mirror of
https://github.com/yuzu-emu/unicorn.git
synced 2024-12-25 09:15:36 +00:00
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
|
|
* QEMU Object Model.
|
|
*
|
|
* Based on ideas by Avi Kivity <avi@redhat.com>
|
|
*
|
|
* Copyright (C) 2009 Red Hat Inc.
|
|
*
|
|
* Authors:
|
|
* Luiz Capitulino <lcapitulino@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.
|
|
*
|
|
* QObject Reference Counts Terminology
|
|
* ------------------------------------
|
|
*
|
|
* - Returning references: A function that returns an object may
|
|
* return it as either a weak or a strong reference. If the reference
|
|
* is strong, you are responsible for calling QDECREF() on the reference
|
|
* when you are done.
|
|
*
|
|
* If the reference is weak, the owner of the reference may free it at
|
|
* any time in the future. Before storing the reference anywhere, you
|
|
* should call QINCREF() to make the reference strong.
|
|
*
|
|
* - Transferring ownership: when you transfer ownership of a reference
|
|
* by calling a function, you are no longer responsible for calling
|
|
* QDECREF() when the reference is no longer needed. In other words,
|
|
* when the function returns you must behave as if the reference to the
|
|
* passed object was weak.
|
|
*/
|
|
#ifndef QOBJECT_H
|
|
#define QOBJECT_H
|
|
|
|
#include <stddef.h>
|
|
#include <assert.h>
|
|
|
|
typedef enum {
|
|
QTYPE_NONE,
|
|
QTYPE_QINT,
|
|
QTYPE_QSTRING,
|
|
QTYPE_QDICT,
|
|
QTYPE_QLIST,
|
|
QTYPE_QFLOAT,
|
|
QTYPE_QBOOL,
|
|
QTYPE_QERROR,
|
|
QTYPE_MAX,
|
|
} qtype_code;
|
|
|
|
struct QObject;
|
|
|
|
typedef struct QType {
|
|
qtype_code code;
|
|
void (*destroy)(struct QObject *);
|
|
} QType;
|
|
|
|
typedef struct QObject {
|
|
const QType *type;
|
|
size_t refcnt;
|
|
} QObject;
|
|
|
|
/* Objects definitions must include this */
|
|
#define QObject_HEAD \
|
|
QObject base
|
|
|
|
/* Get the 'base' part of an object */
|
|
#define QOBJECT(obj) (&(obj)->base)
|
|
|
|
/* High-level interface for qobject_incref() */
|
|
#define QINCREF(obj) \
|
|
qobject_incref(QOBJECT(obj))
|
|
|
|
/* High-level interface for qobject_decref() */
|
|
#define QDECREF(obj) \
|
|
qobject_decref(obj ? QOBJECT(obj) : NULL)
|
|
|
|
/* Initialize an object to default values */
|
|
#define QOBJECT_INIT(obj, qtype_type) \
|
|
obj->base.refcnt = 1; \
|
|
obj->base.type = qtype_type
|
|
|
|
/**
|
|
* qobject_incref(): Increment QObject's reference count
|
|
*/
|
|
static inline void qobject_incref(QObject *obj)
|
|
{
|
|
if (obj)
|
|
obj->refcnt++;
|
|
}
|
|
|
|
/**
|
|
* qobject_decref(): Decrement QObject's reference count, deallocate
|
|
* when it reaches zero
|
|
*/
|
|
static inline void qobject_decref(QObject *obj)
|
|
{
|
|
if (obj && --obj->refcnt == 0) {
|
|
assert(obj->type != NULL);
|
|
assert(obj->type->destroy != NULL);
|
|
obj->type->destroy(obj);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qobject_type(): Return the QObject's type
|
|
*/
|
|
static inline qtype_code qobject_type(const QObject *obj)
|
|
{
|
|
assert(obj->type != NULL);
|
|
return obj->type->code;
|
|
}
|
|
|
|
#endif /* QOBJECT_H */
|