[3.10] bpo-45822: Respect PEP 263's coding cookies in the parser even if flags are not provided (GH-29582) (GH-29586)

(cherry picked from commit da20d7401de97b425897d3069f71f77b039eb16f)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>

4 files changed, 25 insertions, 1 deletions

diff --git a/Lib/test/test_capi.py b/Lib/test/test_capi.py
index 6ed5ecd..974e3d0 100644
--- a/Lib/test/test_capi.py
+++ b/Lib/test/test_capi.py
@@ -1013,6 +1013,14 @@ class Test_ModuleStateAccess(unittest.TestCase):
                 with self.assertRaises(TypeError):
                     increment_count(1, 2, 3)
 
+    def test_Py_CompileString(self):
+        # Check that Py_CompileString respects the coding cookie
+        _compile = _testcapi.Py_CompileString
+        code = b"# -*- coding: latin1 -*-\nprint('\xc2\xa4')\n"
+        result = _compile(code)
+        expected = compile(code, "<string>", "exec")
+        self.assertEqual(result.co_consts, expected.co_consts)
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/Misc/NEWS.d/next/Core and Builtins/2021-11-16-19-41-04.bpo-45822.OT6ueS.rst b/Misc/NEWS.d/next/Core and Builtins/2021-11-16-19-41-04.bpo-45822.OT6ueS.rst
new file mode 100644
index 0000000..1ac7a8b
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2021-11-16-19-41-04.bpo-45822.OT6ueS.rst
@@ -0,0 +1,2 @@
+Fixed a bug in the parser that was causing it to not respect :pep:`263`
+coding cookies when no flags are provided. Patch by Pablo Galindo
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 5e59549..9f25b64 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -391,6 +391,19 @@ static PyTypeObject _HashInheritanceTester_Type = {
 };
 
 static PyObject*
+pycompilestring(PyObject* self, PyObject *obj) {
+    if (PyBytes_CheckExact(obj) == 0) {
+        PyErr_SetString(PyExc_ValueError, "Argument must be a bytes object");
+        return NULL;
+    }
+    const char *the_string = PyBytes_AsString(obj);
+    if (the_string == NULL) {
+        return NULL;
+    }
+    return Py_CompileString(the_string, "blech", Py_file_input);
+}
+
+static PyObject*
 test_lazy_hash_inheritance(PyObject* self, PyObject *Py_UNUSED(ignored))
 {
     PyTypeObject *type;
@@ -5826,6 +5839,7 @@ static PyMethodDef TestMethods[] = {
     {"return_null_without_error", return_null_without_error, METH_NOARGS},
     {"return_result_with_error", return_result_with_error, METH_NOARGS},
     {"getitem_with_error", getitem_with_error, METH_VARARGS},
+    {"Py_CompileString",     pycompilestring, METH_O},
     {"PyTime_FromSeconds", test_pytime_fromseconds,  METH_VARARGS},
     {"PyTime_FromSecondsObject", test_pytime_fromsecondsobject,  METH_VARARGS},
     {"PyTime_AsSecondsDouble", test_pytime_assecondsdouble, METH_VARARGS},
diff --git a/Parser/pegen.c b/Parser/pegen.c
index cfb4b8e..170d28b 100644
--- a/Parser/pegen.c
+++ b/Parser/pegen.c
@@ -1434,7 +1434,7 @@ _PyPegen_run_parser_from_string(const char *str, int start_rule, PyObject *filen
     int exec_input = start_rule == Py_file_input;
 
     struct tok_state *tok;
-    if (flags == NULL || flags->cf_flags & PyCF_IGNORE_COOKIE) {
+    if (flags != NULL && flags->cf_flags & PyCF_IGNORE_COOKIE) {
         tok = PyTokenizer_FromUTF8(str, exec_input);
     } else {
         tok = PyTokenizer_FromString(str, exec_input);