Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2016-02-09' into staging

QAPI patches for 2016-02-09

# gpg: Signature made Tue 09 Feb 2016 10:55:51 GMT using RSA key ID EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"

* remotes/armbru/tags/pull-qapi-2016-02-09: (31 commits)
  qapi: Add missing JSON files in build dependencies
  qapi: Fix compilation failure on MIPS and SPARC
  qmp: Don't abuse stack to track qmp-output root
  qmp: Fix reference-counting of qnull on empty output visit
  qapi: Drop unused error argument for list and implicit struct
  qapi: Tighten qmp_input_end_list()
  qapi: Drop unused 'kind' for struct/enum visit
  qapi: Swap 'name' in visit_* callbacks to match public API
  qom: Swap 'name' next to visitor in ObjectPropertyAccessor
  qapi: Swap visit_* arguments for consistent 'name' placement
  qom: Use typedef for Visitor
  qapi: Don't cast Enum* to int*
  qapi: Consolidate visitor small integer callbacks
  qapi: Make all visitors supply uint64 callbacks
  qapi: Prefer type_int64 over type_int in visitors
  qapi-visit: Kill unused visit_end_union()
  qapi: Track all failures between visit_start/stop
  qapi: Improve generated event use of qapi visitor
  balloon: Improve use of qapi visitor
  vl: Ensure qapi visitor properly ends struct visit
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

7 files changed, 317 insertions, 324 deletions

diff --git a/qapi/opts-visitor.c b/qapi/opts-visitor.c
index eb7d85b..d54f75b 100644
--- a/qapi/opts-visitor.c
+++ b/qapi/opts-visitor.c
@@ -1,7 +1,7 @@
 /*
  * Options Visitor
  *
- * Copyright Red Hat, Inc. 2012, 2013
+ * Copyright Red Hat, Inc. 2012-2016
  *
  * Author: Laszlo Ersek <lersek@redhat.com>
  *
@@ -90,6 +90,12 @@ struct OptsVisitor
 };
 
 
+static OptsVisitor *to_ov(Visitor *v)
+{
+    return container_of(v, OptsVisitor, visitor);
+}
+
+
 static void
 destroy_list(gpointer list)
 {
@@ -119,10 +125,10 @@ opts_visitor_insert(GHashTable *unprocessed_opts, const QemuOpt *opt)
 
 
 static void
-opts_start_struct(Visitor *v, void **obj, const char *kind,
-                  const char *name, size_t size, Error **errp)
+opts_start_struct(Visitor *v, const char *name, void **obj,
+                  size_t size, Error **errp)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
     const QemuOpt *opt;
 
     if (obj) {
@@ -161,7 +167,7 @@ ghr_true(gpointer ign_key, gpointer ign_value, gpointer ign_user_data)
 static void
 opts_end_struct(Visitor *v, Error **errp)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
     GQueue *any;
 
     if (--ov->depth > 0) {
@@ -203,7 +209,7 @@ lookup_distinct(const OptsVisitor *ov, const char *name, Error **errp)
 static void
 opts_start_list(Visitor *v, const char *name, Error **errp)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
 
     /* we can't traverse a list in a list */
     assert(ov->list_mode == LM_NONE);
@@ -215,9 +221,9 @@ opts_start_list(Visitor *v, const char *name, Error **errp)
 
 
 static GenericList *
-opts_next_list(Visitor *v, GenericList **list, Error **errp)
+opts_next_list(Visitor *v, GenericList **list)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
     GenericList **link;
 
     switch (ov->list_mode) {
@@ -264,9 +270,9 @@ opts_next_list(Visitor *v, GenericList **list, Error **errp)
 
 
 static void
-opts_end_list(Visitor *v, Error **errp)
+opts_end_list(Visitor *v)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
 
     assert(ov->list_mode == LM_STARTED ||
            ov->list_mode == LM_IN_PROGRESS ||
@@ -306,9 +312,9 @@ processed(OptsVisitor *ov, const char *name)
 
 
 static void
-opts_type_str(Visitor *v, char **obj, const char *name, Error **errp)
+opts_type_str(Visitor *v, const char *name, char **obj, Error **errp)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
     const QemuOpt *opt;
 
     opt = lookup_scalar(ov, name, errp);
@@ -322,9 +328,9 @@ opts_type_str(Visitor *v, char **obj, const char *name, Error **errp)
 
 /* mimics qemu-option.c::parse_option_bool() */
 static void
-opts_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
+opts_type_bool(Visitor *v, const char *name, bool *obj, Error **errp)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
     const QemuOpt *opt;
 
     opt = lookup_scalar(ov, name, errp);
@@ -355,9 +361,9 @@ opts_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
 
 
 static void
-opts_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
+opts_type_int64(Visitor *v, const char *name, int64_t *obj, Error **errp)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
     const QemuOpt *opt;
     const char *str;
     long long val;
@@ -411,9 +417,9 @@ opts_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
 
 
 static void
-opts_type_uint64(Visitor *v, uint64_t *obj, const char *name, Error **errp)
+opts_type_uint64(Visitor *v, const char *name, uint64_t *obj, Error **errp)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
     const QemuOpt *opt;
     const char *str;
     unsigned long long val;
@@ -463,9 +469,9 @@ opts_type_uint64(Visitor *v, uint64_t *obj, const char *name, Error **errp)
 
 
 static void
-opts_type_size(Visitor *v, uint64_t *obj, const char *name, Error **errp)
+opts_type_size(Visitor *v, const char *name, uint64_t *obj, Error **errp)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
     const QemuOpt *opt;
     int64_t val;
     char *endptr;
@@ -489,9 +495,9 @@ opts_type_size(Visitor *v, uint64_t *obj, const char *name, Error **errp)
 
 
 static void
-opts_optional(Visitor *v, bool *present, const char *name)
+opts_optional(Visitor *v, const char *name, bool *present)
 {
-    OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
+    OptsVisitor *ov = to_ov(v);
 
     /* we only support a single mandatory scalar field in a list node */
     assert(ov->list_mode == LM_NONE);
@@ -523,7 +529,7 @@ opts_visitor_new(const QemuOpts *opts)
      */
     ov->visitor.type_enum = &input_type_enum;
 
