# 4.4.2 数据结构 - Package

package 的数据结构定义在文件`$GCROOT/compile/internal/types2/package.go`中：

```go
type Package struct {
	path     string     // 包的引用路径，例如 import "fmt" 中的 "fmt"
	name     string     // 包名，即代码中 package xxx 声明的内容
	scope    *Scope     // 包作用域，该包的 public 符号对象都在该作用域内
	complete bool       // 如果该包的 scope 内包含了所有的 public 符号对象，则为 true, 否则为 false
	imports  []*Package // 该包的依赖
	fake     bool
	cgo      bool
}
```

包通常以对象文件（.o 或者 .a 文件）的形式存在于文件系统中，而`Package`则对应一个对象文件在编译器中的内存结构。在编译阶段，包加载器负责完成包的加载与解析，包内符号对象都在`scope`属性中，下文[包加载器](/golang-bian-yi-qi-lei-xing-jian-cha/lei-xing-jian-cha-luo-ji.md)一节会对加载逻辑做详细介绍。


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