为什么codewarrior中查看不了局部变量？

hermitzg

我用的是codewarrior 7.0，在调试的时候，函数内部的局部变量在变量查看视图中，总是提示“unknown error”，除非我在局部变量前加上volatile，或者让这个变量成为全局变量，才能看到值，真奇怪，有哪位高手能告诉我，非常感谢！

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baishaohu

有这个问题，我用的是5.5，也存在局部变量实时调试显示问题。
哪怕就是在该位置设置断点，单步运行，都提示改变量未分配内存。
莫名其妙？

gavin_rb

可能是局部变量与全局变量重名;或有相同的局部变量名.

wal5wx

the debugger can read from the memory while the  target is running (using BDM background cycles). This works only for  memory (with an address), but not for CPU core registers.
So with global memory you are ok.
But  local variables are on the stack, and the address of it is not always  the same. Even more: the scope of the function might not be 'alive', so  the debugger cannot read that variable, so this won't work for local  variables.
 
What you can do is: make the variable a 'static local':
void foo(void) {
  static int myStaticLocal;
...
}
and that way it will be in global memory, so you can watch it (but: it won't bee reentrant).
 If  you think your variable is always at a certain address on the stack  (what usually is not the case), then you simply could watch that address  on the stack too (e.g. in the memory view).
 

0xaa

wal5wx 发表于 2012-4-3 22:22
the debugger can read from the memory while the  target is running (using BDM background cycles). Th ...

Great