995 lines
33 KiB
C
995 lines
33 KiB
C
/* Generator object implementation */
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#include "Python.h"
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#include "frameobject.h"
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#include "structmember.h"
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#include "opcode.h"
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static PyObject *gen_close(PyGenObject *gen, PyObject *args);
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static int
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gen_traverse(PyGenObject *gen, visitproc visit, void *arg)
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{
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Py_VISIT((PyObject *)gen->gi_frame);
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Py_VISIT(gen->gi_code);
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Py_VISIT(gen->gi_name);
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Py_VISIT(gen->gi_qualname);
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return 0;
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}
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void
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_PyGen_Finalize(PyObject *self)
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{
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PyGenObject *gen = (PyGenObject *)self;
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PyObject *res;
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PyObject *error_type, *error_value, *error_traceback;
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/* If `gen` is a coroutine, and if it was never awaited on,
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issue a RuntimeWarning. */
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if (gen->gi_code != NULL
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&& ((PyCodeObject *)gen->gi_code)->co_flags & CO_COROUTINE
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&& gen->gi_frame != NULL
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&& gen->gi_frame->f_lasti == -1
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&& !PyErr_Occurred()
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&& PyErr_WarnFormat(PyExc_RuntimeWarning, 1,
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"coroutine '%.50S' was never awaited",
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gen->gi_qualname))
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return;
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if (gen->gi_frame == NULL || gen->gi_frame->f_stacktop == NULL)
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/* Generator isn't paused, so no need to close */
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return;
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/* Save the current exception, if any. */
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PyErr_Fetch(&error_type, &error_value, &error_traceback);
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res = gen_close(gen, NULL);
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if (res == NULL)
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PyErr_WriteUnraisable(self);
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else
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Py_DECREF(res);
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/* Restore the saved exception. */
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PyErr_Restore(error_type, error_value, error_traceback);
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}
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static void
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gen_dealloc(PyGenObject *gen)
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{
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PyObject *self = (PyObject *) gen;
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_PyObject_GC_UNTRACK(gen);
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if (gen->gi_weakreflist != NULL)
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PyObject_ClearWeakRefs(self);
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_PyObject_GC_TRACK(self);
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if (PyObject_CallFinalizerFromDealloc(self))
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return; /* resurrected. :( */
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_PyObject_GC_UNTRACK(self);
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Py_CLEAR(gen->gi_frame);
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Py_CLEAR(gen->gi_code);
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Py_CLEAR(gen->gi_name);
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Py_CLEAR(gen->gi_qualname);
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PyObject_GC_Del(gen);
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}
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static PyObject *
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gen_send_ex(PyGenObject *gen, PyObject *arg, int exc, int closing)
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{
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PyThreadState *tstate = PyThreadState_GET();
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PyFrameObject *f = gen->gi_frame;
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PyObject *result;
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if (gen->gi_running) {
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char *msg = "generator already executing";
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if (PyCoro_CheckExact(gen))
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msg = "coroutine already executing";
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PyErr_SetString(PyExc_ValueError, msg);
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return NULL;
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}
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if (f == NULL || f->f_stacktop == NULL) {
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if (PyCoro_CheckExact(gen) && !closing) {
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/* `gen` is an exhausted coroutine: raise an error,
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except when called from gen_close(), which should
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always be a silent method. */
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PyErr_SetString(
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PyExc_RuntimeError,
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"cannot reuse already awaited coroutine");
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} else if (arg && !exc) {
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/* `gen` is an exhausted generator:
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only set exception if called from send(). */
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PyErr_SetNone(PyExc_StopIteration);
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}
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return NULL;
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}
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if (f->f_lasti == -1) {
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if (arg && arg != Py_None) {
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char *msg = "can't send non-None value to a "
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"just-started generator";
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if (PyCoro_CheckExact(gen))
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msg = "can't send non-None value to a "
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"just-started coroutine";
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PyErr_SetString(PyExc_TypeError, msg);
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return NULL;
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}
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} else {
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/* Push arg onto the frame's value stack */
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result = arg ? arg : Py_None;
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Py_INCREF(result);
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*(f->f_stacktop++) = result;
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}
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/* Generators always return to their most recent caller, not
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* necessarily their creator. */
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Py_XINCREF(tstate->frame);
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assert(f->f_back == NULL);
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f->f_back = tstate->frame;
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gen->gi_running = 1;
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result = PyEval_EvalFrameEx(f, exc);
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gen->gi_running = 0;
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/* Don't keep the reference to f_back any longer than necessary. It
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* may keep a chain of frames alive or it could create a reference
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* cycle. */
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assert(f->f_back == tstate->frame);
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Py_CLEAR(f->f_back);
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/* If the generator just returned (as opposed to yielding), signal
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* that the generator is exhausted. */
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if (result && f->f_stacktop == NULL) {
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if (result == Py_None) {
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/* Delay exception instantiation if we can */
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PyErr_SetNone(PyExc_StopIteration);
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} else {
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PyObject *e = PyObject_CallFunctionObjArgs(
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PyExc_StopIteration, result, NULL);
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if (e != NULL) {
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PyErr_SetObject(PyExc_StopIteration, e);
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Py_DECREF(e);
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}
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}
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Py_CLEAR(result);
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}
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else if (!result && PyErr_ExceptionMatches(PyExc_StopIteration)) {
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/* Check for __future__ generator_stop and conditionally turn
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* a leaking StopIteration into RuntimeError (with its cause
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* set appropriately). */
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if (((PyCodeObject *)gen->gi_code)->co_flags &
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(CO_FUTURE_GENERATOR_STOP | CO_COROUTINE | CO_ITERABLE_COROUTINE))
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{
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PyObject *exc, *val, *val2, *tb;
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char *msg = "generator raised StopIteration";
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if (PyCoro_CheckExact(gen))
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msg = "coroutine raised StopIteration";
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PyErr_Fetch(&exc, &val, &tb);
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PyErr_NormalizeException(&exc, &val, &tb);
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if (tb != NULL)
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PyException_SetTraceback(val, tb);
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Py_DECREF(exc);
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Py_XDECREF(tb);
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PyErr_SetString(PyExc_RuntimeError, msg);
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PyErr_Fetch(&exc, &val2, &tb);
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PyErr_NormalizeException(&exc, &val2, &tb);
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Py_INCREF(val);
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PyException_SetCause(val2, val);
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PyException_SetContext(val2, val);
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PyErr_Restore(exc, val2, tb);
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}
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else {
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PyObject *exc, *val, *tb;
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/* Pop the exception before issuing a warning. */
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PyErr_Fetch(&exc, &val, &tb);
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if (PyErr_WarnFormat(PyExc_PendingDeprecationWarning, 1,
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"generator '%.50S' raised StopIteration",
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gen->gi_qualname)) {
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/* Warning was converted to an error. */
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Py_XDECREF(exc);
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Py_XDECREF(val);
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Py_XDECREF(tb);
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}
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else {
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PyErr_Restore(exc, val, tb);
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}
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}
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}
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if (!result || f->f_stacktop == NULL) {
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/* generator can't be rerun, so release the frame */
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/* first clean reference cycle through stored exception traceback */
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PyObject *t, *v, *tb;
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t = f->f_exc_type;
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v = f->f_exc_value;
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tb = f->f_exc_traceback;
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f->f_exc_type = NULL;
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f->f_exc_value = NULL;
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f->f_exc_traceback = NULL;
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Py_XDECREF(t);
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Py_XDECREF(v);
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Py_XDECREF(tb);
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gen->gi_frame->f_gen = NULL;
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gen->gi_frame = NULL;
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Py_DECREF(f);
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}
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return result;
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}
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PyDoc_STRVAR(send_doc,
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"send(arg) -> send 'arg' into generator,\n\
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return next yielded value or raise StopIteration.");
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PyObject *
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_PyGen_Send(PyGenObject *gen, PyObject *arg)
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{
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return gen_send_ex(gen, arg, 0, 0);
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}
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PyDoc_STRVAR(close_doc,
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"close() -> raise GeneratorExit inside generator.");
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/*
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* This helper function is used by gen_close and gen_throw to
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* close a subiterator being delegated to by yield-from.
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*/
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static int
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gen_close_iter(PyObject *yf)
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{
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PyObject *retval = NULL;
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_Py_IDENTIFIER(close);
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if (PyGen_CheckExact(yf)) {
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retval = gen_close((PyGenObject *)yf, NULL);
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if (retval == NULL)
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return -1;
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} else {
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PyObject *meth = _PyObject_GetAttrId(yf, &PyId_close);
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if (meth == NULL) {
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if (!PyErr_ExceptionMatches(PyExc_AttributeError))
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PyErr_WriteUnraisable(yf);
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PyErr_Clear();
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} else {
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retval = PyObject_CallFunction(meth, "");
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Py_DECREF(meth);
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if (retval == NULL)
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return -1;
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}
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}
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Py_XDECREF(retval);
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return 0;
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}
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PyObject *
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_PyGen_yf(PyGenObject *gen)
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{
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PyObject *yf = NULL;
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PyFrameObject *f = gen->gi_frame;
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if (f && f->f_stacktop) {
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PyObject *bytecode = f->f_code->co_code;
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unsigned char *code = (unsigned char *)PyBytes_AS_STRING(bytecode);
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if (code[f->f_lasti + 1] != YIELD_FROM)
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return NULL;
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yf = f->f_stacktop[-1];
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Py_INCREF(yf);
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}
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return yf;
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}
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static PyObject *
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gen_close(PyGenObject *gen, PyObject *args)
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{
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PyObject *retval;
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PyObject *yf = _PyGen_yf(gen);
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int err = 0;
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if (yf) {
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gen->gi_running = 1;
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err = gen_close_iter(yf);
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gen->gi_running = 0;
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Py_DECREF(yf);
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}
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if (err == 0)
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PyErr_SetNone(PyExc_GeneratorExit);
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retval = gen_send_ex(gen, Py_None, 1, 1);
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if (retval) {
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char *msg = "generator ignored GeneratorExit";
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if (PyCoro_CheckExact(gen))
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msg = "coroutine ignored GeneratorExit";
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Py_DECREF(retval);
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PyErr_SetString(PyExc_RuntimeError, msg);
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return NULL;
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}
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if (PyErr_ExceptionMatches(PyExc_StopIteration)
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|| PyErr_ExceptionMatches(PyExc_GeneratorExit)) {
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PyErr_Clear(); /* ignore these errors */
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Py_INCREF(Py_None);
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return Py_None;
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}
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return NULL;
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}
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PyDoc_STRVAR(throw_doc,
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"throw(typ[,val[,tb]]) -> raise exception in generator,\n\
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return next yielded value or raise StopIteration.");
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static PyObject *
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gen_throw(PyGenObject *gen, PyObject *args)
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{
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PyObject *typ;
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PyObject *tb = NULL;
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PyObject *val = NULL;
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PyObject *yf = _PyGen_yf(gen);
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_Py_IDENTIFIER(throw);
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if (!PyArg_UnpackTuple(args, "throw", 1, 3, &typ, &val, &tb))
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return NULL;
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if (yf) {
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PyObject *ret;
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int err;
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if (PyErr_GivenExceptionMatches(typ, PyExc_GeneratorExit)) {
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gen->gi_running = 1;
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err = gen_close_iter(yf);
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gen->gi_running = 0;
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Py_DECREF(yf);
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if (err < 0)
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return gen_send_ex(gen, Py_None, 1, 0);
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goto throw_here;
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}
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if (PyGen_CheckExact(yf)) {
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gen->gi_running = 1;
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ret = gen_throw((PyGenObject *)yf, args);
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gen->gi_running = 0;
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} else {
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PyObject *meth = _PyObject_GetAttrId(yf, &PyId_throw);
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if (meth == NULL) {
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if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
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Py_DECREF(yf);
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return NULL;
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}
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PyErr_Clear();
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Py_DECREF(yf);
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goto throw_here;
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}
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gen->gi_running = 1;
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ret = PyObject_CallObject(meth, args);
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gen->gi_running = 0;
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Py_DECREF(meth);
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}
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Py_DECREF(yf);
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if (!ret) {
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PyObject *val;
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/* Pop subiterator from stack */
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ret = *(--gen->gi_frame->f_stacktop);
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assert(ret == yf);
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Py_DECREF(ret);
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/* Termination repetition of YIELD_FROM */
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gen->gi_frame->f_lasti++;
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if (_PyGen_FetchStopIterationValue(&val) == 0) {
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ret = gen_send_ex(gen, val, 0, 0);
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Py_DECREF(val);
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} else {
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ret = gen_send_ex(gen, Py_None, 1, 0);
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}
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}
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return ret;
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}
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throw_here:
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/* First, check the traceback argument, replacing None with
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NULL. */
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if (tb == Py_None) {
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tb = NULL;
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}
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else if (tb != NULL && !PyTraceBack_Check(tb)) {
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PyErr_SetString(PyExc_TypeError,
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"throw() third argument must be a traceback object");
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return NULL;
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}
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Py_INCREF(typ);
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Py_XINCREF(val);
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Py_XINCREF(tb);
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if (PyExceptionClass_Check(typ))
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PyErr_NormalizeException(&typ, &val, &tb);
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else if (PyExceptionInstance_Check(typ)) {
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/* Raising an instance. The value should be a dummy. */
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if (val && val != Py_None) {
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PyErr_SetString(PyExc_TypeError,
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"instance exception may not have a separate value");
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goto failed_throw;
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}
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else {
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/* Normalize to raise <class>, <instance> */
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Py_XDECREF(val);
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val = typ;
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typ = PyExceptionInstance_Class(typ);
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Py_INCREF(typ);
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if (tb == NULL)
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/* Returns NULL if there's no traceback */
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tb = PyException_GetTraceback(val);
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}
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}
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else {
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/* Not something you can raise. throw() fails. */
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PyErr_Format(PyExc_TypeError,
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"exceptions must be classes or instances "
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"deriving from BaseException, not %s",
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Py_TYPE(typ)->tp_name);
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goto failed_throw;
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}
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PyErr_Restore(typ, val, tb);
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return gen_send_ex(gen, Py_None, 1, 0);
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failed_throw:
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/* Didn't use our arguments, so restore their original refcounts */
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Py_DECREF(typ);
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Py_XDECREF(val);
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Py_XDECREF(tb);
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return NULL;
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}
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static PyObject *
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gen_iternext(PyGenObject *gen)
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{
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return gen_send_ex(gen, NULL, 0, 0);
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}
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/*
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* If StopIteration exception is set, fetches its 'value'
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* attribute if any, otherwise sets pvalue to None.
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*
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* Returns 0 if no exception or StopIteration is set.
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* If any other exception is set, returns -1 and leaves
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* pvalue unchanged.
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*/
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int
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_PyGen_FetchStopIterationValue(PyObject **pvalue) {
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PyObject *et, *ev, *tb;
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PyObject *value = NULL;
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if (PyErr_ExceptionMatches(PyExc_StopIteration)) {
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PyErr_Fetch(&et, &ev, &tb);
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if (ev) {
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/* exception will usually be normalised already */
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if (PyObject_TypeCheck(ev, (PyTypeObject *) et)) {
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value = ((PyStopIterationObject *)ev)->value;
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Py_INCREF(value);
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Py_DECREF(ev);
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} else if (et == PyExc_StopIteration) {
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/* avoid normalisation and take ev as value */
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value = ev;
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} else {
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/* normalisation required */
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PyErr_NormalizeException(&et, &ev, &tb);
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if (!PyObject_TypeCheck(ev, (PyTypeObject *)PyExc_StopIteration)) {
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PyErr_Restore(et, ev, tb);
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return -1;
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}
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value = ((PyStopIterationObject *)ev)->value;
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Py_INCREF(value);
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Py_DECREF(ev);
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}
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}
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Py_XDECREF(et);
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Py_XDECREF(tb);
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} else if (PyErr_Occurred()) {
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return -1;
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}
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if (value == NULL) {
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value = Py_None;
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Py_INCREF(value);
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}
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*pvalue = value;
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return 0;
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}
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static PyObject *
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gen_repr(PyGenObject *gen)
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{
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return PyUnicode_FromFormat("<generator object %S at %p>",
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gen->gi_qualname, gen);
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}
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static PyObject *
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gen_get_name(PyGenObject *op)
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{
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Py_INCREF(op->gi_name);
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return op->gi_name;
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}
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static int
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gen_set_name(PyGenObject *op, PyObject *value)
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{
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PyObject *tmp;
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|
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/* Not legal to del gen.gi_name or to set it to anything
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* other than a string object. */
|
|
if (value == NULL || !PyUnicode_Check(value)) {
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PyErr_SetString(PyExc_TypeError,
|
|
"__name__ must be set to a string object");
|
|
return -1;
|
|
}
|
|
tmp = op->gi_name;
|
|
Py_INCREF(value);
|
|
op->gi_name = value;
|
|
Py_DECREF(tmp);
|
|
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)
|
|
{
|
|
PyObject *tmp;
|
|
|
|
/* 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;
|
|
}
|
|
tmp = op->gi_qualname;
|
|
Py_INCREF(value);
|
|
op->gi_qualname = value;
|
|
Py_DECREF(tmp);
|
|
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("<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)
|
|
{
|
|
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 */
|
|
PyObject_Del, /* tp_free */
|
|
};
|
|
|
|
PyObject *
|
|
PyCoro_New(PyFrameObject *f, PyObject *name, PyObject *qualname)
|
|
{
|
|
return gen_new_with_qualname(&PyCoro_Type, f, name, qualname);
|
|
}
|