[Stackless] Problem building release27-maint in 64-bit linux.

Alexey Borzenkov snaury at gmail.com
Wed Oct 26 08:05:18 CEST 2011

Hello, Anselm,

Glad to see you working on stackless. You might be interested that I
also fixed similar problems for greenlet on other platforms, see the
following bug reports for references:

- i386 https://bitbucket.org/snaury/greenlet/issue/2/fix-register-saving-on-i386
- arm32 https://bitbucket.org/ambroff/greenlet/issue/31/segfault-in-tests-on-arm

While i386 is not particularly important (I don't think configuration
like that is really used in the wild), since at least one person
stumbled upon it with greenlet it probably needs to be fixed in
stackless too.

On Mon, Oct 24, 2011 at 3:30 PM, Anselm Kruis
<a.kruis at science-computing.de> wrote:
> Hello,
> finally I found some time for stackless. We still have to problem with the
> AMD64 code, that does not compile on Linux.
> Meanwhile there was a little progress:
> - I had access to an OS-X system and was able to successfully test my patch.
> - I simplified the patch. It does not depend on the -fomit-frame-pointer /
> -fno-omit-frame-pointer flags any more. The price is a little overhead, if a
> frame pointer is used. Thanks to Alexey Bronzenkov.
> - I also improved the comments in the patch, because I got the impression
> that some people didn't understand the concept of the patch fully.
> Now, that the patch has been tested on Linux and OS-X I kindly ask to apply
> this patch.
> Regards
>  Anselm
> Am 18.08.2011 15:18, schrieb Jeff Senn:
>> Anselm - can you have a look and see what you think of Alexey's version?
>> Compare with your earlier proposal?  What is you current best version for
>> me to test on OS-X
>> (preferably w/o the darwin specific compile option which I can't tell if
>> you
>> thought was necessary or not...)
>> FWIW: My problem with the 32-bit version does seem to have something to do
>> with the llvm version of gcc on Lion... putting a useless (but not
>> optimize-away-able)
>> statement directly after the call to slp_switch that refers to cst and
>> cstprev
>> causes it to work again... so I suspect either some sort of "bug"
>> in code generation -- or an optimization that breaks the stack
>> switching...
>> if this sounds familiar to anyone (before I have time to go rip apart and
>> analyze
>> the object code -- which will be awhile), please let me know...
>> On Aug 17, 2011, at 6:09 PM, Alexey Borzenkov wrote:
>>> On Fri, May 6, 2011 at 7:27 PM, Estevo<euccastro at yahoo.com>  wrote:
>>>> I got the following error trying to make release27-maint in a 64-bit
>>>> gcc -pthread -c -fno-strict-aliasing -DSTACKLESS_FRHACK=0 -g -O2
>>>> -DNDEBUG -g
>>>> -fwrapv -O3 -Wall -Wstrict-prototypes  -I. -IInclude -I./Include
>>>> -I./Stackless
>>>> -DPy_BUILD_CORE -fno-omit-frame-pointer -O2 -I. -o
>>>> Stackless/core/slp_transfer.o
>>>> ./Stackless/core/slp_transfer.c
>>>> ./Stackless/core/slp_transfer.c: In function ‘slp_transfer’:
>>>> ./Stackless/core/slp_transfer.c:153:1: error: bp cannot be used in asm
>>>> here
>>>> make: *** [Stackless/core/slp_transfer.o] Erro 1
>>> While working on greenlet and fixing switch-related problems, I found
>>> that I cornered myself into the same issue with gcc (as opposed to
>>> llvm-gcc used on OS X Lion). It seems that for whatever reasons gcc
>>> doesn't allow clobbering rbp when it's using it for referencing stack
>>> frame.
>>> Coincidentally I managed to find a way to correctly save rbp (as well
>>> as csr and cw), that works and compiles both with and without
>>> -fomit-frame-pointers. In anyone is interested you can find my
>>> slp_transfer for amd64 here:
>>> https://bitbucket.org/snaury/greenlet/src/5d37cde9474c/platform/switch_amd64_unix.h
>>> If anyone can verify it's 100% correct (though redundant), then you
>>> can maybe use it in stackless too.
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