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# 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
from loxi_ir import *
ofclasses_by_version = {}
PyOFClass = namedtuple('PyOFClass', ['name', 'pyname', 'members', 'type_members',
'min_length', 'is_fixed_length',
'has_internal_alignment', 'has_external_alignment'])
# Return the name for the generated Python class
def generate_pyname(cls):
if utils.class_is_action(cls):
return cls[10:]
elif utils.class_is_oxm(cls):
return cls[7:]
elif utils.class_is_meter_band(cls):
return cls[14:]
elif utils.class_is_instruction(cls):
return cls[15:]
else:
return cls[3:]
# Create intermediate representation, extended from the LOXI IR
# HACK the oftype member attribute is replaced with an OFType instance
def build_ofclasses(version):
ofclasses = []
for ofclass in of_g.ir[version].classes:
cls = ofclass.name
if ofclass.virtual:
continue
members = []
type_members = []
for m in ofclass.members:
if type(m) == OFTypeMember:
members.append(m)
type_members.append(members[-1])
elif type(m) == OFLengthMember:
members.append(m)
elif type(m) == OFFieldLengthMember:
members.append(m)
elif type(m) == OFPadMember:
members.append(m)
elif type(m) == OFDataMember:
if utils.class_is_message(ofclass.name) and m.name == 'version':
# HACK move to frontend
members.append(OFTypeMember(
name=m.name,
oftype=m.oftype,
value=version))
type_members.append(members[-1])
else:
members.append(m)
ofclasses.append(
PyOFClass(name=cls,
pyname=generate_pyname(cls),
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,
has_internal_alignment=cls == 'of_action_set_field',
has_external_alignment=cls == 'of_match_v3'))
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 ofclasses_by_version[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 ofclasses_by_version[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 ofclasses_by_version[version]
if not utils.class_is_message(x.name)
and not utils.class_is_action(x.name)
and not utils.class_is_instruction(x.name)
and not utils.class_is_meter_band(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):
util.render_template(out, 'const.py', version=version,
enums=of_g.ir[version].enums)
def generate_instruction(out, name, version):
ofclasses = [x for x in ofclasses_by_version[version]
if utils.class_is_instruction(x.name)]
util.render_template(out, 'instruction.py', ofclasses=ofclasses, version=version)
def generate_message(out, name, version):
ofclasses = [x for x in ofclasses_by_version[version]
if utils.class_is_message(x.name)]
util.render_template(out, 'message.py', ofclasses=ofclasses, version=version)
def generate_meter_band(out, name, version):
ofclasses = [x for x in ofclasses_by_version[version]
if utils.class_is_meter_band(x.name)]
util.render_template(out, 'meter_band.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', version=version)
def init():
for version in of_g.supported_wire_protos:
ofclasses_by_version[version] = build_ofclasses(version)