2 // expression.cs: Expression representation for the IL tree.
5 // Miguel de Icaza (miguel@ximian.com)
6 // Marek Safar (marek.safar@gmail.com)
8 // Copyright 2001, 2002, 2003 Ximian, Inc.
9 // Copyright 2003-2008 Novell, Inc.
13 namespace Mono.CSharp {
15 using System.Collections.Generic;
16 using System.Reflection;
17 using System.Reflection.Emit;
22 using SLE = System.Linq.Expressions;
26 // This is an user operator expression, automatically created during
29 public class UserOperatorCall : Expression {
30 public delegate Expression ExpressionTreeExpression (ResolveContext ec, MethodGroupExpr mg);
32 protected readonly Arguments arguments;
33 protected readonly MethodGroupExpr mg;
34 readonly ExpressionTreeExpression expr_tree;
36 public UserOperatorCall (MethodGroupExpr mg, Arguments args, ExpressionTreeExpression expr_tree, Location loc)
39 this.arguments = args;
40 this.expr_tree = expr_tree;
42 type = TypeManager.TypeToCoreType (((MethodInfo) mg).ReturnType);
43 eclass = ExprClass.Value;
47 public override Expression CreateExpressionTree (ResolveContext ec)
49 if (expr_tree != null)
50 return expr_tree (ec, mg);
52 Arguments args = Arguments.CreateForExpressionTree (ec, arguments,
53 new NullLiteral (loc),
54 mg.CreateExpressionTree (ec));
56 return CreateExpressionFactoryCall (ec, "Call", args);
59 protected override void CloneTo (CloneContext context, Expression target)
64 protected override Expression DoResolve (ResolveContext ec)
67 // We are born fully resolved
72 public override void Emit (EmitContext ec)
74 mg.EmitCall (ec, arguments);
78 public override SLE.Expression MakeExpression (BuilderContext ctx)
80 return SLE.Expression.Call ((MethodInfo) mg, Arguments.MakeExpression (arguments, ctx));
84 public MethodGroupExpr Method {
88 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
90 arguments.MutateHoistedGenericType (storey);
91 mg.MutateHoistedGenericType (storey);
95 public class ParenthesizedExpression : ShimExpression
97 public ParenthesizedExpression (Expression expr)
103 protected override Expression DoResolve (ResolveContext ec)
105 return expr.Resolve (ec);
108 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
110 return expr.DoResolveLValue (ec, right_side);
115 // Unary implements unary expressions.
117 public class Unary : Expression
119 public enum Operator : byte {
120 UnaryPlus, UnaryNegation, LogicalNot, OnesComplement,
124 static Type [] [] predefined_operators;
126 public readonly Operator Oper;
127 public Expression Expr;
128 Expression enum_conversion;
130 public Unary (Operator op, Expression expr)
138 // This routine will attempt to simplify the unary expression when the
139 // argument is a constant.
141 Constant TryReduceConstant (ResolveContext ec, Constant e)
143 if (e is EmptyConstantCast)
144 return TryReduceConstant (ec, ((EmptyConstantCast) e).child);
146 if (e is SideEffectConstant) {
147 Constant r = TryReduceConstant (ec, ((SideEffectConstant) e).value);
148 return r == null ? null : new SideEffectConstant (r, e, r.Location);
151 Type expr_type = e.Type;
154 case Operator.UnaryPlus:
155 // Unary numeric promotions
156 if (expr_type == TypeManager.byte_type)
157 return new IntConstant (((ByteConstant)e).Value, e.Location);
158 if (expr_type == TypeManager.sbyte_type)
159 return new IntConstant (((SByteConstant)e).Value, e.Location);
160 if (expr_type == TypeManager.short_type)
161 return new IntConstant (((ShortConstant)e).Value, e.Location);
162 if (expr_type == TypeManager.ushort_type)
163 return new IntConstant (((UShortConstant)e).Value, e.Location);
164 if (expr_type == TypeManager.char_type)
165 return new IntConstant (((CharConstant)e).Value, e.Location);
167 // Predefined operators
168 if (expr_type == TypeManager.int32_type || expr_type == TypeManager.uint32_type ||
169 expr_type == TypeManager.int64_type || expr_type == TypeManager.uint64_type ||
170 expr_type == TypeManager.float_type || expr_type == TypeManager.double_type ||
171 expr_type == TypeManager.decimal_type) {
177 case Operator.UnaryNegation:
178 // Unary numeric promotions
179 if (expr_type == TypeManager.byte_type)
180 return new IntConstant (-((ByteConstant)e).Value, e.Location);
181 if (expr_type == TypeManager.sbyte_type)
182 return new IntConstant (-((SByteConstant)e).Value, e.Location);
183 if (expr_type == TypeManager.short_type)
184 return new IntConstant (-((ShortConstant)e).Value, e.Location);
185 if (expr_type == TypeManager.ushort_type)
186 return new IntConstant (-((UShortConstant)e).Value, e.Location);
187 if (expr_type == TypeManager.char_type)
188 return new IntConstant (-((CharConstant)e).Value, e.Location);
190 // Predefined operators
191 if (expr_type == TypeManager.int32_type) {
192 int value = ((IntConstant)e).Value;
193 if (value == int.MinValue) {
194 if (ec.ConstantCheckState) {
195 ConstantFold.Error_CompileTimeOverflow (ec, loc);
200 return new IntConstant (-value, e.Location);
202 if (expr_type == TypeManager.int64_type) {
203 long value = ((LongConstant)e).Value;
204 if (value == long.MinValue) {
205 if (ec.ConstantCheckState) {
206 ConstantFold.Error_CompileTimeOverflow (ec, loc);
211 return new LongConstant (-value, e.Location);
214 if (expr_type == TypeManager.uint32_type) {
215 UIntLiteral uil = e as UIntLiteral;
217 if (uil.Value == 2147483648)
218 return new IntLiteral (int.MinValue, e.Location);
219 return new LongLiteral (-uil.Value, e.Location);
221 return new LongConstant (-((UIntConstant)e).Value, e.Location);
224 if (expr_type == TypeManager.uint64_type) {
225 ULongLiteral ull = e as ULongLiteral;
226 if (ull != null && ull.Value == 9223372036854775808)
227 return new LongLiteral (long.MinValue, e.Location);
231 if (expr_type == TypeManager.float_type) {
232 FloatLiteral fl = e as FloatLiteral;
233 // For better error reporting
235 return new FloatLiteral (-fl.Value, e.Location);
237 return new FloatConstant (-((FloatConstant)e).Value, e.Location);
239 if (expr_type == TypeManager.double_type) {
240 DoubleLiteral dl = e as DoubleLiteral;
241 // For better error reporting
243 return new DoubleLiteral (-dl.Value, e.Location);
245 return new DoubleConstant (-((DoubleConstant)e).Value, e.Location);
247 if (expr_type == TypeManager.decimal_type)
248 return new DecimalConstant (-((DecimalConstant)e).Value, e.Location);
252 case Operator.LogicalNot:
253 if (expr_type != TypeManager.bool_type)
256 bool b = (bool)e.GetValue ();
257 return new BoolConstant (!b, e.Location);
259 case Operator.OnesComplement:
260 // Unary numeric promotions
261 if (expr_type == TypeManager.byte_type)
262 return new IntConstant (~((ByteConstant)e).Value, e.Location);
263 if (expr_type == TypeManager.sbyte_type)
264 return new IntConstant (~((SByteConstant)e).Value, e.Location);
265 if (expr_type == TypeManager.short_type)
266 return new IntConstant (~((ShortConstant)e).Value, e.Location);
267 if (expr_type == TypeManager.ushort_type)
268 return new IntConstant (~((UShortConstant)e).Value, e.Location);
269 if (expr_type == TypeManager.char_type)
270 return new IntConstant (~((CharConstant)e).Value, e.Location);
272 // Predefined operators
273 if (expr_type == TypeManager.int32_type)
274 return new IntConstant (~((IntConstant)e).Value, e.Location);
275 if (expr_type == TypeManager.uint32_type)
276 return new UIntConstant (~((UIntConstant)e).Value, e.Location);
277 if (expr_type == TypeManager.int64_type)
278 return new LongConstant (~((LongConstant)e).Value, e.Location);
279 if (expr_type == TypeManager.uint64_type){
280 return new ULongConstant (~((ULongConstant)e).Value, e.Location);
282 if (e is EnumConstant) {
283 e = TryReduceConstant (ec, ((EnumConstant)e).Child);
285 e = new EnumConstant (e, expr_type);
290 throw new Exception ("Can not constant fold: " + Oper.ToString());
293 protected Expression ResolveOperator (ResolveContext ec, Expression expr)
295 eclass = ExprClass.Value;
297 if (predefined_operators == null)
298 CreatePredefinedOperatorsTable ();
300 Type expr_type = expr.Type;
301 Expression best_expr;
304 // Primitive types first
306 if (TypeManager.IsPrimitiveType (expr_type)) {
307 best_expr = ResolvePrimitivePredefinedType (expr);
308 if (best_expr == null)
311 type = best_expr.Type;
317 // E operator ~(E x);
319 if (Oper == Operator.OnesComplement && TypeManager.IsEnumType (expr_type))
320 return ResolveEnumOperator (ec, expr);
322 return ResolveUserType (ec, expr);
325 protected virtual Expression ResolveEnumOperator (ResolveContext ec, Expression expr)
327 Type underlying_type = TypeManager.GetEnumUnderlyingType (expr.Type);
328 Expression best_expr = ResolvePrimitivePredefinedType (EmptyCast.Create (expr, underlying_type));
329 if (best_expr == null)
333 enum_conversion = Convert.ExplicitNumericConversion (new EmptyExpression (best_expr.Type), underlying_type);
335 return EmptyCast.Create (this, type);
338 public override Expression CreateExpressionTree (ResolveContext ec)
340 return CreateExpressionTree (ec, null);
343 Expression CreateExpressionTree (ResolveContext ec, MethodGroupExpr user_op)
347 case Operator.AddressOf:
348 Error_PointerInsideExpressionTree (ec);
350 case Operator.UnaryNegation:
351 if (ec.HasSet (ResolveContext.Options.CheckedScope) && user_op == null && !IsFloat (type))
352 method_name = "NegateChecked";
354 method_name = "Negate";
356 case Operator.OnesComplement:
357 case Operator.LogicalNot:
360 case Operator.UnaryPlus:
361 method_name = "UnaryPlus";
364 throw new InternalErrorException ("Unknown unary operator " + Oper.ToString ());
367 Arguments args = new Arguments (2);
368 args.Add (new Argument (Expr.CreateExpressionTree (ec)));
370 args.Add (new Argument (user_op.CreateExpressionTree (ec)));
371 return CreateExpressionFactoryCall (ec, method_name, args);
374 static void CreatePredefinedOperatorsTable ()
376 predefined_operators = new Type [(int) Operator.TOP] [];
379 // 7.6.1 Unary plus operator
381 predefined_operators [(int) Operator.UnaryPlus] = new Type [] {
382 TypeManager.int32_type, TypeManager.uint32_type,
383 TypeManager.int64_type, TypeManager.uint64_type,
384 TypeManager.float_type, TypeManager.double_type,
385 TypeManager.decimal_type
389 // 7.6.2 Unary minus operator
391 predefined_operators [(int) Operator.UnaryNegation] = new Type [] {
392 TypeManager.int32_type,
393 TypeManager.int64_type,
394 TypeManager.float_type, TypeManager.double_type,
395 TypeManager.decimal_type
399 // 7.6.3 Logical negation operator
401 predefined_operators [(int) Operator.LogicalNot] = new Type [] {
402 TypeManager.bool_type
406 // 7.6.4 Bitwise complement operator
408 predefined_operators [(int) Operator.OnesComplement] = new Type [] {
409 TypeManager.int32_type, TypeManager.uint32_type,
410 TypeManager.int64_type, TypeManager.uint64_type
415 // Unary numeric promotions
417 static Expression DoNumericPromotion (Operator op, Expression expr)
419 Type expr_type = expr.Type;
420 if ((op == Operator.UnaryPlus || op == Operator.UnaryNegation || op == Operator.OnesComplement) &&
421 expr_type == TypeManager.byte_type || expr_type == TypeManager.sbyte_type ||
422 expr_type == TypeManager.short_type || expr_type == TypeManager.ushort_type ||
423 expr_type == TypeManager.char_type)
424 return Convert.ImplicitNumericConversion (expr, TypeManager.int32_type);
426 if (op == Operator.UnaryNegation && expr_type == TypeManager.uint32_type)
427 return Convert.ImplicitNumericConversion (expr, TypeManager.int64_type);
432 protected override Expression DoResolve (ResolveContext ec)
434 if (Oper == Operator.AddressOf) {
435 return ResolveAddressOf (ec);
438 Expr = Expr.Resolve (ec);
442 if (TypeManager.IsDynamicType (Expr.Type)) {
443 Arguments args = new Arguments (1);
444 args.Add (new Argument (Expr));
445 return new DynamicUnaryConversion (GetOperatorExpressionTypeName (), args, loc).Resolve (ec);
448 if (TypeManager.IsNullableType (Expr.Type))
449 return new Nullable.LiftedUnaryOperator (Oper, Expr).Resolve (ec);
452 // Attempt to use a constant folding operation.
454 Constant cexpr = Expr as Constant;
456 cexpr = TryReduceConstant (ec, cexpr);
458 return cexpr.Resolve (ec);
461 Expression expr = ResolveOperator (ec, Expr);
463 Error_OperatorCannotBeApplied (ec, loc, OperName (Oper), Expr.Type);
466 // Reduce unary operator on predefined types
468 if (expr == this && Oper == Operator.UnaryPlus)
474 public override Expression DoResolveLValue (ResolveContext ec, Expression right)
479 public override void Emit (EmitContext ec)
481 EmitOperator (ec, type);
484 protected void EmitOperator (EmitContext ec, Type type)
486 ILGenerator ig = ec.ig;
489 case Operator.UnaryPlus:
493 case Operator.UnaryNegation:
494 if (ec.HasSet (EmitContext.Options.CheckedScope) && !IsFloat (type)) {
495 ig.Emit (OpCodes.Ldc_I4_0);
496 if (type == TypeManager.int64_type)
497 ig.Emit (OpCodes.Conv_U8);
499 ig.Emit (OpCodes.Sub_Ovf);
502 ig.Emit (OpCodes.Neg);
507 case Operator.LogicalNot:
509 ig.Emit (OpCodes.Ldc_I4_0);
510 ig.Emit (OpCodes.Ceq);
513 case Operator.OnesComplement:
515 ig.Emit (OpCodes.Not);
518 case Operator.AddressOf:
519 ((IMemoryLocation)Expr).AddressOf (ec, AddressOp.LoadStore);
523 throw new Exception ("This should not happen: Operator = "
528 // Same trick as in Binary expression
530 if (enum_conversion != null)
531 enum_conversion.Emit (ec);
534 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
536 if (Oper == Operator.LogicalNot)
537 Expr.EmitBranchable (ec, target, !on_true);
539 base.EmitBranchable (ec, target, on_true);
542 public override void EmitSideEffect (EmitContext ec)
544 Expr.EmitSideEffect (ec);
547 public static void Error_OperatorCannotBeApplied (ResolveContext ec, Location loc, string oper, Type t)
549 ec.Report.Error (23, loc, "The `{0}' operator cannot be applied to operand of type `{1}'",
550 oper, TypeManager.CSharpName (t));
554 // Converts operator to System.Linq.Expressions.ExpressionType enum name
556 string GetOperatorExpressionTypeName ()
559 case Operator.OnesComplement:
560 return "OnesComplement";
561 case Operator.LogicalNot:
563 case Operator.UnaryNegation:
565 case Operator.UnaryPlus:
568 throw new NotImplementedException ("Unknown express type operator " + Oper.ToString ());
572 static bool IsFloat (Type t)
574 return t == TypeManager.float_type || t == TypeManager.double_type;
578 // Returns a stringified representation of the Operator
580 public static string OperName (Operator oper)
583 case Operator.UnaryPlus:
585 case Operator.UnaryNegation:
587 case Operator.LogicalNot:
589 case Operator.OnesComplement:
591 case Operator.AddressOf:
595 throw new NotImplementedException (oper.ToString ());
599 public override SLE.Expression MakeExpression (BuilderContext ctx)
601 var expr = Expr.MakeExpression (ctx);
602 bool is_checked = ctx.HasSet (BuilderContext.Options.CheckedScope);
605 case Operator.UnaryNegation:
606 return is_checked ? SLE.Expression.NegateChecked (expr) : SLE.Expression.Negate (expr);
607 case Operator.LogicalNot:
608 return SLE.Expression.Not (expr);
609 case Operator.OnesComplement:
610 return SLE.Expression.OnesComplement (expr);
612 throw new NotImplementedException (Oper.ToString ());
617 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
619 type = storey.MutateType (type);
620 Expr.MutateHoistedGenericType (storey);
623 Expression ResolveAddressOf (ResolveContext ec)
626 UnsafeError (ec, loc);
628 Expr = Expr.DoResolveLValue (ec, EmptyExpression.UnaryAddress);
629 if (Expr == null || Expr.eclass != ExprClass.Variable) {
630 ec.Report.Error (211, loc, "Cannot take the address of the given expression");
634 if (!TypeManager.VerifyUnmanaged (ec.Compiler, Expr.Type, loc)) {
638 IVariableReference vr = Expr as IVariableReference;
641 VariableInfo vi = vr.VariableInfo;
643 if (vi.LocalInfo != null)
644 vi.LocalInfo.Used = true;
647 // A variable is considered definitely assigned if you take its address.
652 is_fixed = vr.IsFixed;
653 vr.SetHasAddressTaken ();
656 AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, vr, loc);
659 IFixedExpression fe = Expr as IFixedExpression;
660 is_fixed = fe != null && fe.IsFixed;
663 if (!is_fixed && !ec.HasSet (ResolveContext.Options.FixedInitializerScope)) {
664 ec.Report.Error (212, loc, "You can only take the address of unfixed expression inside of a fixed statement initializer");
667 type = TypeManager.GetPointerType (Expr.Type);
668 eclass = ExprClass.Value;
672 Expression ResolvePrimitivePredefinedType (Expression expr)
674 expr = DoNumericPromotion (Oper, expr);
675 Type expr_type = expr.Type;
676 Type[] predefined = predefined_operators [(int) Oper];
677 foreach (Type t in predefined) {
685 // Perform user-operator overload resolution
687 protected virtual Expression ResolveUserOperator (ResolveContext ec, Expression expr)
689 CSharp.Operator.OpType op_type;
691 case Operator.LogicalNot:
692 op_type = CSharp.Operator.OpType.LogicalNot; break;
693 case Operator.OnesComplement:
694 op_type = CSharp.Operator.OpType.OnesComplement; break;
695 case Operator.UnaryNegation:
696 op_type = CSharp.Operator.OpType.UnaryNegation; break;
697 case Operator.UnaryPlus:
698 op_type = CSharp.Operator.OpType.UnaryPlus; break;
700 throw new InternalErrorException (Oper.ToString ());
703 string op_name = CSharp.Operator.GetMetadataName (op_type);
704 MethodGroupExpr user_op = MemberLookup (ec.Compiler, ec.CurrentType, expr.Type, op_name, MemberTypes.Method, AllBindingFlags, expr.Location) as MethodGroupExpr;
708 Arguments args = new Arguments (1);
709 args.Add (new Argument (expr));
710 user_op = user_op.OverloadResolve (ec, ref args, false, expr.Location);
715 Expr = args [0].Expr;
716 return new UserOperatorCall (user_op, args, CreateExpressionTree, expr.Location);
720 // Unary user type overload resolution
722 Expression ResolveUserType (ResolveContext ec, Expression expr)
724 Expression best_expr = ResolveUserOperator (ec, expr);
725 if (best_expr != null)
728 Type[] predefined = predefined_operators [(int) Oper];
729 foreach (Type t in predefined) {
730 Expression oper_expr = Convert.UserDefinedConversion (ec, expr, t, expr.Location, false, false);
731 if (oper_expr == null)
735 // decimal type is predefined but has user-operators
737 if (oper_expr.Type == TypeManager.decimal_type)
738 oper_expr = ResolveUserType (ec, oper_expr);
740 oper_expr = ResolvePrimitivePredefinedType (oper_expr);
742 if (oper_expr == null)
745 if (best_expr == null) {
746 best_expr = oper_expr;
750 int result = MethodGroupExpr.BetterTypeConversion (ec, best_expr.Type, t);
752 ec.Report.Error (35, loc, "Operator `{0}' is ambiguous on an operand of type `{1}'",
753 OperName (Oper), TypeManager.CSharpName (expr.Type));
758 best_expr = oper_expr;
761 if (best_expr == null)
765 // HACK: Decimal user-operator is included in standard operators
767 if (best_expr.Type == TypeManager.decimal_type)
771 type = best_expr.Type;
775 protected override void CloneTo (CloneContext clonectx, Expression t)
777 Unary target = (Unary) t;
779 target.Expr = Expr.Clone (clonectx);
784 // Unary operators are turned into Indirection expressions
785 // after semantic analysis (this is so we can take the address
786 // of an indirection).
788 public class Indirection : Expression, IMemoryLocation, IAssignMethod, IFixedExpression {
790 LocalTemporary temporary;
793 public Indirection (Expression expr, Location l)
799 public override Expression CreateExpressionTree (ResolveContext ec)
801 Error_PointerInsideExpressionTree (ec);
805 protected override void CloneTo (CloneContext clonectx, Expression t)
807 Indirection target = (Indirection) t;
808 target.expr = expr.Clone (clonectx);
811 public override void Emit (EmitContext ec)
816 LoadFromPtr (ec.ig, Type);
819 public void Emit (EmitContext ec, bool leave_copy)
823 ec.ig.Emit (OpCodes.Dup);
824 temporary = new LocalTemporary (expr.Type);
825 temporary.Store (ec);
829 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
831 prepared = prepare_for_load;
835 if (prepare_for_load)
836 ec.ig.Emit (OpCodes.Dup);
840 ec.ig.Emit (OpCodes.Dup);
841 temporary = new LocalTemporary (expr.Type);
842 temporary.Store (ec);
845 StoreFromPtr (ec.ig, type);
847 if (temporary != null) {
849 temporary.Release (ec);
853 public void AddressOf (EmitContext ec, AddressOp Mode)
858 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
860 return DoResolve (ec);
863 protected override Expression DoResolve (ResolveContext ec)
865 expr = expr.Resolve (ec);
870 UnsafeError (ec, loc);
872 if (!expr.Type.IsPointer) {
873 ec.Report.Error (193, loc, "The * or -> operator must be applied to a pointer");
877 if (expr.Type == TypeManager.void_ptr_type) {
878 ec.Report.Error (242, loc, "The operation in question is undefined on void pointers");
882 type = TypeManager.GetElementType (expr.Type);
883 eclass = ExprClass.Variable;
887 public bool IsFixed {
891 public override string ToString ()
893 return "*(" + expr + ")";
898 /// Unary Mutator expressions (pre and post ++ and --)
902 /// UnaryMutator implements ++ and -- expressions. It derives from
903 /// ExpressionStatement becuase the pre/post increment/decrement
904 /// operators can be used in a statement context.
906 /// FIXME: Idea, we could split this up in two classes, one simpler
907 /// for the common case, and one with the extra fields for more complex
908 /// classes (indexers require temporary access; overloaded require method)
911 public class UnaryMutator : ExpressionStatement
913 class DynamicPostMutator : Expression, IAssignMethod
918 public DynamicPostMutator (Expression expr)
921 this.type = expr.Type;
922 this.loc = expr.Location;
925 public override Expression CreateExpressionTree (ResolveContext ec)
927 throw new NotImplementedException ("ET");
930 protected override Expression DoResolve (ResolveContext rc)
932 eclass = expr.eclass;
936 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
938 expr.DoResolveLValue (ec, right_side);
939 return DoResolve (ec);
942 public override void Emit (EmitContext ec)
947 public void Emit (EmitContext ec, bool leave_copy)
949 throw new NotImplementedException ();
953 // Emits target assignment using unmodified source value
955 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
958 // Allocate temporary variable to keep original value before it's modified
960 temp = new LocalTemporary (type);
964 ((IAssignMethod) expr).EmitAssign (ec, source, false, prepare_for_load);
975 public enum Mode : byte {
982 PreDecrement = IsDecrement,
983 PostIncrement = IsPost,
984 PostDecrement = IsPost | IsDecrement
988 bool is_expr, recurse;
992 // Holds the real operation
993 Expression operation;
995 public UnaryMutator (Mode m, Expression e)
1002 public override Expression CreateExpressionTree (ResolveContext ec)
1004 return new SimpleAssign (this, this).CreateExpressionTree (ec);
1007 protected override Expression DoResolve (ResolveContext ec)
1009 expr = expr.Resolve (ec);
1014 if (TypeManager.IsDynamicType (expr.Type)) {
1016 // Handle postfix unary operators using local
1017 // temporary variable
1019 if ((mode & Mode.IsPost) != 0)
1020 expr = new DynamicPostMutator (expr);
1022 Arguments args = new Arguments (1);
1023 args.Add (new Argument (expr));
1024 return new SimpleAssign (expr, new DynamicUnaryConversion (GetOperatorExpressionTypeName (), args, loc)).Resolve (ec);
1027 if (TypeManager.IsNullableType (expr.Type))
1028 return new Nullable.LiftedUnaryMutator (mode, expr, loc).Resolve (ec);
1030 eclass = ExprClass.Value;
1032 return ResolveOperator (ec);
1035 void EmitCode (EmitContext ec, bool is_expr)
1038 this.is_expr = is_expr;
1039 ((IAssignMethod) expr).EmitAssign (ec, this, is_expr && (mode == Mode.PreIncrement || mode == Mode.PreDecrement), true);
1042 public override void Emit (EmitContext ec)
1045 // We use recurse to allow ourselfs to be the source
1046 // of an assignment. This little hack prevents us from
1047 // having to allocate another expression
1050 ((IAssignMethod) expr).Emit (ec, is_expr && (mode == Mode.PostIncrement || mode == Mode.PostDecrement));
1052 operation.Emit (ec);
1058 EmitCode (ec, true);
1061 public override void EmitStatement (EmitContext ec)
1063 EmitCode (ec, false);
1067 // Converts operator to System.Linq.Expressions.ExpressionType enum name
1069 string GetOperatorExpressionTypeName ()
1071 return IsDecrement ? "Decrement" : "Increment";
1075 get { return (mode & Mode.IsDecrement) != 0; }
1079 // Returns whether an object of type `t' can be incremented
1080 // or decremented with add/sub (ie, basically whether we can
1081 // use pre-post incr-decr operations on it, but it is not a
1082 // System.Decimal, which we require operator overloading to catch)
1084 static bool IsPredefinedOperator (Type t)
1086 return (TypeManager.IsPrimitiveType (t) && t != TypeManager.bool_type) ||
1087 TypeManager.IsEnumType (t) ||
1088 t.IsPointer && t != TypeManager.void_ptr_type;
1092 public override SLE.Expression MakeExpression (BuilderContext ctx)
1094 var target = ((RuntimeValueExpression) expr).MetaObject.Expression;
1095 var source = SLE.Expression.Convert (operation.MakeExpression (ctx), target.Type);
1096 return SLE.Expression.Assign (target, source);
1100 protected override void CloneTo (CloneContext clonectx, Expression t)
1102 UnaryMutator target = (UnaryMutator) t;
1104 target.expr = expr.Clone (clonectx);
1107 Expression ResolveOperator (ResolveContext ec)
1109 if (expr is RuntimeValueExpression) {
1112 // Use itself at the top of the stack
1113 operation = new EmptyExpression (type);
1117 // The operand of the prefix/postfix increment decrement operators
1118 // should be an expression that is classified as a variable,
1119 // a property access or an indexer access
1121 if (expr.eclass == ExprClass.Variable || expr.eclass == ExprClass.IndexerAccess || expr.eclass == ExprClass.PropertyAccess) {
1122 expr = expr.ResolveLValue (ec, expr);
1124 ec.Report.Error (1059, loc, "The operand of an increment or decrement operator must be a variable, property or indexer");
1128 // 1. Check predefined types
1130 if (IsPredefinedOperator (type)) {
1131 // TODO: Move to IntConstant once I get rid of int32_type
1132 var one = new IntConstant (1, loc);
1134 // TODO: Cache this based on type when using EmptyExpression in
1136 Binary.Operator op = IsDecrement ? Binary.Operator.Subtraction : Binary.Operator.Addition;
1137 operation = new Binary (op, operation, one);
1138 operation = operation.Resolve (ec);
1139 if (operation != null && operation.Type != type)
1140 operation = Convert.ExplicitNumericConversion (operation, type);
1146 // Step 2: Perform Operator Overload location
1152 op_name = Operator.GetMetadataName (Operator.OpType.Decrement);
1154 op_name = Operator.GetMetadataName (Operator.OpType.Increment);
1156 mg = MemberLookup (ec.Compiler, ec.CurrentType, type, op_name, MemberTypes.Method, AllBindingFlags, loc) as MethodGroupExpr;
1159 Arguments args = new Arguments (1);
1160 args.Add (new Argument (expr));
1161 mg = mg.OverloadResolve (ec, ref args, false, loc);
1165 args[0].Expr = operation;
1166 operation = new UserOperatorCall (mg, args, null, loc);
1167 operation = Convert.ImplicitConversionRequired (ec, operation, type, loc);
1171 string name = IsDecrement ?
1172 Operator.GetName (Operator.OpType.Decrement) :
1173 Operator.GetName (Operator.OpType.Increment);
1175 Unary.Error_OperatorCannotBeApplied (ec, loc, name, type);
1181 /// Base class for the `Is' and `As' classes.
1185 /// FIXME: Split this in two, and we get to save the `Operator' Oper
1188 public abstract class Probe : Expression {
1189 public Expression ProbeType;
1190 protected Expression expr;
1191 protected TypeExpr probe_type_expr;
1193 public Probe (Expression expr, Expression probe_type, Location l)
1195 ProbeType = probe_type;
1200 public Expression Expr {
1206 protected override Expression DoResolve (ResolveContext ec)
1208 probe_type_expr = ProbeType.ResolveAsTypeTerminal (ec, false);
1209 if (probe_type_expr == null)
1212 expr = expr.Resolve (ec);
1216 if ((probe_type_expr.Type.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
1217 ec.Report.Error (-244, loc, "The `{0}' operator cannot be applied to an operand of a static type",
1221 if (expr.Type.IsPointer || probe_type_expr.Type.IsPointer) {
1222 ec.Report.Error (244, loc, "The `{0}' operator cannot be applied to an operand of pointer type",
1227 if (expr.Type == InternalType.AnonymousMethod) {
1228 ec.Report.Error (837, loc, "The `{0}' operator cannot be applied to a lambda expression or anonymous method",
1236 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
1238 expr.MutateHoistedGenericType (storey);
1239 probe_type_expr.MutateHoistedGenericType (storey);
1242 protected abstract string OperatorName { get; }
1244 protected override void CloneTo (CloneContext clonectx, Expression t)
1246 Probe target = (Probe) t;
1248 target.expr = expr.Clone (clonectx);
1249 target.ProbeType = ProbeType.Clone (clonectx);
1255 /// Implementation of the `is' operator.
