Xcode debugger LLDB

LLDB is a dynamic debugger for Xcode: xcode supports directives:

  • Print, p: print

  • Po: Print object:

  • Read memory:

    Format: x is hexadecimal, f is floating point, d is decimal

    Byte size: B :byte 1 byte, H :half word 2 bytes W: Word 4 bytes, G :giant word 8 bytes

    • Memory Read/Data format Number of bytes Memory address

    • X/Data format Number of bytes Memory address

    • X: Reads memory

    • 3: outputs 3 bytes

    • X: output hexadecimal

    • G: None of the strings point to 16 bytes

A peek into the underlying implementation of iOS — the nature of OC objects (I) — Digging gold

A peek into the underlying implementation of iOS — the nature of OC objects (II) — Digging gold

Look at the underlying implementation of iOS –OC object classification: instance, class, META -calss object ISA and Superclass – nuggets

A peek into the underlying implementation of iOS — the essence of KVO/KVC — nuggets