qemu/qapi/qmp-input-visitor.c

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/*
* 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 = g_malloc0(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 = g_malloc0(sizeof(*entry));
if (*list) {
so->entry = qlist_next(so->entry);
if (so->entry == NULL) {
g_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 = g_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);
g_free(v);
}
QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
{
QmpInputVisitor *v;
v = g_malloc0(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;
}