//
// Author:
// Miguel de Icaza (miguel@ximian.com)
+// Marek Safar (marek.safar@seznam.cz)
//
// (C) 2001 Ximian, Inc.
//
using System;
using System.Collections;
+using System.Collections.Specialized;
+using System.Reflection;
namespace Mono.CSharp {
+ public class RootNamespace : Namespace {
+ static MethodInfo get_namespaces_method;
+
+ string alias_name;
+ Assembly referenced_assembly;
+
+ Hashtable all_namespaces;
+
+ static Hashtable root_namespaces;
+ public static GlobalRootNamespace Global;
+
+ static RootNamespace ()
+ {
+ get_namespaces_method = typeof (Assembly).GetMethod ("GetNamespaces", BindingFlags.Instance | BindingFlags.NonPublic);
+
+ Reset ();
+ }
+
+ public static void Reset ()
+ {
+ root_namespaces = new Hashtable ();
+ Global = new GlobalRootNamespace ();
+ root_namespaces ["global"] = Global;
+ }
+
+ protected RootNamespace (string alias_name, Assembly assembly)
+ : base (null, String.Empty)
+ {
+ this.alias_name = alias_name;
+ referenced_assembly = assembly;
+
+ all_namespaces = new Hashtable ();
+ all_namespaces.Add ("", this);
+
+ if (referenced_assembly != null)
+ ComputeNamespaces (this.referenced_assembly);
+ }
+
+ public static void DefineRootNamespace (string name, Assembly assembly)
+ {
+ if (name == "global") {
+ // FIXME: Add proper error number
+ Report.Error (-42, "Cannot define an external alias named `global'");
+ return;
+ }
+ RootNamespace retval = GetRootNamespace (name);
+ if (retval == null || retval.referenced_assembly != assembly)
+ root_namespaces [name] = new RootNamespace (name, assembly);
+ }
+
+ public static RootNamespace GetRootNamespace (string name)
+ {
+ return (RootNamespace) root_namespaces [name];
+ }
+
+ public virtual Type LookupTypeReflection (string name, Location loc)
+ {
+ return GetTypeInAssembly (referenced_assembly, name);
+ }
+
+ public void RegisterNamespace (Namespace child)
+ {
+ if (child != this)
+ all_namespaces.Add (child.Name, child);
+ }
+
+ public bool IsNamespace (string name)
+ {
+ return all_namespaces.Contains (name);
+ }
+
+ protected void EnsureNamespace (string dotted_name)
+ {
+ if (dotted_name != null && dotted_name.Length != 0 && ! IsNamespace (dotted_name))
+ GetNamespace (dotted_name, true);
+ }
+
+ protected void ComputeNamespaces (Assembly assembly)
+ {
+ if (get_namespaces_method != null) {
+ string [] namespaces = (string []) get_namespaces_method.Invoke (assembly, null);
+ foreach (string ns in namespaces)
+ EnsureNamespace (ns);
+ return;
+ }
+
+ foreach (Type t in assembly.GetExportedTypes ())
+ EnsureNamespace (t.Namespace);
+ }
+
+ protected static Type GetTypeInAssembly (Assembly assembly, string name)
+ {
+ Type t = assembly.GetType (name);
+ if (t == null)
+ return null;
+
+ if (t.IsPointer)
+ throw new InternalErrorException ("Use GetPointerType() to get a pointer");
+
+ TypeAttributes ta = t.Attributes & TypeAttributes.VisibilityMask;
+ if (ta == TypeAttributes.NestedPrivate)
+ return null;
+
+ if ((ta == TypeAttributes.NotPublic ||
+ ta == TypeAttributes.NestedAssembly ||
+ ta == TypeAttributes.NestedFamANDAssem) &&
+ !TypeManager.IsFriendAssembly (t.Assembly))
+ return null;
+
+ return t;
+ }
+
+ public override string ToString ()
+ {
+ return String.Format ("RootNamespace ({0}::)", alias_name);
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return alias_name + "::";
+ }
+ }
+
+ public class GlobalRootNamespace : RootNamespace {
+ Assembly [] assemblies;
+ Module [] modules;
+
+ public GlobalRootNamespace ()
+ : base ("global", null)
+ {
+ assemblies = new Assembly [0];
+ }
+
+ public Assembly [] Assemblies {
+ get { return assemblies; }
+ }
+
+ public Module [] Modules {
+ get { return modules; }
+ }
+
+ public void AddAssemblyReference (Assembly a)
+ {
+ foreach (Assembly assembly in assemblies) {
+ if (a == assembly)
+ return;
+ }
+
+ int top = assemblies.Length;
+ Assembly [] n = new Assembly [top + 1];
+ assemblies.CopyTo (n, 0);
+ n [top] = a;
+ assemblies = n;
+
+ ComputeNamespaces (a);
+ }
+
+ public void AddModuleReference (Module m)
+ {
+ int top = modules != null ? modules.Length : 0;
+ Module [] n = new Module [top + 1];
+ if (modules != null)
+ modules.CopyTo (n, 0);
+ n [top] = m;
+ modules = n;
+
+ if (m == CodeGen.Module.Builder)
+ return;
+
+ foreach (Type t in m.GetTypes ())
+ EnsureNamespace (t.Namespace);
