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/*
* Copyright (C) 2022-2024 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.
*/
#include "config.h"
#include "JSCBytecodeCacheVersion.h"
#include <wtf/text/SuperFastHash.h>
#if OS(DARWIN)
#include <dlfcn.h>
#include <mach-o/dyld.h>
#include <uuid/uuid.h>
#include <wtf/DataLog.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/spi/darwin/dyldSPI.h>
#endif
namespace JSC {
#if OS(DARWIN)
namespace JSCBytecodeCacheVersionInternal {
static constexpr bool verbose = false;
}
#endif
uint32_t computeJSCBytecodeCacheVersion()
{
#if OS(DARWIN)
static LazyNeverDestroyed<uint32_t> cacheVersion;
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
void* jsFunctionAddr = bitwise_cast<void*>(&computeJSCBytecodeCacheVersion);
uuid_t uuid;
if (const mach_header* header = dyld_image_header_containing_address(jsFunctionAddr); header && _dyld_get_image_uuid(header, uuid)) {
uuid_string_t uuidString = { };
uuid_unparse(uuid, uuidString);
cacheVersion.construct(SuperFastHash::computeHash(uuidString));
dataLogLnIf(JSCBytecodeCacheVersionInternal::verbose, "UUID of JavaScriptCore.framework:", uuidString);
return;
}
cacheVersion.construct(0);
dataLogLnIf(JSCBytecodeCacheVersionInternal::verbose, "Failed to get UUID for JavaScriptCore framework");
});
return cacheVersion.get();
#else
static constexpr uint32_t precomputedCacheVersion = SuperFastHash::computeHash(__TIMESTAMP__);
return precomputedCacheVersion;
#endif
}
} // namespace JSC
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