DroppedVariableStatsMIR.h

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///===- DroppedVariableStatsMIR.h - Opt Diagnostics -*- 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
/// Dropped Variable Statistics for Debug Information. Reports any number
/// of DBG_VALUEs that get dropped due to an optimization pass.
///
///===---------------------------------------------------------------------===//
 
#ifndef LLVM_CODEGEN_DROPPEDVARIABLESTATSMIR_H
#define LLVM_CODEGEN_DROPPEDVARIABLESTATSMIR_H
 
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/IR/DroppedVariableStats.h"
#include "llvm/Support/Compiler.h"
 
namespace llvm {
 
/// A class to collect and print dropped debug information due to MIR
/// optimization passes. After every MIR pass is run, it will print how many
/// #DBG_VALUEs were dropped due to that pass.
class LLVM_ABI DroppedVariableStatsMIR : public DroppedVariableStats {
public:
  DroppedVariableStatsMIR() : DroppedVariableStats(false) {}
 
  void runBeforePass(StringRef PassID, MachineFunction *MF);
 
  void runAfterPass(StringRef PassID, MachineFunction *MF);
 
private:
  const MachineFunction *MFunc;
  /// Populate DebugVariablesBefore or DebugVariablesAfter before or after a
  /// pass has run to facilitate dropped variable calculation for an
  /// llvm::MachineFunction.
  void runOnMachineFunction(const MachineFunction *MF, bool Before);
  /// Iterate over all Instructions in a MachineFunction and report any dropped
  /// debug information.
  void calculateDroppedVarStatsOnMachineFunction(const MachineFunction *MF,
                                                 StringRef PassID,
                                                 StringRef FuncOrModName);
  /// Override base class method to run on an llvm::MachineFunction
  /// specifically.
  void visitEveryInstruction(unsigned &DroppedCount, VarID Var) override;
  /// Override base class method to run on DBG_VALUEs specifically.
  void visitEveryDebugRecord(DenseSet<VarID> &VarIDSet) override;
};
 
} // namespace llvm
 
#endif