Mercurial > hg > graal-jvmci-8

comparison src/share/vm/gc_implementation/concurrentMarkSweep/freeChunk.cpp @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children 790e66e5fbac
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_freeChunk.cpp.incl"
27
28 #ifndef PRODUCT
29
30 #define baadbabeHeapWord badHeapWordVal
31 #define deadbeefHeapWord 0xdeadbeef
32
33 size_t const FreeChunk::header_size() {
34 return sizeof(FreeChunk)/HeapWordSize;
35 }
36
37 void FreeChunk::mangleAllocated(size_t size) {
38 // mangle all but the header of a just-allocated block
39 // of storage
40 assert(size >= MinChunkSize, "smallest size of object");
41 // we can't assert that _size == size because this may be an
42 // allocation out of a linear allocation block
43 assert(sizeof(FreeChunk) % HeapWordSize == 0,
44 "shouldn't write beyond chunk");
45 HeapWord* addr = (HeapWord*)this;
46 size_t hdr = header_size();
47 Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord);
48 }
49
50 void FreeChunk::mangleFreed(size_t size) {
51 assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns");
52 // mangle all but the header of a just-freed block of storage
53 // just prior to passing it to the storage dictionary
54 assert(size >= MinChunkSize, "smallest size of object");
55 assert(size == _size, "just checking");
56 HeapWord* addr = (HeapWord*)this;
57 size_t hdr = header_size();
58 Copy::fill_to_words(addr + hdr, size - hdr, deadbeefHeapWord);
59 }
60
61 void FreeChunk::verifyList() const {
62 FreeChunk* nextFC = next();
63 if (nextFC != NULL) {
64 assert(this == nextFC->prev(), "broken chain");
65 assert(size() == nextFC->size(), "wrong size");
66 nextFC->verifyList();
67 }
68 }
69 #endif