[llvm-dev] LLVM pass to track memory usage by a program

Alberto Barbaro via llvm-dev llvm-dev at lists.llvm.org
Tue Feb 26 09:24:25 PST 2019

Hi Anurag,
I assume you would like to have the moment traced at real-time during a
real execution. Wouldn't better to rely on the Interpreter class and
relying on the various visit methods?


On Tue, Feb 26, 2019, 16:32 Anurag Chakraborty via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
> I am trying to write an llvm pass, that detects whether any instruction is
> allocating,reading or writing to memory. If it is doing so, I extract the
> address of that memory location, and identify the next time, this memory
> location is again accessed.
> For this, I am iterating over the .ll IR file generated from the program,
> and using mayReadOrWriteMemory() to check whether any memory access is
> being made (for alloca instructions, I am just checking separately). If
> there is an access then, I iterate over the operand list using op_begin()
> and op_end() to get the memory address. But so far, I have been getting
> some ambiguous results.                                        Is my
> approach wrong ? Could someone please help me out here.
> Thanks
> Anurag
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