You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
2.1 KiB
61 lines
2.1 KiB
From b86fec9baa9c2ee03b28cfc8dad95c41bf9acaad Mon Sep 17 00:00:00 2001 |
|
From: Flavio Leitner <fbl@redhat.com> |
|
Date: Wed, 2 Oct 2013 02:40:09 -0300 |
|
Subject: [PATCH] util: use gcc builtins to better check array sizes |
|
|
|
GCC provides two useful builtin functions that can help |
|
to improve array size checking during compilation. |
|
|
|
This patch contains no functional changes, but it makes |
|
it easier to detect mistakes. |
|
|
|
Signed-off-by: Flavio Leitner <fbl@redhat.com> |
|
Signed-off-by: Ben Pfaff <blp@nicira.com> |
|
--- |
|
AUTHORS | 1 + |
|
lib/util.h | 17 ++++++++++++++++- |
|
2 files changed, 17 insertions(+), 1 deletion(-) |
|
|
|
diff --git a/AUTHORS b/AUTHORS |
|
index af34bfe..7a919a2 100644 |
|
--- a/AUTHORS |
|
+++ b/AUTHORS |
|
@@ -32,6 +32,7 @@ Duffie Cooley dcooley@nicira.com |
|
Ed Maste emaste at freebsd.org |
|
Edward Tomasz Napierała trasz@freebsd.org |
|
Ethan Jackson ethan@nicira.com |
|
+Flavio Leitner fbl@redhat.com |
|
FUJITA Tomonori fujita.tomonori@lab.ntt.co.jp |
|
Gaetano Catalli gaetano.catalli@gmail.com |
|
Giuseppe Lettieri g.lettieri@iet.unipi.it |
|
diff --git a/lib/util.h b/lib/util.h |
|
index 0db41be..a899065 100644 |
|
--- a/lib/util.h |
|
+++ b/lib/util.h |
|
@@ -87,8 +87,23 @@ void ovs_assert_failure(const char *, const char *, const char *) NO_RETURN; |
|
|
|
extern const char *program_name; |
|
|
|
+#define __ARRAY_SIZE_NOCHECK(ARRAY) (sizeof(ARRAY) / sizeof((ARRAY)[0])) |
|
+#ifdef __GNUC__ |
|
+/* return 0 for array types, 1 otherwise */ |
|
+#define __ARRAY_CHECK(ARRAY) \ |
|
+ !__builtin_types_compatible_p(typeof(ARRAY), typeof(&ARRAY[0])) |
|
+ |
|
+/* compile-time fail if not array */ |
|
+#define __ARRAY_FAIL(ARRAY) (sizeof(char[-2*!__ARRAY_CHECK(ARRAY)])) |
|
+#define __ARRAY_SIZE(ARRAY) \ |
|
+ __builtin_choose_expr(__ARRAY_CHECK(ARRAY), \ |
|
+ __ARRAY_SIZE_NOCHECK(ARRAY), __ARRAY_FAIL(ARRAY)) |
|
+#else |
|
+#define __ARRAY_SIZE(ARRAY) __ARRAY_SIZE_NOCHECK(ARRAY) |
|
+#endif |
|
+ |
|
/* Returns the number of elements in ARRAY. */ |
|
-#define ARRAY_SIZE(ARRAY) (sizeof ARRAY / sizeof *ARRAY) |
|
+#define ARRAY_SIZE(ARRAY) __ARRAY_SIZE(ARRAY) |
|
|
|
/* Returns X / Y, rounding up. X must be nonnegative to round correctly. */ |
|
#define DIV_ROUND_UP(X, Y) (((X) + ((Y) - 1)) / (Y)) |
|
-- |
|
1.8.4.2
|
|
|