# My First Language Frontend with LLVM Tutorial

http://llvm.org/docs/tutorial/MyFirstLanguageFrontend/index.html

## kaleidoscope

特点:
- 只有`float64`一种类型
- 没有类型声明
- 都是expression


## lexer

source -> tokens{code, meta}

## parser & ast

source -> lexer -> tokens -> parser -> ast

递归下降 + 操作符优先级parsing.