lib/CodeGen/Spiller.h

   1 //===-- llvm/CodeGen/Spiller.h - Spiller -*- C++ -*------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef LLVM_CODEGEN_SPILLER_H
  11 #define LLVM_CODEGEN_SPILLER_H
  12
  13 namespace llvm {
  14
  15   class LiveInterval;
  16   class MachineFunction;
  17   class MachineFunctionPass;
  18   class SlotIndex;
  19   template <typename T> class SmallVectorImpl;
  20   class VirtRegMap;
  21
  22   /// Spiller interface.
  23   ///
  24   /// Implementations are utility classes which insert spill or remat code on
  25   /// demand.
  26   class Spiller {
  27   public:
  28     virtual ~Spiller() = 0;
  29
  30     /// spill - Spill the given live interval. The method used will depend on
  31     /// the Spiller implementation selected.
  32     ///
  33     /// @param li            The live interval to be spilled.
  34     /// @param spillIs       A list of intervals that are about to be spilled,
  35     ///                      and so cannot be used for remat etc.
  36     /// @param newIntervals  The newly created intervals will be appended here.
  37     virtual void spill(LiveInterval *li,
  38                        SmallVectorImpl<LiveInterval*> &newIntervals,
  39                        SmallVectorImpl<LiveInterval*> &spillIs) = 0;
  40
  41   };
  42
  43   /// Create and return a spiller object, as specified on the command line.
  44   Spiller* createSpiller(MachineFunctionPass &pass,
  45                          MachineFunction &mf,
  46                          VirtRegMap &vrm);
  47 }
  48
  49 #endif