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genobject.c
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/* Generator object implementation */
#define _PY_INTERPRETER
#include "Python.h"
#include "pycore_call.h" // _PyObject_CallNoArgs()
#include "pycore_ceval.h" // _PyEval_EvalFrame()
#include "pycore_frame.h" // _PyInterpreterFrame
#include "pycore_genobject.h" // struct _Py_async_gen_state
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
#include "pycore_pyerrors.h" // _PyErr_ClearExcState()
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "structmember.h" // PyMemberDef
#include "opcode.h" // SEND
#include "pystats.h"
static PyObject *gen_close(PyGenObject *, PyObject *);
static PyObject *async_gen_asend_new(PyAsyncGenObject *, PyObject *);
static PyObject *async_gen_athrow_new(PyAsyncGenObject *, PyObject *);
static const char *NON_INIT_CORO_MSG = "can't send non-None value to a "
"just-started coroutine";
static const char *ASYNC_GEN_IGNORED_EXIT_MSG =
"async generator ignored GeneratorExit";
static inline int
exc_state_traverse(_PyErr_StackItem *exc_state, visitproc visit, void *arg)
{
Py_VISIT(exc_state->exc_value);
return 0;
}
static int
gen_traverse(PyGenObject *gen, visitproc visit, void *arg)
{
Py_VISIT(gen->gi_code);
Py_VISIT(gen->gi_name);
Py_VISIT(gen->gi_qualname);
if (gen->gi_frame_state < FRAME_CLEARED) {
_PyInterpreterFrame *frame = (_PyInterpreterFrame *)(gen->gi_iframe);
assert(frame->frame_obj == NULL ||
frame->frame_obj->f_frame->owner == FRAME_OWNED_BY_GENERATOR);
int err = _PyFrame_Traverse(frame, visit, arg);
if (err) {
return err;
}
}
/* No need to visit cr_origin, because it's just tuples/str/int, so can't
participate in a reference cycle. */
return exc_state_traverse(&gen->gi_exc_state, visit, arg);
}
void
_PyGen_Finalize(PyObject *self)
{
PyGenObject *gen = (PyGenObject *)self;
PyObject *res = NULL;
PyObject *error_type, *error_value, *error_traceback;
if (gen->gi_frame_state >= FRAME_COMPLETED) {
/* Generator isn't paused, so no need to close */
return;
}
if (PyAsyncGen_CheckExact(self)) {
PyAsyncGenObject *agen = (PyAsyncGenObject*)self;
PyObject *finalizer = agen->ag_origin_or_finalizer;
if (finalizer && !agen->ag_closed) {
/* Save the current exception, if any. */
PyErr_Fetch(&error_type, &error_value, &error_traceback);
res = PyObject_CallOneArg(finalizer, self);
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_state == FRAME_CREATED)
{
_PyErr_WarnUnawaitedCoroutine((PyObject *)gen);
}
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_origin_or_finalizer);
}
if (gen->gi_frame_state < FRAME_CLEARED) {
_PyInterpreterFrame *frame = (_PyInterpreterFrame *)gen->gi_iframe;
gen->gi_frame_state = FRAME_CLEARED;
frame->previous = NULL;
_PyFrame_Clear(frame);
}
if (((PyCodeObject *)gen->gi_code)->co_flags & CO_COROUTINE) {
Py_CLEAR(((PyCoroObject *)gen)->cr_origin_or_finalizer);
}
Py_CLEAR(gen->gi_code);
Py_CLEAR(gen->gi_name);
Py_CLEAR(gen->gi_qualname);
_PyErr_ClearExcState(&gen->gi_exc_state);
PyObject_GC_Del(gen);
}
static PySendResult
gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
int exc, int closing)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyInterpreterFrame *frame = (_PyInterpreterFrame *)gen->gi_iframe;
PyObject *result;
*presult = NULL;
if (gen->gi_frame_state == FRAME_CREATED && arg && arg != Py_None) {
const 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 PYGEN_ERROR;
}
if (gen->gi_frame_state == FRAME_EXECUTING) {
const 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 PYGEN_ERROR;
}
if (gen->gi_frame_state >= FRAME_COMPLETED) {
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 return value if called from send(). */
*presult = Py_NewRef(Py_None);
return PYGEN_RETURN;
}
return PYGEN_ERROR;
}
assert(gen->gi_frame_state < FRAME_EXECUTING);
/* Push arg onto the frame's value stack */
result = arg ? arg : Py_None;
_PyFrame_StackPush(frame, Py_NewRef(result));
_PyErr_StackItem *prev_exc_info = tstate->exc_info;
gen->gi_exc_state.previous_item = prev_exc_info;
tstate->exc_info = &gen->gi_exc_state;
if (exc) {
assert(_PyErr_Occurred(tstate));
_PyErr_ChainStackItem(NULL);
}
gen->gi_frame_state = FRAME_EXECUTING;
EVAL_CALL_STAT_INC(EVAL_CALL_GENERATOR);
result = _PyEval_EvalFrame(tstate, frame, exc);
assert(tstate->exc_info == prev_exc_info);
assert(gen->gi_exc_state.previous_item == NULL);
assert(gen->gi_frame_state != FRAME_EXECUTING);
assert(frame->previous == NULL);
/* If the generator just returned (as opposed to yielding), signal
* that the generator is exhausted. */
if (result) {
if (gen->gi_frame_state == FRAME_SUSPENDED) {
*presult = result;
return PYGEN_NEXT;
}
assert(result == Py_None || !PyAsyncGen_CheckExact(gen));
if (result == Py_None && !PyAsyncGen_CheckExact(gen) && !arg) {
/* Return NULL if called by gen_iternext() */
Py_CLEAR(result);
}
}
else {
assert(!PyErr_ExceptionMatches(PyExc_StopIteration));
assert(!PyAsyncGen_CheckExact(gen) ||
!PyErr_ExceptionMatches(PyExc_StopAsyncIteration));
}
/* generator can't be rerun, so release the frame */
/* first clean reference cycle through stored exception traceback */
_PyErr_ClearExcState(&gen->gi_exc_state);
assert(gen->gi_frame_state == FRAME_CLEARED);
*presult = result;
return result ? PYGEN_RETURN : PYGEN_ERROR;
}
static PySendResult
PyGen_am_send(PyGenObject *gen, PyObject *arg, PyObject **result)
{
return gen_send_ex2(gen, arg, result, 0, 0);
}
static PyObject *
gen_send_ex(PyGenObject *gen, PyObject *arg, int exc, int closing)
{
PyObject *result;
if (gen_send_ex2(gen, arg, &result, exc, closing) == PYGEN_RETURN) {
if (PyAsyncGen_CheckExact(gen)) {
assert(result == Py_None);
PyErr_SetNone(PyExc_StopAsyncIteration);
}
else if (result == Py_None) {
PyErr_SetNone(PyExc_StopIteration);
}
else {
_PyGen_SetStopIterationValue(result);
}
Py_CLEAR(result);
}
return result;
}
PyDoc_STRVAR(send_doc,
"send(arg) -> send 'arg' into generator,\n\
return next yielded value or raise StopIteration.");
static PyObject *
gen_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;
if (PyGen_CheckExact(yf) || PyCoro_CheckExact(yf)) {
retval = gen_close((PyGenObject *)yf, NULL);
if (retval == NULL)
return -1;
}
else {
PyObject *meth;
if (_PyObject_LookupAttr(yf, &_Py_ID(close), &meth) < 0) {
PyErr_WriteUnraisable(yf);
}
if (meth) {
retval = _PyObject_CallNoArgs(meth);
Py_DECREF(meth);
if (retval == NULL)
return -1;
}
}
Py_XDECREF(retval);
return 0;
}
PyObject *
_PyGen_yf(PyGenObject *gen)
{
PyObject *yf = NULL;
if (gen->gi_frame_state < FRAME_CLEARED) {
_PyInterpreterFrame *frame = (_PyInterpreterFrame *)gen->gi_iframe;
if (gen->gi_frame_state == FRAME_CREATED) {
/* Return immediately if the frame didn't start yet. SEND
always come after LOAD_CONST: a code object should not start
with SEND */
assert(_Py_OPCODE(_PyCode_CODE(gen->gi_code)[0]) != SEND);
return NULL;
}
_Py_CODEUNIT next = frame->prev_instr[1];
if (_Py_OPCODE(next) != RESUME || _Py_OPARG(next) < 2)
{
/* Not in a yield from */
return NULL;
}
yf = Py_NewRef(_PyFrame_StackPeek(frame));
}
return yf;
}
static PyObject *
gen_close(PyGenObject *gen, PyObject *args)
{
PyObject *retval;
PyObject *yf = _PyGen_yf(gen);
int err = 0;
if (yf) {
PyFrameState state = gen->gi_frame_state;
gen->gi_frame_state = FRAME_EXECUTING;
err = gen_close_iter(yf);
gen->gi_frame_state = state;
Py_DECREF(yf);
}
if (err == 0)
PyErr_SetNone(PyExc_GeneratorExit);
retval = gen_send_ex(gen, Py_None, 1, 1);
if (retval) {
const 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_RETURN_NONE;
}
return NULL;
}
PyDoc_STRVAR(throw_doc,
"throw(value)\n\
throw(type[,value[,tb]])\n\
\n\
Raise exception in generator, return next yielded value or raise\n\
StopIteration.\n\
the (type, val, tb) signature is deprecated, \n\
and may be removed in a future version of Python.");
static PyObject *
_gen_throw(PyGenObject *gen, int close_on_genexit,
PyObject *typ, PyObject *val, PyObject *tb)
{
PyObject *yf = _PyGen_yf(gen);
if (yf) {
_PyInterpreterFrame *frame = (_PyInterpreterFrame *)gen->gi_iframe;
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.
*/
PyFrameState state = gen->gi_frame_state;
gen->gi_frame_state = FRAME_EXECUTING;
err = gen_close_iter(yf);
gen->gi_frame_state = state;
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. */
PyThreadState *tstate = _PyThreadState_GET();
/* Since we are fast-tracking things by skipping the eval loop,
we need to update the current frame so the stack trace
will be reported correctly to the user. */
/* XXX We should probably be updating the current frame
somewhere in ceval.c. */
_PyInterpreterFrame *prev = tstate->cframe->current_frame;
frame->previous = prev;
tstate->cframe->current_frame = frame;
/* Close the generator that we are currently iterating with
'yield from' or awaiting on with 'await'. */
PyFrameState state = gen->gi_frame_state;
gen->gi_frame_state = FRAME_EXECUTING;
ret = _gen_throw((PyGenObject *)yf, close_on_genexit,
typ, val, tb);
gen->gi_frame_state = state;
tstate->cframe->current_frame = prev;
frame->previous = NULL;
} else {
/* `yf` is an iterator or a coroutine-like object. */
PyObject *meth;
if (_PyObject_LookupAttr(yf, &_Py_ID(throw), &meth) < 0) {
Py_DECREF(yf);
return NULL;
}
if (meth == NULL) {
Py_DECREF(yf);
goto throw_here;
}
PyFrameState state = gen->gi_frame_state;
gen->gi_frame_state = FRAME_EXECUTING;
ret = PyObject_CallFunctionObjArgs(meth, typ, val, tb, NULL);
gen->gi_frame_state = state;
Py_DECREF(meth);
}
Py_DECREF(yf);
if (!ret) {
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 <class>, <instance> */
Py_XSETREF(val, typ);
typ = Py_NewRef(PyExceptionInstance_Class(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 *const *args, Py_ssize_t nargs)
{
PyObject *typ;
PyObject *tb = NULL;
PyObject *val = NULL;
if (!_PyArg_CheckPositional("throw", nargs, 1, 3)) {
return NULL;
}
if (nargs > 1) {
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"the (type, exc, tb) signature of throw() is deprecated, "
"use the single-arg signature instead.",
1) < 0) {
return NULL;
}
}
typ = args[0];
if (nargs == 3) {
val = args[1];
tb = args[2];
}
else if (nargs == 2) {
val = args[1];
}
return _gen_throw(gen, 1, typ, val, tb);
}
static PyObject *
gen_iternext(PyGenObject *gen)
{
PyObject *result;
assert(PyGen_CheckExact(gen) || PyCoro_CheckExact(gen));
if (gen_send_ex2(gen, NULL, &result, 0, 0) == PYGEN_RETURN) {
if (result != Py_None) {
_PyGen_SetStopIterationValue(result);
}
Py_CLEAR(result);
}
return result;
}
/*
* 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) && !PyExceptionInstance_Check(value)))
{
/* Delay exception instantiation if we can */
PyErr_SetObject(PyExc_StopIteration, value);
return 0;
}
/* Construct an exception instance manually with
* PyObject_CallOneArg 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_CallOneArg(PyExc_StopIteration, value);
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 = Py_NewRef(((PyStopIterationObject *)ev)->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 = Py_NewRef(((PyStopIterationObject *)ev)->value);
Py_DECREF(ev);
}
}
Py_XDECREF(et);
Py_XDECREF(tb);
} else if (PyErr_Occurred()) {
return -1;
}
if (value == NULL) {
value = Py_NewRef(Py_None);
}
*pvalue = value;
return 0;
}
static PyObject *
gen_repr(PyGenObject *gen)
{
return PyUnicode_FromFormat("<generator object %S at %p>",
gen->gi_qualname, gen);
}
static PyObject *
gen_get_name(PyGenObject *op, void *Py_UNUSED(ignored))
{
return Py_NewRef(op->gi_name);
}
static int
gen_set_name(PyGenObject *op, PyObject *value, void *Py_UNUSED(ignored))
{
/* 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_XSETREF(op->gi_name, Py_NewRef(value));
return 0;
}
static PyObject *
gen_get_qualname(PyGenObject *op, void *Py_UNUSED(ignored))
{
return Py_NewRef(op->gi_qualname);
}
static int
gen_set_qualname(PyGenObject *op, PyObject *value, void *Py_UNUSED(ignored))
{
/* 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_XSETREF(op->gi_qualname, Py_NewRef(value));
return 0;
}
static PyObject *
gen_getyieldfrom(PyGenObject *gen, void *Py_UNUSED(ignored))
{
PyObject *yf = _PyGen_yf(gen);
if (yf == NULL)
Py_RETURN_NONE;
return yf;
}
static PyObject *
gen_getrunning(PyGenObject *gen, void *Py_UNUSED(ignored))
{
if (gen->gi_frame_state == FRAME_EXECUTING) {
Py_RETURN_TRUE;
}
Py_RETURN_FALSE;
}
static PyObject *
gen_getsuspended(PyGenObject *gen, void *Py_UNUSED(ignored))
{
return PyBool_FromLong(gen->gi_frame_state == FRAME_SUSPENDED);
}
static PyObject *
_gen_getframe(PyGenObject *gen, const char *const name)
{
if (PySys_Audit("object.__getattr__", "Os", gen, name) < 0) {
return NULL;
}
if (gen->gi_frame_state == FRAME_CLEARED) {
Py_RETURN_NONE;
}
return _Py_XNewRef((PyObject *)_PyFrame_GetFrameObject((_PyInterpreterFrame *)gen->gi_iframe));
}
static PyObject *
gen_getframe(PyGenObject *gen, void *Py_UNUSED(ignored))
{
return _gen_getframe(gen, "gi_frame");
}
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")},
{"gi_running", (getter)gen_getrunning, NULL, NULL},
{"gi_frame", (getter)gen_getframe, NULL, NULL},
{"gi_suspended", (getter)gen_getsuspended, NULL, NULL},
{NULL} /* Sentinel */
};
static PyMemberDef gen_memberlist[] = {
{"gi_code", T_OBJECT, offsetof(PyGenObject, gi_code), READONLY|PY_AUDIT_READ},
{NULL} /* Sentinel */
};
static PyObject *
gen_sizeof(PyGenObject *gen, PyObject *Py_UNUSED(ignored))
{
Py_ssize_t res;
res = offsetof(PyGenObject, gi_iframe) + offsetof(_PyInterpreterFrame, localsplus);
PyCodeObject *code = gen->gi_code;
res += _PyFrame_NumSlotsForCodeObject(code) * sizeof(PyObject *);
return PyLong_FromSsize_t(res);
}
PyDoc_STRVAR(sizeof__doc__,
"gen.__sizeof__() -> size of gen in memory, in bytes");
static PyMethodDef gen_methods[] = {
{"send",(PyCFunction)gen_send, METH_O, send_doc},
{"throw",_PyCFunction_CAST(gen_throw), METH_FASTCALL, throw_doc},
{"close",(PyCFunction)gen_close, METH_NOARGS, close_doc},
{"__sizeof__", (PyCFunction)gen_sizeof, METH_NOARGS, sizeof__doc__},
{NULL, NULL} /* Sentinel */
};
static PyAsyncMethods gen_as_async = {
0, /* am_await */
0, /* am_aiter */
0, /* am_anext */
(sendfunc)PyGen_am_send, /* am_send */
};
PyTypeObject PyGen_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"generator", /* tp_name */
offsetof(PyGenObject, gi_iframe) +
offsetof(_PyInterpreterFrame, localsplus), /* tp_basicsize */
sizeof(PyObject *), /* tp_itemsize */
/* methods */
(destructor)gen_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
&gen_as_async, /* 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, /* 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 *
make_gen(PyTypeObject *type, PyFunctionObject *func)
{
PyCodeObject *code = (PyCodeObject *)func->func_code;
int slots = _PyFrame_NumSlotsForCodeObject(code);
PyGenObject *gen = PyObject_GC_NewVar(PyGenObject, type, slots);
if (gen == NULL) {
return NULL;
}
gen->gi_frame_state = FRAME_CLEARED;
gen->gi_code = (PyCodeObject *)Py_NewRef(func->func_code);
gen->gi_weakreflist = NULL;
gen->gi_exc_state.exc_value = NULL;
gen->gi_exc_state.previous_item = NULL;
assert(func->func_name != NULL);
gen->gi_name = Py_NewRef(func->func_name);
assert(func->func_qualname != NULL);
gen->gi_qualname = Py_NewRef(func->func_qualname);
_PyObject_GC_TRACK(gen);
return (PyObject *)gen;
}
static PyObject *
compute_cr_origin(int origin_depth, _PyInterpreterFrame *current_frame);
PyObject *
_Py_MakeCoro(PyFunctionObject *func)
{
int coro_flags = ((PyCodeObject *)func->func_code)->co_flags &
(CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR);
assert(coro_flags);
if (coro_flags == CO_GENERATOR) {
return make_gen(&PyGen_Type, func);
}
if (coro_flags == CO_ASYNC_GENERATOR) {
PyAsyncGenObject *o;
o = (PyAsyncGenObject *)make_gen(&PyAsyncGen_Type, func);
if (o == NULL) {
return NULL;
}
o->ag_origin_or_finalizer = NULL;
o->ag_closed = 0;
o->ag_hooks_inited = 0;
o->ag_running_async = 0;
return (PyObject*)o;
}
assert (coro_flags == CO_COROUTINE);
PyObject *coro = make_gen(&PyCoro_Type, func);
if (!coro) {
return NULL;
}
PyThreadState *tstate = _PyThreadState_GET();
int origin_depth = tstate->coroutine_origin_tracking_depth;
if (origin_depth == 0) {
((PyCoroObject *)coro)->cr_origin_or_finalizer = NULL;
} else {
_PyInterpreterFrame *frame = tstate->cframe->current_frame;
assert(frame);
assert(_PyFrame_IsIncomplete(frame));
frame = _PyFrame_GetFirstComplete(frame->previous);
PyObject *cr_origin = compute_cr_origin(origin_depth, frame);
((PyCoroObject *)coro)->cr_origin_or_finalizer = cr_origin;
if (!cr_origin) {
Py_DECREF(coro);
return NULL;
}
}
return coro;
}
static PyObject *
gen_new_with_qualname(PyTypeObject *type, PyFrameObject *f,
PyObject *name, PyObject *qualname)
{
PyCodeObject *code = f->f_frame->f_code;
int size = code->co_nlocalsplus + code->co_stacksize;
PyGenObject *gen = PyObject_GC_NewVar(PyGenObject, type, size);
if (gen == NULL) {
Py_DECREF(f);
return NULL;
}
/* Copy the frame */
assert(f->f_frame->frame_obj == NULL);
assert(f->f_frame->owner == FRAME_OWNED_BY_FRAME_OBJECT);
_PyInterpreterFrame *frame = (_PyInterpreterFrame *)gen->gi_iframe;
_PyFrame_Copy((_PyInterpreterFrame *)f->_f_frame_data, frame);
gen->gi_frame_state = FRAME_CREATED;
assert(frame->frame_obj == f);
f->f_frame = frame;
frame->owner = FRAME_OWNED_BY_GENERATOR;
assert(PyObject_GC_IsTracked((PyObject *)f));
gen->gi_code = PyFrame_GetCode(f);
Py_INCREF(gen->gi_code);
Py_DECREF(f);
gen->gi_weakreflist = NULL;
gen->gi_exc_state.exc_value = NULL;
gen->gi_exc_state.previous_item = NULL;
if (name != NULL)
gen->gi_name = Py_NewRef(name);
else
gen->gi_name = Py_NewRef(gen->gi_code->co_name);
if (qualname != NULL)
gen->gi_qualname = Py_NewRef(qualname);
else
gen->gi_qualname = Py_NewRef(gen->gi_code->co_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);
}
/* 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)
{