From f15eac1110cc963cabda42759e6eb9d6f077f30a Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Tue, 17 May 2011 22:09:53 +0000
Subject: Do some safety checks.

llvm-svn: 131491
---
 clang/lib/Basic/SourceManager.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

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

diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
index c3e0393..ae7de2d 100644
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -961,6 +961,12 @@ static void ComputeLineNumbers(Diagnostic &Diag, ContentCache *FI,
 /// about to emit a diagnostic.
 unsigned SourceManager::getLineNumber(FileID FID, unsigned FilePos, 
                                       bool *Invalid) const {
+  if (FID.isInvalid()) {
+    if (Invalid)
+      *Invalid = true;
+    return 1;
+  }
+
   ContentCache *Content;
   if (LastLineNoFileIDQuery == FID)
     Content = LastLineNoContentCache;
-- 
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