1// Copyright 2020 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 5package ld 6 7import ( 8 "bytes" 9 "internal/testenv" 10 "path/filepath" 11 "testing" 12) 13 14func TestDeadcode(t *testing.T) { 15 testenv.MustHaveGoBuild(t) 16 t.Parallel() 17 18 tmpdir := t.TempDir() 19 20 tests := []struct { 21 src string 22 pos, neg []string // positive and negative patterns 23 }{ 24 {"reflectcall", nil, []string{"main.T.M"}}, 25 {"typedesc", nil, []string{"type:main.T"}}, 26 {"ifacemethod", nil, []string{"main.T.M"}}, 27 {"ifacemethod2", []string{"main.T.M"}, nil}, 28 {"ifacemethod3", []string{"main.S.M"}, nil}, 29 {"ifacemethod4", nil, []string{"main.T.M"}}, 30 {"ifacemethod5", []string{"main.S.M"}, nil}, 31 {"ifacemethod6", []string{"main.S.M"}, []string{"main.S.N"}}, 32 {"structof_funcof", []string{"main.S.M"}, []string{"main.S.N"}}, 33 {"globalmap", []string{"main.small", "main.effect"}, 34 []string{"main.large"}}, 35 } 36 for _, test := range tests { 37 test := test 38 t.Run(test.src, func(t *testing.T) { 39 t.Parallel() 40 src := filepath.Join("testdata", "deadcode", test.src+".go") 41 exe := filepath.Join(tmpdir, test.src+".exe") 42 cmd := testenv.Command(t, testenv.GoToolPath(t), "build", "-ldflags=-dumpdep", "-o", exe, src) 43 out, err := cmd.CombinedOutput() 44 if err != nil { 45 t.Fatalf("%v: %v:\n%s", cmd.Args, err, out) 46 } 47 for _, pos := range test.pos { 48 if !bytes.Contains(out, []byte(pos+"\n")) { 49 t.Errorf("%s should be reachable. Output:\n%s", pos, out) 50 } 51 } 52 for _, neg := range test.neg { 53 if bytes.Contains(out, []byte(neg+"\n")) { 54 t.Errorf("%s should not be reachable. Output:\n%s", neg, out) 55 } 56 } 57 }) 58 } 59} 60