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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
19typedef struct StackEntry
20{
21 void *value;
0b9d8542 22 bool is_list_head;
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23 QTAILQ_ENTRY(StackEntry) node;
24} StackEntry;
25
26struct QapiDeallocVisitor
27{
28 Visitor visitor;
29 QTAILQ_HEAD(, StackEntry) stack;
5666dd19 30 bool is_list_head;
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31};
32
33static QapiDeallocVisitor *to_qov(Visitor *v)
34{
35 return container_of(v, QapiDeallocVisitor, visitor);
36}
37
38static void qapi_dealloc_push(QapiDeallocVisitor *qov, void *value)
39{
7267c094 40 StackEntry *e = g_malloc0(sizeof(*e));
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41
42 e->value = value;
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43
44 /* see if we're just pushing a list head tracker */
45 if (value == NULL) {
46 e->is_list_head = true;
47 }
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48 QTAILQ_INSERT_HEAD(&qov->stack, e, node);
49}
50
51static 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;
7267c094 57 g_free(e);
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58 return value;
59}
60
61static 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
69static 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) {
7267c094 74 g_free(*obj);
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75 }
76}
77
78static void qapi_dealloc_start_list(Visitor *v, const char *name, Error **errp)
79{
5666dd19 80 QapiDeallocVisitor *qov = to_qov(v);
0b9d8542 81 qapi_dealloc_push(qov, NULL);
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82}
83
5666dd19 84static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp,
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85 Error **errp)
86{
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87 GenericList *list = *listp;
88 QapiDeallocVisitor *qov = to_qov(v);
0b9d8542 89 StackEntry *e = QTAILQ_FIRST(&qov->stack);
5666dd19 90
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91 if (e && e->is_list_head) {
92 e->is_list_head = false;
93 return list;
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94 }
95
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96 if (list) {
97 list = list->next;
98 g_free(*listp);
99 return list;
100 }
101
102 return NULL;
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103}
104
105static void qapi_dealloc_end_list(Visitor *v, Error **errp)
106{
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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 */
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110}
111
112static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name,
113 Error **errp)
114{
115 if (obj) {
7267c094 116 g_free(*obj);
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117 }
118}
119
120static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name,
121 Error **errp)
122{
123}
124
125static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name,
126 Error **errp)
127{
128}
129
130static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name,
131 Error **errp)
132{
133}
134
135static 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
141Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v)
142{
143 return &v->visitor;
144}
145
146void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v)
147{
7267c094 148 g_free(v);
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149}
150
151QapiDeallocVisitor *qapi_dealloc_visitor_new(void)
152{
153 QapiDeallocVisitor *v;
154
7267c094 155 v = g_malloc0(sizeof(*v));
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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}