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gh-122245: move checks for writes and shadowing of __debug__ to symtable (#122246)

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Irit Katriel 2024-07-26 14:39:56 +01:00 • committed by GitHub
parent 2c42e13e80
commit bc94cf7e25
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5 changed files with 173 additions and 83 deletions
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92
Python/symtable.c
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@ -1495,8 +1495,57 @@ error:
}
static int
symtable_add_def(struct symtable *st, PyObject *name, int flag, _Py_SourceLocation loc)
check_name(struct symtable *st, PyObject *name, _Py_SourceLocation loc,
expr_context_ty ctx)
{
if (ctx == Store && _PyUnicode_EqualToASCIIString(name, "__debug__")) {
PyErr_SetString(PyExc_SyntaxError, "cannot assign to __debug__");
SET_ERROR_LOCATION(st->st_filename, loc);
return 0;
}
if (ctx == Del && _PyUnicode_EqualToASCIIString(name, "__debug__")) {
PyErr_SetString(PyExc_SyntaxError, "cannot delete __debug__");
SET_ERROR_LOCATION(st->st_filename, loc);
return 0;
}
return 1;
}
static int
check_keywords(struct symtable *st, asdl_keyword_seq *keywords)
{
for (Py_ssize_t i = 0; i < asdl_seq_LEN(keywords); i++) {
keyword_ty key = ((keyword_ty)asdl_seq_GET(keywords, i));
if (key->arg && !check_name(st, key->arg, LOCATION(key), Store)) {
return 0;
}
}
return 1;
}
static int
check_kwd_patterns(struct symtable *st, pattern_ty p)
{
assert(p->kind == MatchClass_kind);
asdl_identifier_seq *kwd_attrs = p->v.MatchClass.kwd_attrs;
asdl_pattern_seq *kwd_patterns = p->v.MatchClass.kwd_patterns;
for (Py_ssize_t i = 0; i < asdl_seq_LEN(kwd_attrs); i++) {
_Py_SourceLocation loc = LOCATION(asdl_seq_GET(kwd_patterns, i));
if (!check_name(st, asdl_seq_GET(kwd_attrs, i), loc, Store)) {
return 0;
}
}
return 1;
}
static int
symtable_add_def_ctx(struct symtable *st, PyObject *name, int flag,
_Py_SourceLocation loc, expr_context_ty ctx)
{
int write_mask = DEF_PARAM | DEF_LOCAL | DEF_IMPORT;
if ((flag & write_mask) && !check_name(st, name, loc, ctx)) {
return 0;
}
if ((flag & DEF_TYPE_PARAM) && st->st_cur->ste_mangled_names != NULL) {
if(PySet_Add(st->st_cur->ste_mangled_names, name) < 0) {
return 0;
@ -1505,6 +1554,14 @@ symtable_add_def(struct symtable *st, PyObject *name, int flag, _Py_SourceLocati
return symtable_add_def_helper(st, name, flag, st->st_cur, loc);
}
static int
symtable_add_def(struct symtable *st, PyObject *name, int flag,
_Py_SourceLocation loc)
{
return symtable_add_def_ctx(st, name, flag, loc,
flag == USE ? Load : Store);
}
static int
symtable_enter_type_param_block(struct symtable *st, identifier name,
void *ast, int has_defaults, int has_kwdefaults,
@ -1757,6 +1814,9 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
VISIT_SEQ(st, type_param, s->v.ClassDef.type_params);
}
VISIT_SEQ(st, expr, s->v.ClassDef.bases);
if (!check_keywords(st, s->v.ClassDef.keywords)) {
VISIT_QUIT(st, 0);
}
VISIT_SEQ(st, keyword, s->v.ClassDef.keywords);
if (!symtable_enter_block(st, s->v.ClassDef.name, ClassBlock,
(void *)s, LOCATION(s))) {
@ -1871,10 +1931,11 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
VISIT(st, expr, s->v.AnnAssign.value);
}
break;
case AugAssign_kind:
case AugAssign_kind: {
VISIT(st, expr, s->v.AugAssign.target);
VISIT(st, expr, s->v.AugAssign.value);
break;
}
case For_kind:
VISIT(st, expr, s->v.For.target);
VISIT(st, expr, s->v.For.iter);
@ -2311,6 +2372,9 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
case Call_kind:
VISIT(st, expr, e->v.Call.func);
VISIT_SEQ(st, expr, e->v.Call.args);
if (!check_keywords(st, e->v.Call.keywords)) {
VISIT_QUIT(st, 0);
}
VISIT_SEQ_WITH_NULL(st, keyword, e->v.Call.keywords);
break;
case FormattedValue_kind:
@ -2326,6 +2390,9 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
break;
/* The following exprs can be assignment targets. */
case Attribute_kind:
if (!check_name(st, e->v.Attribute.attr, LOCATION(e), e->v.Attribute.ctx)) {
VISIT_QUIT(st, 0);
}
VISIT(st, expr, e->v.Attribute.value);
break;
case Subscript_kind:
@ -2344,9 +2411,11 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
VISIT(st, expr, e->v.Slice.step);
break;
case Name_kind:
if (!symtable_add_def(st, e->v.Name.id,
e->v.Name.ctx == Load ? USE : DEF_LOCAL, LOCATION(e)))
if (!symtable_add_def_ctx(st, e->v.Name.id,
e->v.Name.ctx == Load ? USE : DEF_LOCAL,
LOCATION(e), e->v.Name.ctx)) {
VISIT_QUIT(st, 0);
}
/* Special-case super: it counts as a use of __class__ */
if (e->v.Name.ctx == Load &&
_PyST_IsFunctionLike(st->st_cur) &&
@ -2472,19 +2541,26 @@ symtable_visit_pattern(struct symtable *st, pattern_ty p)
break;
case MatchStar_kind:
if (p->v.MatchStar.name) {
symtable_add_def(st, p->v.MatchStar.name, DEF_LOCAL, LOCATION(p));
if (!symtable_add_def(st, p->v.MatchStar.name, DEF_LOCAL, LOCATION(p))) {
VISIT_QUIT(st, 0);
}
}
break;
case MatchMapping_kind:
VISIT_SEQ(st, expr, p->v.MatchMapping.keys);
VISIT_SEQ(st, pattern, p->v.MatchMapping.patterns);
if (p->v.MatchMapping.rest) {
symtable_add_def(st, p->v.MatchMapping.rest, DEF_LOCAL, LOCATION(p));
if (!symtable_add_def(st, p->v.MatchMapping.rest, DEF_LOCAL, LOCATION(p))) {
VISIT_QUIT(st, 0);
}
}
break;
case MatchClass_kind:
VISIT(st, expr, p->v.MatchClass.cls);
VISIT_SEQ(st, pattern, p->v.MatchClass.patterns);
if (!check_kwd_patterns(st, p)) {
VISIT_QUIT(st, 0);
}
VISIT_SEQ(st, pattern, p->v.MatchClass.kwd_patterns);
break;
case MatchAs_kind:
@ -2492,7 +2568,9 @@ symtable_visit_pattern(struct symtable *st, pattern_ty p)
VISIT(st, pattern, p->v.MatchAs.pattern);
}
if (p->v.MatchAs.name) {
symtable_add_def(st, p->v.MatchAs.name, DEF_LOCAL, LOCATION(p));
if (!symtable_add_def(st, p->v.MatchAs.name, DEF_LOCAL, LOCATION(p))) {
VISIT_QUIT(st, 0);
}
}
break;
case MatchOr_kind: