mirror of
https://github.com/golang/go
synced 2024-11-17 19:04:47 -07:00
fcf6afb82d
They should not share a shape with regular pointers. We could coalesce multiple pointer-to-not-in-heap types, but doesn't seem worth it - just make them fully stenciled. Fixes #51733 Change-Id: Ie8158177226fbc46a798e71c51897a82f15153df Reviewed-on: https://go-review.googlesource.com/c/go/+/393895 Trust: Keith Randall <khr@golang.org> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
33 lines
585 B
Go
33 lines
585 B
Go
// run
|
|
|
|
// Copyright 2022 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 main
|
|
|
|
import (
|
|
"log"
|
|
"unsafe"
|
|
)
|
|
|
|
//go:notinheap
|
|
type S struct{}
|
|
|
|
func main() {
|
|
p := (*S)(unsafe.Pointer(uintptr(0x8000)))
|
|
var v any = p
|
|
p2 := v.(*S)
|
|
if p != p2 {
|
|
log.Fatalf("%p != %p", unsafe.Pointer(p), unsafe.Pointer(p2))
|
|
}
|
|
p2 = typeAssert[*S](v)
|
|
if p != p2 {
|
|
log.Fatalf("%p != %p from typeAssert", unsafe.Pointer(p), unsafe.Pointer(p2))
|
|
}
|
|
}
|
|
|
|
func typeAssert[T any](v any) T {
|
|
return v.(T)
|
|
}
|