//
// decl.cs: Declaration base class for structs, classes, enums and interfaces.
//
// Author: Miguel de Icaza (miguel@gnu.org)
//
// Licensed under the terms of the GNU GPL
//
// (C) 2001 Ximian, Inc (http://www.ximian.com)
//
// TODO: Move the method verification stuff from the class.cs and interface.cs here
//
using System;
using System.Collections;
using System.Reflection.Emit;
using System.Reflection;
namespace Mono.MonoBASIC {
///
/// Base representation for members. This is only used to keep track
/// of Name, Location and Modifier flags.
///
public abstract class MemberCore : Attributable
{
///
/// Public name
///
public string Name;
///
/// Modifier flags that the user specified in the source code
///
public int ModFlags;
///
/// Location where this declaration happens
///
public readonly Location Location;
public MemberCore (string name, Attributes attrs, Location loc)
: base (attrs)
{
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)
{
//
// FIXME: report the old/new permissions?
//
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){
// Now we check that the overriden method is not final
if (mb.IsFinal)
{
Report.Error (30267, Location, parent.MakeName (Name) + " : cannot " +
"override inherited member `" + name +
"' because it is NotOverridable.");
ok = false;
}
else if (!(mb.IsAbstract || mb.IsVirtual)){
Report.Error (
31086, Location, parent.MakeName (Name) +
": Cannot override inherited member `" +
name + "' because it is not " +
"declared as Overridable");
ok = false;
}
//
// Check that the permissions are not being changed
//
MethodAttributes thisp = my_attrs & MethodAttributes.MemberAccessMask;
MethodAttributes parentp = mb.Attributes & MethodAttributes.MemberAccessMask;
if (thisp != parentp){
Error_CannotChangeAccessModifiers (parent, mb, name);
ok = false;
}
}
if ((ModFlags & ( Modifiers.NEW | Modifiers.SHADOWS | Modifiers.OVERRIDE )) == 0) {
if ((ModFlags & Modifiers.NONVIRTUAL) != 0) {
Report.Error (31088, Location,
parent.MakeName (Name) + " cannot " +
"be declared NotOverridable since this method is " +
"not marked as Overrides");
}
}
if (mb.IsAbstract) {
if ((ModFlags & (Modifiers.OVERRIDE)) == 0) {
if (Name != "Finalize") {
Report.Error (
31404, Location,
name + " cannot Shadows the method " +
parent.MakeName (Name) + " since it is declared " +
"'MustOverride' in base class");
}
}
}
else if (mb.IsVirtual){
if ((ModFlags & (Modifiers.NEW | Modifiers.OVERRIDE | Modifiers.SHADOWS)) == 0){
if (Name != "Finalize"){
Report.Warning (
40005, 2, Location, parent.MakeName (Name) +
" shadows overridable member `" + name +
"'. To make the current member override that " +
"implementation, add the overrides keyword." );
ModFlags |= Modifiers.SHADOWS;
}
}
}
else {
if ((ModFlags & (Modifiers.NEW | Modifiers.OVERRIDE |
Modifiers.SHADOWS)) == 0){
if (Name != "Finalize"){
Report.Warning (
40004, 1, Location, "The keyword Shadows is required on " +
parent.MakeName (Name) + " because it hides " +
"inherited member `" + name + "'");
ModFlags |= Modifiers.SHADOWS;
}
}
}
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)
{
//
// 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
//
///
/// The result value from adding an declaration into
/// a struct or a class
///
public enum AdditionResult {
///
/// The declaration has been successfully
/// added to the declation space.
///
Success,
///
/// The symbol has already been defined.
///
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
///
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,
///
/// 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.
///
MethodExists
}
///
/// Base class for structs, classes, enumerations and interfaces.
///
///
/// They all create new declaration spaces. This
/// provides the common foundation for managing those name
/// spaces.
///
public abstract class DeclSpace : MemberCore {
///
/// this points to the actual definition that is being
/// created with System.Reflection.Emit
///
public TypeBuilder TypeBuilder;
///
/// This variable tracks whether we have Closed the type
///
public bool Created = false;
//
// 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;
///
/// defined_names is used for toplevel objects
///
protected Hashtable defined_names;
TypeContainer parent;
public DeclSpace (TypeContainer parent, string name, Attributes attrs, Location l)
: base (name, attrs, l)
{
Basename = name.Substring (1 + name.LastIndexOf ('.'));
defined_names = new Hashtable ();
this.parent = parent;
}
///
/// Returns a status code based purely on the name
/// of the member being added
///
protected AdditionResult IsValid (string name)
{
if (name == Basename)
return AdditionResult.EnclosingClash;
if (defined_names.Contains (name))
return AdditionResult.NameExists;
return AdditionResult.Success;
}
///
/// 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
///
protected void DefineName (string name, object o)
{
try {
defined_names.Add (name, o);
}
catch (ArgumentException exp) {
Report.Error (30260, /*Location,*/
"More than one defination with same name '" + name +
"' is found in the container '" + Name + "'");
}
}
///
/// Returns the object associated with a given name in the declaration
/// space. This is the inverse operation of `DefineName'
///
public object GetDefinition (string name)
{
return defined_names [name];
}
bool in_transit = false;
///
/// This function is used to catch recursive definitions
/// in declarations.
///
public bool InTransit {
get {
return in_transit;
}
set {
in_transit = value;
}
}
public TypeContainer Parent {
get {
return parent;
}
}
///
/// Looks up the alias for the name
///
public string LookupAlias (string name)
{
return RootContext.SourceBeingCompiled.LookupAlias (name);
}
//
// 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;
}
}
///
/// Should be overriten by the appropriate declaration space
///
public abstract TypeBuilder DefineType ();
///
/// 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.
///
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)
{
string prefix = (nsn == "" ? "" : nsn + ".");
return prefix + 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;
}
//
// Looks up the type, as parsed into the expression `e'
//
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;
int errors = Report.Errors;
Expression d = e.Resolve (type_resolve_ec, ResolveFlags.Type);
if (d == null || d.eclass != ExprClass.Type){
if (!silent && errors == Report.Errors){
Report.Error (30002, loc, "Cannot find type `"+ e.ToString () +"'");
}
return null;
}
return d.Type;
}
//
// Resolves the expression `e' for a type, and will recursively define
// types.
//
public Expression ResolveTypeExpr (Expression e, bool silent, Location loc)
{
if (type_resolve_ec == null)
type_resolve_ec = GetTypeResolveEmitContext (parent, loc);
Expression d = e.Resolve (type_resolve_ec, ResolveFlags.Type);
if (d == null || d.eclass != ExprClass.Type){
if (!silent){
Report.Error (30002, loc, "Cannot find type `"+ e +"'");
}
return null;
}
return d;
}
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 (30256, 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));
}
///
/// GetType is used to resolve type names at the DeclSpace level.
/// Use this to lookup class/struct bases, interface bases or
/// delegate type references
///
///
///
/// 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
///
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
//
ICollection imports_list = RootContext.SourceBeingCompiled.ImportsTable;
if (imports_list == null)
continue;
Type match = null;
foreach (SourceBeingCompiled.ImportsEntry ue in imports_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;
ue.Used = true;
}
}
if (t != null)
return t;
}
//Report.Error (246, Location, "Can not find type `"+name+"'");
return null;
}
///
/// 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.
///
public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
MemberFilter filter, object criteria);
///
/// 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.
