using System;
using System.Collections;
+using System.Reflection.Emit;
+using System.Reflection;
-namespace CIR {
+namespace Mono.CSharp {
- // <summary>
- // Base class for structs, classes, enums and interfaces. They all create
- // new declaration spaces. This provides the common foundation
- // for managing those name spaces
- // </summary>
-
- public abstract class DeclSpace {
- string name, basename;
-
- // <summary>
- // The result value from adding an declaration into
- // a struct or a class
- // </summary>
- public enum AdditionResult {
+ /// <summary>
+ /// Base representation for members. This is only used to keep track
+ /// of Name, Location and Modifier flags.
+ /// </summary>
+ public abstract class MemberCore {
+ /// <summary>
+ /// Public name
+ /// </summary>
+ public string Name;
+
+ /// <summary>
+ /// Modifier flags that the user specified in the source code
+ /// </summary>
+ public int ModFlags;
+
+ /// <summary>
+ /// Location where this declaration happens
+ /// </summary>
+ public readonly Location Location;
+
+ public MemberCore (string name, Location loc)
+ {
+ Name = name;
+ Location = loc;
+ }
+
+ protected void WarningNotHiding (TypeContainer parent)
+ {
+ Report.Warning (
+ 109, Location,
+ "The member " + parent.MakeName (Name) + " does not hide an " +
+ "inherited member. The keyword new is not required");
+
+ }
+
+ void Error_CannotChangeAccessModifiers (TypeContainer parent, MethodInfo parent_method,
+ string name)
+ {
//
- // The declaration has been successfully
- // added to the declation space.
+ // FIXME: report the old/new permissions?
//
- Success,
+ Report.Error (
+ 507, Location, parent.MakeName (Name) +
+ ": can't change the access modifiers when overriding inherited " +
+ "member `" + name + "'");
+ }
+
+ //
+ // Performs various checks on the MethodInfo `mb' regarding the modifier flags
+ // that have been defined.
+ //
+ // `name' is the user visible name for reporting errors (this is used to
+ // provide the right name regarding method names and properties)
+ //
+ protected bool CheckMethodAgainstBase (TypeContainer parent, MethodAttributes my_attrs,
+ MethodInfo mb, string name)
+ {
+ bool ok = true;
+
+ if ((ModFlags & Modifiers.OVERRIDE) != 0){
+ if (!(mb.IsAbstract || mb.IsVirtual)){
+ Report.Error (
+ 506, Location, parent.MakeName (Name) +
+ ": cannot override inherited member `" +
+ name + "' because it is not " +
+ "virtual, abstract or override");
+ ok = false;
+ }
+
+ // Now we check that the overriden method is not final
+
+ if (mb.IsFinal) {
+ Report.Error (239, Location, parent.MakeName (Name) + " : cannot " +
+ "override inherited member `" + name +
+ "' because it is sealed.");
+ ok = false;
+ }
+ //
+ // Check that the permissions are not being changed
+ //
+ MethodAttributes thisp = my_attrs & MethodAttributes.MemberAccessMask;
+ MethodAttributes parentp = mb.Attributes & MethodAttributes.MemberAccessMask;
+
+ //
+ // special case for "protected internal"
+ //
+
+ if ((parentp & MethodAttributes.FamORAssem) == MethodAttributes.FamORAssem){
+ //
+ // when overriding protected internal, the method can be declared
+ // protected internal only within the same assembly
+ //
+
+ if ((thisp & MethodAttributes.FamORAssem) == MethodAttributes.FamORAssem){
+ if (parent.TypeBuilder.Assembly != mb.DeclaringType.Assembly){
+ //
+ // assemblies differ - report an error
+ //
+
+ Error_CannotChangeAccessModifiers (parent, mb, name);
+ ok = false;
+ } else if (thisp != parentp) {
+ //
+ // same assembly, but other attributes differ - report an error
+ //
+
+ Error_CannotChangeAccessModifiers (parent, mb, name);
+ ok = false;
+ };
+ } else if ((thisp & MethodAttributes.Family) != MethodAttributes.Family) {
+ //
+ // if it's not "protected internal", it must be "protected"
+ //
+
+ Error_CannotChangeAccessModifiers (parent, mb, name);
+ ok = false;
+ } else if (parent.TypeBuilder.Assembly == mb.DeclaringType.Assembly) {
+ //
+ // protected within the same assembly - an error
+ //
+ Error_CannotChangeAccessModifiers (parent, mb, name);
+ ok = false;
+ } else if ((thisp & ~(MethodAttributes.Family | MethodAttributes.FamORAssem)) !=
+ (parentp & ~(MethodAttributes.Family | MethodAttributes.FamORAssem))) {
+ //
+ // protected ok, but other attributes differ - report an error
+ //
+ Error_CannotChangeAccessModifiers (parent, mb, name);
+ ok = false;
+ }
+ } else {
+ if (thisp != parentp){
+ Error_CannotChangeAccessModifiers (parent, mb, name);
+ ok = false;
+ }
+ }
+ }
+ if (mb.IsVirtual || mb.IsAbstract){
+ if ((ModFlags & (Modifiers.NEW | Modifiers.OVERRIDE)) == 0){
+ if (Name != "Finalize"){
+ Report.Warning (
+ 114, 2, Location, parent.MakeName (Name) +
+ " hides inherited member `" + name +
+ "'. To make the current member override that " +
+ "implementation, add the override keyword, " +
+ "otherwise use the new keyword");
+ ModFlags |= Modifiers.NEW;
+ }
+ }
+ } else {
+ if ((ModFlags & (Modifiers.NEW | Modifiers.OVERRIDE)) == 0){
+ if (Name != "Finalize"){
+ Report.Warning (
+ 108, 1, Location, "The keyword new is required on " +
+ parent.MakeName (Name) + " because it hides " +
+ "inherited member `" + name + "'");
+ ModFlags |= Modifiers.NEW;
+ }
+ }
+ }
+
+ return ok;
+ }
+
+ public abstract bool Define (TypeContainer parent);
+
+ //
+ // Whehter is it ok to use an unsafe pointer in this type container
+ //
+ public bool UnsafeOK (DeclSpace parent)
+ {
//
- // The symbol has already been defined.
