[Qemu-devel] [PATCH RFC v4 12/29] qapi: Use consistent generated code patterns

[Eric Blake <eblake@redhat.com>]

We had a pointless difference in label names, and on whether
the generated code used:
    if (*obj) {
        stuff;
	...
    }
vs.
    if (!*obj) {
        goto out_obj;
    }
    stuff;
    ...

Pick a single style, as it will make it easier for later patches
to uniformly apply any updates to generated code.

No change in semantics to the generated code.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 scripts/qapi-visit.py | 47 ++++++++++++++++++++++++-----------------------
 1 file changed, 24 insertions(+), 23 deletions(-)

diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 5d4fb3a..d968642 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -215,7 +215,7 @@ void visit_type_%(c_name)s(Visitor *m, %(c_name)s **obj, const char *name, Error
     }
     visit_get_next_type(m, &(*obj)->type, %(promote_int)s, name, &err);
     if (err) {
-        goto out_end;
+        goto out_obj;
     }
     switch ((*obj)->type) {
 ''',
@@ -236,7 +236,7 @@ void visit_type_%(c_name)s(Visitor *m, %(c_name)s **obj, const char *name, Error
         error_setg(&err, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
                    "%(name)s");
     }
-out_end:
+out_obj:
     visit_end_implicit_struct(m, err ? NULL : &err);
 out:
     error_propagate(errp, err);
@@ -269,30 +269,32 @@ void visit_type_%(c_name)s(Visitor *m, %(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)

     tag_key = variants.tag_member.name
     if base:
         ret += mcgen('''
-        visit_type_%(c_name)s_fields(m, (%(c_name)s **)obj, &err);
+    visit_type_%(c_name)s_fields(m, (%(c_name)s **)obj, &err);
 ''',
                      c_name=c_name(base.name))
     else:
         ret += mcgen('''
-        visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, "%(name)s", &err);
+    visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, "%(name)s", &err);
 ''',
                      c_type=variants.tag_member.type.c_name(),
                      c_name=c_name(tag_key), name=tag_key)
     ret += mcgen('''
-        if (err) {
-            goto out_obj;
-        }
-        if (!visit_start_union(m, !!(*obj)->data, &err) || err) {
-            goto out_obj;
-        }
-        switch ((*obj)->%(c_name)s) {
+    if (err) {
+        goto out_obj;
+    }
+    if (!visit_start_union(m, !!(*obj)->data, &err) || err) {
+        goto out_obj;
+    }
+    switch ((*obj)->%(c_name)s) {
 ''',
                  c_name=c_name(tag_key))

@@ -300,35 +302,34 @@ void visit_type_%(c_name)s(Visitor *m, %(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(m, &(*obj)->%(c_name)s, "data", &err);
+        visit_type_%(c_type)s(m, &(*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(m, &(*obj)->%(c_name)s, &err);
+        visit_type_implicit_%(c_type)s(m, &(*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(m, !!(*obj)->data, &err);
+    default:
+        abort();
     }
+out_obj:
+    error_propagate(errp, err);
+    err = NULL;
+    visit_end_union(m, !!(*obj)->data, &err);
     visit_end_struct(m, err ? NULL : &err);
 out:
     error_propagate(errp, err);
-- 
2.4.3