///
public abstract MemberCache MemberCache {
get;
}
public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
{
try {
TypeBuilder.SetCustomAttribute (cb);
} catch (System.ArgumentException e) {
Report.Warning (-21, a.Location,
"The CharSet named property on StructLayout\n"+
"\tdoes not work correctly on Microsoft.NET\n"+
"\tYou might want to remove the CharSet declaration\n"+
"\tor compile using the Mono runtime instead of the\n"+
"\tMicrosoft .NET runtime\n"+
"\tThe runtime gave the error: " + e);
}
}
}
///
/// This is a readonly list of MemberInfo's.
///
public class MemberList : IList {
public readonly IList List;
int count;
///
/// Create a new MemberList from the given IList.
///
public MemberList (IList list)
{
if (list != null)
this.List = list;
else
this.List = new ArrayList ();
count = List.Count;
}
///
/// Concatenate the ILists `first' and `second' to a new MemberList.
///
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 ());
///
/// Cast the MemberList into a MemberInfo[] array.
///
///
/// This is an expensive operation, only use it if it's really necessary.
///
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 ();
}
}
///
/// 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.
///
public interface IMemberContainer {
///
/// The name of the IMemberContainer. This is only used for
/// debugging purposes.
///
string Name {
get;
}
///
/// The type of this IMemberContainer.
///
Type Type {
get;
}
///
/// 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.
///
IMemberContainer Parent {
get;
}
///
/// Whether this is an interface.
///
bool IsInterface {
get;
}
///
/// Returns all members of this class with the corresponding MemberTypes
/// and BindingFlags.
///
///
/// 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.
///
MemberList GetMembers (MemberTypes mt, BindingFlags bf);
///
/// Return the container's member cache.
///
MemberCache MemberCache {
get;
}
}
///
/// 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.
///
public class MemberCache {
public readonly IMemberContainer Container;
protected CaseInsensitiveHashtable member_hash;
protected CaseInsensitiveHashtable method_hash;
protected CaseInsensitiveHashtable interface_hash;
///
/// Create a new MemberCache for the given IMemberContainer `container'.
///
public MemberCache (IMemberContainer container)
{
this.Container = container;
Timer.IncrementCounter (CounterType.MemberCache);
Timer.StartTimer (TimerType.CacheInit);
interface_hash = new CaseInsensitiveHashtable ();
// 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 CaseInsensitiveHashtable ();
// 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 CaseInsensitiveHashtable ();
AddMethods (type);
}
// Add all members from the current class.
AddMembers (Container);
Timer.StopTimer (TimerType.CacheInit);
}
///
/// Bootstrap this member cache by doing a deep-copy of our parent.
///
CaseInsensitiveHashtable SetupCache (MemberCache parent)
{
CaseInsensitiveHashtable hash = new CaseInsensitiveHashtable ();
IDictionaryEnumerator it = parent.member_hash.GetEnumerator ();
while (it.MoveNext ()) {
ArrayList al = (ArrayList) it.Value;
// Constructors are never inherited and all have the same key
if ((((CacheEntry)al [0]).EntryType & EntryType.Constructor) == 0)
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);
}
}
///
/// Add the contents of `new_hash' to `hash'.
///
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 ();
}
}
///
/// 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.
///
CaseInsensitiveHashtable SetupCacheForInterface ()
{
CaseInsensitiveHashtable 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;
}
///
/// Add all members from class `container' to the cache.
///
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);
}
///
/// 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.
///
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));
}
}
///
/// Add all declared and inherited methods from class `type' to the method cache.
///
void AddMethods (Type type)
{
AddMethods (BindingFlags.Static | BindingFlags.Public, type);
AddMethods (BindingFlags.Static | BindingFlags.NonPublic, 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));
}
}
///
/// Compute and return a appropriate `EntryType' magic number for the given
/// MemberTypes and BindingFlags.
///
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;
}
///
/// 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.
///
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;
}
}
///
/// We encode the MemberTypes and BindingFlags of each members in a "magic"
/// number to speed up the searching process.
///
[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);
}
}
///
/// 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.
///
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;
}
///
/// 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.
///
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);
bf |= BindingFlags.IgnoreCase;
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);
}
}
}