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Issue #28003: Implement PEP 525 -- Asynchronous Generators.

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This commit is contained in:
Yury Selivanov 2016-09-08 22:01:51 -07:00
parent b96ef55d49
commit eb6364557f
27 changed files with 2189 additions and 96 deletions
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114
Python/ceval.c
View file

@ -1204,7 +1204,7 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
f->f_stacktop = NULL; /* remains NULL unless yield suspends frame */
f->f_executing = 1;
if (co->co_flags & (CO_GENERATOR | CO_COROUTINE)) {
if (co->co_flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR)) {
if (!throwflag && f->f_exc_type != NULL && f->f_exc_type != Py_None) {
/* We were in an except handler when we left,
restore the exception state which was put aside
@ -2083,36 +2083,45 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
PyObject *aiter = TOP();
PyTypeObject *type = Py_TYPE(aiter);
if (type->tp_as_async != NULL)
getter = type->tp_as_async->am_anext;
if (getter != NULL) {
next_iter = (*getter)(aiter);
if (next_iter == NULL) {
if (PyAsyncGen_CheckExact(aiter)) {
awaitable = type->tp_as_async->am_anext(aiter);
if (awaitable == NULL) {
goto error;
}
}
else {
PyErr_Format(
PyExc_TypeError,
"'async for' requires an iterator with "
"__anext__ method, got %.100s",
type->tp_name);
goto error;
}
} else {
if (type->tp_as_async != NULL){
getter = type->tp_as_async->am_anext;
}
awaitable = _PyCoro_GetAwaitableIter(next_iter);
if (awaitable == NULL) {
PyErr_Format(
PyExc_TypeError,
"'async for' received an invalid object "
"from __anext__: %.100s",
Py_TYPE(next_iter)->tp_name);
if (getter != NULL) {
next_iter = (*getter)(aiter);
if (next_iter == NULL) {
goto error;
}
}
else {
PyErr_Format(
PyExc_TypeError,
"'async for' requires an iterator with "
"__anext__ method, got %.100s",
type->tp_name);
goto error;
}
Py_DECREF(next_iter);
goto error;
} else
Py_DECREF(next_iter);
awaitable = _PyCoro_GetAwaitableIter(next_iter);
if (awaitable == NULL) {
PyErr_Format(
PyExc_TypeError,
"'async for' received an invalid object "
"from __anext__: %.100s",
Py_TYPE(next_iter)->tp_name);
Py_DECREF(next_iter);
goto error;
} else {
Py_DECREF(next_iter);
}
}
PUSH(awaitable);
PREDICT(LOAD_CONST);
@ -2187,6 +2196,17 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
TARGET(YIELD_VALUE) {
retval = POP();
if (co->co_flags & CO_ASYNC_GENERATOR) {
PyObject *w = _PyAsyncGenValueWrapperNew(retval);
Py_DECREF(retval);
if (w == NULL) {
retval = NULL;
goto error;
}
retval = w;
}
f->f_stacktop = stack_pointer;
why = WHY_YIELD;
goto fast_yield;
@ -3712,7 +3732,7 @@ fast_block_end:
assert((retval != NULL) ^ (PyErr_Occurred() != NULL));
fast_yield:
if (co->co_flags & (CO_GENERATOR | CO_COROUTINE)) {
if (co->co_flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR)) {
/* The purpose of this block is to put aside the generator's exception
state and restore that of the calling frame. If the current
@ -4156,8 +4176,8 @@ _PyEval_EvalCodeWithName(PyObject *_co, PyObject *globals, PyObject *locals,
freevars[PyTuple_GET_SIZE(co->co_cellvars) + i] = o;
}
/* Handle generator/coroutine */
if (co->co_flags & (CO_GENERATOR | CO_COROUTINE)) {
/* Handle generator/coroutine/asynchronous generator */
if (co->co_flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR)) {
PyObject *gen;
PyObject *coro_wrapper = tstate->coroutine_wrapper;
int is_coro = co->co_flags & CO_COROUTINE;
@ -4182,6 +4202,8 @@ _PyEval_EvalCodeWithName(PyObject *_co, PyObject *globals, PyObject *locals,
* and return that as the value. */
if (is_coro) {
gen = PyCoro_New(f, name, qualname);
} else if (co->co_flags & CO_ASYNC_GENERATOR) {
gen = PyAsyncGen_New(f, name, qualname);
} else {
gen = PyGen_NewWithQualName(f, name, qualname);
}
@ -4660,6 +4682,38 @@ _PyEval_GetCoroutineWrapper(void)
return tstate->coroutine_wrapper;
}
void
_PyEval_SetAsyncGenFirstiter(PyObject *firstiter)
{
PyThreadState *tstate = PyThreadState_GET();
Py_XINCREF(firstiter);
Py_XSETREF(tstate->async_gen_firstiter, firstiter);
}
PyObject *
_PyEval_GetAsyncGenFirstiter(void)
{
PyThreadState *tstate = PyThreadState_GET();
return tstate->async_gen_firstiter;
}
void
_PyEval_SetAsyncGenFinalizer(PyObject *finalizer)
{
PyThreadState *tstate = PyThreadState_GET();
Py_XINCREF(finalizer);
Py_XSETREF(tstate->async_gen_finalizer, finalizer);
}
PyObject *
_PyEval_GetAsyncGenFinalizer(void)
{
PyThreadState *tstate = PyThreadState_GET();
return tstate->async_gen_finalizer;
}
PyObject *
PyEval_GetBuiltins(void)
{

13
Python/compile.c
View file

@ -1886,8 +1886,6 @@ compiler_function(struct compiler *c, stmt_ty s, int is_async)
return 0;
}
if (is_async)
co->co_flags |= CO_COROUTINE;
compiler_make_closure(c, co, funcflags, qualname);
Py_DECREF(qualname);
Py_DECREF(co);
@ -2801,6 +2799,9 @@ compiler_visit_stmt(struct compiler *c, stmt_ty s)
if (c->u->u_ste->ste_type != FunctionBlock)
return compiler_error(c, "'return' outside function");
if (s->v.Return.value) {
if (c->u->u_ste->ste_coroutine && c->u->u_ste->ste_generator)
return compiler_error(
c, "'return' with value in async generator");
VISIT(c, expr, s->v.Return.value);
}
else
@ -4115,8 +4116,6 @@ compiler_visit_expr(struct compiler *c, expr_ty e)
case Yield_kind:
if (c->u->u_ste->ste_type != FunctionBlock)
return compiler_error(c, "'yield' outside function");
if (c->u->u_scope_type == COMPILER_SCOPE_ASYNC_FUNCTION)
return compiler_error(c, "'yield' inside async function");
if (e->v.Yield.value) {
VISIT(c, expr, e->v.Yield.value);
}
@ -4992,8 +4991,12 @@ compute_code_flags(struct compiler *c)
flags |= CO_NEWLOCALS | CO_OPTIMIZED;
if (ste->ste_nested)
flags |= CO_NESTED;
if (ste->ste_generator)
if (ste->ste_generator && !ste->ste_coroutine)
flags |= CO_GENERATOR;
if (!ste->ste_generator && ste->ste_coroutine)
flags |= CO_COROUTINE;
if (ste->ste_generator && ste->ste_coroutine)
flags |= CO_ASYNC_GENERATOR;
if (ste->ste_varargs)
flags |= CO_VARARGS;
if (ste->ste_varkeywords)

1
Python/pylifecycle.c
View file

@ -694,6 +694,7 @@ Py_FinalizeEx(void)
_PyGC_Fini();
_PyRandom_Fini();
_PyArg_Fini();
PyAsyncGen_Fini();
/* Cleanup Unicode implementation */
_PyUnicode_Fini();

5
Python/pystate.c
View file

@ -229,6 +229,9 @@ new_threadstate(PyInterpreterState *interp, int init)
tstate->in_coroutine_wrapper = 0;
tstate->co_extra_user_count = 0;
tstate->async_gen_firstiter = NULL;
tstate->async_gen_finalizer = NULL;
if (init)
_PyThreadState_Init(tstate);
@ -408,6 +411,8 @@ PyThreadState_Clear(PyThreadState *tstate)
Py_CLEAR(tstate->c_traceobj);
Py_CLEAR(tstate->coroutine_wrapper);
Py_CLEAR(tstate->async_gen_firstiter);
Py_CLEAR(tstate->async_gen_finalizer);
}

6
Python/symtable.c
View file

@ -63,6 +63,7 @@ ste_new(struct symtable *st, identifier name, _Py_block_ty block,
ste->ste_nested = 1;
ste->ste_child_free = 0;
ste->ste_generator = 0;
ste->ste_coroutine = 0;
ste->ste_returns_value = 0;
ste->ste_needs_class_closure = 0;
@ -378,7 +379,7 @@ error_at_directive(PySTEntryObject *ste, PyObject *name)
PyLong_AsLong(PyTuple_GET_ITEM(data, 2)));
return 0;
}
}
}
PyErr_SetString(PyExc_RuntimeError,
"BUG: internal directive bookkeeping broken");
@ -1397,6 +1398,7 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
FunctionBlock, (void *)s, s->lineno,
s->col_offset))
VISIT_QUIT(st, 0);
st->st_cur->ste_coroutine = 1;
VISIT(st, arguments, s->v.AsyncFunctionDef.args);
VISIT_SEQ(st, stmt, s->v.AsyncFunctionDef.body);
if (!symtable_exit_block(st, s))
@ -1492,7 +1494,7 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
break;
case Await_kind:
VISIT(st, expr, e->v.Await.value);
st->st_cur->ste_generator = 1;
st->st_cur->ste_coroutine = 1;
break;
case Compare_kind:
VISIT(st, expr, e->v.Compare.left);

119
Python/sysmodule.c
View file

@ -717,6 +717,113 @@ Return the wrapper for coroutine objects set by sys.set_coroutine_wrapper."
);
static PyTypeObject AsyncGenHooksType;
PyDoc_STRVAR(asyncgen_hooks_doc,
"asyncgen_hooks\n\
\n\
A struct sequence providing information about asynhronous\n\
generators hooks. The attributes are read only.");
static PyStructSequence_Field asyncgen_hooks_fields[] = {
{"firstiter", "Hook to intercept first iteration"},
{"finalizer", "Hook to intercept finalization"},
{0}
};
static PyStructSequence_Desc asyncgen_hooks_desc = {
"asyncgen_hooks", /* name */
asyncgen_hooks_doc, /* doc */
asyncgen_hooks_fields , /* fields */
2
};
static PyObject *
sys_set_asyncgen_hooks(PyObject *self, PyObject *args, PyObject *kw)
{
static char *keywords[] = {"firstiter", "finalizer", NULL};
PyObject *firstiter = NULL;
PyObject *finalizer = NULL;
if (!PyArg_ParseTupleAndKeywords(
args, kw, "|OO", keywords,
&firstiter, &finalizer)) {
return NULL;
}
if (finalizer && finalizer != Py_None) {
if (!PyCallable_Check(finalizer)) {
PyErr_Format(PyExc_TypeError,
"callable finalizer expected, got %.50s",
Py_TYPE(finalizer)->tp_name);
return NULL;
}
_PyEval_SetAsyncGenFinalizer(finalizer);
}
else if (finalizer == Py_None) {
_PyEval_SetAsyncGenFinalizer(NULL);
}
if (firstiter && firstiter != Py_None) {
if (!PyCallable_Check(firstiter)) {
PyErr_Format(PyExc_TypeError,
"callable firstiter expected, got %.50s",
Py_TYPE(firstiter)->tp_name);
return NULL;
}
_PyEval_SetAsyncGenFirstiter(firstiter);
}
else if (firstiter == Py_None) {
_PyEval_SetAsyncGenFirstiter(NULL);
}
Py_RETURN_NONE;
}
PyDoc_STRVAR(set_asyncgen_hooks_doc,
"set_asyncgen_hooks(*, firstiter=None, finalizer=None)\n\
\n\
Set a finalizer for async generators objects."
);
static PyObject *
sys_get_asyncgen_hooks(PyObject *self, PyObject *args)
{
PyObject *res;
PyObject *firstiter = _PyEval_GetAsyncGenFirstiter();
PyObject *finalizer = _PyEval_GetAsyncGenFinalizer();
res = PyStructSequence_New(&AsyncGenHooksType);
if (res == NULL) {
return NULL;
}
if (firstiter == NULL) {
firstiter = Py_None;
}
if (finalizer == NULL) {
finalizer = Py_None;
}
Py_INCREF(firstiter);
PyStructSequence_SET_ITEM(res, 0, firstiter);
Py_INCREF(finalizer);
PyStructSequence_SET_ITEM(res, 1, finalizer);
return res;
}
PyDoc_STRVAR(get_asyncgen_hooks_doc,
"get_asyncgen_hooks()\n\
\n\
Return a namedtuple of installed asynchronous generators hooks \
(firstiter, finalizer)."
);
static PyTypeObject Hash_InfoType;
PyDoc_STRVAR(hash_info_doc,
@ -1315,6 +1422,10 @@ static PyMethodDef sys_methods[] = {
set_coroutine_wrapper_doc},
{"get_coroutine_wrapper", sys_get_coroutine_wrapper, METH_NOARGS,
get_coroutine_wrapper_doc},
{"set_asyncgen_hooks", sys_set_asyncgen_hooks,
METH_VARARGS | METH_KEYWORDS, set_asyncgen_hooks_doc},
{"get_asyncgen_hooks", sys_get_asyncgen_hooks, METH_NOARGS,
get_asyncgen_hooks_doc},
{NULL, NULL} /* sentinel */
};
@ -1950,6 +2061,14 @@ _PySys_Init(void)
SET_SYS_FROM_STRING("thread_info", PyThread_GetInfo());
#endif
/* initialize asyncgen_hooks */
if (AsyncGenHooksType.tp_name == NULL) {
if (PyStructSequence_InitType2(
&AsyncGenHooksType, &asyncgen_hooks_desc) < 0) {
return NULL;
}
}
#undef SET_SYS_FROM_STRING
#undef SET_SYS_FROM_STRING_BORROW
if (PyErr_Occurred())