diff options
Diffstat (limited to 'qapi/qapi-clone-visitor.c')
| -rw-r--r-- | qapi/qapi-clone-visitor.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/qapi/qapi-clone-visitor.c b/qapi/qapi-clone-visitor.c new file mode 100644 index 0000000000..0bb8216372 --- /dev/null +++ b/qapi/qapi-clone-visitor.c @@ -0,0 +1,182 @@ +/* + * 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" + +struct QapiCloneVisitor { + Visitor visitor; + size_t depth; +}; + +static QapiCloneVisitor *to_qcv(Visitor *v) +{ + return container_of(v, QapiCloneVisitor, visitor); +} + +static void 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; + } + + *obj = g_memdup(*obj, size); + qcv->depth++; +} + +static void qapi_clone_end(Visitor *v, void **obj) +{ + QapiCloneVisitor *qcv = to_qcv(v); + + assert(qcv->depth); + if (obj) { + qcv->depth--; + } +} + +static void qapi_clone_start_list(Visitor *v, const char *name, + GenericList **listp, size_t size, + Error **errp) +{ + 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 void qapi_clone_start_alternate(Visitor *v, const char *name, + GenericAlternate **obj, size_t size, + bool promote_int, Error **errp) +{ + qapi_clone_start_struct(v, name, (void **)obj, size, errp); +} + +static void 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() */ +} + +static void 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() */ +} + +static void 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() */ +} + +static void 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 qmp-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 ?: ""); +} + +static void 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() */ +} + +static void qapi_clone_type_null(Visitor *v, const char *name, Error **errp) +{ + QapiCloneVisitor *qcv = to_qcv(v); + + assert(qcv->depth); + /* Nothing to do */ +} + +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, void (*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; +} |