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CWE-ou-minkata/Scripts/ServerPython/python/system/decompyle.py

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# Copyright (c) 1999 John Aycock
# Copyright (c) 2000 by hartmut Goebel <hartmut@goebel.noris.de>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# See 'CHANGES' for a list of changes
#
# NB. This is not a masterpiece of software, but became more like a hack.
# Probably a complete write would be sensefull. hG/2000-12-27
#
import re, sys, os, types
import dis, imp, marshal
import string
import cStringIO
def _load_file(filename):
"""
load a Python source file and compile it to byte-code
_load_module(filename: string): code_object
filename: name of file containing Python source code
(normally a .py)
code_object: code_object compiled from this source code
This function does NOT write any file!
"""
fp = open(filename, 'rb')
source = fp.read()+'\n'
try:
co = compile(source, filename, 'exec')
except SyntaxError:
sys.stderr.writelines( ['>>Syntax error in ', filename, '\n'] )
raise
fp.close()
return co
def _load_module(filename):
"""
load a module without importing it
_load_module(filename: string): code_object
filename: name of file containing Python byte-code object
(normally a .pyc)
code_object: code_object from this file
"""
fp = open(filename, 'rb')
if fp.read(4) != imp.get_magic():
raise ImportError, "Bad magic number in %s" % filename
fp.read(4)
co = marshal.load(fp)
fp.close()
return co
#-- start of (de-)compiler
#
# Scanning
#
class Code:
"""Class for representing code-objects.
This is similar to the original code object, but additionally
the diassembled code is stored in the attribute '_tokens'.
"""
def __init__(self, co):
for i in dir(co):
exec 'self.%s = co.%s' % (i, i)
self._tokens, self._customize = disassemble(co)
class Token:
"""Class representing a byte-code token.
A byte-code token is equivalent to the contents of one line
as output by dis.dis().
"""
def __init__(self, type, attr=None, pattr=None, offset=-1):
self.type = intern(type)
self.attr = attr
self.pattr = pattr
self.offset = offset
def __cmp__(self, o):
if isinstance(o, Token):
# both are tokens: compare type and pattr
return cmp(self.type, o.type) \
or cmp(self.pattr, o.pattr)
else:
return cmp(self.type, o)
def __repr__(self): return str(self.type)
def __str__(self):
if self.pattr: pattr = self.pattr
else: pattr = ''
return '%s\t%-17s %s' % (self.offset, self.type, pattr)
def __hash__(self): return hash(self.type)
def __getitem__(self, i): raise IndexError
_JUMP_OPS_ = map(lambda op: dis.opname[op], dis.hasjrel + dis.hasjabs)
def disassemble(co):
"""Disassemble a code object, returning a list of Token.
The main part of this procedure is modelled after
dis.diaassemble().
"""
rv = []
customize = {}
code = co.co_code
cf = find_jump_targets(code)
n = len(code)
i = 0
while i < n:
offset = i
if cf.has_key(offset):
for j in range(cf[offset]):
rv.append(Token('COME_FROM',
offset="%s_%d" % (offset, j) ))
c = code[i]
op = ord(c)
opname = dis.opname[op]
i = i+1
oparg = None; pattr = None
if op >= dis.HAVE_ARGUMENT:
oparg = ord(code[i]) + ord(code[i+1])*256
i = i+2
if op in dis.hasconst:
const = co.co_consts[oparg]
if type(const) == types.CodeType:
oparg = const
if const.co_name == '<lambda>':
assert opname == 'LOAD_CONST'
opname = 'LOAD_LAMBDA'
# verify uses 'pattr' for
# comparism, since 'attr' now
# hold Code(const) and thus
# can not be used for
# comparism (todo: thinkg
# about changing this)
#pattr = 'code_object @ 0x%x %s->%s' %\
# (id(const), const.co_filename, const.co_name)
pattr = 'code_object ' + const.co_name
else:
pattr = `const`
elif op in dis.hasname:
pattr = co.co_names[oparg]
elif op in dis.hasjrel:
pattr = `i + oparg`
elif op in dis.haslocal:
pattr = co.co_varnames[oparg]
elif op in dis.hascompare:
pattr = dis.cmp_op[oparg]
if opname == 'SET_LINENO':
continue
elif opname in ('BUILD_LIST', 'BUILD_TUPLE', 'BUILD_SLICE',
'UNPACK_LIST', 'UNPACK_TUPLE',
'UNPACK_SEQUENCE',
'MAKE_FUNCTION', 'CALL_FUNCTION',
'CALL_FUNCTION_VAR', 'CALL_FUNCTION_KW',
'CALL_FUNCTION_VAR_KW', 'DUP_TOPX',
):
opname = '%s_%d' % (opname, oparg)
customize[opname] = oparg
rv.append(Token(opname, oparg, pattr, offset))
return rv, customize
def find_jump_targets(code):
"""Detect all offsets in a byte code which are jump targets.
Return the list of offsets.
This procedure is modelled after dis.findlables(), but here
for each target the number of jumps are counted.
"""
targets = {}
n = len(code)
i = 0
while i < n:
c = code[i]
op = ord(c)
i = i+1
if op >= dis.HAVE_ARGUMENT:
oparg = ord(code[i]) + ord(code[i+1])*256
i = i+2
label = -1
if op in dis.hasjrel:
label = i+oparg
# todo: absolut jumps
#elif op in dis.hasjabs:
# label = oparg
if label >= 0:
targets[label] = targets.get(label, 0) + 1
return targets
#
# Parsing
#
class AST:
def __init__(self, type, kids=None):
self.type = intern(type)
if kids == None: kids = []
self._kids = kids
def append(self, o): self._kids.append(o)
def pop(self): return self._kids.pop()
def __getitem__(self, i): return self._kids[i]
def __setitem__(self, i, val): self._kids[i] = val
def __delitem__(self, i): del self._kids[i]
def __len__(self): return len(self._kids)
def __getslice__(self, low, high): return self._kids[low:high]
def __setslice__(self, low, high, seq): self._kids[low:high] = seq
def __delslice__(self, low, high): del self._kids[low:high]
def __cmp__(self, o):
if isinstance(o, AST):
return cmp(self.type, o.type) \
or cmp(self._kids, o._kids)
else:
return cmp(self.type, o)
def __hash__(self): return hash(self.type)
def __repr__(self):
rv = str(self.type)
for k in self._kids:
rv = rv + '\n' + string.replace(str(k), '\n', '\n ')
