qapi: Generate command registration stuff into separate files

Having to include qapi-commands.h just for qmp_init_marshal() is
suboptimal.  Generate it into separate files.  This lets
monitor/misc.c, qga/main.c, and the generated qapi-commands-FOO.h
include less.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20191120182551.23795-4-armbru@redhat.com>
[Typos in docs/devel/qapi-code-gen.txt fixed]
Reviewed-by: Eric Blake <eblake@redhat.com>

.gitignore

@@ -37,6 +37,7 @@
 /qapi/qapi-emit-events.[ch]
 /qapi/qapi-events-*.[ch]
 /qapi/qapi-events.[ch]
+/qapi/qapi-init-commands.[ch]
 /qapi/qapi-introspect.[ch]
 /qapi/qapi-types-*.[ch]
 /qapi/qapi-types.[ch]

Makefile

@@ -117,6 +117,7 @@ GENERATED_QAPI_FILES += qapi/qapi-builtin-visit.h qapi/qapi-builtin-visit.c
 GENERATED_QAPI_FILES += qapi/qapi-visit.h qapi/qapi-visit.c
 GENERATED_QAPI_FILES += $(QAPI_MODULES:%=qapi/qapi-visit-%.h)
 GENERATED_QAPI_FILES += $(QAPI_MODULES:%=qapi/qapi-visit-%.c)
+GENERATED_QAPI_FILES += qapi/qapi-init-commands.h qapi/qapi-init-commands.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)
@@ -601,6 +602,7 @@ $(SRC_PATH)/scripts/qapi-gen.py
 qga/qapi-generated/qga-qapi-types.c qga/qapi-generated/qga-qapi-types.h \
 qga/qapi-generated/qga-qapi-visit.c qga/qapi-generated/qga-qapi-visit.h \
 qga/qapi-generated/qga-qapi-commands.h qga/qapi-generated/qga-qapi-commands.c \
+qga/qapi-generated/qga-qapi-init-commands.h qga/qapi-generated/qga-qapi-init-commands.c \
 qga/qapi-generated/qga-qapi-doc.texi: \
 qga/qapi-generated/qapi-gen-timestamp ;
 qga/qapi-generated/qapi-gen-timestamp: $(SRC_PATH)/qga/qapi-schema.json $(qapi-py)
@@ -619,7 +621,7 @@ qapi-gen-timestamp: $(qapi-modules) $(qapi-py)
 		"GEN","$(@:%-timestamp=%)")
 	@>$@
 
-QGALIB_GEN=$(addprefix qga/qapi-generated/, qga-qapi-types.h qga-qapi-visit.h qga-qapi-commands.h)
+QGALIB_GEN=$(addprefix qga/qapi-generated/, qga-qapi-types.h qga-qapi-visit.h qga-qapi-commands.h qga-qapi-init-commands.h)
 $(qga-obj-y): $(QGALIB_GEN)
 
 qemu-ga$(EXESUF): $(qga-obj-y) $(COMMON_LDADDS)

docs/devel/qapi-code-gen.txt

@@ -1493,6 +1493,10 @@ $(prefix)qapi-commands.c: Command marshal/dispatch functions for each
 $(prefix)qapi-commands.h: Function prototypes for the QMP commands
                           specified in the schema
 
+$(prefix)qapi-init-commands.h - Command initialization prototype
+
+$(prefix)qapi-init-commands.c - Command initialization code
+
 Example:
 
     $ cat qapi-generated/example-qapi-commands.h
@@ -1502,11 +1506,9 @@ Example:
     #define EXAMPLE_QAPI_COMMANDS_H
 
     #include "example-qapi-types.h"
-    #include "qapi/qmp/dispatch.h"
 
     UserDefOne *qmp_my_command(UserDefOneList *arg1, Error **errp);
     void qmp_marshal_my_command(QDict *args, QObject **ret, Error **errp);
-    void example_qmp_init_marshal(QmpCommandList *cmds);
 
     #endif /* EXAMPLE_QAPI_COMMANDS_H */
     $ cat qapi-generated/example-qapi-commands.c
@@ -1566,7 +1568,19 @@ Example:
         visit_end_struct(v, NULL);
         visit_free(v);
     }
+[Uninteresting stuff omitted...]
+    $ cat qapi-generated/example-qapi-init-commands.h
+[Uninteresting stuff omitted...]
+    #ifndef EXAMPLE_QAPI_INIT_COMMANDS_H
+    #define EXAMPLE_QAPI_INIT_COMMANDS_H
 
+    #include "qapi/qmp/dispatch.h"
+
+    void example_qmp_init_marshal(QmpCommandList *cmds);
+
+    #endif /* EXAMPLE_QAPI_INIT_COMMANDS_H */
+    $ cat qapi-generated/example-qapi-init-commands.c
+[Uninteresting stuff omitted...]
     void example_qmp_init_marshal(QmpCommandList *cmds)
     {
         QTAILQ_INIT(cmds);
@@ -1574,7 +1588,6 @@ Example:
         qmp_register_command(cmds, "my-command",
                              qmp_marshal_my_command, QCO_NO_OPTIONS);
     }
-
 [Uninteresting stuff omitted...]
 
