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/*
* Copyright (C) 2024-2025 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#include "config.h"
#include <wtf/SequesteredMalloc.h>
#include "SequesteredAllocator.h"
#if USE(PROTECTED_JIT)
namespace WTF {
#if ASSERT_ENABLED
namespace {
// We do not use std::numeric_limits<size_t>::max() here due to the edge case in VC++.
// https://bugs.webkit.org/show_bug.cgi?id=173720
static size_t maxSingleSequesteredArenaAllocationSize = SIZE_MAX;
};
void sequesteredArenaSetMaxSingleAllocationSize(size_t size)
{
maxSingleSequesteredArenaAllocationSize = size;
}
#if ASSERT_ENABLED
#define ASSERT_IS_WITHIN_LIMIT(size) do { \
size_t size__ = (size); \
ASSERT_WITH_MESSAGE((size__) <= maxSingleSequesteredArenaAllocationSize, "Requested size (%zu) exceeds max single allocation size set for testing (%zu)", (size__), maxSingleSequesteredArenaAllocationSize); \
} while (false)
#else
#define ASSERT_IS_WITHIN_LIMIT(size)
#endif // ASSERT_ENABLED
#define FAIL_IF_EXCEEDS_LIMIT(size) do { \
if ((size) > maxSingleSequesteredArenaAllocationSize) [[unlikely]] \
return nullptr; \
} while (false)
#else // !ASSERT_ENABLED
#define ASSERT_IS_WITHIN_LIMIT(size)
#define FAIL_IF_EXCEEDS_LIMIT(size)
#endif // !ASSERT_ENABLED
bool isSequesteredArenaMallocEnabled()
{
#if USE(PROTECTED_JIT)
return true;
#else
return false;
#endif
}
void* sequesteredArenaMalloc(size_t size)
{
ASSERT_IS_WITHIN_LIMIT(size);
return SequesteredArenaAllocator::getCurrentAllocator()->malloc(size);
}
void* sequesteredArenaZeroedMalloc(size_t size)
{
ASSERT_IS_WITHIN_LIMIT(size);
return SequesteredArenaAllocator::getCurrentAllocator()->zeroedMalloc(size);
}
void* sequesteredArenaCalloc(size_t numElements, size_t elementSize)
{
ASSERT_IS_WITHIN_LIMIT(numElements * elementSize);
Checked<size_t> checkedSize = elementSize;
checkedSize *= numElements;
void* result = sequesteredArenaZeroedMalloc(checkedSize);
if (!result)
CRASH();
return result;
}
void* sequesteredArenaRealloc(void* object, size_t newSize)
{
ASSERT_IS_WITHIN_LIMIT(newSize);
return SequesteredArenaAllocator::getCurrentAllocator()->realloc(object, newSize);
}
void sequesteredArenaFree(void* object)
{
SequesteredArenaAllocator::getCurrentAllocator()->free(object);
}
TryMallocReturnValue trySequesteredArenaMalloc(size_t size)
{
FAIL_IF_EXCEEDS_LIMIT(size);
return SequesteredArenaAllocator::getCurrentAllocator()->tryMalloc(size);
}
TryMallocReturnValue trySequesteredArenaZeroedMalloc(size_t size)
{
FAIL_IF_EXCEEDS_LIMIT(size);
return SequesteredArenaAllocator::getCurrentAllocator()->tryZeroedMalloc(size);
}
TryMallocReturnValue trySequesteredArenaCalloc(size_t numElements, size_t elementSize)
{
FAIL_IF_EXCEEDS_LIMIT(numElements * elementSize);
CheckedSize checkedSize = elementSize;
checkedSize *= numElements;
if (checkedSize.hasOverflowed())
return nullptr;
return trySequesteredArenaZeroedMalloc(checkedSize);
}
TryMallocReturnValue trySequesteredArenaRealloc(void* object, size_t newSize)
{
FAIL_IF_EXCEEDS_LIMIT(newSize);
return SequesteredArenaAllocator::getCurrentAllocator()->tryRealloc(object, newSize);
}
void* sequesteredArenaAlignedMalloc(size_t alignment, size_t size)
{
ASSERT_IS_WITHIN_LIMIT(size);
return SequesteredArenaAllocator::getCurrentAllocator()->alignedMalloc(alignment, size);
}
void* trySequesteredArenaAlignedMalloc(size_t alignment, size_t size)
{
FAIL_IF_EXCEEDS_LIMIT(size);
return SequesteredArenaAllocator::getCurrentAllocator()->tryAlignedMalloc(alignment, size);
}
void sequesteredArenaAlignedFree(void* p)
{
return SequesteredArenaAllocator::getCurrentAllocator()->free(p);
}
SequesteredArenaMallocStatistics sequesteredArenaMallocStatistics()
{
return { };
}
void sequesteredArenaMallocDumpMallocStats()
{
}
void* sequesteredImmortalMalloc(size_t size)
{
return SequesteredImmortalHeap::instance().immortalMalloc(size);
}
void* sequesteredImmortalAlignedMalloc(size_t alignment, size_t size)
{
return SequesteredImmortalHeap::instance().immortalAlignedMalloc(alignment, size);
}
}
#endif // USE(PROTECTED_JIT)
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