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/*
* Copyright (C) 2019-2023 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 "Gate.h"
#include "Opcode.h"
#include "OptionsList.h"
#include "SecureARM64EHashPins.h"
#include <wtf/WTFConfig.h>
namespace JSC {
class ExecutableAllocator;
class FixedVMPoolExecutableAllocator;
class VM;
#if ENABLE(SEPARATED_WX_HEAP)
using JITWriteSeparateHeapsFunction = void (*)(off_t, const void*, size_t);
#endif
struct Config {
static Config& singleton();
static void disableFreezingForTesting() { g_wtfConfig.disableFreezingForTesting(); }
JS_EXPORT_PRIVATE static void enableRestrictedOptions();
static void finalize() { WTF::Config::finalize(); }
static void configureForTesting()
{
WTF::setPermissionsOfConfigPage();
disableFreezingForTesting();
enableRestrictedOptions();
}
bool isPermanentlyFrozen() { return g_wtfConfig.isPermanentlyFrozen; }
// 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.
// FIXME: We should use a placement new constructor from JSC::initialize so we can use default initializers.
bool restrictedOptionsEnabled;
bool jitDisabled;
bool vmCreationDisallowed;
bool vmEntryDisallowed;
bool useFastJITPermissions;
// The following HasBeenCalled flags are for auditing call_once initialization functions.
bool initializeHasBeenCalled;
struct {
#if ASSERT_ENABLED
bool canUseJITIsSet;
#endif
bool canUseJIT;
} vm;
#if CPU(ARM64E)
bool canUseFPAC;
#endif
ExecutableAllocator* executableAllocator;
FixedVMPoolExecutableAllocator* fixedVMPoolExecutableAllocator;
void* startExecutableMemory;
void* endExecutableMemory;
uintptr_t startOfFixedWritableMemoryPool;
uintptr_t startOfStructureHeap;
uintptr_t sizeOfStructureHeap;
void* defaultCallThunk;
void* arityFixupThunk;
#if ENABLE(SEPARATED_WX_HEAP)
JITWriteSeparateHeapsFunction jitWriteSeparateHeaps;
#endif
OptionsStorage options;
void (*shellTimeoutCheckCallback)(VM&);
struct {
uint8_t exceptionInstructions[maxBytecodeStructLength + 1];
uint8_t wasmExceptionInstructions[maxBytecodeStructLength + 1];
const void* gateMap[numberOfGates];
} llint;
#if CPU(ARM64E) && ENABLE(PTRTAG_DEBUGGING)
WTF::PtrTagLookup ptrTagLookupRecord;
#endif
#if CPU(ARM64E) && ENABLE(JIT)
SecureARM64EHashPins arm64eHashPins;
#endif
};
constexpr size_t alignmentOfJSCConfig = std::alignment_of<JSC::Config>::value;
static_assert(WTF::offsetOfWTFConfigExtension + sizeof(JSC::Config) <= WTF::ConfigSizeToProtect);
static_assert(roundUpToMultipleOf<alignmentOfJSCConfig>(WTF::offsetOfWTFConfigExtension) == WTF::offsetOfWTFConfigExtension);
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
// Workaround to localize bounds safety warnings to this file.
// FIXME: Use real types to make materializing JSC::Config* bounds-safe and type-safe.
inline Config* addressOfJSCConfig() { return std::bit_cast<Config*>(&g_wtfConfig.spaceForExtensions); }
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#define g_jscConfig (*JSC::addressOfJSCConfig())
constexpr size_t offsetOfJSCConfigInitializeHasBeenCalled = offsetof(JSC::Config, initializeHasBeenCalled);
constexpr size_t offsetOfJSCConfigGateMap = offsetof(JSC::Config, llint.gateMap);
constexpr size_t offsetOfJSCConfigStartOfStructureHeap = offsetof(JSC::Config, startOfStructureHeap);
constexpr size_t offsetOfJSCConfigDefaultCallThunk = offsetof(JSC::Config, defaultCallThunk);
ALWAYS_INLINE PURE_FUNCTION uintptr_t startOfStructureHeap()
{
return g_jscConfig.startOfStructureHeap;
}
} // namespace JSC
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