WWDC Notes

Advanced Debugging and the Address Sanitizer

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Discover UI debugging and how to use advanced breakpoint actions to quickly explore and fix your app. Learn how the new Address Sanitizer feature finds buffer overflows, use-after-free errors, and other memory corruption bugs at run time.

View Debugger

  • Focus on troublesome views
  • Visualize your constraints

View Debugger helps you visualize the hierarchy of views in current view. It's a great way to view the relationship between views(sibling and parent/child), also it's a great place to see the auto layout constraints between these views.

Advanced Breakpoint Actions

  • Catch exceptions at throw, print message
  • Print expressions without adding clutter

Under Breakpoint Navigator, user could manually add variety breakpoints, shows in the following image:

BreakpointList

In the demo, click 'Exception Breakpoint' to add a general exception breakpoint, but this would not show any exception error information.

To display further information about exception error, one trick to do is in the console at the breakpoint, po $arg1 could print out the latest exception error message in the console, which means we could add this as an action for corresponding breakpoint.

Address Sanitizer (ASan)

Enable this tool in Edit Scheme... under Diagnostic

The benefit of using ASan to Analyze Memory Corruption - Use after free - Heap buffer overflow - Stack buffer overflow - Global variable overflow Overflows in C++ containers - Use after return

It's better to use it under none [-O0] optimization configuration.

This note was originally published at https://github.com/antonio081014/WWDC_Learning_Review

Missing anything? Corrections? Contributions are welcome 😃

Written by

antonio081014

Yi Ding

Write the Code, Change the World.