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1 //===-------------- llvm/CodeGen/ProcessImplicitDefs.h ----------*- 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 
11 #ifndef LLVM_CODEGEN_PROCESSIMPLICITDEFS_H
12 #define LLVM_CODEGEN_PROCESSIMPLICITDEFS_H
13 
14 #include "llvm/CodeGen/MachineFunctionPass.h"
15 #include "llvm/ADT/SmallSet.h"
16 
17 namespace llvm {
18 
19   class MachineInstr;
20   class TargetInstrInfo;
21   class TargetRegisterInfo;
22   class MachineRegisterInfo;
23   class LiveVariables;
24 
25   /// Process IMPLICIT_DEF instructions and make sure there is one implicit_def
26   /// for each use. Add isUndef marker to implicit_def defs and their uses.
27   class ProcessImplicitDefs : public MachineFunctionPass {
28     const TargetInstrInfo *TII;
29     const TargetRegisterInfo *TRI;
30     MachineRegisterInfo *MRI;
31     LiveVariables *LV;
32 
33     bool CanTurnIntoImplicitDef(MachineInstr *MI, unsigned Reg,
34                                 unsigned OpIdx,
35                                 SmallSet<unsigned, 8> &ImpDefRegs);
36 
37   public:
38     static char ID;
39 
ProcessImplicitDefs()40     ProcessImplicitDefs() : MachineFunctionPass(ID) {
41       initializeProcessImplicitDefsPass(*PassRegistry::getPassRegistry());
42     }
43 
44     virtual void getAnalysisUsage(AnalysisUsage &au) const;
45 
46     virtual bool runOnMachineFunction(MachineFunction &fn);
47   };
48 
49 }
50 
51 #endif // LLVM_CODEGEN_PROCESSIMPLICITDEFS_H
52