LiveDebugVariables.h revision 0613516b16466a92c68d60734801221506c85e86 
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/CodeGen/MachineFunctionPass.h"
25
26namespace llvm {
27
28class LiveDebugVariables : public MachineFunctionPass {
29  void *pImpl;
30public:
31  static char ID; // Pass identification, replacement for typeid
32
33  LiveDebugVariables();
34  ~LiveDebugVariables();
35
36  /// renameRegister - Move any user variables in OldReg to NewReg:SubIdx.
37  /// @param OldReg Old virtual register that is going away.
38  /// @param NewReg New register holding the user variables.
39  /// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub-
40  ///               register.
41  void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
42
43  /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
44  /// that happened during register allocation.
45  void emitDebugValues();
46
47private:
48
49  virtual bool runOnMachineFunction(MachineFunction &);
50  virtual void releaseMemory();
51  virtual void getAnalysisUsage(AnalysisUsage &) const;
52
53};
54
55} // namespace llvm
56
57#endif // LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
58