2 // ecore.cs: Core of the Expression representation for the intermediate tree.
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001 Ximian, Inc.
11 namespace Mono.CSharp {
13 using System.Collections;
14 using System.Diagnostics;
15 using System.Reflection;
16 using System.Reflection.Emit;
20 /// The ExprClass class contains the is used to pass the
21 /// classification of an expression (value, variable, namespace,
22 /// type, method group, property access, event access, indexer access,
25 public enum ExprClass : byte {
40 /// This is used to tell Resolve in which types of expressions we're
44 public enum ResolveFlags {
45 // Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
48 // Returns a type expression.
51 // Returns a method group.
54 // Allows SimpleNames to be returned.
55 // This is used by MemberAccess to construct long names that can not be
56 // partially resolved (namespace-qualified names for example).
59 // Mask of all the expression class flags.
62 // Disable control flow analysis while resolving the expression.
63 // This is used when resolving the instance expression of a field expression.
64 DisableFlowAnalysis = 16
68 // This is just as a hint to AddressOf of what will be done with the
71 public enum AddressOp {
78 /// This interface is implemented by variables
80 public interface IMemoryLocation {
82 /// The AddressOf method should generate code that loads
83 /// the address of the object and leaves it on the stack.
85 /// The `mode' argument is used to notify the expression
86 /// of whether this will be used to read from the address or
87 /// write to the address.
89 /// This is just a hint that can be used to provide good error
90 /// reporting, and should have no other side effects.
92 void AddressOf (EmitContext ec, AddressOp mode);
96 /// This interface is implemented by variables
98 public interface IVariable {
100 /// Checks whether the variable has already been assigned at
101 /// the current position of the method's control flow and
102 /// reports an appropriate error message if not.
104 /// If the variable is a struct, then this call checks whether
105 /// all of its fields (including all private ones) have been
108 bool IsAssigned (EmitContext ec, Location loc);
111 /// Checks whether field `name' in this struct has been assigned.
113 bool IsFieldAssigned (EmitContext ec, string name, Location loc);
116 /// Tells the flow analysis code that the variable has already
117 /// been assigned at the current code position.
119 /// If the variable is a struct, this call marks all its fields
120 /// (including private fields) as being assigned.
122 void SetAssigned (EmitContext ec);
125 /// Tells the flow analysis code that field `name' in this struct
126 /// has already been assigned atthe current code position.
128 void SetFieldAssigned (EmitContext ec, string name);
132 /// This interface denotes an expression which evaluates to a member
133 /// of a struct or a class.
135 public interface IMemberExpr
138 /// The name of this member.
145 /// Whether this is an instance member.
152 /// Whether this is a static member.
159 /// The type which declares this member.
166 /// The instance expression associated with this member, if it's a
167 /// non-static member.
169 Expression InstanceExpression {
175 /// Expression which resolves to a type.
177 public interface ITypeExpression
180 /// Resolve the expression, but only lookup types.
182 Expression DoResolveType (EmitContext ec);
186 /// Base class for expressions
188 public abstract class Expression {
189 public ExprClass eclass;
191 protected Location loc;
203 public Location Location {
210 /// Utility wrapper routine for Error, just to beautify the code
212 public void Error (int error, string s)
214 if (!Location.IsNull (loc))
215 Report.Error (error, loc, s);
217 Report.Error (error, s);
221 /// Utility wrapper routine for Warning, just to beautify the code
223 public void Warning (int warning, string s)
225 if (!Location.IsNull (loc))
226 Report.Warning (warning, loc, s);
228 Report.Warning (warning, s);
232 /// Utility wrapper routine for Warning, only prints the warning if
233 /// warnings of level `level' are enabled.
235 public void Warning (int warning, int level, string s)
237 if (level <= RootContext.WarningLevel)
238 Warning (warning, s);
241 static public void Error_CannotConvertType (Location loc, Type source, Type target)
243 Report.Error (30, loc, "Cannot convert type '" +
244 TypeManager.CSharpName (source) + "' to '" +
245 TypeManager.CSharpName (target) + "'");
249 /// Performs semantic analysis on the Expression
253 /// The Resolve method is invoked to perform the semantic analysis
256 /// The return value is an expression (it can be the
257 /// same expression in some cases) or a new
258 /// expression that better represents this node.
260 /// For example, optimizations of Unary (LiteralInt)
261 /// would return a new LiteralInt with a negated
264 /// If there is an error during semantic analysis,
265 /// then an error should be reported (using Report)
266 /// and a null value should be returned.
268 /// There are two side effects expected from calling
269 /// Resolve(): the the field variable "eclass" should
270 /// be set to any value of the enumeration
271 /// `ExprClass' and the type variable should be set
272 /// to a valid type (this is the type of the
275 public abstract Expression DoResolve (EmitContext ec);
277 public virtual Expression DoResolveLValue (EmitContext ec, Expression right_side)
279 return DoResolve (ec);
283 /// Resolves an expression and performs semantic analysis on it.
287 /// Currently Resolve wraps DoResolve to perform sanity
288 /// checking and assertion checking on what we expect from Resolve.
290 public Expression Resolve (EmitContext ec, ResolveFlags flags)
292 // Are we doing a types-only search ?
293 if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type) {
294 ITypeExpression type_expr = this as ITypeExpression;
296 if (type_expr == null)
299 return type_expr.DoResolveType (ec);
302 bool old_do_flow_analysis = ec.DoFlowAnalysis;
303 if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
304 ec.DoFlowAnalysis = false;
307 if (this is SimpleName)
308 e = ((SimpleName) this).DoResolveAllowStatic (ec);
312 ec.DoFlowAnalysis = old_do_flow_analysis;
317 if (e is SimpleName){
318 SimpleName s = (SimpleName) e;
320 if ((flags & ResolveFlags.SimpleName) == 0) {
322 object lookup = TypeManager.MemberLookup (
323 ec.ContainerType, ec.ContainerType, AllMemberTypes,
324 AllBindingFlags | BindingFlags.NonPublic, s.Name);
326 Error (122, "`" + s.Name + "' " +
327 "is inaccessible because of its protection level");
329 Error (103, "The name `" + s.Name + "' could not be " +
330 "found in `" + ec.DeclSpace.Name + "'");
337 if ((e is TypeExpr) || (e is ComposedCast)) {
338 if ((flags & ResolveFlags.Type) == 0) {
348 if ((flags & ResolveFlags.VariableOrValue) == 0) {
354 case ExprClass.MethodGroup:
355 if ((flags & ResolveFlags.MethodGroup) == 0) {
356 ((MethodGroupExpr) e).ReportUsageError ();
361 case ExprClass.Value:
362 case ExprClass.Variable:
363 case ExprClass.PropertyAccess:
364 case ExprClass.EventAccess:
365 case ExprClass.IndexerAccess:
366 if ((flags & ResolveFlags.VariableOrValue) == 0) {
373 throw new Exception ("Expression " + e.GetType () +
374 " ExprClass is Invalid after resolve");
378 throw new Exception (
379 "Expression " + e.GetType () +
380 " did not set its type after Resolve\n" +
381 "called from: " + this.GetType ());
387 /// Resolves an expression and performs semantic analysis on it.
389 public Expression Resolve (EmitContext ec)
391 return Resolve (ec, ResolveFlags.VariableOrValue);
395 /// Resolves an expression for LValue assignment
399 /// Currently ResolveLValue wraps DoResolveLValue to perform sanity
400 /// checking and assertion checking on what we expect from Resolve
402 public Expression ResolveLValue (EmitContext ec, Expression right_side)
404 Expression e = DoResolveLValue (ec, right_side);
407 if (e is SimpleName){
408 SimpleName s = (SimpleName) e;
412 "The name `" + s.Name + "' could not be found in `" +
413 ec.DeclSpace.Name + "'");
417 if (e.eclass == ExprClass.Invalid)
418 throw new Exception ("Expression " + e +
419 " ExprClass is Invalid after resolve");
421 if (e.eclass == ExprClass.MethodGroup) {
422 ((MethodGroupExpr) e).ReportUsageError ();
427 throw new Exception ("Expression " + e +
428 " did not set its type after Resolve");
435 /// Emits the code for the expression
439 /// The Emit method is invoked to generate the code
440 /// for the expression.
442 public abstract void Emit (EmitContext ec);
445 /// Protected constructor. Only derivate types should
446 /// be able to be created
449 protected Expression ()
451 eclass = ExprClass.Invalid;
456 /// Returns a literalized version of a literal FieldInfo
460 /// The possible return values are:
461 /// IntConstant, UIntConstant
462 /// LongLiteral, ULongConstant
463 /// FloatConstant, DoubleConstant
466 /// The value returned is already resolved.
468 public static Constant Constantify (object v, Type t)
470 if (t == TypeManager.int32_type)
471 return new IntConstant ((int) v);
472 else if (t == TypeManager.uint32_type)
473 return new UIntConstant ((uint) v);
474 else if (t == TypeManager.int64_type)
475 return new LongConstant ((long) v);
476 else if (t == TypeManager.uint64_type)
477 return new ULongConstant ((ulong) v);
478 else if (t == TypeManager.float_type)
479 return new FloatConstant ((float) v);
480 else if (t == TypeManager.double_type)
481 return new DoubleConstant ((double) v);
482 else if (t == TypeManager.string_type)
483 return new StringConstant ((string) v);
484 else if (t == TypeManager.short_type)
485 return new ShortConstant ((short)v);
486 else if (t == TypeManager.ushort_type)
487 return new UShortConstant ((ushort)v);
488 else if (t == TypeManager.sbyte_type)
489 return new SByteConstant (((sbyte)v));
490 else if (t == TypeManager.byte_type)
491 return new ByteConstant ((byte)v);
492 else if (t == TypeManager.char_type)
493 return new CharConstant ((char)v);
494 else if (t == TypeManager.bool_type)
495 return new BoolConstant ((bool) v);
496 else if (TypeManager.IsEnumType (t)){
497 Constant e = Constantify (v, TypeManager.TypeToCoreType (v.GetType ()));
499 return new EnumConstant (e, t);
501 throw new Exception ("Unknown type for constant (" + t +
506 /// Returns a fully formed expression after a MemberLookup
508 public static Expression ExprClassFromMemberInfo (EmitContext ec, MemberInfo mi, Location loc)
511 return new EventExpr ((EventInfo) mi, loc);
512 else if (mi is FieldInfo)
513 return new FieldExpr ((FieldInfo) mi, loc);
514 else if (mi is PropertyInfo)
515 return new PropertyExpr ((PropertyInfo) mi, loc);
516 else if (mi is Type){
517 return new TypeExpr ((System.Type) mi, loc);
524 // FIXME: Probably implement a cache for (t,name,current_access_set)?
526 // This code could use some optimizations, but we need to do some
527 // measurements. For example, we could use a delegate to `flag' when
528 // something can not any longer be a method-group (because it is something
532 // If the return value is an Array, then it is an array of
535 // If the return value is an MemberInfo, it is anything, but a Method
539 // FIXME: When calling MemberLookup inside an `Invocation', we should pass
540 // the arguments here and have MemberLookup return only the methods that
541 // match the argument count/type, unlike we are doing now (we delay this
544 // This is so we can catch correctly attempts to invoke instance methods
545 // from a static body (scan for error 120 in ResolveSimpleName).
548 // FIXME: Potential optimization, have a static ArrayList
551 public static Expression MemberLookup (EmitContext ec, Type t, string name,
552 MemberTypes mt, BindingFlags bf, Location loc)
554 return MemberLookup (ec, ec.ContainerType, t, name, mt, bf, loc);
558 // Lookup type `t' for code in class `invocation_type'. Note that it's important
559 // to set `invocation_type' correctly since this method also checks whether the
560 // invoking class is allowed to access the member in class `t'. When you want to
561 // explicitly do a lookup in the base class, you must set both `t' and `invocation_type'
562 // to the base class (although a derived class can access protected members of its base
563 // class it cannot do so through an instance of the base class (error CS1540)).
566 public static Expression MemberLookup (EmitContext ec, Type invocation_type, Type t,
567 string name, MemberTypes mt, BindingFlags bf,
570 MemberInfo [] mi = TypeManager.MemberLookup (invocation_type, t, mt, bf, name);
575 int count = mi.Length;
578 return new MethodGroupExpr (mi, loc);
580 if (mi [0] is MethodBase)
581 return new MethodGroupExpr (mi, loc);
583 return ExprClassFromMemberInfo (ec, mi [0], loc);
586 public const MemberTypes AllMemberTypes =
587 MemberTypes.Constructor |
591 MemberTypes.NestedType |
592 MemberTypes.Property;
594 public const BindingFlags AllBindingFlags =
595 BindingFlags.Public |
596 BindingFlags.Static |
597 BindingFlags.Instance;
599 public static Expression MemberLookup (EmitContext ec, Type t, string name, Location loc)
601 return MemberLookup (ec, ec.ContainerType, t, name,
602 AllMemberTypes, AllBindingFlags, loc);
605 public static Expression MethodLookup (EmitContext ec, Type t, string name, Location loc)
607 return MemberLookup (ec, ec.ContainerType, t, name,
608 MemberTypes.Method, AllBindingFlags, loc);
612 /// This is a wrapper for MemberLookup that is not used to "probe", but
613 /// to find a final definition. If the final definition is not found, we
614 /// look for private members and display a useful debugging message if we
617 public static Expression MemberLookupFinal (EmitContext ec, Type t, string name,
620 return MemberLookupFinal (ec, t, name, MemberTypes.Method, AllBindingFlags, loc);
623 public static Expression MemberLookupFinal (EmitContext ec, Type t, string name,
624 MemberTypes mt, BindingFlags bf, Location loc)
628 int errors = Report.Errors;
630 e = MemberLookup (ec, ec.ContainerType, t, name, mt, bf, loc);
635 // Error has already been reported.
636 if (errors < Report.Errors)
639 e = MemberLookup (ec, t, name, AllMemberTypes,
640 AllBindingFlags | BindingFlags.NonPublic, loc);
643 117, loc, "`" + t + "' does not contain a definition " +
644 "for `" + name + "'");
647 122, loc, "`" + t + "." + name +
648 "' is inaccessible due to its protection level");
654 static public MemberInfo GetFieldFromEvent (EventExpr event_expr)
656 EventInfo ei = event_expr.EventInfo;
658 return TypeManager.GetPrivateFieldOfEvent (ei);
661 static EmptyExpression MyEmptyExpr;
662 static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
664 Type expr_type = expr.Type;
666 if (expr_type == null && expr.eclass == ExprClass.MethodGroup){
667 // if we are a method group, emit a warning
673 // notice that it is possible to write "ValueType v = 1", the ValueType here
674 // is an abstract class, and not really a value type, so we apply the same rules.
676 if (target_type == TypeManager.object_type || target_type == TypeManager.value_type) {
678 // A pointer type cannot be converted to object
680 if (expr_type.IsPointer)
683 if (expr_type.IsValueType)
684 return new BoxedCast (expr);
685 if (expr_type.IsClass || expr_type.IsInterface)
686 return new EmptyCast (expr, target_type);
687 } else if (expr_type.IsSubclassOf (target_type)) {
689 // Special case: enumeration to System.Enum.
690 // System.Enum is not a value type, it is a class, so we need
691 // a boxing conversion
693 if (expr_type.IsEnum)
694 return new BoxedCast (expr);
696 return new EmptyCast (expr, target_type);
699 // This code is kind of mirrored inside StandardConversionExists
700 // with the small distinction that we only probe there
702 // Always ensure that the code here and there is in sync
704 // from the null type to any reference-type.
705 if (expr is NullLiteral && !target_type.IsValueType)
706 return new EmptyCast (expr, target_type);
708 // from any class-type S to any interface-type T.
709 if (target_type.IsInterface) {
710 if (TypeManager.ImplementsInterface (expr_type, target_type)){
711 if (expr_type.IsClass)
712 return new EmptyCast (expr, target_type);
713 else if (expr_type.IsValueType)
714 return new BoxedCast (expr);
718 // from any interface type S to interface-type T.
719 if (expr_type.IsInterface && target_type.IsInterface) {
720 if (TypeManager.ImplementsInterface (expr_type, target_type))
721 return new EmptyCast (expr, target_type);
726 // from an array-type S to an array-type of type T
727 if (expr_type.IsArray && target_type.IsArray) {
728 if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
730 Type expr_element_type = expr_type.GetElementType ();
732 if (MyEmptyExpr == null)
733 MyEmptyExpr = new EmptyExpression ();
735 MyEmptyExpr.SetType (expr_element_type);
736 Type target_element_type = target_type.GetElementType ();
738 if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
739 if (StandardConversionExists (MyEmptyExpr,
740 target_element_type))
741 return new EmptyCast (expr, target_type);
746 // from an array-type to System.Array
747 if (expr_type.IsArray && target_type == TypeManager.array_type)
748 return new EmptyCast (expr, target_type);
750 // from any delegate type to System.Delegate
751 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
752 target_type == TypeManager.delegate_type)
753 return new EmptyCast (expr, target_type);
755 // from any array-type or delegate type into System.ICloneable.
756 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
757 if (target_type == TypeManager.icloneable_type)
758 return new EmptyCast (expr, target_type);
768 /// Implicit Numeric Conversions.
770 /// expr is the expression to convert, returns a new expression of type
771 /// target_type or null if an implicit conversion is not possible.
773 static public Expression ImplicitNumericConversion (EmitContext ec, Expression expr,
774 Type target_type, Location loc)
776 Type expr_type = expr.Type;
779 // Attempt to do the implicit constant expression conversions
781 if (expr is IntConstant){
784 e = TryImplicitIntConversion (target_type, (IntConstant) expr);
788 } else if (expr is LongConstant && target_type == TypeManager.uint64_type){
790 // Try the implicit constant expression conversion
791 // from long to ulong, instead of a nice routine,
794 long v = ((LongConstant) expr).Value;
796 return new ULongConstant ((ulong) v);
799 Type real_target_type = target_type;
801 if (expr_type == TypeManager.sbyte_type){
803 // From sbyte to short, int, long, float, double.
805 if (real_target_type == TypeManager.int32_type)
806 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
807 if (real_target_type == TypeManager.int64_type)
808 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
809 if (real_target_type == TypeManager.double_type)
810 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
811 if (real_target_type == TypeManager.float_type)
812 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
813 if (real_target_type == TypeManager.short_type)
814 return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
815 } else if (expr_type == TypeManager.byte_type){
817 // From byte to short, ushort, int, uint, long, ulong, float, double
819 if ((real_target_type == TypeManager.short_type) ||
820 (real_target_type == TypeManager.ushort_type) ||
821 (real_target_type == TypeManager.int32_type) ||
822 (real_target_type == TypeManager.uint32_type))
823 return new EmptyCast (expr, target_type);
825 if (real_target_type == TypeManager.uint64_type)
826 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
827 if (real_target_type == TypeManager.int64_type)
828 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
829 if (real_target_type == TypeManager.float_type)
830 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
831 if (real_target_type == TypeManager.double_type)
832 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
833 } else if (expr_type == TypeManager.short_type){
835 // From short to int, long, float, double
837 if (real_target_type == TypeManager.int32_type)
838 return new EmptyCast (expr, target_type);
839 if (real_target_type == TypeManager.int64_type)
840 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
841 if (real_target_type == TypeManager.double_type)
842 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
843 if (real_target_type == TypeManager.float_type)
844 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
845 } else if (expr_type == TypeManager.ushort_type){
847 // From ushort to int, uint, long, ulong, float, double
849 if (real_target_type == TypeManager.uint32_type)
850 return new EmptyCast (expr, target_type);
852 if (real_target_type == TypeManager.uint64_type)
853 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
854 if (real_target_type == TypeManager.int32_type)
855 return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
856 if (real_target_type == TypeManager.int64_type)
857 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
858 if (real_target_type == TypeManager.double_type)
859 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
860 if (real_target_type == TypeManager.float_type)
861 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
862 } else if (expr_type == TypeManager.int32_type){
864 // From int to long, float, double
866 if (real_target_type == TypeManager.int64_type)
867 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
868 if (real_target_type == TypeManager.double_type)
869 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
870 if (real_target_type == TypeManager.float_type)
871 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
872 } else if (expr_type == TypeManager.uint32_type){
874 // From uint to long, ulong, float, double
876 if (real_target_type == TypeManager.int64_type)
877 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
878 if (real_target_type == TypeManager.uint64_type)
879 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
880 if (real_target_type == TypeManager.double_type)
881 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
883 if (real_target_type == TypeManager.float_type)
884 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
886 } else if (expr_type == TypeManager.int64_type){
888 // From long/ulong to float, double
890 if (real_target_type == TypeManager.double_type)
891 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
892 if (real_target_type == TypeManager.float_type)
893 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
894 } else if (expr_type == TypeManager.uint64_type){
896 // From ulong to float, double
898 if (real_target_type == TypeManager.double_type)
899 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
901 if (real_target_type == TypeManager.float_type)
902 return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
904 } else if (expr_type == TypeManager.char_type){
906 // From char to ushort, int, uint, long, ulong, float, double
908 if ((real_target_type == TypeManager.ushort_type) ||
909 (real_target_type == TypeManager.int32_type) ||
910 (real_target_type == TypeManager.uint32_type))
911 return new EmptyCast (expr, target_type);
912 if (real_target_type == TypeManager.uint64_type)
913 return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
914 if (real_target_type == TypeManager.int64_type)
915 return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
916 if (real_target_type == TypeManager.float_type)
917 return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
918 if (real_target_type == TypeManager.double_type)
919 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
920 } else if (expr_type == TypeManager.float_type){
924 if (real_target_type == TypeManager.double_type)
925 return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
932 // Tests whether an implicit reference conversion exists between expr_type
935 public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
937 Type expr_type = expr.Type;
940 // This is the boxed case.
942 if (target_type == TypeManager.object_type) {
943 if ((expr_type.IsClass) ||
944 (expr_type.IsValueType) ||
945 (expr_type.IsInterface))
948 } else if (expr_type.IsSubclassOf (target_type)) {
951 // Please remember that all code below actually comes
952 // from ImplicitReferenceConversion so make sure code remains in sync
954 // from any class-type S to any interface-type T.
955 if (target_type.IsInterface) {
956 if (TypeManager.ImplementsInterface (expr_type, target_type))
960 // from any interface type S to interface-type T.
961 if (expr_type.IsInterface && target_type.IsInterface)
962 if (TypeManager.ImplementsInterface (expr_type, target_type))
965 // from an array-type S to an array-type of type T
966 if (expr_type.IsArray && target_type.IsArray) {
967 if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
969 Type expr_element_type = expr_type.GetElementType ();
971 if (MyEmptyExpr == null)
972 MyEmptyExpr = new EmptyExpression ();
974 MyEmptyExpr.SetType (expr_element_type);
975 Type target_element_type = target_type.GetElementType ();
977 if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
978 if (StandardConversionExists (MyEmptyExpr,
979 target_element_type))
984 // from an array-type to System.Array
985 if (expr_type.IsArray && (target_type == TypeManager.array_type))
988 // from any delegate type to System.Delegate
989 if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
990 target_type == TypeManager.delegate_type)
991 if (target_type.IsAssignableFrom (expr_type))
994 // from any array-type or delegate type into System.ICloneable.
995 if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
996 if (target_type == TypeManager.icloneable_type)
999 // from the null type to any reference-type.
1000 if (expr is NullLiteral && !target_type.IsValueType &&
1001 !TypeManager.IsEnumType (target_type))
1010 /// Same as StandardConversionExists except that it also looks at
1011 /// implicit user defined conversions - needed for overload resolution
1013 public static bool ImplicitConversionExists (EmitContext ec, Expression expr, Type target_type)
1015 if (StandardConversionExists (expr, target_type) == true)
1018 Expression dummy = ImplicitUserConversion (ec, expr, target_type, Location.Null);
1027 /// Determines if a standard implicit conversion exists from
1028 /// expr_type to target_type
1030 public static bool StandardConversionExists (Expression expr, Type target_type)
1032 Type expr_type = expr.Type;
1034 if (expr_type == TypeManager.void_type)
1037 if (expr_type == target_type)
1040 // First numeric conversions
1042 if (expr_type == TypeManager.sbyte_type){
1044 // From sbyte to short, int, long, float, double.
1046 if ((target_type == TypeManager.int32_type) ||
1047 (target_type == TypeManager.int64_type) ||
1048 (target_type == TypeManager.double_type) ||
1049 (target_type == TypeManager.float_type) ||
1050 (target_type == TypeManager.short_type) ||
1051 (target_type == TypeManager.decimal_type))
1054 } else if (expr_type == TypeManager.byte_type){
1056 // From byte to short, ushort, int, uint, long, ulong, float, double
1058 if ((target_type == TypeManager.short_type) ||
1059 (target_type == TypeManager.ushort_type) ||
1060 (target_type == TypeManager.int32_type) ||
1061 (target_type == TypeManager.uint32_type) ||
1062 (target_type == TypeManager.uint64_type) ||
1063 (target_type == TypeManager.int64_type) ||
1064 (target_type == TypeManager.float_type) ||
1065 (target_type == TypeManager.double_type) ||
1066 (target_type == TypeManager.decimal_type))
1069 } else if (expr_type == TypeManager.short_type){
1071 // From short to int, long, float, double
1073 if ((target_type == TypeManager.int32_type) ||
1074 (target_type == TypeManager.int64_type) ||
1075 (target_type == TypeManager.double_type) ||
1076 (target_type == TypeManager.float_type) ||
1077 (target_type == TypeManager.decimal_type))
1080 } else if (expr_type == TypeManager.ushort_type){
1082 // From ushort to int, uint, long, ulong, float, double
1084 if ((target_type == TypeManager.uint32_type) ||
1085 (target_type == TypeManager.uint64_type) ||
1086 (target_type == TypeManager.int32_type) ||
1087 (target_type == TypeManager.int64_type) ||
1088 (target_type == TypeManager.double_type) ||
1089 (target_type == TypeManager.float_type) ||
1090 (target_type == TypeManager.decimal_type))
1093 } else if (expr_type == TypeManager.int32_type){
1095 // From int to long, float, double
1097 if ((target_type == TypeManager.int64_type) ||
1098 (target_type == TypeManager.double_type) ||
1099 (target_type == TypeManager.float_type) ||
1100 (target_type == TypeManager.decimal_type))
1103 } else if (expr_type == TypeManager.uint32_type){
1105 // From uint to long, ulong, float, double
1107 if ((target_type == TypeManager.int64_type) ||
1108 (target_type == TypeManager.uint64_type) ||
1109 (target_type == TypeManager.double_type) ||
1110 (target_type == TypeManager.float_type) ||
1111 (target_type == TypeManager.decimal_type))
1114 } else if ((expr_type == TypeManager.uint64_type) ||
1115 (expr_type == TypeManager.int64_type)) {
1117 // From long/ulong to float, double
1119 if ((target_type == TypeManager.double_type) ||
1120 (target_type == TypeManager.float_type) ||
1121 (target_type == TypeManager.decimal_type))
1124 } else if (expr_type == TypeManager.char_type){
1126 // From char to ushort, int, uint, long, ulong, float, double
1128 if ((target_type == TypeManager.ushort_type) ||
1129 (target_type == TypeManager.int32_type) ||
1130 (target_type == TypeManager.uint32_type) ||
1131 (target_type == TypeManager.uint64_type) ||
1132 (target_type == TypeManager.int64_type) ||
1133 (target_type == TypeManager.float_type) ||
1134 (target_type == TypeManager.double_type) ||
1135 (target_type == TypeManager.decimal_type))
1138 } else if (expr_type == TypeManager.float_type){
1142 if (target_type == TypeManager.double_type)
1146 if (ImplicitReferenceConversionExists (expr, target_type))
1149 if (expr is IntConstant){
1150 int value = ((IntConstant) expr).Value;
1152 if (target_type == TypeManager.sbyte_type){
1153 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1155 } else if (target_type == TypeManager.byte_type){
1156 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1158 } else if (target_type == TypeManager.short_type){
1159 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1161 } else if (target_type == TypeManager.ushort_type){
1162 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1164 } else if (target_type == TypeManager.uint32_type){
1167 } else if (target_type == TypeManager.uint64_type){
1169 // we can optimize this case: a positive int32
1170 // always fits on a uint64. But we need an opcode
1177 if (value == 0 && expr is IntLiteral && TypeManager.IsEnumType (target_type))
1181 if (expr is LongConstant && target_type == TypeManager.uint64_type){
1183 // Try the implicit constant expression conversion
1184 // from long to ulong, instead of a nice routine,
1185 // we just inline it
1187 long v = ((LongConstant) expr).Value;
1192 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1193 IntLiteral i = (IntLiteral) expr;
1199 if (target_type == TypeManager.void_ptr_type && expr_type.IsPointer)
1206 // Used internally by FindMostEncompassedType, this is used
1207 // to avoid creating lots of objects in the tight loop inside
1208 // FindMostEncompassedType
1210 static EmptyExpression priv_fmet_param;
1213 /// Finds "most encompassed type" according to the spec (13.4.2)
1214 /// amongst the methods in the MethodGroupExpr
1216 static Type FindMostEncompassedType (ArrayList types)
1220 if (priv_fmet_param == null)
1221 priv_fmet_param = new EmptyExpression ();
1223 foreach (Type t in types){
1224 priv_fmet_param.SetType (t);
1231 if (StandardConversionExists (priv_fmet_param, best))
1239 // Used internally by FindMostEncompassingType, this is used
1240 // to avoid creating lots of objects in the tight loop inside
1241 // FindMostEncompassingType
1243 static EmptyExpression priv_fmee_ret;
1246 /// Finds "most encompassing type" according to the spec (13.4.2)
1247 /// amongst the types in the given set
1249 static Type FindMostEncompassingType (ArrayList types)
1253 if (priv_fmee_ret == null)
1254 priv_fmee_ret = new EmptyExpression ();
1256 foreach (Type t in types){
1257 priv_fmee_ret.SetType (best);
1264 if (StandardConversionExists (priv_fmee_ret, t))
1272 // Used to avoid creating too many objects
1274 static EmptyExpression priv_fms_expr;
1277 /// Finds the most specific source Sx according to the rules of the spec (13.4.4)
1278 /// by making use of FindMostEncomp* methods. Applies the correct rules separately
1279 /// for explicit and implicit conversion operators.
