def free_nonmovingbuffer(data, buf):
"""
Either free a non-moving buffer or keep the original storage alive.
"""
# We cannot rely on rgc.can_move(data) here, because its result
# might have changed since get_nonmovingbuffer(). Instead we check
# if 'buf' points inside 'data'. This is only possible if we
# followed the 2nd case in get_nonmovingbuffer(); in the first case,
# 'buf' points to its own raw-malloced memory.
data = llstrtype(data)
data_start = cast_ptr_to_adr(data) + offsetof(STRTYPE, "chars") + itemoffsetof(STRTYPE.chars, 0)
followed_2nd_path = buf == cast(TYPEP, data_start)
keepalive_until_here(data)
if not followed_2nd_path:
lltype.free(buf, flavor="raw")
def free_nonmovingbuffer(data, buf):
"""
Either free a non-moving buffer or keep the original storage alive.
"""
# We cannot rely on rgc.can_move(data) here, because its result
# might have changed since get_nonmovingbuffer(). Instead we check
# if 'buf' points inside 'data'. This is only possible if we
# followed the 2nd case in get_nonmovingbuffer(); in the first case,
# 'buf' points to its own raw-malloced memory.
data = llstrtype(data)
data_start = cast_ptr_to_adr(data) + \
offsetof(STRTYPE, 'chars') + itemoffsetof(STRTYPE.chars, 0)
followed_2nd_path = (buf == cast(TYPEP, data_start))
keepalive_until_here(data)
if not followed_2nd_path:
lltype.free(buf, flavor='raw')
def get_nonmovingbuffer(data):
"""
Either returns a non-moving copy or performs neccessary pointer
arithmetic to return a pointer to the characters of a string if the
string is already nonmovable. Must be followed by a
free_nonmovingbuffer call.
"""
if rgc.can_move(data):
count = len(data)
buf = lltype.malloc(TYPEP.TO, count, flavor="raw")
for i in range(count):
buf[i] = data[i]
return buf
else:
data_start = cast_ptr_to_adr(llstrtype(data)) + offsetof(STRTYPE, "chars") + itemoffsetof(STRTYPE.chars, 0)
return cast(TYPEP, data_start)
def get_nonmovingbuffer(data):
"""
Either returns a non-moving copy or performs neccessary pointer
arithmetic to return a pointer to the characters of a string if the
string is already nonmovable. Must be followed by a
free_nonmovingbuffer call.
"""
if rgc.can_move(data):
count = len(data)
buf = lltype.malloc(TYPEP.TO, count, flavor='raw')
for i in range(count):
buf[i] = data[i]
return buf
else:
data_start = cast_ptr_to_adr(llstrtype(data)) + \
offsetof(STRTYPE, 'chars') + itemoffsetof(STRTYPE.chars, 0)
return cast(TYPEP, data_start)
