1 /*
   2  * Copyright (c) 1997, 2017, 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  *

 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 // used only for asserts and guarantees
 123 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
 124   if (!check_obj_alignment(obj)) return false;
 125   if (!Universe::heap()->is_in_reserved(obj)) return false;
 126   // obj is aligned and accessible in heap
 127   if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false;
 128 
 129   // Header verification: the mark is typically non-NULL. If we're
 130   // at a safepoint, it must not be null.
 131   // Outside of a safepoint, the header could be changing (for example,
 132   // another thread could be inflating a lock on this object).
 133   if (ignore_mark_word) {
 134     return true;
 135   }
 136   if (obj->mark() != NULL) {
 137     return true;
 138   }
 139   return !SafepointSynchronize::is_at_safepoint();
 140 }
 141 
 142 // used only for asserts and guarantees
 143 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
 144   return obj == NULL ? true : is_oop(obj, ignore_mark_word);
 145 }
 146 
 147 #ifndef PRODUCT
 148 // used only for asserts
 149 bool oopDesc::is_unlocked_oop() const {
 150   if (!Universe::heap()->is_in_reserved(this)) return false;
 151   return mark()->is_unlocked();
 152 }
 153 #endif // PRODUCT
 154 
 155 VerifyOopClosure VerifyOopClosure::verify_oop;
 156 

   1 /*
   2  * Copyright (c) 1997, 2018, 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  *

 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 // used only for asserts and guarantees
 123 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
 124   if (!check_obj_alignment(obj)) return false;
 125   if (!Universe::heap()->is_in_reserved(obj)) return false;
 126   // obj is aligned and accessible in heap
 127   if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false;
 128 
 129   // Header verification: the mark is typically non-NULL. If we're
 130   // at a safepoint, it must not be null.
 131   // Outside of a safepoint, the header could be changing (for example,
 132   // another thread could be inflating a lock on this object).
 133   if (ignore_mark_word) {
 134     return true;
 135   }
 136   if (obj->mark_raw() != NULL) {
 137     return true;
 138   }
 139   return !SafepointSynchronize::is_at_safepoint();
 140 }
 141 
 142 // used only for asserts and guarantees
 143 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
 144   return obj == NULL ? true : is_oop(obj, ignore_mark_word);
 145 }
 146 
 147 #ifndef PRODUCT
 148 // used only for asserts
 149 bool oopDesc::is_unlocked_oop() const {
 150   if (!Universe::heap()->is_in_reserved(this)) return false;
 151   return mark()->is_unlocked();
 152 }
 153 #endif // PRODUCT
 154 
 155 VerifyOopClosure VerifyOopClosure::verify_oop;
 156