Spiller.h revision 210299 
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#include <vector>
15
16namespace llvm {
17
18  class LiveInterval;
19  class LiveIntervals;
20  class LiveStacks;
21  class MachineFunction;
22  class MachineInstr;
23  class MachineLoopInfo;
24  class SlotIndex;
25  class VirtRegMap;
26  class VNInfo;
27
28  /// Spiller interface.
29  ///
30  /// Implementations are utility classes which insert spill or remat code on
31  /// demand.
32  class Spiller {
33  public:
34    virtual ~Spiller() = 0;
35
36    /// spill - Spill the given live interval. The method used will depend on
37    /// the Spiller implementation selected.
38    ///
39    /// @param li            The live interval to be spilled.
40    /// @param spillIs       A list of intervals that are about to be spilled,
41    ///                      and so cannot be used for remat etc.
42    /// @param newIntervals  The newly created intervals will be appended here.
43    /// @param earliestIndex The earliest point for splitting. (OK, it's another
44    ///                      pointer to the allocator guts).
45    virtual void spill(LiveInterval *li,
46                       std::vector<LiveInterval*> &newIntervals,
47                       SmallVectorImpl<LiveInterval*> &spillIs,
48                       SlotIndex *earliestIndex = 0) = 0;
49
50  };
51
52  /// Create and return a spiller object, as specified on the command line.
53  Spiller* createSpiller(MachineFunction *mf, LiveIntervals *li,
54                         const MachineLoopInfo *loopInfo, VirtRegMap *vrm);
55}
56
57#endif
58