mirror of
https://github.com/golang/go
synced 2024-07-21 01:55:06 +00:00
085529bd5f
For instantiated generic functions, all implicit dot operations are resolved. Thus unsafe.Offsetof may calculating the offset against the wrong base selector. To fix it, we must remove any implicit dot operations to find the first non-implicit one, which is the right base selector for calculating the offset. Fixes #53137 Change-Id: I38504067ce0f274615b306edc8f7d7933bdb631a Reviewed-on: https://go-review.googlesource.com/c/go/+/409355 Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Keith Randall <khr@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
33 lines
466 B
Go
33 lines
466 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 (
|
|
"unsafe"
|
|
)
|
|
|
|
type Embedded struct {
|
|
B int
|
|
}
|
|
|
|
type S[K any] struct {
|
|
A K
|
|
Embedded
|
|
}
|
|
|
|
func showOffsets[K any](d *S[K]) {
|
|
o1 := unsafe.Offsetof(d.B)
|
|
o2 := unsafe.Offsetof(d.Embedded)
|
|
if o1 != o2 {
|
|
panic("offset mismatch")
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
showOffsets(new(S[int]))
|
|
}
|