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
20namespace llvm {
21
22//---------------------------------------------------------------------------
23/// \brief Interface to description of machine instruction set.
24class 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
30public:
31  /// \brief Initialize MCInstrInfo, called by TableGen auto-generated routines.
32  /// *DO NOT USE*.
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
41  unsigned getNumOpcodes() const { return NumOpcodes; }
42
43  /// \brief Return the machine instruction descriptor that corresponds to the
44  /// specified instruction 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.
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