8dc2499aa6
gotools/ * Makefile.am (go_cmd_cgo_files): Add ast_go118.go (check-go-tool): Copy golang.org/x/tools directories. * Makefile.in: Regenerate. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/384695
56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
// 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.
|
|
|
|
//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd
|
|
|
|
// TODO: test on Windows?
|
|
|
|
package debug_test
|
|
|
|
import (
|
|
"runtime"
|
|
"runtime/debug"
|
|
"syscall"
|
|
"testing"
|
|
"unsafe"
|
|
)
|
|
|
|
func TestPanicOnFault(t *testing.T) {
|
|
if runtime.GOARCH == "s390x" {
|
|
t.Skip("s390x fault addresses are missing the low order bits")
|
|
}
|
|
if runtime.GOOS == "ios" {
|
|
t.Skip("iOS doesn't provide fault addresses")
|
|
}
|
|
if runtime.GOOS == "netbsd" && runtime.GOARCH == "arm" {
|
|
t.Skip("netbsd-arm doesn't provide fault address (golang.org/issue/45026)")
|
|
}
|
|
m, err := syscall.Mmap(-1, 0, 0x1000, syscall.PROT_READ /* Note: no PROT_WRITE */, syscall.MAP_SHARED|syscall.MAP_ANON)
|
|
if err != nil {
|
|
t.Fatalf("can't map anonymous memory: %s", err)
|
|
}
|
|
defer syscall.Munmap(m)
|
|
old := debug.SetPanicOnFault(true)
|
|
defer debug.SetPanicOnFault(old)
|
|
const lowBits = 0x3e7
|
|
defer func() {
|
|
r := recover()
|
|
if r == nil {
|
|
t.Fatalf("write did not fault")
|
|
}
|
|
type addressable interface {
|
|
Addr() uintptr
|
|
}
|
|
a, ok := r.(addressable)
|
|
if !ok {
|
|
t.Fatalf("fault does not contain address")
|
|
}
|
|
want := uintptr(unsafe.Pointer(&m[lowBits]))
|
|
got := a.Addr()
|
|
if got != want {
|
|
t.Fatalf("fault address %x, want %x", got, want)
|
|
}
|
|
}()
|
|
m[lowBits] = 1 // will fault
|
|
}
|