qapi: Generate QAPIEvent stuff into separate files

Having to include qapi-events.h just for QAPIEvent is suboptimal, but
quite tolerable now.  It'll become problematic when we have events
conditional on the target, because then qapi-events.h won't be usable
from target-independent code anymore.  Avoid that by generating it
into separate files.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190214152251.2073-6-armbru@redhat.com>

.gitignore

@@ -32,6 +32,7 @@
 /qapi/qapi-builtin-visit.[ch]
 /qapi/qapi-commands-*.[ch]
 /qapi/qapi-commands.[ch]
+/qapi/qapi-emit-events.[ch]
 /qapi/qapi-events-*.[ch]
 /qapi/qapi-events.[ch]
 /qapi/qapi-introspect.[ch]

Makefile

@@ -101,6 +101,7 @@ GENERATED_QAPI_FILES += $(QAPI_MODULES:%=qapi/qapi-visit-%.c)
 GENERATED_QAPI_FILES += qapi/qapi-commands.h qapi/qapi-commands.c
 GENERATED_QAPI_FILES += $(QAPI_MODULES:%=qapi/qapi-commands-%.h)
 GENERATED_QAPI_FILES += $(QAPI_MODULES:%=qapi/qapi-commands-%.c)
+GENERATED_QAPI_FILES += qapi/qapi-emit-events.h qapi/qapi-emit-events.c
 GENERATED_QAPI_FILES += qapi/qapi-events.h qapi/qapi-events.c
 GENERATED_QAPI_FILES += $(QAPI_MODULES:%=qapi/qapi-events-%.h)
 GENERATED_QAPI_FILES += $(QAPI_MODULES:%=qapi/qapi-events-%.c)

Makefile.objs

@@ -12,6 +12,7 @@ util-obj-y += $(QAPI_MODULES:%=qapi/qapi-types-%.o)
 util-obj-y += qapi/qapi-builtin-visit.o
 util-obj-y += qapi/qapi-visit.o
 util-obj-y += $(QAPI_MODULES:%=qapi/qapi-visit-%.o)
+util-obj-y += qapi/qapi-emit-events.o
 util-obj-y += qapi/qapi-events.o
 util-obj-y += $(QAPI_MODULES:%=qapi/qapi-events-%.o)
 util-obj-y += qapi/qapi-introspect.o

docs/devel/qapi-code-gen.txt

@@ -1381,11 +1381,15 @@ qapi_event_send_EVENT().
 
 The following files are created:
 
-$(prefix)qapi-events.h - Function prototypes for each event type, plus an
+$(prefix)qapi-events.h - Function prototypes for each event type
-                        enumeration of all event names
 
 $(prefix)qapi-events.c - Implementation of functions to send an event
 
+$(prefix)qapi-emit-events.h - Enumeration of all event names, and
+                              common event code declarations
+
+$(prefix)qapi-emit-events.c - Common event code definitions
+
 Example:
 
     $ cat qapi-generated/example-qapi-events.h
@@ -1397,21 +1401,8 @@ Example:
     #include "qapi/util.h"
     #include "example-qapi-types.h"
 
-
     void qapi_event_send_my_event(void);
 
-    typedef enum example_QAPIEvent {
-        EXAMPLE_QAPI_EVENT_MY_EVENT,
-        EXAMPLE_QAPI_EVENT__MAX,
-    } example_QAPIEvent;
-
-    #define example_QAPIEvent_str(val) \
-        qapi_enum_lookup(&example_QAPIEvent_lookup, (val))
-
-    extern const QEnumLookup example_QAPIEvent_lookup;
-
-    void example_qapi_event_emit(example_QAPIEvent event, QDict *qdict);
-
     #endif /* EXAMPLE_QAPI_EVENTS_H */
     $ cat qapi-generated/example-qapi-events.c
 [Uninteresting stuff omitted...]
@@ -1427,6 +1418,31 @@ Example:
         qobject_unref(qmp);
     }
 
