MC: Add MCAsmParserExtension, a base class for all the target/object specific

classes which want to extend the basic asm parser.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108158 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCParser/MCAsmParserExtension.h

@@ -0,0 +1,65 @@
+//===-- llvm/MC/MCAsmParserExtension.h - Asm Parser Hooks -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCASMPARSEREXTENSION_H
+#define LLVM_MC_MCASMPARSEREXTENSION_H
+
+#include "llvm/MC/MCParser/MCAsmParser.h"
+#include "llvm/Support/SMLoc.h"
+
+namespace llvm {
+
+/// \brief Generic interface for extending the MCAsmParser,
+/// which is implemented by target and object file assembly parser
+/// implementations.
+class MCAsmParserExtension {
+  MCAsmParserExtension(const MCAsmParserExtension &);   // DO NOT IMPLEMENT
+  void operator=(const MCAsmParserExtension &);  // DO NOT IMPLEMENT
+
+  MCAsmParser *Parser;
+
+protected:
+  MCAsmParserExtension();
+
+public:
+  virtual ~MCAsmParserExtension();
+
+  /// \brief Initialize the extension for parsing using the given \arg
+  /// Parser. The extension should use the AsmParser interfaces to register its
+  /// parsing routines.
+  virtual void Initialize(MCAsmParser &Parser);
+
+  /// @name MCAsmParser Proxy Interfaces
+  /// @{
+
+  MCContext &getContext() { return getParser().getContext(); }
+  MCAsmLexer &getLexer() { return getParser().getLexer(); }
+  MCAsmParser &getParser() { return *Parser; }
+  MCStreamer &getStreamer() { return getParser().getStreamer(); }
+  void Warning(SMLoc L, const Twine &Msg) {
+    return getParser().Warning(L, Msg);
+  }
+  bool Error(SMLoc L, const Twine &Msg) {
+    return getParser().Error(L, Msg);
+  }
+
+  const AsmToken &Lex() { return getParser().Lex(); }
+
+  const AsmToken &getTok() { return getParser().getTok(); }
+
+  bool TokError(const char *Msg) {
+    return getParser().TokError(Msg);
+  }
+
+  /// @}
+};
+
+} // End llvm namespace
+
+#endif