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bpo-41218: Only mark async code with CO_COROUTINE. (GH-21357) 

3.8.3 had a regression where compiling with
ast.PyCF_ALLOW_TOP_LEVEL_AWAIT woudl agressively mark things are
coroutine even if there were not.
(cherry picked from commit bd46174a5a)

Co-authored-by: Matthias Bussonnier <bussonniermatthias@gmail.com>
This commit is contained in:
Miss Islington (bot) 2020-07-06 14:44:16 -07:00 committed by GitHub
parent aa7f775614
commit 41db8ffc59
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 29 additions and 4 deletions
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19
Lib/test/test_builtin.py
View File

@ -370,6 +370,25 @@ class BuiltinTest(unittest.TestCase):
rv = ns['f']()
self.assertEqual(rv, tuple(expected))
def test_compile_top_level_await_no_coro(self):
"""Make sure top level non-await codes get the correct coroutine flags.
"""
modes = ('single', 'exec')
code_samples = [
'''def f():pass\n''',
'''[x for x in l]'''
]
for mode, code_sample in product(modes, code_samples):
source = dedent(code_sample)
co = compile(source,
'?',
mode,
flags=ast.PyCF_ALLOW_TOP_LEVEL_AWAIT)
self.assertNotEqual(co.co_flags & CO_COROUTINE, CO_COROUTINE,
msg=f"source={source} mode={mode}")
def test_compile_top_level_await(self):
"""Test whether code some top level await can be compiled.

4
Misc/NEWS.d/next/Core and Builtins/2020-07-06-13-35-17.bpo-41218.oKnSr2.rst Normal file
View File

@ -0,0 +1,4 @@
Python 3.8.3 had a regression where compiling with
ast.PyCF_ALLOW_TOP_LEVEL_AWAIT would aggressively mark list comprehension
with CO_COROUTINE. Now only list comprehension making use of async/await
will tagged as so.

10
Python/compile.c
View File

@ -4470,10 +4470,9 @@ compiler_comprehension(struct compiler *c, expr_ty e, int type,
comprehension_ty outermost;
PyObject *qualname = NULL;
int is_async_generator = 0;
int top_level_await = IS_TOP_LEVEL_AWAIT(c);
if (IS_TOP_LEVEL_AWAIT(c)) {
c->u->u_ste->ste_coroutine = 1;
}
int is_async_function = c->u->u_ste->ste_coroutine;
outermost = (comprehension_ty) asdl_seq_GET(generators, 0);
@ -4485,7 +4484,7 @@ compiler_comprehension(struct compiler *c, expr_ty e, int type,
is_async_generator = c->u->u_ste->ste_coroutine;
if (is_async_generator && !is_async_function && type != COMP_GENEXP) {
if (is_async_generator && !is_async_function && type != COMP_GENEXP && !top_level_await) {
compiler_error(c, "asynchronous comprehension outside of "
"an asynchronous function");
goto error_in_scope;
@ -4524,6 +4523,9 @@ compiler_comprehension(struct compiler *c, expr_ty e, int type,
qualname = c->u->u_qualname;
Py_INCREF(qualname);
compiler_exit_scope(c);
if (top_level_await && is_async_generator){
c->u->u_ste->ste_coroutine = 1;
}
if (co == NULL)
goto error;