canonicalize.py

#
# Copyright 2019 Advanced Micro Devices, Inc.
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"""
Helper script that was used during the generation of the JSON data.

  usage: python3 canonicalize.py FILE

Reads the register database from FILE, performs canonicalization
(de-duplication of enums and register types, implicitly sorting JSON by name)
and attempts to deduce missing register types.

Notes about deduced register types as well as the output JSON are printed on
stdout.
"""

from __future__ import absolute_import, division, print_function, unicode_literals

from collections import defaultdict
import json
import re
import sys

from regdb import RegisterDatabase, deduplicate_enums, deduplicate_register_types

RE_number = re.compile('[0-9]+')

def deduce_missing_register_types(regdb):
    """
    This is a heuristic for filling in missing register types based on
    sequentially named registers.
    """
    buckets = defaultdict(list)
    for regmap in regdb.register_mappings():
        buckets[RE_number.sub('0', regmap.name)].append(regmap)

    for bucket in buckets.values():
        if len(bucket) <= 1:
            continue

        regtypenames = set(
            regmap.type_ref for regmap in bucket if hasattr(regmap, 'type_ref')
        )
        if len(regtypenames) == 1:
            regtypename = regtypenames.pop()
            for regmap in bucket:
                if not hasattr(regmap, 'type_ref'):
                    print('Deducing {0} -> {1}'.format(regmap.name, regtypename), file=sys.stderr)
                regmap.type_ref = regtypename


def json_canonicalize(filp, chips = None):
    regdb = RegisterDatabase.from_json(json.load(filp))

    if chips is not None:
        for regmap in regdb.register_mappings():
            assert not hasattr(regmap, 'chips')
            regmap.chips = [chips]

    deduplicate_enums(regdb)
    deduplicate_register_types(regdb)
    deduce_missing_register_types(regdb)
    regdb.garbage_collect()

    return regdb.encode_json_pretty()


def main():
    print(json_canonicalize(open(sys.argv[1], 'r'), sys.argv[2]))

if __name__ == '__main__':
    main()

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