using System.Reflection;
using System.Reflection.Emit;
using System.Globalization;
-using System.Collections;
+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;
- }
-
- public abstract GenericParameterAttributes Attributes {
- get;
- }
-
- public bool HasConstructorConstraint {
- get { return (Attributes & GenericParameterAttributes.DefaultConstructorConstraint) != 0; }
- }
-
- public bool HasReferenceTypeConstraint {
- get { return (Attributes & GenericParameterAttributes.ReferenceTypeConstraint) != 0; }
- }
+ [Flags]
+ public enum SpecialConstraint
+ {
+ None = 0,
+ Constructor = 1 << 2,
+ Class = 1 << 3,
+ Struct = 1 << 4
+ }
- public bool HasValueTypeConstraint {
- get { return (Attributes & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0; }
+ public class SpecialContraintExpr : FullNamedExpression
+ {
+ public SpecialContraintExpr (SpecialConstraint constraint, Location loc)
+ {
+ this.loc = loc;
+ this.Constraint = constraint;
}
- public virtual bool HasClassConstraint {
- get { return ClassConstraint != null; }
- }
+ public SpecialConstraint Constraint { get; private set; }
- public abstract Type ClassConstraint {
- get;
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ throw new NotImplementedException ();
}
+ }
- public abstract Type[] InterfaceConstraints {
- get;
+ //
+ // 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 abstract Type EffectiveBaseClass {
- get;
- }
+ #region Properties
- // <summary>
- // Returns whether the type parameter is "known to be a reference type".
- // </summary>
- public virtual bool IsReferenceType {
+ public Location Location {
get {
- if (HasReferenceTypeConstraint)
- return true;
- if (HasValueTypeConstraint)
- return false;
-
- if (ClassConstraint != null) {
- if (ClassConstraint.IsValueType)
- return false;
-
- if (ClassConstraint != TypeManager.object_type)
- return true;
- }
-
- foreach (Type t in InterfaceConstraints) {
- if (!t.IsGenericParameter)
- continue;
-
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
- if ((gc != null) && gc.IsReferenceType)
- return true;
- }
-
- return false;
+ return loc;
}
}
- // <summary>
- // Returns whether the type parameter is "known to be a value type".
- // </summary>
- public virtual bool IsValueType {
+ public SimpleMemberName TypeParameter {
get {
- if (HasValueTypeConstraint)
- return true;
- if (HasReferenceTypeConstraint)
- return false;
-
- if (ClassConstraint != null) {
- if (!ClassConstraint.IsValueType)
- return false;
-
- if (ClassConstraint != TypeManager.value_type)
- return true;
- }
-
- foreach (Type t in InterfaceConstraints) {
- if (!t.IsGenericParameter)
- continue;
-
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
- if ((gc != null) && gc.IsValueType)
- return true;
- }
-
- return false;
+ return tparam;
}
}
- }
- public enum SpecialConstraint
- {
- Constructor,
- ReferenceType,
- ValueType
- }
+ #endregion
- /// <summary>
- /// Tracks the constraints for a type parameter from a generic type definition.
- /// </summary>
- public class Constraints : GenericConstraints {
- string name;
- ArrayList constraints;
- Location loc;
-
- //
- // name is the identifier, constraints is an arraylist of
- // Expressions (with types) or `true' for the constructor constraint.
- //
- public Constraints (string name, ArrayList constraints,
- Location loc)
+ bool CheckConflictingInheritedConstraint (TypeSpec ba, TypeSpec bb, IMemberContext context, Location loc)
{
- this.name = name;
- this.constraints = constraints;
- this.loc = loc;
- }
-
- public override string TypeParameter {
- get {
- return name;
+ if (!TypeManager.IsSubclassOf (ba, bb) && !TypeManager.IsSubclassOf (bb, ba)) {
+ 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 Constraints Clone ()
+ public void CheckGenericConstraints (IMemberContext context)
{
- return new Constraints (name, constraints, loc);
+ foreach (var c in constraints) {
+ var ge = c as GenericTypeExpr;
+ if (ge != null)
+ ge.CheckConstraints (context);
+ }
}
- GenericParameterAttributes attrs;
- TypeExpr class_constraint;
- ArrayList iface_constraints;
- ArrayList type_param_constraints;
- int num_constraints;
- Type class_constraint_type;
- Type[] iface_constraint_types;
- Type effective_base_type;
- bool resolved;
- bool resolved_types;
-
- /// <summary>
- /// Resolve the constraints - but only resolve things into Expression's, not
- /// into actual types.
- /// </summary>
- public bool Resolve (IResolveContext ec)
+ //
+ // 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;
- iface_constraints = new ArrayList (2); // TODO: Too expensive allocation
- type_param_constraints = new ArrayList ();
-
- foreach (object obj in constraints) {
- if (HasConstructorConstraint) {
- Report.Error (401, loc,
- "The new() constraint must be the last constraint specified");
- return false;
- }
+ if (resolving)
+ return false;
- if (obj is SpecialConstraint) {
- SpecialConstraint sc = (SpecialConstraint) obj;
+ resolving = true;
+ var spec = tp.Type;
+ List<TypeParameterSpec> tparam_types = null;
+ bool iface_found = false;
- if (sc == SpecialConstraint.Constructor) {
- if (!HasValueTypeConstraint) {
- attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
- continue;
- }
+ spec.BaseType = TypeManager.object_type;
- Report.Error (451, loc, "The `new()' constraint " +
- "cannot be used with the `struct' constraint");
- return false;
- }
+ for (int i = 0; i < constraints.Count; ++i) {
+ var constraint = constraints[i];
- if ((num_constraints > 0) || HasReferenceTypeConstraint || HasValueTypeConstraint) {
- Report.Error (449, loc, "The `class' or `struct' " +
- "constraint must be the first constraint specified");
- return false;
- }
+ if (constraint is SpecialContraintExpr) {
+ spec.SpecialConstraint |= ((SpecialContraintExpr) constraint).Constraint;
+ if (spec.HasSpecialStruct)
+ spec.BaseType = TypeManager.value_type;
- if (sc == SpecialConstraint.ReferenceType)
- attrs |= GenericParameterAttributes.ReferenceTypeConstraint;
- else
- attrs |= GenericParameterAttributes.NotNullableValueTypeConstraint;
+ // Set to null as it does not have a type
+ constraints[i] = null;
continue;
}
- int errors = Report.Errors;
- FullNamedExpression fn = ((Expression) obj).ResolveAsTypeStep (ec, false);
-
- if (fn == null) {
- if (errors != Report.Errors)
- return false;
+ var type_expr = constraints[i] = constraint.ResolveAsTypeTerminal (context, false);
+ if (type_expr == null)
+ continue;
- NamespaceEntry.Error_NamespaceNotFound (loc, ((Expression)obj).GetSignatureForError ());
- return false;
+ 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;
}
- TypeExpr expr;
- GenericTypeExpr cexpr = fn as GenericTypeExpr;
- if (cexpr != null) {
- expr = cexpr.ResolveAsBaseTerminal (ec, false);
- } else
- expr = ((Expression) obj).ResolveAsTypeTerminal (ec, false);
-
- if ((expr == null) || (expr.Type == null))
- return false;
+ var type = type_expr.Type;
- if (!ec.GenericDeclContainer.IsAccessibleAs (fn.Type)) {
- Report.SymbolRelatedToPreviousError (fn.Type);
- Report.Error (703, loc,
+ 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}'",
- fn.GetSignatureForError (), ec.GenericDeclContainer.GetSignatureForError ());
- return false;
+ type.GetSignatureForError (), context.GetSignatureForError ());
}
- TypeParameterExpr texpr = expr as TypeParameterExpr;
- if (texpr != null)
- type_param_constraints.Add (expr);
- else if (expr.IsInterface)
- iface_constraints.Add (expr);
- else if (class_constraint != null || iface_constraints.Count != 0) {
- Report.Error (406, loc,
- "The class type constraint `{0}' must be listed before any other constraints. Consider moving type constraint to the beginning of the constraint list",
- expr.GetSignatureForError ());
- return false;
- } else if (HasReferenceTypeConstraint || HasValueTypeConstraint) {
- Report.Error (450, loc, "`{0}': cannot specify both " +
- "a constraint class and the `class' " +
- "or `struct' constraint", expr.GetSignatureForError ());
- return false;
- } else
- class_constraint = expr;
+ 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);
+ }
+
+ iface_found = true;
+ continue;
+ }
- num_constraints++;
- }
- ArrayList list = new ArrayList ();
- foreach (TypeExpr iface_constraint in iface_constraints) {
- foreach (Type type in list) {
- if (!type.Equals (iface_constraint.Type))
+ 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;
+ }
- Report.Error (405, loc,
- "Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", iface_constraint.GetSignatureForError (),
- name);
- return false;
- }
+ //
+ // Checks whether each generic method parameter constraint type
+ // is valid with respect to T
+ //
+ if (tp.IsMethodTypeParameter) {
+ TypeManager.CheckTypeVariance (type, Variance.Contravariant, context);
+ }
- list.Add (iface_constraint.Type);
- }
+ 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;
+ }
+ }
+ }
- foreach (TypeParameterExpr expr in type_param_constraints) {
- foreach (Type type in list) {
- if (!type.Equals (expr.Type))
+ 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;
+ }
- Report.Error (405, loc,
- "Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", expr.GetSignatureForError (), name);
- return false;
+ tparam_types.Add (constraint_tp);
+ continue;
}
- list.Add (expr.Type);
- }
+ 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 ());
+ }
- iface_constraint_types = new Type [list.Count];
- list.CopyTo (iface_constraint_types, 0);
+ 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 (class_constraint != null) {
- class_constraint_type = class_constraint.Type;
- if (class_constraint_type == null)
- return false;
+ if (type == InternalType.Dynamic) {
+ context.Compiler.Report.Error (1967, constraint.Location, "A constraint cannot be the dynamic type");
+ continue;
+ }
- if (class_constraint_type.IsSealed) {
- if (class_constraint_type.IsAbstract)
- {
- Report.Error (717, loc, "`{0}' is not a valid constraint. Static classes cannot be used as constraints",
- TypeManager.CSharpName (class_constraint_type));
- }
- else
- {
- Report.Error (701, loc, "`{0}' is not a valid constraint. A constraint must be an interface, " +
- "a non-sealed class or a type parameter", TypeManager.CSharpName(class_constraint_type));
- }
- return false;
+ if (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 ((class_constraint_type == TypeManager.array_type) ||
- (class_constraint_type == TypeManager.delegate_type) ||
- (class_constraint_type == TypeManager.enum_type) ||
- (class_constraint_type == TypeManager.value_type) ||
- (class_constraint_type == TypeManager.object_type) ||
- class_constraint_type == TypeManager.multicast_delegate_type) {
- Report.Error (702, loc,
- "A constraint cannot be special class `{0}'",
- TypeManager.CSharpName (class_constraint_type));
- return false;
+ if (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;
}
- }
- 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;
+ spec.BaseType = type;
+ }
- if ((attrs & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0)
- attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
+ if (tparam_types != null)
+ spec.TypeArguments = tparam_types.ToArray ();
+ resolving = false;
resolved = true;
return true;
}
- bool CheckTypeParameterConstraints (TypeParameter tparam, ref TypeExpr prevConstraint, ArrayList seen)
+ public void VerifyClsCompliance (Report report)
{
- seen.Add (tparam);
-
- Constraints constraints = 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);
- return false;
- }
-
- //
- // Checks whether there are no conflicts between type parameter constraints
- //
- // class Foo<T, U>
- // where T : A
- // where U : A, B // A and B are not convertible
- //
- if (constraints.HasClassConstraint) {
- if (prevConstraint != null) {
- Type t2 = constraints.ClassConstraint;
- TypeExpr e2 = constraints.class_constraint;
-
- 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 (var c in constraints)
+ {
+ if (c == null)
+ continue;
- foreach (TypeParameterExpr expr in constraints.type_param_constraints) {
- if (seen.Contains (expr.TypeParameter)) {
- Report.Error (454, loc, "Circular constraint " +
- "dependency involving `{0}' and `{1}'",
- tparam.Name, expr.GetSignatureForError ());
- return false;
+ if (!c.Type.IsCLSCompliant ()) {
+ report.SymbolRelatedToPreviousError (c.Type);
+ report.Warning (3024, 1, loc, "Constraint type `{0}' is not CLS-compliant",
+ c.Type.GetSignatureForError ());
}
-
- if (!CheckTypeParameterConstraints (expr.TypeParameter, ref prevConstraint, seen))
- return false;
}
-
- return true;
}
+ }
- /// <summary>
- /// Resolve the constraints into actual types.
- /// </summary>
- public bool ResolveTypes (IResolveContext ec)
- {
- if (resolved_types)
- return true;
-
- resolved_types = true;
-
- foreach (object obj in constraints) {
- GenericTypeExpr cexpr = obj as GenericTypeExpr;
- if (cexpr == null)
- continue;
+ //
+ // A type parameter for a generic type or generic method definition
+ //
+ public class TypeParameter : MemberCore, ITypeDefinition
+ {
+ static readonly string[] attribute_target = new string [] { "type parameter" };
+
+ Constraints constraints;
+ GenericTypeParameterBuilder builder;
+// Variance variance;
+ TypeParameterSpec spec;
- if (!cexpr.CheckConstraints (ec))
- return false;
- }
+ public TypeParameter (DeclSpace parent, int index, MemberName name, Constraints constraints, Attributes attrs, Variance variance)
+ : base (parent, name, attrs)
+ {
+ this.constraints = constraints;
+// this.variance = variance;
+ this.spec = new TypeParameterSpec (null, index, this, SpecialConstraint.None, variance, null);
+ }
- if (type_param_constraints.Count != 0) {
- ArrayList seen = new ArrayList ();
- TypeExpr prev_constraint = class_constraint;
- foreach (TypeParameterExpr expr in type_param_constraints) {
- if (!CheckTypeParameterConstraints (expr.TypeParameter, ref prev_constraint, seen))
- return false;
- seen.Clear ();
- }
- }
+ #region Properties
- for (int i = 0; i < iface_constraints.Count; ++i) {
- TypeExpr iface_constraint = (TypeExpr) iface_constraints [i];
- iface_constraint = iface_constraint.ResolveAsTypeTerminal (ec, false);
- if (iface_constraint == null)
- return false;
- iface_constraints [i] = iface_constraint;
+ public override AttributeTargets AttributeTargets {
+ get {
+ return AttributeTargets.GenericParameter;
}
+ }
- if (class_constraint != null) {
- class_constraint = class_constraint.ResolveAsTypeTerminal (ec, false);
- if (class_constraint == null)
- return false;
+ public override string DocCommentHeader {
+ get {
+ throw new InvalidOperationException (
+ "Unexpected attempt to get doc comment from " + this.GetType ());
}
-
- return true;
}
- public override GenericParameterAttributes Attributes {
- get { return attrs; }
+ public bool IsMethodTypeParameter {
+ get {
+ return spec.IsMethodOwned;
+ }
}
- public override bool HasClassConstraint {
- get { return class_constraint != null; }
+ public string Namespace {
+ get {
+ return null;
+ }
}
- public override Type ClassConstraint {
- get { return class_constraint_type; }
+ public TypeParameterSpec Type {
+ get {
+ return spec;
+ }
}
- public override Type[] InterfaceConstraints {
- get { return iface_constraint_types; }
+ public int TypeParametersCount {
+ get {
+ return 0;
+ }
}
- public override Type EffectiveBaseClass {
- get { return effective_base_type; }
+ public TypeParameterSpec[] TypeParameters {
+ get {
+ return null;
+ }
}
- public bool IsSubclassOf (Type t)
- {
- if ((class_constraint_type != null) &&
- class_constraint_type.IsSubclassOf (t))
- return true;
-
- if (iface_constraint_types == null)
- return false;
-
- foreach (Type iface in iface_constraint_types) {
- if (TypeManager.IsSubclassOf (iface, t))
- return true;
+ public override string[] ValidAttributeTargets {
+ get {
+ return attribute_target;
}
-
- return false;
}
- public Location Location {
+ public Variance Variance {
get {
- return loc;
+ return spec.Variance;
}
}
- /// <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)
- {
- if (gc.Attributes != attrs)
- return false;
+ #endregion
- if (HasClassConstraint != gc.HasClassConstraint)
- return false;
- if (HasClassConstraint && !TypeManager.IsEqual (gc.ClassConstraint, ClassConstraint))
- return false;
+ //
+ // 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 ();
- int gc_icount = gc.InterfaceConstraints != null ?
- gc.InterfaceConstraints.Length : 0;
- int icount = InterfaceConstraints != null ?
- InterfaceConstraints.Length : 0;
+ var new_constraints = tp.constraints;
+ if (new_constraints == null)
+ return true;
- if (gc_icount != icount)
+ // TODO: could create spec only
+ //tp.Define (null, -1, part.Definition);
+ tp.spec.DeclaringType = part.Definition;
+ if (!tp.ResolveConstraints (part))
return false;
- for (int i = 0; i < gc.InterfaceConstraints.Length; ++i) {
- Type iface = gc.InterfaceConstraints [i];
- if (iface.IsGenericType)
- iface = iface.GetGenericTypeDefinition ();
-
- bool ok = false;
- for (int ii = 0; i < InterfaceConstraints.Length; ++ii) {
- Type check = InterfaceConstraints [ii];
- if (check.IsGenericType)
- check = check.GetGenericTypeDefinition ();
-
- if (TypeManager.IsEqual (iface, check)) {
- ok = true;
- break;
- }
- }
-
- if (!ok)
- 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 void VerifyClsCompliance ()
+ public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
{
- if (class_constraint_type != null && !AttributeTester.IsClsCompliant (class_constraint_type))
- Warning_ConstrainIsNotClsCompliant (class_constraint_type, class_constraint.Location);
+ builder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
+ }
- if (iface_constraint_types != null) {
- for (int i = 0; i < iface_constraint_types.Length; ++i) {
- if (!AttributeTester.IsClsCompliant (iface_constraint_types [i]))
- Warning_ConstrainIsNotClsCompliant (iface_constraint_types [i],
- ((TypeExpr)iface_constraints [i]).Location);
+ public void CheckGenericConstraints ()
+ {
+ if (constraints != null)
+ constraints.CheckGenericConstraints (this);
+ }
+
+ public TypeParameter CreateHoistedCopy (TypeSpec declaringType)
+ {
+ return new TypeParameter (Parent, spec.DeclaredPosition, MemberName, constraints, null, spec.Variance) {
+ spec = new TypeParameterSpec (declaringType, spec.DeclaredPosition, spec.MemberDefinition, spec.SpecialConstraint, spec.Variance, null) {
+ BaseType = spec.BaseType,
+ InterfacesDefined = spec.InterfacesDefined,
+ TypeArguments = spec.TypeArguments
}
- }
+ };
}
- void Warning_ConstrainIsNotClsCompliant (Type t, Location loc)
+ public override bool Define ()
{
- Report.SymbolRelatedToPreviousError (t);
- Report.Warning (3024, 1, loc, "Constraint type `{0}' is not CLS-compliant",
- TypeManager.CSharpName (t));
+ return true;
}
- }
- /// <summary>
- /// A type parameter from a generic type definition.
- /// </summary>
- public class TypeParameter : MemberCore, IMemberContainer
- {
- static readonly string[] attribute_target = new string [] { "type parameter" };
-
- DeclSpace decl;
- GenericConstraints gc;
- Constraints constraints;
- GenericTypeParameterBuilder type;
- MemberCache member_cache;
+ //
+ // 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 TypeParameter (DeclSpace parent, DeclSpace decl, string name,
- Constraints constraints, Attributes attrs, Location loc)
- : base (parent, new MemberName (name, loc), attrs)
+ public void EmitConstraints (GenericTypeParameterBuilder builder)
{
- this.decl = decl;
- this.constraints = constraints;
+ 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 GenericConstraints GenericConstraints {
- get { return gc != null ? gc : constraints; }
+ 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 Constraints Constraints {
- get { return constraints; }
+ public TypeSpec GetAttributeCoClass ()
+ {
+ return null;
}
- public DeclSpace DeclSpace {
- get { return decl; }
+ public string GetAttributeDefaultMember ()
+ {
+ throw new NotSupportedException ();
}
- public Type Type {
- get { return type; }
+ public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
+ {
+ throw new NotSupportedException ();
}
- /// <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 override string GetSignatureForError ()
{
- if (this.type != null)
- throw new InvalidOperationException ();
+ return MemberName.Name;
+ }
- this.type = type;
- TypeManager.AddTypeParameter (type, this);
+ public MemberCache LoadMembers (TypeSpec declaringType)
+ {
+ throw new NotSupportedException ("Not supported for compiled definition");
}
- /// <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)
+ //
+ // Resolves all type parameter constraints
+ //
+ public bool ResolveConstraints (IMemberContext context)
{
- if (constraints != null) {
- if (!constraints.Resolve (ds)) {
- constraints = null;
- return false;
- }
- }
+ if (constraints != null)
+ return constraints.Resolve (context, this);
+ spec.BaseType = TypeManager.object_type;
return true;
}
- /// <summary>
- /// This is the third method which is called during the resolving
- /// process. We're called immediately after calling DefineConstraints()
- /// on all of the current class'es type parameters.
- ///
- /// Our job is to resolve the constraints to actual types.
- ///
- /// Note that we may have circular dependencies on type parameters - this
- /// is why Resolve() and ResolveType() are separate.
- /// </summary>
- public bool ResolveType (IResolveContext ec)
+ public static TypeParameter FindTypeParameter (TypeParameter[] tparams, string name)
{
- if (constraints != null) {
- if (!constraints.ResolveTypes (ec)) {
- constraints = null;
- return false;
- }
+ foreach (var tp in tparams) {
+ if (tp.Name == name)
+ return tp;
}
- return true;
+ return null;
}
- /// <summary>
- /// This is the fourth and last method which is called during the resolving
- /// process. We're called after everything is fully resolved and actually
- /// register the constraints with SRE and the TypeManager.
- /// </summary>
- public bool DefineType (IResolveContext ec)
+ public override bool IsClsComplianceRequired ()
{
- return DefineType (ec, null, null, false);
+ return false;
}
- /// <summary>
- /// This is the fith and last method which is called during the resolving
- /// process. We're called after everything is fully resolved and actually
- /// register the constraints with SRE and the TypeManager.
- ///
- /// The `builder', `implementing' and `is_override' arguments are only
- /// applicable to method type parameters.
- /// </summary>
- public bool DefineType (IResolveContext ec, MethodBuilder builder,
- MethodInfo implementing, bool is_override)
+ public new void VerifyClsCompliance ()
{
- if (!ResolveType (ec))
- return false;
+ if (constraints != null)
+ constraints.VerifyClsCompliance (Report);
+ }
+ }
- 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;
- }
+ [System.Diagnostics.DebuggerDisplay ("{DisplayDebugInfo()}")]
+ public class TypeParameterSpec : TypeSpec
+ {
+ public static readonly new TypeParameterSpec[] EmptyTypes = new TypeParameterSpec[0];
- MethodBase mb = TypeManager.DropGenericMethodArguments (implementing);
+ Variance variance;
+ SpecialConstraint spec;
+ readonly int tp_pos;
+ TypeSpec[] targs;
+ TypeSpec[] ifaces_defined;
- int pos = type.GenericParameterPosition;
- Type mparam = mb.GetGenericArguments () [pos];
- GenericConstraints temp_gc = ReflectionConstraints.GetConstraints (mparam);
+ //
+ // Creates type owned type parameter
+ //
+ 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;
+ }
- if (temp_gc != null)
- gc = new InflatedConstraints (temp_gc, implementing.DeclaringType);
- else if (constraints != null)
- gc = new InflatedConstraints (constraints, implementing.DeclaringType);
+ //
+ // Creates method owned type parameter
+ //
+ public TypeParameterSpec (int index, ITypeDefinition definition, SpecialConstraint spec, Variance variance, Type info)
+ : this (null, index, definition, spec, variance, info)
+ {
+ }
- 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;
- }
+ #region Properties
- if (!ok) {
- Report.SymbolRelatedToPreviousError (implementing);
-
- Report.Error (
- 425, Location, "The constraints for type " +
- "parameter `{0}' of method `{1}' must match " +
- "the constraints for type parameter `{2}' " +
- "of interface method `{3}'. Consider using " +
- "an explicit interface implementation instead",
- Name, TypeManager.CSharpSignature (builder),
- TypeManager.CSharpName (mparam), TypeManager.CSharpSignature (mb));
- return false;
- }
- } else if (DeclSpace is CompilerGeneratedClass) {
- TypeParameter[] tparams = DeclSpace.TypeParameters;
- Type[] types = new Type [tparams.Length];
- for (int i = 0; i < tparams.Length; i++)
- types [i] = tparams [i].Type;
-
- if (constraints != null)
- gc = new InflatedConstraints (constraints, types);
- } else {
- gc = (GenericConstraints) constraints;
+ public int DeclaredPosition {
+ get {
+ return tp_pos;
}
+ }
- if (gc == null)
- return true;
-
- if (gc.HasClassConstraint || gc.HasValueTypeConstraint)
- type.SetBaseTypeConstraint (gc.EffectiveBaseClass);
+ public bool HasSpecialConstructor {
+ get {
+ return (spec & SpecialConstraint.Constructor) != 0;
+ }
+ }
- type.SetInterfaceConstraints (gc.InterfaceConstraints);
- type.SetGenericParameterAttributes (gc.Attributes);
- TypeManager.RegisterBuilder (type, gc.InterfaceConstraints);
+ public bool HasSpecialClass {
+ get {
+ return (spec & SpecialConstraint.Class) != 0;
+ }
+ }
- return true;
+ public bool HasSpecialStruct {
+ get {
+ return (spec & SpecialConstraint.Struct) != 0;
+ }
}
- /// <summary>
- /// This is called for each part of a partial generic type definition.
- ///
- /// If `new_constraints' is not null and we don't already have constraints,
- /// they become our constraints. If we already have constraints, we must
- /// check that they're the same.
- /// con
- /// </summary>
- public bool UpdateConstraints (IResolveContext ec, Constraints new_constraints)
- {
- if (type == null)
- throw new InvalidOperationException ();
+ public bool HasTypeConstraint {
+ get {
+ return BaseType != TypeManager.object_type && BaseType != TypeManager.value_type;
+ }
+ }
- if (new_constraints == null)
- return true;
+ 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);
+ }
+ }
+ }
+ }
- if (!new_constraints.Resolve (ec))
- return false;
- if (!new_constraints.ResolveTypes (ec))
- return false;
+ if (ifaces_defined == null && ifaces != null)
+ ifaces_defined = ifaces.ToArray ();
- if (constraints != null)
- return constraints.AreEqual (new_constraints);
+ state |= StateFlags.InterfacesExpanded;
+ }
- constraints = new_constraints;
- return true;
+ return ifaces;
+ }
}
- public override void Emit ()
- {
- if (OptAttributes != null)
- OptAttributes.Emit ();
+ //
+ // Unexpanded interfaces list
+ //
+ public TypeSpec[] InterfacesDefined {
+ get {
+ if (ifaces_defined == null && ifaces != null)
+ ifaces_defined = ifaces.ToArray ();
- base.Emit ();
+ return ifaces_defined;
+ }
+ set {
+ ifaces_defined = value;
+ }
}
- public override string DocCommentHeader {
+ public bool IsConstrained {
get {
- throw new InvalidOperationException (
- "Unexpected attempt to get doc comment from " + this.GetType () + ".");
+ return spec != SpecialConstraint.None || ifaces != null || targs != null || HasTypeConstraint;
}
}
//
- // MemberContainer
+ // Returns whether the type parameter is "known to be a reference type"
//
+ public bool IsReferenceType {
+ get {
+ return (spec & SpecialConstraint.Class) != 0 || HasTypeConstraint;
+ }
+ }
- public override bool Define ()
- {
- return true;
+ public bool IsValueType { // TODO: Do I need this ?
+ get {
+ // TODO MemberCache: probably wrong
+ return HasSpecialStruct;
+ }
}
- public override void ApplyAttributeBuilder (Attribute a,
- CustomAttributeBuilder cb)
- {
- type.SetCustomAttribute (cb);
+ public override string Name {
+ get {
+ return definition.Name;
+ }
}
- public override AttributeTargets AttributeTargets {
+ public bool IsMethodOwned {
get {
- return AttributeTargets.GenericParameter;
+ return DeclaringType == null;
}
}
- public override string[] ValidAttributeTargets {
+ public SpecialConstraint SpecialConstraint {
get {
- return attribute_target;
+ return spec;
+ }
+ set {
+ spec = value;
}
}
//
- // IMemberContainer
+ // Types used to inflate the generic type
//
-
- string IMemberContainer.Name {
- get { return Name; }
+ public new TypeSpec[] TypeArguments {
+ get {
+ return targs;
+ }
+ set {
+ targs = value;
+ }
}
- MemberCache IMemberContainer.BaseCache {
+ public Variance Variance {
get {
- if (gc == null)
- return null;
-
- if (gc.EffectiveBaseClass.BaseType == null)
- return null;
-
- return TypeManager.LookupMemberCache (gc.EffectiveBaseClass.BaseType);
+ return variance;
}
}
- bool IMemberContainer.IsInterface {
- get { return false; }
- }
+ #endregion
- MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
+ public string DisplayDebugInfo ()
{
- throw new NotSupportedException ();
+ var s = GetSignatureForError ();
+ return IsMethodOwned ? s + "!!" : s + "!";
}
- public MemberCache MemberCache {
- get {
- if (member_cache != null)
- return member_cache;
-
- if (gc == null)
- return null;
+ //
+ // Finds effective base class
+ //
+ public TypeSpec GetEffectiveBase ()
+ {
+ if (HasSpecialStruct) {
+ return TypeManager.value_type;
+ }
- Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
- member_cache = new MemberCache (this, gc.EffectiveBaseClass, ifaces);
+ if (BaseType != null && targs == null)
+ return BaseType;
- return member_cache;
+ var types = targs;
+ if (HasTypeConstraint) {
+ Array.Resize (ref types, types.Length + 1);
+ types[types.Length - 1] = BaseType;
}
+
+ if (types != null)
+ return Convert.FindMostEncompassedType (types.Select (l => l.BaseType));
+
+ return TypeManager.object_type;
}
- public MemberList FindMembers (MemberTypes mt, BindingFlags bf,
- MemberFilter filter, object criteria)
+ public override string GetSignatureForError ()
{
- if (gc == null)
- return MemberList.Empty;
-
- ArrayList members = new ArrayList ();
+ return Name;
+ }
- if (gc.HasClassConstraint) {
- MemberList list = TypeManager.FindMembers (
- gc.ClassConstraint, mt, bf, filter, criteria);
+ //
+ // 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;
- members.AddRange (list);
- }
+ if (BaseType != other.BaseType)
+ return false;
- Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
- foreach (Type t in ifaces) {
- MemberList list = TypeManager.FindMembers (
- t, mt, bf, filter, criteria);
+ if (!TypeSpecComparer.Override.IsSame (InterfacesDefined, other.InterfacesDefined))
+ return false;
- members.AddRange (list);
- }
+ if (!TypeSpecComparer.Override.IsSame (targs, other.targs))
+ return false;
- return new MemberList (members);
+ return true;
}
- public bool IsSubclassOf (Type t)
+ //
+ // Constraints have to match by using same set of types, used by
+ // implicit interface implementation
+ //
+ public bool HasSameConstraintsImplementation (TypeParameterSpec other)
{
- if (type.Equals (t))
- return true;
+ if (spec != other.spec)
+ return false;
- if (constraints != null)
- return constraints.IsSubclassOf (t);
+ //
+ // It can be same base type or inflated type parameter
+ //
+ // interface I<T> { void Foo<U> where U : T; }
+ // class A : I<int> { void Foo<X> where X : int {} }
+ //
+ bool found;
+ if (BaseType != other.BaseType) {
+ if (other.targs == null)
+ return false;
- return false;
- }
+ found = false;
+ foreach (var otarg in other.targs) {
+ if (TypeSpecComparer.Override.IsEqual (BaseType, otarg)) {
+ found = true;
+ break;
+ }
+ }
- public void InflateConstraints (Type declaring)
- {
- if (constraints != null)
- gc = new InflatedConstraints (constraints, declaring);
- }
-
- public override bool IsClsComplianceRequired ()
- {
- return false;
- }
+ if (!found)
+ return false;
+ }
- protected class InflatedConstraints : GenericConstraints
- {
- GenericConstraints gc;
- Type base_type;
- Type class_constraint;
- Type[] iface_constraints;
- Type[] dargs;
+ // 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;
+ }
+ }
+ }
- public InflatedConstraints (GenericConstraints gc, Type declaring)
- : this (gc, TypeManager.GetTypeArguments (declaring))
- { }
+ if (found)
+ continue;
- public InflatedConstraints (GenericConstraints gc, Type[] dargs)
- {
- this.gc = gc;
- this.dargs = dargs;
-
- ArrayList list = new ArrayList ();
- if (gc.HasClassConstraint)
- list.Add (inflate (gc.ClassConstraint));
- foreach (Type iface in gc.InterfaceConstraints)
- list.Add (inflate (iface));
-
- bool has_class_constr = false;
- if (list.Count > 0) {
- Type first = (Type) list [0];
- has_class_constr = !first.IsGenericParameter && !first.IsInterface;
- }
+ if (other.targs != null) {
+ foreach (var otarg in other.targs) {
+ if (TypeSpecComparer.Override.IsEqual (BaseType, otarg)) {
+ found = true;
+ break;
+ }
+ }
+ }
- if ((list.Count > 0) && has_class_constr) {
- class_constraint = (Type) list [0];
- iface_constraints = new Type [list.Count - 1];
- list.CopyTo (1, iface_constraints, 0, list.Count - 1);
- } else {
- iface_constraints = new Type [list.Count];
- list.CopyTo (iface_constraints, 0);
+ if (!found)
+ return false;
}
-
- if (HasValueTypeConstraint)
- base_type = TypeManager.value_type;
- else if (class_constraint != null)
- base_type = class_constraint;
- else
- base_type = TypeManager.object_type;
}
- Type inflate (Type t)
- {
- if (t == null)
- return null;
- if (t.IsGenericParameter)
- return t.GenericParameterPosition < dargs.Length ? dargs [t.GenericParameterPosition] : t;
- if (t.IsGenericType) {
- Type[] args = t.GetGenericArguments ();
- Type[] inflated = new Type [args.Length];
+ // Check interfaces implementation <- definition
+ if (other.InterfacesDefined != null) {
+ if (InterfacesDefined == null)
+ return false;
- for (int i = 0; i < args.Length; i++)
- inflated [i] = inflate (args [i]);
+ foreach (var oiface in other.InterfacesDefined) {
+ found = false;
+ foreach (var iface in InterfacesDefined) {
+ if (TypeSpecComparer.Override.IsEqual (iface, oiface)) {
+ found = true;
+ break;
+ }
+ }
- t = t.GetGenericTypeDefinition ();
- t = t.MakeGenericType (inflated);
+ if (!found)
+ return false;
}
-
- return t;
}
- public override string TypeParameter {
- get { return gc.TypeParameter; }
- }
+ // Check type parameters implementation -> definition
+ if (targs != null) {
+ if (other.targs == null)
+ return false;
- public override GenericParameterAttributes Attributes {
- get { return gc.Attributes; }
- }
+ foreach (var targ in targs) {
+ found = false;
+ foreach (var otarg in other.targs) {
+ if (TypeSpecComparer.Override.IsEqual (targ, otarg)) {
+ found = true;
+ break;
+ }
+ }
- public override Type ClassConstraint {
- get { return class_constraint; }
+ if (!found)
+ return false;
+ }
}
- public override Type EffectiveBaseClass {
- get { return base_type; }
- }
+ // 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 Type[] InterfaceConstraints {
- get { return iface_constraints; }
- }
- }
- }
+ if (targs == null)
+ return false;
- /// <summary>
- /// A TypeExpr which already resolved to a type parameter.
- /// </summary>
- public class TypeParameterExpr : TypeExpr {
- TypeParameter type_parameter;
+ found = false;
+ foreach (var targ in targs) {
+ if (TypeSpecComparer.Override.IsEqual (targ, otarg)) {
+ found = true;
+ break;
+ }
+ }
- public TypeParameter TypeParameter {
- get {
- return type_parameter;
+ if (!found)
+ return false;
+ }
}
- }
-
- public TypeParameterExpr (TypeParameter type_parameter, Location loc)
- {
- this.type_parameter = type_parameter;
- this.loc = loc;
- }
- protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
- {
- throw new NotSupportedException ();
+ return true;
}
- public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
+ public static TypeParameterSpec[] InflateConstraints (TypeParameterInflator inflator, TypeParameterSpec[] tparams)
{
- type = type_parameter.Type;
- eclass = ExprClass.TypeParameter;
- return this;
- }
+ TypeParameterSpec[] constraints = null;
- public override bool IsInterface {
- get { 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);
+ }
- public override bool CheckAccessLevel (DeclSpace ds)
- {
- return true;
+ constraints[i] = (TypeParameterSpec) constraints[i].InflateMember (inflator);
+ }
+ }
+
+ if (constraints == null)
+ constraints = tparams;
+
+ return constraints;
}
- }
- //
- // Tracks the type arguments when instantiating a generic type. It's used
- // by both type arguments and type parameters
- //
- public class TypeArguments {
- ArrayList args;
- Type[] atypes;
-
- public TypeArguments ()
+ public override MemberSpec InflateMember (TypeParameterInflator inflator)
{
- args = new ArrayList ();
+ var tps = (TypeParameterSpec) MemberwiseClone ();
+ 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 tps;
}
- public TypeArguments (params FullNamedExpression[] types)
+ //
+ // 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)
{
- this.args = new ArrayList (types);
+ cache = new MemberCache ();
+ if (ifaces != null) {
+ foreach (var iface_type in Interfaces) {
+ cache.AddInterface (iface_type);
+ }
+ }
}
- public void Add (FullNamedExpression type)
+ public bool IsConvertibleToInterface (TypeSpec iface)
{
- args.Add (type);
+ if (Interfaces != null) {
+ foreach (var t in Interfaces) {
+ if (t == iface)
+ return true;
+ }
+ }
+
+ if (TypeArguments != null) {
+ foreach (var t in TypeArguments) {
+ if (((TypeParameterSpec) t).IsConvertibleToInterface (iface))
+ return true;
+ }
+ }
+
+ return false;
}
- public void Add (TypeArguments new_args)
+ public override TypeSpec Mutate (TypeParameterMutator mutator)
{
- args.AddRange (new_args.args);
+ return mutator.Mutate (this);
}
+ }
- // TODO: Should be deleted
- public TypeParameterName[] GetDeclarations ()
+ public struct TypeParameterInflator
+ {
+ readonly TypeSpec type;
+ readonly TypeParameterSpec[] tparams;
+ readonly TypeSpec[] targs;
+
+ public TypeParameterInflator (TypeParameterInflator nested, TypeSpec type)
+ : this (type, nested.tparams, nested.targs)
{
- return (TypeParameterName[]) args.ToArray (typeof (TypeParameterName));
}
- /// <summary>
- /// We may only be used after Resolve() is called and return the fully
- /// resolved types.
- /// </summary>
- public Type[] Arguments {
- get {
- return atypes;
- }
+ public TypeParameterInflator (TypeSpec type, TypeParameterSpec[] tparams, TypeSpec[] targs)
+ {
+ if (tparams.Length != targs.Length)
+ throw new ArgumentException ("Invalid arguments");
+
+ this.tparams = tparams;
+ this.targs = targs;
+ this.type = type;
}
- public int Count {
+ //
+ // Type parameters to inflate
+ //
+ public TypeParameterSpec[] TypeParameters {
get {
- return args.Count;
+ return tparams;
}
}
- public string GetSignatureForError()
+ public TypeSpec Inflate (TypeSpec ts)
{
- StringBuilder sb = new StringBuilder();
- for (int i = 0; i < Count; ++i)
- {
- Expression expr = (Expression)args [i];
- sb.Append(expr.GetSignatureForError());
- if (i + 1 < Count)
- sb.Append(',');
- }
- return sb.ToString();
- }
+ var tp = ts as TypeParameterSpec;
+ if (tp != null)
+ return Inflate (tp);
- /// <summary>
- /// Resolve the type arguments.
- /// </summary>
- public bool Resolve (IResolveContext ec)
- {
- if (atypes != null)
- return atypes.Length != 0;
+ var ac = ts as ArrayContainer;
+ if (ac != null) {
+ var et = Inflate (ac.Element);
+ if (et != ac.Element)
+ return ArrayContainer.MakeType (et, ac.Rank);
- int count = args.Count;
- bool ok = true;
+ return ac;
+ }
- atypes = new Type [count];
+ //
+ // 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;
- for (int i = 0; i < count; i++){
- TypeExpr te = ((FullNamedExpression) args[i]).ResolveAsTypeTerminal (ec, false);
- if (te == null) {
- ok = false;
- continue;
- }
+ //
+ // 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, targs.Length);
- atypes[i] = te.Type;
+ //
+ // 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]);
- if (te.Type.IsSealed && te.Type.IsAbstract) {
- Report.Error (718, te.Location, "`{0}': static classes cannot be used as generic arguments",
- te.GetSignatureForError ());
- ok = false;
- }
+ ts = ts.MakeGenericType (inflated_targs);
+ }
- if (te.Type.IsPointer || TypeManager.IsSpecialType (te.Type)) {
- Report.Error (306, te.Location,
- "The type `{0}' may not be used as a type argument",
- te.GetSignatureForError ());
- ok = false;
+ return ts;
}
}
- if (!ok)
- atypes = Type.EmptyTypes;
+ // Inflate generic type
+ if (ts.Arity > 0)
+ return InflateTypeParameters (ts);
- return ok;
+ return ts;
}
- public TypeArguments Clone ()
+ public TypeSpec Inflate (TypeParameterSpec tp)
{
- TypeArguments copy = new TypeArguments ();
- foreach (Expression ta in args)
- copy.args.Add (ta);
+ for (int i = 0; i < tparams.Length; ++i)
+ if (tparams [i] == tp)
+ return targs[i];
- return copy;
+ // This can happen when inflating nested types
+ // without type arguments specified
+ return tp;
}
- }
-
- public class TypeParameterName : SimpleName
- {
- Attributes attributes;
- public TypeParameterName (string name, Attributes attrs, Location loc)
- : base (name, loc)
+ //
+ // Inflates generic types
+ //
+ TypeSpec InflateTypeParameters (TypeSpec type)
{
- attributes = attrs;
- }
+ var targs = new TypeSpec[type.Arity];
+ var i = 0;
- public Attributes OptAttributes {
- get {
- return attributes;
+ var gti = type as InflatedTypeSpec;
+
+ //
+ // 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]);
+
+ return gti.GetDefinition ().MakeGenericType (targs);
}
+
+ //
+ // 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);
+
+ return type.MakeGenericType (targs);
+ }
+
+ public TypeSpec TypeInstance {
+ get { return type; }
}
}
- /// <summary>
- /// A reference expression to generic type
- /// </summary>
- class GenericTypeExpr : TypeExpr
+ //
+ // 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
{
- TypeArguments args;
- Type[] gen_params; // TODO: Waiting for constrains check cleanup
- Type open_type;
+ TypeParameter[] mvar;
+ TypeParameter[] var;
+ Dictionary<TypeSpec, TypeSpec> mutated_typespec = new Dictionary<TypeSpec, TypeSpec> ();
- //
- // 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)
+ public TypeParameterMutator (TypeParameter[] mvar, TypeParameter[] var)
{
- open_type = gType.TypeBuilder.GetGenericTypeDefinition ();
-
- args = new TypeArguments ();
- foreach (TypeParameter type_param in gType.TypeParameters)
- args.Add (new TypeParameterExpr (type_param, l));
+ if (mvar.Length != var.Length)
+ throw new ArgumentException ();
- this.loc = l;
+ this.mvar = mvar;
+ this.var = var;
}
- /// <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 TypeSpec Mutate (TypeSpec ts)
{
- open_type = t.GetGenericTypeDefinition ();
+ TypeSpec value;
+ if (mutated_typespec.TryGetValue (ts, out value))
+ return value;
- loc = l;
- this.args = args;
+ value = ts.Mutate (this);
+ mutated_typespec.Add (ts, value);
+ return value;
}
- public TypeArguments TypeArguments {
- get { return args; }
+ public FieldInfo Mutate (FieldSpec fs)
+ {
+ // TODO:
+ return fs.GetMetaInfo ();
}
- public override string GetSignatureForError ()
+ public TypeParameterSpec Mutate (TypeParameterSpec tp)
{
- return TypeManager.CSharpName (type);
+ for (int i = 0; i < mvar.Length; ++i) {
+ if (mvar[i].Type == tp)
+ return var[i].Type;
+ }
+
+ return tp;
}
- protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
+ public TypeSpec[] Mutate (TypeSpec[] targs)
{
- if (eclass != ExprClass.Invalid)
- return this;
+ 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];
+ }
- eclass = ExprClass.Type;
+ return changed ? mutated : targs;
+ }
+ }
- if (!args.Resolve (ec))
- return null;
+ /// <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;
+ }
- gen_params = open_type.GetGenericArguments ();
- Type[] atypes = args.Arguments;
-
- if (atypes.Length != gen_params.Length) {
- Namespace.Error_InvalidNumberOfTypeArguments (open_type, loc);
- return null;
- }
+ protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
+ {
+ throw new NotSupportedException ();
+ }
- //
- // Now bind the parameters
- //
- type = open_type.MakeGenericType (atypes);
+ public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
+ {
return this;
}
- /// <summary>
- /// Check the constraints; we're called from ResolveAsTypeTerminal()
- /// after fully resolving the constructed type.
- /// </summary>
- public bool CheckConstraints (IResolveContext ec)
+ public override bool CheckAccessLevel (IMemberContext ds)
{
- return ConstraintChecker.CheckConstraints (ec, open_type, gen_params, args.Arguments, loc);
+ return true;
}
+ }
+
+ public class InflatedTypeSpec : TypeSpec
+ {
+ TypeSpec[] targs;
+ TypeParameterSpec[] constraints;
+ readonly TypeSpec open_type;
- public override bool CheckAccessLevel (DeclSpace ds)
+ public InflatedTypeSpec (TypeSpec openType, TypeSpec declaringType, TypeSpec[] targs)
+ : base (openType.Kind, declaringType, openType.MemberDefinition, null, openType.Modifiers)
{
- return ds.CheckAccessLevel (open_type);
+ if (targs == null)
+ throw new ArgumentNullException ("targs");
+
+// this.state = openType.state;
+ this.open_type = openType;
+ this.targs = targs;
}
- public override bool AsAccessible (DeclSpace ds)
- {
- foreach (Type t in args.Arguments) {
- if (!ds.IsAccessibleAs (t))
- return false;
- }
+ #region Properties
- return ds.IsAccessibleAs (open_type);
+ public override TypeSpec BaseType {
+ get {
+ if (cache == null || (state & StateFlags.PendingBaseTypeInflate) != 0)
+ InitializeMemberCache (true);
+
+ return base.BaseType;
+ }
}
- public override bool IsClass {
- get { return open_type.IsClass; }
+ //
+ // Inflated type parameters with constraints array, mapping with type arguments is based on index
+ //
+ public TypeParameterSpec[] Constraints {
+ get {
+ if (constraints == null) {
+ var inflator = new TypeParameterInflator (this, MemberDefinition.TypeParameters, targs);
+ constraints = TypeParameterSpec.InflateConstraints (inflator, MemberDefinition.TypeParameters);
+ }
+
+ return constraints;
+ }
}
- public override bool IsValueType {
- get { return TypeManager.IsStruct (open_type); }
+ public override IList<TypeSpec> Interfaces {
+ get {
+ if (cache == null)
+ InitializeMemberCache (true);
+
+ return base.Interfaces;
+ }
}
- public override bool IsInterface {
- get { return open_type.IsInterface; }
+ public override MemberCache MemberCacheTypes {
+ get {
+ if (cache == null)
+ InitializeMemberCache (true);
+
+ return cache;
+ }
}
- public override bool IsSealed {
- get { return open_type.IsSealed; }
+ //
+ // Types used to inflate the generic type
+ //
+ public override TypeSpec[] TypeArguments {
+ get {
+ return targs;
+ }
}
- public override bool Equals (object obj)
+ #endregion
+
+ Type CreateMetaInfo (TypeParameterMutator mutator)
{
- GenericTypeExpr cobj = obj as GenericTypeExpr;
- if (cobj == null)
- return false;
+ //
+ // 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 ()));
+ }
- if ((type == null) || (cobj.type == null))
- return false;
+ definition = definition.GetDefinition ();
+ type = type.DeclaringType;
+ } while (type != null);
- return type == cobj.type;
+ return definition.GetMetaInfo ().MakeGenericType (all.ToArray ());
}
- public override int GetHashCode ()
+ public override ObsoleteAttribute GetAttributeObsolete ()
{
- return base.GetHashCode ();
+ return open_type.GetAttributeObsolete ();
}
- }
- public abstract class ConstraintChecker
- {
- protected readonly Type[] gen_params;
- protected readonly Type[] atypes;
- protected readonly Location loc;
+ protected override bool IsNotCLSCompliant ()
+ {
+ if (base.IsNotCLSCompliant ())
+ return true;
- protected ConstraintChecker (Type[] gen_params, Type[] atypes, Location loc)
+ foreach (var ta in TypeArguments) {
+ if (ta.MemberDefinition.IsNotCLSCompliant ())
+ return true;
+ }
+
+ return false;
+ }
+
+ public override TypeSpec GetDefinition ()
{
- this.gen_params = gen_params;
- this.atypes = atypes;
- this.loc = loc;
+ return open_type;
}
- /// <summary>
- /// Check the constraints; we're called from ResolveAsTypeTerminal()
- /// after fully resolving the constructed type.
