[LLVMdev] want to intercept array dereferences

[Gry Gunvor]

Ok, sounds like you are saying it would be a flaky solution.
Gry


On Tue, Apr 7, 2015 at 11:56 PM, Jeremy Lakeman
<Jeremy.Lakeman at gmail.com> wrote:
> You might be able to match the GEP + load pair and replace with a call.
> But, it would depend entirely on how the llvm instructions were generated
> and what optimisations have been run.
>
> On Wed, Apr 8, 2015 at 3:54 PM, Gry Gunvor <gry.gunvor at gmail.com> wrote:
>>
>> If I understand correctly, LLVM is a *typed* assembly language.  Could
>> I just look for a pointer type plus an integer type followed by a
>> dereference?  That would catch both a[n] and *(a+n).
>> Gry
>>
>>
>> On Tue, Apr 7, 2015 at 10:46 PM, Bruce Hoult <bruce at hoult.org> wrote:
>> > Far too late. That would need to be in Clang.
>> >
>> > On Wed, Apr 8, 2015 at 5:36 PM, Gry Gunvor <gry.gunvor at gmail.com> wrote:
>> >>
>> >> Normally for int n unknown at static time, "a[n]" and "*(a+n)" results
>> >> in an add and then a dereference.  I want instead for it to compile to
>> >> a system call that takes two arguments, a and n.  Where should I
>> >> intercept this in LLVM?
>> >>
>> >> Gry
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