Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===----- llvm/CodeGen/GlobalISel/LostDebugLocObserver.h -------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

/// \file

/// Tracks DebugLocs between checkpoints and verifies that they are transferred.

///

//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_GLOBALISEL_LOSTDEBUGLOCOBSERVER_H

#define LLVM_CODEGEN_GLOBALISEL_LOSTDEBUGLOCOBSERVER_H

#include "llvm/ADT/SmallSet.h"

#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"

namespace llvm {

class LostDebugLocObserver : public GISelChangeObserver {

  StringRef DebugType;

  SmallSet<DebugLoc, 4> LostDebugLocs;

  SmallPtrSet<MachineInstr *, 4> PotentialMIsForDebugLocs;

  unsigned NumLostDebugLocs = 0;

public:

  LostDebugLocObserver(StringRef DebugType) : DebugType(DebugType) {}

  unsigned getNumLostDebugLocs() const { return NumLostDebugLocs; }

  /// Call this to indicate that it's a good point to assess whether locations

  /// have been lost. Typically this will be when a logical change has been

  /// completed such as the caller has finished replacing some instructions with

  /// alternatives. When CheckDebugLocs is true, the locations will be checked

  /// to see if any have been lost since the last checkpoint. When

  /// CheckDebugLocs is false, it will just reset ready for the next checkpoint

  /// without checking anything. This can be helpful to limit the detection to

  /// easy-to-fix portions of an algorithm before allowing more difficult ones.

  void checkpoint(bool CheckDebugLocs = true);

  void createdInstr(MachineInstr &MI) override;

  void erasingInstr(MachineInstr &MI) override;

  void changingInstr(MachineInstr &MI) override;

  void changedInstr(MachineInstr &MI) override;

private:

  void analyzeDebugLocations();

};

} // namespace llvm

#endif // LLVM_CODEGEN_GLOBALISEL_LOSTDEBUGLOCOBSERVER_H