You've already forked python-uncompyle6
mirror of
https://github.com/rocky/python-uncompyle6.git
synced 2025-08-03 00:45:53 +08:00
792 lines
33 KiB
Python
Executable File
792 lines
33 KiB
Python
Executable File
# Copyright (c) 2015, 2016 by Rocky Bernstein
|
|
# Copyright (c) 2005 by Dan Pascu <dan@windowmaker.org>
|
|
# Copyright (c) 2000-2002 by hartmut Goebel <h.goebel@crazy-compilers.com>
|
|
"""
|
|
Python 2 Generic bytecode scanner/deparser
|
|
|
|
This overlaps various Python3's dis module, but it can be run from
|
|
Python versions other than the version running this code. Notably,
|
|
run from Python version 2.
|
|
|
|
Also we *modify* the instruction sequence to assist deparsing code.
|
|
For example:
|
|
- we add "COME_FROM" instructions to help in figuring out
|
|
conditional branching and looping.
|
|
- LOAD_CONSTs are classified further into the type of thing
|
|
they load:
|
|
lambda's, genexpr's, {dict,set,list} comprehension's,
|
|
- PARAMETER counts appended {CALL,MAKE}_FUNCTION, BUILD_{TUPLE,SET,SLICE}
|
|
|
|
Finally we save token information.
|
|
"""
|
|
|
|
from __future__ import print_function
|
|
|
|
import inspect
|
|
from collections import namedtuple
|
|
from array import array
|
|
|
|
from xdis.code import iscode
|
|
from xdis.bytecode import findlinestarts
|
|
|
|
import uncompyle6.scanner as scan
|
|
|
|
class Scanner2(scan.Scanner):
|
|
def __init__(self, version, show_asm=None):
|
|
scan.Scanner.__init__(self, version, show_asm)
|
|
self.pop_jump_if = frozenset([self.opc.PJIF, self.opc.PJIT])
|
|
self.jump_forward = frozenset([self.opc.JA, self.opc.JF])
|
|
|
|
def disassemble(self, co, classname=None, code_objects={}, show_asm=None):
|
|
"""
|
|
Disassemble a Python 2 code object, returning a list of 'Token'.
|
|
Various tranformations are made to assist the deparsing grammar.
|
|
For example:
|
|
- various types of LOAD_CONST's are categorized in terms of what they load
|
|
- COME_FROM instructions are added to assist parsing control structures
|
|
- MAKE_FUNCTION and FUNCTION_CALLS append the number of positional aruments
|
|
The main part of this procedure is modelled after
|
|
dis.disassemble().
|
|
"""
|
|
|
|
show_asm = self.show_asm if not show_asm else show_asm
|
|
# show_asm = 'before'
|
|
if show_asm in ('both', 'before'):
|
|
from xdis.bytecode import Bytecode
|
|
bytecode = Bytecode(co, self.opc)
|
|
for instr in bytecode.get_instructions(co):
|
|
print(instr._disassemble())
|
|
|
|
# Container for tokens
|
|
tokens = []
|
|
|
|
customize = {}
|
|
Token = self.Token # shortcut
|
|
|
|
n = self.setup_code(co)
|
|
|
|
self.build_lines_data(co, n)
|
|
self.build_prev_op(n)
|
|
|
|
# self.lines contains (block,addrLastInstr)
|
|
if classname:
|
|
classname = '_' + classname.lstrip('_') + '__'
|
|
|
|
def unmangle(name):
|
|
if name.startswith(classname) and name[-2:] != '__':
|
|
return name[len(classname) - 2:]
|
|
return name
|
|
|
|
free = [ unmangle(name) for name in (co.co_cellvars + co.co_freevars) ]
|
|
names = [ unmangle(name) for name in co.co_names ]
|
|
varnames = [ unmangle(name) for name in co.co_varnames ]
|
|
else:
|
|
free = co.co_cellvars + co.co_freevars
|
|
names = co.co_names
|
|
varnames = co.co_varnames
|
|
self.names = names
|
|
|
|
self.load_asserts = set()
|
|
for i in self.op_range(0, n):
|
|
if self.code[i] == self.opc.PJIT and self.code[i+3] == self.opc.LOAD_GLOBAL:
|
|
if names[self.get_argument(i+3)] == 'AssertionError':
|
|
self.load_asserts.add(i+3)
|
|
|
|
cf = self.find_jump_targets()
|
|
# contains (code, [addrRefToCode])
|
|
last_stmt = self.next_stmt[0]
|
|
i = self.next_stmt[last_stmt]
|
|
replace = {}
|
|
while i < n-1:
|
|
if self.lines[last_stmt].next > i:
|
|
if self.code[last_stmt] == self.opc.PRINT_ITEM:
|
|
if self.code[i] == self.opc.PRINT_ITEM:
|
|
replace[i] = 'PRINT_ITEM_CONT'
|
|
elif self.code[i] == self.opc.PRINT_NEWLINE:
|
|
replace[i] = 'PRINT_NEWLINE_CONT'
|
|
last_stmt = i
|
|
i = self.next_stmt[i]
|
|
|
|
imports = self.all_instr(0, n, (self.opc.IMPORT_NAME, self.opc.IMPORT_FROM,
|
|
self.opc.IMPORT_STAR))
|
|
if len(imports) > 1:
|
|
last_import = imports[0]
|
|
for i in imports[1:]:
|
|
if self.lines[last_import].next > i:
|
|
if self.code[last_import] == self.opc.IMPORT_NAME == self.code[i]:
|
|
replace[i] = 'IMPORT_NAME_CONT'
|
|
last_import = i
|
|
|
|
extended_arg = 0
|
|
for offset in self.op_range(0, n):
|
|
if offset in cf:
|
|
k = 0
|
|
for j in cf[offset]:
|
|
tokens.append(Token('COME_FROM', None, repr(j),
|
|
offset="%s_%d" % (offset, k)))
|
|
k += 1
|
|
|
|
op = self.code[offset]
|
|
opname = self.opc.opname[op]
|
|
|
|
oparg = None; pattr = None
|
|
if op >= self.opc.HAVE_ARGUMENT:
|
|
oparg = self.get_argument(offset) + extended_arg
|
|
extended_arg = 0
|
|
if op == self.opc.EXTENDED_ARG:
|
|
extended_arg = oparg * scan.L65536
|
|
continue
|
|
if op in self.opc.hasconst:
|
|
const = co.co_consts[oparg]
|
|
if iscode(const):
|
|
oparg = const
|
|
if const.co_name == '<lambda>':
|
|
assert opname == 'LOAD_CONST'
|
|
opname = 'LOAD_LAMBDA'
|
|
elif const.co_name == '<genexpr>':
|
|
opname = 'LOAD_GENEXPR'
|
|
elif const.co_name == '<dictcomp>':
|
|
opname = 'LOAD_DICTCOMP'
|
|
elif const.co_name == '<setcomp>':
|
|
opname = 'LOAD_SETCOMP'
|
|
# verify() uses 'pattr' for comparison, since 'attr'
|
|
# now holds Code(const) and thus can not be used
|
|
# for comparison (todo: think 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 self.opc.hasname:
|
|
pattr = names[oparg]
|
|
elif op in self.opc.hasjrel:
|
|
pattr = repr(offset + 3 + oparg)
|
|
elif op in self.opc.hasjabs:
|
|
pattr = repr(oparg)
|
|
elif op in self.opc.haslocal:
|
|
pattr = varnames[oparg]
|
|
elif op in self.opc.hascompare:
|
|
pattr = self.opc.cmp_op[oparg]
|
|
elif op in self.opc.hasfree:
|
|
pattr = free[oparg]
|
|
|
|
if op in self.varargs_ops:
|
|
# CE - Hack for >= 2.5
|
|
# Now all values loaded via LOAD_CLOSURE are packed into
|
|
# a tuple before calling MAKE_CLOSURE.
|
|
if op == self.opc.BUILD_TUPLE and \
|
|
self.code[self.prev[offset]] == self.opc.LOAD_CLOSURE:
|
|
continue
|
|
else:
|
|
opname = '%s_%d' % (opname, oparg)
|
|
if op != self.opc.BUILD_SLICE:
|
|
customize[opname] = oparg
|
|
elif op == self.opc.JA:
|
|
target = self.get_target(offset)
|
|
if target < offset:
|
|
if (offset in self.stmts
|
|
and self.code[offset+3] not in (self.opc.END_FINALLY,
|
|
self.opc.POP_BLOCK)
|
|
and offset not in self.not_continue):
|
|
opname = 'CONTINUE'
|
|
else:
|
|
opname = 'JUMP_BACK'
|
|
|
|
elif op == self.opc.LOAD_GLOBAL:
|
|
if offset in self.load_asserts:
|
|
opname = 'LOAD_ASSERT'
|
|
elif op == self.opc.RETURN_VALUE:
|
|
if offset in self.return_end_ifs:
|
|
opname = 'RETURN_END_IF'
|
|
|
|
if offset in self.linestartoffsets:
|
|
linestart = self.linestartoffsets[offset]
|
|
else:
|
|
linestart = None
|
|
|
|
if offset not in replace:
|
|
tokens.append(Token(opname, oparg, pattr, offset, linestart))
|
|
else:
|
|
tokens.append(Token(replace[offset], oparg, pattr, offset, linestart))
|
|
pass
|
|
pass
|
|
|
|
if show_asm in ('both', 'after'):
|
|
for t in tokens:
|
|
print(t)
|
|
print()
|
|
return tokens, customize
|
|
|
|
def op_size(self, op):
|
|
"""
|
|
Return size of operator with its arguments
|
|
for given opcode <op>.
|
|
"""
|
|
if op < self.opc.HAVE_ARGUMENT and op not in self.opc.hasArgumentExtended:
|
|
return 1
|
|
else:
|
|
return 3
|
|
|
|
def setup_code(self, co):
|
|
"""
|
|
Creates Python-independent bytecode structure (byte array) in
|
|
self.code and records previous instruction in self.prev
|
|
The size of self.code is returned
|
|
"""
|
|
self.code = array('B', co.co_code)
|
|
|
|
n = -1
|
|
for i in self.op_range(0, len(self.code)):
|
|
if self.code[i] in (self.opc.RETURN_VALUE, self.opc.END_FINALLY):
|
|
n = i + 1
|
|
pass
|
|
pass
|
|
assert n > -1, "Didn't find RETURN_VALUE or END_FINALLY"
|
|
self.code = array('B', co.co_code[:n])
|
|
|
|
return n
|
|
|
|
def build_prev_op(self, n):
|
|
self.prev = [0]
|
|
# mapping addresses of instruction & argument
|
|
for i in self.op_range(0, n):
|
|
op = self.code[i]
|
|
self.prev.append(i)
|
|
if self.op_hasArgument(op):
|
|
self.prev.append(i)
|
|
self.prev.append(i)
|
|
pass
|
|
pass
|
|
|
|
def build_lines_data(self, co, n):
|
|
"""
|
|
Initializes self.lines and self.linesstartoffsets
|
|
"""
|
|
self.lines = []
|
|
linetuple = namedtuple('linetuple', ['l_no', 'next'])
|
|
|
|
# linestarts is a tuple of (offset, line number).
|
|
# Turn that in a has that we can index
|
|
self.linestarts = list(findlinestarts(co))
|
|
self.linestartoffsets = {}
|
|
for offset, lineno in self.linestarts:
|
|
self.linestartoffsets[offset] = lineno
|
|
|
|
j = 0
|
|
(prev_start_byte, prev_line_no) = self.linestarts[0]
|
|
for (start_byte, line_no) in self.linestarts[1:]:
|
|
while j < start_byte:
|
|
self.lines.append(linetuple(prev_line_no, start_byte))
|
|
j += 1
|
|
prev_line_no = start_byte
|
|
while j < n:
|
|
self.lines.append(linetuple(prev_line_no, n))
|
|
j+=1
|
|
return
|
|
|
|
def build_stmt_indices(self):
|
|
code = self.code
|
|
start = 0
|
|
end = len(code)
|
|
|
|
stmt_opcode_seqs = frozenset([(self.opc.PJIF, self.opc.JF),
|
|
(self.opc.PJIF, self.opc.JA),
|
|
(self.opc.PJIT, self.opc.JF),
|
|
(self.opc.PJIT, self.opc.JA)])
|
|
|
|
prelim = self.all_instr(start, end, self.stmt_opcodes)
|
|
|
|
stmts = self.stmts = set(prelim)
|
|
pass_stmts = set()
|
|
for seq in stmt_opcode_seqs:
|
|
for i in self.op_range(start, end-(len(seq)+1)):
|
|
match = True
|
|
for elem in seq:
|
|
if elem != code[i]:
|
|
match = False
|
|
break
|
|
i += self.op_size(code[i])
|
|
|
|
if match:
|
|
i = self.prev[i]
|
|
stmts.add(i)
|
|
pass_stmts.add(i)
|
|
|
|
if pass_stmts:
|
|
stmt_list = list(stmts)
|
|
stmt_list.sort()
|
|
else:
|
|
stmt_list = prelim
|
|
last_stmt = -1
|
|
self.next_stmt = []
|
|
slist = self.next_stmt = []
|
|
i = 0
|
|
for s in stmt_list:
|
|
if code[s] == self.opc.JA and s not in pass_stmts:
|
|
target = self.get_target(s)
|
|
if target > s or self.lines[last_stmt].l_no == self.lines[s].l_no:
|
|
stmts.remove(s)
|
|
continue
|
|
j = self.prev[s]
|
|
while code[j] == self.opc.JA:
|
|
j = self.prev[j]
|
|
if code[j] == self.opc.LIST_APPEND: # list comprehension
|
|
stmts.remove(s)
|
|
continue
|
|
elif code[s] == self.opc.POP_TOP and code[self.prev[s]] == self.opc.ROT_TWO:
|
|
stmts.remove(s)
|
|
continue
|
|
elif code[s] in self.designator_ops:
|
|
j = self.prev[s]
|
|
while code[j] in self.designator_ops:
|
|
j = self.prev[j]
|
|
if code[j] == self.opc.FOR_ITER:
|
|
stmts.remove(s)
|
|
continue
|
|
last_stmt = s
|
|
slist += [s] * (s-i)
|
|
i = s
|
|
slist += [end] * (end-len(slist))
|
|
|
|
def next_except_jump(self, start):
|
|
'''
|
|
Return the next jump that was generated by an except SomeException:
|
|
construct in a try...except...else clause or None if not found.
|
|
'''
|
|
|
|
if self.code[start] == self.opc.DUP_TOP:
|
|
except_match = self.first_instr(start, len(self.code), self.opc.PJIF)
|
|
if except_match:
|
|
jmp = self.prev[self.get_target(except_match)]
|
|
|
|
# In Python <= 2.6 we may have jumps to jumps
|
|
if self.version <= 2.6 and self.code[jmp] in self.jump_forward:
|
|
self.not_continue.add(jmp)
|
|
jmp = self.get_target(jmp)
|
|
if jmp not in self.pop_jump_if | self.jump_forward:
|
|
self.ignore_if.add(except_match)
|
|
return None
|
|
|
|
self.ignore_if.add(except_match)
|
|
self.not_continue.add(jmp)
|
|
return jmp
|
|
|
|
count_END_FINALLY = 0
|
|
count_SETUP_ = 0
|
|
for i in self.op_range(start, len(self.code)):
|
|
op = self.code[i]
|
|
if op == self.opc.END_FINALLY:
|
|
if count_END_FINALLY == count_SETUP_:
|
|
if self.version == 2.7:
|
|
assert self.code[self.prev[i]] in \
|
|
self.jump_forward | frozenset([self.opc.RETURN_VALUE])
|
|
self.not_continue.add(self.prev[i])
|
|
return self.prev[i]
|
|
count_END_FINALLY += 1
|
|
elif op in self.setup_ops:
|
|
count_SETUP_ += 1
|
|
|
|
def detect_structure(self, pos, op=None):
|
|
'''
|
|
Detect type of block structures and their boundaries to fix optimized jumps
|
|
in python2.3+
|
|
'''
|
|
|
|
# TODO: check the struct boundaries more precisely -Dan
|
|
|
|
code = self.code
|
|
# Ev remove this test and make op a mandatory argument -Dan
|
|
if op is None:
|
|
op = code[pos]
|
|
|
|
# Detect parent structure
|
|
parent = self.structs[0]
|
|
start = parent['start']
|
|
end = parent['end']
|
|
for s in self.structs:
|
|
_start = s['start']
|
|
_end = s['end']
|
|
if (_start <= pos < _end) and (_start >= start and _end <= end):
|
|
start = _start
|
|
end = _end
|
|
parent = s
|
|
|
|
if op == self.opc.SETUP_LOOP:
|
|
|
|
# We categorize loop types: 'for', 'while', 'while 1' with
|
|
# possibly suffices '-loop' and '-else'
|
|
# Try to find the jump_back instruction of the loop.
|
|
# It could be a return instruction.
|
|
|
|
start = pos+3
|
|
target = self.get_target(pos, op)
|
|
end = self.restrict_to_parent(target, parent)
|
|
|
|
if target != end:
|
|
self.fixed_jumps[pos] = end
|
|
|
|
(line_no, next_line_byte) = self.lines[pos]
|
|
jump_back = self.last_instr(start, end, self.opc.JA,
|
|
next_line_byte, False)
|
|
|
|
if jump_back:
|
|
# Account for the fact that < 2.7 has an explicit
|
|
# POP_TOP instruction in the equivalate POP_JUMP_IF
|
|
# construct
|
|
if self.version < 2.7:
|
|
jump_forward_offset = jump_back+4
|
|
return_val_offset1 = self.prev[self.prev[self.prev[end]]]
|
|
# Is jump back really "back"?
|
|
jump_target = self.get_target(jump_back, code[jump_back])
|
|
if (jump_target > jump_back or
|
|
code[jump_back+3] in [self.opc.JUMP_FORWARD, self.opc.JUMP_ABSOLUTE]):
|
|
jump_back = None
|
|
pass
|
|
else:
|
|
jump_forward_offset = jump_back+3
|
|
return_val_offset1 = self.prev[self.prev[end]]
|
|
|
|
if (jump_back and jump_back != self.prev[end]
|
|
and code[jump_forward_offset] in self.jump_forward):
|
|
if (code[self.prev[end]] == self.opc.RETURN_VALUE or
|
|
(code[self.prev[end]] == self.opc.POP_BLOCK
|
|
and code[return_val_offset1] == self.opc.RETURN_VALUE)):
|
|
jump_back = None
|
|
if not jump_back:
|
|
# loop suite ends in return
|
|
# scanner26 of wbiti had:
|
|
# jump_back = self.last_instr(start, end, self.opc.JA, start, False)
|
|
jump_back = self.last_instr(start, end, self.opc.RETURN_VALUE)
|
|
if not jump_back:
|
|
return
|
|
jump_back += 1
|
|
|
|
if_offset = None
|
|
if self.version < 2.7:
|
|
# Look for JUMP_IF POP_TOP ...
|
|
if (code[self.prev[next_line_byte]] == self.opc.POP_TOP
|
|
and (code[self.prev[self.prev[next_line_byte]]]
|
|
in self.pop_jump_if)):
|
|
if_offset = self.prev[self.prev[next_line_byte]]
|
|
elif code[self.prev[next_line_byte]] in self.pop_jump_if:
|
|
# Look for POP_JUMP_IF ...
|
|
if_offset = self.prev[next_line_byte]
|
|
if if_offset:
|
|
loop_type = 'while'
|
|
self.ignore_if.add(if_offset)
|
|
if self.version < 2.7 and (
|
|
code[self.prev[jump_back]] == self.opc.RETURN_VALUE):
|
|
self.ignore_if.add(self.prev[jump_back])
|
|
pass
|
|
pass
|
|
else:
|
|
loop_type = 'for'
|
|
target = next_line_byte
|
|
end = jump_back + 3
|
|
else:
|
|
if self.get_target(jump_back) >= next_line_byte:
|
|
jump_back = self.last_instr(start, end, self.opc.JA, start, False)
|
|
if end > jump_back+4 and code[end] in self.jump_forward:
|
|
if code[jump_back+4] in self.jump_forward:
|
|
if self.get_target(jump_back+4) == self.get_target(end):
|
|
self.fixed_jumps[pos] = jump_back+4
|
|
end = jump_back+4
|
|
elif target < pos:
|
|
self.fixed_jumps[pos] = jump_back+4
|
|
end = jump_back+4
|
|
|
|
target = self.get_target(jump_back, self.opc.JA)
|
|
|
|
if code[target] in (self.opc.FOR_ITER, self.opc.GET_ITER):
|
|
loop_type = 'for'
|
|
else:
|
|
loop_type = 'while'
|
|
if (self.version < 2.7
|
|
and self.code[self.prev[next_line_byte]] == self.opc.POP_TOP):
|
|
test = self.prev[self.prev[next_line_byte]]
|
|
else:
|
|
test = self.prev[next_line_byte]
|
|
|
|
if test == pos:
|
|
loop_type = 'while 1'
|
|
elif self.code[test] in self.opc.hasjabs + self.opc.hasjrel:
|
|
self.ignore_if.add(test)
|
|
test_target = self.get_target(test)
|
|
if test_target > (jump_back+3):
|
|
jump_back = test_target
|
|
self.not_continue.add(jump_back)
|
|
self.loops.append(target)
|
|
self.structs.append({'type': loop_type + '-loop',
|
|
'start': target,
|
|
'end': jump_back})
|
|
if jump_back+3 != end:
|
|
self.structs.append({'type': loop_type + '-else',
|
|
'start': jump_back+3,
|
|
'end': end})
|
|
elif op == self.opc.SETUP_EXCEPT:
|
|
start = pos+3
|
|
target = self.get_target(pos, op)
|
|
end = self.restrict_to_parent(target, parent)
|
|
if target != end:
|
|
self.fixed_jumps[pos] = end
|
|
# print target, end, parent
|
|
# Add the try block
|
|
self.structs.append({'type': 'try',
|
|
'start': start,
|
|
'end': end-4})
|
|
# Now isolate the except and else blocks
|
|
end_else = start_else = self.get_target(self.prev[end])
|
|
|
|
# Add the except blocks
|
|
i = end
|
|
while i < len(self.code) and self.code[i] != self.opc.END_FINALLY:
|
|
jmp = self.next_except_jump(i)
|
|
if jmp is None: # check
|
|
i = self.next_stmt[i]
|
|
continue
|
|
if self.code[jmp] == self.opc.RETURN_VALUE:
|
|
self.structs.append({'type': 'except',
|
|
'start': i,
|
|
'end': jmp+1})
|
|
i = jmp + 1
|
|
else:
|
|
target = self.get_target(jmp)
|
|
if target != start_else:
|
|
end_else = self.get_target(jmp)
|
|
if self.code[jmp] == self.opc.JF:
|
|
if self.version <= 2.6:
|
|
self.fixed_jumps[jmp] = target
|
|
else:
|
|
self.fixed_jumps[jmp] = -1
|
|
self.structs.append({'type': 'except',
|
|
'start': i,
|
|
'end': jmp})
|
|
i = jmp + 3
|
|
|
|
# Add the try-else block
|
|
if end_else != start_else:
|
|
r_end_else = self.restrict_to_parent(end_else, parent)
|
|
# May be able to drop the 2.7 test.
|
|
if self.version == 2.7:
|
|
self.structs.append({'type': 'try-else',
|
|
'start': i+1,
|
|
'end': r_end_else})
|
|
self.fixed_jumps[i] = r_end_else
|
|
else:
|
|
self.fixed_jumps[i] = i+1
|
|
|
|
elif op in self.pop_jump_if:
|
|
start = pos+3
|
|
target = self.get_target(pos, op)
|
|
rtarget = self.restrict_to_parent(target, parent)
|
|
pre = self.prev
|
|
|
|
# Do not let jump to go out of parent struct bounds
|
|
if target != rtarget and parent['type'] == 'and/or':
|
|
self.fixed_jumps[pos] = rtarget
|
|
return
|
|
|
|
# Does this jump to right after another conditional jump that is
|
|
# not myself? If so, it's part of a larger conditional.
|
|
# rocky: if we have a conditional jump to the next instruction, then
|
|
# possibly I am "skipping over" a "pass" or null statement.
|
|
|
|
if self.version < 2.7:
|
|
op_testset = set([self.opc.POP_TOP,
|
|
self.opc.JUMP_IF_TRUE, self.opc.JUMP_IF_FALSE])
|
|
else:
|
|
op_testset = self.pop_jump_if_or_pop | self.pop_jump_if
|
|
|
|
if ( code[pre[target]] in op_testset
|
|
and (target > pos) ):
|
|
self.fixed_jumps[pos] = pre[target]
|
|
self.structs.append({'type': 'and/or',
|
|
'start': start,
|
|
'end': pre[target]})
|
|
return
|
|
|
|
# Is it an "and" inside an "if" block
|
|
if op == self.opc.PJIF:
|
|
# Search for other POP_JUMP_IF_FALSE targetting the same op,
|
|
# in current statement, starting from current offset, and filter
|
|
# everything inside inner 'or' jumps and midline ifs
|
|
match = self.rem_or(start, self.next_stmt[pos], self.opc.PJIF, target)
