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83 lines
3.4 KiB
Python
83 lines
3.4 KiB
Python
# Copyright (c) 2016-2018, 2021-2022 by Rocky Bernstein
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"""
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Python 3.6 bytecode decompiler scanner
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Does some additional massaging of xdis-disassembled instructions to
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make things easier for decompilation.
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This sets up opcodes Python's 3.6 and calls a generalized
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scanner routine for Python 3.
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"""
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from __future__ import print_function
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from uncompyle6.scanners.scanner3 import Scanner3
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# bytecode verification, verify(), uses JUMP_OPS from here
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from xdis.opcodes import opcode_36 as opc
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JUMP_OPS = opc.JUMP_OPS
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class Scanner36(Scanner3):
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def __init__(self, show_asm=None, is_pypy=False):
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Scanner3.__init__(self, (3, 6), show_asm, is_pypy)
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return
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def ingest(self, co, classname=None, code_objects={}, show_asm=None):
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"""
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Create "tokens" the bytecode of an Python code object. Largely these
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are the opcode name, but in some cases that has been modified to make parsing
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easier.
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returning a list of uncompyle6 Token's.
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Some transformations are made to assist the deparsing grammar:
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- various types of LOAD_CONST's are categorized in terms of what they load
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- COME_FROM instructions are added to assist parsing control structures
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- operands with stack argument counts or flag masks are appended to the opcode name, e.g.:
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* BUILD_LIST, BUILD_SET
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* MAKE_FUNCTION and FUNCTION_CALLS append the number of positional arguments
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- EXTENDED_ARGS instructions are removed
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Also, when we encounter certain tokens, we add them to a set which will cause custom
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grammar rules. Specifically, variable arg tokens like MAKE_FUNCTION or BUILD_LIST
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cause specific rules for the specific number of arguments they take.
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"""
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tokens, customize = Scanner3.ingest(self, co, classname, code_objects, show_asm)
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not_pypy36 = not (self.version[:2] == (3, 6) and self.is_pypy)
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for t in tokens:
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# The lowest bit of flags indicates whether the
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# var-keyword argument is placed at the top of the stack
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if ( not_pypy36 and
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t.op == self.opc.CALL_FUNCTION_EX and t.attr & 1):
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t.kind = 'CALL_FUNCTION_EX_KW'
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pass
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elif t.op == self.opc.BUILD_STRING:
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t.kind = 'BUILD_STRING_%s' % t.attr
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elif t.op == self.opc.CALL_FUNCTION_KW:
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t.kind = 'CALL_FUNCTION_KW_%s' % t.attr
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elif t.op == self.opc.FORMAT_VALUE:
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if (t.attr & 0x4):
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t.kind = 'FORMAT_VALUE_ATTR'
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pass
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elif ( not_pypy36 and
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t.op == self.opc.BUILD_MAP_UNPACK_WITH_CALL ):
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t.kind = 'BUILD_MAP_UNPACK_WITH_CALL_%d' % t.attr
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elif ( not_pypy36 and t.op == self.opc.BUILD_TUPLE_UNPACK_WITH_CALL ):
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t.kind = 'BUILD_TUPLE_UNPACK_WITH_CALL_%d' % t.attr
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pass
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return tokens, customize
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if __name__ == "__main__":
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from xdis.version_info import PYTHON_VERSION_TRIPLE, version_tuple_to_str
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if PYTHON_VERSION_TRIPLE[:2] == (3, 6):
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import inspect
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co = inspect.currentframe().f_code # type: ignore
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tokens, customize = Scanner36().ingest(co)
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for t in tokens:
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print(t.format())
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pass
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else:
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print("Need to be Python 3.6 to demo; I am version %s" % version_tuple_to_str())
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