return rv
# Some ASTs used for comparing code fragments (like 'return None' at
# the end of functions).
RETURN_LOCALS = AST('stmt',
[ AST('return_stmt',
[ AST('expr', [ Token('LOAD_LOCALS') ]),
Token('RETURN_VALUE')]) ])
RETURN_NONE = AST('stmt',
[ AST('return_stmt',
[ AST('expr', [ Token('LOAD_CONST', pattr='None') ]),
Token('RETURN_VALUE')]) ])
ASSIGN_DOC_STRING = lambda doc_string: \
AST('stmt',
[ AST('assign',
[ AST('expr', [ Token('LOAD_CONST', pattr=`doc_string`) ]),
AST('designator', [ Token('STORE_NAME', pattr='__doc__')])
])])
BUILD_TUPLE_0 = AST('expr',
[ Token('BUILD_TUPLE_0') ] )
from spark import GenericASTBuilder, GenericASTMatcher
class Parser(GenericASTBuilder):
def __init__(self):
GenericASTBuilder.__init__(self, AST, 'code')
self.customized = {}
def cleanup(self):
"""
Remove recursive references to allow garbage
collector to collect this object.
"""
for dict in (self.rule2func, self.rules, self.rule2name, self.first):
for i in dict.keys():
dict[i] = None
for i in dir(self):
setattr(self, i, None)
def error(self, token):
# output offset, too
print "Syntax error at or near `%s' token at offset %s" % \
(`token`, token.offset)
raise SystemExit
def typestring(self, token):
return token.type
def p_funcdef(self, args):
'''
stmt ::= funcdef
funcdef ::= mkfunc STORE_FAST
funcdef ::= mkfunc STORE_NAME
'''
# new for Python2.0
#
# UNPACK_SEQUENCE # number of tuple items
# EXTENDED_ARG
def p_list_comprehension(self, args):
'''
expr ::= list_compr
list_compr ::= lc_prep lc_for lc_cleanup
lc_prep ::= BUILD_LIST_0 DUP_TOP LOAD_ATTR STORE_NAME
lc_prep ::= BUILD_LIST_0 DUP_TOP LOAD_ATTR STORE_FAST
lc_for ::= expr LOAD_CONST
FOR_LOOP designator
lc_for JUMP_ABSOLUTE
COME_FROM
lc_for ::= expr LOAD_CONST
FOR_LOOP designator
lc_if JUMP_ABSOLUTE
COME_FROM
lc_for ::= expr LOAD_CONST
FOR_LOOP designator
lc_body JUMP_ABSOLUTE
COME_FROM
lc_if ::= expr condjmp lc_body
JUMP_FORWARD COME_FROM POP_TOP
COME_FROM
lc_body ::= LOAD_NAME expr CALL_FUNCTION_1 POP_TOP
lc_body ::= LOAD_FAST expr CALL_FUNCTION_1 POP_TOP
lc_cleanup ::= DELETE_NAME
lc_cleanup ::= DELETE_FAST
'''
def p_augmented_assign(self, args):
'''
stmt ::= augassign1
stmt ::= augassign2
augassign1 ::= expr expr inplace_op designator
augassign1 ::= expr expr inplace_op ROT_THREE STORE_SUBSCR
augassign1 ::= expr expr inplace_op ROT_TWO STORE_SLICE+0
augassign1 ::= expr expr inplace_op ROT_THREE STORE_SLICE+1
augassign1 ::= expr expr inplace_op ROT_THREE STORE_SLICE+2
augassign1 ::= expr expr inplace_op ROT_FOUR STORE_SLICE+3
augassign2 ::= expr DUP_TOP LOAD_ATTR expr
inplace_op ROT_TWO STORE_ATTR
inplace_op ::= INPLACE_ADD
inplace_op ::= INPLACE_SUBTRACT
inplace_op ::= INPLACE_MULTIPLY
inplace_op ::= INPLACE_DIVIDE
inplace_op ::= INPLACE_MODULO
inplace_op ::= INPLACE_POWER
inplace_op ::= INPLACE_LSHIFT
inplace_op ::= INPLACE_RSHIFT
inplace_op ::= INPLACE_AND
inplace_op ::= INPLACE_XOR
inplace_op ::= INPLACE_OR
'''
def p_assign(self, args):
'''
stmt ::= assign
assign ::= expr DUP_TOP designList
assign ::= expr designator
'''
def p_print(self, args):
'''
stmt ::= print_stmt
stmt ::= print_stmt_nl
stmt ::= print_nl_stmt
print_stmt ::= expr PRINT_ITEM
print_nl_stmt ::= PRINT_NEWLINE
print_stmt_nl ::= print_stmt print_nl_stmt
'''
def p_print_to(self, args):
'''
stmt ::= print_to
stmt ::= print_to_nl
stmt ::= print_nl_to
print_to ::= expr print_to_items POP_TOP
print_to_nl ::= expr print_to_items PRINT_NEWLINE_TO
print_nl_to ::= expr PRINT_NEWLINE_TO
print_to_items ::= print_to_items print_to_item
print_to_items ::= print_to_item
print_to_item ::= DUP_TOP expr ROT_TWO PRINT_ITEM_TO
'''
# expr print_to* POP_TOP
# expr { print_to* } PRINT_NEWLINE_TO
def p_import15(self, args):
'''
stmt ::= importstmt
stmt ::= importfrom
importstmt ::= IMPORT_NAME STORE_FAST
importstmt ::= IMPORT_NAME STORE_NAME
importfrom ::= IMPORT_NAME importlist POP_TOP
importlist ::= importlist IMPORT_FROM
importlist ::= IMPORT_FROM
'''
def p_import20(self, args):
'''
stmt ::= importstmt2
stmt ::= importfrom2
stmt ::= importstar2
importstmt2 ::= LOAD_CONST import_as
importstar2 ::= LOAD_CONST IMPORT_NAME IMPORT_STAR
importfrom2 ::= LOAD_CONST IMPORT_NAME importlist2 POP_TOP
importlist2 ::= importlist2 import_as
importlist2 ::= import_as
import_as ::= IMPORT_NAME STORE_FAST
import_as ::= IMPORT_NAME STORE_NAME
import_as ::= IMPORT_NAME LOAD_ATTR STORE_FAST
import_as ::= IMPORT_NAME LOAD_ATTR STORE_NAME
import_as ::= IMPORT_FROM STORE_FAST
import_as ::= IMPORT_FROM STORE_NAME
'''
# 'import_as' can't use designator, since n_import_as()
# needs to compare both kids' pattr
def p_grammar(self, args):
'''
code ::= stmts
code ::=
stmts ::= stmts stmt
stmts ::= stmt
stmts_opt ::= stmts
stmts_opt ::= passstmt
passstmt ::=
designList ::= designator designator
designList ::= designator DUP_TOP designList
designator ::= STORE_FAST
designator ::= STORE_NAME
designator ::= STORE_GLOBAL
designator ::= expr STORE_ATTR
designator ::= expr STORE_SLICE+0
designator ::= expr expr STORE_SLICE+1
