1 /*
2 * Copyright (c) 1999, 2013, 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_default_methods;
56
57 ciFlags _flags;
58 jint _nonstatic_field_size;
59 jint _nonstatic_oop_map_size;
60
61 // Lazy fields get filled in only upon request.
62 ciInstanceKlass* _super;
63 ciInstance* _java_mirror;
64
65 ciConstantPoolCache* _field_cache; // cached map index->field
66 GrowableArray<ciField*>* _nonstatic_fields;
67 int _has_injected_fields; // any non static injected fields? lazily initialized.
68
69 // The possible values of the _implementor fall into following three cases:
70 // NULL: no implementor.
71 // A ciInstanceKlass that's not itself: one implementor.
72 // Itsef: more than one implementors.
73 ciInstanceKlass* _implementor;
74
75 bool compute_injected_fields();
76 void compute_injected_fields_helper();
77
78 protected:
79 ciInstanceKlass(KlassHandle h_k);
80 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
81
82 InstanceKlass* get_instanceKlass() const {
83 return (InstanceKlass*)get_Klass();
84 }
85
86 oop loader();
87 jobject loader_handle();
88
89 oop protection_domain();
90 jobject protection_domain_handle();
91
92 const char* type_string() { return "ciInstanceKlass"; }
93
94 bool is_in_package_impl(const char* packagename, int len);
95
96 void print_impl(outputStream* st);
97
98 ciConstantPoolCache* field_cache();
99
100 bool is_shared() { return _is_shared; }
101
102 void compute_shared_init_state();
103 bool compute_shared_has_subklass();
104 int compute_nonstatic_fields();
105 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
106
107 // Update the init_state for shared klasses
108 void update_if_shared(InstanceKlass::ClassState expected) {
109 if (_is_shared && _init_state != expected) {
110 if (is_loaded()) compute_shared_init_state();
111 }
112 }
113
114 public:
115 // Has this klass been initialized?
116 bool is_initialized() {
117 update_if_shared(InstanceKlass::fully_initialized);
118 return _init_state == InstanceKlass::fully_initialized;
119 }
120 // Is this klass being initialized?
121 bool is_being_initialized() {
122 update_if_shared(InstanceKlass::being_initialized);
123 return _init_state == InstanceKlass::being_initialized;
124 }
125 // Has this klass been linked?
126 bool is_linked() {
127 update_if_shared(InstanceKlass::linked);
128 return _init_state >= InstanceKlass::linked;
129 }
130
131 // General klass information.
132 ciFlags flags() {
133 assert(is_loaded(), "must be loaded");
134 return _flags;
135 }
136 bool has_finalizer() {
137 assert(is_loaded(), "must be loaded");
138 return _has_finalizer; }
139 bool has_subklass() {
140 assert(is_loaded(), "must be loaded");
141 if (_is_shared && !_has_subklass) {
142 if (flags().is_final()) {
143 return false;
144 } else {
145 return compute_shared_has_subklass();
146 }
147 }
148 return _has_subklass;
149 }
150 jint size_helper() {
151 return (Klass::layout_helper_size_in_bytes(layout_helper())
152 >> LogHeapWordSize);
153 }
154 jint nonstatic_field_size() {
155 assert(is_loaded(), "must be loaded");
156 return _nonstatic_field_size; }
157 jint has_nonstatic_fields() {
158 assert(is_loaded(), "must be loaded");
159 return _has_nonstatic_fields; }
160 jint nonstatic_oop_map_size() {
161 assert(is_loaded(), "must be loaded");
162 return _nonstatic_oop_map_size; }
163 ciInstanceKlass* super();
164 jint nof_implementors() {
165 ciInstanceKlass* impl;
166 assert(is_loaded(), "must be loaded");
167 impl = implementor();
168 if (impl == NULL) {
169 return 0;
170 } else if (impl != this) {
171 return 1;
172 } else {
173 return 2;
174 }
175 }
176
177 bool has_default_methods() {
178 assert(is_loaded(), "must be loaded");
179 return _has_default_methods;
180 }
181
182 ciInstanceKlass* get_canonical_holder(int offset);
183 ciField* get_field_by_offset(int field_offset, bool is_static);
184 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
185
186 // total number of nonstatic fields (including inherited):
187 int nof_nonstatic_fields() {
188 if (_nonstatic_fields == NULL)
189 return compute_nonstatic_fields();
190 else
191 return _nonstatic_fields->length();
192 }
193
194 bool has_injected_fields() {
195 if (_has_injected_fields == -1) {
196 return compute_injected_fields();
197 }
198 return _has_injected_fields > 0 ? true : false;
199 }
200
201 // nth nonstatic field (presented by ascending address)
202 ciField* nonstatic_field_at(int i) {
203 assert(_nonstatic_fields != NULL, "");
204 return _nonstatic_fields->at(i);
205 }
206
207 ciInstanceKlass* unique_concrete_subklass();
208 bool has_finalizable_subclass();
209
210 bool contains_field_offset(int offset) {
211 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
212 }
213
214 // Get the instance of java.lang.Class corresponding to
215 // this klass. This instance is used for locking of
216 // synchronized static methods of this klass.
217 ciInstance* java_mirror();
218
219 // Java access flags
220 bool is_public () { return flags().is_public(); }
221 bool is_final () { return flags().is_final(); }
222 bool is_super () { return flags().is_super(); }
223 bool is_interface () { return flags().is_interface(); }
224 bool is_abstract () { return flags().is_abstract(); }
225
226 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
227 // Note: To find a method from name and type strings, use ciSymbol::make,
228 // but consider adding to vmSymbols.hpp instead.
229
230 bool is_leaf_type();
231 ciInstanceKlass* implementor();
232
233 // Is the defining class loader of this class the default loader?
234 bool uses_default_loader() const;
235
236 bool is_java_lang_Object() const;
237
238 BasicType box_klass_type() const;
239 bool is_box_klass() const;
240 bool is_boxed_value_offset(int offset) const;
241
242 // Is this klass in the given package?
243 bool is_in_package(const char* packagename) {
244 return is_in_package(packagename, (int) strlen(packagename));
245 }
246 bool is_in_package(const char* packagename, int len);
247
248 // What kind of ciObject is this?
249 bool is_instance_klass() const { return true; }
250 bool is_java_klass() const { return true; }
251
252 virtual ciKlass* exact_klass() {
253 if (is_loaded() && is_final() && !is_interface()) {
254 return this;
255 }
256 return NULL;
257 }
258
259 // Dump the current state of this klass for compilation replay.
260 virtual void dump_replay_data(outputStream* out);
261 };
262
263 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP