2 // expression.cs: Expression representation for the IL tree.
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001 Ximian, Inc.
11 // Maybe we should make Resolve be an instance method that just calls
12 // the virtual DoResolve function and checks conditions like the eclass
13 // and type being set if a non-null value is returned. For robustness
19 using System.Collections;
20 using System.Diagnostics;
21 using System.Reflection;
22 using System.Reflection.Emit;
26 // The ExprClass class contains the is used to pass the
27 // classification of an expression (value, variable, namespace,
28 // type, method group, property access, event access, indexer access,
31 public enum ExprClass {
46 // An interface provided by expressions that can be used as
47 // LValues and can store the value on the top of the stack on
50 public interface IStackStore {
53 // The Store method should store the contents of the top
54 // of the stack into the storage that is implemented by
55 // the particular implementation of LValue
57 void Store (EmitContext ec);
61 // This interface is implemented by variables
63 public interface IMemoryLocation {
65 // The AddressOf method should generate code that loads
66 // the address of the object and leaves it on the stack
68 void AddressOf (EmitContext ec);
72 // Base class for expressions
74 public abstract class Expression {
75 protected ExprClass eclass;
88 public ExprClass ExprClass {
99 // Utility wrapper routine for Error, just to beautify the code
101 static protected void Error (int error, string s)
103 Report.Error (error, s);
106 static protected void Error (int error, Location loc, string s)
108 Report.Error (error, loc, s);
112 // Utility wrapper routine for Warning, just to beautify the code
114 static protected void Warning (int warning, string s)
116 Report.Warning (warning, s);
120 // Performs semantic analysis on the Expression
124 // The Resolve method is invoked to perform the semantic analysis
127 // The return value is an expression (it can be the
128 // same expression in some cases) or a new
129 // expression that better represents this node.
131 // For example, optimizations of Unary (LiteralInt)
132 // would return a new LiteralInt with a negated
135 // If there is an error during semantic analysis,
136 // then an error should be reported (using Report)
137 // and a null value should be returned.
139 // There are two side effects expected from calling
140 // Resolve(): the the field variable "eclass" should
141 // be set to any value of the enumeration
142 // `ExprClass' and the type variable should be set
143 // to a valid type (this is the type of the
147 public abstract Expression DoResolve (EmitContext ec);
149 public virtual Expression DoResolveLValue (EmitContext ec, Expression right_side)
151 return DoResolve (ec);
155 // Currently Resolve wraps DoResolve to perform sanity
156 // checking and assertion checking on what we expect from Resolve
158 public Expression Resolve (EmitContext ec)
160 Expression e = DoResolve (ec);
166 if (e.ExprClass == ExprClass.Invalid)
167 throw new Exception ("Expression " + e +
168 " ExprClass is Invalid after resolve");
170 if (e.ExprClass != ExprClass.MethodGroup)
172 throw new Exception ("Expression " + e +
173 " did not set its type after Resolve");
180 // Currently ResolveLValue wraps DoResolveLValue to perform sanity
181 // checking and assertion checking on what we expect from Resolve
183 public Expression ResolveLValue (EmitContext ec, Expression right_side)
185 Expression e = DoResolveLValue (ec, right_side);
191 if (e.ExprClass == ExprClass.Invalid)
192 throw new Exception ("Expression " + e +
193 " ExprClass is Invalid after resolve");
195 if (e.ExprClass != ExprClass.MethodGroup)
197 throw new Exception ("Expression " + e +
198 " did not set its type after Resolve");
205 // Emits the code for the expression
210 // The Emit method is invoked to generate the code
211 // for the expression.
214 public abstract void Emit (EmitContext ec);
217 // Protected constructor. Only derivate types should
218 // be able to be created
221 protected Expression ()
223 eclass = ExprClass.Invalid;
228 // Returns a literalized version of a literal FieldInfo
230 static Expression Literalize (FieldInfo fi)
232 Type t = fi.FieldType;
233 object v = fi.GetValue (fi);
235 if (t == TypeManager.int32_type)
236 return new IntLiteral ((int) v);
237 else if (t == TypeManager.uint32_type)
238 return new UIntLiteral ((uint) v);
239 else if (t == TypeManager.int64_type)
240 return new LongLiteral ((long) v);
241 else if (t == TypeManager.uint64_type)
242 return new ULongLiteral ((ulong) v);
243 else if (t == TypeManager.float_type)
244 return new FloatLiteral ((float) v);
245 else if (t == TypeManager.double_type)
246 return new DoubleLiteral ((double) v);
247 else if (t == TypeManager.string_type)
248 return new StringLiteral ((string) v);
249 else if (t == TypeManager.short_type)
250 return new IntLiteral ((int) ((short)v));
251 else if (t == TypeManager.ushort_type)
252 return new IntLiteral ((int) ((ushort)v));
253 else if (t == TypeManager.sbyte_type)
254 return new IntLiteral ((int) ((sbyte)v));
255 else if (t == TypeManager.byte_type)
256 return new IntLiteral ((int) ((byte)v));
257 else if (t == TypeManager.char_type)
258 return new IntLiteral ((int) ((char)v));
260 throw new Exception ("Unknown type for literal (" + v.GetType () +
261 "), details: " + fi);
265 // Returns a fully formed expression after a MemberLookup
267 static Expression ExprClassFromMemberInfo (EmitContext ec, MemberInfo mi, Location loc)
269 if (mi is EventInfo){
270 return new EventExpr ((EventInfo) mi, loc);
271 } else if (mi is FieldInfo){
272 FieldInfo fi = (FieldInfo) mi;
275 Expression e = Literalize (fi);
280 return new FieldExpr (fi, loc);
281 } else if (mi is PropertyInfo){
282 return new PropertyExpr ((PropertyInfo) mi, loc);
283 } else if (mi is Type)
284 return new TypeExpr ((Type) mi);
290 // FIXME: Probably implement a cache for (t,name,current_access_set)?
292 // FIXME: We need to cope with access permissions here, or this wont
295 // This code could use some optimizations, but we need to do some
296 // measurements. For example, we could use a delegate to `flag' when
297 // something can not any longer be a method-group (because it is something
301 // If the return value is an Array, then it is an array of
304 // If the return value is an MemberInfo, it is anything, but a Method
308 // FIXME: When calling MemberLookup inside an `Invocation', we should pass
309 // the arguments here and have MemberLookup return only the methods that
310 // match the argument count/type, unlike we are doing now (we delay this
313 // This is so we can catch correctly attempts to invoke instance methods
314 // from a static body (scan for error 120 in ResolveSimpleName).
316 public static Expression MemberLookup (EmitContext ec, Type t, string name,
317 bool same_type, MemberTypes mt,
318 BindingFlags bf, Location loc)
321 bf |= BindingFlags.NonPublic;
323 MemberInfo [] mi = ec.TypeContainer.RootContext.TypeManager.FindMembers (
324 t, mt, bf, Type.FilterName, name);
329 // FIXME : How does this wierd case arise ?
333 if (mi.Length == 1 && !(mi [0] is MethodBase))
334 return Expression.ExprClassFromMemberInfo (ec, mi [0], loc);
336 for (int i = 0; i < mi.Length; i++)
337 if (!(mi [i] is MethodBase)){
338 Error (-5, "Do not know how to reproduce this case: " +
339 "Methods and non-Method with the same name, " +
340 "report this please");
342 for (i = 0; i < mi.Length; i++){
343 Type tt = mi [i].GetType ();
345 Console.WriteLine (i + ": " + mi [i]);
346 while (tt != TypeManager.object_type){
347 Console.WriteLine (tt);
353 return new MethodGroupExpr (mi);
356 public const MemberTypes AllMemberTypes =
357 MemberTypes.Constructor |
361 MemberTypes.NestedType |
362 MemberTypes.Property;
364 public const BindingFlags AllBindingsFlags =
365 BindingFlags.Public |
366 BindingFlags.Static |
367 BindingFlags.Instance;
369 public static Expression MemberLookup (EmitContext ec, Type t, string name,
370 bool same_type, Location loc)
372 return MemberLookup (ec, t, name, same_type, AllMemberTypes, AllBindingsFlags, loc);
375 static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
377 Type expr_type = expr.Type;
379 if (target_type == TypeManager.object_type) {
380 if (expr_type.IsClass)
381 return new EmptyCast (expr, target_type);
382 if (expr_type.IsValueType)
383 return new BoxedCast (expr);
384 } else if (expr_type.IsSubclassOf (target_type)) {
385 return new EmptyCast (expr, target_type);
387 // from any class-type S to any interface-type T.
388 if (expr_type.IsClass && target_type.IsInterface) {
389 Type [] interfaces = expr_type.FindInterfaces (Module.FilterTypeName,
390 target_type.FullName);
391 if (interfaces != null)
392 return new EmptyCast (expr, target_type);
395 // from any interface type S to interface-type T.
396 // FIXME : Is it right to use IsAssignableFrom ?
397 if (expr_type.IsInterface && target_type.IsInterface)
398 if (target_type.IsAssignableFrom (expr_type))
399 return new EmptyCast (expr, target_type);
402 // from an array-type S to an array-type of type T
403 if (expr_type.IsArray && target_type.IsArray) {
404 if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
406 Type expr_element_type = expr_type.GetElementType ();
407 Type target_element_type = target_type.GetElementType ();
409 if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
410 if (StandardConversionExists (expr_element_type,
411 target_element_type))
412 return new EmptyCast (expr, target_type);
417 // from an array-type to System.Array
418 if (expr_type.IsArray && target_type.IsAssignableFrom (expr_type))
419 return new EmptyCast (expr, target_type);
421 // from any delegate type to System.Delegate
422 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
423 target_type == TypeManager.delegate_type)
424 if (target_type.IsAssignableFrom (expr_type))
425 return new EmptyCast (expr, target_type);
427 // from any array-type or delegate type into System.ICloneable.
428 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
429 if (target_type == TypeManager.icloneable_type)
430 return new EmptyCast (expr, target_type);
432 // from the null type to any reference-type.
433 if (expr is NullLiteral)
434 return new EmptyCast (expr, target_type);
444 // Handles expressions like this: decimal d; d = 1;
445 // and changes them into: decimal d; d = new System.Decimal (1);
447 static Expression InternalTypeConstructor (EmitContext ec, Expression expr, Type target)
449 ArrayList args = new ArrayList ();
451 args.Add (new Argument (expr, Argument.AType.Expression));
453 Expression ne = new New (target.FullName, args,
456 return ne.Resolve (ec);
460 // Implicit Numeric Conversions.
462 // expr is the expression to convert, returns a new expression of type
463 // target_type or null if an implicit conversion is not possible.
466 static public Expression ImplicitNumericConversion (EmitContext ec, Expression expr,
467 Type target_type, Location loc)
469 Type expr_type = expr.Type;
472 // Attempt to do the implicit constant expression conversions
474 if (expr is IntLiteral){
477 e = TryImplicitIntConversion (target_type, (IntLiteral) expr);
480 } else if (expr is LongLiteral){
482 // Try the implicit constant expression conversion
483 // from long to ulong, instead of a nice routine,
486 if (((LongLiteral) expr).Value > 0)
487 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
490 if (expr_type == TypeManager.sbyte_type){
492 // From sbyte to short, int, long, float, double.
494 if (target_type == TypeManager.int32_type)
495 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
496 if (target_type == TypeManager.int64_type)
497 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
498 if (target_type == TypeManager.double_type)
499 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
500 if (target_type == TypeManager.float_type)
501 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
502 if (target_type == TypeManager.short_type)
503 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
504 if (target_type == TypeManager.decimal_type)
505 return InternalTypeConstructor (ec, expr, target_type);
506 } else if (expr_type == TypeManager.byte_type){
508 // From byte to short, ushort, int, uint, long, ulong, float, double
510 if ((target_type == TypeManager.short_type) ||
511 (target_type == TypeManager.ushort_type) ||
512 (target_type == TypeManager.int32_type) ||
513 (target_type == TypeManager.uint32_type))
514 return new EmptyCast (expr, target_type);
516 if (target_type == TypeManager.uint64_type)
517 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
518 if (target_type == TypeManager.int64_type)
519 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
521 if (target_type == TypeManager.float_type)
522 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
523 if (target_type == TypeManager.double_type)
524 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
525 if (target_type == TypeManager.decimal_type)
526 return InternalTypeConstructor (ec, expr, target_type);
527 } else if (expr_type == TypeManager.short_type){
529 // From short to int, long, float, double
531 if (target_type == TypeManager.int32_type)
532 return new EmptyCast (expr, target_type);
533 if (target_type == TypeManager.int64_type)
534 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
535 if (target_type == TypeManager.double_type)
536 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
537 if (target_type == TypeManager.float_type)
538 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
539 if (target_type == TypeManager.decimal_type)
540 return InternalTypeConstructor (ec, expr, target_type);
541 } else if (expr_type == TypeManager.ushort_type){
543 // From ushort to int, uint, long, ulong, float, double
545 if (target_type == TypeManager.uint32_type)
546 return new EmptyCast (expr, target_type);
548 if (target_type == TypeManager.uint64_type)
549 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
550 if (target_type == TypeManager.int32_type)
551 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
552 if (target_type == TypeManager.int64_type)
553 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
554 if (target_type == TypeManager.double_type)
555 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
556 if (target_type == TypeManager.float_type)
557 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
558 if (target_type == TypeManager.decimal_type)
559 return InternalTypeConstructor (ec, expr, target_type);
560 } else if (expr_type == TypeManager.int32_type){
562 // From int to long, float, double
564 if (target_type == TypeManager.int64_type)
565 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
566 if (target_type == TypeManager.double_type)
567 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
568 if (target_type == TypeManager.float_type)
569 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
570 if (target_type == TypeManager.decimal_type)
571 return InternalTypeConstructor (ec, expr, target_type);
572 } else if (expr_type == TypeManager.uint32_type){
574 // From uint to long, ulong, float, double
576 if (target_type == TypeManager.int64_type)
577 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
578 if (target_type == TypeManager.uint64_type)
579 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
580 if (target_type == TypeManager.double_type)
581 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
583 if (target_type == TypeManager.float_type)
584 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
586 if (target_type == TypeManager.decimal_type)
587 return InternalTypeConstructor (ec, expr, target_type);
588 } else if ((expr_type == TypeManager.uint64_type) ||
589 (expr_type == TypeManager.int64_type)){
591 // From long/ulong to float, double
593 if (target_type == TypeManager.double_type)
594 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
596 if (target_type == TypeManager.float_type)
597 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
599 if (target_type == TypeManager.decimal_type)
600 return InternalTypeConstructor (ec, expr, target_type);
601 } else if (expr_type == TypeManager.char_type){
603 // From char to ushort, int, uint, long, ulong, float, double
605 if ((target_type == TypeManager.ushort_type) ||
606 (target_type == TypeManager.int32_type) ||
607 (target_type == TypeManager.uint32_type))
608 return new EmptyCast (expr, target_type);
609 if (target_type == TypeManager.uint64_type)
610 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
611 if (target_type == TypeManager.int64_type)
612 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
613 if (target_type == TypeManager.float_type)
614 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
615 if (target_type == TypeManager.double_type)
616 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
617 if (target_type == TypeManager.decimal_type)
618 return InternalTypeConstructor (ec, expr, target_type);
619 } else if (expr_type == TypeManager.float_type){
623 if (target_type == TypeManager.double_type)
624 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
631 // Determines if a standard implicit conversion exists from
632 // expr_type to target_type
634 public static bool StandardConversionExists (Type expr_type, Type target_type)
636 if (expr_type == target_type)
639 // First numeric conversions
641 if (expr_type == TypeManager.sbyte_type){
643 // From sbyte to short, int, long, float, double.
645 if ((target_type == TypeManager.int32_type) ||
646 (target_type == TypeManager.int64_type) ||
647 (target_type == TypeManager.double_type) ||
648 (target_type == TypeManager.float_type) ||
649 (target_type == TypeManager.short_type) ||
650 (target_type == TypeManager.decimal_type))
653 } else if (expr_type == TypeManager.byte_type){
655 // From byte to short, ushort, int, uint, long, ulong, float, double
657 if ((target_type == TypeManager.short_type) ||
658 (target_type == TypeManager.ushort_type) ||
659 (target_type == TypeManager.int32_type) ||
660 (target_type == TypeManager.uint32_type) ||
661 (target_type == TypeManager.uint64_type) ||
662 (target_type == TypeManager.int64_type) ||
663 (target_type == TypeManager.float_type) ||
664 (target_type == TypeManager.double_type) ||
665 (target_type == TypeManager.decimal_type))
668 } else if (expr_type == TypeManager.short_type){
670 // From short to int, long, float, double
672 if ((target_type == TypeManager.int32_type) ||
673 (target_type == TypeManager.int64_type) ||
674 (target_type == TypeManager.double_type) ||
675 (target_type == TypeManager.float_type) ||
676 (target_type == TypeManager.decimal_type))
679 } else if (expr_type == TypeManager.ushort_type){
681 // From ushort to int, uint, long, ulong, float, double
683 if ((target_type == TypeManager.uint32_type) ||
684 (target_type == TypeManager.uint64_type) ||
685 (target_type == TypeManager.int32_type) ||
686 (target_type == TypeManager.int64_type) ||
687 (target_type == TypeManager.double_type) ||
688 (target_type == TypeManager.float_type) ||
689 (target_type == TypeManager.decimal_type))
692 } else if (expr_type == TypeManager.int32_type){
694 // From int to long, float, double
696 if ((target_type == TypeManager.int64_type) ||
697 (target_type == TypeManager.double_type) ||
698 (target_type == TypeManager.float_type) ||
699 (target_type == TypeManager.decimal_type))
702 } else if (expr_type == TypeManager.uint32_type){
704 // From uint to long, ulong, float, double
706 if ((target_type == TypeManager.int64_type) ||
707 (target_type == TypeManager.uint64_type) ||
708 (target_type == TypeManager.double_type) ||
709 (target_type == TypeManager.float_type) ||
710 (target_type == TypeManager.decimal_type))
713 } else if ((expr_type == TypeManager.uint64_type) ||
714 (expr_type == TypeManager.int64_type)) {
716 // From long/ulong to float, double
718 if ((target_type == TypeManager.double_type) ||
719 (target_type == TypeManager.float_type) ||
720 (target_type == TypeManager.decimal_type))
723 } else if (expr_type == TypeManager.char_type){
725 // From char to ushort, int, uint, long, ulong, float, double
727 if ((target_type == TypeManager.ushort_type) ||
728 (target_type == TypeManager.int32_type) ||
729 (target_type == TypeManager.uint32_type) ||
730 (target_type == TypeManager.uint64_type) ||
731 (target_type == TypeManager.int64_type) ||
732 (target_type == TypeManager.float_type) ||
733 (target_type == TypeManager.double_type) ||
734 (target_type == TypeManager.decimal_type))
737 } else if (expr_type == TypeManager.float_type){
741 if (target_type == TypeManager.double_type)
745 // Next reference conversions
747 if (target_type == TypeManager.object_type) {
748 if ((expr_type.IsClass) ||
749 (expr_type.IsValueType))
752 } else if (expr_type.IsSubclassOf (target_type)) {
756 // from any class-type S to any interface-type T.
757 if (expr_type.IsClass && target_type.IsInterface)
760 // from any interface type S to interface-type T.
761 // FIXME : Is it right to use IsAssignableFrom ?
762 if (expr_type.IsInterface && target_type.IsInterface)
763 if (target_type.IsAssignableFrom (expr_type))
766 // from an array-type S to an array-type of type T
767 if (expr_type.IsArray && target_type.IsArray) {
768 if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
770 Type expr_element_type = expr_type.GetElementType ();
771 Type target_element_type = target_type.GetElementType ();
773 if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
774 if (StandardConversionExists (expr_element_type,
775 target_element_type))
780 // from an array-type to System.Array
781 if (expr_type.IsArray && target_type.IsAssignableFrom (expr_type))
784 // from any delegate type to System.Delegate
785 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
786 target_type == TypeManager.delegate_type)
787 if (target_type.IsAssignableFrom (expr_type))
790 // from any array-type or delegate type into System.ICloneable.
791 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
792 if (target_type == TypeManager.icloneable_type)
795 // from the null type to any reference-type.
796 // FIXME : How do we do this ?
804 // Finds "most encompassed type" according to the spec (13.4.2)
805 // amongst the methods in the MethodGroupExpr which convert from a
806 // type encompassing source_type
808 static Type FindMostEncompassedType (MethodGroupExpr me, Type source_type)
812 for (int i = me.Methods.Length; i > 0; ) {
815 MethodBase mb = me.Methods [i];
816 ParameterData pd = Invocation.GetParameterData (mb);
817 Type param_type = pd.ParameterType (0);
819 if (StandardConversionExists (source_type, param_type)) {
823 if (StandardConversionExists (param_type, best))
832 // Finds "most encompassing type" according to the spec (13.4.2)
833 // amongst the methods in the MethodGroupExpr which convert to a
834 // type encompassed by target_type
836 static Type FindMostEncompassingType (MethodGroupExpr me, Type target)
840 for (int i = me.Methods.Length; i > 0; ) {
843 MethodInfo mi = (MethodInfo) me.Methods [i];
844 Type ret_type = mi.ReturnType;
846 if (StandardConversionExists (ret_type, target)) {
850 if (!StandardConversionExists (ret_type, best))
862 // User-defined Implicit conversions
864 static public Expression ImplicitUserConversion (EmitContext ec, Expression source,
865 Type target, Location loc)
867 return UserDefinedConversion (ec, source, target, loc, false);
871 // User-defined Explicit conversions
873 static public Expression ExplicitUserConversion (EmitContext ec, Expression source,
874 Type target, Location loc)
876 return UserDefinedConversion (ec, source, target, loc, true);
880 // User-defined conversions
882 static public Expression UserDefinedConversion (EmitContext ec, Expression source,
883 Type target, Location loc,
884 bool look_for_explicit)
886 Expression mg1 = null, mg2 = null, mg3 = null, mg4 = null;
887 Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
889 MethodBase method = null;
890 Type source_type = source.Type;
894 // If we have a boolean type, we need to check for the True operator
896 // FIXME : How does the False operator come into the picture ?
897 // FIXME : This doesn't look complete and very correct !
898 if (target == TypeManager.bool_type)
901 op_name = "op_Implicit";
903 mg1 = MemberLookup (ec, source_type, op_name, false, loc);
905 if (source_type.BaseType != null)
906 mg2 = MemberLookup (ec, source_type.BaseType, op_name, false, loc);
908 mg3 = MemberLookup (ec, target, op_name, false, loc);
910 if (target.BaseType != null)
911 mg4 = MemberLookup (ec, target.BaseType, op_name, false, loc);
913 MethodGroupExpr union1 = Invocation.MakeUnionSet (mg1, mg2);
914 MethodGroupExpr union2 = Invocation.MakeUnionSet (mg3, mg4);
916 MethodGroupExpr union3 = Invocation.MakeUnionSet (union1, union2);
918 MethodGroupExpr union4 = null;
920 if (look_for_explicit) {
922 op_name = "op_Explicit";
924 mg5 = MemberLookup (ec, source_type, op_name, false, loc);
926 if (source_type.BaseType != null)
927 mg6 = MemberLookup (ec, source_type.BaseType, op_name, false, loc);
929 mg7 = MemberLookup (ec, target, op_name, false, loc);
931 if (target.BaseType != null)
932 mg8 = MemberLookup (ec, target.BaseType, op_name, false, loc);
934 MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6);
935 MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8);
937 union4 = Invocation.MakeUnionSet (union5, union6);
940 MethodGroupExpr union = Invocation.MakeUnionSet (union3, union4);
944 Type most_specific_source, most_specific_target;
946 most_specific_source = FindMostEncompassedType (union, source_type);
947 if (most_specific_source == null)
950 most_specific_target = FindMostEncompassingType (union, target);
951 if (most_specific_target == null)
956 for (int i = union.Methods.Length; i > 0;) {
959 MethodBase mb = union.Methods [i];
960 ParameterData pd = Invocation.GetParameterData (mb);
961 MethodInfo mi = (MethodInfo) union.Methods [i];
963 if (pd.ParameterType (0) == most_specific_source &&
964 mi.ReturnType == most_specific_target) {
970 if (method == null || count > 1) {
971 Report.Error (-11, loc, "Ambiguous user defined conversion");
976 // This will do the conversion to the best match that we
977 // found. Now we need to perform an implict standard conversion
978 // if the best match was not the type that we were requested
981 if (look_for_explicit)
982 source = ConvertExplicitStandard (ec, source, most_specific_source, loc);
984 source = ConvertImplicitStandard (ec, source,
985 most_specific_source, loc);
990 e = new UserCast ((MethodInfo) method, source);
992 if (e.Type != target){
993 if (!look_for_explicit)
994 e = ConvertImplicitStandard (ec, e, target, loc);
996 e = ConvertExplicitStandard (ec, e, target, loc);
1007 // Converts implicitly the resolved expression `expr' into the
1008 // `target_type'. It returns a new expression that can be used
1009 // in a context that expects a `target_type'.
1011 static public Expression ConvertImplicit (EmitContext ec, Expression expr,
1012 Type target_type, Location loc)
1014 Type expr_type = expr.Type;
1017 if (expr_type == target_type)
1020 e = ImplicitNumericConversion (ec, expr, target_type, loc);
1024 e = ImplicitReferenceConversion (expr, target_type);
1028 e = ImplicitUserConversion (ec, expr, target_type, loc);
1032 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1033 IntLiteral i = (IntLiteral) expr;
1036 return new EmptyCast (expr, target_type);
1044 // Attempts to apply the `Standard Implicit
1045 // Conversion' rules to the expression `expr' into
1046 // the `target_type'. It returns a new expression
1047 // that can be used in a context that expects a
1050 // This is different from `ConvertImplicit' in that the
1051 // user defined implicit conversions are excluded.
