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comparison lib/CodeGen/LiveDebugVariables.h @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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-1:000000000000 0:95c75e76d11b
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"
25 #include "llvm/CodeGen/MachineFunctionPass.h"
26
27 namespace llvm {
28
29 class LiveInterval;
30 class LiveIntervals;
31 class VirtRegMap;
32
33 class LiveDebugVariables : public MachineFunctionPass {
34 void *pImpl;
35 public:
36 static char ID; // Pass identification, replacement for typeid
37
38 LiveDebugVariables();
39 ~LiveDebugVariables();
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