RDFCopy.h revision 293838 
1//===--- RDFCopy.h --------------------------------------------------------===//
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 RDF_COPY_H
11#define RDF_COPY_H
12
13#include "RDFGraph.h"
14#include <map>
15#include <vector>
16
17namespace llvm {
18  class MachineBasicBlock;
19  class MachineDominatorTree;
20  class MachineInstr;
21}
22
23namespace rdf {
24  struct CopyPropagation {
25    CopyPropagation(DataFlowGraph &dfg) : MDT(dfg.getDT()), DFG(dfg),
26        Trace(false) {}
27
28    bool run();
29    void trace(bool On) { Trace = On; }
30    bool trace() const { return Trace; }
31
32  private:
33    const MachineDominatorTree &MDT;
34    DataFlowGraph &DFG;
35    DataFlowGraph::DefStackMap DefM;
36    bool Trace;
37
38    // map: register -> (map: stmt -> reaching def)
39    std::map<RegisterRef,std::map<NodeId,NodeId>> RDefMap;
40    std::vector<NodeId> Copies;
41
42    void recordCopy(NodeAddr<StmtNode*> SA, MachineInstr *MI);
43    void updateMap(NodeAddr<InstrNode*> IA);
44    bool scanBlock(MachineBasicBlock *B);
45  };
46}
47
48#endif
49