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, const char *name, size_t unused, Error **errp)
  55 {
  56     QapiDeallocVisitor *qov = to_qov(v);
  57     qapi_dealloc_push(qov, obj);
  58 }
  59
  60 static void qapi_dealloc_end_struct(Visitor *v, Error **errp)
  61 {
  62     QapiDeallocVisitor *qov = to_qov(v);
  63     void **obj = qapi_dealloc_pop(qov);
  64     if (obj) {
  65         qemu_free(*obj);
  66     }
  67 }
  68
  69 static void qapi_dealloc_start_list(Visitor *v, const char *name, Error **errp)
  70 {
  71 }
  72
  73 static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **list, Error **errp)
  74 {
  75     GenericList *retval = *list;
  76     qemu_free(retval->value);
  77     *list = retval->next;
  78     return retval;
  79 }
  80
  81 static void qapi_dealloc_end_list(Visitor *v, Error **errp)
  82 {
  83 }
  84
  85 static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name, Error **errp)
  86 {
  87     if (obj) {
  88         qemu_free(*obj);
  89     }
  90 }
  91
  92 static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
  93 {
  94 }
  95
  96 static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
  97 {
  98 }
  99
 100 static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name, Error **errp)
 101 {
 102 }
 103
 104 static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *kind, const char *name, Error **errp)
 105 {
 106 }
 107
 108 Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v)
 109 {
 110     return &v->visitor;
 111 }
 112
 113 void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v)
 114 {
 115     qemu_free(v);
 116 }
 117
 118 QapiDeallocVisitor *qapi_dealloc_visitor_new(void)
 119 {
 120     QapiDeallocVisitor *v;
 121
 122     v = qemu_mallocz(sizeof(*v));
 123
 124     v->visitor.start_struct = qapi_dealloc_start_struct;
 125     v->visitor.end_struct = qapi_dealloc_end_struct;
 126     v->visitor.start_list = qapi_dealloc_start_list;
 127     v->visitor.next_list = qapi_dealloc_next_list;
 128     v->visitor.end_list = qapi_dealloc_end_list;
 129     v->visitor.type_enum = qapi_dealloc_type_enum;
 130     v->visitor.type_int = qapi_dealloc_type_int;
 131     v->visitor.type_bool = qapi_dealloc_type_bool;
 132     v->visitor.type_str = qapi_dealloc_type_str;
 133     v->visitor.type_number = qapi_dealloc_type_number;
 134
 135     QTAILQ_INIT(&v->stack);
 136
 137     return v;
 138 }