From 15be8b4bf01a4f01b2afcea82bd042f3a98b9ac1 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Mon, 28 Nov 2011 18:13:43 -0700 Subject: [PATCH] mesa: add STATIC_ASSERT() macro for compile-time assertions This can be used to check that tables have the right number of entries, etc. at compile-time. This will hopefully catch things that are missed if particular drivers aren't tested, for example. v2: Simplify the macro to omit the extra line number info (the compiler already indicates the line number). And wrap the macro for readability. --- src/mesa/main/compiler.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/src/mesa/main/compiler.h b/src/mesa/main/compiler.h index 921e3022288..25d9810538a 100644 --- a/src/mesa/main/compiler.h +++ b/src/mesa/main/compiler.h @@ -310,6 +310,18 @@ static INLINE GLuint CPU_TO_LE32(GLuint x) #endif #endif + +/** + * Static (compile-time) assertion. + * Basically, use COND to dimension an array. If COND is false/zero the + * array size will be -1 and we'll get a compilation error. + */ +#define STATIC_ASSERT(COND) \ + do { \ + typedef int static_assertion_failed[(!!(COND))*2-1]; \ + } while (0) + + #if (__GNUC__ >= 3) #define PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a))) #else -- 2.30.2