1257 public class Is : Probe {
1258 Nullable.Unwrap expr_unwrap;
1260 public Is (Expression expr, Expression probe_type, Location l)
1261 : base (expr, probe_type, l)
1265 public override Expression CreateExpressionTree (ResolveContext ec)
1267 Arguments args = Arguments.CreateForExpressionTree (ec, null,
1268 expr.CreateExpressionTree (ec),
1269 new TypeOf (probe_type_expr, loc));
1271 return CreateExpressionFactoryCall (ec, "TypeIs", args);
1274 public override void Emit (EmitContext ec)
1276 ILGenerator ig = ec.ig;
1277 if (expr_unwrap != null) {
1278 expr_unwrap.EmitCheck (ec);
1283 ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
1284 ig.Emit (OpCodes.Ldnull);
1285 ig.Emit (OpCodes.Cgt_Un);
1288 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
1290 ILGenerator ig = ec.ig;
1291 if (expr_unwrap != null) {
1292 expr_unwrap.EmitCheck (ec);
1295 ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
1297 ig.Emit (on_true ? OpCodes.Brtrue : OpCodes.Brfalse, target);
1300 Expression CreateConstantResult (ResolveContext ec, bool result)
1303 ec.Report.Warning (183, 1, loc, "The given expression is always of the provided (`{0}') type",
1304 TypeManager.CSharpName (probe_type_expr.Type));
1306 ec.Report.Warning (184, 1, loc, "The given expression is never of the provided (`{0}') type",
1307 TypeManager.CSharpName (probe_type_expr.Type));
1309 return ReducedExpression.Create (new BoolConstant (result, loc).Resolve (ec), this);
1312 protected override Expression DoResolve (ResolveContext ec)
1314 if (base.DoResolve (ec) == null)
1318 bool d_is_nullable = false;
1321 // If E is a method group or the null literal, or if the type of E is a reference
1322 // type or a nullable type and the value of E is null, the result is false
1324 if (expr.IsNull || expr.eclass == ExprClass.MethodGroup)
1325 return CreateConstantResult (ec, false);
1327 if (TypeManager.IsNullableType (d) && !TypeManager.ContainsGenericParameters (d)) {
1328 d = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (d) [0]);
1329 d_is_nullable = true;
1332 type = TypeManager.bool_type;
1333 eclass = ExprClass.Value;
1334 Type t = probe_type_expr.Type;
1335 bool t_is_nullable = false;
1336 if (TypeManager.IsNullableType (t) && !TypeManager.ContainsGenericParameters (t)) {
1337 t = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (t) [0]);
1338 t_is_nullable = true;
1341 if (TypeManager.IsStruct (t)) {
1344 // D and T are the same value types but D can be null
1346 if (d_is_nullable && !t_is_nullable) {
1347 expr_unwrap = Nullable.Unwrap.Create (expr, false);
1352 // The result is true if D and T are the same value types
1354 return CreateConstantResult (ec, true);
1357 if (TypeManager.IsGenericParameter (d))
1358 return ResolveGenericParameter (ec, t, d);
1361 // An unboxing conversion exists
1363 if (Convert.ExplicitReferenceConversionExists (d, t))
1366 if (TypeManager.IsGenericParameter (t))
1367 return ResolveGenericParameter (ec, d, t);
1369 if (TypeManager.IsStruct (d)) {
1371 if (Convert.ImplicitBoxingConversionExists (expr, t, out temp))
1372 return CreateConstantResult (ec, true);
1374 if (TypeManager.IsGenericParameter (d))
1375 return ResolveGenericParameter (ec, t, d);
1377 if (TypeManager.ContainsGenericParameters (d))
1380 if (Convert.ImplicitReferenceConversionExists (expr, t) ||
1381 Convert.ExplicitReferenceConversionExists (d, t)) {
1387 return CreateConstantResult (ec, false);
1390 Expression ResolveGenericParameter (ResolveContext ec, Type d, Type t)
1392 GenericConstraints constraints = TypeManager.GetTypeParameterConstraints (t);
1393 if (constraints != null) {
1394 if (constraints.IsReferenceType && TypeManager.IsStruct (d))
1395 return CreateConstantResult (ec, false);
1398 if (TypeManager.IsGenericParameter (expr.Type)) {
1399 if (constraints != null && constraints.IsValueType && expr.Type == t)
1400 return CreateConstantResult (ec, true);
1402 expr = new BoxedCast (expr, d);
1408 protected override string OperatorName {
1409 get { return "is"; }
1414 /// Implementation of the `as' operator.
1416 public class As : Probe {
1418 Expression resolved_type;
1420 public As (Expression expr, Expression probe_type, Location l)
1421 : base (expr, probe_type, l)
1425 public override Expression CreateExpressionTree (ResolveContext ec)
1427 Arguments args = Arguments.CreateForExpressionTree (ec, null,
1428 expr.CreateExpressionTree (ec),
1429 new TypeOf (probe_type_expr, loc));
1431 return CreateExpressionFactoryCall (ec, "TypeAs", args);
1434 public override void Emit (EmitContext ec)
1436 ILGenerator ig = ec.ig;
1441 ig.Emit (OpCodes.Isinst, type);
1443 if (TypeManager.IsGenericParameter (type) || TypeManager.IsNullableType (type))
1444 ig.Emit (OpCodes.Unbox_Any, type);
1447 protected override Expression DoResolve (ResolveContext ec)
1449 if (resolved_type == null) {
1450 resolved_type = base.DoResolve (ec);
1452 if (resolved_type == null)
1456 type = probe_type_expr.Type;
1457 eclass = ExprClass.Value;
1458 Type etype = expr.Type;
1460 if (!TypeManager.IsReferenceType (type) && !TypeManager.IsNullableType (type)) {
1461 if (TypeManager.IsGenericParameter (type)) {
1462 ec.Report.Error (413, loc,
1463 "The `as' operator cannot be used with a non-reference type parameter `{0}'. Consider adding `class' or a reference type constraint",
1464 probe_type_expr.GetSignatureForError ());
1466 ec.Report.Error (77, loc,
1467 "The `as' operator cannot be used with a non-nullable value type `{0}'",
1468 TypeManager.CSharpName (type));
1473 if (expr.IsNull && TypeManager.IsNullableType (type)) {
1474 return Nullable.LiftedNull.CreateFromExpression (ec, this);
1477 Expression e = Convert.ImplicitConversion (ec, expr, type, loc);
1484 if (Convert.ExplicitReferenceConversionExists (etype, type)){
1485 if (TypeManager.IsGenericParameter (etype))
1486 expr = new BoxedCast (expr, etype);
1492 if (TypeManager.ContainsGenericParameters (etype) ||
1493 TypeManager.ContainsGenericParameters (type)) {
1494 expr = new BoxedCast (expr, etype);
1499 ec.Report.Error (39, loc, "Cannot convert type `{0}' to `{1}' via a built-in conversion",
1500 TypeManager.CSharpName (etype), TypeManager.CSharpName (type));
1505 protected override string OperatorName {
1506 get { return "as"; }
1509 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
1511 type = storey.MutateType (type);
1512 base.MutateHoistedGenericType (storey);
1515 public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
1517 return expr.GetAttributableValue (ec, value_type, out value);
1522 /// This represents a typecast in the source language.
1524 /// FIXME: Cast expressions have an unusual set of parsing
1525 /// rules, we need to figure those out.
1527 public class Cast : ShimExpression {
1528 Expression target_type;
1530 public Cast (Expression cast_type, Expression expr)
1531 : this (cast_type, expr, cast_type.Location)
1535 public Cast (Expression cast_type, Expression expr, Location loc)
1538 this.target_type = cast_type;
1542 public Expression TargetType {
1543 get { return target_type; }
1546 protected override Expression DoResolve (ResolveContext ec)
1548 expr = expr.Resolve (ec);
1552 TypeExpr target = target_type.ResolveAsTypeTerminal (ec, false);
1558 if (type.IsAbstract && type.IsSealed) {
1559 ec.Report.Error (716, loc, "Cannot convert to static type `{0}'", TypeManager.CSharpName (type));
1563 eclass = ExprClass.Value;
1565 Constant c = expr as Constant;
1567 c = c.TryReduce (ec, type, loc);
1572 if (type.IsPointer && !ec.IsUnsafe) {
1573 UnsafeError (ec, loc);
1574 } else if (TypeManager.IsDynamicType (expr.Type)) {
1575 Arguments arg = new Arguments (1);
1576 arg.Add (new Argument (expr));
1577 return new DynamicConversion (type, CSharpBinderFlags.ConvertExplicit, arg, loc).Resolve (ec);
1580 expr = Convert.ExplicitConversion (ec, expr, type, loc);
1584 protected override void CloneTo (CloneContext clonectx, Expression t)
1586 Cast target = (Cast) t;
1588 target.target_type = target_type.Clone (clonectx);
1589 target.expr = expr.Clone (clonectx);
1593 public class ImplicitCast : ShimExpression
1597 public ImplicitCast (Expression expr, Type target, bool arrayAccess)
1600 this.loc = expr.Location;
1602 this.arrayAccess = arrayAccess;
1605 protected override Expression DoResolve (ResolveContext ec)
1607 expr = expr.Resolve (ec);
1612 expr = ConvertExpressionToArrayIndex (ec, expr);
1614 expr = Convert.ImplicitConversionRequired (ec, expr, type, loc);
1621 // C# 2.0 Default value expression
1623 public class DefaultValueExpression : Expression
1627 public DefaultValueExpression (Expression expr, Location loc)
1633 public override Expression CreateExpressionTree (ResolveContext ec)
1635 Arguments args = new Arguments (2);
1636 args.Add (new Argument (this));
1637 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
1638 return CreateExpressionFactoryCall (ec, "Constant", args);
1641 protected override Expression DoResolve (ResolveContext ec)
1643 TypeExpr texpr = expr.ResolveAsTypeTerminal (ec, false);
1649 if ((type.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
1650 ec.Report.Error (-244, loc, "The `default value' operator cannot be applied to an operand of a static type");
1654 return new NullLiteral (Location).ConvertImplicitly (ec, type);
1656 if (TypeManager.IsReferenceType (type))
1657 return new NullConstant (type, loc);
1659 Constant c = New.Constantify (type);
1661 return c.Resolve (ec);
1663 eclass = ExprClass.Variable;
1667 public override void Emit (EmitContext ec)
1669 LocalTemporary temp_storage = new LocalTemporary(type);
1671 temp_storage.AddressOf(ec, AddressOp.LoadStore);
1672 ec.ig.Emit(OpCodes.Initobj, type);
1673 temp_storage.Emit(ec);
1676 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
1678 type = storey.MutateType (type);
1681 protected override void CloneTo (CloneContext clonectx, Expression t)
1683 DefaultValueExpression target = (DefaultValueExpression) t;
1685 target.expr = expr.Clone (clonectx);
1690 /// Binary operators
1692 public class Binary : Expression, IDynamicBinder
1695 protected class PredefinedOperator {
1696 protected readonly Type left;
1697 protected readonly Type right;
1698 public readonly Operator OperatorsMask;
1699 public Type ReturnType;
1701 public PredefinedOperator (Type ltype, Type rtype, Operator op_mask)
1702 : this (ltype, rtype, op_mask, ltype)
1706 public PredefinedOperator (Type type, Operator op_mask, Type return_type)
1707 : this (type, type, op_mask, return_type)
1711 public PredefinedOperator (Type type, Operator op_mask)
1712 : this (type, type, op_mask, type)
1716 public PredefinedOperator (Type ltype, Type rtype, Operator op_mask, Type return_type)
1718 if ((op_mask & Operator.ValuesOnlyMask) != 0)
1719 throw new InternalErrorException ("Only masked values can be used");
1723 this.OperatorsMask = op_mask;
1724 this.ReturnType = return_type;
1727 public virtual Expression ConvertResult (ResolveContext ec, Binary b)
1729 b.type = ReturnType;
1731 b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
1732 b.right = Convert.ImplicitConversion (ec, b.right, right, b.right.Location);
1735 // A user operators does not support multiple user conversions, but decimal type
1736 // is considered to be predefined type therefore we apply predefined operators rules
1737 // and then look for decimal user-operator implementation
1739 if (left == TypeManager.decimal_type)
1740 return b.ResolveUserOperator (ec, b.left.Type, b.right.Type);
1742 var c = b.right as IntegralConstant;
1744 if (c.IsDefaultValue && (b.oper == Operator.Addition || b.oper == Operator.BitwiseOr || b.oper == Operator.Subtraction))
1745 return ReducedExpression.Create (b.left, b);
1749 c = b.left as IntegralConstant;
1751 if (c.IsDefaultValue && (b.oper == Operator.Addition || b.oper == Operator.BitwiseOr))
1752 return ReducedExpression.Create (b.right, b);
1759 public bool IsPrimitiveApplicable (Type ltype, Type rtype)
1762 // We are dealing with primitive types only
1764 return left == ltype && ltype == rtype;
1767 public virtual bool IsApplicable (ResolveContext ec, Expression lexpr, Expression rexpr)
1769 if (TypeManager.IsEqual (left, lexpr.Type) &&
1770 TypeManager.IsEqual (right, rexpr.Type))
1773 return Convert.ImplicitConversionExists (ec, lexpr, left) &&
1774 Convert.ImplicitConversionExists (ec, rexpr, right);
1777 public PredefinedOperator ResolveBetterOperator (ResolveContext ec, PredefinedOperator best_operator)
1780 if (left != null && best_operator.left != null) {
1781 result = MethodGroupExpr.BetterTypeConversion (ec, best_operator.left, left);
1785 // When second arguments are same as the first one, the result is same
1787 if (right != null && (left != right || best_operator.left != best_operator.right)) {
1788 result |= MethodGroupExpr.BetterTypeConversion (ec, best_operator.right, right);
1791 if (result == 0 || result > 2)
1794 return result == 1 ? best_operator : this;
1798 class PredefinedStringOperator : PredefinedOperator {
1799 public PredefinedStringOperator (Type type, Operator op_mask)
1800 : base (type, op_mask, type)
1802 ReturnType = TypeManager.string_type;
1805 public PredefinedStringOperator (Type ltype, Type rtype, Operator op_mask)
1806 : base (ltype, rtype, op_mask)
1808 ReturnType = TypeManager.string_type;
1811 public override Expression ConvertResult (ResolveContext ec, Binary b)
1814 // Use original expression for nullable arguments
1816 Nullable.Unwrap unwrap = b.left as Nullable.Unwrap;
1818 b.left = unwrap.Original;
1820 unwrap = b.right as Nullable.Unwrap;
1822 b.right = unwrap.Original;
1824 b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
1825 b.right = Convert.ImplicitConversion (ec, b.right, right, b.right.Location);
1828 // Start a new concat expression using converted expression
1830 return StringConcat.Create (ec, b.left, b.right, b.loc);
1834 class PredefinedShiftOperator : PredefinedOperator {
1835 public PredefinedShiftOperator (Type ltype, Operator op_mask) :
1836 base (ltype, TypeManager.int32_type, op_mask)
1840 public override Expression ConvertResult (ResolveContext ec, Binary b)
1842 b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
1844 Expression expr_tree_expr = Convert.ImplicitConversion (ec, b.right, TypeManager.int32_type, b.right.Location);
1846 int right_mask = left == TypeManager.int32_type || left == TypeManager.uint32_type ? 0x1f : 0x3f;
1849 // b = b.left >> b.right & (0x1f|0x3f)
1851 b.right = new Binary (Operator.BitwiseAnd,
1852 b.right, new IntConstant (right_mask, b.right.Location)).Resolve (ec);
1855 // Expression tree representation does not use & mask
1857 b.right = ReducedExpression.Create (b.right, expr_tree_expr).Resolve (ec);
1858 b.type = ReturnType;
1861 // Optimize shift by 0
1863 var c = b.right as Constant;
1864 if (c != null && c.IsDefaultValue)
1865 return ReducedExpression.Create (b.left, b).Resolve (ec);
1871 class PredefinedPointerOperator : PredefinedOperator {
1872 public PredefinedPointerOperator (Type ltype, Type rtype, Operator op_mask)
1873 : base (ltype, rtype, op_mask)
1877 public PredefinedPointerOperator (Type ltype, Type rtype, Operator op_mask, Type retType)
1878 : base (ltype, rtype, op_mask, retType)
1882 public PredefinedPointerOperator (Type type, Operator op_mask, Type return_type)
1883 : base (type, op_mask, return_type)
1887 public override bool IsApplicable (ResolveContext ec, Expression lexpr, Expression rexpr)
1890 if (!lexpr.Type.IsPointer)
1893 if (!Convert.ImplicitConversionExists (ec, lexpr, left))
1897 if (right == null) {
1898 if (!rexpr.Type.IsPointer)
1901 if (!Convert.ImplicitConversionExists (ec, rexpr, right))
1908 public override Expression ConvertResult (ResolveContext ec, Binary b)
1911 b.left = EmptyCast.Create (b.left, left);
1912 } else if (right != null) {
1913 b.right = EmptyCast.Create (b.right, right);
1916 Type r_type = ReturnType;
1917 Expression left_arg, right_arg;
1918 if (r_type == null) {
1921 right_arg = b.right;
1922 r_type = b.left.Type;
1926 r_type = b.right.Type;
1930 right_arg = b.right;
1933 return new PointerArithmetic (b.oper, left_arg, right_arg, r_type, b.loc).Resolve (ec);
1938 public enum Operator {
1939 Multiply = 0 | ArithmeticMask,
1940 Division = 1 | ArithmeticMask,
1941 Modulus = 2 | ArithmeticMask,
1942 Addition = 3 | ArithmeticMask | AdditionMask,
1943 Subtraction = 4 | ArithmeticMask | SubtractionMask,
1945 LeftShift = 5 | ShiftMask,
1946 RightShift = 6 | ShiftMask,
1948 LessThan = 7 | ComparisonMask | RelationalMask,
1949 GreaterThan = 8 | ComparisonMask | RelationalMask,
1950 LessThanOrEqual = 9 | ComparisonMask | RelationalMask,
1951 GreaterThanOrEqual = 10 | ComparisonMask | RelationalMask,
1952 Equality = 11 | ComparisonMask | EqualityMask,
1953 Inequality = 12 | ComparisonMask | EqualityMask,
1955 BitwiseAnd = 13 | BitwiseMask,
1956 ExclusiveOr = 14 | BitwiseMask,
1957 BitwiseOr = 15 | BitwiseMask,
1959 LogicalAnd = 16 | LogicalMask,
1960 LogicalOr = 17 | LogicalMask,
1965 ValuesOnlyMask = ArithmeticMask - 1,
1966 ArithmeticMask = 1 << 5,
1968 ComparisonMask = 1 << 7,
1969 EqualityMask = 1 << 8,
1970 BitwiseMask = 1 << 9,
1971 LogicalMask = 1 << 10,
1972 AdditionMask = 1 << 11,
1973 SubtractionMask = 1 << 12,
1974 RelationalMask = 1 << 13
1977 readonly Operator oper;
1978 protected Expression left, right;
1979 readonly bool is_compound;
1980 Expression enum_conversion;
1982 static PredefinedOperator [] standard_operators;
1983 static PredefinedOperator [] pointer_operators;
1985 public Binary (Operator oper, Expression left, Expression right, bool isCompound)
1986 : this (oper, left, right)
1988 this.is_compound = isCompound;
1991 public Binary (Operator oper, Expression left, Expression right)
1996 this.loc = left.Location;
1999 public Operator Oper {
2006 /// Returns a stringified representation of the Operator
2008 string OperName (Operator oper)
2012 case Operator.Multiply:
2015 case Operator.Division:
2018 case Operator.Modulus:
2021 case Operator.Addition:
2024 case Operator.Subtraction:
2027 case Operator.LeftShift:
2030 case Operator.RightShift:
2033 case Operator.LessThan:
2036 case Operator.GreaterThan:
2039 case Operator.LessThanOrEqual:
2042 case Operator.GreaterThanOrEqual:
2045 case Operator.Equality:
2048 case Operator.Inequality:
2051 case Operator.BitwiseAnd:
2054 case Operator.BitwiseOr:
2057 case Operator.ExclusiveOr:
2060 case Operator.LogicalOr:
2063 case Operator.LogicalAnd:
2067 s = oper.ToString ();
2077 public static void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right, Operator oper, Location loc)
2079 new Binary (oper, left, right).Error_OperatorCannotBeApplied (ec, left, right);
2082 public static void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right, string oper, Location loc)
2085 l = TypeManager.CSharpName (left.Type);
2086 r = TypeManager.CSharpName (right.Type);
2088 ec.Report.Error (19, loc, "Operator `{0}' cannot be applied to operands of type `{1}' and `{2}'",
2092 protected void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right)
2094 Error_OperatorCannotBeApplied (ec, left, right, OperName (oper), loc);
2098 // Converts operator to System.Linq.Expressions.ExpressionType enum name
2100 string GetOperatorExpressionTypeName ()
2103 case Operator.Addition:
2104 return is_compound ? "AddAssign" : "Add";
2105 case Operator.BitwiseAnd:
2106 return is_compound ? "AndAssign" : "And";
2107 case Operator.BitwiseOr:
2108 return is_compound ? "OrAssign" : "Or";
2109 case Operator.Division:
2110 return is_compound ? "DivideAssign" : "Divide";
2111 case Operator.ExclusiveOr:
2112 return is_compound ? "ExclusiveOrAssign" : "ExclusiveOr";
2113 case Operator.Equality:
2115 case Operator.GreaterThan:
2116 return "GreaterThan";
2117 case Operator.GreaterThanOrEqual:
2118 return "GreaterThanOrEqual";
2119 case Operator.Inequality:
2121 case Operator.LeftShift:
2122 return is_compound ? "LeftShiftAssign" : "LeftShift";
2123 case Operator.LessThan:
2125 case Operator.LessThanOrEqual:
2126 return "LessThanOrEqual";
2127 case Operator.LogicalAnd:
2129 case Operator.LogicalOr:
2131 case Operator.Modulus:
2132 return is_compound ? "ModuloAssign" : "Modulo";
2133 case Operator.Multiply:
2134 return is_compound ? "MultiplyAssign" : "Multiply";
2135 case Operator.RightShift:
2136 return is_compound ? "RightShiftAssign" : "RightShift";
2137 case Operator.Subtraction:
2138 return is_compound ? "SubtractAssign" : "Subtract";
2140 throw new NotImplementedException ("Unknown expression type operator " + oper.ToString ());
2144 static string GetOperatorMetadataName (Operator op)
2146 CSharp.Operator.OpType op_type;
2148 case Operator.Addition:
2149 op_type = CSharp.Operator.OpType.Addition; break;
2150 case Operator.BitwiseAnd:
2151 op_type = CSharp.Operator.OpType.BitwiseAnd; break;
2152 case Operator.BitwiseOr:
2153 op_type = CSharp.Operator.OpType.BitwiseOr; break;
2154 case Operator.Division:
2155 op_type = CSharp.Operator.OpType.Division; break;
2156 case Operator.Equality:
2157 op_type = CSharp.Operator.OpType.Equality; break;
2158 case Operator.ExclusiveOr:
2159 op_type = CSharp.Operator.OpType.ExclusiveOr; break;
2160 case Operator.GreaterThan:
2161 op_type = CSharp.Operator.OpType.GreaterThan; break;
2162 case Operator.GreaterThanOrEqual:
2163 op_type = CSharp.Operator.OpType.GreaterThanOrEqual; break;
2164 case Operator.Inequality:
2165 op_type = CSharp.Operator.OpType.Inequality; break;
2166 case Operator.LeftShift:
2167 op_type = CSharp.Operator.OpType.LeftShift; break;
2168 case Operator.LessThan:
2169 op_type = CSharp.Operator.OpType.LessThan; break;
2170 case Operator.LessThanOrEqual:
2171 op_type = CSharp.Operator.OpType.LessThanOrEqual; break;
2172 case Operator.Modulus:
2173 op_type = CSharp.Operator.OpType.Modulus; break;
2174 case Operator.Multiply:
2175 op_type = CSharp.Operator.OpType.Multiply; break;
2176 case Operator.RightShift:
2177 op_type = CSharp.Operator.OpType.RightShift; break;
2178 case Operator.Subtraction:
2179 op_type = CSharp.Operator.OpType.Subtraction; break;
2181 throw new InternalErrorException (op.ToString ());
2184 return CSharp.Operator.GetMetadataName (op_type);
2187 public static void EmitOperatorOpcode (EmitContext ec, Operator oper, Type l)
2190 ILGenerator ig = ec.ig;
2193 case Operator.Multiply:
2194 if (ec.HasSet (EmitContext.Options.CheckedScope)) {
2195 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2196 opcode = OpCodes.Mul_Ovf;
2197 else if (!IsFloat (l))
2198 opcode = OpCodes.Mul_Ovf_Un;
2200 opcode = OpCodes.Mul;
2202 opcode = OpCodes.Mul;
2206 case Operator.Division:
2208 opcode = OpCodes.Div_Un;
2210 opcode = OpCodes.Div;
2213 case Operator.Modulus:
2215 opcode = OpCodes.Rem_Un;
2217 opcode = OpCodes.Rem;
2220 case Operator.Addition:
2221 if (ec.HasSet (EmitContext.Options.CheckedScope)) {
2222 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2223 opcode = OpCodes.Add_Ovf;
2224 else if (!IsFloat (l))
2225 opcode = OpCodes.Add_Ovf_Un;
2227 opcode = OpCodes.Add;
2229 opcode = OpCodes.Add;
2232 case Operator.Subtraction:
2233 if (ec.HasSet (EmitContext.Options.CheckedScope)) {
2234 if (l == TypeManager.int32_type || l == TypeManager.int64_type)
2235 opcode = OpCodes.Sub_Ovf;
2236 else if (!IsFloat (l))
2237 opcode = OpCodes.Sub_Ovf_Un;
2239 opcode = OpCodes.Sub;
2241 opcode = OpCodes.Sub;
2244 case Operator.RightShift:
2246 opcode = OpCodes.Shr_Un;
2248 opcode = OpCodes.Shr;
2251 case Operator.LeftShift:
2252 opcode = OpCodes.Shl;
2255 case Operator.Equality:
2256 opcode = OpCodes.Ceq;
2259 case Operator.Inequality:
2260 ig.Emit (OpCodes.Ceq);
2261 ig.Emit (OpCodes.Ldc_I4_0);
2263 opcode = OpCodes.Ceq;
2266 case Operator.LessThan:
2268 opcode = OpCodes.Clt_Un;
2270 opcode = OpCodes.Clt;
2273 case Operator.GreaterThan:
2275 opcode = OpCodes.Cgt_Un;
2277 opcode = OpCodes.Cgt;
2280 case Operator.LessThanOrEqual:
2281 if (IsUnsigned (l) || IsFloat (l))
2282 ig.Emit (OpCodes.Cgt_Un);
2284 ig.Emit (OpCodes.Cgt);
2285 ig.Emit (OpCodes.Ldc_I4_0);
2287 opcode = OpCodes.Ceq;
2290 case Operator.GreaterThanOrEqual:
2291 if (IsUnsigned (l) || IsFloat (l))
2292 ig.Emit (OpCodes.Clt_Un);
2294 ig.Emit (OpCodes.Clt);
2296 ig.Emit (OpCodes.Ldc_I4_0);
2298 opcode = OpCodes.Ceq;
2301 case Operator.BitwiseOr:
2302 opcode = OpCodes.Or;
2305 case Operator.BitwiseAnd:
2306 opcode = OpCodes.And;
2309 case Operator.ExclusiveOr:
2310 opcode = OpCodes.Xor;
2314 throw new InternalErrorException (oper.ToString ());
2320 static bool IsUnsigned (Type t)
2325 return (t == TypeManager.uint32_type || t == TypeManager.uint64_type ||
2326 t == TypeManager.ushort_type || t == TypeManager.byte_type);
2329 static bool IsFloat (Type t)
2331 return t == TypeManager.float_type || t == TypeManager.double_type;
2334 Expression ResolveOperator (ResolveContext ec)
2337 Type r = right.Type;
2339 bool primitives_only = false;
2341 if (standard_operators == null)
2342 CreateStandardOperatorsTable ();
2345 // Handles predefined primitive types
2347 if (TypeManager.IsPrimitiveType (l) && TypeManager.IsPrimitiveType (r)) {
2348 if ((oper & Operator.ShiftMask) == 0) {
2349 if (l != TypeManager.bool_type && !DoBinaryOperatorPromotion (ec))
2352 primitives_only = true;
2356 if (l.IsPointer || r.IsPointer)
2357 return ResolveOperatorPointer (ec, l, r);
2360 bool lenum = TypeManager.IsEnumType (l);
2361 bool renum = TypeManager.IsEnumType (r);
2362 if (lenum || renum) {
2363 expr = ResolveOperatorEnum (ec, lenum, renum, l, r);
2365 // TODO: Can this be ambiguous
2371 if ((oper == Operator.Addition || oper == Operator.Subtraction || (oper & Operator.EqualityMask) != 0) &&
2372 (TypeManager.IsDelegateType (l) || TypeManager.IsDelegateType (r))) {
2374 expr = ResolveOperatorDelegate (ec, l, r);
2376 // TODO: Can this be ambiguous
2382 expr = ResolveUserOperator (ec, l, r);
2386 // Predefined reference types equality
2387 if ((oper & Operator.EqualityMask) != 0) {
2388 expr = ResolveOperatorEqualityRerefence (ec, l, r);
2394 return ResolveOperatorPredefined (ec, standard_operators, primitives_only, null);
2397 // at least one of 'left' or 'right' is an enumeration constant (EnumConstant or SideEffectConstant or ...)
2398 // if 'left' is not an enumeration constant, create one from the type of 'right'
2399 Constant EnumLiftUp (ResolveContext ec, Constant left, Constant right, Location loc)
2402 case Operator.BitwiseOr:
2403 case Operator.BitwiseAnd:
2404 case Operator.ExclusiveOr:
2405 case Operator.Equality:
2406 case Operator.Inequality:
2407 case Operator.LessThan:
2408 case Operator.LessThanOrEqual:
2409 case Operator.GreaterThan:
2410 case Operator.GreaterThanOrEqual:
2411 if (TypeManager.IsEnumType (left.Type))
2414 if (left.IsZeroInteger)
2415 return left.TryReduce (ec, right.Type, loc);
2419 case Operator.Addition:
2420 case Operator.Subtraction:
2423 case Operator.Multiply:
2424 case Operator.Division:
2425 case Operator.Modulus:
2426 case Operator.LeftShift:
2427 case Operator.RightShift:
2428 if (TypeManager.IsEnumType (right.Type) || TypeManager.IsEnumType (left.Type))
2432 Error_OperatorCannotBeApplied (ec, this.left, this.right);
2437 // The `|' operator used on types which were extended is dangerous
2439 void CheckBitwiseOrOnSignExtended (ResolveContext ec)
2441 OpcodeCast lcast = left as OpcodeCast;
2442 if (lcast != null) {
2443 if (IsUnsigned (lcast.UnderlyingType))
2447 OpcodeCast rcast = right as OpcodeCast;
2448 if (rcast != null) {
2449 if (IsUnsigned (rcast.UnderlyingType))
2453 if (lcast == null && rcast == null)
2456 // FIXME: consider constants
2458 ec.Report.Warning (675, 3, loc,
2459 "The operator `|' used on the sign-extended type `{0}'. Consider casting to a smaller unsigned type first",
2460 TypeManager.CSharpName (lcast != null ? lcast.UnderlyingType : rcast.UnderlyingType));
2463 static void CreatePointerOperatorsTable ()
2465 var temp = new List<PredefinedPointerOperator> ();
2468 // Pointer arithmetic:
2470 // T* operator + (T* x, int y); T* operator - (T* x, int y);
2471 // T* operator + (T* x, uint y); T* operator - (T* x, uint y);
2472 // T* operator + (T* x, long y); T* operator - (T* x, long y);
2473 // T* operator + (T* x, ulong y); T* operator - (T* x, ulong y);
2475 temp.Add (new PredefinedPointerOperator (null, TypeManager.int32_type, Operator.AdditionMask | Operator.SubtractionMask));
2476 temp.Add (new PredefinedPointerOperator (null, TypeManager.uint32_type, Operator.AdditionMask | Operator.SubtractionMask));
2477 temp.Add (new PredefinedPointerOperator (null, TypeManager.int64_type, Operator.AdditionMask | Operator.SubtractionMask));
2478 temp.Add (new PredefinedPointerOperator (null, TypeManager.uint64_type, Operator.AdditionMask | Operator.SubtractionMask));
2481 // T* operator + (int y, T* x);
2482 // T* operator + (uint y, T *x);
2483 // T* operator + (long y, T *x);
2484 // T* operator + (ulong y, T *x);
2486 temp.Add (new PredefinedPointerOperator (TypeManager.int32_type, null, Operator.AdditionMask, null));
2487 temp.Add (new PredefinedPointerOperator (TypeManager.uint32_type, null, Operator.AdditionMask, null));
2488 temp.Add (new PredefinedPointerOperator (TypeManager.int64_type, null, Operator.AdditionMask, null));
2489 temp.Add (new PredefinedPointerOperator (TypeManager.uint64_type, null, Operator.AdditionMask, null));
2492 // long operator - (T* x, T *y)
2494 temp.Add (new PredefinedPointerOperator (null, Operator.SubtractionMask, TypeManager.int64_type));
2496 pointer_operators = temp.ToArray ();
2499 static void CreateStandardOperatorsTable ()
2501 var temp = new List<PredefinedOperator> ();
2502 Type bool_type = TypeManager.bool_type;
2504 temp.Add (new PredefinedOperator (TypeManager.int32_type, Operator.ArithmeticMask | Operator.BitwiseMask));
2505 temp.Add (new PredefinedOperator (TypeManager.uint32_type, Operator.ArithmeticMask | Operator.BitwiseMask));
2506 temp.Add (new PredefinedOperator (TypeManager.int64_type, Operator.ArithmeticMask | Operator.BitwiseMask));
2507 temp.Add (new PredefinedOperator (TypeManager.uint64_type, Operator.ArithmeticMask | Operator.BitwiseMask));
2508 temp.Add (new PredefinedOperator (TypeManager.float_type, Operator.ArithmeticMask));
2509 temp.Add (new PredefinedOperator (TypeManager.double_type, Operator.ArithmeticMask));
2510 temp.Add (new PredefinedOperator (TypeManager.decimal_type, Operator.ArithmeticMask));
2512 temp.Add (new PredefinedOperator (TypeManager.int32_type, Operator.ComparisonMask, bool_type));
2513 temp.Add (new PredefinedOperator (TypeManager.uint32_type, Operator.ComparisonMask, bool_type));
2514 temp.Add (new PredefinedOperator (TypeManager.int64_type, Operator.ComparisonMask, bool_type));
2515 temp.Add (new PredefinedOperator (TypeManager.uint64_type, Operator.ComparisonMask, bool_type));
2516 temp.Add (new PredefinedOperator (TypeManager.float_type, Operator.ComparisonMask, bool_type));
2517 temp.Add (new PredefinedOperator (TypeManager.double_type, Operator.ComparisonMask, bool_type));
2518 temp.Add (new PredefinedOperator (TypeManager.decimal_type, Operator.ComparisonMask, bool_type));
2520 temp.Add (new PredefinedOperator (TypeManager.string_type, Operator.EqualityMask, bool_type));
2522 temp.Add (new PredefinedStringOperator (TypeManager.string_type, Operator.AdditionMask));
2523 temp.Add (new PredefinedStringOperator (TypeManager.string_type, TypeManager.object_type, Operator.AdditionMask));
2524 temp.Add (new PredefinedStringOperator (TypeManager.object_type, TypeManager.string_type, Operator.AdditionMask));
2526 temp.Add (new PredefinedOperator (bool_type,
2527 Operator.BitwiseMask | Operator.LogicalMask | Operator.EqualityMask, bool_type));
2529 temp.Add (new PredefinedShiftOperator (TypeManager.int32_type, Operator.ShiftMask));
2530 temp.Add (new PredefinedShiftOperator (TypeManager.uint32_type, Operator.ShiftMask));
2531 temp.Add (new PredefinedShiftOperator (TypeManager.int64_type, Operator.ShiftMask));
2532 temp.Add (new PredefinedShiftOperator (TypeManager.uint64_type, Operator.ShiftMask));
2534 standard_operators = temp.ToArray ();
2538 // Rules used during binary numeric promotion
2540 static bool DoNumericPromotion (ResolveContext rc, ref Expression prim_expr, ref Expression second_expr, Type type)
2545 Constant c = prim_expr as Constant;
2547 temp = c.ConvertImplicitly (rc, type);
2554 if (type == TypeManager.uint32_type) {
2555 etype = prim_expr.Type;
2556 if (etype == TypeManager.int32_type || etype == TypeManager.short_type || etype == TypeManager.sbyte_type) {
2557 type = TypeManager.int64_type;
2559 if (type != second_expr.Type) {
2560 c = second_expr as Constant;
2562 temp = c.ConvertImplicitly (rc, type);
2564 temp = Convert.ImplicitNumericConversion (second_expr, type);
2570 } else if (type == TypeManager.uint64_type) {
2572 // A compile-time error occurs if the other operand is of type sbyte, short, int, or long
2574 if (type == TypeManager.int32_type || type == TypeManager.int64_type ||
2575 type == TypeManager.short_type || type == TypeManager.sbyte_type)
2579 temp = Convert.ImplicitNumericConversion (prim_expr, type);
2588 // 7.2.6.2 Binary numeric promotions
2590 public bool DoBinaryOperatorPromotion (ResolveContext ec)
2592 Type ltype = left.Type;
2593 Type rtype = right.Type;
2596 foreach (Type t in ConstantFold.binary_promotions) {
2598 return t == rtype || DoNumericPromotion (ec, ref right, ref left, t);
2601 return t == ltype || DoNumericPromotion (ec, ref left, ref right, t);
2604 Type int32 = TypeManager.int32_type;
2605 if (ltype != int32) {
2606 Constant c = left as Constant;
2608 temp = c.ConvertImplicitly (ec, int32);
2610 temp = Convert.ImplicitNumericConversion (left, int32);
2617 if (rtype != int32) {
2618 Constant c = right as Constant;
2620 temp = c.ConvertImplicitly (ec, int32);
2622 temp = Convert.ImplicitNumericConversion (right, int32);
2632 protected override Expression DoResolve (ResolveContext ec)
2637 if ((oper == Operator.Subtraction) && (left is ParenthesizedExpression)) {
2638 left = ((ParenthesizedExpression) left).Expr;
2639 left = left.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.Type);
2643 if (left.eclass == ExprClass.Type) {
2644 ec.Report.Error (75, loc, "To cast a negative value, you must enclose the value in parentheses");
2648 left = left.Resolve (ec);
2653 Constant lc = left as Constant;
2655 if (lc != null && lc.Type == TypeManager.bool_type &&
2656 ((oper == Operator.LogicalAnd && lc.IsDefaultValue) ||
2657 (oper == Operator.LogicalOr && !lc.IsDefaultValue))) {
2659 // FIXME: resolve right expression as unreachable
2660 // right.Resolve (ec);
2662 ec.Report.Warning (429, 4, loc, "Unreachable expression code detected");
2666 right = right.Resolve (ec);
2670 eclass = ExprClass.Value;
2671 Constant rc = right as Constant;
2673 // The conversion rules are ignored in enum context but why
2674 if (!ec.HasSet (ResolveContext.Options.EnumScope) && lc != null && rc != null && (TypeManager.IsEnumType (left.Type) || TypeManager.IsEnumType (right.Type))) {
2675 lc = EnumLiftUp (ec, lc, rc, loc);
2677 rc = EnumLiftUp (ec, rc, lc, loc);
2680 if (rc != null && lc != null) {
2681 int prev_e = ec.Report.Errors;
2682 Expression e = ConstantFold.BinaryFold (ec, oper, lc, rc, loc);
2686 if (e != null || ec.Report.Errors != prev_e)
2690 // Comparison warnings
2691 if ((oper & Operator.ComparisonMask) != 0) {
2692 if (left.Equals (right)) {
2693 ec.Report.Warning (1718, 3, loc, "A comparison made to same variable. Did you mean to compare something else?");
2695 CheckUselessComparison (ec, lc, right.Type);
2696 CheckUselessComparison (ec, rc, left.Type);
2699 if (TypeManager.IsDynamicType (left.Type) || TypeManager.IsDynamicType (right.Type)) {
2700 Arguments args = new Arguments (2);
2701 args.Add (new Argument (left));
2702 args.Add (new Argument (right));
2703 return new DynamicExpressionStatement (this, args, loc).Resolve (ec);
2706 if (RootContext.Version >= LanguageVersion.ISO_2 &&
2707 ((TypeManager.IsNullableType (left.Type) && (right is NullLiteral || TypeManager.IsNullableType (right.Type) || TypeManager.IsValueType (right.Type))) ||
2708 (TypeManager.IsValueType (left.Type) && right is NullLiteral) ||
2709 (TypeManager.IsNullableType (right.Type) && (left is NullLiteral || TypeManager.IsNullableType (left.Type) || TypeManager.IsValueType (left.Type))) ||
2710 (TypeManager.IsValueType (right.Type) && left is NullLiteral)))
2711 return new Nullable.LiftedBinaryOperator (oper, left, right, loc).Resolve (ec);
2713 return DoResolveCore (ec, left, right);
2716 protected Expression DoResolveCore (ResolveContext ec, Expression left_orig, Expression right_orig)
2718 Expression expr = ResolveOperator (ec);
2720 Error_OperatorCannotBeApplied (ec, left_orig, right_orig);
2722 if (left == null || right == null)
2723 throw new InternalErrorException ("Invalid conversion");
2725 if (oper == Operator.BitwiseOr)
2726 CheckBitwiseOrOnSignExtended (ec);
2732 public override SLE.Expression MakeExpression (BuilderContext ctx)
2734 var le = left.MakeExpression (ctx);
2735 var re = right.MakeExpression (ctx);
2736 bool is_checked = ctx.HasSet (BuilderContext.Options.CheckedScope);
2739 case Operator.Addition:
2740 return is_checked ? SLE.Expression.AddChecked (le, re) : SLE.Expression.Add (le, re);
2741 case Operator.BitwiseAnd:
2742 return SLE.Expression.And (le, re);
2743 case Operator.BitwiseOr:
2744 return SLE.Expression.Or (le, re);
2745 case Operator.Division:
2746 return SLE.Expression.Divide (le, re);
2747 case Operator.Equality:
2748 return SLE.Expression.Equal (le, re);
2749 case Operator.ExclusiveOr:
2750 return SLE.Expression.ExclusiveOr (le, re);
2751 case Operator.GreaterThan:
2752 return SLE.Expression.GreaterThan (le, re);
2753 case Operator.GreaterThanOrEqual:
2754 return SLE.Expression.GreaterThanOrEqual (le, re);
2755 case Operator.Inequality:
2756 return SLE.Expression.NotEqual (le, re);
2757 case Operator.LeftShift:
2758 return SLE.Expression.LeftShift (le, re);
2759 case Operator.LessThan:
2760 return SLE.Expression.LessThan (le, re);
2761 case Operator.LessThanOrEqual:
2762 return SLE.Expression.LessThanOrEqual (le, re);
2763 case Operator.LogicalAnd:
2764 return SLE.Expression.AndAlso (le, re);
2765 case Operator.LogicalOr:
2766 return SLE.Expression.OrElse (le, re);
2767 case Operator.Modulus:
2768 return SLE.Expression.Modulo (le, re);
2769 case Operator.Multiply:
2770 return is_checked ? SLE.Expression.MultiplyChecked (le, re) : SLE.Expression.Multiply (le, re);
2771 case Operator.RightShift:
2772 return SLE.Expression.RightShift (le, re);
2773 case Operator.Subtraction:
2774 return is_checked ? SLE.Expression.SubtractChecked (le, re) : SLE.Expression.Subtract (le, re);
2776 throw new NotImplementedException (oper.ToString ());
2781 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
2783 left.MutateHoistedGenericType (storey);
2784 right.MutateHoistedGenericType (storey);
2788 // D operator + (D x, D y)
2789 // D operator - (D x, D y)
2790 // bool operator == (D x, D y)
2791 // bool operator != (D x, D y)
2793 Expression ResolveOperatorDelegate (ResolveContext ec, Type l, Type r)
2795 bool is_equality = (oper & Operator.EqualityMask) != 0;
2796 if (!TypeManager.IsEqual (l, r) && !TypeManager.IsVariantOf (r, l)) {
2798 if (right.eclass == ExprClass.MethodGroup || (r == InternalType.AnonymousMethod && !is_equality)) {
2799 tmp = Convert.ImplicitConversionRequired (ec, right, l, loc);
2804 } else if (left.eclass == ExprClass.MethodGroup || (l == InternalType.AnonymousMethod && !is_equality)) {
2805 tmp = Convert.ImplicitConversionRequired (ec, left, r, loc);
2816 // Resolve delegate equality as a user operator
2819 return ResolveUserOperator (ec, l, r);
2822 Arguments args = new Arguments (2);
2823 args.Add (new Argument (left));
2824 args.Add (new Argument (right));
2826 if (oper == Operator.Addition) {
2827 if (TypeManager.delegate_combine_delegate_delegate == null) {
2828 TypeManager.delegate_combine_delegate_delegate = TypeManager.GetPredefinedMethod (
2829 TypeManager.delegate_type, "Combine", loc, TypeManager.delegate_type, TypeManager.delegate_type);
2832 method = TypeManager.delegate_combine_delegate_delegate;
2834 if (TypeManager.delegate_remove_delegate_delegate == null) {
2835 TypeManager.delegate_remove_delegate_delegate = TypeManager.GetPredefinedMethod (
2836 TypeManager.delegate_type, "Remove", loc, TypeManager.delegate_type, TypeManager.delegate_type);
2839 method = TypeManager.delegate_remove_delegate_delegate;
2842 MethodGroupExpr mg = new MethodGroupExpr (new MemberInfo [] { method }, TypeManager.delegate_type, loc);
2843 mg = mg.OverloadResolve (ec, ref args, false, loc);
2845 return new ClassCast (new UserOperatorCall (mg, args, CreateExpressionTree, loc), l);
2849 // Enumeration operators
2851 Expression ResolveOperatorEnum (ResolveContext ec, bool lenum, bool renum, Type ltype, Type rtype)
2854 // bool operator == (E x, E y);
2855 // bool operator != (E x, E y);
2856 // bool operator < (E x, E y);
2857 // bool operator > (E x, E y);
2858 // bool operator <= (E x, E y);
2859 // bool operator >= (E x, E y);
2861 // E operator & (E x, E y);
2862 // E operator | (E x, E y);
2863 // E operator ^ (E x, E y);
2865 // U operator - (E e, E f)
2866 // E operator - (E e, U x)
2868 // E operator + (U x, E e)
2869 // E operator + (E e, U x)
2871 if (!((oper & (Operator.ComparisonMask | Operator.BitwiseMask)) != 0 ||
2872 (oper == Operator.Subtraction && lenum) ||
2873 (oper == Operator.Addition && (lenum != renum || type != null)))) // type != null for lifted null
2876 Expression ltemp = left;
2877 Expression rtemp = right;
2878 Type underlying_type;
2881 if ((oper & (Operator.ComparisonMask | Operator.BitwiseMask)) != 0) {
2883 expr = Convert.ImplicitConversion (ec, left, rtype, loc);
2889 expr = Convert.ImplicitConversion (ec, right, ltype, loc);
2897 if (TypeManager.IsEqual (ltype, rtype)) {
2898 underlying_type = TypeManager.GetEnumUnderlyingType (ltype);
2900 if (left is Constant)
2901 left = ((Constant) left).ConvertExplicitly (false, underlying_type).Resolve (ec);
2903 left = EmptyCast.Create (left, underlying_type);
2905 if (right is Constant)
2906 right = ((Constant) right).ConvertExplicitly (false, underlying_type).Resolve (ec);
2908 right = EmptyCast.Create (right, underlying_type);
2910 underlying_type = TypeManager.GetEnumUnderlyingType (ltype);
2912 if (oper != Operator.Subtraction && oper != Operator.Addition) {
2913 Constant c = right as Constant;
2914 if (c == null || !c.IsDefaultValue)
2917 if (!Convert.ImplicitStandardConversionExists (right, underlying_type))
2920 right = Convert.ImplicitConversionStandard (ec, right, underlying_type, right.Location);
2923 if (left is Constant)
2924 left = ((Constant) left).ConvertExplicitly (false, underlying_type).Resolve (ec);
2926 left = EmptyCast.Create (left, underlying_type);
2929 underlying_type = TypeManager.GetEnumUnderlyingType (rtype);
2931 if (oper != Operator.Addition) {
2932 Constant c = left as Constant;
2933 if (c == null || !c.IsDefaultValue)
2936 if (!Convert.ImplicitStandardConversionExists (left, underlying_type))
2939 left = Convert.ImplicitConversionStandard (ec, left, underlying_type, left.Location);
2942 if (right is Constant)
2943 right = ((Constant) right).ConvertExplicitly (false, underlying_type).Resolve (ec);
2945 right = EmptyCast.Create (right, underlying_type);
2952 // C# specification uses explicit cast syntax which means binary promotion
2953 // should happen, however it seems that csc does not do that
2955 if (!DoBinaryOperatorPromotion (ec)) {
2961 Type res_type = null;
2962 if ((oper & Operator.BitwiseMask) != 0 || oper == Operator.Subtraction || oper == Operator.Addition) {
2963 Type promoted_type = lenum ? left.Type : right.Type;
2964 enum_conversion = Convert.ExplicitNumericConversion (
2965 new EmptyExpression (promoted_type), underlying_type);
2967 if (oper == Operator.Subtraction && renum && lenum)
2968 res_type = underlying_type;
2969 else if (oper == Operator.Addition && renum)
2975 expr = ResolveOperatorPredefined (ec, standard_operators, true, res_type);
2976 if (!is_compound || expr == null)
2984 // If the return type of the selected operator is implicitly convertible to the type of x
2986 if (Convert.ImplicitConversionExists (ec, expr, ltype))
2990 // Otherwise, if the selected operator is a predefined operator, if the return type of the
2991 // selected operator is explicitly convertible to the type of x, and if y is implicitly
2992 // convertible to the type of x or the operator is a shift operator, then the operation
2993 // is evaluated as x = (T)(x op y), where T is the type of x
2995 expr = Convert.ExplicitConversion (ec, expr, ltype, loc);
2999 if (Convert.ImplicitConversionExists (ec, ltemp, ltype))
3006 // 7.9.6 Reference type equality operators
3008 Binary ResolveOperatorEqualityRerefence (ResolveContext ec, Type l, Type r)
3011 // operator != (object a, object b)
3012 // operator == (object a, object b)
3015 // TODO: this method is almost equivalent to Convert.ImplicitReferenceConversion
3017 if (left.eclass == ExprClass.MethodGroup || right.eclass == ExprClass.MethodGroup)
3020 type = TypeManager.bool_type;
3021 GenericConstraints constraints;
3023 bool lgen = TypeManager.IsGenericParameter (l);
3025 if (TypeManager.IsEqual (l, r)) {
3028 // Only allow to compare same reference type parameter
3030 if (TypeManager.IsReferenceType (l)) {
3031 left = new BoxedCast (left, TypeManager.object_type);
3032 right = new BoxedCast (right, TypeManager.object_type);
3039 if (l == InternalType.AnonymousMethod)
3042 if (TypeManager.IsValueType (l))
3048 bool rgen = TypeManager.IsGenericParameter (r);
3051 // a, Both operands are reference-type values or the value null
3052 // b, One operand is a value of type T where T is a type-parameter and
3053 // the other operand is the value null. Furthermore T does not have the
3054 // value type constrain
3056 if (left is NullLiteral || right is NullLiteral) {
3058 constraints = TypeManager.GetTypeParameterConstraints (l);
3059 if (constraints != null && constraints.HasValueTypeConstraint)
3062 left = new BoxedCast (left, TypeManager.object_type);
3067 constraints = TypeManager.GetTypeParameterConstraints (r);
3068 if (constraints != null && constraints.HasValueTypeConstraint)
3071 right = new BoxedCast (right, TypeManager.object_type);
3077 // An interface is converted to the object before the
3078 // standard conversion is applied. It's not clear from the
3079 // standard but it looks like it works like that.
3082 if (!TypeManager.IsReferenceType (l))
3085 l = TypeManager.object_type;
3086 left = new BoxedCast (left, l);
3087 } else if (l.IsInterface) {
3088 l = TypeManager.object_type;
3089 } else if (TypeManager.IsStruct (l)) {
3094 if (!TypeManager.IsReferenceType (r))
3097 r = TypeManager.object_type;
3098 right = new BoxedCast (right, r);
3099 } else if (r.IsInterface) {
3100 r = TypeManager.object_type;
3101 } else if (TypeManager.IsStruct (r)) {
3106 const string ref_comparison = "Possible unintended reference comparison. " +
3107 "Consider casting the {0} side of the expression to `string' to compare the values";
3110 // A standard implicit conversion exists from the type of either
3111 // operand to the type of the other operand
3113 if (Convert.ImplicitReferenceConversionExists (left, r)) {
3114 if (l == TypeManager.string_type)
3115 ec.Report.Warning (253, 2, loc, ref_comparison, "right");
3120 if (Convert.ImplicitReferenceConversionExists (right, l)) {
3121 if (r == TypeManager.string_type)
3122 ec.Report.Warning (252, 2, loc, ref_comparison, "left");
3131 Expression ResolveOperatorPointer (ResolveContext ec, Type l, Type r)
3134 // bool operator == (void* x, void* y);
3135 // bool operator != (void* x, void* y);
3136 // bool operator < (void* x, void* y);
3137 // bool operator > (void* x, void* y);
3138 // bool operator <= (void* x, void* y);
3139 // bool operator >= (void* x, void* y);
3141 if ((oper & Operator.ComparisonMask) != 0) {
3144 temp = Convert.ImplicitConversion (ec, left, r, left.Location);
3151 temp = Convert.ImplicitConversion (ec, right, l, right.Location);
3157 type = TypeManager.bool_type;
3161 if (pointer_operators == null)
3162 CreatePointerOperatorsTable ();
3164 return ResolveOperatorPredefined (ec, pointer_operators, false, null);
3168 // Build-in operators method overloading
3170 protected virtual Expression ResolveOperatorPredefined (ResolveContext ec, PredefinedOperator [] operators, bool primitives_only, Type enum_type)
3172 PredefinedOperator best_operator = null;
3174 Type r = right.Type;
3175 Operator oper_mask = oper & ~Operator.ValuesOnlyMask;
3177 foreach (PredefinedOperator po in operators) {
3178 if ((po.OperatorsMask & oper_mask) == 0)
3181 if (primitives_only) {
3182 if (!po.IsPrimitiveApplicable (l, r))
3185 if (!po.IsApplicable (ec, left, right))
3189 if (best_operator == null) {
3191 if (primitives_only)
3197 best_operator = po.ResolveBetterOperator (ec, best_operator);
3199 if (best_operator == null) {
3200 ec.Report.Error (34, loc, "Operator `{0}' is ambiguous on operands of type `{1}' and `{2}'",
3201 OperName (oper), TypeManager.CSharpName (l), TypeManager.CSharpName (r));
3208 if (best_operator == null)
3211 Expression expr = best_operator.ConvertResult (ec, this);
3214 // Optimize &/&& constant expressions with 0 value
3216 if (oper == Operator.BitwiseAnd || oper == Operator.LogicalAnd) {
3217 Constant rc = right as Constant;
3218 Constant lc = left as Constant;
3219 if ((lc != null && lc.IsDefaultValue) || (rc != null && rc.IsDefaultValue)) {
3221 // The result is a constant with side-effect
3223 Constant side_effect = rc == null ?
3224 new SideEffectConstant (lc, right, loc) :
3225 new SideEffectConstant (rc, left, loc);
3227 return ReducedExpression.Create (side_effect.Resolve (ec), expr);
3231 if (enum_type == null)
3235 // HACK: required by enum_conversion
3237 expr.Type = enum_type;
3238 return EmptyCast.Create (expr, enum_type);
3242 // Performs user-operator overloading
3244 protected virtual Expression ResolveUserOperator (ResolveContext ec, Type l, Type r)
3247 if (oper == Operator.LogicalAnd)
3248 user_oper = Operator.BitwiseAnd;
3249 else if (oper == Operator.LogicalOr)
3250 user_oper = Operator.BitwiseOr;
3254 string op = GetOperatorMetadataName (user_oper);
3256 MethodGroupExpr left_operators = MemberLookup (ec.Compiler, ec.CurrentType, l, op, MemberTypes.Method, AllBindingFlags, loc) as MethodGroupExpr;
3257 MethodGroupExpr right_operators = null;
3259 if (!TypeManager.IsEqual (r, l)) {
3260 right_operators = MemberLookup (ec.Compiler, ec.CurrentType, r, op, MemberTypes.Method, AllBindingFlags, loc) as MethodGroupExpr;
3261 if (right_operators == null && left_operators == null)
3263 } else if (left_operators == null) {
3267 Arguments args = new Arguments (2);
3268 Argument larg = new Argument (left);
3270 Argument rarg = new Argument (right);
3273 MethodGroupExpr union;
3276 // User-defined operator implementations always take precedence
3277 // over predefined operator implementations
3279 if (left_operators != null && right_operators != null) {
3280 if (IsPredefinedUserOperator (l, user_oper)) {
3281 union = right_operators.OverloadResolve (ec, ref args, true, loc);
3283 union = left_operators;
3284 } else if (IsPredefinedUserOperator (r, user_oper)) {
3285 union = left_operators.OverloadResolve (ec, ref args, true, loc);
3287 union = right_operators;
3289 union = MethodGroupExpr.MakeUnionSet (left_operators, right_operators, loc);
3291 } else if (left_operators != null) {
3292 union = left_operators;
3294 union = right_operators;
3297 union = union.OverloadResolve (ec, ref args, true, loc);
3301 Expression oper_expr;
3303 // TODO: CreateExpressionTree is allocated every time
3304 if (user_oper != oper) {
3305 oper_expr = new ConditionalLogicalOperator (union, args, CreateExpressionTree,
3306 oper == Operator.LogicalAnd, loc).Resolve (ec);
3308 oper_expr = new UserOperatorCall (union, args, CreateExpressionTree, loc);
3311 // This is used to check if a test 'x == null' can be optimized to a reference equals,
3312 // and not invoke user operator
3314 if ((oper & Operator.EqualityMask) != 0) {
3315 if ((left is NullLiteral && IsBuildInEqualityOperator (r)) ||
3316 (right is NullLiteral && IsBuildInEqualityOperator (l))) {
3317 type = TypeManager.bool_type;
3318 if (left is NullLiteral || right is NullLiteral)
3319 oper_expr = ReducedExpression.Create (this, oper_expr);
3320 } else if (l != r) {
3321 MethodInfo mi = (MethodInfo) union;
3324 // Two System.Delegate(s) are never equal
3326 if (mi.DeclaringType == TypeManager.multicast_delegate_type)
3337 public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
3342 private void CheckUselessComparison (ResolveContext ec, Constant c, Type type)
3344 if (c == null || !IsTypeIntegral (type)
3345 || c is StringConstant
3346 || c is BoolConstant
3347 || c is FloatConstant
3348 || c is DoubleConstant
3349 || c is DecimalConstant
3355 if (c is ULongConstant) {
3356 ulong uvalue = ((ULongConstant) c).Value;
3357 if (uvalue > long.MaxValue) {
3358 if (type == TypeManager.byte_type ||
3359 type == TypeManager.sbyte_type ||
3360 type == TypeManager.short_type ||
3361 type == TypeManager.ushort_type ||
3362 type == TypeManager.int32_type ||
3363 type == TypeManager.uint32_type ||
3364 type == TypeManager.int64_type ||
3365 type == TypeManager.char_type)
3366 WarnUselessComparison (ec, type);
3369 value = (long) uvalue;
3371 else if (c is ByteConstant)
3372 value = ((ByteConstant) c).Value;
3373 else if (c is SByteConstant)
3374 value = ((SByteConstant) c).Value;
3375 else if (c is ShortConstant)
3376 value = ((ShortConstant) c).Value;
3377 else if (c is UShortConstant)
3378 value = ((UShortConstant) c).Value;
3379 else if (c is IntConstant)
3380 value = ((IntConstant) c).Value;
3381 else if (c is UIntConstant)
3382 value = ((UIntConstant) c).Value;
3383 else if (c is LongConstant)
3384 value = ((LongConstant) c).Value;
3385 else if (c is CharConstant)
3386 value = ((CharConstant)c).Value;
3391 if (IsValueOutOfRange (value, type))
3392 WarnUselessComparison (ec, type);
3395 static bool IsValueOutOfRange (long value, Type type)
3397 if (IsTypeUnsigned (type) && value < 0)
3399 return type == TypeManager.sbyte_type && (value >= 0x80 || value < -0x80) ||
3400 type == TypeManager.byte_type && value >= 0x100 ||
3401 type == TypeManager.short_type && (value >= 0x8000 || value < -0x8000) ||
3402 type == TypeManager.ushort_type && value >= 0x10000 ||
3403 type == TypeManager.int32_type && (value >= 0x80000000 || value < -0x80000000) ||
3404 type == TypeManager.uint32_type && value >= 0x100000000;
3407 static bool IsBuildInEqualityOperator (Type t)
3409 return t == TypeManager.object_type || t == TypeManager.string_type ||
3410 t == TypeManager.delegate_type || TypeManager.IsDelegateType (t);
3413 static bool IsPredefinedUserOperator (Type t, Operator op)
3416 // Some predefined types have user operators
3418 return (op & Operator.EqualityMask) != 0 && (t == TypeManager.string_type || t == TypeManager.decimal_type);
3421 private static bool IsTypeIntegral (Type type)
3423 return type == TypeManager.uint64_type ||
3424 type == TypeManager.int64_type ||
3425 type == TypeManager.uint32_type ||
3426 type == TypeManager.int32_type ||
3427 type == TypeManager.ushort_type ||
3428 type == TypeManager.short_type ||
3429 type == TypeManager.sbyte_type ||
3430 type == TypeManager.byte_type ||
3431 type == TypeManager.char_type;
3434 private static bool IsTypeUnsigned (Type type)
3436 return type == TypeManager.uint64_type ||
3437 type == TypeManager.uint32_type ||
3438 type == TypeManager.ushort_type ||
3439 type == TypeManager.byte_type ||
3440 type == TypeManager.char_type;
3443 private void WarnUselessComparison (ResolveContext ec, Type type)
3445 ec.Report.Warning (652, 2, loc, "A comparison between a constant and a variable is useless. The constant is out of the range of the variable type `{0}'",
3446 TypeManager.CSharpName (type));
3450 /// EmitBranchable is called from Statement.EmitBoolExpression in the
3451 /// context of a conditional bool expression. This function will return
3452 /// false if it is was possible to use EmitBranchable, or true if it was.
3454 /// The expression's code is generated, and we will generate a branch to `target'
3455 /// if the resulting expression value is equal to isTrue
3457 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
3459 ILGenerator ig = ec.ig;
3462 // This is more complicated than it looks, but its just to avoid
3463 // duplicated tests: basically, we allow ==, !=, >, <, >= and <=
3464 // but on top of that we want for == and != to use a special path
3465 // if we are comparing against null
3467 if ((oper == Operator.Equality || oper == Operator.Inequality) && (left is Constant || right is Constant)) {
3468 bool my_on_true = oper == Operator.Inequality ? on_true : !on_true;
3471 // put the constant on the rhs, for simplicity
3473 if (left is Constant) {
3474 Expression swap = right;
3479 if (((Constant) right).IsZeroInteger) {
3480 left.EmitBranchable (ec, target, my_on_true);
3483 if (right.Type == TypeManager.bool_type) {
3484 // right is a boolean, and it's not 'false' => it is 'true'
3485 left.EmitBranchable (ec, target, !my_on_true);
3489 } else if (oper == Operator.LogicalAnd) {
3492 Label tests_end = ig.DefineLabel ();
3494 left.EmitBranchable (ec, tests_end, false);
3495 right.EmitBranchable (ec, target, true);
3496 ig.MarkLabel (tests_end);
3499 // This optimizes code like this
3500 // if (true && i > 4)
3502 if (!(left is Constant))
3503 left.EmitBranchable (ec, target, false);
3505 if (!(right is Constant))
3506 right.EmitBranchable (ec, target, false);
3511 } else if (oper == Operator.LogicalOr){
3513 left.EmitBranchable (ec, target, true);
3514 right.EmitBranchable (ec, target, true);
3517 Label tests_end = ig.DefineLabel ();
3518 left.EmitBranchable (ec, tests_end, true);
3519 right.EmitBranchable (ec, target, false);
3520 ig.MarkLabel (tests_end);
3525 } else if (!(oper == Operator.LessThan || oper == Operator.GreaterThan ||
3526 oper == Operator.LessThanOrEqual || oper == Operator.GreaterThanOrEqual ||
3527 oper == Operator.Equality || oper == Operator.Inequality)) {
3528 base.EmitBranchable (ec, target, on_true);
3536 bool is_float = IsFloat (t);
3537 bool is_unsigned = is_float || IsUnsigned (t);
3540 case Operator.Equality:
3542 ig.Emit (OpCodes.Beq, target);
3544 ig.Emit (OpCodes.Bne_Un, target);
3547 case Operator.Inequality:
3549 ig.Emit (OpCodes.Bne_Un, target);
3551 ig.Emit (OpCodes.Beq, target);
3554 case Operator.LessThan:
3556 if (is_unsigned && !is_float)
3557 ig.Emit (OpCodes.Blt_Un, target);
3559 ig.Emit (OpCodes.Blt, target);
3562 ig.Emit (OpCodes.Bge_Un, target);
3564 ig.Emit (OpCodes.Bge, target);
3567 case Operator.GreaterThan:
3569 if (is_unsigned && !is_float)
3570 ig.Emit (OpCodes.Bgt_Un, target);
3572 ig.Emit (OpCodes.Bgt, target);
3575 ig.Emit (OpCodes.Ble_Un, target);
3577 ig.Emit (OpCodes.Ble, target);
3580 case Operator.LessThanOrEqual:
3582 if (is_unsigned && !is_float)
3583 ig.Emit (OpCodes.Ble_Un, target);
3585 ig.Emit (OpCodes.Ble, target);
3588 ig.Emit (OpCodes.Bgt_Un, target);
3590 ig.Emit (OpCodes.Bgt, target);
3594 case Operator.GreaterThanOrEqual:
3596 if (is_unsigned && !is_float)
3597 ig.Emit (OpCodes.Bge_Un, target);
3599 ig.Emit (OpCodes.Bge, target);
3602 ig.Emit (OpCodes.Blt_Un, target);
3604 ig.Emit (OpCodes.Blt, target);
3607 throw new InternalErrorException (oper.ToString ());
3611 public override void Emit (EmitContext ec)
3613 EmitOperator (ec, left.Type);
3616 protected virtual void EmitOperator (EmitContext ec, Type l)
3618 ILGenerator ig = ec.ig;
3621 // Handle short-circuit operators differently
3624 if ((oper & Operator.LogicalMask) != 0) {
3625 Label load_result = ig.DefineLabel ();
3626 Label end = ig.DefineLabel ();
3628 bool is_or = oper == Operator.LogicalOr;
3629 left.EmitBranchable (ec, load_result, is_or);
3631 ig.Emit (OpCodes.Br_S, end);
3633 ig.MarkLabel (load_result);
3634 ig.Emit (is_or ? OpCodes.Ldc_I4_1 : OpCodes.Ldc_I4_0);
3640 // Optimize zero-based operations which cannot be optimized at expression level
3642 if (oper == Operator.Subtraction) {
3643 var lc = left as IntegralConstant;
3644 if (lc != null && lc.IsDefaultValue) {
3646 ig.Emit (OpCodes.Neg);
3653 EmitOperatorOpcode (ec, oper, l);
3656 // Nullable enum could require underlying type cast and we cannot simply wrap binary
3657 // expression because that would wrap lifted binary operation
3659 if (enum_conversion != null)
3660 enum_conversion.Emit (ec);
3663 public override void EmitSideEffect (EmitContext ec)
3665 if ((oper & Operator.LogicalMask) != 0 ||
3666 (ec.HasSet (EmitContext.Options.CheckedScope) && (oper == Operator.Multiply || oper == Operator.Addition || oper == Operator.Subtraction))) {
3667 base.EmitSideEffect (ec);
3669 left.EmitSideEffect (ec);
3670 right.EmitSideEffect (ec);
3674 protected override void CloneTo (CloneContext clonectx, Expression t)
3676 Binary target = (Binary) t;
3678 target.left = left.Clone (clonectx);
3679 target.right = right.Clone (clonectx);
3682 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
3684 Arguments binder_args = new Arguments (3);
3686 MemberAccess sle = new MemberAccess (new MemberAccess (
3687 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
3689 CSharpBinderFlags flags = 0;
3690 if (ec.HasSet (ResolveContext.Options.CheckedScope))
3691 flags = CSharpBinderFlags.CheckedContext;
3693 if ((oper & Operator.LogicalMask) != 0)
3694 flags |= CSharpBinderFlags.BinaryOperationLogical;
3696 binder_args.Add (new Argument (new EnumConstant (new IntLiteral ((int) flags, loc), TypeManager.binder_flags)));
3697 binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), GetOperatorExpressionTypeName (), loc)));
3698 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (ec), loc)));
3700 return new Invocation (DynamicExpressionStatement.GetBinder ("BinaryOperation", loc), binder_args);
3703 public override Expression CreateExpressionTree (ResolveContext ec)
3705 return CreateExpressionTree (ec, null);
3708 Expression CreateExpressionTree (ResolveContext ec, MethodGroupExpr method)
3711 bool lift_arg = false;
3714 case Operator.Addition:
3715 if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
3716 method_name = "AddChecked";
3718 method_name = "Add";
3720 case Operator.BitwiseAnd:
3721 method_name = "And";
3723 case Operator.BitwiseOr:
3726 case Operator.Division:
3727 method_name = "Divide";
3729 case Operator.Equality:
3730 method_name = "Equal";
3733 case Operator.ExclusiveOr:
3734 method_name = "ExclusiveOr";
3736 case Operator.GreaterThan:
3737 method_name = "GreaterThan";
3740 case Operator.GreaterThanOrEqual:
3741 method_name = "GreaterThanOrEqual";
3744 case Operator.Inequality:
3745 method_name = "NotEqual";
3748 case Operator.LeftShift:
3749 method_name = "LeftShift";
3751 case Operator.LessThan:
3752 method_name = "LessThan";
3755 case Operator.LessThanOrEqual:
3756 method_name = "LessThanOrEqual";
3759 case Operator.LogicalAnd:
3760 method_name = "AndAlso";
3762 case Operator.LogicalOr:
3763 method_name = "OrElse";
3765 case Operator.Modulus:
3766 method_name = "Modulo";
3768 case Operator.Multiply:
3769 if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
3770 method_name = "MultiplyChecked";
3772 method_name = "Multiply";
3774 case Operator.RightShift:
3775 method_name = "RightShift";
3777 case Operator.Subtraction:
3778 if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
3779 method_name = "SubtractChecked";
3781 method_name = "Subtract";
3785 throw new InternalErrorException ("Unknown expression tree binary operator " + oper);
3788 Arguments args = new Arguments (2);
3789 args.Add (new Argument (left.CreateExpressionTree (ec)));
3790 args.Add (new Argument (right.CreateExpressionTree (ec)));
3791 if (method != null) {
3793 args.Add (new Argument (new BoolConstant (false, loc)));
3795 args.Add (new Argument (method.CreateExpressionTree (ec)));
3798 return CreateExpressionFactoryCall (ec, method_name, args);
3803 // Represents the operation a + b [+ c [+ d [+ ...]]], where a is a string
3804 // b, c, d... may be strings or objects.
3806 public class StringConcat : Expression {
3807 Arguments arguments;
3809 public StringConcat (Expression left, Expression right, Location loc)
3812 type = TypeManager.string_type;
3813 eclass = ExprClass.Value;
3815 arguments = new Arguments (2);
3818 public static StringConcat Create (ResolveContext rc, Expression left, Expression right, Location loc)
3820 if (left.eclass == ExprClass.Unresolved || right.eclass == ExprClass.Unresolved)
3821 throw new ArgumentException ();
3823 var s = new StringConcat (left, right, loc);
3824 s.Append (rc, left);
3825 s.Append (rc, right);
3829 public override Expression CreateExpressionTree (ResolveContext ec)
3831 Argument arg = arguments [0];
3832 return CreateExpressionAddCall (ec, arg, arg.CreateExpressionTree (ec), 1);
3836 // Creates nested calls tree from an array of arguments used for IL emit
3838 Expression CreateExpressionAddCall (ResolveContext ec, Argument left, Expression left_etree, int pos)
3840 Arguments concat_args = new Arguments (2);
3841 Arguments add_args = new Arguments (3);
3843 concat_args.Add (left);
3844 add_args.Add (new Argument (left_etree));
3846 concat_args.Add (arguments [pos]);
3847 add_args.Add (new Argument (arguments [pos].CreateExpressionTree (ec)));
3849 MethodGroupExpr method = CreateConcatMemberExpression ().Resolve (ec) as MethodGroupExpr;
3853 method = method.OverloadResolve (ec, ref concat_args, false, loc);
3857 add_args.Add (new Argument (method.CreateExpressionTree (ec)));
3859 Expression expr = CreateExpressionFactoryCall (ec, "Add", add_args);
3860 if (++pos == arguments.Count)
3863 left = new Argument (new EmptyExpression (((MethodInfo)method).ReturnType));
3864 return CreateExpressionAddCall (ec, left, expr, pos);
3867 protected override Expression DoResolve (ResolveContext ec)
3872 void Append (ResolveContext rc, Expression operand)
3877 StringConstant sc = operand as StringConstant;
3879 if (arguments.Count != 0) {
3880 Argument last_argument = arguments [arguments.Count - 1];
3881 StringConstant last_expr_constant = last_argument.Expr as StringConstant;
3882 if (last_expr_constant != null) {
3883 last_argument.Expr = new StringConstant (
3884 last_expr_constant.Value + sc.Value, sc.Location).Resolve (rc);
3890 // Multiple (3+) concatenation are resolved as multiple StringConcat instances
3892 StringConcat concat_oper = operand as StringConcat;
3893 if (concat_oper != null) {
3894 arguments.AddRange (concat_oper.arguments);
3899 arguments.Add (new Argument (operand));
3902 Expression CreateConcatMemberExpression ()
3904 return new MemberAccess (new MemberAccess (new QualifiedAliasMember ("global", "System", loc), "String", loc), "Concat", loc);
3907 public override void Emit (EmitContext ec)
3909 Expression concat = new Invocation (CreateConcatMemberExpression (), arguments, true);
3910 concat = concat.Resolve (new ResolveContext (ec.MemberContext));
3916 public override SLE.Expression MakeExpression (BuilderContext ctx)
3918 if (arguments.Count != 2)
3919 throw new NotImplementedException ("arguments.Count != 2");
3921 var concat = TypeManager.string_type.GetMethod ("Concat", new[] { typeof (object), typeof (object) });
3922 return SLE.Expression.Add (arguments[0].Expr.MakeExpression (ctx), arguments[1].Expr.MakeExpression (ctx), concat);
3926 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
3928 arguments.MutateHoistedGenericType (storey);
3933 // User-defined conditional logical operator
3935 public class ConditionalLogicalOperator : UserOperatorCall {
3936 readonly bool is_and;
3939 public ConditionalLogicalOperator (MethodGroupExpr oper_method, Arguments arguments,
3940 ExpressionTreeExpression expr_tree, bool is_and, Location loc)
3941 : base (oper_method, arguments, expr_tree, loc)
3943 this.is_and = is_and;
3944 eclass = ExprClass.Unresolved;
3947 protected override Expression DoResolve (ResolveContext ec)
3949 MethodInfo method = (MethodInfo)mg;
3950 type = TypeManager.TypeToCoreType (method.ReturnType);
3951 AParametersCollection pd = TypeManager.GetParameterData (method);
3952 if (!TypeManager.IsEqual (type, type) || !TypeManager.IsEqual (type, pd.Types [0]) || !TypeManager.IsEqual (type, pd.Types [1])) {
3953 ec.Report.Error (217, loc,
3954 "A user-defined operator `{0}' must have parameters and return values of the same type in order to be applicable as a short circuit operator",
3955 TypeManager.CSharpSignature (method));
3959 Expression left_dup = new EmptyExpression (type);
3960 Expression op_true = GetOperatorTrue (ec, left_dup, loc);
3961 Expression op_false = GetOperatorFalse (ec, left_dup, loc);
3962 if (op_true == null || op_false == null) {
3963 ec.Report.Error (218, loc,
3964 "The type `{0}' must have operator `true' and operator `false' defined when `{1}' is used as a short circuit operator",
3965 TypeManager.CSharpName (type), TypeManager.CSharpSignature (method));
3969 oper = is_and ? op_false : op_true;
3970 eclass = ExprClass.Value;
3974 public override void Emit (EmitContext ec)
3976 ILGenerator ig = ec.ig;
3977 Label end_target = ig.DefineLabel ();
3980 // Emit and duplicate left argument
3982 arguments [0].Expr.Emit (ec);
3983 ig.Emit (OpCodes.Dup);
3984 arguments.RemoveAt (0);
3986 oper.EmitBranchable (ec, end_target, true);
3988 ig.MarkLabel (end_target);
3992 public class PointerArithmetic : Expression {
3993 Expression left, right;
3997 // We assume that `l' is always a pointer
3999 public PointerArithmetic (Binary.Operator op, Expression l, Expression r, Type t, Location loc)
4008 public override Expression CreateExpressionTree (ResolveContext ec)
4010 Error_PointerInsideExpressionTree (ec);
4014 protected override Expression DoResolve (ResolveContext ec)
4016 eclass = ExprClass.Variable;
4018 if (left.Type == TypeManager.void_ptr_type) {
4019 ec.Report.Error (242, loc, "The operation in question is undefined on void pointers");
4026 public override void Emit (EmitContext ec)
4028 Type op_type = left.Type;
4029 ILGenerator ig = ec.ig;
4031 // It must be either array or fixed buffer
4033 if (TypeManager.HasElementType (op_type)) {
4034 element = TypeManager.GetElementType (op_type);
4036 FieldExpr fe = left as FieldExpr;
4038 element = AttributeTester.GetFixedBuffer (fe.FieldInfo).ElementType;
4043 int size = GetTypeSize (element);
4044 Type rtype = right.Type;
4046 if ((op & Binary.Operator.SubtractionMask) != 0 && rtype.IsPointer){
4048 // handle (pointer - pointer)
4052 ig.Emit (OpCodes.Sub);
4056 ig.Emit (OpCodes.Sizeof, element);
4058 IntLiteral.EmitInt (ig, size);
4059 ig.Emit (OpCodes.Div);
4061 ig.Emit (OpCodes.Conv_I8);
4064 // handle + and - on (pointer op int)
4066 Constant left_const = left as Constant;
4067 if (left_const != null) {
4069 // Optimize ((T*)null) pointer operations
4071 if (left_const.IsDefaultValue) {
4072 left = EmptyExpression.Null;
4080 Constant right_const = right as Constant;
4081 if (right_const != null) {
4083 // Optimize 0-based arithmetic
4085 if (right_const.IsDefaultValue)
4089 // TODO: Should be the checks resolve context sensitive?
4090 ResolveContext rc = new ResolveContext (ec.MemberContext);
4091 right = ConstantFold.BinaryFold (rc, Binary.Operator.Multiply, new IntConstant (size, right.Location).Resolve (rc), right_const, loc);
4095 ig.Emit (OpCodes.Sizeof, element);
4096 right = EmptyExpression.Null;
4101 if (rtype == TypeManager.sbyte_type || rtype == TypeManager.byte_type ||
4102 rtype == TypeManager.short_type || rtype == TypeManager.ushort_type) {
4103 ig.Emit (OpCodes.Conv_I);
4104 } else if (rtype == TypeManager.uint32_type) {
4105 ig.Emit (OpCodes.Conv_U);
4108 if (right_const == null && size != 1){
4110 ig.Emit (OpCodes.Sizeof, element);
4112 IntLiteral.EmitInt (ig, size);
4113 if (rtype == TypeManager.int64_type || rtype == TypeManager.uint64_type)
4114 ig.Emit (OpCodes.Conv_I8);
4116 Binary.EmitOperatorOpcode (ec, Binary.Operator.Multiply, rtype);
4119 if (left_const == null) {
4120 if (rtype == TypeManager.int64_type)
4121 ig.Emit (OpCodes.Conv_I);
4122 else if (rtype == TypeManager.uint64_type)
4123 ig.Emit (OpCodes.Conv_U);
4125 Binary.EmitOperatorOpcode (ec, op, op_type);
4132 // A boolean-expression is an expression that yields a result
4135 public class BooleanExpression : ShimExpression
4137 public BooleanExpression (Expression expr)
4140 this.loc = expr.Location;
4143 public override Expression CreateExpressionTree (ResolveContext ec)
4145 // TODO: We should emit IsTrue (v4) instead of direct user operator
4146 // call but that would break csc compatibility
4147 return base.CreateExpressionTree (ec);
4150 protected override Expression DoResolve (ResolveContext ec)
4152 // A boolean-expression is required to be of a type
4153 // that can be implicitly converted to bool or of
4154 // a type that implements operator true
4156 expr = expr.Resolve (ec);
4160 Assign ass = expr as Assign;
4161 if (ass != null && ass.Source is Constant) {
4162 ec.Report.Warning (665, 3, loc,
4163 "Assignment in conditional expression is always constant. Did you mean to use `==' instead ?");
4166 if (expr.Type == TypeManager.bool_type)
4169 if (TypeManager.IsDynamicType (expr.Type)) {
4170 Arguments args = new Arguments (1);
4171 args.Add (new Argument (expr));
4172 return new DynamicUnaryConversion ("IsTrue", args, loc).Resolve (ec);
4175 type = TypeManager.bool_type;
4176 Expression converted = Convert.ImplicitConversion (ec, expr, type, loc);
4177 if (converted != null)
4181 // If no implicit conversion to bool exists, try using `operator true'
4183 converted = GetOperatorTrue (ec, expr, loc);
4184 if (converted == null) {
4185 expr.Error_ValueCannotBeConverted (ec, loc, type, false);
4194 /// Implements the ternary conditional operator (?:)
4196 public class Conditional : Expression {
4197 Expression expr, true_expr, false_expr;
4199 public Conditional (BooleanExpression expr, Expression true_expr, Expression false_expr)
4202 this.true_expr = true_expr;
4203 this.false_expr = false_expr;
4204 this.loc = expr.Location;
4207 public Expression Expr {
4213 public Expression TrueExpr {
4219 public Expression FalseExpr {
4225 public override Expression CreateExpressionTree (ResolveContext ec)
4227 Arguments args = new Arguments (3);
4228 args.Add (new Argument (expr.CreateExpressionTree (ec)));
4229 args.Add (new Argument (true_expr.CreateExpressionTree (ec)));
4230 args.Add (new Argument (false_expr.CreateExpressionTree (ec)));
4231 return CreateExpressionFactoryCall (ec, "Condition", args);
4234 protected override Expression DoResolve (ResolveContext ec)
4236 expr = expr.Resolve (ec);
4237 true_expr = true_expr.Resolve (ec);
4238 false_expr = false_expr.Resolve (ec);
4240 if (true_expr == null || false_expr == null || expr == null)
4243 eclass = ExprClass.Value;
4244 Type true_type = true_expr.Type;
4245 Type false_type = false_expr.Type;
4249 // First, if an implicit conversion exists from true_expr
4250 // to false_expr, then the result type is of type false_expr.Type
4252 if (!TypeManager.IsEqual (true_type, false_type)) {
4253 Expression conv = Convert.ImplicitConversion (ec, true_expr, false_type, loc);
4256 // Check if both can convert implicitly to each other's type
4258 if (Convert.ImplicitConversion (ec, false_expr, true_type, loc) != null) {
4259 ec.Report.Error (172, loc,
4260 "Type of conditional expression cannot be determined as `{0}' and `{1}' convert implicitly to each other",
4261 TypeManager.CSharpName (true_type), TypeManager.CSharpName (false_type));
4266 } else if ((conv = Convert.ImplicitConversion (ec, false_expr, true_type, loc)) != null) {
4269 ec.Report.Error (173, loc,
4270 "Type of conditional expression cannot be determined because there is no implicit conversion between `{0}' and `{1}'",
4271 TypeManager.CSharpName (true_type), TypeManager.CSharpName (false_type));
4276 // Dead code optimalization
4277 Constant c = expr as Constant;
4279 bool is_false = c.IsDefaultValue;
4280 ec.Report.Warning (429, 4, is_false ? true_expr.Location : false_expr.Location, "Unreachable expression code detected");
4281 return ReducedExpression.Create (is_false ? false_expr : true_expr, this);
4287 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
4289 expr.MutateHoistedGenericType (storey);
4290 true_expr.MutateHoistedGenericType (storey);
4291 false_expr.MutateHoistedGenericType (storey);
4292 type = storey.MutateType (type);
4295 public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
4300 public override void Emit (EmitContext ec)
4302 ILGenerator ig = ec.ig;
4303 Label false_target = ig.DefineLabel ();
4304 Label end_target = ig.DefineLabel ();
4306 expr.EmitBranchable (ec, false_target, false);
4307 true_expr.Emit (ec);
4309 if (type.IsInterface) {
4310 LocalBuilder temp = ec.GetTemporaryLocal (type);
4311 ig.Emit (OpCodes.Stloc, temp);
4312 ig.Emit (OpCodes.Ldloc, temp);
4313 ec.FreeTemporaryLocal (temp, type);
4316 ig.Emit (OpCodes.Br, end_target);
4317 ig.MarkLabel (false_target);
4318 false_expr.Emit (ec);
4319 ig.MarkLabel (end_target);
4322 protected override void CloneTo (CloneContext clonectx, Expression t)
4324 Conditional target = (Conditional) t;
4326 target.expr = expr.Clone (clonectx);
4327 target.true_expr = true_expr.Clone (clonectx);
4328 target.false_expr = false_expr.Clone (clonectx);
4332 public abstract class VariableReference : Expression, IAssignMethod, IMemoryLocation, IVariableReference {
4333 LocalTemporary temp;
4336 public abstract HoistedVariable GetHoistedVariable (AnonymousExpression ae);
4337 public abstract bool IsFixed { get; }
4338 public abstract bool IsRef { get; }
4339 public abstract string Name { get; }
4340 public abstract void SetHasAddressTaken ();
4343 // Variable IL data, it has to be protected to encapsulate hoisted variables
4345 protected abstract ILocalVariable Variable { get; }
4348 // Variable flow-analysis data
4350 public abstract VariableInfo VariableInfo { get; }
4353 public virtual void AddressOf (EmitContext ec, AddressOp mode)
4355 HoistedVariable hv = GetHoistedVariable (ec);
4357 hv.AddressOf (ec, mode);
4361 Variable.EmitAddressOf (ec);
4364 public HoistedVariable GetHoistedVariable (ResolveContext rc)
4366 return GetHoistedVariable (rc.CurrentAnonymousMethod);
4369 public HoistedVariable GetHoistedVariable (EmitContext ec)
4371 return GetHoistedVariable (ec.CurrentAnonymousMethod);
4374 public override string GetSignatureForError ()
4379 public override void Emit (EmitContext ec)
4384 public override void EmitSideEffect (EmitContext ec)
4390 // This method is used by parameters that are references, that are
4391 // being passed as references: we only want to pass the pointer (that
4392 // is already stored in the parameter, not the address of the pointer,
4393 // and not the value of the variable).
4395 public void EmitLoad (EmitContext ec)
4400 public void Emit (EmitContext ec, bool leave_copy)
4402 Report.Debug (64, "VARIABLE EMIT", this, Variable, type, IsRef, loc);
4404 HoistedVariable hv = GetHoistedVariable (ec);
4406 hv.Emit (ec, leave_copy);
4414 // If we are a reference, we loaded on the stack a pointer
4415 // Now lets load the real value
4417 LoadFromPtr (ec.ig, type);
4421 ec.ig.Emit (OpCodes.Dup);
4424 temp = new LocalTemporary (Type);
4430 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy,
4431 bool prepare_for_load)
4433 HoistedVariable hv = GetHoistedVariable (ec);
4435 hv.EmitAssign (ec, source, leave_copy, prepare_for_load);
4439 New n_source = source as New;
4440 if (n_source != null) {
4441 if (!n_source.Emit (ec, this)) {
4454 ec.ig.Emit (OpCodes.Dup);
4456 temp = new LocalTemporary (Type);
4462 StoreFromPtr (ec.ig, type);
4464 Variable.EmitAssign (ec);
4472 public bool IsHoisted {
4473 get { return GetHoistedVariable ((AnonymousExpression) null) != null; }
4476 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
4478 type = storey.MutateType (type);
4485 public class LocalVariableReference : VariableReference {
4486 readonly string name;
4488 public LocalInfo local_info;
4491 public LocalVariableReference (Block block, string name, Location l)
4499 // Setting `is_readonly' to false will allow you to create a writable
4500 // reference to a read-only variable. This is used by foreach and using.
4502 public LocalVariableReference (Block block, string name, Location l,
4503 LocalInfo local_info, bool is_readonly)
4504 : this (block, name, l)
4506 this.local_info = local_info;
4507 this.is_readonly = is_readonly;
4510 public override VariableInfo VariableInfo {
4511 get { return local_info.VariableInfo; }
4514 public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
4516 return local_info.HoistedVariant;
4520 // A local variable is always fixed
4522 public override bool IsFixed {
4523 get { return true; }
4526 public override bool IsRef {
4527 get { return false; }
4530 public bool IsReadOnly {
4531 get { return is_readonly; }
4534 public override string Name {
4535 get { return name; }
4538 public bool VerifyAssigned (ResolveContext ec)
4540 VariableInfo variable_info = local_info.VariableInfo;
4541 return variable_info == null || variable_info.IsAssigned (ec, loc);
4544 void ResolveLocalInfo ()
4546 if (local_info == null) {
4547 local_info = Block.GetLocalInfo (Name);
4548 type = local_info.VariableType;
4549 is_readonly = local_info.ReadOnly;
4553 public override void SetHasAddressTaken ()
4555 local_info.AddressTaken = true;
4558 public override Expression CreateExpressionTree (ResolveContext ec)
4560 HoistedVariable hv = GetHoistedVariable (ec);
4562 return hv.CreateExpressionTree ();
4564 Arguments arg = new Arguments (1);
4565 arg.Add (new Argument (this));
4566 return CreateExpressionFactoryCall (ec, "Constant", arg);
4569 Expression DoResolveBase (ResolveContext ec)
4571 Expression e = Block.GetConstantExpression (Name);
4573 return e.Resolve (ec);
4575 VerifyAssigned (ec);
4578 // If we are referencing a variable from the external block
4579 // flag it for capturing
4581 if (ec.MustCaptureVariable (local_info)) {
4582 if (local_info.AddressTaken)
4583 AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, this, loc);
4585 if (ec.IsVariableCapturingRequired) {
4586 AnonymousMethodStorey storey = local_info.Block.Explicit.CreateAnonymousMethodStorey (ec);
4587 storey.CaptureLocalVariable (ec, local_info);
4591 eclass = ExprClass.Variable;
4592 type = local_info.VariableType;
4596 protected override Expression DoResolve (ResolveContext ec)
4598 ResolveLocalInfo ();
4599 local_info.Used = true;
4601 if (type == null && local_info.Type is VarExpr) {
4602 local_info.VariableType = TypeManager.object_type;
4603 Error_VariableIsUsedBeforeItIsDeclared (ec.Report, Name);
4607 return DoResolveBase (ec);
4610 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
4612 ResolveLocalInfo ();
4615 if (right_side == EmptyExpression.OutAccess.Instance)
4616 local_info.Used = true;
4618 // Infer implicitly typed local variable
4620 VarExpr ve = local_info.Type as VarExpr;
4622 if (!ve.InferType (ec, right_side))
4624 type = local_info.VariableType = ve.Type;
4631 if (right_side == EmptyExpression.OutAccess.Instance) {
4632 code = 1657; msg = "Cannot pass `{0}' as a ref or out argument because it is a `{1}'";
4633 } else if (right_side == EmptyExpression.LValueMemberAccess) {
4634 code = 1654; msg = "Cannot assign to members of `{0}' because it is a `{1}'";
4635 } else if (right_side == EmptyExpression.LValueMemberOutAccess) {
4636 code = 1655; msg = "Cannot pass members of `{0}' as ref or out arguments because it is a `{1}'";
4637 } else if (right_side == EmptyExpression.UnaryAddress) {
4638 code = 459; msg = "Cannot take the address of {1} `{0}'";
4640 code = 1656; msg = "Cannot assign to `{0}' because it is a `{1}'";
4642 ec.Report.Error (code, loc, msg, Name, local_info.GetReadOnlyContext ());
4643 } else if (VariableInfo != null) {
4644 VariableInfo.SetAssigned (ec);
4647 return DoResolveBase (ec);
4650 public override int GetHashCode ()
4652 return Name.GetHashCode ();
4655 public override bool Equals (object obj)
4657 LocalVariableReference lvr = obj as LocalVariableReference;
4661 return Name == lvr.Name && Block == lvr.Block;
4664 protected override ILocalVariable Variable {
4665 get { return local_info; }
4668 public override string ToString ()
4670 return String.Format ("{0} ({1}:{2})", GetType (), Name, loc);
4673 protected override void CloneTo (CloneContext clonectx, Expression t)
4675 LocalVariableReference target = (LocalVariableReference) t;
4677 target.Block = clonectx.LookupBlock (Block);
4678 if (local_info != null)
4679 target.local_info = clonectx.LookupVariable (local_info);
4684 /// This represents a reference to a parameter in the intermediate
4687 public class ParameterReference : VariableReference {
4688 readonly ToplevelParameterInfo pi;
4690 public ParameterReference (ToplevelParameterInfo pi, Location loc)
4696 public override bool IsRef {
4697 get { return (pi.Parameter.ModFlags & Parameter.Modifier.ISBYREF) != 0; }
4700 bool HasOutModifier {
4701 get { return pi.Parameter.ModFlags == Parameter.Modifier.OUT; }
4704 public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
4706 return pi.Parameter.HoistedVariant;
4710 // A ref or out parameter is classified as a moveable variable, even
4711 // if the argument given for the parameter is a fixed variable
4713 public override bool IsFixed {
4714 get { return !IsRef; }
4717 public override string Name {
4718 get { return Parameter.Name; }
4721 public Parameter Parameter {
4722 get { return pi.Parameter; }
4725 public override VariableInfo VariableInfo {
4726 get { return pi.VariableInfo; }
4729 protected override ILocalVariable Variable {
4730 get { return Parameter; }
4733 public bool IsAssigned (ResolveContext ec, Location loc)
4735 // HACK: Variables are not captured in probing mode
4736 if (ec.IsInProbingMode)
4739 if (!ec.DoFlowAnalysis || !HasOutModifier || ec.CurrentBranching.IsAssigned (VariableInfo))
4742 ec.Report.Error (269, loc, "Use of unassigned out parameter `{0}'", Name);
4746 public override void SetHasAddressTaken ()
4748 Parameter.HasAddressTaken = true;
4751 void SetAssigned (ResolveContext ec)
4753 if (HasOutModifier && ec.DoFlowAnalysis)
4754 ec.CurrentBranching.SetAssigned (VariableInfo);
4757 bool DoResolveBase (ResolveContext ec)
4759 type = pi.ParameterType;
4760 eclass = ExprClass.Variable;
4762 AnonymousExpression am = ec.CurrentAnonymousMethod;
4766 Block b = ec.CurrentBlock;
4769 IParameterData[] p = b.Toplevel.Parameters.FixedParameters;
4770 for (int i = 0; i < p.Length; ++i) {
4771 if (p [i] != Parameter)
4775 // Don't capture local parameters
4777 if (b == ec.CurrentBlock.Toplevel && !am.IsIterator)
4781 ec.Report.Error (1628, loc,
4782 "Parameter `{0}' cannot be used inside `{1}' when using `ref' or `out' modifier",
4783 Name, am.ContainerType);
4786 if (pi.Parameter.HasAddressTaken)
4787 AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, this, loc);
4789 if (ec.IsVariableCapturingRequired && !b.Toplevel.IsExpressionTree) {
4790 AnonymousMethodStorey storey = pi.Block.CreateAnonymousMethodStorey (ec);
4791 storey.CaptureParameter (ec, this);
4803 public override int GetHashCode ()
4805 return Name.GetHashCode ();
4808 public override bool Equals (object obj)
4810 ParameterReference pr = obj as ParameterReference;
4814 return Name == pr.Name;
4817 public override void AddressOf (EmitContext ec, AddressOp mode)
4820 // ParameterReferences might already be a reference
4827 base.AddressOf (ec, mode);
4830 protected override void CloneTo (CloneContext clonectx, Expression target)
4835 public override Expression CreateExpressionTree (ResolveContext ec)
4837 HoistedVariable hv = GetHoistedVariable (ec);
4839 return hv.CreateExpressionTree ();
4841 return Parameter.ExpressionTreeVariableReference ();
4845 // Notice that for ref/out parameters, the type exposed is not the
4846 // same type exposed externally.
4849 // externally we expose "int&"
4850 // here we expose "int".
4852 // We record this in "is_ref". This means that the type system can treat
4853 // the type as it is expected, but when we generate the code, we generate
4854 // the alternate kind of code.
4856 protected override Expression DoResolve (ResolveContext ec)
4858 if (!DoResolveBase (ec))
4861 // HACK: Variables are not captured in probing mode
4862 if (ec.IsInProbingMode)
4865 if (HasOutModifier && ec.DoFlowAnalysis &&
4866 (!ec.OmitStructFlowAnalysis || !VariableInfo.TypeInfo.IsStruct) && !IsAssigned (ec, loc))
4872 override public Expression DoResolveLValue (ResolveContext ec, Expression right_side)
4874 if (!DoResolveBase (ec))
4877 // HACK: parameters are not captured when probing is on
4878 if (!ec.IsInProbingMode)
4884 static public void EmitLdArg (ILGenerator ig, int x)
4887 case 0: ig.Emit (OpCodes.Ldarg_0); break;
4888 case 1: ig.Emit (OpCodes.Ldarg_1); break;
4889 case 2: ig.Emit (OpCodes.Ldarg_2); break;
4890 case 3: ig.Emit (OpCodes.Ldarg_3); break;
4892 if (x > byte.MaxValue)
4893 ig.Emit (OpCodes.Ldarg, x);
4895 ig.Emit (OpCodes.Ldarg_S, (byte) x);
4902 /// Invocation of methods or delegates.
4904 public class Invocation : ExpressionStatement
4906 protected Arguments arguments;
4907 protected Expression expr;
4908 protected MethodGroupExpr mg;
4909 bool arguments_resolved;
4912 // arguments is an ArrayList, but we do not want to typecast,
4913 // as it might be null.
4915 public Invocation (Expression expr, Arguments arguments)
4917 SimpleName sn = expr as SimpleName;
4919 this.expr = sn.GetMethodGroup ();
4923 this.arguments = arguments;
4925 loc = expr.Location;
4928 public Invocation (Expression expr, Arguments arguments, bool arguments_resolved)
4929 : this (expr, arguments)
4931 this.arguments_resolved = arguments_resolved;
4934 public override Expression CreateExpressionTree (ResolveContext ec)
4936 Expression instance = mg.IsInstance ?
4937 mg.InstanceExpression.CreateExpressionTree (ec) :
4938 new NullLiteral (loc);
4940 var args = Arguments.CreateForExpressionTree (ec, arguments,
4942 mg.CreateExpressionTree (ec));
4945 MemberExpr.Error_BaseAccessInExpressionTree (ec, loc);
4947 return CreateExpressionFactoryCall (ec, "Call", args);
4950 protected override Expression DoResolve (ResolveContext ec)
4952 Expression member_expr = expr.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
4953 if (member_expr == null)
4957 // Next, evaluate all the expressions in the argument list
4959 bool dynamic_arg = false;
4960 if (arguments != null && !arguments_resolved)
4961 arguments.Resolve (ec, out dynamic_arg);
4963 Type expr_type = member_expr.Type;
4964 mg = member_expr as MethodGroupExpr;
4966 bool dynamic_member = TypeManager.IsDynamicType (expr_type);
4968 if (!dynamic_member) {
4969 Expression invoke = null;
4972 if (expr_type != null && TypeManager.IsDelegateType (expr_type)) {
4973 invoke = new DelegateInvocation (member_expr, arguments, loc);
4974 invoke = invoke.Resolve (ec);
4975 if (invoke == null || !dynamic_arg)
4978 MemberExpr me = member_expr as MemberExpr;
4980 member_expr.Error_UnexpectedKind (ec, ResolveFlags.MethodGroup, loc);
4984 mg = ec.LookupExtensionMethod (me.Type, me.Name, loc);
4986 ec.Report.Error (1955, loc, "The member `{0}' cannot be used as method or delegate",
4987 member_expr.GetSignatureForError ());
4991 ((ExtensionMethodGroupExpr) mg).ExtensionExpression = me.InstanceExpression;
4995 if (invoke == null) {
4996 mg = DoResolveOverload (ec);
5002 if (dynamic_arg || dynamic_member)
5003 return DoResolveDynamic (ec, member_expr);
5005 MethodInfo method = (MethodInfo)mg;
5006 if (method != null) {
5007 type = TypeManager.TypeToCoreType (method.ReturnType);
5009 // TODO: this is a copy of mg.ResolveMemberAccess method
5010 Expression iexpr = mg.InstanceExpression;
5011 if (method.IsStatic) {
5012 if (iexpr == null ||
5013 iexpr is This || iexpr is EmptyExpression ||
5014 mg.IdenticalTypeName) {
5015 mg.InstanceExpression = null;
5017 MemberExpr.error176 (ec, loc, mg.GetSignatureForError ());
5021 if (iexpr == null || iexpr == EmptyExpression.Null) {
5022 SimpleName.Error_ObjectRefRequired (ec, loc, mg.GetSignatureForError ());
5028 // Only base will allow this invocation to happen.
5030 if (mg.IsBase && method.IsAbstract){
5031 Error_CannotCallAbstractBase (ec, TypeManager.CSharpSignature (method));
5035 if (arguments == null && method.DeclaringType == TypeManager.object_type && method.Name == Destructor.MetadataName) {
5037 ec.Report.Error (250, loc, "Do not directly call your base class Finalize method. It is called automatically from your destructor");
5039 ec.Report.Error (245, loc, "Destructors and object.Finalize cannot be called directly. Consider calling IDisposable.Dispose if available");
5043 IsSpecialMethodInvocation (ec, method, loc);
5045 if (mg.InstanceExpression != null)
5046 mg.InstanceExpression.CheckMarshalByRefAccess (ec);
5048 eclass = ExprClass.Value;
5052 Expression DoResolveDynamic (ResolveContext ec, Expression memberExpr)
5055 DynamicMemberBinder dmb = memberExpr as DynamicMemberBinder;
5057 args = dmb.Arguments;
5058 if (arguments != null)
5059 args.AddRange (arguments);
5060 } else if (mg == null) {
5061 if (arguments == null)
5062 args = new Arguments (1);
5066 args.Insert (0, new Argument (memberExpr));
5070 ec.Report.Error (1971, loc,
5071 "The base call to method `{0}' cannot be dynamically dispatched. Consider casting the dynamic arguments or eliminating the base access",
5078 if (mg.IsStatic != mg.IsInstance) {
5080 args = new Arguments (1);
5083 args.Insert (0, new Argument (new TypeOf (new TypeExpression (mg.DeclaringType, loc), loc).Resolve (ec), Argument.AType.DynamicTypeName));
5085 MemberAccess ma = expr as MemberAccess;
5087 args.Insert (0, new Argument (ma.Left.Resolve (ec)));
5089 args.Insert (0, new Argument (new This (loc).Resolve (ec)));
5094 return new DynamicInvocation (expr as ATypeNameExpression, args, loc).Resolve (ec);
5097 protected virtual MethodGroupExpr DoResolveOverload (ResolveContext ec)
5099 return mg.OverloadResolve (ec, ref arguments, false, loc);
5102 public static bool IsSpecialMethodInvocation (ResolveContext ec, MethodBase method, Location loc)
5104 if (!TypeManager.IsSpecialMethod (method))
5107 if (ec.HasSet (ResolveContext.Options.InvokeSpecialName))
5110 ec.Report.SymbolRelatedToPreviousError (method);
5111 ec.Report.Error (571, loc, "`{0}': cannot explicitly call operator or accessor",
5112 TypeManager.CSharpSignature (method, true));
5117 static Type[] GetVarargsTypes (MethodBase mb, Arguments arguments)
5119 AParametersCollection pd = TypeManager.GetParameterData (mb);
5121 Argument a = arguments [pd.Count - 1];
5122 Arglist list = (Arglist) a.Expr;
5124 return list.ArgumentTypes;
5128 /// This checks the ConditionalAttribute on the method
5130 public static bool IsMethodExcluded (MethodBase method, Location loc)
5132 if (method.IsConstructor)
5135 method = TypeManager.DropGenericMethodArguments (method);
5136 if (TypeManager.IsBeingCompiled (method)) {
5137 IMethodData md = TypeManager.GetMethod (method);
5139 return md.IsExcluded ();
5141 // For some methods (generated by delegate class) GetMethod returns null
5142 // because they are not included in builder_to_method table
5146 return AttributeTester.IsConditionalMethodExcluded (method, loc);
5150 /// is_base tells whether we want to force the use of the `call'
5151 /// opcode instead of using callvirt. Call is required to call
5152 /// a specific method, while callvirt will always use the most
5153 /// recent method in the vtable.
5155 /// is_static tells whether this is an invocation on a static method
5157 /// instance_expr is an expression that represents the instance
5158 /// it must be non-null if is_static is false.
5160 /// method is the method to invoke.
5162 /// Arguments is the list of arguments to pass to the method or constructor.
5164 public static void EmitCall (EmitContext ec, bool is_base,
5165 Expression instance_expr,
5166 MethodBase method, Arguments Arguments, Location loc)
5168 EmitCall (ec, is_base, instance_expr, method, Arguments, loc, false, false);
5171 // `dup_args' leaves an extra copy of the arguments on the stack
5172 // `omit_args' does not leave any arguments at all.
5173 // So, basically, you could make one call with `dup_args' set to true,
5174 // and then another with `omit_args' set to true, and the two calls
5175 // would have the same set of arguments. However, each argument would
5176 // only have been evaluated once.
5177 public static void EmitCall (EmitContext ec, bool is_base,
5178 Expression instance_expr,
5179 MethodBase method, Arguments Arguments, Location loc,
5180 bool dup_args, bool omit_args)
5182 ILGenerator ig = ec.ig;
5183 bool struct_call = false;
5184 bool this_call = false;
5185 LocalTemporary this_arg = null;
5187 Type decl_type = method.DeclaringType;
5189 if (IsMethodExcluded (method, loc))
5192 bool is_static = method.IsStatic;
5194 this_call = instance_expr is This;
5195 if (TypeManager.IsStruct (decl_type) || TypeManager.IsEnumType (decl_type))
5199 // If this is ourselves, push "this"
5203 Type iexpr_type = instance_expr.Type;
5206 // Push the instance expression
5208 if (TypeManager.IsValueType (iexpr_type) || TypeManager.IsGenericParameter (iexpr_type)) {
5210 // Special case: calls to a function declared in a
5211 // reference-type with a value-type argument need
5212 // to have their value boxed.
5213 if (TypeManager.IsStruct (decl_type) ||
5214 TypeManager.IsGenericParameter (iexpr_type)) {
5216 // If the expression implements IMemoryLocation, then
5217 // we can optimize and use AddressOf on the
5220 // If not we have to use some temporary storage for
5222 if (instance_expr is IMemoryLocation) {
5223 ((IMemoryLocation)instance_expr).
5224 AddressOf (ec, AddressOp.LoadStore);
5226 LocalTemporary temp = new LocalTemporary (iexpr_type);
5227 instance_expr.Emit (ec);
5229 temp.AddressOf (ec, AddressOp.Load);
5232 // avoid the overhead of doing this all the time.
5234 t = TypeManager.GetReferenceType (iexpr_type);
5236 instance_expr.Emit (ec);
5238 // FIXME: should use instance_expr is IMemoryLocation + constraint.
5239 // to help JIT to produce better code
5240 ig.Emit (OpCodes.Box, instance_expr.Type);
5241 t = TypeManager.object_type;
5244 instance_expr.Emit (ec);
5245 t = instance_expr.Type;
5249 ig.Emit (OpCodes.Dup);
5250 if (Arguments != null && Arguments.Count != 0) {
5251 this_arg = new LocalTemporary (t);
5252 this_arg.Store (ec);
5258 if (!omit_args && Arguments != null)
5259 Arguments.Emit (ec, dup_args, this_arg);
5262 if (is_static || struct_call || is_base || (this_call && !method.IsVirtual)) {
5263 call_op = OpCodes.Call;
5265 call_op = OpCodes.Callvirt;
5267 if ((instance_expr != null) && (instance_expr.Type.IsGenericParameter))
5268 ig.Emit (OpCodes.Constrained, instance_expr.Type);
5271 if ((method.CallingConvention & CallingConventions.VarArgs) != 0) {
5272 Type[] varargs_types = GetVarargsTypes (method, Arguments);
5273 ig.EmitCall (call_op, (MethodInfo) method, varargs_types);
5280 // and DoFoo is not virtual, you can omit the callvirt,
5281 // because you don't need the null checking behavior.
5283 if (method is MethodInfo)
5284 ig.Emit (call_op, (MethodInfo) method);
5286 ig.Emit (call_op, (ConstructorInfo) method);
5289 public override void Emit (EmitContext ec)
5291 mg.EmitCall (ec, arguments);
5294 public override void EmitStatement (EmitContext ec)
5299 // Pop the return value if there is one
5301 if (TypeManager.TypeToCoreType (type) != TypeManager.void_type)
5302 ec.ig.Emit (OpCodes.Pop);
5305 protected override void CloneTo (CloneContext clonectx, Expression t)
5307 Invocation target = (Invocation) t;
5309 if (arguments != null)
5310 target.arguments = arguments.Clone (clonectx);
5312 target.expr = expr.Clone (clonectx);
5316 public override SLE.Expression MakeExpression (BuilderContext ctx)
5318 return MakeExpression (ctx, mg.InstanceExpression, (MethodInfo) mg, arguments);
5321 public static SLE.Expression MakeExpression (BuilderContext ctx, Expression instance, MethodInfo mi, Arguments args)
5323 var instance_expr = instance == null ? null : instance.MakeExpression (ctx);
5324 return SLE.Expression.Call (instance_expr, mi, Arguments.MakeExpression (args, ctx));
5328 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
5330 mg.MutateHoistedGenericType (storey);
5331 type = storey.MutateType (type);
5332 if (arguments != null) {
5333 arguments.MutateHoistedGenericType (storey);
5339 /// Implements the new expression
5341 public class New : ExpressionStatement, IMemoryLocation {
5342 protected Arguments Arguments;
5345 // During bootstrap, it contains the RequestedType,
5346 // but if `type' is not null, it *might* contain a NewDelegate
5347 // (because of field multi-initialization)
5349 protected Expression RequestedType;
5351 protected MethodGroupExpr method;
5353 bool is_type_parameter;
5355 public New (Expression requested_type, Arguments arguments, Location l)
5357 RequestedType = requested_type;
5358 Arguments = arguments;
5363 /// Converts complex core type syntax like 'new int ()' to simple constant
5365 public static Constant Constantify (Type t)
5367 if (t == TypeManager.int32_type)
5368 return new IntConstant (0, Location.Null);
5369 if (t == TypeManager.uint32_type)
5370 return new UIntConstant (0, Location.Null);
5371 if (t == TypeManager.int64_type)
5372 return new LongConstant (0, Location.Null);
5373 if (t == TypeManager.uint64_type)
5374 return new ULongConstant (0, Location.Null);
5375 if (t == TypeManager.float_type)
5376 return new FloatConstant (0, Location.Null);
5377 if (t == TypeManager.double_type)
5378 return new DoubleConstant (0, Location.Null);
5379 if (t == TypeManager.short_type)
5380 return new ShortConstant (0, Location.Null);
5381 if (t == TypeManager.ushort_type)
5382 return new UShortConstant (0, Location.Null);
5383 if (t == TypeManager.sbyte_type)
5384 return new SByteConstant (0, Location.Null);
5385 if (t == TypeManager.byte_type)
5386 return new ByteConstant (0, Location.Null);
5387 if (t == TypeManager.char_type)
5388 return new CharConstant ('\0', Location.Null);
5389 if (t == TypeManager.bool_type)
5390 return new BoolConstant (false, Location.Null);
5391 if (t == TypeManager.decimal_type)
5392 return new DecimalConstant (0, Location.Null);
5393 if (TypeManager.IsEnumType (t))
5394 return new EnumConstant (Constantify (TypeManager.GetEnumUnderlyingType (t)), t);
5395 if (TypeManager.IsNullableType (t))
5396 return Nullable.LiftedNull.Create (t, Location.Null);
5402 // Checks whether the type is an interface that has the
5403 // [ComImport, CoClass] attributes and must be treated
5406 public Expression CheckComImport (ResolveContext ec)
5408 if (!type.IsInterface)
5412 // Turn the call into:
5413 // (the-interface-stated) (new class-referenced-in-coclassattribute ())
5415 Type real_class = AttributeTester.GetCoClassAttribute (type);
5416 if (real_class == null)
5419 New proxy = new New (new TypeExpression (real_class, loc), Arguments, loc);
5420 Cast cast = new Cast (new TypeExpression (type, loc), proxy, loc);
5421 return cast.Resolve (ec);
5424 public override Expression CreateExpressionTree (ResolveContext ec)
5427 if (method == null) {
5428 args = new Arguments (1);
5429 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
5431 args = Arguments.CreateForExpressionTree (ec,
5433 method.CreateExpressionTree (ec));
5436 return CreateExpressionFactoryCall (ec, "New", args);
5439 protected override Expression DoResolve (ResolveContext ec)
5442 // The New DoResolve might be called twice when initializing field
5443 // expressions (see EmitFieldInitializers, the call to
5444 // GetInitializerExpression will perform a resolve on the expression,
5445 // and later the assign will trigger another resolution
5447 // This leads to bugs (#37014)
5450 if (RequestedType is NewDelegate)
5451 return RequestedType;
5455 TypeExpr texpr = RequestedType.ResolveAsTypeTerminal (ec, false);
5461 if (type.IsPointer) {
5462 ec.Report.Error (1919, loc, "Unsafe type `{0}' cannot be used in an object creation expression",
5463 TypeManager.CSharpName (type));
5467 if (Arguments == null) {
5468 Constant c = Constantify (type);
5470 return ReducedExpression.Create (c.Resolve (ec), this);
5473 if (TypeManager.IsDelegateType (type)) {
5474 return (new NewDelegate (type, Arguments, loc)).Resolve (ec);
5477 if (TypeManager.IsGenericParameter (type)) {
5478 GenericConstraints gc = TypeManager.GetTypeParameterConstraints (type);
5480 if ((gc == null) || (!gc.HasConstructorConstraint && !gc.IsValueType)) {
5481 ec.Report.Error (304, loc,
5482 "Cannot create an instance of the variable type '{0}' because it doesn't have the new() constraint",
5483 TypeManager.CSharpName (type));
5487 if ((Arguments != null) && (Arguments.Count != 0)) {
5488 ec.Report.Error (417, loc,
5489 "`{0}': cannot provide arguments when creating an instance of a variable type",
5490 TypeManager.CSharpName (type));
5494 if (TypeManager.activator_create_instance == null) {
5495 Type activator_type = TypeManager.CoreLookupType (ec.Compiler, "System", "Activator", Kind.Class, true);
5496 if (activator_type != null) {
5497 TypeManager.activator_create_instance = TypeManager.GetPredefinedMethod (
5498 activator_type, "CreateInstance", loc, Type.EmptyTypes);
5502 is_type_parameter = true;
5503 eclass = ExprClass.Value;
5507 if (type.IsAbstract && type.IsSealed) {
5508 ec.Report.SymbolRelatedToPreviousError (type);
5509 ec.Report.Error (712, loc, "Cannot create an instance of the static class `{0}'", TypeManager.CSharpName (type));
5513 if (type.IsInterface || type.IsAbstract){
5514 if (!TypeManager.IsGenericType (type)) {
5515 RequestedType = CheckComImport (ec);
5516 if (RequestedType != null)
5517 return RequestedType;
5520 ec.Report.SymbolRelatedToPreviousError (type);
5521 ec.Report.Error (144, loc, "Cannot create an instance of the abstract class or interface `{0}'", TypeManager.CSharpName (type));
5525 bool is_struct = TypeManager.IsStruct (type);
5526 eclass = ExprClass.Value;
5529 // SRE returns a match for .ctor () on structs (the object constructor),
5530 // so we have to manually ignore it.
5532 if (is_struct && Arguments == null)
5535 // For member-lookup, treat 'new Foo (bar)' as call to 'foo.ctor (bar)', where 'foo' is of type 'Foo'.
5536 Expression ml = MemberLookupFinal (ec, type, type, ConstructorInfo.ConstructorName,
5537 MemberTypes.Constructor, AllBindingFlags | BindingFlags.DeclaredOnly, loc);
5540 if (Arguments != null) {
5541 Arguments.Resolve (ec, out dynamic);
5549 method = ml as MethodGroupExpr;
5550 if (method == null) {
5551 ml.Error_UnexpectedKind (ec, ResolveFlags.MethodGroup, loc);
5555 method = method.OverloadResolve (ec, ref Arguments, false, loc);
5560 Arguments.Insert (0, new Argument (new TypeOf (texpr, loc).Resolve (ec), Argument.AType.DynamicTypeName));
5561 return new DynamicConstructorBinder (type, Arguments, loc).Resolve (ec);
5567 bool DoEmitTypeParameter (EmitContext ec)
5569 ILGenerator ig = ec.ig;
5571 MethodInfo ci = TypeManager.activator_create_instance.MakeGenericMethod (
5572 new Type [] { type });
5574 GenericConstraints gc = TypeManager.GetTypeParameterConstraints (type);
5575 if (gc.HasReferenceTypeConstraint || gc.HasClassConstraint) {
5576 ig.Emit (OpCodes.Call, ci);
5580 // Allow DoEmit() to be called multiple times.
5581 // We need to create a new LocalTemporary each time since
5582 // you can't share LocalBuilders among ILGeneators.
5583 LocalTemporary temp = new LocalTemporary (type);
5585 Label label_activator = ig.DefineLabel ();
5586 Label label_end = ig.DefineLabel ();
5588 temp.AddressOf (ec, AddressOp.Store);
5589 ig.Emit (OpCodes.Initobj, type);
5592 ig.Emit (OpCodes.Box, type);
5593 ig.Emit (OpCodes.Brfalse, label_activator);
5595 temp.AddressOf (ec, AddressOp.Store);
5596 ig.Emit (OpCodes.Initobj, type);
5598 ig.Emit (OpCodes.Br_S, label_end);
5600 ig.MarkLabel (label_activator);
5602 ig.Emit (OpCodes.Call, ci);
5603 ig.MarkLabel (label_end);
5608 // This Emit can be invoked in two contexts:
5609 // * As a mechanism that will leave a value on the stack (new object)
5610 // * As one that wont (init struct)
5612 // If we are dealing with a ValueType, we have a few
5613 // situations to deal with:
5615 // * The target is a ValueType, and we have been provided
5616 // the instance (this is easy, we are being assigned).
5618 // * The target of New is being passed as an argument,
5619 // to a boxing operation or a function that takes a
5622 // In this case, we need to create a temporary variable
5623 // that is the argument of New.
5625 // Returns whether a value is left on the stack
5627 // *** Implementation note ***
5629 // To benefit from this optimization, each assignable expression
5630 // has to manually cast to New and call this Emit.
5632 // TODO: It's worth to implement it for arrays and fields
5634 public virtual bool Emit (EmitContext ec, IMemoryLocation target)
5636 bool is_value_type = TypeManager.IsValueType (type);
5637 ILGenerator ig = ec.ig;
5638 VariableReference vr = target as VariableReference;
5640 if (target != null && is_value_type && (vr != null || method == null)) {
5641 target.AddressOf (ec, AddressOp.Store);
5642 } else if (vr != null && vr.IsRef) {
5646 if (Arguments != null)
5647 Arguments.Emit (ec);
5649 if (is_value_type) {
5650 if (method == null) {
5651 ig.Emit (OpCodes.Initobj, type);
5656 ig.Emit (OpCodes.Call, (ConstructorInfo) method);
5661 if (is_type_parameter)
5662 return DoEmitTypeParameter (ec);
5664 ConstructorInfo ci = (ConstructorInfo) method;
5666 if (TypeManager.IsGenericType (type) && type.IsGenericTypeDefinition)
5667 ci = TypeBuilder.GetConstructor (type, ci);
5670 ig.Emit (OpCodes.Newobj, ci);
5674 public override void Emit (EmitContext ec)
5676 LocalTemporary v = null;
5677 if (method == null && TypeManager.IsValueType (type)) {
5678 // TODO: Use temporary variable from pool
5679 v = new LocalTemporary (type);
5686 public override void EmitStatement (EmitContext ec)
5688 LocalTemporary v = null;
5689 if (method == null && TypeManager.IsValueType (type)) {
5690 // TODO: Use temporary variable from pool
5691 v = new LocalTemporary (type);
5695 ec.ig.Emit (OpCodes.Pop);
5698 public virtual bool HasInitializer {
5704 public void AddressOf (EmitContext ec, AddressOp mode)
5706 EmitAddressOf (ec, mode);
5709 protected virtual IMemoryLocation EmitAddressOf (EmitContext ec, AddressOp mode)
5711 LocalTemporary value_target = new LocalTemporary (type);
5713 if (is_type_parameter) {
5714 DoEmitTypeParameter (ec);
5715 value_target.Store (ec);
5716 value_target.AddressOf (ec, mode);
5717 return value_target;
5720 if (!TypeManager.IsStruct (type)){
5722 // We throw an exception. So far, I believe we only need to support
5724 // foreach (int j in new StructType ())
5727 throw new Exception ("AddressOf should not be used for classes");
5730 value_target.AddressOf (ec, AddressOp.Store);
5732 if (method == null) {
5733 ec.ig.Emit (OpCodes.Initobj, type);
5735 if (Arguments != null)
5736 Arguments.Emit (ec);
5738 ec.ig.Emit (OpCodes.Call, (ConstructorInfo) method);
5741 value_target.AddressOf (ec, mode);
5742 return value_target;
5745 protected override void CloneTo (CloneContext clonectx, Expression t)
5747 New target = (New) t;
5749 target.RequestedType = RequestedType.Clone (clonectx);
5750 if (Arguments != null){
5751 target.Arguments = Arguments.Clone (clonectx);
5756 public override SLE.Expression MakeExpression (BuilderContext ctx)
5758 return SLE.Expression.New ((ConstructorInfo) method, Arguments.MakeExpression (Arguments, ctx));
5762 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
5764 if (method != null) {
5765 method.MutateHoistedGenericType (storey);
5766 if (Arguments != null) {
5767 Arguments.MutateHoistedGenericType (storey);
5771 type = storey.MutateType (type);
5775 public class ArrayInitializer : ShimExpression
5777 List<Expression> elements;
5779 public ArrayInitializer (List<Expression> init, Location loc)
5785 public ArrayInitializer (int count, Location loc)
5788 elements = new List<Expression> (count);
5791 public ArrayInitializer (Location loc)
5796 public void Add (Expression expr)
5798 elements.Add (expr);
5801 protected override void CloneTo (CloneContext clonectx, Expression t)
5803 var target = (ArrayInitializer) t;
5805 target.elements = new List<Expression> (elements.Count);
5806 foreach (var element in elements)
5807 target.elements.Add (element.Clone (clonectx));
5809 base.CloneTo (clonectx, t);
5813 get { return elements.Count; }
5816 protected override Expression DoResolve (ResolveContext rc)
5818 throw new NotImplementedException ();
5821 public Expression this [int index] {
5822 get { return elements [index]; }
5827 /// 14.5.10.2: Represents an array creation expression.
5831 /// There are two possible scenarios here: one is an array creation
5832 /// expression that specifies the dimensions and optionally the
5833 /// initialization data and the other which does not need dimensions
5834 /// specified but where initialization data is mandatory.
5836 class ArrayCreation : Expression
5838 FullNamedExpression requested_base_type;
5839 ArrayInitializer initializers;
5842 // The list of Argument types.
5843 // This is used to construct the `newarray' or constructor signature
5845 protected List<Expression> arguments;
5847 protected Type array_element_type;
5848 bool expect_initializers = false;
5849 int num_arguments = 0;
5850 protected int dimensions;
5851 protected readonly string rank;
5852 Expression first_emit;
5853 LocalTemporary first_emit_temp;
5855 protected List<Expression> array_data;
5857 Dictionary<int, int> bounds;
5859 // The number of constants in array initializers
5860 int const_initializers_count;
5861 bool only_constant_initializers;
5863 public ArrayCreation (FullNamedExpression requested_base_type, List<Expression> exprs, string rank, ArrayInitializer initializers, Location l)
5865 this.requested_base_type = requested_base_type;
5866 this.initializers = initializers;
5870 arguments = new List<Expression> (exprs);
5871 num_arguments = arguments.Count;
5874 public ArrayCreation (FullNamedExpression requested_base_type, string rank, ArrayInitializer initializers, Location l)
5876 this.requested_base_type = requested_base_type;
5877 this.initializers = initializers;
5881 //this.rank = rank.Substring (0, rank.LastIndexOf ('['));
5883 //string tmp = rank.Substring (rank.LastIndexOf ('['));
5885 //dimensions = tmp.Length - 1;
5886 expect_initializers = true;
5889 protected override void Error_NegativeArrayIndex (ResolveContext ec, Location loc)
5891 ec.Report.Error (248, loc, "Cannot create an array with a negative size");
5894 bool CheckIndices (ResolveContext ec, ArrayInitializer probe, int idx, bool specified_dims, int child_bounds)
5896 if (specified_dims) {
5897 Expression a = arguments [idx];
5902 Constant c = a as Constant;
5904 c = c.ImplicitConversionRequired (ec, TypeManager.int32_type, a.Location);
5908 ec.Report.Error (150, a.Location, "A constant value is expected");
5912 int value = (int) c.GetValue ();
5914 if (value != probe.Count) {
5915 ec.Report.Error (847, loc, "An array initializer of length `{0}' was expected", value);
5919 bounds [idx] = value;
5922 only_constant_initializers = true;
5923 for (int i = 0; i < probe.Count; ++i) {
5925 if (o is ArrayInitializer) {
5926 var sub_probe = o as ArrayInitializer;
5927 if (idx + 1 >= dimensions){
5928 ec.Report.Error (623, loc, "Array initializers can only be used in a variable or field initializer. Try using a new expression instead");
5932 bool ret = CheckIndices (ec, sub_probe, idx + 1, specified_dims, child_bounds - 1);
5935 } else if (child_bounds > 1) {
5936 ec.Report.Error (846, o.Location, "A nested array initializer was expected");
5938 Expression element = ResolveArrayElement (ec, o);
5939 if (element == null)
5942 // Initializers with the default values can be ignored
5943 Constant c = element as Constant;
5945 if (c.IsDefaultInitializer (array_element_type)) {
5949 ++const_initializers_count;
5952 only_constant_initializers = false;
5955 array_data.Add (element);
5962 public override Expression CreateExpressionTree (ResolveContext ec)
5966 if (array_data == null) {
5967 args = new Arguments (arguments.Count + 1);
5968 args.Add (new Argument (new TypeOf (new TypeExpression (array_element_type, loc), loc)));
5969 foreach (Expression a in arguments)
5970 args.Add (new Argument (a.CreateExpressionTree (ec)));
5972 return CreateExpressionFactoryCall (ec, "NewArrayBounds", args);
5975 if (dimensions > 1) {
5976 ec.Report.Error (838, loc, "An expression tree cannot contain a multidimensional array initializer");
5980 args = new Arguments (array_data == null ? 1 : array_data.Count + 1);
5981 args.Add (new Argument (new TypeOf (new TypeExpression (array_element_type, loc), loc)));
5982 if (array_data != null) {
5983 for (int i = 0; i < array_data.Count; ++i) {
5984 Expression e = array_data [i];
5986 e = Convert.ImplicitConversion (ec, initializers [i], array_element_type, loc);
5988 args.Add (new Argument (e.CreateExpressionTree (ec)));
5992 return CreateExpressionFactoryCall (ec, "NewArrayInit", args);
5995 public void UpdateIndices ()
5998 for (var probe = initializers; probe != null;) {
5999 if (probe.Count > 0 && probe [0] is ArrayInitializer) {
6000 Expression e = new IntConstant (probe.Count, Location.Null);
6003 bounds [i++] = probe.Count;
6005 probe = (ArrayInitializer) probe[0];
6008 Expression e = new IntConstant (probe.Count, Location.Null);
6011 bounds [i++] = probe.Count;
6017 protected virtual Expression ResolveArrayElement (ResolveContext ec, Expression element)
6019 element = element.Resolve (ec);
6020 if (element == null)
6023 if (element is CompoundAssign.TargetExpression) {
6024 if (first_emit != null)
6025 throw new InternalErrorException ("Can only handle one mutator at a time");
6026 first_emit = element;
6027 element = first_emit_temp = new LocalTemporary (element.Type);
6030 return Convert.ImplicitConversionRequired (
6031 ec, element, array_element_type, loc);
6034 protected bool ResolveInitializers (ResolveContext ec)
6036 if (initializers == null) {
6037 return !expect_initializers;
6041 // We use this to store all the date values in the order in which we
6042 // will need to store them in the byte blob later
6044 array_data = new List<Expression> ();
6045 bounds = new Dictionary<int, int> ();
6047 if (arguments != null)
6048 return CheckIndices (ec, initializers, 0, true, dimensions);
6050 arguments = new List<Expression> ();
6052 if (!CheckIndices (ec, initializers, 0, false, dimensions))
6061 // Resolved the type of the array
6063 bool ResolveArrayType (ResolveContext ec)
6065 if (requested_base_type is VarExpr) {
6066 ec.Report.Error (820, loc, "An implicitly typed local variable declarator cannot use an array initializer");
6070 StringBuilder array_qualifier = new StringBuilder (rank);
6073 // `In the first form allocates an array instace of the type that results
6074 // from deleting each of the individual expression from the expression list'
6076 if (num_arguments > 0) {
6077 array_qualifier.Append ("[");
6078 for (int i = num_arguments-1; i > 0; i--)
6079 array_qualifier.Append (",");
6080 array_qualifier.Append ("]");
6086 TypeExpr array_type_expr;
6087 array_type_expr = new ComposedCast (requested_base_type, array_qualifier.ToString (), loc);
6088 array_type_expr = array_type_expr.ResolveAsTypeTerminal (ec, false);
6089 if (array_type_expr == null)
6092 type = array_type_expr.Type;
6093 if (!type.IsArray) {
6094 ec.Report.Error (622, loc, "Can only use array initializer expressions to assign to array types. Try using a new expression instead");
6098 array_element_type = TypeManager.GetElementType (type);
6099 dimensions = type.GetArrayRank ();
6104 protected override Expression DoResolve (ResolveContext ec)
6109 if (!ResolveArrayType (ec))
6113 // First step is to validate the initializers and fill
6114 // in any missing bits
6116 if (!ResolveInitializers (ec))
6119 for (int i = 0; i < arguments.Count; ++i) {
6120 Expression e = arguments[i].Resolve (ec);
6124 arguments [i] = ConvertExpressionToArrayIndex (ec, e);
6127 eclass = ExprClass.Value;
6131 MethodInfo GetArrayMethod (EmitContext ec, int arguments)
6133 ModuleBuilder mb = RootContext.ToplevelTypes.Builder;
6135 Type[] arg_types = new Type[arguments];
6136 for (int i = 0; i < arguments; i++)
6137 arg_types[i] = TypeManager.int32_type;
6139 MethodInfo mi = mb.GetArrayMethod (type, ".ctor", CallingConventions.HasThis, null,
6143 ec.Report.Error (-6, "New invocation: Can not find a constructor for " +
6144 "this argument list");
6151 byte [] MakeByteBlob ()
6156 int count = array_data.Count;
6158 Type element_type = array_element_type;
6159 if (TypeManager.IsEnumType (element_type))
6160 element_type = TypeManager.GetEnumUnderlyingType (element_type);
6162 factor = GetTypeSize (element_type);
6164 throw new Exception ("unrecognized type in MakeByteBlob: " + element_type);
6166 data = new byte [(count * factor + 3) & ~3];
6169 for (int i = 0; i < count; ++i) {
6170 object v = array_data [i];
6172 if (v is EnumConstant)
6173 v = ((EnumConstant) v).Child;
6175 if (v is Constant && !(v is StringConstant))
6176 v = ((Constant) v).GetValue ();
6182 if (element_type == TypeManager.int64_type){
6183 if (!(v is Expression)){
6184 long val = (long) v;
6186 for (int j = 0; j < factor; ++j) {
6187 data [idx + j] = (byte) (val & 0xFF);
6191 } else if (element_type == TypeManager.uint64_type){
6192 if (!(v is Expression)){
6193 ulong val = (ulong) v;
6195 for (int j = 0; j < factor; ++j) {
6196 data [idx + j] = (byte) (val & 0xFF);
6200 } else if (element_type == TypeManager.float_type) {
6201 if (!(v is Expression)){
6202 element = BitConverter.GetBytes ((float) v);
6204 for (int j = 0; j < factor; ++j)
6205 data [idx + j] = element [j];
6206 if (!BitConverter.IsLittleEndian)
6207 System.Array.Reverse (data, idx, 4);
6209 } else if (element_type == TypeManager.double_type) {
6210 if (!(v is Expression)){
6211 element = BitConverter.GetBytes ((double) v);
6213 for (int j = 0; j < factor; ++j)
6214 data [idx + j] = element [j];
6216 // FIXME: Handle the ARM float format.
6217 if (!BitConverter.IsLittleEndian)
6218 System.Array.Reverse (data, idx, 8);
6220 } else if (element_type == TypeManager.char_type){
6221 if (!(v is Expression)){
6222 int val = (int) ((char) v);
6224 data [idx] = (byte) (val & 0xff);
6225 data [idx+1] = (byte) (val >> 8);
6227 } else if (element_type == TypeManager.short_type){
6228 if (!(v is Expression)){
6229 int val = (int) ((short) v);
6231 data [idx] = (byte) (val & 0xff);
6232 data [idx+1] = (byte) (val >> 8);
6234 } else if (element_type == TypeManager.ushort_type){
6235 if (!(v is Expression)){
6236 int val = (int) ((ushort) v);
6238 data [idx] = (byte) (val & 0xff);
6239 data [idx+1] = (byte) (val >> 8);
6241 } else if (element_type == TypeManager.int32_type) {
6242 if (!(v is Expression)){
6245 data [idx] = (byte) (val & 0xff);
6246 data [idx+1] = (byte) ((val >> 8) & 0xff);
6247 data [idx+2] = (byte) ((val >> 16) & 0xff);
6248 data [idx+3] = (byte) (val >> 24);
6250 } else if (element_type == TypeManager.uint32_type) {
6251 if (!(v is Expression)){
6252 uint val = (uint) v;
6254 data [idx] = (byte) (val & 0xff);
6255 data [idx+1] = (byte) ((val >> 8) & 0xff);
6256 data [idx+2] = (byte) ((val >> 16) & 0xff);
6257 data [idx+3] = (byte) (val >> 24);
6259 } else if (element_type == TypeManager.sbyte_type) {
6260 if (!(v is Expression)){
6261 sbyte val = (sbyte) v;
6262 data [idx] = (byte) val;
6264 } else if (element_type == TypeManager.byte_type) {
6265 if (!(v is Expression)){
6266 byte val = (byte) v;
6267 data [idx] = (byte) val;
6269 } else if (element_type == TypeManager.bool_type) {
6270 if (!(v is Expression)){
6271 bool val = (bool) v;
6272 data [idx] = (byte) (val ? 1 : 0);
6274 } else if (element_type == TypeManager.decimal_type){
6275 if (!(v is Expression)){
6276 int [] bits = Decimal.GetBits ((decimal) v);
6279 // FIXME: For some reason, this doesn't work on the MS runtime.
6280 int [] nbits = new int [4];
6281 nbits [0] = bits [3];
6282 nbits [1] = bits [2];
6283 nbits [2] = bits [0];
6284 nbits [3] = bits [1];
6286 for (int j = 0; j < 4; j++){
6287 data [p++] = (byte) (nbits [j] & 0xff);
6288 data [p++] = (byte) ((nbits [j] >> 8) & 0xff);
6289 data [p++] = (byte) ((nbits [j] >> 16) & 0xff);
6290 data [p++] = (byte) (nbits [j] >> 24);
6294 throw new Exception ("Unrecognized type in MakeByteBlob: " + element_type);
6304 public override SLE.Expression MakeExpression (BuilderContext ctx)
6306 var initializers = new SLE.Expression [array_data.Count];
6307 for (var i = 0; i < initializers.Length; i++) {
6308 if (array_data [i] == null)
6309 initializers [i] = SLE.Expression.Default (array_element_type);
6311 initializers [i] = array_data [i].MakeExpression (ctx);
6314 return SLE.Expression.NewArrayInit (array_element_type, initializers);
6318 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
6320 array_element_type = storey.MutateType (array_element_type);
6321 type = storey.MutateType (type);
6322 if (arguments != null) {
6323 foreach (Expression e in arguments)
6324 e.MutateHoistedGenericType (storey);
6327 if (array_data != null) {
6328 foreach (Expression e in array_data) {
6329 // Don't mutate values optimized away
6333 e.MutateHoistedGenericType (storey);
6339 // Emits the initializers for the array
6341 void EmitStaticInitializers (EmitContext ec)
6343 // FIXME: This should go to Resolve !
6344 if (TypeManager.void_initializearray_array_fieldhandle == null) {
6345 TypeManager.void_initializearray_array_fieldhandle = TypeManager.GetPredefinedMethod (
6346 TypeManager.runtime_helpers_type, "InitializeArray", loc,
6347 TypeManager.array_type, TypeManager.runtime_field_handle_type);
6348 if (TypeManager.void_initializearray_array_fieldhandle == null)
6353 // First, the static data
6356 ILGenerator ig = ec.ig;
6358 byte [] data = MakeByteBlob ();
6360 fb = RootContext.MakeStaticData (data);
6362 ig.Emit (OpCodes.Dup);
6363 ig.Emit (OpCodes.Ldtoken, fb);
6364 ig.Emit (OpCodes.Call,
6365 TypeManager.void_initializearray_array_fieldhandle);
6369 // Emits pieces of the array that can not be computed at compile
6370 // time (variables and string locations).
6372 // This always expect the top value on the stack to be the array
6374 void EmitDynamicInitializers (EmitContext ec, bool emitConstants)
6376 ILGenerator ig = ec.ig;
6377 int dims = bounds.Count;
6378 int [] current_pos = new int [dims];
6380 MethodInfo set = null;
6383 Type [] args = new Type [dims + 1];
6385 for (int j = 0; j < dims; j++)
6386 args [j] = TypeManager.int32_type;
6387 args [dims] = array_element_type;
6389 set = RootContext.ToplevelTypes.Builder.GetArrayMethod (
6391 CallingConventions.HasThis | CallingConventions.Standard,
6392 TypeManager.void_type, args);
6395 for (int i = 0; i < array_data.Count; i++){
6397 Expression e = array_data [i];
6399 // Constant can be initialized via StaticInitializer
6400 if (e != null && !(!emitConstants && e is Constant)) {
6401 Type etype = e.Type;
6403 ig.Emit (OpCodes.Dup);
6405 for (int idx = 0; idx < dims; idx++)
6406 IntConstant.EmitInt (ig, current_pos [idx]);
6409 // If we are dealing with a struct, get the
6410 // address of it, so we can store it.
6412 if ((dims == 1) && TypeManager.IsStruct (etype) &&
6413 (!TypeManager.IsBuiltinOrEnum (etype) ||
6414 etype == TypeManager.decimal_type)) {
6416 ig.Emit (OpCodes.Ldelema, etype);
6422 bool is_stobj, has_type_arg;
6423 OpCode op = ArrayAccess.GetStoreOpcode (etype, out is_stobj, out has_type_arg);
6425 ig.Emit (OpCodes.Stobj, etype);
6426 else if (has_type_arg)
6427 ig.Emit (op, etype);
6431 ig.Emit (OpCodes.Call, set);
6438 for (int j = dims - 1; j >= 0; j--){
6440 if (current_pos [j] < bounds [j])
6442 current_pos [j] = 0;
6447 public override void Emit (EmitContext ec)
6449 ILGenerator ig = ec.ig;
6451 if (first_emit != null) {
6452 first_emit.Emit (ec);
6453 first_emit_temp.Store (ec);
6456 foreach (Expression e in arguments)
6459 if (arguments.Count == 1)
6460 ig.Emit (OpCodes.Newarr, TypeManager.TypeToReflectionType (array_element_type));
6462 ig.Emit (OpCodes.Newobj, GetArrayMethod (ec, arguments.Count));
6465 if (initializers == null)
6468 // Emit static initializer for arrays which have contain more than 2 items and
6469 // the static initializer will initialize at least 25% of array values.
6470 // NOTE: const_initializers_count does not contain default constant values.
6471 if (const_initializers_count > 2 && const_initializers_count * 4 > (array_data.Count) &&
6472 (TypeManager.IsPrimitiveType (array_element_type) || TypeManager.IsEnumType (array_element_type))) {
6473 EmitStaticInitializers (ec);
6475 if (!only_constant_initializers)
6476 EmitDynamicInitializers (ec, false);
6478 EmitDynamicInitializers (ec, true);
6481 if (first_emit_temp != null)
6482 first_emit_temp.Release (ec);
6485 public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
6487 if (arguments.Count != 1) {
6488 // ec.Report.Error (-211, Location, "attribute can not encode multi-dimensional arrays");
6489 return base.GetAttributableValue (ec, null, out value);
6492 if (array_data == null) {
6493 Expression arg = arguments [0];
6495 if (arg.GetAttributableValue (ec, arg.Type, out arg_value) && arg_value is int && (int)arg_value == 0) {
6496 value = Array.CreateInstance (array_element_type, 0);
6500 // ec.Report.Error (-212, Location, "array should be initialized when passing it to an attribute");
6501 return base.GetAttributableValue (ec, null, out value);
6504 Array ret = Array.CreateInstance (array_element_type, array_data.Count);
6505 object element_value;
6506 for (int i = 0; i < ret.Length; ++i)
6508 Expression e = array_data [i];
6510 // Is null when an initializer is optimized (value == predefined value)
6514 if (!e.GetAttributableValue (ec, array_element_type, out element_value)) {
6518 ret.SetValue (element_value, i);
6524 protected override void CloneTo (CloneContext clonectx, Expression t)
6526 ArrayCreation target = (ArrayCreation) t;
6528 if (requested_base_type != null)
6529 target.requested_base_type = (FullNamedExpression)requested_base_type.Clone (clonectx);
6531 if (arguments != null){
6532 target.arguments = new List<Expression> (arguments.Count);
6533 foreach (Expression e in arguments)
6534 target.arguments.Add (e.Clone (clonectx));
6537 if (initializers != null)
6538 target.initializers = (ArrayInitializer) initializers.Clone (clonectx);
6543 // Represents an implicitly typed array epxression
6545 class ImplicitlyTypedArrayCreation : ArrayCreation
6547 public ImplicitlyTypedArrayCreation (string rank, ArrayInitializer initializers, Location loc)
6548 : base (null, rank, initializers, loc)
6550 if (rank.Length > 2) {
6551 while (rank [++dimensions] == ',');
6557 protected override Expression DoResolve (ResolveContext ec)
6562 if (!ResolveInitializers (ec))
6565 if (array_element_type == null || array_element_type == TypeManager.null_type ||
6566 array_element_type == TypeManager.void_type || array_element_type == InternalType.AnonymousMethod ||
6567 array_element_type == InternalType.MethodGroup ||
6568 arguments.Count != dimensions) {
6569 Error_NoBestType (ec);
6574 // At this point we found common base type for all initializer elements
6575 // but we have to be sure that all static initializer elements are of
6578 UnifyInitializerElement (ec);
6580 type = TypeManager.GetConstructedType (array_element_type, rank);
6581 eclass = ExprClass.Value;
6585 void Error_NoBestType (ResolveContext ec)
6587 ec.Report.Error (826, loc,
6588 "The type of an implicitly typed array cannot be inferred from the initializer. Try specifying array type explicitly");
6592 // Converts static initializer only
6594 void UnifyInitializerElement (ResolveContext ec)
6596 for (int i = 0; i < array_data.Count; ++i) {
6597 Expression e = (Expression)array_data[i];
6599 array_data [i] = Convert.ImplicitConversion (ec, e, array_element_type, Location.Null);
6603 protected override Expression ResolveArrayElement (ResolveContext ec, Expression element)
6605 element = element.Resolve (ec);
6606 if (element == null)
6609 if (array_element_type == null) {
6610 if (element.Type != TypeManager.null_type)
6611 array_element_type = element.Type;
6616 if (Convert.ImplicitConversionExists (ec, element, array_element_type)) {
6620 if (Convert.ImplicitConversionExists (ec, new TypeExpression (array_element_type, loc), element.Type)) {
6621 array_element_type = element.Type;
6625 Error_NoBestType (ec);
6630 public sealed class CompilerGeneratedThis : This
6632 public static This Instance = new CompilerGeneratedThis ();
6634 private CompilerGeneratedThis ()
6635 : base (Location.Null)
6639 public CompilerGeneratedThis (Type type, Location loc)
6645 protected override Expression DoResolve (ResolveContext ec)
6647 eclass = ExprClass.Variable;
6649 type = ec.CurrentType;
6651 is_struct = type.IsValueType;
6655 public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
6662 /// Represents the `this' construct
6665 public class This : VariableReference
6667 sealed class ThisVariable : ILocalVariable
6669 public static readonly ILocalVariable Instance = new ThisVariable ();
6671 public void Emit (EmitContext ec)
6673 ec.ig.Emit (OpCodes.Ldarg_0);
6676 public void EmitAssign (EmitContext ec)
6678 throw new InvalidOperationException ();
6681 public void EmitAddressOf (EmitContext ec)
6683 ec.ig.Emit (OpCodes.Ldarg_0);
6688 VariableInfo variable_info;
6689 protected bool is_struct;
6691 public This (Block block, Location loc)
6697 public This (Location loc)
6702 public override VariableInfo VariableInfo {
6703 get { return variable_info; }
6706 public override bool IsFixed {
6707 get { return false; }
6710 public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
6715 AnonymousMethodStorey storey = ae.Storey;
6716 while (storey != null) {
6717 AnonymousMethodStorey temp = storey.Parent as AnonymousMethodStorey;
6719 return storey.HoistedThis;
6727 public override bool IsRef {
6728 get { return is_struct; }
6731 protected override ILocalVariable Variable {
6732 get { return ThisVariable.Instance; }
6735 public static bool IsThisAvailable (ResolveContext ec)
6737 if (ec.IsStatic || ec.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.BaseInitializer | ResolveContext.Options.ConstantScope))
6740 if (ec.CurrentAnonymousMethod == null)
6743 if (ec.CurrentType.IsValueType && ec.CurrentIterator == null)
6749 public bool ResolveBase (ResolveContext ec)
6751 eclass = ExprClass.Variable;
6752 type = ec.CurrentType;
6754 if (!IsThisAvailable (ec)) {
6755 if (ec.IsStatic && !ec.HasSet (ResolveContext.Options.ConstantScope)) {
6756 ec.Report.Error (26, loc, "Keyword `this' is not valid in a static property, static method, or static field initializer");
6757 } else if (ec.CurrentAnonymousMethod != null) {
6758 ec.Report.Error (1673, loc,
6759 "Anonymous methods inside structs cannot access instance members of `this'. " +
6760 "Consider copying `this' to a local variable outside the anonymous method and using the local instead");
6762 ec.Report.Error (27, loc, "Keyword `this' is not available in the current context");
6766 is_struct = type.IsValueType;
6768 if (block != null) {
6769 if (block.Toplevel.ThisVariable != null)
6770 variable_info = block.Toplevel.ThisVariable.VariableInfo;
6772 AnonymousExpression am = ec.CurrentAnonymousMethod;
6773 if (am != null && ec.IsVariableCapturingRequired) {
6774 am.SetHasThisAccess ();
6782 // Called from Invocation to check if the invocation is correct
6784 public override void CheckMarshalByRefAccess (ResolveContext ec)
6786 if ((variable_info != null) && !(TypeManager.IsStruct (type) && ec.OmitStructFlowAnalysis) &&
6787 !variable_info.IsAssigned (ec)) {
6788 ec.Report.Error (188, loc,
6789 "The `this' object cannot be used before all of its fields are assigned to");
6790 variable_info.SetAssigned (ec);
6794 public override Expression CreateExpressionTree (ResolveContext ec)
6796 Arguments args = new Arguments (1);
6797 args.Add (new Argument (this));
6799 // Use typeless constant for ldarg.0 to save some
6800 // space and avoid problems with anonymous stories
6801 return CreateExpressionFactoryCall (ec, "Constant", args);
6804 protected override Expression DoResolve (ResolveContext ec)
6810 override public Expression DoResolveLValue (ResolveContext ec, Expression right_side)
6812 if (!ResolveBase (ec))
6815 if (variable_info != null)
6816 variable_info.SetAssigned (ec);
6818 if (ec.CurrentType.IsClass){
6819 if (right_side == EmptyExpression.UnaryAddress)
6820 ec.Report.Error (459, loc, "Cannot take the address of `this' because it is read-only");
6821 else if (right_side == EmptyExpression.OutAccess.Instance)
6822 ec.Report.Error (1605, loc, "Cannot pass `this' as a ref or out argument because it is read-only");
6824 ec.Report.Error (1604, loc, "Cannot assign to `this' because it is read-only");
6830 public override int GetHashCode()
6832 return block.GetHashCode ();
6835 public override string Name {
6836 get { return "this"; }
6839 public override bool Equals (object obj)
6841 This t = obj as This;
6845 return block == t.block;
6848 protected override void CloneTo (CloneContext clonectx, Expression t)
6850 This target = (This) t;
6852 target.block = clonectx.LookupBlock (block);
6855 public override void SetHasAddressTaken ()
6862 /// Represents the `__arglist' construct
6864 public class ArglistAccess : Expression
6866 public ArglistAccess (Location loc)
6871 public override Expression CreateExpressionTree (ResolveContext ec)
6873 throw new NotSupportedException ("ET");
6876 protected override Expression DoResolve (ResolveContext ec)
6878 eclass = ExprClass.Variable;
6879 type = TypeManager.runtime_argument_handle_type;
6881 if (ec.HasSet (ResolveContext.Options.FieldInitializerScope) || !ec.CurrentBlock.Toplevel.Parameters.HasArglist) {
6882 ec.Report.Error (190, loc,
6883 "The __arglist construct is valid only within a variable argument method");
6889 public override void Emit (EmitContext ec)
6891 ec.ig.Emit (OpCodes.Arglist);
6894 protected override void CloneTo (CloneContext clonectx, Expression target)
6901 /// Represents the `__arglist (....)' construct
6903 class Arglist : Expression
6905 Arguments Arguments;
6907 public Arglist (Location loc)
6912 public Arglist (Arguments args, Location l)
6918 public Type[] ArgumentTypes {
6920 if (Arguments == null)
6921 return Type.EmptyTypes;
6923 Type[] retval = new Type [Arguments.Count];
6924 for (int i = 0; i < retval.Length; i++)
6925 retval [i] = Arguments [i].Expr.Type;
6931 public override Expression CreateExpressionTree (ResolveContext ec)
6933 ec.Report.Error (1952, loc, "An expression tree cannot contain a method with variable arguments");
6937 protected override Expression DoResolve (ResolveContext ec)
6939 eclass = ExprClass.Variable;
6940 type = InternalType.Arglist;
6941 if (Arguments != null) {
6942 bool dynamic; // Can be ignored as there is always only 1 overload
6943 Arguments.Resolve (ec, out dynamic);
6949 public override void Emit (EmitContext ec)
6951 if (Arguments != null)
6952 Arguments.Emit (ec);
6955 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
6957 if (Arguments != null)
6958 Arguments.MutateHoistedGenericType (storey);
6961 protected override void CloneTo (CloneContext clonectx, Expression t)
6963 Arglist target = (Arglist) t;
6965 if (Arguments != null)
6966 target.Arguments = Arguments.Clone (clonectx);
6971 /// Implements the typeof operator
6973 public class TypeOf : Expression {
6974 Expression QueriedType;
6975 protected Type typearg;
6977 public TypeOf (Expression queried_type, Location l)
6979 QueriedType = queried_type;
6983 public override Expression CreateExpressionTree (ResolveContext ec)
6985 Arguments args = new Arguments (2);
6986 args.Add (new Argument (this));
6987 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
6988 return CreateExpressionFactoryCall (ec, "Constant", args);
6991 protected override Expression DoResolve (ResolveContext ec)
6993 TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
6997 typearg = texpr.Type;
6999 if (typearg == TypeManager.void_type) {
7000 ec.Report.Error (673, loc, "System.Void cannot be used from C#. Use typeof (void) to get the void type object");
7001 } else if (typearg.IsPointer && !ec.IsUnsafe){
7002 UnsafeError (ec, loc);
7003 } else if (texpr is DynamicTypeExpr) {
7004 ec.Report.Error (1962, QueriedType.Location,
7005 "The typeof operator cannot be used on the dynamic type");
7008 type = TypeManager.type_type;
7010 return DoResolveBase ();
7013 protected Expression DoResolveBase ()
7015 if (TypeManager.system_type_get_type_from_handle == null) {
7016 TypeManager.system_type_get_type_from_handle = TypeManager.GetPredefinedMethod (
7017 TypeManager.type_type, "GetTypeFromHandle", loc, TypeManager.runtime_handle_type);
7020 // Even though what is returned is a type object, it's treated as a value by the compiler.
7021 // In particular, 'typeof (Foo).X' is something totally different from 'Foo.X'.
7022 eclass = ExprClass.Value;
7026 public override void Emit (EmitContext ec)
7028 ec.ig.Emit (OpCodes.Ldtoken, TypeManager.TypeToReflectionType (typearg));
7029 ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
7032 public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
7034 if (TypeManager.ContainsGenericParameters (typearg) &&
7035 !TypeManager.IsGenericTypeDefinition (typearg)) {
7036 ec.Report.SymbolRelatedToPreviousError (typearg);
7037 ec.Report.Error (416, loc, "`{0}': an attribute argument cannot use type parameters",
7038 TypeManager.CSharpName (typearg));
7043 if (value_type == TypeManager.object_type) {
7044 value = (object)typearg;
7051 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
7053 typearg = storey.MutateType (typearg);
7056 public Type TypeArgument {
7062 protected override void CloneTo (CloneContext clonectx, Expression t)
7064 TypeOf target = (TypeOf) t;
7065 if (QueriedType != null)
7066 target.QueriedType = QueriedType.Clone (clonectx);
7071 /// Implements the `typeof (void)' operator
7073 public class TypeOfVoid : TypeOf {
7074 public TypeOfVoid (Location l) : base (null, l)
7079 protected override Expression DoResolve (ResolveContext ec)
7081 type = TypeManager.type_type;
7082 typearg = TypeManager.void_type;
7084 return DoResolveBase ();
7088 class TypeOfMethod : TypeOfMember
7090 public TypeOfMethod (MethodBase method, Location loc)
7091 : base (method, loc)
7095 protected override Expression DoResolve (ResolveContext ec)
7097 if (member is MethodInfo) {
7098 type = TypeManager.methodinfo_type;
7100 type = TypeManager.methodinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", "MethodInfo", Kind.Class, true);
7102 type = TypeManager.ctorinfo_type;
7104 type = TypeManager.ctorinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", "ConstructorInfo", Kind.Class, true);
7107 return base.DoResolve (ec);
7110 public override void Emit (EmitContext ec)
7112 if (member is ConstructorInfo)
7113 ec.ig.Emit (OpCodes.Ldtoken, (ConstructorInfo) member);
7115 ec.ig.Emit (OpCodes.Ldtoken, (MethodInfo) member);
7118 ec.ig.Emit (OpCodes.Castclass, type);
7121 protected override string GetMethodName {
7122 get { return "GetMethodFromHandle"; }
7125 protected override string RuntimeHandleName {
7126 get { return "RuntimeMethodHandle"; }
7129 protected override MethodInfo TypeFromHandle {
7131 return TypeManager.methodbase_get_type_from_handle;
7134 TypeManager.methodbase_get_type_from_handle = value;
7138 protected override MethodInfo TypeFromHandleGeneric {
7140 return TypeManager.methodbase_get_type_from_handle_generic;
7143 TypeManager.methodbase_get_type_from_handle_generic = value;
7147 protected override string TypeName {
7148 get { return "MethodBase"; }
7152 abstract class TypeOfMember : Expression
7154 protected readonly MemberInfo member;
7156 protected TypeOfMember (MemberInfo member, Location loc)
7158 this.member = member;
7162 public override Expression CreateExpressionTree (ResolveContext ec)
7164 Arguments args = new Arguments (2);
7165 args.Add (new Argument (this));
7166 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
7167 return CreateExpressionFactoryCall (ec, "Constant", args);
7170 protected override Expression DoResolve (ResolveContext ec)
7172 bool is_generic = TypeManager.IsGenericType (member.DeclaringType);
7173 MethodInfo mi = is_generic ? TypeFromHandleGeneric : TypeFromHandle;
7176 Type t = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", TypeName, Kind.Class, true);
7177 Type handle_type = TypeManager.CoreLookupType (ec.Compiler, "System", RuntimeHandleName, Kind.Class, true);
7179 if (t == null || handle_type == null)
7182 mi = TypeManager.GetPredefinedMethod (t, GetMethodName, loc,
7184 new Type[] { handle_type, TypeManager.runtime_handle_type } :
7185 new Type[] { handle_type } );
7188 TypeFromHandleGeneric = mi;
7190 TypeFromHandle = mi;
7193 eclass = ExprClass.Value;
7197 public override void Emit (EmitContext ec)
7199 bool is_generic = TypeManager.IsGenericType (member.DeclaringType);
7202 mi = TypeFromHandleGeneric;
7203 ec.ig.Emit (OpCodes.Ldtoken, member.DeclaringType);
7205 mi = TypeFromHandle;
7208 ec.ig.Emit (OpCodes.Call, mi);
7211 protected abstract string GetMethodName { get; }
7212 protected abstract string RuntimeHandleName { get; }
7213 protected abstract MethodInfo TypeFromHandle { get; set; }
7214 protected abstract MethodInfo TypeFromHandleGeneric { get; set; }
7215 protected abstract string TypeName { get; }
7218 class TypeOfField : TypeOfMember
7220 public TypeOfField (FieldInfo field, Location loc)
7225 protected override Expression DoResolve (ResolveContext ec)
7227 if (TypeManager.fieldinfo_type == null)
7228 TypeManager.fieldinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", TypeName, Kind.Class, true);
7230 type = TypeManager.fieldinfo_type;
7231 return base.DoResolve (ec);
7234 public override void Emit (EmitContext ec)
7236 ec.ig.Emit (OpCodes.Ldtoken, (FieldInfo) member);
7240 protected override string GetMethodName {
7241 get { return "GetFieldFromHandle"; }
7244 protected override string RuntimeHandleName {
7245 get { return "RuntimeFieldHandle"; }
7248 protected override MethodInfo TypeFromHandle {
7250 return TypeManager.fieldinfo_get_field_from_handle;
7253 TypeManager.fieldinfo_get_field_from_handle = value;
7257 protected override MethodInfo TypeFromHandleGeneric {
7259 return TypeManager.fieldinfo_get_field_from_handle_generic;
7262 TypeManager.fieldinfo_get_field_from_handle_generic = value;
7266 protected override string TypeName {
7267 get { return "FieldInfo"; }
7272 /// Implements the sizeof expression
7274 public class SizeOf : Expression {
7275 readonly Expression QueriedType;
7278 public SizeOf (Expression queried_type, Location l)
7280 this.QueriedType = queried_type;
7284 public override Expression CreateExpressionTree (ResolveContext ec)
7286 Error_PointerInsideExpressionTree (ec);
7290 protected override Expression DoResolve (ResolveContext ec)
7292 TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
7296 type_queried = texpr.Type;
7297 if (TypeManager.IsEnumType (type_queried))
7298 type_queried = TypeManager.GetEnumUnderlyingType (type_queried);
7300 int size_of = GetTypeSize (type_queried);
7302 return new IntConstant (size_of, loc).Resolve (ec);
7305 if (!TypeManager.VerifyUnmanaged (ec.Compiler, type_queried, loc)){
7310 ec.Report.Error (233, loc,
7311 "`{0}' does not have a predefined size, therefore sizeof can only be used in an unsafe context (consider using System.Runtime.InteropServices.Marshal.SizeOf)",
7312 TypeManager.CSharpName (type_queried));
7315 type = TypeManager.int32_type;
7316 eclass = ExprClass.Value;
7320 public override void Emit (EmitContext ec)
7322 ec.ig.Emit (OpCodes.Sizeof, type_queried);
7325 protected override void CloneTo (CloneContext clonectx, Expression t)
7331 /// Implements the qualified-alias-member (::) expression.
7333 public class QualifiedAliasMember : MemberAccess
7335 readonly string alias;
7336 public static readonly string GlobalAlias = "global";
7338 public QualifiedAliasMember (string alias, string identifier, TypeArguments targs, Location l)
7339 : base (null, identifier, targs, l)
7344 public QualifiedAliasMember (string alias, string identifier, Location l)
7345 : base (null, identifier, l)
7350 public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
7352 if (alias == GlobalAlias) {
7353 expr = GlobalRootNamespace.Instance;
7354 return base.ResolveAsTypeStep (ec, silent);
7357 int errors = ec.Compiler.Report.Errors;
7358 expr = ec.LookupNamespaceAlias (alias);
7360 if (errors == ec.Compiler.Report.Errors)
7361 ec.Compiler.Report.Error (432, loc, "Alias `{0}' not found", alias);
7365 FullNamedExpression fne = base.ResolveAsTypeStep (ec, silent);
7369 if (expr.eclass == ExprClass.Type) {
7371 ec.Compiler.Report.Error (431, loc,
7372 "Alias `{0}' cannot be used with '::' since it denotes a type. Consider replacing '::' with '.'", alias);
7380 protected override Expression DoResolve (ResolveContext ec)
7382 return ResolveAsTypeStep (ec, false);
7385 protected override void Error_IdentifierNotFound (IMemberContext rc, FullNamedExpression expr_type, string identifier)
7387 rc.Compiler.Report.Error (687, loc,
7388 "A namespace alias qualifier `{0}' did not resolve to a namespace or a type",
7389 GetSignatureForError ());
7392 public override string GetSignatureForError ()
7395 if (targs != null) {
7396 name = TypeManager.RemoveGenericArity (Name) + "<" +
7397 targs.GetSignatureForError () + ">";
7400 return alias + "::" + name;
7403 protected override void CloneTo (CloneContext clonectx, Expression t)
7410 /// Implements the member access expression
7412 public class MemberAccess : ATypeNameExpression {
7413 protected Expression expr;
7415 public MemberAccess (Expression expr, string id)
7416 : base (id, expr.Location)
7421 public MemberAccess (Expression expr, string identifier, Location loc)
7422 : base (identifier, loc)
7427 public MemberAccess (Expression expr, string identifier, TypeArguments args, Location loc)
7428 : base (identifier, args, loc)
7433 Expression DoResolve (ResolveContext ec, Expression right_side)
7436 throw new Exception ();
7439 // Resolve the expression with flow analysis turned off, we'll do the definite
7440 // assignment checks later. This is because we don't know yet what the expression
7441 // will resolve to - it may resolve to a FieldExpr and in this case we must do the
7442 // definite assignment check on the actual field and not on the whole struct.
7445 SimpleName original = expr as SimpleName;
7446 Expression expr_resolved;
7447 using (ec.Set (ResolveContext.Options.OmitStructFlowAnalysis)) {
7448 expr_resolved = expr.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.Type | ResolveFlags.Intermediate);
7451 if (expr_resolved == null)
7454 string LookupIdentifier = MemberName.MakeName (Name, targs);
7456 Namespace ns = expr_resolved as Namespace;
7458 FullNamedExpression retval = ns.Lookup (ec.Compiler, LookupIdentifier, loc);
7461 ns.Error_NamespaceDoesNotExist (loc, LookupIdentifier, ec);
7462 else if (targs != null)
7463 retval = new GenericTypeExpr (retval.Type, targs, loc).ResolveAsTypeStep (ec, false);
7468 Type expr_type = expr_resolved.Type;
7469 if (TypeManager.IsDynamicType (expr_type)) {
7470 Arguments args = new Arguments (1);
7471 args.Add (new Argument (expr_resolved.Resolve (ec)));
7472 expr = new DynamicMemberBinder (Name, args, loc);
7473 if (right_side != null)
7474 return expr.DoResolveLValue (ec, right_side);
7476 return expr.Resolve (ec);
7479 if (expr_type.IsPointer || expr_type == TypeManager.void_type ||
7480 expr_type == TypeManager.null_type || expr_type == InternalType.AnonymousMethod) {
7481 Unary.Error_OperatorCannotBeApplied (ec, loc, ".", expr_type);
7485 Constant c = expr_resolved as Constant;
7486 if (c != null && c.GetValue () == null) {
7487 ec.Report.Warning (1720, 1, loc, "Expression will always cause a `{0}'",
7488 "System.NullReferenceException");
7491 if (targs != null) {
7492 if (!targs.Resolve (ec))
7496 Expression member_lookup;
7497 member_lookup = MemberLookup (ec.Compiler,
7498 ec.CurrentType, expr_type, expr_type, Name, loc);
7500 if (member_lookup == null && targs != null) {
7501 member_lookup = MemberLookup (ec.Compiler,
7502 ec.CurrentType, expr_type, expr_type, LookupIdentifier, loc);
7505 if (member_lookup == null) {
7506 ExprClass expr_eclass = expr_resolved.eclass;
7509 // Extension methods are not allowed on all expression types
7511 if (expr_eclass == ExprClass.Value || expr_eclass == ExprClass.Variable ||
7512 expr_eclass == ExprClass.IndexerAccess || expr_eclass == ExprClass.PropertyAccess ||
7513 expr_eclass == ExprClass.EventAccess) {
7514 ExtensionMethodGroupExpr ex_method_lookup = ec.LookupExtensionMethod (expr_type, Name, loc);
7515 if (ex_method_lookup != null) {
7516 ex_method_lookup.ExtensionExpression = expr_resolved;
7518 if (targs != null) {
7519 ex_method_lookup.SetTypeArguments (ec, targs);
7522 return ex_method_lookup.Resolve (ec);
7526 expr = expr_resolved;
7527 member_lookup = Error_MemberLookupFailed (ec,
7528 ec.CurrentType, expr_type, expr_type, Name, null,
7529 AllMemberTypes, AllBindingFlags);
7530 if (member_lookup == null)
7534 TypeExpr texpr = member_lookup as TypeExpr;
7535 if (texpr != null) {
7536 if (!(expr_resolved is TypeExpr) &&
7537 (original == null || !original.IdenticalNameAndTypeName (ec, expr_resolved, loc))) {
7538 ec.Report.Error (572, loc, "`{0}': cannot reference a type through an expression; try `{1}' instead",
7539 Name, member_lookup.GetSignatureForError ());
7543 if (!texpr.CheckAccessLevel (ec.MemberContext)) {
7544 ec.Report.SymbolRelatedToPreviousError (member_lookup.Type);
7545 ErrorIsInaccesible (loc, TypeManager.CSharpName (member_lookup.Type), ec.Report);
7549 GenericTypeExpr ct = expr_resolved as GenericTypeExpr;
7552 // When looking up a nested type in a generic instance
7553 // via reflection, we always get a generic type definition
7554 // and not a generic instance - so we have to do this here.
7556 // See gtest-172-lib.cs and gtest-172.cs for an example.
7559 TypeArguments nested_targs;
7560 if (HasTypeArguments) {
7561 nested_targs = ct.TypeArguments.Clone ();
7562 nested_targs.Add (targs);
7564 nested_targs = ct.TypeArguments;
7567 ct = new GenericTypeExpr (member_lookup.Type, nested_targs, loc);
7569 return ct.ResolveAsTypeStep (ec, false);
7572 return member_lookup;
7575 MemberExpr me = (MemberExpr) member_lookup;
7576 me = me.ResolveMemberAccess (ec, expr_resolved, loc, original);
7580 if (targs != null) {
7581 me.SetTypeArguments (ec, targs);
7584 if (original != null && (!TypeManager.IsValueType (expr_type) || me is PropertyExpr)) {
7585 if (me.IsInstance) {
7586 LocalVariableReference var = expr_resolved as LocalVariableReference;
7587 if (var != null && !var.VerifyAssigned (ec))
7592 // The following DoResolve/DoResolveLValue will do the definite assignment
7595 if (right_side != null)
7596 return me.DoResolveLValue (ec, right_side);
7598 return me.Resolve (ec);
7601 protected override Expression DoResolve (ResolveContext ec)
7603 return DoResolve (ec, null);
7606 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
7608 return DoResolve (ec, right_side);
7611 public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
7613 return ResolveNamespaceOrType (ec, silent);
7616 public FullNamedExpression ResolveNamespaceOrType (IMemberContext rc, bool silent)
7618 FullNamedExpression expr_resolved = expr.ResolveAsTypeStep (rc, silent);
7620 if (expr_resolved == null)
7623 string LookupIdentifier = MemberName.MakeName (Name, targs);
7625 Namespace ns = expr_resolved as Namespace;
7627 FullNamedExpression retval = ns.Lookup (rc.Compiler, LookupIdentifier, loc);
7629 if (retval == null && !silent)
7630 ns.Error_NamespaceDoesNotExist (loc, LookupIdentifier, rc);
7631 else if (targs != null)
7632 retval = new GenericTypeExpr (retval.Type, targs, loc).ResolveAsTypeStep (rc, silent);
7637 TypeExpr tnew_expr = expr_resolved.ResolveAsTypeTerminal (rc, false);
7638 if (tnew_expr == null)
7641 Type expr_type = tnew_expr.Type;
7642 if (TypeManager.IsGenericParameter (expr_type)) {
7643 rc.Compiler.Report.Error (704, loc, "A nested type cannot be specified through a type parameter `{0}'",
7644 tnew_expr.GetSignatureForError ());
7648 Expression member_lookup = MemberLookup (rc.Compiler,
7649 rc.CurrentType, expr_type, expr_type, LookupIdentifier,
7650 MemberTypes.NestedType, BindingFlags.Public | BindingFlags.NonPublic, loc);
7651 if (member_lookup == null) {
7655 Error_IdentifierNotFound (rc, expr_resolved, LookupIdentifier);
7659 TypeExpr texpr = member_lookup.ResolveAsTypeTerminal (rc, false);
7663 TypeArguments the_args = targs;
7664 Type declaring_type = texpr.Type.DeclaringType;
7665 if (TypeManager.HasGenericArguments (declaring_type) && !TypeManager.IsGenericTypeDefinition (expr_type)) {
7666 while (!TypeManager.IsEqual (TypeManager.DropGenericTypeArguments (expr_type), declaring_type)) {
7667 expr_type = expr_type.BaseType;
7670 TypeArguments new_args = new TypeArguments ();
7671 foreach (Type decl in TypeManager.GetTypeArguments (expr_type))
7672 new_args.Add (new TypeExpression (TypeManager.TypeToCoreType (decl), loc));
7675 new_args.Add (targs);
7677 the_args = new_args;
7680 if (the_args != null) {
7681 GenericTypeExpr ctype = new GenericTypeExpr (texpr.Type, the_args, loc);
7682 return ctype.ResolveAsTypeStep (rc, false);
7688 protected virtual void Error_IdentifierNotFound (IMemberContext rc, FullNamedExpression expr_type, string identifier)
7690 Expression member_lookup = MemberLookup (rc.Compiler,
7691 rc.CurrentType, expr_type.Type, expr_type.Type, SimpleName.RemoveGenericArity (identifier),
7692 MemberTypes.NestedType, BindingFlags.Public | BindingFlags.NonPublic, loc);
7694 if (member_lookup != null) {
7695 expr_type = member_lookup.ResolveAsTypeTerminal (rc, false);
7696 if (expr_type == null)
7699 expr_type.Error_TypeArgumentsCannotBeUsed (rc.Compiler.Report, loc);
7703 member_lookup = MemberLookup (rc.Compiler,
7704 rc.CurrentType, expr_type.Type, expr_type.Type, identifier,
7705 MemberTypes.All, BindingFlags.Public | BindingFlags.NonPublic, loc);
7707 if (member_lookup == null) {
7708 rc.Compiler.Report.Error (426, loc, "The nested type `{0}' does not exist in the type `{1}'",
7709 Name, expr_type.GetSignatureForError ());
7711 // TODO: Report.SymbolRelatedToPreviousError
7712 member_lookup.Error_UnexpectedKind (rc.Compiler.Report, null, "type", loc);
7716 protected override void Error_TypeDoesNotContainDefinition (ResolveContext ec, Type type, string name)
7718 if (RootContext.Version > LanguageVersion.ISO_2 && !ec.Compiler.IsRuntimeBinder &&
7719 ((expr.eclass & (ExprClass.Value | ExprClass.Variable)) != 0)) {
7720 ec.Report.Error (1061, loc, "Type `{0}' does not contain a definition for `{1}' and no " +
7721 "extension method `{1}' of type `{0}' could be found " +
7722 "(are you missing a using directive or an assembly reference?)",
7723 TypeManager.CSharpName (type), name);
7727 base.Error_TypeDoesNotContainDefinition (ec, type, name);
7730 public override string GetSignatureForError ()
7732 return expr.GetSignatureForError () + "." + base.GetSignatureForError ();
7735 public Expression Left {
7741 protected override void CloneTo (CloneContext clonectx, Expression t)
7743 MemberAccess target = (MemberAccess) t;
7745 target.expr = expr.Clone (clonectx);
7750 /// Implements checked expressions
7752 public class CheckedExpr : Expression {
7754 public Expression Expr;
7756 public CheckedExpr (Expression e, Location l)
7762 public override Expression CreateExpressionTree (ResolveContext ec)
7764 using (ec.With (ResolveContext.Options.AllCheckStateFlags, true))
7765 return Expr.CreateExpressionTree (ec);
7768 protected override Expression DoResolve (ResolveContext ec)
7770 using (ec.With (ResolveContext.Options.AllCheckStateFlags, true))
7771 Expr = Expr.Resolve (ec);
7776 if (Expr is Constant || Expr is MethodGroupExpr || Expr is AnonymousMethodExpression || Expr is DefaultValueExpression)
7779 eclass = Expr.eclass;
7784 public override void Emit (EmitContext ec)
7786 using (ec.With (EmitContext.Options.AllCheckStateFlags, true))
7790 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
7792 using (ec.With (EmitContext.Options.AllCheckStateFlags, true))
7793 Expr.EmitBranchable (ec, target, on_true);
7797 public override SLE.Expression MakeExpression (BuilderContext ctx)
7799 using (ctx.With (BuilderContext.Options.AllCheckStateFlags, true)) {
7800 return Expr.MakeExpression (ctx);
7805 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
7807 Expr.MutateHoistedGenericType (storey);
7810 protected override void CloneTo (CloneContext clonectx, Expression t)
7812 CheckedExpr target = (CheckedExpr) t;
7814 target.Expr = Expr.Clone (clonectx);
7819 /// Implements the unchecked expression
7821 public class UnCheckedExpr : Expression {
7823 public Expression Expr;
7825 public UnCheckedExpr (Expression e, Location l)
7831 public override Expression CreateExpressionTree (ResolveContext ec)
7833 using (ec.With (ResolveContext.Options.AllCheckStateFlags, false))
7834 return Expr.CreateExpressionTree (ec);
7837 protected override Expression DoResolve (ResolveContext ec)
7839 using (ec.With (ResolveContext.Options.AllCheckStateFlags, false))
7840 Expr = Expr.Resolve (ec);
7845 if (Expr is Constant || Expr is MethodGroupExpr || Expr is AnonymousMethodExpression || Expr is DefaultValueExpression)
7848 eclass = Expr.eclass;
7853 public override void Emit (EmitContext ec)
7855 using (ec.With (EmitContext.Options.AllCheckStateFlags, false))
7859 public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
7861 using (ec.With (EmitContext.Options.AllCheckStateFlags, false))
7862 Expr.EmitBranchable (ec, target, on_true);
7865 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
7867 Expr.MutateHoistedGenericType (storey);
7870 protected override void CloneTo (CloneContext clonectx, Expression t)
7872 UnCheckedExpr target = (UnCheckedExpr) t;
7874 target.Expr = Expr.Clone (clonectx);
7879 /// An Element Access expression.
7881 /// During semantic analysis these are transformed into
7882 /// IndexerAccess, ArrayAccess or a PointerArithmetic.
7884 public class ElementAccess : Expression {
7885 public Arguments Arguments;
7886 public Expression Expr;
7888 public ElementAccess (Expression e, Arguments args)
7892 this.Arguments = args;
7895 public override Expression CreateExpressionTree (ResolveContext ec)
7897 Arguments args = Arguments.CreateForExpressionTree (ec, Arguments,
7898 Expr.CreateExpressionTree (ec));
7900 return CreateExpressionFactoryCall (ec, "ArrayIndex", args);
7903 Expression MakePointerAccess (ResolveContext ec, Type t)
7905 if (Arguments.Count != 1){
7906 ec.Report.Error (196, loc, "A pointer must be indexed by only one value");
7910 if (Arguments [0] is NamedArgument)
7911 Error_NamedArgument ((NamedArgument) Arguments[0], ec.Report);
7913 Expression p = new PointerArithmetic (Binary.Operator.Addition, Expr, Arguments [0].Expr.Resolve (ec), t, loc);
7914 return new Indirection (p, loc).Resolve (ec);
7917 protected override Expression DoResolve (ResolveContext ec)
7919 Expr = Expr.Resolve (ec);
7924 // We perform some simple tests, and then to "split" the emit and store
7925 // code we create an instance of a different class, and return that.
7927 // I am experimenting with this pattern.
7931 if (t == TypeManager.array_type){
7932 ec.Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `System.Array'");
7937 return (new ArrayAccess (this, loc)).Resolve (ec);
7939 return MakePointerAccess (ec, t);
7941 FieldExpr fe = Expr as FieldExpr;
7943 IFixedBuffer ff = AttributeTester.GetFixedBuffer (fe.FieldInfo);
7945 return MakePointerAccess (ec, ff.ElementType);
7948 return (new IndexerAccess (this, loc)).Resolve (ec);
7951 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
7953 Expr = Expr.Resolve (ec);
7959 return (new ArrayAccess (this, loc)).DoResolveLValue (ec, right_side);
7962 return MakePointerAccess (ec, type);
7964 if (Expr.eclass != ExprClass.Variable && TypeManager.IsStruct (type))
7965 Error_CannotModifyIntermediateExpressionValue (ec);
7967 return (new IndexerAccess (this, loc)).DoResolveLValue (ec, right_side);
7970 public override void Emit (EmitContext ec)
7972 throw new Exception ("Should never be reached");
7975 public static void Error_NamedArgument (NamedArgument na, Report Report)
7977 Report.Error (1742, na.Location, "An element access expression cannot use named argument");
7980 public override string GetSignatureForError ()
7982 return Expr.GetSignatureForError ();
7985 protected override void CloneTo (CloneContext clonectx, Expression t)
7987 ElementAccess target = (ElementAccess) t;
7989 target.Expr = Expr.Clone (clonectx);
7990 if (Arguments != null)
7991 target.Arguments = Arguments.Clone (clonectx);
7996 /// Implements array access
7998 public class ArrayAccess : Expression, IDynamicAssign, IMemoryLocation {
8000 // Points to our "data" repository
8004 LocalTemporary temp;
8008 public ArrayAccess (ElementAccess ea_data, Location l)
8014 public override Expression CreateExpressionTree (ResolveContext ec)
8016 return ea.CreateExpressionTree (ec);
8019 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
8021 return DoResolve (ec);
8024 protected override Expression DoResolve (ResolveContext ec)
8026 // dynamic is used per argument in ConvertExpressionToArrayIndex case
8028 ea.Arguments.Resolve (ec, out dynamic);
8030 Type t = ea.Expr.Type;
8031 int rank = ea.Arguments.Count;
8032 if (t.GetArrayRank () != rank) {
8033 ec.Report.Error (22, ea.Location, "Wrong number of indexes `{0}' inside [], expected `{1}'",
8034 ea.Arguments.Count.ToString (), t.GetArrayRank ().ToString ());
8038 type = TypeManager.GetElementType (t);
8039 if (type.IsPointer && !ec.IsUnsafe) {
8040 UnsafeError (ec, ea.Location);
8043 foreach (Argument a in ea.Arguments) {
8044 if (a is NamedArgument)
8045 ElementAccess.Error_NamedArgument ((NamedArgument) a, ec.Report);
8047 a.Expr = ConvertExpressionToArrayIndex (ec, a.Expr);
8050 eclass = ExprClass.Variable;
8056 /// Emits the right opcode to load an object of Type `t'
8057 /// from an array of T
8059 void EmitLoadOpcode (ILGenerator ig, Type type, int rank)
8062 MethodInfo get = FetchGetMethod ();
8063 ig.Emit (OpCodes.Call, get);
8067 if (type == TypeManager.byte_type || type == TypeManager.bool_type)
8068 ig.Emit (OpCodes.Ldelem_U1);
8069 else if (type == TypeManager.sbyte_type)
8070 ig.Emit (OpCodes.Ldelem_I1);
8071 else if (type == TypeManager.short_type)
8072 ig.Emit (OpCodes.Ldelem_I2);
8073 else if (type == TypeManager.ushort_type || type == TypeManager.char_type)
8074 ig.Emit (OpCodes.Ldelem_U2);
8075 else if (type == TypeManager.int32_type)
8076 ig.Emit (OpCodes.Ldelem_I4);
8077 else if (type == TypeManager.uint32_type)
8078 ig.Emit (OpCodes.Ldelem_U4);
8079 else if (type == TypeManager.uint64_type)
8080 ig.Emit (OpCodes.Ldelem_I8);
8081 else if (type == TypeManager.int64_type)
8082 ig.Emit (OpCodes.Ldelem_I8);
8083 else if (type == TypeManager.float_type)
8084 ig.Emit (OpCodes.Ldelem_R4);
8085 else if (type == TypeManager.double_type)
8086 ig.Emit (OpCodes.Ldelem_R8);
8087 else if (type == TypeManager.intptr_type)
8088 ig.Emit (OpCodes.Ldelem_I);
8089 else if (TypeManager.IsEnumType (type)){
8090 EmitLoadOpcode (ig, TypeManager.GetEnumUnderlyingType (type), rank);
8091 } else if (TypeManager.IsStruct (type)){
8092 ig.Emit (OpCodes.Ldelema, type);
8093 ig.Emit (OpCodes.Ldobj, type);
8094 } else if (type.IsGenericParameter) {
8095 ig.Emit (OpCodes.Ldelem, type);
8096 } else if (type.IsPointer)
8097 ig.Emit (OpCodes.Ldelem_I);
8099 ig.Emit (OpCodes.Ldelem_Ref);
8102 protected override void Error_NegativeArrayIndex (ResolveContext ec, Location loc)
8104 ec.Report.Warning (251, 2, loc, "Indexing an array with a negative index (array indices always start at zero)");
8108 /// Returns the right opcode to store an object of Type `t'
8109 /// from an array of T.
8111 static public OpCode GetStoreOpcode (Type t, out bool is_stobj, out bool has_type_arg)
8113 has_type_arg = false; is_stobj = false;
8114 t = TypeManager.TypeToCoreType (t);
8115 if (TypeManager.IsEnumType (t))
8116 t = TypeManager.GetEnumUnderlyingType (t);
8117 if (t == TypeManager.byte_type || t == TypeManager.sbyte_type ||
8118 t == TypeManager.bool_type)
8119 return OpCodes.Stelem_I1;
8120 else if (t == TypeManager.short_type || t == TypeManager.ushort_type ||
8121 t == TypeManager.char_type)
8122 return OpCodes.Stelem_I2;
8123 else if (t == TypeManager.int32_type || t == TypeManager.uint32_type)
8124 return OpCodes.Stelem_I4;
8125 else if (t == TypeManager.int64_type || t == TypeManager.uint64_type)
8126 return OpCodes.Stelem_I8;
8127 else if (t == TypeManager.float_type)
8128 return OpCodes.Stelem_R4;
8129 else if (t == TypeManager.double_type)
8130 return OpCodes.Stelem_R8;
8131 else if (t == TypeManager.intptr_type) {
8132 has_type_arg = true;
8134 return OpCodes.Stobj;
8135 } else if (TypeManager.IsStruct (t)) {
8136 has_type_arg = true;
8138 return OpCodes.Stobj;
8139 } else if (t.IsGenericParameter) {
8140 has_type_arg = true;
8141 return OpCodes.Stelem;
8142 } else if (t.IsPointer)
8143 return OpCodes.Stelem_I;
8145 return OpCodes.Stelem_Ref;
8148 MethodInfo FetchGetMethod ()
8150 ModuleBuilder mb = RootContext.ToplevelTypes.Builder;
8151 int arg_count = ea.Arguments.Count;
8152 Type [] args = new Type [arg_count];
8155 for (int i = 0; i < arg_count; i++){
8156 //args [i++] = a.Type;
8157 args [i] = TypeManager.int32_type;
8160 get = mb.GetArrayMethod (
8161 ea.Expr.Type, "Get",
8162 CallingConventions.HasThis |
8163 CallingConventions.Standard,
8169 MethodInfo FetchAddressMethod ()
8171 ModuleBuilder mb = RootContext.ToplevelTypes.Builder;
8172 int arg_count = ea.Arguments.Count;
8173 Type [] args = new Type [arg_count];
8177 ret_type = TypeManager.GetReferenceType (type);
8179 for (int i = 0; i < arg_count; i++){
8180 //args [i++] = a.Type;
8181 args [i] = TypeManager.int32_type;
8184 address = mb.GetArrayMethod (
8185 ea.Expr.Type, "Address",
8186 CallingConventions.HasThis |
8187 CallingConventions.Standard,
8194 // Load the array arguments into the stack.
8196 void LoadArrayAndArguments (EmitContext ec)
8200 for (int i = 0; i < ea.Arguments.Count; ++i) {
8201 ea.Arguments [i].Emit (ec);
8205 public void Emit (EmitContext ec, bool leave_copy)
8207 int rank = ea.Expr.Type.GetArrayRank ();
8208 ILGenerator ig = ec.ig;
8211 LoadFromPtr (ig, this.type);
8213 LoadArrayAndArguments (ec);
8214 EmitLoadOpcode (ig, type, rank);
8218 ig.Emit (OpCodes.Dup);
8219 temp = new LocalTemporary (this.type);
8224 public override void Emit (EmitContext ec)
8229 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
8231 int rank = ea.Expr.Type.GetArrayRank ();
8232 ILGenerator ig = ec.ig;
8233 Type t = source.Type;
8234 prepared = prepare_for_load;
8237 AddressOf (ec, AddressOp.LoadStore);
8238 ec.ig.Emit (OpCodes.Dup);
8240 LoadArrayAndArguments (ec);
8244 bool is_stobj, has_type_arg;
8245 OpCode op = GetStoreOpcode (t, out is_stobj, out has_type_arg);
8249 // The stobj opcode used by value types will need
8250 // an address on the stack, not really an array/array
8254 ig.Emit (OpCodes.Ldelema, t);
8259 ec.ig.Emit (OpCodes.Dup);
8260 temp = new LocalTemporary (this.type);
8265 StoreFromPtr (ig, t);
8267 ig.Emit (OpCodes.Stobj, t);
8268 else if (has_type_arg)
8275 ec.ig.Emit (OpCodes.Dup);
8276 temp = new LocalTemporary (this.type);
8281 StoreFromPtr (ig, t);
8283 int arg_count = ea.Arguments.Count;
8284 Type [] args = new Type [arg_count + 1];
8285 for (int i = 0; i < arg_count; i++) {
8286 //args [i++] = a.Type;
8287 args [i] = TypeManager.int32_type;
8289 args [arg_count] = type;
8291 MethodInfo set = RootContext.ToplevelTypes.Builder.GetArrayMethod (
8292 ea.Expr.Type, "Set",
8293 CallingConventions.HasThis |
8294 CallingConventions.Standard,
8295 TypeManager.void_type, args);
8297 ig.Emit (OpCodes.Call, set);
8307 public void EmitNew (EmitContext ec, New source, bool leave_copy)
8309 if (!source.Emit (ec, this)) {
8311 throw new NotImplementedException ();
8316 throw new NotImplementedException ();
8319 public void AddressOf (EmitContext ec, AddressOp mode)
8321 int rank = ea.Expr.Type.GetArrayRank ();
8322 ILGenerator ig = ec.ig;
8324 LoadArrayAndArguments (ec);
8327 ig.Emit (OpCodes.Ldelema, type);
8329 MethodInfo address = FetchAddressMethod ();
8330 ig.Emit (OpCodes.Call, address);
8335 public SLE.Expression MakeAssignExpression (BuilderContext ctx)
8337 return SLE.Expression.ArrayAccess (
8338 ea.Expr.MakeExpression (ctx),
8339 Arguments.MakeExpression (ea.Arguments, ctx));
8342 public override SLE.Expression MakeExpression (BuilderContext ctx)
8344 return SLE.Expression.ArrayIndex (
8345 ea.Expr.MakeExpression (ctx),
8346 Arguments.MakeExpression (ea.Arguments, ctx));
8350 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
8352 type = storey.MutateType (type);
8353 ea.Expr.Type = storey.MutateType (ea.Expr.Type);
8358 /// Expressions that represent an indexer call.
8360 public class IndexerAccess : Expression, IDynamicAssign
8362 class IndexerMethodGroupExpr : MethodGroupExpr
8364 public IndexerMethodGroupExpr (Indexers indexers, Location loc)
8367 Methods = indexers.Methods.ToArray ();
8370 public override string Name {
8376 protected override int GetApplicableParametersCount (MethodBase method, AParametersCollection parameters)
8379 // Here is the trick, decrease number of arguments by 1 when only
8380 // available property method is setter. This makes overload resolution
8381 // work correctly for indexers.
8384 if (method.Name [0] == 'g')
8385 return parameters.Count;
8387 return parameters.Count - 1;
8393 // Contains either property getter or setter
8394 public List<MethodBase> Methods;
8395 public List<PropertyInfo> Properties;
8401 void Append (Type caller_type, MemberInfo [] mi)
8406 foreach (PropertyInfo property in mi) {
8407 MethodInfo accessor = property.GetGetMethod (true);
8408 if (accessor == null)
8409 accessor = property.GetSetMethod (true);
8411 if (Methods == null) {
8412 Methods = new List<MethodBase> ();
8413 Properties = new List<PropertyInfo> ();
8416 Methods.Add (accessor);
8417 Properties.Add (property);
8421 static MemberInfo [] GetIndexersForTypeOrInterface (Type caller_type, Type lookup_type)
8423 string p_name = TypeManager.IndexerPropertyName (lookup_type);
8425 return TypeManager.MemberLookup (
8426 caller_type, caller_type, lookup_type, MemberTypes.Property,
8427 BindingFlags.Public | BindingFlags.Instance |
8428 BindingFlags.DeclaredOnly, p_name, null);
8431 public static Indexers GetIndexersForType (Type caller_type, Type lookup_type)
8433 Indexers ix = new Indexers ();
8435 if (TypeManager.IsGenericParameter (lookup_type)) {
8436 GenericConstraints gc = TypeManager.GetTypeParameterConstraints (lookup_type);
8440 if (gc.HasClassConstraint) {
8441 Type class_contraint = gc.ClassConstraint;
8442 while (class_contraint != TypeManager.object_type && class_contraint != null) {
8443 ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, class_contraint));
8444 class_contraint = class_contraint.BaseType;
8448 Type[] ifaces = gc.InterfaceConstraints;
8449 foreach (Type itype in ifaces)
8450 ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, itype));
8455 Type copy = lookup_type;
8456 while (copy != TypeManager.object_type && copy != null){
8457 ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, copy));
8458 copy = copy.BaseType;
8461 if (lookup_type.IsInterface) {
8462 Type [] ifaces = TypeManager.GetInterfaces (lookup_type);
8463 if (ifaces != null) {
8464 foreach (Type itype in ifaces)
8465 ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, itype));
8474 // Points to our "data" repository
8476 MethodInfo get, set;
8477 bool is_base_indexer;
8479 LocalTemporary temp;
8480 LocalTemporary prepared_value;
8481 Expression set_expr;
8483 protected Type indexer_type;
8484 protected Type current_type;
8485 protected Expression instance_expr;
8486 protected Arguments arguments;
8488 public IndexerAccess (ElementAccess ea, Location loc)
8489 : this (ea.Expr, false, loc)
8491 this.arguments = ea.Arguments;
8494 protected IndexerAccess (Expression instance_expr, bool is_base_indexer,
8497 this.instance_expr = instance_expr;
8498 this.is_base_indexer = is_base_indexer;
8502 static string GetAccessorName (bool isSet)
8504 return isSet ? "set" : "get";
8507 public override Expression CreateExpressionTree (ResolveContext ec)
8509 Arguments args = Arguments.CreateForExpressionTree (ec, arguments,
8510 instance_expr.CreateExpressionTree (ec),
8511 new TypeOfMethod (get, loc));
8513 return CreateExpressionFactoryCall (ec, "Call", args);
8516 protected virtual void CommonResolve (ResolveContext ec)
8518 indexer_type = instance_expr.Type;
8519 current_type = ec.CurrentType;
8522 protected override Expression DoResolve (ResolveContext ec)
8524 return ResolveAccessor (ec, null);
8527 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
8529 if (right_side == EmptyExpression.OutAccess.Instance) {
8530 right_side.DoResolveLValue (ec, this);
8534 // if the indexer returns a value type, and we try to set a field in it
8535 if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess) {
8536 Error_CannotModifyIntermediateExpressionValue (ec);
8539 return ResolveAccessor (ec, right_side);
8542 Expression ResolveAccessor (ResolveContext ec, Expression right_side)
8550 arguments.Resolve (ec, out dynamic);
8552 if (TypeManager.IsDynamicType (indexer_type)) {
8557 ilist = Indexers.GetIndexersForType (current_type, indexer_type);
8558 if (ilist.Methods == null) {
8559 ec.Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `{0}'",
8560 TypeManager.CSharpName (indexer_type));
8564 mg = new IndexerMethodGroupExpr (ilist, loc);
8565 mg = mg.OverloadResolve (ec, ref arguments, false, loc);
8571 Arguments args = new Arguments (arguments.Count + 1);
8572 if (is_base_indexer) {
8573 ec.Report.Error (1972, loc, "The indexer base access cannot be dynamically dispatched. Consider casting the dynamic arguments or eliminating the base access");
8575 args.Add (new Argument (instance_expr));
8577 args.AddRange (arguments);
8579 var expr = new DynamicIndexBinder (args, loc);
8580 if (right_side != null)
8581 return expr.ResolveLValue (ec, right_side);
8583 return expr.Resolve (ec);
8586 MethodInfo mi = (MethodInfo) mg;
8587 PropertyInfo pi = null;
8588 for (int i = 0; i < ilist.Methods.Count; ++i) {
8589 if (ilist.Methods [i] == mi) {
8590 pi = (PropertyInfo) ilist.Properties [i];
8595 type = TypeManager.TypeToCoreType (pi.PropertyType);
8596 if (type.IsPointer && !ec.IsUnsafe)
8597 UnsafeError (ec, loc);
8599 MethodInfo accessor;
8600 if (right_side == null) {
8601 accessor = get = pi.GetGetMethod (true);
8603 accessor = set = pi.GetSetMethod (true);
8604 if (accessor == null && pi.GetGetMethod (true) != null) {
8605 ec.Report.SymbolRelatedToPreviousError (pi);
8606 ec.Report.Error (200, loc, "The read only property or indexer `{0}' cannot be assigned to",
8607 TypeManager.GetFullNameSignature (pi));
8611 set_expr = Convert.ImplicitConversion (ec, right_side, type, loc);
8614 if (accessor == null) {
8615 ec.Report.SymbolRelatedToPreviousError (pi);
8616 ec.Report.Error (154, loc, "The property or indexer `{0}' cannot be used in this context because it lacks a `{1}' accessor",
8617 TypeManager.GetFullNameSignature (pi), GetAccessorName (right_side != null));
8622 // Only base will allow this invocation to happen.
