//
-// generic.cs: Support classes for generics to reduce differences from GMCS
+// generic.cs: Generics support
//
-// Author:
-// Raja R Harinath <rharinath@novell.com>
+// Authors: Martin Baulig (martin@ximian.com)
+// Miguel de Icaza (miguel@ximian.com)
+// Marek Safar (marek.safar@gmail.com)
//
-// (C) 2006 Novell, Inc.
+// Dual licensed under the terms of the MIT X11 or GNU GPL
+//
+// Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
+// Copyright 2004-2008 Novell, Inc
//
using System;
using System.Reflection;
using System.Reflection.Emit;
+using System.Globalization;
using System.Collections;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Mono.CSharp {
-namespace Mono.CSharp
-{
- public abstract class GenericConstraints
- {
+ /// <summary>
+ /// Abstract base class for type parameter constraints.
+ /// The type parameter can come from a generic type definition or from reflection.
+ /// </summary>
+ public abstract class GenericConstraints {
public abstract string TypeParameter {
get;
}
- public bool IsReferenceType {
- get { throw new NotSupportedException (); }
+ public abstract GenericParameterAttributes Attributes {
+ get;
}
- }
- public abstract class Constraints : GenericConstraints
- {
- public Constraints Clone ()
- {
- throw new NotImplementedException ();
+ public bool HasConstructorConstraint {
+ get { return (Attributes & GenericParameterAttributes.DefaultConstructorConstraint) != 0; }
}
- public abstract Location Location {
- get;
+ public bool HasReferenceTypeConstraint {
+ get { return (Attributes & GenericParameterAttributes.ReferenceTypeConstraint) != 0; }
}
- public abstract void VerifyClsCompliance ();
- }
-
- public class TypeParameter : MemberCore, IMemberContainer
- {
- public TypeParameter (DeclSpace parent, DeclSpace decl, string name,
- Constraints constraints, Attributes attrs, Location loc)
- : base (parent, new MemberName (name, loc), attrs)
- {
- throw new NotImplementedException ();
+ public bool HasValueTypeConstraint {
+ get { return (Attributes & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0; }
}
- public static string GetSignatureForError (TypeParameter[] tp)
- {
- throw new NotImplementedException ();
+ public virtual bool HasClassConstraint {
+ get { return ClassConstraint != null; }
}
- //
- // MemberContainer
- //
-
- public override bool Define ()
- {
- return true;
+ public abstract Type ClassConstraint {
+ get;
}
- public override void ApplyAttributeBuilder (Attribute a,
- CustomAttributeBuilder cb)
- {
- throw new NotImplementedException ();
+ public abstract Type[] InterfaceConstraints {
+ get;
}
- public override AttributeTargets AttributeTargets {
- get { throw new NotImplementedException (); }
+ public abstract Type EffectiveBaseClass {
+ get;
}
- public override string[] ValidAttributeTargets {
+ // <summary>
+ // Returns whether the type parameter is "known to be a reference type".
+ // </summary>
+ public virtual bool IsReferenceType {
get {
- return new string [] { "type parameter" };
+ if (HasReferenceTypeConstraint)
+ return true;
+ if (HasValueTypeConstraint)
+ return false;
+
+ if (ClassConstraint != null) {
+ if (ClassConstraint.IsValueType)
+ return false;
+
+ if (ClassConstraint != TypeManager.object_type)
+ return true;
+ }
+
+ foreach (Type t in InterfaceConstraints) {
+ if (!t.IsGenericParameter)
+ continue;
+
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
+ if ((gc != null) && gc.IsReferenceType)
+ return true;
+ }
+
+ return false;
}
}
- public Constraints Constraints {
+ // <summary>
+ // Returns whether the type parameter is "known to be a value type".
+ // </summary>
+ public virtual bool IsValueType {
get {
- return null;
+ if (HasValueTypeConstraint)
+ return true;
+ if (HasReferenceTypeConstraint)
+ return false;
+
+ if (ClassConstraint != null) {
+ if (!ClassConstraint.IsValueType)
+ return false;
+
+ if (ClassConstraint != TypeManager.value_type)
+ return true;
+ }
+
+ foreach (Type t in InterfaceConstraints) {
+ if (!t.IsGenericParameter)
+ continue;
+
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
+ if ((gc != null) && gc.IsValueType)
+ return true;
+ }
+
+ return false;
}
}
+ }
- public override string DocCommentHeader {
- get { throw new NotImplementedException (); }
- }
+ public enum SpecialConstraint
+ {
+ Constructor,
+ ReferenceType,
+ ValueType
+ }
- public bool Resolve (DeclSpace ds)
+ /// <summary>
+ /// Tracks the constraints for a type parameter from a generic type definition.
+ /// </summary>
+ public class Constraints : GenericConstraints {
+ string name;
+ ArrayList constraints;
+ Location loc;
+
+ //
+ // name is the identifier, constraints is an arraylist of
+ // Expressions (with types) or `true' for the constructor constraint.
+ //
+ public Constraints (string name, ArrayList constraints,
+ Location loc)
{
- throw new NotImplementedException ();
+ this.name = name;
+ this.constraints = constraints;
+ this.loc = loc;
}
- public bool DefineType (IResolveContext ec)
- {
- throw new NotImplementedException ();
+ public override string TypeParameter {
+ get {
+ return name;
+ }
}
- public bool DefineType (IResolveContext ec, MethodBuilder builder,
- MethodInfo implementing, bool is_override)
+ public Constraints Clone ()
{
- throw new NotImplementedException ();
+ return new Constraints (name, constraints, loc);
}
- public bool CheckDependencies ()
+ GenericParameterAttributes attrs;
+ TypeExpr class_constraint;
+ ArrayList iface_constraints;
+ ArrayList type_param_constraints;
+ int num_constraints;
+ Type class_constraint_type;
+ Type[] iface_constraint_types;
+ Type effective_base_type;
+ bool resolved;
+ bool resolved_types;
+
+ /// <summary>
+ /// Resolve the constraints - but only resolve things into Expression's, not
+ /// into actual types.
+ /// </summary>
+ public bool Resolve (IResolveContext ec)
{
- throw new NotImplementedException ();
+ if (resolved)
+ return true;
+
+ iface_constraints = new ArrayList (2); // TODO: Too expensive allocation
+ type_param_constraints = new ArrayList ();
+
+ foreach (object obj in constraints) {
+ if (HasConstructorConstraint) {
+ Report.Error (401, loc,
+ "The new() constraint must be the last constraint specified");
+ return false;
+ }
+
+ if (obj is SpecialConstraint) {
+ SpecialConstraint sc = (SpecialConstraint) obj;
+
+ if (sc == SpecialConstraint.Constructor) {
+ if (!HasValueTypeConstraint) {
+ attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
+ continue;
+ }
+
+ Report.Error (451, loc, "The `new()' constraint " +
+ "cannot be used with the `struct' constraint");
+ return false;
+ }
+
+ if ((num_constraints > 0) || HasReferenceTypeConstraint || HasValueTypeConstraint) {
+ Report.Error (449, loc, "The `class' or `struct' " +
+ "constraint must be the first constraint specified");
+ return false;
+ }
+
+ if (sc == SpecialConstraint.ReferenceType)
+ attrs |= GenericParameterAttributes.ReferenceTypeConstraint;
+ else
+ attrs |= GenericParameterAttributes.NotNullableValueTypeConstraint;
+ continue;
+ }
+
+ int errors = Report.Errors;
+ FullNamedExpression fn = ((Expression) obj).ResolveAsTypeStep (ec, false);
+
+ if (fn == null) {
+ if (errors != Report.Errors)
+ return false;
+
+ NamespaceEntry.Error_NamespaceNotFound (loc, ((Expression)obj).GetSignatureForError ());
+ return false;
+ }
+
+ TypeExpr expr;
+ ConstructedType cexpr = fn as ConstructedType;
+ if (cexpr != null) {
+ if (!cexpr.ResolveConstructedType (ec))
+ return false;
+
+ expr = cexpr;
+ } else
+ expr = ((Expression) obj).ResolveAsTypeTerminal (ec, false);
+
+ if ((expr == null) || (expr.Type == null))
+ return false;
+
+ if (!ec.GenericDeclContainer.IsAccessibleAs (fn.Type)) {
+ Report.SymbolRelatedToPreviousError (fn.Type);
+ Report.Error (703, loc,
+ "Inconsistent accessibility: constraint type `{0}' is less accessible than `{1}'",
+ fn.GetSignatureForError (), ec.GenericDeclContainer.GetSignatureForError ());
+ return false;
+ }
+
+ TypeParameterExpr texpr = expr as TypeParameterExpr;
+ if (texpr != null)
+ type_param_constraints.Add (expr);
+ else if (expr.IsInterface)
+ iface_constraints.Add (expr);
+ else if (class_constraint != null || iface_constraints.Count != 0) {
+ Report.Error (406, loc,
+ "The class type constraint `{0}' must be listed before any other constraints. Consider moving type constraint to the beginning of the constraint list",
+ expr.GetSignatureForError ());
+ return false;
+ } else if (HasReferenceTypeConstraint || HasValueTypeConstraint) {
+ Report.Error (450, loc, "`{0}': cannot specify both " +
+ "a constraint class and the `class' " +
+ "or `struct' constraint", expr.GetSignatureForError ());
+ return false;
+ } else
+ class_constraint = expr;
+
+ num_constraints++;
+ }
+
+ ArrayList list = new ArrayList ();
+ foreach (TypeExpr iface_constraint in iface_constraints) {
+ foreach (Type type in list) {
+ if (!type.Equals (iface_constraint.Type))
+ continue;
+
+ Report.Error (405, loc,
+ "Duplicate constraint `{0}' for type " +
+ "parameter `{1}'.", iface_constraint.GetSignatureForError (),
+ name);
+ return false;
+ }
+
+ list.Add (iface_constraint.Type);
+ }
+
+ foreach (TypeParameterExpr expr in type_param_constraints) {
+ foreach (Type type in list) {
+ if (!type.Equals (expr.Type))
+ continue;
+
+ Report.Error (405, loc,
+ "Duplicate constraint `{0}' for type " +
+ "parameter `{1}'.", expr.GetSignatureForError (), name);
+ return false;
+ }
+
+ list.Add (expr.Type);
+ }
+
+ iface_constraint_types = new Type [list.Count];
+ list.CopyTo (iface_constraint_types, 0);
+
+ if (class_constraint != null) {
+ class_constraint_type = class_constraint.Type;
+ if (class_constraint_type == null)
+ return false;
+
+ if (class_constraint_type.IsSealed) {
+ if (class_constraint_type.IsAbstract)
+ {
+ Report.Error (717, loc, "`{0}' is not a valid constraint. Static classes cannot be used as constraints",
+ TypeManager.CSharpName (class_constraint_type));
+ }
+ else
+ {
+ Report.Error (701, loc, "`{0}' is not a valid constraint. A constraint must be an interface, " +
+ "a non-sealed class or a type parameter", TypeManager.CSharpName(class_constraint_type));
+ }
+ return false;
+ }
+
+ if ((class_constraint_type == TypeManager.array_type) ||
+ (class_constraint_type == TypeManager.delegate_type) ||
+ (class_constraint_type == TypeManager.enum_type) ||
+ (class_constraint_type == TypeManager.value_type) ||
+ (class_constraint_type == TypeManager.object_type) ||
+ class_constraint_type == TypeManager.multicast_delegate_type) {
+ Report.Error (702, loc,
+ "A constraint cannot be special class `{0}'",
+ TypeManager.CSharpName (class_constraint_type));
+ return false;
+ }
+ }
+
+ if (class_constraint_type != null)
+ effective_base_type = class_constraint_type;
+ else if (HasValueTypeConstraint)
+ effective_base_type = TypeManager.value_type;
+ else
+ effective_base_type = TypeManager.object_type;
+
+ if ((attrs & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0)
+ attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
+
+ resolved = true;
+ return true;
}
- public bool UpdateConstraints (IResolveContext ec, Constraints new_constraints)
+ bool CheckTypeParameterConstraints (TypeParameter tparam, ref TypeExpr prevConstraint, ArrayList seen)
{
- throw new NotImplementedException ();
- }
+ seen.Add (tparam);
- //
- // IMemberContainer
- //
+ Constraints constraints = tparam.Constraints;
+ if (constraints == null)
+ return true;
- Type IMemberContainer.Type {
- get { throw new NotImplementedException (); }
- }
+ if (constraints.HasValueTypeConstraint) {
+ Report.Error (456, loc,
+ "Type parameter `{0}' has the `struct' constraint, so it cannot be used as a constraint for `{1}'",
+ tparam.Name, name);
+ return false;
+ }
- string IMemberContainer.Name {
- get { throw new NotImplementedException (); }
- }
+ //
+ // Checks whether there are no conflicts between type parameter constraints
+ //
+ // class Foo<T, U>
+ // where T : A
+ // where U : A, B // A and B are not convertible
+ //
+ if (constraints.HasClassConstraint) {
+ if (prevConstraint != null) {
+ Type t2 = constraints.ClassConstraint;
+ TypeExpr e2 = constraints.class_constraint;
- MemberCache IMemberContainer.BaseCache {
- get { throw new NotImplementedException (); }
- }
+ if (!Convert.ImplicitReferenceConversionExists (prevConstraint, t2) &&
+ !Convert.ImplicitReferenceConversionExists (e2, prevConstraint.Type)) {
+ Report.Error (455, loc,
+ "Type parameter `{0}' inherits conflicting constraints `{1}' and `{2}'",
+ name, TypeManager.CSharpName (prevConstraint.Type), TypeManager.CSharpName (t2));
+ return false;
+ }
+ }
- bool IMemberContainer.IsInterface {
- get { throw new NotImplementedException (); }
+ prevConstraint = constraints.class_constraint;
+ }
+
+ if (constraints.type_param_constraints == null)
+ return true;
+
+ foreach (TypeParameterExpr expr in constraints.type_param_constraints) {
+ if (seen.Contains (expr.TypeParameter)) {
+ Report.Error (454, loc, "Circular constraint " +
+ "dependency involving `{0}' and `{1}'",
+ tparam.Name, expr.GetSignatureForError ());
+ return false;
+ }
+
+ if (!CheckTypeParameterConstraints (expr.TypeParameter, ref prevConstraint, seen))
+ return false;
+ }
+
+ return true;
}
- MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
+ /// <summary>
+ /// Resolve the constraints into actual types.