designator ::= expr expr STORE_SLICE+2
designator ::= expr expr expr STORE_SLICE+3
designator ::= store_subscr
store_subscr ::= expr expr STORE_SUBSCR
designator ::= unpack
designator ::= unpack_list
stmt ::= classdef
stmt ::= call_stmt
call_stmt ::= expr POP_TOP
stmt ::= return_stmt
return_stmt ::= expr RETURN_VALUE
stmt ::= break_stmt
break_stmt ::= BREAK_LOOP
stmt ::= continue_stmt
continue_stmt ::= JUMP_ABSOLUTE
stmt ::= raise_stmt
raise_stmt ::= exprlist RAISE_VARARGS
raise_stmt ::= nullexprlist RAISE_VARARGS
stmt ::= exec_stmt
exec_stmt ::= expr exprlist DUP_TOP EXEC_STMT
exec_stmt ::= expr exprlist EXEC_STMT
stmt ::= assert
stmt ::= assert2
stmt ::= ifstmt
stmt ::= ifelsestmt
stmt ::= whilestmt
stmt ::= whileelsestmt
stmt ::= forstmt
stmt ::= forelsestmt
stmt ::= trystmt
stmt ::= tryfinallystmt
stmt ::= DELETE_FAST
stmt ::= DELETE_NAME
stmt ::= DELETE_GLOBAL
stmt ::= expr DELETE_SLICE+0
stmt ::= expr expr DELETE_SLICE+1
stmt ::= expr expr DELETE_SLICE+2
stmt ::= expr expr expr DELETE_SLICE+3
stmt ::= delete_subscr
delete_subscr ::= expr expr DELETE_SUBSCR
stmt ::= expr DELETE_ATTR
kwarg ::= LOAD_CONST expr
classdef ::= LOAD_CONST expr mkfunc
CALL_FUNCTION_0 BUILD_CLASS STORE_NAME
classdef ::= LOAD_CONST expr mkfunc
CALL_FUNCTION_0 BUILD_CLASS STORE_FAST
condjmp ::= JUMP_IF_FALSE POP_TOP
condjmp ::= JUMP_IF_TRUE POP_TOP
assert ::= expr JUMP_IF_FALSE POP_TOP
expr JUMP_IF_TRUE POP_TOP
LOAD_GLOBAL RAISE_VARARGS
COME_FROM COME_FROM POP_TOP
assert2 ::= expr JUMP_IF_FALSE POP_TOP
expr JUMP_IF_TRUE POP_TOP
LOAD_GLOBAL expr RAISE_VARARGS
COME_FROM COME_FROM POP_TOP
ifstmt ::= expr condjmp stmts_opt
JUMP_FORWARD COME_FROM POP_TOP
COME_FROM
ifelsestmt ::= expr condjmp stmts_opt
JUMP_FORWARD COME_FROM
POP_TOP stmts COME_FROM
trystmt ::= SETUP_EXCEPT stmts_opt
POP_BLOCK JUMP_FORWARD
COME_FROM except_stmt
try_end ::= END_FINALLY COME_FROM
try_end ::= except_else
except_else ::= END_FINALLY COME_FROM stmts
except_stmt ::= except_cond except_stmt COME_FROM
except_stmt ::= except_conds try_end COME_FROM
except_stmt ::= except try_end COME_FROM
except_stmt ::= try_end
except_conds ::= except_cond except_conds COME_FROM
except_conds ::=
except_cond ::= except_cond1
except_cond ::= except_cond2
except_cond1 ::= DUP_TOP expr COMPARE_OP
JUMP_IF_FALSE
POP_TOP POP_TOP POP_TOP POP_TOP
stmts_opt JUMP_FORWARD COME_FROM
POP_TOP
except_cond2 ::= DUP_TOP expr COMPARE_OP
JUMP_IF_FALSE
POP_TOP POP_TOP designator POP_TOP
stmts_opt JUMP_FORWARD COME_FROM
POP_TOP
except ::= POP_TOP POP_TOP POP_TOP
stmts_opt JUMP_FORWARD
tryfinallystmt ::= SETUP_FINALLY stmts_opt
POP_BLOCK LOAD_CONST
COME_FROM stmts_opt END_FINALLY
whilestmt ::= SETUP_LOOP
expr JUMP_IF_FALSE POP_TOP
stmts_opt JUMP_ABSOLUTE
COME_FROM POP_TOP POP_BLOCK COME_FROM
whileelsestmt ::= SETUP_LOOP
expr JUMP_IF_FALSE POP_TOP
stmts_opt JUMP_ABSOLUTE
COME_FROM POP_TOP POP_BLOCK
stmts COME_FROM
forstmt ::= SETUP_LOOP expr LOAD_CONST
FOR_LOOP designator
stmts_opt JUMP_ABSOLUTE
COME_FROM POP_BLOCK COME_FROM
forelsestmt ::= SETUP_LOOP expr LOAD_CONST
FOR_LOOP designator
stmts_opt JUMP_ABSOLUTE
COME_FROM POP_BLOCK stmts COME_FROM
'''
def p_expr(self, args):
'''
expr ::= mklambda
expr ::= mkfunc
expr ::= SET_LINENO
expr ::= LOAD_FAST
expr ::= LOAD_NAME
expr ::= LOAD_CONST
expr ::= LOAD_GLOBAL
expr ::= LOAD_LOCALS
expr ::= expr LOAD_ATTR
expr ::= binary_expr
binary_expr ::= expr expr binary_op
binary_op ::= BINARY_ADD
binary_op ::= BINARY_SUBTRACT
binary_op ::= BINARY_MULTIPLY
binary_op ::= BINARY_DIVIDE
binary_op ::= BINARY_MODULO
binary_op ::= BINARY_LSHIFT
binary_op ::= BINARY_RSHIFT
binary_op ::= BINARY_AND
binary_op ::= BINARY_OR
binary_op ::= BINARY_XOR
binary_op ::= BINARY_POWER
expr ::= binary_subscr
binary_subscr ::= expr expr BINARY_SUBSCR
expr ::= expr expr DUP_TOPX_2 BINARY_SUBSCR
expr ::= cmp
expr ::= expr UNARY_POSITIVE
expr ::= expr UNARY_NEGATIVE
expr ::= expr UNARY_CONVERT
expr ::= expr UNARY_INVERT
expr ::= expr UNARY_NOT
expr ::= mapexpr
expr ::= expr SLICE+0
expr ::= expr expr SLICE+1
expr ::= expr expr SLICE+2
expr ::= expr expr expr SLICE+3
expr ::= expr DUP_TOP SLICE+0
expr ::= expr expr DUP_TOPX_2 SLICE+1
expr ::= expr expr DUP_TOPX_2 SLICE+2
expr ::= expr expr expr DUP_TOPX_3 SLICE+3
expr ::= and
expr ::= or
or ::= expr JUMP_IF_TRUE POP_TOP expr COME_FROM
and ::= expr JUMP_IF_FALSE POP_TOP expr COME_FROM
cmp ::= cmp_list
cmp ::= compare
compare ::= expr expr COMPARE_OP
cmp_list ::= expr cmp_list1 ROT_TWO POP_TOP
COME_FROM
cmp_list1 ::= expr DUP_TOP ROT_THREE
COMPARE_OP JUMP_IF_FALSE POP_TOP
cmp_list1 COME_FROM
cmp_list1 ::= expr DUP_TOP ROT_THREE
COMPARE_OP JUMP_IF_FALSE POP_TOP
cmp_list2 COME_FROM
cmp_list2 ::= expr COMPARE_OP JUMP_FORWARD
mapexpr ::= BUILD_MAP kvlist
kvlist ::= kvlist kv
kvlist ::=
kv ::= DUP_TOP expr ROT_TWO expr STORE_SUBSCR
exprlist ::= exprlist expr
exprlist ::= expr
nullexprlist ::=
'''
def nonterminal(self, nt, args):
collect = ('stmts', 'exprlist', 'kvlist')
if nt in collect and len(args) > 1:
#
# Collect iterated thingies together.
#
rv = args[0]
rv.append(args[1])
else:
rv = GenericASTBuilder.nonterminal(self, nt, args)
return rv
def __ambiguity(self, children):
# only for debugging! to be removed hG/2000-10-15
print children
return GenericASTBuilder.ambiguity(self, children)
def resolve(self, list):
if len(list) == 2 and 'funcdef' in list and 'assign' in list:
return 'funcdef'
#sys.stderr.writelines( ['resolve ', str(list), '\n'] )
return GenericASTBuilder.resolve(self, list)
nop = lambda self, args: None
def parse(tokens, customize):
p = Parser()
#
# Special handling for opcodes that take a variable number
# of arguments -- we add a new rule for each:
#
# expr ::= {expr}^n BUILD_LIST_n
# expr ::= {expr}^n BUILD_TUPLE_n
# expr ::= {expr}^n BUILD_SLICE_n
# unpack_list ::= UNPACK_LIST {expr}^n
# unpack ::= UNPACK_TUPLE {expr}^n
# unpack ::= UNPACK_SEQEUENE {expr}^n
# mkfunc ::= {expr}^n LOAD_CONST MAKE_FUNCTION_n
# expr ::= expr {expr}^n CALL_FUNCTION_n
# expr ::= expr {expr}^n CALL_FUNCTION_VAR_n POP_TOP
# expr ::= expr {expr}^n CALL_FUNCTION_VAR_KW_n POP_TOP
# expr ::= expr {expr}^n CALL_FUNCTION_KW_n POP_TOP
#
for k, v in customize.items():
## avoid adding the same rule twice to this parser
#if p.customized.has_key(k):
# continue
#p.customized[k] = None
#nop = lambda self, args: None
op = k[:string.rfind(k, '_')]
if op in ('BUILD_LIST', 'BUILD_TUPLE', 'BUILD_SLICE'):
rule = 'expr ::= ' + 'expr '*v + k
elif op in ('UNPACK_TUPLE', 'UNPACK_SEQUENCE'):
rule = 'unpack ::= ' + k + ' designator'*v
elif op == 'UNPACK_LIST':
rule = 'unpack_list ::= ' + k + ' designator'*v
elif op == 'DUP_TOPX':
# no need to add a rule
pass
#rule = 'dup_topx ::= ' + 'expr '*v + k
elif op == 'MAKE_FUNCTION':
p.addRule('mklambda ::= %s LOAD_LAMBDA %s' %
('expr '*v, k), nop)
rule = 'mkfunc ::= %s LOAD_CONST %s' % ('expr '*v, k)
elif op in ('CALL_FUNCTION', 'CALL_FUNCTION_VAR',
'CALL_FUNCTION_VAR_KW', 'CALL_FUNCTION_KW'):
na = (v & 0xff) # positional parameters
nk = (v >> 8) & 0xff # keyword parameters
# number of apply equiv arguments:
nak = ( len(op)-len('CALL_FUNCTION') ) / 3
rule = 'expr ::= expr ' + 'expr '*na + 'kwarg '*nk \
+ 'expr ' * nak + k
else:
raise 'unknown customize token %s' % k
p.addRule(rule, nop)
ast = p.parse(tokens)
p.cleanup()
