2 // dynamic.cs: support for dynamic expressions
4 // Authors: Marek Safar (marek.safar@gmail.com)
6 // Dual licensed under the terms of the MIT X11 or GNU GPL
8 // Copyright 2009 Novell, Inc
12 using System.Collections;
13 using System.Reflection.Emit;
17 using SLE = System.Linq.Expressions;
22 class DynamicTypeExpr : TypeExpr
24 public DynamicTypeExpr (Location loc)
28 type = InternalType.Dynamic;
29 eclass = ExprClass.Type;
32 public override bool CheckAccessLevel (IMemberContext ds)
37 protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
44 // Expression created from runtime dynamic object value
46 public class RuntimeValueExpression : Expression, IDynamicAssign
49 public class DynamicMetaObject { public Type RuntimeType; }
52 readonly DynamicMetaObject obj;
54 public RuntimeValueExpression (DynamicMetaObject obj)
57 this.type = obj.RuntimeType;
58 this.eclass = ExprClass.Variable;
61 public override Expression CreateExpressionTree (ResolveContext ec)
63 throw new NotImplementedException ();
66 public override Expression DoResolve (ResolveContext ec)
71 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
76 public override void Emit (EmitContext ec)
78 throw new NotImplementedException ();
81 #region IAssignMethod Members
83 public void Emit (EmitContext ec, bool leave_copy)
85 throw new NotImplementedException ();
88 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
90 throw new NotImplementedException ();
96 public SLE.Expression MakeAssignExpression (BuilderContext ctx)
98 return obj.Expression;
101 public override SLE.Expression MakeExpression (BuilderContext ctx)
103 return SLE.Expression.Convert (obj.Expression, type);
107 public DynamicMetaObject MetaObject {
112 interface IDynamicBinder
114 Expression CreateCallSiteBinder (ResolveContext ec, Arguments args);
118 // Extends standard assignment interface for expressions
119 // supported by dynamic resolver
121 interface IDynamicAssign : IAssignMethod
124 SLE.Expression MakeAssignExpression (BuilderContext ctx);
128 class DynamicExpressionStatement : ExpressionStatement
130 class StaticDataClass : CompilerGeneratedClass
132 public StaticDataClass ()
133 : base (new RootDeclSpace (new NamespaceEntry (null, null, null)),
134 new MemberName (CompilerGeneratedClass.MakeName (null, "c", "DynamicSites", 0)),
135 Modifiers.INTERNAL | Modifiers.STATIC)
137 ModFlags &= ~Modifiers.SEALED;
141 static StaticDataClass global_site_container;
142 static int field_counter;
143 static int container_counter;
145 readonly Arguments arguments;
146 protected IDynamicBinder binder;
147 Expression binder_expr;
149 public DynamicExpressionStatement (IDynamicBinder binder, Arguments args, Location loc)
151 this.binder = binder;
152 this.arguments = args;
156 public Arguments Arguments {
162 static TypeContainer CreateSiteContainer ()
164 if (global_site_container == null) {
165 global_site_container = new StaticDataClass ();
166 RootContext.ToplevelTypes.AddCompilerGeneratedClass (global_site_container);
167 global_site_container.DefineType ();
168 global_site_container.Define ();
169 // global_site_container.EmitType ();
171 RootContext.RegisterCompilerGeneratedType (global_site_container.TypeBuilder);
174 return global_site_container;
177 static Field CreateSiteField (FullNamedExpression type)
179 TypeContainer site_container = CreateSiteContainer ();
180 Field f = new Field (site_container, type, Modifiers.PUBLIC | Modifiers.STATIC,
181 new MemberName ("Site" + field_counter++), null);
184 site_container.AddField (f);
188 public override Expression CreateExpressionTree (ResolveContext ec)
190 throw new NotImplementedException ();
193 public override Expression DoResolve (ResolveContext ec)
195 if (eclass != ExprClass.Invalid)
198 if (TypeManager.call_site_type == null)
199 TypeManager.call_site_type = TypeManager.CoreLookupType (ec.Compiler,
200 "System.Runtime.CompilerServices", "CallSite", Kind.Class, true);
202 if (TypeManager.generic_call_site_type == null)
203 TypeManager.generic_call_site_type = TypeManager.CoreLookupType (ec.Compiler,
204 "System.Runtime.CompilerServices", "CallSite`1", Kind.Class, true);
206 eclass = ExprClass.Value;
209 type = InternalType.Dynamic;
211 binder_expr = binder.CreateCallSiteBinder (ec, arguments);
215 public override void Emit (EmitContext ec)
220 public override void EmitStatement (EmitContext ec)
222 // All C# created payloads require to have object convertible
223 // return type even if we know it won't be used
225 ec.ig.Emit (OpCodes.Pop);
228 void EmitCall (EmitContext ec)
230 int dyn_args_count = arguments == null ? 0 : arguments.Count;
231 TypeExpr site_type = CreateSiteType (RootContext.ToplevelTypes.Compiler, dyn_args_count);
232 FieldExpr site_field_expr = new FieldExpr (CreateSiteField (site_type).FieldBuilder, loc);
234 SymbolWriter.OpenCompilerGeneratedBlock (ec.ig);
