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 21 * questions. 22 * 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 inline HeapWord* ContiguousSpace::concurrent_iteration_safe_limit() 71 { 72 assert(_concurrent_iteration_safe_limit <= top(), 73 "_concurrent_iteration_safe_limit update missed"); 74 return _concurrent_iteration_safe_limit; 75 } 76 77 inline void ContiguousSpace::set_concurrent_iteration_safe_limit(HeapWord* new_limit) 78 { 79 assert(new_limit <= top(), "uninitialized objects in the safe range"); 80 _concurrent_iteration_safe_limit = new_limit; 81 } 82 83 #endif // SHARE_VM_MEMORY_SPACE_INLINE_HPP