Commit Graph

27 Commits

Author SHA1 Message Date
Pedro F. Giffuni
5bfc7db451 gcc: Add support for Apple's Block extension
Block objects [1] are a C-level syntactic and runtime feature. They
are similar to standard C functions, but in addition to executable
code they may also contain variable bindings to automatic (stack)
or managed (heap) memory. A block can therefore maintain a set of
state (data) that it can use to impact behavior when executed.

This port is based on Apple's GCC 5646 with some bugfixes from
Apple GCC 5666.3. It has some small differences with the support
in clang, which remains the recommended compiler.

Perhaps the most notable difference is that in GCC that __block
is not actually a keyword, but a macro. There will be workaround
for this issue in a near future. Other issues can be consulted in
the clang documentation [2]

For better compatiblity with Apple's GCC and llvm-gcc some related
fixes and features from Apple have been included. Support for the
non-standard nested functions in GCC is now off by default.

No effort was made to update the ObjC support since FreeBSD doesn't
carry ObjC in the base system, but some of the code crept in and
was more difficult to remove than to adjust.

Reference:
[1]
https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Blocks/Articles/00_Introduction.html
[2]
http://clang.llvm.org/compatibility.html#block-variable-initialization

Obtained from:	Apple GCC 4.2
MFC after:	3 weeks
2014-01-05 00:43:28 +00:00
Ben Laurie
104c8fc527 Fix clang warnings.
Approved by:	philip (mentor)
2011-05-22 22:17:06 +00:00
Alexander Kabaev
4da6937165 Update locally changed files to GCC 4.2.1.
Approved by: re (kensmith)
2007-08-14 03:04:42 +00:00
Alexander Kabaev
f48faea4fa Merge local changes for -mprofiler-epilogue support. 2007-05-19 02:18:38 +00:00
Bruce Evans
11e27303d3 Fixed -mprofiler-epilogue. The garbage collector apparently doesn't
understand that non-local variables can never be collected, and when
it collected the static variable for mexitcount_libfunc, gcc aborted
on the next use of this variable.

This quick fix is to reinitialize the variable on every use and depend
on garbage collection recovering the small amount of memory wasted by
this, and not worry by the small amount of time wasted by this.  It
would be better to initialize the variable together with most of the
other libfuncs in optabs.c and depend on whatever magic is there to
prevent its collection, but we initialize it here to avoid taking at
least 2 more files off the vendor branch.
2006-10-25 07:29:22 +00:00
Alexander Kabaev
c3cbf7fdb9 Merge conflicts for GCC 3.4.4. 2005-06-03 04:02:20 +00:00
Alexander Kabaev
8e87f3b2bd Merge FreeBSD changes into GCC 3.4.2-prerelease.
1.19	Fix -mprofiler-epilogue on i386.
2004-07-28 04:01:01 +00:00
Bruce Evans
a36805bd93 Quick fix for breakage of non-i386 arches in previous commit. Only
use TARGET_PROFILER_EPILOGUE if it is defined.
2004-01-06 10:38:48 +00:00
Alexander Kabaev
973e839bed Fix -mprofiler-epilogue on i386. This should be extended to other
architectures in future.

Submitted by:	bde
2004-01-05 22:23:27 +00:00
Alexander Kabaev
3697be5590 No FreeBSD-local changes in these files. 2003-11-07 03:05:29 +00:00
Alexander Kabaev
b2bcf6753d FreeBSD uses stock versions of these GCC files. 2003-07-11 04:00:23 +00:00
Alexander Kabaev
d79e61dc75 Update HEAD with stock GCC 3.2.2 release files. 2003-02-10 05:57:03 +00:00
David E. O'Brien
4f471064d9 Update HEAD with FSF branch 3.2.1 release files. 2002-12-04 16:35:55 +00:00
David E. O'Brien
21da7e2bd7 Use pure stock files. 2002-12-04 16:31:48 +00:00
David E. O'Brien
f685377c2e Remove our custom mixed ELF/a.out support. This means the base compiler
now only produce ELF objects.  It also makes us closer to stock GCC, and
simplifies the set of changes we still need from stock GCC on every import.

