/NRefactory/ICSharpCode.NRefactory.CSharp/Parser/mcs/anonymous.cs
C# | 2292 lines | 1547 code | 408 blank | 337 comment | 384 complexity | 78a3ad6fc1ff25d143b9274abfc8b331 MD5 | raw file
Possible License(s): LGPL-2.1, MIT, CC-BY-SA-3.0
- //
- // anonymous.cs: Support for anonymous methods and types
- //
- // Author:
- // Miguel de Icaza (miguel@ximain.com)
- // Marek Safar (marek.safar@gmail.com)
- //
- // Dual licensed under the terms of the MIT X11 or GNU GPL
- // Copyright 2003-2011 Novell, Inc.
- // Copyright 2011 Xamarin Inc
- //
- using System;
- using System.Collections.Generic;
- using Mono.CompilerServices.SymbolWriter;
- using System.Diagnostics;
- #if STATIC
- using IKVM.Reflection;
- using IKVM.Reflection.Emit;
- using System.Diagnostics;
- #else
- using System.Reflection;
- using System.Reflection.Emit;
- #endif
- namespace Mono.CSharp {
- public abstract class CompilerGeneratedContainer : ClassOrStruct
- {
- protected CompilerGeneratedContainer (TypeContainer parent, MemberName name, Modifiers mod)
- : this (parent, name, mod, MemberKind.Class)
- {
- }
- protected CompilerGeneratedContainer (TypeContainer parent, MemberName name, Modifiers mod, MemberKind kind)
- : base (parent, name, null, kind)
- {
- Debug.Assert ((mod & Modifiers.AccessibilityMask) != 0);
- ModFlags = mod | Modifiers.COMPILER_GENERATED | Modifiers.SEALED;
- spec = new TypeSpec (Kind, null, this, null, ModFlags);
- }
- protected void CheckMembersDefined ()
- {
- if (HasMembersDefined)
- throw new InternalErrorException ("Helper class already defined!");
- }
- protected override bool DoDefineMembers ()
- {
- if (Kind == MemberKind.Class && !IsStatic && !PartialContainer.HasInstanceConstructor) {
- DefineDefaultConstructor (false);
- }
- return base.DoDefineMembers ();
- }
- protected static MemberName MakeMemberName (MemberBase host, string name, int unique_id, TypeParameters tparams, Location loc)
- {
- string host_name = host == null ? null : host is InterfaceMemberBase ? ((InterfaceMemberBase)host).GetFullName (host.MemberName) : host.MemberName.Name;
- string tname = MakeName (host_name, "c", name, unique_id);
- TypeParameters args = null;
- if (tparams != null) {
- args = new TypeParameters (tparams.Count);
- // Type parameters will be filled later when we have TypeContainer
- // instance, for now we need only correct arity to create valid name
- for (int i = 0; i < tparams.Count; ++i)
- args.Add ((TypeParameter) null);
- }
- return new MemberName (tname, args, loc);
- }
- public static string MakeName (string host, string typePrefix, string name, int id)
- {
- return "<" + host + ">" + typePrefix + "__" + name + id.ToString ("X");
- }
- protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
- {
- base_type = Compiler.BuiltinTypes.Object;
- base_class = null;
- return null;
- }
- }
- public class HoistedStoreyClass : CompilerGeneratedContainer
- {
- public sealed class HoistedField : Field
- {
- public HoistedField (HoistedStoreyClass parent, FullNamedExpression type, Modifiers mod, string name,
- Attributes attrs, Location loc)
- : base (parent, type, mod, new MemberName (name, loc), attrs)
- {
- }
- protected override bool ResolveMemberType ()
- {
- if (!base.ResolveMemberType ())
- return false;
- HoistedStoreyClass parent = ((HoistedStoreyClass) Parent).GetGenericStorey ();
- if (parent != null && parent.Mutator != null)
- member_type = parent.Mutator.Mutate (MemberType);
- return true;
- }
- }
- protected TypeParameterMutator mutator;
- public HoistedStoreyClass (TypeDefinition parent, MemberName name, TypeParameters tparams, Modifiers mods, MemberKind kind)
- : base (parent, name, mods | Modifiers.PRIVATE, kind)
- {
- if (tparams != null) {
- var type_params = name.TypeParameters;
- var src = new TypeParameterSpec[tparams.Count];
- var dst = new TypeParameterSpec[tparams.Count];
- for (int i = 0; i < tparams.Count; ++i) {
- type_params[i] = tparams[i].CreateHoistedCopy (spec);
- src[i] = tparams[i].Type;
- dst[i] = type_params[i].Type;
- }
- // A copy is not enough, inflate any type parameter constraints
- // using a new type parameters
- var inflator = new TypeParameterInflator (this, null, src, dst);
- for (int i = 0; i < tparams.Count; ++i) {
- src[i].InflateConstraints (inflator, dst[i]);
- }
- mutator = new TypeParameterMutator (tparams, type_params);
- }
- }
- #region Properties
- public TypeParameterMutator Mutator {
- get {
- return mutator;
- }
- set {
- mutator = value;
- }
- }
- #endregion
- public HoistedStoreyClass GetGenericStorey ()
- {
- TypeContainer storey = this;
- while (storey != null && storey.CurrentTypeParameters == null)
- storey = storey.Parent;
- return storey as HoistedStoreyClass;
- }
- }
- //
- // Anonymous method storey is created when an anonymous method uses
- // variable or parameter from outer scope. They are then hoisted to
- // anonymous method storey (captured)
- //
- public class AnonymousMethodStorey : HoistedStoreyClass
- {
- struct StoreyFieldPair
- {
- public readonly AnonymousMethodStorey Storey;
- public readonly Field Field;
- public StoreyFieldPair (AnonymousMethodStorey storey, Field field)
- {
- this.Storey = storey;
- this.Field = field;
- }
- }
- //
- // Needed to delay hoisted _this_ initialization. When an anonymous
- // method is used inside ctor and _this_ is hoisted, base ctor has to
- // be called first, otherwise _this_ will be initialized with
- // uninitialized value.
- //
- sealed class ThisInitializer : Statement
- {
- readonly HoistedThis hoisted_this;
- readonly AnonymousMethodStorey parent;
- public ThisInitializer (HoistedThis hoisted_this, AnonymousMethodStorey parent)
- {
- this.hoisted_this = hoisted_this;
- this.parent = parent;
- }
- protected override void DoEmit (EmitContext ec)
- {
- Expression source;
- if (parent == null)
- source = new CompilerGeneratedThis (ec.CurrentType, loc);
- else {
- source = new FieldExpr (parent.HoistedThis.Field, Location.Null) {
- InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location.Null)
- };
- }
- hoisted_this.EmitAssign (ec, source, false, false);
- }
- protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
- {
- return false;
- }
- protected override void CloneTo (CloneContext clonectx, Statement target)
- {
- // Nothing to clone
- }
- }
- // Unique storey ID
- public readonly int ID;
- public readonly ExplicitBlock OriginalSourceBlock;
- // A list of StoreyFieldPair with local field keeping parent storey instance
- List<StoreyFieldPair> used_parent_storeys;
- List<ExplicitBlock> children_references;
- // A list of hoisted parameters
- protected List<HoistedParameter> hoisted_params;
- List<HoistedParameter> hoisted_local_params;
- protected List<HoistedVariable> hoisted_locals;
- // Hoisted this
- protected HoistedThis hoisted_this;
- // Local variable which holds this storey instance
- public Expression Instance;
- bool initialize_hoisted_this;
- AnonymousMethodStorey hoisted_this_parent;
- public AnonymousMethodStorey (ExplicitBlock block, TypeDefinition parent, MemberBase host, TypeParameters tparams, string name, MemberKind kind)
- : base (parent, MakeMemberName (host, name, parent.PartialContainer.CounterAnonymousContainers, tparams, block.StartLocation),
- tparams, 0, kind)
- {
- OriginalSourceBlock = block;
- ID = parent.PartialContainer.CounterAnonymousContainers++;
- }
- public void AddCapturedThisField (EmitContext ec, AnonymousMethodStorey parent)
- {
- TypeExpr type_expr = new TypeExpression (ec.CurrentType, Location);
- Field f = AddCompilerGeneratedField ("$this", type_expr);
- hoisted_this = new HoistedThis (this, f);
- initialize_hoisted_this = true;
- hoisted_this_parent = parent;
- }
- public Field AddCapturedVariable (string name, TypeSpec type)
- {
- CheckMembersDefined ();
- FullNamedExpression field_type = new TypeExpression (type, Location);
- if (!spec.IsGenericOrParentIsGeneric)
- return AddCompilerGeneratedField (name, field_type);
- const Modifiers mod = Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED;
- Field f = new HoistedField (this, field_type, mod, name, null, Location);
- AddField (f);
- return f;
- }
- protected Field AddCompilerGeneratedField (string name, FullNamedExpression type)
- {
