# # QAPI command marshaller generator # # Copyright IBM, Corp. 2011 # Copyright (C) 2014-2016 Red Hat, Inc. # # Authors: # Anthony Liguori # Michael Roth # Markus Armbruster # # 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 * import re def gen_command_decl(name, arg_type, ret_type): return mcgen(''' %(c_type)s qmp_%(c_name)s(%(params)s); ''', c_type=(ret_type and ret_type.c_type()) or 'void', c_name=c_name(name), params=gen_params(arg_type, 'Error **errp')) def gen_call(name, arg_type, ret_type): ret = '' argstr = '' if arg_type: assert not arg_type.variants for memb in arg_type.members: if memb.optional: argstr += 'arg.has_%s, ' % c_name(memb.name) argstr += 'arg.%s, ' % c_name(memb.name) lhs = '' if ret_type: lhs = 'retval = ' ret = mcgen(''' %(lhs)sqmp_%(c_name)s(%(args)s&err); ''', c_name=c_name(name), args=argstr, lhs=lhs) if ret_type: ret += gen_err_check() ret += mcgen(''' qmp_marshal_output_%(c_name)s(retval, ret, &err); ''', c_name=ret_type.c_name()) return ret def gen_marshal_output(ret_type): return mcgen(''' static void qmp_marshal_output_%(c_name)s(%(c_type)s ret_in, QObject **ret_out, Error **errp) { Error *err = NULL; QmpOutputVisitor *qov = qmp_output_visitor_new(); Visitor *v; v = qmp_output_get_visitor(qov); visit_type_%(c_name)s(v, "unused", &ret_in, &err); if (err) { goto out; } *ret_out = qmp_output_get_qobject(qov); out: error_propagate(errp, err); visit_free(v); v = qapi_dealloc_visitor_new(); visit_type_%(c_name)s(v, "unused", &ret_in, NULL); visit_free(v); } ''', c_type=ret_type.c_type(), c_name=ret_type.c_name()) def gen_marshal_proto(name): ret = 'void qmp_marshal_%s(QDict *args, QObject **ret, Error **errp)' % c_name(name) if not middle_mode: ret = 'static ' + ret return ret def gen_marshal_decl(name): return mcgen(''' %(proto)s; ''', proto=gen_marshal_proto(name)) def gen_marshal(name, arg_type, ret_type): ret = mcgen(''' %(proto)s { Error *err = NULL; ''', proto=gen_marshal_proto(name)) if ret_type: ret += mcgen(''' %(c_type)s retval; ''', c_type=ret_type.c_type()) if arg_type and arg_type.members: ret += mcgen(''' Visitor *v; %(c_name)s arg = {0}; v = qmp_input_visitor_new(QOBJECT(args), true); visit_start_struct(v, NULL, NULL, 0, &err); if (err) { goto out; } visit_type_%(c_name)s_members(v, &arg, &err); if (!err) { visit_check_struct(v, &err); } visit_end_struct(v, NULL); if (err) { goto out; } ''', c_name=arg_type.c_name()) else: ret += mcgen(''' (void)args; ''') ret += gen_call(name, arg_type, ret_type) # 'goto out' produced above for arg_type, and by gen_call() for ret_type if (arg_type and arg_type.members) or ret_type: ret += mcgen(''' out: ''') ret += mcgen(''' error_propagate(errp, err); ''') if arg_type and arg_type.members: ret += mcgen(''' visit_free(v); v = qapi_dealloc_visitor_new(); visit_start_struct(v, NULL, NULL, 0, NULL); visit_type_%(c_name)s_members(v, &arg, NULL); visit_end_struct(v, NULL); visit_free(v); ''', c_name=arg_type.c_name()) ret += mcgen(''' } ''') return ret def gen_register_command(name, success_response): options = 'QCO_NO_OPTIONS' if not success_response: options = 'QCO_NO_SUCCESS_RESP' ret = mcgen(''' qmp_register_command("%(name)s", qmp_marshal_%(c_name)s, %(opts)s); ''', name=name, c_name=c_name(name), opts=options) return ret def gen_registry(registry): ret = mcgen(''' static void qmp_init_marshal(void) { ''') ret += registry ret += mcgen(''' } qapi_init(qmp_init_marshal); ''') return ret class QAPISchemaGenCommandVisitor(QAPISchemaVisitor): def __init__(self): self.decl = None self.defn = None self._regy = None self._visited_ret_types = None def visit_begin(self, schema): self.decl = '' self.defn = '' self._regy = '' self._visited_ret_types = set() def visit_end(self): if not middle_mode: self.defn += gen_registry(self._regy) self._regy = None self._visited_ret_types = None def visit_command(self, name, info, arg_type, ret_type, gen, success_response): if not gen: return self.decl += gen_command_decl(name, arg_type, ret_type) if ret_type and ret_type not in self._visited_ret_types: self._visited_ret_types.add(ret_type) self.defn += gen_marshal_output(ret_type) if middle_mode: self.decl += gen_marshal_decl(name) self.defn += gen_marshal(name, arg_type, ret_type) if not middle_mode: self._regy += gen_register_command(name, success_response) middle_mode = False (input_file, output_dir, do_c, do_h, prefix, opts) = \ parse_command_line("m", ["middle"]) for o, a in opts: if o in ("-m", "--middle"): middle_mode = True c_comment = ''' /* * schema-defined QMP->QAPI command dispatch * * Copyright IBM, Corp. 2011 * * Authors: * Anthony Liguori * * 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 function prototypes * * Copyright IBM, Corp. 2011 * * Authors: * Anthony Liguori * * 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, 'qmp-marshal.c', 'qmp-commands.h', c_comment, h_comment) fdef.write(mcgen(''' #include "qemu/osdep.h" #include "qemu-common.h" #include "qemu/module.h" #include "qapi/qmp/types.h" #include "qapi/qmp/dispatch.h" #include "qapi/visitor.h" #include "qapi/qmp-output-visitor.h" #include "qapi/qmp-input-visitor.h" #include "qapi/dealloc-visitor.h" #include "%(prefix)sqapi-types.h" #include "%(prefix)sqapi-visit.h" #include "%(prefix)sqmp-commands.h" ''', prefix=prefix)) fdecl.write(mcgen(''' #include "%(prefix)sqapi-types.h" #include "qapi/qmp/qdict.h" #include "qapi/error.h" ''', prefix=prefix)) schema = QAPISchema(input_file) gen = QAPISchemaGenCommandVisitor() schema.visit(gen) fdef.write(gen.defn) fdecl.write(gen.decl) close_output(fdef, fdecl)