-    ov->visitor.type_int    = &opts_type_int;
+    ov->visitor.type_int64  = &opts_type_int64;
     ov->visitor.type_uint64 = &opts_type_uint64;
     ov->visitor.type_size   = &opts_type_size;
     ov->visitor.type_bool   = &opts_type_bool;
diff --git a/qapi/qapi-dealloc-visitor.c b/qapi/qapi-dealloc-visitor.c
index 9340446..2659d3f 100644
--- a/qapi/qapi-dealloc-visitor.c
+++ b/qapi/qapi-dealloc-visitor.c
@@ -1,6 +1,7 @@
 /*
  * Dealloc Visitor
  *
+ * Copyright (C) 2012-2016 Red Hat, Inc.
  * Copyright IBM, Corp. 2011
  *
  * Authors:
@@ -29,7 +30,6 @@ struct QapiDeallocVisitor
 {
     Visitor visitor;
     QTAILQ_HEAD(, StackEntry) stack;
-    bool is_list_head;
 };
 
 static QapiDeallocVisitor *to_qov(Visitor *v)
@@ -60,9 +60,8 @@ static void *qapi_dealloc_pop(QapiDeallocVisitor *qov)
     return value;
 }
 
-static void qapi_dealloc_start_struct(Visitor *v, void **obj, const char *kind,
-                                      const char *name, size_t unused,
-                                      Error **errp)
+static void qapi_dealloc_start_struct(Visitor *v, const char *name, void **obj,
+                                      size_t unused, Error **errp)
 {
     QapiDeallocVisitor *qov = to_qov(v);
     qapi_dealloc_push(qov, obj);
@@ -86,7 +85,7 @@ static void qapi_dealloc_start_implicit_struct(Visitor *v,
     qapi_dealloc_push(qov, obj);
 }
 
-static void qapi_dealloc_end_implicit_struct(Visitor *v, Error **errp)
+static void qapi_dealloc_end_implicit_struct(Visitor *v)
 {
     QapiDeallocVisitor *qov = to_qov(v);
     void **obj = qapi_dealloc_pop(qov);
@@ -101,8 +100,7 @@ static void qapi_dealloc_start_list(Visitor *v, const char *name, Error **errp)
     qapi_dealloc_push(qov, NULL);
 }
 
-static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp,
-                                           Error **errp)
+static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp)
 {
     GenericList *list = *listp;
     QapiDeallocVisitor *qov = to_qov(v);
@@ -122,14 +120,14 @@ static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **listp,
     return NULL;
 }
 
-static void qapi_dealloc_end_list(Visitor *v, Error **errp)
+static void qapi_dealloc_end_list(Visitor *v)
 {
     QapiDeallocVisitor *qov = to_qov(v);
     void *obj = qapi_dealloc_pop(qov);
     assert(obj == NULL); /* should've been list head tracker with no payload */
 }
 
-static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name,
+static void qapi_dealloc_type_str(Visitor *v, const char *name, char **obj,
                                   Error **errp)
 {
     if (obj) {
@@ -137,38 +135,36 @@ static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name,
     }
 }
 
-static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name,
-                                  Error **errp)
+static void qapi_dealloc_type_int64(Visitor *v, const char *name, int64_t *obj,
+                                    Error **errp)
+{
+}
+
+static void qapi_dealloc_type_uint64(Visitor *v, const char *name,
+                                     uint64_t *obj, Error **errp)
 {
 }
 
-static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name,
+static void qapi_dealloc_type_bool(Visitor *v, const char *name, bool *obj,
                                    Error **errp)
 {
 }
 
-static void qapi_dealloc_type_number(Visitor *v, double *obj, const char *name,
+static void qapi_dealloc_type_number(Visitor *v, const char *name, double *obj,
                                      Error **errp)
 {
 }
 
-static void qapi_dealloc_type_anything(Visitor *v, QObject **obj,
-                                       const char *name, Error **errp)
+static void qapi_dealloc_type_anything(Visitor *v, const char *name,
+                                       QObject **obj, Error **errp)
 {
     if (obj) {
         qobject_decref(*obj);
     }
 }
 
-static void qapi_dealloc_type_size(Visitor *v, uint64_t *obj, const char *name,
-                                   Error **errp)
-{
-}
-
-static void qapi_dealloc_type_enum(Visitor *v, int *obj,
-                                   const char * const strings[],
-                                   const char *kind, const char *name,
-                                   Error **errp)
+static void qapi_dealloc_type_enum(Visitor *v, const char *name, int *obj,
+                                   const char * const strings[], Error **errp)
 {
 }
 
@@ -221,12 +217,12 @@ QapiDeallocVisitor *qapi_dealloc_visitor_new(void)
     v->visitor.next_list = qapi_dealloc_next_list;
     v->visitor.end_list = qapi_dealloc_end_list;
     v->visitor.type_enum = qapi_dealloc_type_enum;
-    v->visitor.type_int = qapi_dealloc_type_int;
+    v->visitor.type_int64 = qapi_dealloc_type_int64;
+    v->visitor.type_uint64 = qapi_dealloc_type_uint64;
     v->visitor.type_bool = qapi_dealloc_type_bool;
     v->visitor.type_str = qapi_dealloc_type_str;
     v->visitor.type_number = qapi_dealloc_type_number;
     v->visitor.type_any = qapi_dealloc_type_anything;
-    v->visitor.type_size = qapi_dealloc_type_size;
     v->visitor.start_union = qapi_dealloc_start_union;
 
     QTAILQ_INIT(&v->stack);
diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index 8473d3c..f856286 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -1,6 +1,7 @@
 /*
  * Core Definitions for QAPI Visitor Classes
  *
+ * Copyright (C) 2012-2016 Red Hat, Inc.
  * Copyright IBM, Corp. 2011
  *
  * Authors:
@@ -18,10 +19,10 @@
 #include "qapi/visitor.h"
 #include "qapi/visitor-impl.h"
 
