mirror of
https://github.com/golang/go
synced 2024-11-23 19:50:06 -07:00
556b3f5bdf
Updates #23109. Change-Id: I55f7860c868acc948a6397ab6a9295e177724a56 Reviewed-on: https://go-review.googlesource.com/c/go/+/170450 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
70 lines
2.2 KiB
Go
70 lines
2.2 KiB
Go
// errorcheck -0 -m -l
|
|
|
|
// Copyright 2019 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.
|
|
|
|
// Test escape analysis for unsafe.Pointer rules.
|
|
|
|
package escape
|
|
|
|
import (
|
|
"reflect"
|
|
"unsafe"
|
|
)
|
|
|
|
// (1) Conversion of a *T1 to Pointer to *T2.
|
|
|
|
func convert(p *float64) *uint64 { // ERROR "leaking param: p to result ~r1 level=0$"
|
|
return (*uint64)(unsafe.Pointer(p))
|
|
}
|
|
|
|
// (3) Conversion of a Pointer to a uintptr and back, with arithmetic.
|
|
|
|
func arithAdd() unsafe.Pointer {
|
|
var x [2]byte // ERROR "moved to heap: x"
|
|
return unsafe.Pointer(uintptr(unsafe.Pointer(&x[0])) + 1)
|
|
}
|
|
|
|
func arithSub() unsafe.Pointer {
|
|
var x [2]byte // ERROR "moved to heap: x"
|
|
return unsafe.Pointer(uintptr(unsafe.Pointer(&x[1])) - 1)
|
|
}
|
|
|
|
func arithMask() unsafe.Pointer {
|
|
var x [2]byte // ERROR "moved to heap: x"
|
|
return unsafe.Pointer(uintptr(unsafe.Pointer(&x[1])) &^ 1)
|
|
}
|
|
|
|
// (5) Conversion of the result of reflect.Value.Pointer or
|
|
// reflect.Value.UnsafeAddr from uintptr to Pointer.
|
|
|
|
// BAD: should be "leaking param: p to result ~r1 level=0$"
|
|
func valuePointer(p *int) unsafe.Pointer { // ERROR "leaking param: p$"
|
|
return unsafe.Pointer(reflect.ValueOf(p).Pointer()) // ERROR "p escapes to heap"
|
|
}
|
|
|
|
// BAD: should be "leaking param: p to result ~r1 level=0$"
|
|
func valueUnsafeAddr(p *int) unsafe.Pointer { // ERROR "leaking param: p$"
|
|
return unsafe.Pointer(reflect.ValueOf(p).Elem().UnsafeAddr()) // ERROR "p escapes to heap"
|
|
}
|
|
|
|
// (6) Conversion of a reflect.SliceHeader or reflect.StringHeader
|
|
// Data field to or from Pointer.
|
|
|
|
func fromSliceData(s []int) unsafe.Pointer { // ERROR "leaking param: s to result ~r1 level=0$"
|
|
return unsafe.Pointer((*reflect.SliceHeader)(unsafe.Pointer(&s)).Data)
|
|
}
|
|
|
|
func fromStringData(s string) unsafe.Pointer { // ERROR "leaking param: s to result ~r1 level=0$"
|
|
return unsafe.Pointer((*reflect.StringHeader)(unsafe.Pointer(&s)).Data)
|
|
}
|
|
|
|
func toSliceData(s *[]int, p unsafe.Pointer) { // ERROR "s does not escape" "leaking param: p$"
|
|
(*reflect.SliceHeader)(unsafe.Pointer(s)).Data = uintptr(p)
|
|
}
|
|
|
|
func toStringData(s *string, p unsafe.Pointer) { // ERROR "s does not escape" "leaking param: p$"
|
|
(*reflect.SliceHeader)(unsafe.Pointer(s)).Data = uintptr(p)
|
|
}
|