1 /*
2 * Copyright (c) 1997, 2015, 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 #include "precompiled.hpp"
26 #include "classfile/altHashing.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "oops/oop.inline.hpp"
29 #include "oops/verifyOopClosure.hpp"
30 #include "runtime/handles.inline.hpp"
31 #include "runtime/thread.inline.hpp"
32 #include "utilities/copy.hpp"
33
34 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
35
36 bool always_do_update_barrier = false;
37
38 BarrierSet* oopDesc::_bs = NULL;
39
40 void oopDesc::print_on(outputStream* st) const {
41 if (this == NULL) {
42 st->print_cr("NULL");
43 } else {
44 klass()->oop_print_on(oop(this), st);
45 }
46 }
47
48 void oopDesc::print_address_on(outputStream* st) const {
49 if (PrintOopAddress) {
50 st->print("{" INTPTR_FORMAT "}", this);
51 }
52 }
53
54 void oopDesc::print() { print_on(tty); }
55
56 void oopDesc::print_address() { print_address_on(tty); }
57
58 char* oopDesc::print_string() {
59 stringStream st;
60 print_on(&st);
61 return st.as_string();
62 }
63
64 void oopDesc::print_value() {
65 print_value_on(tty);
66 }
67
68 char* oopDesc::print_value_string() {
69 char buf[100];
70 stringStream st(buf, sizeof(buf));
71 print_value_on(&st);
72 return st.as_string();
73 }
74
75 void oopDesc::print_value_on(outputStream* st) const {
76 oop obj = oop(this);
77 if (this == NULL) {
78 st->print("NULL");
79 } else if (java_lang_String::is_instance(obj)) {
80 java_lang_String::print(obj, st);
81 if (PrintOopAddress) print_address_on(st);
82 } else {
83 klass()->oop_print_value_on(obj, st);
84 }
85 }
86
87
88 void oopDesc::verify_on(outputStream* st) {
89 if (this != NULL) {
90 klass()->oop_verify_on(this, st);
91 }
92 }
93
94
95 void oopDesc::verify() {
96 verify_on(tty);
97 }
98
99 intptr_t oopDesc::slow_identity_hash() {
100 // slow case; we have to acquire the micro lock in order to locate the header
101 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
102 HandleMark hm;
103 Handle object(this);
104 return ObjectSynchronizer::identity_hash_value_for(object);
105 }
106
107 // When String table needs to rehash
108 unsigned int oopDesc::new_hash(juint seed) {
109 EXCEPTION_MARK;
110 ResourceMark rm;
111 int length;
112 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
113 if (chars != NULL) {
114 // Use alternate hashing algorithm on the string
115 return AltHashing::murmur3_32(seed, chars, length);
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 VerifyOopClosure VerifyOopClosure::verify_oop;
123
124 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
125 oop obj = oopDesc::load_decode_heap_oop(p);
126 guarantee(obj->is_oop_or_null(), err_msg("invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)));
127 }
128
129 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
130 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
131
132 // type test operations that doesn't require inclusion of oop.inline.hpp.
133 bool oopDesc::is_instance_noinline() const { return is_instance(); }
134 bool oopDesc::is_instanceMirror_noinline() const { return is_instanceMirror(); }
135 bool oopDesc::is_instanceClassLoader_noline() const { return is_instanceClassLoader(); }
136 bool oopDesc::is_instanceRef_noline() const { return is_instanceRef(); }
137 bool oopDesc::is_array_noinline() const { return is_array(); }
138 bool oopDesc::is_objArray_noinline() const { return is_objArray(); }
139 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); }
140
141 bool oopDesc::has_klass_gap() {
142 // Only has a klass gap when compressed class pointers are used.
143 return UseCompressedClassPointers;
144 }