unicorn/qemu/qapi/qmp-output-visitor.c
Eric Blake 1f54314cbb
qapi: Drop unused 'kind' for struct/enum visit
visit_start_struct() and visit_type_enum() had a 'kind' argument
that was usually set to either the stringized version of the
corresponding qapi type name, or to NULL (although some clients
didn't even get that right). But nothing ever used the argument.
It's even hard to argue that it would be useful in a debugger,
as a stack backtrace also tells which type is being visited.

Therefore, drop the 'kind' argument as dead.

Backports commit 337283dffbb5ad5860ed00408a5fd0665c21be07 from qemu
2018-02-19 23:43:54 -05:00

259 lines
6.4 KiB
C

/*
* 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 "qemu/osdep.h"
#include "qapi/qmp-output-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"
typedef struct QStackEntry
{
QObject *value;
bool is_list_head;
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 = g_malloc0(sizeof(*e));
e->value = value;
if (qobject_type(e->value) == QTYPE_QLIST) {
e->is_list_head = true;
}
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;
g_free(e);
return value;
}
static QObject *qmp_output_first(QmpOutputVisitor *qov)
{
QStackEntry *e = QTAILQ_LAST(&qov->stack, QStack);
/* FIXME - find a better way to deal with NULL values */
if (!e) {
return NULL;
}
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, const char *name, void **obj,
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 **listp)
{
GenericList *list = *listp;
QmpOutputVisitor *qov = to_qov(v);
QStackEntry *e = QTAILQ_FIRST(&qov->stack);
assert(e);
if (e->is_list_head) {
e->is_list_head = false;
return list;
}
return list ? list->next : NULL;
}
static void qmp_output_end_list(Visitor *v)
{
QmpOutputVisitor *qov = to_qov(v);
qmp_output_pop(qov);
}
static void qmp_output_type_int64(Visitor *v, const char *name, int64_t *obj,
Error **errp)
{
QmpOutputVisitor *qov = to_qov(v);
qmp_output_add(qov, name, qint_from_int(*obj));
}
static void qmp_output_type_uint64(Visitor *v, const char *name, uint64_t *obj,
Error **errp)
{
/* FIXME: QMP outputs values larger than INT64_MAX as negative */
QmpOutputVisitor *qov = to_qov(v);
qmp_output_add(qov, name, qint_from_int(*obj));
}
static void qmp_output_type_bool(Visitor *v, const char *name, bool *obj,
Error **errp)
{
QmpOutputVisitor *qov = to_qov(v);
qmp_output_add(qov, name, qbool_from_bool(*obj));
}
static void qmp_output_type_str(Visitor *v, const char *name, char **obj,
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, const char *name, double *obj,
Error **errp)
{
QmpOutputVisitor *qov = to_qov(v);
qmp_output_add(qov, name, qfloat_from_double(*obj));
}
static void qmp_output_type_any(Visitor *v, const char *name, QObject **obj,
Error **errp)
{
QmpOutputVisitor *qov = to_qov(v);
qobject_incref(*obj);
qmp_output_add_obj(qov, name, *obj);
}
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;
/* The bottom QStackEntry, if any, owns the root QObject. See the
* qmp_output_push_obj() invocations in qmp_output_add_obj(). */
QObject *root = QTAILQ_EMPTY(&v->stack) ? NULL : qmp_output_first(v);
QTAILQ_FOREACH_SAFE(e, &v->stack, node, tmp) {
QTAILQ_REMOVE(&v->stack, e, node);
g_free(e);
}
qobject_decref(root);
g_free(v);
}
QmpOutputVisitor *qmp_output_visitor_new(void)
{
QmpOutputVisitor *v;
v = g_malloc0(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 = output_type_enum;
v->visitor.type_int64 = qmp_output_type_int64;
v->visitor.type_uint64 = qmp_output_type_uint64;
v->visitor.type_bool = qmp_output_type_bool;
v->visitor.type_str = qmp_output_type_str;
v->visitor.type_number = qmp_output_type_number;
v->visitor.type_any = qmp_output_type_any;
QTAILQ_INIT(&v->stack);
return v;
}