|
|
## We can't remove mid-line ifs because line structures have changed
|
|
## from restructBytecode().
|
|
## match = self.remove_mid_line_ifs(match)
|
|
|
|
# If we still have any offsets in set, start working on it
|
|
if match:
|
|
if code[pre[rtarget]] in self.jump_forward \
|
|
and pre[rtarget] not in self.stmts \
|
|
and self.restrict_to_parent(self.get_target(pre[rtarget]), parent) == rtarget:
|
|
if code[pre[pre[rtarget]]] == self.opc.JA \
|
|
and self.remove_mid_line_ifs([pos]) \
|
|
and target == self.get_target(pre[pre[rtarget]]) \
|
|
and (pre[pre[rtarget]] not in self.stmts or self.get_target(pre[pre[rtarget]]) > pre[pre[rtarget]])\
|
|
and 1 == len(self.remove_mid_line_ifs(self.rem_or(start, pre[pre[rtarget]], self.pop_jump_if, target))):
|
|
pass
|
|
elif code[pre[pre[rtarget]]] == self.opc.RETURN_VALUE \
|
|
and self.remove_mid_line_ifs([pos]) \
|
|
and 1 == (len(set(self.remove_mid_line_ifs(self.rem_or(start,
|
|
pre[pre[rtarget]],
|
|
self.pop_jump_if, target)))
|
|
| set(self.remove_mid_line_ifs(self.rem_or(start, pre[pre[rtarget]],
|
|
(self.opc.PJIF, self.opc.PJIT, self.opc.JA), pre[rtarget], True))))):
|
|
pass
|
|
else:
|
|
fix = None
|
|
jump_ifs = self.all_instr(start, self.next_stmt[pos], self.opc.PJIF)
|
|
last_jump_good = True
|
|
for j in jump_ifs:
|
|
if target == self.get_target(j):
|
|
if self.lines[j].next == j+3 and last_jump_good:
|
|
fix = j
|
|
break
|
|
else:
|
|
last_jump_good = False
|
|
self.fixed_jumps[pos] = fix or match[-1]
|
|
return
|
|
else:
|
|
self.fixed_jumps[pos] = match[-1]
|
|
return
|
|
else: # op == self.opc.PJIT
|
|
if self.version < 2.7 and code[pos+3] == self.opc.POP_TOP:
|
|
assert_pos = pos + 4
|
|
else:
|
|
assert_pos = pos + 3
|
|
if (assert_pos) in self.load_asserts:
|
|
if code[pre[rtarget]] == self.opc.RAISE_VARARGS:
|
|
return
|
|
self.load_asserts.remove(assert_pos)
|
|
|
|
next = self.next_stmt[pos]
|
|
if pre[next] == pos:
|
|
pass
|
|
elif code[next] in self.jump_forward and target == self.get_target(next):
|
|
if code[pre[next]] == self.opc.PJIF:
|
|
if code[next] == self.opc.JF or target != rtarget or code[pre[pre[rtarget]]] not in (self.opc.JA, self.opc.RETURN_VALUE):
|
|
self.fixed_jumps[pos] = pre[next]
|
|
return
|
|
elif code[next] == self.opc.JA and code[target] in self.jump_forward:
|
|
next_target = self.get_target(next)
|
|
if self.get_target(target) == next_target:
|
|
self.fixed_jumps[pos] = pre[next]
|
|
return
|
|
elif code[next_target] in self.jump_forward and self.get_target(next_target) == self.get_target(target):
|
|
self.fixed_jumps[pos] = pre[next]
|
|
return
|
|
|
|
# don't add a struct for a while test, it's already taken care of
|
|
if pos in self.ignore_if:
|
|
return
|
|
|
|
if code[pre[rtarget]] == self.opc.JA and pre[rtarget] in self.stmts \
|
|
and pre[rtarget] != pos and pre[pre[rtarget]] != pos:
|
|
if code[rtarget] == self.opc.JA and code[rtarget+3] == self.opc.POP_BLOCK:
|
|
if code[pre[pre[rtarget]]] != self.opc.JA:
|
|
pass
|
|
elif self.get_target(pre[pre[rtarget]]) != target:
|
|
pass
|
|
else:
|
|
rtarget = pre[rtarget]
|
|
else:
|
|
rtarget = pre[rtarget]
|
|
|
|
# Does the "if" jump just beyond a jump op, then this is probably an if statement
|
|
pre_rtarget = pre[rtarget]
|
|
code_pre_rtarget = code[pre_rtarget]
|
|
if code_pre_rtarget in self.jump_forward:
|
|
if_end = self.get_target(pre_rtarget)
|
|
|
|
# Is this a loop and not an "if" statment?
|
|
if (if_end < pre_rtarget) and (code[pre[if_end]] == self.opc.SETUP_LOOP):
|
|
if(if_end > start):
|
|
return
|
|
|
|
end = self.restrict_to_parent(if_end, parent)
|
|
|
|
self.structs.append({'type': 'if-then',
|
|
'start': start,
|
|
'end': pre_rtarget})
|
|
self.not_continue.add(pre_rtarget)
|
|
|
|
if rtarget < end:
|
|
self.structs.append({'type': 'if-else',
|
|
'start': rtarget,
|
|
'end': end})
|
|
elif code_pre_rtarget == self.opc.RETURN_VALUE:
|
|
if self.version == 2.7 or pre_rtarget not in self.ignore_if:
|
|
self.structs.append({'type': 'if-then',
|
|
'start': start,
|
|
'end': rtarget})
|
|
if self.version == 2.7 or code[pre_rtarget+1] != self.opc.JUMP_FORWARD:
|
|
self.return_end_ifs.add(pre_rtarget)
|
|
|
|
elif op in self.pop_jump_if_or_pop:
|
|
target = self.get_target(pos, op)
|
|
self.fixed_jumps[pos] = self.restrict_to_parent(target, parent)
|
|
|
|
def find_jump_targets(self):
|
|
'''
|
|
Detect all offsets in a byte code which are jump targets.
|
|
|
|
Return the list of offsets.
|
|
|
|
This procedure is modelled after dis.findlabels(), but here
|
|
for each target the number of jumps are counted.
|
|
'''
|
|
|
|
n = len(self.code)
|
|
self.structs = [{'type': 'root',
|
|
'start': 0,
|
|
'end': n-1}]
|
|
self.loops = [] # All loop entry points
|
|
self.fixed_jumps = {} # Map fixed jumps to their real destination
|
|
self.ignore_if = set()
|
|
self.build_stmt_indices()
|
|
|
|
# Containers filled by detect_structure()
|
|
self.not_continue = set()
|
|
self.return_end_ifs = set()
|
|
|
|
targets = {}
|
|
for i in self.op_range(0, n):
|
|
op = self.code[i]
|
|
|
|
# Determine structures and fix jumps in Python versions
|
|
# since 2.3
|
|
self.detect_structure(i, op)
|
|
|
|
if op >= self.opc.HAVE_ARGUMENT:
|
|
label = self.fixed_jumps.get(i)
|
|
oparg = self.get_argument(i)
|
|
if label is None:
|
|
if op in self.opc.hasjrel and op != self.opc.FOR_ITER:
|
|
label = i + 3 + oparg
|
|
elif self.version == 2.7 and op in self.opc.hasjabs:
|
|
if op in (self.opc.JUMP_IF_FALSE_OR_POP,
|
|
self.opc.JUMP_IF_TRUE_OR_POP):
|
|
if (oparg > i):
|
|
label = oparg
|
|
|
|
if label is not None and label != -1:
|
|
targets[label] = targets.get(label, []) + [i]
|
|
elif op == self.opc.END_FINALLY and i in self.fixed_jumps:
|
|
label = self.fixed_jumps[i]
|
|
targets[label] = targets.get(label, []) + [i]
|
|
return targets
|
|
|
|
if __name__ == "__main__":
|
|
from uncompyle6 import PYTHON_VERSION
|
|
if PYTHON_VERSION >= 2.3:
|
|
co = inspect.currentframe().f_code
|
|
from uncompyle6 import PYTHON_VERSION
|
|
tokens, customize = Scanner2(PYTHON_VERSION).disassemble(co)
|
|
for t in tokens:
|
|
print(t.format())
|
|
else:
|
|
print("Need to be Python 3.2 or greater to demo; I am %s." %
|
|
PYTHON_VERSION)
|
|
pass
|