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 GrowableArray<ciField*>* _non_static_fields;
75
76 protected:
77 ciInstanceKlass(KlassHandle h_k);
78 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
79
80 InstanceKlass* get_instanceKlass() const {
81 return (InstanceKlass*)get_Klass();
82 }
83
84 oop loader();
85 jobject loader_handle();
86
87 oop protection_domain();
88 jobject protection_domain_handle();
89
90 const char* type_string() { return "ciInstanceKlass"; }
91
92 bool is_in_package_impl(const char* packagename, int len);
93
94 void print_impl(outputStream* st);
95
96 ciConstantPoolCache* field_cache();
97
98 bool is_shared() { return _is_shared; }
99
100 void compute_shared_init_state();
101 bool compute_shared_has_subklass();
102 int compute_nonstatic_fields();
103 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
104
105 // Update the init_state for shared klasses
106 void update_if_shared(InstanceKlass::ClassState expected) {
107 if (_is_shared && _init_state != expected) {
108 if (is_loaded()) compute_shared_init_state();
109 }
110 }
111
112 public:
113 // Has this klass been initialized?
114 bool is_initialized() {
115 update_if_shared(InstanceKlass::fully_initialized);
116 return _init_state == InstanceKlass::fully_initialized;
117 }
118 // Is this klass being initialized?
119 bool is_being_initialized() {
120 update_if_shared(InstanceKlass::being_initialized);
121 return _init_state == InstanceKlass::being_initialized;
122 }
123 // Has this klass been linked?
124 bool is_linked() {
125 update_if_shared(InstanceKlass::linked);
126 return _init_state >= InstanceKlass::linked;
127 }
128
129 // General klass information.
130 ciFlags flags() {
131 assert(is_loaded(), "must be loaded");
132 return _flags;
133 }
134 bool has_finalizer() {
135 assert(is_loaded(), "must be loaded");
136 return _has_finalizer; }
137 bool has_subklass() {
138 assert(is_loaded(), "must be loaded");
139 if (_is_shared && !_has_subklass) {
140 if (flags().is_final()) {
141 return false;
142 } else {
143 return compute_shared_has_subklass();
144 }
145 }
146 return _has_subklass;
147 }
148 jint size_helper() {
149 return (Klass::layout_helper_size_in_bytes(layout_helper())
150 >> LogHeapWordSize);
151 }
152 jint nonstatic_field_size() {
153 assert(is_loaded(), "must be loaded");
154 return _nonstatic_field_size; }
155 jint has_nonstatic_fields() {
156 assert(is_loaded(), "must be loaded");
157 return _has_nonstatic_fields; }
158 jint nonstatic_oop_map_size() {
159 assert(is_loaded(), "must be loaded");
160 return _nonstatic_oop_map_size; }
161 ciInstanceKlass* super();
162 jint nof_implementors() {
163 ciInstanceKlass* impl;
164 assert(is_loaded(), "must be loaded");
165 impl = implementor();
166 if (impl == NULL) {
167 return 0;
168 } else if (impl != this) {
169 return 1;
170 } else {
171 return 2;
172 }
173 }
174
175 bool has_default_methods() {
176 assert(is_loaded(), "must be loaded");
177 return _has_default_methods;
178 }
179
180 ciInstanceKlass* get_canonical_holder(int offset);
181 ciField* get_field_by_offset(int field_offset, bool is_static);
182 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
183
184 GrowableArray<ciField*>* non_static_fields();
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 // nth nonstatic field (presented by ascending address)
194 ciField* nonstatic_field_at(int i) {
195 assert(_nonstatic_fields != NULL, "");
196 return _nonstatic_fields->at(i);
197 }
198
199 ciInstanceKlass* unique_concrete_subklass();
200 bool has_finalizable_subclass();
201
202 bool contains_field_offset(int offset) {
203 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
204 }
205
206 // Get the instance of java.lang.Class corresponding to
207 // this klass. This instance is used for locking of
208 // synchronized static methods of this klass.
209 ciInstance* java_mirror();
210
211 // Java access flags
212 bool is_public () { return flags().is_public(); }
213 bool is_final () { return flags().is_final(); }
214 bool is_super () { return flags().is_super(); }
215 bool is_interface () { return flags().is_interface(); }
216 bool is_abstract () { return flags().is_abstract(); }
217
218 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
219 // Note: To find a method from name and type strings, use ciSymbol::make,
220 // but consider adding to vmSymbols.hpp instead.
221
222 bool is_leaf_type();
223 ciInstanceKlass* implementor();
224
225 // Is the defining class loader of this class the default loader?
226 bool uses_default_loader() const;
227
228 bool is_java_lang_Object() const;
229
230 BasicType box_klass_type() const;
231 bool is_box_klass() const;
232 bool is_boxed_value_offset(int offset) const;
233
234 // Is this klass in the given package?
235 bool is_in_package(const char* packagename) {
236 return is_in_package(packagename, (int) strlen(packagename));
237 }
238 bool is_in_package(const char* packagename, int len);
239
240 // What kind of ciObject is this?
241 bool is_instance_klass() const { return true; }
242 bool is_java_klass() const { return true; }
243
244 virtual ciKlass* exact_klass() {
245 if (is_loaded() && is_final() && !is_interface()) {
246 return this;
247 }
248 return NULL;
249 }
250
251 // Dump the current state of this klass for compilation replay.
252 virtual void dump_replay_data(outputStream* out);
253 };
254
255 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP