using System.Globalization;
using System.Collections.Generic;
using System.Text;
-using System.Text.RegularExpressions;
+using System.Linq;
namespace Mono.CSharp {
+ public enum Variance
+ {
+ //
+ // Don't add or modify internal values, they are used as -/+ calculation signs
+ //
+ None = 0,
+ Covariant = 1,
+ Contravariant = -1
+ }
- /// <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;
- }
+ [Flags]
+ public enum SpecialConstraint
+ {
+ None = 0,
+ Constructor = 1 << 2,
+ Class = 1 << 3,
+ Struct = 1 << 4
+ }
- public abstract GenericParameterAttributes Attributes {
- get;
+ public class SpecialContraintExpr : FullNamedExpression
+ {
+ public SpecialContraintExpr (SpecialConstraint constraint, Location loc)
+ {
+ this.loc = loc;
+ this.Constraint = constraint;
}
- public bool HasConstructorConstraint {
- get { return (Attributes & GenericParameterAttributes.DefaultConstructorConstraint) != 0; }
- }
+ public SpecialConstraint Constraint { get; private set; }
- public bool HasReferenceTypeConstraint {
- get { return (Attributes & GenericParameterAttributes.ReferenceTypeConstraint) != 0; }
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ throw new NotImplementedException ();
}
+ }
- public bool HasValueTypeConstraint {
- get { return (Attributes & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0; }
+ //
+ // A set of parsed constraints for a type parameter
+ //
+ public class Constraints
+ {
+ SimpleMemberName tparam;
+ List<FullNamedExpression> constraints;
+ Location loc;
+ bool resolved;
+ bool resolving;
+
+ public Constraints (SimpleMemberName tparam, List<FullNamedExpression> constraints, Location loc)
+ {
+ this.tparam = tparam;
+ this.constraints = constraints;
+ this.loc = loc;
}
- public virtual bool HasClassConstraint {
- get { return ClassConstraint != null; }
+ #region Properties
+
+ public Location Location {
+ get {
+ return loc;
+ }
}
- public abstract Type ClassConstraint {
- get;
+ public SimpleMemberName TypeParameter {
+ get {
+ return tparam;
+ }
}
- public abstract Type[] InterfaceConstraints {
- get;
+ #endregion
+
+ bool CheckConflictingInheritedConstraint (TypeSpec ba, TypeSpec bb, IMemberContext context, Location loc)
+ {
+ if (!TypeSpec.IsBaseClass (ba, bb, false) && !TypeSpec.IsBaseClass (bb, ba, false)) {
+ context.Compiler.Report.Error (455, loc,
+ "Type parameter `{0}' inherits conflicting constraints `{1}' and `{2}'",
+ tparam.Value,
+ ba.GetSignatureForError (), bb.GetSignatureForError ());
+ return false;
+ }
+
+ return true;
}
- public abstract Type EffectiveBaseClass {
- get;
+ public void CheckGenericConstraints (IMemberContext context)
+ {
+ foreach (var c in constraints) {
+ var ge = c as GenericTypeExpr;
+ if (ge != null)
+ ge.CheckConstraints (context);
+ }
}
- // <summary>
- // Returns whether the type parameter is "known to be a reference type".
- // </summary>
- public virtual bool IsReferenceType {
- get {
- if (HasReferenceTypeConstraint)
- return true;
- if (HasValueTypeConstraint)
- return false;
+ //
+ // Resolve the constraints types with only possible early checks, return
+ // value `false' is reserved for recursive failure
+ //
+ public bool Resolve (IMemberContext context, TypeParameter tp)
+ {
+ if (resolved)
+ return true;
- if (ClassConstraint != null) {
- if (ClassConstraint.IsValueType)
- return false;
+ if (resolving)
+ return false;
- if (ClassConstraint != TypeManager.object_type)
- return true;
+ resolving = true;
+ var spec = tp.Type;
+ List<TypeParameterSpec> tparam_types = null;
+ bool iface_found = false;
+
+ spec.BaseType = TypeManager.object_type;
+
+ for (int i = 0; i < constraints.Count; ++i) {
+ var constraint = constraints[i];
+
+ if (constraint is SpecialContraintExpr) {
+ spec.SpecialConstraint |= ((SpecialContraintExpr) constraint).Constraint;
+ if (spec.HasSpecialStruct)
+ spec.BaseType = TypeManager.value_type;
+
+ // Set to null as it does not have a type
+ constraints[i] = null;
+ continue;
}
- foreach (Type t in InterfaceConstraints) {
- if (!t.IsGenericParameter)
- continue;
+ var type_expr = constraints[i] = constraint.ResolveAsTypeTerminal (context, false);
+ if (type_expr == null)
+ continue;
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
- if ((gc != null) && gc.IsReferenceType)
- return true;
+ var gexpr = type_expr as GenericTypeExpr;
+ if (gexpr != null && gexpr.HasDynamicArguments ()) {
+ context.Compiler.Report.Error (1968, constraint.Location,
+ "A constraint cannot be the dynamic type `{0}'", gexpr.GetSignatureForError ());
+ continue;
}
- return false;
- }
- }
+ var type = type_expr.Type;
- // <summary>
- // Returns whether the type parameter is "known to be a value type".
- // </summary>
- public virtual bool IsValueType {
- get {
- if (HasValueTypeConstraint)
- return true;
- if (HasReferenceTypeConstraint)
- return false;
+ if (!context.CurrentMemberDefinition.IsAccessibleAs (type)) {
+ context.Compiler.Report.SymbolRelatedToPreviousError (type);
+ context.Compiler.Report.Error (703, loc,
+ "Inconsistent accessibility: constraint type `{0}' is less accessible than `{1}'",
+ type.GetSignatureForError (), context.GetSignatureForError ());
+ }
- if (ClassConstraint != null) {
- if (!TypeManager.IsValueType (ClassConstraint))
- return false;
+ if (type.IsInterface) {
+ if (!spec.AddInterface (type)) {
+ context.Compiler.Report.Error (405, constraint.Location,
+ "Duplicate constraint `{0}' for type parameter `{1}'", type.GetSignatureForError (), tparam.Value);
+ }
- if (ClassConstraint != TypeManager.value_type)
- return true;
+ iface_found = true;
+ continue;
}
- foreach (Type t in InterfaceConstraints) {
- if (!t.IsGenericParameter)
+
+ var constraint_tp = type as TypeParameterSpec;
+ if (constraint_tp != null) {
+ if (tparam_types == null) {
+ tparam_types = new List<TypeParameterSpec> (2);
+ } else if (tparam_types.Contains (constraint_tp)) {
+ context.Compiler.Report.Error (405, constraint.Location,
+ "Duplicate constraint `{0}' for type parameter `{1}'", type.GetSignatureForError (), tparam.Value);
continue;
+ }
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
- if ((gc != null) && gc.IsValueType)
- return true;
+ //
+ // Checks whether each generic method parameter constraint type
+ // is valid with respect to T
+ //
+ if (tp.IsMethodTypeParameter) {
+ TypeManager.CheckTypeVariance (type, Variance.Contravariant, context);
+ }
+
+ var tp_def = constraint_tp.MemberDefinition as TypeParameter;
+ if (tp_def != null && !tp_def.ResolveConstraints (context)) {
+ context.Compiler.Report.Error (454, constraint.Location,
+ "Circular constraint dependency involving `{0}' and `{1}'",
+ constraint_tp.GetSignatureForError (), tp.GetSignatureForError ());
+ continue;
+ }
+
+ //
+ // Checks whether there are no conflicts between type parameter constraints
+ //
+ // class Foo<T, U>
+ // where T : A
+ // where U : B, T
+ //
+ // A and B are not convertible and only 1 class constraint is allowed
+ //
+ if (constraint_tp.HasTypeConstraint) {
+ if (spec.HasTypeConstraint || spec.HasSpecialStruct) {
+ if (!CheckConflictingInheritedConstraint (spec.BaseType, constraint_tp.BaseType, context, constraint.Location))
+ continue;
+ } else {
+ for (int ii = 0; ii < tparam_types.Count; ++ii) {
+ if (!tparam_types[ii].HasTypeConstraint)
+ continue;
+
+ if (!CheckConflictingInheritedConstraint (tparam_types[ii].BaseType, constraint_tp.BaseType, context, constraint.Location))
+ break;
+ }
+ }
+ }
+
+ if (constraint_tp.HasSpecialStruct) {
+ context.Compiler.Report.Error (456, constraint.Location,
+ "Type parameter `{0}' has the `struct' constraint, so it cannot be used as a constraint for `{1}'",
+ constraint_tp.GetSignatureForError (), tp.GetSignatureForError ());
+ continue;
+ }
+
+ tparam_types.Add (constraint_tp);
+ continue;
}
- return false;
+ if (iface_found || spec.HasTypeConstraint) {
+ context.Compiler.Report.Error (406, constraint.Location,
+ "The class type constraint `{0}' must be listed before any other constraints. Consider moving type constraint to the beginning of the constraint list",
+ type.GetSignatureForError ());
+ }
+
+ if (spec.HasSpecialStruct || spec.HasSpecialClass) {
+ context.Compiler.Report.Error (450, type_expr.Location,
+ "`{0}': cannot specify both a constraint class and the `class' or `struct' constraint",
+ type.GetSignatureForError ());
+ }
+
+ if (type == InternalType.Dynamic) {
+ context.Compiler.Report.Error (1967, constraint.Location, "A constraint cannot be the dynamic type");
+ continue;
+ }
+
+ if (type.IsSealed || !type.IsClass) {
+ context.Compiler.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 (type));
+ continue;
+ }
+
+ if (type.IsStatic) {
+ context.Compiler.Report.Error (717, constraint.Location,
+ "`{0}' is not a valid constraint. Static classes cannot be used as constraints",
+ type.GetSignatureForError ());
+ } else if (type == TypeManager.array_type || type == TypeManager.delegate_type ||
+ type == TypeManager.enum_type || type == TypeManager.value_type ||
+ type == TypeManager.object_type || type == TypeManager.multicast_delegate_type) {
+ context.Compiler.Report.Error (702, constraint.Location,
+ "A constraint cannot be special class `{0}'", type.GetSignatureForError ());
+ continue;
+ }
+
+ spec.BaseType = type;
+ }
+
+ if (tparam_types != null)
+ spec.TypeArguments = tparam_types.ToArray ();
+
+ resolving = false;
+ resolved = true;
+ return true;
+ }
+
+ public void VerifyClsCompliance (Report report)
+ {
+ foreach (var c in constraints)
+ {
+ if (c == null)
+ continue;
+
+ if (!c.Type.IsCLSCompliant ()) {
+ report.SymbolRelatedToPreviousError (c.Type);
+ report.Warning (3024, 1, loc, "Constraint type `{0}' is not CLS-compliant",
+ c.Type.GetSignatureForError ());
+ }
}
}
}
- public class ReflectionConstraints : GenericConstraints
+ //
+ // A type parameter for a generic type or generic method definition
+ //
+ public class TypeParameter : MemberCore, ITypeDefinition
{
- GenericParameterAttributes attrs;
- Type base_type;
- Type class_constraint;
- Type[] iface_constraints;
- string name;
+ static readonly string[] attribute_target = new string [] { "type parameter" };
+
+ Constraints constraints;
+ GenericTypeParameterBuilder builder;
+ TypeParameterSpec spec;
- public static GenericConstraints GetConstraints (Type t)
+ public TypeParameter (DeclSpace parent, int index, MemberName name, Constraints constraints, Attributes attrs, Variance variance)
+ : base (parent, name, attrs)
{
- Type[] constraints = t.GetGenericParameterConstraints ();
- GenericParameterAttributes attrs = t.GenericParameterAttributes;
- if (constraints.Length == 0 && attrs == GenericParameterAttributes.None)
- return null;
- return new ReflectionConstraints (t.Name, constraints, attrs);
+ this.constraints = constraints;
+ this.spec = new TypeParameterSpec (null, index, this, SpecialConstraint.None, variance, null);
}
- private ReflectionConstraints (string name, Type[] constraints, GenericParameterAttributes attrs)
+ public TypeParameter (TypeParameterSpec spec, DeclSpace parent, TypeSpec parentSpec, MemberName name, Attributes attrs)
+ : base (parent, name, attrs)
{
- this.name = name;
- this.attrs = attrs;
+ this.spec = new TypeParameterSpec (parentSpec, spec.DeclaredPosition, spec.MemberDefinition, spec.SpecialConstraint, spec.Variance, null) {
+ BaseType = spec.BaseType,
+ InterfacesDefined = spec.InterfacesDefined,
+ TypeArguments = spec.TypeArguments
+ };
+ }
- int interface_constraints_pos = 0;
- if ((attrs & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
- base_type = TypeManager.value_type;
- interface_constraints_pos = 1;
- } else if ((attrs & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
- if (constraints.Length > 0 && constraints[0].IsClass) {
- class_constraint = base_type = constraints[0];
- interface_constraints_pos = 1;
- } else {
- base_type = TypeManager.object_type;
- }
- } else {
- base_type = TypeManager.object_type;
+ #region Properties
+
+ public override AttributeTargets AttributeTargets {
+ get {
+ return AttributeTargets.GenericParameter;
}
+ }
- if (constraints.Length > interface_constraints_pos) {
- if (interface_constraints_pos == 0) {
- iface_constraints = constraints;
- } else {
- iface_constraints = new Type[constraints.Length - interface_constraints_pos];
- Array.Copy (constraints, interface_constraints_pos, iface_constraints, 0, iface_constraints.Length);
- }
- } else {
- iface_constraints = Type.EmptyTypes;
+ public override string DocCommentHeader {
+ get {
+ throw new InvalidOperationException (
+ "Unexpected attempt to get doc comment from " + this.GetType ());
+ }
+ }
+
+ public bool IsMethodTypeParameter {
+ get {
+ return spec.IsMethodOwned;
+ }
+ }
+
+ public string Namespace {
+ get {
+ return null;
+ }
+ }
+
+ public TypeParameterSpec Type {
+ get {
+ return spec;
+ }
+ }
+
+ public int TypeParametersCount {
+ get {
+ return 0;
+ }
+ }
+
+ public TypeParameterSpec[] TypeParameters {
+ get {
+ return null;
+ }
+ }
+
+ public override string[] ValidAttributeTargets {
+ get {
+ return attribute_target;
+ }
+ }
+
+ public Variance Variance {
+ get {
+ return spec.Variance;
+ }
+ }
+
+ #endregion
+
+ //
+ // This is called for each part of a partial generic type definition.
+ //
+ // If partial type parameters constraints are 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.