+ /// </summary>
+ public bool ResolveTypes (IResolveContext ec)
{
- throw new NotImplementedException ();
+ if (resolved_types)
+ return true;
+
+ resolved_types = true;
+
+ foreach (object obj in constraints) {
+ ConstructedType cexpr = obj as ConstructedType;
+ if (cexpr == null)
+ continue;
+
+ if (!cexpr.CheckConstraints (ec))
+ return false;
+ }
+
+ if (type_param_constraints.Count != 0) {
+ ArrayList seen = new ArrayList ();
+ TypeExpr prev_constraint = class_constraint;
+ foreach (TypeParameterExpr expr in type_param_constraints) {
+ if (!CheckTypeParameterConstraints (expr.TypeParameter, ref prev_constraint, seen))
+ return false;
+ seen.Clear ();
+ }
+ }
+
+ for (int i = 0; i < iface_constraints.Count; ++i) {
+ TypeExpr iface_constraint = (TypeExpr) iface_constraints [i];
+ iface_constraint = iface_constraint.ResolveAsTypeTerminal (ec, false);
+ if (iface_constraint == null)
+ return false;
+ iface_constraints [i] = iface_constraint;
+ }
+
+ if (class_constraint != null) {
+ class_constraint = class_constraint.ResolveAsTypeTerminal (ec, false);
+ if (class_constraint == null)
+ return false;
+ }
+
+ return true;
}
- public bool IsSubclassOf (Type t)
- {
- throw new NotImplementedException ();
+ public override GenericParameterAttributes Attributes {
+ get { return attrs; }
}
- public MemberList FindMembers (MemberTypes mt, BindingFlags bf,
- MemberFilter filter, object criteria)
- {
- throw new NotImplementedException ();
+ public override bool HasClassConstraint {
+ get { return class_constraint != null; }
}
- }
- public class TypeParameterExpr : TypeExpr
- {
- public override string Name {
- get { throw new NotImplementedException (); }
+ public override Type ClassConstraint {
+ get { return class_constraint_type; }
}
- public override string FullName {
- get { throw new NotImplementedException (); }
+ public override Type[] InterfaceConstraints {
+ get { return iface_constraint_types; }
}
- public TypeParameterExpr (TypeParameter type_parameter, Location loc)
- {
- throw new NotImplementedException ();
+ public override Type EffectiveBaseClass {
+ get { return effective_base_type; }
}
- protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
+ public bool IsSubclassOf (Type t)
{
- return null;
- }
- }
+ if ((class_constraint_type != null) &&
+ class_constraint_type.IsSubclassOf (t))
+ return true;
- public class TypeParameterName : SimpleName
- {
- Attributes attributes;
+ if (iface_constraint_types == null)
+ return false;
- public TypeParameterName (string name, Attributes attrs, Location loc)
- : base (name, loc)
- {
- attributes = attrs;
+ foreach (Type iface in iface_constraint_types) {
+ if (TypeManager.IsSubclassOf (iface, t))
+ return true;
+ }
+
+ return false;
}
- public Attributes OptAttributes {
+ public Location Location {
get {
- return attributes;
+ return loc;
}
}
- }
- public class ConstructedType : TypeExpr
- {
- public ConstructedType (FullNamedExpression fname, TypeArguments args, Location l)
+ /// <summary>
+ /// This is used when we're implementing a generic interface method.
+ /// Each method type parameter in implementing method must have the same
+ /// constraints than the corresponding type parameter in the interface
+ /// method. To do that, we're called on each of the implementing method's
+ /// type parameters.
+ /// </summary>
+ public bool AreEqual (GenericConstraints gc)
{
- throw new NotImplementedException ();
- }
+ if (gc.Attributes != attrs)
+ return false;
- public ConstructedType (Type t, TypeParameter[] type_params, Location l)
- {
- throw new NotImplementedException ();
- }
+ if (HasClassConstraint != gc.HasClassConstraint)
+ return false;
+ if (HasClassConstraint && !TypeManager.IsEqual (gc.ClassConstraint, ClassConstraint))
+ return false;
- public ConstructedType (Type t, TypeArguments args, Location l)
- {
- throw new NotImplementedException ();
- }
+ int gc_icount = gc.InterfaceConstraints != null ?
+ gc.InterfaceConstraints.Length : 0;
+ int icount = InterfaceConstraints != null ?
+ InterfaceConstraints.Length : 0;
- public override string Name {
- get { throw new NotImplementedException (); }
- }
+ if (gc_icount != icount)
+ return false;
+
+ for (int i = 0; i < gc.InterfaceConstraints.Length; ++i) {
+ Type iface = gc.InterfaceConstraints [i];
+ if (iface.IsGenericType)
+ iface = iface.GetGenericTypeDefinition ();
+
+ bool ok = false;
+ for (int ii = 0; i < InterfaceConstraints.Length; ++ii) {
+ Type check = InterfaceConstraints [ii];
+ if (check.IsGenericType)
+ check = check.GetGenericTypeDefinition ();
+
+ if (TypeManager.IsEqual (iface, check)) {
+ ok = true;
+ break;
+ }
+ }
- public override string FullName {
- get { throw new NotImplementedException (); }
+ if (!ok)
+ return false;
+ }
+
+ return true;
}
- protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
+ public void VerifyClsCompliance ()
{
- throw new NotImplementedException ();
+ if (class_constraint_type != null && !AttributeTester.IsClsCompliant (class_constraint_type))
+ Warning_ConstrainIsNotClsCompliant (class_constraint_type, class_constraint.Location);
+
+ if (iface_constraint_types != null) {
+ for (int i = 0; i < iface_constraint_types.Length; ++i) {
+ if (!AttributeTester.IsClsCompliant (iface_constraint_types [i]))
+ Warning_ConstrainIsNotClsCompliant (iface_constraint_types [i],
+ ((TypeExpr)iface_constraints [i]).Location);
+ }
+ }
}
- public bool CheckConstraints (IResolveContext ec)
+ void Warning_ConstrainIsNotClsCompliant (Type t, Location loc)
{
- throw new NotImplementedException ();
+ Report.SymbolRelatedToPreviousError (t);
+ Report.Warning (3024, 1, loc, "Constraint type `{0}' is not CLS-compliant",
+ TypeManager.CSharpName (t));
}
}
- public class GenericMethod : DeclSpace
+ /// <summary>
+ /// A type parameter from a generic type definition.
+ /// </summary>
+ public class TypeParameter : MemberCore, IMemberContainer
{
- public GenericMethod (NamespaceEntry ns, DeclSpace parent, MemberName name,
- Expression return_type, Parameters parameters)
- : base (ns, parent, name, null)
- {
- throw new NotImplementedException ();
- }
+ static readonly string[] attribute_target = new string [] { "type parameter" };
+
+ string name;
+ DeclSpace decl;
+ GenericConstraints gc;
+ Constraints constraints;
+ GenericTypeParameterBuilder type;
+ MemberCache member_cache;
- public override TypeBuilder DefineType ()
+ public TypeParameter (DeclSpace parent, DeclSpace decl, string name,
+ Constraints constraints, Attributes attrs, Location loc)
+ : base (parent, new MemberName (name, loc), attrs)
{
- throw new NotImplementedException ();
+ this.name = name;
+ this.decl = decl;
+ this.constraints = constraints;
}
- public override bool Define ()
- {
- throw new NotImplementedException ();
+ public GenericConstraints GenericConstraints {
+ get { return gc != null ? gc : constraints; }
}
- public bool DefineType (EmitContext ec, MethodBuilder mb,
- MethodInfo implementing, bool is_override)
- {
- throw new NotImplementedException ();
+ public Constraints Constraints {
+ get { return constraints; }
}
- public void EmitAttributes ()
- {
- throw new NotImplementedException ();
+ public DeclSpace DeclSpace {
+ get { return decl; }
}
- public override bool DefineMembers ()
- {
- throw new NotImplementedException ();
+ public Type Type {
+ get { return type; }
}
-
- internal static void Error_ParameterNameCollision (Location loc, string name, string collisionWith)
+
+ /// <summary>
+ /// This is the first method which is called during the resolving
+ /// process; we're called immediately after creating the type parameters
+ /// with SRE (by calling `DefineGenericParameters()' on the TypeBuilder /
+ /// MethodBuilder).
+ ///
+ /// We're either called from TypeContainer.DefineType() or from
+ /// GenericMethod.Define() (called from Method.Define()).
+ /// </summary>
+ public void Define (GenericTypeParameterBuilder type)
{
- }
+ if (this.type != null)
+ throw new InvalidOperationException ();
- public override MemberCache MemberCache {
- get { throw new NotImplementedException (); }
+ this.type = type;
+ TypeManager.AddTypeParameter (type, this);
}
- public override AttributeTargets AttributeTargets {
- get {
- return AttributeTargets.Method | AttributeTargets.ReturnValue;
+ /// <summary>
+ /// This is the second method which is called during the resolving
+ /// process - in case of class type parameters, we're called from
+ /// TypeContainer.ResolveType() - after it resolved the class'es
+ /// base class and interfaces. For method type parameters, we're
+ /// called immediately after Define().
