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cmd/compile: don't crash on invalid labeled statement

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Fixes #14006.

Change-Id: Ia819073677ad6993c02255e23760ee21598427b4
Reviewed-on: https://go-review.googlesource.com/18736
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Robert Griesemer 2016-01-19 13:14:03 -08:00
parent 92ba69d216
commit 7ce2402bae
2 changed files with 70 additions and 1 deletions
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7
src/cmd/compile/internal/gc/parser.go
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@ -668,9 +668,14 @@ func (p *parser) simple_stmt(labelOk, rangeOk bool) *Node {
if labelOk {
// If we have a labelname, it was parsed by operand
// (calling p.name()) and given an ONAME, ONONAME, OTYPE, OPACK, or OLITERAL node.
// We only have a labelname if there is a symbol (was issue 14006).
switch lhs.Op {
case ONAME, ONONAME, OTYPE, OPACK, OLITERAL:
lhs = newname(lhs.Sym)
if lhs.Sym != nil {
lhs = newname(lhs.Sym)
break
}
fallthrough
default:
p.syntax_error("expecting semicolon or newline or }")
// we already progressed, no need to advance