+[Uninteresting stuff omitted...]
+    $ cat qapi-generated/example-qapi-emit-events.h
+[Uninteresting stuff omitted...]
+
+    #ifndef EXAMPLE_QAPI_EMIT_EVENTS_H
+    #define EXAMPLE_QAPI_EMIT_EVENTS_H
+
+    #include "qapi/util.h"
+
+    typedef enum example_QAPIEvent {
+        EXAMPLE_QAPI_EVENT_MY_EVENT,
+        EXAMPLE_QAPI_EVENT__MAX,
+    } example_QAPIEvent;
+
+    #define example_QAPIEvent_str(val) \
+        qapi_enum_lookup(&example_QAPIEvent_lookup, (val))
+
+    extern const QEnumLookup example_QAPIEvent_lookup;
+
+    void example_qapi_event_emit(example_QAPIEvent event, QDict *qdict);
+
+    #endif /* EXAMPLE_QAPI_EMIT_EVENTS_H */
+    $ cat qapi-generated/example-qapi-emit-events.c
+[Uninteresting stuff omitted...]
+
     const QEnumLookup example_QAPIEvent_lookup = {
         .array = (const char *const[]) {
             [EXAMPLE_QAPI_EVENT_MY_EVENT] = "MY_EVENT",

monitor.c

@@ -75,7 +75,7 @@
 #include "qemu/thread.h"
 #include "block/qapi.h"
 #include "qapi/qapi-commands.h"
-#include "qapi/qapi-events.h"
+#include "qapi/qapi-emit-events.h"
 #include "qapi/error.h"
 #include "qapi/qmp-event.h"
 #include "qapi/qapi-introspect.h"

scripts/qapi/events.py

@@ -143,12 +143,14 @@ class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor):
         self._event_emit_name = c_name(prefix + 'qapi_event_emit')
 
     def _begin_user_module(self, name):
+        events = self._module_basename('qapi-events', name)
         types = self._module_basename('qapi-types', name)
         visit = self._module_basename('qapi-visit', name)
         self._genc.add(mcgen('''
 #include "qemu/osdep.h"
 #include "qemu-common.h"
-#include "%(prefix)sqapi-events.h"
+#include "%(prefix)sqapi-emit-events.h"
+#include "%(events)s.h"
 #include "%(visit)s.h"
 #include "qapi/error.h"
 #include "qapi/qmp/qdict.h"
@@ -156,21 +158,29 @@ class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor):
 #include "qapi/qmp-event.h"
 
 ''',
-                             visit=visit, prefix=self._prefix))
+                             events=events, visit=visit,
+                             prefix=self._prefix))
         self._genh.add(mcgen('''
 #include "qapi/util.h"
 #include "%(types)s.h"
-
 ''',
                              types=types))
 
     def visit_end(self):
-        (genc, genh) = self._module[self._main_module]
+        self._add_system_module('emit', ' * QAPI Events emission')
-        genh.add(gen_enum(self._event_enum_name,
+        self._genc.preamble_add(mcgen('''
+#include "qemu/osdep.h"
+#include "%(prefix)sqapi-emit-events.h"
+''',
+                                      prefix=self._prefix))
+        self._genh.preamble_add(mcgen('''
+#include "qapi/util.h"
+'''))
+        self._genh.add(gen_enum(self._event_enum_name,
                                 self._event_enum_members))
-        genc.add(gen_enum_lookup(self._event_enum_name,
+        self._genc.add(gen_enum_lookup(self._event_enum_name,
                                        self._event_enum_members))
-        genh.add(mcgen('''
+        self._genh.add(mcgen('''
 
 void %(event_emit)s(%(event_enum)s event, QDict *qdict);
 ''',

stubs/monitor.c

@@ -1,6 +1,6 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
-#include "qapi/qapi-events.h"
+#include "qapi/qapi-emit-events.h"
 #include "qemu-common.h"
 #include "monitor/monitor.h"
 

tests/test-qmp-event.c

@@ -21,6 +21,7 @@
 #include "qapi/qmp/qstring.h"
 #include "qapi/qmp-event.h"
 #include "test-qapi-events.h"
+#include "test-qapi-emit-events.h"
 
 typedef struct TestEventData {
     QDict *expect;

ui/vnc.c

@@ -35,7 +35,8 @@
 #include "qemu/timer.h"
 #include "qemu/acl.h"
 #include "qemu/config-file.h"
-#include "qapi/qapi-events.h"
+#include "qapi/qapi-emit-events.h"
+#include "qapi/qapi-events-ui.h"
 #include "qapi/error.h"
 #include "qapi/qapi-commands-ui.h"
 #include "ui/input.h"