1053 static public Expression ConvertImplicitStandard (EmitContext ec, Expression expr,
1054 Type target_type, Location loc)
1056 Type expr_type = expr.Type;
1059 if (expr_type == target_type)
1062 e = ImplicitNumericConversion (ec, expr, target_type, loc);
1066 e = ImplicitReferenceConversion (expr, target_type);
1070 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1071 IntLiteral i = (IntLiteral) expr;
1074 return new EmptyCast (expr, target_type);
1079 // Attemps to perform an implict constant conversion of the IntLiteral
1080 // into a different data type using casts (See Implicit Constant
1081 // Expression Conversions)
1083 static protected Expression TryImplicitIntConversion (Type target_type, IntLiteral il)
1085 int value = il.Value;
1087 if (target_type == TypeManager.sbyte_type){
1088 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1090 } else if (target_type == TypeManager.byte_type){
1091 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1093 } else if (target_type == TypeManager.short_type){
1094 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1096 } else if (target_type == TypeManager.ushort_type){
1097 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1099 } else if (target_type == TypeManager.uint32_type){
1101 // we can optimize this case: a positive int32
1102 // always fits on a uint32
1106 } else if (target_type == TypeManager.uint64_type){
1108 // we can optimize this case: a positive int32
1109 // always fits on a uint64. But we need an opcode
1113 return new OpcodeCast (il, target_type, OpCodes.Conv_I8);
1120 // Attemptes to implicityly convert `target' into `type', using
1121 // ConvertImplicit. If there is no implicit conversion, then
1122 // an error is signaled
1124 static public Expression ConvertImplicitRequired (EmitContext ec, Expression target,
1125 Type type, Location loc)
1129 e = ConvertImplicit (ec, target, type, loc);
1133 string msg = "Can not convert implicitly from `"+
1134 TypeManager.CSharpName (target.Type) + "' to `" +
1135 TypeManager.CSharpName (type) + "'";
1137 Error (29, loc, msg);
1143 // Performs the explicit numeric conversions
1145 static Expression ConvertNumericExplicit (EmitContext ec, Expression expr,
1148 Type expr_type = expr.Type;
1150 if (expr_type == TypeManager.sbyte_type){
1152 // From sbyte to byte, ushort, uint, ulong, char
1154 if (target_type == TypeManager.byte_type)
1155 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1156 if (target_type == TypeManager.ushort_type)
1157 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1158 if (target_type == TypeManager.uint32_type)
1159 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1160 if (target_type == TypeManager.uint64_type)
1161 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1162 if (target_type == TypeManager.char_type)
1163 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1164 } else if (expr_type == TypeManager.byte_type){
1166 // From byte to sbyte and char
1168 if (target_type == TypeManager.sbyte_type)
1169 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1170 if (target_type == TypeManager.char_type)
1171 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1172 } else if (expr_type == TypeManager.short_type){
1174 // From short to sbyte, byte, ushort, uint, ulong, char
1176 if (target_type == TypeManager.sbyte_type)
1177 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1178 if (target_type == TypeManager.byte_type)
1179 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1180 if (target_type == TypeManager.ushort_type)
1181 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1182 if (target_type == TypeManager.uint32_type)
1183 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1184 if (target_type == TypeManager.uint64_type)
1185 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1186 if (target_type == TypeManager.char_type)
1187 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1188 } else if (expr_type == TypeManager.ushort_type){
1190 // From ushort to sbyte, byte, short, char
1192 if (target_type == TypeManager.sbyte_type)
1193 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1194 if (target_type == TypeManager.byte_type)
1195 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1196 if (target_type == TypeManager.short_type)
1197 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1198 if (target_type == TypeManager.char_type)
1199 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1200 } else if (expr_type == TypeManager.int32_type){
1202 // From int to sbyte, byte, short, ushort, uint, ulong, char
1204 if (target_type == TypeManager.sbyte_type)
1205 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1206 if (target_type == TypeManager.byte_type)
1207 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1208 if (target_type == TypeManager.short_type)
1209 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1210 if (target_type == TypeManager.ushort_type)
1211 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1212 if (target_type == TypeManager.uint32_type)
1213 return new EmptyCast (expr, target_type);
1214 if (target_type == TypeManager.uint64_type)
1215 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1216 if (target_type == TypeManager.char_type)
1217 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1218 } else if (expr_type == TypeManager.uint32_type){
1220 // From uint to sbyte, byte, short, ushort, int, char
1222 if (target_type == TypeManager.sbyte_type)
1223 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1224 if (target_type == TypeManager.byte_type)
1225 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1226 if (target_type == TypeManager.short_type)
1227 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1228 if (target_type == TypeManager.ushort_type)
1229 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1230 if (target_type == TypeManager.int32_type)
1231 return new EmptyCast (expr, target_type);
1232 if (target_type == TypeManager.char_type)
1233 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1234 } else if (expr_type == TypeManager.int64_type){
1236 // From long to sbyte, byte, short, ushort, int, uint, ulong, char
1238 if (target_type == TypeManager.sbyte_type)
1239 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1240 if (target_type == TypeManager.byte_type)
1241 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1242 if (target_type == TypeManager.short_type)
1243 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1244 if (target_type == TypeManager.ushort_type)
1245 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1246 if (target_type == TypeManager.int32_type)
1247 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1248 if (target_type == TypeManager.uint32_type)
1249 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1250 if (target_type == TypeManager.uint64_type)
1251 return new EmptyCast (expr, target_type);
1252 if (target_type == TypeManager.char_type)
1253 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1254 } else if (expr_type == TypeManager.uint64_type){
1256 // From ulong to sbyte, byte, short, ushort, int, uint, long, char
1258 if (target_type == TypeManager.sbyte_type)
1259 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1260 if (target_type == TypeManager.byte_type)
1261 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1262 if (target_type == TypeManager.short_type)
1263 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1264 if (target_type == TypeManager.ushort_type)
1265 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1266 if (target_type == TypeManager.int32_type)
1267 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1268 if (target_type == TypeManager.uint32_type)
1269 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1270 if (target_type == TypeManager.int64_type)
1271 return new EmptyCast (expr, target_type);
1272 if (target_type == TypeManager.char_type)
1273 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1274 } else if (expr_type == TypeManager.char_type){
1276 // From char to sbyte, byte, short
1278 if (target_type == TypeManager.sbyte_type)
1279 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1280 if (target_type == TypeManager.byte_type)
1281 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1282 if (target_type == TypeManager.short_type)
1283 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1284 } else if (expr_type == TypeManager.float_type){
1286 // From float to sbyte, byte, short,
1287 // ushort, int, uint, long, ulong, char
1290 if (target_type == TypeManager.sbyte_type)
1291 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1292 if (target_type == TypeManager.byte_type)
1293 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1294 if (target_type == TypeManager.short_type)
1295 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1296 if (target_type == TypeManager.ushort_type)
1297 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1298 if (target_type == TypeManager.int32_type)
1299 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1300 if (target_type == TypeManager.uint32_type)
1301 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1302 if (target_type == TypeManager.int64_type)
1303 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1304 if (target_type == TypeManager.uint64_type)
1305 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1306 if (target_type == TypeManager.char_type)
1307 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1308 if (target_type == TypeManager.decimal_type)
1309 return InternalTypeConstructor (ec, expr, target_type);
1310 } else if (expr_type == TypeManager.double_type){
1312 // From double to byte, byte, short,
1313 // ushort, int, uint, long, ulong,
1314 // char, float or decimal
1316 if (target_type == TypeManager.sbyte_type)
1317 return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
1318 if (target_type == TypeManager.byte_type)
1319 return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
1320 if (target_type == TypeManager.short_type)
1321 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
1322 if (target_type == TypeManager.ushort_type)
1323 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1324 if (target_type == TypeManager.int32_type)
1325 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
1326 if (target_type == TypeManager.uint32_type)
1327 return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
1328 if (target_type == TypeManager.int64_type)
1329 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
1330 if (target_type == TypeManager.uint64_type)
1331 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
1332 if (target_type == TypeManager.char_type)
1333 return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
1334 if (target_type == TypeManager.float_type)
1335 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
1336 if (target_type == TypeManager.decimal_type)
1337 return InternalTypeConstructor (ec, expr, target_type);
1340 // decimal is taken care of by the op_Explicit methods.
1346 // Returns whether an explicit reference conversion can be performed
1347 // from source_type to target_type
1349 static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
1351 bool target_is_value_type = target_type.IsValueType;
1353 if (source_type == target_type)
1357 // From object to any reference type
1359 if (source_type == TypeManager.object_type && !target_is_value_type)
1363 // From any class S to any class-type T, provided S is a base class of T
1365 if (target_type.IsSubclassOf (source_type))
1369 // From any interface type S to any interface T provided S is not derived from T
1371 if (source_type.IsInterface && target_type.IsInterface){
1372 if (!target_type.IsSubclassOf (source_type))
1377 // From any class type S to any interface T, provides S is not sealed
1378 // and provided S does not implement T.
1380 if (target_type.IsInterface && !source_type.IsSealed &&
1381 !target_type.IsAssignableFrom (source_type))
1385 // From any interface-type S to to any class type T, provided T is not
1386 // sealed, or provided T implements S.
1388 if (source_type.IsInterface &&
1389 (!target_type.IsSealed || source_type.IsAssignableFrom (target_type)))
1392 // From an array type S with an element type Se to an array type T with an
1393 // element type Te provided all the following are true:
1394 // * S and T differe only in element type, in other words, S and T
1395 // have the same number of dimensions.
1396 // * Both Se and Te are reference types
1397 // * An explicit referenc conversions exist from Se to Te
1399 if (source_type.IsArray && target_type.IsArray) {
1400 if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
1402 Type source_element_type = source_type.GetElementType ();
1403 Type target_element_type = target_type.GetElementType ();
1405 if (!source_element_type.IsValueType && !target_element_type.IsValueType)
1406 if (ExplicitReferenceConversionExists (source_element_type,
1407 target_element_type))
1413 // From System.Array to any array-type
1414 if (source_type == TypeManager.array_type &&
1415 target_type.IsSubclassOf (TypeManager.array_type)){
1420 // From System delegate to any delegate-type
1422 if (source_type == TypeManager.delegate_type &&
1423 target_type.IsSubclassOf (TypeManager.delegate_type))
1427 // From ICloneable to Array or Delegate types
1429 if (source_type == TypeManager.icloneable_type &&
1430 (target_type == TypeManager.array_type ||
1431 target_type == TypeManager.delegate_type))
1438 // Implements Explicit Reference conversions
1440 static Expression ConvertReferenceExplicit (Expression source, Type target_type)
1442 Type source_type = source.Type;
1443 bool target_is_value_type = target_type.IsValueType;
1446 // From object to any reference type
1448 if (source_type == TypeManager.object_type && !target_is_value_type)
1449 return new ClassCast (source, target_type);
1453 // From any class S to any class-type T, provided S is a base class of T
1455 if (target_type.IsSubclassOf (source_type))
1456 return new ClassCast (source, target_type);
1459 // From any interface type S to any interface T provided S is not derived from T
1461 if (source_type.IsInterface && target_type.IsInterface){
1462 if (!target_type.IsSubclassOf (source_type))
1463 return new ClassCast (source, target_type);
1467 // From any class type S to any interface T, provides S is not sealed
1468 // and provided S does not implement T.
1470 if (target_type.IsInterface && !source_type.IsSealed &&
1471 !target_type.IsAssignableFrom (source_type))
1472 return new ClassCast (source, target_type);
1475 // From any interface-type S to to any class type T, provided T is not
1476 // sealed, or provided T implements S.
1478 if (source_type.IsInterface &&
1479 (!target_type.IsSealed || source_type.IsAssignableFrom (target_type)))
1480 return new ClassCast (source, target_type);
1482 // From an array type S with an element type Se to an array type T with an
1483 // element type Te provided all the following are true:
1484 // * S and T differe only in element type, in other words, S and T
1485 // have the same number of dimensions.
1486 // * Both Se and Te are reference types
1487 // * An explicit referenc conversions exist from Se to Te
1489 if (source_type.IsArray && target_type.IsArray) {
1490 if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
1492 Type source_element_type = source_type.GetElementType ();
1493 Type target_element_type = target_type.GetElementType ();
1495 if (!source_element_type.IsValueType && !target_element_type.IsValueType)
1496 if (ExplicitReferenceConversionExists (source_element_type,
1497 target_element_type))
1498 return new ClassCast (source, target_type);
1503 // From System.Array to any array-type
1504 if (source_type == TypeManager.array_type &&
1505 target_type.IsSubclassOf (TypeManager.array_type)){
1506 return new ClassCast (source, target_type);
1510 // From System delegate to any delegate-type
1512 if (source_type == TypeManager.delegate_type &&
1513 target_type.IsSubclassOf (TypeManager.delegate_type))
1514 return new ClassCast (source, target_type);
1517 // From ICloneable to Array or Delegate types
1519 if (source_type == TypeManager.icloneable_type &&
1520 (target_type == TypeManager.array_type ||
1521 target_type == TypeManager.delegate_type))
1522 return new ClassCast (source, target_type);
1528 // Performs an explicit conversion of the expression `expr' whose
1529 // type is expr.Type to `target_type'.
1531 static public Expression ConvertExplicit (EmitContext ec, Expression expr,
1532 Type target_type, Location loc)
1534 Expression ne = ConvertImplicitStandard (ec, expr, target_type, loc);
1539 ne = ConvertNumericExplicit (ec, expr, target_type);
1543 ne = ConvertReferenceExplicit (expr, target_type);
1547 ne = ExplicitUserConversion (ec, expr, target_type, loc);
1551 Report.Error (30, loc, "Cannot convert type '" + TypeManager.CSharpName (expr.Type) + "' to '"
1552 + TypeManager.CSharpName (target_type) + "'");
1557 // Same as ConverExplicit, only it doesn't include user defined conversions
1559 static public Expression ConvertExplicitStandard (EmitContext ec, Expression expr,
1560 Type target_type, Location l)
1562 Expression ne = ConvertImplicitStandard (ec, expr, target_type, l);
1567 ne = ConvertNumericExplicit (ec, expr, target_type);
1571 ne = ConvertReferenceExplicit (expr, target_type);
1575 Report.Error (30, l, "Cannot convert type '" +
1576 TypeManager.CSharpName (expr.Type) + "' to '" +
1577 TypeManager.CSharpName (target_type) + "'");
1581 static string ExprClassName (ExprClass c)
1584 case ExprClass.Invalid:
1586 case ExprClass.Value:
1588 case ExprClass.Variable:
1590 case ExprClass.Namespace:
1592 case ExprClass.Type:
1594 case ExprClass.MethodGroup:
1595 return "method group";
1596 case ExprClass.PropertyAccess:
1597 return "property access";
1598 case ExprClass.EventAccess:
1599 return "event access";
1600 case ExprClass.IndexerAccess:
1601 return "indexer access";
1602 case ExprClass.Nothing:
1605 throw new Exception ("Should not happen");
1609 // Reports that we were expecting `expr' to be of class `expected'
1611 protected void report118 (Location loc, Expression expr, string expected)
1613 string kind = "Unknown";
1616 kind = ExprClassName (expr.ExprClass);
1618 Error (118, loc, "Expression denotes a '" + kind +
1619 "' where an " + expected + " was expected");
1624 // This is just a base class for expressions that can
1625 // appear on statements (invocations, object creation,
1626 // assignments, post/pre increment and decrement). The idea
1627 // being that they would support an extra Emition interface that
1628 // does not leave a result on the stack.
1631 public abstract class ExpressionStatement : Expression {
1634 // Requests the expression to be emitted in a `statement'
1635 // context. This means that no new value is left on the
1636 // stack after invoking this method (constrasted with
1637 // Emit that will always leave a value on the stack).
1639 public abstract void EmitStatement (EmitContext ec);
1643 // This kind of cast is used to encapsulate the child
1644 // whose type is child.Type into an expression that is
1645 // reported to return "return_type". This is used to encapsulate
1646 // expressions which have compatible types, but need to be dealt
1647 // at higher levels with.
1649 // For example, a "byte" expression could be encapsulated in one
1650 // of these as an "unsigned int". The type for the expression
1651 // would be "unsigned int".
1655 public class EmptyCast : Expression {
1656 protected Expression child;
1658 public EmptyCast (Expression child, Type return_type)
1660 ExprClass = child.ExprClass;
1665 public override Expression DoResolve (EmitContext ec)
1667 // This should never be invoked, we are born in fully
1668 // initialized state.
1673 public override void Emit (EmitContext ec)
1680 // This kind of cast is used to encapsulate Value Types in objects.
1682 // The effect of it is to box the value type emitted by the previous
1685 public class BoxedCast : EmptyCast {
1687 public BoxedCast (Expression expr)
1688 : base (expr, TypeManager.object_type)
1692 public override Expression DoResolve (EmitContext ec)
1694 // This should never be invoked, we are born in fully
1695 // initialized state.
1700 public override void Emit (EmitContext ec)
1703 ec.ig.Emit (OpCodes.Box, child.Type);
1708 // This kind of cast is used to encapsulate a child expression
1709 // that can be trivially converted to a target type using one or
1710 // two opcodes. The opcodes are passed as arguments.
1712 public class OpcodeCast : EmptyCast {
1716 public OpcodeCast (Expression child, Type return_type, OpCode op)
1717 : base (child, return_type)
1721 second_valid = false;
1724 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
1725 : base (child, return_type)
1730 second_valid = true;
1733 public override Expression DoResolve (EmitContext ec)
1735 // This should never be invoked, we are born in fully
1736 // initialized state.
1741 public override void Emit (EmitContext ec)
1753 // This kind of cast is used to encapsulate a child and cast it
1754 // to the class requested
1756 public class ClassCast : EmptyCast {
1757 public ClassCast (Expression child, Type return_type)
1758 : base (child, return_type)
1763 public override Expression DoResolve (EmitContext ec)
1765 // This should never be invoked, we are born in fully
1766 // initialized state.
1771 public override void Emit (EmitContext ec)
1775 ec.ig.Emit (OpCodes.Castclass, type);
1781 // Unary expressions.
1785 // Unary implements unary expressions. It derives from
1786 // ExpressionStatement becuase the pre/post increment/decrement
1787 // operators can be used in a statement context.
1789 public class Unary : ExpressionStatement {
1790 public enum Operator {
1791 Addition, Subtraction, Negate, BitComplement,
1792 Indirection, AddressOf, PreIncrement,
1793 PreDecrement, PostIncrement, PostDecrement
1798 ArrayList Arguments;
1802 public Unary (Operator op, Expression expr, Location loc)
1809 public Expression Expr {
1819 public Operator Oper {
1830 // Returns a stringified representation of the Operator
1835 case Operator.Addition:
1837 case Operator.Subtraction:
1839 case Operator.Negate:
1841 case Operator.BitComplement:
1843 case Operator.AddressOf:
1845 case Operator.Indirection:
1847 case Operator.PreIncrement : case Operator.PostIncrement :
1849 case Operator.PreDecrement : case Operator.PostDecrement :
1853 return oper.ToString ();
1856 Expression ForceConversion (EmitContext ec, Expression expr, Type target_type)
1858 if (expr.Type == target_type)
1861 return ConvertImplicit (ec, expr, target_type, new Location (-1));
1864 void error23 (Type t)
1867 23, loc, "Operator " + OperName () +
1868 " cannot be applied to operand of type `" +
1869 TypeManager.CSharpName (t) + "'");
1873 // Returns whether an object of type `t' can be incremented
1874 // or decremented with add/sub (ie, basically whether we can
1875 // use pre-post incr-decr operations on it, but it is not a
1876 // System.Decimal, which we test elsewhere)
1878 static bool IsIncrementableNumber (Type t)
1880 return (t == TypeManager.sbyte_type) ||
1881 (t == TypeManager.byte_type) ||
1882 (t == TypeManager.short_type) ||
1883 (t == TypeManager.ushort_type) ||
1884 (t == TypeManager.int32_type) ||
1885 (t == TypeManager.uint32_type) ||
1886 (t == TypeManager.int64_type) ||
1887 (t == TypeManager.uint64_type) ||
1888 (t == TypeManager.char_type) ||
1889 (t.IsSubclassOf (TypeManager.enum_type)) ||
1890 (t == TypeManager.float_type) ||
1891 (t == TypeManager.double_type);
1894 Expression ResolveOperator (EmitContext ec)
1896 Type expr_type = expr.Type;
1899 // Step 1: Perform Operator Overload location
1904 if (oper == Operator.PostIncrement || oper == Operator.PreIncrement)
1905 op_name = "op_Increment";
1906 else if (oper == Operator.PostDecrement || oper == Operator.PreDecrement)
1907 op_name = "op_Decrement";
1909 op_name = "op_" + oper;
1911 mg = MemberLookup (ec, expr_type, op_name, false, loc);
1913 if (mg == null && expr_type.BaseType != null)
1914 mg = MemberLookup (ec, expr_type.BaseType, op_name, false, loc);
1917 Arguments = new ArrayList ();
1918 Arguments.Add (new Argument (expr, Argument.AType.Expression));
1920 method = Invocation.OverloadResolve (ec, (MethodGroupExpr) mg,
1922 if (method != null) {
1923 MethodInfo mi = (MethodInfo) method;
1924 type = mi.ReturnType;
1927 error23 (expr_type);
1934 // Step 2: Default operations on CLI native types.
1937 // Only perform numeric promotions on:
1940 if (expr_type == null)
1943 if (oper == Operator.Negate){
1944 if (expr_type != TypeManager.bool_type) {
1945 error23 (expr.Type);
1949 type = TypeManager.bool_type;
1953 if (oper == Operator.BitComplement) {
1954 if (!((expr_type == TypeManager.int32_type) ||
1955 (expr_type == TypeManager.uint32_type) ||
1956 (expr_type == TypeManager.int64_type) ||
1957 (expr_type == TypeManager.uint64_type) ||
1958 (expr_type.IsSubclassOf (TypeManager.enum_type)))){
1959 error23 (expr.Type);
1966 if (oper == Operator.Addition) {
1968 // A plus in front of something is just a no-op, so return the child.
1974 // Deals with -literals
1975 // int operator- (int x)
1976 // long operator- (long x)
1977 // float operator- (float f)
1978 // double operator- (double d)
1979 // decimal operator- (decimal d)
1981 if (oper == Operator.Subtraction){
1983 // Fold a "- Constant" into a negative constant
1986 Expression e = null;
1989 // Is this a constant?
1991 if (expr is IntLiteral)
1992 e = new IntLiteral (-((IntLiteral) expr).Value);
1993 else if (expr is LongLiteral)
1994 e = new LongLiteral (-((LongLiteral) expr).Value);
1995 else if (expr is FloatLiteral)
1996 e = new FloatLiteral (-((FloatLiteral) expr).Value);
1997 else if (expr is DoubleLiteral)
1998 e = new DoubleLiteral (-((DoubleLiteral) expr).Value);
1999 else if (expr is DecimalLiteral)
2000 e = new DecimalLiteral (-((DecimalLiteral) expr).Value);
2008 // Not a constant we can optimize, perform numeric
2009 // promotions to int, long, double.
2012 // The following is inneficient, because we call
2013 // ConvertImplicit too many times.
2015 // It is also not clear if we should convert to Float
2016 // or Double initially.
2018 if (expr_type == TypeManager.uint32_type){
2020 // FIXME: handle exception to this rule that
2021 // permits the int value -2147483648 (-2^31) to
2022 // bt written as a decimal interger literal
2024 type = TypeManager.int64_type;
2025 expr = ConvertImplicit (ec, expr, type, loc);
2029 if (expr_type == TypeManager.uint64_type){
2031 // FIXME: Handle exception of `long value'
2032 // -92233720368547758087 (-2^63) to be written as
2033 // decimal integer literal.
2035 error23 (expr_type);
2039 e = ConvertImplicit (ec, expr, TypeManager.int32_type, loc);
2046 e = ConvertImplicit (ec, expr, TypeManager.int64_type, loc);
2053 e = ConvertImplicit (ec, expr, TypeManager.double_type, loc);
2060 error23 (expr_type);
2065 // The operand of the prefix/postfix increment decrement operators
2066 // should be an expression that is classified as a variable,
2067 // a property access or an indexer access
2069 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
2070 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
2071 if (expr.ExprClass == ExprClass.Variable){
2072 if (IsIncrementableNumber (expr_type) ||
2073 expr_type == TypeManager.decimal_type){
2077 } else if (expr.ExprClass == ExprClass.IndexerAccess){
2079 // FIXME: Verify that we have both get and set methods
2081 throw new Exception ("Implement me");
2082 } else if (expr.ExprClass == ExprClass.PropertyAccess){
2083 PropertyExpr pe = (PropertyExpr) expr;
2085 if (pe.VerifyAssignable ())
2089 report118 (loc, expr, "variable, indexer or property access");
2093 if (oper == Operator.AddressOf){
2094 if (expr.ExprClass != ExprClass.Variable){
2095 Error (211, "Cannot take the address of non-variables");
2098 type = Type.GetType (expr.Type.ToString () + "*");
2101 Error (187, "No such operator '" + OperName () + "' defined for type '" +
2102 TypeManager.CSharpName (expr_type) + "'");
2107 public override Expression DoResolve (EmitContext ec)
2109 expr = expr.Resolve (ec);
2114 eclass = ExprClass.Value;
2115 return ResolveOperator (ec);
2118 public override void Emit (EmitContext ec)
2120 ILGenerator ig = ec.ig;
2121 Type expr_type = expr.Type;
2124 if (method != null) {
2126 // Note that operators are static anyway
2128 if (Arguments != null)
2129 Invocation.EmitArguments (ec, method, Arguments);
2132 // Post increment/decrement operations need a copy at this
2135 if (oper == Operator.PostDecrement || oper == Operator.PostIncrement)
2136 ig.Emit (OpCodes.Dup);
2139 ig.Emit (OpCodes.Call, (MethodInfo) method);
2142 // Pre Increment and Decrement operators
2144 if (oper == Operator.PreIncrement || oper == Operator.PreDecrement){
2145 ig.Emit (OpCodes.Dup);
2149 // Increment and Decrement should store the result
2151 if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
2152 oper == Operator.PostDecrement || oper == Operator.PostIncrement){
2153 ((IStackStore) expr).Store (ec);
2159 case Operator.Addition:
2160 throw new Exception ("This should be caught by Resolve");
2162 case Operator.Subtraction:
2164 ig.Emit (OpCodes.Neg);
2167 case Operator.Negate:
2169 ig.Emit (OpCodes.Ldc_I4_0);
2170 ig.Emit (OpCodes.Ceq);
2173 case Operator.BitComplement:
2175 ig.Emit (OpCodes.Not);
2178 case Operator.AddressOf:
2179 ((IMemoryLocation)expr).AddressOf (ec);
2182 case Operator.Indirection:
2183 throw new Exception ("Not implemented yet");
2185 case Operator.PreIncrement:
2186 case Operator.PreDecrement:
2187 if (expr.ExprClass == ExprClass.Variable){
2189 // Resolve already verified that it is an "incrementable"
2192 ig.Emit (OpCodes.Ldc_I4_1);
2194 if (oper == Operator.PreDecrement)
2195 ig.Emit (OpCodes.Sub);
2197 ig.Emit (OpCodes.Add);
2198 ig.Emit (OpCodes.Dup);
2199 ((IStackStore) expr).Store (ec);
2201 throw new Exception ("Handle Indexers and Properties here");
2205 case Operator.PostIncrement:
2206 case Operator.PostDecrement:
2207 eclass = expr.ExprClass;
2208 if (eclass == ExprClass.Variable){
2210 // Resolve already verified that it is an "incrementable"
2213 ig.Emit (OpCodes.Dup);
2214 ig.Emit (OpCodes.Ldc_I4_1);
2216 if (oper == Operator.PostDecrement)
2217 ig.Emit (OpCodes.Sub);
2219 ig.Emit (OpCodes.Add);
2220 ((IStackStore) expr).Store (ec);
2221 } else if (eclass == ExprClass.PropertyAccess){
2222 throw new Exception ("Handle Properties here");
2223 } else if (eclass == ExprClass.IndexerAccess) {
2224 throw new Exception ("Handle Indexers here");
2226 Console.WriteLine ("Unknown exprclass: " + eclass);
2231 throw new Exception ("This should not happen: Operator = "
2232 + oper.ToString ());
2237 public override void EmitStatement (EmitContext ec)
2240 // FIXME: we should rewrite this code to generate
2241 // better code for ++ and -- as we know we wont need
2242 // the values on the stack
2245 ec.ig.Emit (OpCodes.Pop);
2249 public class Probe : Expression {
2250 public readonly string ProbeType;
2251 public readonly Operator Oper;
2255 public enum Operator {
2259 public Probe (Operator oper, Expression expr, string probe_type)
2262 ProbeType = probe_type;
2266 public Expression Expr {
2272 public override Expression DoResolve (EmitContext ec)
2274 probe_type = ec.TypeContainer.LookupType (ProbeType, false);
2276 if (probe_type == null)
2279 expr = expr.Resolve (ec);
2281 type = TypeManager.bool_type;
2282 eclass = ExprClass.Value;
2287 public override void Emit (EmitContext ec)
2289 ILGenerator ig = ec.ig;
2293 if (Oper == Operator.Is){
2294 ig.Emit (OpCodes.Isinst, probe_type);
2295 ig.Emit (OpCodes.Ldnull);
2296 ig.Emit (OpCodes.Cgt_Un);
2298 ig.Emit (OpCodes.Isinst, probe_type);
2304 // This represents a typecast in the source language.
2306 // FIXME: Cast expressions have an unusual set of parsing
2307 // rules, we need to figure those out.
2309 public class Cast : Expression {
2314 public Cast (string cast_type, Expression expr, Location loc)
2316 this.target_type = cast_type;
2321 public string TargetType {
2327 public Expression Expr {
2336 public override Expression DoResolve (EmitContext ec)
2338 expr = expr.Resolve (ec);
2342 type = ec.TypeContainer.LookupType (target_type, false);
2343 eclass = ExprClass.Value;
2348 expr = ConvertExplicit (ec, expr, type, loc);
2353 public override void Emit (EmitContext ec)
2356 // This one will never happen
2358 throw new Exception ("Should not happen");
2362 public class Binary : Expression {
2363 public enum Operator {
2364 Multiply, Division, Modulus,
2365 Addition, Subtraction,
2366 LeftShift, RightShift,
2367 LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
2368 Equality, Inequality,
2377 Expression left, right;
2379 ArrayList Arguments;
2383 public Binary (Operator oper, Expression left, Expression right, Location loc)
2391 public Operator Oper {
2400 public Expression Left {
2409 public Expression Right {
2420 // Returns a stringified representation of the Operator
2425 case Operator.Multiply:
2427 case Operator.Division:
2429 case Operator.Modulus:
2431 case Operator.Addition:
2433 case Operator.Subtraction:
2435 case Operator.LeftShift:
2437 case Operator.RightShift:
2439 case Operator.LessThan:
2441 case Operator.GreaterThan:
2443 case Operator.LessThanOrEqual:
2445 case Operator.GreaterThanOrEqual:
2447 case Operator.Equality:
2449 case Operator.Inequality:
2451 case Operator.BitwiseAnd:
2453 case Operator.BitwiseOr:
2455 case Operator.ExclusiveOr:
2457 case Operator.LogicalOr:
2459 case Operator.LogicalAnd:
2463 return oper.ToString ();
2466 Expression ForceConversion (EmitContext ec, Expression expr, Type target_type)
2468 if (expr.Type == target_type)
2471 return ConvertImplicit (ec, expr, target_type, new Location (-1));
2475 // Note that handling the case l == Decimal || r == Decimal
2476 // is taken care of by the Step 1 Operator Overload resolution.
2478 void DoNumericPromotions (EmitContext ec, Type l, Type r)
2480 if (l == TypeManager.double_type || r == TypeManager.double_type){
2482 // If either operand is of type double, the other operand is
2483 // conveted to type double.
2485 if (r != TypeManager.double_type)
2486 right = ConvertImplicit (ec, right, TypeManager.double_type, loc);
2487 if (l != TypeManager.double_type)
2488 left = ConvertImplicit (ec, left, TypeManager.double_type, loc);
2490 type = TypeManager.double_type;
2491 } else if (l == TypeManager.float_type || r == TypeManager.float_type){
2493 // if either operand is of type float, th eother operand is
2494 // converd to type float.
