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//===-- llvm/CodeGen/Spiller.h - Spiller -*- C++ -*------------------------===//
//                     The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.


namespace llvm {

  class LiveInterval;
  class MachineFunction;
  class MachineFunctionPass;
  class SlotIndex;
  template <typename T> class SmallVectorImpl;
  class VirtRegMap;

  /// Spiller interface.
  /// Implementations are utility classes which insert spill or remat code on
  /// demand.
  class Spiller {
    virtual ~Spiller() = 0;

    /// spill - Spill the given live interval. The method used will depend on
    /// the Spiller implementation selected.
    /// @param li            The live interval to be spilled.
    /// @param spillIs       A list of intervals that are about to be spilled,
    ///                      and so cannot be used for remat etc.
    /// @param newIntervals  The newly created intervals will be appended here.
    virtual void spill(LiveInterval *li,
                       SmallVectorImpl<LiveInterval*> &newIntervals,
                       const SmallVectorImpl<LiveInterval*> &spillIs) = 0;


  /// Create and return a spiller object, as specified on the command line.
  Spiller* createSpiller(MachineFunctionPass &pass,
                         MachineFunction &mf,
                         VirtRegMap &vrm);

  /// Create and return a spiller that will insert spill code directly instead
  /// of deferring though VirtRegMap.
  Spiller *createInlineSpiller(MachineFunctionPass &pass,
                               MachineFunction &mf,
                               VirtRegMap &vrm);