/* Generator object implementation */ #include "Python.h" #include "frameobject.h" #include "structmember.h" #include "opcode.h" static PyObject *gen_close(PyGenObject *, PyObject *); static PyObject *async_gen_asend_new(PyAsyncGenObject *, PyObject *); static PyObject *async_gen_athrow_new(PyAsyncGenObject *, PyObject *); static char *NON_INIT_CORO_MSG = "can't send non-None value to a " "just-started coroutine"; static char *ASYNC_GEN_IGNORED_EXIT_MSG = "async generator ignored GeneratorExit"; static int gen_traverse(PyGenObject *gen, visitproc visit, void *arg) { Py_VISIT((PyObject *)gen->gi_frame); Py_VISIT(gen->gi_code); Py_VISIT(gen->gi_name); Py_VISIT(gen->gi_qualname); return 0; } void _PyGen_Finalize(PyObject *self) { PyGenObject *gen = (PyGenObject *)self; PyObject *res = NULL; PyObject *error_type, *error_value, *error_traceback; if (gen->gi_frame == NULL || gen->gi_frame->f_stacktop == NULL) /* Generator isn't paused, so no need to close */ return; if (PyAsyncGen_CheckExact(self)) { PyAsyncGenObject *agen = (PyAsyncGenObject*)self; PyObject *finalizer = agen->ag_finalizer; if (finalizer && !agen->ag_closed) { /* Save the current exception, if any. */ PyErr_Fetch(&error_type, &error_value, &error_traceback); res = PyObject_CallFunctionObjArgs(finalizer, self, NULL); if (res == NULL) { PyErr_WriteUnraisable(self); } else { Py_DECREF(res); } /* Restore the saved exception. */ PyErr_Restore(error_type, error_value, error_traceback); return; } } /* Save the current exception, if any. */ PyErr_Fetch(&error_type, &error_value, &error_traceback); /* If `gen` is a coroutine, and if it was never awaited on, issue a RuntimeWarning. */ if (gen->gi_code != NULL && ((PyCodeObject *)gen->gi_code)->co_flags & CO_COROUTINE && gen->gi_frame->f_lasti == -1) { if (!error_value) { PyErr_WarnFormat(PyExc_RuntimeWarning, 1, "coroutine '%.50S' was never awaited", gen->gi_qualname); } } else { res = gen_close(gen, NULL); } if (res == NULL) { if (PyErr_Occurred()) PyErr_WriteUnraisable(self); } else { Py_DECREF(res); } /* Restore the saved exception. */ PyErr_Restore(error_type, error_value, error_traceback); } static void gen_dealloc(PyGenObject *gen) { PyObject *self = (PyObject *) gen; _PyObject_GC_UNTRACK(gen); if (gen->gi_weakreflist != NULL) PyObject_ClearWeakRefs(self); _PyObject_GC_TRACK(self); if (PyObject_CallFinalizerFromDealloc(self)) return; /* resurrected. :( */ _PyObject_GC_UNTRACK(self); if (PyAsyncGen_CheckExact(gen)) { /* We have to handle this case for asynchronous generators right here, because this code has to be between UNTRACK and GC_Del. */ Py_CLEAR(((PyAsyncGenObject*)gen)->ag_finalizer); } if (gen->gi_frame != NULL) { gen->gi_frame->f_gen = NULL; Py_CLEAR(gen->gi_frame); } Py_CLEAR(gen->gi_code); Py_CLEAR(gen->gi_name); Py_CLEAR(gen->gi_qualname); PyObject_GC_Del(gen); } static PyObject * gen_send_ex(PyGenObject *gen, PyObject *arg, int exc, int closing) { PyThreadState *tstate = PyThreadState_GET(); PyFrameObject *f = gen->gi_frame; PyObject *result; if (gen->gi_running) { char *msg = "generator already executing"; if (PyCoro_CheckExact(gen)) { msg = "coroutine already executing"; } else if (PyAsyncGen_CheckExact(gen)) { msg = "async generator already executing"; } PyErr_SetString(PyExc_ValueError, msg); return NULL; } if (f == NULL || f->f_stacktop == NULL) { if (PyCoro_CheckExact(gen) && !closing) { /* `gen` is an exhausted coroutine: raise an error, except when called from gen_close(), which should always be a silent method. */ PyErr_SetString( PyExc_RuntimeError, "cannot reuse already awaited coroutine"); } else if (arg && !exc) { /* `gen` is an exhausted generator: only set exception if called from send(). */ if (PyAsyncGen_CheckExact(gen)) { PyErr_SetNone(PyExc_StopAsyncIteration); } else { PyErr_SetNone(PyExc_StopIteration); } } return NULL; } if (f->f_lasti == -1) { if (arg && arg != Py_None) { char *msg = "can't send non-None value to a " "just-started generator"; if (PyCoro_CheckExact(gen)) { msg = NON_INIT_CORO_MSG; } else if (PyAsyncGen_CheckExact(gen)) { msg = "can't send non-None value to a " "just-started async generator"; } PyErr_SetString(PyExc_TypeError, msg); return NULL; } } else { /* Push arg onto the frame's value stack */ result = arg ? arg : Py_None; Py_INCREF(result); *(f->f_stacktop++) = result; } /* Generators always return to their most recent caller, not * necessarily their creator. */ Py_XINCREF(tstate->frame); assert(f->f_back == NULL); f->f_back = tstate->frame; gen->gi_running = 1; result = PyEval_EvalFrameEx(f, exc); gen->gi_running = 0; /* Don't keep the reference to f_back any longer than necessary. It * may keep a chain of frames alive or it could create a reference * cycle. */ assert(f->f_back == tstate->frame); Py_CLEAR(f->f_back); /* If the generator just returned (as opposed to yielding), signal * that the generator is exhausted. */ if (result && f->f_stacktop == NULL) { if (result == Py_None) { /* Delay exception instantiation if we can */ if (PyAsyncGen_CheckExact(gen)) { PyErr_SetNone(PyExc_StopAsyncIteration); } else { PyErr_SetNone(PyExc_StopIteration); } } else { /* Async generators cannot return anything but None */ assert(!PyAsyncGen_CheckExact(gen)); _PyGen_SetStopIterationValue(result); } Py_CLEAR(result); } else if (!result && PyErr_ExceptionMatches(PyExc_StopIteration)) { /* Check for __future__ generator_stop and conditionally turn * a leaking StopIteration into RuntimeError (with its cause * set appropriately). */ const int check_stop_iter_error_flags = CO_FUTURE_GENERATOR_STOP | CO_COROUTINE | CO_ITERABLE_COROUTINE | CO_ASYNC_GENERATOR; if (gen->gi_code != NULL && ((PyCodeObject *)gen->gi_code)->co_flags & check_stop_iter_error_flags) { /* `gen` is either: * a generator with CO_FUTURE_GENERATOR_STOP flag; * a coroutine; * a generator with CO_ITERABLE_COROUTINE flag (decorated with types.coroutine decorator); * an async generator. */ const char *msg = "generator raised StopIteration"; if (PyCoro_CheckExact(gen)) { msg = "coroutine raised StopIteration"; } else if PyAsyncGen_CheckExact(gen) { msg = "async generator raised StopIteration"; } _PyErr_FormatFromCause(PyExc_RuntimeError, "%s", msg); } else { /* `gen` is an ordinary generator without CO_FUTURE_GENERATOR_STOP flag. */ PyObject *exc, *val, *tb; /* Pop the exception before issuing a warning. */ PyErr_Fetch(&exc, &val, &tb); if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1, "generator '%.50S' raised StopIteration", gen->gi_qualname)) { /* Warning was converted to an error. */ Py_XDECREF(exc); Py_XDECREF(val); Py_XDECREF(tb); } else { PyErr_Restore(exc, val, tb); } } } else if (PyAsyncGen_CheckExact(gen) && !result && PyErr_ExceptionMatches(PyExc_StopAsyncIteration)) { /* code in `gen` raised a StopAsyncIteration error: raise a RuntimeError. */ const char *msg = "async generator raised StopAsyncIteration"; _PyErr_FormatFromCause(PyExc_RuntimeError, "%s", msg); } if (!result || f->f_stacktop == NULL) { /* generator can't be rerun, so release the frame */ /* first clean reference cycle through stored exception traceback */ PyObject *t, *v, *tb; t = f->f_exc_type; v = f->f_exc_value; tb = f->f_exc_traceback; f->f_exc_type = NULL; f->f_exc_value = NULL; f->f_exc_traceback = NULL; Py_XDECREF(t); Py_XDECREF(v); Py_XDECREF(tb); gen->gi_frame->f_gen = NULL; gen->gi_frame = NULL; Py_DECREF(f); } return result; } PyDoc_STRVAR(send_doc, "send(arg) -> send 'arg' into generator,\n\ return next yielded value or raise StopIteration."); PyObject * _PyGen_Send(PyGenObject *gen, PyObject *arg) { return gen_send_ex(gen, arg, 0, 0); } PyDoc_STRVAR(close_doc, "close() -> raise GeneratorExit inside generator."); /* * This helper function is used by gen_close and gen_throw to * close a subiterator being delegated to by yield-from. */ static int gen_close_iter(PyObject *yf) { PyObject *retval = NULL; _Py_IDENTIFIER(close); if (PyGen_CheckExact(yf) || PyCoro_CheckExact(yf)) { retval = gen_close((PyGenObject *)yf, NULL); if (retval == NULL) return -1; } else { PyObject *meth = _PyObject_GetAttrId(yf, &PyId_close); if (meth == NULL) { if (!PyErr_ExceptionMatches(PyExc_AttributeError)) PyErr_WriteUnraisable(yf); PyErr_Clear(); } else { retval = _PyObject_CallNoArg(meth); Py_DECREF(meth); if (retval == NULL) return -1; } } Py_XDECREF(retval); return 0; } PyObject * _PyGen_yf(PyGenObject *gen) { PyObject *yf = NULL; PyFrameObject *f = gen->gi_frame; if (f && f->f_stacktop) { PyObject *bytecode = f->f_code->co_code; unsigned char *code = (unsigned char *)PyBytes_AS_STRING(bytecode); if (code[f->f_lasti + sizeof(_Py_CODEUNIT)] != YIELD_FROM) return NULL; yf = f->f_stacktop[-1]; Py_INCREF(yf); } return yf; } static PyObject * gen_close(PyGenObject *gen, PyObject *args) { PyObject *retval; PyObject *yf = _PyGen_yf(gen); int err = 0; if (yf) { gen->gi_running = 1; err = gen_close_iter(yf); gen->gi_running = 0; Py_DECREF(yf); } if (err == 0) PyErr_SetNone(PyExc_GeneratorExit); retval = gen_send_ex(gen, Py_None, 1, 1); if (retval) { char *msg = "generator ignored GeneratorExit"; if (PyCoro_CheckExact(gen)) { msg = "coroutine ignored GeneratorExit"; } else if (PyAsyncGen_CheckExact(gen)) { msg = ASYNC_GEN_IGNORED_EXIT_MSG; } Py_DECREF(retval); PyErr_SetString(PyExc_RuntimeError, msg); return NULL; } if (PyErr_ExceptionMatches(PyExc_StopIteration) || PyErr_ExceptionMatches(PyExc_GeneratorExit)) { PyErr_Clear(); /* ignore these errors */ Py_INCREF(Py_None); return Py_None; } return NULL; } PyDoc_STRVAR(throw_doc, "throw(typ[,val[,tb]]) -> raise exception in generator,\n\ return next yielded value or raise StopIteration."); static PyObject * _gen_throw(PyGenObject *gen, int close_on_genexit, PyObject *typ, PyObject *val, PyObject *tb) { PyObject *yf = _PyGen_yf(gen); _Py_IDENTIFIER(throw); if (yf) { PyObject *ret; int err; if (PyErr_GivenExceptionMatches(typ, PyExc_GeneratorExit) && close_on_genexit ) { /* Asynchronous generators *should not* be closed right away. We have to allow some awaits to work it through, hence the `close_on_genexit` parameter here. */ gen->gi_running = 1; err = gen_close_iter(yf); gen->gi_running = 0; Py_DECREF(yf); if (err < 0) return gen_send_ex(gen, Py_None, 1, 0); goto throw_here; } if (PyGen_CheckExact(yf) || PyCoro_CheckExact(yf)) { /* `yf` is a generator or a coroutine. */ gen->gi_running = 1; /* Close the generator that we are currently iterating with 'yield from' or awaiting on with 'await'. */ ret = _gen_throw((PyGenObject *)yf, close_on_genexit, typ, val, tb); gen->gi_running = 0; } else { /* `yf` is an iterator or a coroutine-like object. */ PyObject *meth = _PyObject_GetAttrId(yf, &PyId_throw); if (meth == NULL) { if (!PyErr_ExceptionMatches(PyExc_AttributeError)) { Py_DECREF(yf); return NULL; } PyErr_Clear(); Py_DECREF(yf); goto throw_here; } gen->gi_running = 1; ret = PyObject_CallFunctionObjArgs(meth, typ, val, tb, NULL); gen->gi_running = 0; Py_DECREF(meth); } Py_DECREF(yf); if (!ret) { PyObject *val; /* Pop subiterator from stack */ ret = *(--gen->gi_frame->f_stacktop); assert(ret == yf); Py_DECREF(ret); /* Termination repetition of YIELD_FROM */ gen->gi_frame->f_lasti += sizeof(_Py_CODEUNIT); if (_PyGen_FetchStopIterationValue(&val) == 