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

Anurag Chakraborty via llvm-dev llvm-dev at lists.llvm.org
Tue Feb 26 08:32:04 PST 2019

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.
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