From 7feaf0d910db343577e557694e2ad1c6188ba375 Mon Sep 17 00:00:00 2001
From: INADA Naoki <songofacandy@gmail.com>
Date: Wed, 25 Jan 2017 22:33:43 +0900
Subject: Issue #29369: Use Py_IDENTIFIER in Python-ast.c

---
 Parser/asdl_c.py    | 21 +++++++++++++--------
 Python/Python-ast.c | 18 ++++++++++++------
 2 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
index 725d73bad4..444cdea341 100644
--- a/Parser/asdl_c.py
+++ b/Parser/asdl_c.py
@@ -622,6 +622,9 @@ class PyTypesVisitor(PickleVisitor):
 
     def visitModule(self, mod):
         self.emit("""
+_Py_IDENTIFIER(_fields);
+_Py_IDENTIFIER(_attributes);
+
 typedef struct {
     PyObject_HEAD
     PyObject *dict;
@@ -650,7 +653,6 @@ ast_clear(AST_object *self)
 static int
 ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
 {
-    _Py_IDENTIFIER(_fields);
     Py_ssize_t i, numfields = 0;
     int res = -1;
     PyObject *key, *value, *fields;
@@ -775,6 +777,8 @@ static PyTypeObject AST_type = {
 
 static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int num_fields)
 {
+    _Py_IDENTIFIER(__module__);
+    _Py_IDENTIFIER(_ast);
     PyObject *fnames, *result;
     int i;
     fnames = PyTuple_New(num_fields);
@@ -787,8 +791,11 @@ static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int
         }
         PyTuple_SET_ITEM(fnames, i, field);
     }
-    result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){sOss}",
-                    type, base, "_fields", fnames, "__module__", "_ast");
+    result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){OOOO}",
+                    type, base,
+                    _PyUnicode_FromId(&PyId__fields), fnames,
+                    _PyUnicode_FromId(&PyId___module__),
+                    _PyUnicode_FromId(&PyId__ast));
     Py_DECREF(fnames);
     return (PyTypeObject*)result;
 }
@@ -796,7 +803,6 @@ static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int
 static int add_attributes(PyTypeObject* type, char**attrs, int num_fields)
 {
     int i, result;
-    _Py_IDENTIFIER(_attributes);
     PyObject *s, *l = PyTuple_New(num_fields);
     if (!l)
         return 0;
@@ -942,8 +948,8 @@ static int add_ast_fields(void)
     d = AST_type.tp_dict;
     empty_tuple = PyTuple_New(0);
     if (!empty_tuple ||
-        PyDict_SetItemString(d, "_fields", empty_tuple) < 0 ||
-        PyDict_SetItemString(d, "_attributes", empty_tuple) < 0) {
+        _PyDict_SetItemId(d, &PyId__fields, empty_tuple) < 0 ||
+        _PyDict_SetItemId(d, &PyId__attributes, empty_tuple) < 0) {
         Py_XDECREF(empty_tuple);
         return -1;
     }
@@ -1091,8 +1097,7 @@ class ObjVisitor(PickleVisitor):
         self.emit("%s o = (%s)_o;" % (ctype, ctype), 1)
         self.emit("PyObject *result = NULL, *value = NULL;", 1)
         self.emit('if (!o) {', 1)
-        self.emit("Py_INCREF(Py_None);", 2)
-        self.emit('return Py_None;', 2)
+        self.emit("Py_RETURN_NONE;", 2)
         self.emit("}", 1)
         self.emit('', 0)
 
diff --git a/Python/Python-ast.c b/Python/Python-ast.c
index a049641dc0..dcf24f0df3 100644
--- a/Python/Python-ast.c
+++ b/Python/Python-ast.c
@@ -504,6 +504,9 @@ static char *withitem_fields[]={
 };
 
 
+_Py_IDENTIFIER(_fields);
+_Py_IDENTIFIER(_attributes);
+
 typedef struct {
     PyObject_HEAD
     PyObject *dict;
@@ -532,7 +535,6 @@ ast_clear(AST_object *self)
 static int
 ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
 {
-    _Py_IDENTIFIER(_fields);
     Py_ssize_t i, numfields = 0;
     int res = -1;
     PyObject *key, *value, *fields;
@@ -657,6 +659,8 @@ static PyTypeObject AST_type = {
 
 static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int num_fields)
 {
+    _Py_IDENTIFIER(__module__);
+    _Py_IDENTIFIER(_ast);
     PyObject *fnames, *result;
     int i;
     fnames = PyTuple_New(num_fields);
@@ -669,8 +673,11 @@ static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int
         }
         PyTuple_SET_ITEM(fnames, i, field);
     }
-    result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){sOss}",
-                    type, base, "_fields", fnames, "__module__", "_ast");
+    result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){OOOO}",
+                    type, base,
+                    _PyUnicode_FromId(&PyId__fields), fnames,
+                    _PyUnicode_FromId(&PyId___module__),
+                    _PyUnicode_FromId(&PyId__ast));
     Py_DECREF(fnames);
     return (PyTypeObject*)result;
 }
@@ -678,7 +685,6 @@ static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int
 static int add_attributes(PyTypeObject* type, char**attrs, int num_fields)
 {
     int i, result;
-    _Py_IDENTIFIER(_attributes);
     PyObject *s, *l = PyTuple_New(num_fields);
     if (!l)
         return 0;
@@ -824,8 +830,8 @@ static int add_ast_fields(void)
     d = AST_type.tp_dict;
     empty_tuple = PyTuple_New(0);
     if (!empty_tuple ||
-        PyDict_SetItemString(d, "_fields", empty_tuple) < 0 ||
-        PyDict_SetItemString(d, "_attributes", empty_tuple) < 0) {
+        _PyDict_SetItemId(d, &PyId__fields, empty_tuple) < 0 ||
+        _PyDict_SetItemId(d, &PyId__attributes, empty_tuple) < 0) {
         Py_XDECREF(empty_tuple);
         return -1;
     }
-- 
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