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;
195 public ThisInitializer (HoistedThis hoisted_this)
197 this.hoisted_this = hoisted_this;
200 protected override void DoEmit (EmitContext ec)
202 hoisted_this.EmitAssign (ec, new CompilerGeneratedThis (ec.CurrentType, loc), false, false);
205 protected override void CloneTo (CloneContext clonectx, Statement target)
212 public readonly int ID;
214 public readonly ExplicitBlock OriginalSourceBlock;
216 // A list of StoreyFieldPair with local field keeping parent storey instance
217 List<StoreyFieldPair> used_parent_storeys;
218 List<ExplicitBlock> children_references;
220 // A list of hoisted parameters
221 protected List<HoistedParameter> hoisted_params;
222 List<HoistedParameter> hoisted_local_params;
223 protected List<HoistedVariable> hoisted_locals;
226 protected HoistedThis hoisted_this;
228 // Local variable which holds this storey instance
229 public Expression Instance;
231 bool initialize_hoisted_this;
233 public AnonymousMethodStorey (ExplicitBlock block, TypeDefinition parent, MemberBase host, TypeParameters tparams, string name, MemberKind kind)
234 : base (parent, MakeMemberName (host, name, parent.Module.CounterAnonymousContainers, tparams, block.StartLocation),
237 OriginalSourceBlock = block;
238 ID = parent.Module.CounterAnonymousContainers++;
241 public void AddCapturedThisField (EmitContext ec)
243 TypeExpr type_expr = new TypeExpression (ec.CurrentType, Location);
244 Field f = AddCompilerGeneratedField ("$this", type_expr);
245 hoisted_this = new HoistedThis (this, f);
247 initialize_hoisted_this = true;
250 public Field AddCapturedVariable (string name, TypeSpec type)
252 CheckMembersDefined ();
254 FullNamedExpression field_type = new TypeExpression (type, Location);
255 if (!spec.IsGenericOrParentIsGeneric)
256 return AddCompilerGeneratedField (name, field_type);
258 const Modifiers mod = Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED;
259 Field f = new HoistedField (this, field_type, mod, name, null, Location);
264 protected Field AddCompilerGeneratedField (string name, FullNamedExpression type)
266 return AddCompilerGeneratedField (name, type, false);
269 protected Field AddCompilerGeneratedField (string name, FullNamedExpression type, bool privateAccess)
271 Modifiers mod = Modifiers.COMPILER_GENERATED | (privateAccess ? Modifiers.PRIVATE : Modifiers.INTERNAL);
272 Field f = new Field (this, type, mod, new MemberName (name, Location), null);
278 // Creates a link between hoisted variable block and the anonymous method storey
280 // An anonymous method can reference variables from any outer block, but they are
281 // hoisted in their own ExplicitBlock. When more than one block is referenced we
282 // need to create another link between those variable storeys
284 public void AddReferenceFromChildrenBlock (ExplicitBlock block)
286 if (children_references == null)
287 children_references = new List<ExplicitBlock> ();
289 if (!children_references.Contains (block))
290 children_references.Add (block);
293 public void AddParentStoreyReference (EmitContext ec, AnonymousMethodStorey storey)
295 CheckMembersDefined ();
297 if (used_parent_storeys == null)
298 used_parent_storeys = new List<StoreyFieldPair> ();
299 else if (used_parent_storeys.Exists (i => i.Storey == storey))
302 TypeExpr type_expr = storey.CreateStoreyTypeExpression (ec);
303 Field f = AddCompilerGeneratedField ("<>f__ref$" + storey.ID, type_expr);
304 used_parent_storeys.Add (new StoreyFieldPair (storey, f));
307 public void CaptureLocalVariable (ResolveContext ec, LocalVariable localVariable)
309 if (this is StateMachine) {
310 if (ec.CurrentBlock.ParametersBlock != localVariable.Block.ParametersBlock)
311 ec.CurrentBlock.Explicit.HasCapturedVariable = true;
313 ec.CurrentBlock.Explicit.HasCapturedVariable = true;
316 var hoisted = localVariable.HoistedVariant;
317 if (hoisted != null && hoisted.Storey != this && hoisted.Storey is StateMachine) {
318 // TODO: It's too late the field is defined in HoistedLocalVariable ctor
319 hoisted.Storey.hoisted_locals.Remove (hoisted);
323 if (hoisted == null) {
324 hoisted = new HoistedLocalVariable (this, localVariable, GetVariableMangledName (localVariable));
325 localVariable.HoistedVariant = hoisted;
327 if (hoisted_locals == null)
328 hoisted_locals = new List<HoistedVariable> ();
330 hoisted_locals.Add (hoisted);
333 if (ec.CurrentBlock.Explicit != localVariable.Block.Explicit && !(hoisted.Storey is StateMachine))
334 hoisted.Storey.AddReferenceFromChildrenBlock (ec.CurrentBlock.Explicit);
337 public void CaptureParameter (ResolveContext ec, ParametersBlock.ParameterInfo parameterInfo, ParameterReference parameterReference)
339 if (!(this is StateMachine)) {
340 ec.CurrentBlock.Explicit.HasCapturedVariable = true;
343 var hoisted = parameterInfo.Parameter.HoistedVariant;
345 if (parameterInfo.Block.StateMachine != null) {
347 // Another storey in same block exists but state machine does not
348 // have parameter captured. We need to add it there as well to
349 // proxy parameter value correctly.
351 if (hoisted == null && parameterInfo.Block.StateMachine != this) {
352 var storey = parameterInfo.Block.StateMachine;
354 hoisted = new HoistedParameter (storey, parameterReference);
355 parameterInfo.Parameter.HoistedVariant = hoisted;
357 if (storey.hoisted_params == null)
358 storey.hoisted_params = new List<HoistedParameter> ();
360 storey.hoisted_params.Add (hoisted);
364 // Lift captured parameter from value type storey to reference type one. Otherwise
365 // any side effects would be done on a copy
367 if (hoisted != null && hoisted.Storey != this && hoisted.Storey is StateMachine) {
368 if (hoisted_local_params == null)
369 hoisted_local_params = new List<HoistedParameter> ();
371 hoisted_local_params.Add (hoisted);
376 if (hoisted == null) {
377 hoisted = new HoistedParameter (this, parameterReference);
378 parameterInfo.Parameter.HoistedVariant = hoisted;
380 if (hoisted_params == null)
381 hoisted_params = new List<HoistedParameter> ();
383 hoisted_params.Add (hoisted);
387 // Register link between current block and parameter storey. It will
388 // be used when setting up storey definition to deploy storey reference
389 // when parameters are used from multiple blocks
391 if (ec.CurrentBlock.Explicit != parameterInfo.Block) {
392 hoisted.Storey.AddReferenceFromChildrenBlock (ec.CurrentBlock.Explicit);
396 TypeExpr CreateStoreyTypeExpression (EmitContext ec)
399 // Create an instance of storey type
401 TypeExpr storey_type_expr;
402 if (CurrentTypeParameters != null) {
404 // Use current method type parameter (MVAR) for top level storey only. All
405 // nested storeys use class type parameter (VAR)
407 var tparams = ec.CurrentAnonymousMethod != null && ec.CurrentAnonymousMethod.Storey != null ?
