[Qemu-devel] [PATCH v6 13/16] qapi: Consistent generated code: prefer common indentation

[Eric Blake <eblake@redhat.com>]

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 patch 4/4, focusing on adjusting 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>

---
v6: split 9/46 into four patches, update docs where they are affected,
rebase with 7/46 placed later in series

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 scripts/qapi-visit.py | 53 ++++++++++++++++++++++++++-------------------------
 1 file changed, 27 insertions(+), 26 deletions(-)

diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index a5d7be1..3b1e7b0 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);
-- 
2.4.3