func()

in tools/go-agent/instrument/agentcore/instrument.go [175:240]

• 57 lines of code
• 8 McCabe index (conditional complexity)

func (i *Instrument) writeLinkerFile(dir string) (string, error) {
	return tools.WriteFile(dir, "runtime_linker.go", tools.ExecuteTemplate(`package core

import (
	_ "unsafe"
)

//go:linkname {{.TLSGetLinkMethod}} {{.TLSGetLinkMethod}}
var {{.TLSGetLinkMethod}} func() interface{}

//go:linkname {{.TLSSetLinkMethod}} {{.TLSSetLinkMethod}}
var {{.TLSSetLinkMethod}} func(interface{})

//go:linkname {{.SetGlobalOperatorLinkMethod}} {{.SetGlobalOperatorLinkMethod}}
var {{.SetGlobalOperatorLinkMethod}} func(interface{}) 

//go:linkname {{.GetGlobalOperatorLinkMethod}} {{.GetGlobalOperatorLinkMethod}}
var {{.GetGlobalOperatorLinkMethod}} func() interface{}

//go:linkname {{.GetGoroutineIDLinkMethod}} {{.GetGoroutineIDLinkMethod}}
var {{.GetGoroutineIDLinkMethod}} func() int64

//go:linkname {{.GetInitNotifyLinkMethod}} {{.GetInitNotifyLinkMethod}}
var {{.GetInitNotifyLinkMethod}} func() []func()

//go:linkname {{.MetricsObtainMethodName}} {{.MetricsObtainMethodName}}
var {{.MetricsObtainMethodName}} func() ([]interface{}, []func())

func init() {
	if {{.TLSGetLinkMethod}} != nil && {{.TLSSetLinkMethod}} != nil {
		GetGLS = {{.TLSGetLinkMethod}}
		SetGLS = {{.TLSSetLinkMethod}}
	}
	if {{.GetGoroutineIDLinkMethod}} != nil {
		GetGoID = {{.GetGoroutineIDLinkMethod}}
	}
	if {{.SetGlobalOperatorLinkMethod}} != nil && {{.GetGlobalOperatorLinkMethod}} != nil {
		SetGlobalOperator = {{.SetGlobalOperatorLinkMethod}}
		GetGlobalOperator = {{.GetGlobalOperatorLinkMethod}}
		SetGlobalOperator(newTracer())	// setting the global tracer when init the agent core
	}
	if {{.GetInitNotifyLinkMethod}} != nil {
		GetInitNotify = {{.GetInitNotifyLinkMethod}}
	}
	if {{.MetricsObtainMethodName}} != nil {
		MetricsObtain = {{.MetricsObtainMethodName}}
	}
}
`, struct {
		TLSGetLinkMethod            string
		TLSSetLinkMethod            string
		SetGlobalOperatorLinkMethod string
		GetGlobalOperatorLinkMethod string
		GetGoroutineIDLinkMethod    string
		GetInitNotifyLinkMethod     string
		MetricsObtainMethodName     string
	}{
		TLSGetLinkMethod:            consts.TLSGetMethodName,
		TLSSetLinkMethod:            consts.TLSSetMethodName,
		SetGlobalOperatorLinkMethod: consts.GlobalTracerSetMethodName,
		GetGlobalOperatorLinkMethod: consts.GlobalTracerGetMethodName,
		GetGoroutineIDLinkMethod:    consts.CurrentGoroutineIDGetMethodName,
		GetInitNotifyLinkMethod:     consts.GlobalTracerInitGetNotifyMethodName,
		MetricsObtainMethodName:     consts.MetricsObtainMethodName,
	}))
}