Get name of function using reflection

Question

I\'m trying to use Go\'s reflection system to retrieve the name of a function but I get an empty string when calling the Name method on its type. Is this the expected behavi

Answer 1

import runtime

func funcName() string {
    pc, _, _, _ := runtime.Caller(1)
    nameFull := runtime.FuncForPC(pc).Name()    // main.foo
    nameEnd := filepath.Ext(nameFull)           // .foo
    name := strings.TrimPrefix(nameEnd, ".")    // foo
    return name
}

Answer 2

The solution is to use FuncForPc which returns a *Func.

This returns "main.main" :

package main

import "fmt"
import "reflect"
import "runtime"


func main() {
    name := runtime.FuncForPC(reflect.ValueOf(main).Pointer()).Name()
    fmt.Println("Name of function : " + name)
}

If you want "main", just tokenize it.

Answer 3

package main

import "fmt"
import "runtime"

func main() {
    pc, _, _, _ := runtime.Caller(0)
    fmt.Println("Name of function: " + runtime.FuncForPC(pc).Name())
    fmt.Println()

    // or, define a function for it
    fmt.Println("Name of function: " + funcName())
    x()
}

func funcName() string {
    pc, _, _, _ := runtime.Caller(1)
    return runtime.FuncForPC(pc).Name()
}

func x() {
    fmt.Println("Name of function: " + funcName())
    y()
}

func y() {
    fmt.Println("Name of function: " + funcName())
    z()
}
func z() {
    fmt.Println("Name of function: " + funcName())
}

Output:

Name of function: main.main

Name of function: main.main
Name of function: main.x
Name of function: main.y
Name of function: main.z