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c6ddefcef5
This rebases 3.7, 3.8 ...decompilation off of 3.7ish rather than a 3.4 base. Add more 3.7 and 3.8 tests
91 lines
3.2 KiB
Python
91 lines
3.2 KiB
Python
# Copyright (c) 2019 by Rocky Bernstein
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Python 3.8 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 3.8 and calls a generalized
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scanner routine for Python 3.
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"""
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from uncompyle6.scanners.scanner37 import Scanner37
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from uncompyle6.scanners.scanner37base import Scanner37Base
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# bytecode verification, verify(), uses JUMP_OPs from here
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from xdis.opcodes import opcode_38 as opc
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# bytecode verification, verify(), uses JUMP_OPS from here
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JUMP_OPs = opc.JUMP_OPS
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class Scanner38(Scanner37):
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def __init__(self, show_asm=None):
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Scanner37Base.__init__(self, 3.8, show_asm)
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return
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pass
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def ingest(self, co, classname=None, code_objects={}, show_asm=None):
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tokens, customize = super(Scanner38, self).ingest(
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co, classname, code_objects, show_asm
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)
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for i, token in enumerate(tokens):
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opname = token.kind
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if opname in ("JUMP_FORWARD", "JUMP_ABSOLUTE"):
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# Turn JUMPs into BREAK_LOOP
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jump_target = token.attr
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if opname == "JUMP_ABSOLUTE" and token.offset >= jump_target:
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# Not a forward jump, so continue
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# FIXME: Do we need "continue" detection?
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continue
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if i + 1 < len(tokens) and tokens[i + 1] == "JUMP_BACK":
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# Sometimes the jump back is *after* the break...
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jump_back_index = i + 1
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else:
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# and sometimes it is *before* where we jumped to.
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jump_back_index = self.offset2tok_index[jump_target] - 1
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while tokens[jump_back_index].kind.startswith("COME_FROM_"):
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jump_back_index -= 1
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pass
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pass
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jump_back_token = tokens[jump_back_index]
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if (
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jump_back_token == "JUMP_BACK"
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and jump_back_token.attr < token.offset
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):
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token.kind = "BREAK_LOOP"
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pass
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pass
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return tokens, customize
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if __name__ == "__main__":
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from decompyle3 import PYTHON_VERSION
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if PYTHON_VERSION == 3.8:
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import inspect
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co = inspect.currentframe().f_code
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tokens, customize = Scanner38().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 3.8 to demo; I am %s." %
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PYTHON_VERSION)
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