| # 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. |
| |
| import sys |
| |
| import re |
| import string |
| import os |
| import glob |
| import copy |
| import collections |
| import c_gen.of_g_legacy as of_g |
| import c_gen.type_maps as type_maps |
| import c_gen.loxi_utils_legacy as loxi_utils |
| import loxi_globals |
| import c_gen.identifiers as identifiers |
| import pyparsing |
| import loxi_front_end.parser as parser |
| import c_gen.translation as translation |
| import loxi_front_end.frontend as frontend |
| from loxi_ir import * |
| from generic_utils import * |
| |
| root_dir = os.path.dirname(os.path.realpath(__file__)) |
| |
| versions = {} |
| # TODO: Put these in a class so they get documented |
| |
| ## Dict indexed by version giving all info related to version |
| # |
| # This is local; after processing, the information is stored in |
| # of_g variables. |
| |
| def add_class(wire_version, cls, members): |
| """ |
| Process a class for the given version and update the unified |
| list of classes as needed. |
| |
| @param wire_version The wire version for this class defn |
| @param cls The name of the class being added |
| @param members The list of members with offsets calculated |
| """ |
| memid = 0 |
| |
| sig = loxi_utils.class_signature(members) |
| if cls in of_g.unified: |
| uc = of_g.unified[cls] |
| if wire_version in uc: |
| debug("Error adding %s to unified. Wire ver %d exists" % |
| (cls, wire_version)) |
| sys.exit(1) |
| uc[wire_version] = {} |
| # Check for a matching signature |
| for wver in uc: |
| if type(wver) != type(0): continue |
| if wver == wire_version: continue |
| if not "use_version" in uc[wver]: |
| if sig == loxi_utils.class_signature(uc[wver]["members"]): |
| log("Matched %s, ver %d to ver %d" % |
| (cls, wire_version, wver)) |
| # have a match with existing version |
| uc[wire_version]["use_version"] = wver |
| # What else to do? |
| return |
| else: # Haven't seen this entry before |
| log("Adding %s to unified list, ver %d" % (cls, wire_version)) |
| of_g.unified[cls] = dict(union={}) |
| uc = of_g.unified[cls] |
| |
| # At this point, need to add members for this version |
| uc[wire_version] = dict(members = members) |
| |
| # Per member processing: |
| # Add to union list (I'm sure there's a better way) |
| # Check if it's a list |
| union = uc["union"] |
| if not cls in of_g.ordered_members: |
| of_g.ordered_members[cls] = [] |
| for member in members: |
| m_name = member["name"] |
| m_type = member["m_type"] |
| if m_name.find("pad") == 0: |
| continue |
| if m_name in union: |
| if not m_type == union[m_name]["m_type"]: |
| debug("ERROR: CLASS: %s. VERSION %d. MEMBER: %s. TYPE: %s" % |
| (cls, wire_version, m_name, m_type)) |
| debug(" Type conflict adding member to unified set.") |
| debug(" Current union[%s]:" % m_name) |
| debug(union[m_name]) |
| sys.exit(1) |
| else: |
| union[m_name] = dict(m_type=m_type, memid=memid) |
| memid += 1 |
| if not m_name in of_g.ordered_members[cls]: |
| of_g.ordered_members[cls].append(m_name) |
| |
| def update_offset(cls, wire_version, name, offset, m_type): |
| """ |
| Update (and return) the offset based on type. |
| @param cls The parent class |
| @param wire_version The wire version being processed |
| @param name The name of the data member |
| @param offset The current offset |
| @param m_type The type declaration being processed |
| @returns A pair (next_offset, len_update) next_offset is the new offset |
| of the next object or -1 if this is a var-length object. len_update |
| is the increment that should be added to the length. Note that (for |
| of_match_v3) it is variable length, but it adds 8 bytes to the fixed |
| length of the object |
| If offset is already -1, do not update |
| Otherwise map to base type and count and update (if possible) |
| """ |
| if offset < 0: # Don't update offset once set to -1 |
| return offset, 0 |
| |
| count, base_type = loxi_utils.type_dec_to_count_base(m_type) |
| |
| len_update = 0 |
| if base_type in of_g.of_mixed_types: |
| base_type = of_g.of_mixed_types[base_type][wire_version] |
| |
| base_class = base_type[:-2] |
| if (base_class, wire_version) in of_g.is_fixed_length: |
| bytes = of_g.base_length[(base_class, wire_version)] |
| else: |
| if base_type == "of_match_v3_t": |
| # This is a special case: it has non-zero min length |
| # but is variable length |
| bytes = -1 |
| len_update = 8 |
| elif base_type in of_g.of_base_types: |
| bytes = of_g.of_base_types[base_type]["bytes"] |
| else: |
| print "UNKNOWN TYPE for %s %s: %s" % (cls, name, base_type) |
| log("UNKNOWN TYPE for %s %s: %s" % (cls, name, base_type)) |
| bytes = -1 |
| |
| # If bytes |
| if bytes > 0: |
| len_update = count * bytes |
| |
| if bytes == -1: |
| return -1, len_update |
| |
| return offset + (count * bytes), len_update |
| |
| def calculate_offsets_and_lengths(ordered_classes, classes, wire_version): |
| """ |
| Generate the offsets for fixed offset class members |
| Also calculate the class_sizes when possible. |
| |
| @param classes The classes to process |
| @param wire_version The wire version for this set of classes |
| |
| Updates global variables |
| """ |
| |
| lists = set() |
| |
| # Generate offsets |
| for cls in ordered_classes: |
| fixed_offset = 0 # The last "good" offset seen |
| offset = 0 |
| last_offset = 0 |
| last_name = "-" |
| for member in classes[cls]: |
| m_type = member["m_type"] |
| name = member["name"] |
| if last_offset == -1: |
| if name == "pad": |
| log("Skipping pad for special offset for %s" % cls) |
| else: |
| log("SPECIAL OFS: Member %s (prev %s), class %s ver %d" % |
| (name, last_name, cls, wire_version)) |
| if (((cls, name) in of_g.special_offsets) and |
| (of_g.special_offsets[(cls, name)] != last_name)): |
| debug("ERROR: special offset prev name changed") |
| debug(" cls %s. name %s. version %d. was %s. now %s" % |
| cls, name, wire_version, |
| of_g.special_offsets[(cls, name)], last_name) |
| sys.exit(1) |
| of_g.special_offsets[(cls, name)] = last_name |
| |
| member["offset"] = offset |
| if m_type.find("list(") == 0: |
| (list_name, base_type) = loxi_utils.list_name_extract(m_type) |
| lists.add(list_name) |
| member["m_type"] = list_name + "_t" |
| offset = -1 |
| elif m_type.find("struct") == 0: |
| debug("ERROR found struct: %s.%s " % (cls, name)) |
| sys.exit(1) |
| elif m_type == "octets": |
| log("offset gen skipping octets: %s.%s " % (cls, name)) |
| offset = -1 |
| else: |
| offset, len_update = update_offset(cls, wire_version, name, |
| offset, m_type) |
| if offset != -1: |
| fixed_offset = offset |
| else: |
| fixed_offset += len_update |
| log("offset is -1 for %s.%s version %d " % |
| (cls, name, wire_version)) |
| last_offset = offset |
| last_name = name |
| of_g.base_length[(cls, wire_version)] = fixed_offset |
| if (offset != -1): |
| of_g.is_fixed_length.add((cls, wire_version)) |
| for list_type in lists: |
| classes[list_type] = [] |
| of_g.ordered_classes[wire_version].append(list_type) |
| of_g.base_length[(list_type, wire_version)] = 0 |
| |
| def order_and_assign_object_ids(): |
| """ |
| Order all classes and assign object ids to all classes. |
| |
| This is done to promote a reasonable order of the objects, putting |
| messages first followed by non-messages. No assumptions should be |
| made about the order, nor about contiguous numbering. However, the |
| numbers should all be reasonably small allowing arrays indexed by |
| these enum values to be defined. |
| """ |
| |
| # Generate separate message and non-message ordered lists |
| for cls in of_g.unified: |
| if loxi_utils.class_is_message(cls): |
| of_g.ordered_messages.append(cls) |
| elif loxi_utils.class_is_list(cls): |
| of_g.ordered_list_objects.append(cls) |
| else: |
| of_g.ordered_non_messages.append(cls) |
| |
| of_g.ordered_messages.sort() |
| of_g.ordered_pseudo_objects.sort() |
| of_g.ordered_non_messages.sort() |
| of_g.ordered_list_objects.sort() |
| of_g.standard_class_order.extend(of_g.ordered_messages) |
| of_g.standard_class_order.extend(of_g.ordered_non_messages) |
| of_g.standard_class_order.extend(of_g.ordered_list_objects) |
| |
| # This includes pseudo classes for which most code is not generated |
| of_g.all_class_order.extend(of_g.ordered_messages) |
| of_g.all_class_order.extend(of_g.ordered_non_messages) |
| of_g.all_class_order.extend(of_g.ordered_list_objects) |
| of_g.all_class_order.extend(of_g.ordered_pseudo_objects) |
| |
| # Assign object IDs |
| for cls in of_g.ordered_messages: |
| of_g.unified[cls]["object_id"] = of_g.object_id |
| of_g.object_id += 1 |
| for cls in of_g.ordered_non_messages: |
| of_g.unified[cls]["object_id"] = of_g.object_id |
| of_g.object_id += 1 |
| for cls in of_g.ordered_list_objects: |
| of_g.unified[cls]["object_id"] = of_g.object_id |
| of_g.object_id += 1 |
| for cls in of_g.ordered_pseudo_objects: |
| of_g.unified[cls] = {} |
| of_g.unified[cls]["object_id"] = of_g.object_id |
| of_g.object_id += 1 |
| |
| |
| def initialize_versions(): |
| """ |
| Create an empty datastructure for each target version. |
| """ |
| |
| for version in loxi_globals.OFVersions.target_versions: |
| wire_version = version.wire_version |
| version_name = of_g.of_version_wire2name[wire_version] |
| of_g.wire_ver_map[wire_version] = version_name |
| versions[version_name] = dict( |
| version_name = version_name, |
| wire_version = wire_version, |
| classes = {}) |
| of_g.ordered_classes[wire_version] = [] |
| |
| of_g.target_version_list = [ v.wire_version for v in loxi_globals.OFVersions.target_versions ] |
| |
| def build_ordered_classes(): |
| """ |
| Read in from files given on command line and update global state |
| |
| @fixme Should select versions to support from command line |
| """ |
| |
| for version, protocol in loxi_globals.ir.items(): |
| wire_version = version.wire_version |
| # Populate global state |
| version_name = of_g.of_version_wire2name[wire_version] |
| |
| for ofclass in protocol.classes: |
| of_g.ordered_classes[wire_version].append(ofclass.name) |
| legacy_members = [] |
| pad_count = 0 |
| for m in ofclass.members: |
| if type(m) == OFPadMember: |
| m_name = 'pad%d' % pad_count |
| if m_name == 'pad0': m_name = 'pad' |
| legacy_members.append(dict(m_type='uint8_t[%d]' % m.length, |
| name=m_name)) |
| pad_count += 1 |
| else: |
| # HACK the C backend does not yet support of_oxm_t |
| if m.oftype == 'of_oxm_t': |
| m_type = 'of_octets_t' |
| else: |
| enum = find(lambda e: e.name == m.oftype, protocol.enums) |
| if enum and "wire_type" in enum.params: |
| m_type = enum.params["wire_type"] |
| else: |
| m_type = m.oftype |
| legacy_members.append(dict(m_type=m_type, name=m.name)) |
| versions[version_name]['classes'][ofclass.name] = legacy_members |
| |
| for enum in protocol.enums: |
| for entry in enum.entries: |
| identifiers.add_identifier( |
| translation.loxi_name(entry.name), |
| entry.name, enum.name, entry.value, wire_version, |
| of_g.identifiers, of_g.identifiers_by_group) |
| |
| def populate_type_maps(): |
| """ |
| Use the type members in the IR to fill out the legacy type_maps. |
| """ |
| |
| def split_inherited_cls(cls): |
| if cls == 'of_meter_band_stats': # HACK not a subtype of of_meter_band |
| return None, None |
| for parent in sorted(type_maps.inheritance_data.keys(), reverse=True): |
| if cls.startswith(parent): |
| return (parent, cls[len(parent)+1:]) |
| return None, None |
| |
| def find_experimenter(parent, cls): |
| for experimenter in sorted(of_g.experimenter_name_to_id.keys(), reverse=True): |
| prefix = parent + '_' + experimenter |
| if cls.startswith(prefix) and cls != prefix: |
| return experimenter |
| return None |
| |
| def find_type_value(ofclass, m_name): |
| for m in ofclass.members: |
| if isinstance(m, OFTypeMember) and m.name == m_name: |
| return m.value |
| raise KeyError("ver=%d, cls=%s, m_name=%s" % (wire_version, cls, m_name)) |
| |
| # Most inheritance classes: actions, instructions, etc |
| for version, protocol in loxi_globals.ir.items(): |
| wire_version = version.wire_version |
| for ofclass in protocol.classes: |
| cls = ofclass.name |
| parent, subcls = split_inherited_cls(cls) |
| if not (parent and subcls): |
| continue |
| if parent == 'of_oxm': |
| type_len = find_type_value(ofclass, 'type_len') |
| oxm_class = (type_len >> 16) & 0xffff |
| if oxm_class != 0x8000: |
| # Do not include experimenter OXMs in the main table |
| val = type_maps.invalid_type |
| else: |
| val = (type_len >> 8) & 0xff |
| else: |
| val = find_type_value(ofclass, 'type') |
| type_maps.inheritance_data[parent][wire_version][subcls] = val |
| |
| # Extensions (only actions for now) |
| experimenter = find_experimenter(parent, cls) |
| if parent == 'of_action' and experimenter: |
| val = find_type_value(ofclass, 'subtype') |
| type_maps.extension_action_subtype[wire_version][experimenter][cls] = val |
| if wire_version >= of_g.VERSION_1_3: |
| cls2 = parent + "_id" + cls[len(parent):] |
| type_maps.extension_action_id_subtype[wire_version][experimenter][cls2] = val |
| elif parent == 'of_instruction' and experimenter: |
| val = find_type_value(ofclass, 'subtype') |
| type_maps.extension_instruction_subtype[wire_version][experimenter][cls] = val |
| |
| # Messages |
| for version, protocol in loxi_globals.ir.items(): |
| wire_version = version.wire_version |
| for ofclass in protocol.classes: |
| cls = ofclass.name |
| # HACK (though this is what loxi_utils.class_is_message() does) |
| if not [x for x in ofclass.members if isinstance(x, OFDataMember) and x.name == 'xid']: |
| continue |
| if type_maps.class_is_virtual(cls): |
| continue |
| subcls = cls[3:] |
| val = find_type_value(ofclass, 'type') |
| if not val in type_maps.message_types[wire_version].values(): |
| type_maps.message_types[wire_version][subcls] = val |
| |
| # Extensions |
| experimenter = find_experimenter('of', cls) |
