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[mono-project.git] / mcs / mcs / ecore.cs
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1 //
2 // ecore.cs: Core of the Expression representation for the intermediate tree.
3 //
4 // Author:
5 // Miguel de Icaza (miguel@ximian.com)
6 //
7 // (C) 2001, 2002, 2003 Ximian, Inc.
8 //
9 //
10
11 namespace Mono.CSharp {
12 using System;
13 using System.Collections;
14 using System.Diagnostics;
15 using System.Reflection;
16 using System.Reflection.Emit;
17 using System.Text;
18
19 /// <remarks>
20 /// The ExprClass class contains the is used to pass the
21 /// classification of an expression (value, variable, namespace,
22 /// type, method group, property access, event access, indexer access,
23 /// nothing).
24 /// </remarks>
25 public enum ExprClass : byte {
26 Invalid,
27
28 Value,
29 Variable,
30 Namespace,
31 Type,
32 MethodGroup,
33 PropertyAccess,
34 EventAccess,
35 IndexerAccess,
36 Nothing,
37 }
38
39 /// <remarks>
40 /// This is used to tell Resolve in which types of expressions we're
41 /// interested.
42 /// </remarks>
43 [Flags]
44 public enum ResolveFlags {
45 // Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
46 VariableOrValue = 1,
47
48 // Returns a type expression.
49 Type = 2,
50
51 // Returns a method group.
52 MethodGroup = 4,
53
54 // Allows SimpleNames to be returned.
55 // This is used by MemberAccess to construct long names that can not be
56 // partially resolved (namespace-qualified names for example).
57 SimpleName = 8,
58
59 // Mask of all the expression class flags.
60 MaskExprClass = 15,
61
62 // Disable control flow analysis while resolving the expression.
63 // This is used when resolving the instance expression of a field expression.
64 DisableFlowAnalysis = 16
65 }
66
67 //
68 // This is just as a hint to AddressOf of what will be done with the
69 // address.
70 [Flags]
71 public enum AddressOp {
72 Store = 1,
73 Load = 2,
74 LoadStore = 3
75 };
76
77 /// <summary>
78 /// This interface is implemented by variables
79 /// </summary>
80 public interface IMemoryLocation {
81 /// <summary>
82 /// The AddressOf method should generate code that loads
83 /// the address of the object and leaves it on the stack.
84 ///
85 /// The `mode' argument is used to notify the expression
86 /// of whether this will be used to read from the address or
87 /// write to the address.
88 ///
89 /// This is just a hint that can be used to provide good error
90 /// reporting, and should have no other side effects.
91 /// </summary>
92 void AddressOf (EmitContext ec, AddressOp mode);
93 }
94
95 /// <summary>
96 /// This interface is implemented by variables
97 /// </summary>
98 public interface IVariable {
99 VariableInfo VariableInfo {
100 get;
101 }
102
103 bool VerifyFixed (bool is_expression);
104 }
105
106 /// <summary>
107 /// This interface denotes an expression which evaluates to a member
108 /// of a struct or a class.
109 /// </summary>
110 public interface IMemberExpr
111 {
112 /// <summary>
113 /// The name of this member.
114 /// </summary>
115 string Name {
116 get;
117 }
118
119 /// <summary>
120 /// Whether this is an instance member.
121 /// </summary>
122 bool IsInstance {
123 get;
124 }
125
126 /// <summary>
127 /// Whether this is a static member.
128 /// </summary>
129 bool IsStatic {
130 get;
131 }
132
133 /// <summary>
134 /// The type which declares this member.
135 /// </summary>
136 Type DeclaringType {
137 get;
138 }
139
140 /// <summary>
141 /// The instance expression associated with this member, if it's a
142 /// non-static member.
143 /// </summary>
144 Expression InstanceExpression {
145 get; set;
146 }
147 }
148
149 /// <remarks>
150 /// Base class for expressions
151 /// </remarks>
152 public abstract class Expression {
153 public ExprClass eclass;
154 protected Type type;
155 protected Location loc;
156
157 public Type Type {
158 get {
159 return type;
160 }
161
162 set {
163 type = value;
164 }
165 }
166
167 public Location Location {
168 get {
169 return loc;
170 }
171 }
172
173 /// <summary>
174 /// Utility wrapper routine for Error, just to beautify the code
175 /// </summary>
176 public void Error (int error, string s)
177 {
178 if (!Location.IsNull (loc))
179 Report.Error (error, loc, s);
180 else
181 Report.Error (error, s);
182 }
183
184 /// <summary>
185 /// Utility wrapper routine for Warning, just to beautify the code
186 /// </summary>
187 public void Warning (int warning, string s)
188 {
189 if (!Location.IsNull (loc))
190 Report.Warning (warning, loc, s);
191 else
192 Report.Warning (warning, s);
193 }
194
195 /// <summary>
196 /// Utility wrapper routine for Warning, only prints the warning if
197 /// warnings of level `level' are enabled.
198 /// </summary>
199 public void Warning (int warning, int level, string s)
200 {
201 if (level <= RootContext.WarningLevel)
202 Warning (warning, s);
203 }
204
205 /// <summary>
206 /// Performs semantic analysis on the Expression
207 /// </summary>
208 ///
209 /// <remarks>
210 /// The Resolve method is invoked to perform the semantic analysis
211 /// on the node.
212 ///
213 /// The return value is an expression (it can be the
214 /// same expression in some cases) or a new
215 /// expression that better represents this node.
216 ///
217 /// For example, optimizations of Unary (LiteralInt)
218 /// would return a new LiteralInt with a negated
219 /// value.
220 ///
221 /// If there is an error during semantic analysis,
222 /// then an error should be reported (using Report)
223 /// and a null value should be returned.
224 ///
225 /// There are two side effects expected from calling
226 /// Resolve(): the the field variable "eclass" should
227 /// be set to any value of the enumeration
228 /// `ExprClass' and the type variable should be set
229 /// to a valid type (this is the type of the
230 /// expression).
231 /// </remarks>
232 public abstract Expression DoResolve (EmitContext ec);
233
234 public virtual Expression DoResolveLValue (EmitContext ec, Expression right_side)
235 {
236 return DoResolve (ec);
237 }
238
239 //
240 // This is used if the expression should be resolved as a type.
241 // the default implementation fails. Use this method in
242 // those participants in the SimpleName chain system.
243 //
244 public virtual Expression ResolveAsTypeStep (EmitContext ec)
245 {
246 return null;
247 }
248
249 //
250 // This is used to resolve the expression as a type, a null
251 // value will be returned if the expression is not a type
252 // reference
253 //
254 public TypeExpr ResolveAsTypeTerminal (EmitContext ec)
255 {
256 return ResolveAsTypeStep (ec) as TypeExpr;
257 }
258
259 /// <summary>
260 /// Resolves an expression and performs semantic analysis on it.
261 /// </summary>
262 ///
263 /// <remarks>
264 /// Currently Resolve wraps DoResolve to perform sanity
265 /// checking and assertion checking on what we expect from Resolve.
266 /// </remarks>
267 public Expression Resolve (EmitContext ec, ResolveFlags flags)
268 {
269 if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type)
270 return ResolveAsTypeStep (ec);
271
272 bool old_do_flow_analysis = ec.DoFlowAnalysis;
273 if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
274 ec.DoFlowAnalysis = false;
275
276 Expression e;
277 if (this is SimpleName)
278 e = ((SimpleName) this).DoResolveAllowStatic (ec);
279 else
280 e = DoResolve (ec);
281
282 ec.DoFlowAnalysis = old_do_flow_analysis;
283
284 if (e == null)
285 return null;
286
287 if (e is SimpleName){
288 SimpleName s = (SimpleName) e;
289
290 if ((flags & ResolveFlags.SimpleName) == 0) {
291 MemberLookupFailed (ec, null, ec.ContainerType, s.Name,
292 ec.DeclSpace.Name, loc);
293 return null;
294 }
295
296 return s;
297 }
298
299 if ((e is TypeExpr) || (e is ComposedCast)) {
300 if ((flags & ResolveFlags.Type) == 0) {
301 e.Error_UnexpectedKind (flags);
302 return null;
303 }
304
305 return e;
306 }
307
308 switch (e.eclass) {
309 case ExprClass.Type:
310 if ((flags & ResolveFlags.VariableOrValue) == 0) {
311 e.Error_UnexpectedKind (flags);
312 return null;
313 }
314 break;
315
316 case ExprClass.MethodGroup:
317 if (!RootContext.V2){
318 if ((flags & ResolveFlags.MethodGroup) == 0) {
319 ((MethodGroupExpr) e).ReportUsageError ();
320 return null;
321 }
322 }
323 break;
324
325 case ExprClass.Value:
326 case ExprClass.Variable:
327 case ExprClass.PropertyAccess:
328 case ExprClass.EventAccess:
329 case ExprClass.IndexerAccess:
330 if ((flags & ResolveFlags.VariableOrValue) == 0) {
331 Console.WriteLine ("I got: {0} and {1}", e.GetType (), e);
332 Console.WriteLine ("I am {0} and {1}", this.GetType (), this);
333 FieldInfo fi = ((FieldExpr) e).FieldInfo;
334
335 Console.WriteLine ("{0} and {1}", fi.DeclaringType, fi.Name);
336 e.Error_UnexpectedKind (flags);
337 return null;
338 }
339 break;
340
341 default:
342 throw new Exception ("Expression " + e.GetType () +
343 " ExprClass is Invalid after resolve");
344 }
345
346 if (e.type == null)
347 throw new Exception (
348 "Expression " + e.GetType () +
349 " did not set its type after Resolve\n" +
350 "called from: " + this.GetType ());
351
352 return e;
353 }
354
355 /// <summary>
356 /// Resolves an expression and performs semantic analysis on it.
357 /// </summary>
358 public Expression Resolve (EmitContext ec)
359 {
360 return Resolve (ec, ResolveFlags.VariableOrValue);
361 }
362
363 /// <summary>
364 /// Resolves an expression for LValue assignment
365 /// </summary>
366 ///
367 /// <remarks>
368 /// Currently ResolveLValue wraps DoResolveLValue to perform sanity
369 /// checking and assertion checking on what we expect from Resolve
370 /// </remarks>
371 public Expression ResolveLValue (EmitContext ec, Expression right_side)
372 {
373 Expression e = DoResolveLValue (ec, right_side);
374
375 if (e != null){
376 if (e is SimpleName){
377 SimpleName s = (SimpleName) e;
378 MemberLookupFailed (ec, null, ec.ContainerType, s.Name,
379 ec.DeclSpace.Name, loc);
380 return null;
381 }
382
383 if (e.eclass == ExprClass.Invalid)
384 throw new Exception ("Expression " + e +
385 " ExprClass is Invalid after resolve");
386
387 if (e.eclass == ExprClass.MethodGroup) {
388 ((MethodGroupExpr) e).ReportUsageError ();
389 return null;
390 }
391
392 if (e.type == null)
393 throw new Exception ("Expression " + e +
394 " did not set its type after Resolve");
395 }
396
397 return e;
398 }
399
400 /// <summary>
401 /// Emits the code for the expression
402 /// </summary>
403 ///
404 /// <remarks>
405 /// The Emit method is invoked to generate the code
406 /// for the expression.
407 /// </remarks>
408 public abstract void Emit (EmitContext ec);
409
410 public virtual void EmitBranchable (EmitContext ec, Label target, bool onTrue)
411 {
412 Emit (ec);
413 ec.ig.Emit (onTrue ? OpCodes.Brtrue : OpCodes.Brfalse, target);
414 }
415
416 /// <summary>
417 /// Protected constructor. Only derivate types should
418 /// be able to be created
419 /// </summary>
420
421 protected Expression ()
422 {
423 eclass = ExprClass.Invalid;
424 type = null;
425 }
426
427 /// <summary>
428 /// Returns a literalized version of a literal FieldInfo
429 /// </summary>
430 ///
431 /// <remarks>
432 /// The possible return values are:
433 /// IntConstant, UIntConstant
434 /// LongLiteral, ULongConstant
435 /// FloatConstant, DoubleConstant
436 /// StringConstant
437 ///
438 /// The value returned is already resolved.
