categories were optimized by dyld.

< 5.

5.X.

class properties in category_t.

image compiled for a simulator platform.

The size is bits 2 through 16 of the entsize field The low 2 bits are uniqued/sorted as above.

image is from an optimized shared cache.

dyld (not the shared cache) optimized this.

must never be set by compiler.

must never be set by compiler.

Bits 0..15 are reserved for Swift's use.

must never be set by compiler.

image requires GC.

class has attributeClassRoFlags = (objc_exception): OBJC_EHTYPE_$_ThisClass is non-weak.

class does not allow associated objects on instances.

class is in an unloadable bundle - must never be set by compiler.

class is unrealized future class - must never be set by compiler.

class has .cxx_destruct but no .cxx_construct ClassRoFlags = (with RO_HAS_CXX_STRUCTORS).

class has .cxx_construct/destruct implementations.

class has +load implementation.

class has ro field for Swift metadata initializer callback.

class is not ARC but has ARC-style weak ivar layout.

class has visibility=hidden set.

class compiled with ARC.

class is a metaclass.

class is realized - must never be set by compiler.

class is a root class.

class_ro_t pointers are signed.

image supports GC.

2 byte Swift stable ABI version number.

1 byte Swift unstable ABI version number.

Category represents an Objective-C category.

CFString object in a 64-bit MachO file.

CFString64Type object in a 64-bit MachO file.