1281 static public Type FindMostSpecificSource (MethodGroupExpr me, Expression source,
1282 bool apply_explicit_conv_rules,
1285 ArrayList src_types_set = new ArrayList ();
1287 if (priv_fms_expr == null)
1288 priv_fms_expr = new EmptyExpression ();
1291 // If any operator converts from S then Sx = S
1293 Type source_type = source.Type;
1294 foreach (MethodBase mb in me.Methods){
1295 ParameterData pd = Invocation.GetParameterData (mb);
1296 Type param_type = pd.ParameterType (0);
1298 if (param_type == source_type)
1301 if (apply_explicit_conv_rules) {
1304 // Find the set of applicable user-defined conversion operators, U. This set
1306 // user-defined implicit or explicit conversion operators declared by
1307 // the classes or structs in D that convert from a type encompassing
1308 // or encompassed by S to a type encompassing or encompassed by T
1310 priv_fms_expr.SetType (param_type);
1311 if (StandardConversionExists (priv_fms_expr, source_type))
1312 src_types_set.Add (param_type);
1314 if (StandardConversionExists (source, param_type))
1315 src_types_set.Add (param_type);
1319 // Only if S is encompassed by param_type
1321 if (StandardConversionExists (source, param_type))
1322 src_types_set.Add (param_type);
1327 // Explicit Conv rules
1329 if (apply_explicit_conv_rules) {
1330 ArrayList candidate_set = new ArrayList ();
1332 foreach (Type param_type in src_types_set){
1333 if (StandardConversionExists (source, param_type))
1334 candidate_set.Add (param_type);
1337 if (candidate_set.Count != 0)
1338 return FindMostEncompassedType (candidate_set);
1344 if (apply_explicit_conv_rules)
1345 return FindMostEncompassingType (src_types_set);
1347 return FindMostEncompassedType (src_types_set);
1351 // Useful in avoiding proliferation of objects
1353 static EmptyExpression priv_fmt_expr;
1356 /// Finds the most specific target Tx according to section 13.4.4
1358 static public Type FindMostSpecificTarget (MethodGroupExpr me, Type target,
1359 bool apply_explicit_conv_rules,
1362 ArrayList tgt_types_set = new ArrayList ();
1364 if (priv_fmt_expr == null)
1365 priv_fmt_expr = new EmptyExpression ();
1368 // If any operator converts to T then Tx = T
1370 foreach (MethodInfo mi in me.Methods){
1371 Type ret_type = mi.ReturnType;
1373 if (ret_type == target)
1376 if (apply_explicit_conv_rules) {
1379 // Find the set of applicable user-defined conversion operators, U.
1381 // This set consists of the
1382 // user-defined implicit or explicit conversion operators declared by
1383 // the classes or structs in D that convert from a type encompassing
1384 // or encompassed by S to a type encompassing or encompassed by T
1386 priv_fms_expr.SetType (ret_type);
1387 if (StandardConversionExists (priv_fms_expr, target))
1388 tgt_types_set.Add (ret_type);
1390 priv_fms_expr.SetType (target);
1391 if (StandardConversionExists (priv_fms_expr, ret_type))
1392 tgt_types_set.Add (ret_type);
1396 // Only if T is encompassed by param_type
1398 priv_fms_expr.SetType (ret_type);
1399 if (StandardConversionExists (priv_fms_expr, target))
1400 tgt_types_set.Add (ret_type);
1405 // Explicit conv rules
1407 if (apply_explicit_conv_rules) {
1408 ArrayList candidate_set = new ArrayList ();
1410 foreach (Type ret_type in tgt_types_set){
1411 priv_fmt_expr.SetType (ret_type);
1413 if (StandardConversionExists (priv_fmt_expr, target))
1414 candidate_set.Add (ret_type);
1417 if (candidate_set.Count != 0)
1418 return FindMostEncompassingType (candidate_set);
1422 // Okay, final case !
1424 if (apply_explicit_conv_rules)
1425 return FindMostEncompassedType (tgt_types_set);
1427 return FindMostEncompassingType (tgt_types_set);
1431 /// User-defined Implicit conversions
1433 static public Expression ImplicitUserConversion (EmitContext ec, Expression source,
1434 Type target, Location loc)
1436 return UserDefinedConversion (ec, source, target, loc, false);
1440 /// User-defined Explicit conversions
1442 static public Expression ExplicitUserConversion (EmitContext ec, Expression source,
1443 Type target, Location loc)
1445 return UserDefinedConversion (ec, source, target, loc, true);
1449 /// Computes the MethodGroup for the user-defined conversion
1450 /// operators from source_type to target_type. `look_for_explicit'
1451 /// controls whether we should also include the list of explicit
1454 static MethodGroupExpr GetConversionOperators (EmitContext ec,
1455 Type source_type, Type target_type,
1456 Location loc, bool look_for_explicit)
1458 Expression mg1 = null, mg2 = null;
1459 Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
1463 // FIXME : How does the False operator come into the picture ?
1464 // This doesn't look complete and very correct !
1466 if (target_type == TypeManager.bool_type && !look_for_explicit)
1467 op_name = "op_True";
1469 op_name = "op_Implicit";
1471 MethodGroupExpr union3;
1473 mg1 = MethodLookup (ec, source_type, op_name, loc);
1474 if (source_type.BaseType != null)
1475 mg2 = MethodLookup (ec, source_type.BaseType, op_name, loc);
1478 union3 = (MethodGroupExpr) mg2;
1479 else if (mg2 == null)
1480 union3 = (MethodGroupExpr) mg1;
1482 union3 = Invocation.MakeUnionSet (mg1, mg2, loc);
1484 mg1 = MethodLookup (ec, target_type, op_name, loc);
1487 union3 = Invocation.MakeUnionSet (union3, mg1, loc);
1489 union3 = (MethodGroupExpr) mg1;
1492 if (target_type.BaseType != null)
1493 mg1 = MethodLookup (ec, target_type.BaseType, op_name, loc);
1497 union3 = Invocation.MakeUnionSet (union3, mg1, loc);
1499 union3 = (MethodGroupExpr) mg1;
1502 MethodGroupExpr union4 = null;
1504 if (look_for_explicit) {
1505 op_name = "op_Explicit";
1507 mg5 = MemberLookup (ec, source_type, op_name, loc);
1508 if (source_type.BaseType != null)
1509 mg6 = MethodLookup (ec, source_type.BaseType, op_name, loc);
1511 mg7 = MemberLookup (ec, target_type, op_name, loc);
1512 if (target_type.BaseType != null)
1513 mg8 = MethodLookup (ec, target_type.BaseType, op_name, loc);
1515 MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6, loc);
1516 MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8, loc);
1518 union4 = Invocation.MakeUnionSet (union5, union6, loc);
1521 return Invocation.MakeUnionSet (union3, union4, loc);
1525 /// User-defined conversions
1527 static public Expression UserDefinedConversion (EmitContext ec, Expression source,
1528 Type target, Location loc,
1529 bool look_for_explicit)
1531 MethodGroupExpr union;
1532 Type source_type = source.Type;
1533 MethodBase method = null;
1535 union = GetConversionOperators (ec, source_type, target, loc, look_for_explicit);
1539 Type most_specific_source, most_specific_target;
1542 foreach (MethodBase m in union.Methods){
1543 Console.WriteLine ("Name: " + m.Name);
1544 Console.WriteLine (" : " + ((MethodInfo)m).ReturnType);
1548 most_specific_source = FindMostSpecificSource (union, source, look_for_explicit, loc);
1549 if (most_specific_source == null)
1552 most_specific_target = FindMostSpecificTarget (union, target, look_for_explicit, loc);
1553 if (most_specific_target == null)
1558 foreach (MethodBase mb in union.Methods){
1559 ParameterData pd = Invocation.GetParameterData (mb);
1560 MethodInfo mi = (MethodInfo) mb;
1562 if (pd.ParameterType (0) == most_specific_source &&
1563 mi.ReturnType == most_specific_target) {
1569 if (method == null || count > 1) {
1570 Report.Error (-11, loc, "Ambiguous user defined conversion");
1575 // This will do the conversion to the best match that we
1576 // found. Now we need to perform an implict standard conversion
1577 // if the best match was not the type that we were requested
1580 if (look_for_explicit)
1581 source = ConvertExplicitStandard (ec, source, most_specific_source, loc);
1583 source = ConvertImplicitStandard (ec, source, most_specific_source, loc);
1589 e = new UserCast ((MethodInfo) method, source, loc);
1590 if (e.Type != target){
1591 if (!look_for_explicit)
1592 e = ConvertImplicitStandard (ec, e, target, loc);
1594 e = ConvertExplicitStandard (ec, e, target, loc);
1600 /// Converts implicitly the resolved expression `expr' into the
1601 /// `target_type'. It returns a new expression that can be used
1602 /// in a context that expects a `target_type'.
1604 static public Expression ConvertImplicit (EmitContext ec, Expression expr,
1605 Type target_type, Location loc)
1607 Type expr_type = expr.Type;
1610 if (expr_type == target_type)
1613 if (target_type == null)
1614 throw new Exception ("Target type is null");
1616 e = ConvertImplicitStandard (ec, expr, target_type, loc);
1620 e = ImplicitUserConversion (ec, expr, target_type, loc);
1629 /// Attempts to apply the `Standard Implicit
1630 /// Conversion' rules to the expression `expr' into
1631 /// the `target_type'. It returns a new expression
1632 /// that can be used in a context that expects a
1635 /// This is different from `ConvertImplicit' in that the
1636 /// user defined implicit conversions are excluded.
1638 static public Expression ConvertImplicitStandard (EmitContext ec, Expression expr,
1639 Type target_type, Location loc)
1641 Type expr_type = expr.Type;
1644 if (expr_type == target_type)
1647 e = ImplicitNumericConversion (ec, expr, target_type, loc);
1651 e = ImplicitReferenceConversion (expr, target_type);
1655 if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
1656 IntLiteral i = (IntLiteral) expr;
1659 return new EmptyCast (expr, target_type);
1663 if (expr_type.IsPointer){
1664 if (target_type == TypeManager.void_ptr_type)
1665 return new EmptyCast (expr, target_type);
1668 // yep, comparing pointer types cant be done with
1669 // t1 == t2, we have to compare their element types.
1671 if (target_type.IsPointer){
1672 if (target_type.GetElementType()==expr_type.GetElementType())
1677 if (target_type.IsPointer){
1678 if (expr is NullLiteral)
1679 return new EmptyCast (expr, target_type);
1687 /// Attemps to perform an implict constant conversion of the IntConstant
1688 /// into a different data type using casts (See Implicit Constant
1689 /// Expression Conversions)
1691 static protected Expression TryImplicitIntConversion (Type target_type, IntConstant ic)
1693 int value = ic.Value;
1696 // FIXME: This could return constants instead of EmptyCasts
1698 if (target_type == TypeManager.sbyte_type){
1699 if (value >= SByte.MinValue && value <= SByte.MaxValue)
1700 return new SByteConstant ((sbyte) value);
1701 } else if (target_type == TypeManager.byte_type){
1702 if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
1703 return new ByteConstant ((byte) value);
1704 } else if (target_type == TypeManager.short_type){
1705 if (value >= Int16.MinValue && value <= Int16.MaxValue)
1706 return new ShortConstant ((short) value);
1707 } else if (target_type == TypeManager.ushort_type){
1708 if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
1709 return new UShortConstant ((ushort) value);
1710 } else if (target_type == TypeManager.uint32_type){
1712 return new UIntConstant ((uint) value);
1713 } else if (target_type == TypeManager.uint64_type){
1715 // we can optimize this case: a positive int32
1716 // always fits on a uint64. But we need an opcode
1720 return new ULongConstant ((ulong) value);
1723 if (value == 0 && ic is IntLiteral && TypeManager.IsEnumType (target_type)){
1724 Type underlying = TypeManager.EnumToUnderlying (target_type);
1725 Constant e = (Constant) ic;
1728 // Possibly, we need to create a different 0 literal before passing
1731 if (underlying == TypeManager.int64_type)
1732 e = new LongLiteral (0);
1733 else if (underlying == TypeManager.uint64_type)
1734 e = new ULongLiteral (0);
1736 return new EnumConstant (e, target_type);
1741 static public void Error_CannotConvertImplicit (Location loc, Type source, Type target)
1743 string msg = "Cannot convert implicitly from `"+
1744 TypeManager.CSharpName (source) + "' to `" +
1745 TypeManager.CSharpName (target) + "'";
1747 Report.Error (29, loc, msg);
1751 /// Attemptes to implicityly convert `target' into `type', using
1752 /// ConvertImplicit. If there is no implicit conversion, then
1753 /// an error is signaled
1755 static public Expression ConvertImplicitRequired (EmitContext ec, Expression source,
1756 Type target_type, Location loc)
1760 e = ConvertImplicit (ec, source, target_type, loc);
1764 if (source is DoubleLiteral && target_type == TypeManager.float_type){
1765 Report.Error (664, loc,
1766 "Double literal cannot be implicitly converted to " +
1767 "float type, use F suffix to create a float literal");
1770 Error_CannotConvertImplicit (loc, source.Type, target_type);
1776 /// Performs the explicit numeric conversions
1778 static Expression ConvertNumericExplicit (EmitContext ec, Expression expr, Type target_type, Location loc)
1780 Type expr_type = expr.Type;
1783 // If we have an enumeration, extract the underlying type,
1784 // use this during the comparison, but wrap around the original
1787 Type real_target_type = target_type;
1789 if (TypeManager.IsEnumType (real_target_type))
1790 real_target_type = TypeManager.EnumToUnderlying (real_target_type);
1792 if (StandardConversionExists (expr, real_target_type)){
1793 Expression ce = ConvertImplicitStandard (ec, expr, real_target_type, loc);
1795 if (real_target_type != target_type)
1796 return new EmptyCast (ce, target_type);
1800 if (expr_type == TypeManager.sbyte_type){
1802 // From sbyte to byte, ushort, uint, ulong, char
1804 if (real_target_type == TypeManager.byte_type)
1805 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U1);
1806 if (real_target_type == TypeManager.ushort_type)
1807 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U2);
1808 if (real_target_type == TypeManager.uint32_type)
1809 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U4);
1810 if (real_target_type == TypeManager.uint64_type)
1811 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U8);
1812 if (real_target_type == TypeManager.char_type)
1813 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_CH);
1814 } else if (expr_type == TypeManager.byte_type){
1816 // From byte to sbyte and char
1818 if (real_target_type == TypeManager.sbyte_type)
1819 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_I1);
1820 if (real_target_type == TypeManager.char_type)
1821 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_CH);
1822 } else if (expr_type == TypeManager.short_type){
1824 // From short to sbyte, byte, ushort, uint, ulong, char
1826 if (real_target_type == TypeManager.sbyte_type)
1827 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_I1);
1828 if (real_target_type == TypeManager.byte_type)
1829 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U1);
1830 if (real_target_type == TypeManager.ushort_type)
1831 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U2);
1832 if (real_target_type == TypeManager.uint32_type)
1833 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U4);
1834 if (real_target_type == TypeManager.uint64_type)
1835 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U8);
1836 if (real_target_type == TypeManager.char_type)
1837 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_CH);
1838 } else if (expr_type == TypeManager.ushort_type){
1840 // From ushort to sbyte, byte, short, char
1842 if (real_target_type == TypeManager.sbyte_type)
1843 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I1);
1844 if (real_target_type == TypeManager.byte_type)
1845 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_U1);
1846 if (real_target_type == TypeManager.short_type)
1847 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I2);
1848 if (real_target_type == TypeManager.char_type)
1849 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_CH);
1850 } else if (expr_type == TypeManager.int32_type){
1852 // From int to sbyte, byte, short, ushort, uint, ulong, char
1854 if (real_target_type == TypeManager.sbyte_type)
1855 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I1);
1856 if (real_target_type == TypeManager.byte_type)
1857 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U1);
1858 if (real_target_type == TypeManager.short_type)
1859 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I2);
1860 if (real_target_type == TypeManager.ushort_type)
1861 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U2);
1862 if (real_target_type == TypeManager.uint32_type)
1863 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U4);
1864 if (real_target_type == TypeManager.uint64_type)
1865 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U8);
1866 if (real_target_type == TypeManager.char_type)
1867 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_CH);
1868 } else if (expr_type == TypeManager.uint32_type){
1870 // From uint to sbyte, byte, short, ushort, int, char
1872 if (real_target_type == TypeManager.sbyte_type)
1873 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I1);
1874 if (real_target_type == TypeManager.byte_type)
1875 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U1);
1876 if (real_target_type == TypeManager.short_type)
1877 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I2);
1878 if (real_target_type == TypeManager.ushort_type)
1879 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U2);
1880 if (real_target_type == TypeManager.int32_type)
1881 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I4);
1882 if (real_target_type == TypeManager.char_type)
1883 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_CH);
1884 } else if (expr_type == TypeManager.int64_type){
1886 // From long to sbyte, byte, short, ushort, int, uint, ulong, char
1888 if (real_target_type == TypeManager.sbyte_type)
1889 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I1);
1890 if (real_target_type == TypeManager.byte_type)
1891 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U1);
1892 if (real_target_type == TypeManager.short_type)
1893 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I2);
1894 if (real_target_type == TypeManager.ushort_type)
1895 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U2);
1896 if (real_target_type == TypeManager.int32_type)
1897 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I4);
1898 if (real_target_type == TypeManager.uint32_type)
1899 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U4);
1900 if (real_target_type == TypeManager.uint64_type)
1901 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U8);
1902 if (real_target_type == TypeManager.char_type)
1903 return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_CH);
1904 } else if (expr_type == TypeManager.uint64_type){
1906 // From ulong to sbyte, byte, short, ushort, int, uint, long, char
1908 if (real_target_type == TypeManager.sbyte_type)
1909 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I1);
1910 if (real_target_type == TypeManager.byte_type)
1911 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U1);
1912 if (real_target_type == TypeManager.short_type)
1913 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I2);
1914 if (real_target_type == TypeManager.ushort_type)
1915 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U2);
1916 if (real_target_type == TypeManager.int32_type)
1917 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I4);
1918 if (real_target_type == TypeManager.uint32_type)
1919 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U4);
1920 if (real_target_type == TypeManager.int64_type)
1921 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I8);
1922 if (real_target_type == TypeManager.char_type)
1923 return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_CH);
1924 } else if (expr_type == TypeManager.char_type){
1926 // From char to sbyte, byte, short
1928 if (real_target_type == TypeManager.sbyte_type)
1929 return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I1);
1930 if (real_target_type == TypeManager.byte_type)
1931 return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_U1);
1932 if (real_target_type == TypeManager.short_type)
1933 return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I2);
1934 } else if (expr_type == TypeManager.float_type){
1936 // From float to sbyte, byte, short,
1937 // ushort, int, uint, long, ulong, char
1940 if (real_target_type == TypeManager.sbyte_type)
1941 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I1);
1942 if (real_target_type == TypeManager.byte_type)
1943 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U1);
1944 if (real_target_type == TypeManager.short_type)
1945 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I2);
1946 if (real_target_type == TypeManager.ushort_type)
1947 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U2);
1948 if (real_target_type == TypeManager.int32_type)
1949 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I4);
1950 if (real_target_type == TypeManager.uint32_type)
1951 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U4);
1952 if (real_target_type == TypeManager.int64_type)
1953 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I8);
1954 if (real_target_type == TypeManager.uint64_type)
1955 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U8);
1956 if (real_target_type == TypeManager.char_type)
1957 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_CH);
1958 } else if (expr_type == TypeManager.double_type){
1960 // From double to byte, byte, short,
1961 // ushort, int, uint, long, ulong,
1962 // char, float or decimal
1964 if (real_target_type == TypeManager.sbyte_type)
1965 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I1);
1966 if (real_target_type == TypeManager.byte_type)
1967 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U1);
1968 if (real_target_type == TypeManager.short_type)
1969 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I2);
1970 if (real_target_type == TypeManager.ushort_type)
1971 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U2);
1972 if (real_target_type == TypeManager.int32_type)
1973 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I4);
1974 if (real_target_type == TypeManager.uint32_type)
1975 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U4);
1976 if (real_target_type == TypeManager.int64_type)
1977 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I8);
1978 if (real_target_type == TypeManager.uint64_type)
1979 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U8);
1980 if (real_target_type == TypeManager.char_type)
1981 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_CH);
1982 if (real_target_type == TypeManager.float_type)
1983 return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_R4);
1986 // decimal is taken care of by the op_Explicit methods.
1992 /// Returns whether an explicit reference conversion can be performed
1993 /// from source_type to target_type
1995 public static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
1997 bool target_is_value_type = target_type.IsValueType;
1999 if (source_type == target_type)
2003 // From object to any reference type
2005 if (source_type == TypeManager.object_type && !target_is_value_type)
2009 // From any class S to any class-type T, provided S is a base class of T
2011 if (target_type.IsSubclassOf (source_type))
2015 // From any interface type S to any interface T provided S is not derived from T
2017 if (source_type.IsInterface && target_type.IsInterface){
2018 if (!target_type.IsSubclassOf (source_type))
2023 // From any class type S to any interface T, provided S is not sealed
2024 // and provided S does not implement T.
2026 if (target_type.IsInterface && !source_type.IsSealed &&
2027 !TypeManager.ImplementsInterface (source_type, target_type))
2031 // From any interface-type S to to any class type T, provided T is not
2032 // sealed, or provided T implements S.
2034 if (source_type.IsInterface &&
2035 (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type)))
2039 // From an array type S with an element type Se to an array type T with an
2040 // element type Te provided all the following are true:
2041 // * S and T differe only in element type, in other words, S and T
2042 // have the same number of dimensions.
2043 // * Both Se and Te are reference types
2044 // * An explicit referenc conversions exist from Se to Te
2046 if (source_type.IsArray && target_type.IsArray) {
2047 if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
2049 Type source_element_type = source_type.GetElementType ();
2050 Type target_element_type = target_type.GetElementType ();
2052 if (!source_element_type.IsValueType && !target_element_type.IsValueType)
2053 if (ExplicitReferenceConversionExists (source_element_type,
2054 target_element_type))
2060 // From System.Array to any array-type
2061 if (source_type == TypeManager.array_type &&
2062 target_type.IsArray){
2067 // From System delegate to any delegate-type
2069 if (source_type == TypeManager.delegate_type &&
2070 target_type.IsSubclassOf (TypeManager.delegate_type))
2074 // From ICloneable to Array or Delegate types
2076 if (source_type == TypeManager.icloneable_type &&
2077 (target_type == TypeManager.array_type ||
2078 target_type == TypeManager.delegate_type))
2085 /// Implements Explicit Reference conversions
2087 static Expression ConvertReferenceExplicit (Expression source, Type target_type)
2089 Type source_type = source.Type;
2090 bool target_is_value_type = target_type.IsValueType;
2093 // From object to any reference type
2095 if (source_type == TypeManager.object_type && !target_is_value_type)
2096 return new ClassCast (source, target_type);
2100 // From any class S to any class-type T, provided S is a base class of T
2102 if (target_type.IsSubclassOf (source_type))
2103 return new ClassCast (source, target_type);
2106 // From any interface type S to any interface T provided S is not derived from T
2108 if (source_type.IsInterface && target_type.IsInterface){
2109 if (TypeManager.ImplementsInterface (source_type, target_type))
2112 return new ClassCast (source, target_type);
2116 // From any class type S to any interface T, provides S is not sealed
2117 // and provided S does not implement T.
2119 if (target_type.IsInterface && !source_type.IsSealed) {
2120 if (TypeManager.ImplementsInterface (source_type, target_type))
2123 return new ClassCast (source, target_type);
2128 // From any interface-type S to to any class type T, provided T is not
2129 // sealed, or provided T implements S.
2131 if (source_type.IsInterface) {
2132 if (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type))
2133 return new ClassCast (source, target_type);
2138 // From an array type S with an element type Se to an array type T with an
2139 // element type Te provided all the following are true:
2140 // * S and T differe only in element type, in other words, S and T
2141 // have the same number of dimensions.
2142 // * Both Se and Te are reference types
2143 // * An explicit referenc conversions exist from Se to Te
2145 if (source_type.IsArray && target_type.IsArray) {
2146 if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
2148 Type source_element_type = source_type.GetElementType ();
2149 Type target_element_type = target_type.GetElementType ();
2151 if (!source_element_type.IsValueType && !target_element_type.IsValueType)
2152 if (ExplicitReferenceConversionExists (source_element_type,
2153 target_element_type))
2154 return new ClassCast (source, target_type);
2159 // From System.Array to any array-type
2160 if (source_type == TypeManager.array_type &&
2161 target_type.IsArray) {
2162 return new ClassCast (source, target_type);
2166 // From System delegate to any delegate-type
2168 if (source_type == TypeManager.delegate_type &&
2169 target_type.IsSubclassOf (TypeManager.delegate_type))
2170 return new ClassCast (source, target_type);
2173 // From ICloneable to Array or Delegate types
2175 if (source_type == TypeManager.icloneable_type &&
2176 (target_type == TypeManager.array_type ||
2177 target_type == TypeManager.delegate_type))
2178 return new ClassCast (source, target_type);
2184 /// Performs an explicit conversion of the expression `expr' whose
2185 /// type is expr.Type to `target_type'.
2187 static public Expression ConvertExplicit (EmitContext ec, Expression expr,
2188 Type target_type, Location loc)
2190 Type expr_type = expr.Type;
2191 Expression ne = ConvertImplicitStandard (ec, expr, target_type, loc);
2196 ne = ConvertNumericExplicit (ec, expr, target_type, loc);
2201 // Unboxing conversion.
2203 if (expr_type == TypeManager.object_type && target_type.IsValueType)
2204 return new UnboxCast (expr, target_type);
2209 if (expr_type.IsSubclassOf (TypeManager.enum_type)) {
2213 // FIXME: Is there any reason we should have EnumConstant
2214 // dealt with here instead of just using always the
2215 // UnderlyingSystemType to wrap the type?
2217 if (expr is EnumConstant)
2218 e = ((EnumConstant) expr).Child;
2220 e = new EmptyCast (expr, TypeManager.EnumToUnderlying (expr_type));
2223 Expression t = ConvertImplicit (ec, e, target_type, loc);
2227 t = ConvertNumericExplicit (ec, e, target_type, loc);
2231 Error_CannotConvertType (loc, expr_type, target_type);
2235 ne = ConvertReferenceExplicit (expr, target_type);
2240 if (target_type.IsPointer){
2241 if (expr_type.IsPointer)
2242 return new EmptyCast (expr, target_type);
2244 if (expr_type == TypeManager.sbyte_type ||
2245 expr_type == TypeManager.byte_type ||
2246 expr_type == TypeManager.short_type ||
2247 expr_type == TypeManager.ushort_type ||
2248 expr_type == TypeManager.int32_type ||
2249 expr_type == TypeManager.uint32_type ||
2250 expr_type == TypeManager.uint64_type ||
2251 expr_type == TypeManager.int64_type)
2252 return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
2254 if (expr_type.IsPointer){
2255 if (target_type == TypeManager.sbyte_type ||
2256 target_type == TypeManager.byte_type ||
2257 target_type == TypeManager.short_type ||
2258 target_type == TypeManager.ushort_type ||
2259 target_type == TypeManager.int32_type ||
2260 target_type == TypeManager.uint32_type ||
2261 target_type == TypeManager.uint64_type ||
2262 target_type == TypeManager.int64_type){
2263 Expression e = new EmptyCast (expr, TypeManager.uint32_type);
2266 ci = ConvertImplicitStandard (ec, e, target_type, loc);
2271 ce = ConvertNumericExplicit (ec, e, target_type, loc);
2275 // We should always be able to go from an uint32
2276 // implicitly or explicitly to the other integral
2279 throw new Exception ("Internal compiler error");
2284 ne = ExplicitUserConversion (ec, expr, target_type, loc);
2288 Error_CannotConvertType (loc, expr_type, target_type);
2293 /// Same as ConvertExplicit, only it doesn't include user defined conversions
2295 static public Expression ConvertExplicitStandard (EmitContext ec, Expression expr,
2296 Type target_type, Location l)
2298 Expression ne = ConvertImplicitStandard (ec, expr, target_type, l);
2303 ne = ConvertNumericExplicit (ec, expr, target_type, l);
2307 ne = ConvertReferenceExplicit (expr, target_type);
2311 Error_CannotConvertType (l, expr.Type, target_type);
2315 static string ExprClassName (ExprClass c)
2318 case ExprClass.Invalid:
2320 case ExprClass.Value:
2322 case ExprClass.Variable:
2324 case ExprClass.Namespace:
2326 case ExprClass.Type:
2328 case ExprClass.MethodGroup:
2329 return "method group";
2330 case ExprClass.PropertyAccess:
2331 return "property access";
2332 case ExprClass.EventAccess:
2333 return "event access";
2334 case ExprClass.IndexerAccess:
2335 return "indexer access";
2336 case ExprClass.Nothing:
2339 throw new Exception ("Should not happen");
2343 /// Reports that we were expecting `expr' to be of class `expected'
2345 public void Error118 (string expected)
2347 string kind = "Unknown";
2349 kind = ExprClassName (eclass);
2351 Error (118, "Expression denotes a `" + kind +
2352 "' where a `" + expected + "' was expected");
2355 public void Error118 (ResolveFlags flags)
2357 ArrayList valid = new ArrayList (10);
2359 if ((flags & ResolveFlags.VariableOrValue) != 0) {
2360 valid.Add ("variable");
2361 valid.Add ("value");
2364 if ((flags & ResolveFlags.Type) != 0)
2367 if ((flags & ResolveFlags.MethodGroup) != 0)
2368 valid.Add ("method group");
2370 if ((flags & ResolveFlags.SimpleName) != 0)
2371 valid.Add ("simple name");
2373 if (valid.Count == 0)
2374 valid.Add ("unknown");
2376 StringBuilder sb = new StringBuilder ();
2377 for (int i = 0; i < valid.Count; i++) {
2380 else if (i == valid.Count)
2382 sb.Append (valid [i]);
2385 string kind = ExprClassName (eclass);
2387 Error (119, "Expression denotes a `" + kind + "' where " +
2388 "a `" + sb.ToString () + "' was expected");
2391 static void Error_ConstantValueCannotBeConverted (Location l, string val, Type t)
2393 Report.Error (31, l, "Constant value `" + val + "' cannot be converted to " +
2394 TypeManager.CSharpName (t));
2397 public static void UnsafeError (Location loc)
2399 Report.Error (214, loc, "Pointers may only be used in an unsafe context");
2403 /// Converts the IntConstant, UIntConstant, LongConstant or
2404 /// ULongConstant into the integral target_type. Notice
2405 /// that we do not return an `Expression' we do return
2406 /// a boxed integral type.
2408 /// FIXME: Since I added the new constants, we need to
2409 /// also support conversions from CharConstant, ByteConstant,
2410 /// SByteConstant, UShortConstant, ShortConstant
2412 /// This is used by the switch statement, so the domain
2413 /// of work is restricted to the literals above, and the
2414 /// targets are int32, uint32, char, byte, sbyte, ushort,
2415 /// short, uint64 and int64
2417 public static object ConvertIntLiteral (Constant c, Type target_type, Location loc)
2421 if (c.Type == target_type)
2422 return ((Constant) c).GetValue ();
2425 // Make into one of the literals we handle, we dont really care
2426 // about this value as we will just return a few limited types
2428 if (c is EnumConstant)
2429 c = ((EnumConstant)c).WidenToCompilerConstant ();
2431 if (c is IntConstant){
2432 int v = ((IntConstant) c).Value;
2434 if (target_type == TypeManager.uint32_type){
2437 } else if (target_type == TypeManager.char_type){
2438 if (v >= Char.MinValue && v <= Char.MaxValue)
2440 } else if (target_type == TypeManager.byte_type){
2441 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2443 } else if (target_type == TypeManager.sbyte_type){
2444 if (v >= SByte.MinValue && v <= SByte.MaxValue)
2446 } else if (target_type == TypeManager.short_type){
2447 if (v >= Int16.MinValue && v <= UInt16.MaxValue)
2449 } else if (target_type == TypeManager.ushort_type){
2450 if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
2452 } else if (target_type == TypeManager.int64_type)
2454 else if (target_type == TypeManager.uint64_type){
2460 } else if (c is UIntConstant){
2461 uint v = ((UIntConstant) c).Value;
2463 if (target_type == TypeManager.int32_type){
2464 if (v <= Int32.MaxValue)
2466 } else if (target_type == TypeManager.char_type){
2467 if (v >= Char.MinValue && v <= Char.MaxValue)
2469 } else if (target_type == TypeManager.byte_type){
2470 if (v <= Byte.MaxValue)
2472 } else if (target_type == TypeManager.sbyte_type){
2473 if (v <= SByte.MaxValue)
2475 } else if (target_type == TypeManager.short_type){
2476 if (v <= UInt16.MaxValue)
2478 } else if (target_type == TypeManager.ushort_type){
2479 if (v <= UInt16.MaxValue)
2481 } else if (target_type == TypeManager.int64_type)
2483 else if (target_type == TypeManager.uint64_type)
2486 } else if (c is LongConstant){
2487 long v = ((LongConstant) c).Value;
2489 if (target_type == TypeManager.int32_type){
2490 if (v >= UInt32.MinValue && v <= UInt32.MaxValue)
2492 } else if (target_type == TypeManager.uint32_type){
2493 if (v >= 0 && v <= UInt32.MaxValue)
2495 } else if (target_type == TypeManager.char_type){
2496 if (v >= Char.MinValue && v <= Char.MaxValue)
2498 } else if (target_type == TypeManager.byte_type){
2499 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2501 } else if (target_type == TypeManager.sbyte_type){
2502 if (v >= SByte.MinValue && v <= SByte.MaxValue)
2504 } else if (target_type == TypeManager.short_type){
2505 if (v >= Int16.MinValue && v <= UInt16.MaxValue)
2507 } else if (target_type == TypeManager.ushort_type){
2508 if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
2510 } else if (target_type == TypeManager.uint64_type){
2515 } else if (c is ULongConstant){
2516 ulong v = ((ULongConstant) c).Value;
2518 if (target_type == TypeManager.int32_type){
2519 if (v <= Int32.MaxValue)
2521 } else if (target_type == TypeManager.uint32_type){
2522 if (v <= UInt32.MaxValue)
2524 } else if (target_type == TypeManager.char_type){
2525 if (v >= Char.MinValue && v <= Char.MaxValue)
2527 } else if (target_type == TypeManager.byte_type){
2528 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2530 } else if (target_type == TypeManager.sbyte_type){
2531 if (v <= (int) SByte.MaxValue)
2533 } else if (target_type == TypeManager.short_type){
2534 if (v <= UInt16.MaxValue)
2536 } else if (target_type == TypeManager.ushort_type){
2537 if (v <= UInt16.MaxValue)
2539 } else if (target_type == TypeManager.int64_type){
2540 if (v <= Int64.MaxValue)
2544 } else if (c is ByteConstant){
2545 byte v = ((ByteConstant) c).Value;
2547 if (target_type == TypeManager.int32_type)
2549 else if (target_type == TypeManager.uint32_type)
2551 else if (target_type == TypeManager.char_type)
2553 else if (target_type == TypeManager.sbyte_type){
2554 if (v <= SByte.MaxValue)
2556 } else if (target_type == TypeManager.short_type)
2558 else if (target_type == TypeManager.ushort_type)
2560 else if (target_type == TypeManager.int64_type)
2562 else if (target_type == TypeManager.uint64_type)
2565 } else if (c is SByteConstant){
2566 sbyte v = ((SByteConstant) c).Value;
2568 if (target_type == TypeManager.int32_type)
2570 else if (target_type == TypeManager.uint32_type){
2573 } else if (target_type == TypeManager.char_type){
2576 } else if (target_type == TypeManager.byte_type){
2579 } else if (target_type == TypeManager.short_type)
2581 else if (target_type == TypeManager.ushort_type){
2584 } else if (target_type == TypeManager.int64_type)
2586 else if (target_type == TypeManager.uint64_type){
2591 } else if (c is ShortConstant){
2592 short v = ((ShortConstant) c).Value;
2594 if (target_type == TypeManager.int32_type){
2596 } else if (target_type == TypeManager.uint32_type){
2599 } else if (target_type == TypeManager.char_type){
2602 } else if (target_type == TypeManager.byte_type){
2603 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2605 } else if (target_type == TypeManager.sbyte_type){
2606 if (v >= SByte.MinValue && v <= SByte.MaxValue)
2608 } else if (target_type == TypeManager.ushort_type){
2611 } else if (target_type == TypeManager.int64_type)
2613 else if (target_type == TypeManager.uint64_type)
2617 } else if (c is UShortConstant){
2618 ushort v = ((UShortConstant) c).Value;
2620 if (target_type == TypeManager.int32_type)
2622 else if (target_type == TypeManager.uint32_type)
2624 else if (target_type == TypeManager.char_type){
2625 if (v >= Char.MinValue && v <= Char.MaxValue)
2627 } else if (target_type == TypeManager.byte_type){
2628 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2630 } else if (target_type == TypeManager.sbyte_type){
2631 if (v <= SByte.MaxValue)
2633 } else if (target_type == TypeManager.short_type){
2634 if (v <= Int16.MaxValue)
2636 } else if (target_type == TypeManager.int64_type)
2638 else if (target_type == TypeManager.uint64_type)
2642 } else if (c is CharConstant){
2643 char v = ((CharConstant) c).Value;
2645 if (target_type == TypeManager.int32_type)
2647 else if (target_type == TypeManager.uint32_type)
2649 else if (target_type == TypeManager.byte_type){
2650 if (v >= Byte.MinValue && v <= Byte.MaxValue)
2652 } else if (target_type == TypeManager.sbyte_type){
2653 if (v <= SByte.MaxValue)
2655 } else if (target_type == TypeManager.short_type){
2656 if (v <= Int16.MaxValue)
2658 } else if (target_type == TypeManager.ushort_type)
2660 else if (target_type == TypeManager.int64_type)
2662 else if (target_type == TypeManager.uint64_type)
2667 Error_ConstantValueCannotBeConverted (loc, s, target_type);
2672 // Load the object from the pointer.