439 /// </remarks>
440 public static Constant Constantify (object v, Type t)
441 {
442 if (t == TypeManager.int32_type)
443 return new IntConstant ((int) v);
444 else if (t == TypeManager.uint32_type)
445 return new UIntConstant ((uint) v);
446 else if (t == TypeManager.int64_type)
447 return new LongConstant ((long) v);
448 else if (t == TypeManager.uint64_type)
449 return new ULongConstant ((ulong) v);
450 else if (t == TypeManager.float_type)
451 return new FloatConstant ((float) v);
452 else if (t == TypeManager.double_type)
453 return new DoubleConstant ((double) v);
454 else if (t == TypeManager.string_type)
455 return new StringConstant ((string) v);
456 else if (t == TypeManager.short_type)
457 return new ShortConstant ((short)v);
458 else if (t == TypeManager.ushort_type)
459 return new UShortConstant ((ushort)v);
460 else if (t == TypeManager.sbyte_type)
461 return new SByteConstant (((sbyte)v));
462 else if (t == TypeManager.byte_type)
463 return new ByteConstant ((byte)v);
464 else if (t == TypeManager.char_type)
465 return new CharConstant ((char)v);
466 else if (t == TypeManager.bool_type)
467 return new BoolConstant ((bool) v);
468 else if (TypeManager.IsEnumType (t)){
469 Constant e = Constantify (v, TypeManager.TypeToCoreType (v.GetType ()));
470
471 return new EnumConstant (e, t);
472 } else
473 throw new Exception ("Unknown type for constant (" + t +
474 "), details: " + v);
475 }
476
477 /// <summary>
478 /// Returns a fully formed expression after a MemberLookup
479 /// </summary>
480 public static Expression ExprClassFromMemberInfo (EmitContext ec, MemberInfo mi, Location loc)
481 {
482 if (mi is EventInfo)
483 return new EventExpr ((EventInfo) mi, loc);
484 else if (mi is FieldInfo)
485 return new FieldExpr ((FieldInfo) mi, loc);
486 else if (mi is PropertyInfo)
487 return new PropertyExpr (ec, (PropertyInfo) mi, loc);
488 else if (mi is Type){
489 return new TypeExpression ((System.Type) mi, loc);
490 }
491
492 return null;
493 }
494
495 //
496 // FIXME: Probably implement a cache for (t,name,current_access_set)?
497 //
498 // This code could use some optimizations, but we need to do some
499 // measurements. For example, we could use a delegate to `flag' when
500 // something can not any longer be a method-group (because it is something
501 // else).
502 //
503 // Return values:
504 // If the return value is an Array, then it is an array of
505 // MethodBases
506 //
507 // If the return value is an MemberInfo, it is anything, but a Method
508 //
509 // null on error.
510 //
511 // FIXME: When calling MemberLookup inside an `Invocation', we should pass
512 // the arguments here and have MemberLookup return only the methods that
513 // match the argument count/type, unlike we are doing now (we delay this
514 // decision).
515 //
516 // This is so we can catch correctly attempts to invoke instance methods
517 // from a static body (scan for error 120 in ResolveSimpleName).
518 //
519 //
520 // FIXME: Potential optimization, have a static ArrayList
521 //
522
523 public static Expression MemberLookup (EmitContext ec, Type queried_type, string name,
524 MemberTypes mt, BindingFlags bf, Location loc)
525 {
526 return MemberLookup (ec, ec.ContainerType, null, queried_type, name, mt, bf, loc);
527 }
528
529 //
530 // Lookup type `queried_type' for code in class `container_type' with a qualifier of
531 // `qualifier_type' or null to lookup members in the current class.
532 //
533
534 public static Expression MemberLookup (EmitContext ec, Type container_type,
535 Type qualifier_type, Type queried_type,
536 string name, MemberTypes mt,
537 BindingFlags bf, Location loc)
538 {
539 MemberInfo [] mi = TypeManager.MemberLookup (container_type, qualifier_type,
540 queried_type, mt, bf, name);
541
542 if (mi == null)
543 return null;
544
545 int count = mi.Length;
546
547 if (mi [0] is MethodBase)
548 return new MethodGroupExpr (mi, loc);
549
550 if (count > 1)
551 return null;
552
553 return ExprClassFromMemberInfo (ec, mi [0], loc);
554 }
555
556 public const MemberTypes AllMemberTypes =
557 MemberTypes.Constructor |
558 MemberTypes.Event |
559 MemberTypes.Field |
560 MemberTypes.Method |
561 MemberTypes.NestedType |
562 MemberTypes.Property;
563
564 public const BindingFlags AllBindingFlags =
565 BindingFlags.Public |
566 BindingFlags.Static |
567 BindingFlags.Instance;
568
569 public static Expression MemberLookup (EmitContext ec, Type queried_type,
570 string name, Location loc)
571 {
572 return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
573 AllMemberTypes, AllBindingFlags, loc);
574 }
575
576 public static Expression MemberLookup (EmitContext ec, Type qualifier_type,
577 Type queried_type, string name, Location loc)
578 {
579 return MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type,
580 name, AllMemberTypes, AllBindingFlags, loc);
581 }
582
583 public static Expression MethodLookup (EmitContext ec, Type queried_type,
584 string name, Location loc)
585 {
586 return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
587 MemberTypes.Method, AllBindingFlags, loc);
588 }
589
590 /// <summary>
591 /// This is a wrapper for MemberLookup that is not used to "probe", but
592 /// to find a final definition. If the final definition is not found, we
593 /// look for private members and display a useful debugging message if we
594 /// find it.
595 /// </summary>
596 public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
597 Type queried_type, string name, Location loc)
598 {
599 return MemberLookupFinal (ec, qualifier_type, queried_type, name,
600 AllMemberTypes, AllBindingFlags, loc);
601 }
602
603 public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
604 Type queried_type, string name,
605 MemberTypes mt, BindingFlags bf,
606 Location loc)
607 {
608 Expression e;
609
610 int errors = Report.Errors;
611
612 e = MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type,
613 name, mt, bf, loc);
614
615 if (e != null)
616 return e;
617
618 // Error has already been reported.
619 if (errors < Report.Errors)
620 return null;
621
622 MemberLookupFailed (ec, qualifier_type, queried_type, name, null, loc);
623 return null;
624 }
625
626 public static void MemberLookupFailed (EmitContext ec, Type qualifier_type,
627 Type queried_type, string name,
628 string class_name, Location loc)
629 {
630 object lookup = TypeManager.MemberLookup (queried_type, null, queried_type,
631 AllMemberTypes, AllBindingFlags |
632 BindingFlags.NonPublic, name);
633
634 if (lookup == null) {
635 if (class_name != null)
636 Report.Error (103, loc, "The name `" + name + "' could not be " +
637 "found in `" + class_name + "'");
638 else
639 Report.Error (
640 117, loc, "`" + queried_type + "' does not contain a " +
641 "definition for `" + name + "'");
642 return;
643 }
644
645 if ((qualifier_type != null) && (qualifier_type != ec.ContainerType) &&
646 ec.ContainerType.IsSubclassOf (qualifier_type)) {
647 // Although a derived class can access protected members of
648 // its base class it cannot do so through an instance of the
649 // base class (CS1540). If the qualifier_type is a parent of the
650 // ec.ContainerType and the lookup succeeds with the latter one,
651 // then we are in this situation.
652
653 lookup = TypeManager.MemberLookup (
654 ec.ContainerType, ec.ContainerType, ec.ContainerType,
655 AllMemberTypes, AllBindingFlags, name);
656
657 if (lookup != null) {
658 Report.Error (
659 1540, loc, "Cannot access protected member `" +
660 TypeManager.CSharpName (qualifier_type) + "." +
661 name + "' " + "via a qualifier of type `" +
662 TypeManager.CSharpName (qualifier_type) + "'; the " +
663 "qualifier must be of type `" +
664 TypeManager.CSharpName (ec.ContainerType) + "' " +
665 "(or derived from it)");
666 return;
667 }
668 }
669
670 if (qualifier_type != null)
671 Report.Error (
672 122, loc, "`" + TypeManager.CSharpName (qualifier_type) + "." +
673 name + "' is inaccessible due to its protection level");
674 else if (name == ".ctor") {
675 Report.Error (143, loc, String.Format ("The type {0} has no constructors defined",
676 TypeManager.CSharpName (queried_type)));
677 } else {
678 Report.Error (
679 122, loc, "`" + name + "' is inaccessible due to its " +
680 "protection level");
681 }
682 }
683
684 static public MemberInfo GetFieldFromEvent (EventExpr event_expr)
685 {
686 EventInfo ei = event_expr.EventInfo;
687
688 return TypeManager.GetPrivateFieldOfEvent (ei);
689 }
690
691 /// <summary>
692 /// Returns an expression that can be used to invoke operator true
693 /// on the expression if it exists.
694 /// </summary>
695 static public StaticCallExpr GetOperatorTrue (EmitContext ec, Expression e, Location loc)
696 {
697 return GetOperatorTrueOrFalse (ec, e, true, loc);
698 }
699
700 /// <summary>
701 /// Returns an expression that can be used to invoke operator false
702 /// on the expression if it exists.
703 /// </summary>
704 static public StaticCallExpr GetOperatorFalse (EmitContext ec, Expression e, Location loc)
705 {
706 return GetOperatorTrueOrFalse (ec, e, false, loc);
707 }
708
709 static StaticCallExpr GetOperatorTrueOrFalse (EmitContext ec, Expression e, bool is_true, Location loc)
710 {
711 MethodBase method;
712 Expression operator_group;
713
714 operator_group = MethodLookup (ec, e.Type, is_true ? "op_True" : "op_False", loc);
715 if (operator_group == null)
716 return null;
717
718 ArrayList arguments = new ArrayList ();
719 arguments.Add (new Argument (e, Argument.AType.Expression));
720 method = Invocation.OverloadResolve (ec, (MethodGroupExpr) operator_group, arguments, loc);
721
722 if (method == null)
723 return null;
724
725 return new StaticCallExpr ((MethodInfo) method, arguments, loc);
726 }
727
728 /// <summary>
729 /// Resolves the expression `e' into a boolean expression: either through
730 /// an implicit conversion, or through an `operator true' invocation
731 /// </summary>
732 public static Expression ResolveBoolean (EmitContext ec, Expression e, Location loc)
733 {
734 e = e.Resolve (ec);
735 if (e == null)
736 return null;
737
738 Expression converted = e;
739 if (e.Type != TypeManager.bool_type)
740 converted = Convert.ImplicitConversion (ec, e, TypeManager.bool_type, new Location (-1));
741
742 //
743 // If no implicit conversion to bool exists, try using `operator true'
744 //
745 if (converted == null){
746 Expression operator_true = Expression.GetOperatorTrue (ec, e, loc);
747 if (operator_true == null){
748 Report.Error (
749 31, loc, "Can not convert the expression to a boolean");
750 return null;
751 }
752 e = operator_true;
753 } else
754 e = converted;
755
756 return e;
757 }
758
759 static string ExprClassName (ExprClass c)
760 {
761 switch (c){
762 case ExprClass.Invalid:
763 return "Invalid";
764 case ExprClass.Value:
765 return "value";
766 case ExprClass.Variable:
767 return "variable";
768 case ExprClass.Namespace:
769 return "namespace";
770 case ExprClass.Type:
771 return "type";
772 case ExprClass.MethodGroup:
773 return "method group";
774 case ExprClass.PropertyAccess:
775 return "property access";
776 case ExprClass.EventAccess:
777 return "event access";
778 case ExprClass.IndexerAccess:
779 return "indexer access";
780 case ExprClass.Nothing:
781 return "null";
782 }
783 throw new Exception ("Should not happen");
784 }
785
786 /// <summary>
787 /// Reports that we were expecting `expr' to be of class `expected'
788 /// </summary>
789 public void Error_UnexpectedKind (string expected)
790 {
791 string kind = "Unknown";
792
793 kind = ExprClassName (eclass);
794
795 Error (118, "Expression denotes a `" + kind +
796 "' where a `" + expected + "' was expected");
797 }
798
799 public void Error_UnexpectedKind (ResolveFlags flags)
800 {
801 ArrayList valid = new ArrayList (10);
802
803 if ((flags & ResolveFlags.VariableOrValue) != 0) {
804 valid.Add ("variable");
805 valid.Add ("value");
806 }
807
808 if ((flags & ResolveFlags.Type) != 0)
809 valid.Add ("type");
810
811 if ((flags & ResolveFlags.MethodGroup) != 0)
812 valid.Add ("method group");
813
814 if ((flags & ResolveFlags.SimpleName) != 0)
815 valid.Add ("simple name");
816
817 if (valid.Count == 0)
818 valid.Add ("unknown");
819
820 StringBuilder sb = new StringBuilder ();
821 for (int i = 0; i < valid.Count; i++) {
822 if (i > 0)
823 sb.Append (", ");
824 else if (i == valid.Count)
825 sb.Append (" or ");
826 sb.Append (valid [i]);
827 }
828
829 string kind = ExprClassName (eclass);
830
831 Error (119, "Expression denotes a `" + kind + "' where " +
832 "a `" + sb.ToString () + "' was expected");
833 }
834
835 static public void Error_ConstantValueCannotBeConverted (Location l, string val, Type t)
836 {
837 Report.Error (31, l, "Constant value `" + val + "' cannot be converted to " +
838 TypeManager.CSharpName (t));
839 }
840
841 public static void UnsafeError (Location loc)
842 {
843 Report.Error (214, loc, "Pointers may only be used in an unsafe context");
844 }
845
846 /// <summary>
847 /// Converts the IntConstant, UIntConstant, LongConstant or
848 /// ULongConstant into the integral target_type. Notice
849 /// that we do not return an `Expression' we do return
850 /// a boxed integral type.
