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/VectorExtras.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
23 /// MipsFunctionInfo - This class is derived from MachineFunction private
24 /// Mips target-specific information for each MachineFunction.
25 class MipsFunctionInfo : public MachineFunctionInfo {
28 /// Holds for each function where on the stack the Frame Pointer must be
32 /// Holds for each function where on the stack the Return Address must be
36 /// MipsFIHolder - Holds a FrameIndex and it's Stack Pointer Offset
42 MipsFIHolder(int FrameIndex, int StackPointerOffset)
43 : FI(FrameIndex), SPOffset(StackPointerOffset) {}
46 /// When PIC is used the GP must be saved on the stack on the function
47 /// prologue and must be reloaded from this stack location after every
48 /// call. A reference to its stack location and frame index must be kept
49 /// to be used on emitPrologue and processFunctionBeforeFrameFinalized.
50 MipsFIHolder GPHolder;
52 // On LowerFORMAL_ARGUMENTS the stack size is unknown, so the Stack
53 // Pointer Offset calculation of "not in register arguments" must be
54 // postponed to emitPrologue.
55 SmallVector<MipsFIHolder, 16> FnLoadArgs;
58 // When VarArgs, we must write registers back to caller stack, preserving
59 // on register arguments. Since the stack size is unknown on
60 // LowerFORMAL_ARGUMENTS, the Stack Pointer Offset calculation must be
61 // postponed to emitPrologue.
62 SmallVector<MipsFIHolder, 4> FnStoreVarArgs;
65 /// SRetReturnReg - Some subtargets require that sret lowering includes
66 /// returning the value of the returned struct in a register. This field
67 /// holds the virtual register into which the sret argument is passed.
68 unsigned SRetReturnReg;
71 MipsFunctionInfo(MachineFunction& MF)
72 : FPStackOffset(0), RAStackOffset(0), GPHolder(-1,-1), HasLoadArgs(false),
73 HasStoreVarArgs(false), SRetReturnReg(0)
76 int getFPStackOffset() const { return FPStackOffset; }
77 void setFPStackOffset(int Off) { FPStackOffset = Off; }
79 int getRAStackOffset() const { return RAStackOffset; }
80 void setRAStackOffset(int Off) { RAStackOffset = Off; }
82 int getGPStackOffset() const { return GPHolder.SPOffset; }
83 int getGPFI() const { return GPHolder.FI; }
84 void setGPStackOffset(int Off) { GPHolder.SPOffset = Off; }
85 void setGPFI(int FI) { GPHolder.FI = FI; }
87 int getTopSavedRegOffset() const {
88 return (RAStackOffset > FPStackOffset) ?
89 (RAStackOffset) : (FPStackOffset);
92 bool hasLoadArgs() const { return HasLoadArgs; }
93 bool hasStoreVarArgs() const { return HasStoreVarArgs; }
95 void recordLoadArgsFI(int FI, int SPOffset) {
96 if (!HasLoadArgs) HasLoadArgs=true;
97 FnLoadArgs.push_back(MipsFIHolder(FI, SPOffset));
99 void recordStoreVarArgsFI(int FI, int SPOffset) {
100 if (!HasStoreVarArgs) HasStoreVarArgs=true;
101 FnStoreVarArgs.push_back(MipsFIHolder(FI, SPOffset));
104 void adjustLoadArgsFI(MachineFrameInfo *MFI) const {
105 if (!hasLoadArgs()) return;
106 for (unsigned i = 0, e = FnLoadArgs.size(); i != e; ++i)
107 MFI->setObjectOffset( FnLoadArgs[i].FI, FnLoadArgs[i].SPOffset );
109 void adjustStoreVarArgsFI(MachineFrameInfo *MFI) const {
110 if (!hasStoreVarArgs()) return;
111 for (unsigned i = 0, e = FnStoreVarArgs.size(); i != e; ++i)
112 MFI->setObjectOffset( FnStoreVarArgs[i].FI, FnStoreVarArgs[i].SPOffset );
115 unsigned getSRetReturnReg() const { return SRetReturnReg; }
116 void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
119 } // end of namespace llvm
121 #endif // MIPS_MACHINE_FUNCTION_INFO_H