[llvm-dev] Custom Alloca implementation

Udit agarwal via llvm-dev llvm-dev at lists.llvm.org
Mon Jan 27 05:40:39 PST 2020

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Hi Alberto,

Thanks for your prompt reply. Actually, I need this information(about total
allocation size and object structure) on runtime, so that is why I was
planning to encode this info and store it in the memory itself.


On Mon, Jan 27, 2020 at 7:05 PM Alberto Barbaro <barbaro.alberto at gmail.com>

> Hello Udit,
> I'm not sure but can't you achieve the same just using metadata avoiding
> to change the alloca instruction?
> Thanks
> Alberto
> On Mon, Jan 27, 2020, 12:09 Udit agarwal via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>> Hello all,
>> In my project, I need to allocate an extra 4 Bytes in every Alloca
>> instruction. These additional bytes will be used to store the 'allocation
>> info'(like size and structure of the allocated object etc). Instead of
>> adding 4 bytes to the Alloca 'size' operand at every Alloca Instruction, I
>> was thinking to make this change at the level where Alloca gets converted
>> to machine IR.
>> Can anyone please point me towards the code which actually handles this
>> conversion(lowering of Alloca Inst)?
>> --
>> Regards,
>> Udit kumar agarwal
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

Udit kumar agarwal
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