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 /// This function makes use of the PPC64 ELF TOC base pointer (register r2).
68 /// MinReservedArea - This is the frame size that is at least reserved in a
69 /// potential caller (parameter+linkage area).
70 unsigned MinReservedArea;
72 /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
73 /// amount the stack pointer is adjusted to make the frame bigger for tail
74 /// calls. Used for creating an area before the register spill area.
77 /// HasFastCall - Does this function contain a fast call. Used to determine
78 /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
81 /// VarArgsFrameIndex - FrameIndex for start of varargs area.
82 int VarArgsFrameIndex;
83 /// VarArgsStackOffset - StackOffset for start of stack
85 int VarArgsStackOffset;
86 /// VarArgsNumGPR - Index of the first unused integer
87 /// register for parameter passing.
88 unsigned VarArgsNumGPR;
89 /// VarArgsNumFPR - Index of the first unused double
90 /// register for parameter passing.
91 unsigned VarArgsNumFPR;
93 /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
94 int CRSpillFrameIndex;
96 /// If any of CR[2-4] need to be saved in the prologue and restored in the
97 /// epilogue then they are added to this array. This is used for the
99 SmallVector<unsigned, 3> MustSaveCRs;
101 /// Hold onto our MachineFunction context.
104 /// Whether this uses the PIC Base register or not.
108 explicit PPCFunctionInfo(MachineFunction &MF)
109 : FramePointerSaveIndex(0),
110 ReturnAddrSaveIndex(0),
111 BasePointerSaveIndex(0),
112 PICBasePointerSaveIndex(0),
114 HasNonRISpills(false),
117 LRStoreRequired(false),
118 UsesTOCBasePtr(false),
122 VarArgsFrameIndex(0),
123 VarArgsStackOffset(0),
126 CRSpillFrameIndex(0),
130 int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
131 void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
133 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
134 void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
136 int getBasePointerSaveIndex() const { return BasePointerSaveIndex; }
137 void setBasePointerSaveIndex(int Idx) { BasePointerSaveIndex = Idx; }
139 int getPICBasePointerSaveIndex() const { return PICBasePointerSaveIndex; }
140 void setPICBasePointerSaveIndex(int Idx) { PICBasePointerSaveIndex = Idx; }
142 unsigned getMinReservedArea() const { return MinReservedArea; }
143 void setMinReservedArea(unsigned size) { MinReservedArea = size; }
145 int getTailCallSPDelta() const { return TailCallSPDelta; }
146 void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
148 /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
149 /// scan of the function. It is true if the LR/LR8 register is ever explicitly
150 /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
151 /// which is used in PIC generation), or if the LR stack slot is explicitly
152 /// referenced by builtin_return_address.
153 void setMustSaveLR(bool U) { MustSaveLR = U; }
154 bool mustSaveLR() const { return MustSaveLR; }
156 void setHasSpills() { HasSpills = true; }
157 bool hasSpills() const { return HasSpills; }
159 void setHasNonRISpills() { HasNonRISpills = true; }
160 bool hasNonRISpills() const { return HasNonRISpills; }
162 void setSpillsCR() { SpillsCR = true; }
163 bool isCRSpilled() const { return SpillsCR; }
165 void setSpillsVRSAVE() { SpillsVRSAVE = true; }
166 bool isVRSAVESpilled() const { return SpillsVRSAVE; }
168 void setLRStoreRequired() { LRStoreRequired = true; }
169 bool isLRStoreRequired() const { return LRStoreRequired; }
171 void setUsesTOCBasePtr() { UsesTOCBasePtr = true; }
172 bool usesTOCBasePtr() const { return UsesTOCBasePtr; }
174 void setHasFastCall() { HasFastCall = true; }
175 bool hasFastCall() const { return HasFastCall;}
177 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
178 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
180 int getVarArgsStackOffset() const { return VarArgsStackOffset; }
181 void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
183 unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
184 void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
186 unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
187 void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
189 int getCRSpillFrameIndex() const { return CRSpillFrameIndex; }
190 void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; }
192 const SmallVectorImpl<unsigned> &
193 getMustSaveCRs() const { return MustSaveCRs; }
194 void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); }
196 void setUsesPICBase(bool uses) { UsesPICBase = uses; }
197 bool usesPICBase() const { return UsesPICBase; }
199 MCSymbol *getPICOffsetSymbol() const;
202 } // end of namespace llvm