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qapi: Add visitor for implicit structs 

These can be used when an embedded struct is parsed and members not
belonging to the struct may be present in the input (e.g. parsing a
flat namespace QMP union, where fields from both the base and one
of the alternative types are mixed in the JSON object)

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2013-07-03 15:52:42 +02:00
parent 51631493e4
commit 761d524dbc
4 changed files with 37 additions and 0 deletions
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4
include/qapi/visitor-impl.h
View File

@ -22,6 +22,10 @@ struct Visitor
const char *name, size_t size, Error **errp);
void (*end_struct)(Visitor *v, Error **errp);
void (*start_implicit_struct)(Visitor *v, void **obj, size_t size,
Error **errp);
void (*end_implicit_struct)(Visitor *v, Error **errp);
void (*start_list)(Visitor *v, const char *name, Error **errp);
GenericList *(*next_list)(Visitor *v, GenericList **list, Error **errp);
void (*end_list)(Visitor *v, Error **errp);

3
include/qapi/visitor.h
View File

@ -33,6 +33,9 @@ void visit_end_handle(Visitor *v, Error **errp);
void visit_start_struct(Visitor *v, void **obj, const char *kind,
const char *name, size_t size, Error **errp);
void visit_end_struct(Visitor *v, Error **errp);
void visit_start_implicit_struct(Visitor *v, void **obj, size_t size,
Error **errp);
void visit_end_implicit_struct(Visitor *v, Error **errp);
void visit_start_list(Visitor *v, const char *name, Error **errp);
GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp);
void visit_end_list(Visitor *v, Error **errp);

16
qapi/qapi-visit-core.c
View File

@ -45,6 +45,22 @@ void visit_end_struct(Visitor *v, Error **errp)
v->end_struct(v, errp);
}
void visit_start_implicit_struct(Visitor *v, void **obj, size_t size,
Error **errp)
{
if (!error_is_set(errp) && v->start_implicit_struct) {
v->start_implicit_struct(v, obj, size, errp);
}
}
void visit_end_implicit_struct(Visitor *v, Error **errp)
{
assert(!error_is_set(errp));
if (v->end_implicit_struct) {
v->end_implicit_struct(v, errp);
}
}
void visit_start_list(Visitor *v, const char *name, Error **errp)
{
if (!error_is_set(errp)) {

14
qapi/qmp-input-visitor.c
View File

@ -144,6 +144,18 @@ static void qmp_input_end_struct(Visitor *v, Error **errp)
qmp_input_pop(qiv, errp);
}
static void qmp_input_start_implicit_struct(Visitor *v, void **obj,
size_t size, Error **errp)
{
if (obj) {
*obj = g_malloc0(size);
}
}
static void qmp_input_end_implicit_struct(Visitor *v, Error **errp)
{
}
static void qmp_input_start_list(Visitor *v, const char *name, Error **errp)
{
QmpInputVisitor *qiv = to_qiv(v);
@ -293,6 +305,8 @@ QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
v->visitor.start_struct = qmp_input_start_struct;
v->visitor.end_struct = qmp_input_end_struct;
v->visitor.start_implicit_struct = qmp_input_start_implicit_struct;
v->visitor.end_implicit_struct = qmp_input_end_implicit_struct;
v->visitor.start_list = qmp_input_start_list;
v->visitor.next_list = qmp_input_next_list;
v->visitor.end_list = qmp_input_end_list;