mirror of
https://github.com/golang/go
synced 2024-11-23 07:10:05 -07:00
3b2f67a597
It doesn't have to. The type in the aux field is authoritative.
There are cases involving casting from interface{} where pointers
have a placeholder pointer type (because the type is not known when
the IData op is generated).
The check was introduced in CL 13447.
Fixes #39459
Change-Id: Id77a57577806a271aeebd20bea5d92d08ee7aa6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/239817
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
23 lines
583 B
Go
23 lines
583 B
Go
// compile
|
|
|
|
// Copyright 2020 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 p
|
|
|
|
type T struct { // big enough to be an unSSAable type
|
|
a, b, c, d, e, f int
|
|
}
|
|
|
|
func f(x interface{}, p *int) {
|
|
_ = *p // trigger nil check here, removing it from below
|
|
switch x := x.(type) {
|
|
case *T:
|
|
// Zero twice, so one of them will be removed by the deadstore pass
|
|
*x = T{}
|
|
*p = 0 // store op to prevent Zero ops from being optimized by the earlier opt pass rewrite rules
|
|
*x = T{}
|
|
}
|
|
}
|