#include <stddef.h> /* for offsetof */
+#if defined __cplusplus
+# include <type_traits> /* for std::remove_cv */
+#endif
+
#define caa_likely(x) __builtin_expect(!!(x), 1)
#define caa_unlikely(x) __builtin_expect(!!(x), 0)
(type *)((char *)__ptr - offsetof(type, member)); \
})
+/*
+ * caa_container_of_check_null - Get the address of an object containing a field.
+ *
+ * @ptr: pointer to the field.
+ * @type: type of the object.
+ * @member: name of the field within the object.
+ *
+ * Return the address of the object containing the field. Return NULL if
+ * @ptr is NULL.
+ */
+#define caa_container_of_check_null(ptr, type, member) \
+ __extension__ \
+ ({ \
+ const __typeof__(((type *) NULL)->member) * __ptr = (ptr); \
+ (__ptr) ? (type *)((char *)__ptr - offsetof(type, member)) : NULL; \
+ })
+
#define CAA_BUILD_BUG_ON_ZERO(cond) (sizeof(struct { int:-!!(cond); }))
#define CAA_BUILD_BUG_ON(cond) ((void)CAA_BUILD_BUG_ON_ZERO(cond))
#define __rcu
#ifdef __cplusplus
-#define URCU_FORCE_CAST(type, arg) (reinterpret_cast<type>(arg))
+#define URCU_FORCE_CAST(_type, arg) (reinterpret_cast<std::remove_cv<_type>::type>(arg))
#else
#define URCU_FORCE_CAST(type, arg) ((type) (arg))
#endif
#define CAA_ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-#ifdef __GNUC__
+/*
+ * URCU_GCC_VERSION is used to blacklist specific GCC versions with known
+ * bugs, clang also defines these macros to an equivalent GCC version it
+ * claims to support, so exclude it.
+ */
+#if defined(__GNUC__) && !defined(__clang__)
# define URCU_GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
#endif
+#ifdef __cplusplus
+#define caa_unqual_scalar_typeof(x) \
+ std::remove_cv<std::remove_reference<decltype(x)>::type>::type
+#else
+#define caa_scalar_type_to_expr(type) \
+ unsigned type: (unsigned type)0, \
+ signed type: (signed type)0
+
+/*
+ * Use C11 _Generic to express unqualified type from expression. This removes
+ * volatile qualifier from expression type.
+ */
+#define caa_unqual_scalar_typeof(x) \
+ __typeof__( \
+ _Generic((x), \
+ char: (char)0, \
+ caa_scalar_type_to_expr(char), \
+ caa_scalar_type_to_expr(short), \
+ caa_scalar_type_to_expr(int), \
+ caa_scalar_type_to_expr(long), \
+ caa_scalar_type_to_expr(long long), \
+ default: (x) \
+ ) \
+ )
+#endif
+
#endif /* _URCU_COMPILER_H */