1 /*
2 * Copyright (c) 1999, 2025, 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_non_static_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 void compute_shared_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 // 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 static InstanceKlass::ClassState compute_init_state(InstanceKlass* ik);
123
124 public:
125 // Has this klass been initialized?
126 bool is_initialized() {
127 update_if_shared(InstanceKlass::fully_initialized);
128 return _init_state == InstanceKlass::fully_initialized;
129 }
130 bool is_not_initialized() {
131 update_if_shared(InstanceKlass::fully_initialized);
132 return _init_state < InstanceKlass::being_initialized;
133 }
134 // Is this klass being initialized?
135 bool is_being_initialized() {
136 update_if_shared(InstanceKlass::being_initialized);
137 return _init_state == InstanceKlass::being_initialized;
138 }
139 // Has this klass been linked?
140 bool is_linked() {
141 update_if_shared(InstanceKlass::linked);
142 return _init_state >= InstanceKlass::linked;
143 }
144 // Is this klass in error state?
145 bool is_in_error_state() {
146 update_if_shared(InstanceKlass::initialization_error);
147 return _init_state == InstanceKlass::initialization_error;
148 }
149
150 // General klass information.
151 ciFlags flags() {
152 assert(is_loaded(), "must be loaded");
153 return _flags;
154 }
155
156 // Fetch Klass::access_flags.
157 jint access_flags() { return flags().as_int(); }
158
159 bool has_finalizer() {
160 assert(is_loaded(), "must be loaded");
161 return _has_finalizer; }
162 bool has_subklass() {
163 assert(is_loaded(), "must be loaded");
164 // Ignore cached subklass_false case.
165 // It could be invalidated by concurrent class loading and
166 // can result in type paradoxes during compilation when
167 // a subclass is observed, but has_subklass() returns false.
168 if (_has_subklass == subklass_true) {
169 return true;
170 }
171 if (flags().is_final()) {
172 return false;
173 }
174 return compute_shared_has_subklass();
175 }
176
177 jint layout_helper_size_in_bytes() {
178 return Klass::layout_helper_size_in_bytes(layout_helper());
179 }
180 jint size_helper() {
181 return (Klass::layout_helper_size_in_bytes(layout_helper())
182 >> LogHeapWordSize);
183 }
184 jint has_nonstatic_fields() {
185 assert(is_loaded(), "must be loaded");
186 return _has_nonstatic_fields; }
187 ciInstanceKlass* super();
188 jint nof_implementors() {
189 ciInstanceKlass* impl;
190 assert(is_loaded(), "must be loaded");
191 impl = implementor();
192 if (impl == nullptr) {
193 return 0;
194 } else if (impl != this) {
195 return 1;
196 } else {
197 return 2;
198 }
199 }
200 bool has_nonstatic_concrete_methods() {
201 assert(is_loaded(), "must be loaded");
202 return _has_nonstatic_concrete_methods;
203 }
204
205 bool is_hidden() const {
206 return _is_hidden;
207 }
208
209 bool is_record() const {
210 return _is_record;
211 }
212
213 bool trust_final_fields() const {
214 return _trust_final_fields;
215 }
216
217 ciInstanceKlass* get_canonical_holder(int offset);
218 ciField* get_field_by_offset(int field_offset, bool is_static);
219 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
220 BasicType get_field_type_by_offset(int field_offset, bool is_static);
221
222 // total number of nonstatic fields (including inherited):
223 int nof_nonstatic_fields() {
224 if (_nonstatic_fields == nullptr)
225 return compute_nonstatic_fields();
226 else
227 return _nonstatic_fields->length();
228 }
229
230 bool has_injected_fields() {
231 if (_has_injected_fields == -1) {
232 compute_injected_fields();
233 }
234 return _has_injected_fields > 0 ? true : false;
235 }
236
237 bool has_object_fields() const;
238
239 // nth nonstatic field (presented by ascending address)
240 ciField* nonstatic_field_at(int i) {
241 assert(_nonstatic_fields != nullptr, "");
242 return _nonstatic_fields->at(i);
243 }
244
245 ciInstanceKlass* unique_concrete_subklass();
246 bool has_finalizable_subclass();
247
248 bool has_class_initializer();
249
250 bool contains_field_offset(int offset);
251
252 // Get the instance of java.lang.Class corresponding to
253 // this klass. This instance is used for locking of
254 // synchronized static methods of this klass.
255 ciInstance* java_mirror();
256
257 // Java access flags
258 bool is_public () { return flags().is_public(); }
259 bool is_final () { return flags().is_final(); }
260 bool is_super () { return flags().is_super(); }
261 bool is_interface () { return flags().is_interface(); }
262 bool is_abstract () { return flags().is_abstract(); }
263
264 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
265 // Note: To find a method from name and type strings, use ciSymbol::make,
266 // but consider adding to vmSymbols.hpp instead.
267
268 bool is_leaf_type();
269 ciInstanceKlass* implementor();
270
271 ciInstanceKlass* unique_implementor() {
272 assert(is_loaded(), "must be loaded");
273 assert(is_interface(), "must be");
274 ciInstanceKlass* impl = implementor();
275 return (impl != this ? impl : nullptr);
276 }
277
278 // Is the defining class loader of this class the default loader?
279 bool uses_default_loader() const;
280
281 bool is_java_lang_Object() const;
282
283 BasicType box_klass_type() const;
284 bool is_box_klass() const;
285 bool is_boxed_value_offset(int offset) const;
286
287 // Is this klass in the given package?
288 bool is_in_package(const char* packagename) {
289 return is_in_package(packagename, (int) strlen(packagename));
290 }
291 bool is_in_package(const char* packagename, int len);
292
293 // What kind of ciObject is this?
294 bool is_instance_klass() const { return true; }
295
296 virtual ciKlass* exact_klass() {
297 if (is_loaded() && is_final() && !is_interface()) {
298 return this;
299 }
300 return nullptr;
301 }
302
303 bool can_be_instantiated() {
304 assert(is_loaded(), "must be loaded");
305 return !is_interface() && !is_abstract();
306 }
307
308 bool has_trusted_loader() const {
309 return _has_trusted_loader;
310 }
311 GrowableArray<ciInstanceKlass*>* transitive_interfaces() const;
312
313 // Replay support
314
315 // Dump the current state of this klass for compilation replay.
316 virtual void dump_replay_data(outputStream* out);
317
318 static void dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik);
319
320
321 // Return stable class name suitable for replay file.
322 const char *replay_name() const;
323
324 #ifdef ASSERT
325 bool debug_final_field_at(int offset);
326 bool debug_stable_field_at(int offset);
327 #endif
328 };
329
330 #endif // SHARE_CI_CIINSTANCEKLASS_HPP