408 ec.CurrentAnonymousMethod.Storey.CurrentTypeParameters :
409 ec.CurrentTypeParameters;
411 TypeArguments targs = new TypeArguments ();
414 // Use type parameter name instead of resolved type parameter
415 // specification to resolve to correctly nested type parameters
417 for (int i = 0; i < tparams.Count; ++i)
418 targs.Add (new SimpleName (tparams [i].Name, Location)); // new TypeParameterExpr (tparams[i], Location));
420 storey_type_expr = new GenericTypeExpr (Definition, targs, Location);
422 storey_type_expr = new TypeExpression (CurrentType, Location);
425 return storey_type_expr;
428 public void SetNestedStoryParent (AnonymousMethodStorey parentStorey)
430 Parent = parentStorey;
431 spec.IsGeneric = false;
432 spec.DeclaringType = parentStorey.CurrentType;
433 MemberName.TypeParameters = null;
436 protected override bool DoResolveTypeParameters ()
438 // Although any storey can have type parameters they are all clones of method type
439 // parameters therefore have to mutate MVAR references in any of cloned constraints
440 if (CurrentTypeParameters != null) {
441 for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
442 var spec = CurrentTypeParameters[i].Type;
443 spec.BaseType = mutator.Mutate (spec.BaseType);
444 if (spec.InterfacesDefined != null) {
445 var mutated = new TypeSpec[spec.InterfacesDefined.Length];
446 for (int ii = 0; ii < mutated.Length; ++ii) {
447 mutated[ii] = mutator.Mutate (spec.InterfacesDefined[ii]);
450 spec.InterfacesDefined = mutated;
453 if (spec.TypeArguments != null) {
454 spec.TypeArguments = mutator.Mutate (spec.TypeArguments);
460 // Update parent cache as we most likely passed the point
461 // where the cache was constructed
463 Parent.CurrentType.MemberCache.AddMember (this.spec);
469 // Initializes all hoisted variables
471 public void EmitStoreyInstantiation (EmitContext ec, ExplicitBlock block)
473 // There can be only one instance variable for each storey type
474 if (Instance != null)
475 throw new InternalErrorException ();
478 // Create an instance of this storey
480 ResolveContext rc = new ResolveContext (ec.MemberContext);
481 rc.CurrentBlock = block;
483 var storey_type_expr = CreateStoreyTypeExpression (ec);
484 var source = new New (storey_type_expr, null, Location).Resolve (rc);
487 // When the current context is async (or iterator) lift local storey
488 // instantiation to the currect storey
490 if (ec.CurrentAnonymousMethod is StateMachineInitializer && (block.HasYield || block.HasAwait)) {
492 // Unfortunately, normal capture mechanism could not be used because we are
493 // too late in the pipeline and standart assign cannot be used either due to
494 // recursive nature of GetStoreyInstanceExpression
496 var field = ec.CurrentAnonymousMethod.Storey.AddCompilerGeneratedField (
497 LocalVariable.GetCompilerGeneratedName (block), storey_type_expr, true);
502 var fexpr = new FieldExpr (field, Location);
503 fexpr.InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location);
504 fexpr.EmitAssign (ec, source, false, false);
507 var local = TemporaryVariableReference.Create (source.Type, block, Location);
508 if (source.Type.IsStruct) {
509 local.LocalInfo.CreateBuilder (ec);
511 local.EmitAssign (ec, source);
517 EmitHoistedFieldsInitialization (rc, ec);
519 // TODO: Implement properly
520 //SymbolWriter.DefineScopeVariable (ID, Instance.Builder);
523 void EmitHoistedFieldsInitialization (ResolveContext rc, EmitContext ec)
526 // Initialize all storey reference fields by using local or hoisted variables
528 if (used_parent_storeys != null) {
529 foreach (StoreyFieldPair sf in used_parent_storeys) {
531 // Get instance expression of storey field
533 Expression instace_expr = GetStoreyInstanceExpression (ec);
534 var fs = sf.Field.Spec;
535 if (TypeManager.IsGenericType (instace_expr.Type))
536 fs = MemberCache.GetMember (instace_expr.Type, fs);
538 FieldExpr f_set_expr = new FieldExpr (fs, Location);
539 f_set_expr.InstanceExpression = instace_expr;
541 // TODO: CompilerAssign expression
542 SimpleAssign a = new SimpleAssign (f_set_expr, sf.Storey.GetStoreyInstanceExpression (ec));
543 if (a.Resolve (rc) != null)
544 a.EmitStatement (ec);
549 // Initialize hoisted `this' only once, everywhere else will be
550 // referenced indirectly
552 if (initialize_hoisted_this) {
553 rc.CurrentBlock.AddScopeStatement (new ThisInitializer (hoisted_this));
557 // Setting currect anonymous method to null blocks any further variable hoisting
559 AnonymousExpression ae = ec.CurrentAnonymousMethod;
560 ec.CurrentAnonymousMethod = null;
562 if (hoisted_params != null) {
563 EmitHoistedParameters (ec, hoisted_params);
566 ec.CurrentAnonymousMethod = ae;
569 protected virtual void EmitHoistedParameters (EmitContext ec, List<HoistedParameter> hoisted)
571 foreach (HoistedParameter hp in hoisted) {
576 // Parameters could be proxied via local fields for value type storey
578 if (hoisted_local_params != null) {
579 var local_param = hoisted_local_params.Find (l => l.Parameter.Parameter == hp.Parameter.Parameter);
580 var source = new FieldExpr (local_param.Field, Location);
581 source.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
582 hp.EmitAssign (ec, source, false, false);
586 hp.EmitHoistingAssignment (ec);
591 // Returns a field which holds referenced storey instance
593 Field GetReferencedStoreyField (AnonymousMethodStorey storey)
595 if (used_parent_storeys == null)
598 foreach (StoreyFieldPair sf in used_parent_storeys) {
599 if (sf.Storey == storey)
607 // Creates storey instance expression regardless of currect IP
609 public Expression GetStoreyInstanceExpression (EmitContext ec)
611 AnonymousExpression am = ec.CurrentAnonymousMethod;
614 // Access from original block -> storey
620 // Access from anonymous method implemented as a static -> storey
622 if (am.Storey == null)
625 Field f = am.Storey.GetReferencedStoreyField (this);
627 if (am.Storey == this) {
629 // Access from inside of same storey (S -> S)
631 return new CompilerGeneratedThis (CurrentType, Location);
635 // External field access
641 // Storey was cached to local field
643 FieldExpr f_ind = new FieldExpr (f, Location);
644 f_ind.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
648 protected virtual string GetVariableMangledName (LocalVariable local_info)
651 // No need to mangle anonymous method hoisted variables cause they
652 // are hoisted in their own scopes
654 return local_info.Name;
657 public HoistedThis HoistedThis {
662 hoisted_this = value;
666 public IList<ExplicitBlock> ReferencesFromChildrenBlock {
667 get { return children_references; }
671 public abstract class HoistedVariable
674 // Hoisted version of variable references used in expression
675 // tree has to be delayed until we know its location. The variable
676 // doesn't know its location until all stories are calculated
678 class ExpressionTreeVariableReference : Expression
680 readonly HoistedVariable hv;
682 public ExpressionTreeVariableReference (HoistedVariable hv)
687 public override bool ContainsEmitWithAwait ()
692 public override Expression CreateExpressionTree (ResolveContext ec)
694 return hv.CreateExpressionTree ();
697 protected override Expression DoResolve (ResolveContext ec)
699 eclass = ExprClass.Value;
700 type = ec.Module.PredefinedTypes.Expression.Resolve ();
704 public override void Emit (EmitContext ec)
706 ResolveContext rc = new ResolveContext (ec.MemberContext);
707 Expression e = hv.GetFieldExpression (ec).CreateExpressionTree (rc, false);
708 // This should never fail
715 protected readonly AnonymousMethodStorey storey;
716 protected Field field;
717 Dictionary<AnonymousExpression, FieldExpr> cached_inner_access; // TODO: Hashtable is too heavyweight
718 FieldExpr cached_outer_access;
720 protected HoistedVariable (AnonymousMethodStorey storey, string name, TypeSpec type)
721 : this (storey, storey.AddCapturedVariable (name, type))
725 protected HoistedVariable (AnonymousMethodStorey storey, Field field)
727 this.storey = storey;
731 public AnonymousMethodStorey Storey {
737 public void AddressOf (EmitContext ec, AddressOp mode)
739 GetFieldExpression (ec).AddressOf (ec, mode);
742 public Expression CreateExpressionTree ()
744 return new ExpressionTreeVariableReference (this);
747 public void Emit (EmitContext ec)
749 GetFieldExpression (ec).Emit (ec);
752 public Expression EmitToField (EmitContext ec)
754 return GetFieldExpression (ec);
758 // Creates field access expression for hoisted variable
760 protected virtual FieldExpr GetFieldExpression (EmitContext ec)
762 if (ec.CurrentAnonymousMethod == null || ec.CurrentAnonymousMethod.Storey == null) {
763 if (cached_outer_access != null)
764 return cached_outer_access;
767 // When setting top-level hoisted variable in generic storey
768 // change storey generic types to method generic types (VAR -> MVAR)
770 if (storey.Instance.Type.IsGenericOrParentIsGeneric) {
771 var fs = MemberCache.GetMember (storey.Instance.Type, field.Spec);
772 cached_outer_access = new FieldExpr (fs, field.Location);
774 cached_outer_access = new FieldExpr (field, field.Location);
777 cached_outer_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
778 return cached_outer_access;
781 FieldExpr inner_access;
782 if (cached_inner_access != null) {
783 if (!cached_inner_access.TryGetValue (ec.CurrentAnonymousMethod, out inner_access))
787 cached_inner_access = new Dictionary<AnonymousExpression, FieldExpr> (4);
790 if (inner_access == null) {
791 if (field.Parent.IsGenericOrParentIsGeneric) {
792 var fs = MemberCache.GetMember (field.Parent.CurrentType, field.Spec);
793 inner_access = new FieldExpr (fs, field.Location);
795 inner_access = new FieldExpr (field, field.Location);
798 inner_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
799 cached_inner_access.Add (ec.CurrentAnonymousMethod, inner_access);
805 public void Emit (EmitContext ec, bool leave_copy)
807 GetFieldExpression (ec).Emit (ec, leave_copy);
810 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
812 GetFieldExpression (ec).EmitAssign (ec, source, leave_copy, false);
816 public class HoistedParameter : HoistedVariable
818 sealed class HoistedFieldAssign : CompilerAssign
820 public HoistedFieldAssign (Expression target, Expression source)
821 : base (target, source, target.Location)
825 protected override Expression ResolveConversions (ResolveContext ec)
828 // Implicit conversion check fails for hoisted type arguments
829 // as they are of different types (!!0 x !0)
835 readonly ParameterReference parameter;
837 public HoistedParameter (AnonymousMethodStorey scope, ParameterReference par)
838 : base (scope, par.Name, par.Type)
840 this.parameter = par;
843 public HoistedParameter (HoistedParameter hp, string name)
844 : base (hp.storey, name, hp.parameter.Type)
846 this.parameter = hp.parameter;
857 public bool IsAssigned { get; set; }
859 public ParameterReference Parameter {
867 public void EmitHoistingAssignment (EmitContext ec)
870 // Remove hoisted redirection to emit assignment from original parameter
872 var temp = parameter.Parameter.HoistedVariant;
873 parameter.Parameter.HoistedVariant = null;
875 var a = new HoistedFieldAssign (GetFieldExpression (ec), parameter);
876 a.EmitStatement (ec);
878 parameter.Parameter.HoistedVariant = temp;
882 class HoistedLocalVariable : HoistedVariable
884 public HoistedLocalVariable (AnonymousMethodStorey storey, LocalVariable local, string name)
885 : base (storey, name, local.Type)
890 public class HoistedThis : HoistedVariable
892 public HoistedThis (AnonymousMethodStorey storey, Field field)
893 : base (storey, field)
905 // Anonymous method expression as created by parser
907 public class AnonymousMethodExpression : Expression
910 // Special conversion for nested expression tree lambdas
912 class Quote : ShimExpression
914 public Quote (Expression expr)
919 public override Expression CreateExpressionTree (ResolveContext ec)
921 var args = new Arguments (1);
922 args.Add (new Argument (expr.CreateExpressionTree (ec)));
923 return CreateExpressionFactoryCall (ec, "Quote", args);
926 protected override Expression DoResolve (ResolveContext rc)
928 expr = expr.Resolve (rc);
932 eclass = expr.eclass;
938 readonly Dictionary<TypeSpec, Expression> compatibles;
940 public ParametersBlock Block;
