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author | Ben Murdoch <benm@google.com> | 2009-08-11 17:01:47 +0100 |
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committer | Ben Murdoch <benm@google.com> | 2009-08-11 18:21:02 +0100 |
commit | 0bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5 (patch) | |
tree | 2943df35f62d885c89d01063cc528dd73b480fea /JavaScriptCore/bytecompiler/SegmentedVector.h | |
parent | 7e7a70bfa49a1122b2597a1e6367d89eb4035eca (diff) | |
download | external_webkit-0bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5.zip external_webkit-0bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5.tar.gz external_webkit-0bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5.tar.bz2 |
Merge in WebKit r47029.
Diffstat (limited to 'JavaScriptCore/bytecompiler/SegmentedVector.h')
-rw-r--r-- | JavaScriptCore/bytecompiler/SegmentedVector.h | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/JavaScriptCore/bytecompiler/SegmentedVector.h b/JavaScriptCore/bytecompiler/SegmentedVector.h deleted file mode 100644 index bbab04f..0000000 --- a/JavaScriptCore/bytecompiler/SegmentedVector.h +++ /dev/null @@ -1,170 +0,0 @@ -/* - * Copyright (C) 2008 Apple Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of - * its contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY - * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifndef SegmentedVector_h -#define SegmentedVector_h - -#include <wtf/Vector.h> - -namespace JSC { - - // SegmentedVector is just like Vector, but it doesn't move the values - // stored in its buffer when it grows. Therefore, it is safe to keep - // pointers into a SegmentedVector. - template <typename T, size_t SegmentSize> class SegmentedVector { - public: - SegmentedVector() - : m_size(0) - { - m_segments.append(&m_inlineSegment); - } - - ~SegmentedVector() - { - deleteAllSegments(); - } - - size_t size() const { return m_size; } - - T& at(size_t index) - { - if (index < SegmentSize) - return m_inlineSegment[index]; - return segmentFor(index)->at(subscriptFor(index)); - } - - T& operator[](size_t index) - { - return at(index); - } - - T& last() - { - return at(size() - 1); - } - - template <typename U> void append(const U& value) - { - ++m_size; - - if (m_size <= SegmentSize) { - m_inlineSegment.uncheckedAppend(value); - return; - } - - if (!segmentExistsFor(m_size - 1)) - m_segments.append(new Segment); - segmentFor(m_size - 1)->uncheckedAppend(value); - } - - void removeLast() - { - if (m_size <= SegmentSize) - m_inlineSegment.removeLast(); - else - segmentFor(m_size - 1)->removeLast(); - --m_size; - } - - void grow(size_t size) - { - ASSERT(size > m_size); - ensureSegmentsFor(size); - m_size = size; - } - - void clear() - { - deleteAllSegments(); - m_segments.resize(1); - m_inlineSegment.clear(); - m_size = 0; - } - - private: - typedef Vector<T, SegmentSize> Segment; - - void deleteAllSegments() - { - // Skip the first segment, because it's our inline segment, which was - // not created by new. - for (size_t i = 1; i < m_segments.size(); i++) - delete m_segments[i]; - } - - bool segmentExistsFor(size_t index) - { - return index / SegmentSize < m_segments.size(); - } - - Segment* segmentFor(size_t index) - { - return m_segments[index / SegmentSize]; - } - - size_t subscriptFor(size_t index) - { - return index % SegmentSize; - } - - void ensureSegmentsFor(size_t size) - { - size_t segmentCount = m_size / SegmentSize; - if (m_size % SegmentSize) - ++segmentCount; - segmentCount = std::max<size_t>(segmentCount, 1); // We always have at least our inline segment. - - size_t neededSegmentCount = size / SegmentSize; - if (size % SegmentSize) - ++neededSegmentCount; - - // Fill up to N - 1 segments. - size_t end = neededSegmentCount - 1; - for (size_t i = segmentCount - 1; i < end; ++i) - ensureSegment(i, SegmentSize); - - // Grow segment N to accomodate the remainder. - ensureSegment(end, subscriptFor(size - 1) + 1); - } - - void ensureSegment(size_t segmentIndex, size_t size) - { - ASSERT(segmentIndex <= m_segments.size()); - if (segmentIndex == m_segments.size()) - m_segments.append(new Segment); - m_segments[segmentIndex]->grow(size); - } - - size_t m_size; - Segment m_inlineSegment; - Vector<Segment*, 32> m_segments; - }; - -} // namespace JSC - -#endif // SegmentedVector_h |