src/share/vm/gc_implementation/concurrentMarkSweep/freeChunk.cpp

Tue, 18 Sep 2012 23:35:42 -0700

author
jmasa
date
Tue, 18 Sep 2012 23:35:42 -0700
changeset 4196
685df3c6f84b
parent 4153
b9a9ed0f8eeb
child 6680
78bbf4d43a14
permissions
-rw-r--r--

7045397: NPG: Add freelists to class loader arenas.
Reviewed-by: coleenp, stefank, jprovino, ohair

duke@435 1 /*
mikael@4153 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
stefank@2314 25 #include "precompiled.hpp"
jmasa@3730 26 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp"
jmasa@3730 27 #include "memory/freeBlockDictionary.hpp"
stefank@2314 28 #include "utilities/copy.hpp"
duke@435 29
duke@435 30 #ifndef PRODUCT
duke@435 31
duke@435 32 #define baadbabeHeapWord badHeapWordVal
duke@435 33 #define deadbeefHeapWord 0xdeadbeef
duke@435 34
duke@435 35 size_t const FreeChunk::header_size() {
duke@435 36 return sizeof(FreeChunk)/HeapWordSize;
duke@435 37 }
duke@435 38
duke@435 39 void FreeChunk::mangleAllocated(size_t size) {
duke@435 40 // mangle all but the header of a just-allocated block
duke@435 41 // of storage
duke@435 42 assert(size >= MinChunkSize, "smallest size of object");
duke@435 43 // we can't assert that _size == size because this may be an
duke@435 44 // allocation out of a linear allocation block
duke@435 45 assert(sizeof(FreeChunk) % HeapWordSize == 0,
duke@435 46 "shouldn't write beyond chunk");
duke@435 47 HeapWord* addr = (HeapWord*)this;
duke@435 48 size_t hdr = header_size();
duke@435 49 Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord);
duke@435 50 }
duke@435 51
coleenp@622 52 void FreeChunk::mangleFreed(size_t sz) {
duke@435 53 assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns");
duke@435 54 // mangle all but the header of a just-freed block of storage
duke@435 55 // just prior to passing it to the storage dictionary
coleenp@622 56 assert(sz >= MinChunkSize, "smallest size of object");
coleenp@622 57 assert(sz == size(), "just checking");
duke@435 58 HeapWord* addr = (HeapWord*)this;
duke@435 59 size_t hdr = header_size();
coleenp@622 60 Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord);
duke@435 61 }
duke@435 62
duke@435 63 void FreeChunk::verifyList() const {
duke@435 64 FreeChunk* nextFC = next();
duke@435 65 if (nextFC != NULL) {
duke@435 66 assert(this == nextFC->prev(), "broken chain");
duke@435 67 assert(size() == nextFC->size(), "wrong size");
duke@435 68 nextFC->verifyList();
duke@435 69 }
duke@435 70 }
duke@435 71 #endif
ysr@1580 72
ysr@1580 73 void FreeChunk::print_on(outputStream* st) {
ysr@1580 74 st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s",
ysr@1580 75 next(), prev(), cantCoalesce() ? "[can't coalesce]" : "");
ysr@1580 76 }

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