0) { ret = gen_send_ex(gen, val, 0, 0); Py_DECREF(val); } else { ret = gen_send_ex(gen, Py_None, 1, 0); } } return ret; } throw_here: /* First, check the traceback argument, replacing None with NULL. */ if (tb == Py_None) { tb = NULL; } else if (tb != NULL && !PyTraceBack_Check(tb)) { PyErr_SetString(PyExc_TypeError, "throw() third argument must be a traceback object"); return NULL; } Py_INCREF(typ); Py_XINCREF(val); Py_XINCREF(tb); if (PyExceptionClass_Check(typ)) PyErr_NormalizeException(&typ, &val, &tb); else if (PyExceptionInstance_Check(typ)) { /* Raising an instance. The value should be a dummy. */ if (val && val != Py_None) { PyErr_SetString(PyExc_TypeError, "instance exception may not have a separate value"); goto failed_throw; } else { /* Normalize to raise , */ Py_XDECREF(val); val = typ; typ = PyExceptionInstance_Class(typ); Py_INCREF(typ); if (tb == NULL) /* Returns NULL if there's no traceback */ tb = PyException_GetTraceback(val); } } else { /* Not something you can raise. throw() fails. */ PyErr_Format(PyExc_TypeError, "exceptions must be classes or instances " "deriving from BaseException, not %s", Py_TYPE(typ)->tp_name); goto failed_throw; } PyErr_Restore(typ, val, tb); return gen_send_ex(gen, Py_None, 1, 0); failed_throw: /* Didn't use our arguments, so restore their original refcounts */ Py_DECREF(typ); Py_XDECREF(val); Py_XDECREF(tb); return NULL; } static PyObject * gen_throw(PyGenObject *gen, PyObject *args) { PyObject *typ; PyObject *tb = NULL; PyObject *val = NULL; if (!PyArg_UnpackTuple(args, "throw", 1, 3, &typ, &val, &tb)) { return NULL; } return _gen_throw(gen, 1, typ, val, tb); } static PyObject * gen_iternext(PyGenObject *gen) { return gen_send_ex(gen, NULL, 0, 0); } /* * Set StopIteration with specified value. Value can be arbitrary object * or NULL. * * Returns 0 if StopIteration is set and -1 if any other exception is set. */ int _PyGen_SetStopIterationValue(PyObject *value) { PyObject *e; if (value == NULL || (!PyTuple_Check(value) && !PyObject_TypeCheck(value, (PyTypeObject *) PyExc_StopIteration))) { /* Delay exception instantiation if we can */ PyErr_SetObject(PyExc_StopIteration, value); return 0; } /* Construct an exception instance manually with * PyObject_CallFunctionObjArgs and pass it to PyErr_SetObject. * * We do this to handle a situation when "value" is a tuple, in which * case PyErr_SetObject would set the value of StopIteration to * the first element of the tuple. * * (See PyErr_SetObject/_PyErr_CreateException code for details.) */ e = PyObject_CallFunctionObjArgs(PyExc_StopIteration, value, NULL); if (e == NULL) { return -1; } PyErr_SetObject(PyExc_StopIteration, e); Py_DECREF(e); return 0; } /* * If StopIteration exception is set, fetches its 'value' * attribute if any, otherwise sets pvalue to None. * * Returns 0 if no exception or StopIteration is set. * If any other exception is set, returns -1 and leaves * pvalue unchanged. */ int _PyGen_FetchStopIterationValue(PyObject **pvalue) { PyObject *et, *ev, *tb; PyObject *value = NULL; if (PyErr_ExceptionMatches(PyExc_StopIteration)) { PyErr_Fetch(&et, &ev, &tb); if (ev) { /* exception will usually be normalised already */ if (PyObject_TypeCheck(ev, (PyTypeObject *) et)) { value = ((PyStopIterationObject *)ev)->value; Py_INCREF(value); Py_DECREF(ev); } else if (et == PyExc_StopIteration && !PyTuple_Check(ev)) { /* Avoid normalisation and take ev as value. * * Normalization is required if the value is a tuple, in * that case the value of StopIteration would be set to * the first element of the tuple. * * (See _PyErr_CreateException code for details.) */ value = ev; } else { /* normalisation required */ PyErr_NormalizeException(&et, &ev, &tb); if (!PyObject_TypeCheck(ev, (PyTypeObject *)PyExc_StopIteration)) { PyErr_Restore(et, ev, tb); return -1; } value = ((PyStopIterationObject *)ev)->value; Py_INCREF(value); Py_DECREF(ev); } } Py_XDECREF(et); Py_XDECREF(tb); } else if (PyErr_Occurred()) { return -1; } if (value == NULL) { value = Py_None; Py_INCREF(value); } *pvalue = value; return 0; } static PyObject * gen_repr(PyGenObject *gen) { return PyUnicode_FromFormat("", gen->gi_qualname, gen); } static PyObject * gen_get_name(PyGenObject *op) { Py_INCREF(op->gi_name); return op->gi_name; } static int gen_set_name(PyGenObject *op, PyObject *value) { /* Not legal to del gen.gi_name or to set it to anything * other than a string object. */ if (value == NULL || !PyUnicode_Check(value)) { PyErr_SetString(PyExc_TypeError, "__name__ must be set to a string object"); return -1; } Py_INCREF(value); Py_XSETREF(op->gi_name, value); return 0; } static PyObject * gen_get_qualname(PyGenObject *op) { Py_INCREF(op->gi_qualname); return op->gi_qualname; } static int gen_set_qualname(PyGenObject *op, PyObject *value) { /* Not legal to del gen.__qualname__ or to set it to anything * other than a string object. */ if (value == NULL || !PyUnicode_Check(value)) { PyErr_SetString(PyExc_TypeError, "__qualname__ must be set to a string object"); return -1; } Py_INCREF(value); Py_XSETREF(op->gi_qualname, value); return 0; } static PyObject * gen_getyieldfrom(PyGenObject *gen) { PyObject *yf = _PyGen_yf(gen); if (yf == NULL) Py_RETURN_NONE; return yf; } static PyGetSetDef gen_getsetlist[] = { {"__name__", (getter)gen_get_name, (setter)gen_set_name, PyDoc_STR("name of the generator")}, {"__qualname__", (getter)gen_get_qualname, (setter)gen_set_qualname, PyDoc_STR("qualified name of the generator")}, {"gi_yieldfrom", (getter)gen_getyieldfrom, NULL, PyDoc_STR("object being iterated by yield from, or None")}, {NULL} /* Sentinel */ }; static PyMemberDef gen_memberlist[] = { {"gi_frame", T_OBJECT, offsetof(PyGenObject, gi_frame), READONLY}, {"gi_running", T_BOOL, offsetof(PyGenObject, gi_running), READONLY}, {"gi_code", T_OBJECT, offsetof(PyGenObject, gi_code), READONLY}, {NULL} /* Sentinel */ }; static PyMethodDef gen_methods[] = { {"send",(PyCFunction)_PyGen_Send, METH_O, send_doc}, {"throw",(PyCFunction)gen_throw, METH_VARARGS, throw_doc}, {"close",(PyCFunction)gen_close, METH_NOARGS, close_doc}, {NULL, NULL} /* Sentinel */ }; PyTypeObject PyGen_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "generator", /* tp_name */ sizeof(PyGenObject), /* tp_basicsize */ 0, /* tp_itemsize */ /* methods */ (destructor)gen_dealloc, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ (reprfunc)gen_repr, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /* tp_flags */ 0, /* tp_doc */ (traverseproc)gen_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ offsetof(PyGenObject, gi_weakreflist), /* tp_weaklistoffset */ PyObject_SelfIter, /* tp_iter */ (iternextfunc)gen_iternext, /* tp_iternext */ gen_methods, /* tp_methods */ gen_memberlist, /* tp_members */ gen_getsetlist, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ 0, /* tp_descr_get */ 0, /* tp_descr_set */ 0, /* tp_dictoffset */ 0, /* tp_init */ 0, /* tp_alloc */ 0, /* tp_new */ 0, /* tp_free */ 0, /* tp_is_gc */ 0, /* tp_bases */ 0, /* tp_mro */ 0, /* tp_cache */ 0, /* tp_subclasses */ 0, /* tp_weaklist */ 0, /* tp_del */ 0, /* tp_version_tag */ _PyGen_Finalize, /* tp_finalize */ }; static PyObject * gen_new_with_qualname(PyTypeObject *type, PyFrameObject *f, PyObject *name, PyObject *qualname) { PyGenObject *gen = PyObject_GC_New(PyGenObject, type); if (gen == NULL) { Py_DECREF(f); return NULL; } gen->gi_frame = f; f->f_gen = (PyObject *) gen; Py_INCREF(f->f_code); gen->gi_code = (PyObject *)(f->f_code); gen->gi_running = 0; gen->gi_weakreflist = NULL; if (name != NULL) gen->gi_name = name; else gen->gi_name = ((PyCodeObject *)gen->gi_code)->co_name; Py_INCREF(gen->gi_name); if (qualname != NULL) gen->gi_qualname = qualname; else gen->gi_qualname = gen->gi_name; Py_INCREF(gen->gi_qualname); _PyObject_GC_TRACK(gen); return (PyObject *)gen; } PyObject * PyGen_NewWithQualName(PyFrameObject *f, PyObject *name, PyObject *qualname) { return gen_new_with_qualname(&PyGen_Type, f, name, qualname); } PyObject * PyGen_New(PyFrameObject *f) { return gen_new_with_qualname(&PyGen_Type, f, NULL, NULL); } int PyGen_NeedsFinalizing(PyGenObject *gen) { int i; PyFrameObject *f = gen->gi_frame; if (f == NULL || f->f_stacktop == NULL) return 0; /* no frame or empty blockstack == no finalization */ /* Any block type besides a loop requires cleanup. */ for (i = 0; i < f->f_iblock; i++) if (f->f_blockstack[i].b_type != SETUP_LOOP) return 1; /* No blocks except loops, it's safe to skip finalization. */ return 0; } /* Coroutine Object */ typedef struct { PyObject_HEAD PyCoroObject *cw_coroutine; } PyCoroWrapper; static int gen_is_coroutine(PyObject *o) { if (PyGen_CheckExact(o)) { PyCodeObject *code = (PyCodeObject *)((PyGenObject*)o)->gi_code; if (code->co_flags & CO_ITERABLE_COROUTINE) { return 1; } } return 0; } /* * This helper function returns an awaitable for `o`: * - `o` if `o` is a coroutine-object; * - `type(o)->tp_as_async->am_await(o)` * * Raises a TypeError if it's not possible to return * an awaitable and returns NULL. */ PyObject * _PyCoro_GetAwaitableIter(PyObject *o) { unaryfunc getter = NULL; PyTypeObject *ot; if (PyCoro_CheckExact(o) || gen_is_coroutine(o)) { /* 'o' is a coroutine. */ Py_INCREF(o); return o; } ot = Py_TYPE(o); if (ot->tp_as_async != NULL) { getter = ot->tp_as_async->am_await; } if (getter != NULL) { PyObject *res = (*getter)(o); if (res != NULL) { if (PyCoro_CheckExact(res) || gen_is_coroutine(res)) { /* __await__ must return an *iterator*, not a coroutine or another awaitable (see PEP 492) */ PyErr_SetString(PyExc_TypeError, "__await__() returned a coroutine"); Py_CLEAR(res); } else if (!PyIter_Check(res)) { PyErr_Format(PyExc_TypeError, "__await__() returned non-iterator " "of type '%.100s'", Py_TYPE(res)->tp_name); Py_CLEAR(res); } } return res; } PyErr_Format(PyExc_TypeError, "object %.100s can't be used in 'await' expression", ot->tp_name); return NULL; } static PyObject * coro_repr(PyCoroObject *coro) { return PyUnicode_FromFormat("", coro->cr_qualname, coro); } static PyObject * coro_await(PyCoroObject *coro) { PyCoroWrapper *cw = PyObject_GC_New(PyCoroWrapper, &_PyCoroWrapper_Type); if (cw == NULL) { return NULL; } Py_INCREF(coro); cw->cw_coroutine = coro; _PyObject_GC_TRACK(cw); return (PyObject *)cw; } static PyObject * coro_get_cr_await(PyCoroObject *coro) { PyObject *yf = _PyGen_yf((PyGenObject *) coro); if (yf == NULL) Py_RETURN_NONE; return yf; } static PyGetSetDef coro_getsetlist[] = { {"__name__", (getter)gen_get_name, (setter)gen_set_name, PyDoc_STR("name of the coroutine")}, {"__qualname__", (getter)gen_get_qualname, (setter)gen_set_qualname, PyDoc_STR("qualified name of the coroutine")}, {"cr_await", (getter)coro_get_cr_await, NULL, PyDoc_STR("object being awaited on, or None")}, {NULL} /* Sentinel */ }; static PyMemberDef coro_memberlist[] = { {"cr_frame", T_OBJECT, offsetof(PyCoroObject, cr_frame), READONLY}, {"cr_running", T_BOOL, offsetof(PyCoroObject, cr_running), READONLY}, {"cr_code", T_OBJECT, offsetof(PyCoroObject, cr_code), READONLY}, {NULL} /* Sentinel */ }; PyDoc_STRVAR(coro_send_doc, "send(arg) -> send 'arg' into coroutine,\n\ return next iterated value or raise StopIteration."); PyDoc_STRVAR(coro_throw_doc, "throw(typ[,val[,tb]]) -> raise