- return AddCompilerGeneratedField (name, type, false);
- }
- protected Field AddCompilerGeneratedField (string name, FullNamedExpression type, bool privateAccess)
- {
- Modifiers mod = Modifiers.COMPILER_GENERATED | (privateAccess ? Modifiers.PRIVATE : Modifiers.INTERNAL);
- Field f = new Field (this, type, mod, new MemberName (name, Location), null);
- AddField (f);
- return f;
- }
- //
- // Creates a link between hoisted variable block and the anonymous method storey
- //
- // An anonymous method can reference variables from any outer block, but they are
- // hoisted in their own ExplicitBlock. When more than one block is referenced we
- // need to create another link between those variable storeys
- //
- public void AddReferenceFromChildrenBlock (ExplicitBlock block)
- {
- if (children_references == null)
- children_references = new List<ExplicitBlock> ();
- if (!children_references.Contains (block))
- children_references.Add (block);
- }
- public void AddParentStoreyReference (EmitContext ec, AnonymousMethodStorey storey)
- {
- CheckMembersDefined ();
- if (used_parent_storeys == null)
- used_parent_storeys = new List<StoreyFieldPair> ();
- else if (used_parent_storeys.Exists (i => i.Storey == storey))
- return;
- TypeExpr type_expr = storey.CreateStoreyTypeExpression (ec);
- Field f = AddCompilerGeneratedField ("<>f__ref$" + storey.ID, type_expr);
- used_parent_storeys.Add (new StoreyFieldPair (storey, f));
- }
- public void CaptureLocalVariable (ResolveContext ec, LocalVariable localVariable)
- {
- if (this is StateMachine) {
- if (ec.CurrentBlock.ParametersBlock != localVariable.Block.ParametersBlock)
- ec.CurrentBlock.Explicit.HasCapturedVariable = true;
- } else {
- ec.CurrentBlock.Explicit.HasCapturedVariable = true;
- }
- var hoisted = localVariable.HoistedVariant;
- if (hoisted != null && hoisted.Storey != this && hoisted.Storey is StateMachine) {
- //
- // Variable is already hoisted but we need it in storey which can be shared
- //
- hoisted.Storey.hoisted_locals.Remove (hoisted);
- hoisted.Storey.Members.Remove (hoisted.Field);
- hoisted = null;
- }
- if (hoisted == null) {
- hoisted = new HoistedLocalVariable (this, localVariable, GetVariableMangledName (localVariable));
- localVariable.HoistedVariant = hoisted;
- if (hoisted_locals == null)
- hoisted_locals = new List<HoistedVariable> ();
- hoisted_locals.Add (hoisted);
- }
- if (ec.CurrentBlock.Explicit != localVariable.Block.Explicit && !(hoisted.Storey is StateMachine))
- hoisted.Storey.AddReferenceFromChildrenBlock (ec.CurrentBlock.Explicit);
- }
- public void CaptureParameter (ResolveContext ec, ParametersBlock.ParameterInfo parameterInfo, ParameterReference parameterReference)
- {
- if (!(this is StateMachine)) {
- ec.CurrentBlock.Explicit.HasCapturedVariable = true;
- }
- var hoisted = parameterInfo.Parameter.HoistedVariant;
- if (parameterInfo.Block.StateMachine != null) {
- //
- // Another storey in same block exists but state machine does not
- // have parameter captured. We need to add it there as well to
- // proxy parameter value correctly.
- //
- if (hoisted == null && parameterInfo.Block.StateMachine != this) {
- var storey = parameterInfo.Block.StateMachine;
- hoisted = new HoistedParameter (storey, parameterReference);
- parameterInfo.Parameter.HoistedVariant = hoisted;
- if (storey.hoisted_params == null)
- storey.hoisted_params = new List<HoistedParameter> ();
- storey.hoisted_params.Add (hoisted);
- }
- //
- // Lift captured parameter from value type storey to reference type one. Otherwise
- // any side effects would be done on a copy
- //
- if (hoisted != null && hoisted.Storey != this && hoisted.Storey is StateMachine) {
- if (hoisted_local_params == null)
- hoisted_local_params = new List<HoistedParameter> ();
- hoisted_local_params.Add (hoisted);
- hoisted = null;
- }
- }
- if (hoisted == null) {
- hoisted = new HoistedParameter (this, parameterReference);
- parameterInfo.Parameter.HoistedVariant = hoisted;
- if (hoisted_params == null)
- hoisted_params = new List<HoistedParameter> ();
- hoisted_params.Add (hoisted);
- }
- //
- // Register link between current block and parameter storey. It will
- // be used when setting up storey definition to deploy storey reference
- // when parameters are used from multiple blocks
- //
- if (ec.CurrentBlock.Explicit != parameterInfo.Block) {
- hoisted.Storey.AddReferenceFromChildrenBlock (ec.CurrentBlock.Explicit);
- }
- }
- TypeExpr CreateStoreyTypeExpression (EmitContext ec)
- {
- //
- // Create an instance of storey type
- //
- TypeExpr storey_type_expr;
- if (CurrentTypeParameters != null) {
- //
- // Use current method type parameter (MVAR) for top level storey only. All
- // nested storeys use class type parameter (VAR)
- //
- var tparams = ec.CurrentAnonymousMethod != null && ec.CurrentAnonymousMethod.Storey != null ?
- ec.CurrentAnonymousMethod.Storey.CurrentTypeParameters :
- ec.CurrentTypeParameters;
- TypeArguments targs = new TypeArguments ();
- //
- // Use type parameter name instead of resolved type parameter
- // specification to resolve to correctly nested type parameters
- //
- for (int i = 0; i < tparams.Count; ++i)
- targs.Add (new SimpleName (tparams [i].Name, Location)); // new TypeParameterExpr (tparams[i], Location));
- storey_type_expr = new GenericTypeExpr (Definition, targs, Location);
- } else {
- storey_type_expr = new TypeExpression (CurrentType, Location);
- }
- return storey_type_expr;
- }
- public void SetNestedStoryParent (AnonymousMethodStorey parentStorey)
- {
- Parent = parentStorey;
- spec.IsGeneric = false;
- spec.DeclaringType = parentStorey.CurrentType;
- MemberName.TypeParameters = null;
- }
- protected override bool DoResolveTypeParameters ()
- {
- // Although any storey can have type parameters they are all clones of method type
- // parameters therefore have to mutate MVAR references in any of cloned constraints
- if (CurrentTypeParameters != null) {
- for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
- var spec = CurrentTypeParameters[i].Type;
- spec.BaseType = mutator.Mutate (spec.BaseType);
- if (spec.InterfacesDefined != null) {
- var mutated = new TypeSpec[spec.InterfacesDefined.Length];
- for (int ii = 0; ii < mutated.Length; ++ii) {
- mutated[ii] = mutator.Mutate (spec.InterfacesDefined[ii]);
- }
- spec.InterfacesDefined = mutated;
- }
- if (spec.TypeArguments != null) {
- spec.TypeArguments = mutator.Mutate (spec.TypeArguments);
- }
- }
- }
- //
- // Update parent cache as we most likely passed the point
- // where the cache was constructed
- //
- Parent.CurrentType.MemberCache.AddMember (this.spec);
- return true;
- }
- //
- // Initializes all hoisted variables
- //
- public void EmitStoreyInstantiation (EmitContext ec, ExplicitBlock block)
- {
- // There can be only one instance variable for each storey type
- if (Instance != null)
- throw new InternalErrorException ();
- //
- // Create an instance of this storey
- //
- ResolveContext rc = new ResolveContext (ec.MemberContext);
- rc.CurrentBlock = block;
- var storey_type_expr = CreateStoreyTypeExpression (ec);
- var source = new New (storey_type_expr, null, Location).Resolve (rc);
- //
- // When the current context is async (or iterator) lift local storey
- // instantiation to the currect storey
- //
- if (ec.CurrentAnonymousMethod is StateMachineInitializer && (block.HasYield || block.HasAwait)) {
- //
- // Unfortunately, normal capture mechanism could not be used because we are
- // too late in the pipeline and standart assign cannot be used either due to
- // recursive nature of GetStoreyInstanceExpression
- //
- var field = ec.CurrentAnonymousMethod.Storey.AddCompilerGeneratedField (
- LocalVariable.GetCompilerGeneratedName (block), storey_type_expr, true);
- field.Define ();
- field.Emit ();
- var fexpr = new FieldExpr (field, Location);
- fexpr.InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location);
- fexpr.EmitAssign (ec, source, false, false);
- Instance = fexpr;
- } else {
- var local = TemporaryVariableReference.Create (source.Type, block, Location);
- if (source.Type.IsStruct) {
- local.LocalInfo.CreateBuilder (ec);
- } else {
- local.EmitAssign (ec, source);
- }
- Instance = local;
- }