236 Arguments args = new Arguments (1);
237 args.Add (new Argument (binder_expr));
238 StatementExpression s = new StatementExpression (new SimpleAssign (site_field_expr, new Invocation (new MemberAccess (site_type, "Create"), args)));
240 BlockContext bc = new BlockContext (ec.MemberContext, null, TypeManager.void_type);
241 if (s.Resolve (bc)) {
242 Statement init = new If (new Binary (Binary.Operator.Equality, site_field_expr, new NullLiteral (loc)), s, loc);
246 args = new Arguments (1 + dyn_args_count);
247 args.Add (new Argument (site_field_expr));
248 if (arguments != null) {
249 foreach (Argument a in arguments) {
250 if (a is NamedArgument) {
251 // Name is not valid in this context
252 args.Add (new Argument (a.Expr, a.ArgType));
260 ResolveContext rc = new ResolveContext (ec.MemberContext);
261 Expression target = new DelegateInvocation (new MemberAccess (site_field_expr, "Target", loc).Resolve (rc), args, loc).Resolve (rc);
265 SymbolWriter.CloseCompilerGeneratedBlock (ec.ig);
268 public static MemberAccess GetBinderNamespace (Location loc)
270 return new MemberAccess (new MemberAccess (
271 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "Microsoft", loc), "CSharp", loc), "RuntimeBinder", loc);
274 TypeExpr CreateSiteType (CompilerContext ctx, int dyn_args_count)
276 const int default_args = 2;
278 bool has_ref_out_argument = false;
279 FullNamedExpression[] targs = new FullNamedExpression[dyn_args_count + default_args];
280 targs [0] = new TypeExpression (TypeManager.call_site_type, loc);
281 for (int i = 0; i < dyn_args_count; ++i) {
283 Argument a = arguments [i];
284 if (a.Type == TypeManager.null_type)
285 arg_type = TypeManager.object_type;
287 arg_type = TypeManager.TypeToReflectionType (a.Type);
289 if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
290 has_ref_out_argument = true;
292 targs [i + 1] = new TypeExpression (arg_type, loc);
295 TypeExpr del_type = null;
296 if (!has_ref_out_argument) {
297 Type t = TypeManager.CoreLookupType (ctx, "System", "Func`" + (dyn_args_count + default_args), Kind.Delegate, false);
299 targs[targs.Length - 1] = new TypeExpression (TypeManager.TypeToReflectionType (type), loc);
300 del_type = new GenericTypeExpr (t, new TypeArguments (targs), loc);
304 // No appropriate predefined delegate found
305 if (del_type == null) {
306 Parameter[] p = new Parameter [dyn_args_count + 1];
307 p[0] = new Parameter (targs [0], "p0", Parameter.Modifier.NONE, null, loc);
309 for (int i = 1; i < dyn_args_count + 1; ++i)
310 p[i] = new Parameter (targs[i], "p" + i.ToString ("X"), arguments[i - 1].Modifier, null, loc);
312 TypeContainer parent = CreateSiteContainer ();
313 Delegate d = new Delegate (parent.NamespaceEntry, parent, new TypeExpression (TypeManager.TypeToReflectionType (type), loc),
314 Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
315 new MemberName ("Container" + container_counter++.ToString ("X")),
316 new ParametersCompiled (p), null);
321 parent.AddDelegate (d);
322 del_type = new TypeExpression (d.TypeBuilder, loc);
325 TypeExpr site_type = new GenericTypeExpr (TypeManager.generic_call_site_type, new TypeArguments (del_type), loc);
329 public static void Reset ()
331 global_site_container = null;
332 field_counter = container_counter = 0;
337 // Dynamic member access compound assignment for events
339 class DynamicEventCompoundAssign : DynamicExpressionStatement, IDynamicBinder
342 ExpressionStatement assignment;
343 ExpressionStatement invoke;
345 public DynamicEventCompoundAssign (string name, Arguments args, ExpressionStatement assignment, ExpressionStatement invoke, Location loc)
346 : base (null, args, loc)
349 this.assignment = assignment;
350 this.invoke = invoke;
353 // Used by += or -= only
354 type = TypeManager.bool_type;
357 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
359 Arguments binder_args = new Arguments (2);
360 MemberAccess binder = GetBinderNamespace (loc);
362 binder_args.Add (new Argument (new StringLiteral (name, loc)));
363 binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
365 return new New (new MemberAccess (binder, "CSharpIsEventBinder", loc), binder_args, loc);
368 public override void EmitStatement (EmitContext ec)
370 Statement cond = new If (
371 new Binary (Binary.Operator.Equality, this, new BoolLiteral (true, loc)),
372 new StatementExpression (invoke),
373 new StatementExpression (assignment),
379 class DynamicConversion : DynamicExpressionStatement, IDynamicBinder
383 public DynamicConversion (Type targetType, bool isExplicit, Arguments args, Location loc)
384 : base (null, args, loc)
387 is_explicit = isExplicit;
391 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
393 Arguments binder_args = new Arguments (2);
394 MemberAccess binder = GetBinderNamespace (loc);
396 binder_args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