+ ///
+ /// We're just resolving the constraints into expressions here, we
+ /// don't resolve them into actual types.
+ ///
+ /// Note that in the special case of partial generic classes, we may be
+ /// called _before_ Define() and we may also be called multiple types.
+ /// </summary>
+ public bool Resolve (DeclSpace ds)
+ {
+ if (constraints != null) {
+ if (!constraints.Resolve (ds)) {
+ constraints = null;
+ return false;
+ }
}
- }
- public override string DocCommentHeader {
- get { return "M:"; }
+ return true;
}
- public new void VerifyClsCompliance ()
+ /// <summary>
+ /// This is the third method which is called during the resolving
+ /// process. We're called immediately after calling DefineConstraints()
+ /// on all of the current class'es type parameters.
+ ///
+ /// Our job is to resolve the constraints to actual types.
+ ///
+ /// Note that we may have circular dependencies on type parameters - this
+ /// is why Resolve() and ResolveType() are separate.
+ /// </summary>
+ public bool ResolveType (IResolveContext ec)
{
- throw new NotImplementedException ();
+ if (constraints != null) {
+ if (!constraints.ResolveTypes (ec)) {
+ constraints = null;
+ return false;
+ }
+ }
+
+ return true;
}
- }
- public class TypeArguments
- {
- public TypeArguments (Location loc)
+ /// <summary>
+ /// This is the fourth and last method which is called during the resolving
+ /// process. We're called after everything is fully resolved and actually
+ /// register the constraints with SRE and the TypeManager.
+ /// </summary>
+ public bool DefineType (IResolveContext ec)
{
- throw new NotImplementedException ();
+ return DefineType (ec, null, null, false);
}
-
- public TypeArguments (Location loc, params Expression[] types)
- {
- throw new NotImplementedException ();
- }
- public void Add (Expression type)
+ /// <summary>
+ /// This is the fith and last method which is called during the resolving
+ /// process. We're called after everything is fully resolved and actually
+ /// register the constraints with SRE and the TypeManager.
+ ///
+ /// The `builder', `implementing' and `is_override' arguments are only
+ /// applicable to method type parameters.
+ /// </summary>
+ public bool DefineType (IResolveContext ec, MethodBuilder builder,
+ MethodInfo implementing, bool is_override)
{
- throw new NotImplementedException ();
+ if (!ResolveType (ec))
+ return false;
+
+ if (implementing != null) {
+ if (is_override && (constraints != null)) {
+ Report.Error (460, Location,
+ "`{0}': Cannot specify constraints for overrides or explicit interface implementation methods",
+ TypeManager.CSharpSignature (builder));
+ return false;
+ }
+
+ MethodBase mb = TypeManager.DropGenericMethodArguments (implementing);
+
+ int pos = type.GenericParameterPosition;
+ Type mparam = mb.GetGenericArguments () [pos];
+ GenericConstraints temp_gc = ReflectionConstraints.GetConstraints (mparam);
+
+ if (temp_gc != null)
+ gc = new InflatedConstraints (temp_gc, implementing.DeclaringType);
+ else if (constraints != null)
+ gc = new InflatedConstraints (constraints, implementing.DeclaringType);
+
+ bool ok = true;
+ if (constraints != null) {
+ if (temp_gc == null)
+ ok = false;
+ else if (!constraints.AreEqual (gc))
+ ok = false;
+ } else {
+ if (!is_override && (temp_gc != null))
+ ok = false;
+ }
+
+ if (!ok) {
+ Report.SymbolRelatedToPreviousError (implementing);
+
+ Report.Error (
+ 425, Location, "The constraints for type " +
+ "parameter `{0}' of method `{1}' must match " +
+ "the constraints for type parameter `{2}' " +
+ "of interface method `{3}'. Consider using " +
+ "an explicit interface implementation instead",
+ Name, TypeManager.CSharpSignature (builder),
+ TypeManager.CSharpName (mparam), TypeManager.CSharpSignature (mb));
+ return false;
+ }
+ } else if (DeclSpace is CompilerGeneratedClass) {
+ TypeParameter[] tparams = DeclSpace.TypeParameters;
+ Type[] types = new Type [tparams.Length];
+ for (int i = 0; i < tparams.Length; i++)
+ types [i] = tparams [i].Type;
+
+ if (constraints != null)
+ gc = new InflatedConstraints (constraints, types);
+ } else {
+ gc = (GenericConstraints) constraints;
+ }
+
+ if (gc == null)
+ return true;
+
+ if (gc.HasClassConstraint || gc.HasValueTypeConstraint)
+ type.SetBaseTypeConstraint (gc.EffectiveBaseClass);
+
+ type.SetInterfaceConstraints (gc.InterfaceConstraints);
+ type.SetGenericParameterAttributes (gc.Attributes);
+ TypeManager.RegisterBuilder (type, gc.InterfaceConstraints);
+
+ return true;
}
- public void Add (TypeArguments new_args)
+ /// <summary>
+ /// This is called for each part of a partial generic type definition.
+ ///
+ /// If `new_constraints' is not null and we don't already have constraints,
+ /// they become our constraints. If we already have constraints, we must
+ /// check that they're the same.
+ /// con
+ /// </summary>
+ public bool UpdateConstraints (IResolveContext ec, Constraints new_constraints)
{
- throw new NotImplementedException ();
+ if (type == null)
+ throw new InvalidOperationException ();
+
+ if (new_constraints == null)
+ return true;
+
+ if (!new_constraints.Resolve (ec))
+ return false;
+ if (!new_constraints.ResolveTypes (ec))
+ return false;
+
+ if (constraints != null)
+ return constraints.AreEqual (new_constraints);
+
+ constraints = new_constraints;
+ return true;
}
- public bool Resolve (IResolveContext ec)
+ public override void Emit ()
{
- throw new NotImplementedException ();
- }
+ if (OptAttributes != null)
+ OptAttributes.Emit ();
- public Type[] Arguments {
- get { throw new NotImplementedException (); }
+ base.Emit ();
}
- public int Count {
- get { throw new NotImplementedException (); }
+ public override string DocCommentHeader {
+ get {
+ throw new InvalidOperationException (
+ "Unexpected attempt to get doc comment from " + this.GetType () + ".");
+ }
}
- public bool IsUnbound {
- get { throw new NotImplementedException (); }
- }
+ //
+ // MemberContainer
+ //
- public TypeParameterName[] GetDeclarations ()
+ public override bool Define ()
{
- throw new NotImplementedException ();
+ return true;
}
+
+ public override void ApplyAttributeBuilder (Attribute a,
+ CustomAttributeBuilder cb)
+ {
+ type.SetCustomAttribute (cb);
+ }
+
+ public override AttributeTargets AttributeTargets {
+ get {
+ return AttributeTargets.GenericParameter;
+ }
+ }
+
+ public override string[] ValidAttributeTargets {
+ get {
+ return attribute_target;
+ }
+ }
+
+ //
+ // IMemberContainer
+ //
+
+ string IMemberContainer.Name {
+ get { return Name; }
+ }
+
+ MemberCache IMemberContainer.BaseCache {
+ get {
+ if (gc == null)
+ return null;
+
+ if (gc.EffectiveBaseClass.BaseType == null)
+ return null;
+
+ return TypeManager.LookupMemberCache (gc.EffectiveBaseClass.BaseType);
+ }
+ }
+
+ bool IMemberContainer.IsInterface {
+ get { return false; }
+ }
+
+ MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
+ {
+ throw new NotSupportedException ();
+ }
+
+ public MemberCache MemberCache {
+ get {
+ if (member_cache != null)
+ return member_cache;
+
+ if (gc == null)
+ return null;
+
+ Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
+ member_cache = new MemberCache (this, gc.EffectiveBaseClass, ifaces);
+
+ return member_cache;
+ }
+ }
+
+ public MemberList FindMembers (MemberTypes mt, BindingFlags bf,
+ MemberFilter filter, object criteria)
+ {
+ if (gc == null)
+ return MemberList.Empty;
+
+ ArrayList members = new ArrayList ();
+
+ if (gc.HasClassConstraint) {
+ MemberList list = TypeManager.FindMembers (
+ gc.ClassConstraint, mt, bf, filter, criteria);
+
+ members.AddRange (list);
+ }
+
+ Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
+ foreach (Type t in ifaces) {
+ MemberList list = TypeManager.FindMembers (
+ t, mt, bf, filter, criteria);
+
+ members.AddRange (list);
+ }
+
+ return new MemberList (members);
+ }
+
+ public bool IsSubclassOf (Type t)
+ {
+ if (type.Equals (t))
+ return true;
+
+ if (constraints != null)
+ return constraints.IsSubclassOf (t);
+
+ return false;
+ }
+
+ public override string ToString ()
+ {
+ return "TypeParameter[" + name + "]";
+ }
+
+ public static string GetSignatureForError (TypeParameter[] tp)
+ {
+ if (tp == null || tp.Length == 0)
+ return "";
+
+ StringBuilder sb = new StringBuilder ("<");
+ for (int i = 0; i < tp.Length; ++i) {
+ if (i > 0)
+ sb.Append (",");
+ sb.Append (tp[i].GetSignatureForError ());
+ }
+ sb.Append ('>');
+ return sb.ToString ();
+ }
+
+ public void InflateConstraints (Type declaring)
+ {
+ if (constraints != null)
+ gc = new InflatedConstraints (constraints, declaring);
+ }
+
+ public override bool IsClsComplianceRequired ()
+ {
+ return false;
+ }
+
+ protected class InflatedConstraints : GenericConstraints
+ {
+ GenericConstraints gc;
+ Type base_type;
+ Type class_constraint;
+ Type[] iface_constraints;
+ Type[] dargs;
+
+ public InflatedConstraints (GenericConstraints gc, Type declaring)
+ : this (gc, TypeManager.GetTypeArguments (declaring))
+ { }
+
+ public InflatedConstraints (GenericConstraints gc, Type[] dargs)
+ {
+ this.gc = gc;
+ this.dargs = dargs;
+
+ ArrayList list = new ArrayList ();
+ if (gc.HasClassConstraint)
+ list.Add (inflate (gc.ClassConstraint));
+ foreach (Type iface in gc.InterfaceConstraints)
+ list.Add (inflate (iface));
+
+ bool has_class_constr = false;
+ if (list.Count > 0) {
+ Type first = (Type) list [0];
+ has_class_constr = !first.IsGenericParameter && !first.IsInterface;
+ }
+
+ if ((list.Count > 0) && has_class_constr) {
+ class_constraint = (Type) list [0];
+ iface_constraints = new Type [list.Count - 1];
+ list.CopyTo (1, iface_constraints, 0, list.Count - 1);
+ } else {
+ iface_constraints = new Type [list.Count];
+ list.CopyTo (iface_constraints, 0);
+ }
+
+ if (HasValueTypeConstraint)
+ base_type = TypeManager.value_type;
+ else if (class_constraint != null)
+ base_type = class_constraint;
+ else
+ base_type = TypeManager.object_type;
+ }
+
+ Type inflate (Type t)
+ {
+ if (t == null)
+ return null;
+ if (t.IsGenericParameter)
+ return t.GenericParameterPosition < dargs.Length ? dargs [t.GenericParameterPosition] : t;
+ if (t.IsGenericType) {
+ Type[] args = t.GetGenericArguments ();
+ Type[] inflated = new Type [args.Length];
+
+ for (int i = 0; i < args.Length; i++)
+ inflated [i] = inflate (args [i]);
+
+ t = t.GetGenericTypeDefinition ();
+ t = t.MakeGenericType (inflated);
+ }
+
+ return t;
+ }
+
+ public override string TypeParameter {
+ get { return gc.TypeParameter; }
+ }
+
+ public override GenericParameterAttributes Attributes {
+ get { return gc.Attributes; }
+ }
+
+ public override Type ClassConstraint {
+ get { return class_constraint; }
+ }
+
+ public override Type EffectiveBaseClass {
+ get { return base_type; }
+ }
+
+ public override Type[] InterfaceConstraints {
+ get { return iface_constraints; }
+ }
+ }
+ }
+
+ /// <summary>
+ /// A TypeExpr which already resolved to a type parameter.
+ /// </summary>
+ public class TypeParameterExpr : TypeExpr {
+ TypeParameter type_parameter;
+
+ public TypeParameter TypeParameter {
+ get {
+ return type_parameter;
+ }
+ }
+
+ public TypeParameterExpr (TypeParameter type_parameter, Location loc)
+ {
+ this.type_parameter = type_parameter;
+ this.loc = loc;
+ }
+
+ protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
+ {
+ throw new NotSupportedException ();
+ }
+
+ public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
+ {
+ type = type_parameter.Type;
+ eclass = ExprClass.TypeParameter;
+ return this;
+ }
+
+ public override bool IsInterface {
+ get { return false; }
+ }
+
+ public override bool CheckAccessLevel (DeclSpace ds)
+ {
+ return true;
+ }
+ }
+
+ /// <summary>
+ /// Tracks the type arguments when instantiating a generic type. We're used in
+ /// ConstructedType.
+ /// </summary>
+ public class TypeArguments {
+ public readonly Location Location;
+ ArrayList args;
+ Type[] atypes;
+ int dimension;
+ bool has_type_args;
+
+ public TypeArguments (Location loc)
+ {
+ args = new ArrayList ();
+ this.Location = loc;
+ }
+
+ public TypeArguments (Location loc, params Expression[] types)
+ {
+ this.Location = loc;
+ this.args = new ArrayList (types);
+ }
+
+ public TypeArguments (int dimension, Location loc)
+ {
+ this.dimension = dimension;
+ this.Location = loc;
+ }
+
+ public void Add (Expression type)
+ {
+ args.Add (type);
+ }
+
+ public void Add (TypeArguments new_args)
+ {
+ args.AddRange (new_args.args);
+ }
+
+ /// <summary>
+ /// We're used during the parsing process: the parser can't distinguish
+ /// between type parameters and type arguments. Because of that, the
+ /// parser creates a `MemberName' with `TypeArguments' for both cases and
+ /// in case of a generic type definition, we call GetDeclarations().
+ /// </summary>
+ public TypeParameterName[] GetDeclarations ()
+ {
+ TypeParameterName[] ret = new TypeParameterName [args.Count];
+ for (int i = 0; i < args.Count; i++) {
+ TypeParameterName name = args [i] as TypeParameterName;
+ if (name != null) {
+ ret [i] = name;
+ continue;
+ }
+ SimpleName sn = args [i] as SimpleName;
+ if (sn != null && !sn.HasTypeArguments) {
+ ret [i] = new TypeParameterName (sn.Name, null, sn.Location);
+ continue;
+ }
+
+ Expression expr = (Expression) args [i];
+ // TODO: Wrong location
+ Report.Error (81, Location, "Type parameter declaration must be an identifier not a type");
+ ret [i] = new TypeParameterName (expr.GetSignatureForError (), null, expr.Location);
+ }
+ return ret;
+ }
+
+ /// <summary>
+ /// We may only be used after Resolve() is called and return the fully
+ /// resolved types.
+ /// </summary>
+ public Type[] Arguments {
+ get {
+ return atypes;
+ }
+ }
+
+ public bool HasTypeArguments {
+ get {
+ return has_type_args;
+ }
+ }
+
+ public int Count {
+ get {
+ if (dimension > 0)
+ return dimension;
+ else
+ return args.Count;
+ }
+ }
+
+ public bool IsUnbound {
+ get {
+ return dimension > 0;
+ }
+ }
+
+ public override string ToString ()
+ {
+ StringBuilder s = new StringBuilder ();
+
+ int count = Count;
+ for (int i = 0; i < count; i++){
+ //
+ // FIXME: Use TypeManager.CSharpname once we have the type
+ //
+ if (args != null)
+ s.Append (args [i].ToString ());
+ if (i+1 < count)
+ s.Append (",");
+ }
+ return s.ToString ();
+ }
+
+ public string GetSignatureForError()
+ {
+ StringBuilder sb = new StringBuilder();
+ for (int i = 0; i < Count; ++i)
+ {
+ Expression expr = (Expression)args [i];
+ sb.Append(expr.GetSignatureForError());
+ if (i + 1 < Count)
+ sb.Append(',');
+ }
+ return sb.ToString();
+ }
+
+ /// <summary>
+ /// Resolve the type arguments.
+ /// </summary>
+ public bool Resolve (IResolveContext ec)
+ {
+ int count = args.Count;
+ bool ok = true;
+
+ atypes = new Type [count];
+
+ for (int i = 0; i < count; i++){
+ TypeExpr te = ((Expression) args [i]).ResolveAsTypeTerminal (ec, false);
+ if (te == null) {
+ ok = false;
+ continue;
+ }
+
+ atypes[i] = te.Type;
+ if (te.Type.IsGenericParameter) {
+ if (te is TypeParameterExpr)
+ has_type_args = true;
+ continue;
+ }
+
+ if (te.Type.IsSealed && te.Type.IsAbstract) {
+ Report.Error (718, Location, "`{0}': static classes cannot be used as generic arguments",
+ te.GetSignatureForError ());
+ return false;
+ }
+
+ if (te.Type.IsPointer || TypeManager.IsSpecialType (te.Type)) {
+ Report.Error (306, Location,
+ "The type `{0}' may not be used as a type argument",
+ TypeManager.CSharpName (te.Type));
+ return false;
+ }
+
+ if (te.Type == TypeManager.void_type) {
+ Expression.Error_VoidInvalidInTheContext (Location);
+ return false;
+ }
+ }
+ return ok;
+ }
+
+ public TypeArguments Clone ()
+ {
+ TypeArguments copy = new TypeArguments (Location);
+ foreach (Expression ta in args)
+ copy.args.Add (ta);
+
+ return copy;
+ }
+ }
+
+ public class TypeParameterName : SimpleName
+ {
+ Attributes attributes;
+
+ public TypeParameterName (string name, Attributes attrs, Location loc)
+ : base (name, loc)
+ {
+ attributes = attrs;
+ }
+
+ public Attributes OptAttributes {
+ get {
+ return attributes;
+ }
+ }
+ }
+
+ /// <summary>
+ /// An instantiation of a generic type.
+ /// </summary>
+ public class ConstructedType : TypeExpr {
+ FullNamedExpression name;
+ TypeArguments args;
+ Type[] gen_params, atypes;
+ Type gt;
+
+ /// <summary>
+ /// Instantiate the generic type `fname' with the type arguments `args'.
+ /// </summary>
+ public ConstructedType (FullNamedExpression fname, TypeArguments args, Location l)
+ {
+ loc = l;
+ this.name = fname;
+ this.args = args;
+
+ eclass = ExprClass.Type;
+ }
+
+ /// <summary>
+ /// This is used to construct the `this' type inside a generic type definition.
+ /// </summary>
+ public ConstructedType (Type t, TypeParameter[] type_params, Location l)
+ {
+ gt = t.GetGenericTypeDefinition ();
+
+ args = new TypeArguments (l);
+ foreach (TypeParameter type_param in type_params)
+ args.Add (new TypeParameterExpr (type_param, l));
+
+ this.loc = l;
+ this.name = new TypeExpression (gt, l);
+ eclass = ExprClass.Type;
+ }
+
+ /// <summary>
+ /// Instantiate the generic type `t' with the type arguments `args'.
+ /// Use this constructor if you already know the fully resolved
+ /// generic type.
+ /// </summary>
+ public ConstructedType (Type t, TypeArguments args, Location l)
+ : this ((FullNamedExpression)null, args, l)
+ {
+ gt = t.GetGenericTypeDefinition ();
+ this.name = new TypeExpression (gt, l);
+ }
+
+ public TypeArguments TypeArguments {
+ get { return args; }
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpName (type);
+ }
+
+ protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
+ {
+ if (!ResolveConstructedType (ec))
+ return null;
+
+ return this;
+ }
+
+ /// <summary>
+ /// Check the constraints; we're called from ResolveAsTypeTerminal()
+ /// after fully resolving the constructed type.
+ /// </summary>
+ public bool CheckConstraints (IResolveContext ec)
+ {
+ return ConstraintChecker.CheckConstraints (ec, gt, gen_params, atypes, loc);
+ }
+
+ /// <summary>
+ /// Resolve the constructed type, but don't check the constraints.
+ /// </summary>
+ public bool ResolveConstructedType (IResolveContext ec)
+ {
+ if (type != null)
+ return true;
+ // If we already know the fully resolved generic type.
+ if (gt != null)
+ return DoResolveType (ec);
+
+ int num_args;
+ Type t = name.Type;
+
+ if (t == null) {
+ Report.Error (246, loc, "Cannot find type `{0}'<...>", GetSignatureForError ());
+ return false;
+ }
+
+ num_args = TypeManager.GetNumberOfTypeArguments (t);
+ if (num_args == 0) {
+ Report.Error (308, loc,
+ "The non-generic type `{0}' cannot " +
+ "be used with type arguments.",
+ TypeManager.CSharpName (t));
+ return false;
+ }
+
+ gt = t.GetGenericTypeDefinition ();
+ return DoResolveType (ec);
+ }
+
+ bool DoResolveType (IResolveContext ec)
+ {
+ //
+ // Resolve the arguments.
+ //
+ if (args.Resolve (ec) == false)
+ return false;
+
+ gen_params = gt.GetGenericArguments ();
+ atypes = args.Arguments;
+
+ if (atypes.Length != gen_params.Length) {
+ Report.Error (305, loc,
+ "Using the generic type `{0}' " +
+ "requires {1} type arguments",
+ TypeManager.CSharpName (gt),
+ gen_params.Length.ToString ());
+ return false;
+ }
+
+ //
+ // Now bind the parameters.
+ //
+ type = gt.MakeGenericType (atypes);
+ return true;
+ }
+
+ public Expression GetSimpleName (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override bool CheckAccessLevel (DeclSpace ds)
+ {
+ return ds.CheckAccessLevel (gt);
+ }
+
+ public override bool AsAccessible (DeclSpace ds)
+ {
+ foreach (Type t in atypes) {
+ if (!ds.IsAccessibleAs (t))
+ return false;
+ }
+
+ return ds.IsAccessibleAs (gt);
+ }
+
+ public override bool IsClass {
+ get { return gt.IsClass; }
+ }
+
+ public override bool IsValueType {
+ get { return gt.IsValueType; }
+ }
+
+ public override bool IsInterface {
+ get { return gt.IsInterface; }
+ }
+
+ public override bool IsSealed {
+ get { return gt.IsSealed; }
+ }
+
+ public override bool Equals (object obj)
+ {
+ ConstructedType cobj = obj as ConstructedType;
+ if (cobj == null)
+ return false;
+
+ if ((type == null) || (cobj.type == null))
+ return false;
+
+ return type == cobj.type;
+ }
+
+ public override int GetHashCode ()
+ {
+ return base.GetHashCode ();
+ }
+ }
+
+ public abstract class ConstraintChecker
+ {
+ protected readonly Type[] gen_params;
+ protected readonly Type[] atypes;
+ protected readonly Location loc;
+
+ protected ConstraintChecker (Type[] gen_params, Type[] atypes, Location loc)
+ {
+ this.gen_params = gen_params;
+ this.atypes = atypes;
+ this.loc = loc;
+ }
+
+ /// <summary>
+ /// Check the constraints; we're called from ResolveAsTypeTerminal()
+ /// after fully resolving the constructed type.
