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"""disassembler of Python byte code into mnemonics.
XXX this only works for python-2.3 because of the linenumber
optimization
"""
import sys
from pypy.tool import stdlib_opcode
from pypy.tool.stdlib_opcode import *
__all__ = ["dis","pydisassemble","distb","disco"] + stdlib_opcode.__all__
EXTENDED_ARG = stdlib_opcode.opcodedesc.EXTENDED_ARG.index
class Bytecode:
def __init__(self, disresult, bytecodeindex, oparg, lineno):
self.disresult = disresult
self.index = bytecodeindex
self.op = ord(disresult.code.co_code[self.index])
self.name = opname[self.op]
self.oparg = oparg
self.lineno = lineno
def __eq__(self, other):
return (self.__class__ == other.__class__ and
self.index == other.index and
self.op == other.op and
self.name == other.name and
self.oparg == other.oparg)
def __ne__(self, other):
return not (self == other)
def reprargstring(self, space = None):
""" return a string representation of any arguments. (empty for no args)"""
oparg = self.oparg
if oparg is None:
return ''
co = self.disresult.code
op = self.op
s = repr(oparg).rjust(5) + " "
if op in hasconst:
consts = self.get_consts(space)
s += '(' + consts[oparg] + ')'
elif op in hasname:
s += '(' + co.co_names[oparg] + ')'
elif op in hasjrel:
s += '(to ' + repr(self.index + oparg) + ')'
elif op in haslocal:
s += '(' + co.co_varnames[oparg] + ')'
elif op in hascompare:
s += '(' + cmp_op[oparg] + ')'
elif op in hasfree:
#if free is None:
free = co.co_cellvars + co.co_freevars
s += '(' + free[oparg] + ')'
return s
def get_consts(self, space=None):
# support both real code objects and PyCode objects
co = self.disresult.code
if hasattr(co, "co_consts"):
return [repr(c) for c in co.co_consts]
if space is None:
return [repr(c) for c in co.co_consts_w]
r = lambda x: space.str_w(space.repr(x))
return [r(c) for c in co.co_consts_w]
def repr_with_space(self, space):
return self.name + self.reprargstring(space)
def __repr__(self):
return self.name + self.reprargstring()
class DisResult:
""" an instance of this class gets returned for disassembling
objects/functions/code objects whatever.
"""
def __init__(self, code):
self.code = code
self.bytecodes = []
def append(self, bytecodeindex, oparg, lineno):
""" append bytecode anaylsis information ..."""
bc = Bytecode(self, bytecodeindex, oparg, lineno)
self.bytecodes.append(bc)
def getbytecode(self, index):
""" return bytecode instance matching the given index. """
for bytecode in self.bytecodes:
if bytecode.index == index:
return bytecode
raise ValueError("no bytecode found on index %s in code \n%s" % (
index, pydis(self.code)))
def format(self):
lastlineno = -1
labels = findlabels(self.code.co_code)
lines = []
for bc in self.bytecodes:
l = []
if bc.lineno != lastlineno:
lastlineno = bc.lineno
l.append("%3d" % bc.lineno)
else:
l.append(" ")
l.append(bc.index in labels and ">>" or " ")
l.append(repr(bc.index).rjust(4))
l.append(bc.name.ljust(20))
l.append(bc.reprargstring())
lines.append(" ".join(l))
return "\n".join(lines)
__repr__ = format
def pydis(co):
"""return result of dissassembling a code object. """
if hasattr(co, 'func_code'):
co = co.func_code
if hasattr(co, 'code'):
co = co.code
disresult = DisResult(co)
code = co.co_code
byte_increments = [ord(c) for c in co.co_lnotab[0::2]]
line_increments = [ord(c) for c in co.co_lnotab[1::2]]
table_length = len(byte_increments)
lineno = co.co_firstlineno
table_index = 0
while (table_index < table_length
and byte_increments[table_index] == 0):
lineno += line_increments[table_index]
table_index += 1
addr = 0
line_incr = 0
n = len(code)
i = 0
extended_arg = 0
while i < n:
c = code[i]
op = ord(c)
if i >= addr:
lineno += line_incr
while table_index < table_length:
addr += byte_increments[table_index]
line_incr = line_increments[table_index]
table_index += 1
if line_incr:
break
else:
addr = sys.maxint
current_bytecodeindex = i
i = i+1
oparg = None
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
disresult.append(current_bytecodeindex, oparg, lineno)
assert disresult is not None
return disresult
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
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