[LLVMdev] Dereference PointerType?

[Daniel Waterworth]

Hello,

I'm wondering if it's possible to dereference a PointerType. I have an
AllocaInst and although I can find the number of elements allocated, (using
Instruction::getOperand(0)), I can't find a way to get the size of each
element. What I'd like to do is:

AllocaInst *alloca;

PointerType *ptr_type = dynamic_cast<PointerType*>(alloca);
assert(ptr_type);
Type *allocated_type = ptr_type->dereference(); // this is the operation
that doesn't seem to exist.
size_t size;
if (isa<PointerType>(allocated_type)) {
  size = sizeof(void*) * 8;
} else {
  size = allocated_type->getPrimitiveSizeInBits();
}
// size now equals the size (in bits) of the type allocated

If it doesn't exist, how do you manage without it? Is there another way to
write the above code?

Thanks,

Daniel
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