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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"
"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"}},
{"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)
}
}
})
}
}