1 //===-- llvm/MC/MCInstrInfo.h - Target Instruction Info ---------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file describes the target machine instruction set. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_MC_MCINSTRINFO_H 14 #define LLVM_MC_MCINSTRINFO_H 15 16 #include "llvm/MC/MCInstrDesc.h" 17 #include <cassert> 18 19 namespace llvm { 20 21 //--------------------------------------------------------------------------- 22 /// Interface to description of machine instruction set. 23 class MCInstrInfo { 24 const MCInstrDesc *Desc; // Raw array to allow static init'n 25 const unsigned *InstrNameIndices; // Array for name indices in InstrNameData 26 const char *InstrNameData; // Instruction name string pool 27 unsigned NumOpcodes; // Number of entries in the desc array 28 29 public: 30 /// Initialize MCInstrInfo, called by TableGen auto-generated routines. 31 /// *DO NOT USE*. InitMCInstrInfo(const MCInstrDesc * D,const unsigned * NI,const char * ND,unsigned NO)32 void InitMCInstrInfo(const MCInstrDesc *D, const unsigned *NI, const char *ND, 33 unsigned NO) { 34 Desc = D; 35 InstrNameIndices = NI; 36 InstrNameData = ND; 37 NumOpcodes = NO; 38 } 39 getNumOpcodes()40 unsigned getNumOpcodes() const { return NumOpcodes; } 41 42 /// Return the machine instruction descriptor that corresponds to the 43 /// specified instruction opcode. get(unsigned Opcode)44 const MCInstrDesc &get(unsigned Opcode) const { 45 assert(Opcode < NumOpcodes && "Invalid opcode!"); 46 return Desc[Opcode]; 47 } 48 49 /// Returns the name for the instructions with the given opcode. getName(unsigned Opcode)50 StringRef getName(unsigned Opcode) const { 51 assert(Opcode < NumOpcodes && "Invalid opcode!"); 52 return StringRef(&InstrNameData[InstrNameIndices[Opcode]]); 53 } 54 }; 55 56 } // End llvm namespace 57 58 #endif 59