 For a modular QAPI schema (see section Include directives), code for

monitor/misc.c

@@ -66,8 +66,13 @@
 #include "qemu/option.h"
 #include "qemu/thread.h"
 #include "block/qapi.h"
-#include "qapi/qapi-commands.h"
+#include "qapi/qapi-commands-char.h"
+#include "qapi/qapi-commands-migration.h"
+#include "qapi/qapi-commands-misc.h"
+#include "qapi/qapi-commands-qom.h"
+#include "qapi/qapi-commands-trace.h"
 #include "qapi/qapi-emit-events.h"
+#include "qapi/qapi-init-commands.h"
 #include "qapi/error.h"
 #include "qapi/qmp-event.h"
 #include "qapi/qapi-introspect.h"

qapi/Makefile.objs

@@ -30,3 +30,4 @@ obj-y += $(QAPI_TARGET_MODULES:%=qapi-events-%.o)
 obj-y += qapi-events.o
 obj-y += $(QAPI_TARGET_MODULES:%=qapi-commands-%.o)
 obj-y += qapi-commands.o
+obj-y += qapi-init-commands.o

qga/Makefile.objs

@@ -5,5 +5,6 @@ qga-obj-$(CONFIG_WIN32) += commands-win32.o channel-win32.o service-win32.o
 qga-obj-$(CONFIG_WIN32) += vss-win32.o
 qga-obj-y += qapi-generated/qga-qapi-types.o qapi-generated/qga-qapi-visit.o
 qga-obj-y += qapi-generated/qga-qapi-commands.o
+qga-obj-y += qapi-generated/qga-qapi-init-commands.o
 
 qga-vss-dll-obj-$(CONFIG_QGA_VSS) += vss-win32/

qga/main.c

@@ -24,7 +24,7 @@
 #include "qapi/qmp/qjson.h"
 #include "qapi/qmp/qstring.h"
 #include "guest-agent-core.h"
-#include "qga-qapi-commands.h"
+#include "qga-qapi-init-commands.h"
 #include "qapi/qmp/qerror.h"
 #include "qapi/error.h"
 #include "channel.h"

scripts/qapi/commands.py

@@ -263,18 +263,25 @@ class QAPISchemaGenCommandVisitor(QAPISchemaModularCVisitor):
                              commands=commands, visit=visit))
         self._genh.add(mcgen('''
 #include "%(types)s.h"
-#include "qapi/qmp/dispatch.h"
 
 ''',
                              types=types))
 
     def visit_end(self):
-        (genc, genh) = self._module[self._main_module]
+        self._add_system_module('init', ' * QAPI Commands initialization')
-        genh.add(mcgen('''
+        self._genh.add(mcgen('''
+#include "qapi/qmp/dispatch.h"
+
 void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds);
 ''',
                        c_prefix=c_name(self._prefix, protect=False)))
-        genc.add(gen_registry(self._regy.get_content(), self._prefix))
+        self._genc.preamble_add(mcgen('''
+#include "qemu/osdep.h"
+#include "%(prefix)sqapi-commands.h"
+#include "%(prefix)sqapi-init-commands.h"
+''',
+                                      prefix=self._prefix))
+        self._genc.add(gen_registry(self._regy.get_content(), self._prefix))
 
     def visit_command(self, name, info, ifcond, arg_type, ret_type, gen,
                       success_response, boxed, allow_oob, allow_preconfig,

tests/.gitignore

@@ -12,6 +12,7 @@ test-*
 !test-*.c
 !docker/test-*
 test-qapi-commands.[ch]
+test-qapi-init-commands.[ch]
 include/test-qapi-commands-sub-module.[ch]
 test-qapi-commands-sub-sub-module.[ch]
 test-qapi-emit-events.[ch]

tests/Makefile.include

@@ -504,6 +504,7 @@ generated-files-y += tests/test-qapi-visit.h
 generated-files-y += tests/include/test-qapi-visit-sub-module.h
 generated-files-y += tests/test-qapi-visit-sub-sub-module.h
 generated-files-y += tests/test-qapi-commands.h
+generated-files-y += tests/test-qapi-init-commands.h
 generated-files-y += tests/include/test-qapi-commands-sub-module.h
 generated-files-y += tests/test-qapi-commands-sub-sub-module.h
 generated-files-y += tests/test-qapi-emit-events.h
@@ -617,6 +618,8 @@ tests/test-qapi-commands-sub-sub-module.h \
 tests/test-qapi-commands-sub-sub-module.c \
 tests/test-qapi-emit-events.c tests/test-qapi-emit-events.h \
 tests/test-qapi-events.c tests/test-qapi-events.h \
+tests/test-qapi-init-commands.c \
+tests/test-qapi-init-commands.h \
 tests/include/test-qapi-events-sub-module.c \
 tests/include/test-qapi-events-sub-module.h \
 tests/test-qapi-events-sub-sub-module.c \
@@ -660,7 +663,7 @@ tests/test-qmp-event$(EXESUF): tests/test-qmp-event.o $(test-qapi-obj-y) tests/t
 tests/test-qobject-output-visitor$(EXESUF): tests/test-qobject-output-visitor.o $(test-qapi-obj-y)
 tests/test-clone-visitor$(EXESUF): tests/test-clone-visitor.o $(test-qapi-obj-y)
 tests/test-qobject-input-visitor$(EXESUF): tests/test-qobject-input-visitor.o $(test-qapi-obj-y)
-tests/test-qmp-cmds$(EXESUF): tests/test-qmp-cmds.o tests/test-qapi-commands.o $(test-qapi-obj-y)
+tests/test-qmp-cmds$(EXESUF): tests/test-qmp-cmds.o tests/test-qapi-commands.o tests/test-qapi-init-commands.o $(test-qapi-obj-y)
 tests/test-visitor-serialization$(EXESUF): tests/test-visitor-serialization.o $(test-qapi-obj-y)
 tests/test-opts-visitor$(EXESUF): tests/test-opts-visitor.o $(test-qapi-obj-y)
 

tests/test-qmp-cmds.c

@@ -7,6 +7,7 @@
 #include "tests/test-qapi-types.h"
 #include "tests/test-qapi-visit.h"
 #include "test-qapi-commands.h"
+#include "test-qapi-init-commands.h"
 
 static QmpCommandList qmp_commands;