1 /*
   2  * Copyright (c) 2001, 2007, 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 inline HeapRegion* HeapRegionSeq::addr_to_region(const void* addr) {
  26   assert(_seq_bottom != NULL, "bad _seq_bottom in addr_to_region");
  27   if ((char*) addr >= _seq_bottom) {
  28     size_t diff = (size_t) pointer_delta((HeapWord*) addr,
  29                                          (HeapWord*) _seq_bottom);
  30     int index = (int) (diff >> HeapRegion::LogOfHRGrainWords);
  31     assert(index >= 0, "invariant / paranoia");
  32     if (index < _regions.length()) {
  33       HeapRegion* hr = _regions.at(index);
  34       assert(hr->is_in_reserved(addr),
  35              "addr_to_region is wrong...");
  36       return hr;
  37     }
  38   }
  39   return NULL;
  40 }