a method with the same number of arguments
3638 // and then try doing implicit conversion on the arguments
3639 if (best_match_idx == -1) {
3641 for (int i = me.Methods.Length; i > 0;) {
3643 MethodBase mb = me.Methods [i];
3644 pd = GetParameterData (mb);
3646 if (pd.Count == argument_count) {
3648 method = me.Methods [best_match_idx];
3659 // And now convert implicitly, each argument to the required type
3661 pd = GetParameterData (method);
3663 for (int j = argument_count; j > 0;) {
3665 Argument a = (Argument) Arguments [j];
3666 Expression a_expr = a.Expr;
3667 Type parameter_type = pd.ParameterType (j);
3669 if (a_expr.Type != parameter_type){
3673 conv = ConvertImplicitStandard (tc, a_expr, parameter_type,
3676 conv = ConvertImplicit (tc, a_expr, parameter_type,
3680 if (!Location.IsNull (loc)) {
3681 Error (tc, 1502, loc,
3682 "The best overloaded match for method '" + FullMethodDesc (method) +
3683 "' has some invalid arguments");
3684 Error (tc, 1503, loc,
3685 "Argument " + (j+1) +
3686 ": Cannot convert from '" + TypeManager.CSharpName (a_expr.Type)
3687 + "' to '" + TypeManager.CSharpName (pd.ParameterType (j)) + "'");
3692 // Update the argument with the implicit conversion
3702 public static MethodBase OverloadResolve (TypeContainer tc, MethodGroupExpr me,
3703 ArrayList Arguments, Location loc)
3705 return OverloadResolve (tc, me, Arguments, loc, false);
3708 public override Expression DoResolve (TypeContainer tc)
3711 // First, resolve the expression that is used to
3712 // trigger the invocation
3714 this.expr = expr.Resolve (tc);
3715 if (this.expr == null)
3718 if (!(this.expr is MethodGroupExpr)){
3719 report118 (tc, Location, this.expr, "method group");
3724 // Next, evaluate all the expressions in the argument list
3726 if (Arguments != null){
3727 for (int i = Arguments.Count; i > 0;){
3729 Argument a = (Argument) Arguments [i];
3731 if (!a.Resolve (tc))
3736 method = OverloadResolve (tc, (MethodGroupExpr) this.expr, Arguments,
3739 if (method == null){
3740 Error (tc, -6, Location,
3741 "Could not find any applicable function for this argument list");
3745 if (method is MethodInfo)
3746 type = ((MethodInfo)method).ReturnType;
3748 eclass = ExprClass.Value;
3752 public static void EmitArguments (EmitContext ec, MethodBase method, ArrayList Arguments)
3756 if (Arguments != null)
3757 top = Arguments.Count;
3761 for (int i = 0; i < top; i++){
3762 Argument a = (Argument) Arguments [i];
3768 public override void Emit (EmitContext ec)
3770 bool is_static = method.IsStatic;
3773 MethodGroupExpr mg = (MethodGroupExpr) this.expr;
3776 // If this is ourselves, push "this"
3778 if (mg.InstanceExpression == null){
3779 ec.ig.Emit (OpCodes.Ldarg_0);
3782 // Push the instance expression
3784 mg.InstanceExpression.Emit (ec);
3788 if (Arguments != null)
3789 EmitArguments (ec, method, Arguments);
3792 if (method is MethodInfo)
3793 ec.ig.Emit (OpCodes.Call, (MethodInfo) method);
3795 ec.ig.Emit (OpCodes.Call, (ConstructorInfo) method);
3797 if (method is MethodInfo)
3798 ec.ig.Emit (OpCodes.Callvirt, (MethodInfo) method);
3800 ec.ig.Emit (OpCodes.Callvirt, (ConstructorInfo) method);
3804 public override void EmitStatement (EmitContext ec)
3809 // Pop the return value if there is one
3811 if (method is MethodInfo){
3812 if (((MethodInfo)method).ReturnType != TypeManager.void_type)
3813 ec.ig.Emit (OpCodes.Pop);
3818 public class New : ExpressionStatement {
3825 public readonly NType NewType;
3826 public readonly ArrayList Arguments;
3827 public readonly string RequestedType;
3828 // These are for the case when we have an array
3829 public readonly string Rank;
3830 public readonly ArrayList Indices;
3831 public readonly ArrayList Initializers;
3834 MethodBase method = null;
3836 public New (string requested_type, ArrayList arguments, Location loc)
3838 RequestedType = requested_type;
3839 Arguments = arguments;
3840 NewType = NType.Object;
3844 public New (string requested_type, ArrayList exprs, string rank, ArrayList initializers, Location loc)
3846 RequestedType = requested_type;
3849 Initializers = initializers;
3850 NewType = NType.Array;
3854 public override Expression DoResolve (TypeContainer tc)
3856 type = tc.LookupType (RequestedType, false);
3863 ml = MemberLookup (tc, type, ".ctor", false,
3864 MemberTypes.Constructor, AllBindingsFlags);
3866 if (! (ml is MethodGroupExpr)){
3868 // FIXME: Find proper error
3870 report118 (tc, Location, ml, "method group");
3874 if (Arguments != null){
3875 for (int i = Arguments.Count; i > 0;){
3877 Argument a = (Argument) Arguments [i];
3879 if (!a.Resolve (tc))
3884 method = Invocation.OverloadResolve (tc, (MethodGroupExpr) ml, Arguments,
3887 if (method == null) {
3888 Error (tc, -6, Location,
3889 "New invocation: Can not find a constructor for this argument list");
3893 eclass = ExprClass.Value;
3897 public override void Emit (EmitContext ec)
3899 Invocation.EmitArguments (ec, method, Arguments);
3900 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
3903 public override void EmitStatement (EmitContext ec)
3906 ec.ig.Emit (OpCodes.Pop);
3911 // Represents the `this' construct
3913 public class This : Expression, LValue {
3914 public override Expression DoResolve (TypeContainer tc)
3916 eclass = ExprClass.Variable;
3917 type = tc.TypeBuilder;
3920 // FIXME: Verify that this is only used in instance contexts.
3925 public override void Emit (EmitContext ec)
3927 ec.ig.Emit (OpCodes.Ldarg_0);
3930 public void Store (EmitContext ec)
3933 // Assignment to the "this" variable.
3935 // FIXME: Apparently this is a bug that we
3936 // must catch as `this' seems to be readonly ;-)
3938 ec.ig.Emit (OpCodes.Starg, 0);
3941 public void AddressOf (EmitContext ec)
3943 ec.ig.Emit (OpCodes.Ldarga_S, (byte) 0);
3948 // Implements the typeof operator
3950 public class TypeOf : Expression {
3951 public readonly string QueriedType;
3954 public TypeOf (string queried_type)
3956 QueriedType = queried_type;
3959 public override Expression DoResolve (TypeContainer tc)
3961 typearg = tc.LookupType (QueriedType, false);
3963 if (typearg == null)
3966 type = TypeManager.type_type;
3967 eclass = ExprClass.Type;
3971 public override void Emit (EmitContext ec)
3973 ec.ig.Emit (OpCodes.Ldtoken, typearg);
3974 ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
3978 public class SizeOf : Expression {
3979 public readonly string QueriedType;
3981 public SizeOf (string queried_type)
3983 this.QueriedType = queried_type;
3986 public override Expression DoResolve (TypeContainer tc)
3988 // FIXME: Implement;
3989 throw new Exception ("Unimplemented");
3993 public override void Emit (EmitContext ec)
3995 throw new Exception ("Implement me");
3999 public class MemberAccess : Expression {
4000 public readonly string Identifier;
4002 Expression member_lookup;
4004 public MemberAccess (Expression expr, string id)
4010 public Expression Expr {
4016 public override Expression DoResolve (TypeContainer tc)
4018 Expression new_expression = expr.Resolve (tc);
4020 if (new_expression == null)
4023 member_lookup = MemberLookup (tc, expr.Type, Identifier, false);
4025 if (member_lookup is MethodGroupExpr){
4026 MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
4029 // Bind the instance expression to it
4031 // FIXME: This is a horrible way of detecting if it is
4032 // an instance expression. Figure out how to fix this.
4035 if (expr is LocalVariableReference ||
4036 expr is ParameterReference ||
4038 mg.InstanceExpression = expr;
4040 return member_lookup;
4041 } else if (member_lookup is FieldExpr){
4042 FieldExpr fe = (FieldExpr) member_lookup;
4046 return member_lookup;
4049 // FIXME: This should generate the proper node
4050 // ie, for a Property Access, it should like call it
4053 return member_lookup;
4056 public override void Emit (EmitContext ec)
4058 throw new Exception ("Should not happen I think");
4064 // Nodes of type Namespace are created during the semantic
4065 // analysis to resolve member_access/qualified_identifier/simple_name
4068 // They are born `resolved'.
4070 public class NamespaceExpr : Expression {
4071 public readonly string Name;
4073 public NamespaceExpr (string name)
4076 eclass = ExprClass.Namespace;
4079 public override Expression DoResolve (TypeContainer tc)
4084 public override void Emit (EmitContext ec)
4086 throw new Exception ("Namespace expressions should never be emitted");
4091 // Fully resolved expression that evaluates to a type
4093 public class TypeExpr : Expression {
4094 public TypeExpr (Type t)
4097 eclass = ExprClass.Type;
4100 override public Expression DoResolve (TypeContainer tc)
4105 override public void Emit (EmitContext ec)
4107 throw new Exception ("Implement me");
4112 // MethodGroup Expression.
4114 // This is a fully resolved expression that evaluates to a type
4116 public class MethodGroupExpr : Expression {
4117 public readonly MethodBase [] Methods;
4118 Expression instance_expression = null;
4120 public MethodGroupExpr (MemberInfo [] mi)
4122 Methods = new MethodBase [mi.Length];
4123 mi.CopyTo (Methods, 0);
4124 eclass = ExprClass.MethodGroup;
4128 // `A method group may have associated an instance expression'
4130 public Expression InstanceExpression {
4132 return instance_expression;
4136 instance_expression = value;
4140 override public Expression DoResolve (TypeContainer tc)
4145 override public void Emit (EmitContext ec)
4147 throw new Exception ("This should never be reached");
4151 // Fully resolved expression that evaluates to a Field
4153 public class FieldExpr : Expression, LValue {
4154 public readonly FieldInfo FieldInfo;
4155 public Expression Instance;
4157 public FieldExpr (FieldInfo fi)
4160 eclass = ExprClass.Variable;
4161 type = fi.FieldType;
4164 override public Expression DoResolve (TypeContainer tc)
4166 if (!FieldInfo.IsStatic){
4167 if (Instance == null){
4168 throw new Exception ("non-static FieldExpr without instance var\n" +
4169 "You have to assign the Instance variable\n" +
4170 "Of the FieldExpr to set this\n");
4173 Instance = Instance.Resolve (tc);
4174 if (Instance == null)
4181 override public void Emit (EmitContext ec)
4183 ILGenerator ig = ec.ig;
4185 if (FieldInfo.IsStatic)
4186 ig.Emit (OpCodes.Ldsfld, FieldInfo);
4190 ig.Emit (OpCodes.Ldfld, FieldInfo);
4194 public void Store (EmitContext ec)
4196 if (FieldInfo.IsStatic)
4197 ec.ig.Emit (OpCodes.Stsfld, FieldInfo);
4199 ec.ig.Emit (OpCodes.Stfld, FieldInfo);
4202 public void AddressOf (EmitContext ec)
4204 if (FieldInfo.IsStatic)
4205 ec.ig.Emit (OpCodes.Ldsflda, FieldInfo);
4208 ec.ig.Emit (OpCodes.Ldflda, FieldInfo);
4214 // Fully resolved expression that evaluates to a Property
4216 public class PropertyExpr : Expression {
4217 public readonly PropertyInfo PropertyInfo;
4218 public readonly bool IsStatic;
4220 public PropertyExpr (PropertyInfo pi)
4223 eclass = ExprClass.PropertyAccess;
4226 MethodBase [] acc = pi.GetAccessors ();
4228 for (int i = 0; i < acc.Length; i++)
4229 if (acc [i].IsStatic)
4232 type = pi.PropertyType;
4235 override public Expression DoResolve (TypeContainer tc)
4237 // We are born in resolved state.
4241 override public void Emit (EmitContext ec)
4243 // FIXME: Implement;
4244 throw new Exception ("Unimplemented");
4249 // Fully resolved expression that evaluates to a Expression
4251 public class EventExpr : Expression {
4252 public readonly EventInfo EventInfo;
4254 public EventExpr (EventInfo ei)
4257 eclass = ExprClass.EventAccess;
4260 override public Expression DoResolve (TypeContainer tc)
4262 // We are born in resolved state.
4266 override public void Emit (EmitContext ec)
4268 throw new Exception ("Implement me");
4269 // FIXME: Implement.
4273 public class CheckedExpr : Expression {
4275 public Expression Expr;
4277 public CheckedExpr (Expression e)
4282 public override Expression DoResolve (TypeContainer tc)
4284 Expr = Expr.Resolve (tc);
4289 eclass = Expr.ExprClass;
4294 public override void Emit (EmitContext ec)
4296 bool last_check = ec.CheckState;
4298 ec.CheckState = true;
4300 ec.CheckState = last_check;
4305 public class UnCheckedExpr : Expression {
4307 public Expression Expr;
4309 public UnCheckedExpr (Expression e)
4314 public override Expression DoResolve (TypeContainer tc)
4316 Expr = Expr.Resolve (tc);
4321 eclass = Expr.ExprClass;
4326 public override void Emit (EmitContext ec)
4328 bool last_check = ec.CheckState;
4330 ec.CheckState = false;
4332 ec.CheckState = last_check;
4337 public class ElementAccess : Expression {
4339 public readonly ArrayList Arguments;
4340 public readonly Expression Expr;
4342 public ElementAccess (Expression e, ArrayList e_list)
4348 public override Expression DoResolve (TypeContainer tc)
4350 // FIXME: Implement;
4351 throw new Exception ("Unimplemented");
4355 public override void Emit (EmitContext ec)
4357 // FIXME : Implement !
4358 throw new Exception ("Unimplemented");
4363 public class BaseAccess : Expression {
4365 public enum BaseAccessType {
4370 public readonly BaseAccessType BAType;
4371 public readonly string Member;
4372 public readonly ArrayList Arguments;
4374 public BaseAccess (BaseAccessType t, string member, ArrayList args)
4382 public override Expression DoResolve (TypeContainer tc)
4384 // FIXME: Implement;
4385 throw new Exception ("Unimplemented");
4389 public override void Emit (EmitContext ec)
4391 throw new Exception ("Unimplemented");
4395 public class UserCast : Expression {
4398 Type most_specific_source;
4399 Type most_specific_target;
4402 public UserCast (MethodInfo method, Expression source, Type most_specific_source,
4403 Type most_specific_target, bool is_explicit)
4405 this.method = method;
4406 this.source = source;
4407 this.most_specific_source = most_specific_source;
4408 this.most_specific_target = most_specific_target;
4409 this.is_explicit = is_explicit;
4410 type = method.ReturnType;
4411 eclass = ExprClass.Value;
4414 public override Expression DoResolve (TypeContainer tc)
4417 // We are born in a fully resolved state
4422 public override void Emit (EmitContext ec)
4424 ILGenerator ig = ec.ig;
4425 Location tmp = new Location (-1);
4427 // Note that operators are static anyway
4432 e = ConvertImplicitStandard (ec.parent, source, most_specific_source, tmp);
4434 e = ConvertExplicit (ec.parent, source, most_specific_source, tmp);
4438 if (method is MethodInfo)
4439 ig.Emit (OpCodes.Call, (MethodInfo) method);
4441 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
projects / mono.git / blob