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cmd/compile: checkwidth T when constructing *T

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Without this, T can sneak through to the backend
with its width unknown.

Fixes #20174

Change-Id: I9b21e0e2641f75e360cc5e45dcb4eefe8255b675
Reviewed-on: https://go-review.googlesource.com/42175
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-04-29 14:27:55 -07:00
parent 320aabbada
commit dfeecda91d
2 changed files with 19 additions and 0 deletions
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1
src/cmd/compile/internal/gc/typecheck.go
View file

@ -498,6 +498,7 @@ OpSwitch:
ok |= Etype
n.Op = OTYPE
n.Type = types.NewPtr(l.Type)
checkwidth(l.Type) // ensure this gets dowidth'd for the backend
n.Left = nil
break OpSwitch
}

18
test/fixedbugs/issue20174.go Normal file
View file

@ -0,0 +1,18 @@
// compile -c=2
// Copyright 2017 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.
// Issue 20174: failure to typecheck contents of *T in the frontend.
package p
func f() {
_ = (*interface{})(nil) // interface{} here used to not have its width calculated going into backend
select {
case _ = <-make(chan interface {
M()
}, 1):
}
}