+ /// </summary>
+ public bool CheckConstraints (IResolveContext ec)
+ {
+ for (int i = 0; i < gen_params.Length; i++) {
+ if (!CheckConstraints (ec, i))
+ return false;
+ }
+
+ return true;
+ }
+
+ protected bool CheckConstraints (IResolveContext ec, int index)
+ {
+ Type atype = atypes [index];
+ Type ptype = gen_params [index];
+
+ if (atype == ptype)
+ return true;
+
+ Expression aexpr = new EmptyExpression (atype);
+
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (ptype);
+ if (gc == null)
+ return true;
+
+ bool is_class, is_struct;
+ if (atype.IsGenericParameter) {
+ GenericConstraints agc = TypeManager.GetTypeParameterConstraints (atype);
+ if (agc != null) {
+ if (agc is Constraints)
+ ((Constraints) agc).Resolve (ec);
+ is_class = agc.IsReferenceType;
+ is_struct = agc.IsValueType;
+ } else {
+ is_class = is_struct = false;
+ }
+ } else {
+#if MS_COMPATIBLE
+ is_class = false;
+ if (!atype.IsGenericType)
+#endif
+ is_class = atype.IsClass || atype.IsInterface;
+ is_struct = atype.IsValueType && !TypeManager.IsNullableType (atype);
+ }
+
+ //
+ // First, check the `class' and `struct' constraints.
+ //
+ if (gc.HasReferenceTypeConstraint && !is_class) {
+ Report.Error (452, loc, "The type `{0}' must be " +
+ "a reference type in order to use it " +
+ "as type parameter `{1}' in the " +
+ "generic type or method `{2}'.",
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
+ return false;
+ } else if (gc.HasValueTypeConstraint && !is_struct) {
+ Report.Error (453, loc, "The type `{0}' must be a " +
+ "non-nullable value type in order to use it " +
+ "as type parameter `{1}' in the " +
+ "generic type or method `{2}'.",
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
+ return false;
+ }
+
+ //
+ // The class constraint comes next.
+ //
+ if (gc.HasClassConstraint) {
+ if (!CheckConstraint (ec, ptype, aexpr, gc.ClassConstraint))
+ return false;
+ }
+
+ //
+ // Now, check the interface constraints.
+ //
+ if (gc.InterfaceConstraints != null) {
+ foreach (Type it in gc.InterfaceConstraints) {
+ if (!CheckConstraint (ec, ptype, aexpr, it))
+ return false;
+ }
+ }
+
+ //
+ // Finally, check the constructor constraint.
+ //
+
+ if (!gc.HasConstructorConstraint)
+ return true;
+
+ if (TypeManager.IsBuiltinType (atype) || atype.IsValueType)
+ return true;
+
+ if (HasDefaultConstructor (atype))
+ return true;
+
+ Report_SymbolRelatedToPreviousError ();
+ Report.SymbolRelatedToPreviousError (atype);
+ Report.Error (310, loc, "The type `{0}' must have a public " +
+ "parameterless constructor in order to use it " +
+ "as parameter `{1}' in the generic type or " +
+ "method `{2}'",
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
+ return false;
+ }
+
+ protected bool CheckConstraint (IResolveContext ec, Type ptype, Expression expr,
+ Type ctype)
+ {
+ if (TypeManager.HasGenericArguments (ctype)) {
+ Type[] types = TypeManager.GetTypeArguments (ctype);
+
+ TypeArguments new_args = new TypeArguments (loc);
+
+ for (int i = 0; i < types.Length; i++) {
+ Type t = types [i];
+
+ if (t.IsGenericParameter) {
+ int pos = t.GenericParameterPosition;
+ t = atypes [pos];
+ }
+ new_args.Add (new TypeExpression (t, loc));
+ }
+
+ TypeExpr ct = new ConstructedType (ctype, new_args, loc);
+ if (ct.ResolveAsTypeStep (ec, false) == null)
+ return false;
+ ctype = ct.Type;
+ } else if (ctype.IsGenericParameter) {
+ int pos = ctype.GenericParameterPosition;
+ ctype = atypes [pos];
+ }
+
+ if (Convert.ImplicitStandardConversionExists (expr, ctype))
+ return true;
+
+ Report_SymbolRelatedToPreviousError ();
+ Report.SymbolRelatedToPreviousError (expr.Type);
+
+ if (TypeManager.IsNullableType (expr.Type) && ctype.IsInterface) {
+ Report.Error (313, loc,
+ "The type `{0}' cannot be used as type parameter `{1}' in the generic type or method `{2}'. " +
+ "The nullable type `{0}' never satisfies interface constraint of type `{3}'",
+ TypeManager.CSharpName (expr.Type), TypeManager.CSharpName (ptype),
+ GetSignatureForError (), TypeManager.CSharpName (ctype));
+ } else {
+ Report.Error (309, loc,
+ "The type `{0}' must be convertible to `{1}' in order to " +
+ "use it as parameter `{2}' in the generic type or method `{3}'",
+ TypeManager.CSharpName (expr.Type), TypeManager.CSharpName (ctype),
+ TypeManager.CSharpName (ptype), GetSignatureForError ());
+ }
+ return false;
+ }
+
+ static bool HasDefaultConstructor (Type atype)
+ {
+ TypeParameter tparam = TypeManager.LookupTypeParameter (atype);
+ if (tparam != null) {
+ if (tparam.GenericConstraints == null)
+ return false;
+
+ return tparam.GenericConstraints.HasConstructorConstraint ||
+ tparam.GenericConstraints.HasValueTypeConstraint;
+ }
- public string GetSignatureForError ()
+ if (atype.IsAbstract)
+ return false;
+
+ again:
+ atype = TypeManager.DropGenericTypeArguments (atype);
+ if (atype is TypeBuilder) {
+ TypeContainer tc = TypeManager.LookupTypeContainer (atype);
+ if (tc.InstanceConstructors == null) {
+ atype = atype.BaseType;
+ goto again;
+ }
+
+ foreach (Constructor c in tc.InstanceConstructors) {
+ if ((c.ModFlags & Modifiers.PUBLIC) == 0)
+ continue;
+ if ((c.Parameters.FixedParameters != null) &&
+ (c.Parameters.FixedParameters.Length != 0))
+ continue;
+ if (c.Parameters.HasArglist || c.Parameters.HasParams)
+ continue;
+
+ return true;
+ }
+ }
+
+ MemberInfo [] list = TypeManager.MemberLookup (null, null, atype, MemberTypes.Constructor,
+ BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
+ ConstructorInfo.ConstructorName, null);
+
+ if (list == null)
+ return false;
+
+ foreach (MethodBase mb in list) {
+ AParametersCollection pd = TypeManager.GetParameterData (mb);
+ if (pd.Count == 0)
+ return true;
+ }
+
+ return false;
+ }
+
+ protected abstract string GetSignatureForError ();
+ protected abstract void Report_SymbolRelatedToPreviousError ();
+
+ public static bool CheckConstraints (EmitContext ec, MethodBase definition,
+ MethodBase instantiated, Location loc)
+ {
+ MethodConstraintChecker checker = new MethodConstraintChecker (
+ definition, definition.GetGenericArguments (),
+ instantiated.GetGenericArguments (), loc);
+
+ return checker.CheckConstraints (ec);
+ }
+
+ public static bool CheckConstraints (IResolveContext ec, Type gt, Type[] gen_params,
+ Type[] atypes, Location loc)
+ {
+ TypeConstraintChecker checker = new TypeConstraintChecker (
+ gt, gen_params, atypes, loc);
+
+ return checker.CheckConstraints (ec);
+ }
+
+ protected class MethodConstraintChecker : ConstraintChecker
+ {
+ MethodBase definition;
+
+ public MethodConstraintChecker (MethodBase definition, Type[] gen_params,
+ Type[] atypes, Location loc)
+ : base (gen_params, atypes, loc)
+ {
+ this.definition = definition;
+ }
+
+ protected override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpSignature (definition);
+ }
+
+ protected override void Report_SymbolRelatedToPreviousError ()
+ {
+ Report.SymbolRelatedToPreviousError (definition);
+ }
+ }
+
+ protected class TypeConstraintChecker : ConstraintChecker
+ {
+ Type gt;
+
+ public TypeConstraintChecker (Type gt, Type[] gen_params, Type[] atypes,
+ Location loc)
+ : base (gen_params, atypes, loc)
+ {
+ this.gt = gt;
+ }
+
+ protected override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpName (gt);
+ }
+
+ protected override void Report_SymbolRelatedToPreviousError ()
+ {
+ Report.SymbolRelatedToPreviousError (gt);
+ }
+ }
+ }
+
+ /// <summary>
+ /// A generic method definition.
+ /// </summary>
+ public class GenericMethod : DeclSpace
+ {
+ FullNamedExpression return_type;
+ Parameters parameters;
+
+ public GenericMethod (NamespaceEntry ns, DeclSpace parent, MemberName name,
+ FullNamedExpression return_type, Parameters parameters)
+ : base (ns, parent, name, null)
+ {
+ this.return_type = return_type;
+ this.parameters = parameters;
+ }
+
+ public override TypeBuilder DefineType ()
+ {
+ throw new Exception ();
+ }
+
+ public override bool Define ()
+ {
+ for (int i = 0; i < TypeParameters.Length; i++)
+ if (!TypeParameters [i].Resolve (this))
+ return false;
+
+ return true;
+ }
+
+ /// <summary>
+ /// Define and resolve the type parameters.
+ /// We're called from Method.Define().
+ /// </summary>
+ public bool Define (MethodBuilder mb)
+ {
+ TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
+ string[] snames = new string [names.Length];
+ for (int i = 0; i < names.Length; i++) {
+ string type_argument_name = names[i].Name;
+ Parameter p = parameters.GetParameterByName (type_argument_name);
+ if (p != null) {
+ Error_ParameterNameCollision (p.Location, type_argument_name, "method parameter");
+ return false;
+ }
+
+ snames[i] = type_argument_name;
+ }
+
+ GenericTypeParameterBuilder[] gen_params = mb.DefineGenericParameters (snames);
+ for (int i = 0; i < TypeParameters.Length; i++)
+ TypeParameters [i].Define (gen_params [i]);
+
+ if (!Define ())
+ return false;
+
+ for (int i = 0; i < TypeParameters.Length; i++) {
+ if (!TypeParameters [i].ResolveType (this))
+ return false;
+ }
+
+ return true;
+ }
+
+ internal static void Error_ParameterNameCollision (Location loc, string name, string collisionWith)
+ {
+ Report.Error (412, loc, "The type parameter name `{0}' is the same as `{1}'",
+ name, collisionWith);
+ }
+
+ /// <summary>
+ /// We're called from MethodData.Define() after creating the MethodBuilder.
+ /// </summary>
+ public bool DefineType (EmitContext ec, MethodBuilder mb,
+ MethodInfo implementing, bool is_override)
+ {
+ for (int i = 0; i < TypeParameters.Length; i++)
+ if (!TypeParameters [i].DefineType (
+ ec, mb, implementing, is_override))
+ return false;
+
+ bool ok = parameters.Resolve (ec);
+
+ if ((return_type != null) && (return_type.ResolveAsTypeTerminal (ec, false) == null))
+ ok = false;
+
+ return ok;
+ }
+
+ public void EmitAttributes ()
+ {
+ for (int i = 0; i < TypeParameters.Length; i++)
+ TypeParameters [i].Emit ();
+
+ if (OptAttributes != null)
+ OptAttributes.Emit ();
+ }
+
+ public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
+ MemberFilter filter, object criteria)
+ {
+ throw new Exception ();
+ }
+
+ public override MemberCache MemberCache {
+ get {
+ return null;
+ }
+ }
+
+ public override AttributeTargets AttributeTargets {
+ get {
+ return AttributeTargets.Method | AttributeTargets.ReturnValue;
+ }
+ }
+
+ public override string DocCommentHeader {
+ get { return "M:"; }
+ }
+
+ public new void VerifyClsCompliance ()
+ {
+ foreach (TypeParameter tp in TypeParameters) {
+ if (tp.Constraints == null)
+ continue;
+
+ tp.Constraints.VerifyClsCompliance ();
+ }
+ }
+ }
+
+ public partial class TypeManager
+ {
+ static public Type activator_type;
+
+ public static TypeContainer LookupGenericTypeContainer (Type t)
+ {
+ t = DropGenericTypeArguments (t);
+ return LookupTypeContainer (t);
+ }
+
+ /// <summary>
+ /// Check whether `a' and `b' may become equal generic types.
+ /// The algorithm to do that is a little bit complicated.
+ /// </summary>
+ public static bool MayBecomeEqualGenericTypes (Type a, Type b, Type[] class_inferred,
+ Type[] method_inferred)
+ {
+ if (a.IsGenericParameter) {
+ //
+ // If a is an array of a's type, they may never
+ // become equal.
+ //
+ while (b.IsArray) {
+ b = b.GetElementType ();
+ if (a.Equals (b))
+ return false;
+ }
+
+ //
+ // If b is a generic parameter or an actual type,
+ // they may become equal:
+ //
+ // class X<T,U> : I<T>, I<U>
+ // class X<T> : I<T>, I<float>
+ //
+ if (b.IsGenericParameter || !b.IsGenericType) {
+ int pos = a.GenericParameterPosition;
+ Type[] args = a.DeclaringMethod != null ? method_inferred : class_inferred;
+ if (args [pos] == null) {
+ args [pos] = b;
+ return true;
+ }
+
+ return args [pos] == a;
+ }
+
+ //
+ // We're now comparing a type parameter with a
+ // generic instance. They may become equal unless
+ // the type parameter appears anywhere in the
+ // generic instance:
+ //
+ // class X<T,U> : I<T>, I<X<U>>
+ // -> error because you could instanciate it as
+ // X<X<int>,int>
+ //
+ // class X<T> : I<T>, I<X<T>> -> ok
+ //
+
+ Type[] bargs = GetTypeArguments (b);
+ for (int i = 0; i < bargs.Length; i++) {
+ if (a.Equals (bargs [i]))
+ return false;
+ }
+
+ return true;
+ }
+
+ if (b.IsGenericParameter)
+ return MayBecomeEqualGenericTypes (b, a, class_inferred, method_inferred);
+
+ //
+ // At this point, neither a nor b are a type parameter.
+ //
+ // If one of them is a generic instance, let
+ // MayBecomeEqualGenericInstances() compare them (if the
+ // other one is not a generic instance, they can never
+ // become equal).
+ //
+
+ if (a.IsGenericType || b.IsGenericType)
+ return MayBecomeEqualGenericInstances (a, b, class_inferred, method_inferred);
+
+ //
+ // If both of them are arrays.
+ //
+
+ if (a.IsArray && b.IsArray) {
+ if (a.GetArrayRank () != b.GetArrayRank ())
+ return false;
+
+ a = a.GetElementType ();
+ b = b.GetElementType ();
+
+ return MayBecomeEqualGenericTypes (a, b, class_inferred, method_inferred);
+ }
+
+ //
+ // Ok, two ordinary types.
+ //
+
+ return a.Equals (b);
+ }
+
+ //
+ // Checks whether two generic instances may become equal for some
+ // particular instantiation (26.3.1).
+ //
+ public static bool MayBecomeEqualGenericInstances (Type a, Type b,
+ Type[] class_inferred,
+ Type[] method_inferred)
+ {
+ if (!a.IsGenericType || !b.IsGenericType)
+ return false;
+ if (a.GetGenericTypeDefinition () != b.GetGenericTypeDefinition ())
+ return false;
+
+ return MayBecomeEqualGenericInstances (
+ GetTypeArguments (a), GetTypeArguments (b), class_inferred, method_inferred);
+ }
+
+ public static bool MayBecomeEqualGenericInstances (Type[] aargs, Type[] bargs,
+ Type[] class_inferred,
+ Type[] method_inferred)
+ {
+ if (aargs.Length != bargs.Length)
+ return false;
+
+ for (int i = 0; i < aargs.Length; i++) {
+ if (!MayBecomeEqualGenericTypes (aargs [i], bargs [i], class_inferred, method_inferred))
+ return false;
+ }
+
+ return true;
+ }
+
+ /// <summary>
+ /// Type inference. Try to infer the type arguments from `method',
+ /// which is invoked with the arguments `arguments'. This is used
+ /// when resolving an Invocation or a DelegateInvocation and the user
+ /// did not explicitly specify type arguments.
+ /// </summary>
+ public static int InferTypeArguments (EmitContext ec,
+ ArrayList arguments,
+ ref MethodBase method)
+ {
+ ATypeInference ti = ATypeInference.CreateInstance (arguments);
+ Type[] i_args = ti.InferMethodArguments (ec, method);
+ if (i_args == null)
+ return ti.InferenceScore;
+
+ if (i_args.Length == 0)
+ return 0;
+
+ method = ((MethodInfo) method).MakeGenericMethod (i_args);
+ return 0;
+ }
+
+ /// <summary>
+ /// Type inference.
+ /// </summary>
+ public static bool InferTypeArguments (AParametersCollection apd,
+ ref MethodBase method)
+ {
+ if (!TypeManager.IsGenericMethod (method))
+ return true;
+
+ ATypeInference ti = ATypeInference.CreateInstance (ArrayList.Adapter (apd.Types));
+ Type[] i_args = ti.InferDelegateArguments (method);
+ if (i_args == null)
+ return false;
+
+ method = ((MethodInfo) method).MakeGenericMethod (i_args);
+ return true;
+ }
+ }
+
+ abstract class ATypeInference
+ {
+ protected readonly ArrayList arguments;
+ protected readonly int arg_count;
+
+ protected ATypeInference (ArrayList arguments)
+ {
+ this.arguments = arguments;
+ if (arguments != null)
+ arg_count = arguments.Count;
+ }
+
+ public static ATypeInference CreateInstance (ArrayList arguments)
+ {
+ if (RootContext.Version == LanguageVersion.ISO_2)
+ return new TypeInferenceV2 (arguments);
+
+ return new TypeInferenceV3 (arguments);
+ }
+
+ public virtual int InferenceScore {
+ get {
+ return int.MaxValue;
+ }
+ }
+
+ public abstract Type[] InferMethodArguments (EmitContext ec, MethodBase method);
+ public abstract Type[] InferDelegateArguments (MethodBase method);
+ }
+
+ //
+ // Implements C# 2.0 type inference
+ //
+ class TypeInferenceV2 : ATypeInference
+ {
+ public TypeInferenceV2 (ArrayList arguments)
+ : base (arguments)
+ {
+ }
+
+ public override Type[] InferDelegateArguments (MethodBase method)
+ {
+ AParametersCollection pd = TypeManager.GetParameterData (method);
+ if (arg_count != pd.Count)
+ return null;
+
+ Type[] method_args = method.GetGenericArguments ();
+ Type[] inferred_types = new Type[method_args.Length];
+
+ Type[] param_types = new Type[pd.Count];
+ Type[] arg_types = (Type[])arguments.ToArray (typeof (Type));
+
+ for (int i = 0; i < arg_count; i++) {
+ param_types[i] = pd.Types [i];
+ }
+
+ if (!InferTypeArguments (param_types, arg_types, inferred_types))
+ return null;
+
+ return inferred_types;
+ }
+
+ public override Type[] InferMethodArguments (EmitContext ec, MethodBase method)
{
- throw new NotImplementedException ();
+ AParametersCollection pd = TypeManager.GetParameterData (method);
+ Type[] method_generic_args = method.GetGenericArguments ();
+ Type [] inferred_types = new Type [method_generic_args.Length];
+ Type[] arg_types = new Type [pd.Count];
+
+ int a_count = arg_types.Length;
+ if (pd.HasParams)
+ --a_count;
+
+ for (int i = 0; i < a_count; i++) {
+ Argument a = (Argument) arguments[i];
+ if (a.Expr is NullLiteral || a.Expr is MethodGroupExpr || a.Expr is AnonymousMethodExpression)
+ continue;
+
+ if (!TypeInferenceV2.UnifyType (pd.Types [i], a.Type, inferred_types))
+ return null;
+ }
+
+ if (pd.HasParams) {
+ Type element_type = TypeManager.GetElementType (pd.Types [a_count]);
+ for (int i = a_count; i < arg_count; i++) {
+ Argument a = (Argument) arguments [i];
+ if (a.Expr is NullLiteral || a.Expr is MethodGroupExpr || a.Expr is AnonymousMethodExpression)
+ continue;
+
+ if (!TypeInferenceV2.UnifyType (element_type, a.Type, inferred_types))
+ return null;
+ }
+ }
+
+ for (int i = 0; i < inferred_types.Length; i++)
+ if (inferred_types [i] == null)
+ return null;
+
+ return inferred_types;
}
- public TypeArguments Clone ()
+ static bool InferTypeArguments (Type[] param_types, Type[] arg_types,
+ Type[] inferred_types)
+ {
+ for (int i = 0; i < arg_types.Length; i++) {
+ if (arg_types[i] == null)
+ continue;
+
+ if (!UnifyType (param_types[i], arg_types[i], inferred_types))
+ return false;
+ }
+
+ for (int i = 0; i < inferred_types.Length; ++i)
+ if (inferred_types[i] == null)
+ return false;
+
+ return true;
+ }
+
+ public static bool UnifyType (Type pt, Type at, Type[] inferred)
+ {
+ if (pt.IsGenericParameter) {
+ if (pt.DeclaringMethod == null)
+ return pt == at;
+
+ int pos = pt.GenericParameterPosition;
+
+ if (inferred [pos] == null)
+ inferred [pos] = at;
+
+ return inferred [pos] == at;
+ }
+
+ if (!pt.ContainsGenericParameters) {
+ if (at.ContainsGenericParameters)
+ return UnifyType (at, pt, inferred);
+ else
+ return true;
+ }
+
+ if (at.IsArray) {
+ if (pt.IsArray) {
+ if (at.GetArrayRank () != pt.GetArrayRank ())
+ return false;
+
+ return UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
+ }
+
+ if (!pt.IsGenericType)
+ return false;
+
+ Type gt = pt.GetGenericTypeDefinition ();
+ if ((gt != TypeManager.generic_ilist_type) && (gt != TypeManager.generic_icollection_type) &&
+ (gt != TypeManager.generic_ienumerable_type))
+ return false;
+
+ Type[] args = TypeManager.GetTypeArguments (pt);
+ return UnifyType (args[0], at.GetElementType (), inferred);
+ }
+
+ if (pt.IsArray) {
+ if (!at.IsArray ||
+ (pt.GetArrayRank () != at.GetArrayRank ()))
+ return false;
+
+ return UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
+ }
+
+ if (pt.IsByRef && at.IsByRef)
+ return UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
+ ArrayList list = new ArrayList ();
+ if (at.IsGenericType)
+ list.Add (at);
+ for (Type bt = at.BaseType; bt != null; bt = bt.BaseType)
+ list.Add (bt);
+
