Spiller.h revision 10382fb71d8306f320ecbeb7049d25354c0e5457
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 <vector>
14
15namespace llvm {
16
17  class LiveInterval;
18  class LiveIntervals;
19  class LiveStacks;
20  class MachineFunction;
21  class MachineInstr;
22  class VirtRegMap;
23  class VNInfo;
24
25  /// Spiller interface.
26  ///
27  /// Implementations are utility classes which insert spill or remat code on
28  /// demand.
29  class Spiller {
30  public:
31    virtual ~Spiller() = 0;
32
33    /// Spill the given live range. The method used will depend on the Spiller
34    /// implementation selected.
35    virtual std::vector<LiveInterval*> spill(LiveInterval *li) = 0;
36
37    /// Intra-block split.
38    virtual std::vector<LiveInterval*> intraBlockSplit(LiveInterval *li,
39                                                       VNInfo *valno) = 0;
40
41  };
42
43  /// Create and return a spiller object, as specified on the command line.
44  Spiller* createSpiller(MachineFunction *mf, LiveIntervals *li,
45                         LiveStacks *ls, VirtRegMap *vrm);
46}
47
48#endif
49