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
68 enum { implementors_limit = instanceKlass::implementors_limit };
69 ciInstanceKlass* _implementors[implementors_limit];
70 jint _nof_implementors;
71
72 GrowableArray<ciField*>* _non_static_fields;
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_shared_nof_implementors();
101 int compute_nonstatic_fields();
102 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
103
104 // Update the init_state for shared klasses
105 void update_if_shared(instanceKlass::ClassState expected) {
106 if (_is_shared && _init_state != expected) {
107 if (is_loaded()) compute_shared_init_state();
108 }
109 }
110
111 public:
112 // Has this klass been initialized?
113 bool is_initialized() {
114 update_if_shared(instanceKlass::fully_initialized);
115 return _init_state == instanceKlass::fully_initialized;
116 }
117 // Is this klass being initialized?
118 bool is_being_initialized() {
119 update_if_shared(instanceKlass::being_initialized);
120 return _init_state == instanceKlass::being_initialized;
121 }
122 // Has this klass been linked?
123 bool is_linked() {
124 update_if_shared(instanceKlass::linked);
125 return _init_state >= instanceKlass::linked;
126 }
127
128 // General klass information.
129 ciFlags flags() {
130 assert(is_loaded(), "must be loaded");
131 return _flags;
132 }
133 bool has_finalizer() {
134 assert(is_loaded(), "must be loaded");
135 return _has_finalizer; }
136 bool has_subklass() {
137 assert(is_loaded(), "must be loaded");
138 if (_is_shared && !_has_subklass) {
139 if (flags().is_final()) {
140 return false;
141 } else {
142 return compute_shared_has_subklass();
143 }
144 }
145 return _has_subklass;
146 }
147 jint size_helper() {
148 return (Klass::layout_helper_size_in_bytes(layout_helper())
149 >> LogHeapWordSize);
150 }
151 jint nonstatic_field_size() {
152 assert(is_loaded(), "must be loaded");
153 return _nonstatic_field_size; }
154 jint has_nonstatic_fields() {
155 assert(is_loaded(), "must be loaded");
156 return _has_nonstatic_fields; }
157 jint nonstatic_oop_map_size() {
158 assert(is_loaded(), "must be loaded");
159 return _nonstatic_oop_map_size; }
160 ciInstanceKlass* super();
161 jint nof_implementors() {
162 assert(is_loaded(), "must be loaded");
163 if (_is_shared) return compute_shared_nof_implementors();
164 return _nof_implementors;
165 }
166
167 ciInstanceKlass* get_canonical_holder(int offset);
168 ciField* get_field_by_offset(int field_offset, bool is_static);
169 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
170
171 GrowableArray<ciField*>* non_static_fields();
172
173 // total number of nonstatic fields (including inherited):
174 int nof_nonstatic_fields() {
175 if (_nonstatic_fields == NULL)
176 return compute_nonstatic_fields();
177 else
178 return _nonstatic_fields->length();
179 }
180 // nth nonstatic field (presented by ascending address)
181 ciField* nonstatic_field_at(int i) {
182 assert(_nonstatic_fields != NULL, "");
183 return _nonstatic_fields->at(i);
184 }
185
186 ciInstanceKlass* unique_concrete_subklass();
187 bool has_finalizable_subclass();
188
189 bool contains_field_offset(int offset) {
190 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
191 }
192
193 // Get the instance of java.lang.Class corresponding to
194 // this klass. This instance is used for locking of
195 // synchronized static methods of this klass.
196 ciInstance* java_mirror();
197
198 // Java access flags
199 bool is_public () { return flags().is_public(); }
200 bool is_final () { return flags().is_final(); }
201 bool is_super () { return flags().is_super(); }
202 bool is_interface () { return flags().is_interface(); }
203 bool is_abstract () { return flags().is_abstract(); }
204
205 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
206 // Note: To find a method from name and type strings, use ciSymbol::make,
207 // but consider adding to vmSymbols.hpp instead.
208
209 bool is_leaf_type();
210 ciInstanceKlass* implementor(int n);
211
212 // Is the defining class loader of this class the default loader?
213 bool uses_default_loader();
214
215 bool is_java_lang_Object();
216
217 // Is this klass in the given package?
218 bool is_in_package(const char* packagename) {
219 return is_in_package(packagename, (int) strlen(packagename));
220 }
221 bool is_in_package(const char* packagename, int len);
222
223 // What kind of ciObject is this?
224 bool is_instance_klass() { return true; }
225 bool is_java_klass() { return true; }
226 };
227
228 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP