Cast debugging can have a substantial cost (20% or more). Instead of adding
special-cased "fast casts" in the hot paths, we can just disable it in
releases. The tracing facilities we just added make it easier to analyze
those problems that cast debugging would reveal.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id:
1368188203-3407-7-git-send-email-pbonzini@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
pkgversion=""
pie=""
zero_malloc=""
+qom_cast_debug="yes"
trace_backend="nop"
trace_file="trace"
spice=""
;;
--enable-sdl) sdl="yes"
;;
+ --disable-qom-cast-debug) qom_cast_debug="no"
+ ;;
+ --enable-qom-cast-debug) qom_cast_debug="yes"
+ ;;
--disable-virtfs) virtfs="no"
;;
--enable-virtfs) virtfs="yes"
echo "TPM support $tpm"
echo "libssh2 support $libssh2"
echo "TPM passthrough $tpm_passthrough"
+echo "QOM debugging $qom_cast_debug"
if test "$sdl_too_old" = "yes"; then
echo "-> Your SDL version is too old - please upgrade to have SDL support"
if test "$zero_malloc" = "yes" ; then
echo "CONFIG_ZERO_MALLOC=y" >> $config_host_mak
fi
+if test "$qom_cast_debug" = "yes" ; then
+ echo "CONFIG_QOM_CAST_DEBUG=y" >> $config_host_mak
+fi
if test "$rbd" = "yes" ; then
echo "CONFIG_RBD=y" >> $config_host_mak
fi
*
* See object_dynamic_cast() for a description of the parameters of this
* function. The only difference in behavior is that this function asserts
- * instead of returning #NULL on failure. This function is not meant to be
- * called directly, but only through the wrapper macro OBJECT_CHECK.
+ * instead of returning #NULL on failure if QOM cast debugging is enabled.
+ * This function is not meant to be called directly, but only through
+ * the wrapper macro OBJECT_CHECK.
*/
Object *object_dynamic_cast_assert(Object *obj, const char *typename,
const char *file, int line, const char *func);
*
* See object_class_dynamic_cast() for a description of the parameters
* of this function. The only difference in behavior is that this function
- * asserts instead of returning #NULL on failure. This function is not
- * meant to be called directly, but only through the wrapper macros
- * OBJECT_CLASS_CHECK and INTERFACE_CHECK.
+ * asserts instead of returning #NULL on failure if QOM cast debugging is
+ * enabled. This function is not meant to be called directly, but only through
+ * the wrapper macros OBJECT_CLASS_CHECK and INTERFACE_CHECK.
*/
ObjectClass *object_class_dynamic_cast_assert(ObjectClass *klass,
const char *typename,
Object *object_dynamic_cast_assert(Object *obj, const char *typename,
const char *file, int line, const char *func)
{
- Object *inst;
-
trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
typename, file, line, func);
- inst = object_dynamic_cast(obj, typename);
+#ifdef CONFIG_QOM_CAST_DEBUG
+ Object *inst = object_dynamic_cast(obj, typename);
if (!inst && obj) {
fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
abort();
}
- return inst;
+ assert(obj == inst);
+#endif
+ return obj;
}
ObjectClass *object_class_dynamic_cast(ObjectClass *class,
trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
typename, file, line, func);
+#ifndef CONFIG_QOM_CAST_DEBUG
+ if (!class->interfaces) {
+ return class;
+ }
+#endif
+
ret = object_class_dynamic_cast(class, typename);
if (!ret && class) {
fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",