- EmitHoistedFieldsInitialization (rc, ec);
- // TODO: Implement properly
- //SymbolWriter.DefineScopeVariable (ID, Instance.Builder);
- }
- void EmitHoistedFieldsInitialization (ResolveContext rc, EmitContext ec)
- {
- //
- // Initialize all storey reference fields by using local or hoisted variables
- //
- if (used_parent_storeys != null) {
- foreach (StoreyFieldPair sf in used_parent_storeys) {
- //
- // Get instance expression of storey field
- //
- Expression instace_expr = GetStoreyInstanceExpression (ec);
- var fs = sf.Field.Spec;
- if (TypeManager.IsGenericType (instace_expr.Type))
- fs = MemberCache.GetMember (instace_expr.Type, fs);
- FieldExpr f_set_expr = new FieldExpr (fs, Location);
- f_set_expr.InstanceExpression = instace_expr;
- // TODO: CompilerAssign expression
- SimpleAssign a = new SimpleAssign (f_set_expr, sf.Storey.GetStoreyInstanceExpression (ec));
- if (a.Resolve (rc) != null)
- a.EmitStatement (ec);
- }
- }
- //
- // Initialize hoisted `this' only once, everywhere else will be
- // referenced indirectly
- //
- if (initialize_hoisted_this) {
- rc.CurrentBlock.AddScopeStatement (new ThisInitializer (hoisted_this, hoisted_this_parent));
- }
- //
- // Setting currect anonymous method to null blocks any further variable hoisting
- //
- AnonymousExpression ae = ec.CurrentAnonymousMethod;
- ec.CurrentAnonymousMethod = null;
- if (hoisted_params != null) {
- EmitHoistedParameters (ec, hoisted_params);
- }
- ec.CurrentAnonymousMethod = ae;
- }
- protected virtual void EmitHoistedParameters (EmitContext ec, List<HoistedParameter> hoisted)
- {
- foreach (HoistedParameter hp in hoisted) {
- if (hp == null)
- continue;
- //
- // Parameters could be proxied via local fields for value type storey
- //
- if (hoisted_local_params != null) {
- var local_param = hoisted_local_params.Find (l => l.Parameter.Parameter == hp.Parameter.Parameter);
- var source = new FieldExpr (local_param.Field, Location);
- source.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
- hp.EmitAssign (ec, source, false, false);
- continue;
- }
- hp.EmitHoistingAssignment (ec);
- }
- }
- //
- // Returns a field which holds referenced storey instance
- //
- Field GetReferencedStoreyField (AnonymousMethodStorey storey)
- {
- if (used_parent_storeys == null)
- return null;
- foreach (StoreyFieldPair sf in used_parent_storeys) {
- if (sf.Storey == storey)
- return sf.Field;
- }
- return null;
- }
- //
- // Creates storey instance expression regardless of currect IP
- //
- public Expression GetStoreyInstanceExpression (EmitContext ec)
- {
- AnonymousExpression am = ec.CurrentAnonymousMethod;
- //
- // Access from original block -> storey
- //
- if (am == null)
- return Instance;
- //
- // Access from anonymous method implemented as a static -> storey
- //
- if (am.Storey == null)
- return Instance;
- Field f = am.Storey.GetReferencedStoreyField (this);
- if (f == null) {
- if (am.Storey == this) {
- //
- // Access from inside of same storey (S -> S)
- //
- return new CompilerGeneratedThis (CurrentType, Location);
- }
- //
- // External field access
- //
- return Instance;
- }
- //
- // Storey was cached to local field
- //
- FieldExpr f_ind = new FieldExpr (f, Location);
- f_ind.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
- return f_ind;
- }
- protected virtual string GetVariableMangledName (LocalVariable local_info)
- {
- //
- // No need to mangle anonymous method hoisted variables cause they
- // are hoisted in their own scopes
- //
- return local_info.Name;
- }
- public HoistedThis HoistedThis {
- get {
- return hoisted_this;
- }
- set {
- hoisted_this = value;
- }
- }
- public IList<ExplicitBlock> ReferencesFromChildrenBlock {
- get { return children_references; }
- }
- }
- public abstract class HoistedVariable
- {
- //
- // Hoisted version of variable references used in expression
- // tree has to be delayed until we know its location. The variable
- // doesn't know its location until all stories are calculated
- //
- class ExpressionTreeVariableReference : Expression
- {
- readonly HoistedVariable hv;
- public ExpressionTreeVariableReference (HoistedVariable hv)
- {
- this.hv = hv;
- }
- public override bool ContainsEmitWithAwait ()
- {
- return false;
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- return hv.CreateExpressionTree ();
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- eclass = ExprClass.Value;
- type = ec.Module.PredefinedTypes.Expression.Resolve ();
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- ResolveContext rc = new ResolveContext (ec.MemberContext);
- Expression e = hv.GetFieldExpression (ec).CreateExpressionTree (rc, false);
- // This should never fail
- e = e.Resolve (rc);
- if (e != null)
- e.Emit (ec);
- }
- }
-
- protected readonly AnonymousMethodStorey storey;
- protected Field field;
- Dictionary<AnonymousExpression, FieldExpr> cached_inner_access; // TODO: Hashtable is too heavyweight
- FieldExpr cached_outer_access;
- protected HoistedVariable (AnonymousMethodStorey storey, string name, TypeSpec type)
- : this (storey, storey.AddCapturedVariable (name, type))
- {
- }
- protected HoistedVariable (AnonymousMethodStorey storey, Field field)
- {
- this.storey = storey;
- this.field = field;
- }
- public Field Field {
- get {
- return field;
- }
- }
- public AnonymousMethodStorey Storey {
- get {
- return storey;
- }
- }
- public void AddressOf (EmitContext ec, AddressOp mode)
- {
- GetFieldExpression (ec).AddressOf (ec, mode);
- }
- public Expression CreateExpressionTree ()
- {
- return new ExpressionTreeVariableReference (this);
- }
- public void Emit (EmitContext ec)
- {
- GetFieldExpression (ec).Emit (ec);
- }
- public Expression EmitToField (EmitContext ec)
- {
- return GetFieldExpression (ec);
- }
- //
- // Creates field access expression for hoisted variable
- //
- protected virtual FieldExpr GetFieldExpression (EmitContext ec)
- {
- if (ec.CurrentAnonymousMethod == null || ec.CurrentAnonymousMethod.Storey == null) {
- if (cached_outer_access != null)
- return cached_outer_access;
- //
- // When setting top-level hoisted variable in generic storey
- // change storey generic types to method generic types (VAR -> MVAR)
- //
- if (storey.Instance.Type.IsGenericOrParentIsGeneric) {
- var fs = MemberCache.GetMember (storey.Instance.Type, field.Spec);
- cached_outer_access = new FieldExpr (fs, field.Location);
- } else {
- cached_outer_access = new FieldExpr (field, field.Location);
- }
- cached_outer_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
- return cached_outer_access;
- }
- FieldExpr inner_access;
- if (cached_inner_access != null) {
- if (!cached_inner_access.TryGetValue (ec.CurrentAnonymousMethod, out inner_access))
- inner_access = null;
- } else {
- inner_access = null;
- cached_inner_access = new Dictionary<AnonymousExpression, FieldExpr> (4);
- }
- if (inner_access == null) {
- if (field.Parent.IsGenericOrParentIsGeneric) {
- var fs = MemberCache.GetMember (field.Parent.CurrentType, field.Spec);
- inner_access = new FieldExpr (fs, field.Location);
- } else {
- inner_access = new FieldExpr (field, field.Location);
- }
- inner_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
- cached_inner_access.Add (ec.CurrentAnonymousMethod, inner_access);
- }
- return inner_access;
- }
- public void Emit (EmitContext ec, bool leave_copy)
- {
- GetFieldExpression (ec).Emit (ec, leave_copy);
- }
- public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
- {
- GetFieldExpression (ec).EmitAssign (ec, source, leave_copy, false);
- }
- }
- public class HoistedParameter : HoistedVariable
- {
- sealed class HoistedFieldAssign : CompilerAssign
- {
- public HoistedFieldAssign (Expression target, Expression source)
- : base (target, source, target.Location)
- {
- }
- protected override Expression ResolveConversions (ResolveContext ec)
- {
- //
- // Implicit conversion check fails for hoisted type arguments
- // as they are of different types (!!0 x !0)
- //
- return this;
- }
- }
- readonly ParameterReference parameter;
- public HoistedParameter (AnonymousMethodStorey scope, ParameterReference par)
- : base (scope, par.Name, par.Type)
- {
- this.parameter = par;
- }
- public HoistedParameter (HoistedParameter hp, string name)
- : base (hp.storey, name, hp.parameter.Type)
- {
- this.parameter = hp.parameter;
- }
- #region Properties
- public bool IsAssigned { get; set; }
- public ParameterReference Parameter {
- get {
- return parameter;
- }
- }
- #endregion
- public void EmitHoistingAssignment (EmitContext ec)
- {
- //
- // Remove hoisted redirection to emit assignment from original parameter
- //
- var temp = parameter.Parameter.HoistedVariant;
- parameter.Parameter.HoistedVariant = null;
- var a = new HoistedFieldAssign (GetFieldExpression (ec), parameter);
- a.EmitStatement (ec);
- parameter.Parameter.HoistedVariant = temp;
- }
- }
- class HoistedLocalVariable : HoistedVariable
- {
- public HoistedLocalVariable (AnonymousMethodStorey storey, LocalVariable local, string name)
- : base (storey, name, local.Type)
- {
- }
- }
- public class HoistedThis : HoistedVariable
- {
- public HoistedThis (AnonymousMethodStorey storey, Field field)
- : base (storey, field)
- {
- }
- }
- //
- // Anonymous method expression as created by parser
- //
- public class AnonymousMethodExpression : Expression
- {
- //
- // Special conversion for nested expression tree lambdas
- //
- class Quote : ShimExpression
- {
- public Quote (Expression expr)
- : base (expr)
- {
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- var args = new Arguments (1);
- args.Add (new Argument (expr.CreateExpressionTree (ec)));
- return CreateExpressionFactoryCall (ec, "Quote", args);
- }
- protected override Expression DoResolve (ResolveContext rc)
- {
- expr = expr.Resolve (rc);
- if (expr == null)
- return null;
- eclass = expr.eclass;
- type = expr.Type;
- return this;
- }
- }
- readonly Dictionary<TypeSpec, Expression> compatibles;
- public ParametersBlock Block;
- public AnonymousMethodExpression (Location loc)
- {
- this.loc = loc;
- this.compatibles = new Dictionary<TypeSpec, Expression> ();
- }
- #region Properties
- public override string ExprClassName {
- get {
- return "anonymous method";
- }
- }
- public virtual bool HasExplicitParameters {
- get {
- return Parameters != ParametersCompiled.Undefined;
- }
- }
- public override bool IsSideEffectFree {
- get {
- return true;
- }
- }
- public ParametersCompiled Parameters {
- get {
- return Block.Parameters;
- }
- }
- public bool IsAsync {
- get;
- internal set;
- }
- public ReportPrinter TypeInferenceReportPrinter {
- get; set;
- }
- #endregion
- //
- // Returns true if the body of lambda expression can be implicitly
- // converted to the delegate of type `delegate_type'
- //
- public bool ImplicitStandardConversionExists (ResolveContext ec, TypeSpec delegate_type)
- {
- using (ec.With (ResolveContext.Options.InferReturnType, false)) {
- using (ec.Set (ResolveContext.Options.ProbingMode)) {
- var prev = ec.Report.SetPrinter (TypeInferenceReportPrinter ?? new NullReportPrinter ());
- var res = Compatible (ec, delegate_type) != null;
- ec.Report.SetPrinter (prev);
- return res;
- }
- }
- }
- TypeSpec CompatibleChecks (ResolveContext ec, TypeSpec delegate_type)
- {
- if (delegate_type.IsDelegate)
- return delegate_type;
- if (delegate_type.IsExpressionTreeType) {
- delegate_type = delegate_type.TypeArguments [0];
- if (delegate_type.IsDelegate)
- return delegate_type;
- ec.Report.Error (835, loc, "Cannot convert `{0}' to an expression tree of non-delegate type `{1}'",
- GetSignatureForError (), delegate_type.GetSignatureForError ());
- return null;
- }
- ec.Report.Error (1660, loc, "Cannot convert `{0}' to non-delegate type `{1}'",
- GetSignatureForError (), delegate_type.GetSignatureForError ());
- return null;
- }
- protected bool VerifyExplicitParameters (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type, AParametersCollection parameters)
- {
- if (VerifyParameterCompatibility (ec, tic, delegate_type, parameters, ec.IsInProbingMode))
- return true;
- if (!ec.IsInProbingMode)
- ec.Report.Error (1661, loc,
- "Cannot convert `{0}' to delegate type `{1}' since there is a parameter mismatch",
- GetSignatureForError (), delegate_type.GetSignatureForError ());
- return false;
- }
- protected bool VerifyParameterCompatibility (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type, AParametersCollection invoke_pd, bool ignore_errors)
- {
- if (Parameters.Count != invoke_pd.Count) {
- if (ignore_errors)
- return false;
-
- ec.Report.Error (1593, loc, "Delegate `{0}' does not take `{1}' arguments",
- delegate_type.GetSignatureForError (), Parameters.Count.ToString ());
- return false;
- }
- bool has_implicit_parameters = !HasExplicitParameters;
- bool error = false;
- for (int i = 0; i < Parameters.Count; ++i) {
- Parameter.Modifier p_mod = invoke_pd.FixedParameters [i].ModFlags;
- if (Parameters.FixedParameters [i].ModFlags != p_mod && p_mod != Parameter.Modifier.PARAMS) {
- if (ignore_errors)
- return false;
-
- if (p_mod == Parameter.Modifier.NONE)
- ec.Report.Error (1677, Parameters[i].Location, "Parameter `{0}' should not be declared with the `{1}' keyword",
- (i + 1).ToString (), Parameter.GetModifierSignature (Parameters [i].ModFlags));
- else
- ec.Report.Error (1676, Parameters[i].Location, "Parameter `{0}' must be declared with the `{1}' keyword",
- (i+1).ToString (), Parameter.GetModifierSignature (p_mod));
- error = true;
- }
- if (has_implicit_parameters)
- continue;
- TypeSpec type = invoke_pd.Types [i];
- if (tic != null)
- type = tic.InflateGenericArgument (ec, type);
-
- if (!TypeSpecComparer.IsEqual (type, Parameters.Types [i])) {
- if (ignore_errors)
- return false;
-
- ec.Report.Error (1678, Parameters [i].Location, "Parameter `{0}' is declared as type `{1}' but should be `{2}'",
- (i+1).ToString (),
- Parameters.Types [i].GetSignatureForError (),
- invoke_pd.Types [i].GetSignatureForError ());
- error = true;
- }
- }
- return !error;
- }
- //
- // Infers type arguments based on explicit arguments
- //
- public bool ExplicitTypeInference (TypeInferenceContext type_inference, TypeSpec delegate_type)
- {
- if (!HasExplicitParameters)
- return false;
- if (!delegate_type.IsDelegate) {
- if (!delegate_type.IsExpressionTreeType)
- return false;
- delegate_type = TypeManager.GetTypeArguments (delegate_type) [0];
- if (!delegate_type.IsDelegate)
- return false;
- }
-
- AParametersCollection d_params = Delegate.GetParameters (delegate_type);
- if (d_params.Count != Parameters.Count)
- return false;
- var ptypes = Parameters.Types;
- var dtypes = d_params.Types;
- for (int i = 0; i < Parameters.Count; ++i) {
- if (type_inference.ExactInference (ptypes[i], dtypes[i]) == 0) {
- //
- // Continue when 0 (quick path) does not mean inference failure. Checking for
- // same type handles cases like int -> int
- //
- if (ptypes[i] == dtypes[i])
- continue;
- return false;
- }
- }
- return true;
- }
- public TypeSpec InferReturnType (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type)
- {
- Expression expr;
- AnonymousExpression am;
- if (compatibles.TryGetValue (delegate_type, out expr)) {
- am = expr as AnonymousExpression;
- return am == null ? null : am.ReturnType;
- }
- using (ec.Set (ResolveContext.Options.ProbingMode | ResolveContext.Options.InferReturnType)) {
- ReportPrinter prev;
- if (TypeInferenceReportPrinter != null) {
- prev = ec.Report.SetPrinter (TypeInferenceReportPrinter);
- } else {
- prev = null;
- }
- var body = CompatibleMethodBody (ec, tic, null, delegate_type);
- if (body != null) {
- am = body.Compatible (ec, body);
- } else {
- am = null;
- }
- if (TypeInferenceReportPrinter != null) {
- ec.Report.SetPrinter (prev);
- }
- }
- if (am == null)
- return null;
- // compatibles.Add (delegate_type, am);
- return am.ReturnType;
- }
- public override bool ContainsEmitWithAwait ()
- {
- return false;
- }
- //
- // Returns AnonymousMethod container if this anonymous method
- // expression can be implicitly converted to the delegate type `delegate_type'
- //
- public Expression Compatible (ResolveContext ec, TypeSpec type)
- {
- Expression am;
- if (compatibles.TryGetValue (type, out am))
- return am;
- TypeSpec delegate_type = CompatibleChecks (ec, type);
- if (delegate_type == null)
- return null;
- //
- // At this point its the first time we know the return type that is
- // needed for the anonymous method. We create the method here.
- //
- var invoke_mb = Delegate.GetInvokeMethod (delegate_type);
- TypeSpec return_type = invoke_mb.ReturnType;
- //
- // Second: the return type of the delegate must be compatible with
- // the anonymous type. Instead of doing a pass to examine the block
- // we satisfy the rule by setting the return type on the EmitContext
- // to be the delegate type return type.
- //
- var body = CompatibleMethodBody (ec, null, return_type, delegate_type);
- if (body == null)
- return null;
- bool etree_conversion = delegate_type != type;
- try {
- if (etree_conversion) {
- if (ec.HasSet (ResolveContext.Options.ExpressionTreeConversion)) {
- //
- // Nested expression tree lambda use same scope as parent
- // lambda, this also means no variable capturing between this
- // and parent scope
- //
- am = body.Compatible (ec, ec.CurrentAnonymousMethod);
- //
- // Quote nested expression tree
- //
- if (am != null)
- am = new Quote (am);
- } else {
- int errors = ec.Report.Errors;
- if (Block.IsAsync) {
- ec.Report.Error (1989, loc, "Async lambda expressions cannot be converted to expression trees");
- }
- using (ec.Set (ResolveContext.Options.ExpressionTreeConversion)) {
- am = body.Compatible (ec);
- }
- //
- // Rewrite expressions into expression tree when targeting Expression<T>
- //
- if (am != null && errors == ec.Report.Errors)
- am = CreateExpressionTree (ec, delegate_type);
- }
- } else {
- am = body.Compatible (ec);
- if (body.DirectMethodGroupConversion != null) {
- var errors_printer = new SessionReportPrinter ();
- var old = ec.Report.SetPrinter (errors_printer);
- var expr = new ImplicitDelegateCreation (delegate_type, body.DirectMethodGroupConversion, loc) {
- AllowSpecialMethodsInvocation = true
- }.Resolve (ec);
- ec.Report.SetPrinter (old);
- if (expr != null && errors_printer.ErrorsCount == 0)
- am = expr;
- }
- }
- } catch (CompletionResult) {
- throw;
- } catch (FatalException) {
- throw;
- } catch (Exception e) {
- throw new InternalErrorException (e, loc);
- }
- if (!ec.IsInProbingMode && !etree_conversion) {
- compatibles.Add (type, am ?? EmptyExpression.Null);
- }
- return am;
- }
- protected virtual Expression CreateExpressionTree (ResolveContext ec, TypeSpec delegate_type)
- {
- return CreateExpressionTree (ec);
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- ec.Report.Error (1946, loc, "An anonymous method cannot be converted to an expression tree");
- return null;
- }
- protected virtual ParametersCompiled ResolveParameters (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type)
- {
- var delegate_parameters = Delegate.GetParameters (delegate_type);
- if (Parameters == ParametersCompiled.Undefined) {
- //
- // We provide a set of inaccessible parameters
- //
- Parameter[] fixedpars = new Parameter[delegate_parameters.Count];
- for (int i = 0; i < delegate_parameters.Count; i++) {
- Parameter.Modifier i_mod = delegate_parameters.FixedParameters [i].ModFlags;
- if ((i_mod & Parameter.Modifier.OUT) != 0) {
- if (!ec.IsInProbingMode) {
- ec.Report.Error (1688, loc,
- "Cannot convert anonymous method block without a parameter list to delegate type `{0}' because it has one or more `out' parameters",
- delegate_type.GetSignatureForError ());
- }
- return null;
- }
- fixedpars[i] = new Parameter (
- new TypeExpression (delegate_parameters.Types [i], loc), null,
- delegate_parameters.FixedParameters [i].ModFlags, null, loc);
- }
- return ParametersCompiled.CreateFullyResolved (fixedpars, delegate_parameters.Types);
- }
- if (!VerifyExplicitParameters (ec, tic, delegate_type, delegate_parameters)) {
- return null;
- }
- return Parameters;
- }
- protected override Expression DoResolve (ResolveContext rc)
- {
- if (rc.HasSet (ResolveContext.Options.ConstantScope)) {
- rc.Report.Error (1706, loc, "Anonymous methods and lambda expressions cannot be used in the current context");
- return null;
- }
- //
- // Update top-level block generated duting parsing with actual top-level block
- //
- if (rc.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.BaseInitializer) && rc.CurrentMemberDefinition.Parent.PartialContainer.PrimaryConstructorParameters != null) {
- var tb = rc.ConstructorBlock.ParametersBlock.TopBlock;
- if (Block.TopBlock != tb) {
- Block b = Block;
- while (b.Parent != Block.TopBlock && b != Block.TopBlock)
- b = b.Parent;
- b.Parent = tb;
- tb.IncludeBlock (Block, Block.TopBlock);
- b.ParametersBlock.TopBlock = tb;
- }
- }
- eclass = ExprClass.Value;
- //
- // This hack means `The type is not accessible
- // anywhere', we depend on special conversion
- // rules.
- //
- type = InternalType.AnonymousMethod;
- if (!DoResolveParameters (rc))
- return null;
- return this;
- }
- protected virtual bool DoResolveParameters (ResolveContext rc)
- {
- return Parameters.Resolve (rc);
- }
- public override void Emit (EmitContext ec)
- {
- // nothing, as we only exist to not do anything.
- }
- public static void Error_AddressOfCapturedVar (ResolveContext rc, IVariableReference var, Location loc)
- {
- if (rc.CurrentAnonymousMethod is AsyncInitializer)
- return;
- rc.Report.Error (1686, loc,
- "Local variable or parameter `{0}' cannot have their address taken and be used inside an anonymous method, lambda expression or query expression",
- var.Name);
- }
- public override string GetSignatureForError ()
- {
- return ExprClassName;
- }
- AnonymousMethodBody CompatibleMethodBody (ResolveContext ec, TypeInferenceContext tic, TypeSpec return_type, TypeSpec delegate_type)
- {
- ParametersCompiled p = ResolveParameters (ec, tic, delegate_type);
- if (p == null)
- return null;
- ParametersBlock b = ec.IsInProbingMode ? (ParametersBlock) Block.PerformClone () : Block;
- if (b.IsAsync) {
- var rt = return_type;
- if (rt != null && rt.Kind != MemberKind.Void && rt != ec.Module.PredefinedTypes.Task.TypeSpec && !rt.IsGenericTask) {
- ec.Report.Error (4010, loc, "Cannot convert async {0} to delegate type `{1}'",
- GetSignatureForError (), delegate_type.GetSignatureForError ());
- return null;
- }
- b = b.ConvertToAsyncTask (ec, ec.CurrentMemberDefinition.Parent.PartialContainer, p, return_type, delegate_type, loc);
- }
- return CompatibleMethodFactory (return_type ?? InternalType.ErrorType, delegate_type, p, b);
- }
- protected virtual AnonymousMethodBody CompatibleMethodFactory (TypeSpec return_type, TypeSpec delegate_type, ParametersCompiled p, ParametersBlock b)
- {
- return new AnonymousMethodBody (p, b, return_type, delegate_type, loc);
- }
- protected override void CloneTo (CloneContext clonectx, Expression t)
- {
- AnonymousMethodExpression target = (AnonymousMethodExpression) t;
- target.Block = (ParametersBlock) clonectx.LookupBlock (Block);
- }
-
- public override object Accept (StructuralVisitor visitor)
- {
- return visitor.Visit (this);
- }
- }
- //
- // Abstract expression for any block which requires variables hoisting
- //
- public abstract class AnonymousExpression : ExpressionStatement
- {
- protected class AnonymousMethodMethod : Method
- {
- public readonly AnonymousExpression AnonymousMethod;
- public readonly AnonymousMethodStorey Storey;
- public AnonymousMethodMethod (TypeDefinition parent, AnonymousExpression am, AnonymousMethodStorey storey,
- TypeExpr return_type,
- Modifiers mod, MemberName name,
- ParametersCompiled parameters)
- : base (parent, return_type, mod | Modifiers.COMPILER_GENERATED,
- name, parameters, null)
- {
- this.AnonymousMethod = am;
- this.Storey = storey;
- Parent.PartialContainer.Members.Add (this);
- Block = new ToplevelBlock (am.block, parameters);
- }
- public override EmitContext CreateEmitContext (ILGenerator ig, SourceMethodBuilder sourceMethod)
- {
- EmitContext ec = new EmitContext (this, ig, ReturnType, sourceMethod);
- ec.CurrentAnonymousMethod = AnonymousMethod;
- return ec;
- }
- protected override void DefineTypeParameters ()
- {
- // Type parameters were cloned
- }
- protected override bool ResolveMemberType ()
- {
- if (!base.ResolveMemberType ())
- return false;
- if (Storey != null && Storey.Mutator != null) {
- if (!parameters.IsEmpty) {
- var mutated = Storey.Mutator.Mutate (parameters.Types);
- if (mutated != parameters.Types)
- parameters = ParametersCompiled.CreateFullyResolved ((Parameter[]) parameters.FixedParameters, mutated);
- }
- member_type = Storey.Mutator.Mutate (member_type);
- }
- return true;
- }
- public override void Emit ()
- {
- if (MethodBuilder == null) {
- Define ();
- }
- base.Emit ();
- }
- }
- protected readonly ParametersBlock block;
- public TypeSpec ReturnType;
- protected AnonymousExpression (ParametersBlock block, TypeSpec return_type, Location loc)
- {
- this.ReturnType = return_type;
- this.block = block;
- this.loc = loc;
- }
- public abstract string ContainerType { get; }
- public abstract bool IsIterator { get; }
- public abstract AnonymousMethodStorey Storey { get; }
- //
- // The block that makes up the body for the anonymous method
- //
- public ParametersBlock Block {
- get {
- return block;
- }
- }
- public AnonymousExpression Compatible (ResolveContext ec)
- {
- return Compatible (ec, this);
- }
- public AnonymousExpression Compatible (ResolveContext ec, AnonymousExpression ae)
- {
- if (block.Resolved)
- return this;
- // TODO: Implement clone
- BlockContext aec = new BlockContext (ec, block, ReturnType);
- aec.CurrentAnonymousMethod = ae;
- var am = this as AnonymousMethodBody;
- if (ec.HasSet (ResolveContext.Options.InferReturnType) && am != null) {
- am.ReturnTypeInference = new TypeInferenceContext ();
- }
- var bc = ec as BlockContext;
- if (bc != null) {
- aec.AssignmentInfoOffset = bc.AssignmentInfoOffset;
- aec.EnclosingLoop = bc.EnclosingLoop;
- aec.EnclosingLoopOrSwitch = bc.EnclosingLoopOrSwitch;
- aec.Switch = bc.Switch;
- }
- var errors = ec.Report.Errors;
- bool res = Block.Resolve (aec);
- if (res && errors == ec.Report.Errors) {
- MarkReachable (new Reachability ());
- if (!CheckReachableExit (ec.Report)) {
- return null;
- }
- if (bc != null)
- bc.AssignmentInfoOffset = aec.AssignmentInfoOffset;
- }
- if (am != null && am.ReturnTypeInference != null) {
- am.ReturnTypeInference.FixAllTypes (ec);
- ReturnType = am.ReturnTypeInference.InferredTypeArguments [0];
- am.ReturnTypeInference = null;
- //
- // If e is synchronous the inferred return type is T
- // If e is asynchronous and the body of F is either an expression classified as nothing
- // or a statement block where no return statements have expressions, the inferred return type is Task
- // If e is async and has an inferred result type T, the inferred return type is Task<T>
- //
- if (block.IsAsync && ReturnType != null) {
- ReturnType = ReturnType.Kind == MemberKind.Void ?
- ec.Module.PredefinedTypes.Task.TypeSpec :
- ec.Module.PredefinedTypes.TaskGeneric.TypeSpec.MakeGenericType (ec, new [] { ReturnType });
- }
- }
- if (res && errors != ec.Report.Errors)
- return null;
- return res ? this : null;
- }
- public override bool ContainsEmitWithAwait ()
- {
- return false;
- }
- bool CheckReachableExit (Report report)
- {
- if (block.HasReachableClosingBrace && ReturnType.Kind != MemberKind.Void) {
- // FIXME: Flow-analysis on MoveNext generated code
- if (!IsIterator) {
- report.Error (1643, StartLocation,
- "Not all code paths return a value in anonymous method of type `{0}'", GetSignatureForError ());
- return false;
- }
- }
- return true;
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- // We are reachable, mark block body reachable too
- MarkReachable (new Reachability ());
- CheckReachableExit (fc.Report);
- var das = fc.BranchDefiniteAssignment ();
- var prev_pb = fc.ParametersBlock;
- fc.ParametersBlock = Block;
- var da_ontrue = fc.DefiniteAssignmentOnTrue;
- var da_onfalse = fc.DefiniteAssignmentOnFalse;
- fc.DefiniteAssignmentOnTrue = fc.DefiniteAssignmentOnFalse = null;
- block.FlowAnalysis (fc);
- fc.ParametersBlock = prev_pb;
- fc.DefiniteAssignment = das;
- fc.DefiniteAssignmentOnTrue = da_ontrue;
- fc.DefiniteAssignmentOnFalse = da_onfalse;
- }
- public override void MarkReachable (Reachability rc)
- {
- block.MarkReachable (rc);
- }
- public void SetHasThisAccess ()
- {
- ExplicitBlock b = block;
- do {
- if (b.HasCapturedThis)
- return;
- b.HasCapturedThis = true;
- b = b.Parent == null ? null : b.Parent.Explicit;
- } while (b != null);
- }
- }
- public class AnonymousMethodBody : AnonymousExpression
- {
- protected readonly ParametersCompiled parameters;
- AnonymousMethodStorey storey;
- AnonymousMethodMethod method;
- Field am_cache;
- string block_name;
- TypeInferenceContext return_inference;
- public AnonymousMethodBody (ParametersCompiled parameters,
- ParametersBlock block, TypeSpec return_type, TypeSpec delegate_type,
- Location loc)
- : base (block, return_type, loc)
- {
- this.type = delegate_type;
- this.parameters = parameters;
- }
- #region Properties
- public override string ContainerType {
- get { return "anonymous method"; }
- }
- //
- // Method-group instance for lambdas which can be replaced with
- // simple method group call
- //
- public MethodGroupExpr DirectMethodGroupConversion {
- get; set;
- }
- public override bool IsIterator {
- get {
- return false;
- }
- }
- public ParametersCompiled Parameters {
- get {
- return parameters;
- }
- }
- public TypeInferenceContext ReturnTypeInference {
- get {
- return return_inference;
- }
- set {
- return_inference = value;
- }
- }
- public override AnonymousMethodStorey Storey {
- get {
- return storey;
- }
- }
- #endregion
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- ec.Report.Error (1945, loc, "An expression tree cannot contain an anonymous method expression");
- return null;
- }
- bool Define (ResolveContext ec)
- {
- if (!Block.Resolved && Compatible (ec) == null)
- return false;
- if (block_name == null) {
- MemberCore mc = (MemberCore) ec.MemberContext;
- block_name = mc.MemberName.Basename;
- }
- return true;
- }
- //
- // Creates a host for the anonymous method
- //
- AnonymousMethodMethod DoCreateMethodHost (EmitContext ec)
- {
- //
- // Anonymous method body can be converted to
- //
- // 1, an instance method in current scope when only `this' is hoisted
- // 2, a static method in current scope when neither `this' nor any variable is hoisted
- // 3, an instance method in compiler generated storey when any hoisted variable exists
- //
- Modifiers modifiers;
- TypeDefinition parent = null;
- TypeParameters hoisted_tparams = null;
- ParametersCompiled method_parameters = parameters;
- var src_block = Block.Original.Explicit;
- if (src_block.HasCapturedVariable || src_block.HasCapturedThis) {
- parent = storey = FindBestMethodStorey ();
- if (storey == null) {
- var top_block = src_block.ParametersBlock.TopBlock;
- var sm = top_block.StateMachine;
- if (src_block.HasCapturedThis) {
- //
- // Remove hoisted 'this' request when simple instance method is
- // enough. No hoisted variables only 'this' and don't need to
- // propagate this to value type state machine.
- //
- StateMachine sm_parent;
- var pb = src_block.ParametersBlock;
- do {
- sm_parent = pb.StateMachine;
- pb = pb.Parent == null ? null : pb.Parent.ParametersBlock;
- } while (sm_parent == null && pb != null);
- if (sm_parent == null) {
- top_block.RemoveThisReferenceFromChildrenBlock (src_block);
- } else if (sm_parent.Kind == MemberKind.Struct) {
- //
- // Special case where parent class is used to emit instance method
- // because currect storey is of value type (async host) and we cannot
- // use ldftn on non-boxed instances either to share mutated state
- //
- parent = sm_parent.Parent.PartialContainer;
- hoisted_tparams = sm_parent.OriginalTypeParameters;
- } else if (sm is IteratorStorey) {
- //
- // For iterators we can host everything in one class
- //
- parent = storey = sm;
- }
- }
- }
- modifiers = storey != null ? Modifiers.INTERNAL : Modifiers.PRIVATE;
- } else {
- if (ec.CurrentAnonymousMethod != null)
- parent = storey = ec.CurrentAnonymousMethod.Storey;
- modifiers = Modifiers.STATIC | Modifiers.PRIVATE;
- //
- // Convert generated method to closed delegate method where unused
- // this argument is generated during compilation which speeds up dispatch
- // by about 25%
- //
- method_parameters = ParametersCompiled.Prefix (method_parameters,
- new Parameter (null, null, 0, null, loc), ec.Module.Compiler.BuiltinTypes.Object);
- }
- if (storey == null && hoisted_tparams == null)
- hoisted_tparams = ec.CurrentTypeParameters;
- if (parent == null)
- parent = ec.CurrentTypeDefinition.Parent.PartialContainer;
- string name = CompilerGeneratedContainer.MakeName (parent != storey ? block_name : null,
- "m", null, parent.PartialContainer.CounterAnonymousMethods++);
- MemberName member_name;
- if (hoisted_tparams != null) {
- var type_params = new TypeParameters (hoisted_tparams.Count);
- for (int i = 0; i < hoisted_tparams.Count; ++i) {
- type_params.Add (hoisted_tparams[i].CreateHoistedCopy (null));
- }
- member_name = new MemberName (name, type_params, Location);
- } else {
- member_name = new MemberName (name, Location);
- }
- return new AnonymousMethodMethod (parent,
- this, storey, new TypeExpression (ReturnType, Location), modifiers,
- member_name, method_parameters);
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- if (!Define (ec))
- return null;
- eclass = ExprClass.Value;
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- //
- // Use same anonymous method implementation for scenarios where same
- // code is used from multiple blocks, e.g. field initializers
- //
- if (method == null) {
- //
- // Delay an anonymous method definition to avoid emitting unused code
- // for unreachable blocks or expression trees
- //
- method = DoCreateMethodHost (ec);
- method.Define ();
- method.PrepareEmit ();
- }
- bool is_static = (method.ModFlags & Modifiers.STATIC) != 0;
- if (is_static && am_cache == null && !ec.IsStaticConstructor) {
- //
- // Creates a field cache to store delegate instance if it's not generic
- //
- if (!method.MemberName.IsGeneric) {
- var parent = method.Parent.PartialContainer;
- int id = parent.AnonymousMethodsCounter++;
- var cache_type = storey != null && storey.Mutator != null ? storey.Mutator.Mutate (type) : type;
- am_cache = new Field (parent, new TypeExpression (cache_type, loc),
- Modifiers.STATIC | Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED,
- new MemberName (CompilerGeneratedContainer.MakeName (null, "f", "am$cache", id), loc), null);
- am_cache.Define ();
- parent.AddField (am_cache);
- } else {
- // TODO: Implement caching of generated generic static methods
- //
- // Idea:
- //
- // Some extra class is needed to capture variable generic type
- // arguments. Maybe we could re-use anonymous types, with a unique
- // anonymous method id, but they are quite heavy.
- //
- // Consider : "() => typeof(T);"
- //
- // We need something like
- // static class Wrap<Tn, Tm, DelegateType> {
- // public static DelegateType cache;
- // }
- //
- // We then specialize local variable to capture all generic parameters
- // and delegate type, e.g. "Wrap<Ta, Tb, DelegateTypeInst> cache;"
- //
- }
- }
- Label l_initialized = ec.DefineLabel ();
- if (am_cache != null) {
- ec.Emit (OpCodes.Ldsfld, am_cache.Spec);
- ec.Emit (OpCodes.Brtrue_S, l_initialized);
- }
- //
- // Load method delegate implementation
- //
- if (is_static) {
- ec.EmitNull ();
- } else if (storey != null) {
- Expression e = storey.GetStoreyInstanceExpression (ec).Resolve (new ResolveContext (ec.MemberContext));
- if (e != null) {
- e.Emit (ec);
- }
- } else {
- ec.EmitThis ();
- //
- // Special case for value type storey where this is not lifted but
- // droped off to parent class
- //
- if (ec.CurrentAnonymousMethod != null && ec.AsyncTaskStorey != null)
- ec.Emit (OpCodes.Ldfld, ec.AsyncTaskStorey.HoistedThis.Field.Spec);
- }
- var delegate_method = method.Spec;
- if (storey != null && storey.MemberName.IsGeneric) {
- TypeSpec t = storey.Instance.Type;
- //
- // Mutate anonymous method instance type if we are in nested
- // hoisted generic anonymous method storey
- //
- if (ec.IsAnonymousStoreyMutateRequired) {
- t = storey.Mutator.Mutate (t);
- }
- ec.Emit (OpCodes.Ldftn, TypeBuilder.GetMethod (t.GetMetaInfo (), (MethodInfo) delegate_method.GetMetaInfo ()));
- } else {
- if (delegate_method.IsGeneric) {
- TypeParameterSpec[] tparams;
- var sm = ec.CurrentAnonymousMethod == null ? null : ec.CurrentAnonymousMethod.Storey as StateMachine;
- if (sm != null && sm.OriginalTypeParameters != null) {
- tparams = sm.CurrentTypeParameters.Types;
- } else {
- tparams = method.TypeParameters;
- }
- delegate_method = delegate_method.MakeGenericMethod (ec.MemberContext, tparams);
- }
- ec.Emit (OpCodes.Ldftn, delegate_method);
- }
- var constructor_method = Delegate.GetConstructor (type);
- ec.Emit (OpCodes.Newobj, constructor_method);
- if (am_cache != null) {
- ec.Emit (OpCodes.Stsfld, am_cache.Spec);
- ec.MarkLabel (l_initialized);
- ec.Emit (OpCodes.Ldsfld, am_cache.Spec);
- }
- }
- public override void EmitStatement (EmitContext ec)
- {
- throw new NotImplementedException ();
- }
- //
- // Look for the best storey for this anonymous method
- //
- AnonymousMethodStorey FindBestMethodStorey ()
- {
- //
- // Use the nearest parent block which has a storey
- //
- for (Block b = Block.Parent; b != null; b = b.Parent) {
- AnonymousMethodStorey s = b.Explicit.AnonymousMethodStorey;
- if (s != null)
- return s;
- }
-
- return null;
- }
- public override string GetSignatureForError ()
- {
- return type.GetSignatureForError ();
- }
- }
- //
- // Anonymous type container
- //
- public class AnonymousTypeClass : CompilerGeneratedContainer
- {
- public const string ClassNamePrefix = "<>__AnonType";
- public const string SignatureForError = "anonymous type";
-
- readonly IList<AnonymousTypeParameter> parameters;
- private AnonymousTypeClass (ModuleContainer parent, MemberName name, IList<AnonymousTypeParameter> parameters, Location loc)
- : base (parent, name, parent.Evaluator != null ? Modifiers.PUBLIC : Modifiers.INTERNAL)
- {
- this.parameters = parameters;
- }
- public static AnonymousTypeClass Create (TypeContainer parent, IList<AnonymousTypeParameter> parameters, Location loc)
- {
- string name = ClassNamePrefix + parent.Module.CounterAnonymousTypes++;
- ParametersCompiled all_parameters;
- TypeParameters tparams = null;
- SimpleName[] t_args;
- if (parameters.Count == 0) {
- all_parameters = ParametersCompiled.EmptyReadOnlyParameters;
- t_args = null;
- } else {
- t_args = new SimpleName[parameters.Count];
- tparams = new TypeParameters ();
- Parameter[] ctor_params = new Parameter[parameters.Count];
- for (int i = 0; i < parameters.Count; ++i) {
- AnonymousTypeParameter p = parameters[i];
- for (int ii = 0; ii < i; ++ii) {
- if (parameters[ii].Name == p.Name) {
- parent.Compiler.Report.Error (833, parameters[ii].Location,
- "`{0}': An anonymous type cannot have multiple properties with the same name",
- p.Name);
- p = new AnonymousTypeParameter (null, "$" + i.ToString (), p.Location);
- parameters[i] = p;
- break;
- }
- }
- t_args[i] = new SimpleName ("<" + p.Name + ">__T", p.Location);
- tparams.Add (new TypeParameter (i, new MemberName (t_args[i].Name, p.Location), null, null, Variance.None));
- ctor_params[i] = new Parameter (t_args[i], p.Name, Parameter.Modifier.NONE, null, p.Location);
- }
- all_parameters = new ParametersCompiled (ctor_params);
- }
- //
- // Create generic anonymous type host with generic arguments
- // named upon properties names
- //
- AnonymousTypeClass a_type = new AnonymousTypeClass (parent.Module, new MemberName (name, tparams, loc), parameters, loc);
- Constructor c = new Constructor (a_type, name, Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN,
- null, all_parameters, loc);
- c.Block = new ToplevelBlock (parent.Module.Compiler, c.ParameterInfo, loc);
- //
