| # Copyright 2013, Big Switch Networks, Inc. |
| # |
| # LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with |
| # the following special exception: |
| # |
| # LOXI Exception |
| # |
| # As a special exception to the terms of the EPL, you may distribute libraries |
| # generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided |
| # that copyright and licensing notices generated by LoxiGen are not altered or removed |
| # from the LoxiGen Libraries and the notice provided below is (i) included in |
| # the LoxiGen Libraries, if distributed in source code form and (ii) included in any |
| # documentation for the LoxiGen Libraries, if distributed in binary form. |
| # |
| # Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler." |
| # |
| # You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain |
| # a copy of the EPL at: |
| # |
| # http://www.eclipse.org/legal/epl-v10.html |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| # EPL for the specific language governing permissions and limitations |
| # under the EPL. |
| |
| from collections import namedtuple |
| import struct |
| import of_g |
| import loxi_front_end.type_maps as type_maps |
| import loxi_utils.loxi_utils as utils |
| import util |
| import oftype |
| |
| OFClass = namedtuple('OFClass', ['name', 'pyname', 'members', 'type_members', |
| 'min_length', 'is_fixed_length']) |
| Member = namedtuple('Member', ['name', 'oftype', 'offset', 'skip']) |
| LengthMember = namedtuple('LengthMember', ['name', 'oftype', 'offset']) |
| TypeMember = namedtuple('TypeMember', ['name', 'oftype', 'offset', 'value']) |
| PadMember = namedtuple('PadMember', ['offset', 'length']) |
| |
| def get_type_values(cls, version): |
| """ |
| Returns a map from the name of the type member to its value. |
| """ |
| type_values = {} |
| |
| # Primary wire type |
| if utils.class_is_message(cls): |
| type_values['version'] = 'const.OFP_VERSION' |
| type_values['type'] = util.constant_for_value(version, "ofp_type", util.primary_wire_type(cls, version)) |
| if cls in type_maps.flow_mod_list: |
| type_values['_command'] = util.constant_for_value(version, "ofp_flow_mod_command", |
| type_maps.flow_mod_types[version][cls[8:]]) |
| if cls in type_maps.stats_request_list: |
| type_values['stats_type'] = util.constant_for_value(version, "ofp_stats_types", |
| type_maps.stats_types[version][cls[3:-14]]) |
| if cls in type_maps.stats_reply_list: |
| type_values['stats_type'] = util.constant_for_value(version, "ofp_stats_types", |
| type_maps.stats_types[version][cls[3:-12]]) |
| if type_maps.message_is_extension(cls, version): |
| type_values['experimenter'] = '%#x' % type_maps.extension_to_experimenter_id(cls) |
| type_values['subtype'] = type_maps.extension_message_to_subtype(cls, version) |
| elif utils.class_is_action(cls): |
| type_values['type'] = util.constant_for_value(version, "ofp_action_type", util.primary_wire_type(cls, version)) |
| if type_maps.action_is_extension(cls, version): |
| type_values['experimenter'] = '%#x' % type_maps.extension_to_experimenter_id(cls) |
| type_values['subtype'] = type_maps.extension_action_to_subtype(cls, version) |
| elif utils.class_is_queue_prop(cls): |
| type_values['type'] = util.constant_for_value(version, "ofp_queue_properties", util.primary_wire_type(cls, version)) |
| elif utils.class_is_hello_elem(cls): |
| type_values['type'] = util.constant_for_value(version, "ofp_hello_elem_type", util.primary_wire_type(cls, version)) |
| elif utils.class_is_oxm(cls): |
| oxm_class = 0x8000 |
| oxm_type = util.primary_wire_type(cls, version) |
| oxm_masked = cls.find('masked') != -1 and 1 or 0 |
| oxm_len = of_g.base_length[(cls, version)] |
| type_values['type_len'] = '%#x' % (oxm_class << 16 | oxm_type << 8 | \ |
| oxm_masked << 8 | oxm_len) |
| |
| return type_values |
