namespace Mono.CSharp {
+ /// <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;
}
ValueType
}
- //
- // Tracks the constraints for a type parameter
- //
+ /// <summary>
+ /// Tracks the constraints for a type parameter from a generic type definition.
+ /// </summary>
public class Constraints : GenericConstraints {
string name;
ArrayList constraints;
this.loc = loc;
}
- public string TypeParameter {
+ public override string TypeParameter {
get {
return name;
}
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 (EmitContext ec)
{
if (resolved)
if (errors != Report.Errors)
return false;
- Report.Error (246, loc, "Cannot find type '{0}'", obj);
+ Report.Error (246, loc, "Cannot find type '{0}'", ((Expression) obj).GetSignatureForError ());
return false;
}
} else
expr = fn.ResolveAsTypeTerminal (ec);
- if (expr == null)
+ if ((expr == null) || (expr.Type == null))
return false;
TypeParameterExpr texpr = expr as TypeParameterExpr;
num_constraints++;
}
+ ArrayList list = new ArrayList ();
+ foreach (TypeExpr iface_constraint in iface_constraints) {
+ foreach (Type type in list) {
+ if (!type.Equals (iface_constraint.Type))
+ continue;
+
+ Report.Error (405, loc,
+ "Duplicate constraint `{0}' for type " +
+ "parameter `{1}'.", iface_constraint.GetSignatureForError (),
+ name);
+ return false;
+ }
+
+ list.Add (iface_constraint.Type);
+ }
+
+ foreach (TypeParameterExpr expr in type_param_constraints) {
+ foreach (Type type in list) {
+ if (!type.Equals (expr.Type))
+ continue;
+
+ Report.Error (405, loc,
+ "Duplicate constraint `{0}' for type " +
+ "parameter `{1}'.", expr.GetSignatureForError (), name);
+ return false;
+ }
+
+ list.Add (expr.Type);
+ }
+
+ iface_constraint_types = new Type [list.Count];
+ list.CopyTo (iface_constraint_types, 0);
+
+ if (class_constraint != null) {
+ class_constraint_type = class_constraint.Type;
+ if (class_constraint_type == null)
+ return false;
+
+ if (class_constraint_type.IsSealed) {
+ Report.Error (701, loc,
+ "`{0}' is not a valid bound. Bounds " +
+ "must be interfaces or non sealed " +
+ "classes", TypeManager.CSharpName (class_constraint_type));
+ return false;
+ }
+
+ if ((class_constraint_type == TypeManager.array_type) ||
+ (class_constraint_type == TypeManager.delegate_type) ||
+ (class_constraint_type == TypeManager.enum_type) ||
+ (class_constraint_type == TypeManager.value_type) ||
+ (class_constraint_type == TypeManager.object_type)) {
+ Report.Error (702, loc,
+ "Bound cannot be special class `{0}'",
+ TypeManager.CSharpName (class_constraint_type));
+ return false;
+ }
+ }
+
+ if (class_constraint_type != null)
+ effective_base_type = class_constraint_type;
+ else if (HasValueTypeConstraint)
+ effective_base_type = TypeManager.value_type;
+ else
+ effective_base_type = TypeManager.object_type;
+
resolved = true;
return true;
}
return true;
}
+ /// <summary>
+ /// Resolve the constraints into actual types.
+ /// </summary>
public bool ResolveTypes (EmitContext ec)
{
- if (effective_base_type != null)
+ if (resolved_types)
return true;
+ resolved_types = true;
+
foreach (object obj in constraints) {
ConstructedType cexpr = obj as ConstructedType;
if (cexpr == null)
return false;
}
- ArrayList list = new ArrayList ();
-
foreach (TypeExpr iface_constraint in iface_constraints) {
- foreach (Type type in list) {
- if (!type.Equals (iface_constraint.Type))
- continue;
-
- Report.Error (405, loc,
- "Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", iface_constraint.Type,
- name);
+ if (iface_constraint.ResolveType (ec) == null)
return false;
- }
-
- TypeExpr te = iface_constraint.ResolveAsTypeTerminal (ec);
- if (te == null)
- return false;
-
- list.Add (te.Type);
}
- foreach (TypeParameterExpr expr in type_param_constraints) {
- foreach (Type type in list) {
- if (!type.Equals (expr.Type))
- continue;
-
- Report.Error (405, loc,
- "Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", expr.Type, name);
- return false;
- }
-
- list.Add (expr.Type);
- }
-
- ArrayList new_list = new ArrayList ();
- foreach (Type iface in list) {
- if (new_list.Contains (iface))
- continue;
-
- new_list.Add (iface);
-
- Type [] implementing = TypeManager.GetInterfaces (iface);
-
- foreach (Type imp in implementing) {
- if (!new_list.Contains (imp))
- new_list.Add (imp);
- }
- }
-
- iface_constraint_types = new Type [new_list.Count];
- new_list.CopyTo (iface_constraint_types, 0);
-
if (class_constraint != null) {
- TypeExpr te = class_constraint.ResolveAsTypeTerminal (ec);
- if (te == null)
- return false;
-
- class_constraint_type = te.Type;
- if (class_constraint_type == null)
- return false;
-
- if (class_constraint_type.IsSealed) {
- Report.Error (701, loc,
- "`{0}' is not a valid bound. Bounds " +
- "must be interfaces or non sealed " +
- "classes", class_constraint_type);
- return false;
- }
-
- if ((class_constraint_type == TypeManager.array_type) ||
- (class_constraint_type == TypeManager.delegate_type) ||
- (class_constraint_type == TypeManager.enum_type) ||
- (class_constraint_type == TypeManager.value_type) ||
- (class_constraint_type == TypeManager.object_type)) {
- Report.Error (702, loc,
- "Bound cannot be special class `{0}'",
- class_constraint_type);
+ if (class_constraint.ResolveType (ec) == null)
return false;
- }
}
- if (class_constraint_type != null)
- effective_base_type = class_constraint_type;
- else if (HasValueTypeConstraint)
- effective_base_type = TypeManager.value_type;
- else
- effective_base_type = TypeManager.object_type;
-
return true;
}
+ /// <summary>
+ /// Check whether there are no conflicts in our type parameter constraints.
+ ///
+ /// This is an example:
+ ///
+ /// class Foo<T,U>
+ /// where T : class
+ /// where U : T, struct
+ /// </summary>
public bool CheckDependencies (EmitContext ec)
{
foreach (TypeParameterExpr expr in type_param_constraints) {
if (HasValueTypeConstraint && constraints.HasClassConstraint) {
Report.Error (455, loc, "Type parameter `{0}' inherits " +
"conflicting constraints `{1}' and `{2}'",
- name, constraints.ClassConstraint,
+ name, TypeManager.CSharpName (constraints.ClassConstraint),
"System.ValueType");
return false;
}
Report.Error (455, loc,
"Type parameter `{0}' inherits " +
"conflicting constraints `{1}' and `{2}'",
- name, t1, t2);
+ name, TypeManager.CSharpName (t1), TypeManager.CSharpName (t2));
return false;
}
}
return true;
}
- public void Define (GenericTypeParameterBuilder type)
- {
- type.SetGenericParameterAttributes (attrs);
- }
-
public override GenericParameterAttributes Attributes {
get { return attrs; }
}
get { return effective_base_type; }
}
- internal bool IsSubclassOf (Type t)
+ public bool IsSubclassOf (Type t)
{
if ((class_constraint_type != null) &&
class_constraint_type.IsSubclassOf (t))
return false;
}
+ /// <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 CheckInterfaceMethod (EmitContext ec, GenericConstraints gc)
{
if (gc.Attributes != attrs)
}
}
- //
- // This type represents a generic type parameter
- //
+ /// <summary>
+ /// A type parameter from a generic type definition.
+ /// </summary>
public class TypeParameter : MemberCore, IMemberContainer {
string name;
+ DeclSpace decl;
GenericConstraints gc;
Constraints constraints;
Location loc;
GenericTypeParameterBuilder type;
- public TypeParameter (TypeContainer parent, string name,
- Constraints constraints, Location loc)
- : base (parent, new MemberName (name, loc), null)
+ public TypeParameter (TypeContainer parent, DeclSpace decl, string name,
+ Constraints constraints, Attributes attrs, Location loc)
+ : base (parent, new MemberName (name, loc), attrs)
{
this.name = name;
+ this.decl = decl;
this.constraints = constraints;
this.loc = loc;
}
}
}
- public Type Type {
+ public DeclSpace DeclSpace {
get {
- return type;
+ return decl;
}
}
- public bool Resolve (DeclSpace ds)
- {
- if (constraints != null) {
- if (!constraints.Resolve (ds.EmitContext)) {
- constraints = null;
- return false;
- }
+ public Type Type {
+ get {
+ return type;
}
-
- return true;
}
+ /// <summary>
+ /// This is the first method which is called during the resolving
+ /// process; we're called immediately after creating the type parameters
+ /// with SRE (by calling `DefineGenericParameters()' on the TypeBuilder /
+ /// MethodBuilder).
+ ///
+ /// We're either called from TypeContainer.DefineType() or from
+ /// GenericMethod.Define() (called from Method.Define()).
+ /// </summary>
public void Define (GenericTypeParameterBuilder type)
{
if (this.type != null)
TypeManager.AddTypeParameter (type, this);
}
- public void DefineConstraints ()
+ /// <summary>
+ /// This is the second method which is called during the resolving
+ /// process - in case of class type parameters, we're called from
+ /// TypeContainer.ResolveType() - after it resolved the class'es
+ /// base class and interfaces. For method type parameters, we're
+ /// called immediately after Define().
+ ///
+ /// We're just resolving the constraints into expressions here, we
+ /// don't resolve them into actual types.
+ ///
+ /// Note that in the special case of partial generic classes, we may be
+ /// called _before_ Define() and we may also be called multiple types.
+ /// </summary>
+ public bool Resolve (DeclSpace ds)
{
- if (constraints != null)
- constraints.Define (type);
+ if (constraints != null) {
+ if (!constraints.Resolve (ds.EmitContext)) {
+ constraints = null;
+ return false;
+ }
+ }
+
+ 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 (EmitContext ec)
{
if (constraints != null) {
return true;
}
+ /// <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 (EmitContext ec)
{
return DefineType (ec, null, null, 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 (EmitContext ec, MethodBuilder builder,
MethodInfo implementing, bool is_override)
{
mb = mb.GetGenericMethodDefinition ();
int pos = type.GenericParameterPosition;
- ParameterData pd = TypeManager.GetParameterData (mb);
- GenericConstraints temp_gc = pd.GenericConstraints (pos);
Type mparam = mb.GetGenericArguments () [pos];
+ GenericConstraints temp_gc = ReflectionConstraints.GetConstraints (mparam);
if (temp_gc != null)
gc = new InflatedConstraints (temp_gc, implementing.DeclaringType);
425, loc, "The constraints for type " +
"parameter `{0}' of method `{1}' must match " +
"the constraints for type parameter `{2}' " +
- "of interface method `{3}'. Consider using " +
+ "of interface method `{3}'. Consider using " +
"an explicit interface implementation instead",
Name, TypeManager.CSharpSignature (builder),
- mparam, TypeManager.CSharpSignature (mb));
+ TypeManager.CSharpName (mparam), TypeManager.CSharpSignature (mb));
return false;
}
+ } else if (DeclSpace is Iterator) {
+ 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;
}
type.SetBaseTypeConstraint (gc.ClassConstraint);
type.SetInterfaceConstraints (gc.InterfaceConstraints);
+ type.SetGenericParameterAttributes (gc.Attributes);
TypeManager.RegisterBuilder (type, gc.InterfaceConstraints);
return true;
}
+ /// <summary>
+ /// Check whether there are no conflicts in our type parameter constraints.
+ ///
+ /// This is an example:
+ ///
+ /// class Foo<T,U>
+ /// where T : class
+ /// where U : T, struct
+ /// </summary>
public bool CheckDependencies (EmitContext ec)
{
if (constraints != null)
return true;
}
+ /// <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 (EmitContext ec, Constraints new_constraints)
{
- //
- // We're used in partial generic type definitions.
- // If `check' is false, we just encountered the first ClassPart which has
- // constraints - they become our "real" constraints.
- // Otherwise we're called after the type parameters have already been defined
- // and check whether the constraints are the same in all parts.
- //
if (type == null)
throw new InvalidOperationException ();
return constraints.CheckInterfaceMethod (ec, new_constraints);
}
+ public void EmitAttributes (EmitContext ec)
+ {
+ if (OptAttributes != null)
+ OptAttributes.Emit (ec, this);
+ }
+
public override string DocCommentHeader {
get {
throw new InvalidOperationException (
return true;
}
- protected override void VerifyObsoleteAttribute ()
- { }
-
public override void ApplyAttributeBuilder (Attribute a,
CustomAttributeBuilder cb)
- { }
+ {
+ type.SetCustomAttribute (cb);
+ }
public override AttributeTargets AttributeTargets {
get {
- return (AttributeTargets) 0;
+ return (AttributeTargets) AttributeTargets.GenericParameter;
}
}
public override string[] ValidAttributeTargets {
get {
- return new string [0];
+ return new string [] { "type parameter" };
}
}
members.AddRange (list);
}
- foreach (Type t in gc.InterfaceConstraints) {
+ Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
+ foreach (Type t in ifaces) {
MemberList list = TypeManager.FindMembers (
t, mt, bf, filter, criteria);
return "TypeParameter[" + name + "]";
}
+ public static string GetSignatureForError (TypeParameter[] tp)
+ {
+ if (tp == null || tp.Length == 0)
+ return "";
+
+ StringBuilder sb = new StringBuilder ("<");
+ for (int i = 0; i < tp.Length; ++i) {
+ if (i > 0)
+ sb.Append (",");
+ sb.Append (tp[i].GetSignatureForError ());
+ }
+ sb.Append ('>');
+ return sb.ToString ();
+ }
+
protected class InflatedConstraints : GenericConstraints
{
GenericConstraints gc;
Type[] dargs;
public InflatedConstraints (GenericConstraints gc, Type declaring)
+ : this (gc, TypeManager.GetTypeArguments (declaring))
+ { }
+
+ public InflatedConstraints (GenericConstraints gc, Type[] dargs)
{
this.gc = gc;
-
- dargs = TypeManager.GetTypeArguments (declaring);
+ this.dargs = dargs;
ArrayList list = new ArrayList ();
if (gc.HasClassConstraint)
return t;
}
+ public override string TypeParameter {
+ get { return gc.TypeParameter; }
+ }
+
public override GenericParameterAttributes Attributes {
get { return gc.Attributes; }
}
}
}
- //
- // This type represents a generic type parameter reference.
- //
- // These expressions are born in a fully resolved state.
- //
+ /// <summary>
+ /// A TypeExpr which already resolved to a type parameter.
+ /// </summary>
public class TypeParameterExpr : TypeExpr {
TypeParameter type_parameter;
}
}
+ /// <summary>
+ /// Tracks the type arguments when instantiating a generic type. We're used in
+ /// ConstructedType.
+ /// </summary>
public class TypeArguments {
public readonly Location Location;
ArrayList args;
args.AddRange (new_args.args);
}
- public string[] GetDeclarations ()
+ /// <summary>
+ /// We're used during the parsing process: the parser can't distinguish
+ /// between type parameters and type arguments. Because of that, the
+ /// parser creates a `MemberName' with `TypeArguments' for both cases and
+ /// in case of a generic type definition, we call GetDeclarations().
+ /// </summary>
+ public TypeParameterName[] GetDeclarations ()
{
- string[] ret = new string [args.Count];
+ TypeParameterName[] ret = new TypeParameterName [args.Count];
for (int i = 0; i < args.Count; i++) {
+ TypeParameterName name = args [i] as TypeParameterName;
+ if (name != null) {
+ ret [i] = name;
+ continue;
+ }
SimpleName sn = args [i] as SimpleName;
if (sn != null) {
- ret [i] = sn.Name;
+ ret [i] = new TypeParameterName (sn.Name, null, sn.Location);
continue;
}
return ret;
}
+ /// <summary>
+ /// We may only be used after Resolve() is called and return the fully
+ /// resolved types.
+ /// </summary>
public Type[] Arguments {
get {
return atypes;
return s.ToString ();
}
+ /// <summary>
+ /// Resolve the type arguments.
+ /// </summary>
public bool Resolve (EmitContext ec)
{
int count = args.Count;
Report.Error (306, Location, "The type `{0}' may not be used " +
"as a type argument.", TypeManager.CSharpName (te.Type));
return false;
+ } else if (te.Type == TypeManager.void_type) {
+ Report.Error (1547, Location,
+ "Keyword `void' cannot be used in this context");
+ return false;
}
atypes [i] = te.Type;
return ok;
}
}
-
+
+ public class TypeParameterName : SimpleName
+ {
+ Attributes attributes;
+
+ public TypeParameterName (string name, Attributes attrs, Location loc)
+ : base (name, loc)
+ {
+ attributes = attrs;
+ }
+
+ public Attributes OptAttributes {
+ get {
+ return attributes;
+ }
+ }
+ }
+
+ /// <summary>
+ /// An instantiation of a generic type.
+ /// </summary>
public class ConstructedType : TypeExpr {
string full_name;
FullNamedExpression name;
TypeArguments args;
Type[] gen_params, atypes;
Type gt;
-
+
+ /// <summary>
+ /// Instantiate the generic type `fname' with the type arguments `args'.
+ /// </summary>
public ConstructedType (FullNamedExpression fname, TypeArguments args, Location l)
{
loc = l;
eclass = ExprClass.Type;
}
- public ConstructedType (Type t, TypeParameter[] type_params, Location l)
- : this (type_params, l)
- {
- gt = t.GetGenericTypeDefinition ();
-
- this.name = new TypeExpression (gt, l);
- full_name = gt.FullName + "<" + args.ToString () + ">";
+ /// <summary>
+ /// This is used to construct the `this' type inside a generic type definition.
+ /// </summary>
+ public ConstructedType (Type t, TypeParameter[] type_params, Location l)
+ : this (type_params, l)
+ {
+ gt = t.GetGenericTypeDefinition ();
+
+ this.name = new TypeExpression (gt, l);
+ full_name = gt.FullName + "<" + args.ToString () + ">";
+ }
+
+ /// <summary>
+ /// Instantiate the generic type `t' with the type arguments `args'.
+ /// Use this constructor if you already know the fully resolved
+ /// generic type.
+ /// </summary>
+ public ConstructedType (Type t, TypeArguments args, Location l)
+ : this (args, l)
+ {
+ gt = t.GetGenericTypeDefinition ();
+
+ this.name = new TypeExpression (gt, l);
+ full_name = gt.FullName + "<" + args.ToString () + ">";
+ }
+
+ public TypeArguments TypeArguments {
+ get { return args; }
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpName (gt);
+ }
+
+ protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
+ {
+ if (!ResolveConstructedType (ec))
+ return null;
+
+ return this;
+ }
+
+ /// <summary>
+ /// Check the constraints; we're called from ResolveAsTypeTerminal()
+ /// after fully resolving the constructed type.
+ /// </summary>
+ public bool CheckConstraints (EmitContext ec)
+ {
+ return ConstraintChecker.CheckConstraints (ec, gt, gen_params, atypes, loc);
+ }
+
+ /// <summary>
+ /// Resolve the constructed type, but don't check the constraints.
+ /// </summary>
+ public bool ResolveConstructedType (EmitContext ec)
+ {
+ if (type != null)
+ return true;
+ // If we already know the fully resolved generic type.
+ if (gt != null)
+ return DoResolveType (ec);
+
+ int num_args;
+ Type t = name.Type;
+
+ if (t == null) {
+ Report.Error (246, loc, "Cannot find type `{0}'<...>", Name);
+ return false;
+ }
+
+ num_args = TypeManager.GetNumberOfTypeArguments (t);
+ if (num_args == 0) {
+ Report.Error (308, loc,
+ "The non-generic type `{0}' cannot " +
+ "be used with type arguments.",
+ TypeManager.CSharpName (t));
+ return false;
+ }
+
+ gt = t.GetGenericTypeDefinition ();
+ return DoResolveType (ec);
+ }
+
+ bool DoResolveType (EmitContext ec)
+ {
+ //
+ // Resolve the arguments.
+ //
+ if (args.Resolve (ec) == false)
+ return false;
+
+ gen_params = gt.GetGenericArguments ();
+ atypes = args.Arguments;
+
+ if (atypes.Length != gen_params.Length) {
+ Report.Error (305, loc,
+ "Using the generic type `{0}' " +
+ "requires {1} type arguments",
+ TypeManager.CSharpName (gt),
+ gen_params.Length.ToString ());
+ return false;
+ }
+
+ //
+ // Now bind the parameters.