2674 public static void LoadFromPtr (ILGenerator ig, Type t)
2676 if (t == TypeManager.int32_type)
2677 ig.Emit (OpCodes.Ldind_I4);
2678 else if (t == TypeManager.uint32_type)
2679 ig.Emit (OpCodes.Ldind_U4);
2680 else if (t == TypeManager.short_type)
2681 ig.Emit (OpCodes.Ldind_I2);
2682 else if (t == TypeManager.ushort_type)
2683 ig.Emit (OpCodes.Ldind_U2);
2684 else if (t == TypeManager.char_type)
2685 ig.Emit (OpCodes.Ldind_U2);
2686 else if (t == TypeManager.byte_type)
2687 ig.Emit (OpCodes.Ldind_U1);
2688 else if (t == TypeManager.sbyte_type)
2689 ig.Emit (OpCodes.Ldind_I1);
2690 else if (t == TypeManager.uint64_type)
2691 ig.Emit (OpCodes.Ldind_I8);
2692 else if (t == TypeManager.int64_type)
2693 ig.Emit (OpCodes.Ldind_I8);
2694 else if (t == TypeManager.float_type)
2695 ig.Emit (OpCodes.Ldind_R4);
2696 else if (t == TypeManager.double_type)
2697 ig.Emit (OpCodes.Ldind_R8);
2698 else if (t == TypeManager.bool_type)
2699 ig.Emit (OpCodes.Ldind_I1);
2700 else if (t == TypeManager.intptr_type)
2701 ig.Emit (OpCodes.Ldind_I);
2702 else if (TypeManager.IsEnumType (t)) {
2703 if (t == TypeManager.enum_type)
2704 ig.Emit (OpCodes.Ldind_Ref);
2706 LoadFromPtr (ig, TypeManager.EnumToUnderlying (t));
2707 } else if (t.IsValueType)
2708 ig.Emit (OpCodes.Ldobj, t);
2710 ig.Emit (OpCodes.Ldind_Ref);
2714 // The stack contains the pointer and the value of type `type'
2716 public static void StoreFromPtr (ILGenerator ig, Type type)
2718 if (TypeManager.IsEnumType (type))
2719 type = TypeManager.EnumToUnderlying (type);
2720 if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
2721 ig.Emit (OpCodes.Stind_I4);
2722 else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
2723 ig.Emit (OpCodes.Stind_I8);
2724 else if (type == TypeManager.char_type || type == TypeManager.short_type ||
2725 type == TypeManager.ushort_type)
2726 ig.Emit (OpCodes.Stind_I2);
2727 else if (type == TypeManager.float_type)
2728 ig.Emit (OpCodes.Stind_R4);
2729 else if (type == TypeManager.double_type)
2730 ig.Emit (OpCodes.Stind_R8);
2731 else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
2732 type == TypeManager.bool_type)
2733 ig.Emit (OpCodes.Stind_I1);
2734 else if (type == TypeManager.intptr_type)
2735 ig.Emit (OpCodes.Stind_I);
2736 else if (type.IsValueType)
2737 ig.Emit (OpCodes.Stobj, type);
2739 ig.Emit (OpCodes.Stind_Ref);
2743 // Returns the size of type `t' if known, otherwise, 0
2745 public static int GetTypeSize (Type t)
2747 t = TypeManager.TypeToCoreType (t);
2748 if (t == TypeManager.int32_type ||
2749 t == TypeManager.uint32_type ||
2750 t == TypeManager.float_type)
2752 else if (t == TypeManager.int64_type ||
2753 t == TypeManager.uint64_type ||
2754 t == TypeManager.double_type)
2756 else if (t == TypeManager.byte_type ||
2757 t == TypeManager.sbyte_type ||
2758 t == TypeManager.bool_type)
2760 else if (t == TypeManager.short_type ||
2761 t == TypeManager.char_type ||
2762 t == TypeManager.ushort_type)
2764 else if (t == TypeManager.decimal_type)
2771 // Default implementation of IAssignMethod.CacheTemporaries
2773 public void CacheTemporaries (EmitContext ec)
2777 static void Error_NegativeArrayIndex (Location loc)
2779 Report.Error (284, loc, "Can not create array with a negative size");
2783 // Converts `source' to an int, uint, long or ulong.
2785 public Expression ExpressionToArrayArgument (EmitContext ec, Expression source, Location loc)
2789 bool old_checked = ec.CheckState;
2790 ec.CheckState = true;
2792 target = ConvertImplicit (ec, source, TypeManager.int32_type, loc);
2793 if (target == null){
2794 target = ConvertImplicit (ec, source, TypeManager.uint32_type, loc);
2795 if (target == null){
2796 target = ConvertImplicit (ec, source, TypeManager.int64_type, loc);
2797 if (target == null){
2798 target = ConvertImplicit (ec, source, TypeManager.uint64_type, loc);
2800 Expression.Error_CannotConvertImplicit (loc, source.Type, TypeManager.int32_type);
2804 ec.CheckState = old_checked;
2807 // Only positive constants are allowed at compile time
2809 if (target is Constant){
2810 if (target is IntConstant){
2811 if (((IntConstant) target).Value < 0){
2812 Error_NegativeArrayIndex (loc);
2817 if (target is LongConstant){
2818 if (((LongConstant) target).Value < 0){
2819 Error_NegativeArrayIndex (loc);
2832 /// This is just a base class for expressions that can
2833 /// appear on statements (invocations, object creation,
2834 /// assignments, post/pre increment and decrement). The idea
2835 /// being that they would support an extra Emition interface that
2836 /// does not leave a result on the stack.
2838 public abstract class ExpressionStatement : Expression {
2841 /// Requests the expression to be emitted in a `statement'
2842 /// context. This means that no new value is left on the
2843 /// stack after invoking this method (constrasted with
2844 /// Emit that will always leave a value on the stack).
2846 public abstract void EmitStatement (EmitContext ec);
2850 /// This kind of cast is used to encapsulate the child
2851 /// whose type is child.Type into an expression that is
2852 /// reported to return "return_type". This is used to encapsulate
2853 /// expressions which have compatible types, but need to be dealt
2854 /// at higher levels with.
2856 /// For example, a "byte" expression could be encapsulated in one
2857 /// of these as an "unsigned int". The type for the expression
2858 /// would be "unsigned int".
2861 public class EmptyCast : Expression {
2862 protected Expression child;
2864 public EmptyCast (Expression child, Type return_type)
2866 eclass = child.eclass;
2871 public override Expression DoResolve (EmitContext ec)
2873 // This should never be invoked, we are born in fully
2874 // initialized state.
2879 public override void Emit (EmitContext ec)
2886 /// This class is used to wrap literals which belong inside Enums
2888 public class EnumConstant : Constant {
2889 public Constant Child;
2891 public EnumConstant (Constant child, Type enum_type)
2893 eclass = child.eclass;
2898 public override Expression DoResolve (EmitContext ec)
2900 // This should never be invoked, we are born in fully
2901 // initialized state.
2906 public override void Emit (EmitContext ec)
2911 public override object GetValue ()
2913 return Child.GetValue ();
2917 // Converts from one of the valid underlying types for an enumeration
2918 // (int32, uint32, int64, uint64, short, ushort, byte, sbyte) to
2919 // one of the internal compiler literals: Int/UInt/Long/ULong Literals.
2921 public Constant WidenToCompilerConstant ()
2923 Type t = TypeManager.EnumToUnderlying (Child.Type);
2924 object v = ((Constant) Child).GetValue ();;
2926 if (t == TypeManager.int32_type)
2927 return new IntConstant ((int) v);
2928 if (t == TypeManager.uint32_type)
2929 return new UIntConstant ((uint) v);
2930 if (t == TypeManager.int64_type)
2931 return new LongConstant ((long) v);
2932 if (t == TypeManager.uint64_type)
2933 return new ULongConstant ((ulong) v);
2934 if (t == TypeManager.short_type)
2935 return new ShortConstant ((short) v);
2936 if (t == TypeManager.ushort_type)
2937 return new UShortConstant ((ushort) v);
2938 if (t == TypeManager.byte_type)
2939 return new ByteConstant ((byte) v);
2940 if (t == TypeManager.sbyte_type)
2941 return new SByteConstant ((sbyte) v);
2943 throw new Exception ("Invalid enumeration underlying type: " + t);
2947 // Extracts the value in the enumeration on its native representation
2949 public object GetPlainValue ()
2951 Type t = TypeManager.EnumToUnderlying (Child.Type);
2952 object v = ((Constant) Child).GetValue ();;
2954 if (t == TypeManager.int32_type)
2956 if (t == TypeManager.uint32_type)
2958 if (t == TypeManager.int64_type)
2960 if (t == TypeManager.uint64_type)
2962 if (t == TypeManager.short_type)
2964 if (t == TypeManager.ushort_type)
2966 if (t == TypeManager.byte_type)
2968 if (t == TypeManager.sbyte_type)
2974 public override string AsString ()
2976 return Child.AsString ();
2979 public override DoubleConstant ConvertToDouble ()
2981 return Child.ConvertToDouble ();
2984 public override FloatConstant ConvertToFloat ()
2986 return Child.ConvertToFloat ();
2989 public override ULongConstant ConvertToULong ()
2991 return Child.ConvertToULong ();
2994 public override LongConstant ConvertToLong ()
2996 return Child.ConvertToLong ();
2999 public override UIntConstant ConvertToUInt ()
3001 return Child.ConvertToUInt ();
3004 public override IntConstant ConvertToInt ()
3006 return Child.ConvertToInt ();
3011 /// This kind of cast is used to encapsulate Value Types in objects.
3013 /// The effect of it is to box the value type emitted by the previous
3016 public class BoxedCast : EmptyCast {
3018 public BoxedCast (Expression expr)
3019 : base (expr, TypeManager.object_type)
3023 public override Expression DoResolve (EmitContext ec)
3025 // This should never be invoked, we are born in fully
3026 // initialized state.
3031 public override void Emit (EmitContext ec)
3035 ec.ig.Emit (OpCodes.Box, child.Type);
3039 public class UnboxCast : EmptyCast {
3040 public UnboxCast (Expression expr, Type return_type)
3041 : base (expr, return_type)
3045 public override Expression DoResolve (EmitContext ec)
3047 // This should never be invoked, we are born in fully
3048 // initialized state.
3053 public override void Emit (EmitContext ec)
3056 ILGenerator ig = ec.ig;
3059 ig.Emit (OpCodes.Unbox, t);
3061 LoadFromPtr (ig, t);
3066 /// This is used to perform explicit numeric conversions.
3068 /// Explicit numeric conversions might trigger exceptions in a checked
3069 /// context, so they should generate the conv.ovf opcodes instead of
3072 public class ConvCast : EmptyCast {
3073 public enum Mode : byte {
3074 I1_U1, I1_U2, I1_U4, I1_U8, I1_CH,
3076 I2_I1, I2_U1, I2_U2, I2_U4, I2_U8, I2_CH,
3077 U2_I1, U2_U1, U2_I2, U2_CH,
3078 I4_I1, I4_U1, I4_I2, I4_U2, I4_U4, I4_U8, I4_CH,
3079 U4_I1, U4_U1, U4_I2, U4_U2, U4_I4, U4_CH,
3080 I8_I1, I8_U1, I8_I2, I8_U2, I8_I4, I8_U4, I8_U8, I8_CH,
3081 U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH,
3082 CH_I1, CH_U1, CH_I2,
3083 R4_I1, R4_U1, R4_I2, R4_U2, R4_I4, R4_U4, R4_I8, R4_U8, R4_CH,
3084 R8_I1, R8_U1, R8_I2, R8_U2, R8_I4, R8_U4, R8_I8, R8_U8, R8_CH, R8_R4
3090 public ConvCast (EmitContext ec, Expression child, Type return_type, Mode m)
3091 : base (child, return_type)
3093 checked_state = ec.CheckState;
3097 public override Expression DoResolve (EmitContext ec)
3099 // This should never be invoked, we are born in fully
3100 // initialized state.
