LLVM  9.0.0svn
LiveDebugVariables.h
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1 //===- LiveDebugVariables.h - Tracking debug info variables -----*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file provides the interface to the LiveDebugVariables analysis.
10 //
11 // The analysis removes DBG_VALUE instructions for virtual registers and tracks
12 // live user variables in a data structure that can be updated during register
13 // allocation.
14 //
15 // After register allocation new DBG_VALUE instructions are emitted to reflect
16 // the new locations of user variables.
17 //
18 //===----------------------------------------------------------------------===//
19 
20 #ifndef LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
21 #define LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
22 
24 #include "llvm/Support/Compiler.h"
25 
26 namespace llvm {
27 
28 template <typename T> class ArrayRef;
29 class LiveIntervals;
30 class VirtRegMap;
31 
33  void *pImpl = nullptr;
34 
35 public:
36  static char ID; // Pass identification, replacement for typeid
37 
39  ~LiveDebugVariables() override;
40 
41  /// splitRegister - Move any user variables in OldReg to the live ranges in
42  /// NewRegs where they are live. Mark the values as unavailable where no new
43  /// register is live.
44  void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
45  LiveIntervals &LIS);
46 
47  /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
48  /// that happened during register allocation.
49  /// @param VRM Rename virtual registers according to map.
50  void emitDebugValues(VirtRegMap *VRM);
51 
52  /// dump - Print data structures to dbgs().
53  void dump() const;
54 
55 private:
56  bool runOnMachineFunction(MachineFunction &) override;
57  void releaseMemory() override;
58  void getAnalysisUsage(AnalysisUsage &) const override;
59  bool doInitialization(Module &) override;
60 };
61 
62 } // end namespace llvm
63 
64 #endif // LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
This class represents lattice values for constants.
Definition: AllocatorList.h:23
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:64
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:107