//
// Authors: Martin Baulig (martin@ximian.com)
// Miguel de Icaza (miguel@ximian.com)
+// Marek Safar (marek.safar@gmail.com)
//
// Licensed under the terms of the GNU GPL
//
Constraints constraints;
Location loc;
GenericTypeParameterBuilder type;
+ MemberCache member_cache;
public TypeParameter (DeclSpace parent, DeclSpace decl, string name,
Constraints constraints, Attributes attrs, Location loc)
get { return constraints; }
}
- public bool HasConstructorConstraint {
- get { return constraints != null && constraints.HasConstructorConstraint; }
- }
-
public DeclSpace DeclSpace {
get { return decl; }
}
}
MemberCache IMemberContainer.BaseCache {
- get { return null; }
+ get {
+ if (gc == null)
+ return null;
+
+ if (gc.EffectiveBaseClass.BaseType == null)
+ return null;
+
+ return TypeManager.LookupMemberCache (gc.EffectiveBaseClass.BaseType);
+ }
}
bool IMemberContainer.IsInterface {
- get { return true; }
+ get { return false; }
}
MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
return FindMembers (mt, bf, null, null);
}
- MemberCache IMemberContainer.MemberCache {
- get { return null; }
+ 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 (constraints == null)
+ if (gc == null)
return MemberList.Empty;
ArrayList members = new ArrayList ();
bool has_class_constr = false;
if (list.Count > 0) {
Type first = (Type) list [0];
- has_class_constr = !first.IsInterface && !first.IsGenericParameter;
+ has_class_constr = !first.IsGenericParameter && !first.IsInterface;
}
if ((list.Count > 0) && has_class_constr) {
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;
ok = false;
continue;
}
- if (te is TypeParameterExpr)
- has_type_args = true;
+
+ 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) {
Report.Error (306, Location, "The type `{0}' may not be used " +
"as a type argument", TypeManager.CSharpName (te.Type));
Expression.Error_VoidInvalidInTheContext (Location);
return false;
}
-
- atypes [i] = te.Type;
}
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
public override bool AsAccessible (DeclSpace ds, int flags)
{
+ foreach (Type t in atypes) {
+ if (!ds.AsAccessible (t, flags))
+ return false;
+ }
+
return ds.AsAccessible (gt, flags);
}
if (TypeManager.IsBuiltinType (atype) || atype.IsValueType)
return true;
- if (HasDefaultConstructor (ec.DeclContainer.TypeBuilder, atype))
+ if (HasDefaultConstructor (atype))
return true;
Report_SymbolRelatedToPreviousError ();
return false;
}
- bool HasDefaultConstructor (Type containerType, Type atype)
+ bool HasDefaultConstructor (Type atype)
{
if (atype.IsAbstract)
return false;
}
TypeParameter tparam = TypeManager.LookupTypeParameter (atype);
- if (tparam != null)
- return tparam.HasConstructorConstraint;
+ if (tparam != null) {
+ if (tparam.GenericConstraints == null)
+ return false;
+ else
+ return tparam.GenericConstraints.HasConstructorConstraint;
+ }
MemberList list = TypeManager.FindMembers (
atype, MemberTypes.Constructor,
Error_ParameterNameCollision (p.Location, type_argument_name, "method parameter");
return false;
}
+
+ // FIXME: This is wrong, since it only looks at the outermost set of variables
if (block != null) {
- LocalInfo li = (LocalInfo)block.Variables[type_argument_name];
+ LocalInfo li = (LocalInfo)block.Variables [type_argument_name];
if (li != null) {
Error_ParameterNameCollision (li.Location, type_argument_name, "local variable");
return false;
ec.ig.Emit(OpCodes.Initobj, type);
temp_storage.Emit(ec);
}
+
+ protected override void CloneTo (CloneContext clonectx, Expression t)
+ {
+ DefaultValueExpression target = (DefaultValueExpression) t;
+
+ target.expr = expr.Clone (clonectx);
+ }
}
public class NullableType : TypeExpr
static void InitGenericCodeHelpers ()
{
// Activator
- Type [] type_arg = { type_type };
activator_create_instance = GetMethod (
- activator_type, "CreateInstance", type_arg);
+ activator_type, "CreateInstance", Type.EmptyTypes);
}
static Type CoreLookupType (string ns, string name, int arity)
/// 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_infered,
- Type[] method_infered)
+ public static bool MayBecomeEqualGenericTypes (Type a, Type b, Type[] class_inferred,
+ Type[] method_inferred)
{
if (a.IsGenericParameter) {
//
//
if (b.IsGenericParameter || !b.IsGenericType) {
int pos = a.GenericParameterPosition;
- Type[] args = a.DeclaringMethod != null ? method_infered : class_infered;
+ Type[] args = a.DeclaringMethod != null ? method_inferred : class_inferred;
if (args [pos] == null) {
args [pos] = b;
return true;
}
if (b.IsGenericParameter)
- return MayBecomeEqualGenericTypes (b, a, class_infered, method_infered);
+ return MayBecomeEqualGenericTypes (b, a, class_inferred, method_inferred);
//
// At this point, neither a nor b are a type parameter.
//
if (a.IsGenericType || b.IsGenericType)
- return MayBecomeEqualGenericInstances (a, b, class_infered, method_infered);
+ return MayBecomeEqualGenericInstances (a, b, class_inferred, method_inferred);
//
// If both of them are arrays.
a = a.GetElementType ();
b = b.GetElementType ();
- return MayBecomeEqualGenericTypes (a, b, class_infered, method_infered);
+ return MayBecomeEqualGenericTypes (a, b, class_inferred, method_inferred);
}
//
// particular instantiation (26.3.1).
//
public static bool MayBecomeEqualGenericInstances (Type a, Type b,
- Type[] class_infered,
- Type[] method_infered)
+ Type[] class_inferred,
+ Type[] method_inferred)
{
if (!a.IsGenericType || !b.IsGenericType)
return false;
return false;
return MayBecomeEqualGenericInstances (
- GetTypeArguments (a), GetTypeArguments (b), class_infered, method_infered);
+ GetTypeArguments (a), GetTypeArguments (b), class_inferred, method_inferred);
}
public static bool MayBecomeEqualGenericInstances (Type[] aargs, Type[] bargs,
- Type[] class_infered,
- Type[] method_infered)
+ 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_infered, method_infered))
+ if (!MayBecomeEqualGenericTypes (aargs [i], bargs [i], class_inferred, method_inferred))
return false;
}
return true;
}
- //
- // Type inference.
- //
+ /// <summary>
+ /// Type inference. Try to infer the type arguments from the params method
+ /// `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 bool InferParamsTypeArguments (EmitContext ec, ArrayList arguments,
+ ref MethodBase method)
+ {
+ if (!TypeManager.IsGenericMethod (method))
+ return true;
- static bool InferType (Type pt, Type at, Type[] infered)
+ // if there are no arguments, there's no way to infer the type-arguments
+ if (arguments == null || arguments.Count == 0)
+ return false;
+
+ ParameterData pd = TypeManager.GetParameterData (method);
+ int pd_count = pd.Count;
+ int arg_count = arguments.Count;
+
+ if (pd_count == 0)
+ return false;
+
+ if (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS)
+ return false;
+
+ if (pd_count - 1 > arg_count)
+ return false;
+
+ Type[] method_args = method.GetGenericArguments ();
+ Type[] inferred_types = new Type [method_args.Length];
+
+ //
+ // If we have come this far, the case which
+ // remains is when the number of parameters is
+ // less than or equal to the argument count.
+ //
+ for (int i = 0; i < pd_count - 1; ++i) {
+ Argument a = (Argument) arguments [i];
+
+ if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ continue;
+
+ Type pt = pd.ParameterType (i);
+ Type at = a.Type;
+
+ if (!TypeInferenceV2.UnifyType (pt, at, inferred_types))
+ return false;
+ }
+
+ Type element_type = TypeManager.GetElementType (pd.ParameterType (pd_count - 1));
+
+ for (int i = pd_count - 1; i < arg_count; i++) {
+ Argument a = (Argument) arguments [i];
+
+ if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ continue;
+
+ if (!TypeInferenceV2.UnifyType (element_type, a.Type, inferred_types))
+ return false;
+ }
+
+ for (int i = 0; i < inferred_types.Length; i++)
+ if (inferred_types [i] == null)
+ return false;
+
+ method = ((MethodInfo)method).MakeGenericMethod (inferred_types);
+ 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 bool InferTypeArguments (EmitContext ec,
+ ArrayList arguments,
+ ref MethodBase method)
+ {
+ if (!TypeManager.IsGenericMethod (method))
+ return true;
+
+ ATypeInference ti = ATypeInference.CreateInstance (arguments);
+ Type[] i_args = ti.InferMethodArguments (ec, method);
+ if (i_args == null)
+ return false;
+
+ method = ((MethodInfo) method).MakeGenericMethod (i_args);
+ return true;
+ }
+
+ /// <summary>
+ /// Type inference.
+ /// </summary>
+ public static bool InferTypeArguments (ParameterData 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.LINQ)
+ return new TypeInferenceV3 (arguments);
+
+ return new TypeInferenceV2 (arguments);
+ }
+
+ 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)
+ {
+ ParameterData 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.ParameterType (i);
+ }
+
+ if (!InferTypeArguments (param_types, arg_types, inferred_types))
+ return null;
+
+ return inferred_types;
+ }
+
+ public override Type[] InferMethodArguments (EmitContext ec, MethodBase method)
+ {
+ ParameterData pd = TypeManager.GetParameterData (method);
+ if (arg_count != pd.Count)
+ return null;
+
+ Type[] method_generic_args = method.GetGenericArguments ();
+ Type[] arg_types = new Type[pd.Count];
+ for (int i = 0; i < arg_count; i++) {
+ Argument a = (Argument) arguments[i];
+ if (a.Expr is NullLiteral || a.Expr is MethodGroupExpr || a.Expr is AnonymousMethodExpression)
+ continue;
+
+ arg_types[i] = a.Type;
+ }
+
+ Type[] inferred_types = new Type [method_generic_args.Length];
+ if (!InferTypeArguments (pd.Types, arg_types, inferred_types))
+ return null;
+
+ return inferred_types;
+ }
+
+ 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)
int pos = pt.GenericParameterPosition;
- if (infered [pos] == null) {
- infered [pos] = at;
- return true;
- }
+ if (inferred [pos] == null)
+ inferred [pos] = at;
- if (infered [pos] != at)
- return false;
-
- return true;
+ return inferred [pos] == at;
}
if (!pt.ContainsGenericParameters) {
if (at.ContainsGenericParameters)
- return InferType (at, pt, infered);
+ return UnifyType (at, pt, inferred);
else
return true;
}
if (at.GetArrayRank () != pt.GetArrayRank ())
return false;
- return InferType (pt.GetElementType (), at.GetElementType (), infered);
+ return UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
}
if (!pt.IsGenericType)
return false;
Type gt = pt.GetGenericTypeDefinition ();
- if ((gt != generic_ilist_type) && (gt != generic_icollection_type) &&
- (gt != generic_ienumerable_type))
+ if ((gt != TypeManager.generic_ilist_type) && (gt != TypeManager.generic_icollection_type) &&
+ (gt != TypeManager.generic_ienumerable_type))
return false;
- Type[] args = GetTypeArguments (pt);
- return InferType (args [0], at.GetElementType (), infered);
+ Type[] args = TypeManager.GetTypeArguments (pt);
+ return UnifyType (args[0], at.GetElementType (), inferred);
}
if (pt.IsArray) {
if (!at.IsArray ||
- (pt.GetArrayRank () != at.GetArrayRank ()))
+ (pt.GetArrayRank () != at.GetArrayRank ()))
return false;
- return InferType (pt.GetElementType (), at.GetElementType (), infered);
+ return UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
}
if (pt.IsByRef && at.IsByRef)
- return InferType (pt.GetElementType (), at.GetElementType (), infered);
+ return UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
ArrayList list = new ArrayList ();
if (at.IsGenericType)
list.Add (at);
list.AddRange (TypeManager.GetInterfaces (at));
- bool found_one = false;
-
foreach (Type type in list) {
if (!type.IsGenericType)
continue;
- Type[] infered_types = new Type [infered.Length];
+ if (TypeManager.DropGenericTypeArguments (pt) != TypeManager.DropGenericTypeArguments (type))
+ continue;
+
+ if (!UnifyTypes (pt.GetGenericArguments (), type.GetGenericArguments (), inferred))
+ return false;
+ }
- if (!InferGenericInstance (pt, type, infered_types))
+ 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
+ {
+ public TypeInferenceV3 (ArrayList arguments)
+ : base (arguments)
+ {
+ }
+
+ public override Type[] InferDelegateArguments (MethodBase method)
+ {
+ ParameterData 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;
- for (int i = 0; i < infered_types.Length; i++) {
- if (infered [i] == null) {
- infered [i] = infered_types [i];
- continue;
- }
+ context.LowerBoundInference ((Type)arguments[i], t);
+ }
- if (infered [i] != infered_types [i])
- return false;
+ if (!context.FixAllTypes ())
+ return null;
+
+ return context.InferredTypeArguments;
+ }
+
+ public override Type[] InferMethodArguments (EmitContext ec, MethodBase method)
+ {
+ ParameterData pd = TypeManager.GetParameterData (method);
+ if (arg_count != pd.Count)
+ return null;
+
+ Type[] method_generic_args = method.GetGenericArguments ();
+ TypeInferenceContext context = new TypeInferenceContext (method_generic_args);
+ if (!InferInPhases (ec, context, pd))
+ return null;
+
+ return context.InferredTypeArguments;
+ }
+
+ //
+ // Implements method type arguments inference
+ //
+ bool InferInPhases (EmitContext ec, TypeInferenceContext tic, ParameterData methodParameters)
+ {
+ //
+ // The first inference phase
+ //
+ for (int i = 0; i < arg_count; i++) {
+ Type method_parameter = methodParameters.ParameterType (i);
+
+ Argument a = (Argument) arguments[i];
+
+ //
+ // 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) {
+ am.ExplicitTypeInference (tic, method_parameter);
+ continue;
}
- found_one = true;
+ if (a.Expr.Type == TypeManager.null_type)
+ continue;
+
+ //
+ // Otherwise an output type inference is made
+ //
+ tic.OutputTypeInference (ec, a.Expr, method_parameter);
}
- return found_one;
+ //
+ // 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 (methodParameters, ref fixed_any))
+ return false;
+
+ return DoSecondPhase (ec, tic, methodParameters, !fixed_any);
}
- static bool InferGenericInstance (Type pt, Type at, Type[] infered_types)
+ bool DoSecondPhase (EmitContext ec, TypeInferenceContext tic, ParameterData methodParameters, bool fixDependent)
{
- Type[] at_args = at.GetGenericArguments ();
- Type[] pt_args = pt.GetGenericArguments ();
+ bool fixed_any = false;
+ if (fixDependent && !tic.FixDependentTypes (methodParameters, ref fixed_any))
+ return false;
+
+ // If no further unfixed type variables exist, type inference succeeds
+ if (!tic.UnfixedVariableExists)
+ return true;
- if (at_args.Length != pt_args.Length)
+ if (!fixed_any && fixDependent)
return false;
- for (int i = 0; i < at_args.Length; i++) {
- if (!InferType (pt_args [i], at_args [i], infered_types))
- 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++) {
+ Type t_i = methodParameters.ParameterType (i);
+ if (!TypeManager.IsDelegateType (t_i))
+ continue;
+
+ 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
+
+ bool all_params_fixed = false;
+ if (rtype.IsGenericParameter) {
+ all_params_fixed = tic.IsTypeNonDependent (mi, rtype);
+ } else if (rtype.IsGenericType) {
+ all_params_fixed = true;
+ foreach (Type t in rtype.GetGenericArguments ())
+ if (!tic.IsTypeNonDependent (mi, t)) {
+ all_params_fixed = false;
+ break;
+ }
+ }
+
+ if (all_params_fixed)
+ tic.OutputTypeInference (ec, ((Argument) arguments[i]).Expr, t_i);
}
- for (int i = 0; i < infered_types.Length; i++) {
- if (infered_types [i] == null)
- return false;
+
+ return DoSecondPhase (ec, tic, methodParameters, true);
+ }
+ }
+
+ public class TypeInferenceContext
+ {
+ readonly Type[] unfixed_types;
+ readonly Type[] fixed_types;
+ readonly ArrayList[] bounds;
+
+ public TypeInferenceContext (Type[] typeArguments)
+ {
+ if (typeArguments.Length == 0)
+ throw new ArgumentException ("Empty generic arguments");
