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 StringRef getName(unsigned Opcode) const { 52 assert(Opcode < NumOpcodes && "Invalid opcode!"); 53 return StringRef(&InstrNameData[InstrNameIndices[Opcode]]); 54 } 55 }; 56 57 } // End llvm namespace 58 59 #endif 60
