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cmd/compile: mark ODYNAMICDOTTYPE as an expression that can panic

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Fixes #47924

Change-Id: I4325b3c4ed9d369d9ea778478285436e1b2ab08a
Reviewed-on: https://go-review.googlesource.com/c/go/+/344571
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
This commit is contained in:
Keith Randall 2021-08-24 10:21:16 -07:00
parent 5b64381155
commit c2f96e686f
2 changed files with 16 additions and 1 deletions
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2
src/cmd/compile/internal/walk/walk.go
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@ -312,7 +312,7 @@ func mayCall(n ir.Node) bool {
return true
case ir.OINDEX, ir.OSLICE, ir.OSLICEARR, ir.OSLICE3, ir.OSLICE3ARR, ir.OSLICESTR,
ir.ODEREF, ir.ODOTPTR, ir.ODOTTYPE, ir.ODIV, ir.OMOD, ir.OSLICE2ARRPTR:
ir.ODEREF, ir.ODOTPTR, ir.ODOTTYPE, ir.ODYNAMICDOTTYPE, ir.ODIV, ir.OMOD, ir.OSLICE2ARRPTR:
// These ops might panic, make sure they are done
// before we start marshaling args for a call. See issue 16760.
return true

15
test/typeparam/issue47924.go Normal file
View File

@ -0,0 +1,15 @@
// compile -G=3
// Copyright 2021 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 Cache[K any] struct{}
func (c Cache[K]) foo(x interface{}, f func(K) bool) {
f(x.(K))
}
var _ Cache[int]