1 /*
2 * Copyright (c) 1997, 2017, 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 *
116 } else {
117 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
118 return 0;
119 }
120 }
121
122 // used only for asserts and guarantees
123 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
124 if (!check_obj_alignment(obj)) return false;
125 if (!Universe::heap()->is_in_reserved(obj)) return false;
126 // obj is aligned and accessible in heap
127 if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false;
128
129 // Header verification: the mark is typically non-NULL. If we're
130 // at a safepoint, it must not be null.
131 // Outside of a safepoint, the header could be changing (for example,
132 // another thread could be inflating a lock on this object).
133 if (ignore_mark_word) {
134 return true;
135 }
136 if (obj->mark() != NULL) {
137 return true;
138 }
139 return !SafepointSynchronize::is_at_safepoint();
140 }
141
142 // used only for asserts and guarantees
143 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
144 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
145 }
146
147 #ifndef PRODUCT
148 // used only for asserts
149 bool oopDesc::is_unlocked_oop() const {
150 if (!Universe::heap()->is_in_reserved(this)) return false;
151 return mark()->is_unlocked();
152 }
153 #endif // PRODUCT
154
155 VerifyOopClosure VerifyOopClosure::verify_oop;
156
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1 /*
2 * Copyright (c) 1997, 2018, 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 *
116 } else {
117 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
118 return 0;
119 }
120 }
121
122 // used only for asserts and guarantees
123 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
124 if (!check_obj_alignment(obj)) return false;
125 if (!Universe::heap()->is_in_reserved(obj)) return false;
126 // obj is aligned and accessible in heap
127 if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false;
128
129 // Header verification: the mark is typically non-NULL. If we're
130 // at a safepoint, it must not be null.
131 // Outside of a safepoint, the header could be changing (for example,
132 // another thread could be inflating a lock on this object).
133 if (ignore_mark_word) {
134 return true;
135 }
136 if (obj->mark_raw() != NULL) {
137 return true;
138 }
139 return !SafepointSynchronize::is_at_safepoint();
140 }
141
142 // used only for asserts and guarantees
143 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
144 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
145 }
146
147 #ifndef PRODUCT
148 // used only for asserts
149 bool oopDesc::is_unlocked_oop() const {
150 if (!Universe::heap()->is_in_reserved(this)) return false;
151 return mark()->is_unlocked();
152 }
153 #endif // PRODUCT
154
155 VerifyOopClosure VerifyOopClosure::verify_oop;
156
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