+ }
+
+ public override void Error_NamespaceDoesNotExist(DeclSpace ds, Location loc, string name)
+ {
+ Report.Error (400, loc, "The type or namespace name `{0}' could not be found in the global namespace (are you missing an assembly reference?)",
+ name);
+ }
+
+ public override Type LookupTypeReflection (string name, Location loc)
+ {
+ Type found_type = null;
+
+ foreach (Assembly a in assemblies) {
+ Type t = GetTypeInAssembly (a, name);
+ if (t == null)
+ continue;
+
+ if (found_type == null) {
+ found_type = t;
+ continue;
+ }
+
+ Report.SymbolRelatedToPreviousError (found_type);
+ Report.SymbolRelatedToPreviousError (t);
+ Report.Error (433, loc, "The imported type `{0}' is defined multiple times", name);
+
+ return found_type;
+ }
+
+ if (modules != null) {
+ foreach (Module module in modules) {
+ Type t = module.GetType (name);
+ if (t == null)
+ continue;
+
+ if (found_type == null) {
+ found_type = t;
+ continue;
+ }
+
+ Report.SymbolRelatedToPreviousError (found_type);
+ if (loc.IsNull) {
+ DeclSpace ds = TypeManager.LookupDeclSpace (t);
+ Report.Warning (1685, 1, ds.Location, "The type `{0}' conflicts with the predefined type `{1}' and will be ignored",
+ ds.GetSignatureForError (), TypeManager.CSharpName (found_type));
+ return found_type;
+ }
+ Report.SymbolRelatedToPreviousError (t);
+ Report.Warning (436, 2, loc, "The type `{0}' conflicts with the imported type `{1}'. Ignoring the imported type definition",
+ TypeManager.CSharpName (t), TypeManager.CSharpName (found_type));
+ return t;
+ }
+ }
+
+ return found_type;
+ }
+ }
+
/// <summary>
/// Keeps track of the namespaces defined in the C# code.
+ ///
+ /// This is an Expression to allow it to be referenced in the
+ /// compiler parse/intermediate tree during name resolution.
/// </summary>
- public class Namespace {
- static ArrayList all_namespaces = new ArrayList ();
- static Hashtable namespaces_map = new Hashtable ();
+ public class Namespace : FullNamedExpression {
Namespace parent;
string fullname;
- ArrayList entries;
Hashtable namespaces;
- Hashtable defined_names;
+ IDictionary declspaces;
+ Hashtable cached_types;
+ RootNamespace root;
+
+ public readonly MemberName MemberName;
/// <summary>
/// Constructor Takes the current namespace and the
/// </summary>
public Namespace (Namespace parent, string name)
{
+ // Expression members.
+ this.eclass = ExprClass.Namespace;
+ this.Type = typeof (Namespace);
+ this.loc = Location.Null;
+
this.parent = parent;
+ if (parent != null)
+ this.root = parent.root;
+ else
+ this.root = this as RootNamespace;
+
+ if (this.root == null)
+ throw new InternalErrorException ("Root namespaces must be created using RootNamespace");
+
string pname = parent != null ? parent.Name : "";
if (pname == "")
else
fullname = parent.Name + "." + name;
- entries = new ArrayList ();
+ if (fullname == null)
+ throw new InternalErrorException ("Namespace has a null fullname");
+
+ if (parent != null && parent.MemberName != MemberName.Null)
+ MemberName = new MemberName (parent.MemberName, name);
+ else if (name.Length == 0)
+ MemberName = MemberName.Null;
+ else
+ MemberName = new MemberName (name);
+
namespaces = new Hashtable ();
- defined_names = new Hashtable ();
+ cached_types = new Hashtable ();
- all_namespaces.Add (this);
- if (namespaces_map.Contains (fullname))
- return;
- namespaces_map [fullname] = true;
+ root.RegisterNamespace (this);
}
- public static bool IsNamespace (string name)
+ public override Expression DoResolve (EmitContext ec)
{
- return namespaces_map [name] != null;
+ return this;
+ }
+
+ public virtual void Error_NamespaceDoesNotExist (DeclSpace ds, Location loc, string name)
+ {
+ if (name.IndexOf ('`') > 0) {
+ FullNamedExpression retval = Lookup (ds, SimpleName.RemoveGenericArity (name), loc);
+ if (retval != null) {
+ Error_TypeArgumentsCannotBeUsed (retval.Type, loc, "type");
+ return;
+ }
+ } else {
+ Type t = LookForAnyGenericType (name);
+ if (t != null) {
+ Error_InvalidNumberOfTypeArguments (t, loc);
+ return;
+ }
+ }
+
+ Report.Error (234, loc, "The type or namespace name `{0}' does not exist in the namespace `{1}'. Are you missing an assembly reference?",
+ name, FullName);
}
-
- public static Namespace Root = new Namespace (null, "");
+ public static void Error_InvalidNumberOfTypeArguments (Type t, Location loc)
+ {
+ Report.SymbolRelatedToPreviousError (t);
+ Report.Error (305, loc, "Using the generic type `{0}' requires `{1}' type argument(s)",
+ TypeManager.CSharpName(t), TypeManager.GetNumberOfTypeArguments(t).ToString());
+ }
+
+ public static void Error_TypeArgumentsCannotBeUsed(Type t, Location loc, string symbol)
+ {
+ Report.SymbolRelatedToPreviousError(t);
+ Report.Error(308, loc, "The non-generic {0} `{1}' cannot be used with the type argument(s)",
+ symbol, TypeManager.CSharpName(t));
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new InternalErrorException ("Expression tree referenced namespace " + fullname + " during Emit ()");
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return Name;
+ }
+
public Namespace GetNamespace (string name, bool create)
{
int pos = name.IndexOf ('.');
return ns;
}
- public static Namespace LookupNamespace (string name, bool create)
+ TypeExpr LookupType (string name, Location loc)
{
- return Root.GetNamespace (name, create);
+ if (cached_types.Contains (name))
+ return cached_types [name] as TypeExpr;
+
+ Type t = null;
+ if (declspaces != null) {
+ DeclSpace tdecl = declspaces [name] as DeclSpace;
+ if (tdecl != null) {
+ //
+ // Note that this is not:
+ //
+ // t = tdecl.DefineType ()
+ //
+ // This is to make it somewhat more useful when a DefineType
+ // fails due to problems in nested types (more useful in the sense
+ // of fewer misleading error messages)
+ //
+ tdecl.DefineType ();
+ t = tdecl.TypeBuilder;
+ }
+ }
+ string lookup = t != null ? t.FullName : (fullname.Length == 0 ? name : fullname + "." + name);
+ Type rt = root.LookupTypeReflection (lookup, loc);
+
+ // HACK: loc.IsNull when the type is core type
+ if (t == null || (rt != null && loc.IsNull))
+ t = rt;
+
+ TypeExpr te = t == null ? null : new TypeExpression (t, Location.Null);
+ cached_types [name] = te;
+ return te;
}
- public object Lookup (DeclSpace ds, string name)
+ ///
+ /// Used for better error reporting only
+ ///
+ public Type LookForAnyGenericType (string typeName)
{
- object o = Lookup (name);
+ if (declspaces == null)
+ return null;
- Type t;
- DeclSpace tdecl = o as DeclSpace;
- if (tdecl != null) {
- t = tdecl.DefineType ();
+ typeName = SimpleName.RemoveGenericArity (typeName);
- if ((ds == null) || ds.CheckAccessLevel (t))
- return t;
+ foreach (DictionaryEntry de in declspaces) {
+ string type_item = (string) de.Key;
+ int pos = type_item.LastIndexOf ('`');
+ if (pos == typeName.Length && String.Compare (typeName, 0, type_item, 0, pos) == 0)
+ return ((DeclSpace) de.Value).TypeBuilder;
}
-
- Namespace ns = GetNamespace (name, false);
- if (ns != null)
- return ns;
-
- t = TypeManager.LookupType (DeclSpace.MakeFQN (fullname, name));
- if ((t == null) || ((ds != null) && !ds.CheckAccessLevel (t)))
- return null;
-
- return t;
+ return null;
}
- public void AddNamespaceEntry (NamespaceEntry entry)
+ public FullNamedExpression Lookup (DeclSpace ds, string name, Location loc)
{
- entries.Add (entry);
- }
+ if (namespaces.Contains (name))
+ return (Namespace) namespaces [name];
- public void DefineName (string name, object o)
- {
- defined_names.Add (name, o);
- }
+ TypeExpr te = LookupType (name, loc);
+ if (te == null || !ds.CheckAccessLevel (te.Type))
+ return null;
- public object Lookup (string name)
- {
- return defined_names [name];
+ return te;
}
- static public ArrayList UserDefinedNamespaces {
- get {
- return all_namespaces;
- }
+ public void AddDeclSpace (string name, DeclSpace ds)
+ {
+ if (declspaces == null)
+ declspaces = new HybridDictionary ();
+ declspaces.Add (name, ds);
}
/// <summary>
/// The qualified name of the current namespace
/// </summary>
public string Name {
- get {
- return fullname;
- }
+ get { return fullname; }
+ }
+
+ public override string FullName {
+ get { return fullname; }
}
/// <summary>
/// the current namespace declaration
/// </summary>
public Namespace Parent {
- get {
- return parent;
- }
- }
-
- public static void DefineNamespaces (SymbolWriter symwriter)
- {
- foreach (Namespace ns in all_namespaces) {
- foreach (NamespaceEntry entry in ns.entries)
- entry.DefineNamespace (symwriter);
- }
- }
-
- /// <summary>
- /// Used to validate that all the using clauses are correct
- /// after we are finished parsing all the files.
