2 // expression.cs: Expression representation for the IL tree.
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001 Ximian, Inc.
11 // Maybe we should make Resolve be an instance method that just calls
12 // the virtual DoResolve function and checks conditions like the eclass
13 // and type being set if a non-null value is returned. For robustness
19 using System.Collections;
20 using System.Diagnostics;
21 using System.Reflection;
22 using System.Reflection.Emit;
26 // The ExprClass class contains the is used to pass the
27 // classification of an expression (value, variable, namespace,
28 // type, method group, property access, event access, indexer access,
31 public enum ExprClass {
35 Variable, // Every Variable should implement LValue
46 // Base class for expressions
48 public abstract class Expression {
49 protected ExprClass eclass;
62 public ExprClass ExprClass {
73 // Utility wrapper routine for Error, just to beautify the code
75 static protected void Error (TypeContainer tc, int error, string s)
77 Report.Error (error, s);
80 static protected void Error (TypeContainer tc, int error, Location l, string s)
82 Report.Error (error, l, s);
86 // Utility wrapper routine for Warning, just to beautify the code
88 static protected void Warning (TypeContainer tc, int warning, string s)
90 Report.Warning (warning, s);
94 // Performs semantic analysis on the Expression
98 // The Resolve method is invoked to perform the semantic analysis
101 // The return value is an expression (it can be the
102 // same expression in some cases) or a new
103 // expression that better represents this node.
105 // For example, optimizations of Unary (LiteralInt)
106 // would return a new LiteralInt with a negated
109 // If there is an error during semantic analysis,
110 // then an error should
111 // be reported (using TypeContainer.RootContext.Report) and a null
112 // value should be returned.
114 // There are two side effects expected from calling
115 // Resolve(): the the field variable "eclass" should
116 // be set to any value of the enumeration
117 // `ExprClass' and the type variable should be set
118 // to a valid type (this is the type of the
122 public abstract Expression DoResolve (TypeContainer tc);
126 // Currently Resolve wraps DoResolve to perform sanity
127 // checking and assertion checking on what we expect from Resolve
130 public Expression Resolve (TypeContainer tc)
132 Expression e = DoResolve (tc);
135 if (e.ExprClass == ExprClass.Invalid)
136 throw new Exception ("Expression " + e +
137 " ExprClass is Invalid after resolve");
139 if (e.ExprClass != ExprClass.MethodGroup)
141 throw new Exception ("Expression " + e +
142 " did not set its type after Resolve");
149 // Emits the code for the expression
154 // The Emit method is invoked to generate the code
155 // for the expression.
158 public abstract void Emit (EmitContext ec);
161 // Protected constructor. Only derivate types should
162 // be able to be created
165 protected Expression ()
167 eclass = ExprClass.Invalid;
172 // Returns a literalized version of a literal FieldInfo
174 static Expression Literalize (FieldInfo fi)
176 Type t = fi.FieldType;
177 object v = fi.GetValue (fi);
179 if (t == TypeManager.int32_type)
180 return new IntLiteral ((int) v);
181 else if (t == TypeManager.uint32_type)
182 return new UIntLiteral ((uint) v);
183 else if (t == TypeManager.int64_type)
184 return new LongLiteral ((long) v);
185 else if (t == TypeManager.uint64_type)
186 return new ULongLiteral ((ulong) v);
187 else if (t == TypeManager.float_type)
188 return new FloatLiteral ((float) v);
189 else if (t == TypeManager.double_type)
190 return new DoubleLiteral ((double) v);
191 else if (t == TypeManager.string_type)
192 return new StringLiteral ((string) v);
193 else if (t == TypeManager.short_type)
194 return new IntLiteral ((int) ((short)v));
195 else if (t == TypeManager.ushort_type)
196 return new IntLiteral ((int) ((ushort)v));
197 else if (t == TypeManager.sbyte_type)
198 return new IntLiteral ((int) ((sbyte)v));
199 else if (t == TypeManager.byte_type)
200 return new IntLiteral ((int) ((byte)v));
201 else if (t == TypeManager.char_type)
202 return new IntLiteral ((int) ((char)v));
204 throw new Exception ("Unknown type for literal (" + v.GetType () +
205 "), details: " + fi);
209 // Returns a fully formed expression after a MemberLookup
211 static Expression ExprClassFromMemberInfo (TypeContainer tc, MemberInfo mi)
213 if (mi is EventInfo){
214 return new EventExpr ((EventInfo) mi);
215 } else if (mi is FieldInfo){
216 FieldInfo fi = (FieldInfo) mi;
219 Expression e = Literalize (fi);
224 return new FieldExpr (fi);
225 } else if (mi is PropertyInfo){
226 return new PropertyExpr ((PropertyInfo) mi);
227 } else if (mi is Type)
228 return new TypeExpr ((Type) mi);
234 // FIXME: Probably implement a cache for (t,name,current_access_set)?
236 // FIXME: We need to cope with access permissions here, or this wont
239 // This code could use some optimizations, but we need to do some
240 // measurements. For example, we could use a delegate to `flag' when
241 // something can not any longer be a method-group (because it is something
245 // If the return value is an Array, then it is an array of
248 // If the return value is an MemberInfo, it is anything, but a Method
252 // FIXME: When calling MemberLookup inside an `Invocation', we should pass
253 // the arguments here and have MemberLookup return only the methods that
254 // match the argument count/type, unlike we are doing now (we delay this
257 // This is so we can catch correctly attempts to invoke instance methods
258 // from a static body (scan for error 120 in ResolveSimpleName).
260 public static Expression MemberLookup (TypeContainer tc, Type t, string name,
261 bool same_type, MemberTypes mt, BindingFlags bf)
264 bf |= BindingFlags.NonPublic;
266 MemberInfo [] mi = tc.RootContext.TypeManager.FindMembers (
267 t, mt, bf, Type.FilterName, name);
272 // FIXME : How does this wierd case arise ?
276 if (mi.Length == 1 && !(mi [0] is MethodBase))
277 return Expression.ExprClassFromMemberInfo (tc, mi [0]);
279 for (int i = 0; i < mi.Length; i++)
280 if (!(mi [i] is MethodBase)){
282 -5, "Do not know how to reproduce this case: " +
283 "Methods and non-Method with the same name, " +
284 "report this please");
286 for (i = 0; i < mi.Length; i++){
287 Type tt = mi [i].GetType ();
289 Console.WriteLine (i + ": " + mi [i]);
290 while (tt != TypeManager.object_type){
291 Console.WriteLine (tt);
297 return new MethodGroupExpr (mi);
300 public const MemberTypes AllMemberTypes =
301 MemberTypes.Constructor |
305 MemberTypes.NestedType |
306 MemberTypes.Property;
308 public const BindingFlags AllBindingsFlags =
309 BindingFlags.Public |
310 BindingFlags.Static |
311 BindingFlags.Instance;
313 public static Expression MemberLookup (TypeContainer tc, Type t, string name,
316 return MemberLookup (tc, t, name, same_type, AllMemberTypes, AllBindingsFlags);
320 // I am in general unhappy with this implementation.
322 // I need to revise this.
324 static public Expression ResolveMemberAccess (TypeContainer tc, string name)
326 Expression left_e = null;
327 int dot_pos = name.LastIndexOf (".");
328 string left = name.Substring (0, dot_pos);
329 string right = name.Substring (dot_pos + 1);
332 if ((t = tc.LookupType (left, false)) != null){
335 left_e = new TypeExpr (t);
336 e = new MemberAccess (left_e, right);
337 return e.Resolve (tc);
343 // T.P Static property access (P) on Type T.
344 // e.P instance property access on instance e for P.
350 Error (tc, 246, "Can not find type or namespace `"+left+"'");
354 switch (left_e.ExprClass){
356 return MemberLookup (tc,
358 left_e.Type == tc.TypeBuilder);
360 case ExprClass.Namespace:
361 case ExprClass.PropertyAccess:
362 case ExprClass.IndexerAccess:
363 case ExprClass.Variable:
364 case ExprClass.Value:
365 case ExprClass.Nothing:
366 case ExprClass.EventAccess:
367 case ExprClass.MethodGroup:
368 case ExprClass.Invalid:
369 throw new Exception ("Should have got the " + left_e.ExprClass +
376 static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
378 Type expr_type = expr.Type;
380 if (target_type == TypeManager.object_type) {
381 if (expr_type.IsClass)
382 return new EmptyCast (expr, target_type);
383 if (expr_type.IsValueType)
384 return new BoxedCast (expr);
385 } else if (expr_type.IsSubclassOf (target_type)) {
386 return new EmptyCast (expr, target_type);
388 // from any class-type S to any interface-type T.
389 if (expr_type.IsClass && target_type.IsInterface) {
390 Type [] interfaces = expr_type.FindInterfaces (Module.FilterTypeName,
391 target_type.FullName);
392 if (interfaces != null)
393 return new EmptyCast (expr, target_type);
396 // from any interface type S to interface-type T.
397 // FIXME : Is it right to use IsAssignableFrom ?
398 if (expr_type.IsInterface && target_type.IsInterface)
399 if (target_type.IsAssignableFrom (expr_type))
400 return new EmptyCast (expr, target_type);
403 // from an array-type S to an array-type of type T
404 if (expr_type.IsArray && target_type.IsArray) {
406 throw new Exception ("Implement array conversion");
410 // from an array-type to System.Array
411 if (expr_type.IsArray && target_type.IsAssignableFrom (expr_type))
412 return new EmptyCast (expr, target_type);
414 // from any delegate type to System.Delegate
415 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
416 target_type == TypeManager.delegate_type)
417 if (target_type.IsAssignableFrom (expr_type))
418 return new EmptyCast (expr, target_type);
420 // from any array-type or delegate type into System.ICloneable.
421 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
422 if (target_type == TypeManager.cloneable_interface)
423 throw new Exception ("Implement conversion to System.ICloneable");
425 // from the null type to any reference-type.
426 // FIXME : How do we do this ?
436 // Handles expressions like this: decimal d; d = 1;
437 // and changes them into: decimal d; d = new System.Decimal (1);
439 static Expression InternalTypeConstructor (TypeContainer tc, Expression expr, Type target)
441 ArrayList args = new ArrayList ();
443 args.Add (new Argument (expr, Argument.AType.Expression));
445 Expression ne = new New (target.FullName, args,
448 return ne.Resolve (tc);
452 // Implicit Numeric Conversions.
454 // expr is the expression to convert, returns a new expression of type
455 // target_type or null if an implicit conversion is not possible.
458 static public Expression ImplicitNumericConversion (TypeContainer tc, Expression expr,
459 Type target_type, Location l)
461 Type expr_type = expr.Type;
464 // Attempt to do the implicit constant expression conversions
466 if (expr is IntLiteral){
469 e = TryImplicitIntConversion (target_type, (IntLiteral) expr);
472 } else if (expr is LongLiteral){
474 // Try the implicit constant expression conversion
475 // from long to ulong, instead of a nice routine,
478 if (((LongLiteral) expr).Value > 0)
479 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
482 if (expr_type == TypeManager.sbyte_type){
484 // From sbyte to short, int, long, float, double.
