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