LLVM  3.7.0
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_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
22 #define LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
23 
24 #include "llvm/ADT/ArrayRef.h"
26 #include "llvm/IR/DebugInfo.h"
27 
28 namespace llvm {
29 
30 class LiveInterval;
31 class LiveIntervals;
32 class VirtRegMap;
33 
35  void *pImpl;
37 
38 public:
39  static char ID; // Pass identification, replacement for typeid
40 
42  ~LiveDebugVariables() override;
43 
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-
48  /// register.
49  void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
50 
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
53  /// register is live.
54  void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
55  LiveIntervals &LIS);
56 
57  /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
58  /// that happened during register allocation.
59  /// @param VRM Rename virtual registers according to map.
60  void emitDebugValues(VirtRegMap *VRM);
61 
62  /// dump - Print data structures to dbgs().
63  void dump();
64 
65 private:
66 
67  bool runOnMachineFunction(MachineFunction &) override;
68  void releaseMemory() override;
69  void getAnalysisUsage(AnalysisUsage &) const override;
70  bool doInitialization(Module &) override;
71 
72 };
73 
74 } // namespace llvm
75 
76 #endif
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:114
MachineFunctionPass - This class adapts the FunctionPass interface to allow convenient creation of pa...
void dump(const SparseBitVector< ElementSize > &LHS, raw_ostream &out)
Represent the analysis usage information of a pass.
#define LLVM_LIBRARY_VISIBILITY
LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked into a shared library...
Definition: Compiler.h:110