issue29735.go

     1  // run
     2  
     3  // Copyright 2019 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  // Make sure FuncForPC won't panic when given a pc which
     8  // lies between two functions.
     9  
    10  package main
    11  
    12  import (
    13  	"runtime"
    14  )
    15  
    16  func main() {
    17  	var stack [1]uintptr
    18  	runtime.Callers(1, stack[:])
    19  	f() // inlined function, to give main some inlining info
    20  	for i := uintptr(0); true; i++ {
    21  		f := runtime.FuncForPC(stack[0] + i)
    22  		if f.Name() != "main.main" && f.Name() != "main.f" {
    23  			// Reached next function successfully.
    24  			break
    25  		}
    26  	}
    27  }
    28  
    29  func f() {
    30  	sink = 0 // one instruction which can't be removed
    31  }
    32  
    33  var sink int
    34
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