3105 public override void Emit (EmitContext ec)
3107 ILGenerator ig = ec.ig;
3113 case Mode.I1_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3114 case Mode.I1_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3115 case Mode.I1_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3116 case Mode.I1_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3117 case Mode.I1_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3119 case Mode.U1_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3120 case Mode.U1_CH: /* nothing */ break;
3122 case Mode.I2_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3123 case Mode.I2_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3124 case Mode.I2_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3125 case Mode.I2_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3126 case Mode.I2_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3127 case Mode.I2_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3129 case Mode.U2_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3130 case Mode.U2_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
3131 case Mode.U2_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
3132 case Mode.U2_CH: /* nothing */ break;
3134 case Mode.I4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3135 case Mode.I4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3136 case Mode.I4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
3137 case Mode.I4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3138 case Mode.I4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3139 case Mode.I4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3140 case Mode.I4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3142 case Mode.U4_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3143 case Mode.U4_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
3144 case Mode.U4_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
3145 case Mode.U4_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
3146 case Mode.U4_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
3147 case Mode.U4_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
3149 case Mode.I8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3150 case Mode.I8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3151 case Mode.I8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
3152 case Mode.I8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3153 case Mode.I8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
3154 case Mode.I8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3155 case Mode.I8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3156 case Mode.I8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3158 case Mode.U8_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3159 case Mode.U8_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
3160 case Mode.U8_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
3161 case Mode.U8_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
3162 case Mode.U8_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
3163 case Mode.U8_U4: ig.Emit (OpCodes.Conv_Ovf_U4_Un); break;
3164 case Mode.U8_I8: ig.Emit (OpCodes.Conv_Ovf_I8_Un); break;
3165 case Mode.U8_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
3167 case Mode.CH_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
3168 case Mode.CH_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
3169 case Mode.CH_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
3171 case Mode.R4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3172 case Mode.R4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3173 case Mode.R4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
3174 case Mode.R4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3175 case Mode.R4_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
3176 case Mode.R4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3177 case Mode.R4_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
3178 case Mode.R4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3179 case Mode.R4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3181 case Mode.R8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
3182 case Mode.R8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
3183 case Mode.R8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
3184 case Mode.R8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3185 case Mode.R8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
3186 case Mode.R8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
3187 case Mode.R8_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
3188 case Mode.R8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
3189 case Mode.R8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
3190 case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
3194 case Mode.I1_U1: ig.Emit (OpCodes.Conv_U1); break;
3195 case Mode.I1_U2: ig.Emit (OpCodes.Conv_U2); break;
3196 case Mode.I1_U4: ig.Emit (OpCodes.Conv_U4); break;
3197 case Mode.I1_U8: ig.Emit (OpCodes.Conv_I8); break;
3198 case Mode.I1_CH: ig.Emit (OpCodes.Conv_U2); break;
3200 case Mode.U1_I1: ig.Emit (OpCodes.Conv_I1); break;
3201 case Mode.U1_CH: ig.Emit (OpCodes.Conv_U2); break;
3203 case Mode.I2_I1: ig.Emit (OpCodes.Conv_I1); break;
3204 case Mode.I2_U1: ig.Emit (OpCodes.Conv_U1); break;
3205 case Mode.I2_U2: ig.Emit (OpCodes.Conv_U2); break;
3206 case Mode.I2_U4: ig.Emit (OpCodes.Conv_U4); break;
3207 case Mode.I2_U8: ig.Emit (OpCodes.Conv_I8); break;
3208 case Mode.I2_CH: ig.Emit (OpCodes.Conv_U2); break;
3210 case Mode.U2_I1: ig.Emit (OpCodes.Conv_I1); break;
3211 case Mode.U2_U1: ig.Emit (OpCodes.Conv_U1); break;
3212 case Mode.U2_I2: ig.Emit (OpCodes.Conv_I2); break;
3213 case Mode.U2_CH: /* nothing */ break;
3215 case Mode.I4_I1: ig.Emit (OpCodes.Conv_I1); break;
3216 case Mode.I4_U1: ig.Emit (OpCodes.Conv_U1); break;
3217 case Mode.I4_I2: ig.Emit (OpCodes.Conv_I2); break;
3218 case Mode.I4_U4: /* nothing */ break;
3219 case Mode.I4_U2: ig.Emit (OpCodes.Conv_U2); break;
3220 case Mode.I4_U8: ig.Emit (OpCodes.Conv_I8); break;
3221 case Mode.I4_CH: ig.Emit (OpCodes.Conv_U2); break;
3223 case Mode.U4_I1: ig.Emit (OpCodes.Conv_I1); break;
3224 case Mode.U4_U1: ig.Emit (OpCodes.Conv_U1); break;
3225 case Mode.U4_I2: ig.Emit (OpCodes.Conv_I2); break;
3226 case Mode.U4_U2: ig.Emit (OpCodes.Conv_U2); break;
3227 case Mode.U4_I4: /* nothing */ break;
3228 case Mode.U4_CH: ig.Emit (OpCodes.Conv_U2); break;
3230 case Mode.I8_I1: ig.Emit (OpCodes.Conv_I1); break;
3231 case Mode.I8_U1: ig.Emit (OpCodes.Conv_U1); break;
3232 case Mode.I8_I2: ig.Emit (OpCodes.Conv_I2); break;
3233 case Mode.I8_U2: ig.Emit (OpCodes.Conv_U2); break;
3234 case Mode.I8_I4: ig.Emit (OpCodes.Conv_I4); break;
3235 case Mode.I8_U4: ig.Emit (OpCodes.Conv_U4); break;
3236 case Mode.I8_U8: /* nothing */ break;
3237 case Mode.I8_CH: ig.Emit (OpCodes.Conv_U2); break;
3239 case Mode.U8_I1: ig.Emit (OpCodes.Conv_I1); break;
3240 case Mode.U8_U1: ig.Emit (OpCodes.Conv_U1); break;
3241 case Mode.U8_I2: ig.Emit (OpCodes.Conv_I2); break;
3242 case Mode.U8_U2: ig.Emit (OpCodes.Conv_U2); break;
3243 case Mode.U8_I4: ig.Emit (OpCodes.Conv_I4); break;
3244 case Mode.U8_U4: ig.Emit (OpCodes.Conv_U4); break;
3245 case Mode.U8_I8: /* nothing */ break;
3246 case Mode.U8_CH: ig.Emit (OpCodes.Conv_U2); break;
3248 case Mode.CH_I1: ig.Emit (OpCodes.Conv_I1); break;
3249 case Mode.CH_U1: ig.Emit (OpCodes.Conv_U1); break;
3250 case Mode.CH_I2: ig.Emit (OpCodes.Conv_I2); break;
3252 case Mode.R4_I1: ig.Emit (OpCodes.Conv_I1); break;
3253 case Mode.R4_U1: ig.Emit (OpCodes.Conv_U1); break;
3254 case Mode.R4_I2: ig.Emit (OpCodes.Conv_I2); break;
3255 case Mode.R4_U2: ig.Emit (OpCodes.Conv_U2); break;
3256 case Mode.R4_I4: ig.Emit (OpCodes.Conv_I4); break;
3257 case Mode.R4_U4: ig.Emit (OpCodes.Conv_U4); break;
3258 case Mode.R4_I8: ig.Emit (OpCodes.Conv_I8); break;
3259 case Mode.R4_U8: ig.Emit (OpCodes.Conv_U8); break;
3260 case Mode.R4_CH: ig.Emit (OpCodes.Conv_U2); break;
3262 case Mode.R8_I1: ig.Emit (OpCodes.Conv_I1); break;
3263 case Mode.R8_U1: ig.Emit (OpCodes.Conv_U1); break;
3264 case Mode.R8_I2: ig.Emit (OpCodes.Conv_I2); break;
3265 case Mode.R8_U2: ig.Emit (OpCodes.Conv_U2); break;
3266 case Mode.R8_I4: ig.Emit (OpCodes.Conv_I4); break;
3267 case Mode.R8_U4: ig.Emit (OpCodes.Conv_U4); break;
3268 case Mode.R8_I8: ig.Emit (OpCodes.Conv_I8); break;
3269 case Mode.R8_U8: ig.Emit (OpCodes.Conv_U8); break;
3270 case Mode.R8_CH: ig.Emit (OpCodes.Conv_U2); break;
3271 case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
3277 public class OpcodeCast : EmptyCast {
3281 public OpcodeCast (Expression child, Type return_type, OpCode op)
3282 : base (child, return_type)
3286 second_valid = false;
3289 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
3290 : base (child, return_type)
3295 second_valid = true;
3298 public override Expression DoResolve (EmitContext ec)
3300 // This should never be invoked, we are born in fully
3301 // initialized state.
3306 public override void Emit (EmitContext ec)
3317 /// This kind of cast is used to encapsulate a child and cast it
3318 /// to the class requested
3320 public class ClassCast : EmptyCast {
3321 public ClassCast (Expression child, Type return_type)
3322 : base (child, return_type)
3327 public override Expression DoResolve (EmitContext ec)
3329 // This should never be invoked, we are born in fully
3330 // initialized state.
3335 public override void Emit (EmitContext ec)
3339 ec.ig.Emit (OpCodes.Castclass, type);
3345 /// SimpleName expressions are initially formed of a single
3346 /// word and it only happens at the beginning of the expression.
3350 /// The expression will try to be bound to a Field, a Method
3351 /// group or a Property. If those fail we pass the name to our
3352 /// caller and the SimpleName is compounded to perform a type
3353 /// lookup. The idea behind this process is that we want to avoid
3354 /// creating a namespace map from the assemblies, as that requires
3355 /// the GetExportedTypes function to be called and a hashtable to
3356 /// be constructed which reduces startup time. If later we find
3357 /// that this is slower, we should create a `NamespaceExpr' expression
3358 /// that fully participates in the resolution process.
3360 /// For example `System.Console.WriteLine' is decomposed into
3361 /// MemberAccess (MemberAccess (SimpleName ("System"), "Console"), "WriteLine")
3363 /// The first SimpleName wont produce a match on its own, so it will
3365 /// MemberAccess (SimpleName ("System.Console"), "WriteLine").
3367 /// System.Console will produce a TypeExpr match.
3369 /// The downside of this is that we might be hitting `LookupType' too many
3370 /// times with this scheme.
3372 public class SimpleName : Expression, ITypeExpression {
3373 public readonly string Name;
3375 public SimpleName (string name, Location l)
3381 public static void Error_ObjectRefRequired (EmitContext ec, Location l, string name)
3383 if (ec.IsFieldInitializer)
3386 "A field initializer cannot reference the non-static field, " +
3387 "method or property `"+name+"'");
3391 "An object reference is required " +
3392 "for the non-static field `"+name+"'");
3396 // Checks whether we are trying to access an instance
3397 // property, method or field from a static body.
3399 Expression MemberStaticCheck (EmitContext ec, Expression e)
3401 if (e is IMemberExpr){
3402 IMemberExpr member = (IMemberExpr) e;
3404 if (!member.IsStatic){
3405 Error_ObjectRefRequired (ec, loc, Name);
3413 public override Expression DoResolve (EmitContext ec)
3415 return SimpleNameResolve (ec, null, false);
3418 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
3420 return SimpleNameResolve (ec, right_side, false);
3424 public Expression DoResolveAllowStatic (EmitContext ec)
3426 return SimpleNameResolve (ec, null, true);
3429 public Expression DoResolveType (EmitContext ec)
3432 // Stage 3: Lookup symbol in the various namespaces.
3434 DeclSpace ds = ec.DeclSpace;
3438 if (ec.ResolvingTypeTree){
3439 int errors = Report.Errors;
3440 Type dt = ec.DeclSpace.FindType (loc, Name);
3441 if (Report.Errors != errors)
3445 return new TypeExpr (dt, loc);
3448 if ((t = RootContext.LookupType (ds, Name, true, loc)) != null)
3449 return new TypeExpr (t, loc);
3453 // Stage 2 part b: Lookup up if we are an alias to a type
3456 // Since we are cheating: we only do the Alias lookup for
3457 // namespaces if the name does not include any dots in it
3460 alias_value = ec.DeclSpace.LookupAlias (Name);
3462 if (Name.IndexOf ('.') == -1 && alias_value != null) {
3463 if ((t = RootContext.LookupType (ds, alias_value, true, loc)) != null)
3464 return new TypeExpr (t, loc);
3466 // we have alias value, but it isn't Type, so try if it's namespace
3467 return new SimpleName (alias_value, loc);
3470 // No match, maybe our parent can compose us
3471 // into something meaningful.
3476 /// 7.5.2: Simple Names.
3478 /// Local Variables and Parameters are handled at
3479 /// parse time, so they never occur as SimpleNames.
3481 /// The `allow_static' flag is used by MemberAccess only
3482 /// and it is used to inform us that it is ok for us to
3483 /// avoid the static check, because MemberAccess might end
3484 /// up resolving the Name as a Type name and the access as
3485 /// a static type access.
3487 /// ie: Type Type; .... { Type.GetType (""); }
3489 /// Type is both an instance variable and a Type; Type.GetType
3490 /// is the static method not an instance method of type.
3492 Expression SimpleNameResolve (EmitContext ec, Expression right_side, bool allow_static)
3494 Expression e = null;
3497 // Stage 1: Performed by the parser (binding to locals or parameters).
3499 Block current_block = ec.CurrentBlock;
3500 if (current_block != null && current_block.IsVariableDefined (Name)){
3501 LocalVariableReference var;
3503 var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
3505 if (right_side != null)
3506 return var.ResolveLValue (ec, right_side);
3508 return var.Resolve (ec);
3511 if (current_block != null){
3513 Parameter par = null;
3514 Parameters pars = current_block.Parameters;
3516 par = pars.GetParameterByName (Name, out idx);
3519 ParameterReference param;
3521 param = new ParameterReference (pars, idx, Name, loc);
3523 if (right_side != null)
3524 return param.ResolveLValue (ec, right_side);
3526 return param.Resolve (ec);
3531 // Stage 2: Lookup members
3535 // For enums, the TypeBuilder is not ec.DeclSpace.TypeBuilder
3536 // Hence we have two different cases
3539 DeclSpace lookup_ds = ec.DeclSpace;
3541 if (lookup_ds.TypeBuilder == null)
3544 e = MemberLookup (ec, lookup_ds.TypeBuilder, Name, loc);
3549 // Classes/structs keep looking, enums break
3551 if (lookup_ds is TypeContainer)
3552 lookup_ds = ((TypeContainer) lookup_ds).Parent;
3555 } while (lookup_ds != null);
3557 if (e == null && ec.ContainerType != null)
3558 e = MemberLookup (ec, ec.ContainerType, Name, loc);
3561 return DoResolveType (ec);
3566 if (e is IMemberExpr) {
3567 e = MemberAccess.ResolveMemberAccess (ec, e, null, loc, this);
3571 IMemberExpr me = e as IMemberExpr;
3575 // This fails if ResolveMemberAccess() was unable to decide whether
3576 // it's a field or a type of the same name.
3577 if (!me.IsStatic && (me.InstanceExpression == null))
3581 TypeManager.IsNestedChildOf (me.InstanceExpression.Type, me.DeclaringType)) {
3582 Error (38, "Cannot access nonstatic member `" + me.Name + "' of " +
3583 "outer type `" + me.DeclaringType + "' via nested type `" +
3584 me.InstanceExpression.Type + "'");
3588 if (right_side != null)
3589 e = e.DoResolveLValue (ec, right_side);
3591 e = e.DoResolve (ec);
3596 if (ec.IsStatic || ec.IsFieldInitializer){
3600 return MemberStaticCheck (ec, e);
3605 public override void Emit (EmitContext ec)
3608 // If this is ever reached, then we failed to
3609 // find the name as a namespace
3612 Error (103, "The name `" + Name +
3613 "' does not exist in the class `" +
3614 ec.DeclSpace.Name + "'");
3617 public override string ToString ()
3624 /// Fully resolved expression that evaluates to a type
3626 public class TypeExpr : Expression, ITypeExpression {
3627 public TypeExpr (Type t, Location l)
3630 eclass = ExprClass.Type;
3634 public virtual Expression DoResolveType (EmitContext ec)
3639 override public Expression DoResolve (EmitContext ec)
3644 override public void Emit (EmitContext ec)
3646 throw new Exception ("Should never be called");
3649 public override string ToString ()
3651 return Type.ToString ();
3656 /// Used to create types from a fully qualified name. These are just used
3657 /// by the parser to setup the core types. A TypeLookupExpression is always
3658 /// classified as a type.
3660 public class TypeLookupExpression : TypeExpr {
3663 public TypeLookupExpression (string name) : base (null, Location.Null)
3668 public override Expression DoResolveType (EmitContext ec)
3671 type = RootContext.LookupType (ec.DeclSpace, name, false, Location.Null);
3675 public override Expression DoResolve (EmitContext ec)
3677 return DoResolveType (ec);
3680 public override void Emit (EmitContext ec)
3682 throw new Exception ("Should never be called");
3685 public override string ToString ()
3692 /// MethodGroup Expression.
3694 /// This is a fully resolved expression that evaluates to a type
3696 public class MethodGroupExpr : Expression, IMemberExpr {
3697 public MethodBase [] Methods;
3698 Expression instance_expression = null;
3699 bool is_explicit_impl = false;
3701 public MethodGroupExpr (MemberInfo [] mi, Location l)
3703 Methods = new MethodBase [mi.Length];
3704 mi.CopyTo (Methods, 0);
3705 eclass = ExprClass.MethodGroup;
3706 type = TypeManager.object_type;
3710 public MethodGroupExpr (ArrayList list, Location l)
3712 Methods = new MethodBase [list.Count];
3715 list.CopyTo (Methods, 0);
3717 foreach (MemberInfo m in list){
3718 if (!(m is MethodBase)){
3719 Console.WriteLine ("Name " + m.Name);
3720 Console.WriteLine ("Found a: " + m.GetType ().FullName);
3726 eclass = ExprClass.MethodGroup;
3727 type = TypeManager.object_type;
3730 public Type DeclaringType {
3732 return Methods [0].DeclaringType;
3737 // `A method group may have associated an instance expression'
3739 public Expression InstanceExpression {
3741 return instance_expression;
3745 instance_expression = value;
3749 public bool IsExplicitImpl {
3751 return is_explicit_impl;
3755 is_explicit_impl = value;
3759 public string Name {
3761 return Methods [0].Name;
3765 public bool IsInstance {
3767 foreach (MethodBase mb in Methods)
3775 public bool IsStatic {
3777 foreach (MethodBase mb in Methods)
3785 override public Expression DoResolve (EmitContext ec)
3787 if (instance_expression != null) {
3788 instance_expression = instance_expression.DoResolve (ec);
3789 if (instance_expression == null)
3796 public void ReportUsageError ()
3798 Report.Error (654, loc, "Method `" + Methods [0].DeclaringType + "." +
3799 Methods [0].Name + "()' is referenced without parentheses");
3802 override public void Emit (EmitContext ec)
3804 ReportUsageError ();
3807 bool RemoveMethods (bool keep_static)
3809 ArrayList smethods = new ArrayList ();
3811 foreach (MethodBase mb in Methods){
3812 if (mb.IsStatic == keep_static)
3816 if (smethods.Count == 0)
3819 Methods = new MethodBase [smethods.Count];
3820 smethods.CopyTo (Methods, 0);
3826 /// Removes any instance methods from the MethodGroup, returns
3827 /// false if the resulting set is empty.
3829 public bool RemoveInstanceMethods ()
3831 return RemoveMethods (true);
3835 /// Removes any static methods from the MethodGroup, returns
3836 /// false if the resulting set is empty.
3838 public bool RemoveStaticMethods ()
3840 return RemoveMethods (false);
3845 /// Fully resolved expression that evaluates to a Field
3847 public class FieldExpr : Expression, IAssignMethod, IMemoryLocation, IMemberExpr {
3848 public readonly FieldInfo FieldInfo;
3849 Expression instance_expr;
3851 public FieldExpr (FieldInfo fi, Location l)
3854 eclass = ExprClass.Variable;
3855 type = fi.FieldType;
3859 public string Name {
3861 return FieldInfo.Name;
3865 public bool IsInstance {
3867 return !FieldInfo.IsStatic;
3871 public bool IsStatic {
3873 return FieldInfo.IsStatic;
3877 public Type DeclaringType {
3879 return FieldInfo.DeclaringType;
3883 public Expression InstanceExpression {
3885 return instance_expr;
3889 instance_expr = value;
3893 override public Expression DoResolve (EmitContext ec)
3895 if (!FieldInfo.IsStatic){
3896 if (instance_expr == null){
3897 throw new Exception ("non-static FieldExpr without instance var\n" +
3898 "You have to assign the Instance variable\n" +
3899 "Of the FieldExpr to set this\n");
3902 // Resolve the field's instance expression while flow analysis is turned
3903 // off: when accessing a field "a.b", we must check whether the field
3904 // "a.b" is initialized, not whether the whole struct "a" is initialized.
3905 instance_expr = instance_expr.Resolve (ec, ResolveFlags.VariableOrValue |
3906 ResolveFlags.DisableFlowAnalysis);
3907 if (instance_expr == null)
3911 // If the instance expression is a local variable or parameter.
3912 IVariable var = instance_expr as IVariable;
3913 if ((var != null) && !var.IsFieldAssigned (ec, FieldInfo.Name, loc))
3919 void Report_AssignToReadonly (bool is_instance)
3924 msg = "Readonly field can not be assigned outside " +
3925 "of constructor or variable initializer";
3927 msg = "A static readonly field can only be assigned in " +
3928 "a static constructor";
3930 Report.Error (is_instance ? 191 : 198, loc, msg);
3933 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
3935 IVariable var = instance_expr as IVariable;
3937 var.SetFieldAssigned (ec, FieldInfo.Name);
3939 Expression e = DoResolve (ec);
3944 if (!FieldInfo.IsInitOnly)
3948 // InitOnly fields can only be assigned in constructors
3951 if (ec.IsConstructor)
3954 Report_AssignToReadonly (true);
3959 override public void Emit (EmitContext ec)
3961 ILGenerator ig = ec.ig;
3962 bool is_volatile = false;
3964 if (FieldInfo is FieldBuilder){
3965 FieldBase f = TypeManager.GetField (FieldInfo);
3967 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
3970 f.status |= Field.Status.USED;
3973 if (FieldInfo.IsStatic){
3975 ig.Emit (OpCodes.Volatile);
3977 ig.Emit (OpCodes.Ldsfld, FieldInfo);
3979 if (instance_expr.Type.IsValueType){
3981 LocalTemporary tempo = null;
3983 if (!(instance_expr is IMemoryLocation)){
3984 tempo = new LocalTemporary (
3985 ec, instance_expr.Type);
3987 InstanceExpression.Emit (ec);
3991 ml = (IMemoryLocation) instance_expr;
3993 ml.AddressOf (ec, AddressOp.Load);
3995 instance_expr.Emit (ec);
3998 ig.Emit (OpCodes.Volatile);
4000 ig.Emit (OpCodes.Ldfld, FieldInfo);
4004 public void EmitAssign (EmitContext ec, Expression source)
4006 FieldAttributes fa = FieldInfo.Attributes;
4007 bool is_static = (fa & FieldAttributes.Static) != 0;
4008 bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
4009 ILGenerator ig = ec.ig;
4011 if (is_readonly && !ec.IsConstructor){
4012 Report_AssignToReadonly (!is_static);
4017 Expression instance = instance_expr;
4019 if (instance.Type.IsValueType){
4020 if (instance is IMemoryLocation){
4021 IMemoryLocation ml = (IMemoryLocation) instance;
4023 ml.AddressOf (ec, AddressOp.Store);
4025 throw new Exception ("The " + instance + " of type " +
4027 " represents a ValueType and does " +
4028 "not implement IMemoryLocation");
4034 if (FieldInfo is FieldBuilder){
4035 FieldBase f = TypeManager.GetField (FieldInfo);
4037 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
4038 ig.Emit (OpCodes.Volatile);
4042 ig.Emit (OpCodes.Stsfld, FieldInfo);
4044 ig.Emit (OpCodes.Stfld, FieldInfo);
4046 if (FieldInfo is FieldBuilder){
4047 FieldBase f = TypeManager.GetField (FieldInfo);
4049 f.status |= Field.Status.ASSIGNED;
4053 public void AddressOf (EmitContext ec, AddressOp mode)
4055 ILGenerator ig = ec.ig;
4057 if (FieldInfo is FieldBuilder){
4058 FieldBase f = TypeManager.GetField (FieldInfo);
4059 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
4060 ig.Emit (OpCodes.Volatile);
4063 if (FieldInfo is FieldBuilder){
4064 FieldBase f = TypeManager.GetField (FieldInfo);
4066 if ((mode & AddressOp.Store) != 0)
4067 f.status |= Field.Status.ASSIGNED;
4068 if ((mode & AddressOp.Load) != 0)
4069 f.status |= Field.Status.USED;
4073 // Handle initonly fields specially: make a copy and then
4074 // get the address of the copy.
4076 if (FieldInfo.IsInitOnly){
4077 if (ec.IsConstructor) {
4078 ig.Emit (OpCodes.Ldsflda, FieldInfo);
4083 local = ig.DeclareLocal (type);
4084 ig.Emit (OpCodes.Stloc, local);
4085 ig.Emit (OpCodes.Ldloca, local);
4090 if (FieldInfo.IsStatic)
4091 ig.Emit (OpCodes.Ldsflda, FieldInfo);
4093 if (instance_expr is IMemoryLocation)
4094 ((IMemoryLocation)instance_expr).AddressOf (ec, AddressOp.LoadStore);
4096 instance_expr.Emit (ec);
4097 ig.Emit (OpCodes.Ldflda, FieldInfo);
4103 /// Expression that evaluates to a Property. The Assign class
4104 /// might set the `Value' expression if we are in an assignment.
4106 /// This is not an LValue because we need to re-write the expression, we
4107 /// can not take data from the stack and store it.
4109 public class PropertyExpr : ExpressionStatement, IAssignMethod, IMemberExpr {
4110 public readonly PropertyInfo PropertyInfo;
4112 MethodInfo [] Accessors;
4115 Expression instance_expr;
4117 public PropertyExpr (PropertyInfo pi, Location l)
4120 eclass = ExprClass.PropertyAccess;
4123 Accessors = TypeManager.GetAccessors (pi);
4125 if (Accessors != null)
4126 foreach (MethodInfo mi in Accessors){
4132 Accessors = new MethodInfo [2];
4134 type = TypeManager.TypeToCoreType (pi.PropertyType);
4137 public string Name {
4139 return PropertyInfo.Name;
4143 public bool IsInstance {
4149 public bool IsStatic {
4155 public Type DeclaringType {
4157 return PropertyInfo.DeclaringType;
4162 // The instance expression associated with this expression
4164 public Expression InstanceExpression {
4166 instance_expr = value;
4170 return instance_expr;
4174 public bool VerifyAssignable ()
4176 if (!PropertyInfo.CanWrite){
4177 Report.Error (200, loc,
4178 "The property `" + PropertyInfo.Name +
4179 "' can not be assigned to, as it has not set accessor");
4186 override public Expression DoResolve (EmitContext ec)
4188 if (!PropertyInfo.CanRead){
4189 Report.Error (154, loc,
4190 "The property `" + PropertyInfo.Name +
4191 "' can not be used in " +
4192 "this context because it lacks a get accessor");
4196 if ((instance_expr == null) && ec.IsStatic && !is_static) {
4197 SimpleName.Error_ObjectRefRequired (ec, loc, PropertyInfo.Name);
4201 if (instance_expr != null) {
4202 instance_expr = instance_expr.DoResolve (ec);
4203 if (instance_expr == null)
4210 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
4212 if (!PropertyInfo.CanWrite){
4213 Report.Error (154, loc,
4214 "The property `" + PropertyInfo.Name +
4215 "' can not be used in " +
4216 "this context because it lacks a set accessor");
4220 if (instance_expr != null) {
4221 instance_expr = instance_expr.DoResolve (ec);
4222 if (instance_expr == null)
4229 override public void Emit (EmitContext ec)
4231 MethodInfo method = Accessors [0];
4234 // Special case: length of single dimension array is turned into ldlen
4236 if ((method == TypeManager.system_int_array_get_length) ||
4237 (method == TypeManager.int_array_get_length)){
4238 Type iet = instance_expr.Type;
4241 // System.Array.Length can be called, but the Type does not
4242 // support invoking GetArrayRank, so test for that case first
4244 if (iet != TypeManager.array_type && (iet.GetArrayRank () == 1)){
4245 instance_expr.Emit (ec);
4246 ec.ig.Emit (OpCodes.Ldlen);
4251 Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, method, null, loc);
4256 // Implements the IAssignMethod interface for assignments
4258 public void EmitAssign (EmitContext ec, Expression source)
4260 Argument arg = new Argument (source, Argument.AType.Expression);
4261 ArrayList args = new ArrayList ();
4264 Invocation.EmitCall (ec, false, IsStatic, instance_expr, Accessors [1], args, loc);
4267 override public void EmitStatement (EmitContext ec)
4270 ec.ig.Emit (OpCodes.Pop);
4275 /// Fully resolved expression that evaluates to an Event
4277 public class EventExpr : Expression, IMemberExpr {
4278 public readonly EventInfo EventInfo;
4279 public Expression instance_expr;
4282 MethodInfo add_accessor, remove_accessor;
4284 public EventExpr (EventInfo ei, Location loc)
4288 eclass = ExprClass.EventAccess;
4290 add_accessor = TypeManager.GetAddMethod (ei);
4291 remove_accessor = TypeManager.GetRemoveMethod (ei);
4293 if (add_accessor.IsStatic || remove_accessor.IsStatic)
4296 if (EventInfo is MyEventBuilder)
4297 type = ((MyEventBuilder) EventInfo).EventType;
4299 type = EventInfo.EventHandlerType;
4302 public string Name {
4304 return EventInfo.Name;
4308 public bool IsInstance {
4314 public bool IsStatic {
4320 public Type DeclaringType {
4322 return EventInfo.DeclaringType;
4326 public Expression InstanceExpression {
4328 return instance_expr;
4332 instance_expr = value;
4336 public override Expression DoResolve (EmitContext ec)
4338 if (instance_expr != null) {
4339 instance_expr = instance_expr.DoResolve (ec);
4340 if (instance_expr == null)
4347 public override void Emit (EmitContext ec)
4349 Report.Error (70, loc, "The event `" + Name + "' can only appear on the left hand side of += or -= (except on the defining type)");
4352 public void EmitAddOrRemove (EmitContext ec, Expression source)
4354 Expression handler = ((Binary) source).Right;
4356 Argument arg = new Argument (handler, Argument.AType.Expression);
4357 ArrayList args = new ArrayList ();
4361 if (((Binary) source).Oper == Binary.Operator.Addition)
4362 Invocation.EmitCall (
4363 ec, false, IsStatic, instance_expr, add_accessor, args, loc);
4365 Invocation.EmitCall (
4366 ec, false, IsStatic, instance_expr, remove_accessor, args, loc);