function - LLVM IR 仪器。如何获取指针 arg 指向的元素值？

Question

我正在尝试检测 LLVM IR 调用指令。我想要实现的是获取函数调用的参数。如果参数是指针类型，那么我想获取指针指向的元素/变量。我知道如果我有论据，我可以使用

getPointerElementType to get the type of element the pointer is pointing to.

但是如何访问元素的值呢？

Answer 1

You want to

get the element/variable that pointer is pointing to

This is also called "dereferencing a pointer". This is not something you can do at compile time, but what you can do is insert an instruction which does the dereferencing - in other words, a load instruction.