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#
# QAPI event generator
#
# Copyright (c) 2014 Wenchao Xia
# Copyright (c) 2015 Red Hat Inc.
#
# Authors:
# Wenchao Xia <wenchaoqemu@gmail.com>
# Markus Armbruster <armbru@redhat.com>
#
# 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 *
def _generate_event_api_name(event_name, params):
api_name = "void qapi_event_send_%s(" % c_name(event_name).lower();
l = len(api_name)
if params:
for m in params.members:
if m.optional:
api_name += "bool has_%s,\n" % c_name(m.name)
api_name += "".ljust(l)
api_name += "%s %s,\n" % (m.type.c_type(is_param=True),
c_name(m.name))
api_name += "".ljust(l)
api_name += "Error **errp)"
return api_name;
# Following are the core functions that generate C APIs to emit event.
def generate_event_declaration(api_name):
return mcgen('''
%(api_name)s;
''',
api_name = api_name)
def generate_event_implement(api_name, event_name, params):
# step 1: declare any variables
ret = mcgen("""
%(api_name)s
{
QDict *qmp;
Error *local_err = NULL;
QMPEventFuncEmit emit;
""",
api_name = api_name)
if params and params.members:
ret += mcgen("""
QmpOutputVisitor *qov;
Visitor *v;
QObject *obj;
""")
# step 2: check emit function, create a dict
ret += mcgen("""
emit = qmp_event_get_func_emit();
if (!emit) {
return;
}
qmp = qmp_event_build_dict("%(event_name)s");
""",
event_name = event_name)
# step 3: visit the params if params != None
if params and params.members:
ret += mcgen("""
qov = qmp_output_visitor_new();
g_assert(qov);
v = qmp_output_get_visitor(qov);
g_assert(v);
/* Fake visit, as if all members are under a structure */
visit_start_struct(v, NULL, "", "%(event_name)s", 0, &local_err);
if (local_err) {
goto clean;
}
""",
event_name = event_name)
for memb in params.members:
if memb.optional:
ret += mcgen("""
if (has_%(var)s) {
""",
var=c_name(memb.name))
push_indent()
if memb.type.name == "str":
var_type = "(char **)"
else:
var_type = ""
ret += mcgen("""
visit_type_%(type)s(v, %(var_type)s&%(var)s, "%(name)s", &local_err);
if (local_err) {
goto clean;
}
""",
var_type = var_type,
var=c_name(memb.name),
type=memb.type.c_name(),
name=memb.name)
if memb.optional:
pop_indent()
ret += mcgen("""
}
""")
ret += mcgen("""
visit_end_struct(v, &local_err);
if (local_err) {
goto clean;
}
obj = qmp_output_get_qobject(qov);
g_assert(obj != NULL);
qdict_put_obj(qmp, "data", obj);
""")
# step 4: call qmp event api
ret += mcgen("""
emit(%(event_enum_value)s, qmp, &local_err);
""",
event_enum_value = c_enum_const(event_enum_name, event_name))
# step 5: clean up
if params and params.members:
ret += mcgen("""
clean:
qmp_output_visitor_cleanup(qov);
""")
ret += mcgen("""
error_propagate(errp, local_err);
QDECREF(qmp);
}
""")
return ret
class QAPISchemaGenEventVisitor(QAPISchemaVisitor):
def __init__(self):
self.decl = None
self.defn = None
self._event_names = None
def visit_begin(self, schema):
self.decl = ''
self.defn = ''
self._event_names = []
def visit_end(self):
self.decl += generate_enum(event_enum_name, self._event_names)
self.defn += generate_enum_lookup(event_enum_name, self._event_names)
self._event_names = None
def visit_event(self, name, info, arg_type):
api_name = _generate_event_api_name(name, arg_type)
self.decl += generate_event_declaration(api_name)
self.defn += generate_event_implement(api_name, name, arg_type)
self._event_names.append(name)
(input_file, output_dir, do_c, do_h, prefix, dummy) = parse_command_line()
c_comment = '''
/*
* schema-defined QAPI event functions
*
* Copyright (c) 2014 Wenchao Xia
*
* Authors:
* Wenchao Xia <wenchaoqemu@gmail.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
'''
h_comment = '''
/*
* schema-defined QAPI event functions
*
* Copyright (c) 2014 Wenchao Xia
*
* Authors:
* Wenchao Xia <wenchaoqemu@gmail.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
'''
(fdef, fdecl) = open_output(output_dir, do_c, do_h, prefix,
'qapi-event.c', 'qapi-event.h',
c_comment, h_comment)
fdef.write(mcgen('''
#include "qemu-common.h"
#include "%(prefix)sqapi-event.h"
#include "%(prefix)sqapi-visit.h"
#include "qapi/qmp-output-visitor.h"
#include "qapi/qmp-event.h"
''',
prefix=prefix))
fdecl.write(mcgen('''
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "%(prefix)sqapi-types.h"
''',
prefix=prefix))
event_enum_name = c_name(prefix + "QAPIEvent", protect=False)
schema = QAPISchema(input_file)
gen = QAPISchemaGenEventVisitor()
schema.visit(gen)
fdef.write(gen.defn)
fdecl.write(gen.decl)
close_output(fdef, fdecl)
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