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//===----- 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
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