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 _loader;
48 jobject _protection_domain;
49
50 InstanceKlass::ClassState _init_state; // state of class
51 bool _is_shared;
52 bool _has_finalizer;
53 bool _has_subklass;
54 bool _has_nonstatic_fields;
55 bool _has_nonstatic_concrete_methods;
56 bool _is_anonymous;
57
58 ciFlags _flags;
59 jint _nonstatic_field_size;
60 jint _nonstatic_oop_map_size;
61
62 // Lazy fields get filled in only upon request.
63 ciInstanceKlass* _super;
64 ciInstance* _java_mirror;
65
66 ciConstantPoolCache* _field_cache; // cached map index->field
67 GrowableArray<ciField*>* _nonstatic_fields;
68 int _nof_declared_nonstatic_fields; // Number of nonstatic fields declared in the bytecode
69 // i.e., without value types flattened into the instance.
70
71 int _has_injected_fields; // any non static injected fields? lazily initialized.
72
73 ciInstanceKlass* _vcc_klass; // points to the value-capable class corresponding to the current derived value type class.
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 // Itsef: more than one implementors.
79 ciInstanceKlass* _implementor;
80
81 void compute_injected_fields();
82 bool compute_injected_fields_helper();
83
84 protected:
85 ciInstanceKlass(Klass* k);
86 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
87
88 InstanceKlass* get_instanceKlass() const {
89 return InstanceKlass::cast(get_Klass());
90 }
91
92 oop loader();
93 jobject loader_handle();
94
95 oop protection_domain();
96 jobject protection_domain_handle();
97
98 const char* type_string() { return "ciInstanceKlass"; }
99
100 bool is_in_package_impl(const char* packagename, int len);
101
102 void print_impl(outputStream* st);
103
104 ciConstantPoolCache* field_cache();
105
106 bool is_shared() { return _is_shared; }
107
108 void compute_shared_init_state();
109 bool compute_shared_has_subklass();
110 int compute_nonstatic_fields();
111 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
112
113 // Update the init_state for shared klasses
114 void update_if_shared(InstanceKlass::ClassState expected) {
115 if (_is_shared && _init_state != expected) {
116 if (is_loaded()) compute_shared_init_state();
117 }
118 }
119
120 public:
121 // Has this klass been initialized?
122 bool is_initialized() {
123 update_if_shared(InstanceKlass::fully_initialized);
124 return _init_state == InstanceKlass::fully_initialized;
125 }
126 // Is this klass being initialized?
127 bool is_being_initialized() {
128 update_if_shared(InstanceKlass::being_initialized);
129 return _init_state == InstanceKlass::being_initialized;
130 }
131 // Has this klass been linked?
132 bool is_linked() {
133 update_if_shared(InstanceKlass::linked);
134 return _init_state >= InstanceKlass::linked;
135 }
136
137 // General klass information.
