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2006-09-14 Jonathan Chambers <joncham@gmail.com>
[mcs.git] / mcs / ecore.cs
blobd638df60cb16847bb2b42e850c722f26cb054ac4
1 //
2 // ecore.cs: Core of the Expression representation for the intermediate tree.
3 //
4 // Author:
5 // Miguel de Icaza (miguel@ximian.com)
6 // Marek Safar (marek.safar@seznam.cz)
7 //
8 // (C) 2001, 2002, 2003 Ximian, Inc.
9 //
10 //
11
12 namespace Mono.CSharp {
13 using System;
14 using System.Collections;
15 using System.Diagnostics;
16 using System.Reflection;
17 using System.Reflection.Emit;
18 using System.Text;
19
20 /// <remarks>
21 /// The ExprClass class contains the is used to pass the
22 /// classification of an expression (value, variable, namespace,
23 /// type, method group, property access, event access, indexer access,
24 /// nothing).
25 /// </remarks>
26 public enum ExprClass : byte {
27 Invalid,
28
29 Value,
30 Variable,
31 Namespace,
32 Type,
33 MethodGroup,
34 PropertyAccess,
35 EventAccess,
36 IndexerAccess,
37 Nothing,
38 }
39
40 /// <remarks>
41 /// This is used to tell Resolve in which types of expressions we're
42 /// interested.
43 /// </remarks>
44 [Flags]
45 public enum ResolveFlags {
46 // Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
47 VariableOrValue = 1,
48
49 // Returns a type expression.
50 Type = 2,
51
52 // Returns a method group.
53 MethodGroup = 4,
54
55 // Mask of all the expression class flags.
56 MaskExprClass = 7,
57
58 // Disable control flow analysis while resolving the expression.
59 // This is used when resolving the instance expression of a field expression.
60 DisableFlowAnalysis = 8,
61
62 // Set if this is resolving the first part of a MemberAccess.
63 Intermediate = 16,
64
65 // Disable control flow analysis _of struct_ while resolving the expression.
66 // This is used when resolving the instance expression of a field expression.
67 DisableStructFlowAnalysis = 32,
68
69 }
70
71 //
72 // This is just as a hint to AddressOf of what will be done with the
73 // address.
74 [Flags]
75 public enum AddressOp {
76 Store = 1,
77 Load = 2,
78 LoadStore = 3
79 };
80
81 /// <summary>
82 /// This interface is implemented by variables
83 /// </summary>
84 public interface IMemoryLocation {
85 /// <summary>
86 /// The AddressOf method should generate code that loads
87 /// the address of the object and leaves it on the stack.
88 ///
89 /// The `mode' argument is used to notify the expression
90 /// of whether this will be used to read from the address or
91 /// write to the address.
92 ///
93 /// This is just a hint that can be used to provide good error
94 /// reporting, and should have no other side effects.
95 /// </summary>
96 void AddressOf (EmitContext ec, AddressOp mode);
97 }
98
99 /// <summary>
100 /// This interface is implemented by variables
101 /// </summary>
102 public interface IVariable {
103 VariableInfo VariableInfo {
104 get;
105 }
106
107 bool VerifyFixed ();
108 }
109
110 /// <remarks>
111 /// Base class for expressions
112 /// </remarks>
113 public abstract class Expression {
114 public ExprClass eclass;
115 protected Type type;
116 protected Location loc;
117
118 public Type Type {
119 get { return type; }
120 set { type = value; }
121 }
122
123 public virtual Location Location {
124 get { return loc; }
125 }
126
127 /// <summary>
128 /// Utility wrapper routine for Error, just to beautify the code
129 /// </summary>
130 public void Error (int error, string s)
131 {
132 Report.Error (error, loc, s);
133 }
134
135 // Not nice but we have broken hierarchy.
136 public virtual void CheckMarshalByRefAccess ()
137 {
138 }
139
140 public virtual bool GetAttributableValue (Type valueType, out object value)
141 {
142 Attribute.Error_AttributeArgumentNotValid (loc);
143 value = null;
144 return false;
145 }
146
147 public virtual string GetSignatureForError ()
148 {
149 return TypeManager.CSharpName (type);
150 }
151
152 public static bool IsAccessorAccessible (Type invocation_type, MethodInfo mi, out bool must_do_cs1540_check)
153 {
154 MethodAttributes ma = mi.Attributes & MethodAttributes.MemberAccessMask;
155
156 must_do_cs1540_check = false; // by default we do not check for this
157
158 //
159 // If only accessible to the current class or children
160 //
161 if (ma == MethodAttributes.Private)
162 return invocation_type == mi.DeclaringType ||
163 TypeManager.IsNestedChildOf (invocation_type, mi.DeclaringType);
164
165 if (mi.DeclaringType.Assembly == invocation_type.Assembly) {
166 if (ma == MethodAttributes.Assembly || ma == MethodAttributes.FamORAssem)
167 return true;
168 } else {
169 if (ma == MethodAttributes.Assembly || ma == MethodAttributes.FamANDAssem)
170 return false;
171 }
172
173 // Family and FamANDAssem require that we derive.
174 // FamORAssem requires that we derive if in different assemblies.
175 if (ma == MethodAttributes.Family ||
176 ma == MethodAttributes.FamANDAssem ||
177 ma == MethodAttributes.FamORAssem) {
178 if (!TypeManager.IsNestedFamilyAccessible (invocation_type, mi.DeclaringType))
179 return false;
180
181 if (!TypeManager.IsNestedChildOf (invocation_type, mi.DeclaringType))
182 must_do_cs1540_check = true;
183
184 return true;
185 }
186
187 return true;
188 }
189
190 /// <summary>
191 /// Performs semantic analysis on the Expression
192 /// </summary>
193 ///
194 /// <remarks>
195 /// The Resolve method is invoked to perform the semantic analysis
196 /// on the node.
197 ///
198 /// The return value is an expression (it can be the
199 /// same expression in some cases) or a new
200 /// expression that better represents this node.
201 ///
202 /// For example, optimizations of Unary (LiteralInt)
203 /// would return a new LiteralInt with a negated
204 /// value.
205 ///
206 /// If there is an error during semantic analysis,
207 /// then an error should be reported (using Report)
208 /// and a null value should be returned.
209 ///
210 /// There are two side effects expected from calling
211 /// Resolve(): the the field variable "eclass" should
212 /// be set to any value of the enumeration
213 /// `ExprClass' and the type variable should be set
214 /// to a valid type (this is the type of the
215 /// expression).
216 /// </remarks>
217 public abstract Expression DoResolve (EmitContext ec);
218
219 public virtual Expression DoResolveLValue (EmitContext ec, Expression right_side)
220 {
221 return null;
222 }
223
224 //
225 // This is used if the expression should be resolved as a type or namespace name.
226 // the default implementation fails.
227 //
228 public virtual FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
229 {
230 return null;
231 }
232
233 //
234 // This is used to resolve the expression as a type, a null
235 // value will be returned if the expression is not a type
236 // reference
237 //
238 public virtual TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
239 {
240 TypeExpr te = ResolveAsBaseTerminal (ec, silent);
241 if (te == null)
242 return null;
243
244 ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (te.Type);
245 if (obsolete_attr != null && !ec.IsInObsoleteScope) {
246 AttributeTester.Report_ObsoleteMessage (obsolete_attr, te.GetSignatureForError (), Location);
247 }
248 return te;
249 }
250
251 public TypeExpr ResolveAsBaseTerminal (IResolveContext ec, bool silent)
252 {
253 int errors = Report.Errors;
254
255 FullNamedExpression fne = ResolveAsTypeStep (ec, silent);
256
257 if (fne == null){
258 if (!silent && errors == Report.Errors)
259 Report.Error (118, loc, "Expecting a type.");
260 return null;
261 }
262
263 if (fne.eclass != ExprClass.Type) {
264 if (!silent && errors == Report.Errors)
265 fne.Error_UnexpectedKind (null, "type", loc);
266 return null;
267 }
268
269 TypeExpr te = fne as TypeExpr;
270
271 if (!te.CheckAccessLevel (ec.DeclContainer)) {
272 Report.SymbolRelatedToPreviousError (te.Type);
273 ErrorIsInaccesible (loc, TypeManager.CSharpName (te.Type));
274 return null;
275 }
276
277 te.loc = loc;
278 return te;
279 }
280
281 public static void ErrorIsInaccesible (Location loc, string name)
282 {
283 Report.Error (122, loc, "`{0}' is inaccessible due to its protection level", name);
284 }
285
286 protected static void Error_CannotAccessProtected (Location loc, MemberInfo m, Type qualifier, Type container)
287 {
288 Report.Error (1540, loc, "Cannot access protected member `{0}' via a qualifier of type `{1}';"
289 + " the qualifier must be of type `{2}' (or derived from it)",
290 TypeManager.GetFullNameSignature (m),
291 TypeManager.CSharpName (qualifier),
292 TypeManager.CSharpName (container));
293
294 }
295
296 public static void Error_VoidInvalidInTheContext (Location loc)
297 {
298 Report.Error (1547, loc, "Keyword `void' cannot be used in this context");
299 }
300
301 public virtual void Error_ValueCannotBeConverted (Location loc, Type target, bool expl)
302 {
303 if (Type.Name == target.Name){
304 Report.ExtraInformation (loc,
305 String.Format (
306 "The type {0} has two conflicting definitions, one comes from {1} and the other from {2}",
307 Type.Name, Type.Assembly.FullName, target.Assembly.FullName));
308
309 }
310
311 if (expl) {
312 Report.Error (30, loc, "Cannot convert type `{0}' to `{1}'",
313 GetSignatureForError (), TypeManager.CSharpName (target));
314 return;
315 }
316
317 Expression e = (this is EnumConstant) ? ((EnumConstant)this).Child : this;
318 bool b = Convert.ExplicitNumericConversion (e, target) != null;
319
320 if (b || Convert.ExplicitReferenceConversionExists (Type, target) || Convert.ExplicitUnsafe (e, target) != null) {
321 Report.Error (266, loc, "Cannot implicitly convert type `{0}' to `{1}'. An explicit conversion exists (are you missing a cast?)",
322 TypeManager.CSharpName (Type), TypeManager.CSharpName (target));
323 return;
324 }
325
326 if (Type != TypeManager.string_type && this is Constant && !(this is NullCast)) {
327 Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
328 GetSignatureForError (), TypeManager.CSharpName (target));
329 return;
330 }
331
332 Report.Error (29, loc, "Cannot implicitly convert type {0} to `{1}'",
333 Type == TypeManager.anonymous_method_type ?
334 "anonymous method" : "`" + GetSignatureForError () + "'",
335 TypeManager.CSharpName (target));
336 }
337
338 protected static void Error_TypeDoesNotContainDefinition (Location loc, Type type, string name)
339 {
340 Report.Error (117, loc, "`{0}' does not contain a definition for `{1}'",
341 TypeManager.CSharpName (type), name);
342 }
343
344 ResolveFlags ExprClassToResolveFlags
345 {
346 get {
347 switch (eclass) {
348 case ExprClass.Type:
349 case ExprClass.Namespace:
350 return ResolveFlags.Type;
351
352 case ExprClass.MethodGroup:
353 return ResolveFlags.MethodGroup;
354
355 case ExprClass.Value:
356 case ExprClass.Variable:
357 case ExprClass.PropertyAccess:
358 case ExprClass.EventAccess:
359 case ExprClass.IndexerAccess:
360 return ResolveFlags.VariableOrValue;
361
362 default:
363 throw new Exception ("Expression " + GetType () +
364 " ExprClass is Invalid after resolve");
365 }
366 }
367 }
368
369 /// <summary>
370 /// Resolves an expression and performs semantic analysis on it.
371 /// </summary>
372 ///
373 /// <remarks>
374 /// Currently Resolve wraps DoResolve to perform sanity
375 /// checking and assertion checking on what we expect from Resolve.
376 /// </remarks>
377 public Expression Resolve (EmitContext ec, ResolveFlags flags)
378 {
379 if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type)
380 return ResolveAsTypeStep (ec, false);
381
382 bool do_flow_analysis = ec.DoFlowAnalysis;
383 bool omit_struct_analysis = ec.OmitStructFlowAnalysis;
384 if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
385 do_flow_analysis = false;
386 if ((flags & ResolveFlags.DisableStructFlowAnalysis) != 0)
387 omit_struct_analysis = true;
388
389 Expression e;
390 using (ec.WithFlowAnalysis (do_flow_analysis, omit_struct_analysis)) {
391 if (this is SimpleName) {
392 bool intermediate = (flags & ResolveFlags.Intermediate) == ResolveFlags.Intermediate;
393 e = ((SimpleName) this).DoResolve (ec, intermediate);
394 } else {
395 e = DoResolve (ec);
396 }
397 }
398
399 if (e == null)
400 return null;
401
402 if ((flags & e.ExprClassToResolveFlags) == 0) {
403 e.Error_UnexpectedKind (flags, loc);
404 return null;
405 }
406
407 if (e.type == null && !(e is Namespace)) {
408 throw new Exception (
409 "Expression " + e.GetType () +
410 " did not set its type after Resolve\n" +
411 "called from: " + this.GetType ());
412 }
413
414 return e;
415 }
416
417 /// <summary>
418 /// Resolves an expression and performs semantic analysis on it.
419 /// </summary>
420 public Expression Resolve (EmitContext ec)
421 {
422 Expression e = Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
423
424 if (e != null && e.eclass == ExprClass.MethodGroup && RootContext.Version == LanguageVersion.ISO_1) {
425 ((MethodGroupExpr) e).ReportUsageError ();
426 return null;
427 }
428 return e;
429 }
430
431 public Constant ResolveAsConstant (EmitContext ec, MemberCore mc)
432 {
433 Expression e = Resolve (ec);
434 if (e == null)
435 return null;
436
437 Constant c = e as Constant;
438 if (c != null)
439 return c;
440
441 Type constant_type = null;
442 if (mc is MemberBase) {
443 constant_type = ((MemberBase)mc).MemberType;
444 }
445
446 Const.Error_ExpressionMustBeConstant (constant_type, loc, mc.GetSignatureForError ());
447 return null;
448 }
449
450 /// <summary>
451 /// Resolves an expression for LValue assignment
452 /// </summary>
453 ///
454 /// <remarks>
455 /// Currently ResolveLValue wraps DoResolveLValue to perform sanity
456 /// checking and assertion checking on what we expect from Resolve
457 /// </remarks>
458 public Expression ResolveLValue (EmitContext ec, Expression right_side, Location loc)
459 {
460 int errors = Report.Errors;
461 bool out_access = right_side == EmptyExpression.OutAccess;
462
463 Expression e = DoResolveLValue (ec, right_side);
464
465 if (e != null && out_access && !(e is IMemoryLocation)) {
466 // FIXME: There's no problem with correctness, the 'Expr = null' handles that.