- /// </summary>
- public static void VerifyUsing ()
- {
- foreach (Namespace ns in all_namespaces) {
- foreach (NamespaceEntry entry in ns.entries)
- entry.VerifyUsing ();
- }
+ get { return parent; }
}
public override string ToString ()
{
- if (this == Root)
- return "Namespace (<root>)";
- else
- return String.Format ("Namespace ({0})", Name);
+ return String.Format ("Namespace ({0})", Name);
}
}
- public class NamespaceEntry
- {
+ public class NamespaceEntry {
Namespace ns;
NamespaceEntry parent, implicit_parent;
SourceFile file;
Hashtable aliases;
ArrayList using_clauses;
public bool DeclarationFound = false;
+ bool UsingFound;
+
+ public readonly DeclSpace SlaveDeclSpace;
+
+ ListDictionary extern_aliases;
+
+ static ArrayList entries = new ArrayList ();
+
+ public static void Reset ()
+ {
+ entries = new ArrayList ();
+ }
//
// This class holds the location where a using definition is
// We use this to flag using clauses for namespaces that do not
// exist.
//
- public class UsingEntry {
- public readonly string Name;
- public readonly NamespaceEntry NamespaceEntry;
- public readonly Location Location;
+ public class UsingEntry : IResolveContext {
+ public readonly MemberName Name;
+ readonly Expression Expr;
+ readonly NamespaceEntry NamespaceEntry;
+ readonly Location Location;
- public UsingEntry (NamespaceEntry entry, string name, Location loc)
+ public UsingEntry (NamespaceEntry entry, MemberName name, Location loc)
{
Name = name;
+ Expr = name.GetTypeExpression ();
NamespaceEntry = entry;
Location = loc;
}
- Namespace resolved_ns;
+ internal Namespace resolved;
public Namespace Resolve ()
{
- if (resolved_ns != null)
- return resolved_ns;
+ if (resolved != null)
+ return resolved;
- Namespace curr_ns = NamespaceEntry.NS;
- while ((curr_ns != null) && (resolved_ns == null)) {
- resolved_ns = curr_ns.GetNamespace (Name, false);
+ FullNamedExpression fne = Expr.ResolveAsTypeStep (this, false);
+ if (fne == null) {
+ Error_NamespaceNotFound (Location, Name.ToString ());
+ return null;
+ }
- if (resolved_ns == null)
- curr_ns = curr_ns.Parent;
+ resolved = fne as Namespace;
+ if (resolved == null) {
+ Report.Error (138, Location,
+ "`{0}' is a type not a namespace. A using namespace directive can only be applied to namespaces", Name.ToString ());
}
+ return resolved;
+ }
- return resolved_ns;
+ DeclSpace IResolveContext.DeclContainer {
+ get { return NamespaceEntry.SlaveDeclSpace; }
+ }
+
+ DeclSpace IResolveContext.GenericDeclContainer {
+ get { return NamespaceEntry.SlaveDeclSpace; }
+ }
+
+ bool IResolveContext.IsInObsoleteScope {
+ get { return false; }
+ }
+ bool IResolveContext.IsInUnsafeScope {
+ get { return false; }
}
}
- public class AliasEntry {
+ public abstract class AliasEntry {
public readonly string Name;
- public readonly MemberName Alias;
public readonly NamespaceEntry NamespaceEntry;
public readonly Location Location;
- public AliasEntry (NamespaceEntry entry, string name, MemberName alias, Location loc)
+ protected AliasEntry (NamespaceEntry entry, string name, Location loc)
{
Name = name;
- Alias = alias;
NamespaceEntry = entry;
Location = loc;
}
+
+ protected FullNamedExpression resolved;
+ bool error;
- object resolved;
-
- public object Resolve ()
+ public FullNamedExpression Resolve ()
{
- if (resolved != null)
+ if (resolved != null || error)
return resolved;
+ resolved = DoResolve ();
+ if (resolved == null)
+ error = true;
+ return resolved;
+ }
- string alias = Alias.GetPartialName ();
-
- // According to section 16.3.1, the namespace-or-type-name is resolved
- // as if the immediately containing namespace body has no using-directives.
- resolved = NamespaceEntry.Lookup (null, alias, true, Location);
+ protected abstract FullNamedExpression DoResolve ();
+ }
- NamespaceEntry curr_ns = NamespaceEntry.Parent;
+ public class LocalAliasEntry : AliasEntry, IResolveContext {
+ public readonly Expression Alias;
+
+ public LocalAliasEntry (NamespaceEntry entry, string name, MemberName alias, Location loc) :
+ base (entry, name, loc)
+ {
+ Alias = alias.GetTypeExpression ();
+ }
- while ((curr_ns != null) && (resolved == null)) {
- resolved = curr_ns.Lookup (null, alias, false, Location);
+ protected override FullNamedExpression DoResolve ()
+ {
+ resolved = Alias.ResolveAsTypeStep (this, false);
+ if (resolved == null)
+ return null;
- if (resolved == null)
- curr_ns = curr_ns.Parent;
+ if (resolved.Type != null) {
+ TypeAttributes attr = resolved.Type.Attributes & TypeAttributes.VisibilityMask;
+ if (attr == TypeAttributes.NestedPrivate || attr == TypeAttributes.NestedFamily ||
+ ((attr == TypeAttributes.NestedFamORAssem || attr == TypeAttributes.NestedAssembly) &&
+ TypeManager.LookupDeclSpace (resolved.Type) == null)) {
+ Expression.ErrorIsInaccesible (Alias.Location, Alias.ToString ());
+ return null;
+ }
}
return resolved;
}
+
+ DeclSpace IResolveContext.DeclContainer {
+ get { return NamespaceEntry.SlaveDeclSpace; }
+ }
+
+ DeclSpace IResolveContext.GenericDeclContainer {
+ get { return NamespaceEntry.SlaveDeclSpace; }
+ }
+
+ bool IResolveContext.IsInObsoleteScope {
+ get { return false; }
+ }
+ bool IResolveContext.IsInUnsafeScope {
+ get { return false; }
+ }
}
- public NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, Location loc)
- : this (parent, file, name, false, loc)
- { }
+ public class ExternAliasEntry : AliasEntry {
+ public ExternAliasEntry (NamespaceEntry entry, string name, Location loc) :
+ base (entry, name, loc)
+ {
+ }
+
+ protected override FullNamedExpression DoResolve ()
+ {
+ resolved = RootNamespace.GetRootNamespace (Name);
+ if (resolved == null)
+ Report.Error (430, Location, "The extern alias '" + Name +
+ "' was not specified in a /reference option");
- protected NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, bool is_implicit, Location loc)
+ return resolved;
+ }
+ }
+
+ public NamespaceEntry (NamespaceEntry parent, SourceFile file, string name)
{
this.parent = parent;
this.file = file;
- this.IsImplicit = is_implicit;
- this.ID = ++next_id;
+ entries.Add (this);
+ this.ID = entries.Count;
- if (!is_implicit && (parent != null))
+ if (parent != null)
ns = parent.NS.GetNamespace (name, true);
else if (name != null)
- ns = Namespace.LookupNamespace (name, true);
+ ns = RootNamespace.Global.GetNamespace (name, true);
else
- ns = Namespace.Root;
- ns.AddNamespaceEntry (this);
+ ns = RootNamespace.Global;
+ SlaveDeclSpace = new RootDeclSpace (this);
+ }
- if ((parent != null) && (parent.NS != ns.Parent))
- implicit_parent = new NamespaceEntry (parent, file, ns.Parent.Name, true, loc);
- else
- implicit_parent = parent;
+ private NamespaceEntry (NamespaceEntry parent, SourceFile file, Namespace ns, bool slave)
+ {
+ this.parent = parent;
+ this.file = file;
+ // no need to add self to 'entries', since we don't have any aliases or using entries.
+ this.ID = -1;
+ this.IsImplicit = true;
+ this.ns = ns;
+ this.SlaveDeclSpace = slave ? new RootDeclSpace (this) : null;
+ }
- this.FullName = ns.Name;
+ //
+ // According to section 16.3.1 (using-alias-directive), the namespace-or-type-name is
+ // resolved as if the immediately containing namespace body has no using-directives.
+ //
+ // Section 16.3.2 says that the same rule is applied when resolving the namespace-name
+ // in the using-namespace-directive.
+ //
+ // To implement these rules, the expressions in the using directives are resolved using
+ // the "doppelganger" (ghostly bodiless duplicate).
