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/*
* 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 "CellSize.h"
#include "VMInspector.h"
#include <wtf/Assertions.h>
namespace JSC {
#define AUDIT_CONDITION(x) (x), #x
#define AUDIT_VERIFY(action, verifier, cond, ...) do { \
if (action == VerifierAction::ReleaseAssert) \
RELEASE_ASSERT(cond, __VA_ARGS__); \
else if (!verifier(AUDIT_CONDITION(cond), __VA_ARGS__)) \
return false; \
} while (false)
template<VMInspector::VerifierAction action, VMInspector::VerifyFunctor verifier>
bool VMInspector::verifyCellSize(VM& vm, JSCell* cell, size_t allocatorCellSize)
{
Structure* structure = cell->structure(vm);
const ClassInfo* classInfo = structure->classInfo();
JSType cellType = cell->type();
AUDIT_VERIFY(action, verifier, cellType == structure->m_blob.type(), cell, cellType, structure->m_blob.type());
size_t size = cellSize(vm, cell);
AUDIT_VERIFY(action, verifier, size <= allocatorCellSize, cell, cellType, size, allocatorCellSize, classInfo->staticClassSize);
if (isDynamicallySizedType(cellType))
AUDIT_VERIFY(action, verifier, size >= classInfo->staticClassSize, cell, cellType, size, classInfo->staticClassSize);
return true;
}
template<VMInspector::VerifierAction action, VMInspector::VerifyFunctor verifier>
bool VMInspector::verifyCell(VM& vm, JSCell* cell)
{
size_t allocatorCellSize = 0;
if (cell->isPreciseAllocation()) {
PreciseAllocation& preciseAllocation = cell->preciseAllocation();
AUDIT_VERIFY(action, verifier, &preciseAllocation.vm() == &vm, cell, cell->type(), &preciseAllocation.vm(), &vm);
bool isValidPreciseAllocation = false;
for (auto* i : vm.heap.objectSpace().preciseAllocations()) {
if (i == &preciseAllocation) {
isValidPreciseAllocation = true;
break;
}
}
AUDIT_VERIFY(action, verifier, isValidPreciseAllocation, cell, cell->type());
allocatorCellSize = preciseAllocation.cellSize();
} else {
MarkedBlock& block = cell->markedBlock();
MarkedBlock::Handle& blockHandle = block.handle();
AUDIT_VERIFY(action, verifier, &block.vm() == &vm, cell, cell->type(), &block.vm(), &vm);
uintptr_t blockStartAddress = reinterpret_cast<uintptr_t>(blockHandle.start());
AUDIT_VERIFY(action, verifier, blockHandle.contains(cell), cell, cell->type(), blockStartAddress, blockHandle.end());
uintptr_t cellAddress = reinterpret_cast<uintptr_t>(cell);
uintptr_t cellOffset = cellAddress - blockStartAddress;
allocatorCellSize = block.cellSize();
bool cellIsProperlyAligned = !(cellOffset % allocatorCellSize);
AUDIT_VERIFY(action, verifier, cellIsProperlyAligned, cell, cell->type(), allocatorCellSize);
}
auto cellType = cell->type();
if (cell->type() != JSImmutableButterflyType)
AUDIT_VERIFY(action, verifier, !Gigacage::contains(cell), cell, cellType);
if (!verifyCellSize<action, verifier>(vm, cell, allocatorCellSize))
return false;
if (Gigacage::isEnabled(Gigacage::JSValue) && cell->isObject()) {
JSObject* object = asObject(cell);
const Butterfly* butterfly = object->butterfly();
AUDIT_VERIFY(action, verifier, !butterfly || Gigacage::isCaged(Gigacage::JSValue, butterfly), cell, cell->type(), butterfly);
}
return true;
}
#undef AUDIT_VERIFY
#undef AUDIT_CONDITION
} // namespace JSC
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