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" |
| 15 | |
| 16 | struct QapiCloneVisitor { |
| 17 | Visitor visitor; |
| 18 | size_t depth; |
| 19 | }; |
| 20 | |
| 21 | static QapiCloneVisitor *to_qcv(Visitor *v) |
| 22 | { |
| 23 | return container_of(v, QapiCloneVisitor, visitor); |
| 24 | } |
| 25 | |
| 26 | static void qapi_clone_start_struct(Visitor *v, const char *name, void **obj, |
| 27 | size_t size, Error **errp) |
| 28 | { |
| 29 | QapiCloneVisitor *qcv = to_qcv(v); |
| 30 | |
| 31 | if (!obj) { |
| 32 | assert(qcv->depth); |
| 33 | /* Only possible when visiting an alternate's object |
| 34 | * branch. Nothing further to do here, since the earlier |
| 35 | * visit_start_alternate() already copied memory. */ |
| 36 | return; |
| 37 | } |
| 38 | |
| 39 | *obj = g_memdup(*obj, size); |
| 40 | qcv->depth++; |
| 41 | } |
| 42 | |
| 43 | static void qapi_clone_end(Visitor *v, void **obj) |
| 44 | { |
| 45 | QapiCloneVisitor *qcv = to_qcv(v); |
| 46 | |
| 47 | assert(qcv->depth); |
| 48 | if (obj) { |
| 49 | qcv->depth--; |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | static void qapi_clone_start_list(Visitor *v, const char *name, |
| 54 | GenericList **listp, size_t size, |
| 55 | Error **errp) |
| 56 | { |
| 57 | qapi_clone_start_struct(v, name, (void **)listp, size, errp); |
| 58 | } |
| 59 | |
| 60 | static GenericList *qapi_clone_next_list(Visitor *v, GenericList *tail, |
| 61 | size_t size) |
| 62 | { |
| 63 | QapiCloneVisitor *qcv = to_qcv(v); |
| 64 | |
| 65 | assert(qcv->depth); |
| 66 | /* Unshare the tail of the list cloned by g_memdup() */ |
| 67 | tail->next = g_memdup(tail->next, size); |
| 68 | return tail->next; |
| 69 | } |
| 70 | |
| 71 | static void qapi_clone_start_alternate(Visitor *v, const char *name, |
| 72 | GenericAlternate **obj, size_t size, |
| 73 | bool promote_int, Error **errp) |
| 74 | { |
| 75 | qapi_clone_start_struct(v, name, (void **)obj, size, errp); |
| 76 | } |
| 77 | |
| 78 | static void qapi_clone_type_int64(Visitor *v, const char *name, int64_t *obj, |
| 79 | Error **errp) |
| 80 | { |
| 81 | QapiCloneVisitor *qcv = to_qcv(v); |
| 82 | |
| 83 | assert(qcv->depth); |
| 84 | /* Value was already cloned by g_memdup() */ |
| 85 | } |
| 86 | |
| 87 | static void qapi_clone_type_uint64(Visitor *v, const char *name, |
| 88 | uint64_t *obj, Error **errp) |
| 89 | { |
| 90 | QapiCloneVisitor *qcv = to_qcv(v); |
| 91 | |
| 92 | assert(qcv->depth); |
| 93 | /* Value was already cloned by g_memdup() */ |
| 94 | } |
| 95 | |
| 96 | static void qapi_clone_type_bool(Visitor *v, const char *name, bool *obj, |
| 97 | Error **errp) |
| 98 | { |
| 99 | QapiCloneVisitor *qcv = to_qcv(v); |
| 100 | |
| 101 | assert(qcv->depth); |
| 102 | /* Value was already cloned by g_memdup() */ |
| 103 | } |
| 104 | |
| 105 | static void qapi_clone_type_str(Visitor *v, const char *name, char **obj, |
| 106 | Error **errp) |
| 107 | { |
| 108 | QapiCloneVisitor *qcv = to_qcv(v); |
| 109 | |
| 110 | assert(qcv->depth); |
| 111 | /* |
| 112 | * Pointer was already cloned by g_memdup; create fresh copy. |
Daniel P. Berrange | b3db211 | 2016-09-30 15:45:27 +0100 | [diff] [blame] | 113 | * Note that as long as qobject-output-visitor accepts NULL instead of |
Eric Blake | a15fcc3 | 2016-06-09 10:48:44 -0600 | [diff] [blame] | 114 | * "", then we must do likewise. However, we want to obey the |
| 115 | * input visitor semantics of never producing NULL when the empty |
| 116 | * string is intended. |
| 117 | */ |
| 118 | *obj = g_strdup(*obj ?: ""); |
| 119 | } |
| 120 | |
| 121 | static void qapi_clone_type_number(Visitor *v, const char *name, double *obj, |
| 122 | Error **errp) |
| 123 | { |
| 124 | QapiCloneVisitor *qcv = to_qcv(v); |
| 125 | |
| 126 | assert(qcv->depth); |
| 127 | /* Value was already cloned by g_memdup() */ |
| 128 | } |
| 129 | |
| 130 | static void qapi_clone_type_null(Visitor *v, const char *name, Error **errp) |
| 131 | { |
| 132 | QapiCloneVisitor *qcv = to_qcv(v); |
| 133 | |
| 134 | assert(qcv->depth); |
| 135 | /* Nothing to do */ |
| 136 | } |
| 137 | |
| 138 | static void qapi_clone_free(Visitor *v) |
| 139 | { |
| 140 | g_free(v); |
| 141 | } |
| 142 | |
| 143 | static Visitor *qapi_clone_visitor_new(void) |
| 144 | { |
| 145 | QapiCloneVisitor *v; |
| 146 | |
| 147 | v = g_malloc0(sizeof(*v)); |
| 148 | |
| 149 | v->visitor.type = VISITOR_CLONE; |
| 150 | v->visitor.start_struct = qapi_clone_start_struct; |
| 151 | v->visitor.end_struct = qapi_clone_end; |
| 152 | v->visitor.start_list = qapi_clone_start_list; |
| 153 | v->visitor.next_list = qapi_clone_next_list; |
| 154 | v->visitor.end_list = qapi_clone_end; |
| 155 | v->visitor.start_alternate = qapi_clone_start_alternate; |
| 156 | v->visitor.end_alternate = qapi_clone_end; |
| 157 | v->visitor.type_int64 = qapi_clone_type_int64; |
| 158 | v->visitor.type_uint64 = qapi_clone_type_uint64; |
| 159 | v->visitor.type_bool = qapi_clone_type_bool; |
| 160 | v->visitor.type_str = qapi_clone_type_str; |
| 161 | v->visitor.type_number = qapi_clone_type_number; |
| 162 | v->visitor.type_null = qapi_clone_type_null; |
| 163 | v->visitor.free = qapi_clone_free; |
| 164 | |
| 165 | return &v->visitor; |
| 166 | } |
| 167 | |
| 168 | void *qapi_clone(const void *src, void (*visit_type)(Visitor *, const char *, |
| 169 | void **, Error **)) |
| 170 | { |
| 171 | Visitor *v; |
| 172 | void *dst = (void *) src; /* Cast away const */ |
| 173 | |
| 174 | if (!src) { |
| 175 | return NULL; |
| 176 | } |
| 177 | |
| 178 | v = qapi_clone_visitor_new(); |
| 179 | visit_type(v, NULL, &dst, &error_abort); |
| 180 | visit_free(v); |
| 181 | return dst; |
| 182 | } |