+ // First check if this MemberCore modifier flags has unsafe set
//
+ if ((ModFlags & Modifiers.UNSAFE) != 0)
+ return true;
+
+ if (parent.UnsafeContext)
+ return true;
+
+ Expression.UnsafeError (Location);
+ return false;
+ }
+ }
+
+ //
+ // FIXME: This is temporary outside DeclSpace, because I have to fix a bug
+ // in MCS that makes it fail the lookup for the enum
+ //
+
+ /// <summary>
+ /// The result value from adding an declaration into
+ /// a struct or a class
+ /// </summary>
+ public enum AdditionResult {
+ /// <summary>
+ /// The declaration has been successfully
+ /// added to the declation space.
+ /// </summary>
+ Success,
+
+ /// <summary>
+ /// The symbol has already been defined.
+ /// </summary>
NameExists,
- //
- // Returned if the declation being added to the
- // name space clashes with its container name.
- //
- // The only exceptions for this are constructors
- // and static constructors
- //
+ /// <summary>
+ /// Returned if the declation being added to the
+ /// name space clashes with its container name.
+ ///
+ /// The only exceptions for this are constructors
+ /// and static constructors
+ /// </summary>
EnclosingClash,
- //
- // Returned if a constructor was created (because syntactically
- // it looked like a constructor) but was not (because the name
- // of the method is not the same as the container class
- //
- NotAConstructor
- }
+ /// <summary>
+ /// Returned if a constructor was created (because syntactically
+ /// it looked like a constructor) but was not (because the name
+ /// of the method is not the same as the container class
+ /// </summary>
+ NotAConstructor,
- public string Name {
- get {
- return name;
- }
+ /// <summary>
+ /// This is only used by static constructors to emit the
+ /// error 111, but this error for other things really
+ /// happens at another level for other functions.
+ /// </summary>
+ MethodExists
}
- public string Basename {
- get {
- return basename;
- }
- }
+ /// <summary>
+ /// Base class for structs, classes, enumerations and interfaces.
+ /// </summary>
+ /// <remarks>
+ /// They all create new declaration spaces. This
+ /// provides the common foundation for managing those name
+ /// spaces.
+ /// </remarks>
+ public abstract class DeclSpace : MemberCore {
+ /// <summary>
+ /// this points to the actual definition that is being
+ /// created with System.Reflection.Emit
+ /// </summary>
+ public TypeBuilder TypeBuilder;
+
+ /// <summary>
+ /// This variable tracks whether we have Closed the type
+ /// </summary>
+ public bool Created = false;
- // <summary>
- // defined_names is used for toplevel objects
- // </summary>
+ //
+ // This is the namespace in which this typecontainer
+ // was declared. We use this to resolve names.
+ //
+ public Namespace Namespace;
+
+ public Hashtable Cache = new Hashtable ();
+
+ public string Basename;
+
+ /// <summary>
+ /// defined_names is used for toplevel objects
+ /// </summary>
protected Hashtable defined_names;
- public DeclSpace (string name)
+ TypeContainer parent;
+
+ public DeclSpace (TypeContainer parent, string name, Location l)
+ : base (name, l)
{
- this.name = name;
- this.basename = name.Substring (1 + name.LastIndexOf ('.'));
+ Basename = name.Substring (1 + name.LastIndexOf ('.'));
defined_names = new Hashtable ();
+ this.parent = parent;
}
- // <summary>
- // Returns a status code based purely on the name
- // of the member being added
- // </summary>
- protected AdditionResult IsValid (string name)
+ /// <summary>
+ /// Returns a status code based purely on the name
+ /// of the member being added
+ /// </summary>
+ protected AdditionResult IsValid (string basename, string name)
{
- if (name == basename)
+ if (basename == Basename)
return AdditionResult.EnclosingClash;
if (defined_names.Contains (name))
return AdditionResult.Success;
}
- // <summary>
- // Introduce @name into this declaration space and
- // associates it with the object @o. Note that for
- // methods this will just point to the first method. o
- // </summary>
+ public static int length;
+ public static int small;
+
+ /// <summary>
+ /// Introduce @name into this declaration space and
+ /// associates it with the object @o. Note that for
+ /// methods this will just point to the first method. o
+ /// </summary>
protected void DefineName (string name, object o)
{
defined_names.Add (name, o);
+
+#if DEBUGME
+ int p = name.LastIndexOf (".");
+ int l = name.Length;
+ length += l;
+ small += l -p;
+#endif
}
+ /// <summary>
+ /// Returns the object associated with a given name in the declaration
+ /// space. This is the inverse operation of `DefineName'
+ /// </summary>
+ public object GetDefinition (string name)
+ {
+ return defined_names [name];
+ }
+
bool in_transit = false;
- // <summary>
- // This function is used to catch recursive definitions
- // in declarations.
- // </summary>
+ /// <summary>
+ /// This function is used to catch recursive definitions
+ /// in declarations.
+ /// </summary>
public bool InTransit {
get {
return in_transit;
}
}
- abstract public Type Define (Tree tree);
+ public TypeContainer Parent {
+ get {
+ return parent;
+ }
+ }
+
+ /// <summary>
+ /// Looks up the alias for the name
+ /// </summary>
+ public string LookupAlias (string name)
+ {
+ if (Namespace != null)
+ return Namespace.LookupAlias (name);
+ else
+ return null;
+ }
+
+ //
+ // root_types contains all the types. All TopLevel types
+ // hence have a parent that points to `root_types', that is
+ // why there is a non-obvious test down here.
+ //
+ public bool IsTopLevel {
+ get {
+ if (parent != null){
+ if (parent.parent == null)
+ return true;
+ }
+ return false;
+ }
+ }
+
+ public virtual void CloseType ()
+ {
+ if (!Created){
+ try {
+ TypeBuilder.CreateType ();
+ } catch {
+ //
+ // The try/catch is needed because
+ // nested enumerations fail to load when they
+ // are defined.
+ //
+ // Even if this is the right order (enumerations
+ // declared after types).
+ //
+ // Note that this still creates the type and
+ // it is possible to save it
+ }
+ Created = true;
+ }
+ }
+
+ /// <remarks>
+ /// Should be overriten by the appropriate declaration space
+ /// <remarks>
+ public abstract TypeBuilder DefineType ();
+
+ /// <summary>
+ /// Define all members, but don't apply any attributes or do anything which may
+ /// access not-yet-defined classes. This method also creates the MemberCache.
+ /// </summary>
+ public abstract bool DefineMembers (TypeContainer parent);
+
+ //
+ // Whether this is an `unsafe context'
+ //
+ public bool UnsafeContext {
+ get {
+ if ((ModFlags & Modifiers.UNSAFE) != 0)
+ return true;
+ if (parent != null)
+ return parent.UnsafeContext;
+ return false;
+ }
+ }
+
+ public static string MakeFQN (string nsn, string name)
+ {
+ if (nsn == "")
+ return name;
+ return String.Concat (nsn, ".", name);
+ }
+
+ EmitContext type_resolve_ec;
+ EmitContext GetTypeResolveEmitContext (TypeContainer parent, Location loc)
+ {
+ type_resolve_ec = new EmitContext (parent, this, loc, null, null, ModFlags, false);
+ type_resolve_ec.ResolvingTypeTree = true;
+
+ return type_resolve_ec;
+ }
+
+ // <summary>
+ // Looks up the type, as parsed into the expression `e'
+ // </summary>
+ public Type ResolveType (Expression e, bool silent, Location loc)
+ {
+ if (type_resolve_ec == null)
+ type_resolve_ec = GetTypeResolveEmitContext (parent, loc);
+ type_resolve_ec.loc = loc;
+ type_resolve_ec.ContainerType = TypeBuilder;
+
+ int errors = Report.Errors;
+ Expression d = e.ResolveAsTypeTerminal (type_resolve_ec);
+
+ if (d == null || d.eclass != ExprClass.Type){
+ if (!silent && errors == Report.Errors){
+ Report.Error (246, loc, "Cannot find type `"+ e.ToString () +"'");
+ }
+ return null;
+ }
+
+ if (!CheckAccessLevel (d.Type)) {
+ Report. Error (122, loc, "`" + d.Type + "' " +
+ "is inaccessible because of its protection level");
+ return null;
+ }
+
+ return d.Type;
+ }
+
+ // <summary>
+ // Resolves the expression `e' for a type, and will recursively define
+ // types.
