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 PPC_MACHINE_FUNCTION_INFO_H
15 #define PPC_MACHINE_FUNCTION_INFO_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 /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
36 /// function. This is only valid after the initial scan of the function by
40 /// Does this function have any stack spills.
43 /// Does this function spill using instructions with only r+r (not r+i)
47 /// SpillsCR - Indicates whether CR is spilled in the current function.
50 /// Indicates whether VRSAVE is spilled in the current function.
53 /// LRStoreRequired - The bool indicates whether there is some explicit use of
54 /// the LR/LR8 stack slot that is not obvious from scanning the code. This
55 /// requires that the code generator produce a store of LR to the stack on
56 /// entry, even though LR may otherwise apparently not be used.
59 /// MinReservedArea - This is the frame size that is at least reserved in a
60 /// potential caller (parameter+linkage area).
61 unsigned MinReservedArea;
63 /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
64 /// amount the stack pointer is adjusted to make the frame bigger for tail
65 /// calls. Used for creating an area before the register spill area.
68 /// HasFastCall - Does this function contain a fast call. Used to determine
69 /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
72 /// VarArgsFrameIndex - FrameIndex for start of varargs area.
73 int VarArgsFrameIndex;
74 /// VarArgsStackOffset - StackOffset for start of stack
76 int VarArgsStackOffset;
77 /// VarArgsNumGPR - Index of the first unused integer
78 /// register for parameter passing.
79 unsigned VarArgsNumGPR;
80 /// VarArgsNumFPR - Index of the first unused double
81 /// register for parameter passing.
82 unsigned VarArgsNumFPR;
84 /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
85 int CRSpillFrameIndex;
87 /// If any of CR[2-4] need to be saved in the prologue and restored in the
88 /// epilogue then they are added to this array. This is used for the
90 SmallVector<unsigned, 3> MustSaveCRs;
93 explicit PPCFunctionInfo(MachineFunction &MF)
94 : FramePointerSaveIndex(0),
95 ReturnAddrSaveIndex(0),
97 HasNonRISpills(false),
100 LRStoreRequired(false),
104 VarArgsFrameIndex(0),
105 VarArgsStackOffset(0),
108 CRSpillFrameIndex(0) {}
110 int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
111 void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
113 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
114 void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
116 unsigned getMinReservedArea() const { return MinReservedArea; }
117 void setMinReservedArea(unsigned size) { MinReservedArea = size; }
119 int getTailCallSPDelta() const { return TailCallSPDelta; }
120 void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
122 /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
123 /// scan of the function. It is true if the LR/LR8 register is ever explicitly
124 /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
125 /// which is used in PIC generation), or if the LR stack slot is explicitly
126 /// referenced by builtin_return_address.
127 void setMustSaveLR(bool U) { MustSaveLR = U; }
128 bool mustSaveLR() const { return MustSaveLR; }
130 void setHasSpills() { HasSpills = true; }
131 bool hasSpills() const { return HasSpills; }
133 void setHasNonRISpills() { HasNonRISpills = true; }
134 bool hasNonRISpills() const { return HasNonRISpills; }
136 void setSpillsCR() { SpillsCR = true; }
137 bool isCRSpilled() const { return SpillsCR; }
139 void setSpillsVRSAVE() { SpillsVRSAVE = true; }
140 bool isVRSAVESpilled() const { return SpillsVRSAVE; }
142 void setLRStoreRequired() { LRStoreRequired = true; }
143 bool isLRStoreRequired() const { return LRStoreRequired; }
145 void setHasFastCall() { HasFastCall = true; }
146 bool hasFastCall() const { return HasFastCall;}
148 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
149 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
151 int getVarArgsStackOffset() const { return VarArgsStackOffset; }
152 void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
154 unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
155 void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
157 unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
158 void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
160 int getCRSpillFrameIndex() const { return CRSpillFrameIndex; }
161 void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; }
163 const SmallVector<unsigned, 3> &
164 getMustSaveCRs() const { return MustSaveCRs; }
165 void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); }
168 } // end of namespace llvm