467 // Enabling this 'throw' will "only" result in deleting useless code elsewhere,
468
469 //throw new InternalErrorException ("ResolveLValue didn't return an IMemoryLocation: " +
470 // e.GetType () + " " + e.GetSignatureForError ());
471 e = null;
472 }
473
474 if (e == null) {
475 if (errors == Report.Errors) {
476 if (out_access)
477 Report.Error (1510, loc, "A ref or out argument must be an assignable variable");
478 else
479 Report.Error (131, loc, "The left-hand side of an assignment or mutating operation must be a variable, property or indexer");
480 }
481 return null;
482 }
483
484 if (e.eclass == ExprClass.Invalid)
485 throw new Exception ("Expression " + e + " ExprClass is Invalid after resolve");
486
487 if (e.eclass == ExprClass.MethodGroup) {
488 ((MethodGroupExpr) e).ReportUsageError ();
489 return null;
490 }
491
492 if (e.type == null)
493 throw new Exception ("Expression " + e + " did not set its type after Resolve");
494
495 return e;
496 }
497
498 /// <summary>
499 /// Emits the code for the expression
500 /// </summary>
501 ///
502 /// <remarks>
503 /// The Emit method is invoked to generate the code
504 /// for the expression.
505 /// </remarks>
506 public abstract void Emit (EmitContext ec);
507
508 public virtual void EmitBranchable (EmitContext ec, Label target, bool onTrue)
509 {
510 Emit (ec);
511 ec.ig.Emit (onTrue ? OpCodes.Brtrue : OpCodes.Brfalse, target);
512 }
513
514 /// <summary>
515 /// Protected constructor. Only derivate types should
516 /// be able to be created
517 /// </summary>
518
519 protected Expression ()
520 {
521 eclass = ExprClass.Invalid;
522 type = null;
523 }
524
525 /// <summary>
526 /// Returns a literalized version of a literal FieldInfo
527 /// </summary>
528 ///
529 /// <remarks>
530 /// The possible return values are:
531 /// IntConstant, UIntConstant
532 /// LongLiteral, ULongConstant
533 /// FloatConstant, DoubleConstant
534 /// StringConstant
535 ///
536 /// The value returned is already resolved.
537 /// </remarks>
538 public static Constant Constantify (object v, Type t)
539 {
540 if (t == TypeManager.int32_type)
541 return new IntConstant ((int) v, Location.Null);
542 else if (t == TypeManager.uint32_type)
543 return new UIntConstant ((uint) v, Location.Null);
544 else if (t == TypeManager.int64_type)
545 return new LongConstant ((long) v, Location.Null);
546 else if (t == TypeManager.uint64_type)
547 return new ULongConstant ((ulong) v, Location.Null);
548 else if (t == TypeManager.float_type)
549 return new FloatConstant ((float) v, Location.Null);
550 else if (t == TypeManager.double_type)
551 return new DoubleConstant ((double) v, Location.Null);
552 else if (t == TypeManager.string_type)
553 return new StringConstant ((string) v, Location.Null);
554 else if (t == TypeManager.short_type)
555 return new ShortConstant ((short)v, Location.Null);
556 else if (t == TypeManager.ushort_type)
557 return new UShortConstant ((ushort)v, Location.Null);
558 else if (t == TypeManager.sbyte_type)
559 return new SByteConstant ((sbyte)v, Location.Null);
560 else if (t == TypeManager.byte_type)
561 return new ByteConstant ((byte)v, Location.Null);
562 else if (t == TypeManager.char_type)
563 return new CharConstant ((char)v, Location.Null);
564 else if (t == TypeManager.bool_type)
565 return new BoolConstant ((bool) v, Location.Null);
566 else if (t == TypeManager.decimal_type)
567 return new DecimalConstant ((decimal) v, Location.Null);
568 else if (TypeManager.IsEnumType (t)){
569 Type real_type = TypeManager.TypeToCoreType (v.GetType ());
570 if (real_type == t)
571 real_type = System.Enum.GetUnderlyingType (real_type);
572
573 Constant e = Constantify (v, real_type);
574
575 return new EnumConstant (e, t);
576 } else if (v == null && !TypeManager.IsValueType (t))
577 return new NullLiteral (Location.Null);
578 else
579 throw new Exception ("Unknown type for constant (" + t +
580 "), details: " + v);
581 }
582
583 /// <summary>
584 /// Returns a fully formed expression after a MemberLookup
585 /// </summary>
586 ///
587 public static Expression ExprClassFromMemberInfo (Type containerType, MemberInfo mi, Location loc)
588 {
589 if (mi is EventInfo)
590 return new EventExpr ((EventInfo) mi, loc);
591 else if (mi is FieldInfo)
592 return new FieldExpr ((FieldInfo) mi, loc);
593 else if (mi is PropertyInfo)
594 return new PropertyExpr (containerType, (PropertyInfo) mi, loc);
595 else if (mi is Type){
596 return new TypeExpression ((System.Type) mi, loc);
597 }
598
599 return null;
600 }
601
602 protected static ArrayList almostMatchedMembers = new ArrayList (4);
603
604 //
605 // FIXME: Probably implement a cache for (t,name,current_access_set)?
606 //
607 // This code could use some optimizations, but we need to do some
608 // measurements. For example, we could use a delegate to `flag' when
609 // something can not any longer be a method-group (because it is something
610 // else).
611 //
612 // Return values:
613 // If the return value is an Array, then it is an array of
614 // MethodBases
615 //
616 // If the return value is an MemberInfo, it is anything, but a Method
617 //
618 // null on error.
619 //
620 // FIXME: When calling MemberLookup inside an `Invocation', we should pass
621 // the arguments here and have MemberLookup return only the methods that
622 // match the argument count/type, unlike we are doing now (we delay this
623 // decision).
624 //
625 // This is so we can catch correctly attempts to invoke instance methods
626 // from a static body (scan for error 120 in ResolveSimpleName).
627 //
628 //
629 // FIXME: Potential optimization, have a static ArrayList
630 //
631
632 public static Expression MemberLookup (Type container_type, Type queried_type, string name,
633 MemberTypes mt, BindingFlags bf, Location loc)
634 {
635 return MemberLookup (container_type, null, queried_type, name, mt, bf, loc);
636 }
637
638 //
639 // Lookup type `queried_type' for code in class `container_type' with a qualifier of
640 // `qualifier_type' or null to lookup members in the current class.
641 //
642
643 public static Expression MemberLookup (Type container_type,
644 Type qualifier_type, Type queried_type,
645 string name, MemberTypes mt,
646 BindingFlags bf, Location loc)
647 {
648 almostMatchedMembers.Clear ();
649
650 MemberInfo [] mi = TypeManager.MemberLookup (container_type, qualifier_type,
651 queried_type, mt, bf, name, almostMatchedMembers);
652
653 if (mi == null)
654 return null;
655
656 if (mi.Length > 1) {
657 bool is_interface = qualifier_type != null && qualifier_type.IsInterface;
658 MemberInfo non_method = null;
659 ArrayList methods = new ArrayList (2);
660
661 foreach (MemberInfo m in mi) {
662 if (m is MethodBase) {
663 methods.Add (m);
664 continue;
665 }
666
667 if (non_method == null) {
668 non_method = m;
669 continue;
670 }
671
672 if (!is_interface)
673 continue;
674
675 Report.SymbolRelatedToPreviousError (m);
676 Report.SymbolRelatedToPreviousError (non_method);
677 Report.Error (229, loc, "Ambiguity between `{0}' and `{1}'",
678 TypeManager.GetFullNameSignature (m), TypeManager.GetFullNameSignature (non_method));
679 return null;
680 }
681
682 if (non_method != null && is_interface) {
683 MethodBase method = (MethodBase)methods[0];
684 Report.SymbolRelatedToPreviousError (method);
685 Report.SymbolRelatedToPreviousError (non_method);
686 Report.Warning (467, 2, loc, "Ambiguity between method `{0}' and non-method `{1}'. Using method `{0}'",
687 TypeManager.CSharpSignature (method), TypeManager.GetFullNameSignature (non_method));
688 }
689
690 if (methods.Count == 0)
691 return new MethodGroupExpr (mi, loc);
692
693 return new MethodGroupExpr (methods, loc);
694 }
695
696 if (mi [0] is MethodBase)
697 return new MethodGroupExpr (mi, loc);
698
699 return ExprClassFromMemberInfo (container_type, mi [0], loc);
700 }
701
702 public const MemberTypes AllMemberTypes =
703 MemberTypes.Constructor |
704 MemberTypes.Event |
705 MemberTypes.Field |
706 MemberTypes.Method |
707 MemberTypes.NestedType |
708 MemberTypes.Property;
709
710 public const BindingFlags AllBindingFlags =
711 BindingFlags.Public |
712 BindingFlags.Static |
713 BindingFlags.Instance;
714
715 public static Expression MemberLookup (Type container_type, Type queried_type,
716 string name, Location loc)
717 {
718 return MemberLookup (container_type, null, queried_type, name,
719 AllMemberTypes, AllBindingFlags, loc);
720 }
721
722 public static Expression MemberLookup (Type container_type, Type qualifier_type,
723 Type queried_type, string name, Location loc)
724 {
725 return MemberLookup (container_type, qualifier_type, queried_type,
726 name, AllMemberTypes, AllBindingFlags, loc);
727 }
728
729 public static Expression MethodLookup (EmitContext ec, Type queried_type,
730 string name, Location loc)
731 {
732 return MemberLookup (ec.ContainerType, null, queried_type, name,
733 MemberTypes.Method, AllBindingFlags, loc);
734 }
735
736 /// <summary>
737 /// This is a wrapper for MemberLookup that is not used to "probe", but
738 /// to find a final definition. If the final definition is not found, we
739 /// look for private members and display a useful debugging message if we
740 /// find it.
741 /// </summary>
742 public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
743 Type queried_type, string name, Location loc)
744 {
745 return MemberLookupFinal (ec, qualifier_type, queried_type, name,
746 AllMemberTypes, AllBindingFlags, loc);
747 }
748
749 public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
750 Type queried_type, string name,
751 MemberTypes mt, BindingFlags bf,
752 Location loc)
753 {
754 Expression e;
755
756 int errors = Report.Errors;
757
758 e = MemberLookup (ec.ContainerType, qualifier_type, queried_type, name, mt, bf, loc);
759
760 if (e == null && errors == Report.Errors)
761 // No errors were reported by MemberLookup, but there was an error.
762 MemberLookupFailed (ec.ContainerType, qualifier_type, queried_type, name, null, true, loc);
763
764 return e;
765 }
766
767 public static void MemberLookupFailed (Type container_type, Type qualifier_type,
768 Type queried_type, string name,
769 string class_name, bool complain_if_none_found,
770 Location loc)
771 {
772 if (almostMatchedMembers.Count != 0) {
773 for (int i = 0; i < almostMatchedMembers.Count; ++i) {
774 MemberInfo m = (MemberInfo) almostMatchedMembers [i];
775 for (int j = 0; j < i; ++j) {
776 if (m == almostMatchedMembers [j]) {
777 m = null;
778 break;
779 }
780 }
781 if (m == null)
782 continue;
783
784 Type declaring_type = m.DeclaringType;
785
786 Report.SymbolRelatedToPreviousError (m);
787 if (qualifier_type == null) {
788 Report.Error (38, loc, "Cannot access a nonstatic member of outer type `{0}' via nested type `{1}'",
789 TypeManager.CSharpName (m.DeclaringType),
790 TypeManager.CSharpName (container_type));
791
792 } else if (qualifier_type != container_type &&
793 TypeManager.IsNestedFamilyAccessible (container_type, declaring_type)) {
794 // Although a derived class can access protected members of
795 // its base class it cannot do so through an instance of the
796 // base class (CS1540). If the qualifier_type is a base of the
797 // ec.ContainerType and the lookup succeeds with the latter one,
798 // then we are in this situation.
799 Error_CannotAccessProtected (loc, m, qualifier_type, container_type);
800 } else {
801 Report.SymbolRelatedToPreviousError (m);
802 ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (m));
803 }
804 }
805 almostMatchedMembers.Clear ();
806 return;
807 }
808
809 MemberInfo[] lookup = null;
810 if (queried_type == null) {
811 class_name = "global::";
812 } else {
813 lookup = TypeManager.MemberLookup (queried_type, null, queried_type,
814 AllMemberTypes, AllBindingFlags |
815 BindingFlags.NonPublic, name, null);
816 }
817
818 if (lookup == null) {
819 if (!complain_if_none_found)
820 return;
821
822 if (class_name != null)
823 Report.Error (103, loc, "The name `{0}' does not exist in the context of `{1}'",
824 name, class_name);
825 else
826 Error_TypeDoesNotContainDefinition (loc, queried_type, name);
827 return;
828 }
829
830 MemberList ml = TypeManager.FindMembers (queried_type, MemberTypes.Constructor,
831 BindingFlags.Static | BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly, null, null);
832 if (name == ".ctor" && ml.Count == 0)
833 {
834 Report.Error (143, loc, "The type `{0}' has no constructors defined", TypeManager.CSharpName (queried_type));
835 return;
836 }
837
838 Report.SymbolRelatedToPreviousError (lookup [0]);
839 ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (lookup [0]));
840 }
841
842 /// <summary>
843 /// Returns an expression that can be used to invoke operator true
844 /// on the expression if it exists.
845 /// </summary>
846 static public StaticCallExpr GetOperatorTrue (EmitContext ec, Expression e, Location loc)
847 {
848 return GetOperatorTrueOrFalse (ec, e, true, loc);
849 }
850
851 /// <summary>
852 /// Returns an expression that can be used to invoke operator false
853 /// on the expression if it exists.
