From cf3f2c49eaca66d0d2568ce7711b370fcf0f8bb0 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Tue, 13 Nov 2012 19:12:37 +0000
Subject: Revert r167801, "[preprocessor] When #including something that
 contributes no tokens at all,". This change broke External/Nurbs in LLVM
 test-suite.

llvm-svn: 167858
---
 clang/lib/Lex/Lexer.cpp             | 22 ----------------------
 clang/lib/Lex/PreprocessorLexer.cpp |  2 +-
 2 files changed, 1 insertion(+), 23 deletions(-)

(limited to 'clang/lib/Lex')

diff --git a/clang/lib/Lex/Lexer.cpp b/clang/lib/Lex/Lexer.cpp
index 6917645ca4f..bf0883e12a2 100644
--- a/clang/lib/Lex/Lexer.cpp
+++ b/clang/lib/Lex/Lexer.cpp
@@ -2594,14 +2594,8 @@ LexNextToken:
       // Read the PP instance variable into an automatic variable, because
       // LexEndOfFile will often delete 'this'.
       Preprocessor *PPCache = PP;
-      bool EnableIncludedEOFCache = EnableIncludedEOF;
       if (LexEndOfFile(Result, CurPtr-1))  // Retreat back into the file.
         return;   // Got a token to return.
-
-      if (EnableIncludedEOFCache) {
-        Result.setKind(tok::included_eof);
-        return;
-      }
       assert(PPCache && "Raw buffer::LexEndOfFile should return a token");
       return PPCache->Lex(Result);
     }
@@ -3239,21 +3233,5 @@ HandleDirective:
     }
     goto LexNextToken;   // GCC isn't tail call eliminating.
   }
-
-  if (PreprocessorLexer *PPLex = PP->getCurrentLexer()) {
-    // If we #include something that contributes no tokens at all, return with
-    // a tok::included_eof instead of recursively continuing lexing.
-    // This avoids a stack overflow with a sequence of many empty #includes.
-    PPLex->setEnableIncludedEOF(true);
-    PP->Lex(Result);
-    if (Result.isNot(tok::included_eof)) {
-      if (Result.isNot(tok::eof) && Result.isNot(tok::eod))
-        PPLex->setEnableIncludedEOF(false);
-      return;
-    }
-    if (PP->isCurrentLexer(this))
-      goto LexNextToken;
-  }
-
   return PP->Lex(Result);
 }
diff --git a/clang/lib/Lex/PreprocessorLexer.cpp b/clang/lib/Lex/PreprocessorLexer.cpp
index 390d4c4523b..a64c84d6bbd 100644
--- a/clang/lib/Lex/PreprocessorLexer.cpp
+++ b/clang/lib/Lex/PreprocessorLexer.cpp
@@ -22,7 +22,7 @@ void PreprocessorLexer::anchor() { }
 PreprocessorLexer::PreprocessorLexer(Preprocessor *pp, FileID fid)
   : PP(pp), FID(fid), InitialNumSLocEntries(0),
     ParsingPreprocessorDirective(false),
-    ParsingFilename(false), LexingRawMode(false), EnableIncludedEOF(false) {
+    ParsingFilename(false), LexingRawMode(false) {
   if (pp)
     InitialNumSLocEntries = pp->getSourceManager().local_sloc_entry_size();
 }
-- 
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