1 //===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- 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 // This file declares the Mips specific subclass of MachineFunctionInfo.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef MIPS_MACHINE_FUNCTION_INFO_H
15 #define MIPS_MACHINE_FUNCTION_INFO_H
16 
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/CodeGen/MachineFrameInfo.h"
19 #include <utility>
20 
21 namespace llvm {
22 
23 /// MipsFunctionInfo - This class is derived from MachineFunction private
24 /// Mips target-specific information for each MachineFunction.
25 class MipsFunctionInfo : public MachineFunctionInfo {
26   virtual void anchor();
27 
28   MachineFunction& MF;
29   /// SRetReturnReg - Some subtargets require that sret lowering includes
30   /// returning the value of the returned struct in a register. This field
31   /// holds the virtual register into which the sret argument is passed.
32   unsigned SRetReturnReg;
33 
34   /// GlobalBaseReg - keeps track of the virtual register initialized for
35   /// use as the global base register. This is used for PIC in some PIC
36   /// relocation models.
37   unsigned GlobalBaseReg;
38 
39   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
40   int VarArgsFrameIndex;
41 
42   // Range of frame object indices.
43   // InArgFIRange: Range of indices of all frame objects created during call to
44   //               LowerFormalArguments.
45   // OutArgFIRange: Range of indices of all frame objects created during call to
46   //                LowerCall except for the frame object for restoring $gp.
47   std::pair<int, int> InArgFIRange, OutArgFIRange;
48   mutable int DynAllocFI; // Frame index of dynamically allocated stack area.
49   unsigned MaxCallFrameSize;
50 
51   bool EmitNOAT;
52 
53 public:
54   MipsFunctionInfo(MachineFunction& MF)
55   : MF(MF), SRetReturnReg(0), GlobalBaseReg(0),
56     VarArgsFrameIndex(0), InArgFIRange(std::make_pair(-1, 0)),
57     OutArgFIRange(std::make_pair(-1, 0)), DynAllocFI(0),
58     MaxCallFrameSize(0), EmitNOAT(false)
59   {}
60 
61   bool isInArgFI(int FI) const {
62     return FI <= InArgFIRange.first && FI >= InArgFIRange.second;
63   }
64   void setLastInArgFI(int FI) { InArgFIRange.second = FI; }
65 
66   bool isOutArgFI(int FI) const {
67     return FI <= OutArgFIRange.first && FI >= OutArgFIRange.second;
68   }
69   void extendOutArgFIRange(int FirstFI, int LastFI) {
70     if (!OutArgFIRange.second)
71       // this must be the first time this function was called.
72       OutArgFIRange.first = FirstFI;
73     OutArgFIRange.second = LastFI;
74   }
75 
76   // The first call to this function creates a frame object for dynamically
77   // allocated stack area.
78   int getDynAllocFI() const {
79     if (!DynAllocFI)
80       DynAllocFI = MF.getFrameInfo()->CreateFixedObject(4, 0, true);
81 
82     return DynAllocFI;
83   }
84   bool isDynAllocFI(int FI) const { return DynAllocFI && DynAllocFI == FI; }
85 
86   unsigned getSRetReturnReg() const { return SRetReturnReg; }
87   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
88 
89   bool globalBaseRegSet() const;
90   unsigned getGlobalBaseReg();
91 
92   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
93   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
94 
95   unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
96   void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
97 
98   bool getEmitNOAT() const { return EmitNOAT; }
99   void setEmitNOAT() { EmitNOAT = true; }
100 };
101 
102 } // end of namespace llvm
103 
104 #endif // MIPS_MACHINE_FUNCTION_INFO_H
105