8624 if (accessor.IsAbstract && this is BaseIndexerAccess) {
8625 Error_CannotCallAbstractBase (ec, TypeManager.GetFullNameSignature (pi));
8628 bool must_do_cs1540_check;
8629 if (!IsAccessorAccessible (ec.CurrentType, accessor, out must_do_cs1540_check)) {
8631 set = pi.GetSetMethod (true);
8633 get = pi.GetGetMethod (true);
8635 if (set != null && get != null &&
8636 (set.Attributes & MethodAttributes.MemberAccessMask) != (get.Attributes & MethodAttributes.MemberAccessMask)) {
8637 ec.Report.SymbolRelatedToPreviousError (accessor);
8638 ec.Report.Error (271, loc, "The property or indexer `{0}' cannot be used in this context because a `{1}' accessor is inaccessible",
8639 TypeManager.GetFullNameSignature (pi), GetAccessorName (right_side != null));
8641 ec.Report.SymbolRelatedToPreviousError (pi);
8642 ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (pi), ec.Report);
8646 instance_expr.CheckMarshalByRefAccess (ec);
8647 eclass = ExprClass.IndexerAccess;
8651 public override void Emit (EmitContext ec)
8656 public void Emit (EmitContext ec, bool leave_copy)
8659 prepared_value.Emit (ec);
8661 Invocation.EmitCall (ec, is_base_indexer, instance_expr, get,
8662 arguments, loc, false, false);
8666 ec.ig.Emit (OpCodes.Dup);
8667 temp = new LocalTemporary (Type);
8673 // source is ignored, because we already have a copy of it from the
8674 // LValue resolution and we have already constructed a pre-cached
8675 // version of the arguments (ea.set_arguments);
8677 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
8679 prepared = prepare_for_load;
8680 Expression value = set_expr;
8683 Invocation.EmitCall (ec, is_base_indexer, instance_expr, get,
8684 arguments, loc, true, false);
8686 prepared_value = new LocalTemporary (type);
8687 prepared_value.Store (ec);
8689 prepared_value.Release (ec);
8692 ec.ig.Emit (OpCodes.Dup);
8693 temp = new LocalTemporary (Type);
8696 } else if (leave_copy) {
8697 temp = new LocalTemporary (Type);
8704 arguments.Add (new Argument (value));
8706 Invocation.EmitCall (ec, is_base_indexer, instance_expr, set, arguments, loc, false, prepared);
8714 public override string GetSignatureForError ()
8716 return TypeManager.CSharpSignature (get != null ? get : set, false);
8720 public SLE.Expression MakeAssignExpression (BuilderContext ctx)
8722 var value = new[] { set_expr.MakeExpression (ctx) };
8723 var args = Arguments.MakeExpression (arguments, ctx).Concat (value);
8725 return SLE.Expression.Block (
8726 SLE.Expression.Call (instance_expr.MakeExpression (ctx), set, args),
8730 public override SLE.Expression MakeExpression (BuilderContext ctx)
8732 var args = Arguments.MakeExpression (arguments, ctx);
8733 return SLE.Expression.Call (instance_expr.MakeExpression (ctx), get, args);
8737 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
8740 get = storey.MutateGenericMethod (get);
8742 set = storey.MutateGenericMethod (set);
8744 instance_expr.MutateHoistedGenericType (storey);
8745 if (arguments != null)
8746 arguments.MutateHoistedGenericType (storey);
8748 type = storey.MutateType (type);
8751 protected override void CloneTo (CloneContext clonectx, Expression t)
8753 IndexerAccess target = (IndexerAccess) t;
8755 if (arguments != null)
8756 target.arguments = arguments.Clone (clonectx);
8758 if (instance_expr != null)
8759 target.instance_expr = instance_expr.Clone (clonectx);
8764 /// The base operator for method names
8766 public class BaseAccess : Expression {
8767 public readonly string Identifier;
8770 public BaseAccess (string member, Location l)
8772 this.Identifier = member;
8776 public BaseAccess (string member, TypeArguments args, Location l)
8782 public override Expression CreateExpressionTree (ResolveContext ec)
8784 throw new NotSupportedException ("ET");
8787 protected override Expression DoResolve (ResolveContext ec)
8789 Expression c = CommonResolve (ec);
8795 // MethodGroups use this opportunity to flag an error on lacking ()
8797 if (!(c is MethodGroupExpr))
8798 return c.Resolve (ec);
8802 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
8804 Expression c = CommonResolve (ec);
8810 // MethodGroups use this opportunity to flag an error on lacking ()
8812 if (! (c is MethodGroupExpr))
8813 return c.DoResolveLValue (ec, right_side);
8818 Expression CommonResolve (ResolveContext ec)
8820 Expression member_lookup;
8821 Type current_type = ec.CurrentType;
8822 Type base_type = current_type.BaseType;
8824 if (!This.IsThisAvailable (ec)) {
8826 ec.Report.Error (1511, loc, "Keyword `base' is not available in a static method");
8828 ec.Report.Error (1512, loc, "Keyword `base' is not available in the current context");
8833 member_lookup = MemberLookup (ec.Compiler, ec.CurrentType, null, base_type, Identifier,
8834 AllMemberTypes, AllBindingFlags, loc);
8835 if (member_lookup == null) {
8836 Error_MemberLookupFailed (ec, ec.CurrentType, base_type, base_type, Identifier,
8837 null, AllMemberTypes, AllBindingFlags);
8844 left = new TypeExpression (base_type, loc);
8846 left = ec.GetThis (loc);
8848 MemberExpr me = member_lookup as MemberExpr;
8850 if (member_lookup is TypeExpression){
8851 ec.Report.Error (582, loc, "{0}: Can not reference a type through an expression, try `{1}' instead",
8852 Identifier, member_lookup.GetSignatureForError ());
8854 ec.Report.Error (582, loc, "{0}: Can not reference a {1} through an expression",
8855 Identifier, member_lookup.ExprClassName);
8861 me = me.ResolveMemberAccess (ec, left, loc, null);
8868 me.SetTypeArguments (ec, args);
8874 public override void Emit (EmitContext ec)
8876 throw new Exception ("Should never be called");
8879 protected override void CloneTo (CloneContext clonectx, Expression t)
8881 BaseAccess target = (BaseAccess) t;
8884 target.args = args.Clone ();
8889 /// The base indexer operator
8891 public class BaseIndexerAccess : IndexerAccess {
8892 public BaseIndexerAccess (Arguments args, Location loc)
8893 : base (null, true, loc)
8895 this.arguments = args;
8898 protected override void CommonResolve (ResolveContext ec)
8900 instance_expr = ec.GetThis (loc);
8902 current_type = ec.CurrentType.BaseType;
8903 indexer_type = current_type;
8906 public override Expression CreateExpressionTree (ResolveContext ec)
8908 MemberExpr.Error_BaseAccessInExpressionTree (ec, loc);
8909 return base.CreateExpressionTree (ec);
8914 /// This class exists solely to pass the Type around and to be a dummy
8915 /// that can be passed to the conversion functions (this is used by
8916 /// foreach implementation to typecast the object return value from
8917 /// get_Current into the proper type. All code has been generated and
8918 /// we only care about the side effect conversions to be performed
8920 /// This is also now used as a placeholder where a no-action expression
8921 /// is needed (the `New' class).
8923 public class EmptyExpression : Expression {
8924 public static readonly Expression Null = new EmptyExpression ();
8926 public class OutAccess : EmptyExpression
8928 public static readonly OutAccess Instance = new OutAccess ();
8930 public override Expression DoResolveLValue (ResolveContext rc, Expression right_side)
8932 rc.Report.Error (206, right_side.Location,
8933 "A property, indexer or dynamic member access may not be passed as `ref' or `out' parameter");
8939 public static readonly EmptyExpression LValueMemberAccess = new EmptyExpression ();
8940 public static readonly EmptyExpression LValueMemberOutAccess = new EmptyExpression ();
8941 public static readonly EmptyExpression UnaryAddress = new EmptyExpression ();
8943 static EmptyExpression temp = new EmptyExpression ();
8944 public static EmptyExpression Grab ()
8946 EmptyExpression retval = temp == null ? new EmptyExpression () : temp;
8951 public static void Release (EmptyExpression e)
8958 // FIXME: Don't set to object
8959 type = TypeManager.object_type;
8960 eclass = ExprClass.Value;
8961 loc = Location.Null;
8964 public EmptyExpression (Type t)
8967 eclass = ExprClass.Value;
8968 loc = Location.Null;
8971 public override Expression CreateExpressionTree (ResolveContext ec)
8973 throw new NotSupportedException ("ET");
8976 protected override Expression DoResolve (ResolveContext ec)
8981 public override void Emit (EmitContext ec)
8983 // nothing, as we only exist to not do anything.
8986 public override void EmitSideEffect (EmitContext ec)
8991 // This is just because we might want to reuse this bad boy
8992 // instead of creating gazillions of EmptyExpressions.
8993 // (CanImplicitConversion uses it)
8995 public void SetType (Type t)
9002 // Empty statement expression
9004 public sealed class EmptyExpressionStatement : ExpressionStatement
9006 public static readonly EmptyExpressionStatement Instance = new EmptyExpressionStatement ();
9008 private EmptyExpressionStatement ()
9010 loc = Location.Null;
9013 public override Expression CreateExpressionTree (ResolveContext ec)
9018 public override void EmitStatement (EmitContext ec)
9023 protected override Expression DoResolve (ResolveContext ec)
9025 eclass = ExprClass.Value;
9026 type = TypeManager.object_type;
9030 public override void Emit (EmitContext ec)
9036 public class UserCast : Expression {
9040 public UserCast (MethodInfo method, Expression source, Location l)
9042 this.method = method;
9043 this.source = source;
9044 type = TypeManager.TypeToCoreType (method.ReturnType);
9048 public Expression Source {
9054 public override Expression CreateExpressionTree (ResolveContext ec)
9056 Arguments args = new Arguments (3);
9057 args.Add (new Argument (source.CreateExpressionTree (ec)));
9058 args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
9059 args.Add (new Argument (new TypeOfMethod (method, loc)));
9060 return CreateExpressionFactoryCall (ec, "Convert", args);
9063 protected override Expression DoResolve (ResolveContext ec)
9065 ObsoleteAttribute oa = AttributeTester.GetMethodObsoleteAttribute (method);
9067 AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, ec.Report);
9069 eclass = ExprClass.Value;
9073 public override void Emit (EmitContext ec)
9076 ec.ig.Emit (OpCodes.Call, method);
9079 public override string GetSignatureForError ()
9081 return TypeManager.CSharpSignature (method);
9085 public override SLE.Expression MakeExpression (BuilderContext ctx)
9087 return SLE.Expression.Convert (source.MakeExpression (ctx), type, method);
9091 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
9093 source.MutateHoistedGenericType (storey);
9094 method = storey.MutateGenericMethod (method);
9099 // This class is used to "construct" the type during a typecast
9100 // operation. Since the Type.GetType class in .NET can parse
9101 // the type specification, we just use this to construct the type
9102 // one bit at a time.
9104 public class ComposedCast : TypeExpr {
9105 FullNamedExpression left;
9108 public ComposedCast (FullNamedExpression left, string dim)
9109 : this (left, dim, left.Location)
9113 public ComposedCast (FullNamedExpression left, string dim, Location l)
9120 protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
9122 TypeExpr lexpr = left.ResolveAsTypeTerminal (ec, false);
9126 Type ltype = lexpr.Type;
9127 if ((dim.Length > 0) && (dim [0] == '?')) {
9128 TypeExpr nullable = new Nullable.NullableType (lexpr, loc);
9130 nullable = new ComposedCast (nullable, dim.Substring (1), loc);
9131 return nullable.ResolveAsTypeTerminal (ec, false);
9134 if (dim == "*" && !TypeManager.VerifyUnmanaged (ec.Compiler, ltype, loc))
9137 if (dim.Length != 0 && dim [0] == '[') {
9138 if (TypeManager.IsSpecialType (ltype)) {
9139 ec.Compiler.Report.Error (611, loc, "Array elements cannot be of type `{0}'", TypeManager.CSharpName (ltype));
9143 if ((ltype.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
9144 ec.Compiler.Report.SymbolRelatedToPreviousError (ltype);
9145 ec.Compiler.Report.Error (719, loc, "Array elements cannot be of static type `{0}'",
9146 TypeManager.CSharpName (ltype));
9151 type = TypeManager.GetConstructedType (ltype, dim);
9156 throw new InternalErrorException ("Couldn't create computed type " + ltype + dim);
9158 if (type.IsPointer && !ec.IsUnsafe){
9159 UnsafeError (ec.Compiler.Report, loc);
9162 eclass = ExprClass.Type;
9166 public override string GetSignatureForError ()
9168 return left.GetSignatureForError () + dim;
9171 public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
9173 return ResolveAsBaseTerminal (ec, silent);
9177 public class FixedBufferPtr : Expression {
9180 public FixedBufferPtr (Expression array, Type array_type, Location l)
9185 type = TypeManager.GetPointerType (array_type);
9186 eclass = ExprClass.Value;
9189 public override Expression CreateExpressionTree (ResolveContext ec)
9191 Error_PointerInsideExpressionTree (ec);
9195 public override void Emit(EmitContext ec)
9200 protected override Expression DoResolve (ResolveContext ec)
9203 // We are born fully resolved
9211 // This class is used to represent the address of an array, used
9212 // only by the Fixed statement, this generates "&a [0]" construct
9213 // for fixed (char *pa = a)
9215 public class ArrayPtr : FixedBufferPtr {
9218 public ArrayPtr (Expression array, Type array_type, Location l):
9219 base (array, array_type, l)
9221 this.array_type = array_type;
9224 public override void Emit (EmitContext ec)
9228 ILGenerator ig = ec.ig;
9229 IntLiteral.EmitInt (ig, 0);
9230 ig.Emit (OpCodes.Ldelema, array_type);
9235 // Encapsulates a conversion rules required for array indexes
9237 public class ArrayIndexCast : TypeCast
9239 public ArrayIndexCast (Expression expr)
9240 : base (expr, TypeManager.int32_type)
9242 if (expr.Type == TypeManager.int32_type)
9243 throw new ArgumentException ("unnecessary array index conversion");
9246 public override Expression CreateExpressionTree (ResolveContext ec)
9248 using (ec.Set (ResolveContext.Options.CheckedScope)) {
9249 return base.CreateExpressionTree (ec);
9253 public override void Emit (EmitContext ec)
9257 var expr_type = child.Type;
9259 if (expr_type == TypeManager.uint32_type)
9260 ec.ig.Emit (OpCodes.Conv_U);
9261 else if (expr_type == TypeManager.int64_type)
9262 ec.ig.Emit (OpCodes.Conv_Ovf_I);
9263 else if (expr_type == TypeManager.uint64_type)
9264 ec.ig.Emit (OpCodes.Conv_Ovf_I_Un);
9266 throw new InternalErrorException ("Cannot emit cast to unknown array element type", type);
9269 public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
9271 return child.GetAttributableValue (ec, value_type, out value);
9276 // Implements the `stackalloc' keyword
9278 public class StackAlloc : Expression {
9283 public StackAlloc (Expression type, Expression count, Location l)
9290 public override Expression CreateExpressionTree (ResolveContext ec)
9292 throw new NotSupportedException ("ET");
9295 protected override Expression DoResolve (ResolveContext ec)
9297 count = count.Resolve (ec);
9301 if (count.Type != TypeManager.uint32_type){
9302 count = Convert.ImplicitConversionRequired (ec, count, TypeManager.int32_type, loc);
9307 Constant c = count as Constant;
9308 if (c != null && c.IsNegative) {
9309 ec.Report.Error (247, loc, "Cannot use a negative size with stackalloc");
9312 if (ec.HasAny (ResolveContext.Options.CatchScope | ResolveContext.Options.FinallyScope)) {
9313 ec.Report.Error (255, loc, "Cannot use stackalloc in finally or catch");
9316 TypeExpr texpr = t.ResolveAsTypeTerminal (ec, false);
9322 if (!TypeManager.VerifyUnmanaged (ec.Compiler, otype, loc))
9325 type = TypeManager.GetPointerType (otype);
9326 eclass = ExprClass.Value;
9331 public override void Emit (EmitContext ec)
9333 int size = GetTypeSize (otype);
9334 ILGenerator ig = ec.ig;
9339 ig.Emit (OpCodes.Sizeof, otype);
9341 IntConstant.EmitInt (ig, size);
9343 ig.Emit (OpCodes.Mul_Ovf_Un);
9344 ig.Emit (OpCodes.Localloc);
9347 protected override void CloneTo (CloneContext clonectx, Expression t)
9349 StackAlloc target = (StackAlloc) t;
9350 target.count = count.Clone (clonectx);
9351 target.t = t.Clone (clonectx);
9356 // An object initializer expression
9358 public class ElementInitializer : Assign
9360 public readonly string Name;
9362 public ElementInitializer (string name, Expression initializer, Location loc)
9363 : base (null, initializer, loc)
9368 protected override void CloneTo (CloneContext clonectx, Expression t)
9370 ElementInitializer target = (ElementInitializer) t;
9371 target.source = source.Clone (clonectx);
9374 public override Expression CreateExpressionTree (ResolveContext ec)
9376 Arguments args = new Arguments (2);
9377 FieldExpr fe = target as FieldExpr;
9379 args.Add (new Argument (fe.CreateTypeOfExpression ()));
9381 args.Add (new Argument (((PropertyExpr)target).CreateSetterTypeOfExpression ()));
9383 args.Add (new Argument (source.CreateExpressionTree (ec)));
9384 return CreateExpressionFactoryCall (ec,
9385 source is CollectionOrObjectInitializers ? "ListBind" : "Bind",
9389 protected override Expression DoResolve (ResolveContext ec)
9392 return EmptyExpressionStatement.Instance;
9394 MemberExpr me = MemberLookupFinal (ec, ec.CurrentInitializerVariable.Type, ec.CurrentInitializerVariable.Type,
9395 Name, MemberTypes.Field | MemberTypes.Property, BindingFlags.Public | BindingFlags.Instance, loc) as MemberExpr;
9401 me.InstanceExpression = ec.CurrentInitializerVariable;
9403 if (source is CollectionOrObjectInitializers) {
9404 Expression previous = ec.CurrentInitializerVariable;
9405 ec.CurrentInitializerVariable = target;
9406 source = source.Resolve (ec);
9407 ec.CurrentInitializerVariable = previous;
9411 eclass = source.eclass;
9416 Expression expr = base.DoResolve (ec);
9421 // Ignore field initializers with default value
9423 Constant c = source as Constant;
9424 if (c != null && c.IsDefaultInitializer (type) && target.eclass == ExprClass.Variable)
9425 return EmptyExpressionStatement.Instance.Resolve (ec);
9430 protected override Expression Error_MemberLookupFailed (ResolveContext ec, Type type, MemberInfo[] members)
9432 MemberInfo member = members [0];
9433 if (member.MemberType != MemberTypes.Property && member.MemberType != MemberTypes.Field)
9434 ec.Report.Error (1913, loc, "Member `{0}' cannot be initialized. An object " +
9435 "initializer may only be used for fields, or properties", TypeManager.GetFullNameSignature (member));
9437 ec.Report.Error (1914, loc, " Static field or property `{0}' cannot be assigned in an object initializer",
9438 TypeManager.GetFullNameSignature (member));
9443 public override void EmitStatement (EmitContext ec)
9445 if (source is CollectionOrObjectInitializers)
9448 base.EmitStatement (ec);
9453 // A collection initializer expression
9455 class CollectionElementInitializer : Invocation
9457 public class ElementInitializerArgument : Argument
9459 public ElementInitializerArgument (Expression e)
9465 sealed class AddMemberAccess : MemberAccess
9467 public AddMemberAccess (Expression expr, Location loc)
9468 : base (expr, "Add", loc)
9472 protected override void Error_TypeDoesNotContainDefinition (ResolveContext ec, Type type, string name)
9474 if (TypeManager.HasElementType (type))
9477 base.Error_TypeDoesNotContainDefinition (ec, type, name);
9481 public CollectionElementInitializer (Expression argument)
9482 : base (null, new Arguments (1))
9484 base.arguments.Add (new ElementInitializerArgument (argument));
9485 this.loc = argument.Location;
9488 public CollectionElementInitializer (List<Expression> arguments, Location loc)
9489 : base (null, new Arguments (arguments.Count))
9491 foreach (Expression e in arguments)
9492 base.arguments.Add (new ElementInitializerArgument (e));
9497 public override Expression CreateExpressionTree (ResolveContext ec)
9499 Arguments args = new Arguments (2);
9500 args.Add (new Argument (mg.CreateExpressionTree (ec)));
9502 var expr_initializers = new ArrayInitializer (arguments.Count, loc);
9503 foreach (Argument a in arguments)
9504 expr_initializers.Add (a.CreateExpressionTree (ec));
9506 args.Add (new Argument (new ArrayCreation (
9507 CreateExpressionTypeExpression (ec, loc), "[]", expr_initializers, loc)));
9508 return CreateExpressionFactoryCall (ec, "ElementInit", args);
9511 protected override void CloneTo (CloneContext clonectx, Expression t)
9513 CollectionElementInitializer target = (CollectionElementInitializer) t;
9514 if (arguments != null)
9515 target.arguments = arguments.Clone (clonectx);
9518 protected override Expression DoResolve (ResolveContext ec)
9520 base.expr = new AddMemberAccess (ec.CurrentInitializerVariable, loc);
9522 return base.DoResolve (ec);
9527 // A block of object or collection initializers
9529 public class CollectionOrObjectInitializers : ExpressionStatement
9531 IList<Expression> initializers;
9532 bool is_collection_initialization;
9534 public static readonly CollectionOrObjectInitializers Empty =
9535 new CollectionOrObjectInitializers (Array.AsReadOnly (new Expression [0]), Location.Null);
9537 public CollectionOrObjectInitializers (IList<Expression> initializers, Location loc)
9539 this.initializers = initializers;
9543 public bool IsEmpty {
9545 return initializers.Count == 0;
9549 public bool IsCollectionInitializer {
9551 return is_collection_initialization;
9555 protected override void CloneTo (CloneContext clonectx, Expression target)
9557 CollectionOrObjectInitializers t = (CollectionOrObjectInitializers) target;
9559 t.initializers = new List<Expression> (initializers.Count);
9560 foreach (var e in initializers)
9561 t.initializers.Add (e.Clone (clonectx));
9564 public override Expression CreateExpressionTree (ResolveContext ec)
9566 var expr_initializers = new ArrayInitializer (initializers.Count, loc);
9567 foreach (Expression e in initializers) {
9568 Expression expr = e.CreateExpressionTree (ec);
9570 expr_initializers.Add (expr);
9573 return new ImplicitlyTypedArrayCreation ("[]", expr_initializers, loc);
9576 protected override Expression DoResolve (ResolveContext ec)
9578 List<string> element_names = null;
9579 for (int i = 0; i < initializers.Count; ++i) {
9580 Expression initializer = (Expression) initializers [i];
9581 ElementInitializer element_initializer = initializer as ElementInitializer;
9584 if (element_initializer != null) {
9585 element_names = new List<string> (initializers.Count);
9586 element_names.Add (element_initializer.Name);
9587 } else if (initializer is CompletingExpression){
9588 initializer.Resolve (ec);
9589 throw new InternalErrorException ("This line should never be reached");
9591 if (!TypeManager.ImplementsInterface (ec.CurrentInitializerVariable.Type, TypeManager.ienumerable_type)) {
9592 ec.Report.Error (1922, loc, "A field or property `{0}' cannot be initialized with a collection " +
9593 "object initializer because type `{1}' does not implement `{2}' interface",
9594 ec.CurrentInitializerVariable.GetSignatureForError (),
9595 TypeManager.CSharpName (ec.CurrentInitializerVariable.Type),
9596 TypeManager.CSharpName (TypeManager.ienumerable_type));
9599 is_collection_initialization = true;
9602 if (is_collection_initialization != (element_initializer == null)) {
9603 ec.Report.Error (747, initializer.Location, "Inconsistent `{0}' member declaration",
9604 is_collection_initialization ? "collection initializer" : "object initializer");
9608 if (!is_collection_initialization) {
9609 if (element_names.Contains (element_initializer.Name)) {
9610 ec.Report.Error (1912, element_initializer.Location,
9611 "An object initializer includes more than one member `{0}' initialization",
9612 element_initializer.Name);
9614 element_names.Add (element_initializer.Name);
9619 Expression e = initializer.Resolve (ec);
9620 if (e == EmptyExpressionStatement.Instance)
9621 initializers.RemoveAt (i--);
9623 initializers [i] = e;
9626 type = ec.CurrentInitializerVariable.Type;
9627 if (is_collection_initialization) {
9628 if (TypeManager.HasElementType (type)) {
9629 ec.Report.Error (1925, loc, "Cannot initialize object of type `{0}' with a collection initializer",
9630 TypeManager.CSharpName (type));
9634 eclass = ExprClass.Variable;
9638 public override void Emit (EmitContext ec)
9643 public override void EmitStatement (EmitContext ec)
9645 foreach (ExpressionStatement e in initializers)
9646 e.EmitStatement (ec);
9649 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
9651 foreach (Expression e in initializers)
9652 e.MutateHoistedGenericType (storey);
9657 // New expression with element/object initializers
9659 public class NewInitialize : New
9662 // This class serves as a proxy for variable initializer target instances.
9663 // A real variable is assigned later when we resolve left side of an
9666 sealed class InitializerTargetExpression : Expression, IMemoryLocation
9668 NewInitialize new_instance;
9670 public InitializerTargetExpression (NewInitialize newInstance)
9672 this.type = newInstance.type;
9673 this.loc = newInstance.loc;
9674 this.eclass = newInstance.eclass;
9675 this.new_instance = newInstance;
9678 public override Expression CreateExpressionTree (ResolveContext ec)
9680 // Should not be reached
9681 throw new NotSupportedException ("ET");
9684 protected override Expression DoResolve (ResolveContext ec)
9689 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
9694 public override void Emit (EmitContext ec)
9696 Expression e = (Expression) new_instance.instance;
9700 #region IMemoryLocation Members
9702 public void AddressOf (EmitContext ec, AddressOp mode)
9704 new_instance.instance.AddressOf (ec, mode);
9710 CollectionOrObjectInitializers initializers;
9711 IMemoryLocation instance;
9713 public NewInitialize (Expression requested_type, Arguments arguments, CollectionOrObjectInitializers initializers, Location l)
9714 : base (requested_type, arguments, l)
9716 this.initializers = initializers;
9719 protected override IMemoryLocation EmitAddressOf (EmitContext ec, AddressOp Mode)
9721 instance = base.EmitAddressOf (ec, Mode);
9723 if (!initializers.IsEmpty)
9724 initializers.Emit (ec);
9729 protected override void CloneTo (CloneContext clonectx, Expression t)
9731 base.CloneTo (clonectx, t);
9733 NewInitialize target = (NewInitialize) t;
9734 target.initializers = (CollectionOrObjectInitializers) initializers.Clone (clonectx);
9737 public override Expression CreateExpressionTree (ResolveContext ec)
9739 Arguments args = new Arguments (2);
9740 args.Add (new Argument (base.CreateExpressionTree (ec)));
9741 if (!initializers.IsEmpty)
9742 args.Add (new Argument (initializers.CreateExpressionTree (ec)));
9744 return CreateExpressionFactoryCall (ec,
9745 initializers.IsCollectionInitializer ? "ListInit" : "MemberInit",
9749 protected override Expression DoResolve (ResolveContext ec)
9751 Expression e = base.DoResolve (ec);
9755 Expression previous = ec.CurrentInitializerVariable;
9756 ec.CurrentInitializerVariable = new InitializerTargetExpression (this);
9757 initializers.Resolve (ec);
9758 ec.CurrentInitializerVariable = previous;
9762 public override bool Emit (EmitContext ec, IMemoryLocation target)
9764 bool left_on_stack = base.Emit (ec, target);
9766 if (initializers.IsEmpty)
9767 return left_on_stack;
9769 LocalTemporary temp = target as LocalTemporary;
9771 if (!left_on_stack) {
9772 VariableReference vr = target as VariableReference;
9774 // FIXME: This still does not work correctly for pre-set variables
9775 if (vr != null && vr.IsRef)
9776 target.AddressOf (ec, AddressOp.Load);
9778 ((Expression) target).Emit (ec);
9779 left_on_stack = true;
9782 temp = new LocalTemporary (type);
9789 initializers.Emit (ec);
9791 if (left_on_stack) {
9796 return left_on_stack;
9799 public override bool HasInitializer {
9801 return !initializers.IsEmpty;
9805 public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
9807 base.MutateHoistedGenericType (storey);
9808 initializers.MutateHoistedGenericType (storey);
9812 public class NewAnonymousType : New
9814 static readonly IList<AnonymousTypeParameter> EmptyParameters = Array.AsReadOnly (new AnonymousTypeParameter[0]);
9816 List<AnonymousTypeParameter> parameters;
9817 readonly TypeContainer parent;
9818 AnonymousTypeClass anonymous_type;
9820 public NewAnonymousType (List<AnonymousTypeParameter> parameters, TypeContainer parent, Location loc)
9821 : base (null, null, loc)
9823 this.parameters = parameters;
9824 this.parent = parent;
9827 protected override void CloneTo (CloneContext clonectx, Expression target)
9829 if (parameters == null)
9832 NewAnonymousType t = (NewAnonymousType) target;
9833 t.parameters = new List<AnonymousTypeParameter> (parameters.Count);
9834 foreach (AnonymousTypeParameter atp in parameters)
9835 t.parameters.Add ((AnonymousTypeParameter) atp.Clone (clonectx));
9838 AnonymousTypeClass CreateAnonymousType (ResolveContext ec, IList<AnonymousTypeParameter> parameters)
9840 AnonymousTypeClass type = parent.Module.Compiled.GetAnonymousType (parameters);
9844 type = AnonymousTypeClass.Create (ec.Compiler, parent, parameters, loc);
9851 if (ec.Report.Errors == 0)
9854 parent.Module.Compiled.AddAnonymousType (type);
9858 public override Expression CreateExpressionTree (ResolveContext ec)
9860 if (parameters == null)
9861 return base.CreateExpressionTree (ec);
9863 var init = new ArrayInitializer (parameters.Count, loc);
9864 foreach (Property p in anonymous_type.Properties)
9865 init.Add (new TypeOfMethod (TypeBuilder.GetMethod (type, p.GetBuilder), loc));
9867 var ctor_args = new ArrayInitializer (Arguments.Count, loc);
9868 foreach (Argument a in Arguments)
9869 ctor_args.Add (a.CreateExpressionTree (ec));
9871 Arguments args = new Arguments (3);
9872 args.Add (new Argument (method.CreateExpressionTree (ec)));
9873 args.Add (new Argument (new ArrayCreation (TypeManager.expression_type_expr, "[]", ctor_args, loc)));
9874 args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", init, loc)));
9876 return CreateExpressionFactoryCall (ec, "New", args);
9879 protected override Expression DoResolve (ResolveContext ec)
9881 if (ec.HasSet (ResolveContext.Options.ConstantScope)) {
9882 ec.Report.Error (836, loc, "Anonymous types cannot be used in this expression");
9886 if (parameters == null) {
9887 anonymous_type = CreateAnonymousType (ec, EmptyParameters);
9888 RequestedType = new TypeExpression (anonymous_type.TypeBuilder, loc);
9889 return base.DoResolve (ec);
9893 Arguments = new Arguments (parameters.Count);
9894 TypeExpression [] t_args = new TypeExpression [parameters.Count];
9895 for (int i = 0; i < parameters.Count; ++i) {
9896 Expression e = ((AnonymousTypeParameter) parameters [i]).Resolve (ec);
9902 Arguments.Add (new Argument (e));
9903 t_args [i] = new TypeExpression (e.Type, e.Location);
9909 anonymous_type = CreateAnonymousType (ec, parameters);
9910 if (anonymous_type == null)
9913 RequestedType = new GenericTypeExpr (anonymous_type.TypeBuilder, new TypeArguments (t_args), loc);
9914 return base.DoResolve (ec);
9918 public class AnonymousTypeParameter : ShimExpression
9920 public readonly string Name;
9922 public AnonymousTypeParameter (Expression initializer, string name, Location loc)
9923 : base (initializer)
9929 public AnonymousTypeParameter (Parameter parameter)
9930 : base (new SimpleName (parameter.Name, parameter.Location))
9932 this.Name = parameter.Name;
9933 this.loc = parameter.Location;
9936 public override bool Equals (object o)
9938 AnonymousTypeParameter other = o as AnonymousTypeParameter;
9939 return other != null && Name == other.Name;
9942 public override int GetHashCode ()
9944 return Name.GetHashCode ();
9947 protected override Expression DoResolve (ResolveContext ec)
9949 Expression e = expr.Resolve (ec);
9953 if (e.eclass == ExprClass.MethodGroup) {
9954 Error_InvalidInitializer (ec, e.ExprClassName);
9959 if (type == TypeManager.void_type || type == TypeManager.null_type ||
9960 type == InternalType.AnonymousMethod || type.IsPointer) {
9961 Error_InvalidInitializer (ec, e.GetSignatureForError ());
9968 protected virtual void Error_InvalidInitializer (ResolveContext ec, string initializer)
9970 ec.Report.Error (828, loc, "An anonymous type property `{0}' cannot be initialized with `{1}'",