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 private: 25 /// FramePointerSaveIndex - Frame index of where the old frame pointer is 26 /// stored. Also used as an anchor for instructions that need to be altered 27 /// when using frame pointers (dyna_add, dyna_sub.) 28 int FramePointerSaveIndex; 29 30 /// ReturnAddrSaveIndex - Frame index of where the return address is stored. 31 /// 32 int ReturnAddrSaveIndex; 33 34 /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current 35 /// function. This is only valid after the initial scan of the function by 36 /// PEI. 37 bool MustSaveLR; 38 39 /// SpillsCR - Indicates whether CR is spilled in the current function. 40 bool SpillsCR; 41 42 /// LRStoreRequired - The bool indicates whether there is some explicit use of 43 /// the LR/LR8 stack slot that is not obvious from scanning the code. This 44 /// requires that the code generator produce a store of LR to the stack on 45 /// entry, even though LR may otherwise apparently not be used. 46 bool LRStoreRequired; 47 48 /// MinReservedArea - This is the frame size that is at least reserved in a 49 /// potential caller (parameter+linkage area). 50 unsigned MinReservedArea; 51 52 /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum 53 /// amount the stack pointer is adjusted to make the frame bigger for tail 54 /// calls. Used for creating an area before the register spill area. 55 int TailCallSPDelta; 56 57 /// HasFastCall - Does this function contain a fast call. Used to determine 58 /// how the caller's stack pointer should be calculated (epilog/dynamicalloc). 59 bool HasFastCall; 60 61 /// VarArgsFrameIndex - FrameIndex for start of varargs area. 62 int VarArgsFrameIndex; 63 /// VarArgsStackOffset - StackOffset for start of stack 64 /// arguments. 65 int VarArgsStackOffset; 66 /// VarArgsNumGPR - Index of the first unused integer 67 /// register for parameter passing. 68 unsigned VarArgsNumGPR; 69 /// VarArgsNumFPR - Index of the first unused double 70 /// register for parameter passing. 71 unsigned VarArgsNumFPR; 72 73 public: PPCFunctionInfo(MachineFunction & MF)74 explicit PPCFunctionInfo(MachineFunction &MF) 75 : FramePointerSaveIndex(0), 76 ReturnAddrSaveIndex(0), 77 SpillsCR(false), 78 LRStoreRequired(false), 79 MinReservedArea(0), 80 TailCallSPDelta(0), 81 HasFastCall(false), 82 VarArgsFrameIndex(0), 83 VarArgsStackOffset(0), 84 VarArgsNumGPR(0), 85 VarArgsNumFPR(0) {} 86 getFramePointerSaveIndex()87 int getFramePointerSaveIndex() const { return FramePointerSaveIndex; } setFramePointerSaveIndex(int Idx)88 void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; } 89 getReturnAddrSaveIndex()90 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; } setReturnAddrSaveIndex(int idx)91 void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; } 92 getMinReservedArea()93 unsigned getMinReservedArea() const { return MinReservedArea; } setMinReservedArea(unsigned size)94 void setMinReservedArea(unsigned size) { MinReservedArea = size; } 95 getTailCallSPDelta()96 int getTailCallSPDelta() const { return TailCallSPDelta; } setTailCallSPDelta(int size)97 void setTailCallSPDelta(int size) { TailCallSPDelta = size; } 98 99 /// MustSaveLR - This is set when the prolog/epilog inserter does its initial 100 /// scan of the function. It is true if the LR/LR8 register is ever explicitly 101 /// defined/clobbered in the machine function (e.g. by calls and movpctolr, 102 /// which is used in PIC generation), or if the LR stack slot is explicitly 103 /// referenced by builtin_return_address. setMustSaveLR(bool U)104 void setMustSaveLR(bool U) { MustSaveLR = U; } mustSaveLR()105 bool mustSaveLR() const { return MustSaveLR; } 106 setSpillsCR()107 void setSpillsCR() { SpillsCR = true; } isCRSpilled()108 bool isCRSpilled() const { return SpillsCR; } 109 setLRStoreRequired()110 void setLRStoreRequired() { LRStoreRequired = true; } isLRStoreRequired()111 bool isLRStoreRequired() const { return LRStoreRequired; } 112 setHasFastCall()113 void setHasFastCall() { HasFastCall = true; } hasFastCall()114 bool hasFastCall() const { return HasFastCall;} 115 getVarArgsFrameIndex()116 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; } setVarArgsFrameIndex(int Index)117 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; } 118 getVarArgsStackOffset()119 int getVarArgsStackOffset() const { return VarArgsStackOffset; } setVarArgsStackOffset(int Offset)120 void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; } 121 getVarArgsNumGPR()122 unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; } setVarArgsNumGPR(unsigned Num)123 void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; } 124 getVarArgsNumFPR()125 unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; } setVarArgsNumFPR(unsigned Num)126 void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; } 127 }; 128 129 } // end of namespace llvm 130 131 132 #endif 133