486 if (target_type == TypeManager.int32_type)
487 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
488 if (target_type == TypeManager.int64_type)
489 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
490 if (target_type == TypeManager.double_type)
491 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
492 if (target_type == TypeManager.float_type)
493 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
494 if (target_type == TypeManager.short_type)
495 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
496 if (target_type == TypeManager.decimal_type)
497 return InternalTypeConstructor (tc, expr, target_type);
498 } else if (expr_type == TypeManager.byte_type){
500 // From byte to short, ushort, int, uint, long, ulong, float, double
502 if ((target_type == TypeManager.short_type) ||
503 (target_type == TypeManager.ushort_type) ||
504 (target_type == TypeManager.int32_type) ||
505 (target_type == TypeManager.uint32_type))
506 return new EmptyCast (expr, target_type);
508 if (target_type == TypeManager.uint64_type)
509 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
510 if (target_type == TypeManager.int64_type)
511 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
513 if (target_type == TypeManager.float_type)
514 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
515 if (target_type == TypeManager.double_type)
516 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
517 if (target_type == TypeManager.decimal_type)
518 return InternalTypeConstructor (tc, expr, target_type);
519 } else if (expr_type == TypeManager.short_type){
521 // From short to int, long, float, double
523 if (target_type == TypeManager.int32_type)
524 return new EmptyCast (expr, target_type);
525 if (target_type == TypeManager.int64_type)
526 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
527 if (target_type == TypeManager.double_type)
528 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
529 if (target_type == TypeManager.float_type)
530 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
531 if (target_type == TypeManager.decimal_type)
532 return InternalTypeConstructor (tc, expr, target_type);
533 } else if (expr_type == TypeManager.ushort_type){
535 // From ushort to int, uint, long, ulong, float, double
537 if (target_type == TypeManager.uint32_type)
538 return new EmptyCast (expr, target_type);
540 if (target_type == TypeManager.uint64_type)
541 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
542 if (target_type == TypeManager.int32_type)
543 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
544 if (target_type == TypeManager.int64_type)
545 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
546 if (target_type == TypeManager.double_type)
547 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
548 if (target_type == TypeManager.float_type)
549 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
550 if (target_type == TypeManager.decimal_type)
551 return InternalTypeConstructor (tc, expr, target_type);
552 } else if (expr_type == TypeManager.int32_type){
554 // From int to long, float, double
556 if (target_type == TypeManager.int64_type)
557 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
558 if (target_type == TypeManager.double_type)
559 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
560 if (target_type == TypeManager.float_type)
561 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
562 if (target_type == TypeManager.decimal_type)
563 return InternalTypeConstructor (tc, expr, target_type);
564 } else if (expr_type == TypeManager.uint32_type){
566 // From uint to long, ulong, float, double
568 if (target_type == TypeManager.int64_type)
569 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
570 if (target_type == TypeManager.uint64_type)
571 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
572 if (target_type == TypeManager.double_type)
573 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
575 if (target_type == TypeManager.float_type)
576 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
578 if (target_type == TypeManager.decimal_type)
579 return InternalTypeConstructor (tc, expr, target_type);
580 } else if ((expr_type == TypeManager.uint64_type) ||
581 (expr_type == TypeManager.int64_type)){
583 // From long/ulong to float, double
585 if (target_type == TypeManager.double_type)
586 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
588 if (target_type == TypeManager.float_type)
589 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
591 if (target_type == TypeManager.decimal_type)
592 return InternalTypeConstructor (tc, expr, target_type);
593 } else if (expr_type == TypeManager.char_type){
595 // From char to ushort, int, uint, long, ulong, float, double
597 if ((target_type == TypeManager.ushort_type) ||
598 (target_type == TypeManager.int32_type) ||
599 (target_type == TypeManager.uint32_type))
600 return new EmptyCast (expr, target_type);
601 if (target_type == TypeManager.uint64_type)
602 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
603 if (target_type == TypeManager.int64_type)
604 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
605 if (target_type == TypeManager.float_type)
606 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
607 if (target_type == TypeManager.double_type)
608 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
609 if (target_type == TypeManager.decimal_type)
610 return InternalTypeConstructor (tc, expr, target_type);
611 } else if (expr_type == TypeManager.float_type){
615 if (target_type == TypeManager.double_type)
616 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
623 // Determines if a standard implicit conversion exists from
624 // expr_type to target_type
626 static bool StandardConversionExists (Type expr_type, Type target_type)
628 if (expr_type == target_type)
631 // First numeric conversions
633 if (expr_type == TypeManager.sbyte_type){
635 // From sbyte to short, int, long, float, double.
637 if ((target_type == TypeManager.int32_type) ||
638 (target_type == TypeManager.int64_type) ||
639 (target_type == TypeManager.double_type) ||
640 (target_type == TypeManager.float_type) ||
641 (target_type == TypeManager.short_type) ||
642 (target_type == TypeManager.decimal_type))
645 } else if (expr_type == TypeManager.byte_type){
647 // From byte to short, ushort, int, uint, long, ulong, float, double
649 if ((target_type == TypeManager.short_type) ||
650 (target_type == TypeManager.ushort_type) ||
651 (target_type == TypeManager.int32_type) ||
652 (target_type == TypeManager.uint32_type) ||
653 (target_type == TypeManager.uint64_type) ||
654 (target_type == TypeManager.int64_type) ||
655 (target_type == TypeManager.float_type) ||
656 (target_type == TypeManager.double_type) ||
657 (target_type == TypeManager.decimal_type))
660 } else if (expr_type == TypeManager.short_type){
662 // From short to int, long, float, double
664 if ((target_type == TypeManager.int32_type) ||
665 (target_type == TypeManager.int64_type) ||
666 (target_type == TypeManager.double_type) ||
667 (target_type == TypeManager.float_type) ||
668 (target_type == TypeManager.decimal_type))
671 } else if (expr_type == TypeManager.ushort_type){
673 // From ushort to int, uint, long, ulong, float, double
675 if ((target_type == TypeManager.uint32_type) ||
676 (target_type == TypeManager.uint64_type) ||
677 (target_type == TypeManager.int32_type) ||
678 (target_type == TypeManager.int64_type) ||
679 (target_type == TypeManager.double_type) ||
680 (target_type == TypeManager.float_type) ||
681 (target_type == TypeManager.decimal_type))
684 } else if (expr_type == TypeManager.int32_type){
686 // From int to long, float, double
688 if ((target_type == TypeManager.int64_type) ||
689 (target_type == TypeManager.double_type) ||
690 (target_type == TypeManager.float_type) ||
691 (target_type == TypeManager.decimal_type))
694 } else if (expr_type == TypeManager.uint32_type){
696 // From uint to long, ulong, float, double
698 if ((target_type == TypeManager.int64_type) ||
699 (target_type == TypeManager.uint64_type) ||
700 (target_type == TypeManager.double_type) ||
701 (target_type == TypeManager.float_type) ||
702 (target_type == TypeManager.decimal_type))
705 } else if ((expr_type == TypeManager.uint64_type) ||
706 (expr_type == TypeManager.int64_type)) {
708 // From long/ulong to float, double
710 if ((target_type == TypeManager.double_type) ||
711 (target_type == TypeManager.float_type) ||
712 (target_type == TypeManager.decimal_type))
715 } else if (expr_type == TypeManager.char_type){
717 // From char to ushort, int, uint, long, ulong, float, double
719 if ((target_type == TypeManager.ushort_type) ||
720 (target_type == TypeManager.int32_type) ||
721 (target_type == TypeManager.uint32_type) ||
722 (target_type == TypeManager.uint64_type) ||
723 (target_type == TypeManager.int64_type) ||
724 (target_type == TypeManager.float_type) ||
725 (target_type == TypeManager.double_type) ||
726 (target_type == TypeManager.decimal_type))
729 } else if (expr_type == TypeManager.float_type){
733 if (target_type == TypeManager.double_type)
737 // Next reference conversions
739 if (target_type == TypeManager.object_type) {
740 if ((expr_type.IsClass) ||
741 (expr_type.IsValueType))
744 } else if (expr_type.IsSubclassOf (target_type)) {
748 // from any class-type S to any interface-type T.
749 if (expr_type.IsClass && target_type.IsInterface)
752 // from any interface type S to interface-type T.
753 // FIXME : Is it right to use IsAssignableFrom ?
754 if (expr_type.IsInterface && target_type.IsInterface)
755 if (target_type.IsAssignableFrom (expr_type))
758 // from an array-type S to an array-type of type T
759 if (expr_type.IsArray && target_type.IsArray)
762 // from an array-type to System.Array
763 if (expr_type.IsArray && target_type.IsAssignableFrom (expr_type))
766 // from any delegate type to System.Delegate
767 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
768 target_type == TypeManager.delegate_type)
769 if (target_type.IsAssignableFrom (expr_type))
772 // from any array-type or delegate type into System.ICloneable.
773 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
774 if (target_type == TypeManager.cloneable_interface)
777 // from the null type to any reference-type.
778 // FIXME : How do we do this ?
786 // Finds "most encompassed type" according to the spec (13.4.2)
787 // amongst the methods in the MethodGroupExpr which convert from a
788 // type encompassing source_type
790 static Type FindMostEncompassedType (TypeContainer tc, MethodGroupExpr me, Type source_type)
794 for (int i = me.Methods.Length; i > 0; ) {
797 MethodBase mb = me.Methods [i];
798 ParameterData pd = Invocation.GetParameterData (mb);
799 Type param_type = pd.ParameterType (0);
801 if (StandardConversionExists (source_type, param_type)) {
805 if (StandardConversionExists (param_type, best))
814 // Finds "most encompassing type" according to the spec (13.4.2)
815 // amongst the methods in the MethodGroupExpr which convert to a
816 // type encompassed by target_type
818 static Type FindMostEncompassingType (TypeContainer tc, MethodGroupExpr me, Type target)
822 for (int i = me.Methods.Length; i > 0; ) {
825 MethodInfo mi = (MethodInfo) me.Methods [i];
826 Type ret_type = mi.ReturnType;
828 if (StandardConversionExists (target, ret_type)) {
832 if (!StandardConversionExists (ret_type, best))
844 // User-defined implicit conversions
846 static public Expression ImplicitUserConversion (TypeContainer tc, Expression source,
847 Type target, Location l)
849 Expression mg1 = null, mg2 = null, mg3 = null, mg4 = null;
850 MethodBase method = null;
851 Type source_type = source.Type;
855 // If we have a boolean type, we need to check for the True operator
857 // FIXME : How does the False operator come into the picture ?
858 // FIXME : This doesn't look complete and very correct !
859 if (target == TypeManager.bool_type)
862 op_name = "op_Implicit";
864 mg1 = MemberLookup (tc, source_type, op_name, false);
866 if (source_type.BaseType != null)
867 mg2 = MemberLookup (tc, source_type.BaseType, op_name, false);
869 mg3 = MemberLookup (tc, target, op_name, false);
871 if (target.BaseType != null)
872 mg4 = MemberLookup (tc, target.BaseType, op_name, false);
874 MethodGroupExpr union1 = Invocation.MakeUnionSet (mg1, mg2);
875 MethodGroupExpr union2 = Invocation.MakeUnionSet (mg3, mg4);
877 MethodGroupExpr union = Invocation.MakeUnionSet (union1, union2);
881 Type most_specific_source, most_specific_target;
883 most_specific_source = FindMostEncompassedType (tc, union, source_type);
885 if (most_specific_source == null)
889 most_specific_target = FindMostEncompassingType (tc, union, target);
891 if (most_specific_target == null)
897 for (int i = union.Methods.Length; i > 0;) {
900 MethodBase mb = union.Methods [i];
901 ParameterData pd = Invocation.GetParameterData (mb);
902 MethodInfo mi = (MethodInfo) union.Methods [i];
904 if (pd.ParameterType (0) == most_specific_source &&
905 mi.ReturnType == most_specific_target) {
911 if (method == null || count > 1)
915 return new UserImplicitCast ((MethodInfo) method, source, most_specific_source,
916 most_specific_target);
924 // Converts implicitly the resolved expression `expr' into the
925 // `target_type'. It returns a new expression that can be used
926 // in a context that expects a `target_type'.
928 static public Expression ConvertImplicit (TypeContainer tc, Expression expr,
929 Type target_type, Location l)
931 Type expr_type = expr.Type;
934 if (expr_type == target_type)
937 e = ImplicitNumericConversion (tc, expr, target_type, l);
941 e = ImplicitReferenceConversion (expr, target_type);
945 e = ImplicitUserConversion (tc, expr, target_type, l);
949 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
950 IntLiteral i = (IntLiteral) expr;
953 return new EmptyCast (expr, target_type);
961 // Attempts to apply the `Standard Implicit
962 // Conversion' rules to the expression `expr' into
963 // the `target_type'. It returns a new expression
964 // that can be used in a context that expects a
967 // This is different from `ConvertImplicit' in that the
968 // user defined implicit conversions are excluded.
970 static public Expression ConvertImplicitStandard (TypeContainer tc, Expression expr,
971 Type target_type, Location l)
973 Type expr_type = expr.Type;
976 if (expr_type == target_type)
979 e = ImplicitNumericConversion (tc, expr, target_type, l);
983 e = ImplicitReferenceConversion (expr, target_type);
987 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
988 IntLiteral i = (IntLiteral) expr;
991 return new EmptyCast (expr, target_type);
996 // Attemps to perform an implict constant conversion of the IntLiteral
997 // into a different data type using casts (See Implicit Constant
998 // Expression Conversions)
1000 static protected Expression TryImplicitIntConversion (Type target_type, IntLiteral il)
1002 int value = il.Value;
1004 if (target_type == TypeManager.sbyte_type){
1005 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1007 } else if (target_type == TypeManager.byte_type){
1008 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1010 } else if (target_type == TypeManager.short_type){
1011 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1013 } else if (target_type == TypeManager.ushort_type){
1014 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1016 } else if (target_type == TypeManager.uint32_type){
1018 // we can optimize this case: a positive int32
1019 // always fits on a uint32
1023 } else if (target_type == TypeManager.uint64_type){
1025 // we can optimize this case: a positive int32
1026 // always fits on a uint64. But we need an opcode
1030 return new OpcodeCast (il, target_type, OpCodes.Conv_I8);
1037 // Attemptes to implicityly convert `target' into `type', using
1038 // ConvertImplicit. If there is no implicit conversion, then
1039 // an error is signaled
1041 static public Expression ConvertImplicitRequired (TypeContainer tc, Expression target,
1042 Type type, Location l)
1046 e = ConvertImplicit (tc, target, type, l);
1050 string msg = "Can not convert implicitly from `"+
1051 TypeManager.CSharpName (target.Type) + "' to `" +
1052 TypeManager.CSharpName (type) + "'";
1054 Error (tc, 29, l, msg);
1060 // Performs the explicit numeric conversions
1062 static Expression ConvertNumericExplicit (TypeContainer tc, Expression expr,
1065 Type expr_type = expr.Type;
1067 if (expr_type == TypeManager.sbyte_type){
1069 // From sbyte to byte, ushort, uint, ulong, char
1071 if (target_type == TypeManager.byte_type)
1072 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1073 if (target_type == TypeManager.ushort_type)
1074 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1075 if (target_type == TypeManager.uint32_type)
1076 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1077 if (target_type == TypeManager.uint64_type)
1078 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1079 if (target_type == TypeManager.char_type)
1080 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1081 } else if (expr_type == TypeManager.byte_type){
1083 // From byte to sbyte and char
1085 if (target_type == TypeManager.sbyte_type)
1086 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1087 if (target_type == TypeManager.char_type)
1088 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1089 } else if (expr_type == TypeManager.short_type){
1091 // From short to sbyte, byte, ushort, uint, ulong, char
1093 if (target_type == TypeManager.sbyte_type)
1094 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1095 if (target_type == TypeManager.byte_type)
1096 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1097 if (target_type == TypeManager.ushort_type)
1098 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1099 if (target_type == TypeManager.uint32_type)
1100 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1101 if (target_type == TypeManager.uint64_type)
1102 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1103 if (target_type == TypeManager.char_type)
1104 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1105 } else if (expr_type == TypeManager.ushort_type){
1107 // From ushort to sbyte, byte, short, char
1109 if (target_type == TypeManager.sbyte_type)
1110 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1111 if (target_type == TypeManager.byte_type)
1112 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1113 if (target_type == TypeManager.short_type)
1114 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1115 if (target_type == TypeManager.char_type)
1116 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1117 } else if (expr_type == TypeManager.int32_type){
1119 // From int to sbyte, byte, short, ushort, uint, ulong, char
1121 if (target_type == TypeManager.sbyte_type)
1122 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1123 if (target_type == TypeManager.byte_type)
1124 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1125 if (target_type == TypeManager.short_type)
1126 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1127 if (target_type == TypeManager.ushort_type)
1128 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1129 if (target_type == TypeManager.uint32_type)
1130 return new EmptyCast (expr, target_type);
1131 if (target_type == TypeManager.uint64_type)
1132 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1133 if (target_type == TypeManager.char_type)
1134 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1135 } else if (expr_type == TypeManager.uint32_type){
1137 // From uint to sbyte, byte, short, ushort, int, char
1139 if (target_type == TypeManager.sbyte_type)
1140 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1141 if (target_type == TypeManager.byte_type)
1142 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1143 if (target_type == TypeManager.short_type)
1144 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1145 if (target_type == TypeManager.ushort_type)
1146 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1147 if (target_type == TypeManager.int32_type)
1148 return new EmptyCast (expr, target_type);
1149 if (target_type == TypeManager.char_type)
1150 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1151 } else if (expr_type == TypeManager.int64_type){
1153 // From long to sbyte, byte, short, ushort, int, uint, ulong, char
1155 if (target_type == TypeManager.sbyte_type)
1156 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1157 if (target_type == TypeManager.byte_type)
1158 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1159 if (target_type == TypeManager.short_type)
1160 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1161 if (target_type == TypeManager.ushort_type)
1162 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1163 if (target_type == TypeManager.int32_type)
1164 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1165 if (target_type == TypeManager.uint32_type)
1166 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1167 if (target_type == TypeManager.uint64_type)
1168 return new EmptyCast (expr, target_type);
1169 if (target_type == TypeManager.char_type)
1170 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1171 } else if (expr_type == TypeManager.uint64_type){
1173 // From ulong to sbyte, byte, short, ushort, int, uint, long, char
1175 if (target_type == TypeManager.sbyte_type)
1176 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1177 if (target_type == TypeManager.byte_type)
1178 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1179 if (target_type == TypeManager.short_type)
1180 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1181 if (target_type == TypeManager.ushort_type)
1182 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1183 if (target_type == TypeManager.int32_type)
1184 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1185 if (target_type == TypeManager.uint32_type)
1186 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1187 if (target_type == TypeManager.int64_type)
1188 return new EmptyCast (expr, target_type);
1189 if (target_type == TypeManager.char_type)
1190 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1191 } else if (expr_type == TypeManager.char_type){
1193 // From char to sbyte, byte, short
1195 if (target_type == TypeManager.sbyte_type)
1196 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1197 if (target_type == TypeManager.byte_type)
1198 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1199 if (target_type == TypeManager.short_type)
1200 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1201 } else if (expr_type == TypeManager.float_type){
1203 // From float to sbyte, byte, short,
1204 // ushort, int, uint, long, 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.int64_type)
1220 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1221 if (target_type == TypeManager.uint64_type)
1222 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1223 if (target_type == TypeManager.char_type)
1224 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1225 if (target_type == TypeManager.decimal_type)
1226 return InternalTypeConstructor (tc, expr, target_type);
1227 } else if (expr_type == TypeManager.double_type){
1229 // From double to byte, byte, short,
1230 // ushort, int, uint, long, ulong,
1231 // char, float or decimal
1233 if (target_type == TypeManager.sbyte_type)
1234 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1235 if (target_type == TypeManager.byte_type)
1236 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1237 if (target_type == TypeManager.short_type)
1238 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1239 if (target_type == TypeManager.ushort_type)
1240 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1241 if (target_type == TypeManager.int32_type)
1242 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1243 if (target_type == TypeManager.uint32_type)
1244 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1245 if (target_type == TypeManager.int64_type)
1246 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1247 if (target_type == TypeManager.uint64_type)
1248 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1249 if (target_type == TypeManager.char_type)
1250 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1251 if (target_type == TypeManager.float_type)
1252 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
1253 if (target_type == TypeManager.decimal_type)
1254 return InternalTypeConstructor (tc, expr, target_type);
1257 // decimal is taken care of by the op_Explicit methods.
1263 // Implements Explicit Reference conversions
1265 static Expression ConvertReferenceExplicit (TypeContainer tc, Expression expr,
1268 Type expr_type = expr.Type;
1269 bool target_is_value_type = target_type.IsValueType;
1272 // From object to any reference type
1274 if (expr_type == TypeManager.object_type && !target_is_value_type)
1275 return new ClassCast (expr, expr_type);
1281 // Performs an explicit conversion of the expression `expr' whose
1282 // type is expr.Type to `target_type'.
1284 static public Expression ConvertExplicit (TypeContainer tc, Expression expr,
1287 Expression ne = ConvertImplicit (tc, expr, target_type, Location.Null);
1292 ne = ConvertNumericExplicit (tc, expr, target_type);
1296 ne = ConvertReferenceExplicit (tc, expr, target_type);
1303 static string ExprClassName (ExprClass c)
1306 case ExprClass.Invalid:
1308 case ExprClass.Value:
1310 case ExprClass.Variable:
1312 case ExprClass.Namespace:
1314 case ExprClass.Type:
1316 case ExprClass.MethodGroup:
1317 return "method group";
1318 case ExprClass.PropertyAccess:
1319 return "property access";
1320 case ExprClass.EventAccess:
1321 return "event access";
1322 case ExprClass.IndexerAccess:
1323 return "indexer access";
1324 case ExprClass.Nothing:
1327 throw new Exception ("Should not happen");
1331 // Reports that we were expecting `expr' to be of class `expected'
1333 protected void report118 (TypeContainer tc, Location l, Expression expr, string expected)
1335 string kind = "Unknown";
1338 kind = ExprClassName (expr.ExprClass);
1340 Error (tc, 118, l, "Expression denotes a '" + kind +
1341 "' where an " + expected + " was expected");
1346 // This is just a base class for expressions that can
1347 // appear on statements (invocations, object creation,
1348 // assignments, post/pre increment and decrement). The idea
1349 // being that they would support an extra Emition interface that
1350 // does not leave a result on the stack.
1353 public abstract class ExpressionStatement : Expression {
1356 // Requests the expression to be emitted in a `statement'
1357 // context. This means that no new value is left on the
1358 // stack after invoking this method (constrasted with
1359 // Emit that will always leave a value on the stack).
1361 public abstract void EmitStatement (EmitContext ec);
1365 // This kind of cast is used to encapsulate the child
1366 // whose type is child.Type into an expression that is
1367 // reported to return "return_type". This is used to encapsulate
1368 // expressions which have compatible types, but need to be dealt
1369 // at higher levels with.
1371 // For example, a "byte" expression could be encapsulated in one
1372 // of these as an "unsigned int". The type for the expression
1373 // would be "unsigned int".
1377 public class EmptyCast : Expression {
1378 protected Expression child;
1380 public EmptyCast (Expression child, Type return_type)
1382 ExprClass = child.ExprClass;
1387 public override Expression DoResolve (TypeContainer tc)
1389 // This should never be invoked, we are born in fully
1390 // initialized state.
1395 public override void Emit (EmitContext ec)
1402 // This kind of cast is used to encapsulate Value Types in objects.
1404 // The effect of it is to box the value type emitted by the previous
1407 public class BoxedCast : EmptyCast {
1409 public BoxedCast (Expression expr)
1410 : base (expr, TypeManager.object_type)
1414 public override Expression DoResolve (TypeContainer tc)
1416 // This should never be invoked, we are born in fully
1417 // initialized state.
1422 public override void Emit (EmitContext ec)
1425 ec.ig.Emit (OpCodes.Box, child.Type);
1430 // This kind of cast is used to encapsulate a child expression
1431 // that can be trivially converted to a target type using one or
1432 // two opcodes. The opcodes are passed as arguments.
1434 public class OpcodeCast : EmptyCast {
1438 public OpcodeCast (Expression child, Type return_type, OpCode op)
1439 : base (child, return_type)
1443 second_valid = false;
1446 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
1447 : base (child, return_type)
1452 second_valid = true;
1455 public override Expression DoResolve (TypeContainer tc)
1457 // This should never be invoked, we are born in fully
1458 // initialized state.
1463 public override void Emit (EmitContext ec)
1475 // This kind of cast is used to encapsulate a child and cast it
1476 // to the class requested
1478 public class ClassCast : EmptyCast {
1479 public ClassCast (Expression child, Type return_type)
1480 : base (child, return_type)
1485 public override Expression DoResolve (TypeContainer tc)
1487 // This should never be invoked, we are born in fully
1488 // initialized state.
1493 public override void Emit (EmitContext ec)
1497 ec.ig.Emit (OpCodes.Castclass, type);
1503 // Unary expressions.
1507 // Unary implements unary expressions. It derives from
1508 // ExpressionStatement becuase the pre/post increment/decrement
1509 // operators can be used in a statement context.
1511 public class Unary : ExpressionStatement {
1512 public enum Operator {
1513 Addition, Subtraction, Negate, BitComplement,
1514 Indirection, AddressOf, PreIncrement,
1515 PreDecrement, PostIncrement, PostDecrement
1520 ArrayList Arguments;
1524 public Unary (Operator op, Expression expr, Location loc)
1528 this.location = loc;
1531 public Expression Expr {
1541 public Operator Oper {
1552 // Returns a stringified representation of the Operator
1557 case Operator.Addition:
1559 case Operator.Subtraction:
1561 case Operator.Negate:
1563 case Operator.BitComplement:
1565 case Operator.AddressOf:
1567 case Operator.Indirection:
1569 case Operator.PreIncrement : case Operator.PostIncrement :
1571 case Operator.PreDecrement : case Operator.PostDecrement :
1575 return oper.ToString ();
1578 Expression ForceConversion (TypeContainer tc, Expression expr, Type target_type)
1580 if (expr.Type == target_type)
1583 return ConvertImplicit (tc, expr, target_type, new Location (-1));
1586 void error23 (TypeContainer tc, Type t)
1588 Report.Error (23, location, "Operator " + OperName () +
1589 " cannot be applied to operand of type `" +
1590 TypeManager.CSharpName (t) + "'");
1594 // Returns whether an object of type `t' can be incremented
1595 // or decremented with add/sub (ie, basically whether we can
1596 // use pre-post incr-decr operations on it, but it is not a
1597 // System.Decimal, which we test elsewhere)
1599 static bool IsIncrementableNumber (Type t)
1601 return (t == TypeManager.sbyte_type) ||
1602 (t == TypeManager.byte_type) ||
1603 (t == TypeManager.short_type) ||
1604 (t == TypeManager.ushort_type) ||
1605 (t == TypeManager.int32_type) ||
1606 (t == TypeManager.uint32_type) ||
1607 (t == TypeManager.int64_type) ||
1608 (t == TypeManager.uint64_type) ||
1609 (t == TypeManager.char_type) ||
1610 (t.IsSubclassOf (TypeManager.enum_type)) ||
1611 (t == TypeManager.float_type) ||
1612 (t == TypeManager.double_type);
1615 Expression ResolveOperator (TypeContainer tc)
1617 Type expr_type = expr.Type;
1620 // Step 1: Perform Operator Overload location
1625 if (oper == Operator.PostIncrement || oper == Operator.PreIncrement)
1626 op_name = "op_Increment";
1627 else if (oper == Operator.PostDecrement || oper == Operator.PreDecrement)
1628 op_name = "op_Decrement";
1630 op_name = "op_" + oper;
1632 mg = MemberLookup (tc, expr_type, op_name, false);
1634 if (mg == null && expr_type.BaseType != null)
1635 mg = MemberLookup (tc, expr_type.BaseType, op_name, false);
1638 Arguments = new ArrayList ();
1639 Arguments.Add (new Argument (expr, Argument.AType.Expression));
1641 method = Invocation.OverloadResolve (tc, (MethodGroupExpr) mg,
1642 Arguments, location);
1643 if (method != null) {
1644 MethodInfo mi = (MethodInfo) method;
1645 type = mi.ReturnType;
1648 error23 (tc, expr_type);
1655 // Step 2: Default operations on CLI native types.
1658 // Only perform numeric promotions on:
1661 if (expr_type == null)
1664 if (oper == Operator.Negate){
1665 if (expr_type != TypeManager.bool_type) {
1666 error23 (tc, expr.Type);
1670 type = TypeManager.bool_type;
1674 if (oper == Operator.BitComplement) {
1675 if (!((expr_type == TypeManager.int32_type) ||
1676 (expr_type == TypeManager.uint32_type) ||
1677 (expr_type == TypeManager.int64_type) ||
1678 (expr_type == TypeManager.uint64_type) ||
1679 (expr_type.IsSubclassOf (TypeManager.enum_type)))){
1680 error23 (tc, expr.Type);
1687 if (oper == Operator.Addition) {
1689 // A plus in front of something is just a no-op, so return the child.
1695 // Deals with -literals
1696 // int operator- (int x)
1697 // long operator- (long x)
1698 // float operator- (float f)
1699 // double operator- (double d)
1700 // decimal operator- (decimal d)
1702 if (oper == Operator.Subtraction){
1704 // Fold a "- Constant" into a negative constant
1707 Expression e = null;
1710 // Is this a constant?
1712 if (expr is IntLiteral)
1713 e = new IntLiteral (-((IntLiteral) expr).Value);
1714 else if (expr is LongLiteral)
1715 e = new LongLiteral (-((LongLiteral) expr).Value);
1716 else if (expr is FloatLiteral)
1717 e = new FloatLiteral (-((FloatLiteral) expr).Value);
1718 else if (expr is DoubleLiteral)
1719 e = new DoubleLiteral (-((DoubleLiteral) expr).Value);
1720 else if (expr is DecimalLiteral)
1721 e = new DecimalLiteral (-((DecimalLiteral) expr).Value);
1729 // Not a constant we can optimize, perform numeric
1730 // promotions to int, long, double.
1733 // The following is inneficient, because we call
1734 // ConvertImplicit too many times.
1736 // It is also not clear if we should convert to Float
1737 // or Double initially.
1739 Location l = new Location (-1);
1741 if (expr_type == TypeManager.uint32_type){
1743 // FIXME: handle exception to this rule that
1744 // permits the int value -2147483648 (-2^31) to
1745 // bt written as a decimal interger literal
1747 type = TypeManager.int64_type;
1748 expr = ConvertImplicit (tc, expr, type, l);
1752 if (expr_type == TypeManager.uint64_type){
1754 // FIXME: Handle exception of `long value'
1755 // -92233720368547758087 (-2^63) to be written as
1756 // decimal integer literal.
1758 error23 (tc, expr_type);
1762 e = ConvertImplicit (tc, expr, TypeManager.int32_type, l);
1769 e = ConvertImplicit (tc, expr, TypeManager.int64_type, l);
1776 e = ConvertImplicit (tc, expr, TypeManager.double_type, l);
1783 error23 (tc, expr_type);
1788 // The operand of the prefix/postfix increment decrement operators
1789 // should be an expression that is classified as a variable,
1790 // a property access or an indexer access
1792 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
1793 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
1794 if (expr.ExprClass == ExprClass.Variable){
1795 if (IsIncrementableNumber (expr_type) ||
1796 expr_type == TypeManager.decimal_type){
1800 } else if (expr.ExprClass == ExprClass.IndexerAccess){
1802 // FIXME: Verify that we have both get and set methods
1804 throw new Exception ("Implement me");
1805 } else if (expr.ExprClass == ExprClass.PropertyAccess){
1807 // FIXME: Verify that we have both get and set methods
1809 throw new Exception ("Implement me");
1811 report118 (tc, location, expr,
1812 "variable, indexer or property access");
1816 if (oper == Operator.AddressOf){
1817 if (expr.ExprClass != ExprClass.Variable){
1818 Error (tc, 211, "Cannot take the address of non-variables");
1821 type = Type.GetType (expr.Type.ToString () + "*");
1824 Error (tc, 187, "No such operator '" + OperName () + "' defined for type '" +
1825 TypeManager.CSharpName (expr_type) + "'");
1830 public override Expression DoResolve (TypeContainer tc)
1832 expr = expr.Resolve (tc);
1837 eclass = ExprClass.Value;
1838 return ResolveOperator (tc);
1841 public override void Emit (EmitContext ec)
1843 ILGenerator ig = ec.ig;
1844 Type expr_type = expr.Type;
1846 if (method != null) {
1848 // Note that operators are static anyway
1850 if (Arguments != null)
1851 Invocation.EmitArguments (ec, method, Arguments);
1854 // Post increment/decrement operations need a copy at this
1857 if (oper == Operator.PostDecrement || oper == Operator.PostIncrement)
1858 ig.Emit (OpCodes.Dup);
1861 ig.Emit (OpCodes.Call, (MethodInfo) method);
1864 // Pre Increment and Decrement operators
1866 if (oper == Operator.PreIncrement || oper == Operator.PreDecrement){
1867 ig.Emit (OpCodes.Dup);
1871 // Increment and Decrement should store the result
1873 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
1874 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
1875 ((LValue) expr).Store (ec);
1881 case Operator.Addition:
1882 throw new Exception ("This should be caught by Resolve");
1884 case Operator.Subtraction:
1886 ig.Emit (OpCodes.Neg);
1889 case Operator.Negate:
1891 ig.Emit (OpCodes.Ldc_I4_0);
1892 ig.Emit (OpCodes.Ceq);
1895 case Operator.BitComplement:
1897 ig.Emit (OpCodes.Not);
1900 case Operator.AddressOf:
1901 ((LValue)expr).AddressOf (ec);
1904 case Operator.Indirection:
1905 throw new Exception ("Not implemented yet");
1907 case Operator.PreIncrement:
1908 case Operator.PreDecrement:
1909 if (expr.ExprClass == ExprClass.Variable){
1911 // Resolve already verified that it is an "incrementable"
1914 ig.Emit (OpCodes.Ldc_I4_1);
1916 if (oper == Operator.PreDecrement)
1917 ig.Emit (OpCodes.Sub);
1919 ig.Emit (OpCodes.Add);
1920 ig.Emit (OpCodes.Dup);
1921 ((LValue) expr).Store (ec);
1923 throw new Exception ("Handle Indexers and Properties here");
1927 case Operator.PostIncrement:
1928 case Operator.PostDecrement:
1929 if (expr.ExprClass == ExprClass.Variable){
1931 // Resolve already verified that it is an "incrementable"
1934 ig.Emit (OpCodes.Dup);
1935 ig.Emit (OpCodes.Ldc_I4_1);
1937 if (oper == Operator.PostDecrement)
1938 ig.Emit (OpCodes.Sub);
1940 ig.Emit (OpCodes.Add);
1941 ((LValue) expr).Store (ec);
1943 throw new Exception ("Handle Indexers and Properties here");
1948 throw new Exception ("This should not happen: Operator = "
1949 + oper.ToString ());
1954 public override void EmitStatement (EmitContext ec)
1957 // FIXME: we should rewrite this code to generate
1958 // better code for ++ and -- as we know we wont need
1959 // the values on the stack
1962 ec.ig.Emit (OpCodes.Pop);
1966 public class Probe : Expression {
1967 public readonly string ProbeType;
1968 public readonly Operator Oper;
1972 public enum Operator {
1976 public Probe (Operator oper, Expression expr, string probe_type)
1979 ProbeType = probe_type;
1983 public Expression Expr {
1989 public override Expression DoResolve (TypeContainer tc)
1991 probe_type = tc.LookupType (ProbeType, false);
1993 if (probe_type == null)
1996 expr = expr.Resolve (tc);
1998 type = TypeManager.bool_type;
1999 eclass = ExprClass.Value;
2004 public override void Emit (EmitContext ec)
2006 ILGenerator ig = ec.ig;
2010 if (Oper == Operator.Is){
2011 ig.Emit (OpCodes.Isinst, probe_type);
2012 ig.Emit (OpCodes.Ldnull);
2013 ig.Emit (OpCodes.Cgt_Un);
2015 ig.Emit (OpCodes.Isinst, probe_type);
2021 // This represents a typecast in the source language.
2023 // FIXME: Cast expressions have an unusual set of parsing
2024 // rules, we need to figure those out.
