src/share/vm/gc_implementation/shared/spaceDecorator.cpp

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   1 /*
   2  * Copyright (c) 2002, 2008, 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 "incls/_precompiled.incl"
  26 # include "incls/_spaceDecorator.cpp.incl"


  27 
  28 // Catch-all file for utility classes
  29 
  30 #ifndef PRODUCT
  31 
  32 // Returns true is the location q matches the mangling
  33 // pattern.
  34 bool SpaceMangler::is_mangled(HeapWord* q) {
  35   // This test loses precision but is good enough
  36   return badHeapWord == (max_juint & (uintptr_t) q->value());
  37 }
  38 
  39 
  40 void SpaceMangler::set_top_for_allocations(HeapWord* v)  {
  41   if (v < end()) {
  42     assert(!CheckZapUnusedHeapArea || is_mangled(v),
  43       "The high water mark is not mangled");
  44   }
  45   _top_for_allocations = v;
  46 }


   1 /*
   2  * Copyright (c) 2002, 2010, 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 "gc_implementation/shared/spaceDecorator.hpp"
  27 #include "memory/space.inline.hpp"
  28 #include "utilities/copy.hpp"
  29 
  30 // Catch-all file for utility classes
  31 
  32 #ifndef PRODUCT
  33 
  34 // Returns true is the location q matches the mangling
  35 // pattern.
  36 bool SpaceMangler::is_mangled(HeapWord* q) {
  37   // This test loses precision but is good enough
  38   return badHeapWord == (max_juint & (uintptr_t) q->value());
  39 }
  40 
  41 
  42 void SpaceMangler::set_top_for_allocations(HeapWord* v)  {
  43   if (v < end()) {
  44     assert(!CheckZapUnusedHeapArea || is_mangled(v),
  45       "The high water mark is not mangled");
  46   }
  47   _top_for_allocations = v;
  48 }