Source/WebKit/Shared/Cocoa/WebKit2InitializeCocoa.mm

/*
 * 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. 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 INC. 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.
 */

#import "config.h"
#import "WebKit2Initialize.h"

#import <JavaScriptCore/InitializeThreading.h>
#import <WebCore/VersionChecks.h>
#import <WebCore/WebCoreJITOperations.h>
#import <mutex>
#import <wtf/MainThread.h>
#import <wtf/RefCounted.h>
#import <wtf/WorkQueue.h>

#if PLATFORM(IOS_FAMILY)
#import <WebCore/WebCoreThreadSystemInterface.h>
#endif

namespace WebKit {

static std::once_flag flag;

static void runInitializationCode(void* = nullptr)
{
    RELEASE_ASSERT_WITH_MESSAGE([NSThread isMainThread], "InitializeWebKit2 should be called on the main thread");

    AtomString::init();
#if PLATFORM(IOS_FAMILY)
    InitWebCoreThreadSystemInterface();
#endif

    JSC::initialize();
    WTF::initializeMainThread();

    WTF::RefCountedBase::enableThreadingChecksGlobally();

    WebCore::populateJITOperations();
}

void InitializeWebKit2()
{
    // Make sure the initialization code is run only once and on the main thread since things like initializeMainThread()
    // are only safe to call on the main thread.
    std::call_once(flag, [] {
        if ([NSThread isMainThread] || linkedOnOrAfter(WebCore::SDKVersion::FirstWithInitializeWebKit2MainThreadAssertion))
            runInitializationCode();
        else
            WorkQueue::main().dispatchSync([] { runInitializationCode(); });
    });
}

}