995 lines
29 KiB
C#
995 lines
29 KiB
C#
//
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// delegate.cs: Delegate Handler
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//
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// Authors:
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// Ravi Pratap (ravi@ximian.com)
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// Miguel de Icaza (miguel@ximian.com)
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// Marek Safar (marek.safar@gmail.com)
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//
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// Dual licensed under the terms of the MIT X11 or GNU GPL
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//
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// Copyright 2001 Ximian, Inc (http://www.ximian.com)
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// Copyright 2003-2009 Novell, Inc (http://www.novell.com)
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// Copyright 2011 Xamarin Inc
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//
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using System;
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#if STATIC
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using SecurityType = System.Collections.Generic.List<IKVM.Reflection.Emit.CustomAttributeBuilder>;
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using IKVM.Reflection;
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using IKVM.Reflection.Emit;
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#else
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using SecurityType = System.Collections.Generic.Dictionary<System.Security.Permissions.SecurityAction, System.Security.PermissionSet>;
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using System.Reflection;
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using System.Reflection.Emit;
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#endif
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namespace Mono.CSharp {
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//
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// Delegate container implementation
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//
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public class Delegate : TypeDefinition, IParametersMember
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{
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FullNamedExpression ReturnType;
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readonly ParametersCompiled parameters;
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Constructor Constructor;
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Method InvokeBuilder;
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Method BeginInvokeBuilder;
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Method EndInvokeBuilder;
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static readonly string[] attribute_targets = new string [] { "type", "return" };
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public static readonly string InvokeMethodName = "Invoke";
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Expression instance_expr;
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ReturnParameter return_attributes;
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SecurityType declarative_security;
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const Modifiers MethodModifiers = Modifiers.PUBLIC | Modifiers.VIRTUAL;
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const Modifiers AllowedModifiers =
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Modifiers.NEW |
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Modifiers.PUBLIC |
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Modifiers.PROTECTED |
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Modifiers.INTERNAL |
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Modifiers.UNSAFE |
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Modifiers.PRIVATE;
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public Delegate (TypeContainer parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, ParametersCompiled param_list,
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Attributes attrs)
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: base (parent, name, attrs, MemberKind.Delegate)
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{
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this.ReturnType = type;
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ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod_flags,
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IsTopLevel ? Modifiers.INTERNAL :
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Modifiers.PRIVATE, name.Location, Report);
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parameters = param_list;
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spec = new TypeSpec (Kind, null, this, null, ModFlags | Modifiers.SEALED);
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}
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#region Properties
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public TypeSpec MemberType {
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get {
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return ReturnType.Type;
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}
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}
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public AParametersCollection Parameters {
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get {
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return parameters;
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}
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}
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public FullNamedExpression TypExpression {
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get {
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return ReturnType;
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}
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}
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#endregion
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public override void Accept (StructuralVisitor visitor)
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{
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visitor.Visit (this);
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}
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public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
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{
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if (a.Target == AttributeTargets.ReturnValue) {
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CreateReturnBuilder ();
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return_attributes.ApplyAttributeBuilder (a, ctor, cdata, pa);
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return;
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}
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if (a.IsValidSecurityAttribute ()) {
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a.ExtractSecurityPermissionSet (ctor, ref declarative_security);
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return;
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}
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base.ApplyAttributeBuilder (a, ctor, cdata, pa);
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}
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public override AttributeTargets AttributeTargets {
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get {
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return AttributeTargets.Delegate;
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}
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}
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ReturnParameter CreateReturnBuilder ()
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{
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return return_attributes ?? (return_attributes = new ReturnParameter (this, InvokeBuilder.MethodBuilder, Location));
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}
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protected override bool DoDefineMembers ()
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{
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var builtin_types = Compiler.BuiltinTypes;
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var ctor_parameters = ParametersCompiled.CreateFullyResolved (
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new [] {
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new Parameter (new TypeExpression (builtin_types.Object, Location), "object", Parameter.Modifier.NONE, null, Location),
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new Parameter (new TypeExpression (builtin_types.IntPtr, Location), "method", Parameter.Modifier.NONE, null, Location)
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},
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new [] {
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builtin_types.Object,
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builtin_types.IntPtr
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}
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);
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Constructor = new Constructor (this, Constructor.ConstructorName,
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Modifiers.PUBLIC, null, ctor_parameters, Location);
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Constructor.Define ();
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//
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// Here the various methods like Invoke, BeginInvoke etc are defined
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//
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// First, call the `out of band' special method for
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// defining recursively any types we need:
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//
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var p = parameters;
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if (!p.Resolve (this))
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return false;
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//
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// Invoke method
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//
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// Check accessibility
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foreach (var partype in p.Types) {
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if (!IsAccessibleAs (partype)) {
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Report.SymbolRelatedToPreviousError (partype);
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Report.Error (59, Location,
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"Inconsistent accessibility: parameter type `{0}' is less accessible than delegate `{1}'",
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partype.GetSignatureForError (), GetSignatureForError ());
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}
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}
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var ret_type = ReturnType.ResolveAsType (this);
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if (ret_type == null)
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return false;
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//
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// We don't have to check any others because they are all
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// guaranteed to be accessible - they are standard types.
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//
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if (!IsAccessibleAs (ret_type)) {
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Report.SymbolRelatedToPreviousError (ret_type);
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Report.Error (58, Location,
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"Inconsistent accessibility: return type `" +
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ret_type.GetSignatureForError () + "' is less " +
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"accessible than delegate `" + GetSignatureForError () + "'");
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return false;
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}
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CheckProtectedModifier ();
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if (ret_type.IsSpecialRuntimeType && Compiler.Settings.StdLib) {
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Method.Error_ReturnTypeCantBeRefAny (Location, ret_type, Report);
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return false;
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}
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VarianceDecl.CheckTypeVariance (ret_type, Variance.Covariant, this);
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var resolved_rt = new TypeExpression (ret_type, Location);
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InvokeBuilder = new Method (this, resolved_rt, MethodModifiers, new MemberName (InvokeMethodName), p, null);
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InvokeBuilder.Define ();
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//
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// Don't emit async method for compiler generated delegates (e.g. dynamic site containers)
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//
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if (!IsCompilerGenerated) {
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DefineAsyncMethods (resolved_rt);
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}
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return true;
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}
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void DefineAsyncMethods (TypeExpression returnType)
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{
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var iasync_result = Module.PredefinedTypes.IAsyncResult;
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var async_callback = Module.PredefinedTypes.AsyncCallback;
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//
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// It's ok when async types don't exist, the delegate will have Invoke method only
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//
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if (!iasync_result.Define () || !async_callback.Define ())
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return;
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//
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// BeginInvoke
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//
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ParametersCompiled async_parameters;
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if (Parameters.Count == 0) {
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async_parameters = ParametersCompiled.EmptyReadOnlyParameters;
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} else {
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var compiled = new Parameter[Parameters.Count];
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for (int i = 0; i < compiled.Length; ++i) {
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var p = parameters[i];
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compiled[i] = new Parameter (new TypeExpression (parameters.Types[i], Location),
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p.Name,
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p.ModFlags & Parameter.Modifier.RefOutMask,
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p.OptAttributes == null ? null : p.OptAttributes.Clone (), Location);
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}
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async_parameters = new ParametersCompiled (compiled);
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}
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async_parameters = ParametersCompiled.MergeGenerated (Compiler, async_parameters, false,
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new Parameter[] {
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new Parameter (new TypeExpression (async_callback.TypeSpec, Location), "callback", Parameter.Modifier.NONE, null, Location),
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new Parameter (new TypeExpression (Compiler.BuiltinTypes.Object, Location), "object", Parameter.Modifier.NONE, null, Location)
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},
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new [] {
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async_callback.TypeSpec,
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Compiler.BuiltinTypes.Object
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}
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);
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BeginInvokeBuilder = new Method (this,
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new TypeExpression (iasync_result.TypeSpec, Location), MethodModifiers,
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new MemberName ("BeginInvoke"), async_parameters, null);
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BeginInvokeBuilder.Define ();
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//
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// EndInvoke is a bit more interesting, all the parameters labeled as
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// out or ref have to be duplicated here.
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//
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//
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// Define parameters, and count out/ref parameters
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//
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ParametersCompiled end_parameters;
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int out_params = 0;
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foreach (Parameter p in Parameters.FixedParameters) {
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if ((p.ModFlags & Parameter.Modifier.RefOutMask) != 0)
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++out_params;
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}
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if (out_params > 0) {
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Parameter[] end_params = new Parameter[out_params];
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int param = 0;
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for (int i = 0; i < Parameters.FixedParameters.Length; ++i) {
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Parameter p = parameters [i];
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if ((p.ModFlags & Parameter.Modifier.RefOutMask) == 0)
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continue;
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end_params [param++] = new Parameter (new TypeExpression (p.Type, Location),
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p.Name,
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p.ModFlags & Parameter.Modifier.RefOutMask,
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p.OptAttributes == null ? null : p.OptAttributes.Clone (), Location);
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}
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end_parameters = new ParametersCompiled (end_params);
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} else {
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end_parameters = ParametersCompiled.EmptyReadOnlyParameters;
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}
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end_parameters = ParametersCompiled.MergeGenerated (Compiler, end_parameters, false,
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new Parameter (
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new TypeExpression (iasync_result.TypeSpec, Location),
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"result", Parameter.Modifier.NONE, null, Location),
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iasync_result.TypeSpec);
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//
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// Create method, define parameters, register parameters with type system
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//
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EndInvokeBuilder = new Method (this, returnType, MethodModifiers, new MemberName ("EndInvoke"), end_parameters, null);
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EndInvokeBuilder.Define ();
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}
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public override void PrepareEmit ()
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{
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if ((caching_flags & Flags.CloseTypeCreated) != 0)
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return;
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InvokeBuilder.PrepareEmit ();
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if (BeginInvokeBuilder != null) {
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BeginInvokeBuilder.TypeExpression = null;
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EndInvokeBuilder.TypeExpression = null;
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BeginInvokeBuilder.PrepareEmit ();
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EndInvokeBuilder.PrepareEmit ();
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}
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}
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public override void Emit ()
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{
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base.Emit ();
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if (declarative_security != null) {
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foreach (var de in declarative_security) {
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#if STATIC
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TypeBuilder.__AddDeclarativeSecurity (de);
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#else
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TypeBuilder.AddDeclarativeSecurity (de.Key, de.Value);
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#endif
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}
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}
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var rtype = ReturnType.Type;
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if (rtype != null) {
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if (rtype.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
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Module.PredefinedAttributes.Dynamic.EmitAttribute (CreateReturnBuilder ().Builder);
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} else if (rtype.HasDynamicElement) {
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Module.PredefinedAttributes.Dynamic.EmitAttribute (CreateReturnBuilder ().Builder, rtype, Location);
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} else if (rtype is ReadOnlyReferenceContainer) {
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Module.PredefinedAttributes.IsReadOnly.EmitAttribute (CreateReturnBuilder ().Builder);
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}
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if (rtype.HasNamedTupleElement) {
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Module.PredefinedAttributes.TupleElementNames.EmitAttribute (CreateReturnBuilder ().Builder, rtype, Location);
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}
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ConstraintChecker.Check (this, ReturnType.Type, ReturnType.Location);
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}
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Constructor.ParameterInfo.ApplyAttributes (this, Constructor.ConstructorBuilder);
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Constructor.ConstructorBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
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parameters.CheckConstraints (this);
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parameters.ApplyAttributes (this, InvokeBuilder.MethodBuilder);
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InvokeBuilder.MethodBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
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if (BeginInvokeBuilder != null) {
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BeginInvokeBuilder.ParameterInfo.ApplyAttributes (this, BeginInvokeBuilder.MethodBuilder);
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EndInvokeBuilder.ParameterInfo.ApplyAttributes (this, EndInvokeBuilder.MethodBuilder);
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BeginInvokeBuilder.MethodBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
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EndInvokeBuilder.MethodBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
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}
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}
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protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
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{
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base_type = Compiler.BuiltinTypes.MulticastDelegate;
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base_class = null;
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return null;
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}
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protected override TypeAttributes TypeAttr {
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get {
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return base.TypeAttr | TypeAttributes.Class | TypeAttributes.Sealed;
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}
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}
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public override string[] ValidAttributeTargets {
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get {
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return attribute_targets;
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}
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}
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//TODO: duplicate
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protected override bool VerifyClsCompliance ()
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{
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if (!base.VerifyClsCompliance ()) {
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return false;
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}
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parameters.VerifyClsCompliance (this);
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if (!InvokeBuilder.MemberType.IsCLSCompliant ()) {
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Report.Warning (3002, 1, Location, "Return type of `{0}' is not CLS-compliant",
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GetSignatureForError ());
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}
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return true;
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}
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public static MethodSpec GetConstructor (TypeSpec delType)
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{
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var ctor = MemberCache.FindMember (delType, MemberFilter.Constructor (null), BindingRestriction.DeclaredOnly);
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return (MethodSpec) ctor;
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}
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//
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// Returns the "Invoke" from a delegate type
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//
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public static MethodSpec GetInvokeMethod (TypeSpec delType)
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{
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var invoke = MemberCache.FindMember (delType,
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MemberFilter.Method (InvokeMethodName, 0, null, null),
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BindingRestriction.DeclaredOnly);
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return (MethodSpec) invoke;
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}
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public static AParametersCollection GetParameters (TypeSpec delType)
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{
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var invoke_mb = GetInvokeMethod (delType);
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return invoke_mb.Parameters;
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}
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//
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// 15.2 Delegate compatibility
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//
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public static bool IsTypeCovariant (ResolveContext rc, TypeSpec a, TypeSpec b)
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{
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//
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// For each value parameter (a parameter with no ref or out modifier), an
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// identity conversion or implicit reference conversion exists from the
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// parameter type in D to the corresponding parameter type in M
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//
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if (a == b)
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return true;
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if (rc.Module.Compiler.Settings.Version == LanguageVersion.ISO_1)
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return false;
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if (a.IsGenericParameter && b.IsGenericParameter)
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return a == b;
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return Convert.ImplicitReferenceConversionExists (a, b);
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}
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public static string FullDelegateDesc (MethodSpec invoke_method)
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{
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return TypeManager.GetFullNameSignature (invoke_method).Replace (".Invoke", "");
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}
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public Expression InstanceExpression {
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get {
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return instance_expr;
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}
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set {
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instance_expr = value;
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}
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}
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}
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//
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// Base class for `NewDelegate' and `ImplicitDelegateCreation'
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//
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public abstract class DelegateCreation : Expression, OverloadResolver.IErrorHandler
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{
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protected MethodSpec constructor_method;
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protected MethodGroupExpr method_group;
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public bool AllowSpecialMethodsInvocation { get; set; }
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public override bool ContainsEmitWithAwait ()
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{
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var instance = method_group.InstanceExpression;
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return instance != null && instance.ContainsEmitWithAwait ();
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}
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public static Arguments CreateDelegateMethodArguments (ResolveContext rc, AParametersCollection pd, TypeSpec[] types, Location loc)
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{
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Arguments delegate_arguments = new Arguments (pd.Count);
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for (int i = 0; i < pd.Count; ++i) {
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Argument.AType atype_modifier;
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switch (pd.FixedParameters [i].ModFlags & Parameter.Modifier.RefOutMask) {
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case Parameter.Modifier.REF:
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atype_modifier = Argument.AType.Ref;
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break;
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case Parameter.Modifier.OUT:
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atype_modifier = Argument.AType.Out;
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break;
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default:
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atype_modifier = 0;
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break;
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}
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var ptype = types[i];
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if (ptype.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
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ptype = rc.BuiltinTypes.Object;
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delegate_arguments.Add (new Argument (new TypeExpression (ptype, loc), atype_modifier));
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}
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return delegate_arguments;
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}
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public override Expression CreateExpressionTree (ResolveContext ec)
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{
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Arguments args = new Arguments (2);
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args.Add (new Argument (new TypeOf (type, loc)));
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if (method_group.InstanceExpression == null)
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args.Add (new Argument (new NullLiteral (loc)));
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else
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args.Add (new Argument (method_group.InstanceExpression));
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Expression ma;
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var create_v45 = ec.Module.PredefinedMembers.MethodInfoCreateDelegate.Get ();
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if (create_v45 != null) {
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//
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// .NET 4.5 has better API but it produces different instance than Delegate::CreateDelegate
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// and because csc uses this enhancement we have to as well to be fully compatible
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//
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var mg = MethodGroupExpr.CreatePredefined (create_v45, create_v45.DeclaringType, loc);
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mg.InstanceExpression = method_group.CreateExpressionTree (ec);
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ma = mg;
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} else {
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ma = new MemberAccess (new MemberAccess (new QualifiedAliasMember ("global", "System", loc), "Delegate", loc), "CreateDelegate", loc);
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args.Add (new Argument (method_group.CreateExpressionTree (ec)));
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}
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Expression e = new Invocation (ma, args).Resolve (ec);
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if (e == null)
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return null;
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e = Convert.ExplicitConversion (ec, e, type, loc);
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if (e == null)
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return null;
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return e.CreateExpressionTree (ec);
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}
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void ResolveConditionalAccessReceiver (ResolveContext rc)
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{
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// LAMESPEC: Not sure why this is explicitly disallowed with very odd error message
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if (!rc.HasSet (ResolveContext.Options.DontSetConditionalAccessReceiver) && method_group.HasConditionalAccess ()) {
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Error_OperatorCannotBeApplied (rc, loc, "?", method_group.Type);
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}
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}
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protected override Expression DoResolve (ResolveContext ec)
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{
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constructor_method = Delegate.GetConstructor (type);
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var invoke_method = Delegate.GetInvokeMethod (type);
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ResolveConditionalAccessReceiver (ec);
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Arguments arguments = CreateDelegateMethodArguments (ec, invoke_method.Parameters, invoke_method.Parameters.Types, loc);
|
|
method_group = method_group.OverloadResolve (ec, ref arguments, this, OverloadResolver.Restrictions.CovariantDelegate);
|
|
|
|
if (method_group == null)
|
|
return null;
|
|
|
|
var delegate_method = method_group.BestCandidate;
|
|
|
|
if (delegate_method.DeclaringType.IsNullableType) {
|
|
ec.Report.Error (1728, loc, "Cannot create delegate from method `{0}' because it is a member of System.Nullable<T> type",
|
|
delegate_method.GetSignatureForError ());
|
|
return null;
|
|
}
|
|
|
|
if (!AllowSpecialMethodsInvocation)
|
|
Invocation.IsSpecialMethodInvocation (ec, delegate_method, loc);
|
|
|
|
ExtensionMethodGroupExpr emg = method_group as ExtensionMethodGroupExpr;
|
|
if (emg != null) {
|
|
method_group.InstanceExpression = emg.ExtensionExpression;
|
|
TypeSpec e_type = emg.ExtensionExpression.Type;
|
|
if (TypeSpec.IsValueType (e_type)) {
|
|
ec.Report.Error (1113, loc, "Extension method `{0}' of value type `{1}' cannot be used to create delegates",
|
|
delegate_method.GetSignatureForError (), e_type.GetSignatureForError ());
|
|
}
|
|
}
|
|
|
|
TypeSpec rt = method_group.BestCandidateReturnType;
|
|
if (rt.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
|
|
rt = ec.BuiltinTypes.Object;
|
|
|
|
if (!Delegate.IsTypeCovariant (ec, rt, invoke_method.ReturnType)) {
|
|
Error_ConversionFailed (ec, delegate_method, delegate_method.ReturnType);
|
|
}
|
|
|
|
if (method_group.IsConditionallyExcluded) {
|
|
ec.Report.SymbolRelatedToPreviousError (delegate_method);
|
|
MethodOrOperator m = delegate_method.MemberDefinition as MethodOrOperator;
|
|
if (m != null && m.IsPartialDefinition) {
|
|
ec.Report.Error (762, loc, "Cannot create delegate from partial method declaration `{0}'",
|
|
delegate_method.GetSignatureForError ());
|
|
} else {
|
|
ec.Report.Error (1618, loc, "Cannot create delegate with `{0}' because it has a Conditional attribute",
|
|
TypeManager.CSharpSignature (delegate_method));
|
|
}
|
|
}
|
|
|
|
var expr = method_group.InstanceExpression;
|
|
if (expr != null && (expr.Type.IsGenericParameter || !TypeSpec.IsReferenceType (expr.Type))) {
|
|
if (expr.Type.IsByRefLike || expr.Type.IsSpecialRuntimeType) {
|
|
// CSC: Should be better error code
|
|
Error_ConversionFailed (ec, delegate_method, null);
|
|
}
|
|
|
|
method_group.InstanceExpression = new BoxedCast (expr, ec.BuiltinTypes.Object);
|
|
}
|
|
|
|
eclass = ExprClass.Value;
|
|
return this;
|
|
}
|
|
|
|
public override void Emit (EmitContext ec)
|
|
{
|
|
if (method_group.InstanceExpression == null) {
|
|
ec.EmitNull ();
|
|
} else {
|
|
var ie = new InstanceEmitter (method_group.InstanceExpression, false);
|
|
ie.Emit (ec, method_group.ConditionalAccess);
|
|
}
|
|
|
|
var delegate_method = method_group.BestCandidate;
|
|
|
|
// Any delegate must be sealed
|
|
if (!delegate_method.DeclaringType.IsDelegate && delegate_method.IsVirtual && !method_group.IsBase) {
|
|
ec.Emit (OpCodes.Dup);
|
|
ec.Emit (OpCodes.Ldvirtftn, delegate_method);
|
|
} else {
|
|
ec.Emit (OpCodes.Ldftn, delegate_method);
|
|
}
|
|
|
|
ec.Emit (OpCodes.Newobj, constructor_method);
|
|
}
|
|
|
|
public override void FlowAnalysis (FlowAnalysisContext fc)
|
|
{
|
|
base.FlowAnalysis (fc);
|
|
method_group.FlowAnalysis (fc);
|
|
}
|
|
|
|
void Error_ConversionFailed (ResolveContext ec, MethodSpec method, TypeSpec return_type)
|
|
{
|
|
var invoke_method = Delegate.GetInvokeMethod (type);
|
|
string member_name = method_group.InstanceExpression != null ?
|
|
Delegate.FullDelegateDesc (method) :
|
|
TypeManager.GetFullNameSignature (method);
|
|
|
|
ec.Report.SymbolRelatedToPreviousError (type);
|
|
ec.Report.SymbolRelatedToPreviousError (method);
|
|
if (ec.Module.Compiler.Settings.Version == LanguageVersion.ISO_1) {
|
|
ec.Report.Error (410, loc, "A method or delegate `{0} {1}' parameters and return type must be same as delegate `{2} {3}' parameters and return type",
|
|
method.ReturnType.GetSignatureForError (), member_name,
|
|
invoke_method.ReturnType.GetSignatureForError (), Delegate.FullDelegateDesc (invoke_method));
|
|
return;
|
|
}
|
|
|
|
if (return_type == null) {
|
|
ec.Report.Error (123, loc, "A method or delegate `{0}' parameters do not match delegate `{1}' parameters",
|
|
member_name, Delegate.FullDelegateDesc (invoke_method));
|
|
return;
|
|
}
|
|
|
|
if (invoke_method.ReturnType.Kind == MemberKind.ByRef) {
|
|
ec.Report.Error (8189, loc, "By reference return delegate does not match `{0}' return type",
|
|
Delegate.FullDelegateDesc (invoke_method));
|
|
return;
|
|
}
|
|
|
|
ec.Report.Error (407, loc, "A method or delegate `{0} {1}' return type does not match delegate `{2} {3}' return type",
|
|
return_type.GetSignatureForError (), member_name,
|
|
invoke_method.ReturnType.GetSignatureForError (), Delegate.FullDelegateDesc (invoke_method));
|
|
}
|
|
|
|
public static bool ImplicitStandardConversionExists (ResolveContext ec, MethodGroupExpr mg, TypeSpec target_type)
|
|
{
|
|
// if (target_type == TypeManager.delegate_type || target_type == TypeManager.multicast_delegate_type)
|
|
// return false;
|
|
|
|
var invoke = Delegate.GetInvokeMethod (target_type);
|
|
|
|
Arguments arguments = CreateDelegateMethodArguments (ec, invoke.Parameters, invoke.Parameters.Types, mg.Location);
|
|
mg = mg.OverloadResolve (ec, ref arguments, null, OverloadResolver.Restrictions.CovariantDelegate | OverloadResolver.Restrictions.ProbingOnly);
|
|
return mg != null && Delegate.IsTypeCovariant (ec, mg.BestCandidateReturnType, invoke.ReturnType);
|
|
}
|
|
|
|
#region IErrorHandler Members
|
|
|
|
bool OverloadResolver.IErrorHandler.AmbiguousCandidates (ResolveContext ec, MemberSpec best, MemberSpec ambiguous)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool OverloadResolver.IErrorHandler.ArgumentMismatch (ResolveContext rc, MemberSpec best, Argument arg, int index)
|
|
{
|
|
Error_ConversionFailed (rc, best as MethodSpec, null);
|
|
return true;
|
|
}
|
|
|
|
bool OverloadResolver.IErrorHandler.NoArgumentMatch (ResolveContext rc, MemberSpec best)
|
|
{
|
|
Error_ConversionFailed (rc, best as MethodSpec, null);
|
|
return true;
|
|
}
|
|
|
|
bool OverloadResolver.IErrorHandler.TypeInferenceFailed (ResolveContext rc, MemberSpec best)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
|
|
//
|
|
// Created from the conversion code
|
|
//
|
|
public class ImplicitDelegateCreation : DelegateCreation
|
|
{
|
|
Field mg_cache;
|
|
|
|
public ImplicitDelegateCreation (TypeSpec delegateType, MethodGroupExpr mg, Location loc)
|
|
{
|
|
type = delegateType;
|
|
this.method_group = mg;
|
|
this.loc = loc;
|
|
}
|
|
|
|
//
|
|
// Returns true when type is MVAR or has MVAR reference
|
|
//
|
|
public static bool ContainsMethodTypeParameter (TypeSpec type)
|
|
{
|
|
var tps = type as TypeParameterSpec;
|
|
if (tps != null)
|
|
return tps.IsMethodOwned;
|
|
|
|
var ec = type as ElementTypeSpec;
|
|
if (ec != null)
|
|