138 ciFlags flags() {
139 assert(is_loaded(), "must be loaded");
140 return _flags;
141 }
142 bool has_finalizer() {
143 assert(is_loaded(), "must be loaded");
144 return _has_finalizer; }
145 bool has_subklass() {
146 assert(is_loaded(), "must be loaded");
147 if (_is_shared && !_has_subklass) {
148 if (flags().is_final()) {
149 return false;
150 } else {
151 return compute_shared_has_subklass();
152 }
153 }
154 return _has_subklass;
155 }
156 jint size_helper() {
157 return (Klass::layout_helper_size_in_bytes(layout_helper())
158 >> LogHeapWordSize);
159 }
160 jint nonstatic_field_size() {
161 assert(is_loaded(), "must be loaded");
162 return _nonstatic_field_size; }
163 jint has_nonstatic_fields() {
164 assert(is_loaded(), "must be loaded");
165 return _has_nonstatic_fields; }
166 jint nonstatic_oop_map_size() {
167 assert(is_loaded(), "must be loaded");
168 return _nonstatic_oop_map_size; }
169 ciInstanceKlass* super();
170 jint nof_implementors() {
171 ciInstanceKlass* impl;
172 assert(is_loaded(), "must be loaded");
173 impl = implementor();
174 if (impl == NULL) {
175 return 0;
176 } else if (impl != this) {
177 return 1;
178 } else {
179 return 2;
180 }
181 }
182 bool has_nonstatic_concrete_methods() {
183 assert(is_loaded(), "must be loaded");
184 return _has_nonstatic_concrete_methods;
185 }
186
187 bool is_anonymous() {
188 return _is_anonymous;
189 }
190
191 ciInstanceKlass* get_canonical_holder(int offset);
192 ciField* get_field_by_offset(int field_offset, bool is_static);
193 ciType* get_field_type_by_offset(int field_offset);
194 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
195
196 // total number of nonstatic fields (including inherited):
197 int nof_nonstatic_fields() {
198 if (_nonstatic_fields == NULL)
199 return compute_nonstatic_fields();
200 else
201 return _nonstatic_fields->length();
202 }
203
204 int nof_declared_nonstatic_fields() {
205 if (_nonstatic_fields == NULL) {
206 compute_nonstatic_fields();
207 }
208 assert(_nof_declared_nonstatic_fields >= 0, "after lazy initialization _nof_declared_nonstatic_fields must be at least 0");
209 return _nof_declared_nonstatic_fields;
210 }
211
212 bool has_injected_fields() {
213 if (_has_injected_fields == -1) {
214 compute_injected_fields();
215 }
216 return _has_injected_fields > 0 ? true : false;
217 }
218
219 // nth nonstatic field (presented by ascending address)
220 ciField* nonstatic_field_at(int i) {
221 assert(_nonstatic_fields != NULL, "");
222 return _nonstatic_fields->at(i);
223 }
224
225 ciInstanceKlass* unique_concrete_subklass();
226 bool has_finalizable_subclass();
227
228 bool contains_field_offset(int offset) {
229 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_valuetype());
230 }
231
232 // Get the instance of java.lang.Class corresponding to
233 // this klass. This instance is used for locking of
234 // synchronized static methods of this klass.
235 ciInstance* java_mirror();
236
237 // Java access flags
238 bool is_public () { return flags().is_public(); }
239 bool is_final () { return flags().is_final(); }
240 bool is_super () { return flags().is_super(); }
241 bool is_interface () { return flags().is_interface(); }
242 bool is_abstract () { return flags().is_abstract(); }
243
244 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
245 // Note: To find a method from name and type strings, use ciSymbol::make,
246 // but consider adding to vmSymbols.hpp instead.
247
248 bool is_leaf_type();
249 ciInstanceKlass* implementor();
250 ciInstanceKlass* vcc_klass();
251
252 // Is the defining class loader of this class the default loader?
253 bool uses_default_loader() const;
254
255 bool is_java_lang_Object() const;
256
257 BasicType box_klass_type() const;
258 bool is_box_klass() const;
259 bool is_boxed_value_offset(int offset) const;
260
261 // Is this klass in the given package?
262 bool is_in_package(const char* packagename) {
263 return is_in_package(packagename, (int) strlen(packagename));
264 }
265 bool is_in_package(const char* packagename, int len);
266
267 // What kind of ciObject is this?
268 bool is_instance_klass() const { return true; }
269 bool is_java_klass() const { return true; }
270
271 virtual ciKlass* exact_klass() {
272 if (is_loaded() && is_final() && !is_interface()) {
273 return this;
274 }
275 return NULL;
276 }
277
278 ciInstanceKlass* host_klass();
279
280 bool can_be_instantiated() {
281 assert(is_loaded(), "must be loaded");
282 return !is_interface() && !is_abstract();
283 }
284
285 // Dump the current state of this klass for compilation replay.
286 virtual void dump_replay_data(outputStream* out);
287 };
288
289 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP