LLVM  4.0.0
PPCMachineFunctionInfo.h
Go to the documentation of this file.
1 //===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- C++ -*-=//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file declares the PowerPC specific subclass of MachineFunctionInfo.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H
15 #define LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H
16 
18 
19 namespace llvm {
20 
21 /// PPCFunctionInfo - This class is derived from MachineFunction private
22 /// PowerPC target-specific information for each MachineFunction.
24  virtual void anchor();
25 
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;
30 
31  /// ReturnAddrSaveIndex - Frame index of where the return address is stored.
32  ///
33  int ReturnAddrSaveIndex;
34 
35  /// Frame index where the old base pointer is stored.
36  int BasePointerSaveIndex;
37 
38  /// Frame index where the old PIC base pointer is stored.
39  int PICBasePointerSaveIndex;
40 
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
43  /// PEI.
44  bool MustSaveLR;
45 
46  /// Does this function have any stack spills.
47  bool HasSpills;
48 
49  /// Does this function spill using instructions with only r+r (not r+i)
50  /// forms.
51  bool HasNonRISpills;
52 
53  /// SpillsCR - Indicates whether CR is spilled in the current function.
54  bool SpillsCR;
55 
56  /// Indicates whether VRSAVE is spilled in the current function.
57  bool SpillsVRSAVE;
58 
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.
63  bool LRStoreRequired;
64 
65  /// This function makes use of the PPC64 ELF TOC base pointer (register r2).
66  bool UsesTOCBasePtr;
67 
68  /// MinReservedArea - This is the frame size that is at least reserved in a
69  /// potential caller (parameter+linkage area).
70  unsigned MinReservedArea;
71 
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.
75  int TailCallSPDelta;
76 
77  /// HasFastCall - Does this function contain a fast call. Used to determine
78  /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
79  bool HasFastCall;
80 
81  /// VarArgsFrameIndex - FrameIndex for start of varargs area.
82  int VarArgsFrameIndex;
83  /// VarArgsStackOffset - StackOffset for start of stack
84  /// arguments.
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;
92 
93  /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
94  int CRSpillFrameIndex;
95 
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
98  /// 64-bit SVR4 ABI.
99  SmallVector<unsigned, 3> MustSaveCRs;
100 
101  /// Hold onto our MachineFunction context.
102  MachineFunction &MF;
103 
104  /// Whether this uses the PIC Base register or not.
105  bool UsesPICBase;
106 
107  /// True if this function has a subset of CSRs that is handled explicitly via
108  /// copies
109  bool IsSplitCSR;
110 
111 public:
113  : FramePointerSaveIndex(0),
114  ReturnAddrSaveIndex(0),
115  BasePointerSaveIndex(0),
116  PICBasePointerSaveIndex(0),
117  HasSpills(false),
118  HasNonRISpills(false),
119  SpillsCR(false),
120  SpillsVRSAVE(false),
121  LRStoreRequired(false),
122  UsesTOCBasePtr(false),
123  MinReservedArea(0),
124  TailCallSPDelta(0),
125  HasFastCall(false),
126  VarArgsFrameIndex(0),
127  VarArgsStackOffset(0),
128  VarArgsNumGPR(0),
129  VarArgsNumFPR(0),
130  CRSpillFrameIndex(0),
131  MF(MF),
132  UsesPICBase(0),
133  IsSplitCSR(false) {}
134 
135  int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
136  void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
137 
138  int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
139  void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
140 
141  int getBasePointerSaveIndex() const { return BasePointerSaveIndex; }
142  void setBasePointerSaveIndex(int Idx) { BasePointerSaveIndex = Idx; }
143 
144  int getPICBasePointerSaveIndex() const { return PICBasePointerSaveIndex; }
145  void setPICBasePointerSaveIndex(int Idx) { PICBasePointerSaveIndex = Idx; }
146 
147  unsigned getMinReservedArea() const { return MinReservedArea; }
148  void setMinReservedArea(unsigned size) { MinReservedArea = size; }
149 
150  int getTailCallSPDelta() const { return TailCallSPDelta; }
151  void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
152 
153  /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
154  /// scan of the function. It is true if the LR/LR8 register is ever explicitly
155  /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
156  /// which is used in PIC generation), or if the LR stack slot is explicitly
157  /// referenced by builtin_return_address.
158  void setMustSaveLR(bool U) { MustSaveLR = U; }
159  bool mustSaveLR() const { return MustSaveLR; }
160 
161  void setHasSpills() { HasSpills = true; }
162  bool hasSpills() const { return HasSpills; }
163 
164  void setHasNonRISpills() { HasNonRISpills = true; }
165  bool hasNonRISpills() const { return HasNonRISpills; }
166 
167  void setSpillsCR() { SpillsCR = true; }
168  bool isCRSpilled() const { return SpillsCR; }
169 
170  void setSpillsVRSAVE() { SpillsVRSAVE = true; }
171  bool isVRSAVESpilled() const { return SpillsVRSAVE; }
172 
173  void setLRStoreRequired() { LRStoreRequired = true; }
174  bool isLRStoreRequired() const { return LRStoreRequired; }
175 
176  void setUsesTOCBasePtr() { UsesTOCBasePtr = true; }
177  bool usesTOCBasePtr() const { return UsesTOCBasePtr; }
178 
179  void setHasFastCall() { HasFastCall = true; }
180  bool hasFastCall() const { return HasFastCall;}
181 
182  int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
183  void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
184 
185  int getVarArgsStackOffset() const { return VarArgsStackOffset; }
186  void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
187 
188  unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
189  void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
190 
191  unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
192  void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
193 
194  int getCRSpillFrameIndex() const { return CRSpillFrameIndex; }
195  void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; }
196 
198  getMustSaveCRs() const { return MustSaveCRs; }
199  void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); }
200 
201  void setUsesPICBase(bool uses) { UsesPICBase = uses; }
202  bool usesPICBase() const { return UsesPICBase; }
203 
204  bool isSplitCSR() const { return IsSplitCSR; }
205  void setIsSplitCSR(bool s) { IsSplitCSR = s; }
206 
207  MCSymbol *getPICOffsetSymbol() const;
208 
209  MCSymbol *getGlobalEPSymbol() const;
210  MCSymbol *getLocalEPSymbol() const;
211  MCSymbol *getTOCOffsetSymbol() const;
212 };
213 
214 } // end of namespace llvm
215 
216 
217 #endif
void push_back(const T &Elt)
Definition: SmallVector.h:211
void setVarArgsNumGPR(unsigned Num)
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:39
void addMustSaveCR(unsigned Reg)
void setFramePointerSaveIndex(int Idx)
unsigned getVarArgsNumGPR() const
MCSymbol * getGlobalEPSymbol() const
void setVarArgsNumFPR(unsigned Num)
MachineFunctionInfo - This class can be derived from and used by targets to hold private target-speci...
void setVarArgsStackOffset(int Offset)
PPCFunctionInfo - This class is derived from MachineFunction private PowerPC target-specific informat...
PPCFunctionInfo(MachineFunction &MF)
unsigned getMinReservedArea() const
Reg
All possible values of the reg field in the ModR/M byte.
MCSymbol * getTOCOffsetSymbol() const
Function Alias Analysis false
const SmallVectorImpl< unsigned > & getMustSaveCRs() const
unsigned getVarArgsNumFPR() const
uint32_t Offset
void setVarArgsFrameIndex(int Index)
void setMinReservedArea(unsigned size)
MCSymbol * getLocalEPSymbol() const
void setPICBasePointerSaveIndex(int Idx)
MCSymbol * getPICOffsetSymbol() const
void setMustSaveLR(bool U)
MustSaveLR - This is set when the prolog/epilog inserter does its initial scan of the function...