virtio-scsi: work around bug in old BIOSes
[qemu.git] / qapi / qmp-input-visitor.c
1 /*
2 * Input Visitor
3 *
4 * Copyright IBM, Corp. 2011
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
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.
11 *
12 */
13
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"
20
21 #define QIV_STACK_SIZE 1024
22
23 typedef struct StackObject
24 {
25 QObject *obj;
26 const QListEntry *entry;
27 GHashTable *h;
28 } StackObject;
29
30 struct QmpInputVisitor
31 {
32 Visitor visitor;
33 StackObject stack[QIV_STACK_SIZE];
34 int nb_stack;
35 bool strict;
36 };
37
38 static QmpInputVisitor *to_qiv(Visitor *v)
39 {
40 return container_of(v, QmpInputVisitor, visitor);
41 }
42
43 static QObject *qmp_input_get_object(QmpInputVisitor *qiv,
44 const char *name,
45 bool consume)
46 {
47 QObject *qobj = qiv->stack[qiv->nb_stack - 1].obj;
48
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);
53 }
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);
57 }
58 }
59
60 return qobj;
61 }
62
63 static void qdict_add_key(const char *key, QObject *obj, void *opaque)
64 {
65 GHashTable *h = opaque;
66 g_hash_table_insert(h, (gpointer) key, NULL);
67 }
68
69 static void qmp_input_push(QmpInputVisitor *qiv, QObject *obj, Error **errp)
70 {
71 GHashTable *h;
72
73 if (qiv->nb_stack >= QIV_STACK_SIZE) {
74 error_setg(errp, "An internal buffer overran");
75 return;
76 }
77
78 qiv->stack[qiv->nb_stack].obj = obj;
79 qiv->stack[qiv->nb_stack].entry = NULL;
80 qiv->stack[qiv->nb_stack].h = NULL;
81
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;
86 }
87
88 qiv->nb_stack++;
89 }
90
91 /** Only for qmp_input_pop. */
92 static gboolean always_true(gpointer key, gpointer val, gpointer user_pkey)
93 {
94 *(const char **)user_pkey = (const char *)key;
95 return TRUE;
96 }
97
98 static void qmp_input_pop(QmpInputVisitor *qiv, Error **errp)
99 {
100 assert(qiv->nb_stack > 0);
101
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_set(errp, QERR_QMP_EXTRA_MEMBER, key);
109 }
110 g_hash_table_unref(top_ht);
111 }
112 }
113
114 qiv->nb_stack--;
115 }
116
117 static void qmp_input_start_struct(Visitor *v, void **obj, const char *kind,
118 const char *name, size_t size, Error **errp)
119 {
120 QmpInputVisitor *qiv = to_qiv(v);
121 QObject *qobj = qmp_input_get_object(qiv, name, true);
122 Error *err = NULL;
123
124 if (!qobj || qobject_type(qobj) != QTYPE_QDICT) {
125 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
126 "QDict");
127 return;
128 }
129
130 qmp_input_push(qiv, qobj, &err);
131 if (err) {
132 error_propagate(errp, err);
133 return;
134 }
135
136 if (obj) {
137 *obj = g_malloc0(size);
138 }
139 }
140
141 static void qmp_input_end_struct(Visitor *v, Error **errp)
142 {
143 QmpInputVisitor *qiv = to_qiv(v);
144
145 qmp_input_pop(qiv, errp);
146 }
147
148 static void qmp_input_start_implicit_struct(Visitor *v, void **obj,
149 size_t size, Error **errp)
150 {
151 if (obj) {
152 *obj = g_malloc0(size);
153 }
154 }
155
156 static void qmp_input_end_implicit_struct(Visitor *v, Error **errp)
157 {
158 }
159
160 static void qmp_input_start_list(Visitor *v, const char *name, Error **errp)
161 {
162 QmpInputVisitor *qiv = to_qiv(v);
163 QObject *qobj = qmp_input_get_object(qiv, name, true);
164
165 if (!qobj || qobject_type(qobj) != QTYPE_QLIST) {
166 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
167 "list");
168 return;
169 }
170
171 qmp_input_push(qiv, qobj, errp);
172 }
173
174 static GenericList *qmp_input_next_list(Visitor *v, GenericList **list,
175 Error **errp)
176 {
177 QmpInputVisitor *qiv = to_qiv(v);
178 GenericList *entry;
179 StackObject *so = &qiv->stack[qiv->nb_stack - 1];
180 bool first;
181
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;
188 }
189
190 if (so->entry == NULL) {
191 return NULL;
192 }
193
194 entry = g_malloc0(sizeof(*entry));
195 if (first) {
196 *list = entry;
197 } else {
198 (*list)->next = entry;
199 }
200
201 return entry;
202 }
203
