From 9808da6fa62255d1ad77d988ef3617a2381e3299 Mon Sep 17 00:00:00 2001
From: Neil Hodgson <nyamatongwe@gmail.com>
Date: Tue, 18 Sep 2018 13:00:08 +1000
Subject: Backport: Guard against shifting by negative amount as that is
 undefined behaviour.

Backport of changeset 7090:041e498f21d3.
---
 lexers/LexVerilog.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'lexers/LexVerilog.cxx')

diff --git a/lexers/LexVerilog.cxx b/lexers/LexVerilog.cxx
index c4e40e1ec..3dc2ac1ef 100644
--- a/lexers/LexVerilog.cxx
+++ b/lexers/LexVerilog.cxx
@@ -57,7 +57,11 @@ class LinePPState {
 		return level >= 0 && level < 32;
 	}
 	int maskLevel() const {
-		return 1 << level;
+		if (level >= 0) {
+			return 1 << level;
+		} else {
+			return 1;
+		}
 	}
 public:
 	LinePPState() : state(0), ifTaken(0), level(-1) {
-- 
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