2 // ecore.cs: Core of the Expression representation for the intermediate tree.
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001, 2002, 2003 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 // Mask of all the expression class flags.
57 // Disable control flow analysis while resolving the expression.
58 // This is used when resolving the instance expression of a field expression.
59 DisableFlowAnalysis = 8,
61 // Set if this is resolving the first part of a MemberAccess.
66 // This is just as a hint to AddressOf of what will be done with the
69 public enum AddressOp {
76 /// This interface is implemented by variables
78 public interface IMemoryLocation {
80 /// The AddressOf method should generate code that loads
81 /// the address of the object and leaves it on the stack.
83 /// The `mode' argument is used to notify the expression
84 /// of whether this will be used to read from the address or
85 /// write to the address.
87 /// This is just a hint that can be used to provide good error
88 /// reporting, and should have no other side effects.
90 void AddressOf (EmitContext ec, AddressOp mode);
94 /// We are either a namespace or a type.
95 /// If we're a type, `IsType' is true and we may use `Type' to get
96 /// a TypeExpr representing that type.
98 public interface IAlias {
107 TypeExpr ResolveAsType (EmitContext ec);
111 /// This interface is implemented by variables
113 public interface IVariable {
114 VariableInfo VariableInfo {
118 bool VerifyFixed (bool is_expression);
122 /// This interface denotes an expression which evaluates to a member
123 /// of a struct or a class.
125 public interface IMemberExpr
128 /// The name of this member.
135 /// Whether this is an instance member.
142 /// Whether this is a static member.
149 /// The type which declares this member.
156 /// The instance expression associated with this member, if it's a
157 /// non-static member.
159 Expression InstanceExpression {
165 /// Base class for expressions
167 public abstract class Expression {
168 public ExprClass eclass;
170 protected Location loc;
182 public Location Location {
189 /// Utility wrapper routine for Error, just to beautify the code
191 public void Error (int error, string s)
193 if (!Location.IsNull (loc))
194 Report.Error (error, loc, s);
196 Report.Error (error, s);
200 /// Utility wrapper routine for Warning, just to beautify the code
202 public void Warning (int code, string format, params object[] args)
204 Report.Warning (code, loc, format, args);
207 // Not nice but we have broken hierarchy
208 public virtual void CheckMarshallByRefAccess (Type container) {}
211 /// Tests presence of ObsoleteAttribute and report proper error
213 protected void CheckObsoleteAttribute (Type type)
215 ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
216 if (obsolete_attr == null)
219 AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, loc);
222 public static bool IsAccessorAccessible (Type invocation_type, MethodInfo mi, out bool must_do_cs1540_check)
224 MethodAttributes ma = mi.Attributes & MethodAttributes.MemberAccessMask;
226 must_do_cs1540_check = false; // by default we do not check for this
229 // If only accessible to the current class or children
231 if (ma == MethodAttributes.Private) {
232 Type declaring_type = mi.DeclaringType;
234 if (invocation_type != declaring_type)
235 return TypeManager.IsNestedChildOf (invocation_type, declaring_type);
240 // FamAndAssem requires that we not only derivate, but we are on the
243 if (ma == MethodAttributes.FamANDAssem){
244 return (mi.DeclaringType.Assembly != invocation_type.Assembly);
247 // Assembly and FamORAssem succeed if we're in the same assembly.
248 if ((ma == MethodAttributes.Assembly) || (ma == MethodAttributes.FamORAssem)){
249 if (mi.DeclaringType.Assembly == invocation_type.Assembly)
253 // We already know that we aren't in the same assembly.
254 if (ma == MethodAttributes.Assembly)
257 // Family and FamANDAssem require that we derive.
258 if ((ma == MethodAttributes.Family) || (ma == MethodAttributes.FamANDAssem) || (ma == MethodAttributes.FamORAssem)){
259 if (!TypeManager.IsNestedFamilyAccessible (invocation_type, mi.DeclaringType))
262 if (!TypeManager.IsNestedChildOf (invocation_type, mi.DeclaringType))
263 must_do_cs1540_check = true;
272 /// Performs semantic analysis on the Expression
276 /// The Resolve method is invoked to perform the semantic analysis
279 /// The return value is an expression (it can be the
280 /// same expression in some cases) or a new
281 /// expression that better represents this node.
283 /// For example, optimizations of Unary (LiteralInt)
284 /// would return a new LiteralInt with a negated
287 /// If there is an error during semantic analysis,
288 /// then an error should be reported (using Report)
289 /// and a null value should be returned.
291 /// There are two side effects expected from calling
292 /// Resolve(): the the field variable "eclass" should
293 /// be set to any value of the enumeration
294 /// `ExprClass' and the type variable should be set
295 /// to a valid type (this is the type of the
298 public abstract Expression DoResolve (EmitContext ec);
300 public virtual Expression DoResolveLValue (EmitContext ec, Expression right_side)
306 // This is used if the expression should be resolved as a type or namespace name.
307 // the default implementation fails.
309 public virtual FullNamedExpression ResolveAsTypeStep (EmitContext ec)
315 // This is used to resolve the expression as a type, a null
316 // value will be returned if the expression is not a type
319 public virtual TypeExpr ResolveAsTypeTerminal (EmitContext ec)
321 int errors = Report.Errors;
323 FullNamedExpression fne = ResolveAsTypeStep (ec);
326 if (errors == Report.Errors)
327 Report.Error (246, Location, "Cannot find type '{0}'", ToString ());
331 if (fne.eclass != ExprClass.Type) {
332 if (errors == Report.Errors)
333 Report.Error (118, Location, "'{0}' denotes a '{1}', where a type was expected",
334 fne.FullName, fne.ExprClassName ());
338 TypeExpr te = fne as TypeExpr;
340 if (!te.CheckAccessLevel (ec.DeclSpace)) {
341 Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", te.Name);
349 /// Resolves an expression and performs semantic analysis on it.
353 /// Currently Resolve wraps DoResolve to perform sanity
354 /// checking and assertion checking on what we expect from Resolve.
356 public Expression Resolve (EmitContext ec, ResolveFlags flags)
358 if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type)
359 return ResolveAsTypeStep (ec);
361 bool old_do_flow_analysis = ec.DoFlowAnalysis;
362 if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
363 ec.DoFlowAnalysis = false;
366 bool intermediate = (flags & ResolveFlags.Intermediate) == ResolveFlags.Intermediate;
367 if (this is SimpleName)
368 e = ((SimpleName) this).DoResolveAllowStatic (ec, intermediate);
373 ec.DoFlowAnalysis = old_do_flow_analysis;
378 if ((e is TypeExpr) || (e is ComposedCast) || (e is Namespace)) {
379 if ((flags & ResolveFlags.Type) == 0) {
380 e.Error_UnexpectedKind (flags, loc);
389 case ExprClass.Namespace:
390 if ((flags & ResolveFlags.VariableOrValue) == 0) {
391 e.Error_UnexpectedKind (flags, loc);
396 case ExprClass.MethodGroup:
397 if (RootContext.Version == LanguageVersion.ISO_1){
398 if ((flags & ResolveFlags.MethodGroup) == 0) {
399 ((MethodGroupExpr) e).ReportUsageError ();
405 case ExprClass.Value:
406 case ExprClass.Variable:
407 case ExprClass.PropertyAccess:
408 case ExprClass.EventAccess:
409 case ExprClass.IndexerAccess:
410 if ((flags & ResolveFlags.VariableOrValue) == 0) {
411 Console.WriteLine ("I got: {0} and {1}", e.GetType (), e);
412 Console.WriteLine ("I am {0} and {1}", this.GetType (), this);
413 FieldInfo fi = ((FieldExpr) e).FieldInfo;
415 Console.WriteLine ("{0} and {1}", fi.DeclaringType, fi.Name);
416 e.Error_UnexpectedKind (flags, loc);
422 throw new Exception ("Expression " + e.GetType () +
423 " ExprClass is Invalid after resolve");
426 if (e.type == null && !(e is Namespace)) {
427 throw new Exception (
428 "Expression " + e.GetType () +
429 " did not set its type after Resolve\n" +
430 "called from: " + this.GetType ());
437 /// Resolves an expression and performs semantic analysis on it.
439 public Expression Resolve (EmitContext ec)
441 return Resolve (ec, ResolveFlags.VariableOrValue);
445 /// Resolves an expression for LValue assignment
449 /// Currently ResolveLValue wraps DoResolveLValue to perform sanity
450 /// checking and assertion checking on what we expect from Resolve
452 public Expression ResolveLValue (EmitContext ec, Expression right_side)
454 int errors = Report.Errors;
455 Expression e = DoResolveLValue (ec, right_side);
458 if (errors == Report.Errors)
459 Report.Error (131, Location, "The left-hand side of an assignment or mutating operation must be a variable, property or indexer");
464 if (e.eclass == ExprClass.Invalid)
465 throw new Exception ("Expression " + e +
466 " ExprClass is Invalid after resolve");
468 if (e.eclass == ExprClass.MethodGroup) {
469 ((MethodGroupExpr) e).ReportUsageError ();
473 if ((e.type == null) && !(e is ConstructedType))
474 throw new Exception ("Expression " + e +
475 " did not set its type after Resolve");
482 /// Emits the code for the expression
486 /// The Emit method is invoked to generate the code
487 /// for the expression.
489 public abstract void Emit (EmitContext ec);
491 public virtual void EmitBranchable (EmitContext ec, Label target, bool onTrue)
494 ec.ig.Emit (onTrue ? OpCodes.Brtrue : OpCodes.Brfalse, target);
498 /// Protected constructor. Only derivate types should
499 /// be able to be created
502 protected Expression ()
504 eclass = ExprClass.Invalid;
509 /// Returns a literalized version of a literal FieldInfo
513 /// The possible return values are:
514 /// IntConstant, UIntConstant
515 /// LongLiteral, ULongConstant
516 /// FloatConstant, DoubleConstant
519 /// The value returned is already resolved.
521 public static Constant Constantify (object v, Type t)
523 if (t == TypeManager.int32_type)
524 return new IntConstant ((int) v);
525 else if (t == TypeManager.uint32_type)
526 return new UIntConstant ((uint) v);
527 else if (t == TypeManager.int64_type)
528 return new LongConstant ((long) v);
529 else if (t == TypeManager.uint64_type)
530 return new ULongConstant ((ulong) v);
531 else if (t == TypeManager.float_type)
532 return new FloatConstant ((float) v);
533 else if (t == TypeManager.double_type)
534 return new DoubleConstant ((double) v);
535 else if (t == TypeManager.string_type)
536 return new StringConstant ((string) v);
537 else if (t == TypeManager.short_type)
538 return new ShortConstant ((short)v);
539 else if (t == TypeManager.ushort_type)
540 return new UShortConstant ((ushort)v);
541 else if (t == TypeManager.sbyte_type)
542 return new SByteConstant (((sbyte)v));
543 else if (t == TypeManager.byte_type)
544 return new ByteConstant ((byte)v);
545 else if (t == TypeManager.char_type)
546 return new CharConstant ((char)v);
547 else if (t == TypeManager.bool_type)
548 return new BoolConstant ((bool) v);
549 else if (t == TypeManager.decimal_type)
550 return new DecimalConstant ((decimal) v);
551 else if (TypeManager.IsEnumType (t)){
552 Type real_type = TypeManager.TypeToCoreType (v.GetType ());
554 real_type = System.Enum.GetUnderlyingType (real_type);
556 Constant e = Constantify (v, real_type);
558 return new EnumConstant (e, t);
559 } else if (v == null && !TypeManager.IsValueType (t))
560 return NullLiteral.Null;
562 throw new Exception ("Unknown type for constant (" + t +
567 /// Returns a fully formed expression after a MemberLookup
569 public static Expression ExprClassFromMemberInfo (EmitContext ec, MemberInfo mi, Location loc)
572 return new EventExpr ((EventInfo) mi, loc);
573 else if (mi is FieldInfo)
574 return new FieldExpr ((FieldInfo) mi, loc);
575 else if (mi is PropertyInfo)
576 return new PropertyExpr (ec, (PropertyInfo) mi, loc);
577 else if (mi is Type){
578 return new TypeExpression ((System.Type) mi, loc);
584 protected static ArrayList almostMatchedMembers = new ArrayList (4);
587 // FIXME: Probably implement a cache for (t,name,current_access_set)?
589 // This code could use some optimizations, but we need to do some
590 // measurements. For example, we could use a delegate to `flag' when
591 // something can not any longer be a method-group (because it is something
595 // If the return value is an Array, then it is an array of
598 // If the return value is an MemberInfo, it is anything, but a Method
602 // FIXME: When calling MemberLookup inside an `Invocation', we should pass
603 // the arguments here and have MemberLookup return only the methods that
604 // match the argument count/type, unlike we are doing now (we delay this
607 // This is so we can catch correctly attempts to invoke instance methods
608 // from a static body (scan for error 120 in ResolveSimpleName).
611 // FIXME: Potential optimization, have a static ArrayList
614 public static Expression MemberLookup (EmitContext ec, Type queried_type, string name,
615 MemberTypes mt, BindingFlags bf, Location loc)
617 return MemberLookup (ec, ec.ContainerType, null, queried_type, name, mt, bf, loc);
621 // Lookup type `queried_type' for code in class `container_type' with a qualifier of
622 // `qualifier_type' or null to lookup members in the current class.
625 public static Expression MemberLookup (EmitContext ec, Type container_type,
626 Type qualifier_type, Type queried_type,
627 string name, MemberTypes mt,
628 BindingFlags bf, Location loc)
630 almostMatchedMembers.Clear ();
632 MemberInfo [] mi = TypeManager.MemberLookup (
633 container_type, qualifier_type,queried_type, mt, bf, name,
634 almostMatchedMembers);
639 int count = mi.Length;
641 if (mi [0] is MethodBase)
642 return new MethodGroupExpr (mi, loc);
647 return ExprClassFromMemberInfo (ec, mi [0], loc);
650 public const MemberTypes AllMemberTypes =
651 MemberTypes.Constructor |
655 MemberTypes.NestedType |
656 MemberTypes.Property;
658 public const BindingFlags AllBindingFlags =
659 BindingFlags.Public |
660 BindingFlags.Static |
661 BindingFlags.Instance;
663 public static Expression MemberLookup (EmitContext ec, Type queried_type,
664 string name, Location loc)
666 return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
667 AllMemberTypes, AllBindingFlags, loc);
670 public static Expression MemberLookup (EmitContext ec, Type qualifier_type,
671 Type queried_type, string name, Location loc)
673 return MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type,
674 name, AllMemberTypes, AllBindingFlags, loc);
677 public static Expression MethodLookup (EmitContext ec, Type queried_type,
678 string name, Location loc)
680 return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
681 MemberTypes.Method, AllBindingFlags, loc);
685 /// This is a wrapper for MemberLookup that is not used to "probe", but
686 /// to find a final definition. If the final definition is not found, we
687 /// look for private members and display a useful debugging message if we
690 public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
691 Type queried_type, string name,
694 return MemberLookupFinal (ec, qualifier_type, queried_type, name,
695 AllMemberTypes, AllBindingFlags, loc);
698 public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
699 Type queried_type, string name,
700 MemberTypes mt, BindingFlags bf,
705 int errors = Report.Errors;
707 e = MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type,
710 if (e == null && errors == Report.Errors)
711 // No errors were reported by MemberLookup, but there was an error.
712 MemberLookupFailed (ec, qualifier_type, queried_type, name, null, true, loc);
717 public static void MemberLookupFailed (EmitContext ec, Type qualifier_type,
718 Type queried_type, string name,
719 string class_name, bool complain_if_none_found,
722 if (almostMatchedMembers.Count != 0) {
723 if (qualifier_type == null) {
724 foreach (MemberInfo m in almostMatchedMembers)
725 Report.Error (38, loc,
726 "Cannot access non-static member `{0}' via nested type `{1}'",
727 TypeManager.GetFullNameSignature (m),
728 TypeManager.CSharpName (ec.ContainerType));
733 if (qualifier_type != ec.ContainerType) {
734 // Although a derived class can access protected members of
735 // its base class it cannot do so through an instance of the
736 // base class (CS1540). If the qualifier_type is a base of the
737 // ec.ContainerType and the lookup succeeds with the latter one,
738 // then we are in this situation.
739 for (int i = 0; i < almostMatchedMembers.Count; ++i) {
740 MemberInfo m = (MemberInfo) almostMatchedMembers [i];
741 for (int j = 0; j < i; ++j) {
742 if (m == almostMatchedMembers [j]) {
750 Report.SymbolRelatedToPreviousError (m);
751 Report.Error (1540, loc,
752 "Cannot access protected member `{0}' via a qualifier of type `{1}';"
753 + " the qualifier must be of type `{2}' (or derived from it)",
754 TypeManager.GetFullNameSignature (m),
755 TypeManager.CSharpName (qualifier_type),
756 TypeManager.CSharpName (ec.ContainerType));
760 almostMatchedMembers.Clear ();
763 MemberInfo[] mi = TypeManager.MemberLookup (queried_type, null, queried_type,
764 AllMemberTypes, AllBindingFlags |
765 BindingFlags.NonPublic, name, null);
768 if (!complain_if_none_found)
771 if (class_name != null)
772 Report.Error (103, loc, "The name `" + name + "' could not be " +
773 "found in `" + class_name + "'");
776 117, loc, "`" + queried_type + "' does not contain a " +
777 "definition for `" + name + "'");
781 if (TypeManager.MemberLookup (queried_type, null, queried_type,
782 AllMemberTypes, AllBindingFlags |
783 BindingFlags.NonPublic, name, null) == null) {
784 if ((mi.Length == 1) && (mi [0] is Type)) {
785 Type t = (Type) mi [0];
787 Report.Error (305, loc,
788 "Using the generic type `{0}' " +
789 "requires {1} type arguments",
790 TypeManager.GetFullName (t),
791 TypeManager.GetNumberOfTypeArguments (t));
796 if (name == ".ctor" && TypeManager.FindMembers (qualifier_type, MemberTypes.Constructor,
797 BindingFlags.Static | BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly, null, null).Count == 0)
799 Report.Error (143, loc, String.Format ("The type '{0}' has no constructors defined", TypeManager.CSharpName (queried_type)));
803 if (qualifier_type != null) {
804 Report.Error (122, loc, "'{0}' is inaccessible due to its protection level", TypeManager.CSharpName (qualifier_type) + "." + name);
806 Report.Error (122, loc, "'{0}' is inaccessible due to its protection level", name);
810 static public MemberInfo GetFieldFromEvent (EventExpr event_expr)
812 EventInfo ei = event_expr.EventInfo;
814 return TypeManager.GetPrivateFieldOfEvent (ei);
818 /// Returns an expression that can be used to invoke operator true
819 /// on the expression if it exists.
821 static public Expression GetOperatorTrue (EmitContext ec, Expression e, Location loc)
823 return GetOperatorTrueOrFalse (ec, e, true, loc);
827 /// Returns an expression that can be used to invoke operator false
828 /// on the expression if it exists.
830 static public Expression GetOperatorFalse (EmitContext ec, Expression e, Location loc)
832 return GetOperatorTrueOrFalse (ec, e, false, loc);
835 static Expression GetOperatorTrueOrFalse (EmitContext ec, Expression e, bool is_true, Location loc)
838 Expression operator_group;
840 if (TypeManager.IsNullableType (e.Type))
841 return new Nullable.OperatorTrueOrFalse (e, is_true, loc).Resolve (ec);
843 operator_group = MethodLookup (ec, e.Type, is_true ? "op_True" : "op_False", loc);
844 if (operator_group == null)
847 ArrayList arguments = new ArrayList ();
848 arguments.Add (new Argument (e, Argument.AType.Expression));
849 method = Invocation.OverloadResolve (
850 ec, (MethodGroupExpr) operator_group, arguments, false, loc);
855 return new StaticCallExpr ((MethodInfo) method, arguments, loc);
859 /// Resolves the expression `e' into a boolean expression: either through
860 /// an implicit conversion, or through an `operator true' invocation
862 public static Expression ResolveBoolean (EmitContext ec, Expression e, Location loc)
868 if (e.Type == TypeManager.bool_type)
871 Expression converted = Convert.ImplicitConversion (ec, e, TypeManager.bool_type, new Location (-1));
873 if (converted != null)
877 // If no implicit conversion to bool exists, try using `operator true'
879 Expression operator_true = Expression.GetOperatorTrue (ec, e, loc);
880 if (operator_true == null){
881 Report.Error (31, loc, "Can not convert the expression to a boolean");
884 return operator_true;
887 public string ExprClassName ()
890 case ExprClass.Invalid:
892 case ExprClass.Value:
894 case ExprClass.Variable:
896 case ExprClass.Namespace:
900 case ExprClass.MethodGroup:
901 return "method group";
902 case ExprClass.PropertyAccess:
903 return "property access";
904 case ExprClass.EventAccess:
905 return "event access";
906 case ExprClass.IndexerAccess:
907 return "indexer access";
908 case ExprClass.Nothing:
911 throw new Exception ("Should not happen");
915 /// Reports that we were expecting `expr' to be of class `expected'
917 public void Error_UnexpectedKind (string expected, Location loc)
919 Report.Error (118, loc, "Expression denotes a `" + ExprClassName () +
920 "' where a `" + expected + "' was expected");
923 public void Error_UnexpectedKind (ResolveFlags flags, Location loc)
925 ArrayList valid = new ArrayList (10);
927 if ((flags & ResolveFlags.VariableOrValue) != 0) {
928 valid.Add ("variable");
932 if ((flags & ResolveFlags.Type) != 0)
935 if ((flags & ResolveFlags.MethodGroup) != 0)
936 valid.Add ("method group");
938 if (valid.Count == 0)
939 valid.Add ("unknown");
941 StringBuilder sb = new StringBuilder ();
942 for (int i = 0; i < valid.Count; i++) {
945 else if (i == valid.Count)
947 sb.Append (valid [i]);
950 Report.Error (119, loc, "Expression denotes a `" + ExprClassName () + "' where " +
951 "a `" + sb.ToString () + "' was expected");
954 static public void Error_ConstantValueCannotBeConverted (Location l, string val, Type t)
956 Report.Error (31, l, "Constant value `" + val + "' cannot be converted to " +
957 TypeManager.CSharpName (t));
960 public static void UnsafeError (Location loc)
962 Report.Error (214, loc, "Pointers may only be used in an unsafe context");
966 /// Converts the IntConstant, UIntConstant, LongConstant or
967 /// ULongConstant into the integral target_type. Notice
968 /// that we do not return an `Expression' we do return
969 /// a boxed integral type.
971 /// FIXME: Since I added the new constants, we need to
972 /// also support conversions from CharConstant, ByteConstant,
973 /// SByteConstant, UShortConstant, ShortConstant
975 /// This is used by the switch statement, so the domain
976 /// of work is restricted to the literals above, and the
977 /// targets are int32, uint32, char, byte, sbyte, ushort,
978 /// short, uint64 and int64
980 public static object ConvertIntLiteral (Constant c, Type target_type, Location loc)
982 if (!Convert.ImplicitStandardConversionExists (Convert.ConstantEC, c, target_type)){
983 Convert.Error_CannotImplicitConversion (loc, c.Type, target_type);
989 if (c.Type == target_type)
990 return ((Constant) c).GetValue ();
993 // Make into one of the literals we handle, we dont really care
994 // about this value as we will just return a few limited types
996 if (c is EnumConstant)
997 c = ((EnumConstant)c).WidenToCompilerConstant ();
999 if (c is IntConstant){
1000 int v = ((IntConstant) c).Value;
1002 if (target_type == TypeManager.uint32_type){
1005 } else if (target_type == TypeManager.char_type){
1006 if (v >= Char.MinValue && v <= Char.MaxValue)
1008 } else if (target_type == TypeManager.byte_type){
1009 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1011 } else if (target_type == TypeManager.sbyte_type){
1012 if (v >= SByte.MinValue && v <= SByte.MaxValue)
1014 } else if (target_type == TypeManager.short_type){
1015 if (v >= Int16.MinValue && v <= UInt16.MaxValue)
1017 } else if (target_type == TypeManager.ushort_type){
1018 if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
1020 } else if (target_type == TypeManager.int64_type)
1022 else if (target_type == TypeManager.uint64_type){
1028 } else if (c is UIntConstant){
1029 uint v = ((UIntConstant) c).Value;
1031 if (target_type == TypeManager.int32_type){
1032 if (v <= Int32.MaxValue)
1034 } else if (target_type == TypeManager.char_type){
1035 if (v >= Char.MinValue && v <= Char.MaxValue)
1037 } else if (target_type == TypeManager.byte_type){
1038 if (v <= Byte.MaxValue)
1040 } else if (target_type == TypeManager.sbyte_type){
1041 if (v <= SByte.MaxValue)
1043 } else if (target_type == TypeManager.short_type){
1044 if (v <= UInt16.MaxValue)
1046 } else if (target_type == TypeManager.ushort_type){
1047 if (v <= UInt16.MaxValue)
1049 } else if (target_type == TypeManager.int64_type)
1051 else if (target_type == TypeManager.uint64_type)
1054 } else if (c is LongConstant){
1055 long v = ((LongConstant) c).Value;
1057 if (target_type == TypeManager.int32_type){
1058 if (v >= UInt32.MinValue && v <= UInt32.MaxValue)
1060 } else if (target_type == TypeManager.uint32_type){
1061 if (v >= 0 && v <= UInt32.MaxValue)
1063 } else if (target_type == TypeManager.char_type){
1064 if (v >= Char.MinValue && v <= Char.MaxValue)
1066 } else if (target_type == TypeManager.byte_type){
1067 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1069 } else if (target_type == TypeManager.sbyte_type){
1070 if (v >= SByte.MinValue && v <= SByte.MaxValue)
1072 } else if (target_type == TypeManager.short_type){
1073 if (v >= Int16.MinValue && v <= UInt16.MaxValue)
1075 } else if (target_type == TypeManager.ushort_type){
1076 if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
1078 } else if (target_type == TypeManager.uint64_type){
1083 } else if (c is ULongConstant){
1084 ulong v = ((ULongConstant) c).Value;
1086 if (target_type == TypeManager.int32_type){
1087 if (v <= Int32.MaxValue)
1089 } else if (target_type == TypeManager.uint32_type){
1090 if (v <= UInt32.MaxValue)
1092 } else if (target_type == TypeManager.char_type){
1093 if (v >= Char.MinValue && v <= Char.MaxValue)
1095 } else if (target_type == TypeManager.byte_type){
1096 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1098 } else if (target_type == TypeManager.sbyte_type){
1099 if (v <= (int) SByte.MaxValue)
1101 } else if (target_type == TypeManager.short_type){
1102 if (v <= UInt16.MaxValue)
1104 } else if (target_type == TypeManager.ushort_type){
1105 if (v <= UInt16.MaxValue)
1107 } else if (target_type == TypeManager.int64_type){
1108 if (v <= Int64.MaxValue)
1112 } else if (c is ByteConstant){
1113 byte v = ((ByteConstant) c).Value;
1115 if (target_type == TypeManager.int32_type)
1117 else if (target_type == TypeManager.uint32_type)
1119 else if (target_type == TypeManager.char_type)
1121 else if (target_type == TypeManager.sbyte_type){
1122 if (v <= SByte.MaxValue)
1124 } else if (target_type == TypeManager.short_type)
1126 else if (target_type == TypeManager.ushort_type)
1128 else if (target_type == TypeManager.int64_type)
1130 else if (target_type == TypeManager.uint64_type)
1133 } else if (c is SByteConstant){
1134 sbyte v = ((SByteConstant) c).Value;
1136 if (target_type == TypeManager.int32_type)
1138 else if (target_type == TypeManager.uint32_type){
1141 } else if (target_type == TypeManager.char_type){
1144 } else if (target_type == TypeManager.byte_type){
1147 } else if (target_type == TypeManager.short_type)
1149 else if (target_type == TypeManager.ushort_type){
1152 } else if (target_type == TypeManager.int64_type)
1154 else if (target_type == TypeManager.uint64_type){
1159 } else if (c is ShortConstant){
1160 short v = ((ShortConstant) c).Value;
1162 if (target_type == TypeManager.int32_type){
1164 } else if (target_type == TypeManager.uint32_type){
1167 } else if (target_type == TypeManager.char_type){
1170 } else if (target_type == TypeManager.byte_type){
1171 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1173 } else if (target_type == TypeManager.sbyte_type){
1174 if (v >= SByte.MinValue && v <= SByte.MaxValue)
1176 } else if (target_type == TypeManager.ushort_type){
1179 } else if (target_type == TypeManager.int64_type)
1181 else if (target_type == TypeManager.uint64_type)
1185 } else if (c is UShortConstant){
1186 ushort v = ((UShortConstant) c).Value;
1188 if (target_type == TypeManager.int32_type)
1190 else if (target_type == TypeManager.uint32_type)
1192 else if (target_type == TypeManager.char_type){
1193 if (v >= Char.MinValue && v <= Char.MaxValue)
1195 } else if (target_type == TypeManager.byte_type){
1196 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1198 } else if (target_type == TypeManager.sbyte_type){
1199 if (v <= SByte.MaxValue)
1201 } else if (target_type == TypeManager.short_type){
1202 if (v <= Int16.MaxValue)
1204 } else if (target_type == TypeManager.int64_type)
1206 else if (target_type == TypeManager.uint64_type)
1210 } else if (c is CharConstant){
1211 char v = ((CharConstant) c).Value;
1213 if (target_type == TypeManager.int32_type)
1215 else if (target_type == TypeManager.uint32_type)
1217 else if (target_type == TypeManager.byte_type){
1218 if (v >= Byte.MinValue && v <= Byte.MaxValue)
1220 } else if (target_type == TypeManager.sbyte_type){
1221 if (v <= SByte.MaxValue)
1223 } else if (target_type == TypeManager.short_type){
1224 if (v <= Int16.MaxValue)
1226 } else if (target_type == TypeManager.ushort_type)
1228 else if (target_type == TypeManager.int64_type)
1230 else if (target_type == TypeManager.uint64_type)
1235 Error_ConstantValueCannotBeConverted (loc, s, target_type);
1240 // Load the object from the pointer.
1242 public static void LoadFromPtr (ILGenerator ig, Type t)
1244 if (t == TypeManager.int32_type)
1245 ig.Emit (OpCodes.Ldind_I4);
1246 else if (t == TypeManager.uint32_type)
1247 ig.Emit (OpCodes.Ldind_U4);
1248 else if (t == TypeManager.short_type)
1249 ig.Emit (OpCodes.Ldind_I2);
1250 else if (t == TypeManager.ushort_type)
1251 ig.Emit (OpCodes.Ldind_U2);
1252 else if (t == TypeManager.char_type)
1253 ig.Emit (OpCodes.Ldind_U2);
1254 else if (t == TypeManager.byte_type)
1255 ig.Emit (OpCodes.Ldind_U1);
1256 else if (t == TypeManager.sbyte_type)
1257 ig.Emit (OpCodes.Ldind_I1);
1258 else if (t == TypeManager.uint64_type)
1259 ig.Emit (OpCodes.Ldind_I8);
1260 else if (t == TypeManager.int64_type)
1261 ig.Emit (OpCodes.Ldind_I8);
1262 else if (t == TypeManager.float_type)
1263 ig.Emit (OpCodes.Ldind_R4);
1264 else if (t == TypeManager.double_type)
1265 ig.Emit (OpCodes.Ldind_R8);
1266 else if (t == TypeManager.bool_type)
1267 ig.Emit (OpCodes.Ldind_I1);
1268 else if (t == TypeManager.intptr_type)
1269 ig.Emit (OpCodes.Ldind_I);
1270 else if (TypeManager.IsEnumType (t)) {
1271 if (t == TypeManager.enum_type)
1272 ig.Emit (OpCodes.Ldind_Ref);
1274 LoadFromPtr (ig, TypeManager.EnumToUnderlying (t));
1275 } else if (t.IsValueType || t.IsGenericParameter)
1276 ig.Emit (OpCodes.Ldobj, t);
1277 else if (t.IsPointer)
1278 ig.Emit (OpCodes.Ldind_I);
1280 ig.Emit (OpCodes.Ldind_Ref);
1284 // The stack contains the pointer and the value of type `type'
1286 public static void StoreFromPtr (ILGenerator ig, Type type)
1288 if (TypeManager.IsEnumType (type))
1289 type = TypeManager.EnumToUnderlying (type);
1290 if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
1291 ig.Emit (OpCodes.Stind_I4);
1292 else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
1293 ig.Emit (OpCodes.Stind_I8);
1294 else if (type == TypeManager.char_type || type == TypeManager.short_type ||
1295 type == TypeManager.ushort_type)
1296 ig.Emit (OpCodes.Stind_I2);
1297 else if (type == TypeManager.float_type)
1298 ig.Emit (OpCodes.Stind_R4);
1299 else if (type == TypeManager.double_type)
1300 ig.Emit (OpCodes.Stind_R8);
1301 else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
1302 type == TypeManager.bool_type)
1303 ig.Emit (OpCodes.Stind_I1);
1304 else if (type == TypeManager.intptr_type)
1305 ig.Emit (OpCodes.Stind_I);
1306 else if (type.IsValueType || type.IsGenericParameter)
1307 ig.Emit (OpCodes.Stobj, type);
1309 ig.Emit (OpCodes.Stind_Ref);
1313 // Returns the size of type `t' if known, otherwise, 0
1315 public static int GetTypeSize (Type t)
1317 t = TypeManager.TypeToCoreType (t);
1318 if (t == TypeManager.int32_type ||
1319 t == TypeManager.uint32_type ||
1320 t == TypeManager.float_type)
1322 else if (t == TypeManager.int64_type ||
1323 t == TypeManager.uint64_type ||
1324 t == TypeManager.double_type)
1326 else if (t == TypeManager.byte_type ||
1327 t == TypeManager.sbyte_type ||
1328 t == TypeManager.bool_type)
1330 else if (t == TypeManager.short_type ||
1331 t == TypeManager.char_type ||
1332 t == TypeManager.ushort_type)
1334 else if (t == TypeManager.decimal_type)
1340 public static void Error_NegativeArrayIndex (Location loc)
1342 Report.Error (248, loc, "Cannot create an array with a negative size");
1346 // Converts `source' to an int, uint, long or ulong.
1348 public Expression ExpressionToArrayArgument (EmitContext ec, Expression source, Location loc)
1352 bool old_checked = ec.CheckState;
1353 ec.CheckState = true;
1355 target = Convert.ImplicitConversion (ec, source, TypeManager.int32_type, loc);
1356 if (target == null){
1357 target = Convert.ImplicitConversion (ec, source, TypeManager.uint32_type, loc);
1358 if (target == null){
1359 target = Convert.ImplicitConversion (ec, source, TypeManager.int64_type, loc);
1360 if (target == null){
1361 target = Convert.ImplicitConversion (ec, source, TypeManager.uint64_type, loc);
1363 Convert.Error_CannotImplicitConversion (loc, source.Type, TypeManager.int32_type);
1367 ec.CheckState = old_checked;
1370 // Only positive constants are allowed at compile time
1372 if (target is Constant){
1373 if (target is IntConstant){
1374 if (((IntConstant) target).Value < 0){
1375 Error_NegativeArrayIndex (loc);
1380 if (target is LongConstant){
1381 if (((LongConstant) target).Value < 0){
1382 Error_NegativeArrayIndex (loc);
1395 /// This is just a base class for expressions that can
1396 /// appear on statements (invocations, object creation,
1397 /// assignments, post/pre increment and decrement). The idea
1398 /// being that they would support an extra Emition interface that
1399 /// does not leave a result on the stack.
1401 public abstract class ExpressionStatement : Expression {
1403 public virtual ExpressionStatement ResolveStatement (EmitContext ec)
1405 Expression e = Resolve (ec);
1409 ExpressionStatement es = e as ExpressionStatement;
1411 Error (201, "Only assignment, call, increment, decrement and new object " +
1412 "expressions can be used as a statement");
1418 /// Requests the expression to be emitted in a `statement'
1419 /// context. This means that no new value is left on the
1420 /// stack after invoking this method (constrasted with
1421 /// Emit that will always leave a value on the stack).
1423 public abstract void EmitStatement (EmitContext ec);
1427 /// This kind of cast is used to encapsulate the child
1428 /// whose type is child.Type into an expression that is
1429 /// reported to return "return_type". This is used to encapsulate
1430 /// expressions which have compatible types, but need to be dealt
1431 /// at higher levels with.
1433 /// For example, a "byte" expression could be encapsulated in one
1434 /// of these as an "unsigned int". The type for the expression
1435 /// would be "unsigned int".
1438 public class EmptyCast : Expression {
1439 protected Expression child;
1441 public Expression Child {
1447 public EmptyCast (Expression child, Type return_type)
1449 eclass = child.eclass;
1450 loc = child.Location;
1455 public override Expression DoResolve (EmitContext ec)
1457 // This should never be invoked, we are born in fully
1458 // initialized state.
1463 public override void Emit (EmitContext ec)
1470 // We need to special case this since an empty cast of
1471 // a NullLiteral is still a Constant
1473 public class NullCast : Constant {
1474 protected Expression child;
1476 public NullCast (Expression child, Type return_type)
1478 eclass = child.eclass;
1483 override public string AsString ()
1488 public override object GetValue ()
1493 public override Expression DoResolve (EmitContext ec)
1495 // This should never be invoked, we are born in fully
1496 // initialized state.
1501 public override void Emit (EmitContext ec)
1506 public override bool IsDefaultValue {
1508 throw new NotImplementedException ();
1512 public override bool IsNegative {
1521 /// This class is used to wrap literals which belong inside Enums
1523 public class EnumConstant : Constant {
1524 public Constant Child;
1526 public EnumConstant (Constant child, Type enum_type)
1528 eclass = child.eclass;
1533 public override Expression DoResolve (EmitContext ec)
1535 // This should never be invoked, we are born in fully
1536 // initialized state.
1541 public override void Emit (EmitContext ec)
1546 public override object GetValue ()
1548 return Child.GetValue ();
1551 public object GetValueAsEnumType ()
1553 return System.Enum.ToObject (type, Child.GetValue ());
1557 // Converts from one of the valid underlying types for an enumeration
1558 // (int32, uint32, int64, uint64, short, ushort, byte, sbyte) to
1559 // one of the internal compiler literals: Int/UInt/Long/ULong Literals.
1561 public Constant WidenToCompilerConstant ()
1563 Type t = TypeManager.EnumToUnderlying (Child.Type);
1564 object v = ((Constant) Child).GetValue ();;
1566 if (t == TypeManager.int32_type)
1567 return new IntConstant ((int) v);
1568 if (t == TypeManager.uint32_type)
1569 return new UIntConstant ((uint) v);
1570 if (t == TypeManager.int64_type)
1571 return new LongConstant ((long) v);
1572 if (t == TypeManager.uint64_type)
1573 return new ULongConstant ((ulong) v);
1574 if (t == TypeManager.short_type)
1575 return new ShortConstant ((short) v);
1576 if (t == TypeManager.ushort_type)
1577 return new UShortConstant ((ushort) v);
1578 if (t == TypeManager.byte_type)
1579 return new ByteConstant ((byte) v);
1580 if (t == TypeManager.sbyte_type)
1581 return new SByteConstant ((sbyte) v);
1583 throw new Exception ("Invalid enumeration underlying type: " + t);
1587 // Extracts the value in the enumeration on its native representation
1589 public object GetPlainValue ()
1591 Type t = TypeManager.EnumToUnderlying (Child.Type);
1592 object v = ((Constant) Child).GetValue ();;
1594 if (t == TypeManager.int32_type)
1596 if (t == TypeManager.uint32_type)
1598 if (t == TypeManager.int64_type)
1600 if (t == TypeManager.uint64_type)
1602 if (t == TypeManager.short_type)
1604 if (t == TypeManager.ushort_type)
1606 if (t == TypeManager.byte_type)
1608 if (t == TypeManager.sbyte_type)
1614 public override string AsString ()
1616 return Child.AsString ();
1619 public override DoubleConstant ConvertToDouble ()
1621 return Child.ConvertToDouble ();
1624 public override FloatConstant ConvertToFloat ()
1626 return Child.ConvertToFloat ();
1629 public override ULongConstant ConvertToULong ()
1631 return Child.ConvertToULong ();
1634 public override LongConstant ConvertToLong ()
1636 return Child.ConvertToLong ();
1639 public override UIntConstant ConvertToUInt ()
1641 return Child.ConvertToUInt ();
1644 public override IntConstant ConvertToInt ()
1646 return Child.ConvertToInt ();
1649 public override bool IsDefaultValue {
1651 return Child.IsDefaultValue;
1655 public override bool IsZeroInteger {
1656 get { return Child.IsZeroInteger; }
1659 public override bool IsNegative {
1661 return Child.IsNegative;
1667 /// This kind of cast is used to encapsulate Value Types in objects.
1669 /// The effect of it is to box the value type emitted by the previous
1672 public class BoxedCast : EmptyCast {
1674 public BoxedCast (Expression expr)
1675 : base (expr, TypeManager.object_type)
1677 eclass = ExprClass.Value;
1680 public BoxedCast (Expression expr, Type target_type)
1681 : base (expr, target_type)
1683 eclass = ExprClass.Value;
1686 public override Expression DoResolve (EmitContext ec)
1688 // This should never be invoked, we are born in fully
1689 // initialized state.
1694 public override void Emit (EmitContext ec)
1698 ec.ig.Emit (OpCodes.Box, child.Type);
1702 public class UnboxCast : EmptyCast {
1703 public UnboxCast (Expression expr, Type return_type)
1704 : base (expr, return_type)
1708 public override Expression DoResolve (EmitContext ec)
1710 // This should never be invoked, we are born in fully
1711 // initialized state.
1716 public override void Emit (EmitContext ec)
1719 ILGenerator ig = ec.ig;
1722 if (t.IsGenericParameter)
1723 ig.Emit (OpCodes.Unbox_Any, t);
1725 ig.Emit (OpCodes.Unbox, t);
1727 LoadFromPtr (ig, t);
1733 /// This is used to perform explicit numeric conversions.
1735 /// Explicit numeric conversions might trigger exceptions in a checked
1736 /// context, so they should generate the conv.ovf opcodes instead of
1739 public class ConvCast : EmptyCast {
1740 public enum Mode : byte {
1741 I1_U1, I1_U2, I1_U4, I1_U8, I1_CH,
1743 I2_I1, I2_U1, I2_U2, I2_U4, I2_U8, I2_CH,
1744 U2_I1, U2_U1, U2_I2, U2_CH,
1745 I4_I1, I4_U1, I4_I2, I4_U2, I4_U4, I4_U8, I4_CH,
1746 U4_I1, U4_U1, U4_I2, U4_U2, U4_I4, U4_CH,
1747 I8_I1, I8_U1, I8_I2, I8_U2, I8_I4, I8_U4, I8_U8, I8_CH,
1748 U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH,
1749 CH_I1, CH_U1, CH_I2,
1750 R4_I1, R4_U1, R4_I2, R4_U2, R4_I4, R4_U4, R4_I8, R4_U8, R4_CH,
1751 R8_I1, R8_U1, R8_I2, R8_U2, R8_I4, R8_U4, R8_I8, R8_U8, R8_CH, R8_R4
1757 public ConvCast (EmitContext ec, Expression child, Type return_type, Mode m)
1758 : base (child, return_type)
1760 checked_state = ec.CheckState;
1764 public override Expression DoResolve (EmitContext ec)
1766 // This should never be invoked, we are born in fully
1767 // initialized state.
1772 public override string ToString ()
1774 return String.Format ("ConvCast ({0}, {1})", mode, child);
1777 public override void Emit (EmitContext ec)
1779 ILGenerator ig = ec.ig;
1785 case Mode.I1_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1786 case Mode.I1_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1787 case Mode.I1_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1788 case Mode.I1_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1789 case Mode.I1_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1791 case Mode.U1_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1792 case Mode.U1_CH: /* nothing */ break;
1794 case Mode.I2_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1795 case Mode.I2_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1796 case Mode.I2_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1797 case Mode.I2_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1798 case Mode.I2_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1799 case Mode.I2_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1801 case Mode.U2_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1802 case Mode.U2_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
1803 case Mode.U2_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
1804 case Mode.U2_CH: /* nothing */ break;
1806 case Mode.I4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1807 case Mode.I4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1808 case Mode.I4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
1809 case Mode.I4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1810 case Mode.I4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1811 case Mode.I4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1812 case Mode.I4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1814 case Mode.U4_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1815 case Mode.U4_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
1816 case Mode.U4_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
1817 case Mode.U4_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
1818 case Mode.U4_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
1819 case Mode.U4_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
1821 case Mode.I8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1822 case Mode.I8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1823 case Mode.I8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
1824 case Mode.I8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1825 case Mode.I8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
1826 case Mode.I8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1827 case Mode.I8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1828 case Mode.I8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1830 case Mode.U8_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1831 case Mode.U8_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
1832 case Mode.U8_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
1833 case Mode.U8_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
1834 case Mode.U8_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
1835 case Mode.U8_U4: ig.Emit (OpCodes.Conv_Ovf_U4_Un); break;
1836 case Mode.U8_I8: ig.Emit (OpCodes.Conv_Ovf_I8_Un); break;
1837 case Mode.U8_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
1839 case Mode.CH_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
1840 case Mode.CH_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
1841 case Mode.CH_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
1843 case Mode.R4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1844 case Mode.R4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1845 case Mode.R4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
1846 case Mode.R4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1847 case Mode.R4_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
1848 case Mode.R4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1849 case Mode.R4_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
1850 case Mode.R4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1851 case Mode.R4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1853 case Mode.R8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
1854 case Mode.R8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
1855 case Mode.R8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
1856 case Mode.R8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1857 case Mode.R8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
1858 case Mode.R8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
1859 case Mode.R8_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
1860 case Mode.R8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
1861 case Mode.R8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
1862 case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
1866 case Mode.I1_U1: ig.Emit (OpCodes.Conv_U1); break;
1867 case Mode.I1_U2: ig.Emit (OpCodes.Conv_U2); break;
1868 case Mode.I1_U4: ig.Emit (OpCodes.Conv_U4); break;
1869 case Mode.I1_U8: ig.Emit (OpCodes.Conv_I8); break;
1870 case Mode.I1_CH: ig.Emit (OpCodes.Conv_U2); break;
1872 case Mode.U1_I1: ig.Emit (OpCodes.Conv_I1); break;
1873 case Mode.U1_CH: ig.Emit (OpCodes.Conv_U2); break;
1875 case Mode.I2_I1: ig.Emit (OpCodes.Conv_I1); break;
1876 case Mode.I2_U1: ig.Emit (OpCodes.Conv_U1); break;
1877 case Mode.I2_U2: ig.Emit (OpCodes.Conv_U2); break;
1878 case Mode.I2_U4: ig.Emit (OpCodes.Conv_U4); break;
1879 case Mode.I2_U8: ig.Emit (OpCodes.Conv_I8); break;
1880 case Mode.I2_CH: ig.Emit (OpCodes.Conv_U2); break;
1882 case Mode.U2_I1: ig.Emit (OpCodes.Conv_I1); break;
1883 case Mode.U2_U1: ig.Emit (OpCodes.Conv_U1); break;
1884 case Mode.U2_I2: ig.Emit (OpCodes.Conv_I2); break;
1885 case Mode.U2_CH: /* nothing */ break;
1887 case Mode.I4_I1: ig.Emit (OpCodes.Conv_I1); break;
1888 case Mode.I4_U1: ig.Emit (OpCodes.Conv_U1); break;
1889 case Mode.I4_I2: ig.Emit (OpCodes.Conv_I2); break;
1890 case Mode.I4_U4: /* nothing */ break;
1891 case Mode.I4_U2: ig.Emit (OpCodes.Conv_U2); break;
1892 case Mode.I4_U8: ig.Emit (OpCodes.Conv_I8); break;
1893 case Mode.I4_CH: ig.Emit (OpCodes.Conv_U2); break;
1895 case Mode.U4_I1: ig.Emit (OpCodes.Conv_I1); break;
1896 case Mode.U4_U1: ig.Emit (OpCodes.Conv_U1); break;
1897 case Mode.U4_I2: ig.Emit (OpCodes.Conv_I2); break;
1898 case Mode.U4_U2: ig.Emit (OpCodes.Conv_U2); break;
1899 case Mode.U4_I4: /* nothing */ break;
1900 case Mode.U4_CH: ig.Emit (OpCodes.Conv_U2); break;
1902 case Mode.I8_I1: ig.Emit (OpCodes.Conv_I1); break;
1903 case Mode.I8_U1: ig.Emit (OpCodes.Conv_U1); break;
1904 case Mode.I8_I2: ig.Emit (OpCodes.Conv_I2); break;
1905 case Mode.I8_U2: ig.Emit (OpCodes.Conv_U2); break;
1906 case Mode.I8_I4: ig.Emit (OpCodes.Conv_I4); break;
1907 case Mode.I8_U4: ig.Emit (OpCodes.Conv_U4); break;
1908 case Mode.I8_U8: /* nothing */ break;
1909 case Mode.I8_CH: ig.Emit (OpCodes.Conv_U2); break;
1911 case Mode.U8_I1: ig.Emit (OpCodes.Conv_I1); break;
1912 case Mode.U8_U1: ig.Emit (OpCodes.Conv_U1); break;
1913 case Mode.U8_I2: ig.Emit (OpCodes.Conv_I2); break;
1914 case Mode.U8_U2: ig.Emit (OpCodes.Conv_U2); break;
1915 case Mode.U8_I4: ig.Emit (OpCodes.Conv_I4); break;
1916 case Mode.U8_U4: ig.Emit (OpCodes.Conv_U4); break;
1917 case Mode.U8_I8: /* nothing */ break;
1918 case Mode.U8_CH: ig.Emit (OpCodes.Conv_U2); break;
1920 case Mode.CH_I1: ig.Emit (OpCodes.Conv_I1); break;
1921 case Mode.CH_U1: ig.Emit (OpCodes.Conv_U1); break;
1922 case Mode.CH_I2: ig.Emit (OpCodes.Conv_I2); break;
1924 case Mode.R4_I1: ig.Emit (OpCodes.Conv_I1); break;
1925 case Mode.R4_U1: ig.Emit (OpCodes.Conv_U1); break;
1926 case Mode.R4_I2: ig.Emit (OpCodes.Conv_I2); break;
1927 case Mode.R4_U2: ig.Emit (OpCodes.Conv_U2); break;
1928 case Mode.R4_I4: ig.Emit (OpCodes.Conv_I4); break;
1929 case Mode.R4_U4: ig.Emit (OpCodes.Conv_U4); break;
1930 case Mode.R4_I8: ig.Emit (OpCodes.Conv_I8); break;
1931 case Mode.R4_U8: ig.Emit (OpCodes.Conv_U8); break;
1932 case Mode.R4_CH: ig.Emit (OpCodes.Conv_U2); break;
1934 case Mode.R8_I1: ig.Emit (OpCodes.Conv_I1); break;
1935 case Mode.R8_U1: ig.Emit (OpCodes.Conv_U1); break;
1936 case Mode.R8_I2: ig.Emit (OpCodes.Conv_I2); break;
1937 case Mode.R8_U2: ig.Emit (OpCodes.Conv_U2); break;
1938 case Mode.R8_I4: ig.Emit (OpCodes.Conv_I4); break;
1939 case Mode.R8_U4: ig.Emit (OpCodes.Conv_U4); break;
1940 case Mode.R8_I8: ig.Emit (OpCodes.Conv_I8); break;
1941 case Mode.R8_U8: ig.Emit (OpCodes.Conv_U8); break;
1942 case Mode.R8_CH: ig.Emit (OpCodes.Conv_U2); break;
1943 case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
1949 public class OpcodeCast : EmptyCast {
1953 public OpcodeCast (Expression child, Type return_type, OpCode op)
1954 : base (child, return_type)
1958 second_valid = false;
1961 public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
1962 : base (child, return_type)
1967 second_valid = true;
1970 public override Expression DoResolve (EmitContext ec)
1972 // This should never be invoked, we are born in fully
1973 // initialized state.
1978 public override void Emit (EmitContext ec)
1989 /// This kind of cast is used to encapsulate a child and cast it
1990 /// to the class requested
1992 public class ClassCast : EmptyCast {
1993 public ClassCast (Expression child, Type return_type)
1994 : base (child, return_type)
1999 public override Expression DoResolve (EmitContext ec)
2001 // This should never be invoked, we are born in fully
2002 // initialized state.
2007 public override void Emit (EmitContext ec)
2011 if (child.Type.IsGenericParameter)
2012 ec.ig.Emit (OpCodes.Box, child.Type);
2014 if (type.IsGenericParameter)
2015 ec.ig.Emit (OpCodes.Unbox_Any, type);
2017 ec.ig.Emit (OpCodes.Castclass, type);
2022 /// SimpleName expressions are formed of a single word and only happen at the beginning
2023 /// of a dotted-name.
2025 public class SimpleName : Expression {
2027 public readonly TypeArguments Arguments;
2029 public SimpleName (string name, Location l)
2035 public SimpleName (string name, TypeArguments args, Location l)
2042 public static void Error_ObjectRefRequired (EmitContext ec, Location l, string name)
2044 if (ec.IsFieldInitializer)
2047 "A field initializer cannot reference the non-static field, " +
2048 "method or property `"+name+"'");
2052 "An object reference is required " +
2053 "for the non-static field `"+name+"'");
2057 // Checks whether we are trying to access an instance
2058 // property, method or field from a static body.
2060 Expression MemberStaticCheck (EmitContext ec, Expression e)
2062 if (e is IMemberExpr){
2063 IMemberExpr member = (IMemberExpr) e;
2065 if (!member.IsStatic){
2066 Error_ObjectRefRequired (ec, loc, Name);
2074 public override Expression DoResolve (EmitContext ec)
2076 return SimpleNameResolve (ec, null, false, false);
2079 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
2081 return SimpleNameResolve (ec, right_side, false, false);
2085 public Expression DoResolveAllowStatic (EmitContext ec, bool intermediate)
2087 return SimpleNameResolve (ec, null, true, intermediate);
2090 public override FullNamedExpression ResolveAsTypeStep (EmitContext ec)
2092 DeclSpace ds = ec.DeclSpace;
2093 FullNamedExpression dt;
2095 dt = ds.LookupGeneric (Name, loc);
2097 return dt.ResolveAsTypeStep (ec);
2099 int errors = Report.Errors;
2100 dt = ec.ResolvingTypeTree
2101 ? ds.FindType (loc, Name)
2102 : ds.LookupType (Name, loc, /*silent=*/ true, /*ignore_cs0104=*/ false);
2103 if (Report.Errors != errors)
2109 Expression SimpleNameResolve (EmitContext ec, Expression right_side,
2110 bool allow_static, bool intermediate)
2112 Expression e = DoSimpleNameResolve (ec, right_side, allow_static, intermediate);
2116 Block current_block = ec.CurrentBlock;
2117 if (current_block != null){
2118 if (current_block.IsVariableNameUsedInChildBlock (Name)) {
2119 Report.Error (135, Location,
2120 "'{0}' has a different meaning in a child block", Name);
2125 if (e.Type != null && e.Type.IsPointer && !ec.InUnsafe) {
2134 /// 7.5.2: Simple Names.
2136 /// Local Variables and Parameters are handled at
2137 /// parse time, so they never occur as SimpleNames.
2139 /// The `allow_static' flag is used by MemberAccess only
2140 /// and it is used to inform us that it is ok for us to
2141 /// avoid the static check, because MemberAccess might end
2142 /// up resolving the Name as a Type name and the access as
2143 /// a static type access.
2145 /// ie: Type Type; .... { Type.GetType (""); }
2147 /// Type is both an instance variable and a Type; Type.GetType
2148 /// is the static method not an instance method of type.
2150 Expression DoSimpleNameResolve (EmitContext ec, Expression right_side, bool allow_static, bool intermediate)
2152 Expression e = null;
2155 // Stage 1: Performed by the parser (binding to locals or parameters).
2157 Block current_block = ec.CurrentBlock;
2158 if (current_block != null){
2159 LocalInfo vi = current_block.GetLocalInfo (Name);
2163 var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
2165 if (right_side != null)
2166 return var.ResolveLValue (ec, right_side);
2168 return var.Resolve (ec);
2171 ParameterReference pref = current_block.GetParameterReference (Name, loc);
2173 if (right_side != null)
2174 return pref.ResolveLValue (ec, right_side);
2176 return pref.Resolve (ec);
2181 // Stage 2: Lookup members
2184 DeclSpace lookup_ds = ec.DeclSpace;
2185 Type almost_matched_type = null;
2186 ArrayList almost_matched = null;
2188 if (lookup_ds.TypeBuilder == null)
2191 e = MemberLookup (ec, lookup_ds.TypeBuilder, Name, loc);
2195 if (almost_matched == null && almostMatchedMembers.Count > 0) {
2196 almost_matched_type = lookup_ds.TypeBuilder;
2197 almost_matched = (ArrayList) almostMatchedMembers.Clone ();
2200 lookup_ds =lookup_ds.Parent;
2201 } while (lookup_ds != null);
2203 if (e == null && ec.ContainerType != null)
2204 e = MemberLookup (ec, ec.ContainerType, Name, loc);
2207 if (almost_matched == null && almostMatchedMembers.Count > 0) {
2208 almost_matched_type = ec.ContainerType;
2209 almost_matched = (ArrayList) almostMatchedMembers.Clone ();
2211 e = ResolveAsTypeStep (ec);
2215 if (almost_matched != null)
2216 almostMatchedMembers = almost_matched;
2217 if (almost_matched_type == null)
2218 almost_matched_type = ec.ContainerType;
2219 MemberLookupFailed (ec, null, almost_matched_type, ((SimpleName) this).Name, ec.DeclSpace.Name, true, loc);
2226 if (e is IMemberExpr) {
2227 e = MemberAccess.ResolveMemberAccess (ec, e, null, loc, this);
2231 IMemberExpr me = e as IMemberExpr;
2235 if (Arguments != null) {
2236 MethodGroupExpr mg = me as MethodGroupExpr;
2240 return mg.ResolveGeneric (ec, Arguments);
2243 // This fails if ResolveMemberAccess() was unable to decide whether
2244 // it's a field or a type of the same name.
2246 if (!me.IsStatic && (me.InstanceExpression == null))
2250 TypeManager.IsNestedFamilyAccessible (me.InstanceExpression.Type, me.DeclaringType) &&
2251 me.InstanceExpression.Type != me.DeclaringType &&
2252 !TypeManager.IsFamilyAccessible (me.InstanceExpression.Type, me.DeclaringType) &&
2253 (!intermediate || !MemberAccess.IdenticalNameAndTypeName (ec, this, e, loc))) {
2254 Error (38, "Cannot access nonstatic member `" + me.Name + "' of " +
2255 "outer type `" + me.DeclaringType + "' via nested type `" +
2256 me.InstanceExpression.Type + "'");
2260 return (right_side != null)
2261 ? e.DoResolveLValue (ec, right_side)
2265 if (ec.IsStatic || ec.IsFieldInitializer){
2269 return MemberStaticCheck (ec, e);
2274 public override void Emit (EmitContext ec)
2277 // If this is ever reached, then we failed to
2278 // find the name as a namespace
2281 Error (103, "The name `" + Name +
2282 "' does not exist in the class `" +
2283 ec.DeclSpace.Name + "'");
2286 public override string ToString ()
2293 /// Represents a namespace or a type. The name of the class was inspired by
2294 /// section 10.8.1 (Fully Qualified Names).
2296 public abstract class FullNamedExpression : Expression {
2297 public override FullNamedExpression ResolveAsTypeStep (EmitContext ec)
2302 public abstract string FullName {
2308 /// Fully resolved expression that evaluates to a type
2310 public abstract class TypeExpr : FullNamedExpression {
2311 override public FullNamedExpression ResolveAsTypeStep (EmitContext ec)
2313 TypeExpr t = DoResolveAsTypeStep (ec);
2317 eclass = ExprClass.Type;
2321 override public Expression DoResolve (EmitContext ec)
2323 return ResolveAsTypeTerminal (ec);
2326 override public void Emit (EmitContext ec)
2328 throw new Exception ("Should never be called");
2331 public virtual bool CheckAccessLevel (DeclSpace ds)
2333 return ds.CheckAccessLevel (Type);
2336 public virtual bool AsAccessible (DeclSpace ds, int flags)
2338 return ds.AsAccessible (Type, flags);
2341 public virtual bool IsClass {
2342 get { return Type.IsClass; }
2345 public virtual bool IsValueType {
2346 get { return Type.IsValueType; }
2349 public virtual bool IsInterface {
2350 get { return Type.IsInterface; }
2353 public virtual bool IsSealed {
2354 get { return Type.IsSealed; }
2357 public virtual bool CanInheritFrom ()
2359 if (Type == TypeManager.enum_type ||
2360 (Type == TypeManager.value_type && RootContext.StdLib) ||
2361 Type == TypeManager.multicast_delegate_type ||
2362 Type == TypeManager.delegate_type ||
2363 Type == TypeManager.array_type)
2369 protected abstract TypeExpr DoResolveAsTypeStep (EmitContext ec);
2371 public virtual Type ResolveType (EmitContext ec)
2373 TypeExpr t = ResolveAsTypeTerminal (ec);
2380 public abstract string Name {
2384 public override bool Equals (object obj)
2386 TypeExpr tobj = obj as TypeExpr;
2390 return Type == tobj.Type;
2393 public override int GetHashCode ()
2395 return Type.GetHashCode ();
2398 public override string ToString ()
2404 public class TypeExpression : TypeExpr {
2405 public TypeExpression (Type t, Location l)
2408 eclass = ExprClass.Type;
2412 protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
2417 public override string Name {
2419 return Type.ToString ();
2423 public override string FullName {
2425 return Type.FullName != null ? Type.FullName : Type.Name;
2431 /// Used to create types from a fully qualified name. These are just used
2432 /// by the parser to setup the core types. A TypeLookupExpression is always
2433 /// classified as a type.
2435 public class TypeLookupExpression : TypeExpr {
2438 public TypeLookupExpression (string name)
2443 protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
2446 FullNamedExpression t = ec.DeclSpace.LookupType (
2447 name, Location.Null, /*silent=*/ false, /*ignore_cs0104=*/ false);
2450 if (!(t is TypeExpr))
2452 type = ((TypeExpr) t).ResolveType (ec);
2458 public override string Name {
2464 public override string FullName {
2472 /// Represents an "unbound generic type", ie. typeof (Foo<>).
2475 public class UnboundTypeExpression : TypeLookupExpression {
2476 public UnboundTypeExpression (string name)
2481 public class TypeAliasExpression : TypeExpr {
2482 FullNamedExpression alias;
2487 public TypeAliasExpression (FullNamedExpression alias, TypeArguments args, Location l)
2493 eclass = ExprClass.Type;
2495 name = alias.FullName + "<" + args.ToString () + ">";
2497 name = alias.FullName;
2500 public override string Name {
2501 get { return alias.FullName; }
2504 public override string FullName {
2505 get { return name; }
2508 protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
2510 texpr = alias.ResolveAsTypeTerminal (ec);
2514 Type type = texpr.Type;
2515 int num_args = TypeManager.GetNumberOfTypeArguments (type);
2518 if (num_args == 0) {
2519 Report.Error (308, loc,
2520 "The non-generic type `{0}' cannot " +
2521 "be used with type arguments.",
2522 TypeManager.CSharpName (type));
2526 ConstructedType ctype = new ConstructedType (type, args, loc);
2527 return ctype.ResolveAsTypeTerminal (ec);
2528 } else if (num_args > 0) {
2529 Report.Error (305, loc,
2530 "Using the generic type `{0}' " +
2531 "requires {1} type arguments",
2532 TypeManager.GetFullName (type), num_args);
2536 return new TypeExpression (type, loc);
2539 public override bool CheckAccessLevel (DeclSpace ds)
2541 return texpr.CheckAccessLevel (ds);
2544 public override bool AsAccessible (DeclSpace ds, int flags)
2546 return texpr.AsAccessible (ds, flags);
2549 public override bool IsClass {
2550 get { return texpr.IsClass; }
2553 public override bool IsValueType {
2554 get { return texpr.IsValueType; }
2557 public override bool IsInterface {
2558 get { return texpr.IsInterface; }
2561 public override bool IsSealed {
2562 get { return texpr.IsSealed; }
2567 /// MethodGroup Expression.
2569 /// This is a fully resolved expression that evaluates to a type
2571 public class MethodGroupExpr : Expression, IMemberExpr {
2572 public MethodBase [] Methods;
2573 Expression instance_expression = null;
2574 bool is_explicit_impl = false;
2575 bool has_type_arguments = false;
2576 bool identical_type_name = false;
2579 public MethodGroupExpr (MemberInfo [] mi, Location l)
2581 Methods = new MethodBase [mi.Length];
2582 mi.CopyTo (Methods, 0);
2583 eclass = ExprClass.MethodGroup;
2584 type = TypeManager.object_type;
2588 public MethodGroupExpr (ArrayList list, Location l)
2590 Methods = new MethodBase [list.Count];
2593 list.CopyTo (Methods, 0);
2595 foreach (MemberInfo m in list){
2596 if (!(m is MethodBase)){
2597 Console.WriteLine ("Name " + m.Name);
2598 Console.WriteLine ("Found a: " + m.GetType ().FullName);
2605 eclass = ExprClass.MethodGroup;
2606 type = TypeManager.object_type;
2609 public Type DeclaringType {
2612 // We assume that the top-level type is in the end
2614 return Methods [Methods.Length - 1].DeclaringType;
2615 //return Methods [0].DeclaringType;
2620 // `A method group may have associated an instance expression'
2622 public Expression InstanceExpression {
2624 return instance_expression;
2628 instance_expression = value;
2632 public bool IsExplicitImpl {
2634 return is_explicit_impl;
2638 is_explicit_impl = value;
2642 public bool HasTypeArguments {
2644 return has_type_arguments;
2648 has_type_arguments = value;
2652 public bool IdenticalTypeName {
2654 return identical_type_name;
2658 identical_type_name = value;
2662 public bool IsBase {
2671 public string Name {
2673 //return Methods [0].Name;
2674 return Methods [Methods.Length - 1].Name;
2678 public bool IsInstance {
2680 foreach (MethodBase mb in Methods)
2688 public bool IsStatic {
2690 foreach (MethodBase mb in Methods)
2698 override public Expression DoResolve (EmitContext ec)
2701 instance_expression = null;
2703 if (instance_expression != null) {
2704 instance_expression = instance_expression.DoResolve (ec);
2705 if (instance_expression == null)
2712 public void ReportUsageError ()
2714 Report.Error (654, loc, "Method `" + DeclaringType + "." +
2715 Name + "()' is referenced without parentheses");
2718 override public void Emit (EmitContext ec)
2720 ReportUsageError ();
2723 bool RemoveMethods (bool keep_static)
2725 ArrayList smethods = new ArrayList ();
2727 foreach (MethodBase mb in Methods){
2728 if (mb.IsStatic == keep_static)
2732 if (smethods.Count == 0)
2735 Methods = new MethodBase [smethods.Count];
2736 smethods.CopyTo (Methods, 0);
2742 /// Removes any instance methods from the MethodGroup, returns
2743 /// false if the resulting set is empty.
2745 public bool RemoveInstanceMethods ()
2747 return RemoveMethods (true);
2751 /// Removes any static methods from the MethodGroup, returns
2752 /// false if the resulting set is empty.
2754 public bool RemoveStaticMethods ()
2756 return RemoveMethods (false);
2759 public Expression ResolveGeneric (EmitContext ec, TypeArguments args)
2761 if (args.Resolve (ec) == false)
2764 Type[] atypes = args.Arguments;
2766 int first_count = 0;
2767 MethodInfo first = null;
2769 ArrayList list = new ArrayList ();
2770 foreach (MethodBase mb in Methods) {
2771 MethodInfo mi = mb as MethodInfo;
2772 if ((mi == null) || !mi.HasGenericParameters)
2775 Type[] gen_params = mi.GetGenericArguments ();
2777 if (first == null) {
2779 first_count = gen_params.Length;
2782 if (gen_params.Length != atypes.Length)
2785 list.Add (mi.BindGenericParameters (atypes));
2788 if (list.Count > 0) {
2789 MethodGroupExpr new_mg = new MethodGroupExpr (list, Location);
2790 new_mg.InstanceExpression = InstanceExpression;
2791 new_mg.HasTypeArguments = true;
2797 305, loc, "Using the generic method `{0}' " +
2798 "requires {1} type arguments", Name,
2802 308, loc, "The non-generic method `{0}' " +
2803 "cannot be used with type arguments", Name);
2810 /// Fully resolved expression that evaluates to a Field
2812 public class FieldExpr : Expression, IAssignMethod, IMemoryLocation, IMemberExpr, IVariable {
2813 public readonly FieldInfo FieldInfo;
2814 Expression instance_expr;
2815 VariableInfo variable_info;
2817 LocalTemporary temp;
2819 bool is_field_initializer;
2821 public FieldExpr (FieldInfo fi, Location l)
2824 eclass = ExprClass.Variable;
2825 type = TypeManager.TypeToCoreType (fi.FieldType);
2829 public string Name {
2831 return FieldInfo.Name;
2835 public bool IsInstance {
2837 return !FieldInfo.IsStatic;
2841 public bool IsStatic {
2843 return FieldInfo.IsStatic;
2847 public Type DeclaringType {
2849 return FieldInfo.DeclaringType;
2853 public Expression InstanceExpression {
2855 return instance_expr;
2859 instance_expr = value;
2863 public bool IsFieldInitializer {
2865 return is_field_initializer;
2869 is_field_initializer = value;
2873 public VariableInfo VariableInfo {
2875 return variable_info;
2879 override public Expression DoResolve (EmitContext ec)
2881 if (!FieldInfo.IsStatic){
2882 if (instance_expr == null){
2884 // This can happen when referencing an instance field using
2885 // a fully qualified type expression: TypeName.InstanceField = xxx
2887 SimpleName.Error_ObjectRefRequired (ec, loc, FieldInfo.Name);
2891 // Resolve the field's instance expression while flow analysis is turned
2892 // off: when accessing a field "a.b", we must check whether the field
2893 // "a.b" is initialized, not whether the whole struct "a" is initialized.
2894 instance_expr = instance_expr.Resolve (ec, ResolveFlags.VariableOrValue |
2895 ResolveFlags.DisableFlowAnalysis);
2896 if (instance_expr == null)
2900 ObsoleteAttribute oa;
2901 FieldBase f = TypeManager.GetField (FieldInfo);
2903 oa = f.GetObsoleteAttribute (f.Parent);
2905 AttributeTester.Report_ObsoleteMessage (oa, f.GetSignatureForError (), loc);
2906 // To be sure that type is external because we do not register generated fields
2907 } else if (!(FieldInfo.DeclaringType is TypeBuilder)) {
2908 oa = AttributeTester.GetMemberObsoleteAttribute (FieldInfo);
2910 AttributeTester.Report_ObsoleteMessage (oa, TypeManager.GetFullNameSignature (FieldInfo), loc);
2913 if (ec.CurrentAnonymousMethod != null){
2914 if (!FieldInfo.IsStatic){
2915 if (ec.TypeContainer is Struct){
2916 Report.Error (1673, loc, "Can not reference instance variables in anonymous methods hosted in structs");
2919 ec.CaptureField (this);
2923 // If the instance expression is a local variable or parameter.
2924 IVariable var = instance_expr as IVariable;
2925 if ((var == null) || (var.VariableInfo == null))
2928 VariableInfo vi = var.VariableInfo;
2929 if (!vi.IsFieldAssigned (ec, FieldInfo.Name, loc))
2932 variable_info = vi.GetSubStruct (FieldInfo.Name);
2936 void Report_AssignToReadonly (bool is_instance)
2941 msg = "Readonly field can not be assigned outside " +
2942 "of constructor or variable initializer";
2944 msg = "A static readonly field can only be assigned in " +
2945 "a static constructor";
2947 Report.Error (is_instance ? 191 : 198, loc, msg);
2950 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
2952 IVariable var = instance_expr as IVariable;
2953 if ((var != null) && (var.VariableInfo != null))
2954 var.VariableInfo.SetFieldAssigned (ec, FieldInfo.Name);
2956 Expression e = DoResolve (ec);
2961 if (!FieldInfo.IsStatic && (instance_expr.Type.IsValueType && !(instance_expr is IMemoryLocation))) {
2962 // FIXME: Provide better error reporting.
2963 Error (1612, "Cannot modify expression because it is not a variable.");
2967 if (!FieldInfo.IsInitOnly)
2970 FieldBase fb = TypeManager.GetField (FieldInfo);
2975 // InitOnly fields can only be assigned in constructors
2978 if (ec.IsConstructor){
2979 if (IsStatic && !ec.IsStatic)
2980 Report_AssignToReadonly (false);
2983 if (!is_field_initializer &&
2984 (ec.TypeContainer.CurrentType != null))
2985 ctype = ec.TypeContainer.CurrentType;
2987 ctype = ec.ContainerType;
2989 if (TypeManager.IsEqual (ctype, FieldInfo.DeclaringType))
2993 Report_AssignToReadonly (!IsStatic);
2998 public override void CheckMarshallByRefAccess (Type container)
3000 if (!IsStatic && Type.IsValueType && !container.IsSubclassOf (TypeManager.mbr_type) && DeclaringType.IsSubclassOf (TypeManager.mbr_type)) {
3001 Report.SymbolRelatedToPreviousError (DeclaringType);
3002 Report.Error (1690, loc, "Cannot call '{0}' method, property, or indexer because it is a value type member of a marshal-by-reference class", Name);
3006 public bool VerifyFixed (bool is_expression)
3008 IVariable variable = instance_expr as IVariable;
3009 if ((variable == null) || !variable.VerifyFixed (true))
3015 public void Emit (EmitContext ec, bool leave_copy)
3017 ILGenerator ig = ec.ig;
3018 bool is_volatile = false;
3020 if (FieldInfo is FieldBuilder){
3021 FieldBase f = TypeManager.GetField (FieldInfo);
3023 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
3026 f.status |= Field.Status.USED;
3030 if (FieldInfo.IsStatic){
3032 ig.Emit (OpCodes.Volatile);
3034 ig.Emit (OpCodes.Ldsfld, FieldInfo);
3040 ig.Emit (OpCodes.Volatile);
3042 IFixedBuffer ff = AttributeTester.GetFixedBuffer (FieldInfo);
3045 ig.Emit (OpCodes.Ldflda, FieldInfo);
3046 ig.Emit (OpCodes.Ldflda, ff.Element);
3049 ig.Emit (OpCodes.Ldfld, FieldInfo);
3054 ec.ig.Emit (OpCodes.Dup);
3055 if (!FieldInfo.IsStatic) {
3056 temp = new LocalTemporary (ec, this.Type);
3062 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
3064 FieldAttributes fa = FieldInfo.Attributes;
3065 bool is_static = (fa & FieldAttributes.Static) != 0;
3066 bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
3067 ILGenerator ig = ec.ig;
3068 prepared = prepare_for_load;
3070 if (is_readonly && !ec.IsConstructor){
3071 Report_AssignToReadonly (!is_static);
3077 if (prepare_for_load)
3078 ig.Emit (OpCodes.Dup);
3083 ec.ig.Emit (OpCodes.Dup);
3084 if (!FieldInfo.IsStatic) {
3085 temp = new LocalTemporary (ec, this.Type);
3090 if (FieldInfo is FieldBuilder){
3091 FieldBase f = TypeManager.GetField (FieldInfo);
3093 if ((f.ModFlags & Modifiers.VOLATILE) != 0)
3094 ig.Emit (OpCodes.Volatile);
3096 f.status |= Field.Status.ASSIGNED;
3101 ig.Emit (OpCodes.Stsfld, FieldInfo);
3103 ig.Emit (OpCodes.Stfld, FieldInfo);
3109 void EmitInstance (EmitContext ec)
3111 if (instance_expr.Type.IsValueType) {
3112 if (instance_expr is IMemoryLocation) {
3113 ((IMemoryLocation) instance_expr).AddressOf (ec, AddressOp.LoadStore);
3115 LocalTemporary t = new LocalTemporary (ec, instance_expr.Type);
3116 instance_expr.Emit (ec);
3118 t.AddressOf (ec, AddressOp.Store);
3121 instance_expr.Emit (ec);
3124 public override void Emit (EmitContext ec)
3129 public void AddressOf (EmitContext ec, AddressOp mode)
3131 ILGenerator ig = ec.ig;
3133 if (FieldInfo is FieldBuilder){
3134 FieldBase f = TypeManager.GetField (FieldInfo);
3136 if ((f.ModFlags & Modifiers.VOLATILE) != 0){
3137 Error (676, "volatile variable: can not take its address, or pass as ref/out parameter");
3141 if ((mode & AddressOp.Store) != 0)
3142 f.status |= Field.Status.ASSIGNED;
3143 if ((mode & AddressOp.Load) != 0)
3144 f.status |= Field.Status.USED;
3149 // Handle initonly fields specially: make a copy and then
3150 // get the address of the copy.
3153 if (FieldInfo.IsInitOnly){
3155 if (ec.IsConstructor){
3156 if (FieldInfo.IsStatic){
3168 local = ig.DeclareLocal (type);
3169 ig.Emit (OpCodes.Stloc, local);
3170 ig.Emit (OpCodes.Ldloca, local);
3175 if (FieldInfo.IsStatic){
3176 ig.Emit (OpCodes.Ldsflda, FieldInfo);
3179 ig.Emit (OpCodes.Ldflda, FieldInfo);
3185 // A FieldExpr whose address can not be taken
3187 public class FieldExprNoAddress : FieldExpr, IMemoryLocation {
3188 public FieldExprNoAddress (FieldInfo fi, Location loc) : base (fi, loc)
3192 public new void AddressOf (EmitContext ec, AddressOp mode)
3194 Report.Error (-215, "Report this: Taking the address of a remapped parameter not supported");
3199 /// Expression that evaluates to a Property. The Assign class
3200 /// might set the `Value' expression if we are in an assignment.
3202 /// This is not an LValue because we need to re-write the expression, we
3203 /// can not take data from the stack and store it.
