| """Disassembler of Python byte code into mnemonics.""" |
| |
| import sys |
| import types |
| |
| __all__ = ["dis","disassemble","distb","disco","opname","cmp_op", |
| "hasconst","hasname","hasjrel","hasjabs","haslocal", |
| "hascompare", "hasfree"] |
| |
| def dis(x=None): |
| """Disassemble classes, methods, functions, or code. |
| |
| With no argument, disassemble the last traceback. |
| |
| """ |
| if not x: |
| distb() |
| return |
| if type(x) is 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 type(x1) in (types.MethodType, |
| types.FunctionType, |
| types.CodeType): |
| print "Disassembly of %s:" % name |
| try: |
| dis(x1) |
| except TypeError, msg: |
| print "Sorry:", msg |
| print |
| elif hasattr(x, 'co_code'): |
| disassemble(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 not tb: |
| 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) |
| n = len(code) |
| i = 0 |
| extended_arg = 0 |
| free = None |
| while i < n: |
| c = code[i] |
| op = ord(c) |
| if op == SET_LINENO and i > 0: print # Extra blank line |
| if i == lasti: print '-->', |
| else: print ' ', |
| if i in labels: print '>>', |
| else: print ' ', |
| print `i`.rjust(4), |
| print 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*65536L |
| print `oparg`.rjust(5), |
| if op in hasconst: |
| print '(' + `co.co_consts[oparg]` + ')', |
| elif op in hasname: |
| print '(' + co.co_names[oparg] + ')', |
| elif op in hasjrel: |
| print '(to ' + `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 |
| |
| 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 |
| |
| cmp_op = ('<', '<=', '==', '!=', '>', '>=', 'in', 'not in', 'is', |
| 'is not', 'exception match', 'BAD') |
| |
| hasconst = [] |
| hasname = [] |
| hasjrel = [] |
| hasjabs = [] |
| haslocal = [] |
| hascompare = [] |
| hasfree = [] |
| |
| opname = [''] * 256 |
| for op in range(256): opname[op] = '<' + `op` + '>' |
| del op |
| |
| def def_op(name, op): |
| opname[op] = name |
| |
| def name_op(name, op): |
| opname[op] = name |
| hasname.append(op) |
| |
| def jrel_op(name, op): |
| opname[op] = name |
| hasjrel.append(op) |
| |
| def jabs_op(name, op): |
| opname[op] = name |
| hasjabs.append(op) |
| |
| # Instruction opcodes for compiled code |
| |
| def_op('STOP_CODE', 0) |
| def_op('POP_TOP', 1) |
| def_op('ROT_TWO', 2) |
| def_op('ROT_THREE', 3) |
| def_op('DUP_TOP', 4) |
| def_op('ROT_FOUR', 5) |
| |
| def_op('UNARY_POSITIVE', 10) |
| def_op('UNARY_NEGATIVE', 11) |
| def_op('UNARY_NOT', 12) |
| def_op('UNARY_CONVERT', 13) |
| |
| def_op('UNARY_INVERT', 15) |
| |
| def_op('BINARY_POWER', 19) |
| |
| def_op('BINARY_MULTIPLY', 20) |
| def_op('BINARY_DIVIDE', 21) |
| def_op('BINARY_MODULO', 22) |
| def_op('BINARY_ADD', 23) |
| def_op('BINARY_SUBTRACT', 24) |
| def_op('BINARY_SUBSCR', 25) |
| def_op('BINARY_FLOOR_DIVIDE', 26) |
| def_op('BINARY_TRUE_DIVIDE', 27) |
| def_op('INPLACE_FLOOR_DIVIDE', 28) |
| def_op('INPLACE_TRUE_DIVIDE', 29) |
| |
| def_op('SLICE+0', 30) |
| def_op('SLICE+1', 31) |
| def_op('SLICE+2', 32) |
| def_op('SLICE+3', 33) |
| |
| def_op('STORE_SLICE+0', 40) |
| def_op('STORE_SLICE+1', 41) |
| def_op('STORE_SLICE+2', 42) |
| def_op('STORE_SLICE+3', 43) |
| |
| def_op('DELETE_SLICE+0', 50) |
| def_op('DELETE_SLICE+1', 51) |
| def_op('DELETE_SLICE+2', 52) |
| def_op('DELETE_SLICE+3', 53) |
| |
| def_op('INPLACE_ADD', 55) |
| def_op('INPLACE_SUBTRACT', 56) |
| def_op('INPLACE_MULTIPLY', 57) |
| def_op('INPLACE_DIVIDE', 58) |
| def_op('INPLACE_MODULO', 59) |
| def_op('STORE_SUBSCR', 60) |
| def_op('DELETE_SUBSCR', 61) |
| |
| def_op('BINARY_LSHIFT', 62) |
| def_op('BINARY_RSHIFT', 63) |
| def_op('BINARY_AND', 64) |
| def_op('BINARY_XOR', 65) |
| def_op('BINARY_OR', 66) |
| def_op('INPLACE_POWER', 67) |
| def_op('GET_ITER', 68) |
| |
| def_op('PRINT_EXPR', 70) |
| def_op('PRINT_ITEM', 71) |
| def_op('PRINT_NEWLINE', 72) |
| def_op('PRINT_ITEM_TO', 73) |
| def_op('PRINT_NEWLINE_TO', 74) |
| def_op('INPLACE_LSHIFT', 75) |
| def_op('INPLACE_RSHIFT', 76) |
| def_op('INPLACE_AND', 77) |
| def_op('INPLACE_XOR', 78) |
| def_op('INPLACE_OR', 79) |
| def_op('BREAK_LOOP', 80) |
| |
| def_op('LOAD_LOCALS', 82) |
| def_op('RETURN_VALUE', 83) |
| def_op('IMPORT_STAR', 84) |
| def_op('EXEC_STMT', 85) |
| def_op('YIELD_STMT', 86) |
| |
| def_op('POP_BLOCK', 87) |
| def_op('END_FINALLY', 88) |
| def_op('BUILD_CLASS', 89) |
| |
| HAVE_ARGUMENT = 90 # Opcodes from here have an argument: |
| |
| name_op('STORE_NAME', 90) # Index in name list |
| name_op('DELETE_NAME', 91) # "" |
| def_op('UNPACK_SEQUENCE', 92) # Number of tuple items |
| jrel_op('FOR_ITER', 93) |
| |
| name_op('STORE_ATTR', 95) # Index in name list |
| name_op('DELETE_ATTR', 96) # "" |
| name_op('STORE_GLOBAL', 97) # "" |
| name_op('DELETE_GLOBAL', 98) # "" |
| def_op('DUP_TOPX', 99) # number of items to duplicate |
| def_op('LOAD_CONST', 100) # Index in const list |
| hasconst.append(100) |
| name_op('LOAD_NAME', 101) # Index in name list |
| def_op('BUILD_TUPLE', 102) # Number of tuple items |
| def_op('BUILD_LIST', 103) # Number of list items |
| def_op('BUILD_MAP', 104) # Always zero for now |
| name_op('LOAD_ATTR', 105) # Index in name list |
| def_op('COMPARE_OP', 106) # Comparison operator |
| hascompare.append(106) |
| name_op('IMPORT_NAME', 107) # Index in name list |
| name_op('IMPORT_FROM', 108) # Index in name list |
| |
| jrel_op('JUMP_FORWARD', 110) # Number of bytes to skip |
| jrel_op('JUMP_IF_FALSE', 111) # "" |
| jrel_op('JUMP_IF_TRUE', 112) # "" |
| jabs_op('JUMP_ABSOLUTE', 113) # Target byte offset from beginning of code |
| jrel_op('FOR_LOOP', 114) # Number of bytes to skip |
| |
| name_op('LOAD_GLOBAL', 116) # Index in name list |
| |
| jabs_op('CONTINUE_LOOP', 119) # Target address |
| jrel_op('SETUP_LOOP', 120) # Distance to target address |
| jrel_op('SETUP_EXCEPT', 121) # "" |
| jrel_op('SETUP_FINALLY', 122) # "" |
| |
| def_op('LOAD_FAST', 124) # Local variable number |
| haslocal.append(124) |
| def_op('STORE_FAST', 125) # Local variable number |
| haslocal.append(125) |
| def_op('DELETE_FAST', 126) # Local variable number |
| haslocal.append(126) |
| |
| def_op('SET_LINENO', 127) # Current line number |
| SET_LINENO = 127 |
| |
| def_op('RAISE_VARARGS', 130) # Number of raise arguments (1, 2, or 3) |
| def_op('CALL_FUNCTION', 131) # #args + (#kwargs << 8) |
| def_op('MAKE_FUNCTION', 132) # Number of args with default values |
| def_op('BUILD_SLICE', 133) # Number of items |
| |
| def_op('MAKE_CLOSURE', 134) |
| def_op('LOAD_CLOSURE', 135) |
| hasfree.append(135) |
| def_op('LOAD_DEREF', 136) |
| hasfree.append(136) |
| def_op('STORE_DEREF', 137) |
| hasfree.append(137) |
| |
| def_op('CALL_FUNCTION_VAR', 140) # #args + (#kwargs << 8) |
| def_op('CALL_FUNCTION_KW', 141) # #args + (#kwargs << 8) |
| def_op('CALL_FUNCTION_VAR_KW', 142) # #args + (#kwargs << 8) |
| |
| def_op('EXTENDED_ARG', 143) |
| EXTENDED_ARG = 143 |
| |
| 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 not fn: |
| f = sys.stdin |
| else: |
| f = open(fn) |
| source = f.read() |
| if fn: |
| f.close() |
| else: |
| fn = "<stdin>" |
| code = compile(source, fn, "exec") |
| dis(code) |
| |
| if __name__ == "__main__": |
| _test() |