1 /*
2 * Copyright (c) 1999, 2005, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // A KlassStream is an abstract stream for streaming over self, superclasses
26 // and (super)interfaces. Streaming is done in reverse order (subclasses first,
27 // interfaces last).
28 //
29 // for (KlassStream st(k, false, false); !st.eos(); st.next()) {
30 // klassOop k = st.klass();
31 // ...
32 // }
33
34 class KlassStream VALUE_OBJ_CLASS_SPEC {
35 protected:
36 instanceKlassHandle _klass; // current klass/interface iterated over
37 objArrayHandle _interfaces; // transitive interfaces for initial class
38 int _interface_index; // current interface being processed
39 bool _local_only; // process initial class/interface only
40 bool _classes_only; // process classes only (no interfaces)
41 int _index;
42
43 virtual int length() const = 0;
44
45 public:
46 // constructor
47 KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only);
48
49 // testing
50 bool eos();
51
52 // iterating
53 virtual void next() = 0;
54
55 // accessors
56 instanceKlassHandle klass() const { return _klass; }
57 int index() const { return _index; }
58 };
59
60
61 // A MethodStream streams over all methods in a class, superclasses and (super)interfaces.
62 // Streaming is done in reverse order (subclasses first, methods in reverse order)
63 // Usage:
64 //
65 // for (MethodStream st(k, false, false); !st.eos(); st.next()) {
66 // methodOop m = st.method();
67 // ...
68 // }
69
70 class MethodStream : public KlassStream {
71 private:
72 int length() const { return methods()->length(); }
73 objArrayOop methods() const { return _klass->methods(); }
74 public:
75 MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only)
76 : KlassStream(klass, local_only, classes_only) {
77 _index = length();
78 next();
79 }
80
81 void next() { _index--; }
82 methodOop method() const { return methodOop(methods()->obj_at(index())); }
83 };
84
85
86 // A FieldStream streams over all fields in a class, superclasses and (super)interfaces.
87 // Streaming is done in reverse order (subclasses first, fields in reverse order)
88 // Usage:
89 //
90 // for (FieldStream st(k, false, false); !st.eos(); st.next()) {
91 // symbolOop field_name = st.name();
92 // ...
93 // }
94
95
96 class FieldStream : public KlassStream {
97 private:
98 int length() const { return fields()->length(); }
99 constantPoolOop constants() const { return _klass->constants(); }
100 protected:
101 typeArrayOop fields() const { return _klass->fields(); }
102 public:
103 FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only)
104 : KlassStream(klass, local_only, classes_only) {
105 _index = length();
106 next();
107 }
108
109 void next() { _index -= instanceKlass::next_offset; }
110
111 // Accessors for current field
112 AccessFlags access_flags() const {
113 AccessFlags flags;
114 flags.set_flags(fields()->ushort_at(index() + instanceKlass::access_flags_offset));
115 return flags;
116 }
117 symbolOop name() const {
118 int name_index = fields()->ushort_at(index() + instanceKlass::name_index_offset);
119 return constants()->symbol_at(name_index);
120 }
121 symbolOop signature() const {
122 int signature_index = fields()->ushort_at(index() +
123 instanceKlass::signature_index_offset);
124 return constants()->symbol_at(signature_index);
125 }
126 // missing: initval()
127 int offset() const {
128 return _klass->offset_from_fields( index() );
129 }
130 };
131
132 class FilteredField {
133 private:
134 klassOop _klass;
135 int _field_offset;
136
137 public:
138 FilteredField(klassOop klass, int field_offset) {
139 _klass = klass;
140 _field_offset = field_offset;
141 }
142 klassOop klass() { return _klass; }
143 oop* klass_addr() { return (oop*) &_klass; }
144 int field_offset() { return _field_offset; }
145 };
146
147 class FilteredFieldsMap : AllStatic {
148 private:
149 static GrowableArray<FilteredField *> *_filtered_fields;
150 public:
151 static void initialize();
152 static bool is_filtered_field(klassOop klass, int field_offset) {
153 for (int i=0; i < _filtered_fields->length(); i++) {
154 if (klass == _filtered_fields->at(i)->klass() &&
155 field_offset == _filtered_fields->at(i)->field_offset()) {
156 return true;
157 }
158 }
159 return false;
160 }
161 static int filtered_fields_count(klassOop klass, bool local_only) {
162 int nflds = 0;
163 for (int i=0; i < _filtered_fields->length(); i++) {
164 if (local_only && klass == _filtered_fields->at(i)->klass()) {
165 nflds++;
166 } else if (klass->klass_part()->is_subtype_of(_filtered_fields->at(i)->klass())) {
167 nflds++;
168 }
169 }
170 return nflds;
171 }
172 // GC support.
173 static void klasses_oops_do(OopClosure* f) {
174 for (int i = 0; i < _filtered_fields->length(); i++) {
175 f->do_oop((oop*)_filtered_fields->at(i)->klass_addr());
176 }
177 }
178 };
179
180
181 // A FilteredFieldStream streams over all fields in a class, superclasses and
182 // (super)interfaces. Streaming is done in reverse order (subclasses first,
183 // fields in reverse order)
184 //
185 // Usage:
186 //
187 // for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) {
188 // symbolOop field_name = st.name();
189 // ...
190 // }
191
192 class FilteredFieldStream : public FieldStream {
193 private:
194 int _filtered_fields_count;
195 bool has_filtered_field() { return (_filtered_fields_count > 0); }
196
197 public:
198 FilteredFieldStream(instanceKlassHandle klass, bool local_only, bool classes_only)
199 : FieldStream(klass, local_only, classes_only) {
200 _filtered_fields_count = FilteredFieldsMap::filtered_fields_count((klassOop)klass(), local_only);
201 }
202 int field_count();
203 void next() {
204 _index -= instanceKlass::next_offset;
205 if (has_filtered_field()) {
206 while (_index >=0 && FilteredFieldsMap::is_filtered_field((klassOop)_klass(), offset())) {
207 _index -= instanceKlass::next_offset;
208 }
209 }
210 }
211 };