exception in coroutine,\n\ return next iterated value or raise StopIteration."); PyDoc_STRVAR(coro_close_doc, "close() -> raise GeneratorExit inside coroutine."); static PyMethodDef coro_methods[] = { {"send",(PyCFunction)_PyGen_Send, METH_O, coro_send_doc}, {"throw",(PyCFunction)gen_throw, METH_VARARGS, coro_throw_doc}, {"close",(PyCFunction)gen_close, METH_NOARGS, coro_close_doc}, {NULL, NULL} /* Sentinel */ }; static PyAsyncMethods coro_as_async = { (unaryfunc)coro_await, /* am_await */ 0, /* am_aiter */ 0 /* am_anext */ }; PyTypeObject PyCoro_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "coroutine", /* tp_name */ sizeof(PyCoroObject), /* tp_basicsize */ 0, /* tp_itemsize */ /* methods */ (destructor)gen_dealloc, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ &coro_as_async, /* tp_as_async */ (reprfunc)coro_repr, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /* tp_flags */ 0, /* tp_doc */ (traverseproc)gen_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ offsetof(PyCoroObject, cr_weakreflist), /* tp_weaklistoffset */ 0, /* tp_iter */ 0, /* tp_iternext */ coro_methods, /* tp_methods */ coro_memberlist, /* tp_members */ coro_getsetlist, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ 0, /* tp_descr_get */ 0, /* tp_descr_set */ 0, /* tp_dictoffset */ 0, /* tp_init */ 0, /* tp_alloc */ 0, /* tp_new */ 0, /* tp_free */ 0, /* tp_is_gc */ 0, /* tp_bases */ 0, /* tp_mro */ 0, /* tp_cache */ 0, /* tp_subclasses */ 0, /* tp_weaklist */ 0, /* tp_del */ 0, /* tp_version_tag */ _PyGen_Finalize, /* tp_finalize */ }; static void coro_wrapper_dealloc(PyCoroWrapper *cw) { _PyObject_GC_UNTRACK((PyObject *)cw); Py_CLEAR(cw->cw_coroutine); PyObject_GC_Del(cw); } static PyObject * coro_wrapper_iternext(PyCoroWrapper *cw) { return gen_send_ex((PyGenObject *)cw->cw_coroutine, NULL, 0, 0); } static PyObject * coro_wrapper_send(PyCoroWrapper *cw, PyObject *arg) { return gen_send_ex((PyGenObject *)cw->cw_coroutine, arg, 0, 0); } static PyObject * coro_wrapper_throw(PyCoroWrapper *cw, PyObject *args) { return gen_throw((PyGenObject *)cw->cw_coroutine, args); } static PyObject * coro_wrapper_close(PyCoroWrapper *cw, PyObject *args) { return gen_close((PyGenObject *)cw->cw_coroutine, args); } static int coro_wrapper_traverse(PyCoroWrapper *cw, visitproc visit, void *arg) { Py_VISIT((PyObject *)cw->cw_coroutine); return 0; } static PyMethodDef coro_wrapper_methods[] = { {"send",(PyCFunction)coro_wrapper_send, METH_O, coro_send_doc}, {"throw",(PyCFunction)coro_wrapper_throw, METH_VARARGS, coro_throw_doc}, {"close",(PyCFunction)coro_wrapper_close, METH_NOARGS, coro_close_doc}, {NULL, NULL} /* Sentinel */ }; PyTypeObject _PyCoroWrapper_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "coroutine_wrapper", sizeof(PyCoroWrapper), /* tp_basicsize */ 0, /* tp_itemsize */ (destructor)coro_wrapper_dealloc, /* destructor tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ 0, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ "A wrapper object implementing __await__ for coroutines.", (traverseproc)coro_wrapper_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ 0, /* tp_weaklistoffset */ PyObject_SelfIter, /* tp_iter */ (iternextfunc)coro_wrapper_iternext, /* tp_iternext */ coro_wrapper_methods, /* tp_methods */ 0, /* tp_members */ 0, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ 0, /* tp_descr_get */ 0, /* tp_descr_set */ 0, /* tp_dictoffset */ 0, /* tp_init */ 0, /* tp_alloc */ 0, /* tp_new */ 0, /* tp_free */ }; PyObject * PyCoro_New(PyFrameObject *f, PyObject *name, PyObject *qualname) { return gen_new_with_qualname(&PyCoro_Type, f, name, qualname); } /* __aiter__ wrapper; see http://bugs.python.org/issue27243 for details. */ typedef struct { PyObject_HEAD PyObject *ags_aiter; } PyAIterWrapper; static PyObject * aiter_wrapper_iternext(PyAIterWrapper *aw) { _PyGen_SetStopIterationValue(aw->ags_aiter); return NULL; } static int aiter_wrapper_traverse(PyAIterWrapper *aw, visitproc visit, void *arg) { Py_VISIT((PyObject *)aw->ags_aiter); return 0; } static void aiter_wrapper_dealloc(PyAIterWrapper *aw) { _PyObject_GC_UNTRACK((PyObject *)aw); Py_CLEAR(aw->ags_aiter); PyObject_GC_Del(aw); } static PyAsyncMethods aiter_wrapper_as_async = { PyObject_SelfIter, /* am_await */ 0, /* am_aiter */ 0 /* am_anext */ }; PyTypeObject _PyAIterWrapper_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "aiter_wrapper", sizeof(PyAIterWrapper), /* tp_basicsize */ 0, /* tp_itemsize */ (destructor)aiter_wrapper_dealloc, /* destructor tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ &aiter_wrapper_as_async, /* tp_as_async */ 0, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ "A wrapper object for __aiter__ bakwards compatibility.", (traverseproc)aiter_wrapper_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ 0, /* tp_weaklistoffset */ PyObject_SelfIter, /* tp_iter */ (iternextfunc)aiter_wrapper_iternext, /* tp_iternext */ 0, /* tp_methods */ 0, /* tp_members */ 0, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ 0, /* tp_descr_get */ 0, /* tp_descr_set */ 0, /* tp_dictoffset */ 0, /* tp_init */ 0, /* tp_alloc */ 0, /* tp_new */ 0, /* tp_free */ }; PyObject * _PyAIterWrapper_New(PyObject *aiter) { PyAIterWrapper *aw = PyObject_GC_New(PyAIterWrapper, &_PyAIterWrapper_Type); if (aw == NULL) { return NULL; } Py_INCREF(aiter); aw->ags_aiter = aiter; _PyObject_GC_TRACK(aw); return (PyObject *)aw; } /* ========= Asynchronous Generators ========= */ typedef enum { AWAITABLE_STATE_INIT, /* new awaitable, has not yet been iterated */ AWAITABLE_STATE_ITER, /* being iterated */ AWAITABLE_STATE_CLOSED, /* closed */ } AwaitableState; typedef struct { PyObject_HEAD PyAsyncGenObject *ags_gen; /* Can be NULL, when in the __anext__() mode (equivalent of "asend(None)") */ PyObject *ags_sendval; AwaitableState ags_state; } PyAsyncGenASend; typedef struct { PyObject_HEAD PyAsyncGenObject *agt_gen; /* Can be NULL, when in the "aclose()" mode (equivalent of "athrow(GeneratorExit)") */ PyObject *agt_args; AwaitableState agt_state; } PyAsyncGenAThrow; typedef struct { PyObject_HEAD PyObject *agw_val; } _PyAsyncGenWrappedValue; #ifndef _PyAsyncGen_MAXFREELIST #define _PyAsyncGen_MAXFREELIST 80 #endif /* Freelists boost performance 6-10%; they also reduce memory fragmentation, as _PyAsyncGenWrappedValue and PyAsyncGenASend are short-living objects that are instantiated for every __anext__ call. */ static _PyAsyncGenWrappedValue *ag_value_freelist[_PyAsyncGen_MAXFREELIST]; static int ag_value_freelist_free = 0; static PyAsyncGenASend *ag_asend_freelist[_PyAsyncGen_MAXFREELIST]; static int ag_asend_freelist_free = 0; #define _PyAsyncGenWrappedValue_CheckExact(o) \ (Py_TYPE(o) == &_PyAsyncGenWrappedValue_Type) #define PyAsyncGenASend_CheckExact(o) \ (Py_TYPE(o) == &_PyAsyncGenASend_Type) static int async_gen_traverse(PyAsyncGenObject *gen, visitproc visit, void *arg) { Py_VISIT(gen->ag_finalizer); return gen_traverse((PyGenObject*)gen, visit, arg); } static PyObject * async_gen_repr(PyAsyncGenObject *o) { return PyUnicode_FromFormat("", o->ag_qualname, o); } static int async_gen_init_hooks(PyAsyncGenObject *o) { PyThreadState *tstate; PyObject *finalizer; PyObject *firstiter; if (o->ag_hooks_inited) { return 0; } o->ag_hooks_inited = 1; tstate = PyThreadState_GET(); finalizer = tstate->async_gen_finalizer; if (finalizer) { Py_INCREF(finalizer); o->ag_finalizer = finalizer; } firstiter = tstate->async_gen_firstiter; if (firstiter) { PyObject *res; Py_INCREF(firstiter); res = PyObject_CallFunction(firstiter, "O", o); Py_DECREF(firstiter); if (res == NULL) { return 1; } Py_DECREF(res); } return 0; } static PyObject * async_gen_anext(PyAsyncGenObject *o) { if (async_gen_init_hooks(o)) { return NULL; } return async_gen_asend_new(o, NULL); } static PyObject * async_gen_asend(PyAsyncGenObject *o, PyObject *arg) { if (async_gen_init_hooks(o)) { return NULL; } return async_gen_asend_new(o, arg); } static PyObject * async_gen_aclose(PyAsyncGenObject *o, PyObject *arg) { if (async_gen_init_hooks(o)) { return NULL; } return async_gen_athrow_new(o, NULL); } static PyObject * async_gen_athrow(PyAsyncGenObject *o, PyObject *args) { if (async_gen_init_hooks(o)) { return NULL; } return async_gen_athrow_new(o, args); } static PyGetSetDef async_gen_getsetlist[] = { {"__name__", (getter)gen_get_name, (setter)gen_set_name, PyDoc_STR("name of the async generator")}, {"__qualname__", (getter)gen_get_qualname, (setter)gen_set_qualname, PyDoc_STR("qualified name of the async generator")}, {"ag_await", (getter)coro_get_cr_await, NULL, PyDoc_STR("object being awaited on, or None")}, {NULL} /* Sentinel */ }; static PyMemberDef async_gen_memberlist[] = { {"ag_frame", T_OBJECT, offsetof(PyAsyncGenObject, ag_frame), READONLY}, {"ag_running", T_BOOL, offsetof(PyAsyncGenObject, ag_running), READONLY}, {"ag_code", T_OBJECT, offsetof(PyAsyncGenObject, ag_code), READONLY}, {NULL} /* Sentinel */ }; PyDoc_STRVAR(async_aclose_doc, "aclose() -> raise GeneratorExit inside generator."); PyDoc_STRVAR(async_asend_doc, "asend(v) -> send 'v' in generator."); PyDoc_STRVAR(async_athrow_doc, "athrow(typ[,val[,tb]]) -> raise exception in generator."); static PyMethodDef async_gen_methods[] = { {"asend", (PyCFunction)async_gen_asend, METH_O, async_asend_doc}, {"athrow",(PyCFunction)async_gen_athrow, METH_VARARGS, async_athrow_doc}, {"aclose", (PyCFunction)async_gen_aclose, METH_NOARGS, async_aclose_doc}, {NULL, NULL} /* Sentinel */ }; static PyAsyncMethods async_gen_as_async = { 0, /* am_await */ PyObject_SelfIter, /* am_aiter */ (unaryfunc)async_gen_anext /* am_anext */ }; PyTypeObject PyAsyncGen_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "async_generator", /* tp_name */ sizeof(PyAsyncGenObject), /* tp_basicsize */ 0, /* tp_itemsize */ /* methods */ (destructor)gen_dealloc, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ &async_gen_as_async, /* tp_as_async */ (reprfunc)async_gen_repr, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /* tp_flags */ 0, /* tp_doc */ (traverseproc)async_gen_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ offsetof(PyAsyncGenObject, ag_weakreflist), /* tp_weaklistoffset */ 0, /* tp_iter */ 0, /* tp_iternext */ async_gen_methods, /* tp_methods */ async_gen_memberlist, /* tp_members */ async_gen_getsetlist, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ 0, /* tp_descr_get */ 0, /* tp_descr_set */ 0, /* tp_dictoffset */ 0, /* tp_init */ 0, /* tp_alloc */ 0, /* tp_new */ 0, /* tp_free */ 0, /* tp_is_gc */ 0, /* tp_bases */ 0, /* tp_mro */ 0, /* tp_cache */ 0, /* tp_subclasses */ 0, /* tp_weaklist */ 0, /* tp_del */ 0, /* tp_version_tag */ _PyGen_Finalize, /* tp_finalize */ }; PyObject * PyAsyncGen_New(PyFrameObject *f, PyObject *name, PyObject *qualname) { PyAsyncGenObject *o; o = (PyAsyncGenObject *)gen_new_with_qualname( &PyAsyncGen_Type, f, name, qualname); if (o == NULL) { return NULL; } o->ag_finalizer = NULL; o->ag_closed = 0; o->ag_hooks_inited = 0; return (PyObject*)o; } int PyAsyncGen_ClearFreeLists(void) { int ret = ag_value_freelist_free + ag_asend_freelist_free; while (ag_value_freelist_free) { _PyAsyncGenWrappedValue *o; o = ag_value_freelist[--ag_value_freelist_free]; assert(_PyAsyncGenWrappedValue_CheckExact(o)); PyObject_GC_Del(o); } while (ag_asend_freelist_free) { PyAsyncGenASend *o; o = ag_asend_freelist[--ag_asend_freelist_free]; assert(Py_TYPE(o) == &_PyAsyncGenASend_Type); PyObject_GC_Del(o); } return ret; } void PyAsyncGen_Fini(void) { PyAsyncGen_ClearFreeLists(); } static PyObject * async_gen_unwrap_value(PyAsyncGenObject *gen, PyObject *result) { if (result == NULL) { if (!PyErr_Occurred()) { PyErr_SetNone(PyExc_StopAsyncIteration); } if (PyErr_ExceptionMatches(PyExc_StopAsyncIteration) || PyErr_ExceptionMatches(PyExc_GeneratorExit) ) { gen->ag_closed = 1; } return NULL; } if (_PyAsyncGenWrappedValue_CheckExact(result)) { /* async yield */ _PyGen_SetStopIterationValue(((_PyAsyncGenWrappedValue*)result)->agw_val); Py_DECREF(result); return NULL; } return result; } /* ---------- Async Generator ASend Awaitable ------------ */ static void async_gen_asend_dealloc(PyAsyncGenASend *o) { _PyObject_GC_UNTRACK((PyObject *)o); Py_CLEAR(o->ags_gen); Py_CLEAR(o->ags_sendval); if (ag_asend_freelist_free < _PyAsyncGen_MAXFREELIST) { assert(PyAsyncGenASend_CheckExact(o)); ag_asend_freelist[ag_asend_freelist_free++] = o; } else { PyObject_GC_Del(o); } } static int async_gen_asend_traverse(PyAsyncGenASend *o, visitproc visit, void *arg) { Py_VISIT(o->ags_gen); Py_VISIT(o->ags_sendval); return 0; } static PyObject * async_gen_asend_send(PyAsyncGenASend *o, PyObject *arg) { PyObject *result; if (o->ags_state == AWAITABLE_STATE_CLOSED) { PyErr_SetNone(PyExc_StopIteration); return NULL; } if (o->ags_state == AWAITABLE_STATE_INIT) { if (arg == NULL || arg == Py_None) { arg = o->ags_sendval; } o->ags_state = AWAITABLE_STATE_ITER; } result = gen_send_ex((PyGenObject*)o->ags_gen, arg, 0, 0); result = async_gen_unwrap_value(o->ags_gen, result); if (result == NULL) { o->ags_state = AWAITABLE_STATE_CLOSED; } return result; } static PyObject * async_gen_asend_iternext(PyAsyncGenASend *o) { return async_gen_asend_send(o, NULL); } static PyObject * async_gen_asend_throw(PyAsyncGenASend *o, PyObject *args) { PyObject *result; if (o->ags_state == AWAITABLE_STATE_CLOSED) { PyErr_SetNone(PyExc_StopIteration); return NULL; } result = gen_throw((PyGenObject*)o->ags_gen, args); result = async_gen_unwrap_value(o->ags_gen, result); if (result == NULL) { o->ags_state = AWAITABLE_STATE_CLOSED; } return result; } static PyObject * async_gen_asend_close(PyAsyncGenASend *o, PyObject *args) { o->ags_state = AWAITABLE_STATE_CLOSED; Py_RETURN_NONE; } static PyMethodDef async_gen_asend_methods[] = { {"send", (PyCFunction)async_gen_asend_send, METH_O, send_doc}, {"throw", (PyCFunction)async_gen_asend_throw, METH_VARARGS, throw_doc}, {"close", (PyCFunction)async_gen_asend_close, METH_NOARGS, close_doc}, {NULL, NULL} /* Sentinel */ }; static PyAsyncMethods async_gen_asend_as_async = { PyObject_SelfIter, /* am_await */ 0, /* am_aiter */ 0 /* am_anext */ }; PyTypeObject _PyAsyncGenASend_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "async_generator_asend", /* tp_name */ sizeof(PyAsyncGenASend), /* tp_basicsize */ 0, /* tp_itemsize */ /* methods */ (destructor)async_gen_asend_dealloc, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ &async_gen_asend_as_async, /* tp_as_async */ 0, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ 0, /* tp_doc */ (traverseproc)async_gen_asend_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ 0, /* tp_weaklistoffset */ PyObject_SelfIter, /* tp_iter */ (iternextfunc)async_gen_asend_iternext, /* tp_iternext */ async_gen_asend_methods, /* tp_methods */ 0, /* tp_members */ 0, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ 0, /* tp_descr_get */ 0, /* tp_descr_set */ 0, /* tp_dictoffset */ 0, /* tp_init */ 0, /* tp_alloc */ 0, /* tp_new */ }; static PyObject * async_gen_asend_new(PyAsyncGenObject *gen, PyObject *sendval) { PyAsyncGenASend *o; if (ag_asend_freelist_free) { ag_asend_freelist_free--; o = ag_asend_freelist[ag_asend_freelist_free]; _Py_NewReference((PyObject *)o); } else { o = PyObject_GC_New(PyAsyncGenASend, &_PyAsyncGenASend_Type); if (o == NULL) { return NULL; } } Py_INCREF(gen); o->ags_gen = gen; Py_XINCREF(sendval); o->ags_sendval = sendval; o->ags_state = AWAITABLE_STATE_INIT; _PyObject_GC_TRACK((PyObject*)o); return (PyObject*)o; } /* ---------- Async Generator Value Wrapper ------------ */ static void async_gen_wrapped_val_dealloc(_PyAsyncGenWrappedValue *o) { _PyObject_GC_UNTRACK((PyObject *)o); Py_CLEAR(o->agw_val); if (ag_value_freelist_free < _PyAsyncGen_MAXFREELIST) { assert(_PyAsyncGenWrappedValue_CheckExact(o)); ag_value_freelist[ag_value_freelist_free++] = o; } else { PyObject_GC_Del(o); } } static int async_gen_wrapped_val_traverse(_PyAsyncGenWrappedValue *o, visitproc visit, void *arg) { Py_VISIT(o->agw_val); return 0; } PyTypeObject _PyAsyncGenWrappedValue_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "async_generator_wrapped_value", /* tp_name */ sizeof(_PyAsyncGenWrappedValue), /* tp_basicsize */ 0, /* tp_itemsize */ /* methods */ (destructor)async_gen_wrapped_val_dealloc, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ 0, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ 0, /* tp_doc */ (traverseproc)async_gen_wrapped_val_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ 0, /* tp_weaklistoffset */ 0, /* tp_iter */ 0, /* tp_iternext */ 0, /* tp_methods */ 0, /* tp_members */ 0, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ 0, /* tp_descr_get */ 0, /* tp_descr_set */ 0, /* tp_dictoffset */ 0, /* tp_init */ 0, /* tp_alloc */ 0, /* tp_new */ }; PyObject * _PyAsyncGenValueWrapperNew(PyObject *val) { _PyAsyncGenWrappedValue *o; assert(val); if (ag_value_freelist_free) { ag_value_freelist_free--; o = ag_value_freelist[ag_value_freelist_free]; assert(_PyAsyncGenWrappedValue_CheckExact(o)); _Py_NewReference((PyObject*)o); } else { o = PyObject_GC_New(_PyAsyncGenWrappedValue, &_PyAsyncGenWrappedValue_Type); if (o == NULL) { return NULL; } } o->agw_val = val; Py_INCREF(val); _PyObject_GC_TRACK((PyObject*)o); return (PyObject*)o; } /* ---------- Async Generator AThrow awaitable ------------ */ static void async_gen_athrow_dealloc(PyAsyncGenAThrow *o) { _PyObject_GC_UNTRACK((PyObject *)o); Py_CLEAR(o->agt_gen); Py_CLEAR(o->agt_args); PyObject_GC_Del(o); } static int async_gen_athrow_traverse(PyAsyncGenAThrow *o, visitproc visit, void *arg) { Py_VISIT(o->agt_gen); Py_VISIT(o->agt_args); return 0; } static PyObject * async_gen_athrow_send(PyAsyncGenAThrow *o, PyObject *arg) { PyGenObject *gen = (PyGenObject*)o->agt_gen; PyFrameObject *f = gen->gi_frame; PyObject *retval; if (f == NULL || f->f_stacktop == NULL || o->agt_state == AWAITABLE_STATE_CLOSED) { PyErr_SetNone(PyExc_StopIteration); return NULL; } if (o->agt_state == AWAITABLE_STATE_INIT) { if (o->agt_gen->ag_closed) { PyErr_SetNone(PyExc_StopIteration); return NULL; } if (arg != Py_None) { PyErr_SetString(PyExc_RuntimeError, NON_INIT_CORO_MSG); return NULL; } o->agt_state = AWAITABLE_STATE_ITER; if (o->agt_args == NULL) { /* aclose() mode */ o->agt_gen->ag_closed = 1; retval = _gen_throw((PyGenObject *)gen, 0, /* Do not close generator when PyExc_GeneratorExit is passed */ PyExc_GeneratorExit, NULL, NULL); if (retval && _PyAsyncGenWrappedValue_CheckExact(retval)) { Py_DECREF(retval); goto yield_close; } } else { PyObject *typ; PyObject *tb = NULL; PyObject *val = NULL; if (!PyArg_UnpackTuple(o->agt_args, "athrow", 1, 3, &typ, &val, &tb)) { return NULL; } retval = _gen_throw((PyGenObject *)gen, 0, /* Do not close generator when PyExc_GeneratorExit is passed */ typ, val, tb); retval = async_gen_unwrap_value(o->agt_gen, retval); } if (retval == NULL) { goto check_error; } return retval; } assert(o->agt_state == AWAITABLE_STATE_ITER); retval = gen_send_ex((PyGenObject *)gen, arg, 0, 0); if (o->agt_args) { return async_gen_unwrap_value(o->agt_gen, retval); } else { /* aclose() mode */ if (retval) { if (_PyAsyncGenWrappedValue_CheckExact(retval)) { Py_DECREF(retval); goto yield_close; } else { return retval; } } else { goto check_error; } } yield_close: PyErr_SetString( PyExc_RuntimeError, ASYNC_GEN_IGNORED_EXIT_MSG); return NULL; check_error: if (PyErr_ExceptionMatches(PyExc_StopAsyncIteration)) { o->agt_state = AWAITABLE_STATE_CLOSED; if (o->agt_args == NULL) { /* when aclose() is called we don't want to propagate StopAsyncIteration; just raise StopIteration, signalling that 'aclose()' is done. */ PyErr_Clear(); PyErr_SetNone(PyExc_StopIteration); } } else if (PyErr_ExceptionMatches(PyExc_GeneratorExit)) { o->agt_state = AWAITABLE_STATE_CLOSED; PyErr_Clear(); /* ignore these errors */ PyErr_SetNone(PyExc_StopIteration); } return NULL; } static PyObject * async_gen_athrow_throw(PyAsyncGenAThrow *o, PyObject *args) { PyObject *retval; if (o->agt_state == AWAITABLE_STATE_INIT) { PyErr_SetString(PyExc_RuntimeError, NON_INIT_CORO_MSG); return NULL; } if (o->agt_state == AWAITABLE_STATE_CLOSED) { PyErr_SetNone(PyExc_StopIteration); return NULL; } retval = gen_throw((PyGenObject*)o->agt_gen, args); if (o->agt_args) { return async_gen_unwrap_value(o->agt_gen, retval); } else { /* aclose() mode */ if (retval && _PyAsyncGenWrappedValue_CheckExact(retval)) { Py_DECREF(retval); PyErr_SetString(PyExc_RuntimeError, ASYNC_GEN_IGNORED_EXIT_MSG); return NULL; } return retval; } } static PyObject * async_gen_athrow_iternext(PyAsyncGenAThrow *o) { return async_gen_athrow_send(o, Py_None); } static PyObject * async_gen_athrow_close(PyAsyncGenAThrow *o, PyObject *args) { o->agt_state = AWAITABLE_STATE_CLOSED; Py_RETURN_NONE; } static PyMethodDef async_gen_athrow_methods[] = { {"send", (PyCFunction)async_gen_athrow_send, METH_O, send_doc}, {"throw", (PyCFunction)async_gen_athrow_throw, METH_VARARGS, throw_doc}, {"close", (PyCFunction)async_gen_athrow_close, METH_NOARGS, close_doc}, {NULL, NULL} /* Sentinel */ }; static PyAsyncMethods async_gen_athrow_as_async = { PyObject_SelfIter, /* am_await */ 0, /* am_aiter */ 0 /* am_anext */ }; PyTypeObject _PyAsyncGenAThrow_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "async_generator_athrow", /* tp_name */ sizeof(PyAsyncGenAThrow), /* tp_basicsize */ 0, /* tp_itemsize */ /* methods */ (destructor)async_gen_athrow_dealloc, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ &async_gen_athrow_as_async, /* tp_as_async */ 0, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ 0, /* tp_doc */ (traverseproc)async_gen_athrow_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ 0, /* tp_weaklistoffset */ PyObject_SelfIter, /* tp_iter */ (iternextfunc)async_gen_athrow_iternext, /* tp_iternext */ async_gen_athrow_methods, /* tp_methods */ 0, /* tp_members */ 0, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ 0, /* tp_descr_get */ 0, /* tp_descr_set */ 0, /* tp_dictoffset */ 0, /* tp_init */ 0, /* tp_alloc */ 0, /* tp_new */ }; static PyObject * async_gen_athrow_new(PyAsyncGenObject *gen, PyObject *args) { PyAsyncGenAThrow *o; o = PyObject_GC_New(PyAsyncGenAThrow, &_PyAsyncGenAThrow_Type); if (o == NULL) { return NULL; } o->agt_gen = gen; o->agt_args = args; o->agt_state = AWAITABLE_STATE_INIT; Py_INCREF(gen); Py_XINCREF(args); _PyObject_GC_TRACK((PyObject*)o); return (PyObject*)o; }