qapi-gen: New common driver for code and doc generators

Whenever qapi-schema.json changes, we run six programs eleven times to
update eleven files.  Similar for qga/qapi-schema.json.  This is
silly.  Replace the six programs by a single program that spits out
all eleven files.

The programs become modules in new Python package qapi, along with the
helper library.  This requires moving them to scripts/qapi/.  While
moving them, consistently drop executable mode bits.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180211093607.27351-9-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
[eblake: move change to one-line 'blurb' earlier in series, mention mode
bit change as intentional, update qapi-code-gen.txt to match actual
generated events.c file]
Signed-off-by: Eric Blake <eblake@redhat.com>

9 files changed, 73 insertions, 141 deletions

diff --git a/scripts/qapi-gen.py b/scripts/qapi-gen.py
new file mode 100755
index 0000000..2100ca1
--- /dev/null
+++ b/scripts/qapi-gen.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+# QAPI generator
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+
+import sys
+from qapi.common import parse_command_line, QAPISchema
+from qapi.types import gen_types
+from qapi.visit import gen_visit
+from qapi.commands import gen_commands
+from qapi.events import gen_events
+from qapi.introspect import gen_introspect
+from qapi.doc import gen_doc
+
+
+def main(argv):
+    (input_file, output_dir, prefix, opts) = \
+        parse_command_line('bu', ['builtins', 'unmask-non-abi-names'])
+
+    opt_builtins = False
+    opt_unmask = False
+
+    for o, a in opts:
+        if o in ('-b', '--builtins'):
+            opt_builtins = True
+        if o in ('-u', '--unmask-non-abi-names'):
+            opt_unmask = True
+
+    schema = QAPISchema(input_file)
+
+    gen_types(schema, output_dir, prefix, opt_builtins)
+    gen_visit(schema, output_dir, prefix, opt_builtins)
+    gen_commands(schema, output_dir, prefix)
+    gen_events(schema, output_dir, prefix)
+    gen_introspect(schema, output_dir, prefix, opt_unmask)
+    gen_doc(schema, output_dir, prefix)
+
+
+if __name__ == '__main__':
+    main(sys.argv)
diff --git a/scripts/qapi/__init__.py b/scripts/qapi/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/scripts/qapi/__init__.py
diff --git a/scripts/qapi-commands.py b/scripts/qapi/commands.py
index c20b220..a744611 100644
--- a/scripts/qapi-commands.py
+++ b/scripts/qapi/commands.py
@@ -13,7 +13,7 @@ This work is licensed under the terms of the GNU GPL, version 2.
 See the COPYING file in the top-level directory.
 """
 
-from qapi import *
+from qapi.common import *
 
 
 def gen_command_decl(name, arg_type, boxed, ret_type):
@@ -255,11 +255,8 @@ class QAPISchemaGenCommandVisitor(QAPISchemaVisitor):
         self._regy += gen_register_command(name, success_response)
 
 
-def main(argv):
-    (input_file, output_dir, do_c, do_h, prefix, opts) = parse_command_line()
-
+def gen_commands(schema, output_dir, prefix):
     blurb = ' * Schema-defined QAPI/QMP commands'
-
     genc = QAPIGenC(blurb, __doc__)
     genh = QAPIGenH(blurb, __doc__)
 
@@ -288,17 +285,9 @@ void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds);
 ''',
                    prefix=prefix, c_prefix=c_name(prefix, protect=False)))
 
-    schema = QAPISchema(input_file)
     vis = QAPISchemaGenCommandVisitor(prefix)
     schema.visit(vis)
     genc.add(vis.defn)
     genh.add(vis.decl)
-
-    if do_c:
-        genc.write(output_dir, prefix + 'qmp-marshal.c')
-    if do_h:
-        genh.write(output_dir, prefix + 'qmp-commands.h')
-
-
-if __name__ == '__main__':
-    main(sys.argv)
+    genc.write(output_dir, prefix + 'qmp-marshal.c')
+    genh.write(output_dir, prefix + 'qmp-commands.h')
diff --git a/scripts/qapi.py b/scripts/qapi/common.py
index f12cddd..3bc31a0 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi/common.py
@@ -1932,17 +1932,15 @@ def parse_command_line(extra_options='', extra_long_options=[]):
 
     try:
         opts, args = getopt.gnu_getopt(sys.argv[1:],
-                                       'chp:o:' + extra_options,
-                                       ['source', 'header', 'prefix=',
-                                        'output-dir='] + extra_long_options)
+                                       'p:o:' + extra_options,
+                                       ['prefix=', 'output-dir=']
+                                       + extra_long_options)
     except getopt.GetoptError as err:
         print("%s: %s" % (sys.argv[0], str(err)), file=sys.stderr)
         sys.exit(1)
 
     output_dir = ''
     prefix = ''
-    do_c = False
-    do_h = False
     extra_opts = []
 
     for oa in opts:
@@ -1956,23 +1954,15 @@ def parse_command_line(extra_options='', extra_long_options=[]):
             prefix = a
         elif o in ('-o', '--output-dir'):
             output_dir = a + '/'
-        elif o in ('-c', '--source'):
-            do_c = True
-        elif o in ('-h', '--header'):
-            do_h = True
         else:
             extra_opts.append(oa)
 
