131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
/*
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* Copyright (C) 2020 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 "Algorithm.h"
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#include "GigacageKind.h"
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#include "StdLibExtras.h"
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#include <inttypes.h>
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#if BENABLE(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" Slot g_config[];
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} // namespace WebConfig
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#endif // BENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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namespace Gigacage {
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struct Config {
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void* basePtr(Kind kind) const
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{
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RELEASE_BASSERT(kind < NumberOfKinds);
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return basePtrs[kind];
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}
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void setBasePtr(Kind kind, void* ptr)
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{
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RELEASE_BASSERT(kind < NumberOfKinds);
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basePtrs[kind] = ptr;
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}
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void* allocBasePtr(Kind kind) const
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{
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RELEASE_BASSERT(kind < NumberOfKinds);
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return allocBasePtrs[kind];
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}
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void setAllocBasePtr(Kind kind, void* ptr)
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{
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RELEASE_BASSERT(kind < NumberOfKinds);
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allocBasePtrs[kind] = ptr;
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}
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size_t allocSize(Kind kind) const
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{
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RELEASE_BASSERT(kind < NumberOfKinds);
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return allocSizes[kind];
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}
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void setAllocSize(Kind kind, size_t size)
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{
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RELEASE_BASSERT(kind < NumberOfKinds);
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allocSizes[kind] = size;
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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; // Will be set by the client if the Config gets frozen.
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bool isEnabled;
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bool disablingPrimitiveGigacageIsForbidden;
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bool shouldBeEnabled;
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// We would like to just put the std::once_flag for these functions
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// here, but we can't because std::once_flag has a implicitly-deleted
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// default constructor. So, we use a boolean instead.
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bool shouldBeEnabledHasBeenCalled;
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bool ensureGigacageHasBeenCalled;
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void* start;
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size_t totalSize;
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void* basePtrs[NumberOfKinds];
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void* allocBasePtrs[NumberOfKinds];
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size_t allocSizes[NumberOfKinds];
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};
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#if BENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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constexpr size_t startSlotOfGigacageConfig = 0;
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constexpr size_t startOffsetOfGigacageConfig = startSlotOfGigacageConfig * sizeof(WebConfig::Slot);
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constexpr size_t reservedSlotsForGigacageConfig = 10;
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constexpr size_t reservedBytesForGigacageConfig = reservedSlotsForGigacageConfig * sizeof(WebConfig::Slot);
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constexpr size_t alignmentOfGigacageConfig = std::alignment_of<Gigacage::Config>::value;
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static_assert(sizeof(Gigacage::Config) <= reservedBytesForGigacageConfig);
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static_assert(bmalloc::roundUpToMultipleOf<alignmentOfGigacageConfig>(startOffsetOfGigacageConfig) == startOffsetOfGigacageConfig);
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#define g_gigacageConfig (*bmalloc::bitwise_cast<Gigacage::Config*>(&WebConfig::g_config[Gigacage::startSlotOfGigacageConfig]))
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#else // not BENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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extern "C" BEXPORT Config g_gigacageConfig;
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#endif // BENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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} // namespace Gigacage
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#if !BENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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using Gigacage::g_gigacageConfig;
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#endif
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