2 // anonymous.cs: Support for anonymous methods and types
5 // Miguel de Icaza (miguel@ximain.com)
6 // Marek Safar (marek.safar@gmail.com)
8 // Dual licensed under the terms of the MIT X11 or GNU GPL
9 // Copyright 2003-2011 Novell, Inc.
10 // Copyright 2011 Xamarin Inc
14 using System.Collections.Generic;
15 using Mono.CompilerServices.SymbolWriter;
16 using System.Diagnostics;
19 using IKVM.Reflection;
20 using IKVM.Reflection.Emit;
22 using System.Reflection;
23 using System.Reflection.Emit;
26 namespace Mono.CSharp {
28 public abstract class CompilerGeneratedContainer : ClassOrStruct
30 protected CompilerGeneratedContainer (TypeContainer parent, MemberName name, Modifiers mod)
31 : this (parent, name, mod, MemberKind.Class)
35 protected CompilerGeneratedContainer (TypeContainer parent, MemberName name, Modifiers mod, MemberKind kind)
36 : base (parent, name, null, kind)
38 Debug.Assert ((mod & Modifiers.AccessibilityMask) != 0);
40 ModFlags = mod | Modifiers.COMPILER_GENERATED | Modifiers.SEALED;
41 spec = new TypeSpec (Kind, null, this, null, ModFlags);
44 protected void CheckMembersDefined ()
46 if (HasMembersDefined)
47 throw new InternalErrorException ("Helper class already defined!");
50 protected override bool DoDefineMembers ()
52 if (Kind == MemberKind.Class && !IsStatic && !PartialContainer.HasInstanceConstructor) {
53 DefineDefaultConstructor (false);
56 return base.DoDefineMembers ();
59 protected static MemberName MakeMemberName (MemberBase host, string name, int unique_id, TypeParameters tparams, Location loc)
61 string host_name = host == null ? null : host is InterfaceMemberBase ? ((InterfaceMemberBase)host).GetFullName (host.MemberName) : host.MemberName.Name;
62 string tname = MakeName (host_name, "c", name, unique_id);
63 TypeParameters args = null;
64 if (tparams != null) {
65 args = new TypeParameters (tparams.Count);
67 // Type parameters will be filled later when we have TypeContainer
68 // instance, for now we need only correct arity to create valid name
69 for (int i = 0; i < tparams.Count; ++i)
70 args.Add ((TypeParameter) null);
73 return new MemberName (tname, args, loc);
76 public static string MakeName (string host, string typePrefix, string name, int id)
78 return "<" + host + ">" + typePrefix + "__" + name + id.ToString ("X");
81 protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
83 base_type = Compiler.BuiltinTypes.Object;
90 public class HoistedStoreyClass : CompilerGeneratedContainer
92 public sealed class HoistedField : Field
94 public HoistedField (HoistedStoreyClass parent, FullNamedExpression type, Modifiers mod, string name,
95 Attributes attrs, Location loc)
96 : base (parent, type, mod, new MemberName (name, loc), attrs)
100 protected override bool ResolveMemberType ()
102 if (!base.ResolveMemberType ())
105 HoistedStoreyClass parent = ((HoistedStoreyClass) Parent).GetGenericStorey ();
106 if (parent != null && parent.Mutator != null)
107 member_type = parent.Mutator.Mutate (MemberType);
113 protected TypeParameterMutator mutator;
115 public HoistedStoreyClass (TypeDefinition parent, MemberName name, TypeParameters tparams, Modifiers mods, MemberKind kind)
116 : base (parent, name, mods | Modifiers.PRIVATE, kind)
119 if (tparams != null) {
120 var type_params = name.TypeParameters;
121 var src = new TypeParameterSpec[tparams.Count];
122 var dst = new TypeParameterSpec[tparams.Count];
124 for (int i = 0; i < tparams.Count; ++i) {
125 type_params[i] = tparams[i].CreateHoistedCopy (spec);
127 src[i] = tparams[i].Type;
128 dst[i] = type_params[i].Type;
131 // A copy is not enough, inflate any type parameter constraints
132 // using a new type parameters
133 var inflator = new TypeParameterInflator (this, null, src, dst);
134 for (int i = 0; i < tparams.Count; ++i) {
135 src[i].InflateConstraints (inflator, dst[i]);
138 mutator = new TypeParameterMutator (tparams, type_params);
144 public TypeParameterMutator Mutator {
155 public HoistedStoreyClass GetGenericStorey ()
157 TypeContainer storey = this;
158 while (storey != null && storey.CurrentTypeParameters == null)
159 storey = storey.Parent;
161 return storey as HoistedStoreyClass;
167 // Anonymous method storey is created when an anonymous method uses
168 // variable or parameter from outer scope. They are then hoisted to
169 // anonymous method storey (captured)
171 public class AnonymousMethodStorey : HoistedStoreyClass
173 struct StoreyFieldPair
175 public readonly AnonymousMethodStorey Storey;
176 public readonly Field Field;
178 public StoreyFieldPair (AnonymousMethodStorey storey, Field field)
180 this.Storey = storey;
186 // Needed to delay hoisted _this_ initialization. When an anonymous
187 // method is used inside ctor and _this_ is hoisted, base ctor has to
188 // be called first, otherwise _this_ will be initialized with
189 // uninitialized value.
191 sealed class ThisInitializer : Statement
193 readonly HoistedThis hoisted_this;
194 readonly AnonymousMethodStorey parent;
196 public ThisInitializer (HoistedThis hoisted_this, AnonymousMethodStorey parent)
198 this.hoisted_this = hoisted_this;
199 this.parent = parent;
202 protected override void DoEmit (EmitContext ec)
207 source = new CompilerGeneratedThis (ec.CurrentType, loc);
209 source = new FieldExpr (parent.HoistedThis.Field, Location.Null) {
210 InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location.Null)
214 hoisted_this.EmitAssign (ec, source, false, false);
217 protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
222 protected override void CloneTo (CloneContext clonectx, Statement target)
229 public readonly int ID;
231 public readonly ExplicitBlock OriginalSourceBlock;
233 // A list of StoreyFieldPair with local field keeping parent storey instance
234 List<StoreyFieldPair> used_parent_storeys;
235 List<ExplicitBlock> children_references;
237 // A list of hoisted parameters
238 protected List<HoistedParameter> hoisted_params;
239 List<HoistedParameter> hoisted_local_params;
240 protected List<HoistedVariable> hoisted_locals;
243 protected HoistedThis hoisted_this;
245 // Local variable which holds this storey instance
246 public Expression Instance;
248 bool initialize_hoisted_this;
249 AnonymousMethodStorey hoisted_this_parent;
251 public AnonymousMethodStorey (ExplicitBlock block, TypeDefinition parent, MemberBase host, TypeParameters tparams, string name, MemberKind kind)
252 : base (parent, MakeMemberName (host, name, parent.PartialContainer.CounterAnonymousContainers, tparams, block.StartLocation),
255 OriginalSourceBlock = block;
256 ID = parent.PartialContainer.CounterAnonymousContainers++;
259 public void AddCapturedThisField (EmitContext ec, AnonymousMethodStorey parent)
261 TypeExpr type_expr = new TypeExpression (ec.CurrentType, Location);
262 Field f = AddCompilerGeneratedField ("$this", type_expr);
263 hoisted_this = new HoistedThis (this, f);
265 initialize_hoisted_this = true;
266 hoisted_this_parent = parent;
269 public Field AddCapturedVariable (string name, TypeSpec type)
271 CheckMembersDefined ();
273 FullNamedExpression field_type = new TypeExpression (type, Location);
274 if (!spec.IsGenericOrParentIsGeneric)
275 return AddCompilerGeneratedField (name, field_type);
277 const Modifiers mod = Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED;
278 Field f = new HoistedField (this, field_type, mod, name, null, Location);
283 protected Field AddCompilerGeneratedField (string name, FullNamedExpression type)
285 return AddCompilerGeneratedField (name, type, false);
288 protected Field AddCompilerGeneratedField (string name, FullNamedExpression type, bool privateAccess)
