diff options
Diffstat (limited to 'dbus/dbus-internals.h')
| -rw-r--r-- | dbus/dbus-internals.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/dbus/dbus-internals.h b/dbus/dbus-internals.h index 0284da0e..675a3a73 100644 --- a/dbus/dbus-internals.h +++ b/dbus/dbus-internals.h @@ -51,6 +51,33 @@ void _dbus_verbose_reset_real (void); #define _DBUS_FUNCTION_NAME "unknown function" #endif +/* + * (code from GLib) + * + * The _DBUS_LIKELY and _DBUS_UNLIKELY macros let the programmer give hints to + * the compiler about the expected result of an expression. Some compilers + * can use this information for optimizations. + * + * The _DBUS_BOOLEAN_EXPR macro is intended to trigger a gcc warning when + * putting assignments in the macro arg + */ +#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__) +#define _DBUS_BOOLEAN_EXPR(expr) \ + __extension__ ({ \ + int _dbus_boolean_var_; \ + if (expr) \ + _dbus_boolean_var_ = 1; \ + else \ + _dbus_boolean_var_ = 0; \ + _dbus_boolean_var_; \ +}) +#define _DBUS_LIKELY(expr) (__builtin_expect (_DBUS_BOOLEAN_EXPR(expr), 1)) +#define _DBUS_UNLIKELY(expr) (__builtin_expect (_DBUS_BOOLEAN_EXPR(expr), 0)) +#else +#define _DBUS_LIKELY(expr) (expr) +#define _DBUS_UNLIKELY(expr) (expr) +#endif + #ifdef DBUS_ENABLE_VERBOSE_MODE # define _dbus_verbose _dbus_verbose_real # define _dbus_verbose_reset _dbus_verbose_reset_real |