+ //
+ public bool AddPartialConstraints (TypeContainer part, TypeParameter tp)
+ {
+ if (builder == null)
+ throw new InvalidOperationException ();
+
+ var new_constraints = tp.constraints;
+ if (new_constraints == null)
+ return true;
+
+ // TODO: could create spec only
+ //tp.Define (null, -1, part.Definition);
+ tp.spec.DeclaringType = part.Definition;
+ if (!tp.ResolveConstraints (part))
+ return false;
+
+ if (constraints != null)
+ return spec.HasSameConstraintsDefinition (tp.Type);
+
+ // Copy constraint from resolved part to partial container
+ spec.SpecialConstraint = tp.spec.SpecialConstraint;
+ spec.InterfacesDefined = tp.spec.InterfacesDefined;
+ spec.TypeArguments = tp.spec.TypeArguments;
+ spec.BaseType = tp.spec.BaseType;
+
+ return true;
+ }
+
+ public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
+ {
+ builder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
+ }
+
+ public void CheckGenericConstraints ()
+ {
+ if (constraints != null)
+ constraints.CheckGenericConstraints (this);
+ }
+
+ public TypeParameter CreateHoistedCopy (TypeContainer declaringType, TypeSpec declaringSpec)
+ {
+ return new TypeParameter (spec, declaringType, declaringSpec, MemberName, null);
+ }
+
+ public override bool Define ()
+ {
+ return true;
+ }
+
+ //
+ // 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).
+ //
+ public void Define (GenericTypeParameterBuilder type, TypeSpec declaringType)
+ {
+ if (builder != null)
+ throw new InternalErrorException ();
+
+ this.builder = type;
+ spec.DeclaringType = declaringType;
+ spec.SetMetaInfo (type);
+ }
+
+ public void EmitConstraints (GenericTypeParameterBuilder builder)
+ {
+ var attr = GenericParameterAttributes.None;
+ if (spec.Variance == Variance.Contravariant)
+ attr |= GenericParameterAttributes.Contravariant;
+ else if (spec.Variance == Variance.Covariant)
+ attr |= GenericParameterAttributes.Covariant;
+
+ if (spec.HasSpecialClass)
+ attr |= GenericParameterAttributes.ReferenceTypeConstraint;
+ else if (spec.HasSpecialStruct)
+ attr |= GenericParameterAttributes.NotNullableValueTypeConstraint | GenericParameterAttributes.DefaultConstructorConstraint;
+
+ if (spec.HasSpecialConstructor)
+ attr |= GenericParameterAttributes.DefaultConstructorConstraint;
+
+ if (spec.BaseType != TypeManager.object_type)
+ builder.SetBaseTypeConstraint (spec.BaseType.GetMetaInfo ());
+
+ if (spec.InterfacesDefined != null)
+ builder.SetInterfaceConstraints (spec.InterfacesDefined.Select (l => l.GetMetaInfo ()).ToArray ());
+
+ if (spec.TypeArguments != null)
+ builder.SetInterfaceConstraints (spec.TypeArguments.Select (l => l.GetMetaInfo ()).ToArray ());
+
+ builder.SetGenericParameterAttributes (attr);
+ }
+
+ public override void Emit ()
+ {
+ EmitConstraints (builder);
+
+ if (OptAttributes != null)
+ OptAttributes.Emit ();
+
+ base.Emit ();
+ }
+
+ public void ErrorInvalidVariance (IMemberContext mc, Variance expected)
+ {
+ Report.SymbolRelatedToPreviousError (mc.CurrentMemberDefinition);
+ string input_variance = Variance == Variance.Contravariant ? "contravariant" : "covariant";
+ string gtype_variance;
+ switch (expected) {
+ case Variance.Contravariant: gtype_variance = "contravariantly"; break;
+ case Variance.Covariant: gtype_variance = "covariantly"; break;
+ default: gtype_variance = "invariantly"; break;
}
+
+ Delegate d = mc as Delegate;
+ string parameters = d != null ? d.Parameters.GetSignatureForError () : "";
+
+ Report.Error (1961, Location,
+ "The {2} type parameter `{0}' must be {3} valid on `{1}{4}'",
+ GetSignatureForError (), mc.GetSignatureForError (), input_variance, gtype_variance, parameters);
}
- public override string TypeParameter
- {
- get { return name; }
- }
+ public TypeSpec GetAttributeCoClass ()
+ {
+ return null;
+ }
+
+ public string GetAttributeDefaultMember ()
+ {
+ throw new NotSupportedException ();
+ }
+
+ public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
+ {
+ throw new NotSupportedException ();
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return MemberName.Name;
+ }
+
+ public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
+ {
+ throw new NotSupportedException ("Not supported for compiled definition");
+ }
+
+ //
+ // Resolves all type parameter constraints
+ //
+ public bool ResolveConstraints (IMemberContext context)
+ {
+ if (constraints != null)
+ return constraints.Resolve (context, this);
+
+ if (spec.BaseType == null)
+ spec.BaseType = TypeManager.object_type;
- public override GenericParameterAttributes Attributes
- {
- get { return attrs; }
+ return true;
}
- public override Type ClassConstraint
+ public static TypeParameter FindTypeParameter (TypeParameter[] tparams, string name)
{
- get { return class_constraint; }
+ foreach (var tp in tparams) {
+ if (tp.Name == name)
+ return tp;
+ }
+
+ return null;
}
- public override Type EffectiveBaseClass
+ public override bool IsClsComplianceRequired ()
{
- get { return base_type; }
+ return false;
}
- public override Type[] InterfaceConstraints
+ public new void VerifyClsCompliance ()
{
- get { return iface_constraints; }
+ if (constraints != null)
+ constraints.VerifyClsCompliance (Report);
}
}
- public enum Variance
+ [System.Diagnostics.DebuggerDisplay ("{DisplayDebugInfo()}")]
+ public class TypeParameterSpec : TypeSpec
{
+ public static readonly new TypeParameterSpec[] EmptyTypes = new TypeParameterSpec[0];
+
+ Variance variance;
+ SpecialConstraint spec;
+ readonly int tp_pos;
+ TypeSpec[] targs;
+ TypeSpec[] ifaces_defined;
+
//
- // Don't add or modify internal values, they are used as -/+ calculation signs
+ // Creates type owned type parameter
//
- None = 0,
- Covariant = 1,
- Contravariant = -1
- }
-
- public enum SpecialConstraint
- {
- Constructor,
- ReferenceType,
- ValueType
- }
+ public TypeParameterSpec (TypeSpec declaringType, int index, ITypeDefinition definition, SpecialConstraint spec, Variance variance, Type info)
+ : base (MemberKind.TypeParameter, declaringType, definition, info, Modifiers.PUBLIC)
+ {
+ this.variance = variance;
+ this.spec = spec;
+ state &= ~StateFlags.Obsolete_Undetected;
+ tp_pos = index;
+ }
- /// <summary>
- /// Tracks the constraints for a type parameter from a generic type definition.
- /// </summary>
- public class Constraints : GenericConstraints {
- string name;
- List<object> 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, List<object> constraints, Location loc)
+ // Creates method owned type parameter
+ //
+ public TypeParameterSpec (int index, ITypeDefinition definition, SpecialConstraint spec, Variance variance, Type info)
+ : this (null, index, definition, spec, variance, info)
{
- this.name = name;
- this.constraints = constraints;
- this.loc = loc;
}
- public override string TypeParameter {
+ #region Properties
+
+ public int DeclaredPosition {
get {
- return name;
+ return tp_pos;
}
}
- public Constraints Clone ()
- {
- return new Constraints (name, constraints, loc);
+ public bool HasSpecialConstructor {
+ get {
+ return (spec & SpecialConstraint.Constructor) != 0;
+ }
}
- GenericParameterAttributes attrs;
- TypeExpr class_constraint;
- List<TypeExpr> iface_constraints;
- List<TypeExpr> 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 (MemberCore ec, TypeParameter tp, Report Report)
- {
- if (resolved)
- return true;
-
- if (ec == null)
- return false;
-
- iface_constraints = new List<TypeExpr> (2); // TODO: Too expensive allocation
- type_param_constraints = new List<TypeExpr> ();
+ public bool HasSpecialClass {
+ get {
+ return (spec & SpecialConstraint.Class) != 0;
+ }
+ }
- foreach (object obj in constraints) {
- if (HasConstructorConstraint) {
- Report.Error (401, loc,
- "The new() constraint must be the last constraint specified");
- return false;
- }
+ public bool HasSpecialStruct {
+ get {
+ return (spec & SpecialConstraint.Struct) != 0;
+ }
+ }
- if (obj is SpecialConstraint) {
- SpecialConstraint sc = (SpecialConstraint) obj;
+ public bool HasTypeConstraint {
+ get {
+ return BaseType != TypeManager.object_type && BaseType != TypeManager.value_type;
+ }
+ }
- if (sc == SpecialConstraint.Constructor) {
- if (!HasValueTypeConstraint) {
- attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
- continue;
+ public override IList<TypeSpec> Interfaces {
+ get {
+ if ((state & StateFlags.InterfacesExpanded) == 0) {
+ if (ifaces != null) {
+ for (int i = 0; i < ifaces.Count; ++i ) {
+ var iface_type = ifaces[i];
+ if (iface_type.Interfaces != null) {
+ if (ifaces_defined == null)
+ ifaces_defined = ifaces.ToArray ();
+
+ for (int ii = 0; ii < iface_type.Interfaces.Count; ++ii) {
+ var ii_iface_type = iface_type.Interfaces [ii];
+
+ AddInterface (ii_iface_type);
+ }
+ }
}
-
- 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 (ifaces_defined == null && ifaces != null)
+ ifaces_defined = ifaces.ToArray ();
- if (sc == SpecialConstraint.ReferenceType)
- attrs |= GenericParameterAttributes.ReferenceTypeConstraint;
- else
- attrs |= GenericParameterAttributes.NotNullableValueTypeConstraint;
- continue;
+ state |= StateFlags.InterfacesExpanded;
}
- int errors = Report.Errors;
- FullNamedExpression fn = ((Expression) obj).ResolveAsTypeStep (ec, false);
+ return ifaces;
+ }
+ }
- if (fn == null) {
- if (errors != Report.Errors)
- return false;
+ //
+ // Unexpanded interfaces list
+ //
+ public TypeSpec[] InterfacesDefined {
+ get {
+ if (ifaces_defined == null && ifaces != null)
+ ifaces_defined = ifaces.ToArray ();
- NamespaceEntry.Error_NamespaceNotFound (loc, ((Expression)obj).GetSignatureForError (), Report);
- return false;
- }
+ return ifaces_defined;
+ }
+ set {
+ ifaces_defined = value;
+ }
+ }
- TypeExpr expr;
- GenericTypeExpr cexpr = fn as GenericTypeExpr;
- if (cexpr != null) {
- expr = cexpr.ResolveAsBaseTerminal (ec, false);
- if (expr != null && cexpr.HasDynamicArguments ()) {
- Report.Error (1968, cexpr.Location,
- "A constraint cannot be the dynamic type `{0}'",
- cexpr.GetSignatureForError ());
- expr = null;
- }
- } else
- expr = ((Expression) obj).ResolveAsTypeTerminal (ec, false);
+ public bool IsConstrained {
+ get {
+ return spec != SpecialConstraint.None || ifaces != null || targs != null || HasTypeConstraint;
+ }
+ }
- if ((expr == null) || (expr.Type == null))
- return false;
+ //
+ // Returns whether the type parameter is "known to be a reference type"
+ //
+ public bool IsReferenceType {
+ get {
+ return (spec & SpecialConstraint.Class) != 0 || HasTypeConstraint;
+ }
+ }
- if (TypeManager.IsGenericParameter (expr.Type))
- 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;
+ public bool IsValueType { // TODO: Do I need this ?
+ get {
+ // TODO MemberCache: probably wrong
+ return HasSpecialStruct;
+ }
+ }
+ public override string Name {
+ get {
+ return definition.Name;
+ }
+ }
- //
- // Checks whether each generic method parameter constraint type
- // is valid with respect to T
- //
- if (tp != null && tp.Type.DeclaringMethod != null) {
- TypeManager.CheckTypeVariance (expr.Type, Variance.Contravariant, ec as MemberCore);
- }
+ public bool IsMethodOwned {
+ get {
+ return DeclaringType == null;
+ }
+ }
- if (!ec.IsAccessibleAs (fn.Type)) {
- Report.SymbolRelatedToPreviousError (fn.Type);
- Report.Error (703, loc,
- "Inconsistent accessibility: constraint type `{0}' is less accessible than `{1}'",
- fn.GetSignatureForError (), ec.GetSignatureForError ());
- }
+ public SpecialConstraint SpecialConstraint {
+ get {
+ return spec;
+ }
+ set {
+ spec = value;
+ }
+ }
- num_constraints++;
+ //
+ // Types used to inflate the generic type
+ //
+ public new TypeSpec[] TypeArguments {
+ get {
+ return targs;
}
+ set {
+ targs = value;
+ }
+ }
- var list = new List<Type> ();
- foreach (TypeExpr iface_constraint in iface_constraints) {
- foreach (Type type in list) {
- if (!type.Equals (iface_constraint.Type))
- continue;
+ public Variance Variance {
+ get {
+ return variance;
+ }
+ }
- Report.Error (405, loc,
- "Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", iface_constraint.GetSignatureForError (),
- name);
- return false;
- }
+ #endregion
- list.Add (iface_constraint.Type);
- }
+ public string DisplayDebugInfo ()
+ {
+ var s = GetSignatureForError ();
+ return IsMethodOwned ? s + "!!" : s + "!";
+ }
- foreach (TypeExpr expr in type_param_constraints) {
- foreach (Type type in list) {
- if (!type.Equals (expr.Type))
- continue;
+ //
+ // Finds effective base class
+ //
+ public TypeSpec GetEffectiveBase ()
+ {
+ if (HasSpecialStruct) {
+ return TypeManager.value_type;
+ }
- Report.Error (405, loc,
- "Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", expr.GetSignatureForError (), name);
- return false;
- }
+ if (BaseType != null && targs == null)
+ return BaseType;
- list.Add (expr.Type);
+ var types = targs;
+ if (HasTypeConstraint) {
+ Array.Resize (ref types, types.Length + 1);
+ types[types.Length - 1] = BaseType;
}
- iface_constraint_types = new Type [list.Count];
- list.CopyTo (iface_constraint_types, 0);
+ if (types != null)
+ return Convert.FindMostEncompassedType (types.Select (l => l.BaseType));
- if (class_constraint != null) {
- class_constraint_type = class_constraint.Type;
- if (class_constraint_type == null)
- return false;
+ return TypeManager.object_type;
+ }
- 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;
- }
+ public override string GetSignatureForError ()
+ {
+ return Name;
+ }
- 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;
- }
+ //
+ // Constraints have to match by definition but not position, used by
+ // partial classes or methods
+ //
+ public bool HasSameConstraintsDefinition (TypeParameterSpec other)
+ {
+ if (spec != other.spec)
+ return false;
- if (TypeManager.IsDynamicType (class_constraint_type)) {
- Report.Error (1967, loc, "A constraint cannot be the dynamic type");
- return false;
- }
- }
+ if (BaseType != other.BaseType)
+ 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 (!TypeSpecComparer.Override.IsSame (InterfacesDefined, other.InterfacesDefined))
+ return false;
- if ((attrs & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0)
- attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
+ if (!TypeSpecComparer.Override.IsSame (targs, other.targs))
+ return false;
- resolved = true;
return true;
}
- bool CheckTypeParameterConstraints (Type tparam, ref TypeExpr prevConstraint, List<Type> seen, Report Report)
+ //
+ // Constraints have to match by using same set of types, used by
+ // implicit interface implementation
+ //
+ public bool HasSameConstraintsImplementation (TypeParameterSpec other)
{
- seen.Add (tparam);
-
- Constraints constraints = TypeManager.LookupTypeParameter (tparam).Constraints;
- if (constraints == null)
- return true;
-
- 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);
+ if (spec != other.spec)
return false;
- }
//
- // Checks whether there are no conflicts between type parameter constraints
+ // It can be same base type or inflated type parameter
//
- // class Foo<T, U>
- // where T : A
- // where U : A, B // A and B are not convertible
+ // interface I<T> { void Foo<U> where U : T; }
+ // class A : I<int> { void Foo<X> where X : int {} }
//
- if (constraints.HasClassConstraint) {
- if (prevConstraint != null) {
- Type t2 = constraints.ClassConstraint;
- TypeExpr e2 = constraints.class_constraint;
-
- 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;
- }
- }
-
- prevConstraint = constraints.class_constraint;
- }
-
- if (constraints.type_param_constraints == null)
- return true;
-
- foreach (TypeExpr expr in constraints.type_param_constraints) {
- if (seen.Contains (expr.Type)) {
- Report.Error (454, loc, "Circular constraint " +
- "dependency involving `{0}' and `{1}'",
- tparam.Name, expr.GetSignatureForError ());
+ bool found;
+ if (!TypeSpecComparer.Override.IsEqual (BaseType, other.BaseType)) {
+ if (other.targs == null)
return false;
+
+ found = false;
+ foreach (var otarg in other.targs) {
+ if (TypeSpecComparer.Override.IsEqual (BaseType, otarg)) {
+ found = true;
+ break;
+ }
}
- if (!CheckTypeParameterConstraints (expr.Type, ref prevConstraint, seen, Report))
+ if (!found)
return false;
}
- return true;
- }
+ // Check interfaces implementation -> definition
+ if (InterfacesDefined != null) {
+ foreach (var iface in InterfacesDefined) {
+ found = false;
+ if (other.InterfacesDefined != null) {
+ foreach (var oiface in other.InterfacesDefined) {
+ if (TypeSpecComparer.Override.IsEqual (iface, oiface)) {
+ found = true;
+ break;
+ }
+ }
+ }
- /// <summary>
- /// Resolve the constraints into actual types.
- /// </summary>
- public bool ResolveTypes (IMemberContext ec, Report r)
- {
- if (resolved_types)
- return true;
+ if (found)
+ continue;
- resolved_types = true;
+ if (other.targs != null) {
+ foreach (var otarg in other.targs) {
+ if (TypeSpecComparer.Override.IsEqual (BaseType, otarg)) {
+ found = true;
+ break;
+ }
+ }
+ }
- foreach (object obj in constraints) {
- GenericTypeExpr cexpr = obj as GenericTypeExpr;
- if (cexpr == null)
- continue;
+ if (!found)
+ return false;
+ }
+ }
- if (!cexpr.CheckConstraints (ec))
+ // Check interfaces implementation <- definition
+ if (other.InterfacesDefined != null) {
+ if (InterfacesDefined == null)
return false;
- }
- if (type_param_constraints.Count != 0) {
- var seen = new List<Type> ();
- TypeExpr prev_constraint = class_constraint;
- foreach (TypeExpr expr in type_param_constraints) {
- if (!CheckTypeParameterConstraints (expr.Type, ref prev_constraint, seen, r))
+ foreach (var oiface in other.InterfacesDefined) {
+ found = false;
+ foreach (var iface in InterfacesDefined) {
+ if (TypeSpecComparer.Override.IsEqual (iface, oiface)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
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)
+ // Check type parameters implementation -> definition
+ if (targs != null) {
+ if (other.targs == 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;
- }
+ foreach (var targ in targs) {
+ found = false;
+ foreach (var otarg in other.targs) {
+ if (TypeSpecComparer.Override.IsEqual (targ, otarg)) {
+ found = true;
+ break;
+ }
+ }
- return true;
- }
+ if (!found)
+ return false;
+ }
+ }
- public override GenericParameterAttributes Attributes {
- get { return attrs; }
- }
+ // Check type parameters implementation <- definition
+ if (other.targs != null) {
+ foreach (var otarg in other.targs) {
+ // Ignore inflated type arguments, were checked above
+ if (!otarg.IsGenericParameter)
+ continue;
- public override bool HasClassConstraint {
- get { return class_constraint != null; }
- }
+ if (targs == null)
+ return false;
- public override Type ClassConstraint {
- get { return class_constraint_type; }
- }
+ found = false;
+ foreach (var targ in targs) {
+ if (TypeSpecComparer.Override.IsEqual (targ, otarg)) {
+ found = true;
+ break;
+ }
+ }
- public override Type[] InterfaceConstraints {
- get { return iface_constraint_types; }
- }
+ if (!found)
+ return false;
+ }
+ }
- public override Type EffectiveBaseClass {
- get { return effective_base_type; }
+ return true;
}
- public bool IsSubclassOf (Type t)
+ public static TypeParameterSpec[] InflateConstraints (TypeParameterInflator inflator, TypeParameterSpec[] tparams)
{
- if ((class_constraint_type != null) &&
- class_constraint_type.IsSubclassOf (t))
- return true;
+ TypeParameterSpec[] constraints = null;
- if (iface_constraint_types == null)
- return false;
+ for (int i = 0; i < tparams.Length; ++i) {
+ var tp = tparams[i];
+ if (tp.HasTypeConstraint || tp.Interfaces != null || tp.TypeArguments != null) {
+ if (constraints == null) {
+ constraints = new TypeParameterSpec[tparams.Length];
+ Array.Copy (tparams, constraints, constraints.Length);
+ }
- foreach (Type iface in iface_constraint_types) {
- if (TypeManager.IsSubclassOf (iface, t))
- return true;
+ constraints[i] = (TypeParameterSpec) constraints[i].InflateMember (inflator);
+ }
}
- return false;
- }
+ if (constraints == null)
+ constraints = tparams;
- public Location Location {
- get {
- return loc;
- }
+ return constraints;
}
- /// <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)
+ public void InflateConstraints (TypeParameterInflator inflator, TypeParameterSpec tps)
{
- if (gc.Attributes != attrs)
- return false;
-
- if (HasClassConstraint != gc.HasClassConstraint)
- return false;
- if (HasClassConstraint && !TypeManager.IsEqual (gc.ClassConstraint, ClassConstraint))
- return false;
-
- int gc_icount = gc.InterfaceConstraints != null ?
- gc.InterfaceConstraints.Length : 0;
- int icount = InterfaceConstraints != null ?
- InterfaceConstraints.Length : 0;
-
- 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; ii < InterfaceConstraints.Length; ii++) {
- Type check = InterfaceConstraints [ii];
- if (check.IsGenericType)
- check = check.GetGenericTypeDefinition ();
-
- if (TypeManager.IsEqual (iface, check)) {
- ok = true;
- break;
- }
- }
-
- if (!ok)
- return false;
+ tps.BaseType = inflator.Inflate (BaseType);
+ if (ifaces != null) {
+ tps.ifaces = new List<TypeSpec> (ifaces.Count);
+ for (int i = 0; i < ifaces.Count; ++i)
+ tps.ifaces.Add (inflator.Inflate (ifaces[i]));
+ }
+ if (targs != null) {
+ tps.targs = new TypeSpec[targs.Length];
+ for (int i = 0; i < targs.Length; ++i)
+ tps.targs[i] = inflator.Inflate (targs[i]);
}
+ }
- return true;
+ public override MemberSpec InflateMember (TypeParameterInflator inflator)
+ {
+ var tps = (TypeParameterSpec) MemberwiseClone ();
+ InflateConstraints (inflator, tps);
+ return tps;
+ }
+
+ //
+ // Populates type parameter members using type parameter constraints
+ // The trick here is to be called late enough but not too late to
+ // populate member cache with all members from other types
+ //
+ protected override void InitializeMemberCache (bool onlyTypes)
+ {
+ cache = new MemberCache ();
+ if (ifaces != null) {
+ foreach (var iface_type in Interfaces) {
+ cache.AddInterface (iface_type);
+ }
+ }
}
- public void VerifyClsCompliance (Report r)
+ public bool IsConvertibleToInterface (TypeSpec iface)
{
- if (class_constraint_type != null && !AttributeTester.IsClsCompliant (class_constraint_type))
- Warning_ConstrainIsNotClsCompliant (class_constraint_type, class_constraint.Location, r);
+ if (Interfaces != null) {
+ foreach (var t in Interfaces) {
+ if (t == iface)
+ return true;
+ }
+ }
- 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, r);
+ if (TypeArguments != null) {
+ foreach (var t in TypeArguments) {
+ if (((TypeParameterSpec) t).IsConvertibleToInterface (iface))
+ return true;
}
}
+
+ return false;
}
- void Warning_ConstrainIsNotClsCompliant (Type t, Location loc, Report Report)
+ public override TypeSpec Mutate (TypeParameterMutator mutator)
{
- Report.SymbolRelatedToPreviousError (t);
- Report.Warning (3024, 1, loc, "Constraint type `{0}' is not CLS-compliant",
- TypeManager.CSharpName (t));
+ return mutator.Mutate (this);
}
}
- /// <summary>
- /// A type parameter from a generic type definition.
- /// </summary>
- public class TypeParameter : MemberCore, IMemberContainer
+ public struct TypeParameterInflator
{
- static readonly string[] attribute_target = new string [] { "type parameter" };
-
- DeclSpace decl;
- GenericConstraints gc;
- Constraints constraints;
- GenericTypeParameterBuilder type;
- MemberCache member_cache;
- Variance variance;
+ readonly TypeSpec type;
+ readonly TypeParameterSpec[] tparams;
+ readonly TypeSpec[] targs;
- public TypeParameter (DeclSpace parent, DeclSpace decl, string name,
- Constraints constraints, Attributes attrs, Variance variance, Location loc)
- : base (parent, new MemberName (name, loc), attrs)
+ public TypeParameterInflator (TypeParameterInflator nested, TypeSpec type)
+ : this (type, nested.tparams, nested.targs)
{
- this.decl = decl;
- this.constraints = constraints;
- this.variance = variance;
}
- public GenericConstraints GenericConstraints {
- get { return gc != null ? gc : constraints; }
- }
-
- public Constraints Constraints {
- get { return constraints; }
- }
-
- public DeclSpace DeclSpace {
- get { return decl; }
- }
+ public TypeParameterInflator (TypeSpec type, TypeParameterSpec[] tparams, TypeSpec[] targs)
+ {
+ if (tparams.Length != targs.Length)
+ throw new ArgumentException ("Invalid arguments");
- public Variance Variance {
- get { return variance; }
+ this.tparams = tparams;
+ this.targs = targs;
+ this.type = type;
}
- public Type Type {
- get { return type; }
+ //
+ // Type parameters to inflate
+ //
+ public TypeParameterSpec[] TypeParameters {
+ get {
+ return tparams;
+ }
}
- /// <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)
+ public TypeSpec Inflate (TypeSpec ts)
{
- if (this.type != null)
- throw new InvalidOperationException ();
+ var tp = ts as TypeParameterSpec;
+ if (tp != null)
+ return Inflate (tp);
- this.type = type;
- TypeManager.AddTypeParameter (type, this);
- }
+ var ac = ts as ArrayContainer;
+ if (ac != null) {
+ var et = Inflate (ac.Element);
+ if (et != ac.Element)
+ return ArrayContainer.MakeType (et, ac.Rank);
- public void ErrorInvalidVariance (IMemberContext mc, Variance expected)
- {
-// TODO: Report.SymbolRelatedToPreviousError (mc);
- string input_variance = Variance == Variance.Contravariant ? "contravariant" : "covariant";
- string gtype_variance;
- switch (expected) {
- case Variance.Contravariant: gtype_variance = "contravariantly"; break;
- case Variance.Covariant: gtype_variance = "covariantly"; break;
- default: gtype_variance = "invariantly"; break;
+ return ac;
}
- Delegate d = mc as Delegate;
- string parameters = d != null ? d.Parameters.GetSignatureForError () : "";
+ //
+ // When inflating a nested type, inflate its parent first
+ // in case it's using same type parameters (was inflated within the type)
+ //
+ if (ts.IsNested) {
+ var parent = Inflate (ts.DeclaringType);
+ if (ts.DeclaringType != parent) {
+ //
+ // Keep the inflated type arguments
+ //
+ var targs = ts.TypeArguments;
- Report.Error (1961, Location,
- "The {2} type parameter `{0}' must be {3} valid on `{1}{4}'",
- GetSignatureForError (), mc.GetSignatureForError (), input_variance, gtype_variance, parameters);
- }
+ //
+ // Parent was inflated, find the same type on inflated type
+ // to use same cache for nested types on same generic parent
+ //
+ // TODO: Should use BindingRestriction.DeclaredOnly or GetMember
+ ts = MemberCache.FindNestedType (parent, ts.Name, ts.Arity);
- /// <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, this, Report)) {
- constraints = null;
- return false;
- }
- }
+ //
+ // Handle the tricky case where parent shares local type arguments
+ // which means inflating inflated type
+ //
+ // class Test<T> {
+ // public static Nested<T> Foo () { return null; }
+ //
+ // public class Nested<U> {}
+ // }
+ //
+ // return type of Test<string>.Foo() has to be Test<string>.Nested<string>
+ //
+ if (targs.Length > 0) {
+ var inflated_targs = new TypeSpec [targs.Length];
+ for (var i = 0; i < targs.Length; ++i)
+ inflated_targs[i] = Inflate (targs[i]);
- return true;
- }
+ ts = ts.MakeGenericType (inflated_targs);
+ }
- /// <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 (IMemberContext ec)
- {
- if (constraints != null) {
- if (!constraints.ResolveTypes (ec, Report)) {
- constraints = null;
- return false;
+ return ts;
}
}
- return true;
+ // Inflate generic type
+ if (ts.Arity > 0)
+ return InflateTypeParameters (ts);
+
+ return ts;
}
- /// <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 (IMemberContext ec)
+ public TypeSpec Inflate (TypeParameterSpec tp)
{
- return DefineType (ec, null, null, false);
+ for (int i = 0; i < tparams.Length; ++i)
+ if (tparams [i] == tp)
+ return targs[i];
+
+ // This can happen when inflating nested types
+ // without type arguments specified
+ return tp;
}
- /// <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 (IMemberContext ec, MethodBuilder builder,
- MethodInfo implementing, bool is_override)
+ //
+ // Inflates generic types
+ //
+ TypeSpec InflateTypeParameters (TypeSpec type)
{
- if (!ResolveType (ec))
- return false;
+ var targs = new TypeSpec[type.Arity];
+ var i = 0;
- 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;
- }
+ var gti = type as InflatedTypeSpec;
- MethodBase mb = TypeManager.DropGenericMethodArguments (implementing);
+ //
+ // Inflating using outside type arguments, var v = new Foo<int> (), class Foo<T> {}
+ //
+ if (gti != null) {
+ for (; i < targs.Length; ++i)
+ targs[i] = Inflate (gti.TypeArguments[i]);
- int pos = type.GenericParameterPosition;
- Type mparam = mb.GetGenericArguments () [pos];
- GenericConstraints temp_gc = ReflectionConstraints.GetConstraints (mparam);
+ return gti.GetDefinition ().MakeGenericType (targs);
+ }
- if (temp_gc != null)
- gc = new InflatedConstraints (temp_gc, implementing.DeclaringType);
- else if (constraints != null)
- gc = new InflatedConstraints (constraints, implementing.DeclaringType);
+ //
+ // Inflating parent using inside type arguments, class Foo<T> { ITest<T> foo; }
+ //
+ var args = type.MemberDefinition.TypeParameters;
+ foreach (var ds_tp in args)
+ targs[i++] = Inflate (ds_tp);
- 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;
- }
+ return type.MakeGenericType (targs);
+ }
- if (!ok) {
- Report.SymbolRelatedToPreviousError (implementing);
+ public TypeSpec TypeInstance {
+ get { return type; }
+ }
+ }
- 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;
+ //
+ // Before emitting any code we have to change all MVAR references to VAR
+ // when the method is of generic type and has hoisted variables
+ //
+ public class TypeParameterMutator
+ {
+ TypeParameter[] mvar;
+ TypeParameter[] var;
+ Dictionary<TypeSpec, TypeSpec> mutated_typespec = new Dictionary<TypeSpec, TypeSpec> ();
- if (constraints != null)
- gc = new InflatedConstraints (constraints, types);
- } else {
- gc = (GenericConstraints) constraints;
- }
+ public TypeParameterMutator (TypeParameter[] mvar, TypeParameter[] var)
+ {
+ if (mvar.Length != var.Length)
+ throw new ArgumentException ();
- SetConstraints (type);
- return true;
+ this.mvar = mvar;
+ this.var = var;
}
- public static TypeParameter FindTypeParameter (TypeParameter[] tparams, string name)
- {
- foreach (var tp in tparams) {
- if (tp.Name == name)
- return tp;
- }
+ #region Properties
- return null;
+ public TypeParameter[] MethodTypeParameters {
+ get {
+ return mvar;
+ }
}
- public void SetConstraints (GenericTypeParameterBuilder type)
- {
- GenericParameterAttributes attr = GenericParameterAttributes.None;
- if (variance == Variance.Contravariant)
- attr |= GenericParameterAttributes.Contravariant;
- else if (variance == Variance.Covariant)
- attr |= GenericParameterAttributes.Covariant;
+ #endregion
- if (gc != null) {
- if (gc.HasClassConstraint || gc.HasValueTypeConstraint)
- type.SetBaseTypeConstraint (gc.EffectiveBaseClass);
+ public static TypeSpec GetMemberDeclaringType (TypeSpec type)
+ {
+ if (type is InflatedTypeSpec) {
+ if (type.DeclaringType == null)
+ return type.GetDefinition ();
- attr |= gc.Attributes;
- type.SetInterfaceConstraints (gc.InterfaceConstraints);
- TypeManager.RegisterBuilder (type, gc.InterfaceConstraints);
+ var parent = GetMemberDeclaringType (type.DeclaringType);
+ type = MemberCache.GetMember<TypeSpec> (parent, type);
}
-
- type.SetGenericParameterAttributes (attr);
+
+ return type;
}
- /// <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 (MemberCore ec, Constraints new_constraints)
+ public TypeSpec Mutate (TypeSpec ts)
{
- if (type == null)
- throw new InvalidOperationException ();
+ TypeSpec value;
+ if (mutated_typespec.TryGetValue (ts, out value))
+ return value;
- if (new_constraints == null)
- return true;
-
- if (!new_constraints.Resolve (ec, this, Report))
- return false;
- if (!new_constraints.ResolveTypes (ec, Report))
- return false;
+ value = ts.Mutate (this);
+ mutated_typespec.Add (ts, value);
+ return value;
+ }
- if (constraints != null)
- return constraints.AreEqual (new_constraints);
+ public TypeParameterSpec Mutate (TypeParameterSpec tp)
+ {
+ for (int i = 0; i < mvar.Length; ++i) {
+ if (mvar[i].Type == tp)
+ return var[i].Type;
+ }
- constraints = new_constraints;
- return true;
+ return tp;
}
- public override void Emit ()
+ public TypeSpec[] Mutate (TypeSpec[] targs)
{
- if (OptAttributes != null)
- OptAttributes.Emit ();
+ TypeSpec[] mutated = new TypeSpec[targs.Length];
+ bool changed = false;
+ for (int i = 0; i < targs.Length; ++i) {
+ mutated[i] = Mutate (targs[i]);
+ changed |= targs[i] != mutated[i];
+ }
- base.Emit ();
+ return changed ? mutated : targs;
}
+ }
- public override string DocCommentHeader {
- get {
- throw new InvalidOperationException (
- "Unexpected attempt to get doc comment from " + this.GetType () + ".");
- }
+ /// <summary>
+ /// A TypeExpr which already resolved to a type parameter.
+ /// </summary>
+ public class TypeParameterExpr : TypeExpr {
+
+ public TypeParameterExpr (TypeParameter type_parameter, Location loc)
+ {
+ this.type = type_parameter.Type;
+ this.eclass = ExprClass.TypeParameter;
+ this.loc = loc;
}
- //
- // MemberContainer
- //
+ protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
+ {
+ throw new NotSupportedException ();
+ }
- public override bool Define ()
+ public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
{
- return true;
+ return this;
}
- public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
+ public override bool CheckAccessLevel (IMemberContext ds)
{
- type.SetCustomAttribute (cb);
+ return true;
}
+ }
- public override AttributeTargets AttributeTargets {
- get {
- return AttributeTargets.GenericParameter;
- }
+ public class InflatedTypeSpec : TypeSpec
+ {
+ TypeSpec[] targs;
+ TypeParameterSpec[] constraints;
+ readonly TypeSpec open_type;
+
+ public InflatedTypeSpec (TypeSpec openType, TypeSpec declaringType, TypeSpec[] targs)
+ : base (openType.Kind, declaringType, openType.MemberDefinition, null, openType.Modifiers)
+ {
+ if (targs == null)
+ throw new ArgumentNullException ("targs");
+
+// this.state = openType.state;
+ this.open_type = openType;
+ this.targs = targs;
}
- public override string[] ValidAttributeTargets {
+ #region Properties
+
+ public override TypeSpec BaseType {
get {
- return attribute_target;
+ if (cache == null || (state & StateFlags.PendingBaseTypeInflate) != 0)
+ InitializeMemberCache (true);
+
+ return base.BaseType;
}
}
//
- // IMemberContainer
+ // Inflated type parameters with constraints array, mapping with type arguments is based on index
//
-
- string IMemberContainer.Name {
- get { return Name; }
- }
-
- MemberCache IMemberContainer.BaseCache {
+ public TypeParameterSpec[] Constraints {
get {
- if (gc == null)
- return null;
-
- if (gc.EffectiveBaseClass.BaseType == null)
- return null;
+ if (constraints == null) {
+ var inflator = new TypeParameterInflator (this, MemberDefinition.TypeParameters, targs);
+ constraints = TypeParameterSpec.InflateConstraints (inflator, MemberDefinition.TypeParameters);
+ }
- return TypeManager.LookupMemberCache (gc.EffectiveBaseClass.BaseType);
+ return constraints;
}
}
- bool IMemberContainer.IsInterface {
- get { return false; }
- }
+ public override IList<TypeSpec> Interfaces {
+ get {
+ if (cache == null)
+ InitializeMemberCache (true);
- MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
- {
- throw new NotSupportedException ();
+ return base.Interfaces;
+ }
}
- public MemberCache MemberCache {
+ //
+ // Types used to inflate the generic type
+ //
+ public override TypeSpec[] TypeArguments {
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;
+ return targs;
}
}
- public MemberList FindMembers (MemberTypes mt, BindingFlags bf,
- MemberFilter filter, object criteria)
- {
- if (gc == null)
- return MemberList.Empty;
-
- var members = new List<MemberInfo> ();
-
- if (gc.HasClassConstraint) {
- MemberList list = TypeManager.FindMembers (
- gc.ClassConstraint, mt, bf, filter, criteria);
+ #endregion
- members.AddRange (list);
- }
+ Type CreateMetaInfo (TypeParameterMutator mutator)
+ {
+ //
+ // Converts nested type arguments into right order
+ // Foo<string, bool>.Bar<int> => string, bool, int
+ //
+ var all = new List<Type> ();
+ TypeSpec type = this;
+ TypeSpec definition = type;
+ do {
+ if (type.GetDefinition().IsGeneric) {
+ all.InsertRange (0,
+ type.TypeArguments != TypeSpec.EmptyTypes ?
+ type.TypeArguments.Select (l => l.GetMetaInfo ()) :
+ type.MemberDefinition.TypeParameters.Select (l => l.GetMetaInfo ()));
+ }
- Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
- foreach (Type t in ifaces) {
- MemberList list = TypeManager.FindMembers (
- t, mt, bf, filter, criteria);
+ definition = definition.GetDefinition ();
+ type = type.DeclaringType;
+ } while (type != null);
- members.AddRange (list);
- }
+ return definition.GetMetaInfo ().MakeGenericType (all.ToArray ());
+ }
- return new MemberList (members);
+ public override ObsoleteAttribute GetAttributeObsolete ()
+ {
+ return open_type.GetAttributeObsolete ();
}
- public bool IsSubclassOf (Type t)
+ protected override bool IsNotCLSCompliant ()
{
- if (type.Equals (t))
+ if (base.IsNotCLSCompliant ())
return true;
- if (constraints != null)
- return constraints.IsSubclassOf (t);
+ foreach (var ta in TypeArguments) {
+ if (ta.MemberDefinition.IsNotCLSCompliant ())
+ return true;
+ }
return false;
}
- public void InflateConstraints (Type declaring)
+ public override TypeSpec GetDefinition ()
{
- if (constraints != null)
- gc = new InflatedConstraints (constraints, declaring);
+ return open_type;
}
-
- public override bool IsClsComplianceRequired ()
+
+ public override Type GetMetaInfo ()
{
- return false;
+ if (info == null)
+ info = CreateMetaInfo (null);
+
+ return info;
}
- protected class InflatedConstraints : GenericConstraints
+ public override string GetSignatureForError ()
{
- GenericConstraints gc;
- Type base_type;
- Type class_constraint;
- Type[] iface_constraints;
- Type[] dargs;
+ if (TypeManager.IsNullableType (open_type))
+ return targs[0].GetSignatureForError () + "?";
- public InflatedConstraints (GenericConstraints gc, Type declaring)
- : this (gc, TypeManager.GetTypeArguments (declaring))
- { }
+ return base.GetSignatureForError ();
+ }
- public InflatedConstraints (GenericConstraints gc, Type[] dargs)
- {
- this.gc = gc;
- this.dargs = dargs;
+ protected override string GetTypeNameSignature ()
+ {
+ if (targs.Length == 0 || MemberDefinition is AnonymousTypeClass)
+ return null;
- var list = new List<Type> ();
- if (gc.HasClassConstraint)
- list.Add (inflate (gc.ClassConstraint));
- foreach (Type iface in gc.InterfaceConstraints)
- list.Add (inflate (iface));
+ return "<" + TypeManager.CSharpName (targs) + ">";
+ }
- bool has_class_constr = false;
- if (list.Count > 0) {
- Type first = (Type) list [0];
- has_class_constr = !first.IsGenericParameter && !first.IsInterface;
- }
+ protected override void InitializeMemberCache (bool onlyTypes)
+ {
+ if (cache == null)
+ cache = new MemberCache (onlyTypes ? open_type.MemberCacheTypes : open_type.MemberCache);
- 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);
+ TypeParameterSpec[] tparams_full;
+ TypeSpec[] targs_full = targs;
+ if (IsNested) {
+ //
+ // Special case is needed when we are inflating an open type (nested type definition)
+ // on inflated parent. Consider following case
+ //
+ // Foo<T>.Bar<U> => Foo<string>.Bar<U>
+ //
+ // Any later inflation of Foo<string>.Bar<U> has to also inflate T if used inside Bar<U>
+ //
+ List<TypeSpec> merged_targs = null;
+ List<TypeParameterSpec> merged_tparams = null;
+
+ var type = DeclaringType;
+
+ do {
+ if (type.TypeArguments.Length > 0) {
+ if (merged_targs == null) {
+ merged_targs = new List<TypeSpec> ();
+ merged_tparams = new List<TypeParameterSpec> ();
+ if (targs.Length > 0) {
+ merged_targs.AddRange (targs);
+ merged_tparams.AddRange (open_type.MemberDefinition.TypeParameters);
+ }
+ }
+ merged_tparams.AddRange (type.MemberDefinition.TypeParameters);
+ merged_targs.AddRange (type.TypeArguments);
+ }
+ type = type.DeclaringType;
+ } while (type != null);
+
+ if (merged_targs != null) {
+ // Type arguments are not in the right order but it should not matter in this case
+ targs_full = merged_targs.ToArray ();
+ tparams_full = merged_tparams.ToArray ();
+ } else if (targs.Length == 0) {
+ tparams_full = TypeParameterSpec.EmptyTypes;
} else {
- iface_constraints = new Type [list.Count];
- list.CopyTo (iface_constraints, 0);
+ tparams_full = open_type.MemberDefinition.TypeParameters;
}
-
- if (HasValueTypeConstraint)
- base_type = TypeManager.value_type;
- else if (class_constraint != null)
- base_type = class_constraint;
- else
- base_type = TypeManager.object_type;
+ } else if (targs.Length == 0) {
+ tparams_full = TypeParameterSpec.EmptyTypes;
+ } else {
+ tparams_full = open_type.MemberDefinition.TypeParameters;
}
- 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];
+ var inflator = new TypeParameterInflator (this, tparams_full, targs_full);
+
+ //
+ // Two stage inflate due to possible nested types recursive
+ // references
+ //
+ // class A<T> {
+ // B b;
+ // class B {
+ // T Value;
+ // }
+ // }
+ //
+ // When resolving type of `b' members of `B' cannot be
+ // inflated because are not yet available in membercache
+ //
+ if ((state & StateFlags.PendingMemberCacheMembers) == 0) {
+ open_type.MemberCacheTypes.InflateTypes (cache, inflator);
- for (int i = 0; i < args.Length; i++)
- inflated [i] = inflate (args [i]);
+ //
+ // Inflate any implemented interfaces
+ //
+ if (open_type.Interfaces != null) {
+ ifaces = new List<TypeSpec> (open_type.Interfaces.Count);
+ foreach (var iface in open_type.Interfaces) {
+ var iface_inflated = inflator.Inflate (iface);
+ AddInterface (iface_inflated);
+ }
+ }
- t = t.GetGenericTypeDefinition ();
- t = t.MakeGenericType (inflated);
+ //
+ // Handles the tricky case of recursive nested base generic type
+ //
+ // class A<T> : Base<A<T>.Nested> {
+ // class Nested {}
+ // }
+ //
+ // When inflating A<T>. base type is not yet known, secondary
+ // inflation is required (not common case) once base scope
+ // is known
+ //
+ if (open_type.BaseType == null) {
+ if (IsClass)
+ state |= StateFlags.PendingBaseTypeInflate;
+ } else {
+ BaseType = inflator.Inflate (open_type.BaseType);
}
-
- return t;
- }
-
- public override string TypeParameter {
- get { return gc.TypeParameter; }
+ } else if ((state & StateFlags.PendingBaseTypeInflate) != 0) {
+ BaseType = inflator.Inflate (open_type.BaseType);
+ state &= ~StateFlags.PendingBaseTypeInflate;
}
- public override GenericParameterAttributes Attributes {
- get { return gc.Attributes; }
+ if (onlyTypes) {
+ state |= StateFlags.PendingMemberCacheMembers;
+ return;
}
- public override Type ClassConstraint {
- get { return class_constraint; }
- }
+ var tc = open_type.MemberDefinition as TypeContainer;
+ if (tc != null && !tc.HasMembersDefined)
+ throw new InternalErrorException ("Inflating MemberCache with undefined members");
- public override Type EffectiveBaseClass {
- get { return base_type; }
+ if ((state & StateFlags.PendingBaseTypeInflate) != 0) {
+ BaseType = inflator.Inflate (open_type.BaseType);
+ state &= ~StateFlags.PendingBaseTypeInflate;
}
- public override Type[] InterfaceConstraints {
- get { return iface_constraints; }
- }
+ state &= ~StateFlags.PendingMemberCacheMembers;
+ open_type.MemberCache.InflateMembers (cache, open_type, inflator);
}
- }
- /// <summary>
- /// A TypeExpr which already resolved to a type parameter.
- /// </summary>
- public class TypeParameterExpr : TypeExpr {
-
- public TypeParameterExpr (TypeParameter type_parameter, Location loc)
+ public override TypeSpec Mutate (TypeParameterMutator mutator)
{
- this.type = type_parameter.Type;
- this.eclass = ExprClass.TypeParameter;
- this.loc = loc;
- }
+ var targs = TypeArguments;
+ if (targs != null)
+ targs = mutator.Mutate (targs);
- protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
- {
- throw new NotSupportedException ();
- }
+ var decl = DeclaringType;
+ if (IsNested && DeclaringType.IsGenericOrParentIsGeneric)
+ decl = mutator.Mutate (decl);
- public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
- {
- return this;
- }
+ if (targs == TypeArguments && decl == DeclaringType)
+ return this;
- public override bool IsInterface {
- get { return false; }
- }
+ var mutated = (InflatedTypeSpec) MemberwiseClone ();
+ if (decl != DeclaringType) {
+ // Gets back MethodInfo in case of metaInfo was inflated
+ //mutated.info = MemberCache.GetMember<TypeSpec> (DeclaringType.GetDefinition (), this).info;
- public override bool CheckAccessLevel (IMemberContext ds)
- {
- return true;
+ mutated.declaringType = decl;
+ mutated.state |= StateFlags.PendingMetaInflate;
+ }
+
+ if (targs != null) {
+ mutated.targs = targs;
+ mutated.info = null;
+ }
+
+ return mutated;
}
}
+
//
// Tracks the type arguments when instantiating a generic type. It's used
// by both type arguments and type parameters
//
- public class TypeArguments {
+ public class TypeArguments
+ {
List<FullNamedExpression> args;
- Type[] atypes;
-
- public TypeArguments ()
- {
- args = new List<FullNamedExpression> ();
- }
+ TypeSpec[] atypes;
public TypeArguments (params FullNamedExpression[] types)
{
args.Add (type);
}
- public void Add (TypeArguments new_args)
- {
- args.AddRange (new_args.args);
- }
-
// TODO: Kill this monster
public TypeParameterName[] GetDeclarations ()
{
/// We may only be used after Resolve() is called and return the fully
/// resolved types.
/// </summary>
- public Type[] Arguments {
+ // TODO: Not needed, just return type from resolve
+ public TypeSpec[] Arguments {
get {
return atypes;
}
}
}
+ public virtual bool IsEmpty {
+ get {
+ return false;
+ }
+ }
+
public string GetSignatureForError()
{
- StringBuilder sb = new StringBuilder();
- for (int i = 0; i < Count; ++i)
- {
- Expression expr = (Expression)args [i];
- sb.Append(expr.GetSignatureForError());
+ StringBuilder sb = new StringBuilder ();
+ for (int i = 0; i < Count; ++i) {
+ var expr = args[i];
+ if (expr != null)
+ sb.Append (expr.GetSignatureForError ());
+
if (i + 1 < Count)
- sb.Append(',');
+ sb.Append (',');
}
- return sb.ToString();
+
+ return sb.ToString ();
}
/// <summary>
/// Resolve the type arguments.
/// </summary>
- public bool Resolve (IMemberContext ec)
+ public virtual bool Resolve (IMemberContext ec)
{
if (atypes != null)
- return atypes.Length != 0;
+ return atypes.Length != 0;
int count = args.Count;
bool ok = true;
- atypes = new Type [count];
+ atypes = new TypeSpec [count];
for (int i = 0; i < count; i++){
- TypeExpr te = ((FullNamedExpression) args[i]).ResolveAsTypeTerminal (ec, false);
+ TypeExpr te = args[i].ResolveAsTypeTerminal (ec, false);
if (te == null) {
ok = false;
continue;
atypes[i] = te.Type;
- if (te.Type.IsSealed && te.Type.IsAbstract) {
+ if (te.Type.IsStatic) {
ec.Compiler.Report.Error (718, te.Location, "`{0}': static classes cannot be used as generic arguments",
te.GetSignatureForError ());
ok = false;
}
if (!ok)
- atypes = Type.EmptyTypes;
+ atypes = TypeSpec.EmptyTypes;
return ok;
}
}
}
+ public class UnboundTypeArguments : TypeArguments
+ {
+ public UnboundTypeArguments (int arity)
+ : base (new FullNamedExpression[arity])
+ {
+ }
+
+ public override bool IsEmpty {
+ get {
+ return true;
+ }
+ }
+
+ public override bool Resolve (IMemberContext ec)
+ {
+ // Nothing to be resolved
+ return true;
+ }
+ }
+
public class TypeParameterName : SimpleName
{
Attributes attributes;
}
}
- /// <summary>
- /// A reference expression to generic type
- /// </summary>
+ //
+ // A type expression of generic type with type arguments
+ //
class GenericTypeExpr : TypeExpr
{
TypeArguments args;
- Type[] gen_params; // TODO: Waiting for constrains check cleanup
- Type open_type;
-
- //
- // Should be carefully used only with defined generic containers. Type parameters
- // can be used as type arguments in this case.
- //
- // TODO: This could be GenericTypeExpr specialization
- //
- public GenericTypeExpr (DeclSpace gType, Location l)
- {
- open_type = gType.TypeBuilder.GetGenericTypeDefinition ();
-
- args = new TypeArguments ();
- foreach (TypeParameter type_param in gType.TypeParameters)
- args.Add (new TypeParameterExpr (type_param, l));
-
- this.loc = l;
- }
+ TypeSpec open_type;
+ bool constraints_checked;
/// <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 GenericTypeExpr (Type t, TypeArguments args, Location l)
+ public GenericTypeExpr (TypeSpec open_type, TypeArguments args, Location l)
{
- open_type = t.GetGenericTypeDefinition ();
-
+ this.open_type = open_type;
loc = l;
this.args = args;
}
protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
{
- eclass = ExprClass.Type;
-
if (!args.Resolve (ec))
return null;
- gen_params = open_type.GetGenericArguments ();
- Type[] atypes = args.Arguments;
-
- if (atypes.Length != gen_params.Length) {
- Namespace.Error_InvalidNumberOfTypeArguments (ec.Compiler.Report, open_type, loc);
- return null;
- }
+ TypeSpec[] atypes = args.Arguments;
//
// Now bind the parameters
//
type = open_type.MakeGenericType (atypes);
+
+ //
+ // Check constraints when context is not method/base type
+ //
+ if (!ec.HasUnresolvedConstraints)
+ CheckConstraints (ec);
+
return this;
}
- /// <summary>
- /// Check the constraints; we're called from ResolveAsTypeTerminal()
- /// after fully resolving the constructed type.
- /// </summary>
+ //
+ // Checks the constraints of open generic type against type
+ // arguments. Has to be called after all members have been defined
+ //
public bool CheckConstraints (IMemberContext ec)
{
- return ConstraintChecker.CheckConstraints (ec, open_type, gen_params, args.Arguments, loc);
+ if (constraints_checked)
+ return true;
+
+ constraints_checked = true;
+
+ var gtype = (InflatedTypeSpec) type;
+ var constraints = gtype.Constraints;
+ if (constraints == null)
+ return true;
+
+ return new ConstraintChecker(ec).CheckAll (open_type, args.Arguments, constraints, loc);
}
public override bool CheckAccessLevel (IMemberContext mc)
{
- return mc.CurrentTypeDefinition.CheckAccessLevel (open_type);
+ DeclSpace c = mc.CurrentMemberDefinition as DeclSpace;
+ if (c == null)
+ c = mc.CurrentMemberDefinition.Parent;
+
+ return c.CheckAccessLevel (open_type);
}
public bool HasDynamicArguments ()
return HasDynamicArguments (args.Arguments);
}
- static bool HasDynamicArguments (Type[] args)
+ static bool HasDynamicArguments (TypeSpec[] args)
{
- foreach (var item in args)
- {
- if (TypeManager.IsGenericType (item))
- return HasDynamicArguments (TypeManager.GetTypeArguments (item));
+ for (int i = 0; i < args.Length; ++i) {
+ var item = args[i];
- if (TypeManager.IsDynamicType (item))
+ if (item == InternalType.Dynamic)
return true;
- }
-
- return false;
- }
- public override bool IsClass {
- get { return open_type.IsClass; }
- }
+ if (TypeManager.IsGenericType (item))
+ return HasDynamicArguments (TypeManager.GetTypeArguments (item));
- public override bool IsValueType {
- get { return TypeManager.IsStruct (open_type); }
- }
+ if (item.IsArray) {
+ while (item.IsArray) {
+ item = ((ArrayContainer) item).Element;
+ }
- public override bool IsInterface {
- get { return open_type.IsInterface; }
- }
+ if (item == InternalType.Dynamic)
+ return true;
+ }
+ }
- public override bool IsSealed {
- get { return open_type.IsSealed; }
+ return false;
}
public override bool Equals (object obj)
}
}
- public abstract class ConstraintChecker
+ //
+ // Generic type with unbound type arguments, used for typeof (G<,,>)
+ //
+ class GenericOpenTypeExpr : TypeExpr
{
- protected readonly Type[] gen_params;
- protected readonly Type[] atypes;
- protected readonly Location loc;
- protected Report Report;
-
- protected ConstraintChecker (Type[] gen_params, Type[] atypes, Location loc, Report r)
+ public GenericOpenTypeExpr (TypeSpec type, /*UnboundTypeArguments args,*/ Location loc)
{
- this.gen_params = gen_params;
- this.atypes = atypes;
+ this.type = type.GetDefinition ();
this.loc = loc;
- this.Report = r;
}
- /// <summary>
- /// Check the constraints; we're called from ResolveAsTypeTerminal()
- /// after fully resolving the constructed type.
- /// </summary>
- public bool CheckConstraints (IMemberContext ec)
+ protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
{
- for (int i = 0; i < gen_params.Length; i++) {
- if (!CheckConstraints (ec, i))
- return false;
- }
-
- return true;
+ return this;
}
+ }
- protected bool CheckConstraints (IMemberContext ec, int index)
+ struct ConstraintChecker
+ {
+ IMemberContext mc;
+ bool ignore_inferred_dynamic;
+
+ public ConstraintChecker (IMemberContext ctx)
{
- Type atype = TypeManager.TypeToCoreType (atypes [index]);
- Type ptype = gen_params [index];
+ this.mc = ctx;
+ ignore_inferred_dynamic = false;
+ }
- if (atype == ptype)
- return true;
+ #region Properties
- Expression aexpr = new EmptyExpression (atype);
+ public bool IgnoreInferredDynamic {
+ get {
+ return ignore_inferred_dynamic;
+ }
+ set {
+ ignore_inferred_dynamic = value;
+ }
+ }
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (ptype);
- if (gc == null)
- return true;
+ #endregion
- bool is_class, is_struct;
- if (atype.IsGenericParameter) {
- GenericConstraints agc = TypeManager.GetTypeParameterConstraints (atype);
- if (agc != null) {
- if (agc is Constraints) {
- // FIXME: No constraints can be resolved here, we are in
- // completely wrong/different context. This path is hit
- // when resolving base type of unresolved generic type
- // with constraints. We are waiting with CheckConsttraints
- // after type-definition but not in this case
- if (!((Constraints) agc).Resolve (null, null, Report))
- return true;
- }
- is_class = agc.IsReferenceType;
- is_struct = agc.IsValueType;
- } else {
- is_class = is_struct = false;
- }
- } else {
- is_class = TypeManager.IsReferenceType (atype);
- is_struct = TypeManager.IsValueType (atype) && !TypeManager.IsNullableType (atype);
+ //
+ // Checks all type arguments againts type parameters constraints
+ // NOTE: It can run in probing mode when `mc' is null
+ //
+ public bool CheckAll (MemberSpec context, TypeSpec[] targs, TypeParameterSpec[] tparams, Location loc)
+ {
+ for (int i = 0; i < tparams.Length; i++) {
+ if (ignore_inferred_dynamic && targs[i] == InternalType.Dynamic)
+ continue;
+
+ if (!CheckConstraint (context, targs [i], tparams [i], loc))
+ return false;
}
+ return true;
+ }
+
+ bool CheckConstraint (MemberSpec context, TypeSpec atype, TypeParameterSpec tparam, Location loc)
+ {
//
// 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 ());
+ if (tparam.HasSpecialClass && !TypeManager.IsReferenceType (atype)) {
+ if (mc != null) {
+ mc.Compiler.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), tparam.GetSignatureForError (), context.GetSignatureForError ());
+ }
+
return false;
}
- //
- // The class constraint comes next.
- //
- if (gc.HasClassConstraint) {
- if (!CheckConstraint (ec, ptype, aexpr, gc.ClassConstraint))
- return false;
+ if (tparam.HasSpecialStruct && (!TypeManager.IsValueType (atype) || TypeManager.IsNullableType (atype))) {
+ if (mc != null) {
+ mc.Compiler.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), tparam.GetSignatureForError (), context.GetSignatureForError ());
+ }
+
+ return false;
}
+ bool ok = true;
+
//
- // Now, check the interface constraints.
+ // Check the class constraint
//
- if (gc.InterfaceConstraints != null) {
- foreach (Type it in gc.InterfaceConstraints) {
- if (!CheckConstraint (ec, ptype, aexpr, it))
+ if (tparam.HasTypeConstraint) {
+ if (!CheckConversion (mc, context, atype, tparam, tparam.BaseType, loc)) {
+ if (mc == null)
return false;
+
+ ok = false;
}
}
//
- // Finally, check the constructor constraint.
+ // Check the interfaces constraints
//
+ if (tparam.Interfaces != null) {
+ if (TypeManager.IsNullableType (atype)) {
+ if (mc == null)
+ return false;
- if (!gc.HasConstructorConstraint)
- return true;
-
- if (TypeManager.IsValueType (atype))
- 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;
- }
-
- Type InflateType(IMemberContext ec, Type ctype)
- {
- Type[] types = TypeManager.GetTypeArguments (ctype);
-
- TypeArguments new_args = new TypeArguments ();
-
- for (int i = 0; i < types.Length; i++) {
- Type t = TypeManager.TypeToCoreType (types [i]);
+ mc.Compiler.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",
+ atype.GetSignatureForError (), tparam.GetSignatureForError (), context.GetSignatureForError ());
+ ok = false;
+ } else {
+ foreach (TypeSpec iface in tparam.Interfaces) {
+ if (!CheckConversion (mc, context, atype, tparam, iface, loc)) {
+ if (mc == null)
+ return false;
- if (t.IsGenericParameter) {
- int pos = t.GenericParameterPosition;
- if (t.DeclaringMethod == null && this is MethodConstraintChecker) {
- Type parent = ((MethodConstraintChecker) this).declaring_type;
- t = parent.GetGenericArguments ()[pos];
- } else {
- t = atypes [pos];
- }
- } else if(TypeManager.HasGenericArguments(t)) {
- t = InflateType (ec, t);
- if (t == null) {
- return null;
+ ok = false;
+ }
}
}
- new_args.Add (new TypeExpression (t, loc));
}
- TypeExpr ct = new GenericTypeExpr (ctype, new_args, loc);
- if (ct.ResolveAsTypeStep (ec, false) == null)
- return null;
-
- return ct.Type;
- }
-
- protected bool CheckConstraint (IMemberContext ec, Type ptype, Expression expr,
- Type ctype)
- {
//
- // All this is needed because we don't have
- // real inflated type hierarchy
+ // Check the type parameter constraint
//
- if (TypeManager.HasGenericArguments (ctype)) {
- ctype = InflateType (ec, ctype);
- if(ctype == null) {
- return false;
- }
- } else if (ctype.IsGenericParameter) {
- int pos = ctype.GenericParameterPosition;
- if (ctype.DeclaringMethod == null) {
- // FIXME: Implement
- return true;
- } else {
- ctype = atypes [pos];
+ if (tparam.TypeArguments != null) {
+ foreach (var ta in tparam.TypeArguments) {
+ if (!CheckConversion (mc, context, atype, tparam, ta, loc)) {
+ if (mc == null)
+ return false;
+
+ ok = false;
+ }
}
}
- if (Convert.ImplicitStandardConversionExists (expr, ctype))
- return true;
-
- Report_SymbolRelatedToPreviousError ();
- Report.SymbolRelatedToPreviousError (expr.Type);
+ //
+ // Finally, check the constructor constraint.
+ //
+ if (!tparam.HasSpecialConstructor)
+ return ok;
- 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 ());
+ if (!HasDefaultConstructor (atype)) {
+ if (mc != null) {
+ mc.Compiler.Report.SymbolRelatedToPreviousError (atype);
+ mc.Compiler.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), tparam.GetSignatureForError (), context.GetSignatureForError ());
+ }
+ return false;
}
- return false;
+
+ return ok;
}
- static bool HasDefaultConstructor (Type atype)
+ static bool HasDynamicTypeArgument (TypeSpec[] targs)
{
- TypeParameter tparam = TypeManager.LookupTypeParameter (atype);
- if (tparam != null) {
- if (tparam.GenericConstraints == null)
- return false;
-
- return tparam.GenericConstraints.HasConstructorConstraint ||
- tparam.GenericConstraints.HasValueTypeConstraint;
- }
-
- 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;
-
+ for (int i = 0; i < targs.Length; ++i) {
+ var targ = targs [i];
+ if (targ == InternalType.Dynamic)
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)
+ if (HasDynamicTypeArgument (targ.TypeArguments))
return true;
}
return false;
}
- protected abstract string GetSignatureForError ();
- protected abstract void Report_SymbolRelatedToPreviousError ();
-
- public static bool CheckConstraints (IMemberContext ec, MethodBase definition,
- MethodBase instantiated, Location loc)
+ bool CheckConversion (IMemberContext mc, MemberSpec context, TypeSpec atype, TypeParameterSpec tparam, TypeSpec ttype, Location loc)
{
- MethodConstraintChecker checker = new MethodConstraintChecker (
- definition, instantiated.DeclaringType, definition.GetGenericArguments (),
- instantiated.GetGenericArguments (), loc, ec.Compiler.Report);
+ var expr = new EmptyExpression (atype);
+ if (Convert.ImplicitStandardConversionExists (expr, ttype))
+ return true;
- return checker.CheckConstraints (ec);
- }
+ //
+ // When partial/full type inference finds a dynamic type argument delay
+ // the constraint check to runtime, it can succeed for real underlying
+ // dynamic type
+ //
+ if (ignore_inferred_dynamic && HasDynamicTypeArgument (ttype.TypeArguments))
+ return true;
- public static bool CheckConstraints (IMemberContext ec, Type gt, Type[] gen_params,
- Type[] atypes, Location loc)
- {
- TypeConstraintChecker checker = new TypeConstraintChecker (
- gt, gen_params, atypes, loc, ec.Compiler.Report);
+ if (mc != null) {
+ mc.Compiler.Report.SymbolRelatedToPreviousError (tparam);
+ if (TypeManager.IsValueType (atype)) {
+ mc.Compiler.Report.Error (315, loc,
+ "The type `{0}' cannot be used as type parameter `{1}' in the generic type or method `{2}'. There is no boxing conversion from `{0}' to `{3}'",
+ atype.GetSignatureForError (), tparam.GetSignatureForError (), context.GetSignatureForError (), ttype.GetSignatureForError ());
+ } else if (atype.IsGenericParameter) {
+ mc.Compiler.Report.Error (314, loc,
+ "The type `{0}' cannot be used as type parameter `{1}' in the generic type or method `{2}'. There is no boxing or type parameter conversion from `{0}' to `{3}'",
+ atype.GetSignatureForError (), tparam.GetSignatureForError (), context.GetSignatureForError (), ttype.GetSignatureForError ());
+ } else {
+ mc.Compiler.Report.Error (311, loc,
+ "The type `{0}' cannot be used as type parameter `{1}' in the generic type or method `{2}'. There is no implicit reference conversion from `{0}' to `{3}'",
+ atype.GetSignatureForError (), tparam.GetSignatureForError (), context.GetSignatureForError (), ttype.GetSignatureForError ());
+ }
+ }
- return checker.CheckConstraints (ec);
+ return false;
}
- protected class MethodConstraintChecker : ConstraintChecker
+ bool HasDefaultConstructor (TypeSpec atype)
{
- MethodBase definition;
- public Type declaring_type;
-
- public MethodConstraintChecker (MethodBase definition, Type declaringType, Type[] gen_params,
- Type[] atypes, Location loc, Report r)
- : base (gen_params, atypes, loc, r)
- {
- this.declaring_type = declaringType;
- this.definition = definition;
+ var tp = atype as TypeParameterSpec;
+ if (tp != null) {
+ return tp.HasSpecialConstructor || tp.HasSpecialStruct;
}
- protected override string GetSignatureForError ()
- {
- return TypeManager.CSharpSignature (definition);
- }
+ if (atype.IsStruct || atype.IsEnum)
+ return true;
- protected override void Report_SymbolRelatedToPreviousError ()
- {
- Report.SymbolRelatedToPreviousError (definition);
- }
- }
+ if (atype.IsAbstract)
+ return false;
- protected class TypeConstraintChecker : ConstraintChecker
- {
- Type gt;
+ var tdef = atype.GetDefinition ();
+
+ //
+ // In some circumstances MemberCache is not yet populated and members
+ // cannot be defined yet (recursive type new constraints)
+ //
+ // class A<T> where T : B<T>, new () {}
+ // class B<T> where T : A<T>, new () {}
+ //
+ var tc = tdef.MemberDefinition as Class;
+ if (tc != null) {
+ if (tc.InstanceConstructors == null) {
+ // Default ctor will be generated later
+ return true;
+ }
+
+ foreach (var c in tc.InstanceConstructors) {
+ if (c.ParameterInfo.IsEmpty) {
+ if ((c.ModFlags & Modifiers.PUBLIC) != 0)
+ return true;
+ }
+ }
- public TypeConstraintChecker (Type gt, Type[] gen_params, Type[] atypes,
- Location loc, Report r)
- : base (gen_params, atypes, loc, r)
- {
- this.gt = gt;
+ return false;
}
- protected override string GetSignatureForError ()
- {
- return TypeManager.CSharpName (gt);
- }
+ var found = MemberCache.FindMember (tdef,
+ MemberFilter.Constructor (ParametersCompiled.EmptyReadOnlyParameters),
+ BindingRestriction.DeclaredOnly | BindingRestriction.InstanceOnly);
- protected override void Report_SymbolRelatedToPreviousError ()
- {
- Report.SymbolRelatedToPreviousError (gt);
- }
+ return found != null && (found.Modifiers & Modifiers.PUBLIC) != 0;
}
}
/// </summary>
public class GenericMethod : DeclSpace
{
- FullNamedExpression return_type;
ParametersCompiled parameters;
public GenericMethod (NamespaceEntry ns, DeclSpace parent, MemberName name,
FullNamedExpression return_type, ParametersCompiled parameters)
: base (ns, parent, name, null)
{
- this.return_type = return_type;
this.parameters = parameters;
}
- public override TypeContainer CurrentTypeDefinition {
- get {
- return Parent.CurrentTypeDefinition;
- }
+ public GenericMethod (NamespaceEntry ns, DeclSpace parent, MemberName name, TypeParameter[] tparams,
+ FullNamedExpression return_type, ParametersCompiled parameters)
+ : this (ns, parent, name, return_type, parameters)
+ {
+ this.type_params = tparams;
}
public override TypeParameter[] CurrentTypeParameters {
throw new Exception ();
}
- public override bool Define ()
+ public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
{
- for (int i = 0; i < TypeParameters.Length; i++)
- if (!TypeParameters [i].Resolve (this))
- return false;
+ throw new NotSupportedException ();
+ }
- return true;
+ public override bool Define ()
+ {
+ throw new NotSupportedException ();
}
/// <summary>
{
TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
string[] snames = new string [names.Length];
+ var block = m.Block;
for (int i = 0; i < names.Length; i++) {
string type_argument_name = names[i].Name;
- int idx = parameters.GetParameterIndexByName (type_argument_name);
- if (idx >= 0) {
- Block b = m.Block;
- if (b == null)
- b = new Block (null);
- b.Error_AlreadyDeclaredTypeParameter (Report, parameters [i].Location,
- type_argument_name, "method parameter");
+ if (block == null) {
+ int idx = parameters.GetParameterIndexByName (type_argument_name);
+ if (idx >= 0) {
+ var b = m.Block;
+ if (b == null)
+ b = new ToplevelBlock (Compiler, Location);
+
+ b.Error_AlreadyDeclaredTypeParameter (type_argument_name, parameters[i].Location);
+ }
+ } else {
+ INamedBlockVariable variable = null;
+ block.GetLocalName (type_argument_name, m.Block, ref variable);
+ if (variable != null)
+ variable.Block.Error_AlreadyDeclaredTypeParameter (type_argument_name, variable.Location);
}
-
+
snames[i] = type_argument_name;
}
GenericTypeParameterBuilder[] gen_params = m.MethodBuilder.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;
- }
+ TypeParameters [i].Define (gen_params [i], null);
return true;
}
- /// <summary>
- /// We're called from MethodData.Define() after creating the MethodBuilder.
- /// </summary>
- public bool DefineType (IMemberContext 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 string GetSignatureForError ()
{
return base.GetSignatureForError () + parameters.GetSignatureForError ();
}
- public override MemberCache MemberCache {
- get {
- return null;
- }
- }
-
public override AttributeTargets AttributeTargets {
get {
return AttributeTargets.Method | AttributeTargets.ReturnValue;
public new void VerifyClsCompliance ()
{
foreach (TypeParameter tp in TypeParameters) {
- if (tp.Constraints == null)
- continue;
-
- tp.Constraints.VerifyClsCompliance (Report);
+ tp.VerifyClsCompliance ();
}
}
}
- partial class TypeManager
+ public partial class TypeManager
{
- public static TypeContainer LookupGenericTypeContainer (Type t)
- {
- t = DropGenericTypeArguments (t);
- return LookupTypeContainer (t);
- }
-
- public static Variance GetTypeParameterVariance (Type type)
+ public static Variance CheckTypeVariance (TypeSpec t, Variance expected, IMemberContext member)
{
- TypeParameter tparam = LookupTypeParameter (type);
- if (tparam != null)
- return tparam.Variance;
-
- switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
- case GenericParameterAttributes.Covariant:
- return Variance.Covariant;
- case GenericParameterAttributes.Contravariant:
- return Variance.Contravariant;
- default:
- return Variance.None;
- }
- }
-
- public static Variance CheckTypeVariance (Type t, Variance expected, IMemberContext member)
- {
- TypeParameter tp = LookupTypeParameter (t);
+ var tp = t as TypeParameterSpec;
if (tp != null) {
Variance v = tp.Variance;
if (expected == Variance.None && v != expected ||
expected == Variance.Covariant && v == Variance.Contravariant ||
- expected == Variance.Contravariant && v == Variance.Covariant)
- tp.ErrorInvalidVariance (member, expected);
+ expected == Variance.Contravariant && v == Variance.Covariant) {
+ ((TypeParameter)tp.MemberDefinition).ErrorInvalidVariance (member, expected);
+ }
return expected;
}
- if (t.IsGenericType) {
- Type[] targs_definition = GetTypeArguments (DropGenericTypeArguments (t));
- Type[] targs = GetTypeArguments (t);
- for (int i = 0; i < targs_definition.Length; ++i) {
- Variance v = GetTypeParameterVariance (targs_definition[i]);
+ if (t.TypeArguments.Length > 0) {
+ var targs_definition = t.MemberDefinition.TypeParameters;
+ TypeSpec[] targs = GetTypeArguments (t);
+ for (int i = 0; i < targs.Length; ++i) {
+ Variance v = targs_definition[i].Variance;
CheckTypeVariance (targs[i], (Variance) ((int)v * (int)expected), member);
}
return Variance.None;
}
-
- public static bool IsVariantOf (Type type1, Type type2)
- {
- if (!type1.IsGenericType || !type2.IsGenericType)
- return false;
-
- Type generic_target_type = DropGenericTypeArguments (type2);
- if (DropGenericTypeArguments (type1) != generic_target_type)
- return false;
-
- Type[] t1 = GetTypeArguments (type1);
- Type[] t2 = GetTypeArguments (type2);
- Type[] targs_definition = GetTypeArguments (generic_target_type);
- for (int i = 0; i < targs_definition.Length; ++i) {
- Variance v = GetTypeParameterVariance (targs_definition [i]);
- if (v == Variance.None) {
- if (t1[i] == t2[i])
- continue;
- return false;
- }
-
- if (v == Variance.Covariant) {
- if (!Convert.ImplicitReferenceConversionExists (new EmptyExpression (t1 [i]), t2 [i]))
- return false;
- } else if (!Convert.ImplicitReferenceConversionExists (new EmptyExpression (t2[i]), t1[i])) {
- return false;
- }
- }
-
- return true;
- }
-
- /// <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 = GetElementType (b);
- 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 = GetElementType (a);
- b = GetElementType (b);
-
- 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 (ResolveContext ec, Arguments arguments, ref MethodSpec 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 = method.Inflate (i_args);
- return 0;
- }
-
-/*
- public static bool InferTypeArguments (ResolveContext ec, AParametersCollection param, ref MethodBase method)
- {
- if (!TypeManager.IsGenericMethod (method))
- return true;
-
- ATypeInference ti = ATypeInference.CreateInstance (DelegateCreation.CreateDelegateMethodArguments (param, Location.Null));
- Type[] i_args = ti.InferDelegateArguments (ec, method);
- if (i_args == null)
- return false;
-
- method = ((MethodInfo) method).MakeGenericMethod (i_args);
- return true;
- }
-*/
- }
-
- abstract class ATypeInference
- {
- protected readonly Arguments arguments;
- protected readonly int arg_count;
-
- protected ATypeInference (Arguments arguments)
- {
- this.arguments = arguments;
- if (arguments != null)
- arg_count = arguments.Count;
- }
-
- public static ATypeInference CreateInstance (Arguments arguments)
- {
- return new TypeInference (arguments);
- }
-
- public virtual int InferenceScore {
- get {
- return int.MaxValue;
- }
- }
-
- public abstract Type[] InferMethodArguments (ResolveContext ec, MethodSpec method);
-// public abstract Type[] InferDelegateArguments (ResolveContext ec, MethodBase method);
}
//
// Implements C# type inference
//
- class TypeInference : ATypeInference
+ class TypeInference
{
//
// Tracks successful rate of type inference
//
int score = int.MaxValue;
+ readonly Arguments arguments;
+ readonly int arg_count;
public TypeInference (Arguments arguments)
- : base (arguments)
{
+ this.arguments = arguments;
+ if (arguments != null)
+ arg_count = arguments.Count;
}
- public override int InferenceScore {
+ public int InferenceScore {
get {
return score;
}
}
-/*
- public override Type[] InferDelegateArguments (ResolveContext ec, 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 (arguments [i].Expr.Type, t);
- }
-
- if (!context.FixAllTypes (ec))
- return null;
-
- return context.InferredTypeArguments;
- }
-*/
- public override Type[] InferMethodArguments (ResolveContext ec, MethodSpec method)
+ public TypeSpec[] InferMethodArguments (ResolveContext ec, MethodSpec method)
{
- var method_generic_args = method.GetGenericArguments ();
+ var method_generic_args = method.GenericDefinition.TypeParameters;
TypeInferenceContext context = new TypeInferenceContext (method_generic_args);
if (!context.UnfixedVariableExists)
- return Type.EmptyTypes;
+ return TypeSpec.EmptyTypes;
AParametersCollection pd = method.Parameters;
if (!InferInPhases (ec, context, pd))
params_arguments_start = arg_count;
}
- Type [] ptypes = methodParameters.Types;
+ TypeSpec [] ptypes = methodParameters.Types;
//
// The first inference phase
//
- Type method_parameter = null;
+ TypeSpec method_parameter = null;
for (int i = 0; i < arg_count; i++) {
Argument a = arguments [i];
if (a == null)
else
method_parameter = TypeManager.GetElementType (methodParameters.Types [params_arguments_start]);
- ptypes = (Type[]) ptypes.Clone ();
+ ptypes = (TypeSpec[]) ptypes.Clone ();
ptypes [i] = method_parameter;
}
continue;
}
- if (a.Expr.Type == TypeManager.null_type)
+ if (a.Expr.Type == InternalType.Null)
continue;
if (TypeManager.IsValueType (method_parameter)) {
return DoSecondPhase (ec, tic, ptypes, !fixed_any);
}
- bool DoSecondPhase (ResolveContext ec, TypeInferenceContext tic, Type[] methodParameters, bool fixDependent)
+ bool DoSecondPhase (ResolveContext ec, TypeInferenceContext tic, TypeSpec[] methodParameters, bool fixDependent)
{
bool fixed_any = false;
if (fixDependent && !tic.FixDependentTypes (ec, ref fixed_any))
for (int i = 0; i < arg_count; i++) {
// Align params arguments
- Type t_i = methodParameters [i >= methodParameters.Length ? methodParameters.Length - 1: i];
+ TypeSpec t_i = methodParameters [i >= methodParameters.Length ? methodParameters.Length - 1: i];
if (!TypeManager.IsDelegateType (t_i)) {
- if (TypeManager.DropGenericTypeArguments (t_i) != TypeManager.expression_type)
+ if (t_i.GetDefinition () != TypeManager.expression_type)
continue;
- t_i = t_i.GetGenericArguments () [0];
+ t_i = TypeManager.GetTypeArguments (t_i) [0];
}
- var mi = Delegate.GetInvokeMethod (ec.Compiler, 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
+ var mi = Delegate.GetInvokeMethod (ec.Compiler, t_i);
+ TypeSpec rtype = mi.ReturnType;
if (tic.IsReturnTypeNonDependent (ec, mi, rtype))
score -= tic.OutputTypeInference (ec, arguments [i].Expr, t_i);
Upper = 2
}
- class BoundInfo
+ class BoundInfo : IEquatable<BoundInfo>
{
- public readonly Type Type;
+ public readonly TypeSpec Type;
public readonly BoundKind Kind;
- public BoundInfo (Type type, BoundKind kind)
+ public BoundInfo (TypeSpec type, BoundKind kind)
{
this.Type = type;
this.Kind = kind;
return Type.GetHashCode ();
}
- public override bool Equals (object obj)
+ #region IEquatable<BoundInfo> Members
+
+ public bool Equals (BoundInfo other)
{
- BoundInfo a = (BoundInfo) obj;
- return Type == a.Type && Kind == a.Kind;
+ return Type == other.Type && Kind == other.Kind;
}
+
+ #endregion
}
- readonly Type[] unfixed_types;
- readonly Type[] fixed_types;
+ readonly TypeSpec[] unfixed_types;
+ readonly TypeSpec[] fixed_types;
readonly List<BoundInfo>[] bounds;
bool failed;
-
- public TypeInferenceContext (Type[] typeArguments)
+
+ // TODO MemberCache: Could it be TypeParameterSpec[] ??
+ public TypeInferenceContext (TypeSpec[] typeArguments)
{
if (typeArguments.Length == 0)
throw new ArgumentException ("Empty generic arguments");
- fixed_types = new Type [typeArguments.Length];
+ fixed_types = new TypeSpec [typeArguments.Length];
for (int i = 0; i < typeArguments.Length; ++i) {
if (typeArguments [i].IsGenericParameter) {
if (bounds == null) {
bounds = new List<BoundInfo> [typeArguments.Length];
- unfixed_types = new Type [typeArguments.Length];
+ unfixed_types = new TypeSpec [typeArguments.Length];
}
unfixed_types [i] = typeArguments [i];
} else {
//
public TypeInferenceContext ()
{
- fixed_types = new Type [1];
- unfixed_types = new Type [1];
+ fixed_types = new TypeSpec [1];
+ unfixed_types = new TypeSpec [1];
unfixed_types[0] = InternalType.Arglist; // it can be any internal type
bounds = new List<BoundInfo> [1];
}
- public Type[] InferredTypeArguments {
+ public TypeSpec[] InferredTypeArguments {
get {
return fixed_types;
}
}
- public void AddCommonTypeBound (Type type)
+ public void AddCommonTypeBound (TypeSpec type)
{
AddToBounds (new BoundInfo (type, BoundKind.Lower), 0);
}
var a = bounds [index];
if (a == null) {
- a = new List<BoundInfo> ();
+ a = new List<BoundInfo> (2);
+ a.Add (bound);
bounds [index] = a;
- } else {
- if (a.Contains (bound))
- return;
+ 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;
- // }
- //}
+ if (a.Contains (bound))
+ return;
+
a.Add (bound);
}
- bool AllTypesAreFixed (Type[] types)
+ bool AllTypesAreFixed (TypeSpec[] types)
{
- foreach (Type t in types) {
+ foreach (TypeSpec t in types) {
if (t.IsGenericParameter) {
if (!IsFixed (t))
return false;
continue;
}
- if (t.IsGenericType)
- return AllTypesAreFixed (t.GetGenericArguments ());
+ if (TypeManager.IsGenericType (t))
+ return AllTypesAreFixed (TypeManager.GetTypeArguments (t));
}
return true;
//
// 26.3.3.8 Exact Inference
//
- public int ExactInference (Type u, Type v)
+ public int ExactInference (TypeSpec u, TypeSpec v)
{
// If V is an array type
if (v.IsArray) {
if (!u.IsArray)
return 0;
- if (u.GetArrayRank () != v.GetArrayRank ())
+ // TODO MemberCache: GetMetaInfo ()
+ if (u.GetMetaInfo ().GetArrayRank () != v.GetMetaInfo ().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)
+ if (TypeManager.IsGenericType (v)) {
+ if (!TypeManager.IsGenericType (u))
return 0;
- Type [] ga_u = u.GetGenericArguments ();
- Type [] ga_v = v.GetGenericArguments ();
+ TypeSpec [] ga_u = TypeManager.GetTypeArguments (u);
+ TypeSpec [] ga_v = TypeManager.GetTypeArguments (v);
if (ga_u.Length != ga_v.Length)
return 0;
//
// All unfixed type variables Xi which depend on no Xj are fixed
//
- public bool FixIndependentTypeArguments (ResolveContext ec, Type[] methodParameters, ref bool fixed_any)
+ public bool FixIndependentTypeArguments (ResolveContext ec, TypeSpec[] methodParameters, ref bool fixed_any)
{
- var types_to_fix = new List<Type> (unfixed_types);
+ var types_to_fix = new List<TypeSpec> (unfixed_types);
for (int i = 0; i < methodParameters.Length; ++i) {
- Type t = methodParameters[i];
+ TypeSpec t = methodParameters[i];
if (!TypeManager.IsDelegateType (t)) {
- if (TypeManager.DropGenericTypeArguments (t) != TypeManager.expression_type)
+ if (TypeManager.expression_type == null || t.MemberDefinition != TypeManager.expression_type.MemberDefinition)
continue;
- t = t.GetGenericArguments () [0];
+ t = TypeManager.GetTypeArguments (t) [0];
}
if (t.IsGenericParameter)
continue;
- var invoke = Delegate.GetInvokeMethod (ec.Compiler, t, t);
- Type rtype = invoke.ReturnType;
- if (!rtype.IsGenericParameter && !rtype.IsGenericType)
+ var invoke = Delegate.GetInvokeMethod (ec.Compiler, t);
+ TypeSpec rtype = invoke.ReturnType;
+ if (!rtype.IsGenericParameter && !TypeManager.IsGenericType (rtype))
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) {
+ foreach (TypeSpec t in types_to_fix) {
if (t == null)
continue;
if (candidates.Count == 1) {
unfixed_types[i] = null;
- Type t = candidates[0].Type;
- if (t == TypeManager.null_type)
+ TypeSpec t = candidates[0].Type;
+ if (t == InternalType.Null)
return false;
fixed_types [i] = t;
// a standard implicit conversion to all the other
// candidate types.
//
- Type best_candidate = null;
+ TypeSpec best_candidate = null;
int cii;
int candidates_count = candidates.Count;
for (int ci = 0; ci < candidates_count; ++ci) {
- BoundInfo bound = (BoundInfo)candidates [ci];
+ BoundInfo bound = candidates [ci];
for (cii = 0; cii < candidates_count; ++cii) {
if (cii == ci)
continue;
- BoundInfo cbound = (BoundInfo) candidates[cii];
+ BoundInfo cbound = candidates[cii];
// Same type parameters with different bounds
if (cbound.Type == bound.Type) {
}
if (bound.Kind == BoundKind.Exact || cbound.Kind == BoundKind.Exact) {
- if (cbound.Kind != BoundKind.Exact) {
+ if (cbound.Kind == BoundKind.Lower) {
if (!Convert.ImplicitConversionExists (ec, new TypeExpression (cbound.Type, Location.Null), bound.Type)) {
break;
}
continue;
}
+ if (cbound.Kind == BoundKind.Upper) {
+ if (!Convert.ImplicitConversionExists (ec, new TypeExpression (bound.Type, Location.Null), cbound.Type)) {
+ break;
+ }
+
+ continue;
+ }
if (bound.Kind != BoundKind.Exact) {
if (!Convert.ImplicitConversionExists (ec, new TypeExpression (bound.Type, Location.Null), cbound.Type)) {
}
if (bound.Kind == BoundKind.Lower) {
- if (!Convert.ImplicitConversionExists (ec, new TypeExpression (cbound.Type, Location.Null), bound.Type)) {
- break;
+ if (cbound.Kind == BoundKind.Lower) {
+ if (!Convert.ImplicitConversionExists (ec, new TypeExpression (cbound.Type, Location.Null), bound.Type)) {
+ break;
+ }
+ } else {
+ if (!Convert.ImplicitConversionExists (ec, new TypeExpression (bound.Type, Location.Null), cbound.Type)) {
+ break;
+ }
+
+ bound = cbound;
}
- } else {
+
+ continue;
+ }
+
+ if (bound.Kind == BoundKind.Upper) {
if (!Convert.ImplicitConversionExists (ec, new TypeExpression (bound.Type, Location.Null), cbound.Type)) {
break;
}
+ } else {
+ throw new NotImplementedException ("variance conversion");
}
}
if (cii != candidates_count)
continue;
- if (best_candidate != null && best_candidate != bound.Type)
- return false;
+ //
+ // We already have the best candidate, break if thet are different
+ //
+ // Dynamic is never ambiguous as we prefer dynamic over other best candidate types
+ //
+ if (best_candidate != null) {
+
+ if (best_candidate == InternalType.Dynamic)
+ continue;
+
+ if (bound.Type != InternalType.Dynamic && best_candidate != bound.Type)
+ return false;
+ }
best_candidate = bound.Type;
}
}
//
- // Uses inferred types to inflate delegate type argument
+ // Uses inferred or partially infered types to inflate delegate type argument. Returns
+ // null when type parameter was not yet inferres
//
- public Type InflateGenericArgument (Type parameter)
+ public TypeSpec InflateGenericArgument (TypeSpec parameter)
{
- if (parameter.IsGenericParameter) {
+ var tp = parameter as TypeParameterSpec;
+ if (tp != null) {
//
- // Inflate method generic argument (MVAR) only
+ // Type inference work on generic arguments (MVAR) only
//
- if (parameter.DeclaringMethod == null)
+ if (!tp.IsMethodOwned)
return parameter;
- return fixed_types [parameter.GenericParameterPosition];
+ return fixed_types [tp.DeclaredPosition] ?? parameter;
}
- if (parameter.IsGenericType) {
- Type [] parameter_targs = parameter.GetGenericArguments ();
- for (int ii = 0; ii < parameter_targs.Length; ++ii) {
- parameter_targs [ii] = InflateGenericArgument (parameter_targs [ii]);
+ var gt = parameter as InflatedTypeSpec;
+ if (gt != null) {
+ var inflated_targs = new TypeSpec [gt.TypeArguments.Length];
+ for (int ii = 0; ii < inflated_targs.Length; ++ii) {
+ var inflated = InflateGenericArgument (gt.TypeArguments [ii]);
+ if (inflated == null)
+ return null;
+
+ inflated_targs[ii] = inflated;
}
- return parameter.GetGenericTypeDefinition ().MakeGenericType (parameter_targs);
+
+ return gt.GetDefinition ().MakeGenericType (inflated_targs);
}
return parameter;
// Tests whether all delegate input arguments are fixed and generic output type
// requires output type inference
//
- public bool IsReturnTypeNonDependent (ResolveContext ec, MethodSpec invoke, Type returnType)
+ public bool IsReturnTypeNonDependent (ResolveContext ec, MethodSpec invoke, TypeSpec returnType)
{
if (returnType.IsGenericParameter) {
if (IsFixed (returnType))
return false;
- } else if (returnType.IsGenericType) {
+ } else if (TypeManager.IsGenericType (returnType)) {
if (TypeManager.IsDelegateType (returnType)) {
- invoke = Delegate.GetInvokeMethod (ec.Compiler, returnType, returnType);
+ invoke = Delegate.GetInvokeMethod (ec.Compiler, returnType);
return IsReturnTypeNonDependent (ec, invoke, invoke.ReturnType);
}
- Type[] g_args = returnType.GetGenericArguments ();
+ TypeSpec[] g_args = TypeManager.GetTypeArguments (returnType);
// At least one unfixed return type has to exist
if (AllTypesAreFixed (g_args))
return AllTypesAreFixed (d_parameters.Types);
}
- bool IsFixed (Type type)
+ bool IsFixed (TypeSpec type)
{
return IsUnfixed (type) == -1;
}
- int IsUnfixed (Type type)
+ int IsUnfixed (TypeSpec type)
{
if (!type.IsGenericParameter)
return -1;
//
// 26.3.3.9 Lower-bound Inference
//
- public int LowerBoundInference (Type u, Type v)
+ public int LowerBoundInference (TypeSpec u, TypeSpec v)
{
return LowerBoundInference (u, v, false);
}
//
// Lower-bound (false) or Upper-bound (true) inference based on inversed argument
//
- int LowerBoundInference (Type u, Type v, bool inversed)
+ int LowerBoundInference (TypeSpec u, TypeSpec v, bool inversed)
{
// If V is one of the unfixed type arguments
int pos = IsUnfixed (v);
}
// If U is an array type
- if (u.IsArray) {
- int u_dim = u.GetArrayRank ();
- Type v_i;
- Type u_i = TypeManager.GetElementType (u);
-
- if (v.IsArray) {
- if (u_dim != v.GetArrayRank ())
+ var u_ac = u as ArrayContainer;
+ if (u_ac != null) {
+ var v_ac = v as ArrayContainer;
+ if (v_ac != null) {
+ if (u_ac.Rank != v_ac.Rank)
return 0;
- v_i = TypeManager.GetElementType (v);
+ if (TypeManager.IsValueType (u_ac.Element))
+ return ExactInference (u_ac.Element, v_ac.Element);
- if (TypeManager.IsValueType (u_i))
- return ExactInference (u_i, v_i);
-
- return LowerBoundInference (u_i, v_i, inversed);
+ return LowerBoundInference (u_ac.Element, v_ac.Element, inversed);
}
- if (u_dim != 1)
+ if (u_ac.Rank != 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))
+ if (TypeManager.IsGenericType (v)) {
+ TypeSpec g_v = v.GetDefinition ();
+ if (g_v != TypeManager.generic_ilist_type &&
+ g_v != TypeManager.generic_icollection_type &&
+ g_v != TypeManager.generic_ienumerable_type)
return 0;
- v_i = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (v) [0]);
- if (TypeManager.IsValueType (u_i))
- return ExactInference (u_i, v_i);
+ var v_i = TypeManager.GetTypeArguments (v) [0];
+ if (TypeManager.IsValueType (u_ac.Element))
+ return ExactInference (u_ac.Element, v_i);
- return LowerBoundInference (u_i, v_i);
+ return LowerBoundInference (u_ac.Element, v_i);
}
- } else if (v.IsGenericType && !v.IsGenericTypeDefinition) {
+ } else if (TypeManager.IsGenericType (v)) {
//
// if V is a constructed type C<V1..Vk> and there is a unique type C<U1..Uk>
// such that U is identical to, inherits from (directly or indirectly),
// or implements (directly or indirectly) C<U1..Uk>
//
- var u_candidates = new List<Type> ();
- if (u.IsGenericType)
- u_candidates.Add (u);
+ var u_candidates = new List<TypeSpec> ();
+ var open_v = v.MemberDefinition;
- for (Type t = u.BaseType; t != null; t = t.BaseType) {
- if (t.IsGenericType && !t.IsGenericTypeDefinition)
+ for (TypeSpec t = u; t != null; t = t.BaseType) {
+ if (open_v == t.MemberDefinition)
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;
+ if (t.Interfaces != null) {
+ foreach (var iface in t.Interfaces) {
+ if (open_v == iface.MemberDefinition)
+ u_candidates.Add (iface);
+ }
+ }
+ }
+ TypeSpec [] unique_candidate_targs = null;
+ TypeSpec[] ga_v = TypeManager.GetTypeArguments (v);
+ foreach (TypeSpec u_candidate in u_candidates) {
//
// The unique set of types U1..Uk means that if we have an interface I<T>,
// class U : I<int>, I<long> then no type inference is made when inferring
// type I<T> by applying type U 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)) {
+ TypeSpec[] second_unique_candidate_targs = TypeManager.GetTypeArguments (u_candidate);
+ if (TypeSpecComparer.Equals (unique_candidate_targs, second_unique_candidate_targs)) {
unique_candidate_targs = second_unique_candidate_targs;
continue;
}
return 1;
}
- unique_candidate_targs = u_candidate.GetGenericArguments ();
+ unique_candidate_targs = TypeManager.GetTypeArguments (u_candidate);
}
if (unique_candidate_targs != null) {
- Type[] ga_open_v = open_v.GetGenericArguments ();
+ var ga_open_v = open_v.TypeParameters;
int score = 0;
for (int i = 0; i < unique_candidate_targs.Length; ++i) {
- Variance variance = TypeManager.GetTypeParameterVariance (ga_open_v [i]);
+ Variance variance = ga_open_v [i].Variance;
- Type u_i = unique_candidate_targs [i];
+ TypeSpec u_i = unique_candidate_targs [i];
if (variance == Variance.None || TypeManager.IsValueType (u_i)) {
if (ExactInference (u_i, ga_v [i]) == 0)
++score;
//
// 26.3.3.6 Output Type Inference
//
- public int OutputTypeInference (ResolveContext ec, Expression e, Type t)
+ public int OutputTypeInference (ResolveContext ec, Expression e, TypeSpec 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);
- var invoke = Delegate.GetInvokeMethod (ec.Compiler, t, t);
+ TypeSpec rt = ame.InferReturnType (ec, this, t);
+ var invoke = Delegate.GetInvokeMethod (ec.Compiler, t);
if (rt == null) {
AParametersCollection pd = invoke.Parameters;
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
+ TypeSpec rtype = invoke.ReturnType;
return LowerBoundInference (rt, rtype) + 1;
}
// 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;
+ if (!TypeManager.IsDelegateType (t)) {
+ if (TypeManager.expression_type == null || t.MemberDefinition != TypeManager.expression_type.MemberDefinition)
+ return 0;
+
+ t = TypeManager.GetTypeArguments (t)[0];
+ }
- var invoke = Delegate.GetInvokeMethod (ec.Compiler, 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
+ var invoke = Delegate.GetInvokeMethod (ec.Compiler, t);
+ TypeSpec rtype = invoke.ReturnType;
- if (!TypeManager.IsGenericType (rtype))
+ if (!rtype.IsGenericParameter && !TypeManager.IsGenericType (rtype))
return 0;
+ // LAMESPEC: Standard does not specify that all methodgroup arguments
+ // has to be fixed but it does not specify how to do recursive type inference
+ // either. We choose the simple option and infer return type only
+ // if all delegate generic arguments are fixed.
+ TypeSpec[] param_types = new TypeSpec [invoke.Parameters.Count];
+ for (int i = 0; i < param_types.Length; ++i) {
+ var inflated = InflateGenericArgument (invoke.Parameters.Types[i]);
+ if (inflated == null)
+ return 0;
+
+ param_types[i] = inflated;
+ }
+
MethodGroupExpr mg = (MethodGroupExpr) e;
- Arguments args = DelegateCreation.CreateDelegateMethodArguments (invoke.Parameters, e.Location);
- mg = mg.OverloadResolve (ec, ref args, true, e.Location);
+ Arguments args = DelegateCreation.CreateDelegateMethodArguments (invoke.Parameters, param_types, e.Location);
+ mg = mg.OverloadResolve (ec, ref args, null, OverloadResolver.Restrictions.CovariantDelegate | OverloadResolver.Restrictions.ProbingOnly);
if (mg == null)
return 0;
- // TODO: What should happen when return type is of generic type ?
- throw new NotImplementedException ();
-// return LowerBoundInference (null, rtype) + 1;
+ return LowerBoundInference (mg.BestCandidate.ReturnType, rtype) + 1;
}
//
return LowerBoundInference (e.Type, t) * 2;
}
- void RemoveDependentTypes (List<Type> types, Type returnType)
+ void RemoveDependentTypes (List<TypeSpec> types, TypeSpec returnType)
{
int idx = IsUnfixed (returnType);
if (idx >= 0) {
return;
}
- if (returnType.IsGenericType) {
- foreach (Type t in returnType.GetGenericArguments ()) {
+ if (TypeManager.IsGenericType (returnType)) {
+ foreach (TypeSpec t in TypeManager.GetTypeArguments (returnType)) {
RemoveDependentTypes (types, t);
}
}
if (unfixed_types == null)
return false;
- foreach (Type ut in unfixed_types)
+ foreach (TypeSpec ut in unfixed_types)
if (ut != null)
return true;
return false;
projects / mono.git / blobdiff