+ //
+ NamespaceEntry doppelganger;
+ NamespaceEntry Doppelganger {
+ get {
+ if (!IsImplicit && doppelganger == null)
+ doppelganger = new NamespaceEntry (ImplicitParent, file, ns, true);
+ return doppelganger;
+ }
}
- static int next_id = 0;
- public readonly string FullName;
public readonly int ID;
public readonly bool IsImplicit;
public Namespace NS {
- get {
- return ns;
- }
+ get { return ns; }
}
public NamespaceEntry Parent {
- get {
- return parent;
- }
+ get { return parent; }
}
public NamespaceEntry ImplicitParent {
get {
+ if (parent == null)
+ return null;
+ if (implicit_parent == null) {
+ implicit_parent = (parent.NS == ns.Parent)
+ ? parent
+ : new NamespaceEntry (parent, file, ns.Parent, false);
+ }
return implicit_parent;
}
}
- public void DefineName (string name, object o)
- {
- ns.DefineName (name, o);
- }
-
/// <summary>
/// Records a new namespace for resolving name references
/// </summary>
- public void Using (string ns, Location loc)
+ public void Using (MemberName name, Location loc)
{
if (DeclarationFound){
- Report.Error (1529, loc, "A using clause must precede all other namespace elements");
+ Report.Error (1529, loc, "A using clause must precede all other namespace elements except extern alias declarations");
return;
}
- if (ns == FullName)
+ UsingFound = true;
+
+ if (name.Equals (ns.MemberName))
return;
if (using_clauses == null)
using_clauses = new ArrayList ();
foreach (UsingEntry old_entry in using_clauses) {
- if (old_entry.Name == ns) {
- if (RootContext.WarningLevel >= 3)
- Report.Warning (105, loc, "The using directive for '{0}' appeared previously in this namespace", ns);
+ if (name.Equals (old_entry.Name)) {
+ Report.Warning (105, 3, loc, "The using directive for `{0}' appeared previously in this namespace", name.GetName ());
return;
}
}
-
- UsingEntry ue = new UsingEntry (this, ns, loc);
+
+ UsingEntry ue = new UsingEntry (Doppelganger, name, loc);
using_clauses.Add (ue);
}
public void UsingAlias (string name, MemberName alias, Location loc)
{
if (DeclarationFound){
- Report.Error (1529, loc, "A using clause must precede all other namespace elements");
+ Report.Error (1529, loc, "A using clause must precede all other namespace elements except extern alias declarations");
return;
}
+ UsingFound = true;
+
if (aliases == null)
aliases = new Hashtable ();
-
- if (aliases.Contains (name)){
- Report.Error (1537, loc, "The using alias `" + name +
- "' appeared previously in this namespace");
+
+ if (aliases.Contains (name)) {
+ AliasEntry ae = (AliasEntry) aliases [name];
+ Report.SymbolRelatedToPreviousError (ae.Location, ae.Name);
+ Report.Error (1537, loc, "The using alias `{0}' appeared previously in this namespace", name);
return;
}
- aliases [name] = new AliasEntry (this, name, alias, loc);
- }
-
- protected AliasEntry GetAliasEntry (string alias)
- {
- AliasEntry entry = null;
+ if (RootContext.Version == LanguageVersion.Default &&
+ name == "global" && RootContext.WarningLevel >= 2)
+ Report.Warning (440, 2, loc, "An alias named `global' will not be used when resolving 'global::';" +
+ " the global namespace will be used instead");
- if (aliases != null)
- entry = (AliasEntry) aliases [alias];
- if (entry == null && Parent != null)
- entry = Parent.GetAliasEntry (alias);
+ // FIXME: get correct error number. See if the above check can be merged
+ if (extern_aliases != null && extern_aliases.Contains (name)) {
+ AliasEntry ae = (AliasEntry) extern_aliases [name];
+ Report.SymbolRelatedToPreviousError (ae.Location, ae.Name);
+ Report.Error (1537, loc, "The using alias `{0}' appeared previously in this namespace", name);
+ return;
+ }
- return entry;
+ aliases [name] = new LocalAliasEntry (Doppelganger, name, alias, loc);
}
- public string LookupAlias (string alias)
+ public void UsingExternalAlias (string name, Location loc)
{
- AliasEntry entry = GetAliasEntry (alias);
+ if (UsingFound || DeclarationFound) {
+ Report.Error (439, loc, "An extern alias declaration must precede all other elements");
+ return;
+ }
+
+ // Share the extern_aliases field with the Doppelganger
+ if (extern_aliases == null) {
+ extern_aliases = new ListDictionary ();
+ Doppelganger.extern_aliases = extern_aliases;
+ }
- if (entry == null)
- return null;
+ if (extern_aliases.Contains (name)) {
+ AliasEntry ae = (AliasEntry) extern_aliases [name];
+ Report.SymbolRelatedToPreviousError (ae.Location, ae.Name);
+ Report.Error (1537, loc, "The using alias `{0}' appeared previously in this namespace", name);
+ return;
+ }
- object resolved = entry.Resolve ();
- if (resolved == null)
- return null;
- else if (resolved is Namespace)
- return ((Namespace) resolved).Name;
- else
- return ((Type) resolved).FullName;
+ if (name == "global") {
+ Report.Error (1681, loc, "You cannot redefine the global extern alias");
+ return;
+ }
+
+ // Register the alias in aliases and extern_aliases, since we need both of them
+ // to keep things simple (different resolution scenarios)
+ ExternAliasEntry alias = new ExternAliasEntry (Doppelganger, name, loc);
+ extern_aliases [name] = alias;
}
- public object Lookup (DeclSpace ds, string name, bool ignore_using, Location loc)
+ public FullNamedExpression LookupNamespaceOrType (DeclSpace ds, string name, Location loc, bool ignore_cs0104)
{
- object o;
- Namespace ns;
-
- //
- // If name is of the form `N.I', first lookup `N', then search a member `I' in it.
