mirror of
https://github.com/python/cpython.git
synced 2024-11-30 10:41:14 +01:00
1325790b93
svn+ssh://pythondev@svn.python.org/python/branches/p3yk ........ r55797 | neal.norwitz | 2007-06-07 00:00:57 -0700 (Thu, 07 Jun 2007) | 3 lines Get rid of some remnants of classic classes. types.ClassType == type. Also get rid of almost all uses of the types module and use the builtin name. ........ r55798 | neal.norwitz | 2007-06-07 00:12:36 -0700 (Thu, 07 Jun 2007) | 1 line Remove a use of types, verify commit hook works ........ r55809 | guido.van.rossum | 2007-06-07 11:11:29 -0700 (Thu, 07 Jun 2007) | 2 lines Fix syntax error introduced by Neal in last checkin. ........
274 lines
8.2 KiB
Python
274 lines
8.2 KiB
Python
"""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"] + _opcodes_all
|
|
del _opcodes_all
|
|
|
|
def dis(x=None):
|
|
"""Disassemble classes, methods, functions, or code.
|
|
|
|
With no argument, disassemble the last traceback.
|
|
|
|
"""
|
|
if x is None:
|
|
distb()
|
|
return
|
|
if hasattr(x, 'im_func'):
|
|
x = x.im_func
|
|
if hasattr(x, '__code__'):
|
|
x = x.__code__
|
|
if hasattr(x, '__dict__'):
|
|
items = sorted(x.__dict__.items())
|
|
for name, x1 in items:
|
|
if isinstance(x1, (types.MethodType, types.FunctionType,
|
|
types.CodeType, type)):
|
|
print("Disassembly of %s:" % name)
|
|
try:
|
|
dis(x1)
|
|
except TypeError as msg:
|
|
print("Sorry:", msg)
|
|
print()
|
|
elif 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)
|
|
|
|
# XXX This duplicates information from code.h, also duplicated in inspect.py.
|
|
# XXX Maybe this ought to be put in a central location, like opcode.py?
|
|
flag2name = {
|
|
1: "OPTIMIZED",
|
|
2: "NEWLOCALS",
|
|
4: "VARARGS",
|
|
8: "VARKEYWORDS",
|
|
16: "NESTED",
|
|
32: "GENERATOR",
|
|
64: "NOFREE",
|
|
}
|
|
|
|
def pretty_flags(flags):
|
|
"""Return pretty representation of code flags."""
|
|
names = []
|
|
for i in range(32):
|
|
flag = 1<<i
|
|
if flags & flag:
|
|
names.append(flag2name.get(flag, hex(flag)))
|
|
flags ^= flag
|
|
if not flags:
|
|
break
|
|
else:
|
|
names.append(hex(flags))
|
|
return ", ".join(names)
|
|
|
|
def show_code(co):
|
|
"""Show details about a code object."""
|
|
print("Name: ", co.co_name)
|
|
print("Filename: ", co.co_filename)
|
|
print("Argument count: ", co.co_argcount)
|
|
print("Kw-only arguments:", co.co_kwonlyargcount)
|
|
print("Number of locals: ", co.co_nlocals)
|
|
print("Stack size: ", co.co_stacksize)
|
|
print("Flags: ", pretty_flags(co.co_flags))
|
|
if co.co_consts:
|
|
print("Constants:")
|
|
for i_c in enumerate(co.co_consts):
|
|
print("%4d: %r" % i_c)
|
|
if co.co_names:
|
|
print("Names:")
|
|
for i_n in enumerate(co.co_names):
|
|
print("%4d: %s" % i_n)
|
|
if co.co_varnames:
|
|
print("Variable names:")
|
|
for i_n in enumerate(co.co_varnames):
|
|
print("%4d: %s" % i_n)
|
|
if co.co_freevars:
|
|
print("Free variables:")
|
|
for i_n in enumerate(co.co_freevars):
|
|
print("%4d: %s" % i_n)
|
|
if co.co_cellvars:
|
|
print("Cell variables:")
|
|
for i_n in enumerate(co.co_cellvars):
|
|
print("%4d: %s" % i_n)
|
|
|
|
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], end=' ')
|
|
else:
|
|
print(' ', end=' ')
|
|
|
|
if i == lasti: print('-->', end=' ')
|
|
else: print(' ', end=' ')
|
|
if i in labels: print('>>', end=' ')
|
|
else: print(' ', end=' ')
|
|
print(repr(i).rjust(4), end=' ')
|
|
print(opname[op].ljust(20), end=' ')
|
|
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*65536
|
|
print(repr(oparg).rjust(5), end=' ')
|
|
if op in hasconst:
|
|
print('(' + repr(co.co_consts[oparg]) + ')', end=' ')
|
|
elif op in hasname:
|
|
print('(' + co.co_names[oparg] + ')', end=' ')
|
|
elif op in hasjrel:
|
|
print('(to ' + repr(i + oparg) + ')', end=' ')
|
|
elif op in haslocal:
|
|
print('(' + co.co_varnames[oparg] + ')', end=' ')
|
|
elif op in hascompare:
|
|
print('(' + cmp_op[oparg] + ')', end=' ')
|
|
elif op in hasfree:
|
|
if free is None:
|
|
free = co.co_cellvars + co.co_freevars
|
|
print('(' + free[oparg] + ')', end=' ')
|
|
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('-->', end=' ')
|
|
else: print(' ', end=' ')
|
|
if i in labels: print('>>', end=' ')
|
|
else: print(' ', end=' ')
|
|
print(repr(i).rjust(4), end=' ')
|
|
print(opname[op].ljust(15), end=' ')
|
|
i = i+1
|
|
if op >= HAVE_ARGUMENT:
|
|
oparg = ord(code[i]) + ord(code[i+1])*256
|
|
i = i+2
|
|
print(repr(oparg).rjust(5), end=' ')
|
|
if op in hasconst:
|
|
if constants:
|
|
print('(' + repr(constants[oparg]) + ')', end=' ')
|
|
else:
|
|
print('(%d)'%oparg, end=' ')
|
|
elif op in hasname:
|
|
if names is not None:
|
|
print('(' + names[oparg] + ')', end=' ')
|
|
else:
|
|
print('(%d)'%oparg, end=' ')
|
|
elif op in hasjrel:
|
|
print('(to ' + repr(i + oparg) + ')', end=' ')
|
|
elif op in haslocal:
|
|
if varnames:
|
|
print('(' + varnames[oparg] + ')', end=' ')
|
|
else:
|
|
print('(%d)' % oparg, end=' ')
|
|
elif op in hascompare:
|
|
print('(' + cmp_op[oparg] + ')', end=' ')
|
|
print()
|
|
|
|
disco = disassemble # XXX For backwards compatibility
|
|
|
|
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()
|