# 10.3 导出对象文件

将编译结果导出为对象文件是编译的最后一步，该文件是编译器的输出，链接器的输入。该逻辑在编译器主函数的尾部：

```go
// file: cmd/compile/internal/gc/main.go

func Main() {
    // 忽略之前代码

    // 导出编译结果到磁盘
    base.Timer.Start("be", "dumpobj")
    dumpdata()
    base.Ctxt.NumberSyms()
    dumpobj()
    if base.Flag.AsmHdr != "" {
        dumpasmhdr()
    }
}
```

可以通过编译参数 `-o` 指定导出的文件名，默认情况下与编译的文件名或包名一致。例如将下列内容保存为 `main.go`:

```go
package main

func sum(i, j int) int {
    return i + j
}
```

通过命令 `go tool compile -G=3 main.go` 得到编译输出文件 `main.o`.

对于编译得到的结果，可以通过命令 `go tool objdump` 查看，使用 `go tool objdump main.o` 可以得到如下结果：

> ```
> TEXT “”.sum(SB) 
> main.go:4		0x2fa			488b442410		MOVQ 0x10(SP), AX	
> main.go:4		0x2ff			488b4c2408		MOVQ 0x8(SP), CX	
> main.go:4		0x304			4801c8			ADDQ CX, AX		
> main.go:4		0x307			4889442418		MOVQ AX, 0x18(SP)	
> main.go:4		0x30c			c3			RET
> ```


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