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This article mainly introduces "how to use linkname in go". In daily operation, I believe many people have doubts about how to use linkname in go. Xiaobian consulted all kinds of materials and sorted out simple and easy operation methods. I hope to help you answer the doubts about "how to use linkname in go"! Next, please follow the small series to learn together!

Go: Use of linkname

In the go language source code, you will find a lot, the code only function signature, but do not see the function body, such as:

// src/os/proc.go 68 lines func runtime_beforeExit() // implemented in runtime

Here we only see the function signature, but not the function body, global search, found that its function body is defined in src/runtime/proc.go

// os_beforeExit is called from os.Exit(0).// go:linkname os_beforeExit os.runtime_beforeExitfunc os_beforeExit() { if raceenabled { racefini() }}

It connects the function signature and the function body together via go:linkname. So can we do that in code? Since we can use this in library functions, can we use it in our own code structure? The following is a step-by-step implementation of this usage through experimentation

Create a project catalog

$mkdir demo && cd demo

go mod Initialize project directory

$go mod init demo

Create function signature pkg and function body pkg

$mkdir hello$mkdir link

write tests

$cd hello//function signature $vim hello.gopackage helloimport ( _ "demo/link")func Hello()//function body $vim link.gopackage linkimport _ "unsafe"//go:linkname helloWorld demo/hello.Hellofunc helloWorld() { println("hello world! ")}

execute code

$cd demovim demo.gopackage mainimport ( "demo/hello")func main() { hello.Hello()}

compile and run

go run demo.go# demo/hellohello/hello.go:7:6: missing function body

Add the aa.s assembly file tag under the hello folder, and you can execute it through compilation

$cd hello && touch aa.s$go run demo.gohello world! At this point, the study of "how to use linkname in go" is over, hoping to solve everyone's doubts. Theory and practice can better match to help you learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

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