290 Modifiers mod = Modifiers.COMPILER_GENERATED | (privateAccess ? Modifiers.PRIVATE : Modifiers.INTERNAL);
291 Field f = new Field (this, type, mod, new MemberName (name, Location), null);
297 // Creates a link between hoisted variable block and the anonymous method storey
299 // An anonymous method can reference variables from any outer block, but they are
300 // hoisted in their own ExplicitBlock. When more than one block is referenced we
301 // need to create another link between those variable storeys
303 public void AddReferenceFromChildrenBlock (ExplicitBlock block)
305 if (children_references == null)
306 children_references = new List<ExplicitBlock> ();
308 if (!children_references.Contains (block))
309 children_references.Add (block);
312 public void AddParentStoreyReference (EmitContext ec, AnonymousMethodStorey storey)
314 CheckMembersDefined ();
316 if (used_parent_storeys == null)
317 used_parent_storeys = new List<StoreyFieldPair> ();
318 else if (used_parent_storeys.Exists (i => i.Storey == storey))
321 TypeExpr type_expr = storey.CreateStoreyTypeExpression (ec);
322 Field f = AddCompilerGeneratedField ("<>f__ref$" + storey.ID, type_expr);
323 used_parent_storeys.Add (new StoreyFieldPair (storey, f));
326 public void CaptureLocalVariable (ResolveContext ec, LocalVariable localVariable)
328 if (this is StateMachine) {
329 if (ec.CurrentBlock.ParametersBlock != localVariable.Block.ParametersBlock)
330 ec.CurrentBlock.Explicit.HasCapturedVariable = true;
332 ec.CurrentBlock.Explicit.HasCapturedVariable = true;
335 var hoisted = localVariable.HoistedVariant;
336 if (hoisted != null && hoisted.Storey != this && hoisted.Storey is StateMachine) {
338 // Variable is already hoisted but we need it in storey which can be shared
340 hoisted.Storey.hoisted_locals.Remove (hoisted);
341 hoisted.Storey.Members.Remove (hoisted.Field);
345 if (hoisted == null) {
346 hoisted = new HoistedLocalVariable (this, localVariable, GetVariableMangledName (localVariable));
347 localVariable.HoistedVariant = hoisted;
349 if (hoisted_locals == null)
350 hoisted_locals = new List<HoistedVariable> ();
352 hoisted_locals.Add (hoisted);
355 if (ec.CurrentBlock.Explicit != localVariable.Block.Explicit && !(hoisted.Storey is StateMachine) && hoisted.Storey != null)
356 hoisted.Storey.AddReferenceFromChildrenBlock (ec.CurrentBlock.Explicit);
359 public void CaptureParameter (ResolveContext ec, ParametersBlock.ParameterInfo parameterInfo, ParameterReference parameterReference)
361 if (!(this is StateMachine)) {
362 ec.CurrentBlock.Explicit.HasCapturedVariable = true;
365 var hoisted = parameterInfo.Parameter.HoistedVariant;
367 if (parameterInfo.Block.StateMachine != null) {
369 // Another storey in same block exists but state machine does not
370 // have parameter captured. We need to add it there as well to
371 // proxy parameter value correctly.
373 if (hoisted == null && parameterInfo.Block.StateMachine != this) {
374 var storey = parameterInfo.Block.StateMachine;
376 hoisted = new HoistedParameter (storey, parameterReference);
377 parameterInfo.Parameter.HoistedVariant = hoisted;
379 if (storey.hoisted_params == null)
380 storey.hoisted_params = new List<HoistedParameter> ();
382 storey.hoisted_params.Add (hoisted);
386 // Lift captured parameter from value type storey to reference type one. Otherwise
387 // any side effects would be done on a copy
389 if (hoisted != null && hoisted.Storey != this && hoisted.Storey is StateMachine) {
390 if (hoisted_local_params == null)
391 hoisted_local_params = new List<HoistedParameter> ();
393 hoisted_local_params.Add (hoisted);
398 if (hoisted == null) {
399 hoisted = new HoistedParameter (this, parameterReference);
400 parameterInfo.Parameter.HoistedVariant = hoisted;
402 if (hoisted_params == null)
403 hoisted_params = new List<HoistedParameter> ();
405 hoisted_params.Add (hoisted);
409 // Register link between current block and parameter storey. It will
410 // be used when setting up storey definition to deploy storey reference
411 // when parameters are used from multiple blocks
413 if (ec.CurrentBlock.Explicit != parameterInfo.Block) {
414 hoisted.Storey.AddReferenceFromChildrenBlock (ec.CurrentBlock.Explicit);
418 TypeExpr CreateStoreyTypeExpression (EmitContext ec)
421 // Create an instance of storey type
423 TypeExpr storey_type_expr;
424 if (CurrentTypeParameters != null) {
426 // Use current method type parameter (MVAR) for top level storey only. All
427 // nested storeys use class type parameter (VAR)
429 var tparams = ec.CurrentAnonymousMethod != null && ec.CurrentAnonymousMethod.Storey != null ?
430 ec.CurrentAnonymousMethod.Storey.CurrentTypeParameters :
431 ec.CurrentTypeParameters;
433 TypeArguments targs = new TypeArguments ();
436 // Use type parameter name instead of resolved type parameter
437 // specification to resolve to correctly nested type parameters
439 for (int i = 0; i < tparams.Count; ++i)
440 targs.Add (new SimpleName (tparams [i].Name, Location)); // new TypeParameterExpr (tparams[i], Location));
442 storey_type_expr = new GenericTypeExpr (Definition, targs, Location);
444 storey_type_expr = new TypeExpression (CurrentType, Location);
447 return storey_type_expr;
450 public void SetNestedStoryParent (AnonymousMethodStorey parentStorey)
452 Parent = parentStorey;
453 spec.IsGeneric = false;
454 spec.DeclaringType = parentStorey.CurrentType;
455 MemberName.TypeParameters = null;
458 protected override bool DoResolveTypeParameters ()
460 // Although any storey can have type parameters they are all clones of method type
461 // parameters therefore have to mutate MVAR references in any of cloned constraints
462 if (CurrentTypeParameters != null) {
463 for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
464 var spec = CurrentTypeParameters[i].Type;
465 spec.BaseType = mutator.Mutate (spec.BaseType);
466 if (spec.InterfacesDefined != null) {
467 var mutated = new TypeSpec[spec.InterfacesDefined.Length];
468 for (int ii = 0; ii < mutated.Length; ++ii) {
469 mutated[ii] = mutator.Mutate (spec.InterfacesDefined[ii]);
472 spec.InterfacesDefined = mutated;
475 if (spec.TypeArguments != null) {
476 spec.TypeArguments = mutator.Mutate (spec.TypeArguments);
482 // Update parent cache as we most likely passed the point
483 // where the cache was constructed
485 Parent.CurrentType.MemberCache.AddMember (this.spec);
491 // Initializes all hoisted variables
493 public void EmitStoreyInstantiation (EmitContext ec, ExplicitBlock block)
495 // There can be only one instance variable for each storey type
496 if (Instance != null)
497 throw new InternalErrorException ();
500 // Create an instance of this storey
502 ResolveContext rc = new ResolveContext (ec.MemberContext);
503 rc.CurrentBlock = block;
505 var storey_type_expr = CreateStoreyTypeExpression (ec);
506 var source = new New (storey_type_expr, null, Location).Resolve (rc);
509 // When the current context is async (or iterator) lift local storey
510 // instantiation to the currect storey
512 if (ec.CurrentAnonymousMethod is StateMachineInitializer && (block.HasYield || block.HasAwait)) {
514 // Unfortunately, normal capture mechanism could not be used because we are
515 // too late in the pipeline and standart assign cannot be used either due to
516 // recursive nature of GetStoreyInstanceExpression
518 var field = ec.CurrentAnonymousMethod.Storey.AddCompilerGeneratedField (
519 LocalVariable.GetCompilerGeneratedName (block), storey_type_expr, true);
524 var fexpr = new FieldExpr (field, Location);
525 fexpr.InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location);
526 fexpr.EmitAssign (ec, source, false, false);
529 var local = TemporaryVariableReference.Create (source.Type, block, Location);
530 if (source.Type.IsStruct) {
531 local.LocalInfo.CreateBuilder (ec);
533 local.EmitAssign (ec, source);
539 EmitHoistedFieldsInitialization (rc, ec);
541 // TODO: Implement properly
542 //SymbolWriter.DefineScopeVariable (ID, Instance.Builder);
545 void EmitHoistedFieldsInitialization (ResolveContext rc, EmitContext ec)
548 // Initialize all storey reference fields by using local or hoisted variables
550 if (used_parent_storeys != null) {
551 foreach (StoreyFieldPair sf in used_parent_storeys) {
553 // Get instance expression of storey field
555 Expression instace_expr = GetStoreyInstanceExpression (ec);
556 var fs = sf.Field.Spec;
557 if (TypeManager.IsGenericType (instace_expr.Type))
558 fs = MemberCache.GetMember (instace_expr.Type, fs);
560 FieldExpr f_set_expr = new FieldExpr (fs, Location);
561 f_set_expr.InstanceExpression = instace_expr;
563 // TODO: CompilerAssign expression
564 SimpleAssign a = new SimpleAssign (f_set_expr, sf.Storey.GetStoreyInstanceExpression (ec));
565 if (a.Resolve (rc) != null)
566 a.EmitStatement (ec);
571 // Initialize hoisted `this' only once, everywhere else will be
572 // referenced indirectly
574 if (initialize_hoisted_this) {
575 rc.CurrentBlock.AddScopeStatement (new ThisInitializer (hoisted_this, hoisted_this_parent));
579 // Setting currect anonymous method to null blocks any further variable hoisting
581 AnonymousExpression ae = ec.CurrentAnonymousMethod;
582 ec.CurrentAnonymousMethod = null;
584 if (hoisted_params != null) {
585 EmitHoistedParameters (ec, hoisted_params);
588 ec.CurrentAnonymousMethod = ae;
591 protected virtual void EmitHoistedParameters (EmitContext ec, List<HoistedParameter> hoisted)
593 foreach (HoistedParameter hp in hoisted) {
598 // Parameters could be proxied via local fields for value type storey
600 if (hoisted_local_params != null) {
601 var local_param = hoisted_local_params.Find (l => l.Parameter.Parameter == hp.Parameter.Parameter);
602 var source = new FieldExpr (local_param.Field, Location);
603 source.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
604 hp.EmitAssign (ec, source, false, false);
608 hp.EmitHoistingAssignment (ec);
613 // Returns a field which holds referenced storey instance
615 Field GetReferencedStoreyField (AnonymousMethodStorey storey)
617 if (used_parent_storeys == null)
620 foreach (StoreyFieldPair sf in used_parent_storeys) {
621 if (sf.Storey == storey)
629 // Creates storey instance expression regardless of currect IP
631 public Expression GetStoreyInstanceExpression (EmitContext ec)
633 AnonymousExpression am = ec.CurrentAnonymousMethod;
636 // Access from original block -> storey
642 // Access from anonymous method implemented as a static -> storey
644 if (am.Storey == null)
647 Field f = am.Storey.GetReferencedStoreyField (this);
649 if (am.Storey == this) {
651 // Access from inside of same storey (S -> S)
653 return new CompilerGeneratedThis (CurrentType, Location);
657 // External field access
663 // Storey was cached to local field
665 FieldExpr f_ind = new FieldExpr (f, Location);
666 f_ind.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
670 protected virtual string GetVariableMangledName (LocalVariable local_info)
673 // No need to mangle anonymous method hoisted variables cause they
674 // are hoisted in their own scopes
676 return local_info.Name;
679 public HoistedThis HoistedThis {
684 hoisted_this = value;
688 public IList<ExplicitBlock> ReferencesFromChildrenBlock {
689 get { return children_references; }
693 public abstract class HoistedVariable
696 // Hoisted version of variable references used in expression
697 // tree has to be delayed until we know its location. The variable
698 // doesn't know its location until all stories are calculated
700 class ExpressionTreeVariableReference : Expression
702 readonly HoistedVariable hv;
704 public ExpressionTreeVariableReference (HoistedVariable hv)
709 public override bool ContainsEmitWithAwait ()
714 public override Expression CreateExpressionTree (ResolveContext ec)
716 return hv.CreateExpressionTree ();
719 protected override Expression DoResolve (ResolveContext ec)
721 eclass = ExprClass.Value;
722 type = ec.Module.PredefinedTypes.Expression.Resolve ();
726 public override void Emit (EmitContext ec)
728 ResolveContext rc = new ResolveContext (ec.MemberContext);
729 Expression e = hv.GetFieldExpression (ec).CreateExpressionTree (rc, false);
730 // This should never fail
737 protected readonly AnonymousMethodStorey storey;
738 protected Field field;
739 Dictionary<AnonymousExpression, FieldExpr> cached_inner_access; // TODO: Hashtable is too heavyweight
740 FieldExpr cached_outer_access;
742 protected HoistedVariable (AnonymousMethodStorey storey, string name, TypeSpec type)
743 : this (storey, storey.AddCapturedVariable (name, type))
747 protected HoistedVariable (AnonymousMethodStorey storey, Field field)
749 this.storey = storey;
759 public AnonymousMethodStorey Storey {
765 public void AddressOf (EmitContext ec, AddressOp mode)
767 GetFieldExpression (ec).AddressOf (ec, mode);
770 public Expression CreateExpressionTree ()
772 return new ExpressionTreeVariableReference (this);
775 public void Emit (EmitContext ec)
777 GetFieldExpression (ec).Emit (ec);
780 public Expression EmitToField (EmitContext ec)
782 return GetFieldExpression (ec);
786 // Creates field access expression for hoisted variable
788 protected virtual FieldExpr GetFieldExpression (EmitContext ec)
790 if (ec.CurrentAnonymousMethod == null || ec.CurrentAnonymousMethod.Storey == null) {
791 if (cached_outer_access != null)
792 return cached_outer_access;
795 // When setting top-level hoisted variable in generic storey
796 // change storey generic types to method generic types (VAR -> MVAR)
798 if (storey.Instance.Type.IsGenericOrParentIsGeneric) {
799 var fs = MemberCache.GetMember (storey.Instance.Type, field.Spec);
800 cached_outer_access = new FieldExpr (fs, field.Location);
802 cached_outer_access = new FieldExpr (field, field.Location);
805 cached_outer_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
806 return cached_outer_access;
809 FieldExpr inner_access;
810 if (cached_inner_access != null) {
811 if (!cached_inner_access.TryGetValue (ec.CurrentAnonymousMethod, out inner_access))
815 cached_inner_access = new Dictionary<AnonymousExpression, FieldExpr> (4);
818 if (inner_access == null) {
819 if (field.Parent.IsGenericOrParentIsGeneric) {
820 var fs = MemberCache.GetMember (field.Parent.CurrentType, field.Spec);
821 inner_access = new FieldExpr (fs, field.Location);
823 inner_access = new FieldExpr (field, field.Location);
826 inner_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
827 cached_inner_access.Add (ec.CurrentAnonymousMethod, inner_access);
833 public void Emit (EmitContext ec, bool leave_copy)
835 GetFieldExpression (ec).Emit (ec, leave_copy);
838 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
840 GetFieldExpression (ec).EmitAssign (ec, source, leave_copy, false);
844 public class HoistedParameter : HoistedVariable
846 sealed class HoistedFieldAssign : CompilerAssign
848 public HoistedFieldAssign (Expression target, Expression source)
849 : base (target, source, target.Location)
853 protected override Expression ResolveConversions (ResolveContext ec)
856 // Implicit conversion check fails for hoisted type arguments
857 // as they are of different types (!!0 x !0)
863 readonly ParameterReference parameter;
865 public HoistedParameter (AnonymousMethodStorey scope, ParameterReference par)
866 : base (scope, par.Name, par.Type)
868 this.parameter = par;
871 public HoistedParameter (HoistedParameter hp, string name)