942 public AnonymousMethodExpression (Location loc)
945 this.compatibles = new Dictionary<TypeSpec, Expression> ();
950 public override string ExprClassName {
952 return "anonymous method";
956 public virtual bool HasExplicitParameters {
958 return Parameters != ParametersCompiled.Undefined;
962 public ParametersCompiled Parameters {
964 return Block.Parameters;
968 public ReportPrinter TypeInferenceReportPrinter {
975 // Returns true if the body of lambda expression can be implicitly
976 // converted to the delegate of type `delegate_type'
978 public bool ImplicitStandardConversionExists (ResolveContext ec, TypeSpec delegate_type)
980 using (ec.With (ResolveContext.Options.InferReturnType, false)) {
981 using (ec.Set (ResolveContext.Options.ProbingMode)) {
982 var prev = ec.Report.SetPrinter (TypeInferenceReportPrinter ?? new NullReportPrinter ());
984 var res = Compatible (ec, delegate_type) != null;
986 ec.Report.SetPrinter (prev);
993 TypeSpec CompatibleChecks (ResolveContext ec, TypeSpec delegate_type)
995 if (delegate_type.IsDelegate)
996 return delegate_type;
998 if (delegate_type.IsExpressionTreeType) {
999 delegate_type = delegate_type.TypeArguments [0];
1000 if (delegate_type.IsDelegate)
1001 return delegate_type;
1003 ec.Report.Error (835, loc, "Cannot convert `{0}' to an expression tree of non-delegate type `{1}'",
1004 GetSignatureForError (), TypeManager.CSharpName (delegate_type));
1008 ec.Report.Error (1660, loc, "Cannot convert `{0}' to non-delegate type `{1}'",
1009 GetSignatureForError (), TypeManager.CSharpName (delegate_type));
1013 protected bool VerifyExplicitParameters (ResolveContext ec, TypeSpec delegate_type, AParametersCollection parameters)
1015 if (VerifyParameterCompatibility (ec, delegate_type, parameters, ec.IsInProbingMode))
1018 if (!ec.IsInProbingMode)
1019 ec.Report.Error (1661, loc,
1020 "Cannot convert `{0}' to delegate type `{1}' since there is a parameter mismatch",
1021 GetSignatureForError (), TypeManager.CSharpName (delegate_type));
1026 protected bool VerifyParameterCompatibility (ResolveContext ec, TypeSpec delegate_type, AParametersCollection invoke_pd, bool ignore_errors)
1028 if (Parameters.Count != invoke_pd.Count) {
1032 ec.Report.Error (1593, loc, "Delegate `{0}' does not take `{1}' arguments",
1033 TypeManager.CSharpName (delegate_type), Parameters.Count.ToString ());
1037 bool has_implicit_parameters = !HasExplicitParameters;
1040 for (int i = 0; i < Parameters.Count; ++i) {
1041 Parameter.Modifier p_mod = invoke_pd.FixedParameters [i].ModFlags;
1042 if (Parameters.FixedParameters [i].ModFlags != p_mod && p_mod != Parameter.Modifier.PARAMS) {
1046 if (p_mod == Parameter.Modifier.NONE)
1047 ec.Report.Error (1677, loc, "Parameter `{0}' should not be declared with the `{1}' keyword",
1048 (i + 1).ToString (), Parameter.GetModifierSignature (Parameters.FixedParameters [i].ModFlags));
1050 ec.Report.Error (1676, loc, "Parameter `{0}' must be declared with the `{1}' keyword",
1051 (i+1).ToString (), Parameter.GetModifierSignature (p_mod));
1055 if (has_implicit_parameters)
1058 TypeSpec type = invoke_pd.Types [i];
1060 // We assume that generic parameters are always inflated
1061 if (TypeManager.IsGenericParameter (type))
1064 if (TypeManager.HasElementType (type) && TypeManager.IsGenericParameter (TypeManager.GetElementType (type)))
1067 if (!TypeSpecComparer.IsEqual (invoke_pd.Types [i], Parameters.Types [i])) {
1071 ec.Report.Error (1678, loc, "Parameter `{0}' is declared as type `{1}' but should be `{2}'",
1073 TypeManager.CSharpName (Parameters.Types [i]),
1074 TypeManager.CSharpName (invoke_pd.Types [i]));
1083 // Infers type arguments based on explicit arguments
1085 public bool ExplicitTypeInference (ResolveContext ec, TypeInferenceContext type_inference, TypeSpec delegate_type)
1087 if (!HasExplicitParameters)
1090 if (!delegate_type.IsDelegate) {
1091 if (!delegate_type.IsExpressionTreeType)
1094 delegate_type = TypeManager.GetTypeArguments (delegate_type) [0];
1095 if (!delegate_type.IsDelegate)
1099 AParametersCollection d_params = Delegate.GetParameters (delegate_type);
1100 if (d_params.Count != Parameters.Count)
1103 var ptypes = Parameters.Types;
1104 var dtypes = d_params.Types;
1105 for (int i = 0; i < Parameters.Count; ++i) {
1106 if (type_inference.ExactInference (ptypes[i], dtypes[i]) == 0) {
1108 // Continue when 0 (quick path) does not mean inference failure. Checking for
1109 // same type handles cases like int -> int
1111 if (ptypes[i] == dtypes[i])
1121 public TypeSpec InferReturnType (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type)
1124 AnonymousExpression am;
1126 if (compatibles.TryGetValue (delegate_type, out expr)) {
1127 am = expr as AnonymousExpression;
1128 return am == null ? null : am.ReturnType;
1131 using (ec.Set (ResolveContext.Options.ProbingMode | ResolveContext.Options.InferReturnType)) {
1133 if (TypeInferenceReportPrinter != null) {
1134 prev = ec.Report.SetPrinter (TypeInferenceReportPrinter);
1139 var body = CompatibleMethodBody (ec, tic, null, delegate_type);
1141 am = body.Compatible (ec, body);
1146 if (TypeInferenceReportPrinter != null) {
1147 ec.Report.SetPrinter (prev);
1154 // compatibles.Add (delegate_type, am);
1155 return am.ReturnType;
1158 public override bool ContainsEmitWithAwait ()
1164 // Returns AnonymousMethod container if this anonymous method
1165 // expression can be implicitly converted to the delegate type `delegate_type'
1167 public Expression Compatible (ResolveContext ec, TypeSpec type)
1170 if (compatibles.TryGetValue (type, out am))
1173 TypeSpec delegate_type = CompatibleChecks (ec, type);
1174 if (delegate_type == null)
1178 // At this point its the first time we know the return type that is
1179 // needed for the anonymous method. We create the method here.
1182 var invoke_mb = Delegate.GetInvokeMethod (delegate_type);
1183 TypeSpec return_type = invoke_mb.ReturnType;
1186 // Second: the return type of the delegate must be compatible with
1187 // the anonymous type. Instead of doing a pass to examine the block
1188 // we satisfy the rule by setting the return type on the EmitContext
1189 // to be the delegate type return type.
