1 /*
   2  * Copyright (c) 1997, 2012, 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 "utilities/copy.hpp"
  31 #ifdef TARGET_OS_FAMILY_linux
  32 # include "thread_linux.inline.hpp"
  33 #endif
  34 #ifdef TARGET_OS_FAMILY_solaris
  35 # include "thread_solaris.inline.hpp"
  36 #endif
  37 #ifdef TARGET_OS_FAMILY_windows
  38 # include "thread_windows.inline.hpp"
  39 #endif
  40 #ifdef TARGET_OS_FAMILY_bsd
  41 # include "thread_bsd.inline.hpp"
  42 #endif
  43 
  44 bool always_do_update_barrier = false;
  45 
  46 BarrierSet* oopDesc::_bs = NULL;
  47 
  48 void oopDesc::print_on(outputStream* st) const {
  49   if (this == NULL) {
  50     st->print_cr("NULL");
  51   } else {
  52     klass()->oop_print_on(oop(this), st);
  53   }
  54 }
  55 
  56 void oopDesc::print_address_on(outputStream* st) const {
  57   if (PrintOopAddress) {
  58     st->print("{"INTPTR_FORMAT"}", this);
  59   }
  60 }
  61 
  62 void oopDesc::print()         { print_on(tty);         }
  63 
  64 void oopDesc::print_address() { print_address_on(tty); }
  65 
  66 char* oopDesc::print_string() {
  67   stringStream st;
  68   print_on(&st);
  69   return st.as_string();
  70 }
  71 
  72 void oopDesc::print_value() {
  73   print_value_on(tty);
  74 }
  75 
  76 char* oopDesc::print_value_string() {
  77   char buf[100];
  78   stringStream st(buf, sizeof(buf));
  79   print_value_on(&st);
  80   return st.as_string();
  81 }
  82 
  83 void oopDesc::print_value_on(outputStream* st) const {
  84   oop obj = oop(this);
  85   if (this == NULL) {
  86     st->print("NULL");
  87   } else if (java_lang_String::is_instance(obj)) {
  88     java_lang_String::print(obj, st);
  89     if (PrintOopAddress) print_address_on(st);
  90   } else {
  91     klass()->oop_print_value_on(obj, st);
  92   }
  93 }
  94 
  95 
  96 void oopDesc::verify_on(outputStream* st) {
  97   if (this != NULL) {
  98     klass()->oop_verify_on(this, st);
  99   }
 100 }
 101 
 102 
 103 void oopDesc::verify() {
 104   verify_on(tty);
 105 }
 106 
 107 intptr_t oopDesc::slow_identity_hash() {
 108   // slow case; we have to acquire the micro lock in order to locate the header
 109   ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
 110   HandleMark hm;
 111   Handle object(this);
 112   return ObjectSynchronizer::identity_hash_value_for(object);
 113 }
 114 
 115 // When String table needs to rehash
 116 unsigned int oopDesc::new_hash(jint seed) {
 117   ResourceMark rm;
 118   int length;
 119   jchar* chars = java_lang_String::as_unicode_string(this, length);
 120   // Use alternate hashing algorithm on the string
 121   return AltHashing::murmur3_32(seed, chars, length);
 122 }
 123 
 124 VerifyOopClosure VerifyOopClosure::verify_oop;
 125 
 126 void VerifyOopClosure::do_oop(oop* p)       { VerifyOopClosure::do_oop_work(p); }
 127 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }