Spiller.h revision 212904 
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#include "llvm/ADT/SmallVector.h"
14
15namespace llvm {
16
17  class LiveInterval;
18  class MachineFunction;
19  class MachineFunctionPass;
20  class SlotIndex;
21  class VirtRegMap;
22
23  /// Spiller interface.
24  ///
25  /// Implementations are utility classes which insert spill or remat code on
26  /// demand.
27  class Spiller {
28  public:
29    virtual ~Spiller() = 0;
30
31    /// spill - Spill the given live interval. The method used will depend on
32    /// the Spiller implementation selected.
33    ///
34    /// @param li            The live interval to be spilled.
35    /// @param spillIs       A list of intervals that are about to be spilled,
36    ///                      and so cannot be used for remat etc.
37    /// @param newIntervals  The newly created intervals will be appended here.
38    virtual void spill(LiveInterval *li,
39                       SmallVectorImpl<LiveInterval*> &newIntervals,
40                       SmallVectorImpl<LiveInterval*> &spillIs) = 0;
41
42  };
43
44  /// Create and return a spiller object, as specified on the command line.
45  Spiller* createSpiller(MachineFunctionPass &pass,
46                         MachineFunction &mf,
47                         VirtRegMap &vrm);
48}
49
50#endif
51