1 /*
   2  * Copyright (c) 2000, 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
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  23  */
  24 
  25 #ifndef SHARE_VM_MEMORY_SPACE_INLINE_HPP
  26 #define SHARE_VM_MEMORY_SPACE_INLINE_HPP
  27 
  28 #include "gc_interface/collectedHeap.hpp"
  29 #include "memory/space.hpp"
  30 #include "memory/universe.hpp"
  31 #include "runtime/safepoint.hpp"
  32 
  33 inline HeapWord* Space::block_start(const void* p) {
  34   return block_start_const(p);
  35 }
  36 
  37 inline HeapWord* OffsetTableContigSpace::allocate(size_t size) {
  38   HeapWord* res = ContiguousSpace::allocate(size);
  39   if (res != NULL) {
  40     _offsets.alloc_block(res, size);
  41   }
  42   return res;
  43 }
  44 
  45 // Because of the requirement of keeping "_offsets" up to date with the
  46 // allocations, we sequentialize these with a lock.  Therefore, best if
  47 // this is used for larger LAB allocations only.
  48 inline HeapWord* OffsetTableContigSpace::par_allocate(size_t size) {
  49   MutexLocker x(&_par_alloc_lock);
  50   // This ought to be just "allocate", because of the lock above, but that
  51   // ContiguousSpace::allocate asserts that either the allocating thread
  52   // holds the heap lock or it is the VM thread and we're at a safepoint.
  53   // The best I (dld) could figure was to put a field in ContiguousSpace
  54   // meaning "locking at safepoint taken care of", and set/reset that
  55   // here.  But this will do for now, especially in light of the comment
  56   // above.  Perhaps in the future some lock-free manner of keeping the
  57   // coordination.
  58   HeapWord* res = ContiguousSpace::par_allocate(size);
  59   if (res != NULL) {
  60     _offsets.alloc_block(res, size);
  61   }
  62   return res;
  63 }
  64 
  65 inline HeapWord*
  66 OffsetTableContigSpace::block_start_const(const void* p) const {
  67   return _offsets.block_start(p);
  68 }
  69 
  70 #endif // SHARE_VM_MEMORY_SPACE_INLINE_HPP