1192 var body = CompatibleMethodBody (ec, null, return_type, delegate_type);
1196 bool etree_conversion = delegate_type != type;
1199 if (etree_conversion) {
1200 if (ec.HasSet (ResolveContext.Options.ExpressionTreeConversion)) {
1202 // Nested expression tree lambda use same scope as parent
1203 // lambda, this also means no variable capturing between this
1206 am = body.Compatible (ec, ec.CurrentAnonymousMethod);
1209 // Quote nested expression tree
1212 am = new Quote (am);
1214 int errors = ec.Report.Errors;
1216 if (Block.IsAsync) {
1217 ec.Report.Error (1989, loc, "Async lambda expressions cannot be converted to expression trees");
1220 using (ec.Set (ResolveContext.Options.ExpressionTreeConversion)) {
1221 am = body.Compatible (ec);
1225 // Rewrite expressions into expression tree when targeting Expression<T>
1227 if (am != null && errors == ec.Report.Errors)
1228 am = CreateExpressionTree (ec, delegate_type);
1231 am = body.Compatible (ec);
1233 if (body.DirectMethodGroupConversion != null) {
1234 var errors_printer = new SessionReportPrinter ();
1235 var old = ec.Report.SetPrinter (errors_printer);
1236 var expr = new ImplicitDelegateCreation (delegate_type, body.DirectMethodGroupConversion, loc) {
1237 AllowSpecialMethodsInvocation = true
1239 ec.Report.SetPrinter (old);
1240 if (expr != null && errors_printer.ErrorsCount == 0)
1244 } catch (CompletionResult) {
1246 } catch (FatalException) {
1248 } catch (Exception e) {
1249 throw new InternalErrorException (e, loc);
1252 if (!ec.IsInProbingMode) {
1253 compatibles.Add (type, am ?? EmptyExpression.Null);
1259 protected virtual Expression CreateExpressionTree (ResolveContext ec, TypeSpec delegate_type)
1261 return CreateExpressionTree (ec);
1264 public override Expression CreateExpressionTree (ResolveContext ec)
1266 ec.Report.Error (1946, loc, "An anonymous method cannot be converted to an expression tree");
1270 protected virtual ParametersCompiled ResolveParameters (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type)
1272 var delegate_parameters = Delegate.GetParameters (delegate_type);
1274 if (Parameters == ParametersCompiled.Undefined) {
1276 // We provide a set of inaccessible parameters
1278 Parameter[] fixedpars = new Parameter[delegate_parameters.Count];
1280 for (int i = 0; i < delegate_parameters.Count; i++) {
1281 Parameter.Modifier i_mod = delegate_parameters.FixedParameters [i].ModFlags;
1282 if ((i_mod & Parameter.Modifier.OUT) != 0) {
1283 if (!ec.IsInProbingMode) {
1284 ec.Report.Error (1688, loc,
1285 "Cannot convert anonymous method block without a parameter list to delegate type `{0}' because it has one or more `out' parameters",
1286 delegate_type.GetSignatureForError ());
1291 fixedpars[i] = new Parameter (
1292 new TypeExpression (delegate_parameters.Types [i], loc), null,
1293 delegate_parameters.FixedParameters [i].ModFlags, null, loc);
1296 return ParametersCompiled.CreateFullyResolved (fixedpars, delegate_parameters.Types);
1299 if (!VerifyExplicitParameters (ec, delegate_type, delegate_parameters)) {
1306 protected override Expression DoResolve (ResolveContext ec)
1308 if (ec.HasSet (ResolveContext.Options.ConstantScope)) {
1309 ec.Report.Error (1706, loc, "Anonymous methods and lambda expressions cannot be used in the current context");
1314 // Set class type, set type
1317 eclass = ExprClass.Value;
1320 // This hack means `The type is not accessible
1321 // anywhere', we depend on special conversion
1324 type = InternalType.AnonymousMethod;
1326 if (!DoResolveParameters (ec))
1330 // FIXME: The emitted code isn't very careful about reachability
1331 // so, ensure we have a 'ret' at the end
1332 BlockContext bc = ec as BlockContext;
1333 if (bc != null && bc.CurrentBranching != null && bc.CurrentBranching.CurrentUsageVector.IsUnreachable)
1334 bc.NeedReturnLabel ();
1339 protected virtual bool DoResolveParameters (ResolveContext rc)
1341 return Parameters.Resolve (rc);
1344 public override void Emit (EmitContext ec)
1346 // nothing, as we only exist to not do anything.
1349 public static void Error_AddressOfCapturedVar (ResolveContext ec, IVariableReference var, Location loc)
1351 ec.Report.Error (1686, loc,
1352 "Local variable or parameter `{0}' cannot have their address taken and be used inside an anonymous method, lambda expression or query expression",
1356 public override string GetSignatureForError ()
1358 return ExprClassName;
1361 AnonymousMethodBody CompatibleMethodBody (ResolveContext ec, TypeInferenceContext tic, TypeSpec return_type, TypeSpec delegate_type)
1363 ParametersCompiled p = ResolveParameters (ec, tic, delegate_type);
1367 ParametersBlock b = ec.IsInProbingMode ? (ParametersBlock) Block.PerformClone () : Block;
1370 var rt = return_type;
1371 if (rt != null && rt.Kind != MemberKind.Void && rt != ec.Module.PredefinedTypes.Task.TypeSpec && !rt.IsGenericTask) {
1372 ec.Report.Error (4010, loc, "Cannot convert async {0} to delegate type `{1}'",
1373 GetSignatureForError (), delegate_type.GetSignatureForError ());
1378 b = b.ConvertToAsyncTask (ec, ec.CurrentMemberDefinition.Parent.PartialContainer, p, return_type, loc);
1381 return CompatibleMethodFactory (return_type ?? InternalType.ErrorType, delegate_type, p, b);
1384 protected virtual AnonymousMethodBody CompatibleMethodFactory (TypeSpec return_type, TypeSpec delegate_type, ParametersCompiled p, ParametersBlock b)
1386 return new AnonymousMethodBody (p, b, return_type, delegate_type, loc);
1389 protected override void CloneTo (CloneContext clonectx, Expression t)
1391 AnonymousMethodExpression target = (AnonymousMethodExpression) t;
1393 target.Block = (ParametersBlock) clonectx.LookupBlock (Block);
1396 public override object Accept (StructuralVisitor visitor)
1398 return visitor.Visit (this);
1403 // Abstract expression for any block which requires variables hoisting
1405 public abstract class AnonymousExpression : ExpressionStatement
1407 protected class AnonymousMethodMethod : Method
1409 public readonly AnonymousExpression AnonymousMethod;
1410 public readonly AnonymousMethodStorey Storey;
1412 public AnonymousMethodMethod (TypeDefinition parent, AnonymousExpression am, AnonymousMethodStorey storey,
1413 TypeExpr return_type,
1414 Modifiers mod, MemberName name,
1415 ParametersCompiled parameters)
1416 : base (parent, return_type, mod | Modifiers.COMPILER_GENERATED,
1417 name, parameters, null)
1419 this.AnonymousMethod = am;
1420 this.Storey = storey;
1422 Parent.PartialContainer.Members.Add (this);
1423 Block = new ToplevelBlock (am.block, parameters);
1426 public override EmitContext CreateEmitContext (ILGenerator ig, SourceMethodBuilder sourceMethod)
1428 EmitContext ec = new EmitContext (this, ig, ReturnType, sourceMethod);
1429 ec.CurrentAnonymousMethod = AnonymousMethod;
1433 protected override void DefineTypeParameters ()
1435 // Type parameters were cloned
1438 protected override bool ResolveMemberType ()
1440 if (!base.ResolveMemberType ())
1443 if (Storey != null && Storey.Mutator != null) {
1444 if (!parameters.IsEmpty) {
1445 var mutated = Storey.Mutator.Mutate (parameters.Types);
1446 if (mutated != parameters.Types)
1447 parameters = ParametersCompiled.CreateFullyResolved ((Parameter[]) parameters.FixedParameters, mutated);
1450 member_type = Storey.Mutator.Mutate (member_type);
1456 public override void Emit ()
1458 if (MethodBuilder == null) {
1466 protected readonly ParametersBlock block;
1468 public TypeSpec ReturnType;
1470 protected AnonymousExpression (ParametersBlock block, TypeSpec return_type, Location loc)
1472 this.ReturnType = return_type;
1477 public abstract string ContainerType { get; }
1478 public abstract bool IsIterator { get; }
1479 public abstract AnonymousMethodStorey Storey { get; }
1482 // The block that makes up the body for the anonymous method
1484 public ParametersBlock Block {
1490 public AnonymousExpression Compatible (ResolveContext ec)
1492 return Compatible (ec, this);
1495 public AnonymousExpression Compatible (ResolveContext ec, AnonymousExpression ae)
1500 // TODO: Implement clone
1501 BlockContext aec = new BlockContext (ec, block, ReturnType);
1502 aec.CurrentAnonymousMethod = ae;
1504 var am = this as AnonymousMethodBody;
1506 if (ec.HasSet (ResolveContext.Options.InferReturnType) && am != null) {
1507 am.ReturnTypeInference = new TypeInferenceContext ();
1510 var bc = ec as BlockContext;
1512 aec.FlowOffset = bc.FlowOffset;
1514 var errors = ec.Report.Errors;
1516 bool res = Block.Resolve (ec.CurrentBranching, aec, null);
1518 if (am != null && am.ReturnTypeInference != null) {
1519 am.ReturnTypeInference.FixAllTypes (ec);
1520 ReturnType = am.ReturnTypeInference.InferredTypeArguments [0];
1521 am.ReturnTypeInference = null;
1524 // If e is synchronous the inferred return type is T
1525 // If e is asynchronous the inferred return type is Task<T>
1527 if (block.IsAsync && ReturnType != null) {
1528 ReturnType = ec.Module.PredefinedTypes.TaskGeneric.TypeSpec.MakeGenericType (ec, new [] { ReturnType });
1532 if (res && errors != ec.Report.Errors)
1535 return res ? this : null;
1538 public override bool ContainsEmitWithAwait ()
1543 public void SetHasThisAccess ()
1545 ExplicitBlock b = block;
1547 if (b.HasCapturedThis)
1550 b.HasCapturedThis = true;
1551 b = b.Parent == null ? null : b.Parent.Explicit;
1552 } while (b != null);
1556 public class AnonymousMethodBody : AnonymousExpression
1558 protected readonly ParametersCompiled parameters;
1559 AnonymousMethodStorey storey;
1561 AnonymousMethodMethod method;
1564 TypeInferenceContext return_inference;
1566 public AnonymousMethodBody (ParametersCompiled parameters,
1567 ParametersBlock block, TypeSpec return_type, TypeSpec delegate_type,
1569 : base (block, return_type, loc)
1571 this.type = delegate_type;
1572 this.parameters = parameters;
1577 public override string ContainerType {
1578 get { return "anonymous method"; }
1582 // Method-group instance for lambdas which can be replaced with
1583 // simple method group call
1585 public MethodGroupExpr DirectMethodGroupConversion {
1589 public override bool IsIterator {
1595 public ParametersCompiled Parameters {
1601 public TypeInferenceContext ReturnTypeInference {
1603 return return_inference;
1606 return_inference = value;
1610 public override AnonymousMethodStorey Storey {
1618 public override Expression CreateExpressionTree (ResolveContext ec)
1620 ec.Report.Error (1945, loc, "An expression tree cannot contain an anonymous method expression");
1624 bool Define (ResolveContext ec)
1626 if (!Block.Resolved && Compatible (ec) == null)
1629 if (block_name == null) {
1630 MemberCore mc = (MemberCore) ec.MemberContext;
1631 block_name = mc.MemberName.Basename;
1638 // Creates a host for the anonymous method
1640 AnonymousMethodMethod DoCreateMethodHost (EmitContext ec)
1643 // Anonymous method body can be converted to
1645 // 1, an instance method in current scope when only `this' is hoisted
1646 // 2, a static method in current scope when neither `this' nor any variable is hoisted
1647 // 3, an instance method in compiler generated storey when any hoisted variable exists
1650 Modifiers modifiers;
1651 TypeDefinition parent = null;
1653 var src_block = Block.Original.Explicit;
1654 if (src_block.HasCapturedVariable || src_block.HasCapturedThis) {
1655 parent = storey = FindBestMethodStorey ();
1657 if (storey == null) {
1658 var top_block = src_block.ParametersBlock.TopBlock;
1659 var sm = top_block.StateMachine;
1661 if (src_block.HasCapturedThis) {
1663 // Remove hoisted 'this' request when simple instance method is
1664 // enough (no hoisted variables only 'this')
1666 if (src_block.ParametersBlock.StateMachine == null)
1667 top_block.RemoveThisReferenceFromChildrenBlock (src_block);
1670 // Special case where parent class is used to emit instance method
1671 // because currect storey is of value type (async host). We cannot
1672 // use ldftn on non-boxed instances either to share mutated state
1674 if (sm != null && sm.Kind == MemberKind.Struct) {
1675 parent = sm.Parent.PartialContainer;
1680 // For iterators we can host everything in one class
1682 if (sm is IteratorStorey)
1683 parent = storey = sm;
1686 modifiers = storey != null ? Modifiers.INTERNAL : Modifiers.PRIVATE;
1688 if (ec.CurrentAnonymousMethod != null)
1689 parent = storey = ec.CurrentAnonymousMethod.Storey;
1691 modifiers = Modifiers.STATIC | Modifiers.PRIVATE;
1695 parent = ec.CurrentTypeDefinition.Parent.PartialContainer;
1697 string name = CompilerGeneratedContainer.MakeName (parent != storey ? block_name : null,
1698 "m", null, ec.Module.CounterAnonymousMethods++);
1700 MemberName member_name;
1701 if (storey == null && ec.CurrentTypeParameters != null) {
1703 var hoisted_tparams = ec.CurrentTypeParameters;
1704 var type_params = new TypeParameters (hoisted_tparams.Count);
1705 for (int i = 0; i < hoisted_tparams.Count; ++i) {
1706 type_params.Add (hoisted_tparams[i].CreateHoistedCopy (null));
1709 member_name = new MemberName (name, type_params, Location);
1711 member_name = new MemberName (name, Location);
1714 return new AnonymousMethodMethod (parent,
1715 this, storey, new TypeExpression (ReturnType, Location), modifiers,
1716 member_name, parameters);
1719 protected override Expression DoResolve (ResolveContext ec)
1724 eclass = ExprClass.Value;
1728 public override void Emit (EmitContext ec)
1731 // Use same anonymous method implementation for scenarios where same
1732 // code is used from multiple blocks, e.g. field initializers
1734 if (method == null) {
1736 // Delay an anonymous method definition to avoid emitting unused code
1737 // for unreachable blocks or expression trees
1739 method = DoCreateMethodHost (ec);
1743 bool is_static = (method.ModFlags & Modifiers.STATIC) != 0;
1744 if (is_static && am_cache == null) {
1746 // Creates a field cache to store delegate instance if it's not generic
1748 if (!method.MemberName.IsGeneric) {
1749 var parent = method.Parent.PartialContainer;
1750 int id = parent.AnonymousMethodsCounter++;
1751 var cache_type = storey != null && storey.Mutator != null ? storey.Mutator.Mutate (type) : type;
1753 am_cache = new Field (parent, new TypeExpression (cache_type, loc),
1754 Modifiers.STATIC | Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED,
1755 new MemberName (CompilerGeneratedContainer.MakeName (null, "f", "am$cache", id), loc), null);
1757 parent.AddField (am_cache);
1759 // TODO: Implement caching of generated generic static methods
1763 // Some extra class is needed to capture variable generic type
1764 // arguments. Maybe we could re-use anonymous types, with a unique
1765 // anonymous method id, but they are quite heavy.
1767 // Consider : "() => typeof(T);"
1769 // We need something like
1770 // static class Wrap<Tn, Tm, DelegateType> {
1771 // public static DelegateType cache;
1774 // We then specialize local variable to capture all generic parameters
1775 // and delegate type, e.g. "Wrap<Ta, Tb, DelegateTypeInst> cache;"
1780 Label l_initialized = ec.DefineLabel ();
1782 if (am_cache != null) {
1783 ec.Emit (OpCodes.Ldsfld, am_cache.Spec);
1784 ec.Emit (OpCodes.Brtrue_S, l_initialized);
1788 // Load method delegate implementation
1793 } else if (storey != null) {
1794 Expression e = storey.GetStoreyInstanceExpression (ec).Resolve (new ResolveContext (ec.MemberContext));
1802 // Special case for value type storey where this is not lifted but
1803 // droped off to parent class
1805 for (var b = Block.Parent; b != null; b = b.Parent) {
1806 if (b.ParametersBlock.StateMachine != null) {
1807 ec.Emit (OpCodes.Ldfld, b.ParametersBlock.StateMachine.HoistedThis.Field.Spec);
1813 var delegate_method = method.Spec;
1814 if (storey != null && storey.MemberName.IsGeneric) {
1815 TypeSpec t = storey.Instance.Type;
1818 // Mutate anonymous method instance type if we are in nested
1819 // hoisted generic anonymous method storey
1821 if (ec.IsAnonymousStoreyMutateRequired) {
1822 t = storey.Mutator.Mutate (t);
1825 ec.Emit (OpCodes.Ldftn, TypeBuilder.GetMethod (t.GetMetaInfo (), (MethodInfo) delegate_method.GetMetaInfo ()));
1827 if (delegate_method.IsGeneric)
1828 delegate_method = delegate_method.MakeGenericMethod (ec.MemberContext, method.TypeParameters);
1830 ec.Emit (OpCodes.Ldftn, delegate_method);
1833 var constructor_method = Delegate.GetConstructor (type);
1834 ec.Emit (OpCodes.Newobj, constructor_method);
1836 if (am_cache != null) {
1837 ec.Emit (OpCodes.Stsfld, am_cache.Spec);
1838 ec.MarkLabel (l_initialized);
1839 ec.Emit (OpCodes.Ldsfld, am_cache.Spec);
1843 public override void EmitStatement (EmitContext ec)
1845 throw new NotImplementedException ();
1849 // Look for the best storey for this anonymous method
1851 AnonymousMethodStorey FindBestMethodStorey ()
1854 // Use the nearest parent block which has a storey
1856 for (Block b = Block.Parent; b != null; b = b.Parent) {
1857 AnonymousMethodStorey s = b.Explicit.AnonymousMethodStorey;
1865 public override string GetSignatureForError ()
1867 return TypeManager.CSharpName (type);
1872 // Anonymous type container
1874 public class AnonymousTypeClass : CompilerGeneratedContainer
1876 public const string ClassNamePrefix = "<>__AnonType";
1877 public const string SignatureForError = "anonymous type";
1879 readonly IList<AnonymousTypeParameter> parameters;
1881 private AnonymousTypeClass (ModuleContainer parent, MemberName name, IList<AnonymousTypeParameter> parameters, Location loc)
1882 : base (parent, name, parent.Evaluator != null ? Modifiers.PUBLIC : Modifiers.INTERNAL)
1884 this.parameters = parameters;
1887 public static AnonymousTypeClass Create (TypeContainer parent, IList<AnonymousTypeParameter> parameters, Location loc)
1889 string name = ClassNamePrefix + parent.Module.CounterAnonymousTypes++;
1891 ParametersCompiled all_parameters;
1892 TypeParameters tparams = null;
1893 SimpleName[] t_args;
1895 if (parameters.Count == 0) {
1896 all_parameters = ParametersCompiled.EmptyReadOnlyParameters;
1899 t_args = new SimpleName[parameters.Count];
1900 tparams = new TypeParameters ();
1901 Parameter[] ctor_params = new Parameter[parameters.Count];
1902 for (int i = 0; i < parameters.Count; ++i) {
1903 AnonymousTypeParameter p = parameters[i];
1904 for (int ii = 0; ii < i; ++ii) {
1905 if (parameters[ii].Name == p.Name) {
1906 parent.Compiler.Report.Error (833, parameters[ii].Location,
1907 "`{0}': An anonymous type cannot have multiple properties with the same name",
1910 p = new AnonymousTypeParameter (null, "$" + i.ToString (), p.Location);
1916 t_args[i] = new SimpleName ("<" + p.Name + ">__T", p.Location);
1917 tparams.Add (new TypeParameter (i, new MemberName (t_args[i].Name, p.Location), null, null, Variance.None));
1918 ctor_params[i] = new Parameter (t_args[i], p.Name, Parameter.Modifier.NONE, null, p.Location);
1921 all_parameters = new ParametersCompiled (ctor_params);
1925 // Create generic anonymous type host with generic arguments
1926 // named upon properties names
1928 AnonymousTypeClass a_type = new AnonymousTypeClass (parent.Module, new MemberName (name, tparams, loc), parameters, loc);
1930 Constructor c = new Constructor (a_type, name, Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN,
1931 null, all_parameters, loc);
1932 c.Block = new ToplevelBlock (parent.Module.Compiler, c.ParameterInfo, loc);
1935 // Create fields and constructor body with field initialization
1938 for (int i = 0; i < parameters.Count; ++i) {
1939 AnonymousTypeParameter p = parameters [i];
1941 Field f = new Field (a_type, t_args [i], Modifiers.PRIVATE | Modifiers.READONLY | Modifiers.DEBUGGER_HIDDEN,
1942 new MemberName ("<" + p.Name + ">", p.Location), null);
1944 if (!a_type.AddField (f)) {
1949 c.Block.AddStatement (new StatementExpression (
1950 new SimpleAssign (new MemberAccess (new This (p.Location), f.Name),
1951 c.Block.GetParameterReference (i, p.Location))));
1953 ToplevelBlock get_block = new ToplevelBlock (parent.Module.Compiler, p.Location);
1954 get_block.AddStatement (new Return (
1955 new MemberAccess (new This (p.Location), f.Name), p.Location));
1957 Property prop = new Property (a_type, t_args [i], Modifiers.PUBLIC,
1958 new MemberName (p.Name, p.Location), null);
1959 prop.Get = new Property.GetMethod (prop, 0, null, p.Location);
1960 prop.Get.Block = get_block;
1961 a_type.AddMember (prop);
1967 a_type.AddConstructor (c);
1971 protected override bool DoDefineMembers ()
1973 if (!base.DoDefineMembers ())
1976 Location loc = Location;
1978 var equals_parameters = ParametersCompiled.CreateFullyResolved (
1979 new Parameter (new TypeExpression (Compiler.BuiltinTypes.Object, loc), "obj", 0, null, loc), Compiler.BuiltinTypes.Object);
1981 Method equals = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Bool, loc),
1982 Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("Equals", loc),
1983 equals_parameters, null);
1985 equals_parameters[0].Resolve (equals, 0);
1987 Method tostring = new Method (this, new TypeExpression (Compiler.BuiltinTypes.String, loc),
1988 Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("ToString", loc),
1989 Mono.CSharp.ParametersCompiled.EmptyReadOnlyParameters, null);
1991 ToplevelBlock equals_block = new ToplevelBlock (Compiler, equals.ParameterInfo, loc);
1993 TypeExpr current_type;
1994 if (CurrentTypeParameters != null) {
1995 var targs = new TypeArguments ();
1996 for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
