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annotate include/llvm/MC/MCInstrInfo.h @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 95c75e76d11b
children 1172e4bd9c6f
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1 //===-- llvm/MC/MCInstrInfo.h - Target Instruction Info ---------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file describes the target machine instruction set.
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11 //
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12 //===----------------------------------------------------------------------===//
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14 #ifndef LLVM_MC_MCINSTRINFO_H
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15 #define LLVM_MC_MCINSTRINFO_H
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16
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17 #include "llvm/MC/MCInstrDesc.h"
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18 #include <cassert>
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19
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20 namespace llvm {
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21
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22 //---------------------------------------------------------------------------
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23 /// \brief Interface to description of machine instruction set.
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24 class MCInstrInfo {
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25 const MCInstrDesc *Desc; // Raw array to allow static init'n
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26 const unsigned *InstrNameIndices; // Array for name indices in InstrNameData
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27 const char *InstrNameData; // Instruction name string pool
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28 unsigned NumOpcodes; // Number of entries in the desc array
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29
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30 public:
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31 /// \brief Initialize MCInstrInfo, called by TableGen auto-generated routines.
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32 /// *DO NOT USE*.
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33 void InitMCInstrInfo(const MCInstrDesc *D, const unsigned *NI, const char *ND,
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34 unsigned NO) {
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35 Desc = D;
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36 InstrNameIndices = NI;
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37 InstrNameData = ND;
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38 NumOpcodes = NO;
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39 }
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41 unsigned getNumOpcodes() const { return NumOpcodes; }
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42
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43 /// \brief Return the machine instruction descriptor that corresponds to the
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44 /// specified instruction opcode.
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45 const MCInstrDesc &get(unsigned Opcode) const {
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46 assert(Opcode < NumOpcodes && "Invalid opcode!");
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47 return Desc[Opcode];
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48 }
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49
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50 /// \brief Returns the name for the instructions with the given opcode.
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51 const char *getName(unsigned Opcode) const {
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52 assert(Opcode < NumOpcodes && "Invalid opcode!");
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53 return &InstrNameData[InstrNameIndices[Opcode]];
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54 }
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55 };
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56
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57 } // End llvm namespace
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58
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59 #endif