duke@435: /*
duke@435:  * Copyright 1999-2005 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // A KlassStream is an abstract stream for streaming over self, superclasses
duke@435: // and (super)interfaces. Streaming is done in reverse order (subclasses first,
duke@435: // interfaces last).
duke@435: //
duke@435: //    for (KlassStream st(k, false, false); !st.eos(); st.next()) {
duke@435: //      klassOop k = st.klass();
duke@435: //      ...
duke@435: //    }
duke@435: 
duke@435: class KlassStream VALUE_OBJ_CLASS_SPEC {
duke@435:  protected:
duke@435:   instanceKlassHandle _klass;           // current klass/interface iterated over
duke@435:   objArrayHandle      _interfaces;      // transitive interfaces for initial class
duke@435:   int                 _interface_index; // current interface being processed
duke@435:   bool                _local_only;      // process initial class/interface only
duke@435:   bool                _classes_only;    // process classes only (no interfaces)
duke@435:   int                 _index;
duke@435: 
duke@435:   virtual int length() const = 0;
duke@435: 
duke@435:  public:
duke@435:   // constructor
duke@435:   KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only);
duke@435: 
duke@435:   // testing
duke@435:   bool eos();
duke@435: 
duke@435:   // iterating
duke@435:   virtual void next() = 0;
duke@435: 
duke@435:   // accessors
duke@435:   instanceKlassHandle klass() const { return _klass; }
duke@435:   int index() const                 { return _index; }
duke@435: };
duke@435: 
duke@435: 
duke@435: // A MethodStream streams over all methods in a class, superclasses and (super)interfaces.
duke@435: // Streaming is done in reverse order (subclasses first, methods in reverse order)
duke@435: // Usage:
duke@435: //
duke@435: //    for (MethodStream st(k, false, false); !st.eos(); st.next()) {
duke@435: //      methodOop m = st.method();
duke@435: //      ...
duke@435: //    }
duke@435: 
duke@435: class MethodStream : public KlassStream {
duke@435:  private:
duke@435:   int length() const          { return methods()->length(); }
duke@435:   objArrayOop methods() const { return _klass->methods(); }
duke@435:  public:
duke@435:   MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only)
duke@435:     : KlassStream(klass, local_only, classes_only) {
duke@435:     _index = length();
duke@435:     next();
duke@435:   }
duke@435: 
duke@435:   void next() { _index--; }
duke@435:   methodOop method() const { return methodOop(methods()->obj_at(index())); }
duke@435: };
duke@435: 
duke@435: 
duke@435: // A FieldStream streams over all fields in a class, superclasses and (super)interfaces.
duke@435: // Streaming is done in reverse order (subclasses first, fields in reverse order)
duke@435: // Usage:
duke@435: //
duke@435: //    for (FieldStream st(k, false, false); !st.eos(); st.next()) {
duke@435: //      symbolOop field_name = st.name();
duke@435: //      ...
duke@435: //    }
duke@435: 
duke@435: 
duke@435: class FieldStream : public KlassStream {
duke@435:  private:
duke@435:   int length() const                { return fields()->length(); }
duke@435:   constantPoolOop constants() const { return _klass->constants(); }
duke@435:  protected:
duke@435:   typeArrayOop fields() const       { return _klass->fields(); }
duke@435:  public:
duke@435:   FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only)
duke@435:     : KlassStream(klass, local_only, classes_only) {
duke@435:     _index = length();
duke@435:     next();
duke@435:   }
duke@435: 
duke@435:   void next() { _index -= instanceKlass::next_offset; }
duke@435: 
duke@435:   // Accessors for current field
duke@435:   AccessFlags access_flags() const {
duke@435:     AccessFlags flags;
duke@435:     flags.set_flags(fields()->ushort_at(index() + instanceKlass::access_flags_offset));
duke@435:     return flags;
duke@435:   }
duke@435:   symbolOop name() const {
duke@435:     int name_index = fields()->ushort_at(index() + instanceKlass::name_index_offset);
duke@435:     return constants()->symbol_at(name_index);
duke@435:   }
duke@435:   symbolOop signature() const {
duke@435:     int signature_index = fields()->ushort_at(index() +
duke@435:                                        instanceKlass::signature_index_offset);
duke@435:     return constants()->symbol_at(signature_index);
duke@435:   }
duke@435:   // missing: initval()
duke@435:   int offset() const {
duke@435:     return _klass->offset_from_fields( index() );
duke@435:   }
duke@435: };
duke@435: 
duke@435: class FilteredField {
duke@435:  private:
duke@435:   klassOop _klass;
duke@435:   int      _field_offset;
duke@435: 
duke@435:  public:
duke@435:   FilteredField(klassOop klass, int field_offset) {
duke@435:     _klass = klass;
duke@435:     _field_offset = field_offset;
duke@435:   }
duke@435:   klassOop klass() { return _klass; }
duke@435:   oop* klass_addr() { return (oop*) &_klass; }
duke@435:   int  field_offset() { return _field_offset; }
duke@435: };
duke@435: 
duke@435: class FilteredFieldsMap : AllStatic {
duke@435:  private:
duke@435:   static GrowableArray<FilteredField *> *_filtered_fields;
duke@435:  public:
duke@435:   static void initialize();
duke@435:   static bool is_filtered_field(klassOop klass, int field_offset) {
duke@435:     for (int i=0; i < _filtered_fields->length(); i++) {
duke@435:       if (klass == _filtered_fields->at(i)->klass() &&
duke@435:         field_offset == _filtered_fields->at(i)->field_offset()) {
duke@435:         return true;
duke@435:       }
duke@435:     }
duke@435:     return false;
duke@435:   }
duke@435:   static int  filtered_fields_count(klassOop klass, bool local_only) {
duke@435:     int nflds = 0;
duke@435:     for (int i=0; i < _filtered_fields->length(); i++) {
duke@435:       if (local_only && klass == _filtered_fields->at(i)->klass()) {
duke@435:         nflds++;
duke@435:       } else if (klass->klass_part()->is_subtype_of(_filtered_fields->at(i)->klass())) {
duke@435:         nflds++;
duke@435:       }
duke@435:     }
duke@435:     return nflds;
duke@435:   }
duke@435:   // GC support.
duke@435:   static void klasses_oops_do(OopClosure* f) {
duke@435:     for (int i = 0; i < _filtered_fields->length(); i++) {
duke@435:       f->do_oop((oop*)_filtered_fields->at(i)->klass_addr());
duke@435:     }
duke@435:   }
duke@435: };
duke@435: 
duke@435: 
duke@435: // A FilteredFieldStream streams over all fields in a class, superclasses and
duke@435: // (super)interfaces. Streaming is done in reverse order (subclasses first,
duke@435: // fields in reverse order)
duke@435: //
duke@435: // Usage:
duke@435: //
duke@435: //    for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) {
duke@435: //      symbolOop field_name = st.name();
duke@435: //      ...
duke@435: //    }
duke@435: 
duke@435: class FilteredFieldStream : public FieldStream {
duke@435:  private:
duke@435:   int  _filtered_fields_count;
duke@435:   bool has_filtered_field() { return (_filtered_fields_count > 0); }
duke@435: 
duke@435:  public:
duke@435:   FilteredFieldStream(instanceKlassHandle klass, bool local_only, bool classes_only)
duke@435:     : FieldStream(klass, local_only, classes_only) {
duke@435:     _filtered_fields_count = FilteredFieldsMap::filtered_fields_count((klassOop)klass(), local_only);
duke@435:   }
duke@435:   int field_count();
duke@435:   void next() {
duke@435:     _index -= instanceKlass::next_offset;
duke@435:     if (has_filtered_field()) {
duke@435:       while (_index >=0 && FilteredFieldsMap::is_filtered_field((klassOop)_klass(), offset())) {
duke@435:         _index -= instanceKlass::next_offset;
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: };