//
// 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
//
get { return constraints; }
}
- public bool HasConstructorConstraint {
- get { return constraints != null && constraints.HasConstructorConstraint; }
- }
-
public DeclSpace DeclSpace {
get { return decl; }
}
MemberList list = TypeManager.FindMembers (
gc.ClassConstraint, mt, bf, filter, criteria);
- Report.Debug (128, "TPARAM FIND MEMBERS #1", Name, mt, bf,
- filter, criteria, gc.ClassConstraint, list.Count);
-
members.AddRange (list);
}
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;
}
atypes[i] = te.Type;
-
- if (te is TypeParameterExpr) {
- has_type_args = true;
+ if (te.Type.IsGenericParameter) {
+ if (te is TypeParameterExpr)
+ has_type_args = true;
continue;
}
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)
return true;
}
- static bool UnifyType (Type pt, Type at, Type[] inferred)
+ /// <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;
+
+ // 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)
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 UnifyType (args [0], at.GetElementType (), inferred);
+ 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 UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
if (!type.IsGenericType)
continue;
- if (DropGenericTypeArguments (pt) != DropGenericTypeArguments (type))
+ if (TypeManager.DropGenericTypeArguments (pt) != TypeManager.DropGenericTypeArguments (type))
continue;
if (!UnifyTypes (pt.GetGenericArguments (), type.GetGenericArguments (), inferred))
return true;
}
- static bool UnifyTypes (Type[] pts, Type [] ats, Type [] inferred)
+ 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 true;
}
+ }
- /// <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)
+ //
+ // Implements C# 3.0 type inference
+ //
+ class TypeInferenceV3 : ATypeInference
+ {
+ public TypeInferenceV3 (ArrayList arguments)
+ : base (arguments)
{
- if (!TypeManager.IsGenericMethod (method))
- return true;
-
- // if there are no arguments, there's no way to infer the type-arguments
- if (arguments == null || arguments.Count == 0)
- return false;
+ }
+ public override Type[] InferDelegateArguments (MethodBase method)
+ {
ParameterData pd = TypeManager.GetParameterData (method);
- int pd_count = pd.Count;
- int arg_count = arguments.Count;
+ if (arg_count != pd.Count)
+ return null;
- if (pd_count == 0)
- return false;
+ Type[] d_gargs = method.GetGenericArguments ();
+ TypeInferenceContext context = new TypeInferenceContext (d_gargs);
- if (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS)
- return false;
+ // 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;
- if (pd_count - 1 > arg_count)
- return false;
+ context.LowerBoundInference ((Type)arguments[i], t);
+ }
- Type[] method_args = method.GetGenericArguments ();
- Type[] inferred_types = new Type [method_args.Length];
+ 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)
+ {
//
- // 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.
+ // The first inference phase
//
- for (int i = 0; i < pd_count - 1; ++i) {
- Argument a = (Argument) arguments [i];
+ for (int i = 0; i < arg_count; i++) {
+ Type method_parameter = methodParameters.ParameterType (i);
- if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ 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;
+ }
- Type pt = pd.ParameterType (i);
- Type at = a.Type;
+ if (a.Expr.Type == TypeManager.null_type)
+ continue;
- if (!UnifyType (pt, at, inferred_types))
- return false;
+ //
+ // Otherwise an output type inference is made
+ //
+ tic.OutputTypeInference (ec, a.Expr, method_parameter);
}
- Type element_type = TypeManager.GetElementType (pd.ParameterType (pd_count - 1));
+ //
+ // 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;
- for (int i = pd_count - 1; i < arg_count; i++) {
- Argument a = (Argument) arguments [i];
+ return DoSecondPhase (ec, tic, methodParameters, !fixed_any);
+ }
- if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ bool DoSecondPhase (EmitContext ec, TypeInferenceContext tic, ParameterData methodParameters, bool fixDependent)
+ {
+ 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 (!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++) {
+ Type t_i = methodParameters.ParameterType (i);
+ if (!TypeManager.IsDelegateType (t_i))
continue;
- if (!UnifyType (element_type, a.Type, inferred_types))
- return false;
+ 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 < inferred_types.Length; i++)
- if (inferred_types [i] == null)
- return false;
- method = ((MethodInfo)method).MakeGenericMethod (inferred_types);
- return true;
+ return DoSecondPhase (ec, tic, methodParameters, true);
}
+ }
- static bool InferTypeArguments (Type[] param_types, Type[] arg_types,
- Type[] inferred_types)
+ public class TypeInferenceContext
+ {
+ readonly Type[] unfixed_types;
+ readonly Type[] fixed_types;
+ readonly ArrayList[] bounds;
+
+ public TypeInferenceContext (Type[] typeArguments)
{
- for (int i = 0; i < arg_types.Length; i++) {
- if (arg_types [i] == null)
- continue;
+ if (typeArguments.Length == 0)
+ throw new ArgumentException ("Empty generic arguments");
- if (!UnifyType (param_types [i], arg_types [i], inferred_types))
- return false;
+ 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;
+ }
+ }
+
+ void AddToBounds (Type t, int index)
+ {
+ ArrayList a = bounds[index];
+ if (a == null) {
+ a = new ArrayList ();
+ a.Add (t);
+ bounds[index] = a;
+ return;
}
- for (int i = 0; i < inferred_types.Length; i++)
- if (inferred_types [i] == null)
- return false;
+ if (a.Contains (t))
+ return;
- return true;
+ a.Add (t);
}
//
- // Infers the remaining inferred_types from lambda expressions contained in the
- // invocation call.
+ // 26.3.3.8 Exact Inference
//
- static bool LambdaInfer (EmitContext ec, ArrayList arguments,
- Type[] param_types, Type[] arg_types, Type[] inferred_types)
+ public void ExactInference (Type u, Type v)
{
- int arg_count = arg_types.Length;
-
- for (int i = 0; i < arg_count; i++){
- Argument a = (Argument) arguments [i];
-
- LambdaExpression le = a.Expr as LambdaExpression;
-
- if (a == null)
+ // If V is an array type
+ if (v.IsArray) {
+ if (!u.IsArray)
+ return;
+
+ if (u.GetArrayRank () != v.GetArrayRank ())
+ return;
+
+ ExactInference (TypeManager.GetElementType (u), TypeManager.GetElementType (v));
+ return;
+ }
+
+ // If V is constructed type and U is constructed type
+ if (v.IsGenericType && !v.IsGenericTypeDefinition) {
+ if (!u.IsGenericType)
+ return;
+
+ Type [] ga_u = u.GetGenericArguments ();
+ Type [] ga_v = v.GetGenericArguments ();
+ if (ga_u.Length != ga_v.Length)
+ return;
+
+ for (int i = 0; i < ga_u.Length; ++i)
+ ExactInference (ga_u [i], ga_v [i]);
+
+ return;
+ }
+
+ // If V is one of the unfixed type arguments
+ int pos = IsUnfixed (v);
+ if (pos == -1)
+ return;
+
+ 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;
-
- //
- // TODO: "The argument is a lambda expression, in
- // the following called L, from which no inferences
- // have yet been made."
- //
-
- //
- // "The corresponding parameter’s type, in the
- // following called P, is a delegate type with a
- // return type that involves one or more method type
- // parameters."
- //
- //
- if (!TypeManager.IsDelegateType (param_types [i]))
+
+ if (bounds[i] == null)
continue;
-
- Type p_type = param_types [i];
- MethodGroupExpr method_group = Expression.MemberLookup (
- ec.ContainerType, p_type, "Invoke", MemberTypes.Method,
- Expression.AllBindingFlags, Location.Null) as MethodGroupExpr;
-
- if (method_group == null){
- // This we report elsewhere as -200, but here we can ignore
+
+ 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 (ParameterData methodParameters, ref bool fixed_any)
+ {
+ ArrayList types_to_fix = new ArrayList (unfixed_types);
+ foreach (Type t in methodParameters.Types) {
+ if (t.IsGenericParameter)
continue;
- }
- MethodInfo delegate_method = method_group.Methods [0] as MethodInfo;
- if (delegate_method == null){
- // This should not happen.
+
+ if (!TypeManager.IsDelegateType (t))
continue;
- }
-
- Type return_type = delegate_method.ReturnType;
- if (!return_type.IsGenericParameter)
+
+ MethodInfo invoke = Delegate.GetInvokeMethod (t, t);
+ Type rtype = invoke.ReturnType;
+ if (!rtype.IsGenericParameter && !rtype.IsGenericType)
continue;
-
- //
- // P and L have the same number of parameters, and
- // each parameter in P has the same modifiers as the
- // corresponding parameter in L, or no modifiers if
- // L has an implicitly typed parameter list.
- //
- ParameterData delegate_pd = TypeManager.GetParameterData (delegate_method);
- int delegate_pc = delegate_pd.Count;
- if (delegate_pc != le.Parameters.Count)
+
+#if MS_COMPATIBLE
+ // Blablabla, because reflection does not work with dynamic types
+ Type [] g_args = t.GetGenericArguments ();
+ if (!rtype.IsGenericParameter)
continue;
-#if false
- //FIXME
- if (le.HasExplicitParameters){
- for (int j = 0; j < delegate_pc; j++){
- if (delegate_pd.ParameterModifier [j] !=
- le.Parameters.ParameterModifier[j])
- goto do_continue;
- }
- } else {
- for (int j = 0; j < delegate_pc; j++)
- if (le.Parameters.ParameterModifier [j] != Parameter.Modifier.NONE)
- goto do_continue;
- }
+ rtype = g_args [rtype.GenericParameterPosition];
#endif
-
- //
- // TODO: P’s parameter types involve no method type
- // parameters or involve only method type parameters
- // for which a consistent set of inferences have
- // already been made.
- //
+ // Remove dependent types, they cannot be fixed yet
+ RemoveDependentTypes (types_to_fix, rtype);
+ }
- if (le.HasExplicitParameters){
- //
- // TODO: If L has an explicitly typed parameter
- // list, when inferred types are substituted for
- // method type parameters in P, each parameter in P
- // has the same type as the corresponding parameter
- // in L.
- //
- } else {
- //
- // TODO: If L has an implicitly typed parameter
- // list, when inferred types are substituted for
- // method type parameters in P and the resulting
- // parameter types are given to the parameters of L,
- // the body of L is a valid expression or statement
- // block.
+ foreach (Type t in types_to_fix) {
+ if (t == null)
+ continue;
+
+ if (!FixType (IsUnfixed (t))) {
+ return false;
}
-
- do_continue:
- ;
}
+ fixed_any = types_to_fix.Count > 0;
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;
- int arg_count;
- if (arguments != null)
- arg_count = arguments.Count;
- else
- arg_count = 0;
+ //
+ // 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");
- ParameterData pd = TypeManager.GetParameterData (method);
- if (arg_count != pd.Count)
+ ArrayList candidates = (ArrayList)bounds [i];
+ if (candidates == null)
return false;
- Type[] method_args = method.GetGenericArguments ();
+ 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;
- bool is_open = false;
- for (int i = 0; i < method_args.Length; i++) {
- if (method_args [i].IsGenericParameter) {
- is_open = true;
- break;
+ if (!Convert.ImplicitStandardConversionExists (candidate, (Type)candidates[cii])) {
+ failed = true;
+ }
}
- }
- // 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 (failed)
+ continue;
- Type[] inferred_types = new Type [method_args.Length];
+ if (best_candidate != null)
+ return false;
- Type[] param_types = new Type [pd.Count];
- Type[] arg_types = new Type [pd.Count];
+ best_candidate = candidate.Type;
+ }
- int lambdas = 0;
- for (int i = 0; i < arg_count; i++) {
- param_types [i] = pd.ParameterType (i);
+ if (best_candidate == null)
+ return false;
- Argument a = (Argument) arguments [i];
- if (a.Expr is LambdaExpression)
- lambdas++;
-
- if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr) ||
- (a.Expr is AnonymousMethodExpression))
- continue;
+ unfixed_types[i] = null;
+ fixed_types[i] = best_candidate;
+ return true;
+ }
- arg_types [i] = a.Type;
- }
+ public bool IsTypeNonDependent (MethodInfo mi, Type type)
+ {
+ if (IsUnfixed (type) < 0)
+ return false;
- if (!InferTypeArguments (param_types, arg_types, inferred_types)){
- Type it;
- if (lambdas == 0)
- return false;
-
- if (!LambdaInfer (ec, arguments, param_types, arg_types, inferred_types))
+ ParameterData d_parameters = TypeManager.GetParameterData (mi);
+ foreach (Type t in d_parameters.Types) {
+ if (!t.IsGenericParameter)
+ continue;
+
+ if (IsUnfixed (t) >= 0)
return false;
}
- method = ((MethodInfo)method).MakeGenericMethod (inferred_types);
return true;
}
- /// <summary>
- /// Type inference.
- /// </summary>
- public static bool InferTypeArguments (ParameterData apd,
- ref MethodBase method)
+ public int IsUnfixed (Type type)
{
- if (!TypeManager.IsGenericMethod (method))
- return true;
+ if (!type.IsGenericParameter)
+ return -1;
- ParameterData pd = TypeManager.GetParameterData (method);
- if (apd.Count != pd.Count)
- return false;
+ //return unfixed_types[type.GenericParameterPosition] != null;
+ for (int i = 0; i < unfixed_types.Length; ++i) {
+ if (unfixed_types [i] == type)
+ return i;
+ }
- Type[] method_args = method.GetGenericArguments ();
- Type[] inferred_types = new Type [method_args.Length];
+ return -1;
+ }
+
+ //
+ // 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);
- Type[] param_types = new Type [pd.Count];
- Type[] arg_types = new Type [pd.Count];
+ if (v.IsArray) {
+ if (u_dim != v.GetArrayRank ())
+ return;
+
+ v_e = TypeManager.GetElementType (v);
+
+ if (u.IsByRef) {
+ LowerBoundInference (u_e, v_e);
+ return;
+ }
+ ExactInference (u_e, v_e);
+ return;
+ }
+
+ if (u_dim != 1)
+ return;
- for (int i = 0; i < apd.Count; i++) {
- param_types [i] = pd.ParameterType (i);
- arg_types [i] = apd.ParameterType (i);
+ 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;
+
+ v_e = TypeManager.GetTypeArguments (v)[0];
+
+ 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;
+
+ v = v.GetGenericTypeDefinition ().MakeGenericType (ga_u);
+
+ // 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, inferred_types))
- return false;
+ // Remove ref, out modifiers
+ if (v.HasElementType)
+ v = v.GetElementType ();
- method = ((MethodInfo)method).MakeGenericMethod (inferred_types);
- return true;
+ // If V is one of the unfixed type arguments
+ int pos = IsUnfixed (v);
+ if (pos == -1)
+ return;
+
+ AddToBounds (u, pos);
+ }
+
+ //
+ // 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;
+ }
+
+ if (e is MethodGroupExpr) {
+ throw new NotImplementedException ();
+ }
+
+ //
+ // if e is an expression with type U, then
+ // a lower-bound inference is made from U for T
+ //
+ LowerBoundInference (e.Type, t);
+ }
+
+ static void RemoveDependentTypes (ArrayList types, Type returnType)
+ {
+ if (returnType.IsGenericParameter) {
+ types [returnType.GenericParameterPosition] = null;
+ return;
+ }
+
+ if (returnType.IsGenericType) {
+ foreach (Type t in returnType.GetGenericArguments ()) {
+ RemoveDependentTypes (types, t);
+ }
+ }
+ }
+
+ public bool UnfixedVariableExists {
+ get {
+ foreach (Type ut in unfixed_types)
+ if (ut != null)
+ return true;
+ return false;
+ }
}
}
projects / mono.git / blobdiff