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dis.pyc
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Python Compiled Bytecode
|
2014-12-31
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6KB
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247 lines
# Source Generated with Decompyle++
# File: in.pyc (Python 2.7)
'''Disassembler of Python byte code into mnemonics.'''
import sys
import types
from opcode import *
from opcode import __all__ as _opcodes_all
__all__ = [
'dis',
'disassemble',
'distb',
'disco',
'findlinestarts',
'findlabels'] + _opcodes_all
del _opcodes_all
_have_code = (types.MethodType, types.FunctionType, types.CodeType, types.ClassType, type)
def dis(x = None):
'''Disassemble classes, methods, functions, or code.
With no argument, disassemble the last traceback.
'''
if x is None:
distb()
return None
if None(x, types.InstanceType):
x = x.__class__
if hasattr(x, 'im_func'):
x = x.im_func
if hasattr(x, 'func_code'):
x = x.func_code
if hasattr(x, '__dict__'):
items = x.__dict__.items()
items.sort()
for name, x1 in items:
if isinstance(x1, _have_code):
print 'Disassembly of %s:' % name
try:
dis(x1)
except TypeError:
msg = None
print 'Sorry:', msg
print
continue
if hasattr(x, 'co_code'):
disassemble(x)
elif isinstance(x, str):
disassemble_string(x)
else:
raise TypeError, "don't know how to disassemble %s objects" % type(x).__name__
def distb(tb = None):
'''Disassemble a traceback (default: last traceback).'''
if tb is None:
try:
tb = sys.last_traceback
except AttributeError:
raise RuntimeError, 'no last traceback to disassemble'
while tb.tb_next:
tb = tb.tb_next
disassemble(tb.tb_frame.f_code, tb.tb_lasti)
def disassemble(co, lasti = -1):
'''Disassemble a code object.'''
code = co.co_code
labels = findlabels(code)
linestarts = dict(findlinestarts(co))
n = len(code)
i = 0
extended_arg = 0
free = None
while i < n:
c = code[i]
op = ord(c)
if i in linestarts:
if i > 0:
print
print '%3d' % linestarts[i],
else:
print ' ',
if i == lasti:
print '-->',
else:
print ' ',
if i in labels:
print '>>',
else:
print ' ',
print repr(i).rjust(4), opname[op].ljust(20),
i = i + 1
if op >= HAVE_ARGUMENT:
oparg = ord(code[i]) + ord(code[i + 1]) * 256 + extended_arg
extended_arg = 0
i = i + 2
if op == EXTENDED_ARG:
extended_arg = oparg * 0x10000L
print repr(oparg).rjust(5),
if op in hasconst:
print '(' + repr(co.co_consts[oparg]) + ')',
elif op in hasname:
print '(' + co.co_names[oparg] + ')',
elif op in hasjrel:
print '(to ' + repr(i + oparg) + ')',
elif op in haslocal:
print '(' + co.co_varnames[oparg] + ')',
elif op in hascompare:
print '(' + cmp_op[oparg] + ')',
elif op in hasfree:
if free is None:
free = co.co_cellvars + co.co_freevars
print '(' + free[oparg] + ')',
print
def disassemble_string(code, lasti = -1, varnames = None, names = None, constants = None):
labels = findlabels(code)
n = len(code)
i = 0
while i < n:
c = code[i]
op = ord(c)
if i == lasti:
print '-->',
else:
print ' ',
if i in labels:
print '>>',
else:
print ' ',
print repr(i).rjust(4), opname[op].ljust(15),
i = i + 1
if op >= HAVE_ARGUMENT:
oparg = ord(code[i]) + ord(code[i + 1]) * 256
i = i + 2
print repr(oparg).rjust(5),
if op in hasconst:
if constants:
print '(' + repr(constants[oparg]) + ')',
else:
print '(%d)' % oparg,
elif op in hasname:
if names is not None:
print '(' + names[oparg] + ')',
else:
print '(%d)' % oparg,
elif op in hasjrel:
print '(to ' + repr(i + oparg) + ')',
elif op in haslocal:
if varnames:
print '(' + varnames[oparg] + ')',
else:
print '(%d)' % oparg,
elif op in hascompare:
print '(' + cmp_op[oparg] + ')',
print
disco = disassemble
def findlabels(code):
'''Detect all offsets in a byte code which are jump targets.
Return the list of offsets.
'''
labels = []
n = len(code)
i = 0
while i < n:
c = code[i]
op = ord(c)
i = i + 1
if op >= HAVE_ARGUMENT:
oparg = ord(code[i]) + ord(code[i + 1]) * 256
i = i + 2
label = -1
if op in hasjrel:
label = i + oparg
elif op in hasjabs:
label = oparg
if label >= 0:
if label not in labels:
labels.append(label)
return labels
def findlinestarts(code):
'''Find the offsets in a byte code which are start of lines in the source.
Generate pairs (offset, lineno) as described in Python/compile.c.
'''
byte_increments = [ ord(c) for c in code.co_lnotab[0::2] ]
line_increments = [ ord(c) for c in code.co_lnotab[1::2] ]
lastlineno = None
lineno = code.co_firstlineno
addr = 0
for byte_incr, line_incr in zip(byte_increments, line_increments):
if byte_incr:
if lineno != lastlineno:
yield (addr, lineno)
lastlineno = lineno
addr += byte_incr
lineno += line_incr
if lineno != lastlineno:
yield (addr, lineno)
def _test():
'''Simple test program to disassemble a file.'''
if sys.argv[1:]:
if sys.argv[2:]:
sys.stderr.write('usage: python dis.py [-|file]\n')
sys.exit(2)
fn = sys.argv[1]
if not fn or fn == '-':
fn = None
else:
fn = None
if fn is None:
f = sys.stdin
else:
f = open(fn)
source = f.read()
if fn is not None:
f.close()
else:
fn = '<stdin>'
code = compile(source, fn, 'exec')
dis(code)
if __name__ == '__main__':
_test()