return ast
#
# Decompilation (walking AST)
#
# All table-driven. Step 1 determines a table (T) and a path to a
# table key (K) from the node type (N) (other nodes are shown as O):
#
# N N N&K
# / | ... \ / | ... \ / | ... \
# O O O O O K O O O
# |
# K
#
# MAP_R0 (TABLE_R0) MAP_R (TABLE_R) MAP_DIRECT (TABLE_DIRECT)
#
# The default is a direct mapping. The key K is then extracted from the
# subtree and used to find a table entry T[K], if any. The result is a
# format string and arguments (a la printf()) for the formatting engine.
# Escapes in the format string are:
#
# %c evaluate N[A] recursively*
# %C evaluate N[A[0]]..N[A[1]] recursively, separate by A[2]*
# %, print ',' if last %C only printed one item (for tuples)
# %| tab to current indentation level
# %+ increase current indentation level
# %- decrease current indentation level
# %{...} evaluate ... in context of N
# %% literal '%'
#
# * indicates an argument (A) required.
#
# The '%' may optionally be followed by a number (C) in square brackets, which
# makes the engine walk down to N[C] before evaluating the escape code.
#
from spark import GenericASTTraversal
#TAB = '\t' # as God intended
TAB = ' ' *4 # is less spacy than "\t"
TABLE_R = {
'build_tuple2': ( '%C', (0,-1,', ') ),
'POP_TOP': ( '%|%c\n', 0 ),
'STORE_ATTR': ( '%c.%[1]{pattr}', 0),
# 'STORE_SUBSCR': ( '%c[%c]', 0, 1 ),
'STORE_SLICE+0':( '%c[:]', 0 ),
'STORE_SLICE+1':( '%c[%c:]', 0, 1 ),
'STORE_SLICE+2':( '%c[:%c]', 0, 1 ),
'STORE_SLICE+3':( '%c[%c:%c]', 0, 1, 2 ),
'JUMP_ABSOLUTE':( '%|continue\n', ),
'DELETE_SLICE+0':( '%|del %c[:]\n', 0 ),
'DELETE_SLICE+1':( '%|del %c[%c:]\n', 0, 1 ),
'DELETE_SLICE+2':( '%|del %c[:%c]\n', 0, 1 ),
'DELETE_SLICE+3':( '%|del %c[%c:%c]\n', 0, 1, 2 ),
'DELETE_ATTR': ( '%|del %c.%[-1]{pattr}\n', 0 ),
#'EXEC_STMT': ( '%|exec %c in %[1]C\n', 0, (0,sys.maxint,', ') ),
'BINARY_SUBSCR':( '%c[%c]', 0, 1), # required for augmented assign
'UNARY_POSITIVE':( '+%c', 0 ),
'UNARY_NEGATIVE':( '-%c', 0 ),
'UNARY_CONVERT':( '`%c`', 0 ),
'UNARY_INVERT': ( '~%c', 0 ),
'UNARY_NOT': ( '(not %c)', 0 ),
'SLICE+0': ( '%c[:]', 0 ),
'SLICE+1': ( '%c[%c:]', 0, 1 ),
'SLICE+2': ( '%c[:%c]', 0, 1 ),
'SLICE+3': ( '%c[%c:%c]', 0, 1, 2 ),
}
TABLE_R0 = {
# 'BUILD_LIST': ( '[%C]', (0,-1,', ') ),
# 'BUILD_TUPLE': ( '(%C)', (0,-1,', ') ),
# 'CALL_FUNCTION':( '%c(%C)', 0, (1,-1,', ') ),
}
TABLE_DIRECT = {
'BINARY_ADD': ( '+' ,),
'BINARY_SUBTRACT': ( '-' ,),
'BINARY_MULTIPLY': ( '*' ,),
'BINARY_DIVIDE': ( '/' ,),
'BINARY_MODULO': ( '%%',),
'BINARY_POWER': ( '**',),
'BINARY_LSHIFT': ( '<<',),
'BINARY_RSHIFT': ( '>>',),
'BINARY_AND': ( '&' ,),
'BINARY_OR': ( '|' ,),
'BINARY_XOR': ( '^' ,),
'INPLACE_ADD': ( '+=' ,),
'INPLACE_SUBTRACT': ( '-=' ,),
'INPLACE_MULTIPLY': ( '*=' ,),
'INPLACE_DIVIDE': ( '/=' ,),
'INPLACE_MODULO': ( '%%=',),
'INPLACE_POWER': ( '**=',),
'INPLACE_LSHIFT': ( '<<=',),
'INPLACE_RSHIFT': ( '>>=',),
'INPLACE_AND': ( '&=' ,),
'INPLACE_OR': ( '|=' ,),
'INPLACE_XOR': ( '^=' ,),
'binary_expr': ( '(%c %c %c)', 0, -1, 1 ),
'IMPORT_FROM': ( '%{pattr}', ),
'LOAD_ATTR': ( '.%{pattr}', ),
'LOAD_FAST': ( '%{pattr}', ),
'LOAD_NAME': ( '%{pattr}', ),
'LOAD_GLOBAL': ( '%{pattr}', ),
'LOAD_LOCALS': ( 'locals()', ),
#'LOAD_CONST': ( '%{pattr}', ), handled below
'DELETE_FAST': ( '%|del %{pattr}\n', ),
'DELETE_NAME': ( '%|del %{pattr}\n', ),
'DELETE_GLOBAL':( '%|del %{pattr}\n', ),
'delete_subscr':( '%|del %c[%c]\n', 0, 1,),
'binary_subscr':( '%c[%c]', 0, 1),
'store_subscr': ( '%c[%c]', 0, 1),
'STORE_FAST': ( '%{pattr}', ),
'STORE_NAME': ( '%{pattr}', ),
'STORE_GLOBAL': ( '%{pattr}', ),
'unpack': ( '(%C,)', (1, sys.maxint, ', ') ),
'unpack_list': ( '[%C]', (1, sys.maxint, ', ') ),
'list_compr': ( '[ %c ]', 1),
# 'lc_for': ( ' for %c in %c', 3, 0 ),
'lc_for_nest': ( ' for %c in %c%c', 3, 0, 4 ),
'lc_if': ( ' if %c', 0 ),
'lc_body': ( '%c', 1),
'lc_body__': ( '', ),
'assign': ( '%|%c = %c\n', -1, 0 ),
'augassign1': ( '%|%c %c %c\n', 0, 2, 1),
'augassign2': ( '%|%c%c %c %c\n', 0, 2, -3, -4),
#'dup_topx': ('%c', 0),
'designList': ( '%c = %c', 0, -1 ),
'and': ( '(%c and %c)', 0, 3 ),
'or': ( '(%c or %c)', 0, 3 ),
'compare': ( '(%c %[-1]{pattr} %c)', 0, 1 ),
'cmp_list': ('%c %c', 0, 1),
'cmp_list1': ('%[3]{pattr} %c %c', 0, -2),
'cmp_list2': ('%[1]{pattr} %c', 0),
'classdef': ( '\n%|class %[0]{pattr[1:-1]}%c:\n%+%{build_class}%-', 1 ),
'funcdef': ( '\n%|def %c\n', 0),
'kwarg': ( '%[0]{pattr[1:-1]}=%c', 1),
'importstmt': ( '%|import %[0]{pattr}\n', ),
'importfrom': ( '%|from %[0]{pattr} import %c\n', 1 ),
'importlist': ( '%C', (0, sys.maxint, ', ') ),
'importstmt2': ( '%|import %c\n', 1),
'importstar2': ( '%|from %[1]{pattr} import *\n', ),
'importfrom2': ( '%|from %[1]{pattr} import %c\n', 2 ),
'importlist2': ( '%C', (0, sys.maxint, ', ') ),
'assert': ( '%|assert %c\n' , 3 ),
'assert2': ( '%|assert %c, %c\n' , 3, -5 ),
'print_stmt': ( '%|print %c,\n', 0 ),
'print_stmt_nl': ( '%|print %[0]C\n', (0,1, None) ),
'print_nl_stmt': ( '%|print\n', ),
'print_to': ( '%|print >> %c, %c,\n', 0, 1 ),
'print_to_nl': ( '%|print >> %c, %c\n', 0, 1 ),
'print_nl_to': ( '%|print >> %c\n', 0 ),
'print_to_items': ( '%C', (0, 2, ', ') ),
'call_stmt': ( '%|%c\n', 0),
'break_stmt': ( '%|break\n', ),
'continue_stmt':( '%|continue\n', ),
'raise_stmt': ( '%|raise %[0]C\n', (0,sys.maxint,', ') ),
'return_stmt': ( '%|return %c\n', 0),
'return_lambda': ( '%c', 0),
'ifstmt': ( '%|if %c:\n%+%c%-', 0, 2 ),
'ifelsestmt': ( '%|if %c:\n%+%c%-%|else:\n%+%c%-', 0, 2, -2 ),
'ifelifstmt': ( '%|if %c:\n%+%c%-%c', 0, 2, -2 ),
'elifelifstmt': ( '%|elif %c:\n%+%c%-%c', 0, 2, -2 ),
'elifstmt': ( '%|elif %c:\n%+%c%-', 0, 2 ),
'elifelsestmt': ( '%|elif %c:\n%+%c%-%|else:\n%+%c%-', 0, 2, -2 ),
'whilestmt': ( '%|while %c:\n%+%c%-\n', 1, 4 ),
'whileelsestmt':( '%|while %c:\n%+%c%-\n%|else:\n%+%c%-\n', 1, 4, 9 ),
'forstmt': ( '%|for %c in %c:\n%+%c%-\n', 4, 1, 5 ),
'forelsestmt': (
'%|for %c in %c:\n%+%c%-\n%|else:\n%+%c%-\n', 4, 1, 5, 9
),
'trystmt': ( '%|try:\n%+%c%-%c', 1, 5 ),
'except': ( '%|except:\n%+%c%-', 3 ),
'except_cond1': ( '%|except %c:\n%+%c%-', 1, 8 ),
'except_cond2': ( '%|except %c, %c:\n%+%c%-', 1, 6, 8 ),
'except_else': ( '%|else:\n%+%c%-', 2 ),
'tryfinallystmt':( '%|try:\n%+%c%-\n%|finally:\n%+%c%-\n', 1, 5 ),
'passstmt': ( '%|pass\n', ),
'STORE_FAST': ( '%{pattr}', ),
'kv': ( '%c: %c', 3, 1 ),
'mapexpr': ( '{%[1]C}', (0,sys.maxint,', ') ),
}
MAP_DIRECT = (TABLE_DIRECT, )
MAP_R0 = (TABLE_R0, -1, 0)
MAP_R = (TABLE_R, -1)
MAP = {
'stmt': MAP_R,
'designator': MAP_R,
'expr': MAP_R,
'exprlist': MAP_R0,
}
ASSIGN_TUPLE_PARAM = lambda param_name: \
AST('expr', [ Token('LOAD_FAST', pattr=param_name) ])
def get_tuple_parameter(ast, name):
"""
If the name of the formal parameter starts with dot,
it's a tuple parameter, like this:
def MyFunc(xx, (a,b,c), yy):
print a, b*2, c*42
In byte-code, the whole tuple is assigned to parameter '.1' and
then the tuple gets unpacked to 'a', 'b' and 'c'.
Since identifiers starting with a dot are illegal in Python,
we can search for the byte-code equivalent to '(a,b,c) = .1'
"""
assert ast == 'code' and ast[0] == 'stmts'
for i in xrange(len(ast[0])):
# search for an assign-statement
assert ast[0][i] == 'stmt'
node = ast[0][i][0]
if node == 'assign' \
and node[0] == ASSIGN_TUPLE_PARAM(name):
# okay, this assigns '.n' to something
del ast[0][i]
# walk lhs; this
# returns a tuple of identifiers as used
# within the function definition
assert node[1] == 'designator'
# if lhs is not a UNPACK_TUPLE (or equiv.),
# add parenteses to make this a tuple
if node[1][0] not in ('unpack', 'unpack_list'):
return '(' + walk(node[1]) + ')'
return walk(node[1])
raise "Can't find tuple parameter" % name
def make_function(self, code, defparams, isLambda, nested=1):
"""Dump function defintion, doc string, and function body."""
def build_param(ast, name, default):
"""build parameters:
- handle defaults
- handle format tuple parameters
"""
# if formal parameter is a tuple, the paramater name
# starts with a dot (eg. '.1', '.2')
if name[0] == '.':
# replace the name with the tuple-string
name = get_tuple_parameter(ast, name)
if default:
if Showast:
print '--', name
print default
print '--'
result = '%s = %s' % ( name, walk(default, indent=0) )
##w = Walk(default, 0)
##result = '%s = %s' % ( name, w.traverse() )
##del w # hg/2000-09-03
if result[-2:] == '= ': # default was 'LOAD_CONST None'
result = result + 'None'
return result
else:
return name
def writeParams(self, params):
for i in range(len(params)):
if i > 0: self.f.write(', ')
self.f.write(params[i])
assert type(code) == types.CodeType
code = Code(code)
#assert isinstance(code, Code)
ast = _build_ast(self.f, code._tokens, code._customize)
code._tokens = None # save memory
assert ast == 'code' and ast[0] == 'stmts'
if isLambda:
# convert 'return' statement to expression
#assert len(ast[0]) == 1 wrong, see 'lambda (r,b): r,b,g'
assert ast[-1][-1] == 'stmt'
assert len(ast[-1][-1]) == 1
assert ast[-1][-1][0] == 'return_stmt'
ast[-1][-1][0].type = 'return_lambda'
else:
if ast[0][-1] == RETURN_NONE:
# Python adds a 'return None' to the
# end of any function; remove it
ast[0].pop() # remove last node
# add defaults values to parameter names
argc = code.co_argcount
paramnames = list(code.co_varnames[:argc])
# defaults are for last n parameters, thus reverse
paramnames.reverse(); defparams.reverse()
# build parameters
#
##This would be a nicer piece of code, but I can't get this to work
## now, have to find a usable lambda constuct hG/2000-09-05
##params = map(lambda name, default: build_param(ast, name, default),
## paramnames, defparams)
params = []
for name, default in map(lambda a,b: (a,b), paramnames, defparams):
params.append( build_param(ast, name, default) )
params.reverse() # back to correct order
if 4 & code.co_flags: # flag 2 -> variable number of args
params.append('*%s' % code.co_varnames[argc])
argc = argc +1
if 8 & code.co_flags: # flag 3 -> keyword args
params.append('**%s' % code.co_varnames[argc])
argc = argc +1
# dump parameter list (with default values)
indent = TAB * self.indent
if isLambda:
self.f.write('lambda ')
writeParams(self, params)
self.f.write(': ')
else:
self.f.write('(')
writeParams(self, params)
self.f.write('):\n')
#self.f.write('%s#flags:\t%i\n' % (indent, code.co_flags))
if code.co_consts[0] != None: # docstring exists, dump it
self.f.writelines([indent, `code.co_consts[0]`, '\n'])
_gen_source(self.f, ast, code._customize, self.indent,
isLambda=isLambda)
code._tokens = None; code._customize = None # save memory
def build_class(self, code):
"""Dump class definition, duc string and class body."""