+ list.AddRange (TypeManager.GetInterfaces (at));
+
+ foreach (Type type in list) {
+ if (!type.IsGenericType)
+ continue;
+
+ if (TypeManager.DropGenericTypeArguments (pt) != TypeManager.DropGenericTypeArguments (type))
+ continue;
+
+ if (!UnifyTypes (pt.GetGenericArguments (), type.GetGenericArguments (), inferred))
+ return false;
+ }
+
+ return true;
+ }
+
+ static bool UnifyTypes (Type[] pts, Type[] ats, Type[] inferred)
+ {
+ for (int i = 0; i < ats.Length; i++) {
+ if (!UnifyType (pts [i], ats [i], inferred))
+ return false;
+ }
+ return true;
+ }
+ }
+
+ //
+ // Implements C# 3.0 type inference
+ //
+ class TypeInferenceV3 : ATypeInference
+ {
+ //
+ // Tracks successful rate of type inference
+ //
+ int score = int.MaxValue;
+
+ public TypeInferenceV3 (ArrayList arguments)
+ : base (arguments)
+ {
+ }
+
+ public override int InferenceScore {
+ get {
+ return score;
+ }
+ }
+
+ public override Type[] InferDelegateArguments (MethodBase method)
+ {
+ AParametersCollection pd = TypeManager.GetParameterData (method);
+ if (arg_count != pd.Count)
+ return null;
+
+ Type[] d_gargs = method.GetGenericArguments ();
+ TypeInferenceContext context = new TypeInferenceContext (d_gargs);
+
+ // A lower-bound inference is made from each argument type Uj of D
+ // to the corresponding parameter type Tj of M
+ for (int i = 0; i < arg_count; ++i) {
+ Type t = pd.Types [i];
+ if (!t.IsGenericParameter)
+ continue;
+
+ context.LowerBoundInference ((Type)arguments[i], t);
+ }
+
+ if (!context.FixAllTypes ())
+ return null;
+
+ return context.InferredTypeArguments;
+ }
+
+ public override Type[] InferMethodArguments (EmitContext ec, MethodBase method)
+ {
+ Type[] method_generic_args = method.GetGenericArguments ();
+ TypeInferenceContext context = new TypeInferenceContext (method_generic_args);
+ if (!context.UnfixedVariableExists)
+ return Type.EmptyTypes;
+
+ AParametersCollection pd = TypeManager.GetParameterData (method);
+ if (!InferInPhases (ec, context, pd))
+ return null;
+
+ return context.InferredTypeArguments;
+ }
+
+ //
+ // Implements method type arguments inference
+ //
+ bool InferInPhases (EmitContext ec, TypeInferenceContext tic, AParametersCollection methodParameters)
+ {
+ int params_arguments_start;
+ if (methodParameters.HasParams) {
+ params_arguments_start = methodParameters.Count - 1;
+ } else {
+ params_arguments_start = arg_count;
+ }
+
+ Type [] ptypes = methodParameters.Types;
+
+ //
+ // The first inference phase
+ //
+ Type method_parameter = null;
+ for (int i = 0; i < arg_count; i++) {
+ Argument a = (Argument) arguments [i];
+
+ if (i < params_arguments_start) {
+ method_parameter = methodParameters.Types [i];
+ } else if (i == params_arguments_start) {
+ if (arg_count == params_arguments_start + 1 && TypeManager.HasElementType (a.Type))
+ method_parameter = methodParameters.Types [params_arguments_start];
+ else
+ method_parameter = TypeManager.GetElementType (methodParameters.Types [params_arguments_start]);
+
+ ptypes = (Type[]) ptypes.Clone ();
+ ptypes [i] = method_parameter;
+ }
+
+ //
+ // When a lambda expression, an anonymous method
+ // is used an explicit argument type inference takes a place
+ //
+ AnonymousMethodExpression am = a.Expr as AnonymousMethodExpression;
+ if (am != null) {
+ if (am.ExplicitTypeInference (tic, method_parameter))
+ --score;
+ continue;
+ }
+
+ if (a.Expr is NullLiteral)
+ continue;
+
+ //
+ // Otherwise an output type inference is made
+ //
+ score -= tic.OutputTypeInference (ec, a.Expr, method_parameter);
+ }
+
+ //
+ // Part of the second phase but because it happens only once
+ // we don't need to call it in cycle
+ //
+ bool fixed_any = false;
+ if (!tic.FixIndependentTypeArguments (ptypes, ref fixed_any))
+ return false;
+
+ return DoSecondPhase (ec, tic, ptypes, !fixed_any);
+ }
+
+ bool DoSecondPhase (EmitContext ec, TypeInferenceContext tic, Type[] methodParameters, bool fixDependent)
{
- throw new NotImplementedException ();
+ bool fixed_any = false;
+ if (fixDependent && !tic.FixDependentTypes (ref fixed_any))
+ return false;
+
+ // If no further unfixed type variables exist, type inference succeeds
+ if (!tic.UnfixedVariableExists)
+ return true;
+
+ if (!fixed_any && fixDependent)
+ return false;
+
+ // For all arguments where the corresponding argument output types
+ // contain unfixed type variables but the input types do not,
+ // an output type inference is made
+ for (int i = 0; i < arg_count; i++) {
+
+ // Align params arguments
+ Type t_i = methodParameters [i >= methodParameters.Length ? methodParameters.Length - 1: i];
+
+ if (!TypeManager.IsDelegateType (t_i)) {
+ if (TypeManager.DropGenericTypeArguments (t_i) != TypeManager.expression_type)
+ continue;
+
+ t_i = t_i.GetGenericArguments () [0];
+ }
+
+ MethodInfo mi = Delegate.GetInvokeMethod (t_i, t_i);
+ Type rtype = mi.ReturnType;
+
+#if MS_COMPATIBLE
+ // Blablabla, because reflection does not work with dynamic types
+ Type[] g_args = t_i.GetGenericArguments ();
+ rtype = g_args[rtype.GenericParameterPosition];
+#endif
+
+ if (tic.IsReturnTypeNonDependent (mi, rtype))
+ score -= tic.OutputTypeInference (ec, ((Argument) arguments [i]).Expr, t_i);
+ }
+
+
+ return DoSecondPhase (ec, tic, methodParameters, true);
}
}
public class TypeInferenceContext
{
- public void ExactInference (Type u, Type v)
+ readonly Type[] unfixed_types;
+ readonly Type[] fixed_types;
+ readonly ArrayList[] bounds;
+ bool failed;
+
+ public TypeInferenceContext (Type[] typeArguments)
+ {
+ if (typeArguments.Length == 0)
+ throw new ArgumentException ("Empty generic arguments");
+
+ fixed_types = new Type [typeArguments.Length];
+ for (int i = 0; i < typeArguments.Length; ++i) {
+ if (typeArguments [i].IsGenericParameter) {
+ if (bounds == null) {
+ bounds = new ArrayList [typeArguments.Length];
+ unfixed_types = new Type [typeArguments.Length];
+ }
+ unfixed_types [i] = typeArguments [i];
+ } else {
+ fixed_types [i] = typeArguments [i];
+ }
+ }
+ }
+
+ public Type[] InferredTypeArguments {
+ get {
+ return fixed_types;
+ }
+ }
+
+ void AddToBounds (Type t, int index)
+ {
+ //
+ // Some types cannot be used as type arguments
+ //
+ if (t == TypeManager.void_type || t.IsPointer)
+ return;
+
+ ArrayList a = bounds [index];
+ if (a == null) {
+ a = new ArrayList ();
+ bounds [index] = a;
+ } else {
+ if (a.Contains (t))
+ return;
+ }
+
+ //
+ // SPEC: does not cover type inference using constraints
+ //
+ //if (TypeManager.IsGenericParameter (t)) {
+ // GenericConstraints constraints = TypeManager.GetTypeParameterConstraints (t);
+ // if (constraints != null) {
+ // //if (constraints.EffectiveBaseClass != null)
+ // // t = constraints.EffectiveBaseClass;
+ // }
+ //}
+ a.Add (t);
+ }
+
+ bool AllTypesAreFixed (Type[] types)
+ {
+ foreach (Type t in types) {
+ if (t.IsGenericParameter) {
+ if (!IsFixed (t))
+ return false;
+ continue;
+ }
+
+ if (t.IsGenericType)
+ return AllTypesAreFixed (t.GetGenericArguments ());
+ }
+
+ return true;
+ }
+
+ //
+ // 26.3.3.8 Exact Inference
+ //
+ public int ExactInference (Type u, Type v)
+ {
+ // If V is an array type
+ if (v.IsArray) {
+ if (!u.IsArray)
+ return 0;
+
+ if (u.GetArrayRank () != v.GetArrayRank ())
+ return 0;
+
+ return ExactInference (TypeManager.GetElementType (u), TypeManager.GetElementType (v));
+ }
+
+ // If V is constructed type and U is constructed type
+ if (v.IsGenericType && !v.IsGenericTypeDefinition) {
+ if (!u.IsGenericType)
+ return 0;
+
+ Type [] ga_u = u.GetGenericArguments ();
+ Type [] ga_v = v.GetGenericArguments ();
+ if (ga_u.Length != ga_v.Length)
+ return 0;
+
+ int score = 0;
+ for (int i = 0; i < ga_u.Length; ++i)
+ score += ExactInference (ga_u [i], ga_v [i]);
+
+ return score > 0 ? 1 : 0;
+ }
+
+ // If V is one of the unfixed type arguments
+ int pos = IsUnfixed (v);
+ if (pos == -1)
+ return 0;
+
+ AddToBounds (u, pos);
+ return 1;
+ }
+
+ public bool FixAllTypes ()
+ {
+ for (int i = 0; i < unfixed_types.Length; ++i) {
+ if (!FixType (i))
+ return false;
+ }
+ return true;
+ }
+
+ //
+ // All unfixed type variables Xi are fixed for which all of the following hold:
+ // a, There is at least one type variable Xj that depends on Xi
+ // b, Xi has a non-empty set of bounds
+ //
+ public bool FixDependentTypes (ref bool fixed_any)
+ {
+ for (int i = 0; i < unfixed_types.Length; ++i) {
+ if (unfixed_types[i] == null)
+ continue;
+
+ if (bounds[i] == null)
+ continue;
+
+ if (!FixType (i))
+ return false;
+
+ fixed_any = true;
+ }
+
+ return true;
+ }
+
+ //
+ // All unfixed type variables Xi which depend on no Xj are fixed
+ //
+ public bool FixIndependentTypeArguments (Type[] methodParameters, ref bool fixed_any)
+ {
+ ArrayList types_to_fix = new ArrayList (unfixed_types);
+ for (int i = 0; i < methodParameters.Length; ++i) {
+ Type t = methodParameters[i];
+ if (t.IsGenericParameter)
+ continue;
+
+ if (!TypeManager.IsDelegateType (t)) {
+ if (TypeManager.DropGenericTypeArguments (t) != TypeManager.expression_type)
+ continue;
+
+ t = t.GetGenericArguments () [0];
+ }
+
+ MethodInfo invoke = Delegate.GetInvokeMethod (t, t);
+ Type rtype = invoke.ReturnType;
+ if (!rtype.IsGenericParameter && !rtype.IsGenericType)
+ continue;
+
+#if MS_COMPATIBLE
+ // Blablabla, because reflection does not work with dynamic types
+ if (rtype.IsGenericParameter) {
+ Type [] g_args = t.GetGenericArguments ();
+ rtype = g_args [rtype.GenericParameterPosition];
+ }
+#endif
+ // Remove dependent types, they cannot be fixed yet
+ RemoveDependentTypes (types_to_fix, rtype);
+ }
+
+ foreach (Type t in types_to_fix) {
+ if (t == null)
+ continue;
+
+ int idx = IsUnfixed (t);
+ if (idx >= 0 && !FixType (idx)) {
+ return false;
+ }
+ }
+
+ fixed_any = types_to_fix.Count > 0;
+ return true;
+ }
+
+ //
+ // 26.3.3.10 Fixing
+ //
+ public bool FixType (int i)
+ {
+ // It's already fixed
+ if (unfixed_types[i] == null)
+ throw new InternalErrorException ("Type argument has been already fixed");
+
+ if (failed)
+ return false;
+
+ ArrayList candidates = (ArrayList)bounds [i];
+ if (candidates == null)
+ return false;
+
+ if (candidates.Count == 1) {
+ unfixed_types[i] = null;
+ fixed_types[i] = (Type)candidates[0];
+ return true;
+ }
+
+ //
+ // Determines a unique type from which there is
+ // a standard implicit conversion to all the other
+ // candidate types.
