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Portable Object Compiler (c) 1997-2023. All Rights Reserved.
GETTING HELP
------------
For help and reporting bugs : send email to me (stes@telenet.be)
or to the objc-discuss@lists.sourceforge.net mailing list.
Subscribe to the mailing list at https://sourceforge.net/p/objc/mailman/
INSTALL
-------
Read the Install.txt file.
If this is a first-time installation, you have to start by installing a bootstrap package; do not install this package until you have installed a bootstrap package. This can be either a binary package of the Portable Object Compiler, or in some cases when no binary "port" exists an objc-bootstrap.tar.gz source package.
LICENSE
-------
Read the License.txt file (the "GNU Library General Public License").
The license file explains the difference between,
(a) "software using the Portable Object Compiler", and
(b) "software based upon the Portable Object Compiler".
LATEST VERSION
--------------
The latest sources of the Portable Object Compiler are available at:
https://sourceforge.net/projects/objc/
WHAT'S INCLUDED
---------------
The "objc" distribution consists of the following parts :
0. "VICI", interactive Objective-C debugger and interpreter
It doesn't currently work but may be an interesting project for someone.
1. "objc", the actual compiler
Consists of driver script ("objc") and binary ("objc1").
"objc1" is a precompiler for C.
The binary "postlink" is used
for preparing tables for runtime initialization.
2. "objcrt", the Objective C Runtime Library for "objc"
This is a modern, portable, "all C" Objective C runtime
There's absolutely no assembly language needed, nor is there
a dependency on stack layout, register allocation conventions etc.
The runtime and compiler support using the frame pointer,
as a general purpose register (as in the x64 ABI, for instance).
Portable Object Compiler supports builds with "noframeptr" so that
an optimizer can use the frame pointer as a general purpose register.
Most other runtimes, were derived from pre-"all C"-Stepstone
runtimes, so this is an important point of difference.
3. "objpak", the "Object Pak" Objective C Collection Classes
Simple, powerful set of classes. Very portable.
Can be used to develop with different compilers, then
port with 'objc'. Compatible with ICpak101, the collection class
library described in Brad Cox book, and used by existing
Objective-C packages that were developed with Stepstone objc.
4. "cakit", the "Computer Algebra Kit" Objective C classes
Small, concise, interface to a large set of classes for
polynomial computing and arbitrary precision integer arithmetic.
5. Source of compiler and "oclib", a set of Objective C classes for
parsing C (and the Objective C extensions to C)
"objc" and "vici" are written in Objective C itself. It's all
written in portable Objective C : any Objective C compiler
should be able to compile the "objc" compiler. From time to time,
we try a configure with other Objective-C compilers, to ensure that our
sources are still compatible with e.g. Stepstone Objective C compiler.
NOT included is a C compiler : in order to be able to use "objc", you will
need to elsewhere find a compatible C compiler. This should be no problem
since one of our goals - see below - is to make "objc" work with as many C
compilers as possible. On UNIX systems, the (free) "gcc" compiler is a
possibility (not needed, but possible). Another possibility, is to use
the (free) "lcc" compiler or the "tcc" TDF compiler system.
NICE FEATURES
-------------
1.Easy to install or to modify.
2.Works on many systems with the native cc, debugger, profiler etc.
(Unix, Windows, Macintosh, Beos, OpenVMS etc. see Platforms.txt file)
2a. Option for auto reference counted memory management (-refcnt).
This uses the native malloc(), free() etc. but the compiler generates
statements for keeping track of references.
(Tested on a few platforms, such as IRIX 5.2 with the SGI malloc).
3.Built-in possibility of tracing Objective C messages. (OBJCRTMSG)
4.Straightforward "C" messenger; "inline cache" messenger.
Forwarding C messenger (to support -doesNotUnderstand:).
5.All classes get a +initialize message at start-up, rather than
'each class receives a +initialize before it receives its first
message'.
6.Some support for translating Objective-C to Smalltalk (-st80 option)
7.Automatic archiver. Compiler generates code for classes to save
and load objects to and from disk (for all instance variables of
type "id").
8.Option for Garbage Collection (using Boehm gc package).
Option for automatic reference counted memory management
(doesn't require Boehm).
9.Exception handling scheme (using Objective-C Blocks) that allows
to specify a default handler to be executed.
10.Supports dynamically loading Objective-C modules on Windows,
FreeBSD, HP-UX, Solaris, Linux, IRIX, Digital Unix etc.
11.Has a switch for double indirection for Object identifiers (id as
a handle instead of a pointer). (-become: method)
12.Supports forwarding messages (-doesNotUnderstand: method)
13.Support for Embedded SQL in Objective-C (Informix only for now)
14.Great system for experimentation with your own additions/extensions
to Objective C !
WANT TO HELP?
-------------
If you like "objc", feel free to send e-mail to, "stes@pandora.be".
I'm especially interested in bug-fixes, of course. And in ports
to machines that I don't have access to (e.g. CP/M, Atari).