mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*
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* Copyright (C) 2019-2020 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 "Integrity.h"
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#include "VM.h"
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namespace JSC {
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namespace Integrity {
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ALWAYS_INLINE bool Random::shouldAudit(VM& vm)
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{
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// If auditing is enabled, then the top bit of m_triggerBits is always set
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// to 1 on reload. When this top bit reaches the bottom, it does not
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// indicate that we should trigger an audit but rather that we've shifted
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// out all the available trigger bits and hence, need to reload. Instead,
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// reloadAndCheckShouldAuditSlow() will return whether we actually need to
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// trigger an audit this turn.
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//
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// This function can be called concurrently from different threads and can
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// be racy. For that reason, we intentionally do not write back to
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// m_triggerBits if newTriggerBits is null. This ensures that if
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// Options::randomIntegrityAuditRate() is non-zero, then m_triggerBits will
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// always have at least 1 bit to trigger a reload.
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uint64_t newTriggerBits = m_triggerBits;
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bool shouldAudit = newTriggerBits & 1;
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newTriggerBits = newTriggerBits >> 1;
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if (LIKELY(!shouldAudit)) {
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m_triggerBits = newTriggerBits;
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return false;
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}
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if (!newTriggerBits)
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return reloadAndCheckShouldAuditSlow(vm);
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m_triggerBits = newTriggerBits;
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return true;
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}
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ALWAYS_INLINE void auditCellMinimally(VM& vm, JSCell* cell)
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{
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if (UNLIKELY(Gigacage::contains(cell)))
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auditCellMinimallySlow(vm, cell);
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}
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ALWAYS_INLINE void auditCellRandomly(VM& vm, JSCell* cell)
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{
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if (UNLIKELY(vm.integrityRandom().shouldAudit(vm)))
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auditCellFully(vm, cell);
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}
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ALWAYS_INLINE void auditStructureID(StructureIDTable& table, StructureID id)
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{
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table.validate(id);
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}
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ALWAYS_INLINE void auditStructureID(VM& vm, StructureID id)
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{
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auditStructureID(vm.heap.structureIDTable(), id);
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}
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} // namespace Integrity
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} // namespace JSC
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