duke@435: /*
stefank@2314:  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "gc_implementation/concurrentMarkSweep/freeBlockDictionary.hpp"
stefank@2314: #include "utilities/copy.hpp"
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: 
duke@435: #define baadbabeHeapWord badHeapWordVal
duke@435: #define deadbeefHeapWord 0xdeadbeef
duke@435: 
duke@435: size_t const FreeChunk::header_size() {
duke@435:   return sizeof(FreeChunk)/HeapWordSize;
duke@435: }
duke@435: 
duke@435: void FreeChunk::mangleAllocated(size_t size) {
duke@435:   // mangle all but the header of a just-allocated block
duke@435:   // of storage
duke@435:   assert(size >= MinChunkSize, "smallest size of object");
duke@435:   // we can't assert that _size == size because this may be an
duke@435:   // allocation out of a linear allocation block
duke@435:   assert(sizeof(FreeChunk) % HeapWordSize == 0,
duke@435:          "shouldn't write beyond chunk");
duke@435:   HeapWord* addr = (HeapWord*)this;
duke@435:   size_t hdr = header_size();
duke@435:   Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord);
duke@435: }
duke@435: 
coleenp@622: void FreeChunk::mangleFreed(size_t sz) {
duke@435:   assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns");
duke@435:   // mangle all but the header of a just-freed block of storage
duke@435:   // just prior to passing it to the storage dictionary
coleenp@622:   assert(sz >= MinChunkSize, "smallest size of object");
coleenp@622:   assert(sz == size(), "just checking");
duke@435:   HeapWord* addr = (HeapWord*)this;
duke@435:   size_t hdr = header_size();
coleenp@622:   Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord);
duke@435: }
duke@435: 
duke@435: void FreeChunk::verifyList() const {
duke@435:   FreeChunk* nextFC = next();
duke@435:   if (nextFC != NULL) {
duke@435:     assert(this == nextFC->prev(), "broken chain");
duke@435:     assert(size() == nextFC->size(), "wrong size");
duke@435:     nextFC->verifyList();
duke@435:   }
duke@435: }
duke@435: #endif
ysr@1580: 
ysr@1580: void FreeChunk::print_on(outputStream* st) {
ysr@1580:   st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s",
ysr@1580:     next(), prev(), cantCoalesce() ? "[can't coalesce]" : "");
ysr@1580: }