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/*
* Copyright (C) 2019-2024 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 "SharedMemory.h"
#include "SharedBuffer.h"
#include <wtf/StdLibExtras.h>
#include <wtf/text/ParsingUtilities.h>
namespace WebCore {
bool isMemoryAttributionDisabled()
{
static bool result = []() {
auto value = unsafeSpan(getenv("WEBKIT_DISABLE_MEMORY_ATTRIBUTION"));
if (!value.data())
return false;
return equalSpans(value, "1"_span);
}();
return result;
}
SharedMemoryHandle::SharedMemoryHandle(SharedMemoryHandle::Type&& handle, uint64_t size)
: m_handle(WTFMove(handle))
, m_size(size)
{
RELEASE_ASSERT(!!m_handle);
}
RefPtr<SharedMemory> SharedMemory::copyBuffer(const FragmentedSharedBuffer& buffer)
{
if (buffer.isEmpty())
return nullptr;
auto sharedMemory = allocate(buffer.size());
if (!sharedMemory)
return nullptr;
auto destination = sharedMemory->mutableSpan();
buffer.forEachSegment([&] (std::span<const uint8_t> segment) mutable {
memcpySpan(consumeSpan(destination, segment.size()), segment);
});
return sharedMemory;
}
Ref<SharedBuffer> SharedMemory::createSharedBuffer(size_t dataSize) const
{
ASSERT(dataSize <= size());
return SharedBuffer::create(DataSegment::Provider {
[protectedThis = Ref { *this }, dataSize]() {
return protectedThis->span().first(dataSize);
}
});
}
#if !PLATFORM(COCOA)
void SharedMemoryHandle::takeOwnershipOfMemory(MemoryLedger) const
{
}
void SharedMemoryHandle::setOwnershipOfMemory(const ProcessIdentity&, MemoryLedger) const
{
}
std::optional<SharedMemoryHandle> SharedMemoryHandle::createVMShare(std::span<const uint8_t>, SharedMemoryProtection)
{
return std::nullopt;
}
std::optional<SharedMemoryHandle> SharedMemoryHandle::createVMCopy(std::span<const uint8_t>, SharedMemoryProtection)
{
return std::nullopt;
}
#endif
std::optional<SharedMemoryHandle> SharedMemoryHandle::createCopy(std::span<const uint8_t> data, SharedMemoryProtection protection)
{
if (data.empty())
return std::nullopt;
RefPtr memory = SharedMemory::allocate(data.size());
if (!memory)
return std::nullopt;
auto handle = memory->createHandle(protection);
if (!handle)
return std::nullopt;
memcpySpan(memory->mutableSpan(), data);
return handle;
}
} // namespace WebCore
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