def long_str(lstr):
ptr = rffi.get_raw_address_of_string(lstr)
for i, c in enumerate(lstr):
debug_assert(ptr[i] == c, "failure c")
gc.collect()
ptr2 = rffi.get_raw_address_of_string(lstr)
debug_assert(ptr == ptr2, "ptr != ptr2!!!")
return ptr
def use_str():
mystr = b'abc'
#debug_assert(rgc.can_move(mystr), "short string cannot move... why?")
ptr = rffi.get_raw_address_of_string(mystr)
ptr2 = rffi.get_raw_address_of_string(mystr)
debug_assert(ptr == ptr2, "ptr != ptr2")
debug_assert(ptr[0] == b'a', "notnurseryadr[0] == b'a' is is %s" % ptr[0])
ptr[0] = b'x' # oh no no, in real programs nobody is allowed to modify that
debug_assert(mystr[0] == b'a', "mystr[0] != b'a'")
debug_assert(ptr[0] == b'x', "notnurseryadr[0] == b'x'")
gc.collect()
nptr = rffi.get_raw_address_of_string(mystr)
debug_assert(nptr == ptr, "second call to mystr must return the same ptr")
debug_assert(ptr[0] == b'x', "failure a")
debug_assert(nptr[0] == b'x', "failure b")
mystr = None
def get_raw_address(self):
from rpython.rtyper.lltypesystem import rffi
# may still raise ValueError on some GCs
return rffi.get_raw_address_of_string(self.value)