-void visit_start_struct(Visitor *v, void **obj, const char *kind,
-                        const char *name, size_t size, Error **errp)
+void visit_start_struct(Visitor *v, const char *name, void **obj,
+                        size_t size, Error **errp)
 {
-    v->start_struct(v, obj, kind, name, size, errp);
+    v->start_struct(v, name, obj, size, errp);
 }
 
 void visit_end_struct(Visitor *v, Error **errp)
@@ -37,10 +38,10 @@ void visit_start_implicit_struct(Visitor *v, void **obj, size_t size,
     }
 }
 
-void visit_end_implicit_struct(Visitor *v, Error **errp)
+void visit_end_implicit_struct(Visitor *v)
 {
     if (v->end_implicit_struct) {
-        v->end_implicit_struct(v, errp);
+        v->end_implicit_struct(v);
     }
 }
 
@@ -49,14 +50,14 @@ void visit_start_list(Visitor *v, const char *name, Error **errp)
     v->start_list(v, name, errp);
 }
 
-GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp)
+GenericList *visit_next_list(Visitor *v, GenericList **list)
 {
-    return v->next_list(v, list, errp);
+    return v->next_list(v, list);
 }
 
-void visit_end_list(Visitor *v, Error **errp)
+void visit_end_list(Visitor *v)
 {
-    v->end_list(v, errp);
+    v->end_list(v);
 }
 
 bool visit_start_union(Visitor *v, bool data_present, Error **errp)
@@ -67,209 +68,160 @@ bool visit_start_union(Visitor *v, bool data_present, Error **errp)
     return true;
 }
 
-void visit_end_union(Visitor *v, bool data_present, Error **errp)
-{
-    if (v->end_union) {
-        v->end_union(v, data_present, errp);
-    }
-}
-
-bool visit_optional(Visitor *v, bool *present, const char *name)
+bool visit_optional(Visitor *v, const char *name, bool *present)
 {
     if (v->optional) {
-        v->optional(v, present, name);
+        v->optional(v, name, present);
     }
     return *present;
 }
 
-void visit_get_next_type(Visitor *v, QType *type, bool promote_int,
-                         const char *name, Error **errp)
+void visit_get_next_type(Visitor *v, const char *name, QType *type,
+                         bool promote_int, Error **errp)
 {
     if (v->get_next_type) {
-        v->get_next_type(v, type, promote_int, name, errp);
+        v->get_next_type(v, name, type, promote_int, errp);
     }
 }
 
-void visit_type_enum(Visitor *v, int *obj, const char * const strings[],
-                     const char *kind, const char *name, Error **errp)
+void visit_type_enum(Visitor *v, const char *name, int *obj,
+                     const char *const strings[], Error **errp)
 {
-    v->type_enum(v, obj, strings, kind, name, errp);
+    v->type_enum(v, name, obj, strings, errp);
 }
 
-void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
+void visit_type_int(Visitor *v, const char *name, int64_t *obj, Error **errp)
 {
-    v->type_int(v, obj, name, errp);
+    v->type_int64(v, name, obj, errp);
 }
 
-void visit_type_uint8(Visitor *v, uint8_t *obj, const char *name, Error **errp)
+static void visit_type_uintN(Visitor *v, uint64_t *obj, const char *name,
+                             uint64_t max, const char *type, Error **errp)
 {
-    int64_t value;
-
-    if (v->type_uint8) {
-        v->type_uint8(v, obj, name, errp);
+    Error *err = NULL;
+    uint64_t value = *obj;
+
+    v->type_uint64(v, name, &value, &err);
+    if (err) {
+        error_propagate(errp, err);
+    } else if (value > max) {
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+                   name ? name : "null", type);
     } else {
-        value = *obj;
-        v->type_int(v, &value, name, errp);
-        if (value < 0 || value > UINT8_MAX) {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                       name ? name : "null", "uint8_t");
-            return;
-        }
         *obj = value;
     }
 }
 
-void visit_type_uint16(Visitor *v, uint16_t *obj, const char *name, Error **errp)
+void visit_type_uint8(Visitor *v, const char *name, uint8_t *obj,
+                      Error **errp)
 {
-    int64_t value;
-
-    if (v->type_uint16) {
-        v->type_uint16(v, obj, name, errp);
-    } else {
-        value = *obj;
-        v->type_int(v, &value, name, errp);
-        if (value < 0 || value > UINT16_MAX) {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                       name ? name : "null", "uint16_t");
-            return;
-        }
-        *obj = value;
-    }
+    uint64_t value = *obj;
+    visit_type_uintN(v, &value, name, UINT8_MAX, "uint8_t", errp);
+    *obj = value;
 }
 
-void visit_type_uint32(Visitor *v, uint32_t *obj, const char *name, Error **errp)
+void visit_type_uint16(Visitor *v, const char *name, uint16_t *obj,
+                       Error **errp)
 {
-    int64_t value;
-
-    if (v->type_uint32) {
-        v->type_uint32(v, obj, name, errp);
-    } else {
-        value = *obj;
-        v->type_int(v, &value, name, errp);
-        if (value < 0 || value > UINT32_MAX) {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                       name ? name : "null", "uint32_t");
-            return;
-        }
-        *obj = value;
-    }
+    uint64_t value = *obj;
+    visit_type_uintN(v, &value, name, UINT16_MAX, "uint16_t", errp);
+    *obj = value;
 }
 
-void visit_type_uint64(Visitor *v, uint64_t *obj, const char *name, Error **errp)
+void visit_type_uint32(Visitor *v, const char *name, uint32_t *obj,
+                       Error **errp)
 {
-    int64_t value;
-
-    if (v->type_uint64) {
-        v->type_uint64(v, obj, name, errp);
-    } else {
-        value = *obj;
-        v->type_int(v, &value, name, errp);
-        *obj = value;
-    }
+    uint64_t value = *obj;
+    visit_type_uintN(v, &value, name, UINT32_MAX, "uint32_t", errp);
+    *obj = value;
 }
 
-void visit_type_int8(Visitor *v, int8_t *obj, const char *name, Error **errp)
+void visit_type_uint64(Visitor *v, const char *name, uint64_t *obj,
+                       Error **errp)
 {
-    int64_t value;
-
-    if (v->type_int8) {
-        v->type_int8(v, obj, name, errp);
-    } else {
-        value = *obj;
-        v->type_int(v, &value, name, errp);
-        if (value < INT8_MIN || value > INT8_MAX) {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                       name ? name : "null", "int8_t");
-            return;
-        }
-        *obj = value;
-    }
+    v->type_uint64(v, name, obj, errp);
 }
 
