How Can I Get the Current Function's Name in Go for Debugging?

How To Obtain Function Names for Debugging

To enhance debugging capabilities, obtaining the current function's name is crucial. Similar to gcc's FUNCTION macro, Go provides mechanisms to retrieve this information.

Consider the following function:

func foo() {
    trace()
}

We aim to have it automatically print information such as "Entering foo()...".

The runtime package offers the necessary functionality:

import "fmt"

func trace() {
    pc := make([]uintptr, 10)  // At least one entry required
    runtime.Callers(2, pc)

    // Get the function associated with the program counter
    f := runtime.FuncForPC(pc[0])

    // Obtain the file name, line number, and function name
    file, line := f.FileLine(pc[0])
    fmt.Printf("%s:%d %s\n", file, line, f.Name())
}

In this script, Callers populates the pc slice with program counters associated with the calling functions. We then use FuncForPC to retrieve the function associated with the first program counter in the slice. Finally, FileLine provides the file name, line number, and function name, which is printed to the console.

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