+ // </summary>
+ public Expression ResolveTypeExpr (Expression e, bool silent, Location loc)
+ {
+ if (type_resolve_ec == null)
+ type_resolve_ec = GetTypeResolveEmitContext (parent, loc);
+ type_resolve_ec.loc = loc;
+ type_resolve_ec.ContainerType = TypeBuilder;
+
+ Expression d = e.ResolveAsTypeTerminal (type_resolve_ec);
+
+ if (d == null || d.eclass != ExprClass.Type){
+ if (!silent){
+ Report.Error (246, loc, "Cannot find type `"+ e +"'");
+ }
+ return null;
+ }
+
+ return d;
+ }
+
+ public bool CheckAccessLevel (Type check_type)
+ {
+ if (check_type == TypeBuilder)
+ return true;
+
+ TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
+
+ //
+ // Broken Microsoft runtime, return public for arrays, no matter what
+ // the accessibility is for their underlying class, and they return
+ // NonPublic visibility for pointers
+ //
+ if (check_type.IsArray || check_type.IsPointer)
+ return CheckAccessLevel (check_type.GetElementType ());
+
+ if (check_attr == TypeAttributes.Public)
+ return true;
+
+ if (check_attr == TypeAttributes.NestedPublic)
+ return true;
+
+ if (check_attr == TypeAttributes.NestedPrivate){
+ string check_type_name = check_type.FullName;
+ string type_name = TypeBuilder.FullName;
+
+ int cio = check_type_name.LastIndexOf ("+");
+ string container = check_type_name.Substring (0, cio);
+
+ //
+ // Check if the check_type is a nested class of the current type
+ //
+ if (check_type_name.StartsWith (type_name + "+")){
+ return true;
+ }
+
+ if (type_name.StartsWith (container)){
+ return true;
+ }
+
+ return false;
+ }
+
+ if (check_type.Assembly == TypeBuilder.Assembly){
+ return true;
+ }
+
+ return false;
+
+ }
+
+
+ Type LookupInterfaceOrClass (string ns, string name, out bool error)
+ {
+ DeclSpace parent;
+ Type t;
+
+ error = false;
+
+ name = MakeFQN (ns, name);
+
+ t = TypeManager.LookupType (name);
+ if (t != null)
+ return t;
+
+ parent = (DeclSpace) RootContext.Tree.Decls [name];
+ if (parent == null)
+ return null;
+
+ t = parent.DefineType ();
+ if (t == null){
+ Report.Error (146, Location, "Class definition is circular: `"+name+"'");
+ error = true;
+ return null;
+ }
+ return t;
+ }
+
+ public static void Error_AmbiguousTypeReference (Location loc, string name, Type t1, Type t2)
+ {
+ Report.Error (104, loc,
+ String.Format ("`{0}' is an ambiguous reference ({1} or {2}) ", name,
+ t1.FullName, t2.FullName));
+ }
+
+ /// <summary>
+ /// GetType is used to resolve type names at the DeclSpace level.
+ /// Use this to lookup class/struct bases, interface bases or
+ /// delegate type references
+ /// </summary>
+ ///
+ /// <remarks>
+ /// Contrast this to LookupType which is used inside method bodies to
+ /// lookup types that have already been defined. GetType is used
+ /// during the tree resolution process and potentially define
+ /// recursively the type
+ /// </remarks>
+ public Type FindType (Location loc, string name)
+ {
+ Type t;
+ bool error;
+
+ //
+ // For the case the type we are looking for is nested within this one
+ // or is in any base class
+ //
+ DeclSpace containing_ds = this;
+
+ while (containing_ds != null){
+ Type current_type = containing_ds.TypeBuilder;
+
+ while (current_type != null) {
+ string pre = current_type.FullName;
+
+ t = LookupInterfaceOrClass (pre, name, out error);
+ if (error)
+ return null;
+
+ if (t != null)
+ return t;
+
+ current_type = current_type.BaseType;
+ }
+ containing_ds = containing_ds.Parent;
+ }
+
+ //
+ // Attempt to lookup the class on our namespace and all it's implicit parents
+ //
+ for (string ns = Namespace.Name; ns != null; ns = RootContext.ImplicitParent (ns)) {
+ t = LookupInterfaceOrClass (ns, name, out error);
+ if (error)
+ return null;
+
+ if (t != null)
+ return t;
+ }
+
+ //
+ // Attempt to do a direct unqualified lookup
+ //
+ t = LookupInterfaceOrClass ("", name, out error);
+ if (error)
+ return null;
+
+ if (t != null)
+ return t;
+
+ //
+ // Attempt to lookup the class on any of the `using'
+ // namespaces
+ //
+
+ for (Namespace ns = Namespace; ns != null; ns = ns.Parent){
+
+ t = LookupInterfaceOrClass (ns.Name, name, out error);
+ if (error)
+ return null;
+
+ if (t != null)
+ return t;
+
+ //
+ // Now check the using clause list
+ //
+ ArrayList using_list = ns.UsingTable;
+
+ if (using_list == null)
+ continue;
+
+ Type match = null;
+ foreach (Namespace.UsingEntry ue in using_list){
+ match = LookupInterfaceOrClass (ue.Name, name, out error);
+ if (error)
+ return null;
+
+ if (match != null){
+ if (t != null){
+ Error_AmbiguousTypeReference (loc, name, t, match);
+ return null;
+ }
+
+ t = match;
+ }
+ }
+ if (t != null)
+ return t;
+ }
+
+ //Report.Error (246, Location, "Can not find type `"+name+"'");
+ return null;
+ }
+
+ /// <remarks>
+ /// This function is broken and not what you're looking for. It should only
+ /// be used while the type is still being created since it doesn't use the cache
+ /// and relies on the filter doing the member name check.
