[Qemu-devel] 答复： [PATCH v4 5/5] object: Add 'help' option for all available backends and properties

["Lin Ma" <lma@suse.com>]

ping...

>>> Lin Ma <lma@suse.com> 2016/10/20 星期四 下午 7:28 >>>
'-object help' prints available user creatable backends.
'-object $typename,help' prints relevant properties.

Signed-off-by: Lin Ma <lma@suse.com>
---
include/qom/object_interfaces.h |  2 ++
qemu-options.hx				 |  7 +++++-
qom/object_interfaces.c		 | 55 +++++++++++++++++++++++++++++++++++++++++
vl.c						    |  5 ++++
4 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/include/qom/object_interfaces.h b/include/qom/object_interfaces.h
index 8b17f4d..197cd5f 100644
--- a/include/qom/object_interfaces.h
+++ b/include/qom/object_interfaces.h
@@ -165,4 +165,6 @@ int user_creatable_add_opts_foreach(void *opaque,
  */
void user_creatable_del(const char *id, Error **errp);

+int user_creatable_help_func(void *opaque, QemuOpts *opts, Error **errp);
+
#endif
diff --git a/qemu-options.hx b/qemu-options.hx
index b1fbdb0..b9573ce 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3761,7 +3761,9 @@ DEF("object", HAS_ARG, QEMU_OPTION_object,
	 "			    create a new object of type TYPENAME setting properties\n"
	 "			    in the order they are specified.  Note that the 'id'\n"
	 "			    property must be set.  These objects are placed in the\n"
-    " 			   '/objects' path.\n",
+    " 			   '/objects' path.\n"
+    " 			   Use '-object help' to print available backend types and\n"
+    " 			   '-object typename,help' to print relevant properties.\n",
	 QEMU_ARCH_ALL)
STEXI
@item -object @var{typename}[,@var{prop1}=@var{value1},...]
@@ -3771,6 +3773,9 @@ in the order they are specified.  Note that the 'id'
property must be set.  These objects are placed in the
'/objects' path.

+Use @code{-object help} to print available backend types and
+@code{-object @var{typename},help} to print relevant properties.
+
@table @option

@item -object memory-backend-file,id=@var{id},size=@var{size},mem-path=@var{dir},share=@var{on|off}
diff --git a/qom/object_interfaces.c b/qom/object_interfaces.c
index bf59846..da8be39 100644
--- a/qom/object_interfaces.c
+++ b/qom/object_interfaces.c
@@ -5,6 +5,7 @@
#include "qapi-visit.h"
#include "qapi/qmp-output-visitor.h"
#include "qapi/opts-visitor.h"
+#include "qemu/help_option.h"

void user_creatable_complete(Object *obj, Error **errp)
{
@@ -212,6 +213,60 @@ void user_creatable_del(const char *id, Error **errp)
	 object_unparent(obj);
}

+int user_creatable_help_func(void *opaque, QemuOpts *opts, Error **errp)
+{
+    const char *type = NULL;
+    Object *obj = NULL;
+    ObjectClass *klass;
+    ObjectProperty *prop;
+    ObjectPropertyIterator iter;
+
+    type = qemu_opt_get(opts, "qom-type");
+    if (type && is_help_option(type)) {
+	    GSList *list;
+	    printf("Available object backend types:\n");
+	    for (list = object_class_get_list(TYPE_USER_CREATABLE, false);  \
+			    list; 												  \
+			    list = list->next) {
+		    const char *name;
+		    name = object_class_get_name(OBJECT_CLASS(list->data));
+		    if (strcmp(name, TYPE_USER_CREATABLE)) {
+			    printf("%s\n", name);
+		    }
+	    }
+	    g_slist_free(list);
+	    goto out;
+    }
+
+    if (!type || !qemu_opt_has_help_opt(opts)) {
+	    return 0;
+    }
+
+    klass = object_class_by_name(type);
+    if (!klass) {
+	    printf("invalid object type: %s\n", type);
+	    goto out;
+    }
+    if (object_class_is_abstract(klass)) {
+	    printf("object type '%s' is abstract\n", type);
+	    goto out;
+    }
+    obj = object_new(type);
+    object_property_iter_init(&iter, obj);
+
+    while ((prop = object_property_iter_next(&iter))) {
+	    if (prop->description) {
+		    printf("%s (%s, %s)\n", prop->name, prop->type, prop->description);
+	    } else {
+		    printf("%s (%s)\n", prop->name, prop->type);
+	    }
+    }
+
+out:
+    object_unref(obj);
+    return 1;
+}
+
static void register_types(void)
{
	 static const TypeInfo uc_interface_info = {
diff --git a/vl.c b/vl.c
index ebd47af..145
6eca 100644
--- a/vl.c
+++ b/vl.c
@@ -4100,6 +4100,11 @@ int main(int argc, char **argv, char **envp)
		 exit(0);
	 }

+    if (qemu_opts_foreach(qemu_find_opts("object"), user_creatable_help_func,
+						  NULL, NULL)) {
+	    exit(1);
+    }
+
	 if (!trace_init_backends()) {
		 exit(1);
	 }
-- 
2.9.2