321 lines
8.0 KiB
C
321 lines
8.0 KiB
C
/*
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* Input Visitor
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qapi/qmp-input-visitor.h"
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#include "qapi/visitor-impl.h"
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#include "qemu/queue.h"
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#include "qemu-common.h"
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#include "qapi/qmp/types.h"
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#include "qapi/qmp/qerror.h"
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#define QIV_STACK_SIZE 1024
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typedef struct StackObject
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{
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QObject *obj;
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const QListEntry *entry;
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GHashTable *h;
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} StackObject;
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struct QmpInputVisitor
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{
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Visitor visitor;
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StackObject stack[QIV_STACK_SIZE];
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int nb_stack;
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bool strict;
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};
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static QmpInputVisitor *to_qiv(Visitor *v)
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{
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return container_of(v, QmpInputVisitor, visitor);
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}
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static QObject *qmp_input_get_object(QmpInputVisitor *qiv,
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const char *name)
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{
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QObject *qobj = qiv->stack[qiv->nb_stack - 1].obj;
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if (qobj) {
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if (name && qobject_type(qobj) == QTYPE_QDICT) {
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if (qiv->stack[qiv->nb_stack - 1].h) {
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g_hash_table_remove(qiv->stack[qiv->nb_stack - 1].h, name);
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}
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return qdict_get(qobject_to_qdict(qobj), name);
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} else if (qiv->stack[qiv->nb_stack - 1].entry) {
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return qlist_entry_obj(qiv->stack[qiv->nb_stack - 1].entry);
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}
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}
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return qobj;
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}
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static void qdict_add_key(const char *key, QObject *obj, void *opaque)
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{
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GHashTable *h = opaque;
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g_hash_table_insert(h, (gpointer) key, NULL);
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}
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static void qmp_input_push(QmpInputVisitor *qiv, QObject *obj, Error **errp)
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{
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GHashTable *h;
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if (qiv->nb_stack >= QIV_STACK_SIZE) {
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error_set(errp, QERR_BUFFER_OVERRUN);
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return;
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}
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qiv->stack[qiv->nb_stack].obj = obj;
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qiv->stack[qiv->nb_stack].entry = NULL;
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qiv->stack[qiv->nb_stack].h = NULL;
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if (qiv->strict && qobject_type(obj) == QTYPE_QDICT) {
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h = g_hash_table_new(g_str_hash, g_str_equal);
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qdict_iter(qobject_to_qdict(obj), qdict_add_key, h);
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qiv->stack[qiv->nb_stack].h = h;
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}
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qiv->nb_stack++;
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}
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/** Only for qmp_input_pop. */
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static gboolean always_true(gpointer key, gpointer val, gpointer user_pkey)
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{
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*(const char **)user_pkey = (const char *)key;
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return TRUE;
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}
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static void qmp_input_pop(QmpInputVisitor *qiv, Error **errp)
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{
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assert(qiv->nb_stack > 0);
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if (qiv->strict) {
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GHashTable * const top_ht = qiv->stack[qiv->nb_stack - 1].h;
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if (top_ht) {
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if (g_hash_table_size(top_ht)) {
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const char *key;
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g_hash_table_find(top_ht, always_true, &key);
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error_set(errp, QERR_QMP_EXTRA_MEMBER, key);
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}
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g_hash_table_unref(top_ht);
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}
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}
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qiv->nb_stack--;
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}
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static void qmp_input_start_struct(Visitor *v, void **obj, const char *kind,
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const char *name, size_t size, Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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QObject *qobj = qmp_input_get_object(qiv, name);
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Error *err = NULL;
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if (!qobj || qobject_type(qobj) != QTYPE_QDICT) {
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error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
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"QDict");
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return;
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}
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qmp_input_push(qiv, qobj, &err);
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if (err) {
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error_propagate(errp, err);
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return;
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}
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if (obj) {
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*obj = g_malloc0(size);
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}
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}
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static void qmp_input_end_struct(Visitor *v, Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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qmp_input_pop(qiv, errp);
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}
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static void qmp_input_start_list(Visitor *v, const char *name, Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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QObject *qobj = qmp_input_get_object(qiv, name);
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if (!qobj || qobject_type(qobj) != QTYPE_QLIST) {
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error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
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"list");
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return;
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}
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qmp_input_push(qiv, qobj, errp);
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}
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static GenericList *qmp_input_next_list(Visitor *v, GenericList **list,
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Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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GenericList *entry;
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StackObject *so = &qiv->stack[qiv->nb_stack - 1];
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bool first;
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if (so->entry == NULL) {
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so->entry = qlist_first(qobject_to_qlist(so->obj));
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first = true;
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} else {
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so->entry = qlist_next(so->entry);
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first = false;
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}
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if (so->entry == NULL) {
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return NULL;
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}
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entry = g_malloc0(sizeof(*entry));
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if (first) {
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*list = entry;
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} else {
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(*list)->next = entry;
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}
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return entry;
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}
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static void qmp_input_end_list(Visitor *v, Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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qmp_input_pop(qiv, errp);
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}
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static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name,
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Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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QObject *qobj = qmp_input_get_object(qiv, name);
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if (!qobj || qobject_type(qobj) != QTYPE_QINT) {
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error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
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"integer");
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return;
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}
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*obj = qint_get_int(qobject_to_qint(qobj));
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}
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static void qmp_input_type_bool(Visitor *v, bool *obj, const char *name,
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Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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QObject *qobj = qmp_input_get_object(qiv, name);
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if (!qobj || qobject_type(qobj) != QTYPE_QBOOL) {
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error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
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"boolean");
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return;
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}
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*obj = qbool_get_int(qobject_to_qbool(qobj));
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}
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static void qmp_input_type_str(Visitor *v, char **obj, const char *name,
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Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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QObject *qobj = qmp_input_get_object(qiv, name);
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if (!qobj || qobject_type(qobj) != QTYPE_QSTRING) {
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error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
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"string");
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return;
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}
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*obj = g_strdup(qstring_get_str(qobject_to_qstring(qobj)));
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}
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static void qmp_input_type_number(Visitor *v, double *obj, const char *name,
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Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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QObject *qobj = qmp_input_get_object(qiv, name);
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if (!qobj || (qobject_type(qobj) != QTYPE_QFLOAT &&
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qobject_type(qobj) != QTYPE_QINT)) {
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error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
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"number");
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return;
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}
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if (qobject_type(qobj) == QTYPE_QINT) {
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*obj = qint_get_int(qobject_to_qint(qobj));
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} else {
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*obj = qfloat_get_double(qobject_to_qfloat(qobj));
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}
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}
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static void qmp_input_start_optional(Visitor *v, bool *present,
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const char *name, Error **errp)
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{
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QmpInputVisitor *qiv = to_qiv(v);
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QObject *qobj = qmp_input_get_object(qiv, name);
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if (!qobj) {
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*present = false;
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return;
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}
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*present = true;
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}
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Visitor *qmp_input_get_visitor(QmpInputVisitor *v)
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{
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return &v->visitor;
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}
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void qmp_input_visitor_cleanup(QmpInputVisitor *v)
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{
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qobject_decref(v->stack[0].obj);
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g_free(v);
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}
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QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
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{
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QmpInputVisitor *v;
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v = g_malloc0(sizeof(*v));
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v->visitor.start_struct = qmp_input_start_struct;
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v->visitor.end_struct = qmp_input_end_struct;
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v->visitor.start_list = qmp_input_start_list;
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v->visitor.next_list = qmp_input_next_list;
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v->visitor.end_list = qmp_input_end_list;
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v->visitor.type_enum = input_type_enum;
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v->visitor.type_int = qmp_input_type_int;
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v->visitor.type_bool = qmp_input_type_bool;
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v->visitor.type_str = qmp_input_type_str;
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v->visitor.type_number = qmp_input_type_number;
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v->visitor.start_optional = qmp_input_start_optional;
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qmp_input_push(v, obj, NULL);
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qobject_incref(obj);
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return v;
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}
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QmpInputVisitor *qmp_input_visitor_new_strict(QObject *obj)
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{
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QmpInputVisitor *v;
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v = qmp_input_visitor_new(obj);
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v->strict = true;
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return v;
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}
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