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circuitpython/tools/mpy-tool.py
Damien George dd11af209d py: Add LOAD_SUPER_METHOD bytecode to allow heap-free super meth calls. 
This patch allows the following code to run without allocating on the heap:

    super().foo(...)

Before this patch such a call would allocate a super object on the heap and
then load the foo method and call it right away.  The super object is only
needed to perform the lookup of the method and not needed after that.  This
patch makes an optimisation to allocate the super object on the C stack and
discard it right after use.

Changes in code size due to this patch are:

   bare-arm: +128
    minimal: +232
   unix x64: +416
unix nanbox: +364
     stmhal: +184
    esp8266: +340
     cc3200: +128
2017-04-22 23:39:20 +10:00

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#!/usr/bin/env python3
#
# This file is part of the MicroPython project, http://micropython.org/
#
# The MIT License (MIT)
#
# Copyright (c) 2016 Damien P. George
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# Python 2/3 compatibility code
from __future__ import print_function
import platform
if platform.python_version_tuple()[0] == '2':
str_cons = lambda val, enc=None: val
bytes_cons = lambda val, enc=None: bytearray(val)
is_str_type = lambda o: type(o) is str
is_bytes_type = lambda o: type(o) is bytearray
is_int_type = lambda o: type(o) is int or type(o) is long
else:
str_cons = str
bytes_cons = bytes
is_str_type = lambda o: type(o) is str
is_bytes_type = lambda o: type(o) is bytes
is_int_type = lambda o: type(o) is int
# end compatibility code
import sys
import struct
from collections import namedtuple
sys.path.append('../py')
import makeqstrdata as qstrutil
class FreezeError(Exception):
def __init__(self, rawcode, msg):
self.rawcode = rawcode
self.msg = msg
def __str__(self):
return 'error while freezing %s: %s' % (self.rawcode.source_file, self.msg)
class Config:
MPY_VERSION = 2
MICROPY_LONGINT_IMPL_NONE = 0
MICROPY_LONGINT_IMPL_LONGLONG = 1
MICROPY_LONGINT_IMPL_MPZ = 2
config = Config()
MP_OPCODE_BYTE = 0
MP_OPCODE_QSTR = 1
MP_OPCODE_VAR_UINT = 2
MP_OPCODE_OFFSET = 3
# extra bytes:
MP_BC_MAKE_CLOSURE = 0x62
MP_BC_MAKE_CLOSURE_DEFARGS = 0x63
MP_BC_RAISE_VARARGS = 0x5c
# extra byte if caching enabled:
MP_BC_LOAD_NAME = 0x1c
MP_BC_LOAD_GLOBAL = 0x1d
MP_BC_LOAD_ATTR = 0x1e
MP_BC_STORE_ATTR = 0x26
def make_opcode_format():
def OC4(a, b, c, d):
return a | (b << 2) | (c << 4) | (d << 6)
U = 0
B = 0
Q = 1
V = 2
O = 3
return bytes_cons((
# this table is taken verbatim from py/bc.c
OC4(U, U, U, U), # 0x00-0x03
OC4(U, U, U, U), # 0x04-0x07
OC4(U, U, U, U), # 0x08-0x0b
OC4(U, U, U, U), # 0x0c-0x0f
OC4(B, B, B, U), # 0x10-0x13
OC4(V, U, Q, V), # 0x14-0x17
OC4(B, V, V, Q), # 0x18-0x1b
OC4(Q, Q, Q, Q), # 0x1c-0x1f
OC4(B, B, V, V), # 0x20-0x23
OC4(Q, Q, Q, B), # 0x24-0x27
OC4(V, V, Q, Q), # 0x28-0x2b
OC4(U, U, U, U), # 0x2c-0x2f
OC4(B, B, B, B), # 0x30-0x33
OC4(B, O, O, O), # 0x34-0x37
OC4(O, O, U, U), # 0x38-0x3b
OC4(U, O, B, O), # 0x3c-0x3f
OC4(O, B, B, O), # 0x40-0x43
OC4(B, B, O, U), # 0x44-0x47
OC4(U, U, U, U), # 0x48-0x4b
OC4(U, U, U, U), # 0x4c-0x4f
OC4(V, V, U, V), # 0x50-0x53
OC4(B, U, V, V), # 0x54-0x57
OC4(V, V, V, B), # 0x58-0x5b
OC4(B, B, B, U), # 0x5c-0x5f
OC4(V, V, V, V), # 0x60-0x63
OC4(V, V, V, V), # 0x64-0x67
OC4(Q, Q, B, U), # 0x68-0x6b
OC4(U, U, U, U), # 0x6c-0x6f
OC4(B, B, B, B), # 0x70-0x73
OC4(B, B, B, B), # 0x74-0x77
OC4(B, B, B, B), # 0x78-0x7b
OC4(B, B, B, B), # 0x7c-0x7f
OC4(B, B, B, B), # 0x80-0x83
OC4(B, B, B, B), # 0x84-0x87
OC4(B, B, B, B), # 0x88-0x8b
OC4(B, B, B, B), # 0x8c-0x8f
OC4(B, B, B, B), # 0x90-0x93
OC4(B, B, B, B), # 0x94-0x97
OC4(B, B, B, B), # 0x98-0x9b
OC4(B, B, B, B), # 0x9c-0x9f
OC4(B, B, B, B), # 0xa0-0xa3
OC4(B, B, B, B), # 0xa4-0xa7
OC4(B, B, B, B), # 0xa8-0xab
OC4(B, B, B, B), # 0xac-0xaf
OC4(B, B, B, B), # 0xb0-0xb3
OC4(B, B, B, B), # 0xb4-0xb7
OC4(B, B, B, B), # 0xb8-0xbb
OC4(B, B, B, B), # 0xbc-0xbf
OC4(B, B, B, B), # 0xc0-0xc3
OC4(B, B, B, B), # 0xc4-0xc7
OC4(B, B, B, B), # 0xc8-0xcb
OC4(B, B, B, B), # 0xcc-0xcf
OC4(B, B, B, B), # 0xd0-0xd3
OC4(B, B, B, B), # 0xd4-0xd7
OC4(B, B, B, B), # 0xd8-0xdb
OC4(B, B, B, B), # 0xdc-0xdf
OC4(B, B, B, B), # 0xe0-0xe3
OC4(B, B, B, B), # 0xe4-0xe7
OC4(B, B, B, B), # 0xe8-0xeb
OC4(B, B, B, B), # 0xec-0xef
OC4(B, B, B, B), # 0xf0-0xf3
OC4(B, B, B, B), # 0xf4-0xf7
OC4(B, B, B, U), # 0xf8-0xfb
OC4(U, U, U, U), # 0xfc-0xff
))
# this function mirrors that in py/bc.c
def mp_opcode_format(bytecode, ip, opcode_format=make_opcode_format()):
opcode = bytecode[ip]
ip_start = ip
f = (opcode_format[opcode >> 2] >> (2 * (opcode & 3))) & 3
if f == MP_OPCODE_QSTR:
ip += 3
else:
extra_byte = (
opcode == MP_BC_RAISE_VARARGS
or opcode == MP_BC_MAKE_CLOSURE
or opcode == MP_BC_MAKE_CLOSURE_DEFARGS
or config.MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE and (
opcode == MP_BC_LOAD_NAME
or opcode == MP_BC_LOAD_GLOBAL
or opcode == MP_BC_LOAD_ATTR
or opcode == MP_BC_STORE_ATTR
)
)
ip += 1
if f == MP_OPCODE_VAR_UINT:
while bytecode[ip] & 0x80 != 0:
ip += 1
ip += 1
elif f == MP_OPCODE_OFFSET:
ip += 2
ip += extra_byte
return f, ip - ip_start
def decode_uint(bytecode, ip):
unum = 0
while True:
val = bytecode[ip]
ip += 1
unum = (unum << 7) | (val & 0x7f)
if not (val & 0x80):
break
return ip, unum
def extract_prelude(bytecode):
ip = 0
ip, n_state = decode_uint(bytecode, ip)
ip, n_exc_stack = decode_uint(bytecode, ip)
scope_flags = bytecode[ip]; ip += 1
n_pos_args = bytecode[ip]; ip += 1
n_kwonly_args = bytecode[ip]; ip += 1
n_def_pos_args = bytecode[ip]; ip += 1
ip2, code_info_size = decode_uint(bytecode, ip)
ip += code_info_size
while bytecode[ip] != 0xff:
ip += 1
ip += 1
# ip now points to first opcode
# ip2 points to simple_name qstr
return ip, ip2, (n_state, n_exc_stack, scope_flags, n_pos_args, n_kwonly_args, n_def_pos_args, code_info_size)
class RawCode:
# a set of all escaped names, to make sure they are unique
escaped_names = set()
def __init__(self, bytecode, qstrs, objs, raw_codes):
# set core variables
self.bytecode = bytecode
self.qstrs = qstrs
self.objs = objs
self.raw_codes = raw_codes
# extract prelude
self.ip, self.ip2, self.prelude = extract_prelude(self.bytecode)
self.simple_name = self._unpack_qstr(self.ip2)
self.source_file = self._unpack_qstr(self.ip2 + 2)
def _unpack_qstr(self, ip):
qst = self.bytecode[ip] | self.bytecode[ip + 1] << 8
return global_qstrs[qst]
def dump(self):
# dump children first
for rc in self.raw_codes:
rc.freeze()
# TODO
def freeze(self, parent_name):
self.escaped_name = parent_name + self.simple_name.qstr_esc
# make sure the escaped name is unique
i = 2
while self.escaped_name in RawCode.escaped_names:
self.escaped_name = parent_name + self.simple_name.qstr_esc + str(i)
i += 1
RawCode.escaped_names.add(self.escaped_name)
# emit children first
for rc in self.raw_codes:
rc.freeze(self.escaped_name + '_')
# generate bytecode data
print()
print('// frozen bytecode for file %s, scope %s%s' % (self.source_file.str, parent_name, self.simple_name.str))
print('STATIC ', end='')
if not config.MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE:
print('const ', end='')
print('byte bytecode_data_%s[%u] = {' % (self.escaped_name, len(self.bytecode)))
print(' ', end='')
for i in range(self.ip2):
print(' 0x%02x,' % self.bytecode[i], end='')
print()
print(' ', self.simple_name.qstr_id, '& 0xff,', self.simple_name.qstr_id, '>> 8,')
print(' ', self.source_file.qstr_id, '& 0xff,', self.source_file.qstr_id, '>> 8,')
print(' ', end='')
for i in range(self.ip2 + 4, self.ip):
print(' 0x%02x,' % self.bytecode[i], end='')
print()
ip = self.ip
while ip < len(self.bytecode):
f, sz = mp_opcode_format(self.bytecode, ip)
if f == 1:
qst = self._unpack_qstr(ip + 1).qstr_id
print(' ', '0x%02x,' % self.bytecode[ip], qst, '& 0xff,', qst, '>> 8,')
else:
print(' ', ''.join('0x%02x, ' % self.bytecode[ip + i] for i in range(sz)))
ip += sz
print('};')
# generate constant objects
for i, obj in enumerate(self.objs):
obj_name = 'const_obj_%s_%u' % (self.escaped_name, i)
if is_str_type(obj) or is_bytes_type(obj):
if is_str_type(obj):
obj = bytes_cons(obj, 'utf8')
obj_type = 'mp_type_str'
else:
obj_type = 'mp_type_bytes'
print('STATIC const mp_obj_str_t %s = {{&%s}, %u, %u, (const byte*)"%s"};'
% (obj_name, obj_type, qstrutil.compute_hash(obj, config.MICROPY_QSTR_BYTES_IN_HASH),
len(obj), ''.join(('\\x%02x' % b) for b in obj)))
elif is_int_type(obj):
if config.MICROPY_LONGINT_IMPL == config.MICROPY_LONGINT_IMPL_NONE:
# TODO check if we can actually fit this long-int into a small-int
raise FreezeError(self, 'target does not support long int')
elif config.MICROPY_LONGINT_IMPL == config.MICROPY_LONGINT_IMPL_LONGLONG:
# TODO
raise FreezeError(self, 'freezing int to long-long is not implemented')
elif config.MICROPY_LONGINT_IMPL == config.MICROPY_LONGINT_IMPL_MPZ:
