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
"""
cerrno._errno_after(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
ll_res = rffi.cast(rffi.CCHARP, ll_res)
callback = reveal_callback(ll_userdata)
if callback is None:
# oups!
try:
os.write(
STDERR, "SystemError: invoking a callback "
"that was already freed\n")
except:
pass
# In this case, we don't even know how big ll_res is. Let's assume
# it is just a 'ffi_arg', and store 0 there.
misc._raw_memclear(ll_res, SIZE_OF_FFI_ARG)
else:
callback.invoke(ll_res, rffi.cast(rffi.CCHARP, ll_args))
cerrno._errno_before(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
def _cffi_call_python(ll_externpy, ll_args):
"""Invoked by the helpers generated from extern "Python" in the cdef.
'externpy' is a static structure that describes which of the
extern "Python" functions is called. It has got fields 'name' and
'type_index' describing the function, and more reserved fields
that are initially zero. These reserved fields are set up by
ffi.def_extern(), which invokes externpy_deco() below.
'args' is a pointer to an array of 8-byte entries. Each entry
contains an argument. If an argument is less than 8 bytes, only
the part at the beginning of the entry is initialized. If an
argument is 'long double' or a struct/union, then it is passed
by reference.
'args' is also used as the place to write the result to
(directly, even if more than 8 bytes). In all cases, 'args' is
at least 8 bytes in size.
"""
from pypy.module._cffi_backend.ccallback import reveal_callback
from rpython.rlib import rgil
rgil.acquire()
rffi.stackcounter.stacks_counter += 1
llop.gc_stack_bottom(lltype.Void) # marker for trackgcroot.py
cerrno._errno_after(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
if not ll_externpy.c_reserved1:
# Not initialized! We don't have a space at all.
# Write the error to the file descriptor stderr.
try:
funcname = rffi.charp2str(ll_externpy.c_name)
msg = (
'extern "Python": function %s() called, but no code was '
"attached to it yet with @ffi.def_extern(). "
"Returning 0.\n" % (funcname,)
)
os.write(STDERR, msg)
except:
pass
for i in range(intmask(ll_externpy.c_size_of_result)):
ll_args[i] = "\x00"
else:
externpython = reveal_callback(ll_externpy.c_reserved1)
# the same buffer is used both for passing arguments and
# the result value
externpython.invoke(ll_args, ll_args)
cerrno._errno_before(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
rffi.stackcounter.stacks_counter -= 1
rgil.release()
def _cffi_call_python(ll_externpy, ll_args):
"""Invoked by the helpers generated from extern "Python" in the cdef.
'externpy' is a static structure that describes which of the
extern "Python" functions is called. It has got fields 'name' and
'type_index' describing the function, and more reserved fields
that are initially zero. These reserved fields are set up by
ffi.def_extern(), which invokes externpy_deco() below.
'args' is a pointer to an array of 8-byte entries. Each entry
contains an argument. If an argument is less than 8 bytes, only
the part at the beginning of the entry is initialized. If an
argument is 'long double' or a struct/union, then it is passed
by reference.
'args' is also used as the place to write the result to
(directly, even if more than 8 bytes). In all cases, 'args' is
at least 8 bytes in size.
"""
from pypy.module._cffi_backend.ccallback import reveal_callback
from rpython.rlib import rgil
rgil.acquire()
rffi.stackcounter.stacks_counter += 1
llop.gc_stack_bottom(lltype.Void) # marker for trackgcroot.py
cerrno._errno_after(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
if not ll_externpy.c_reserved1:
# Not initialized! We don't have a space at all.
# Write the error to the file descriptor stderr.
try:
funcname = rffi.charp2str(ll_externpy.c_name)
msg = ("extern \"Python\": function %s() called, but no code was "
"attached to it yet with @ffi.def_extern(). "
"Returning 0.\n" % (funcname,))
os.write(STDERR, msg)
except:
pass
for i in range(intmask(ll_externpy.c_size_of_result)):
ll_args[i] = '\x00'
else:
externpython = reveal_callback(ll_externpy.c_reserved1)
# the same buffer is used both for passing arguments and
# the result value
externpython.invoke(ll_args, ll_args)
cerrno._errno_before(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
rffi.stackcounter.stacks_counter -= 1
rgil.release()
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
"""
cerrno._errno_after(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
ll_res = rffi.cast(rffi.CCHARP, ll_res)
callback = reveal_callback(ll_userdata)
if callback is None:
# oups!
try:
os.write(STDERR, "SystemError: invoking a callback "
"that was already freed\n")
except:
pass
# In this case, we don't even know how big ll_res is. Let's assume
# it is just a 'ffi_arg', and store 0 there.
misc._raw_memclear(ll_res, SIZE_OF_FFI_ARG)
else:
callback.invoke(ll_res, rffi.cast(rffi.CCHARP, ll_args))
cerrno._errno_before(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
def invoke_callback(ffi_cif, ll_res, ll_args, ll_userdata):
cerrno._errno_after(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
_invoke_callback(ffi_cif, ll_res, ll_args, ll_userdata)
cerrno._errno_before(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
def invoke_callback(ffi_cif, ll_res, ll_args, ll_userdata):
cerrno._errno_after(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
_invoke_callback(ffi_cif, ll_res, ll_args, ll_userdata)
cerrno._errno_before(rffi.RFFI_ERR_ALL | rffi.RFFI_ALT_ERRNO)