1997 targs.Add (new TypeParameterExpr (CurrentTypeParameters[i], Location));
2000 current_type = new GenericTypeExpr (Definition, targs, loc);
2002 current_type = new TypeExpression (Definition, loc);
2005 var li_other = LocalVariable.CreateCompilerGenerated (CurrentType, equals_block, loc);
2006 equals_block.AddStatement (new BlockVariableDeclaration (new TypeExpression (li_other.Type, loc), li_other));
2007 var other_variable = new LocalVariableReference (li_other, loc);
2009 MemberAccess system_collections_generic = new MemberAccess (new MemberAccess (
2010 new QualifiedAliasMember ("global", "System", loc), "Collections", loc), "Generic", loc);
2012 Expression rs_equals = null;
2013 Expression string_concat = new StringConstant (Compiler.BuiltinTypes, "{", loc);
2014 Expression rs_hashcode = new IntConstant (Compiler.BuiltinTypes, -2128831035, loc);
2015 for (int i = 0; i < parameters.Count; ++i) {
2016 var p = parameters [i];
2017 var f = (Field) Members [i * 2];
2019 MemberAccess equality_comparer = new MemberAccess (new MemberAccess (
2020 system_collections_generic, "EqualityComparer",
2021 new TypeArguments (new SimpleName (CurrentTypeParameters [i].Name, loc)), loc),
2024 Arguments arguments_equal = new Arguments (2);
2025 arguments_equal.Add (new Argument (new MemberAccess (new This (f.Location), f.Name)));
2026 arguments_equal.Add (new Argument (new MemberAccess (other_variable, f.Name)));
2028 Expression field_equal = new Invocation (new MemberAccess (equality_comparer,
2029 "Equals", loc), arguments_equal);
2031 Arguments arguments_hashcode = new Arguments (1);
2032 arguments_hashcode.Add (new Argument (new MemberAccess (new This (f.Location), f.Name)));
2033 Expression field_hashcode = new Invocation (new MemberAccess (equality_comparer,
2034 "GetHashCode", loc), arguments_hashcode);
2036 IntConstant FNV_prime = new IntConstant (Compiler.BuiltinTypes, 16777619, loc);
2037 rs_hashcode = new Binary (Binary.Operator.Multiply,
2038 new Binary (Binary.Operator.ExclusiveOr, rs_hashcode, field_hashcode),
2041 Expression field_to_string = new Conditional (new BooleanExpression (new Binary (Binary.Operator.Inequality,
2042 new MemberAccess (new This (f.Location), f.Name), new NullLiteral (loc))),
2043 new Invocation (new MemberAccess (
2044 new MemberAccess (new This (f.Location), f.Name), "ToString"), null),
2045 new StringConstant (Compiler.BuiltinTypes, string.Empty, loc), loc);
2047 if (rs_equals == null) {
2048 rs_equals = field_equal;
2049 string_concat = new Binary (Binary.Operator.Addition,
2051 new Binary (Binary.Operator.Addition,
2052 new StringConstant (Compiler.BuiltinTypes, " " + p.Name + " = ", loc),
2058 // Implementation of ToString () body using string concatenation
2060 string_concat = new Binary (Binary.Operator.Addition,
2061 new Binary (Binary.Operator.Addition,
2063 new StringConstant (Compiler.BuiltinTypes, ", " + p.Name + " = ", loc)),
2066 rs_equals = new Binary (Binary.Operator.LogicalAnd, rs_equals, field_equal);
2069 string_concat = new Binary (Binary.Operator.Addition,
2071 new StringConstant (Compiler.BuiltinTypes, " }", loc));
2074 // Equals (object obj) override
2076 var other_variable_assign = new TemporaryVariableReference (li_other, loc);
2077 equals_block.AddStatement (new StatementExpression (
2078 new SimpleAssign (other_variable_assign,
2079 new As (equals_block.GetParameterReference (0, loc),
2080 current_type, loc), loc)));
2082 Expression equals_test = new Binary (Binary.Operator.Inequality, other_variable, new NullLiteral (loc));
2083 if (rs_equals != null)
2084 equals_test = new Binary (Binary.Operator.LogicalAnd, equals_test, rs_equals);
2085 equals_block.AddStatement (new Return (equals_test, loc));
2087 equals.Block = equals_block;
2089 Members.Add (equals);
2092 // GetHashCode () override
2094 Method hashcode = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Int, loc),
2095 Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN,
2096 new MemberName ("GetHashCode", loc),
2097 Mono.CSharp.ParametersCompiled.EmptyReadOnlyParameters, null);
2100 // Modified FNV with good avalanche behavior and uniform
2101 // distribution with larger hash sizes.
2103 // const int FNV_prime = 16777619;
2104 // int hash = (int) 2166136261;
2105 // foreach (int d in data)
2106 // hash = (hash ^ d) * FNV_prime;
2107 // hash += hash << 13;
2108 // hash ^= hash >> 7;
2109 // hash += hash << 3;
2110 // hash ^= hash >> 17;
2111 // hash += hash << 5;
2113 ToplevelBlock hashcode_top = new ToplevelBlock (Compiler, loc);
2114 Block hashcode_block = new Block (hashcode_top, loc, loc);
2115 hashcode_top.AddStatement (new Unchecked (hashcode_block, loc));
2117 var li_hash = LocalVariable.CreateCompilerGenerated (Compiler.BuiltinTypes.Int, hashcode_top, loc);
2118 hashcode_block.AddStatement (new BlockVariableDeclaration (new TypeExpression (li_hash.Type, loc), li_hash));
2119 LocalVariableReference hash_variable_assign = new LocalVariableReference (li_hash, loc);
2120 hashcode_block.AddStatement (new StatementExpression (
2121 new SimpleAssign (hash_variable_assign, rs_hashcode)));
2123 var hash_variable = new LocalVariableReference (li_hash, loc);
2124 hashcode_block.AddStatement (new StatementExpression (
2125 new CompoundAssign (Binary.Operator.Addition, hash_variable,
2126 new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 13, loc)))));
2127 hashcode_block.AddStatement (new StatementExpression (
2128 new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
2129 new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 7, loc)))));
2130 hashcode_block.AddStatement (new StatementExpression (
2131 new CompoundAssign (Binary.Operator.Addition, hash_variable,
2132 new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 3, loc)))));
2133 hashcode_block.AddStatement (new StatementExpression (
2134 new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
2135 new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 17, loc)))));
2136 hashcode_block.AddStatement (new StatementExpression (
2137 new CompoundAssign (Binary.Operator.Addition, hash_variable,
2138 new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 5, loc)))));
2140 hashcode_block.AddStatement (new Return (hash_variable, loc));
2141 hashcode.Block = hashcode_top;
2143 Members.Add (hashcode);
2146 // ToString () override
2149 ToplevelBlock tostring_block = new ToplevelBlock (Compiler, loc);
2150 tostring_block.AddStatement (new Return (string_concat, loc));
2151 tostring.Block = tostring_block;
2153 Members.Add (tostring);
2158 public override string GetSignatureForError ()
2160 return SignatureForError;
2163 public override CompilationSourceFile GetCompilationSourceFile ()
2168 public IList<AnonymousTypeParameter> Parameters {