mirror of
https://github.com/python/cpython.git
synced 2025-11-04 11:49:12 +00:00
59d1d2b434
new slot tp_iter in type object, plus new flag Py_TPFLAGS_HAVE_ITER new C API PyObject_GetIter(), calls tp_iter new builtin iter(), with two forms: iter(obj), and iter(function, sentinel) new internal object types iterobject and calliterobject new exception StopIteration new opcodes for "for" loops, GET_ITER and FOR_ITER (also supported by dis.py) new magic number for .pyc files new special method for instances: __iter__() returns an iterator iteration over dictionaries: "for x in dict" iterates over the keys iteration over files: "for x in file" iterates over lines TODO: documentation test suite decide whether to use a different way to spell iter(function, sentinal) decide whether "for key in dict" is a good idea use iterators in map/filter/reduce, min/max, and elsewhere (in/not in?) speed tuning (make next() a slot tp_next???)
322 lines
8.7 KiB
Python
322 lines
8.7 KiB
Python
"""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` + '>'
|
|
|
|
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('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('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
|
|
def_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()
|