#!/usr/bin/env python
# esp32ulp_mapgen utility converts a symbol list provided by nm into an export script
# for the linker and a header file.
#
# Copyright (c) 2016-2017 Espressif Systems (Shanghai) PTE LTD.
# Distributed under the terms of Apache License v2.0 found in the top-level LICENSE file.

from __future__ import print_function
from optparse import OptionParser
import sys

BASE_ADDR = 0x50000000


def gen_ld_h_from_sym(f_sym, f_ld, f_h):
    f_ld.write("/* Variable definitions for ESP32ULP linker\n")
    f_ld.write(" * This file is generated automatically by esp32ulp_mapgen.py utility.\n")
    f_ld.write(" */\n\n")
    f_h.write("// Variable definitions for ESP32ULP\n")
    f_h.write("// This file is generated automatically by esp32ulp_mapgen.py utility\n\n")
    f_h.write("#pragma once\n\n")

    for line in f_sym:
        name, _, addr_str = line.split()
        addr = int(addr_str, 16) + BASE_ADDR
        f_h.write("extern uint32_t ulp_{0};\n".format(name))
        f_ld.write("PROVIDE ( ulp_{0} = 0x{1:08x} );\n".format(name, addr))


def main():
    if sys.version_info[0] < 3:
        print("WARNING: Support for Python 2 is deprecated and will be removed in future versions.", file=sys.stderr)
    elif sys.version_info[0] == 3 and sys.version_info[1] < 6:
        print("WARNING: Python 3 versions older than 3.6 are not supported.", file=sys.stderr)
    description = ("This application generates .h and .ld files for symbols defined in input file. "
                   "The input symbols file can be generated using nm utility like this: "
                   "esp32-ulp-nm -g -f posix <elf_file> > <symbols_file>")

    parser = OptionParser(description=description)
    parser.add_option("-s", "--symfile", dest="symfile",
                      help="symbols file name", metavar="SYMFILE")
    parser.add_option("-o", "--outputfile", dest="outputfile",
                      help="destination .h and .ld files name prefix", metavar="OUTFILE")

    (options, args) = parser.parse_args()
    if options.symfile is None:
        parser.print_help()
        return 1

    if options.outputfile is None:
        parser.print_help()
        return 1

    with open(options.outputfile + ".h", 'w') as f_h, open(options.outputfile + ".ld", 'w') as f_ld, open(options.symfile) as f_sym:
        gen_ld_h_from_sym(f_sym, f_ld, f_h)
    return 0


if __name__ == "__main__":
    exit(main())