-void visit_type_int16(Visitor *v, int16_t *obj, const char *name, Error **errp)
+static void visit_type_intN(Visitor *v, int64_t *obj, const char *name,
+                            int64_t min, int64_t max, const char *type,
+                            Error **errp)
 {
-    int64_t value;
-
-    if (v->type_int16) {
-        v->type_int16(v, obj, name, errp);
+    Error *err = NULL;
+    int64_t value = *obj;
+
+    v->type_int64(v, name, &value, &err);
+    if (err) {
+        error_propagate(errp, err);
+    } else if (value < min || value > max) {
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+                   name ? name : "null", type);
     } else {
-        value = *obj;
-        v->type_int(v, &value, name, errp);
-        if (value < INT16_MIN || value > INT16_MAX) {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                       name ? name : "null", "int16_t");
-            return;
-        }
         *obj = value;
     }
 }
 
-void visit_type_int32(Visitor *v, int32_t *obj, const char *name, Error **errp)
+void visit_type_int8(Visitor *v, const char *name, int8_t *obj, Error **errp)
 {
-    int64_t value;
+    int64_t value = *obj;
+    visit_type_intN(v, &value, name, INT8_MIN, INT8_MAX, "int8_t", errp);
+    *obj = value;
+}
 
-    if (v->type_int32) {
-        v->type_int32(v, obj, name, errp);
-    } else {
-        value = *obj;
-        v->type_int(v, &value, name, errp);
-        if (value < INT32_MIN || value > INT32_MAX) {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                       name ? name : "null", "int32_t");
-            return;
-        }
-        *obj = value;
-    }
+void visit_type_int16(Visitor *v, const char *name, int16_t *obj,
+                      Error **errp)
+{
+    int64_t value = *obj;
+    visit_type_intN(v, &value, name, INT16_MIN, INT16_MAX, "int16_t", errp);
+    *obj = value;
 }
 
-void visit_type_int64(Visitor *v, int64_t *obj, const char *name, Error **errp)
+void visit_type_int32(Visitor *v, const char *name, int32_t *obj,
+                      Error **errp)
 {
-    if (v->type_int64) {
-        v->type_int64(v, obj, name, errp);
-    } else {
-        v->type_int(v, obj, name, errp);
-    }
+    int64_t value = *obj;
+    visit_type_intN(v, &value, name, INT32_MIN, INT32_MAX, "int32_t", errp);
+    *obj = value;
 }
 
-void visit_type_size(Visitor *v, uint64_t *obj, const char *name, Error **errp)
+void visit_type_int64(Visitor *v, const char *name, int64_t *obj,
+                      Error **errp)
 {
-    int64_t value;
+    v->type_int64(v, name, obj, errp);
+}
 
+void visit_type_size(Visitor *v, const char *name, uint64_t *obj,
+                     Error **errp)
+{
     if (v->type_size) {
-        v->type_size(v, obj, name, errp);
-    } else if (v->type_uint64) {
-        v->type_uint64(v, obj, name, errp);
+        v->type_size(v, name, obj, errp);
     } else {
-        value = *obj;
-        v->type_int(v, &value, name, errp);
-        *obj = value;
+        v->type_uint64(v, name, obj, errp);
     }
 }
 
-void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
+void visit_type_bool(Visitor *v, const char *name, bool *obj, Error **errp)
 {
-    v->type_bool(v, obj, name, errp);
+    v->type_bool(v, name, obj, errp);
 }
 
-void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp)
+void visit_type_str(Visitor *v, const char *name, char **obj, Error **errp)
 {
-    v->type_str(v, obj, name, errp);
+    v->type_str(v, name, obj, errp);
 }
 
-void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp)
+void visit_type_number(Visitor *v, const char *name, double *obj,
+                       Error **errp)
 {
-    v->type_number(v, obj, name, errp);
+    v->type_number(v, name, obj, errp);
 }
 
-void visit_type_any(Visitor *v, QObject **obj, const char *name,
-                    Error **errp)
+void visit_type_any(Visitor *v, const char *name, QObject **obj, Error **errp)
 {
-    v->type_any(v, obj, name, errp);
+    v->type_any(v, name, obj, errp);
 }
 
-void output_type_enum(Visitor *v, int *obj, const char * const strings[],
-                      const char *kind, const char *name,
-                      Error **errp)
+void output_type_enum(Visitor *v, const char *name, int *obj,
+                      const char *const strings[], Error **errp)
 {
     int i = 0;
     int value = *obj;
@@ -283,12 +235,11 @@ void output_type_enum(Visitor *v, int *obj, const char * const strings[],
     }
 
     enum_str = (char *)strings[value];
-    visit_type_str(v, &enum_str, name, errp);
+    visit_type_str(v, name, &enum_str, errp);
 }
 
-void input_type_enum(Visitor *v, int *obj, const char * const strings[],
-                     const char *kind, const char *name,
-                     Error **errp)
+void input_type_enum(Visitor *v, const char *name, int *obj,
+                     const char *const strings[], Error **errp)
 {
     Error *local_err = NULL;
     int64_t value = 0;
@@ -296,7 +247,7 @@ void input_type_enum(Visitor *v, int *obj, const char * const strings[],
 
     assert(strings);
 
-    visit_type_str(v, &enum_str, name, &local_err);
+    visit_type_str(v, name, &enum_str, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c
index edb8bd2..362a1a3 100644
--- a/qapi/qmp-input-visitor.c
+++ b/qapi/qmp-input-visitor.c
@@ -1,6 +1,7 @@
 /*
  * Input Visitor
  *
+ * Copyright (C) 2012-2016 Red Hat, Inc.
  * Copyright IBM, Corp. 2011
  *
  * Authors:
@@ -115,8 +116,8 @@ static void qmp_input_pop(QmpInputVisitor *qiv, Error **errp)
     qiv->nb_stack--;
 }
 
-static void qmp_input_start_struct(Visitor *v, void **obj, const char *kind,
-                                   const char *name, size_t size, Error **errp)
+static void qmp_input_start_struct(Visitor *v, const char *name, void **obj,
+                                   size_t size, Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
     QObject *qobj = qmp_input_get_object(qiv, name, true);
@@ -154,10 +155,6 @@ static void qmp_input_start_implicit_struct(Visitor *v, void **obj,
     }
 }
 
-static void qmp_input_end_implicit_struct(Visitor *v, Error **errp)
-{
-}
-
 static void qmp_input_start_list(Visitor *v, const char *name, Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
@@ -172,8 +169,7 @@ static void qmp_input_start_list(Visitor *v, const char *name, Error **errp)
     qmp_input_push(qiv, qobj, errp);
 }
 
-static GenericList *qmp_input_next_list(Visitor *v, GenericList **list,
-                                        Error **errp)
+static GenericList *qmp_input_next_list(Visitor *v, GenericList **list)
 {
     QmpInputVisitor *qiv = to_qiv(v);
     GenericList *entry;
@@ -202,15 +198,15 @@ static GenericList *qmp_input_next_list(Visitor *v, GenericList **list,
     return entry;
 }
 
-static void qmp_input_end_list(Visitor *v, Error **errp)
+static void qmp_input_end_list(Visitor *v)
 {
     QmpInputVisitor *qiv = to_qiv(v);
 
-    qmp_input_pop(qiv, errp);
+    qmp_input_pop(qiv, &error_abort);
 }
 
-static void qmp_input_get_next_type(Visitor *v, QType *type, bool promote_int,
-                                    const char *name, Error **errp)
+static void qmp_input_get_next_type(Visitor *v, const char *name, QType *type,
+                                    bool promote_int, Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
     QObject *qobj = qmp_input_get_object(qiv, name, false);
@@ -225,9 +221,25 @@ static void qmp_input_get_next_type(Visitor *v, QType *type, bool promote_int,
     }
 }
 
-static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name,
-                               Error **errp)
+static void qmp_input_type_int64(Visitor *v, const char *name, int64_t *obj,
+                                 Error **errp)
+{
+    QmpInputVisitor *qiv = to_qiv(v);
+    QInt *qint = qobject_to_qint(qmp_input_get_object(qiv, name, true));
+
+    if (!qint) {
+        error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
+                   "integer");
+        return;
+    }
+
+    *obj = qint_get_int(qint);
+}
+
+static void qmp_input_type_uint64(Visitor *v, const char *name, uint64_t *obj,
+                                  Error **errp)
 {
+    /* FIXME: qobject_to_qint mishandles values over INT64_MAX */
     QmpInputVisitor *qiv = to_qiv(v);
     QInt *qint = qobject_to_qint(qmp_input_get_object(qiv, name, true));
 
@@ -240,7 +252,7 @@ static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name,
     *obj = qint_get_int(qint);
 }
 
-static void qmp_input_type_bool(Visitor *v, bool *obj, const char *name,
+static void qmp_input_type_bool(Visitor *v, const char *name, bool *obj,
                                 Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
@@ -255,7 +267,7 @@ static void qmp_input_type_bool(Visitor *v, bool *obj, const char *name,
     *obj = qbool_get_bool(qbool);
 }
 
-static void qmp_input_type_str(Visitor *v, char **obj, const char *name,
+static void qmp_input_type_str(Visitor *v, const char *name, char **obj,
                                Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
@@ -270,7 +282,7 @@ static void qmp_input_type_str(Visitor *v, char **obj, const char *name,
     *obj = g_strdup(qstring_get_str(qstr));
 }
 
-static void qmp_input_type_number(Visitor *v, double *obj, const char *name,
+static void qmp_input_type_number(Visitor *v, const char *name, double *obj,
                                   Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
@@ -294,7 +306,7 @@ static void qmp_input_type_number(Visitor *v, double *obj, const char *name,
                "number");
 }
 
-static void qmp_input_type_any(Visitor *v, QObject **obj, const char *name,
+static void qmp_input_type_any(Visitor *v, const char *name, QObject **obj,
                                Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
@@ -304,7 +316,7 @@ static void qmp_input_type_any(Visitor *v, QObject **obj, const char *name,
     *obj = qobj;
 }
 
-static void qmp_input_optional(Visitor *v, bool *present, const char *name)
+static void qmp_input_optional(Visitor *v, const char *name, bool *present)
 {
     QmpInputVisitor *qiv = to_qiv(v);
     QObject *qobj = qmp_input_get_object(qiv, name, true);
@@ -337,12 +349,12 @@ QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
     v->visitor.start_struct = qmp_input_start_struct;
     v->visitor.end_struct = qmp_input_end_struct;
     v->visitor.start_implicit_struct = qmp_input_start_implicit_struct;
-    v->visitor.end_implicit_struct = qmp_input_end_implicit_struct;
     v->visitor.start_list = qmp_input_start_list;
     v->visitor.next_list = qmp_input_next_list;
     v->visitor.end_list = qmp_input_end_list;
     v->visitor.type_enum = input_type_enum;
-    v->visitor.type_int = qmp_input_type_int;
+    v->visitor.type_int64 = qmp_input_type_int64;
+    v->visitor.type_uint64 = qmp_input_type_uint64;
     v->visitor.type_bool = qmp_input_type_bool;
     v->visitor.type_str = qmp_input_type_str;
     v->visitor.type_number = qmp_input_type_number;
diff --git a/qapi/qmp-output-visitor.c b/qapi/qmp-output-visitor.c
index b064fb5..f47eefa 100644
--- a/qapi/qmp-output-visitor.c
+++ b/qapi/qmp-output-visitor.c
@@ -1,6 +1,7 @@
 /*
  * Core Definitions for QAPI/QMP Command Registry
  *
+ * Copyright (C) 2012-2016 Red Hat, Inc.
  * Copyright IBM, Corp. 2011
  *
  * Authors:
@@ -30,7 +31,8 @@ typedef QTAILQ_HEAD(QStack, QStackEntry) QStack;
 struct QmpOutputVisitor
 {
     Visitor visitor;
-    QStack stack;
+    QStack stack; /* Stack of containers that haven't yet been finished */
+    QObject *root; /* Root of the output visit */
 };
 
