esp-idf/tools/gen_soc_caps_kconfig/gen_soc_caps_kconfig.py

#!/usr/bin/env python
#
# SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
# SPDX-License-Identifier: Apache-2.0
"""
Generate Kconfig.soc_caps.in with defines from soc_caps.h
"""
import argparse
import inspect
import io
import logging
import sys
from difflib import unified_diff
from os import path
from pathlib import Path
from string import Template

import pyparsing
from pyparsing import alphas
from pyparsing import CaselessLiteral
from pyparsing import Char
from pyparsing import Combine
from pyparsing import Group
from pyparsing import hexnums
from pyparsing import Literal
from pyparsing import nums
from pyparsing import OneOrMore
from pyparsing import Optional
from pyparsing import ParserElement
from pyparsing import QuotedString
from pyparsing import Word

pyparsing.usePackrat = True

try:
    import typing  # noqa: F401 # pylint: disable=unused-import
except ImportError:
    pass


class KconfigWriter():
    PREAMBLE = inspect.cleandoc('''
        #####################################################
        # This file is auto-generated from SoC caps
        # using gen_soc_caps_kconfig.py, do not edit manually
        #####################################################
        ''')

    KCONFIG_ENTRY_TEMPLATE = Template(
        inspect.cleandoc('''
            config $name
                $entry_type
                default $value
            '''))

    def __init__(self):  # type: () -> None
        self.entries = set('')

        self.kconfig_text = io.StringIO('')
        self.kconfig_text.write(self.PREAMBLE)

    def add_entry(self, name, entry_type, value):  # type: (str, str, typing.Any) -> None

        if name in self.entries:
            logging.info('Duplicate entry: {}'.format(name))
            return

        self.entries.add(name)
        self.kconfig_text.write('\n\n')

        # Format values for kconfig
        if entry_type == 'bool':
            value = 'y' if value else 'n'
        elif entry_type == 'string':
            value = '"' + value + '"'

        entry = self.KCONFIG_ENTRY_TEMPLATE.substitute(name=name, entry_type=entry_type, value=value)
        self.kconfig_text.write(entry)

    def update_file(self, kconfig_path, always_write):  # type: (Path, bool) -> bool

        try:
            with open(kconfig_path, 'r') as f:
                old_content = f.readlines()
        except FileNotFoundError:
            old_content = ['']

        self.kconfig_text.seek(0)
        new_content = self.kconfig_text.readlines()
        new_content[-1] += '\n'  # Add final newline to end of file

        file_needs_update = always_write

        # Check if file was updated and print diff for users
        diff = unified_diff(old_content, new_content, fromfile=str(kconfig_path), n=2)
        for line in diff:
            print(line, end='')
            file_needs_update = True

        if file_needs_update:
            print('\n' + 'Updating file: {}'.format(kconfig_path))
            with open(kconfig_path, 'w') as f:
                f.writelines(new_content)

        return file_needs_update


def parse_define(define_line):  # type: (str) -> typing.Any[typing.Type[ParserElement]]

    # Group for parsing literal suffix of a numbers, e.g. 100UL
    literal_symbol = Group(CaselessLiteral('L') | CaselessLiteral('U'))
    literal_suffix = OneOrMore(literal_symbol)

    # Define name
    name = Word(alphas, alphas + nums + '_')

    # Define value, either a hex, int or a string
    hex_value = Combine(Literal('0x') + Word(hexnums) + Optional(literal_suffix).suppress())('hex_value')
    int_value = Combine(Optional('-') + Word(nums))('int_value') + ~Char('.') + Optional(literal_suffix)('literal_suffix')
    str_value = QuotedString('"')('str_value')

    # Remove optional parenthesis around values
    value = Optional('(').suppress() + (hex_value ^ int_value ^ str_value)('value')  + Optional(')').suppress()

    expr = '#define' + Optional(name)('name') + Optional(value)
    res = expr.parseString(define_line)

    return res


def generate_defines(soc_caps_dir, filename, always_write):  # type: (Path, str, bool) -> bool

    soc_headers = list(soc_caps_dir.glob(filename))
    if soc_headers == []:
        return False

    # Sort header files to make the generated files deterministic
    soc_headers.sort(key=lambda file: file.name)

    defines = []
    for soc_header in soc_headers:
        defines.extend(get_defines(soc_header))

    writer = KconfigWriter()

    for line in defines:

        try:
            res = parse_define(line)
        except pyparsing.ParseException:
            logging.debug('Failed to parse: {}'.format(line))
            continue

        # Add the kconfig entry corresponding to the type we parsed
        if 'str_value' in res:
            writer.add_entry(res.name, 'string', res.str_value)
        elif 'int_value' in res:
            # defines with an integer value of 0 or 1 are
            # added as bool entries as long they have no literal suffix
            if 'literal_suffix' not in res and res.int_value == '0':
                writer.add_entry(res.name, 'bool', False)
            elif 'literal_suffix' not in res and res.int_value == '1':
                writer.add_entry(res.name, 'bool', True)
            else:
                writer.add_entry(res.name, 'int', res.int_value)
        elif 'hex_value' in res:
            writer.add_entry(res.name, 'hex', res.hex_value)

    # Updates output if necessary
    updated = writer.update_file(Path(soc_caps_dir) / 'Kconfig.soc_caps.in', always_write)

    return updated


def get_defines(header_path):  # type: (Path) -> list[str]
    defines = []
    logging.info('Reading macros from {}...'.format(header_path))
    with open(header_path, 'r') as f:
        output = f.read()

    for line in output.split('\n'):
        line = line.strip()
        if len(line):
            defines.append(line)

    return defines


if __name__ == '__main__':

    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('-d', '--dir', help='SoC caps folder paths, support wildcards', nargs='+', default=[])
    parser.add_argument('-n', '--filename', nargs='?', default='*caps.h',
                        help='SoC caps filename, support wildcards')
    parser.add_argument('-v', '--verbose', action='count', help='Increase the logging level of the script. Can be specified multiple times.')
    parser.add_argument('--always-write', help='Always generate new output files', action='store_true')
    args = parser.parse_args()

    if not args.verbose:
        log_level = logging.WARNING
    elif args.verbose == 1:
        log_level = logging.INFO
    else:
        log_level = logging.DEBUG

    logging.basicConfig(level=log_level)

    files_updated = []
    for caps_dir in args.dir:
        soc_caps_dirs = Path().glob(caps_dir)
        files_updated += [generate_defines(d, args.filename, args.always_write) for d in soc_caps_dirs if path.isdir(d)]

    print('Updated {} files'.format(sum(files_updated)))

    sys.exit(all(files_updated))