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115 lines
4.3 KiB
Python
Executable File
115 lines
4.3 KiB
Python
Executable File
# Copyright (c) 2015, 2016 by Rocky Bernstein
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"""
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Python 2.7 bytecode ingester.
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This massages tokenized 2.7 bytecode to make it more amenable for
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grammar parsing.
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"""
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from __future__ import print_function
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from uncompyle6.scanners.scanner2 import Scanner2
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from uncompyle6 import PYTHON3
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if PYTHON3:
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import sys
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intern = sys.intern
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# bytecode verification, verify(), uses JUMP_OPs from here
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from xdis.opcodes import opcode_27
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JUMP_OPs = opcode_27.JUMP_OPs
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class Scanner27(Scanner2):
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def __init__(self, show_asm=False, is_pypy=False):
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super(Scanner27, self).__init__(2.7, show_asm, is_pypy)
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# opcodes that start statements
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self.stmt_opcodes = frozenset([
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self.opc.SETUP_LOOP, self.opc.BREAK_LOOP,
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self.opc.SETUP_FINALLY, self.opc.END_FINALLY,
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self.opc.SETUP_EXCEPT,
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self.opc.POP_BLOCK, self.opc.STORE_FAST, self.opc.DELETE_FAST,
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self.opc.STORE_DEREF, self.opc.STORE_GLOBAL,
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self.opc.DELETE_GLOBAL, self.opc.STORE_NAME,
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self.opc.DELETE_NAME, self.opc.STORE_ATTR,
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self.opc.DELETE_ATTR, self.opc.STORE_SUBSCR,
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self.opc.DELETE_SUBSCR, self.opc.RETURN_VALUE,
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self.opc.RAISE_VARARGS, self.opc.POP_TOP,
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self.opc.PRINT_EXPR, self.opc.PRINT_ITEM,
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self.opc.PRINT_NEWLINE, self.opc.PRINT_ITEM_TO,
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self.opc.PRINT_NEWLINE_TO, self.opc.CONTINUE_LOOP,
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self.opc.JUMP_ABSOLUTE, self.opc.EXEC_STMT,
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# New in 2.7
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self.opc.SETUP_WITH,
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self.opc.STORE_SLICE_0, self.opc.STORE_SLICE_1,
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self.opc.STORE_SLICE_2, self.opc.STORE_SLICE_3,
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self.opc.DELETE_SLICE_0, self.opc.DELETE_SLICE_1,
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self.opc.DELETE_SLICE_2, self.opc.DELETE_SLICE_3,
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])
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# opcodes with expect a variable number pushed values whose
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# count is in the opcode. For parsing we generally change the
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# opcode name to include that number.
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varargs_ops = set([
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self.opc.BUILD_LIST, self.opc.BUILD_TUPLE,
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self.opc.BUILD_SLICE, self.opc.UNPACK_SEQUENCE,
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self.opc.MAKE_FUNCTION, self.opc.CALL_FUNCTION,
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self.opc.MAKE_CLOSURE, self.opc.CALL_FUNCTION_VAR,
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self.opc.CALL_FUNCTION_KW, self.opc.CALL_FUNCTION_VAR_KW,
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self.opc.DUP_TOPX, self.opc.RAISE_VARARGS,
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# New in Python 2.7
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self.opc.BUILD_SET, self.opc.BUILD_MAP])
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if is_pypy:
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varargs_ops.add(self.opc.CALL_METHOD)
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self.varargs_ops = frozenset(varargs_ops)
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# "setup" opcodes
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self.setup_ops = frozenset([
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self.opc.SETUP_EXCEPT, self.opc.SETUP_FINALLY,
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# New in 2.7
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self.opc.SETUP_WITH])
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# opcodes that store values into a variable
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self.designator_ops = frozenset([
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self.opc.STORE_FAST, self.opc.STORE_NAME,
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self.opc.STORE_GLOBAL, self.opc.STORE_DEREF, self.opc.STORE_ATTR,
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self.opc.STORE_SLICE_0, self.opc.STORE_SLICE_1, self.opc.STORE_SLICE_2,
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self.opc.STORE_SLICE_3, self.opc.STORE_SUBSCR, self.opc.UNPACK_SEQUENCE,
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self.opc.JUMP_ABSOLUTE
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])
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self.pop_jump_if_or_pop = frozenset([self.opc.JUMP_IF_FALSE_OR_POP,
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self.opc.JUMP_IF_TRUE_OR_POP])
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return
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def patch_continue(self, tokens, offset, op):
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if op in (self.opc.JUMP_FORWARD, self.opc.JUMP_ABSOLUTE):
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# FIXME: this is a hack to catch stuff like:
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# for ...
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# try: ...
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# except: continue
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# the "continue" is not on a new line.
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n = len(tokens)
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if (n > 2 and
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tokens[-1].type == 'JUMP_BACK' and
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self.code[offset+3] == self.opc.END_FINALLY):
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tokens[-1].type = intern('CONTINUE')
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pass
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if __name__ == "__main__":
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from uncompyle6 import PYTHON_VERSION
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if PYTHON_VERSION == 2.7:
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import inspect
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co = inspect.currentframe().f_code
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tokens, customize = Scanner27().ingest(co)
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for t in tokens:
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print(t)
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pass
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else:
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print("Need to be Python 2.7 to demo; I am %s." %
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PYTHON_VERSION)
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