854 /// </summary>
855 static public StaticCallExpr GetOperatorFalse (EmitContext ec, Expression e, Location loc)
856 {
857 return GetOperatorTrueOrFalse (ec, e, false, loc);
858 }
859
860 static StaticCallExpr GetOperatorTrueOrFalse (EmitContext ec, Expression e, bool is_true, Location loc)
861 {
862 MethodBase method;
863 Expression operator_group;
864
865 operator_group = MethodLookup (ec, e.Type, is_true ? "op_True" : "op_False", loc);
866 if (operator_group == null)
867 return null;
868
869 ArrayList arguments = new ArrayList ();
870 arguments.Add (new Argument (e, Argument.AType.Expression));
871 method = Invocation.OverloadResolve (
872 ec, (MethodGroupExpr) operator_group, arguments, false, loc);
873
874 if (method == null)
875 return null;
876
877 return new StaticCallExpr ((MethodInfo) method, arguments, loc);
878 }
879
880 /// <summary>
881 /// Resolves the expression `e' into a boolean expression: either through
882 /// an implicit conversion, or through an `operator true' invocation
883 /// </summary>
884 public static Expression ResolveBoolean (EmitContext ec, Expression e, Location loc)
885 {
886 e = e.Resolve (ec);
887 if (e == null)
888 return null;
889
890 if (e.Type == TypeManager.bool_type)
891 return e;
892
893 Expression converted = Convert.ImplicitConversion (ec, e, TypeManager.bool_type, Location.Null);
894
895 if (converted != null)
896 return converted;
897
898 //
899 // If no implicit conversion to bool exists, try using `operator true'
900 //
901 converted = Expression.GetOperatorTrue (ec, e, loc);
902 if (converted == null){
903 e.Error_ValueCannotBeConverted (loc, TypeManager.bool_type, false);
904 return null;
905 }
906 return converted;
907 }
908
909 public virtual string ExprClassName
910 {
911 get {
912 switch (eclass){
913 case ExprClass.Invalid:
914 return "Invalid";
915 case ExprClass.Value:
916 return "value";
917 case ExprClass.Variable:
918 return "variable";
919 case ExprClass.Namespace:
920 return "namespace";
921 case ExprClass.Type:
922 return "type";
923 case ExprClass.MethodGroup:
924 return "method group";
925 case ExprClass.PropertyAccess:
926 return "property access";
927 case ExprClass.EventAccess:
928 return "event access";
929 case ExprClass.IndexerAccess:
930 return "indexer access";
931 case ExprClass.Nothing:
932 return "null";
933 }
934 throw new Exception ("Should not happen");
935 }
936 }
937
938 /// <summary>
939 /// Reports that we were expecting `expr' to be of class `expected'
940 /// </summary>
941 public void Error_UnexpectedKind (DeclSpace ds, string expected, Location loc)
942 {
943 Error_UnexpectedKind (ds, expected, ExprClassName, loc);
944 }
945
946 public void Error_UnexpectedKind (DeclSpace ds, string expected, string was, Location loc)
947 {
948 string name = GetSignatureForError ();
949 if (ds != null)
950 name = ds.GetSignatureForError () + '.' + name;
951
952 Report.Error (118, loc, "`{0}' is a `{1}' but a `{2}' was expected",
953 name, was, expected);
954 }
955
956 public void Error_UnexpectedKind (ResolveFlags flags, Location loc)
957 {
958 string [] valid = new string [4];
959 int count = 0;
960
961 if ((flags & ResolveFlags.VariableOrValue) != 0) {
962 valid [count++] = "variable";
963 valid [count++] = "value";
964 }
965
966 if ((flags & ResolveFlags.Type) != 0)
967 valid [count++] = "type";
968
969 if ((flags & ResolveFlags.MethodGroup) != 0)
970 valid [count++] = "method group";
971
972 if (count == 0)
973 valid [count++] = "unknown";
974
975 StringBuilder sb = new StringBuilder (valid [0]);
976 for (int i = 1; i < count - 1; i++) {
977 sb.Append ("', `");
978 sb.Append (valid [i]);
979 }
980 if (count > 1) {
981 sb.Append ("' or `");
982 sb.Append (valid [count - 1]);
983 }
984
985 Report.Error (119, loc,
986 "Expression denotes a `{0}', where a `{1}' was expected", ExprClassName, sb.ToString ());
987 }
988
989 public static void UnsafeError (Location loc)
990 {
991 Report.Error (214, loc, "Pointers and fixed size buffers may only be used in an unsafe context");
992 }
993
994 //
995 // Load the object from the pointer.
996 //
997 public static void LoadFromPtr (ILGenerator ig, Type t)
998 {
999 if (t == TypeManager.int32_type)
1000 ig.Emit (OpCodes.Ldind_I4);
1001 else if (t == TypeManager.uint32_type)
1002 ig.Emit (OpCodes.Ldind_U4);
1003 else if (t == TypeManager.short_type)
1004 ig.Emit (OpCodes.Ldind_I2);
1005 else if (t == TypeManager.ushort_type)
1006 ig.Emit (OpCodes.Ldind_U2);
1007 else if (t == TypeManager.char_type)
1008 ig.Emit (OpCodes.Ldind_U2);
1009 else if (t == TypeManager.byte_type)
1010 ig.Emit (OpCodes.Ldind_U1);
1011 else if (t == TypeManager.sbyte_type)
1012 ig.Emit (OpCodes.Ldind_I1);
1013 else if (t == TypeManager.uint64_type)
1014 ig.Emit (OpCodes.Ldind_I8);
1015 else if (t == TypeManager.int64_type)
1016 ig.Emit (OpCodes.Ldind_I8);
1017 else if (t == TypeManager.float_type)
1018 ig.Emit (OpCodes.Ldind_R4);
1019 else if (t == TypeManager.double_type)
1020 ig.Emit (OpCodes.Ldind_R8);
1021 else if (t == TypeManager.bool_type)
1022 ig.Emit (OpCodes.Ldind_I1);
1023 else if (t == TypeManager.intptr_type)
1024 ig.Emit (OpCodes.Ldind_I);
1025 else if (TypeManager.IsEnumType (t)) {
1026 if (t == TypeManager.enum_type)
1027 ig.Emit (OpCodes.Ldind_Ref);
1028 else
1029 LoadFromPtr (ig, TypeManager.EnumToUnderlying (t));
1030 } else if (t.IsValueType)
1031 ig.Emit (OpCodes.Ldobj, t);
1032 else if (t.IsPointer)
1033 ig.Emit (OpCodes.Ldind_I);
1034 else
1035 ig.Emit (OpCodes.Ldind_Ref);
1036 }
1037
1038 //
1039 // The stack contains the pointer and the value of type `type'
1040 //
1041 public static void StoreFromPtr (ILGenerator ig, Type type)
1042 {
1043 if (TypeManager.IsEnumType (type))
1044 type = TypeManager.EnumToUnderlying (type);
1045 if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
1046 ig.Emit (OpCodes.Stind_I4);
1047 else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
1048 ig.Emit (OpCodes.Stind_I8);
1049 else if (type == TypeManager.char_type || type == TypeManager.short_type ||
1050 type == TypeManager.ushort_type)
1051 ig.Emit (OpCodes.Stind_I2);
1052 else if (type == TypeManager.float_type)
1053 ig.Emit (OpCodes.Stind_R4);
1054 else if (type == TypeManager.double_type)
1055 ig.Emit (OpCodes.Stind_R8);
1056 else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
1057 type == TypeManager.bool_type)
1058 ig.Emit (OpCodes.Stind_I1);
1059 else if (type == TypeManager.intptr_type)
1060 ig.Emit (OpCodes.Stind_I);
1061 else if (type.IsValueType)
1062 ig.Emit (OpCodes.Stobj, type);
1063 else
1064 ig.Emit (OpCodes.Stind_Ref);
1065 }
1066
1067 //
1068 // Returns the size of type `t' if known, otherwise, 0
1069 //
1070 public static int GetTypeSize (Type t)
1071 {
1072 t = TypeManager.TypeToCoreType (t);
1073 if (t == TypeManager.int32_type ||
1074 t == TypeManager.uint32_type ||
1075 t == TypeManager.float_type)
1076 return 4;
1077 else if (t == TypeManager.int64_type ||
1078 t == TypeManager.uint64_type ||
1079 t == TypeManager.double_type)
1080 return 8;
1081 else if (t == TypeManager.byte_type ||
1082 t == TypeManager.sbyte_type ||
1083 t == TypeManager.bool_type)
1084 return 1;
1085 else if (t == TypeManager.short_type ||
1086 t == TypeManager.char_type ||
1087 t == TypeManager.ushort_type)
1088 return 2;
1089 else if (t == TypeManager.decimal_type)
1090 return 16;
1091 else
1092 return 0;
1093 }
1094
1095 public static void Error_NegativeArrayIndex (Location loc)
1096 {
1097 Report.Error (248, loc, "Cannot create an array with a negative size");
1098 }
1099
1100 protected void Error_CannotCallAbstractBase (string name)
1101 {
1102 Report.Error (205, loc, "Cannot call an abstract base member `{0}'", name);
1103 }
1104
1105 //
1106 // Converts `source' to an int, uint, long or ulong.
1107 //
1108 public Expression ExpressionToArrayArgument (EmitContext ec, Expression source, Location loc)
1109 {
1110 Expression target;
1111
1112 using (ec.With (EmitContext.Flags.CheckState, true)) {
1113 target = Convert.ImplicitConversion (ec, source, TypeManager.int32_type, loc);
1114 if (target == null)
1115 target = Convert.ImplicitConversion (ec, source, TypeManager.uint32_type, loc);
1116 if (target == null)
1117 target = Convert.ImplicitConversion (ec, source, TypeManager.int64_type, loc);
1118 if (target == null)
1119 target = Convert.ImplicitConversion (ec, source, TypeManager.uint64_type, loc);
1120
1121 if (target == null) {
1122 source.Error_ValueCannotBeConverted (loc, TypeManager.int32_type, false);
1123 return null;
1124 }
1125 }
1126
1127 //
1128 // Only positive constants are allowed at compile time
1129 //
1130 if (target is Constant){
1131 if (target is IntConstant){
1132 if (((IntConstant) target).Value < 0){
1133 Error_NegativeArrayIndex (loc);
1134 return null;
1135 }
1136 }
1137
1138 if (target is LongConstant){
1139 if (((LongConstant) target).Value < 0){
1140 Error_NegativeArrayIndex (loc);
1141 return null;
1142 }
1143 }
1144
1145 }
1146
1147 return target;
1148 }
1149
1150 }
1151
1152 /// <summary>
1153 /// This is just a base class for expressions that can
1154 /// appear on statements (invocations, object creation,
1155 /// assignments, post/pre increment and decrement). The idea
1156 /// being that they would support an extra Emition interface that
1157 /// does not leave a result on the stack.
1158 /// </summary>
1159 public abstract class ExpressionStatement : Expression {
1160
1161 public virtual ExpressionStatement ResolveStatement (EmitContext ec)
1162 {
1163 Expression e = Resolve (ec);
1164 if (e == null)
1165 return null;
1166
1167 ExpressionStatement es = e as ExpressionStatement;
1168 if (es == null)
1169 Error (201, "Only assignment, call, increment, decrement and new object " +
1170 "expressions can be used as a statement");
1171
1172 return es;
1173 }
1174
1175 /// <summary>
1176 /// Requests the expression to be emitted in a `statement'
1177 /// context. This means that no new value is left on the
1178 /// stack after invoking this method (constrasted with
1179 /// Emit that will always leave a value on the stack).
1180 /// </summary>
1181 public abstract void EmitStatement (EmitContext ec);
1182 }
1183
1184 /// <summary>
1185 /// This kind of cast is used to encapsulate the child
1186 /// whose type is child.Type into an expression that is
1187 /// reported to return "return_type". This is used to encapsulate
1188 /// expressions which have compatible types, but need to be dealt
1189 /// at higher levels with.
1190 ///
1191 /// For example, a "byte" expression could be encapsulated in one
1192 /// of these as an "unsigned int". The type for the expression
1193 /// would be "unsigned int".
1194 ///
1195 /// </summary>
1196 public class EmptyCast : Expression {
1197 protected readonly Expression child;
1198
1199 public EmptyCast (Expression child, Type return_type)
1200 {
1201 eclass = child.eclass;
1202 loc = child.Location;
1203 type = return_type;
1204 this.child = child;
1205 }
1206
1207 public override Expression DoResolve (EmitContext ec)
1208 {
1209 // This should never be invoked, we are born in fully
1210 // initialized state.
1211
1212 return this;
1213 }
1214
1215 public override void Emit (EmitContext ec)
1216 {
1217 child.Emit (ec);
1218 }
1219
1220 public override bool GetAttributableValue (Type valueType, out object value)
1221 {
1222 return child.GetAttributableValue (valueType, out value);
1223 }
1224
1225 }
1226 /// <summary>
1227 /// This is a numeric cast to a Decimal
1228 /// </summary>
1229 public class CastToDecimal : EmptyCast {
1230
1231 MethodInfo conversion_operator;
1232
1233 public CastToDecimal (Expression child)
1234 : this (child, false)
1235 {
1236 }
1237
1238 public CastToDecimal (Expression child, bool find_explicit)
1239 : base (child, TypeManager.decimal_type)
1240 {
1241 conversion_operator = GetConversionOperator (find_explicit);
1242
1243 if (conversion_operator == null)
1244 throw new InternalErrorException ("Outer conversion routine is out of sync");
1245 }
1246
1247 // Returns the implicit operator that converts from
1248 // 'child.Type' to System.Decimal.
1249 MethodInfo GetConversionOperator (bool find_explicit)
1250 {
1251 string operator_name = find_explicit ? "op_Explicit" : "op_Implicit";
1252
1253 MemberInfo [] mi = TypeManager.MemberLookup (type, type, type, MemberTypes.Method,
1254 BindingFlags.Static | BindingFlags.Public, operator_name, null);
1255
1256 foreach (MethodInfo oper in mi) {
1257 ParameterData pd = TypeManager.GetParameterData (oper);
1258
1259 if (pd.ParameterType (0) == child.Type && oper.ReturnType == type)
1260 return oper;
1261 }
1262
1263 return null;
1264 }
1265 public override void Emit (EmitContext ec)
1266 {
1267 ILGenerator ig = ec.ig;
1268 child.Emit (ec);
1269
1270 ig.Emit (OpCodes.Call, conversion_operator);
1271 }
1272 }
1273
1274 /// <summary>
1275 /// This is an explicit numeric cast from a Decimal
1276 /// </summary>
1277 public class CastFromDecimal : EmptyCast
1278 {
1279 static IDictionary operators;
1280
1281 public CastFromDecimal (Expression child, Type return_type)
1282 : base (child, return_type)
1283 {
1284 if (child.Type != TypeManager.decimal_type)
1285 throw new InternalErrorException (
1286 "The expected type is Decimal, instead it is " + child.Type.FullName);
1287 }
1288
1289 // Returns the explicit operator that converts from an
1290 // express of type System.Decimal to 'type'.
1291 public Expression Resolve ()
1292 {
1293 if (operators == null) {
1294 MemberInfo[] all_oper = TypeManager.MemberLookup (TypeManager.decimal_type,
1295 TypeManager.decimal_type, TypeManager.decimal_type, MemberTypes.Method,
1296 BindingFlags.Static | BindingFlags.Public, "op_Explicit", null);
1297
1298 operators = new System.Collections.Specialized.HybridDictionary ();
1299 foreach (MethodInfo oper in all_oper) {
1300 ParameterData pd = TypeManager.GetParameterData (oper);
1301 if (pd.ParameterType (0) == TypeManager.decimal_type)
1302 operators.Add (oper.ReturnType, oper);
1303 }
1304 }
1305
1306 return operators.Contains (type) ? this : null;
1307 }
1308
1309 public override void Emit (EmitContext ec)
1310 {
1311 ILGenerator ig = ec.ig;
1312 child.Emit (ec);
1313
1314 ig.Emit (OpCodes.Call, (MethodInfo)operators [type]);
1315 }
1316 }
1317
1318 //
1319 // We need to special case this since an empty cast of
1320 // a NullLiteral is still a Constant
1321 //
1322 public class NullCast : Constant {
1323 public Constant child;
1324
1325 public NullCast (Constant child, Type return_type):
1326 base (Location.Null)
1327 {
1328 eclass = child.eclass;
1329 type = return_type;
1330 this.child = child;
1331 }
1332
1333 override public string AsString ()
1334 {
1335 return "null";
1336 }
1337
1338 public override object GetValue ()
1339 {
1340 return null;
1341 }
1342
1343 public override Expression DoResolve (EmitContext ec)
1344 {
1345 // This should never be invoked, we are born in fully
1346 // initialized state.
1347
1348 return this;
1349 }
1350
1351 public override void Emit (EmitContext ec)
1352 {
1353 child.Emit (ec);
1354 }
1355
1356 public override Constant Increment ()
1357 {
1358 throw new NotSupportedException ();
1359 }
1360
1361 public override bool IsDefaultValue {
1362 get {
1363 return true;
1364 }
1365 }
1366
1367 public override bool IsNegative {
1368 get {
1369 return false;
1370 }
1371 }
1372
1373 public override Constant Reduce (bool inCheckedContext, Type target_type)
1374 {
1375 if (type == target_type)
1376 return child.Reduce (inCheckedContext, target_type);
1377
1378 return null;
1379 }
1380
1381 }
1382
1383
1384 /// <summary>
1385 /// This class is used to wrap literals which belong inside Enums
1386 /// </summary>
1387 public class EnumConstant : Constant {
1388 public Constant Child;
1389
1390 public EnumConstant (Constant child, Type enum_type):
1391 base (child.Location)
1392 {
1393 eclass = child.eclass;
1394 this.Child = child;
1395 type = enum_type;
1396 }
1397
1398 public override Expression DoResolve (EmitContext ec)
1399 {
1400 // This should never be invoked, we are born in fully
1401 // initialized state.
1402
1403 return this;
1404 }
1405
1406 public override void Emit (EmitContext ec)
1407 {
1408 Child.Emit (ec);
1409 }
1410
1411 public override bool GetAttributableValue (Type valueType, out object value)
1412 {
1413 value = GetTypedValue ();
1414 return true;
1415 }
1416
1417 public override string GetSignatureForError()
1418 {
1419 return TypeManager.CSharpName (Type);
1420 }
1421
1422 public override object GetValue ()
1423 {
1424 return Child.GetValue ();
1425 }
1426
1427 public override object GetTypedValue ()
1428 {
1429 // FIXME: runtime is not ready to work with just emited enums
1430 if (!RootContext.StdLib) {
1431 return Child.GetValue ();
1432 }
1433
1434 return System.Enum.ToObject (type, Child.GetValue ());
1435 }
1436
1437 public override string AsString ()
1438 {
1439 return Child.AsString ();
1440 }
1441
1442 public override DoubleConstant ConvertToDouble ()
1443 {
1444 return Child.ConvertToDouble ();
1445 }
1446
1447 public override FloatConstant ConvertToFloat ()
1448 {
1449 return Child.ConvertToFloat ();
1450 }
1451
1452 public override ULongConstant ConvertToULong ()
1453 {
1454 return Child.ConvertToULong ();
1455 }
1456
1457 public override LongConstant ConvertToLong ()
1458 {
1459 return Child.ConvertToLong ();
1460 }
1461
1462 public override UIntConstant ConvertToUInt ()
1463 {
1464 return Child.ConvertToUInt ();
1465 }
1466
1467 public override IntConstant ConvertToInt ()
1468 {
1469 return Child.ConvertToInt ();
1470 }
1471
1472 public override Constant Increment()
1473 {
1474 return new EnumConstant (Child.Increment (), type);
1475 }
1476
1477 public override bool IsDefaultValue {
1478 get {
1479 return Child.IsDefaultValue;
1480 }
1481 }
1482
1483 public override bool IsZeroInteger {
1484 get { return Child.IsZeroInteger; }
1485 }
1486
1487 public override bool IsNegative {
1488 get {
1489 return Child.IsNegative;
1490 }
1491 }
1492
1493 public override Constant Reduce(bool inCheckedContext, Type target_type)
1494 {
1495 if (Child.Type == target_type)
1496 return Child;
1497
1498 return Child.Reduce (inCheckedContext, target_type);
1499 }
1500
1501 public override Constant ToType (Type type, Location loc)
1502 {
1503 if (Type == type) {
1504 // This is workaround of mono bug. It can be removed when the latest corlib spreads enough
1505 if (TypeManager.IsEnumType (type.UnderlyingSystemType))
1506 return this;
1507
1508 if (type.UnderlyingSystemType != Child.Type)
1509 Child = Child.ToType (type.UnderlyingSystemType, loc);
1510 return this;
1511 }
1512
1513 if (!Convert.ImplicitStandardConversionExists (this, type)){
1514 Error_ValueCannotBeConverted (loc, type, false);
1515 return null;
1516 }
1517
1518 return Child.ToType (type, loc);
1519 }
1520
1521 }
1522
1523 /// <summary>
1524 /// This kind of cast is used to encapsulate Value Types in objects.
1525 ///
1526 /// The effect of it is to box the value type emitted by the previous
1527 /// operation.
1528 /// </summary>
1529 public class BoxedCast : EmptyCast {
1530
1531 public BoxedCast (Expression expr, Type target_type)
1532 : base (expr, target_type)
1533 {
1534 eclass = ExprClass.Value;
1535 }
1536
1537 public override Expression DoResolve (EmitContext ec)
1538 {
1539 // This should never be invoked, we are born in fully
1540 // initialized state.
1541
1542 return this;
1543 }
1544
1545 public override void Emit (EmitContext ec)
1546 {
1547 base.Emit (ec);
1548
1549 ec.ig.Emit (OpCodes.Box, child.Type);
1550 }
1551 }
1552
1553 public class UnboxCast : EmptyCast {
1554 public UnboxCast (Expression expr, Type return_type)
1555 : base (expr, return_type)
1556 {
1557 }
1558
1559 public override Expression DoResolve (EmitContext ec)
1560 {
1561 // This should never be invoked, we are born in fully
1562 // initialized state.
1563
1564 return this;
1565 }
1566
1567 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
1568 {
1569 if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess)
1570 Report.Error (445, loc, "Cannot modify the result of an unboxing conversion");
1571 return base.DoResolveLValue (ec, right_side);
1572 }
1573
1574 public override void Emit (EmitContext ec)
1575 {
1576 Type t = type;
1577 ILGenerator ig = ec.ig;
1578
1579 base.Emit (ec);
1580 ig.Emit (OpCodes.Unbox, t);
1581
1582 LoadFromPtr (ig, t);
1583 }
1584 }
1585
1586 /// <summary>
1587 /// This is used to perform explicit numeric conversions.
1588 ///
1589 /// Explicit numeric conversions might trigger exceptions in a checked
1590 /// context, so they should generate the conv.ovf opcodes instead of
1591 /// conv opcodes.
1592 /// </summary>
1593 public class ConvCast : EmptyCast {
1594 public enum Mode : byte {
1595 I1_U1, I1_U2, I1_U4, I1_U8, I1_CH,
1596 U1_I1, U1_CH,
1597 I2_I1, I2_U1, I2_U2, I2_U4, I2_U8, I2_CH,
1598 U2_I1, U2_U1, U2_I2, U2_CH,
1599 I4_I1, I4_U1, I4_I2, I4_U2, I4_U4, I4_U8, I4_CH,
1600 U4_I1, U4_U1, U4_I2, U4_U2, U4_I4, U4_CH,
1601 I8_I1, I8_U1, I8_I2, I8_U2, I8_I4, I8_U4, I8_U8, I8_CH,
1602 U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH,
1603 CH_I1, CH_U1, CH_I2,
1604 R4_I1, R4_U1, R4_I2, R4_U2, R4_I4, R4_U4, R4_I8, R4_U8, R4_CH,
1605 R8_I1, R8_U1, R8_I2, R8_U2, R8_I4, R8_U4, R8_I8, R8_U8, R8_CH, R8_R4
1606 }
1607
1608 Mode mode;
1609
1610 public ConvCast (Expression child, Type return_type, Mode m)
1611 : base (child, return_type)
1612 {
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 (ec.CheckState){
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 formed of a single word and only happen at the beginning
1870 /// of a dotted-name.
1871 /// </summary>
1872 public class SimpleName : Expression {
1873 public string Name;
1874 bool in_transit;
1875
1876 public SimpleName (string name, Location l)
1877 {
1878 Name = name;
1879 loc = l;
1880 }
1881
1882 public static void Error_ObjectRefRequired (EmitContext ec, Location l, string name)
1883 {
1884 if (ec.IsFieldInitializer)
1885 Report.Error (236, l,
1886 "A field initializer cannot reference the nonstatic field, method, or property `{0}'",
1887 name);
1888 else
1889 Report.Error (
1890 120, l, "`{0}': An object reference is required for the nonstatic field, method or property",
1891 name);
1892 }
1893
1894 public bool IdenticalNameAndTypeName (EmitContext ec, Expression resolved_to, Location loc)
1895 {
1896 return resolved_to != null && resolved_to.Type != null &&
1897 resolved_to.Type.Name == Name &&
1898 (ec.DeclContainer.LookupType (Name, loc, /* ignore_cs0104 = */ true) != null);
1899 }
1900
1901 public override Expression DoResolve (EmitContext ec)
1902 {
1903 return SimpleNameResolve (ec, null, false);
1904 }
1905
1906 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
1907 {
1908 return SimpleNameResolve (ec, right_side, false);
1909 }
1910
1911
1912 public Expression DoResolve (EmitContext ec, bool intermediate)
1913 {
1914 return SimpleNameResolve (ec, null, intermediate);
1915 }
1916
1917 public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
1918 {
1919 int errors = Report.Errors;
1920 FullNamedExpression fne = ec.DeclContainer.LookupType (Name, loc, /*ignore_cs0104=*/ false);
1921 if (fne != null)
1922 return fne;
1923
1924 if (silent || errors != Report.Errors)
1925 return null;
1926
1927 MemberCore mc = ec.DeclContainer.GetDefinition (Name);
1928 if (mc != null) {
1929 Error_UnexpectedKind (ec.DeclContainer, "type", GetMemberType (mc), loc);
1930 return null;
1931 }
1932
1933 string ns = ec.DeclContainer.NamespaceEntry.NS.Name;
1934 string fullname = (ns.Length > 0) ? ns + "." + Name : Name;
1935 foreach (Assembly a in RootNamespace.Global.Assemblies) {
1936 Type type = a.GetType (fullname);
1937 if (type != null) {
1938 Report.SymbolRelatedToPreviousError (type);
1939 Expression.ErrorIsInaccesible (loc, fullname);
1940 return null;
1941 }
1942 }
1943
1944 NamespaceEntry.Error_NamespaceNotFound (loc, Name);
1945 return null;
1946 }
1947
1948 // TODO: I am still not convinced about this. If someone else will need it
1949 // implement this as virtual property in MemberCore hierarchy
1950 string GetMemberType (MemberCore mc)
1951 {
1952 if (mc is PropertyBase)
1953 return "property";
1954 if (mc is Indexer)
1955 return "indexer";
1956 if (mc is FieldBase)
1957 return "field";
1958 if (mc is MethodCore)
1959 return "method";
1960 if (mc is EnumMember)
1961 return "enum";
1962
1963 return "type";
1964 }
1965
1966 Expression SimpleNameResolve (EmitContext ec, Expression right_side, bool intermediate)
1967 {
1968 if (in_transit)
1969 return null;
1970 in_transit = true;
1971
1972 Expression e = DoSimpleNameResolve (ec, right_side, intermediate);
1973 if (e == null)
1974 return null;
1975
1976 if (ec.CurrentBlock == null || ec.CurrentBlock.CheckInvariantMeaningInBlock (Name, e, Location))
1977 return e;
1978
1979 return null;
1980 }
1981
1982 /// <remarks>
1983 /// 7.5.2: Simple Names.
1984 ///
1985 /// Local Variables and Parameters are handled at
1986 /// parse time, so they never occur as SimpleNames.
1987 ///
1988 /// The `intermediate' flag is used by MemberAccess only
1989 /// and it is used to inform us that it is ok for us to
1990 /// avoid the static check, because MemberAccess might end
1991 /// up resolving the Name as a Type name and the access as
1992 /// a static type access.
1993 ///
1994 /// ie: Type Type; .... { Type.GetType (""); }
1995 ///
1996 /// Type is both an instance variable and a Type; Type.GetType
1997 /// is the static method not an instance method of type.
1998 /// </remarks>
1999 Expression DoSimpleNameResolve (EmitContext ec, Expression right_side, bool intermediate)
2000 {
2001 Expression e = null;
2002
2003 //
2004 // Stage 1: Performed by the parser (binding to locals or parameters).
