mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-07 09:21:41 +00:00
93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
/*
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* Copyright (C) 2016-2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "FreeList.h"
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namespace JSC {
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FreeList::FreeList(unsigned cellSize)
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: m_cellSize(cellSize)
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{
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}
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FreeList::~FreeList()
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{
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}
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void FreeList::clear()
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{
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m_scrambledHead = 0;
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m_secret = 0;
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m_payloadEnd = nullptr;
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m_remaining = 0;
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m_originalSize = 0;
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}
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void FreeList::initializeList(FreeCell* head, uintptr_t secret, unsigned bytes)
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{
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// It's *slightly* more optimal to use a scrambled head. It saves a register on the fast path.
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m_scrambledHead = FreeCell::scramble(head, secret);
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m_secret = secret;
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m_payloadEnd = nullptr;
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m_remaining = 0;
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m_originalSize = bytes;
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}
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void FreeList::initializeBump(char* payloadEnd, unsigned remaining)
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{
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m_scrambledHead = 0;
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m_secret = 0;
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m_payloadEnd = payloadEnd;
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m_remaining = remaining;
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m_originalSize = remaining;
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}
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bool FreeList::contains(HeapCell* target) const
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{
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if (m_remaining) {
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const void* start = (m_payloadEnd - m_remaining);
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const void* end = m_payloadEnd;
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return (start <= target) && (target < end);
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}
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FreeCell* candidate = head();
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while (candidate) {
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if (bitwise_cast<HeapCell*>(candidate) == target)
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return true;
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candidate = candidate->next(m_secret);
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}
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return false;
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}
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void FreeList::dump(PrintStream& out) const
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{
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out.print("{head = ", RawPointer(head()), ", secret = ", m_secret, ", payloadEnd = ", RawPointer(m_payloadEnd), ", remaining = ", m_remaining, ", originalSize = ", m_originalSize, "}");
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}
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} // namespace JSC
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