1 //===-- MBlazeMachineFunctionInfo.h - Private data ----------------*- 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 MBlaze specific subclass of MachineFunctionInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef MBLAZE_MACHINE_FUNCTION_INFO_H
15 #define MBLAZE_MACHINE_FUNCTION_INFO_H
17 #include "llvm/ADT/SmallVector.h"
18 #include "llvm/ADT/VectorExtras.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineFrameInfo.h"
24 /// MBlazeFunctionInfo - This class is derived from MachineFunction private
25 /// MBlaze target-specific information for each MachineFunction.
26 class MBlazeFunctionInfo : public MachineFunctionInfo {
29 /// Holds for each function where on the stack the Frame Pointer must be
30 /// saved. This is used on Prologue and Epilogue to emit FP save/restore
33 /// Holds for each function where on the stack the Return Address must be
34 /// saved. This is used on Prologue and Epilogue to emit RA save/restore
37 /// MBlazeFIHolder - Holds a FrameIndex and it's Stack Pointer Offset
38 struct MBlazeFIHolder {
43 MBlazeFIHolder(int FrameIndex, int StackPointerOffset)
44 : FI(FrameIndex), SPOffset(StackPointerOffset) {}
47 /// When PIC is used the GP must be saved on the stack on the function
48 /// prologue and must be reloaded from this stack location after every
49 /// call. A reference to its stack location and frame index must be kept
50 /// to be used on emitPrologue and processFunctionBeforeFrameFinalized.
51 MBlazeFIHolder GPHolder;
53 /// On LowerFormalArguments the stack size is unknown, so the Stack
54 /// Pointer Offset calculation of "not in register arguments" must be
55 /// postponed to emitPrologue.
56 SmallVector<MBlazeFIHolder, 16> FnLoadArgs;
59 // When VarArgs, we must write registers back to caller stack, preserving
60 // on register arguments. Since the stack size is unknown on
61 // LowerFormalArguments, the Stack Pointer Offset calculation must be
62 // postponed to emitPrologue.
63 SmallVector<MBlazeFIHolder, 4> FnStoreVarArgs;
66 /// SRetReturnReg - Some subtargets require that sret lowering includes
67 /// returning the value of the returned struct in a register. This field
68 /// holds the virtual register into which the sret argument is passed.
69 unsigned SRetReturnReg;
71 /// GlobalBaseReg - keeps track of the virtual register initialized for
72 /// use as the global base register. This is used for PIC in some PIC
73 /// relocation models.
74 unsigned GlobalBaseReg;
76 // VarArgsFrameIndex - FrameIndex for start of varargs area.
77 int VarArgsFrameIndex;
80 MBlazeFunctionInfo(MachineFunction& MF)
81 : FPStackOffset(0), RAStackOffset(0), GPHolder(-1,-1),
82 HasLoadArgs(false), HasStoreVarArgs(false), SRetReturnReg(0),
83 GlobalBaseReg(0), VarArgsFrameIndex(0)
86 int getFPStackOffset() const { return FPStackOffset; }
87 void setFPStackOffset(int Off) { FPStackOffset = Off; }
89 int getRAStackOffset() const { return RAStackOffset; }
90 void setRAStackOffset(int Off) { RAStackOffset = Off; }
92 int getGPStackOffset() const { return GPHolder.SPOffset; }
93 int getGPFI() const { return GPHolder.FI; }
94 void setGPStackOffset(int Off) { GPHolder.SPOffset = Off; }
95 void setGPFI(int FI) { GPHolder.FI = FI; }
96 bool needGPSaveRestore() const { return GPHolder.SPOffset != -1; }
98 bool hasLoadArgs() const { return HasLoadArgs; }
99 bool hasStoreVarArgs() const { return HasStoreVarArgs; }
101 void recordLoadArgsFI(int FI, int SPOffset) {
102 if (!HasLoadArgs) HasLoadArgs=true;
103 FnLoadArgs.push_back(MBlazeFIHolder(FI, SPOffset));
105 void recordStoreVarArgsFI(int FI, int SPOffset) {
106 if (!HasStoreVarArgs) HasStoreVarArgs=true;
107 FnStoreVarArgs.push_back(MBlazeFIHolder(FI, SPOffset));
110 void adjustLoadArgsFI(MachineFrameInfo *MFI) const {
111 if (!hasLoadArgs()) return;
112 for (unsigned i = 0, e = FnLoadArgs.size(); i != e; ++i)
113 MFI->setObjectOffset(FnLoadArgs[i].FI, FnLoadArgs[i].SPOffset);
115 void adjustStoreVarArgsFI(MachineFrameInfo *MFI) const {
116 if (!hasStoreVarArgs()) return;
117 for (unsigned i = 0, e = FnStoreVarArgs.size(); i != e; ++i)
118 MFI->setObjectOffset(FnStoreVarArgs[i].FI, FnStoreVarArgs[i].SPOffset);
121 unsigned getSRetReturnReg() const { return SRetReturnReg; }
122 void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
124 unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
125 void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
127 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
128 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
131 } // end of namespace llvm
133 #endif // MBLAZE_MACHINE_FUNCTION_INFO_H