xcode 在导致 EXC_BAD_ACCESS 的断点处停止
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Stopping at breakpoints causing EXC_BAD_ACCESS
提问by Dann
My app runs fine and as expected, but for some reason when I place breakpoints, stepping into/over/resuming causes the program to crash with EXC_BAD_ACCESS. This does not happen if I remove/disable breakpoints.
我的应用程序按预期运行正常，但由于某种原因，当我放置断点时，单步执行/结束/恢复会导致程序因 EXC_BAD_ACCESS 而崩溃。如果我删除/禁用断点，则不会发生这种情况。
Any advice?
有什么建议吗？
回答by gak
From what I can see, LLDB appears to be broken in the Xcode 4.2 and 4.2.1. Switch to GDB in your "Edit Scheme" settings.
据我所知，LLDB 在 Xcode 4.2 和 4.2.1 中似乎已损坏。在“编辑方案”设置中切换到 GDB。
Breakpoints work just as expected after switching to GDB.
切换到 GDB 后，断点按预期工作。
回答by Andrew
To anyone that might experience the same thing with Xcode 5.0.1 and Mavericks: Try deleting all your schemes and auto create them again - that fixed it for me.
对于可能在 Xcode 5.0.1 和 Mavericks 中遇到相同问题的任何人：尝试删除所有方案并再次自动创建它们 - 为我修复了它。
回答by Mário Carvalho
This was a bug with XCode 5.0.1 and Mavericks. Apple released 5.0.2 and the bug is fixed!
这是 XCode 5.0.1 和 Mavericks 的一个错误。Apple 发布 5.0.2 并修复了错误！
回答by Hill
I am using the Xcode 4.3.2 and Xcode update the debug to LLDB automatically(A popup dialog and I confirm it). This is really a nightmare, it crash when I step into any function call 8-9 out of 10.
我正在使用 Xcode 4.3.2 并且 Xcode 自动将调试更新到 LLDB（一个弹出对话框，我确认了它）。这真的是一场噩梦，当我进入 10 个中的第 8-9 个函数调用时它会崩溃。
Change back to GDB seems better now!
现在改回 GDB 似乎更好了！
回答by Guillaume Laurent
Where you using lldb instead of gdb ? I'm getting this systematically with Xcode 4.2.1 and lldb. Switching back to gdb (booooo) solves the problem.
你在哪里使用 lldb 而不是 gdb ？我用 Xcode 4.2.1 和 lldb 系统地得到了这个。切换回 gdb (booooo) 解决了这个问题。
回答by Colin
For what it's worth, I'm having the same problem. I can take code that I know is correct and if I step into it with lldb, it crashes after reaching a breakpoint. I also get output like this when I try to print any locals
对于它的价值，我遇到了同样的问题。我可以使用我知道正确的代码，如果我使用 lldb 进入它，它会在到达断点后崩溃。当我尝试打印任何当地人时，我也会得到这样的输出
(lldb) p self
error: use of undeclared identifier 'self'
error: 1 errors parsing expression
Looks like lldb is busted in Xcode 4.2.1. The only advice I have is switch back to gdb for now.
看起来 lldb 在 Xcode 4.2.1 中被破坏了。我唯一的建议是暂时切换回 gdb。
回答by Alan Zeino
EXC_BAD_ACCESSmeans you have a memory problem somewhere - very likely that something is being released when you expect it to still be around (perhaps the result of an autorelease). Run the static analyzerto find it. I imagine you're seeing the crash because the debugger is aggressively occupying memory when you load breakpoints and hence flagging a problem somewhere else.
EXC_BAD_ACCESS意味着您在某处有内存问题 - 很可能是在您期望它仍然存在时正在释放某些东西（可能是 的结果autorelease）。运行静态分析器以找到它。我想您会看到崩溃，因为当您加载断点并因此在其他地方标记问题时，调试器正在大量占用内存。
