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_list(Visitor *v, const char *name, Error **errp) 80 { 81 QapiDeallocVisitor *qov = to_qov(v); 82 qapi_dealloc_push(qov, NULL); 83 } 84 85 static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp, 86 Error **errp) 87 { 88 GenericList *list = *listp; 89 QapiDeallocVisitor *qov = to_qov(v); 90 StackEntry *e = QTAILQ_FIRST(&qov->stack); 91 92 if (e && e->is_list_head) { 93 e->is_list_head = false; 94 return list; 95 } 96 97 if (list) { 98 list = list->next; 99 g_free(*listp); 100 return list; 101 } 102 103 return NULL; 104 } 105 106 static void qapi_dealloc_end_list(Visitor *v, Error **errp) 107 { 108 QapiDeallocVisitor *qov = to_qov(v); 109 void *obj = qapi_dealloc_pop(qov); 110 assert(obj == NULL); /* should've been list head tracker with no payload */ 111 } 112 113 static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name, 114 Error **errp) 115 { 116 if (obj) { 117 g_free(*obj); 118 } 119 } 120 121 static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name, 122 Error **errp) 123 { 124 } 125 126 static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name, 127 Error **errp) 128 { 129 } 130 131 static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name, 132 Error **errp) 133 { 134 } 135 136 static void qapi_dealloc_type_size(Visitor *v, uint64_t *obj, const char *name, 137 Error **errp) 138 { 139 } 140 141 static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *strings[], 142 const char *kind, const char *name, 143 Error **errp) 144 { 145 } 146 147 Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v) 148 { 149 return &v->visitor; 150 } 151 152 void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v) 153 { 154 g_free(v); 155 } 156 157 QapiDeallocVisitor *qapi_dealloc_visitor_new(void) 158 { 159 QapiDeallocVisitor *v; 160 161 v = g_malloc0(sizeof(*v)); 162 163 v->visitor.start_struct = qapi_dealloc_start_struct; 164 v->visitor.end_struct = qapi_dealloc_end_struct; 165 v->visitor.start_list = qapi_dealloc_start_list; 166 v->visitor.next_list = qapi_dealloc_next_list; 167 v->visitor.end_list = qapi_dealloc_end_list; 168 v->visitor.type_enum = qapi_dealloc_type_enum; 169 v->visitor.type_int = qapi_dealloc_type_int; 170 v->visitor.type_bool = qapi_dealloc_type_bool; 171 v->visitor.type_str = qapi_dealloc_type_str; 172 v->visitor.type_number = qapi_dealloc_type_number; 173 v->visitor.type_size = qapi_dealloc_type_size; 174 175 QTAILQ_INIT(&v->stack); 176 177 return v; 178 } 179