2496 if (r != TypeManager.double_type)
2497 right = ConvertImplicit (ec, right, TypeManager.float_type, loc);
2498 if (l != TypeManager.double_type)
2499 left = ConvertImplicit (ec, left, TypeManager.float_type, loc);
2500 type = TypeManager.float_type;
2501 } else if (l == TypeManager.uint64_type || r == TypeManager.uint64_type){
2505 // If either operand is of type ulong, the other operand is
2506 // converted to type ulong. or an error ocurrs if the other
2507 // operand is of type sbyte, short, int or long
2510 if (l == TypeManager.uint64_type){
2511 if (r != TypeManager.uint64_type && right is IntLiteral){
2512 e = TryImplicitIntConversion (l, (IntLiteral) right);
2518 if (left is IntLiteral){
2519 e = TryImplicitIntConversion (r, (IntLiteral) left);
2526 if ((other == TypeManager.sbyte_type) ||
2527 (other == TypeManager.short_type) ||
2528 (other == TypeManager.int32_type) ||
2529 (other == TypeManager.int64_type)){
2530 string oper = OperName ();
2532 Error (34, loc, "Operator `" + OperName ()
2533 + "' is ambiguous on operands of type `"
2534 + TypeManager.CSharpName (l) + "' "
2535 + "and `" + TypeManager.CSharpName (r)
2538 type = TypeManager.uint64_type;
2539 } else if (l == TypeManager.int64_type || r == TypeManager.int64_type){
2541 // If either operand is of type long, the other operand is converted
2544 if (l != TypeManager.int64_type)
2545 left = ConvertImplicit (ec, left, TypeManager.int64_type, loc);
2546 if (r != TypeManager.int64_type)
2547 right = ConvertImplicit (ec, right, TypeManager.int64_type, loc);
2549 type = TypeManager.int64_type;
2550 } else if (l == TypeManager.uint32_type || r == TypeManager.uint32_type){
2552 // If either operand is of type uint, and the other
2553 // operand is of type sbyte, short or int, othe operands are
2554 // converted to type long.
2558 if (l == TypeManager.uint32_type)
2560 else if (r == TypeManager.uint32_type)
2563 if ((other == TypeManager.sbyte_type) ||
2564 (other == TypeManager.short_type) ||
2565 (other == TypeManager.int32_type)){
2566 left = ForceConversion (ec, left, TypeManager.int64_type);
2567 right = ForceConversion (ec, right, TypeManager.int64_type);
2568 type = TypeManager.int64_type;
2571 // if either operand is of type uint, the other
2572 // operand is converd to type uint
2574 left = ForceConversion (ec, left, TypeManager.uint32_type);
2575 right = ForceConversion (ec, right, TypeManager.uint32_type);
2576 type = TypeManager.uint32_type;
2578 } else if (l == TypeManager.decimal_type || r == TypeManager.decimal_type){
2579 if (l != TypeManager.decimal_type)
2580 left = ConvertImplicit (ec, left, TypeManager.decimal_type, loc);
2581 if (r != TypeManager.decimal_type)
2582 right = ConvertImplicit (ec, right, TypeManager.decimal_type, loc);
2584 type = TypeManager.decimal_type;
2586 Expression l_tmp, r_tmp;
2588 l_tmp = ForceConversion (ec, left, TypeManager.int32_type);
2589 if (l_tmp == null) {
2595 r_tmp = ForceConversion (ec, right, TypeManager.int32_type);
2596 if (r_tmp == null) {
2602 type = TypeManager.int32_type;
2609 "Operator " + OperName () + " cannot be applied to operands of type `" +
2610 TypeManager.CSharpName (left.Type) + "' and `" +
2611 TypeManager.CSharpName (right.Type) + "'");
2615 Expression CheckShiftArguments (EmitContext ec)
2619 Type r = right.Type;
2621 e = ForceConversion (ec, right, TypeManager.int32_type);
2628 if (((e = ConvertImplicit (ec, left, TypeManager.int32_type, loc)) != null) ||
2629 ((e = ConvertImplicit (ec, left, TypeManager.uint32_type, loc)) != null) ||
2630 ((e = ConvertImplicit (ec, left, TypeManager.int64_type, loc)) != null) ||
2631 ((e = ConvertImplicit (ec, left, TypeManager.uint64_type, loc)) != null)){
2641 Expression ResolveOperator (EmitContext ec)
2644 Type r = right.Type;
2647 // Step 1: Perform Operator Overload location
2649 Expression left_expr, right_expr;
2651 string op = "op_" + oper;
2653 left_expr = MemberLookup (ec, l, op, false, loc);
2654 if (left_expr == null && l.BaseType != null)
2655 left_expr = MemberLookup (ec, l.BaseType, op, false, loc);
2657 right_expr = MemberLookup (ec, r, op, false, loc);
2658 if (right_expr == null && r.BaseType != null)
2659 right_expr = MemberLookup (ec, r.BaseType, op, false, loc);
2661 MethodGroupExpr union = Invocation.MakeUnionSet (left_expr, right_expr);
2663 if (union != null) {
2664 Arguments = new ArrayList ();
2665 Arguments.Add (new Argument (left, Argument.AType.Expression));
2666 Arguments.Add (new Argument (right, Argument.AType.Expression));
2668 method = Invocation.OverloadResolve (ec, union, Arguments, loc);
2669 if (method != null) {
2670 MethodInfo mi = (MethodInfo) method;
2671 type = mi.ReturnType;
2680 // Step 2: Default operations on CLI native types.
2683 // Only perform numeric promotions on:
2684 // +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
2686 if (oper == Operator.Addition){
2688 // If any of the arguments is a string, cast to string
2690 if (l == TypeManager.string_type){
2691 if (r == TypeManager.string_type){
2693 method = TypeManager.string_concat_string_string;
2696 method = TypeManager.string_concat_object_object;
2697 right = ConvertImplicit (ec, right,
2698 TypeManager.object_type, loc);
2700 type = TypeManager.string_type;
2702 Arguments = new ArrayList ();
2703 Arguments.Add (new Argument (left, Argument.AType.Expression));
2704 Arguments.Add (new Argument (right, Argument.AType.Expression));
2708 } else if (r == TypeManager.string_type){
2710 method = TypeManager.string_concat_object_object;
2711 Arguments = new ArrayList ();
2712 Arguments.Add (new Argument (left, Argument.AType.Expression));
2713 Arguments.Add (new Argument (right, Argument.AType.Expression));
2715 left = ConvertImplicit (ec, left, TypeManager.object_type, loc);
2716 type = TypeManager.string_type;
2722 // FIXME: is Delegate operator + (D x, D y) handled?
2726 if (oper == Operator.LeftShift || oper == Operator.RightShift)
2727 return CheckShiftArguments (ec);
2729 if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
2730 if (l != TypeManager.bool_type || r != TypeManager.bool_type)
2733 type = TypeManager.bool_type;
2738 // We are dealing with numbers
2741 DoNumericPromotions (ec, l, r);
2743 if (left == null || right == null)
2747 if (oper == Operator.BitwiseAnd ||
2748 oper == Operator.BitwiseOr ||
2749 oper == Operator.ExclusiveOr){
2750 if (!((l == TypeManager.int32_type) ||
2751 (l == TypeManager.uint32_type) ||
2752 (l == TypeManager.int64_type) ||
2753 (l == TypeManager.uint64_type))){
2760 if (oper == Operator.Equality ||
2761 oper == Operator.Inequality ||
2762 oper == Operator.LessThanOrEqual ||
2763 oper == Operator.LessThan ||
2764 oper == Operator.GreaterThanOrEqual ||
2765 oper == Operator.GreaterThan){
2766 type = TypeManager.bool_type;
2772 public override Expression DoResolve (EmitContext ec)
2774 left = left.Resolve (ec);
2775 right = right.Resolve (ec);
2777 if (left == null || right == null)
2780 if (left.Type == null)
2781 throw new Exception (
2782 "Resolve returned non null, but did not set the type! (" +
2784 if (right.Type == null)
2785 throw new Exception (
2786 "Resolve returned non null, but did not set the type! (" +
2789 eclass = ExprClass.Value;
2791 return ResolveOperator (ec);
2794 public bool IsBranchable ()
2796 if (oper == Operator.Equality ||
2797 oper == Operator.Inequality ||
2798 oper == Operator.LessThan ||
2799 oper == Operator.GreaterThan ||
2800 oper == Operator.LessThanOrEqual ||
2801 oper == Operator.GreaterThanOrEqual){
2808 // This entry point is used by routines that might want
2809 // to emit a brfalse/brtrue after an expression, and instead
2810 // they could use a more compact notation.
2812 // Typically the code would generate l.emit/r.emit, followed
2813 // by the comparission and then a brtrue/brfalse. The comparissions
2814 // are sometimes inneficient (there are not as complete as the branches
2815 // look for the hacks in Emit using double ceqs).
2817 // So for those cases we provide EmitBranchable that can emit the
2818 // branch with the test
2820 public void EmitBranchable (EmitContext ec, int target)
2823 bool close_target = false;
2829 case Operator.Equality:
2831 opcode = OpCodes.Beq_S;
2833 opcode = OpCodes.Beq;
2836 case Operator.Inequality:
2838 opcode = OpCodes.Bne_Un_S;
2840 opcode = OpCodes.Bne_Un;
2843 case Operator.LessThan:
2845 opcode = OpCodes.Blt_S;
2847 opcode = OpCodes.Blt;
2850 case Operator.GreaterThan:
2852 opcode = OpCodes.Bgt_S;
2854 opcode = OpCodes.Bgt;
2857 case Operator.LessThanOrEqual:
2859 opcode = OpCodes.Ble_S;
2861 opcode = OpCodes.Ble;
2864 case Operator.GreaterThanOrEqual:
2866 opcode = OpCodes.Bge_S;
2868 opcode = OpCodes.Ble;
2872 throw new Exception ("EmitBranchable called on non-EmitBranchable operator: "
2873 + oper.ToString ());
2876 ec.ig.Emit (opcode, target);
2879 public override void Emit (EmitContext ec)
2881 ILGenerator ig = ec.ig;
2883 Type r = right.Type;
2886 if (method != null) {
2888 // Note that operators are static anyway
2890 if (Arguments != null)
2891 Invocation.EmitArguments (ec, method, Arguments);
2893 if (method is MethodInfo)
2894 ig.Emit (OpCodes.Call, (MethodInfo) method);
2896 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
2905 case Operator.Multiply:
2907 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2908 opcode = OpCodes.Mul_Ovf;
2909 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2910 opcode = OpCodes.Mul_Ovf_Un;
2912 opcode = OpCodes.Mul;
2914 opcode = OpCodes.Mul;
2918 case Operator.Division:
2919 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2920 opcode = OpCodes.Div_Un;
2922 opcode = OpCodes.Div;
2925 case Operator.Modulus:
2926 if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
2927 opcode = OpCodes.Rem_Un;
2929 opcode = OpCodes.Rem;
2932 case Operator.Addition:
2934 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2935 opcode = OpCodes.Add_Ovf;
2936 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2937 opcode = OpCodes.Add_Ovf_Un;
2939 opcode = OpCodes.Mul;
2941 opcode = OpCodes.Add;
2944 case Operator.Subtraction:
2946 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2947 opcode = OpCodes.Sub_Ovf;
2948 else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
2949 opcode = OpCodes.Sub_Ovf_Un;
2951 opcode = OpCodes.Sub;
2953 opcode = OpCodes.Sub;
2956 case Operator.RightShift:
2957 opcode = OpCodes.Shr;
2960 case Operator.LeftShift:
2961 opcode = OpCodes.Shl;
2964 case Operator.Equality:
2965 opcode = OpCodes.Ceq;
2968 case Operator.Inequality:
2969 ec.ig.Emit (OpCodes.Ceq);
2970 ec.ig.Emit (OpCodes.Ldc_I4_0);
2972 opcode = OpCodes.Ceq;
2975 case Operator.LessThan:
2976 opcode = OpCodes.Clt;
2979 case Operator.GreaterThan:
2980 opcode = OpCodes.Cgt;
2983 case Operator.LessThanOrEqual:
2984 ec.ig.Emit (OpCodes.Cgt);
2985 ec.ig.Emit (OpCodes.Ldc_I4_0);
2987 opcode = OpCodes.Ceq;
2990 case Operator.GreaterThanOrEqual:
2991 ec.ig.Emit (OpCodes.Clt);
2992 ec.ig.Emit (OpCodes.Ldc_I4_1);
2994 opcode = OpCodes.Sub;
2997 case Operator.LogicalOr:
2998 case Operator.BitwiseOr:
2999 opcode = OpCodes.Or;
3002 case Operator.LogicalAnd:
3003 case Operator.BitwiseAnd:
3004 opcode = OpCodes.And;
3007 case Operator.ExclusiveOr:
3008 opcode = OpCodes.Xor;
3012 throw new Exception ("This should not happen: Operator = "
3013 + oper.ToString ());
3020 public class Conditional : Expression {
3021 Expression expr, trueExpr, falseExpr;
3024 public Conditional (Expression expr, Expression trueExpr, Expression falseExpr, Location l)
3027 this.trueExpr = trueExpr;
3028 this.falseExpr = falseExpr;
3032 public Expression Expr {
3038 public Expression TrueExpr {
3044 public Expression FalseExpr {
3050 public override Expression DoResolve (EmitContext ec)
3052 expr = expr.Resolve (ec);
3054 if (expr.Type != TypeManager.bool_type)
3055 expr = Expression.ConvertImplicitRequired (
3056 ec, expr, TypeManager.bool_type, loc);
3058 trueExpr = trueExpr.Resolve (ec);
3059 falseExpr = falseExpr.Resolve (ec);
3061 if (expr == null || trueExpr == null || falseExpr == null)
3064 if (trueExpr.Type == falseExpr.Type)
3065 type = trueExpr.Type;
3070 // First, if an implicit conversion exists from trueExpr
3071 // to falseExpr, then the result type is of type falseExpr.Type
3073 conv = ConvertImplicit (ec, trueExpr, falseExpr.Type, loc);
3075 type = falseExpr.Type;
3077 } else if ((conv = ConvertImplicit(ec, falseExpr,trueExpr.Type,loc))!= null){
3078 type = trueExpr.Type;
3081 Error (173, loc, "The type of the conditional expression can " +
3082 "not be computed because there is no implicit conversion" +
3083 " from `" + TypeManager.CSharpName (trueExpr.Type) + "'" +
3084 " and `" + TypeManager.CSharpName (falseExpr.Type) + "'");
3089 eclass = ExprClass.Value;
3093 public override void Emit (EmitContext ec)
3095 ILGenerator ig = ec.ig;
3096 Label false_target = ig.DefineLabel ();
3097 Label end_target = ig.DefineLabel ();
3100 ig.Emit (OpCodes.Brfalse, false_target);
3102 ig.Emit (OpCodes.Br, end_target);
3103 ig.MarkLabel (false_target);
3104 falseExpr.Emit (ec);
3105 ig.MarkLabel (end_target);
3110 // SimpleName expressions are initially formed of a single
3111 // word and it only happens at the beginning of the expression.
3113 // The expression will try to be bound to a Field, a Method
3114 // group or a Property. If those fail we pass the name to our
3115 // caller and the SimpleName is compounded to perform a type
3116 // lookup. The idea behind this process is that we want to avoid
3117 // creating a namespace map from the assemblies, as that requires
3118 // the GetExportedTypes function to be called and a hashtable to
3119 // be constructed which reduces startup time. If later we find
3120 // that this is slower, we should create a `NamespaceExpr' expression
3121 // that fully participates in the resolution process.
3123 // For example `System.Console.WriteLine' is decomposed into
3124 // MemberAccess (MemberAccess (SimpleName ("System"), "Console"), "WriteLine")
3126 // The first SimpleName wont produce a match on its own, so it will
3128 // MemberAccess (SimpleName ("System.Console"), "WriteLine").
3130 // System.Console will produce a TypeExpr match.
3132 // The downside of this is that we might be hitting `LookupType' too many
3133 // times with this scheme.
3135 public class SimpleName : Expression {
3136 public readonly string Name;
3137 public readonly Location Location;
3139 public SimpleName (string name, Location l)
3145 public static void Error120 (Location l, string name)
3149 "An object reference is required " +
3150 "for the non-static field `"+name+"'");
3154 // Checks whether we are trying to access an instance
3155 // property, method or field from a static body.
3157 Expression MemberStaticCheck (Expression e)
3159 if (e is FieldExpr){
3160 FieldInfo fi = ((FieldExpr) e).FieldInfo;
3163 Error120 (Location, Name);
3166 } else if (e is MethodGroupExpr){
3167 MethodGroupExpr mg = (MethodGroupExpr) e;
3169 if (!mg.RemoveInstanceMethods ()){
3170 Error120 (Location, mg.Methods [0].Name);
3174 } else if (e is PropertyExpr){
3175 if (!((PropertyExpr) e).IsStatic){
3176 Error120 (Location, Name);
3185 // 7.5.2: Simple Names.
3187 // Local Variables and Parameters are handled at
3188 // parse time, so they never occur as SimpleNames.
3190 public override Expression DoResolve (EmitContext ec)
3195 // Stage 1: Performed by the parser (binding to local or parameters).
3199 // Stage 2: Lookup members
3201 e = MemberLookup (ec, ec.TypeContainer.TypeBuilder, Name, true, Location);
3204 // Stage 3: Lookup symbol in the various namespaces.
3208 if ((t = ec.TypeContainer.LookupType (Name, true)) != null)
3209 return new TypeExpr (t);
3212 // Stage 3 part b: Lookup up if we are an alias to a type
3215 // Since we are cheating: we only do the Alias lookup for
3216 // namespaces if the name does not include any dots in it
3219 // IMPLEMENT ME. Read mcs/mcs/TODO for ideas, or rewrite
3220 // using NamespaceExprs (dunno how that fixes the alias
3221 // per-file though).
3223 // No match, maybe our parent can compose us
3224 // into something meaningful.
3229 // Step 2, continues here.
3233 if (e is FieldExpr){
3234 FieldExpr fe = (FieldExpr) e;
3236 if (!fe.FieldInfo.IsStatic)
3237 fe.InstanceExpression = new This (Location.Null);
3241 return MemberStaticCheck (e);
3246 public override void Emit (EmitContext ec)
3249 // If this is ever reached, then we failed to
3250 // find the name as a namespace
3253 Error (103, Location, "The name `" + Name +
3254 "' does not exist in the class `" +
3255 ec.TypeContainer.Name + "'");
3259 public class LocalTemporary : Expression, IStackStore, IMemoryLocation {
3260 LocalBuilder builder;
3262 public LocalTemporary (EmitContext ec, Type t)
3265 eclass = ExprClass.Value;
3266 builder = ec.GetTemporaryStorage (t);
3269 public override Expression DoResolve (EmitContext ec)
3274 public override void Emit (EmitContext ec)
3276 ec.ig.Emit (OpCodes.Ldloc, builder);
3279 public void Store (EmitContext ec)
3281 ec.ig.Emit (OpCodes.Stloc, builder);
3284 public void AddressOf (EmitContext ec)
3286 ec.ig.Emit (OpCodes.Ldloca, builder);
3290 public class LocalVariableReference : Expression, IStackStore, IMemoryLocation {
3291 public readonly string Name;
3292 public readonly Block Block;
3294 VariableInfo variable_info;
3296 public LocalVariableReference (Block block, string name)
3300 eclass = ExprClass.Variable;
3303 public VariableInfo VariableInfo {
3305 if (variable_info == null)
3306 variable_info = Block.GetVariableInfo (Name);
3307 return variable_info;
3311 public override Expression DoResolve (EmitContext ec)
3313 VariableInfo vi = VariableInfo;
3315 type = vi.VariableType;
3319 public override void Emit (EmitContext ec)
3321 VariableInfo vi = VariableInfo;
3322 ILGenerator ig = ec.ig;
3329 ig.Emit (OpCodes.Ldloc_0);
3333 ig.Emit (OpCodes.Ldloc_1);
3337 ig.Emit (OpCodes.Ldloc_2);
3341 ig.Emit (OpCodes.Ldloc_3);
3346 ig.Emit (OpCodes.Ldloc_S, (byte) idx);
3348 ig.Emit (OpCodes.Ldloc, idx);
3353 public static void Store (ILGenerator ig, int idx)
3357 ig.Emit (OpCodes.Stloc_0);
3361 ig.Emit (OpCodes.Stloc_1);
3365 ig.Emit (OpCodes.Stloc_2);
3369 ig.Emit (OpCodes.Stloc_3);
3374 ig.Emit (OpCodes.Stloc_S, (byte) idx);
3376 ig.Emit (OpCodes.Stloc, idx);
3381 public void Store (EmitContext ec)
3383 ILGenerator ig = ec.ig;
3384 VariableInfo vi = VariableInfo;
3388 // Funny seems the above generates optimal code for us, but
3389 // seems to take too long to generate what we need.
3390 // ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
3395 public void AddressOf (EmitContext ec)
3397 VariableInfo vi = VariableInfo;
3404 ec.ig.Emit (OpCodes.Ldloca_S, (byte) idx);
3406 ec.ig.Emit (OpCodes.Ldloca, idx);
3410 public class ParameterReference : Expression, IStackStore, IMemoryLocation {
3411 public readonly Parameters Pars;
3412 public readonly String Name;
3413 public readonly int Idx;
3416 public ParameterReference (Parameters pars, int idx, string name)
3421 eclass = ExprClass.Variable;
3424 public override Expression DoResolve (EmitContext ec)
3426 Type [] types = Pars.GetParameterInfo (ec.TypeContainer);
3437 public override void Emit (EmitContext ec)
3440 ec.ig.Emit (OpCodes.Ldarg_S, (byte) arg_idx);
3442 ec.ig.Emit (OpCodes.Ldarg, arg_idx);
3445 public void Store (EmitContext ec)
3448 ec.ig.Emit (OpCodes.Starg_S, (byte) arg_idx);
3450 ec.ig.Emit (OpCodes.Starg, arg_idx);
3454 public void AddressOf (EmitContext ec)
3457 ec.ig.Emit (OpCodes.Ldarga_S, (byte) arg_idx);
3459 ec.ig.Emit (OpCodes.Ldarga, arg_idx);
3464 // Used for arguments to New(), Invocation()
3466 public class Argument {
3473 public readonly AType Type;
3474 public Expression expr;
3476 public Argument (Expression expr, AType type)
3482 public Expression Expr {
3492 public bool Resolve (EmitContext ec)
3494 expr = expr.Resolve (ec);
3496 return expr != null;
3499 public void Emit (EmitContext ec)
3506 // Invocation of methods or delegates.
3508 public class Invocation : ExpressionStatement {
3509 public readonly ArrayList Arguments;
3510 public readonly Location Location;
3513 MethodBase method = null;
3515 static Hashtable method_parameter_cache;
3517 static Invocation ()
3519 method_parameter_cache = new Hashtable ();
3523 // arguments is an ArrayList, but we do not want to typecast,
3524 // as it might be null.
3526 // FIXME: only allow expr to be a method invocation or a
3527 // delegate invocation (7.5.5)
3529 public Invocation (Expression expr, ArrayList arguments, Location l)
3532 Arguments = arguments;
3536 public Expression Expr {
3543 // Returns the Parameters (a ParameterData interface) for the
3546 public static ParameterData GetParameterData (MethodBase mb)
3548 object pd = method_parameter_cache [mb];
3551 return (ParameterData) pd;
3553 if (mb is MethodBuilder || mb is ConstructorBuilder){
3554 MethodCore mc = TypeContainer.LookupMethodByBuilder (mb);
3556 InternalParameters ip = mc.ParameterInfo;
3557 method_parameter_cache [mb] = ip;
3559 return (ParameterData) ip;
3561 ParameterInfo [] pi = mb.GetParameters ();
3562 ReflectionParameters rp = new ReflectionParameters (pi);
3563 method_parameter_cache [mb] = rp;
3565 return (ParameterData) rp;
3570 // Tells whether a user defined conversion from Type `from' to
3571 // Type `to' exists.
3573 // FIXME: we could implement a cache here.
3575 static bool ConversionExists (EmitContext ec, Type from, Type to, Location loc)
3577 // Locate user-defined implicit operators
3581 mg = MemberLookup (ec, to, "op_Implicit", false, loc);
3584 MethodGroupExpr me = (MethodGroupExpr) mg;
3586 for (int i = me.Methods.Length; i > 0;) {
3588 MethodBase mb = me.Methods [i];
3589 ParameterData pd = GetParameterData (mb);
3591 if (from == pd.ParameterType (0))
3596 mg = MemberLookup (ec, from, "op_Implicit", false, loc);
3599 MethodGroupExpr me = (MethodGroupExpr) mg;
3601 for (int i = me.Methods.Length; i > 0;) {
3603 MethodBase mb = me.Methods [i];
3604 MethodInfo mi = (MethodInfo) mb;
3606 if (mi.ReturnType == to)
3615 // Determines "better conversion" as specified in 7.4.2.3
3616 // Returns : 1 if a->p is better
3617 // 0 if a->q or neither is better
3619 static int BetterConversion (EmitContext ec, Argument a, Type p, Type q, bool use_standard,
3622 Type argument_type = a.Expr.Type;
3623 Expression argument_expr = a.Expr;
3625 if (argument_type == null)
3626 throw new Exception ("Expression of type " + a.Expr + " does not resolve its type");
3631 if (argument_type == p)
3634 if (argument_type == q)
3638 // Now probe whether an implicit constant expression conversion
3641 // An implicit constant expression conversion permits the following
3644 // * A constant-expression of type `int' can be converted to type
3645 // sbyte, byute, short, ushort, uint, ulong provided the value of
3646 // of the expression is withing the range of the destination type.
3648 // * A constant-expression of type long can be converted to type
3649 // ulong, provided the value of the constant expression is not negative
3651 // FIXME: Note that this assumes that constant folding has
3652 // taken place. We dont do constant folding yet.
3655 if (argument_expr is IntLiteral){
3656 IntLiteral ei = (IntLiteral) argument_expr;
3657 int value = ei.Value;
3659 if (p == TypeManager.sbyte_type){
3660 if (value >= SByte.MinValue && value <= SByte.MaxValue)
3662 } else if (p == TypeManager.byte_type){
3663 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
3665 } else if (p == TypeManager.short_type){
3666 if (value >= Int16.MinValue && value <= Int16.MaxValue)
3668 } else if (p == TypeManager.ushort_type){
3669 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
3671 } else if (p == TypeManager.uint32_type){
3673 // we can optimize this case: a positive int32
3674 // always fits on a uint32
3678 } else if (p == TypeManager.uint64_type){
3680 // we can optimize this case: a positive int32
3681 // always fits on a uint64
3686 } else if (argument_type == TypeManager.int64_type && argument_expr is LongLiteral){
3687 LongLiteral ll = (LongLiteral) argument_expr;
3689 if (p == TypeManager.uint64_type){
3700 tmp = ConvertImplicitStandard (ec, argument_expr, p, loc);
3702 tmp = ConvertImplicit (ec, argument_expr, p, loc);
3711 if (ConversionExists (ec, p, q, loc) == true &&
3712 ConversionExists (ec, q, p, loc) == false)
3715 if (p == TypeManager.sbyte_type)
3716 if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
3717 q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3720 if (p == TypeManager.short_type)
3721 if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
3722 q == TypeManager.uint64_type)
3725 if (p == TypeManager.int32_type)
3726 if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
3729 if (p == TypeManager.int64_type)
3730 if (q == TypeManager.uint64_type)
3737 // Determines "Better function" and returns an integer indicating :
3738 // 0 if candidate ain't better
3739 // 1 if candidate is better than the current best match
3741 static int BetterFunction (EmitContext ec, ArrayList args,
3742 MethodBase candidate, MethodBase best,
3743 bool use_standard, Location loc)
3745 ParameterData candidate_pd = GetParameterData (candidate);
3746 ParameterData best_pd;
3752 argument_count = args.Count;
3754 if (candidate_pd.Count == 0 && argument_count == 0)
3758 if (candidate_pd.Count == argument_count) {
3760 for (int j = argument_count; j > 0;) {
3763 Argument a = (Argument) args [j];
3765 x = BetterConversion (
3766 ec, a, candidate_pd.ParameterType (j), null,
3782 best_pd = GetParameterData (best);
3784 if (candidate_pd.Count == argument_count && best_pd.Count == argument_count) {
3785 int rating1 = 0, rating2 = 0;
3787 for (int j = argument_count; j > 0;) {
3791 Argument a = (Argument) args [j];
3793 x = BetterConversion (ec, a, candidate_pd.ParameterType (j),
3794 best_pd.ParameterType (j), use_standard, loc);
3795 y = BetterConversion (ec, a, best_pd.ParameterType (j),
3796 candidate_pd.ParameterType (j), use_standard,
3803 if (rating1 > rating2)
3812 public static string FullMethodDesc (MethodBase mb)
3814 StringBuilder sb = new StringBuilder (mb.Name);
3815 ParameterData pd = GetParameterData (mb);
3817 int count = pd.Count;
3820 for (int i = count; i > 0; ) {
3823 sb.Append (TypeManager.CSharpName (pd.ParameterType (count - i - 1)));
3829 return sb.ToString ();
3832 public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2)
3834 MemberInfo [] miset;
3835 MethodGroupExpr union;
3837 if (mg1 != null && mg2 != null) {
3839 MethodGroupExpr left_set = null, right_set = null;
3840 int length1 = 0, length2 = 0;
3842 left_set = (MethodGroupExpr) mg1;
3843 length1 = left_set.Methods.Length;
3845 right_set = (MethodGroupExpr) mg2;
3846 length2 = right_set.Methods.Length;
3848 ArrayList common = new ArrayList ();
3850 for (int i = 0; i < left_set.Methods.Length; i++) {
3851 for (int j = 0; j < right_set.Methods.Length; j++) {
3852 if (left_set.Methods [i] == right_set.Methods [j])
3853 common.Add (left_set.Methods [i]);
3857 miset = new MemberInfo [length1 + length2 - common.Count];
3859 left_set.Methods.CopyTo (miset, 0);
3863 for (int j = 0; j < right_set.Methods.Length; j++)
3864 if (!common.Contains (right_set.Methods [j]))
3865 miset [length1 + k++] = right_set.Methods [j];
3867 union = new MethodGroupExpr (miset);
3871 } else if (mg1 == null && mg2 != null) {
3873 MethodGroupExpr me = (MethodGroupExpr) mg2;
3875 miset = new MemberInfo [me.Methods.Length];
3876 me.Methods.CopyTo (miset, 0);
3878 union = new MethodGroupExpr (miset);
3882 } else if (mg2 == null && mg1 != null) {
3884 MethodGroupExpr me = (MethodGroupExpr) mg1;
3886 miset = new MemberInfo [me.Methods.Length];
3887 me.Methods.CopyTo (miset, 0);
3889 union = new MethodGroupExpr (miset);
3898 // Find the Applicable Function Members (7.4.2.1)
3900 // me: Method Group expression with the members to select.
