main.go

     1  // Copyright 2021 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  package main
     6  
     7  import (
     8  	"sort"
     9  	"strings"
    10  
    11  	"issue20014.dir/a"
    12  )
    13  
    14  func main() {
    15  	samePackage()
    16  	crossPackage()
    17  
    18  	// Print fields registered with field tracking.
    19  	var fields []string
    20  	for _, line := range strings.Split(fieldTrackInfo, "\n") {
    21  		if line != "" {
    22  			fields = append(fields, strings.Split(line, "\t")[0])
    23  		}
    24  	}
    25  	sort.Strings(fields) // for stable output, regardless of optimizations
    26  	for _, field := range fields {
    27  		println(field)
    28  	}
    29  }
    30  
    31  type T struct {
    32  	X int `go:"track"`
    33  	Y int `go:"track"`
    34  	Z int // untracked
    35  }
    36  
    37  func (t *T) GetX() int {
    38  	return t.X
    39  }
    40  func (t *T) GetY() int {
    41  	return t.Y
    42  }
    43  func (t *T) GetZ() int {
    44  	return t.Z
    45  }
    46  
    47  func samePackage() {
    48  	var t T
    49  	println(t.GetX())
    50  	println(t.GetZ())
    51  }
    52  
    53  func crossPackage() {
    54  	var t a.T
    55  	println(t.GetX())
    56  	println(t.GetZ())
    57  }
    58  
    59  // This global variable is set by the linker using the -k option.
    60  var fieldTrackInfo string
    61
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