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 ///
24 /// MCInstrInfo - Interface to description of machine instruction set
25 ///
26 class MCInstrInfo {
27   const MCInstrDesc *Desc;          // Raw array to allow static init'n
28   const unsigned *InstrNameIndices; // Array for name indices in InstrNameData
29   const char *InstrNameData;        // Instruction name string pool
30   unsigned NumOpcodes;              // Number of entries in the desc array
31 
32 public:
33   /// InitMCInstrInfo - Initialize MCInstrInfo, called by TableGen
34   /// auto-generated routines. *DO NOT USE*.
35   void InitMCInstrInfo(const MCInstrDesc *D, const unsigned *NI, const char *ND,
36                        unsigned NO) {
37     Desc = D;
38     InstrNameIndices = NI;
39     InstrNameData = ND;
40     NumOpcodes = NO;
41   }
42 
43   unsigned getNumOpcodes() const { return NumOpcodes; }
44 
45   /// get - Return the machine instruction descriptor that corresponds to the
46   /// specified instruction opcode.
47   ///
48   const MCInstrDesc &get(unsigned Opcode) const {
49     assert(Opcode < NumOpcodes && "Invalid opcode!");
50     return Desc[Opcode];
51   }
52 
53   /// getName - Returns the name for the instructions with the given opcode.
54   const char *getName(unsigned Opcode) const {
55     assert(Opcode < NumOpcodes && "Invalid opcode!");
56     return &InstrNameData[InstrNameIndices[Opcode]];
57   }
58 };
59 
60 } // End llvm namespace
61 
62 #endif
63