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
69 int _has_injected_fields; // any non static injected fields? lazily initialized.
70
71 ciInstanceKlass* _vcc_klass; // points to the value-capable class corresponding to the current derived value type class.
72
73 // The possible values of the _implementor fall into following three cases:
74 // NULL: no implementor.
75 // A ciInstanceKlass that's not itself: one implementor.
76 // Itsef: more than one implementors.
77 ciInstanceKlass* _implementor;
78
79 void compute_injected_fields();
80 bool compute_injected_fields_helper();
81
82 protected:
83 ciInstanceKlass(Klass* k);
84 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
85
86 InstanceKlass* get_instanceKlass() const {
87 return InstanceKlass::cast(get_Klass());
88 }
89
90 oop loader();
91 jobject loader_handle();
92
93 oop protection_domain();
94 jobject protection_domain_handle();
95
96 const char* type_string() { return "ciInstanceKlass"; }
97
98 bool is_in_package_impl(const char* packagename, int len);
99
100 void print_impl(outputStream* st);
101
102 ciConstantPoolCache* field_cache();
103
104 bool is_shared() { return _is_shared; }
105
106 void compute_shared_init_state();
107 bool compute_shared_has_subklass();
108 virtual int compute_nonstatic_fields();
109 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields, bool flatten = true);
110
111 // Update the init_state for shared klasses
112 void update_if_shared(InstanceKlass::ClassState expected) {
113 if (_is_shared && _init_state != expected) {
114 if (is_loaded()) compute_shared_init_state();
115 }
116 }
117
118 public:
119 // Has this klass been initialized?
120 bool is_initialized() {
121 update_if_shared(InstanceKlass::fully_initialized);
122 return _init_state == InstanceKlass::fully_initialized;
123 }
124 // Is this klass being initialized?
125 bool is_being_initialized() {
126 update_if_shared(InstanceKlass::being_initialized);
127 return _init_state == InstanceKlass::being_initialized;
128 }
129 // Has this klass been linked?
130 bool is_linked() {
131 update_if_shared(InstanceKlass::linked);
132 return _init_state >= InstanceKlass::linked;
133 }
134
135 // General klass information.
136 ciFlags flags() {
137 assert(is_loaded(), "must be loaded");
138 return _flags;
139 }
140 bool has_finalizer() {
141 assert(is_loaded(), "must be loaded");
142 return _has_finalizer; }
143 bool has_subklass() {
144 assert(is_loaded(), "must be loaded");
145 if (_is_shared && !_has_subklass) {
146 if (flags().is_final()) {
147 return false;
148 } else {
149 return compute_shared_has_subklass();
150 }
151 }
152 return _has_subklass;
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 // get field descriptor at field_offset ignoring flattening
193 ciField* get_non_flattened_field_by_offset(int field_offset);
194
195 // total number of nonstatic fields (including inherited):
196 int nof_nonstatic_fields() {
197 if (_nonstatic_fields == NULL) {
198 return compute_nonstatic_fields();
199 } else {
200 return _nonstatic_fields->length();
201 }
202 }
203
204 bool has_injected_fields() {
205 if (_has_injected_fields == -1) {
206 compute_injected_fields();
207 }
208 return _has_injected_fields > 0 ? true : false;
209 }
210
211 bool has_object_fields() const;
212
213 // nth nonstatic field (presented by ascending address)
214 ciField* nonstatic_field_at(int i) {
215 assert(_nonstatic_fields != NULL, "");
216 return _nonstatic_fields->at(i);
217 }
218
219 ciInstanceKlass* unique_concrete_subklass();
220 bool has_finalizable_subclass();
221
222 bool contains_field_offset(int offset) {
223 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_valuetype());
224 }
225
226 // Get the instance of java.lang.Class corresponding to
227 // this klass. This instance is used for locking of
228 // synchronized static methods of this klass.
229 ciInstance* java_mirror();
230
231 // Java access flags
232 bool is_public () { return flags().is_public(); }
233 bool is_final () { return flags().is_final(); }
234 bool is_super () { return flags().is_super(); }
235 bool is_interface () { return flags().is_interface(); }
236 bool is_abstract () { return flags().is_abstract(); }
237
238 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
239 // Note: To find a method from name and type strings, use ciSymbol::make,
240 // but consider adding to vmSymbols.hpp instead.
241
242 bool is_leaf_type();
243 ciInstanceKlass* implementor();
244 ciInstanceKlass* vcc_klass();
245
246 // Is the defining class loader of this class the default loader?
247 bool uses_default_loader() const;
248
249 bool is_java_lang_Object() const;
250
251 BasicType box_klass_type() const;
252 bool is_box_klass() const;
253 bool is_boxed_value_offset(int offset) const;
254
255 // Is this klass in the given package?
256 bool is_in_package(const char* packagename) {
257 return is_in_package(packagename, (int) strlen(packagename));
258 }
259 bool is_in_package(const char* packagename, int len);
260
261 // What kind of ciObject is this?
262 bool is_instance_klass() const { return true; }
263 bool is_java_klass() const { return true; }
264
265 virtual ciKlass* exact_klass() {
266 if (is_loaded() && is_final() && !is_interface()) {
267 return this;
268 }
269 return NULL;
270 }
271
272 ciInstanceKlass* unsafe_anonymous_host();
273
274 bool can_be_instantiated() {
275 assert(is_loaded(), "must be loaded");
276 return !is_interface() && !is_abstract();
277 }
278
279 // Dump the current state of this klass for compilation replay.
280 virtual void dump_replay_data(outputStream* out);
281 };
282
283 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP