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 "MipsSubtarget.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
20 #include "llvm/Target/TargetFrameLowering.h"
21 #include "llvm/Target/TargetMachine.h"
22 #include <utility>
23 
24 namespace llvm {
25 
26 /// MipsFunctionInfo - This class is derived from MachineFunction private
27 /// Mips target-specific information for each MachineFunction.
28 class MipsFunctionInfo : public MachineFunctionInfo {
29   virtual void anchor();
30 
31   MachineFunction& MF;
32   /// SRetReturnReg - Some subtargets require that sret lowering includes
33   /// returning the value of the returned struct in a register. This field
34   /// holds the virtual register into which the sret argument is passed.
35   unsigned SRetReturnReg;
36 
37   /// GlobalBaseReg - keeps track of the virtual register initialized for
38   /// use as the global base register. This is used for PIC in some PIC
39   /// relocation models.
40   unsigned GlobalBaseReg;
41 
42   /// Mips16SPAliasReg - keeps track of the virtual register initialized for
43   /// use as an alias for SP for use in load/store of halfword/byte from/to
44   /// the stack
45   unsigned Mips16SPAliasReg;
46 
47   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
48   int VarArgsFrameIndex;
49 
50   // Formal argument information obtained during call to LowerFormalArguments.
51   unsigned NextStackOffset;
52   bool HasByvalArg;
53 
54   // Size of incoming argument area.
55   unsigned IncomingArgSize;
56 
57 public:
58   MipsFunctionInfo(MachineFunction& MF)
59    : MF(MF), SRetReturnReg(0), GlobalBaseReg(0), Mips16SPAliasReg(0),
60      VarArgsFrameIndex(0)
61   {}
62 
63   unsigned getSRetReturnReg() const { return SRetReturnReg; }
64   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
65 
66   bool globalBaseRegSet() const;
67   unsigned getGlobalBaseReg();
68 
69   bool mips16SPAliasRegSet() const;
70   unsigned getMips16SPAliasReg();
71 
72   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
73   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
74 
75   unsigned nextStackOffset() const { return NextStackOffset; }
76   bool hasByvalArg() const { return HasByvalArg; }
77   void setFormalArgInfo(unsigned Offset, bool HasByval) {
78     NextStackOffset = Offset;
79     HasByvalArg = HasByval;
80   }
81 
82   unsigned getIncomingArgSize() const { return IncomingArgSize; }
83   void setIncomingArgSize(unsigned S) { IncomingArgSize = S; }
84 };
85 
86 } // end of namespace llvm
87 
88 #endif // MIPS_MACHINE_FUNCTION_INFO_H
89