From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Wed, 23 Sep 2009 17:13:29 +0000 (-0400)
Subject: Add offsetof to compiler.h
X-Git-Tag: v0.1~46
X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=commitdiff_plain;h=3d7be7ca4e2451381a8fc8a00bd6d7dcbf3b678f

Add offsetof to compiler.h

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---

diff --git a/compiler.h b/compiler.h
index 142b9a6..99972f3 100644
--- a/compiler.h
+++ b/compiler.h
@@ -37,4 +37,14 @@
  */
 #define ACCESS_ONCE(x)	(*(volatile typeof(x) *)&x)
 
+#if (__GNUC__ == 4)
+#define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
+#endif
+
+#ifdef __compiler_offsetof
+#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
+#else
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
+
 #endif /* _COMPILER_H */
diff --git a/tests/api_gcc.h b/tests/api_gcc.h
index 1ad7345..963f842 100644
--- a/tests/api_gcc.h
+++ b/tests/api_gcc.h
@@ -282,12 +282,12 @@ cmpxchg(volatile long *ptr, long oldval, long newval)
 #include <pthread.h>
 #include <sched.h>
 #include <sys/param.h>
+#include <arch.h>
 /* #include "atomic.h" */
 
 /*
  * Compiler magic.
  */
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #define container_of(ptr, type, member) ({			\
 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})
@@ -634,7 +634,6 @@ static void smp_init(void)
 #define LIST_POISON1  ((void *) 0x00100100)
 #define LIST_POISON2  ((void *) 0x00200200)
 
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #define container_of(ptr, type, member) ({			\
 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})
diff --git a/tests/api_ppc.h b/tests/api_ppc.h
index 8a03faa..1d9c47e 100644
--- a/tests/api_ppc.h
+++ b/tests/api_ppc.h
@@ -653,7 +653,6 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
 /*
  * Compiler magic.
  */
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #define container_of(ptr, type, member) ({			\
 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})
@@ -1005,7 +1004,6 @@ static void smp_init(void)
 #define LIST_POISON1  ((void *) 0x00100100)
 #define LIST_POISON2  ((void *) 0x00200200)
 
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #define container_of(ptr, type, member) ({			\
 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})
diff --git a/tests/api_x86.h b/tests/api_x86.h
index f48fce9..d64eb8d 100644
--- a/tests/api_x86.h
+++ b/tests/api_x86.h
@@ -346,7 +346,6 @@ __asm__ __volatile__(LOCK_PREFIX "orl %0,%1" \
 /*
  * Compiler magic.
  */
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #define container_of(ptr, type, member) ({			\
 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})
@@ -693,7 +692,6 @@ static void smp_init(void)
 #define LIST_POISON1  ((void *) 0x00100100)
 #define LIST_POISON2  ((void *) 0x00200200)
 
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #define container_of(ptr, type, member) ({			\
 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})