Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/gc_implementation/concurrentMarkSweep/freeChunk.cpp
src/share/vm/gc_implementation/concurrentMarkSweep/freeChunk.cpp
- changeset 0
- f90c822e73f8
- child 6876
- 710a3c8b516e
equal
deleted
inserted
replaced
| -1:000000000000 | 0:f90c822e73f8 |
|---|---|
| 1 /* | |
| 2 * Copyright (c) 2001, 2014, 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/concurrentMarkSweep/freeChunk.hpp" | |
| 27 #include "memory/freeBlockDictionary.hpp" | |
| 28 #include "utilities/copy.hpp" | |
| 29 | |
| 30 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC | |
| 31 | |
| 32 #ifndef PRODUCT | |
| 33 | |
| 34 #define baadbabeHeapWord badHeapWordVal | |
| 35 #define deadbeefHeapWord 0xdeadbeef | |
| 36 | |
| 37 size_t const FreeChunk::header_size() { | |
| 38 return sizeof(FreeChunk)/HeapWordSize; | |
| 39 } | |
| 40 | |
| 41 void FreeChunk::mangleAllocated(size_t size) { | |
| 42 // mangle all but the header of a just-allocated block | |
| 43 // of storage | |
| 44 assert(size >= MinChunkSize, "smallest size of object"); | |
| 45 // we can't assert that _size == size because this may be an | |
| 46 // allocation out of a linear allocation block | |
| 47 assert(sizeof(FreeChunk) % HeapWordSize == 0, | |
| 48 "shouldn't write beyond chunk"); | |
| 49 HeapWord* addr = (HeapWord*)this; | |
| 50 size_t hdr = header_size(); | |
| 51 Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord); | |
| 52 } | |
| 53 | |
| 54 void FreeChunk::mangleFreed(size_t sz) { | |
| 55 assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns"); | |
| 56 // mangle all but the header of a just-freed block of storage | |
| 57 // just prior to passing it to the storage dictionary | |
| 58 assert(sz >= MinChunkSize, "smallest size of object"); | |
| 59 assert(sz == size(), "just checking"); | |
| 60 HeapWord* addr = (HeapWord*)this; | |
| 61 size_t hdr = header_size(); | |
| 62 Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord); | |
| 63 } | |
| 64 | |
| 65 void FreeChunk::verifyList() const { | |
| 66 FreeChunk* nextFC = next(); | |
| 67 if (nextFC != NULL) { | |
| 68 assert(this == nextFC->prev(), "broken chain"); | |
| 69 assert(size() == nextFC->size(), "wrong size"); | |
| 70 nextFC->verifyList(); | |
| 71 } | |
| 72 } | |
| 73 #endif | |
| 74 | |
| 75 void FreeChunk::print_on(outputStream* st) { | |
| 76 st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s", | |
| 77 next(), prev(), cantCoalesce() ? "[can't coalesce]" : ""); | |
| 78 } |
