Eric Blake | a15fcc3 | 2016-06-09 10:48:44 -0600 | [diff] [blame] | 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" |
Max Reitz | 84be629 | 2017-11-14 19:01:23 +0100 | [diff] [blame] | 15 | #include "qapi/qmp/qnull.h" |
Eric Blake | a15fcc3 | 2016-06-09 10:48:44 -0600 | [diff] [blame] | 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 void 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; |
| 38 | } |
| 39 | |
| 40 | *obj = g_memdup(*obj, size); |
| 41 | qcv->depth++; |
| 42 | } |
| 43 | |
| 44 | static void qapi_clone_end(Visitor *v, void **obj) |
| 45 | { |
| 46 | QapiCloneVisitor *qcv = to_qcv(v); |
| 47 | |
| 48 | assert(qcv->depth); |
| 49 | if (obj) { |
| 50 | qcv->depth--; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | static void qapi_clone_start_list(Visitor *v, const char *name, |
| 55 | GenericList **listp, size_t size, |
| 56 | Error **errp) |
| 57 | { |
| 58 | qapi_clone_start_struct(v, name, (void **)listp, size, errp); |
| 59 | } |
| 60 | |
| 61 | static GenericList *qapi_clone_next_list(Visitor *v, GenericList *tail, |
| 62 | size_t size) |
| 63 | { |
| 64 | QapiCloneVisitor *qcv = to_qcv(v); |
| 65 | |
| 66 | assert(qcv->depth); |
| 67 | /* Unshare the tail of the list cloned by g_memdup() */ |
| 68 | tail->next = g_memdup(tail->next, size); |
| 69 | return tail->next; |
| 70 | } |
| 71 | |
| 72 | static void qapi_clone_start_alternate(Visitor *v, const char *name, |
| 73 | GenericAlternate **obj, size_t size, |
Marc-André Lureau | 60390d2 | 2017-06-07 20:35:59 +0400 | [diff] [blame] | 74 | Error **errp) |
Eric Blake | a15fcc3 | 2016-06-09 10:48:44 -0600 | [diff] [blame] | 75 | { |
| 76 | qapi_clone_start_struct(v, name, (void **)obj, size, errp); |
| 77 | } |
| 78 | |
| 79 | static void qapi_clone_type_int64(Visitor *v, const char *name, int64_t *obj, |
| 80 | Error **errp) |
| 81 | { |
| 82 | QapiCloneVisitor *qcv = to_qcv(v); |
| 83 | |
| 84 | assert(qcv->depth); |
| 85 | /* Value was already cloned by g_memdup() */ |
| 86 | } |
| 87 | |
| 88 | static void qapi_clone_type_uint64(Visitor *v, const char *name, |
| 89 | uint64_t *obj, Error **errp) |
| 90 | { |
| 91 | QapiCloneVisitor *qcv = to_qcv(v); |
| 92 | |
| 93 | assert(qcv->depth); |
| 94 | /* Value was already cloned by g_memdup() */ |
| 95 | } |
| 96 | |
| 97 | static void qapi_clone_type_bool(Visitor *v, const char *name, bool *obj, |
| 98 | Error **errp) |
| 99 | { |
| 100 | QapiCloneVisitor *qcv = to_qcv(v); |
| 101 | |
| 102 | assert(qcv->depth); |
| 103 | /* Value was already cloned by g_memdup() */ |
| 104 | } |
| 105 | |
| 106 | static void qapi_clone_type_str(Visitor *v, const char *name, char **obj, |
| 107 | Error **errp) |
| 108 | { |
| 109 | QapiCloneVisitor *qcv = to_qcv(v); |
| 110 | |
| 111 | assert(qcv->depth); |
| 112 | /* |
| 113 | * Pointer was already cloned by g_memdup; create fresh copy. |
Daniel P. Berrange | b3db211 | 2016-09-30 15:45:27 +0100 | [diff] [blame] | 114 | * Note that as long as qobject-output-visitor accepts NULL instead of |
Eric Blake | a15fcc3 | 2016-06-09 10:48:44 -0600 | [diff] [blame] | 115 | * "", then we must do likewise. However, we want to obey the |
| 116 | * input visitor semantics of never producing NULL when the empty |
| 117 | * string is intended. |
| 118 | */ |
| 119 | *obj = g_strdup(*obj ?: ""); |
| 120 | } |
| 121 | |
| 122 | static void qapi_clone_type_number(Visitor *v, const char *name, double *obj, |
| 123 | Error **errp) |
| 124 | { |
| 125 | QapiCloneVisitor *qcv = to_qcv(v); |
| 126 | |
| 127 | assert(qcv->depth); |
| 128 | /* Value was already cloned by g_memdup() */ |
| 129 | } |
| 130 | |
Markus Armbruster | d2f95f4 | 2017-06-26 18:22:59 +0200 | [diff] [blame] | 131 | static void qapi_clone_type_null(Visitor *v, const char *name, QNull **obj, |
| 132 | Error **errp) |
Eric Blake | a15fcc3 | 2016-06-09 10:48:44 -0600 | [diff] [blame] | 133 | { |
| 134 | QapiCloneVisitor *qcv = to_qcv(v); |
| 135 | |
| 136 | assert(qcv->depth); |
Markus Armbruster | d2f95f4 | 2017-06-26 18:22:59 +0200 | [diff] [blame] | 137 | *obj = qnull(); |
Eric Blake | a15fcc3 | 2016-06-09 10:48:44 -0600 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static void qapi_clone_free(Visitor *v) |
| 141 | { |
| 142 | g_free(v); |
| 143 | } |
| 144 | |
| 145 | static Visitor *qapi_clone_visitor_new(void) |
| 146 | { |
| 147 | QapiCloneVisitor *v; |
| 148 | |
| 149 | v = g_malloc0(sizeof(*v)); |
| 150 | |
| 151 | v->visitor.type = VISITOR_CLONE; |
| 152 | v->visitor.start_struct = qapi_clone_start_struct; |
| 153 | v->visitor.end_struct = qapi_clone_end; |
| 154 | v->visitor.start_list = qapi_clone_start_list; |
| 155 | v->visitor.next_list = qapi_clone_next_list; |
| 156 | v->visitor.end_list = qapi_clone_end; |
| 157 | v->visitor.start_alternate = qapi_clone_start_alternate; |
| 158 | v->visitor.end_alternate = qapi_clone_end; |
| 159 | v->visitor.type_int64 = qapi_clone_type_int64; |
| 160 | v->visitor.type_uint64 = qapi_clone_type_uint64; |
| 161 | v->visitor.type_bool = qapi_clone_type_bool; |
| 162 | v->visitor.type_str = qapi_clone_type_str; |
| 163 | v->visitor.type_number = qapi_clone_type_number; |
| 164 | v->visitor.type_null = qapi_clone_type_null; |
| 165 | v->visitor.free = qapi_clone_free; |
| 166 | |
| 167 | return &v->visitor; |
| 168 | } |
| 169 | |
| 170 | void *qapi_clone(const void *src, void (*visit_type)(Visitor *, const char *, |
| 171 | void **, Error **)) |
| 172 | { |
| 173 | Visitor *v; |
| 174 | void *dst = (void *) src; /* Cast away const */ |
| 175 | |
| 176 | if (!src) { |
| 177 | return NULL; |
| 178 | } |
| 179 | |
| 180 | v = qapi_clone_visitor_new(); |
| 181 | visit_type(v, NULL, &dst, &error_abort); |
| 182 | visit_free(v); |
| 183 | return dst; |
| 184 | } |
Markus Armbruster | 4626a19 | 2017-04-26 09:36:38 +0200 | [diff] [blame] | 185 | |
| 186 | void qapi_clone_members(void *dst, const void *src, size_t sz, |
| 187 | void (*visit_type_members)(Visitor *, void *, |
| 188 | Error **)) |
| 189 | { |
| 190 | Visitor *v; |
| 191 | |
| 192 | v = qapi_clone_visitor_new(); |
| 193 | memcpy(dst, src, sz); |
| 194 | to_qcv(v)->depth++; |
| 195 | visit_type_members(v, dst, &error_abort); |
| 196 | visit_free(v); |
| 197 | } |