1 /*
2 * Copyright (c) 1999, 2020, 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_CI_CIINSTANCEKLASS_HPP
26 #define SHARE_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 enum SubklassValue { subklass_unknown, subklass_false, subklass_true };
48
49 jobject _loader;
50 jobject _protection_domain;
51
52 InstanceKlass::ClassState _init_state; // state of class
53 bool _is_shared;
54 bool _has_finalizer;
55 SubklassValue _has_subklass;
56 bool _has_nonstatic_fields;
57 bool _has_nonstatic_concrete_methods;
58 bool _is_unsafe_anonymous;
59 bool _is_hidden;
60
61 ciFlags _flags;
62 jint _nonstatic_field_size;
63 jint _nonstatic_oop_map_size;
64
65 // Lazy fields get filled in only upon request.
66 ciInstanceKlass* _super;
67 ciInstance* _java_mirror;
68
69 ciConstantPoolCache* _field_cache; // cached map index->field
70 GrowableArray<ciField*>* _nonstatic_fields;
71 int _has_injected_fields; // any non static injected fields? lazily initialized.
72
73 // The possible values of the _implementor fall into following three cases:
74 // NULL: no implementor.
75 // A ciInstanceKlass that's not itself: one implementor.
76 // Itself: more than one implementor.
77 ciInstanceKlass* _implementor;
78
79 void compute_injected_fields();
80 bool compute_injected_fields_helper();
81
82 protected:
83 ciInstanceKlass(Klass* k);
84 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
85
86 InstanceKlass* get_instanceKlass() const {
87 return InstanceKlass::cast(get_Klass());
88 }
89
90 oop loader();
91 jobject loader_handle();
92
93 oop protection_domain();
94 jobject protection_domain_handle();
95
96 const char* type_string() { return "ciInstanceKlass"; }
97
98 bool is_in_package_impl(const char* packagename, int len);
99
100 void print_impl(outputStream* st);
101
102 ciConstantPoolCache* field_cache();
103
104 bool is_shared() { return _is_shared; }
105
106 void compute_shared_init_state();
107 bool compute_shared_has_subklass();
108 int compute_nonstatic_fields();
109 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
110
111 // Update the init_state for shared klasses
112 void update_if_shared(InstanceKlass::ClassState expected) {
113 if (_is_shared && _init_state != expected) {
114 if (is_loaded()) compute_shared_init_state();
115 }
116 }
117
118 public:
119 // Has this klass been initialized?
120 bool is_initialized() {
121 update_if_shared(InstanceKlass::fully_initialized);
122 return _init_state == InstanceKlass::fully_initialized;
123 }
124 bool is_not_initialized() {
125 update_if_shared(InstanceKlass::fully_initialized);
126 return _init_state < InstanceKlass::being_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 // Is this klass in error state?
139 bool is_in_error_state() {
140 update_if_shared(InstanceKlass::initialization_error);
141 return _init_state == InstanceKlass::initialization_error;
142 }
143
144 // General klass information.
