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// 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"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"testing"
)
func TestDeadcode(t *testing.T) {
testenv.MustHaveGoBuild(t)
t.Parallel()
tmpdir, err := ioutil.TempDir("", "TestDeadcode")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpdir)
tests := []struct {
src string
pos, neg string // positive and negative patterns
}{
{"reflectcall", "", "main.T.M"},
{"typedesc", "", "type.main.T"},
{"ifacemethod", "", "main.T.M"},
{"ifacemethod2", "main.T.M", ""},
}
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 := exec.Command(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)
}
if test.pos != "" && !bytes.Contains(out, []byte(test.pos)) {
t.Errorf("%s should be reachable. Output:\n%s", test.pos, out)
}
if test.neg != "" && bytes.Contains(out, []byte(test.neg)) {
t.Errorf("%s should not be reachable. Output:\n%s", test.neg, out)
}
})
}
}
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