851 ///
852 /// FIXME: Since I added the new constants, we need to
853 /// also support conversions from CharConstant, ByteConstant,
854 /// SByteConstant, UShortConstant, ShortConstant
855 ///
856 /// This is used by the switch statement, so the domain
857 /// of work is restricted to the literals above, and the
858 /// targets are int32, uint32, char, byte, sbyte, ushort,
859 /// short, uint64 and int64
860 /// </summary>
861 public static object ConvertIntLiteral (Constant c, Type target_type, Location loc)
862 {
863 if (!Convert.ImplicitStandardConversionExists (c, target_type)){
864 Convert.Error_CannotImplicitConversion (loc, c.Type, target_type);
865 return null;
866 }
867
868 string s = "";
869
870 if (c.Type == target_type)
871 return ((Constant) c).GetValue ();
872
873 //
874 // Make into one of the literals we handle, we dont really care
875 // about this value as we will just return a few limited types
876 //
877 if (c is EnumConstant)
878 c = ((EnumConstant)c).WidenToCompilerConstant ();
879
880 if (c is IntConstant){
881 int v = ((IntConstant) c).Value;
882
883 if (target_type == TypeManager.uint32_type){
884 if (v >= 0)
885 return (uint) v;
886 } else if (target_type == TypeManager.char_type){
887 if (v >= Char.MinValue && v <= Char.MaxValue)
888 return (char) v;
889 } else if (target_type == TypeManager.byte_type){
890 if (v >= Byte.MinValue && v <= Byte.MaxValue)
891 return (byte) v;
892 } else if (target_type == TypeManager.sbyte_type){
893 if (v >= SByte.MinValue && v <= SByte.MaxValue)
894 return (sbyte) v;
895 } else if (target_type == TypeManager.short_type){
896 if (v >= Int16.MinValue && v <= UInt16.MaxValue)
897 return (short) v;
898 } else if (target_type == TypeManager.ushort_type){
899 if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
900 return (ushort) v;
901 } else if (target_type == TypeManager.int64_type)
902 return (long) v;
903 else if (target_type == TypeManager.uint64_type){
904 if (v > 0)
905 return (ulong) v;
906 }
907
908 s = v.ToString ();
909 } else if (c is UIntConstant){
910 uint v = ((UIntConstant) c).Value;
911
912 if (target_type == TypeManager.int32_type){
913 if (v <= Int32.MaxValue)
914 return (int) v;
915 } else if (target_type == TypeManager.char_type){
916 if (v >= Char.MinValue && v <= Char.MaxValue)
917 return (char) v;
918 } else if (target_type == TypeManager.byte_type){
919 if (v <= Byte.MaxValue)
920 return (byte) v;
921 } else if (target_type == TypeManager.sbyte_type){
922 if (v <= SByte.MaxValue)
923 return (sbyte) v;
924 } else if (target_type == TypeManager.short_type){
925 if (v <= UInt16.MaxValue)
926 return (short) v;
927 } else if (target_type == TypeManager.ushort_type){
928 if (v <= UInt16.MaxValue)
929 return (ushort) v;
930 } else if (target_type == TypeManager.int64_type)
931 return (long) v;
932 else if (target_type == TypeManager.uint64_type)
933 return (ulong) v;
934 s = v.ToString ();
935 } else if (c is LongConstant){
936 long v = ((LongConstant) c).Value;
937
938 if (target_type == TypeManager.int32_type){
939 if (v >= UInt32.MinValue && v <= UInt32.MaxValue)
940 return (int) v;
941 } else if (target_type == TypeManager.uint32_type){
942 if (v >= 0 && v <= UInt32.MaxValue)
943 return (uint) v;
944 } else if (target_type == TypeManager.char_type){
945 if (v >= Char.MinValue && v <= Char.MaxValue)
946 return (char) v;
947 } else if (target_type == TypeManager.byte_type){
948 if (v >= Byte.MinValue && v <= Byte.MaxValue)
949 return (byte) v;
950 } else if (target_type == TypeManager.sbyte_type){
951 if (v >= SByte.MinValue && v <= SByte.MaxValue)
952 return (sbyte) v;
953 } else if (target_type == TypeManager.short_type){
954 if (v >= Int16.MinValue && v <= UInt16.MaxValue)
955 return (short) v;
956 } else if (target_type == TypeManager.ushort_type){
957 if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
958 return (ushort) v;
959 } else if (target_type == TypeManager.uint64_type){
960 if (v > 0)
961 return (ulong) v;
962 }
963 s = v.ToString ();
964 } else if (c is ULongConstant){
965 ulong v = ((ULongConstant) c).Value;
966
967 if (target_type == TypeManager.int32_type){
968 if (v <= Int32.MaxValue)
969 return (int) v;
970 } else if (target_type == TypeManager.uint32_type){
971 if (v <= UInt32.MaxValue)
972 return (uint) v;
973 } else if (target_type == TypeManager.char_type){
974 if (v >= Char.MinValue && v <= Char.MaxValue)
975 return (char) v;
976 } else if (target_type == TypeManager.byte_type){
977 if (v >= Byte.MinValue && v <= Byte.MaxValue)
978 return (byte) v;
979 } else if (target_type == TypeManager.sbyte_type){
980 if (v <= (int) SByte.MaxValue)
981 return (sbyte) v;
982 } else if (target_type == TypeManager.short_type){
983 if (v <= UInt16.MaxValue)
984 return (short) v;
985 } else if (target_type == TypeManager.ushort_type){
986 if (v <= UInt16.MaxValue)
987 return (ushort) v;
988 } else if (target_type == TypeManager.int64_type){
989 if (v <= Int64.MaxValue)
990 return (long) v;
991 }
992 s = v.ToString ();
993 } else if (c is ByteConstant){
994 byte v = ((ByteConstant) c).Value;
995
996 if (target_type == TypeManager.int32_type)
997 return (int) v;
998 else if (target_type == TypeManager.uint32_type)
999 return (uint) v;
1000 else if (target_type == TypeManager.char_type)
1001 return (char) v;
1002 else if (target_type == TypeManager.sbyte_type){
1003 if (v <= SByte.MaxValue)
1004 return (sbyte) v;
1005 } else if (target_type == TypeManager.short_type)
1006 return (short) v;
1007 else if (target_type == TypeManager.ushort_type)
1008 return (ushort) v;
1009 else if (target_type == TypeManager.int64_type)
1010 return (long) v;
1011 else if (target_type == TypeManager.uint64_type)
1012 return (ulong) v;
1013 s = v.ToString ();
1014 } else if (c is SByteConstant){
1015 sbyte v = ((SByteConstant) c).Value;
1016
1017 if (target_type == TypeManager.int32_type)
1018 return (int) v;
1019 else if (target_type == TypeManager.uint32_type){
1020 if (v >= 0)
1021 return (uint) v;
1022 } else if (target_type == TypeManager.char_type){
1023 if (v >= 0)
1024 return (char) v;
1025 } else if (target_type == TypeManager.byte_type){
1026 if (v >= 0)
1027 return (byte) v;
1028 } else if (target_type == TypeManager.short_type)
1029 return (short) v;
1030 else if (target_type == TypeManager.ushort_type){
1031 if (v >= 0)
1032 return (ushort) v;
1033 } else if (target_type == TypeManager.int64_type)
1034 return (long) v;
1035 else if (target_type == TypeManager.uint64_type){
1036 if (v >= 0)
1037 return (ulong) v;
1038 }
1039 s = v.ToString ();
1040 } else if (c is ShortConstant){
1041 short v = ((ShortConstant) c).Value;
1042
1043 if (target_type == TypeManager.int32_type){
1044 return (int) v;
1045 } else if (target_type == TypeManager.uint32_type){
1046 if (v >= 0)
1047 return (uint) v;
1048 } else if (target_type == TypeManager.char_type){
1049 if (v >= 0)
1050 return (char) v;
1051 } else if (target_type == TypeManager.byte_type){
1052 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1053 return (byte) v;
1054 } else if (target_type == TypeManager.sbyte_type){
1055 if (v >= SByte.MinValue && v <= SByte.MaxValue)
1056 return (sbyte) v;
1057 } else if (target_type == TypeManager.ushort_type){
1058 if (v >= 0)
1059 return (ushort) v;
1060 } else if (target_type == TypeManager.int64_type)
1061 return (long) v;
1062 else if (target_type == TypeManager.uint64_type)
1063 return (ulong) v;
1064
1065 s = v.ToString ();
1066 } else if (c is UShortConstant){
1067 ushort v = ((UShortConstant) c).Value;
1068
1069 if (target_type == TypeManager.int32_type)
1070 return (int) v;
1071 else if (target_type == TypeManager.uint32_type)
1072 return (uint) v;
1073 else if (target_type == TypeManager.char_type){
1074 if (v >= Char.MinValue && v <= Char.MaxValue)
1075 return (char) v;
1076 } else if (target_type == TypeManager.byte_type){
1077 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1078 return (byte) v;
1079 } else if (target_type == TypeManager.sbyte_type){
1080 if (v <= SByte.MaxValue)
1081 return (byte) v;
1082 } else if (target_type == TypeManager.short_type){
1083 if (v <= Int16.MaxValue)
1084 return (short) v;
1085 } else if (target_type == TypeManager.int64_type)
1086 return (long) v;
1087 else if (target_type == TypeManager.uint64_type)
1088 return (ulong) v;
1089
1090 s = v.ToString ();
1091 } else if (c is CharConstant){
1092 char v = ((CharConstant) c).Value;
1093
1094 if (target_type == TypeManager.int32_type)
1095 return (int) v;
1096 else if (target_type == TypeManager.uint32_type)
1097 return (uint) v;
1098 else if (target_type == TypeManager.byte_type){
1099 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1100 return (byte) v;
1101 } else if (target_type == TypeManager.sbyte_type){
1102 if (v <= SByte.MaxValue)
1103 return (sbyte) v;
1104 } else if (target_type == TypeManager.short_type){
1105 if (v <= Int16.MaxValue)
1106 return (short) v;
1107 } else if (target_type == TypeManager.ushort_type)
1108 return (short) v;
1109 else if (target_type == TypeManager.int64_type)
1110 return (long) v;
1111 else if (target_type == TypeManager.uint64_type)
1112 return (ulong) v;
1113
1114 s = v.ToString ();
1115 }
1116 Error_ConstantValueCannotBeConverted (loc, s, target_type);
1117 return null;
1118 }
1119
1120 //
1121 // Load the object from the pointer.
1122 //
1123 public static void LoadFromPtr (ILGenerator ig, Type t)
1124 {
1125 if (t == TypeManager.int32_type)
1126 ig.Emit (OpCodes.Ldind_I4);
1127 else if (t == TypeManager.uint32_type)
1128 ig.Emit (OpCodes.Ldind_U4);
1129 else if (t == TypeManager.short_type)
1130 ig.Emit (OpCodes.Ldind_I2);
1131 else if (t == TypeManager.ushort_type)
1132 ig.Emit (OpCodes.Ldind_U2);
1133 else if (t == TypeManager.char_type)
1134 ig.Emit (OpCodes.Ldind_U2);
1135 else if (t == TypeManager.byte_type)
1136 ig.Emit (OpCodes.Ldind_U1);
1137 else if (t == TypeManager.sbyte_type)
1138 ig.Emit (OpCodes.Ldind_I1);
1139 else if (t == TypeManager.uint64_type)
1140 ig.Emit (OpCodes.Ldind_I8);
1141 else if (t == TypeManager.int64_type)
1142 ig.Emit (OpCodes.Ldind_I8);
1143 else if (t == TypeManager.float_type)
1144 ig.Emit (OpCodes.Ldind_R4);
1145 else if (t == TypeManager.double_type)
1146 ig.Emit (OpCodes.Ldind_R8);
1147 else if (t == TypeManager.bool_type)
1148 ig.Emit (OpCodes.Ldind_I1);
1149 else if (t == TypeManager.intptr_type)
1150 ig.Emit (OpCodes.Ldind_I);
1151 else if (TypeManager.IsEnumType (t)) {
1152 if (t == TypeManager.enum_type)
1153 ig.Emit (OpCodes.Ldind_Ref);
1154 else
1155 LoadFromPtr (ig, TypeManager.EnumToUnderlying (t));
1156 } else if (t.IsValueType)
1157 ig.Emit (OpCodes.Ldobj, t);
1158 else if (t.IsPointer)
1159 ig.Emit (OpCodes.Ldind_I);
1160 else
1161 ig.Emit (OpCodes.Ldind_Ref);
1162 }
1163
1164 //
1165 // The stack contains the pointer and the value of type `type'
1166 //
1167 public static void StoreFromPtr (ILGenerator ig, Type type)
1168 {
1169 if (TypeManager.IsEnumType (type))
1170 type = TypeManager.EnumToUnderlying (type);
1171 if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
1172 ig.Emit (OpCodes.Stind_I4);
1173 else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
1174 ig.Emit (OpCodes.Stind_I8);
1175 else if (type == TypeManager.char_type || type == TypeManager.short_type ||
1176 type == TypeManager.ushort_type)
1177 ig.Emit (OpCodes.Stind_I2);
1178 else if (type == TypeManager.float_type)
1179 ig.Emit (OpCodes.Stind_R4);
1180 else if (type == TypeManager.double_type)
1181 ig.Emit (OpCodes.Stind_R8);
1182 else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
1183 type == TypeManager.bool_type)
1184 ig.Emit (OpCodes.Stind_I1);
1185 else if (type == TypeManager.intptr_type)
1186 ig.Emit (OpCodes.Stind_I);
1187 else if (type.IsValueType)
1188 ig.Emit (OpCodes.Stobj, type);
1189 else
1190 ig.Emit (OpCodes.Stind_Ref);
1191 }
1192
1193 //
1194 // Returns the size of type `t' if known, otherwise, 0
1195 //
1196 public static int GetTypeSize (Type t)
1197 {
1198 t = TypeManager.TypeToCoreType (t);
1199 if (t == TypeManager.int32_type ||
1200 t == TypeManager.uint32_type ||
1201 t == TypeManager.float_type)
1202 return 4;
1203 else if (t == TypeManager.int64_type ||
1204 t == TypeManager.uint64_type ||
1205 t == TypeManager.double_type)
1206 return 8;
1207 else if (t == TypeManager.byte_type ||
1208 t == TypeManager.sbyte_type ||
1209 t == TypeManager.bool_type)
1210 return 1;
1211 else if (t == TypeManager.short_type ||
1212 t == TypeManager.char_type ||
1213 t == TypeManager.ushort_type)
1214 return 2;
1215 else if (t == TypeManager.decimal_type)
1216 return 16;
1217 else
1218 return 0;
1219 }
1220
1221 //
1222 // Default implementation of IAssignMethod.CacheTemporaries
1223 //
1224 public void CacheTemporaries (EmitContext ec)
1225 {
1226 }
1227
1228 static void Error_NegativeArrayIndex (Location loc)
1229 {
1230 Report.Error (284, loc, "Can not create array with a negative size");
1231 }
1232
1233 //
1234 // Converts `source' to an int, uint, long or ulong.
