issue21879.go

     1  // run
     2  
     3  // Copyright 2017 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import (
    10  	"runtime"
    11  )
    12  
    13  func main() {
    14  	println(caller().frame.Function)
    15  
    16  	// Used to erroneously print "main.call.name" instead of
    17  	// "main.main".
    18  	println(caller().name())
    19  }
    20  
    21  func caller() call {
    22  	var pcs [3]uintptr
    23  	n := runtime.Callers(1, pcs[:])
    24  	frames := runtime.CallersFrames(pcs[:n])
    25  	frame, _ := frames.Next()
    26  	frame, _ = frames.Next()
    27  
    28  	return call{frame: frame}
    29  }
    30  
    31  type call struct {
    32  	frame runtime.Frame
    33  }
    34  
    35  func (c call) name() string {
    36  	return c.frame.Function
    37  }
    38
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