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.icloneable_type)
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.icloneable_type)
777 // from the null type to any reference-type.
778 // FIXME : How do we do this ?
786 // Finds "most encompassed type" according to the spec (13.4.2)
787 // amongst the methods in the MethodGroupExpr which convert from a
788 // type encompassing source_type
790 static Type FindMostEncompassedType (TypeContainer tc, MethodGroupExpr me, Type source_type)
794 for (int i = me.Methods.Length; i > 0; ) {
797 MethodBase mb = me.Methods [i];
798 ParameterData pd = Invocation.GetParameterData (mb);
799 Type param_type = pd.ParameterType (0);
801 if (StandardConversionExists (source_type, param_type)) {
805 if (StandardConversionExists (param_type, best))
814 // Finds "most encompassing type" according to the spec (13.4.2)
815 // amongst the methods in the MethodGroupExpr which convert to a
816 // type encompassed by target_type
818 static Type FindMostEncompassingType (TypeContainer tc, MethodGroupExpr me, Type target)
822 for (int i = me.Methods.Length; i > 0; ) {
825 MethodInfo mi = (MethodInfo) me.Methods [i];
826 Type ret_type = mi.ReturnType;
828 if (StandardConversionExists (ret_type, target)) {
832 if (!StandardConversionExists (ret_type, best))
844 // User-defined Implicit conversions
846 static public Expression ImplicitUserConversion (TypeContainer tc, Expression source, Type target,
849 return UserDefinedConversion (tc, source, target, l, false);
853 // User-defined Explicit conversions
855 static public Expression ExplicitUserConversion (TypeContainer tc, Expression source, Type target,
858 return UserDefinedConversion (tc, source, target, l, true);
862 // User-defined conversions
864 static public Expression UserDefinedConversion (TypeContainer tc, Expression source,
865 Type target, Location l, bool look_for_explicit)
867 Expression mg1 = null, mg2 = null, mg3 = null, mg4 = null;
868 Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
870 MethodBase method = null;
871 Type source_type = source.Type;
875 // If we have a boolean type, we need to check for the True operator
877 // FIXME : How does the False operator come into the picture ?
878 // FIXME : This doesn't look complete and very correct !
879 if (target == TypeManager.bool_type)
882 op_name = "op_Implicit";
884 mg1 = MemberLookup (tc, source_type, op_name, false);
886 if (source_type.BaseType != null)
887 mg2 = MemberLookup (tc, source_type.BaseType, op_name, false);
889 mg3 = MemberLookup (tc, target, op_name, false);
891 if (target.BaseType != null)
892 mg4 = MemberLookup (tc, target.BaseType, op_name, false);
894 MethodGroupExpr union1 = Invocation.MakeUnionSet (mg1, mg2);
895 MethodGroupExpr union2 = Invocation.MakeUnionSet (mg3, mg4);
897 MethodGroupExpr union3 = Invocation.MakeUnionSet (union1, union2);
899 MethodGroupExpr union4 = null;
901 if (look_for_explicit) {
903 op_name = "op_Explicit";
905 mg5 = MemberLookup (tc, source_type, op_name, false);
907 if (source_type.BaseType != null)
908 mg6 = MemberLookup (tc, source_type.BaseType, op_name, false);
910 mg7 = MemberLookup (tc, target, op_name, false);
912 if (target.BaseType != null)
913 mg8 = MemberLookup (tc, target.BaseType, op_name, false);
915 MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6);
916 MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8);
918 union4 = Invocation.MakeUnionSet (union5, union6);
921 MethodGroupExpr union = Invocation.MakeUnionSet (union3, union4);
925 Type most_specific_source, most_specific_target;
927 most_specific_source = FindMostEncompassedType (tc, union, source_type);
928 if (most_specific_source == null)
931 most_specific_target = FindMostEncompassingType (tc, union, target);
932 if (most_specific_target == null)
937 for (int i = union.Methods.Length; i > 0;) {
940 MethodBase mb = union.Methods [i];
941 ParameterData pd = Invocation.GetParameterData (mb);
942 MethodInfo mi = (MethodInfo) union.Methods [i];
944 if (pd.ParameterType (0) == most_specific_source &&
945 mi.ReturnType == most_specific_target) {
951 if (method == null || count > 1) {
952 Report.Error (-11, l, "Ambiguous user defined conversion");
957 // This will do the conversion to the best match that we
958 // found. Now we need to perform an implict standard conversion
959 // if the best match was not the type that we were requested
962 e = new UserCast ((MethodInfo) method, source, most_specific_source,
963 most_specific_target, look_for_explicit);
965 if (e.Type != target){
966 e = ConvertImplicitStandard (tc, e, target, l);
976 // Converts implicitly the resolved expression `expr' into the
977 // `target_type'. It returns a new expression that can be used
978 // in a context that expects a `target_type'.
980 static public Expression ConvertImplicit (TypeContainer tc, Expression expr,
981 Type target_type, Location l)
983 Type expr_type = expr.Type;
986 if (expr_type == target_type)
989 e = ImplicitNumericConversion (tc, expr, target_type, l);
993 e = ImplicitReferenceConversion (expr, target_type);
997 e = ImplicitUserConversion (tc, expr, target_type, l);
1001 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1002 IntLiteral i = (IntLiteral) expr;
1005 return new EmptyCast (expr, target_type);
1013 // Attempts to apply the `Standard Implicit
1014 // Conversion' rules to the expression `expr' into
1015 // the `target_type'. It returns a new expression
1016 // that can be used in a context that expects a
1019 // This is different from `ConvertImplicit' in that the
1020 // user defined implicit conversions are excluded.
1022 static public Expression ConvertImplicitStandard (TypeContainer tc, Expression expr,
1023 Type target_type, Location l)
1025 Type expr_type = expr.Type;
1028 if (expr_type == target_type)
1031 e = ImplicitNumericConversion (tc, expr, target_type, l);
1035 e = ImplicitReferenceConversion (expr, target_type);
1039 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1040 IntLiteral i = (IntLiteral) expr;
1043 return new EmptyCast (expr, target_type);
1048 // Attemps to perform an implict constant conversion of the IntLiteral
1049 // into a different data type using casts (See Implicit Constant
1050 // Expression Conversions)
1052 static protected Expression TryImplicitIntConversion (Type target_type, IntLiteral il)
1054 int value = il.Value;
1056 if (target_type == TypeManager.sbyte_type){
1057 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1059 } else if (target_type == TypeManager.byte_type){
1060 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1062 } else if (target_type == TypeManager.short_type){
1063 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1065 } else if (target_type == TypeManager.ushort_type){
1066 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1068 } else if (target_type == TypeManager.uint32_type){
1070 // we can optimize this case: a positive int32
1071 // always fits on a uint32
1075 } else if (target_type == TypeManager.uint64_type){
1077 // we can optimize this case: a positive int32
1078 // always fits on a uint64. But we need an opcode
1082 return new OpcodeCast (il, target_type, OpCodes.Conv_I8);
1089 // Attemptes to implicityly convert `target' into `type', using
1090 // ConvertImplicit. If there is no implicit conversion, then
1091 // an error is signaled
1093 static public Expression ConvertImplicitRequired (TypeContainer tc, Expression target,
1094 Type type, Location l)
1098 e = ConvertImplicit (tc, target, type, l);
1102 string msg = "Can not convert implicitly from `"+
1103 TypeManager.CSharpName (target.Type) + "' to `" +
1104 TypeManager.CSharpName (type) + "'";
1106 Error (tc, 29, l, msg);
1112 // Performs the explicit numeric conversions
1114 static Expression ConvertNumericExplicit (TypeContainer tc, Expression expr,
1117 Type expr_type = expr.Type;
1119 if (expr_type == TypeManager.sbyte_type){
1121 // From sbyte to byte, ushort, uint, ulong, char
1123 if (target_type == TypeManager.byte_type)
1124 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1125 if (target_type == TypeManager.ushort_type)
1126 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1127 if (target_type == TypeManager.uint32_type)
1128 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1129 if (target_type == TypeManager.uint64_type)
1130 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1131 if (target_type == TypeManager.char_type)
1132 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1133 } else if (expr_type == TypeManager.byte_type){
1135 // From byte to sbyte and char
1137 if (target_type == TypeManager.sbyte_type)
1138 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1139 if (target_type == TypeManager.char_type)
1140 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1141 } else if (expr_type == TypeManager.short_type){
1143 // From short to sbyte, byte, ushort, uint, ulong, char
1145 if (target_type == TypeManager.sbyte_type)
1146 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1147 if (target_type == TypeManager.byte_type)
1148 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1149 if (target_type == TypeManager.ushort_type)
1150 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1151 if (target_type == TypeManager.uint32_type)
1152 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1153 if (target_type == TypeManager.uint64_type)
1154 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1155 if (target_type == TypeManager.char_type)
1156 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1157 } else if (expr_type == TypeManager.ushort_type){
1159 // From ushort to sbyte, byte, short, char
1161 if (target_type == TypeManager.sbyte_type)
1162 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1163 if (target_type == TypeManager.byte_type)
1164 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1165 if (target_type == TypeManager.short_type)
1166 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1167 if (target_type == TypeManager.char_type)
1168 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1169 } else if (expr_type == TypeManager.int32_type){
1171 // From int to sbyte, byte, short, ushort, uint, ulong, char
1173 if (target_type == TypeManager.sbyte_type)
1174 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1175 if (target_type == TypeManager.byte_type)
1176 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1177 if (target_type == TypeManager.short_type)
1178 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1179 if (target_type == TypeManager.ushort_type)
1180 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1181 if (target_type == TypeManager.uint32_type)
1182 return new EmptyCast (expr, target_type);
1183 if (target_type == TypeManager.uint64_type)
1184 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1185 if (target_type == TypeManager.char_type)
1186 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1187 } else if (expr_type == TypeManager.uint32_type){
