migration: do floating-point division
[qemu.git] / qapi / qmp-input-visitor.c
blobeb6e110300a02bd4c9397a231161af5e5a5317a2
1 /*
2 * Input Visitor
4 * Copyright IBM, Corp. 2011
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
10 * See the COPYING.LIB file in the top-level directory.
14 #include "qapi/qmp-input-visitor.h"
15 #include "qapi/visitor-impl.h"
16 #include "qemu/queue.h"
17 #include "qemu-common.h"
18 #include "qapi/qmp/types.h"
19 #include "qapi/qmp/qerror.h"
21 #define QIV_STACK_SIZE 1024
23 typedef struct StackObject
25 QObject *obj;
26 const QListEntry *entry;
27 GHashTable *h;
28 } StackObject;
30 struct QmpInputVisitor
32 Visitor visitor;
33 StackObject stack[QIV_STACK_SIZE];
34 int nb_stack;
35 bool strict;
38 static QmpInputVisitor *to_qiv(Visitor *v)
40 return container_of(v, QmpInputVisitor, visitor);
43 static QObject *qmp_input_get_object(QmpInputVisitor *qiv,
44 const char *name,
45 bool consume)
47 QObject *qobj = qiv->stack[qiv->nb_stack - 1].obj;
49 if (qobj) {
50 if (name && qobject_type(qobj) == QTYPE_QDICT) {
51 if (qiv->stack[qiv->nb_stack - 1].h && consume) {
52 g_hash_table_remove(qiv->stack[qiv->nb_stack - 1].h, name);
54 return qdict_get(qobject_to_qdict(qobj), name);
55 } else if (qiv->stack[qiv->nb_stack - 1].entry) {
56 return qlist_entry_obj(qiv->stack[qiv->nb_stack - 1].entry);
60 return qobj;
63 static void qdict_add_key(const char *key, QObject *obj, void *opaque)
65 GHashTable *h = opaque;
66 g_hash_table_insert(h, (gpointer) key, NULL);
69 static void qmp_input_push(QmpInputVisitor *qiv, QObject *obj, Error **errp)
71 GHashTable *h;
73 if (qiv->nb_stack >= QIV_STACK_SIZE) {
74 error_setg(errp, "An internal buffer overran");
75 return;
78 qiv->stack[qiv->nb_stack].obj = obj;
79 qiv->stack[qiv->nb_stack].entry = NULL;
80 qiv->stack[qiv->nb_stack].h = NULL;
82 if (qiv->strict && qobject_type(obj) == QTYPE_QDICT) {
83 h = g_hash_table_new(g_str_hash, g_str_equal);
84 qdict_iter(qobject_to_qdict(obj), qdict_add_key, h);
85 qiv->stack[qiv->nb_stack].h = h;
88 qiv->nb_stack++;
91 /** Only for qmp_input_pop. */
92 static gboolean always_true(gpointer key, gpointer val, gpointer user_pkey)
94 *(const char **)user_pkey = (const char *)key;
95 return TRUE;
98 static void qmp_input_pop(QmpInputVisitor *qiv, Error **errp)
100 assert(qiv->nb_stack > 0);
102 if (qiv->strict) {
103 GHashTable * const top_ht = qiv->stack[qiv->nb_stack - 1].h;
104 if (top_ht) {
105 if (g_hash_table_size(top_ht)) {
106 const char *key;
107 g_hash_table_find(top_ht, always_true, &key);
108 error_setg(errp, QERR_QMP_EXTRA_MEMBER, key);
110 g_hash_table_unref(top_ht);
114 qiv->nb_stack--;
117 static void qmp_input_start_struct(Visitor *v, void **obj, const char *kind,
118 const char *name, size_t size, Error **errp)
120 QmpInputVisitor *qiv = to_qiv(v);
121 QObject *qobj = qmp_input_get_object(qiv, name, true);
122 Error *err = NULL;
124 if (!qobj || qobject_type(qobj) != QTYPE_QDICT) {
125 error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
126 "QDict");
127 return;
130 qmp_input_push(qiv, qobj, &err);
131 if (err) {
132 error_propagate(errp, err);
133 return;
136 if (obj) {
137 *obj = g_malloc0(size);
141 static void qmp_input_end_struct(Visitor *v, Error **errp)
143 QmpInputVisitor *qiv = to_qiv(v);
145 qmp_input_pop(qiv, errp);
148 static void qmp_input_start_implicit_struct(Visitor *v, void **obj,
149 size_t size, Error **errp)
151 if (obj) {
152 *obj = g_malloc0(size);
156 static void qmp_input_end_implicit_struct(Visitor *v, Error **errp)
160 static void qmp_input_start_list(Visitor *v, const char *name, Error **errp)
162 QmpInputVisitor *qiv = to_qiv(v);
163 QObject *qobj = qmp_input_get_object(qiv, name, true);
165 if (!qobj || qobject_type(qobj) != QTYPE_QLIST) {
166 error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
167 "list");
168 return;
171 qmp_input_push(qiv, qobj, errp);
174 static GenericList *qmp_input_next_list(Visitor *v, GenericList **list,
175 Error **errp)
177 QmpInputVisitor *qiv = to_qiv(v);
178 GenericList *entry;
179 StackObject *so = &qiv->stack[qiv->nb_stack - 1];
180 bool first;
182 if (so->entry == NULL) {
183 so->entry = qlist_first(qobject_to_qlist(so->obj));
184 first = true;
185 } else {
186 so->entry = qlist_next(so->entry);
187 first = false;
190 if (so->entry == NULL) {
191 return NULL;
194 entry = g_malloc0(sizeof(*entry));
195 if (first) {
196 *list = entry;
197 } else {
198 (*list)->next = entry;
201 return entry;
204 static void qmp_input_end_list(Visitor *v, Error **errp)
206 QmpInputVisitor *qiv = to_qiv(v);
208 qmp_input_pop(qiv, errp);
211 static void qmp_input_get_next_type(Visitor *v, int *kind, const int *qobjects,
212 const char *name, Error **errp)
214 QmpInputVisitor *qiv = to_qiv(v);
215 QObject *qobj = qmp_input_get_object(qiv, name, false);
217 if (!qobj) {
218 error_setg(errp, QERR_MISSING_PARAMETER, name ? name : "null");
219 return;
221 *kind = qobjects[qobject_type(qobj)];
224 static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name,
225 Error **errp)
227 QmpInputVisitor *qiv = to_qiv(v);
228 QInt *qint = qobject_to_qint(qmp_input_get_object(qiv, name, true));
230 if (!qint) {
231 error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
232 "integer");
233 return;
236 *obj = qint_get_int(qint);
239 static void qmp_input_type_bool(Visitor *v, bool *obj, const char *name,
240 Error **errp)
242 QmpInputVisitor *qiv = to_qiv(v);
243 QBool *qbool = qobject_to_qbool(qmp_input_get_object(qiv, name, true));
245 if (!qbool) {
246 error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
247 "boolean");
248 return;
251 *obj = qbool_get_bool(qbool);
254 static void qmp_input_type_str(Visitor *v, char **obj, const char *name,
255 Error **errp)
257 QmpInputVisitor *qiv = to_qiv(v);
258 QString *qstr = qobject_to_qstring(qmp_input_get_object(qiv, name, true));
260 if (!qstr) {
261 error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
262 "string");
263 return;
266 *obj = g_strdup(qstring_get_str(qstr));
269 static void qmp_input_type_number(Visitor *v, double *obj, const char *name,
270 Error **errp)
272 QmpInputVisitor *qiv = to_qiv(v);
273 QObject *qobj = qmp_input_get_object(qiv, name, true);
274 QInt *qint;
275 QFloat *qfloat;
277 qint = qobject_to_qint(qobj);
278 if (qint) {
279 *obj = qint_get_int(qobject_to_qint(qobj));
280 return;
283 qfloat = qobject_to_qfloat(qobj);
284 if (qfloat) {
285 *obj = qfloat_get_double(qobject_to_qfloat(qobj));
286 return;
289 error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
290 "number");
293 static void qmp_input_type_any(Visitor *v, QObject **obj, const char *name,
294 Error **errp)
296 QmpInputVisitor *qiv = to_qiv(v);
297 QObject *qobj = qmp_input_get_object(qiv, name, true);
299 qobject_incref(qobj);
300 *obj = qobj;
303 static void qmp_input_optional(Visitor *v, bool *present, const char *name,
304 Error **errp)
306 QmpInputVisitor *qiv = to_qiv(v);
307 QObject *qobj = qmp_input_get_object(qiv, name, true);
309 if (!qobj) {
310 *present = false;
311 return;
314 *present = true;
317 Visitor *qmp_input_get_visitor(QmpInputVisitor *v)
319 return &v->visitor;
322 void qmp_input_visitor_cleanup(QmpInputVisitor *v)
324 qobject_decref(v->stack[0].obj);
325 g_free(v);
328 QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
330 QmpInputVisitor *v;
332 v = g_malloc0(sizeof(*v));
334 v->visitor.start_struct = qmp_input_start_struct;
335 v->visitor.end_struct = qmp_input_end_struct;
336 v->visitor.start_implicit_struct = qmp_input_start_implicit_struct;
337 v->visitor.end_implicit_struct = qmp_input_end_implicit_struct;
338 v->visitor.start_list = qmp_input_start_list;
339 v->visitor.next_list = qmp_input_next_list;
340 v->visitor.end_list = qmp_input_end_list;
341 v->visitor.type_enum = input_type_enum;
342 v->visitor.type_int = qmp_input_type_int;
343 v->visitor.type_bool = qmp_input_type_bool;
344 v->visitor.type_str = qmp_input_type_str;
345 v->visitor.type_number = qmp_input_type_number;
346 v->visitor.type_any = qmp_input_type_any;
347 v->visitor.optional = qmp_input_optional;
348 v->visitor.get_next_type = qmp_input_get_next_type;
350 qmp_input_push(v, obj, NULL);
351 qobject_incref(obj);
353 return v;
356 QmpInputVisitor *qmp_input_visitor_new_strict(QObject *obj)
358 QmpInputVisitor *v;
360 v = qmp_input_visitor_new(obj);
361 v->strict = true;
363 return v;