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/*
* Copyright (C) 2010-2024 Apple Inc. All rights reserved.
* Copyright (C) 2017 Sony Interactive Entertainment Inc.
*
* 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.
*/
#pragma once
#include <wtf/ArgumentCoder.h>
#include <wtf/Forward.h>
#include <wtf/ThreadSafeRefCounted.h>
#if USE(UNIX_DOMAIN_SOCKETS)
#include <wtf/unix/UnixFileDescriptor.h>
#endif
#if OS(WINDOWS)
#include <wtf/win/Win32Handle.h>
#endif
#if OS(DARWIN)
#include <wtf/MachSendRight.h>
#endif
#if PLATFORM(COCOA)
OBJC_CLASS NSData;
#endif
namespace WebCore {
class FragmentedSharedBuffer;
class ProcessIdentity;
class SharedBuffer;
enum class MemoryLedger { None, Default, Network, Media, Graphics, Neural };
WEBCORE_EXPORT bool isMemoryAttributionDisabled();
class SharedMemoryHandle {
public:
using Type =
#if USE(UNIX_DOMAIN_SOCKETS)
UnixFileDescriptor;
#elif OS(DARWIN)
MachSendRight;
#elif OS(WINDOWS)
Win32Handle;
#endif
SharedMemoryHandle(SharedMemoryHandle&&) = default;
#if USE(UNIX_DOMAIN_SOCKETS)
explicit SharedMemoryHandle(const SharedMemoryHandle&);
#else
explicit SharedMemoryHandle(const SharedMemoryHandle&) = default;
#endif
WEBCORE_EXPORT SharedMemoryHandle(SharedMemoryHandle::Type&&, size_t);
SharedMemoryHandle& operator=(SharedMemoryHandle&&) = default;
size_t size() const { return m_size; }
// Take ownership of the memory for process memory accounting purposes.
WEBCORE_EXPORT void takeOwnershipOfMemory(MemoryLedger) const;
// Transfer ownership of the memory for process memory accounting purposes.
WEBCORE_EXPORT void setOwnershipOfMemory(const WebCore::ProcessIdentity&, MemoryLedger) const;
#if USE(UNIX_DOMAIN_SOCKETS)
UnixFileDescriptor releaseHandle();
#endif
private:
friend struct IPC::ArgumentCoder<SharedMemoryHandle, void>;
friend class SharedMemory;
Type m_handle;
size_t m_size { 0 };
};
class SharedMemory : public ThreadSafeRefCounted<SharedMemory> {
public:
using Handle = SharedMemoryHandle;
enum class Protection : bool { ReadOnly, ReadWrite };
// FIXME: Change these factory functions to return Ref<SharedMemory> and crash on failure.
WEBCORE_EXPORT static RefPtr<SharedMemory> allocate(size_t);
WEBCORE_EXPORT static RefPtr<SharedMemory> copyBuffer(const WebCore::FragmentedSharedBuffer&);
WEBCORE_EXPORT static RefPtr<SharedMemory> copySpan(std::span<const uint8_t>);
WEBCORE_EXPORT static RefPtr<SharedMemory> map(Handle&&, Protection);
#if USE(UNIX_DOMAIN_SOCKETS)
WEBCORE_EXPORT static RefPtr<SharedMemory> wrapMap(void*, size_t, int fileDescriptor);
#elif OS(DARWIN)
WEBCORE_EXPORT static RefPtr<SharedMemory> wrapMap(std::span<const uint8_t>, Protection);
#endif
WEBCORE_EXPORT ~SharedMemory();
WEBCORE_EXPORT std::optional<Handle> createHandle(Protection);
size_t size() const { return m_size; }
std::span<const uint8_t> span() const { return unsafeMakeSpan(static_cast<const uint8_t*>(m_data), m_size); }
std::span<uint8_t> mutableSpan() const { return unsafeMakeSpan(static_cast<uint8_t*>(m_data), m_size); }
#if OS(WINDOWS)
HANDLE handle() const { return m_handle.get(); }
#endif
#if PLATFORM(COCOA)
Protection protection() const { return m_protection; }
WEBCORE_EXPORT RetainPtr<NSData> toNSData() const;
#endif
WEBCORE_EXPORT Ref<WebCore::SharedBuffer> createSharedBuffer(size_t) const;
private:
#if OS(DARWIN)
MachSendRight createSendRight(Protection) const;
#endif
size_t m_size;
void* m_data;
#if PLATFORM(COCOA)
Protection m_protection;
#endif
#if USE(UNIX_DOMAIN_SOCKETS)
UnixFileDescriptor m_fileDescriptor;
bool m_isWrappingMap { false };
#elif OS(DARWIN)
MachSendRight m_sendRight;
#elif OS(WINDOWS)
Win32Handle m_handle;
#endif
};
} // namespace WebCore
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