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     QTAILQ_ENTRY(StackEntry) node;
  23 } StackEntry;
  24
  25 struct QapiDeallocVisitor
  26 {
  27     Visitor visitor;
  28     QTAILQ_HEAD(, StackEntry) stack;
  29 };
  30
  31 static QapiDeallocVisitor *to_qov(Visitor *v)
  32 {
  33     return container_of(v, QapiDeallocVisitor, visitor);
  34 }
  35
  36 static void qapi_dealloc_push(QapiDeallocVisitor *qov, void *value)
  37 {
  38     StackEntry *e = qemu_mallocz(sizeof(*e));
  39
  40     e->value = value;
  41     QTAILQ_INSERT_HEAD(&qov->stack, e, node);
  42 }
  43
  44 static void *qapi_dealloc_pop(QapiDeallocVisitor *qov)
  45 {
  46     StackEntry *e = QTAILQ_FIRST(&qov->stack);
  47     QObject *value;
  48     QTAILQ_REMOVE(&qov->stack, e, node);
  49     value = e->value;
  50     qemu_free(e);
  51     return value;
  52 }
  53
  54 static void qapi_dealloc_start_struct(Visitor *v, void **obj, const char *kind,
  55                                       const char *name, size_t unused,
  56                                       Error **errp)
  57 {
  58     QapiDeallocVisitor *qov = to_qov(v);
  59     qapi_dealloc_push(qov, obj);
  60 }
  61
  62 static void qapi_dealloc_end_struct(Visitor *v, Error **errp)
  63 {
  64     QapiDeallocVisitor *qov = to_qov(v);
  65     void **obj = qapi_dealloc_pop(qov);
  66     if (obj) {
  67         qemu_free(*obj);
  68     }
  69 }
  70
  71 static void qapi_dealloc_start_list(Visitor *v, const char *name, Error **errp)
  72 {
  73 }
  74
  75 static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **list,
  76                                            Error **errp)
  77 {
  78     GenericList *retval = *list;
  79     qemu_free(retval->value);
  80     *list = retval->next;
  81     return retval;
  82 }
  83
  84 static void qapi_dealloc_end_list(Visitor *v, Error **errp)
  85 {
  86 }
  87
  88 static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name,
  89                                   Error **errp)
  90 {
  91     if (obj) {
  92         qemu_free(*obj);
  93     }
  94 }
  95
  96 static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name,
  97                                   Error **errp)
  98 {
  99 }
 100
 101 static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name,
 102                                    Error **errp)
 103 {
 104 }
 105
 106 static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name,
 107                                      Error **errp)
 108 {
 109 }
 110
 111 static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *strings[],
 112                                    const char *kind, const char *name,
 113                                    Error **errp)
 114 {
 115 }
 116
 117 Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v)
 118 {
 119     return &v->visitor;
 120 }
 121
 122 void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v)
 123 {
 124     qemu_free(v);
 125 }
 126
 127 QapiDeallocVisitor *qapi_dealloc_visitor_new(void)
 128 {
 129     QapiDeallocVisitor *v;
 130
 131     v = qemu_mallocz(sizeof(*v));
 132
 133     v->visitor.start_struct = qapi_dealloc_start_struct;
 134     v->visitor.end_struct = qapi_dealloc_end_struct;
 135     v->visitor.start_list = qapi_dealloc_start_list;
 136     v->visitor.next_list = qapi_dealloc_next_list;
 137     v->visitor.end_list = qapi_dealloc_end_list;
 138     v->visitor.type_enum = qapi_dealloc_type_enum;
 139     v->visitor.type_int = qapi_dealloc_type_int;
 140     v->visitor.type_bool = qapi_dealloc_type_bool;
 141     v->visitor.type_str = qapi_dealloc_type_str;
 142     v->visitor.type_number = qapi_dealloc_type_number;
 143
 144     QTAILQ_INIT(&v->stack);
 145
 146     return v;
 147 }