mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-01 07:21:09 +00:00
d2f95f4d48
Make visit_type_null() take an @obj argument like its buddies. This helps keep the next commit simple. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
/*
|
|
* Core Definitions for QAPI Visitor implementations
|
|
*
|
|
* Copyright (C) 2012-2016 Red Hat, Inc.
|
|
*
|
|
* Author: Paolo Bonizni <pbonzini@redhat.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.
|
|
*
|
|
*/
|
|
#ifndef QAPI_VISITOR_IMPL_H
|
|
#define QAPI_VISITOR_IMPL_H
|
|
|
|
#include "qapi/visitor.h"
|
|
|
|
/*
|
|
* This file describes the callback interface for implementing a QAPI
|
|
* visitor. For the client interface, see visitor.h. When
|
|
* implementing the callbacks, it is easiest to declare a struct with
|
|
* 'Visitor visitor;' as the first member. A callback's contract
|
|
* matches the corresponding public functions' contract unless stated
|
|
* otherwise. In the comments below, some callbacks are marked "must
|
|
* be set for $TYPE visits to work"; if a visitor implementation omits
|
|
* that callback, it should also document that it is only useful for a
|
|
* subset of QAPI.
|
|
*/
|
|
|
|
/*
|
|
* There are four classes of visitors; setting the class determines
|
|
* how QAPI enums are visited, as well as what additional restrictions
|
|
* can be asserted. The values are intentionally chosen so as to
|
|
* permit some assertions based on whether a given bit is set (that
|
|
* is, some assertions apply to input and clone visitors, some
|
|
* assertions apply to output and clone visitors).
|
|
*/
|
|
typedef enum VisitorType {
|
|
VISITOR_INPUT = 1,
|
|
VISITOR_OUTPUT = 2,
|
|
VISITOR_CLONE = 3,
|
|
VISITOR_DEALLOC = 4,
|
|
} VisitorType;
|
|
|
|
struct Visitor
|
|
{
|
|
/* Must be set to visit structs */
|
|
void (*start_struct)(Visitor *v, const char *name, void **obj,
|
|
size_t size, Error **errp);
|
|
|
|
/* Optional; intended for input visitors */
|
|
void (*check_struct)(Visitor *v, Error **errp);
|
|
|
|
/* Must be set to visit structs */
|
|
void (*end_struct)(Visitor *v, void **obj);
|
|
|
|
/* Must be set; implementations may require @list to be non-null,
|
|
* but must document it. */
|
|
void (*start_list)(Visitor *v, const char *name, GenericList **list,
|
|
size_t size, Error **errp);
|
|
|
|
/* Must be set */
|
|
GenericList *(*next_list)(Visitor *v, GenericList *tail, size_t size);
|
|
|
|
/* Optional; intended for input visitors */
|
|
void (*check_list)(Visitor *v, Error **errp);
|
|
|
|
/* Must be set */
|
|
void (*end_list)(Visitor *v, void **list);
|
|
|
|
/* Must be set by input and dealloc visitors to visit alternates;
|
|
* optional for output visitors. */
|
|
void (*start_alternate)(Visitor *v, const char *name,
|
|
GenericAlternate **obj, size_t size,
|
|
Error **errp);
|
|
|
|
/* Optional, needed for dealloc visitor */
|
|
void (*end_alternate)(Visitor *v, void **obj);
|
|
|
|
/* Must be set */
|
|
void (*type_int64)(Visitor *v, const char *name, int64_t *obj,
|
|
Error **errp);
|
|
|
|
/* Must be set */
|
|
void (*type_uint64)(Visitor *v, const char *name, uint64_t *obj,
|
|
Error **errp);
|
|
|
|
/* Optional; fallback is type_uint64() */
|
|
void (*type_size)(Visitor *v, const char *name, uint64_t *obj,
|
|
Error **errp);
|
|
|
|
/* Must be set */
|
|
void (*type_bool)(Visitor *v, const char *name, bool *obj, Error **errp);
|
|
|
|
/* Must be set */
|
|
void (*type_str)(Visitor *v, const char *name, char **obj, Error **errp);
|
|
|
|
/* Must be set to visit numbers */
|
|
void (*type_number)(Visitor *v, const char *name, double *obj,
|
|
Error **errp);
|
|
|
|
/* Must be set to visit arbitrary QTypes */
|
|
void (*type_any)(Visitor *v, const char *name, QObject **obj,
|
|
Error **errp);
|
|
|
|
/* Must be set to visit explicit null values. */
|
|
void (*type_null)(Visitor *v, const char *name, QNull **obj,
|
|
Error **errp);
|
|
|
|
/* Must be set for input visitors to visit structs, optional otherwise.
|
|
The core takes care of the return type in the public interface. */
|
|
void (*optional)(Visitor *v, const char *name, bool *present);
|
|
|
|
/* Must be set */
|
|
VisitorType type;
|
|
|
|
/* Must be set for output visitors, optional otherwise. */
|
|
void (*complete)(Visitor *v, void *opaque);
|
|
|
|
/* Must be set */
|
|
void (*free)(Visitor *v);
|
|
};
|
|
|
|
#endif
|