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Add conditional support for noreturn functions.

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This adds support for tagging functions with the noreturn attribute.
If DO_CRASH is enabled then ast_do_crash never returns.  If AST_DEVMODE
and DO_CRASH are enabled then failed assertions never return.  This can
resolve a large number of false positives with static analyzers.

ASTERISK-26220 #close

Change-Id: Icfb61e5fe54574eced4c3e88b317244f467ec753
This commit is contained in:
Corey Farrell
2016-07-18 23:46:19 -04:00
parent 5f24874ebb
commit 7fdf7c3d4c
6 changed files with 92 additions and 9 deletions
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3
include/asterisk/autoconfig.h.in
View File

@@ -103,6 +103,9 @@
/* Define to 1 if your GCC C compiler supports the 'may_alias' attribute. */
#undef HAVE_ATTRIBUTE_may_alias
/* Define to 1 if your GCC C compiler supports the 'noreturn' attribute. */
#undef HAVE_ATTRIBUTE_noreturn
/* Define to 1 if your GCC C compiler supports the 'pure' attribute. */
#undef HAVE_ATTRIBUTE_pure

6
include/asterisk/compiler.h
View File

@@ -77,6 +77,12 @@
#define attribute_may_alias
#endif
#ifdef HAVE_ATTRIBUTE_noreturn
#define attribute_noreturn __attribute__((noreturn))
#else
#define attribute_noreturn
#endif
/* Some older version of GNU gcc (3.3.5 on OpenBSD 4.3 for example) dont like 'NULL' as sentinel */
#define SENTINEL ((char *)NULL)

9
include/asterisk/utils.h
View File

@@ -843,9 +843,14 @@ struct ast_http_digest {
*/
int ast_parse_digest(const char *digest, struct ast_http_digest *d, int request, int pedantic);
#ifdef DO_CRASH
#define DO_CRASH_NORETURN attribute_noreturn
#else
#define DO_CRASH_NORETURN
#endif
#ifdef AST_DEVMODE
void __ast_assert_failed(int condition, const char *condition_str, const char *file, int line, const char *function);
void DO_CRASH_NORETURN __ast_assert_failed(int condition, const char *condition_str, const char *file, int line, const char *function);
#define ast_assert(a) _ast_assert(a, # a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
static void force_inline _ast_assert(int condition, const char *condition_str, const char *file, int line, const char *function)
{
@@ -864,7 +869,7 @@ static void force_inline _ast_assert(int condition, const char *condition_str, c
*
* \return Nothing
*/
void ast_do_crash(void);
void DO_CRASH_NORETURN ast_do_crash(void);
#include "asterisk/strings.h"