1 /*
2 * Copyright 1999-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // ciInstanceKlass
26 //
27 // This class represents a klassOop in the HotSpot virtual machine
28 // whose Klass part is an instanceKlass. It may or may not
29 // be loaded.
30 class ciInstanceKlass : public ciKlass {
31 CI_PACKAGE_ACCESS
32 friend class ciBytecodeStream;
33 friend class ciEnv;
34 friend class ciExceptionHandler;
35 friend class ciMethod;
36 friend class ciField;
37
38 private:
39 jobject _loader;
40 jobject _protection_domain;
41
42 bool _is_shared;
43 bool _is_initialized;
44 bool _is_linked;
45 bool _has_finalizer;
46 bool _has_subklass;
47 bool _has_nonstatic_fields;
48
49 ciFlags _flags;
50 jint _nonstatic_field_size;
51 jint _nonstatic_oop_map_size;
52
53 // Lazy fields get filled in only upon request.
54 ciInstanceKlass* _super;
55 ciInstance* _java_mirror;
56
57 ciConstantPoolCache* _field_cache; // cached map index->field
58 GrowableArray<ciField*>* _nonstatic_fields;
59
60 enum { implementors_limit = instanceKlass::implementors_limit };
61 ciInstanceKlass* _implementors[implementors_limit];
62 jint _nof_implementors;
63
64 GrowableArray<ciField*>* _non_static_fields;
65
66 protected:
67 ciInstanceKlass(KlassHandle h_k);
68 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
69
70 instanceKlass* get_instanceKlass() const {
71 return (instanceKlass*)get_Klass();
72 }
73
74 oop loader();
75 jobject loader_handle();
76
77 oop protection_domain();
78 jobject protection_domain_handle();
79
80 const char* type_string() { return "ciInstanceKlass"; }
81
82 void print_impl(outputStream* st);
83
84 ciConstantPoolCache* field_cache();
85
86 bool is_shared() { return _is_shared; }
87
88 bool compute_shared_is_initialized();
89 bool compute_shared_is_linked();
90 bool compute_shared_has_subklass();
91 int compute_shared_nof_implementors();
92 int compute_nonstatic_fields();
93 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
94
95 public:
96 // Has this klass been initialized?
97 bool is_initialized() {
98 if (_is_shared && !_is_initialized) {
99 return is_loaded() && compute_shared_is_initialized();
100 }
101 return _is_initialized;
102 }
103 // Has this klass been linked?
104 bool is_linked() {
105 if (_is_shared && !_is_linked) {
106 return is_loaded() && compute_shared_is_linked();
107 }
108 return _is_linked;
109 }
110
111 // General klass information.
112 ciFlags flags() {
113 assert(is_loaded(), "must be loaded");
114 return _flags;
115 }
116 bool has_finalizer() {
117 assert(is_loaded(), "must be loaded");
118 return _has_finalizer; }
119 bool has_subklass() {
120 assert(is_loaded(), "must be loaded");
121 if (_is_shared && !_has_subklass) {
122 if (flags().is_final()) {
123 return false;
124 } else {
125 return compute_shared_has_subklass();
126 }
127 }
128 return _has_subklass;
129 }
130 jint size_helper() {
131 return (Klass::layout_helper_size_in_bytes(layout_helper())
132 >> LogHeapWordSize);
133 }
134 jint nonstatic_field_size() {
135 assert(is_loaded(), "must be loaded");
136 return _nonstatic_field_size; }
137 jint has_nonstatic_fields() {
138 assert(is_loaded(), "must be loaded");
139 return _has_nonstatic_fields; }
140 jint nonstatic_oop_map_size() {
141 assert(is_loaded(), "must be loaded");
142 return _nonstatic_oop_map_size; }
143 ciInstanceKlass* super();
144 jint nof_implementors() {
145 assert(is_loaded(), "must be loaded");
146 if (_is_shared) return compute_shared_nof_implementors();
147 return _nof_implementors;
148 }
149
150 ciInstanceKlass* get_canonical_holder(int offset);
151 ciField* get_field_by_offset(int field_offset, bool is_static);
152 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
153
154 GrowableArray<ciField*>* non_static_fields();
155
156 // total number of nonstatic fields (including inherited):
157 int nof_nonstatic_fields() {
158 if (_nonstatic_fields == NULL)
159 return compute_nonstatic_fields();
160 else
161 return _nonstatic_fields->length();
162 }
163 // nth nonstatic field (presented by ascending address)
164 ciField* nonstatic_field_at(int i) {
165 assert(_nonstatic_fields != NULL, "");
166 return _nonstatic_fields->at(i);
167 }
168
169 ciInstanceKlass* unique_concrete_subklass();
170 bool has_finalizable_subclass();
171
172 bool contains_field_offset(int offset) {
173 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
174 }
175
176 // Get the instance of java.lang.Class corresponding to
177 // this klass. This instance is used for locking of
178 // synchronized static methods of this klass.
179 ciInstance* java_mirror();
180
181 // Java access flags
182 bool is_public () { return flags().is_public(); }
183 bool is_final () { return flags().is_final(); }
184 bool is_super () { return flags().is_super(); }
185 bool is_interface () { return flags().is_interface(); }
186 bool is_abstract () { return flags().is_abstract(); }
187
188 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
189 // Note: To find a method from name and type strings, use ciSymbol::make,
190 // but consider adding to vmSymbols.hpp instead.
191
192 bool is_leaf_type();
193 ciInstanceKlass* implementor(int n);
194
195 // Is the defining class loader of this class the default loader?
196 bool uses_default_loader();
197
198 bool is_java_lang_Object();
199
200 // What kind of ciObject is this?
201 bool is_instance_klass() { return true; }
202 bool is_java_klass() { return true; }
203 };