| if experimenter and ofclass.is_subclassof("of_experimenter"): |
| val = find_type_value(ofclass, 'subtype') |
| type_maps.extension_message_subtype[wire_version][experimenter][cls] = val |
| |
| type_maps.generate_maps() |
| |
| def analyze_input(): |
| """ |
| Add information computed from the input, including offsets and |
| lengths of struct members and the set of list and action_id types. |
| """ |
| |
| # Generate header classes for inheritance parents |
| for wire_version, ordered_classes in of_g.ordered_classes.items(): |
| classes = versions[of_g.of_version_wire2name[wire_version]]['classes'] |
| for cls in ordered_classes: |
| if cls in type_maps.inheritance_map: |
| new_cls = cls + '_header' |
| of_g.ordered_classes[wire_version].append(new_cls) |
| classes[new_cls] = classes[cls] |
| |
| for wire_version in of_g.wire_ver_map.keys(): |
| version_name = of_g.of_version_wire2name[wire_version] |
| calculate_offsets_and_lengths( |
| of_g.ordered_classes[wire_version], |
| versions[version_name]['classes'], |
| wire_version) |
| |
| def unify_input(): |
| """ |
| Create Unified View of Objects |
| """ |
| |
| global versions |
| |
| # Add classes to unified in wire-format order so that it is easier |
| # to generate things later |
| keys = versions.keys() |
| keys.sort(reverse=True) |
| for version in keys: |
| wire_version = versions[version]["wire_version"] |
| classes = versions[version]["classes"] |
| for cls in of_g.ordered_classes[wire_version]: |
| add_class(wire_version, cls, classes[cls]) |
| |
| |
| def log_all_class_info(): |
| """ |
| Log the results of processing the input |
| |
| Debug function |
| """ |
| |
| for cls in of_g.unified: |
| for v in of_g.unified[cls]: |
| if type(v) == type(0): |
| log("cls: %s. ver: %d. base len %d. %s" % |
| (str(cls), v, of_g.base_length[(cls, v)], |
| loxi_utils.class_is_var_len(cls,v) and "not fixed" |
| or "fixed")) |
| if "use_version" in of_g.unified[cls][v]: |
| log("cls %s: v %d mapped to %d" % (str(cls), v, |
| of_g.unified[cls][v]["use_version"])) |
| if "members" in of_g.unified[cls][v]: |
| for member in of_g.unified[cls][v]["members"]: |
| log(" %-20s: type %-20s. offset %3d" % |
| (member["name"], member["m_type"], |
| member["offset"])) |
| |
| def generate_all_files(): |
| """ |
| Create the files for the language target |
| """ |
| for (name, fn) in lang_module.targets.items(): |
| path = of_g.options.install_dir + '/' + name |
| os.system("mkdir -p %s" % os.path.dirname(path)) |
| with open(path, "w") as outfile: |
| fn(outfile, os.path.basename(name)) |
| print("Wrote contents for " + name) |
| |
| if __name__ == '__main__': |
| of_g.loxigen_log_file = open("loxigen.log", "w") |
| of_g.loxigen_dbg_file = sys.stdout |
| |
| of_g.process_commandline() |
| # @fixme Use command line params to select log |
| |
| if not config_sanity_check(): |
| debug("Config sanity check failed\n") |
| sys.exit(1) |
| |
| # Import the language file |
| lang_file = "lang_%s" % of_g.options.lang |
| lang_module = __import__(lang_file) |
| |
| # If list files, just list auto-gen files to stdout and exit |
| if of_g.options.list_files: |
| for name in lang_module.targets: |
| print of_g.options.install_dir + '/' + name |
| sys.exit(0) |
| |
| log("\nGenerating files for target language %s\n" % of_g.options.lang) |
| |
| initialize_versions() |
| read_input() |
| populate_type_maps() |
| analyze_input() |
| unify_input() |
| order_and_assign_object_ids() |
| log_all_class_info() |
| generate_all_files() |