From 6abd38bf6efc809654fcdf6c98d4378fcc4a040b Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@chromium.org>
Date: Sat, 28 May 2016 08:20:08 +0000
Subject: [MC] Return early when .fill size is negative

Rather than invoking emitFill with negative size, which may trigger
an undefined behavior, return immediately after emitting the warning.

Differential Revision: http://reviews.llvm.org/D20768

llvm-svn: 271107
---
 llvm/lib/MC/MCParser/AsmParser.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'llvm/lib/MC/MCParser/AsmParser.cpp')

diff --git a/llvm/lib/MC/MCParser/AsmParser.cpp b/llvm/lib/MC/MCParser/AsmParser.cpp
index dcc02a9ab8c..5262558df1a 100644
--- a/llvm/lib/MC/MCParser/AsmParser.cpp
+++ b/llvm/lib/MC/MCParser/AsmParser.cpp
@@ -2801,7 +2801,7 @@ bool AsmParser::parseDirectiveFill() {
 
   if (FillSize < 0) {
     Warning(SizeLoc, "'.fill' directive with negative size has no effect");
-    NumValues = MCConstantExpr::create(0, getStreamer().getContext());
+    return false;
   }
   if (FillSize > 8) {
     Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8");
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