1189 // From uint to sbyte, byte, short, ushort, int, char
1191 if (target_type == TypeManager.sbyte_type)
1192 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1193 if (target_type == TypeManager.byte_type)
1194 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1195 if (target_type == TypeManager.short_type)
1196 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1197 if (target_type == TypeManager.ushort_type)
1198 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1199 if (target_type == TypeManager.int32_type)
1200 return new EmptyCast (expr, target_type);
1201 if (target_type == TypeManager.char_type)
1202 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1203 } else if (expr_type == TypeManager.int64_type){
1205 // From long to sbyte, byte, short, ushort, int, uint, ulong, char
1207 if (target_type == TypeManager.sbyte_type)
1208 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1209 if (target_type == TypeManager.byte_type)
1210 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1211 if (target_type == TypeManager.short_type)
1212 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1213 if (target_type == TypeManager.ushort_type)
1214 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1215 if (target_type == TypeManager.int32_type)
1216 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1217 if (target_type == TypeManager.uint32_type)
1218 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1219 if (target_type == TypeManager.uint64_type)
1220 return new EmptyCast (expr, target_type);
1221 if (target_type == TypeManager.char_type)
1222 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1223 } else if (expr_type == TypeManager.uint64_type){
1225 // From ulong to sbyte, byte, short, ushort, int, uint, long, char
1227 if (target_type == TypeManager.sbyte_type)
1228 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1229 if (target_type == TypeManager.byte_type)
1230 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1231 if (target_type == TypeManager.short_type)
1232 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1233 if (target_type == TypeManager.ushort_type)
1234 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1235 if (target_type == TypeManager.int32_type)
1236 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1237 if (target_type == TypeManager.uint32_type)
1238 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1239 if (target_type == TypeManager.int64_type)
1240 return new EmptyCast (expr, target_type);
1241 if (target_type == TypeManager.char_type)
1242 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1243 } else if (expr_type == TypeManager.char_type){
1245 // From char to sbyte, byte, short
1247 if (target_type == TypeManager.sbyte_type)
1248 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1249 if (target_type == TypeManager.byte_type)
1250 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1251 if (target_type == TypeManager.short_type)
1252 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1253 } else if (expr_type == TypeManager.float_type){
1255 // From float to sbyte, byte, short,
1256 // ushort, int, uint, long, ulong, char
1259 if (target_type == TypeManager.sbyte_type)
1260 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1261 if (target_type == TypeManager.byte_type)
1262 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1263 if (target_type == TypeManager.short_type)
1264 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1265 if (target_type == TypeManager.ushort_type)
1266 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1267 if (target_type == TypeManager.int32_type)
1268 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1269 if (target_type == TypeManager.uint32_type)
1270 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1271 if (target_type == TypeManager.int64_type)
1272 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1273 if (target_type == TypeManager.uint64_type)
1274 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1275 if (target_type == TypeManager.char_type)
1276 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1277 if (target_type == TypeManager.decimal_type)
1278 return InternalTypeConstructor (tc, expr, target_type);
1279 } else if (expr_type == TypeManager.double_type){
1281 // From double to byte, byte, short,
1282 // ushort, int, uint, long, ulong,
1283 // char, float or decimal
1285 if (target_type == TypeManager.sbyte_type)
1286 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1287 if (target_type == TypeManager.byte_type)
1288 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1289 if (target_type == TypeManager.short_type)
1290 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1291 if (target_type == TypeManager.ushort_type)
1292 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1293 if (target_type == TypeManager.int32_type)
1294 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1295 if (target_type == TypeManager.uint32_type)
1296 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1297 if (target_type == TypeManager.int64_type)
1298 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1299 if (target_type == TypeManager.uint64_type)
1300 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1301 if (target_type == TypeManager.char_type)
1302 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1303 if (target_type == TypeManager.float_type)
1304 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
1305 if (target_type == TypeManager.decimal_type)
1306 return InternalTypeConstructor (tc, expr, target_type);
1309 // decimal is taken care of by the op_Explicit methods.
1315 // Implements Explicit Reference conversions
1317 static Expression ConvertReferenceExplicit (TypeContainer tc, Expression expr,
1320 Type expr_type = expr.Type;
1321 bool target_is_value_type = target_type.IsValueType;
1324 // From object to any reference type
1326 if (expr_type == TypeManager.object_type && !target_is_value_type)
1327 return new ClassCast (expr, target_type);
1333 // Performs an explicit conversion of the expression `expr' whose
1334 // type is expr.Type to `target_type'.
1336 static public Expression ConvertExplicit (TypeContainer tc, Expression expr,
1337 Type target_type, Location l)
1339 Expression ne = ConvertImplicitStandard (tc, expr, target_type, l);
1344 ne = ConvertNumericExplicit (tc, expr, target_type);
1348 ne = ConvertReferenceExplicit (tc, expr, target_type);
1352 ne = ExplicitUserConversion (tc, expr, target_type, l);
1356 Report.Error (30, l, "Cannot convert type '" + TypeManager.CSharpName (expr.Type) + "' to '"
1357 + TypeManager.CSharpName (target_type) + "'");
1361 static string ExprClassName (ExprClass c)
1364 case ExprClass.Invalid:
1366 case ExprClass.Value:
1368 case ExprClass.Variable:
1370 case ExprClass.Namespace:
1372 case ExprClass.Type:
1374 case ExprClass.MethodGroup:
1375 return "method group";
1376 case ExprClass.PropertyAccess:
1377 return "property access";
1378 case ExprClass.EventAccess:
1379 return "event access";
1380 case ExprClass.IndexerAccess:
1381 return "indexer access";
1382 case ExprClass.Nothing:
1385 throw new Exception ("Should not happen");
1389 // Reports that we were expecting `expr' to be of class `expected'
1391 protected void report118 (TypeContainer tc, Location l, Expression expr, string expected)
1393 string kind = "Unknown";
1396 kind = ExprClassName (expr.ExprClass);
1398 Error (tc, 118, l, "Expression denotes a '" + kind +
1399 "' where an " + expected + " was expected");
1404 // This is just a base class for expressions that can
1405 // appear on statements (invocations, object creation,
1406 // assignments, post/pre increment and decrement). The idea
1407 // being that they would support an extra Emition interface that
1408 // does not leave a result on the stack.
1411 public abstract class ExpressionStatement : Expression {
1414 // Requests the expression to be emitted in a `statement'
1415 // context. This means that no new value is left on the
1416 // stack after invoking this method (constrasted with
1417 // Emit that will always leave a value on the stack).
1419 public abstract void EmitStatement (EmitContext ec);
1423 // This kind of cast is used to encapsulate the child
1424 // whose type is child.Type into an expression that is
1425 // reported to return "return_type". This is used to encapsulate
1426 // expressions which have compatible types, but need to be dealt
1427 // at higher levels with.
1429 // For example, a "byte" expression could be encapsulated in one
1430 // of these as an "unsigned int". The type for the expression
1431 // would be "unsigned int".
1435 public class EmptyCast : Expression {
1436 protected Expression child;
1438 public EmptyCast (Expression child, Type return_type)
1440 ExprClass = child.ExprClass;
1445 public override Expression DoResolve (TypeContainer tc)
1447 // This should never be invoked, we are born in fully
1448 // initialized state.
1453 public override void Emit (EmitContext ec)
1460 // This kind of cast is used to encapsulate Value Types in objects.
1462 // The effect of it is to box the value type emitted by the previous
1465 public class BoxedCast : EmptyCast {
1467 public BoxedCast (Expression expr)
1468 : base (expr, TypeManager.object_type)
1472 public override Expression DoResolve (TypeContainer tc)
1474 // This should never be invoked, we are born in fully
1475 // initialized state.
1480 public override void Emit (EmitContext ec)
1483 ec.ig.Emit (OpCodes.Box, child.Type);
1488 // This kind of cast is used to encapsulate a child expression
1489 // that can be trivially converted to a target type using one or
1490 // two opcodes. The opcodes are passed as arguments.
1492 public class OpcodeCast : EmptyCast {
1496 public OpcodeCast (Expression child, Type return_type, OpCode op)
1497 : base (child, return_type)
1501 second_valid = false;
1504 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
1505 : base (child, return_type)
1510 second_valid = true;
1513 public override Expression DoResolve (TypeContainer tc)
1515 // This should never be invoked, we are born in fully
1516 // initialized state.
1521 public override void Emit (EmitContext ec)
1533 // This kind of cast is used to encapsulate a child and cast it
1534 // to the class requested
1536 public class ClassCast : EmptyCast {
1537 public ClassCast (Expression child, Type return_type)
1538 : base (child, return_type)
1543 public override Expression DoResolve (TypeContainer tc)
1545 // This should never be invoked, we are born in fully
1546 // initialized state.
1551 public override void Emit (EmitContext ec)
1555 ec.ig.Emit (OpCodes.Castclass, type);
1561 // Unary expressions.
1565 // Unary implements unary expressions. It derives from
1566 // ExpressionStatement becuase the pre/post increment/decrement
1567 // operators can be used in a statement context.
