From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luc Van Oostenryck Subject: [PATCH v4 5/6] check the storage of C99 for-loop initializers Date: Sun, 5 Mar 2017 20:21:51 +0100 Message-ID: <20170305192152.67931-6-luc.vanoostenryck@gmail.com> References: <20170305192152.67931-1-luc.vanoostenryck@gmail.com> Return-path: Received: from mail-wm0-f67.google.com ([74.125.82.67]:36526 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752392AbdCETWl (ORCPT ); Sun, 5 Mar 2017 14:22:41 -0500 Received: by mail-wm0-f67.google.com with SMTP id v190so10657041wme.3 for ; Sun, 05 Mar 2017 11:22:04 -0800 (PST) In-Reply-To: <20170305192152.67931-1-luc.vanoostenryck@gmail.com> Sender: linux-sparse-owner@vger.kernel.org List-Id: linux-sparse@vger.kernel.org To: linux-sparse@vger.kernel.org Cc: Christopher Li , Luc Van Oostenryck In C99, it is valid to declare a variable inside a for-loop initializer but only when the storage is local (automatic or register). Until now this was not enforced. Fix this, when parsing declarations in a for-loop context, by calling external_decl() with a validate method doing the appropriate check of the storage. Signed-off-by: Luc Van Oostenryck --- parse.c | 13 ++++++++++++- validation/c99-for-loop-decl.c | 1 - 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/parse.c b/parse.c index d91a4bced..6ec1bab97 100644 --- a/parse.c +++ b/parse.c @@ -2229,6 +2229,17 @@ static struct token *parse_return_statement(struct token *token, struct statemen return expression_statement(token->next, &stmt->ret_value); } +static void validate_for_loop_decl(struct symbol *sym) +{ + unsigned long storage = sym->ctype.modifiers & MOD_STORAGE; + + if (storage & ~(MOD_AUTO | MOD_REGISTER)) { + const char *name = show_ident(sym->ident); + sparse_error(sym->pos, "non-local var '%s' in for-loop initializer", name); + sym->ctype.modifiers &= ~MOD_STORAGE; + } +} + static struct token *parse_for_statement(struct token *token, struct statement *stmt) { struct symbol_list *syms; @@ -2242,7 +2253,7 @@ static struct token *parse_for_statement(struct token *token, struct statement * e1 = NULL; /* C99 variable declaration? */ if (lookup_type(token)) { - token = external_declaration(token, &syms, NULL); + token = external_declaration(token, &syms, validate_for_loop_decl); } else { token = parse_expression(token, &e1); token = expect(token, ';', "in 'for'"); diff --git a/validation/c99-for-loop-decl.c b/validation/c99-for-loop-decl.c index b9db8c9c6..e813b0ae3 100644 --- a/validation/c99-for-loop-decl.c +++ b/validation/c99-for-loop-decl.c @@ -30,7 +30,6 @@ static int c99(void) /* * check-name: C99 for-loop declarations - * check-known-to-fail * * check-error-start c99-for-loop-decl.c:22:27: warning: symbol with external linkage has initializer -- 2.11.1