xcode 使用LLDB进行IOS调试类成员变量NSArray
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Using LLDB for IOS debug class member variable NSArray
提问by kkurni
Does anyone know how to get the value for class member variable in IOS ?
有谁知道如何在 IOS 中获取类成员变量的值？
I try to use LLDB to debug NSArray in class member variable.
我尝试使用 LLDB 来调试类成员变量中的 NSArray。
After I run this
在我运行这个之后
__cellDataShadowArray2D = [[NSArray alloc] initWithObjects:[NSArray arrayWithObjects:obj1, obj2, nil], nil];
When I check the value using LLDB (print object), I always get this.
当我使用 LLDB（打印对象）检查值时，我总是得到这个。
(lldb) po __cellDataShadowArray2D
(NSArray *) = 0x001e8894 <object returned empty description>
(lldb) p __cellDataShadowArray2D
(NSArray *) = 0x001e8894
(lldb) po [__cellDataShadowArray2D count]
2012-04-24 10:10:38.535 SOME [61985:15803] -[__NSCFConstantString count]: unrecognized selector sent to instance 0x1e8894
(id) = 0x00000000 <nil>
(lldb) po [__cellDataShadowArray2D retainCount]
(id) = 0xffffffff [no Objective-C description available]
(lldb) p (int) [__cellDataShadowArray2D retainCount]
(int) = -1
(lldb) p (int) [__cellDataShadowArray2D count]
2012-04-24 10:11:31.333 SOME [61985:15803] -[__NSCFConstantString count]: unrecognized selector sent to instance 0x1e8894
(int) = 0
回答by bbum
- make sure the line of code is actually evaluated before doing the test.
- 确保在进行测试之前实际评估了这行代码。
It is clear that __cellDataShadowArray2D is pointing to an empty instance of a compiled constant string; @"". That means it cannot be an over-release or anything like that; it means that the assignment has not yet happened (or you are attempting to debug optimized code and the debugger is confused due to optimizations).
很明显 __cellDataShadowArray2D 指向的是一个编译后的常量字符串的空实例；@""。这意味着它不能过度释放或类似的东西；这意味着分配尚未发生（或者您正在尝试调试优化的代码并且调试器由于优化而感到困惑）。
po of non-object types doesn't make sense
retainCountis useless. Don't call it.
非对象类型的 po 没有意义
retainCount没用。不要叫它。
回答by Valerio
It is definitely a LLDB problem. I had the same, coud not debug at all. I switched back to GDB and it was ok
这绝对是一个 LLDB 问题。我也有同样的情况，根本无法调试。我切换回 GDB 没问题