return ContainsMethodTypeParameter (ec.Element);
|
|
|
|
foreach (var t in type.TypeArguments) {
|
|
if (ContainsMethodTypeParameter (t)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
if (type.IsNested)
|
|
return ContainsMethodTypeParameter (type.DeclaringType);
|
|
|
|
return false;
|
|
}
|
|
|
|
bool HasMvar ()
|
|
{
|
|
if (ContainsMethodTypeParameter (type))
|
|
return false;
|
|
|
|
var best = method_group.BestCandidate;
|
|
if (ContainsMethodTypeParameter (best.DeclaringType))
|
|
return false;
|
|
|
|
if (best.TypeArguments != null) {
|
|
foreach (var ta in best.TypeArguments) {
|
|
if (ContainsMethodTypeParameter (ta))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
protected override Expression DoResolve (ResolveContext ec)
|
|
{
|
|
var expr = base.DoResolve (ec);
|
|
if (expr == null)
|
|
return ErrorExpression.Instance;
|
|
|
|
if (ec.IsInProbingMode)
|
|
return expr;
|
|
|
|
//
|
|
// Cache any static delegate creation
|
|
//
|
|
if (method_group.InstanceExpression != null)
|
|
return expr;
|
|
|
|
//
|
|
// Cannot easily cache types with MVAR
|
|
//
|
|
if (!HasMvar ())
|
|
return expr;
|
|
|
|
//
|
|
// Create type level cache for a delegate instance
|
|
//
|
|
var parent = ec.CurrentMemberDefinition.Parent.PartialContainer;
|
|
int id = parent.MethodGroupsCounter++;
|
|
|
|
mg_cache = new Field (parent, new TypeExpression (type, loc),
|
|
Modifiers.STATIC | Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED,
|
|
new MemberName (CompilerGeneratedContainer.MakeName (null, "f", "mg$cache", id), loc), null);
|
|
mg_cache.Define ();
|
|
parent.AddField (mg_cache);
|
|
|
|
return expr;
|
|
}
|
|
|
|
public override void Emit (EmitContext ec)
|
|
{
|
|
Label l_initialized = ec.DefineLabel ();
|
|
|
|
if (mg_cache != null) {
|
|
ec.Emit (OpCodes.Ldsfld, mg_cache.Spec);
|
|
ec.Emit (OpCodes.Brtrue_S, l_initialized);
|
|
}
|
|
|
|
base.Emit (ec);
|
|
|
|
if (mg_cache != null) {
|
|
ec.Emit (OpCodes.Stsfld, mg_cache.Spec);
|
|
ec.MarkLabel (l_initialized);
|
|
ec.Emit (OpCodes.Ldsfld, mg_cache.Spec);
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// A delegate-creation-expression, invoked from the `New' class
|
|
//
|
|
public class NewDelegate : DelegateCreation
|
|
{
|
|
public Arguments Arguments;
|
|
|
|
//
|
|
// This constructor is invoked from the `New' expression
|
|
//
|
|
public NewDelegate (TypeSpec type, Arguments Arguments, Location loc)
|
|
{
|
|
this.type = type;
|
|
this.Arguments = Arguments;
|
|
this.loc = loc;
|
|
}
|
|
|
|
protected override Expression DoResolve (ResolveContext ec)
|
|
{
|
|
if (Arguments == null || Arguments.Count != 1) {
|
|
ec.Report.Error (149, loc, "Method name expected");
|
|
return null;
|
|
}
|
|
|
|
Argument a = Arguments [0];
|
|
if (!a.ResolveMethodGroup (ec))
|
|
return null;
|
|
|
|
Expression e = a.Expr;
|
|
|
|
AnonymousMethodExpression ame = e as AnonymousMethodExpression;
|
|
if (ame != null && ec.Module.Compiler.Settings.Version != LanguageVersion.ISO_1) {
|
|
e = ame.Compatible (ec, type);
|
|
if (e == null)
|
|
return null;
|
|
|
|
return e.Resolve (ec);
|
|
}
|
|
|
|
method_group = e as MethodGroupExpr;
|
|
if (method_group == null) {
|
|
if (e.Type.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
|
|
e = Convert.ImplicitConversionRequired (ec, e, type, loc);
|
|
} else if (!e.Type.IsDelegate) {
|
|
e.Error_UnexpectedKind (ec, ResolveFlags.MethodGroup | ResolveFlags.Type, loc);
|
|
