130 lines
4.2 KiB
C++
130 lines
4.2 KiB
C++
/*
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* Copyright (C) 2020-2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/Assertions.h>
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#include <wtf/Atomics.h>
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#include <wtf/ExportMacros.h>
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#include <wtf/PageBlock.h>
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#include <wtf/PtrTag.h>
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#include <wtf/StdLibExtras.h>
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#include <wtf/threads/Signals.h>
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#if defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC
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namespace Gigacage {
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constexpr size_t reservedSlotsForGigacageConfig = 0;
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constexpr size_t reservedBytesForGigacageConfig = 0;
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}
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#else
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#include <bmalloc/GigacageConfig.h>
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#endif
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#if ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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namespace WebConfig {
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using Slot = uint64_t;
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extern "C" WTF_EXPORT_PRIVATE Slot g_config[];
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} // namespace WebConfig
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#endif // ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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namespace WTF {
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constexpr size_t ConfigAlignment = CeilingOnPageSize;
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constexpr size_t ConfigSizeToProtect = std::max(CeilingOnPageSize, 16 * KB);
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struct Config {
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WTF_EXPORT_PRIVATE static void permanentlyFreeze();
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struct AssertNotFrozenScope {
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AssertNotFrozenScope();
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~AssertNotFrozenScope();
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};
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// All the fields in this struct should be chosen such that their
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// initial value is 0 / null / falsy because Config is instantiated
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// as a global singleton.
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bool isPermanentlyFrozen;
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#if PLATFORM(COCOA)
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bool disableForwardingVPrintfStdErrToOSLog;
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#endif
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#if USE(PTHREADS)
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bool isUserSpecifiedThreadSuspendResumeSignalConfigured;
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bool isThreadSuspendResumeSignalConfigured;
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int sigThreadSuspendResume;
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#endif
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#if OS(UNIX)
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SignalHandlers signalHandlers;
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#endif
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PtrTagLookup* ptrTagLookupHead;
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uint64_t spaceForExtensions[1];
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};
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#if ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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constexpr size_t startSlotOfWTFConfig = Gigacage::reservedSlotsForGigacageConfig;
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constexpr size_t startOffsetOfWTFConfig = startSlotOfWTFConfig * sizeof(WebConfig::Slot);
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constexpr size_t offsetOfWTFConfigExtension = startOffsetOfWTFConfig + offsetof(WTF::Config, spaceForExtensions);
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constexpr size_t alignmentOfWTFConfig = std::alignment_of<WTF::Config>::value;
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static_assert(Gigacage::reservedBytesForGigacageConfig + sizeof(WTF::Config) <= ConfigSizeToProtect);
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static_assert(roundUpToMultipleOf<alignmentOfWTFConfig>(startOffsetOfWTFConfig) == startOffsetOfWTFConfig);
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WTF_EXPORT_PRIVATE void setPermissionsOfConfigPage();
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#define g_wtfConfig (*bitwise_cast<WTF::Config*>(&WebConfig::g_config[WTF::startSlotOfWTFConfig]))
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#else // not ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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inline void setPermissionsOfConfigPage() { }
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extern "C" WTF_EXPORT_PRIVATE Config g_wtfConfig;
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#endif // ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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ALWAYS_INLINE Config::AssertNotFrozenScope::AssertNotFrozenScope()
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{
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RELEASE_ASSERT(!g_wtfConfig.isPermanentlyFrozen);
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compilerFence();
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};
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ALWAYS_INLINE Config::AssertNotFrozenScope::~AssertNotFrozenScope()
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{
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compilerFence();
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RELEASE_ASSERT(!g_wtfConfig.isPermanentlyFrozen);
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};
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} // namespace WTF
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#if !ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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using WTF::g_wtfConfig;
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#endif
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