""" QAPI command marshaller generator Copyright IBM, Corp. 2011 Copyright (C) 2014-2018 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.common import * def gen_command_decl(name, arg_type, boxed, 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=build_params(arg_type, boxed, 'Error **errp')) def gen_call(name, arg_type, boxed, ret_type): ret = '' argstr = '' if boxed: assert arg_type and not arg_type.is_empty() argstr = '&arg, ' elif 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 += mcgen(''' if (err) { goto out; } 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; Visitor *v; v = qobject_output_visitor_new(ret_out); visit_type_%(c_name)s(v, "unused", &ret_in, &err); if (!err) { visit_complete(v, ret_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 build_marshal_proto(name): return ('void qmp_marshal_%s(QDict *args, QObject **ret, Error **errp)' % c_name(name)) def gen_marshal_decl(name): return mcgen(''' %(proto)s; ''', proto=build_marshal_proto(name)) def gen_marshal(name, arg_type, boxed, ret_type): have_args = arg_type and not arg_type.is_empty() ret = mcgen(''' %(proto)s { Error *err = NULL; ''', proto=build_marshal_proto(name)) if ret_type: ret += mcgen(''' %(c_type)s retval; ''', c_type=ret_type.c_type()) if have_args: visit_members = ('visit_type_%s_members(v, &arg, &err);' % arg_type.c_name()) ret += mcgen(''' Visitor *v; %(c_name)s arg = {0}; ''', c_name=arg_type.c_name()) else: visit_members = '' ret += mcgen(''' Visitor *v = NULL; if (args) { ''') push_indent() ret += mcgen(''' v = qobject_input_visitor_new(QOBJECT(args)); visit_start_struct(v, NULL, NULL, 0, &err); if (err) { goto out; } %(visit_members)s if (!err) { visit_check_struct(v, &err); } visit_end_struct(v, NULL); if (err) { goto out; } ''', visit_members=visit_members) if not have_args: pop_indent() ret += mcgen(''' } ''') ret += gen_call(name, arg_type, boxed, ret_type) ret += mcgen(''' out: error_propagate(errp, err); visit_free(v); ''') if have_args: visit_members = ('visit_type_%s_members(v, &arg, NULL);' % arg_type.c_name()) else: visit_members = '' ret += mcgen(''' if (args) { ''') push_indent() ret += mcgen(''' v = qapi_dealloc_visitor_new(); visit_start_struct(v, NULL, NULL, 0, NULL); %(visit_members)s visit_end_struct(v, NULL); visit_free(v); ''', visit_members=visit_members) if not have_args: pop_indent() ret += mcgen(''' } ''') 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(cmds, "%(name)s", qmp_marshal_%(c_name)s, %(opts)s); ''', name=name, c_name=c_name(name), opts=options) return ret def gen_registry(registry, prefix): ret = mcgen(''' void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds) { QTAILQ_INIT(cmds); ''', c_prefix=c_name(prefix, protect=False)) ret += registry ret += mcgen(''' } ''') return ret class QAPISchemaGenCommandVisitor(QAPISchemaVisitor): def __init__(self, prefix): self._prefix = prefix 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): self.defn += gen_registry(self._regy, self._prefix) self._regy = None self._visited_ret_types = None def visit_command(self, name, info, arg_type, ret_type, gen, success_response, boxed): if not gen: return self.decl += gen_command_decl(name, arg_type, boxed, 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) self.decl += gen_marshal_decl(name) self.defn += gen_marshal(name, arg_type, boxed, ret_type) self._regy += gen_register_command(name, success_response) def gen_commands(schema, output_dir, prefix): blurb = ' * Schema-defined QAPI/QMP commands' genc = QAPIGenC(blurb, __doc__) genh = QAPIGenH(blurb, __doc__) genc.add(mcgen(''' #include "qemu/osdep.h" #include "qemu-common.h" #include "qemu/module.h" #include "qapi/visitor.h" #include "qapi/qmp/qdict.h" #include "qapi/qobject-output-visitor.h" #include "qapi/qobject-input-visitor.h" #include "qapi/dealloc-visitor.h" #include "qapi/error.h" #include "%(prefix)sqapi-types.h" #include "%(prefix)sqapi-visit.h" #include "%(prefix)sqmp-commands.h" ''', prefix=prefix)) genh.add(mcgen(''' #include "%(prefix)sqapi-types.h" #include "qapi/qmp/dispatch.h" void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds); ''', prefix=prefix, c_prefix=c_name(prefix, protect=False))) vis = QAPISchemaGenCommandVisitor(prefix) schema.visit(vis) genc.add(vis.defn) genh.add(vis.decl) genc.write(output_dir, prefix + 'qmp-marshal.c') genh.write(output_dir, prefix + 'qmp-commands.h')