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1153 lines
39 KiB
1153 lines
39 KiB
2 years ago
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"""
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MIT License
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Copyright (c) 2021 Alex Hall
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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"""
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import __future__
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import ast
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import dis
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import functools
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import inspect
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import io
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import linecache
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import re
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import sys
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import types
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from collections import defaultdict, namedtuple
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from copy import deepcopy
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from itertools import islice
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from operator import attrgetter
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from threading import RLock
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function_node_types = (ast.FunctionDef,)
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PY3 = sys.version_info[0] == 3
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if PY3:
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# noinspection PyUnresolvedReferences
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from functools import lru_cache
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# noinspection PyUnresolvedReferences
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from tokenize import detect_encoding
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from itertools import zip_longest
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# noinspection PyUnresolvedReferences,PyCompatibility
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from pathlib import Path
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cache = lru_cache(maxsize=None)
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text_type = str
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else:
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from lib2to3.pgen2.tokenize import detect_encoding, cookie_re as encoding_pattern
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from itertools import izip_longest as zip_longest
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class Path(object):
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pass
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def cache(func):
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d = {}
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@functools.wraps(func)
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def wrapper(*args):
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if args in d:
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return d[args]
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result = d[args] = func(*args)
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return result
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return wrapper
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# noinspection PyUnresolvedReferences
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text_type = unicode
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try:
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# noinspection PyUnresolvedReferences
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_get_instructions = dis.get_instructions
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except AttributeError:
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class Instruction(namedtuple('Instruction', 'offset argval opname starts_line')):
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lineno = None
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from dis import HAVE_ARGUMENT, EXTENDED_ARG, hasconst, opname, findlinestarts, hasname
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# Based on dis.disassemble from 2.7
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# Left as similar as possible for easy diff
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def _get_instructions(co):
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code = co.co_code
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linestarts = dict(findlinestarts(co))
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n = len(code)
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i = 0
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extended_arg = 0
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while i < n:
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offset = i
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c = code[i]
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op = ord(c)
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lineno = linestarts.get(i)
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argval = None
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i = i + 1
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if op >= HAVE_ARGUMENT:
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oparg = ord(code[i]) + ord(code[i + 1]) * 256 + extended_arg
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extended_arg = 0
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i = i + 2
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if op == EXTENDED_ARG:
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extended_arg = oparg * 65536
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if op in hasconst:
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argval = co.co_consts[oparg]
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elif op in hasname:
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argval = co.co_names[oparg]
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elif opname[op] == 'LOAD_FAST':
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argval = co.co_varnames[oparg]
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yield Instruction(offset, argval, opname[op], lineno)
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try:
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function_node_types += (ast.AsyncFunctionDef,)
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except AttributeError:
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pass
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def assert_(condition, message=""):
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"""
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Like an assert statement, but unaffected by -O
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:param condition: value that is expected to be truthy
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:type message: Any
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"""
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if not condition:
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raise AssertionError(str(message))
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def get_instructions(co):
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lineno = co.co_firstlineno
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for inst in _get_instructions(co):
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lineno = inst.starts_line or lineno
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assert_(lineno)
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inst.lineno = lineno
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yield inst
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TESTING = 0
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class NotOneValueFound(Exception):
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pass
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def only(it):
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if hasattr(it, '__len__'):
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if len(it) != 1:
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raise NotOneValueFound('Expected one value, found %s' % len(it))
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# noinspection PyTypeChecker
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return list(it)[0]
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lst = tuple(islice(it, 2))
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if len(lst) == 0:
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raise NotOneValueFound('Expected one value, found 0')
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if len(lst) > 1:
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raise NotOneValueFound('Expected one value, found several')
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return lst[0]
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class Source(object):
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"""
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The source code of a single file and associated metadata.
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The main method of interest is the classmethod `executing(frame)`.
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If you want an instance of this class, don't construct it.
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Ideally use the classmethod `for_frame(frame)`.
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If you don't have a frame, use `for_filename(filename [, module_globals])`.
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These methods cache instances by filename, so at most one instance exists per filename.
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Attributes:
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- filename
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- text
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- lines
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- tree: AST parsed from text, or None if text is not valid Python
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All nodes in the tree have an extra `parent` attribute
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Other methods of interest:
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- statements_at_line
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- asttokens
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- code_qualname
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"""
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def __init__(self, filename, lines):
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"""
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Don't call this constructor, see the class docstring.
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"""
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self.filename = filename
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text = ''.join(lines)
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if not isinstance(text, text_type):
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encoding = self.detect_encoding(text)
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# noinspection PyUnresolvedReferences
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text = text.decode(encoding)
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lines = [line.decode(encoding) for line in lines]
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self.text = text
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self.lines = [line.rstrip('\r\n') for line in lines]
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if PY3:
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ast_text = text
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else:
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# In python 2 it's a syntax error to parse unicode
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# with an encoding declaration, so we remove it but
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# leave empty lines in its place to keep line numbers the same
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ast_text = ''.join([
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'\n' if i < 2 and encoding_pattern.match(line)
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else line
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for i, line in enumerate(lines)
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])
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self._nodes_by_line = defaultdict(list)
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self.tree = None
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self._qualnames = {}
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try:
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self.tree = ast.parse(ast_text, filename=filename)
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except SyntaxError:
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pass
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else:
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for node in ast.walk(self.tree):
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for child in ast.iter_child_nodes(node):
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child.parent = node
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for lineno in node_linenos(node):
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self._nodes_by_line[lineno].append(node)
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visitor = QualnameVisitor()
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visitor.visit(self.tree)
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self._qualnames = visitor.qualnames
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@classmethod
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def for_frame(cls, frame, use_cache=True):
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"""
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Returns the `Source` object corresponding to the file the frame is executing in.
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"""
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return cls.for_filename(frame.f_code.co_filename, frame.f_globals or {}, use_cache)
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@classmethod
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def for_filename(cls, filename, module_globals=None, use_cache=True):
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if isinstance(filename, Path):
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filename = str(filename)
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source_cache = cls._class_local('__source_cache', {})
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if use_cache:
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try:
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return source_cache[filename]
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except KeyError:
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pass
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if not use_cache:
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linecache.checkcache(filename)
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lines = tuple(linecache.getlines(filename, module_globals))
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result = source_cache[filename] = cls._for_filename_and_lines(filename, lines)
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return result
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|
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||
|
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@classmethod
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def _for_filename_and_lines(cls, filename, lines):
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source_cache = cls._class_local('__source_cache_with_lines', {})
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try:
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return source_cache[(filename, lines)]
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except KeyError:
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pass
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|
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result = source_cache[(filename, lines)] = cls(filename, lines)
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return result
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|
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|
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@classmethod
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def lazycache(cls, frame):
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if hasattr(linecache, 'lazycache'):
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linecache.lazycache(frame.f_code.co_filename, frame.f_globals)
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@classmethod
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def executing(cls, frame_or_tb):
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"""
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Returns an `Executing` object representing the operation
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|
currently executing in the given frame or traceback object.
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||
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"""
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||
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|
if isinstance(frame_or_tb, types.TracebackType):
|
||
|
|
# https://docs.python.org/3/reference/datamodel.html#traceback-objects
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|
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# "tb_lineno gives the line number where the exception occurred;
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# tb_lasti indicates the precise instruction.
|
||
|
|
# The line number and last instruction in the traceback may differ
|
||
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# from the line number of its frame object
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# if the exception occurred in a try statement with no matching except clause
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# or with a finally clause."
|
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tb = frame_or_tb
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frame = tb.tb_frame
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lineno = tb.tb_lineno
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lasti = tb.tb_lasti
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else:
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frame = frame_or_tb
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lineno = frame.f_lineno
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lasti = frame.f_lasti
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|
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code = frame.f_code
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key = (code, id(code), lasti)
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executing_cache = cls._class_local('__executing_cache', {})
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try:
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args = executing_cache[key]
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|
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except KeyError:
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|
|
def find(source, retry_cache):
|
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|
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node = stmts = decorator = None
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tree = source.tree
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|
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if tree:
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try:
|
||
|
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stmts = source.statements_at_line(lineno)
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|
|
if stmts:
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||
|
|
if is_ipython_cell_code(code):
|
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|
|
for stmt in stmts:
|
||
|
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tree = _extract_ipython_statement(stmt)
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||
|
|
try:
|
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|
|
node_finder = NodeFinder(frame, stmts, tree, lasti)
|
||
|
|
if (node or decorator) and (node_finder.result or node_finder.decorator):
|
||
|
|
if retry_cache:
|
||
|
|
raise AssertionError
|
||
|
|
# Found potential nodes in separate statements,
|
||
|
|
# cannot resolve ambiguity, give up here
|
||
|
|
node = decorator = None
|
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|
break
|
||
|
|
|
||
|
|
node = node_finder.result
|
||
|
|
decorator = node_finder.decorator
|
||
|
|
except Exception:
|
||
|
|
if retry_cache:
|
||
|
|
raise
|
||
|
|
|
||
|
|
else:
|
||
|
|
node_finder = NodeFinder(frame, stmts, tree, lasti)
|
||
|
|
node = node_finder.result
|
||
|
|
decorator = node_finder.decorator
|
||
|
|
except Exception as e:
|
||
|
|
# These exceptions can be caused by the source code having changed
|
||
|
|
# so the cached Source doesn't match the running code
|
||
|
|
# (e.g. when using IPython %autoreload)
|
||
|
|
# Try again with a fresh Source object
|
||
|
|
if retry_cache and isinstance(e, (NotOneValueFound, AssertionError)):
|
||
|
|
return find(
|
||
|
|
source=cls.for_frame(frame, use_cache=False),
|
||
|
|
retry_cache=False,
|
||
|
|
)
|
||
|
|
if TESTING:
|
||
|
|
raise
|
||
|
|
|
||
|
|
if node:
|
||
|
|
new_stmts = {statement_containing_node(node)}
|
||
|
|
assert_(new_stmts <= stmts)
|
||
|
|
stmts = new_stmts
|
||
|
|
|
||
|
|
return source, node, stmts, decorator
|
||
|
|
|
||
|
|
args = find(source=cls.for_frame(frame), retry_cache=True)
|
||
|
|
executing_cache[key] = args
|
||
|
|
|
||
|
|
return Executing(frame, *args)
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _class_local(cls, name, default):
|
||
|
|
"""
|
||
|
|
Returns an attribute directly associated with this class
|
||
|
|
(as opposed to subclasses), setting default if necessary
|
||
|
|
"""
|
||
|
|
# classes have a mappingproxy preventing us from using setdefault
|
||
|
|
result = cls.__dict__.get(name, default)
|
||
|
|
setattr(cls, name, result)
|
||
|
|
return result
|
||
|
|
|
||
|
|
@cache
|
||
|
|
def statements_at_line(self, lineno):
|
||
|
|
"""
|
||
|
|
Returns the statement nodes overlapping the given line.
|
||
|
|
|
||
|
|
Returns at most one statement unless semicolons are present.
|
||
|
|
|
||
|
|
If the `text` attribute is not valid python, meaning
|
||
|
|
`tree` is None, returns an empty set.
|
||
|
|
|
||
|
|
Otherwise, `Source.for_frame(frame).statements_at_line(frame.f_lineno)`
|
||
|
|
should return at least one statement.
|
||
|
|
"""
|
||
|
|
|
||
|
|
return {
|
||
|
|
statement_containing_node(node)
|
||
|
|
for node in
|
||
|
|
self._nodes_by_line[lineno]
|
||
|
|
}
|
||
|
|
|
||
|
|
@cache
|
||
|
|
def asttokens(self):
|
||
|
|
"""
|
||
|
|
Returns an ASTTokens object for getting the source of specific AST nodes.
|
||
|
|
|
||
|
|
See http://asttokens.readthedocs.io/en/latest/api-index.html
|
||
|
|
"""
|
||
|
|
from asttokens import ASTTokens # must be installed separately
|
||
|
|
return ASTTokens(
|
||
|
|
self.text,
|
||
|
|
tree=self.tree,
|
||
|
|
filename=self.filename,
|
||
|
|
)
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def decode_source(source):
|
||
|
|
if isinstance(source, bytes):
|
||
|
|
encoding = Source.detect_encoding(source)
|
||
|
|
source = source.decode(encoding)
|
||
|
|
return source
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def detect_encoding(source):
|
||
|
|
return detect_encoding(io.BytesIO(source).readline)[0]
|
||
|
|
|
||
|
|
def code_qualname(self, code):
|
||
|
|
"""
|
||
|
|
Imitates the __qualname__ attribute of functions for code objects.
|
||
|
|
Given:
|
||
|
|
|
||
|
|
- A function `func`
|
||
|
|
- A frame `frame` for an execution of `func`, meaning:
|
||
|
|
`frame.f_code is func.__code__`
|
||
|
|
|
||
|
|
`Source.for_frame(frame).code_qualname(frame.f_code)`
|
||
|
|
will be equal to `func.__qualname__`*. Works for Python 2 as well,
|
||
|
|
where of course no `__qualname__` attribute exists.
|
||
|
|
|
||
|
|
Falls back to `code.co_name` if there is no appropriate qualname.
|
||
|
|
|
||
|
|
Based on https://github.com/wbolster/qualname
|
||
|
|
|
||
|
|
(* unless `func` is a lambda
|
||
|
|
nested inside another lambda on the same line, in which case
|
||
|
|
the outer lambda's qualname will be returned for the codes
|
||
|
|
of both lambdas)
|
||
|
|
"""
|
||
|
|
assert_(code.co_filename == self.filename)
|
||
|
|
return self._qualnames.get((code.co_name, code.co_firstlineno), code.co_name)
|
||
|
|
|
||
|
|
|
||
|
|
if PY3:
|
||
|
|
from importlib.abc import MetaPathFinder
|
||
|
|
|
||
|
|
class ReloadCacheFinder(MetaPathFinder):
|
||
|
|
def find_spec(self, fullname, path, target=None):
|
||
|
|
# Based on https://github.com/ipython/ipython/issues/13598#issuecomment-1207869067
|
||
|
|
# to fix that issue.
|
||
|
|
# `target` should be a module (rather than None) if and only if the module is being reloaded.
|
||
|
|
filename = getattr(target, "__file__", None)
|
||
|
|
if not filename:
|
||
|
|
return
|
||
|
|
# Clear any cached data for this filename.
|
||
|
|
linecache.checkcache(filename)
|
||
|
|
for source_class in all_subclasses(Source):
|
||
|
|
source_cache = source_class._class_local("__source_cache", {})
|
||
|
|
source_cache.pop(filename, None)
|
||
|
|
|
||
|
|
sys.meta_path.insert(0, ReloadCacheFinder())
|
||
|
|
|
||
|
|
|
||
|
|
class Executing(object):
|
||
|
|
"""
|
||
|
|
Information about the operation a frame is currently executing.
|
||
|
|
|
||
|
|
Generally you will just want `node`, which is the AST node being executed,
|
||
|
|
or None if it's unknown.
|
||
|
|
|
||
|
|
If a decorator is currently being called, then:
|
||
|
|
- `node` is a function or class definition
|
||
|
|
- `decorator` is the expression in `node.decorator_list` being called
|
||
|
|
- `statements == {node}`
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, frame, source, node, stmts, decorator):
|
||
|
|
self.frame = frame
|
||
|
|
self.source = source
|
||
|
|
self.node = node
|
||
|
|
self.statements = stmts
|
||
|
|
self.decorator = decorator
|
||
|
|
|
||
|
|
def code_qualname(self):
|
||
|
|
return self.source.code_qualname(self.frame.f_code)
|
||
|
|
|
||
|
|
def text(self):
|
||
|
|
return self.source.asttokens().get_text(self.node)
|
||
|
|
|
||
|
|
def text_range(self):
|
||
|
|
return self.source.asttokens().get_text_range(self.node)
|
||
|
|
|
||
|
|
|
||
|
|
class QualnameVisitor(ast.NodeVisitor):
|
||
|
|
def __init__(self):
|
||
|
|
super(QualnameVisitor, self).__init__()
|
||
|
|
self.stack = []
|
||
|
|
self.qualnames = {}
|
||
|
|
|
||
|
|
def add_qualname(self, node, name=None):
|
||
|
|
name = name or node.name
|
||
|
|
self.stack.append(name)
|
||
|
|
if getattr(node, 'decorator_list', ()):
|
||
|
|
lineno = node.decorator_list[0].lineno
|
||
|
|
else:
|
||
|
|
lineno = node.lineno
|
||
|
|
self.qualnames.setdefault((name, lineno), ".".join(self.stack))
|
||
|
|
|
||
|
|
def visit_FunctionDef(self, node, name=None):
|
||
|
|
self.add_qualname(node, name)
|
||
|
|
self.stack.append('<locals>')
|
||
|
|
if isinstance(node, ast.Lambda):
|
||
|
|
children = [node.body]
|
||
|
|
else:
|
||
|
|
children = node.body
|
||
|
|
for child in children:
|
||
|
|
self.visit(child)
|
||
|
|
self.stack.pop()
|
||
|
|
self.stack.pop()
|
||
|
|
|
||
|
|
# Find lambdas in the function definition outside the body,
|
