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Commit | Line | Data |
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1 | /* | |
2 | * Copy one QAPI object to another | |
3 | * | |
4 | * Copyright (C) 2016 Red Hat, Inc. | |
5 | * | |
6 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
7 | * See the COPYING file in the top-level directory. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include "qemu/osdep.h" | |
12 | #include "qapi/clone-visitor.h" | |
13 | #include "qapi/visitor-impl.h" | |
14 | #include "qapi/error.h" | |
15 | #include "qapi/qmp/qnull.h" | |
16 | ||
17 | struct QapiCloneVisitor { | |
18 | Visitor visitor; | |
19 | size_t depth; | |
20 | }; | |
21 | ||
22 | static QapiCloneVisitor *to_qcv(Visitor *v) | |
23 | { | |
24 | return container_of(v, QapiCloneVisitor, visitor); | |
25 | } | |
26 | ||
27 | static bool qapi_clone_start_struct(Visitor *v, const char *name, void **obj, | |
28 | size_t size, Error **errp) | |
29 | { | |
30 | QapiCloneVisitor *qcv = to_qcv(v); | |
31 | ||
32 | if (!obj) { | |
33 | assert(qcv->depth); | |
34 | /* Only possible when visiting an alternate's object | |
35 | * branch. Nothing further to do here, since the earlier | |
36 | * visit_start_alternate() already copied memory. */ | |
37 | return true; | |
38 | } | |
39 | ||
40 | *obj = g_memdup(*obj, size); | |
41 | qcv->depth++; | |
42 | return true; | |
43 | } | |
44 | ||
45 | static void qapi_clone_end(Visitor *v, void **obj) | |
46 | { | |
47 | QapiCloneVisitor *qcv = to_qcv(v); | |
48 | ||
49 | assert(qcv->depth); | |
50 | if (obj) { | |
51 | qcv->depth--; | |
52 | } | |
53 | } | |
54 | ||
55 | static bool qapi_clone_start_list(Visitor *v, const char *name, | |
56 | GenericList **listp, size_t size, | |
57 | Error **errp) | |
58 | { | |
59 | return qapi_clone_start_struct(v, name, (void **)listp, size, errp); | |
60 | } | |
61 | ||
62 | static GenericList *qapi_clone_next_list(Visitor *v, GenericList *tail, | |
63 | size_t size) | |
64 | { | |
65 | QapiCloneVisitor *qcv = to_qcv(v); | |
66 | ||
67 | assert(qcv->depth); | |
68 | /* Unshare the tail of the list cloned by g_memdup() */ | |
69 | tail->next = g_memdup(tail->next, size); | |
70 | return tail->next; | |
71 | } | |
72 | ||
73 | static bool qapi_clone_start_alternate(Visitor *v, const char *name, | |
74 | GenericAlternate **obj, size_t size, | |
75 | Error **errp) | |
76 | { | |
77 | return qapi_clone_start_struct(v, name, (void **)obj, size, errp); | |
78 | } | |
79 | ||
80 | static bool qapi_clone_type_int64(Visitor *v, const char *name, int64_t *obj, | |
81 | Error **errp) | |
82 | { | |
83 | QapiCloneVisitor *qcv = to_qcv(v); | |
84 | ||
85 | assert(qcv->depth); | |
86 | /* Value was already cloned by g_memdup() */ | |
87 | return true; | |
88 | } | |
89 | ||
90 | static bool qapi_clone_type_uint64(Visitor *v, const char *name, | |
91 | uint64_t *obj, Error **errp) | |
92 | { | |
93 | QapiCloneVisitor *qcv = to_qcv(v); | |
94 | ||
95 | assert(qcv->depth); | |
96 | /* Value was already cloned by g_memdup() */ | |
97 | return true; | |
98 | } | |
99 | ||
100 | static bool qapi_clone_type_bool(Visitor *v, const char *name, bool *obj, | |
101 | Error **errp) | |
102 | { | |
103 | QapiCloneVisitor *qcv = to_qcv(v); | |
104 | ||
105 | assert(qcv->depth); | |
106 | /* Value was already cloned by g_memdup() */ | |
107 | return true; | |
108 | } | |
109 | ||
110 | static bool qapi_clone_type_str(Visitor *v, const char *name, char **obj, | |
111 | Error **errp) | |
112 | { | |
113 | QapiCloneVisitor *qcv = to_qcv(v); | |
114 | ||
115 | assert(qcv->depth); | |
116 | /* | |
117 | * Pointer was already cloned by g_memdup; create fresh copy. | |
118 | * Note that as long as qobject-output-visitor accepts NULL instead of | |
119 | * "", then we must do likewise. However, we want to obey the | |
120 | * input visitor semantics of never producing NULL when the empty | |
121 | * string is intended. | |
122 | */ | |
123 | *obj = g_strdup(*obj ?: ""); | |
124 | return true; | |
125 | } | |
126 | ||
127 | static bool qapi_clone_type_number(Visitor *v, const char *name, double *obj, | |
128 | Error **errp) | |
129 | { | |
130 | QapiCloneVisitor *qcv = to_qcv(v); | |
131 | ||
132 | assert(qcv->depth); | |
133 | /* Value was already cloned by g_memdup() */ | |
134 | return true; | |
135 | } | |
136 | ||
137 | static bool qapi_clone_type_null(Visitor *v, const char *name, QNull **obj, | |
138 | Error **errp) | |
139 | { | |
140 | QapiCloneVisitor *qcv = to_qcv(v); | |
141 | ||
142 | assert(qcv->depth); | |
143 | *obj = qnull(); | |
144 | return true; | |
145 | } | |
146 | ||
147 | static void qapi_clone_free(Visitor *v) | |
148 | { | |
149 | g_free(v); | |
150 | } | |
151 | ||
152 | static Visitor *qapi_clone_visitor_new(void) | |
153 | { | |
154 | QapiCloneVisitor *v; | |
155 | ||
156 | v = g_malloc0(sizeof(*v)); | |
157 | ||
158 | v->visitor.type = VISITOR_CLONE; | |
159 | v->visitor.start_struct = qapi_clone_start_struct; | |
160 | v->visitor.end_struct = qapi_clone_end; | |
161 | v->visitor.start_list = qapi_clone_start_list; | |
162 | v->visitor.next_list = qapi_clone_next_list; | |
163 | v->visitor.end_list = qapi_clone_end; | |
164 | v->visitor.start_alternate = qapi_clone_start_alternate; | |
165 | v->visitor.end_alternate = qapi_clone_end; | |
166 | v->visitor.type_int64 = qapi_clone_type_int64; | |
167 | v->visitor.type_uint64 = qapi_clone_type_uint64; | |
168 | v->visitor.type_bool = qapi_clone_type_bool; | |
169 | v->visitor.type_str = qapi_clone_type_str; | |
170 | v->visitor.type_number = qapi_clone_type_number; | |
171 | v->visitor.type_null = qapi_clone_type_null; | |
172 | v->visitor.free = qapi_clone_free; | |
173 | ||
174 | return &v->visitor; | |
175 | } | |
176 | ||
177 | void *qapi_clone(const void *src, bool (*visit_type)(Visitor *, const char *, | |
178 | void **, Error **)) | |
179 | { | |
180 | Visitor *v; | |
181 | void *dst = (void *) src; /* Cast away const */ | |
182 | ||
183 | if (!src) { | |
184 | return NULL; | |
185 | } | |
186 | ||
187 | v = qapi_clone_visitor_new(); | |
188 | visit_type(v, NULL, &dst, &error_abort); | |
189 | visit_free(v); | |
190 | return dst; | |
191 | } | |
192 | ||
193 | void qapi_clone_members(void *dst, const void *src, size_t sz, | |
194 | bool (*visit_type_members)(Visitor *, void *, | |
195 | Error **)) | |
196 | { | |
197 | Visitor *v; | |
198 | ||
199 | v = qapi_clone_visitor_new(); | |
200 | memcpy(dst, src, sz); | |
201 | to_qcv(v)->depth++; | |
202 | visit_type_members(v, dst, &error_abort); | |
203 | visit_free(v); | |
204 | } |