qapi: Swap visit_* arguments for consistent 'name' placement

JSON uses "name":value, but many of our visitor interfaces were
called with visit_type_FOO(v, &value, name, errp).  This can be
a bit confusing to have to mentally swap the parameter order to
match JSON order.  It's particularly bad for visit_start_struct(),
where the 'name' parameter is smack in the middle of the
otherwise-related group of 'obj, kind, size' parameters! It's
time to do a global swap of the parameter ordering, so that the
'name' parameter is always immediately after the Visitor argument.

Additional reason in favor of the swap: the existing include/qjson.h
prefers listing 'name' first in json_prop_*(), and I have plans to
unify that file with the qapi visitors; listing 'name' first in
qapi will minimize churn to the (admittedly few) qjson.h clients.

Later patches will then fix docs, object.h, visitor-impl.h, and
those clients to match.

Done by first patching scripts/qapi*.py by hand to make generated
files do what I want, then by running the following Coccinelle
script to affect the rest of the code base:
 $ spatch --sp-file script `git grep -l '\bvisit_' -- '**/*.[ch]'`
I then had to apply some touchups (Coccinelle insisted on TAB
indentation in visitor.h, and botched the signature of
visit_type_enum() by rewriting 'const char *const strings[]' to
the syntactically invalid 'const char*const[] strings').  The
movement of parameters is sufficient to provoke compiler errors
if any callers were missed.

    // Part 1: Swap declaration order
    @@
    type TV, TErr, TObj, T1, T2;
    identifier OBJ, ARG1, ARG2;
    @@
     void visit_start_struct
    -(TV v, TObj OBJ, T1 ARG1, const char *name, T2 ARG2, TErr errp)
    +(TV v, const char *name, TObj OBJ, T1 ARG1, T2 ARG2, TErr errp)
     { ... }

    @@
    type bool, TV, T1;
    identifier ARG1;
    @@
     bool visit_optional
    -(TV v, T1 ARG1, const char *name)
    +(TV v, const char *name, T1 ARG1)
     { ... }

    @@
    type TV, TErr, TObj, T1;
    identifier OBJ, ARG1;
    @@
     void visit_get_next_type
    -(TV v, TObj OBJ, T1 ARG1, const char *name, TErr errp)
    +(TV v, const char *name, TObj OBJ, T1 ARG1, TErr errp)
     { ... }

    @@
    type TV, TErr, TObj, T1, T2;
    identifier OBJ, ARG1, ARG2;
    @@
     void visit_type_enum
    -(TV v, TObj OBJ, T1 ARG1, T2 ARG2, const char *name, TErr errp)
    +(TV v, const char *name, TObj OBJ, T1 ARG1, T2 ARG2, TErr errp)
     { ... }

    @@
    type TV, TErr, TObj;
    identifier OBJ;
    identifier VISIT_TYPE =~ "^visit_type_";
    @@
     void VISIT_TYPE
    -(TV v, TObj OBJ, const char *name, TErr errp)
    +(TV v, const char *name, TObj OBJ, TErr errp)
     { ... }

    // Part 2: swap caller order
    @@
    expression V, NAME, OBJ, ARG1, ARG2, ERR;
    identifier VISIT_TYPE =~ "^visit_type_";
    @@
    (
    -visit_start_struct(V, OBJ, ARG1, NAME, ARG2, ERR)
    +visit_start_struct(V, NAME, OBJ, ARG1, ARG2, ERR)
    |
    -visit_optional(V, ARG1, NAME)
    +visit_optional(V, NAME, ARG1)
    |
    -visit_get_next_type(V, OBJ, ARG1, NAME, ERR)
    +visit_get_next_type(V, NAME, OBJ, ARG1, ERR)
    |
    -visit_type_enum(V, OBJ, ARG1, ARG2, NAME, ERR)
    +visit_type_enum(V, NAME, OBJ, ARG1, ARG2, ERR)
    |
    -VISIT_TYPE(V, OBJ, NAME, ERR)
    +VISIT_TYPE(V, NAME, OBJ, ERR)
    )

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1454075341-13658-19-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 24 insertions, 25 deletions

diff --git a/qom/object.c b/qom/object.c
index 3506a98803..66cafacf9a 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -1244,8 +1244,8 @@ int object_property_get_enum(Object *obj, const char *name,
     str = string_output_get_string(sov);
     siv = string_input_visitor_new(str);
     string_output_visitor_cleanup(sov);
-    visit_type_enum(string_input_get_visitor(siv),
-                    &ret, enumprop->strings, NULL, name, errp);
+    visit_type_enum(string_input_get_visitor(siv), name, &ret,
+                    enumprop->strings, NULL, errp);
 
     g_free(str);
     string_input_visitor_cleanup(siv);
@@ -1270,8 +1270,7 @@ void object_property_get_uint16List(Object *obj, const char *name,
     }
     str = string_output_get_string(ov);
     iv = string_input_visitor_new(str);
-    visit_type_uint16List(string_input_get_visitor(iv),
-                          list, NULL, errp);
+    visit_type_uint16List(string_input_get_visitor(iv), NULL, list, errp);
 
     g_free(str);
     string_input_visitor_cleanup(iv);
@@ -1343,7 +1342,7 @@ static void object_get_child_property(Object *obj, Visitor *v, void *opaque,
     gchar *path;
 
     path = object_get_canonical_path(child);
-    visit_type_str(v, &path, name, errp);
+    visit_type_str(v, name, &path, errp);
     g_free(path);
 }
 
@@ -1414,11 +1413,11 @@ static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
 
     if (*child) {
         path = object_get_canonical_path(*child);
-        visit_type_str(v, &path, name, errp);
+        visit_type_str(v, name, &path, errp);
         g_free(path);
     } else {
         path = (gchar *)"";
-        visit_type_str(v, &path, name, errp);
+        visit_type_str(v, name, &path, errp);
     }
 }
 
@@ -1472,7 +1471,7 @@ static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
     Object *new_target = NULL;
     char *path = NULL;
 
-    visit_type_str(v, &path, name, &local_err);
+    visit_type_str(v, name, &path, &local_err);
 
     if (!local_err && strcmp(path, "") != 0) {
         new_target = object_resolve_link(obj, name, path, &local_err);
@@ -1739,7 +1738,7 @@ static void property_get_str(Object *obj, Visitor *v, void *opaque,
         return;
     }
 
-    visit_type_str(v, &value, name, errp);
+    visit_type_str(v, name, &value, errp);
     g_free(value);
 }
 
@@ -1750,7 +1749,7 @@ static void property_set_str(Object *obj, Visitor *v, void *opaque,
     char *value;
     Error *local_err = NULL;
 
-    visit_type_str(v, &value, name, &local_err);
+    visit_type_str(v, name, &value, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
@@ -1831,7 +1830,7 @@ static void property_get_bool(Object *obj, Visitor *v, void *opaque,
         return;
     }
 
-    visit_type_bool(v, &value, name, errp);
+    visit_type_bool(v, name, &value, errp);
 }
 
 static void property_set_bool(Object *obj, Visitor *v, void *opaque,
@@ -1841,7 +1840,7 @@ static void property_set_bool(Object *obj, Visitor *v, void *opaque,
     bool value;
     Error *local_err = NULL;
 
-    visit_type_bool(v, &value, name, &local_err);
+    visit_type_bool(v, name, &value, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
@@ -1914,7 +1913,7 @@ static void property_get_enum(Object *obj, Visitor *v, void *opaque,
         return;
     }
 
-    visit_type_enum(v, &value, prop->strings, NULL, name, errp);
+    visit_type_enum(v, name, &value, prop->strings, NULL, errp);
 }
 
 static void property_set_enum(Object *obj, Visitor *v, void *opaque,
@@ -1924,7 +1923,7 @@ static void property_set_enum(Object *obj, Visitor *v, void *opaque,
     int value;
     Error *err = NULL;
 
-    visit_type_enum(v, &value, prop->strings, NULL, name, &err);
+    visit_type_enum(v, name, &value, prop->strings, NULL, &err);
     if (err) {
         error_propagate(errp, err);
         return;
@@ -2005,31 +2004,31 @@ static void property_get_tm(Object *obj, Visitor *v, void *opaque,
         goto out;
     }
 
-    visit_start_struct(v, NULL, "struct tm", name, 0, &err);
+    visit_start_struct(v, name, NULL, "struct tm", 0, &err);
     if (err) {
         goto out;
     }
-    visit_type_int32(v, &value.tm_year, "tm_year", &err);
+    visit_type_int32(v, "tm_year", &value.tm_year, &err);
     if (err) {
         goto out_end;
     }
-    visit_type_int32(v, &value.tm_mon, "tm_mon", &err);
+    visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
     if (err) {
         goto out_end;
     }
-    visit_type_int32(v, &value.tm_mday, "tm_mday", &err);
+    visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
     if (err) {
         goto out_end;
     }
-    visit_type_int32(v, &value.tm_hour, "tm_hour", &err);
+    visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
     if (err) {
         goto out_end;
     }
-    visit_type_int32(v, &value.tm_min, "tm_min", &err);
+    visit_type_int32(v, "tm_min", &value.tm_min, &err);
     if (err) {
         goto out_end;
     }
-    visit_type_int32(v, &value.tm_sec, "tm_sec", &err);
+    visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
     if (err) {
         goto out_end;
     }
@@ -2097,7 +2096,7 @@ static void property_get_uint8_ptr(Object *obj, Visitor *v,
                                    Error **errp)
 {
     uint8_t value = *(uint8_t *)opaque;
-    visit_type_uint8(v, &value, name, errp);
+    visit_type_uint8(v, name, &value, errp);
 }
 
 static void property_get_uint16_ptr(Object *obj, Visitor *v,
@@ -2105,7 +2104,7 @@ static void property_get_uint16_ptr(Object *obj, Visitor *v,
                                    Error **errp)
 {
     uint16_t value = *(uint16_t *)opaque;
-    visit_type_uint16(v, &value, name, errp);
+    visit_type_uint16(v, name, &value, errp);
 }
 
 static void property_get_uint32_ptr(Object *obj, Visitor *v,
@@ -2113,7 +2112,7 @@ static void property_get_uint32_ptr(Object *obj, Visitor *v,
                                    Error **errp)
 {
     uint32_t value = *(uint32_t *)opaque;
-    visit_type_uint32(v, &value, name, errp);
+    visit_type_uint32(v, name, &value, errp);
 }
 
 static void property_get_uint64_ptr(Object *obj, Visitor *v,
@@ -2121,7 +2120,7 @@ static void property_get_uint64_ptr(Object *obj, Visitor *v,
                                    Error **errp)
 {
     uint64_t value = *(uint64_t *)opaque;
-    visit_type_uint64(v, &value, name, errp);
+    visit_type_uint64(v, name, &value, errp);
 }
 
 void object_property_add_uint8_ptr(Object *obj, const char *name,