1 /* 2 * Dealloc Visitor 3 * 4 * Copyright IBM, Corp. 2011 5 * 6 * Authors: 7 * Michael Roth <mdroth@linux.vnet.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 "qapi/dealloc-visitor.h" 15 #include "qemu/queue.h" 16 #include "qemu-common.h" 17 #include "qapi/qmp/types.h" 18 #include "qapi/visitor-impl.h" 19 20 typedef struct StackEntry 21 { 22 void *value; 23 bool is_list_head; 24 QTAILQ_ENTRY(StackEntry) node; 25 } StackEntry; 26 27 struct QapiDeallocVisitor 28 { 29 Visitor visitor; 30 QTAILQ_HEAD(, StackEntry) stack; 31 bool is_list_head; 32 }; 33 34 static QapiDeallocVisitor *to_qov(Visitor *v) 35 { 36 return container_of(v, QapiDeallocVisitor, visitor); 37 } 38 39 static void qapi_dealloc_push(QapiDeallocVisitor *qov, void *value) 40 { 41 StackEntry *e = g_malloc0(sizeof(*e)); 42 43 e->value = value; 44 45 /* see if we're just pushing a list head tracker */ 46 if (value == NULL) { 47 e->is_list_head = true; 48 } 49 QTAILQ_INSERT_HEAD(&qov->stack, e, node); 50 } 51 52 static void *qapi_dealloc_pop(QapiDeallocVisitor *qov) 53 { 54 StackEntry *e = QTAILQ_FIRST(&qov->stack); 55 QObject *value; 56 QTAILQ_REMOVE(&qov->stack, e, node); 57 value = e->value; 58 g_free(e); 59 return value; 60 } 61 62 static void qapi_dealloc_start_struct(Visitor *v, void **obj, const char *kind, 63 const char *name, size_t unused, 64 Error **errp) 65 { 66 QapiDeallocVisitor *qov = to_qov(v); 67 qapi_dealloc_push(qov, obj); 68 } 69 70 static void qapi_dealloc_end_struct(Visitor *v, Error **errp) 71 { 72 QapiDeallocVisitor *qov = to_qov(v); 73 void **obj = qapi_dealloc_pop(qov); 74 if (obj) { 75 g_free(*obj); 76 } 77 } 78 79 static void qapi_dealloc_start_implicit_struct(Visitor *v, 80 void **obj, 81 size_t size, 82 Error **errp) 83 { 84 QapiDeallocVisitor *qov = to_qov(v); 85 qapi_dealloc_push(qov, obj); 86 } 87 88 static void qapi_dealloc_end_implicit_struct(Visitor *v, Error **errp) 89 { 90 QapiDeallocVisitor *qov = to_qov(v); 91 void **obj = qapi_dealloc_pop(qov); 92 if (obj) { 93 g_free(*obj); 94 } 95 } 96 97 static void qapi_dealloc_start_list(Visitor *v, const char *name, Error **errp) 98 { 99 QapiDeallocVisitor *qov = to_qov(v); 100 qapi_dealloc_push(qov, NULL); 101 } 102 103 static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp, 104 Error **errp) 105 { 106 GenericList *list = *listp; 107 QapiDeallocVisitor *qov = to_qov(v); 108 StackEntry *e = QTAILQ_FIRST(&qov->stack); 109 110 if (e && e->is_list_head) { 111 e->is_list_head = false; 112 return list; 113 } 114 115 if (list) { 116 list = list->next; 117 g_free(*listp); 118 return list; 119 } 120 121 return NULL; 122 } 123 124 static void qapi_dealloc_end_list(Visitor *v, Error **errp) 125 { 126 QapiDeallocVisitor *qov = to_qov(v); 127 void *obj = qapi_dealloc_pop(qov); 128 assert(obj == NULL); /* should've been list head tracker with no payload */ 129 } 130 131 static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name, 132 Error **errp) 133 { 134 if (obj) { 135 g_free(*obj); 136 } 137 } 138 139 static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name, 140 Error **errp) 141 { 142 } 143 144 static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name, 145 Error **errp) 146 { 147 } 148 149 static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name, 150 Error **errp) 151 { 152 } 153 154 static void qapi_dealloc_type_size(Visitor *v, uint64_t *obj, const char *name, 155 Error **errp) 156 { 157 } 158 159 static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *strings[], 160 const char *kind, const char *name, 161 Error **errp) 162 { 163 } 164 165 Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v) 166 { 167 return &v->visitor; 168 } 169 170 void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v) 171 { 172 g_free(v); 173 } 174 175 QapiDeallocVisitor *qapi_dealloc_visitor_new(void) 176 { 177 QapiDeallocVisitor *v; 178 179 v = g_malloc0(sizeof(*v)); 180 181 v->visitor.start_struct = qapi_dealloc_start_struct; 182 v->visitor.end_struct = qapi_dealloc_end_struct; 183 v->visitor.start_implicit_struct = qapi_dealloc_start_implicit_struct; 184 v->visitor.end_implicit_struct = qapi_dealloc_end_implicit_struct; 185 v->visitor.start_list = qapi_dealloc_start_list; 186 v->visitor.next_list = qapi_dealloc_next_list; 187 v->visitor.end_list = qapi_dealloc_end_list; 188 v->visitor.type_enum = qapi_dealloc_type_enum; 189 v->visitor.type_int = qapi_dealloc_type_int; 190 v->visitor.type_bool = qapi_dealloc_type_bool; 191 v->visitor.type_str = qapi_dealloc_type_str; 192 v->visitor.type_number = qapi_dealloc_type_number; 193 v->visitor.type_size = qapi_dealloc_type_size; 194 195 QTAILQ_INIT(&v->stack); 196 197 return v; 198 } 199