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      1 //===-- llvm/MC/MCAsmParserExtension.h - Asm Parser Hooks -------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 #ifndef LLVM_MC_MCPARSER_MCASMPARSEREXTENSION_H
     11 #define LLVM_MC_MCPARSER_MCASMPARSEREXTENSION_H
     12 
     13 #include "llvm/ADT/StringRef.h"
     14 #include "llvm/MC/MCParser/MCAsmParser.h"
     15 #include "llvm/Support/SMLoc.h"
     16 
     17 namespace llvm {
     18 class Twine;
     19 
     20 /// \brief Generic interface for extending the MCAsmParser,
     21 /// which is implemented by target and object file assembly parser
     22 /// implementations.
     23 class MCAsmParserExtension {
     24   MCAsmParserExtension(const MCAsmParserExtension &) LLVM_DELETED_FUNCTION;
     25   void operator=(const MCAsmParserExtension &) LLVM_DELETED_FUNCTION;
     26 
     27   MCAsmParser *Parser;
     28 
     29 protected:
     30   MCAsmParserExtension();
     31 
     32   // Helper template for implementing static dispatch functions.
     33   template<typename T, bool (T::*Handler)(StringRef, SMLoc)>
     34   static bool HandleDirective(MCAsmParserExtension *Target,
     35                               StringRef Directive,
     36                               SMLoc DirectiveLoc) {
     37     T *Obj = static_cast<T*>(Target);
     38     return (Obj->*Handler)(Directive, DirectiveLoc);
     39   }
     40 
     41   bool BracketExpressionsSupported;
     42 
     43 public:
     44   virtual ~MCAsmParserExtension();
     45 
     46   /// \brief Initialize the extension for parsing using the given \p Parser.
     47   /// The extension should use the AsmParser interfaces to register its
     48   /// parsing routines.
     49   virtual void Initialize(MCAsmParser &Parser);
     50 
     51   /// @name MCAsmParser Proxy Interfaces
     52   /// @{
     53 
     54   MCContext &getContext() { return getParser().getContext(); }
     55   MCAsmLexer &getLexer() { return getParser().getLexer(); }
     56   MCAsmParser &getParser() { return *Parser; }
     57   SourceMgr &getSourceManager() { return getParser().getSourceManager(); }
     58   MCStreamer &getStreamer() { return getParser().getStreamer(); }
     59   bool Warning(SMLoc L, const Twine &Msg) {
     60     return getParser().Warning(L, Msg);
     61   }
     62   bool Error(SMLoc L, const Twine &Msg) {
     63     return getParser().Error(L, Msg);
     64   }
     65   bool TokError(const Twine &Msg) {
     66     return getParser().TokError(Msg);
     67   }
     68 
     69   const AsmToken &Lex() { return getParser().Lex(); }
     70 
     71   const AsmToken &getTok() { return getParser().getTok(); }
     72 
     73   bool HasBracketExpressions() const { return BracketExpressionsSupported; }
     74 
     75   /// @}
     76 };
     77 
     78 } // End llvm namespace
     79 
     80 #endif
     81