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.
20 func dummyWriter(buf *bytes.Buffer) *Writer {
21 wr := &bio.Writer{Writer: bufio.NewWriter(buf)} // hacky: no file, so cannot seek
25 func TestReadWrite(t *testing.T) {
26 // Test that we get the same data in a write-read roundtrip.
28 // Write a symbol, a relocation, and an aux info.
30 w := dummyWriter(&buf)
34 s.SetType(uint8(objabi.STEXT))
43 r.SetType(uint16(objabi.R_ADDR))
45 r.SetSym(SymRef{11, 22})
49 a.SetType(AuxFuncInfo)
50 a.SetSym(SymRef{33, 44})
55 // Read them back and check.
59 if s2.ABI() != 1 || s2.Type() != uint8(objabi.STEXT) || s2.Flag() != 0x12 || s2.Siz() != 12345 || s2.Align() != 8 {
60 t.Errorf("read Sym2 mismatch: got %v %v %v %v %v", s2.ABI(), s2.Type(), s2.Flag(), s2.Siz(), s2.Align())
66 if r2.Off() != 12 || r2.Siz() != 4 || r2.Type() != uint16(objabi.R_ADDR) || r2.Add() != 54321 || r2.Sym() != (SymRef{11, 22}) {
67 t.Errorf("read Reloc2 mismatch: got %v %v %v %v %v", r2.Off(), r2.Siz(), r2.Type(), r2.Add(), r2.Sym())
73 if a2.Type() != AuxFuncInfo || a2.Sym() != (SymRef{33, 44}) {
74 t.Errorf("read Aux2 mismatch: got %v %v", a2.Type(), a2.Sym())
78 var issue41621prolog = `
83 var issue41621epilog = `
85 func getLines() []string {
93 func TestIssue41621LargeNumberOfRelocations(t *testing.T) {
94 if testing.Short() || (objabi.GOARCH != "amd64") {
95 t.Skipf("Skipping large number of relocations test in short mode or on %s", objabi.GOARCH)
97 testenv.MustHaveGoBuild(t)
99 tmpdir, err := ioutil.TempDir("", "lotsofrelocs")
101 t.Fatalf("can't create temp directory: %v\n", err)
103 defer os.RemoveAll(tmpdir)
107 fmt.Fprintf(&w, issue41621prolog)
108 for i := 0; i < 1048576+13; i++ {
109 fmt.Fprintf(&w, "\t\"%d\",\n", i)
111 fmt.Fprintf(&w, issue41621epilog)
112 err = ioutil.WriteFile(tmpdir+"/large.go", w.Bytes(), 0666)
114 t.Fatalf("can't write output: %v\n", err)
119 fmt.Fprintf(&w, "module issue41621\n\ngo 1.12\n")
120 err = ioutil.WriteFile(tmpdir+"/go.mod", w.Bytes(), 0666)
122 t.Fatalf("can't write output: %v\n", err)
127 cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "large")
129 out, err := cmd.CombinedOutput()
131 t.Fatalf("Build failed: %v, output: %s", err, out)