author | jmasa |
Tue, 12 Feb 2013 14:15:45 -0800 | |
changeset 17109 | 90e6c31bbbe4 |
parent 17101 | 3a82a58d9aa9 |
child 20729 | 0a687ee7097d |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 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 "memory/allocation.hpp" |
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#include "memory/metachunk.hpp" |
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#include "utilities/copy.hpp" |
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#include "utilities/debug.hpp" |
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class VirtualSpaceNode; |
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// |
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// Future modification |
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// |
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// The Metachunk can conceivable be replaced by the Chunk in |
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// allocation.hpp. Note that the latter Chunk is the space for |
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// allocation (allocations from the chunk are out of the space in |
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// the Chunk after the header for the Chunk) where as Metachunks |
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// point to space in a VirtualSpace. To replace Metachunks with |
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// Chunks, change Chunks so that they can be allocated out of a VirtualSpace. |
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|
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const size_t metadata_chunk_initialize = 0xf7f7f7f7; |
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|
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size_t Metachunk::_overhead = |
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Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord; |
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|
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// Metachunk methods |
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Metachunk::Metachunk(size_t word_size, |
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VirtualSpaceNode* container) : |
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_word_size(word_size), |
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_bottom(NULL), |
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_end(NULL), |
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_top(NULL), |
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_next(NULL), |
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_prev(NULL), |
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_container(container) |
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{ |
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_bottom = (MetaWord*)this; |
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_top = (MetaWord*)this + _overhead; |
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_end = (MetaWord*)this + word_size; |
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#ifdef ASSERT |
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set_is_free(false); |
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size_t data_word_size = pointer_delta(end(), |
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top(), |
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sizeof(MetaWord)); |
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Copy::fill_to_words((HeapWord*) top(), |
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data_word_size, |
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metadata_chunk_initialize); |
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#endif |
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} |
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MetaWord* Metachunk::allocate(size_t word_size) { |
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MetaWord* result = NULL; |
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// If available, bump the pointer to allocate. |
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if (free_word_size() >= word_size) { |
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result = _top; |
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_top = _top + word_size; |
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} |
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return result; |
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} |
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// _bottom points to the start of the chunk including the overhead. |
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size_t Metachunk::used_word_size() const { |
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return pointer_delta(_top, _bottom, sizeof(MetaWord)); |
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} |
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size_t Metachunk::free_word_size() const { |
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return pointer_delta(_end, _top, sizeof(MetaWord)); |
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} |
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size_t Metachunk::capacity_word_size() const { |
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return pointer_delta(_end, _bottom, sizeof(MetaWord)); |
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} |
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void Metachunk::print_on(outputStream* st) const { |
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st->print_cr("Metachunk:" |
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" bottom " PTR_FORMAT " top " PTR_FORMAT |
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" end " PTR_FORMAT " size " SIZE_FORMAT, |
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bottom(), top(), end(), word_size()); |
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if (Verbose) { |
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st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT, |
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used_word_size(), free_word_size()); |
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} |
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} |
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|
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#ifndef PRODUCT |
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void Metachunk::mangle() { |
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// Mangle the payload of the chunk and not the links that |
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// maintain list of chunks. |
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HeapWord* start = (HeapWord*)(bottom() + overhead()); |
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size_t word_size = capacity_word_size() - overhead(); |
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Copy::fill_to_words(start, word_size, metadata_chunk_initialize); |
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} |
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#endif // PRODUCT |
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|
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void Metachunk::verify() { |
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#ifdef ASSERT |
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// Cannot walk through the blocks unless the blocks have |
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// headers with sizes. |
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assert(_bottom <= _top && |
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_top <= _end, |
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"Chunk has been smashed"); |
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#endif |
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return; |
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} |