diff options
Diffstat (limited to 'qapi')
-rw-r--r-- | qapi/qmp-output-visitor.c | 89 |
1 files changed, 26 insertions, 63 deletions
diff --git a/qapi/qmp-output-visitor.c b/qapi/qmp-output-visitor.c index 4500e3bc49..f47eefa626 100644 --- a/qapi/qmp-output-visitor.c +++ b/qapi/qmp-output-visitor.c @@ -31,16 +31,8 @@ typedef QTAILQ_HEAD(QStack, QStackEntry) QStack; struct QmpOutputVisitor { Visitor visitor; - /* FIXME: we are abusing stack to hold two separate pieces of - * information: the current root object in slot 0, and the stack - * of N objects still being built in slots 1 through N (for N+1 - * slots in use). Worse, our behavior is inconsistent: - * qmp_output_add_obj() visiting two top-level scalars in a row - * discards the first in favor of the second, but visiting two - * top-level objects in a row tries to append the second object - * into the first (since the first object was placed in the stack - * in both slot 0 and 1, but only popped from slot 1). */ - QStack stack; + QStack stack; /* Stack of containers that haven't yet been finished */ + QObject *root; /* Root of the output visit */ }; #define qmp_output_add(qov, name, value) \ @@ -57,6 +49,7 @@ static void qmp_output_push_obj(QmpOutputVisitor *qov, QObject *value) { QStackEntry *e = g_malloc0(sizeof(*e)); + assert(qov->root); assert(value); e->value = value; if (qobject_type(e->value) == QTYPE_QLIST) { @@ -79,60 +72,32 @@ static QObject *qmp_output_pop(QmpOutputVisitor *qov) return value; } -/* Grab the root QObject, if any */ -static QObject *qmp_output_first(QmpOutputVisitor *qov) -{ - QStackEntry *e = QTAILQ_LAST(&qov->stack, QStack); - - if (!e) { - /* No root */ - return NULL; - } - assert(e->value); - return e->value; -} - -/* Peek at the top of the stack of QObjects being built. - * The stack must not be empty. */ -static QObject *qmp_output_last(QmpOutputVisitor *qov) -{ - QStackEntry *e = QTAILQ_FIRST(&qov->stack); - - assert(e && e->value); - return e->value; -} - /* Add @value to the current QObject being built. * If the stack is visiting a dictionary or list, @value is now owned * by that container. Otherwise, @value is now the root. */ static void qmp_output_add_obj(QmpOutputVisitor *qov, const char *name, QObject *value) { - QObject *cur; - - if (QTAILQ_EMPTY(&qov->stack)) { - /* Stack was empty, track this object as root */ - qmp_output_push_obj(qov, value); - return; - } + QStackEntry *e = QTAILQ_FIRST(&qov->stack); + QObject *cur = e ? e->value : NULL; - cur = qmp_output_last(qov); - - switch (qobject_type(cur)) { - case QTYPE_QDICT: - assert(name); - qdict_put_obj(qobject_to_qdict(cur), name, value); - break; - case QTYPE_QLIST: - qlist_append_obj(qobject_to_qlist(cur), value); - break; - default: - /* The previous root was a scalar, replace it with a new root */ - /* FIXME this is abusing the stack; see comment above */ - qobject_decref(qmp_output_pop(qov)); - assert(QTAILQ_EMPTY(&qov->stack)); - qmp_output_push_obj(qov, value); - break; + if (!cur) { + /* FIXME we should require the user to reset the visitor, rather + * than throwing away the previous root */ + qobject_decref(qov->root); + qov->root = value; + } else { + switch (qobject_type(cur)) { + case QTYPE_QDICT: + assert(name); + qdict_put_obj(qobject_to_qdict(cur), name, value); + break; + case QTYPE_QLIST: + qlist_append_obj(qobject_to_qlist(cur), value); + break; + default: + g_assert_not_reached(); + } } } @@ -233,7 +198,9 @@ static void qmp_output_type_any(Visitor *v, const char *name, QObject **obj, /* Finish building, and return the root object. Will not be NULL. */ QObject *qmp_output_get_qobject(QmpOutputVisitor *qov) { - QObject *obj = qmp_output_first(qov); + /* FIXME: we should require that a visit occurred, and that it is + * complete (no starts without a matching end) */ + QObject *obj = qov->root; if (obj) { qobject_incref(obj); } else { @@ -251,16 +218,12 @@ void qmp_output_visitor_cleanup(QmpOutputVisitor *v) { QStackEntry *e, *tmp; - /* The bottom QStackEntry, if any, owns the root QObject. See the - * qmp_output_push_obj() invocations in qmp_output_add_obj(). */ - QObject *root = QTAILQ_EMPTY(&v->stack) ? NULL : qmp_output_first(v); - QTAILQ_FOREACH_SAFE(e, &v->stack, node, tmp) { QTAILQ_REMOVE(&v->stack, e, node); g_free(e); } - qobject_decref(root); + qobject_decref(v->root); g_free(v); } |