205 lines
5.4 KiB
C
205 lines
5.4 KiB
C
/*
|
|
* Copy one QAPI object to another
|
|
*
|
|
* Copyright (C) 2016 Red Hat, Inc.
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/clone-visitor.h"
|
|
#include "qapi/visitor-impl.h"
|
|
#include "qapi/error.h"
|
|
#include "qapi/qmp/qnull.h"
|
|
|
|
struct QapiCloneVisitor {
|
|
Visitor visitor;
|
|
size_t depth;
|
|
};
|
|
|
|
static QapiCloneVisitor *to_qcv(Visitor *v)
|
|
{
|
|
return container_of(v, QapiCloneVisitor, visitor);
|
|
}
|
|
|
|
static bool qapi_clone_start_struct(Visitor *v, const char *name, void **obj,
|
|
size_t size, Error **errp)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
if (!obj) {
|
|
assert(qcv->depth);
|
|
/* Only possible when visiting an alternate's object
|
|
* branch. Nothing further to do here, since the earlier
|
|
* visit_start_alternate() already copied memory. */
|
|
return true;
|
|
}
|
|
|
|
*obj = g_memdup(*obj, size);
|
|
qcv->depth++;
|
|
return true;
|
|
}
|
|
|
|
static void qapi_clone_end(Visitor *v, void **obj)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
assert(qcv->depth);
|
|
if (obj) {
|
|
qcv->depth--;
|
|
}
|
|
}
|
|
|
|
static bool qapi_clone_start_list(Visitor *v, const char *name,
|
|
GenericList **listp, size_t size,
|
|
Error **errp)
|
|
{
|
|
return qapi_clone_start_struct(v, name, (void **)listp, size, errp);
|
|
}
|
|
|
|
static GenericList *qapi_clone_next_list(Visitor *v, GenericList *tail,
|
|
size_t size)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
assert(qcv->depth);
|
|
/* Unshare the tail of the list cloned by g_memdup() */
|
|
tail->next = g_memdup(tail->next, size);
|
|
return tail->next;
|
|
}
|
|
|
|
static bool qapi_clone_start_alternate(Visitor *v, const char *name,
|
|
GenericAlternate **obj, size_t size,
|
|
Error **errp)
|
|
{
|
|
return qapi_clone_start_struct(v, name, (void **)obj, size, errp);
|
|
}
|
|
|
|
static bool qapi_clone_type_int64(Visitor *v, const char *name, int64_t *obj,
|
|
Error **errp)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
assert(qcv->depth);
|
|
/* Value was already cloned by g_memdup() */
|
|
return true;
|
|
}
|
|
|
|
static bool qapi_clone_type_uint64(Visitor *v, const char *name,
|
|
uint64_t *obj, Error **errp)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
assert(qcv->depth);
|
|
/* Value was already cloned by g_memdup() */
|
|
return true;
|
|
}
|
|
|
|
static bool qapi_clone_type_bool(Visitor *v, const char *name, bool *obj,
|
|
Error **errp)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
assert(qcv->depth);
|
|
/* Value was already cloned by g_memdup() */
|
|
return true;
|
|
}
|
|
|
|
static bool qapi_clone_type_str(Visitor *v, const char *name, char **obj,
|
|
Error **errp)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
assert(qcv->depth);
|
|
/*
|
|
* Pointer was already cloned by g_memdup; create fresh copy.
|
|
* Note that as long as qobject-output-visitor accepts NULL instead of
|
|
* "", then we must do likewise. However, we want to obey the
|
|
* input visitor semantics of never producing NULL when the empty
|
|
* string is intended.
|
|
*/
|
|
*obj = g_strdup(*obj ?: "");
|
|
return true;
|
|
}
|
|
|
|
static bool qapi_clone_type_number(Visitor *v, const char *name, double *obj,
|
|
Error **errp)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
assert(qcv->depth);
|
|
/* Value was already cloned by g_memdup() */
|
|
return true;
|
|
}
|
|
|
|
static bool qapi_clone_type_null(Visitor *v, const char *name, QNull **obj,
|
|
Error **errp)
|
|
{
|
|
QapiCloneVisitor *qcv = to_qcv(v);
|
|
|
|
assert(qcv->depth);
|
|
*obj = qnull();
|
|
return true;
|
|
}
|
|
|
|
static void qapi_clone_free(Visitor *v)
|
|
{
|
|
g_free(v);
|
|
}
|
|
|
|
static Visitor *qapi_clone_visitor_new(void)
|
|
{
|
|
QapiCloneVisitor *v;
|
|
|
|
v = g_malloc0(sizeof(*v));
|
|
|
|
v->visitor.type = VISITOR_CLONE;
|
|
v->visitor.start_struct = qapi_clone_start_struct;
|
|
v->visitor.end_struct = qapi_clone_end;
|
|
v->visitor.start_list = qapi_clone_start_list;
|
|
v->visitor.next_list = qapi_clone_next_list;
|
|
v->visitor.end_list = qapi_clone_end;
|
|
v->visitor.start_alternate = qapi_clone_start_alternate;
|
|
v->visitor.end_alternate = qapi_clone_end;
|
|
v->visitor.type_int64 = qapi_clone_type_int64;
|
|
v->visitor.type_uint64 = qapi_clone_type_uint64;
|
|
v->visitor.type_bool = qapi_clone_type_bool;
|
|
v->visitor.type_str = qapi_clone_type_str;
|
|
v->visitor.type_number = qapi_clone_type_number;
|
|
v->visitor.type_null = qapi_clone_type_null;
|
|
v->visitor.free = qapi_clone_free;
|
|
|
|
return &v->visitor;
|
|
}
|
|
|
|
void *qapi_clone(const void *src, bool (*visit_type)(Visitor *, const char *,
|
|
void **, Error **))
|
|
{
|
|
Visitor *v;
|
|
void *dst = (void *) src; /* Cast away const */
|
|
|
|
if (!src) {
|
|
return NULL;
|
|
}
|
|
|
|
v = qapi_clone_visitor_new();
|
|
visit_type(v, NULL, &dst, &error_abort);
|
|
visit_free(v);
|
|
return dst;
|
|
}
|
|
|
|
void qapi_clone_members(void *dst, const void *src, size_t sz,
|
|
bool (*visit_type_members)(Visitor *, void *,
|
|
Error **))
|
|
{
|
|
Visitor *v;
|
|
|
|
v = qapi_clone_visitor_new();
|
|
memcpy(dst, src, sz);
|
|
to_qcv(v)->depth++;
|
|
visit_type_members(v, dst, &error_abort);
|
|
visit_free(v);
|
|
}
|