1 /*
2 * Copyright (c) 1999, 2010, 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/ciInstanceKlassKlass.hpp"
31 #include "ci/ciKlass.hpp"
32 #include "ci/ciSymbol.hpp"
33
34 // ciInstanceKlass
35 //
36 // This class represents a klassOop in the HotSpot virtual machine
37 // whose Klass part is an instanceKlass. It may or may not
38 // be loaded.
39 class ciInstanceKlass : public ciKlass {
40 CI_PACKAGE_ACCESS
41 friend class ciBytecodeStream;
42 friend class ciEnv;
43 friend class ciExceptionHandler;
44 friend class ciMethod;
45 friend class ciField;
46
47 private:
48 jobject _loader;
49 jobject _protection_domain;
50
51 instanceKlass::ClassState _init_state; // state of class
52 bool _is_shared;
53 bool _has_finalizer;
54 bool _has_subklass;
55 bool _has_nonstatic_fields;
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 GrowableArray<ciField*>* _static_fields;
68
69 enum { implementors_limit = instanceKlass::implementors_limit };
70 ciInstanceKlass* _implementors[implementors_limit];
71 jint _nof_implementors;
72
73 protected:
74 ciInstanceKlass(KlassHandle h_k);
75 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
76
77 instanceKlass* get_instanceKlass() const {
78 return (instanceKlass*)get_Klass();
79 }
80
81 oop loader();
82 jobject loader_handle();
83
84 oop protection_domain();
85 jobject protection_domain_handle();
86
87 const char* type_string() { return "ciInstanceKlass"; }
88
89 bool is_in_package_impl(const char* packagename, int len);
90
91 void print_impl(outputStream* st);
92
93 ciConstantPoolCache* field_cache();
94
95 bool is_shared() { return _is_shared; }
96
97 void compute_shared_init_state();
98 bool compute_shared_has_subklass();
99 int compute_shared_nof_implementors();
100 int compute_fields();
101 void compute_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 has_nonstatic_fields() {
151 assert(is_loaded(), "must be loaded");
152 return _has_nonstatic_fields; }
153 ciInstanceKlass* super();
154 jint nof_implementors() {
155 assert(is_loaded(), "must be loaded");
156 if (_is_shared) return compute_shared_nof_implementors();
157 return _nof_implementors;
158 }
159
160 ciInstanceKlass* get_canonical_holder(int offset);
161 ciField* get_field_by_offset(int field_offset, bool is_static);
162 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
163
164 // All nonstatic fields, including inherited ones
165 GrowableArray<ciField*>* nonstatic_fields() {
166 if (_nonstatic_fields == NULL) {
167 compute_fields();
168 }
169 return _nonstatic_fields;
170 }
171 // Static fields declared in this class
172 GrowableArray<ciField*>* static_fields() {
173 if (_static_fields == NULL) {
174 compute_fields();
175 }
176 return _static_fields;
177 }
178
179 ciInstanceKlass* unique_concrete_subklass();
180 bool has_finalizable_subclass();
181
182 bool contains_field_offset(int offset) {
183 return instanceOopDesc::contains_field_offset(offset, _nonstatic_field_size);
184 }
185
186 // Get the instance of java.lang.Class corresponding to
187 // this klass. This instance is used for locking of
188 // synchronized static methods of this klass.
189 ciInstance* java_mirror();
190
191 // Java access flags
192 bool is_public () { return flags().is_public(); }
193 bool is_final () { return flags().is_final(); }
194 bool is_super () { return flags().is_super(); }
195 bool is_interface () { return flags().is_interface(); }
196 bool is_abstract () { return flags().is_abstract(); }
197
198 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
199 // Note: To find a method from name and type strings, use ciSymbol::make,
200 // but consider adding to vmSymbols.hpp instead.
201
202 bool is_leaf_type();
203 ciInstanceKlass* implementor(int n);
204
205 // Is the defining class loader of this class the default loader?
206 bool uses_default_loader();
207
208 bool is_java_lang_Object();
209
210 // Is this klass in the given package?
211 bool is_in_package(const char* packagename) {
212 return is_in_package(packagename, (int) strlen(packagename));
213 }
214 bool is_in_package(const char* packagename, int len);
215
216 // What kind of ciObject is this?
217 bool is_instance_klass() { return true; }
218 bool is_java_klass() { return true; }
219 };
220
221 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP