blob: ab98c26d3f5e07fc8613d255fd34bdada88f5dd1 [file] [log] [blame]
Rich Laned47e5a22013-05-09 14:21:16 -07001# Copyright 2013, Big Switch Networks, Inc.
2#
3# LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with
4# the following special exception:
5#
6# LOXI Exception
7#
8# As a special exception to the terms of the EPL, you may distribute libraries
9# generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided
10# that copyright and licensing notices generated by LoxiGen are not altered or removed
11# from the LoxiGen Libraries and the notice provided below is (i) included in
12# the LoxiGen Libraries, if distributed in source code form and (ii) included in any
13# documentation for the LoxiGen Libraries, if distributed in binary form.
14#
15# Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler."
16#
17# You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain
18# a copy of the EPL at:
19#
20# http://www.eclipse.org/legal/epl-v10.html
21#
22# Unless required by applicable law or agreed to in writing, software
23# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
24# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
25# EPL for the specific language governing permissions and limitations
26# under the EPL.
27
Rich Lane4d9f0f62013-05-09 15:50:57 -070028import copy
Rich Laned47e5a22013-05-09 14:21:16 -070029import of_g
30import loxi_front_end.type_maps as type_maps
Rich Lane4d9f0f62013-05-09 15:50:57 -070031from loxi_ir import *
Rich Laned47e5a22013-05-09 14:21:16 -070032
33class InputError(Exception):
34 pass
35
Rich Lane4d9f0f62013-05-09 15:50:57 -070036def create_member(m_ast):
37 if m_ast[0] == 'pad':
38 return OFPadMember(length=m_ast[1])
Rich Lane32142872013-05-09 21:16:47 -070039 elif m_ast[0] == 'type':
40 return OFTypeMember(name=m_ast[2], oftype=m_ast[1], value=m_ast[3])
Rich Lanef424e972013-05-09 21:00:13 -070041 elif m_ast[0] == 'data':
42 if m_ast[2] == 'length' or m_ast[2] == 'len': # Should be moved to parser
43 return OFLengthMember(name=m_ast[2], oftype=m_ast[1])
44 elif m_ast[2] == 'actions_len':
45 # HACK only usage so far
46 return OFFieldLengthMember(name=m_ast[2], oftype=m_ast[1], field_name='actions')
47 else:
48 return OFDataMember(name=m_ast[2], oftype=m_ast[1])
Rich Lane4d9f0f62013-05-09 15:50:57 -070049
Rich Laned47e5a22013-05-09 14:21:16 -070050def create_ofinput(ast):
51 """
52 Create an OFInput from an AST
53
54 @param ast An AST as returned by loxi_front_end.parser.parse
55
56 @returns An OFInput object
57 """
58
Rich Lane4d9f0f62013-05-09 15:50:57 -070059 ofinput = OFInput(wire_versions=set(), classes=[], enums=[])
Rich Laned47e5a22013-05-09 14:21:16 -070060
Rich Lane4d9f0f62013-05-09 15:50:57 -070061 for decl_ast in ast:
62 if decl_ast[0] == 'struct':
63 members = [create_member(m_ast) for m_ast in decl_ast[2]]
64 ofclass = OFClass(name=decl_ast[1], members=members)
65 ofinput.classes.append(ofclass)
Rich Lane4d9f0f62013-05-09 15:50:57 -070066 if decl_ast[0] == 'enum':
67 enum = OFEnum(name=decl_ast[1], values=[(x[0], x[1]) for x in decl_ast[2]])
68 ofinput.enums.append(enum)
69 elif decl_ast[0] == 'metadata':
70 if decl_ast[1] == 'version':
71 if decl_ast[2] == 'any':
Rich Laned47e5a22013-05-09 14:21:16 -070072 ofinput.wire_versions.update(of_g.wire_ver_map.keys())
Rich Lane4d9f0f62013-05-09 15:50:57 -070073 elif int(decl_ast[2]) in of_g.supported_wire_protos:
74 ofinput.wire_versions.add(int(decl_ast[2]))
Rich Laned47e5a22013-05-09 14:21:16 -070075 else:
Rich Lane4d9f0f62013-05-09 15:50:57 -070076 raise InputError("Unrecognized wire protocol version %r" % decl_ast[2])
Rich Laned47e5a22013-05-09 14:21:16 -070077 found_wire_version = True
78
79 if not ofinput.wire_versions:
80 raise InputError("Missing #version metadata")
81
82 return ofinput