397 binder_args.Add (new Argument (new MemberAccess (new MemberAccess (binder, "CSharpConversionKind", loc),
398 is_explicit ? "ExplicitConversion" : "ImplicitConversion", loc)));
399 binder_args.Add (new Argument (new BoolLiteral (ec.HasSet (ResolveContext.Options.CheckedScope), loc)));
401 return new New (new MemberAccess (binder, "CSharpConvertBinder", loc), binder_args, loc);
405 class DynamicIndexBinder : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
409 public DynamicIndexBinder (bool isSet, Arguments args, Location loc)
410 : base (null, args, loc)
416 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
418 Arguments binder_args = new Arguments (2);
419 MemberAccess binder = GetBinderNamespace (loc);
421 binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
422 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
424 return new New (new MemberAccess (binder, isSet ? "CSharpSetIndexBinder" : "CSharpGetIndexBinder", loc), binder_args, loc);
427 #region IAssignMethod Members
429 public void Emit (EmitContext ec, bool leave_copy)
431 throw new NotImplementedException ();
434 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
445 class DynamicInvocation : DynamicExpressionStatement, IDynamicBinder
447 ATypeNameExpression member;
449 public DynamicInvocation (ATypeNameExpression member, Arguments args, Location loc)
450 : base (null, args, loc)
453 this.member = member;
456 public DynamicInvocation (ATypeNameExpression member, Arguments args, Type type, Location loc)
457 : this (member, args, loc)
459 // When a return type is known not to be dynamic
463 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
465 Arguments binder_args = new Arguments (member != null ? 5 : 3);
466 MemberAccess binder = GetBinderNamespace (loc);
467 bool is_member_access = member is MemberAccess;
470 if (!is_member_access && member is SimpleName) {
471 call_flags = "SimpleNameCall";
472 is_member_access = true;
477 binder_args.Add (new Argument (new MemberAccess (new MemberAccess (binder, "CSharpCallFlags", loc), call_flags, loc)));
479 if (is_member_access)
480 binder_args.Add (new Argument (new StringLiteral (member.Name, member.Location)));
482 binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
484 if (member != null && member.HasTypeArguments) {
485 TypeArguments ta = member.TypeArguments;
486 if (ta.Resolve (ec)) {
487 ArrayList targs = new ArrayList (ta.Count);
488 foreach (Type t in ta.Arguments)
489 targs.Add (new TypeOf (new TypeExpression (t, loc), loc));
491 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", targs, loc)));
493 } else if (is_member_access) {
494 binder_args.Add (new Argument (new NullLiteral (loc)));
497 Expression real_args;
499 // Cannot be null because .NET trips over
500 real_args = new ArrayCreation (new MemberAccess (binder, "CSharpArgumentInfo", loc), "[]", new ArrayList (0), loc);
502 real_args = new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc);
505 binder_args.Add (new Argument (real_args));
507 return new New (new MemberAccess (binder,
508 is_member_access ? "CSharpInvokeMemberBinder" : "CSharpInvokeBinder", loc), binder_args, loc);
512 class DynamicMemberBinder : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
515 readonly string name;
517 public DynamicMemberBinder (bool isSet, string name, Arguments args, Location loc)
518 : base (null, args, loc)
525 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
527 Arguments binder_args = new Arguments (3);
528 MemberAccess binder = GetBinderNamespace (loc);
530 binder_args.Add (new Argument (new StringLiteral (name, loc)));
531 binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
532 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
534 return new New (new MemberAccess (binder, isSet ? "CSharpSetMemberBinder" : "CSharpGetMemberBinder", loc), binder_args, loc);
537 #region IAssignMethod Members
539 public void Emit (EmitContext ec, bool leave_copy)
541 throw new NotImplementedException ();
544 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
555 class DynamicUnaryConversion : DynamicExpressionStatement, IDynamicBinder
559 public DynamicUnaryConversion (string name, Arguments args, Location loc)
560 : base (null, args, loc)
564 if (name == "IsTrue" || name == "IsFalse")
565 type = TypeManager.bool_type;
568 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
570 Arguments binder_args = new Arguments (3);
572 MemberAccess sle = new MemberAccess (new MemberAccess (
573 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
575 MemberAccess binder = GetBinderNamespace (loc);
577 binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), name, loc)));
578 binder_args.Add (new Argument (new BoolLiteral (ec.HasSet (ResolveContext.Options.CheckedScope), loc)));
579 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
581 return new New (new MemberAccess (binder, "CSharpUnaryOperationBinder", loc), binder_args, loc);