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7c30d12bd5
cpython/Objects/genobject.c
Chris Jerdonek 7c30d12bd5
bpo-40696: Fix a hang that can arise after gen.throw() (GH-20287) 
This updates _PyErr_ChainStackItem() to use _PyErr_SetObject()
instead of _PyErr_ChainExceptions(). This prevents a hang in
certain circumstances because _PyErr_SetObject() performs checks
to prevent cycles in the exception context chain while
_PyErr_ChainExceptions() doesn't.
2020-05-22 13:33:27 -07:00

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/* Generator object implementation */
#include "Python.h"
#include "pycore_ceval.h" // _PyEval_EvalFrame()
#include "pycore_object.h"
#include "pycore_pyerrors.h" // _PyErr_ClearExcState()
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "frameobject.h"
#include "structmember.h" // PyMemberDef
#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 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_type);
Py_VISIT(exc_state->exc_value);
Py_VISIT(exc_state->exc_traceback);
return 0;
}
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);
/* 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 == 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_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->f_lasti == -1)
{
_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_finalizer);
}
if (gen->gi_frame != NULL) {
gen->gi_frame->f_gen = NULL;
Py_CLEAR(gen->gi_frame);
}
if (((PyCodeObject *)gen->gi_code)->co_flags & CO_COROUTINE) {
Py_CLEAR(((PyCoroObject *)gen)->cr_origin);
}
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 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) {
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 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) {
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 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;
gen->gi_exc_state.previous_item = tstate->exc_info;
tstate->exc_info = &gen->gi_exc_state;
if (exc) {
assert(_PyErr_Occurred(tstate));
_PyErr_ChainStackItem(NULL);
}
result = _PyEval_EvalFrame(tstate, f, exc);
tstate->exc_info = gen->gi_exc_state.previous_item;
gen->gi_exc_state.previous_item = NULL;
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)) {
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 if (!result && PyAsyncGen_CheckExact(gen) &&
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 */
_PyErr_ClearExcState(&gen->gi_exc_state);
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;
if (_PyObject_LookupAttrId(yf, &PyId_close, &meth) < 0) {
PyErr_WriteUnraisable(yf);
}
if (meth) {
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 (f->f_lasti < 0) {
/* Return immediately if the frame didn't start yet. YIELD_FROM
always come after LOAD_CONST: a code object should not start
with YIELD_FROM */
assert(code[0] != YIELD_FROM);
return NULL;
}
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) {
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(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;
if (_PyObject_LookupAttrId(yf, &PyId_throw, &meth) < 0) {
Py_DECREF(yf);
return NULL;
}
if (meth == NULL) {
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 */
assert(gen->gi_frame->f_lasti >= 0);
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 <class>, <instance> */
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) && !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 = ((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("<generator object %S at %p>",
gen->gi_qualname, gen);
}
static PyObject *
gen_get_name(PyGenObject *op, void *Py_UNUSED(ignored))
{
Py_INCREF(op->gi_name);
return 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_INCREF(value);
Py_XSETREF(op->gi_name, value);
return 0;
}
static PyObject *
gen_get_qualname(PyGenObject *op, void *Py_UNUSED(ignored))
{
Py_INCREF(op->gi_qualname);
return 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_INCREF(value);
Py_XSETREF(op->gi_qualname, 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 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_vectorcall_offset */
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, /* 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;
gen->gi_exc_state.exc_type = NULL;
gen->gi_exc_state.exc_value = NULL;
gen->gi_exc_state.exc_traceback = NULL;
gen->gi_exc_state.previous_item = 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);
}
/* 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("<coroutine object %S at %p>",
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, void *Py_UNUSED(ignored))
{
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},
{"cr_origin", T_OBJECT, offsetof(PyCoroObject, cr_origin), 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_vectorcall_offset */
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, /* 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_vectorcall_offset */
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 */
};
static PyObject *
compute_cr_origin(int origin_depth)
{
PyFrameObject *frame = PyEval_GetFrame();
/* First count how many frames we have */
int frame_count = 0;
for (; frame && frame_count < origin_depth; ++frame_count) {
frame = frame->f_back;
}
/* Now collect them */
PyObject *cr_origin = PyTuple_New(frame_count);
if (cr_origin == NULL) {
return NULL;
}
frame = PyEval_GetFrame();
for (int i = 0; i < frame_count; ++i) {
PyCodeObject *code = frame->f_code;
PyObject *frameinfo = Py_BuildValue("OiO",
code->co_filename,
PyFrame_GetLineNumber(frame),
code->co_name);
if (!frameinfo) {
Py_DECREF(cr_origin);
return NULL;
}
PyTuple_SET_ITEM(cr_origin, i, frameinfo);
frame = frame->f_back;
}
return cr_origin;
}
PyObject *
PyCoro_New(PyFrameObject *f, PyObject *name, PyObject *qualname)
{
PyObject *coro = gen_new_with_qualname(&PyCoro_Type, f, name, qualname);
if (!coro) {
return NULL;
}
PyThreadState *tstate = _PyThreadState_GET();
int origin_depth = tstate->coroutine_origin_tracking_depth;
if (origin_depth == 0) {
((PyCoroObject *)coro)->cr_origin = NULL;
} else {
PyObject *cr_origin = compute_cr_origin(origin_depth);
((PyCoroObject *)coro)->cr_origin = cr_origin;
if (!cr_origin) {
Py_DECREF(coro);
return NULL;
}
}
return coro;
}
/* ========= 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_IS_TYPE(o, &_PyAsyncGenWrappedValue_Type)
#define PyAsyncGenASend_CheckExact(o) \
Py_IS_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("<async_generator object %S at %p>",
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_CallOneArg(firstiter, (PyObject *)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_async),
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},
{"__class_getitem__", (PyCFunction)Py_GenericAlias,
METH_O|METH_CLASS, PyDoc_STR("See PEP 585")},
{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_vectorcall_offset */
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, /* 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;
o->ag_running_async = 0;
return (PyObject*)o;
}
void
_PyAsyncGen_ClearFreeLists(void)
{
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_IS_TYPE(o, &_PyAsyncGenASend_Type));
PyObject_GC_Del(o);
}
}
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;
}
gen->ag_running_async = 0;
return NULL;
}
if (_PyAsyncGenWrappedValue_CheckExact(result)) {
/* async yield */
_PyGen_SetStopIterationValue(((_PyAsyncGenWrappedValue*)result)->agw_val);
Py_DECREF(result);
gen->ag_running_async = 0;
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_SetString(
PyExc_RuntimeError,
"cannot reuse already awaited __anext__()/asend()");
return NULL;
}
if (o->ags_state == AWAITABLE_STATE_INIT) {
if (o->ags_gen->ag_running_async) {
PyErr_SetString(
PyExc_RuntimeError,
"anext(): asynchronous generator is already running");
return NULL;
}
if (arg == NULL || arg == Py_None) {
arg = o->ags_sendval;
}
o->ags_state = AWAITABLE_STATE_ITER;
}
o->ags_gen->ag_running_async = 1;
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_SetString(
PyExc_RuntimeError,
"cannot reuse already awaited __anext__()/asend()");
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_vectorcall_offset */
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_vectorcall_offset */
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 (o->agt_state == AWAITABLE_STATE_CLOSED) {
PyErr_SetString(
PyExc_RuntimeError,
"cannot reuse already awaited aclose()/athrow()");
return NULL;
}
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_running_async) {
o->agt_state = AWAITABLE_STATE_CLOSED;
if (o->agt_args == NULL) {
PyErr_SetString(
PyExc_RuntimeError,
"aclose(): asynchronous generator is already running");
}
else {
PyErr_SetString(
PyExc_RuntimeError,
"athrow(): asynchronous generator is already running");
}
return NULL;
}
if (o->agt_gen->ag_closed) {
o->agt_state = AWAITABLE_STATE_CLOSED;
PyErr_SetNone(PyExc_StopAsyncIteration);
return NULL;
}
if (arg != Py_None) {
PyErr_SetString(PyExc_RuntimeError, NON_INIT_CORO_MSG);
return NULL;
}
o->agt_state = AWAITABLE_STATE_ITER;
o->agt_gen->ag_running_async = 1;
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:
o->agt_gen->ag_running_async = 0;
o->agt_state = AWAITABLE_STATE_CLOSED;
PyErr_SetString(
PyExc_RuntimeError, ASYNC_GEN_IGNORED_EXIT_MSG);
return NULL;
check_error:
o->agt_gen->ag_running_async = 0;
o->agt_state = AWAITABLE_STATE_CLOSED;
if (PyErr_ExceptionMatches(PyExc_StopAsyncIteration) ||
PyErr_ExceptionMatches(PyExc_GeneratorExit))
{
if (o->agt_args == NULL) {
/* when aclose() is called we don't want to propagate
StopAsyncIteration or GeneratorExit; just raise
StopIteration, signalling that this 'aclose()' await
is done.
*/
PyErr_Clear();
PyErr_SetNone(PyExc_StopIteration);
}
}
return NULL;
}
static PyObject *
async_gen_athrow_throw(PyAsyncGenAThrow *o, PyObject *args)
{
PyObject *retval;
if (o->agt_state == AWAITABLE_STATE_CLOSED) {
PyErr_SetString(
PyExc_RuntimeError,
"cannot reuse already awaited aclose()/athrow()");
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)) {
o->agt_gen->ag_running_async = 0;
o->agt_state = AWAITABLE_STATE_CLOSED;
Py_DECREF(retval);
PyErr_SetString(PyExc_RuntimeError, ASYNC_GEN_IGNORED_EXIT_MSG);
return NULL;
}
if (PyErr_ExceptionMatches(PyExc_StopAsyncIteration) ||
PyErr_ExceptionMatches(PyExc_GeneratorExit))
{
/* when aclose() is called we don't want to propagate
StopAsyncIteration or GeneratorExit; just raise
StopIteration, signalling that this 'aclose()' await
is done.
*/
PyErr_Clear();
PyErr_SetNone(PyExc_StopIteration);
}
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_vectorcall_offset */
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;
}
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