1 /*
2 * Copyright (c) 1999, 2018, 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_unsafe_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 _has_injected_fields; // any non static injected fields? lazily initialized.
69
70 // The possible values of the _implementor fall into following three cases:
71 // NULL: no implementor.
72 // A ciInstanceKlass that's not itself: one implementor.
73 // Itsef: more than one implementors.
74 ciInstanceKlass* _implementor;
75
76 void compute_injected_fields();
77 bool compute_injected_fields_helper();
78
79 protected:
80 ciInstanceKlass(Klass* k);
81 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
82
83 InstanceKlass* get_instanceKlass() const {
84 return InstanceKlass::cast(get_Klass());
85 }
86
87 oop loader();
88 jobject loader_handle();
89
90 oop protection_domain();
91 jobject protection_domain_handle();
92
93 const char* type_string() { return "ciInstanceKlass"; }
94
95 bool is_in_package_impl(const char* packagename, int len);
96
97 void print_impl(outputStream* st);
98
99 ciConstantPoolCache* field_cache();
100
101 bool is_shared() { return _is_shared; }
102
103 void compute_shared_init_state();
104 bool compute_shared_has_subklass();
105 int compute_nonstatic_fields();
106 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
107
108 // Update the init_state for shared klasses
109 void update_if_shared(InstanceKlass::ClassState expected) {
110 if (_is_shared && _init_state != expected) {
111 if (is_loaded()) compute_shared_init_state();
112 }
113 }
114
115 public:
116 // Has this klass been initialized?
117 bool is_initialized() {
118 update_if_shared(InstanceKlass::fully_initialized);
119 return _init_state == InstanceKlass::fully_initialized;
120 }
121 // Is this klass being initialized?
122 bool is_being_initialized() {
123 update_if_shared(InstanceKlass::being_initialized);
124 return _init_state == InstanceKlass::being_initialized;
125 }
126 // Has this klass been linked?
127 bool is_linked() {
128 update_if_shared(InstanceKlass::linked);
129 return _init_state >= InstanceKlass::linked;
130 }
131
132 // General klass information.
133 ciFlags flags() {
134 assert(is_loaded(), "must be loaded");
135 return _flags;
136 }
137 bool has_finalizer() {
138 assert(is_loaded(), "must be loaded");
139 return _has_finalizer; }
140 bool has_subklass() {
141 assert(is_loaded(), "must be loaded");
142 if (_is_shared && !_has_subklass) {
143 if (flags().is_final()) {
144 return false;
145 } else {
146 return compute_shared_has_subklass();
147 }
148 }
149 return _has_subklass;
150 }
151 jint size_helper() {
152 return (Klass::layout_helper_size_in_bytes(layout_helper())
153 >> LogHeapWordSize);
154 }
155 jint nonstatic_field_size() {
156 assert(is_loaded(), "must be loaded");
157 return _nonstatic_field_size; }
158 jint has_nonstatic_fields() {
159 assert(is_loaded(), "must be loaded");
160 return _has_nonstatic_fields; }
161 jint nonstatic_oop_map_size() {
162 assert(is_loaded(), "must be loaded");
163 return _nonstatic_oop_map_size; }
164 ciInstanceKlass* super();
165 jint nof_implementors() {
166 ciInstanceKlass* impl;
167 assert(is_loaded(), "must be loaded");
168 impl = implementor();
169 if (impl == NULL) {
170 return 0;
171 } else if (impl != this) {
172 return 1;
173 } else {
174 return 2;
175 }
176 }
177 bool has_nonstatic_concrete_methods() {
178 assert(is_loaded(), "must be loaded");
179 return _has_nonstatic_concrete_methods;
180 }
181
182 bool is_unsafe_anonymous() {
183 return _is_unsafe_anonymous;
184 }
185
186 ciInstanceKlass* get_canonical_holder(int offset);
187 ciField* get_field_by_offset(int field_offset, bool is_static);
188 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
189
190 // total number of nonstatic fields (including inherited):
191 int nof_nonstatic_fields() {
192 if (_nonstatic_fields == NULL)
193 return compute_nonstatic_fields();
194 else
195 return _nonstatic_fields->length();
196 }
197
198 bool has_injected_fields() {
199 if (_has_injected_fields == -1) {
200 compute_injected_fields();
201 }
202 return _has_injected_fields > 0 ? true : false;
203 }
204
205 bool has_object_fields() const;
206
207 // nth nonstatic field (presented by ascending address)
208 ciField* nonstatic_field_at(int i) {
209 assert(_nonstatic_fields != NULL, "");
210 return _nonstatic_fields->at(i);
211 }
212
213 ciInstanceKlass* unique_concrete_subklass();
214 bool has_finalizable_subclass();
215
216 bool contains_field_offset(int offset) {
217 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
218 }
219
220 // Get the instance of java.lang.Class corresponding to
221 // this klass. This instance is used for locking of
222 // synchronized static methods of this klass.
223 ciInstance* java_mirror();
224
225 // Java access flags
226 bool is_public () { return flags().is_public(); }
227 bool is_final () { return flags().is_final(); }
228 bool is_super () { return flags().is_super(); }
229 bool is_interface () { return flags().is_interface(); }
230 bool is_abstract () { return flags().is_abstract(); }
231
232 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
233 // Note: To find a method from name and type strings, use ciSymbol::make,
234 // but consider adding to vmSymbols.hpp instead.
235
236 bool is_leaf_type();
237 ciInstanceKlass* implementor();
238
239 // Is the defining class loader of this class the default loader?
240 bool uses_default_loader() const;
241
242 bool is_java_lang_Object() const;
243
244 BasicType box_klass_type() const;
245 bool is_box_klass() const;
246 bool is_boxed_value_offset(int offset) const;
247
248 // Is this klass in the given package?
249 bool is_in_package(const char* packagename) {
250 return is_in_package(packagename, (int) strlen(packagename));
251 }
252 bool is_in_package(const char* packagename, int len);
253
254 // What kind of ciObject is this?
255 bool is_instance_klass() const { return true; }
256 bool is_java_klass() const { return true; }
257
258 virtual ciKlass* exact_klass() {
259 if (is_loaded() && is_final() && !is_interface()) {
260 return this;
261 }
262 return NULL;
263 }
264
265 ciInstanceKlass* unsafe_anonymous_host();
266
267 bool can_be_instantiated() {
268 assert(is_loaded(), "must be loaded");
269 return !is_interface() && !is_abstract();
270 }
271
272 // Dump the current state of this klass for compilation replay.
273 virtual void dump_replay_data(outputStream* out);
274 };
275
276 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP