File size: 2,936 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | // 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 goobj
import (
"bufio"
"bytes"
"fmt"
"internal/buildcfg"
"internal/testenv"
"os"
"testing"
"cmd/internal/bio"
"cmd/internal/objabi"
)
func dummyWriter(buf *bytes.Buffer) *Writer {
wr := &bio.Writer{Writer: bufio.NewWriter(buf)} // hacky: no file, so cannot seek
return NewWriter(wr)
}
func TestReadWrite(t *testing.T) {
// Test that we get the same data in a write-read roundtrip.
// Write a symbol, a relocation, and an aux info.
var buf bytes.Buffer
w := dummyWriter(&buf)
var s Sym
s.SetABI(1)
s.SetType(uint8(objabi.STEXT))
s.SetFlag(0x12)
s.SetSiz(12345)
s.SetAlign(8)
s.Write(w)
var r Reloc
r.SetOff(12)
r.SetSiz(4)
r.SetType(uint16(objabi.R_ADDR))
r.SetAdd(54321)
r.SetSym(SymRef{11, 22})
r.Write(w)
var a Aux
a.SetType(AuxFuncInfo)
a.SetSym(SymRef{33, 44})
a.Write(w)
w.wr.Flush()
// Read them back and check.
b := buf.Bytes()
var s2 Sym
s2.fromBytes(b)
if s2.ABI() != 1 || s2.Type() != uint8(objabi.STEXT) || s2.Flag() != 0x12 || s2.Siz() != 12345 || s2.Align() != 8 {
t.Errorf("read Sym2 mismatch: got %v %v %v %v %v", s2.ABI(), s2.Type(), s2.Flag(), s2.Siz(), s2.Align())
}
b = b[SymSize:]
var r2 Reloc
r2.fromBytes(b)
if r2.Off() != 12 || r2.Siz() != 4 || r2.Type() != uint16(objabi.R_ADDR) || r2.Add() != 54321 || r2.Sym() != (SymRef{11, 22}) {
t.Errorf("read Reloc2 mismatch: got %v %v %v %v %v", r2.Off(), r2.Siz(), r2.Type(), r2.Add(), r2.Sym())
}
b = b[RelocSize:]
var a2 Aux
a2.fromBytes(b)
if a2.Type() != AuxFuncInfo || a2.Sym() != (SymRef{33, 44}) {
t.Errorf("read Aux2 mismatch: got %v %v", a2.Type(), a2.Sym())
}
}
var issue41621prolog = `
package main
var lines = []string{
`
var issue41621epilog = `
}
func getLines() []string {
return lines
}
func main() {
println(getLines())
}
`
func TestIssue41621LargeNumberOfRelocations(t *testing.T) {
if testing.Short() || (buildcfg.GOARCH != "amd64") {
t.Skipf("Skipping large number of relocations test in short mode or on %s", buildcfg.GOARCH)
}
testenv.MustHaveGoBuild(t)
tmpdir := t.TempDir()
// Emit testcase.
var w bytes.Buffer
w.WriteString(issue41621prolog)
for i := 0; i < 1048576+13; i++ {
fmt.Fprintf(&w, "\t\"%d\",\n", i)
}
w.WriteString(issue41621epilog)
err := os.WriteFile(tmpdir+"/large.go", w.Bytes(), 0666)
if err != nil {
t.Fatalf("can't write output: %v\n", err)
}
// Emit go.mod
w.Reset()
fmt.Fprintf(&w, "module issue41621\n\ngo 1.12\n")
err = os.WriteFile(tmpdir+"/go.mod", w.Bytes(), 0666)
if err != nil {
t.Fatalf("can't write output: %v\n", err)
}
w.Reset()
// Build.
cmd := testenv.Command(t, testenv.GoToolPath(t), "build", "-o", "large")
cmd.Dir = tmpdir
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("Build failed: %v, output: %s", err, out)
}
}
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