2026 public class Cast : Expression {
2030 public Cast (string cast_type, Expression expr)
2032 this.target_type = cast_type;
2036 public string TargetType {
2042 public Expression Expr {
2051 public override Expression DoResolve (TypeContainer tc)
2053 expr = expr.Resolve (tc);
2057 type = tc.LookupType (target_type, false);
2058 eclass = ExprClass.Value;
2063 expr = ConvertExplicit (tc, expr, type);
2068 public override void Emit (EmitContext ec)
2071 // This one will never happen
2073 throw new Exception ("Should not happen");
2077 public class Binary : Expression {
2078 public enum Operator {
2079 Multiply, Division, Modulus,
2080 Addition, Subtraction,
2081 LeftShift, RightShift,
2082 LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
2083 Equality, Inequality,
2092 Expression left, right;
2094 ArrayList Arguments;
2098 public Binary (Operator oper, Expression left, Expression right, Location loc)
2103 this.location = loc;
2106 public Operator Oper {
2115 public Expression Left {
2124 public Expression Right {
2135 // Returns a stringified representation of the Operator
2140 case Operator.Multiply:
2142 case Operator.Division:
2144 case Operator.Modulus:
2146 case Operator.Addition:
2148 case Operator.Subtraction:
2150 case Operator.LeftShift:
2152 case Operator.RightShift:
2154 case Operator.LessThan:
2156 case Operator.GreaterThan:
2158 case Operator.LessThanOrEqual:
2160 case Operator.GreaterThanOrEqual:
2162 case Operator.Equality:
2164 case Operator.Inequality:
2166 case Operator.BitwiseAnd:
2168 case Operator.BitwiseOr:
2170 case Operator.ExclusiveOr:
2172 case Operator.LogicalOr:
2174 case Operator.LogicalAnd:
2178 return oper.ToString ();
2181 Expression ForceConversion (TypeContainer tc, Expression expr, Type target_type)
2183 if (expr.Type == target_type)
2186 return ConvertImplicit (tc, expr, target_type, new Location (-1));
2190 // Note that handling the case l == Decimal || r == Decimal
2191 // is taken care of by the Step 1 Operator Overload resolution.
2193 void DoNumericPromotions (TypeContainer tc, Type l, Type r)
2195 if (l == TypeManager.double_type || r == TypeManager.double_type){
2197 // If either operand is of type double, the other operand is
2198 // conveted to type double.
2200 if (r != TypeManager.double_type)
2201 right = ConvertImplicit (tc, right, TypeManager.double_type, location);
2202 if (l != TypeManager.double_type)
2203 left = ConvertImplicit (tc, left, TypeManager.double_type, location);
2205 type = TypeManager.double_type;
2206 } else if (l == TypeManager.float_type || r == TypeManager.float_type){
2208 // if either operand is of type float, th eother operand is
2209 // converd to type float.
2211 if (r != TypeManager.double_type)
2212 right = ConvertImplicit (tc, right, TypeManager.float_type, location);
2213 if (l != TypeManager.double_type)
2214 left = ConvertImplicit (tc, left, TypeManager.float_type, location);
2215 type = TypeManager.float_type;
2216 } else if (l == TypeManager.uint64_type || r == TypeManager.uint64_type){
2220 // If either operand is of type ulong, the other operand is
2221 // converted to type ulong. or an error ocurrs if the other
2222 // operand is of type sbyte, short, int or long
2225 if (l == TypeManager.uint64_type){
2226 if (r != TypeManager.uint64_type && right is IntLiteral){
2227 e = TryImplicitIntConversion (l, (IntLiteral) right);
2233 if (left is IntLiteral){
2234 e = TryImplicitIntConversion (r, (IntLiteral) left);
2241 if ((other == TypeManager.sbyte_type) ||
2242 (other == TypeManager.short_type) ||
2243 (other == TypeManager.int32_type) ||
2244 (other == TypeManager.int64_type)){
2245 string oper = OperName ();
2247 Error (tc, 34, location, "Operator `" + OperName ()
2248 + "' is ambiguous on operands of type `"
2249 + TypeManager.CSharpName (l) + "' "
2250 + "and `" + TypeManager.CSharpName (r)
2253 type = TypeManager.uint64_type;
2254 } else if (l == TypeManager.int64_type || r == TypeManager.int64_type){
2256 // If either operand is of type long, the other operand is converted
2259 if (l != TypeManager.int64_type)
2260 left = ConvertImplicit (tc, left, TypeManager.int64_type, location);
2261 if (r != TypeManager.int64_type)
2262 right = ConvertImplicit (tc, right, TypeManager.int64_type, location);
2264 type = TypeManager.int64_type;
2265 } else if (l == TypeManager.uint32_type || r == TypeManager.uint32_type){
2267 // If either operand is of type uint, and the other
2268 // operand is of type sbyte, short or int, othe operands are
2269 // converted to type long.
2273 if (l == TypeManager.uint32_type)
2275 else if (r == TypeManager.uint32_type)
2278 if ((other == TypeManager.sbyte_type) ||
2279 (other == TypeManager.short_type) ||
2280 (other == TypeManager.int32_type)){
2281 left = ForceConversion (tc, left, TypeManager.int64_type);
2282 right = ForceConversion (tc, right, TypeManager.int64_type);
2283 type = TypeManager.int64_type;
2286 // if either operand is of type uint, the other
2287 // operand is converd to type uint
2289 left = ForceConversion (tc, left, TypeManager.uint32_type);
2290 right = ForceConversion (tc, right, TypeManager.uint32_type);
2291 type = TypeManager.uint32_type;
2293 } else if (l == TypeManager.decimal_type || r == TypeManager.decimal_type){
2294 if (l != TypeManager.decimal_type)
2295 left = ConvertImplicit (tc, left, TypeManager.decimal_type, location);
2296 if (r != TypeManager.decimal_type)
2297 right = ConvertImplicit (tc, right, TypeManager.decimal_type, location);
2299 type = TypeManager.decimal_type;
2301 Expression l_tmp, r_tmp;
2303 l_tmp = ForceConversion (tc, left, TypeManager.int32_type);
2304 if (l_tmp == null) {
2310 r_tmp = ForceConversion (tc, right, TypeManager.int32_type);
2311 if (r_tmp == null) {
2317 type = TypeManager.int32_type;
2321 void error19 (TypeContainer tc)
2323 Error (tc, 19, location,
2324 "Operator " + OperName () + " cannot be applied to operands of type `" +
2325 TypeManager.CSharpName (left.Type) + "' and `" +
2326 TypeManager.CSharpName (right.Type) + "'");
2330 Expression CheckShiftArguments (TypeContainer tc)
2334 Type r = right.Type;
2336 e = ForceConversion (tc, right, TypeManager.int32_type);
2343 Location loc = location;
2345 if (((e = ConvertImplicit (tc, left, TypeManager.int32_type, loc)) != null) ||
2346 ((e = ConvertImplicit (tc, left, TypeManager.uint32_type, loc)) != null) ||
2347 ((e = ConvertImplicit (tc, left, TypeManager.int64_type, loc)) != null) ||
2348 ((e = ConvertImplicit (tc, left, TypeManager.uint64_type, loc)) != null)){
2358 Expression ResolveOperator (TypeContainer tc)
2361 Type r = right.Type;
2364 // Step 1: Perform Operator Overload location
2366 Expression left_expr, right_expr;
2368 string op = "op_" + oper;
2370 left_expr = MemberLookup (tc, l, op, false);
2371 if (left_expr == null && l.BaseType != null)
2372 left_expr = MemberLookup (tc, l.BaseType, op, false);
2374 right_expr = MemberLookup (tc, r, op, false);
2375 if (right_expr == null && r.BaseType != null)
2376 right_expr = MemberLookup (tc, r.BaseType, op, false);
2378 MethodGroupExpr union = Invocation.MakeUnionSet (left_expr, right_expr);
2380 if (union != null) {
2381 Arguments = new ArrayList ();
2382 Arguments.Add (new Argument (left, Argument.AType.Expression));
2383 Arguments.Add (new Argument (right, Argument.AType.Expression));
2385 method = Invocation.OverloadResolve (tc, union, Arguments, location);
2386 if (method != null) {
2387 MethodInfo mi = (MethodInfo) method;
2388 type = mi.ReturnType;
2397 // Step 2: Default operations on CLI native types.
2400 // Only perform numeric promotions on:
2401 // +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
2403 if (oper == Operator.Addition){
2405 // If any of the arguments is a string, cast to string
2407 if (l == TypeManager.string_type){
2408 if (r == TypeManager.string_type){
2410 method = TypeManager.string_concat_string_string;
2413 method = TypeManager.string_concat_object_object;
2414 right = ConvertImplicit (tc, right,
2415 TypeManager.object_type, location);
2417 type = TypeManager.string_type;
2419 Arguments = new ArrayList ();
2420 Arguments.Add (new Argument (left, Argument.AType.Expression));
2421 Arguments.Add (new Argument (right, Argument.AType.Expression));
2425 } else if (r == TypeManager.string_type){
2427 method = TypeManager.string_concat_object_object;
2428 Arguments = new ArrayList ();
2429 Arguments.Add (new Argument (left, Argument.AType.Expression));
2430 Arguments.Add (new Argument (right, Argument.AType.Expression));
2432 left = ConvertImplicit (tc, left, TypeManager.object_type, location);
2433 type = TypeManager.string_type;
2439 // FIXME: is Delegate operator + (D x, D y) handled?
2443 if (oper == Operator.LeftShift || oper == Operator.RightShift)
2444 return CheckShiftArguments (tc);
2446 if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
2447 if (l != TypeManager.bool_type || r != TypeManager.bool_type)
2450 type = TypeManager.bool_type;
2455 // We are dealing with numbers
2458 DoNumericPromotions (tc, l, r);
2460 if (left == null || right == null)
2464 if (oper == Operator.BitwiseAnd ||
2465 oper == Operator.BitwiseOr ||
2466 oper == Operator.ExclusiveOr){
2467 if (!((l == TypeManager.int32_type) ||
2468 (l == TypeManager.uint32_type) ||
2469 (l == TypeManager.int64_type) ||
2470 (l == TypeManager.uint64_type))){
2477 if (oper == Operator.Equality ||
2478 oper == Operator.Inequality ||
2479 oper == Operator.LessThanOrEqual ||
2480 oper == Operator.LessThan ||
2481 oper == Operator.GreaterThanOrEqual ||
2482 oper == Operator.GreaterThan){
2483 type = TypeManager.bool_type;
2489 public override Expression DoResolve (TypeContainer tc)
2491 left = left.Resolve (tc);
2492 right = right.Resolve (tc);
2494 if (left == null || right == null)
2497 if (left.Type == null)
2498 throw new Exception (
2499 "Resolve returned non null, but did not set the type! (" +
2501 if (right.Type == null)
2502 throw new Exception (
2503 "Resolve returned non null, but did not set the type! (" +
2506 eclass = ExprClass.Value;
2508 return ResolveOperator (tc);
2511 public bool IsBranchable ()
2513 if (oper == Operator.Equality ||
2514 oper == Operator.Inequality ||
2515 oper == Operator.LessThan ||
2516 oper == Operator.GreaterThan ||
2517 oper == Operator.LessThanOrEqual ||
2518 oper == Operator.GreaterThanOrEqual){
2525 // This entry point is used by routines that might want
2526 // to emit a brfalse/brtrue after an expression, and instead
2527 // they could use a more compact notation.
2529 // Typically the code would generate l.emit/r.emit, followed
2530 // by the comparission and then a brtrue/brfalse. The comparissions
2531 // are sometimes inneficient (there are not as complete as the branches
2532 // look for the hacks in Emit using double ceqs).
2534 // So for those cases we provide EmitBranchable that can emit the
2535 // branch with the test
2537 public void EmitBranchable (EmitContext ec, int target)
2540 bool close_target = false;
2546 case Operator.Equality:
2548 opcode = OpCodes.Beq_S;
2550 opcode = OpCodes.Beq;
2553 case Operator.Inequality:
2555 opcode = OpCodes.Bne_Un_S;
2557 opcode = OpCodes.Bne_Un;
2560 case Operator.LessThan:
2562 opcode = OpCodes.Blt_S;
2564 opcode = OpCodes.Blt;
2567 case Operator.GreaterThan:
2569 opcode = OpCodes.Bgt_S;
2571 opcode = OpCodes.Bgt;
2574 case Operator.LessThanOrEqual:
2576 opcode = OpCodes.Ble_S;
2578 opcode = OpCodes.Ble;
2581 case Operator.GreaterThanOrEqual:
2583 opcode = OpCodes.Bge_S;
2585 opcode = OpCodes.Ble;
2589 throw new Exception ("EmitBranchable called on non-EmitBranchable operator: "
2590 + oper.ToString ());
2593 ec.ig.Emit (opcode, target);
2596 public override void Emit (EmitContext ec)
2598 ILGenerator ig = ec.ig;
2600 Type r = right.Type;
2603 if (method != null) {
2605 // Note that operators are static anyway
2607 if (Arguments != null)
2608 Invocation.EmitArguments (ec, method, Arguments);
2610 if (method is MethodInfo)
2611 ig.Emit (OpCodes.Call, (MethodInfo) method);
2613 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
2622 case Operator.Multiply:
2624 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2625 opcode = OpCodes.Mul_Ovf;
2626 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2627 opcode = OpCodes.Mul_Ovf_Un;
2629 opcode = OpCodes.Mul;
2631 opcode = OpCodes.Mul;
2635 case Operator.Division:
2636 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2637 opcode = OpCodes.Div_Un;
2639 opcode = OpCodes.Div;
2642 case Operator.Modulus:
2643 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2644 opcode = OpCodes.Rem_Un;
2646 opcode = OpCodes.Rem;
2649 case Operator.Addition:
2651 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2652 opcode = OpCodes.Add_Ovf;
2653 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2654 opcode = OpCodes.Add_Ovf_Un;
2656 opcode = OpCodes.Mul;
2658 opcode = OpCodes.Add;
2661 case Operator.Subtraction:
2663 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2664 opcode = OpCodes.Sub_Ovf;
2665 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2666 opcode = OpCodes.Sub_Ovf_Un;
2668 opcode = OpCodes.Sub;
2670 opcode = OpCodes.Sub;
2673 case Operator.RightShift:
2674 opcode = OpCodes.Shr;
2677 case Operator.LeftShift:
2678 opcode = OpCodes.Shl;
2681 case Operator.Equality:
2682 opcode = OpCodes.Ceq;
2685 case Operator.Inequality:
2686 ec.ig.Emit (OpCodes.Ceq);
2687 ec.ig.Emit (OpCodes.Ldc_I4_0);
2689 opcode = OpCodes.Ceq;
2692 case Operator.LessThan:
2693 opcode = OpCodes.Clt;
2696 case Operator.GreaterThan:
2697 opcode = OpCodes.Cgt;
2700 case Operator.LessThanOrEqual:
2701 ec.ig.Emit (OpCodes.Cgt);
2702 ec.ig.Emit (OpCodes.Ldc_I4_0);
2704 opcode = OpCodes.Ceq;
2707 case Operator.GreaterThanOrEqual:
2708 ec.ig.Emit (OpCodes.Clt);
2709 ec.ig.Emit (OpCodes.Ldc_I4_1);
2711 opcode = OpCodes.Sub;
2714 case Operator.LogicalOr:
2715 case Operator.BitwiseOr:
2716 opcode = OpCodes.Or;
2719 case Operator.LogicalAnd:
2720 case Operator.BitwiseAnd:
2721 opcode = OpCodes.And;
2724 case Operator.ExclusiveOr:
2725 opcode = OpCodes.Xor;
2729 throw new Exception ("This should not happen: Operator = "
2730 + oper.ToString ());
2737 public class Conditional : Expression {
2738 Expression expr, trueExpr, falseExpr;
2741 public Conditional (Expression expr, Expression trueExpr, Expression falseExpr, Location l)
2744 this.trueExpr = trueExpr;
2745 this.falseExpr = falseExpr;
2749 public Expression Expr {
2755 public Expression TrueExpr {
2761 public Expression FalseExpr {
2767 public override Expression DoResolve (TypeContainer tc)
2769 expr = expr.Resolve (tc);
2771 if (expr.Type != TypeManager.bool_type)
2772 expr = Expression.ConvertImplicitRequired (
2773 tc, expr, TypeManager.bool_type, l);
2775 trueExpr = trueExpr.Resolve (tc);
2776 falseExpr = falseExpr.Resolve (tc);
2778 if (expr == null || trueExpr == null || falseExpr == null)
2781 if (trueExpr.Type == falseExpr.Type)
2782 type = trueExpr.Type;
2787 // First, if an implicit conversion exists from trueExpr
2788 // to falseExpr, then the result type is of type falseExpr.Type
2790 conv = ConvertImplicit (tc, trueExpr, falseExpr.Type, l);
2792 type = falseExpr.Type;
2794 } else if ((conv = ConvertImplicit (tc,falseExpr,trueExpr.Type,l)) != null){
2795 type = trueExpr.Type;
2798 Error (tc, 173, l, "The type of the conditional expression can " +
2799 "not be computed because there is no implicit conversion" +
2800 " from `" + TypeManager.CSharpName (trueExpr.Type) + "'" +
2801 " and `" + TypeManager.CSharpName (falseExpr.Type) + "'");
2806 eclass = ExprClass.Value;
2810 public override void Emit (EmitContext ec)
2812 ILGenerator ig = ec.ig;
2813 Label false_target = ig.DefineLabel ();
2814 Label end_target = ig.DefineLabel ();
2817 ig.Emit (OpCodes.Brfalse, false_target);
2819 ig.Emit (OpCodes.Br, end_target);
2820 ig.MarkLabel (false_target);
2821 falseExpr.Emit (ec);
2822 ig.MarkLabel (end_target);
2826 public class SimpleName : Expression {
2827 public readonly string Name;
2828 public readonly Location Location;
2830 public SimpleName (string name, Location l)
2837 // Checks whether we are trying to access an instance
2838 // property, method or field from a static body.
2840 Expression MemberStaticCheck (Expression e)
2842 if (e is FieldExpr){
2843 FieldInfo fi = ((FieldExpr) e).FieldInfo;
2848 "An object reference is required " +
2849 "for the non-static field `"+Name+"'");
2852 } else if (e is MethodGroupExpr){
2853 // FIXME: Pending reorganization of MemberLookup
2854 // Basically at this point we should have the
2855 // best match already selected for us, and
2856 // we should only have to check a *single*
2857 // Method for its static on/off bit.
2859 } else if (e is PropertyExpr){
2860 if (!((PropertyExpr) e).IsStatic){
2862 "An object reference is required " +
2863 "for the non-static property access `"+
2873 // 7.5.2: Simple Names.
2875 // Local Variables and Parameters are handled at
2876 // parse time, so they never occur as SimpleNames.
2878 Expression ResolveSimpleName (TypeContainer tc)
2882 e = MemberLookup (tc, tc.TypeBuilder, Name, true);
2886 else if (e is FieldExpr){
2887 FieldExpr fe = (FieldExpr) e;
2889 if (!fe.FieldInfo.IsStatic)
2890 fe.Instance = new This ();
2893 if ((tc.ModFlags & Modifiers.STATIC) != 0)
2894 return MemberStaticCheck (e);
2900 // Do step 3 of the Simple Name resolution.
2902 // FIXME: implement me.
2904 Error (tc, 103, Location, "The name `" + Name + "' does not exist in the class `" +
2911 // SimpleName needs to handle a multitude of cases:
2913 // simple_names and qualified_identifiers are placed on
2914 // the tree equally.
2916 public override Expression DoResolve (TypeContainer tc)
2918 if (Name.IndexOf (".") != -1)
2919 return ResolveMemberAccess (tc, Name);
2921 return ResolveSimpleName (tc);
2924 public override void Emit (EmitContext ec)
2926 throw new Exception ("SimpleNames should be gone from the tree");
2931 // A simple interface that should be implemeneted by LValues
2933 public interface LValue {
2936 // The Store method should store the contents of the top
2937 // of the stack into the storage that is implemented by
2938 // the particular implementation of LValue
2940 void Store (EmitContext ec);
2943 // The AddressOf method should generate code that loads
2944 // the address of the LValue and leaves it on the stack
2946 void AddressOf (EmitContext ec);
2949 public class LocalVariableReference : Expression, LValue {
2950 public readonly string Name;
2951 public readonly Block Block;
2953 public LocalVariableReference (Block block, string name)
2957 eclass = ExprClass.Variable;
2960 public VariableInfo VariableInfo {
2962 return Block.GetVariableInfo (Name);
2966 public override Expression DoResolve (TypeContainer tc)
2968 VariableInfo vi = Block.GetVariableInfo (Name);
2970 type = vi.VariableType;
2974 public override void Emit (EmitContext ec)
2976 VariableInfo vi = VariableInfo;
2977 ILGenerator ig = ec.ig;
2984 ig.Emit (OpCodes.Ldloc_0);
2988 ig.Emit (OpCodes.Ldloc_1);
2992 ig.Emit (OpCodes.Ldloc_2);
2996 ig.Emit (OpCodes.Ldloc_3);
3001 ig.Emit (OpCodes.Ldloc_S, (byte) idx);
3003 ig.Emit (OpCodes.Ldloc, idx);
3008 public void Store (EmitContext ec)
3010 ILGenerator ig = ec.ig;
3011 VariableInfo vi = VariableInfo;
3017 ig.Emit (OpCodes.Stloc_0);
3021 ig.Emit (OpCodes.Stloc_1);
3025 ig.Emit (OpCodes.Stloc_2);
3029 ig.Emit (OpCodes.Stloc_3);
3034 ig.Emit (OpCodes.Stloc_S, (byte) idx);
3036 ig.Emit (OpCodes.Stloc, idx);
3041 public void AddressOf (EmitContext ec)
3043 VariableInfo vi = VariableInfo;
3050 ec.ig.Emit (OpCodes.Ldloca_S, (byte) idx);
3052 ec.ig.Emit (OpCodes.Ldloca, idx);
3056 public class ParameterReference : Expression, LValue {
3057 public readonly Parameters Pars;
3058 public readonly String Name;
3059 public readonly int Idx;
3061 public ParameterReference (Parameters pars, int idx, string name)
3066 eclass = ExprClass.Variable;
3069 public override Expression DoResolve (TypeContainer tc)
3071 Type [] types = Pars.GetParameterInfo (tc);
3078 public override void Emit (EmitContext ec)
3081 ec.ig.Emit (OpCodes.Ldarg_S, (byte) Idx);
3083 ec.ig.Emit (OpCodes.Ldarg, Idx);
3086 public void Store (EmitContext ec)
3089 ec.ig.Emit (OpCodes.Starg_S, (byte) Idx);
3091 ec.ig.Emit (OpCodes.Starg, Idx);
3095 public void AddressOf (EmitContext ec)
3098 ec.ig.Emit (OpCodes.Ldarga_S, (byte) Idx);
3100 ec.ig.Emit (OpCodes.Ldarga, Idx);
3105 // Used for arguments to New(), Invocation()
3107 public class Argument {
3114 public readonly AType Type;
3117 public Argument (Expression expr, AType type)
3123 public Expression Expr {
3133 public bool Resolve (TypeContainer tc)
3135 expr = expr.Resolve (tc);
3137 return expr != null;
3140 public void Emit (EmitContext ec)
3147 // Invocation of methods or delegates.
3149 public class Invocation : ExpressionStatement {
3150 public readonly ArrayList Arguments;
3151 public readonly Location Location;
3154 MethodBase method = null;
3156 static Hashtable method_parameter_cache;
3158 static Invocation ()
3160 method_parameter_cache = new Hashtable ();
3164 // arguments is an ArrayList, but we do not want to typecast,
3165 // as it might be null.
3167 // FIXME: only allow expr to be a method invocation or a
3168 // delegate invocation (7.5.5)
3170 public Invocation (Expression expr, ArrayList arguments, Location l)
3173 Arguments = arguments;
3177 public Expression Expr {
3184 // Returns the Parameters (a ParameterData interface) for the
3187 public static ParameterData GetParameterData (MethodBase mb)
3189 object pd = method_parameter_cache [mb];
3192 return (ParameterData) pd;
3194 if (mb is MethodBuilder || mb is ConstructorBuilder){
3195 MethodCore mc = TypeContainer.LookupMethodByBuilder (mb);
3197 InternalParameters ip = mc.ParameterInfo;
3198 method_parameter_cache [mb] = ip;
3200 return (ParameterData) ip;
3202 ParameterInfo [] pi = mb.GetParameters ();
3203 ReflectionParameters rp = new ReflectionParameters (pi);
3204 method_parameter_cache [mb] = rp;
3206 return (ParameterData) rp;
3211 // Tells whether a user defined conversion from Type `from' to
3212 // Type `to' exists.
