Tuesday, August 14, 2018 [Tweets] [Favorites]

Finding What Code Triggered a Log Message

Daniel Jalkut:

What this does is add a series of commands that will be run automatically by lldb whenever breakpoint 5 (the one I just set) is hit. This applies to any of the 634 locations that are associated with the regular expression I provided. When the breakpoint is hit, it will first invoke the “bt” command to print a backtrace of all the calls leading up to this call, and then it will invoke the “continue” command to keep running the app. After the app has run for a bit, I search the debugger console for “!!!” which I remembered from the original warning. Locating it, I simply scroll up to see the backtrace command that had most recently been invoked[…]

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Next time you’re at a loss for how or where something could possibly be happening, consider the possibility of setting a broad, regular expression based breakpoint, and a series of commands to help clarify what’s happening when those breakpoints are hit.

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