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![Markus Armbruster](/assets/img/avatar_default.png)
It's first class, because unlike '**', it actually works, i.e. doesn't require 'gen': false. '**' will go away next. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
235 lines
6.4 KiB
C
235 lines
6.4 KiB
C
/*
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* Dealloc Visitor
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Michael Roth <mdroth@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qapi/dealloc-visitor.h"
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#include "qemu/queue.h"
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#include "qemu-common.h"
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#include "qapi/qmp/types.h"
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#include "qapi/visitor-impl.h"
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typedef struct StackEntry
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{
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void *value;
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bool is_list_head;
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QTAILQ_ENTRY(StackEntry) node;
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} StackEntry;
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struct QapiDeallocVisitor
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{
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Visitor visitor;
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QTAILQ_HEAD(, StackEntry) stack;
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bool is_list_head;
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};
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static QapiDeallocVisitor *to_qov(Visitor *v)
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{
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return container_of(v, QapiDeallocVisitor, visitor);
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}
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static void qapi_dealloc_push(QapiDeallocVisitor *qov, void *value)
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{
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StackEntry *e = g_malloc0(sizeof(*e));
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e->value = value;
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/* see if we're just pushing a list head tracker */
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if (value == NULL) {
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e->is_list_head = true;
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}
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QTAILQ_INSERT_HEAD(&qov->stack, e, node);
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}
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static void *qapi_dealloc_pop(QapiDeallocVisitor *qov)
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{
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StackEntry *e = QTAILQ_FIRST(&qov->stack);
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QObject *value;
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QTAILQ_REMOVE(&qov->stack, e, node);
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value = e->value;
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g_free(e);
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return value;
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}
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static void qapi_dealloc_start_struct(Visitor *v, void **obj, const char *kind,
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const char *name, size_t unused,
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Error **errp)
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{
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QapiDeallocVisitor *qov = to_qov(v);
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qapi_dealloc_push(qov, obj);
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}
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static void qapi_dealloc_end_struct(Visitor *v, Error **errp)
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{
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QapiDeallocVisitor *qov = to_qov(v);
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void **obj = qapi_dealloc_pop(qov);
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if (obj) {
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g_free(*obj);
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}
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}
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static void qapi_dealloc_start_implicit_struct(Visitor *v,
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void **obj,
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size_t size,
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Error **errp)
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{
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QapiDeallocVisitor *qov = to_qov(v);
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qapi_dealloc_push(qov, obj);
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}
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static void qapi_dealloc_end_implicit_struct(Visitor *v, Error **errp)
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{
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QapiDeallocVisitor *qov = to_qov(v);
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void **obj = qapi_dealloc_pop(qov);
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if (obj) {
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g_free(*obj);
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}
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}
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static void qapi_dealloc_start_list(Visitor *v, const char *name, Error **errp)
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{
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QapiDeallocVisitor *qov = to_qov(v);
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qapi_dealloc_push(qov, NULL);
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}
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static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp,
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Error **errp)
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{
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GenericList *list = *listp;
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QapiDeallocVisitor *qov = to_qov(v);
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StackEntry *e = QTAILQ_FIRST(&qov->stack);
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if (e && e->is_list_head) {
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e->is_list_head = false;
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return list;
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}
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if (list) {
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list = list->next;
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g_free(*listp);
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return list;
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}
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return NULL;
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}
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static void qapi_dealloc_end_list(Visitor *v, Error **errp)
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{
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QapiDeallocVisitor *qov = to_qov(v);
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void *obj = qapi_dealloc_pop(qov);
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assert(obj == NULL); /* should've been list head tracker with no payload */
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}
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static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name,
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Error **errp)
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{
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if (obj) {
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g_free(*obj);
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}
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}
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static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name,
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Error **errp)
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{
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}
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static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name,
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Error **errp)
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{
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}
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static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name,
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Error **errp)
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{
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}
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static void qapi_dealloc_type_anything(Visitor *v, QObject **obj,
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const char *name, Error **errp)
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{
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if (obj) {
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qobject_decref(*obj);
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}
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}
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static void qapi_dealloc_type_size(Visitor *v, uint64_t *obj, const char *name,
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Error **errp)
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{
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}
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static void qapi_dealloc_type_enum(Visitor *v, int *obj,
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const char * const strings[],
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const char *kind, const char *name,
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Error **errp)
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{
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}
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/* If there's no data present, the dealloc visitor has nothing to free.
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* Thus, indicate to visitor code that the subsequent union fields can
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* be skipped. This is not an error condition, since the cleanup of the
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* rest of an object can continue unhindered, so leave errp unset in
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* these cases.
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*
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* NOTE: In cases where we're attempting to deallocate an object that
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* may have missing fields, the field indicating the union type may
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* be missing. In such a case, it's possible we don't have enough
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* information to differentiate data_present == false from a case where
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* data *is* present but happens to be a scalar with a value of 0.
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* This is okay, since in the case of the dealloc visitor there's no
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* work that needs to done in either situation.
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*
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* The current inability in QAPI code to more thoroughly verify a union
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* type in such cases will likely need to be addressed if we wish to
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* implement this interface for other types of visitors in the future,
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* however.
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*/
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static bool qapi_dealloc_start_union(Visitor *v, bool data_present,
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Error **errp)
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{
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return data_present;
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}
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Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v)
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{
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return &v->visitor;
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}
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void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v)
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{
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g_free(v);
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}
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QapiDeallocVisitor *qapi_dealloc_visitor_new(void)
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{
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QapiDeallocVisitor *v;
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v = g_malloc0(sizeof(*v));
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v->visitor.start_struct = qapi_dealloc_start_struct;
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v->visitor.end_struct = qapi_dealloc_end_struct;
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v->visitor.start_implicit_struct = qapi_dealloc_start_implicit_struct;
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v->visitor.end_implicit_struct = qapi_dealloc_end_implicit_struct;
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v->visitor.start_list = qapi_dealloc_start_list;
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v->visitor.next_list = qapi_dealloc_next_list;
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v->visitor.end_list = qapi_dealloc_end_list;
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v->visitor.type_enum = qapi_dealloc_type_enum;
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v->visitor.type_int = qapi_dealloc_type_int;
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v->visitor.type_bool = qapi_dealloc_type_bool;
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v->visitor.type_str = qapi_dealloc_type_str;
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v->visitor.type_number = qapi_dealloc_type_number;
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v->visitor.type_any = qapi_dealloc_type_anything;
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v->visitor.type_size = qapi_dealloc_type_size;
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v->visitor.start_union = qapi_dealloc_start_union;
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QTAILQ_INIT(&v->stack);
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return v;
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}
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