3214 // FIXME: we could implement a cache here.
3216 static bool ConversionExists (TypeContainer tc, Type from, Type to)
3218 // Locate user-defined implicit operators
3222 mg = MemberLookup (tc, to, "op_Implicit", false);
3225 MethodGroupExpr me = (MethodGroupExpr) mg;
3227 for (int i = me.Methods.Length; i > 0;) {
3229 MethodBase mb = me.Methods [i];
3230 ParameterData pd = GetParameterData (mb);
3232 if (from == pd.ParameterType (0))
3237 mg = MemberLookup (tc, from, "op_Implicit", false);
3240 MethodGroupExpr me = (MethodGroupExpr) mg;
3242 for (int i = me.Methods.Length; i > 0;) {
3244 MethodBase mb = me.Methods [i];
3245 MethodInfo mi = (MethodInfo) mb;
3247 if (mi.ReturnType == to)
3256 // Determines "better conversion" as specified in 7.4.2.3
3257 // Returns : 1 if a->p is better
3258 // 0 if a->q or neither is better
3260 static int BetterConversion (TypeContainer tc, Argument a, Type p, Type q, bool use_standard)
3263 Type argument_type = a.Expr.Type;
3264 Expression argument_expr = a.Expr;
3266 if (argument_type == null)
3267 throw new Exception ("Expression of type " + a.Expr + " does not resolve its type");
3272 if (argument_type == p)
3275 if (argument_type == q)
3279 // Now probe whether an implicit constant expression conversion
3282 // An implicit constant expression conversion permits the following
3285 // * A constant-expression of type `int' can be converted to type
3286 // sbyte, byute, short, ushort, uint, ulong provided the value of
3287 // of the expression is withing the range of the destination type.
3289 // * A constant-expression of type long can be converted to type
3290 // ulong, provided the value of the constant expression is not negative
3292 // FIXME: Note that this assumes that constant folding has
3293 // taken place. We dont do constant folding yet.
3296 if (argument_expr is IntLiteral){
3297 IntLiteral ei = (IntLiteral) argument_expr;
3298 int value = ei.Value;
3300 if (p == TypeManager.sbyte_type){
3301 if (value >= SByte.MinValue && value <= SByte.MaxValue)
3303 } else if (p == TypeManager.byte_type){
3304 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
3306 } else if (p == TypeManager.short_type){
3307 if (value >= Int16.MinValue && value <= Int16.MaxValue)
3309 } else if (p == TypeManager.ushort_type){
3310 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
3312 } else if (p == TypeManager.uint32_type){
3314 // we can optimize this case: a positive int32
3315 // always fits on a uint32
3319 } else if (p == TypeManager.uint64_type){
3321 // we can optimize this case: a positive int32
3322 // always fits on a uint64
3327 } else if (argument_type == TypeManager.int64_type && argument_expr is LongLiteral){
3328 LongLiteral ll = (LongLiteral) argument_expr;
3330 if (p == TypeManager.uint64_type){
3341 tmp = ConvertImplicitStandard (tc, argument_expr, p, Location.Null);
3343 tmp = ConvertImplicit (tc, argument_expr, p, Location.Null);
3352 if (ConversionExists (tc, p, q) == true &&
3353 ConversionExists (tc, q, p) == false)
3356 if (p == TypeManager.sbyte_type)
3357 if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
3358 q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3361 if (p == TypeManager.short_type)
3362 if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
3363 q == TypeManager.uint64_type)
3366 if (p == TypeManager.int32_type)
3367 if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3370 if (p == TypeManager.int64_type)
3371 if (q == TypeManager.uint64_type)
3378 // Determines "Better function" and returns an integer indicating :
3379 // 0 if candidate ain't better
3380 // 1 if candidate is better than the current best match
3382 static int BetterFunction (TypeContainer tc, ArrayList args,
3383 MethodBase candidate, MethodBase best,
3386 ParameterData candidate_pd = GetParameterData (candidate);
3387 ParameterData best_pd;
3393 argument_count = args.Count;
3395 if (candidate_pd.Count == 0 && argument_count == 0)
3399 if (candidate_pd.Count == argument_count) {
3401 for (int j = argument_count; j > 0;) {
3404 Argument a = (Argument) args [j];
3406 x = BetterConversion (
3407 tc, a, candidate_pd.ParameterType (j), null,
3423 best_pd = GetParameterData (best);
3425 if (candidate_pd.Count == argument_count && best_pd.Count == argument_count) {
3426 int rating1 = 0, rating2 = 0;
3428 for (int j = argument_count; j > 0;) {
3432 Argument a = (Argument) args [j];
3434 x = BetterConversion (tc, a, candidate_pd.ParameterType (j),
3435 best_pd.ParameterType (j), use_standard);
3436 y = BetterConversion (tc, a, best_pd.ParameterType (j),
3437 candidate_pd.ParameterType (j), use_standard);
3443 if (rating1 > rating2)
3452 public static string FullMethodDesc (MethodBase mb)
3454 StringBuilder sb = new StringBuilder (mb.Name);
3455 ParameterData pd = GetParameterData (mb);
3458 for (int i = pd.Count; i > 0;) {
3460 sb.Append (TypeManager.CSharpName (pd.ParameterType (i)));
3466 return sb.ToString ();
3469 public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2)
3471 MemberInfo [] miset;
3472 MethodGroupExpr union;
3474 if (mg1 != null && mg2 != null) {
3476 MethodGroupExpr left_set = null, right_set = null;
3477 int length1 = 0, length2 = 0;
3479 left_set = (MethodGroupExpr) mg1;
3480 length1 = left_set.Methods.Length;
3482 right_set = (MethodGroupExpr) mg2;
3483 length2 = right_set.Methods.Length;
3485 ArrayList common = new ArrayList ();
3487 for (int i = 0; i < left_set.Methods.Length; i++) {
3488 for (int j = 0; j < right_set.Methods.Length; j++) {
3489 if (left_set.Methods [i] == right_set.Methods [j])
3490 common.Add (left_set.Methods [i]);
3494 miset = new MemberInfo [length1 + length2 - common.Count];
3496 left_set.Methods.CopyTo (miset, 0);
3500 for (int j = 0; j < right_set.Methods.Length; j++)
3501 if (!common.Contains (right_set.Methods [j]))
3502 miset [length1 + k++] = right_set.Methods [j];
3504 union = new MethodGroupExpr (miset);
3508 } else if (mg1 == null && mg2 != null) {
3510 MethodGroupExpr me = (MethodGroupExpr) mg2;
3512 miset = new MemberInfo [me.Methods.Length];
3513 me.Methods.CopyTo (miset, 0);
3515 union = new MethodGroupExpr (miset);
3519 } else if (mg2 == null && mg1 != null) {
3521 MethodGroupExpr me = (MethodGroupExpr) mg1;
3523 miset = new MemberInfo [me.Methods.Length];
3524 me.Methods.CopyTo (miset, 0);
3526 union = new MethodGroupExpr (miset);
3535 // Find the Applicable Function Members (7.4.2.1)
3537 // me: Method Group expression with the members to select.
3538 // it might contain constructors or methods (or anything
3539 // that maps to a method).
3541 // Arguments: ArrayList containing resolved Argument objects.
3543 // loc: The location if we want an error to be reported, or a Null
3544 // location for "probing" purposes.
3546 // inside_user_defined: controls whether OverloadResolve should use the
3547 // ConvertImplicit or ConvertImplicitStandard during overload resolution.
3549 // Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
3550 // that is the best match of me on Arguments.
3553 public static MethodBase OverloadResolve (TypeContainer tc, MethodGroupExpr me,
3554 ArrayList Arguments, Location loc,
3557 ArrayList afm = new ArrayList ();
3558 int best_match_idx = -1;
3559 MethodBase method = null;
3562 for (int i = me.Methods.Length; i > 0; ){
3564 MethodBase candidate = me.Methods [i];
3567 x = BetterFunction (tc, Arguments, candidate, method, use_standard);
3573 method = me.Methods [best_match_idx];
3577 if (Arguments == null)
3580 argument_count = Arguments.Count;
3584 // Now we see if we can at least find a method with the same number of arguments
3585 // and then try doing implicit conversion on the arguments
3586 if (best_match_idx == -1) {
3588 for (int i = me.Methods.Length; i > 0;) {
3590 MethodBase mb = me.Methods [i];
3591 pd = GetParameterData (mb);
3593 if (pd.Count == argument_count) {
3595 method = me.Methods [best_match_idx];
3606 // And now convert implicitly, each argument to the required type
3608 pd = GetParameterData (method);
3610 for (int j = argument_count; j > 0;) {
3612 Argument a = (Argument) Arguments [j];
3613 Expression a_expr = a.Expr;
3614 Type parameter_type = pd.ParameterType (j);
3616 if (a_expr.Type != parameter_type){
3620 conv = ConvertImplicitStandard (tc, a_expr, parameter_type,
3623 conv = ConvertImplicit (tc, a_expr, parameter_type,
3627 if (!Location.IsNull (loc)) {
3628 Error (tc, 1502, loc,
3629 "The best overloaded match for method '" + FullMethodDesc (method) +
3630 "' has some invalid arguments");
3631 Error (tc, 1503, loc,
3632 "Argument " + (j+1) +
3633 ": Cannot convert from '" + TypeManager.CSharpName (a_expr.Type)
3634 + "' to '" + TypeManager.CSharpName (pd.ParameterType (j)) + "'");
3639 // Update the argument with the implicit conversion
3649 public static MethodBase OverloadResolve (TypeContainer tc, MethodGroupExpr me,
3650 ArrayList Arguments, Location loc)
3652 return OverloadResolve (tc, me, Arguments, loc, false);
3655 public override Expression DoResolve (TypeContainer tc)
3658 // First, resolve the expression that is used to
3659 // trigger the invocation
3661 this.expr = expr.Resolve (tc);
3662 if (this.expr == null)
3665 if (!(this.expr is MethodGroupExpr)){
3666 report118 (tc, Location, this.expr, "method group");
3671 // Next, evaluate all the expressions in the argument list
3673 if (Arguments != null){
3674 for (int i = Arguments.Count; i > 0;){
3676 Argument a = (Argument) Arguments [i];
3678 if (!a.Resolve (tc))
3683 method = OverloadResolve (tc, (MethodGroupExpr) this.expr, Arguments,
3686 if (method == null){
3687 Error (tc, -6, Location,
3688 "Could not find any applicable function for this argument list");
3692 if (method is MethodInfo)
3693 type = ((MethodInfo)method).ReturnType;
3695 eclass = ExprClass.Value;
3699 public static void EmitArguments (EmitContext ec, MethodBase method, ArrayList Arguments)
3703 if (Arguments != null)
3704 top = Arguments.Count;
3708 for (int i = 0; i < top; i++){
3709 Argument a = (Argument) Arguments [i];
3715 public override void Emit (EmitContext ec)
3717 bool is_static = method.IsStatic;
3720 MethodGroupExpr mg = (MethodGroupExpr) this.expr;
3723 // If this is ourselves, push "this"
3725 if (mg.InstanceExpression == null){
3726 ec.ig.Emit (OpCodes.Ldarg_0);
3729 // Push the instance expression
3731 mg.InstanceExpression.Emit (ec);
3735 if (Arguments != null)
3736 EmitArguments (ec, method, Arguments);
3739 if (method is MethodInfo)
3740 ec.ig.Emit (OpCodes.Call, (MethodInfo) method);
3742 ec.ig.Emit (OpCodes.Call, (ConstructorInfo) method);
3744 if (method is MethodInfo)
3745 ec.ig.Emit (OpCodes.Callvirt, (MethodInfo) method);
3747 ec.ig.Emit (OpCodes.Callvirt, (ConstructorInfo) method);
3751 public override void EmitStatement (EmitContext ec)
3756 // Pop the return value if there is one
3758 if (method is MethodInfo){
3759 if (((MethodInfo)method).ReturnType != TypeManager.void_type)
3760 ec.ig.Emit (OpCodes.Pop);
3765 public class New : ExpressionStatement {
3772 public readonly NType NewType;
3773 public readonly ArrayList Arguments;
3774 public readonly string RequestedType;
3775 // These are for the case when we have an array
3776 public readonly string Rank;
3777 public readonly ArrayList Indices;
3778 public readonly ArrayList Initializers;
3781 MethodBase method = null;
3783 public New (string requested_type, ArrayList arguments, Location loc)
3785 RequestedType = requested_type;
3786 Arguments = arguments;
3787 NewType = NType.Object;
3791 public New (string requested_type, ArrayList exprs, string rank, ArrayList initializers, Location loc)
3793 RequestedType = requested_type;
3796 Initializers = initializers;
3797 NewType = NType.Array;
3801 public override Expression DoResolve (TypeContainer tc)
3803 type = tc.LookupType (RequestedType, false);
3810 ml = MemberLookup (tc, type, ".ctor", false,
3811 MemberTypes.Constructor, AllBindingsFlags);
3813 if (! (ml is MethodGroupExpr)){
3815 // FIXME: Find proper error
3817 report118 (tc, Location, ml, "method group");
3821 if (Arguments != null){
3822 for (int i = Arguments.Count; i > 0;){
3824 Argument a = (Argument) Arguments [i];
3826 if (!a.Resolve (tc))
3831 method = Invocation.OverloadResolve (tc, (MethodGroupExpr) ml, Arguments,
3834 if (method == null) {
3835 Error (tc, -6, Location,
3836 "New invocation: Can not find a constructor for this argument list");
3840 eclass = ExprClass.Value;
3844 public override void Emit (EmitContext ec)
3846 Invocation.EmitArguments (ec, method, Arguments);
3847 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
3850 public override void EmitStatement (EmitContext ec)
3853 ec.ig.Emit (OpCodes.Pop);
3858 // Represents the `this' construct
3860 public class This : Expression, LValue {
3861 public override Expression DoResolve (TypeContainer tc)
3863 eclass = ExprClass.Variable;
3864 type = tc.TypeBuilder;
3867 // FIXME: Verify that this is only used in instance contexts.
