1 //===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- C++ -*-=//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the Mips specific subclass of MachineFunctionInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef MIPS_MACHINE_FUNCTION_INFO_H
15 #define MIPS_MACHINE_FUNCTION_INFO_H
17 #include "llvm/ADT/SmallVector.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
24 /// MipsFunctionInfo - This class is derived from MachineFunction private
25 /// Mips target-specific information for each MachineFunction.
26 class MipsFunctionInfo : public MachineFunctionInfo {
27 virtual void anchor();
30 /// SRetReturnReg - Some subtargets require that sret lowering includes
31 /// returning the value of the returned struct in a register. This field
32 /// holds the virtual register into which the sret argument is passed.
33 unsigned SRetReturnReg;
35 /// GlobalBaseReg - keeps track of the virtual register initialized for
36 /// use as the global base register. This is used for PIC in some PIC
37 /// relocation models.
38 unsigned GlobalBaseReg;
40 /// VarArgsFrameIndex - FrameIndex for start of varargs area.
41 int VarArgsFrameIndex;
43 // Range of frame object indices.
44 // InArgFIRange: Range of indices of all frame objects created during call to
45 // LowerFormalArguments.
46 // OutArgFIRange: Range of indices of all frame objects created during call to
47 // LowerCall except for the frame object for restoring $gp.
48 std::pair<int, int> InArgFIRange, OutArgFIRange;
49 int GPFI; // Index of the frame object for restoring $gp
50 mutable int DynAllocFI; // Frame index of dynamically allocated stack area.
51 unsigned MaxCallFrameSize;
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)), GPFI(0), DynAllocFI(0),
61 bool isInArgFI(int FI) const {
62 return FI <= InArgFIRange.first && FI >= InArgFIRange.second;
64 void setLastInArgFI(int FI) { InArgFIRange.second = FI; }
66 bool isOutArgFI(int FI) const {
67 return FI <= OutArgFIRange.first && FI >= OutArgFIRange.second;
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;
76 int getGPFI() const { return GPFI; }
77 void setGPFI(int FI) { GPFI = FI; }
78 bool needGPSaveRestore() const { return getGPFI(); }
79 bool isGPFI(int FI) const { return GPFI && GPFI == FI; }
81 // The first call to this function creates a frame object for dynamically
82 // allocated stack area.
83 int getDynAllocFI() const {
85 DynAllocFI = MF.getFrameInfo()->CreateFixedObject(4, 0, true);
89 bool isDynAllocFI(int FI) const { return DynAllocFI && DynAllocFI == FI; }
91 unsigned getSRetReturnReg() const { return SRetReturnReg; }
92 void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
94 bool globalBaseRegFixed() const;
95 bool globalBaseRegSet() const;
96 unsigned getGlobalBaseReg();
98 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
99 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
101 unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
102 void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
105 } // end of namespace llvm
107 #endif // MIPS_MACHINE_FUNCTION_INFO_H