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/*

 * Dealloc Visitor

 *

 * Copyright IBM, Corp. 2011

 *

 * Authors:

 *  Michael Roth   <mdroth@linux.vnet.ibm.com>

 *

 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.

 * See the COPYING.LIB file in the top-level directory.

 *

 */

#include "qapi-dealloc-visitor.h"

#include "qemu-queue.h"

#include "qemu-common.h"

#include "qemu-objects.h"

typedef struct StackEntry

{

    void *value;

    bool is_list_head;

    QTAILQ_ENTRY(StackEntry) node;

} StackEntry;

struct QapiDeallocVisitor

{

    Visitor visitor;

    QTAILQ_HEAD(, StackEntry) stack;

    bool is_list_head;

};

static QapiDeallocVisitor *to_qov(Visitor *v)

{

    return container_of(v, QapiDeallocVisitor, visitor);

}

static void qapi_dealloc_push(QapiDeallocVisitor *qov, void *value)

{

    StackEntry *e = g_malloc0(sizeof(*e));

    e->value = value;

    /* see if we're just pushing a list head tracker */

    if (value == NULL) {

        e->is_list_head = true;

    }

    QTAILQ_INSERT_HEAD(&qov->stack, e, node);

}

static void *qapi_dealloc_pop(QapiDeallocVisitor *qov)

{

    StackEntry *e = QTAILQ_FIRST(&qov->stack);

    QObject *value;

    QTAILQ_REMOVE(&qov->stack, e, node);

    value = e->value;

    g_free(e);

    return value;

}

static void qapi_dealloc_start_struct(Visitor *v, void **obj, const char *kind,

                                      const char *name, size_t unused,

                                      Error **errp)

{

    QapiDeallocVisitor *qov = to_qov(v);

    qapi_dealloc_push(qov, obj);

}

static void qapi_dealloc_end_struct(Visitor *v, Error **errp)

{

    QapiDeallocVisitor *qov = to_qov(v);

    void **obj = qapi_dealloc_pop(qov);

    if (obj) {

        g_free(*obj);

    }

}

static void qapi_dealloc_start_list(Visitor *v, const char *name, Error **errp)

{

    QapiDeallocVisitor *qov = to_qov(v);

    qapi_dealloc_push(qov, NULL);

}

static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp,

                                           Error **errp)

{

    GenericList *list = *listp;

    QapiDeallocVisitor *qov = to_qov(v);

    StackEntry *e = QTAILQ_FIRST(&qov->stack);

    if (e && e->is_list_head) {

        e->is_list_head = false;

        return list;

    }

    if (list) {

        list = list->next;

        g_free(*listp);

        return list;

    }

    return NULL;

}

static void qapi_dealloc_end_list(Visitor *v, Error **errp)

{

    QapiDeallocVisitor *qov = to_qov(v);

    void *obj = qapi_dealloc_pop(qov);

    assert(obj == NULL); /* should've been list head tracker with no payload */

}

static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name,

                                  Error **errp)

{

    if (obj) {

        g_free(*obj);

    }

}

static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name,

                                  Error **errp)

{

}

static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name,

                                   Error **errp)

{

}

static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name,

                                     Error **errp)

{

}

static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *strings[],

                                   const char *kind, const char *name,

                                   Error **errp)

{

}

Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v)

{

    return &v->visitor;

}

void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v)

{

    g_free(v);

}

QapiDeallocVisitor *qapi_dealloc_visitor_new(void)

{

    QapiDeallocVisitor *v;

    v = g_malloc0(sizeof(*v));

    v->visitor.start_struct = qapi_dealloc_start_struct;

    v->visitor.end_struct = qapi_dealloc_end_struct;

    v->visitor.start_list = qapi_dealloc_start_list;

    v->visitor.next_list = qapi_dealloc_next_list;

    v->visitor.end_list = qapi_dealloc_end_list;

    v->visitor.type_enum = qapi_dealloc_type_enum;

    v->visitor.type_int = qapi_dealloc_type_int;

    v->visitor.type_bool = qapi_dealloc_type_bool;

    v->visitor.type_str = qapi_dealloc_type_str;

    v->visitor.type_number = qapi_dealloc_type_number;

    QTAILQ_INIT(&v->stack);

    return v;

}