-    if not do_c and not do_h:
-        do_c = True
-        do_h = True
-
     if len(args) != 1:
         print("%s: need exactly one argument" % sys.argv[0], file=sys.stderr)
         sys.exit(1)
     fname = args[0]
 
-    return (fname, output_dir, do_c, do_h, prefix, extra_opts)
+    return (fname, output_dir, prefix, extra_opts)
 
 
 #
diff --git a/scripts/qapi2texi.py b/scripts/qapi/doc.py
index 8a604d8..cc4d5a4 100755..100644
--- a/scripts/qapi2texi.py
+++ b/scripts/qapi/doc.py
@@ -4,11 +4,10 @@
 # This work is licensed under the terms of the GNU LGPL, version 2+.
 # See the COPYING file in the top-level directory.
 """This script produces the documentation of a qapi schema in texinfo format"""
+
 from __future__ import print_function
 import re
-import sys
-
-import qapi
+import qapi.common
 
 MSG_FMT = """
 @deftypefn {type} {{}} {name}
@@ -197,7 +196,7 @@ def texi_entity(doc, what, base=None, variants=None,
             + texi_sections(doc))
 
 
-class QAPISchemaGenDocVisitor(qapi.QAPISchemaVisitor):
+class QAPISchemaGenDocVisitor(qapi.common.QAPISchemaVisitor):
     def __init__(self):
         self.out = None
         self.cur_doc = None
@@ -272,20 +271,8 @@ def texi_schema(schema):
     return gen.out
 
 
-def main(argv):
-    """Takes schema argument, prints result to stdout"""
-    if len(argv) != 2:
-        print("%s: need exactly 1 argument: SCHEMA" % argv[0], file=sys.stderr)
-        sys.exit(1)
-
-    schema = qapi.QAPISchema(argv[1])
-    if not qapi.doc_required:
-        print("%s: need pragma 'doc-required' "
-               "to generate documentation" % argv[0], file=sys.stderr)
-        sys.exit(1)
-    print('@c AUTOMATICALLY GENERATED, DO NOT MODIFY\n')
-    print(texi_schema(schema), end='')
-
-
-if __name__ == '__main__':
-    main(sys.argv)
+def gen_doc(schema, output_dir, prefix):
+    if qapi.common.doc_required:
+        gen = qapi.common.QAPIGenDoc()
+        gen.add(texi_schema(schema))
+        gen.write(output_dir, prefix + 'qapi-doc.texi')
diff --git a/scripts/qapi-event.py b/scripts/qapi/events.py
index 1f8bf62..b7dc820 100644
--- a/scripts/qapi-event.py
+++ b/scripts/qapi/events.py
@@ -12,7 +12,7 @@ This work is licensed under the terms of the GNU GPL, version 2.
 See the COPYING file in the top-level directory.
 """
 
-from qapi import *
+from qapi.common import *
 
 
 def build_event_send_proto(name, arg_type, boxed):
@@ -171,11 +171,8 @@ class QAPISchemaGenEventVisitor(QAPISchemaVisitor):
         self._event_names.append(name)
 
 
-def main(argv):
-    (input_file, output_dir, do_c, do_h, prefix, dummy) = parse_command_line()
-
+def gen_events(schema, output_dir, prefix):
     blurb = ' * Schema-defined QAPI/QMP events'
-
     genc = QAPIGenC(blurb, __doc__)
     genh = QAPIGenH(blurb, __doc__)
 
@@ -199,17 +196,9 @@ def main(argv):
 ''',
                    prefix=prefix))
 
-    schema = QAPISchema(input_file)
     vis = QAPISchemaGenEventVisitor(prefix)
     schema.visit(vis)
     genc.add(vis.defn)
     genh.add(vis.decl)
-
-    if do_c:
-        genc.write(output_dir, prefix + 'qapi-event.c')
-    if do_h:
-        genh.write(output_dir, prefix + 'qapi-event.h')
-
-
-if __name__ == '__main__':
-    main(sys.argv)
+    genc.write(output_dir, prefix + 'qapi-event.c')
+    genh.write(output_dir, prefix + 'qapi-event.h')
diff --git a/scripts/qapi-introspect.py b/scripts/qapi/introspect.py
index cac219b..1e4f065 100644
--- a/scripts/qapi-introspect.py
+++ b/scripts/qapi/introspect.py
@@ -10,7 +10,7 @@ This work is licensed under the terms of the GNU GPL, version 2.
 See the COPYING file in the top-level directory.
 """
 
-from qapi import *
+from qapi.common import *
 
 
 # Caveman's json.dumps() replacement (we're stuck at Python 2.4)
@@ -168,20 +168,8 @@ const char %(c_name)s[] = %(c_string)s;
         self._gen_json(name, 'event', {'arg-type': self._use_type(arg_type)})
 
