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      1 //===-- llvm/MC/MCInstrInfo.h - Target Instruction Info ---------*- 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 // This file describes the target machine instruction set.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #ifndef LLVM_MC_MCINSTRINFO_H
     15 #define LLVM_MC_MCINSTRINFO_H
     16 
     17 #include "llvm/MC/MCInstrDesc.h"
     18 #include <cassert>
     19 
     20 namespace llvm {
     21 
     22 //---------------------------------------------------------------------------
     23 /// \brief Interface to description of machine instruction set.
     24 class MCInstrInfo {
     25   const MCInstrDesc *Desc;          // Raw array to allow static init'n
     26   const unsigned *InstrNameIndices; // Array for name indices in InstrNameData
     27   const char *InstrNameData;        // Instruction name string pool
     28   unsigned NumOpcodes;              // Number of entries in the desc array
     29 
     30 public:
     31   /// \brief Initialize MCInstrInfo, called by TableGen auto-generated routines.
     32   /// *DO NOT USE*.
     33   void InitMCInstrInfo(const MCInstrDesc *D, const unsigned *NI, const char *ND,
     34                        unsigned NO) {
     35     Desc = D;
     36     InstrNameIndices = NI;
     37     InstrNameData = ND;
     38     NumOpcodes = NO;
     39   }
     40 
     41   unsigned getNumOpcodes() const { return NumOpcodes; }
     42 
     43   /// \brief Return the machine instruction descriptor that corresponds to the
     44   /// specified instruction opcode.
     45   const MCInstrDesc &get(unsigned Opcode) const {
     46     assert(Opcode < NumOpcodes && "Invalid opcode!");
     47     return Desc[Opcode];
     48   }
     49 
     50   /// \brief Returns the name for the instructions with the given opcode.
     51   const char *getName(unsigned Opcode) const {
     52     assert(Opcode < NumOpcodes && "Invalid opcode!");
     53     return &InstrNameData[InstrNameIndices[Opcode]];
     54   }
     55 };
     56 
     57 } // End llvm namespace
     58 
     59 #endif
     60