A portable Objective-C runtime written in C11. No Assembler required. It follows the Apple "Objective-C 1 Runtime" and adds many features from "Objective-C 2.0", but the function calls are completely different. It is designed to be suitable for massive multi-threading.
|Fork||Build Status||Release Version|
What's so different ?
Runtime objects (like classes and selectors) are not referenced by name, but by a unique ID. No special linker action required.
Parameters outside of
_cmdare passed via
_param, a single pointer to a struct. This simplifies a lot of code, especially forwarding code. Return values are also returned with the same struct. Optimizations are done for simple methods with only none or one parameter and none or one return value.
It uses inlineable method calls for superior performance. The user can specify "fast" classes and "fast" methods for extra speed in performance critical cases.
releasesemantics are built in. These are non-overridable, which makes them a lot faster.
isais not part of the instance, but instead prefixed to the instance.
Protocolas a type and an object does not exist anymore.
No global lock. The runtime only locks during
+initializeon a per class basis
Protections against the fragile base class problem
Multiple runtimes can coexist.
How to use it
If you haven't used an Objective-C runtime before, it is useful to get to know the much better documented "Mac OS X Objective-C 1.0" runtime first. Intro to the Objective-C Runtime could be a good starting point.
||Deal with Classes|
||Install Classes, Categories, Methods, Strings into the runtime|
||Deal with Methods|
||Deal with Instances|
||Work with the runtime|
|Global Functions||Global functions and conveniences|
|Vararg extensions||Dealing with variable arguments|
These articles give you some background about the mulle-objc runtime:
- mulle-objc: a new Objective-C runtime
- mulle-objc: a meta calling convention
- mulle-objc: removing superflous ifs
- mulle-objc: inlined messaging
- mulle-objc: some research about selectors
- mulle-objc: hashes for classes, selectors and protocols
- mulle_objc: object layout, retain counting, finalize
- mulle_objc: inheriting methods from protocols
- mulle_objc: present and absent language features
- mulle_objc: the trouble with @property
- mulle_objc: ivar layout with @property
- mulle_objc: technically speaking
If something is unclear, feel free to contact the author.
brew install mulle-objc/software/mulle-objc-runtime
On other platforms you can use mulle-install from mulle-build to install the library:
mulle-install --prefix /usr/local --branch release https://github.com/mulle-objc/mulle-objc-runtime