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 class MCSubtargetInfo; 22 23 //--------------------------------------------------------------------------- 24 /// Interface to description of machine instruction set. 25 class MCInstrInfo { 26 public: 27 using ComplexDeprecationPredicate = bool (*)(MCInst &, 28 const MCSubtargetInfo &, 29 std::string &); 30 31 private: 32 const MCInstrDesc *Desc; // Raw array to allow static init'n 33 const unsigned *InstrNameIndices; // Array for name indices in InstrNameData 34 const char *InstrNameData; // Instruction name string pool 35 // Subtarget feature that an instruction is deprecated on, if any 36 // -1 implies this is not deprecated by any single feature. It may still be 37 // deprecated due to a "complex" reason, below. 38 const uint8_t *DeprecatedFeatures; 39 // A complex method to determine if a certain instruction is deprecated or 40 // not, and return the reason for deprecation. 41 const ComplexDeprecationPredicate *ComplexDeprecationInfos; 42 unsigned NumOpcodes; // Number of entries in the desc array 43 44 public: 45 /// Initialize MCInstrInfo, called by TableGen auto-generated routines. 46 /// *DO NOT USE*. InitMCInstrInfo(const MCInstrDesc * D,const unsigned * NI,const char * ND,const uint8_t * DF,const ComplexDeprecationPredicate * CDI,unsigned NO)47 void InitMCInstrInfo(const MCInstrDesc *D, const unsigned *NI, const char *ND, 48 const uint8_t *DF, 49 const ComplexDeprecationPredicate *CDI, unsigned NO) { 50 Desc = D; 51 InstrNameIndices = NI; 52 InstrNameData = ND; 53 DeprecatedFeatures = DF; 54 ComplexDeprecationInfos = CDI; 55 NumOpcodes = NO; 56 } 57 getNumOpcodes()58 unsigned getNumOpcodes() const { return NumOpcodes; } 59 60 /// Return the machine instruction descriptor that corresponds to the 61 /// specified instruction opcode. get(unsigned Opcode)62 const MCInstrDesc &get(unsigned Opcode) const { 63 assert(Opcode < NumOpcodes && "Invalid opcode!"); 64 return Desc[Opcode]; 65 } 66 67 /// Returns the name for the instructions with the given opcode. getName(unsigned Opcode)68 StringRef getName(unsigned Opcode) const { 69 assert(Opcode < NumOpcodes && "Invalid opcode!"); 70 return StringRef(&InstrNameData[InstrNameIndices[Opcode]]); 71 } 72 73 /// Returns true if a certain instruction is deprecated and if so 74 /// returns the reason in \p Info. 75 bool getDeprecatedInfo(MCInst &MI, const MCSubtargetInfo &STI, 76 std::string &Info) const; 77 }; 78 79 } // End llvm namespace 80 81 #endif 82