举例

String的Array

(lldb) x/10gx 0x0000000280c2e2c0
0x280c2e2c0: 0x00000001efe3c008 0x0000000000000003
0x280c2e2d0: 0x0000000000000002 0x0000000000000004
0x280c2e2e0: 0x0000656e6f687069 0xe600000000000000
0x280c2e2f0: 0x0000000069626d73 0xe400000000000000
0x280c2e300: 0x00000001efdf52d0 0x7fffffff7fffffff
(lldb) po 0x00000001efe3c008
_TtGCs23_ContiguousArrayStorageSS_$
(lldb) p/c 0x0000656e6f687069
(long) iphone\0\0
(lldb) p/c 0x0000000069626d73
(int) smbi

->

• Array的内存布局=字段
  • HeapMetadata* metadata
    • 0x00000001efe3c008
      • _TtGCs23_ContiguousArrayStorageSS_$
        • String的Array
  • int64 refCount
    • 0x0000000000000003
  • int64 count
    • 0x0000000000000002
  • int64 _capacityAndFlags
    • 0x0000000000000004
  • 第一个 = [0x280c2e2e0]
    • 0x0000656e6f687069 0xe600000000000000
      • "iphone"
  • 第二个 = [0x280c2e2f0]
    • 0x0000000069626d73 0xe400000000000000
      • "smbi"