- // Create fields and constructor body with field initialization
- //
- bool error = false;
- for (int i = 0; i < parameters.Count; ++i) {
- AnonymousTypeParameter p = parameters [i];
- Field f = new Field (a_type, t_args [i], Modifiers.PRIVATE | Modifiers.READONLY | Modifiers.DEBUGGER_HIDDEN,
- new MemberName ("<" + p.Name + ">", p.Location), null);
- if (!a_type.AddField (f)) {
- error = true;
- continue;
- }
- c.Block.AddStatement (new StatementExpression (
- new SimpleAssign (new MemberAccess (new This (p.Location), f.Name),
- c.Block.GetParameterReference (i, p.Location))));
- ToplevelBlock get_block = new ToplevelBlock (parent.Module.Compiler, p.Location);
- get_block.AddStatement (new Return (
- new MemberAccess (new This (p.Location), f.Name), p.Location));
- Property prop = new Property (a_type, t_args [i], Modifiers.PUBLIC,
- new MemberName (p.Name, p.Location), null);
- prop.Get = new Property.GetMethod (prop, 0, null, p.Location);
- prop.Get.Block = get_block;
- a_type.AddMember (prop);
- }
- if (error)
- return null;
- a_type.AddConstructor (c);
- return a_type;
- }
-
- protected override bool DoDefineMembers ()
- {
- if (!base.DoDefineMembers ())
- return false;
- Location loc = Location;
- var equals_parameters = ParametersCompiled.CreateFullyResolved (
- new Parameter (new TypeExpression (Compiler.BuiltinTypes.Object, loc), "obj", 0, null, loc), Compiler.BuiltinTypes.Object);
- Method equals = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Bool, loc),
- Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("Equals", loc),
- equals_parameters, null);
- equals_parameters[0].Resolve (equals, 0);
- Method tostring = new Method (this, new TypeExpression (Compiler.BuiltinTypes.String, loc),
- Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("ToString", loc),
- ParametersCompiled.EmptyReadOnlyParameters, null);
- ToplevelBlock equals_block = new ToplevelBlock (Compiler, equals.ParameterInfo, loc);
- TypeExpr current_type;
- if (CurrentTypeParameters != null) {
- var targs = new TypeArguments ();
- for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
- targs.Add (new TypeParameterExpr (CurrentTypeParameters[i], Location));
- }
- current_type = new GenericTypeExpr (Definition, targs, loc);
- } else {
- current_type = new TypeExpression (Definition, loc);
- }
- var li_other = LocalVariable.CreateCompilerGenerated (CurrentType, equals_block, loc);
- equals_block.AddStatement (new BlockVariable (new TypeExpression (li_other.Type, loc), li_other));
- var other_variable = new LocalVariableReference (li_other, loc);
- MemberAccess system_collections_generic = new MemberAccess (new MemberAccess (
- new QualifiedAliasMember ("global", "System", loc), "Collections", loc), "Generic", loc);
- Expression rs_equals = null;
- Expression string_concat = new StringConstant (Compiler.BuiltinTypes, "{", loc);
- Expression rs_hashcode = new IntConstant (Compiler.BuiltinTypes, -2128831035, loc);
- for (int i = 0; i < parameters.Count; ++i) {
- var p = parameters [i];
- var f = (Field) Members [i * 2];
- MemberAccess equality_comparer = new MemberAccess (new MemberAccess (
- system_collections_generic, "EqualityComparer",
- new TypeArguments (new SimpleName (CurrentTypeParameters [i].Name, loc)), loc),
- "Default", loc);
- Arguments arguments_equal = new Arguments (2);
- arguments_equal.Add (new Argument (new MemberAccess (new This (f.Location), f.Name)));
- arguments_equal.Add (new Argument (new MemberAccess (other_variable, f.Name)));
- Expression field_equal = new Invocation (new MemberAccess (equality_comparer,
- "Equals", loc), arguments_equal);
- Arguments arguments_hashcode = new Arguments (1);
- arguments_hashcode.Add (new Argument (new MemberAccess (new This (f.Location), f.Name)));
- Expression field_hashcode = new Invocation (new MemberAccess (equality_comparer,
- "GetHashCode", loc), arguments_hashcode);
- IntConstant FNV_prime = new IntConstant (Compiler.BuiltinTypes, 16777619, loc);
- rs_hashcode = new Binary (Binary.Operator.Multiply,
- new Binary (Binary.Operator.ExclusiveOr, rs_hashcode, field_hashcode),
- FNV_prime);
- Expression field_to_string = new Conditional (new BooleanExpression (new Binary (Binary.Operator.Inequality,
- new MemberAccess (new This (f.Location), f.Name), new NullLiteral (loc))),
- new Invocation (new MemberAccess (
- new MemberAccess (new This (f.Location), f.Name), "ToString"), null),
- new StringConstant (Compiler.BuiltinTypes, string.Empty, loc), loc);
- if (rs_equals == null) {
- rs_equals = field_equal;
- string_concat = new Binary (Binary.Operator.Addition,
- string_concat,
- new Binary (Binary.Operator.Addition,
- new StringConstant (Compiler.BuiltinTypes, " " + p.Name + " = ", loc),
- field_to_string));
- continue;
- }
- //
- // Implementation of ToString () body using string concatenation
- //
- string_concat = new Binary (Binary.Operator.Addition,
- new Binary (Binary.Operator.Addition,
- string_concat,
- new StringConstant (Compiler.BuiltinTypes, ", " + p.Name + " = ", loc)),
- field_to_string);
- rs_equals = new Binary (Binary.Operator.LogicalAnd, rs_equals, field_equal);
- }
- string_concat = new Binary (Binary.Operator.Addition,
- string_concat,
- new StringConstant (Compiler.BuiltinTypes, " }", loc));
- //
- // Equals (object obj) override
- //
- var other_variable_assign = new TemporaryVariableReference (li_other, loc);
- equals_block.AddStatement (new StatementExpression (
- new SimpleAssign (other_variable_assign,
- new As (equals_block.GetParameterReference (0, loc),
- current_type, loc), loc)));
- Expression equals_test = new Binary (Binary.Operator.Inequality, other_variable, new NullLiteral (loc));
- if (rs_equals != null)
- equals_test = new Binary (Binary.Operator.LogicalAnd, equals_test, rs_equals);
- equals_block.AddStatement (new Return (equals_test, loc));
- equals.Block = equals_block;
- equals.Define ();
- Members.Add (equals);
- //
- // GetHashCode () override
- //
- Method hashcode = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Int, loc),
- Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN,
- new MemberName ("GetHashCode", loc),
- ParametersCompiled.EmptyReadOnlyParameters, null);
- //
- // Modified FNV with good avalanche behavior and uniform
- // distribution with larger hash sizes.
- //
- // const int FNV_prime = 16777619;
- // int hash = (int) 2166136261;
- // foreach (int d in data)
- // hash = (hash ^ d) * FNV_prime;
- // hash += hash << 13;
- // hash ^= hash >> 7;
- // hash += hash << 3;
- // hash ^= hash >> 17;
- // hash += hash << 5;
- ToplevelBlock hashcode_top = new ToplevelBlock (Compiler, loc);
- Block hashcode_block = new Block (hashcode_top, loc, loc);
- hashcode_top.AddStatement (new Unchecked (hashcode_block, loc));
- var li_hash = LocalVariable.CreateCompilerGenerated (Compiler.BuiltinTypes.Int, hashcode_top, loc);
- hashcode_block.AddStatement (new BlockVariable (new TypeExpression (li_hash.Type, loc), li_hash));
- LocalVariableReference hash_variable_assign = new LocalVariableReference (li_hash, loc);
- hashcode_block.AddStatement (new StatementExpression (
- new SimpleAssign (hash_variable_assign, rs_hashcode)));
- var hash_variable = new LocalVariableReference (li_hash, loc);
- hashcode_block.AddStatement (new StatementExpression (
- new CompoundAssign (Binary.Operator.Addition, hash_variable,
- new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 13, loc)))));
- hashcode_block.AddStatement (new StatementExpression (
- new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
- new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 7, loc)))));
- hashcode_block.AddStatement (new StatementExpression (
- new CompoundAssign (Binary.Operator.Addition, hash_variable,
- new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 3, loc)))));
- hashcode_block.AddStatement (new StatementExpression (
- new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
- new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 17, loc)))));
- hashcode_block.AddStatement (new StatementExpression (
- new CompoundAssign (Binary.Operator.Addition, hash_variable,
- new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 5, loc)))));
- hashcode_block.AddStatement (new Return (hash_variable, loc));
- hashcode.Block = hashcode_top;
- hashcode.Define ();
- Members.Add (hashcode);
- //
- // ToString () override
- //
- ToplevelBlock tostring_block = new ToplevelBlock (Compiler, loc);
- tostring_block.AddStatement (new Return (string_concat, loc));
- tostring.Block = tostring_block;
- tostring.Define ();
- Members.Add (tostring);
- return true;
- }
- public override string GetSignatureForError ()
- {
- return SignatureForError;
- }
- public override CompilationSourceFile GetCompilationSourceFile ()
- {
- return null;
- }
- public IList<AnonymousTypeParameter> Parameters {
- get {
- return parameters;
- }
- }
- }
- }