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cmd/compile: don't crash on (unsafe.Sizeof)(0)

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Fixes #17270.

Change-Id: I4affa57e10baf1a758bc0977265d160f220b2945
Reviewed-on: https://go-review.googlesource.com/29960
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Matthew Dempsky 2016-09-28 15:04:00 -07:00
parent 4d07d3e29c
commit 03a1dc3522
2 changed files with 28 additions and 19 deletions
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12
src/cmd/compile/internal/gc/typecheck.go
View File

@ -1185,11 +1185,12 @@ OpSwitch:
// call and call like // call and call like
case OCALL: case OCALL:
n.Left = typecheck(n.Left, Erv|Etype|Ecall)
n.Diag |= n.Left.Diag
l := n.Left l := n.Left
if l.Op == ONAME { if l.Op == ONAME {
r := unsafenmagic(n) if r := unsafenmagic(n); r != nil {
if r != nil {
if n.Isddd { if n.Isddd {
yyerror("invalid use of ... with builtin %v", l) yyerror("invalid use of ... with builtin %v", l)
} }
@ -1197,12 +1198,8 @@ OpSwitch:
n = typecheck1(n, top) n = typecheck1(n, top)
return n return n
} }
}
n.Left = typecheck(n.Left, Erv|Etype|Ecall) if l.Etype != 0 {
n.Diag |= n.Left.Diag
l = n.Left
if l.Op == ONAME && l.Etype != 0 {
// TODO(marvin): Fix Node.EType type union. // TODO(marvin): Fix Node.EType type union.
if n.Isddd && Op(l.Etype) != OAPPEND { if n.Isddd && Op(l.Etype) != OAPPEND {
yyerror("invalid use of ... with builtin %v", l) yyerror("invalid use of ... with builtin %v", l)
@ -1217,6 +1214,7 @@ OpSwitch:
n = typecheck1(n, top) n = typecheck1(n, top)
return n return n
} }
}
n.Left = defaultlit(n.Left, nil) n.Left = defaultlit(n.Left, nil)
l = n.Left l = n.Left

11
test/fixedbugs/issue17270.go Normal file
View File

@ -0,0 +1,11 @@
// compile
// Copyright 2016 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
import "unsafe"
const _ = (unsafe.Sizeof)(0)