2005 //
2006 Block current_block = ec.CurrentBlock;
2007 if (current_block != null){
2008 LocalInfo vi = current_block.GetLocalInfo (Name);
2009 if (vi != null){
2010 LocalVariableReference var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
2011 if (right_side != null) {
2012 return var.ResolveLValue (ec, right_side, loc);
2013 } else {
2014 ResolveFlags rf = ResolveFlags.VariableOrValue;
2015 if (intermediate)
2016 rf |= ResolveFlags.DisableFlowAnalysis;
2017 return var.Resolve (ec, rf);
2018 }
2019 }
2020
2021 ParameterReference pref = current_block.Toplevel.GetParameterReference (Name, loc);
2022 if (pref != null) {
2023 if (right_side != null)
2024 return pref.ResolveLValue (ec, right_side, loc);
2025 else
2026 return pref.Resolve (ec);
2027 }
2028 }
2029
2030 //
2031 // Stage 2: Lookup members
2032 //
2033
2034 DeclSpace lookup_ds = ec.DeclContainer;
2035 Type almost_matched_type = null;
2036 ArrayList almost_matched = null;
2037 do {
2038 if (lookup_ds.TypeBuilder == null)
2039 break;
2040
2041 e = MemberLookup (ec.ContainerType, lookup_ds.TypeBuilder, Name, loc);
2042 if (e != null)
2043 break;
2044
2045 if (almost_matched == null && almostMatchedMembers.Count > 0) {
2046 almost_matched_type = lookup_ds.TypeBuilder;
2047 almost_matched = (ArrayList) almostMatchedMembers.Clone ();
2048 }
2049
2050 lookup_ds =lookup_ds.Parent;
2051 } while (lookup_ds != null);
2052
2053 if (e == null && ec.ContainerType != null)
2054 e = MemberLookup (ec.ContainerType, ec.ContainerType, Name, loc);
2055
2056 if (e == null) {
2057 if (almost_matched == null && almostMatchedMembers.Count > 0) {
2058 almost_matched_type = ec.ContainerType;
2059 almost_matched = (ArrayList) almostMatchedMembers.Clone ();
2060 }
2061 e = ResolveAsTypeStep (ec, true);
2062 }
2063
2064 if (e == null) {
2065 if (almost_matched != null)
2066 almostMatchedMembers = almost_matched;
2067 if (almost_matched_type == null)
2068 almost_matched_type = ec.ContainerType;
2069 MemberLookupFailed (ec.ContainerType, null, almost_matched_type, ((SimpleName) this).Name, ec.DeclContainer.Name, true, loc);
2070 return null;
2071 }
2072
2073 if (e is TypeExpr)
2074 return e;
2075
2076 if (e is MemberExpr) {
2077 MemberExpr me = (MemberExpr) e;
2078
2079 Expression left;
2080 if (me.IsInstance) {
2081 if (ec.IsStatic || ec.IsFieldInitializer) {
2082 //
2083 // Note that an MemberExpr can be both IsInstance and IsStatic.
2084 // An unresolved MethodGroupExpr can contain both kinds of methods
2085 // and each predicate is true if the MethodGroupExpr contains
2086 // at least one of that kind of method.
2087 //
2088
2089 if (!me.IsStatic &&
2090 (!intermediate || !IdenticalNameAndTypeName (ec, me, loc))) {
2091 Error_ObjectRefRequired (ec, loc, me.GetSignatureForError ());
2092 return EmptyExpression.Null;
2093 }
2094
2095 //
2096 // Pass the buck to MemberAccess and Invocation.
2097 //
2098 left = EmptyExpression.Null;
2099 } else {
2100 left = ec.GetThis (loc);
2101 }
2102 } else {
2103 left = new TypeExpression (ec.ContainerType, loc);
2104 }
2105
2106 e = me.ResolveMemberAccess (ec, left, loc, null);
2107 if (e == null)
2108 return null;
2109
2110 me = e as MemberExpr;
2111 if (me == null)
2112 return e;
2113
2114 if (!me.IsStatic &&
2115 TypeManager.IsNestedFamilyAccessible (me.InstanceExpression.Type, me.DeclaringType) &&
2116 me.InstanceExpression.Type != me.DeclaringType &&
2117 !me.InstanceExpression.Type.IsSubclassOf (me.DeclaringType) &&
2118 (!intermediate || !IdenticalNameAndTypeName (ec, e, loc))) {
2119 Report.Error (38, loc, "Cannot access a nonstatic member of outer type `{0}' via nested type `{1}'",
2120 TypeManager.CSharpName (me.DeclaringType), TypeManager.CSharpName (me.InstanceExpression.Type));
2121 return null;
2122 }
2123
2124 return (right_side != null)
2125 ? me.DoResolveLValue (ec, right_side)
2126 : me.DoResolve (ec);
2127 }
2128
2129 return e;
2130 }
2131
2132 public override void Emit (EmitContext ec)
2133 {
2134 //
2135 // If this is ever reached, then we failed to
2136 // find the name as a namespace
2137 //
2138
2139 Error (103, "The name `" + Name +
2140 "' does not exist in the class `" +
2141 ec.DeclContainer.Name + "'");
2142 }
2143
2144 public override string ToString ()
2145 {
2146 return Name;
2147 }
2148
2149 public override string GetSignatureForError ()
2150 {
2151 return Name;
2152 }
2153 }
2154
2155 /// <summary>
2156 /// Represents a namespace or a type. The name of the class was inspired by
2157 /// section 10.8.1 (Fully Qualified Names).
2158 /// </summary>
2159 public abstract class FullNamedExpression : Expression {
2160 public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
2161 {
2162 return this;
2163 }
2164
2165 public abstract string FullName {
2166 get;
2167 }
2168 }
2169
2170 /// <summary>
2171 /// Expression that evaluates to a type
2172 /// </summary>
2173 public abstract class TypeExpr : FullNamedExpression {
2174 override public FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
2175 {
2176 TypeExpr t = DoResolveAsTypeStep (ec);
2177 if (t == null)
2178 return null;
2179
2180 eclass = ExprClass.Type;
2181 return t;
2182 }
2183
2184 override public Expression DoResolve (EmitContext ec)
2185 {
2186 return ResolveAsTypeTerminal (ec, false);
2187 }
2188
2189 override public void Emit (EmitContext ec)
2190 {
2191 throw new Exception ("Should never be called");
2192 }
2193
2194 public virtual bool CheckAccessLevel (DeclSpace ds)
2195 {
2196 return ds.CheckAccessLevel (Type);
2197 }
2198
2199 public virtual bool AsAccessible (DeclSpace ds, int flags)
2200 {
2201 return ds.AsAccessible (Type, flags);
2202 }
2203
2204 public virtual bool IsClass {
2205 get { return Type.IsClass; }
2206 }
2207
2208 public virtual bool IsValueType {
2209 get { return Type.IsValueType; }
2210 }
2211
2212 public virtual bool IsInterface {
2213 get { return Type.IsInterface; }
2214 }
2215
2216 public virtual bool IsSealed {
2217 get { return Type.IsSealed; }
2218 }
2219
2220 public virtual bool CanInheritFrom ()
2221 {
2222 if (Type == TypeManager.enum_type ||
2223 (Type == TypeManager.value_type && RootContext.StdLib) ||
2224 Type == TypeManager.multicast_delegate_type ||
2225 Type == TypeManager.delegate_type ||
2226 Type == TypeManager.array_type)
2227 return false;
2228
2229 return true;
2230 }
2231
2232 protected abstract TypeExpr DoResolveAsTypeStep (IResolveContext ec);
2233
2234 public abstract string Name {
2235 get;
2236 }
2237
2238 public override bool Equals (object obj)
2239 {
2240 TypeExpr tobj = obj as TypeExpr;
2241 if (tobj == null)
2242 return false;
2243
2244 return Type == tobj.Type;
2245 }
2246
2247 public override int GetHashCode ()
2248 {
2249 return Type.GetHashCode ();
2250 }
2251
2252 public override string ToString ()
2253 {
2254 return Name;
2255 }
2256 }
2257
2258 /// <summary>
2259 /// Fully resolved Expression that already evaluated to a type
2260 /// </summary>
2261 public class TypeExpression : TypeExpr {
2262 public TypeExpression (Type t, Location l)
2263 {
2264 Type = t;
2265 eclass = ExprClass.Type;
2266 loc = l;
2267 }
2268
2269 protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
2270 {
2271 return this;
2272 }
2273
2274 public override TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
2275 {
2276 return this;
2277 }
2278
2279 public override string Name {
2280 get { return Type.ToString (); }
2281 }
2282
2283 public override string FullName {
2284 get { return Type.FullName; }
2285 }
2286 }
2287
2288 /// <summary>
2289 /// Used to create types from a fully qualified name. These are just used
2290 /// by the parser to setup the core types. A TypeLookupExpression is always
2291 /// classified as a type.
2292 /// </summary>
2293 public sealed class TypeLookupExpression : TypeExpr {
2294 readonly string name;
2295
2296 public TypeLookupExpression (string name)
2297 {
2298 this.name = name;
2299 eclass = ExprClass.Type;
2300 }
2301
2302 public override TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
2303 {
2304 // It's null for corlib compilation only
2305 if (type == null)
2306 return DoResolveAsTypeStep (ec);
2307
2308 return this;
2309 }
2310
2311 static readonly char [] dot_array = { '.' };
2312 protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
2313 {
2314 // If name is of the form `N.I', first lookup `N', then search a member `I' in it.
2315 string rest = null;
2316 string lookup_name = name;
2317 int pos = name.IndexOf ('.');
2318 if (pos >= 0) {
2319 rest = name.Substring (pos + 1);
2320 lookup_name = name.Substring (0, pos);
2321 }
2322
2323 FullNamedExpression resolved = RootNamespace.Global.Lookup (ec.DeclContainer, lookup_name, Location.Null);
2324
2325 if (resolved != null && rest != null) {
2326 // Now handle the rest of the the name.
2327 string [] elements = rest.Split (dot_array);
2328 string element;
2329 int count = elements.Length;
2330 int i = 0;
2331 while (i < count && resolved != null && resolved is Namespace) {
2332 Namespace ns = resolved as Namespace;
2333 element = elements [i++];
2334 lookup_name += "." + element;
2335 resolved = ns.Lookup (ec.DeclContainer, element, Location.Null);
2336 }
2337
2338 if (resolved != null && resolved is TypeExpr) {
2339 Type t = ((TypeExpr) resolved).Type;
2340 while (t != null) {
2341 if (!ec.DeclContainer.CheckAccessLevel (t)) {
2342 resolved = null;
2343 lookup_name = t.FullName;
2344 break;
2345 }
2346 if (i == count) {
2347 type = t;
2348 return this;
2349 }
2350 t = TypeManager.GetNestedType (t, elements [i++]);
2351 }
2352 }
2353 }
2354
2355 if (resolved == null) {
2356 NamespaceEntry.Error_NamespaceNotFound (loc, lookup_name);
2357 return null;
2358 }
2359
2360 if (!(resolved is TypeExpr)) {
2361 resolved.Error_UnexpectedKind (ec.DeclContainer, "type", loc);
2362 return null;
2363 }
2364
2365 type = resolved.Type;
2366 return this;
2367 }
2368
2369 public override string Name {
2370 get { return name; }
2371 }
2372
2373 public override string FullName {
2374 get { return name; }
2375 }
2376 }
2377
2378 public class TypeAliasExpression : TypeExpr {
2379 TypeExpr texpr;
2380
2381 public TypeAliasExpression (TypeExpr texpr, Location l)
2382 {
2383 this.texpr = texpr;
2384 loc = texpr.Location;
2385
2386 eclass = ExprClass.Type;
2387 }
2388
2389 public override string Name {
2390 get { return texpr.Name; }
2391 }
2392
2393 public override string FullName {
2394 get { return texpr.FullName; }
2395 }
2396
2397 protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
2398 {
2399 return texpr;
2400 }
2401
2402 public override bool CheckAccessLevel (DeclSpace ds)
2403 {
2404 return texpr.CheckAccessLevel (ds);
2405 }
2406
2407 public override bool AsAccessible (DeclSpace ds, int flags)
2408 {
2409 return texpr.AsAccessible (ds, flags);
2410 }
2411
2412 public override bool IsClass {
2413 get { return texpr.IsClass; }
2414 }
2415
2416 public override bool IsValueType {
2417 get { return texpr.IsValueType; }
2418 }
2419
2420 public override bool IsInterface {
2421 get { return texpr.IsInterface; }
2422 }
2423
2424 public override bool IsSealed {
2425 get { return texpr.IsSealed; }
2426 }
2427 }
2428
2429 /// <summary>
2430 /// This class denotes an expression which evaluates to a member
2431 /// of a struct or a class.
2432 /// </summary>
2433 public abstract class MemberExpr : Expression
2434 {
2435 /// <summary>
2436 /// The name of this member.
2437 /// </summary>
2438 public abstract string Name {
2439 get;
2440 }
2441
2442 /// <summary>
2443 /// Whether this is an instance member.
2444 /// </summary>
2445 public abstract bool IsInstance {
2446 get;
2447 }
2448
2449 /// <summary>
2450 /// Whether this is a static member.
2451 /// </summary>
2452 public abstract bool IsStatic {
2453 get;
2454 }
2455
2456 /// <summary>
2457 /// The type which declares this member.
2458 /// </summary>
2459 public abstract Type DeclaringType {
2460 get;
2461 }
2462
2463 /// <summary>
2464 /// The instance expression associated with this member, if it's a
2465 /// non-static member.
2466 /// </summary>
2467 public Expression InstanceExpression;
2468
2469 public static void error176 (Location loc, string name)
2470 {
2471 Report.Error (176, loc, "Static member `{0}' cannot be accessed " +
2472 "with an instance reference, qualify it with a type name instead", name);
2473 }
2474
2475 // TODO: possible optimalization
2476 // Cache resolved constant result in FieldBuilder <-> expression map
2477 public virtual Expression ResolveMemberAccess (EmitContext ec, Expression left, Location loc,
2478 SimpleName original)
2479 {
2480 //
2481 // Precondition:
2482 // original == null || original.Resolve (...) ==> left
2483 //
2484
2485 if (left is TypeExpr) {
2486 if (!IsStatic) {
2487 SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
2488 return null;
2489 }
2490
2491 return this;
2492 }
2493
2494 if (!IsInstance) {
2495 if (original != null && original.IdenticalNameAndTypeName (ec, left, loc))
2496 return this;
2497
2498 error176 (loc, GetSignatureForError ());
2499 return null;
2500 }
2501
2502 InstanceExpression = left;
2503
2504 return this;
2505 }
2506
2507 protected void EmitInstance (EmitContext ec, bool prepare_for_load)
2508 {
2509 if (IsStatic)
2510 return;
2511
2512 if (InstanceExpression == EmptyExpression.Null) {
2513 SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
2514 return;
2515 }
2516
2517 if (InstanceExpression.Type.IsValueType) {
2518 if (InstanceExpression is IMemoryLocation) {
2519 ((IMemoryLocation) InstanceExpression).AddressOf (ec, AddressOp.LoadStore);
2520 } else {
2521 LocalTemporary t = new LocalTemporary (InstanceExpression.Type);
2522 InstanceExpression.Emit (ec);
2523 t.Store (ec);
2524 t.AddressOf (ec, AddressOp.Store);
2525 }
2526 } else
2527 InstanceExpression.Emit (ec);
2528
2529 if (prepare_for_load)
2530 ec.ig.Emit (OpCodes.Dup);
2531 }
2532 }
2533
2534 /// <summary>
2535 /// MethodGroup Expression.
