use a invalid name for the __class__ closure for super() (closes #12370)
This prevents the assignment of __class__ in the class body from breaking
super. (Although a determined person could do locals()["@__class__"] = 4)
diff --git a/Python/compile.c b/Python/compile.c
index b655c25..567b230 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -1566,7 +1566,7 @@
return 0;
}
/* return the (empty) __class__ cell */
- str = PyUnicode_InternFromString("__class__");
+ str = PyUnicode_InternFromString("@__class__");
if (str == NULL) {
compiler_exit_scope(c);
return 0;
diff --git a/Python/symtable.c b/Python/symtable.c
index e31a2eb..b82d8d5 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -225,10 +225,17 @@
struct symtable *
PySymtable_Build(mod_ty mod, const char *filename, PyFutureFeatures *future)
{
- struct symtable *st = symtable_new();
+ struct symtable *st;
asdl_seq *seq;
int i;
+ if (__class__ == NULL) {
+ __class__ = PyUnicode_InternFromString("@__class__");
+ if (__class__ == NULL)
+ return NULL;
+ }
+
+ st = symtable_new();
if (st == NULL)
return st;
st->st_filename = filename;
@@ -744,8 +751,6 @@
}
else {
/* Special-case __class__ */
- if (!GET_IDENTIFIER(__class__))
- goto error;
assert(PySet_Contains(local, __class__) == 1);
if (PySet_Add(newbound, __class__) < 0)
goto error;
@@ -783,7 +788,7 @@
NULL))
goto error;
else if (ste->ste_type == ClassBlock && !analyze_cells(scopes, newfree,
- "__class__"))
+ "@__class__"))
goto error;
/* Records the results of the analysis in the symbol table entry */
if (!update_symbols(ste->ste_symbols, scopes, bound, newfree,
@@ -1143,8 +1148,7 @@
if (!symtable_enter_block(st, s->v.ClassDef.name, ClassBlock,
(void *)s, s->lineno, s->col_offset))
return 0;
- if (!GET_IDENTIFIER(__class__) ||
- !symtable_add_def(st, __class__, DEF_LOCAL) ||
+ if (!symtable_add_def(st, __class__, DEF_LOCAL) ||
!GET_IDENTIFIER(__locals__) ||
!symtable_add_def(st, __locals__, DEF_PARAM)) {
symtable_exit_block(st, s);
@@ -1417,8 +1421,7 @@
if (e->v.Name.ctx == Load &&
st->st_cur->ste_type == FunctionBlock &&
!PyUnicode_CompareWithASCIIString(e->v.Name.id, "super")) {
- if (!GET_IDENTIFIER(__class__) ||
- !symtable_add_def(st, __class__, USE))
+ if (!symtable_add_def(st, __class__, USE))
return 0;
}
break;