Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2016-02-19' into staging

QAPI patches for 2016-02-19

# gpg: Signature made Fri 19 Feb 2016 10:10:18 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-2016-02-19:
  qapi: Change visit_start_implicit_struct to visit_start_alternate
  qapi: Don't box branches of flat unions
  qapi: Don't box struct branch of alternate
  qapi-visit: Use common idiom in gen_visit_fields_decl()
  qapi: Emit structs used as variants in topological order
  qapi: Adjust layout of FooList types
  qapi-visit: Less indirection in visit_type_Foo_fields()
  qapi-visit: Unify struct and union visit
  qapi: Visit variants in visit_type_FOO_fields()
  qapi-visit: Simplify how we visit common union members
  qapi: Add tests of complex objects within alternate
  qapi: Forbid 'any' inside an alternate
  qapi: Forbid empty unions and useless alternates
  qapi: Simplify excess input reporting in input visitors
  qapi-visit: Honor prefix of discriminator enum

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

1 files changed, 24 insertions, 9 deletions

diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index 7b0dca8c72..eac90d2fe9 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -2,7 +2,7 @@
 # QAPI types generator
 #
 # Copyright IBM, Corp. 2011
-# Copyright (c) 2013-2015 Red Hat Inc.
+# Copyright (c) 2013-2016 Red Hat Inc.
 #
 # Authors:
 #  Anthony Liguori <aliguori@us.ibm.com>
@@ -14,6 +14,11 @@
 from qapi import *
 
 
+# variants must be emitted before their container; track what has already
+# been output
+objects_seen = set()
+
+
 def gen_fwd_object_or_array(name):
     return mcgen('''
 
@@ -26,11 +31,8 @@ def gen_array(name, element_type):
     return mcgen('''
 
 struct %(c_name)s {
-    union {
-        %(c_type)s value;
-        uint64_t padding;
-    };
     %(c_name)s *next;
+    %(c_type)s value;
 };
 ''',
                  c_name=c_name(name), c_type=element_type.c_type())
@@ -52,11 +54,23 @@ def gen_struct_fields(members):
 
 
 def gen_object(name, base, members, variants):
-    ret = mcgen('''
+    if name in objects_seen:
+        return ''
+    objects_seen.add(name)
+
+    ret = ''
+    if variants:
+        for v in variants.variants:
+            if (isinstance(v.type, QAPISchemaObjectType) and
+                    not v.type.is_implicit()):
+                ret += gen_object(v.type.name, v.type.base,
+                                  v.type.local_members, v.type.variants)
+
+    ret += mcgen('''
 
 struct %(c_name)s {
 ''',
-                c_name=c_name(name))
+                 c_name=c_name(name))
 
     if base:
         ret += mcgen('''
@@ -118,11 +132,12 @@ def gen_variants(variants):
 
     for var in variants.variants:
         # Ugly special case for simple union TODO get rid of it
-        typ = var.simple_union_type() or var.type
+        simple_union_type = var.simple_union_type()
+        typ = simple_union_type or var.type
         ret += mcgen('''
         %(c_type)s %(c_name)s;
 ''',
-                     c_type=typ.c_type(),
+                     c_type=typ.c_type(is_unboxed=not simple_union_type),
                      c_name=c_name(var.name))
 
     ret += mcgen('''