2536 ///
2537 /// This is a fully resolved expression that evaluates to a type
2538 /// </summary>
2539 public class MethodGroupExpr : MemberExpr {
2540 public MethodBase [] Methods;
2541 bool identical_type_name = false;
2542 bool is_base;
2543
2544 public MethodGroupExpr (MemberInfo [] mi, Location l)
2545 {
2546 Methods = new MethodBase [mi.Length];
2547 mi.CopyTo (Methods, 0);
2548 eclass = ExprClass.MethodGroup;
2549 type = TypeManager.object_type;
2550 loc = l;
2551 }
2552
2553 public MethodGroupExpr (ArrayList list, Location l)
2554 {
2555 Methods = new MethodBase [list.Count];
2556
2557 try {
2558 list.CopyTo (Methods, 0);
2559 } catch {
2560 foreach (MemberInfo m in list){
2561 if (!(m is MethodBase)){
2562 Console.WriteLine ("Name " + m.Name);
2563 Console.WriteLine ("Found a: " + m.GetType ().FullName);
2564 }
2565 }
2566 throw;
2567 }
2568
2569 loc = l;
2570 eclass = ExprClass.MethodGroup;
2571 type = TypeManager.object_type;
2572 }
2573
2574 public override Type DeclaringType {
2575 get {
2576 //
2577 // The methods are arranged in this order:
2578 // derived type -> base type
2579 //
2580 return Methods [0].DeclaringType;
2581 }
2582 }
2583
2584 public bool IdenticalTypeName {
2585 get {
2586 return identical_type_name;
2587 }
2588
2589 set {
2590 identical_type_name = value;
2591 }
2592 }
2593
2594 public bool IsBase {
2595 get {
2596 return is_base;
2597 }
2598 set {
2599 is_base = value;
2600 }
2601 }
2602
2603 public override string GetSignatureForError ()
2604 {
2605 return TypeManager.CSharpSignature (Methods [0]);
2606 }
2607
2608 public override string Name {
2609 get {
2610 return Methods [0].Name;
2611 }
2612 }
2613
2614 public override bool IsInstance {
2615 get {
2616 foreach (MethodBase mb in Methods)
2617 if (!mb.IsStatic)
2618 return true;
2619
2620 return false;
2621 }
2622 }
2623
2624 public override bool IsStatic {
2625 get {
2626 foreach (MethodBase mb in Methods)
2627 if (mb.IsStatic)
2628 return true;
2629
2630 return false;
2631 }
2632 }
2633
2634 public override Expression ResolveMemberAccess (EmitContext ec, Expression left, Location loc,
2635 SimpleName original)
2636 {
2637 if (!(left is TypeExpr) &&
2638 original != null && original.IdenticalNameAndTypeName (ec, left, loc))
2639 IdenticalTypeName = true;
2640
2641 return base.ResolveMemberAccess (ec, left, loc, original);
2642 }
2643
2644 override public Expression DoResolve (EmitContext ec)
2645 {
2646 if (!IsInstance)
2647 InstanceExpression = null;
2648
2649 if (InstanceExpression != null) {
2650 InstanceExpression = InstanceExpression.DoResolve (ec);
2651 if (InstanceExpression == null)
2652 return null;
2653 }
2654
2655 return this;
2656 }
2657
2658 public void ReportUsageError ()
2659 {
2660 Report.Error (654, loc, "Method `" + DeclaringType + "." +
2661 Name + "()' is referenced without parentheses");
2662 }
2663
2664 override public void Emit (EmitContext ec)
2665 {
2666 ReportUsageError ();
2667 }
2668
2669 bool RemoveMethods (bool keep_static)
2670 {
2671 ArrayList smethods = new ArrayList ();
2672
2673 foreach (MethodBase mb in Methods){
2674 if (mb.IsStatic == keep_static)
2675 smethods.Add (mb);
2676 }
2677
2678 if (smethods.Count == 0)
2679 return false;
2680
2681 Methods = new MethodBase [smethods.Count];
2682 smethods.CopyTo (Methods, 0);
2683
2684 return true;
2685 }
2686
2687 /// <summary>
2688 /// Removes any instance methods from the MethodGroup, returns
2689 /// false if the resulting set is empty.
2690 /// </summary>
2691 public bool RemoveInstanceMethods ()
2692 {
2693 return RemoveMethods (true);
2694 }
2695
2696 /// <summary>
2697 /// Removes any static methods from the MethodGroup, returns
2698 /// false if the resulting set is empty.
2699 /// </summary>
2700 public bool RemoveStaticMethods ()
2701 {
2702 return RemoveMethods (false);
2703 }
2704 }
2705
2706 /// <summary>
2707 /// Fully resolved expression that evaluates to a Field
2708 /// </summary>
2709 public class FieldExpr : MemberExpr, IAssignMethod, IMemoryLocation, IVariable {
2710 public readonly FieldInfo FieldInfo;
2711 VariableInfo variable_info;
2712
2713 LocalTemporary temp;
2714 bool prepared;
2715 bool in_initializer;
2716
2717 public FieldExpr (FieldInfo fi, Location l, bool in_initializer):
2718 this (fi, l)
2719 {
2720 this.in_initializer = in_initializer;
2721 }
2722
2723 public FieldExpr (FieldInfo fi, Location l)
2724 {
2725 FieldInfo = fi;
2726 eclass = ExprClass.Variable;
2727 type = fi.FieldType;
2728 loc = l;
2729 }
2730
2731 public override string Name {
2732 get {
2733 return FieldInfo.Name;
2734 }
2735 }
2736
2737 public override bool IsInstance {
2738 get {
2739 return !FieldInfo.IsStatic;
2740 }
2741 }
2742
2743 public override bool IsStatic {
2744 get {
2745 return FieldInfo.IsStatic;
2746 }
2747 }
2748
2749 public override Type DeclaringType {
2750 get {
2751 return FieldInfo.DeclaringType;
2752 }
2753 }
2754
2755 public override string GetSignatureForError ()
2756 {
2757 return TypeManager.GetFullNameSignature (FieldInfo);
2758 }
2759
2760 public VariableInfo VariableInfo {
2761 get {
2762 return variable_info;
2763 }
2764 }
2765
2766 public override Expression ResolveMemberAccess (EmitContext ec, Expression left, Location loc,
2767 SimpleName original)
2768 {
2769 Type t = FieldInfo.FieldType;
2770
2771 if (FieldInfo.IsLiteral || (FieldInfo.IsInitOnly && t == TypeManager.decimal_type)) {
2772 IConstant ic = TypeManager.GetConstant (FieldInfo);
2773 if (ic == null) {
2774 if (FieldInfo.IsLiteral) {
2775 ic = new ExternalConstant (FieldInfo);
2776 } else {
2777 ic = ExternalConstant.CreateDecimal (FieldInfo);
2778 if (ic == null) {
2779 return base.ResolveMemberAccess (ec, left, loc, original);
2780 }
2781 }
2782 TypeManager.RegisterConstant (FieldInfo, ic);
2783 }
2784
2785 bool left_is_type = left is TypeExpr;
2786 if (!left_is_type && (original == null || !original.IdenticalNameAndTypeName (ec, left, loc))) {
2787 Report.SymbolRelatedToPreviousError (FieldInfo);
2788 error176 (loc, TypeManager.GetFullNameSignature (FieldInfo));
2789 return null;
2790 }
2791
2792 if (ic.ResolveValue ()) {
2793 if (!ec.IsInObsoleteScope)
2794 ic.CheckObsoleteness (loc);
2795 }
2796
2797 return ic.Value;
2798 }
2799
2800 if (t.IsPointer && !ec.InUnsafe) {
2801 UnsafeError (loc);
2802 return null;
2803 }
2804
2805 return base.ResolveMemberAccess (ec, left, loc, original);
2806 }
2807
2808 override public Expression DoResolve (EmitContext ec)
2809 {
2810 return DoResolve (ec, false, false);
2811 }
2812
2813 Expression DoResolve (EmitContext ec, bool lvalue_instance, bool out_access)
2814 {
2815 if (!FieldInfo.IsStatic){
2816 if (InstanceExpression == null){
2817 //
2818 // This can happen when referencing an instance field using
2819 // a fully qualified type expression: TypeName.InstanceField = xxx
2820 //
2821 SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
2822 return null;
2823 }
2824
2825 // Resolve the field's instance expression while flow analysis is turned
2826 // off: when accessing a field "a.b", we must check whether the field
2827 // "a.b" is initialized, not whether the whole struct "a" is initialized.
2828
2829 if (lvalue_instance) {
2830 using (ec.With (EmitContext.Flags.DoFlowAnalysis, false)) {
2831 Expression right_side =
2832 out_access ? EmptyExpression.LValueMemberOutAccess : EmptyExpression.LValueMemberAccess;
2833 InstanceExpression = InstanceExpression.ResolveLValue (ec, right_side, loc);
2834 }
2835 } else {
2836 ResolveFlags rf = ResolveFlags.VariableOrValue | ResolveFlags.DisableFlowAnalysis;
2837 InstanceExpression = InstanceExpression.Resolve (ec, rf);
2838 }
2839
2840 if (InstanceExpression == null)
2841 return null;
2842
2843 InstanceExpression.CheckMarshalByRefAccess ();
2844 }
2845
2846 if (!in_initializer && !ec.IsFieldInitializer) {
2847 ObsoleteAttribute oa;
2848 FieldBase f = TypeManager.GetField (FieldInfo);
2849 if (f != null) {
2850 if (!ec.IsInObsoleteScope)
2851 f.CheckObsoleteness (loc);
2852
2853 // To be sure that type is external because we do not register generated fields
2854 } else if (!(FieldInfo.DeclaringType is TypeBuilder)) {
2855 oa = AttributeTester.GetMemberObsoleteAttribute (FieldInfo);
2856 if (oa != null)
2857 AttributeTester.Report_ObsoleteMessage (oa, TypeManager.GetFullNameSignature (FieldInfo), loc);
2858 }
2859 }
2860
2861 AnonymousContainer am = ec.CurrentAnonymousMethod;
2862 if (am != null){
2863 if (!FieldInfo.IsStatic){
2864 if (!am.IsIterator && (ec.TypeContainer is Struct)){
2865 Report.Error (1673, loc,
2866 "Anonymous methods inside structs cannot access instance members of `{0}'. Consider copying `{0}' to a local variable outside the anonymous method and using the local instead",
2867 "this");
2868 return null;
2869 }
2870 if ((am.ContainerAnonymousMethod == null) && (InstanceExpression is This))
2871 ec.CaptureField (this);
2872 }
2873 }
2874
2875 // If the instance expression is a local variable or parameter.
2876 IVariable var = InstanceExpression as IVariable;
2877 if ((var == null) || (var.VariableInfo == null))
2878 return this;
2879
2880 VariableInfo vi = var.VariableInfo;
2881 if (!vi.IsFieldAssigned (ec, FieldInfo.Name, loc))
2882 return null;
2883
2884 variable_info = vi.GetSubStruct (FieldInfo.Name);
2885 return this;
2886 }
2887
2888 static readonly int [] codes = {
2889 191, // instance, write access
2890 192, // instance, out access
2891 198, // static, write access
2892 199, // static, out access
2893 1648, // member of value instance, write access
2894 1649, // member of value instance, out access
2895 1650, // member of value static, write access
2896 1651 // member of value static, out access
2897 };
2898
2899 static readonly string [] msgs = {
2900 /*0191*/ "A readonly field `{0}' cannot be assigned to (except in a constructor or a variable initializer)",
2901 /*0192*/ "A readonly field `{0}' cannot be passed ref or out (except in a constructor)",
2902 /*0198*/ "A static readonly field `{0}' cannot be assigned to (except in a static constructor or a variable initializer)",
2903 /*0199*/ "A static readonly field `{0}' cannot be passed ref or out (except in a static constructor)",
2904 /*1648*/ "Members of readonly field `{0}' cannot be modified (except in a constructor or a variable initializer)",
2905 /*1649*/ "Members of readonly field `{0}' cannot be passed ref or out (except in a constructor)",
2906 /*1650*/ "Fields of static readonly field `{0}' cannot be assigned to (except in a static constructor or a variable initializer)",
2907 /*1651*/ "Fields of static readonly field `{0}' cannot be passed ref or out (except in a static constructor)"
2908 };
2909
2910 // The return value is always null. Returning a value simplifies calling code.
2911 Expression Report_AssignToReadonly (Expression right_side)
2912 {
2913 int i = 0;
2914 if (right_side == EmptyExpression.OutAccess || right_side == EmptyExpression.LValueMemberOutAccess)
2915 i += 1;
2916 if (IsStatic)
2917 i += 2;
2918 if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess)
2919 i += 4;
2920 Report.Error (codes [i], loc, msgs [i], GetSignatureForError ());
2921
2922 return null;
2923 }
2924
2925 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
2926 {
2927 IVariable var = InstanceExpression as IVariable;
2928 if ((var != null) && (var.VariableInfo != null))
2929 var.VariableInfo.SetFieldAssigned (ec, FieldInfo.Name);
2930
2931 bool lvalue_instance = !FieldInfo.IsStatic && FieldInfo.DeclaringType.IsValueType;
2932 bool out_access = right_side == EmptyExpression.OutAccess || right_side == EmptyExpression.LValueMemberOutAccess;
2933
2934 Expression e = DoResolve (ec, lvalue_instance, out_access);
2935
2936 if (e == null)
2937 return null;
2938
2939 FieldBase fb = TypeManager.GetField (FieldInfo);
2940 if (fb != null)
2941 fb.SetAssigned ();
2942
2943 if (FieldInfo.IsInitOnly) {
2944 // InitOnly fields can only be assigned in constructors or initializers
2945 if (!ec.IsFieldInitializer && !ec.IsConstructor)
2946 return Report_AssignToReadonly (right_side);
2947
2948 if (ec.IsConstructor) {
2949 // InitOnly fields cannot be assigned-to in a different constructor from their declaring type
2950 if (ec.ContainerType != FieldInfo.DeclaringType)
2951 return Report_AssignToReadonly (right_side);
2952 // static InitOnly fields cannot be assigned-to in an instance constructor
2953 if (IsStatic && !ec.IsStatic)
2954 return Report_AssignToReadonly (right_side);
2955 // instance constructors can't modify InitOnly fields of other instances of the same type
2956 if (!IsStatic && !(InstanceExpression is This))
2957 return Report_AssignToReadonly (right_side);
2958 }
2959 }
2960
2961 if (right_side == EmptyExpression.OutAccess &&
2962 !IsStatic && !(InstanceExpression is This) && DeclaringType.IsSubclassOf (TypeManager.mbr_type)) {
2963 Report.SymbolRelatedToPreviousError (DeclaringType);
2964 Report.Warning (197, 1, loc,
2965 "Passing `{0}' as ref or out or taking its address may cause a runtime exception because it is a field of a marshal-by-reference class",
2966 GetSignatureForError ());
2967 }
2968
2969 return this;
2970 }
2971
2972 public override void CheckMarshalByRefAccess ()
2973 {
2974 if (!IsStatic && Type.IsValueType && !(InstanceExpression is This) && DeclaringType.IsSubclassOf (TypeManager.mbr_type)) {
2975 Report.SymbolRelatedToPreviousError (DeclaringType);
2976 Report.Warning (1690, 1, loc, "Cannot call methods, properties, or indexers on `{0}' because it is a value type member of a marshal-by-reference class",
2977 GetSignatureForError ());
2978 }
2979 }
2980
2981 public bool VerifyFixed ()
2982 {
2983 IVariable variable = InstanceExpression as IVariable;
2984 // A variable of the form V.I is fixed when V is a fixed variable of a struct type.
