Source/WebKit/UIProcess/Cocoa/VersionChecks.mm

/*
 * Copyright (C) 2015-2017 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 "VersionChecks.h"

#import <WebCore/RuntimeApplicationChecks.h>
#import <mach-o/dyld.h>
#import <mutex>

namespace WebKit {

static NSString * const WebKitLinkedOnOrAfterEverythingKey = @"WebKitLinkedOnOrAfterEverything";

bool linkedOnOrAfter(SDKVersion sdkVersion, AssumeSafariIsAlwaysLinkedOnAfter assumeSafariIsAlwaysLinkedOnAfter)
{
    static bool linkedOnOrAfterEverything = false;
    static bool isSafari = false;
    static std::once_flag once;
    std::call_once(once, [] {
#if PLATFORM(IOS_FAMILY)
        if (WebCore::IOSApplication::isMobileSafari())
            isSafari = true;
#elif PLATFORM(MAC)
        if (WebCore::MacApplication::isSafari())
            isSafari = true;
#endif

        if ([[NSUserDefaults standardUserDefaults] boolForKey:WebKitLinkedOnOrAfterEverythingKey])
            linkedOnOrAfterEverything = true;
    });

    if (UNLIKELY(linkedOnOrAfterEverything))
        return true;

    if (isSafari && assumeSafariIsAlwaysLinkedOnAfter == AssumeSafariIsAlwaysLinkedOnAfter::Yes)
        return true;

    auto sdkVersionAsInteger = static_cast<uint32_t>(sdkVersion);
    return sdkVersionAsInteger && dyld_get_program_sdk_version() >= sdkVersionAsInteger;
}

}