diff options
Diffstat (limited to 'qapi/qmp-output-visitor.c')
| -rw-r--r-- | qapi/qmp-output-visitor.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/qapi/qmp-output-visitor.c b/qapi/qmp-output-visitor.c new file mode 100644 index 0000000000..c398cac4f0 --- /dev/null +++ b/qapi/qmp-output-visitor.c @@ -0,0 +1,239 @@ +/* + * Core Definitions for QAPI/QMP Command Registry + * + * Copyright IBM, Corp. 2011 + * + * Authors: + * Anthony Liguori <aliguori@us.ibm.com> + * + * This work is licensed under the terms of the GNU LGPL, version 2.1 or later. + * See the COPYING.LIB file in the top-level directory. + * + */ + +#include "qmp-output-visitor.h" +#include "qemu-queue.h" +#include "qemu-common.h" +#include "qemu-objects.h" +#include "qerror.h" + +typedef struct QStackEntry +{ + QObject *value; + QTAILQ_ENTRY(QStackEntry) node; +} QStackEntry; + +typedef QTAILQ_HEAD(QStack, QStackEntry) QStack; + +struct QmpOutputVisitor +{ + Visitor visitor; + QStack stack; +}; + +#define qmp_output_add(qov, name, value) \ + qmp_output_add_obj(qov, name, QOBJECT(value)) +#define qmp_output_push(qov, value) qmp_output_push_obj(qov, QOBJECT(value)) + +static QmpOutputVisitor *to_qov(Visitor *v) +{ + return container_of(v, QmpOutputVisitor, visitor); +} + +static void qmp_output_push_obj(QmpOutputVisitor *qov, QObject *value) +{ + QStackEntry *e = qemu_mallocz(sizeof(*e)); + + e->value = value; + QTAILQ_INSERT_HEAD(&qov->stack, e, node); +} + +static QObject *qmp_output_pop(QmpOutputVisitor *qov) +{ + QStackEntry *e = QTAILQ_FIRST(&qov->stack); + QObject *value; + QTAILQ_REMOVE(&qov->stack, e, node); + value = e->value; + qemu_free(e); + return value; +} + +static QObject *qmp_output_first(QmpOutputVisitor *qov) +{ + QStackEntry *e = QTAILQ_LAST(&qov->stack, QStack); + return e->value; +} + +static QObject *qmp_output_last(QmpOutputVisitor *qov) +{ + QStackEntry *e = QTAILQ_FIRST(&qov->stack); + return e->value; +} + +static void qmp_output_add_obj(QmpOutputVisitor *qov, const char *name, + QObject *value) +{ + QObject *cur; + + if (QTAILQ_EMPTY(&qov->stack)) { + qmp_output_push_obj(qov, value); + return; + } + + cur = qmp_output_last(qov); + + switch (qobject_type(cur)) { + case QTYPE_QDICT: + qdict_put_obj(qobject_to_qdict(cur), name, value); + break; + case QTYPE_QLIST: + qlist_append_obj(qobject_to_qlist(cur), value); + break; + default: + qobject_decref(qmp_output_pop(qov)); + qmp_output_push_obj(qov, value); + break; + } +} + +static void qmp_output_start_struct(Visitor *v, void **obj, const char *kind, + const char *name, size_t unused, + Error **errp) +{ + QmpOutputVisitor *qov = to_qov(v); + QDict *dict = qdict_new(); + + qmp_output_add(qov, name, dict); + qmp_output_push(qov, dict); +} + +static void qmp_output_end_struct(Visitor *v, Error **errp) +{ + QmpOutputVisitor *qov = to_qov(v); + qmp_output_pop(qov); +} + +static void qmp_output_start_list(Visitor *v, const char *name, Error **errp) +{ + QmpOutputVisitor *qov = to_qov(v); + QList *list = qlist_new(); + + qmp_output_add(qov, name, list); + qmp_output_push(qov, list); +} + +static GenericList *qmp_output_next_list(Visitor *v, GenericList **list, + Error **errp) +{ + GenericList *retval = *list; + *list = retval->next; + return retval; +} + +static void qmp_output_end_list(Visitor *v, Error **errp) +{ + QmpOutputVisitor *qov = to_qov(v); + qmp_output_pop(qov); +} + +static void qmp_output_type_int(Visitor *v, int64_t *obj, const char *name, + Error **errp) +{ + QmpOutputVisitor *qov = to_qov(v); + qmp_output_add(qov, name, qint_from_int(*obj)); +} + +static void qmp_output_type_bool(Visitor *v, bool *obj, const char *name, + Error **errp) +{ + QmpOutputVisitor *qov = to_qov(v); + qmp_output_add(qov, name, qbool_from_int(*obj)); +} + +static void qmp_output_type_str(Visitor *v, char **obj, const char *name, + Error **errp) +{ + QmpOutputVisitor *qov = to_qov(v); + if (*obj) { + qmp_output_add(qov, name, qstring_from_str(*obj)); + } else { + qmp_output_add(qov, name, qstring_from_str("")); + } +} + +static void qmp_output_type_number(Visitor *v, double *obj, const char *name, + Error **errp) +{ + QmpOutputVisitor *qov = to_qov(v); + qmp_output_add(qov, name, qfloat_from_double(*obj)); +} + +static void qmp_output_type_enum(Visitor *v, int *obj, const char *strings[], + const char *kind, const char *name, + Error **errp) +{ + int i = 0; + int value = *obj; + char *enum_str; + + assert(strings); + while (strings[i++] != NULL); + if (value >= i - 1) { + error_set(errp, QERR_INVALID_PARAMETER, name ? name : "null"); + return; + } + + enum_str = (char *)strings[value]; + qmp_output_type_str(v, &enum_str, name, errp); +} + +QObject *qmp_output_get_qobject(QmpOutputVisitor *qov) +{ + QObject *obj = qmp_output_first(qov); + if (obj) { + qobject_incref(obj); + } + return obj; +} + +Visitor *qmp_output_get_visitor(QmpOutputVisitor *v) +{ + return &v->visitor; +} + +void qmp_output_visitor_cleanup(QmpOutputVisitor *v) +{ + QStackEntry *e, *tmp; + + QTAILQ_FOREACH_SAFE(e, &v->stack, node, tmp) { + QTAILQ_REMOVE(&v->stack, e, node); + if (e->value) { + qobject_decref(e->value); + } + qemu_free(e); + } + + qemu_free(v); +} + +QmpOutputVisitor *qmp_output_visitor_new(void) +{ + QmpOutputVisitor *v; + + v = qemu_mallocz(sizeof(*v)); + + v->visitor.start_struct = qmp_output_start_struct; + v->visitor.end_struct = qmp_output_end_struct; + v->visitor.start_list = qmp_output_start_list; + v->visitor.next_list = qmp_output_next_list; + v->visitor.end_list = qmp_output_end_list; + v->visitor.type_enum = qmp_output_type_enum; + v->visitor.type_int = qmp_output_type_int; + v->visitor.type_bool = qmp_output_type_bool; + v->visitor.type_str = qmp_output_type_str; + v->visitor.type_number = qmp_output_type_number; + + QTAILQ_INIT(&v->stack); + + return v; +} |