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annotate lib/CodeGen/LiveDebugVariables.h @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===- LiveDebugVariables.h - Tracking debug info variables ----*- 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 provides the interface to the LiveDebugVariables analysis.
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11 //
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12 // The analysis removes DBG_VALUE instructions for virtual registers and tracks
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13 // live user variables in a data structure that can be updated during register
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14 // allocation.
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15 //
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16 // After register allocation new DBG_VALUE instructions are emitted to reflect
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17 // the new locations of user variables.
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18 //
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19 //===----------------------------------------------------------------------===//
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20
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21 #ifndef LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
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22 #define LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
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23
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24 #include "llvm/ADT/ArrayRef.h"
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25 #include "llvm/CodeGen/MachineFunctionPass.h"
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26
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27 namespace llvm {
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28
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29 class LiveInterval;
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30 class LiveIntervals;
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31 class VirtRegMap;
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32
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33 class LiveDebugVariables : public MachineFunctionPass {
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34 void *pImpl;
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35 public:
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36 static char ID; // Pass identification, replacement for typeid
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37
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38 LiveDebugVariables();
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39 ~LiveDebugVariables();
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40
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41 /// renameRegister - Move any user variables in OldReg to NewReg:SubIdx.
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42 /// @param OldReg Old virtual register that is going away.
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43 /// @param NewReg New register holding the user variables.
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44 /// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub-
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45 /// register.
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46 void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
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47
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48 /// splitRegister - Move any user variables in OldReg to the live ranges in
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49 /// NewRegs where they are live. Mark the values as unavailable where no new
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50 /// register is live.
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51 void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
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52 LiveIntervals &LIS);
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53
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54 /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
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55 /// that happened during register allocation.
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56 /// @param VRM Rename virtual registers according to map.
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57 void emitDebugValues(VirtRegMap *VRM);
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58
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59 /// dump - Print data structures to dbgs().
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60 void dump();
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61
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62 private:
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63
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64 virtual bool runOnMachineFunction(MachineFunction &);
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65 virtual void releaseMemory();
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66 virtual void getAnalysisUsage(AnalysisUsage &) const;
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67
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68 };
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69
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70 } // namespace llvm
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71
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72 #endif // LLVM_CODEGEN_LIVEDEBUGVARIABLES_H