1 /*
2 * Copyright (c) 1999, 2017, 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 #ifndef SHARE_VM_CI_CIINSTANCEKLASS_HPP
26 #define SHARE_VM_CI_CIINSTANCEKLASS_HPP
27
28 #include "ci/ciConstantPoolCache.hpp"
29 #include "ci/ciFlags.hpp"
30 #include "ci/ciKlass.hpp"
31 #include "ci/ciSymbol.hpp"
32
33 // ciInstanceKlass
34 //
35 // This class represents a Klass* in the HotSpot virtual machine
36 // whose Klass part is an InstanceKlass. It may or may not
37 // be loaded.
38 class ciInstanceKlass : public ciKlass {
39 CI_PACKAGE_ACCESS
40 friend class ciBytecodeStream;
41 friend class ciEnv;
42 friend class ciExceptionHandler;
43 friend class ciMethod;
44 friend class ciField;
45
46 private:
47 jobject _holder;
48 jobject _loader;
49 jobject _protection_domain;
50
51 InstanceKlass::ClassState _init_state; // state of class
52 bool _is_shared;
53 bool _has_finalizer;
54 bool _has_subklass;
55 bool _has_nonstatic_fields;
56 bool _has_nonstatic_concrete_methods;
57 bool _is_anonymous;
58
59 ciFlags _flags;
60 jint _nonstatic_field_size;
61 jint _nonstatic_oop_map_size;
62
63 // Lazy fields get filled in only upon request.
64 ciInstanceKlass* _super;
65 ciInstance* _java_mirror;
66
67 ciConstantPoolCache* _field_cache; // cached map index->field
68 GrowableArray<ciField*>* _nonstatic_fields;
69 int _has_injected_fields; // any non static injected fields? lazily initialized.
70
71 // The possible values of the _implementor fall into following three cases:
72 // NULL: no implementor.
73 // A ciInstanceKlass that's not itself: one implementor.
74 // Itsef: more than one implementors.
75 ciInstanceKlass* _implementor;
76
77 void compute_injected_fields();
78 bool compute_injected_fields_helper();
79
80 protected:
81 ciInstanceKlass(Klass* k);
82 ciInstanceKlass(ciSymbol* name, jobject holder, jobject loader, jobject protection_domain);
83
84 InstanceKlass* get_instanceKlass() const {
85 return InstanceKlass::cast(get_Klass());
86 }
87
88 // Hold metadata from unloading by keeping its holder alive.
89 // Though ciInstanceKlass records class loader oop, it's not enough to keep
90 // VM anonymous classes alive (loader == NULL). Klass holder should be used instead.
91 oop holder();
92 jobject holder_handle();
93
94 oop loader();
95 jobject loader_handle();
96
97 oop protection_domain();
98 jobject protection_domain_handle();
99
100 const char* type_string() { return "ciInstanceKlass"; }
101
102 bool is_in_package_impl(const char* packagename, int len);
103
104 void print_impl(outputStream* st);
105
106 ciConstantPoolCache* field_cache();
107
108 bool is_shared() { return _is_shared; }
109
110 void compute_shared_init_state();
111 bool compute_shared_has_subklass();
112 int compute_nonstatic_fields();
113 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
114
115 // Update the init_state for shared klasses
116 void update_if_shared(InstanceKlass::ClassState expected) {
117 if (_is_shared && _init_state != expected) {
118 if (is_loaded()) compute_shared_init_state();
119 }
120 }
121
122 public:
123 // Has this klass been initialized?
124 bool is_initialized() {
125 update_if_shared(InstanceKlass::fully_initialized);
126 return _init_state == InstanceKlass::fully_initialized;
127 }
128 // Is this klass being initialized?
129 bool is_being_initialized() {
130 update_if_shared(InstanceKlass::being_initialized);
131 return _init_state == InstanceKlass::being_initialized;
132 }
133 // Has this klass been linked?
134 bool is_linked() {
135 update_if_shared(InstanceKlass::linked);
136 return _init_state >= InstanceKlass::linked;
137 }
138
139 // General klass information.
140 ciFlags flags() {
141 assert(is_loaded(), "must be loaded");
142 return _flags;
143 }
144 bool has_finalizer() {
145 assert(is_loaded(), "must be loaded");
146 return _has_finalizer; }
147 bool has_subklass() {
148 assert(is_loaded(), "must be loaded");
149 if (_is_shared && !_has_subklass) {
150 if (flags().is_final()) {
151 return false;
152 } else {
153 return compute_shared_has_subklass();
154 }
155 }
156 return _has_subklass;
157 }
158 jint size_helper() {
159 return (Klass::layout_helper_size_in_bytes(layout_helper())
160 >> LogHeapWordSize);
161 }
162 jint nonstatic_field_size() {
163 assert(is_loaded(), "must be loaded");
164 return _nonstatic_field_size; }
165 jint has_nonstatic_fields() {
166 assert(is_loaded(), "must be loaded");
167 return _has_nonstatic_fields; }
168 jint nonstatic_oop_map_size() {
169 assert(is_loaded(), "must be loaded");
170 return _nonstatic_oop_map_size; }
171 ciInstanceKlass* super();
172 jint nof_implementors() {
173 ciInstanceKlass* impl;
174 assert(is_loaded(), "must be loaded");
175 impl = implementor();
176 if (impl == NULL) {
177 return 0;
178 } else if (impl != this) {
179 return 1;
180 } else {
181 return 2;
182 }
183 }
184 bool has_nonstatic_concrete_methods() {
185 assert(is_loaded(), "must be loaded");
186 return _has_nonstatic_concrete_methods;
187 }
188
189 bool is_anonymous() {
190 return _is_anonymous;
191 }
192
193 ciInstanceKlass* get_canonical_holder(int offset);
194 ciField* get_field_by_offset(int field_offset, bool is_static);
195 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
196
197 // total number of nonstatic fields (including inherited):
198 int nof_nonstatic_fields() {
199 if (_nonstatic_fields == NULL)
200 return compute_nonstatic_fields();
201 else
202 return _nonstatic_fields->length();
203 }
204
205 bool has_injected_fields() {
206 if (_has_injected_fields == -1) {
207 compute_injected_fields();
208 }
209 return _has_injected_fields > 0 ? true : false;
210 }
211
212 // nth nonstatic field (presented by ascending address)
213 ciField* nonstatic_field_at(int i) {
214 assert(_nonstatic_fields != NULL, "");
215 return _nonstatic_fields->at(i);
216 }
217
218 ciInstanceKlass* unique_concrete_subklass();
219 bool has_finalizable_subclass();
220
221 bool contains_field_offset(int offset) {
222 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
223 }
224
225 // Get the instance of java.lang.Class corresponding to
226 // this klass. This instance is used for locking of
227 // synchronized static methods of this klass.
228 ciInstance* java_mirror();
229
230 // Java access flags
231 bool is_public () { return flags().is_public(); }
232 bool is_final () { return flags().is_final(); }
233 bool is_super () { return flags().is_super(); }
234 bool is_interface () { return flags().is_interface(); }
235 bool is_abstract () { return flags().is_abstract(); }
236
237 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
238 // Note: To find a method from name and type strings, use ciSymbol::make,
239 // but consider adding to vmSymbols.hpp instead.
240
241 bool is_leaf_type();
242 ciInstanceKlass* implementor();
243
244 // Is the defining class loader of this class the default loader?
245 bool uses_default_loader() const;
246
247 bool is_java_lang_Object() const;
248
249 BasicType box_klass_type() const;
250 bool is_box_klass() const;
251 bool is_boxed_value_offset(int offset) const;
252
253 // Is this klass in the given package?
254 bool is_in_package(const char* packagename) {
255 return is_in_package(packagename, (int) strlen(packagename));
256 }
257 bool is_in_package(const char* packagename, int len);
258
259 // What kind of ciObject is this?
260 bool is_instance_klass() const { return true; }
261 bool is_java_klass() const { return true; }
262
263 virtual ciKlass* exact_klass() {
264 if (is_loaded() && is_final() && !is_interface()) {
265 return this;
266 }
267 return NULL;
268 }
269
270 bool can_be_instantiated() {
271 assert(is_loaded(), "must be loaded");
272 return !is_interface() && !is_abstract();
273 }
274
275 // Dump the current state of this klass for compilation replay.
276 virtual void dump_replay_data(outputStream* out);
277 };
278
279 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP