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/*
* Copyright (C) 2010 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 "SharedMemory.h"
#include "ArgumentDecoder.h"
#include "ArgumentEncoder.h"
#include "Arguments.h"
#include "MachPort.h"
#include <mach/mach_port.h>
#include <mach/mach_vm.h>
#include <mach/vm_map.h>
#include <wtf/RefPtr.h>
namespace WebKit {
SharedMemory::Handle::Handle()
: m_port(MACH_PORT_NULL)
, m_size(0)
{
}
SharedMemory::Handle::~Handle()
{
if (m_port)
mach_port_deallocate(mach_task_self(), m_port);
}
bool SharedMemory::Handle::isNull() const
{
return !m_port;
}
void SharedMemory::Handle::encode(CoreIPC::ArgumentEncoder* encoder) const
{
encoder->encodeUInt64(m_size);
encoder->encode(CoreIPC::MachPort(m_port, MACH_MSG_TYPE_COPY_SEND));
m_port = MACH_PORT_NULL;
}
bool SharedMemory::Handle::decode(CoreIPC::ArgumentDecoder* decoder, Handle& handle)
{
ASSERT(!handle.m_port);
ASSERT(!handle.m_size);
uint64_t size;
if (!decoder->decodeUInt64(size))
return false;
CoreIPC::MachPort machPort;
if (!decoder->decode(CoreIPC::Out(machPort)))
return false;
handle.m_size = size;
handle.m_port = machPort.port();
return true;
}
static inline void* toPointer(mach_vm_address_t address)
{
return reinterpret_cast<void*>(static_cast<uintptr_t>(address));
}
static inline mach_vm_address_t toVMAddress(void* pointer)
{
return static_cast<mach_vm_address_t>(reinterpret_cast<uintptr_t>(pointer));
}
PassRefPtr<SharedMemory> SharedMemory::create(size_t size)
{
mach_vm_address_t address;
kern_return_t kr = mach_vm_allocate(mach_task_self(), &address, round_page(size), VM_FLAGS_ANYWHERE);
if (kr != KERN_SUCCESS)
return 0;
RefPtr<SharedMemory> sharedMemory(adoptRef(new SharedMemory));
sharedMemory->m_size = size;
sharedMemory->m_data = toPointer(address);
return sharedMemory.release();
}
static inline vm_prot_t machProtection(SharedMemory::Protection protection)
{
switch (protection) {
case SharedMemory::ReadOnly:
return VM_PROT_READ;
case SharedMemory::ReadWrite:
return VM_PROT_READ | VM_PROT_WRITE;
}
ASSERT_NOT_REACHED();
return VM_PROT_NONE;
}
PassRefPtr<SharedMemory> SharedMemory::create(const Handle& handle, Protection protection)
{
if (handle.isNull())
return 0;
// Map the memory.
vm_prot_t vmProtection = machProtection(protection);
mach_vm_address_t mappedAddress = 0;
kern_return_t kr = mach_vm_map(mach_task_self(), &mappedAddress, handle.m_size, 0, VM_FLAGS_ANYWHERE, handle.m_port, 0, false, vmProtection, vmProtection, VM_INHERIT_NONE);
if (kr != KERN_SUCCESS)
return 0;
RefPtr<SharedMemory> sharedMemory(adoptRef(new SharedMemory));
sharedMemory->m_size = handle.m_size;
sharedMemory->m_data = toPointer(mappedAddress);
return sharedMemory.release();
}
SharedMemory::~SharedMemory()
{
if (!m_data)
return;
kern_return_t kr = mach_vm_deallocate(mach_task_self(), toVMAddress(m_data), round_page(m_size));
ASSERT_UNUSED(kr, kr == KERN_SUCCESS);
}
bool SharedMemory::createHandle(Handle& handle, Protection protection)
{
ASSERT(!handle.m_port);
ASSERT(!handle.m_size);
mach_vm_address_t address = toVMAddress(m_data);
memory_object_size_t size = round_page(m_size);
// Create a mach port that represents the shared memory.
mach_port_t port;
kern_return_t kr = mach_make_memory_entry_64(mach_task_self(), &size, address, machProtection(protection), &port, MACH_PORT_NULL);
if (kr != KERN_SUCCESS)
return false;
handle.m_port = port;
handle.m_size = size;
return true;
}
unsigned SharedMemory::systemPageSize()
{
return vm_page_size;
}
} // namespace WebKit
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