"""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, '__func__'): x = x.__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< 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 = code[i] + 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: op = code[i] 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 = code[i] + 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: op = code[i] i = i+1 if op >= HAVE_ARGUMENT: oparg = code[i] + 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 = list(code.co_lnotab[0::2]) line_increments = list(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 = "" code = compile(source, fn, "exec") dis(code) if __name__ == "__main__": _test() d2'>bug_62f1343ad2 Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.
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