Mon, 12 Jul 2010 10:58:25 -0700
6958668: repeated uncommon trapping for new of klass which is being initialized
Reviewed-by: kvn, jrose
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 */
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;
38 private:
39 jobject _loader;
40 jobject _protection_domain;
42 instanceKlass::ClassState _init_state; // state of class
43 bool _is_shared;
44 bool _has_finalizer;
45 bool _has_subklass;
46 bool _has_nonstatic_fields;
48 ciFlags _flags;
49 jint _nonstatic_field_size;
50 jint _nonstatic_oop_map_size;
52 // Lazy fields get filled in only upon request.
53 ciInstanceKlass* _super;
54 ciInstance* _java_mirror;
56 ciConstantPoolCache* _field_cache; // cached map index->field
57 GrowableArray<ciField*>* _nonstatic_fields;
59 enum { implementors_limit = instanceKlass::implementors_limit };
60 ciInstanceKlass* _implementors[implementors_limit];
61 jint _nof_implementors;
63 GrowableArray<ciField*>* _non_static_fields;
65 protected:
66 ciInstanceKlass(KlassHandle h_k);
67 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
69 instanceKlass* get_instanceKlass() const {
70 return (instanceKlass*)get_Klass();
71 }
73 oop loader();
74 jobject loader_handle();
76 oop protection_domain();
77 jobject protection_domain_handle();
79 const char* type_string() { return "ciInstanceKlass"; }
81 bool is_in_package_impl(const char* packagename, int len);
83 void print_impl(outputStream* st);
85 ciConstantPoolCache* field_cache();
87 bool is_shared() { return _is_shared; }
89 void compute_shared_init_state();
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);
95 // Update the init_state for shared klasses
96 void update_if_shared(instanceKlass::ClassState expected) {
97 if (_is_shared && _init_state != expected) {
98 if (is_loaded()) compute_shared_init_state();
99 }
100 }
102 public:
103 // Has this klass been initialized?
104 bool is_initialized() {
105 update_if_shared(instanceKlass::fully_initialized);
106 return _init_state == instanceKlass::fully_initialized;
107 }
108 // Is this klass being initialized?
109 bool is_being_initialized() {
110 update_if_shared(instanceKlass::being_initialized);
111 return _init_state == instanceKlass::being_initialized;
112 }
113 // Has this klass been linked?
114 bool is_linked() {
115 update_if_shared(instanceKlass::linked);
116 return _init_state >= instanceKlass::linked;
117 }
119 // General klass information.
120 ciFlags flags() {
121 assert(is_loaded(), "must be loaded");
122 return _flags;
123 }
124 bool has_finalizer() {
125 assert(is_loaded(), "must be loaded");
126 return _has_finalizer; }
127 bool has_subklass() {
128 assert(is_loaded(), "must be loaded");
129 if (_is_shared && !_has_subklass) {
130 if (flags().is_final()) {
131 return false;
132 } else {
133 return compute_shared_has_subklass();
134 }
135 }
136 return _has_subklass;
137 }
138 jint size_helper() {
139 return (Klass::layout_helper_size_in_bytes(layout_helper())
140 >> LogHeapWordSize);
141 }
142 jint nonstatic_field_size() {
143 assert(is_loaded(), "must be loaded");
144 return _nonstatic_field_size; }
145 jint has_nonstatic_fields() {
146 assert(is_loaded(), "must be loaded");
147 return _has_nonstatic_fields; }
148 jint nonstatic_oop_map_size() {
149 assert(is_loaded(), "must be loaded");
150 return _nonstatic_oop_map_size; }
151 ciInstanceKlass* super();
152 jint nof_implementors() {
153 assert(is_loaded(), "must be loaded");
154 if (_is_shared) return compute_shared_nof_implementors();
155 return _nof_implementors;
156 }
158 ciInstanceKlass* get_canonical_holder(int offset);
159 ciField* get_field_by_offset(int field_offset, bool is_static);
160 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
162 GrowableArray<ciField*>* non_static_fields();
164 // total number of nonstatic fields (including inherited):
165 int nof_nonstatic_fields() {
166 if (_nonstatic_fields == NULL)
167 return compute_nonstatic_fields();
168 else
169 return _nonstatic_fields->length();
170 }
171 // nth nonstatic field (presented by ascending address)
172 ciField* nonstatic_field_at(int i) {
173 assert(_nonstatic_fields != NULL, "");
174 return _nonstatic_fields->at(i);
175 }
177 ciInstanceKlass* unique_concrete_subklass();
178 bool has_finalizable_subclass();
180 bool contains_field_offset(int offset) {
181 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
182 }
184 // Get the instance of java.lang.Class corresponding to
185 // this klass. This instance is used for locking of
186 // synchronized static methods of this klass.
187 ciInstance* java_mirror();
189 // Java access flags
190 bool is_public () { return flags().is_public(); }
191 bool is_final () { return flags().is_final(); }
192 bool is_super () { return flags().is_super(); }
193 bool is_interface () { return flags().is_interface(); }
194 bool is_abstract () { return flags().is_abstract(); }
196 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
197 // Note: To find a method from name and type strings, use ciSymbol::make,
198 // but consider adding to vmSymbols.hpp instead.
200 bool is_leaf_type();
201 ciInstanceKlass* implementor(int n);
203 // Is the defining class loader of this class the default loader?
204 bool uses_default_loader();
206 bool is_java_lang_Object();
208 // Is this klass in the given package?
209 bool is_in_package(const char* packagename) {
210 return is_in_package(packagename, (int) strlen(packagename));
211 }
212 bool is_in_package(const char* packagename, int len);
214 // What kind of ciObject is this?
215 bool is_instance_klass() { return true; }
216 bool is_java_klass() { return true; }
217 };