1 //=- RISCVMachineFunctionInfo.h - RISC-V machine function info ----*- C++ -*-=// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file declares RISCV-specific per-machine-function information. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_RISCV_RISCVMACHINEFUNCTIONINFO_H 14 #define LLVM_LIB_TARGET_RISCV_RISCVMACHINEFUNCTIONINFO_H 15 16 #include "RISCVSubtarget.h" 17 #include "llvm/CodeGen/MIRYamlMapping.h" 18 #include "llvm/CodeGen/MachineFrameInfo.h" 19 #include "llvm/CodeGen/MachineFunction.h" 20 21 namespace llvm { 22 23 class RISCVMachineFunctionInfo; 24 25 namespace yaml { 26 struct RISCVMachineFunctionInfo final : public yaml::MachineFunctionInfo { 27 int VarArgsFrameIndex; 28 int VarArgsSaveSize; 29 30 RISCVMachineFunctionInfo() = default; 31 RISCVMachineFunctionInfo(const llvm::RISCVMachineFunctionInfo &MFI); 32 33 void mappingImpl(yaml::IO &YamlIO) override; 34 ~RISCVMachineFunctionInfo() = default; 35 }; 36 37 template <> struct MappingTraits<RISCVMachineFunctionInfo> { 38 static void mapping(IO &YamlIO, RISCVMachineFunctionInfo &MFI) { 39 YamlIO.mapOptional("varArgsFrameIndex", MFI.VarArgsFrameIndex); 40 YamlIO.mapOptional("varArgsSaveSize", MFI.VarArgsSaveSize); 41 } 42 }; 43 } // end namespace yaml 44 45 /// RISCVMachineFunctionInfo - This class is derived from MachineFunctionInfo 46 /// and contains private RISCV-specific information for each MachineFunction. 47 class RISCVMachineFunctionInfo : public MachineFunctionInfo { 48 private: 49 /// FrameIndex for start of varargs area 50 int VarArgsFrameIndex = 0; 51 /// Size of the save area used for varargs 52 int VarArgsSaveSize = 0; 53 /// FrameIndex used for transferring values between 64-bit FPRs and a pair 54 /// of 32-bit GPRs via the stack. 55 int MoveF64FrameIndex = -1; 56 /// FrameIndex of the spill slot for the scratch register in BranchRelaxation. 57 int BranchRelaxationScratchFrameIndex = -1; 58 /// Size of any opaque stack adjustment due to save/restore libcalls. 59 unsigned LibCallStackSize = 0; 60 /// Size of RVV stack. 61 uint64_t RVVStackSize = 0; 62 /// Alignment of RVV stack. 63 Align RVVStackAlign; 64 /// Padding required to keep RVV stack aligned within the main stack. 65 uint64_t RVVPadding = 0; 66 /// Size of stack frame to save callee saved registers 67 unsigned CalleeSavedStackSize = 0; 68 /// Is there any vector argument or return? 69 bool IsVectorCall = false; 70 71 /// Registers that have been sign extended from i32. 72 SmallVector<Register, 8> SExt32Registers; 73 74 /// Size of stack frame for Zcmp PUSH/POP 75 unsigned RVPushStackSize = 0; 76 unsigned RVPushRegs = 0; 77 int RVPushRlist = llvm::RISCVZC::RLISTENCODE::INVALID_RLIST; 78 79 int64_t StackProbeSize = 0; 80 81 /// Does it probe the stack for a dynamic allocation? 82 bool HasDynamicAllocation = false; 83 84 public: 85 RISCVMachineFunctionInfo(const Function &F, const RISCVSubtarget *STI); 86 87 MachineFunctionInfo * 88 clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF, 89 const DenseMap<MachineBasicBlock *, MachineBasicBlock *> &Src2DstMBB) 90 const override; 91 92 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; } 93 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; } 94 95 unsigned getVarArgsSaveSize() const { return VarArgsSaveSize; } 96 void setVarArgsSaveSize(int Size) { VarArgsSaveSize = Size; } 97 98 int getMoveF64FrameIndex(MachineFunction &MF) { 99 if (MoveF64FrameIndex == -1) 100 MoveF64FrameIndex = 101 MF.getFrameInfo().CreateStackObject(8, Align(8), false); 102 return MoveF64FrameIndex; 103 } 104 105 int getBranchRelaxationScratchFrameIndex() const { 106 return BranchRelaxationScratchFrameIndex; 107 } 108 void setBranchRelaxationScratchFrameIndex(int Index) { 109 BranchRelaxationScratchFrameIndex = Index; 110 } 111 112 unsigned getReservedSpillsSize() const { 113 return LibCallStackSize + RVPushStackSize; 114 } 115 116 unsigned getLibCallStackSize() const { return LibCallStackSize; } 117 void setLibCallStackSize(unsigned Size) { LibCallStackSize = Size; } 118 119 bool useSaveRestoreLibCalls(const MachineFunction &MF) const { 120 // We cannot use fixed locations for the callee saved spill slots if the 121 // function uses a varargs save area, or is an interrupt handler. 122 return !isPushable(MF) && 123 MF.getSubtarget<RISCVSubtarget>().enableSaveRestore() && 124 VarArgsSaveSize == 0 && !MF.getFrameInfo().hasTailCall() && 125 !MF.getFunction().hasFnAttribute("interrupt"); 126 } 127 128 uint64_t getRVVStackSize() const { return RVVStackSize; } 129 void setRVVStackSize(uint64_t Size) { RVVStackSize = Size; } 130 131 Align getRVVStackAlign() const { return RVVStackAlign; } 132 void setRVVStackAlign(Align StackAlign) { RVVStackAlign = StackAlign; } 133 134 uint64_t getRVVPadding() const { return RVVPadding; } 135 void setRVVPadding(uint64_t Padding) { RVVPadding = Padding; } 136 137 unsigned getCalleeSavedStackSize() const { return CalleeSavedStackSize; } 138 void setCalleeSavedStackSize(unsigned Size) { CalleeSavedStackSize = Size; } 139 140 bool isPushable(const MachineFunction &MF) const { 141 // We cannot use fixed locations for the callee saved spill slots if the 142 // function uses a varargs save area. 143 // TODO: Use a separate placement for vararg registers to enable Zcmp. 144 return MF.getSubtarget<RISCVSubtarget>().hasStdExtZcmp() && 145 !MF.getTarget().Options.DisableFramePointerElim(MF) && 146 VarArgsSaveSize == 0; 147 } 148 149 int getRVPushRlist() const { return RVPushRlist; } 150 void setRVPushRlist(int Rlist) { RVPushRlist = Rlist; } 151 152 unsigned getRVPushRegs() const { return RVPushRegs; } 153 void setRVPushRegs(unsigned Regs) { RVPushRegs = Regs; } 154 155 unsigned getRVPushStackSize() const { return RVPushStackSize; } 156 void setRVPushStackSize(unsigned Size) { RVPushStackSize = Size; } 157 158 void initializeBaseYamlFields(const yaml::RISCVMachineFunctionInfo &YamlMFI); 159 160 void addSExt32Register(Register Reg); 161 bool isSExt32Register(Register Reg) const; 162 163 bool isVectorCall() const { return IsVectorCall; } 164 void setIsVectorCall() { IsVectorCall = true; } 165 166 bool hasDynamicAllocation() const { return HasDynamicAllocation; } 167 void setDynamicAllocation() { HasDynamicAllocation = true; } 168 }; 169 170 } // end namespace llvm 171 172 #endif // LLVM_LIB_TARGET_RISCV_RISCVMACHINEFUNCTIONINFO_H 173