# # QAPI command marshaller generator # # Copyright IBM, Corp. 2011 # Copyright (C) 2014-2015 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_err_check(err): if not err: return '' return mcgen(''' if (%(err)s) { goto out; } ''', err=err) def gen_call(name, arg_type, ret_type): ret = '' argstr = '' if arg_type: for memb in arg_type.members: if memb.optional: argstr += 'has_%s, ' % c_name(memb.name) argstr += '%s, ' % c_name(memb.name) lhs = '' if ret_type: lhs = 'retval = ' push_indent() ret = mcgen(''' %(lhs)sqmp_%(c_name)s(%(args)s&local_err); ''', c_name=c_name(name), args=argstr, lhs=lhs) if ret_type: ret += gen_err_check('local_err') ret += mcgen(''' qmp_marshal_output_%(c_name)s(retval, ret, &local_err); ''', c_name=c_name(name)) pop_indent() return ret def gen_marshal_vars(arg_type, ret_type): ret = mcgen(''' Error *local_err = NULL; ''') push_indent() if ret_type: ret += mcgen(''' %(c_type)s retval; ''', c_type=ret_type.c_type()) if arg_type: ret += mcgen(''' QmpInputVisitor *mi = qmp_input_visitor_new_strict(QOBJECT(args)); QapiDeallocVisitor *md; Visitor *v; ''') for memb in arg_type.members: if memb.optional: ret += mcgen(''' bool has_%(c_name)s = false; ''', c_name=c_name(memb.name)) ret += mcgen(''' %(c_type)s %(c_name)s = %(c_null)s; ''', c_name=c_name(memb.name), c_type=memb.type.c_type(), c_null=memb.type.c_null()) ret += '\n' else: ret += mcgen(''' (void)args; ''') pop_indent() return ret def gen_marshal_input_visit(arg_type, dealloc=False): ret = '' if not arg_type: return ret push_indent() if dealloc: errparg = 'NULL' errarg = None ret += mcgen(''' qmp_input_visitor_cleanup(mi); md = qapi_dealloc_visitor_new(); v = qapi_dealloc_get_visitor(md); ''') else: errparg = '&local_err' errarg = 'local_err' ret += mcgen(''' v = qmp_input_get_visitor(mi); ''') for memb in arg_type.members: if memb.optional: ret += mcgen(''' visit_optional(v, &has_%(c_name)s, "%(name)s", %(errp)s); ''', c_name=c_name(memb.name), name=memb.name, errp=errparg) ret += gen_err_check(errarg) ret += mcgen(''' if (has_%(c_name)s) { ''', c_name=c_name(memb.name)) push_indent() ret += mcgen(''' visit_type_%(c_type)s(v, &%(c_name)s, "%(name)s", %(errp)s); ''', c_name=c_name(memb.name), name=memb.name, c_type=memb.type.c_name(), errp=errparg) ret += gen_err_check(errarg) if memb.optional: pop_indent() ret += mcgen(''' } ''') if dealloc: ret += mcgen(''' qapi_dealloc_visitor_cleanup(md); ''') pop_indent() return ret def gen_marshal_output(name, ret_type): return mcgen(''' static void qmp_marshal_output_%(c_cmd_name)s(%(c_type)s ret_in, QObject **ret_out, Error **errp) { Error *local_err = NULL; QmpOutputVisitor *mo = qmp_output_visitor_new(); QapiDeallocVisitor *md; Visitor *v; v = qmp_output_get_visitor(mo); visit_type_%(c_name)s(v, &ret_in, "unused", &local_err); if (local_err) { goto out; } *ret_out = qmp_output_get_qobject(mo); out: error_propagate(errp, local_err); qmp_output_visitor_cleanup(mo); md = qapi_dealloc_visitor_new(); v = qapi_dealloc_get_visitor(md); visit_type_%(c_name)s(v, &ret_in, "unused", NULL); qapi_dealloc_visitor_cleanup(md); } ''', c_type=ret_type.c_type(), c_cmd_name=c_name(name), 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 { ''', proto=gen_marshal_proto(name)) ret += gen_marshal_vars(arg_type, ret_type) ret += gen_marshal_input_visit(arg_type) ret += gen_call(name, arg_type, ret_type) if re.search('^ *goto out;', ret, re.MULTILINE): ret += mcgen(''' out: ''') ret += mcgen(''' error_propagate(errp, local_err); ''') ret += gen_marshal_input_visit(arg_type, dealloc=True) ret += mcgen(''' } ''') return ret def gen_register_command(name, success_response): push_indent() 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) pop_indent() 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 def visit_begin(self, schema): self.decl = '' self.defn = '' self._regy = '' def visit_end(self): if not middle_mode: self.defn += gen_registry(self._regy) self._regy = 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: self.defn += gen_marshal_output(name, 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-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)