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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""
Dump the contents of a .pyc file.
The output will only be correct if run with the same version of Python that
produced the .pyc.
"""
import binascii
import dis
import marshal
import struct
import sys
import time
import types
def show_pyc_file(fname):
f = open(fname, "rb")
magic = f.read(4)
print("magic %s" % (binascii.hexlify(magic)))
read_date_and_size = True
if sys.version_info >= (3, 7):
# 3.7 added a flags word
flags = struct.unpack('<L', f.read(4))[0]
hash_based = bool(flags & 0x01)
check_source = bool(flags & 0x02)
print(f"flags 0x{flags:08x}")
if hash_based:
source_hash = f.read(8)
read_date_and_size = False
print(f"hash {binascii.hexlify(source_hash)}")
print(f"check_source {check_source}")
if read_date_and_size:
moddate = f.read(4)
modtime = time.asctime(time.localtime(struct.unpack('<L', moddate)[0]))
print(f"moddate {binascii.hexlify(moddate)} ({modtime})")
size = f.read(4)
print("pysize %s (%d)" % (binascii.hexlify(size), struct.unpack('<L', size)[0]))
code = marshal.load(f)
show_code(code)
def show_py_file(fname):
text = open(fname).read().replace('\r\n', '\n')
show_py_text(text, fname=fname)
def show_py_text(text, fname="<string>"):
code = compile(text, fname, "exec")
show_code(code)
CO_FLAGS = [
('CO_OPTIMIZED', 0x00001),
('CO_NEWLOCALS', 0x00002),
('CO_VARARGS', 0x00004),
('CO_VARKEYWORDS', 0x00008),
('CO_NESTED', 0x00010),
('CO_GENERATOR', 0x00020),
('CO_NOFREE', 0x00040),
('CO_COROUTINE', 0x00080),
('CO_ITERABLE_COROUTINE', 0x00100),
('CO_ASYNC_GENERATOR', 0x00200),
('CO_GENERATOR_ALLOWED', 0x01000),
]
if sys.version_info < (3, 9):
CO_FLAGS += [
('CO_FUTURE_DIVISION', 0x02000),
('CO_FUTURE_ABSOLUTE_IMPORT', 0x04000),
('CO_FUTURE_WITH_STATEMENT', 0x08000),
('CO_FUTURE_PRINT_FUNCTION', 0x10000),
('CO_FUTURE_UNICODE_LITERALS', 0x20000),
('CO_FUTURE_BARRY_AS_BDFL', 0x40000),
('CO_FUTURE_GENERATOR_STOP', 0x80000),
]
else:
CO_FLAGS += [
('CO_FUTURE_DIVISION', 0x0020000),
('CO_FUTURE_ABSOLUTE_IMPORT', 0x0040000),
('CO_FUTURE_WITH_STATEMENT', 0x0080000),
('CO_FUTURE_PRINT_FUNCTION', 0x0100000),
('CO_FUTURE_UNICODE_LITERALS', 0x0200000),
('CO_FUTURE_BARRY_AS_BDFL', 0x0400000),
('CO_FUTURE_GENERATOR_STOP', 0x0800000),
('CO_FUTURE_ANNOTATIONS', 0x1000000),
]
def show_code(code, indent='', number=None):
label = ""
if number is not None:
label = "%d: " % number
print(f"{indent}{label}code")
indent += " "
print(f"{indent}name {code.co_name!r}")
print("%sargcount %d" % (indent, code.co_argcount))
print("%snlocals %d" % (indent, code.co_nlocals))
print("%sstacksize %d" % (indent, code.co_stacksize))
print(f"{indent}flags {code.co_flags:04x}: {flag_words(code.co_flags, CO_FLAGS)}")
show_hex("code", code.co_code, indent=indent)
dis.disassemble(code)
print("%sconsts" % indent)
for i, const in enumerate(code.co_consts):
if type(const) == types.CodeType:
show_code(const, indent+" ", number=i)
else:
print(" %s%d: %r" % (indent, i, const))
print(f"{indent}names {code.co_names!r}")
print(f"{indent}varnames {code.co_varnames!r}")
print(f"{indent}freevars {code.co_freevars!r}")
print(f"{indent}cellvars {code.co_cellvars!r}")
print(f"{indent}filename {code.co_filename!r}")
print("%sfirstlineno %d" % (indent, code.co_firstlineno))
show_hex("lnotab", code.co_lnotab, indent=indent)
print(" {}{}".format(indent, ", ".join(f"{line!r}:{byte!r}" for byte, line in lnotab_interpreted(code))))
if hasattr(code, "co_linetable"):
show_hex("linetable", code.co_linetable, indent=indent)
if hasattr(code, "co_lines"):
print(" {}co_lines {}".format(
indent,
", ".join(f"{line!r}:{start!r}-{end!r}" for start, end, line in code.co_lines())
))
def show_hex(label, h, indent):
h = binascii.hexlify(h)
if len(h) < 60:
print("{}{} {}".format(indent, label, h.decode('ascii')))
else:
print(f"{indent}{label}")
for i in range(0, len(h), 60):
print("{} {}".format(indent, h[i:i+60].decode('ascii')))
def lnotab_interpreted(code):
# Adapted from dis.py in the standard library.
byte_increments = code.co_lnotab[0::2]
line_increments = code.co_lnotab[1::2]
last_line_num = None
line_num = code.co_firstlineno
byte_num = 0
for byte_incr, line_incr in zip(byte_increments, line_increments):
if byte_incr:
if line_num != last_line_num:
yield (byte_num, line_num)
last_line_num = line_num
byte_num += byte_incr
if sys.version_info >= (3, 6) and line_incr >= 0x80:
line_incr -= 0x100
line_num += line_incr
if line_num != last_line_num:
yield (byte_num, line_num)
def flag_words(flags, flag_defs):
words = []
for word, flag in flag_defs:
if flag & flags:
words.append(word)
return ", ".join(words)
def show_file(fname):
if fname.endswith('pyc'):
show_pyc_file(fname)
elif fname.endswith('py'):
show_py_file(fname)
else:
print("Odd file:", fname)
def main(args):
if args[0] == '-c':
show_py_text(" ".join(args[1:]).replace(";", "\n"))
else:
for a in args:
show_file(a)
if __name__ == '__main__':
main(sys.argv[1:])
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