qapi: Reduce use of global variables in generators some

In preparation of the next commit, which will turn the generators into
modules.  These global variables will become local to main() then.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180211093607.27351-7-armbru@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 9 insertions, 8 deletions

diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 51eeaa1fc2..d5ca480421 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -264,7 +264,8 @@ out:
 
 
 class QAPISchemaGenVisitVisitor(QAPISchemaVisitor):
-    def __init__(self):
+    def __init__(self, opt_builtins):
+        self._opt_builtins = opt_builtins
         self.decl = None
         self.defn = None
         self._btin = None
@@ -277,7 +278,7 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor):
     def visit_end(self):
         # To avoid header dependency hell, we always generate
         # declarations for built-in types in our header files and
-        # simply guard them.  See also do_builtins (command line
+        # simply guard them.  See also opt_builtins (command line
         # option -b).
         self._btin += guardend('QAPI_VISIT_BUILTIN')
         self.decl = self._btin + self.decl
@@ -288,7 +289,7 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor):
         # TODO use something cleaner than existence of info
         if not info:
             self._btin += gen_visit_decl(name, scalar=True)
-            if do_builtins:
+            if self._opt_builtins:
                 self.defn += gen_visit_enum(name)
         else:
             self.decl += gen_visit_decl(name, scalar=True)
@@ -299,7 +300,7 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor):
         defn = gen_visit_list(name, element_type)
         if isinstance(element_type, QAPISchemaBuiltinType):
             self._btin += decl
-            if do_builtins:
+            if self._opt_builtins:
                 self.defn += defn
         else:
             self.decl += decl
@@ -324,16 +325,16 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor):
 
 # If you link code generated from multiple schemata, you want only one
 # instance of the code for built-in types.  Generate it only when
-# do_builtins, enabled by command line option -b.  See also
+# opt_builtins, enabled by command line option -b.  See also
 # QAPISchemaGenVisitVisitor.visit_end().
-do_builtins = False
+opt_builtins = False
 
 (input_file, output_dir, do_c, do_h, prefix, opts) = \
     parse_command_line('b', ['builtins'])
 
 for o, a in opts:
     if o in ('-b', '--builtins'):
-        do_builtins = True
+        opt_builtins = True
 
 blurb = ' * Schema-defined QAPI visitors'
 
@@ -357,7 +358,7 @@ genh.add(mcgen('''
                prefix=prefix))
 
 schema = QAPISchema(input_file)
-vis = QAPISchemaGenVisitVisitor()
+vis = QAPISchemaGenVisitVisitor(opt_builtins)
 schema.visit(vis)
 genc.add(vis.defn)
 genh.add(vis.decl)