||
|
|
# e.g. decorators or default arguments
|
||
|
|
# Based on iter_child_nodes
|
||
|
|
for field, child in ast.iter_fields(node):
|
||
|
|
if field == 'body':
|
||
|
|
continue
|
||
|
|
if isinstance(child, ast.AST):
|
||
|
|
self.visit(child)
|
||
|
|
elif isinstance(child, list):
|
||
|
|
for grandchild in child:
|
||
|
|
if isinstance(grandchild, ast.AST):
|
||
|
|
self.visit(grandchild)
|
||
|
|
|
||
|
|
visit_AsyncFunctionDef = visit_FunctionDef
|
||
|
|
|
||
|
|
def visit_Lambda(self, node):
|
||
|
|
# noinspection PyTypeChecker
|
||
|
|
self.visit_FunctionDef(node, '<lambda>')
|
||
|
|
|
||
|
|
def visit_ClassDef(self, node):
|
||
|
|
self.add_qualname(node)
|
||
|
|
self.generic_visit(node)
|
||
|
|
self.stack.pop()
|
||
|
|
|
||
|
|
|
||
|
|
future_flags = sum(
|
||
|
|
getattr(__future__, fname).compiler_flag
|
||
|
|
for fname in __future__.all_feature_names
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def compile_similar_to(source, matching_code):
|
||
|
|
return compile(
|
||
|
|
source,
|
||
|
|
matching_code.co_filename,
|
||
|
|
'exec',
|
||
|
|
flags=future_flags & matching_code.co_flags,
|
||
|
|
dont_inherit=True,
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
sentinel = 'io8urthglkjdghvljusketgIYRFYUVGHFRTBGVHKGF78678957647698'
|
||
|
|
|
||
|
|
|
||
|
|
class NodeFinder(object):
|
||
|
|
def __init__(self, frame, stmts, tree, lasti):
|
||
|
|
assert_(stmts)
|
||
|
|
self.frame = frame
|
||
|
|
self.tree = tree
|
||
|
|
self.code = code = frame.f_code
|
||
|
|
self.is_pytest = any(
|
||
|
|
'pytest' in name.lower()
|
||
|
|
for group in [code.co_names, code.co_varnames]
|
||
|
|
for name in group
|
||
|
|
)
|
||
|
|
|
||
|
|
if self.is_pytest:
|
||
|
|
self.ignore_linenos = frozenset(assert_linenos(tree))
|
||
|
|
else:
|
||
|
|
self.ignore_linenos = frozenset()
|
||
|
|
|
||
|
|
self.decorator = None
|
||
|
|
|
||
|
|
self.instruction = instruction = self.get_actual_current_instruction(lasti)
|
||
|
|
op_name = instruction.opname
|
||
|
|
extra_filter = lambda e: True
|
||
|
|
ctx = type(None)
|
||
|
|
|
||
|
|
if op_name.startswith('CALL_'):
|
||
|
|
typ = ast.Call
|
||
|
|
elif op_name.startswith(('BINARY_SUBSCR', 'SLICE+')):
|
||
|
|
typ = ast.Subscript
|
||
|
|
ctx = ast.Load
|
||
|
|
elif op_name.startswith('BINARY_'):
|
||
|
|
typ = ast.BinOp
|
||
|
|
op_type = dict(
|
||
|
|
BINARY_POWER=ast.Pow,
|
||
|
|
BINARY_MULTIPLY=ast.Mult,
|
||
|
|
BINARY_MATRIX_MULTIPLY=getattr(ast, "MatMult", ()),
|
||
|
|
BINARY_FLOOR_DIVIDE=ast.FloorDiv,
|
||
|
|
BINARY_TRUE_DIVIDE=ast.Div,
|
||
|
|
BINARY_MODULO=ast.Mod,
|
||
|
|
BINARY_ADD=ast.Add,
|
||
|
|
BINARY_SUBTRACT=ast.Sub,
|
||
|
|
BINARY_LSHIFT=ast.LShift,
|
||
|
|
BINARY_RSHIFT=ast.RShift,
|
||
|
|
BINARY_AND=ast.BitAnd,
|
||
|
|
BINARY_XOR=ast.BitXor,
|
||
|
|
BINARY_OR=ast.BitOr,
|
||
|
|
)[op_name]
|
||
|
|
extra_filter = lambda e: isinstance(e.op, op_type)
|
||
|
|
elif op_name.startswith('UNARY_'):
|
||
|
|
typ = ast.UnaryOp
|
||
|
|
op_type = dict(
|
||
|
|
UNARY_POSITIVE=ast.UAdd,
|
||
|
|
UNARY_NEGATIVE=ast.USub,
|
||
|
|
UNARY_NOT=ast.Not,
|
||
|
|
UNARY_INVERT=ast.Invert,
|
||
|
|
)[op_name]
|
||
|
|
extra_filter = lambda e: isinstance(e.op, op_type)
|
||
|
|
elif op_name in ('LOAD_ATTR', 'LOAD_METHOD', 'LOOKUP_METHOD'):
|
||
|
|
typ = ast.Attribute
|
||
|
|
ctx = ast.Load
|
||
|
|
extra_filter = lambda e: attr_names_match(e.attr, instruction.argval)
|
||
|
|
elif op_name in ('LOAD_NAME', 'LOAD_GLOBAL', 'LOAD_FAST', 'LOAD_DEREF', 'LOAD_CLASSDEREF'):
|
||
|
|
typ = ast.Name
|
||
|
|
ctx = ast.Load
|
||
|
|
if PY3 or instruction.argval:
|
||
|
|
extra_filter = lambda e: e.id == instruction.argval
|
||
|
|
elif op_name in ('COMPARE_OP', 'IS_OP', 'CONTAINS_OP'):
|
||
|
|
typ = ast.Compare
|
||
|
|
extra_filter = lambda e: len(e.ops) == 1
|
||
|
|
elif op_name.startswith(('STORE_SLICE', 'STORE_SUBSCR')):
|
||
|
|
ctx = ast.Store
|
||
|
|
typ = ast.Subscript
|
||
|
|
elif op_name.startswith('STORE_ATTR'):
|
||
|
|
ctx = ast.Store
|
||
|
|
typ = ast.Attribute
|
||
|
|
extra_filter = lambda e: attr_names_match(e.attr, instruction.argval)
|
||
|
|
else:
|
||
|
|
raise RuntimeError(op_name)
|
||
|
|
|
||
|
|
with lock:
|
||
|
|
exprs = {
|
||
|
|
node
|
||
|
|
for stmt in stmts
|
||
|
|
for node in ast.walk(stmt)
|
||
|
|
if isinstance(node, typ)
|
||
|
|
if isinstance(getattr(node, "ctx", None), ctx)
|
||
|
|
if extra_filter(node)
|
||
|
|
if statement_containing_node(node) == stmt
|
||
|
|
}
|
||
|
|
|
||
|
|
if ctx == ast.Store:
|
||
|
|
# No special bytecode tricks here.
|
||
|
|
# We can handle multiple assigned attributes with different names,
|
||
|
|
# but only one assigned subscript.
|
||
|
|
self.result = only(exprs)
|
||
|
|
return
|
||
|
|
|
||
|
|
matching = list(self.matching_nodes(exprs))
|
||
|
|
if not matching and typ == ast.Call:
|
||
|
|
self.find_decorator(stmts)
|
||
|
|
else:
|
||
|
|
self.result = only(matching)
|
||
|
|
|
||
|
|
def find_decorator(self, stmts):
|
||
|
|
stmt = only(stmts)
|
||
|
|
assert_(isinstance(stmt, (ast.ClassDef, function_node_types)))
|
||
|
|
decorators = stmt.decorator_list
|
||
|
|
assert_(decorators)
|
||
|
|
line_instructions = [
|
||
|
|
inst
|
||
|
|
for inst in self.clean_instructions(self.code)
|
||
|
|
if inst.lineno == self.frame.f_lineno
|
||
|
|
]
|
||
|
|
last_decorator_instruction_index = [
|
||
|
|
i
|
||
|
|
for i, inst in enumerate(line_instructions)
|
||
|
|
if inst.opname == "CALL_FUNCTION"
|
||
|
|
][-1]
|
||
|
|
assert_(
|
||
|
|
line_instructions[last_decorator_instruction_index + 1].opname.startswith(
|
||
|
|
"STORE_"
|
||
|
|
)
|
||
|
|
)
|
||
|
|
decorator_instructions = line_instructions[
|
||
|
|
last_decorator_instruction_index
|
||
|
|
- len(decorators)
|
||
|
|
+ 1 : last_decorator_instruction_index
|
||
|
|
+ 1
|
||
|
|
]
|
||
|
|
assert_({inst.opname for inst in decorator_instructions} == {"CALL_FUNCTION"})
|
||
|
|
decorator_index = decorator_instructions.index(self.instruction)
|
||
|
|
decorator = decorators[::-1][decorator_index]
|
||
|
|
self.decorator = decorator
|
||
|
|
self.result = stmt
|
||
|
|
|
||
|
|
def clean_instructions(self, code):
|
||
|
|
return [
|
||
|
|
inst
|
||
|
|
for inst in get_instructions(code)
|
||
|
|
if inst.opname not in ("EXTENDED_ARG", "NOP")
|
||
|
|
if inst.lineno not in self.ignore_linenos
|
||
|
|
]
|
||
|
|
|
||
|
|
def get_original_clean_instructions(self):
|
||
|
|
result = self.clean_instructions(self.code)
|
||
|
|
|
||
|
|
# pypy sometimes (when is not clear)
|
||
|
|
# inserts JUMP_IF_NOT_DEBUG instructions in bytecode
|
||
|
|
# If they're not present in our compiled instructions,
|
||
|
|
# ignore them in the original bytecode
|
||
|
|
if not any(
|
||
|
|
inst.opname == "JUMP_IF_NOT_DEBUG"
|
||
|
|
for inst in self.compile_instructions()
|
||
|
|
):
|
||
|
|
result = [
|
||
|
|
inst for inst in result
|
||
|
|
if inst.opname != "JUMP_IF_NOT_DEBUG"
|
||
|
|
]
|
||
|
|
|
||
|
|
return result
|
||
|
|
|
||
|
|
def matching_nodes(self, exprs):
|
||
|
|
original_instructions = self.get_original_clean_instructions()
|
||
|
|
original_index = only(
|
||
|
|
i
|
||
|
|
for i, inst in enumerate(original_instructions)
|
||
|
|
if inst == self.instruction
|
||
|
|
)
|
||
|
|
for expr_index, expr in enumerate(exprs):
|
||
|
|
setter = get_setter(expr)
|
||
|
|
# noinspection PyArgumentList
|
||
|
|
replacement = ast.BinOp(
|
||
|
|
left=expr,
|
||
|
|
op=ast.Pow(),
|
||
|
|
right=ast.Str(s=sentinel),
|
||
|
|
)
|
||
|
|
ast.fix_missing_locations(replacement)
|
||
|
|
setter(replacement)
|
||
|
|
try:
|
||
|
|
instructions = self.compile_instructions()
|
||
|
|
finally:
|
||
|
|
setter(expr)
|
||
|
|
|
||
|
|
if sys.version_info >= (3, 10):
|
||
|
|
try:
|
||
|
|
handle_jumps(instructions, original_instructions)
|
||
|
|
except Exception:
|
||
|
|
# Give other candidates a chance
|
||
|
|
if TESTING or expr_index < len(exprs) - 1:
|
||
|
|
continue
|
||
|
|
raise
|
||
|
|
|
||
|
|
indices = [
|
||
|
|
i
|
||
|
|
for i, instruction in enumerate(instructions)
|
||
|
|
if instruction.argval == sentinel
|
||
|
|
]
|
||
|
|
|
||
|
|
# There can be several indices when the bytecode is duplicated,
|
||
|
|
# as happens in a finally block in 3.9+
|
||
|
|
# First we remove the opcodes caused by our modifications
|
||
|
|
for index_num, sentinel_index in enumerate(indices):
|
||
|
|
# Adjustment for removing sentinel instructions below
|
||
|
|
# in past iterations
|
||
|
|
sentinel_index -= index_num * 2
|
||
|
|
|
||
|
|
assert_(instructions.pop(sentinel_index).opname == 'LOAD_CONST')
|
||
|
|
assert_(instructions.pop(sentinel_index).opname == 'BINARY_POWER')
|
||
|
|
|
||
|
|
# Then we see if any of the instruction indices match
|
||
|
|
for index_num, sentinel_index in enumerate(indices):
|
||
|
|
sentinel_index -= index_num * 2
|
||
|
|
new_index = sentinel_index - 1
|
||
|
|
|
||
|
|
if new_index != original_index:
|
||
|
|
continue
|
||
|
|
|
||
|
|
original_inst = original_instructions[original_index]
|
||
|
|
new_inst = instructions[new_index]
|
||
|
|
|
||
|
|
# In Python 3.9+, changing 'not x in y' to 'not sentinel_transformation(x in y)'
|
||
|
|
# changes a CONTAINS_OP(invert=1) to CONTAINS_OP(invert=0),<sentinel stuff>,UNARY_NOT
|
||
|
|
if (
|
||
|
|
original_inst.opname == new_inst.opname in ('CONTAINS_OP', 'IS_OP')
|
||
|
|
and original_inst.arg != new_inst.arg
|
||
|
|
and (
|
||
|
|
original_instructions[original_index + 1].opname
|
||
|
|
!= instructions[new_index + 1].opname == 'UNARY_NOT'
|
||
|
|
)):
|
||
|
|
# Remove the difference for the upcoming assert
|
||
|
|
instructions.pop(new_index + 1)
|
||
|
|
|
||
|
|
# Check that the modified instructions don't have anything unexpected
|
||
|
|
# 3.10 is a bit too weird to assert this in all cases but things still work
|
||
|
|
if sys.version_info < (3, 10):
|
||
|
|
for inst1, inst2 in zip_longest(
|
||
|
|
original_instructions, instructions
|
||
|
|
):
|
||
|
|
assert_(inst1 and inst2 and opnames_match(inst1, inst2))
|
||
|
|
|
||
|
|
yield expr
|
||
|
|
|
||
|
|
def compile_instructions(self):
|
||
|
|
module_code = compile_similar_to(self.tree, self.code)
|
||
|
|
code = only(self.find_codes(module_code))
|
||
|
|
return self.clean_instructions(code)
|
||
|
|
|
||
|
|
def find_codes(self, root_code):
|
||
|
|
checks = [
|
||
|
|
attrgetter('co_firstlineno'),
|
||
|
|
attrgetter('co_freevars'),
|
||
|
|
attrgetter('co_cellvars'),
|
||
|
|
lambda c: is_ipython_cell_code_name(c.co_name) or c.co_name,
|
||
|
|
]
|
||
|
|
if not self.is_pytest:
|
||
|
|
checks += [
|
||
|
|
attrgetter('co_names'),
|
||
|
|
attrgetter('co_varnames'),
|
||
|
|
]
|
||
|
|
|
||
|
|
def matches(c):
|
||
|
|
return all(
|
||
|
|
f(c) == f(self.code)
|
||
|
|
for f in checks
|
||
|
|
)
|
||
|
|
|
||
|
|
code_options = []
|
||
|
|
if matches(root_code):
|
||
|
|
code_options.append(root_code)
|
||
|
|
|
||
|
|
def finder(code):
|
||
|
|
for const in code.co_consts:
|
||
|
|
if not inspect.iscode(const):
|
||
|
|
continue
|
||
|
|
|
||
|
|
if matches(const):
|
||
|
|
code_options.append(const)
|
||
|
|
finder(const)
|
||
|
|
|
||
|
|
finder(root_code)
|
||
|
|
return code_options
|
||
|
|
|
||
|
|
def get_actual_current_instruction(self, lasti):
|
||
|
|
"""
|
||
|
|
Get the instruction corresponding to the current
|
||
|
|
frame offset, skipping EXTENDED_ARG instructions
|
||
|
|
"""
|
||
|
|
# Don't use get_original_clean_instructions
|
||
|
|
# because we need the actual instructions including
|
||
|
|
# EXTENDED_ARG
|
||
|
|
instructions = list(get_instructions(self.code))
|
||
|
|
index = only(
|
||
|
|
i
|
||
|
|
for i, inst in enumerate(instructions)
|
||
|
|
if inst.offset == lasti
|
||
|
|
)
|
||
|
|
|
||
|
|
while True:
|
||
|
|
instruction = instructions[index]
|
||
|
|
if instruction.opname != "EXTENDED_ARG":
|
||
|
|
return instruction
|
||
|
|
index += 1
|
||
|
|
|
||
|
|
|
||
|
|
def non_sentinel_instructions(instructions, start):
|
||
|
|
"""
|
||
|
|
Yields (index, instruction) pairs excluding the basic
|
||
|
|
instructions introduced by the sentinel transformation
|
||
|
|
"""
|
||
|
|
skip_power = False
|
||
|
|
for i, inst in islice(enumerate(instructions), start, None):
|
||
|
|
if inst.argval == sentinel:
|
||
|
|
assert_(inst.opname == "LOAD_CONST")
|
||
|
|
skip_power = True
|
||
|
|
continue
|
||
|
|
elif skip_power:
|
||
|
|
assert_(inst.opname == "BINARY_POWER")
|
||
|
|
skip_power = False
|
||
|
|
continue
|
||
|
|
yield i, inst
|
||
|
|
|
||
|
|
|
||
|
|
def walk_both_instructions(original_instructions, original_start, instructions, start):
|
||
|
|
"""
|
||
|
|
Yields matching indices and instructions from the new and original instructions,
|
||
|
|
leaving out changes made by the sentinel transformation.
|
||
|
|
"""
|
||
|
|
original_iter = islice(enumerate(original_instructions), original_start, None)
|
||
|
|
new_iter = non_sentinel_instructions(instructions, start)
|
||
|
|
inverted_comparison = False
|
||
|
|
while True:
|
||
|
|
try:
|
||
|
|
original_i, original_inst = next(original_iter)
|
||
|
|
new_i, new_inst = next(new_iter)
|
||
|
|
except StopIteration:
|
||
|
|
return
|
||
|
|
if (
|
||
|
|
inverted_comparison
|
||
|
|
and original_inst.opname != new_inst.opname == "UNARY_NOT"
|
||
|
|
):
|
||
|
|
new_i, new_inst = next(new_iter)
|
||
|
|
inverted_comparison = (
|
||
|
|
original_inst.opname == new_inst.opname in ("CONTAINS_OP", "IS_OP")
|
||
|
|
and original_inst.arg != new_inst.arg
|
||
|
|
)
|
||
|
|
yield original_i, original_inst, new_i, new_inst
|
||
|
|
|
||
|
|
|
||
|
|
def handle_jumps(instructions, original_instructions):
|
||
|
|
"""
|
||
|
|
Transforms instructions in place until it looks more like original_instructions.
|
||
|
|
This is only needed in 3.10+ where optimisations lead to more drastic changes
|
||
|
|
after the sentinel transformation.
|
||
|
|
Replaces JUMP instructions that aren't also present in original_instructions
|
||
|
|
with the sections that they jump to until a raise or return.
|
||
|
|
In some other cases duplication found in `original_instructions`
|
||
|
|
is replicated in `instructions`.
|
||
|
|
"""
|
||
|
|
while True:
|
||
|
|
for original_i, original_inst, new_i, new_inst in walk_both_instructions(
|
||
|
|
original_instructions, 0, instructions, 0
|
||
|
|
):
|
||
|
|
if opnames_match(original_inst, new_inst):
|
||
|
|
continue
|
||
|
|
|
||
|
|
if "JUMP" in new_inst.opname and "JUMP" not in original_inst.opname:
|
||
|
|
# Find where the new instruction is jumping to, ignoring
|
||
|
|
# instructions which have been copied in previous iterations
|
||
|
|
start = only(
|
||
|
|
i
|
||
|
|
for i, inst in enumerate(instructions)
|
||
|
|
if inst.offset == new_inst.argval
|
||
|
|
and not getattr(inst, "_copied", False)
|
||
|
|
)
|
||
|
|
# Replace the jump instruction with the jumped to section of instructions
|
||
|
|
# That section may also be deleted if it's not similarly duplicated
|
||
|
|
# in original_instructions
|
||
|
|
instructions[new_i : new_i + 1] = handle_jump(
|
||
|
|
original_instructions, original_i, instructions, start
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
# Extract a section of original_instructions from original_i to return/raise
|
||
|
|
orig_section = []
|
||
|
|
for section_inst in original_instructions[original_i:]:
|
||
|
|
orig_section.append(section_inst)
|
||
|
|
if section_inst.opname in ("RETURN_VALUE", "RAISE_VARARGS"):
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
# No return/raise - this is just a mismatch we can't handle
|
||
|
|
raise AssertionError
|
||
|
|
|
||
|
|
instructions[new_i:new_i] = only(find_new_matching(orig_section, instructions))
|
||
|
|
|
||
|
|
# instructions has been modified, the for loop can't sensibly continue
|
||
|
|
# Restart it from the beginning, checking for other issues
|
||
|
|
break
|
||
|
|
|
||
|
|
else: # No mismatched jumps found, we're done
|
||
|
|
return
|
||
|
|
|
||
|
|
|
||
|
|
def find_new_matching(orig_section, instructions):
|
||
|
|
"""
|
||
|
|
Yields sections of `instructions` which match `orig_section`.
|
||
|
|
The yielded sections include sentinel instructions, but these
|
||
|
|
are ignored when checking for matches.
|
||
|
|
"""
|
||
|
|
for start in range(len(instructions) - len(orig_section)):
|
||
|
|
indices, dup_section = zip(
|
||
|
|
*islice(
|
||
|
|
non_sentinel_instructions(instructions, start),
|
||
|
|
len(orig_section),
|
||
|
|
)
|
||
|
|
)
|
||
|
|
if len(dup_section) < len(orig_section):
|
||
|
|
return
|
||
|
|
if sections_match(orig_section, dup_section):
|
||
|
|
yield instructions[start:indices[-1] + 1]
|
||
|
|
|
||
|
|
|
||
|
|
def handle_jump(original_instructions, original_start, instructions, start):
|
||
|
|
"""
|
||
|
|
Returns the section of instructions starting at `start` and ending
|
||
|
|
with a RETURN_VALUE or RAISE_VARARGS instruction.
|
||
|
|
There should be a matching section in original_instructions starting at original_start.
|
||
|
|
If that section doesn't appear elsewhere in original_instructions,
|
||
|
|
then also delete the returned section of instructions.
|
||
|
|
"""
|
||
|
|
for original_j, original_inst, new_j, new_inst in walk_both_instructions(
|
||
|
|
original_instructions, original_start, instructions, start
|
||
|
|
):
|
||
|
|
assert_(opnames_match(original_inst, new_inst))
|
||
|
|
if original_inst.opname in ("RETURN_VALUE", "RAISE_VARARGS"):
|
||
|
|
inlined = deepcopy(instructions[start : new_j + 1])
|
||
|
|
for inl in inlined:
|
||
|
|
inl._copied = True
|
||
|
|
orig_section = original_instructions[original_start : original_j + 1]
|
||
|
|
if not check_duplicates(
|
||
|
|
original_start, orig_section, original_instructions
|
||
|
|
):
|
||
|
|
instructions[start : new_j + 1] = []
|
||
|
|
return inlined
|
||
|
|
|
||
|
|
|
||
|
|
def check_duplicates(original_i, orig_section, original_instructions):
|
||
|
|
"""
|
||
|
|
Returns True if a section of original_instructions starting somewhere other
|
||
|
|
than original_i and matching orig_section is found, i.e. orig_section is duplicated.
|
||
|
|
"""
|
||
|
|
for dup_start in range(len(original_instructions)):
|
||
|
|
if dup_start == original_i:
|
||
|
|
continue
|
||
|
|
dup_section = original_instructions[dup_start : dup_start + len(orig_section)]
|
||
|
|
if len(dup_section) < len(orig_section):
|
||
|
|
return False
|
||
|
|
if sections_match(orig_section, dup_section):
|
||
|
|
return True
|
||
|
|
|
||
|
|
|
||
|
|
def sections_match(orig_section, dup_section):
|
||
|
|
"""
|
||
|
|
Returns True if the given lists of instructions have matching linenos and opnames.
|
||
|
|
"""
|
||
|
|
return all(
|
||
|
|
(
|
||
|
|
orig_inst.lineno == dup_inst.lineno
|
||
|
|
# POP_BLOCKs have been found to have differing linenos in innocent cases
|
||
|
|
or "POP_BLOCK" == orig_inst.opname == dup_inst.opname
|
||
|
|
)
|
||
|
|
and opnames_match(orig_inst, dup_inst)
|
||
|
|
for orig_inst, dup_inst in zip(orig_section, dup_section)
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def opnames_match(inst1, inst2):
|
||
|
|
return (
|
||
|
|
inst1.opname == inst2.opname
|
||
|
|
or "JUMP" in inst1.opname
|
||
|
|
and "JUMP" in inst2.opname
|
||
|
|
or (inst1.opname == "PRINT_EXPR" and inst2.opname == "POP_TOP")
|
||
|
|
or (
|
||
|
|
inst1.opname in ("LOAD_METHOD", "LOOKUP_METHOD")
|
||
|
|
and inst2.opname == "LOAD_ATTR"
|
||
|
|
)
|
||
|
|
or (inst1.opname == "CALL_METHOD" and inst2.opname == "CALL_FUNCTION")
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def get_setter(node):
|
||
|
|
parent = node.parent
|
||
|
|
for name, field in ast.iter_fields(parent):
|
||
|
|
if field is node:
|
||
|
|
return lambda new_node: setattr(parent, name, new_node)
|
||
|
|
elif isinstance(field, list):
|
||
|
|
for i, item in enumerate(field):
|
||
|
|
if item is node:
|
||
|
|
def setter(new_node):
|
||
|
|
field[i] = new_node
|
||
|
|
|
||
|
|
return setter
|
||
|
|
|
||
|
|
|
||
|
|
lock = RLock()
|
||
|
|
|
||
|
|
|
||
|
|
@cache
|
||
|
|
def statement_containing_node(node):
|
||
|
|
while not isinstance(node, ast.stmt):
|
||
|
|
node = node.parent
|
||
|
|
return node
|
||
|
|
|
||
|
|
|
||
|
|
def assert_linenos(tree):
|
||
|
|
for node in ast.walk(tree):
|
||
|
|
if (
|
||
|
|
hasattr(node, 'parent') and
|
||
|
|
isinstance(statement_containing_node(node), ast.Assert)
|
||
|
|
):
|
||
|
|
for lineno in node_linenos(node):
|
||
|
|
yield lineno
|
||
|
|
|
||
|
|
|
||
|
|
def _extract_ipython_statement(stmt):
|
||
|
|
# IPython separates each statement in a cell to be executed separately
|
||
|
|
# So NodeFinder should only compile one statement at a time or it
|
||
|
|
# will find a code mismatch.
|
||
|
|
while not isinstance(stmt.parent, ast.Module):
|
||
|
|
stmt = stmt.parent
|
||
|
|
# use `ast.parse` instead of `ast.Module` for better portability
|
||
|
|
# python3.8 changes the signature of `ast.Module`
|
||
|
|
# Inspired by https://github.com/pallets/werkzeug/pull/1552/files
|
||
|
|
tree = ast.parse("")
|
||
|
|
tree.body = [stmt]
|
||
|
|
ast.copy_location(tree, stmt)
|
||
|
|
return tree
|
||
|
|
|
||
|
|
|
||
|
|
def is_ipython_cell_code_name(code_name):
|
||
|
|
return bool(re.match(r"(<module>|<cell line: \d+>)$", code_name))
|
||
|
|
|
||
|
|
|
||
|
|
def is_ipython_cell_filename(filename):
|
||
|
|
return re.search(r"<ipython-input-|[/\\]ipykernel_\d+[/\\]", filename)
|
||
|
|
|
||
|
|
|
||
|
|
def is_ipython_cell_code(code_obj):
|
||
|
|
return (
|
||
|
|
is_ipython_cell_filename(code_obj.co_filename) and
|
||
|
|
is_ipython_cell_code_name(code_obj.co_name)
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def attr_names_match(attr, argval):
|
||
|
|
"""
|
||
|
|
Checks that the user-visible attr (from ast) can correspond to
|
||
|
|
the argval in the bytecode, i.e. the real attribute fetched internally,
|
||
|
|
which may be mangled for private attributes.
|
||
|
|
"""
|
||
|
|
if attr == argval:
|
||
|
|
return True
|
||
|
|
if not attr.startswith("__"):
|
||
|
|
return False
|
||
|
|
return bool(re.match(r"^_\w+%s$" % attr, argval))
|
||
|
|
|
||
|
|
|
||
|
|
def node_linenos(node):
|
||
|
|
if hasattr(node, "lineno"):
|
||
|
|
if hasattr(node, "end_lineno") and isinstance(node, ast.expr):
|
||
|
|
linenos = range(node.lineno, node.end_lineno + 1)
|
||
|
|
else:
|
||
|
|
linenos = [node.lineno]
|
||
|
|
for lineno in linenos:
|
||
|
|
yield lineno
|
||
|
|
|
||
|
|
|
||
|
|
def all_subclasses(cls):
|
||
|
|
"""
|
||
|
|
Returns a set of all subclasses of a given class, including the class itself,
|
||
|
|
and all direct and indirect descendants.
|
||
|
|
"""
|
||
|
|
direct = set(cls.__subclasses__())
|
||
|
|
return {cls} | {s for c in direct for s in all_subclasses(c)}
|