third_party/WebKit/Source/platform/exported/Platform.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * in the documentation and/or other materials provided with the
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "base/threading/thread_task_runner_handle.h"
#include "base/trace_event/memory_dump_manager.h"
#include "platform/Histogram.h"
#include "platform/MemoryCacheDumpProvider.h"
#include "platform/PartitionAllocMemoryDumpProvider.h"
#include "platform/fonts/FontCacheMemoryDumpProvider.h"
#include "platform/heap/BlinkGCMemoryDumpProvider.h"
#include "platform/heap/GCTaskRunner.h"
#include "public/platform/Platform.h"
#include "public/platform/ServiceRegistry.h"
#include "public/platform/WebPrerenderingSupport.h"
#include "wtf/HashMap.h"

namespace blink {

static Platform* s_platform = nullptr;

static GCTaskRunner* s_gcTaskRunner = nullptr;

Platform::Platform()
    : m_mainThread(0)
{
}

static void maxObservedSizeFunction(size_t sizeInMB)
{
    const size_t supportedMaxSizeInMB = 4 * 1024;
    if (sizeInMB >= supportedMaxSizeInMB)
        sizeInMB = supportedMaxSizeInMB - 1;

    // Send a UseCounter only when we see the highest memory usage
    // we've ever seen.
    DEFINE_STATIC_LOCAL(EnumerationHistogram, committedSizeHistogram, ("PartitionAlloc.CommittedSize", supportedMaxSizeInMB));
    committedSizeHistogram.count(sizeInMB);
}

static void callOnMainThreadFunction(WTF::MainThreadFunction function, void* context)
{
    Platform::current()->mainThread()->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(function, AllowCrossThreadAccess(context)));
}

void Platform::initialize(Platform* platform)
{
    ASSERT(!s_platform);
    ASSERT(platform);
    s_platform = platform;
    s_platform->m_mainThread = platform->currentThread();

    WTF::Partitions::initialize(maxObservedSizeFunction);
    WTF::initialize(callOnMainThreadFunction);

    ProcessHeap::init();
    if (base::ThreadTaskRunnerHandle::IsSet())
        base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(BlinkGCMemoryDumpProvider::instance(), "BlinkGC", base::ThreadTaskRunnerHandle::Get());

    ThreadState::attachMainThread();

    // TODO(ssid): remove this check after fixing crbug.com/486782.
    if (s_platform->m_mainThread) {
        ASSERT(!s_gcTaskRunner);
        s_gcTaskRunner = new GCTaskRunner(s_platform->m_mainThread);
        base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(PartitionAllocMemoryDumpProvider::instance(), "PartitionAlloc", base::ThreadTaskRunnerHandle::Get());
        base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(FontCacheMemoryDumpProvider::instance(), "FontCaches", base::ThreadTaskRunnerHandle::Get());
        base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(MemoryCacheDumpProvider::instance(), "MemoryCache", base::ThreadTaskRunnerHandle::Get());
    }
}

void Platform::shutdown()
{
    ASSERT(isMainThread());
    if (s_platform->m_mainThread) {
        base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(FontCacheMemoryDumpProvider::instance());
        base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(PartitionAllocMemoryDumpProvider::instance());
        base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(BlinkGCMemoryDumpProvider::instance());
        base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(MemoryCacheDumpProvider::instance());

        ASSERT(s_gcTaskRunner);
        delete s_gcTaskRunner;
        s_gcTaskRunner = nullptr;
    }

    // Detach the main thread before starting the shutdown sequence
    // so that the main thread won't get involved in a GC during the shutdown.
    ThreadState::detachMainThread();

    ProcessHeap::shutdown();

    WTF::shutdown();
    WTF::Partitions::shutdown();

    s_platform->m_mainThread = nullptr;
    s_platform = nullptr;
}

void Platform::setCurrentPlatformForTesting(Platform* platform)
{
    ASSERT(platform);
    s_platform = platform;
    s_platform->m_mainThread = platform->currentThread();
}

Platform* Platform::current()
{
    return s_platform;
}

WebThread* Platform::mainThread() const
{
    return m_mainThread;
}

ServiceRegistry* Platform::serviceRegistry()
{
    return ServiceRegistry::getEmptyServiceRegistry();
}

} // namespace blink