- //
- int pos = name.IndexOf ('.');
- if (pos >= 0) {
- string first = name.Substring (0, pos);
- string last = name.Substring (pos + 1);
-
- o = Lookup (ds, first, ignore_using, loc);
- if (o == null)
- return null;
-
- ns = o as Namespace;
- if (ns != null)
- return ns.Lookup (ds, last);
+ // Precondition: Only simple names (no dots) will be looked up with this function.
+ FullNamedExpression resolved = null;
+ for (NamespaceEntry curr_ns = this; curr_ns != null; curr_ns = curr_ns.ImplicitParent) {
+ if ((resolved = curr_ns.Lookup (ds, name, loc, ignore_cs0104)) != null)
+ break;
+ }
+ return resolved;
+ }
- Type nested = TypeManager.LookupType ((((Type) o).Name + "." + last));
- if ((nested == null) || ((ds != null) && !ds.CheckAccessLevel (nested)))
- return null;
+ static void Error_AmbiguousTypeReference (Location loc, string name, FullNamedExpression t1, FullNamedExpression t2)
+ {
+ Report.Error (104, loc, "`{0}' is an ambiguous reference between `{1}' and `{2}'",
+ name, t1.FullName, t2.FullName);
+ }
- return nested;
+ // Looks-up a alias named @name in this and surrounding namespace declarations
+ public FullNamedExpression LookupAlias (string name)
+ {
+ AliasEntry entry = null;
+ for (NamespaceEntry n = this; n != null; n = n.ImplicitParent) {
+ if (n.extern_aliases != null && (entry = n.extern_aliases [name] as AliasEntry) != null)
+ break;
+ if (n.aliases != null && (entry = n.aliases [name] as AliasEntry) != null)
+ break;
}
+ return entry == null ? null : entry.Resolve ();
+ }
+ private FullNamedExpression Lookup (DeclSpace ds, string name, Location loc, bool ignore_cs0104)
+ {
//
- // Check whether it's a namespace.
+ // Check whether it's in the namespace.
//
- o = NS.Lookup (ds, name);
- if (o != null)
- return o;
-
- if (ignore_using)
+ FullNamedExpression fne = NS.Lookup (ds, name, loc);
+ if (fne != null)
+ return fne;
+
+ if (extern_aliases != null) {
+ AliasEntry entry = extern_aliases [name] as AliasEntry;
+ if (entry != null)
+ return entry.Resolve ();
+ }
+
+ if (IsImplicit)
return null;
-
+
//
- // Check aliases.
+ // Check aliases.
//
- AliasEntry entry = GetAliasEntry (name);
- if (entry != null) {
- o = entry.Resolve ();
- if (o != null)
- return o;
+ if (aliases != null) {
+ AliasEntry entry = aliases [name] as AliasEntry;
+ if (entry != null)
+ return entry.Resolve ();
}
- if (name.IndexOf ('.') > 0)
- return null;
-
//
// Check using entries.
//
- Type t = null, match = null;
+ FullNamedExpression match = null;
foreach (Namespace using_ns in GetUsingTable ()) {
- match = using_ns.Lookup (ds, name) as Type;
- if (match != null){
- if (t != null) {
- DeclSpace.Error_AmbiguousTypeReference (loc, name, t, match);
- return null;
- } else {
- t = match;
- }
+ match = using_ns.Lookup (ds, name, loc);
+ if (match == null || !(match is TypeExpr))
+ continue;
+ if (fne != null) {
+ if (!ignore_cs0104)
+ Error_AmbiguousTypeReference (loc, name, fne, match);
+ return null;
}
+ fne = match;
}
- return t;
+ return fne;
}
// Our cached computation.