+ //
+ type = gt.MakeGenericType (atypes);
+ return true;
+ }
+
+ public Expression GetSimpleName (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override bool CheckAccessLevel (DeclSpace ds)
+ {
+ return ds.CheckAccessLevel (gt);
+ }
+
+ public override bool AsAccessible (DeclSpace ds, int flags)
+ {
+ return ds.AsAccessible (gt, flags);
+ }
+
+ public override bool IsClass {
+ get { return gt.IsClass; }
+ }
+
+ public override bool IsValueType {
+ get { return gt.IsValueType; }
+ }
+
+ public override bool IsInterface {
+ get { return gt.IsInterface; }
+ }
+
+ public override bool IsSealed {
+ get { return gt.IsSealed; }
}
- public ConstructedType (Type t, TypeArguments args, Location l)
- : this (args, l)
+ public override bool Equals (object obj)
{
- gt = t.GetGenericTypeDefinition ();
+ ConstructedType cobj = obj as ConstructedType;
+ if (cobj == null)
+ return false;
- this.name = new TypeExpression (gt, l);
- full_name = gt.FullName + "<" + args.ToString () + ">";
+ if ((type == null) || (cobj.type == null))
+ return false;
+
+ return type == cobj.type;
}
- public TypeArguments TypeArguments {
- get { return args; }
+ public override int GetHashCode ()
+ {
+ return base.GetHashCode ();
}
- protected string DeclarationName {
+ public override string Name {
get {
- StringBuilder sb = new StringBuilder ();
- sb.Append (gt.FullName);
- sb.Append ("<");
- for (int i = 0; i < gen_params.Length; i++) {
- if (i > 0)
- sb.Append (",");
- sb.Append (gen_params [i]);
- }
- sb.Append (">");
- return sb.ToString ();
+ return full_name;
}
}
- protected bool CheckConstraint (EmitContext ec, Type ptype, Expression expr,
- Type ctype)
- {
- if (TypeManager.HasGenericArguments (ctype)) {
- Type[] types = TypeManager.GetTypeArguments (ctype);
- TypeArguments new_args = new TypeArguments (loc);
+ public override string FullName {
+ get {
+ return full_name;
+ }
+ }
+ }
- for (int i = 0; i < types.Length; i++) {
- Type t = types [i];
+ public abstract class ConstraintChecker
+ {
+ protected readonly Type[] gen_params;
+ protected readonly Type[] atypes;
+ protected readonly Location loc;
- if (t.IsGenericParameter) {
- int pos = t.GenericParameterPosition;
- t = args.Arguments [pos];
- }
- new_args.Add (new TypeExpression (t, loc));
- }
+ protected ConstraintChecker (Type[] gen_params, Type[] atypes, Location loc)
+ {
+ this.gen_params = gen_params;
+ this.atypes = atypes;
+ this.loc = loc;
+ }
- TypeExpr ct = new ConstructedType (ctype, new_args, loc);
- if (ct.ResolveAsTypeStep (ec) == null)
+ /// <summary>
+ /// Check the constraints; we're called from ResolveAsTypeTerminal()
+ /// after fully resolving the constructed type.
+ /// </summary>
+ public bool CheckConstraints (EmitContext ec)
+ {
+ for (int i = 0; i < gen_params.Length; i++) {
+ if (!CheckConstraints (ec, i))
return false;
- ctype = ct.Type;
}
- return Convert.ImplicitStandardConversionExists (ec, expr, ctype);
+ return true;
}
protected bool CheckConstraints (EmitContext ec, int index)
"a reference type in order to use it " +
"as type parameter `{1}' in the " +
"generic type or method `{2}'.",
- atype, ptype, DeclarationName);
+ 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 value type in order to use it " +
"as type parameter `{1}' in the " +
"generic type or method `{2}'.",
- atype, ptype, DeclarationName);
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
return false;
}
//
if (gc.HasClassConstraint) {
if (!CheckConstraint (ec, ptype, aexpr, gc.ClassConstraint)) {
- 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}'",
- atype, gc.ClassConstraint, ptype, DeclarationName);
+ Error_TypeMustBeConvertible (atype, gc.ClassConstraint, ptype);
return false;
}
}
itype = it;
if (!CheckConstraint (ec, ptype, aexpr, itype)) {
- 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}'",
- atype, itype, ptype, DeclarationName);
+ Error_TypeMustBeConvertible (atype, itype, ptype);
return false;
}
}
if (TypeManager.IsBuiltinType (atype) || atype.IsValueType)
return true;
- MethodGroupExpr mg = Expression.MemberLookup (
- ec, atype, ".ctor", MemberTypes.Constructor,
- BindingFlags.Public | BindingFlags.Instance |
- BindingFlags.DeclaredOnly, loc)
- as MethodGroupExpr;
-
- if (!atype.IsAbstract && (mg != null) && mg.IsInstance) {
- foreach (MethodBase mb in mg.Methods) {
- ParameterData pd = TypeManager.GetParameterData (mb);
- if (pd.Count == 0)
- return true;
- }
- }
+ if (HasDefaultConstructor (ec, atype))
+ return true;
+ Report_SymbolRelatedToPreviousError ();
+ Report.SymbolRelatedToPreviousError (atype);
Report.Error (310, loc, "The type `{0}' must have a public " +
"parameterless constructor in order to use it " +
"as parameter `{1}' in the generic type or " +
- "method `{2}'", atype, ptype, DeclarationName);
+ "method `{2}'",
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
return false;
}
- protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
+ protected bool CheckConstraint (EmitContext ec, Type ptype, Expression expr,
+ Type ctype)
{
- if (!ResolveConstructedType (ec))
- return null;
+ if (TypeManager.HasGenericArguments (ctype)) {
+ Type[] types = TypeManager.GetTypeArguments (ctype);
- return this;
- }
+ TypeArguments new_args = new TypeArguments (loc);
- public bool CheckConstraints (EmitContext ec)
- {
- for (int i = 0; i < gen_params.Length; i++) {
- if (!CheckConstraints (ec, i))
+ for (int i = 0; i < types.Length; i++) {
+ Type t = types [i];
+
+ if (t.IsGenericParameter) {
+ int pos = t.GenericParameterPosition;
+ t = atypes [pos];
+ }
+ new_args.Add (new TypeExpression (t, loc));
+ }
+
+ TypeExpr ct = new ConstructedType (ctype, new_args, loc);
+ if (ct.ResolveAsTypeStep (ec) == null)
return false;
+ ctype = ct.Type;
}
- return true;
+ return Convert.ImplicitStandardConversionExists (ec, expr, ctype);
}
- public bool ResolveConstructedType (EmitContext ec)
+ bool HasDefaultConstructor (EmitContext ec, Type atype)
{
- if (type != null)
- return true;
- if (gt != null)
- return DoResolveType (ec);
-
- int num_args;
- Type t = name.Type;
+ if (atype is TypeBuilder) {
+ if (atype.IsAbstract)
+ return false;
- if (t == null) {
- Report.Error (246, loc, "Cannot find type `{0}'<...>", Name);
- return false;
- }
+ TypeContainer tc = TypeManager.LookupTypeContainer (atype);
+ 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;
- num_args = TypeManager.GetNumberOfTypeArguments (t);
- if (num_args == 0) {
- Report.Error (308, loc,
- "The non-generic type `{0}' cannot " +
- "be used with type arguments.",
- TypeManager.CSharpName (t));
- return false;
+ return true;
+ }
}
- gt = t.GetGenericTypeDefinition ();
- return DoResolveType (ec);
- }
-
- bool DoResolveType (EmitContext ec)
- {
- //
- // Resolve the arguments.
- //
- if (args.Resolve (ec) == false)
- return false;
-
- gen_params = gt.GetGenericArguments ();
- atypes = args.Arguments;
+ MethodGroupExpr mg = Expression.MemberLookup (
+ ec, atype, ".ctor", MemberTypes.Constructor,
+ BindingFlags.Public | BindingFlags.Instance |
+ BindingFlags.DeclaredOnly, loc)
+ as MethodGroupExpr;
- if (atypes.Length != gen_params.Length) {
- Report.Error (305, loc,
- "Using the generic type `{0}' " +
- "requires {1} type arguments",
- TypeManager.GetFullName (gt),
- gen_params.Length);
- return false;
+ if (!atype.IsAbstract && (mg != null) && mg.IsInstance) {
+ foreach (MethodBase mb in mg.Methods) {
+ ParameterData pd = TypeManager.GetParameterData (mb);
+ if (pd.Count == 0)
+ return true;
+ }
}
- //
- // Now bind the parameters.
- //
- type = gt.MakeGenericType (atypes);
- return true;
+ return false;
}
- public Expression GetSimpleName (EmitContext ec)
- {
- return this;
- }
+ protected abstract string GetSignatureForError ();
+ protected abstract void Report_SymbolRelatedToPreviousError ();
- public override bool CheckAccessLevel (DeclSpace ds)
+ void Error_TypeMustBeConvertible (Type atype, Type gc, Type ptype)
{
- return ds.CheckAccessLevel (gt);
+ Report_SymbolRelatedToPreviousError ();
+ Report.SymbolRelatedToPreviousError (atype);
+ 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 (atype), TypeManager.CSharpName (gc),
+ TypeManager.CSharpName (ptype), GetSignatureForError ());
}
- public override bool AsAccessible (DeclSpace ds, int flags)
+ public static bool CheckConstraints (EmitContext ec, MethodBase definition,
+ MethodBase instantiated, Location loc)
{
- return ds.AsAccessible (gt, flags);
- }
-
- public override bool IsClass {
- get { return gt.IsClass; }
- }
+ MethodConstraintChecker checker = new MethodConstraintChecker (
+ definition, definition.GetGenericArguments (),
+ instantiated.GetGenericArguments (), loc);
- public override bool IsValueType {
- get { return gt.IsValueType; }
+ return checker.CheckConstraints (ec);
}
- public override bool IsInterface {
- get { return gt.IsInterface; }
- }
+ public static bool CheckConstraints (EmitContext ec, Type gt, Type[] gen_params,
+ Type[] atypes, Location loc)
+ {
+ TypeConstraintChecker checker = new TypeConstraintChecker (
+ gt, gen_params, atypes, loc);
- public override bool IsSealed {
- get { return gt.IsSealed; }
+ return checker.CheckConstraints (ec);
}
- public override bool Equals (object obj)
+ protected class MethodConstraintChecker : ConstraintChecker
{
- ConstructedType cobj = obj as ConstructedType;
- if (cobj == null)
- return false;
+ MethodBase definition;
- if ((type == null) || (cobj.type == null))
- return false;
+ public MethodConstraintChecker (MethodBase definition, Type[] gen_params,
+ Type[] atypes, Location loc)
+ : base (gen_params, atypes, loc)
+ {
+ this.definition = definition;
+ }
- return type == cobj.type;
+ protected override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpSignature (definition);
+ }
+
+ protected override void Report_SymbolRelatedToPreviousError ()
+ {
+ Report.SymbolRelatedToPreviousError (definition);
+ }
}
- public override int GetHashCode ()
+ protected class TypeConstraintChecker : ConstraintChecker
{
- return base.GetHashCode ();
- }
+ Type gt;
- public override string Name {
- get {
- return full_name;
+ public TypeConstraintChecker (Type gt, Type[] gen_params, Type[] atypes,
+ Location loc)
+ : base (gen_params, atypes, loc)
+ {
+ this.gt = gt;
}
- }
+ protected override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpName (gt);
+ }
- public override string FullName {
- get {
- return full_name;
+ protected override void Report_SymbolRelatedToPreviousError ()
+ {
+ Report.SymbolRelatedToPreviousError (gt);
}
}
}
+ /// <summary>
+ /// A generic method definition.
+ /// </summary>
public class GenericMethod : DeclSpace
{
- public GenericMethod (NamespaceEntry ns, TypeContainer parent, MemberName name)
+ Expression return_type;
+ Parameters parameters;
+
+ public GenericMethod (NamespaceEntry ns, TypeContainer parent, MemberName name,
+ Expression return_type, Parameters parameters)
: base (ns, parent, name, null)
- { }
+ {
+ this.return_type = return_type;
+ this.parameters = parameters;
+ }
public override TypeBuilder DefineType ()
{
return true;
}
+ /// <summary>
+ /// Define and resolve the type parameters.
+ /// We're called from Method.Define().
+ /// </summary>
public bool Define (MethodBuilder mb)
{
GenericTypeParameterBuilder[] gen_params;
- string[] names = MemberName.TypeArguments.GetDeclarations ();
- gen_params = mb.DefineGenericParameters (names);
+ TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
+ string[] snames = new string [names.Length];
+ for (int i = 0; i < names.Length; i++)
+ snames [i] = names [i].Name;
+ gen_params = mb.DefineGenericParameters (snames);
for (int i = 0; i < TypeParameters.Length; i++)
TypeParameters [i].Define (gen_params [i]);
return true;
}
+ /// <summary>
+ /// We're called from MethodData.Define() after creating the MethodBuilder.
+ /// </summary>
public bool DefineType (EmitContext ec, MethodBuilder mb,
MethodInfo implementing, bool is_override)
{
ec, mb, implementing, is_override))
return false;
- return true;
+ bool ok = true;
+ foreach (Parameter p in parameters.FixedParameters){
+ if (!p.Resolve (ec))
+ ok = false;
+ }
+ if ((return_type != null) && (return_type.ResolveAsTypeTerminal (ec) == null))
+ ok = false;
+
+ return ok;
+ }
+
+ public void EmitAttributes (EmitContext ec)
+ {
+ for (int i = 0; i < TypeParameters.Length; i++)
+ TypeParameters [i].EmitAttributes (ec);
+
+ if (OptAttributes != null)
+ OptAttributes.Emit (ec, this);
}
public override bool DefineMembers (TypeContainer parent)
public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
{
- // FIXME
- }
-
- protected override void VerifyObsoleteAttribute()
- {
- // FIXME
+ base.ApplyAttributeBuilder (a, cb);
}
public override AttributeTargets AttributeTargets {
//
// A list of core types that the compiler requires or uses
//
- static public Type new_constraint_attr_type;
static public Type activator_type;
static public Type generic_ienumerator_type;
static public Type generic_ienumerable_type;
static void InitGenericCoreTypes ()
{
activator_type = CoreLookupType ("System", "Activator");
- new_constraint_attr_type = CoreLookupType (
- "System.Runtime.CompilerServices", "NewConstraintAttribute");
generic_ienumerator_type = CoreLookupType (
"System.Collections.Generic", "IEnumerator", 1);
public static TypeContainer LookupGenericTypeContainer (Type t)
{
- while (t.IsGenericInstance)
- t = t.GetGenericTypeDefinition ();
-
+ t = DropGenericTypeArguments (t);
return LookupTypeContainer (t);
}
if (tparam != null)
return tparam.GenericConstraints;
- return new ReflectionConstraints (t);
+ return ReflectionConstraints.GetConstraints (t);
}
public static bool IsGeneric (Type t)
public static int GetNumberOfTypeArguments (Type t)
{
+ if (t.IsGenericParameter)
+ return 0;
DeclSpace tc = LookupDeclSpace (t);
if (tc != null)
return tc.IsGeneric ? tc.CountTypeParameters : 0;
return t.GetGenericArguments ();
}
+ public static Type DropGenericTypeArguments (Type t)
+ {
+ if (!t.IsGenericType)
+ return t;
+ // Micro-optimization: a generic typebuilder is always a generic type definition
+ if (t is TypeBuilder)
+ return t;
+ return t.GetGenericTypeDefinition ();
+ }
+
//
// Whether `array' is an array of T and `enumerator' is `IEnumerable<T>'.
// For instance "string[]" -> "IEnumerable<string>".
return false;
}
- public static bool MayBecomeEqualGenericTypes (Type a, Type b, Type[] class_infered, Type[] method_infered)
+ /// <summary>
+ /// Check whether `a' and `b' may become equal generic types.
+ /// The algorithm to do that is a little bit complicated.
+ /// </summary>
+ public static bool MayBecomeEqualGenericTypes (Type a, Type b, Type[] class_infered,
+ Type[] method_infered)
{
if (a.IsGenericParameter) {
//
// particular instantiation (26.3.1).
//
public static bool MayBecomeEqualGenericInstances (Type a, Type b,
- Type[] class_infered, Type[] method_infered)
+ Type[] class_infered,
+ Type[] method_infered)
{
if (!a.IsGenericInstance || !b.IsGenericInstance)
return false;
}
public static bool MayBecomeEqualGenericInstances (Type[] aargs, Type[] bargs,
- Type[] class_infered, Type[] method_infered)
+ Type[] class_infered,
+ Type[] method_infered)
{
if (aargs.Length != bargs.Length)
return false;
return true;
}
- public static bool IsEqualGenericInstance (Type type, Type parent)
+ /// <summary>
+ /// Check whether `type' and `parent' are both instantiations of the same
+ /// generic type. Note that we do not check the type parameters here.
+ /// </summary>
+ public static bool IsInstantiationOfSameGenericType (Type type, Type parent)
{
int tcount = GetNumberOfTypeArguments (type);
int pcount = GetNumberOfTypeArguments (parent);
- if (type.IsGenericInstance)
- type = type.GetGenericTypeDefinition ();
- if (parent.IsGenericInstance)
- parent = parent.GetGenericTypeDefinition ();
-
if (tcount != pcount)
return false;
+ type = DropGenericTypeArguments (type);
+ parent = DropGenericTypeArguments (parent);
+
return type.Equals (parent);
}
- static public bool IsGenericMethod (MethodBase mb)
+ /// <summary>
+ /// Whether `mb' is a generic method definition.
+ /// </summary>
+ public static bool IsGenericMethod (MethodBase mb)
{
if (mb.DeclaringType is TypeBuilder) {
IMethodData method = (IMethodData) builder_to_method [mb];
return true;
}
+ /// <summary>
+ /// Type inference. Try to infer the type arguments from the params method
+ /// `method', which is invoked with the arguments `arguments'. This is used
+ /// when resolving an Invocation or a DelegateInvocation and the user
+ /// did not explicitly specify type arguments.
+ /// </summary>
public static bool InferParamsTypeArguments (EmitContext ec, ArrayList arguments,
ref MethodBase method)
{
return true;
}
- public static bool InferTypeArguments (Type[] param_types, Type[] arg_types, Type[] infered_types)
+ static bool InferTypeArguments (Type[] param_types, Type[] arg_types,
+ Type[] infered_types)
{
if (infered_types == null)
return false;
return true;
}
+ /// <summary>
+ /// Type inference. Try to infer the type arguments from `method',
+ /// which is invoked with the arguments `arguments'. This is used
+ /// when resolving an Invocation or a DelegateInvocation and the user
+ /// did not explicitly specify type arguments.
+ /// </summary>
public static bool InferTypeArguments (EmitContext ec, ArrayList arguments,
ref MethodBase method)
{
return true;
}
+ /// <summary>
+ /// Type inference.
+ /// </summary>
public static bool InferTypeArguments (EmitContext ec, ParameterData apd,
ref MethodBase method)
{
public static bool IsNullableType (Type t)
{
- if (!t.IsGenericInstance)
- return false;
-
- Type gt = t.GetGenericTypeDefinition ();
- return gt == generic_nullable_type;
+ return generic_nullable_type == DropGenericTypeArguments (t);
}
}
Type = type;
UnderlyingType = TypeManager.GetTypeArguments (type) [0];
- PropertyInfo has_value_pi = type.GetProperty ("HasValue");
- PropertyInfo value_pi = type.GetProperty ("Value");
+ PropertyInfo has_value_pi = TypeManager.GetProperty (type, "HasValue");
+ PropertyInfo value_pi = TypeManager.GetProperty (type, "Value");
HasValue = has_value_pi.GetGetMethod (false);
Value = value_pi.GetGetMethod (false);
Label true_label = ig.DefineLabel ();
Label end_label = ig.DefineLabel ();
+ bool false_label_used = false;
+ bool true_label_used = false;
+
if (left_unwrap != null) {
left_unwrap.EmitCheck (ec);
if (right is NullLiteral) {
- if (Oper == Binary.Operator.Equality)
+ if (Oper == Binary.Operator.Equality) {
+ true_label_used = true;
ig.Emit (OpCodes.Brfalse, true_label);
- else
+ } else {
+ false_label_used = true;
ig.Emit (OpCodes.Brfalse, false_label);
+ }
} else if (right_unwrap != null) {
ig.Emit (OpCodes.Dup);
ig.Emit (OpCodes.Brtrue, left_not_null_label);
ig.MarkLabel (left_not_null_label);
ig.Emit (OpCodes.Pop);
} else {
- if (Oper == Binary.Operator.Equality)
+ if (Oper == Binary.Operator.Equality) {
+ false_label_used = true;
ig.Emit (OpCodes.Brfalse, false_label);
- else
+ } else {
+ true_label_used = true;
ig.Emit (OpCodes.Brfalse, true_label);
+ }
}
}
if (right_unwrap != null) {
right_unwrap.EmitCheck (ec);
if (left is NullLiteral) {
- if (Oper == Binary.Operator.Equality)
+ if (Oper == Binary.Operator.Equality) {
+ true_label_used = true;
ig.Emit (OpCodes.Brfalse, true_label);
- else
+ } else {
+ false_label_used = true;
ig.Emit (OpCodes.Brfalse, false_label);
+ }
} else {
- if (Oper == Binary.Operator.Equality)
+ if (Oper == Binary.Operator.Equality) {
+ false_label_used = true;
ig.Emit (OpCodes.Brfalse, false_label);
- else
+ } else {
+ true_label_used = true;
ig.Emit (OpCodes.Brfalse, true_label);
+ }
}
}
bool right_is_null = right is NullLiteral;
if (left_is_null || right_is_null) {
if (((Oper == Binary.Operator.Equality) && (left_is_null == right_is_null)) ||
- ((Oper == Binary.Operator.Inequality) && (left_is_null != right_is_null)))
+ ((Oper == Binary.Operator.Inequality) && (left_is_null != right_is_null))) {
+ true_label_used = true;
ig.Emit (OpCodes.Br, true_label);
- else
+ } else {
+ false_label_used = true;
ig.Emit (OpCodes.Br, false_label);
+ }
} else {
underlying.Emit (ec);
ig.Emit (OpCodes.Br, end_label);
}
ig.MarkLabel (false_label);
- ig.Emit (OpCodes.Ldc_I4_0);
- ig.Emit (OpCodes.Br, end_label);
+ if (false_label_used) {
+ ig.Emit (OpCodes.Ldc_I4_0);
+ if (true_label_used)
+ ig.Emit (OpCodes.Br, end_label);
+ }
ig.MarkLabel (true_label);
- ig.Emit (OpCodes.Ldc_I4_1);
+ if (true_label_used)
+ ig.Emit (OpCodes.Ldc_I4_1);
ig.MarkLabel (end_label);
}
projects / mono.git / blobdiff