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qmp: Tighten output visitor rules

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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 commit
ab8bf1d7 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 commit bdd8e6b5.

- 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)

Backports commit 56a6f02b8ce1fe41a2a9077593e46eca7d98267d from qemu
This commit is contained in:
Eric Blake 2018-02-23 19:04:38 -05:00 committed by Lioncash
parent e5b2cff2bd
commit ae8d475ae0
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 15 additions and 15 deletions
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30
qemu/qapi/qmp-output-visitor.c
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@ -83,9 +83,8 @@ static void qmp_output_add_obj(QmpOutputVisitor *qov, const char *name,
QObject *cur = e ? e->value : NULL;
if (!cur) {
/* FIXME we should require the user to reset the visitor, rather
* than throwing away the previous root */
qobject_decref(qov->root);
/* Don't allow reuse of visitor on more than one root */
assert(!qov->root);
qov->root = value;
} else {
switch (qobject_type(cur)) {
@ -94,6 +93,7 @@ static void qmp_output_add_obj(QmpOutputVisitor *qov, const char *name,
qdict_put_obj(qobject_to_qdict(cur), name, value);
break;
case QTYPE_QLIST:
assert(!name);
qlist_append_obj(qobject_to_qlist(cur), value);
break;
default:
@ -115,7 +115,8 @@ static void qmp_output_start_struct(Visitor *v, const char *name, void **obj,
static void qmp_output_end_struct(Visitor *v, Error **errp)
{
QmpOutputVisitor *qov = to_qov(v);
qmp_output_pop(qov);
QObject *value = qmp_output_pop(qov);
assert(qobject_type(value) == QTYPE_QDICT);
}
static void qmp_output_start_list(Visitor *v, const char *name, Error **errp)
@ -146,7 +147,8 @@ static GenericList *qmp_output_next_list(Visitor *v, GenericList **listp,
static void qmp_output_end_list(Visitor *v)
{
QmpOutputVisitor *qov = to_qov(v);
qmp_output_pop(qov);
QObject *value = qmp_output_pop(qov);
assert(qobject_type(value) == QTYPE_QLIST);
}
static void qmp_output_type_int64(Visitor *v, const char *name, int64_t *obj,
@ -203,18 +205,16 @@ static void qmp_output_type_null(Visitor *v, const char *name, Error **errp)
qmp_output_add_obj(qov, name, qnull());
}
/* Finish building, and return the root object. Will not be NULL. */
/* Finish building, and return the root object.
* The root object is never null. The caller becomes the object's
* owner, and should use qobject_decref() when done with it. */
QObject *qmp_output_get_qobject(QmpOutputVisitor *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 {
obj = qnull();
}
return obj;
/* A visit must have occurred, with each start paired with end. */
assert(qov->root && QTAILQ_EMPTY(&qov->stack));
qobject_incref(qov->root);
return qov->root;
}
Visitor *qmp_output_get_visitor(QmpOutputVisitor *v)