204 static void qmp_input_end_list(Visitor *v, Error **errp)
205 {
206 QmpInputVisitor *qiv = to_qiv(v);
207
208 qmp_input_pop(qiv, errp);
209 }
210
211 static void qmp_input_get_next_type(Visitor *v, int *kind, const int *qobjects,
212 const char *name, Error **errp)
213 {
214 QmpInputVisitor *qiv = to_qiv(v);
215 QObject *qobj = qmp_input_get_object(qiv, name, false);
216
217 if (!qobj) {
218 error_set(errp, QERR_MISSING_PARAMETER, name ? name : "null");
219 return;
220 }
221 *kind = qobjects[qobject_type(qobj)];
222 }
223
224 static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name,
225 Error **errp)
226 {
227 QmpInputVisitor *qiv = to_qiv(v);
228 QObject *qobj = qmp_input_get_object(qiv, name, true);
229
230 if (!qobj || qobject_type(qobj) != QTYPE_QINT) {
231 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
232 "integer");
233 return;
234 }
235
236 *obj = qint_get_int(qobject_to_qint(qobj));
237 }
238
239 static void qmp_input_type_bool(Visitor *v, bool *obj, const char *name,
240 Error **errp)
241 {
242 QmpInputVisitor *qiv = to_qiv(v);
243 QObject *qobj = qmp_input_get_object(qiv, name, true);
244
245 if (!qobj || qobject_type(qobj) != QTYPE_QBOOL) {
246 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
247 "boolean");
248 return;
249 }
250
251 *obj = qbool_get_int(qobject_to_qbool(qobj));
252 }
253
254 static void qmp_input_type_str(Visitor *v, char **obj, const char *name,
255 Error **errp)
256 {
257 QmpInputVisitor *qiv = to_qiv(v);
258 QObject *qobj = qmp_input_get_object(qiv, name, true);
259
260 if (!qobj || qobject_type(qobj) != QTYPE_QSTRING) {
261 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
262 "string");
263 return;
264 }
265
266 *obj = g_strdup(qstring_get_str(qobject_to_qstring(qobj)));
267 }
268
269 static void qmp_input_type_number(Visitor *v, double *obj, const char *name,
270 Error **errp)
271 {
272 QmpInputVisitor *qiv = to_qiv(v);
273 QObject *qobj = qmp_input_get_object(qiv, name, true);
274
275 if (!qobj || (qobject_type(qobj) != QTYPE_QFLOAT &&
276 qobject_type(qobj) != QTYPE_QINT)) {
277 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
278 "number");
279 return;
280 }
281
282 if (qobject_type(qobj) == QTYPE_QINT) {
283 *obj = qint_get_int(qobject_to_qint(qobj));
284 } else {
285 *obj = qfloat_get_double(qobject_to_qfloat(qobj));
286 }
287 }
288
289 static void qmp_input_optional(Visitor *v, bool *present, const char *name,
290 Error **errp)
291 {
292 QmpInputVisitor *qiv = to_qiv(v);
293 QObject *qobj = qmp_input_get_object(qiv, name, true);
294
295 if (!qobj) {
296 *present = false;
297 return;
298 }
299
300 *present = true;
301 }
302
303 Visitor *qmp_input_get_visitor(QmpInputVisitor *v)
304 {
305 return &v->visitor;
306 }
307
308 void qmp_input_visitor_cleanup(QmpInputVisitor *v)
309 {
310 qobject_decref(v->stack[0].obj);
311 g_free(v);
312 }
313
314 QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
315 {
316 QmpInputVisitor *v;
317
318 v = g_malloc0(sizeof(*v));
319
320 v->visitor.start_struct = qmp_input_start_struct;
321 v->visitor.end_struct = qmp_input_end_struct;
322 v->visitor.start_implicit_struct = qmp_input_start_implicit_struct;
323 v->visitor.end_implicit_struct = qmp_input_end_implicit_struct;
324 v->visitor.start_list = qmp_input_start_list;
325 v->visitor.next_list = qmp_input_next_list;
326 v->visitor.end_list = qmp_input_end_list;
327 v->visitor.type_enum = input_type_enum;
328 v->visitor.type_int = qmp_input_type_int;
329 v->visitor.type_bool = qmp_input_type_bool;
330 v->visitor.type_str = qmp_input_type_str;
331 v->visitor.type_number = qmp_input_type_number;
332 v->visitor.optional = qmp_input_optional;
333 v->visitor.get_next_type = qmp_input_get_next_type;
334
335 qmp_input_push(v, obj, NULL);
336 qobject_incref(obj);
337
338 return v;
339 }
340
341 QmpInputVisitor *qmp_input_visitor_new_strict(QObject *obj)
342 {
343 QmpInputVisitor *v;
344
345 v = qmp_input_visitor_new(obj);
346 v->strict = true;
347
348 return v;
349 }