 
-def main(argv):
-    # Debugging aid: unmask QAPI schema's type names
-    # We normally mask them, because they're not QMP wire ABI
-    opt_unmask = False
-
-    (input_file, output_dir, do_c, do_h, prefix, opts) = \
-        parse_command_line('u', ['unmask-non-abi-names'])
-
-    for o, a in opts:
-        if o in ('-u', '--unmask-non-abi-names'):
-            opt_unmask = True
-
+def gen_introspect(schema, output_dir, prefix, opt_unmask):
     blurb = ' * QAPI/QMP schema introspection'
-
     genc = QAPIGenC(blurb, __doc__)
     genh = QAPIGenH(blurb, __doc__)
 
@@ -192,17 +180,9 @@ def main(argv):
 ''',
                    prefix=prefix))
 
-    schema = QAPISchema(input_file)
     vis = QAPISchemaGenIntrospectVisitor(prefix, opt_unmask)
     schema.visit(vis)
     genc.add(vis.defn)
     genh.add(vis.decl)
-
-    if do_c:
-        genc.write(output_dir, prefix + 'qmp-introspect.c')
-    if do_h:
-        genh.write(output_dir, prefix + 'qmp-introspect.h')
-
-
-if __name__ == '__main__':
-    main(sys.argv)
+    genc.write(output_dir, prefix + 'qmp-introspect.c')
+    genh.write(output_dir, prefix + 'qmp-introspect.h')
diff --git a/scripts/qapi-types.py b/scripts/qapi/types.py
index 7d23544..aa3c01e 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi/types.py
@@ -13,7 +13,7 @@ This work is licensed under the terms of the GNU GPL, version 2.
 # See the COPYING file in the top-level directory.
 """
 
-from qapi import *
+from qapi.common import *
 
 
 # variants must be emitted before their container; track what has already
@@ -241,22 +241,8 @@ class QAPISchemaGenTypeVisitor(QAPISchemaVisitor):
         self._gen_type_cleanup(name)
 
 
-def main(argv):
-    # If you link code generated from multiple schemata, you want only one
-    # instance of the code for built-in types.  Generate it only when
-    # opt_builtins, enabled by command line option -b.  See also
-    # QAPISchemaGenTypeVisitor.visit_end().
-    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'):
-            opt_builtins = True
-
+def gen_types(schema, output_dir, prefix, opt_builtins):
     blurb = ' * Schema-defined QAPI types'
-
     genc = QAPIGenC(blurb, __doc__)
     genh = QAPIGenH(blurb, __doc__)
 
@@ -272,17 +258,9 @@ def main(argv):
 #include "qapi/util.h"
 '''))
 
-    schema = QAPISchema(input_file)
     vis = QAPISchemaGenTypeVisitor(opt_builtins)
     schema.visit(vis)
     genc.add(vis.defn)
     genh.add(vis.decl)
-
-    if do_c:
-        genc.write(output_dir, prefix + 'qapi-types.c')
-    if do_h:
-        genh.write(output_dir, prefix + 'qapi-types.h')
-
-
-if __name__ == '__main__':
-    main(sys.argv)
+    genc.write(output_dir, prefix + 'qapi-types.c')
+    genh.write(output_dir, prefix + 'qapi-types.h')
diff --git a/scripts/qapi-visit.py b/scripts/qapi/visit.py
index 3c23a93..3ed7816 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi/visit.py
@@ -13,7 +13,7 @@ This work is licensed under the terms of the GNU GPL, version 2.
 See the COPYING file in the top-level directory.
 """
 
-from qapi import *
+from qapi.common import *
 
 
 def gen_visit_decl(name, scalar=False):
@@ -324,22 +324,8 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor):
         self.defn += gen_visit_alternate(name, variants)
 
 
-def main(argv):
-    # If you link code generated from multiple schemata, you want only one
-    # instance of the code for built-in types.  Generate it only when
-    # opt_builtins, enabled by command line option -b.  See also
-    # QAPISchemaGenVisitVisitor.visit_end().
-    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'):
-            opt_builtins = True
-
+def gen_visit(schema, output_dir, prefix, opt_builtins):
     blurb = ' * Schema-defined QAPI visitors'
-
     genc = QAPIGenC(blurb, __doc__)
     genh = QAPIGenH(blurb, __doc__)
 
@@ -359,17 +345,9 @@ def main(argv):
 ''',
                    prefix=prefix))
 
-    schema = QAPISchema(input_file)
     vis = QAPISchemaGenVisitVisitor(opt_builtins)
     schema.visit(vis)
     genc.add(vis.defn)
     genh.add(vis.decl)
-
-    if do_c:
-        genc.write(output_dir, prefix + 'qapi-visit.c')
-    if do_h:
-        genh.write(output_dir, prefix + 'qapi-visit.h')
-
-
-if __name__ == '__main__':
-    main(sys.argv)
+    genc.write(output_dir, prefix + 'qapi-visit.c')
+    genh.write(output_dir, prefix + 'qapi-visit.h')