1569 public class Unary : ExpressionStatement {
1570 public enum Operator {
1571 Addition, Subtraction, Negate, BitComplement,
1572 Indirection, AddressOf, PreIncrement,
1573 PreDecrement, PostIncrement, PostDecrement
1578 ArrayList Arguments;
1582 public Unary (Operator op, Expression expr, Location loc)
1586 this.location = loc;
1589 public Expression Expr {
1599 public Operator Oper {
1610 // Returns a stringified representation of the Operator
1615 case Operator.Addition:
1617 case Operator.Subtraction:
1619 case Operator.Negate:
1621 case Operator.BitComplement:
1623 case Operator.AddressOf:
1625 case Operator.Indirection:
1627 case Operator.PreIncrement : case Operator.PostIncrement :
1629 case Operator.PreDecrement : case Operator.PostDecrement :
1633 return oper.ToString ();
1636 Expression ForceConversion (TypeContainer tc, Expression expr, Type target_type)
1638 if (expr.Type == target_type)
1641 return ConvertImplicit (tc, expr, target_type, new Location (-1));
1644 void error23 (TypeContainer tc, Type t)
1646 Report.Error (23, location, "Operator " + OperName () +
1647 " cannot be applied to operand of type `" +
1648 TypeManager.CSharpName (t) + "'");
1652 // Returns whether an object of type `t' can be incremented
1653 // or decremented with add/sub (ie, basically whether we can
1654 // use pre-post incr-decr operations on it, but it is not a
1655 // System.Decimal, which we test elsewhere)
1657 static bool IsIncrementableNumber (Type t)
1659 return (t == TypeManager.sbyte_type) ||
1660 (t == TypeManager.byte_type) ||
1661 (t == TypeManager.short_type) ||
1662 (t == TypeManager.ushort_type) ||
1663 (t == TypeManager.int32_type) ||
1664 (t == TypeManager.uint32_type) ||
1665 (t == TypeManager.int64_type) ||
1666 (t == TypeManager.uint64_type) ||
1667 (t == TypeManager.char_type) ||
1668 (t.IsSubclassOf (TypeManager.enum_type)) ||
1669 (t == TypeManager.float_type) ||
1670 (t == TypeManager.double_type);
1673 Expression ResolveOperator (TypeContainer tc)
1675 Type expr_type = expr.Type;
1678 // Step 1: Perform Operator Overload location
1683 if (oper == Operator.PostIncrement || oper == Operator.PreIncrement)
1684 op_name = "op_Increment";
1685 else if (oper == Operator.PostDecrement || oper == Operator.PreDecrement)
1686 op_name = "op_Decrement";
1688 op_name = "op_" + oper;
1690 mg = MemberLookup (tc, expr_type, op_name, false);
1692 if (mg == null && expr_type.BaseType != null)
1693 mg = MemberLookup (tc, expr_type.BaseType, op_name, false);
1696 Arguments = new ArrayList ();
1697 Arguments.Add (new Argument (expr, Argument.AType.Expression));
1699 method = Invocation.OverloadResolve (tc, (MethodGroupExpr) mg,
1700 Arguments, location);
1701 if (method != null) {
1702 MethodInfo mi = (MethodInfo) method;
1703 type = mi.ReturnType;
1706 error23 (tc, expr_type);
1713 // Step 2: Default operations on CLI native types.
1716 // Only perform numeric promotions on:
1719 if (expr_type == null)
1722 if (oper == Operator.Negate){
1723 if (expr_type != TypeManager.bool_type) {
1724 error23 (tc, expr.Type);
1728 type = TypeManager.bool_type;
1732 if (oper == Operator.BitComplement) {
1733 if (!((expr_type == TypeManager.int32_type) ||
1734 (expr_type == TypeManager.uint32_type) ||
1735 (expr_type == TypeManager.int64_type) ||
1736 (expr_type == TypeManager.uint64_type) ||
1737 (expr_type.IsSubclassOf (TypeManager.enum_type)))){
1738 error23 (tc, expr.Type);
1745 if (oper == Operator.Addition) {
1747 // A plus in front of something is just a no-op, so return the child.
1753 // Deals with -literals
1754 // int operator- (int x)
1755 // long operator- (long x)
1756 // float operator- (float f)
1757 // double operator- (double d)
1758 // decimal operator- (decimal d)
1760 if (oper == Operator.Subtraction){
1762 // Fold a "- Constant" into a negative constant
1765 Expression e = null;
1768 // Is this a constant?
1770 if (expr is IntLiteral)
1771 e = new IntLiteral (-((IntLiteral) expr).Value);
1772 else if (expr is LongLiteral)
1773 e = new LongLiteral (-((LongLiteral) expr).Value);
1774 else if (expr is FloatLiteral)
1775 e = new FloatLiteral (-((FloatLiteral) expr).Value);
1776 else if (expr is DoubleLiteral)
1777 e = new DoubleLiteral (-((DoubleLiteral) expr).Value);
1778 else if (expr is DecimalLiteral)
1779 e = new DecimalLiteral (-((DecimalLiteral) expr).Value);
1787 // Not a constant we can optimize, perform numeric
1788 // promotions to int, long, double.
1791 // The following is inneficient, because we call
1792 // ConvertImplicit too many times.
1794 // It is also not clear if we should convert to Float
1795 // or Double initially.
1797 Location l = new Location (-1);
1799 if (expr_type == TypeManager.uint32_type){
1801 // FIXME: handle exception to this rule that
1802 // permits the int value -2147483648 (-2^31) to
1803 // bt written as a decimal interger literal
1805 type = TypeManager.int64_type;
1806 expr = ConvertImplicit (tc, expr, type, l);
1810 if (expr_type == TypeManager.uint64_type){
1812 // FIXME: Handle exception of `long value'
1813 // -92233720368547758087 (-2^63) to be written as
1814 // decimal integer literal.
1816 error23 (tc, expr_type);
1820 e = ConvertImplicit (tc, expr, TypeManager.int32_type, l);
1827 e = ConvertImplicit (tc, expr, TypeManager.int64_type, l);
1834 e = ConvertImplicit (tc, expr, TypeManager.double_type, l);
1841 error23 (tc, expr_type);
1846 // The operand of the prefix/postfix increment decrement operators
1847 // should be an expression that is classified as a variable,
1848 // a property access or an indexer access
1850 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
1851 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
1852 if (expr.ExprClass == ExprClass.Variable){
1853 if (IsIncrementableNumber (expr_type) ||
1854 expr_type == TypeManager.decimal_type){
1858 } else if (expr.ExprClass == ExprClass.IndexerAccess){
1860 // FIXME: Verify that we have both get and set methods
1862 throw new Exception ("Implement me");
1863 } else if (expr.ExprClass == ExprClass.PropertyAccess){
1865 // FIXME: Verify that we have both get and set methods
1867 throw new Exception ("Implement me");
1869 report118 (tc, location, expr,
1870 "variable, indexer or property access");
1874 if (oper == Operator.AddressOf){
1875 if (expr.ExprClass != ExprClass.Variable){
1876 Error (tc, 211, "Cannot take the address of non-variables");
1879 type = Type.GetType (expr.Type.ToString () + "*");
1882 Error (tc, 187, "No such operator '" + OperName () + "' defined for type '" +
1883 TypeManager.CSharpName (expr_type) + "'");
1888 public override Expression DoResolve (TypeContainer tc)
1890 expr = expr.Resolve (tc);
1895 eclass = ExprClass.Value;
1896 return ResolveOperator (tc);
1899 public override void Emit (EmitContext ec)
1901 ILGenerator ig = ec.ig;
1902 Type expr_type = expr.Type;
1904 if (method != null) {
1906 // Note that operators are static anyway
1908 if (Arguments != null)
1909 Invocation.EmitArguments (ec, method, Arguments);
1912 // Post increment/decrement operations need a copy at this
1915 if (oper == Operator.PostDecrement || oper == Operator.PostIncrement)
1916 ig.Emit (OpCodes.Dup);
1919 ig.Emit (OpCodes.Call, (MethodInfo) method);
1922 // Pre Increment and Decrement operators
1924 if (oper == Operator.PreIncrement || oper == Operator.PreDecrement){
1925 ig.Emit (OpCodes.Dup);
1929 // Increment and Decrement should store the result
1931 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
1932 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
1933 ((LValue) expr).Store (ec);
1939 case Operator.Addition:
1940 throw new Exception ("This should be caught by Resolve");
1942 case Operator.Subtraction:
1944 ig.Emit (OpCodes.Neg);
1947 case Operator.Negate:
1949 ig.Emit (OpCodes.Ldc_I4_0);
1950 ig.Emit (OpCodes.Ceq);
1953 case Operator.BitComplement:
1955 ig.Emit (OpCodes.Not);
1958 case Operator.AddressOf:
1959 ((LValue)expr).AddressOf (ec);
1962 case Operator.Indirection:
1963 throw new Exception ("Not implemented yet");
1965 case Operator.PreIncrement:
1966 case Operator.PreDecrement:
1967 if (expr.ExprClass == ExprClass.Variable){
1969 // Resolve already verified that it is an "incrementable"
1972 ig.Emit (OpCodes.Ldc_I4_1);
1974 if (oper == Operator.PreDecrement)
1975 ig.Emit (OpCodes.Sub);
1977 ig.Emit (OpCodes.Add);
1978 ig.Emit (OpCodes.Dup);
1979 ((LValue) expr).Store (ec);
1981 throw new Exception ("Handle Indexers and Properties here");
1985 case Operator.PostIncrement:
1986 case Operator.PostDecrement:
1987 if (expr.ExprClass == ExprClass.Variable){
1989 // Resolve already verified that it is an "incrementable"
1992 ig.Emit (OpCodes.Dup);
1993 ig.Emit (OpCodes.Ldc_I4_1);
1995 if (oper == Operator.PostDecrement)
1996 ig.Emit (OpCodes.Sub);
1998 ig.Emit (OpCodes.Add);
1999 ((LValue) expr).Store (ec);
2001 throw new Exception ("Handle Indexers and Properties here");
2006 throw new Exception ("This should not happen: Operator = "
2007 + oper.ToString ());
2012 public override void EmitStatement (EmitContext ec)
2015 // FIXME: we should rewrite this code to generate
2016 // better code for ++ and -- as we know we wont need
2017 // the values on the stack
2020 ec.ig.Emit (OpCodes.Pop);
2024 public class Probe : Expression {
2025 public readonly string ProbeType;
2026 public readonly Operator Oper;
2030 public enum Operator {
2034 public Probe (Operator oper, Expression expr, string probe_type)
2037 ProbeType = probe_type;
2041 public Expression Expr {
2047 public override Expression DoResolve (TypeContainer tc)
2049 probe_type = tc.LookupType (ProbeType, false);
2051 if (probe_type == null)
2054 expr = expr.Resolve (tc);
2056 type = TypeManager.bool_type;
2057 eclass = ExprClass.Value;
2062 public override void Emit (EmitContext ec)
2064 ILGenerator ig = ec.ig;
2068 if (Oper == Operator.Is){
2069 ig.Emit (OpCodes.Isinst, probe_type);
2070 ig.Emit (OpCodes.Ldnull);
2071 ig.Emit (OpCodes.Cgt_Un);
2073 ig.Emit (OpCodes.Isinst, probe_type);
2079 // This represents a typecast in the source language.