3901 // it might contain constructors or methods (or anything
3902 // that maps to a method).
3904 // Arguments: ArrayList containing resolved Argument objects.
3906 // loc: The location if we want an error to be reported, or a Null
3907 // location for "probing" purposes.
3909 // inside_user_defined: controls whether OverloadResolve should use the
3910 // ConvertImplicit or ConvertImplicitStandard during overload resolution.
3912 // Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
3913 // that is the best match of me on Arguments.
3916 public static MethodBase OverloadResolve (EmitContext ec, MethodGroupExpr me,
3917 ArrayList Arguments, Location loc,
3920 ArrayList afm = new ArrayList ();
3921 int best_match_idx = -1;
3922 MethodBase method = null;
3925 for (int i = me.Methods.Length; i > 0; ){
3927 MethodBase candidate = me.Methods [i];
3930 x = BetterFunction (ec, Arguments, candidate, method, use_standard, loc);
3936 method = me.Methods [best_match_idx];
3940 if (Arguments == null)
3943 argument_count = Arguments.Count;
3947 // Now we see if we can at least find a method with the same number of arguments
3948 // and then try doing implicit conversion on the arguments
3949 if (best_match_idx == -1) {
3951 for (int i = me.Methods.Length; i > 0;) {
3953 MethodBase mb = me.Methods [i];
3954 pd = GetParameterData (mb);
3956 if (pd.Count == argument_count) {
3958 method = me.Methods [best_match_idx];
3969 // And now convert implicitly, each argument to the required type
3971 pd = GetParameterData (method);
3973 for (int j = argument_count; j > 0;) {
3975 Argument a = (Argument) Arguments [j];
3976 Expression a_expr = a.Expr;
3977 Type parameter_type = pd.ParameterType (j);
3979 if (a_expr.Type != parameter_type){
3983 conv = ConvertImplicitStandard (ec, a_expr, parameter_type,
3986 conv = ConvertImplicit (ec, a_expr, parameter_type,
3990 if (!Location.IsNull (loc)) {
3992 "The best overloaded match for method '" + FullMethodDesc (method) +
3993 "' has some invalid arguments");
3995 "Argument " + (j+1) +
3996 ": Cannot convert from '" + TypeManager.CSharpName (a_expr.Type)
3997 + "' to '" + TypeManager.CSharpName (pd.ParameterType (j)) + "'");
4002 // Update the argument with the implicit conversion
4012 public static MethodBase OverloadResolve (EmitContext ec, MethodGroupExpr me,
4013 ArrayList Arguments, Location loc)
4015 return OverloadResolve (ec, me, Arguments, loc, false);
4018 public override Expression DoResolve (EmitContext ec)
4020 bool IsDelegate = false;
4022 // First, resolve the expression that is used to
4023 // trigger the invocation
4025 this.expr = expr.Resolve (ec);
4026 if (this.expr == null)
4029 Type expr_type = null;
4030 if (!(this.expr is MethodGroupExpr)) {
4031 expr_type = this.expr.Type;
4032 IsDelegate = TypeManager.IsDelegateType (expr_type);
4036 return (new DelegateInvocation (this.expr, Arguments, Location)).Resolve (ec);
4039 if (!(this.expr is MethodGroupExpr)){
4040 report118 (Location, this.expr, "method group");
4045 // Next, evaluate all the expressions in the argument list
4047 if (Arguments != null){
4048 for (int i = Arguments.Count; i > 0;){
4050 Argument a = (Argument) Arguments [i];
4052 if (!a.Resolve (ec))
4057 method = OverloadResolve (ec, (MethodGroupExpr) this.expr, Arguments,
4060 if (method == null){
4061 Error (-6, Location,
4062 "Could not find any applicable function for this argument list");
4066 if (method is MethodInfo)
4067 type = ((MethodInfo)method).ReturnType;
4069 eclass = ExprClass.Value;
4073 public static void EmitArguments (EmitContext ec, MethodBase method, ArrayList Arguments)
4077 if (Arguments != null)
4078 top = Arguments.Count;
4082 for (int i = 0; i < top; i++){
4083 Argument a = (Argument) Arguments [i];
4089 public static void EmitCall (EmitContext ec,
4090 bool is_static, Expression instance_expr,
4091 MethodBase method, ArrayList Arguments)
4093 ILGenerator ig = ec.ig;
4094 bool struct_call = false;
4098 // If this is ourselves, push "this"
4100 if (instance_expr == null){
4101 ig.Emit (OpCodes.Ldarg_0);
4104 // Push the instance expression
4106 if (instance_expr.Type.IsSubclassOf (TypeManager.value_type)){
4111 // If the expression implements IMemoryLocation, then
4112 // we can optimize and use AddressOf on the
4115 // If not we have to use some temporary storage for
4117 if (instance_expr is IMemoryLocation)
4118 ((IMemoryLocation) instance_expr).AddressOf (ec);
4120 Type t = instance_expr.Type;
4122 instance_expr.Emit (ec);
4123 LocalBuilder temp = ec.GetTemporaryStorage (t);
4124 ig.Emit (OpCodes.Stloc, temp);
4125 ig.Emit (OpCodes.Ldloca, temp);
4128 instance_expr.Emit (ec);
4132 if (Arguments != null)
4133 EmitArguments (ec, method, Arguments);
4135 if (is_static || struct_call){
4136 if (method is MethodInfo)
4137 ig.Emit (OpCodes.Call, (MethodInfo) method);
4139 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
4141 if (method is MethodInfo)
4142 ig.Emit (OpCodes.Callvirt, (MethodInfo) method);
4144 ig.Emit (OpCodes.Callvirt, (ConstructorInfo) method);
4148 public override void Emit (EmitContext ec)
4150 MethodGroupExpr mg = (MethodGroupExpr) this.expr;
4151 EmitCall (ec, method.IsStatic, mg.InstanceExpression, method, Arguments);
4154 public override void EmitStatement (EmitContext ec)
4159 // Pop the return value if there is one
4161 if (method is MethodInfo){
4162 if (((MethodInfo)method).ReturnType != TypeManager.void_type)
4163 ec.ig.Emit (OpCodes.Pop);
4168 public class New : ExpressionStatement {
4175 public readonly NType NewType;
4176 public readonly ArrayList Arguments;
4177 public readonly string RequestedType;
4179 // These are for the case when we have an array
4180 public readonly string Rank;
4181 public readonly ArrayList Initializers;
4184 MethodBase method = null;
4187 // If set, the new expression is for a value_target, and
4188 // we will not leave anything on the stack.
4190 Expression value_target;
4192 public New (string requested_type, ArrayList arguments, Location loc)
4194 RequestedType = requested_type;
4195 Arguments = arguments;
4196 NewType = NType.Object;
4200 public New (string requested_type, ArrayList exprs, string rank, ArrayList initializers, Location loc)
4202 RequestedType = requested_type;
4204 Initializers = initializers;
4205 NewType = NType.Array;
4208 Arguments = new ArrayList ();
4210 foreach (Expression e in exprs)
4211 Arguments.Add (new Argument (e, Argument.AType.Expression));
4215 public static string FormLookupType (string base_type, int idx_count, string rank)
4217 StringBuilder sb = new StringBuilder (base_type);
4222 for (int i = 1; i < idx_count; i++)
4226 return sb.ToString ();
4229 public Expression ValueTypeVariable {
4231 return value_target;
4235 value_target = value;
4239 public override Expression DoResolve (EmitContext ec)
4241 if (NewType == NType.Object) {
4243 type = ec.TypeContainer.LookupType (RequestedType, false);
4248 bool IsDelegate = TypeManager.IsDelegateType (type);
4251 return (new NewDelegate (type, Arguments, Location)).Resolve (ec);
4255 ml = MemberLookup (ec, type, ".ctor", false,
4256 MemberTypes.Constructor, AllBindingsFlags, Location);
4258 bool is_struct = false;
4259 is_struct = type.IsSubclassOf (TypeManager.value_type);
4261 if (! (ml is MethodGroupExpr)){
4263 report118 (Location, ml, "method group");
4269 if (Arguments != null){
4270 for (int i = Arguments.Count; i > 0;){
4272 Argument a = (Argument) Arguments [i];
4274 if (!a.Resolve (ec))
4279 method = Invocation.OverloadResolve (ec, (MethodGroupExpr) ml,
4280 Arguments, Location);
4284 if (method == null && !is_struct) {
4285 Error (-6, Location,
4286 "New invocation: Can not find a constructor for " +
4287 "this argument list");
4291 eclass = ExprClass.Value;
4296 if (NewType == NType.Array) {
4297 throw new Exception ("Finish array creation");
4304 // This DoEmit can be invoked in two contexts:
4305 // * As a mechanism that will leave a value on the stack (new object)
4306 // * As one that wont (init struct)
4308 // You can control whether a value is required on the stack by passing
4309 // need_value_on_stack. The code *might* leave a value on the stack
4310 // so it must be popped manually
4312 // Returns whether a value is left on the stack
4314 bool DoEmit (EmitContext ec, bool need_value_on_stack)
4316 if (method == null){
4317 IMemoryLocation ml = (IMemoryLocation) value_target;
4321 Invocation.EmitArguments (ec, method, Arguments);
4322 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
4327 // It must be a value type, sanity check
4329 if (value_target != null){
4330 ec.ig.Emit (OpCodes.Initobj, type);
4332 if (need_value_on_stack){
4333 value_target.Emit (ec);
4339 throw new Exception ("No method and no value type");
4342 public override void Emit (EmitContext ec)
4347 public override void EmitStatement (EmitContext ec)
4349 if (DoEmit (ec, false))
4350 ec.ig.Emit (OpCodes.Pop);
4355 // Represents the `this' construct
4357 public class This : Expression, IStackStore, IMemoryLocation {
4360 public This (Location loc)
4365 public override Expression DoResolve (EmitContext ec)
4367 eclass = ExprClass.Variable;
4368 type = ec.TypeContainer.TypeBuilder;
4371 Report.Error (26, loc,
4372 "Keyword this not valid in static code");
4379 public Expression DoResolveLValue (EmitContext ec)
4383 if (ec.TypeContainer is Class){
4384 Report.Error (1604, loc, "Cannot assign to `this'");
4391 public override void Emit (EmitContext ec)
4393 ec.ig.Emit (OpCodes.Ldarg_0);
4396 public void Store (EmitContext ec)
4398 ec.ig.Emit (OpCodes.Starg, 0);
4401 public void AddressOf (EmitContext ec)
4403 ec.ig.Emit (OpCodes.Ldarga_S, (byte) 0);
4408 // Implements the typeof operator
4410 public class TypeOf : Expression {
4411 public readonly string QueriedType;
4414 public TypeOf (string queried_type)
4416 QueriedType = queried_type;
4419 public override Expression DoResolve (EmitContext ec)
4421 typearg = ec.TypeContainer.LookupType (QueriedType, false);
4423 if (typearg == null)
4426 type = TypeManager.type_type;
4427 eclass = ExprClass.Type;
4431 public override void Emit (EmitContext ec)
4433 ec.ig.Emit (OpCodes.Ldtoken, typearg);
4434 ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
4438 public class SizeOf : Expression {
4439 public readonly string QueriedType;
4441 public SizeOf (string queried_type)
4443 this.QueriedType = queried_type;
4446 public override Expression DoResolve (EmitContext ec)
4448 // FIXME: Implement;
4449 throw new Exception ("Unimplemented");
4453 public override void Emit (EmitContext ec)
4455 throw new Exception ("Implement me");
4459 public class MemberAccess : Expression {
4460 public readonly string Identifier;
4462 Expression member_lookup;
4465 public MemberAccess (Expression expr, string id, Location l)
4472 public Expression Expr {
4478 void error176 (Location loc, string name)
4480 Report.Error (176, loc, "Static member `" +
4481 name + "' cannot be accessed " +
4482 "with an instance reference, qualify with a " +
4483 "type name instead");
4486 public override Expression DoResolve (EmitContext ec)
4488 expr = expr.Resolve (ec);
4493 if (expr is SimpleName){
4494 SimpleName child_expr = (SimpleName) expr;
4496 expr = new SimpleName (child_expr.Name + "." + Identifier, loc);
4498 return expr.Resolve (ec);
4501 member_lookup = MemberLookup (ec, expr.Type, Identifier, false, loc);
4506 if (member_lookup is MethodGroupExpr){
4507 MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
4512 if (expr is TypeExpr){
4513 if (!mg.RemoveInstanceMethods ()){
4514 SimpleName.Error120 (loc, mg.Methods [0].Name);
4518 return member_lookup;
4522 // Instance.MethodGroup
4524 if (!mg.RemoveStaticMethods ()){
4525 error176 (loc, mg.Methods [0].Name);
4529 mg.InstanceExpression = expr;
4531 return member_lookup;
4534 if (member_lookup is FieldExpr){
4535 FieldExpr fe = (FieldExpr) member_lookup;
4537 if (expr is TypeExpr){
4538 if (!fe.FieldInfo.IsStatic){
4539 error176 (loc, fe.FieldInfo.Name);
4542 return member_lookup;
4544 if (fe.FieldInfo.IsStatic){
4545 error176 (loc, fe.FieldInfo.Name);
4548 fe.InstanceExpression = expr;
4554 if (member_lookup is PropertyExpr){
4555 PropertyExpr pe = (PropertyExpr) member_lookup;
4557 if (expr is TypeExpr){
4559 SimpleName.Error120 (loc, pe.PropertyInfo.Name);
4565 error176 (loc, pe.PropertyInfo.Name);
4568 pe.InstanceExpression = expr;
4574 Console.WriteLine ("Support for " + member_lookup + " is not present yet");
4575 Environment.Exit (0);
4579 public override void Emit (EmitContext ec)
4581 throw new Exception ("Should not happen I think");
4587 // Fully resolved expression that evaluates to a type
4589 public class TypeExpr : Expression {
4590 public TypeExpr (Type t)
4593 eclass = ExprClass.Type;
4596 override public Expression DoResolve (EmitContext ec)
4601 override public void Emit (EmitContext ec)
4603 throw new Exception ("Implement me");
4608 // MethodGroup Expression.
