1 //=- RISCVMachineFunctionInfo.h - RISCV 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   /// Size of any opaque stack adjustment due to save/restore libcalls.
57   unsigned LibCallStackSize = 0;
58   /// Size of RVV stack.
59   uint64_t RVVStackSize = 0;
60   /// Alignment of RVV stack.
61   Align RVVStackAlign;
62   /// Padding required to keep RVV stack aligned within the main stack.
63   uint64_t RVVPadding = 0;
64   /// Size of stack frame to save callee saved registers
65   unsigned CalleeSavedStackSize = 0;
66 
67 public:
68   RISCVMachineFunctionInfo(const MachineFunction &MF) {}
69 
70   MachineFunctionInfo *
71   clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF,
72         const DenseMap<MachineBasicBlock *, MachineBasicBlock *> &Src2DstMBB)
73       const override;
74 
75   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
76   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
77 
78   unsigned getVarArgsSaveSize() const { return VarArgsSaveSize; }
79   void setVarArgsSaveSize(int Size) { VarArgsSaveSize = Size; }
80 
81   int getMoveF64FrameIndex(MachineFunction &MF) {
82     if (MoveF64FrameIndex == -1)
83       MoveF64FrameIndex =
84           MF.getFrameInfo().CreateStackObject(8, Align(8), false);
85     return MoveF64FrameIndex;
86   }
87 
88   unsigned getLibCallStackSize() const { return LibCallStackSize; }
89   void setLibCallStackSize(unsigned Size) { LibCallStackSize = Size; }
90 
91   bool useSaveRestoreLibCalls(const MachineFunction &MF) const {
92     // We cannot use fixed locations for the callee saved spill slots if the
93     // function uses a varargs save area, or is an interrupt handler.
94     return MF.getSubtarget<RISCVSubtarget>().enableSaveRestore() &&
95            VarArgsSaveSize == 0 && !MF.getFrameInfo().hasTailCall() &&
96            !MF.getFunction().hasFnAttribute("interrupt");
97   }
98 
99   uint64_t getRVVStackSize() const { return RVVStackSize; }
100   void setRVVStackSize(uint64_t Size) { RVVStackSize = Size; }
101 
102   Align getRVVStackAlign() const { return RVVStackAlign; }
103   void setRVVStackAlign(Align StackAlign) { RVVStackAlign = StackAlign; }
104 
105   uint64_t getRVVPadding() const { return RVVPadding; }
106   void setRVVPadding(uint64_t Padding) { RVVPadding = Padding; }
107 
108   unsigned getCalleeSavedStackSize() const { return CalleeSavedStackSize; }
109   void setCalleeSavedStackSize(unsigned Size) { CalleeSavedStackSize = Size; }
110 
111   void initializeBaseYamlFields(const yaml::RISCVMachineFunctionInfo &YamlMFI);
112 };
113 
114 } // end namespace llvm
115 
116 #endif // LLVM_LIB_TARGET_RISCV_RISCVMACHINEFUNCTIONINFO_H
117