+ /// </remarks>
+ public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
+ MemberFilter filter, object criteria);
+
+ /// <remarks>
+ /// If we have a MemberCache, return it. This property may return null if the
+ /// class doesn't have a member cache or while it's still being created.
+ /// </remarks>
+ public abstract MemberCache MemberCache {
+ get;
+ }
+ }
+
+ /// <summary>
+ /// This is a readonly list of MemberInfo's.
+ /// </summary>
+ public class MemberList : IList {
+ public readonly IList List;
+ int count;
+
+ /// <summary>
+ /// Create a new MemberList from the given IList.
+ /// </summary>
+ public MemberList (IList list)
+ {
+ if (list != null)
+ this.List = list;
+ else
+ this.List = new ArrayList ();
+ count = List.Count;
+ }
+
+ /// <summary>
+ /// Concatenate the ILists `first' and `second' to a new MemberList.
+ /// </summary>
+ public MemberList (IList first, IList second)
+ {
+ ArrayList list = new ArrayList ();
+ list.AddRange (first);
+ list.AddRange (second);
+ count = list.Count;
+ List = list;
+ }
+
+ public static readonly MemberList Empty = new MemberList (new ArrayList ());
+
+ /// <summary>
+ /// Cast the MemberList into a MemberInfo[] array.
+ /// </summary>
+ /// <remarks>
+ /// This is an expensive operation, only use it if it's really necessary.
+ /// </remarks>
+ public static explicit operator MemberInfo [] (MemberList list)
+ {
+ Timer.StartTimer (TimerType.MiscTimer);
+ MemberInfo [] result = new MemberInfo [list.Count];
+ list.CopyTo (result, 0);
+ Timer.StopTimer (TimerType.MiscTimer);
+ return result;
+ }
+
+ // ICollection
+
+ public int Count {
+ get {
+ return count;
+ }
+ }
+
+ public bool IsSynchronized {
+ get {
+ return List.IsSynchronized;
+ }
+ }
+
+ public object SyncRoot {
+ get {
+ return List.SyncRoot;
+ }
+ }
+
+ public void CopyTo (Array array, int index)
+ {
+ List.CopyTo (array, index);
+ }
+
+ // IEnumerable
+
+ public IEnumerator GetEnumerator ()
+ {
+ return List.GetEnumerator ();
+ }
+
+ // IList
+
+ public bool IsFixedSize {
+ get {
+ return true;
+ }
+ }
+
+ public bool IsReadOnly {
+ get {
+ return true;
+ }
+ }
+
+ object IList.this [int index] {
+ get {
+ return List [index];
+ }
+
+ set {
+ throw new NotSupportedException ();
+ }
+ }
+
+ // FIXME: try to find out whether we can avoid the cast in this indexer.
+ public MemberInfo this [int index] {
+ get {
+ return (MemberInfo) List [index];
+ }
+ }
+
+ public int Add (object value)
+ {
+ throw new NotSupportedException ();
+ }
+
+ public void Clear ()
+ {
+ throw new NotSupportedException ();
+ }
+
+ public bool Contains (object value)
+ {
+ return List.Contains (value);
+ }
+
+ public int IndexOf (object value)
+ {
+ return List.IndexOf (value);
+ }
+
+ public void Insert (int index, object value)
+ {
+ throw new NotSupportedException ();
+ }
+
+ public void Remove (object value)
+ {
+ throw new NotSupportedException ();
+ }
+
+ public void RemoveAt (int index)
+ {
+ throw new NotSupportedException ();
+ }
+ }
+
+ /// <summary>
+ /// This interface is used to get all members of a class when creating the
+ /// member cache. It must be implemented by all DeclSpace derivatives which
+ /// want to support the member cache and by TypeHandle to get caching of
+ /// non-dynamic types.
+ /// </summary>
+ public interface IMemberContainer {
+ /// <summary>
+ /// The name of the IMemberContainer. This is only used for
+ /// debugging purposes.
+ /// </summary>
+ string Name {
+ get;
+ }
+
+ /// <summary>
+ /// The type of this IMemberContainer.
+ /// </summary>
+ Type Type {
+ get;
+ }
+
+ /// <summary>
+ /// Returns the IMemberContainer of the parent class or null if this
+ /// is an interface or TypeManger.object_type.
+ /// This is used when creating the member cache for a class to get all
+ /// members from the parent class.
+ /// </summary>
+ IMemberContainer Parent {
+ get;
+ }
+
+ /// <summary>
+ /// Whether this is an interface.
+ /// </summary>
+ bool IsInterface {
+ get;
+ }
+
+ /// <summary>
+ /// Returns all members of this class with the corresponding MemberTypes
+ /// and BindingFlags.
+ /// </summary>
+ /// <remarks>
+ /// When implementing this method, make sure not to return any inherited
+ /// members and check the MemberTypes and BindingFlags properly.
+ /// Unfortunately, System.Reflection is lame and doesn't provide a way to
+ /// get the BindingFlags (static/non-static,public/non-public) in the
+ /// MemberInfo class, but the cache needs this information. That's why
+ /// this method is called multiple times with different BindingFlags.
