GDB:创建局部变量? [英] GDB: Create local variable?

问题描述

我正在使用Xcode的调试器.在断点处停止时，是否可以在GDB命令提示符下键入命令以创建局部变量?如果是这样，怎么办?请提供示例.

I'm using Xcode's debugger. While stopped at a breakpoint, is there a command I can type in the GDB command prompt to create a local variable? If so, how? Please provide an example.

我知道我可以在代码中做到这一点，然后重新编译程序，但是我正在寻找一种更快的方法.

I know I can do it in the code and then recompile the program, but I'm looking for a faster way.

推荐答案

注释中提到了它，但没有作为答案:如果您不需要在代码中引用变量，而只想做一些广告，进行专门调查，您可以使用便捷变量以<代码> $ :

It's mentioned in the comments, but not as an answer: if you don't need to reference the variable in your code but just want to do some ad-hoc investigation, you can use Convenience Variables Start your variable with a $:

(gdb) set $foo = method_that_makes_something()
(gdb) set $bar = 15
(gdb) p $bar
$4 = 15

打印时，您会注意到它带有数字变量的前缀-您以后也可以使用它们来引用该值:

You'll notice when you print things it's prefixed with a numeric variable - you can use these to refer to that value later as well:

(gdb) p $4
$5 = 15

要重申:这实际上并不会影响程序的堆栈或其他任何东西，因为这会破坏很多东西，但是如果您只需要本地游乐场，一些循环变量等，则很有用.

To reiterate: this doesn't actually affect the program's stack or anything, as that would break a lot of things, but it's useful if you just need a local playground, some loop variables, etc.

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