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/MachineFrameInfo.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 
20 namespace llvm {
21 
22 /// RISCVMachineFunctionInfo - This class is derived from MachineFunctionInfo
23 /// and contains private RISCV-specific information for each MachineFunction.
24 class RISCVMachineFunctionInfo : public MachineFunctionInfo {
25 private:
26   /// FrameIndex for start of varargs area
27   int VarArgsFrameIndex = 0;
28   /// Size of the save area used for varargs
29   int VarArgsSaveSize = 0;
30   /// FrameIndex used for transferring values between 64-bit FPRs and a pair
31   /// of 32-bit GPRs via the stack.
32   int MoveF64FrameIndex = -1;
33   /// Size of any opaque stack adjustment due to save/restore libcalls.
34   unsigned LibCallStackSize = 0;
35   /// Size of RVV stack.
36   uint64_t RVVStackSize = 0;
37 
38 public:
39   RISCVMachineFunctionInfo(const MachineFunction &MF) {}
40 
41   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
42   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
43 
44   unsigned getVarArgsSaveSize() const { return VarArgsSaveSize; }
45   void setVarArgsSaveSize(int Size) { VarArgsSaveSize = Size; }
46 
47   int getMoveF64FrameIndex(MachineFunction &MF) {
48     if (MoveF64FrameIndex == -1)
49       MoveF64FrameIndex =
50           MF.getFrameInfo().CreateStackObject(8, Align(8), false);
51     return MoveF64FrameIndex;
52   }
53 
54   unsigned getLibCallStackSize() const { return LibCallStackSize; }
55   void setLibCallStackSize(unsigned Size) { LibCallStackSize = Size; }
56 
57   bool useSaveRestoreLibCalls(const MachineFunction &MF) const {
58     // We cannot use fixed locations for the callee saved spill slots if the
59     // function uses a varargs save area.
60     return MF.getSubtarget<RISCVSubtarget>().enableSaveRestore() &&
61            VarArgsSaveSize == 0 && !MF.getFrameInfo().hasTailCall();
62   }
63 
64   uint64_t getRVVStackSize() const { return RVVStackSize; }
65   void setRVVStackSize(uint64_t Size) { RVVStackSize = Size; }
66 };
67 
68 } // end namespace llvm
69 
70 #endif // LLVM_LIB_TARGET_RISCV_RISCVMACHINEFUNCTIONINFO_H
71