MarkedAllocatorInlines.h   [plain text]

/*
 * Copyright (C) 2017 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
 * 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. 
 */

#pragma once

#include "MarkedAllocator.h"

namespace JSC {

ALWAYS_INLINE void* MarkedAllocator::tryAllocate(GCDeferralContext* deferralContext)
{
    unsigned remaining = m_freeList.remaining;
    if (remaining) {
        unsigned cellSize = m_cellSize;
        remaining -= cellSize;
        m_freeList.remaining = remaining;
        return m_freeList.payloadEnd - remaining - cellSize;
    }
    
    FreeCell* head = m_freeList.head;
    if (UNLIKELY(!head))
        return tryAllocateSlowCase(deferralContext);
    
    m_freeList.head = head->next;
    return head;
}

ALWAYS_INLINE void* MarkedAllocator::allocate(GCDeferralContext* deferralContext)
{
    unsigned remaining = m_freeList.remaining;
    if (remaining) {
        unsigned cellSize = m_cellSize;
        remaining -= cellSize;
        m_freeList.remaining = remaining;
        return m_freeList.payloadEnd - remaining - cellSize;
    }
    
    FreeCell* head = m_freeList.head;
    if (UNLIKELY(!head))
        return allocateSlowCase(deferralContext);
    
    m_freeList.head = head->next;
    return head;
}

template <typename Functor> inline void MarkedAllocator::forEachBlock(const Functor& functor)
{
    m_live.forEachSetBit(
        [&] (size_t index) {
            functor(m_blocks[index]);
        });
}

template <typename Functor> inline void MarkedAllocator::forEachNotEmptyBlock(const Functor& functor)
{
    m_markingNotEmpty.forEachSetBit(
        [&] (size_t index) {
            functor(m_blocks[index]);
        });
}

} // namespace JSC