1 /* 2 * Dealloc Visitor 3 * 4 * Copyright (C) 2012-2016 Red Hat, Inc. 5 * Copyright IBM, Corp. 2011 6 * 7 * Authors: 8 * Michael Roth <mdroth@linux.vnet.ibm.com> 9 * 10 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later. 11 * See the COPYING.LIB file in the top-level directory. 12 * 13 */ 14 15 #include "qemu/osdep.h" 16 #include "qapi/dealloc-visitor.h" 17 #include "qemu/queue.h" 18 #include "qemu-common.h" 19 #include "qapi/qmp/types.h" 20 #include "qapi/visitor-impl.h" 21 22 typedef struct StackEntry 23 { 24 void *value; 25 QTAILQ_ENTRY(StackEntry) node; 26 } StackEntry; 27 28 struct QapiDeallocVisitor 29 { 30 Visitor visitor; 31 QTAILQ_HEAD(, StackEntry) stack; 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 QTAILQ_INSERT_HEAD(&qov->stack, e, node); 46 } 47 48 static void *qapi_dealloc_pop(QapiDeallocVisitor *qov) 49 { 50 StackEntry *e = QTAILQ_FIRST(&qov->stack); 51 QObject *value; 52 QTAILQ_REMOVE(&qov->stack, e, node); 53 value = e->value; 54 g_free(e); 55 return value; 56 } 57 58 static void qapi_dealloc_start_struct(Visitor *v, const char *name, void **obj, 59 size_t unused, Error **errp) 60 { 61 QapiDeallocVisitor *qov = to_qov(v); 62 qapi_dealloc_push(qov, obj); 63 } 64 65 static void qapi_dealloc_end_struct(Visitor *v) 66 { 67 QapiDeallocVisitor *qov = to_qov(v); 68 void **obj = qapi_dealloc_pop(qov); 69 if (obj) { 70 g_free(*obj); 71 } 72 } 73 74 static void qapi_dealloc_start_alternate(Visitor *v, const char *name, 75 GenericAlternate **obj, size_t size, 76 bool promote_int, Error **errp) 77 { 78 QapiDeallocVisitor *qov = to_qov(v); 79 qapi_dealloc_push(qov, obj); 80 } 81 82 static void qapi_dealloc_end_alternate(Visitor *v) 83 { 84 QapiDeallocVisitor *qov = to_qov(v); 85 void **obj = qapi_dealloc_pop(qov); 86 if (obj) { 87 g_free(*obj); 88 } 89 } 90 91 static void qapi_dealloc_start_list(Visitor *v, const char *name, 92 GenericList **list, size_t size, 93 Error **errp) 94 { 95 } 96 97 static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList *tail, 98 size_t size) 99 { 100 GenericList *next = tail->next; 101 g_free(tail); 102 return next; 103 } 104 105 static void qapi_dealloc_end_list(Visitor *v) 106 { 107 } 108 109 static void qapi_dealloc_type_str(Visitor *v, const char *name, char **obj, 110 Error **errp) 111 { 112 if (obj) { 113 g_free(*obj); 114 } 115 } 116 117 static void qapi_dealloc_type_int64(Visitor *v, const char *name, int64_t *obj, 118 Error **errp) 119 { 120 } 121 122 static void qapi_dealloc_type_uint64(Visitor *v, const char *name, 123 uint64_t *obj, Error **errp) 124 { 125 } 126 127 static void qapi_dealloc_type_bool(Visitor *v, const char *name, bool *obj, 128 Error **errp) 129 { 130 } 131 132 static void qapi_dealloc_type_number(Visitor *v, const char *name, double *obj, 133 Error **errp) 134 { 135 } 136 137 static void qapi_dealloc_type_anything(Visitor *v, const char *name, 138 QObject **obj, Error **errp) 139 { 140 if (obj) { 141 qobject_decref(*obj); 142 } 143 } 144 145 static void qapi_dealloc_type_null(Visitor *v, const char *name, Error **errp) 146 { 147 } 148 149 Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v) 150 { 151 return &v->visitor; 152 } 153 154 void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v) 155 { 156 g_free(v); 157 } 158 159 QapiDeallocVisitor *qapi_dealloc_visitor_new(void) 160 { 161 QapiDeallocVisitor *v; 162 163 v = g_malloc0(sizeof(*v)); 164 165 v->visitor.type = VISITOR_DEALLOC; 166 v->visitor.start_struct = qapi_dealloc_start_struct; 167 v->visitor.end_struct = qapi_dealloc_end_struct; 168 v->visitor.start_alternate = qapi_dealloc_start_alternate; 169 v->visitor.end_alternate = qapi_dealloc_end_alternate; 170 v->visitor.start_list = qapi_dealloc_start_list; 171 v->visitor.next_list = qapi_dealloc_next_list; 172 v->visitor.end_list = qapi_dealloc_end_list; 173 v->visitor.type_int64 = qapi_dealloc_type_int64; 174 v->visitor.type_uint64 = qapi_dealloc_type_uint64; 175 v->visitor.type_bool = qapi_dealloc_type_bool; 176 v->visitor.type_str = qapi_dealloc_type_str; 177 v->visitor.type_number = qapi_dealloc_type_number; 178 v->visitor.type_any = qapi_dealloc_type_anything; 179 v->visitor.type_null = qapi_dealloc_type_null; 180 181 QTAILQ_INIT(&v->stack); 182 183 return v; 184 } 185