File size: 3,507 Bytes
fc11197 | 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | // Copyright 2016 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 test
import (
"bytes"
"internal/platform"
"internal/testenv"
"os"
"path/filepath"
"runtime"
"strings"
"testing"
)
type T struct {
x [2]int64 // field that will be clobbered. Also makes type not SSAable.
p *byte // has a pointer
}
//go:noinline
func makeT() T {
return T{}
}
var g T
var sink any
func TestIssue15854(t *testing.T) {
for i := 0; i < 10000; i++ {
if g.x[0] != 0 {
t.Fatalf("g.x[0] clobbered with %x\n", g.x[0])
}
// The bug was in the following assignment. The return
// value of makeT() is not copied out of the args area of
// stack frame in a timely fashion. So when write barriers
// are enabled, the marshaling of the args for the write
// barrier call clobbers the result of makeT() before it is
// read by the write barrier code.
g = makeT()
sink = make([]byte, 1000) // force write barriers to eventually happen
}
}
func TestIssue15854b(t *testing.T) {
const N = 10000
a := make([]T, N)
for i := 0; i < N; i++ {
a = append(a, makeT())
sink = make([]byte, 1000) // force write barriers to eventually happen
}
for i, v := range a {
if v.x[0] != 0 {
t.Fatalf("a[%d].x[0] clobbered with %x\n", i, v.x[0])
}
}
}
// Test that the generated assembly has line numbers (Issue #16214).
func TestIssue16214(t *testing.T) {
testenv.MustHaveGoBuild(t)
dir := t.TempDir()
src := filepath.Join(dir, "x.go")
err := os.WriteFile(src, []byte(issue16214src), 0644)
if err != nil {
t.Fatalf("could not write file: %v", err)
}
cmd := testenv.Command(t, testenv.GoToolPath(t), "tool", "compile", "-p=main", "-S", "-o", filepath.Join(dir, "out.o"), src)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("go tool compile: %v\n%s", err, out)
}
if strings.Contains(string(out), "unknown line number") {
t.Errorf("line number missing in assembly:\n%s", out)
}
}
var issue16214src = `
package main
func Mod32(x uint32) uint32 {
return x % 3 // frontend rewrites it as HMUL with 2863311531, the LITERAL node has unknown Pos
}
`
// Test that building and running a program with -race -gcflags='all=-N -l'
// does not crash. This is a regression test for #77597 where generic functions
// from NoRaceFunc packages (like internal/runtime/atomic) were incorrectly
// getting racefuncenter/racefuncexit instrumentation when instantiated in
// other packages with optimizations disabled.
func TestIssue77597(t *testing.T) {
if !platform.RaceDetectorSupported(runtime.GOOS, runtime.GOARCH) {
t.Skipf("race detector not supported on %s/%s", runtime.GOOS, runtime.GOARCH)
}
testenv.MustHaveGoBuild(t)
testenv.MustHaveGoRun(t)
testenv.MustHaveCGO(t)
dir := t.TempDir()
src := filepath.Join(dir, "main.go")
err := os.WriteFile(src, []byte(issue77597src), 0644)
if err != nil {
t.Fatalf("could not write file: %v", err)
}
cmd := testenv.Command(t, testenv.GoToolPath(t), "run", "-race", "-gcflags=all=-N -l", src)
out, err := cmd.CombinedOutput()
if err != nil {
// For details, please refer to CL 160919.
unsupportedVMA := []byte("unsupported VMA range")
if bytes.Contains(out, unsupportedVMA) {
t.Skipf("skipped due to unsupported VMA on %s/%s", runtime.GOOS, runtime.GOARCH)
} else {
t.Fatalf("program failed: %v\n%s", err, out)
}
}
}
var issue77597src = `
package main
import "fmt"
func main() {
fmt.Println("OK")
}
`
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