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*.
InitMCInstrInfo(const MCInstrDesc * D,const unsigned * NI,const char * ND,unsigned NO)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 
getNumOpcodes()41   unsigned getNumOpcodes() const { return NumOpcodes; }
42 
43   /// \brief Return the machine instruction descriptor that corresponds to the
44   /// specified instruction opcode.
get(unsigned 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.
getName(unsigned 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