a.go

     1  // Copyright 2019 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Make sure tracebacks from initialization code are reported correctly.
     6  
     7  package a
     8  
     9  import (
    10  	"fmt"
    11  	"runtime"
    12  	"strings"
    13  )
    14  
    15  var x = f() // line 15
    16  
    17  func f() int {
    18  	var b [4096]byte
    19  	n := runtime.Stack(b[:], false) // line 19
    20  	s := string(b[:n])
    21  	var pcs [10]uintptr
    22  	n = runtime.Callers(1, pcs[:]) // line 22
    23  
    24  	// Check the Stack results.
    25  	if debug {
    26  		println(s)
    27  	}
    28  	if strings.Contains(s, "autogenerated") {
    29  		panic("autogenerated code in traceback")
    30  	}
    31  	if !strings.Contains(s, "a.go:15") {
    32  		panic("missing a.go:15")
    33  	}
    34  	if !strings.Contains(s, "a.go:19") {
    35  		panic("missing a.go:19")
    36  	}
    37  	if !strings.Contains(s, "a.init") {
    38  		panic("missing a.init")
    39  	}
    40  
    41  	// Check the CallersFrames results.
    42  	if debug {
    43  		iter := runtime.CallersFrames(pcs[:n])
    44  		for {
    45  			f, more := iter.Next()
    46  			fmt.Printf("%s %s:%d\n", f.Function, f.File, f.Line)
    47  			if !more {
    48  				break
    49  			}
    50  		}
    51  	}
    52  	iter := runtime.CallersFrames(pcs[:n])
    53  	f, more := iter.Next()
    54  	if f.Function != "test/a.f" || !strings.HasSuffix(f.File, "a.go") || f.Line != 22 {
    55  		panic(fmt.Sprintf("bad f %v\n", f))
    56  	}
    57  	if !more {
    58  		panic("traceback truncated after f")
    59  	}
    60  	f, more = iter.Next()
    61  	if f.Function != "test/a.init" || !strings.HasSuffix(f.File, "a.go") || f.Line != 15 {
    62  		panic(fmt.Sprintf("bad init %v\n", f))
    63  	}
    64  	if !more {
    65  		panic("traceback truncated after init")
    66  	}
    67  	f, _ = iter.Next()
    68  	if !strings.HasPrefix(f.Function, "runtime.") {
    69  		panic("runtime. driver missing")
    70  	}
    71  
    72  	return 0
    73  }
    74  
    75  const debug = false
    76
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