Use VRT_BACKEND_string() to get name of backends.

lib/libvmod_directors/shard_cfg.c

@@ -255,8 +255,9 @@ shardcfg_hashcircle(struct sharddir *shardd, VCL_INT replicas)
 
 		ident = shardd->backend[i].ident
 		    ? shardd->backend[i].ident
-		    : shardd->backend[i].backend->vcl_name;
+		    : VRT_BACKEND_string(shardd->backend[i].backend);
 
+		AN(ident);
 		assert(ident[0] != '\0');
 
 		for (j = 0; j < replicas; j++) {
@@ -325,11 +326,13 @@ shardcfg_backend_cmp(const struct shard_backend *a,
 		return a->backend != b->backend;
 
 	if (ai == NULL)
-		ai = a->backend->vcl_name;
+		ai = VRT_BACKEND_string(a->backend);
 
 	if (bi == NULL)
-		bi = b->backend->vcl_name;
+		bi = VRT_BACKEND_string(b->backend);
 
+	AN(ai);
+	AN(bi);
 	return strcmp(ai, bi);
 }
 
@@ -549,7 +552,7 @@ shardcfg_apply_change(VRT_CTX, struct sharddir *shardd,
 
 			shard_err(ctx, shardd, "(notice) backend %s%s%s "
 			    "already exists - skipping",
-			    b->backend->vcl_name,
+			    VRT_BACKEND_string(b->backend),
 			    ident ? "/" : "",
 			    ident ? ident : "");
 			break;

lib/libvmod_directors/vdir.c

@@ -115,7 +115,7 @@ vdir_add_backend(VRT_CTX, struct vdir *vd, VCL_BACKEND be, double weight)
 	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
 	if (be == NULL) {
 		VRT_fail(ctx, "%s: NULL backend cannot be added",
-		    vd->dir->vcl_name);
+		    VRT_BACKEND_string(vd->dir));
 		return;
 	}
 	AN(be);
@@ -139,7 +139,7 @@ vdir_remove_backend(VRT_CTX, struct vdir *vd, VCL_BACKEND be, unsigned *cur)
 	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
 	if (be == NULL) {
 		VRT_fail(ctx, "%s: NULL backend cannot be removed",
-		    vd->dir->vcl_name);
+		    VRT_BACKEND_string(vd->dir));
 		return;
 	}
 	CHECK_OBJ(be, DIRECTOR_MAGIC);