| |
| # Create intermediate representation |
| def build_ofclasses(version): |
| blacklist = ["of_action", "of_action_header", "of_header", "of_queue_prop", |
| "of_queue_prop_header", "of_experimenter", "of_action_experimenter", |
| "of_oxm", "of_oxm_header", "of_oxm_experimenter_header", |
| "of_hello_elem", "of_hello_elem_header"] |
| ofclasses = [] |
| for cls in of_g.standard_class_order: |
| if version not in of_g.unified[cls] or cls in blacklist: |
| continue |
| unified_class = util.lookup_unified_class(cls, version) |
| |
| # Name for the generated Python class |
| if utils.class_is_action(cls): |
| pyname = cls[10:] |
| elif utils.class_is_oxm(cls): |
| pyname = cls[7:] |
| else: |
| pyname = cls[3:] |
| |
| type_values = get_type_values(cls, version) |
| members = [] |
| type_members = [] |
| |
| pad_count = 0 |
| |
| for member in unified_class['members']: |
| if member['name'] in ['length', 'len']: |
| members.append(LengthMember(name=member['name'], |
| offset=member['offset'], |
| oftype=oftype.OFType(member['m_type'], version))) |
| elif member['name'] in type_values: |
| members.append(TypeMember(name=member['name'], |
| offset=member['offset'], |
| oftype=oftype.OFType(member['m_type'], version), |
| value=type_values[member['name']])) |
| type_members.append(members[-1]) |
| elif member['name'].startswith("pad"): |
| # HACK this should be moved to the frontend |
| pad_oftype = oftype.OFType(member['m_type'], version) |
| length = struct.calcsize("!" + pad_oftype._pack_fmt()) |
| if pad_oftype.is_array: length *= pad_oftype.array_length |
| members.append(PadMember(offset=member['offset'], length=length)) |
| else: |
| members.append(Member(name=member['name'], |
| oftype=oftype.OFType(member['m_type'], version), |
| offset=member['offset'], |
| skip=member['name'] in of_g.skip_members)) |
| |
| ofclasses.append( |
| OFClass(name=cls, |
| pyname=pyname, |
| members=members, |
| type_members=type_members, |
| min_length=of_g.base_length[(cls, version)], |
| is_fixed_length=(cls, version) in of_g.is_fixed_length)) |
| return ofclasses |
| |
| def generate_init(out, name, version): |
| util.render_template(out, 'init.py', version=version) |
| |
| def generate_action(out, name, version): |
| ofclasses = [x for x in build_ofclasses(version) |
| if utils.class_is_action(x.name)] |
| util.render_template(out, 'action.py', ofclasses=ofclasses, version=version) |
| |
| def generate_oxm(out, name, version): |
| ofclasses = [x for x in build_ofclasses(version) |
| if utils.class_is_oxm(x.name)] |
| util.render_template(out, 'oxm.py', ofclasses=ofclasses, version=version) |
| |
| def generate_common(out, name, version): |
| ofclasses = [x for x in build_ofclasses(version) |
| if not utils.class_is_message(x.name) |
| and not utils.class_is_action(x.name) |
| and not utils.class_is_oxm(x.name) |
| and not utils.class_is_list(x.name)] |
| util.render_template(out, 'common.py', ofclasses=ofclasses, version=version) |
| |
| def generate_const(out, name, version): |
| groups = {} |
| for (group, idents) in of_g.identifiers_by_group.items(): |
| items = [] |
| for ident in idents: |
| info = of_g.identifiers[ident] |
| if version in info["values_by_version"]: |
| items.append((info["ofp_name"], info["values_by_version"][version])) |
| if items: |
| groups[group] = items |
| util.render_template(out, 'const.py', version=version, groups=groups) |
| |
| def generate_message(out, name, version): |
| ofclasses = [x for x in build_ofclasses(version) |
| if utils.class_is_message(x.name)] |
| util.render_template(out, 'message.py', ofclasses=ofclasses, version=version) |
| |
| def generate_pp(out, name, version): |
| util.render_template(out, 'pp.py') |
| |
| def generate_util(out, name, version): |
| util.render_template(out, 'util.py') |