def _reveal(space, ptr):
addr = rffi.cast(llmemory.Address, ptr)
gcref = rgc.reveal_gcref(addr)
if not gcref:
raise oefmt(space.w_RuntimeError,
"cannot use from_handle() on NULL pointer")
cd = rgc.try_cast_gcref_to_instance(cdataobj.W_CDataHandle, gcref)
if cd is None:
raise oefmt(space.w_SystemError,
"ffi.from_handle(): dead or bogus object handle")
return cd.w_keepalive
def _reveal(space, ptr):
addr = rffi.cast(llmemory.Address, ptr)
gcref = rgc.reveal_gcref(addr)
if not gcref:
raise oefmt(space.w_RuntimeError,
"cannot use from_handle() on NULL pointer")
cd = rgc.try_cast_gcref_to_instance(cdataobj.W_CDataHandle, gcref)
if cd is None:
raise oefmt(space.w_SystemError,
"ffi.from_handle(): dead or bogus object handle")
return cd.w_keepalive
def invoke_callback(ffi_cif, ll_res, ll_args, ll_userdata):
""" Callback specification.
ffi_cif - something ffi specific, don't care
ll_args - rffi.VOIDPP - pointer to array of pointers to args
ll_res - rffi.VOIDP - pointer to result
ll_userdata - a special structure which holds necessary information
(what the real callback is for example), casted to VOIDP
"""
# Reveal the callback.
addr = rffi.cast(llmemory.Address, ll_userdata)
gcref = rgc.reveal_gcref(addr)
callback = rgc.try_cast_gcref_to_instance(Callback, gcref)
if callback is None:
try:
os.write(STDERR,
"Critical error: invoking a callback that was already freed\n")
except:
pass
# We cannot do anything here.
else:
#must_leave = False
try:
# must_leave = space.threadlocals.try_enter_thread(space)
# Should check for separate threads here and crash
# if the callback comes from a thread that has no execution context.
cfunc = callback.cfunc
argv = []
for i in range(0, len(cfunc.argtypes)):
argv.append( cfunc.argtypes[i].load(ll_args[i], False) )
value = callback.callback.call(argv)
if isinstance(cfunc.restype, Type):
cfunc.restype.store(None, ll_res, value)
except Unwinder as unwinder:
core.root_unwind(unwinder)
except Exception as e:
try:
os.write(STDERR, "SystemError: callback raised ")
os.write(STDERR, str(e))
os.write(STDERR, "\n")
except:
pass
def reveal_callback(raw_ptr):
addr = rffi.cast(llmemory.Address, raw_ptr)
gcref = rgc.reveal_gcref(addr)
return rgc.try_cast_gcref_to_instance(W_ExternPython, gcref)
def reveal_callback(raw_ptr):
addr = rffi.cast(llmemory.Address, raw_ptr)
gcref = rgc.reveal_gcref(addr)
return rgc.try_cast_gcref_to_instance(W_ExternPython, gcref)
def reveal_object(Class, raw_ptr):
addr = rffi.cast(llmemory.Address, raw_ptr)
gcref = rgc.reveal_gcref(addr)
return rgc.try_cast_gcref_to_instance(Class, gcref)