neg = 0
if obj < 0:
obj = -obj
neg = 1
bits_per_dig = config.MPZ_DIG_SIZE
digs = []
z = obj
while z:
digs.append(z & ((1 << bits_per_dig) - 1))
z >>= bits_per_dig
ndigs = len(digs)
digs = ','.join(('%#x' % d) for d in digs)
print('STATIC const mp_obj_int_t %s = {{&mp_type_int}, '
'{.neg=%u, .fixed_dig=1, .alloc=%u, .len=%u, .dig=(uint%u_t[]){%s}}};'
% (obj_name, neg, ndigs, ndigs, bits_per_dig, digs))
elif type(obj) is float:
print('#if MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_A || MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_B')
print('STATIC const mp_obj_float_t %s = {{&mp_type_float}, %.16g};'
% (obj_name, obj))
print('#endif')
elif type(obj) is complex:
print('STATIC const mp_obj_complex_t %s = {{&mp_type_complex}, %.16g, %.16g};'
% (obj_name, obj.real, obj.imag))
else:
# TODO
raise FreezeError(self, 'freezing of object %r is not implemented' % (obj,))
# generate constant table
print('STATIC const mp_uint_t const_table_data_%s[%u] = {'
% (self.escaped_name, len(self.qstrs) + len(self.objs) + len(self.raw_codes)))
for qst in self.qstrs:
print(' (mp_uint_t)MP_OBJ_NEW_QSTR(%s),' % global_qstrs[qst].qstr_id)
for i in range(len(self.objs)):
if type(self.objs[i]) is float:
print('#if MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_A || MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_B')
print(' (mp_uint_t)&const_obj_%s_%u,' % (self.escaped_name, i))
print('#elif MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C')
n = struct.unpack('<I', struct.pack('<f', self.objs[i]))[0]
n = ((n & ~0x3) | 2) + 0x80800000
print(' (mp_uint_t)0x%08x,' % (n,))
print('#else')
print('#error "MICROPY_OBJ_REPR_D not supported with floats in frozen mpy files"')
print('#endif')
else:
print(' (mp_uint_t)&const_obj_%s_%u,' % (self.escaped_name, i))
for rc in self.raw_codes:
print(' (mp_uint_t)&raw_code_%s,' % rc.escaped_name)
print('};')
# generate module
if self.simple_name.str != '<module>':
print('STATIC ', end='')
print('const mp_raw_code_t raw_code_%s = {' % self.escaped_name)
print(' .kind = MP_CODE_BYTECODE,')
print(' .scope_flags = 0x%02x,' % self.prelude[2])
print(' .n_pos_args = %u,' % self.prelude[3])
print(' .data.u_byte = {')
print(' .bytecode = bytecode_data_%s,' % self.escaped_name)
print(' .const_table = const_table_data_%s,' % self.escaped_name)
print(' #if MICROPY_PERSISTENT_CODE_SAVE')
print(' .bc_len = %u,' % len(self.bytecode))
print(' .n_obj = %u,' % len(self.objs))
print(' .n_raw_code = %u,' % len(self.raw_codes))
print(' #endif')
print(' },')
print('};')
def read_uint(f):
i = 0
while True:
b = bytes_cons(f.read(1))[0]
i = (i << 7) | (b & 0x7f)
if b & 0x80 == 0:
break
return i
global_qstrs = []
qstr_type = namedtuple('qstr', ('str', 'qstr_esc', 'qstr_id'))
def read_qstr(f):
ln = read_uint(f)
data = str_cons(f.read(ln), 'utf8')
qstr_esc = qstrutil.qstr_escape(data)
global_qstrs.append(qstr_type(data, qstr_esc, 'MP_QSTR_' + qstr_esc))
return len(global_qstrs) - 1