assert type(code) == types.CodeType
code = Code(code)
#assert isinstance(code, Code)
indent = TAB * self.indent
#self.f.write('%s#flags:\t%i\n' % (indent, code.co_flags))
ast = _build_ast(self.f, code._tokens, code._customize)
code._tokens = None # save memory
assert ast == 'code' and ast[0] == 'stmts'
# if docstring exists, dump it
if code.co_consts[0] != None \
and ast[0][0] == ASSIGN_DOC_STRING(code.co_consts[0]):
#print '\n\n>>-->>doc string set\n\n'
self.f.writelines( [indent,repr(code.co_consts[0]), '\n'] )
del ast[0][0]
# the function defining a class normally returns locals(); we
# don't want this to show up in the source, thus remove the node
if ast[0][-1] == RETURN_LOCALS:
ast[0].pop() # remove last node
_gen_source(self.f, ast, code._customize, self.indent)
code._tokens = None; code._customize = None # save memory
__globals_tokens__ = ('STORE_GLOBAL', 'DELETE_GLOBAL') # 'LOAD_GLOBAL'
def find_globals(node, globals):
"""Find globals in this statement."""
for n in node:
if isinstance(n, AST):
if n != 'stmt': # skip nested statements
globals = find_globals(n, globals)
elif n.type in __globals_tokens__:
globals[n.pattr] = None
return globals
class Walk(GenericASTTraversal):
def __init__(self, ast, indent=0, isLambda=0):
GenericASTTraversal.__init__(self, ast)
self._globals = {}
self.f = cStringIO.StringIO()
self.f.seek(0)
self.indent = indent
self.isLambda = isLambda
def __del__(self):
self.f.close()
def traverse(self, node=None):
self.preorder(node)
return self.f.getvalue()
def n_LOAD_CONST(self, node):
data = node.pattr
if data == 'None':
# LOAD_CONST 'None' only occurs, when None is
# implicit eg. in 'return' w/o params
pass
elif data == 'Ellipsis':
self.f.write('...')
elif data[0] == '-': # assume negative integer constant
# convert to hex, since decimal representation
# would result in 'LOAD_CONST; UNARY_NEGATIVE'
self.f.write('0x%x' % int(data))
else:
self.f.write(data)
def n_delete_subscr(self, node):
#print >>self.f, '>#', node
#print >>self.f, '---'
maybe_tuple = node[-2][-1]
#print >>self.f, '##', maybe_tuple, maybe_tuple.type[:11]
if maybe_tuple.type[:11] == 'BUILD_TUPLE':
maybe_tuple.type = 'build_tuple2'
#print >>self.f, '##', node
#print >>self.f, '##', maybe_tuple.type
self.default(node)
n_store_subscr = n_binary_subscr = n_delete_subscr
def __n_stmts(self, node):
# optimize "print 1, ; print"
last = None; i = 0
while i < len(node):
n = node[i]
assert(n == 'stmt')
if n[0] == 'print_nl_stmt' and \
last is not None and \
last[0] == 'print_stmt':
last[0].type = 'print_stmt_nl'
del node[i]
last = None
else:
last = n
i = i + 1
self.default(node)
def n_stmt(self, node):
if not self.isLambda:
indent = TAB * self.indent
for g in find_globals(node, {}).keys():
self.f.writelines( [indent,
'global ',
g, '\n'] )
## nice output does not work since engine()
## creates a new Walk instance when recursing
## TODO: reconsider this: engine() no longer
## creates a new Walk instancew hG/2000-12-31
## if not self._globals.has_key(g):
## self._globals[g] = None
## self.f.writelines( [TAB * self.indent,
## 'global ',
## g, '\n'] )
self.default(node)
def n_exec_stmt(self, node):
"""
exec_stmt ::= expr exprlist DUP_TOP EXEC_STMT
exec_stmt ::= expr exprlist EXEC_STMT
"""
w = Walk(node, indent=self.indent)
w.engine(( '%|exec %c in %[1]C', 0, (0,sys.maxint,', ') ),
node)
s = w.f.getvalue()
del w
if s[-3:] == 'in ':
s = s[:-3]
self.f.writelines( [s, '\n'] )
node[:] = [] # avoid print out when recursive descenting
def n_ifelsestmt(self, node, preprocess=0):
if len(node[-2]) == 1:
ifnode = node[-2][0][0]
if ifnode == 'ifelsestmt':
node.type = 'ifelifstmt'
self.n_ifelsestmt(ifnode, preprocess=1)
if ifnode == 'ifelifstmt':
ifnode.type = 'elifelifstmt'
elif ifnode == 'ifelsestmt':
ifnode.type = 'elifelsestmt'
elif ifnode == 'ifstmt':
node.type = 'ifelifstmt'
ifnode.type = 'elifstmt'
if not preprocess:
self.default(node)
def n_import_as(self, node):
iname = node[0].pattr; sname = node[-1].pattr
if iname == sname \
or iname[:len(sname)+1] == (sname+'.'):
self.f.write(iname)
else:
self.f.writelines([iname, ' as ', sname])
node[:] = [] # avoid print out when recursive descenting
def n_mkfunc(self, node):
defparams = node[0:-2]
code = node[-2].attr
node[:] = [] # avoid print out when recursive descenting
self.indent = self.indent + 1
self.f.write(code.co_name)
make_function(self, code, defparams, isLambda=0)
self.indent = self.indent - 1
def n_mklambda(self, node):
defparams = node[0:-2]
code = node[-2].attr
node[:] = [] # avoid print out when recursive descenting
make_function(self, code, defparams, isLambda=1)
def n_classdef(self, node):
self.f.writelines(['\n', TAB * self.indent, 'class '])
self.f.write(node[0].pattr[1:-1])
node._code = node[-4][0].attr
# avoid print out when recursive descenting
if node[1] == BUILD_TUPLE_0:
node[:] = []
else:
node[:] = [ node[1] ]
def n_classdef_exit(self, node):
self.f.write(':\n')
self.indent = self.indent +1
# '\n%|class %[0]{pattr[1:-1]}%c:\n%+%{build_class}%-', 1 ),
# -4 -> MAKE_FUNCTION; -2 -> LOAD_CONST (code)
build_class(self,node._code)
self.indent = self.indent -1
node._code = None # save memory
def n_lc_for(self, node):
node.type = 'lc_for_nest'
content = node[4]
while content == 'lc_for':
content.type = 'lc_for_nest'
content = content[4]
while content == 'lc_if':
content = content[2]
assert content == 'lc_body'
self.preorder(content)
content.type = 'lc_body__'
self.default(node)
def engine(self, entry, startnode):
#self.f.write("-----\n")
#self.f.write(str(startnode.__dict__)); self.f.write('\n')
escape = re.compile(r'''
% ( \[ (?P<child> -? \d+ ) \] )?
((?P<type> [^{] ) |
( [{] (?P<expr> [^}]* ) [}] ))
''', re.VERBOSE)
fmt = entry[0]
n = len(fmt)
lastC = 0
arg = 1
i = 0
while i < n:
m = escape.match(fmt, i)
if m is None:
self.f.write(fmt[i])
i = i + 1
continue
i = m.end()
typ = m.group('type') or '{'
node = startnode
try:
if m.group('child'):
node = node[string.atoi(m.group('child'))]
except:
print node.__dict__
raise
if typ == '%':
self.f.write('%')
elif typ == '+':
self.indent = self.indent + 1
elif typ == '-':
self.indent = self.indent - 1
elif typ == '|':
self.f.write(TAB * self.indent)
elif typ == ',':
if lastC == 1:
self.f.write(',')
elif typ == 'c':
self.traverse(node[entry[arg]])
##w = Walk(node[entry[arg]], self.indent)
##self.f.write(w.traverse())
##del w # hg/2000-09-03
arg = arg + 1
elif typ == 'C':
low, high, sep = entry[arg]
lastC = remaining = len(node[low:high])
for subnode in node[low:high]:
self.traverse(subnode)
##w = Walk(subnode, self.indent)
##self.f.write(w.traverse())
##del w # hg/2000-09-03
remaining = remaining - 1
if remaining > 0:
self.f.write(sep)
arg = arg + 1
elif typ == '{':
d = node.__dict__
expr = m.group('expr')
if expr == 'build_class':
# -4 -> MAKE_FUNCTION; -2 -> LOAD_CONST (code)
build_class(self,node[-4][-2].attr)
else:
try:
self.f.write(eval(expr, d, d))
except:
print node
raise
def default(self, node):
mapping = MAP.get(node, MAP_DIRECT)
table = mapping[0]
key = node
for i in mapping[1:]:
key = key[i]
if table.has_key(key):
self.engine(table[key], node)
self.prune()
def walk(ast, customize={}, indent=0, isLambda=0):
w = Walk(ast, indent, isLambda=isLambda)
#
# Special handling for opcodes that take a variable number
# of arguments -- we add a new entry for each in TABLE_R.
#
for k, v in customize.items():
op = k[:string.rfind(k, '_')]
if op == 'BUILD_LIST':
TABLE_R[k] = ( '[%C]', (0,-1,', ') )
elif op == 'BUILD_SLICE':
TABLE_R[k] = ( '%C', (0,-1,':') )
elif op == 'BUILD_TUPLE':
TABLE_R[k] = ( '(%C%,)', (0,-1,', ') )
elif op == 'CALL_FUNCTION':
TABLE_R[k] = ( '%c(%C)', 0, (1,-1,', ') )
elif op in ('CALL_FUNCTION_VAR',
'CALL_FUNCTION_VAR_KW', 'CALL_FUNCTION_KW'):
if v == 0:
str = '%c(%C' # '%C' is a dummy here ...
p2 = (0, 0, None) # .. because of this
else:
str = '%c(%C, '
p2 = (1,-2, ', ')
if op == 'CALL_FUNCTION_VAR':
str = str + '*%c)'
entry = (str, 0, p2, -2)
elif op == 'CALL_FUNCTION_KW':
str = str + '**%c)'
entry = (str, 0, p2, -2)
else:
str = str + '*%c, **%c)'
if p2[2]: p2 = (1,-3, ', ')
entry = (str, 0, p2, -3, -2)
TABLE_R[k] = entry
result = w.traverse()
return result
#-- end of (de-)compiler ---
#-- start
Showasm = 0
Showast = 0
__real_out = None
def _tokenize(out, co):
"""Disassemble code object into a token list"""
assert type(co) == types.CodeType
tokens, customize = disassemble(co)
# See the disassembly..
if Showasm and out is not None:
for t in tokens:
out.write('%s\n' % t)
out.write('\n')
return tokens, customize
def _build_ast(out, tokens, customize):
assert type(tokens) == types.ListType
assert isinstance(tokens[0], Token)
# Build AST from disassembly.
try:
ast = parse(tokens, customize)
except: # parser failed, dump disassembly
#if not Showasm:
__real_out.write('--- This code section failed: ---\n')
for t in tokens:
__real_out.write('%s\n' % t)
__real_out.write('\n')
raise
return ast
def _gen_source(out, ast, customize, indent=0, isLambda=0):
"""convert AST to source code"""
if Showast:
out.write(`ast`)
# if code would be empty, append 'pass'
if len(ast[0]) == 0:
out.write(indent * TAB)
out.write('pass\n')
else:
out.write(walk(ast, customize, indent, isLambda=isLambda))
def decompyle(co, out=None, indent=0, showasm=0, showast=0):
"""
diassembles a given code block 'co'
"""
assert type(co) == types.CodeType
global Showasm, Showast
Showasm = showasm
Showast = showast
if not out:
out = sys.stdout
global __real_out
__real_out = out # store final output stream for case of error
tokens, customize = _tokenize(out, co)
ast = _build_ast(out, tokens, customize)
tokens = None # save memory
assert ast == 'code' and ast[0] == 'stmts'
# convert leading '__doc__ = "..." into doc string
if ast[0][0] == ASSIGN_DOC_STRING(co.co_consts[0]):
out.writelines( [repr(co.co_consts[0]), '\n'] )
del ast[0][0]
if ast[0][-1] == RETURN_NONE:
ast[0].pop() # remove last node
#todo: if empty, add 'pass'
_gen_source(out, ast, customize, indent)
def decompyle_file(filename, outstream=None, showasm=0, showast=0):
"""
decompile Python byte-code file (.pyc)
"""
co = _load_module(filename)
decompyle(co, out=outstream, showasm=showasm, showast=showast)
co = None