From ef1cf830e089df74d25aebe623704909709668d9 Mon Sep 17 00:00:00 2001
From: Aaron Ballman <aaron@aaronballman.com>
Date: Mon, 18 Nov 2013 18:29:00 +0000
Subject: Adding an assert to help catch possible buffer underruns.

llvm-svn: 195024
---
 clang/lib/Basic/SourceManager.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'clang/lib/Basic/SourceManager.cpp')

diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
index 93e9a59..9d79551 100644
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -1757,6 +1757,10 @@ FileID SourceManager::translateFile(const FileEntry *SourceFile) const {
 SourceLocation SourceManager::translateLineCol(FileID FID,
                                                unsigned Line,
                                                unsigned Col) const {
+  // Lines are used as a one-based index into a zero-based array. This assert
+  // checks for possible buffer underruns.
+  assert(Line != 0 && "Passed a zero-based line");
+
   if (FID.isInvalid())
     return SourceLocation();
 
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