def read_obj(f):
obj_type = f.read(1)
if obj_type == b'e':
return Ellipsis
else:
buf = f.read(read_uint(f))
if obj_type == b's':
return str_cons(buf, 'utf8')
elif obj_type == b'b':
return bytes_cons(buf)
elif obj_type == b'i':
return int(str_cons(buf, 'ascii'), 10)
elif obj_type == b'f':
return float(str_cons(buf, 'ascii'))
elif obj_type == b'c':
return complex(str_cons(buf, 'ascii'))
else:
assert 0
def read_qstr_and_pack(f, bytecode, ip):
qst = read_qstr(f)
bytecode[ip] = qst & 0xff
bytecode[ip + 1] = qst >> 8
def read_bytecode_qstrs(file, bytecode, ip):
while ip < len(bytecode):
f, sz = mp_opcode_format(bytecode, ip)
if f == 1:
read_qstr_and_pack(file, bytecode, ip + 1)
ip += sz
def read_raw_code(f):
bc_len = read_uint(f)
bytecode = bytearray(f.read(bc_len))
ip, ip2, prelude = extract_prelude(bytecode)
read_qstr_and_pack(f, bytecode, ip2) # simple_name
read_qstr_and_pack(f, bytecode, ip2 + 2) # source_file
read_bytecode_qstrs(f, bytecode, ip)
n_obj = read_uint(f)
n_raw_code = read_uint(f)
qstrs = [read_qstr(f) for _ in range(prelude[3] + prelude[4])]
objs = [read_obj(f) for _ in range(n_obj)]
raw_codes = [read_raw_code(f) for _ in range(n_raw_code)]
return RawCode(bytecode, qstrs, objs, raw_codes)
def read_mpy(filename):
with open(filename, 'rb') as f:
header = bytes_cons(f.read(4))
if header[0] != ord('M'):
raise Exception('not a valid .mpy file')
if header[1] != config.MPY_VERSION:
raise Exception('incompatible .mpy version')
feature_flags = header[2]
config.MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE = (feature_flags & 1) != 0
config.MICROPY_PY_BUILTINS_STR_UNICODE = (feature_flags & 2) != 0
config.mp_small_int_bits = header[3]
return read_raw_code(f)
def dump_mpy(raw_codes):
for rc in raw_codes:
rc.dump()
def freeze_mpy(base_qstrs, raw_codes):
# add to qstrs
new = {}
for q in global_qstrs:
# don't add duplicates
if q.qstr_esc in base_qstrs or q.qstr_esc in new:
continue
new[q.qstr_esc] = (len(new), q.qstr_esc, q.str)
new = sorted(new.values(), key=lambda x: x[0])
print('#include "py/mpconfig.h"')
print('#include "py/objint.h"')
print('#include "py/objstr.h"')
print('#include "py/emitglue.h"')
print()
print('#if MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE != %u' % config.MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE)
print('#error "incompatible MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE"')
print('#endif')
print()
print('#if MICROPY_LONGINT_IMPL != %u' % config.MICROPY_LONGINT_IMPL)
print('#error "incompatible MICROPY_LONGINT_IMPL"')
print('#endif')
print()
if config.MICROPY_LONGINT_IMPL == config.MICROPY_LONGINT_IMPL_MPZ:
print('#if MPZ_DIG_SIZE != %u' % config.MPZ_DIG_SIZE)
print('#error "incompatible MPZ_DIG_SIZE"')
print('#endif')
print()
print('#if MICROPY_PY_BUILTINS_FLOAT')
print('typedef struct _mp_obj_float_t {')
print(' mp_obj_base_t base;')
print(' mp_float_t value;')
print('} mp_obj_float_t;')
print('#endif')
print()
print('#if MICROPY_PY_BUILTINS_COMPLEX')
print('typedef struct _mp_obj_complex_t {')
print(' mp_obj_base_t base;')
print(' mp_float_t real;')
print(' mp_float_t imag;')
print('} mp_obj_complex_t;')
print('#endif')
print()
print('enum {')
for i in range(len(new)):
if i == 0:
print(' MP_QSTR_%s = MP_QSTRnumber_of,' % new[i][1])
else:
print(' MP_QSTR_%s,' % new[i][1])
print('};')
print()
print('extern const qstr_pool_t mp_qstr_const_pool;');
print('const qstr_pool_t mp_qstr_frozen_const_pool = {')
print(' (qstr_pool_t*)&mp_qstr_const_pool, // previous pool')
print(' MP_QSTRnumber_of, // previous pool size')
print(' %u, // allocated entries' % len(new))
print(' %u, // used entries' % len(new))
print(' {')
for _, _, qstr in new:
print(' %s,'
% qstrutil.make_bytes(config.MICROPY_QSTR_BYTES_IN_LEN, config.MICROPY_QSTR_BYTES_IN_HASH, qstr))
print(' },')
print('};')
for rc in raw_codes:
rc.freeze(rc.source_file.str.replace('/', '_')[:-3] + '_')
print()
print('const char mp_frozen_mpy_names[] = {')
for rc in raw_codes:
module_name = rc.source_file.str
print('"%s\\0"' % module_name)
print('"\\0"};')
print('const mp_raw_code_t *const mp_frozen_mpy_content[] = {')
for rc in raw_codes:
print(' &raw_code_%s,' % rc.escaped_name)
print('};')
def main():
import argparse
cmd_parser = argparse.ArgumentParser(description='A tool to work with MicroPython .mpy files.')
cmd_parser.add_argument('-d', '--dump', action='store_true',
help='dump contents of files')
cmd_parser.add_argument('-f', '--freeze', action='store_true',
help='freeze files')
cmd_parser.add_argument('-q', '--qstr-header',
help='qstr header file to freeze against')
cmd_parser.add_argument('-mlongint-impl', choices=['none', 'longlong', 'mpz'], default='mpz',
help='long-int implementation used by target (default mpz)')
cmd_parser.add_argument('-mmpz-dig-size', metavar='N', type=int, default=16,
help='mpz digit size used by target (default 16)')
cmd_parser.add_argument('files', nargs='+',
help='input .mpy files')
args = cmd_parser.parse_args()
# set config values relevant to target machine
config.MICROPY_LONGINT_IMPL = {
'none':config.MICROPY_LONGINT_IMPL_NONE,
'longlong':config.MICROPY_LONGINT_IMPL_LONGLONG,
'mpz':config.MICROPY_LONGINT_IMPL_MPZ,
}[args.mlongint_impl]
config.MPZ_DIG_SIZE = args.mmpz_dig_size
# set config values for qstrs, and get the existing base set of qstrs
if args.qstr_header:
qcfgs, base_qstrs = qstrutil.parse_input_headers([args.qstr_header])
config.MICROPY_QSTR_BYTES_IN_LEN = int(qcfgs['BYTES_IN_LEN'])
config.MICROPY_QSTR_BYTES_IN_HASH = int(qcfgs['BYTES_IN_HASH'])
else:
config.MICROPY_QSTR_BYTES_IN_LEN = 1
config.MICROPY_QSTR_BYTES_IN_HASH = 1
base_qstrs = {}
raw_codes = [read_mpy(file) for file in args.files]
if args.dump:
dump_mpy(raw_codes)
elif args.freeze:
try:
freeze_mpy(base_qstrs, raw_codes)
except FreezeError as er:
print(er, file=sys.stderr)
sys.exit(1)
if __name__ == '__main__':
main()
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