diff options
Diffstat (limited to 'qapi/qmp-input-visitor.c')
| -rw-r--r-- | qapi/qmp-input-visitor.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c new file mode 100644 index 0000000000..6a1adc9fce --- /dev/null +++ b/qapi/qmp-input-visitor.c @@ -0,0 +1,301 @@ +/* + * Input Visitor + * + * 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-input-visitor.h" +#include "qemu-queue.h" +#include "qemu-common.h" +#include "qemu-objects.h" +#include "qerror.h" + +#define QIV_STACK_SIZE 1024 + +typedef struct StackObject +{ + const QObject *obj; + const QListEntry *entry; +} StackObject; + +struct QmpInputVisitor +{ + Visitor visitor; + QObject *obj; + StackObject stack[QIV_STACK_SIZE]; + int nb_stack; +}; + +static QmpInputVisitor *to_qiv(Visitor *v) +{ + return container_of(v, QmpInputVisitor, visitor); +} + +static const QObject *qmp_input_get_object(QmpInputVisitor *qiv, + const char *name) +{ + const QObject *qobj; + + if (qiv->nb_stack == 0) { + qobj = qiv->obj; + } else { + qobj = qiv->stack[qiv->nb_stack - 1].obj; + } + + if (name && qobject_type(qobj) == QTYPE_QDICT) { + return qdict_get(qobject_to_qdict(qobj), name); + } else if (qiv->nb_stack > 0 && qobject_type(qobj) == QTYPE_QLIST) { + return qlist_entry_obj(qiv->stack[qiv->nb_stack - 1].entry); + } + + return qobj; +} + +static void qmp_input_push(QmpInputVisitor *qiv, const QObject *obj, Error **errp) +{ + qiv->stack[qiv->nb_stack].obj = obj; + if (qobject_type(obj) == QTYPE_QLIST) { + qiv->stack[qiv->nb_stack].entry = qlist_first(qobject_to_qlist(obj)); + } + qiv->nb_stack++; + + if (qiv->nb_stack >= QIV_STACK_SIZE) { + error_set(errp, QERR_BUFFER_OVERRUN); + return; + } +} + +static void qmp_input_pop(QmpInputVisitor *qiv, Error **errp) +{ + qiv->nb_stack--; + if (qiv->nb_stack < 0) { + error_set(errp, QERR_BUFFER_OVERRUN); + return; + } +} + +static void qmp_input_start_struct(Visitor *v, void **obj, const char *kind, + const char *name, size_t size, Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + const QObject *qobj = qmp_input_get_object(qiv, name); + + if (!qobj || qobject_type(qobj) != QTYPE_QDICT) { + error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", + "QDict"); + return; + } + + qmp_input_push(qiv, qobj, errp); + if (error_is_set(errp)) { + return; + } + + if (obj) { + *obj = qemu_mallocz(size); + } +} + +static void qmp_input_end_struct(Visitor *v, Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + + qmp_input_pop(qiv, errp); +} + +static void qmp_input_start_list(Visitor *v, const char *name, Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + const QObject *qobj = qmp_input_get_object(qiv, name); + + if (!qobj || qobject_type(qobj) != QTYPE_QLIST) { + error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", + "list"); + return; + } + + qmp_input_push(qiv, qobj, errp); +} + +static GenericList *qmp_input_next_list(Visitor *v, GenericList **list, + Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + GenericList *entry; + StackObject *so = &qiv->stack[qiv->nb_stack - 1]; + + if (so->entry == NULL) { + return NULL; + } + + entry = qemu_mallocz(sizeof(*entry)); + if (*list) { + so->entry = qlist_next(so->entry); + if (so->entry == NULL) { + qemu_free(entry); + return NULL; + } + (*list)->next = entry; + } + *list = entry; + + + return entry; +} + +static void qmp_input_end_list(Visitor *v, Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + + qmp_input_pop(qiv, errp); +} + +static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name, + Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + const QObject *qobj = qmp_input_get_object(qiv, name); + + if (!qobj || qobject_type(qobj) != QTYPE_QINT) { + error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", + "integer"); + return; + } + + *obj = qint_get_int(qobject_to_qint(qobj)); +} + +static void qmp_input_type_bool(Visitor *v, bool *obj, const char *name, + Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + const QObject *qobj = qmp_input_get_object(qiv, name); + + if (!qobj || qobject_type(qobj) != QTYPE_QBOOL) { + error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", + "boolean"); + return; + } + + *obj = qbool_get_int(qobject_to_qbool(qobj)); +} + +static void qmp_input_type_str(Visitor *v, char **obj, const char *name, + Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + const QObject *qobj = qmp_input_get_object(qiv, name); + + if (!qobj || qobject_type(qobj) != QTYPE_QSTRING) { + error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", + "string"); + return; + } + + *obj = qemu_strdup(qstring_get_str(qobject_to_qstring(qobj))); +} + +static void qmp_input_type_number(Visitor *v, double *obj, const char *name, + Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + const QObject *qobj = qmp_input_get_object(qiv, name); + + if (!qobj || qobject_type(qobj) != QTYPE_QFLOAT) { + error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", + "double"); + return; + } + + *obj = qfloat_get_double(qobject_to_qfloat(qobj)); +} + +static void qmp_input_type_enum(Visitor *v, int *obj, const char *strings[], + const char *kind, const char *name, + Error **errp) +{ + int64_t value = 0; + char *enum_str; + + assert(strings); + + qmp_input_type_str(v, &enum_str, name, errp); + if (error_is_set(errp)) { + return; + } + + while (strings[value] != NULL) { + if (strcmp(strings[value], enum_str) == 0) { + break; + } + value++; + } + + if (strings[value] == NULL) { + error_set(errp, QERR_INVALID_PARAMETER, name ? name : "null"); + return; + } + + *obj = value; +} + +static void qmp_input_start_optional(Visitor *v, bool *present, + const char *name, Error **errp) +{ + QmpInputVisitor *qiv = to_qiv(v); + const QObject *qobj = qmp_input_get_object(qiv, name); + + if (!qobj) { + *present = false; + return; + } + + *present = true; +} + +static void qmp_input_end_optional(Visitor *v, Error **errp) +{ +} + +Visitor *qmp_input_get_visitor(QmpInputVisitor *v) +{ + return &v->visitor; +} + +void qmp_input_visitor_cleanup(QmpInputVisitor *v) +{ + qobject_decref(v->obj); + qemu_free(v); +} + +QmpInputVisitor *qmp_input_visitor_new(QObject *obj) +{ + QmpInputVisitor *v; + + v = qemu_mallocz(sizeof(*v)); + + v->visitor.start_struct = qmp_input_start_struct; + v->visitor.end_struct = qmp_input_end_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; + v->visitor.type_enum = qmp_input_type_enum; + v->visitor.type_int = qmp_input_type_int; + v->visitor.type_bool = qmp_input_type_bool; + v->visitor.type_str = qmp_input_type_str; + v->visitor.type_number = qmp_input_type_number; + v->visitor.start_optional = qmp_input_start_optional; + v->visitor.end_optional = qmp_input_end_optional; + + v->obj = obj; + qobject_incref(v->obj); + + return v; +} |