| /* |
| * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" |
| #include "memory/freeBlockDictionary.hpp" |
| #include "utilities/copy.hpp" |
| |
| PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
| |
| #ifndef PRODUCT |
| |
| #define baadbabeHeapWord badHeapWordVal |
| #define deadbeefHeapWord 0xdeadbeef |
| |
| size_t const FreeChunk::header_size() { |
| return sizeof(FreeChunk)/HeapWordSize; |
| } |
| |
| void FreeChunk::mangleAllocated(size_t size) { |
| // mangle all but the header of a just-allocated block |
| // of storage |
| assert(size >= MinChunkSize, "smallest size of object"); |
| // we can't assert that _size == size because this may be an |
| // allocation out of a linear allocation block |
| assert(sizeof(FreeChunk) % HeapWordSize == 0, |
| "shouldn't write beyond chunk"); |
| HeapWord* addr = (HeapWord*)this; |
| size_t hdr = header_size(); |
| Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord); |
| } |
| |
| void FreeChunk::mangleFreed(size_t sz) { |
| assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns"); |
| // mangle all but the header of a just-freed block of storage |
| // just prior to passing it to the storage dictionary |
| assert(sz >= MinChunkSize, "smallest size of object"); |
| assert(sz == size(), "just checking"); |
| HeapWord* addr = (HeapWord*)this; |
| size_t hdr = header_size(); |
| Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord); |
| } |
| |
| void FreeChunk::verifyList() const { |
| FreeChunk* nextFC = next(); |
| if (nextFC != NULL) { |
| assert(this == nextFC->prev(), "broken chain"); |
| assert(size() == nextFC->size(), "wrong size"); |
| nextFC->verifyList(); |
| } |
| } |
| #endif |
| |
| void FreeChunk::print_on(outputStream* st) { |
| st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s", |
| next(), prev(), cantCoalesce() ? "[can't coalesce]" : ""); |
| } |