 #define qmp_output_add(qov, name, value) \
@@ -42,10 +44,13 @@ static QmpOutputVisitor *to_qov(Visitor *v)
     return container_of(v, QmpOutputVisitor, visitor);
 }
 
+/* Push @value onto the stack of current QObjects being built */
 static void qmp_output_push_obj(QmpOutputVisitor *qov, QObject *value)
 {
     QStackEntry *e = g_malloc0(sizeof(*e));
 
+    assert(qov->root);
+    assert(value);
     e->value = value;
     if (qobject_type(e->value) == QTYPE_QLIST) {
         e->is_list_head = true;
@@ -53,67 +58,51 @@ static void qmp_output_push_obj(QmpOutputVisitor *qov, QObject *value)
     QTAILQ_INSERT_HEAD(&qov->stack, e, node);
 }
 
+/* Pop a value off the stack of QObjects being built, and return it. */
 static QObject *qmp_output_pop(QmpOutputVisitor *qov)
 {
     QStackEntry *e = QTAILQ_FIRST(&qov->stack);
     QObject *value;
+
+    assert(e);
     QTAILQ_REMOVE(&qov->stack, e, node);
     value = e->value;
+    assert(value);
     g_free(e);
     return value;
 }
 
-static QObject *qmp_output_first(QmpOutputVisitor *qov)
-{
-    QStackEntry *e = QTAILQ_LAST(&qov->stack, QStack);
-
-    /*
-     * FIXME Wrong, because qmp_output_get_qobject() will increment
-     * the refcnt *again*.  We need to think through how visitors
-     * handle null.
-     */
-    if (!e) {
-        return qnull();
-    }
-
-    return e->value;
-}
-
-static QObject *qmp_output_last(QmpOutputVisitor *qov)
-{
-    QStackEntry *e = QTAILQ_FIRST(&qov->stack);
-    return e->value;
-}
-
+/* Add @value to the current QObject being built.
+ * If the stack is visiting a dictionary or list, @value is now owned
+ * by that container. Otherwise, @value is now the root.  */
 static void qmp_output_add_obj(QmpOutputVisitor *qov, const char *name,
                                QObject *value)
 {
-    QObject *cur;
-
-    if (QTAILQ_EMPTY(&qov->stack)) {
-        qmp_output_push_obj(qov, value);
-        return;
-    }
+    QStackEntry *e = QTAILQ_FIRST(&qov->stack);
+    QObject *cur = e ? e->value : NULL;
 
-    cur = qmp_output_last(qov);
-
-    switch (qobject_type(cur)) {
-    case QTYPE_QDICT:
-        qdict_put_obj(qobject_to_qdict(cur), name, value);
-        break;
-    case QTYPE_QLIST:
-        qlist_append_obj(qobject_to_qlist(cur), value);
-        break;
-    default:
-        qobject_decref(qmp_output_pop(qov));
-        qmp_output_push_obj(qov, value);
-        break;
+    if (!cur) {
+        /* FIXME we should require the user to reset the visitor, rather
+         * than throwing away the previous root */
+        qobject_decref(qov->root);
+        qov->root = value;
+    } else {
+        switch (qobject_type(cur)) {
+        case QTYPE_QDICT:
+            assert(name);
+            qdict_put_obj(qobject_to_qdict(cur), name, value);
+            break;
+        case QTYPE_QLIST:
+            qlist_append_obj(qobject_to_qlist(cur), value);
+            break;
+        default:
+            g_assert_not_reached();
+        }
     }
 }
 
-static void qmp_output_start_struct(Visitor *v, void **obj, const char *kind,
-                                    const char *name, size_t unused,
-                                    Error **errp)
+static void qmp_output_start_struct(Visitor *v, const char *name, void **obj,
+                                    size_t unused, Error **errp)
 {
     QmpOutputVisitor *qov = to_qov(v);
     QDict *dict = qdict_new();
@@ -137,8 +126,7 @@ static void qmp_output_start_list(Visitor *v, const char *name, Error **errp)
     qmp_output_push(qov, list);
 }
 
-static GenericList *qmp_output_next_list(Visitor *v, GenericList **listp,
-                                         Error **errp)
+static GenericList *qmp_output_next_list(Visitor *v, GenericList **listp)
 {
     GenericList *list = *listp;
     QmpOutputVisitor *qov = to_qov(v);
@@ -153,27 +141,35 @@ static GenericList *qmp_output_next_list(Visitor *v, GenericList **listp,
     return list ? list->next : NULL;
 }
 
-static void qmp_output_end_list(Visitor *v, Error **errp)
+static void qmp_output_end_list(Visitor *v)
 {
     QmpOutputVisitor *qov = to_qov(v);
     qmp_output_pop(qov);
 }
 
-static void qmp_output_type_int(Visitor *v, int64_t *obj, const char *name,
-                                Error **errp)
+static void qmp_output_type_int64(Visitor *v, const char *name, int64_t *obj,
+                                  Error **errp)
+{
+    QmpOutputVisitor *qov = to_qov(v);
+    qmp_output_add(qov, name, qint_from_int(*obj));
+}
+
+static void qmp_output_type_uint64(Visitor *v, const char *name, uint64_t *obj,
+                                   Error **errp)
 {
+    /* FIXME: QMP outputs values larger than INT64_MAX as negative */
     QmpOutputVisitor *qov = to_qov(v);
     qmp_output_add(qov, name, qint_from_int(*obj));
 }
 
-static void qmp_output_type_bool(Visitor *v, bool *obj, const char *name,
+static void qmp_output_type_bool(Visitor *v, const char *name, bool *obj,
                                  Error **errp)
 {
     QmpOutputVisitor *qov = to_qov(v);
     qmp_output_add(qov, name, qbool_from_bool(*obj));
 }
 
-static void qmp_output_type_str(Visitor *v, char **obj, const char *name,
+static void qmp_output_type_str(Visitor *v, const char *name, char **obj,
                                 Error **errp)
 {
     QmpOutputVisitor *qov = to_qov(v);
@@ -184,14 +180,14 @@ static void qmp_output_type_str(Visitor *v, char **obj, const char *name,
     }
 }
 