4610 // This is a fully resolved expression that evaluates to a type
4612 public class MethodGroupExpr : Expression {
4613 public MethodBase [] Methods;
4614 Expression instance_expression = null;
4616 public MethodGroupExpr (MemberInfo [] mi)
4618 Methods = new MethodBase [mi.Length];
4619 mi.CopyTo (Methods, 0);
4620 eclass = ExprClass.MethodGroup;
4623 public MethodGroupExpr (ArrayList l)
4625 Methods = new MethodBase [l.Count];
4627 l.CopyTo (Methods, 0);
4628 eclass = ExprClass.MethodGroup;
4632 // `A method group may have associated an instance expression'
4634 public Expression InstanceExpression {
4636 return instance_expression;
4640 instance_expression = value;
4644 override public Expression DoResolve (EmitContext ec)
4649 override public void Emit (EmitContext ec)
4651 throw new Exception ("This should never be reached");
4654 bool RemoveMethods (bool keep_static)
4656 ArrayList smethods = new ArrayList ();
4657 int top = Methods.Length;
4660 for (i = 0; i < top; i++){
4661 MethodBase mb = Methods [i];
4663 if (mb.IsStatic == keep_static)
4667 if (smethods.Count == 0)
4670 Methods = new MethodBase [smethods.Count];
4671 smethods.CopyTo (Methods, 0);
4677 // Removes any instance methods from the MethodGroup, returns
4678 // false if the resulting set is empty.
4680 public bool RemoveInstanceMethods ()
4682 return RemoveMethods (true);
4686 // Removes any static methods from the MethodGroup, returns
4687 // false if the resulting set is empty.
4689 public bool RemoveStaticMethods ()
4691 return RemoveMethods (false);
4696 // Fully resolved expression that evaluates to a Field
4698 public class FieldExpr : Expression, IStackStore, IMemoryLocation {
4699 public readonly FieldInfo FieldInfo;
4700 public Expression InstanceExpression;
4703 public FieldExpr (FieldInfo fi, Location l)
4706 eclass = ExprClass.Variable;
4707 type = fi.FieldType;
4711 override public Expression DoResolve (EmitContext ec)
4713 if (!FieldInfo.IsStatic){
4714 if (InstanceExpression == null){
4715 throw new Exception ("non-static FieldExpr without instance var\n" +
4716 "You have to assign the Instance variable\n" +
4717 "Of the FieldExpr to set this\n");
4720 InstanceExpression = InstanceExpression.Resolve (ec);
4721 if (InstanceExpression == null)
4728 public Expression DoResolveLValue (EmitContext ec)
4730 if (!FieldInfo.IsInitOnly)
4734 // InitOnly fields can only be assigned in constructors
4737 if (ec.IsConstructor)
4740 Report.Error (191, loc,
4741 "Readonly field can not be assigned outside " +
4742 "of constructor or variable initializer");
4747 override public void Emit (EmitContext ec)
4749 ILGenerator ig = ec.ig;
4751 if (FieldInfo.IsStatic)
4752 ig.Emit (OpCodes.Ldsfld, FieldInfo);
4754 InstanceExpression.Emit (ec);
4756 ig.Emit (OpCodes.Ldfld, FieldInfo);
4760 public void Store (EmitContext ec)
4762 if (FieldInfo.IsStatic)
4763 ec.ig.Emit (OpCodes.Stsfld, FieldInfo);
4765 ec.ig.Emit (OpCodes.Stfld, FieldInfo);
4768 public void AddressOf (EmitContext ec)
4770 if (FieldInfo.IsStatic)
4771 ec.ig.Emit (OpCodes.Ldsflda, FieldInfo);
4773 InstanceExpression.Emit (ec);
4774 ec.ig.Emit (OpCodes.Ldflda, FieldInfo);
4780 // Expression that evaluates to a Property. The Assign class
4781 // might set the `Value' expression if we are in an assignment.
4783 // This is not an LValue because we need to re-write the expression, we
4784 // can not take data from the stack and store it.
4786 public class PropertyExpr : ExpressionStatement {
4787 public readonly PropertyInfo PropertyInfo;
4788 public readonly bool IsStatic;
4789 MethodInfo [] Accessors;
4792 Expression instance_expr;
4795 public PropertyExpr (PropertyInfo pi, Location l)
4798 eclass = ExprClass.PropertyAccess;
4801 Accessors = TypeManager.GetAccessors (pi);
4803 if (Accessors != null)
4804 for (int i = 0; i < Accessors.Length; i++){
4805 if (Accessors [i] != null)
4806 if (Accessors [i].IsStatic)
4810 Accessors = new MethodInfo [2];
4812 type = pi.PropertyType;
4816 // Controls the Value of the PropertyExpr. If the value
4817 // is null, then the property is being used in a `read' mode.
4818 // otherwise the property is used in assignment mode.
4820 // The value is set to a fully resolved type by assign.
4822 public Expression Value {
4833 // The instance expression associated with this expression
4835 public Expression InstanceExpression {
4837 instance_expr = value;
4841 return instance_expr;
4845 public bool VerifyAssignable ()
4847 if (!PropertyInfo.CanWrite){
4848 Report.Error (200, loc,
4849 "The property `" + PropertyInfo.Name +
4850 "' can not be assigned to, as it has not set accessor");
4857 override public Expression DoResolve (EmitContext ec)
4859 if (!PropertyInfo.CanRead){
4860 Report.Error (154, loc,
4861 "The property `" + PropertyInfo.Name +
4862 "' can not be used in " +
4863 "this context because it lacks a get accessor");
4870 override public void Emit (EmitContext ec)
4873 Invocation.EmitCall (ec, IsStatic, instance_expr, Accessors [0], null);
4875 Argument arg = new Argument (value, Argument.AType.Expression);
4876 ArrayList args = new ArrayList ();
4879 Invocation.EmitCall (ec, IsStatic, instance_expr, Accessors [1], args);
4883 override public void EmitStatement (EmitContext ec)
4887 ec.ig.Emit (OpCodes.Pop);
4893 // Fully resolved expression that evaluates to a Expression
4895 public class EventExpr : Expression {
4896 public readonly EventInfo EventInfo;
4899 public EventExpr (EventInfo ei, Location loc)
4903 eclass = ExprClass.EventAccess;
4906 override public Expression DoResolve (EmitContext ec)
4908 // We are born in resolved state.
4912 override public void Emit (EmitContext ec)
4914 throw new Exception ("Implement me");
4915 // FIXME: Implement.
4919 public class CheckedExpr : Expression {
4921 public Expression Expr;
4923 public CheckedExpr (Expression e)
4928 public override Expression DoResolve (EmitContext ec)
4930 Expr = Expr.Resolve (ec);
4935 eclass = Expr.ExprClass;
4940 public override void Emit (EmitContext ec)
4942 bool last_check = ec.CheckState;
4944 ec.CheckState = true;
4946 ec.CheckState = last_check;
4951 public class UnCheckedExpr : Expression {
4953 public Expression Expr;
4955 public UnCheckedExpr (Expression e)
4960 public override Expression DoResolve (EmitContext ec)
4962 Expr = Expr.Resolve (ec);
4967 eclass = Expr.ExprClass;
4972 public override void Emit (EmitContext ec)
4974 bool last_check = ec.CheckState;
4976 ec.CheckState = false;
4978 ec.CheckState = last_check;
4983 public class ElementAccess : Expression {
4985 public ArrayList Arguments;
4986 public Expression Expr;
4987 public Location loc;
4989 public ElementAccess (Expression e, ArrayList e_list, Location l)
4993 Arguments = new ArrayList ();
4994 foreach (Expression tmp in e_list)
4995 Arguments.Add (new Argument (tmp, Argument.AType.Expression));
5000 Expression CommonResolve (EmitContext ec)
5002 Expr = Expr.Resolve (ec);
5007 if (Arguments == null)
5010 for (int i = Arguments.Count; i > 0;){
5012 Argument a = (Argument) Arguments [i];
5014 if (!a.Resolve (ec))
5021 public override Expression DoResolve (EmitContext ec)
5023 Expr = CommonResolve (ec);
5029 // We perform some simple tests, and then to "split" the emit and store
5030 // code we create an instance of a different class, and return that.
5032 // I am experimenting with this pattern.
5034 if (Expr.Type == TypeManager.array_type)
5035 return (new ArrayAccess (this)).Resolve (ec);
5037 return (new IndexerAccess (this)).Resolve (ec);
5040 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
5042 Expr = CommonResolve (ec);
5047 if (Expr.Type == TypeManager.array_type)
5048 return (new ArrayAccess (this)).ResolveLValue (ec, right_side);
5050 return (new IndexerAccess (this)).ResolveLValue (ec, right_side);
5053 public override void Emit (EmitContext ec)
5055 throw new Exception ("Should never be reached");
5059 public class ArrayAccess : Expression, IStackStore {
5061 // Points to our "data" repository
5065 public ArrayAccess (ElementAccess ea_data)
5068 eclass = ExprClass.Variable;
5071 // FIXME: Figure out the type here
5075 Expression CommonResolve (EmitContext ec)
5080 public override Expression DoResolve (EmitContext ec)
5082 if (ea.Expr.ExprClass != ExprClass.Variable) {
5083 report118 (ea.loc, ea.Expr, "variable");
5087 throw new Exception ("Implement me");
5090 public void Store (EmitContext ec)
5092 throw new Exception ("Implement me !");
5095 public override void Emit (EmitContext ec)
5097 throw new Exception ("Implement me !");
5102 public ArrayList getters, setters;
5103 static Hashtable map;
5107 map = new Hashtable ();
5110 Indexers (MemberInfo [] mi)
5112 foreach (PropertyInfo property in mi){
5113 MethodInfo [] accessors;
5115 accessors = TypeManager.GetAccessors (property);
5116 if (accessors != null){
5119 if (property.CanRead){
5120 if (getters == null)
5121 getters = new ArrayList ();
5123 getters.Add (accessors [idx++]);
5125 if (property.CanWrite){
5126 if (setters == null)
5127 setters = new ArrayList ();
5129 setters.Add (accessors [idx++]);
5135 static string IndexerPropertyName (Type t)
5137 System.Attribute attr;
5139 attr = System.Attribute.GetCustomAttribute (t, TypeManager.default_member_type);
5143 DefaultMemberAttribute dma = (DefaultMemberAttribute) attr;
5145 return dma.MemberName;
5151 static public Indexers GetIndexersForType (Type t, TypeManager tm, Location loc)
5153 Indexers ix = (Indexers) map [t];
5154 string p_name = IndexerPropertyName (t);
5159 MemberInfo [] mi = tm.FindMembers (
5160 t, MemberTypes.Property,
5161 BindingFlags.Public | BindingFlags.Instance,
5162 Type.FilterName, p_name);
5164 if (mi == null || mi.Length == 0){
5165 Report.Error (21, loc,
5166 "Type `" + TypeManager.CSharpName (t) + "' does not have " +
5167 "any indexers defined");
5171 ix = new Indexers (mi);
5178 public class IndexerAccess : Expression {
5180 // Points to our "data" repository
5183 MethodInfo get, set;
5185 ArrayList set_arguments;
5187 public IndexerAccess (ElementAccess ea_data)
5190 eclass = ExprClass.Value;
5193 public bool VerifyAssignable (Expression source)
5195 throw new Exception ("Implement me!");
5198 public override Expression DoResolve (EmitContext ec)
5200 Type indexer_type = ea.Expr.Type;
5203 // Step 1: Query for all `Item' *properties*. Notice
5204 // that the actual methods are pointed from here.
5206 // This is a group of properties, piles of them.
5209 ilist = Indexers.GetIndexersForType (
5210 indexer_type, ec.TypeContainer.RootContext.TypeManager, ea.loc);
5212 if (ilist.getters != null && ilist.getters.Count > 0)
5213 get = (MethodInfo) Invocation.OverloadResolve (
5214 ec, new MethodGroupExpr (ilist.getters), ea.Arguments, ea.loc);
5217 Report.Error (154, ea.loc,
5218 "indexer can not be used in this context, because " +
5219 "it lacks a `get' accessor");
5223 type = get.ReturnType;
5224 eclass = ExprClass.Value;
5228 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
5230 Type indexer_type = ea.Expr.Type;
5231 Type right_type = right_side.Type;
5234 ilist = Indexers.GetIndexersForType (
5235 indexer_type, ec.TypeContainer.RootContext.TypeManager, ea.loc);
5237 if (ilist.setters != null && ilist.setters.Count > 0){
5238 set_arguments = (ArrayList) ea.Arguments.Clone ();
5239 set_arguments.Add (new Argument (right_side, Argument.AType.Expression));
5241 set = (MethodInfo) Invocation.OverloadResolve (
5242 ec, new MethodGroupExpr (ilist.getters), set_arguments, ea.loc);
5246 Report.Error (200, ea.loc,
5247 "indexer X.this [" + TypeManager.CSharpName (right_type) +
5248 "] lacks a `set' accessor");
5252 type = set.ReturnType;
5253 eclass = ExprClass.Value;
5257 public override void Emit (EmitContext ec)
5259 Invocation.EmitCall (ec, false, ea.Expr, get, ea.Arguments);
5263 public class BaseAccess : Expression {
5265 public enum BaseAccessType {
5270 public readonly BaseAccessType BAType;
5271 public readonly string Member;
5272 public readonly ArrayList Arguments;
5274 public BaseAccess (BaseAccessType t, string member, ArrayList args)
5282 public override Expression DoResolve (EmitContext ec)
5284 // FIXME: Implement;
5285 throw new Exception ("Unimplemented");
5289 public override void Emit (EmitContext ec)
5291 throw new Exception ("Unimplemented");
5296 // This class exists solely to pass the Type around and to be a dummy
5297 // that can be passed to the conversion functions (this is used by
5298 // foreach implementation to typecast the object return value from
5299 // get_Current into the proper type. All code has been generated and
5300 // we only care about the side effect conversions to be performed
5303 public class EmptyExpression : Expression {
5304 public EmptyExpression ()
5306 type = TypeManager.object_type;
5307 eclass = ExprClass.Value;
5310 public override Expression DoResolve (EmitContext ec)
5315 public override void Emit (EmitContext ec)
5317 // nothing, as we only exist to not do anything.
5321 public class UserCast : Expression {
5325 public UserCast (MethodInfo method, Expression source)
5327 this.method = method;
5328 this.source = source;
5329 type = method.ReturnType;
5330 eclass = ExprClass.Value;
5333 public override Expression DoResolve (EmitContext ec)
5336 // We are born fully resolved
5341 public override void Emit (EmitContext ec)
5343 ILGenerator ig = ec.ig;
5347 if (method is MethodInfo)
5348 ig.Emit (OpCodes.Call, (MethodInfo) method);
5350 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
projects / mono.git / blob