Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2018-06-22' into staging

QAPI patches for 2018-06-22

# gpg: Signature made Fri 22 Jun 2018 15:36:22 BST
# gpg:                using RSA key 3870B400EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-qapi-2018-06-22:
  MAINTAINERS: Update QAPI stanza for commit fb0bc835e56
  qapi/introspect: Eliminate pointless variable in .visit_end()
  Revert commit d4e5ec877ca
  qapi: Open files with encoding='utf-8'
  qapi: remove empty flat union branches and types
  qapi: allow empty branches in flat unions
  tests: Add QDict clone-flatten test
  qdict: Make qdict_flatten() shallow-clone-friendly
  qapi/events: generate event enum in main module
  qapi/visit: remove useless prefix argument

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

5 files changed, 43 insertions, 22 deletions

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 2462fc0..8b6708d 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -16,6 +16,7 @@ import errno
 import os
 import re
 import string
+import sys
 from collections import OrderedDict
 
 builtin_types = {
@@ -340,7 +341,10 @@ class QAPISchemaParser(object):
             return None
 
         try:
-            fobj = open(incl_fname, 'r')
+            if sys.version_info[0] >= 3:
+                fobj = open(incl_fname, 'r', encoding='utf-8')
+            else:
+                fobj = open(incl_fname, 'r')
         except IOError as e:
             raise QAPISemError(info, '%s: %s' % (e.strerror, incl_fname))
         return QAPISchemaParser(fobj, previously_included, info)
@@ -779,13 +783,6 @@ def check_union(expr, info):
                                    "enum '%s'"
                                    % (key, enum_define['enum']))
 
-    # If discriminator is user-defined, ensure all values are covered
-    if enum_define:
-        for value in enum_define['data']:
-            if value not in members.keys():
-                raise QAPISemError(info, "Union '%s' data missing '%s' branch"
-                                   % (name, value))
-
 
 def check_alternate(expr, info):
     name = expr['alternate']
@@ -1357,6 +1354,14 @@ class QAPISchemaObjectTypeVariants(object):
             self.tag_member = seen[c_name(self._tag_name)]
             assert self._tag_name == self.tag_member.name
         assert isinstance(self.tag_member.type, QAPISchemaEnumType)
+        if self._tag_name:    # flat union
+            # branches that are not explicitly covered get an empty type
+            cases = set([v.name for v in self.variants])
+            for val in self.tag_member.type.values:
+                if val.name not in cases:
+                    v = QAPISchemaObjectTypeVariant(val.name, 'q_empty')
+                    v.set_owner(self.tag_member.owner)
+                    self.variants.append(v)
         for v in self.variants:
             v.check(schema)
             # Union names must match enum values; alternate names are
@@ -1492,7 +1497,11 @@ class QAPISchemaEvent(QAPISchemaEntity):
 class QAPISchema(object):
     def __init__(self, fname):
         self._fname = fname
-        parser = QAPISchemaParser(open(fname, 'r'))
+        if sys.version_info[0] >= 3:
+            f = open(fname, 'r', encoding='utf-8')
+        else:
+            f = open(fname, 'r')
+        parser = QAPISchemaParser(f)
         exprs = check_exprs(parser.exprs)
         self.docs = parser.docs
         self._entity_list = []
@@ -2006,7 +2015,10 @@ class QAPIGen(object):
                 if e.errno != errno.EEXIST:
                     raise
         fd = os.open(pathname, os.O_RDWR | os.O_CREAT, 0o666)
-        f = os.fdopen(fd, 'r+')
+        if sys.version_info[0] >= 3:
+            f = open(fd, 'r+', encoding='utf-8')
+        else:
+            f = os.fdopen(fd, 'r+')
         text = (self._top(fname) + self._preamble + self._body
                 + self._bottom(fname))
         oldtext = f.read(len(text) + 1)
diff --git a/scripts/qapi/events.py b/scripts/qapi/events.py
index 4426861..5657524 100644
--- a/scripts/qapi/events.py
+++ b/scripts/qapi/events.py
@@ -180,8 +180,9 @@ class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor):
                              types=types))
 
     def visit_end(self):
-        self._genh.add(gen_enum(self._enum_name, self._event_names))
-        self._genc.add(gen_enum_lookup(self._enum_name, self._event_names))
+        (genc, genh) = self._module[self._main_module]
+        genh.add(gen_enum(self._enum_name, self._event_names))
+        genc.add(gen_enum_lookup(self._enum_name, self._event_names))
 
     def visit_event(self, name, info, arg_type, boxed):
         self._genh.add(gen_event_send_decl(name, arg_type, boxed))
diff --git a/scripts/qapi/introspect.py b/scripts/qapi/introspect.py
index 5b6c72c..6ad198a 100644
--- a/scripts/qapi/introspect.py
+++ b/scripts/qapi/introspect.py
@@ -75,13 +75,10 @@ class QAPISchemaGenIntrospectVisitor(QAPISchemaMonolithicCVisitor):
 
     def visit_end(self):
         # visit the types that are actually used
-        qlits = self._qlits
-        self._qlits = []
         for typ in self._used_types:
             typ.visit(self)
         # generate C
         # TODO can generate awfully long lines
-        qlits.extend(self._qlits)
         name = c_name(self._prefix, protect=False) + 'qmp_schema_qlit'
         self._genh.add(mcgen('''
 #include "qapi/qmp/qlit.h"
@@ -93,7 +90,7 @@ extern const QLitObject %(c_name)s;
 const QLitObject %(c_name)s = %(c_string)s;
 ''',
                              c_name=c_name(name),
-                             c_string=to_qlit(qlits)))
+                             c_string=to_qlit(self._qlits)))
         self._schema = None
         self._qlits = []
         self._used_types = []
diff --git a/scripts/qapi/types.py b/scripts/qapi/types.py
index 64d9c0f..a599352 100644
--- a/scripts/qapi/types.py
+++ b/scripts/qapi/types.py
@@ -125,6 +125,8 @@ def gen_variants(variants):
                 c_name=c_name(variants.tag_member.name))
 
     for var in variants.variants:
+        if var.type.name == 'q_empty':
+            continue
         ret += mcgen('''
         %(c_type)s %(c_name)s;
 ''',
diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py
index 5d72d89..bdcafb6 100644
--- a/scripts/qapi/visit.py
+++ b/scripts/qapi/visit.py
@@ -81,15 +81,24 @@ void visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp)
                      c_name=c_name(variants.tag_member.name))
 
         for var in variants.variants:
-            ret += mcgen('''
+            case_str = c_enum_const(variants.tag_member.type.name,
+                                    var.name,
+                                    variants.tag_member.type.prefix)
+            if var.type.name == 'q_empty':
+                # valid variant and nothing to do
+                ret += mcgen('''
+    case %(case)s:
+        break;
+''',
+                             case=case_str)
+            else:
+                ret += mcgen('''
     case %(case)s:
         visit_type_%(c_type)s_members(v, &obj->u.%(c_name)s, &err);
         break;
 ''',
-                         case=c_enum_const(variants.tag_member.type.name,
-                                           var.name,
-                                           variants.tag_member.type.prefix),
-                         c_type=var.type.c_name(), c_name=c_name(var.name))
+                             case=case_str,
+                             c_type=var.type.c_name(), c_name=c_name(var.name))
 
         ret += mcgen('''
     default:
@@ -293,7 +302,7 @@ class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
 #include "qapi/qmp/qerror.h"
 #include "%(visit)s.h"
 ''',
-                                      visit=visit, prefix=self._prefix))
+                                      visit=visit))
         self._genh.preamble_add(mcgen('''
 #include "qapi/qapi-builtin-visit.h"
 #include "%(types)s.h"