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1 //===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- 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 PowerPC specific subclass of MachineFunctionInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H
15 #define LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H
17 #include "llvm/CodeGen/MachineFunction.h"
21 /// PPCFunctionInfo - This class is derived from MachineFunction private
22 /// PowerPC target-specific information for each MachineFunction.
23 class PPCFunctionInfo
: public MachineFunctionInfo
{
24 virtual void anchor();
26 /// FramePointerSaveIndex - Frame index of where the old frame pointer is
27 /// stored. Also used as an anchor for instructions that need to be altered
28 /// when using frame pointers (dyna_add, dyna_sub.)
29 int FramePointerSaveIndex
;
31 /// ReturnAddrSaveIndex - Frame index of where the return address is stored.
33 int ReturnAddrSaveIndex
;
35 /// Frame index where the old base pointer is stored.
36 int BasePointerSaveIndex
;
38 /// Frame index where the old PIC base pointer is stored.
39 int PICBasePointerSaveIndex
;
41 /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
42 /// function. This is only valid after the initial scan of the function by
46 /// Does this function have any stack spills.
49 /// Does this function spill using instructions with only r+r (not r+i)
53 /// SpillsCR - Indicates whether CR is spilled in the current function.
56 /// Indicates whether VRSAVE is spilled in the current function.
59 /// LRStoreRequired - The bool indicates whether there is some explicit use of
60 /// the LR/LR8 stack slot that is not obvious from scanning the code. This
61 /// requires that the code generator produce a store of LR to the stack on
62 /// entry, even though LR may otherwise apparently not be used.
65 /// MinReservedArea - This is the frame size that is at least reserved in a
66 /// potential caller (parameter+linkage area).
67 unsigned MinReservedArea
;
69 /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
70 /// amount the stack pointer is adjusted to make the frame bigger for tail
71 /// calls. Used for creating an area before the register spill area.
74 /// HasFastCall - Does this function contain a fast call. Used to determine
75 /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
78 /// VarArgsFrameIndex - FrameIndex for start of varargs area.
79 int VarArgsFrameIndex
;
80 /// VarArgsStackOffset - StackOffset for start of stack
82 int VarArgsStackOffset
;
83 /// VarArgsNumGPR - Index of the first unused integer
84 /// register for parameter passing.
85 unsigned VarArgsNumGPR
;
86 /// VarArgsNumFPR - Index of the first unused double
87 /// register for parameter passing.
88 unsigned VarArgsNumFPR
;
90 /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
91 int CRSpillFrameIndex
;
93 /// If any of CR[2-4] need to be saved in the prologue and restored in the
94 /// epilogue then they are added to this array. This is used for the
96 SmallVector
<unsigned, 3> MustSaveCRs
;
98 /// Hold onto our MachineFunction context.
101 /// Whether this uses the PIC Base register or not.
105 explicit PPCFunctionInfo(MachineFunction
&MF
)
106 : FramePointerSaveIndex(0),
107 ReturnAddrSaveIndex(0),
108 BasePointerSaveIndex(0),
109 PICBasePointerSaveIndex(0),
111 HasNonRISpills(false),
114 LRStoreRequired(false),
118 VarArgsFrameIndex(0),
119 VarArgsStackOffset(0),
122 CRSpillFrameIndex(0),
126 int getFramePointerSaveIndex() const { return FramePointerSaveIndex
; }
127 void setFramePointerSaveIndex(int Idx
) { FramePointerSaveIndex
= Idx
; }
129 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex
; }
130 void setReturnAddrSaveIndex(int idx
) { ReturnAddrSaveIndex
= idx
; }
132 int getBasePointerSaveIndex() const { return BasePointerSaveIndex
; }
133 void setBasePointerSaveIndex(int Idx
) { BasePointerSaveIndex
= Idx
; }
135 int getPICBasePointerSaveIndex() const { return PICBasePointerSaveIndex
; }
136 void setPICBasePointerSaveIndex(int Idx
) { PICBasePointerSaveIndex
= Idx
; }
138 unsigned getMinReservedArea() const { return MinReservedArea
; }
139 void setMinReservedArea(unsigned size
) { MinReservedArea
= size
; }
141 int getTailCallSPDelta() const { return TailCallSPDelta
; }
142 void setTailCallSPDelta(int size
) { TailCallSPDelta
= size
; }
144 /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
145 /// scan of the function. It is true if the LR/LR8 register is ever explicitly
146 /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
147 /// which is used in PIC generation), or if the LR stack slot is explicitly
148 /// referenced by builtin_return_address.
149 void setMustSaveLR(bool U
) { MustSaveLR
= U
; }
150 bool mustSaveLR() const { return MustSaveLR
; }
152 void setHasSpills() { HasSpills
= true; }
153 bool hasSpills() const { return HasSpills
; }
155 void setHasNonRISpills() { HasNonRISpills
= true; }
156 bool hasNonRISpills() const { return HasNonRISpills
; }
158 void setSpillsCR() { SpillsCR
= true; }
159 bool isCRSpilled() const { return SpillsCR
; }
161 void setSpillsVRSAVE() { SpillsVRSAVE
= true; }
162 bool isVRSAVESpilled() const { return SpillsVRSAVE
; }
164 void setLRStoreRequired() { LRStoreRequired
= true; }
165 bool isLRStoreRequired() const { return LRStoreRequired
; }
167 void setHasFastCall() { HasFastCall
= true; }
168 bool hasFastCall() const { return HasFastCall
;}
170 int getVarArgsFrameIndex() const { return VarArgsFrameIndex
; }
171 void setVarArgsFrameIndex(int Index
) { VarArgsFrameIndex
= Index
; }
173 int getVarArgsStackOffset() const { return VarArgsStackOffset
; }
174 void setVarArgsStackOffset(int Offset
) { VarArgsStackOffset
= Offset
; }
176 unsigned getVarArgsNumGPR() const { return VarArgsNumGPR
; }
177 void setVarArgsNumGPR(unsigned Num
) { VarArgsNumGPR
= Num
; }
179 unsigned getVarArgsNumFPR() const { return VarArgsNumFPR
; }
180 void setVarArgsNumFPR(unsigned Num
) { VarArgsNumFPR
= Num
; }
182 int getCRSpillFrameIndex() const { return CRSpillFrameIndex
; }
183 void setCRSpillFrameIndex(int idx
) { CRSpillFrameIndex
= idx
; }
185 const SmallVectorImpl
<unsigned> &
186 getMustSaveCRs() const { return MustSaveCRs
; }
187 void addMustSaveCR(unsigned Reg
) { MustSaveCRs
.push_back(Reg
); }
189 void setUsesPICBase(bool uses
) { UsesPICBase
= uses
; }
190 bool usesPICBase() const { return UsesPICBase
; }
192 MCSymbol
*getPICOffsetSymbol() const;
195 } // end of namespace llvm