include/llvm/MC/MCInstrInfo.h

   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*.
  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
  40   unsigned getNumOpcodes() const { return NumOpcodes; }
  41
  42   /// Return the machine instruction descriptor that corresponds to the
  43   /// specified instruction 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.
  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