def generate_wrapper_core(fn: FuncIR,
emitter: Emitter,
optional_args: List[RuntimeArg] = [],
arg_names: Optional[List[str]] = None) -> None:
"""Generates the core part of a wrapper function for a native function.
This expects each argument as a PyObject * named obj_{arg} as a precondition.
It converts the PyObject *s to the necessary types, checking and unboxing if necessary,
makes the call, then boxes the result if necessary and returns it.
"""
arg_names = arg_names or [arg.name for arg in fn.args]
for arg_name, arg in zip(arg_names, fn.args):
generate_arg_check(arg_name, arg.type, emitter, arg in optional_args)
native_args = ', '.join('arg_{}'.format(arg) for arg in arg_names)
if fn.ret_type.is_unboxed:
# TODO: The Py_RETURN macros return the correct PyObject * with reference count handling.
# Are they relevant?
emitter.emit_line('{}retval = {}{}({});'.format(
emitter.ctype_spaced(fn.ret_type), NATIVE_PREFIX,
fn.cname(emitter.names), native_args))
emitter.emit_error_check('retval', fn.ret_type, 'return NULL;')
emitter.emit_box('retval', 'retbox', fn.ret_type, declare_dest=True)
emitter.emit_line('return retbox;')
else:
emitter.emit_line('return {}{}({});'.format(NATIVE_PREFIX,
fn.cname(emitter.names),
native_args))
def generate_wrapper_core(fn: FuncIR,
emitter: Emitter,
optional_args: Optional[List[RuntimeArg]] = None,
arg_names: Optional[List[str]] = None,
cleanups: Optional[List[str]] = None,
traceback_code: Optional[str] = None) -> None:
"""Generates the core part of a wrapper function for a native function.
This expects each argument as a PyObject * named obj_{arg} as a precondition.
It converts the PyObject *s to the necessary types, checking and unboxing if necessary,
makes the call, then boxes the result if necessary and returns it.
"""
optional_args = optional_args or []
cleanups = cleanups or []
use_goto = bool(cleanups or traceback_code)
error_code = 'return NULL;' if not use_goto else 'goto fail;'
arg_names = arg_names or [arg.name for arg in fn.args]
for arg_name, arg in zip(arg_names, fn.args):
# Suppress the argument check for *args/**kwargs, since we know it must be right.
typ = arg.type if arg.kind not in (ARG_STAR,
ARG_STAR2) else object_rprimitive
generate_arg_check(arg_name, typ, emitter, error_code, arg
in optional_args)
native_args = ', '.join('arg_{}'.format(arg) for arg in arg_names)
if fn.ret_type.is_unboxed or use_goto:
# TODO: The Py_RETURN macros return the correct PyObject * with reference count handling.
# Are they relevant?
emitter.emit_line('{}retval = {}{}({});'.format(
emitter.ctype_spaced(fn.ret_type), NATIVE_PREFIX,
fn.cname(emitter.names), native_args))
emitter.emit_lines(*cleanups)
if fn.ret_type.is_unboxed:
emitter.emit_error_check('retval', fn.ret_type, 'return NULL;')
emitter.emit_box('retval',
'retbox',
fn.ret_type,
declare_dest=True)
emitter.emit_line('return {};'.format(
'retbox' if fn.ret_type.is_unboxed else 'retval'))
else:
emitter.emit_line('return {}{}({});'.format(NATIVE_PREFIX,
fn.cname(emitter.names),
native_args))
# TODO: Tracebacks?
if use_goto:
emitter.emit_label('fail')
emitter.emit_lines(*cleanups)
if traceback_code:
emitter.emit_lines(traceback_code)
emitter.emit_lines('return NULL;')
def generate_readonly_getter(cl: ClassIR, attr: str, rtype: RType,
func_ir: FuncIR, emitter: Emitter) -> None:
emitter.emit_line('static PyObject *')
emitter.emit_line('{}({} *self, void *closure)'.format(
getter_name(cl, attr, emitter.names), cl.struct_name(emitter.names)))
emitter.emit_line('{')
if rtype.is_unboxed:
emitter.emit_line('{}retval = {}{}((PyObject *) self);'.format(
emitter.ctype_spaced(rtype), NATIVE_PREFIX,
func_ir.cname(emitter.names)))
emitter.emit_box('retval', 'retbox', rtype, declare_dest=True)
emitter.emit_line('return retbox;')
else:
emitter.emit_line('return {}{}((PyObject *) self);'.format(
NATIVE_PREFIX, func_ir.cname(emitter.names)))
emitter.emit_line('}')
def generate_wrapper_function(fn: FuncIR, emitter: Emitter) -> None:
"""Generates a CPython-compatible wrapper function for a native function.
In particular, this handles unboxing the arguments, calling the native function, and
then boxing the return value.
"""
emitter.emit_line('{} {{'.format(wrapper_function_header(fn, emitter.names)))
# If fn is a method, then the first argument is a self param
real_args = list(fn.args)
if fn.class_name:
arg = real_args.pop(0)
emitter.emit_line('PyObject *obj_{} = self;'.format(arg.name))
arg_names = ''.join('"{}", '.format(arg.name) for arg in real_args)
emitter.emit_line('static char *kwlist[] = {{{}0}};'.format(arg_names))
for arg in real_args:
emitter.emit_line('PyObject *obj_{};'.format(arg.name))
arg_spec = 'O' * len(real_args)
arg_ptrs = ''.join(', &obj_{}'.format(arg.name) for arg in real_args)
emitter.emit_lines(
'if (!PyArg_ParseTupleAndKeywords(args, kw, "{}:f", kwlist{})) {{'.format(
arg_spec, arg_ptrs),
'return NULL;',
'}')
for arg in fn.args:
generate_arg_check(arg.name, arg.type, emitter)
native_args = ', '.join('arg_{}'.format(arg.name) for arg in fn.args)
if fn.ret_type.is_unboxed:
# TODO: The Py_RETURN macros return the correct PyObject * with reference count handling.
# Are they relevant?
ret_type = fn.ret_type
emitter.emit_line('{}retval = {}{}({});'.format(emitter.ctype_spaced(ret_type),
NATIVE_PREFIX, fn.cname(emitter.names),
native_args))
emitter.emit_error_check('retval', ret_type, 'return NULL;')
emitter.emit_box('retval', 'retbox', ret_type, declare_dest=True)
emitter.emit_lines('return retbox;')
else:
emitter.emit_line('return {}{}({});'.format(NATIVE_PREFIX,
fn.cname(emitter.names),
native_args))
# TODO: Tracebacks?
emitter.emit_line('}')
def generate_getter(cl: ClassIR,
attr: str,
rtype: RType,
emitter: Emitter) -> None:
emitter.emit_line('static PyObject *')
emitter.emit_line('{}({} *self, void *closure)'.format(getter_name(cl, attr, emitter.names),
cl.struct_name(emitter.names)))
emitter.emit_line('{')
emitter.emit_line('if (self->{} == {}) {{'.format(attr, emitter.c_undefined_value(rtype)))
emitter.emit_line('PyErr_SetString(PyExc_AttributeError,')
emitter.emit_line(' "attribute {} of {} undefined");'.format(repr(attr),
repr(cl.name)))
emitter.emit_line('return NULL;')
emitter.emit_line('}')
emitter.emit_inc_ref('self->{}'.format(attr), rtype)
emitter.emit_box('self->{}'.format(attr), 'retval', rtype, declare_dest=True)
emitter.emit_line('return retval;')
emitter.emit_line('}')