2081 // FIXME: Cast expressions have an unusual set of parsing
2082 // rules, we need to figure those out.
2084 public class Cast : Expression {
2089 public Cast (string cast_type, Expression expr, Location loc)
2091 this.target_type = cast_type;
2093 this.location = loc;
2096 public string TargetType {
2102 public Expression Expr {
2111 public override Expression DoResolve (TypeContainer tc)
2113 expr = expr.Resolve (tc);
2117 type = tc.LookupType (target_type, false);
2118 eclass = ExprClass.Value;
2123 expr = ConvertExplicit (tc, expr, type, location);
2128 public override void Emit (EmitContext ec)
2131 // This one will never happen
2133 throw new Exception ("Should not happen");
2137 public class Binary : Expression {
2138 public enum Operator {
2139 Multiply, Division, Modulus,
2140 Addition, Subtraction,
2141 LeftShift, RightShift,
2142 LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
2143 Equality, Inequality,
2152 Expression left, right;
2154 ArrayList Arguments;
2158 public Binary (Operator oper, Expression left, Expression right, Location loc)
2163 this.location = loc;
2166 public Operator Oper {
2175 public Expression Left {
2184 public Expression Right {
2195 // Returns a stringified representation of the Operator
2200 case Operator.Multiply:
2202 case Operator.Division:
2204 case Operator.Modulus:
2206 case Operator.Addition:
2208 case Operator.Subtraction:
2210 case Operator.LeftShift:
2212 case Operator.RightShift:
2214 case Operator.LessThan:
2216 case Operator.GreaterThan:
2218 case Operator.LessThanOrEqual:
2220 case Operator.GreaterThanOrEqual:
2222 case Operator.Equality:
2224 case Operator.Inequality:
2226 case Operator.BitwiseAnd:
2228 case Operator.BitwiseOr:
2230 case Operator.ExclusiveOr:
2232 case Operator.LogicalOr:
2234 case Operator.LogicalAnd:
2238 return oper.ToString ();
2241 Expression ForceConversion (TypeContainer tc, Expression expr, Type target_type)
2243 if (expr.Type == target_type)
2246 return ConvertImplicit (tc, expr, target_type, new Location (-1));
2250 // Note that handling the case l == Decimal || r == Decimal
2251 // is taken care of by the Step 1 Operator Overload resolution.
2253 void DoNumericPromotions (TypeContainer tc, Type l, Type r)
2255 if (l == TypeManager.double_type || r == TypeManager.double_type){
2257 // If either operand is of type double, the other operand is
2258 // conveted to type double.
2260 if (r != TypeManager.double_type)
2261 right = ConvertImplicit (tc, right, TypeManager.double_type, location);
2262 if (l != TypeManager.double_type)
2263 left = ConvertImplicit (tc, left, TypeManager.double_type, location);
2265 type = TypeManager.double_type;
2266 } else if (l == TypeManager.float_type || r == TypeManager.float_type){
2268 // if either operand is of type float, th eother operand is
2269 // converd to type float.
2271 if (r != TypeManager.double_type)
2272 right = ConvertImplicit (tc, right, TypeManager.float_type, location);
2273 if (l != TypeManager.double_type)
2274 left = ConvertImplicit (tc, left, TypeManager.float_type, location);
2275 type = TypeManager.float_type;
2276 } else if (l == TypeManager.uint64_type || r == TypeManager.uint64_type){
2280 // If either operand is of type ulong, the other operand is
2281 // converted to type ulong. or an error ocurrs if the other
2282 // operand is of type sbyte, short, int or long
2285 if (l == TypeManager.uint64_type){
2286 if (r != TypeManager.uint64_type && right is IntLiteral){
2287 e = TryImplicitIntConversion (l, (IntLiteral) right);
2293 if (left is IntLiteral){
2294 e = TryImplicitIntConversion (r, (IntLiteral) left);
2301 if ((other == TypeManager.sbyte_type) ||
2302 (other == TypeManager.short_type) ||
2303 (other == TypeManager.int32_type) ||
2304 (other == TypeManager.int64_type)){
2305 string oper = OperName ();
2307 Error (tc, 34, location, "Operator `" + OperName ()
2308 + "' is ambiguous on operands of type `"
2309 + TypeManager.CSharpName (l) + "' "
2310 + "and `" + TypeManager.CSharpName (r)
2313 type = TypeManager.uint64_type;
2314 } else if (l == TypeManager.int64_type || r == TypeManager.int64_type){
2316 // If either operand is of type long, the other operand is converted
2319 if (l != TypeManager.int64_type)
2320 left = ConvertImplicit (tc, left, TypeManager.int64_type, location);
2321 if (r != TypeManager.int64_type)
2322 right = ConvertImplicit (tc, right, TypeManager.int64_type, location);
2324 type = TypeManager.int64_type;
2325 } else if (l == TypeManager.uint32_type || r == TypeManager.uint32_type){
2327 // If either operand is of type uint, and the other
2328 // operand is of type sbyte, short or int, othe operands are
2329 // converted to type long.
2333 if (l == TypeManager.uint32_type)
2335 else if (r == TypeManager.uint32_type)
2338 if ((other == TypeManager.sbyte_type) ||
2339 (other == TypeManager.short_type) ||
2340 (other == TypeManager.int32_type)){
2341 left = ForceConversion (tc, left, TypeManager.int64_type);
2342 right = ForceConversion (tc, right, TypeManager.int64_type);
2343 type = TypeManager.int64_type;
2346 // if either operand is of type uint, the other
2347 // operand is converd to type uint
2349 left = ForceConversion (tc, left, TypeManager.uint32_type);
2350 right = ForceConversion (tc, right, TypeManager.uint32_type);
2351 type = TypeManager.uint32_type;
2353 } else if (l == TypeManager.decimal_type || r == TypeManager.decimal_type){
2354 if (l != TypeManager.decimal_type)
2355 left = ConvertImplicit (tc, left, TypeManager.decimal_type, location);
2356 if (r != TypeManager.decimal_type)
2357 right = ConvertImplicit (tc, right, TypeManager.decimal_type, location);
2359 type = TypeManager.decimal_type;
2361 Expression l_tmp, r_tmp;
2363 l_tmp = ForceConversion (tc, left, TypeManager.int32_type);
2364 if (l_tmp == null) {
2370 r_tmp = ForceConversion (tc, right, TypeManager.int32_type);
2371 if (r_tmp == null) {
2377 type = TypeManager.int32_type;
2381 void error19 (TypeContainer tc)
2383 Error (tc, 19, location,
2384 "Operator " + OperName () + " cannot be applied to operands of type `" +
2385 TypeManager.CSharpName (left.Type) + "' and `" +
2386 TypeManager.CSharpName (right.Type) + "'");
2390 Expression CheckShiftArguments (TypeContainer tc)
2394 Type r = right.Type;
2396 e = ForceConversion (tc, right, TypeManager.int32_type);
2403 Location loc = location;
2405 if (((e = ConvertImplicit (tc, left, TypeManager.int32_type, loc)) != null) ||
2406 ((e = ConvertImplicit (tc, left, TypeManager.uint32_type, loc)) != null) ||
2407 ((e = ConvertImplicit (tc, left, TypeManager.int64_type, loc)) != null) ||
2408 ((e = ConvertImplicit (tc, left, TypeManager.uint64_type, loc)) != null)){
2418 Expression ResolveOperator (TypeContainer tc)
2421 Type r = right.Type;
2424 // Step 1: Perform Operator Overload location
2426 Expression left_expr, right_expr;
2428 string op = "op_" + oper;
2430 left_expr = MemberLookup (tc, l, op, false);
2431 if (left_expr == null && l.BaseType != null)
2432 left_expr = MemberLookup (tc, l.BaseType, op, false);
2434 right_expr = MemberLookup (tc, r, op, false);
2435 if (right_expr == null && r.BaseType != null)
2436 right_expr = MemberLookup (tc, r.BaseType, op, false);
2438 MethodGroupExpr union = Invocation.MakeUnionSet (left_expr, right_expr);
2440 if (union != null) {
2441 Arguments = new ArrayList ();
2442 Arguments.Add (new Argument (left, Argument.AType.Expression));
2443 Arguments.Add (new Argument (right, Argument.AType.Expression));
2445 method = Invocation.OverloadResolve (tc, union, Arguments, location);
2446 if (method != null) {
2447 MethodInfo mi = (MethodInfo) method;
2448 type = mi.ReturnType;
2457 // Step 2: Default operations on CLI native types.
2460 // Only perform numeric promotions on:
2461 // +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
2463 if (oper == Operator.Addition){
2465 // If any of the arguments is a string, cast to string
2467 if (l == TypeManager.string_type){
2468 if (r == TypeManager.string_type){
2470 method = TypeManager.string_concat_string_string;
2473 method = TypeManager.string_concat_object_object;
2474 right = ConvertImplicit (tc, right,
2475 TypeManager.object_type, location);
2477 type = TypeManager.string_type;
2479 Arguments = new ArrayList ();
2480 Arguments.Add (new Argument (left, Argument.AType.Expression));
2481 Arguments.Add (new Argument (right, Argument.AType.Expression));
2485 } else if (r == TypeManager.string_type){
2487 method = TypeManager.string_concat_object_object;
2488 Arguments = new ArrayList ();
2489 Arguments.Add (new Argument (left, Argument.AType.Expression));
2490 Arguments.Add (new Argument (right, Argument.AType.Expression));
2492 left = ConvertImplicit (tc, left, TypeManager.object_type, location);
2493 type = TypeManager.string_type;
2499 // FIXME: is Delegate operator + (D x, D y) handled?
2503 if (oper == Operator.LeftShift || oper == Operator.RightShift)
2504 return CheckShiftArguments (tc);
2506 if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
2507 if (l != TypeManager.bool_type || r != TypeManager.bool_type)
2510 type = TypeManager.bool_type;
2515 // We are dealing with numbers
2518 DoNumericPromotions (tc, l, r);
2520 if (left == null || right == null)
2524 if (oper == Operator.BitwiseAnd ||
2525 oper == Operator.BitwiseOr ||
2526 oper == Operator.ExclusiveOr){
2527 if (!((l == TypeManager.int32_type) ||
2528 (l == TypeManager.uint32_type) ||
2529 (l == TypeManager.int64_type) ||
2530 (l == TypeManager.uint64_type))){
2537 if (oper == Operator.Equality ||
2538 oper == Operator.Inequality ||
2539 oper == Operator.LessThanOrEqual ||
2540 oper == Operator.LessThan ||
2541 oper == Operator.GreaterThanOrEqual ||
2542 oper == Operator.GreaterThan){
2543 type = TypeManager.bool_type;
2549 public override Expression DoResolve (TypeContainer tc)
2551 left = left.Resolve (tc);
2552 right = right.Resolve (tc);
2554 if (left == null || right == null)
2557 if (left.Type == null)
2558 throw new Exception (
2559 "Resolve returned non null, but did not set the type! (" +
2561 if (right.Type == null)
2562 throw new Exception (
2563 "Resolve returned non null, but did not set the type! (" +
2566 eclass = ExprClass.Value;
2568 return ResolveOperator (tc);
2571 public bool IsBranchable ()
2573 if (oper == Operator.Equality ||
2574 oper == Operator.Inequality ||
2575 oper == Operator.LessThan ||
2576 oper == Operator.GreaterThan ||
2577 oper == Operator.LessThanOrEqual ||
2578 oper == Operator.GreaterThanOrEqual){
2585 // This entry point is used by routines that might want
2586 // to emit a brfalse/brtrue after an expression, and instead
2587 // they could use a more compact notation.
2589 // Typically the code would generate l.emit/r.emit, followed
2590 // by the comparission and then a brtrue/brfalse. The comparissions
2591 // are sometimes inneficient (there are not as complete as the branches
2592 // look for the hacks in Emit using double ceqs).
2594 // So for those cases we provide EmitBranchable that can emit the
2595 // branch with the test
2597 public void EmitBranchable (EmitContext ec, int target)
2600 bool close_target = false;
2606 case Operator.Equality:
2608 opcode = OpCodes.Beq_S;
2610 opcode = OpCodes.Beq;
2613 case Operator.Inequality:
2615 opcode = OpCodes.Bne_Un_S;
2617 opcode = OpCodes.Bne_Un;
2620 case Operator.LessThan:
2622 opcode = OpCodes.Blt_S;
2624 opcode = OpCodes.Blt;
2627 case Operator.GreaterThan:
2629 opcode = OpCodes.Bgt_S;
2631 opcode = OpCodes.Bgt;
2634 case Operator.LessThanOrEqual:
2636 opcode = OpCodes.Ble_S;
2638 opcode = OpCodes.Ble;
2641 case Operator.GreaterThanOrEqual:
2643 opcode = OpCodes.Bge_S;
2645 opcode = OpCodes.Ble;
2649 throw new Exception ("EmitBranchable called on non-EmitBranchable operator: "
2650 + oper.ToString ());
2653 ec.ig.Emit (opcode, target);
2656 public override void Emit (EmitContext ec)
2658 ILGenerator ig = ec.ig;
2660 Type r = right.Type;
2663 if (method != null) {
2665 // Note that operators are static anyway
2667 if (Arguments != null)
2668 Invocation.EmitArguments (ec, method, Arguments);
2670 if (method is MethodInfo)
2671 ig.Emit (OpCodes.Call, (MethodInfo) method);
2673 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
2682 case Operator.Multiply:
2684 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2685 opcode = OpCodes.Mul_Ovf;
2686 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2687 opcode = OpCodes.Mul_Ovf_Un;
2689 opcode = OpCodes.Mul;
2691 opcode = OpCodes.Mul;
2695 case Operator.Division:
2696 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2697 opcode = OpCodes.Div_Un;
2699 opcode = OpCodes.Div;
2702 case Operator.Modulus:
2703 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2704 opcode = OpCodes.Rem_Un;
2706 opcode = OpCodes.Rem;
2709 case Operator.Addition:
2711 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2712 opcode = OpCodes.Add_Ovf;
2713 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2714 opcode = OpCodes.Add_Ovf_Un;
2716 opcode = OpCodes.Mul;
2718 opcode = OpCodes.Add;
2721 case Operator.Subtraction:
2723 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2724 opcode = OpCodes.Sub_Ovf;
2725 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2726 opcode = OpCodes.Sub_Ovf_Un;
2728 opcode = OpCodes.Sub;
2730 opcode = OpCodes.Sub;
2733 case Operator.RightShift:
2734 opcode = OpCodes.Shr;
2737 case Operator.LeftShift:
2738 opcode = OpCodes.Shl;
2741 case Operator.Equality:
2742 opcode = OpCodes.Ceq;
2745 case Operator.Inequality:
2746 ec.ig.Emit (OpCodes.Ceq);
2747 ec.ig.Emit (OpCodes.Ldc_I4_0);
2749 opcode = OpCodes.Ceq;
2752 case Operator.LessThan:
2753 opcode = OpCodes.Clt;
2756 case Operator.GreaterThan:
2757 opcode = OpCodes.Cgt;
2760 case Operator.LessThanOrEqual:
2761 ec.ig.Emit (OpCodes.Cgt);
2762 ec.ig.Emit (OpCodes.Ldc_I4_0);
2764 opcode = OpCodes.Ceq;
2767 case Operator.GreaterThanOrEqual:
2768 ec.ig.Emit (OpCodes.Clt);
2769 ec.ig.Emit (OpCodes.Ldc_I4_1);
2771 opcode = OpCodes.Sub;
2774 case Operator.LogicalOr:
2775 case Operator.BitwiseOr:
2776 opcode = OpCodes.Or;
2779 case Operator.LogicalAnd:
2780 case Operator.BitwiseAnd:
2781 opcode = OpCodes.And;
2784 case Operator.ExclusiveOr:
2785 opcode = OpCodes.Xor;
2789 throw new Exception ("This should not happen: Operator = "
2790 + oper.ToString ());
2797 public class Conditional : Expression {
2798 Expression expr, trueExpr, falseExpr;
2801 public Conditional (Expression expr, Expression trueExpr, Expression falseExpr, Location l)
2804 this.trueExpr = trueExpr;
2805 this.falseExpr = falseExpr;
2809 public Expression Expr {
2815 public Expression TrueExpr {
2821 public Expression FalseExpr {
2827 public override Expression DoResolve (TypeContainer tc)
2829 expr = expr.Resolve (tc);
2831 if (expr.Type != TypeManager.bool_type)
2832 expr = Expression.ConvertImplicitRequired (
2833 tc, expr, TypeManager.bool_type, l);
2835 trueExpr = trueExpr.Resolve (tc);
2836 falseExpr = falseExpr.Resolve (tc);
2838 if (expr == null || trueExpr == null || falseExpr == null)
2841 if (trueExpr.Type == falseExpr.Type)
2842 type = trueExpr.Type;
2847 // First, if an implicit conversion exists from trueExpr
2848 // to falseExpr, then the result type is of type falseExpr.Type
2850 conv = ConvertImplicit (tc, trueExpr, falseExpr.Type, l);
2852 type = falseExpr.Type;
2854 } else if ((conv = ConvertImplicit (tc,falseExpr,trueExpr.Type,l)) != null){
2855 type = trueExpr.Type;
2858 Error (tc, 173, l, "The type of the conditional expression can " +
2859 "not be computed because there is no implicit conversion" +
2860 " from `" + TypeManager.CSharpName (trueExpr.Type) + "'" +
2861 " and `" + TypeManager.CSharpName (falseExpr.Type) + "'");
2866 eclass = ExprClass.Value;
2870 public override void Emit (EmitContext ec)
2872 ILGenerator ig = ec.ig;
2873 Label false_target = ig.DefineLabel ();
2874 Label end_target = ig.DefineLabel ();
2877 ig.Emit (OpCodes.Brfalse, false_target);
2879 ig.Emit (OpCodes.Br, end_target);
2880 ig.MarkLabel (false_target);
2881 falseExpr.Emit (ec);
2882 ig.MarkLabel (end_target);
2886 public class SimpleName : Expression {
2887 public readonly string Name;
2888 public readonly Location Location;
2890 public SimpleName (string name, Location l)
2897 // Checks whether we are trying to access an instance
2898 // property, method or field from a static body.
2900 Expression MemberStaticCheck (Expression e)
2902 if (e is FieldExpr){
2903 FieldInfo fi = ((FieldExpr) e).FieldInfo;
2908 "An object reference is required " +
2909 "for the non-static field `"+Name+"'");
2912 } else if (e is MethodGroupExpr){
2913 // FIXME: Pending reorganization of MemberLookup
2914 // Basically at this point we should have the
2915 // best match already selected for us, and
2916 // we should only have to check a *single*
2917 // Method for its static on/off bit.
2919 } else if (e is PropertyExpr){
2920 if (!((PropertyExpr) e).IsStatic){
2922 "An object reference is required " +
2923 "for the non-static property access `"+
2933 // 7.5.2: Simple Names.
2935 // Local Variables and Parameters are handled at
2936 // parse time, so they never occur as SimpleNames.
2938 Expression ResolveSimpleName (TypeContainer tc)
2942 e = MemberLookup (tc, tc.TypeBuilder, Name, true);
2946 else if (e is FieldExpr){
2947 FieldExpr fe = (FieldExpr) e;
2949 if (!fe.FieldInfo.IsStatic)
2950 fe.Instance = new This ();
2953 if ((tc.ModFlags & Modifiers.STATIC) != 0)
2954 return MemberStaticCheck (e);
2960 // Do step 3 of the Simple Name resolution.
2962 // FIXME: implement me.
2964 Error (tc, 103, Location, "The name `" + Name + "' does not exist in the class `" +
2971 // SimpleName needs to handle a multitude of cases:
2973 // simple_names and qualified_identifiers are placed on
2974 // the tree equally.
2976 public override Expression DoResolve (TypeContainer tc)
2978 if (Name.IndexOf (".") != -1)
2979 return ResolveMemberAccess (tc, Name);
2981 return ResolveSimpleName (tc);
2984 public override void Emit (EmitContext ec)
2986 throw new Exception ("SimpleNames should be gone from the tree");
2991 // A simple interface that should be implemeneted by LValues
2993 public interface LValue {
2996 // The Store method should store the contents of the top
2997 // of the stack into the storage that is implemented by
2998 // the particular implementation of LValue
3000 void Store (EmitContext ec);
3003 // The AddressOf method should generate code that loads
3004 // the address of the LValue and leaves it on the stack
3006 void AddressOf (EmitContext ec);
3009 public class LocalVariableReference : Expression, LValue {
3010 public readonly string Name;
3011 public readonly Block Block;
3013 public LocalVariableReference (Block block, string name)
3017 eclass = ExprClass.Variable;
3020 public VariableInfo VariableInfo {
3022 return Block.GetVariableInfo (Name);
3026 public override Expression DoResolve (TypeContainer tc)
3028 VariableInfo vi = Block.GetVariableInfo (Name);
3030 type = vi.VariableType;
3034 public override void Emit (EmitContext ec)
3036 VariableInfo vi = VariableInfo;
3037 ILGenerator ig = ec.ig;
3044 ig.Emit (OpCodes.Ldloc_0);
3048 ig.Emit (OpCodes.Ldloc_1);
3052 ig.Emit (OpCodes.Ldloc_2);
3056 ig.Emit (OpCodes.Ldloc_3);
3061 ig.Emit (OpCodes.Ldloc_S, (byte) idx);
3063 ig.Emit (OpCodes.Ldloc, idx);
3068 public static void Store (ILGenerator ig, int idx)
3072 ig.Emit (OpCodes.Stloc_0);
3076 ig.Emit (OpCodes.Stloc_1);
3080 ig.Emit (OpCodes.Stloc_2);
3084 ig.Emit (OpCodes.Stloc_3);
3089 ig.Emit (OpCodes.Stloc_S, (byte) idx);
3091 ig.Emit (OpCodes.Stloc, idx);
3096 public void Store (EmitContext ec)
3098 ILGenerator ig = ec.ig;
3099 VariableInfo vi = VariableInfo;
3103 // Funny seems the above generates optimal code for us, but
3104 // seems to take too long to generate what we need.
3105 // ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
3110 public void AddressOf (EmitContext ec)
3112 VariableInfo vi = VariableInfo;
3119 ec.ig.Emit (OpCodes.Ldloca_S, (byte) idx);
3121 ec.ig.Emit (OpCodes.Ldloca, idx);
3125 public class ParameterReference : Expression, LValue {
3126 public readonly Parameters Pars;
3127 public readonly String Name;
3128 public readonly int Idx;
3130 public ParameterReference (Parameters pars, int idx, string name)
3135 eclass = ExprClass.Variable;
3138 public override Expression DoResolve (TypeContainer tc)
3140 Type [] types = Pars.GetParameterInfo (tc);
3147 public override void Emit (EmitContext ec)
3150 ec.ig.Emit (OpCodes.Ldarg_S, (byte) Idx);
3152 ec.ig.Emit (OpCodes.Ldarg, Idx);
3155 public void Store (EmitContext ec)
3158 ec.ig.Emit (OpCodes.Starg_S, (byte) Idx);
3160 ec.ig.Emit (OpCodes.Starg, Idx);
3164 public void AddressOf (EmitContext ec)
3167 ec.ig.Emit (OpCodes.Ldarga_S, (byte) Idx);
3169 ec.ig.Emit (OpCodes.Ldarga, Idx);
3174 // Used for arguments to New(), Invocation()
3176 public class Argument {
3183 public readonly AType Type;
3186 public Argument (Expression expr, AType type)
3192 public Expression Expr {
3202 public bool Resolve (TypeContainer tc)
3204 expr = expr.Resolve (tc);
3206 return expr != null;
3209 public void Emit (EmitContext ec)
3216 // Invocation of methods or delegates.
3218 public class Invocation : ExpressionStatement {
3219 public readonly ArrayList Arguments;
3220 public readonly Location Location;
3223 MethodBase method = null;
3225 static Hashtable method_parameter_cache;
3227 static Invocation ()
3229 method_parameter_cache = new Hashtable ();
3233 // arguments is an ArrayList, but we do not want to typecast,
3234 // as it might be null.
3236 // FIXME: only allow expr to be a method invocation or a
3237 // delegate invocation (7.5.5)
3239 public Invocation (Expression expr, ArrayList arguments, Location l)
3242 Arguments = arguments;
3246 public Expression Expr {
3253 // Returns the Parameters (a ParameterData interface) for the
3256 public static ParameterData GetParameterData (MethodBase mb)
3258 object pd = method_parameter_cache [mb];
3261 return (ParameterData) pd;
3263 if (mb is MethodBuilder || mb is ConstructorBuilder){
3264 MethodCore mc = TypeContainer.LookupMethodByBuilder (mb);
3266 InternalParameters ip = mc.ParameterInfo;
3267 method_parameter_cache [mb] = ip;
3269 return (ParameterData) ip;
3271 ParameterInfo [] pi = mb.GetParameters ();
3272 ReflectionParameters rp = new ReflectionParameters (pi);
3273 method_parameter_cache [mb] = rp;
3275 return (ParameterData) rp;
3280 // Tells whether a user defined conversion from Type `from' to
3281 // Type `to' exists.
3283 // FIXME: we could implement a cache here.
3285 static bool ConversionExists (TypeContainer tc, Type from, Type to)
3287 // Locate user-defined implicit operators
3291 mg = MemberLookup (tc, to, "op_Implicit", false);
3294 MethodGroupExpr me = (MethodGroupExpr) mg;
3296 for (int i = me.Methods.Length; i > 0;) {
3298 MethodBase mb = me.Methods [i];
3299 ParameterData pd = GetParameterData (mb);
3301 if (from == pd.ParameterType (0))
3306 mg = MemberLookup (tc, from, "op_Implicit", false);
3309 MethodGroupExpr me = (MethodGroupExpr) mg;
3311 for (int i = me.Methods.Length; i > 0;) {
3313 MethodBase mb = me.Methods [i];
3314 MethodInfo mi = (MethodInfo) mb;
3316 if (mi.ReturnType == to)
3325 // Determines "better conversion" as specified in 7.4.2.3
3326 // Returns : 1 if a->p is better
3327 // 0 if a->q or neither is better
3329 static int BetterConversion (TypeContainer tc, Argument a, Type p, Type q, bool use_standard)
3332 Type argument_type = a.Expr.Type;
3333 Expression argument_expr = a.Expr;
3335 if (argument_type == null)
3336 throw new Exception ("Expression of type " + a.Expr + " does not resolve its type");
3341 if (argument_type == p)
3344 if (argument_type == q)
3348 // Now probe whether an implicit constant expression conversion
3351 // An implicit constant expression conversion permits the following
3354 // * A constant-expression of type `int' can be converted to type
3355 // sbyte, byute, short, ushort, uint, ulong provided the value of
3356 // of the expression is withing the range of the destination type.
3358 // * A constant-expression of type long can be converted to type
3359 // ulong, provided the value of the constant expression is not negative
3361 // FIXME: Note that this assumes that constant folding has
3362 // taken place. We dont do constant folding yet.
3365 if (argument_expr is IntLiteral){
3366 IntLiteral ei = (IntLiteral) argument_expr;
3367 int value = ei.Value;
3369 if (p == TypeManager.sbyte_type){
3370 if (value >= SByte.MinValue && value <= SByte.MaxValue)
3372 } else if (p == TypeManager.byte_type){
3373 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
3375 } else if (p == TypeManager.short_type){
3376 if (value >= Int16.MinValue && value <= Int16.MaxValue)
3378 } else if (p == TypeManager.ushort_type){
3379 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
3381 } else if (p == TypeManager.uint32_type){
3383 // we can optimize this case: a positive int32
3384 // always fits on a uint32
3388 } else if (p == TypeManager.uint64_type){
3390 // we can optimize this case: a positive int32
3391 // always fits on a uint64
3396 } else if (argument_type == TypeManager.int64_type && argument_expr is LongLiteral){
3397 LongLiteral ll = (LongLiteral) argument_expr;
3399 if (p == TypeManager.uint64_type){
3410 tmp = ConvertImplicitStandard (tc, argument_expr, p, Location.Null);
3412 tmp = ConvertImplicit (tc, argument_expr, p, Location.Null);
3421 if (ConversionExists (tc, p, q) == true &&
3422 ConversionExists (tc, q, p) == false)
3425 if (p == TypeManager.sbyte_type)
3426 if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
3427 q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3430 if (p == TypeManager.short_type)
3431 if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
3432 q == TypeManager.uint64_type)
3435 if (p == TypeManager.int32_type)
3436 if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3439 if (p == TypeManager.int64_type)
3440 if (q == TypeManager.uint64_type)
3447 // Determines "Better function" and returns an integer indicating :
3448 // 0 if candidate ain't better
3449 // 1 if candidate is better than the current best match
3451 static int BetterFunction (TypeContainer tc, ArrayList args,
3452 MethodBase candidate, MethodBase best,
3455 ParameterData candidate_pd = GetParameterData (candidate);
3456 ParameterData best_pd;
3462 argument_count = args.Count;
3464 if (candidate_pd.Count == 0 && argument_count == 0)
3468 if (candidate_pd.Count == argument_count) {
3470 for (int j = argument_count; j > 0;) {
3473 Argument a = (Argument) args [j];
3475 x = BetterConversion (
3476 tc, a, candidate_pd.ParameterType (j), null,
3492 best_pd = GetParameterData (best);
3494 if (candidate_pd.Count == argument_count && best_pd.Count == argument_count) {
3495 int rating1 = 0, rating2 = 0;
3497 for (int j = argument_count; j > 0;) {
3501 Argument a = (Argument) args [j];
3503 x = BetterConversion (tc, a, candidate_pd.ParameterType (j),
3504 best_pd.ParameterType (j), use_standard);
3505 y = BetterConversion (tc, a, best_pd.ParameterType (j),
3506 candidate_pd.ParameterType (j), use_standard);
3512 if (rating1 > rating2)
3521 public static string FullMethodDesc (MethodBase mb)
3523 StringBuilder sb = new StringBuilder (mb.Name);
3524 ParameterData pd = GetParameterData (mb);
3527 for (int i = pd.Count; i > 0;) {
3529 sb.Append (TypeManager.CSharpName (pd.ParameterType (i)));
3535 return sb.ToString ();
3538 public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2)
3540 MemberInfo [] miset;
3541 MethodGroupExpr union;
3543 if (mg1 != null && mg2 != null) {
3545 MethodGroupExpr left_set = null, right_set = null;
3546 int length1 = 0, length2 = 0;
3548 left_set = (MethodGroupExpr) mg1;
3549 length1 = left_set.Methods.Length;
3551 right_set = (MethodGroupExpr) mg2;
3552 length2 = right_set.Methods.Length;
3554 ArrayList common = new ArrayList ();
3556 for (int i = 0; i < left_set.Methods.Length; i++) {
3557 for (int j = 0; j < right_set.Methods.Length; j++) {
3558 if (left_set.Methods [i] == right_set.Methods [j])
3559 common.Add (left_set.Methods [i]);
3563 miset = new MemberInfo [length1 + length2 - common.Count];
3565 left_set.Methods.CopyTo (miset, 0);
3569 for (int j = 0; j < right_set.Methods.Length; j++)
3570 if (!common.Contains (right_set.Methods [j]))
3571 miset [length1 + k++] = right_set.Methods [j];
3573 union = new MethodGroupExpr (miset);
3577 } else if (mg1 == null && mg2 != null) {
3579 MethodGroupExpr me = (MethodGroupExpr) mg2;
3581 miset = new MemberInfo [me.Methods.Length];
3582 me.Methods.CopyTo (miset, 0);
3584 union = new MethodGroupExpr (miset);
3588 } else if (mg2 == null && mg1 != null) {
3590 MethodGroupExpr me = (MethodGroupExpr) mg1;
3592 miset = new MemberInfo [me.Methods.Length];
3593 me.Methods.CopyTo (miset, 0);
3595 union = new MethodGroupExpr (miset);
3604 // Find the Applicable Function Members (7.4.2.1)
3606 // me: Method Group expression with the members to select.
3607 // it might contain constructors or methods (or anything
3608 // that maps to a method).
3610 // Arguments: ArrayList containing resolved Argument objects.
3612 // loc: The location if we want an error to be reported, or a Null
3613 // location for "probing" purposes.
3615 // inside_user_defined: controls whether OverloadResolve should use the
3616 // ConvertImplicit or ConvertImplicitStandard during overload resolution.
3618 // Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
3619 // that is the best match of me on Arguments.
3622 public static MethodBase OverloadResolve (TypeContainer tc, MethodGroupExpr me,
3623 ArrayList Arguments, Location loc,
3626 ArrayList afm = new ArrayList ();
3627 int best_match_idx = -1;
3628 MethodBase method = null;
3631 for (int i = me.Methods.Length; i > 0; ){
3633 MethodBase candidate = me.Methods [i];
3636 x = BetterFunction (tc, Arguments, candidate, method, use_standard);
3642 method = me.Methods [best_match_idx];
3646 if (Arguments == null)
3649 argument_count = Arguments.Count;
3653 // Now we see if we can at least find a method with the same number of arguments
3654 // and then try doing implicit conversion on the arguments
3655 if (best_match_idx == -1) {
3657 for (int i = me.Methods.Length; i > 0;) {
3659 MethodBase mb = me.Methods [i];
3660 pd = GetParameterData (mb);
3662 if (pd.Count == argument_count) {
3664 method = me.Methods [best_match_idx];
3675 // And now convert implicitly, each argument to the required type
3677 pd = GetParameterData (method);
3679 for (int j = argument_count; j > 0;) {
3681 Argument a = (Argument) Arguments [j];
3682 Expression a_expr = a.Expr;
3683 Type parameter_type = pd.ParameterType (j);
3685 if (a_expr.Type != parameter_type){
3689 conv = ConvertImplicitStandard (tc, a_expr, parameter_type,
3692 conv = ConvertImplicit (tc, a_expr, parameter_type,
3696 if (!Location.IsNull (loc)) {
3697 Error (tc, 1502, loc,
3698 "The best overloaded match for method '" + FullMethodDesc (method) +
3699 "' has some invalid arguments");
3700 Error (tc, 1503, loc,
3701 "Argument " + (j+1) +
3702 ": Cannot convert from '" + TypeManager.CSharpName (a_expr.Type)
3703 + "' to '" + TypeManager.CSharpName (pd.ParameterType (j)) + "'");
3708 // Update the argument with the implicit conversion
3718 public static MethodBase OverloadResolve (TypeContainer tc, MethodGroupExpr me,
3719 ArrayList Arguments, Location loc)
3721 return OverloadResolve (tc, me, Arguments, loc, false);
3724 public override Expression DoResolve (TypeContainer tc)
3727 // First, resolve the expression that is used to
3728 // trigger the invocation
3730 this.expr = expr.Resolve (tc);
3731 if (this.expr == null)
3734 if (!(this.expr is MethodGroupExpr)){
3735 report118 (tc, Location, this.expr, "method group");
3740 // Next, evaluate all the expressions in the argument list
3742 if (Arguments != null){
3743 for (int i = Arguments.Count; i > 0;){
3745 Argument a = (Argument) Arguments [i];
3747 if (!a.Resolve (tc))
3752 method = OverloadResolve (tc, (MethodGroupExpr) this.expr, Arguments,
3755 if (method == null){
3756 Error (tc, -6, Location,
3757 "Could not find any applicable function for this argument list");
3761 if (method is MethodInfo)
3762 type = ((MethodInfo)method).ReturnType;
3764 eclass = ExprClass.Value;
3768 public static void EmitArguments (EmitContext ec, MethodBase method, ArrayList Arguments)
3772 if (Arguments != null)
3773 top = Arguments.Count;
3777 for (int i = 0; i < top; i++){
3778 Argument a = (Argument) Arguments [i];
3784 public override void Emit (EmitContext ec)
3786 bool is_static = method.IsStatic;
3789 MethodGroupExpr mg = (MethodGroupExpr) this.expr;
3792 // If this is ourselves, push "this"
3794 if (mg.InstanceExpression == null){
3795 ec.ig.Emit (OpCodes.Ldarg_0);
3798 // Push the instance expression
3800 mg.InstanceExpression.Emit (ec);
3804 if (Arguments != null)
3805 EmitArguments (ec, method, Arguments);
3808 if (method is MethodInfo)
3809 ec.ig.Emit (OpCodes.Call, (MethodInfo) method);
3811 ec.ig.Emit (OpCodes.Call, (ConstructorInfo) method);
3813 if (method is MethodInfo)
3814 ec.ig.Emit (OpCodes.Callvirt, (MethodInfo) method);
3816 ec.ig.Emit (OpCodes.Callvirt, (ConstructorInfo) method);
3820 public override void EmitStatement (EmitContext ec)
3825 // Pop the return value if there is one
3827 if (method is MethodInfo){
3828 if (((MethodInfo)method).ReturnType != TypeManager.void_type)
3829 ec.ig.Emit (OpCodes.Pop);
3834 public class New : ExpressionStatement {
3841 public readonly NType NewType;
3842 public readonly ArrayList Arguments;
3843 public readonly string RequestedType;
3844 // These are for the case when we have an array
3845 public readonly string Rank;
3846 public readonly ArrayList Indices;
3847 public readonly ArrayList Initializers;
3850 MethodBase method = null;
3852 public New (string requested_type, ArrayList arguments, Location loc)
3854 RequestedType = requested_type;
3855 Arguments = arguments;
3856 NewType = NType.Object;
3860 public New (string requested_type, ArrayList exprs, string rank, ArrayList initializers, Location loc)
3862 RequestedType = requested_type;
3865 Initializers = initializers;
3866 NewType = NType.Array;
3870 public override Expression DoResolve (TypeContainer tc)
3872 type = tc.LookupType (RequestedType, false);
3879 ml = MemberLookup (tc, type, ".ctor", false,
3880 MemberTypes.Constructor, AllBindingsFlags);
3882 if (! (ml is MethodGroupExpr)){
3884 // FIXME: Find proper error
3886 report118 (tc, Location, ml, "method group");
3890 if (Arguments != null){
3891 for (int i = Arguments.Count; i > 0;){
3893 Argument a = (Argument) Arguments [i];
3895 if (!a.Resolve (tc))
3900 method = Invocation.OverloadResolve (tc, (MethodGroupExpr) ml, Arguments,
3903 if (method == null) {
3904 Error (tc, -6, Location,
3905 "New invocation: Can not find a constructor for this argument list");
3909 eclass = ExprClass.Value;
3913 public override void Emit (EmitContext ec)
3915 Invocation.EmitArguments (ec, method, Arguments);
3916 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
3919 public override void EmitStatement (EmitContext ec)
3922 ec.ig.Emit (OpCodes.Pop);
3927 // Represents the `this' construct
3929 public class This : Expression, LValue {
3930 public override Expression DoResolve (TypeContainer tc)
3932 eclass = ExprClass.Variable;
3933 type = tc.TypeBuilder;
3936 // FIXME: Verify that this is only used in instance contexts.
3941 public override void Emit (EmitContext ec)
3943 ec.ig.Emit (OpCodes.Ldarg_0);
3946 public void Store (EmitContext ec)
3949 // Assignment to the "this" variable.
3951 // FIXME: Apparently this is a bug that we
3952 // must catch as `this' seems to be readonly ;-)
3954 ec.ig.Emit (OpCodes.Starg, 0);
3957 public void AddressOf (EmitContext ec)
3959 ec.ig.Emit (OpCodes.Ldarga_S, (byte) 0);
3964 // Implements the typeof operator
3966 public class TypeOf : Expression {
3967 public readonly string QueriedType;
3970 public TypeOf (string queried_type)
3972 QueriedType = queried_type;
3975 public override Expression DoResolve (TypeContainer tc)
3977 typearg = tc.LookupType (QueriedType, false);
3979 if (typearg == null)
3982 type = TypeManager.type_type;
3983 eclass = ExprClass.Type;
3987 public override void Emit (EmitContext ec)
3989 ec.ig.Emit (OpCodes.Ldtoken, typearg);
3990 ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
3994 public class SizeOf : Expression {
3995 public readonly string QueriedType;
3997 public SizeOf (string queried_type)
3999 this.QueriedType = queried_type;
4002 public override Expression DoResolve (TypeContainer tc)
4004 // FIXME: Implement;
4005 throw new Exception ("Unimplemented");
4009 public override void Emit (EmitContext ec)
4011 throw new Exception ("Implement me");
4015 public class MemberAccess : Expression {
4016 public readonly string Identifier;
4018 Expression member_lookup;
4020 public MemberAccess (Expression expr, string id)
4026 public Expression Expr {
4032 public override Expression DoResolve (TypeContainer tc)
4034 Expression new_expression = expr.Resolve (tc);
4036 if (new_expression == null)
4039 member_lookup = MemberLookup (tc, expr.Type, Identifier, false);
4041 if (member_lookup is MethodGroupExpr){
4042 MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
4045 // Bind the instance expression to it
4047 // FIXME: This is a horrible way of detecting if it is
4048 // an instance expression. Figure out how to fix this.
4051 if (expr is LocalVariableReference ||
4052 expr is ParameterReference ||
4054 mg.InstanceExpression = expr;
4056 return member_lookup;
4057 } else if (member_lookup is FieldExpr){
4058 FieldExpr fe = (FieldExpr) member_lookup;
4062 return member_lookup;
4065 // FIXME: This should generate the proper node
4066 // ie, for a Property Access, it should like call it
4069 return member_lookup;
4072 public override void Emit (EmitContext ec)
4074 throw new Exception ("Should not happen I think");
4080 // Nodes of type Namespace are created during the semantic
4081 // analysis to resolve member_access/qualified_identifier/simple_name
4084 // They are born `resolved'.
4086 public class NamespaceExpr : Expression {
4087 public readonly string Name;
4089 public NamespaceExpr (string name)
4092 eclass = ExprClass.Namespace;
4095 public override Expression DoResolve (TypeContainer tc)
4100 public override void Emit (EmitContext ec)
4102 throw new Exception ("Namespace expressions should never be emitted");
4107 // Fully resolved expression that evaluates to a type
4109 public class TypeExpr : Expression {
4110 public TypeExpr (Type t)
4113 eclass = ExprClass.Type;
4116 override public Expression DoResolve (TypeContainer tc)
4121 override public void Emit (EmitContext ec)
4123 throw new Exception ("Implement me");
4128 // MethodGroup Expression.
4130 // This is a fully resolved expression that evaluates to a type
4132 public class MethodGroupExpr : Expression {
4133 public readonly MethodBase [] Methods;
4134 Expression instance_expression = null;
4136 public MethodGroupExpr (MemberInfo [] mi)
4138 Methods = new MethodBase [mi.Length];
4139 mi.CopyTo (Methods, 0);
4140 eclass = ExprClass.MethodGroup;
4144 // `A method group may have associated an instance expression'
4146 public Expression InstanceExpression {
4148 return instance_expression;
4152 instance_expression = value;
4156 override public Expression DoResolve (TypeContainer tc)
4161 override public void Emit (EmitContext ec)
4163 throw new Exception ("This should never be reached");
4167 // Fully resolved expression that evaluates to a Field
4169 public class FieldExpr : Expression, LValue {
4170 public readonly FieldInfo FieldInfo;
4171 public Expression Instance;
4173 public FieldExpr (FieldInfo fi)
4176 eclass = ExprClass.Variable;
4177 type = fi.FieldType;
4180 override public Expression DoResolve (TypeContainer tc)
4182 if (!FieldInfo.IsStatic){
4183 if (Instance == null){
4184 throw new Exception ("non-static FieldExpr without instance var\n" +
4185 "You have to assign the Instance variable\n" +
4186 "Of the FieldExpr to set this\n");
4189 Instance = Instance.Resolve (tc);
4190 if (Instance == null)
4197 override public void Emit (EmitContext ec)
4199 ILGenerator ig = ec.ig;
4201 if (FieldInfo.IsStatic)
4202 ig.Emit (OpCodes.Ldsfld, FieldInfo);
4206 ig.Emit (OpCodes.Ldfld, FieldInfo);
4210 public void Store (EmitContext ec)
4212 if (FieldInfo.IsStatic)
4213 ec.ig.Emit (OpCodes.Stsfld, FieldInfo);
4215 ec.ig.Emit (OpCodes.Stfld, FieldInfo);
4218 public void AddressOf (EmitContext ec)
4220 if (FieldInfo.IsStatic)
4221 ec.ig.Emit (OpCodes.Ldsflda, FieldInfo);
4224 ec.ig.Emit (OpCodes.Ldflda, FieldInfo);
4230 // Fully resolved expression that evaluates to a Property
4232 public class PropertyExpr : Expression {
4233 public readonly PropertyInfo PropertyInfo;
4234 public readonly bool IsStatic;
4236 public PropertyExpr (PropertyInfo pi)
4239 eclass = ExprClass.PropertyAccess;
4242 MethodBase [] acc = pi.GetAccessors ();
4244 for (int i = 0; i < acc.Length; i++)
4245 if (acc [i].IsStatic)
4248 type = pi.PropertyType;
4251 override public Expression DoResolve (TypeContainer tc)
4253 // We are born in resolved state.
4257 override public void Emit (EmitContext ec)
4259 // FIXME: Implement;
4260 throw new Exception ("Unimplemented");
4265 // Fully resolved expression that evaluates to a Expression
4267 public class EventExpr : Expression {
4268 public readonly EventInfo EventInfo;
4270 public EventExpr (EventInfo ei)
4273 eclass = ExprClass.EventAccess;
4276 override public Expression DoResolve (TypeContainer tc)
4278 // We are born in resolved state.
4282 override public void Emit (EmitContext ec)
4284 throw new Exception ("Implement me");
4285 // FIXME: Implement.
4289 public class CheckedExpr : Expression {
4291 public Expression Expr;
4293 public CheckedExpr (Expression e)
4298 public override Expression DoResolve (TypeContainer tc)
4300 Expr = Expr.Resolve (tc);
4305 eclass = Expr.ExprClass;
4310 public override void Emit (EmitContext ec)
4312 bool last_check = ec.CheckState;
4314 ec.CheckState = true;
4316 ec.CheckState = last_check;
4321 public class UnCheckedExpr : Expression {
4323 public Expression Expr;
4325 public UnCheckedExpr (Expression e)
4330 public override Expression DoResolve (TypeContainer tc)
4332 Expr = Expr.Resolve (tc);
4337 eclass = Expr.ExprClass;
4342 public override void Emit (EmitContext ec)
4344 bool last_check = ec.CheckState;
4346 ec.CheckState = false;
4348 ec.CheckState = last_check;
4353 public class ElementAccess : Expression {
4355 public readonly ArrayList Arguments;
4356 public readonly Expression Expr;
4358 public ElementAccess (Expression e, ArrayList e_list)
4364 public override Expression DoResolve (TypeContainer tc)
4366 // FIXME: Implement;
4367 throw new Exception ("Unimplemented");
4371 public override void Emit (EmitContext ec)
4373 // FIXME : Implement !
4374 throw new Exception ("Unimplemented");
4379 public class BaseAccess : Expression {
4381 public enum BaseAccessType {
4386 public readonly BaseAccessType BAType;
4387 public readonly string Member;
4388 public readonly ArrayList Arguments;
4390 public BaseAccess (BaseAccessType t, string member, ArrayList args)
4398 public override Expression DoResolve (TypeContainer tc)
4400 // FIXME: Implement;
4401 throw new Exception ("Unimplemented");
4405 public override void Emit (EmitContext ec)
4407 throw new Exception ("Unimplemented");
4412 // This class exists solely to pass the Type around and to be a dummy
4413 // that can be passed to the conversion functions (this is used by
4414 // foreach implementation to typecast the object return value from
4415 // get_Current into the proper type. All code has been generated and
4416 // we only care about the side effect conversions to be performed
4419 public class EmptyExpression : Expression {
4420 public EmptyExpression ()
4422 type = TypeManager.object_type;
4423 eclass = ExprClass.Value;
4426 public override Expression DoResolve (TypeContainer tc)
4431 public override void Emit (EmitContext ec)
4433 // nothing, as we only exist to not do anything.
4437 public class UserCast : Expression {
4440 Type most_specific_source;
4441 Type most_specific_target;
4444 public UserCast (MethodInfo method, Expression source, Type most_specific_source,
4445 Type most_specific_target, bool is_explicit)
4447 this.method = method;
4448 this.source = source;
4449 this.most_specific_source = most_specific_source;
4450 this.most_specific_target = most_specific_target;
4451 this.is_explicit = is_explicit;
4452 type = method.ReturnType;
4453 eclass = ExprClass.Value;
4456 public override Expression DoResolve (TypeContainer tc)
4459 // We are born in a fully resolved state
4464 public override void Emit (EmitContext ec)
4466 ILGenerator ig = ec.ig;
4467 Location tmp = new Location (-1);
4469 // Note that operators are static anyway
4474 e = ConvertImplicitStandard (ec.parent, source, most_specific_source, tmp);
4476 e = ConvertExplicit (ec.parent, source, most_specific_source, tmp);
4480 if (method is MethodInfo)
4481 ig.Emit (OpCodes.Call, (MethodInfo) method);
4483 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
4486 // FIXME : Need to emit the right Opcode for conversion back to the
4487 // type expected by the actual expression. At this point, the type
4488 // of the value on the stack is obviously what the method returns
projects / mono.git / blob