- /// </summary>
- public bool CheckConstraints (IResolveContext ec)
+ public override Type GetMetaInfo ()
{
- for (int i = 0; i < gen_params.Length; i++) {
- if (!CheckConstraints (ec, i))
- return false;
- }
+ if (info == null)
+ info = CreateMetaInfo (null);
- return true;
+ return info;
}
- protected bool CheckConstraints (IResolveContext ec, int index)
+ public override string GetSignatureForError ()
{
- Type atype = atypes [index];
- Type ptype = gen_params [index];
+ if (TypeManager.IsNullableType (open_type))
+ return targs[0].GetSignatureForError () + "?";
- if (atype == ptype)
- return true;
+ if (MemberDefinition is AnonymousTypeClass)
+ return ((AnonymousTypeClass) MemberDefinition).GetSignatureForError ();
- Expression aexpr = new EmptyExpression (atype);
+ return base.GetSignatureForError ();
+ }
- GenericConstraints gc = TypeManager.GetTypeParameterConstraints (ptype);
- if (gc == null)
- return true;
+ protected override string GetTypeNameSignature ()
+ {
+ if (targs.Length == 0 || MemberDefinition is AnonymousTypeClass)
+ return null;
+
+ return "<" + TypeManager.CSharpName (targs) + ">";
+ }
+
+ protected override void InitializeMemberCache (bool onlyTypes)
+ {
+ if (cache == null)
+ cache = new MemberCache (open_type.MemberCache);
- bool is_class, is_struct;
- if (atype.IsGenericParameter) {
- GenericConstraints agc = TypeManager.GetTypeParameterConstraints (atype);
- if (agc != null) {
- if (agc is Constraints)
- ((Constraints) agc).Resolve (ec);
- is_class = agc.IsReferenceType;
- is_struct = agc.IsValueType;
+ 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 {
- is_class = is_struct = false;
+ tparams_full = open_type.MemberDefinition.TypeParameters;
}
+ } else if (targs.Length == 0) {
+ tparams_full = TypeParameterSpec.EmptyTypes;
} else {
-#if MS_COMPATIBLE
- is_class = false;
- if (!atype.IsGenericType)
-#endif
- is_class = atype.IsClass || atype.IsInterface;
- is_struct = TypeManager.IsValueType (atype) && !TypeManager.IsNullableType (atype);
+ tparams_full = open_type.MemberDefinition.TypeParameters;
}
+ var inflator = new TypeParameterInflator (this, tparams_full, targs_full);
+
//
- // First, check the `class' and `struct' constraints.
+ // Two stage inflate due to possible nested types recursive
+ // references
//
- if (gc.HasReferenceTypeConstraint && !is_class) {
- Report.Error (452, loc, "The type `{0}' must be " +
- "a reference type in order to use it " +
- "as type parameter `{1}' in the " +
- "generic type or method `{2}'.",
- TypeManager.CSharpName (atype),
- TypeManager.CSharpName (ptype),
- GetSignatureForError ());
- return false;
- } else if (gc.HasValueTypeConstraint && !is_struct) {
- Report.Error (453, loc, "The type `{0}' must be a " +
- "non-nullable value type in order to use it " +
- "as type parameter `{1}' in the " +
- "generic type or method `{2}'.",
- TypeManager.CSharpName (atype),
- TypeManager.CSharpName (ptype),
- GetSignatureForError ());
- return false;
- }
-
+ // class A<T> {
+ // B b;
+ // class B {
+ // T Value;
+ // }
+ // }
//
- // The class constraint comes next.
+ // When resolving type of `b' members of `B' cannot be
+ // inflated because are not yet available in membercache
//
- if (gc.HasClassConstraint) {
- if (!CheckConstraint (ec, ptype, aexpr, gc.ClassConstraint))
- return false;
- }
+ if ((state & StateFlags.PendingMemberCacheMembers) == 0) {
+ open_type.MemberCache.InflateTypes (cache, inflator);
- //
- // Now, check the interface constraints.
- //
- if (gc.InterfaceConstraints != null) {
- foreach (Type it in gc.InterfaceConstraints) {
- if (!CheckConstraint (ec, ptype, aexpr, it))
- return false;
+ //
+ // 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);
+ }
}
- }
- //
- // Finally, check the constructor constraint.
- //
+ //
+ // 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);
+ }
+ } else if ((state & StateFlags.PendingBaseTypeInflate) != 0) {
+ BaseType = inflator.Inflate (open_type.BaseType);
+ state &= ~StateFlags.PendingBaseTypeInflate;
+ }
- if (!gc.HasConstructorConstraint)
- return true;
+ if (onlyTypes) {
+ state |= StateFlags.PendingMemberCacheMembers;
+ return;
+ }
- if (TypeManager.IsBuiltinType (atype) || TypeManager.IsValueType (atype))
- return true;
+ var tc = open_type.MemberDefinition as TypeContainer;
+ if (tc != null && !tc.HasMembersDefined)
+ throw new InternalErrorException ("Inflating MemberCache with undefined members");
- if (HasDefaultConstructor (atype))
- return true;
+ if ((state & StateFlags.PendingBaseTypeInflate) != 0) {
+ BaseType = inflator.Inflate (open_type.BaseType);
+ state &= ~StateFlags.PendingBaseTypeInflate;
+ }
- 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;
+ state &= ~StateFlags.PendingMemberCacheMembers;
+ open_type.MemberCache.InflateMembers (cache, open_type, inflator);
}
- protected bool CheckConstraint (IResolveContext ec, Type ptype, Expression expr,
- Type ctype)
+ public override TypeSpec Mutate (TypeParameterMutator mutator)
{
- if (TypeManager.HasGenericArguments (ctype)) {
- Type[] types = TypeManager.GetTypeArguments (ctype);
+ var targs = TypeArguments;
+ if (targs != null)
+ targs = mutator.Mutate (targs);
- TypeArguments new_args = new TypeArguments ();
+ var decl = DeclaringType;
+ if (IsNested && DeclaringType.IsGenericOrParentIsGeneric)
+ decl = mutator.Mutate (decl);
- for (int i = 0; i < types.Length; i++) {
- Type t = types [i];
+ if (targs == TypeArguments && decl == DeclaringType)
+ return this;
- if (t.IsGenericParameter) {
- int pos = t.GenericParameterPosition;
- t = atypes [pos];
- }
- new_args.Add (new TypeExpression (t, loc));
- }
+ 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;
- TypeExpr ct = new GenericTypeExpr (ctype, new_args, loc);
- if (ct.ResolveAsTypeStep (ec, false) == null)
- return false;
- ctype = ct.Type;
- } else if (ctype.IsGenericParameter) {
- int pos = ctype.GenericParameterPosition;
- if (ctype.DeclaringMethod == null) {
- // FIXME: Implement
- return true;
- } else {
- ctype = atypes [pos];
- }
+ mutated.declaringType = decl;
+ mutated.state |= StateFlags.PendingMetaInflate;
}
- if (Convert.ImplicitStandardConversionExists (expr, ctype))
- return true;
-
- Report_SymbolRelatedToPreviousError ();
- Report.SymbolRelatedToPreviousError (expr.Type);
-
- if (TypeManager.IsNullableType (expr.Type) && ctype.IsInterface) {
- Report.Error (313, loc,
- "The type `{0}' cannot be used as type parameter `{1}' in the generic type or method `{2}'. " +
- "The nullable type `{0}' never satisfies interface constraint of type `{3}'",
- TypeManager.CSharpName (expr.Type), TypeManager.CSharpName (ptype),
- GetSignatureForError (), TypeManager.CSharpName (ctype));
- } else {
- Report.Error (309, loc,
- "The type `{0}' must be convertible to `{1}' in order to " +
- "use it as parameter `{2}' in the generic type or method `{3}'",
- TypeManager.CSharpName (expr.Type), TypeManager.CSharpName (ctype),
- TypeManager.CSharpName (ptype), GetSignatureForError ());
+ if (targs != null) {
+ mutated.targs = targs;
+ mutated.info = null;
}
- return false;
+
+ return mutated;
}
+ }
- static bool HasDefaultConstructor (Type atype)
+
+ //
+ // Tracks the type arguments when instantiating a generic type. It's used
+ // by both type arguments and type parameters
+ //
+ public class TypeArguments
+ {
+ List<FullNamedExpression> args;
+ TypeSpec[] atypes;
+
+ public TypeArguments (params FullNamedExpression[] types)
{
- 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;
+ this.args = new List<FullNamedExpression> (types);
+ }
- again:
- atype = TypeManager.DropGenericTypeArguments (atype);
- if (atype is TypeBuilder) {
- TypeContainer tc = TypeManager.LookupTypeContainer (atype);
- if (tc.InstanceConstructors == null) {
- atype = atype.BaseType;
- goto again;
- }
+ public void Add (FullNamedExpression type)
+ {
+ args.Add (type);
+ }
- 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;
+ // TODO: Kill this monster
+ public TypeParameterName[] GetDeclarations ()
+ {
+ return args.ConvertAll (i => (TypeParameterName) i).ToArray ();
+ }
- return true;
- }
+ /// <summary>
+ /// We may only be used after Resolve() is called and return the fully
+ /// resolved types.
+ /// </summary>
+ // TODO: Not needed, just return type from resolve
+ public TypeSpec[] Arguments {
+ get {
+ return atypes;
}
+ }
- MemberInfo [] list = TypeManager.MemberLookup (null, null, atype, MemberTypes.Constructor,
- BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
- ConstructorInfo.ConstructorName, null);
+ public int Count {
+ get {
+ return args.Count;
+ }
+ }
- if (list == null)
+ public virtual bool IsEmpty {
+ get {
return false;
+ }
+ }
- foreach (MethodBase mb in list) {
- AParametersCollection pd = TypeManager.GetParameterData (mb);
- if (pd.Count == 0)
- return true;
+ public string 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 (',');
}
- return false;
+ return sb.ToString ();
}
- protected abstract string GetSignatureForError ();
- protected abstract void Report_SymbolRelatedToPreviousError ();
-
- public static bool CheckConstraints (EmitContext ec, MethodBase definition,
- MethodBase instantiated, Location loc)
+ /// <summary>
+ /// Resolve the type arguments.
+ /// </summary>
+ public virtual bool Resolve (IMemberContext ec)
{
- MethodConstraintChecker checker = new MethodConstraintChecker (
- definition, definition.GetGenericArguments (),
- instantiated.GetGenericArguments (), loc);
+ if (atypes != null)
+ return atypes.Length != 0;
+
+ int count = args.Count;
+ bool ok = true;
+
+ atypes = new TypeSpec [count];
+
+ for (int i = 0; i < count; i++){
+ TypeExpr te = args[i].ResolveAsTypeTerminal (ec, false);
+ if (te == null) {
+ ok = false;
+ continue;
+ }
+
+ atypes[i] = te.Type;
+
+ 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 (te.Type.IsPointer || TypeManager.IsSpecialType (te.Type)) {
+ ec.Compiler.Report.Error (306, te.Location,
+ "The type `{0}' may not be used as a type argument",
+ te.GetSignatureForError ());
+ ok = false;
+ }
+ }
+
+ if (!ok)
+ atypes = TypeSpec.EmptyTypes;
- return checker.CheckConstraints (ec);
+ return ok;
}
- public static bool CheckConstraints (IResolveContext ec, Type gt, Type[] gen_params,
- Type[] atypes, Location loc)
+ public TypeArguments Clone ()
{
- TypeConstraintChecker checker = new TypeConstraintChecker (
- gt, gen_params, atypes, loc);
+ TypeArguments copy = new TypeArguments ();
+ foreach (var ta in args)
+ copy.args.Add (ta);
- return checker.CheckConstraints (ec);
+ return copy;
}
+ }
- protected class MethodConstraintChecker : ConstraintChecker
+ public class UnboundTypeArguments : TypeArguments
+ {
+ public UnboundTypeArguments (int arity)
+ : base (new FullNamedExpression[arity])
{
- MethodBase definition;
-
- public MethodConstraintChecker (MethodBase definition, Type[] gen_params,
- Type[] atypes, Location loc)
- : base (gen_params, atypes, loc)
- {
- this.definition = definition;
- }
+ }
- protected override string GetSignatureForError ()
- {
- return TypeManager.CSharpSignature (definition);
+ public override bool IsEmpty {
+ get {
+ return true;
}
+ }
- protected override void Report_SymbolRelatedToPreviousError ()
- {
- Report.SymbolRelatedToPreviousError (definition);
- }
+ public override bool Resolve (IMemberContext ec)
+ {
+ // should not be called
+ throw new NotSupportedException ();
}
+ }
- protected class TypeConstraintChecker : ConstraintChecker
+ public class TypeParameterName : SimpleName
+ {
+ Attributes attributes;
+ Variance variance;
+
+ public TypeParameterName (string name, Attributes attrs, Location loc)
+ : this (name, attrs, Variance.None, loc)
{
- Type gt;
+ }
- public TypeConstraintChecker (Type gt, Type[] gen_params, Type[] atypes,
- Location loc)
- : base (gen_params, atypes, loc)
- {
- this.gt = gt;
- }
+ public TypeParameterName (string name, Attributes attrs, Variance variance, Location loc)
+ : base (name, loc)
+ {
+ attributes = attrs;
+ this.variance = variance;
+ }
- protected override string GetSignatureForError ()
- {
- return TypeManager.CSharpName (gt);
+ public Attributes OptAttributes {
+ get {
+ return attributes;
}
+ }
- protected override void Report_SymbolRelatedToPreviousError ()
- {
- Report.SymbolRelatedToPreviousError (gt);
+ public Variance Variance {
+ get {
+ return variance;
}
}
}
- /// <summary>
- /// A generic method definition.
