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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 "qmp-input-visitor.h" | |
15 | #include "qemu-queue.h" | |
16 | #include "qemu-common.h" | |
17 | #include "qemu-objects.h" | |
18 | #include "qerror.h" | |
19 | ||
20 | #define QIV_STACK_SIZE 1024 | |
21 | ||
22 | typedef struct StackObject | |
23 | { | |
24 | const QObject *obj; | |
25 | const QListEntry *entry; | |
26 | } StackObject; | |
27 | ||
28 | struct QmpInputVisitor | |
29 | { | |
30 | Visitor visitor; | |
31 | QObject *obj; | |
32 | StackObject stack[QIV_STACK_SIZE]; | |
33 | int nb_stack; | |
34 | }; | |
35 | ||
36 | static QmpInputVisitor *to_qiv(Visitor *v) | |
37 | { | |
38 | return container_of(v, QmpInputVisitor, visitor); | |
39 | } | |
40 | ||
41 | static const QObject *qmp_input_get_object(QmpInputVisitor *qiv, | |
42 | const char *name) | |
43 | { | |
44 | const QObject *qobj; | |
45 | ||
46 | if (qiv->nb_stack == 0) { | |
47 | qobj = qiv->obj; | |
48 | } else { | |
49 | qobj = qiv->stack[qiv->nb_stack - 1].obj; | |
50 | } | |
51 | ||
52 | if (name && qobject_type(qobj) == QTYPE_QDICT) { | |
53 | return qdict_get(qobject_to_qdict(qobj), name); | |
54 | } else if (qiv->nb_stack > 0 && qobject_type(qobj) == QTYPE_QLIST) { | |
55 | return qlist_entry_obj(qiv->stack[qiv->nb_stack - 1].entry); | |
56 | } | |
57 | ||
58 | return qobj; | |
59 | } | |
60 | ||
61 | static void qmp_input_push(QmpInputVisitor *qiv, const QObject *obj, Error **errp) | |
62 | { | |
63 | qiv->stack[qiv->nb_stack].obj = obj; | |
64 | if (qobject_type(obj) == QTYPE_QLIST) { | |
65 | qiv->stack[qiv->nb_stack].entry = qlist_first(qobject_to_qlist(obj)); | |
66 | } | |
67 | qiv->nb_stack++; | |
68 | ||
69 | if (qiv->nb_stack >= QIV_STACK_SIZE) { | |
70 | error_set(errp, QERR_BUFFER_OVERRUN); | |
71 | return; | |
72 | } | |
73 | } | |
74 | ||
75 | static void qmp_input_pop(QmpInputVisitor *qiv, Error **errp) | |
76 | { | |
77 | qiv->nb_stack--; | |
78 | if (qiv->nb_stack < 0) { | |
79 | error_set(errp, QERR_BUFFER_OVERRUN); | |
80 | return; | |
81 | } | |
82 | } | |
83 | ||
84 | static void qmp_input_start_struct(Visitor *v, void **obj, const char *kind, | |
85 | const char *name, size_t size, Error **errp) | |
86 | { | |
87 | QmpInputVisitor *qiv = to_qiv(v); | |
88 | const QObject *qobj = qmp_input_get_object(qiv, name); | |
89 | ||
90 | if (!qobj || qobject_type(qobj) != QTYPE_QDICT) { | |
91 | error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", | |
92 | "QDict"); | |
93 | return; | |
94 | } | |
95 | ||
96 | qmp_input_push(qiv, qobj, errp); | |
97 | if (error_is_set(errp)) { | |
98 | return; | |
99 | } | |
100 | ||
101 | if (obj) { | |
102 | *obj = qemu_mallocz(size); | |
103 | } | |
104 | } | |
105 | ||
106 | static void qmp_input_end_struct(Visitor *v, Error **errp) | |
107 | { | |
108 | QmpInputVisitor *qiv = to_qiv(v); | |
109 | ||
110 | qmp_input_pop(qiv, errp); | |
111 | } | |
112 | ||
113 | static void qmp_input_start_list(Visitor *v, const char *name, Error **errp) | |
114 | { | |
115 | QmpInputVisitor *qiv = to_qiv(v); | |
116 | const QObject *qobj = qmp_input_get_object(qiv, name); | |
117 | ||
118 | if (!qobj || qobject_type(qobj) != QTYPE_QLIST) { | |
119 | error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", | |
120 | "list"); | |
121 | return; | |
122 | } | |
123 | ||
124 | qmp_input_push(qiv, qobj, errp); | |
125 | } | |
126 | ||
127 | static GenericList *qmp_input_next_list(Visitor *v, GenericList **list, | |
128 | Error **errp) | |
129 | { | |
130 | QmpInputVisitor *qiv = to_qiv(v); | |
131 | GenericList *entry; | |
132 | StackObject *so = &qiv->stack[qiv->nb_stack - 1]; | |
133 | ||
134 | if (so->entry == NULL) { | |
135 | return NULL; | |
136 | } | |
137 | ||
138 | entry = qemu_mallocz(sizeof(*entry)); | |
139 | if (*list) { | |
140 | so->entry = qlist_next(so->entry); | |
141 | if (so->entry == NULL) { | |
142 | qemu_free(entry); | |
143 | return NULL; | |
144 | } | |
145 | (*list)->next = entry; | |
146 | } | |
147 | *list = entry; | |
148 | ||
149 | ||
150 | return entry; | |
151 | } | |
152 | ||
153 | static void qmp_input_end_list(Visitor *v, Error **errp) | |
154 | { | |
155 | QmpInputVisitor *qiv = to_qiv(v); | |
156 | ||
157 | qmp_input_pop(qiv, errp); | |
158 | } | |
159 | ||
160 | static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name, | |
161 | Error **errp) | |
162 | { | |
163 | QmpInputVisitor *qiv = to_qiv(v); | |
164 | const QObject *qobj = qmp_input_get_object(qiv, name); | |
165 | ||
166 | if (!qobj || qobject_type(qobj) != QTYPE_QINT) { | |
167 | error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", | |
168 | "integer"); | |
169 | return; | |
170 | } | |
171 | ||
172 | *obj = qint_get_int(qobject_to_qint(qobj)); | |
173 | } | |
174 | ||
175 | static void qmp_input_type_bool(Visitor *v, bool *obj, const char *name, | |
176 | Error **errp) | |
177 | { | |
178 | QmpInputVisitor *qiv = to_qiv(v); | |
179 | const QObject *qobj = qmp_input_get_object(qiv, name); | |
180 | ||
181 | if (!qobj || qobject_type(qobj) != QTYPE_QBOOL) { | |
182 | error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", | |
183 | "boolean"); | |
184 | return; | |
185 | } | |
186 | ||
187 | *obj = qbool_get_int(qobject_to_qbool(qobj)); | |
188 | } | |
189 | ||
190 | static void qmp_input_type_str(Visitor *v, char **obj, const char *name, | |
191 | Error **errp) | |
192 | { | |
193 | QmpInputVisitor *qiv = to_qiv(v); | |
194 | const QObject *qobj = qmp_input_get_object(qiv, name); | |
195 | ||
196 | if (!qobj || qobject_type(qobj) != QTYPE_QSTRING) { | |
197 | error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", | |
198 | "string"); | |
199 | return; | |
200 | } | |
201 | ||
202 | *obj = qemu_strdup(qstring_get_str(qobject_to_qstring(qobj))); | |
203 | } | |
204 | ||
205 | static void qmp_input_type_number(Visitor *v, double *obj, const char *name, | |
206 | Error **errp) | |
207 | { | |
208 | QmpInputVisitor *qiv = to_qiv(v); | |
209 | const QObject *qobj = qmp_input_get_object(qiv, name); | |
210 | ||
211 | if (!qobj || qobject_type(qobj) != QTYPE_QFLOAT) { | |
212 | error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", | |
213 | "double"); | |
214 | return; | |
215 | } | |
216 | ||
217 | *obj = qfloat_get_double(qobject_to_qfloat(qobj)); | |
218 | } | |
219 | ||
220 | static void qmp_input_type_enum(Visitor *v, int *obj, const char *strings[], | |
221 | const char *kind, const char *name, | |
222 | Error **errp) | |
223 | { | |
224 | int64_t value = 0; | |
225 | char *enum_str; | |
226 | ||
227 | assert(strings); | |
228 | ||
229 | qmp_input_type_str(v, &enum_str, name, errp); | |
230 | if (error_is_set(errp)) { | |
231 | return; | |
232 | } | |
233 | ||
234 | while (strings[value] != NULL) { | |
235 | if (strcmp(strings[value], enum_str) == 0) { | |
236 | break; | |
237 | } | |
238 | value++; | |
239 | } | |
240 | ||
241 | if (strings[value] == NULL) { | |
242 | error_set(errp, QERR_INVALID_PARAMETER, name ? name : "null"); | |
243 | return; | |
244 | } | |
245 | ||
246 | *obj = value; | |
247 | } | |
248 | ||
249 | static void qmp_input_start_optional(Visitor *v, bool *present, | |
250 | const char *name, Error **errp) | |
251 | { | |
252 | QmpInputVisitor *qiv = to_qiv(v); | |
253 | const QObject *qobj = qmp_input_get_object(qiv, name); | |
254 | ||
255 | if (!qobj) { | |
256 | *present = false; | |
257 | return; | |
258 | } | |
259 | ||
260 | *present = true; | |
261 | } | |
262 | ||
263 | static void qmp_input_end_optional(Visitor *v, Error **errp) | |
264 | { | |
265 | } | |
266 | ||
267 | Visitor *qmp_input_get_visitor(QmpInputVisitor *v) | |
268 | { | |
269 | return &v->visitor; | |
270 | } | |
271 | ||
272 | void qmp_input_visitor_cleanup(QmpInputVisitor *v) | |
273 | { | |
274 | qobject_decref(v->obj); | |
275 | qemu_free(v); | |
276 | } | |
277 | ||
278 | QmpInputVisitor *qmp_input_visitor_new(QObject *obj) | |
279 | { | |
280 | QmpInputVisitor *v; | |
281 | ||
282 | v = qemu_mallocz(sizeof(*v)); | |
283 | ||
284 | v->visitor.start_struct = qmp_input_start_struct; | |
285 | v->visitor.end_struct = qmp_input_end_struct; | |
286 | v->visitor.start_list = qmp_input_start_list; | |
287 | v->visitor.next_list = qmp_input_next_list; | |
288 | v->visitor.end_list = qmp_input_end_list; | |
289 | v->visitor.type_enum = qmp_input_type_enum; | |
290 | v->visitor.type_int = qmp_input_type_int; | |
291 | v->visitor.type_bool = qmp_input_type_bool; | |
292 | v->visitor.type_str = qmp_input_type_str; | |
293 | v->visitor.type_number = qmp_input_type_number; | |
294 | v->visitor.start_optional = qmp_input_start_optional; | |
295 | v->visitor.end_optional = qmp_input_end_optional; | |
296 | ||
297 | v->obj = obj; | |
298 | qobject_incref(v->obj); | |
299 | ||
300 | return v; | |
301 | } |