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);
mach_port_t port;
if (protection == ReadWrite && m_port) {
// Just re-use the port we have.
port = m_port;
if (mach_port_mod_refs(mach_task_self(), port, MACH_PORT_RIGHT_SEND, 1) != KERN_SUCCESS)
return false;
} else {
// Create a mach port that represents the shared memory.
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;
ASSERT(size >= round_page(m_size));
}
handle.m_port = port;
handle.m_size = size;
return true;
}
SharedMemory::~SharedMemory()
{
if (m_data) {
kern_return_t kr = mach_vm_deallocate(mach_task_self(), toVMAddress(m_data), round_page(m_size));
#if RELEASE_LOG_DISABLED
ASSERT_UNUSED(kr, kr == KERN_SUCCESS);
#else
if (kr != KERN_SUCCESS) {
RELEASE_LOG_ERROR(VirtualMemory, "%p - SharedMemory::~SharedMemory: Failed to deallocate shared memory. %{public}s (%x)", this, mach_error_string(kr), kr);
ASSERT_NOT_REACHED();
}
#endif
}
if (m_port) {
kern_return_t kr = mach_port_deallocate(mach_task_self(), m_port);
#if RELEASE_LOG_DISABLED
ASSERT_UNUSED(kr, kr == KERN_SUCCESS);
#else
if (kr != KERN_SUCCESS) {
RELEASE_LOG_ERROR(VirtualMemory, "%p - SharedMemory::~SharedMemory: Failed to deallocate port. %{public}s (%x)", this, mach_error_string(kr), kr);
ASSERT_NOT_REACHED();
}
#endif
}
}
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);
}
WebCore::MachSendRight SharedMemory::createSendRight(Protection protection) const
{
ASSERT(m_protection == protection || m_protection == Protection::ReadWrite && protection == Protection::ReadOnly);
ASSERT(!!m_data ^ !!m_port);
if (m_port && m_protection == protection)
return WebCore::MachSendRight::create(m_port);
ASSERT(m_data);
return makeMemoryEntry(m_size, toVMAddress(m_data), protection, MACH_PORT_NULL);
}
SharedMemory::~SharedMemory()
{
if (m_data && m_shouldVMDeallocateData) {
kern_return_t kr = mach_vm_deallocate(mach_task_self(), toVMAddress(m_data), round_page(m_size));
ASSERT_UNUSED(kr, kr == KERN_SUCCESS);
}
if (m_port) {
kern_return_t kr = mach_port_deallocate(mach_task_self(), m_port);
ASSERT_UNUSED(kr, kr == KERN_SUCCESS);
}
}
RefPtr<SharedMemory> SharedMemory::create(void* data, size_t size, Protection protection)
{
ASSERT(size);
auto sendRight = makeMemoryEntry(size, toVMAddress(data), protection, MACH_PORT_NULL);
if (!sendRight)
return nullptr;
auto sharedMemory(adoptRef(*new SharedMemory));
sharedMemory->m_size = size;
sharedMemory->m_data = nullptr;
sharedMemory->m_port = sendRight.leakSendRight();
sharedMemory->m_protection = protection;
return WTFMove(sharedMemory);
}
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;
}
PassRefPtr<SharedMemory> SharedMemory::createWithVMCopy(void* data, size_t size)
{
ASSERT(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) {
LOG_ERROR("Failed to allocate mach_vm_allocate shared memory (%zu bytes). %s (%x)", size, mach_error_string(kr), kr);
return 0;
}
if (data) {
kr = mach_vm_copy(mach_task_self(), toVMAddress(data), round_page(size), address);
if (kr != KERN_SUCCESS) {
LOG_ERROR("Failed to vm_copy in to shared memory (%zu bytes). %s (%x)", size, mach_error_string(kr), kr);
mach_vm_deallocate(mach_task_self(), address, round_page(size));
return 0;
}
}
// Create a Mach port that represents the shared memory.
mach_port_t port;
memory_object_size_t memoryObjectSize = round_page(size);
kr = mach_make_memory_entry_64(mach_task_self(), &memoryObjectSize, address, VM_PROT_DEFAULT, &port, MACH_PORT_NULL);
if (kr != KERN_SUCCESS) {
LOG_ERROR("Failed to create a mach port for shared memory. %s (%x)", mach_error_string(kr), kr);
mach_vm_deallocate(mach_task_self(), address, round_page(size));
return 0;
}
ASSERT(memoryObjectSize >= round_page(size));
RefPtr<SharedMemory> sharedMemory(adoptRef(new SharedMemory));
sharedMemory->m_size = size;
sharedMemory->m_data = toPointer(address);
sharedMemory->m_port = port;
return sharedMemory.release();
}
PassRefPtr<SharedMemory> SharedMemory::createFromVMBuffer(void* data, size_t size)
{
ASSERT(size);
// Create a Mach port that represents the shared memory.
mach_port_t port;
memory_object_size_t memoryObjectSize = round_page(size);
kern_return_t kr = mach_make_memory_entry_64(mach_task_self(), &memoryObjectSize, toVMAddress(data), VM_PROT_DEFAULT | VM_PROT_IS_MASK, &port, MACH_PORT_NULL);
if (kr != KERN_SUCCESS) {
LOG_ERROR("Failed to create a mach port for shared memory. %s (%x)", mach_error_string(kr), kr);
return 0;
}
ASSERT(memoryObjectSize >= round_page(size));
if (memoryObjectSize < round_page(size)) {
mach_port_deallocate(mach_task_self(), port);
return 0;
}
RefPtr<SharedMemory> sharedMemory(adoptRef(new SharedMemory));
sharedMemory->m_size = size;
sharedMemory->m_data = data;
sharedMemory->m_shouldVMDeallocateData = false;
sharedMemory->m_port = port;
return sharedMemory.release();
}
