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qemu-e2k/qapi/qobject-input-visitor.c

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/*
* Input Visitor
*
* Copyright (C) 2012-2016 Red Hat, Inc.
* 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 "qemu/osdep.h"
#include "qapi/error.h"
#include "qapi/qobject-input-visitor.h"
#include "qapi/visitor-impl.h"
#include "qemu/queue.h"
#include "qemu-common.h"
#include "qapi/qmp/types.h"
#include "qapi/qmp/qerror.h"
#define QIV_STACK_SIZE 1024
typedef struct StackObject
{
QObject *obj; /* Object being visited */
void *qapi; /* sanity check that caller uses same pointer */
GHashTable *h; /* If obj is dict: unvisited keys */
const QListEntry *entry; /* If obj is list: unvisited tail */
QSLIST_ENTRY(StackObject) node;
} StackObject;
struct QObjectInputVisitor
{
Visitor visitor;
/* Root of visit at visitor creation. */
QObject *root;
/* Stack of objects being visited (all entries will be either
* QDict or QList). */
QSLIST_HEAD(, StackObject) stack;
/* True to reject parse in visit_end_struct() if unvisited keys remain. */
bool strict;
};
static QObjectInputVisitor *to_qiv(Visitor *v)
{
return container_of(v, QObjectInputVisitor, visitor);
}
static QObject *qobject_input_get_object(QObjectInputVisitor *qiv,
const char *name,
bool consume, Error **errp)
{
StackObject *tos;
QObject *qobj;
QObject *ret;
if (QSLIST_EMPTY(&qiv->stack)) {
/* Starting at root, name is ignored. */
assert(qiv->root);
return qiv->root;
}
/* We are in a container; find the next element. */
tos = QSLIST_FIRST(&qiv->stack);
qobj = tos->obj;
assert(qobj);
if (qobject_type(qobj) == QTYPE_QDICT) {
assert(name);
ret = qdict_get(qobject_to_qdict(qobj), name);
if (tos->h && consume && ret) {
bool removed = g_hash_table_remove(tos->h, name);
assert(removed);
}
if (!ret) {
error_setg(errp, QERR_MISSING_PARAMETER, name);
}
} else {
assert(qobject_type(qobj) == QTYPE_QLIST);
assert(!name);
ret = qlist_entry_obj(tos->entry);
assert(ret);
if (consume) {
tos->entry = qlist_next(tos->entry);
}
}
return ret;
}
static void qdict_add_key(const char *key, QObject *obj, void *opaque)
{
GHashTable *h = opaque;
g_hash_table_insert(h, (gpointer) key, NULL);
}
static const QListEntry *qobject_input_push(QObjectInputVisitor *qiv,
QObject *obj, void *qapi,
Error **errp)
{
GHashTable *h;
StackObject *tos = g_new0(StackObject, 1);
assert(obj);
tos->obj = obj;
tos->qapi = qapi;
if (qiv->strict && qobject_type(obj) == QTYPE_QDICT) {
h = g_hash_table_new(g_str_hash, g_str_equal);
qdict_iter(qobject_to_qdict(obj), qdict_add_key, h);
tos->h = h;
} else if (qobject_type(obj) == QTYPE_QLIST) {
tos->entry = qlist_first(qobject_to_qlist(obj));
}
QSLIST_INSERT_HEAD(&qiv->stack, tos, node);
return tos->entry;
}
static void qobject_input_check_struct(Visitor *v, Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
StackObject *tos = QSLIST_FIRST(&qiv->stack);
assert(tos && !tos->entry);
if (qiv->strict) {
GHashTable *const top_ht = tos->h;
if (top_ht) {
GHashTableIter iter;
const char *key;
g_hash_table_iter_init(&iter, top_ht);
if (g_hash_table_iter_next(&iter, (void **)&key, NULL)) {
error_setg(errp, QERR_QMP_EXTRA_MEMBER, key);
}
}
}
}
static void qobject_input_stack_object_free(StackObject *tos)
{
if (tos->h) {
g_hash_table_unref(tos->h);
}
g_free(tos);
}
static void qobject_input_pop(Visitor *v, void **obj)
{
QObjectInputVisitor *qiv = to_qiv(v);
StackObject *tos = QSLIST_FIRST(&qiv->stack);
assert(tos && tos->qapi == obj);
QSLIST_REMOVE_HEAD(&qiv->stack, node);
qobject_input_stack_object_free(tos);
}
static void qobject_input_start_struct(Visitor *v, const char *name, void **obj,
size_t size, Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
Error *err = NULL;
if (obj) {
*obj = NULL;
}
if (!qobj) {
return;
}
if (qobject_type(qobj) != QTYPE_QDICT) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"QDict");
return;
}
qobject_input_push(qiv, qobj, obj, &err);
if (err) {
error_propagate(errp, err);
return;
}
if (obj) {
*obj = g_malloc0(size);
}
}
static void qobject_input_start_list(Visitor *v, const char *name,
GenericList **list, size_t size,
Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
const QListEntry *entry;
if (!qobj) {
return;
}
if (qobject_type(qobj) != QTYPE_QLIST) {
if (list) {
*list = NULL;
}
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"list");
return;
}
entry = qobject_input_push(qiv, qobj, list, errp);
if (list) {
if (entry) {
*list = g_malloc0(size);
} else {
*list = NULL;
}
}
}
static GenericList *qobject_input_next_list(Visitor *v, GenericList *tail,
size_t size)
{
QObjectInputVisitor *qiv = to_qiv(v);
StackObject *so = QSLIST_FIRST(&qiv->stack);
if (!so->entry) {
return NULL;
}
tail->next = g_malloc0(size);
return tail->next;
}
static void qobject_input_start_alternate(Visitor *v, const char *name,
GenericAlternate **obj, size_t size,
bool promote_int, Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, false, errp);
if (!qobj) {
*obj = NULL;
return;
}
*obj = g_malloc0(size);
(*obj)->type = qobject_type(qobj);
if (promote_int && (*obj)->type == QTYPE_QINT) {
(*obj)->type = QTYPE_QFLOAT;
}
}
static void qobject_input_type_int64(Visitor *v, const char *name, int64_t *obj,
Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
QInt *qint;
if (!qobj) {
return;
}
qint = qobject_to_qint(qobj);
if (!qint) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"integer");
return;
}
*obj = qint_get_int(qint);
}
static void qobject_input_type_uint64(Visitor *v, const char *name,
uint64_t *obj, Error **errp)
{
/* FIXME: qobject_to_qint mishandles values over INT64_MAX */
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
QInt *qint;
if (!qobj) {
return;
}
qint = qobject_to_qint(qobj);
if (!qint) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"integer");
return;
}
*obj = qint_get_int(qint);
}
static void qobject_input_type_bool(Visitor *v, const char *name, bool *obj,
Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
QBool *qbool;
if (!qobj) {
return;
}
qbool = qobject_to_qbool(qobj);
if (!qbool) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"boolean");
return;
}
*obj = qbool_get_bool(qbool);
}
static void qobject_input_type_str(Visitor *v, const char *name, char **obj,
Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
QString *qstr;
*obj = NULL;
if (!qobj) {
return;
}
qstr = qobject_to_qstring(qobj);
if (!qstr) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"string");
return;
}
*obj = g_strdup(qstring_get_str(qstr));
}
static void qobject_input_type_number(Visitor *v, const char *name, double *obj,
Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
QInt *qint;
QFloat *qfloat;
if (!qobj) {
return;
}
qint = qobject_to_qint(qobj);
if (qint) {
*obj = qint_get_int(qobject_to_qint(qobj));
return;
}
qfloat = qobject_to_qfloat(qobj);
if (qfloat) {
*obj = qfloat_get_double(qobject_to_qfloat(qobj));
return;
}
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"number");
}
static void qobject_input_type_any(Visitor *v, const char *name, QObject **obj,
Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
*obj = NULL;
if (!qobj) {
return;
}
qobject_incref(qobj);
*obj = qobj;
}
static void qobject_input_type_null(Visitor *v, const char *name, Error **errp)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
if (!qobj) {
return;
}
if (qobject_type(qobj) != QTYPE_QNULL) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"null");
}
}
static void qobject_input_optional(Visitor *v, const char *name, bool *present)
{
QObjectInputVisitor *qiv = to_qiv(v);
QObject *qobj = qobject_input_get_object(qiv, name, false, NULL);
if (!qobj) {
*present = false;
return;
}
*present = true;
}
static void qobject_input_free(Visitor *v)
{
QObjectInputVisitor *qiv = to_qiv(v);
while (!QSLIST_EMPTY(&qiv->stack)) {
StackObject *tos = QSLIST_FIRST(&qiv->stack);
QSLIST_REMOVE_HEAD(&qiv->stack, node);
qobject_input_stack_object_free(tos);
}
qobject_decref(qiv->root);
g_free(qiv);
}
Visitor *qobject_input_visitor_new(QObject *obj, bool strict)
{
QObjectInputVisitor *v;
assert(obj);
v = g_malloc0(sizeof(*v));
v->visitor.type = VISITOR_INPUT;
v->visitor.start_struct = qobject_input_start_struct;
v->visitor.check_struct = qobject_input_check_struct;
v->visitor.end_struct = qobject_input_pop;
v->visitor.start_list = qobject_input_start_list;
v->visitor.next_list = qobject_input_next_list;
v->visitor.end_list = qobject_input_pop;
v->visitor.start_alternate = qobject_input_start_alternate;
v->visitor.type_int64 = qobject_input_type_int64;
v->visitor.type_uint64 = qobject_input_type_uint64;
v->visitor.type_bool = qobject_input_type_bool;
v->visitor.type_str = qobject_input_type_str;
v->visitor.type_number = qobject_input_type_number;
v->visitor.type_any = qobject_input_type_any;
v->visitor.type_null = qobject_input_type_null;
v->visitor.optional = qobject_input_optional;
v->visitor.free = qobject_input_free;
v->strict = strict;
v->root = obj;
qobject_incref(obj);
return &v->visitor;
}
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