3872 public override void Emit (EmitContext ec)
3874 ec.ig.Emit (OpCodes.Ldarg_0);
3877 public void Store (EmitContext ec)
3880 // Assignment to the "this" variable.
3882 // FIXME: Apparently this is a bug that we
3883 // must catch as `this' seems to be readonly ;-)
3885 ec.ig.Emit (OpCodes.Starg, 0);
3888 public void AddressOf (EmitContext ec)
3890 ec.ig.Emit (OpCodes.Ldarga_S, (byte) 0);
3895 // Implements the typeof operator
3897 public class TypeOf : Expression {
3898 public readonly string QueriedType;
3901 public TypeOf (string queried_type)
3903 QueriedType = queried_type;
3906 public override Expression DoResolve (TypeContainer tc)
3908 typearg = tc.LookupType (QueriedType, false);
3910 if (typearg == null)
3913 type = TypeManager.type_type;
3914 eclass = ExprClass.Type;
3918 public override void Emit (EmitContext ec)
3920 ec.ig.Emit (OpCodes.Ldtoken, typearg);
3921 ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
3925 public class SizeOf : Expression {
3926 public readonly string QueriedType;
3928 public SizeOf (string queried_type)
3930 this.QueriedType = queried_type;
3933 public override Expression DoResolve (TypeContainer tc)
3935 // FIXME: Implement;
3936 throw new Exception ("Unimplemented");
3940 public override void Emit (EmitContext ec)
3942 throw new Exception ("Implement me");
3946 public class MemberAccess : Expression {
3947 public readonly string Identifier;
3949 Expression member_lookup;
3951 public MemberAccess (Expression expr, string id)
3957 public Expression Expr {
3963 public override Expression DoResolve (TypeContainer tc)
3965 Expression new_expression = expr.Resolve (tc);
3967 if (new_expression == null)
3970 member_lookup = MemberLookup (tc, expr.Type, Identifier, false);
3972 if (member_lookup is MethodGroupExpr){
3973 MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
3976 // Bind the instance expression to it
3978 // FIXME: This is a horrible way of detecting if it is
3979 // an instance expression. Figure out how to fix this.
3982 if (expr is LocalVariableReference ||
3983 expr is ParameterReference ||
3985 mg.InstanceExpression = expr;
3987 return member_lookup;
3988 } else if (member_lookup is FieldExpr){
3989 FieldExpr fe = (FieldExpr) member_lookup;
3993 return member_lookup;
3996 // FIXME: This should generate the proper node
3997 // ie, for a Property Access, it should like call it
4000 return member_lookup;
4003 public override void Emit (EmitContext ec)
4005 throw new Exception ("Should not happen I think");
4011 // Nodes of type Namespace are created during the semantic
4012 // analysis to resolve member_access/qualified_identifier/simple_name
4015 // They are born `resolved'.
4017 public class NamespaceExpr : Expression {
4018 public readonly string Name;
4020 public NamespaceExpr (string name)
4023 eclass = ExprClass.Namespace;
4026 public override Expression DoResolve (TypeContainer tc)
4031 public override void Emit (EmitContext ec)
4033 throw new Exception ("Namespace expressions should never be emitted");
4038 // Fully resolved expression that evaluates to a type
4040 public class TypeExpr : Expression {
4041 public TypeExpr (Type t)
4044 eclass = ExprClass.Type;
4047 override public Expression DoResolve (TypeContainer tc)
4052 override public void Emit (EmitContext ec)
4054 throw new Exception ("Implement me");
4059 // MethodGroup Expression.
4061 // This is a fully resolved expression that evaluates to a type
4063 public class MethodGroupExpr : Expression {
4064 public readonly MethodBase [] Methods;
4065 Expression instance_expression = null;
4067 public MethodGroupExpr (MemberInfo [] mi)
4069 Methods = new MethodBase [mi.Length];
4070 mi.CopyTo (Methods, 0);
4071 eclass = ExprClass.MethodGroup;
4075 // `A method group may have associated an instance expression'
4077 public Expression InstanceExpression {
4079 return instance_expression;
4083 instance_expression = value;
4087 override public Expression DoResolve (TypeContainer tc)
4092 override public void Emit (EmitContext ec)
4094 throw new Exception ("This should never be reached");
4098 // Fully resolved expression that evaluates to a Field
4100 public class FieldExpr : Expression, LValue {
4101 public readonly FieldInfo FieldInfo;
4102 public Expression Instance;
4104 public FieldExpr (FieldInfo fi)
4107 eclass = ExprClass.Variable;
4108 type = fi.FieldType;
4111 override public Expression DoResolve (TypeContainer tc)
4113 if (!FieldInfo.IsStatic){
4114 if (Instance == null){
4115 throw new Exception ("non-static FieldExpr without instance var\n" +
4116 "You have to assign the Instance variable\n" +
4117 "Of the FieldExpr to set this\n");
4120 Instance = Instance.Resolve (tc);
4121 if (Instance == null)
4128 override public void Emit (EmitContext ec)
4130 ILGenerator ig = ec.ig;
4132 if (FieldInfo.IsStatic)
4133 ig.Emit (OpCodes.Ldsfld, FieldInfo);
4137 ig.Emit (OpCodes.Ldfld, FieldInfo);
4141 public void Store (EmitContext ec)
4143 if (FieldInfo.IsStatic)
4144 ec.ig.Emit (OpCodes.Stsfld, FieldInfo);
4146 ec.ig.Emit (OpCodes.Stfld, FieldInfo);
4149 public void AddressOf (EmitContext ec)
4151 if (FieldInfo.IsStatic)
4152 ec.ig.Emit (OpCodes.Ldsflda, FieldInfo);
4155 ec.ig.Emit (OpCodes.Ldflda, FieldInfo);
4161 // Fully resolved expression that evaluates to a Property
4163 public class PropertyExpr : Expression {
4164 public readonly PropertyInfo PropertyInfo;
4165 public readonly bool IsStatic;
4167 public PropertyExpr (PropertyInfo pi)
4170 eclass = ExprClass.PropertyAccess;
4173 MethodBase [] acc = pi.GetAccessors ();
4175 for (int i = 0; i < acc.Length; i++)
4176 if (acc [i].IsStatic)
4179 type = pi.PropertyType;
4182 override public Expression DoResolve (TypeContainer tc)
4184 // We are born in resolved state.
4188 override public void Emit (EmitContext ec)
4190 // FIXME: Implement;
4191 throw new Exception ("Unimplemented");
4196 // Fully resolved expression that evaluates to a Expression
4198 public class EventExpr : Expression {
4199 public readonly EventInfo EventInfo;
4201 public EventExpr (EventInfo ei)
4204 eclass = ExprClass.EventAccess;
4207 override public Expression DoResolve (TypeContainer tc)
4209 // We are born in resolved state.
4213 override public void Emit (EmitContext ec)
4215 throw new Exception ("Implement me");
4216 // FIXME: Implement.
4220 public class CheckedExpr : Expression {
4222 public Expression Expr;
4224 public CheckedExpr (Expression e)
4229 public override Expression DoResolve (TypeContainer tc)
4231 Expr = Expr.Resolve (tc);
4236 eclass = Expr.ExprClass;
4241 public override void Emit (EmitContext ec)
4243 bool last_check = ec.CheckState;
4245 ec.CheckState = true;
4247 ec.CheckState = last_check;
4252 public class UnCheckedExpr : Expression {
4254 public Expression Expr;
4256 public UnCheckedExpr (Expression e)
4261 public override Expression DoResolve (TypeContainer tc)
4263 Expr = Expr.Resolve (tc);
4268 eclass = Expr.ExprClass;
4273 public override void Emit (EmitContext ec)
4275 bool last_check = ec.CheckState;
4277 ec.CheckState = false;
4279 ec.CheckState = last_check;
4284 public class ElementAccess : Expression {
4286 public readonly ArrayList Arguments;
4287 public readonly Expression Expr;
4289 public ElementAccess (Expression e, ArrayList e_list)
4295 public override Expression DoResolve (TypeContainer tc)
4297 // FIXME: Implement;
4298 throw new Exception ("Unimplemented");
4302 public override void Emit (EmitContext ec)
4304 // FIXME : Implement !
4305 throw new Exception ("Unimplemented");
4310 public class BaseAccess : Expression {
4312 public enum BaseAccessType {
4317 public readonly BaseAccessType BAType;
4318 public readonly string Member;
4319 public readonly ArrayList Arguments;
4321 public BaseAccess (BaseAccessType t, string member, ArrayList args)
4329 public override Expression DoResolve (TypeContainer tc)
4331 // FIXME: Implement;
4332 throw new Exception ("Unimplemented");
4336 public override void Emit (EmitContext ec)
4338 throw new Exception ("Unimplemented");
4342 public class UserImplicitCast : Expression {
4345 Type most_specific_source;
4346 Type most_specific_target;
4348 public UserImplicitCast (MethodInfo method, Expression source, Type most_specific_source,
4349 Type most_specific_target)
4351 this.method = method;
4352 this.source = source;
4353 this.most_specific_source = most_specific_source;
4354 this.most_specific_target = most_specific_target;
4355 type = method.ReturnType;
4356 eclass = ExprClass.Value;
4359 public override Expression DoResolve (TypeContainer tc)
4362 // We are born in a fully resolved state
4367 public override void Emit (EmitContext ec)
4369 ILGenerator ig = ec.ig;
4370 Location tmp = new Location (-1);
4372 // Note that operators are static anyway
4374 Expression e = ConvertImplicitStandard (ec.parent, source, most_specific_source, tmp);
4377 if (method is MethodInfo)
4378 ig.Emit (OpCodes.Call, (MethodInfo) method);
4380 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
projects / mono.git / blob