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 "runtime/handles.inline.hpp"
  30 #include "runtime/thread.inline.hpp"
  31 #include "utilities/copy.hpp"
  32 
  33 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
  34 
  35 bool always_do_update_barrier = false;
  36 
  37 BarrierSet* oopDesc::_bs = NULL;
  38 
  39 void oopDesc::print_on(outputStream* st) const {
  40   if (this == NULL) {
  41     st->print_cr("NULL");
  42   } else {
  43     klass()->oop_print_on(oop(this), st);
  44   }
  45 }
  46 
  47 void oopDesc::print_address_on(outputStream* st) const {
  48   if (PrintOopAddress) {
  49     st->print("{"INTPTR_FORMAT"}", this);
  50   }
  51 }
  52 
  53 void oopDesc::print()         { print_on(tty);         }
  54 
  55 void oopDesc::print_address() { print_address_on(tty); }
  56 
  57 char* oopDesc::print_string() {
  58   stringStream st;
  59   print_on(&st);
  60   return st.as_string();
  61 }
  62 
  63 void oopDesc::print_value() {
  64   print_value_on(tty);
  65 }
  66 
  67 char* oopDesc::print_value_string() {
  68   char buf[100];
  69   stringStream st(buf, sizeof(buf));
  70   print_value_on(&st);
  71   return st.as_string();
  72 }
  73 
  74 void oopDesc::print_value_on(outputStream* st) const {
  75   oop obj = oop(this);
  76   if (this == NULL) {
  77     st->print("NULL");
  78   } else if (java_lang_String::is_instance(obj)) {
  79     java_lang_String::print(obj, st);
  80     if (PrintOopAddress) print_address_on(st);
  81   } else {
  82     klass()->oop_print_value_on(obj, st);
  83   }
  84 }
  85 
  86 
  87 void oopDesc::verify_on(outputStream* st) {
  88   if (this != NULL) {
  89     klass()->oop_verify_on(this, st);
  90   }
  91 }
  92 
  93 
  94 void oopDesc::verify() {
  95   verify_on(tty);
  96 }
  97 
  98 intptr_t oopDesc::slow_identity_hash() {
  99   // slow case; we have to acquire the micro lock in order to locate the header
 100   ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
 101   HandleMark hm;
 102   Handle object(this);
 103   return ObjectSynchronizer::identity_hash_value_for(object);
 104 }
 105 
 106 // When String table needs to rehash
 107 unsigned int oopDesc::new_hash(juint seed) {
 108   EXCEPTION_MARK;
 109   ResourceMark rm;
 110   int length;
 111   jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
 112   if (chars != NULL) {
 113     // Use alternate hashing algorithm on the string
 114     return AltHashing::murmur3_32(seed, chars, length);
 115   } else {
 116     vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
 117     return 0;
 118   }
 119 }
 120 
 121 VerifyOopClosure VerifyOopClosure::verify_oop;
 122 
 123 void VerifyOopClosure::do_oop(oop* p)       { VerifyOopClosure::do_oop_work(p); }
 124 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
 125 
 126 // type test operations that doesn't require inclusion of oop.inline.hpp.
 127 bool oopDesc::is_instance_noinline()          const { return is_instance();            }
 128 bool oopDesc::is_instanceMirror_noinline()    const { return is_instanceMirror();      }
 129 bool oopDesc::is_instanceClassLoader_noline() const { return is_instanceClassLoader(); }
 130 bool oopDesc::is_instanceRef_noline()         const { return is_instanceRef();         }
 131 bool oopDesc::is_array_noinline()             const { return is_array();               }
 132 bool oopDesc::is_objArray_noinline()          const { return is_objArray();            }
 133 bool oopDesc::is_typeArray_noinline()         const { return is_typeArray();           }
 134 
 135 bool oopDesc::has_klass_gap() {
 136   // Only has a klass gap when compressed class pointers are used.
 137   return UseCompressedClassPointers;
 138 }