* [PATCH] xmalloc: Fix warnings with gcc analyzer
@ 2021-07-28 5:09 Siddhesh Poyarekar via Libc-alpha
2021-07-28 10:28 ` Florian Weimer via Libc-alpha
0 siblings, 1 reply; 2+ messages in thread
From: Siddhesh Poyarekar via Libc-alpha @ 2021-07-28 5:09 UTC (permalink / raw)
To: libc-alpha
Tell the compiler that xmalloc family of allocators always return
non-NULL.
---
include/programs/xmalloc.h | 12 ++++++++----
misc/sys/cdefs.h | 10 ++++++++++
2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/include/programs/xmalloc.h b/include/programs/xmalloc.h
index 33871e22ef..574fb41254 100644
--- a/include/programs/xmalloc.h
+++ b/include/programs/xmalloc.h
@@ -23,11 +23,15 @@
/* Prototypes for a few program-wide used functions. */
extern void *xmalloc (size_t n)
- __attribute_malloc__ __attribute_alloc_size__ ((1)) __attr_dealloc_free;
+ __attribute_malloc__ __attribute_alloc_size__ ((1)) __attr_dealloc_free
+ __returns_nonnull;
extern void *xcalloc (size_t n, size_t s)
- __attribute_malloc__ __attribute_alloc_size__ ((1, 2)) __attr_dealloc_free;
+ __attribute_malloc__ __attribute_alloc_size__ ((1, 2)) __attr_dealloc_free
+ __returns_nonnull;
extern void *xrealloc (void *o, size_t n)
- __attribute_malloc__ __attribute_alloc_size__ ((2)) __attr_dealloc_free;
-extern char *xstrdup (const char *) __attribute_malloc__ __attr_dealloc_free;
+ __attribute_malloc__ __attribute_alloc_size__ ((2)) __attr_dealloc_free
+ __returns_nonnull;
+extern char *xstrdup (const char *) __attribute_malloc__ __attr_dealloc_free
+ __returns_nonnull;
#endif /* xmalloc.h */
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 30a621ab8f..d3203c73df 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -330,6 +330,16 @@
# define __nonnull(params) _GL_ATTRIBUTE_NONNULL (params)
#endif
+/* The returns_nonnull function attribute marks the return type of the function
+ as always being non-null. */
+#ifndef __returns_nonnull
+# if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__returns_nonnull__)
+# define __returns_nonnull __attribute__ ((returns_nonnull))
+# else
+# define __returns_nonnull
+# endif
+#endif
+
/* If fortification mode, we warn about unused results of certain
function calls which can lead to problems. */
#if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__)
--
2.31.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] xmalloc: Fix warnings with gcc analyzer
2021-07-28 5:09 [PATCH] xmalloc: Fix warnings with gcc analyzer Siddhesh Poyarekar via Libc-alpha
@ 2021-07-28 10:28 ` Florian Weimer via Libc-alpha
0 siblings, 0 replies; 2+ messages in thread
From: Florian Weimer via Libc-alpha @ 2021-07-28 10:28 UTC (permalink / raw)
To: Siddhesh Poyarekar via Libc-alpha; +Cc: Siddhesh Poyarekar
* Siddhesh Poyarekar via Libc-alpha:
> diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
> index 30a621ab8f..d3203c73df 100644
> --- a/misc/sys/cdefs.h
> +++ b/misc/sys/cdefs.h
> @@ -330,6 +330,16 @@
> # define __nonnull(params) _GL_ATTRIBUTE_NONNULL (params)
> #endif
>
> +/* The returns_nonnull function attribute marks the return type of the function
> + as always being non-null. */
> +#ifndef __returns_nonnull
> +# if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__returns_nonnull__)
> +# define __returns_nonnull __attribute__ ((returns_nonnull))
> +# else
> +# define __returns_nonnull
> +# endif
> +#endif
This needs to use __returns_nonnull__ in the attribute argument.
Thanks,
Florian
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-07-28 10:28 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-28 5:09 [PATCH] xmalloc: Fix warnings with gcc analyzer Siddhesh Poyarekar via Libc-alpha
2021-07-28 10:28 ` Florian Weimer via Libc-alpha
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).