Xcode LLDB watchpoints

xcode gdb lldb
the Reverend picture the Reverend · Jun 26, 2012 · Viewed 11.7k times · Source

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'

Answer

Jason Molenda picture Jason Molenda · Oct 17, 2012

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.

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