+ readonly Namespace [] empty_namespaces = new Namespace [0];
Namespace [] namespace_using_table;
- public Namespace[] GetUsingTable ()
+ Namespace [] GetUsingTable ()
{
if (namespace_using_table != null)
return namespace_using_table;
-
- if (using_clauses == null)
- return new Namespace [0];
+
+ if (using_clauses == null) {
+ namespace_using_table = empty_namespaces;
+ return namespace_using_table;
+ }
ArrayList list = new ArrayList (using_clauses.Count);
return namespace_using_table;
}
- public void DefineNamespace (SymbolWriter symwriter)
- {
- if (symfile_id != 0)
- return;
- if (parent != null)
- parent.DefineNamespace (symwriter);
-
- string[] using_list;
- if (using_clauses != null) {
- using_list = new string [using_clauses.Count];
- for (int i = 0; i < using_clauses.Count; i++)
- using_list [i] = ((UsingEntry) using_clauses [i]).Name;
- } else {
- using_list = new string [0];
- }
-
- int parent_id = parent != null ? parent.symfile_id : 0;
- if (file.SourceFileEntry == null)
- return;
-
- symfile_id = symwriter.DefineNamespace (
- ns.Name, file.SourceFileEntry, using_list, parent_id);
- }
+ readonly string [] empty_using_list = new string [0];
public int SymbolFileID {
get {
+ if (symfile_id == 0 && file.SourceFileEntry != null) {
+ int parent_id = parent == null ? 0 : parent.SymbolFileID;
+
+ string [] using_list = empty_using_list;
+ if (using_clauses != null) {
+ using_list = new string [using_clauses.Count];
+ for (int i = 0; i < using_clauses.Count; i++)
+ using_list [i] = ((UsingEntry) using_clauses [i]).Name.ToString ();
+ }
+
+ symfile_id = CodeGen.SymbolWriter.DefineNamespace (ns.Name, file.SourceFileEntry, using_list, parent_id);
+ }
return symfile_id;
}
}
{
Console.WriteLine (" Try using -r:" + s);
}
-
+
static void MsgtryPkg (string s)
{
Console.WriteLine (" Try using -pkg:" + s);
}
- protected void error246 (Location loc, string name)
+ public static void Error_NamespaceNotFound (Location loc, string name)
{
- if (TypeManager.LookupType (name) != null)
- Report.Error (138, loc, "The using keyword only lets you specify a namespace, " +
- "`" + name + "' is a class not a namespace.");
- else {
- Report.Error (246, loc, "The namespace `" + name +
- "' can not be found (missing assembly reference?)");
-
- switch (name){
- case "Gtk": case "GtkSharp":
- MsgtryPkg ("gtk-sharp");
- break;
-
- case "Gdk": case "GdkSharp":
- MsgtryPkg ("gdk-sharp");
- break;
-
- case "Glade": case "GladeSharp":
- MsgtryPkg ("glade-sharp");
- break;
-
- case "System.Drawing":
- MsgtryRef ("System.Drawing");
- break;
-
- case "System.Web.Services":
- MsgtryRef ("System.Web.Services");
- break;
-
- case "System.Web":
- MsgtryRef ("System.Web");
- break;
-
- case "System.Data":
- MsgtryRef ("System.Data");
- break;
-
- case "System.Windows.Forms":
- MsgtryRef ("System.Windows.Forms");
- break;
- }
+ Report.Error (246, loc, "The type or namespace name `{0}' could not be found. Are you missing a using directive or an assembly reference?",
+ name);
+
+ switch (name) {
+ case "Gtk": case "GtkSharp":
+ MsgtryPkg ("gtk-sharp");
+ break;
+
+ case "Gdk": case "GdkSharp":
+ MsgtryPkg ("gdk-sharp");
+ break;
+
+ case "Glade": case "GladeSharp":
+ MsgtryPkg ("glade-sharp");
+ break;
+
+ case "System.Drawing":
+ case "System.Web.Services":
+ case "System.Web":
+ case "System.Data":
+ case "System.Windows.Forms":
+ MsgtryRef (name);
+ break;
}
}
/// Used to validate that all the using clauses are correct
/// after we are finished parsing all the files.
/// </summary>
- public void VerifyUsing ()
+ void VerifyUsing ()
{
- if (using_clauses != null){
- foreach (UsingEntry ue in using_clauses){
- if (ue.Resolve () != null)
- continue;
+ if (extern_aliases != null) {
+ foreach (DictionaryEntry de in extern_aliases)
+ ((AliasEntry) de.Value).Resolve ();
+ }
- error246 (ue.Location, ue.Name);
- }
+ if (using_clauses != null) {
+ foreach (UsingEntry ue in using_clauses)
+ ue.Resolve ();
}
- if (aliases != null){
- foreach (DictionaryEntry de in aliases){
- AliasEntry alias = (AliasEntry) de.Value;
+ if (aliases != null) {
+ foreach (DictionaryEntry de in aliases)
+ ((AliasEntry) de.Value).Resolve ();
+ }
+ }
- if (alias.Resolve () != null)
- continue;
+ /// <summary>
+ /// Used to validate that all the using clauses are correct
+ /// after we are finished parsing all the files.
+ /// </summary>
+ static public void VerifyAllUsing ()
+ {
+ foreach (NamespaceEntry entry in entries)
+ entry.VerifyUsing ();
+ }
- error246 (alias.Location, alias.Alias.GetPartialName ());
- }
- }
+ public string GetSignatureForError ()
+ {
+ return ns.GetSignatureForError ();
}
public override string ToString ()
{
- if (NS == Namespace.Root)
- return "NamespaceEntry (<root>)";
- else
- return String.Format ("NamespaceEntry ({0},{1},{2})", FullName, IsImplicit, ID);
+ return ns.ToString ();
}
}
}
projects / mono.git / blobdiff