return null;
|
|
}
|
|
|
|
//
|
|
// An argument is not a method but another delegate
|
|
//
|
|
method_group = new MethodGroupExpr (Delegate.GetInvokeMethod (e.Type), e.Type, loc);
|
|
method_group.InstanceExpression = e;
|
|
}
|
|
|
|
return base.DoResolve (ec);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Invocation converted to delegate Invoke call
|
|
//
|
|
class DelegateInvocation : ExpressionStatement
|
|
{
|
|
readonly Expression InstanceExpr;
|
|
readonly bool conditionalAccessReceiver;
|
|
Arguments arguments;
|
|
MethodSpec method;
|
|
|
|
public DelegateInvocation (Expression instance_expr, Arguments args, bool conditionalAccessReceiver, Location loc)
|
|
{
|
|
this.InstanceExpr = instance_expr;
|
|
this.arguments = args;
|
|
this.conditionalAccessReceiver = conditionalAccessReceiver;
|
|
this.loc = loc;
|
|
}
|
|
|
|
public override bool ContainsEmitWithAwait ()
|
|
{
|
|
return InstanceExpr.ContainsEmitWithAwait () || (arguments != null && arguments.ContainsEmitWithAwait ());
|
|
}
|
|
|
|
public override Expression CreateExpressionTree (ResolveContext ec)
|
|
{
|
|
Arguments args = Arguments.CreateForExpressionTree (ec, this.arguments,
|
|
InstanceExpr.CreateExpressionTree (ec));
|
|
|
|
return CreateExpressionFactoryCall (ec, "Invoke", args);
|
|
}
|
|
|
|
public override void FlowAnalysis (FlowAnalysisContext fc)
|
|
{
|
|
InstanceExpr.FlowAnalysis (fc);
|
|
if (arguments != null)
|
|
arguments.FlowAnalysis (fc);
|
|
}
|
|
|
|
protected override Expression DoResolve (ResolveContext ec)
|
|
{
|
|
TypeSpec del_type = InstanceExpr.Type;
|
|
if (del_type == null)
|
|
return null;
|
|
|
|
//
|
|
// Do only core overload resolution the rest of the checks has been
|
|
// done on primary expression
|
|
//
|
|
method = Delegate.GetInvokeMethod (del_type);
|
|
var res = new OverloadResolver (new MemberSpec[] { method }, OverloadResolver.Restrictions.DelegateInvoke, loc);
|
|
var valid = res.ResolveMember<MethodSpec> (ec, ref arguments);
|
|
if (valid == null && !res.BestCandidateIsDynamic)
|
|
return null;
|
|
|
|
type = method.ReturnType;
|
|
if (conditionalAccessReceiver)
|
|
type = LiftMemberType (ec, type);
|
|
|
|
eclass = ExprClass.Value;
|
|
return this;
|
|
}
|
|
|
|
public override void Emit (EmitContext ec)
|
|
{
|
|
if (conditionalAccessReceiver) {
|
|
ec.ConditionalAccess = new ConditionalAccessContext (type, ec.DefineLabel ());
|
|
}
|
|
|
|
//
|
|
// Invocation on delegates call the virtual Invoke member
|
|
// so we are always `instance' calls
|
|
//
|
|
var call = new CallEmitter ();
|
|
call.InstanceExpression = InstanceExpr;
|
|
call.Emit (ec, method, arguments, loc);
|
|
|
|
if (conditionalAccessReceiver)
|
|
ec.CloseConditionalAccess (type.IsNullableType && type != method.ReturnType ? type : null);
|
|
}
|
|
|
|
public override void EmitStatement (EmitContext ec)
|
|
{
|
|
if (conditionalAccessReceiver) {
|
|
ec.ConditionalAccess = new ConditionalAccessContext (type, ec.DefineLabel ()) {
|
|
Statement = true
|
|
};
|
|
}
|
|
|
|
var call = new CallEmitter ();
|
|
call.InstanceExpression = InstanceExpr;
|
|
call.EmitStatement (ec, method, arguments, loc);
|
|
|
|
if (conditionalAccessReceiver)
|
|
ec.CloseConditionalAccess (null);
|
|
}
|
|
|
|
public override System.Linq.Expressions.Expression MakeExpression (BuilderContext ctx)
|
|
{
|
|
return Invocation.MakeExpression (ctx, InstanceExpr, method, arguments);
|
|
}
|
|
}
|
|
}
|