How Can I Get a Go Function's Name at Runtime?

How to Retrieve Function Names in Go

It is often desirable to obtain the name of a function in Go during runtime. This can be useful for debugging purposes, logging, or other metaprogramming tasks.

runtime.FuncForPC: A Native Solution

Go provides a built-in function, runtime.FuncForPC, that can retrieve the name of a function given its PC (Program Counter) address. However, it requires reflection to obtain the PC address, which can be cumbersome.

A Simplified Approach

To simplify the process, a straightforward solution using reflect and runtime.FuncForPC can be implemented:

package main

import (
    "fmt"
    "reflect"
    "runtime"
)

func foo() {
}

func GetFunctionName(i interface{}) string {
    return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
}

func main() {
    fmt.Println("name:", GetFunctionName(foo))
}

This function accepts a generic interface parameter i and returns the name of the function associated with that interface. In this case, foo is the function whose name is being retrieved.

Example Usage

The following example demonstrates the usage of the GetFunctionName function:

package main

import (
    "fmt"
)

func foo() {
}

func main() {
    fmt.Println("name:", GetFunctionName(foo))
}

When you run this program, it will output:

name: foo

This confirms that the GetFunctionName function successfully retrieves the name of the foo function.

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