[PATCH 1/9] qom: add trace events for object/property lifecycle

["Daniel P. Berrangé" <berrange@redhat.com>]

This adds tracing around object allocation & finalization, the addition &
deletion of properties, and the addition & deletion of children.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 qom/object.c     | 34 +++++++++++++++++++++++++++-------
 qom/trace-events | 12 ++++++++++--
 2 files changed, 37 insertions(+), 9 deletions(-)

diff --git a/qom/object.c b/qom/object.c
index f981e27044..b99da7309d 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -603,6 +603,8 @@ static void object_property_del_all(Object *obj)
         object_property_iter_init(&iter, obj);
         while ((prop = object_property_iter_next(&iter)) != NULL) {
             if (g_hash_table_add(done, prop)) {
+                trace_object_property_del(obj, obj->class->type->name,
+                                          prop->name, prop->opaque);
                 if (prop->release) {
                     prop->release(obj, prop->name, prop->opaque);
                     released = true;
@@ -621,10 +623,14 @@ static void object_property_del_child(Object *obj, Object *child)
     GHashTableIter iter;
     gpointer key, value;
 
+    trace_object_property_del_child(obj, obj->class->type->name,
+                                    child, child->class->type->name);
     g_hash_table_iter_init(&iter, obj->properties);
     while (g_hash_table_iter_next(&iter, &key, &value)) {
         prop = value;
         if (object_property_is_child(prop) && prop->opaque == child) {
+            trace_object_property_del(obj, obj->class->type->name,
+                                      prop->name, prop->opaque);
             if (prop->release) {
                 prop->release(obj, prop->name, prop->opaque);
                 prop->release = NULL;
@@ -664,7 +670,7 @@ static void object_finalize(void *data)
 {
     Object *obj = data;
     TypeImpl *ti = obj->class->type;
-
+    trace_object_finalize(obj, obj->class->type->name);
     object_property_del_all(obj);
     object_deinit(obj, ti);
 
@@ -714,6 +720,7 @@ static Object *object_new_with_type(Type type)
     object_initialize_with_type(obj, size, type);
     obj->free = obj_free;
 
+    trace_object_new(obj, obj ? obj->class->type->name : "(null)");
     return obj;
 }
 
@@ -844,8 +851,9 @@ Object *object_dynamic_cast(Object *obj, const char *typename)
 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
                                    const char *file, int line, const char *func)
 {
-    trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
-                                     typename, file, line, func);
+    trace_object_dynamic_cast_assert(
+        obj, obj ? obj->class->type->name : "(null)",
+        typename, file, line, func);
 
 #ifdef CONFIG_QOM_CAST_DEBUG
     int i;
@@ -935,8 +943,9 @@ ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 {
     ObjectClass *ret;
 
-    trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
-                                           typename, file, line, func);
+    trace_object_class_dynamic_cast_assert(
+        class ? class->type->name : "(null)",
+        typename, file, line, func);
 
 #ifdef CONFIG_QOM_CAST_DEBUG
     int i;
@@ -1220,6 +1229,8 @@ object_property_try_add(Object *obj, const char *name, const char *type,
     prop->release = release;
     prop->opaque = opaque;
 
+    trace_object_property_add(obj, obj->class->type->name,
+                              prop->name, prop->opaque);
     g_hash_table_insert(obj->properties, prop->name, prop);
     return prop;
 }
@@ -1258,6 +1269,8 @@ object_class_property_add(ObjectClass *klass,
     prop->release = release;
     prop->opaque = opaque;
 
+    trace_object_class_property_add(klass->type->name, prop->name,
+                                    prop->opaque);
     g_hash_table_insert(klass->properties, prop->name, prop);
 
     return prop;
@@ -1346,6 +1359,8 @@ void object_property_del(Object *obj, const char *name)
 {
     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
 
+    trace_object_property_del(obj, obj->class->type->name, prop->name,
+                              prop->opaque);
     if (prop->release) {
         prop->release(obj, name, prop->opaque);
     }
@@ -1634,8 +1649,11 @@ int object_property_get_enum(Object *obj, const char *name,
 bool object_property_parse(Object *obj, const char *name,
                            const char *string, Error **errp)
 {
-    Visitor *v = string_input_visitor_new(string);
-    bool ok = object_property_set(obj, name, v, errp);
+    Visitor *v;
+    bool ok;
+    trace_object_property_parse(obj, obj->class->type->name, name, string);
+    v = string_input_visitor_new(string);
+    ok = object_property_set(obj, name, v, errp);
 
     visit_free(v);
     return ok;
@@ -1766,6 +1784,8 @@ object_property_try_add_child(Object *obj, const char *name,
     g_autofree char *type = NULL;
     ObjectProperty *op;
 
+    trace_object_property_add_child(obj, obj->class->type->name, name,
+                                    child, child->class->type->name);
     assert(!child->parent);
 
     type = g_strdup_printf("child<%s>", object_get_typename(child));
diff --git a/qom/trace-events b/qom/trace-events
index b2e9f4a712..9aabbae4f7 100644
--- a/qom/trace-events
+++ b/qom/trace-events
@@ -1,5 +1,13 @@
 # See docs/devel/tracing.rst for syntax documentation.
 
 # object.c
-object_dynamic_cast_assert(const char *type, const char *target, const char *file, int line, const char *func) "%s->%s (%s:%d:%s)"
-object_class_dynamic_cast_assert(const char *type, const char *target, const char *file, int line, const char *func) "%s->%s (%s:%d:%s)"
+object_dynamic_cast_assert(void *obj, const char *type, const char *target, const char *file, int line, const char *func) "obj=%p type=%s->%s (%s:%d:%s)"
+object_finalize(void *obj, const char *type) "obj=%p type=%s"
+object_new(void *obj, const char *type) "obj=%p type=%s"
+object_property_add(void *obj, const char *type, const char *name, void *value) "obj=%p type=%s name=%s value=%p"
+object_property_add_child(void *obj, const char *type, const char *name, void *parent, const char *parenttype) "obj=%p type=%s name=%s parent=%p parent-type=%s"
+object_property_del(void *obj, const char *type, const char *name, void *value) "obj=%p type=%s name=%s value=%p"
+object_property_del_child(void *obj, const char *type, void *parent, const char *parenttype) "obj=%p type=%s parent=%p parent-type=%s"
+object_property_parse(void *obj, const char *type, const char *name, const char *value) "obj=%p type=%s prop=%s value=%s"
+object_class_dynamic_cast_assert(const char *type, const char *target, const char *file, int line, const char *func) "type=%s->%s (%s:%d:%s)"
+object_class_property_add(const char *type, const char *name, void *value) "type=%s name=%s value=%p"
-- 
2.54.0