//===----------------------- View.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
///
/// This file defines the main interface for Views. Each view contributes a
/// portion of the final report generated by the tool.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_TOOLS_LLVM_MCA_VIEW_H
#define LLVM_TOOLS_LLVM_MCA_VIEW_H

#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MCA/HWEventListener.h"
#include "llvm/Support/raw_ostream.h"

namespace llvm {
namespace mca {

class View : public HWEventListener {
public:
  virtual void printView(llvm::raw_ostream &OS) const = 0;
  virtual ~View() = default;
  void anchor() override;
};

// The base class for views that deal with individual machine instructions.
class InstructionView : public View {
  const llvm::MCSubtargetInfo &STI;
  llvm::MCInstPrinter &MCIP;
  llvm::ArrayRef<llvm::MCInst> Source;

  mutable std::string InstructionString;
  mutable raw_string_ostream InstrStream;

protected:
  InstructionView(const llvm::MCSubtargetInfo &STI,
                  llvm::MCInstPrinter &Printer,
                  llvm::ArrayRef<llvm::MCInst> S)
      : STI(STI), MCIP(Printer), Source(S), InstrStream(InstructionString) {}

  virtual ~InstructionView() = default;

  // Return a reference to a string representing a given machine instruction.
  // The result should be used or copied before the next call to
  // printInstructionString() as it will overwrite the previous result.
  StringRef printInstructionString(const llvm::MCInst &MCI) const;
  
  const llvm::MCSubtargetInfo &getSubTargetInfo() const { return STI; }
  llvm::MCInstPrinter &getInstPrinter() const { return MCIP; }
  llvm::ArrayRef<llvm::MCInst> getSource() const { return Source; }
};
} // namespace mca
} // namespace llvm

#endif