qapi: Simplify QAPISchemaModularCVisitor

Since the previous commit, QAPISchemaVisitor.visit_module() is called
just once.  Simplify QAPISchemaModularCVisitor accordingly.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20191120182551.23795-7-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

scripts/qapi/commands.py

@@ -239,7 +239,7 @@ class QAPISchemaGenCommandVisitor(QAPISchemaModularCVisitor):
     def __init__(self, prefix):
         QAPISchemaModularCVisitor.__init__(
             self, prefix, 'qapi-commands',
-            ' * Schema-defined QAPI/QMP commands', __doc__)
+            ' * Schema-defined QAPI/QMP commands', None, __doc__)
         self._regy = QAPIGenCCode(None)
         self._visited_ret_types = {}
 

scripts/qapi/events.py

@@ -140,7 +140,7 @@ class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor):
     def __init__(self, prefix):
         QAPISchemaModularCVisitor.__init__(
             self, prefix, 'qapi-events',
-            ' * Schema-defined QAPI/QMP events', __doc__)
+            ' * Schema-defined QAPI/QMP events', None, __doc__)
         self._event_enum_name = c_name(prefix + 'QAPIEvent', protect=False)
         self._event_enum_members = []
         self._event_emit_name = c_name(prefix + 'qapi_event_emit')

scripts/qapi/gen.py

@@ -201,10 +201,11 @@ def write(self, output_dir):
 
 class QAPISchemaModularCVisitor(QAPISchemaVisitor):
 
-    def __init__(self, prefix, what, blurb, pydoc):
+    def __init__(self, prefix, what, user_blurb, builtin_blurb, pydoc):
         self._prefix = prefix
         self._what = what
-        self._blurb = blurb
+        self._user_blurb = user_blurb
+        self._builtin_blurb = builtin_blurb
         self._pydoc = pydoc
         self._genc = None
         self._genh = None
@@ -245,7 +246,7 @@ def _add_module(self, name, blurb):
         genc = QAPIGenC(basename + '.c', blurb, self._pydoc)
         genh = QAPIGenH(basename + '.h', blurb, self._pydoc)
         self._module[name] = (genc, genh)
-        self._set_module(name)
+        self._genc, self._genh = self._module[name]
 
     def _add_user_module(self, name, blurb):
         assert self._is_user_module(name)
@@ -256,9 +257,6 @@ def _add_user_module(self, name, blurb):
     def _add_system_module(self, name, blurb):
         self._add_module(name and './' + name, blurb)
 
-    def _set_module(self, name):
-        self._genc, self._genh = self._module[name]
-
     def write(self, output_dir, opt_builtins=False):
         for name in self._module:
             if self._is_builtin_module(name) and not opt_builtins:
@@ -271,15 +269,17 @@ def _begin_user_module(self, name):
         pass
 
     def visit_module(self, name):
-        if name in self._module:
-            self._set_module(name)
-        elif self._is_builtin_module(name):
-            # The built-in module has not been created.  No code may
-            # be generated.
-            self._genc = None
-            self._genh = None
+        if name is None:
+            if self._builtin_blurb:
+                self._add_system_module(None, self._builtin_blurb)
+                self._begin_system_module(name)
+            else:
+                # The built-in module has not been created.  No code may
+                # be generated.
+                self._genc = None
+                self._genh = None
         else:
-            self._add_user_module(name, self._blurb)
+            self._add_user_module(name, self._user_blurb)
             self._begin_user_module(name)
 
     def visit_include(self, name, info):

scripts/qapi/types.py

@@ -243,8 +243,9 @@ class QAPISchemaGenTypeVisitor(QAPISchemaModularCVisitor):
     def __init__(self, prefix):
         QAPISchemaModularCVisitor.__init__(
             self, prefix, 'qapi-types', ' * Schema-defined QAPI types',
-            __doc__)
-        self._add_system_module(None, ' * Built-in QAPI types')
+            ' * Built-in QAPI types', __doc__)
+
+    def _begin_system_module(self, name):
         self._genc.preamble_add(mcgen('''
 #include "qemu/osdep.h"
 #include "qapi/dealloc-visitor.h"

scripts/qapi/visit.py

@@ -285,8 +285,9 @@ class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
     def __init__(self, prefix):
         QAPISchemaModularCVisitor.__init__(
             self, prefix, 'qapi-visit', ' * Schema-defined QAPI visitors',
-            __doc__)
-        self._add_system_module(None, ' * Built-in QAPI visitors')
+            ' * Built-in QAPI visitors', __doc__)
+
+    def _begin_system_module(self, name):
         self._genc.preamble_add(mcgen('''
 #include "qemu/osdep.h"
 #include "qapi/error.h"
@@ -296,8 +297,7 @@ def __init__(self, prefix):
 #include "qapi/visitor.h"
 #include "qapi/qapi-builtin-types.h"
 
-''',
-                                      prefix=prefix))
+'''))
 
     def _begin_user_module(self, name):
         types = self._module_basename('qapi-types', name)