-static void qmp_output_type_number(Visitor *v, double *obj, const char *name,
+static void qmp_output_type_number(Visitor *v, const char *name, double *obj,
                                    Error **errp)
 {
     QmpOutputVisitor *qov = to_qov(v);
     qmp_output_add(qov, name, qfloat_from_double(*obj));
 }
 
-static void qmp_output_type_any(Visitor *v, QObject **obj, const char *name,
+static void qmp_output_type_any(Visitor *v, const char *name, QObject **obj,
                                 Error **errp)
 {
     QmpOutputVisitor *qov = to_qov(v);
@@ -199,11 +195,16 @@ static void qmp_output_type_any(Visitor *v, QObject **obj, const char *name,
     qmp_output_add_obj(qov, name, *obj);
 }
 
+/* Finish building, and return the root object. Will not be NULL. */
 QObject *qmp_output_get_qobject(QmpOutputVisitor *qov)
 {
-    QObject *obj = qmp_output_first(qov);
+    /* FIXME: we should require that a visit occurred, and that it is
+     * complete (no starts without a matching end) */
+    QObject *obj = qov->root;
     if (obj) {
         qobject_incref(obj);
+    } else {
+        obj = qnull();
     }
     return obj;
 }
@@ -217,16 +218,12 @@ void qmp_output_visitor_cleanup(QmpOutputVisitor *v)
 {
     QStackEntry *e, *tmp;
 
-    /* The bottom QStackEntry, if any, owns the root QObject. See the
-     * qmp_output_push_obj() invocations in qmp_output_add_obj(). */
-    QObject *root = QTAILQ_EMPTY(&v->stack) ? NULL : qmp_output_first(v);
-
     QTAILQ_FOREACH_SAFE(e, &v->stack, node, tmp) {
         QTAILQ_REMOVE(&v->stack, e, node);
         g_free(e);
     }
 
-    qobject_decref(root);
+    qobject_decref(v->root);
     g_free(v);
 }
 
@@ -242,7 +239,8 @@ QmpOutputVisitor *qmp_output_visitor_new(void)
     v->visitor.next_list = qmp_output_next_list;
     v->visitor.end_list = qmp_output_end_list;
     v->visitor.type_enum = output_type_enum;
-    v->visitor.type_int = qmp_output_type_int;
+    v->visitor.type_int64 = qmp_output_type_int64;
+    v->visitor.type_uint64 = qmp_output_type_uint64;
     v->visitor.type_bool = qmp_output_type_bool;
     v->visitor.type_str = qmp_output_type_str;
     v->visitor.type_number = qmp_output_type_number;
diff --git a/qapi/string-input-visitor.c b/qapi/string-input-visitor.c
index 8c5ff7e..18b9339 100644
--- a/qapi/string-input-visitor.c
+++ b/qapi/string-input-visitor.c
@@ -1,7 +1,7 @@
 /*
  * String parsing visitor
  *
- * Copyright Red Hat, Inc. 2012
+ * Copyright Red Hat, Inc. 2012-2016
  *
  * Author: Paolo Bonzini <pbonzini@redhat.com>
  *
@@ -33,6 +33,11 @@ struct StringInputVisitor
     const char *string;
 };
 
+static StringInputVisitor *to_siv(Visitor *v)
+{
+    return container_of(v, StringInputVisitor, visitor);
+}
+
 static void free_range(void *range, void *dummy)
 {
     g_free(range);
@@ -121,7 +126,7 @@ error:
 static void
 start_list(Visitor *v, const char *name, Error **errp)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
 
     parse_str(siv, errp);
 
@@ -134,10 +139,9 @@ start_list(Visitor *v, const char *name, Error **errp)
     }
 }
 
-static GenericList *
-next_list(Visitor *v, GenericList **list, Error **errp)
+static GenericList *next_list(Visitor *v, GenericList **list)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
     GenericList **link;
     Range *r;
 
@@ -173,17 +177,16 @@ next_list(Visitor *v, GenericList **list, Error **errp)
     return *link;
 }
 
-static void
-end_list(Visitor *v, Error **errp)
+static void end_list(Visitor *v)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
     siv->head = true;
 }
 
-static void parse_type_int(Visitor *v, int64_t *obj, const char *name,
-                           Error **errp)
+static void parse_type_int64(Visitor *v, const char *name, int64_t *obj,
+                             Error **errp)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
 
     if (!siv->string) {
         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
@@ -222,10 +225,24 @@ error:
                "an int64 value or range");
 }
 
-static void parse_type_size(Visitor *v, uint64_t *obj, const char *name,
+static void parse_type_uint64(Visitor *v, const char *name, uint64_t *obj,
+                              Error **errp)
+{
+    /* FIXME: parse_type_int64 mishandles values over INT64_MAX */
+    int64_t i;
+    Error *err = NULL;
+    parse_type_int64(v, name, &i, &err);
+    if (err) {
+        error_propagate(errp, err);
+    } else {
+        *obj = i;
+    }
+}
+
+static void parse_type_size(Visitor *v, const char *name, uint64_t *obj,
                             Error **errp)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
     Error *err = NULL;
     uint64_t val;
 
@@ -244,10 +261,10 @@ static void parse_type_size(Visitor *v, uint64_t *obj, const char *name,
     *obj = val;
 }
 
-static void parse_type_bool(Visitor *v, bool *obj, const char *name,
+static void parse_type_bool(Visitor *v, const char *name, bool *obj,
                             Error **errp)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
 
     if (siv->string) {
         if (!strcasecmp(siv->string, "on") ||
@@ -268,10 +285,10 @@ static void parse_type_bool(Visitor *v, bool *obj, const char *name,
                "boolean");
 }
 
-static void parse_type_str(Visitor *v, char **obj, const char *name,
+static void parse_type_str(Visitor *v, const char *name, char **obj,
                            Error **errp)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
     if (siv->string) {
         *obj = g_strdup(siv->string);
     } else {
@@ -280,10 +297,10 @@ static void parse_type_str(Visitor *v, char **obj, const char *name,
     }
 }
 
