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 "runtime/thread.inline.hpp"
  31 #include "utilities/copy.hpp"
  32 
  33 bool always_do_update_barrier = false;
  34 
  35 BarrierSet* oopDesc::_bs = NULL;
  36 
  37 void 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 
  45 void oopDesc::print_address_on(outputStream* st) const {
  46   if (PrintOopAddress) {
  47     st->print("{"INTPTR_FORMAT"}", this);
  48   }
  49 }
  50 
  51 void oopDesc::print()         { print_on(tty);         }
  52 
  53 void oopDesc::print_address() { print_address_on(tty); }
  54 
  55 char* oopDesc::print_string() {
  56   stringStream st;
  57   print_on(&st);
  58   return st.as_string();
  59 }
  60 
  61 void oopDesc::print_value() {
  62   print_value_on(tty);
  63 }
  64 
  65 char* 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 
  72 void 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 
  85 void oopDesc::verify_on(outputStream* st) {
  86   if (this != NULL) {
  87     klass()->oop_verify_on(this, st);
  88   }
  89 }
  90 
  91 
  92 void oopDesc::verify() {
  93   verify_on(tty);
  94 }
  95 
  96 intptr_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
 105 unsigned int oopDesc::new_hash(jint seed) {
 106   ResourceMark rm;
 107   int length;
 108   jchar* chars = java_lang_String::as_unicode_string(this, length);
 109   // Use alternate hashing algorithm on the string
 110   return AltHashing::murmur3_32(seed, chars, length);
 111 }
 112 
 113 VerifyOopClosure VerifyOopClosure::verify_oop;
 114 
 115 void VerifyOopClosure::do_oop(oop* p)       { VerifyOopClosure::do_oop_work(p); }
 116 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }