blob: aa9bfe6c6184420e62af647e82b39e16c2595baf [file] [log] [blame]
/*
* Copyright (C) 2019 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.
*/
#pragma once
#include "OptionsList.h"
#include <wtf/PageBlock.h>
#include <wtf/StdLibExtras.h>
namespace JSC {
class ExecutableAllocator;
class FixedVMPoolExecutableAllocator;
class VM;
constexpr size_t ConfigSizeToProtect = CeilingOnPageSize;
#if ENABLE(SEPARATED_WX_HEAP)
using JITWriteSeparateHeapsFunction = void (*)(off_t, const void*, size_t);
#endif
struct Config {
JS_EXPORT_PRIVATE static void disableFreezingForTesting();
JS_EXPORT_PRIVATE static void enableRestrictedOptions();
JS_EXPORT_PRIVATE static void permanentlyFreeze();
static void configureForTesting()
{
disableFreezingForTesting();
enableRestrictedOptions();
}
union {
struct {
// All the fields in this struct should be chosen such that their
// initial value is 0 / null / falsy because Config is instantiated
// as a global singleton.
bool isPermanentlyFrozen;
bool disabledFreezingForTesting;
bool restrictedOptionsEnabled;
bool jitDisabled;
// The following HasBeenCalled flags are for auditing call_once initialization functions.
bool initializeThreadingHasBeenCalled;
ExecutableAllocator* executableAllocator;
FixedVMPoolExecutableAllocator* fixedVMPoolExecutableAllocator;
void* startExecutableMemory;
void* endExecutableMemory;
uintptr_t startOfFixedWritableMemoryPool;
#if ENABLE(SEPARATED_WX_HEAP)
JITWriteSeparateHeapsFunction jitWriteSeparateHeaps;
bool useFastPermisionsJITCopy;
#endif
OptionsStorage options;
void (*shellTimeoutCheckCallback)(VM&);
};
char ensureSize[ConfigSizeToProtect];
};
};
extern "C" alignas(ConfigSizeToProtect) JS_EXPORT_PRIVATE Config g_jscConfig;
static_assert(sizeof(Config) == ConfigSizeToProtect, "");
} // namespace JSC