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qmp: Tighten output visitor rules
Tighten assertions in the QMP output visitor, so that: - qmp_output_get_qobject() can only be called after pairing a visit_end_* for every visit_start_* (rather than allowing it on a partially built object) - qmp_output_get_qobject() cannot be called unless at least one visit_type_* or visit_start/visit_end pair has occurred since creation/reset (the accidental return of NULL fixed by commitab8bf1d7
would have been much easier to diagnose) - ensure that we are encountering the expected object or list type, to provide protection against mismatched push(struct)/ pop(list) or push(list)/pop(struct), similar to the qmp-input protection added in commitbdd8e6b5
. - ensure that except for the root, 'name' is non-null inside a dict, and NULL inside a list (this may need changing later if we add "name.0" support for better error messages for a list, but for now it makes sure all users are at least consistent) Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1461879932-9020-19-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
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@ -82,9 +82,8 @@ static void qmp_output_add_obj(QmpOutputVisitor *qov, const char *name,
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QObject *cur = e ? e->value : NULL;
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if (!cur) {
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/* FIXME we should require the user to reset the visitor, rather
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* than throwing away the previous root */
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qobject_decref(qov->root);
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/* Don't allow reuse of visitor on more than one root */
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assert(!qov->root);
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qov->root = value;
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} else {
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switch (qobject_type(cur)) {
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@ -93,6 +92,7 @@ static void qmp_output_add_obj(QmpOutputVisitor *qov, const char *name,
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qdict_put_obj(qobject_to_qdict(cur), name, value);
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break;
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case QTYPE_QLIST:
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assert(!name);
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qlist_append_obj(qobject_to_qlist(cur), value);
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break;
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default:
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@ -114,7 +114,8 @@ static void qmp_output_start_struct(Visitor *v, const char *name, void **obj,
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static void qmp_output_end_struct(Visitor *v, Error **errp)
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{
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QmpOutputVisitor *qov = to_qov(v);
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qmp_output_pop(qov);
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QObject *value = qmp_output_pop(qov);
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assert(qobject_type(value) == QTYPE_QDICT);
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}
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static void qmp_output_start_list(Visitor *v, const char *name, Error **errp)
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@ -145,7 +146,8 @@ static GenericList *qmp_output_next_list(Visitor *v, GenericList **listp,
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static void qmp_output_end_list(Visitor *v)
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{
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QmpOutputVisitor *qov = to_qov(v);
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qmp_output_pop(qov);
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QObject *value = qmp_output_pop(qov);
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assert(qobject_type(value) == QTYPE_QLIST);
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}
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static void qmp_output_type_int64(Visitor *v, const char *name, int64_t *obj,
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@ -202,18 +204,16 @@ static void qmp_output_type_null(Visitor *v, const char *name, Error **errp)
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qmp_output_add_obj(qov, name, qnull());
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}
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/* Finish building, and return the root object. Will not be NULL. */
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/* Finish building, and return the root object.
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* The root object is never null. The caller becomes the object's
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* owner, and should use qobject_decref() when done with it. */
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QObject *qmp_output_get_qobject(QmpOutputVisitor *qov)
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{
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/* FIXME: we should require that a visit occurred, and that it is
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* complete (no starts without a matching end) */
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QObject *obj = qov->root;
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if (obj) {
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qobject_incref(obj);
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} else {
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obj = qnull();
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}
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return obj;
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/* A visit must have occurred, with each start paired with end. */
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assert(qov->root && QTAILQ_EMPTY(&qov->stack));
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qobject_incref(qov->root);
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return qov->root;
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}
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Visitor *qmp_output_get_visitor(QmpOutputVisitor *v)
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