1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/freeChunk.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,69 @@
1.4 +/*
1.5 + * Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +# include "incls/_precompiled.incl"
1.29 +# include "incls/_freeChunk.cpp.incl"
1.30 +
1.31 +#ifndef PRODUCT
1.32 +
1.33 +#define baadbabeHeapWord badHeapWordVal
1.34 +#define deadbeefHeapWord 0xdeadbeef
1.35 +
1.36 +size_t const FreeChunk::header_size() {
1.37 + return sizeof(FreeChunk)/HeapWordSize;
1.38 +}
1.39 +
1.40 +void FreeChunk::mangleAllocated(size_t size) {
1.41 + // mangle all but the header of a just-allocated block
1.42 + // of storage
1.43 + assert(size >= MinChunkSize, "smallest size of object");
1.44 + // we can't assert that _size == size because this may be an
1.45 + // allocation out of a linear allocation block
1.46 + assert(sizeof(FreeChunk) % HeapWordSize == 0,
1.47 + "shouldn't write beyond chunk");
1.48 + HeapWord* addr = (HeapWord*)this;
1.49 + size_t hdr = header_size();
1.50 + Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord);
1.51 +}
1.52 +
1.53 +void FreeChunk::mangleFreed(size_t size) {
1.54 + assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns");
1.55 + // mangle all but the header of a just-freed block of storage
1.56 + // just prior to passing it to the storage dictionary
1.57 + assert(size >= MinChunkSize, "smallest size of object");
1.58 + assert(size == _size, "just checking");
1.59 + HeapWord* addr = (HeapWord*)this;
1.60 + size_t hdr = header_size();
1.61 + Copy::fill_to_words(addr + hdr, size - hdr, deadbeefHeapWord);
1.62 +}
1.63 +
1.64 +void FreeChunk::verifyList() const {
1.65 + FreeChunk* nextFC = next();
1.66 + if (nextFC != NULL) {
1.67 + assert(this == nextFC->prev(), "broken chain");
1.68 + assert(size() == nextFC->size(), "wrong size");
1.69 + nextFC->verifyList();
1.70 + }
1.71 +}
1.72 +#endif