+ /// </remarks>
+ MemberList GetMembers (MemberTypes mt, BindingFlags bf);
+
+ /// <summary>
+ /// Return the container's member cache.
+ /// </summary>
+ MemberCache MemberCache {
+ get;
+ }
+ }
+
+ /// <summary>
+ /// The MemberCache is used by dynamic and non-dynamic types to speed up
+ /// member lookups. It has a member name based hash table; it maps each member
+ /// name to a list of CacheEntry objects. Each CacheEntry contains a MemberInfo
+ /// and the BindingFlags that were initially used to get it. The cache contains
+ /// all members of the current class and all inherited members. If this cache is
+ /// for an interface types, it also contains all inherited members.
+ ///
+ /// There are two ways to get a MemberCache:
+ /// * if this is a dynamic type, lookup the corresponding DeclSpace and then
+ /// use the DeclSpace.MemberCache property.
+ /// * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
+ /// TypeHandle instance for the type and then use TypeHandle.MemberCache.
+ /// </summary>
+ public class MemberCache {
+ public readonly IMemberContainer Container;
+ protected Hashtable member_hash;
+ protected Hashtable method_hash;
+ protected Hashtable interface_hash;
+
+ /// <summary>
+ /// Create a new MemberCache for the given IMemberContainer `container'.
+ /// </summary>
+ public MemberCache (IMemberContainer container)
+ {
+ this.Container = container;
+
+ Timer.IncrementCounter (CounterType.MemberCache);
+ Timer.StartTimer (TimerType.CacheInit);
+
+ interface_hash = new Hashtable ();
+
+ // If we have a parent class (we have a parent class unless we're
+ // TypeManager.object_type), we deep-copy its MemberCache here.
+ if (Container.Parent != null)
+ member_hash = SetupCache (Container.Parent.MemberCache);
+ else if (Container.IsInterface)
+ member_hash = SetupCacheForInterface ();
+ else
+ member_hash = new Hashtable ();
+
+ // If this is neither a dynamic type nor an interface, create a special
+ // method cache with all declared and inherited methods.
+ Type type = container.Type;
+ if (!(type is TypeBuilder) && !type.IsInterface) {
+ method_hash = new Hashtable ();
+ AddMethods (type);
+ }
+
+ // Add all members from the current class.
+ AddMembers (Container);
+
+ Timer.StopTimer (TimerType.CacheInit);
+ }
+
+ /// <summary>
+ /// Bootstrap this member cache by doing a deep-copy of our parent.
+ /// </summary>
+ Hashtable SetupCache (MemberCache parent)
+ {
+ Hashtable hash = new Hashtable ();
+
+ IDictionaryEnumerator it = parent.member_hash.GetEnumerator ();
+ while (it.MoveNext ()) {
+ hash [it.Key] = ((ArrayList) it.Value).Clone ();
+ }
+
+ return hash;
+ }
+
+ void AddInterfaces (MemberCache parent)
+ {
+ foreach (Type iface in parent.interface_hash.Keys) {
+ if (!interface_hash.Contains (iface))
+ interface_hash.Add (iface, true);
+ }
+ }
+
+ /// <summary>
+ /// Add the contents of `new_hash' to `hash'.
+ /// </summary>
+ void AddHashtable (Hashtable hash, Hashtable new_hash)
+ {
+ IDictionaryEnumerator it = new_hash.GetEnumerator ();
+ while (it.MoveNext ()) {
+ ArrayList list = (ArrayList) hash [it.Key];
+ if (list != null)
+ list.AddRange ((ArrayList) it.Value);
+ else
+ hash [it.Key] = ((ArrayList) it.Value).Clone ();
+ }
+ }
+
+ /// <summary>
+ /// Bootstrap the member cache for an interface type.
+ /// Type.GetMembers() won't return any inherited members for interface types,
+ /// so we need to do this manually. Interfaces also inherit from System.Object.
+ /// </summary>
+ Hashtable SetupCacheForInterface ()
+ {
+ Hashtable hash = SetupCache (TypeHandle.ObjectType.MemberCache);
+ Type [] ifaces = TypeManager.GetInterfaces (Container.Type);
+
+ foreach (Type iface in ifaces) {
+ if (interface_hash.Contains (iface))
+ continue;
+ interface_hash.Add (iface, true);
+
+ IMemberContainer iface_container =
+ TypeManager.LookupMemberContainer (iface);
+
+ MemberCache iface_cache = iface_container.MemberCache;
+ AddHashtable (hash, iface_cache.member_hash);
+ AddInterfaces (iface_cache);
+ }
+
+ return hash;
+ }
+
+ /// <summary>
+ /// Add all members from class `container' to the cache.
+ /// </summary>
+ void AddMembers (IMemberContainer container)
+ {
+ // We need to call AddMembers() with a single member type at a time
+ // to get the member type part of CacheEntry.EntryType right.
+ AddMembers (MemberTypes.Constructor, container);
+ AddMembers (MemberTypes.Field, container);
+ AddMembers (MemberTypes.Method, container);
+ AddMembers (MemberTypes.Property, container);
+ AddMembers (MemberTypes.Event, container);
+ // Nested types are returned by both Static and Instance searches.
