Go-深入理解go程序运行和编译

package main

import "fmt"

func main(){
    fmt.Println("Hello World!")
}

/tmp/go-build992497858/b001/
├── exe
│   └── main    // 可执行文件
├── importcfg   // import config
├── importcfg.link  // 链接器
└── _pkg_.a       // 归档文件

func osinit() {
	ncpu = getproccount()
}

func schedinit() {
	// raceinit must be the first call to race detector.
	// In particular, it must be done before mallocinit below calls racemapshadow.
	// 获取当前g
  _g_ := getg()
	if raceenabled {
		_g_.racectx, raceprocctx0 = raceinit()
	}
  // 最大线程数量
	sched.maxmcount = 10000

	tracebackinit()
  moduledataverify()
  // 栈初始化
	stackinit()
	mallocinit()
	mcommoninit(_g_.m)
	cpuinit()       // must run before alginit
	alginit()       // maps must not be used before this call
	modulesinit()   // provides activeModules
	typelinksinit() // uses maps, activeModules
	itabsinit()     // uses activeModules

	msigsave(_g_.m)
	initSigmask = _g_.m.sigmask

	goargs()
	goenvs()
	parsedebugvars()
	gcinit()

	sched.lastpoll = uint64(nanotime())
	procs := ncpu
	if n, ok := atoi32(gogetenv("GOMAXPROCS")); ok && n > 0 {
		procs = n
	}
	if procresize(procs) != nil {
		throw("unknown runnable goroutine during bootstrap")
	}

	// For cgocheck > 1, we turn on the write barrier at all times
	// and check all pointer writes. We can't do this until after
	// procresize because the write barrier needs a P.
	if debug.cgocheck > 1 {
		writeBarrier.cgo = true
		writeBarrier.enabled = true
		for _, p := range allp {
			p.wbBuf.reset()
		}
	}

	if buildVersion == "" {
		// Condition should never trigger. This code just serves
		// to ensure runtime·buildVersion is kept in the resulting binary.
		buildVersion = "unknown"
	}
}