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      1 //===-- MBlazeAsmLexer.cpp - Tokenize MBlaze assembly to AsmTokens --------===//
      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 #include "MCTargetDesc/MBlazeBaseInfo.h"
     11 
     12 #include "llvm/ADT/OwningPtr.h"
     13 #include "llvm/ADT/SmallVector.h"
     14 #include "llvm/ADT/StringExtras.h"
     15 
     16 #include "llvm/MC/MCAsmInfo.h"
     17 #include "llvm/MC/MCParser/MCAsmLexer.h"
     18 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
     19 #include "llvm/MC/MCRegisterInfo.h"
     20 #include "llvm/MC/MCTargetAsmLexer.h"
     21 
     22 #include "llvm/Support/TargetRegistry.h"
     23 
     24 #include <string>
     25 #include <map>
     26 
     27 using namespace llvm;
     28 
     29 namespace {
     30 
     31   class MBlazeBaseAsmLexer : public MCTargetAsmLexer {
     32     const MCAsmInfo &AsmInfo;
     33 
     34     const AsmToken &lexDefinite() {
     35       return getLexer()->Lex();
     36     }
     37 
     38     AsmToken LexTokenUAL();
     39   protected:
     40     typedef std::map <std::string, unsigned> rmap_ty;
     41 
     42     rmap_ty RegisterMap;
     43 
     44     void InitRegisterMap(const MCRegisterInfo *info) {
     45       unsigned numRegs = info->getNumRegs();
     46 
     47       for (unsigned i = 0; i < numRegs; ++i) {
     48         const char *regName = info->getName(i);
     49         if (regName)
     50           RegisterMap[regName] = i;
     51       }
     52     }
     53 
     54     unsigned MatchRegisterName(StringRef Name) {
     55       rmap_ty::iterator iter = RegisterMap.find(Name.str());
     56       if (iter != RegisterMap.end())
     57         return iter->second;
     58       else
     59         return 0;
     60     }
     61 
     62     AsmToken LexToken() {
     63       if (!Lexer) {
     64         SetError(SMLoc(), "No MCAsmLexer installed");
     65         return AsmToken(AsmToken::Error, "", 0);
     66       }
     67 
     68       switch (AsmInfo.getAssemblerDialect()) {
     69       default:
     70         SetError(SMLoc(), "Unhandled dialect");
     71         return AsmToken(AsmToken::Error, "", 0);
     72       case 0:
     73         return LexTokenUAL();
     74       }
     75     }
     76   public:
     77     MBlazeBaseAsmLexer(const Target &T, const MCAsmInfo &MAI)
     78       : MCTargetAsmLexer(T), AsmInfo(MAI) {
     79     }
     80   };
     81 
     82   class MBlazeAsmLexer : public MBlazeBaseAsmLexer {
     83   public:
     84     MBlazeAsmLexer(const Target &T, const MCRegisterInfo &MRI,
     85                    const MCAsmInfo &MAI)
     86       : MBlazeBaseAsmLexer(T, MAI) {
     87       InitRegisterMap(&MRI);
     88     }
     89   };
     90 }
     91 
     92 AsmToken MBlazeBaseAsmLexer::LexTokenUAL() {
     93   const AsmToken &lexedToken = lexDefinite();
     94 
     95   switch (lexedToken.getKind()) {
     96   default:
     97     return AsmToken(lexedToken);
     98   case AsmToken::Error:
     99     SetError(Lexer->getErrLoc(), Lexer->getErr());
    100     return AsmToken(lexedToken);
    101   case AsmToken::Identifier:
    102   {
    103     std::string upperCase = lexedToken.getString().str();
    104     std::string lowerCase = LowercaseString(upperCase);
    105     StringRef lowerRef(lowerCase);
    106 
    107     unsigned regID = MatchRegisterName(lowerRef);
    108 
    109     if (regID) {
    110       return AsmToken(AsmToken::Register,
    111                       lexedToken.getString(),
    112                       static_cast<int64_t>(regID));
    113     } else {
    114       return AsmToken(lexedToken);
    115     }
    116   }
    117   }
    118 }
    119 
    120 extern "C" void LLVMInitializeMBlazeAsmLexer() {
    121   RegisterMCAsmLexer<MBlazeAsmLexer> X(TheMBlazeTarget);
    122 }
    123 
    124