mirror of
https://github.com/golang/go
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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
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// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"log"
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"unsafe"
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)
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//go:notinheap
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type S struct{}
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func main() {
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p := (*S)(unsafe.Pointer(uintptr(0x8000)))
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var v any = p
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p2 := v.(*S)
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if p != p2 {
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log.Fatalf("%p != %p", unsafe.Pointer(p), unsafe.Pointer(p2))
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}
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p2 = typeAssert[*S](v)
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if p != p2 {
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log.Fatalf("%p != %p from typeAssert", unsafe.Pointer(p), unsafe.Pointer(p2))
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}
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}
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func typeAssert[T any](v any) T {
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return v.(T)
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}
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