Replace the original flex lexer with a hand writen one. This

drops a dependency on flex and lets us make future progress more 
easily.  Yay for 2 fewer .cvs files to make silly conflicts with.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44213 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 57 insertions, 0 deletions

diff --git a/lib/AsmParser/LLLexer.h b/lib/AsmParser/LLLexer.h
new file mode 100644
index 0000000000..eaf32203bb
--- /dev/null
+++ b/lib/AsmParser/LLLexer.h
@@ -0,0 +1,57 @@
+//===- LLLexer.h - Lexer for LLVM Assembly Files ----------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class represents the Lexer for .ll files.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LIB_ASMPARSER_LLLEXER_H
+#define LIB_ASMPARSER_LLLEXER_H
+
+#include <vector>
+#include <string>
+#include <iosfwd>
+
+namespace llvm {
+  class MemoryBuffer;
+  
+  class LLLexer {
+    const char *CurPtr;
+    unsigned CurLineNo;
+    MemoryBuffer *CurBuf;
+    
+    const char *TokStart;
+    
+    std::string TheError;
+  public:
+    LLLexer(MemoryBuffer *StartBuf);
+    ~LLLexer() {}
+
+    const char *getTokStart() const { return TokStart; }
+    unsigned getTokLength() const { return CurPtr-TokStart; }
+    unsigned getLineNo() const { return CurLineNo; }
+    std::string getFilename() const;
+    int LexToken();
+    
+    const std::string getError() const { return TheError; }
+    
+  private:
+    int getNextChar();
+    void SkipLineComment();
+    int LexIdentifier();
+    int LexDigitOrNegative();
+    int LexPositive();
+    int LexAt();
+    int LexPercent();
+    int LexQuote();
+    int Lex0x();
+  };
+} // end namespace llvm
+
+#endif