From d391046930e437d4bb42cfa7c7d70f3302f93c7d Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Tue, 7 May 2013 04:29:22 +0000
Subject: [PATCH] Have SourceManager::getLocForEndOfFile() point at the "EOF"
 location of the FileID.

This fixes a crash due to SourceManager::getLocForEndOfFile() returning an off-by-one location
when the the FileID is for an empty file.

rdar://13803893

llvm-svn: 181285
---
 clang/include/clang/Basic/SourceManager.h        | 2 +-
 clang/lib/Rewrite/Frontend/InclusionRewriter.cpp | 2 +-
 clang/test/Index/Inputs/empty.h                  | 0
 clang/test/Index/file-includes.c                 | 3 +++
 4 files changed, 5 insertions(+), 2 deletions(-)
 create mode 100644 clang/test/Index/Inputs/empty.h

diff --git a/clang/include/clang/Basic/SourceManager.h b/clang/include/clang/Basic/SourceManager.h
index f82b196929a3..eccbf1ede7f1 100644
--- a/clang/include/clang/Basic/SourceManager.h
+++ b/clang/include/clang/Basic/SourceManager.h
@@ -1005,7 +1005,7 @@ public:
       return SourceLocation();
     
     unsigned FileOffset = Entry.getOffset();
-    return SourceLocation::getFileLoc(FileOffset + getFileIDSize(FID) - 1);
+    return SourceLocation::getFileLoc(FileOffset + getFileIDSize(FID));
   }
 
   /// \brief Returns the include location if \p FID is a \#include'd file
diff --git a/clang/lib/Rewrite/Frontend/InclusionRewriter.cpp b/clang/lib/Rewrite/Frontend/InclusionRewriter.cpp
index 878be84224ae..9e4bb3c89bcf 100644
--- a/clang/lib/Rewrite/Frontend/InclusionRewriter.cpp
+++ b/clang/lib/Rewrite/Frontend/InclusionRewriter.cpp
@@ -464,7 +464,7 @@ bool InclusionRewriter::Process(FileID FileId,
     RawLex.LexFromRawLexer(RawToken);
   }
   OutputContentUpTo(FromFile, NextToWrite,
-    SM.getFileOffset(SM.getLocForEndOfFile(FileId)) + 1, EOL, Line,
+    SM.getFileOffset(SM.getLocForEndOfFile(FileId)), EOL, Line,
     /*EnsureNewline*/true);
   return true;
 }
diff --git a/clang/test/Index/Inputs/empty.h b/clang/test/Index/Inputs/empty.h
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Index/file-includes.c b/clang/test/Index/file-includes.c
index 2dfced0c0c4f..ac3d568dc53d 100644
--- a/clang/test/Index/file-includes.c
+++ b/clang/test/Index/file-includes.c
@@ -22,3 +22,6 @@ int LocalVar;
 
 // TOP: inclusion directive=targeted-nested1.h ({{.*[/\\]}}test{{[/\\]}}Index{{[/\\]}}targeted-nested1.h) =[5:1 - 5:2]
 // TOP: inclusion directive=targeted-fields.h ({{.*[/\\]}}test{{[/\\]}}Index{{[/\\]}}targeted-fields.h) =[16:1 - 16:2]
+
+// rdar://13803893
+// RUN: c-index-test -file-includes-in=%S/Inputs/empty.h %S/Inputs/empty.h