问题
Is there any way to watch a variable in Xcode using LLDB ? Or is this only possible with GDB ?
I'm trying to use the command watchpoint set variable but I get the message:
invalid command 'watchpoint set'
回答1:
Watchpoints are supported for iOS and Mac OS X debugging as of Xcode 4.5. To set a breakpoint on a variable named foo, do
(lldb) watchpoint set variable foo
you can always use the shortest unambiguous name for commands in the lldb console so
(lldb) w s v foo
would also work here.
In Xcode, in the locals window you can right-click/control-click on variables and you'll have an option to set a watchpoint on it.
The current arm and x86 cpus only support 4 watchpoints being active at the same time.
回答2:
Try using
frame variable -w
instead. The 'watchpoint set' command is in lldb's development branch, and will likely make it in to a future version of Xcode.
For example:
frame variable -w write myvar
EDIT: The watch set variable syntax mentioned in the original post is now supported in lldb in XCode 4.4 and greater.
来源：https://stackoverflow.com/questions/11199421/xcode-lldb-watchpoints