[LLVMdev] Getting started with LLVM Passes

[Sean Peisert]

Chris,

I've now figured out how to track and single out specific  
instructions, which was ridiculously easy.  Thanks!

I'm now on to trying to find more detail about those instructions,  
such as the values and addresses of the operands in memory (or, in  
the case of operands which are pointers, trying to get the pointer  
values, addresses, and values stored at location specified by the  
pointer values, etc..).

Would you suggest having LLVM add code after each instruction to get  
this, or is there another way to do this?  I've tried writing some  
code, as follows (where i is an inst_iterator, but the results are  
not what I would have expected:

for (User::op_iterator j = i->op_begin(), f = i->op_end(); j != f; + 
+j) {
     std::cerr << "Operand: " << (j->getUser())->getOperand(0) << "\n";
}

or

for (User::op_iterator j = i->op_begin(), f = i->op_end(); j != f; + 
+j) {
     std::cerr << "Operand: " << j << "\n";
}

Thanks,
Sean