qapi: Consistent generated code: prefer common indentation

We had some pointless differences in the generated code for visit,
command marshalling, and events; unifying them makes it easier for
future patches to consolidate to common helper functions.
This is one patch of a series to clean up these differences.

This patch adjusts gen_visit_union() to use the same indentation
as other functions, namely, by jumping early to the error label
if the object was not set rather than placing the rest of the
body inside an if for when it is set.

No change in semantics to the generated code.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1443565276-4535-14-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 27 insertions, 26 deletions

diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 5a453ea021..fe9780e0fa 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -264,16 +264,18 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error
     if (err) {
         goto out;
     }
-    if (*obj) {
+    if (!*obj) {
+        goto out_obj;
+    }
 ''',
                  c_name=c_name(name), name=name)
 
     if base:
         ret += mcgen('''
-        visit_type_%(c_name)s_fields(v, obj, &err);
-        if (err) {
-            goto out_obj;
-        }
+    visit_type_%(c_name)s_fields(v, obj, &err);
+    if (err) {
+        goto out_obj;
+    }
 ''',
                      c_name=c_name(name))
 
@@ -282,14 +284,14 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error
         # we pointlessly use a different key for simple unions
         tag_key = 'type'
     ret += mcgen('''
-        visit_type_%(c_type)s(v, &(*obj)->%(c_name)s, "%(name)s", &err);
-        if (err) {
-            goto out_obj;
-        }
-        if (!visit_start_union(v, !!(*obj)->data, &err) || err) {
-            goto out_obj;
-        }
-        switch ((*obj)->%(c_name)s) {
+    visit_type_%(c_type)s(v, &(*obj)->%(c_name)s, "%(name)s", &err);
+    if (err) {
+        goto out_obj;
+    }
+    if (!visit_start_union(v, !!(*obj)->data, &err) || err) {
+        goto out_obj;
+    }
+    switch ((*obj)->%(c_name)s) {
 ''',
                  c_type=variants.tag_member.type.c_name(),
                  # TODO ugly special case for simple union
@@ -302,37 +304,36 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error
         # TODO ugly special case for simple union
         simple_union_type = var.simple_union_type()
         ret += mcgen('''
-        case %(case)s:
+    case %(case)s:
 ''',
                      case=c_enum_const(variants.tag_member.type.name,
                                        var.name))
         if simple_union_type:
             ret += mcgen('''
-            visit_type_%(c_type)s(v, &(*obj)->%(c_name)s, "data", &err);
+        visit_type_%(c_type)s(v, &(*obj)->%(c_name)s, "data", &err);
 ''',
                          c_type=simple_union_type.c_name(),
                          c_name=c_name(var.name))
         else:
             ret += mcgen('''
-            visit_type_implicit_%(c_type)s(v, &(*obj)->%(c_name)s, &err);
+        visit_type_implicit_%(c_type)s(v, &(*obj)->%(c_name)s, &err);
 ''',
                          c_type=var.type.c_name(),
                          c_name=c_name(var.name))
         ret += mcgen('''
-            break;
+        break;
 ''')
 
     ret += mcgen('''
-        default:
-            abort();
-        }
-out_obj:
-        error_propagate(errp, err);
-        err = NULL;
-        visit_end_union(v, !!(*obj)->data, &err);
-        error_propagate(errp, err);
-        err = NULL;
+    default:
+        abort();
     }
+out_obj:
+    error_propagate(errp, err);
+    err = NULL;
+    visit_end_union(v, !!(*obj)->data, &err);
+    error_propagate(errp, err);
+    err = NULL;
     visit_end_struct(v, &err);
 out:
     error_propagate(errp, err);