deadcode_test.go

     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  
     5  package ld
     6  
     7  import (
     8  	"bytes"
     9  	"internal/testenv"
    10  	"path/filepath"
    11  	"testing"
    12  )
    13  
    14  func 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  		t.Run(test.src, func(t *testing.T) {
    38  			t.Parallel()
    39  			src := filepath.Join("testdata", "deadcode", test.src+".go")
    40  			exe := filepath.Join(tmpdir, test.src+".exe")
    41  			cmd := testenv.Command(t, testenv.GoToolPath(t), "build", "-ldflags=-dumpdep", "-o", exe, src)
    42  			out, err := cmd.CombinedOutput()
    43  			if err != nil {
    44  				t.Fatalf("%v: %v:\n%s", cmd.Args, err, out)
    45  			}
    46  			for _, pos := range test.pos {
    47  				if !bytes.Contains(out, []byte(pos+"\n")) {
    48  					t.Errorf("%s should be reachable. Output:\n%s", pos, out)
    49  				}
    50  			}
    51  			for _, neg := range test.neg {
    52  				if bytes.Contains(out, []byte(neg+"\n")) {
    53  					t.Errorf("%s should not be reachable. Output:\n%s", neg, out)
    54  				}
    55  			}
    56  		})
    57  	}
    58  }
    59
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