-static void parse_type_number(Visitor *v, double *obj, const char *name,
+static void parse_type_number(Visitor *v, const char *name, double *obj,
                               Error **errp)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
     char *endp = (char *) siv->string;
     double val;
 
@@ -300,9 +317,9 @@ static void parse_type_number(Visitor *v, double *obj, const char *name,
     *obj = val;
 }
 
-static void parse_optional(Visitor *v, bool *present, const char *name)
+static void parse_optional(Visitor *v, const char *name, bool *present)
 {
-    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
+    StringInputVisitor *siv = to_siv(v);
 
     if (!siv->string) {
         *present = false;
@@ -331,7 +348,8 @@ StringInputVisitor *string_input_visitor_new(const char *str)
     v = g_malloc0(sizeof(*v));
 
     v->visitor.type_enum = input_type_enum;
-    v->visitor.type_int = parse_type_int;
+    v->visitor.type_int64 = parse_type_int64;
+    v->visitor.type_uint64 = parse_type_uint64;
     v->visitor.type_size = parse_type_size;
     v->visitor.type_bool = parse_type_bool;
     v->visitor.type_str = parse_type_str;
diff --git a/qapi/string-output-visitor.c b/qapi/string-output-visitor.c
index b04cec4..b980bd3 100644
--- a/qapi/string-output-visitor.c
+++ b/qapi/string-output-visitor.c
@@ -1,7 +1,7 @@
 /*
  * String printing Visitor
  *
- * Copyright Red Hat, Inc. 2012
+ * Copyright Red Hat, Inc. 2012-2016
  *
  * Author: Paolo Bonzini <pbonzini@redhat.com>
  *
@@ -67,6 +67,11 @@ struct StringOutputVisitor
     GList *ranges;
 };
 
+static StringOutputVisitor *to_sov(Visitor *v)
+{
+    return container_of(v, StringOutputVisitor, visitor);
+}
+
 static void string_output_set(StringOutputVisitor *sov, char *string)
 {
     if (sov->string) {
@@ -117,10 +122,10 @@ static void format_string(StringOutputVisitor *sov, Range *r, bool next,
     }
 }
 
-static void print_type_int(Visitor *v, int64_t *obj, const char *name,
-                           Error **errp)
+static void print_type_int64(Visitor *v, const char *name, int64_t *obj,
+                             Error **errp)
 {
-    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    StringOutputVisitor *sov = to_sov(v);
     GList *l;
 
     switch (sov->list_mode) {
@@ -193,10 +198,18 @@ static void print_type_int(Visitor *v, int64_t *obj, const char *name,
     }
 }
 
-static void print_type_size(Visitor *v, uint64_t *obj, const char *name,
-                           Error **errp)
+static void print_type_uint64(Visitor *v, const char *name, uint64_t *obj,
+                             Error **errp)
 {
-    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    /* FIXME: print_type_int64 mishandles values over INT64_MAX */
+    int64_t i = *obj;
+    print_type_int64(v, name, &i, errp);
+}
+
+static void print_type_size(Visitor *v, const char *name, uint64_t *obj,
+                            Error **errp)
+{
+    StringOutputVisitor *sov = to_sov(v);
     static const char suffixes[] = { 'B', 'K', 'M', 'G', 'T', 'P', 'E' };
     uint64_t div, val;
     char *out;
@@ -224,17 +237,17 @@ static void print_type_size(Visitor *v, uint64_t *obj, const char *name,
     string_output_set(sov, out);
 }
 
-static void print_type_bool(Visitor *v, bool *obj, const char *name,
+static void print_type_bool(Visitor *v, const char *name, bool *obj,
                             Error **errp)
 {
-    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    StringOutputVisitor *sov = to_sov(v);
     string_output_set(sov, g_strdup(*obj ? "true" : "false"));
 }
 
-static void print_type_str(Visitor *v, char **obj, const char *name,
+static void print_type_str(Visitor *v, const char *name, char **obj,
                            Error **errp)
 {
-    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    StringOutputVisitor *sov = to_sov(v);
     char *out;
 
     if (sov->human) {
@@ -245,17 +258,17 @@ static void print_type_str(Visitor *v, char **obj, const char *name,
     string_output_set(sov, out);
 }
 
-static void print_type_number(Visitor *v, double *obj, const char *name,
+static void print_type_number(Visitor *v, const char *name, double *obj,
                               Error **errp)
 {
-    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    StringOutputVisitor *sov = to_sov(v);
     string_output_set(sov, g_strdup_printf("%f", *obj));
 }
 
 static void
 start_list(Visitor *v, const char *name, Error **errp)
 {
-    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    StringOutputVisitor *sov = to_sov(v);
 
     /* we can't traverse a list in a list */
     assert(sov->list_mode == LM_NONE);
@@ -263,10 +276,9 @@ start_list(Visitor *v, const char *name, Error **errp)
     sov->head = true;
 }
 
-static GenericList *
-next_list(Visitor *v, GenericList **list, Error **errp)
+static GenericList *next_list(Visitor *v, GenericList **list)
 {
-    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    StringOutputVisitor *sov = to_sov(v);
     GenericList *ret = NULL;
     if (*list) {
         if (sov->head) {
@@ -290,10 +302,9 @@ next_list(Visitor *v, GenericList **list, Error **errp)
     return ret;
 }
 
-static void
-end_list(Visitor *v, Error **errp)
+static void end_list(Visitor *v)
 {
-    StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
+    StringOutputVisitor *sov = to_sov(v);
 
     assert(sov->list_mode == LM_STARTED ||
            sov->list_mode == LM_END ||
@@ -341,7 +352,8 @@ StringOutputVisitor *string_output_visitor_new(bool human)
     v->string = g_string_new(NULL);
     v->human = human;
     v->visitor.type_enum = output_type_enum;
-    v->visitor.type_int = print_type_int;
+    v->visitor.type_int64 = print_type_int64;
+    v->visitor.type_uint64 = print_type_uint64;
     v->visitor.type_size = print_type_size;
     v->visitor.type_bool = print_type_bool;
     v->visitor.type_str = print_type_str;