1235 //
1236 public Expression ExpressionToArrayArgument (EmitContext ec, Expression source, Location loc)
1237 {
1238 Expression target;
1239
1240 bool old_checked = ec.CheckState;
1241 ec.CheckState = true;
1242
1243 target = Convert.ImplicitConversion (ec, source, TypeManager.int32_type, loc);
1244 if (target == null){
1245 target = Convert.ImplicitConversion (ec, source, TypeManager.uint32_type, loc);
1246 if (target == null){
1247 target = Convert.ImplicitConversion (ec, source, TypeManager.int64_type, loc);
1248 if (target == null){
1249 target = Convert.ImplicitConversion (ec, source, TypeManager.uint64_type, loc);
1250 if (target == null)
1251 Convert.Error_CannotImplicitConversion (loc, source.Type, TypeManager.int32_type);
1252 }
1253 }
1254 }
1255 ec.CheckState = old_checked;
1256
1257 //
1258 // Only positive constants are allowed at compile time
1259 //
1260 if (target is Constant){
1261 if (target is IntConstant){
1262 if (((IntConstant) target).Value < 0){
1263 Error_NegativeArrayIndex (loc);
1264 return null;
1265 }
1266 }
1267
1268 if (target is LongConstant){
1269 if (((LongConstant) target).Value < 0){
1270 Error_NegativeArrayIndex (loc);
1271 return null;
1272 }
1273 }
1274
1275 }
1276
1277 return target;
1278 }
1279
1280 }
1281
1282 /// <summary>
1283 /// This is just a base class for expressions that can
1284 /// appear on statements (invocations, object creation,
1285 /// assignments, post/pre increment and decrement). The idea
1286 /// being that they would support an extra Emition interface that
1287 /// does not leave a result on the stack.
1288 /// </summary>
1289 public abstract class ExpressionStatement : Expression {
1290
1291 public virtual ExpressionStatement ResolveStatement (EmitContext ec)
1292 {
1293 Expression e = Resolve (ec);
1294 if (e == null)
1295 return null;
1296
1297 ExpressionStatement es = e as ExpressionStatement;
1298 if (es == null)
1299 Error (201, "Only assignment, call, increment, decrement and new object " +
1300 "expressions can be used as a statement");
1301
1302 return es;
1303 }
1304
1305 /// <summary>
1306 /// Requests the expression to be emitted in a `statement'
1307 /// context. This means that no new value is left on the
1308 /// stack after invoking this method (constrasted with
1309 /// Emit that will always leave a value on the stack).
1310 /// </summary>
1311 public abstract void EmitStatement (EmitContext ec);
1312 }
1313
1314 /// <summary>
1315 /// This kind of cast is used to encapsulate the child
1316 /// whose type is child.Type into an expression that is
1317 /// reported to return "return_type". This is used to encapsulate
1318 /// expressions which have compatible types, but need to be dealt
1319 /// at higher levels with.
1320 ///
1321 /// For example, a "byte" expression could be encapsulated in one
1322 /// of these as an "unsigned int". The type for the expression
1323 /// would be "unsigned int".
1324 ///
1325 /// </summary>
1326 public class EmptyCast : Expression {
1327 protected Expression child;
1328
1329 public Expression Child {
1330 get {
1331 return child;
1332 }
1333 }
1334
1335 public EmptyCast (Expression child, Type return_type)
1336 {
1337 eclass = child.eclass;
1338 type = return_type;
1339 this.child = child;
1340 }
1341
1342 public override Expression DoResolve (EmitContext ec)
1343 {
1344 // This should never be invoked, we are born in fully
1345 // initialized state.
1346
1347 return this;
1348 }
1349
1350 public override void Emit (EmitContext ec)
1351 {
1352 child.Emit (ec);
1353 }
1354 }
1355
1356 //
1357 // We need to special case this since an empty cast of
1358 // a NullLiteral is still a Constant
1359 //
1360 public class NullCast : Constant {
1361 protected Expression child;
1362
1363 public NullCast (Expression child, Type return_type)
1364 {
1365 eclass = child.eclass;
1366 type = return_type;
1367 this.child = child;
1368 }
1369
1370 override public string AsString ()
1371 {
1372 return "null";
1373 }
1374
1375 public override object GetValue ()
1376 {
1377 return null;
1378 }
1379
1380 public override Expression DoResolve (EmitContext ec)
1381 {
1382 // This should never be invoked, we are born in fully
1383 // initialized state.
1384
1385 return this;
1386 }
1387
1388 public override void Emit (EmitContext ec)
1389 {
1390 child.Emit (ec);
1391 }
1392 }
1393
1394
1395 /// <summary>
1396 /// This class is used to wrap literals which belong inside Enums
1397 /// </summary>
1398 public class EnumConstant : Constant {
1399 public Constant Child;
1400
1401 public EnumConstant (Constant child, Type enum_type)
1402 {
1403 eclass = child.eclass;
1404 this.Child = child;
1405 type = enum_type;
1406 }
1407
1408 public override Expression DoResolve (EmitContext ec)
1409 {
1410 // This should never be invoked, we are born in fully
1411 // initialized state.
1412
1413 return this;
1414 }
1415
1416 public override void Emit (EmitContext ec)
1417 {
1418 Child.Emit (ec);
1419 }
1420
1421 public override object GetValue ()
1422 {
1423 return Child.GetValue ();
1424 }
1425
1426 //
1427 // Converts from one of the valid underlying types for an enumeration
1428 // (int32, uint32, int64, uint64, short, ushort, byte, sbyte) to
1429 // one of the internal compiler literals: Int/UInt/Long/ULong Literals.
1430 //
1431 public Constant WidenToCompilerConstant ()
1432 {
1433 Type t = TypeManager.EnumToUnderlying (Child.Type);
1434 object v = ((Constant) Child).GetValue ();;
1435
1436 if (t == TypeManager.int32_type)
1437 return new IntConstant ((int) v);
1438 if (t == TypeManager.uint32_type)
1439 return new UIntConstant ((uint) v);
1440 if (t == TypeManager.int64_type)
1441 return new LongConstant ((long) v);
1442 if (t == TypeManager.uint64_type)
1443 return new ULongConstant ((ulong) v);
1444 if (t == TypeManager.short_type)
1445 return new ShortConstant ((short) v);
1446 if (t == TypeManager.ushort_type)
1447 return new UShortConstant ((ushort) v);
1448 if (t == TypeManager.byte_type)
1449 return new ByteConstant ((byte) v);
1450 if (t == TypeManager.sbyte_type)
1451 return new SByteConstant ((sbyte) v);
1452
1453 throw new Exception ("Invalid enumeration underlying type: " + t);
1454 }
1455
1456 //
1457 // Extracts the value in the enumeration on its native representation
1458 //
1459 public object GetPlainValue ()
1460 {
1461 Type t = TypeManager.EnumToUnderlying (Child.Type);
1462 object v = ((Constant) Child).GetValue ();;
1463
1464 if (t == TypeManager.int32_type)
1465 return (int) v;
1466 if (t == TypeManager.uint32_type)
1467 return (uint) v;
1468 if (t == TypeManager.int64_type)
1469 return (long) v;
1470 if (t == TypeManager.uint64_type)
1471 return (ulong) v;
1472 if (t == TypeManager.short_type)
1473 return (short) v;
1474 if (t == TypeManager.ushort_type)
1475 return (ushort) v;
1476 if (t == TypeManager.byte_type)
1477 return (byte) v;
1478 if (t == TypeManager.sbyte_type)
1479 return (sbyte) v;
1480
1481 return null;
1482 }
1483
1484 public override string AsString ()
1485 {
1486 return Child.AsString ();
1487 }
1488
1489 public override DoubleConstant ConvertToDouble ()
1490 {
1491 return Child.ConvertToDouble ();
1492 }
1493
1494 public override FloatConstant ConvertToFloat ()
1495 {
1496 return Child.ConvertToFloat ();
1497 }
1498
1499 public override ULongConstant ConvertToULong ()
1500 {
1501 return Child.ConvertToULong ();
1502 }
1503
1504 public override LongConstant ConvertToLong ()
1505 {
1506 return Child.ConvertToLong ();
1507 }
1508
1509 public override UIntConstant ConvertToUInt ()
1510 {
1511 return Child.ConvertToUInt ();
1512 }
1513
1514 public override IntConstant ConvertToInt ()
1515 {
1516 return Child.ConvertToInt ();
1517 }
1518
1519 public override bool IsZeroInteger {
1520 get { return Child.IsZeroInteger; }
1521 }
1522 }
1523
1524 /// <summary>
1525 /// This kind of cast is used to encapsulate Value Types in objects.
1526 ///
1527 /// The effect of it is to box the value type emitted by the previous
1528 /// operation.
1529 /// </summary>
1530 public class BoxedCast : EmptyCast {
1531
1532 public BoxedCast (Expression expr)
1533 : base (expr, TypeManager.object_type)
1534 {
1535 }
1536
1537 public BoxedCast (Expression expr, Type target_type)
1538 : base (expr, target_type)
1539 {
1540 }
1541
1542 public override Expression DoResolve (EmitContext ec)
1543 {
1544 // This should never be invoked, we are born in fully
1545 // initialized state.
1546
1547 return this;
1548 }
1549
1550 public override void Emit (EmitContext ec)
1551 {
1552 base.Emit (ec);
1553
1554 ec.ig.Emit (OpCodes.Box, child.Type);
1555 }
1556 }
1557
1558 public class UnboxCast : EmptyCast {
1559 public UnboxCast (Expression expr, Type return_type)
1560 : base (expr, return_type)
1561 {
1562 }
1563
1564 public override Expression DoResolve (EmitContext ec)
1565 {
1566 // This should never be invoked, we are born in fully
1567 // initialized state.
1568
1569 return this;
1570 }
1571
1572 public override void Emit (EmitContext ec)
1573 {
1574 Type t = type;
1575 ILGenerator ig = ec.ig;
1576
1577 base.Emit (ec);
1578 ig.Emit (OpCodes.Unbox, t);
1579
1580 LoadFromPtr (ig, t);
1581 }
1582 }
1583
1584 /// <summary>
1585 /// This is used to perform explicit numeric conversions.
1586 ///
1587 /// Explicit numeric conversions might trigger exceptions in a checked
1588 /// context, so they should generate the conv.ovf opcodes instead of
1589 /// conv opcodes.
1590 /// </summary>
1591 public class ConvCast : EmptyCast {
1592 public enum Mode : byte {
1593 I1_U1, I1_U2, I1_U4, I1_U8, I1_CH,
1594 U1_I1, U1_CH,
1595 I2_I1, I2_U1, I2_U2, I2_U4, I2_U8, I2_CH,
1596 U2_I1, U2_U1, U2_I2, U2_CH,
1597 I4_I1, I4_U1, I4_I2, I4_U2, I4_U4, I4_U8, I4_CH,
1598 U4_I1, U4_U1, U4_I2, U4_U2, U4_I4, U4_CH,
1599 I8_I1, I8_U1, I8_I2, I8_U2, I8_I4, I8_U4, I8_U8, I8_CH,
1600 U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH,
1601 CH_I1, CH_U1, CH_I2,
1602 R4_I1, R4_U1, R4_I2, R4_U2, R4_I4, R4_U4, R4_I8, R4_U8, R4_CH,
1603 R8_I1, R8_U1, R8_I2, R8_U2, R8_I4, R8_U4, R8_I8, R8_U8, R8_CH, R8_R4
1604 }
1605
1606 Mode mode;
1607 bool checked_state;
1608
1609 public ConvCast (EmitContext ec, Expression child, Type return_type, Mode m)
1610 : base (child, return_type)
1611 {
1612 checked_state = ec.CheckState;
1613 mode = m;
1614 }
1615
1616 public override Expression DoResolve (EmitContext ec)
1617 {
1618 // This should never be invoked, we are born in fully
1619 // initialized state.
1620
1621 return this;
1622 }
1623
1624 public override string ToString ()
1625 {
1626 return String.Format ("ConvCast ({0}, {1})", mode, child);
1627 }
1628
1629 public override void Emit (EmitContext ec)
1630 {
1631 ILGenerator ig = ec.ig;
1632
1633 base.Emit (ec);
1634
1635 if (checked_state){
1636 switch (mode){
1637 case Mode.I1_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1638 case Mode.I1_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1639 case Mode.I1_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1640 case Mode.I1_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1641 case Mode.I1_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1642
1643 case Mode.U1_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1644 case Mode.U1_CH: /* nothing */ break;
1645
1646 case Mode.I2_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1647 case Mode.I2_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1648 case Mode.I2_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1649 case Mode.I2_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1650 case Mode.I2_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1651 case Mode.I2_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1652
1653 case Mode.U2_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1654 case Mode.U2_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
1655 case Mode.U2_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
1656 case Mode.U2_CH: /* nothing */ break;
1657
1658 case Mode.I4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1659 case Mode.I4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1660 case Mode.I4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
1661 case Mode.I4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1662 case Mode.I4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1663 case Mode.I4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1664 case Mode.I4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1665
1666 case Mode.U4_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1667 case Mode.U4_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
1668 case Mode.U4_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
1669 case Mode.U4_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
1670 case Mode.U4_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
1671 case Mode.U4_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
1672
1673 case Mode.I8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1674 case Mode.I8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1675 case Mode.I8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
1676 case Mode.I8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1677 case Mode.I8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
1678 case Mode.I8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1679 case Mode.I8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1680 case Mode.I8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1681
1682 case Mode.U8_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1683 case Mode.U8_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
1684 case Mode.U8_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
1685 case Mode.U8_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
1686 case Mode.U8_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
1687 case Mode.U8_U4: ig.Emit (OpCodes.Conv_Ovf_U4_Un); break;
1688 case Mode.U8_I8: ig.Emit (OpCodes.Conv_Ovf_I8_Un); break;
1689 case Mode.U8_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
1690
1691 case Mode.CH_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1692 case Mode.CH_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
1693 case Mode.CH_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
1694
1695 case Mode.R4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1696 case Mode.R4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1697 case Mode.R4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
1698 case Mode.R4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1699 case Mode.R4_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
1700 case Mode.R4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1701 case Mode.R4_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
1702 case Mode.R4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1703 case Mode.R4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1704
1705 case Mode.R8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1706 case Mode.R8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1707 case Mode.R8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
1708 case Mode.R8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1709 case Mode.R8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
1710 case Mode.R8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1711 case Mode.R8_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
1712 case Mode.R8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1713 case Mode.R8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1714 case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
1715 }
1716 } else {
1717 switch (mode){
1718 case Mode.I1_U1: ig.Emit (OpCodes.Conv_U1); break;
1719 case Mode.I1_U2: ig.Emit (OpCodes.Conv_U2); break;
1720 case Mode.I1_U4: ig.Emit (OpCodes.Conv_U4); break;
1721 case Mode.I1_U8: ig.Emit (OpCodes.Conv_I8); break;
1722 case Mode.I1_CH: ig.Emit (OpCodes.Conv_U2); break;
1723
1724 case Mode.U1_I1: ig.Emit (OpCodes.Conv_I1); break;
1725 case Mode.U1_CH: ig.Emit (OpCodes.Conv_U2); break;
1726
1727 case Mode.I2_I1: ig.Emit (OpCodes.Conv_I1); break;
1728 case Mode.I2_U1: ig.Emit (OpCodes.Conv_U1); break;
1729 case Mode.I2_U2: ig.Emit (OpCodes.Conv_U2); break;
1730 case Mode.I2_U4: ig.Emit (OpCodes.Conv_U4); break;
1731 case Mode.I2_U8: ig.Emit (OpCodes.Conv_I8); break;
1732 case Mode.I2_CH: ig.Emit (OpCodes.Conv_U2); break;
1733
1734 case Mode.U2_I1: ig.Emit (OpCodes.Conv_I1); break;
1735 case Mode.U2_U1: ig.Emit (OpCodes.Conv_U1); break;
1736 case Mode.U2_I2: ig.Emit (OpCodes.Conv_I2); break;
1737 case Mode.U2_CH: /* nothing */ break;
1738
1739 case Mode.I4_I1: ig.Emit (OpCodes.Conv_I1); break;
1740 case Mode.I4_U1: ig.Emit (OpCodes.Conv_U1); break;
1741 case Mode.I4_I2: ig.Emit (OpCodes.Conv_I2); break;
1742 case Mode.I4_U4: /* nothing */ break;
1743 case Mode.I4_U2: ig.Emit (OpCodes.Conv_U2); break;
1744 case Mode.I4_U8: ig.Emit (OpCodes.Conv_I8); break;
1745 case Mode.I4_CH: ig.Emit (OpCodes.Conv_U2); break;
1746
1747 case Mode.U4_I1: ig.Emit (OpCodes.Conv_I1); break;
1748 case Mode.U4_U1: ig.Emit (OpCodes.Conv_U1); break;
1749 case Mode.U4_I2: ig.Emit (OpCodes.Conv_I2); break;
1750 case Mode.U4_U2: ig.Emit (OpCodes.Conv_U2); break;
1751 case Mode.U4_I4: /* nothing */ break;
1752 case Mode.U4_CH: ig.Emit (OpCodes.Conv_U2); break;
1753
1754 case Mode.I8_I1: ig.Emit (OpCodes.Conv_I1); break;
1755 case Mode.I8_U1: ig.Emit (OpCodes.Conv_U1); break;
1756 case Mode.I8_I2: ig.Emit (OpCodes.Conv_I2); break;
1757 case Mode.I8_U2: ig.Emit (OpCodes.Conv_U2); break;
1758 case Mode.I8_I4: ig.Emit (OpCodes.Conv_I4); break;
1759 case Mode.I8_U4: ig.Emit (OpCodes.Conv_U4); break;
1760 case Mode.I8_U8: /* nothing */ break;
1761 case Mode.I8_CH: ig.Emit (OpCodes.Conv_U2); break;
1762
1763 case Mode.U8_I1: ig.Emit (OpCodes.Conv_I1); break;
1764 case Mode.U8_U1: ig.Emit (OpCodes.Conv_U1); break;
1765 case Mode.U8_I2: ig.Emit (OpCodes.Conv_I2); break;
1766 case Mode.U8_U2: ig.Emit (OpCodes.Conv_U2); break;
1767 case Mode.U8_I4: ig.Emit (OpCodes.Conv_I4); break;
1768 case Mode.U8_U4: ig.Emit (OpCodes.Conv_U4); break;
1769 case Mode.U8_I8: /* nothing */ break;
1770 case Mode.U8_CH: ig.Emit (OpCodes.Conv_U2); break;
1771
1772 case Mode.CH_I1: ig.Emit (OpCodes.Conv_I1); break;
1773 case Mode.CH_U1: ig.Emit (OpCodes.Conv_U1); break;
1774 case Mode.CH_I2: ig.Emit (OpCodes.Conv_I2); break;
1775
1776 case Mode.R4_I1: ig.Emit (OpCodes.Conv_I1); break;
1777 case Mode.R4_U1: ig.Emit (OpCodes.Conv_U1); break;
1778 case Mode.R4_I2: ig.Emit (OpCodes.Conv_I2); break;
1779 case Mode.R4_U2: ig.Emit (OpCodes.Conv_U2); break;
1780 case Mode.R4_I4: ig.Emit (OpCodes.Conv_I4); break;
1781 case Mode.R4_U4: ig.Emit (OpCodes.Conv_U4); break;
1782 case Mode.R4_I8: ig.Emit (OpCodes.Conv_I8); break;
1783 case Mode.R4_U8: ig.Emit (OpCodes.Conv_U8); break;
1784 case Mode.R4_CH: ig.Emit (OpCodes.Conv_U2); break;
1785
1786 case Mode.R8_I1: ig.Emit (OpCodes.Conv_I1); break;
1787 case Mode.R8_U1: ig.Emit (OpCodes.Conv_U1); break;
1788 case Mode.R8_I2: ig.Emit (OpCodes.Conv_I2); break;
1789 case Mode.R8_U2: ig.Emit (OpCodes.Conv_U2); break;
1790 case Mode.R8_I4: ig.Emit (OpCodes.Conv_I4); break;
1791 case Mode.R8_U4: ig.Emit (OpCodes.Conv_U4); break;
1792 case Mode.R8_I8: ig.Emit (OpCodes.Conv_I8); break;
1793 case Mode.R8_U8: ig.Emit (OpCodes.Conv_U8); break;
1794 case Mode.R8_CH: ig.Emit (OpCodes.Conv_U2); break;
1795 case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
1796 }
1797 }
1798 }
1799 }
1800
1801 public class OpcodeCast : EmptyCast {
1802 OpCode op, op2;
1803 bool second_valid;
1804
1805 public OpcodeCast (Expression child, Type return_type, OpCode op)
1806 : base (child, return_type)
1807
1808 {
1809 this.op = op;
1810 second_valid = false;
1811 }
1812
1813 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
1814 : base (child, return_type)
1815
1816 {
1817 this.op = op;
1818 this.op2 = op2;
1819 second_valid = true;
1820 }
1821
1822 public override Expression DoResolve (EmitContext ec)
1823 {
1824 // This should never be invoked, we are born in fully
1825 // initialized state.
1826
1827 return this;
1828 }
1829
1830 public override void Emit (EmitContext ec)
1831 {
1832 base.Emit (ec);
1833 ec.ig.Emit (op);
1834
1835 if (second_valid)
1836 ec.ig.Emit (op2);
1837 }
1838 }
1839
1840 /// <summary>
1841 /// This kind of cast is used to encapsulate a child and cast it
1842 /// to the class requested
1843 /// </summary>
1844 public class ClassCast : EmptyCast {
1845 public ClassCast (Expression child, Type return_type)
1846 : base (child, return_type)
1847
1848 {
1849 }
1850
1851 public override Expression DoResolve (EmitContext ec)
1852 {
1853 // This should never be invoked, we are born in fully
1854 // initialized state.
1855
1856 return this;
1857 }
1858
1859 public override void Emit (EmitContext ec)
1860 {
1861 base.Emit (ec);
1862
1863 ec.ig.Emit (OpCodes.Castclass, type);
1864 }
1865
1866 }
1867
1868 /// <summary>
1869 /// SimpleName expressions are initially formed of a single
1870 /// word and it only happens at the beginning of the expression.
1871 /// </summary>
1872 ///
1873 /// <remarks>
1874 /// The expression will try to be bound to a Field, a Method
1875 /// group or a Property. If those fail we pass the name to our
1876 /// caller and the SimpleName is compounded to perform a type
1877 /// lookup. The idea behind this process is that we want to avoid
1878 /// creating a namespace map from the assemblies, as that requires
1879 /// the GetExportedTypes function to be called and a hashtable to
1880 /// be constructed which reduces startup time. If later we find
1881 /// that this is slower, we should create a `NamespaceExpr' expression
1882 /// that fully participates in the resolution process.
1883 ///
1884 /// For example `System.Console.WriteLine' is decomposed into
1885 /// MemberAccess (MemberAccess (SimpleName ("System"), "Console"), "WriteLine")
1886 ///
1887 /// The first SimpleName wont produce a match on its own, so it will
1888 /// be turned into:
1889 /// MemberAccess (SimpleName ("System.Console"), "WriteLine").
1890 ///
1891 /// System.Console will produce a TypeExpr match.
1892 ///
1893 /// The downside of this is that we might be hitting `LookupType' too many
1894 /// times with this scheme.
1895 /// </remarks>
1896 public class SimpleName : Expression {
1897 public string Name;
1898
1899 //
1900 // If true, then we are a simple name, not composed with a ".
1901 //
1902 bool is_base;
1903
1904 public SimpleName (string a, string b, Location l)
1905 {
1906 Name = String.Concat (a, ".", b);
1907 loc = l;
1908 is_base = false;
1909 }
1910
1911 public SimpleName (string name, Location l)
1912 {
1913 Name = name;
1914 loc = l;
1915 is_base = true;
1916 }
1917
1918 public static void Error_ObjectRefRequired (EmitContext ec, Location l, string name)
1919 {
1920 if (ec.IsFieldInitializer)
1921 Report.Error (
1922 236, l,
1923 "A field initializer cannot reference the non-static field, " +
1924 "method or property `"+name+"'");
1925 else
1926 Report.Error (
1927 120, l,
1928 "An object reference is required " +
1929 "for the non-static field `"+name+"'");
1930 }
1931
1932 //
1933 // Checks whether we are trying to access an instance
1934 // property, method or field from a static body.
1935 //
1936 Expression MemberStaticCheck (EmitContext ec, Expression e)
1937 {
1938 if (e is IMemberExpr){
1939 IMemberExpr member = (IMemberExpr) e;
1940
1941 if (!member.IsStatic){
1942 Error_ObjectRefRequired (ec, loc, Name);
1943 return null;
1944 }
1945 }
1946
1947 return e;
1948 }
1949
1950 public override Expression DoResolve (EmitContext ec)
1951 {
1952 return SimpleNameResolve (ec, null, false);
1953 }
1954
1955 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
1956 {
1957 return SimpleNameResolve (ec, right_side, false);
1958 }
1959
1960
1961 public Expression DoResolveAllowStatic (EmitContext ec)
1962 {
1963 return SimpleNameResolve (ec, null, true);
1964 }
1965
1966 public override Expression ResolveAsTypeStep (EmitContext ec)
1967 {
1968 DeclSpace ds = ec.DeclSpace;
1969 NamespaceEntry ns = ds.NamespaceEntry;
1970 Type t;
1971 string alias_value;
1972
1973 //
1974 // Since we are cheating: we only do the Alias lookup for
1975 // namespaces if the name does not include any dots in it
1976 //
1977 if (ns != null && is_base)
1978 alias_value = ns.LookupAlias (Name);
1979 else
1980 alias_value = null;
1981
1982 if (ec.ResolvingTypeTree){
1983 int errors = Report.Errors;
1984 Type dt = ds.FindType (loc, Name);
1985
1986 if (Report.Errors != errors)
1987 return null;
1988
1989 if (dt != null)
1990 return new TypeExpression (dt, loc);
1991
1992 if (alias_value != null){
1993 if ((t = RootContext.LookupType (ds, alias_value, true, loc)) != null)
1994 return new TypeExpression (t, loc);
1995 }
1996 }
1997
1998 //
1999 // First, the using aliases
2000 //
2001 if (alias_value != null){
2002 if ((t = RootContext.LookupType (ds, alias_value, true, loc)) != null)
2003 return new TypeExpression (t, loc);
2004
2005 // we have alias value, but it isn't Type, so try if it's namespace
2006 return new SimpleName (alias_value, loc);
2007 }
2008
2009 //
2010 // Stage 2: Lookup up if we are an alias to a type
2011 // or a namespace.
2012 //
2013
2014 if ((t = RootContext.LookupType (ds, Name, true, loc)) != null)
2015 return new TypeExpression (t, loc);
2016
2017 // No match, maybe our parent can compose us
2018 // into something meaningful.
2019 return this;
2020 }
2021
2022 /// <remarks>
2023 /// 7.5.2: Simple Names.
2024 ///
2025 /// Local Variables and Parameters are handled at
2026 /// parse time, so they never occur as SimpleNames.
2027 ///
2028 /// The `allow_static' flag is used by MemberAccess only
2029 /// and it is used to inform us that it is ok for us to
2030 /// avoid the static check, because MemberAccess might end
2031 /// up resolving the Name as a Type name and the access as
2032 /// a static type access.
2033 ///
2034 /// ie: Type Type; .... { Type.GetType (""); }
2035 ///
2036 /// Type is both an instance variable and a Type; Type.GetType
2037 /// is the static method not an instance method of type.
2038 /// </remarks>
2039 Expression SimpleNameResolve (EmitContext ec, Expression right_side, bool allow_static)
2040 {
2041 Expression e = null;
2042
2043 //
2044 // Stage 1: Performed by the parser (binding to locals or parameters).
2045 //
2046 Block current_block = ec.CurrentBlock;
2047 if (current_block != null){
2048 LocalInfo vi = current_block.GetLocalInfo (Name);
2049 if (vi != null){
2050 Expression var;
2051
2052 var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
2053
2054 if (right_side != null)
2055 return var.ResolveLValue (ec, right_side);
2056 else
2057 return var.Resolve (ec);
2058 }
2059
2060 int idx = -1;
2061 Parameter par = null;
2062 Parameters pars = current_block.Parameters;
2063 if (pars != null)
2064 par = pars.GetParameterByName (Name, out idx);
2065
2066 if (par != null) {
2067 ParameterReference param;
2068
2069 param = new ParameterReference (pars, current_block, idx, Name, loc);
2070
2071 if (right_side != null)
2072 return param.ResolveLValue (ec, right_side);
2073 else
2074 return param.Resolve (ec);
2075 }
2076 }
2077
2078 //
2079 // Stage 2: Lookup members
2080 //
2081
2082 DeclSpace lookup_ds = ec.DeclSpace;
2083 do {
2084 if (lookup_ds.TypeBuilder == null)
2085 break;
2086
2087 e = MemberLookup (ec, lookup_ds.TypeBuilder, Name, loc);
2088 if (e != null)
2089 break;
2090
2091 lookup_ds =lookup_ds.Parent;
2092 } while (lookup_ds != null);
2093
2094 if (e == null && ec.ContainerType != null)
2095 e = MemberLookup (ec, ec.ContainerType, Name, loc);
2096
2097 if (e == null) {
2098 //
2099 // Since we are cheating (is_base is our hint
2100 // that we are the beginning of the name): we
2101 // only do the Alias lookup for namespaces if
2102 // the name does not include any dots in it
2103 //
2104 NamespaceEntry ns = ec.DeclSpace.NamespaceEntry;
2105 if (is_base && ns != null){
2106 string alias_value = ns.LookupAlias (Name);
2107 if (alias_value != null){
2108 Name = alias_value;
2109 Type t;
2110
2111 if ((t = TypeManager.LookupType (Name)) != null)
2112 return new TypeExpression (t, loc);
2113
2114 // No match, maybe our parent can compose us
2115 // into something meaningful.
2116 return this;
2117 }
2118 }
2119
2120 return ResolveAsTypeStep (ec);
2121 }
2122
2123 if (e is TypeExpr)
2124 return e;
2125
2126 if (e is IMemberExpr) {
2127 e = MemberAccess.ResolveMemberAccess (ec, e, null, loc, this);
2128 if (e == null)
2129 return null;
2130
2131 IMemberExpr me = e as IMemberExpr;
2132 if (me == null)
2133 return e;
2134
2135 // This fails if ResolveMemberAccess() was unable to decide whether
2136 // it's a field or a type of the same name.
2137 if (!me.IsStatic && (me.InstanceExpression == null))
2138 return e;
2139
2140 if (!me.IsStatic &&
2141 TypeManager.IsNestedChildOf (me.InstanceExpression.Type, me.DeclaringType) &&
2142 !me.InstanceExpression.Type.IsSubclassOf (me.DeclaringType)) {
2143 Error (38, "Cannot access nonstatic member `" + me.Name + "' of " +
2144 "outer type `" + me.DeclaringType + "' via nested type `" +
2145 me.InstanceExpression.Type + "'");
2146 return null;
2147 }
2148
2149 if (right_side != null)
2150 e = e.DoResolveLValue (ec, right_side);
2151 else
2152 e = e.DoResolve (ec);
2153
2154 return e;
2155 }
2156
2157 if (ec.IsStatic || ec.IsFieldInitializer){
2158 if (allow_static)
2159 return e;
2160
2161 return MemberStaticCheck (ec, e);
2162 } else
2163 return e;
2164 }
2165
2166 public override void Emit (EmitContext ec)
2167 {
2168 //
2169 // If this is ever reached, then we failed to
2170 // find the name as a namespace
2171 //
2172
2173 Error (103, "The name `" + Name +
2174 "' does not exist in the class `" +
2175 ec.DeclSpace.Name + "'");
2176 }
2177
2178 public override string ToString ()
2179 {
2180 return Name;
2181 }
2182 }
2183
2184 /// <summary>
2185 /// Fully resolved expression that evaluates to a type
2186 /// </summary>
2187 public abstract class TypeExpr : Expression {
2188 override public Expression ResolveAsTypeStep (EmitContext ec)
2189 {
2190 TypeExpr t = DoResolveAsTypeStep (ec);
2191 if (t == null)
2192 return null;
2193
2194 eclass = ExprClass.Type;
2195 return t;
2196 }
2197
2198 override public Expression DoResolve (EmitContext ec)
2199 {
2200 return ResolveAsTypeTerminal (ec);
2201 }
2202
2203 override public void Emit (EmitContext ec)
2204 {
2205 throw new Exception ("Should never be called");
2206 }
2207
2208 public virtual bool CheckAccessLevel (DeclSpace ds)
2209 {
2210 return ds.CheckAccessLevel (Type);
2211 }
2212
2213 public virtual bool AsAccessible (DeclSpace ds, int flags)
2214 {
2215 return ds.AsAccessible (Type, flags);
2216 }
2217
2218 public virtual bool IsClass {
2219 get { return Type.IsClass; }
2220 }
2221
2222 public virtual bool IsValueType {
2223 get { return Type.IsValueType; }
2224 }
2225
2226 public virtual bool IsInterface {
2227 get { return Type.IsInterface; }
2228 }
2229
2230 public virtual bool IsSealed {
2231 get { return Type.IsSealed; }
2232 }
2233
2234 public virtual bool CanInheritFrom ()
2235 {
2236 if (Type == TypeManager.enum_type ||
2237 (Type == TypeManager.value_type && RootContext.StdLib) ||
2238 Type == TypeManager.delegate_type ||
2239 Type == TypeManager.array_type)
2240 return false;
2241
2242 return true;
2243 }
2244
2245 public virtual bool IsAttribute {
2246 get {
2247 return Type == TypeManager.attribute_type ||
2248 Type.IsSubclassOf (TypeManager.attribute_type);
2249 }
2250 }
2251
2252 public virtual TypeExpr[] GetInterfaces ()
2253 {
2254 return TypeManager.GetInterfaces (Type);
2255 }
2256
2257 public abstract TypeExpr DoResolveAsTypeStep (EmitContext ec);
2258
2259 public virtual Type ResolveType (EmitContext ec)
2260 {
2261 TypeExpr t = ResolveAsTypeTerminal (ec);
2262 if (t == null)
2263 return null;
2264
2265 return t.Type;
2266 }
2267
2268 public abstract string Name {
2269 get;
2270 }
2271
2272 public override bool Equals (object obj)
2273 {
2274 TypeExpr tobj = obj as TypeExpr;
2275 if (tobj == null)
2276 return false;
2277
2278 return Type == tobj.Type;
2279 }
2280
2281 public override int GetHashCode ()
2282 {
2283 return Type.GetHashCode ();
2284 }
2285
2286 public override string ToString ()
2287 {
2288 return Name;
2289 }
2290 }
2291
2292 public class TypeExpression : TypeExpr {
2293 public TypeExpression (Type t, Location l)
2294 {
2295 Type = t;
2296 eclass = ExprClass.Type;
2297 loc = l;
2298 }
2299
2300 public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
2301 {
2302 return this;
2303 }
2304
2305 public override string Name {
2306 get {
2307 return Type.ToString ();
2308 }
2309 }
2310 }
2311
2312 /// <summary>
2313 /// Used to create types from a fully qualified name. These are just used
2314 /// by the parser to setup the core types. A TypeLookupExpression is always
2315 /// classified as a type.
2316 /// </summary>
2317 public class TypeLookupExpression : TypeExpr {
2318 string name;
2319
2320 public TypeLookupExpression (string name)
2321 {
2322 this.name = name;
2323 }
2324
2325 public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
2326 {
2327 if (type == null)
2328 type = RootContext.LookupType (ec.DeclSpace, name, false, Location.Null);
2329 return this;
2330 }
2331
2332 public override string Name {
2333 get {
2334 return name;
2335 }
2336 }
2337 }
2338
2339 /// <summary>
2340 /// MethodGroup Expression.
