1 /*
2 * Copyright (c) 1999, 2026, 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.
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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 #include "oops/instanceKlass.hpp"
33
34 // ciInstanceKlass
35 //
36 // This class represents a Klass* in the HotSpot virtual machine
37 // whose Klass part is an InstanceKlass. It may or may not
38 // be loaded.
39 class ciInstanceKlass : public ciKlass {
40 CI_PACKAGE_ACCESS
41 friend class ciBytecodeStream;
42 friend class ciEnv;
43 friend class ciExceptionHandler;
44 friend class ciMethod;
45 friend class ciField;
46 friend class ciReplay;
47 friend class CompileTrainingData;
48
49 private:
50 enum SubklassValue { subklass_unknown, subklass_false, subklass_true };
51
52 jobject _loader;
53
54 InstanceKlass::ClassState _init_state; // state of class
55 bool _is_shared;
56 bool _has_finalizer;
57 SubklassValue _has_subklass;
58 bool _has_nonstatic_fields;
59 bool _has_nonstatic_concrete_methods;
60 bool _is_hidden;
61 bool _is_record;
62 bool _trust_final_fields;
63 bool _has_trusted_loader;
64
65 ciFlags _flags;
66
67 // Lazy fields get filled in only upon request.
68 ciInstanceKlass* _super;
69 ciInstance* _java_mirror;
70
71 ciConstantPoolCache* _field_cache; // cached map index->field
72 GrowableArray<ciField*>* _nonstatic_fields; // ordered by JavaFieldStream
73 int _has_injected_fields; // any non static injected fields? lazily initialized.
74
75 // The possible values of the _implementor fall into following three cases:
76 // null: no implementor.
77 // A ciInstanceKlass that's not itself: one implementor.
78 // Itself: more than one implementor.
79 ciInstanceKlass* _implementor;
80 GrowableArray<ciInstanceKlass*>* _transitive_interfaces;
81
82 void compute_injected_fields();
83 bool compute_injected_fields_helper();
84 void compute_transitive_interfaces();
85
86 ciField* get_nonstatic_field_by_offset(int field_offset);
87
88 protected:
89 ciInstanceKlass(Klass* k);
90 ciInstanceKlass(ciSymbol* name, jobject loader);
91
92 InstanceKlass* get_instanceKlass() const {
93 return InstanceKlass::cast(get_Klass());
94 }
95
96 oop loader();
97 jobject loader_handle();
98
99 const char* type_string() { return "ciInstanceKlass"; }
100
101 bool is_in_package_impl(const char* packagename, int len);
102
103 void print_impl(outputStream* st);
104
105 ciConstantPoolCache* field_cache();
106
107 bool is_shared() { return _is_shared; }
108
109 InstanceKlass::ClassState compute_init_state();
110 bool compute_shared_has_subklass();
111 int compute_nonstatic_fields();
112 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
113 bool compute_has_trusted_loader();
114
115 public:
116 // Has this klass been initialized?
117 bool is_initialized() {
118 InstanceKlass::ClassState state = compute_init_state();
119 return state == InstanceKlass::fully_initialized;
120 }
121 bool is_not_initialized() {
122 InstanceKlass::ClassState state = compute_init_state();
123 return state < InstanceKlass::being_initialized;
124 }
125 // Is this klass being initialized?
126 bool is_being_initialized() {
127 InstanceKlass::ClassState state = compute_init_state();
128 return state == InstanceKlass::being_initialized;
129 }
130 // Has this klass been linked?
131 bool is_linked() {
132 InstanceKlass::ClassState state = compute_init_state();
133 return state >= InstanceKlass::linked;
134 }
135 // Is this klass in error state?
136 bool is_in_error_state() {
137 InstanceKlass::ClassState state = compute_init_state();
138 return state == InstanceKlass::initialization_error;
139 }
140
141 // General klass information.
142 ciFlags flags() {
143 assert(is_loaded(), "must be loaded");
144 return _flags;
145 }
146
147 // Fetch Klass::access_flags.
148 jint access_flags() { return flags().as_int(); }
149
150 bool has_finalizer() {
151 assert(is_loaded(), "must be loaded");
152 return _has_finalizer; }
153 bool has_subklass() {
154 assert(is_loaded(), "must be loaded");
155 // Ignore cached subklass_false case.
156 // It could be invalidated by concurrent class loading and
157 // can result in type paradoxes during compilation when
158 // a subclass is observed, but has_subklass() returns false.
159 if (_has_subklass == subklass_true) {
160 return true;
161 }
162 if (flags().is_final()) {
163 return false;
164 }
165 return compute_shared_has_subklass();
166 }
167
168 jint layout_helper_size_in_bytes() {
169 return Klass::layout_helper_size_in_bytes(layout_helper());
170 }
171 jint size_helper() {
172 return (Klass::layout_helper_size_in_bytes(layout_helper())
173 >> LogHeapWordSize);
174 }
175 jint has_nonstatic_fields() {
176 assert(is_loaded(), "must be loaded");
177 return _has_nonstatic_fields; }
178 ciInstanceKlass* super();
179 jint nof_implementors() {
180 ciInstanceKlass* impl;
181 assert(is_loaded(), "must be loaded");
182 impl = implementor();
183 if (impl == nullptr) {
184 return 0;
185 } else if (impl != this) {
186 return 1;
187 } else {
188 return 2;
189 }
190 }
191 bool has_nonstatic_concrete_methods() {
192 assert(is_loaded(), "must be loaded");
193 return _has_nonstatic_concrete_methods;
194 }
195
196 bool is_hidden() const {
197 return _is_hidden;
198 }
199
200 bool is_record() const {
201 return _is_record;
202 }
203
204 bool trust_final_fields() const {
205 return _trust_final_fields;
206 }
207
208 ciInstanceKlass* get_canonical_holder(int offset);
209 ciField* get_field_by_offset(int field_offset, bool is_static);
210 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
211 BasicType get_field_type_by_offset(int field_offset, bool is_static);
212
213 // total number of nonstatic fields (including inherited):
214 int nof_nonstatic_fields() {
215 if (_nonstatic_fields == nullptr)
216 return compute_nonstatic_fields();
217 else
218 return _nonstatic_fields->length();
219 }
220
221 bool has_injected_fields() {
222 if (_has_injected_fields == -1) {
223 compute_injected_fields();
224 }
225 return _has_injected_fields > 0 ? true : false;
226 }
227
228 bool has_object_fields() const;
229
230 // nth nonstatic field (presented by ascending address)
231 ciField* nonstatic_field_at(int i) {
232 assert(_nonstatic_fields != nullptr, "");
233 return _nonstatic_fields->at(i);
234 }
235
236 ciInstanceKlass* unique_concrete_subklass();
237 bool has_finalizable_subclass();
238
239 bool has_class_initializer();
240
241 bool contains_field_offset(int offset);
242
243 // Get the instance of java.lang.Class corresponding to
244 // this klass. This instance is used for locking of
245 // synchronized static methods of this klass.
246 ciInstance* java_mirror();
247
248 // Java access flags
249 bool is_public () { return flags().is_public(); }
250 bool is_final () { return flags().is_final(); }
251 bool is_super () { return flags().is_super(); }
252 bool is_interface () { return flags().is_interface(); }
253 bool is_abstract () { return flags().is_abstract(); }
254
255 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
256 // Note: To find a method from name and type strings, use ciSymbol::make,
257 // but consider adding to vmSymbols.hpp instead.
258
259 bool is_leaf_type();
260 ciInstanceKlass* implementor();
261
262 ciInstanceKlass* unique_implementor() {
263 assert(is_loaded(), "must be loaded");
264 assert(is_interface(), "must be");
265 ciInstanceKlass* impl = implementor();
266 return (impl != this ? impl : nullptr);
267 }
268
269 // Is the defining class loader of this class the default loader?
270 bool uses_default_loader() const;
271
272 bool is_java_lang_Object() const;
273
274 BasicType box_klass_type() const;
275 bool is_box_klass() const;
276 bool is_boxed_value_offset(int offset) const;
277
278 // Is this klass in the given package?
279 bool is_in_package(const char* packagename) {
280 return is_in_package(packagename, (int) strlen(packagename));
281 }
282 bool is_in_package(const char* packagename, int len);
283
284 // What kind of ciObject is this?
285 bool is_instance_klass() const { return true; }
286
287 virtual ciKlass* exact_klass() {
288 if (is_loaded() && is_final() && !is_interface()) {
289 return this;
290 }
291 return nullptr;
292 }
293
294 bool can_be_instantiated() {
295 assert(is_loaded(), "must be loaded");
296 return !is_interface() && !is_abstract();
297 }
298
299 bool has_trusted_loader() const {
300 return _has_trusted_loader;
301 }
302 GrowableArray<ciInstanceKlass*>* transitive_interfaces() const;
303
304 // Replay support
305
306 // Dump the current state of this klass for compilation replay.
307 virtual void dump_replay_data(outputStream* out);
308
309 static void dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik);
310
311
312 // Return stable class name suitable for replay file.
313 const char *replay_name() const;
314
315 #ifdef ASSERT
316 bool debug_final_field_at(int offset);
317 bool debug_stable_field_at(int offset);
318 #endif
319 };
320
321 #endif // SHARE_CI_CIINSTANCEKLASS_HPP