qapi/qapi-dealloc-visitor.c

   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 "qemu-objects.h"
  18
  19 typedef struct StackEntry
  20 {
  21     void *value;
  22     bool is_list_head;
  23     QTAILQ_ENTRY(StackEntry) node;
  24 } StackEntry;
  25
  26 struct QapiDeallocVisitor
  27 {
  28     Visitor visitor;
  29     QTAILQ_HEAD(, StackEntry) stack;
  30     bool is_list_head;
  31 };
  32
  33 static QapiDeallocVisitor *to_qov(Visitor *v)
  34 {
  35     return container_of(v, QapiDeallocVisitor, visitor);
  36 }
  37
  38 static void qapi_dealloc_push(QapiDeallocVisitor *qov, void *value)
  39 {
  40     StackEntry *e = g_malloc0(sizeof(*e));
  41
  42     e->value = value;
  43
  44     /* see if we're just pushing a list head tracker */
  45     if (value == NULL) {
  46         e->is_list_head = true;
  47     }
  48     QTAILQ_INSERT_HEAD(&qov->stack, e, node);
  49 }
  50
  51 static void *qapi_dealloc_pop(QapiDeallocVisitor *qov)
  52 {
  53     StackEntry *e = QTAILQ_FIRST(&qov->stack);
  54     QObject *value;
  55     QTAILQ_REMOVE(&qov->stack, e, node);
  56     value = e->value;
  57     g_free(e);
  58     return value;
  59 }
  60
  61 static void qapi_dealloc_start_struct(Visitor *v, void **obj, const char *kind,
  62                                       const char *name, size_t unused,
  63                                       Error **errp)
  64 {
  65     QapiDeallocVisitor *qov = to_qov(v);
  66     qapi_dealloc_push(qov, obj);
  67 }
  68
  69 static void qapi_dealloc_end_struct(Visitor *v, Error **errp)
  70 {
  71     QapiDeallocVisitor *qov = to_qov(v);
  72     void **obj = qapi_dealloc_pop(qov);
  73     if (obj) {
  74         g_free(*obj);
  75     }
  76 }
  77
  78 static void qapi_dealloc_start_list(Visitor *v, const char *name, Error **errp)
  79 {
  80     QapiDeallocVisitor *qov = to_qov(v);
  81     qapi_dealloc_push(qov, NULL);
  82 }
  83
  84 static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp,
  85                                            Error **errp)
  86 {
  87     GenericList *list = *listp;
  88     QapiDeallocVisitor *qov = to_qov(v);
  89     StackEntry *e = QTAILQ_FIRST(&qov->stack);
  90
  91     if (e && e->is_list_head) {
  92         e->is_list_head = false;
  93         return list;
  94     }
  95
  96     if (list) {
  97         list = list->next;
  98         g_free(*listp);
  99         return list;
 100     }
 101
 102     return NULL;
 103 }
 104
 105 static void qapi_dealloc_end_list(Visitor *v, Error **errp)
 106 {
 107     QapiDeallocVisitor *qov = to_qov(v);
 108     void *obj = qapi_dealloc_pop(qov);
 109     assert(obj == NULL); /* should've been list head tracker with no payload */
 110 }
 111
 112 static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name,
 113                                   Error **errp)
 114 {
 115     if (obj) {
 116         g_free(*obj);
 117     }
 118 }
 119
 120 static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name,
 121                                   Error **errp)
 122 {
 123 }
 124
 125 static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name,
 126                                    Error **errp)
 127 {
 128 }
 129
 130 static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name,
 131                                      Error **errp)
 132 {
 133 }
 134
 135 static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *strings[],
 136                                    const char *kind, const char *name,
 137                                    Error **errp)
 138 {
 139 }
 140
 141 Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v)
 142 {
 143     return &v->visitor;
 144 }
 145
 146 void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v)
 147 {
 148     g_free(v);
 149 }
 150
 151 QapiDeallocVisitor *qapi_dealloc_visitor_new(void)
 152 {
 153     QapiDeallocVisitor *v;
 154
 155     v = g_malloc0(sizeof(*v));
 156
 157     v->visitor.start_struct = qapi_dealloc_start_struct;
 158     v->visitor.end_struct = qapi_dealloc_end_struct;
 159     v->visitor.start_list = qapi_dealloc_start_list;
 160     v->visitor.next_list = qapi_dealloc_next_list;
 161     v->visitor.end_list = qapi_dealloc_end_list;
 162     v->visitor.type_enum = qapi_dealloc_type_enum;
 163     v->visitor.type_int = qapi_dealloc_type_int;
 164     v->visitor.type_bool = qapi_dealloc_type_bool;
 165     v->visitor.type_str = qapi_dealloc_type_str;
 166     v->visitor.type_number = qapi_dealloc_type_number;
 167
 168     QTAILQ_INIT(&v->stack);
 169
 170     return v;
 171 }