RefPtr<SharedMemory> SharedMemory::map(const Handle& handle, Protection protection)
{
if (handle.isNull())
return 0;
ASSERT(round_page(handle.m_size) == handle.m_size);
vm_prot_t vmProtection = machProtection(protection);
mach_vm_address_t mappedAddress = 0;
kern_return_t kr = mach_vm_map(mach_task_self(), &mappedAddress, round_page(handle.m_size), 0, VM_FLAGS_ANYWHERE, handle.m_port, 0, false, vmProtection, vmProtection, VM_INHERIT_NONE);
#if RELEASE_LOG_DISABLED
if (kr != KERN_SUCCESS)
return nullptr;
#else
if (kr != KERN_SUCCESS) {
RELEASE_LOG_ERROR(VirtualMemory, "%p - SharedMemory::map: Failed to map shared memory. %{public}s (%x)", nullptr, mach_error_string(kr), kr);
return nullptr;
}
#endif
auto sharedMemory(adoptRef(*new SharedMemory));
sharedMemory->m_size = handle.m_size;
sharedMemory->m_data = toPointer(mappedAddress);
sharedMemory->m_port = MACH_PORT_NULL;
sharedMemory->m_protection = protection;
return WTFMove(sharedMemory);
}
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();
}
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;
}
RefPtr<SharedMemory> SharedMemory::map(const Handle& handle, Protection protection)
{
if (handle.isNull())
return 0;
ASSERT(round_page(handle.m_size) == handle.m_size);
vm_prot_t vmProtection = machProtection(protection);
mach_vm_address_t mappedAddress = 0;
kern_return_t kr = mach_vm_map(mach_task_self(), &mappedAddress, round_page(handle.m_size), 0, VM_FLAGS_ANYWHERE, handle.m_port, 0, false, vmProtection, vmProtection, VM_INHERIT_NONE);
if (kr != KERN_SUCCESS)
return nullptr;
auto sharedMemory(adoptRef(*new SharedMemory));
sharedMemory->m_size = handle.m_size;
sharedMemory->m_data = toPointer(mappedAddress);
sharedMemory->m_port = MACH_PORT_NULL;
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);
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;
}
static WebCore::MachSendRight makeMemoryEntry(size_t size, vm_offset_t offset, SharedMemory::Protection protection, mach_port_t parentEntry)
{
memory_object_size_t memoryObjectSize = round_page(size);
mach_port_t port;
kern_return_t kr = mach_make_memory_entry_64(mach_task_self(), &memoryObjectSize, offset, machProtection(protection) | VM_PROT_IS_MASK | MAP_MEM_VM_SHARE, &port, parentEntry);
if (kr != KERN_SUCCESS) {
LOG_ERROR("Failed to create a mach port for shared memory. %s (%x)", mach_error_string(kr), kr);
return { };
}
RELEASE_ASSERT(memoryObjectSize >= size);
return WebCore::MachSendRight::adopt(port);
}
