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