- /// </summary>
- public class GenericMethod : DeclSpace
+ //
+ // A type expression of generic type with type arguments
+ //
+ class GenericTypeExpr : TypeExpr
{
- FullNamedExpression return_type;
- Parameters parameters;
+ TypeArguments args;
+ TypeSpec open_type;
+ bool constraints_checked;
- public GenericMethod (NamespaceEntry ns, DeclSpace parent, MemberName name,
- FullNamedExpression return_type, Parameters parameters)
- : base (ns, parent, name, null)
+ /// <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 (TypeSpec open_type, TypeArguments args, Location l)
{
- this.return_type = return_type;
- this.parameters = parameters;
+ this.open_type = open_type;
+ loc = l;
+ this.args = args;
}
- public override TypeBuilder DefineType ()
- {
- throw new Exception ();
+ public TypeArguments TypeArguments {
+ get { return args; }
}
- public override bool Define ()
+ public override string GetSignatureForError ()
{
- for (int i = 0; i < TypeParameters.Length; i++)
- if (!TypeParameters [i].Resolve (this))
- return false;
-
- return true;
+ return TypeManager.CSharpName (type);
}
- /// <summary>
- /// Define and resolve the type parameters.
- /// We're called from Method.Define().
- /// </summary>
- public bool Define (MethodOrOperator m)
+ protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
{
- TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
- string[] snames = new string [names.Length];
- for (int i = 0; i < names.Length; i++) {
- string type_argument_name = names[i].Name;
- int idx = parameters.GetParameterIndexByName (type_argument_name);
- if (idx >= 0) {
- Block b = m.Block;
- if (b == null)
- b = new Block (null);
-
- b.Error_AlreadyDeclaredTypeParameter (parameters [i].Location,
- type_argument_name, "method parameter");
- }
-
- snames[i] = type_argument_name;
- }
+ if (!args.Resolve (ec))
+ return null;
- GenericTypeParameterBuilder[] gen_params = m.MethodBuilder.DefineGenericParameters (snames);
- for (int i = 0; i < TypeParameters.Length; i++)
- TypeParameters [i].Define (gen_params [i]);
+ TypeSpec[] atypes = args.Arguments;
- if (!Define ())
- return false;
+ //
+ // Now bind the parameters
+ //
+ type = open_type.MakeGenericType (atypes);
- for (int i = 0; i < TypeParameters.Length; i++) {
- if (!TypeParameters [i].ResolveType (this))
- return false;
- }
+ //
+ // Check constraints when context is not method/base type
+ //
+ if (!ec.HasUnresolvedConstraints)
+ CheckConstraints (ec);
- return true;
+ return this;
}
- /// <summary>
- /// We're called from MethodData.Define() after creating the MethodBuilder.
- /// </summary>
- public bool DefineType (EmitContext ec, MethodBuilder mb,
- MethodInfo implementing, bool is_override)
+ //
+ // Checks the constraints of open generic type against type
+ // arguments. Has to be called onafter all members are defined
+ //
+ public bool CheckConstraints (IMemberContext ec)
{
- for (int i = 0; i < TypeParameters.Length; i++)
- if (!TypeParameters [i].DefineType (
- ec, mb, implementing, is_override))
- return false;
+ if (constraints_checked)
+ return true;
- bool ok = parameters.Resolve (ec);
+ constraints_checked = true;
- if ((return_type != null) && (return_type.ResolveAsTypeTerminal (ec, false) == null))
- ok = false;
+ var gtype = (InflatedTypeSpec) type;
+ var constraints = gtype.Constraints;
+ if (constraints == null)
+ return true;
- return ok;
+ return ConstraintChecker.CheckAll (open_type, args.Arguments, constraints, loc, ec.Compiler.Report);
}
-
- public void EmitAttributes ()
+
+ public override bool CheckAccessLevel (IMemberContext mc)
{
- for (int i = 0; i < TypeParameters.Length; i++)
- TypeParameters [i].Emit ();
+ DeclSpace c = mc.CurrentMemberDefinition as DeclSpace;
+ if (c == null)
+ c = mc.CurrentMemberDefinition.Parent;
- if (OptAttributes != null)
- OptAttributes.Emit ();
+ return c.CheckAccessLevel (open_type);
}
- public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
- MemberFilter filter, object criteria)
+ public bool HasDynamicArguments ()
{
- throw new Exception ();
- }
-
- public override MemberCache MemberCache {
- get {
- return null;
- }
+ return HasDynamicArguments (args.Arguments);
}
- public override AttributeTargets AttributeTargets {
- get {
- return AttributeTargets.Method | AttributeTargets.ReturnValue;
+ static bool HasDynamicArguments (TypeSpec[] args)
+ {
+ foreach (var item in args) {
+ if (item == InternalType.Dynamic)
+ return true;
+
+ if (TypeManager.IsGenericType (item))
+ return HasDynamicArguments (TypeManager.GetTypeArguments (item));
}
- }
- public override string DocCommentHeader {
- get { return "M:"; }
+ return false;
}
- public new void VerifyClsCompliance ()
+ public override bool Equals (object obj)
{
- foreach (TypeParameter tp in TypeParameters) {
- if (tp.Constraints == null)
- continue;
+ GenericTypeExpr cobj = obj as GenericTypeExpr;
+ if (cobj == null)
+ return false;
- tp.Constraints.VerifyClsCompliance ();
- }
+ if ((type == null) || (cobj.type == null))
+ return false;
+
+ return type == cobj.type;
}
- }
- public partial class TypeManager
- {
- static public Type activator_type;
-
- public static TypeContainer LookupGenericTypeContainer (Type t)
+ public override int GetHashCode ()
{
- t = DropGenericTypeArguments (t);
- return LookupTypeContainer (t);
+ return base.GetHashCode ();
}
+ }
+ static class ConstraintChecker
+ {
/// <summary>
- /// Check whether `a' and `b' may become equal generic types.
- /// The algorithm to do that is a little bit complicated.
+ /// Check the constraints; we're called from ResolveAsTypeTerminal()
+ /// after fully resolving the constructed type.
/// </summary>
- public static bool MayBecomeEqualGenericTypes (Type a, Type b, Type[] class_inferred,
- Type[] method_inferred)
+ public static bool CheckAll (MemberSpec context, TypeSpec[] targs, TypeParameterSpec[] tparams, Location loc, Report report)
{
- if (a.IsGenericParameter) {
- //
- // If a is an array of a's type, they may never
- // become equal.
- //
- while (b.IsArray) {
- b = b.GetElementType ();
- if (a.Equals (b))
- return false;
- }
-
- //
- // If b is a generic parameter or an actual type,
- // they may become equal:
- //
- // class X<T,U> : I<T>, I<U>
- // class X<T> : I<T>, I<float>
- //
- if (b.IsGenericParameter || !b.IsGenericType) {
- int pos = a.GenericParameterPosition;
- Type[] args = a.DeclaringMethod != null ? method_inferred : class_inferred;
- if (args [pos] == null) {
- args [pos] = b;
- return true;
- }
-
- return args [pos] == a;
- }
-
- //
- // We're now comparing a type parameter with a
- // generic instance. They may become equal unless
- // the type parameter appears anywhere in the
- // generic instance:
- //
- // class X<T,U> : I<T>, I<X<U>>
- // -> error because you could instanciate it as
- // X<X<int>,int>
- //
- // class X<T> : I<T>, I<X<T>> -> ok
- //
-
- Type[] bargs = GetTypeArguments (b);
- for (int i = 0; i < bargs.Length; i++) {
- if (a.Equals (bargs [i]))
- return false;
- }
-
- return true;
+ for (int i = 0; i < tparams.Length; i++) {
+ if (!CheckConstraint (context, targs [i], tparams [i], loc, report))
+ return false;
}
- if (b.IsGenericParameter)
- return MayBecomeEqualGenericTypes (b, a, class_inferred, method_inferred);
+ return true;
+ }
+ static bool CheckConstraint (MemberSpec context, TypeSpec atype, TypeParameterSpec tparam, Location loc, Report report)
+ {
//
- // 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).
+ // First, check the `class' and `struct' constraints.
//
+ if (tparam.HasSpecialClass && !TypeManager.IsReferenceType (atype)) {
+ 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;
+ }
- if (a.IsGenericType || b.IsGenericType)
- return MayBecomeEqualGenericInstances (a, b, class_inferred, method_inferred);
+ if (tparam.HasSpecialStruct && (!TypeManager.IsValueType (atype) || TypeManager.IsNullableType (atype))) {
+ 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;
+ }
//
- // If both of them are arrays.
+ // The class constraint comes next.
//
-
- if (a.IsArray && b.IsArray) {
- if (a.GetArrayRank () != b.GetArrayRank ())
- return false;
-
- a = a.GetElementType ();
- b = b.GetElementType ();
-
- return MayBecomeEqualGenericTypes (a, b, class_inferred, method_inferred);
+ if (tparam.HasTypeConstraint) {
+ CheckConversion (context, atype, tparam, tparam.BaseType, loc, report);
}
//
- // Ok, two ordinary types.
+ // Now, check the interfaces and type parameters constraints
//
+ if (tparam.Interfaces != null) {
+ if (TypeManager.IsNullableType (atype)) {
+ 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 ());
+ } else {
+ foreach (TypeSpec iface in tparam.Interfaces) {
+ CheckConversion (context, atype, tparam, iface, loc, report);
+ }
+ }
+ }
- return a.Equals (b);
- }
+ //
+ // Finally, check the constructor constraint.
+ //
+ if (!tparam.HasSpecialConstructor)
+ return true;
- //
- // 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 ())
+ if (!HasDefaultConstructor (atype)) {
+ 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), tparam.GetSignatureForError (), context.GetSignatureForError ());
return false;
+ }
- return MayBecomeEqualGenericInstances (
- GetTypeArguments (a), GetTypeArguments (b), class_inferred, method_inferred);
+ return true;
}
- public static bool MayBecomeEqualGenericInstances (Type[] aargs, Type[] bargs,
- Type[] class_inferred,
- Type[] method_inferred)
+ static void CheckConversion (MemberSpec context, TypeSpec atype, TypeParameterSpec tparam, TypeSpec ttype, Location loc, Report report)
{
- 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;
+ var expr = new EmptyExpression (atype);
+ if (!Convert.ImplicitStandardConversionExists (expr, ttype)) {
+ report.SymbolRelatedToPreviousError (tparam);
+ if (TypeManager.IsValueType (atype)) {
+ 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) {
+ 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 {
+ 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 true;
}
- /// <summary>
- /// Type inference. Try to infer the type arguments from `method',
- /// which is invoked with the arguments `arguments'. This is used
- /// when resolving an Invocation or a DelegateInvocation and the user
- /// did not explicitly specify type arguments.
- /// </summary>
- public static int InferTypeArguments (EmitContext ec,
- ArrayList arguments,
- ref MethodBase method)
+ static bool HasDefaultConstructor (TypeSpec atype)
{
- ATypeInference ti = ATypeInference.CreateInstance (arguments);
- Type[] i_args = ti.InferMethodArguments (ec, method);
- if (i_args == null)
- return ti.InferenceScore;
+ var tp = atype as TypeParameterSpec;
+ if (tp != null) {
+ return tp.HasSpecialConstructor || tp.HasSpecialStruct;
+ }
- if (i_args.Length == 0)
- return 0;
+ if (atype.IsStruct || atype.IsEnum)
+ return true;
- method = ((MethodInfo) method).MakeGenericMethod (i_args);
- return 0;
- }
+ if (atype.IsAbstract)
+ return false;
+
+ 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;
+ }
- /// <summary>
- /// Type inference.
- /// </summary>
- public static bool InferTypeArguments (AParametersCollection apd,
- ref MethodBase method)
- {
- if (!TypeManager.IsGenericMethod (method))
- return true;
+ foreach (var c in tc.InstanceConstructors) {
+ if (c.ParameterInfo.IsEmpty) {
+ if ((c.ModFlags & Modifiers.PUBLIC) != 0)
+ return true;
+ }
+ }
- ATypeInference ti = ATypeInference.CreateInstance (ArrayList.Adapter (apd.Types));
- Type[] i_args = ti.InferDelegateArguments (method);
- if (i_args == null)
return false;
+ }
- method = ((MethodInfo) method).MakeGenericMethod (i_args);
- return true;
+ var found = MemberCache.FindMember (tdef,
+ MemberFilter.Constructor (ParametersCompiled.EmptyReadOnlyParameters),
+ BindingRestriction.DeclaredOnly | BindingRestriction.InstanceOnly);
+
+ return found != null && (found.Modifiers & Modifiers.PUBLIC) != 0;
}
}
- abstract class ATypeInference
+ /// <summary>
+ /// A generic method definition.
+ /// </summary>
+ public class GenericMethod : DeclSpace
{
- protected readonly ArrayList arguments;
- protected readonly int arg_count;
+ ParametersCompiled parameters;
- protected ATypeInference (ArrayList arguments)
+ public GenericMethod (NamespaceEntry ns, DeclSpace parent, MemberName name,
+ FullNamedExpression return_type, ParametersCompiled parameters)
+ : base (ns, parent, name, null)
{
- this.arguments = arguments;
- if (arguments != null)
- arg_count = arguments.Count;
+ this.parameters = parameters;
}
- public static ATypeInference CreateInstance (ArrayList arguments)
+ public GenericMethod (NamespaceEntry ns, DeclSpace parent, MemberName name, TypeParameter[] tparams,
+ FullNamedExpression return_type, ParametersCompiled parameters)
+ : this (ns, parent, name, return_type, parameters)
{
- if (RootContext.Version == LanguageVersion.ISO_2)
- return new TypeInferenceV2 (arguments);
-
- return new TypeInferenceV3 (arguments);
+ this.type_params = tparams;
}
- public virtual int InferenceScore {
+ public override TypeParameter[] CurrentTypeParameters {
get {
- return int.MaxValue;
+ return base.type_params;
}
}
- public abstract Type[] InferMethodArguments (EmitContext ec, MethodBase method);
- public abstract Type[] InferDelegateArguments (MethodBase method);
- }
-
- //
- // Implements C# 2.0 type inference
- //
- class TypeInferenceV2 : ATypeInference
- {
- public TypeInferenceV2 (ArrayList arguments)
- : base (arguments)
+ public override TypeBuilder DefineType ()
{
+ throw new Exception ();
}
- public override Type[] InferDelegateArguments (MethodBase method)
+ public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
{
- AParametersCollection pd = TypeManager.GetParameterData (method);
- if (arg_count != pd.Count)
- return null;
-
- Type[] method_args = method.GetGenericArguments ();
- Type[] inferred_types = new Type[method_args.Length];
-
- Type[] param_types = new Type[pd.Count];
- Type[] arg_types = (Type[])arguments.ToArray (typeof (Type));
-
- for (int i = 0; i < arg_count; i++) {
- param_types[i] = pd.Types [i];
- }
-
- if (!InferTypeArguments (param_types, arg_types, inferred_types))
- return null;
-
- return inferred_types;
+ throw new NotSupportedException ();
}
- public override Type[] InferMethodArguments (EmitContext ec, MethodBase method)
+ public override bool Define ()
{
- AParametersCollection pd = TypeManager.GetParameterData (method);
- Type[] method_generic_args = method.GetGenericArguments ();
- Type [] inferred_types = new Type [method_generic_args.Length];
- Type[] arg_types = new Type [pd.Count];
-
- int a_count = arg_types.Length;
- if (pd.HasParams)
- --a_count;
+ throw new NotSupportedException ();
+ }
- for (int i = 0; i < a_count; i++) {
- Argument a = (Argument) arguments[i];
- if (a.Expr is NullLiteral || a.Expr is MethodGroupExpr || a.Expr is AnonymousMethodExpression)
- continue;
+ /// <summary>
+ /// Define and resolve the type parameters.
+ /// We're called from Method.Define().
+ /// </summary>
+ public bool Define (MethodOrOperator m)
+ {
+ TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
+ string[] snames = new string [names.Length];
+ for (int i = 0; i < names.Length; i++) {
+ string type_argument_name = names[i].Name;
+ int idx = parameters.GetParameterIndexByName (type_argument_name);
- if (!TypeInferenceV2.UnifyType (pd.Types [i], a.Type, inferred_types))
- return null;
- }
+ if (idx >= 0) {
+ var b = m.Block;
+ if (b == null)
+ b = new ToplevelBlock (Compiler, Location);
- if (pd.HasParams) {
- Type element_type = TypeManager.GetElementType (pd.Types [a_count]);
- for (int i = a_count; i < arg_count; i++) {
- Argument a = (Argument) arguments [i];
- if (a.Expr is NullLiteral || a.Expr is MethodGroupExpr || a.Expr is AnonymousMethodExpression)
- continue;
+ b.Error_AlreadyDeclaredTypeParameter (parameters [i].Location,
+ type_argument_name, "method parameter");
+ }
- if (!TypeInferenceV2.UnifyType (element_type, a.Type, inferred_types))
- return null;
+ if (m.Block != null) {
+ var ikv = m.Block.GetKnownVariable (type_argument_name);
+ if (ikv != null)
+ ikv.Block.Error_AlreadyDeclaredTypeParameter (ikv.Location, type_argument_name, "local variable");
}
+
+ snames[i] = type_argument_name;
}
- for (int i = 0; i < inferred_types.Length; i++)
- if (inferred_types [i] == null)
- return null;
+ GenericTypeParameterBuilder[] gen_params = m.MethodBuilder.DefineGenericParameters (snames);
+ for (int i = 0; i < TypeParameters.Length; i++)
+ TypeParameters [i].Define (gen_params [i], null);
- return inferred_types;
+ return true;
}
- static bool InferTypeArguments (Type[] param_types, Type[] arg_types,
- Type[] inferred_types)
+ public void EmitAttributes ()
{
- for (int i = 0; i < arg_types.Length; i++) {
- if (arg_types[i] == null)
- continue;
-
- if (!UnifyType (param_types[i], arg_types[i], inferred_types))
- return false;
- }
-
- for (int i = 0; i < inferred_types.Length; ++i)
- if (inferred_types[i] == null)
- return false;
-
- return true;
+ if (OptAttributes != null)
+ OptAttributes.Emit ();
}
- public static bool UnifyType (Type pt, Type at, Type[] inferred)
+ public override string GetSignatureForError ()
{
- if (pt.IsGenericParameter) {
- if (pt.DeclaringMethod == null)
- return pt == at;
-
- int pos = pt.GenericParameterPosition;
-
- if (inferred [pos] == null)
- inferred [pos] = at;
+ return base.GetSignatureForError () + parameters.GetSignatureForError ();
+ }
- return inferred [pos] == at;
+ public override AttributeTargets AttributeTargets {
+ get {
+ return AttributeTargets.Method | AttributeTargets.ReturnValue;
}
+ }
- if (!pt.ContainsGenericParameters) {
- if (at.ContainsGenericParameters)
- return UnifyType (at, pt, inferred);
- else
- return true;
- }
+ public override string DocCommentHeader {
+ get { return "M:"; }
+ }
- if (at.IsArray) {
- if (pt.IsArray) {
- if (at.GetArrayRank () != pt.GetArrayRank ())
- return false;
+ public new void VerifyClsCompliance ()
+ {
+ foreach (TypeParameter tp in TypeParameters) {
+ tp.VerifyClsCompliance ();
+ }
+ }
+ }
- return UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
+ public partial class TypeManager
+ {
+ public static Variance CheckTypeVariance (TypeSpec t, Variance expected, IMemberContext member)
+ {
+ 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) {
+ ((TypeParameter)tp.MemberDefinition).ErrorInvalidVariance (member, expected);
}
- if (!pt.IsGenericType)
- return false;
-
- Type gt = pt.GetGenericTypeDefinition ();
- if ((gt != TypeManager.generic_ilist_type) && (gt != TypeManager.generic_icollection_type) &&
- (gt != TypeManager.generic_ienumerable_type))
- return false;
-
- Type[] args = TypeManager.GetTypeArguments (pt);
- return UnifyType (args[0], at.GetElementType (), inferred);
+ return expected;
}
- if (pt.IsArray) {
- if (!at.IsArray ||
- (pt.GetArrayRank () != at.GetArrayRank ()))
- return false;
+ 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 UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
+ return expected;
}
- if (pt.IsByRef && at.IsByRef)
- return UnifyType (pt.GetElementType (), at.GetElementType (), inferred);
- ArrayList list = new ArrayList ();
- if (at.IsGenericType)
- list.Add (at);
- for (Type bt = at.BaseType; bt != null; bt = bt.BaseType)
- list.Add (bt);
+ if (t.IsArray)
+ return CheckTypeVariance (GetElementType (t), expected, member);
- list.AddRange (TypeManager.GetInterfaces (at));
+ return Variance.None;
+ }
- foreach (Type type in list) {
- if (!type.IsGenericType)
- continue;
+ /// <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);
+ TypeSpec[] i_args = ti.InferMethodArguments (ec, method);
+ if (i_args == null)
+ return ti.InferenceScore;
- if (TypeManager.DropGenericTypeArguments (pt) != TypeManager.DropGenericTypeArguments (type))
- continue;
+ if (i_args.Length == 0)
+ return 0;
- if (!UnifyTypes (pt.GetGenericArguments (), type.GetGenericArguments (), inferred))
- return false;
- }
+ method = method.MakeGenericMethod (i_args);
+ return 0;
+ }
+ }
- 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;
}
- static bool UnifyTypes (Type[] pts, Type[] ats, Type[] inferred)
+ public static ATypeInference CreateInstance (Arguments arguments)
{
- for (int i = 0; i < ats.Length; i++) {
- if (!UnifyType (pts [i], ats [i], inferred))
- return false;
+ return new TypeInference (arguments);
+ }
+
+ public virtual int InferenceScore {
+ get {
+ return int.MaxValue;
}
- return true;
}
+
+ public abstract TypeSpec[] InferMethodArguments (ResolveContext ec, MethodSpec method);
}
//
- // Implements C# 3.0 type inference
+ // Implements C# type inference
//
- class TypeInferenceV3 : ATypeInference
+ class TypeInference : ATypeInference
{
//
// Tracks successful rate of type inference
//
int score = int.MaxValue;
- public TypeInferenceV3 (ArrayList arguments)
+ public TypeInference (Arguments arguments)
: base (arguments)
{
}
}
}
- public override Type[] InferDelegateArguments (MethodBase method)
- {
- AParametersCollection pd = TypeManager.GetParameterData (method);
- if (arg_count != pd.Count)
- return null;
-
- Type[] d_gargs = method.GetGenericArguments ();
- TypeInferenceContext context = new TypeInferenceContext (d_gargs);
-
- // A lower-bound inference is made from each argument type Uj of D
- // to the corresponding parameter type Tj of M
- for (int i = 0; i < arg_count; ++i) {
- Type t = pd.Types [i];
- if (!t.IsGenericParameter)
- continue;
-
- context.LowerBoundInference ((Type)arguments[i], t);
- }
-
- if (!context.FixAllTypes ())
- return null;
-
- return context.InferredTypeArguments;
- }
-
- public override Type[] InferMethodArguments (EmitContext ec, MethodBase method)
+ public override TypeSpec[] InferMethodArguments (ResolveContext ec, MethodSpec method)
{
- Type[] 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 = TypeManager.GetParameterData (method);
+ AParametersCollection pd = method.Parameters;
if (!InferInPhases (ec, context, pd))
return null;
//
// Implements method type arguments inference
//
- bool InferInPhases (EmitContext ec, TypeInferenceContext tic, AParametersCollection methodParameters)
+ bool InferInPhases (ResolveContext ec, TypeInferenceContext tic, AParametersCollection methodParameters)
{
int params_arguments_start;
if (methodParameters.HasParams) {
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 = (Argument) arguments [i];
+ Argument a = arguments [i];
+ if (a == null)
+ continue;
if (i < params_arguments_start) {
method_parameter = methodParameters.Types [i];
else
method_parameter = TypeManager.GetElementType (methodParameters.Types [params_arguments_start]);
- ptypes = (Type[]) ptypes.Clone ();
+ ptypes = (TypeSpec[]) ptypes.Clone ();
ptypes [i] = method_parameter;
}
//
AnonymousMethodExpression am = a.Expr as AnonymousMethodExpression;
if (am != null) {
- if (am.ExplicitTypeInference (tic, method_parameter))
+ if (am.ExplicitTypeInference (ec, tic, method_parameter))
--score;
continue;
}
- if (a.Expr is NullLiteral)
+ if (a.IsByRef) {
+ score -= tic.ExactInference (a.Type, method_parameter);
+ continue;
+ }
+
+ if (a.Expr.Type == InternalType.Null)
continue;
+ if (TypeManager.IsValueType (method_parameter)) {
+ score -= tic.LowerBoundInference (a.Type, method_parameter);
+ continue;
+ }
+
//
// Otherwise an output type inference is made
//
// we don't need to call it in cycle
//
bool fixed_any = false;
- if (!tic.FixIndependentTypeArguments (ptypes, ref fixed_any))
+ if (!tic.FixIndependentTypeArguments (ec, ptypes, ref fixed_any))
return false;
return DoSecondPhase (ec, tic, ptypes, !fixed_any);
}
- bool DoSecondPhase (EmitContext 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 (ref fixed_any))
+ if (fixDependent && !tic.FixDependentTypes (ec, ref fixed_any))
return false;
// If no further unfixed type variables exist, type inference succeeds
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];
}
- MethodInfo mi = Delegate.GetInvokeMethod (t_i, t_i);
- Type rtype = mi.ReturnType;
-
-#if MS_COMPATIBLE
- // Blablabla, because reflection does not work with dynamic types
- Type[] g_args = t_i.GetGenericArguments ();
- rtype = g_args[rtype.GenericParameterPosition];
-#endif
+ var mi = Delegate.GetInvokeMethod (ec.Compiler, t_i);
+ TypeSpec rtype = mi.ReturnType;
- if (tic.IsReturnTypeNonDependent (mi, rtype))
- score -= tic.OutputTypeInference (ec, ((Argument) arguments [i]).Expr, t_i);
+ if (tic.IsReturnTypeNonDependent (ec, mi, rtype))
+ score -= tic.OutputTypeInference (ec, arguments [i].Expr, t_i);
}
public class TypeInferenceContext
{
- readonly Type[] unfixed_types;
- readonly Type[] fixed_types;
- readonly ArrayList[] bounds;
+ enum BoundKind
+ {
+ Exact = 0,
+ Lower = 1,
+ Upper = 2
+ }
+
+ class BoundInfo
+ {
+ public readonly TypeSpec Type;
+ public readonly BoundKind Kind;
+
+ public BoundInfo (TypeSpec type, BoundKind kind)
+ {
+ this.Type = type;
+ this.Kind = kind;
+ }
+
+ public override int GetHashCode ()
+ {
+ return Type.GetHashCode ();
+ }
+
+ public override bool Equals (object obj)
+ {
+ BoundInfo a = (BoundInfo) obj;
+ return Type == a.Type && Kind == a.Kind;
+ }
+ }
+
+ 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 ArrayList [typeArguments.Length];
- unfixed_types = new Type [typeArguments.Length];
+ bounds = new List<BoundInfo> [typeArguments.Length];
+ unfixed_types = new TypeSpec [typeArguments.Length];
}
unfixed_types [i] = typeArguments [i];
} else {
}
}
- public Type[] InferredTypeArguments {
+ //
+ // Used together with AddCommonTypeBound fo implement
+ // 7.4.2.13 Finding the best common type of a set of expressions
+ //
+ public TypeInferenceContext ()
+ {
+ 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 TypeSpec[] InferredTypeArguments {
get {
return fixed_types;
}
}
- void AddToBounds (Type t, int index)
+ public void AddCommonTypeBound (TypeSpec type)
+ {
+ AddToBounds (new BoundInfo (type, BoundKind.Lower), 0);
+ }
+
+ void AddToBounds (BoundInfo bound, int index)
{
//
// Some types cannot be used as type arguments
//
- if (t == TypeManager.void_type || t.IsPointer)
+ if (bound.Type == TypeManager.void_type || bound.Type.IsPointer)
return;
- ArrayList a = bounds [index];
+ var a = bounds [index];
if (a == null) {
- a = new ArrayList ();
+ a = new List<BoundInfo> ();
bounds [index] = a;
} else {
- if (a.Contains (t))
+ if (a.Contains (bound))
return;
}
// // t = constraints.EffectiveBaseClass;
// }
//}
- a.Add (t);
+ 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;
if (pos == -1)
return 0;
- AddToBounds (u, pos);
+ AddToBounds (new BoundInfo (u, BoundKind.Exact), pos);
return 1;
}
- public bool FixAllTypes ()
+ public bool FixAllTypes (ResolveContext ec)
{
for (int i = 0; i < unfixed_types.Length; ++i) {
- if (!FixType (i))
+ if (!FixType (ec, i))
return false;
}
return true;
// a, There is at least one type variable Xj that depends on Xi
// b, Xi has a non-empty set of bounds
//
- public bool FixDependentTypes (ref bool fixed_any)
+ public bool FixDependentTypes (ResolveContext ec, ref bool fixed_any)
{
for (int i = 0; i < unfixed_types.Length; ++i) {
if (unfixed_types[i] == null)
if (bounds[i] == null)
continue;
- if (!FixType (i))
+ if (!FixType (ec, i))
return false;
fixed_any = true;
//
// All unfixed type variables Xi which depend on no Xj are fixed
//
- public bool FixIndependentTypeArguments (Type[] methodParameters, ref bool fixed_any)
+ public bool FixIndependentTypeArguments (ResolveContext ec, TypeSpec[] methodParameters, ref bool fixed_any)
{
- ArrayList types_to_fix = new ArrayList (unfixed_types);
+ var types_to_fix = new List<TypeSpec> (unfixed_types);
for (int i = 0; i < methodParameters.Length; ++i) {
- Type t = methodParameters[i];
- if (t.IsGenericParameter)
- continue;
+ 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];
}
- MethodInfo invoke = Delegate.GetInvokeMethod (t, t);
- Type rtype = invoke.ReturnType;
- if (!rtype.IsGenericParameter && !rtype.IsGenericType)
+ if (t.IsGenericParameter)
+ continue;
+
+ 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;
int idx = IsUnfixed (t);
- if (idx >= 0 && !FixType (idx)) {
+ if (idx >= 0 && !FixType (ec, idx)) {
return false;
}
}
//
// 26.3.3.10 Fixing
//
- public bool FixType (int i)
+ public bool FixType (ResolveContext ec, int i)
{
// It's already fixed
if (unfixed_types[i] == null)
if (failed)
return false;
- ArrayList candidates = (ArrayList)bounds [i];
+ var candidates = bounds [i];
if (candidates == null)
return false;
if (candidates.Count == 1) {
unfixed_types[i] = null;
- fixed_types[i] = (Type)candidates[0];
+ TypeSpec t = candidates[0].Type;
+ if (t == InternalType.Null)
+ return false;
+
+ fixed_types [i] = t;
return true;
}
// 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) {
- Type candidate = (Type)candidates [ci];
+ BoundInfo bound = candidates [ci];
for (cii = 0; cii < candidates_count; ++cii) {
if (cii == ci)
continue;
- if (!Convert.ImplicitConversionExists (null,
- new TypeExpression ((Type)candidates [cii], Location.Null), candidate)) {
+ BoundInfo cbound = candidates[cii];
+
+ // Same type parameters with different bounds
+ if (cbound.Type == bound.Type) {
+ if (bound.Kind != BoundKind.Exact)
+ bound = cbound;
+
+ continue;
+ }
+
+ if (bound.Kind == BoundKind.Exact || cbound.Kind == BoundKind.Exact) {
+ if (cbound.Kind != BoundKind.Exact) {
+ if (!Convert.ImplicitConversionExists (ec, new TypeExpression (cbound.Type, Location.Null), bound.Type)) {
+ break;
+ }
+
+ continue;
+ }
+
+ if (bound.Kind != BoundKind.Exact) {
+ if (!Convert.ImplicitConversionExists (ec, new TypeExpression (bound.Type, Location.Null), cbound.Type)) {
+ break;
+ }
+
+ bound = cbound;
+ continue;
+ }
+
break;
}
+
+ if (bound.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;
+ }
+ }
}
if (cii != candidates_count)
continue;
- if (best_candidate != null)
+ if (best_candidate != null && best_candidate != bound.Type)
return false;
- best_candidate = candidate;
+ best_candidate = bound.Type;
}
if (best_candidate == null)
}
//
- // 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 (MethodInfo 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 (returnType, returnType);
- return IsReturnTypeNonDependent (invoke, invoke.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))
}
// All generic input arguments have to be fixed
- AParametersCollection d_parameters = TypeManager.GetParameterData (invoke);
+ AParametersCollection d_parameters = invoke.Parameters;
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 (TypeSpec u, TypeSpec v, bool inversed)
{
// If V is one of the unfixed type arguments
int pos = IsUnfixed (v);
if (pos != -1) {
- AddToBounds (u, pos);
+ AddToBounds (new BoundInfo (u, inversed ? BoundKind.Upper : BoundKind.Lower), pos);
return 1;
}
// If U is an array type
- if (u.IsArray) {
- int u_dim = u.GetArrayRank ();
- Type v_e;
- Type u_e = TypeManager.GetElementType (u);
-
- if (v.IsArray) {
- if (u_dim != v.GetArrayRank ())
+ 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_e = TypeManager.GetElementType (v);
-
- if (u.IsByRef) {
- return LowerBoundInference (u_e, v_e);
- }
+ if (TypeManager.IsValueType (u_ac.Element))
+ return ExactInference (u_ac.Element, v_ac.Element);
- return ExactInference (u_e, v_e);
+ 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_e = TypeManager.GetTypeArguments (v)[0];
-
- if (u.IsByRef) {
- return LowerBoundInference (u_e, v_e);
- }
+ var v_i = TypeManager.GetTypeArguments (v) [0];
+ if (TypeManager.IsValueType (u_ac.Element))
+ return ExactInference (u_ac.Element, v_i);
- return ExactInference (u_e, v_e);
+ 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 set of types U1..Uk
- // such that a standard implicit conversion exists from U to C<U1..Uk> then an exact
- // inference is made from each Ui for the corresponding Vi
+ // 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>
//
- ArrayList u_candidates = new ArrayList ();
- 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 C<T>,
- // class U: C<int>, C<long> then no type inference is made when inferring
- // from U to C<T> because T could be int or long
+ // 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.Default.Equals (unique_candidate_targs, second_unique_candidate_targs)) {
unique_candidate_targs = second_unique_candidate_targs;
continue;
}
-
+
//
// This should always cause type inference failure
//
return 1;
}
- unique_candidate_targs = u_candidate.GetGenericArguments ();
+ unique_candidate_targs = TypeManager.GetTypeArguments (u_candidate);
}
if (unique_candidate_targs != null) {
+ var ga_open_v = open_v.TypeParameters;
int score = 0;
- for (int i = 0; i < unique_candidate_targs.Length; ++i)
- if (ExactInference (unique_candidate_targs [i], ga_v [i]) == 0)
- ++score;
+ for (int i = 0; i < unique_candidate_targs.Length; ++i) {
+ Variance variance = ga_open_v [i].Variance;
+
+ TypeSpec u_i = unique_candidate_targs [i];
+ if (variance == Variance.None || TypeManager.IsValueType (u_i)) {
+ if (ExactInference (u_i, ga_v [i]) == 0)
+ ++score;
+ } else {
+ bool upper_bound = (variance == Variance.Contravariant && !inversed) ||
+ (variance == Variance.Covariant && inversed);
+
+ if (LowerBoundInference (u_i, ga_v [i], upper_bound) == 0)
+ ++score;
+ }
+ }
return score;
}
}
//
// 26.3.3.6 Output Type Inference
//
- public int OutputTypeInference (EmitContext 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);
- MethodInfo invoke = Delegate.GetInvokeMethod (t, t);
+ TypeSpec rt = ame.InferReturnType (ec, this, t);
+ var invoke = Delegate.GetInvokeMethod (ec.Compiler, t);
if (rt == null) {
- AParametersCollection pd = TypeManager.GetParameterData (invoke);
+ 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];
+ }
- MethodInfo invoke = Delegate.GetInvokeMethod (t, t);
- Type rtype = invoke.ReturnType;
-#if MS_COMPATIBLE
- // Blablabla, because reflection does not work with dynamic types
- Type [] g_args = t.GetGenericArguments ();
- rtype = g_args [rtype.GenericParameterPosition];
-#endif
+ 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;
- ArrayList args = DelegateCreation.CreateDelegateMethodArguments (invoke, e.Location);
+ Arguments args = DelegateCreation.CreateDelegateMethodArguments (invoke.Parameters, param_types, e.Location);
mg = mg.OverloadResolve (ec, ref args, true, e.Location);
if (mg == null)
return 0;
- // TODO: What should happen when return type is of generic type ?
- throw new NotImplementedException ();
-// return LowerBoundInference (null, rtype) + 1;
+ return LowerBoundInference (mg.BestCandidate.ReturnType, rtype) + 1;
}
//
return LowerBoundInference (e.Type, t) * 2;
}
- void RemoveDependentTypes (ArrayList 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