+ //
+ Type best_candidate = null;
+ int cii;
+ int candidates_count = candidates.Count;
+ for (int ci = 0; ci < candidates_count; ++ci) {
+ Type candidate = (Type)candidates [ci];
+ for (cii = 0; cii < candidates_count; ++cii) {
+ if (cii == ci)
+ continue;
+
+ if (!Convert.ImplicitConversionExists (null,
+ new TypeExpression ((Type)candidates [cii], Location.Null), candidate)) {
+ break;
+ }
+ }
+
+ if (cii != candidates_count)
+ continue;
+
+ if (best_candidate != null)
+ return false;
+
+ best_candidate = candidate;
+ }
+
+ if (best_candidate == null)
+ return false;
+
+ unfixed_types[i] = null;
+ fixed_types[i] = best_candidate;
+ return true;
+ }
+
+ //
+ // Uses inferred types to inflate delegate type argument
+ //
+ public Type InflateGenericArgument (Type parameter)
+ {
+ if (parameter.IsGenericParameter) {
+ //
+ // Inflate method generic argument (MVAR) only
+ //
+ if (parameter.DeclaringMethod == null)
+ return parameter;
+
+ return fixed_types [parameter.GenericParameterPosition];
+ }
+
+ if (parameter.IsGenericType) {
+ Type [] parameter_targs = parameter.GetGenericArguments ();
+ for (int ii = 0; ii < parameter_targs.Length; ++ii) {
+ parameter_targs [ii] = InflateGenericArgument (parameter_targs [ii]);
+ }
+ return parameter.GetGenericTypeDefinition ().MakeGenericType (parameter_targs);
+ }
+
+ return parameter;
+ }
+
+ //
+ // Tests whether all delegate input arguments are fixed and generic output type
+ // requires output type inference
+ //
+ public bool IsReturnTypeNonDependent (MethodInfo invoke, Type returnType)
{
- throw new NotImplementedException ();
+ if (returnType.IsGenericParameter) {
+ if (IsFixed (returnType))
+ return false;
+ } else if (returnType.IsGenericType) {
+ if (TypeManager.IsDelegateType (returnType)) {
+ invoke = Delegate.GetInvokeMethod (returnType, returnType);
+ return IsReturnTypeNonDependent (invoke, invoke.ReturnType);
+ }
+
+ Type[] g_args = returnType.GetGenericArguments ();
+
+ // At least one unfixed return type has to exist
+ if (AllTypesAreFixed (g_args))
+ return false;
+ } else {
+ return false;
+ }
+
+ // All generic input arguments have to be fixed
+ AParametersCollection d_parameters = TypeManager.GetParameterData (invoke);
+ return AllTypesAreFixed (d_parameters.Types);
}
- public Type InflateGenericArgument (Type t)
+ bool IsFixed (Type type)
+ {
+ return IsUnfixed (type) == -1;
+ }
+
+ int IsUnfixed (Type type)
+ {
+ if (!type.IsGenericParameter)
+ return -1;
+
+ //return unfixed_types[type.GenericParameterPosition] != null;
+ for (int i = 0; i < unfixed_types.Length; ++i) {
+ if (unfixed_types [i] == type)
+ return i;
+ }
+
+ return -1;
+ }
+
+ //
+ // 26.3.3.9 Lower-bound Inference
+ //
+ public int LowerBoundInference (Type u, Type v)
+ {
+ // If V is one of the unfixed type arguments
+ int pos = IsUnfixed (v);
+ if (pos != -1) {
+ AddToBounds (u, pos);
+ return 1;
+ }
+
+ // If U is an array type
+ if (u.IsArray) {
+ int u_dim = u.GetArrayRank ();
+ Type v_e;
+ Type u_e = TypeManager.GetElementType (u);
+
+ if (v.IsArray) {
+ if (u_dim != v.GetArrayRank ())
+ return 0;
+
+ v_e = TypeManager.GetElementType (v);
+
+ if (u.IsByRef) {
+ return LowerBoundInference (u_e, v_e);
+ }
+
+ return ExactInference (u_e, v_e);
+ }
+
+ if (u_dim != 1)
+ return 0;
+
+ if (v.IsGenericType) {
+ Type g_v = v.GetGenericTypeDefinition ();
+ if ((g_v != TypeManager.generic_ilist_type) && (g_v != TypeManager.generic_icollection_type) &&
+ (g_v != TypeManager.generic_ienumerable_type))
+ return 0;
+
+ v_e = TypeManager.GetTypeArguments (v)[0];
+
+ if (u.IsByRef) {
+ return LowerBoundInference (u_e, v_e);
+ }
+
+ return ExactInference (u_e, v_e);
+ }
+ } else if (v.IsGenericType && !v.IsGenericTypeDefinition) {
+ //
+ // if V is a constructed type C<V1..Vk> and there is a unique set of types U1..Uk
+ // such that a standard implicit conversion exists from U to C<U1..Uk> then an exact
+ // inference is made from each Ui for the corresponding Vi
+ //
+ ArrayList u_candidates = new ArrayList ();
+ if (u.IsGenericType)
+ u_candidates.Add (u);
+
+ for (Type t = u.BaseType; t != null; t = t.BaseType) {
+ if (t.IsGenericType && !t.IsGenericTypeDefinition)
+ u_candidates.Add (t);
+ }
+
+ // TODO: Implement GetGenericInterfaces only and remove
+ // the if from foreach
+ u_candidates.AddRange (TypeManager.GetInterfaces (u));
+
+ Type open_v = v.GetGenericTypeDefinition ();
+ Type [] unique_candidate_targs = null;
+ Type [] ga_v = v.GetGenericArguments ();
+ foreach (Type u_candidate in u_candidates) {
+ if (!u_candidate.IsGenericType || u_candidate.IsGenericTypeDefinition)
+ continue;
+
+ if (TypeManager.DropGenericTypeArguments (u_candidate) != open_v)
+ continue;
+
+ //
+ // The unique set of types U1..Uk means that if we have an interface C<T>,
+ // class U: C<int>, C<long> then no type inference is made when inferring
+ // from U to C<T> because T could be int or long
+ //
+ if (unique_candidate_targs != null) {
+ Type[] second_unique_candidate_targs = u_candidate.GetGenericArguments ();
+ if (TypeManager.IsEqual (unique_candidate_targs, second_unique_candidate_targs)) {
+ unique_candidate_targs = second_unique_candidate_targs;
+ continue;
+ }
+
+ //
+ // This should always cause type inference failure
+ //
+ failed = true;
+ return 1;
+ }
+
+ unique_candidate_targs = u_candidate.GetGenericArguments ();
+ }
+
+ if (unique_candidate_targs != null) {
+ int score = 0;
+ for (int i = 0; i < unique_candidate_targs.Length; ++i)
+ if (ExactInference (unique_candidate_targs [i], ga_v [i]) == 0)
+ ++score;
+ return score;
+ }
+ }
+
+ return 0;
+ }
+
+ //
+ // 26.3.3.6 Output Type Inference
+ //
+ public int OutputTypeInference (EmitContext ec, Expression e, Type t)
+ {
+ // If e is a lambda or anonymous method with inferred return type
+ AnonymousMethodExpression ame = e as AnonymousMethodExpression;
+ if (ame != null) {
+ Type rt = ame.InferReturnType (ec, this, t);
+ MethodInfo invoke = Delegate.GetInvokeMethod (t, t);
+
+ if (rt == null) {
+ AParametersCollection pd = TypeManager.GetParameterData (invoke);
+ return ame.Parameters.Count == pd.Count ? 1 : 0;
+ }
+
+ Type rtype = invoke.ReturnType;
+#if MS_COMPATIBLE
+ // Blablabla, because reflection does not work with dynamic types
+ Type [] g_args = t.GetGenericArguments ();
+ rtype = g_args [rtype.GenericParameterPosition];
+#endif
+ return LowerBoundInference (rt, rtype) + 1;
+ }
+
+ //
+ // if E is a method group and T is a delegate type or expression tree type
+ // return type Tb with parameter types T1..Tk and return type Tb, and overload
+ // resolution of E with the types T1..Tk yields a single method with return type U,
+ // then a lower-bound inference is made from U for Tb.
+ //
+ if (e is MethodGroupExpr) {
+ // TODO: Or expression tree
+ if (!TypeManager.IsDelegateType (t))
+ return 0;
+
+ MethodInfo invoke = Delegate.GetInvokeMethod (t, t);
+ Type rtype = invoke.ReturnType;
+#if MS_COMPATIBLE
+ // Blablabla, because reflection does not work with dynamic types
+ Type [] g_args = t.GetGenericArguments ();
+ rtype = g_args [rtype.GenericParameterPosition];
+#endif
+
+ if (!TypeManager.IsGenericType (rtype))
+ return 0;
+
+ MethodGroupExpr mg = (MethodGroupExpr) e;
+ ArrayList args = DelegateCreation.CreateDelegateMethodArguments (invoke, e.Location);
+ mg = mg.OverloadResolve (ec, ref args, true, e.Location);
+ if (mg == null)
+ return 0;
+
+ // TODO: What should happen when return type is of generic type ?
+ throw new NotImplementedException ();
+// return LowerBoundInference (null, rtype) + 1;
+ }
+
+ //
+ // if e is an expression with type U, then
+ // a lower-bound inference is made from U for T
+ //
+ return LowerBoundInference (e.Type, t) * 2;
+ }
+
+ static void RemoveDependentTypes (ArrayList types, Type returnType)
{
- throw new NotImplementedException ();
+ if (returnType.IsGenericParameter) {
+ types [returnType.GenericParameterPosition] = null;
+ return;
+ }
+
+ if (returnType.IsGenericType) {
+ foreach (Type t in returnType.GetGenericArguments ()) {
+ RemoveDependentTypes (types, t);
+ }
+ }
+ }
+
+ public bool UnfixedVariableExists {
+ get {
+ if (unfixed_types == null)
+ return false;
+
+ foreach (Type ut in unfixed_types)
+ if (ut != null)
+ return true;
+ return false;
+ }
}
}
}
projects / mono.git / blobdiff