In preparation of raising -Wimplicit-fallthrough to 5, replace all
fall-through comments with the fallthrough attribute pseudo-keyword.

Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 qapi/opts-visitor.c         | 1 +
 qapi/string-input-visitor.c | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/qapi/opts-visitor.c b/qapi/opts-visitor.c
index 8f1efab8b9..d7376bf239 100644
--- a/qapi/opts-visitor.c
+++ b/qapi/opts-visitor.c
@@ -249,41 +249,42 @@ static GenericList *
 opts_next_list(Visitor *v, GenericList *tail, size_t size)
 {
     OptsVisitor *ov = to_ov(v);
 
     switch (ov->list_mode) {
     case LM_TRAVERSED:
         return NULL;
     case LM_SIGNED_INTERVAL:
     case LM_UNSIGNED_INTERVAL:
         if (ov->list_mode == LM_SIGNED_INTERVAL) {
             if (ov->range_next.s < ov->range_limit.s) {
                 ++ov->range_next.s;
                 break;
             }
         } else if (ov->range_next.u < ov->range_limit.u) {
             ++ov->range_next.u;
             break;
         }
         ov->list_mode = LM_IN_PROGRESS;
         /* range has been completed, fall through in order to pop option */
+        fallthrough;
 
     case LM_IN_PROGRESS: {
         const QemuOpt *opt;
 
         opt = g_queue_pop_head(ov->repeated_opts);
         if (g_queue_is_empty(ov->repeated_opts)) {
             g_hash_table_remove(ov->unprocessed_opts, opt->name);
             ov->repeated_opts = NULL;
             ov->list_mode = LM_TRAVERSED;
             return NULL;
         }
         break;
     }
 
     default:
         abort();
     }
 
     tail->next = g_malloc0(size);
     return tail->next;
 }
diff --git a/qapi/string-input-visitor.c b/qapi/string-input-visitor.c
index 197139c1c0..1ce43da20b 100644
--- a/qapi/string-input-visitor.c
+++ b/qapi/string-input-visitor.c
@@ -182,41 +182,41 @@ static int try_parse_int64_list_entry(StringInputVisitor *siv, int64_t *obj)
 static bool parse_type_int64(Visitor *v, const char *name, int64_t *obj,
                              Error **errp)
 {
     StringInputVisitor *siv = to_siv(v);
     int64_t val;
 
     switch (siv->lm) {
     case LM_NONE:
         /* just parse a simple int64, bail out if not completely consumed */
         if (qemu_strtoi64(siv->string, NULL, 0, &val)) {
             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
                        name ? name : "null", "int64");
             return false;
         }
         *obj = val;
         return true;
     case LM_UNPARSED:
         if (try_parse_int64_list_entry(siv, obj)) {
             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
                        "list of int64 values or ranges");
             return false;
         }
         assert(siv->lm == LM_INT64_RANGE);
-        /* fall through */
+        fallthrough;
     case LM_INT64_RANGE:
         /* return the next element in the range */
         assert(siv->rangeNext.i64 <= siv->rangeEnd.i64);
         *obj = siv->rangeNext.i64++;
 
         if (siv->rangeNext.i64 > siv->rangeEnd.i64 || *obj == INT64_MAX) {
             /* end of range, check if there is more to parse */
             siv->lm = siv->unparsed_string[0] ? LM_UNPARSED : LM_END;
         }
         return true;
     case LM_END:
         error_setg(errp, "Fewer list elements expected");
         return false;
     default:
         abort();
     }
 }
@@ -272,41 +272,41 @@ static int try_parse_uint64_list_entry(StringInputVisitor *siv, uint64_t *obj)
 static bool parse_type_uint64(Visitor *v, const char *name, uint64_t *obj,
                               Error **errp)
 {
     StringInputVisitor *siv = to_siv(v);
     uint64_t val;
 
     switch (siv->lm) {
     case LM_NONE:
         /* just parse a simple uint64, bail out if not completely consumed */
         if (qemu_strtou64(siv->string, NULL, 0, &val)) {
             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
                        "uint64");
             return false;
         }
         *obj = val;
         return true;
     case LM_UNPARSED:
         if (try_parse_uint64_list_entry(siv, obj)) {
             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
                        "list of uint64 values or ranges");
             return false;
         }
         assert(siv->lm == LM_UINT64_RANGE);
-        /* fall through */
+        fallthrough;
     case LM_UINT64_RANGE:
         /* return the next element in the range */
         assert(siv->rangeNext.u64 <= siv->rangeEnd.u64);
         *obj = siv->rangeNext.u64++;
 
         if (siv->rangeNext.u64 > siv->rangeEnd.u64 || *obj == UINT64_MAX) {
             /* end of range, check if there is more to parse */
             siv->lm = siv->unparsed_string[0] ? LM_UNPARSED : LM_END;
         }
         return true;
     case LM_END:
         error_setg(errp, "Fewer list elements expected");
         return false;
     default:
         abort();
     }
 }
-- 
2.39.2

On Fri, Oct 13, 2023 at 10:56:31AM +0300, Emmanouil Pitsidianakis wrote:
> In preparation of raising -Wimplicit-fallthrough to 5, replace all
> fall-through comments with the fallthrough attribute pseudo-keyword.
> 
> Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
> ---
>  qapi/opts-visitor.c         | 1 +
>  qapi/string-input-visitor.c | 4 ++--
>  2 files changed, 3 insertions(+), 2 deletions(-)
>

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.
Virtualization:  qemu.org | libguestfs.org