2341 ///
2342 /// This is a fully resolved expression that evaluates to a type
2343 /// </summary>
2344 public class MethodGroupExpr : Expression, IMemberExpr {
2345 public MethodBase [] Methods;
2346 Expression instance_expression = null;
2347 bool is_explicit_impl = false;
2348
2349 public MethodGroupExpr (MemberInfo [] mi, Location l)
2350 {
2351 Methods = new MethodBase [mi.Length];
2352 mi.CopyTo (Methods, 0);
2353 eclass = ExprClass.MethodGroup;
2354 type = TypeManager.object_type;
2355 loc = l;
2356 }
2357
2358 public MethodGroupExpr (ArrayList list, Location l)
2359 {
2360 Methods = new MethodBase [list.Count];
2361
2362 try {
2363 list.CopyTo (Methods, 0);
2364 } catch {
2365 foreach (MemberInfo m in list){
2366 if (!(m is MethodBase)){
2367 Console.WriteLine ("Name " + m.Name);
2368 Console.WriteLine ("Found a: " + m.GetType ().FullName);
2369 }
2370 }
2371 throw;
2372 }
2373
2374 loc = l;
2375 eclass = ExprClass.MethodGroup;
2376 type = TypeManager.object_type;
2377 }
2378
2379 public Type DeclaringType {
2380 get {
2381 //
2382 // The methods are arranged in this order:
2383 // derived type -> base type
2384 //
2385 return Methods [0].DeclaringType;
2386 }
2387 }
2388
2389 //
2390 // `A method group may have associated an instance expression'
2391 //
2392 public Expression InstanceExpression {
2393 get {
2394 return instance_expression;
2395 }
2396
2397 set {
2398 instance_expression = value;
2399 }
2400 }
2401
2402 public bool IsExplicitImpl {
2403 get {
2404 return is_explicit_impl;
2405 }
2406
2407 set {
2408 is_explicit_impl = value;
2409 }
2410 }
2411
2412 public string Name {
2413 get {
2414 return Methods [0].Name;
2415 }
2416 }
2417
2418 public bool IsInstance {
2419 get {
2420 foreach (MethodBase mb in Methods)
2421 if (!mb.IsStatic)
2422 return true;
2423
2424 return false;
2425 }
2426 }
2427
2428 public bool IsStatic {
2429 get {
2430 foreach (MethodBase mb in Methods)
2431 if (mb.IsStatic)
2432 return true;
2433
2434 return false;
2435 }
2436 }
2437
2438 override public Expression DoResolve (EmitContext ec)
2439 {
2440 if (!IsInstance)
2441 instance_expression = null;
2442
2443 if (instance_expression != null) {
2444 instance_expression = instance_expression.DoResolve (ec);
2445 if (instance_expression == null)
2446 return null;
2447 }
2448
2449 return this;
2450 }
2451
2452 public void ReportUsageError ()
2453 {
2454 Report.Error (654, loc, "Method `" + DeclaringType + "." +
2455 Name + "()' is referenced without parentheses");
2456 }
2457
2458 override public void Emit (EmitContext ec)
2459 {
2460 ReportUsageError ();
2461 }
2462
2463 bool RemoveMethods (bool keep_static)
2464 {
2465 ArrayList smethods = new ArrayList ();
2466
2467 foreach (MethodBase mb in Methods){
2468 if (mb.IsStatic == keep_static)
2469 smethods.Add (mb);
2470 }
2471
2472 if (smethods.Count == 0)
2473 return false;
2474
2475 Methods = new MethodBase [smethods.Count];
2476 smethods.CopyTo (Methods, 0);
2477
2478 return true;
2479 }
2480
2481 /// <summary>
2482 /// Removes any instance methods from the MethodGroup, returns
2483 /// false if the resulting set is empty.
2484 /// </summary>
2485 public bool RemoveInstanceMethods ()
2486 {
2487 return RemoveMethods (true);
2488 }
2489
2490 /// <summary>
2491 /// Removes any static methods from the MethodGroup, returns
2492 /// false if the resulting set is empty.
2493 /// </summary>
2494 public bool RemoveStaticMethods ()
2495 {
2496 return RemoveMethods (false);
2497 }
2498 }
2499
2500 /// <summary>
2501 /// Fully resolved expression that evaluates to a Field
2502 /// </summary>
2503 public class FieldExpr : Expression, IAssignMethod, IMemoryLocation, IMemberExpr, IVariable {
2504 public readonly FieldInfo FieldInfo;
2505 Expression instance_expr;
2506 VariableInfo variable_info;
2507
2508 public FieldExpr (FieldInfo fi, Location l)
2509 {
2510 FieldInfo = fi;
2511 eclass = ExprClass.Variable;
2512 type = fi.FieldType;
2513 loc = l;
2514 }
2515
2516 public string Name {
2517 get {
2518 return FieldInfo.Name;
2519 }
2520 }
2521
2522 public bool IsInstance {
2523 get {
2524 return !FieldInfo.IsStatic;
2525 }
2526 }
2527
2528 public bool IsStatic {
2529 get {
2530 return FieldInfo.IsStatic;
2531 }
2532 }
2533
2534 public Type DeclaringType {
2535 get {
2536 return FieldInfo.DeclaringType;
2537 }
2538 }
2539
2540 public Expression InstanceExpression {
2541 get {
2542 return instance_expr;
2543 }
2544
2545 set {
2546 instance_expr = value;
2547 }
2548 }
2549
2550 public VariableInfo VariableInfo {
2551 get {
2552 return variable_info;
2553 }
2554 }
2555
2556 override public Expression DoResolve (EmitContext ec)
2557 {
2558 if (!FieldInfo.IsStatic){
2559 if (instance_expr == null){
2560 //
2561 // This can happen when referencing an instance field using
2562 // a fully qualified type expression: TypeName.InstanceField = xxx
2563 //
2564 SimpleName.Error_ObjectRefRequired (ec, loc, FieldInfo.Name);
2565 return null;
2566 }
2567
2568 // Resolve the field's instance expression while flow analysis is turned
2569 // off: when accessing a field "a.b", we must check whether the field
2570 // "a.b" is initialized, not whether the whole struct "a" is initialized.
2571 instance_expr = instance_expr.Resolve (ec, ResolveFlags.VariableOrValue |
2572 ResolveFlags.DisableFlowAnalysis);
2573 if (instance_expr == null)
2574 return null;
2575 }
2576
2577 // If the instance expression is a local variable or parameter.
2578 IVariable var = instance_expr as IVariable;
2579 if ((var == null) || (var.VariableInfo == null))
2580 return this;
2581
2582 VariableInfo vi = var.VariableInfo;
2583 if (!vi.IsFieldAssigned (ec, FieldInfo.Name, loc))
2584 return null;
2585
2586 variable_info = vi.GetSubStruct (FieldInfo.Name);
2587 return this;
2588 }
2589
2590 void Report_AssignToReadonly (bool is_instance)
2591 {
2592 string msg;
2593
2594 if (is_instance)
2595 msg = "Readonly field can not be assigned outside " +
2596 "of constructor or variable initializer";
2597 else
2598 msg = "A static readonly field can only be assigned in " +
2599 "a static constructor";
2600
2601 Report.Error (is_instance ? 191 : 198, loc, msg);
2602 }
2603
2604 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
2605 {
2606 IVariable var = instance_expr as IVariable;
2607 if ((var != null) && (var.VariableInfo != null))
2608 var.VariableInfo.SetFieldAssigned (ec, FieldInfo.Name);
2609
2610 Expression e = DoResolve (ec);
2611
2612 if (e == null)
2613 return null;
2614
2615 if (!FieldInfo.IsStatic && (instance_expr.Type.IsValueType && !(instance_expr is IMemoryLocation))) {
2616 // FIXME: Provide better error reporting.
2617 Error (1612, "Cannot modify expression because it is not a variable.");
2618 return null;
2619 }
2620
2621 if (!FieldInfo.IsInitOnly)
2622 return this;
2623
2624 FieldBase fb = TypeManager.GetField (FieldInfo);
2625 if (fb != null)
2626 fb.SetAssigned ();
2627
2628 //
2629 // InitOnly fields can only be assigned in constructors
2630 //
2631
2632 if (ec.IsConstructor){
2633 if (IsStatic && !ec.IsStatic)
2634 Report_AssignToReadonly (false);
2635
2636 if (ec.ContainerType == FieldInfo.DeclaringType)
2637 return this;
2638 }
2639
2640 Report_AssignToReadonly (true);
2641
2642 return null;
2643 }
2644
2645 public bool VerifyFixed (bool is_expression)
2646 {
2647 IVariable variable = instance_expr as IVariable;
2648 if ((variable == null) || !variable.VerifyFixed (true))
2649 return false;
2650
2651 return true;
2652 }
2653
2654 override public void Emit (EmitContext ec)
2655 {
2656 ILGenerator ig = ec.ig;
2657 bool is_volatile = false;
2658
2659 if (FieldInfo is FieldBuilder){
2660 FieldBase f = TypeManager.GetField (FieldInfo);
2661 if (f != null){
2662 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
2663 is_volatile = true;
2664
2665 f.status |= Field.Status.USED;
2666 }
2667 }
2668
2669 if (FieldInfo.IsStatic){
2670 if (is_volatile)
2671 ig.Emit (OpCodes.Volatile);
2672
2673 ig.Emit (OpCodes.Ldsfld, FieldInfo);
2674 return;
2675 }
2676
2677 if (instance_expr.Type.IsValueType){
2678 IMemoryLocation ml;
2679 LocalTemporary tempo = null;
2680
2681 if (!(instance_expr is IMemoryLocation)){
2682 tempo = new LocalTemporary (ec, instance_expr.Type);
2683
2684 if (ec.RemapToProxy)
2685 ec.EmitThis ();
2686
2687 InstanceExpression.Emit (ec);
2688 tempo.Store (ec);
2689 ml = tempo;
2690 } else
2691 ml = (IMemoryLocation) instance_expr;
2692
2693 ml.AddressOf (ec, AddressOp.Load);
2694 } else {
2695 if (ec.RemapToProxy)
2696 ec.EmitThis ();
2697 else
2698 instance_expr.Emit (ec);
2699 }
2700 if (is_volatile)
2701 ig.Emit (OpCodes.Volatile);
2702
2703 ig.Emit (OpCodes.Ldfld, FieldInfo);
2704 }
2705
2706 public void EmitAssign (EmitContext ec, Expression source)
2707 {
2708 FieldAttributes fa = FieldInfo.Attributes;
2709 bool is_static = (fa & FieldAttributes.Static) != 0;
2710 bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
2711 ILGenerator ig = ec.ig;
2712
2713 if (is_readonly && !ec.IsConstructor){
2714 Report_AssignToReadonly (!is_static);
2715 return;
2716 }
2717
2718 if (!is_static){
2719 Expression instance = instance_expr;
2720
2721 if (instance.Type.IsValueType){
2722 IMemoryLocation ml = (IMemoryLocation) instance;
2723
2724 ml.AddressOf (ec, AddressOp.Store);
2725 } else {
2726 if (ec.RemapToProxy)
2727 ec.EmitThis ();
2728 else
2729 instance.Emit (ec);
2730 }
2731 }
2732
2733 source.Emit (ec);
2734
2735 if (FieldInfo is FieldBuilder){
2736 FieldBase f = TypeManager.GetField (FieldInfo);
2737 if (f != null){
2738 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
2739 ig.Emit (OpCodes.Volatile);
2740
2741 f.status |= Field.Status.ASSIGNED;
2742 }
2743 }
2744
2745 if (is_static)
2746 ig.Emit (OpCodes.Stsfld, FieldInfo);
2747 else
2748 ig.Emit (OpCodes.Stfld, FieldInfo);
2749 }
2750
2751 public void AddressOf (EmitContext ec, AddressOp mode)
2752 {
2753 ILGenerator ig = ec.ig;
2754
2755 if (FieldInfo is FieldBuilder){
2756 FieldBase f = TypeManager.GetField (FieldInfo);
2757 if (f != null){
2758 if ((f.ModFlags & Modifiers.VOLATILE) != 0){
2759 Error (676, "volatile variable: can not take its address, or pass as ref/out parameter");
2760 return;
2761 }
2762
2763 if ((mode & AddressOp.Store) != 0)
2764 f.status |= Field.Status.ASSIGNED;
2765 if ((mode & AddressOp.Load) != 0)
2766 f.status |= Field.Status.USED;
2767 }
2768 }
2769
2770 //
2771 // Handle initonly fields specially: make a copy and then
2772 // get the address of the copy.
2773 //
2774 bool need_copy;
2775 if (FieldInfo.IsInitOnly){
2776 need_copy = true;
2777 if (ec.IsConstructor){
2778 if (FieldInfo.IsStatic){
2779 if (ec.IsStatic)
2780 need_copy = false;
2781 } else
2782 need_copy = false;
2783 }
2784 } else
2785 need_copy = false;
2786
2787 if (need_copy){
2788 LocalBuilder local;
2789 Emit (ec);
2790 local = ig.DeclareLocal (type);
2791 ig.Emit (OpCodes.Stloc, local);
2792 ig.Emit (OpCodes.Ldloca, local);
2793 return;
2794 }
2795
2796
2797 if (FieldInfo.IsStatic){
2798 ig.Emit (OpCodes.Ldsflda, FieldInfo);
2799 } else {
2800 //
2801 // In the case of `This', we call the AddressOf method, which will
2802 // only load the pointer, and not perform an Ldobj immediately after
2803 // the value has been loaded into the stack.
2804 //
2805 if (instance_expr is This)
2806 ((This)instance_expr).AddressOf (ec, AddressOp.LoadStore);
2807 else if (instance_expr.Type.IsValueType && instance_expr is IMemoryLocation){
2808 IMemoryLocation ml = (IMemoryLocation) instance_expr;
2809
2810 ml.AddressOf (ec, AddressOp.LoadStore);
2811 } else
2812 instance_expr.Emit (ec);
2813 ig.Emit (OpCodes.Ldflda, FieldInfo);
2814 }
2815 }
2816 }
2817
2818 //
2819 // A FieldExpr whose address can not be taken
2820 //
2821 public class FieldExprNoAddress : FieldExpr, IMemoryLocation {
2822 public FieldExprNoAddress (FieldInfo fi, Location loc) : base (fi, loc)
2823 {
2824 }
2825
2826 public new void AddressOf (EmitContext ec, AddressOp mode)
2827 {
2828 Report.Error (-215, "Report this: Taking the address of a remapped parameter not supported");
2829 }
2830 }
2831
2832 /// <summary>
2833 /// Expression that evaluates to a Property. The Assign class
2834 /// might set the `Value' expression if we are in an assignment.
2835 ///
2836 /// This is not an LValue because we need to re-write the expression, we
2837 /// can not take data from the stack and store it.
2838 /// </summary>
2839 public class PropertyExpr : ExpressionStatement, IAssignMethod, IMemberExpr {
2840 public readonly PropertyInfo PropertyInfo;
2841
2842 //
2843 // This is set externally by the `BaseAccess' class
2844 //
2845 public bool IsBase;
2846 MethodInfo getter, setter;
2847 bool is_static;
2848 bool must_do_cs1540_check;
2849
2850 Expression instance_expr;
2851
2852 public PropertyExpr (EmitContext ec, PropertyInfo pi, Location l)
2853 {
2854 PropertyInfo = pi;
2855 eclass = ExprClass.PropertyAccess;
2856 is_static = false;
2857 loc = l;
2858
2859 type = TypeManager.TypeToCoreType (pi.PropertyType);
2860
2861 ResolveAccessors (ec);
2862 }
2863
2864 public string Name {
2865 get {
2866 return PropertyInfo.Name;
2867 }
2868 }
2869
2870 public bool IsInstance {
2871 get {
2872 return !is_static;
2873 }
2874 }
2875
2876 public bool IsStatic {
2877 get {
2878 return is_static;
2879 }
2880 }
2881
2882 public Type DeclaringType {
2883 get {
2884 return PropertyInfo.DeclaringType;
2885 }
2886 }
2887
2888 //
2889 // The instance expression associated with this expression
2890 //
2891 public Expression InstanceExpression {
2892 set {
2893 instance_expr = value;
2894 }
2895
2896 get {
2897 return instance_expr;
2898 }
2899 }
2900
2901 public bool VerifyAssignable ()
2902 {
2903 if (setter == null) {
2904 Report.Error (200, loc,
2905 "The property `" + PropertyInfo.Name +
2906 "' can not be assigned to, as it has not set accessor");
2907 return false;
2908 }
2909
2910 return true;
2911 }
2912
2913 MethodInfo GetAccessor (Type invocation_type, string accessor_name)
2914 {
2915 BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic |
2916 BindingFlags.Static | BindingFlags.Instance;
2917 MemberInfo[] group;
2918
2919 group = TypeManager.MemberLookup (
2920 invocation_type, invocation_type, PropertyInfo.DeclaringType,
2921 MemberTypes.Method, flags, accessor_name + "_" + PropertyInfo.Name);
2922
2923 //
2924 // The first method is the closest to us
2925 //
2926 if (group == null)
2927 return null;
2928
2929 foreach (MethodInfo mi in group) {
2930 MethodAttributes ma = mi.Attributes & MethodAttributes.MemberAccessMask;
2931
2932 //
2933 // If only accessible to the current class or children
2934 //
2935 if (ma == MethodAttributes.Private) {
2936 Type declaring_type = mi.DeclaringType;
2937
2938 if (invocation_type != declaring_type){
2939 if (TypeManager.IsSubclassOrNestedChildOf (invocation_type, mi.DeclaringType))
2940 return mi;
2941 else
2942 continue;
2943 } else
2944 return mi;
2945 }
2946 //
2947 // FamAndAssem requires that we not only derivate, but we are on the
2948 // same assembly.
2949 //
2950 if (ma == MethodAttributes.FamANDAssem){
2951 if (mi.DeclaringType.Assembly != invocation_type.Assembly)
2952 continue;
2953 else
2954 return mi;
2955 }
2956
2957 // Assembly and FamORAssem succeed if we're in the same assembly.
2958 if ((ma == MethodAttributes.Assembly) || (ma == MethodAttributes.FamORAssem)){
2959 if (mi.DeclaringType.Assembly == invocation_type.Assembly)
2960 return mi;
2961 }
2962
2963 // We already know that we aren't in the same assembly.
2964 if (ma == MethodAttributes.Assembly)
2965 continue;
2966
2967 // Family and FamANDAssem require that we derive.
2968 if ((ma == MethodAttributes.Family) || (ma == MethodAttributes.FamANDAssem) || (ma == MethodAttributes.FamORAssem)){
2969 if (!TypeManager.IsSubclassOrNestedChildOf (invocation_type, mi.DeclaringType))
2970 continue;
2971 else {
2972 must_do_cs1540_check = true;
2973
2974 return mi;
2975 }
2976 }
2977
2978 return mi;
2979 }
2980
2981 return null;
2982 }
2983
2984 //
2985 // We also perform the permission checking here, as the PropertyInfo does not
2986 // hold the information for the accessibility of its setter/getter
2987 //
2988 void ResolveAccessors (EmitContext ec)
2989 {
2990 getter = GetAccessor (ec.ContainerType, "get");
2991 if ((getter != null) && getter.IsStatic)
2992 is_static = true;
2993
2994 setter = GetAccessor (ec.ContainerType, "set");
2995 if ((setter != null) && setter.IsStatic)
2996 is_static = true;
2997
2998 if (setter == null && getter == null){
2999 Error (122, "`" + PropertyInfo.Name + "' " +
3000 "is inaccessible because of its protection level");
3001
3002 }
3003 }
3004
3005 bool InstanceResolve (EmitContext ec)
3006 {
3007 if ((instance_expr == null) && ec.IsStatic && !is_static) {
3008 SimpleName.Error_ObjectRefRequired (ec, loc, PropertyInfo.Name);
3009 return false;
3010 }
3011
3012 if (instance_expr != null) {
3013 instance_expr = instance_expr.DoResolve (ec);
3014 if (instance_expr == null)
3015 return false;
3016 }
3017
3018 if (must_do_cs1540_check && (instance_expr != null)) {
3019 if ((instance_expr.Type != ec.ContainerType) &&
3020 ec.ContainerType.IsSubclassOf (instance_expr.Type)) {
3021 Report.Error (1540, loc, "Cannot access protected member `" +
3022 PropertyInfo.DeclaringType + "." + PropertyInfo.Name +
3023 "' via a qualifier of type `" +
3024 TypeManager.CSharpName (instance_expr.Type) +
3025 "'; the qualifier must be of type `" +
3026 TypeManager.CSharpName (ec.ContainerType) +
3027 "' (or derived from it)");
3028 return false;
3029 }
3030 }
3031
3032 return true;
3033 }
3034
3035 override public Expression DoResolve (EmitContext ec)
3036 {
3037 if (getter == null){
3038 //
3039 // The following condition happens if the PropertyExpr was
3040 // created, but is invalid (ie, the property is inaccessible),
3041 // and we did not want to embed the knowledge about this in
3042 // the caller routine. This only avoids double error reporting.
3043 //
3044 if (setter == null)
3045 return null;
3046
3047 Report.Error (154, loc,
3048 "The property `" + PropertyInfo.Name +
3049 "' can not be used in " +
3050 "this context because it lacks a get accessor");
3051 return null;
3052 }
3053
3054 if (!InstanceResolve (ec))
3055 return null;
3056
3057 //
3058 // Only base will allow this invocation to happen.
3059 //
3060 if (IsBase && getter.IsAbstract){
3061 Report.Error (205, loc, "Cannot call an abstract base property: " +
3062 PropertyInfo.DeclaringType + "." +PropertyInfo.Name);
3063 return null;
3064 }
3065
3066 return this;
3067 }
3068
3069 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
3070 {
3071 if (setter == null){
3072 //
3073 // The following condition happens if the PropertyExpr was
3074 // created, but is invalid (ie, the property is inaccessible),
3075 // and we did not want to embed the knowledge about this in
3076 // the caller routine. This only avoids double error reporting.
3077 //
3078 if (getter == null)
3079 return null;
3080
3081 Report.Error (154, loc,
3082 "The property `" + PropertyInfo.Name +
3083 "' can not be used in " +
3084 "this context because it lacks a set accessor");
3085 return null;
3086 }
3087
3088 if (!InstanceResolve (ec))
3089 return null;
3090
3091 //
3092 // Only base will allow this invocation to happen.
3093 //
3094 if (IsBase && setter.IsAbstract){
3095 Report.Error (205, loc, "Cannot call an abstract base property: " +
3096 PropertyInfo.DeclaringType + "." +PropertyInfo.Name);
3097 return null;
3098 }
3099 return this;
3100 }
3101
3102 override public void Emit (EmitContext ec)
3103 {
3104 //
3105 // Special case: length of single dimension array property is turned into ldlen
3106 //
3107 if ((getter == TypeManager.system_int_array_get_length) ||
3108 (getter == TypeManager.int_array_get_length)){
3109 Type iet = instance_expr.Type;
3110
3111 //
3112 // System.Array.Length can be called, but the Type does not
3113 // support invoking GetArrayRank, so test for that case first
3114 //
3115 if (iet != TypeManager.array_type && (iet.GetArrayRank () == 1)){
3116 instance_expr.Emit (ec);
3117 ec.ig.Emit (OpCodes.Ldlen);
3118 ec.ig.Emit (OpCodes.Conv_I4);
3119 return;
3120 }
3121 }
3122
3123 Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, getter, null, loc);
3124
3125 }
3126
3127 //
3128 // Implements the IAssignMethod interface for assignments
3129 //
3130 public void EmitAssign (EmitContext ec, Expression source)
3131 {
3132 Argument arg = new Argument (source, Argument.AType.Expression);
3133 ArrayList args = new ArrayList ();
3134
3135 args.Add (arg);
3136 Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, setter, args, loc);
3137 }
3138
3139 override public void EmitStatement (EmitContext ec)
3140 {
3141 Emit (ec);
3142 ec.ig.Emit (OpCodes.Pop);
3143 }
3144 }
3145
3146 /// <summary>
3147 /// Fully resolved expression that evaluates to an Event
3148 /// </summary>
3149 public class EventExpr : Expression, IMemberExpr {
3150 public readonly EventInfo EventInfo;
3151 public Expression instance_expr;
3152
3153 bool is_static;
3154 MethodInfo add_accessor, remove_accessor;
3155
3156 public EventExpr (EventInfo ei, Location loc)
3157 {
3158 EventInfo = ei;
3159 this.loc = loc;
3160 eclass = ExprClass.EventAccess;
3161
3162 add_accessor = TypeManager.GetAddMethod (ei);
3163 remove_accessor = TypeManager.GetRemoveMethod (ei);
3164
3165 if (add_accessor.IsStatic || remove_accessor.IsStatic)
3166 is_static = true;
3167
3168 if (EventInfo is MyEventBuilder){
3169 MyEventBuilder eb = (MyEventBuilder) EventInfo;
3170 type = eb.EventType;
3171 eb.SetUsed ();
3172 } else
3173 type = EventInfo.EventHandlerType;
3174 }
3175
3176 public string Name {
3177 get {
3178 return EventInfo.Name;
3179 }
3180 }
3181
3182 public bool IsInstance {
3183 get {
3184 return !is_static;
3185 }
3186 }
3187
3188 public bool IsStatic {
3189 get {
3190 return is_static;
3191 }
3192 }
3193
3194 public Type DeclaringType {
3195 get {
3196 return EventInfo.DeclaringType;
3197 }
3198 }
3199
3200 public Expression InstanceExpression {
3201 get {
3202 return instance_expr;
3203 }
3204
3205 set {
3206 instance_expr = value;
3207 }
3208 }
3209
3210 public override Expression DoResolve (EmitContext ec)
3211 {
3212 if (instance_expr != null) {
3213 instance_expr = instance_expr.DoResolve (ec);
3214 if (instance_expr == null)
3215 return null;
3216 }
3217
3218
3219 return this;
3220 }
3221
3222 public override void Emit (EmitContext ec)
3223 {
3224 Report.Error (70, loc, "The event `" + Name + "' can only appear on the left hand side of += or -= (except on the defining type)");
3225 }
3226
3227 public void EmitAddOrRemove (EmitContext ec, Expression source)
3228 {
3229 BinaryDelegate source_del = (BinaryDelegate) source;
3230 Expression handler = source_del.Right;
3231
3232 Argument arg = new Argument (handler, Argument.AType.Expression);
3233 ArrayList args = new ArrayList ();
3234
3235 args.Add (arg);
3236
3237 if (source_del.IsAddition)
3238 Invocation.EmitCall (
3239 ec, false, IsStatic, instance_expr, add_accessor, args, loc);
3240 else
3241 Invocation.EmitCall (
3242 ec, false, IsStatic, instance_expr, remove_accessor, args, loc);
3243 }
3244 }
3245 }
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