| // Copyright 2020 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package ld |
| |
| import ( |
| "bytes" |
| "internal/testenv" |
| "path/filepath" |
| "testing" |
| ) |
| |
| func TestDeadcode(t *testing.T) { |
| testenv.MustHaveGoBuild(t) |
| t.Parallel() |
| |
| tmpdir := t.TempDir() |
| |
| tests := []struct { |
| src string |
| pos, neg []string // positive and negative patterns |
| }{ |
| {"reflectcall", nil, []string{"main.T.M"}}, |
| {"typedesc", nil, []string{"type:main.T"}}, |
| {"ifacemethod", nil, []string{"main.T.M"}}, |
| {"ifacemethod2", []string{"main.T.M"}, nil}, |
| {"ifacemethod3", []string{"main.S.M"}, nil}, |
| {"ifacemethod4", nil, []string{"main.T.M"}}, |
| {"ifacemethod5", []string{"main.S.M"}, nil}, |
| {"ifacemethod6", []string{"main.S.M"}, []string{"main.S.N"}}, |
| {"structof_funcof", []string{"main.S.M"}, []string{"main.S.N"}}, |
| {"globalmap", []string{"main.small", "main.effect"}, |
| []string{"main.large"}}, |
| } |
| for _, test := range tests { |
| test := test |
| t.Run(test.src, func(t *testing.T) { |
| t.Parallel() |
| src := filepath.Join("testdata", "deadcode", test.src+".go") |
| exe := filepath.Join(tmpdir, test.src+".exe") |
| cmd := testenv.Command(t, testenv.GoToolPath(t), "build", "-ldflags=-dumpdep", "-o", exe, src) |
| out, err := cmd.CombinedOutput() |
| if err != nil { |
| t.Fatalf("%v: %v:\n%s", cmd.Args, err, out) |
| } |
| for _, pos := range test.pos { |
| if !bytes.Contains(out, []byte(pos+"\n")) { |
| t.Errorf("%s should be reachable. Output:\n%s", pos, out) |
| } |
| } |
| for _, neg := range test.neg { |
| if bytes.Contains(out, []byte(neg+"\n")) { |
| t.Errorf("%s should not be reachable. Output:\n%s", neg, out) |
| } |
| } |
| }) |
| } |
| } |