LLVM

最初是 Low-Level Virtual Machine 的简称，后来成为独立的名称。

设计思想：Modular and Reusable

Intermediate Representation, IR

LLVM IR: 带有类型的、介于高级程序设计语言与汇编语言之间

• A function is composed of several basic blocks
• A basic block is composed of several instructions