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 "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"
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();
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;
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;
42 /// VarArgsFrameIndex - FrameIndex for start of varargs area.
43 int VarArgsFrameIndex;
45 // Range of frame object indices.
46 // InArgFIRange: Range of indices of all frame objects created during call to
47 // LowerFormalArguments.
48 // OutArgFIRange: Range of indices of all frame objects created during call to
49 // LowerCall except for the frame object for restoring $gp.
50 std::pair<int, int> InArgFIRange, OutArgFIRange;
52 mutable int DynAllocFI; // Frame index of dynamically allocated stack area.
53 unsigned MaxCallFrameSize;
58 MipsFunctionInfo(MachineFunction& MF)
59 : MF(MF), SRetReturnReg(0), GlobalBaseReg(0),
60 VarArgsFrameIndex(0), InArgFIRange(std::make_pair(-1, 0)),
61 OutArgFIRange(std::make_pair(-1, 0)), GlobalRegFI(0), DynAllocFI(0),
62 MaxCallFrameSize(0), EmitNOAT(false)
65 bool isInArgFI(int FI) const {
66 return FI <= InArgFIRange.first && FI >= InArgFIRange.second;
68 void setLastInArgFI(int FI) { InArgFIRange.second = FI; }
70 bool isOutArgFI(int FI) const {
71 return FI <= OutArgFIRange.first && FI >= OutArgFIRange.second;
73 void extendOutArgFIRange(int FirstFI, int LastFI) {
74 if (!OutArgFIRange.second)
75 // this must be the first time this function was called.
76 OutArgFIRange.first = FirstFI;
77 OutArgFIRange.second = LastFI;
80 bool isGlobalRegFI(int FI) const {
81 return GlobalRegFI && (FI == GlobalRegFI);
84 int getGlobalRegFI() const {
88 int initGlobalRegFI() {
89 const TargetMachine &TM = MF.getTarget();
90 unsigned RegSize = TM.getSubtarget<MipsSubtarget>().isABI_N64() ? 8 : 4;
91 int64_t StackAlignment = TM.getFrameLowering()->getStackAlignment();
92 uint64_t Offset = RoundUpToAlignment(MaxCallFrameSize, StackAlignment);
94 GlobalRegFI = MF.getFrameInfo()->CreateFixedObject(RegSize, Offset, true);
98 // The first call to this function creates a frame object for dynamically
99 // allocated stack area.
100 int getDynAllocFI() const {
102 DynAllocFI = MF.getFrameInfo()->CreateFixedObject(4, 0, true);
106 bool isDynAllocFI(int FI) const { return DynAllocFI && DynAllocFI == FI; }
108 unsigned getSRetReturnReg() const { return SRetReturnReg; }
109 void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
111 bool globalBaseRegSet() const;
112 unsigned getGlobalBaseReg();
114 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
115 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
117 unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
118 void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
120 bool getEmitNOAT() const { return EmitNOAT; }
121 void setEmitNOAT() { EmitNOAT = true; }
124 } // end of namespace llvm
126 #endif // MIPS_MACHINE_FUNCTION_INFO_H