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e4e6aa14 MR |
1 | /* |
2 | * Core Definitions for QAPI/QMP Command Registry | |
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 | ||
7b1b5d19 PB |
14 | #include "qapi/qmp-output-visitor.h" |
15 | #include "qapi/visitor-impl.h" | |
1de7afc9 | 16 | #include "qemu/queue.h" |
e4e6aa14 | 17 | #include "qemu-common.h" |
7b1b5d19 | 18 | #include "qapi/qmp/types.h" |
e4e6aa14 MR |
19 | |
20 | typedef struct QStackEntry | |
21 | { | |
22 | QObject *value; | |
e1bc2f7b | 23 | bool is_list_head; |
e4e6aa14 MR |
24 | QTAILQ_ENTRY(QStackEntry) node; |
25 | } QStackEntry; | |
26 | ||
27 | typedef QTAILQ_HEAD(QStack, QStackEntry) QStack; | |
28 | ||
29 | struct QmpOutputVisitor | |
30 | { | |
31 | Visitor visitor; | |
32 | QStack stack; | |
33 | }; | |
34 | ||
35 | #define qmp_output_add(qov, name, value) \ | |
36 | qmp_output_add_obj(qov, name, QOBJECT(value)) | |
37 | #define qmp_output_push(qov, value) qmp_output_push_obj(qov, QOBJECT(value)) | |
38 | ||
39 | static QmpOutputVisitor *to_qov(Visitor *v) | |
40 | { | |
41 | return container_of(v, QmpOutputVisitor, visitor); | |
42 | } | |
43 | ||
44 | static void qmp_output_push_obj(QmpOutputVisitor *qov, QObject *value) | |
45 | { | |
7267c094 | 46 | QStackEntry *e = g_malloc0(sizeof(*e)); |
e4e6aa14 MR |
47 | |
48 | e->value = value; | |
e1bc2f7b MR |
49 | if (qobject_type(e->value) == QTYPE_QLIST) { |
50 | e->is_list_head = true; | |
51 | } | |
e4e6aa14 MR |
52 | QTAILQ_INSERT_HEAD(&qov->stack, e, node); |
53 | } | |
54 | ||
55 | static QObject *qmp_output_pop(QmpOutputVisitor *qov) | |
56 | { | |
57 | QStackEntry *e = QTAILQ_FIRST(&qov->stack); | |
58 | QObject *value; | |
59 | QTAILQ_REMOVE(&qov->stack, e, node); | |
60 | value = e->value; | |
7267c094 | 61 | g_free(e); |
e4e6aa14 MR |
62 | return value; |
63 | } | |
64 | ||
65 | static QObject *qmp_output_first(QmpOutputVisitor *qov) | |
66 | { | |
67 | QStackEntry *e = QTAILQ_LAST(&qov->stack, QStack); | |
1d10b445 MA |
68 | |
69 | /* FIXME - find a better way to deal with NULL values */ | |
70 | if (!e) { | |
71 | return NULL; | |
72 | } | |
73 | ||
e4e6aa14 MR |
74 | return e->value; |
75 | } | |
76 | ||
77 | static QObject *qmp_output_last(QmpOutputVisitor *qov) | |
78 | { | |
79 | QStackEntry *e = QTAILQ_FIRST(&qov->stack); | |
80 | return e->value; | |
81 | } | |
82 | ||
83 | static void qmp_output_add_obj(QmpOutputVisitor *qov, const char *name, | |
84 | QObject *value) | |
85 | { | |
86 | QObject *cur; | |
87 | ||
88 | if (QTAILQ_EMPTY(&qov->stack)) { | |
89 | qmp_output_push_obj(qov, value); | |
90 | return; | |
91 | } | |
92 | ||
93 | cur = qmp_output_last(qov); | |
94 | ||
95 | switch (qobject_type(cur)) { | |
96 | case QTYPE_QDICT: | |
97 | qdict_put_obj(qobject_to_qdict(cur), name, value); | |
98 | break; | |
99 | case QTYPE_QLIST: | |
100 | qlist_append_obj(qobject_to_qlist(cur), value); | |
101 | break; | |
102 | default: | |
103 | qobject_decref(qmp_output_pop(qov)); | |
104 | qmp_output_push_obj(qov, value); | |
105 | break; | |
106 | } | |
107 | } | |
108 | ||
109 | static void qmp_output_start_struct(Visitor *v, void **obj, const char *kind, | |
110 | const char *name, size_t unused, | |
111 | Error **errp) | |
112 | { | |
113 | QmpOutputVisitor *qov = to_qov(v); | |
114 | QDict *dict = qdict_new(); | |
115 | ||
116 | qmp_output_add(qov, name, dict); | |
117 | qmp_output_push(qov, dict); | |
118 | } | |
119 | ||
120 | static void qmp_output_end_struct(Visitor *v, Error **errp) | |
121 | { | |
122 | QmpOutputVisitor *qov = to_qov(v); | |
123 | qmp_output_pop(qov); | |
124 | } | |
125 | ||
126 | static void qmp_output_start_list(Visitor *v, const char *name, Error **errp) | |
127 | { | |
128 | QmpOutputVisitor *qov = to_qov(v); | |
129 | QList *list = qlist_new(); | |
130 | ||
131 | qmp_output_add(qov, name, list); | |
132 | qmp_output_push(qov, list); | |
133 | } | |
134 | ||
e1bc2f7b | 135 | static GenericList *qmp_output_next_list(Visitor *v, GenericList **listp, |
e4e6aa14 MR |
136 | Error **errp) |
137 | { | |
e1bc2f7b MR |
138 | GenericList *list = *listp; |
139 | QmpOutputVisitor *qov = to_qov(v); | |
140 | QStackEntry *e = QTAILQ_FIRST(&qov->stack); | |
141 | ||
142 | assert(e); | |
143 | if (e->is_list_head) { | |
144 | e->is_list_head = false; | |
145 | return list; | |
146 | } | |
147 | ||
148 | return list ? list->next : NULL; | |
e4e6aa14 MR |
149 | } |
150 | ||
151 | static void qmp_output_end_list(Visitor *v, Error **errp) | |
152 | { | |
153 | QmpOutputVisitor *qov = to_qov(v); | |
154 | qmp_output_pop(qov); | |
155 | } | |
156 | ||
157 | static void qmp_output_type_int(Visitor *v, int64_t *obj, const char *name, | |
158 | Error **errp) | |
159 | { | |
160 | QmpOutputVisitor *qov = to_qov(v); | |
161 | qmp_output_add(qov, name, qint_from_int(*obj)); | |
162 | } | |
163 | ||
164 | static void qmp_output_type_bool(Visitor *v, bool *obj, const char *name, | |
165 | Error **errp) | |
166 | { | |
167 | QmpOutputVisitor *qov = to_qov(v); | |
fc48ffc3 | 168 | qmp_output_add(qov, name, qbool_from_bool(*obj)); |
e4e6aa14 MR |
169 | } |
170 | ||
171 | static void qmp_output_type_str(Visitor *v, char **obj, const char *name, | |
172 | Error **errp) | |
173 | { | |
174 | QmpOutputVisitor *qov = to_qov(v); | |
175 | if (*obj) { | |
176 | qmp_output_add(qov, name, qstring_from_str(*obj)); | |
177 | } else { | |
178 | qmp_output_add(qov, name, qstring_from_str("")); | |
179 | } | |
180 | } | |
181 | ||
182 | static void qmp_output_type_number(Visitor *v, double *obj, const char *name, | |
183 | Error **errp) | |
184 | { | |
185 | QmpOutputVisitor *qov = to_qov(v); | |
186 | qmp_output_add(qov, name, qfloat_from_double(*obj)); | |
187 | } | |
188 | ||
e4e6aa14 MR |
189 | QObject *qmp_output_get_qobject(QmpOutputVisitor *qov) |
190 | { | |
191 | QObject *obj = qmp_output_first(qov); | |
192 | if (obj) { | |
193 | qobject_incref(obj); | |
194 | } | |
195 | return obj; | |
196 | } | |
197 | ||
198 | Visitor *qmp_output_get_visitor(QmpOutputVisitor *v) | |
199 | { | |
200 | return &v->visitor; | |
201 | } | |
202 | ||
203 | void qmp_output_visitor_cleanup(QmpOutputVisitor *v) | |
204 | { | |
205 | QStackEntry *e, *tmp; | |
206 | ||
f24582d6 LE |
207 | /* The bottom QStackEntry, if any, owns the root QObject. See the |
208 | * qmp_output_push_obj() invocations in qmp_output_add_obj(). */ | |
209 | QObject *root = QTAILQ_EMPTY(&v->stack) ? NULL : qmp_output_first(v); | |
210 | ||
e4e6aa14 MR |
211 | QTAILQ_FOREACH_SAFE(e, &v->stack, node, tmp) { |
212 | QTAILQ_REMOVE(&v->stack, e, node); | |
7267c094 | 213 | g_free(e); |
e4e6aa14 MR |
214 | } |
215 | ||
f24582d6 | 216 | qobject_decref(root); |
7267c094 | 217 | g_free(v); |
e4e6aa14 MR |
218 | } |
219 | ||
220 | QmpOutputVisitor *qmp_output_visitor_new(void) | |
221 | { | |
222 | QmpOutputVisitor *v; | |
223 | ||
7267c094 | 224 | v = g_malloc0(sizeof(*v)); |
e4e6aa14 MR |
225 | |
226 | v->visitor.start_struct = qmp_output_start_struct; | |
227 | v->visitor.end_struct = qmp_output_end_struct; | |
228 | v->visitor.start_list = qmp_output_start_list; | |
229 | v->visitor.next_list = qmp_output_next_list; | |
230 | v->visitor.end_list = qmp_output_end_list; | |
0f71a1e0 | 231 | v->visitor.type_enum = output_type_enum; |
e4e6aa14 MR |
232 | v->visitor.type_int = qmp_output_type_int; |
233 | v->visitor.type_bool = qmp_output_type_bool; | |
234 | v->visitor.type_str = qmp_output_type_str; | |
235 | v->visitor.type_number = qmp_output_type_number; | |
236 | ||
237 | QTAILQ_INIT(&v->stack); | |
238 | ||
239 | return v; | |
240 | } |