1 /*
2 * Copyright (c) 1999, 2019, 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
60 ciFlags _flags;
61 jint _nonstatic_field_size;
62 jint _nonstatic_oop_map_size;
63
64 // Lazy fields get filled in only upon request.
65 ciInstanceKlass* _super;
66 ciInstance* _java_mirror;
67
68 ciConstantPoolCache* _field_cache; // cached map index->field
69 GrowableArray<ciField*>* _nonstatic_fields;
70 int _has_injected_fields; // any non static injected fields? lazily initialized.
71
72 // The possible values of the _implementor fall into following three cases:
73 // NULL: no implementor.
74 // A ciInstanceKlass that's not itself: one implementor.
75 // Itsef: more than one implementors.
76 ciInstanceKlass* _implementor;
77
78 void compute_injected_fields();
79 bool compute_injected_fields_helper();
80
81 protected:
82 ciInstanceKlass(Klass* k);
83 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
84
85 InstanceKlass* get_instanceKlass() const {
86 return InstanceKlass::cast(get_Klass());
87 }
88
89 oop loader();
90 jobject loader_handle();
91
92 oop protection_domain();
93 jobject protection_domain_handle();
94
95 const char* type_string() { return "ciInstanceKlass"; }
96
97 bool is_in_package_impl(const char* packagename, int len);
98
99 void print_impl(outputStream* st);
100
101 ciConstantPoolCache* field_cache();
102
103 bool is_shared() { return _is_shared; }
104
105 void compute_shared_init_state();
106 bool compute_shared_has_subklass();
107 int compute_nonstatic_fields();
108 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
109
110 // Update the init_state for shared klasses
111 void update_if_shared(InstanceKlass::ClassState expected) {
112 if (_is_shared && _init_state != expected) {
113 if (is_loaded()) compute_shared_init_state();
114 }
115 }
116
117 public:
118 // Has this klass been initialized?
119 bool is_initialized() {
120 update_if_shared(InstanceKlass::fully_initialized);
121 return _init_state == InstanceKlass::fully_initialized;
122 }
123 // Is this klass being initialized?
124 bool is_being_initialized() {
125 update_if_shared(InstanceKlass::being_initialized);
126 return _init_state == InstanceKlass::being_initialized;
127 }
128 // Has this klass been linked?
129 bool is_linked() {
130 update_if_shared(InstanceKlass::linked);
131 return _init_state >= InstanceKlass::linked;
132 }
133
134 // General klass information.
135 ciFlags flags() {
136 assert(is_loaded(), "must be loaded");
137 return _flags;
138 }
139 bool has_finalizer() {
140 assert(is_loaded(), "must be loaded");
141 return _has_finalizer; }
142 bool has_subklass() {
143 assert(is_loaded(), "must be loaded");
144 if (_has_subklass == subklass_unknown ||
145 (_is_shared && _has_subklass == subklass_false)) {
146 if (flags().is_final()) {
147 return false;
148 } else {
149 return compute_shared_has_subklass();
150 }
151 }
152 return _has_subklass == subklass_true;
153 }
154 jint size_helper() {
155 return (Klass::layout_helper_size_in_bytes(layout_helper())
156 >> LogHeapWordSize);
157 }
158 jint nonstatic_field_size() {
159 assert(is_loaded(), "must be loaded");
160 return _nonstatic_field_size; }
161 jint has_nonstatic_fields() {
162 assert(is_loaded(), "must be loaded");
163 return _has_nonstatic_fields; }
164 jint nonstatic_oop_map_size() {
165 assert(is_loaded(), "must be loaded");
166 return _nonstatic_oop_map_size; }
167 ciInstanceKlass* super();
168 jint nof_implementors() {
169 ciInstanceKlass* impl;
170 assert(is_loaded(), "must be loaded");
171 impl = implementor();
172 if (impl == NULL) {
173 return 0;
174 } else if (impl != this) {
175 return 1;
176 } else {
177 return 2;
178 }
179 }
180 bool has_nonstatic_concrete_methods() {
181 assert(is_loaded(), "must be loaded");
182 return _has_nonstatic_concrete_methods;
183 }
184
185 bool is_unsafe_anonymous() {
186 return _is_unsafe_anonymous;
187 }
188
189 ciInstanceKlass* get_canonical_holder(int offset);
190 ciField* get_field_by_offset(int field_offset, bool is_static);
191 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
192
193 // total number of nonstatic fields (including inherited):
194 int nof_nonstatic_fields() {
195 if (_nonstatic_fields == NULL)
196 return compute_nonstatic_fields();
197 else
198 return _nonstatic_fields->length();
199 }
200
201 bool has_injected_fields() {
202 if (_has_injected_fields == -1) {
203 compute_injected_fields();
204 }
205 return _has_injected_fields > 0 ? true : false;
206 }
207
208 bool has_object_fields() const;
209
210 // nth nonstatic field (presented by ascending address)
211 ciField* nonstatic_field_at(int i) {
212 assert(_nonstatic_fields != NULL, "");
213 return _nonstatic_fields->at(i);
214 }
215
216 ciInstanceKlass* unique_concrete_subklass();
217 bool has_finalizable_subclass();
218
219 bool contains_field_offset(int offset) {
220 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
221 }
222
223 // Get the instance of java.lang.Class corresponding to
224 // this klass. This instance is used for locking of
225 // synchronized static methods of this klass.
226 ciInstance* java_mirror();
227
228 // Java access flags
229 bool is_public () { return flags().is_public(); }
230 bool is_final () { return flags().is_final(); }
231 bool is_super () { return flags().is_super(); }
232 bool is_interface () { return flags().is_interface(); }
233 bool is_abstract () { return flags().is_abstract(); }
234
235 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
236 // Note: To find a method from name and type strings, use ciSymbol::make,
237 // but consider adding to vmSymbols.hpp instead.
238
239 bool is_leaf_type();
240 ciInstanceKlass* implementor();
241
242 // Is the defining class loader of this class the default loader?
243 bool uses_default_loader() const;
244
245 bool is_java_lang_Object() const;
246
247 BasicType box_klass_type() const;
248 bool is_box_klass() const;
249 bool is_boxed_value_offset(int offset) const;
250
251 // Is this klass in the given package?
252 bool is_in_package(const char* packagename) {
253 return is_in_package(packagename, (int) strlen(packagename));
254 }
255 bool is_in_package(const char* packagename, int len);
256
257 // What kind of ciObject is this?
258 bool is_instance_klass() const { return true; }
259 bool is_java_klass() const { return true; }
260
261 virtual ciKlass* exact_klass() {
262 if (is_loaded() && is_final() && !is_interface()) {
263 return this;
264 }
265 return NULL;
266 }
267
268 ciInstanceKlass* unsafe_anonymous_host();
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 #ifdef ASSERT
279 bool debug_final_field_at(int offset);
280 bool debug_stable_field_at(int offset);
281 #endif
282 };
283
284 #endif // SHARE_CI_CIINSTANCEKLASS_HPP