3205 public class PropertyExpr : ExpressionStatement, IAssignMethod, IMemberExpr {
3206 public readonly PropertyInfo PropertyInfo;
3209 // This is set externally by the `BaseAccess' class
3212 MethodInfo getter, setter;
3215 Expression instance_expr;
3216 LocalTemporary temp;
3219 internal static PtrHashtable AccessorTable = new PtrHashtable ();
3221 public PropertyExpr (EmitContext ec, PropertyInfo pi, Location l)
3224 eclass = ExprClass.PropertyAccess;
3228 type = TypeManager.TypeToCoreType (pi.PropertyType);
3230 ResolveAccessors (ec);
3233 public string Name {
3235 return PropertyInfo.Name;
3239 public bool IsInstance {
3245 public bool IsStatic {
3251 public Type DeclaringType {
3253 return PropertyInfo.DeclaringType;
3258 // The instance expression associated with this expression
3260 public Expression InstanceExpression {
3262 instance_expr = value;
3266 return instance_expr;
3270 public bool VerifyAssignable ()
3272 if (setter == null) {
3273 Report.Error (200, loc,
3274 "The property `" + PropertyInfo.Name +
3275 "' can not be assigned to, as it has not set accessor");
3282 void FindAccessors (Type invocation_type)
3284 BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic |
3285 BindingFlags.Static | BindingFlags.Instance |
3286 BindingFlags.DeclaredOnly;
3288 Type current = PropertyInfo.DeclaringType;
3289 for (; current != null; current = current.BaseType) {
3290 MemberInfo[] group = TypeManager.MemberLookup (
3291 invocation_type, invocation_type, current,
3292 MemberTypes.Property, flags, PropertyInfo.Name, null);
3297 if (group.Length != 1)
3298 // Oooops, can this ever happen ?
3301 PropertyInfo pi = (PropertyInfo) group [0];
3304 getter = pi.GetGetMethod (true);
3307 setter = pi.GetSetMethod (true);
3309 MethodInfo accessor = getter != null ? getter : setter;
3311 if (!accessor.IsVirtual)
3317 // We also perform the permission checking here, as the PropertyInfo does not
3318 // hold the information for the accessibility of its setter/getter
3320 void ResolveAccessors (EmitContext ec)
3322 FindAccessors (ec.ContainerType);
3324 if (getter != null) {
3325 AccessorTable [getter] = PropertyInfo;
3326 is_static = getter.IsStatic;
3329 if (setter != null) {
3330 AccessorTable [setter] = PropertyInfo;
3331 is_static = setter.IsStatic;
3335 bool InstanceResolve (EmitContext ec, bool must_do_cs1540_check)
3337 if ((instance_expr == null) && ec.IsStatic && !is_static) {
3338 SimpleName.Error_ObjectRefRequired (ec, loc, PropertyInfo.Name);
3342 if (instance_expr != null) {
3343 instance_expr = instance_expr.DoResolve (ec);
3344 if (instance_expr == null)
3347 instance_expr.CheckMarshallByRefAccess (ec.ContainerType);
3350 if (must_do_cs1540_check && (instance_expr != null)) {
3351 if ((instance_expr.Type != ec.ContainerType) &&
3352 ec.ContainerType.IsSubclassOf (instance_expr.Type)) {
3353 Report.Error (1540, loc, "Cannot access protected member `" +
3354 PropertyInfo.DeclaringType + "." + PropertyInfo.Name +
3355 "' via a qualifier of type `" +
3356 TypeManager.CSharpName (instance_expr.Type) +
3357 "'; the qualifier must be of type `" +
3358 TypeManager.CSharpName (ec.ContainerType) +
3359 "' (or derived from it)");
3367 override public Expression DoResolve (EmitContext ec)
3369 if (getter != null){
3370 if (TypeManager.GetArgumentTypes (getter).Length != 0){
3372 117, loc, "`{0}' does not contain a " +
3373 "definition for `{1}'.", getter.DeclaringType,
3379 if (getter == null){
3381 // The following condition happens if the PropertyExpr was
3382 // created, but is invalid (ie, the property is inaccessible),
3383 // and we did not want to embed the knowledge about this in
3384 // the caller routine. This only avoids double error reporting.
3389 Report.Error (154, loc,
3390 "The property `" + PropertyInfo.Name +
3391 "' can not be used in " +
3392 "this context because it lacks a get accessor");
3396 bool must_do_cs1540_check;
3397 if (!IsAccessorAccessible (ec.ContainerType, getter, out must_do_cs1540_check)) {
3398 Report.Error (122, loc, "'{0}.get' is inaccessible due to its protection level", PropertyInfo.Name);
3402 if (!InstanceResolve (ec, must_do_cs1540_check))
3406 // Only base will allow this invocation to happen.
3408 if (IsBase && getter.IsAbstract){
3409 Report.Error (205, loc, "Cannot call an abstract base property: " +
3410 PropertyInfo.DeclaringType + "." +PropertyInfo.Name);
3414 if (PropertyInfo.PropertyType.IsPointer && !ec.InUnsafe){
3422 override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
3424 if (setter == null){
3426 // The following condition happens if the PropertyExpr was
3427 // created, but is invalid (ie, the property is inaccessible),
3428 // and we did not want to embed the knowledge about this in
3429 // the caller routine. This only avoids double error reporting.
3434 // TODO: Print better property name
3435 Report.Error (200, loc, "Property or indexer '{0}' cannot be assigned to -- it is read only",
3440 if (TypeManager.GetArgumentTypes (setter).Length != 1){
3442 117, loc, "`{0}' does not contain a " +
3443 "definition for `{1}'.", getter.DeclaringType,
3448 bool must_do_cs1540_check;
3449 if (!IsAccessorAccessible (ec.ContainerType, setter, out must_do_cs1540_check)) {
3450 Report.Error (122, loc, "'{0}.set' is inaccessible due to its protection level", PropertyInfo.Name);
3454 if (!InstanceResolve (ec, must_do_cs1540_check))
3458 // Only base will allow this invocation to happen.
3460 if (IsBase && setter.IsAbstract){
3461 Report.Error (205, loc, "Cannot call an abstract base property: " +
3462 PropertyInfo.DeclaringType + "." +PropertyInfo.Name);
3467 // Check that we are not making changes to a temporary memory location
3469 if (instance_expr != null && instance_expr.Type.IsValueType && !(instance_expr is IMemoryLocation)) {
3470 // FIXME: Provide better error reporting.
3471 Error (1612, "Cannot modify expression because it is not a variable.");
3480 public override void Emit (EmitContext ec)
3485 void EmitInstance (EmitContext ec)
3490 if (instance_expr.Type.IsValueType) {
3491 if (instance_expr is IMemoryLocation) {
3492 ((IMemoryLocation) instance_expr).AddressOf (ec, AddressOp.LoadStore);
3494 LocalTemporary t = new LocalTemporary (ec, instance_expr.Type);
3495 instance_expr.Emit (ec);
3497 t.AddressOf (ec, AddressOp.Store);
3500 instance_expr.Emit (ec);
3503 ec.ig.Emit (OpCodes.Dup);
3507 public void Emit (EmitContext ec, bool leave_copy)
3513 // Special case: length of single dimension array property is turned into ldlen
3515 if ((getter == TypeManager.system_int_array_get_length) ||
3516 (getter == TypeManager.int_array_get_length)){
3517 Type iet = instance_expr.Type;
3520 // System.Array.Length can be called, but the Type does not
3521 // support invoking GetArrayRank, so test for that case first
3523 if (iet != TypeManager.array_type && (iet.GetArrayRank () == 1)) {
3524 ec.ig.Emit (OpCodes.Ldlen);
3525 ec.ig.Emit (OpCodes.Conv_I4);
3530 Invocation.EmitCall (ec, IsBase, IsStatic, new EmptyAddressOf (), getter, null, loc);
3535 ec.ig.Emit (OpCodes.Dup);
3537 temp = new LocalTemporary (ec, this.Type);
3543 // Implements the IAssignMethod interface for assignments
3545 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
3547 prepared = prepare_for_load;
3553 ec.ig.Emit (OpCodes.Dup);
3555 temp = new LocalTemporary (ec, this.Type);
3560 ArrayList args = new ArrayList (1);
3561 args.Add (new Argument (new EmptyAddressOf (), Argument.AType.Expression));
3563 Invocation.EmitCall (ec, IsBase, IsStatic, new EmptyAddressOf (), setter, args, loc);
3569 override public void EmitStatement (EmitContext ec)
3572 ec.ig.Emit (OpCodes.Pop);
3577 /// Fully resolved expression that evaluates to an Event
3579 public class EventExpr : Expression, IMemberExpr {
3580 public readonly EventInfo EventInfo;
3581 Expression instance_expr;
3584 MethodInfo add_accessor, remove_accessor;
3586 public EventExpr (EventInfo ei, Location loc)
3590 eclass = ExprClass.EventAccess;
3592 add_accessor = TypeManager.GetAddMethod (ei);
3593 remove_accessor = TypeManager.GetRemoveMethod (ei);
3595 if (add_accessor.IsStatic || remove_accessor.IsStatic)
3598 if (EventInfo is MyEventBuilder){
3599 MyEventBuilder eb = (MyEventBuilder) EventInfo;
3600 type = eb.EventType;
3603 type = EventInfo.EventHandlerType;
3606 public string Name {
3608 return EventInfo.Name;
3612 public bool IsInstance {
3618 public bool IsStatic {
3624 public Type DeclaringType {
3626 return EventInfo.DeclaringType;
3630 public Expression InstanceExpression {
3632 return instance_expr;
3636 instance_expr = value;
3640 bool InstanceResolve (EmitContext ec, bool must_do_cs1540_check)
3642 if ((instance_expr == null) && ec.IsStatic && !is_static) {
3643 SimpleName.Error_ObjectRefRequired (ec, loc, EventInfo.Name);
3647 if (instance_expr != null) {
3648 instance_expr = instance_expr.DoResolve (ec);
3649 if (instance_expr == null)
3654 // This is using the same mechanism as the CS1540 check in PropertyExpr.
3655 // However, in the Event case, we reported a CS0122 instead.
3657 if (must_do_cs1540_check && (instance_expr != null)) {
3658 if ((instance_expr.Type != ec.ContainerType) &&
3659 ec.ContainerType.IsSubclassOf (instance_expr.Type)) {
3660 Report.Error (122, loc, "'{0}' is inaccessible due to its protection level",
3661 DeclaringType.Name + "." + EventInfo.Name);
3670 public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
3672 return DoResolve (ec);
3675 public override Expression DoResolve (EmitContext ec)
3677 if (instance_expr != null) {
3678 instance_expr = instance_expr.DoResolve (ec);
3679 if (instance_expr == null)
3683 bool must_do_cs1540_check;
3684 if (!(IsAccessorAccessible (ec.ContainerType, add_accessor, out must_do_cs1540_check)
3685 && IsAccessorAccessible (ec.ContainerType, remove_accessor, out must_do_cs1540_check))) {
3687 Report.Error (122, loc, "'{0}' is inaccessible due to its protection level",
3688 DeclaringType.Name + "." + EventInfo.Name);
3692 if (!InstanceResolve (ec, must_do_cs1540_check))
3698 public override void Emit (EmitContext ec)
3700 if (instance_expr is This)
3701 Report.Error (79, loc, "The event `{0}' can only appear on the left hand side of += or -=, try calling the actual delegate", Name);
3703 Report.Error (70, loc, "The event `{0}' can only appear on the left hand side of += or -= "+
3704 "(except on the defining type)", Name);
3707 public void EmitAddOrRemove (EmitContext ec, Expression source)
3709 BinaryDelegate source_del = (BinaryDelegate) source;
3710 Expression handler = source_del.Right;
3712 Argument arg = new Argument (handler, Argument.AType.Expression);
3713 ArrayList args = new ArrayList ();
3717 if (source_del.IsAddition)
3718 Invocation.EmitCall (
3719 ec, false, IsStatic, instance_expr, add_accessor, args, loc);
3721 Invocation.EmitCall (
3722 ec, false, IsStatic, instance_expr, remove_accessor, args, loc);