+ AddMembers (MemberTypes.NestedType,
+ BindingFlags.Static | BindingFlags.Public, container);
+ AddMembers (MemberTypes.NestedType,
+ BindingFlags.Static | BindingFlags.NonPublic, container);
+ }
+
+ void AddMembers (MemberTypes mt, IMemberContainer container)
+ {
+ AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
+ AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
+ AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
+ AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
+ }
+
+ /// <summary>
+ /// Add all members from class `container' with the requested MemberTypes and
+ /// BindingFlags to the cache. This method is called multiple times with different
+ /// MemberTypes and BindingFlags.
+ /// </summary>
+ void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
+ {
+ MemberList members = container.GetMembers (mt, bf);
+ BindingFlags new_bf = (container == Container) ?
+ bf | BindingFlags.DeclaredOnly : bf;
+
+ foreach (MemberInfo member in members) {
+ string name = member.Name;
+
+ // We use a name-based hash table of ArrayList's.
+ ArrayList list = (ArrayList) member_hash [name];
+ if (list == null) {
+ list = new ArrayList ();
+ member_hash.Add (name, list);
+ }
+
+ // When this method is called for the current class, the list will
+ // already contain all inherited members from our parent classes.
+ // We cannot add new members in front of the list since this'd be an
+ // expensive operation, that's why the list is sorted in reverse order
+ // (ie. members from the current class are coming last).
+ list.Add (new CacheEntry (container, member, mt, bf));
+ }
+ }
+
+ /// <summary>
+ /// Add all declared and inherited methods from class `type' to the method cache.
+ /// </summary>
+ void AddMethods (Type type)
+ {
+ AddMethods (BindingFlags.Static | BindingFlags.Public |
+ BindingFlags.FlattenHierarchy, type);
+ AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
+ BindingFlags.FlattenHierarchy, type);
+ AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
+ AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
+ }
+
+ void AddMethods (BindingFlags bf, Type type)
+ {
+ MemberInfo [] members = type.GetMethods (bf);
+
+ foreach (MethodBase member in members) {
+ string name = member.Name;
+
+ // Varargs methods aren't allowed in C# code.
+ if ((member.CallingConvention & CallingConventions.VarArgs) != 0)
+ continue;
+
+ // We use a name-based hash table of ArrayList's.
+ ArrayList list = (ArrayList) method_hash [name];
+ if (list == null) {
+ list = new ArrayList ();
+ method_hash.Add (name, list);
+ }
+
+ // Unfortunately, the elements returned by Type.GetMethods() aren't
+ // sorted so we need to do this check for every member.
+ BindingFlags new_bf = bf;
+ if (member.DeclaringType == type)
+ new_bf |= BindingFlags.DeclaredOnly;
+
+ list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
+ }
+ }
+
+ /// <summary>
+ /// Compute and return a appropriate `EntryType' magic number for the given
+ /// MemberTypes and BindingFlags.
+ /// </summary>
+ protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
+ {
+ EntryType type = EntryType.None;
+
+ if ((mt & MemberTypes.Constructor) != 0)
+ type |= EntryType.Constructor;
+ if ((mt & MemberTypes.Event) != 0)
+ type |= EntryType.Event;
+ if ((mt & MemberTypes.Field) != 0)
+ type |= EntryType.Field;
+ if ((mt & MemberTypes.Method) != 0)
+ type |= EntryType.Method;
+ if ((mt & MemberTypes.Property) != 0)
+ type |= EntryType.Property;
+ // Nested types are returned by static and instance searches.
+ if ((mt & MemberTypes.NestedType) != 0)
+ type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
+
+ if ((bf & BindingFlags.Instance) != 0)
+ type |= EntryType.Instance;
+ if ((bf & BindingFlags.Static) != 0)
+ type |= EntryType.Static;
+ if ((bf & BindingFlags.Public) != 0)
+ type |= EntryType.Public;
+ if ((bf & BindingFlags.NonPublic) != 0)
+ type |= EntryType.NonPublic;
+ if ((bf & BindingFlags.DeclaredOnly) != 0)
+ type |= EntryType.Declared;
+
+ return type;
+ }
+
+ /// <summary>
+ /// The `MemberTypes' enumeration type is a [Flags] type which means that it may
+ /// denote multiple member types. Returns true if the given flags value denotes a
+ /// single member types.
+ /// </summary>
+ public static bool IsSingleMemberType (MemberTypes mt)
+ {
+ switch (mt) {
+ case MemberTypes.Constructor:
+ case MemberTypes.Event:
+ case MemberTypes.Field:
+ case MemberTypes.Method:
+ case MemberTypes.Property:
+ case MemberTypes.NestedType:
+ return true;
+
+ default:
+ return false;
+ }
+ }
+
+ /// <summary>
+ /// We encode the MemberTypes and BindingFlags of each members in a "magic"
+ /// number to speed up the searching process.
