scripts/qapi-event.py

   1 #
   2 # QAPI event generator
   3 #
   4 # Copyright (c) 2014 Wenchao Xia
   5 # Copyright (c) 2015-2016 Red Hat Inc.
   6 #
   7 # Authors:
   8 #  Wenchao Xia <wenchaoqemu@gmail.com>
   9 #  Markus Armbruster <armbru@redhat.com>
  10 #
  11 # This work is licensed under the terms of the GNU GPL, version 2.
  12 # See the COPYING file in the top-level directory.
  13
  14 from qapi import *
  15
  16
  17 def gen_event_send_proto(name, arg_type):
  18     return 'void qapi_event_send_%(c_name)s(%(param)s)' % {
  19         'c_name': c_name(name.lower()),
  20         'param': gen_params(arg_type, 'Error **errp')}
  21
  22
  23 def gen_event_send_decl(name, arg_type):
  24     return mcgen('''
  25
  26 %(proto)s;
  27 ''',
  28                  proto=gen_event_send_proto(name, arg_type))
  29
  30
  31 def gen_event_send(name, arg_type):
  32     ret = mcgen('''
  33
  34 %(proto)s
  35 {
  36     QDict *qmp;
  37     Error *err = NULL;
  38     QMPEventFuncEmit emit;
  39 ''',
  40                 proto=gen_event_send_proto(name, arg_type))
  41
  42     if arg_type and arg_type.members:
  43         ret += mcgen('''
  44     QmpOutputVisitor *qov;
  45     Visitor *v;
  46     QObject *obj;
  47
  48 ''')
  49
  50     ret += mcgen('''
  51     emit = qmp_event_get_func_emit();
  52     if (!emit) {
  53         return;
  54     }
  55
  56     qmp = qmp_event_build_dict("%(name)s");
  57
  58 ''',
  59                  name=name)
  60
  61     if arg_type and arg_type.members:
  62         ret += mcgen('''
  63     qov = qmp_output_visitor_new();
  64     v = qmp_output_get_visitor(qov);
  65
  66     visit_start_struct(v, "%(name)s", NULL, 0, &err);
  67 ''',
  68                      name=name)
  69         ret += gen_err_check()
  70         ret += gen_visit_fields(arg_type.members, need_cast=True,
  71                                 label='out_obj')
  72         ret += mcgen('''
  73 out_obj:
  74     visit_end_struct(v, err ? NULL : &err);
  75     if (err) {
  76         goto out;
  77     }
  78
  79     obj = qmp_output_get_qobject(qov);
  80     g_assert(obj);
  81
  82     qdict_put_obj(qmp, "data", obj);
  83 ''')
  84
  85     ret += mcgen('''
  86     emit(%(c_enum)s, qmp, &err);
  87
  88 ''',
  89                  c_enum=c_enum_const(event_enum_name, name))
  90
  91     if arg_type and arg_type.members:
  92         ret += mcgen('''
  93 out:
  94     qmp_output_visitor_cleanup(qov);
  95 ''')
  96     ret += mcgen('''
  97     error_propagate(errp, err);
  98     QDECREF(qmp);
  99 }
 100 ''')
 101     return ret
 102
 103
 104 class QAPISchemaGenEventVisitor(QAPISchemaVisitor):
 105     def __init__(self):
 106         self.decl = None
 107         self.defn = None
 108         self._event_names = None
 109
 110     def visit_begin(self, schema):
 111         self.decl = ''
 112         self.defn = ''
 113         self._event_names = []
 114
 115     def visit_end(self):
 116         self.decl += gen_enum(event_enum_name, self._event_names)
 117         self.defn += gen_enum_lookup(event_enum_name, self._event_names)
 118         self._event_names = None
 119
 120     def visit_event(self, name, info, arg_type):
 121         self.decl += gen_event_send_decl(name, arg_type)
 122         self.defn += gen_event_send(name, arg_type)
 123         self._event_names.append(name)
 124
 125
 126 (input_file, output_dir, do_c, do_h, prefix, dummy) = parse_command_line()
 127
 128 c_comment = '''
 129 /*
 130  * schema-defined QAPI event functions
 131  *
 132  * Copyright (c) 2014 Wenchao Xia
 133  *
 134  * Authors:
 135  *  Wenchao Xia   <wenchaoqemu@gmail.com>
 136  *
 137  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 138  * See the COPYING.LIB file in the top-level directory.
 139  *
 140  */
 141 '''
 142 h_comment = '''
 143 /*
 144  * schema-defined QAPI event functions
 145  *
 146  * Copyright (c) 2014 Wenchao Xia
 147  *
 148  * Authors:
 149  *  Wenchao Xia  <wenchaoqemu@gmail.com>
 150  *
 151  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 152  * See the COPYING.LIB file in the top-level directory.
 153  *
 154  */
 155 '''
 156
 157 (fdef, fdecl) = open_output(output_dir, do_c, do_h, prefix,
 158                             'qapi-event.c', 'qapi-event.h',
 159                             c_comment, h_comment)
 160
 161 fdef.write(mcgen('''
 162 #include "qemu/osdep.h"
 163 #include "qemu-common.h"
 164 #include "%(prefix)sqapi-event.h"
 165 #include "%(prefix)sqapi-visit.h"
 166 #include "qapi/qmp-output-visitor.h"
 167 #include "qapi/qmp-event.h"
 168
 169 ''',
 170                  prefix=prefix))
 171
 172 fdecl.write(mcgen('''
 173 #include "qapi/error.h"
 174 #include "qapi/qmp/qdict.h"
 175 #include "%(prefix)sqapi-types.h"
 176
 177 ''',
 178                   prefix=prefix))
 179
 180 event_enum_name = c_name(prefix + "QAPIEvent", protect=False)
 181
 182 schema = QAPISchema(input_file)
 183 gen = QAPISchemaGenEventVisitor()
 184 schema.visit(gen)
 185 fdef.write(gen.defn)
 186 fdecl.write(gen.decl)
 187
 188 close_output(fdef, fdecl)