2985 // We defer the InstanceExpression check after the variable check to avoid a
2986 // separate null check on InstanceExpression.
2987 return variable != null && InstanceExpression.Type.IsValueType && variable.VerifyFixed ();
2988 }
2989
2990 public override int GetHashCode ()
2991 {
2992 return FieldInfo.GetHashCode ();
2993 }
2994
2995 public override bool Equals (object obj)
2996 {
2997 FieldExpr fe = obj as FieldExpr;
2998 if (fe == null)
2999 return false;
3000
3001 if (FieldInfo != fe.FieldInfo)
3002 return false;
3003
3004 if (InstanceExpression == null || fe.InstanceExpression == null)
3005 return true;
3006
3007 return InstanceExpression.Equals (fe.InstanceExpression);
3008 }
3009
3010 public void Emit (EmitContext ec, bool leave_copy)
3011 {
3012 ILGenerator ig = ec.ig;
3013 bool is_volatile = false;
3014
3015 FieldBase f = TypeManager.GetField (FieldInfo);
3016 if (f != null){
3017 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
3018 is_volatile = true;
3019
3020 f.SetMemberIsUsed ();
3021 }
3022
3023 if (FieldInfo.IsStatic){
3024 if (is_volatile)
3025 ig.Emit (OpCodes.Volatile);
3026
3027 ig.Emit (OpCodes.Ldsfld, FieldInfo);
3028 } else {
3029 if (!prepared)
3030 EmitInstance (ec, false);
3031
3032 if (is_volatile)
3033 ig.Emit (OpCodes.Volatile);
3034
3035 IFixedBuffer ff = AttributeTester.GetFixedBuffer (FieldInfo);
3036 if (ff != null)
3037 {
3038 ig.Emit (OpCodes.Ldflda, FieldInfo);
3039 ig.Emit (OpCodes.Ldflda, ff.Element);
3040 }
3041 else {
3042 ig.Emit (OpCodes.Ldfld, FieldInfo);
3043 }
3044 }
3045
3046 if (leave_copy) {
3047 ec.ig.Emit (OpCodes.Dup);
3048 if (!FieldInfo.IsStatic) {
3049 temp = new LocalTemporary (this.Type);
3050 temp.Store (ec);
3051 }
3052 }
3053 }
3054
3055 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
3056 {
3057 FieldAttributes fa = FieldInfo.Attributes;
3058 bool is_static = (fa & FieldAttributes.Static) != 0;
3059 bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
3060 ILGenerator ig = ec.ig;
3061 prepared = prepare_for_load;
3062
3063 if (is_readonly && !ec.IsConstructor){
3064 Report_AssignToReadonly (source);
3065 return;
3066 }
3067
3068 EmitInstance (ec, prepare_for_load);
3069
3070 source.Emit (ec);
3071 if (leave_copy) {
3072 ec.ig.Emit (OpCodes.Dup);
3073 if (!FieldInfo.IsStatic) {
3074 temp = new LocalTemporary (this.Type);
3075 temp.Store (ec);
3076 }
3077 }
3078
3079 if (FieldInfo is FieldBuilder){
3080 FieldBase f = TypeManager.GetField (FieldInfo);
3081 if (f != null){
3082 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
3083 ig.Emit (OpCodes.Volatile);
3084
3085 f.SetAssigned ();
3086 }
3087 }
3088
3089 if (is_static)
3090 ig.Emit (OpCodes.Stsfld, FieldInfo);
3091 else
3092 ig.Emit (OpCodes.Stfld, FieldInfo);
3093
3094 if (temp != null) {
3095 temp.Emit (ec);
3096 temp.Release (ec);
3097 }
3098 }
3099
3100 public override void Emit (EmitContext ec)
3101 {
3102 Emit (ec, false);
3103 }
3104
3105 public void AddressOf (EmitContext ec, AddressOp mode)
3106 {
3107 ILGenerator ig = ec.ig;
3108
3109 if (FieldInfo is FieldBuilder){
3110 FieldBase f = TypeManager.GetField (FieldInfo);
3111 if (f != null){
3112 if ((f.ModFlags & Modifiers.VOLATILE) != 0){
3113 Report.Warning (420, 1, loc, "`{0}': A volatile fields cannot be passed using a ref or out parameter",
3114 f.GetSignatureForError ());
3115 return;
3116 }
3117
3118 if ((mode & AddressOp.Store) != 0)
3119 f.SetAssigned ();
3120 if ((mode & AddressOp.Load) != 0)
3121 f.SetMemberIsUsed ();
3122 }
3123 }
3124
3125 //
3126 // Handle initonly fields specially: make a copy and then
3127 // get the address of the copy.
3128 //
3129 bool need_copy;
3130 if (FieldInfo.IsInitOnly){
3131 need_copy = true;
3132 if (ec.IsConstructor){
3133 if (FieldInfo.IsStatic){
3134 if (ec.IsStatic)
3135 need_copy = false;
3136 } else
3137 need_copy = false;
3138 }
3139 } else
3140 need_copy = false;
3141
3142 if (need_copy){
3143 LocalBuilder local;
3144 Emit (ec);
3145 local = ig.DeclareLocal (type);
3146 ig.Emit (OpCodes.Stloc, local);
3147 ig.Emit (OpCodes.Ldloca, local);
3148 return;
3149 }
3150
3151
3152 if (FieldInfo.IsStatic){
3153 ig.Emit (OpCodes.Ldsflda, FieldInfo);
3154 } else {
3155 EmitInstance (ec, false);
3156 ig.Emit (OpCodes.Ldflda, FieldInfo);
3157 }
3158 }
3159 }
3160
3161 //
3162 // A FieldExpr whose address can not be taken
3163 //
3164 public class FieldExprNoAddress : FieldExpr, IMemoryLocation {
3165 public FieldExprNoAddress (FieldInfo fi, Location loc) : base (fi, loc)
3166 {
3167 }
3168
3169 public new void AddressOf (EmitContext ec, AddressOp mode)
3170 {
3171 Report.Error (-215, "Report this: Taking the address of a remapped parameter not supported");
3172 }
3173 }
3174
3175 /// <summary>
3176 /// Expression that evaluates to a Property. The Assign class
3177 /// might set the `Value' expression if we are in an assignment.
3178 ///
3179 /// This is not an LValue because we need to re-write the expression, we
3180 /// can not take data from the stack and store it.
3181 /// </summary>
3182 public class PropertyExpr : MemberExpr, IAssignMethod {
3183 public readonly PropertyInfo PropertyInfo;
3184
3185 //
3186 // This is set externally by the `BaseAccess' class
3187 //
3188 public bool IsBase;
3189 MethodInfo getter, setter;
3190 bool is_static;
3191
3192 bool resolved;
3193
3194 LocalTemporary temp;
3195 bool prepared;
3196
3197 internal static PtrHashtable AccessorTable = new PtrHashtable ();
3198
3199 public PropertyExpr (Type containerType, PropertyInfo pi, Location l)
3200 {
3201 PropertyInfo = pi;
3202 eclass = ExprClass.PropertyAccess;
3203 is_static = false;
3204 loc = l;
3205
3206 type = TypeManager.TypeToCoreType (pi.PropertyType);
3207
3208 ResolveAccessors (containerType);
3209 }
3210
3211 public override string Name {
3212 get {
3213 return PropertyInfo.Name;
3214 }
3215 }
3216
3217 public override bool IsInstance {
3218 get {
3219 return !is_static;
3220 }
3221 }
3222
3223 public override bool IsStatic {
3224 get {
3225 return is_static;
3226 }
3227 }
3228
3229 public override Type DeclaringType {
3230 get {
3231 return PropertyInfo.DeclaringType;
3232 }
3233 }
3234
3235 public override string GetSignatureForError ()
3236 {
3237 return TypeManager.GetFullNameSignature (PropertyInfo);
3238 }
3239
3240 void FindAccessors (Type invocation_type)
3241 {
3242 const BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic |
3243 BindingFlags.Static | BindingFlags.Instance |
3244 BindingFlags.DeclaredOnly;
3245
3246 Type current = PropertyInfo.DeclaringType;
3247 for (; current != null; current = current.BaseType) {
3248 MemberInfo[] group = TypeManager.MemberLookup (
3249 invocation_type, invocation_type, current,
3250 MemberTypes.Property, flags, PropertyInfo.Name, null);
3251
3252 if (group == null)
3253 continue;
3254
3255 if (group.Length != 1)
3256 // Oooops, can this ever happen ?
3257 return;
3258
3259 PropertyInfo pi = (PropertyInfo) group [0];
3260
3261 if (getter == null)
3262 getter = pi.GetGetMethod (true);
3263
3264 if (setter == null)
3265 setter = pi.GetSetMethod (true);
3266
3267 MethodInfo accessor = getter != null ? getter : setter;
3268
3269 if (!accessor.IsVirtual)
3270 return;
3271 }
3272 }
3273
3274 //
3275 // We also perform the permission checking here, as the PropertyInfo does not
3276 // hold the information for the accessibility of its setter/getter
3277 //
3278 // TODO: can use TypeManager.GetProperty to boost performance
3279 void ResolveAccessors (Type containerType)
3280 {
3281 FindAccessors (containerType);
3282
3283 if (getter != null) {
3284 IMethodData md = TypeManager.GetMethod (getter);
3285 if (md != null)
3286 md.SetMemberIsUsed ();
3287
3288 AccessorTable [getter] = PropertyInfo;
3289 is_static = getter.IsStatic;
3290 }
3291
3292 if (setter != null) {
3293 IMethodData md = TypeManager.GetMethod (setter);
3294 if (md != null)
3295 md.SetMemberIsUsed ();
3296
3297 AccessorTable [setter] = PropertyInfo;
3298 is_static = setter.IsStatic;
3299 }
3300 }
3301
3302 bool InstanceResolve (EmitContext ec, bool lvalue_instance, bool must_do_cs1540_check)
3303 {
3304 if (is_static) {
3305 InstanceExpression = null;
3306 return true;
3307 }
3308
3309 if (InstanceExpression == null) {
3310 SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
3311 return false;
3312 }
3313
3314 if (lvalue_instance)
3315 InstanceExpression = InstanceExpression.ResolveLValue (ec, EmptyExpression.LValueMemberAccess, loc);
3316 else
3317 InstanceExpression = InstanceExpression.DoResolve (ec);
3318 if (InstanceExpression == null)
3319 return false;
3320
3321 InstanceExpression.CheckMarshalByRefAccess ();
3322
3323 if (must_do_cs1540_check && InstanceExpression != EmptyExpression.Null &&
3324 InstanceExpression.Type != ec.ContainerType &&
3325 ec.ContainerType.IsSubclassOf (PropertyInfo.DeclaringType) &&
3326 !InstanceExpression.Type.IsSubclassOf (ec.ContainerType)) {
3327 Error_CannotAccessProtected (loc, PropertyInfo, InstanceExpression.Type, ec.ContainerType);
3328 return false;
3329 }
3330
3331 return true;
3332 }
3333
3334 void Error_PropertyNotFound (MethodInfo mi, bool getter)
3335 {
3336 // TODO: correctly we should compare arguments but it will lead to bigger changes
3337 if (mi is MethodBuilder) {
3338 Error_TypeDoesNotContainDefinition (loc, PropertyInfo.DeclaringType, Name);
3339 return;
3340 }
3341
3342 StringBuilder sig = new StringBuilder (TypeManager.CSharpName (mi.DeclaringType));
3343 sig.Append ('.');
3344 ParameterData iparams = TypeManager.GetParameterData (mi);
3345 sig.Append (getter ? "get_" : "set_");
3346 sig.Append (Name);
3347 sig.Append (iparams.GetSignatureForError ());
3348
3349 Report.SymbolRelatedToPreviousError (mi);
3350 Report.Error (1546, loc, "Property `{0}' is not supported by the C# language. Try to call the accessor method `{1}' directly",
3351 Name, sig.ToString ());
3352 }
3353
3354 override public Expression DoResolve (EmitContext ec)
3355 {
3356 if (resolved)
3357 return this;
3358
3359 if (getter != null){
3360 if (TypeManager.GetParameterData (getter).Count != 0){
3361 Error_PropertyNotFound (getter, true);
3362 return null;
3363 }
3364 }
3365
3366 if (getter == null){
3367 //
3368 // The following condition happens if the PropertyExpr was
3369 // created, but is invalid (ie, the property is inaccessible),
3370 // and we did not want to embed the knowledge about this in
3371 // the caller routine. This only avoids double error reporting.
3372 //
3373 if (setter == null)
3374 return null;
3375
3376 if (InstanceExpression != EmptyExpression.Null) {
3377 Report.Error (154, loc, "The property or indexer `{0}' cannot be used in this context because it lacks the `get' accessor",
3378 TypeManager.GetFullNameSignature (PropertyInfo));
3379 return null;
3380 }
3381 }
3382
3383 bool must_do_cs1540_check = false;
3384 if (getter != null &&
3385 !IsAccessorAccessible (ec.ContainerType, getter, out must_do_cs1540_check)) {
3386 PropertyBase.PropertyMethod pm = TypeManager.GetMethod (getter) as PropertyBase.PropertyMethod;
3387 if (pm != null && pm.HasCustomAccessModifier) {
3388 Report.SymbolRelatedToPreviousError (pm);
3389 Report.Error (271, loc, "The property or indexer `{0}' cannot be used in this context because the get accessor is inaccessible",
3390 TypeManager.CSharpSignature (getter));
3391 }
3392 else {
3393 Report.SymbolRelatedToPreviousError (getter);
3394 ErrorIsInaccesible (loc, TypeManager.CSharpSignature (getter));
3395 }
3396 return null;
3397 }
3398
3399 if (!InstanceResolve (ec, false, must_do_cs1540_check))
3400 return null;
3401
3402 //
3403 // Only base will allow this invocation to happen.
3404 //
3405 if (IsBase && getter.IsAbstract) {
3406 Error_CannotCallAbstractBase (TypeManager.GetFullNameSignature (PropertyInfo));
3407 return null;
3408 }
3409
3410 if (PropertyInfo.PropertyType.IsPointer && !ec.InUnsafe){
3411 UnsafeError (loc);
3412 return null;
3413 }
3414
3415 resolved = true;
3416
3417 return this;
3418 }
3419
3420 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
3421 {
3422 if (right_side == EmptyExpression.OutAccess) {
3423 Report.Error (206, loc, "A property or indexer `{0}' may not be passed as an out or ref parameter",
3424 GetSignatureForError ());
3425 return null;
3426 }
3427
3428 if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess) {
3429 Report.Error (1612, loc, "Cannot modify the return value of `{0}' because it is not a variable",
3430 GetSignatureForError ());
3431 return null;
3432 }
3433
3434 if (setter == null){
3435 //
3436 // The following condition happens if the PropertyExpr was
3437 // created, but is invalid (ie, the property is inaccessible),
3438 // and we did not want to embed the knowledge about this in
3439 // the caller routine. This only avoids double error reporting.
3440 //
3441 if (getter == null)
3442 return null;
3443 Report.Error (200, loc, "Property or indexer `{0}' cannot be assigned to (it is read only)",
3444 GetSignatureForError ());
3445 return null;
3446 }
3447
3448 if (TypeManager.GetParameterData (setter).Count != 1){
3449 Error_PropertyNotFound (setter, false);
3450 return null;
3451 }
3452
3453 bool must_do_cs1540_check;
3454 if (!IsAccessorAccessible (ec.ContainerType, setter, out must_do_cs1540_check)) {
3455 PropertyBase.PropertyMethod pm = TypeManager.GetMethod (setter) as PropertyBase.PropertyMethod;
3456 if (pm != null && pm.HasCustomAccessModifier) {
3457 Report.SymbolRelatedToPreviousError (pm);
3458 Report.Error (272, loc, "The property or indexer `{0}' cannot be used in this context because the set accessor is inaccessible",
3459 TypeManager.CSharpSignature (setter));
3460 }
3461 else {
3462 Report.SymbolRelatedToPreviousError (setter);
3463 ErrorIsInaccesible (loc, TypeManager.CSharpSignature (setter));
3464 }
3465 return null;
3466 }
3467
3468 if (!InstanceResolve (ec, PropertyInfo.DeclaringType.IsValueType, must_do_cs1540_check))
3469 return null;
3470
3471 //
3472 // Only base will allow this invocation to happen.
3473 //
3474 if (IsBase && setter.IsAbstract){
3475 Error_CannotCallAbstractBase (TypeManager.GetFullNameSignature (PropertyInfo));
3476 return null;
3477 }
3478
3479 return this;
3480 }
3481
3482 public override void Emit (EmitContext ec)
3483 {
3484 Emit (ec, false);
3485 }
3486
3487 public void Emit (EmitContext ec, bool leave_copy)
3488 {
3489 //
3490 // Special case: length of single dimension array property is turned into ldlen
3491 //
3492 if ((getter == TypeManager.system_int_array_get_length) ||
3493 (getter == TypeManager.int_array_get_length)){
3494 Type iet = InstanceExpression.Type;
3495
3496 //
3497 // System.Array.Length can be called, but the Type does not
3498 // support invoking GetArrayRank, so test for that case first
3499 //
3500 if (iet != TypeManager.array_type && (iet.GetArrayRank () == 1)) {
3501 if (!prepared)
3502 EmitInstance (ec, false);
3503 ec.ig.Emit (OpCodes.Ldlen);
3504 ec.ig.Emit (OpCodes.Conv_I4);
3505 return;
3506 }
3507 }
3508
3509 Invocation.EmitCall (ec, IsBase, IsStatic, InstanceExpression, getter, null, loc, prepared, false);
3510
3511 if (leave_copy) {
3512 ec.ig.Emit (OpCodes.Dup);
3513 if (!is_static) {
3514 temp = new LocalTemporary (this.Type);
3515 temp.Store (ec);
3516 }
3517 }
3518 }
3519
3520 //
3521 // Implements the IAssignMethod interface for assignments
3522 //
3523 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
3524 {
3525 Expression my_source = source;
3526
3527 prepared = prepare_for_load;
3528
3529 if (prepared) {
3530 source.Emit (ec);
3531 if (leave_copy) {
3532 ec.ig.Emit (OpCodes.Dup);
3533 if (!is_static) {
3534 temp = new LocalTemporary (this.Type);
3535 temp.Store (ec);
3536 }
3537 }
3538 } else if (leave_copy) {
3539 source.Emit (ec);
3540 if (!is_static) {
3541 temp = new LocalTemporary (this.Type);
3542 temp.Store (ec);
3543 }
3544 my_source = temp;
3545 }
3546
3547 ArrayList args = new ArrayList (1);
3548 args.Add (new Argument (my_source, Argument.AType.Expression));
3549
3550 Invocation.EmitCall (ec, IsBase, IsStatic, InstanceExpression, setter, args, loc, false, prepared);
3551
3552 if (temp != null) {
3553 temp.Emit (ec);
3554 temp.Release (ec);
3555 }
3556 }
3557 }
3558
3559 /// <summary>
3560 /// Fully resolved expression that evaluates to an Event
3561 /// </summary>
3562 public class EventExpr : MemberExpr {
3563 public readonly EventInfo EventInfo;
3564
3565 bool is_static;
3566 MethodInfo add_accessor, remove_accessor;
3567
3568 internal static PtrHashtable AccessorTable = new PtrHashtable ();
3569
3570 public EventExpr (EventInfo ei, Location loc)
3571 {
3572 EventInfo = ei;
3573 this.loc = loc;
3574 eclass = ExprClass.EventAccess;
3575
3576 add_accessor = TypeManager.GetAddMethod (ei);
3577 remove_accessor = TypeManager.GetRemoveMethod (ei);
3578 if (add_accessor != null)
3579 AccessorTable [add_accessor] = ei;
3580 if (remove_accessor != null)
3581 AccessorTable [remove_accessor] = ei;
3582
3583 if (add_accessor.IsStatic || remove_accessor.IsStatic)
3584 is_static = true;
3585
3586 if (EventInfo is MyEventBuilder){
3587 MyEventBuilder eb = (MyEventBuilder) EventInfo;
3588 type = eb.EventType;
3589 eb.SetUsed ();
3590 } else
3591 type = EventInfo.EventHandlerType;
3592 }
3593
3594 public override string Name {
3595 get {
3596 return EventInfo.Name;
3597 }
3598 }
3599
3600 public override bool IsInstance {
3601 get {
3602 return !is_static;
3603 }
3604 }
3605
3606 public override bool IsStatic {
3607 get {
3608 return is_static;
3609 }
3610 }
3611
3612 public override Type DeclaringType {
3613 get {
3614 return EventInfo.DeclaringType;
3615 }
3616 }
3617
3618 public override Expression ResolveMemberAccess (EmitContext ec, Expression left, Location loc,
3619 SimpleName original)
3620 {
3621 //
3622 // If the event is local to this class, we transform ourselves into a FieldExpr
3623 //
3624
3625 if (EventInfo.DeclaringType == ec.ContainerType ||
3626 TypeManager.IsNestedChildOf(ec.ContainerType, EventInfo.DeclaringType)) {
3627 MemberInfo mi = TypeManager.GetPrivateFieldOfEvent (EventInfo);
3628
3629 if (mi != null) {
3630 MemberExpr ml = (MemberExpr) ExprClassFromMemberInfo (ec.ContainerType, mi, loc);
3631
3632 if (ml == null) {
3633 Report.Error (-200, loc, "Internal error!!");
3634 return null;
3635 }
3636
3637 InstanceExpression = null;
3638
3639 return ml.ResolveMemberAccess (ec, left, loc, original);
3640 }
3641 }
3642
3643 return base.ResolveMemberAccess (ec, left, loc, original);
3644 }
3645
3646
3647 bool InstanceResolve (EmitContext ec, bool must_do_cs1540_check)
3648 {
3649 if (is_static) {
3650 InstanceExpression = null;
3651 return true;
3652 }
3653
3654 if (InstanceExpression == null) {
3655 SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
3656 return false;
3657 }
3658
3659 InstanceExpression = InstanceExpression.DoResolve (ec);
3660 if (InstanceExpression == null)
3661 return false;
3662
3663 //
3664 // This is using the same mechanism as the CS1540 check in PropertyExpr.
3665 // However, in the Event case, we reported a CS0122 instead.
3666 //
3667 if (must_do_cs1540_check && InstanceExpression != EmptyExpression.Null &&
3668 InstanceExpression.Type != ec.ContainerType &&
3669 ec.ContainerType.IsSubclassOf (InstanceExpression.Type)) {
3670 Report.SymbolRelatedToPreviousError (EventInfo);
3671 ErrorIsInaccesible (loc, TypeManager.CSharpSignature (EventInfo));
3672 return false;
3673 }
3674
3675 return true;
3676 }
3677
3678 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
3679 {
3680 return DoResolve (ec);
3681 }
3682
3683 public override Expression DoResolve (EmitContext ec)
3684 {
3685 bool must_do_cs1540_check;
3686 if (!(IsAccessorAccessible (ec.ContainerType, add_accessor, out must_do_cs1540_check) &&
3687 IsAccessorAccessible (ec.ContainerType, remove_accessor, out must_do_cs1540_check))) {
3688 Report.SymbolRelatedToPreviousError (EventInfo);
3689 ErrorIsInaccesible (loc, TypeManager.CSharpSignature (EventInfo));
3690 return null;
3691 }
3692
3693 if (!InstanceResolve (ec, must_do_cs1540_check))
3694 return null;
3695
3696 return this;
3697 }
3698
3699 public override void Emit (EmitContext ec)
3700 {
3701 if (InstanceExpression is This)
3702 Report.Error (79, loc, "The event `{0}' can only appear on the left hand side of += or -=", GetSignatureForError ());
3703 else
3704 Report.Error (70, loc, "The event `{0}' can only appear on the left hand side of += or -= "+
3705 "(except on the defining type)", Name);
3706 }
3707
3708 public override string GetSignatureForError ()
3709 {
3710 return TypeManager.CSharpSignature (EventInfo);
3711 }
3712
3713 public void EmitAddOrRemove (EmitContext ec, Expression source)
3714 {
3715 BinaryDelegate source_del = (BinaryDelegate) source;
3716 Expression handler = source_del.Right;
3717
3718 Argument arg = new Argument (handler, Argument.AType.Expression);
3719 ArrayList args = new ArrayList ();
3720
3721 args.Add (arg);
3722
3723 if (source_del.IsAddition)
3724 Invocation.EmitCall (
3725 ec, false, IsStatic, InstanceExpression, add_accessor, args, loc);
3726 else
3727 Invocation.EmitCall (
3728 ec, false, IsStatic, InstanceExpression, remove_accessor, args, loc);
3729 }
3730 }
3731
3732
3733 public class TemporaryVariable : Expression, IMemoryLocation
3734 {
3735 LocalInfo li;
3736
3737 public TemporaryVariable (Type type, Location loc)
3738 {
3739 this.type = type;
3740 this.loc = loc;
3741 eclass = ExprClass.Value;
3742 }
3743
3744 public override Expression DoResolve (EmitContext ec)
3745 {
3746 if (li != null)
3747 return this;
3748
3749 TypeExpr te = new TypeExpression (type, loc);
3750 li = ec.CurrentBlock.AddTemporaryVariable (te, loc);
3751 if (!li.Resolve (ec))
3752 return null;
3753
3754 AnonymousContainer am = ec.CurrentAnonymousMethod;
3755 if ((am != null) && am.IsIterator)
3756 ec.CaptureVariable (li);
3757
3758 return this;
3759 }
3760
3761 public override void Emit (EmitContext ec)
3762 {
3763 ILGenerator ig = ec.ig;
3764
3765 if (li.FieldBuilder != null) {
3766 ig.Emit (OpCodes.Ldarg_0);
3767 ig.Emit (OpCodes.Ldfld, li.FieldBuilder);
3768 } else {
3769 ig.Emit (OpCodes.Ldloc, li.LocalBuilder);
3770 }
3771 }
3772
3773 public void EmitLoadAddress (EmitContext ec)
3774 {
3775 ILGenerator ig = ec.ig;
3776
3777 if (li.FieldBuilder != null) {
3778 ig.Emit (OpCodes.Ldarg_0);
3779 ig.Emit (OpCodes.Ldflda, li.FieldBuilder);
3780 } else {
3781 ig.Emit (OpCodes.Ldloca, li.LocalBuilder);
3782 }
3783 }
3784
3785 public void Store (EmitContext ec, Expression right_side)
3786 {
3787 if (li.FieldBuilder != null)
3788 ec.ig.Emit (OpCodes.Ldarg_0);
3789
3790 right_side.Emit (ec);
3791 if (li.FieldBuilder != null) {
3792 ec.ig.Emit (OpCodes.Stfld, li.FieldBuilder);
3793 } else {
3794 ec.ig.Emit (OpCodes.Stloc, li.LocalBuilder);
3795 }
3796 }
3797
3798 public void EmitThis (EmitContext ec)
3799 {
3800 if (li.FieldBuilder != null) {
3801 ec.ig.Emit (OpCodes.Ldarg_0);
3802 }
3803 }
3804
3805 public void EmitStore (ILGenerator ig)
3806 {
3807 if (li.FieldBuilder != null)
3808 ig.Emit (OpCodes.Stfld, li.FieldBuilder);
3809 else
3810 ig.Emit (OpCodes.Stloc, li.LocalBuilder);
3811 }
3812
3813 public void AddressOf (EmitContext ec, AddressOp mode)
3814 {
3815 EmitLoadAddress (ec);
3816 }
3817 }
3818
3819 }
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