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
21namespace llvm {
22
23class RISCVMachineFunctionInfo;
24
25namespace yaml {
26struct 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
37template <> struct MappingTraits<RISCVMachineFunctionInfo> {
38 static void mapping(IO &YamlIO, RISCVMachineFunctionInfo &MFI) {
39 YamlIO.mapOptional(Key: "varArgsFrameIndex", Val&: MFI.VarArgsFrameIndex);
40 YamlIO.mapOptional(Key: "varArgsSaveSize", Val&: 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.
47class RISCVMachineFunctionInfo : public MachineFunctionInfo {
48private:
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
79public:
80 RISCVMachineFunctionInfo(const Function &F, const TargetSubtargetInfo *STI) {}
81
82 MachineFunctionInfo *
83 clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF,
84 const DenseMap<MachineBasicBlock *, MachineBasicBlock *> &Src2DstMBB)
85 const override;
86
87 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
88 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
89
90 unsigned getVarArgsSaveSize() const { return VarArgsSaveSize; }
91 void setVarArgsSaveSize(int Size) { VarArgsSaveSize = Size; }
92
93 int getMoveF64FrameIndex(MachineFunction &MF) {
94 if (MoveF64FrameIndex == -1)
95 MoveF64FrameIndex =
96 MF.getFrameInfo().CreateStackObject(Size: 8, Alignment: Align(8), isSpillSlot: false);
97 return MoveF64FrameIndex;
98 }
99
100 int getBranchRelaxationScratchFrameIndex() const {
101 return BranchRelaxationScratchFrameIndex;
102 }
103 void setBranchRelaxationScratchFrameIndex(int Index) {
104 BranchRelaxationScratchFrameIndex = Index;
105 }
106
107 unsigned getReservedSpillsSize() const {
108 return LibCallStackSize + RVPushStackSize;
109 }
110
111 unsigned getLibCallStackSize() const { return LibCallStackSize; }
112 void setLibCallStackSize(unsigned Size) { LibCallStackSize = Size; }
113
114 bool useSaveRestoreLibCalls(const MachineFunction &MF) const {
115 // We cannot use fixed locations for the callee saved spill slots if the
116 // function uses a varargs save area, or is an interrupt handler.
117 return !isPushable(MF) &&
118 MF.getSubtarget<RISCVSubtarget>().enableSaveRestore() &&
119 VarArgsSaveSize == 0 && !MF.getFrameInfo().hasTailCall() &&
120 !MF.getFunction().hasFnAttribute(Kind: "interrupt");
121 }
122
123 uint64_t getRVVStackSize() const { return RVVStackSize; }
124 void setRVVStackSize(uint64_t Size) { RVVStackSize = Size; }
125
126 Align getRVVStackAlign() const { return RVVStackAlign; }
127 void setRVVStackAlign(Align StackAlign) { RVVStackAlign = StackAlign; }
128
129 uint64_t getRVVPadding() const { return RVVPadding; }
130 void setRVVPadding(uint64_t Padding) { RVVPadding = Padding; }
131
132 unsigned getCalleeSavedStackSize() const { return CalleeSavedStackSize; }
133 void setCalleeSavedStackSize(unsigned Size) { CalleeSavedStackSize = Size; }
134
135 bool isPushable(const MachineFunction &MF) const {
136 // We cannot use fixed locations for the callee saved spill slots if the
137 // function uses a varargs save area.
138 // TODO: Use a seperate placement for vararg registers to enable Zcmp.
139 return MF.getSubtarget<RISCVSubtarget>().hasStdExtZcmp() &&
140 !MF.getTarget().Options.DisableFramePointerElim(MF) &&
141 VarArgsSaveSize == 0;
142 }
143
144 int getRVPushRlist() const { return RVPushRlist; }
145 void setRVPushRlist(int Rlist) { RVPushRlist = Rlist; }
146
147 unsigned getRVPushRegs() const { return RVPushRegs; }
148 void setRVPushRegs(unsigned Regs) { RVPushRegs = Regs; }
149
150 unsigned getRVPushStackSize() const { return RVPushStackSize; }
151 void setRVPushStackSize(unsigned Size) { RVPushStackSize = Size; }
152
153 void initializeBaseYamlFields(const yaml::RISCVMachineFunctionInfo &YamlMFI);
154
155 void addSExt32Register(Register Reg);
156 bool isSExt32Register(Register Reg) const;
157
158 bool isVectorCall() const { return IsVectorCall; }
159 void setIsVectorCall() { IsVectorCall = true; }
160};
161
162} // end namespace llvm
163
164#endif // LLVM_LIB_TARGET_RISCV_RISCVMACHINEFUNCTIONINFO_H
165

source code of llvm/lib/Target/RISCV/RISCVMachineFunctionInfo.h