oop.cpp revision 4558:746b070f5022 
1/*
2 * Copyright (c) 1997, 2013, 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.hpp"
28#include "oops/oop.inline.hpp"
29#include "runtime/handles.inline.hpp"
30#include "runtime/thread.inline.hpp"
31#include "utilities/copy.hpp"
32
33bool always_do_update_barrier = false;
34
35BarrierSet* oopDesc::_bs = NULL;
36
37void oopDesc::print_on(outputStream* st) const {
38  if (this == NULL) {
39    st->print_cr("NULL");
40  } else {
41    klass()->oop_print_on(oop(this), st);
42  }
43}
44
45void oopDesc::print_address_on(outputStream* st) const {
46  if (PrintOopAddress) {
47    st->print("{"INTPTR_FORMAT"}", this);
48  }
49}
50
51void oopDesc::print()         { print_on(tty);         }
52
53void oopDesc::print_address() { print_address_on(tty); }
54
55char* oopDesc::print_string() {
56  stringStream st;
57  print_on(&st);
58  return st.as_string();
59}
60
61void oopDesc::print_value() {
62  print_value_on(tty);
63}
64
65char* oopDesc::print_value_string() {
66  char buf[100];
67  stringStream st(buf, sizeof(buf));
68  print_value_on(&st);
69  return st.as_string();
70}
71
72void oopDesc::print_value_on(outputStream* st) const {
73  oop obj = oop(this);
74  if (this == NULL) {
75    st->print("NULL");
76  } else if (java_lang_String::is_instance(obj)) {
77    java_lang_String::print(obj, st);
78    if (PrintOopAddress) print_address_on(st);
79  } else {
80    klass()->oop_print_value_on(obj, st);
81  }
82}
83
84
85void oopDesc::verify_on(outputStream* st) {
86  if (this != NULL) {
87    klass()->oop_verify_on(this, st);
88  }
89}
90
91
92void oopDesc::verify() {
93  verify_on(tty);
94}
95
96intptr_t oopDesc::slow_identity_hash() {
97  // slow case; we have to acquire the micro lock in order to locate the header
98  ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
99  HandleMark hm;
100  Handle object(this);
101  return ObjectSynchronizer::identity_hash_value_for(object);
102}
103
104// When String table needs to rehash
105unsigned int oopDesc::new_hash(jint seed) {
106  EXCEPTION_MARK;
107  ResourceMark rm;
108  int length;
109  jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
110  if (chars != NULL) {
111    // Use alternate hashing algorithm on the string
112    return AltHashing::murmur3_32(seed, chars, length);
113  } else {
114    vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
115    return 0;
116  }
117}
118
119VerifyOopClosure VerifyOopClosure::verify_oop;
120
121void VerifyOopClosure::do_oop(oop* p)       { VerifyOopClosure::do_oop_work(p); }
122void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
123