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 PPC_MACHINE_FUNCTION_INFO_H
15 #define PPC_MACHINE_FUNCTION_INFO_H
16 
17 #include "llvm/CodeGen/MachineFunction.h"
18 
19 namespace llvm {
20 
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();
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   /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
39   /// function.  This is only valid after the initial scan of the function by
40   /// PEI.
41   bool MustSaveLR;
42 
43   /// Does this function have any stack spills.
44   bool HasSpills;
45 
46   /// Does this function spill using instructions with only r+r (not r+i)
47   /// forms.
48   bool HasNonRISpills;
49 
50   /// SpillsCR - Indicates whether CR is spilled in the current function.
51   bool SpillsCR;
52 
53   /// Indicates whether VRSAVE is spilled in the current function.
54   bool SpillsVRSAVE;
55 
56   /// LRStoreRequired - The bool indicates whether there is some explicit use of
57   /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
58   /// requires that the code generator produce a store of LR to the stack on
59   /// entry, even though LR may otherwise apparently not be used.
60   bool LRStoreRequired;
61 
62   /// MinReservedArea - This is the frame size that is at least reserved in a
63   /// potential caller (parameter+linkage area).
64   unsigned MinReservedArea;
65 
66   /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
67   /// amount the stack pointer is adjusted to make the frame bigger for tail
68   /// calls. Used for creating an area before the register spill area.
69   int TailCallSPDelta;
70 
71   /// HasFastCall - Does this function contain a fast call. Used to determine
72   /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
73   bool HasFastCall;
74 
75   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
76   int VarArgsFrameIndex;
77   /// VarArgsStackOffset - StackOffset for start of stack
78   /// arguments.
79   int VarArgsStackOffset;
80   /// VarArgsNumGPR - Index of the first unused integer
81   /// register for parameter passing.
82   unsigned VarArgsNumGPR;
83   /// VarArgsNumFPR - Index of the first unused double
84   /// register for parameter passing.
85   unsigned VarArgsNumFPR;
86 
87   /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
88   int CRSpillFrameIndex;
89 
90   /// If any of CR[2-4] need to be saved in the prologue and restored in the
91   /// epilogue then they are added to this array. This is used for the
92   /// 64-bit SVR4 ABI.
93   SmallVector<unsigned, 3> MustSaveCRs;
94 
95 public:
96   explicit PPCFunctionInfo(MachineFunction &MF)
97     : FramePointerSaveIndex(0),
98       ReturnAddrSaveIndex(0),
99       BasePointerSaveIndex(0),
100       HasSpills(false),
101       HasNonRISpills(false),
102       SpillsCR(false),
103       SpillsVRSAVE(false),
104       LRStoreRequired(false),
105       MinReservedArea(0),
106       TailCallSPDelta(0),
107       HasFastCall(false),
108       VarArgsFrameIndex(0),
109       VarArgsStackOffset(0),
110       VarArgsNumGPR(0),
111       VarArgsNumFPR(0),
112       CRSpillFrameIndex(0) {}
113 
114   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
115   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
116 
117   int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
118   void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
119 
120   int getBasePointerSaveIndex() const { return BasePointerSaveIndex; }
121   void setBasePointerSaveIndex(int Idx) { BasePointerSaveIndex = Idx; }
122 
123   unsigned getMinReservedArea() const { return MinReservedArea; }
124   void setMinReservedArea(unsigned size) { MinReservedArea = size; }
125 
126   int getTailCallSPDelta() const { return TailCallSPDelta; }
127   void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
128 
129   /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
130   /// scan of the function. It is true if the LR/LR8 register is ever explicitly
131   /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
132   /// which is used in PIC generation), or if the LR stack slot is explicitly
133   /// referenced by builtin_return_address.
134   void setMustSaveLR(bool U) { MustSaveLR = U; }
135   bool mustSaveLR() const    { return MustSaveLR; }
136 
137   void setHasSpills()      { HasSpills = true; }
138   bool hasSpills() const   { return HasSpills; }
139 
140   void setHasNonRISpills()    { HasNonRISpills = true; }
141   bool hasNonRISpills() const { return HasNonRISpills; }
142 
143   void setSpillsCR()       { SpillsCR = true; }
144   bool isCRSpilled() const { return SpillsCR; }
145 
146   void setSpillsVRSAVE()       { SpillsVRSAVE = true; }
147   bool isVRSAVESpilled() const { return SpillsVRSAVE; }
148 
149   void setLRStoreRequired() { LRStoreRequired = true; }
150   bool isLRStoreRequired() const { return LRStoreRequired; }
151 
152   void setHasFastCall() { HasFastCall = true; }
153   bool hasFastCall() const { return HasFastCall;}
154 
155   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
156   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
157 
158   int getVarArgsStackOffset() const { return VarArgsStackOffset; }
159   void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
160 
161   unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
162   void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
163 
164   unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
165   void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
166 
167   int getCRSpillFrameIndex() const { return CRSpillFrameIndex; }
168   void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; }
169 
170   const SmallVectorImpl<unsigned> &
171     getMustSaveCRs() const { return MustSaveCRs; }
172   void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); }
173 };
174 
175 } // end of namespace llvm
176 
177 
178 #endif
179