145 ciFlags flags() {
146 assert(is_loaded(), "must be loaded");
147 return _flags;
148 }
149 bool has_finalizer() {
150 assert(is_loaded(), "must be loaded");
151 return _has_finalizer; }
152 bool has_subklass() {
153 assert(is_loaded(), "must be loaded");
154 if (_has_subklass == subklass_unknown ||
155 (_is_shared && _has_subklass == subklass_false)) {
156 if (flags().is_final()) {
157 return false;
158 } else {
159 return compute_shared_has_subklass();
160 }
161 }
162 return _has_subklass == subklass_true;
163 }
164 jint size_helper() {
165 return (Klass::layout_helper_size_in_bytes(layout_helper())
166 >> LogHeapWordSize);
167 }
168 jint nonstatic_field_size() {
169 assert(is_loaded(), "must be loaded");
170 return _nonstatic_field_size; }
171 jint has_nonstatic_fields() {
172 assert(is_loaded(), "must be loaded");
173 return _has_nonstatic_fields; }
174 jint nonstatic_oop_map_size() {
175 assert(is_loaded(), "must be loaded");
176 return _nonstatic_oop_map_size; }
177 ciInstanceKlass* super();
178 jint nof_implementors() {
179 ciInstanceKlass* impl;
180 assert(is_loaded(), "must be loaded");
181 impl = implementor();
182 if (impl == NULL) {
183 return 0;
184 } else if (impl != this) {
185 return 1;
186 } else {
187 return 2;
188 }
189 }
190 bool has_nonstatic_concrete_methods() {
191 assert(is_loaded(), "must be loaded");
192 return _has_nonstatic_concrete_methods;
193 }
194
195 bool is_unsafe_anonymous() {
196 return _is_unsafe_anonymous;
197 }
198
199 bool is_hidden() {
200 return _is_hidden;
201 }
202
203 ciInstanceKlass* get_canonical_holder(int offset);
204 ciField* get_field_by_offset(int field_offset, bool is_static);
205 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
206
207 // total number of nonstatic fields (including inherited):
208 int nof_nonstatic_fields() {
209 if (_nonstatic_fields == NULL)
210 return compute_nonstatic_fields();
211 else
212 return _nonstatic_fields->length();
213 }
214
215 bool has_injected_fields() {
216 if (_has_injected_fields == -1) {
217 compute_injected_fields();
218 }
219 return _has_injected_fields > 0 ? true : false;
220 }
221
222 bool has_object_fields() const;
223
224 // nth nonstatic field (presented by ascending address)
225 ciField* nonstatic_field_at(int i) {
226 assert(_nonstatic_fields != NULL, "");
227 return _nonstatic_fields->at(i);
228 }
229
230 ciInstanceKlass* unique_concrete_subklass();
231 bool has_finalizable_subclass();
232
233 bool contains_field_offset(int offset);
234
235 // Get the instance of java.lang.Class corresponding to
236 // this klass. This instance is used for locking of
237 // synchronized static methods of this klass.
238 ciInstance* java_mirror();
239
240 // Java access flags
241 bool is_public () { return flags().is_public(); }
242 bool is_final () { return flags().is_final(); }
243 bool is_super () { return flags().is_super(); }
244 bool is_interface () { return flags().is_interface(); }
245 bool is_abstract () { return flags().is_abstract(); }
246
247 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
248 // Note: To find a method from name and type strings, use ciSymbol::make,
249 // but consider adding to vmSymbols.hpp instead.
250
251 bool is_leaf_type();
252 ciInstanceKlass* implementor();
253
254 ciInstanceKlass* unique_implementor() {
255 assert(is_loaded(), "must be loaded");
256 ciInstanceKlass* impl = implementor();
257 return (impl != this ? impl : NULL);
258 }
259
260 // Is the defining class loader of this class the default loader?
261 bool uses_default_loader() const;
262
263 bool is_java_lang_Object() const;
264
265 BasicType box_klass_type() const;
266 bool is_box_klass() const;
267 bool is_boxed_value_offset(int offset) const;
268
269 // Is this klass in the given package?
270 bool is_in_package(const char* packagename) {
271 return is_in_package(packagename, (int) strlen(packagename));
272 }
273 bool is_in_package(const char* packagename, int len);
274
275 // What kind of ciObject is this?
276 bool is_instance_klass() const { return true; }
277 bool is_java_klass() const { return true; }
278
279 virtual ciKlass* exact_klass() {
280 if (is_loaded() && is_final() && !is_interface()) {
281 return this;
282 }
283 return NULL;
284 }
285
286 ciInstanceKlass* unsafe_anonymous_host();
287
288 bool can_be_instantiated() {
289 assert(is_loaded(), "must be loaded");
290 return !is_interface() && !is_abstract();
291 }
292
293 // Dump the current state of this klass for compilation replay.
294 virtual void dump_replay_data(outputStream* out);
295
296 #ifdef ASSERT
297 bool debug_final_field_at(int offset);
298 bool debug_stable_field_at(int offset);
299 #endif
300 };
301
302 #endif // SHARE_CI_CIINSTANCEKLASS_HPP