author | jmasa |
Thu, 29 Mar 2012 19:46:24 -0700 | |
changeset 12507 | 6182ca66bc7b |
parent 7397 | 5b173b4ca846 |
child 13963 | e5b53c306fb5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" |
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#include "memory/freeBlockDictionary.hpp" |
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#include "utilities/copy.hpp" |
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#ifndef PRODUCT |
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#define baadbabeHeapWord badHeapWordVal |
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#define deadbeefHeapWord 0xdeadbeef |
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size_t const FreeChunk::header_size() { |
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return sizeof(FreeChunk)/HeapWordSize; |
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} |
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void FreeChunk::mangleAllocated(size_t size) { |
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// mangle all but the header of a just-allocated block |
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// of storage |
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assert(size >= MinChunkSize, "smallest size of object"); |
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// we can't assert that _size == size because this may be an |
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// allocation out of a linear allocation block |
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assert(sizeof(FreeChunk) % HeapWordSize == 0, |
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"shouldn't write beyond chunk"); |
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HeapWord* addr = (HeapWord*)this; |
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size_t hdr = header_size(); |
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Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord); |
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} |
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void FreeChunk::mangleFreed(size_t sz) { |
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assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns"); |
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// mangle all but the header of a just-freed block of storage |
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// just prior to passing it to the storage dictionary |
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assert(sz >= MinChunkSize, "smallest size of object"); |
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assert(sz == size(), "just checking"); |
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HeapWord* addr = (HeapWord*)this; |
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size_t hdr = header_size(); |
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Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord); |
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} |
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void FreeChunk::verifyList() const { |
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FreeChunk* nextFC = next(); |
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if (nextFC != NULL) { |
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assert(this == nextFC->prev(), "broken chain"); |
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assert(size() == nextFC->size(), "wrong size"); |
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nextFC->verifyList(); |
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} |
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} |
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#endif |
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void FreeChunk::print_on(outputStream* st) { |
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st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s", |
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next(), prev(), cantCoalesce() ? "[can't coalesce]" : ""); |
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} |