Applauded by:	peter
Approved by:	re
2002-11-26 18:25:20 +00:00
Alexander Kabaev
ec748e0ef8 Merge FreeBSD modifications into gcc 3.2.1-prerelease:
1.2 a.out support

Approved by:	obrien
2002-09-01 21:02:41 +00:00
David E. O'Brien
6a38fe7c3a Merge rev 1.2 (a.out support) into the GCC 3.1 prerelease. 2002-05-09 21:44:15 +00:00
David E. O'Brien
588c983274 Merge rev 1.2 (a.out support) into GCC 3.1-snap. 2002-02-01 19:42:45 +00:00
David E. O'Brien
0e907ffc9a Merge gcc-2.95.3-test3 changes onto mainline. Bump FreeBSD cc version. 2001-02-17 08:35:00 +00:00
David E. O'Brien
f0ae320070 Merge gcc.2.95.3-test1 changes onto mainline 2001-01-03 17:17:01 +00:00
David E. O'Brien
507f261243 Fix conflicts. 2000-05-27 02:43:50 +00:00
David E. O'Brien
8364821558 Merge rev 1.2 (a.out support) into GCC 2.95.2. 1999-11-01 18:56:02 +00:00
David E. O'Brien
b2d5bd75c2 Merge rev 1.2 (a.out support) into GCC 2.95.1. 1999-10-26 08:53:03 +00:00
David E. O'Brien
f269f9df8d Grrrrr. Put the $FreeBSD$ in a Bad Place. 1999-10-15 21:49:40 +00:00
David E. O'Brien
46e3c32617 Merge rev 1.2 (a.out support) into EGCS 1.1.2. 1999-10-15 20:48:35 +00:00
Peter Wemm
9cb13c2344 First round of changes to support generation of assembler for the old
a.out gas and the binutils gas (elf or a.out) with a single compiler.

This uses other infrastructure not yet committed, in order to support
both a.out and elf it needs to be able to get to both a.out and elf
gas, ld, libs, crt* etc.  So for now, the support is pretty much dormant.

The new freebsd.h file is based on the old freebsd-elf.h file (which has a
long lineage, right back through linux and svr4 files).  The change is
pretty dramatic from a gcc internals standpoint as it overrides a lot of
definitions in order to generate different output based on target mode.
There is potential for screw-ups, so please be on the lookout - gcc's
configuration mechanism wasn't really meant for this kind of thing.
It's believed to compile world etc just fine under both a.out and elf, can
handle global constructors and destructors, handles the differences in
a.out and elf stabs, and what sections things like exceptions go in.

The initial idea came from i386/osfrose.h which is a dual rose/elf format
target.  These two are not as diverse as a.out and elf it would seem.

The cc front-end uses external configuration to determine default object
format (still being thrashed out, so read the source if you want to see
it so far), and has a '-aout' and '-elf' override command line switch.
There are some other internal switches that can be accessed, namely -maout,
-mno-aout, -munderscores and -mnounderscores.  The underscore and local
symbol prefixing rules are controllable seperately to the output format.
(ie: it's possible to generate a.out without the _ prefixes on symbols and
also to generate elf with the _ prefixes.  This isn't quite optimal, but
does seem to work pretty well, except the linkers don't always recognise
the local symbols without their normal names)

The default format is a.out (still), nobody should see any major changes.

With both elf and a.out tools and libraries installed:

[1:26pm]/tmp-223> cc -elf -o hello hello.c
peter@beast[1:27pm]/tmp-224> file hello
hello: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD), dynamically linked, not stripped
[1:27pm]/tmp-225> ./hello
hello world!

[1:27pm]/tmp-226> cc -aout -o hello hello.c
[1:27pm]/tmp-227> file hello
hello: FreeBSD/i386 compact demand paged dynamically linked executable not stripped
1:27pm]/tmp-228> ./hello
hello world!

Since my co-conspirators put a lot of effort into this too, I'll add them
so they can share the blame^H^H^H^H^Hglory. :-)

Reviewed by: sos, jdp
1998-03-08 05:29:49 +00:00
Peter Wemm
a4cd5630b0 Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the
non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.

gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.

The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.
1996-09-18 05:35:50 +00:00