How to Obtain the Name of a Function Using Go Reflection?

Understanding Reflection in Go: Retrieving Function Names

In Go's reflection system, retrieving the name of a function is not as straightforward as it may seem. The expected behavior, in certain scenarios, is to obtain an empty string when calling Name method.

Unexpected Empty String:

When using the following code snippet, the Name method returns an empty string:

package main

import "fmt"
import "reflect"

func main() {
    typ := reflect.TypeOf(main)
    name := typ.Name()
    fmt.Println("Name of function: " + name)
}

In this example, we attempt to retrieve the name of the main function using reflection. However, the output reads "Name of function: ," indicating an empty name.

Solution using runtime.FuncForPC:

The key to resolving this issue lies in utilizing the runtime.FuncForPC function. This function returns a pointer to a Func type, which provides additional information about the function, including its name.

package main

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

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

Now, the result will be "main.main," which accurately reflects the name of the function. If you wish to extract only the function name without the package name, you can split the string using the strings.SplitN function.

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