blob: ce852009ea7336cfc47e17fb35920b0c0381d5e8 [file] [log] [blame]
// Copyright 2014 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 testdata
import (
"reflect"
"unsafe"
)
func f() {
var x unsafe.Pointer
var y uintptr
x = unsafe.Pointer(y) // ERROR "possible misuse of unsafe.Pointer"
y = uintptr(x)
// only allowed pointer arithmetic is ptr +/-/&^ num.
// num+ptr is technically okay but still flagged: write ptr+num instead.
x = unsafe.Pointer(uintptr(x) + 1)
x = unsafe.Pointer(1 + uintptr(x)) // ERROR "possible misuse of unsafe.Pointer"
x = unsafe.Pointer(uintptr(x) + uintptr(x)) // ERROR "possible misuse of unsafe.Pointer"
x = unsafe.Pointer(uintptr(x) - 1)
x = unsafe.Pointer(1 - uintptr(x)) // ERROR "possible misuse of unsafe.Pointer"
x = unsafe.Pointer(uintptr(x) &^ 3)
x = unsafe.Pointer(1 &^ uintptr(x)) // ERROR "possible misuse of unsafe.Pointer"
// certain uses of reflect are okay
var v reflect.Value
x = unsafe.Pointer(v.Pointer())
x = unsafe.Pointer(v.UnsafeAddr())
var s1 *reflect.StringHeader
x = unsafe.Pointer(s1.Data)
var s2 *reflect.SliceHeader
x = unsafe.Pointer(s2.Data)
var s3 reflect.StringHeader
x = unsafe.Pointer(s3.Data) // ERROR "possible misuse of unsafe.Pointer"
var s4 reflect.SliceHeader
x = unsafe.Pointer(s4.Data) // ERROR "possible misuse of unsafe.Pointer"
// but only in reflect
var vv V
x = unsafe.Pointer(vv.Pointer()) // ERROR "possible misuse of unsafe.Pointer"
x = unsafe.Pointer(vv.UnsafeAddr()) // ERROR "possible misuse of unsafe.Pointer"
var ss1 *StringHeader
x = unsafe.Pointer(ss1.Data) // ERROR "possible misuse of unsafe.Pointer"
var ss2 *SliceHeader
x = unsafe.Pointer(ss2.Data) // ERROR "possible misuse of unsafe.Pointer"
}
type V interface {
Pointer() uintptr
UnsafeAddr() uintptr
}
type StringHeader struct {
Data uintptr
}
type SliceHeader struct {
Data uintptr
}