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