872 : base (hp.storey, name, hp.parameter.Type)
874 this.parameter = hp.parameter;
879 public bool IsAssigned { get; set; }
881 public ParameterReference Parameter {
889 public void EmitHoistingAssignment (EmitContext ec)
892 // Remove hoisted redirection to emit assignment from original parameter
894 var temp = parameter.Parameter.HoistedVariant;
895 parameter.Parameter.HoistedVariant = null;
897 var a = new HoistedFieldAssign (GetFieldExpression (ec), parameter);
898 a.EmitStatement (ec);
900 parameter.Parameter.HoistedVariant = temp;
904 class HoistedLocalVariable : HoistedVariable
906 public HoistedLocalVariable (AnonymousMethodStorey storey, LocalVariable local, string name)
907 : base (storey, name, local.Type)
912 public class HoistedThis : HoistedVariable
914 public HoistedThis (AnonymousMethodStorey storey, Field field)
915 : base (storey, field)
921 // Anonymous method expression as created by parser
923 public class AnonymousMethodExpression : Expression
926 // Special conversion for nested expression tree lambdas
928 class Quote : ShimExpression
930 public Quote (Expression expr)
935 public override Expression CreateExpressionTree (ResolveContext ec)
937 var args = new Arguments (1);
938 args.Add (new Argument (expr.CreateExpressionTree (ec)));
939 return CreateExpressionFactoryCall (ec, "Quote", args);
942 protected override Expression DoResolve (ResolveContext rc)
944 expr = expr.Resolve (rc);
948 eclass = expr.eclass;
954 readonly Dictionary<TypeSpec, Expression> compatibles;
956 public ParametersBlock Block;
958 public AnonymousMethodExpression (Location loc)
961 this.compatibles = new Dictionary<TypeSpec, Expression> ();
966 public override string ExprClassName {
968 return "anonymous method";
972 public virtual bool HasExplicitParameters {
974 return Parameters != ParametersCompiled.Undefined;
978 public override bool IsSideEffectFree {
984 public ParametersCompiled Parameters {
986 return Block.Parameters;
990 public ReportPrinter TypeInferenceReportPrinter {
997 // Returns true if the body of lambda expression can be implicitly
998 // converted to the delegate of type `delegate_type'
1000 public bool ImplicitStandardConversionExists (ResolveContext ec, TypeSpec delegate_type)
1002 using (ec.With (ResolveContext.Options.InferReturnType, false)) {
1003 using (ec.Set (ResolveContext.Options.ProbingMode)) {
1004 var prev = ec.Report.SetPrinter (TypeInferenceReportPrinter ?? new NullReportPrinter ());
1006 var res = Compatible (ec, delegate_type) != null;
1008 ec.Report.SetPrinter (prev);
1015 TypeSpec CompatibleChecks (ResolveContext ec, TypeSpec delegate_type)
1017 if (delegate_type.IsDelegate)
1018 return delegate_type;
1020 if (delegate_type.IsExpressionTreeType) {
1021 delegate_type = delegate_type.TypeArguments [0];
1022 if (delegate_type.IsDelegate)
1023 return delegate_type;
1025 ec.Report.Error (835, loc, "Cannot convert `{0}' to an expression tree of non-delegate type `{1}'",
1026 GetSignatureForError (), delegate_type.GetSignatureForError ());
1030 ec.Report.Error (1660, loc, "Cannot convert `{0}' to non-delegate type `{1}'",
1031 GetSignatureForError (), delegate_type.GetSignatureForError ());
1035 protected bool VerifyExplicitParameters (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type, AParametersCollection parameters)
1037 if (VerifyParameterCompatibility (ec, tic, delegate_type, parameters, ec.IsInProbingMode))
1040 if (!ec.IsInProbingMode)
1041 ec.Report.Error (1661, loc,
1042 "Cannot convert `{0}' to delegate type `{1}' since there is a parameter mismatch",
1043 GetSignatureForError (), delegate_type.GetSignatureForError ());
1048 protected bool VerifyParameterCompatibility (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type, AParametersCollection invoke_pd, bool ignore_errors)
1050 if (Parameters.Count != invoke_pd.Count) {
1054 ec.Report.Error (1593, loc, "Delegate `{0}' does not take `{1}' arguments",
1055 delegate_type.GetSignatureForError (), Parameters.Count.ToString ());
1059 bool has_implicit_parameters = !HasExplicitParameters;
1062 for (int i = 0; i < Parameters.Count; ++i) {
1063 Parameter.Modifier p_mod = invoke_pd.FixedParameters [i].ModFlags;
1064 if (Parameters.FixedParameters [i].ModFlags != p_mod && p_mod != Parameter.Modifier.PARAMS) {
1068 if (p_mod == Parameter.Modifier.NONE)
1069 ec.Report.Error (1677, Parameters[i].Location, "Parameter `{0}' should not be declared with the `{1}' keyword",
1070 (i + 1).ToString (), Parameter.GetModifierSignature (Parameters [i].ModFlags));
1072 ec.Report.Error (1676, Parameters[i].Location, "Parameter `{0}' must be declared with the `{1}' keyword",
1073 (i+1).ToString (), Parameter.GetModifierSignature (p_mod));
1077 if (has_implicit_parameters)
1080 TypeSpec type = invoke_pd.Types [i];
1083 type = tic.InflateGenericArgument (ec, type);
1085 if (!TypeSpecComparer.IsEqual (type, Parameters.Types [i])) {
1089 ec.Report.Error (1678, Parameters [i].Location, "Parameter `{0}' is declared as type `{1}' but should be `{2}'",
1091 Parameters.Types [i].GetSignatureForError (),
1092 invoke_pd.Types [i].GetSignatureForError ());
1101 // Infers type arguments based on explicit arguments
1103 public bool ExplicitTypeInference (TypeInferenceContext type_inference, TypeSpec delegate_type)
1105 if (!HasExplicitParameters)
1108 if (!delegate_type.IsDelegate) {
1109 if (!delegate_type.IsExpressionTreeType)
1112 delegate_type = TypeManager.GetTypeArguments (delegate_type) [0];
1113 if (!delegate_type.IsDelegate)
1117 AParametersCollection d_params = Delegate.GetParameters (delegate_type);
1118 if (d_params.Count != Parameters.Count)
1121 var ptypes = Parameters.Types;
1122 var dtypes = d_params.Types;
1123 for (int i = 0; i < Parameters.Count; ++i) {
1124 if (type_inference.ExactInference (ptypes[i], dtypes[i]) == 0) {
1126 // Continue when 0 (quick path) does not mean inference failure. Checking for
1127 // same type handles cases like int -> int
1129 if (ptypes[i] == dtypes[i])
1139 public TypeSpec InferReturnType (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type)
1142 AnonymousExpression am;
1144 if (compatibles.TryGetValue (delegate_type, out expr)) {
1145 am = expr as AnonymousExpression;
1146 return am == null ? null : am.ReturnType;
1149 using (ec.Set (ResolveContext.Options.ProbingMode | ResolveContext.Options.InferReturnType)) {
1151 if (TypeInferenceReportPrinter != null) {
1152 prev = ec.Report.SetPrinter (TypeInferenceReportPrinter);
1157 var body = CompatibleMethodBody (ec, tic, null, delegate_type);
1159 am = body.Compatible (ec, body);
1164 if (TypeInferenceReportPrinter != null) {
1165 ec.Report.SetPrinter (prev);
1172 // compatibles.Add (delegate_type, am);
1173 return am.ReturnType;
1176 public override bool ContainsEmitWithAwait ()
1182 // Returns AnonymousMethod container if this anonymous method
1183 // expression can be implicitly converted to the delegate type `delegate_type'
1185 public Expression Compatible (ResolveContext ec, TypeSpec type)
1188 if (compatibles.TryGetValue (type, out am))
1191 TypeSpec delegate_type = CompatibleChecks (ec, type);
1192 if (delegate_type == null)
1196 // At this point its the first time we know the return type that is
1197 // needed for the anonymous method. We create the method here.
1200 var invoke_mb = Delegate.GetInvokeMethod (delegate_type);
1201 TypeSpec return_type = invoke_mb.ReturnType;
1204 // Second: the return type of the delegate must be compatible with
1205 // the anonymous type. Instead of doing a pass to examine the block
1206 // we satisfy the rule by setting the return type on the EmitContext
1207 // to be the delegate type return type.
1210 var body = CompatibleMethodBody (ec, null, return_type, delegate_type);
1214 bool etree_conversion = delegate_type != type;
1217 if (etree_conversion) {
1218 if (ec.HasSet (ResolveContext.Options.ExpressionTreeConversion)) {
1220 // Nested expression tree lambda use same scope as parent
1221 // lambda, this also means no variable capturing between this
1224 am = body.Compatible (ec, ec.CurrentAnonymousMethod);
1227 // Quote nested expression tree
1230 am = new Quote (am);
1232 int errors = ec.Report.Errors;
1234 if (Block.IsAsync) {
1235 ec.Report.Error (1989, loc, "Async lambda expressions cannot be converted to expression trees");
1238 using (ec.Set (ResolveContext.Options.ExpressionTreeConversion)) {
1239 am = body.Compatible (ec);
1243 // Rewrite expressions into expression tree when targeting Expression<T>
1245 if (am != null && errors == ec.Report.Errors)
1246 am = CreateExpressionTree (ec, delegate_type);
1249 am = body.Compatible (ec);
1251 if (body.DirectMethodGroupConversion != null) {
1252 var errors_printer = new SessionReportPrinter ();
1253 var old = ec.Report.SetPrinter (errors_printer);
1254 var expr = new ImplicitDelegateCreation (delegate_type, body.DirectMethodGroupConversion, loc) {
1255 AllowSpecialMethodsInvocation = true
1257 ec.Report.SetPrinter (old);
1258 if (expr != null && errors_printer.ErrorsCount == 0)
1262 } catch (CompletionResult) {
1264 } catch (FatalException) {
1266 } catch (Exception e) {
1267 throw new InternalErrorException (e, loc);
1270 if (!ec.IsInProbingMode && !etree_conversion) {
1271 compatibles.Add (type, am ?? EmptyExpression.Null);
1277 protected virtual Expression CreateExpressionTree (ResolveContext ec, TypeSpec delegate_type)
1279 return CreateExpressionTree (ec);
1282 public override Expression CreateExpressionTree (ResolveContext ec)
1284 ec.Report.Error (1946, loc, "An anonymous method cannot be converted to an expression tree");
1288 protected virtual ParametersCompiled ResolveParameters (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type)
1290 var delegate_parameters = Delegate.GetParameters (delegate_type);
1292 if (Parameters == ParametersCompiled.Undefined) {
1294 // We provide a set of inaccessible parameters
1296 Parameter[] fixedpars = new Parameter[delegate_parameters.Count];
1298 for (int i = 0; i < delegate_parameters.Count; i++) {
1299 Parameter.Modifier i_mod = delegate_parameters.FixedParameters [i].ModFlags;
1300 if ((i_mod & Parameter.Modifier.OUT) != 0) {
1301 if (!ec.IsInProbingMode) {
1302 ec.Report.Error (1688, loc,
1303 "Cannot convert anonymous method block without a parameter list to delegate type `{0}' because it has one or more `out' parameters",
1304 delegate_type.GetSignatureForError ());
1309 fixedpars[i] = new Parameter (
1310 new TypeExpression (delegate_parameters.Types [i], loc), null,
1311 delegate_parameters.FixedParameters [i].ModFlags, null, loc);
1314 return ParametersCompiled.CreateFullyResolved (fixedpars, delegate_parameters.Types);
1317 if (!VerifyExplicitParameters (ec, tic, delegate_type, delegate_parameters)) {
1324 protected override Expression DoResolve (ResolveContext rc)
1326 if (rc.HasSet (ResolveContext.Options.ConstantScope)) {
1327 rc.Report.Error (1706, loc, "Anonymous methods and lambda expressions cannot be used in the current context");
1332 // Update top-level block generated duting parsing with actual top-level block
1334 if (rc.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.BaseInitializer) && rc.CurrentMemberDefinition.Parent.PartialContainer.PrimaryConstructorParameters != null) {
1335 var tb = rc.ConstructorBlock.ParametersBlock.TopBlock;
1336 if (Block.TopBlock != tb) {
1338 while (b.Parent != Block.TopBlock && b != Block.TopBlock)
1342 tb.IncludeBlock (Block, Block.TopBlock);
1343 b.ParametersBlock.TopBlock = tb;
1347 eclass = ExprClass.Value;
1350 // This hack means `The type is not accessible
1351 // anywhere', we depend on special conversion
1354 type = InternalType.AnonymousMethod;
1356 if (!DoResolveParameters (rc))
1362 protected virtual bool DoResolveParameters (ResolveContext rc)
1364 return Parameters.Resolve (rc);
1367 public override void Emit (EmitContext ec)
1369 // nothing, as we only exist to not do anything.
1372 public static void Error_AddressOfCapturedVar (ResolveContext rc, IVariableReference var, Location loc)
1374 if (rc.CurrentAnonymousMethod is AsyncInitializer)
1377 rc.Report.Error (1686, loc,
1378 "Local variable or parameter `{0}' cannot have their address taken and be used inside an anonymous method, lambda expression or query expression",
1382 public override string GetSignatureForError ()
1384 return ExprClassName;
1387 AnonymousMethodBody CompatibleMethodBody (ResolveContext ec, TypeInferenceContext tic, TypeSpec return_type, TypeSpec delegate_type)
1389 ParametersCompiled p = ResolveParameters (ec, tic, delegate_type);
1393 ParametersBlock b = ec.IsInProbingMode ? (ParametersBlock) Block.PerformClone () : Block;
1396 var rt = return_type;
1397 if (rt != null && rt.Kind != MemberKind.Void && rt != ec.Module.PredefinedTypes.Task.TypeSpec && !rt.IsGenericTask) {
1398 ec.Report.Error (4010, loc, "Cannot convert async {0} to delegate type `{1}'",
1399 GetSignatureForError (), delegate_type.GetSignatureForError ());
1404 b = b.ConvertToAsyncTask (ec, ec.CurrentMemberDefinition.Parent.PartialContainer, p, return_type, delegate_type, loc);
1407 return CompatibleMethodFactory (return_type ?? InternalType.ErrorType, delegate_type, p, b);
1410 protected virtual AnonymousMethodBody CompatibleMethodFactory (TypeSpec return_type, TypeSpec delegate_type, ParametersCompiled p, ParametersBlock b)
1412 return new AnonymousMethodBody (p, b, return_type, delegate_type, loc);
1415 protected override void CloneTo (CloneContext clonectx, Expression t)
1417 AnonymousMethodExpression target = (AnonymousMethodExpression) t;
1419 target.Block = (ParametersBlock) clonectx.LookupBlock (Block);
1422 public override object Accept (StructuralVisitor visitor)
1424 return visitor.Visit (this);
1429 // Abstract expression for any block which requires variables hoisting
1431 public abstract class AnonymousExpression : ExpressionStatement
1433 protected class AnonymousMethodMethod : Method
1435 public readonly AnonymousExpression AnonymousMethod;
1436 public readonly AnonymousMethodStorey Storey;
1438 public AnonymousMethodMethod (TypeDefinition parent, AnonymousExpression am, AnonymousMethodStorey storey,
1439 TypeExpr return_type,
1440 Modifiers mod, MemberName name,
1441 ParametersCompiled parameters)
1442 : base (parent, return_type, mod | Modifiers.COMPILER_GENERATED,
1443 name, parameters, null)
1445 this.AnonymousMethod = am;
1446 this.Storey = storey;
1448 Parent.PartialContainer.Members.Add (this);
1449 Block = new ToplevelBlock (am.block, parameters);
1452 public override EmitContext CreateEmitContext (ILGenerator ig, SourceMethodBuilder sourceMethod)
1454 EmitContext ec = new EmitContext (this, ig, ReturnType, sourceMethod);
1455 ec.CurrentAnonymousMethod = AnonymousMethod;
1459 protected override void DefineTypeParameters ()
1461 // Type parameters were cloned
1464 protected override bool ResolveMemberType ()
1466 if (!base.ResolveMemberType ())
1469 if (Storey != null && Storey.Mutator != null) {
1470 if (!parameters.IsEmpty) {
1471 var mutated = Storey.Mutator.Mutate (parameters.Types);
1472 if (mutated != parameters.Types)
1473 parameters = ParametersCompiled.CreateFullyResolved ((Parameter[]) parameters.FixedParameters, mutated);
1476 member_type = Storey.Mutator.Mutate (member_type);
1482 public override void Emit ()
1484 if (MethodBuilder == null) {
1492 protected readonly ParametersBlock block;
1494 public TypeSpec ReturnType;
1496 protected AnonymousExpression (ParametersBlock block, TypeSpec return_type, Location loc)
1498 this.ReturnType = return_type;
1503 public abstract string ContainerType { get; }
1504 public abstract bool IsIterator { get; }
1505 public abstract AnonymousMethodStorey Storey { get; }
1508 // The block that makes up the body for the anonymous method
1510 public ParametersBlock Block {
1516 public AnonymousExpression Compatible (ResolveContext ec)
1518 return Compatible (ec, this);
1521 public AnonymousExpression Compatible (ResolveContext ec, AnonymousExpression ae)
1526 // TODO: Implement clone
1527 BlockContext aec = new BlockContext (ec, block, ReturnType);
1528 aec.CurrentAnonymousMethod = ae;
1530 var am = this as AnonymousMethodBody;
1532 if (ec.HasSet (ResolveContext.Options.InferReturnType) && am != null) {
1533 am.ReturnTypeInference = new TypeInferenceContext ();
1536 var bc = ec as BlockContext;
1539 aec.AssignmentInfoOffset = bc.AssignmentInfoOffset;
1540 aec.EnclosingLoop = bc.EnclosingLoop;
1541 aec.EnclosingLoopOrSwitch = bc.EnclosingLoopOrSwitch;
1542 aec.Switch = bc.Switch;
1545 var errors = ec.Report.Errors;
1547 bool res = Block.Resolve (aec);
1549 if (res && errors == ec.Report.Errors) {
1550 MarkReachable (new Reachability ());
1552 if (!CheckReachableExit (ec.Report)) {
1557 bc.AssignmentInfoOffset = aec.AssignmentInfoOffset;
1560 if (am != null && am.ReturnTypeInference != null) {
1561 am.ReturnTypeInference.FixAllTypes (ec);
1562 ReturnType = am.ReturnTypeInference.InferredTypeArguments [0];
1563 am.ReturnTypeInference = null;
1566 // If e is synchronous the inferred return type is T
1567 // If e is asynchronous and the body of F is either an expression classified as nothing
1568 // or a statement block where no return statements have expressions, the inferred return type is Task
1569 // If e is async and has an inferred result type T, the inferred return type is Task<T>
1571 if (block.IsAsync && ReturnType != null) {
1572 ReturnType = ReturnType.Kind == MemberKind.Void ?
1573 ec.Module.PredefinedTypes.Task.TypeSpec :
1574 ec.Module.PredefinedTypes.TaskGeneric.TypeSpec.MakeGenericType (ec, new [] { ReturnType });
1578 if (res && errors != ec.Report.Errors)
1581 return res ? this : null;
1584 public override bool ContainsEmitWithAwait ()
1589 bool CheckReachableExit (Report report)
1591 if (block.HasReachableClosingBrace && ReturnType.Kind != MemberKind.Void) {
1592 // FIXME: Flow-analysis on MoveNext generated code
1594 report.Error (1643, StartLocation,
1595 "Not all code paths return a value in anonymous method of type `{0}'", GetSignatureForError ());
1604 public override void FlowAnalysis (FlowAnalysisContext fc)
1606 // We are reachable, mark block body reachable too
1607 MarkReachable (new Reachability ());
1609 CheckReachableExit (fc.Report);
1611 var das = fc.BranchDefiniteAssignment ();
1612 var prev_pb = fc.ParametersBlock;
1613 fc.ParametersBlock = Block;
1614 var da_ontrue = fc.DefiniteAssignmentOnTrue;
1615 var da_onfalse = fc.DefiniteAssignmentOnFalse;
1617 fc.DefiniteAssignmentOnTrue = fc.DefiniteAssignmentOnFalse = null;
1618 block.FlowAnalysis (fc);
1620 fc.ParametersBlock = prev_pb;
1621 fc.DefiniteAssignment = das;
1622 fc.DefiniteAssignmentOnTrue = da_ontrue;
1623 fc.DefiniteAssignmentOnFalse = da_onfalse;
1626 public override void MarkReachable (Reachability rc)
1628 block.MarkReachable (rc);
1631 public void SetHasThisAccess ()
1633 ExplicitBlock b = block;
1635 if (b.HasCapturedThis)
1638 b.HasCapturedThis = true;
1639 b = b.Parent == null ? null : b.Parent.Explicit;
1640 } while (b != null);
1644 public class AnonymousMethodBody : AnonymousExpression
1646 protected readonly ParametersCompiled parameters;
1647 AnonymousMethodStorey storey;
1649 AnonymousMethodMethod method;
1652 TypeInferenceContext return_inference;
1654 public AnonymousMethodBody (ParametersCompiled parameters,
1655 ParametersBlock block, TypeSpec return_type, TypeSpec delegate_type,
1657 : base (block, return_type, loc)
1659 this.type = delegate_type;
1660 this.parameters = parameters;
1665 public override string ContainerType {
1666 get { return "anonymous method"; }
1670 // Method-group instance for lambdas which can be replaced with
1671 // simple method group call
1673 public MethodGroupExpr DirectMethodGroupConversion {
1677 public override bool IsIterator {
1683 public ParametersCompiled Parameters {
1689 public TypeInferenceContext ReturnTypeInference {
1691 return return_inference;
1694 return_inference = value;
1698 public override AnonymousMethodStorey Storey {
1706 public override Expression CreateExpressionTree (ResolveContext ec)
1708 ec.Report.Error (1945, loc, "An expression tree cannot contain an anonymous method expression");
1712 bool Define (ResolveContext ec)
1714 if (!Block.Resolved && Compatible (ec) == null)
1717 if (block_name == null) {
1718 MemberCore mc = (MemberCore) ec.MemberContext;
1719 block_name = mc.MemberName.Basename;
1726 // Creates a host for the anonymous method
1728 AnonymousMethodMethod DoCreateMethodHost (EmitContext ec)
1731 // Anonymous method body can be converted to
1733 // 1, an instance method in current scope when only `this' is hoisted
1734 // 2, a static method in current scope when neither `this' nor any variable is hoisted
1735 // 3, an instance method in compiler generated storey when any hoisted variable exists
1738 Modifiers modifiers;
1739 TypeDefinition parent = null;
1740 TypeParameters hoisted_tparams = null;
1741 ParametersCompiled method_parameters = parameters;
1743 var src_block = Block.Original.Explicit;
1744 if (src_block.HasCapturedVariable || src_block.HasCapturedThis) {
1745 parent = storey = FindBestMethodStorey ();
1747 if (storey == null) {
1748 var top_block = src_block.ParametersBlock.TopBlock;
1749 var sm = top_block.StateMachine;
1751 if (src_block.HasCapturedThis) {
1753 // Remove hoisted 'this' request when simple instance method is
1754 // enough. No hoisted variables only 'this' and don't need to
1755 // propagate this to value type state machine.
1757 StateMachine sm_parent;
1758 var pb = src_block.ParametersBlock;
1760 sm_parent = pb.StateMachine;
1761 pb = pb.Parent == null ? null : pb.Parent.ParametersBlock;
1762 } while (sm_parent == null && pb != null);
1764 if (sm_parent == null) {
1765 top_block.RemoveThisReferenceFromChildrenBlock (src_block);
1766 } else if (sm_parent.Kind == MemberKind.Struct) {
1768 // Special case where parent class is used to emit instance method
1769 // because currect storey is of value type (async host) and we cannot
1770 // use ldftn on non-boxed instances either to share mutated state
1772 parent = sm_parent.Parent.PartialContainer;
1773 hoisted_tparams = sm_parent.OriginalTypeParameters;
1774 } else if (sm is IteratorStorey) {
1776 // For iterators we can host everything in one class
1778 parent = storey = sm;
1783 modifiers = storey != null ? Modifiers.INTERNAL : Modifiers.PRIVATE;
1785 if (ec.CurrentAnonymousMethod != null)
1786 parent = storey = ec.CurrentAnonymousMethod.Storey;
1788 modifiers = Modifiers.STATIC | Modifiers.PRIVATE;
1791 // Convert generated method to closed delegate method where unused
1792 // this argument is generated during compilation which speeds up dispatch
1795 // Unused as it breaks compatibility
1797 // method_parameters = ParametersCompiled.Prefix (method_parameters,
1798 // new Parameter (null, null, 0, null, loc), ec.Module.Compiler.BuiltinTypes.Object);
1801 if (storey == null && hoisted_tparams == null)
1802 hoisted_tparams = ec.CurrentTypeParameters;
1805 parent = ec.CurrentTypeDefinition.Parent.PartialContainer;
1807 string name = CompilerGeneratedContainer.MakeName (parent != storey ? block_name : null,
1808 "m", null, parent.PartialContainer.CounterAnonymousMethods++);
1810 MemberName member_name;
1811 if (hoisted_tparams != null) {
1812 var type_params = new TypeParameters (hoisted_tparams.Count);
1813 for (int i = 0; i < hoisted_tparams.Count; ++i) {
1814 type_params.Add (hoisted_tparams[i].CreateHoistedCopy (null));
1817 member_name = new MemberName (name, type_params, Location);
1819 member_name = new MemberName (name, Location);
1822 return new AnonymousMethodMethod (parent,
1823 this, storey, new TypeExpression (ReturnType, Location), modifiers,
1824 member_name, method_parameters);
1827 protected override Expression DoResolve (ResolveContext ec)
1832 eclass = ExprClass.Value;
1836 public override void Emit (EmitContext ec)
1839 // Use same anonymous method implementation for scenarios where same
1840 // code is used from multiple blocks, e.g. field initializers
1842 if (method == null) {
1844 // Delay an anonymous method definition to avoid emitting unused code
1845 // for unreachable blocks or expression trees
1847 method = DoCreateMethodHost (ec);
1849 method.PrepareEmit ();
1852 bool is_static = (method.ModFlags & Modifiers.STATIC) != 0;
1853 if (is_static && am_cache == null && !ec.IsStaticConstructor) {
1855 // Creates a field cache to store delegate instance if it's not generic
1857 if (!method.MemberName.IsGeneric) {
1858 var parent = method.Parent.PartialContainer;
1859 int id = parent.AnonymousMethodsCounter++;
1860 var cache_type = storey != null && storey.Mutator != null ? storey.Mutator.Mutate (type) : type;
1862 am_cache = new Field (parent, new TypeExpression (cache_type, loc),
1863 Modifiers.STATIC | Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED,
1864 new MemberName (CompilerGeneratedContainer.MakeName (null, "f", "am$cache", id), loc), null);
1866 parent.AddField (am_cache);
1868 // TODO: Implement caching of generated generic static methods
1872 // Some extra class is needed to capture variable generic type
1873 // arguments. Maybe we could re-use anonymous types, with a unique
1874 // anonymous method id, but they are quite heavy.
1876 // Consider : "() => typeof(T);"
1878 // We need something like
1879 // static class Wrap<Tn, Tm, DelegateType> {
1880 // public static DelegateType cache;
1883 // We then specialize local variable to capture all generic parameters
1884 // and delegate type, e.g. "Wrap<Ta, Tb, DelegateTypeInst> cache;"
1889 Label l_initialized = ec.DefineLabel ();
1891 if (am_cache != null) {
1892 ec.Emit (OpCodes.Ldsfld, am_cache.Spec);
1893 ec.Emit (OpCodes.Brtrue_S, l_initialized);
1897 // Load method delegate implementation
1902 } else if (storey != null) {
1903 Expression e = storey.GetStoreyInstanceExpression (ec).Resolve (new ResolveContext (ec.MemberContext));
1911 // Special case for value type storey where this is not lifted but
1912 // droped off to parent class
1914 if (ec.CurrentAnonymousMethod != null && ec.AsyncTaskStorey != null)
1915 ec.Emit (OpCodes.Ldfld, ec.AsyncTaskStorey.HoistedThis.Field.Spec);
1918 var delegate_method = method.Spec;
1919 if (storey != null && storey.MemberName.IsGeneric) {
1920 TypeSpec t = storey.Instance.Type;
1923 // Mutate anonymous method instance type if we are in nested
1924 // hoisted generic anonymous method storey
1926 if (ec.IsAnonymousStoreyMutateRequired) {
1927 t = storey.Mutator.Mutate (t);
1930 ec.Emit (OpCodes.Ldftn, TypeBuilder.GetMethod (t.GetMetaInfo (), (MethodInfo) delegate_method.GetMetaInfo ()));
1932 if (delegate_method.IsGeneric) {
1933 TypeParameterSpec[] tparams;
1934 var sm = ec.CurrentAnonymousMethod == null ? null : ec.CurrentAnonymousMethod.Storey as StateMachine;
1935 if (sm != null && sm.OriginalTypeParameters != null) {
1936 tparams = sm.CurrentTypeParameters.Types;
1938 tparams = method.TypeParameters;
1941 delegate_method = delegate_method.MakeGenericMethod (ec.MemberContext, tparams);
1944 ec.Emit (OpCodes.Ldftn, delegate_method);
1947 var constructor_method = Delegate.GetConstructor (type);
1948 ec.Emit (OpCodes.Newobj, constructor_method);
1950 if (am_cache != null) {
1951 ec.Emit (OpCodes.Stsfld, am_cache.Spec);
1952 ec.MarkLabel (l_initialized);
1953 ec.Emit (OpCodes.Ldsfld, am_cache.Spec);
1957 public override void EmitStatement (EmitContext ec)
1959 throw new NotImplementedException ();
1963 // Look for the best storey for this anonymous method
1965 AnonymousMethodStorey FindBestMethodStorey ()
1968 // Use the nearest parent block which has a storey
1970 for (Block b = Block.Parent; b != null; b = b.Parent) {
1971 AnonymousMethodStorey s = b.Explicit.AnonymousMethodStorey;
1979 public override string GetSignatureForError ()
1981 return type.GetSignatureForError ();
1986 // Anonymous type container
1988 public class AnonymousTypeClass : CompilerGeneratedContainer
1990 public const string ClassNamePrefix = "<>__AnonType";
1991 public const string SignatureForError = "anonymous type";
1993 readonly IList<AnonymousTypeParameter> parameters;
1995 private AnonymousTypeClass (ModuleContainer parent, MemberName name, IList<AnonymousTypeParameter> parameters, Location loc)
1996 : base (parent, name, parent.Evaluator != null ? Modifiers.PUBLIC : Modifiers.INTERNAL)
1998 this.parameters = parameters;
2001 public static AnonymousTypeClass Create (TypeContainer parent, IList<AnonymousTypeParameter> parameters, Location loc)
2003 string name = ClassNamePrefix + parent.Module.CounterAnonymousTypes++;
2005 ParametersCompiled all_parameters;
2006 TypeParameters tparams = null;
2007 SimpleName[] t_args;
2009 if (parameters.Count == 0) {
2010 all_parameters = ParametersCompiled.EmptyReadOnlyParameters;
2013 t_args = new SimpleName[parameters.Count];
2014 tparams = new TypeParameters ();
2015 Parameter[] ctor_params = new Parameter[parameters.Count];
2016 for (int i = 0; i < parameters.Count; ++i) {
2017 AnonymousTypeParameter p = parameters[i];
2018 for (int ii = 0; ii < i; ++ii) {
2019 if (parameters[ii].Name == p.Name) {
2020 parent.Compiler.Report.Error (833, parameters[ii].Location,
2021 "`{0}': An anonymous type cannot have multiple properties with the same name",
2024 p = new AnonymousTypeParameter (null, "$" + i.ToString (), p.Location);
2030 t_args[i] = new SimpleName ("<" + p.Name + ">__T", p.Location);
2031 tparams.Add (new TypeParameter (i, new MemberName (t_args[i].Name, p.Location), null, null, Variance.None));
2032 ctor_params[i] = new Parameter (t_args[i], p.Name, Parameter.Modifier.NONE, null, p.Location);
2035 all_parameters = new ParametersCompiled (ctor_params);
2039 // Create generic anonymous type host with generic arguments
2040 // named upon properties names
2042 AnonymousTypeClass a_type = new AnonymousTypeClass (parent.Module, new MemberName (name, tparams, loc), parameters, loc);
2044 Constructor c = new Constructor (a_type, name, Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN,
2045 null, all_parameters, loc);
2046 c.Block = new ToplevelBlock (parent.Module.Compiler, c.ParameterInfo, loc);
2049 // Create fields and constructor body with field initialization
2052 for (int i = 0; i < parameters.Count; ++i) {
2053 AnonymousTypeParameter p = parameters [i];
2055 Field f = new Field (a_type, t_args [i], Modifiers.PRIVATE | Modifiers.READONLY | Modifiers.DEBUGGER_HIDDEN,
2056 new MemberName ("<" + p.Name + ">", p.Location), null);
2058 if (!a_type.AddField (f)) {
2063 c.Block.AddStatement (new StatementExpression (
2064 new SimpleAssign (new MemberAccess (new This (p.Location), f.Name),
2065 c.Block.GetParameterReference (i, p.Location))));
2067 ToplevelBlock get_block = new ToplevelBlock (parent.Module.Compiler, p.Location);
2068 get_block.AddStatement (new Return (
2069 new MemberAccess (new This (p.Location), f.Name), p.Location));
2071 Property prop = new Property (a_type, t_args [i], Modifiers.PUBLIC,
2072 new MemberName (p.Name, p.Location), null);
2073 prop.Get = new Property.GetMethod (prop, 0, null, p.Location);
2074 prop.Get.Block = get_block;
2075 a_type.AddMember (prop);
2081 a_type.AddConstructor (c);
2085 protected override bool DoDefineMembers ()
2087 if (!base.DoDefineMembers ())
2090 Location loc = Location;
2092 var equals_parameters = ParametersCompiled.CreateFullyResolved (
2093 new Parameter (new TypeExpression (Compiler.BuiltinTypes.Object, loc), "obj", 0, null, loc), Compiler.BuiltinTypes.Object);
2095 Method equals = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Bool, loc),
2096 Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("Equals", loc),
2097 equals_parameters, null);
2099 equals_parameters[0].Resolve (equals, 0);
2101 Method tostring = new Method (this, new TypeExpression (Compiler.BuiltinTypes.String, loc),
2102 Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("ToString", loc),
2103 ParametersCompiled.EmptyReadOnlyParameters, null);
2105 ToplevelBlock equals_block = new ToplevelBlock (Compiler, equals.ParameterInfo, loc);
2107 TypeExpr current_type;
2108 if (CurrentTypeParameters != null) {
