On macos arm64, objc.objc_msgSend seg-faults when called from ipython

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#562 创建于 2020年11月27日 5 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

还没有人认领这个 Issue。

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难度: 4/5
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新手友好度: 32/100

Issue 类型: 缺陷
描述清晰度: 基本清楚
活跃度: 停滞
技术栈: jupyter, macos, objective-c, python
领域: backend, operating-systems

调研方向

首先，按照描述在 arm64 macOS 系统上使用 ipython/ipykernel 重现该代码片段，并将其与 system Python 和 conda-forge Python 进行比较。跟踪 ctypes objc.objc_msgSend 调用并查看相关的 issue #561；当所示的 Objective-C 调用在受影响的 ipython/ipykernel 环境中不再崩溃时，即表示完成。

由索引模型根据 Issue 内容生成。

描述

Related to #561 , ipython/ipykernel/etc will seg-fault when running the following test code (based on appnope):

import ctypes
import ctypes.util

objc = ctypes.cdll.LoadLibrary(ctypes.util.find_library('objc'))

def _utf8(s):
    """ensure utf8 bytes"""
    if not isinstance(s, bytes):
        s = s.encode('utf8')
    return s

def n(name):
    """create a selector name (for methods)"""
    return objc.sel_registerName(_utf8(name))

def C(classname):
    """get an ObjC Class by name"""
    return objc.objc_getClass(_utf8(classname))

NSString = C('NSString')

objc.objc_msgSend(NSString, n("stringWithUTF8String:"), _utf8("reason"))

The stack trace on an arm64 mac (DTK) says: python[97504:4905234] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[NSString stringWithUTF8String:]: NULL cString'

Note that this code will work with both system python (macos 11.0.1) and conda-forge python 3.9.0 for osx-arm64. However, it will seg-fault with ipython/ipykernel from conda-forge or with ipython installed with the system python via pip.

主要语言: Python
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