FUNCTION_PROFILER means I am going to write my own profiler and not rely on
gprof /( mcount ), unfortunately, the we need to use gprof output because
It would be used later for link time code optimization step, so we are bound
with -pg switch and mcount.
It looks like the only way to solve this problem is to fix gcc, is this
correct?
Thanks
--------------------------------------------------
From: "Ian Lance Taylor" <iant@xxxxxxxxxx>
Sent: Tuesday, December 22, 2009 2:59 PM
To: "Muhammed Fawzy" <mfawzymkh@xxxxxxxxxxx>
Cc: <gcc-help@xxxxxxxxxxx>
Subject: Re: DEFAULT_CALLER_SAVES doesn't work on the mac
"Muhammed Fawzy" <mfawzymkh@xxxxxxxxxxx> writes:
I see, so even writing a plugin to alter the instruction stream
wouldn't help?
In this case, probably not. The call to mcount is generated very
late.
is it possible to have a flag for gcc to store registers around mcount
calls - through a patch or something, right now apple implementation
for mcount doesn't store registers - except for ebx, esi , and edi,
which technically render the -pg switch broken when profiling fast
call functions, where arguments are passed in ecx and edx
any help regarding this issue is REALLY appreciated.
Sure, that is possible.
Look for FUNCTION_PROFILER in the relevant backend.
Ian