2109 var targs = new TypeArguments ();
2110 for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
2111 targs.Add (new TypeParameterExpr (CurrentTypeParameters[i], Location));
2114 current_type = new GenericTypeExpr (Definition, targs, loc);
2116 current_type = new TypeExpression (Definition, loc);
2119 var li_other = LocalVariable.CreateCompilerGenerated (CurrentType, equals_block, loc);
2120 equals_block.AddStatement (new BlockVariable (new TypeExpression (li_other.Type, loc), li_other));
2121 var other_variable = new LocalVariableReference (li_other, loc);
2123 MemberAccess system_collections_generic = new MemberAccess (new MemberAccess (
2124 new QualifiedAliasMember ("global", "System", loc), "Collections", loc), "Generic", loc);
2126 Expression rs_equals = null;
2127 Expression string_concat = new StringConstant (Compiler.BuiltinTypes, "{", loc);
2128 Expression rs_hashcode = new IntConstant (Compiler.BuiltinTypes, -2128831035, loc);
2129 for (int i = 0; i < parameters.Count; ++i) {
2130 var p = parameters [i];
2131 var f = (Field) Members [i * 2];
2133 MemberAccess equality_comparer = new MemberAccess (new MemberAccess (
2134 system_collections_generic, "EqualityComparer",
2135 new TypeArguments (new SimpleName (CurrentTypeParameters [i].Name, loc)), loc),
2138 Arguments arguments_equal = new Arguments (2);
2139 arguments_equal.Add (new Argument (new MemberAccess (new This (f.Location), f.Name)));
2140 arguments_equal.Add (new Argument (new MemberAccess (other_variable, f.Name)));
2142 Expression field_equal = new Invocation (new MemberAccess (equality_comparer,
2143 "Equals", loc), arguments_equal);
2145 Arguments arguments_hashcode = new Arguments (1);
2146 arguments_hashcode.Add (new Argument (new MemberAccess (new This (f.Location), f.Name)));
2147 Expression field_hashcode = new Invocation (new MemberAccess (equality_comparer,
2148 "GetHashCode", loc), arguments_hashcode);
2150 IntConstant FNV_prime = new IntConstant (Compiler.BuiltinTypes, 16777619, loc);
2151 rs_hashcode = new Binary (Binary.Operator.Multiply,
2152 new Binary (Binary.Operator.ExclusiveOr, rs_hashcode, field_hashcode),
2155 Expression field_to_string = new Conditional (new BooleanExpression (new Binary (Binary.Operator.Inequality,
2156 new MemberAccess (new This (f.Location), f.Name), new NullLiteral (loc))),
2157 new Invocation (new MemberAccess (
2158 new MemberAccess (new This (f.Location), f.Name), "ToString"), null),
2159 new StringConstant (Compiler.BuiltinTypes, string.Empty, loc), loc);
2161 if (rs_equals == null) {
2162 rs_equals = field_equal;
2163 string_concat = new Binary (Binary.Operator.Addition,
2165 new Binary (Binary.Operator.Addition,
2166 new StringConstant (Compiler.BuiltinTypes, " " + p.Name + " = ", loc),
2172 // Implementation of ToString () body using string concatenation
2174 string_concat = new Binary (Binary.Operator.Addition,
2175 new Binary (Binary.Operator.Addition,
2177 new StringConstant (Compiler.BuiltinTypes, ", " + p.Name + " = ", loc)),
2180 rs_equals = new Binary (Binary.Operator.LogicalAnd, rs_equals, field_equal);
2183 string_concat = new Binary (Binary.Operator.Addition,
2185 new StringConstant (Compiler.BuiltinTypes, " }", loc));
2188 // Equals (object obj) override
2190 var other_variable_assign = new TemporaryVariableReference (li_other, loc);
2191 equals_block.AddStatement (new StatementExpression (
2192 new SimpleAssign (other_variable_assign,
2193 new As (equals_block.GetParameterReference (0, loc),
2194 current_type, loc), loc)));
2196 Expression equals_test = new Binary (Binary.Operator.Inequality, other_variable, new NullLiteral (loc));
2197 if (rs_equals != null)
2198 equals_test = new Binary (Binary.Operator.LogicalAnd, equals_test, rs_equals);
2199 equals_block.AddStatement (new Return (equals_test, loc));
2201 equals.Block = equals_block;
2203 Members.Add (equals);
2206 // GetHashCode () override
2208 Method hashcode = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Int, loc),
2209 Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN,
2210 new MemberName ("GetHashCode", loc),
2211 ParametersCompiled.EmptyReadOnlyParameters, null);
2214 // Modified FNV with good avalanche behavior and uniform
2215 // distribution with larger hash sizes.
2217 // const int FNV_prime = 16777619;
2218 // int hash = (int) 2166136261;
2219 // foreach (int d in data)
2220 // hash = (hash ^ d) * FNV_prime;
2221 // hash += hash << 13;
2222 // hash ^= hash >> 7;
2223 // hash += hash << 3;
2224 // hash ^= hash >> 17;
2225 // hash += hash << 5;
2227 ToplevelBlock hashcode_top = new ToplevelBlock (Compiler, loc);
2228 Block hashcode_block = new Block (hashcode_top, loc, loc);
2229 hashcode_top.AddStatement (new Unchecked (hashcode_block, loc));
2231 var li_hash = LocalVariable.CreateCompilerGenerated (Compiler.BuiltinTypes.Int, hashcode_top, loc);
2232 hashcode_block.AddStatement (new BlockVariable (new TypeExpression (li_hash.Type, loc), li_hash));
2233 LocalVariableReference hash_variable_assign = new LocalVariableReference (li_hash, loc);
2234 hashcode_block.AddStatement (new StatementExpression (
2235 new SimpleAssign (hash_variable_assign, rs_hashcode)));
2237 var hash_variable = new LocalVariableReference (li_hash, loc);
2238 hashcode_block.AddStatement (new StatementExpression (
2239 new CompoundAssign (Binary.Operator.Addition, hash_variable,
2240 new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 13, loc)))));
2241 hashcode_block.AddStatement (new StatementExpression (
2242 new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
2243 new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 7, loc)))));
2244 hashcode_block.AddStatement (new StatementExpression (
2245 new CompoundAssign (Binary.Operator.Addition, hash_variable,
2246 new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 3, loc)))));
2247 hashcode_block.AddStatement (new StatementExpression (
2248 new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
2249 new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 17, loc)))));
2250 hashcode_block.AddStatement (new StatementExpression (
2251 new CompoundAssign (Binary.Operator.Addition, hash_variable,
2252 new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 5, loc)))));
2254 hashcode_block.AddStatement (new Return (hash_variable, loc));
2255 hashcode.Block = hashcode_top;
2257 Members.Add (hashcode);
2260 // ToString () override
2263 ToplevelBlock tostring_block = new ToplevelBlock (Compiler, loc);
2264 tostring_block.AddStatement (new Return (string_concat, loc));
2265 tostring.Block = tostring_block;
2267 Members.Add (tostring);
2272 public override string GetSignatureForError ()
2274 return SignatureForError;
2277 public override CompilationSourceFile GetCompilationSourceFile ()
2282 public IList<AnonymousTypeParameter> Parameters {