+ /// </summary>
+ [Flags]
+ protected enum EntryType {
+ None = 0x000,
+
+ Instance = 0x001,
+ Static = 0x002,
+ MaskStatic = Instance|Static,
+
+ Public = 0x004,
+ NonPublic = 0x008,
+ MaskProtection = Public|NonPublic,
+
+ Declared = 0x010,
+
+ Constructor = 0x020,
+ Event = 0x040,
+ Field = 0x080,
+ Method = 0x100,
+ Property = 0x200,
+ NestedType = 0x400,
+
+ MaskType = Constructor|Event|Field|Method|Property|NestedType
+ }
+
+ protected struct CacheEntry {
+ public readonly IMemberContainer Container;
+ public readonly EntryType EntryType;
+ public readonly MemberInfo Member;
+
+ public CacheEntry (IMemberContainer container, MemberInfo member,
+ MemberTypes mt, BindingFlags bf)
+ {
+ this.Container = container;
+ this.Member = member;
+ this.EntryType = GetEntryType (mt, bf);
+ }
+ }
+
+ /// <summary>
+ /// This is called each time we're walking up one level in the class hierarchy
+ /// and checks whether we can abort the search since we've already found what
+ /// we were looking for.
+ /// </summary>
+ protected bool DoneSearching (ArrayList list)
+ {
+ //
+ // We've found exactly one member in the current class and it's not
+ // a method or constructor.
+ //
+ if (list.Count == 1 && !(list [0] is MethodBase))
+ return true;
+
+ //
+ // Multiple properties: we query those just to find out the indexer
+ // name
+ //
+ if ((list.Count > 0) && (list [0] is PropertyInfo))
+ return true;
+
+ return false;
+ }
+
+ /// <summary>
+ /// Looks up members with name `name'. If you provide an optional
+ /// filter function, it'll only be called with members matching the
+ /// requested member name.
+ ///
+ /// This method will try to use the cache to do the lookup if possible.
+ ///
+ /// Unlike other FindMembers implementations, this method will always
+ /// check all inherited members - even when called on an interface type.
+ ///
+ /// If you know that you're only looking for methods, you should use
+ /// MemberTypes.Method alone since this speeds up the lookup a bit.
+ /// When doing a method-only search, it'll try to use a special method
+ /// cache (unless it's a dynamic type or an interface) and the returned
+ /// MemberInfo's will have the correct ReflectedType for inherited methods.
+ /// The lookup process will automatically restart itself in method-only
+ /// search mode if it discovers that it's about to return methods.
+ /// </summary>
+ public MemberList FindMembers (MemberTypes mt, BindingFlags bf, string name,
+ MemberFilter filter, object criteria)
+ {
+ bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
+ bool method_search = mt == MemberTypes.Method;
+ // If we have a method cache and we aren't already doing a method-only search,
+ // then we restart a method search if the first match is a method.
+ bool do_method_search = !method_search && (method_hash != null);
+
+ ArrayList applicable;
+
+ // If this is a method-only search, we try to use the method cache if
+ // possible; a lookup in the method cache will return a MemberInfo with
+ // the correct ReflectedType for inherited methods.
+
+ if (method_search && (method_hash != null))
+ applicable = (ArrayList) method_hash [name];
+ else
+ applicable = (ArrayList) member_hash [name];
+
+ if (applicable == null)
+ return MemberList.Empty;
+
+ ArrayList list = new ArrayList ();
+
+ Timer.StartTimer (TimerType.CachedLookup);
+
+ EntryType type = GetEntryType (mt, bf);
+
+ IMemberContainer current = Container;
+
+ // `applicable' is a list of all members with the given member name `name'
+ // in the current class and all its parent classes. The list is sorted in
+ // reverse order due to the way how the cache is initialy created (to speed
+ // things up, we're doing a deep-copy of our parent).
+
+ for (int i = applicable.Count-1; i >= 0; i--) {
+ CacheEntry entry = (CacheEntry) applicable [i];
+
+ // This happens each time we're walking one level up in the class
+ // hierarchy. If we're doing a DeclaredOnly search, we must abort
+ // the first time this happens (this may already happen in the first
+ // iteration of this loop if there are no members with the name we're
+ // looking for in the current class).
+ if (entry.Container != current) {
+ if (declared_only || DoneSearching (list))
+ break;
+
+ current = entry.Container;
+ }
+
+ // Is the member of the correct type ?
+ if ((entry.EntryType & type & EntryType.MaskType) == 0)
+ continue;
+
+ // Is the member static/non-static ?
+ if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
+ continue;
+
+ // Apply the filter to it.
+ if (filter (entry.Member, criteria)) {
+ if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
+ do_method_search = false;
+ list.Add (entry.Member);
+ }
+ }
+
+ Timer.StopTimer (TimerType.CachedLookup);
+
+ // If we have a method cache and we aren't already doing a method-only
+ // search, we restart in method-only search mode if the first match is
+ // a method. This ensures that we return a MemberInfo with the correct
+ // ReflectedType for inherited methods.
+ if (do_method_search && (list.Count > 0)){
+ return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
+ }
+
+ return new MemberList (list);
+ }
}
}
projects / mono.git / blobdiff