/*
 * Copyright (C) 2013 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * 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.
 */

#include "wtf/Partitions.h"

#include "base/debug/alias.h"
#include "wtf/PartitionAllocator.h"

namespace WTF {

const char* const Partitions::kAllocatedObjectPoolName = "partition_alloc/allocated_objects";

SpinLock Partitions::s_initializationLock;
bool Partitions::s_initialized = false;

PartitionAllocatorGeneric Partitions::m_fastMallocAllocator;
PartitionAllocatorGeneric Partitions::m_bufferAllocator;
#if !ENABLE(OILPAN)
SizeSpecificPartitionAllocator<3328> Partitions::m_nodeAllocator;
#endif
SizeSpecificPartitionAllocator<1024> Partitions::m_layoutAllocator;
Partitions::ReportPartitionAllocSizeFunction Partitions::m_reportSizeFunction = nullptr;

void Partitions::initialize(ReportPartitionAllocSizeFunction reportSizeFunction)
{
    SpinLock::Guard guard(s_initializationLock);

    if (!s_initialized) {
        partitionAllocGlobalInit(&Partitions::handleOutOfMemory);
        m_fastMallocAllocator.init();
        m_bufferAllocator.init();
#if !ENABLE(OILPAN)
        m_nodeAllocator.init();
#endif
        m_layoutAllocator.init();
        m_reportSizeFunction = reportSizeFunction;
        s_initialized = true;
    }
}

void Partitions::shutdown()
{
    SpinLock::Guard guard(s_initializationLock);

    // We could ASSERT here for a memory leak within the partition, but it leads
    // to very hard to diagnose ASSERTs, so it's best to leave leak checking for
    // the valgrind and heapcheck bots, which run without partitions.
    if (s_initialized) {
        (void) m_layoutAllocator.shutdown();
#if !ENABLE(OILPAN)
        (void) m_nodeAllocator.shutdown();
#endif
        (void) m_bufferAllocator.shutdown();
        (void) m_fastMallocAllocator.shutdown();
    }
}

void Partitions::decommitFreeableMemory()
{
    RELEASE_ASSERT(isMainThread());
    if (!s_initialized)
        return;

    partitionPurgeMemoryGeneric(bufferPartition(), PartitionPurgeDecommitEmptyPages);
    partitionPurgeMemoryGeneric(fastMallocPartition(), PartitionPurgeDecommitEmptyPages);
#if !ENABLE(OILPAN)
    partitionPurgeMemory(nodePartition(), PartitionPurgeDecommitEmptyPages);
#endif
    partitionPurgeMemory(layoutPartition(), PartitionPurgeDecommitEmptyPages);
}

void Partitions::reportMemoryUsageHistogram()
{
    static size_t observedMaxSizeInMB = 0;

    if (!m_reportSizeFunction)
        return;
    // We only report the memory in the main thread.
    if (!isMainThread())
        return;
    // +1 is for rounding up the sizeInMB.
    size_t sizeInMB = Partitions::totalSizeOfCommittedPages() / 1024 / 1024 + 1;
    if (sizeInMB > observedMaxSizeInMB) {
        m_reportSizeFunction(sizeInMB);
        observedMaxSizeInMB = sizeInMB;
    }
}

void Partitions::dumpMemoryStats(bool isLightDump, PartitionStatsDumper* partitionStatsDumper)
{
    // Object model and rendering partitions are not thread safe and can be
    // accessed only on the main thread.
    ASSERT(isMainThread());

    decommitFreeableMemory();
    partitionDumpStatsGeneric(fastMallocPartition(), "fast_malloc", isLightDump, partitionStatsDumper);
    partitionDumpStatsGeneric(bufferPartition(), "buffer", isLightDump, partitionStatsDumper);
#if !ENABLE(OILPAN)
    partitionDumpStats(nodePartition(), "node", isLightDump, partitionStatsDumper);
#endif
    partitionDumpStats(layoutPartition(), "layout", isLightDump, partitionStatsDumper);
}

static NEVER_INLINE void partitionsOutOfMemoryUsing2G()
{
    size_t signature = 2UL * 1024 * 1024 * 1024;
    base::debug::Alias(&signature);
    IMMEDIATE_CRASH();
}

static NEVER_INLINE void partitionsOutOfMemoryUsing1G()
{
    size_t signature = 1UL * 1024 * 1024 * 1024;
    base::debug::Alias(&signature);
    IMMEDIATE_CRASH();
}

static NEVER_INLINE void partitionsOutOfMemoryUsing512M()
{
    size_t signature = 512 * 1024 * 1024;
    base::debug::Alias(&signature);
    IMMEDIATE_CRASH();
}

static NEVER_INLINE void partitionsOutOfMemoryUsing256M()
{
    size_t signature = 256 * 1024 * 1024;
    base::debug::Alias(&signature);
    IMMEDIATE_CRASH();
}

static NEVER_INLINE void partitionsOutOfMemoryUsing128M()
{
    size_t signature = 128 * 1024 * 1024;
    base::debug::Alias(&signature);
    IMMEDIATE_CRASH();
}

static NEVER_INLINE void partitionsOutOfMemoryUsing64M()
{
    size_t signature = 64 * 1024 * 1024;
    base::debug::Alias(&signature);
    IMMEDIATE_CRASH();
}

static NEVER_INLINE void partitionsOutOfMemoryUsing32M()
{
    size_t signature = 32 * 1024 * 1024;
    base::debug::Alias(&signature);
    IMMEDIATE_CRASH();
}

static NEVER_INLINE void partitionsOutOfMemoryUsing16M()
{
    size_t signature = 16 * 1024 * 1024;
    base::debug::Alias(&signature);
    IMMEDIATE_CRASH();
}

static NEVER_INLINE void partitionsOutOfMemoryUsingLessThan16M()
{
    size_t signature = 16 * 1024 * 1024 - 1;
    base::debug::Alias(&signature);
    DLOG(FATAL) << "ParitionAlloc: out of memory with < 16M usage (error:" << getAllocPageErrorCode() << ")";
}

void Partitions::handleOutOfMemory()
{
    volatile size_t totalUsage = totalSizeOfCommittedPages();
    uint32_t allocPageErrorCode = getAllocPageErrorCode();
    base::debug::Alias(&allocPageErrorCode);

    if (totalUsage >= 2UL * 1024 * 1024 * 1024)
        partitionsOutOfMemoryUsing2G();
    if (totalUsage >= 1UL * 1024 * 1024 * 1024)
        partitionsOutOfMemoryUsing1G();
    if (totalUsage >= 512 * 1024 * 1024)
        partitionsOutOfMemoryUsing512M();
    if (totalUsage >= 256 * 1024 * 1024)
        partitionsOutOfMemoryUsing256M();
    if (totalUsage >= 128 * 1024 * 1024)
        partitionsOutOfMemoryUsing128M();
    if (totalUsage >= 64 * 1024 * 1024)
        partitionsOutOfMemoryUsing64M();
    if (totalUsage >= 32 * 1024 * 1024)
        partitionsOutOfMemoryUsing32M();
    if (totalUsage >= 16 * 1024 * 1024)
        partitionsOutOfMemoryUsing16M();
    partitionsOutOfMemoryUsingLessThan16M();
}

} // namespace WTF