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disable broken tests on net_4_0
[mcs.git] / mcs / expression.cs
blob3b0b8af8da9f21d2cbbf2def85c528a2c54f295b
1 //
2 // expression.cs: Expression representation for the IL tree.
3 //
4 // Author:
5 // Miguel de Icaza (miguel@ximian.com)
6 // Marek Safar (marek.safar@gmail.com)
7 //
8 // Copyright 2001, 2002, 2003 Ximian, Inc.
9 // Copyright 2003-2008 Novell, Inc.
10 //
11 #define USE_OLD
12
13 namespace Mono.CSharp {
14 using System;
15 using System.Collections.Generic;
16 using System.Reflection;
17 using System.Reflection.Emit;
18 using System.Text;
19 using System.Linq;
20 using SLE = System.Linq.Expressions;
21
22 //
23 // This is an user operator expression, automatically created during
24 // resolve phase
25 //
26 public class UserOperatorCall : Expression {
27 public delegate Expression ExpressionTreeExpression (ResolveContext ec, MethodGroupExpr mg);
28
29 protected readonly Arguments arguments;
30 protected readonly MethodGroupExpr mg;
31 readonly ExpressionTreeExpression expr_tree;
32
33 public UserOperatorCall (MethodGroupExpr mg, Arguments args, ExpressionTreeExpression expr_tree, Location loc)
34 {
35 this.mg = mg;
36 this.arguments = args;
37 this.expr_tree = expr_tree;
38
39 type = mg.BestCandidate.ReturnType;
40 eclass = ExprClass.Value;
41 this.loc = loc;
42 }
43
44 public override Expression CreateExpressionTree (ResolveContext ec)
45 {
46 if (expr_tree != null)
47 return expr_tree (ec, mg);
48
49 Arguments args = Arguments.CreateForExpressionTree (ec, arguments,
50 new NullLiteral (loc),
51 mg.CreateExpressionTree (ec));
52
53 return CreateExpressionFactoryCall (ec, "Call", args);
54 }
55
56 protected override void CloneTo (CloneContext context, Expression target)
57 {
58 // Nothing to clone
59 }
60
61 protected override Expression DoResolve (ResolveContext ec)
62 {
63 //
64 // We are born fully resolved
65 //
66 return this;
67 }
68
69 public override void Emit (EmitContext ec)
70 {
71 mg.EmitCall (ec, arguments);
72 }
73
74 public override SLE.Expression MakeExpression (BuilderContext ctx)
75 {
76 var method = mg.BestCandidate.GetMetaInfo () as MethodInfo;
77 return SLE.Expression.Call (method, Arguments.MakeExpression (arguments, ctx));
78 }
79
80 public MethodGroupExpr Method {
81 get { return mg; }
82 }
83 }
84
85 public class ParenthesizedExpression : ShimExpression
86 {
87 public ParenthesizedExpression (Expression expr)
88 : base (expr)
89 {
90 loc = expr.Location;
91 }
92
93 protected override Expression DoResolve (ResolveContext ec)
94 {
95 return expr.Resolve (ec);
96 }
97
98 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
99 {
100 return expr.DoResolveLValue (ec, right_side);
101 }
102 }
103
104 //
105 // Unary implements unary expressions.
106 //
107 public class Unary : Expression
108 {
109 public enum Operator : byte {
110 UnaryPlus, UnaryNegation, LogicalNot, OnesComplement,
111 AddressOf, TOP
112 }
113
114 static TypeSpec[][] predefined_operators;
115
116 public readonly Operator Oper;
117 public Expression Expr;
118 Expression enum_conversion;
119
120 public Unary (Operator op, Expression expr, Location loc)
121 {
122 Oper = op;
123 Expr = expr;
124 this.loc = loc;
125 }
126
127 // <summary>
128 // This routine will attempt to simplify the unary expression when the
129 // argument is a constant.
130 // </summary>
131 Constant TryReduceConstant (ResolveContext ec, Constant e)
132 {
133 if (e is EmptyConstantCast)
134 return TryReduceConstant (ec, ((EmptyConstantCast) e).child);
135
136 if (e is SideEffectConstant) {
137 Constant r = TryReduceConstant (ec, ((SideEffectConstant) e).value);
138 return r == null ? null : new SideEffectConstant (r, e, r.Location);
139 }
140
141 TypeSpec expr_type = e.Type;
142
143 switch (Oper){
144 case Operator.UnaryPlus:
145 // Unary numeric promotions
146 if (expr_type == TypeManager.byte_type)
147 return new IntConstant (((ByteConstant)e).Value, e.Location);
148 if (expr_type == TypeManager.sbyte_type)
149 return new IntConstant (((SByteConstant)e).Value, e.Location);
150 if (expr_type == TypeManager.short_type)
151 return new IntConstant (((ShortConstant)e).Value, e.Location);
152 if (expr_type == TypeManager.ushort_type)
153 return new IntConstant (((UShortConstant)e).Value, e.Location);
154 if (expr_type == TypeManager.char_type)
155 return new IntConstant (((CharConstant)e).Value, e.Location);
156
157 // Predefined operators
158 if (expr_type == TypeManager.int32_type || expr_type == TypeManager.uint32_type ||
159 expr_type == TypeManager.int64_type || expr_type == TypeManager.uint64_type ||
160 expr_type == TypeManager.float_type || expr_type == TypeManager.double_type ||
161 expr_type == TypeManager.decimal_type) {
162 return e;
163 }
164
165 return null;
166
167 case Operator.UnaryNegation:
168 // Unary numeric promotions
169 if (expr_type == TypeManager.byte_type)
170 return new IntConstant (-((ByteConstant)e).Value, e.Location);
171 if (expr_type == TypeManager.sbyte_type)
172 return new IntConstant (-((SByteConstant)e).Value, e.Location);
173 if (expr_type == TypeManager.short_type)
174 return new IntConstant (-((ShortConstant)e).Value, e.Location);
175 if (expr_type == TypeManager.ushort_type)
176 return new IntConstant (-((UShortConstant)e).Value, e.Location);
177 if (expr_type == TypeManager.char_type)
178 return new IntConstant (-((CharConstant)e).Value, e.Location);
179
180 // Predefined operators
181 if (expr_type == TypeManager.int32_type) {
182 int value = ((IntConstant)e).Value;
183 if (value == int.MinValue) {
184 if (ec.ConstantCheckState) {
185 ConstantFold.Error_CompileTimeOverflow (ec, loc);
186 return null;
187 }
188 return e;
189 }
190 return new IntConstant (-value, e.Location);
191 }
192 if (expr_type == TypeManager.int64_type) {
193 long value = ((LongConstant)e).Value;
194 if (value == long.MinValue) {
195 if (ec.ConstantCheckState) {
196 ConstantFold.Error_CompileTimeOverflow (ec, loc);
197 return null;
198 }
199 return e;
200 }
201 return new LongConstant (-value, e.Location);
202 }
203
204 if (expr_type == TypeManager.uint32_type) {
205 UIntLiteral uil = e as UIntLiteral;
206 if (uil != null) {
207 if (uil.Value == int.MaxValue + (uint) 1)
208 return new IntLiteral (int.MinValue, e.Location);
209 return new LongLiteral (-uil.Value, e.Location);
210 }
211 return new LongConstant (-((UIntConstant)e).Value, e.Location);
212 }
213
214 if (expr_type == TypeManager.uint64_type) {
215 ULongLiteral ull = e as ULongLiteral;
216 if (ull != null && ull.Value == 9223372036854775808)
217 return new LongLiteral (long.MinValue, e.Location);
218 return null;
219 }
220
221 if (expr_type == TypeManager.float_type) {
222 FloatLiteral fl = e as FloatLiteral;
223 // For better error reporting
224 if (fl != null)
225 return new FloatLiteral (-fl.Value, e.Location);
226
227 return new FloatConstant (-((FloatConstant)e).Value, e.Location);
228 }
229 if (expr_type == TypeManager.double_type) {
230 DoubleLiteral dl = e as DoubleLiteral;
231 // For better error reporting
232 if (dl != null)
233 return new DoubleLiteral (-dl.Value, e.Location);
234
235 return new DoubleConstant (-((DoubleConstant)e).Value, e.Location);
236 }
237 if (expr_type == TypeManager.decimal_type)
238 return new DecimalConstant (-((DecimalConstant)e).Value, e.Location);
239
240 return null;
241
242 case Operator.LogicalNot:
243 if (expr_type != TypeManager.bool_type)
244 return null;
245
246 bool b = (bool)e.GetValue ();
247 return new BoolConstant (!b, e.Location);
248
249 case Operator.OnesComplement:
250 // Unary numeric promotions
251 if (expr_type == TypeManager.byte_type)
252 return new IntConstant (~((ByteConstant)e).Value, e.Location);
253 if (expr_type == TypeManager.sbyte_type)
254 return new IntConstant (~((SByteConstant)e).Value, e.Location);
255 if (expr_type == TypeManager.short_type)
256 return new IntConstant (~((ShortConstant)e).Value, e.Location);
257 if (expr_type == TypeManager.ushort_type)
258 return new IntConstant (~((UShortConstant)e).Value, e.Location);
259 if (expr_type == TypeManager.char_type)
260 return new IntConstant (~((CharConstant)e).Value, e.Location);
261
262 // Predefined operators
263 if (expr_type == TypeManager.int32_type)
264 return new IntConstant (~((IntConstant)e).Value, e.Location);
265 if (expr_type == TypeManager.uint32_type)
266 return new UIntConstant (~((UIntConstant)e).Value, e.Location);
267 if (expr_type == TypeManager.int64_type)
268 return new LongConstant (~((LongConstant)e).Value, e.Location);
269 if (expr_type == TypeManager.uint64_type){
270 return new ULongConstant (~((ULongConstant)e).Value, e.Location);
271 }
272 if (e is EnumConstant) {
273 e = TryReduceConstant (ec, ((EnumConstant)e).Child);
274 if (e != null)
275 e = new EnumConstant (e, expr_type);
276 return e;
277 }
278 return null;
279 }
280 throw new Exception ("Can not constant fold: " + Oper.ToString());
281 }
282
283 protected Expression ResolveOperator (ResolveContext ec, Expression expr)
284 {
285 eclass = ExprClass.Value;
286
287 if (predefined_operators == null)
288 CreatePredefinedOperatorsTable ();
289
290 TypeSpec expr_type = expr.Type;
291 Expression best_expr;
292
293 //
294 // Primitive types first
295 //
296 if (TypeManager.IsPrimitiveType (expr_type)) {
297 best_expr = ResolvePrimitivePredefinedType (expr);
298 if (best_expr == null)
299 return null;
300
301 type = best_expr.Type;
302 Expr = best_expr;
303 return this;
304 }
305
306 //
307 // E operator ~(E x);
308 //
309 if (Oper == Operator.OnesComplement && TypeManager.IsEnumType (expr_type))
310 return ResolveEnumOperator (ec, expr);
311
312 return ResolveUserType (ec, expr);
313 }
314
315 protected virtual Expression ResolveEnumOperator (ResolveContext ec, Expression expr)
316 {
317 TypeSpec underlying_type = EnumSpec.GetUnderlyingType (expr.Type);
318 Expression best_expr = ResolvePrimitivePredefinedType (EmptyCast.Create (expr, underlying_type));
319 if (best_expr == null)
320 return null;
321
322 Expr = best_expr;
323 enum_conversion = Convert.ExplicitNumericConversion (new EmptyExpression (best_expr.Type), underlying_type);
324 type = expr.Type;
325 return EmptyCast.Create (this, type);
326 }
327
328 public override Expression CreateExpressionTree (ResolveContext ec)
329 {
330 return CreateExpressionTree (ec, null);
331 }
332
333 Expression CreateExpressionTree (ResolveContext ec, MethodGroupExpr user_op)
334 {
335 string method_name;
336 switch (Oper) {
337 case Operator.AddressOf:
338 Error_PointerInsideExpressionTree (ec);
339 return null;
340 case Operator.UnaryNegation:
341 if (ec.HasSet (ResolveContext.Options.CheckedScope) && user_op == null && !IsFloat (type))
342 method_name = "NegateChecked";
343 else
344 method_name = "Negate";
345 break;
346 case Operator.OnesComplement:
347 case Operator.LogicalNot:
348 method_name = "Not";
349 break;
350 case Operator.UnaryPlus:
351 method_name = "UnaryPlus";
352 break;
353 default:
354 throw new InternalErrorException ("Unknown unary operator " + Oper.ToString ());
355 }
356
357 Arguments args = new Arguments (2);
358 args.Add (new Argument (Expr.CreateExpressionTree (ec)));
359 if (user_op != null)
360 args.Add (new Argument (user_op.CreateExpressionTree (ec)));
361 return CreateExpressionFactoryCall (ec, method_name, args);
362 }
363
364 static void CreatePredefinedOperatorsTable ()
365 {
366 predefined_operators = new TypeSpec [(int) Operator.TOP] [];
367
368 //
369 // 7.6.1 Unary plus operator
370 //
371 predefined_operators [(int) Operator.UnaryPlus] = new TypeSpec [] {
372 TypeManager.int32_type, TypeManager.uint32_type,
373 TypeManager.int64_type, TypeManager.uint64_type,
374 TypeManager.float_type, TypeManager.double_type,
375 TypeManager.decimal_type
376 };
377
378 //
379 // 7.6.2 Unary minus operator
380 //
381 predefined_operators [(int) Operator.UnaryNegation] = new TypeSpec [] {
382 TypeManager.int32_type,
383 TypeManager.int64_type,
384 TypeManager.float_type, TypeManager.double_type,
385 TypeManager.decimal_type
386 };
387
388 //
389 // 7.6.3 Logical negation operator
390 //
391 predefined_operators [(int) Operator.LogicalNot] = new TypeSpec [] {
392 TypeManager.bool_type
393 };
394
395 //
396 // 7.6.4 Bitwise complement operator
397 //
398 predefined_operators [(int) Operator.OnesComplement] = new TypeSpec [] {
399 TypeManager.int32_type, TypeManager.uint32_type,
400 TypeManager.int64_type, TypeManager.uint64_type
401 };
402 }
403
404 //
405 // Unary numeric promotions
406 //
407 static Expression DoNumericPromotion (Operator op, Expression expr)
408 {
409 TypeSpec expr_type = expr.Type;
410 if ((op == Operator.UnaryPlus || op == Operator.UnaryNegation || op == Operator.OnesComplement) &&
411 expr_type == TypeManager.byte_type || expr_type == TypeManager.sbyte_type ||
412 expr_type == TypeManager.short_type || expr_type == TypeManager.ushort_type ||
413 expr_type == TypeManager.char_type)
414 return Convert.ImplicitNumericConversion (expr, TypeManager.int32_type);
415
416 if (op == Operator.UnaryNegation && expr_type == TypeManager.uint32_type)
417 return Convert.ImplicitNumericConversion (expr, TypeManager.int64_type);
418
419 return expr;
420 }
421
422 protected override Expression DoResolve (ResolveContext ec)
423 {
424 if (Oper == Operator.AddressOf) {
425 return ResolveAddressOf (ec);
426 }
427
428 Expr = Expr.Resolve (ec);
429 if (Expr == null)
430 return null;
431
432 if (Expr.Type == InternalType.Dynamic) {
433 Arguments args = new Arguments (1);
434 args.Add (new Argument (Expr));
435 return new DynamicUnaryConversion (GetOperatorExpressionTypeName (), args, loc).Resolve (ec);
436 }
437
438 if (TypeManager.IsNullableType (Expr.Type))
439 return new Nullable.LiftedUnaryOperator (Oper, Expr, loc).Resolve (ec);
440
441 //
442 // Attempt to use a constant folding operation.
443 //
444 Constant cexpr = Expr as Constant;
445 if (cexpr != null) {
446 cexpr = TryReduceConstant (ec, cexpr);
447 if (cexpr != null)
448 return cexpr.Resolve (ec);
449 }
450
451 Expression expr = ResolveOperator (ec, Expr);
452 if (expr == null)
453 Error_OperatorCannotBeApplied (ec, loc, OperName (Oper), Expr.Type);
454
455 //
456 // Reduce unary operator on predefined types
457 //
458 if (expr == this && Oper == Operator.UnaryPlus)
459 return Expr;
460
461 return expr;
462 }
463
464 public override Expression DoResolveLValue (ResolveContext ec, Expression right)
465 {
466 return null;
467 }
468
469 public override void Emit (EmitContext ec)
470 {
471 EmitOperator (ec, type);
472 }
473
474 protected void EmitOperator (EmitContext ec, TypeSpec type)
475 {
476 switch (Oper) {
477 case Operator.UnaryPlus:
478 Expr.Emit (ec);
479 break;
480
481 case Operator.UnaryNegation:
482 if (ec.HasSet (EmitContext.Options.CheckedScope) && !IsFloat (type)) {
483 ec.Emit (OpCodes.Ldc_I4_0);
484 if (type == TypeManager.int64_type)
485 ec.Emit (OpCodes.Conv_U8);
486 Expr.Emit (ec);
487 ec.Emit (OpCodes.Sub_Ovf);
488 } else {
489 Expr.Emit (ec);
490 ec.Emit (OpCodes.Neg);
491 }
492
493 break;
494
495 case Operator.LogicalNot:
496 Expr.Emit (ec);
497 ec.Emit (OpCodes.Ldc_I4_0);
498 ec.Emit (OpCodes.Ceq);
499 break;
500
501 case Operator.OnesComplement:
502 Expr.Emit (ec);
503 ec.Emit (OpCodes.Not);
504 break;
505
506 case Operator.AddressOf:
507 ((IMemoryLocation)Expr).AddressOf (ec, AddressOp.LoadStore);
508 break;
509
510 default:
511 throw new Exception ("This should not happen: Operator = "
512 + Oper.ToString ());
513 }
514
515 //
516 // Same trick as in Binary expression
517 //
518 if (enum_conversion != null)
519 enum_conversion.Emit (ec);
520 }
521
522 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
523 {
524 if (Oper == Operator.LogicalNot)
525 Expr.EmitBranchable (ec, target, !on_true);
526 else
527 base.EmitBranchable (ec, target, on_true);
528 }
529
530 public override void EmitSideEffect (EmitContext ec)
531 {
532 Expr.EmitSideEffect (ec);
533 }
534
535 public static void Error_OperatorCannotBeApplied (ResolveContext ec, Location loc, string oper, TypeSpec t)
536 {
537 ec.Report.Error (23, loc, "The `{0}' operator cannot be applied to operand of type `{1}'",
538 oper, TypeManager.CSharpName (t));
539 }
540
541 //
542 // Converts operator to System.Linq.Expressions.ExpressionType enum name
543 //
544 string GetOperatorExpressionTypeName ()
545 {
546 switch (Oper) {
547 case Operator.OnesComplement:
548 return "OnesComplement";
549 case Operator.LogicalNot:
550 return "Not";
551 case Operator.UnaryNegation:
552 return "Negate";
553 case Operator.UnaryPlus:
554 return "UnaryPlus";
555 default:
556 throw new NotImplementedException ("Unknown express type operator " + Oper.ToString ());
557 }
558 }
559
560 static bool IsFloat (TypeSpec t)
561 {
562 return t == TypeManager.float_type || t == TypeManager.double_type;
563 }
564
565 //
566 // Returns a stringified representation of the Operator
567 //
568 public static string OperName (Operator oper)
569 {
570 switch (oper) {
571 case Operator.UnaryPlus:
572 return "+";
573 case Operator.UnaryNegation:
574 return "-";
575 case Operator.LogicalNot:
576 return "!";
577 case Operator.OnesComplement:
578 return "~";
579 case Operator.AddressOf:
580 return "&";
581 }
582
583 throw new NotImplementedException (oper.ToString ());
584 }
585
586 public override SLE.Expression MakeExpression (BuilderContext ctx)
587 {
588 var expr = Expr.MakeExpression (ctx);
589 bool is_checked = ctx.HasSet (BuilderContext.Options.CheckedScope);
590
591 switch (Oper) {
592 case Operator.UnaryNegation:
593 return is_checked ? SLE.Expression.NegateChecked (expr) : SLE.Expression.Negate (expr);
594 case Operator.LogicalNot:
595 return SLE.Expression.Not (expr);
596 #if NET_4_0
597 case Operator.OnesComplement:
598 return SLE.Expression.OnesComplement (expr);
599 #endif
600 default:
601 throw new NotImplementedException (Oper.ToString ());
602 }
603 }
604
605 public static void Reset ()
606 {
607 predefined_operators = null;
608 }
609
610 Expression ResolveAddressOf (ResolveContext ec)
611 {
612 if (!ec.IsUnsafe)
613 UnsafeError (ec, loc);
614
615 Expr = Expr.DoResolveLValue (ec, EmptyExpression.UnaryAddress);
616 if (Expr == null || Expr.eclass != ExprClass.Variable) {
617 ec.Report.Error (211, loc, "Cannot take the address of the given expression");
618 return null;
619 }
620
621 if (!TypeManager.VerifyUnmanaged (ec.Compiler, Expr.Type, loc)) {
622 return null;
623 }
624
625 IVariableReference vr = Expr as IVariableReference;
626 bool is_fixed;
627 if (vr != null) {
628 VariableInfo vi = vr.VariableInfo;
629 if (vi != null) {
630 if (vi.LocalInfo != null)
631 vi.LocalInfo.Used = true;
632
633 //
634 // A variable is considered definitely assigned if you take its address.
635 //
636 vi.SetAssigned (ec);
637 }
638
639 is_fixed = vr.IsFixed;
640 vr.SetHasAddressTaken ();
641
642 if (vr.IsHoisted) {
643 AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, vr, loc);
644 }
645 } else {
646 IFixedExpression fe = Expr as IFixedExpression;
647 is_fixed = fe != null && fe.IsFixed;
648 }
649
650 if (!is_fixed && !ec.HasSet (ResolveContext.Options.FixedInitializerScope)) {
651 ec.Report.Error (212, loc, "You can only take the address of unfixed expression inside of a fixed statement initializer");
652 }
653
654 type = PointerContainer.MakeType (Expr.Type);
655 eclass = ExprClass.Value;
656 return this;
657 }
658
659 Expression ResolvePrimitivePredefinedType (Expression expr)
660 {
661 expr = DoNumericPromotion (Oper, expr);
662 TypeSpec expr_type = expr.Type;
663 TypeSpec[] predefined = predefined_operators [(int) Oper];
664 foreach (TypeSpec t in predefined) {
665 if (t == expr_type)
666 return expr;
667 }
668 return null;
669 }
670
671 //
672 // Perform user-operator overload resolution
673 //
674 protected virtual Expression ResolveUserOperator (ResolveContext ec, Expression expr)
675 {
676 CSharp.Operator.OpType op_type;
677 switch (Oper) {
678 case Operator.LogicalNot:
679 op_type = CSharp.Operator.OpType.LogicalNot; break;
680 case Operator.OnesComplement:
681 op_type = CSharp.Operator.OpType.OnesComplement; break;
682 case Operator.UnaryNegation:
683 op_type = CSharp.Operator.OpType.UnaryNegation; break;
684 case Operator.UnaryPlus:
685 op_type = CSharp.Operator.OpType.UnaryPlus; break;
686 default:
687 throw new InternalErrorException (Oper.ToString ());
688 }
689
690 string op_name = CSharp.Operator.GetMetadataName (op_type);
691 MethodGroupExpr user_op = MethodLookup (ec.Compiler, ec.CurrentType, expr.Type, MemberKind.Operator, op_name, 0, expr.Location);
692 if (user_op == null)
693 return null;
694
695 Arguments args = new Arguments (1);
696 args.Add (new Argument (expr));
697 user_op = user_op.OverloadResolve (ec, ref args, false, expr.Location);
698
699 if (user_op == null)
700 return null;
701
702 Expr = args [0].Expr;
703 return new UserOperatorCall (user_op, args, CreateExpressionTree, expr.Location);
704 }
705
706 //
707 // Unary user type overload resolution
708 //
709 Expression ResolveUserType (ResolveContext ec, Expression expr)
710 {
711 Expression best_expr = ResolveUserOperator (ec, expr);
712 if (best_expr != null)
713 return best_expr;
714
715 TypeSpec[] predefined = predefined_operators [(int) Oper];
716 foreach (TypeSpec t in predefined) {
717 Expression oper_expr = Convert.UserDefinedConversion (ec, expr, t, expr.Location, false, false);
718 if (oper_expr == null)
719 continue;
720
721 //
722 // decimal type is predefined but has user-operators
723 //
724 if (oper_expr.Type == TypeManager.decimal_type)
725 oper_expr = ResolveUserType (ec, oper_expr);
726 else
727 oper_expr = ResolvePrimitivePredefinedType (oper_expr);
728
729 if (oper_expr == null)
730 continue;
731
732 if (best_expr == null) {
733 best_expr = oper_expr;
734 continue;
735 }
736
737 int result = MethodGroupExpr.BetterTypeConversion (ec, best_expr.Type, t);
738 if (result == 0) {
739 ec.Report.Error (35, loc, "Operator `{0}' is ambiguous on an operand of type `{1}'",
740 OperName (Oper), TypeManager.CSharpName (expr.Type));
741 break;
742 }
743
744 if (result == 2)
745 best_expr = oper_expr;
746 }
747
748 if (best_expr == null)
749 return null;
750
751 //
752 // HACK: Decimal user-operator is included in standard operators
753 //
754 if (best_expr.Type == TypeManager.decimal_type)
755 return best_expr;
756
757 Expr = best_expr;
758 type = best_expr.Type;
759 return this;
760 }
761
762 protected override void CloneTo (CloneContext clonectx, Expression t)
763 {
764 Unary target = (Unary) t;
765
766 target.Expr = Expr.Clone (clonectx);
767 }
768 }
769
770 //
771 // Unary operators are turned into Indirection expressions
772 // after semantic analysis (this is so we can take the address
773 // of an indirection).
774 //
775 public class Indirection : Expression, IMemoryLocation, IAssignMethod, IFixedExpression {
776 Expression expr;
777 LocalTemporary temporary;
778 bool prepared;
779
780 public Indirection (Expression expr, Location l)
781 {
782 this.expr = expr;
783 loc = l;
784 }
785
786 public override Expression CreateExpressionTree (ResolveContext ec)
787 {
788 Error_PointerInsideExpressionTree (ec);
789 return null;
790 }
791
792 protected override void CloneTo (CloneContext clonectx, Expression t)
793 {
794 Indirection target = (Indirection) t;
795 target.expr = expr.Clone (clonectx);
796 }
797
798 public override void Emit (EmitContext ec)
799 {
800 if (!prepared)
801 expr.Emit (ec);
802
803 ec.EmitLoadFromPtr (Type);
804 }
805
806 public void Emit (EmitContext ec, bool leave_copy)
807 {
808 Emit (ec);
809 if (leave_copy) {
810 ec.Emit (OpCodes.Dup);
811 temporary = new LocalTemporary (expr.Type);
812 temporary.Store (ec);
813 }
814 }
815
816 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
817 {
818 prepared = prepare_for_load;
819
820 expr.Emit (ec);
821
822 if (prepare_for_load)
823 ec.Emit (OpCodes.Dup);
824
825 source.Emit (ec);
826 if (leave_copy) {
827 ec.Emit (OpCodes.Dup);
828 temporary = new LocalTemporary (expr.Type);
829 temporary.Store (ec);
830 }
831
832 ec.EmitStoreFromPtr (type);
833
834 if (temporary != null) {
835 temporary.Emit (ec);
836 temporary.Release (ec);
837 }
838 }
839
840 public void AddressOf (EmitContext ec, AddressOp Mode)
841 {
842 expr.Emit (ec);
843 }
844
845 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
846 {
847 return DoResolve (ec);
848 }
849
850 protected override Expression DoResolve (ResolveContext ec)
851 {
852 expr = expr.Resolve (ec);
853 if (expr == null)
854 return null;
855
856 if (!ec.IsUnsafe)
857 UnsafeError (ec, loc);
858
859 if (!expr.Type.IsPointer) {
860 ec.Report.Error (193, loc, "The * or -> operator must be applied to a pointer");
861 return null;
862 }
863
864 if (expr.Type == TypeManager.void_ptr_type) {
865 ec.Report.Error (242, loc, "The operation in question is undefined on void pointers");
866 return null;
867 }
868
869 type = TypeManager.GetElementType (expr.Type);
870 eclass = ExprClass.Variable;
871 return this;
872 }
873
874 public bool IsFixed {
875 get { return true; }
876 }
877
878 public override string ToString ()
879 {
880 return "*(" + expr + ")";
881 }
882 }
883
884 /// <summary>
885 /// Unary Mutator expressions (pre and post ++ and --)
886 /// </summary>
887 ///
888 /// <remarks>
889 /// UnaryMutator implements ++ and -- expressions. It derives from
890 /// ExpressionStatement becuase the pre/post increment/decrement
891 /// operators can be used in a statement context.
892 ///
893 /// FIXME: Idea, we could split this up in two classes, one simpler
894 /// for the common case, and one with the extra fields for more complex
895 /// classes (indexers require temporary access; overloaded require method)
896 ///
897 /// </remarks>
898 public class UnaryMutator : ExpressionStatement
899 {
900 class DynamicPostMutator : Expression, IAssignMethod
901 {
902 LocalTemporary temp;
903 Expression expr;
904
905 public DynamicPostMutator (Expression expr)
906 {
907 this.expr = expr;
908 this.type = expr.Type;
909 this.loc = expr.Location;
910 }
911
912 public override Expression CreateExpressionTree (ResolveContext ec)
913 {
914 throw new NotImplementedException ("ET");
915 }
916
917 protected override Expression DoResolve (ResolveContext rc)
918 {
919 eclass = expr.eclass;
920 return this;
921 }
922
923 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
924 {
925 expr.DoResolveLValue (ec, right_side);
926 return DoResolve (ec);
927 }
928
929 public override void Emit (EmitContext ec)
930 {
931 temp.Emit (ec);
932 }
933
934 public void Emit (EmitContext ec, bool leave_copy)
935 {
936 throw new NotImplementedException ();
937 }
938
939 //
940 // Emits target assignment using unmodified source value
941 //
942 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
943 {
944 //
945 // Allocate temporary variable to keep original value before it's modified
946 //
947 temp = new LocalTemporary (type);
948 expr.Emit (ec);
949 temp.Store (ec);
950
951 ((IAssignMethod) expr).EmitAssign (ec, source, false, prepare_for_load);
952
953 if (leave_copy)
954 Emit (ec);
955
956 temp.Release (ec);
957 temp = null;
958 }
959 }
960
961 [Flags]
962 public enum Mode : byte {
963 IsIncrement = 0,
964 IsDecrement = 1,
965 IsPre = 0,
966 IsPost = 2,
967
968 PreIncrement = 0,
969 PreDecrement = IsDecrement,
970 PostIncrement = IsPost,
971 PostDecrement = IsPost | IsDecrement
972 }
973
974 Mode mode;
975 bool is_expr, recurse;
976
977 Expression expr;
978
979 // Holds the real operation
980 Expression operation;
981
982 public UnaryMutator (Mode m, Expression e, Location loc)
983 {
984 mode = m;
985 this.loc = loc;
986 expr = e;
987 }
988
989 public override Expression CreateExpressionTree (ResolveContext ec)
990 {
991 return new SimpleAssign (this, this).CreateExpressionTree (ec);
992 }
993
994 protected override Expression DoResolve (ResolveContext ec)
995 {
996 expr = expr.Resolve (ec);
997
998 if (expr == null)
999 return null;
1000
1001 if (expr.Type == InternalType.Dynamic) {
1002 //
1003 // Handle postfix unary operators using local
1004 // temporary variable
1005 //
1006 if ((mode & Mode.IsPost) != 0)
1007 expr = new DynamicPostMutator (expr);
1008
1009 Arguments args = new Arguments (1);
1010 args.Add (new Argument (expr));
1011 return new SimpleAssign (expr, new DynamicUnaryConversion (GetOperatorExpressionTypeName (), args, loc)).Resolve (ec);
1012 }
1013
1014 if (TypeManager.IsNullableType (expr.Type))
1015 return new Nullable.LiftedUnaryMutator (mode, expr, loc).Resolve (ec);
1016
1017 eclass = ExprClass.Value;
1018 type = expr.Type;
1019 return ResolveOperator (ec);
1020 }
1021
1022 void EmitCode (EmitContext ec, bool is_expr)
1023 {
1024 recurse = true;
1025 this.is_expr = is_expr;
1026 ((IAssignMethod) expr).EmitAssign (ec, this, is_expr && (mode == Mode.PreIncrement || mode == Mode.PreDecrement), true);
1027 }
1028
1029 public override void Emit (EmitContext ec)
1030 {
1031 //
1032 // We use recurse to allow ourselfs to be the source
1033 // of an assignment. This little hack prevents us from
1034 // having to allocate another expression
1035 //
1036 if (recurse) {
1037 ((IAssignMethod) expr).Emit (ec, is_expr && (mode == Mode.PostIncrement || mode == Mode.PostDecrement));
1038
1039 operation.Emit (ec);
1040
1041 recurse = false;
1042 return;
1043 }
1044
1045 EmitCode (ec, true);
1046 }
1047
1048 public override void EmitStatement (EmitContext ec)
1049 {
1050 EmitCode (ec, false);
1051 }
1052
1053 //
1054 // Converts operator to System.Linq.Expressions.ExpressionType enum name
1055 //
1056 string GetOperatorExpressionTypeName ()
1057 {
1058 return IsDecrement ? "Decrement" : "Increment";
1059 }
1060
1061 bool IsDecrement {
1062 get { return (mode & Mode.IsDecrement) != 0; }
1063 }
1064
1065 //
1066 // Returns whether an object of type `t' can be incremented
1067 // or decremented with add/sub (ie, basically whether we can
1068 // use pre-post incr-decr operations on it, but it is not a
1069 // System.Decimal, which we require operator overloading to catch)
1070 //
1071 static bool IsPredefinedOperator (TypeSpec t)
1072 {
1073 return (TypeManager.IsPrimitiveType (t) && t != TypeManager.bool_type) ||
1074 TypeManager.IsEnumType (t) ||
1075 t.IsPointer && t != TypeManager.void_ptr_type;
1076 }
1077
1078 #if NET_4_0
1079 public override SLE.Expression MakeExpression (BuilderContext ctx)
1080 {
1081 var target = ((RuntimeValueExpression) expr).MetaObject.Expression;
1082 var source = SLE.Expression.Convert (operation.MakeExpression (ctx), target.Type);
1083 return SLE.Expression.Assign (target, source);
1084 }
1085 #endif
1086
1087 protected override void CloneTo (CloneContext clonectx, Expression t)
1088 {
1089 UnaryMutator target = (UnaryMutator) t;
1090
1091 target.expr = expr.Clone (clonectx);
1092 }
1093
1094 Expression ResolveOperator (ResolveContext ec)
1095 {
1096 if (expr is RuntimeValueExpression) {
1097 operation = expr;
1098 } else {
1099 // Use itself at the top of the stack
1100 operation = new EmptyExpression (type);
1101 }
1102
1103 //
1104 // The operand of the prefix/postfix increment decrement operators
1105 // should be an expression that is classified as a variable,
1106 // a property access or an indexer access
1107 //
1108 if (expr.eclass == ExprClass.Variable || expr.eclass == ExprClass.IndexerAccess || expr.eclass == ExprClass.PropertyAccess) {
1109 expr = expr.ResolveLValue (ec, expr);
1110 } else {
1111 ec.Report.Error (1059, loc, "The operand of an increment or decrement operator must be a variable, property or indexer");
1112 }
1113
1114 //
1115 // 1. Check predefined types
1116 //
1117 if (IsPredefinedOperator (type)) {
1118 // TODO: Move to IntConstant once I get rid of int32_type
1119 var one = new IntConstant (1, loc);
1120
1121 // TODO: Cache this based on type when using EmptyExpression in
1122 // context cache
1123 Binary.Operator op = IsDecrement ? Binary.Operator.Subtraction : Binary.Operator.Addition;
1124 operation = new Binary (op, operation, one, loc);
1125 operation = operation.Resolve (ec);
1126 if (operation != null && operation.Type != type)
1127 operation = Convert.ExplicitNumericConversion (operation, type);
1128
1129 return this;
1130 }
1131
1132 //
1133 // Step 2: Perform Operator Overload location
1134 //
1135 string op_name;
1136
1137 if (IsDecrement)
1138 op_name = Operator.GetMetadataName (Operator.OpType.Decrement);
1139 else
1140 op_name = Operator.GetMetadataName (Operator.OpType.Increment);
1141
1142 var mg = MethodLookup (ec.Compiler, ec.CurrentType, type, MemberKind.Operator, op_name, 0, loc);
1143
1144 if (mg != null) {
1145 Arguments args = new Arguments (1);
1146 args.Add (new Argument (expr));
1147 mg = mg.OverloadResolve (ec, ref args, false, loc);
1148 if (mg == null)
1149 return null;
1150
1151 args[0].Expr = operation;
1152 operation = new UserOperatorCall (mg, args, null, loc);
1153 operation = Convert.ImplicitConversionRequired (ec, operation, type, loc);
1154 return this;
1155 }
1156
1157 string name = IsDecrement ?
1158 Operator.GetName (Operator.OpType.Decrement) :
1159 Operator.GetName (Operator.OpType.Increment);
1160
1161 Unary.Error_OperatorCannotBeApplied (ec, loc, name, type);
1162 return null;
1163 }
1164 }
1165
1166 /// <summary>
1167 /// Base class for the `Is' and `As' classes.
1168 /// </summary>
1169 ///
1170 /// <remarks>
1171 /// FIXME: Split this in two, and we get to save the `Operator' Oper
1172 /// size.
1173 /// </remarks>
1174 public abstract class Probe : Expression {
1175 public Expression ProbeType;
1176 protected Expression expr;
1177 protected TypeExpr probe_type_expr;
1178
1179 public Probe (Expression expr, Expression probe_type, Location l)
1180 {
1181 ProbeType = probe_type;
1182 loc = l;
1183 this.expr = expr;
1184 }
1185
1186 public Expression Expr {
1187 get {
1188 return expr;
1189 }
1190 }
1191
1192 protected override Expression DoResolve (ResolveContext ec)
1193 {
1194 probe_type_expr = ProbeType.ResolveAsTypeTerminal (ec, false);
1195 if (probe_type_expr == null)
1196 return null;
1197
1198 expr = expr.Resolve (ec);
1199 if (expr == null)
1200 return null;
1201
1202 if (probe_type_expr.Type.IsStatic) {
1203 ec.Report.Error (-244, loc, "The `{0}' operator cannot be applied to an operand of a static type",
1204 OperatorName);
1205 }
1206
1207 if (expr.Type.IsPointer || probe_type_expr.Type.IsPointer) {
1208 ec.Report.Error (244, loc, "The `{0}' operator cannot be applied to an operand of pointer type",
1209 OperatorName);
1210 return null;
1211 }
1212
1213 if (expr.Type == InternalType.AnonymousMethod) {
1214 ec.Report.Error (837, loc, "The `{0}' operator cannot be applied to a lambda expression or anonymous method",
1215 OperatorName);
1216 return null;
1217 }
1218
1219 return this;
1220 }
1221
1222 protected abstract string OperatorName { get; }
1223
1224 protected override void CloneTo (CloneContext clonectx, Expression t)
1225 {
1226 Probe target = (Probe) t;
1227
1228 target.expr = expr.Clone (clonectx);
1229 target.ProbeType = ProbeType.Clone (clonectx);
1230 }
1231
1232 }
1233
1234 /// <summary>
1235 /// Implementation of the `is' operator.
1236 /// </summary>
1237 public class Is : Probe {
1238 Nullable.Unwrap expr_unwrap;
1239
1240 public Is (Expression expr, Expression probe_type, Location l)
1241 : base (expr, probe_type, l)
1242 {
1243 }
1244
1245 public override Expression CreateExpressionTree (ResolveContext ec)
1246 {
1247 Arguments args = Arguments.CreateForExpressionTree (ec, null,
1248 expr.CreateExpressionTree (ec),
1249 new TypeOf (probe_type_expr, loc));
1250
1251 return CreateExpressionFactoryCall (ec, "TypeIs", args);
1252 }
1253
1254 public override void Emit (EmitContext ec)
1255 {
1256 if (expr_unwrap != null) {
1257 expr_unwrap.EmitCheck (ec);
1258 return;
1259 }
1260
1261 expr.Emit (ec);
1262 ec.Emit (OpCodes.Isinst, probe_type_expr.Type);
1263 ec.Emit (OpCodes.Ldnull);
1264 ec.Emit (OpCodes.Cgt_Un);
1265 }
1266
1267 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
1268 {
1269 if (expr_unwrap != null) {
1270 expr_unwrap.EmitCheck (ec);
1271 } else {
1272 expr.Emit (ec);
1273 ec.Emit (OpCodes.Isinst, probe_type_expr.Type);
1274 }
1275 ec.Emit (on_true ? OpCodes.Brtrue : OpCodes.Brfalse, target);
1276 }
1277
1278 Expression CreateConstantResult (ResolveContext ec, bool result)
1279 {
1280 if (result)
1281 ec.Report.Warning (183, 1, loc, "The given expression is always of the provided (`{0}') type",
1282 TypeManager.CSharpName (probe_type_expr.Type));
1283 else
1284 ec.Report.Warning (184, 1, loc, "The given expression is never of the provided (`{0}') type",
1285 TypeManager.CSharpName (probe_type_expr.Type));
1286
1287 return ReducedExpression.Create (new BoolConstant (result, loc).Resolve (ec), this);
1288 }
1289
1290 protected override Expression DoResolve (ResolveContext ec)
1291 {
1292 if (base.DoResolve (ec) == null)
1293 return null;
1294
1295 TypeSpec d = expr.Type;
1296 bool d_is_nullable = false;
1297
1298 //
1299 // If E is a method group or the null literal, or if the type of E is a reference
1300 // type or a nullable type and the value of E is null, the result is false
1301 //
1302 if (expr.IsNull || expr.eclass == ExprClass.MethodGroup)
1303 return CreateConstantResult (ec, false);
1304
1305 if (TypeManager.IsNullableType (d)) {
1306 var ut = Nullable.NullableInfo.GetUnderlyingType (d);
1307 if (!ut.IsGenericParameter) {
1308 d = ut;
1309 d_is_nullable = true;
1310 }
1311 }
1312
1313 type = TypeManager.bool_type;
1314 eclass = ExprClass.Value;
1315 TypeSpec t = probe_type_expr.Type;
1316 bool t_is_nullable = false;
1317 if (TypeManager.IsNullableType (t)) {
1318 var ut = Nullable.NullableInfo.GetUnderlyingType (t);
1319 if (!ut.IsGenericParameter) {
1320 t = ut;
1321 t_is_nullable = true;
1322 }
1323 }
1324
1325 if (TypeManager.IsStruct (t)) {
1326 if (d == t) {
1327 //
1328 // D and T are the same value types but D can be null
1329 //
1330 if (d_is_nullable && !t_is_nullable) {
1331 expr_unwrap = Nullable.Unwrap.Create (expr, false);
1332 return this;
1333 }
1334
1335 //
1336 // The result is true if D and T are the same value types
1337 //
1338 return CreateConstantResult (ec, true);
1339 }
1340
1341 var tp = d as TypeParameterSpec;
1342 if (tp != null)
1343 return ResolveGenericParameter (ec, t, tp);
1344
1345 //
1346 // An unboxing conversion exists
1347 //
1348 if (Convert.ExplicitReferenceConversionExists (d, t))
1349 return this;
1350 } else {
1351 if (TypeManager.IsGenericParameter (t))
1352 return ResolveGenericParameter (ec, d, (TypeParameterSpec) t);
1353
1354 if (TypeManager.IsStruct (d)) {
1355 if (Convert.ImplicitBoxingConversion (null, d, t) != null)
1356 return CreateConstantResult (ec, true);
1357 } else {
1358 if (TypeManager.IsGenericParameter (d))
1359 return ResolveGenericParameter (ec, t, (TypeParameterSpec) d);
1360
1361 if (TypeManager.ContainsGenericParameters (d))
1362 return this;
1363
1364 if (Convert.ImplicitReferenceConversionExists (expr, t) ||
1365 Convert.ExplicitReferenceConversionExists (d, t)) {
1366 return this;
1367 }
1368 }
1369 }
1370
1371 return CreateConstantResult (ec, false);
1372 }
1373
1374 Expression ResolveGenericParameter (ResolveContext ec, TypeSpec d, TypeParameterSpec t)
1375 {
1376 if (t.IsReferenceType) {
1377 if (TypeManager.IsStruct (d))
1378 return CreateConstantResult (ec, false);
1379 }
1380
1381 if (TypeManager.IsGenericParameter (expr.Type)) {
1382 if (t.IsValueType && expr.Type == t)
1383 return CreateConstantResult (ec, true);
1384
1385 expr = new BoxedCast (expr, d);
1386 }
1387
1388 return this;
1389 }
1390
1391 protected override string OperatorName {
1392 get { return "is"; }
1393 }
1394 }
1395
1396 /// <summary>
1397 /// Implementation of the `as' operator.
1398 /// </summary>
1399 public class As : Probe {
1400 bool do_isinst;
1401 Expression resolved_type;
1402
1403 public As (Expression expr, Expression probe_type, Location l)
1404 : base (expr, probe_type, l)
1405 {
1406 }
1407
1408 public override Expression CreateExpressionTree (ResolveContext ec)
1409 {
1410 Arguments args = Arguments.CreateForExpressionTree (ec, null,
1411 expr.CreateExpressionTree (ec),
1412 new TypeOf (probe_type_expr, loc));
1413
1414 return CreateExpressionFactoryCall (ec, "TypeAs", args);
1415 }
1416
1417 public override void Emit (EmitContext ec)
1418 {
1419 expr.Emit (ec);
1420
1421 if (do_isinst)
1422 ec.Emit (OpCodes.Isinst, type);
1423
1424 if (TypeManager.IsGenericParameter (type) || TypeManager.IsNullableType (type))
1425 ec.Emit (OpCodes.Unbox_Any, type);
1426 }
1427
1428 protected override Expression DoResolve (ResolveContext ec)
1429 {
1430 if (resolved_type == null) {
1431 resolved_type = base.DoResolve (ec);
1432
1433 if (resolved_type == null)
1434 return null;
1435 }
1436
1437 type = probe_type_expr.Type;
1438 eclass = ExprClass.Value;
1439 TypeSpec etype = expr.Type;
1440
1441 if (!TypeManager.IsReferenceType (type) && !TypeManager.IsNullableType (type)) {
1442 if (TypeManager.IsGenericParameter (type)) {
1443 ec.Report.Error (413, loc,
1444 "The `as' operator cannot be used with a non-reference type parameter `{0}'. Consider adding `class' or a reference type constraint",
1445 probe_type_expr.GetSignatureForError ());
1446 } else {
1447 ec.Report.Error (77, loc,
1448 "The `as' operator cannot be used with a non-nullable value type `{0}'",
1449 TypeManager.CSharpName (type));
1450 }
1451 return null;
1452 }
1453
1454 if (expr.IsNull && TypeManager.IsNullableType (type)) {
1455 return Nullable.LiftedNull.CreateFromExpression (ec, this);
1456 }
1457
1458 Expression e = Convert.ImplicitConversion (ec, expr, type, loc);
1459 if (e != null){
1460 expr = e;
1461 do_isinst = false;
1462 return this;
1463 }
1464
1465 if (Convert.ExplicitReferenceConversionExists (etype, type)){
1466 if (TypeManager.IsGenericParameter (etype))
1467 expr = new BoxedCast (expr, etype);
1468
1469 do_isinst = true;
1470 return this;
1471 }
1472
1473 if (TypeManager.ContainsGenericParameters (etype) ||
1474 TypeManager.ContainsGenericParameters (type)) {
1475 expr = new BoxedCast (expr, etype);
1476 do_isinst = true;
1477 return this;
1478 }
1479
1480 ec.Report.Error (39, loc, "Cannot convert type `{0}' to `{1}' via a built-in conversion",
1481 TypeManager.CSharpName (etype), TypeManager.CSharpName (type));
1482
1483 return null;
1484 }
1485
1486 protected override string OperatorName {
1487 get { return "as"; }
1488 }
1489 }
1490
1491 /// <summary>
1492 /// This represents a typecast in the source language.
1493 ///
1494 /// FIXME: Cast expressions have an unusual set of parsing
1495 /// rules, we need to figure those out.
1496 /// </summary>
1497 public class Cast : ShimExpression {
1498 Expression target_type;
1499
1500 public Cast (Expression cast_type, Expression expr)
1501 : this (cast_type, expr, cast_type.Location)
1502 {
1503 }
1504
1505 public Cast (Expression cast_type, Expression expr, Location loc)
1506 : base (expr)
1507 {
1508 this.target_type = cast_type;
1509 this.loc = loc;
1510 }
1511
1512 public Expression TargetType {
1513 get { return target_type; }
1514 }
1515
1516 protected override Expression DoResolve (ResolveContext ec)
1517 {
1518 expr = expr.Resolve (ec);
1519 if (expr == null)
1520 return null;
1521
1522 TypeExpr target = target_type.ResolveAsTypeTerminal (ec, false);
1523 if (target == null)
1524 return null;
1525
1526 type = target.Type;
1527
1528 if (type.IsStatic) {
1529 ec.Report.Error (716, loc, "Cannot convert to static type `{0}'", TypeManager.CSharpName (type));
1530 return null;
1531 }
1532
1533 eclass = ExprClass.Value;
1534
1535 Constant c = expr as Constant;
1536 if (c != null) {
1537 c = c.TryReduce (ec, type, loc);
1538 if (c != null)
1539 return c;
1540 }
1541
1542 if (type.IsPointer && !ec.IsUnsafe) {
1543 UnsafeError (ec, loc);
1544 } else if (expr.Type == InternalType.Dynamic) {
1545 Arguments arg = new Arguments (1);
1546 arg.Add (new Argument (expr));
1547 return new DynamicConversion (type, CSharpBinderFlags.ConvertExplicit, arg, loc).Resolve (ec);
1548 }
1549
1550 expr = Convert.ExplicitConversion (ec, expr, type, loc);
1551 return expr;
1552 }
1553
1554 protected override void CloneTo (CloneContext clonectx, Expression t)
1555 {
1556 Cast target = (Cast) t;
1557
1558 target.target_type = target_type.Clone (clonectx);
1559 target.expr = expr.Clone (clonectx);
1560 }
1561 }
1562
1563 public class ImplicitCast : ShimExpression
1564 {
1565 bool arrayAccess;
1566
1567 public ImplicitCast (Expression expr, TypeSpec target, bool arrayAccess)
1568 : base (expr)
1569 {
1570 this.loc = expr.Location;
1571 this.type = target;
1572 this.arrayAccess = arrayAccess;
1573 }
1574
1575 protected override Expression DoResolve (ResolveContext ec)
1576 {
1577 expr = expr.Resolve (ec);
1578 if (expr == null)
1579 return null;
1580
1581 if (arrayAccess)
1582 expr = ConvertExpressionToArrayIndex (ec, expr);
1583 else
1584 expr = Convert.ImplicitConversionRequired (ec, expr, type, loc);
1585
1586 return expr;
1587 }
1588 }
1589
1590 //
1591 // C# 2.0 Default value expression
1592 //
1593 public class DefaultValueExpression : Expression
1594 {
1595 Expression expr;
1596
1597 public DefaultValueExpression (Expression expr, Location loc)
1598 {
1599 this.expr = expr;
1600 this.loc = loc;
1601 }
1602
1603 public override Expression CreateExpressionTree (ResolveContext ec)
1604 {
1605 Arguments args = new Arguments (2);
1606 args.Add (new Argument (this));
1607 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
1608 return CreateExpressionFactoryCall (ec, "Constant", args);
1609 }
1610
1611 protected override Expression DoResolve (ResolveContext ec)
1612 {
1613 TypeExpr texpr = expr.ResolveAsTypeTerminal (ec, false);
1614 if (texpr == null)
1615 return null;
1616
1617 type = texpr.Type;
1618
1619 if (type.IsStatic) {
1620 ec.Report.Error (-244, loc, "The `default value' operator cannot be applied to an operand of a static type");
1621 }
1622
1623 if (type.IsPointer)
1624 return new NullLiteral (Location).ConvertImplicitly (ec, type);
1625
1626 if (TypeManager.IsReferenceType (type))
1627 return new NullConstant (type, loc);
1628
1629 Constant c = New.Constantify (type);
1630 if (c != null)
1631 return c.Resolve (ec);
1632
1633 eclass = ExprClass.Variable;
1634 return this;
1635 }
1636
1637 public override void Emit (EmitContext ec)
1638 {
1639 LocalTemporary temp_storage = new LocalTemporary(type);
1640
1641 temp_storage.AddressOf(ec, AddressOp.LoadStore);
1642 ec.Emit(OpCodes.Initobj, type);
1643 temp_storage.Emit(ec);
1644 }
1645
1646 protected override void CloneTo (CloneContext clonectx, Expression t)
1647 {
1648 DefaultValueExpression target = (DefaultValueExpression) t;
1649
1650 target.expr = expr.Clone (clonectx);
1651 }
1652 }
1653
1654 /// <summary>
1655 /// Binary operators
1656 /// </summary>
1657 public class Binary : Expression, IDynamicBinder
1658 {
1659 protected class PredefinedOperator {
1660 protected readonly TypeSpec left;
1661 protected readonly TypeSpec right;
1662 public readonly Operator OperatorsMask;
1663 public TypeSpec ReturnType;
1664
1665 public PredefinedOperator (TypeSpec ltype, TypeSpec rtype, Operator op_mask)
1666 : this (ltype, rtype, op_mask, ltype)
1667 {
1668 }
1669
1670 public PredefinedOperator (TypeSpec type, Operator op_mask, TypeSpec return_type)
1671 : this (type, type, op_mask, return_type)
1672 {
1673 }
1674
1675 public PredefinedOperator (TypeSpec type, Operator op_mask)
1676 : this (type, type, op_mask, type)
1677 {
1678 }
1679
1680 public PredefinedOperator (TypeSpec ltype, TypeSpec rtype, Operator op_mask, TypeSpec return_type)
1681 {
1682 if ((op_mask & Operator.ValuesOnlyMask) != 0)
1683 throw new InternalErrorException ("Only masked values can be used");
1684
1685 this.left = ltype;
1686 this.right = rtype;
1687 this.OperatorsMask = op_mask;
1688 this.ReturnType = return_type;
1689 }
1690
1691 public virtual Expression ConvertResult (ResolveContext ec, Binary b)
1692 {
1693 b.type = ReturnType;
1694
1695 b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
1696 b.right = Convert.ImplicitConversion (ec, b.right, right, b.right.Location);
1697
1698 //
1699 // A user operators does not support multiple user conversions, but decimal type
1700 // is considered to be predefined type therefore we apply predefined operators rules
1701 // and then look for decimal user-operator implementation
1702 //
1703 if (left == TypeManager.decimal_type)
1704 return b.ResolveUserOperator (ec, b.left.Type, b.right.Type);
1705
1706 var c = b.right as Constant;
1707 if (c != null) {
1708 if (c.IsDefaultValue && (b.oper == Operator.Addition || b.oper == Operator.BitwiseOr || b.oper == Operator.Subtraction))
1709 return ReducedExpression.Create (b.left, b).Resolve (ec);
1710 if ((b.oper == Operator.Multiply || b.oper == Operator.Division) && c.IsOneInteger)
1711 return ReducedExpression.Create (b.left, b).Resolve (ec);
1712 return b;
1713 }
1714
1715 c = b.left as Constant;
1716 if (c != null) {
1717 if (c.IsDefaultValue && (b.oper == Operator.Addition || b.oper == Operator.BitwiseOr))
1718 return ReducedExpression.Create (b.right, b).Resolve (ec);
1719 if (b.oper == Operator.Multiply && c.IsOneInteger)
1720 return ReducedExpression.Create (b.right, b).Resolve (ec);
1721 return b;
1722 }
1723
1724 return b;
1725 }
1726
1727 public bool IsPrimitiveApplicable (TypeSpec ltype, TypeSpec rtype)
1728 {
1729 //
1730 // We are dealing with primitive types only
1731 //
1732 return left == ltype && ltype == rtype;
1733 }
1734
1735 public virtual bool IsApplicable (ResolveContext ec, Expression lexpr, Expression rexpr)
1736 {
1737 if (TypeManager.IsEqual (left, lexpr.Type) &&
1738 TypeManager.IsEqual (right, rexpr.Type))
1739 return true;
1740
1741 return Convert.ImplicitConversionExists (ec, lexpr, left) &&
1742 Convert.ImplicitConversionExists (ec, rexpr, right);
1743 }
1744
1745 public PredefinedOperator ResolveBetterOperator (ResolveContext ec, PredefinedOperator best_operator)
1746 {
1747 int result = 0;
1748 if (left != null && best_operator.left != null) {
1749 result = MethodGroupExpr.BetterTypeConversion (ec, best_operator.left, left);
1750 }
1751
1752 //
1753 // When second arguments are same as the first one, the result is same
1754 //
1755 if (right != null && (left != right || best_operator.left != best_operator.right)) {
1756 result |= MethodGroupExpr.BetterTypeConversion (ec, best_operator.right, right);
1757 }
1758
1759 if (result == 0 || result > 2)
1760 return null;
1761
1762 return result == 1 ? best_operator : this;
1763 }
1764 }
1765
1766 class PredefinedStringOperator : PredefinedOperator {
1767 public PredefinedStringOperator (TypeSpec type, Operator op_mask)
1768 : base (type, op_mask, type)
1769 {
1770 ReturnType = TypeManager.string_type;
1771 }
1772
1773 public PredefinedStringOperator (TypeSpec ltype, TypeSpec rtype, Operator op_mask)
1774 : base (ltype, rtype, op_mask)
1775 {
1776 ReturnType = TypeManager.string_type;
1777 }
1778
1779 public override Expression ConvertResult (ResolveContext ec, Binary b)
1780 {
1781 //
1782 // Use original expression for nullable arguments
1783 //
1784 Nullable.Unwrap unwrap = b.left as Nullable.Unwrap;
1785 if (unwrap != null)
1786 b.left = unwrap.Original;
1787
1788 unwrap = b.right as Nullable.Unwrap;
1789 if (unwrap != null)
1790 b.right = unwrap.Original;
1791
1792 b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
1793 b.right = Convert.ImplicitConversion (ec, b.right, right, b.right.Location);
1794
1795 //
1796 // Start a new concat expression using converted expression
1797 //
1798 return StringConcat.Create (ec, b.left, b.right, b.loc);
1799 }
1800 }
1801
1802 class PredefinedShiftOperator : PredefinedOperator {
1803 public PredefinedShiftOperator (TypeSpec ltype, Operator op_mask) :
1804 base (ltype, TypeManager.int32_type, op_mask)
1805 {
1806 }
1807
1808 public override Expression ConvertResult (ResolveContext ec, Binary b)
1809 {
1810 b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
1811
1812 Expression expr_tree_expr = Convert.ImplicitConversion (ec, b.right, TypeManager.int32_type, b.right.Location);
1813
1814 int right_mask = left == TypeManager.int32_type || left == TypeManager.uint32_type ? 0x1f : 0x3f;
1815
1816 //
1817 // b = b.left >> b.right & (0x1f|0x3f)
1818 //
1819 b.right = new Binary (Operator.BitwiseAnd,
1820 b.right, new IntConstant (right_mask, b.right.Location), b.loc).Resolve (ec);
1821
1822 //
1823 // Expression tree representation does not use & mask
1824 //
1825 b.right = ReducedExpression.Create (b.right, expr_tree_expr).Resolve (ec);
1826 b.type = ReturnType;
1827
1828 //
1829 // Optimize shift by 0
1830 //
1831 var c = b.right as Constant;
1832 if (c != null && c.IsDefaultValue)
1833 return ReducedExpression.Create (b.left, b).Resolve (ec);
1834
1835 return b;
1836 }
1837 }
1838
1839 class PredefinedPointerOperator : PredefinedOperator {
1840 public PredefinedPointerOperator (TypeSpec ltype, TypeSpec rtype, Operator op_mask)
1841 : base (ltype, rtype, op_mask)
1842 {
1843 }
1844
1845 public PredefinedPointerOperator (TypeSpec ltype, TypeSpec rtype, Operator op_mask, TypeSpec retType)
1846 : base (ltype, rtype, op_mask, retType)
1847 {
1848 }
1849
1850 public PredefinedPointerOperator (TypeSpec type, Operator op_mask, TypeSpec return_type)
1851 : base (type, op_mask, return_type)
1852 {
1853 }
1854
1855 public override bool IsApplicable (ResolveContext ec, Expression lexpr, Expression rexpr)
1856 {
1857 if (left == null) {
1858 if (!lexpr.Type.IsPointer)
1859 return false;
1860 } else {
1861 if (!Convert.ImplicitConversionExists (ec, lexpr, left))
1862 return false;
1863 }
1864
1865 if (right == null) {
1866 if (!rexpr.Type.IsPointer)
1867 return false;
1868 } else {
1869 if (!Convert.ImplicitConversionExists (ec, rexpr, right))
1870 return false;
1871 }
1872
1873 return true;
1874 }
1875
1876 public override Expression ConvertResult (ResolveContext ec, Binary b)
1877 {
1878 if (left != null) {
1879 b.left = EmptyCast.Create (b.left, left);
1880 } else if (right != null) {
1881 b.right = EmptyCast.Create (b.right, right);
1882 }
1883
1884 TypeSpec r_type = ReturnType;
1885 Expression left_arg, right_arg;
1886 if (r_type == null) {
1887 if (left == null) {
1888 left_arg = b.left;
1889 right_arg = b.right;
1890 r_type = b.left.Type;
1891 } else {
1892 left_arg = b.right;
1893 right_arg = b.left;
1894 r_type = b.right.Type;
1895 }
1896 } else {
1897 left_arg = b.left;
1898 right_arg = b.right;
1899 }
1900
1901 return new PointerArithmetic (b.oper, left_arg, right_arg, r_type, b.loc).Resolve (ec);
1902 }
1903 }
1904
1905 [Flags]
1906 public enum Operator {
1907 Multiply = 0 | ArithmeticMask,
1908 Division = 1 | ArithmeticMask,
1909 Modulus = 2 | ArithmeticMask,
1910 Addition = 3 | ArithmeticMask | AdditionMask,
1911 Subtraction = 4 | ArithmeticMask | SubtractionMask,
1912
1913 LeftShift = 5 | ShiftMask,
1914 RightShift = 6 | ShiftMask,
1915
1916 LessThan = 7 | ComparisonMask | RelationalMask,
1917 GreaterThan = 8 | ComparisonMask | RelationalMask,
1918 LessThanOrEqual = 9 | ComparisonMask | RelationalMask,
1919 GreaterThanOrEqual = 10 | ComparisonMask | RelationalMask,
1920 Equality = 11 | ComparisonMask | EqualityMask,
1921 Inequality = 12 | ComparisonMask | EqualityMask,
1922
1923 BitwiseAnd = 13 | BitwiseMask,
1924 ExclusiveOr = 14 | BitwiseMask,
1925 BitwiseOr = 15 | BitwiseMask,
1926
1927 LogicalAnd = 16 | LogicalMask,
1928 LogicalOr = 17 | LogicalMask,
1929
1930 //
1931 // Operator masks
1932 //
1933 ValuesOnlyMask = ArithmeticMask - 1,
1934 ArithmeticMask = 1 << 5,
1935 ShiftMask = 1 << 6,
1936 ComparisonMask = 1 << 7,
1937 EqualityMask = 1 << 8,
1938 BitwiseMask = 1 << 9,
1939 LogicalMask = 1 << 10,
1940 AdditionMask = 1 << 11,
1941 SubtractionMask = 1 << 12,
1942 RelationalMask = 1 << 13
1943 }
1944
1945 readonly Operator oper;
1946 protected Expression left, right;
1947 readonly bool is_compound;
1948 Expression enum_conversion;
1949
1950 static PredefinedOperator[] standard_operators;
1951 static PredefinedOperator[] pointer_operators;
1952
1953 public Binary (Operator oper, Expression left, Expression right, bool isCompound, Location loc)
1954 : this (oper, left, right, loc)
1955 {
1956 this.is_compound = isCompound;
1957 }
1958
1959 public Binary (Operator oper, Expression left, Expression right, Location loc)
1960 {
1961 this.oper = oper;
1962 this.left = left;
1963 this.right = right;
1964 this.loc = loc;
1965 }
1966
1967 public Operator Oper {
1968 get {
1969 return oper;
1970 }
1971 }
1972
1973 /// <summary>
1974 /// Returns a stringified representation of the Operator
1975 /// </summary>
1976 string OperName (Operator oper)
1977 {
1978 string s;
1979 switch (oper){
1980 case Operator.Multiply:
1981 s = "*";
1982 break;
1983 case Operator.Division:
1984 s = "/";
1985 break;
1986 case Operator.Modulus:
1987 s = "%";
1988 break;
1989 case Operator.Addition:
1990 s = "+";
1991 break;
1992 case Operator.Subtraction:
1993 s = "-";
1994 break;
1995 case Operator.LeftShift:
1996 s = "<<";
1997 break;
1998 case Operator.RightShift:
1999 s = ">>";
2000 break;
2001 case Operator.LessThan:
2002 s = "<";
2003 break;
2004 case Operator.GreaterThan:
2005 s = ">";
2006 break;
2007 case Operator.LessThanOrEqual:
2008 s = "<=";
2009 break;
2010 case Operator.GreaterThanOrEqual:
2011 s = ">=";
2012 break;
2013 case Operator.Equality:
2014 s = "==";
2015 break;
2016 case Operator.Inequality:
2017 s = "!=";
2018 break;
2019 case Operator.BitwiseAnd:
2020 s = "&";
2021 break;
2022 case Operator.BitwiseOr:
2023 s = "|";
2024 break;
2025 case Operator.ExclusiveOr:
2026 s = "^";
2027 break;
2028 case Operator.LogicalOr:
2029 s = "||";
2030 break;
2031 case Operator.LogicalAnd:
2032 s = "&&";
2033 break;
2034 default:
2035 s = oper.ToString ();
2036 break;
2037 }
2038
2039 if (is_compound)
2040 return s + "=";
2041
2042 return s;
2043 }
2044
2045 public static void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right, Operator oper, Location loc)
2046 {
2047 new Binary (oper, left, right, loc).Error_OperatorCannotBeApplied (ec, left, right);
2048 }
2049
2050 public static void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right, string oper, Location loc)
2051 {
2052 string l, r;
2053 l = TypeManager.CSharpName (left.Type);
2054 r = TypeManager.CSharpName (right.Type);
2055
2056 ec.Report.Error (19, loc, "Operator `{0}' cannot be applied to operands of type `{1}' and `{2}'",
2057 oper, l, r);
2058 }
2059
2060 protected void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right)
2061 {
2062 Error_OperatorCannotBeApplied (ec, left, right, OperName (oper), loc);
2063 }
2064
2065 //
2066 // Converts operator to System.Linq.Expressions.ExpressionType enum name
2067 //
2068 string GetOperatorExpressionTypeName ()
2069 {
2070 switch (oper) {
2071 case Operator.Addition:
2072 return is_compound ? "AddAssign" : "Add";
2073 case Operator.BitwiseAnd:
2074 return is_compound ? "AndAssign" : "And";
2075 case Operator.BitwiseOr:
2076 return is_compound ? "OrAssign" : "Or";
2077 case Operator.Division:
2078 return is_compound ? "DivideAssign" : "Divide";
2079 case Operator.ExclusiveOr:
2080 return is_compound ? "ExclusiveOrAssign" : "ExclusiveOr";
2081 case Operator.Equality:
2082 return "Equal";
2083 case Operator.GreaterThan:
2084 return "GreaterThan";
2085 case Operator.GreaterThanOrEqual:
2086 return "GreaterThanOrEqual";
2087 case Operator.Inequality:
2088 return "NotEqual";
2089 case Operator.LeftShift:
2090 return is_compound ? "LeftShiftAssign" : "LeftShift";
2091 case Operator.LessThan:
2092 return "LessThan";
2093 case Operator.LessThanOrEqual:
2094 return "LessThanOrEqual";
2095 case Operator.LogicalAnd:
2096 return "And";
2097 case Operator.LogicalOr:
2098 return "Or";
2099 case Operator.Modulus:
2100 return is_compound ? "ModuloAssign" : "Modulo";
2101 case Operator.Multiply:
2102 return is_compound ? "MultiplyAssign" : "Multiply";
2103 case Operator.RightShift:
2104 return is_compound ? "RightShiftAssign" : "RightShift";
2105 case Operator.Subtraction:
2106 return is_compound ? "SubtractAssign" : "Subtract";
2107 default:
2108 throw new NotImplementedException ("Unknown expression type operator " + oper.ToString ());
2109 }
2110 }
2111
2112 static string GetOperatorMetadataName (Operator op)
2113 {
2114 CSharp.Operator.OpType op_type;
2115 switch (op) {
2116 case Operator.Addition:
2117 op_type = CSharp.Operator.OpType.Addition; break;
2118 case Operator.BitwiseAnd:
2119 op_type = CSharp.Operator.OpType.BitwiseAnd; break;
2120 case Operator.BitwiseOr:
2121 op_type = CSharp.Operator.OpType.BitwiseOr; break;
2122 case Operator.Division:
2123 op_type = CSharp.Operator.OpType.Division; break;
2124 case Operator.Equality:
2125 op_type = CSharp.Operator.OpType.Equality; break;
2126 case Operator.ExclusiveOr:
2127 op_type = CSharp.Operator.OpType.ExclusiveOr; break;
2128 case Operator.GreaterThan:
2129 op_type = CSharp.Operator.OpType.GreaterThan; break;
2130 case Operator.GreaterThanOrEqual:
2131 op_type = CSharp.Operator.OpType.GreaterThanOrEqual; break;
2132 case Operator.Inequality:
2133 op_type = CSharp.Operator.OpType.Inequality; break;
2134 case Operator.LeftShift:
2135 op_type = CSharp.Operator.OpType.LeftShift; break;
2136 case Operator.LessThan:
2137 op_type = CSharp.Operator.OpType.LessThan; break;
2138 case Operator.LessThanOrEqual:
2139 op_type = CSharp.Operator.OpType.LessThanOrEqual; break;
2140 case Operator.Modulus:
2141 op_type = CSharp.Operator.OpType.Modulus; break;
2142 case Operator.Multiply:
2143 op_type = CSharp.Operator.OpType.Multiply; break;
2144 case Operator.RightShift:
2145 op_type = CSharp.Operator.OpType.RightShift; break;
2146 case Operator.Subtraction:
2147 op_type = CSharp.Operator.OpType.Subtraction; break;
2148 default:
2149 throw new InternalErrorException (op.ToString ());
2150 }
2151
2152 return CSharp.Operator.GetMetadataName (op_type);
2153 }
2154
2155 public static void EmitOperatorOpcode (EmitContext ec, Operator oper, TypeSpec l)
2156 {
2157 OpCode opcode;
2158
2159 switch (oper){
2160 case Operator.Multiply:
2161 if (ec.HasSet (EmitContext.Options.CheckedScope)) {
2162 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2163 opcode = OpCodes.Mul_Ovf;
2164 else if (!IsFloat (l))
2165 opcode = OpCodes.Mul_Ovf_Un;
2166 else
2167 opcode = OpCodes.Mul;
2168 } else
2169 opcode = OpCodes.Mul;
2170
2171 break;
2172
2173 case Operator.Division:
2174 if (IsUnsigned (l))
2175 opcode = OpCodes.Div_Un;
2176 else
2177 opcode = OpCodes.Div;
2178 break;
2179
2180 case Operator.Modulus:
2181 if (IsUnsigned (l))
2182 opcode = OpCodes.Rem_Un;
2183 else
2184 opcode = OpCodes.Rem;
2185 break;
2186
2187 case Operator.Addition:
2188 if (ec.HasSet (EmitContext.Options.CheckedScope)) {
2189 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2190 opcode = OpCodes.Add_Ovf;
2191 else if (!IsFloat (l))
2192 opcode = OpCodes.Add_Ovf_Un;
2193 else
2194 opcode = OpCodes.Add;
2195 } else
2196 opcode = OpCodes.Add;
2197 break;
2198
2199 case Operator.Subtraction:
2200 if (ec.HasSet (EmitContext.Options.CheckedScope)) {
2201 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2202 opcode = OpCodes.Sub_Ovf;
2203 else if (!IsFloat (l))
2204 opcode = OpCodes.Sub_Ovf_Un;
2205 else
2206 opcode = OpCodes.Sub;
2207 } else
2208 opcode = OpCodes.Sub;
2209 break;
2210
2211 case Operator.RightShift:
2212 if (IsUnsigned (l))
2213 opcode = OpCodes.Shr_Un;
2214 else
2215 opcode = OpCodes.Shr;
2216 break;
2217
2218 case Operator.LeftShift:
2219 opcode = OpCodes.Shl;
2220 break;
2221
2222 case Operator.Equality:
2223 opcode = OpCodes.Ceq;
2224 break;
2225
2226 case Operator.Inequality:
2227 ec.Emit (OpCodes.Ceq);
2228 ec.Emit (OpCodes.Ldc_I4_0);
2229
2230 opcode = OpCodes.Ceq;
2231 break;
2232
2233 case Operator.LessThan:
2234 if (IsUnsigned (l))
2235 opcode = OpCodes.Clt_Un;
2236 else
2237 opcode = OpCodes.Clt;
2238 break;
2239
2240 case Operator.GreaterThan:
2241 if (IsUnsigned (l))
2242 opcode = OpCodes.Cgt_Un;
2243 else
2244 opcode = OpCodes.Cgt;
2245 break;
2246
2247 case Operator.LessThanOrEqual:
2248 if (IsUnsigned (l) || IsFloat (l))
2249 ec.Emit (OpCodes.Cgt_Un);
2250 else
2251 ec.Emit (OpCodes.Cgt);
2252 ec.Emit (OpCodes.Ldc_I4_0);
2253
2254 opcode = OpCodes.Ceq;
2255 break;
2256
2257 case Operator.GreaterThanOrEqual:
2258 if (IsUnsigned (l) || IsFloat (l))
2259 ec.Emit (OpCodes.Clt_Un);
2260 else
2261 ec.Emit (OpCodes.Clt);
2262
2263 ec.Emit (OpCodes.Ldc_I4_0);
2264
2265 opcode = OpCodes.Ceq;
2266 break;
2267
2268 case Operator.BitwiseOr:
2269 opcode = OpCodes.Or;
2270 break;
2271
2272 case Operator.BitwiseAnd:
2273 opcode = OpCodes.And;
2274 break;
2275
2276 case Operator.ExclusiveOr:
2277 opcode = OpCodes.Xor;
2278 break;
2279
2280 default:
2281 throw new InternalErrorException (oper.ToString ());
2282 }
2283
2284 ec.Emit (opcode);
2285 }
2286
2287 static bool IsUnsigned (TypeSpec t)
2288 {
2289 if (t.IsPointer)
2290 return true;
2291
2292 return (t == TypeManager.uint32_type || t == TypeManager.uint64_type ||
2293 t == TypeManager.ushort_type || t == TypeManager.byte_type);
2294 }
2295
2296 static bool IsFloat (TypeSpec t)
2297 {
2298 return t == TypeManager.float_type || t == TypeManager.double_type;
2299 }
2300
2301 public static void Reset ()
2302 {
2303 pointer_operators = standard_operators = null;
2304 }
2305
2306 Expression ResolveOperator (ResolveContext ec)
2307 {
2308 TypeSpec l = left.Type;
2309 TypeSpec r = right.Type;
2310 Expression expr;
2311 bool primitives_only = false;
2312
2313 if (standard_operators == null)
2314 CreateStandardOperatorsTable ();
2315
2316 //
2317 // Handles predefined primitive types
2318 //
2319 if (TypeManager.IsPrimitiveType (l) && TypeManager.IsPrimitiveType (r)) {
2320 if ((oper & Operator.ShiftMask) == 0) {
2321 if (l != TypeManager.bool_type && !DoBinaryOperatorPromotion (ec))
2322 return null;
2323
2324 primitives_only = true;
2325 }
2326 } else {
2327 // Pointers
2328 if (l.IsPointer || r.IsPointer)
2329 return ResolveOperatorPointer (ec, l, r);
2330
2331 // Enums
2332 bool lenum = TypeManager.IsEnumType (l);
2333 bool renum = TypeManager.IsEnumType (r);
2334 if (lenum || renum) {
2335 expr = ResolveOperatorEnum (ec, lenum, renum, l, r);
2336
2337 // TODO: Can this be ambiguous
2338 if (expr != null)
2339 return expr;
2340 }
2341
2342 // Delegates
2343 if ((oper == Operator.Addition || oper == Operator.Subtraction || (oper & Operator.EqualityMask) != 0) &&
2344 (TypeManager.IsDelegateType (l) || TypeManager.IsDelegateType (r))) {
2345
2346 expr = ResolveOperatorDelegate (ec, l, r);
2347
2348 // TODO: Can this be ambiguous
2349 if (expr != null)
2350 return expr;
2351 }
2352
2353 // User operators
2354 expr = ResolveUserOperator (ec, l, r);
2355 if (expr != null)
2356 return expr;
2357
2358 // Predefined reference types equality
2359 if ((oper & Operator.EqualityMask) != 0) {
2360 expr = ResolveOperatorEqualityRerefence (ec, l, r);
2361 if (expr != null)
2362 return expr;
2363 }
2364 }
2365
2366 return ResolveOperatorPredefined (ec, standard_operators, primitives_only, null);
2367 }
2368
2369 // at least one of 'left' or 'right' is an enumeration constant (EnumConstant or SideEffectConstant or ...)
2370 // if 'left' is not an enumeration constant, create one from the type of 'right'
2371 Constant EnumLiftUp (ResolveContext ec, Constant left, Constant right, Location loc)
2372 {
2373 switch (oper) {
2374 case Operator.BitwiseOr:
2375 case Operator.BitwiseAnd:
2376 case Operator.ExclusiveOr:
2377 case Operator.Equality:
2378 case Operator.Inequality:
2379 case Operator.LessThan:
2380 case Operator.LessThanOrEqual:
2381 case Operator.GreaterThan:
2382 case Operator.GreaterThanOrEqual:
2383 if (TypeManager.IsEnumType (left.Type))
2384 return left;
2385
2386 if (left.IsZeroInteger)
2387 return left.TryReduce (ec, right.Type, loc);
2388
2389 break;
2390
2391 case Operator.Addition:
2392 case Operator.Subtraction:
2393 return left;
2394
2395 case Operator.Multiply:
2396 case Operator.Division:
2397 case Operator.Modulus:
2398 case Operator.LeftShift:
2399 case Operator.RightShift:
2400 if (TypeManager.IsEnumType (right.Type) || TypeManager.IsEnumType (left.Type))
2401 break;
2402 return left;
2403 }
2404 Error_OperatorCannotBeApplied (ec, this.left, this.right);
2405 return null;
2406 }
2407
2408 //
2409 // The `|' operator used on types which were extended is dangerous
2410 //
2411 void CheckBitwiseOrOnSignExtended (ResolveContext ec)
2412 {
2413 OpcodeCast lcast = left as OpcodeCast;
2414 if (lcast != null) {
2415 if (IsUnsigned (lcast.UnderlyingType))
2416 lcast = null;
2417 }
2418
2419 OpcodeCast rcast = right as OpcodeCast;
2420 if (rcast != null) {
2421 if (IsUnsigned (rcast.UnderlyingType))
2422 rcast = null;
2423 }
2424
2425 if (lcast == null && rcast == null)
2426 return;
2427
2428 // FIXME: consider constants
2429
2430 ec.Report.Warning (675, 3, loc,
2431 "The operator `|' used on the sign-extended type `{0}'. Consider casting to a smaller unsigned type first",
2432 TypeManager.CSharpName (lcast != null ? lcast.UnderlyingType : rcast.UnderlyingType));
2433 }
2434
2435 static void CreatePointerOperatorsTable ()
2436 {
2437 var temp = new List<PredefinedPointerOperator> ();
2438
2439 //
2440 // Pointer arithmetic:
2441 //
2442 // T* operator + (T* x, int y); T* operator - (T* x, int y);
2443 // T* operator + (T* x, uint y); T* operator - (T* x, uint y);
2444 // T* operator + (T* x, long y); T* operator - (T* x, long y);
2445 // T* operator + (T* x, ulong y); T* operator - (T* x, ulong y);
2446 //
2447 temp.Add (new PredefinedPointerOperator (null, TypeManager.int32_type, Operator.AdditionMask | Operator.SubtractionMask));
2448 temp.Add (new PredefinedPointerOperator (null, TypeManager.uint32_type, Operator.AdditionMask | Operator.SubtractionMask));
2449 temp.Add (new PredefinedPointerOperator (null, TypeManager.int64_type, Operator.AdditionMask | Operator.SubtractionMask));
2450 temp.Add (new PredefinedPointerOperator (null, TypeManager.uint64_type, Operator.AdditionMask | Operator.SubtractionMask));
2451
2452 //
2453 // T* operator + (int y, T* x);
2454 // T* operator + (uint y, T *x);
2455 // T* operator + (long y, T *x);
2456 // T* operator + (ulong y, T *x);
2457 //
2458 temp.Add (new PredefinedPointerOperator (TypeManager.int32_type, null, Operator.AdditionMask, null));
2459 temp.Add (new PredefinedPointerOperator (TypeManager.uint32_type, null, Operator.AdditionMask, null));
2460 temp.Add (new PredefinedPointerOperator (TypeManager.int64_type, null, Operator.AdditionMask, null));
2461 temp.Add (new PredefinedPointerOperator (TypeManager.uint64_type, null, Operator.AdditionMask, null));
2462
2463 //
2464 // long operator - (T* x, T *y)
2465 //
2466 temp.Add (new PredefinedPointerOperator (null, Operator.SubtractionMask, TypeManager.int64_type));
2467
2468 pointer_operators = temp.ToArray ();
2469 }
2470
2471 static void CreateStandardOperatorsTable ()
2472 {
2473 var temp = new List<PredefinedOperator> ();
2474 TypeSpec bool_type = TypeManager.bool_type;
2475
2476 temp.Add (new PredefinedOperator (TypeManager.int32_type, Operator.ArithmeticMask | Operator.BitwiseMask));
2477 temp.Add (new PredefinedOperator (TypeManager.uint32_type, Operator.ArithmeticMask | Operator.BitwiseMask));
2478 temp.Add (new PredefinedOperator (TypeManager.int64_type, Operator.ArithmeticMask | Operator.BitwiseMask));
2479 temp.Add (new PredefinedOperator (TypeManager.uint64_type, Operator.ArithmeticMask | Operator.BitwiseMask));
2480 temp.Add (new PredefinedOperator (TypeManager.float_type, Operator.ArithmeticMask));
2481 temp.Add (new PredefinedOperator (TypeManager.double_type, Operator.ArithmeticMask));
2482 temp.Add (new PredefinedOperator (TypeManager.decimal_type, Operator.ArithmeticMask));
2483
2484 temp.Add (new PredefinedOperator (TypeManager.int32_type, Operator.ComparisonMask, bool_type));
2485 temp.Add (new PredefinedOperator (TypeManager.uint32_type, Operator.ComparisonMask, bool_type));
2486 temp.Add (new PredefinedOperator (TypeManager.int64_type, Operator.ComparisonMask, bool_type));
2487 temp.Add (new PredefinedOperator (TypeManager.uint64_type, Operator.ComparisonMask, bool_type));
2488 temp.Add (new PredefinedOperator (TypeManager.float_type, Operator.ComparisonMask, bool_type));
2489 temp.Add (new PredefinedOperator (TypeManager.double_type, Operator.ComparisonMask, bool_type));
2490 temp.Add (new PredefinedOperator (TypeManager.decimal_type, Operator.ComparisonMask, bool_type));
2491
2492 temp.Add (new PredefinedOperator (TypeManager.string_type, Operator.EqualityMask, bool_type));
2493
2494 temp.Add (new PredefinedStringOperator (TypeManager.string_type, Operator.AdditionMask));
2495 temp.Add (new PredefinedStringOperator (TypeManager.string_type, TypeManager.object_type, Operator.AdditionMask));
2496 temp.Add (new PredefinedStringOperator (TypeManager.object_type, TypeManager.string_type, Operator.AdditionMask));
2497
2498 temp.Add (new PredefinedOperator (bool_type,
2499 Operator.BitwiseMask | Operator.LogicalMask | Operator.EqualityMask, bool_type));
2500
2501 temp.Add (new PredefinedShiftOperator (TypeManager.int32_type, Operator.ShiftMask));
2502 temp.Add (new PredefinedShiftOperator (TypeManager.uint32_type, Operator.ShiftMask));
2503 temp.Add (new PredefinedShiftOperator (TypeManager.int64_type, Operator.ShiftMask));
2504 temp.Add (new PredefinedShiftOperator (TypeManager.uint64_type, Operator.ShiftMask));
2505
2506 standard_operators = temp.ToArray ();
2507 }
2508
2509 //
2510 // Rules used during binary numeric promotion
2511 //
2512 static bool DoNumericPromotion (ResolveContext rc, ref Expression prim_expr, ref Expression second_expr, TypeSpec type)
2513 {
2514 Expression temp;
2515 TypeSpec etype;
2516
2517 Constant c = prim_expr as Constant;
2518 if (c != null) {
2519 temp = c.ConvertImplicitly (rc, type);
2520 if (temp != null) {
2521 prim_expr = temp;
2522 return true;
2523 }
2524 }
2525
2526 if (type == TypeManager.uint32_type) {
2527 etype = prim_expr.Type;
2528 if (etype == TypeManager.int32_type || etype == TypeManager.short_type || etype == TypeManager.sbyte_type) {
2529 type = TypeManager.int64_type;
2530
2531 if (type != second_expr.Type) {
2532 c = second_expr as Constant;
2533 if (c != null)
2534 temp = c.ConvertImplicitly (rc, type);
2535 else
2536 temp = Convert.ImplicitNumericConversion (second_expr, type);
2537 if (temp == null)
2538 return false;
2539 second_expr = temp;
2540 }
2541 }
2542 } else if (type == TypeManager.uint64_type) {
2543 //
2544 // A compile-time error occurs if the other operand is of type sbyte, short, int, or long
2545 //
2546 if (type == TypeManager.int32_type || type == TypeManager.int64_type ||
2547 type == TypeManager.short_type || type == TypeManager.sbyte_type)
2548 return false;
2549 }
2550
2551 temp = Convert.ImplicitNumericConversion (prim_expr, type);
2552 if (temp == null)
2553 return false;
2554
2555 prim_expr = temp;
2556 return true;
2557 }
2558
2559 //
2560 // 7.2.6.2 Binary numeric promotions
2561 //
2562 public bool DoBinaryOperatorPromotion (ResolveContext ec)
2563 {
2564 TypeSpec ltype = left.Type;
2565 TypeSpec rtype = right.Type;
2566 Expression temp;
2567
2568 foreach (TypeSpec t in ConstantFold.BinaryPromotionsTypes) {
2569 if (t == ltype)
2570 return t == rtype || DoNumericPromotion (ec, ref right, ref left, t);
2571
2572 if (t == rtype)
2573 return t == ltype || DoNumericPromotion (ec, ref left, ref right, t);
2574 }
2575
2576 TypeSpec int32 = TypeManager.int32_type;
2577 if (ltype != int32) {
2578 Constant c = left as Constant;
2579 if (c != null)
2580 temp = c.ConvertImplicitly (ec, int32);
2581 else
2582 temp = Convert.ImplicitNumericConversion (left, int32);
2583
2584 if (temp == null)
2585 return false;
2586 left = temp;
2587 }
2588
2589 if (rtype != int32) {
2590 Constant c = right as Constant;
2591 if (c != null)
2592 temp = c.ConvertImplicitly (ec, int32);
2593 else
2594 temp = Convert.ImplicitNumericConversion (right, int32);
2595
2596 if (temp == null)
2597 return false;
2598 right = temp;
2599 }
2600
2601 return true;
2602 }
2603
2604 protected override Expression DoResolve (ResolveContext ec)
2605 {
2606 if (left == null)
2607 return null;
2608
2609 if ((oper == Operator.Subtraction) && (left is ParenthesizedExpression)) {
2610 left = ((ParenthesizedExpression) left).Expr;
2611 left = left.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.Type);
2612 if (left == null)
2613 return null;
2614
2615 if (left.eclass == ExprClass.Type) {
2616 ec.Report.Error (75, loc, "To cast a negative value, you must enclose the value in parentheses");
2617 return null;
2618 }
2619 } else
2620 left = left.Resolve (ec);
2621
2622 if (left == null)
2623 return null;
2624
2625 Constant lc = left as Constant;
2626
2627 if (lc != null && lc.Type == TypeManager.bool_type &&
2628 ((oper == Operator.LogicalAnd && lc.IsDefaultValue) ||
2629 (oper == Operator.LogicalOr && !lc.IsDefaultValue))) {
2630
2631 // FIXME: resolve right expression as unreachable
2632 // right.Resolve (ec);
2633
2634 ec.Report.Warning (429, 4, loc, "Unreachable expression code detected");
2635 return left;
2636 }
2637
2638 right = right.Resolve (ec);
2639 if (right == null)
2640 return null;
2641
2642 eclass = ExprClass.Value;
2643 Constant rc = right as Constant;
2644
2645 // The conversion rules are ignored in enum context but why
2646 if (!ec.HasSet (ResolveContext.Options.EnumScope) && lc != null && rc != null && (TypeManager.IsEnumType (left.Type) || TypeManager.IsEnumType (right.Type))) {
2647 lc = EnumLiftUp (ec, lc, rc, loc);
2648 if (lc != null)
2649 rc = EnumLiftUp (ec, rc, lc, loc);
2650 }
2651
2652 if (rc != null && lc != null) {
2653 int prev_e = ec.Report.Errors;
2654 Expression e = ConstantFold.BinaryFold (ec, oper, lc, rc, loc);
2655 if (e != null)
2656 e = e.Resolve (ec);
2657
2658 if (e != null || ec.Report.Errors != prev_e)
2659 return e;
2660 }
2661
2662 // Comparison warnings
2663 if ((oper & Operator.ComparisonMask) != 0) {
2664 if (left.Equals (right)) {
2665 ec.Report.Warning (1718, 3, loc, "A comparison made to same variable. Did you mean to compare something else?");
2666 }
2667 CheckUselessComparison (ec, lc, right.Type);
2668 CheckUselessComparison (ec, rc, left.Type);
2669 }
2670
2671 if (left.Type == InternalType.Dynamic || right.Type == InternalType.Dynamic) {
2672 Arguments args = new Arguments (2);
2673 args.Add (new Argument (left));
2674 args.Add (new Argument (right));
2675 return new DynamicExpressionStatement (this, args, loc).Resolve (ec);
2676 }
2677
2678 if (RootContext.Version >= LanguageVersion.ISO_2 &&
2679 ((TypeManager.IsNullableType (left.Type) && (right is NullLiteral || TypeManager.IsNullableType (right.Type) || TypeManager.IsValueType (right.Type))) ||
2680 (TypeManager.IsValueType (left.Type) && right is NullLiteral) ||
2681 (TypeManager.IsNullableType (right.Type) && (left is NullLiteral || TypeManager.IsNullableType (left.Type) || TypeManager.IsValueType (left.Type))) ||
2682 (TypeManager.IsValueType (right.Type) && left is NullLiteral)))
2683 return new Nullable.LiftedBinaryOperator (oper, left, right, loc).Resolve (ec);
2684
2685 return DoResolveCore (ec, left, right);
2686 }
2687
2688 protected Expression DoResolveCore (ResolveContext ec, Expression left_orig, Expression right_orig)
2689 {
2690 Expression expr = ResolveOperator (ec);
2691 if (expr == null)
2692 Error_OperatorCannotBeApplied (ec, left_orig, right_orig);
2693
2694 if (left == null || right == null)
2695 throw new InternalErrorException ("Invalid conversion");
2696
2697 if (oper == Operator.BitwiseOr)
2698 CheckBitwiseOrOnSignExtended (ec);
2699
2700 return expr;
2701 }
2702
2703 public override SLE.Expression MakeExpression (BuilderContext ctx)
2704 {
2705 var le = left.MakeExpression (ctx);
2706 var re = right.MakeExpression (ctx);
2707 bool is_checked = ctx.HasSet (BuilderContext.Options.CheckedScope);
2708
2709 switch (oper) {
2710 case Operator.Addition:
2711 return is_checked ? SLE.Expression.AddChecked (le, re) : SLE.Expression.Add (le, re);
2712 case Operator.BitwiseAnd:
2713 return SLE.Expression.And (le, re);
2714 case Operator.BitwiseOr:
2715 return SLE.Expression.Or (le, re);
2716 case Operator.Division:
2717 return SLE.Expression.Divide (le, re);
2718 case Operator.Equality:
2719 return SLE.Expression.Equal (le, re);
2720 case Operator.ExclusiveOr:
2721 return SLE.Expression.ExclusiveOr (le, re);
2722 case Operator.GreaterThan:
2723 return SLE.Expression.GreaterThan (le, re);
2724 case Operator.GreaterThanOrEqual:
2725 return SLE.Expression.GreaterThanOrEqual (le, re);
2726 case Operator.Inequality:
2727 return SLE.Expression.NotEqual (le, re);
2728 case Operator.LeftShift:
2729 return SLE.Expression.LeftShift (le, re);
2730 case Operator.LessThan:
2731 return SLE.Expression.LessThan (le, re);
2732 case Operator.LessThanOrEqual:
2733 return SLE.Expression.LessThanOrEqual (le, re);
2734 case Operator.LogicalAnd:
2735 return SLE.Expression.AndAlso (le, re);
2736 case Operator.LogicalOr:
2737 return SLE.Expression.OrElse (le, re);
2738 case Operator.Modulus:
2739 return SLE.Expression.Modulo (le, re);
2740 case Operator.Multiply:
2741 return is_checked ? SLE.Expression.MultiplyChecked (le, re) : SLE.Expression.Multiply (le, re);
2742 case Operator.RightShift:
2743 return SLE.Expression.RightShift (le, re);
2744 case Operator.Subtraction:
2745 return is_checked ? SLE.Expression.SubtractChecked (le, re) : SLE.Expression.Subtract (le, re);
2746 default:
2747 throw new NotImplementedException (oper.ToString ());
2748 }
2749 }
2750
2751 //
2752 // D operator + (D x, D y)
2753 // D operator - (D x, D y)
2754 // bool operator == (D x, D y)
2755 // bool operator != (D x, D y)
2756 //
2757 Expression ResolveOperatorDelegate (ResolveContext ec, TypeSpec l, TypeSpec r)
2758 {
2759 bool is_equality = (oper & Operator.EqualityMask) != 0;
2760 if (!TypeManager.IsEqual (l, r) && !TypeSpecComparer.Variant.IsEqual (r, l)) {
2761 Expression tmp;
2762 if (right.eclass == ExprClass.MethodGroup || (r == InternalType.AnonymousMethod && !is_equality)) {
2763 tmp = Convert.ImplicitConversionRequired (ec, right, l, loc);
2764 if (tmp == null)
2765 return null;
2766 right = tmp;
2767 r = right.Type;
2768 } else if (left.eclass == ExprClass.MethodGroup || (l == InternalType.AnonymousMethod && !is_equality)) {
2769 tmp = Convert.ImplicitConversionRequired (ec, left, r, loc);
2770 if (tmp == null)
2771 return null;
2772 left = tmp;
2773 l = left.Type;
2774 } else {
2775 return null;
2776 }
2777 }
2778
2779 //
2780 // Resolve delegate equality as a user operator
2781 //
2782 if (is_equality)
2783 return ResolveUserOperator (ec, l, r);
2784
2785 MethodSpec method;
2786 Arguments args = new Arguments (2);
2787 args.Add (new Argument (left));
2788 args.Add (new Argument (right));
2789
2790 if (oper == Operator.Addition) {
2791 if (TypeManager.delegate_combine_delegate_delegate == null) {
2792 TypeManager.delegate_combine_delegate_delegate = TypeManager.GetPredefinedMethod (
2793 TypeManager.delegate_type, "Combine", loc, TypeManager.delegate_type, TypeManager.delegate_type);
2794 }
2795
2796 method = TypeManager.delegate_combine_delegate_delegate;
2797 } else {
2798 if (TypeManager.delegate_remove_delegate_delegate == null) {
2799 TypeManager.delegate_remove_delegate_delegate = TypeManager.GetPredefinedMethod (
2800 TypeManager.delegate_type, "Remove", loc, TypeManager.delegate_type, TypeManager.delegate_type);
2801 }
2802
2803 method = TypeManager.delegate_remove_delegate_delegate;
2804 }
2805
2806 if (method == null)
2807 return new EmptyExpression (TypeManager.decimal_type);
2808
2809 MethodGroupExpr mg = new MethodGroupExpr (method, TypeManager.delegate_type, loc);
2810 mg = mg.OverloadResolve (ec, ref args, false, loc);
2811
2812 return new ClassCast (new UserOperatorCall (mg, args, CreateExpressionTree, loc), l);
2813 }
2814
2815 //
2816 // Enumeration operators
2817 //
2818 Expression ResolveOperatorEnum (ResolveContext ec, bool lenum, bool renum, TypeSpec ltype, TypeSpec rtype)
2819 {
2820 //
2821 // bool operator == (E x, E y);
2822 // bool operator != (E x, E y);
2823 // bool operator < (E x, E y);
2824 // bool operator > (E x, E y);
2825 // bool operator <= (E x, E y);
2826 // bool operator >= (E x, E y);
2827 //
2828 // E operator & (E x, E y);
2829 // E operator | (E x, E y);
2830 // E operator ^ (E x, E y);
2831 //
2832 // U operator - (E e, E f)
2833 // E operator - (E e, U x)
2834 //
2835 // E operator + (U x, E e)
2836 // E operator + (E e, U x)
2837 //
2838 if (!((oper & (Operator.ComparisonMask | Operator.BitwiseMask)) != 0 ||
2839 (oper == Operator.Subtraction && lenum) ||
2840 (oper == Operator.Addition && (lenum != renum || type != null)))) // type != null for lifted null
2841 return null;
2842
2843 Expression ltemp = left;
2844 Expression rtemp = right;
2845 TypeSpec underlying_type;
2846 Expression expr;
2847
2848 if ((oper & (Operator.ComparisonMask | Operator.BitwiseMask)) != 0) {
2849 if (renum) {
2850 expr = Convert.ImplicitConversion (ec, left, rtype, loc);
2851 if (expr != null) {
2852 left = expr;
2853 ltype = expr.Type;
2854 }
2855 } else if (lenum) {
2856 expr = Convert.ImplicitConversion (ec, right, ltype, loc);
2857 if (expr != null) {
2858 right = expr;
2859 rtype = expr.Type;
2860 }
2861 }
2862 }
2863
2864 if (TypeManager.IsEqual (ltype, rtype)) {
2865 underlying_type = EnumSpec.GetUnderlyingType (ltype);
2866
2867 if (left is Constant)
2868 left = ((Constant) left).ConvertExplicitly (false, underlying_type).Resolve (ec);
2869 else
2870 left = EmptyCast.Create (left, underlying_type);
2871
2872 if (right is Constant)
2873 right = ((Constant) right).ConvertExplicitly (false, underlying_type).Resolve (ec);
2874 else
2875 right = EmptyCast.Create (right, underlying_type);
2876 } else if (lenum) {
2877 underlying_type = EnumSpec.GetUnderlyingType (ltype);
2878
2879 if (oper != Operator.Subtraction && oper != Operator.Addition) {
2880 Constant c = right as Constant;
2881 if (c == null || !c.IsDefaultValue)
2882 return null;
2883 } else {
2884 if (!Convert.ImplicitStandardConversionExists (right, underlying_type))
2885 return null;
2886
2887 right = Convert.ImplicitConversionStandard (ec, right, underlying_type, right.Location);
2888 }
2889
2890 if (left is Constant)
2891 left = ((Constant) left).ConvertExplicitly (false, underlying_type).Resolve (ec);
2892 else
2893 left = EmptyCast.Create (left, underlying_type);
2894
2895 } else if (renum) {
2896 underlying_type = EnumSpec.GetUnderlyingType (rtype);
2897
2898 if (oper != Operator.Addition) {
2899 Constant c = left as Constant;
2900 if (c == null || !c.IsDefaultValue)
2901 return null;
2902 } else {
2903 if (!Convert.ImplicitStandardConversionExists (left, underlying_type))
2904 return null;
2905
2906 left = Convert.ImplicitConversionStandard (ec, left, underlying_type, left.Location);
2907 }
2908
2909 if (right is Constant)
2910 right = ((Constant) right).ConvertExplicitly (false, underlying_type).Resolve (ec);
2911 else
2912 right = EmptyCast.Create (right, underlying_type);
2913
2914 } else {
2915 return null;
2916 }
2917
2918 //
2919 // C# specification uses explicit cast syntax which means binary promotion
2920 // should happen, however it seems that csc does not do that
2921 //
2922 if (!DoBinaryOperatorPromotion (ec)) {
2923 left = ltemp;
2924 right = rtemp;
2925 return null;
2926 }
2927
2928 TypeSpec res_type = null;
2929 if ((oper & Operator.BitwiseMask) != 0 || oper == Operator.Subtraction || oper == Operator.Addition) {
2930 TypeSpec promoted_type = lenum ? left.Type : right.Type;
2931 enum_conversion = Convert.ExplicitNumericConversion (
2932 new EmptyExpression (promoted_type), underlying_type);
2933
2934 if (oper == Operator.Subtraction && renum && lenum)
2935 res_type = underlying_type;
2936 else if (oper == Operator.Addition && renum)
2937 res_type = rtype;
2938 else
2939 res_type = ltype;
2940 }
2941
2942 expr = ResolveOperatorPredefined (ec, standard_operators, true, res_type);
2943 if (!is_compound || expr == null)
2944 return expr;
2945
2946 //
2947 // Section: 7.16.2
2948 //
2949
2950 //
2951 // If the return type of the selected operator is implicitly convertible to the type of x
2952 //
2953 if (Convert.ImplicitConversionExists (ec, expr, ltype))
2954 return expr;
2955
2956 //
2957 // Otherwise, if the selected operator is a predefined operator, if the return type of the
2958 // selected operator is explicitly convertible to the type of x, and if y is implicitly
2959 // convertible to the type of x or the operator is a shift operator, then the operation
2960 // is evaluated as x = (T)(x op y), where T is the type of x
2961 //
2962 expr = Convert.ExplicitConversion (ec, expr, ltype, loc);
2963 if (expr == null)
2964 return null;
2965
2966 if (Convert.ImplicitConversionExists (ec, ltemp, ltype))
2967 return expr;
2968
2969 return null;
2970 }
2971
2972 //
2973 // 7.9.6 Reference type equality operators
2974 //
2975 Binary ResolveOperatorEqualityRerefence (ResolveContext ec, TypeSpec l, TypeSpec r)
2976 {
2977 //
2978 // operator != (object a, object b)
2979 // operator == (object a, object b)
2980 //
2981
2982 // TODO: this method is almost equivalent to Convert.ImplicitReferenceConversion
2983
2984 if (left.eclass == ExprClass.MethodGroup || right.eclass == ExprClass.MethodGroup)
2985 return null;
2986
2987 type = TypeManager.bool_type;
2988
2989 var lgen = l as TypeParameterSpec;
2990
2991 if (l == r) {
2992 if (l is InternalType)
2993 return null;
2994
2995 if (lgen != null) {
2996 //
2997 // Only allow to compare same reference type parameter
2998 //
2999 if (TypeManager.IsReferenceType (l)) {
3000 left = new BoxedCast (left, TypeManager.object_type);
3001 right = new BoxedCast (right, TypeManager.object_type);
3002 return this;
3003 }
3004
3005 return null;
3006 }
3007
3008 if (TypeManager.IsValueType (l))
3009 return null;
3010
3011 return this;
3012 }
3013
3014 var rgen = r as TypeParameterSpec;
3015
3016 //
3017 // a, Both operands are reference-type values or the value null
3018 // b, One operand is a value of type T where T is a type-parameter and
3019 // the other operand is the value null. Furthermore T does not have the
3020 // value type constrain
3021 //
3022 if (left is NullLiteral || right is NullLiteral) {
3023 if (lgen != null) {
3024 if (lgen.HasSpecialStruct)
3025 return null;
3026
3027 left = new BoxedCast (left, TypeManager.object_type);
3028 return this;
3029 }
3030
3031 if (rgen != null) {
3032 if (rgen.HasSpecialStruct)
3033 return null;
3034
3035 right = new BoxedCast (right, TypeManager.object_type);
3036 return this;
3037 }
3038 }
3039
3040 //
3041 // An interface is converted to the object before the
3042 // standard conversion is applied. It's not clear from the
3043 // standard but it looks like it works like that.
3044 //
3045 if (lgen != null) {
3046 if (!TypeManager.IsReferenceType (l))
3047 return null;
3048
3049 l = TypeManager.object_type;
3050 left = new BoxedCast (left, l);
3051 } else if (l.IsInterface) {
3052 l = TypeManager.object_type;
3053 } else if (TypeManager.IsStruct (l)) {
3054 return null;
3055 }
3056
3057 if (rgen != null) {
3058 if (!TypeManager.IsReferenceType (r))
3059 return null;
3060
3061 r = TypeManager.object_type;
3062 right = new BoxedCast (right, r);
3063 } else if (r.IsInterface) {
3064 r = TypeManager.object_type;
3065 } else if (TypeManager.IsStruct (r)) {
3066 return null;
3067 }
3068
3069
3070 const string ref_comparison = "Possible unintended reference comparison. " +
3071 "Consider casting the {0} side of the expression to `string' to compare the values";
3072
3073 //
3074 // A standard implicit conversion exists from the type of either
3075 // operand to the type of the other operand
3076 //
3077 if (Convert.ImplicitReferenceConversionExists (left, r)) {
3078 if (l == TypeManager.string_type)
3079 ec.Report.Warning (253, 2, loc, ref_comparison, "right");
3080
3081 return this;
3082 }
3083
3084 if (Convert.ImplicitReferenceConversionExists (right, l)) {
3085 if (r == TypeManager.string_type)
3086 ec.Report.Warning (252, 2, loc, ref_comparison, "left");
3087
3088 return this;
3089 }
3090
3091 return null;
3092 }
3093
3094
3095 Expression ResolveOperatorPointer (ResolveContext ec, TypeSpec l, TypeSpec r)
3096 {
3097 //
3098 // bool operator == (void* x, void* y);
3099 // bool operator != (void* x, void* y);
3100 // bool operator < (void* x, void* y);
3101 // bool operator > (void* x, void* y);
3102 // bool operator <= (void* x, void* y);
3103 // bool operator >= (void* x, void* y);
3104 //
3105 if ((oper & Operator.ComparisonMask) != 0) {
3106 Expression temp;
3107 if (!l.IsPointer) {
3108 temp = Convert.ImplicitConversion (ec, left, r, left.Location);
3109 if (temp == null)
3110 return null;
3111 left = temp;
3112 }
3113
3114 if (!r.IsPointer) {
3115 temp = Convert.ImplicitConversion (ec, right, l, right.Location);
3116 if (temp == null)
3117 return null;
3118 right = temp;
3119 }
3120
3121 type = TypeManager.bool_type;
3122 return this;
3123 }
3124
3125 if (pointer_operators == null)
3126 CreatePointerOperatorsTable ();
3127
3128 return ResolveOperatorPredefined (ec, pointer_operators, false, null);
3129 }
3130
3131 //
3132 // Build-in operators method overloading
3133 //
3134 protected virtual Expression ResolveOperatorPredefined (ResolveContext ec, PredefinedOperator [] operators, bool primitives_only, TypeSpec enum_type)
3135 {
3136 PredefinedOperator best_operator = null;
3137 TypeSpec l = left.Type;
3138 TypeSpec r = right.Type;
3139 Operator oper_mask = oper & ~Operator.ValuesOnlyMask;
3140
3141 foreach (PredefinedOperator po in operators) {
3142 if ((po.OperatorsMask & oper_mask) == 0)
3143 continue;
3144
3145 if (primitives_only) {
3146 if (!po.IsPrimitiveApplicable (l, r))
3147 continue;
3148 } else {
3149 if (!po.IsApplicable (ec, left, right))
3150 continue;
3151 }
3152
3153 if (best_operator == null) {
3154 best_operator = po;
3155 if (primitives_only)
3156 break;
3157
3158 continue;
3159 }
3160
3161 best_operator = po.ResolveBetterOperator (ec, best_operator);
3162
3163 if (best_operator == null) {
3164 ec.Report.Error (34, loc, "Operator `{0}' is ambiguous on operands of type `{1}' and `{2}'",
3165 OperName (oper), TypeManager.CSharpName (l), TypeManager.CSharpName (r));
3166
3167 best_operator = po;
3168 break;
3169 }
3170 }
3171
3172 if (best_operator == null)
3173 return null;
3174
3175 Expression expr = best_operator.ConvertResult (ec, this);
3176
3177 //
3178 // Optimize &/&& constant expressions with 0 value
3179 //
3180 if (oper == Operator.BitwiseAnd || oper == Operator.LogicalAnd) {
3181 Constant rc = right as Constant;
3182 Constant lc = left as Constant;
3183 if ((lc != null && lc.IsDefaultValue) || (rc != null && rc.IsDefaultValue)) {
3184 //
3185 // The result is a constant with side-effect
3186 //
3187 Constant side_effect = rc == null ?
3188 new SideEffectConstant (lc, right, loc) :
3189 new SideEffectConstant (rc, left, loc);
3190
3191 return ReducedExpression.Create (side_effect.Resolve (ec), expr);
3192 }
3193 }
3194
3195 if (enum_type == null)
3196 return expr;
3197
3198 //
3199 // HACK: required by enum_conversion
3200 //
3201 expr.Type = enum_type;
3202 return EmptyCast.Create (expr, enum_type);
3203 }
3204
3205 //
3206 // Performs user-operator overloading
3207 //
3208 protected virtual Expression ResolveUserOperator (ResolveContext ec, TypeSpec l, TypeSpec r)
3209 {
3210 Operator user_oper;
3211 if (oper == Operator.LogicalAnd)
3212 user_oper = Operator.BitwiseAnd;
3213 else if (oper == Operator.LogicalOr)
3214 user_oper = Operator.BitwiseOr;
3215 else
3216 user_oper = oper;
3217
3218 string op = GetOperatorMetadataName (user_oper);
3219
3220 MethodGroupExpr left_operators = MethodLookup (ec.Compiler, ec.CurrentType, l, MemberKind.Operator, op, 0, loc);
3221 MethodGroupExpr right_operators = null;
3222
3223 if (!TypeManager.IsEqual (r, l)) {
3224 right_operators = MethodLookup (ec.Compiler, ec.CurrentType, r, MemberKind.Operator, op, 0, loc);
3225 if (right_operators == null && left_operators == null)
3226 return null;
3227 } else if (left_operators == null) {
3228 return null;
3229 }
3230
3231 Arguments args = new Arguments (2);
3232 Argument larg = new Argument (left);
3233 args.Add (larg);
3234 Argument rarg = new Argument (right);
3235 args.Add (rarg);
3236
3237 MethodGroupExpr union;
3238
3239 //
3240 // User-defined operator implementations always take precedence
3241 // over predefined operator implementations
3242 //
3243 if (left_operators != null && right_operators != null) {
3244 if (IsPredefinedUserOperator (l, user_oper)) {
3245 union = right_operators.OverloadResolve (ec, ref args, true, loc);
3246 if (union == null)
3247 union = left_operators;
3248 } else if (IsPredefinedUserOperator (r, user_oper)) {
3249 union = left_operators.OverloadResolve (ec, ref args, true, loc);
3250 if (union == null)
3251 union = right_operators;
3252 } else {
3253 union = MethodGroupExpr.MakeUnionSet (left_operators, right_operators, loc);
3254 }
3255 } else if (left_operators != null) {
3256 union = left_operators;
3257 } else {
3258 union = right_operators;
3259 }
3260
3261 union = union.OverloadResolve (ec, ref args, true, loc);
3262 if (union == null)
3263 return null;
3264
3265 Expression oper_expr;
3266
3267 // TODO: CreateExpressionTree is allocated every time
3268 if (user_oper != oper) {
3269 oper_expr = new ConditionalLogicalOperator (union, args, CreateExpressionTree,
3270 oper == Operator.LogicalAnd, loc).Resolve (ec);
3271 } else {
3272 oper_expr = new UserOperatorCall (union, args, CreateExpressionTree, loc);
3273
3274 //
3275 // This is used to check if a test 'x == null' can be optimized to a reference equals,
3276 // and not invoke user operator
3277 //
3278 if ((oper & Operator.EqualityMask) != 0) {
3279 if ((left is NullLiteral && IsBuildInEqualityOperator (r)) ||
3280 (right is NullLiteral && IsBuildInEqualityOperator (l))) {
3281 type = TypeManager.bool_type;
3282 if (left is NullLiteral || right is NullLiteral)
3283 oper_expr = ReducedExpression.Create (this, oper_expr);
3284 } else if (l != r) {
3285 var mi = union.BestCandidate;
3286
3287 //
3288 // Two System.Delegate(s) are never equal
3289 //
3290 if (mi.DeclaringType == TypeManager.multicast_delegate_type)
3291 return null;
3292 }
3293 }
3294 }
3295
3296 left = larg.Expr;
3297 right = rarg.Expr;
3298 return oper_expr;
3299 }
3300
3301 public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
3302 {
3303 return null;
3304 }
3305
3306 private void CheckUselessComparison (ResolveContext ec, Constant c, TypeSpec type)
3307 {
3308 if (c == null || !IsTypeIntegral (type)
3309 || c is StringConstant
3310 || c is BoolConstant
3311 || c is FloatConstant
3312 || c is DoubleConstant
3313 || c is DecimalConstant
3314 )
3315 return;
3316
3317 long value = 0;
3318
3319 if (c is ULongConstant) {
3320 ulong uvalue = ((ULongConstant) c).Value;
3321 if (uvalue > long.MaxValue) {
3322 if (type == TypeManager.byte_type ||
3323 type == TypeManager.sbyte_type ||
3324 type == TypeManager.short_type ||
3325 type == TypeManager.ushort_type ||
3326 type == TypeManager.int32_type ||
3327 type == TypeManager.uint32_type ||
3328 type == TypeManager.int64_type ||
3329 type == TypeManager.char_type)
3330 WarnUselessComparison (ec, type);
3331 return;
3332 }
3333 value = (long) uvalue;
3334 }
3335 else if (c is ByteConstant)
3336 value = ((ByteConstant) c).Value;
3337 else if (c is SByteConstant)
3338 value = ((SByteConstant) c).Value;
3339 else if (c is ShortConstant)
3340 value = ((ShortConstant) c).Value;
3341 else if (c is UShortConstant)
3342 value = ((UShortConstant) c).Value;
3343 else if (c is IntConstant)
3344 value = ((IntConstant) c).Value;
3345 else if (c is UIntConstant)
3346 value = ((UIntConstant) c).Value;
3347 else if (c is LongConstant)
3348 value = ((LongConstant) c).Value;
3349 else if (c is CharConstant)
3350 value = ((CharConstant)c).Value;
3351
3352 if (value == 0)
3353 return;
3354
3355 if (IsValueOutOfRange (value, type))
3356 WarnUselessComparison (ec, type);
3357 }
3358
3359 static bool IsValueOutOfRange (long value, TypeSpec type)
3360 {
3361 if (IsTypeUnsigned (type) && value < 0)
3362 return true;
3363 return type == TypeManager.sbyte_type && (value >= 0x80 || value < -0x80) ||
3364 type == TypeManager.byte_type && value >= 0x100 ||
3365 type == TypeManager.short_type && (value >= 0x8000 || value < -0x8000) ||
3366 type == TypeManager.ushort_type && value >= 0x10000 ||
3367 type == TypeManager.int32_type && (value >= 0x80000000 || value < -0x80000000) ||
3368 type == TypeManager.uint32_type && value >= 0x100000000;
3369 }
3370
3371 static bool IsBuildInEqualityOperator (TypeSpec t)
3372 {
3373 return t == TypeManager.object_type || t == TypeManager.string_type ||
3374 t == TypeManager.delegate_type || TypeManager.IsDelegateType (t);
3375 }
3376
3377 static bool IsPredefinedUserOperator (TypeSpec t, Operator op)
3378 {
3379 //
3380 // Some predefined types have user operators
3381 //
3382 return (op & Operator.EqualityMask) != 0 && (t == TypeManager.string_type || t == TypeManager.decimal_type);
3383 }
3384
3385 private static bool IsTypeIntegral (TypeSpec type)
3386 {
3387 return type == TypeManager.uint64_type ||
3388 type == TypeManager.int64_type ||
3389 type == TypeManager.uint32_type ||
3390 type == TypeManager.int32_type ||
3391 type == TypeManager.ushort_type ||
3392 type == TypeManager.short_type ||
3393 type == TypeManager.sbyte_type ||
3394 type == TypeManager.byte_type ||
3395 type == TypeManager.char_type;
3396 }
3397
3398 private static bool IsTypeUnsigned (TypeSpec type)
3399 {
3400 return type == TypeManager.uint64_type ||
3401 type == TypeManager.uint32_type ||
3402 type == TypeManager.ushort_type ||
3403 type == TypeManager.byte_type ||
3404 type == TypeManager.char_type;
3405 }
3406
3407 private void WarnUselessComparison (ResolveContext ec, TypeSpec type)
3408 {
3409 ec.Report.Warning (652, 2, loc, "A comparison between a constant and a variable is useless. The constant is out of the range of the variable type `{0}'",
3410 TypeManager.CSharpName (type));
3411 }
3412
3413 /// <remarks>
3414 /// EmitBranchable is called from Statement.EmitBoolExpression in the
3415 /// context of a conditional bool expression. This function will return
3416 /// false if it is was possible to use EmitBranchable, or true if it was.
3417 ///
3418 /// The expression's code is generated, and we will generate a branch to `target'
3419 /// if the resulting expression value is equal to isTrue
3420 /// </remarks>
3421 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
3422 {
3423 //
3424 // This is more complicated than it looks, but its just to avoid
3425 // duplicated tests: basically, we allow ==, !=, >, <, >= and <=
3426 // but on top of that we want for == and != to use a special path
3427 // if we are comparing against null
3428 //
3429 if ((oper & Operator.EqualityMask) != 0 && (left is Constant || right is Constant)) {
3430 bool my_on_true = oper == Operator.Inequality ? on_true : !on_true;
3431
3432 //
3433 // put the constant on the rhs, for simplicity
3434 //
3435 if (left is Constant) {
3436 Expression swap = right;
3437 right = left;
3438 left = swap;
3439 }
3440
3441 //
3442 // brtrue/brfalse works with native int only
3443 //
3444 if (((Constant) right).IsZeroInteger && right.Type != TypeManager.int64_type && right.Type != TypeManager.uint64_type) {
3445 left.EmitBranchable (ec, target, my_on_true);
3446 return;
3447 }
3448 if (right.Type == TypeManager.bool_type) {
3449 // right is a boolean, and it's not 'false' => it is 'true'
3450 left.EmitBranchable (ec, target, !my_on_true);
3451 return;
3452 }
3453
3454 } else if (oper == Operator.LogicalAnd) {
3455
3456 if (on_true) {
3457 Label tests_end = ec.DefineLabel ();
3458
3459 left.EmitBranchable (ec, tests_end, false);
3460 right.EmitBranchable (ec, target, true);
3461 ec.MarkLabel (tests_end);
3462 } else {
3463 //
3464 // This optimizes code like this
3465 // if (true && i > 4)
3466 //
3467 if (!(left is Constant))
3468 left.EmitBranchable (ec, target, false);
3469
3470 if (!(right is Constant))
3471 right.EmitBranchable (ec, target, false);
3472 }
3473
3474 return;
3475
3476 } else if (oper == Operator.LogicalOr){
3477 if (on_true) {
3478 left.EmitBranchable (ec, target, true);
3479 right.EmitBranchable (ec, target, true);
3480
3481 } else {
3482 Label tests_end = ec.DefineLabel ();
3483 left.EmitBranchable (ec, tests_end, true);
3484 right.EmitBranchable (ec, target, false);
3485 ec.MarkLabel (tests_end);
3486 }
3487
3488 return;
3489
3490 } else if ((oper & Operator.ComparisonMask) == 0) {
3491 base.EmitBranchable (ec, target, on_true);
3492 return;
3493 }
3494
3495 left.Emit (ec);
3496 right.Emit (ec);
3497
3498 TypeSpec t = left.Type;
3499 bool is_float = IsFloat (t);
3500 bool is_unsigned = is_float || IsUnsigned (t);
3501
3502 switch (oper){
3503 case Operator.Equality:
3504 if (on_true)
3505 ec.Emit (OpCodes.Beq, target);
3506 else
3507 ec.Emit (OpCodes.Bne_Un, target);
3508 break;
3509
3510 case Operator.Inequality:
3511 if (on_true)
3512 ec.Emit (OpCodes.Bne_Un, target);
3513 else
3514 ec.Emit (OpCodes.Beq, target);
3515 break;
3516
3517 case Operator.LessThan:
3518 if (on_true)
3519 if (is_unsigned && !is_float)
3520 ec.Emit (OpCodes.Blt_Un, target);
3521 else
3522 ec.Emit (OpCodes.Blt, target);
3523 else
3524 if (is_unsigned)
3525 ec.Emit (OpCodes.Bge_Un, target);
3526 else
3527 ec.Emit (OpCodes.Bge, target);
3528 break;
3529
3530 case Operator.GreaterThan:
3531 if (on_true)
3532 if (is_unsigned && !is_float)
3533 ec.Emit (OpCodes.Bgt_Un, target);
3534 else
3535 ec.Emit (OpCodes.Bgt, target);
3536 else
3537 if (is_unsigned)
3538 ec.Emit (OpCodes.Ble_Un, target);
3539 else
3540 ec.Emit (OpCodes.Ble, target);
3541 break;
3542
3543 case Operator.LessThanOrEqual:
3544 if (on_true)
3545 if (is_unsigned && !is_float)
3546 ec.Emit (OpCodes.Ble_Un, target);
3547 else
3548 ec.Emit (OpCodes.Ble, target);
3549 else
3550 if (is_unsigned)
3551 ec.Emit (OpCodes.Bgt_Un, target);
3552 else
3553 ec.Emit (OpCodes.Bgt, target);
3554 break;
3555
3556
3557 case Operator.GreaterThanOrEqual:
3558 if (on_true)
3559 if (is_unsigned && !is_float)
3560 ec.Emit (OpCodes.Bge_Un, target);
3561 else
3562 ec.Emit (OpCodes.Bge, target);
3563 else
3564 if (is_unsigned)
3565 ec.Emit (OpCodes.Blt_Un, target);
3566 else
3567 ec.Emit (OpCodes.Blt, target);
3568 break;
3569 default:
3570 throw new InternalErrorException (oper.ToString ());
3571 }
3572 }
3573
3574 public override void Emit (EmitContext ec)
3575 {
3576 EmitOperator (ec, left.Type);
3577 }
3578
3579 protected virtual void EmitOperator (EmitContext ec, TypeSpec l)
3580 {
3581 //
3582 // Handle short-circuit operators differently
3583 // than the rest
3584 //
3585 if ((oper & Operator.LogicalMask) != 0) {
3586 Label load_result = ec.DefineLabel ();
3587 Label end = ec.DefineLabel ();
3588
3589 bool is_or = oper == Operator.LogicalOr;
3590 left.EmitBranchable (ec, load_result, is_or);
3591 right.Emit (ec);
3592 ec.Emit (OpCodes.Br_S, end);
3593
3594 ec.MarkLabel (load_result);
3595 ec.Emit (is_or ? OpCodes.Ldc_I4_1 : OpCodes.Ldc_I4_0);
3596 ec.MarkLabel (end);
3597 return;
3598 }
3599
3600 //
3601 // Optimize zero-based operations which cannot be optimized at expression level
3602 //
3603 if (oper == Operator.Subtraction) {
3604 var lc = left as IntegralConstant;
3605 if (lc != null && lc.IsDefaultValue) {
3606 right.Emit (ec);
3607 ec.Emit (OpCodes.Neg);
3608 return;
3609 }
3610 }
3611
3612 left.Emit (ec);
3613 right.Emit (ec);
3614 EmitOperatorOpcode (ec, oper, l);
3615
3616 //
3617 // Nullable enum could require underlying type cast and we cannot simply wrap binary
3618 // expression because that would wrap lifted binary operation
3619 //
3620 if (enum_conversion != null)
3621 enum_conversion.Emit (ec);
3622 }
3623
3624 public override void EmitSideEffect (EmitContext ec)
3625 {
3626 if ((oper & Operator.LogicalMask) != 0 ||
3627 (ec.HasSet (EmitContext.Options.CheckedScope) && (oper == Operator.Multiply || oper == Operator.Addition || oper == Operator.Subtraction))) {
3628 base.EmitSideEffect (ec);
3629 } else {
3630 left.EmitSideEffect (ec);
3631 right.EmitSideEffect (ec);
3632 }
3633 }
3634
3635 protected override void CloneTo (CloneContext clonectx, Expression t)
3636 {
3637 Binary target = (Binary) t;
3638
3639 target.left = left.Clone (clonectx);
3640 target.right = right.Clone (clonectx);
3641 }
3642
3643 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
3644 {
3645 Arguments binder_args = new Arguments (4);
3646
3647 MemberAccess sle = new MemberAccess (new MemberAccess (
3648 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
3649
3650 CSharpBinderFlags flags = 0;
3651 if (ec.HasSet (ResolveContext.Options.CheckedScope))
3652 flags = CSharpBinderFlags.CheckedContext;
3653
3654 if ((oper & Operator.LogicalMask) != 0)
3655 flags |= CSharpBinderFlags.BinaryOperationLogical;
3656
3657 binder_args.Add (new Argument (new EnumConstant (new IntLiteral ((int) flags, loc), TypeManager.binder_flags)));
3658 binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), GetOperatorExpressionTypeName (), loc)));
3659 binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
3660 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (ec), loc)));
3661
3662 return new Invocation (DynamicExpressionStatement.GetBinder ("BinaryOperation", loc), binder_args);
3663 }
3664
3665 public override Expression CreateExpressionTree (ResolveContext ec)
3666 {
3667 return CreateExpressionTree (ec, null);
3668 }
3669
3670 Expression CreateExpressionTree (ResolveContext ec, MethodGroupExpr method)
3671 {
3672 string method_name;
3673 bool lift_arg = false;
3674
3675 switch (oper) {
3676 case Operator.Addition:
3677 if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
3678 method_name = "AddChecked";
3679 else
3680 method_name = "Add";
3681 break;
3682 case Operator.BitwiseAnd:
3683 method_name = "And";
3684 break;
3685 case Operator.BitwiseOr:
3686 method_name = "Or";
3687 break;
3688 case Operator.Division:
3689 method_name = "Divide";
3690 break;
3691 case Operator.Equality:
3692 method_name = "Equal";
3693 lift_arg = true;
3694 break;
3695 case Operator.ExclusiveOr:
3696 method_name = "ExclusiveOr";
3697 break;
3698 case Operator.GreaterThan:
3699 method_name = "GreaterThan";
3700 lift_arg = true;
3701 break;
3702 case Operator.GreaterThanOrEqual:
3703 method_name = "GreaterThanOrEqual";
3704 lift_arg = true;
3705 break;
3706 case Operator.Inequality:
3707 method_name = "NotEqual";
3708 lift_arg = true;
3709 break;
3710 case Operator.LeftShift:
3711 method_name = "LeftShift";
3712 break;
3713 case Operator.LessThan:
3714 method_name = "LessThan";
3715 lift_arg = true;
3716 break;
3717 case Operator.LessThanOrEqual:
3718 method_name = "LessThanOrEqual";
3719 lift_arg = true;
3720 break;
3721 case Operator.LogicalAnd:
3722 method_name = "AndAlso";
3723 break;
3724 case Operator.LogicalOr:
3725 method_name = "OrElse";
3726 break;
3727 case Operator.Modulus:
3728 method_name = "Modulo";
3729 break;
3730 case Operator.Multiply:
3731 if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
3732 method_name = "MultiplyChecked";
3733 else
3734 method_name = "Multiply";
3735 break;
3736 case Operator.RightShift:
3737 method_name = "RightShift";
3738 break;
3739 case Operator.Subtraction:
3740 if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
3741 method_name = "SubtractChecked";
3742 else
3743 method_name = "Subtract";
3744 break;
3745
3746 default:
3747 throw new InternalErrorException ("Unknown expression tree binary operator " + oper);
3748 }
3749
3750 Arguments args = new Arguments (2);
3751 args.Add (new Argument (left.CreateExpressionTree (ec)));
3752 args.Add (new Argument (right.CreateExpressionTree (ec)));
3753 if (method != null) {
3754 if (lift_arg)
3755 args.Add (new Argument (new BoolConstant (false, loc)));
3756
3757 args.Add (new Argument (method.CreateExpressionTree (ec)));
3758 }
3759
3760 return CreateExpressionFactoryCall (ec, method_name, args);
3761 }
3762 }
3763
3764 //
3765 // Represents the operation a + b [+ c [+ d [+ ...]]], where a is a string
3766 // b, c, d... may be strings or objects.
3767 //
3768 public class StringConcat : Expression {
3769 Arguments arguments;
3770
3771 public StringConcat (Expression left, Expression right, Location loc)
3772 {
3773 this.loc = loc;
3774 type = TypeManager.string_type;
3775 eclass = ExprClass.Value;
3776
3777 arguments = new Arguments (2);
3778 }
3779
3780 public static StringConcat Create (ResolveContext rc, Expression left, Expression right, Location loc)
3781 {
3782 if (left.eclass == ExprClass.Unresolved || right.eclass == ExprClass.Unresolved)
3783 throw new ArgumentException ();
3784
3785 var s = new StringConcat (left, right, loc);
3786 s.Append (rc, left);
3787 s.Append (rc, right);
3788 return s;
3789 }
3790
3791 public override Expression CreateExpressionTree (ResolveContext ec)
3792 {
3793 Argument arg = arguments [0];
3794 return CreateExpressionAddCall (ec, arg, arg.CreateExpressionTree (ec), 1);
3795 }
3796
3797 //
3798 // Creates nested calls tree from an array of arguments used for IL emit
3799 //
3800 Expression CreateExpressionAddCall (ResolveContext ec, Argument left, Expression left_etree, int pos)
3801 {
3802 Arguments concat_args = new Arguments (2);
3803 Arguments add_args = new Arguments (3);
3804
3805 concat_args.Add (left);
3806 add_args.Add (new Argument (left_etree));
3807
3808 concat_args.Add (arguments [pos]);
3809 add_args.Add (new Argument (arguments [pos].CreateExpressionTree (ec)));
3810
3811 MethodGroupExpr method = CreateConcatMemberExpression ().Resolve (ec) as MethodGroupExpr;
3812 if (method == null)
3813 return null;
3814
3815 method = method.OverloadResolve (ec, ref concat_args, false, loc);
3816 if (method == null)
3817 return null;
3818
3819 add_args.Add (new Argument (method.CreateExpressionTree (ec)));
3820
3821 Expression expr = CreateExpressionFactoryCall (ec, "Add", add_args);
3822 if (++pos == arguments.Count)
3823 return expr;
3824
3825 left = new Argument (new EmptyExpression (method.BestCandidate.ReturnType));
3826 return CreateExpressionAddCall (ec, left, expr, pos);
3827 }
3828
3829 protected override Expression DoResolve (ResolveContext ec)
3830 {
3831 return this;
3832 }
3833
3834 void Append (ResolveContext rc, Expression operand)
3835 {
3836 //
3837 // Constant folding
3838 //
3839 StringConstant sc = operand as StringConstant;
3840 if (sc != null) {
3841 if (arguments.Count != 0) {
3842 Argument last_argument = arguments [arguments.Count - 1];
3843 StringConstant last_expr_constant = last_argument.Expr as StringConstant;
3844 if (last_expr_constant != null) {
3845 last_argument.Expr = new StringConstant (
3846 last_expr_constant.Value + sc.Value, sc.Location).Resolve (rc);
3847 return;
3848 }
3849 }
3850 } else {
3851 //
3852 // Multiple (3+) concatenation are resolved as multiple StringConcat instances
3853 //
3854 StringConcat concat_oper = operand as StringConcat;
3855 if (concat_oper != null) {
3856 arguments.AddRange (concat_oper.arguments);
3857 return;
3858 }
3859 }
3860
3861 arguments.Add (new Argument (operand));
3862 }
3863
3864 Expression CreateConcatMemberExpression ()
3865 {
3866 return new MemberAccess (new MemberAccess (new QualifiedAliasMember ("global", "System", loc), "String", loc), "Concat", loc);
3867 }
3868
3869 public override void Emit (EmitContext ec)
3870 {
3871 Expression concat = new Invocation (CreateConcatMemberExpression (), arguments, true);
3872 concat = concat.Resolve (new ResolveContext (ec.MemberContext));
3873 if (concat != null)
3874 concat.Emit (ec);
3875 }
3876
3877 public override SLE.Expression MakeExpression (BuilderContext ctx)
3878 {
3879 if (arguments.Count != 2)
3880 throw new NotImplementedException ("arguments.Count != 2");
3881
3882 var concat = typeof (string).GetMethod ("Concat", new[] { typeof (object), typeof (object) });
3883 return SLE.Expression.Add (arguments[0].Expr.MakeExpression (ctx), arguments[1].Expr.MakeExpression (ctx), concat);
3884 }
3885 }
3886
3887 //
3888 // User-defined conditional logical operator
3889 //
3890 public class ConditionalLogicalOperator : UserOperatorCall {
3891 readonly bool is_and;
3892 Expression oper;
3893
3894 public ConditionalLogicalOperator (MethodGroupExpr oper_method, Arguments arguments,
3895 ExpressionTreeExpression expr_tree, bool is_and, Location loc)
3896 : base (oper_method, arguments, expr_tree, loc)
3897 {
3898 this.is_and = is_and;
3899 eclass = ExprClass.Unresolved;
3900 }
3901
3902 protected override Expression DoResolve (ResolveContext ec)
3903 {
3904 var method = mg.BestCandidate;
3905 type = method.ReturnType;
3906 AParametersCollection pd = method.Parameters;
3907 if (!TypeManager.IsEqual (type, type) || !TypeManager.IsEqual (type, pd.Types [0]) || !TypeManager.IsEqual (type, pd.Types [1])) {
3908 ec.Report.Error (217, loc,
3909 "A user-defined operator `{0}' must have parameters and return values of the same type in order to be applicable as a short circuit operator",
3910 TypeManager.CSharpSignature (method));
3911 return null;
3912 }
3913
3914 Expression left_dup = new EmptyExpression (type);
3915 Expression op_true = GetOperatorTrue (ec, left_dup, loc);
3916 Expression op_false = GetOperatorFalse (ec, left_dup, loc);
3917 if (op_true == null || op_false == null) {
3918 ec.Report.Error (218, loc,
3919 "The type `{0}' must have operator `true' and operator `false' defined when `{1}' is used as a short circuit operator",
3920 TypeManager.CSharpName (type), TypeManager.CSharpSignature (method));
3921 return null;
3922 }
3923
3924 oper = is_and ? op_false : op_true;
3925 eclass = ExprClass.Value;
3926 return this;
3927 }
3928
3929 public override void Emit (EmitContext ec)
3930 {
3931 Label end_target = ec.DefineLabel ();
3932
3933 //
3934 // Emit and duplicate left argument
3935 //
3936 arguments [0].Expr.Emit (ec);
3937 ec.Emit (OpCodes.Dup);
3938 arguments.RemoveAt (0);
3939
3940 oper.EmitBranchable (ec, end_target, true);
3941 base.Emit (ec);
3942 ec.MarkLabel (end_target);
3943 }
3944 }
3945
3946 public class PointerArithmetic : Expression {
3947 Expression left, right;
3948 Binary.Operator op;
3949
3950 //
3951 // We assume that `l' is always a pointer
3952 //
3953 public PointerArithmetic (Binary.Operator op, Expression l, Expression r, TypeSpec t, Location loc)
3954 {
3955 type = t;
3956 this.loc = loc;
3957 left = l;
3958 right = r;
3959 this.op = op;
3960 }
3961
3962 public override Expression CreateExpressionTree (ResolveContext ec)
3963 {
3964 Error_PointerInsideExpressionTree (ec);
3965 return null;
3966 }
3967
3968 protected override Expression DoResolve (ResolveContext ec)
3969 {
3970 eclass = ExprClass.Variable;
3971
3972 if (left.Type == TypeManager.void_ptr_type) {
3973 ec.Report.Error (242, loc, "The operation in question is undefined on void pointers");
3974 return null;
3975 }
3976
3977 return this;
3978 }
3979
3980 public override void Emit (EmitContext ec)
3981 {
3982 TypeSpec op_type = left.Type;
3983
3984 // It must be either array or fixed buffer
3985 TypeSpec element;
3986 if (TypeManager.HasElementType (op_type)) {
3987 element = TypeManager.GetElementType (op_type);
3988 } else {
3989 FieldExpr fe = left as FieldExpr;
3990 if (fe != null)
3991 element = ((FixedFieldSpec) (fe.Spec)).ElementType;
3992 else
3993 element = op_type;
3994 }
3995
3996 int size = GetTypeSize (element);
3997 TypeSpec rtype = right.Type;
3998
3999 if ((op & Binary.Operator.SubtractionMask) != 0 && rtype.IsPointer){
4000 //
4001 // handle (pointer - pointer)
4002 //
4003 left.Emit (ec);
4004 right.Emit (ec);
4005 ec.Emit (OpCodes.Sub);
4006
4007 if (size != 1){
4008 if (size == 0)
4009 ec.Emit (OpCodes.Sizeof, element);
4010 else
4011 ec.EmitInt (size);
4012 ec.Emit (OpCodes.Div);
4013 }
4014 ec.Emit (OpCodes.Conv_I8);
4015 } else {
4016 //
4017 // handle + and - on (pointer op int)
4018 //
4019 Constant left_const = left as Constant;
4020 if (left_const != null) {
4021 //
4022 // Optimize ((T*)null) pointer operations
4023 //
4024 if (left_const.IsDefaultValue) {
4025 left = EmptyExpression.Null;
4026 } else {
4027 left_const = null;
4028 }
4029 }
4030
4031 left.Emit (ec);
4032
4033 var right_const = right as Constant;
4034 if (right_const != null) {
4035 //
4036 // Optimize 0-based arithmetic
4037 //
4038 if (right_const.IsDefaultValue)
4039 return;
4040
4041 if (size != 0)
4042 right = new IntConstant (size, right.Location);
4043 else
4044 right = new SizeOf (new TypeExpression (element, right.Location), right.Location);
4045
4046 // TODO: Should be the checks resolve context sensitive?
4047 ResolveContext rc = new ResolveContext (ec.MemberContext, ResolveContext.Options.UnsafeScope);
4048 right = new Binary (Binary.Operator.Multiply, right, right_const, loc).Resolve (rc);
4049 if (right == null)
4050 return;
4051 }
4052
4053 right.Emit (ec);
4054 if (rtype == TypeManager.sbyte_type || rtype == TypeManager.byte_type ||
4055 rtype == TypeManager.short_type || rtype == TypeManager.ushort_type) {
4056 ec.Emit (OpCodes.Conv_I);
4057 } else if (rtype == TypeManager.uint32_type) {
4058 ec.Emit (OpCodes.Conv_U);
4059 }
4060
4061 if (right_const == null && size != 1){
4062 if (size == 0)
4063 ec.Emit (OpCodes.Sizeof, element);
4064 else
4065 ec.EmitInt (size);
4066 if (rtype == TypeManager.int64_type || rtype == TypeManager.uint64_type)
4067 ec.Emit (OpCodes.Conv_I8);
4068
4069 Binary.EmitOperatorOpcode (ec, Binary.Operator.Multiply, rtype);
4070 }
4071
4072 if (left_const == null) {
4073 if (rtype == TypeManager.int64_type)
4074 ec.Emit (OpCodes.Conv_I);
4075 else if (rtype == TypeManager.uint64_type)
4076 ec.Emit (OpCodes.Conv_U);
4077
4078 Binary.EmitOperatorOpcode (ec, op, op_type);
4079 }
4080 }
4081 }
4082 }
4083
4084 //
4085 // A boolean-expression is an expression that yields a result
4086 // of type bool
4087 //
4088 public class BooleanExpression : ShimExpression
4089 {
4090 public BooleanExpression (Expression expr)
4091 : base (expr)
4092 {
4093 this.loc = expr.Location;
4094 }
4095
4096 public override Expression CreateExpressionTree (ResolveContext ec)
4097 {
4098 // TODO: We should emit IsTrue (v4) instead of direct user operator
4099 // call but that would break csc compatibility
4100 return base.CreateExpressionTree (ec);
4101 }
4102
4103 protected override Expression DoResolve (ResolveContext ec)
4104 {
4105 // A boolean-expression is required to be of a type
4106 // that can be implicitly converted to bool or of
4107 // a type that implements operator true
4108
4109 expr = expr.Resolve (ec);
4110 if (expr == null)
4111 return null;
4112
4113 Assign ass = expr as Assign;
4114 if (ass != null && ass.Source is Constant) {
4115 ec.Report.Warning (665, 3, loc,
4116 "Assignment in conditional expression is always constant. Did you mean to use `==' instead ?");
4117 }
4118
4119 if (expr.Type == TypeManager.bool_type)
4120 return expr;
4121
4122 if (expr.Type == InternalType.Dynamic) {
4123 Arguments args = new Arguments (1);
4124 args.Add (new Argument (expr));
4125 return new DynamicUnaryConversion ("IsTrue", args, loc).Resolve (ec);
4126 }
4127
4128 type = TypeManager.bool_type;
4129 Expression converted = Convert.ImplicitConversion (ec, expr, type, loc);
4130 if (converted != null)
4131 return converted;
4132
4133 //
4134 // If no implicit conversion to bool exists, try using `operator true'
4135 //
4136 converted = GetOperatorTrue (ec, expr, loc);
4137 if (converted == null) {
4138 expr.Error_ValueCannotBeConverted (ec, loc, type, false);
4139 return null;
4140 }
4141
4142 return converted;
4143 }
4144 }
4145
4146 /// <summary>
4147 /// Implements the ternary conditional operator (?:)
4148 /// </summary>
4149 public class Conditional : Expression {
4150 Expression expr, true_expr, false_expr;
4151
4152 public Conditional (BooleanExpression expr, Expression true_expr, Expression false_expr)
4153 {
4154 this.expr = expr;
4155 this.true_expr = true_expr;
4156 this.false_expr = false_expr;
4157 this.loc = expr.Location;
4158 }
4159
4160 public Expression Expr {
4161 get {
4162 return expr;
4163 }
4164 }
4165
4166 public Expression TrueExpr {
4167 get {
4168 return true_expr;
4169 }
4170 }
4171
4172 public Expression FalseExpr {
4173 get {
4174 return false_expr;
4175 }
4176 }
4177
4178 public override Expression CreateExpressionTree (ResolveContext ec)
4179 {
4180 Arguments args = new Arguments (3);
4181 args.Add (new Argument (expr.CreateExpressionTree (ec)));
4182 args.Add (new Argument (true_expr.CreateExpressionTree (ec)));
4183 args.Add (new Argument (false_expr.CreateExpressionTree (ec)));
4184 return CreateExpressionFactoryCall (ec, "Condition", args);
4185 }
4186
4187 protected override Expression DoResolve (ResolveContext ec)
4188 {
4189 expr = expr.Resolve (ec);
4190 true_expr = true_expr.Resolve (ec);
4191 false_expr = false_expr.Resolve (ec);
4192
4193 if (true_expr == null || false_expr == null || expr == null)
4194 return null;
4195
4196 eclass = ExprClass.Value;
4197 TypeSpec true_type = true_expr.Type;
4198 TypeSpec false_type = false_expr.Type;
4199 type = true_type;
4200
4201 //
4202 // First, if an implicit conversion exists from true_expr
4203 // to false_expr, then the result type is of type false_expr.Type
4204 //
4205 if (!TypeManager.IsEqual (true_type, false_type)) {
4206 Expression conv = Convert.ImplicitConversion (ec, true_expr, false_type, loc);
4207 if (conv != null) {
4208 //
4209 // Check if both can convert implicitly to each other's type
4210 //
4211 if (Convert.ImplicitConversion (ec, false_expr, true_type, loc) != null) {
4212 ec.Report.Error (172, true_expr.Location,
4213 "Type of conditional expression cannot be determined as `{0}' and `{1}' convert implicitly to each other",
4214 TypeManager.CSharpName (true_type), TypeManager.CSharpName (false_type));
4215 return null;
4216 }
4217 type = false_type;
4218 true_expr = conv;
4219 } else if ((conv = Convert.ImplicitConversion (ec, false_expr, true_type, loc)) != null) {
4220 false_expr = conv;
4221 } else {
4222 ec.Report.Error (173, true_expr.Location,
4223 "Type of conditional expression cannot be determined because there is no implicit conversion between `{0}' and `{1}'",
4224 TypeManager.CSharpName (true_type), TypeManager.CSharpName (false_type));
4225 return null;
4226 }
4227 }
4228
4229 // Dead code optimalization
4230 Constant c = expr as Constant;
4231 if (c != null){
4232 bool is_false = c.IsDefaultValue;
4233 ec.Report.Warning (429, 4, is_false ? true_expr.Location : false_expr.Location, "Unreachable expression code detected");
4234 return ReducedExpression.Create (is_false ? false_expr : true_expr, this).Resolve (ec);
4235 }
4236
4237 return this;
4238 }
4239
4240 public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
4241 {
4242 return null;
4243 }
4244
4245 public override void Emit (EmitContext ec)
4246 {
4247 Label false_target = ec.DefineLabel ();
4248 Label end_target = ec.DefineLabel ();
4249
4250 expr.EmitBranchable (ec, false_target, false);
4251 true_expr.Emit (ec);
4252
4253 if (type.IsInterface) {
4254 LocalBuilder temp = ec.GetTemporaryLocal (type);
4255 ec.Emit (OpCodes.Stloc, temp);
4256 ec.Emit (OpCodes.Ldloc, temp);
4257 ec.FreeTemporaryLocal (temp, type);
4258 }
4259
4260 ec.Emit (OpCodes.Br, end_target);
4261 ec.MarkLabel (false_target);
4262 false_expr.Emit (ec);
4263 ec.MarkLabel (end_target);
4264 }
4265
4266 protected override void CloneTo (CloneContext clonectx, Expression t)
4267 {
4268 Conditional target = (Conditional) t;
4269
4270 target.expr = expr.Clone (clonectx);
4271 target.true_expr = true_expr.Clone (clonectx);
4272 target.false_expr = false_expr.Clone (clonectx);
4273 }
4274 }
4275
4276 public abstract class VariableReference : Expression, IAssignMethod, IMemoryLocation, IVariableReference {
4277 LocalTemporary temp;
4278
4279 #region Abstract
4280 public abstract HoistedVariable GetHoistedVariable (AnonymousExpression ae);
4281 public abstract bool IsFixed { get; }
4282 public abstract bool IsRef { get; }
4283 public abstract string Name { get; }
4284 public abstract void SetHasAddressTaken ();
4285
4286 //
4287 // Variable IL data, it has to be protected to encapsulate hoisted variables
4288 //
4289 protected abstract ILocalVariable Variable { get; }
4290
4291 //
4292 // Variable flow-analysis data
4293 //
4294 public abstract VariableInfo VariableInfo { get; }
4295 #endregion
4296
4297 public virtual void AddressOf (EmitContext ec, AddressOp mode)
4298 {
4299 HoistedVariable hv = GetHoistedVariable (ec);
4300 if (hv != null) {
4301 hv.AddressOf (ec, mode);
4302 return;
4303 }
4304
4305 Variable.EmitAddressOf (ec);
4306 }
4307
4308 public HoistedVariable GetHoistedVariable (ResolveContext rc)
4309 {
4310 return GetHoistedVariable (rc.CurrentAnonymousMethod);
4311 }
4312
4313 public HoistedVariable GetHoistedVariable (EmitContext ec)
4314 {
4315 return GetHoistedVariable (ec.CurrentAnonymousMethod);
4316 }
4317
4318 public override string GetSignatureForError ()
4319 {
4320 return Name;
4321 }
4322
4323 public override void Emit (EmitContext ec)
4324 {
4325 Emit (ec, false);
4326 }
4327
4328 public override void EmitSideEffect (EmitContext ec)
4329 {
4330 // do nothing
4331 }
4332
4333 //
4334 // This method is used by parameters that are references, that are
4335 // being passed as references: we only want to pass the pointer (that
4336 // is already stored in the parameter, not the address of the pointer,
4337 // and not the value of the variable).
4338 //
4339 public void EmitLoad (EmitContext ec)
4340 {
4341 Variable.Emit (ec);
4342 }
4343
4344 public void Emit (EmitContext ec, bool leave_copy)
4345 {
4346 Report.Debug (64, "VARIABLE EMIT", this, Variable, type, IsRef, loc);
4347
4348 HoistedVariable hv = GetHoistedVariable (ec);
4349 if (hv != null) {
4350 hv.Emit (ec, leave_copy);
4351 return;
4352 }
4353
4354 EmitLoad (ec);
4355
4356 if (IsRef) {
4357 //
4358 // If we are a reference, we loaded on the stack a pointer
4359 // Now lets load the real value
4360 //
4361 ec.EmitLoadFromPtr (type);
4362 }
4363
4364 if (leave_copy) {
4365 ec.Emit (OpCodes.Dup);
4366
4367 if (IsRef) {
4368 temp = new LocalTemporary (Type);
4369 temp.Store (ec);
4370 }
4371 }
4372 }
4373
4374 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy,
4375 bool prepare_for_load)
4376 {
4377 HoistedVariable hv = GetHoistedVariable (ec);
4378 if (hv != null) {
4379 hv.EmitAssign (ec, source, leave_copy, prepare_for_load);
4380 return;
4381 }
4382
4383 New n_source = source as New;
4384 if (n_source != null) {
4385 if (!n_source.Emit (ec, this)) {
4386 if (leave_copy)
4387 EmitLoad (ec);
4388 return;
4389 }
4390 } else {
4391 if (IsRef)
4392 EmitLoad (ec);
4393
4394 source.Emit (ec);
4395 }
4396
4397 if (leave_copy) {
4398 ec.Emit (OpCodes.Dup);
4399 if (IsRef) {
4400 temp = new LocalTemporary (Type);
4401 temp.Store (ec);
4402 }
4403 }
4404
4405 if (IsRef)
4406 ec.EmitStoreFromPtr (type);
4407 else
4408 Variable.EmitAssign (ec);
4409
4410 if (temp != null) {
4411 temp.Emit (ec);
4412 temp.Release (ec);
4413 }
4414 }
4415
4416 public bool IsHoisted {
4417 get { return GetHoistedVariable ((AnonymousExpression) null) != null; }
4418 }
4419 }
4420
4421 /// <summary>
4422 /// Local variables
4423 /// </summary>
4424 public class LocalVariableReference : VariableReference {
4425 readonly string name;
4426 public Block Block;
4427 public LocalInfo local_info;
4428 bool is_readonly;
4429
4430 public LocalVariableReference (Block block, string name, Location l)
4431 {
4432 Block = block;
4433 this.name = name;
4434 loc = l;
4435 }
4436
4437 //
4438 // Setting `is_readonly' to false will allow you to create a writable
4439 // reference to a read-only variable. This is used by foreach and using.
4440 //
4441 public LocalVariableReference (Block block, string name, Location l,
4442 LocalInfo local_info, bool is_readonly)
4443 : this (block, name, l)
4444 {
4445 this.local_info = local_info;
4446 this.is_readonly = is_readonly;
4447 }
4448
4449 public override VariableInfo VariableInfo {
4450 get { return local_info.VariableInfo; }
4451 }
4452
4453 public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
4454 {
4455 return local_info.HoistedVariant;
4456 }
4457
4458 //
4459 // A local variable is always fixed
4460 //
4461 public override bool IsFixed {
4462 get { return true; }
4463 }
4464
4465 public override bool IsRef {
4466 get { return false; }
4467 }
4468
4469 public bool IsReadOnly {
4470 get { return is_readonly; }
4471 }
4472
4473 public override string Name {
4474 get { return name; }
4475 }
4476
4477 public bool VerifyAssigned (ResolveContext ec)
4478 {
4479 VariableInfo variable_info = local_info.VariableInfo;
4480 return variable_info == null || variable_info.IsAssigned (ec, loc);
4481 }
4482
4483 void ResolveLocalInfo ()
4484 {
4485 if (local_info == null) {
4486 local_info = Block.GetLocalInfo (Name);
4487 type = local_info.VariableType;
4488 is_readonly = local_info.ReadOnly;
4489 }
4490 }
4491
4492 public override void SetHasAddressTaken ()
4493 {
4494 local_info.AddressTaken = true;
4495 }
4496
4497 public override Expression CreateExpressionTree (ResolveContext ec)
4498 {
4499 HoistedVariable hv = GetHoistedVariable (ec);
4500 if (hv != null)
4501 return hv.CreateExpressionTree ();
4502
4503 Arguments arg = new Arguments (1);
4504 arg.Add (new Argument (this));
4505 return CreateExpressionFactoryCall (ec, "Constant", arg);
4506 }
4507
4508 Expression DoResolveBase (ResolveContext ec)
4509 {
4510 Expression e = Block.GetConstantExpression (Name);
4511 if (e != null)
4512 return e.Resolve (ec);
4513
4514 VerifyAssigned (ec);
4515
4516 //
4517 // If we are referencing a variable from the external block
4518 // flag it for capturing
4519 //
4520 if (ec.MustCaptureVariable (local_info)) {
4521 if (local_info.AddressTaken)
4522 AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, this, loc);
4523
4524 if (ec.IsVariableCapturingRequired) {
4525 AnonymousMethodStorey storey = local_info.Block.Explicit.CreateAnonymousMethodStorey (ec);
4526 storey.CaptureLocalVariable (ec, local_info);
4527 }
4528 }
4529
4530 eclass = ExprClass.Variable;
4531 type = local_info.VariableType;
4532 return this;
4533 }
4534
4535 protected override Expression DoResolve (ResolveContext ec)
4536 {
4537 ResolveLocalInfo ();
4538 local_info.Used = true;
4539
4540 if (type == null && local_info.Type is VarExpr) {
4541 local_info.VariableType = TypeManager.object_type;
4542 Error_VariableIsUsedBeforeItIsDeclared (ec.Report, Name);
4543 return null;
4544 }
4545
4546 return DoResolveBase (ec);
4547 }
4548
4549 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
4550 {
4551 ResolveLocalInfo ();
4552
4553 // is out param
4554 if (right_side == EmptyExpression.OutAccess.Instance)
4555 local_info.Used = true;
4556
4557 // Infer implicitly typed local variable
4558 if (type == null) {
4559 VarExpr ve = local_info.Type as VarExpr;
4560 if (ve != null) {
4561 if (!ve.InferType (ec, right_side))
4562 return null;
4563 type = local_info.VariableType = ve.Type;
4564 }
4565 }
4566
4567 if (is_readonly) {
4568 int code;
4569 string msg;
4570 if (right_side == EmptyExpression.OutAccess.Instance) {
4571 code = 1657; msg = "Cannot pass `{0}' as a ref or out argument because it is a `{1}'";
4572 } else if (right_side == EmptyExpression.LValueMemberAccess) {
4573 code = 1654; msg = "Cannot assign to members of `{0}' because it is a `{1}'";
4574 } else if (right_side == EmptyExpression.LValueMemberOutAccess) {
4575 code = 1655; msg = "Cannot pass members of `{0}' as ref or out arguments because it is a `{1}'";
4576 } else if (right_side == EmptyExpression.UnaryAddress) {
4577 code = 459; msg = "Cannot take the address of {1} `{0}'";
4578 } else {
4579 code = 1656; msg = "Cannot assign to `{0}' because it is a `{1}'";
4580 }
4581 ec.Report.Error (code, loc, msg, Name, local_info.GetReadOnlyContext ());
4582 } else if (VariableInfo != null) {
4583 VariableInfo.SetAssigned (ec);
4584 }
4585
4586 return DoResolveBase (ec);
4587 }
4588
4589 public override int GetHashCode ()
4590 {
4591 return Name.GetHashCode ();
4592 }
4593
4594 public override bool Equals (object obj)
4595 {
4596 LocalVariableReference lvr = obj as LocalVariableReference;
4597 if (lvr == null)
4598 return false;
4599
4600 return Name == lvr.Name && Block == lvr.Block;
4601 }
4602
4603 protected override ILocalVariable Variable {
4604 get { return local_info; }
4605 }
4606
4607 public override string ToString ()
4608 {
4609 return String.Format ("{0} ({1}:{2})", GetType (), Name, loc);
4610 }
4611
4612 protected override void CloneTo (CloneContext clonectx, Expression t)
4613 {
4614 LocalVariableReference target = (LocalVariableReference) t;
4615
4616 target.Block = clonectx.LookupBlock (Block);
4617 if (local_info != null)
4618 target.local_info = clonectx.LookupVariable (local_info);
4619 }
4620 }
4621
4622 /// <summary>
4623 /// This represents a reference to a parameter in the intermediate
4624 /// representation.
4625 /// </summary>
4626 public class ParameterReference : VariableReference {
4627 readonly ToplevelParameterInfo pi;
4628
4629 public ParameterReference (ToplevelParameterInfo pi, Location loc)
4630 {
4631 this.pi = pi;
4632 this.loc = loc;
4633 }
4634
4635 public override bool IsRef {
4636 get { return (pi.Parameter.ModFlags & Parameter.Modifier.ISBYREF) != 0; }
4637 }
4638
4639 bool HasOutModifier {
4640 get { return pi.Parameter.ModFlags == Parameter.Modifier.OUT; }
4641 }
4642
4643 public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
4644 {
4645 return pi.Parameter.HoistedVariant;
4646 }
4647
4648 //
4649 // A ref or out parameter is classified as a moveable variable, even
4650 // if the argument given for the parameter is a fixed variable
4651 //
4652 public override bool IsFixed {
4653 get { return !IsRef; }
4654 }
4655
4656 public override string Name {
4657 get { return Parameter.Name; }
4658 }
4659
4660 public Parameter Parameter {
4661 get { return pi.Parameter; }
4662 }
4663
4664 public override VariableInfo VariableInfo {
4665 get { return pi.VariableInfo; }
4666 }
4667
4668 protected override ILocalVariable Variable {
4669 get { return Parameter; }
4670 }
4671
4672 public bool IsAssigned (ResolveContext ec, Location loc)
4673 {
4674 // HACK: Variables are not captured in probing mode
4675 if (ec.IsInProbingMode)
4676 return true;
4677
4678 if (!ec.DoFlowAnalysis || !HasOutModifier || ec.CurrentBranching.IsAssigned (VariableInfo))
4679 return true;
4680
4681 ec.Report.Error (269, loc, "Use of unassigned out parameter `{0}'", Name);
4682 return false;
4683 }
4684
4685 public override void SetHasAddressTaken ()
4686 {
4687 Parameter.HasAddressTaken = true;
4688 }
4689
4690 void SetAssigned (ResolveContext ec)
4691 {
4692 if (HasOutModifier && ec.DoFlowAnalysis)
4693 ec.CurrentBranching.SetAssigned (VariableInfo);
4694 }
4695
4696 bool DoResolveBase (ResolveContext ec)
4697 {
4698 type = pi.ParameterType;
4699 eclass = ExprClass.Variable;
4700
4701 AnonymousExpression am = ec.CurrentAnonymousMethod;
4702 if (am == null)
4703 return true;
4704
4705 Block b = ec.CurrentBlock;
4706 while (b != null) {
4707 b = b.Toplevel;
4708 IParameterData[] p = b.Toplevel.Parameters.FixedParameters;
4709 for (int i = 0; i < p.Length; ++i) {
4710 if (p [i] != Parameter)
4711 continue;
4712
4713 //
4714 // Don't capture local parameters
4715 //
4716 if (b == ec.CurrentBlock.Toplevel && !am.IsIterator)
4717 return true;
4718
4719 if (IsRef) {
4720 ec.Report.Error (1628, loc,
4721 "Parameter `{0}' cannot be used inside `{1}' when using `ref' or `out' modifier",
4722 Name, am.ContainerType);
4723 }
4724
4725 if (pi.Parameter.HasAddressTaken)
4726 AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, this, loc);
4727
4728 if (ec.IsVariableCapturingRequired && !b.Toplevel.IsExpressionTree) {
4729 AnonymousMethodStorey storey = pi.Block.CreateAnonymousMethodStorey (ec);
4730 storey.CaptureParameter (ec, this);
4731 }
4732
4733 return true;
4734 }
4735
4736 b = b.Parent;
4737 }
4738
4739 return true;
4740 }
4741
4742 public override int GetHashCode ()
4743 {
4744 return Name.GetHashCode ();
4745 }
4746
4747 public override bool Equals (object obj)
4748 {
4749 ParameterReference pr = obj as ParameterReference;
4750 if (pr == null)
4751 return false;
4752
4753 return Name == pr.Name;
4754 }
4755
4756 public override void AddressOf (EmitContext ec, AddressOp mode)
4757 {
4758 //
4759 // ParameterReferences might already be a reference
4760 //
4761 if (IsRef) {
4762 EmitLoad (ec);
4763 return;
4764 }
4765
4766 base.AddressOf (ec, mode);
4767 }
4768
4769 protected override void CloneTo (CloneContext clonectx, Expression target)
4770 {
4771 // Nothing to clone
4772 }
4773
4774 public override Expression CreateExpressionTree (ResolveContext ec)
4775 {
4776 HoistedVariable hv = GetHoistedVariable (ec);
4777 if (hv != null)
4778 return hv.CreateExpressionTree ();
4779
4780 return Parameter.ExpressionTreeVariableReference ();
4781 }
4782
4783 //
4784 // Notice that for ref/out parameters, the type exposed is not the
4785 // same type exposed externally.
4786 //
4787 // for "ref int a":
4788 // externally we expose "int&"
4789 // here we expose "int".
4790 //
4791 // We record this in "is_ref". This means that the type system can treat
4792 // the type as it is expected, but when we generate the code, we generate
4793 // the alternate kind of code.
4794 //
4795 protected override Expression DoResolve (ResolveContext ec)
4796 {
4797 if (!DoResolveBase (ec))
4798 return null;
4799
4800 // HACK: Variables are not captured in probing mode
4801 if (ec.IsInProbingMode)
4802 return this;
4803
4804 if (HasOutModifier && ec.DoFlowAnalysis &&
4805 (!ec.OmitStructFlowAnalysis || !VariableInfo.TypeInfo.IsStruct) && !IsAssigned (ec, loc))
4806 return null;
4807
4808 return this;
4809 }
4810
4811 override public Expression DoResolveLValue (ResolveContext ec, Expression right_side)
4812 {
4813 if (!DoResolveBase (ec))
4814 return null;
4815
4816 SetAssigned (ec);
4817 return this;
4818 }
4819
4820 static public void EmitLdArg (EmitContext ec, int x)
4821 {
4822 switch (x) {
4823 case 0: ec.Emit (OpCodes.Ldarg_0); break;
4824 case 1: ec.Emit (OpCodes.Ldarg_1); break;
4825 case 2: ec.Emit (OpCodes.Ldarg_2); break;
4826 case 3: ec.Emit (OpCodes.Ldarg_3); break;
4827 default:
4828 if (x > byte.MaxValue)
4829 ec.Emit (OpCodes.Ldarg, x);
4830 else
4831 ec.Emit (OpCodes.Ldarg_S, (byte) x);
4832 break;
4833 }
4834 }
4835 }
4836
4837 /// <summary>
4838 /// Invocation of methods or delegates.
4839 /// </summary>
4840 public class Invocation : ExpressionStatement
4841 {
4842 protected Arguments arguments;
4843 protected Expression expr;
4844 protected MethodGroupExpr mg;
4845 bool arguments_resolved;
4846
4847 //
4848 // arguments is an ArrayList, but we do not want to typecast,
4849 // as it might be null.
4850 //
4851 public Invocation (Expression expr, Arguments arguments)
4852 {
4853 SimpleName sn = expr as SimpleName;
4854 if (sn != null)
4855 this.expr = sn.GetMethodGroup ();
4856 else
4857 this.expr = expr;
4858
4859 this.arguments = arguments;
4860 if (expr != null)
4861 loc = expr.Location;
4862 }
4863
4864 public Invocation (Expression expr, Arguments arguments, bool arguments_resolved)
4865 : this (expr, arguments)
4866 {
4867 this.arguments_resolved = arguments_resolved;
4868 }
4869
4870 public override Expression CreateExpressionTree (ResolveContext ec)
4871 {
4872 Expression instance = mg.IsInstance ?
4873 mg.InstanceExpression.CreateExpressionTree (ec) :
4874 new NullLiteral (loc);
4875
4876 var args = Arguments.CreateForExpressionTree (ec, arguments,
4877 instance,
4878 mg.CreateExpressionTree (ec));
4879
4880 if (mg.IsBase)
4881 MemberExpr.Error_BaseAccessInExpressionTree (ec, loc);
4882
4883 return CreateExpressionFactoryCall (ec, "Call", args);
4884 }
4885
4886 protected override Expression DoResolve (ResolveContext ec)
4887 {
4888 Expression member_expr = expr.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
4889 if (member_expr == null)
4890 return null;
4891
4892 //
4893 // Next, evaluate all the expressions in the argument list
4894 //
4895 bool dynamic_arg = false;
4896 if (arguments != null && !arguments_resolved)
4897 arguments.Resolve (ec, out dynamic_arg);
4898
4899 TypeSpec expr_type = member_expr.Type;
4900 mg = member_expr as MethodGroupExpr;
4901
4902 bool dynamic_member = expr_type == InternalType.Dynamic;
4903
4904 if (!dynamic_member) {
4905 Expression invoke = null;
4906
4907 if (mg == null) {
4908 if (expr_type != null && TypeManager.IsDelegateType (expr_type)) {
4909 invoke = new DelegateInvocation (member_expr, arguments, loc);
4910 invoke = invoke.Resolve (ec);
4911 if (invoke == null || !dynamic_arg)
4912 return invoke;
4913 } else {
4914 MemberExpr me = member_expr as MemberExpr;
4915 if (me == null) {
4916 member_expr.Error_UnexpectedKind (ec, ResolveFlags.MethodGroup, loc);
4917 return null;
4918 }
4919
4920 mg = ec.LookupExtensionMethod (me.Type, me.Name, -1, loc);
4921 if (mg == null) {
4922 ec.Report.Error (1955, loc, "The member `{0}' cannot be used as method or delegate",
4923 member_expr.GetSignatureForError ());
4924 return null;
4925 }
4926
4927 ((ExtensionMethodGroupExpr) mg).ExtensionExpression = me.InstanceExpression;
4928 }
4929 }
4930
4931 if (invoke == null) {
4932 mg = DoResolveOverload (ec);
4933 if (mg == null)
4934 return null;
4935 }
4936 }
4937
4938 if (dynamic_arg || dynamic_member)
4939 return DoResolveDynamic (ec, member_expr);
4940
4941 var method = mg.BestCandidate;
4942 if (method != null) {
4943 type = method.ReturnType;
4944 }
4945
4946 //
4947 // Only base will allow this invocation to happen.
4948 //
4949 if (mg.IsBase && method.IsAbstract){
4950 Error_CannotCallAbstractBase (ec, TypeManager.CSharpSignature (method));
4951 return null;
4952 }
4953
4954 if (arguments == null && method.DeclaringType == TypeManager.object_type && method.Name == Destructor.MetadataName) {
4955 if (mg.IsBase)
4956 ec.Report.Error (250, loc, "Do not directly call your base class Finalize method. It is called automatically from your destructor");
4957 else
4958 ec.Report.Error (245, loc, "Destructors and object.Finalize cannot be called directly. Consider calling IDisposable.Dispose if available");
4959 return null;
4960 }
4961
4962 IsSpecialMethodInvocation (ec, method, loc);
4963
4964 if (mg.InstanceExpression != null)
4965 mg.InstanceExpression.CheckMarshalByRefAccess (ec);
4966
4967 eclass = ExprClass.Value;
4968 return this;
4969 }
4970
4971 Expression DoResolveDynamic (ResolveContext ec, Expression memberExpr)
4972 {
4973 Arguments args;
4974 DynamicMemberBinder dmb = memberExpr as DynamicMemberBinder;
4975 if (dmb != null) {
4976 args = dmb.Arguments;
4977 if (arguments != null)
4978 args.AddRange (arguments);
4979 } else if (mg == null) {
4980 if (arguments == null)
4981 args = new Arguments (1);
4982 else
4983 args = arguments;
4984
4985 args.Insert (0, new Argument (memberExpr));
4986 this.expr = null;
4987 } else {
4988 if (mg.IsBase) {
4989 ec.Report.Error (1971, loc,
4990 "The base call to method `{0}' cannot be dynamically dispatched. Consider casting the dynamic arguments or eliminating the base access",
4991 mg.Name);
4992 return null;
4993 }
4994
4995 args = arguments;
4996
4997 if (mg.IsStatic != mg.IsInstance) {
4998 if (args == null)
4999 args = new Arguments (1);
5000
5001 if (mg.IsStatic) {
5002 args.Insert (0, new Argument (new TypeOf (new TypeExpression (mg.DeclaringType, loc), loc).Resolve (ec), Argument.AType.DynamicTypeName));
5003 } else {
5004 MemberAccess ma = expr as MemberAccess;
5005 if (ma != null)
5006 args.Insert (0, new Argument (ma.Left.Resolve (ec)));
5007 else
5008 args.Insert (0, new Argument (new This (loc).Resolve (ec)));
5009 }
5010 }
5011 }
5012
5013 return new DynamicInvocation (expr as ATypeNameExpression, args, loc).Resolve (ec);
5014 }
5015
5016 protected virtual MethodGroupExpr DoResolveOverload (ResolveContext ec)
5017 {
5018 return mg.OverloadResolve (ec, ref arguments, false, loc);
5019 }
5020
5021 public static bool IsSpecialMethodInvocation (ResolveContext ec, MethodSpec method, Location loc)
5022 {
5023 if (!method.IsReservedMethod)
5024 return false;
5025
5026 if (ec.HasSet (ResolveContext.Options.InvokeSpecialName))
5027 return false;
5028
5029 ec.Report.SymbolRelatedToPreviousError (method);
5030 ec.Report.Error (571, loc, "`{0}': cannot explicitly call operator or accessor",
5031 method.GetSignatureForError ());
5032
5033 return true;
5034 }
5035
5036 static Type[] GetVarargsTypes (MethodSpec mb, Arguments arguments)
5037 {
5038 AParametersCollection pd = mb.Parameters;
5039
5040 Argument a = arguments [pd.Count - 1];
5041 Arglist list = (Arglist) a.Expr;
5042
5043 return list.ArgumentTypes;
5044 }
5045
5046 /// <remarks>
5047 /// is_base tells whether we want to force the use of the `call'
5048 /// opcode instead of using callvirt. Call is required to call
5049 /// a specific method, while callvirt will always use the most
5050 /// recent method in the vtable.
5051 ///
5052 /// is_static tells whether this is an invocation on a static method
5053 ///
5054 /// instance_expr is an expression that represents the instance
5055 /// it must be non-null if is_static is false.
5056 ///
5057 /// method is the method to invoke.
5058 ///
5059 /// Arguments is the list of arguments to pass to the method or constructor.
5060 /// </remarks>
5061 public static void EmitCall (EmitContext ec, bool is_base,
5062 Expression instance_expr,
5063 MethodSpec method, Arguments Arguments, Location loc)
5064 {
5065 EmitCall (ec, is_base, instance_expr, method, Arguments, loc, false, false);
5066 }
5067
5068 // `dup_args' leaves an extra copy of the arguments on the stack
5069 // `omit_args' does not leave any arguments at all.
5070 // So, basically, you could make one call with `dup_args' set to true,
5071 // and then another with `omit_args' set to true, and the two calls
5072 // would have the same set of arguments. However, each argument would
5073 // only have been evaluated once.
5074 public static void EmitCall (EmitContext ec, bool is_base,
5075 Expression instance_expr,
5076 MethodSpec method, Arguments Arguments, Location loc,
5077 bool dup_args, bool omit_args)
5078 {
5079 LocalTemporary this_arg = null;
5080
5081 TypeSpec decl_type = method.DeclaringType;
5082
5083 // Speed up the check by not doing it on not allowed targets
5084 if (method.ReturnType == TypeManager.void_type && method.IsConditionallyExcluded (loc))
5085 return;
5086
5087 OpCode call_op;
5088 TypeSpec iexpr_type;
5089
5090 if (method.IsStatic) {
5091 iexpr_type = null;
5092 call_op = OpCodes.Call;
5093 } else {
5094 iexpr_type = instance_expr.Type;
5095
5096 if (is_base || decl_type.IsStruct || decl_type.IsEnum || (instance_expr is This && !method.IsVirtual)) {
5097 call_op = OpCodes.Call;
5098 } else {
5099 call_op = OpCodes.Callvirt;
5100 }
5101
5102 //
5103 // If this is ourselves, push "this"
5104 //
5105 if (!omit_args) {
5106 TypeSpec t = iexpr_type;
5107
5108 //
5109 // Push the instance expression
5110 //
5111 if ((iexpr_type.IsStruct && (call_op == OpCodes.Callvirt || (call_op == OpCodes.Call && decl_type == iexpr_type))) ||
5112 iexpr_type.IsGenericParameter || TypeManager.IsNullableType (decl_type)) {
5113 //
5114 // If the expression implements IMemoryLocation, then
5115 // we can optimize and use AddressOf on the
5116 // return.
5117 //
5118 // If not we have to use some temporary storage for
5119 // it.
5120 var iml = instance_expr as IMemoryLocation;
5121 if (iml != null) {
5122 iml.AddressOf (ec, AddressOp.LoadStore);
5123 } else {
5124 LocalTemporary temp = new LocalTemporary (iexpr_type);
5125 instance_expr.Emit (ec);
5126 temp.Store (ec);
5127 temp.AddressOf (ec, AddressOp.Load);
5128 }
5129
5130 // avoid the overhead of doing this all the time.
5131 if (dup_args)
5132 t = ReferenceContainer.MakeType (iexpr_type);
5133 } else if (iexpr_type.IsEnum || iexpr_type.IsStruct) {
5134 instance_expr.Emit (ec);
5135 ec.Emit (OpCodes.Box, iexpr_type);
5136 t = iexpr_type = TypeManager.object_type;
5137 } else {
5138 instance_expr.Emit (ec);
5139 }
5140
5141 if (dup_args) {
5142 ec.Emit (OpCodes.Dup);
5143 if (Arguments != null && Arguments.Count != 0) {
5144 this_arg = new LocalTemporary (t);
5145 this_arg.Store (ec);
5146 }
5147 }
5148 }
5149 }
5150
5151 if (!omit_args && Arguments != null)
5152 Arguments.Emit (ec, dup_args, this_arg);
5153
5154 if (call_op == OpCodes.Callvirt && (iexpr_type.IsGenericParameter || iexpr_type.IsStruct)) {
5155 ec.Emit (OpCodes.Constrained, iexpr_type);
5156 }
5157
5158 if (method.Parameters.HasArglist) {
5159 Type[] varargs_types = GetVarargsTypes (method, Arguments);
5160 ec.Emit (call_op, method, varargs_types);
5161 return;
5162 }
5163
5164 //
5165 // If you have:
5166 // this.DoFoo ();
5167 // and DoFoo is not virtual, you can omit the callvirt,
5168 // because you don't need the null checking behavior.
5169 //
5170 ec.Emit (call_op, method);
5171 }
5172
5173 public override void Emit (EmitContext ec)
5174 {
5175 mg.EmitCall (ec, arguments);
5176 }
5177
5178 public override void EmitStatement (EmitContext ec)
5179 {
5180 Emit (ec);
5181
5182 //
5183 // Pop the return value if there is one
5184 //
5185 if (type != TypeManager.void_type)
5186 ec.Emit (OpCodes.Pop);
5187 }
5188
5189 protected override void CloneTo (CloneContext clonectx, Expression t)
5190 {
5191 Invocation target = (Invocation) t;
5192
5193 if (arguments != null)
5194 target.arguments = arguments.Clone (clonectx);
5195
5196 target.expr = expr.Clone (clonectx);
5197 }
5198
5199 public override SLE.Expression MakeExpression (BuilderContext ctx)
5200 {
5201 return MakeExpression (ctx, mg.InstanceExpression, (MethodSpec) mg, arguments);
5202 }
5203
5204 public static SLE.Expression MakeExpression (BuilderContext ctx, Expression instance, MethodSpec mi, Arguments args)
5205 {
5206 var instance_expr = instance == null ? null : instance.MakeExpression (ctx);
5207 return SLE.Expression.Call (instance_expr, (MethodInfo) mi.GetMetaInfo (), Arguments.MakeExpression (args, ctx));
5208 }
5209 }
5210
5211 /// <summary>
5212 /// Implements the new expression
5213 /// </summary>
5214 public class New : ExpressionStatement, IMemoryLocation {
5215 protected Arguments Arguments;
5216
5217 //
5218 // During bootstrap, it contains the RequestedType,
5219 // but if `type' is not null, it *might* contain a NewDelegate
5220 // (because of field multi-initialization)
5221 //
5222 protected Expression RequestedType;
5223
5224 protected MethodGroupExpr method;
5225
5226 public New (Expression requested_type, Arguments arguments, Location l)
5227 {
5228 RequestedType = requested_type;
5229 Arguments = arguments;
5230 loc = l;
5231 }
5232
5233 /// <summary>
5234 /// Converts complex core type syntax like 'new int ()' to simple constant
5235 /// </summary>
5236 public static Constant Constantify (TypeSpec t)
5237 {
5238 if (t == TypeManager.int32_type)
5239 return new IntConstant (0, Location.Null);
5240 if (t == TypeManager.uint32_type)
5241 return new UIntConstant (0, Location.Null);
5242 if (t == TypeManager.int64_type)
5243 return new LongConstant (0, Location.Null);
5244 if (t == TypeManager.uint64_type)
5245 return new ULongConstant (0, Location.Null);
5246 if (t == TypeManager.float_type)
5247 return new FloatConstant (0, Location.Null);
5248 if (t == TypeManager.double_type)
5249 return new DoubleConstant (0, Location.Null);
5250 if (t == TypeManager.short_type)
5251 return new ShortConstant (0, Location.Null);
5252 if (t == TypeManager.ushort_type)
5253 return new UShortConstant (0, Location.Null);
5254 if (t == TypeManager.sbyte_type)
5255 return new SByteConstant (0, Location.Null);
5256 if (t == TypeManager.byte_type)
5257 return new ByteConstant (0, Location.Null);
5258 if (t == TypeManager.char_type)
5259 return new CharConstant ('\0', Location.Null);
5260 if (t == TypeManager.bool_type)
5261 return new BoolConstant (false, Location.Null);
5262 if (t == TypeManager.decimal_type)
5263 return new DecimalConstant (0, Location.Null);
5264 if (TypeManager.IsEnumType (t))
5265 return new EnumConstant (Constantify (EnumSpec.GetUnderlyingType (t)), t);
5266 if (TypeManager.IsNullableType (t))
5267 return Nullable.LiftedNull.Create (t, Location.Null);
5268
5269 return null;
5270 }
5271
5272 //
5273 // Checks whether the type is an interface that has the
5274 // [ComImport, CoClass] attributes and must be treated
5275 // specially
5276 //
5277 public Expression CheckComImport (ResolveContext ec)
5278 {
5279 if (!type.IsInterface)
5280 return null;
5281
5282 //
5283 // Turn the call into:
5284 // (the-interface-stated) (new class-referenced-in-coclassattribute ())
5285 //
5286 var real_class = type.MemberDefinition.GetAttributeCoClass ();
5287 if (real_class == null)
5288 return null;
5289
5290 New proxy = new New (new TypeExpression (real_class, loc), Arguments, loc);
5291 Cast cast = new Cast (new TypeExpression (type, loc), proxy, loc);
5292 return cast.Resolve (ec);
5293 }
5294
5295 public override Expression CreateExpressionTree (ResolveContext ec)
5296 {
5297 Arguments args;
5298 if (method == null) {
5299 args = new Arguments (1);
5300 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
5301 } else {
5302 args = Arguments.CreateForExpressionTree (ec,
5303 Arguments,
5304 method.CreateExpressionTree (ec));
5305 }
5306
5307 return CreateExpressionFactoryCall (ec, "New", args);
5308 }
5309
5310 protected override Expression DoResolve (ResolveContext ec)
5311 {
5312 //
5313 // The New DoResolve might be called twice when initializing field
5314 // expressions (see EmitFieldInitializers, the call to
5315 // GetInitializerExpression will perform a resolve on the expression,
5316 // and later the assign will trigger another resolution
5317 //
5318 // This leads to bugs (#37014)
5319 //
5320 if (type != null){
5321 if (RequestedType is NewDelegate)
5322 return RequestedType;
5323 return this;
5324 }
5325
5326 TypeExpr texpr = RequestedType.ResolveAsTypeTerminal (ec, false);
5327 if (texpr == null)
5328 return null;
5329
5330 type = texpr.Type;
5331
5332 if (type.IsPointer) {
5333 ec.Report.Error (1919, loc, "Unsafe type `{0}' cannot be used in an object creation expression",
5334 TypeManager.CSharpName (type));
5335 return null;
5336 }
5337
5338 if (Arguments == null) {
5339 Constant c = Constantify (type);
5340 if (c != null)
5341 return ReducedExpression.Create (c.Resolve (ec), this);
5342 }
5343
5344 if (TypeManager.IsDelegateType (type)) {
5345 return (new NewDelegate (type, Arguments, loc)).Resolve (ec);
5346 }
5347
5348 var tparam = type as TypeParameterSpec;
5349 if (tparam != null) {
5350 if (!tparam.HasSpecialConstructor && !tparam.HasSpecialStruct) {
5351 ec.Report.Error (304, loc,
5352 "Cannot create an instance of the variable type `{0}' because it does not have the new() constraint",
5353 TypeManager.CSharpName (type));
5354 }
5355
5356 if ((Arguments != null) && (Arguments.Count != 0)) {
5357 ec.Report.Error (417, loc,
5358 "`{0}': cannot provide arguments when creating an instance of a variable type",
5359 TypeManager.CSharpName (type));
5360 }
5361
5362 if (TypeManager.activator_create_instance == null) {
5363 TypeSpec activator_type = TypeManager.CoreLookupType (ec.Compiler, "System", "Activator", MemberKind.Class, true);
5364 if (activator_type != null) {
5365 TypeManager.activator_create_instance = TypeManager.GetPredefinedMethod (
5366 activator_type, MemberFilter.Method ("CreateInstance", 1, ParametersCompiled.EmptyReadOnlyParameters, null), loc);
5367 }
5368 }
5369
5370 eclass = ExprClass.Value;
5371 return this;
5372 }
5373
5374 if (type.IsStatic) {
5375 ec.Report.SymbolRelatedToPreviousError (type);
5376 ec.Report.Error (712, loc, "Cannot create an instance of the static class `{0}'", TypeManager.CSharpName (type));
5377 return null;
5378 }
5379
5380 if (type.IsInterface || type.IsAbstract){
5381 if (!TypeManager.IsGenericType (type)) {
5382 RequestedType = CheckComImport (ec);
5383 if (RequestedType != null)
5384 return RequestedType;
5385 }
5386
5387 ec.Report.SymbolRelatedToPreviousError (type);
5388 ec.Report.Error (144, loc, "Cannot create an instance of the abstract class or interface `{0}'", TypeManager.CSharpName (type));
5389 return null;
5390 }
5391
5392 bool is_struct = TypeManager.IsStruct (type);
5393 eclass = ExprClass.Value;
5394
5395 //
5396 // SRE returns a match for .ctor () on structs (the object constructor),
5397 // so we have to manually ignore it.
5398 //
5399 if (is_struct && Arguments == null)
5400 return this;
5401
5402 // For member-lookup, treat 'new Foo (bar)' as call to 'foo.ctor (bar)', where 'foo' is of type 'Foo'.
5403 Expression ml = MemberLookupFinal (ec, type, type, ConstructorInfo.ConstructorName, 0,
5404 MemberKind.Constructor, BindingRestriction.AccessibleOnly | BindingRestriction.DeclaredOnly, loc);
5405
5406 bool dynamic;
5407 if (Arguments != null) {
5408 Arguments.Resolve (ec, out dynamic);
5409 } else {
5410 dynamic = false;
5411 }
5412
5413 if (ml == null)
5414 return null;
5415
5416 method = ml as MethodGroupExpr;
5417 if (method == null) {
5418 ml.Error_UnexpectedKind (ec, ResolveFlags.MethodGroup, loc);
5419 return null;
5420 }
5421
5422 method = method.OverloadResolve (ec, ref Arguments, false, loc);
5423 if (method == null)
5424 return null;
5425
5426 if (dynamic) {
5427 Arguments.Insert (0, new Argument (new TypeOf (texpr, loc).Resolve (ec), Argument.AType.DynamicTypeName));
5428 return new DynamicConstructorBinder (type, Arguments, loc).Resolve (ec);
5429 }
5430
5431 return this;
5432 }
5433
5434 bool DoEmitTypeParameter (EmitContext ec)
5435 {
5436 var ctor_factory = TypeManager.activator_create_instance.MakeGenericMethod (type);
5437 var tparam = (TypeParameterSpec) type;
5438
5439 if (tparam.IsReferenceType) {
5440 ec.Emit (OpCodes.Call, ctor_factory);
5441 return true;
5442 }
5443
5444 // Allow DoEmit() to be called multiple times.
5445 // We need to create a new LocalTemporary each time since
5446 // you can't share LocalBuilders among ILGeneators.
5447 LocalTemporary temp = new LocalTemporary (type);
5448
5449 Label label_activator = ec.DefineLabel ();
5450 Label label_end = ec.DefineLabel ();
5451
5452 temp.AddressOf (ec, AddressOp.Store);
5453 ec.Emit (OpCodes.Initobj, type);
5454
5455 temp.Emit (ec);
5456 ec.Emit (OpCodes.Box, type);
5457 ec.Emit (OpCodes.Brfalse, label_activator);
5458
5459 temp.AddressOf (ec, AddressOp.Store);
5460 ec.Emit (OpCodes.Initobj, type);
5461 temp.Emit (ec);
5462 ec.Emit (OpCodes.Br_S, label_end);
5463
5464 ec.MarkLabel (label_activator);
5465
5466 ec.Emit (OpCodes.Call, ctor_factory);
5467 ec.MarkLabel (label_end);
5468 return true;
5469 }
5470
5471 //
5472 // This Emit can be invoked in two contexts:
5473 // * As a mechanism that will leave a value on the stack (new object)
5474 // * As one that wont (init struct)
5475 //
5476 // If we are dealing with a ValueType, we have a few
5477 // situations to deal with:
5478 //
5479 // * The target is a ValueType, and we have been provided
5480 // the instance (this is easy, we are being assigned).
5481 //
5482 // * The target of New is being passed as an argument,
5483 // to a boxing operation or a function that takes a
5484 // ValueType.
5485 //
5486 // In this case, we need to create a temporary variable
5487 // that is the argument of New.
5488 //
5489 // Returns whether a value is left on the stack
5490 //
5491 // *** Implementation note ***
5492 //
5493 // To benefit from this optimization, each assignable expression
5494 // has to manually cast to New and call this Emit.
5495 //
5496 // TODO: It's worth to implement it for arrays and fields
5497 //
5498 public virtual bool Emit (EmitContext ec, IMemoryLocation target)
5499 {
5500 bool is_value_type = TypeManager.IsValueType (type);
5501 VariableReference vr = target as VariableReference;
5502
5503 if (target != null && is_value_type && (vr != null || method == null)) {
5504 target.AddressOf (ec, AddressOp.Store);
5505 } else if (vr != null && vr.IsRef) {
5506 vr.EmitLoad (ec);
5507 }
5508
5509 if (Arguments != null)
5510 Arguments.Emit (ec);
5511
5512 if (is_value_type) {
5513 if (method == null) {
5514 ec.Emit (OpCodes.Initobj, type);
5515 return false;
5516 }
5517
5518 if (vr != null) {
5519 ec.Emit (OpCodes.Call, method.BestCandidate);
5520 return false;
5521 }
5522 }
5523
5524 if (type is TypeParameterSpec)
5525 return DoEmitTypeParameter (ec);
5526
5527 ec.Emit (OpCodes.Newobj, method.BestCandidate);
5528 return true;
5529 }
5530
5531 public override void Emit (EmitContext ec)
5532 {
5533 LocalTemporary v = null;
5534 if (method == null && TypeManager.IsValueType (type)) {
5535 // TODO: Use temporary variable from pool
5536 v = new LocalTemporary (type);
5537 }
5538
5539 if (!Emit (ec, v))
5540 v.Emit (ec);
5541 }
5542
5543 public override void EmitStatement (EmitContext ec)
5544 {
5545 LocalTemporary v = null;
5546 if (method == null && TypeManager.IsValueType (type)) {
5547 // TODO: Use temporary variable from pool
5548 v = new LocalTemporary (type);
5549 }
5550
5551 if (Emit (ec, v))
5552 ec.Emit (OpCodes.Pop);
5553 }
5554
5555 public virtual bool HasInitializer {
5556 get {
5557 return false;
5558 }
5559 }
5560
5561 public void AddressOf (EmitContext ec, AddressOp mode)
5562 {
5563 EmitAddressOf (ec, mode);
5564 }
5565
5566 protected virtual IMemoryLocation EmitAddressOf (EmitContext ec, AddressOp mode)
5567 {
5568 LocalTemporary value_target = new LocalTemporary (type);
5569
5570 if (type is TypeParameterSpec) {
5571 DoEmitTypeParameter (ec);
5572 value_target.Store (ec);
5573 value_target.AddressOf (ec, mode);
5574 return value_target;
5575 }
5576
5577 if (!TypeManager.IsStruct (type)){
5578 //
5579 // We throw an exception. So far, I believe we only need to support
5580 // value types:
5581 // foreach (int j in new StructType ())
5582 // see bug 42390
5583 //
5584 throw new Exception ("AddressOf should not be used for classes");
5585 }
5586
5587 value_target.AddressOf (ec, AddressOp.Store);
5588
5589 if (method == null) {
5590 ec.Emit (OpCodes.Initobj, type);
5591 } else {
5592 if (Arguments != null)
5593 Arguments.Emit (ec);
5594
5595 ec.Emit (OpCodes.Call, method.BestCandidate);
5596 }
5597
5598 value_target.AddressOf (ec, mode);
5599 return value_target;
5600 }
5601
5602 protected override void CloneTo (CloneContext clonectx, Expression t)
5603 {
5604 New target = (New) t;
5605
5606 target.RequestedType = RequestedType.Clone (clonectx);
5607 if (Arguments != null){
5608 target.Arguments = Arguments.Clone (clonectx);
5609 }
5610 }
5611
5612 public override SLE.Expression MakeExpression (BuilderContext ctx)
5613 {
5614 return SLE.Expression.New ((ConstructorInfo) method.BestCandidate.GetMetaInfo (), Arguments.MakeExpression (Arguments, ctx));
5615 }
5616 }
5617
5618 public class ArrayInitializer : ShimExpression
5619 {
5620 List<Expression> elements;
5621
5622 public ArrayInitializer (List<Expression> init, Location loc)
5623 : base (null)
5624 {
5625 elements = init;
5626 }
5627
5628 public ArrayInitializer (int count, Location loc)
5629 : base (null)
5630 {
5631 elements = new List<Expression> (count);
5632 }
5633
5634 public ArrayInitializer (Location loc)
5635 : this (4, loc)
5636 {
5637 }
5638
5639 public void Add (Expression expr)
5640 {
5641 elements.Add (expr);
5642 }
5643
5644 protected override void CloneTo (CloneContext clonectx, Expression t)
5645 {
5646 var target = (ArrayInitializer) t;
5647
5648 target.elements = new List<Expression> (elements.Count);
5649 foreach (var element in elements)
5650 target.elements.Add (element.Clone (clonectx));
5651
5652 base.CloneTo (clonectx, t);
5653 }
5654
5655 public int Count {
5656 get { return elements.Count; }
5657 }
5658
5659 protected override Expression DoResolve (ResolveContext rc)
5660 {
5661 throw new NotImplementedException ();
5662 }
5663
5664 public Expression this [int index] {
5665 get { return elements [index]; }
5666 }
5667 }
5668
5669 /// <summary>
5670 /// 14.5.10.2: Represents an array creation expression.
5671 /// </summary>
5672 ///
5673 /// <remarks>
5674 /// There are two possible scenarios here: one is an array creation
5675 /// expression that specifies the dimensions and optionally the
5676 /// initialization data and the other which does not need dimensions
5677 /// specified but where initialization data is mandatory.
5678 /// </remarks>
5679 public class ArrayCreation : Expression
5680 {
5681 FullNamedExpression requested_base_type;
5682 ArrayInitializer initializers;
5683
5684 //
5685 // The list of Argument types.
5686 // This is used to construct the `newarray' or constructor signature
5687 //
5688 protected List<Expression> arguments;
5689
5690 protected TypeSpec array_element_type;
5691 int num_arguments = 0;
5692 protected int dimensions;
5693 protected readonly string rank;
5694 Expression first_emit;
5695 LocalTemporary first_emit_temp;
5696
5697 protected List<Expression> array_data;
5698
5699 Dictionary<int, int> bounds;
5700
5701 // The number of constants in array initializers
5702 int const_initializers_count;
5703 bool only_constant_initializers;
5704
5705 public ArrayCreation (FullNamedExpression requested_base_type, List<Expression> exprs, string rank, ArrayInitializer initializers, Location l)
5706 {
5707 this.requested_base_type = requested_base_type;
5708 this.initializers = initializers;
5709 this.rank = rank;
5710 loc = l;
5711
5712 arguments = new List<Expression> (exprs);
5713 num_arguments = arguments.Count;
5714 }
5715
5716 public ArrayCreation (FullNamedExpression requested_base_type, string rank, ArrayInitializer initializers, Location l)
5717 {
5718 this.requested_base_type = requested_base_type;
5719 this.initializers = initializers;
5720 this.rank = rank;
5721 loc = l;
5722 }
5723
5724 protected override void Error_NegativeArrayIndex (ResolveContext ec, Location loc)
5725 {
5726 ec.Report.Error (248, loc, "Cannot create an array with a negative size");
5727 }
5728
5729 bool CheckIndices (ResolveContext ec, ArrayInitializer probe, int idx, bool specified_dims, int child_bounds)
5730 {
5731 if (initializers != null && bounds == null) {
5732 //
5733 // We use this to store all the date values in the order in which we
5734 // will need to store them in the byte blob later
5735 //
5736 array_data = new List<Expression> ();
5737 bounds = new Dictionary<int, int> ();
5738 }
5739
5740 if (specified_dims) {
5741 Expression a = arguments [idx];
5742 a = a.Resolve (ec);
5743 if (a == null)
5744 return false;
5745
5746 a = ConvertExpressionToArrayIndex (ec, a);
5747 if (a == null)
5748 return false;
5749
5750 arguments[idx] = a;
5751
5752 if (initializers != null) {
5753 Constant c = a as Constant;
5754 if (c == null && a is ArrayIndexCast)
5755 c = ((ArrayIndexCast) a).Child as Constant;
5756
5757 if (c == null) {
5758 ec.Report.Error (150, a.Location, "A constant value is expected");
5759 return false;
5760 }
5761
5762 int value;
5763 try {
5764 value = System.Convert.ToInt32 (c.GetValue ());
5765 } catch {
5766 ec.Report.Error (150, a.Location, "A constant value is expected");
5767 return false;
5768 }
5769
5770 // TODO: probe.Count does not fit ulong in
5771 if (value != probe.Count) {
5772 ec.Report.Error (847, loc, "An array initializer of length `{0}' was expected", value.ToString ());
5773 return false;
5774 }
5775
5776 bounds[idx] = value;
5777 }
5778 }
5779
5780 if (initializers == null)
5781 return true;
5782
5783 only_constant_initializers = true;
5784 for (int i = 0; i < probe.Count; ++i) {
5785 var o = probe [i];
5786 if (o is ArrayInitializer) {
5787 var sub_probe = o as ArrayInitializer;
5788 if (idx + 1 >= dimensions){
5789 ec.Report.Error (623, loc, "Array initializers can only be used in a variable or field initializer. Try using a new expression instead");
5790 return false;
5791 }
5792
5793 bool ret = CheckIndices (ec, sub_probe, idx + 1, specified_dims, child_bounds - 1);
5794 if (!ret)
5795 return false;
5796 } else if (child_bounds > 1) {
5797 ec.Report.Error (846, o.Location, "A nested array initializer was expected");
5798 } else {
5799 Expression element = ResolveArrayElement (ec, o);
5800 if (element == null)
5801 continue;
5802
5803 // Initializers with the default values can be ignored
5804 Constant c = element as Constant;
5805 if (c != null) {
5806 if (!c.IsDefaultInitializer (array_element_type)) {
5807 ++const_initializers_count;
5808 }
5809 } else {
5810 only_constant_initializers = false;
5811 }
5812
5813 array_data.Add (element);
5814 }
5815 }
5816
5817 return true;
5818 }
5819
5820 public override Expression CreateExpressionTree (ResolveContext ec)
5821 {
5822 Arguments args;
5823
5824 if (array_data == null) {
5825 args = new Arguments (arguments.Count + 1);
5826 args.Add (new Argument (new TypeOf (new TypeExpression (array_element_type, loc), loc)));
5827 foreach (Expression a in arguments)
5828 args.Add (new Argument (a.CreateExpressionTree (ec)));
5829
5830 return CreateExpressionFactoryCall (ec, "NewArrayBounds", args);
5831 }
5832
5833 if (dimensions > 1) {
5834 ec.Report.Error (838, loc, "An expression tree cannot contain a multidimensional array initializer");
5835 return null;
5836 }
5837
5838 args = new Arguments (array_data == null ? 1 : array_data.Count + 1);
5839 args.Add (new Argument (new TypeOf (new TypeExpression (array_element_type, loc), loc)));
5840 if (array_data != null) {
5841 for (int i = 0; i < array_data.Count; ++i) {
5842 Expression e = array_data [i];
5843 args.Add (new Argument (e.CreateExpressionTree (ec)));
5844 }
5845 }
5846
5847 return CreateExpressionFactoryCall (ec, "NewArrayInit", args);
5848 }
5849
5850 public void UpdateIndices ()
5851 {
5852 int i = 0;
5853 for (var probe = initializers; probe != null;) {
5854 if (probe.Count > 0 && probe [0] is ArrayInitializer) {
5855 Expression e = new IntConstant (probe.Count, Location.Null);
5856 arguments.Add (e);
5857
5858 bounds [i++] = probe.Count;
5859
5860 probe = (ArrayInitializer) probe[0];
5861
5862 } else {
5863 Expression e = new IntConstant (probe.Count, Location.Null);
5864 arguments.Add (e);
5865
5866 bounds [i++] = probe.Count;
5867 return;
5868 }
5869 }
5870 }
5871
5872 protected virtual Expression ResolveArrayElement (ResolveContext ec, Expression element)
5873 {
5874 element = element.Resolve (ec);
5875 if (element == null)
5876 return null;
5877
5878 if (element is CompoundAssign.TargetExpression) {
5879 if (first_emit != null)
5880 throw new InternalErrorException ("Can only handle one mutator at a time");
5881 first_emit = element;
5882 element = first_emit_temp = new LocalTemporary (element.Type);
5883 }
5884
5885 return Convert.ImplicitConversionRequired (
5886 ec, element, array_element_type, loc);
5887 }
5888
5889 protected bool ResolveInitializers (ResolveContext ec)
5890 {
5891 if (arguments != null) {
5892 bool res = true;
5893 for (int i = 0; i < arguments.Count; ++i) {
5894 res &= CheckIndices (ec, initializers, i, true, dimensions);
5895 if (initializers != null)
5896 break;
5897 }
5898
5899 return res;
5900 }
5901
5902 arguments = new List<Expression> ();
5903
5904 if (!CheckIndices (ec, initializers, 0, false, dimensions))
5905 return false;
5906
5907 UpdateIndices ();
5908
5909 return true;
5910 }
5911
5912 //
5913 // Resolved the type of the array
5914 //
5915 bool ResolveArrayType (ResolveContext ec)
5916 {
5917 if (requested_base_type is VarExpr) {
5918 ec.Report.Error (820, loc, "An implicitly typed local variable declarator cannot use an array initializer");
5919 return false;
5920 }
5921
5922 StringBuilder array_qualifier = new StringBuilder ();
5923
5924 //
5925 // `In the first form allocates an array instace of the type that results
5926 // from deleting each of the individual expression from the expression list'
5927 //
5928 if (num_arguments > 0) {
5929 array_qualifier.Append ("[");
5930 for (int i = num_arguments-1; i > 0; i--)
5931 array_qualifier.Append (",");
5932 array_qualifier.Append ("]");
5933 }
5934
5935 array_qualifier.Append (rank);
5936
5937 //
5938 // Lookup the type
5939 //
5940 TypeExpr array_type_expr;
5941 array_type_expr = new ComposedCast (requested_base_type, array_qualifier.ToString (), loc);
5942 array_type_expr = array_type_expr.ResolveAsTypeTerminal (ec, false);
5943 if (array_type_expr == null)
5944 return false;
5945
5946 type = array_type_expr.Type;
5947 var ac = type as ArrayContainer;
5948 if (ac == null) {
5949 ec.Report.Error (622, loc, "Can only use array initializer expressions to assign to array types. Try using a new expression instead");
5950 return false;
5951 }
5952
5953 array_element_type = ac.Element;
5954 dimensions = ac.Rank;
5955
5956 return true;
5957 }
5958
5959 protected override Expression DoResolve (ResolveContext ec)
5960 {
5961 if (type != null)
5962 return this;
5963
5964 if (!ResolveArrayType (ec))
5965 return null;
5966
5967 //
5968 // validate the initializers and fill in any missing bits
5969 //
5970 if (!ResolveInitializers (ec))
5971 return null;
5972
5973 eclass = ExprClass.Value;
5974 return this;
5975 }
5976
5977 byte [] MakeByteBlob ()
5978 {
5979 int factor;
5980 byte [] data;
5981 byte [] element;
5982 int count = array_data.Count;
5983
5984 TypeSpec element_type = array_element_type;
5985 if (TypeManager.IsEnumType (element_type))
5986 element_type = EnumSpec.GetUnderlyingType (element_type);
5987
5988 factor = GetTypeSize (element_type);
5989 if (factor == 0)
5990 throw new Exception ("unrecognized type in MakeByteBlob: " + element_type);
5991
5992 data = new byte [(count * factor + 3) & ~3];
5993 int idx = 0;
5994
5995 for (int i = 0; i < count; ++i) {
5996 object v = array_data [i];
5997
5998 if (v is EnumConstant)
5999 v = ((EnumConstant) v).Child;
6000
6001 if (v is Constant && !(v is StringConstant))
6002 v = ((Constant) v).GetValue ();
6003 else {
6004 idx += factor;
6005 continue;
6006 }
6007
6008 if (element_type == TypeManager.int64_type){
6009 if (!(v is Expression)){
6010 long val = (long) v;
6011
6012 for (int j = 0; j < factor; ++j) {
6013 data [idx + j] = (byte) (val & 0xFF);
6014 val = (val >> 8);
6015 }
6016 }
6017 } else if (element_type == TypeManager.uint64_type){
6018 if (!(v is Expression)){
6019 ulong val = (ulong) v;
6020
6021 for (int j = 0; j < factor; ++j) {
6022 data [idx + j] = (byte) (val & 0xFF);
6023 val = (val >> 8);
6024 }
6025 }
6026 } else if (element_type == TypeManager.float_type) {
6027 if (!(v is Expression)){
6028 element = BitConverter.GetBytes ((float) v);
6029
6030 for (int j = 0; j < factor; ++j)
6031 data [idx + j] = element [j];
6032 if (!BitConverter.IsLittleEndian)
6033 System.Array.Reverse (data, idx, 4);
6034 }
6035 } else if (element_type == TypeManager.double_type) {
6036 if (!(v is Expression)){
6037 element = BitConverter.GetBytes ((double) v);
6038
6039 for (int j = 0; j < factor; ++j)
6040 data [idx + j] = element [j];
6041
6042 // FIXME: Handle the ARM float format.
6043 if (!BitConverter.IsLittleEndian)
6044 System.Array.Reverse (data, idx, 8);
6045 }
6046 } else if (element_type == TypeManager.char_type){
6047 if (!(v is Expression)){
6048 int val = (int) ((char) v);
6049
6050 data [idx] = (byte) (val & 0xff);
6051 data [idx+1] = (byte) (val >> 8);
6052 }
6053 } else if (element_type == TypeManager.short_type){
6054 if (!(v is Expression)){
6055 int val = (int) ((short) v);
6056
6057 data [idx] = (byte) (val & 0xff);
6058 data [idx+1] = (byte) (val >> 8);
6059 }
6060 } else if (element_type == TypeManager.ushort_type){
6061 if (!(v is Expression)){
6062 int val = (int) ((ushort) v);
6063
6064 data [idx] = (byte) (val & 0xff);
6065 data [idx+1] = (byte) (val >> 8);
6066 }
6067 } else if (element_type == TypeManager.int32_type) {
6068 if (!(v is Expression)){
6069 int val = (int) v;
6070
6071 data [idx] = (byte) (val & 0xff);
6072 data [idx+1] = (byte) ((val >> 8) & 0xff);
6073 data [idx+2] = (byte) ((val >> 16) & 0xff);
6074 data [idx+3] = (byte) (val >> 24);
6075 }
6076 } else if (element_type == TypeManager.uint32_type) {
6077 if (!(v is Expression)){
6078 uint val = (uint) v;
6079
6080 data [idx] = (byte) (val & 0xff);
6081 data [idx+1] = (byte) ((val >> 8) & 0xff);
6082 data [idx+2] = (byte) ((val >> 16) & 0xff);
6083 data [idx+3] = (byte) (val >> 24);
6084 }
6085 } else if (element_type == TypeManager.sbyte_type) {
6086 if (!(v is Expression)){
6087 sbyte val = (sbyte) v;
6088 data [idx] = (byte) val;
6089 }
6090 } else if (element_type == TypeManager.byte_type) {
6091 if (!(v is Expression)){
6092 byte val = (byte) v;
6093 data [idx] = (byte) val;
6094 }
6095 } else if (element_type == TypeManager.bool_type) {
6096 if (!(v is Expression)){
6097 bool val = (bool) v;
6098 data [idx] = (byte) (val ? 1 : 0);
6099 }
6100 } else if (element_type == TypeManager.decimal_type){
6101 if (!(v is Expression)){
6102 int [] bits = Decimal.GetBits ((decimal) v);
6103 int p = idx;
6104
6105 // FIXME: For some reason, this doesn't work on the MS runtime.
6106 int [] nbits = new int [4];
6107 nbits [0] = bits [3];
6108 nbits [1] = bits [2];
6109 nbits [2] = bits [0];
6110 nbits [3] = bits [1];
6111
6112 for (int j = 0; j < 4; j++){
6113 data [p++] = (byte) (nbits [j] & 0xff);
6114 data [p++] = (byte) ((nbits [j] >> 8) & 0xff);
6115 data [p++] = (byte) ((nbits [j] >> 16) & 0xff);
6116 data [p++] = (byte) (nbits [j] >> 24);
6117 }
6118 }
6119 } else {
6120 throw new Exception ("Unrecognized type in MakeByteBlob: " + element_type);
6121 }
6122
6123 idx += factor;
6124 }
6125
6126 return data;
6127 }
6128
6129 #if NET_4_0
6130 public override SLE.Expression MakeExpression (BuilderContext ctx)
6131 {
6132 var initializers = new SLE.Expression [array_data.Count];
6133 for (var i = 0; i < initializers.Length; i++) {
6134 if (array_data [i] == null)
6135 initializers [i] = SLE.Expression.Default (array_element_type.GetMetaInfo ());
6136 else
6137 initializers [i] = array_data [i].MakeExpression (ctx);
6138 }
6139
6140 return SLE.Expression.NewArrayInit (array_element_type.GetMetaInfo (), initializers);
6141 }
6142 #endif
6143 //
6144 // Emits the initializers for the array
6145 //
6146 void EmitStaticInitializers (EmitContext ec)
6147 {
6148 // FIXME: This should go to Resolve !
6149 if (TypeManager.void_initializearray_array_fieldhandle == null) {
6150 TypeManager.void_initializearray_array_fieldhandle = TypeManager.GetPredefinedMethod (
6151 TypeManager.runtime_helpers_type, "InitializeArray", loc,
6152 TypeManager.array_type, TypeManager.runtime_field_handle_type);
6153 if (TypeManager.void_initializearray_array_fieldhandle == null)
6154 return;
6155 }
6156
6157 //
6158 // First, the static data
6159 //
6160 FieldBuilder fb;
6161
6162 byte [] data = MakeByteBlob ();
6163
6164 fb = RootContext.MakeStaticData (data);
6165
6166 ec.Emit (OpCodes.Dup);
6167 ec.Emit (OpCodes.Ldtoken, fb);
6168 ec.Emit (OpCodes.Call, TypeManager.void_initializearray_array_fieldhandle);
6169 }
6170
6171 //
6172 // Emits pieces of the array that can not be computed at compile
6173 // time (variables and string locations).
6174 //
6175 // This always expect the top value on the stack to be the array
6176 //
6177 void EmitDynamicInitializers (EmitContext ec, bool emitConstants)
6178 {
6179 int dims = bounds.Count;
6180 var current_pos = new int [dims];
6181
6182 for (int i = 0; i < array_data.Count; i++){
6183
6184 Expression e = array_data [i];
6185 var c = e as Constant;
6186
6187 // Constant can be initialized via StaticInitializer
6188 if (c == null || (c != null && emitConstants && !c.IsDefaultInitializer (array_element_type))) {
6189 TypeSpec etype = e.Type;
6190
6191 ec.Emit (OpCodes.Dup);
6192
6193 for (int idx = 0; idx < dims; idx++)
6194 ec.EmitInt (current_pos [idx]);
6195
6196 //
6197 // If we are dealing with a struct, get the
6198 // address of it, so we can store it.
6199 //
6200 if ((dims == 1) && TypeManager.IsStruct (etype) &&
6201 (!TypeManager.IsBuiltinOrEnum (etype) ||
6202 etype == TypeManager.decimal_type)) {
6203
6204 ec.Emit (OpCodes.Ldelema, etype);
6205 }
6206
6207 e.Emit (ec);
6208
6209 ec.EmitArrayStore ((ArrayContainer) type);
6210 }
6211
6212 //
6213 // Advance counter
6214 //
6215 for (int j = dims - 1; j >= 0; j--){
6216 current_pos [j]++;
6217 if (current_pos [j] < bounds [j])
6218 break;
6219 current_pos [j] = 0;
6220 }
6221 }
6222 }
6223
6224 public override void Emit (EmitContext ec)
6225 {
6226 if (first_emit != null) {
6227 first_emit.Emit (ec);
6228 first_emit_temp.Store (ec);
6229 }
6230
6231 foreach (Expression e in arguments)
6232 e.Emit (ec);
6233
6234 ec.EmitArrayNew ((ArrayContainer) type);
6235
6236 if (initializers == null)
6237 return;
6238
6239 // Emit static initializer for arrays which have contain more than 2 items and
6240 // the static initializer will initialize at least 25% of array values.
6241 // NOTE: const_initializers_count does not contain default constant values.
6242 if (const_initializers_count > 2 && const_initializers_count * 4 > (array_data.Count) &&
6243 (TypeManager.IsPrimitiveType (array_element_type) || TypeManager.IsEnumType (array_element_type))) {
6244 EmitStaticInitializers (ec);
6245
6246 if (!only_constant_initializers)
6247 EmitDynamicInitializers (ec, false);
6248 } else {
6249 EmitDynamicInitializers (ec, true);
6250 }
6251
6252 if (first_emit_temp != null)
6253 first_emit_temp.Release (ec);
6254 }
6255
6256 public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
6257 {
6258 // no multi dimensional or jagged arrays
6259 if (arguments.Count != 1 || array_element_type.IsArray) {
6260 base.EncodeAttributeValue (rc, enc, targetType);
6261 return;
6262 }
6263
6264 // No array covariance, except for array -> object
6265 if (type != targetType) {
6266 if (targetType != TypeManager.object_type) {
6267 base.EncodeAttributeValue (rc, enc, targetType);
6268 return;
6269 }
6270
6271 enc.Encode (type);
6272 }
6273
6274 // Single dimensional array of 0 size
6275 if (array_data == null) {
6276 IntConstant ic = arguments[0] as IntConstant;
6277 if (ic == null || !ic.IsDefaultValue) {
6278 base.EncodeAttributeValue (rc, enc, targetType);
6279 } else {
6280 enc.Stream.Write (0);
6281 }
6282
6283 return;
6284 }
6285
6286 enc.Stream.Write ((int) array_data.Count);
6287 foreach (var element in array_data) {
6288 element.EncodeAttributeValue (rc, enc, array_element_type);
6289 }
6290 }
6291
6292 protected override void CloneTo (CloneContext clonectx, Expression t)
6293 {
6294 ArrayCreation target = (ArrayCreation) t;
6295
6296 if (requested_base_type != null)
6297 target.requested_base_type = (FullNamedExpression)requested_base_type.Clone (clonectx);
6298
6299 if (arguments != null){
6300 target.arguments = new List<Expression> (arguments.Count);
6301 foreach (Expression e in arguments)
6302 target.arguments.Add (e.Clone (clonectx));
6303 }
6304
6305 if (initializers != null)
6306 target.initializers = (ArrayInitializer) initializers.Clone (clonectx);
6307 }
6308 }
6309
6310 //
6311 // Represents an implicitly typed array epxression
6312 //
6313 class ImplicitlyTypedArrayCreation : ArrayCreation
6314 {
6315 public ImplicitlyTypedArrayCreation (string rank, ArrayInitializer initializers, Location loc)
6316 : base (null, rank, initializers, loc)
6317 {
6318 if (rank.Length > 2) {
6319 while (rank [++dimensions] == ',');
6320 } else {
6321 dimensions = 1;
6322 }
6323 }
6324
6325 protected override Expression DoResolve (ResolveContext ec)
6326 {
6327 if (type != null)
6328 return this;
6329
6330 if (!ResolveInitializers (ec))
6331 return null;
6332
6333 if (array_element_type == null || array_element_type == TypeManager.null_type ||
6334 array_element_type == TypeManager.void_type || array_element_type == InternalType.AnonymousMethod ||
6335 array_element_type == InternalType.MethodGroup ||
6336 arguments.Count != dimensions) {
6337 Error_NoBestType (ec);
6338 return null;
6339 }
6340
6341 //
6342 // At this point we found common base type for all initializer elements
6343 // but we have to be sure that all static initializer elements are of
6344 // same type
6345 //
6346 UnifyInitializerElement (ec);
6347
6348 type = TypeManager.GetConstructedType (array_element_type, rank);
6349 eclass = ExprClass.Value;
6350 return this;
6351 }
6352
6353 void Error_NoBestType (ResolveContext ec)
6354 {
6355 ec.Report.Error (826, loc,
6356 "The type of an implicitly typed array cannot be inferred from the initializer. Try specifying array type explicitly");
6357 }
6358
6359 //
6360 // Converts static initializer only
6361 //
6362 void UnifyInitializerElement (ResolveContext ec)
6363 {
6364 for (int i = 0; i < array_data.Count; ++i) {
6365 Expression e = (Expression)array_data[i];
6366 if (e != null)
6367 array_data [i] = Convert.ImplicitConversion (ec, e, array_element_type, Location.Null);
6368 }
6369 }
6370
6371 protected override Expression ResolveArrayElement (ResolveContext ec, Expression element)
6372 {
6373 element = element.Resolve (ec);
6374 if (element == null)
6375 return null;
6376
6377 if (array_element_type == null) {
6378 if (element.Type != TypeManager.null_type)
6379 array_element_type = element.Type;
6380
6381 return element;
6382 }
6383
6384 if (Convert.ImplicitConversionExists (ec, element, array_element_type)) {
6385 return element;
6386 }
6387
6388 if (Convert.ImplicitConversionExists (ec, new TypeExpression (array_element_type, loc), element.Type)) {
6389 array_element_type = element.Type;
6390 return element;
6391 }
6392
6393 Error_NoBestType (ec);
6394 return null;
6395 }
6396 }
6397
6398 public sealed class CompilerGeneratedThis : This
6399 {
6400 public static This Instance = new CompilerGeneratedThis ();
6401
6402 private CompilerGeneratedThis ()
6403 : base (Location.Null)
6404 {
6405 }
6406
6407 public CompilerGeneratedThis (TypeSpec type, Location loc)
6408 : base (loc)
6409 {
6410 this.type = type;
6411 }
6412
6413 protected override Expression DoResolve (ResolveContext ec)
6414 {
6415 eclass = ExprClass.Variable;
6416 if (type == null)
6417 type = ec.CurrentType;
6418
6419 return this;
6420 }
6421
6422 public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
6423 {
6424 return null;
6425 }
6426 }
6427
6428 /// <summary>
6429 /// Represents the `this' construct
6430 /// </summary>
6431
6432 public class This : VariableReference
6433 {
6434 sealed class ThisVariable : ILocalVariable
6435 {
6436 public static readonly ILocalVariable Instance = new ThisVariable ();
6437
6438 public void Emit (EmitContext ec)
6439 {
6440 ec.Emit (OpCodes.Ldarg_0);
6441 }
6442
6443 public void EmitAssign (EmitContext ec)
6444 {
6445 throw new InvalidOperationException ();
6446 }
6447
6448 public void EmitAddressOf (EmitContext ec)
6449 {
6450 ec.Emit (OpCodes.Ldarg_0);
6451 }
6452 }
6453
6454 VariableInfo variable_info;
6455
6456 public This (Location loc)
6457 {
6458 this.loc = loc;
6459 }
6460
6461 public override VariableInfo VariableInfo {
6462 get { return variable_info; }
6463 }
6464
6465 public override bool IsFixed {
6466 get { return false; }
6467 }
6468
6469 public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
6470 {
6471 if (ae == null)
6472 return null;
6473
6474 AnonymousMethodStorey storey = ae.Storey;
6475 while (storey != null) {
6476 AnonymousMethodStorey temp = storey.Parent as AnonymousMethodStorey;
6477 if (temp == null)
6478 return storey.HoistedThis;
6479
6480 storey = temp;
6481 }
6482
6483 return null;
6484 }
6485
6486 public override bool IsRef {
6487 get { return type.IsStruct; }
6488 }
6489
6490 protected override ILocalVariable Variable {
6491 get { return ThisVariable.Instance; }
6492 }
6493
6494 public static bool IsThisAvailable (ResolveContext ec, bool ignoreAnonymous)
6495 {
6496 if (ec.IsStatic || ec.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.BaseInitializer | ResolveContext.Options.ConstantScope))
6497 return false;
6498
6499 if (ignoreAnonymous || ec.CurrentAnonymousMethod == null)
6500 return true;
6501
6502 if (TypeManager.IsStruct (ec.CurrentType) && ec.CurrentIterator == null)
6503 return false;
6504
6505 return true;
6506 }
6507
6508 public bool ResolveBase (ResolveContext ec)
6509 {
6510 eclass = ExprClass.Variable;
6511 type = ec.CurrentType;
6512
6513 if (!IsThisAvailable (ec, false)) {
6514 if (ec.IsStatic && !ec.HasSet (ResolveContext.Options.ConstantScope)) {
6515 ec.Report.Error (26, loc, "Keyword `this' is not valid in a static property, static method, or static field initializer");
6516 } else if (ec.CurrentAnonymousMethod != null) {
6517 ec.Report.Error (1673, loc,
6518 "Anonymous methods inside structs cannot access instance members of `this'. " +
6519 "Consider copying `this' to a local variable outside the anonymous method and using the local instead");
6520 } else {
6521 ec.Report.Error (27, loc, "Keyword `this' is not available in the current context");
6522 }
6523 }
6524
6525 var block = ec.CurrentBlock;
6526 if (block != null) {
6527 if (block.Toplevel.ThisVariable != null)
6528 variable_info = block.Toplevel.ThisVariable.VariableInfo;
6529
6530 AnonymousExpression am = ec.CurrentAnonymousMethod;
6531 if (am != null && ec.IsVariableCapturingRequired) {
6532 am.SetHasThisAccess ();
6533 }
6534 }
6535
6536 return true;
6537 }
6538
6539 //
6540 // Called from Invocation to check if the invocation is correct
6541 //
6542 public override void CheckMarshalByRefAccess (ResolveContext ec)
6543 {
6544 if ((variable_info != null) && !(TypeManager.IsStruct (type) && ec.OmitStructFlowAnalysis) &&
6545 !variable_info.IsAssigned (ec)) {
6546 ec.Report.Error (188, loc,
6547 "The `this' object cannot be used before all of its fields are assigned to");
6548 variable_info.SetAssigned (ec);
6549 }
6550 }
6551
6552 public override Expression CreateExpressionTree (ResolveContext ec)
6553 {
6554 Arguments args = new Arguments (1);
6555 args.Add (new Argument (this));
6556
6557 // Use typeless constant for ldarg.0 to save some
6558 // space and avoid problems with anonymous stories
6559 return CreateExpressionFactoryCall (ec, "Constant", args);
6560 }
6561
6562 protected override Expression DoResolve (ResolveContext ec)
6563 {
6564 ResolveBase (ec);
6565 return this;
6566 }
6567
6568 override public Expression DoResolveLValue (ResolveContext ec, Expression right_side)
6569 {
6570 if (!ResolveBase (ec))
6571 return null;
6572
6573 if (variable_info != null)
6574 variable_info.SetAssigned (ec);
6575
6576 if (ec.CurrentType.IsClass){
6577 if (right_side == EmptyExpression.UnaryAddress)
6578 ec.Report.Error (459, loc, "Cannot take the address of `this' because it is read-only");
6579 else if (right_side == EmptyExpression.OutAccess.Instance)
6580 ec.Report.Error (1605, loc, "Cannot pass `this' as a ref or out argument because it is read-only");
6581 else
6582 ec.Report.Error (1604, loc, "Cannot assign to `this' because it is read-only");
6583 }
6584
6585 return this;
6586 }
6587
6588 public override int GetHashCode()
6589 {
6590 throw new NotImplementedException ();
6591 }
6592
6593 public override string Name {
6594 get { return "this"; }
6595 }
6596
6597 public override bool Equals (object obj)
6598 {
6599 This t = obj as This;
6600 if (t == null)
6601 return false;
6602
6603 return true;
6604 }
6605
6606 protected override void CloneTo (CloneContext clonectx, Expression t)
6607 {
6608 // Nothing
6609 }
6610
6611 public override void SetHasAddressTaken ()
6612 {
6613 // Nothing
6614 }
6615 }
6616
6617 /// <summary>
6618 /// Represents the `__arglist' construct
6619 /// </summary>
6620 public class ArglistAccess : Expression
6621 {
6622 public ArglistAccess (Location loc)
6623 {
6624 this.loc = loc;
6625 }
6626
6627 public override Expression CreateExpressionTree (ResolveContext ec)
6628 {
6629 throw new NotSupportedException ("ET");
6630 }
6631
6632 protected override Expression DoResolve (ResolveContext ec)
6633 {
6634 eclass = ExprClass.Variable;
6635 type = TypeManager.runtime_argument_handle_type;
6636
6637 if (ec.HasSet (ResolveContext.Options.FieldInitializerScope) || !ec.CurrentBlock.Toplevel.Parameters.HasArglist) {
6638 ec.Report.Error (190, loc,
6639 "The __arglist construct is valid only within a variable argument method");
6640 }
6641
6642 return this;
6643 }
6644
6645 public override void Emit (EmitContext ec)
6646 {
6647 ec.Emit (OpCodes.Arglist);
6648 }
6649
6650 protected override void CloneTo (CloneContext clonectx, Expression target)
6651 {
6652 // nothing.
6653 }
6654 }
6655
6656 /// <summary>
6657 /// Represents the `__arglist (....)' construct
6658 /// </summary>
6659 public class Arglist : Expression
6660 {
6661 Arguments Arguments;
6662
6663 public Arglist (Location loc)
6664 : this (null, loc)
6665 {
6666 }
6667
6668 public Arglist (Arguments args, Location l)
6669 {
6670 Arguments = args;
6671 loc = l;
6672 }
6673
6674 public Type[] ArgumentTypes {
6675 get {
6676 if (Arguments == null)
6677 return System.Type.EmptyTypes;
6678
6679 var retval = new Type [Arguments.Count];
6680 for (int i = 0; i < retval.Length; i++)
6681 retval[i] = Arguments[i].Expr.Type.GetMetaInfo ();
6682
6683 return retval;
6684 }
6685 }
6686
6687 public override Expression CreateExpressionTree (ResolveContext ec)
6688 {
6689 ec.Report.Error (1952, loc, "An expression tree cannot contain a method with variable arguments");
6690 return null;
6691 }
6692
6693 protected override Expression DoResolve (ResolveContext ec)
6694 {
6695 eclass = ExprClass.Variable;
6696 type = InternalType.Arglist;
6697 if (Arguments != null) {
6698 bool dynamic; // Can be ignored as there is always only 1 overload
6699 Arguments.Resolve (ec, out dynamic);
6700 }
6701
6702 return this;
6703 }
6704
6705 public override void Emit (EmitContext ec)
6706 {
6707 if (Arguments != null)
6708 Arguments.Emit (ec);
6709 }
6710
6711 protected override void CloneTo (CloneContext clonectx, Expression t)
6712 {
6713 Arglist target = (Arglist) t;
6714
6715 if (Arguments != null)
6716 target.Arguments = Arguments.Clone (clonectx);
6717 }
6718 }
6719
6720 /// <summary>
6721 /// Implements the typeof operator
6722 /// </summary>
6723 public class TypeOf : Expression {
6724 Expression QueriedType;
6725 protected TypeSpec typearg;
6726
6727 public TypeOf (Expression queried_type, Location l)
6728 {
6729 QueriedType = queried_type;
6730 loc = l;
6731 }
6732
6733 public override Expression CreateExpressionTree (ResolveContext ec)
6734 {
6735 Arguments args = new Arguments (2);
6736 args.Add (new Argument (this));
6737 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
6738 return CreateExpressionFactoryCall (ec, "Constant", args);
6739 }
6740
6741 protected override Expression DoResolve (ResolveContext ec)
6742 {
6743 TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
6744 if (texpr == null)
6745 return null;
6746
6747 typearg = texpr.Type;
6748
6749 //
6750 // Get generic type definition for unbounded type arguments
6751 //
6752 var tne = QueriedType as ATypeNameExpression;
6753 if (tne != null && typearg.IsGeneric && !tne.HasTypeArguments)
6754 typearg = typearg.GetDefinition ();
6755
6756 if (typearg == TypeManager.void_type) {
6757 ec.Report.Error (673, loc, "System.Void cannot be used from C#. Use typeof (void) to get the void type object");
6758 } else if (typearg.IsPointer && !ec.IsUnsafe){
6759 UnsafeError (ec, loc);
6760 } else if (texpr is DynamicTypeExpr) {
6761 ec.Report.Error (1962, QueriedType.Location,
6762 "The typeof operator cannot be used on the dynamic type");
6763 }
6764
6765 type = TypeManager.type_type;
6766
6767 return DoResolveBase ();
6768 }
6769
6770 protected Expression DoResolveBase ()
6771 {
6772 if (TypeManager.system_type_get_type_from_handle == null) {
6773 TypeManager.system_type_get_type_from_handle = TypeManager.GetPredefinedMethod (
6774 TypeManager.type_type, "GetTypeFromHandle", loc, TypeManager.runtime_handle_type);
6775 }
6776
6777 // Even though what is returned is a type object, it's treated as a value by the compiler.
6778 // In particular, 'typeof (Foo).X' is something totally different from 'Foo.X'.
6779 eclass = ExprClass.Value;
6780 return this;
6781 }
6782
6783 public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
6784 {
6785 // Target type is not System.Type therefore must be object
6786 // and we need to use different encoding sequence
6787 if (targetType != type)
6788 enc.Encode (type);
6789
6790 /*
6791 var gi = typearg as InflatedTypeSpec;
6792 if (gi != null) {
6793 // TODO: This has to be recursive, handle arrays, etc.
6794 // I could probably do it after CustomAttribute encoder rewrite
6795 foreach (var ta in gi.TypeArguments) {
6796 if (ta.IsGenericParameter) {
6797 ec.Report.SymbolRelatedToPreviousError (typearg);
6798 ec.Report.Error (416, loc, "`{0}': an attribute argument cannot use type parameters",
6799 TypeManager.CSharpName (typearg));
6800 value = null;
6801 return false;
6802 }
6803 }
6804 }
6805 */
6806
6807 if (!enc.EncodeTypeName (typearg)) {
6808 rc.Compiler.Report.SymbolRelatedToPreviousError (typearg);
6809 rc.Compiler.Report.Error (416, loc, "`{0}': an attribute argument cannot use type parameters",
6810 TypeManager.CSharpName (typearg));
6811 }
6812 }
6813
6814 public override void Emit (EmitContext ec)
6815 {
6816 ec.Emit (OpCodes.Ldtoken, typearg);
6817 ec.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
6818 }
6819
6820 public TypeSpec TypeArgument {
6821 get {
6822 return typearg;
6823 }
6824 }
6825
6826 protected override void CloneTo (CloneContext clonectx, Expression t)
6827 {
6828 TypeOf target = (TypeOf) t;
6829 if (QueriedType != null)
6830 target.QueriedType = QueriedType.Clone (clonectx);
6831 }
6832 }
6833
6834 /// <summary>
6835 /// Implements the `typeof (void)' operator
6836 /// </summary>
6837 public class TypeOfVoid : TypeOf {
6838 public TypeOfVoid (Location l) : base (null, l)
6839 {
6840 loc = l;
6841 }
6842
6843 protected override Expression DoResolve (ResolveContext ec)
6844 {
6845 type = TypeManager.type_type;
6846 typearg = TypeManager.void_type;
6847
6848 return DoResolveBase ();
6849 }
6850 }
6851
6852 class TypeOfMethod : TypeOfMember<MethodSpec>
6853 {
6854 public TypeOfMethod (MethodSpec method, Location loc)
6855 : base (method, loc)
6856 {
6857 }
6858
6859 protected override Expression DoResolve (ResolveContext ec)
6860 {
6861 if (member.IsConstructor) {
6862 type = TypeManager.ctorinfo_type;
6863 if (type == null)
6864 type = TypeManager.ctorinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", "ConstructorInfo", MemberKind.Class, true);
6865 } else {
6866 type = TypeManager.methodinfo_type;
6867 if (type == null)
6868 type = TypeManager.methodinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", "MethodInfo", MemberKind.Class, true);
6869 }
6870
6871 return base.DoResolve (ec);
6872 }
6873
6874 public override void Emit (EmitContext ec)
6875 {
6876 ec.Emit (OpCodes.Ldtoken, member);
6877
6878 base.Emit (ec);
6879 ec.Emit (OpCodes.Castclass, type);
6880 }
6881
6882 protected override string GetMethodName {
6883 get { return "GetMethodFromHandle"; }
6884 }
6885
6886 protected override string RuntimeHandleName {
6887 get { return "RuntimeMethodHandle"; }
6888 }
6889
6890 protected override MethodSpec TypeFromHandle {
6891 get {
6892 return TypeManager.methodbase_get_type_from_handle;
6893 }
6894 set {
6895 TypeManager.methodbase_get_type_from_handle = value;
6896 }
6897 }
6898
6899 protected override MethodSpec TypeFromHandleGeneric {
6900 get {
6901 return TypeManager.methodbase_get_type_from_handle_generic;
6902 }
6903 set {
6904 TypeManager.methodbase_get_type_from_handle_generic = value;
6905 }
6906 }
6907
6908 protected override string TypeName {
6909 get { return "MethodBase"; }
6910 }
6911 }
6912
6913 abstract class TypeOfMember<T> : Expression where T : MemberSpec
6914 {
6915 protected readonly T member;
6916
6917 protected TypeOfMember (T member, Location loc)
6918 {
6919 this.member = member;
6920 this.loc = loc;
6921 }
6922
6923 public override Expression CreateExpressionTree (ResolveContext ec)
6924 {
6925 Arguments args = new Arguments (2);
6926 args.Add (new Argument (this));
6927 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
6928 return CreateExpressionFactoryCall (ec, "Constant", args);
6929 }
6930
6931 protected override Expression DoResolve (ResolveContext ec)
6932 {
6933 bool is_generic = member.DeclaringType.IsGenericOrParentIsGeneric;
6934 var mi = is_generic ? TypeFromHandleGeneric : TypeFromHandle;
6935
6936 if (mi == null) {
6937 TypeSpec t = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", TypeName, MemberKind.Class, true);
6938 TypeSpec handle_type = TypeManager.CoreLookupType (ec.Compiler, "System", RuntimeHandleName, MemberKind.Struct, true);
6939
6940 if (t == null || handle_type == null)
6941 return null;
6942
6943 mi = TypeManager.GetPredefinedMethod (t, GetMethodName, loc,
6944 is_generic ?
6945 new TypeSpec[] { handle_type, TypeManager.runtime_handle_type } :
6946 new TypeSpec[] { handle_type } );
6947
6948 if (is_generic)
6949 TypeFromHandleGeneric = mi;
6950 else
6951 TypeFromHandle = mi;
6952 }
6953
6954 eclass = ExprClass.Value;
6955 return this;
6956 }
6957
6958 public override void Emit (EmitContext ec)
6959 {
6960 bool is_generic = member.DeclaringType.IsGenericOrParentIsGeneric;
6961 MethodSpec mi;
6962 if (is_generic) {
6963 mi = TypeFromHandleGeneric;
6964 ec.Emit (OpCodes.Ldtoken, member.DeclaringType);
6965 } else {
6966 mi = TypeFromHandle;
6967 }
6968
6969 ec.Emit (OpCodes.Call, mi);
6970 }
6971
6972 protected abstract string GetMethodName { get; }
6973 protected abstract string RuntimeHandleName { get; }
6974 protected abstract MethodSpec TypeFromHandle { get; set; }
6975 protected abstract MethodSpec TypeFromHandleGeneric { get; set; }
6976 protected abstract string TypeName { get; }
6977 }
6978
6979 class TypeOfField : TypeOfMember<FieldSpec>
6980 {
6981 public TypeOfField (FieldSpec field, Location loc)
6982 : base (field, loc)
6983 {
6984 }
6985
6986 protected override Expression DoResolve (ResolveContext ec)
6987 {
6988 if (TypeManager.fieldinfo_type == null)
6989 TypeManager.fieldinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", TypeName, MemberKind.Class, true);
6990
6991 type = TypeManager.fieldinfo_type;
6992 return base.DoResolve (ec);
6993 }
6994
6995 public override void Emit (EmitContext ec)
6996 {
6997 ec.Emit (OpCodes.Ldtoken, member);
6998 base.Emit (ec);
6999 }
7000
7001 protected override string GetMethodName {
7002 get { return "GetFieldFromHandle"; }
7003 }
7004
7005 protected override string RuntimeHandleName {
7006 get { return "RuntimeFieldHandle"; }
7007 }
7008
7009 protected override MethodSpec TypeFromHandle {
7010 get {
7011 return TypeManager.fieldinfo_get_field_from_handle;
7012 }
7013 set {
7014 TypeManager.fieldinfo_get_field_from_handle = value;
7015 }
7016 }
7017
7018 protected override MethodSpec TypeFromHandleGeneric {
7019 get {
7020 return TypeManager.fieldinfo_get_field_from_handle_generic;
7021 }
7022 set {
7023 TypeManager.fieldinfo_get_field_from_handle_generic = value;
7024 }
7025 }
7026
7027 protected override string TypeName {
7028 get { return "FieldInfo"; }
7029 }
7030 }
7031
7032 /// <summary>
7033 /// Implements the sizeof expression
7034 /// </summary>
7035 public class SizeOf : Expression {
7036 readonly Expression QueriedType;
7037 TypeSpec type_queried;
7038
7039 public SizeOf (Expression queried_type, Location l)
7040 {
7041 this.QueriedType = queried_type;
7042 loc = l;
7043 }
7044
7045 public override Expression CreateExpressionTree (ResolveContext ec)
7046 {
7047 Error_PointerInsideExpressionTree (ec);
7048 return null;
7049 }
7050
7051 protected override Expression DoResolve (ResolveContext ec)
7052 {
7053 TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
7054 if (texpr == null)
7055 return null;
7056
7057 type_queried = texpr.Type;
7058 if (TypeManager.IsEnumType (type_queried))
7059 type_queried = EnumSpec.GetUnderlyingType (type_queried);
7060
7061 int size_of = GetTypeSize (type_queried);
7062 if (size_of > 0) {
7063 return new IntConstant (size_of, loc).Resolve (ec);
7064 }
7065
7066 if (!TypeManager.VerifyUnmanaged (ec.Compiler, type_queried, loc)){
7067 return null;
7068 }
7069
7070 if (!ec.IsUnsafe) {
7071 ec.Report.Error (233, loc,
7072 "`{0}' does not have a predefined size, therefore sizeof can only be used in an unsafe context (consider using System.Runtime.InteropServices.Marshal.SizeOf)",
7073 TypeManager.CSharpName (type_queried));
7074 }
7075
7076 type = TypeManager.int32_type;
7077 eclass = ExprClass.Value;
7078 return this;
7079 }
7080
7081 public override void Emit (EmitContext ec)
7082 {
7083 ec.Emit (OpCodes.Sizeof, type_queried);
7084 }
7085
7086 protected override void CloneTo (CloneContext clonectx, Expression t)
7087 {
7088 }
7089 }
7090
7091 /// <summary>
7092 /// Implements the qualified-alias-member (::) expression.
7093 /// </summary>
7094 public class QualifiedAliasMember : MemberAccess
7095 {
7096 readonly string alias;
7097 public static readonly string GlobalAlias = "global";
7098
7099 public QualifiedAliasMember (string alias, string identifier, Location l)
7100 : base (null, identifier, l)
7101 {
7102 this.alias = alias;
7103 }
7104
7105 public QualifiedAliasMember (string alias, string identifier, TypeArguments targs, Location l)
7106 : base (null, identifier, targs, l)
7107 {
7108 this.alias = alias;
7109 }
7110
7111 public QualifiedAliasMember (string alias, string identifier, int arity, Location l)
7112 : base (null, identifier, arity, l)
7113 {
7114 this.alias = alias;
7115 }
7116
7117 public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
7118 {
7119 if (alias == GlobalAlias) {
7120 expr = GlobalRootNamespace.Instance;
7121 return base.ResolveAsTypeStep (ec, silent);
7122 }
7123
7124 int errors = ec.Compiler.Report.Errors;
7125 expr = ec.LookupNamespaceAlias (alias);
7126 if (expr == null) {
7127 if (errors == ec.Compiler.Report.Errors)
7128 ec.Compiler.Report.Error (432, loc, "Alias `{0}' not found", alias);
7129 return null;
7130 }
7131
7132 FullNamedExpression fne = base.ResolveAsTypeStep (ec, silent);
7133 if (fne == null)
7134 return null;
7135
7136 if (expr.eclass == ExprClass.Type) {
7137 if (!silent) {
7138 ec.Compiler.Report.Error (431, loc,
7139 "Alias `{0}' cannot be used with '::' since it denotes a type. Consider replacing '::' with '.'", alias);
7140 }
7141 return null;
7142 }
7143
7144 return fne;
7145 }
7146
7147 protected override Expression DoResolve (ResolveContext ec)
7148 {
7149 return ResolveAsTypeStep (ec, false);
7150 }
7151
7152 protected override void Error_IdentifierNotFound (IMemberContext rc, TypeSpec expr_type, string identifier)
7153 {
7154 rc.Compiler.Report.Error (687, loc,
7155 "A namespace alias qualifier `{0}' did not resolve to a namespace or a type",
7156 GetSignatureForError ());
7157 }
7158
7159 public override string GetSignatureForError ()
7160 {
7161 string name = Name;
7162 if (targs != null) {
7163 name = Name + "<" + targs.GetSignatureForError () + ">";
7164 }
7165
7166 return alias + "::" + name;
7167 }
7168
7169 protected override void CloneTo (CloneContext clonectx, Expression t)
7170 {
7171 // Nothing
7172 }
7173 }
7174
7175 /// <summary>
7176 /// Implements the member access expression
7177 /// </summary>
7178 public class MemberAccess : ATypeNameExpression {
7179 protected Expression expr;
7180
7181 public MemberAccess (Expression expr, string id)
7182 : base (id, expr.Location)
7183 {
7184 this.expr = expr;
7185 }
7186
7187 public MemberAccess (Expression expr, string identifier, Location loc)
7188 : base (identifier, loc)
7189 {
7190 this.expr = expr;
7191 }
7192
7193 public MemberAccess (Expression expr, string identifier, TypeArguments args, Location loc)
7194 : base (identifier, args, loc)
7195 {
7196 this.expr = expr;
7197 }
7198
7199 public MemberAccess (Expression expr, string identifier, int arity, Location loc)
7200 : base (identifier, arity, loc)
7201 {
7202 this.expr = expr;
7203 }
7204
7205 Expression DoResolve (ResolveContext ec, Expression right_side)
7206 {
7207 if (type != null)
7208 throw new Exception ();
7209
7210 //
7211 // Resolve the expression with flow analysis turned off, we'll do the definite
7212 // assignment checks later. This is because we don't know yet what the expression
7213 // will resolve to - it may resolve to a FieldExpr and in this case we must do the
7214 // definite assignment check on the actual field and not on the whole struct.
7215 //
7216
7217 SimpleName original = expr as SimpleName;
7218 Expression expr_resolved;
7219 const ResolveFlags flags = ResolveFlags.VariableOrValue | ResolveFlags.Type;
7220
7221 using (ec.Set (ResolveContext.Options.OmitStructFlowAnalysis)) {
7222 if (original != null) {
7223 expr_resolved = original.DoResolve (ec, true);
7224 if (expr_resolved != null) {
7225 // Ugly, simulate skipped Resolve
7226 if (expr_resolved is ConstantExpr) {
7227 expr_resolved = expr_resolved.Resolve (ec);
7228 } else if (expr_resolved is FieldExpr || expr_resolved is PropertyExpr) {
7229 // nothing yet
7230 } else if ((flags & expr_resolved.ExprClassToResolveFlags) == 0) {
7231 expr_resolved.Error_UnexpectedKind (ec, flags, expr.Location);
7232 expr_resolved = null;
7233 }
7234 }
7235 } else {
7236 expr_resolved = expr.Resolve (ec, flags);
7237 }
7238 }
7239
7240 if (expr_resolved == null)
7241 return null;
7242
7243 Namespace ns = expr_resolved as Namespace;
7244 if (ns != null) {
7245 FullNamedExpression retval = ns.Lookup (ec.Compiler, Name, Arity, loc);
7246
7247 if (retval == null)
7248 ns.Error_NamespaceDoesNotExist (loc, Name, Arity, ec);
7249 else if (HasTypeArguments)
7250 retval = new GenericTypeExpr (retval.Type, targs, loc).ResolveAsTypeStep (ec, false);
7251
7252 return retval;
7253 }
7254
7255 TypeSpec expr_type = expr_resolved.Type;
7256 if (expr_type == InternalType.Dynamic) {
7257 Arguments args = new Arguments (1);
7258 args.Add (new Argument (expr_resolved.Resolve (ec)));
7259 expr = new DynamicMemberBinder (Name, args, loc);
7260 if (right_side != null)
7261 return expr.DoResolveLValue (ec, right_side);
7262
7263 return expr.Resolve (ec);
7264 }
7265
7266 const MemberKind dot_kinds = MemberKind.Class | MemberKind.Struct | MemberKind.Delegate | MemberKind.Enum | MemberKind.Interface | MemberKind.TypeParameter;
7267 if ((expr_type.Kind & dot_kinds) == 0 || expr_type == TypeManager.void_type) {
7268 Unary.Error_OperatorCannotBeApplied (ec, loc, ".", expr_type);
7269 return null;
7270 }
7271
7272 var arity = HasTypeArguments ? targs.Count : -1;
7273
7274 var member_lookup = MemberLookup (ec.Compiler,
7275 ec.CurrentType, expr_type, expr_type, Name, arity, BindingRestriction.NoOverrides, loc);
7276
7277 if (member_lookup == null) {
7278 expr = expr_resolved.Resolve (ec);
7279
7280 ExprClass expr_eclass = expr.eclass;
7281
7282 //
7283 // Extension methods are not allowed on all expression types
7284 //
7285 if (expr_eclass == ExprClass.Value || expr_eclass == ExprClass.Variable ||
7286 expr_eclass == ExprClass.IndexerAccess || expr_eclass == ExprClass.PropertyAccess ||
7287 expr_eclass == ExprClass.EventAccess) {
7288 ExtensionMethodGroupExpr ex_method_lookup = ec.LookupExtensionMethod (expr_type, Name, arity, loc);
7289 if (ex_method_lookup != null) {
7290 ex_method_lookup.ExtensionExpression = expr;
7291
7292 if (HasTypeArguments) {
7293 if (!targs.Resolve (ec))
7294 return null;
7295
7296 ex_method_lookup.SetTypeArguments (ec, targs);
7297 }
7298
7299 return ex_method_lookup.Resolve (ec);
7300 }
7301 }
7302
7303 member_lookup = Error_MemberLookupFailed (ec,
7304 ec.CurrentType, expr_type, expr_type, Name, arity, null,
7305 MemberKind.All, BindingRestriction.AccessibleOnly);
7306 if (member_lookup == null)
7307 return null;
7308 }
7309
7310 MemberExpr me;
7311 TypeExpr texpr = member_lookup as TypeExpr;
7312 if (texpr != null) {
7313 if (!(expr_resolved is TypeExpr)) {
7314 me = expr_resolved as MemberExpr;
7315 if (me == null || me.ProbeIdenticalTypeName (ec, expr_resolved, original) == expr_resolved) {
7316 ec.Report.Error (572, loc, "`{0}': cannot reference a type through an expression; try `{1}' instead",
7317 Name, member_lookup.GetSignatureForError ());
7318 return null;
7319 }
7320 }
7321
7322 if (!texpr.CheckAccessLevel (ec.MemberContext)) {
7323 ec.Report.SymbolRelatedToPreviousError (member_lookup.Type);
7324 ErrorIsInaccesible (loc, TypeManager.CSharpName (member_lookup.Type), ec.Report);
7325 return null;
7326 }
7327
7328 if (HasTypeArguments) {
7329 var ct = new GenericTypeExpr (member_lookup.Type, targs, loc);
7330 return ct.ResolveAsTypeStep (ec, false);
7331 }
7332
7333 return member_lookup;
7334 }
7335
7336 me = (MemberExpr) member_lookup;
7337
7338 if (original != null && me.IsStatic)
7339 expr_resolved = me.ProbeIdenticalTypeName (ec, expr_resolved, original);
7340
7341 me = me.ResolveMemberAccess (ec, expr_resolved, original);
7342
7343 if (HasTypeArguments) {
7344 if (!targs.Resolve (ec))
7345 return null;
7346
7347 me.SetTypeArguments (ec, targs);
7348 }
7349
7350 if (original != null && (!TypeManager.IsValueType (expr_type) || me is PropertyExpr)) {
7351 if (me.IsInstance) {
7352 LocalVariableReference var = expr_resolved as LocalVariableReference;
7353 if (var != null && !var.VerifyAssigned (ec))
7354 return null;
7355 }
7356 }
7357
7358 // The following DoResolve/DoResolveLValue will do the definite assignment
7359 // check.
7360
7361 if (right_side != null)
7362 return me.DoResolveLValue (ec, right_side);
7363 else
7364 return me.Resolve (ec);
7365 }
7366
7367 protected override Expression DoResolve (ResolveContext ec)
7368 {
7369 return DoResolve (ec, null);
7370 }
7371
7372 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
7373 {
7374 return DoResolve (ec, right_side);
7375 }
7376
7377 public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
7378 {
7379 return ResolveNamespaceOrType (ec, silent);
7380 }
7381
7382 public FullNamedExpression ResolveNamespaceOrType (IMemberContext rc, bool silent)
7383 {
7384 FullNamedExpression expr_resolved = expr.ResolveAsTypeStep (rc, silent);
7385
7386 if (expr_resolved == null)
7387 return null;
7388
7389 Namespace ns = expr_resolved as Namespace;
7390 if (ns != null) {
7391 FullNamedExpression retval = ns.Lookup (rc.Compiler, Name, Arity, loc);
7392
7393 if (retval == null) {
7394 if (!silent)
7395 ns.Error_NamespaceDoesNotExist (loc, Name, Arity, rc);
7396 } else if (HasTypeArguments) {
7397 retval = new GenericTypeExpr (retval.Type, targs, loc).ResolveAsTypeStep (rc, silent);
7398 }
7399
7400 return retval;
7401 }
7402
7403 TypeExpr tnew_expr = expr_resolved.ResolveAsTypeTerminal (rc, false);
7404 if (tnew_expr == null)
7405 return null;
7406
7407 TypeSpec expr_type = tnew_expr.Type;
7408 if (TypeManager.IsGenericParameter (expr_type)) {
7409 rc.Compiler.Report.Error (704, loc, "A nested type cannot be specified through a type parameter `{0}'",
7410 tnew_expr.GetSignatureForError ());
7411 return null;
7412 }
7413
7414 var nested = MemberCache.FindNestedType (expr_type, Name, Arity);
7415 if (nested == null) {
7416 if (silent)
7417 return null;
7418
7419 Error_IdentifierNotFound (rc, expr_type, Name);
7420 return null;
7421 }
7422
7423 bool extra_check;
7424 if (!IsMemberAccessible (rc.CurrentType ?? InternalType.FakeInternalType, nested, out extra_check)) {
7425 ErrorIsInaccesible (loc, nested.GetSignatureForError (), rc.Compiler.Report);
7426 }
7427
7428 TypeExpr texpr;
7429 if (HasTypeArguments) {
7430 texpr = new GenericTypeExpr (nested, targs, loc);
7431 } else {
7432 texpr = new TypeExpression (nested, loc);
7433 }
7434
7435 return texpr.ResolveAsTypeStep (rc, false);
7436 }
7437
7438 protected virtual void Error_IdentifierNotFound (IMemberContext rc, TypeSpec expr_type, string identifier)
7439 {
7440 var nested = MemberCache.FindNestedType (expr_type, Name, -System.Math.Max (1, Arity));
7441
7442 if (nested != null) {
7443 Error_TypeArgumentsCannotBeUsed (rc.Compiler.Report, expr.Location, nested, Arity);
7444 return;
7445 }
7446
7447 var member_lookup = MemberLookup (rc.Compiler,
7448 rc.CurrentType, expr_type, expr_type, identifier, -1,
7449 MemberKind.All, BindingRestriction.None, loc);
7450
7451 if (member_lookup == null) {
7452 rc.Compiler.Report.Error (426, loc, "The nested type `{0}' does not exist in the type `{1}'",
7453 Name, expr_type.GetSignatureForError ());
7454 } else {
7455 // TODO: Report.SymbolRelatedToPreviousError
7456 member_lookup.Error_UnexpectedKind (rc.Compiler.Report, null, "type", loc);
7457 }
7458 }
7459
7460 protected override void Error_TypeDoesNotContainDefinition (ResolveContext ec, TypeSpec type, string name)
7461 {
7462 if (RootContext.Version > LanguageVersion.ISO_2 && !ec.Compiler.IsRuntimeBinder &&
7463 ((expr.eclass & (ExprClass.Value | ExprClass.Variable)) != 0)) {
7464 ec.Report.Error (1061, loc, "Type `{0}' does not contain a definition for `{1}' and no " +
7465 "extension method `{1}' of type `{0}' could be found " +
7466 "(are you missing a using directive or an assembly reference?)",
7467 TypeManager.CSharpName (type), name);
7468 return;
7469 }
7470
7471 base.Error_TypeDoesNotContainDefinition (ec, type, name);
7472 }
7473
7474 public override string GetSignatureForError ()
7475 {
7476 return expr.GetSignatureForError () + "." + base.GetSignatureForError ();
7477 }
7478
7479 public Expression Left {
7480 get {
7481 return expr;
7482 }
7483 }
7484
7485 protected override void CloneTo (CloneContext clonectx, Expression t)
7486 {
7487 MemberAccess target = (MemberAccess) t;
7488
7489 target.expr = expr.Clone (clonectx);
7490 }
7491 }
7492
7493 /// <summary>
7494 /// Implements checked expressions
7495 /// </summary>
7496 public class CheckedExpr : Expression {
7497
7498 public Expression Expr;
7499
7500 public CheckedExpr (Expression e, Location l)
7501 {
7502 Expr = e;
7503 loc = l;
7504 }
7505
7506 public override Expression CreateExpressionTree (ResolveContext ec)
7507 {
7508 using (ec.With (ResolveContext.Options.AllCheckStateFlags, true))
7509 return Expr.CreateExpressionTree (ec);
7510 }
7511
7512 protected override Expression DoResolve (ResolveContext ec)
7513 {
7514 using (ec.With (ResolveContext.Options.AllCheckStateFlags, true))
7515 Expr = Expr.Resolve (ec);
7516
7517 if (Expr == null)
7518 return null;
7519
7520 if (Expr is Constant || Expr is MethodGroupExpr || Expr is AnonymousMethodExpression || Expr is DefaultValueExpression)
7521 return Expr;
7522
7523 eclass = Expr.eclass;
7524 type = Expr.Type;
7525 return this;
7526 }
7527
7528 public override void Emit (EmitContext ec)
7529 {
7530 using (ec.With (EmitContext.Options.AllCheckStateFlags, true))
7531 Expr.Emit (ec);
7532 }
7533
7534 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
7535 {
7536 using (ec.With (EmitContext.Options.AllCheckStateFlags, true))
7537 Expr.EmitBranchable (ec, target, on_true);
7538 }
7539
7540 public override SLE.Expression MakeExpression (BuilderContext ctx)
7541 {
7542 using (ctx.With (BuilderContext.Options.AllCheckStateFlags, true)) {
7543 return Expr.MakeExpression (ctx);
7544 }
7545 }
7546
7547 protected override void CloneTo (CloneContext clonectx, Expression t)
7548 {
7549 CheckedExpr target = (CheckedExpr) t;
7550
7551 target.Expr = Expr.Clone (clonectx);
7552 }
7553 }
7554
7555 /// <summary>
7556 /// Implements the unchecked expression
7557 /// </summary>
7558 public class UnCheckedExpr : Expression {
7559
7560 public Expression Expr;
7561
7562 public UnCheckedExpr (Expression e, Location l)
7563 {
7564 Expr = e;
7565 loc = l;
7566 }
7567
7568 public override Expression CreateExpressionTree (ResolveContext ec)
7569 {
7570 using (ec.With (ResolveContext.Options.AllCheckStateFlags, false))
7571 return Expr.CreateExpressionTree (ec);
7572 }
7573
7574 protected override Expression DoResolve (ResolveContext ec)
7575 {
7576 using (ec.With (ResolveContext.Options.AllCheckStateFlags, false))
7577 Expr = Expr.Resolve (ec);
7578
7579 if (Expr == null)
7580 return null;
7581
7582 if (Expr is Constant || Expr is MethodGroupExpr || Expr is AnonymousMethodExpression || Expr is DefaultValueExpression)
7583 return Expr;
7584
7585 eclass = Expr.eclass;
7586 type = Expr.Type;
7587 return this;
7588 }
7589
7590 public override void Emit (EmitContext ec)
7591 {
7592 using (ec.With (EmitContext.Options.AllCheckStateFlags, false))
7593 Expr.Emit (ec);
7594 }
7595
7596 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
7597 {
7598 using (ec.With (EmitContext.Options.AllCheckStateFlags, false))
7599 Expr.EmitBranchable (ec, target, on_true);
7600 }
7601
7602 protected override void CloneTo (CloneContext clonectx, Expression t)
7603 {
7604 UnCheckedExpr target = (UnCheckedExpr) t;
7605
7606 target.Expr = Expr.Clone (clonectx);
7607 }
7608 }
7609
7610 /// <summary>
7611 /// An Element Access expression.
7612 ///
7613 /// During semantic analysis these are transformed into
7614 /// IndexerAccess, ArrayAccess or a PointerArithmetic.
7615 /// </summary>
7616 public class ElementAccess : Expression {
7617 public Arguments Arguments;
7618 public Expression Expr;
7619
7620 public ElementAccess (Expression e, Arguments args)
7621 {
7622 Expr = e;
7623 loc = e.Location;
7624 this.Arguments = args;
7625 }
7626
7627 public override Expression CreateExpressionTree (ResolveContext ec)
7628 {
7629 Arguments args = Arguments.CreateForExpressionTree (ec, Arguments,
7630 Expr.CreateExpressionTree (ec));
7631
7632 return CreateExpressionFactoryCall (ec, "ArrayIndex", args);
7633 }
7634
7635 Expression MakePointerAccess (ResolveContext ec, TypeSpec t)
7636 {
7637 if (Arguments.Count != 1){
7638 ec.Report.Error (196, loc, "A pointer must be indexed by only one value");
7639 return null;
7640 }
7641
7642 if (Arguments [0] is NamedArgument)
7643 Error_NamedArgument ((NamedArgument) Arguments[0], ec.Report);
7644
7645 Expression p = new PointerArithmetic (Binary.Operator.Addition, Expr, Arguments [0].Expr.Resolve (ec), t, loc);
7646 return new Indirection (p, loc).Resolve (ec);
7647 }
7648
7649 protected override Expression DoResolve (ResolveContext ec)
7650 {
7651 Expr = Expr.Resolve (ec);
7652 if (Expr == null)
7653 return null;
7654
7655 //
7656 // We perform some simple tests, and then to "split" the emit and store
7657 // code we create an instance of a different class, and return that.
7658 //
7659 // I am experimenting with this pattern.
7660 //
7661 TypeSpec t = Expr.Type;
7662
7663 if (t == TypeManager.array_type){
7664 ec.Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `System.Array'");
7665 return null;
7666 }
7667
7668 if (t.IsArray)
7669 return (new ArrayAccess (this, loc)).Resolve (ec);
7670 if (t.IsPointer)
7671 return MakePointerAccess (ec, t);
7672
7673 FieldExpr fe = Expr as FieldExpr;
7674 if (fe != null) {
7675 var ff = fe.Spec as FixedFieldSpec;
7676 if (ff != null) {
7677 return MakePointerAccess (ec, ff.ElementType);
7678 }
7679 }
7680 return (new IndexerAccess (this, loc)).Resolve (ec);
7681 }
7682
7683 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
7684 {
7685 Expr = Expr.Resolve (ec);
7686 if (Expr == null)
7687 return null;
7688
7689 type = Expr.Type;
7690 if (type.IsArray)
7691 return (new ArrayAccess (this, loc)).DoResolveLValue (ec, right_side);
7692
7693 if (type.IsPointer)
7694 return MakePointerAccess (ec, type);
7695
7696 if (Expr.eclass != ExprClass.Variable && TypeManager.IsStruct (type))
7697 Error_CannotModifyIntermediateExpressionValue (ec);
7698
7699 return (new IndexerAccess (this, loc)).DoResolveLValue (ec, right_side);
7700 }
7701
7702 public override void Emit (EmitContext ec)
7703 {
7704 throw new Exception ("Should never be reached");
7705 }
7706
7707 public static void Error_NamedArgument (NamedArgument na, Report Report)
7708 {
7709 Report.Error (1742, na.Location, "An element access expression cannot use named argument");
7710 }
7711
7712 public override string GetSignatureForError ()
7713 {
7714 return Expr.GetSignatureForError ();
7715 }
7716
7717 protected override void CloneTo (CloneContext clonectx, Expression t)
7718 {
7719 ElementAccess target = (ElementAccess) t;
7720
7721 target.Expr = Expr.Clone (clonectx);
7722 if (Arguments != null)
7723 target.Arguments = Arguments.Clone (clonectx);
7724 }
7725 }
7726
7727 /// <summary>
7728 /// Implements array access
7729 /// </summary>
7730 public class ArrayAccess : Expression, IDynamicAssign, IMemoryLocation {
7731 //
7732 // Points to our "data" repository
7733 //
7734 ElementAccess ea;
7735
7736 LocalTemporary temp;
7737
7738 bool prepared;
7739
7740 public ArrayAccess (ElementAccess ea_data, Location l)
7741 {
7742 ea = ea_data;
7743 loc = l;
7744 }
7745
7746 public override Expression CreateExpressionTree (ResolveContext ec)
7747 {
7748 return ea.CreateExpressionTree (ec);
7749 }
7750
7751 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
7752 {
7753 return DoResolve (ec);
7754 }
7755
7756 protected override Expression DoResolve (ResolveContext ec)
7757 {
7758 // dynamic is used per argument in ConvertExpressionToArrayIndex case
7759 bool dynamic;
7760 ea.Arguments.Resolve (ec, out dynamic);
7761
7762 TypeSpec t = ea.Expr.Type;
7763 int rank = ea.Arguments.Count;
7764 if (t.GetMetaInfo ().GetArrayRank () != rank) {
7765 ec.Report.Error (22, ea.Location, "Wrong number of indexes `{0}' inside [], expected `{1}'",
7766 ea.Arguments.Count.ToString (), t.GetMetaInfo ().GetArrayRank ().ToString ());
7767 return null;
7768 }
7769
7770 type = TypeManager.GetElementType (t);
7771 if (type.IsPointer && !ec.IsUnsafe) {
7772 UnsafeError (ec, ea.Location);
7773 }
7774
7775 foreach (Argument a in ea.Arguments) {
7776 if (a is NamedArgument)
7777 ElementAccess.Error_NamedArgument ((NamedArgument) a, ec.Report);
7778
7779 a.Expr = ConvertExpressionToArrayIndex (ec, a.Expr);
7780 }
7781
7782 eclass = ExprClass.Variable;
7783
7784 return this;
7785 }
7786
7787 protected override void Error_NegativeArrayIndex (ResolveContext ec, Location loc)
7788 {
7789 ec.Report.Warning (251, 2, loc, "Indexing an array with a negative index (array indices always start at zero)");
7790 }
7791
7792 //
7793 // Load the array arguments into the stack.
7794 //
7795 void LoadArrayAndArguments (EmitContext ec)
7796 {
7797 ea.Expr.Emit (ec);
7798
7799 for (int i = 0; i < ea.Arguments.Count; ++i) {
7800 ea.Arguments [i].Emit (ec);
7801 }
7802 }
7803
7804 public void Emit (EmitContext ec, bool leave_copy)
7805 {
7806 var ac = ea.Expr.Type as ArrayContainer;
7807
7808 if (prepared) {
7809 ec.EmitLoadFromPtr (type);
7810 } else {
7811 LoadArrayAndArguments (ec);
7812 ec.EmitArrayLoad (ac);
7813 }
7814
7815 if (leave_copy) {
7816 ec.Emit (OpCodes.Dup);
7817 temp = new LocalTemporary (this.type);
7818 temp.Store (ec);
7819 }
7820 }
7821
7822 public override void Emit (EmitContext ec)
7823 {
7824 Emit (ec, false);
7825 }
7826
7827 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
7828 {
7829 var ac = (ArrayContainer) ea.Expr.Type;
7830 TypeSpec t = source.Type;
7831 prepared = prepare_for_load;
7832
7833 if (prepared) {
7834 AddressOf (ec, AddressOp.LoadStore);
7835 ec.Emit (OpCodes.Dup);
7836 } else {
7837 LoadArrayAndArguments (ec);
7838
7839 //
7840 // If we are dealing with a struct, get the
7841 // address of it, so we can store it.
7842 //
7843 // The stobj opcode used by value types will need
7844 // an address on the stack, not really an array/array
7845 // pair
7846 //
7847 if (ac.Rank == 1 && TypeManager.IsStruct (t) &&
7848 (!TypeManager.IsBuiltinOrEnum (t) ||
7849 t == TypeManager.decimal_type)) {
7850
7851 ec.Emit (OpCodes.Ldelema, t);
7852 }
7853 }
7854
7855 source.Emit (ec);
7856 if (leave_copy) {
7857 ec.Emit (OpCodes.Dup);
7858 temp = new LocalTemporary (this.type);
7859 temp.Store (ec);
7860 }
7861
7862 if (prepared) {
7863 ec.EmitStoreFromPtr (t);
7864 } else {
7865 ec.EmitArrayStore (ac);
7866 }
7867
7868 if (temp != null) {
7869 temp.Emit (ec);
7870 temp.Release (ec);
7871 }
7872 }
7873
7874 public void EmitNew (EmitContext ec, New source, bool leave_copy)
7875 {
7876 if (!source.Emit (ec, this)) {
7877 if (leave_copy)
7878 throw new NotImplementedException ();
7879
7880 return;
7881 }
7882
7883 throw new NotImplementedException ();
7884 }
7885
7886 public void AddressOf (EmitContext ec, AddressOp mode)
7887 {
7888 var ac = (ArrayContainer) ea.Expr.Type;
7889
7890 LoadArrayAndArguments (ec);
7891 ec.EmitArrayAddress (ac);
7892 }
7893
7894 #if NET_4_0
7895 public SLE.Expression MakeAssignExpression (BuilderContext ctx)
7896 {
7897 return SLE.Expression.ArrayAccess (
7898 ea.Expr.MakeExpression (ctx),
7899 Arguments.MakeExpression (ea.Arguments, ctx));
7900 }
7901 #endif
7902
7903 public override SLE.Expression MakeExpression (BuilderContext ctx)
7904 {
7905 return SLE.Expression.ArrayIndex (
7906 ea.Expr.MakeExpression (ctx),
7907 Arguments.MakeExpression (ea.Arguments, ctx));
7908 }
7909 }
7910
7911 /// <summary>
7912 /// Expressions that represent an indexer call.
7913 /// </summary>
7914 public class IndexerAccess : Expression, IDynamicAssign
7915 {
7916 class IndexerMethodGroupExpr : MethodGroupExpr
7917 {
7918 IEnumerable<IndexerSpec> candidates;
7919
7920 public IndexerMethodGroupExpr (IEnumerable<IndexerSpec> indexers, Location loc)
7921 : base (FilterAccessors (indexers).ToList (), null, loc)
7922 {
7923 candidates = indexers;
7924 }
7925
7926 public IndexerSpec BestIndexer ()
7927 {
7928 return MemberCache.FindIndexers (BestCandidate.DeclaringType, BindingRestriction.None).
7929 Where (l =>
7930 (l.HasGet && l.Get.MemberDefinition == BestCandidate.MemberDefinition) ||
7931 (l.HasSet && l.Set.MemberDefinition == BestCandidate.MemberDefinition)).First ();
7932 }
7933
7934 static IEnumerable<MemberSpec> FilterAccessors (IEnumerable<IndexerSpec> indexers)
7935 {
7936 foreach (IndexerSpec i in indexers) {
7937 if (i.HasGet)
7938 yield return i.Get;
7939 else
7940 yield return i.Set;
7941 }
7942 }
7943
7944 protected override IList<MemberSpec> GetBaseTypeMethods (ResolveContext rc, TypeSpec type)
7945 {
7946 candidates = GetIndexersForType (type);
7947 if (candidates == null)
7948 return null;
7949
7950 return FilterAccessors (candidates).ToList ();
7951 }
7952
7953 public override string Name {
7954 get {
7955 return "this";
7956 }
7957 }
7958
7959 protected override int GetApplicableParametersCount (MethodSpec method, AParametersCollection parameters)
7960 {
7961 //
7962 // Here is the trick, decrease number of arguments by 1 when only
7963 // available property method is setter. This makes overload resolution
7964 // work correctly for indexers.
7965 //
7966
7967 if (method.Name [0] == 'g')
7968 return parameters.Count;
7969
7970 return parameters.Count - 1;
7971 }
7972 }
7973
7974 //
7975 // Points to our "data" repository
7976 //
7977 IndexerSpec spec;
7978 bool is_base_indexer;
7979 bool prepared;
7980 LocalTemporary temp;
7981 LocalTemporary prepared_value;
7982 Expression set_expr;
7983
7984 protected TypeSpec indexer_type;
7985 protected TypeSpec current_type;
7986 protected Expression instance_expr;
7987 protected Arguments arguments;
7988
7989 public IndexerAccess (ElementAccess ea, Location loc)
7990 : this (ea.Expr, false, loc)
7991 {
7992 this.arguments = ea.Arguments;
7993 }
7994
7995 protected IndexerAccess (Expression instance_expr, bool is_base_indexer,
7996 Location loc)
7997 {
7998 this.instance_expr = instance_expr;
7999 this.is_base_indexer = is_base_indexer;
8000 this.loc = loc;
8001 }
8002
8003 static string GetAccessorName (bool isSet)
8004 {
8005 return isSet ? "set" : "get";
8006 }
8007
8008 public override Expression CreateExpressionTree (ResolveContext ec)
8009 {
8010 Arguments args = Arguments.CreateForExpressionTree (ec, arguments,
8011 instance_expr.CreateExpressionTree (ec),
8012 new TypeOfMethod (spec.Get, loc));
8013
8014 return CreateExpressionFactoryCall (ec, "Call", args);
8015 }
8016
8017 static IEnumerable<IndexerSpec> GetIndexersForType (TypeSpec lookup_type)
8018 {
8019 return MemberCache.FindIndexers (lookup_type, BindingRestriction.AccessibleOnly | BindingRestriction.NoOverrides);
8020 }
8021
8022 protected virtual void CommonResolve (ResolveContext ec)
8023 {
8024 indexer_type = instance_expr.Type;
8025 current_type = ec.CurrentType;
8026 }
8027
8028 protected override Expression DoResolve (ResolveContext ec)
8029 {
8030 return ResolveAccessor (ec, null);
8031 }
8032
8033 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
8034 {
8035 if (right_side == EmptyExpression.OutAccess.Instance) {
8036 right_side.DoResolveLValue (ec, this);
8037 return null;
8038 }
8039
8040 // if the indexer returns a value type, and we try to set a field in it
8041 if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess) {
8042 Error_CannotModifyIntermediateExpressionValue (ec);
8043 }
8044
8045 return ResolveAccessor (ec, right_side);
8046 }
8047
8048 Expression ResolveAccessor (ResolveContext ec, Expression right_side)
8049 {
8050 CommonResolve (ec);
8051
8052 bool dynamic;
8053
8054 arguments.Resolve (ec, out dynamic);
8055
8056 if (indexer_type == InternalType.Dynamic) {
8057 dynamic = true;
8058 } else {
8059 var ilist = GetIndexersForType (indexer_type);
8060 if (ilist == null) {
8061 ec.Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `{0}'",
8062 TypeManager.CSharpName (indexer_type));
8063 return null;
8064 }
8065
8066 var mg = new IndexerMethodGroupExpr (ilist, loc) {
8067 InstanceExpression = instance_expr
8068 };
8069
8070 if (is_base_indexer)
8071 mg.QueriedBaseType = current_type;
8072
8073 mg = mg.OverloadResolve (ec, ref arguments, false, loc) as IndexerMethodGroupExpr;
8074 if (mg == null)
8075 return null;
8076
8077 if (!dynamic)
8078 spec = mg.BestIndexer ();
8079 }
8080
8081 if (dynamic) {
8082 Arguments args = new Arguments (arguments.Count + 1);
8083 if (is_base_indexer) {
8084 ec.Report.Error (1972, loc, "The indexer base access cannot be dynamically dispatched. Consider casting the dynamic arguments or eliminating the base access");
8085 } else {
8086 args.Add (new Argument (instance_expr));
8087 }
8088 args.AddRange (arguments);
8089
8090 var expr = new DynamicIndexBinder (args, loc);
8091 if (right_side != null)
8092 return expr.ResolveLValue (ec, right_side);
8093
8094 return expr.Resolve (ec);
8095 }
8096
8097 type = spec.MemberType;
8098 if (type.IsPointer && !ec.IsUnsafe)
8099 UnsafeError (ec, loc);
8100
8101 MethodSpec accessor;
8102 if (right_side == null) {
8103 accessor = spec.Get;
8104 } else {
8105 accessor = spec.Set;
8106 if (!spec.HasSet && spec.HasGet) {
8107 ec.Report.SymbolRelatedToPreviousError (spec);
8108 ec.Report.Error (200, loc, "The read only property or indexer `{0}' cannot be assigned to",
8109 spec.GetSignatureForError ());
8110 return null;
8111 }
8112
8113 set_expr = Convert.ImplicitConversion (ec, right_side, type, loc);
8114 }
8115
8116 if (accessor == null || accessor.Kind == MemberKind.FakeMethod) {
8117 ec.Report.SymbolRelatedToPreviousError (spec);
8118 ec.Report.Error (154, loc, "The property or indexer `{0}' cannot be used in this context because it lacks a `{1}' accessor",
8119 spec.GetSignatureForError (), GetAccessorName (right_side != null));
8120 return null;
8121 }
8122
8123 //
8124 // Only base will allow this invocation to happen.
8125 //
8126 if (spec.IsAbstract && this is BaseIndexerAccess) {
8127 Error_CannotCallAbstractBase (ec, spec.GetSignatureForError ());
8128 }
8129
8130 bool must_do_cs1540_check;
8131 if (!IsMemberAccessible (ec.CurrentType, accessor, out must_do_cs1540_check)) {
8132 if (spec.HasDifferentAccessibility) {
8133 ec.Report.SymbolRelatedToPreviousError (accessor);
8134 ec.Report.Error (271, loc, "The property or indexer `{0}' cannot be used in this context because a `{1}' accessor is inaccessible",
8135 TypeManager.GetFullNameSignature (spec), GetAccessorName (right_side != null));
8136 } else {
8137 ec.Report.SymbolRelatedToPreviousError (spec);
8138 ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (spec), ec.Report);
8139 }
8140 }
8141
8142 instance_expr.CheckMarshalByRefAccess (ec);
8143
8144 if (must_do_cs1540_check && (instance_expr != EmptyExpression.Null) &&
8145 !TypeManager.IsInstantiationOfSameGenericType (instance_expr.Type, ec.CurrentType) &&
8146 !TypeManager.IsNestedChildOf (ec.CurrentType, instance_expr.Type) &&
8147 !TypeManager.IsSubclassOf (instance_expr.Type, ec.CurrentType)) {
8148 ec.Report.SymbolRelatedToPreviousError (accessor);
8149 Error_CannotAccessProtected (ec, loc, spec, instance_expr.Type, ec.CurrentType);
8150 return null;
8151 }
8152
8153 eclass = ExprClass.IndexerAccess;
8154 return this;
8155 }
8156
8157 public override void Emit (EmitContext ec)
8158 {
8159 Emit (ec, false);
8160 }
8161
8162 public void Emit (EmitContext ec, bool leave_copy)
8163 {
8164 if (prepared) {
8165 prepared_value.Emit (ec);
8166 } else {
8167 Invocation.EmitCall (ec, is_base_indexer, instance_expr, spec.Get,
8168 arguments, loc, false, false);
8169 }
8170
8171 if (leave_copy) {
8172 ec.Emit (OpCodes.Dup);
8173 temp = new LocalTemporary (Type);
8174 temp.Store (ec);
8175 }
8176 }
8177
8178 //
8179 // source is ignored, because we already have a copy of it from the
8180 // LValue resolution and we have already constructed a pre-cached
8181 // version of the arguments (ea.set_arguments);
8182 //
8183 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
8184 {
8185 prepared = prepare_for_load;
8186 Expression value = set_expr;
8187
8188 if (prepared) {
8189 Invocation.EmitCall (ec, is_base_indexer, instance_expr, spec.Get,
8190 arguments, loc, true, false);
8191
8192 prepared_value = new LocalTemporary (type);
8193 prepared_value.Store (ec);
8194 source.Emit (ec);
8195 prepared_value.Release (ec);
8196
8197 if (leave_copy) {
8198 ec.Emit (OpCodes.Dup);
8199 temp = new LocalTemporary (Type);
8200 temp.Store (ec);
8201 }
8202 } else if (leave_copy) {
8203 temp = new LocalTemporary (Type);
8204 source.Emit (ec);
8205 temp.Store (ec);
8206 value = temp;
8207 }
8208
8209 if (!prepared)
8210 arguments.Add (new Argument (value));
8211
8212 Invocation.EmitCall (ec, is_base_indexer, instance_expr, spec.Set, arguments, loc, false, prepared);
8213
8214 if (temp != null) {
8215 temp.Emit (ec);
8216 temp.Release (ec);
8217 }
8218 }
8219
8220 public override string GetSignatureForError ()
8221 {
8222 return spec.GetSignatureForError ();
8223 }
8224
8225 #if NET_4_0
8226 public SLE.Expression MakeAssignExpression (BuilderContext ctx)
8227 {
8228 var value = new[] { set_expr.MakeExpression (ctx) };
8229 var args = Arguments.MakeExpression (arguments, ctx).Concat (value);
8230
8231 return SLE.Expression.Block (
8232 SLE.Expression.Call (instance_expr.MakeExpression (ctx), (MethodInfo) spec.Set.GetMetaInfo (), args),
8233 value [0]);
8234 }
8235 #endif
8236
8237 public override SLE.Expression MakeExpression (BuilderContext ctx)
8238 {
8239 var args = Arguments.MakeExpression (arguments, ctx);
8240 return SLE.Expression.Call (instance_expr.MakeExpression (ctx), (MethodInfo) spec.Get.GetMetaInfo (), args);
8241 }
8242
8243 protected override void CloneTo (CloneContext clonectx, Expression t)
8244 {
8245 IndexerAccess target = (IndexerAccess) t;
8246
8247 if (arguments != null)
8248 target.arguments = arguments.Clone (clonectx);
8249
8250 if (instance_expr != null)
8251 target.instance_expr = instance_expr.Clone (clonectx);
8252 }
8253 }
8254
8255 /// <summary>
8256 /// The base operator for method names
8257 /// </summary>
8258 public class BaseAccess : Expression {
8259 public readonly string Identifier;
8260 TypeArguments args;
8261
8262 public BaseAccess (string member, Location l)
8263 {
8264 this.Identifier = member;
8265 loc = l;
8266 }
8267
8268 public BaseAccess (string member, TypeArguments args, Location l)
8269 : this (member, l)
8270 {
8271 this.args = args;
8272 }
8273
8274 public override Expression CreateExpressionTree (ResolveContext ec)
8275 {
8276 throw new NotSupportedException ("ET");
8277 }
8278
8279 protected override Expression DoResolve (ResolveContext ec)
8280 {
8281 Expression c = CommonResolve (ec);
8282
8283 if (c == null)
8284 return null;
8285
8286 //
8287 // MethodGroups use this opportunity to flag an error on lacking ()
8288 //
8289 if (!(c is MethodGroupExpr))
8290 return c.Resolve (ec);
8291 return c;
8292 }
8293
8294 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
8295 {
8296 Expression c = CommonResolve (ec);
8297
8298 if (c == null)
8299 return null;
8300
8301 //
8302 // MethodGroups use this opportunity to flag an error on lacking ()
8303 //
8304 if (! (c is MethodGroupExpr))
8305 return c.DoResolveLValue (ec, right_side);
8306
8307 return c;
8308 }
8309
8310 Expression CommonResolve (ResolveContext ec)
8311 {
8312 Expression member_lookup;
8313 TypeSpec current_type = ec.CurrentType;
8314 TypeSpec base_type = current_type.BaseType;
8315
8316 if (!This.IsThisAvailable (ec, false)) {
8317 if (ec.IsStatic) {
8318 ec.Report.Error (1511, loc, "Keyword `base' is not available in a static method");
8319 } else {
8320 ec.Report.Error (1512, loc, "Keyword `base' is not available in the current context");
8321 }
8322 return null;
8323 }
8324
8325 var arity = args == null ? -1 : args.Count;
8326 member_lookup = MemberLookup (ec.Compiler, ec.CurrentType, null, base_type, Identifier, arity,
8327 MemberKind.All, BindingRestriction.AccessibleOnly | BindingRestriction.NoOverrides, loc);
8328 if (member_lookup == null) {
8329 Error_MemberLookupFailed (ec, ec.CurrentType, base_type, base_type, Identifier, arity,
8330 null, MemberKind.All, BindingRestriction.AccessibleOnly);
8331 return null;
8332 }
8333
8334 MemberExpr me = member_lookup as MemberExpr;
8335 if (me == null){
8336 if (member_lookup is TypeExpression){
8337 ec.Report.Error (582, loc, "{0}: Can not reference a type through an expression, try `{1}' instead",
8338 Identifier, member_lookup.GetSignatureForError ());
8339 } else {
8340 ec.Report.Error (582, loc, "{0}: Can not reference a {1} through an expression",
8341 Identifier, member_lookup.ExprClassName);
8342 }
8343
8344 return null;
8345 }
8346
8347 me.QueriedBaseType = base_type;
8348
8349 if (args != null) {
8350 args.Resolve (ec);
8351 me.SetTypeArguments (ec, args);
8352 }
8353
8354 return me;
8355 }
8356
8357 public override void Emit (EmitContext ec)
8358 {
8359 throw new Exception ("Should never be called");
8360 }
8361
8362 protected override void CloneTo (CloneContext clonectx, Expression t)
8363 {
8364 BaseAccess target = (BaseAccess) t;
8365
8366 if (args != null)
8367 target.args = args.Clone ();
8368 }
8369 }
8370
8371 /// <summary>
8372 /// The base indexer operator
8373 /// </summary>
8374 public class BaseIndexerAccess : IndexerAccess {
8375 public BaseIndexerAccess (Arguments args, Location loc)
8376 : base (null, true, loc)
8377 {
8378 this.arguments = args;
8379 }
8380
8381 protected override void CommonResolve (ResolveContext ec)
8382 {
8383 instance_expr = ec.GetThis (loc);
8384
8385 current_type = ec.CurrentType.BaseType;
8386 indexer_type = current_type;
8387 }
8388
8389 public override Expression CreateExpressionTree (ResolveContext ec)
8390 {
8391 MemberExpr.Error_BaseAccessInExpressionTree (ec, loc);
8392 return base.CreateExpressionTree (ec);
8393 }
8394 }
8395
8396 /// <summary>
8397 /// This class exists solely to pass the Type around and to be a dummy
8398 /// that can be passed to the conversion functions (this is used by
8399 /// foreach implementation to typecast the object return value from
8400 /// get_Current into the proper type. All code has been generated and
8401 /// we only care about the side effect conversions to be performed
8402 ///
8403 /// This is also now used as a placeholder where a no-action expression
8404 /// is needed (the `New' class).
8405 /// </summary>
8406 public class EmptyExpression : Expression {
8407 public static readonly Expression Null = new EmptyExpression ();
8408
8409 public class OutAccess : EmptyExpression
8410 {
8411 public static readonly OutAccess Instance = new OutAccess ();
8412
8413 public override Expression DoResolveLValue (ResolveContext rc, Expression right_side)
8414 {
8415 rc.Report.Error (206, right_side.Location,
8416 "A property, indexer or dynamic member access may not be passed as `ref' or `out' parameter");
8417
8418 return null;
8419 }
8420 }
8421
8422 public static readonly EmptyExpression LValueMemberAccess = new EmptyExpression ();
8423 public static readonly EmptyExpression LValueMemberOutAccess = new EmptyExpression ();
8424 public static readonly EmptyExpression UnaryAddress = new EmptyExpression ();
8425
8426 static EmptyExpression temp = new EmptyExpression ();
8427 public static EmptyExpression Grab ()
8428 {
8429 EmptyExpression retval = temp == null ? new EmptyExpression () : temp;
8430 temp = null;
8431 return retval;
8432 }
8433
8434 public static void Release (EmptyExpression e)
8435 {
8436 temp = e;
8437 }
8438
8439 EmptyExpression ()
8440 {
8441 // FIXME: Don't set to object
8442 type = TypeManager.object_type;
8443 eclass = ExprClass.Value;
8444 loc = Location.Null;
8445 }
8446
8447 public EmptyExpression (TypeSpec t)
8448 {
8449 type = t;
8450 eclass = ExprClass.Value;
8451 loc = Location.Null;
8452 }
8453
8454 public override Expression CreateExpressionTree (ResolveContext ec)
8455 {
8456 throw new NotSupportedException ("ET");
8457 }
8458
8459 protected override Expression DoResolve (ResolveContext ec)
8460 {
8461 return this;
8462 }
8463
8464 public override void Emit (EmitContext ec)
8465 {
8466 // nothing, as we only exist to not do anything.
8467 }
8468
8469 public override void EmitSideEffect (EmitContext ec)
8470 {
8471 }
8472
8473 //
8474 // This is just because we might want to reuse this bad boy
8475 // instead of creating gazillions of EmptyExpressions.
8476 // (CanImplicitConversion uses it)
8477 //
8478 public void SetType (TypeSpec t)
8479 {
8480 type = t;
8481 }
8482 }
8483
8484 //
8485 // Empty statement expression
8486 //
8487 public sealed class EmptyExpressionStatement : ExpressionStatement
8488 {
8489 public static readonly EmptyExpressionStatement Instance = new EmptyExpressionStatement ();
8490
8491 private EmptyExpressionStatement ()
8492 {
8493 loc = Location.Null;
8494 }
8495
8496 public override Expression CreateExpressionTree (ResolveContext ec)
8497 {
8498 return null;
8499 }
8500
8501 public override void EmitStatement (EmitContext ec)
8502 {
8503 // Do nothing
8504 }
8505
8506 protected override Expression DoResolve (ResolveContext ec)
8507 {
8508 eclass = ExprClass.Value;
8509 type = TypeManager.object_type;
8510 return this;
8511 }
8512
8513 public override void Emit (EmitContext ec)
8514 {
8515 // Do nothing
8516 }
8517 }
8518
8519 public class UserCast : Expression {
8520 MethodSpec method;
8521 Expression source;
8522
8523 public UserCast (MethodSpec method, Expression source, Location l)
8524 {
8525 this.method = method;
8526 this.source = source;
8527 type = method.ReturnType;
8528 loc = l;
8529 }
8530
8531 public Expression Source {
8532 get {
8533 return source;
8534 }
8535 }
8536
8537 public override Expression CreateExpressionTree (ResolveContext ec)
8538 {
8539 Arguments args = new Arguments (3);
8540 args.Add (new Argument (source.CreateExpressionTree (ec)));
8541 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
8542 args.Add (new Argument (new TypeOfMethod (method, loc)));
8543 return CreateExpressionFactoryCall (ec, "Convert", args);
8544 }
8545
8546 protected override Expression DoResolve (ResolveContext ec)
8547 {
8548 ObsoleteAttribute oa = method.GetAttributeObsolete ();
8549 if (oa != null)
8550 AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, ec.Report);
8551
8552 eclass = ExprClass.Value;
8553 return this;
8554 }
8555
8556 public override void Emit (EmitContext ec)
8557 {
8558 source.Emit (ec);
8559 ec.Emit (OpCodes.Call, method);
8560 }
8561
8562 public override string GetSignatureForError ()
8563 {
8564 return TypeManager.CSharpSignature (method);
8565 }
8566
8567 public override SLE.Expression MakeExpression (BuilderContext ctx)
8568 {
8569 return SLE.Expression.Convert (source.MakeExpression (ctx), type.GetMetaInfo (), (MethodInfo) method.GetMetaInfo ());
8570 }
8571 }
8572
8573 // <summary>
8574 // This class is used to "construct" the type during a typecast
8575 // operation. Since the Type.GetType class in .NET can parse
8576 // the type specification, we just use this to construct the type
8577 // one bit at a time.
8578 // </summary>
8579 public class ComposedCast : TypeExpr {
8580 FullNamedExpression left;
8581 string dim;
8582
8583 public ComposedCast (FullNamedExpression left, string dim)
8584 : this (left, dim, left.Location)
8585 {
8586 }
8587
8588 public ComposedCast (FullNamedExpression left, string dim, Location l)
8589 {
8590 this.left = left;
8591 this.dim = dim;
8592 loc = l;
8593 }
8594
8595 protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
8596 {
8597 TypeExpr lexpr = left.ResolveAsTypeTerminal (ec, false);
8598 if (lexpr == null)
8599 return null;
8600
8601 TypeSpec ltype = lexpr.Type;
8602 if ((dim.Length > 0) && (dim [0] == '?')) {
8603 TypeExpr nullable = new Nullable.NullableType (lexpr, loc);
8604 if (dim.Length > 1)
8605 nullable = new ComposedCast (nullable, dim.Substring (1), loc);
8606 return nullable.ResolveAsTypeTerminal (ec, false);
8607 }
8608
8609 if (dim == "*" && !TypeManager.VerifyUnmanaged (ec.Compiler, ltype, loc))
8610 return null;
8611
8612 if (dim.Length != 0 && dim [0] == '[') {
8613 if (TypeManager.IsSpecialType (ltype)) {
8614 ec.Compiler.Report.Error (611, loc, "Array elements cannot be of type `{0}'", TypeManager.CSharpName (ltype));
8615 return null;
8616 }
8617
8618 if (ltype.IsStatic) {
8619 ec.Compiler.Report.SymbolRelatedToPreviousError (ltype);
8620 ec.Compiler.Report.Error (719, loc, "Array elements cannot be of static type `{0}'",
8621 TypeManager.CSharpName (ltype));
8622 }
8623 }
8624
8625 if (dim != "")
8626 type = TypeManager.GetConstructedType (ltype, dim);
8627 else
8628 type = ltype;
8629
8630 if (type == null)
8631 throw new InternalErrorException ("Couldn't create computed type " + ltype + dim);
8632
8633 if (type.IsPointer && !ec.IsUnsafe){
8634 UnsafeError (ec.Compiler.Report, loc);
8635 }
8636
8637 eclass = ExprClass.Type;
8638 return this;
8639 }
8640
8641 public override string GetSignatureForError ()
8642 {
8643 return left.GetSignatureForError () + dim;
8644 }
8645 }
8646
8647 public class FixedBufferPtr : Expression {
8648 Expression array;
8649
8650 public FixedBufferPtr (Expression array, TypeSpec array_type, Location l)
8651 {
8652 this.array = array;
8653 this.loc = l;
8654
8655 type = PointerContainer.MakeType (array_type);
8656 eclass = ExprClass.Value;
8657 }
8658
8659 public override Expression CreateExpressionTree (ResolveContext ec)
8660 {
8661 Error_PointerInsideExpressionTree (ec);
8662 return null;
8663 }
8664
8665 public override void Emit(EmitContext ec)
8666 {
8667 array.Emit (ec);
8668 }
8669
8670 protected override Expression DoResolve (ResolveContext ec)
8671 {
8672 //
8673 // We are born fully resolved
8674 //
8675 return this;
8676 }
8677 }
8678
8679
8680 //
8681 // This class is used to represent the address of an array, used
8682 // only by the Fixed statement, this generates "&a [0]" construct
8683 // for fixed (char *pa = a)
8684 //
8685 public class ArrayPtr : FixedBufferPtr {
8686 TypeSpec array_type;
8687
8688 public ArrayPtr (Expression array, TypeSpec array_type, Location l):
8689 base (array, array_type, l)
8690 {
8691 this.array_type = array_type;
8692 }
8693
8694 public override void Emit (EmitContext ec)
8695 {
8696 base.Emit (ec);
8697
8698 ec.EmitInt (0);
8699 ec.Emit (OpCodes.Ldelema, array_type);
8700 }
8701 }
8702
8703 //
8704 // Encapsulates a conversion rules required for array indexes
8705 //
8706 public class ArrayIndexCast : TypeCast
8707 {
8708 public ArrayIndexCast (Expression expr)
8709 : base (expr, TypeManager.int32_type)
8710 {
8711 if (expr.Type == TypeManager.int32_type)
8712 throw new ArgumentException ("unnecessary array index conversion");
8713 }
8714
8715 public override Expression CreateExpressionTree (ResolveContext ec)
8716 {
8717 using (ec.Set (ResolveContext.Options.CheckedScope)) {
8718 return base.CreateExpressionTree (ec);
8719 }
8720 }
8721
8722 public override void Emit (EmitContext ec)
8723 {
8724 child.Emit (ec);
8725
8726 var expr_type = child.Type;
8727
8728 if (expr_type == TypeManager.uint32_type)
8729 ec.Emit (OpCodes.Conv_U);
8730 else if (expr_type == TypeManager.int64_type)
8731 ec.Emit (OpCodes.Conv_Ovf_I);
8732 else if (expr_type == TypeManager.uint64_type)
8733 ec.Emit (OpCodes.Conv_Ovf_I_Un);
8734 else
8735 throw new InternalErrorException ("Cannot emit cast to unknown array element type", type);
8736 }
8737 }
8738
8739 //
8740 // Implements the `stackalloc' keyword
8741 //
8742 public class StackAlloc : Expression {
8743 TypeSpec otype;
8744 Expression t;
8745 Expression count;
8746
8747 public StackAlloc (Expression type, Expression count, Location l)
8748 {
8749 t = type;
8750 this.count = count;
8751 loc = l;
8752 }
8753
8754 public override Expression CreateExpressionTree (ResolveContext ec)
8755 {
8756 throw new NotSupportedException ("ET");
8757 }
8758
8759 protected override Expression DoResolve (ResolveContext ec)
8760 {
8761 count = count.Resolve (ec);
8762 if (count == null)
8763 return null;
8764
8765 if (count.Type != TypeManager.uint32_type){
8766 count = Convert.ImplicitConversionRequired (ec, count, TypeManager.int32_type, loc);
8767 if (count == null)
8768 return null;
8769 }
8770
8771 Constant c = count as Constant;
8772 if (c != null && c.IsNegative) {
8773 ec.Report.Error (247, loc, "Cannot use a negative size with stackalloc");
8774 }
8775
8776 if (ec.HasAny (ResolveContext.Options.CatchScope | ResolveContext.Options.FinallyScope)) {
8777 ec.Report.Error (255, loc, "Cannot use stackalloc in finally or catch");
8778 }
8779
8780 TypeExpr texpr = t.ResolveAsTypeTerminal (ec, false);
8781 if (texpr == null)
8782 return null;
8783
8784 otype = texpr.Type;
8785
8786 if (!TypeManager.VerifyUnmanaged (ec.Compiler, otype, loc))
8787 return null;
8788
8789 type = PointerContainer.MakeType (otype);
8790 eclass = ExprClass.Value;
8791
8792 return this;
8793 }
8794
8795 public override void Emit (EmitContext ec)
8796 {
8797 int size = GetTypeSize (otype);
8798
8799 count.Emit (ec);
8800
8801 if (size == 0)
8802 ec.Emit (OpCodes.Sizeof, otype);
8803 else
8804 ec.EmitInt (size);
8805
8806 ec.Emit (OpCodes.Mul_Ovf_Un);
8807 ec.Emit (OpCodes.Localloc);
8808 }
8809
8810 protected override void CloneTo (CloneContext clonectx, Expression t)
8811 {
8812 StackAlloc target = (StackAlloc) t;
8813 target.count = count.Clone (clonectx);
8814 target.t = t.Clone (clonectx);
8815 }
8816 }
8817
8818 //
8819 // An object initializer expression
8820 //
8821 public class ElementInitializer : Assign
8822 {
8823 public readonly string Name;
8824
8825 public ElementInitializer (string name, Expression initializer, Location loc)
8826 : base (null, initializer, loc)
8827 {
8828 this.Name = name;
8829 }
8830
8831 protected override void CloneTo (CloneContext clonectx, Expression t)
8832 {
8833 ElementInitializer target = (ElementInitializer) t;
8834 target.source = source.Clone (clonectx);
8835 }
8836
8837 public override Expression CreateExpressionTree (ResolveContext ec)
8838 {
8839 Arguments args = new Arguments (2);
8840 FieldExpr fe = target as FieldExpr;
8841 if (fe != null)
8842 args.Add (new Argument (fe.CreateTypeOfExpression ()));
8843 else
8844 args.Add (new Argument (((PropertyExpr)target).CreateSetterTypeOfExpression ()));
8845
8846 args.Add (new Argument (source.CreateExpressionTree (ec)));
8847 return CreateExpressionFactoryCall (ec,
8848 source is CollectionOrObjectInitializers ? "ListBind" : "Bind",
8849 args);
8850 }
8851
8852 protected override Expression DoResolve (ResolveContext ec)
8853 {
8854 if (source == null)
8855 return EmptyExpressionStatement.Instance;
8856
8857 MemberExpr me = MemberLookupFinal (ec, ec.CurrentInitializerVariable.Type, ec.CurrentInitializerVariable.Type,
8858 Name, 0, MemberKind.Field | MemberKind.Property, BindingRestriction.AccessibleOnly | BindingRestriction.InstanceOnly, loc) as MemberExpr;
8859
8860 if (me == null)
8861 return null;
8862
8863 target = me;
8864 me.InstanceExpression = ec.CurrentInitializerVariable;
8865
8866 if (source is CollectionOrObjectInitializers) {
8867 Expression previous = ec.CurrentInitializerVariable;
8868 ec.CurrentInitializerVariable = target;
8869 source = source.Resolve (ec);
8870 ec.CurrentInitializerVariable = previous;
8871 if (source == null)
8872 return null;
8873
8874 eclass = source.eclass;
8875 type = source.Type;
8876 return this;
8877 }
8878
8879 Expression expr = base.DoResolve (ec);
8880 if (expr == null)
8881 return null;
8882
8883 //
8884 // Ignore field initializers with default value
8885 //
8886 Constant c = source as Constant;
8887 if (c != null && c.IsDefaultInitializer (type) && target.eclass == ExprClass.Variable)
8888 return EmptyExpressionStatement.Instance.Resolve (ec);
8889
8890 return expr;
8891 }
8892
8893 protected override MemberExpr Error_MemberLookupFailed (ResolveContext ec, TypeSpec type, IList<MemberSpec> members)
8894 {
8895 var member = members.First ();
8896 if (member.Kind != MemberKind.Property && member.Kind != MemberKind.Field)
8897 ec.Report.Error (1913, loc, "Member `{0}' cannot be initialized. An object " +
8898 "initializer may only be used for fields, or properties", TypeManager.GetFullNameSignature (member));
8899 else
8900 ec.Report.Error (1914, loc, " Static field or property `{0}' cannot be assigned in an object initializer",
8901 TypeManager.GetFullNameSignature (member));
8902
8903 return null;
8904 }
8905
8906 public override void EmitStatement (EmitContext ec)
8907 {
8908 if (source is CollectionOrObjectInitializers)
8909 source.Emit (ec);
8910 else
8911 base.EmitStatement (ec);
8912 }
8913 }
8914
8915 //
8916 // A collection initializer expression
8917 //
8918 class CollectionElementInitializer : Invocation
8919 {
8920 public class ElementInitializerArgument : Argument
8921 {
8922 public ElementInitializerArgument (Expression e)
8923 : base (e)
8924 {
8925 }
8926 }
8927
8928 sealed class AddMemberAccess : MemberAccess
8929 {
8930 public AddMemberAccess (Expression expr, Location loc)
8931 : base (expr, "Add", loc)
8932 {
8933 }
8934
8935 protected override void Error_TypeDoesNotContainDefinition (ResolveContext ec, TypeSpec type, string name)
8936 {
8937 if (TypeManager.HasElementType (type))
8938 return;
8939
8940 base.Error_TypeDoesNotContainDefinition (ec, type, name);
8941 }
8942 }
8943
8944 public CollectionElementInitializer (Expression argument)
8945 : base (null, new Arguments (1))
8946 {
8947 base.arguments.Add (new ElementInitializerArgument (argument));
8948 this.loc = argument.Location;
8949 }
8950
8951 public CollectionElementInitializer (List<Expression> arguments, Location loc)
8952 : base (null, new Arguments (arguments.Count))
8953 {
8954 foreach (Expression e in arguments)
8955 base.arguments.Add (new ElementInitializerArgument (e));
8956
8957 this.loc = loc;
8958 }
8959
8960 public override Expression CreateExpressionTree (ResolveContext ec)
8961 {
8962 Arguments args = new Arguments (2);
8963 args.Add (new Argument (mg.CreateExpressionTree (ec)));
8964
8965 var expr_initializers = new ArrayInitializer (arguments.Count, loc);
8966 foreach (Argument a in arguments)
8967 expr_initializers.Add (a.CreateExpressionTree (ec));
8968
8969 args.Add (new Argument (new ArrayCreation (
8970 CreateExpressionTypeExpression (ec, loc), "[]", expr_initializers, loc)));
8971 return CreateExpressionFactoryCall (ec, "ElementInit", args);
8972 }
8973
8974 protected override void CloneTo (CloneContext clonectx, Expression t)
8975 {
8976 CollectionElementInitializer target = (CollectionElementInitializer) t;
8977 if (arguments != null)
8978 target.arguments = arguments.Clone (clonectx);
8979 }
8980
8981 protected override Expression DoResolve (ResolveContext ec)
8982 {
8983 base.expr = new AddMemberAccess (ec.CurrentInitializerVariable, loc);
8984
8985 return base.DoResolve (ec);
8986 }
8987 }
8988
8989 //
8990 // A block of object or collection initializers
8991 //
8992 public class CollectionOrObjectInitializers : ExpressionStatement
8993 {
8994 IList<Expression> initializers;
8995 bool is_collection_initialization;
8996
8997 public static readonly CollectionOrObjectInitializers Empty =
8998 new CollectionOrObjectInitializers (Array.AsReadOnly (new Expression [0]), Location.Null);
8999
9000 public CollectionOrObjectInitializers (IList<Expression> initializers, Location loc)
9001 {
9002 this.initializers = initializers;
9003 this.loc = loc;
9004 }
9005
9006 public bool IsEmpty {
9007 get {
9008 return initializers.Count == 0;
9009 }
9010 }
9011
9012 public bool IsCollectionInitializer {
9013 get {
9014 return is_collection_initialization;
9015 }
9016 }
9017
9018 protected override void CloneTo (CloneContext clonectx, Expression target)
9019 {
9020 CollectionOrObjectInitializers t = (CollectionOrObjectInitializers) target;
9021
9022 t.initializers = new List<Expression> (initializers.Count);
9023 foreach (var e in initializers)
9024 t.initializers.Add (e.Clone (clonectx));
9025 }
9026
9027 public override Expression CreateExpressionTree (ResolveContext ec)
9028 {
9029 var expr_initializers = new ArrayInitializer (initializers.Count, loc);
9030 foreach (Expression e in initializers) {
9031 Expression expr = e.CreateExpressionTree (ec);
9032 if (expr != null)
9033 expr_initializers.Add (expr);
9034 }
9035
9036 return new ImplicitlyTypedArrayCreation ("[]", expr_initializers, loc);
9037 }
9038
9039 protected override Expression DoResolve (ResolveContext ec)
9040 {
9041 List<string> element_names = null;
9042 for (int i = 0; i < initializers.Count; ++i) {
9043 Expression initializer = (Expression) initializers [i];
9044 ElementInitializer element_initializer = initializer as ElementInitializer;
9045
9046 if (i == 0) {
9047 if (element_initializer != null) {
9048 element_names = new List<string> (initializers.Count);
9049 element_names.Add (element_initializer.Name);
9050 } else if (initializer is CompletingExpression){
9051 initializer.Resolve (ec);
9052 throw new InternalErrorException ("This line should never be reached");
9053 } else {
9054 if (!ec.CurrentInitializerVariable.Type.ImplementsInterface (TypeManager.ienumerable_type)) {
9055 ec.Report.Error (1922, loc, "A field or property `{0}' cannot be initialized with a collection " +
9056 "object initializer because type `{1}' does not implement `{2}' interface",
9057 ec.CurrentInitializerVariable.GetSignatureForError (),
9058 TypeManager.CSharpName (ec.CurrentInitializerVariable.Type),
9059 TypeManager.CSharpName (TypeManager.ienumerable_type));
9060 return null;
9061 }
9062 is_collection_initialization = true;
9063 }
9064 } else {
9065 if (is_collection_initialization != (element_initializer == null)) {
9066 ec.Report.Error (747, initializer.Location, "Inconsistent `{0}' member declaration",
9067 is_collection_initialization ? "collection initializer" : "object initializer");
9068 continue;
9069 }
9070
9071 if (!is_collection_initialization) {
9072 if (element_names.Contains (element_initializer.Name)) {
9073 ec.Report.Error (1912, element_initializer.Location,
9074 "An object initializer includes more than one member `{0}' initialization",
9075 element_initializer.Name);
9076 } else {
9077 element_names.Add (element_initializer.Name);
9078 }
9079 }
9080 }
9081
9082 Expression e = initializer.Resolve (ec);
9083 if (e == EmptyExpressionStatement.Instance)
9084 initializers.RemoveAt (i--);
9085 else
9086 initializers [i] = e;
9087 }
9088
9089 type = ec.CurrentInitializerVariable.Type;
9090 if (is_collection_initialization) {
9091 if (TypeManager.HasElementType (type)) {
9092 ec.Report.Error (1925, loc, "Cannot initialize object of type `{0}' with a collection initializer",
9093 TypeManager.CSharpName (type));
9094 }
9095 }
9096
9097 eclass = ExprClass.Variable;
9098 return this;
9099 }
9100
9101 public override void Emit (EmitContext ec)
9102 {
9103 EmitStatement (ec);
9104 }
9105
9106 public override void EmitStatement (EmitContext ec)
9107 {
9108 foreach (ExpressionStatement e in initializers)
9109 e.EmitStatement (ec);
9110 }
9111 }
9112
9113 //
9114 // New expression with element/object initializers
9115 //
9116 public class NewInitialize : New
9117 {
9118 //
9119 // This class serves as a proxy for variable initializer target instances.
9120 // A real variable is assigned later when we resolve left side of an
9121 // assignment
9122 //
9123 sealed class InitializerTargetExpression : Expression, IMemoryLocation
9124 {
9125 NewInitialize new_instance;
9126
9127 public InitializerTargetExpression (NewInitialize newInstance)
9128 {
9129 this.type = newInstance.type;
9130 this.loc = newInstance.loc;
9131 this.eclass = newInstance.eclass;
9132 this.new_instance = newInstance;
9133 }
9134
9135 public override Expression CreateExpressionTree (ResolveContext ec)
9136 {
9137 // Should not be reached
9138 throw new NotSupportedException ("ET");
9139 }
9140
9141 protected override Expression DoResolve (ResolveContext ec)
9142 {
9143 return this;
9144 }
9145
9146 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
9147 {
9148 return this;
9149 }
9150
9151 public override void Emit (EmitContext ec)
9152 {
9153 Expression e = (Expression) new_instance.instance;
9154 e.Emit (ec);
9155 }
9156
9157 #region IMemoryLocation Members
9158
9159 public void AddressOf (EmitContext ec, AddressOp mode)
9160 {
9161 new_instance.instance.AddressOf (ec, mode);
9162 }
9163
9164 #endregion
9165 }
9166
9167 CollectionOrObjectInitializers initializers;
9168 IMemoryLocation instance;
9169
9170 public NewInitialize (Expression requested_type, Arguments arguments, CollectionOrObjectInitializers initializers, Location l)
9171 : base (requested_type, arguments, l)
9172 {
9173 this.initializers = initializers;
9174 }
9175
9176 protected override IMemoryLocation EmitAddressOf (EmitContext ec, AddressOp Mode)
9177 {
9178 instance = base.EmitAddressOf (ec, Mode);
9179
9180 if (!initializers.IsEmpty)
9181 initializers.Emit (ec);
9182
9183 return instance;
9184 }
9185
9186 protected override void CloneTo (CloneContext clonectx, Expression t)
9187 {
9188 base.CloneTo (clonectx, t);
9189
9190 NewInitialize target = (NewInitialize) t;
9191 target.initializers = (CollectionOrObjectInitializers) initializers.Clone (clonectx);
9192 }
9193
9194 public override Expression CreateExpressionTree (ResolveContext ec)
9195 {
9196 Arguments args = new Arguments (2);
9197 args.Add (new Argument (base.CreateExpressionTree (ec)));
9198 if (!initializers.IsEmpty)
9199 args.Add (new Argument (initializers.CreateExpressionTree (ec)));
9200
9201 return CreateExpressionFactoryCall (ec,
9202 initializers.IsCollectionInitializer ? "ListInit" : "MemberInit",
9203 args);
9204 }
9205
9206 protected override Expression DoResolve (ResolveContext ec)
9207 {
9208 Expression e = base.DoResolve (ec);
9209 if (type == null)
9210 return null;
9211
9212 Expression previous = ec.CurrentInitializerVariable;
9213 ec.CurrentInitializerVariable = new InitializerTargetExpression (this);
9214 initializers.Resolve (ec);
9215 ec.CurrentInitializerVariable = previous;
9216 return e;
9217 }
9218
9219 public override bool Emit (EmitContext ec, IMemoryLocation target)
9220 {
9221 bool left_on_stack = base.Emit (ec, target);
9222
9223 if (initializers.IsEmpty)
9224 return left_on_stack;
9225
9226 LocalTemporary temp = target as LocalTemporary;
9227 if (temp == null) {
9228 if (!left_on_stack) {
9229 VariableReference vr = target as VariableReference;
9230
9231 // FIXME: This still does not work correctly for pre-set variables
9232 if (vr != null && vr.IsRef)
9233 target.AddressOf (ec, AddressOp.Load);
9234
9235 ((Expression) target).Emit (ec);
9236 left_on_stack = true;
9237 }
9238
9239 temp = new LocalTemporary (type);
9240 }
9241
9242 instance = temp;
9243 if (left_on_stack)
9244 temp.Store (ec);
9245
9246 initializers.Emit (ec);
9247
9248 if (left_on_stack) {
9249 temp.Emit (ec);
9250 temp.Release (ec);
9251 }
9252
9253 return left_on_stack;
9254 }
9255
9256 public override bool HasInitializer {
9257 get {
9258 return !initializers.IsEmpty;
9259 }
9260 }
9261 }
9262
9263 public class NewAnonymousType : New
9264 {
9265 static readonly AnonymousTypeParameter[] EmptyParameters = new AnonymousTypeParameter[0];
9266
9267 List<AnonymousTypeParameter> parameters;
9268 readonly TypeContainer parent;
9269 AnonymousTypeClass anonymous_type;
9270
9271 public NewAnonymousType (List<AnonymousTypeParameter> parameters, TypeContainer parent, Location loc)
9272 : base (null, null, loc)
9273 {
9274 this.parameters = parameters;
9275 this.parent = parent;
9276 }
9277
9278 protected override void CloneTo (CloneContext clonectx, Expression target)
9279 {
9280 if (parameters == null)
9281 return;
9282
9283 NewAnonymousType t = (NewAnonymousType) target;
9284 t.parameters = new List<AnonymousTypeParameter> (parameters.Count);
9285 foreach (AnonymousTypeParameter atp in parameters)
9286 t.parameters.Add ((AnonymousTypeParameter) atp.Clone (clonectx));
9287 }
9288
9289 AnonymousTypeClass CreateAnonymousType (ResolveContext ec, IList<AnonymousTypeParameter> parameters)
9290 {
9291 AnonymousTypeClass type = parent.Module.Compiled.GetAnonymousType (parameters);
9292 if (type != null)
9293 return type;
9294
9295 type = AnonymousTypeClass.Create (ec.Compiler, parent, parameters, loc);
9296 if (type == null)
9297 return null;
9298
9299 type.CreateType ();
9300 type.DefineType ();
9301 type.ResolveTypeParameters ();
9302 type.Define ();
9303 type.EmitType ();
9304 if (ec.Report.Errors == 0)
9305 type.CloseType ();
9306
9307 parent.Module.Compiled.AddAnonymousType (type);
9308 return type;
9309 }
9310
9311 public override Expression CreateExpressionTree (ResolveContext ec)
9312 {
9313 if (parameters == null)
9314 return base.CreateExpressionTree (ec);
9315
9316 var init = new ArrayInitializer (parameters.Count, loc);
9317 foreach (Property p in anonymous_type.Properties)
9318 init.Add (new TypeOfMethod (MemberCache.GetMember (type, p.Get.Spec), loc));
9319
9320 var ctor_args = new ArrayInitializer (Arguments.Count, loc);
9321 foreach (Argument a in Arguments)
9322 ctor_args.Add (a.CreateExpressionTree (ec));
9323
9324 Arguments args = new Arguments (3);
9325 args.Add (new Argument (method.CreateExpressionTree (ec)));
9326 args.Add (new Argument (new ArrayCreation (TypeManager.expression_type_expr, "[]", ctor_args, loc)));
9327 args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", init, loc)));
9328
9329 return CreateExpressionFactoryCall (ec, "New", args);
9330 }
9331
9332 protected override Expression DoResolve (ResolveContext ec)
9333 {
9334 if (ec.HasSet (ResolveContext.Options.ConstantScope)) {
9335 ec.Report.Error (836, loc, "Anonymous types cannot be used in this expression");
9336 return null;
9337 }
9338
9339 if (parameters == null) {
9340 anonymous_type = CreateAnonymousType (ec, EmptyParameters);
9341 RequestedType = new TypeExpression (anonymous_type.Definition, loc);
9342 return base.DoResolve (ec);
9343 }
9344
9345 bool error = false;
9346 Arguments = new Arguments (parameters.Count);
9347 TypeExpression [] t_args = new TypeExpression [parameters.Count];
9348 for (int i = 0; i < parameters.Count; ++i) {
9349 Expression e = ((AnonymousTypeParameter) parameters [i]).Resolve (ec);
9350 if (e == null) {
9351 error = true;
9352 continue;
9353 }
9354
9355 Arguments.Add (new Argument (e));
9356 t_args [i] = new TypeExpression (e.Type, e.Location);
9357 }
9358
9359 if (error)
9360 return null;
9361
9362 anonymous_type = CreateAnonymousType (ec, parameters);
9363 if (anonymous_type == null)
9364 return null;
9365
9366 RequestedType = new GenericTypeExpr (anonymous_type.Definition, new TypeArguments (t_args), loc);
9367 return base.DoResolve (ec);
9368 }
9369 }
9370
9371 public class AnonymousTypeParameter : ShimExpression
9372 {
9373 public readonly string Name;
9374
9375 public AnonymousTypeParameter (Expression initializer, string name, Location loc)
9376 : base (initializer)
9377 {
9378 this.Name = name;
9379 this.loc = loc;
9380 }
9381
9382 public AnonymousTypeParameter (Parameter parameter)
9383 : base (new SimpleName (parameter.Name, parameter.Location))
9384 {
9385 this.Name = parameter.Name;
9386 this.loc = parameter.Location;
9387 }
9388
9389 public override bool Equals (object o)
9390 {
9391 AnonymousTypeParameter other = o as AnonymousTypeParameter;
9392 return other != null && Name == other.Name;
9393 }
9394
9395 public override int GetHashCode ()
9396 {
9397 return Name.GetHashCode ();
9398 }
9399
9400 protected override Expression DoResolve (ResolveContext ec)
9401 {
9402 Expression e = expr.Resolve (ec);
9403 if (e == null)
9404 return null;
9405
9406 if (e.eclass == ExprClass.MethodGroup) {
9407 Error_InvalidInitializer (ec, e.ExprClassName);
9408 return null;
9409 }
9410
9411 type = e.Type;
9412 if (type == TypeManager.void_type || type == TypeManager.null_type ||
9413 type == InternalType.AnonymousMethod || type.IsPointer) {
9414 Error_InvalidInitializer (ec, e.GetSignatureForError ());
9415 return null;
9416 }
9417
9418 return e;
9419 }
9420
9421 protected virtual void Error_InvalidInitializer (ResolveContext ec, string initializer)
9422 {
9423 ec.Report.Error (828, loc, "An anonymous type property `{0}' cannot be initialized with `{1}'",
9424 Name, initializer);
9425 }
9426 }
9427 }
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