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annotate lib/CodeGen/LiveDebugVariables.h @ 100:7d135dc70f03 LLVM 3.9

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LLVM 3.9
author Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
date Tue, 26 Jan 2016 22:53:40 +0900
parents afa8332a0e37
children 1172e4bd9c6f
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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_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
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22 #define LLVM_LIB_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 #include "llvm/IR/DebugInfo.h"
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27
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28 namespace llvm {
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29
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30 class LiveInterval;
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31 class LiveIntervals;
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32 class VirtRegMap;
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33
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34 class LLVM_LIBRARY_VISIBILITY LiveDebugVariables : public MachineFunctionPass {
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35 void *pImpl;
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36
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37 public:
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38 static char ID; // Pass identification, replacement for typeid
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39
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40 LiveDebugVariables();
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41 ~LiveDebugVariables() override;
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42
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43 /// renameRegister - Move any user variables in OldReg to NewReg:SubIdx.
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44 /// @param OldReg Old virtual register that is going away.
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45 /// @param NewReg New register holding the user variables.
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46 /// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub-
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47 /// register.
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48 void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
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49
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50 /// splitRegister - Move any user variables in OldReg to the live ranges in
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51 /// NewRegs where they are live. Mark the values as unavailable where no new
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52 /// register is live.
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53 void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
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54 LiveIntervals &LIS);
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55
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56 /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
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57 /// that happened during register allocation.
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58 /// @param VRM Rename virtual registers according to map.
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59 void emitDebugValues(VirtRegMap *VRM);
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60
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61 /// dump - Print data structures to dbgs().
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62 void dump();
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63
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64 private:
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65
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66 bool runOnMachineFunction(MachineFunction &) override;
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67 void releaseMemory() override;
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68 void getAnalysisUsage(AnalysisUsage &) const override;
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69 bool doInitialization(Module &) override;
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70
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71 };
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72
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73 } // namespace llvm
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74
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75 #endif