1 //===- LiveDebugVariables.h - Tracking debug info variables ----*- c++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides the interface to the LiveDebugVariables analysis.
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
16 // After register allocation new DBG_VALUE instructions are emitted to reflect
17 // the new locations of user variables.
19 //===----------------------------------------------------------------------===//
21 #ifndef LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
22 #define LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
24 #include "llvm/ADT/ArrayRef.h"
25 #include "llvm/CodeGen/MachineFunctionPass.h"
32 class LiveDebugVariables : public MachineFunctionPass {
34 /// Whether emitDebugValues is called.
36 /// Whether the machine function is modified during the pass.
39 static char ID; // Pass identification, replacement for typeid
42 ~LiveDebugVariables();
44 /// renameRegister - Move any user variables in OldReg to NewReg:SubIdx.
45 /// @param OldReg Old virtual register that is going away.
46 /// @param NewReg New register holding the user variables.
47 /// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub-
49 void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
51 /// splitRegister - Move any user variables in OldReg to the live ranges in
52 /// NewRegs where they are live. Mark the values as unavailable where no new
54 void splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs);
56 /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
57 /// that happened during register allocation.
58 /// @param VRM Rename virtual registers according to map.
59 void emitDebugValues(VirtRegMap *VRM);
61 /// dump - Print data structures to dbgs().
66 virtual bool runOnMachineFunction(MachineFunction &);
67 virtual void releaseMemory();
68 virtual void getAnalysisUsage(AnalysisUsage &) const;
74 #endif // LLVM_CODEGEN_LIVEDEBUGVARIABLES_H