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305ec3bd3f
Repaired or selectively disabled offending formats; future-proofed with additional checking Reviewed-by: kvn, jrose, stefank
78 lines
2.8 KiB
C++
78 lines
2.8 KiB
C++
/*
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* Copyright (c) 2001, 2014, 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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#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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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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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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}
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