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 "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 }