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Re: Systemtap's DTRACE_PROBE and clang
- From: Josh Stone <jistone at redhat dot com>
- To: Martin Martin <martin at infinio dot com>
- Cc: "Frank Ch. Eigler" <fche at redhat dot com>, systemtap at sourceware dot org
- Date: Fri, 20 Sep 2013 14:27:52 -0700
- Subject: Re: Systemtap's DTRACE_PROBE and clang
- Authentication-results: sourceware.org; auth=none
- References: <CAAQ0mPj9t_TtzsnoaNPO5U8sTtfg2NQYjEzkZUwP3P7q5_dE7Q at mail dot gmail dot com> <y0mtxhfjp48 dot fsf at fche dot csb> <523CA9CB dot 7020807 at redhat dot com> <CAAQ0mPja9Sj_+NyNkzydo5u8kMdBR2raZ87790RbqRUcTzgiYw at mail dot gmail dot com>
On 09/20/2013 01:26 PM, Martin Martin wrote:
> You also need % for the other section in sys/sdt.h, progbits, and then it works!
In my brief attempt, it appears that GCC *doesn't* want that escaped to
%%progbits - I guess because there are no operands to expand in that
particular asm statement? Is that true for clang too?
>
> On Fri, Sep 20, 2013 at 4:02 PM, Josh Stone <jistone@redhat.com> wrote:
>> On 09/20/2013 11:59 AM, Frank Ch. Eigler wrote:
>>>
>>> martin wrote:
>>>
>>>> [...]
>>>> How onerous is it to change the code here? [...]
>>>> Workaround for now, it does work if you change it to:
>>>> .pushsection .note.stapsdt,"?",@note
>>>
>>> I don't recall any deep discusson on that topic. It could be
>>> just to immunize it from being misinterpreted as a comment
>>> (see the @-comment-on-arm line on the same AS doc page).
>>
>> Based on that, I'm experimenting with %note instead. It's a little more
>> complicated since that has to be escaped to %%note for C probes, but not
>> escaped for probes in pure ASM source files. But that's just an #ifdef
>> __ASSEMBLER__, and so far this seems to work.
>>
>> I'd appreciate if you can confirm it with your "?"-patched clang.
>>
>> Thanks,
>> Josh