+
+ unfixed_types = new Type[typeArguments.Length];
+ Array.Copy (typeArguments, unfixed_types, unfixed_types.Length);
+ bounds = new ArrayList[typeArguments.Length];
+ fixed_types = new Type[typeArguments.Length];
+ }
+
+ public Type[] InferredTypeArguments {
+ get {
+ return fixed_types;
}
+ }
- return true;
+ void AddToBounds (Type t, int index)
+ {
+ ArrayList a = bounds[index];
+ if (a == null) {
+ a = new ArrayList ();
+ a.Add (t);
+ bounds[index] = a;
+ return;
+ }
+
+ if (a.Contains (t))
+ return;
+
+ a.Add (t);
}
- /// <summary>
- /// Type inference. Try to infer the type arguments from the params method
- /// `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 bool InferParamsTypeArguments (EmitContext ec, ArrayList arguments,
- ref MethodBase method)
+ //
+ // 26.3.3.8 Exact Inference
+ //
+ public void ExactInference (Type u, Type v)
{
- if (!TypeManager.IsGenericMethod (method))
- return true;
+ // If V is an array type
+ if (v.IsArray) {
+ if (!u.IsArray)
+ return;
- // if there are no arguments, there's no way to infer the type-arguments
- if (arguments == null || arguments.Count == 0)
- return false;
+ if (u.GetArrayRank () != v.GetArrayRank ())
+ return;
- ParameterData pd = TypeManager.GetParameterData (method);
- int pd_count = pd.Count;
- int arg_count = arguments.Count;
+ ExactInference (TypeManager.GetElementType (u), TypeManager.GetElementType (v));
+ return;
+ }
- if (pd_count == 0)
- return false;
+ // If V is constructed type and U is constructed type
+ if (v.IsGenericType && !v.IsGenericTypeDefinition) {
+ if (!u.IsGenericType)
+ return;
- if (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS)
- return false;
+ Type [] ga_u = u.GetGenericArguments ();
+ Type [] ga_v = v.GetGenericArguments ();
+ if (ga_u.Length != ga_v.Length)
+ return;
- if (pd_count - 1 > arg_count)
- return false;
+ for (int i = 0; i < ga_u.Length; ++i)
+ ExactInference (ga_u [i], ga_v [i]);
- Type[] method_args = method.GetGenericArguments ();
- Type[] infered_types = new Type [method_args.Length];
+ return;
+ }
- //
- // If we have come this far, the case which
- // remains is when the number of parameters is
- // less than or equal to the argument count.
- //
- for (int i = 0; i < pd_count - 1; ++i) {
- Argument a = (Argument) arguments [i];
+ // If V is one of the unfixed type arguments
+ int pos = IsUnfixed (v);
+ if (pos == -1)
+ return;
- if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ AddToBounds (u, pos);
+ }
+
+ 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 (ParameterData methodParameters, ref bool fixed_any)
+ {
+ for (int i = 0; i < unfixed_types.Length; ++i) {
+ if (unfixed_types[i] == null)
continue;
- Type pt = pd.ParameterType (i);
- Type at = a.Type;
+ if (bounds[i] == null)
+ continue;
- if (!InferType (pt, at, infered_types))
+ if (!FixType (i))
return false;
+ fixed_any = true;
}
+ return true;
+ }
- Type element_type = TypeManager.GetElementType (pd.ParameterType (pd_count - 1));
+ //
+ // All unfixed type variables Xi which depend on no Xj are fixed
+ //
+ public bool FixIndependentTypeArguments (ParameterData methodParameters, ref bool fixed_any)
+ {
+ ArrayList types_to_fix = new ArrayList (unfixed_types);
+ foreach (Type t in methodParameters.Types) {
+ if (t.IsGenericParameter)
+ continue;
- for (int i = pd_count - 1; i < arg_count; i++) {
- Argument a = (Argument) arguments [i];
+ if (!TypeManager.IsDelegateType (t))
+ continue;
- if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ MethodInfo invoke = Delegate.GetInvokeMethod (t, t);
+ Type rtype = invoke.ReturnType;
+ if (!rtype.IsGenericParameter && !rtype.IsGenericType)
continue;
- if (!InferType (element_type, a.Type, infered_types))
- return false;
+#if MS_COMPATIBLE
+ // Blablabla, because reflection does not work with dynamic types
+ Type [] g_args = t.GetGenericArguments ();
+ if (!rtype.IsGenericParameter)
+ continue;
+
+ rtype = g_args [rtype.GenericParameterPosition];
+#endif
+ // Remove dependent types, they cannot be fixed yet
+ RemoveDependentTypes (types_to_fix, rtype);
}
- for (int i = 0; i < infered_types.Length; i++)
- if (infered_types [i] == null)
+ foreach (Type t in types_to_fix) {
+ if (t == null)
+ continue;
+
+ if (!FixType (IsUnfixed (t))) {
return false;
+ }
+ }
- method = ((MethodInfo)method).MakeGenericMethod (infered_types);
+ fixed_any = types_to_fix.Count > 0;
return true;
}
- static bool InferTypeArguments (Type[] param_types, Type[] arg_types,
- Type[] infered_types)
+ //
+ // 26.3.3.10 Fixing
+ //
+ public bool FixType (int i)
{
- if (infered_types == null)
+ // It's already fixed
+ if (unfixed_types[i] == null)
+ throw new InternalErrorException ("Type argument has been already fixed");
+
+ ArrayList candidates = (ArrayList)bounds [i];
+ if (candidates == null)
return false;
- for (int i = 0; i < arg_types.Length; i++) {
- if (arg_types [i] == null)
+ if (candidates.Count == 1) {
+ unfixed_types[i] = null;
+ fixed_types[i] = (Type)candidates[0];
+ return true;
+ }
+
+ // TODO: Review, I think it is still wrong
+ Type best_candidate = null;
+ for (int ci = 0; ci < candidates.Count; ++ci) {
+ TypeExpr candidate = new TypeExpression ((Type)candidates[ci], Location.Null);
+ bool failed = false;
+ for (int cii = 0; cii < candidates.Count; ++cii) {
+ if (cii == ci)
+ continue;
+
+ if (!Convert.ImplicitStandardConversionExists (candidate, (Type)candidates[cii])) {
+ failed = true;
+ }
+ }
+
+ if (failed)
continue;
- if (!InferType (param_types [i], arg_types [i], infered_types))
+ if (best_candidate != null)
return false;
+
+ best_candidate = candidate.Type;
}
- for (int i = 0; i < infered_types.Length; i++)
- if (infered_types [i] == null)
+ if (best_candidate == null)
+ return false;
+
+ unfixed_types[i] = null;
+ fixed_types[i] = best_candidate;
+ return true;
+ }
+
+ public bool IsTypeNonDependent (MethodInfo mi, Type type)
+ {
+ if (IsUnfixed (type) < 0)
+ return false;
+
+ ParameterData d_parameters = TypeManager.GetParameterData (mi);
+ foreach (Type t in d_parameters.Types) {
+ if (!t.IsGenericParameter)
+ continue;
+
+ if (IsUnfixed (t) >= 0)
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 bool InferTypeArguments (ArrayList arguments,
- ref MethodBase method)
+ public int IsUnfixed (Type type)
{
- if (!TypeManager.IsGenericMethod (method))
- return true;
+ if (!type.IsGenericParameter)
+ return -1;
- int arg_count;
- if (arguments != null)
- arg_count = arguments.Count;
- else
- arg_count = 0;
+ //return unfixed_types[type.GenericParameterPosition] != null;
+ for (int i = 0; i < unfixed_types.Length; ++i) {
+ if (unfixed_types [i] == type)
+ return i;
+ }
- ParameterData pd = TypeManager.GetParameterData (method);
- if (arg_count != pd.Count)
- return false;
+ return -1;
+ }
- Type[] method_args = method.GetGenericArguments ();
+ //
+ // 26.3.3.9 Lower-bound Inference
+ //
+ public void LowerBoundInference (Type u, Type v)
+ {
+ // 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;
- bool is_open = false;
- for (int i = 0; i < method_args.Length; i++) {
- if (method_args [i].IsGenericParameter) {
- is_open = true;
- break;
+ v_e = TypeManager.GetElementType (v);
+
+ if (u.IsByRef) {
+ LowerBoundInference (u_e, v_e);
+ return;
+ }
+ ExactInference (u_e, v_e);
+ return;
}
- }
- // If none of the method parameters mention a generic parameter, we can't infer the generic parameters
- if (!is_open)
- return !TypeManager.IsGenericMethodDefinition (method);
+ if (u_dim != 1)
+ return;
- Type[] infered_types = new Type [method_args.Length];
+ 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;
- Type[] param_types = new Type [pd.Count];
- Type[] arg_types = new Type [pd.Count];
+ v_e = TypeManager.GetTypeArguments (v)[0];
- for (int i = 0; i < arg_count; i++) {
- param_types [i] = pd.ParameterType (i);
+ if (u.IsByRef) {
+ LowerBoundInference (u_e, v_e);
+ return;
+ }
+ ExactInference (u_e, v_e);
+ return;
+ }
+ // If V is a constructed type C<V1..Vk>
+ } else if (v.IsGenericType && !v.IsGenericTypeDefinition) {
+ Type[] ga_u = u.GetGenericArguments ();
+ Type[] ga_v = v.GetGenericArguments ();
+ if (ga_u.Length != ga_v.Length)
+ return;
- Argument a = (Argument) arguments [i];
- if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr) ||
- (a.Expr is AnonymousMethodExpression))
- continue;
+ v = v.GetGenericTypeDefinition ().MakeGenericType (ga_u);
- arg_types [i] = a.Type;
+ // And standard implicit conversion exists from U to C<U1..Uk>
+ if (!Convert.ImplicitStandardConversionExists (new TypeExpression (u, Location.Null), v))
+ return;
+
+ for (int i = 0; i < ga_u.Length; ++i)
+ ExactInference (ga_u[i], ga_v[i]);
+
+ return;
}
- if (!InferTypeArguments (param_types, arg_types, infered_types))
- return false;
+ // Remove ref, out modifiers
+ if (v.HasElementType)
+ v = v.GetElementType ();
- method = ((MethodInfo)method).MakeGenericMethod (infered_types);
- return true;
+ // If V is one of the unfixed type arguments
+ int pos = IsUnfixed (v);
+ if (pos == -1)
+ return;
+
+ AddToBounds (u, pos);
}
- /// <summary>
- /// Type inference.
- /// </summary>
- public static bool InferTypeArguments (ParameterData apd,
- ref MethodBase method)
- {
- if (!TypeManager.IsGenericMethod (method))
- return true;
+ //
+ // 26.3.3.6 Output Type Inference
+ //
+ public void 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);
+ if (rt != null) {
+ 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
+ LowerBoundInference (rt, rtype);
+ }
+ return;
+ }
- ParameterData pd = TypeManager.GetParameterData (method);
- if (apd.Count != pd.Count)
- return false;
+ if (e is MethodGroupExpr) {
+ throw new NotImplementedException ();
+ }
- Type[] method_args = method.GetGenericArguments ();
- Type[] infered_types = new Type [method_args.Length];
+ //
+ // if e is an expression with type U, then
+ // a lower-bound inference is made from U for T
+ //
+ LowerBoundInference (e.Type, t);
+ }
- Type[] param_types = new Type [pd.Count];
- Type[] arg_types = new Type [pd.Count];
+ static void RemoveDependentTypes (ArrayList types, Type returnType)
+ {
+ if (returnType.IsGenericParameter) {
+ types [returnType.GenericParameterPosition] = null;
+ return;
+ }
- for (int i = 0; i < apd.Count; i++) {
- param_types [i] = pd.ParameterType (i);
- arg_types [i] = apd.ParameterType (i);
+ if (returnType.IsGenericType) {
+ foreach (Type t in returnType.GetGenericArguments ()) {
+ RemoveDependentTypes (types, t);
+ }
}
+ }
- if (!InferTypeArguments (param_types, arg_types, infered_types))
+ public bool UnfixedVariableExists {
+ get {
+ foreach (Type ut in unfixed_types)
+ if (ut != null)
+ return true;
return false;
-
- method = ((MethodInfo)method).MakeGenericMethod (infered_types);
- return true;
+ }
}
}
projects / mono.git / blobdiff