Can someone explain what do these options in Xcode do?
what they are and what they do and how useful can they be for debugging/testing?
thanks.
MallocScribble. If set, free sets each byte of every released block to the value 0x55 . MallocPreScribble. If set, malloc sets each byte of a newly allocated block to the value 0xAA . This increases the likelihood that a program making assumptions about freshly allocated memory fails.
To enable debugging using Guard Malloc, choose the Run > Enable Guard Malloc option in Xcode before running your project. Building and running your application with this option enabled runs your application using the Guard Malloc library automatically.
From the documentation.
Scribble will make it rather obvious that you're using a memory block after it's free'd by overwriting any data that used to be in the memory block upon free.
Guard edges and Guard Malloc will help you find memory overruns and (to some extent) use-after-free by read and write protecting memory blocks to make your program crash more obviously if misusing memory.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With