[DynInst_API:] getType() for Expression/InstructionAPI?

[Wei Ming Khoo <weimzz@xxxxxxxxx>]

Hi,

I'm trying to extract 4 pieces of information from a disassembly (assume 32bit x86 for now): mnemonic, number of operands, operand (register, memory reference, immediate value), and operation width (8/16/32 bit).

I got as far as

Instruction::Ptr insn;

...

Operation operation = insn->getOperation();

std::vector<Operand> operands;

insn->getOperands(operands);

for (int i=0; i<operands.size(); i++){

            _expression_::Ptr expr;

            expr = insn->getOperand(i).getValue();

            std::vector<_expression_::Ptr> children;

            expr->getChildren(children);

            printf("%s %d ", expr->format().c_str(), children.size() );

}

Here's where I got stuck. How do I distinguish between a register, memory reference and an immediate? An ugly hack would be look at the expr->format().c_str() string to decide, but I was wondering if there was a more elegant way to do this?

Regards,

--wm