1 | //===-- M68kSubtarget.h - Define Subtarget for the M68k ---------*- 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 | /// \file |
10 | /// This file declares the M68k specific subclass of TargetSubtargetInfo. |
11 | /// |
12 | //===----------------------------------------------------------------------===// |
13 | |
14 | #ifndef LLVM_LIB_TARGET_M68K_M68KSUBTARGET_H |
15 | #define LLVM_LIB_TARGET_M68K_M68KSUBTARGET_H |
16 | |
17 | #include "M68kFrameLowering.h" |
18 | #include "M68kISelLowering.h" |
19 | #include "M68kInstrInfo.h" |
20 | |
21 | #include "llvm/CodeGen/GlobalISel/CallLowering.h" |
22 | #include "llvm/CodeGen/GlobalISel/InstructionSelector.h" |
23 | #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h" |
24 | #include "llvm/CodeGen/RegisterBankInfo.h" |
25 | #include "llvm/CodeGen/SelectionDAGTargetInfo.h" |
26 | #include "llvm/CodeGen/TargetSubtargetInfo.h" |
27 | #include "llvm/IR/DataLayout.h" |
28 | #include "llvm/MC/MCInstrItineraries.h" |
29 | #include "llvm/Support/Alignment.h" |
30 | |
31 | #include <string> |
32 | |
33 | #define |
34 | #include "M68kGenSubtargetInfo.inc" |
35 | |
36 | extern bool M68kReserveGP; |
37 | extern bool M68kNoCpload; |
38 | |
39 | namespace llvm { |
40 | class StringRef; |
41 | |
42 | class M68kTargetMachine; |
43 | |
44 | class M68kSubtarget : public M68kGenSubtargetInfo { |
45 | virtual void anchor(); |
46 | |
47 | protected: |
48 | // These define which ISA is supported. Since each Motorola M68k ISA is |
49 | // built on top of the previous one whenever an ISA is selected the previous |
50 | // selected as well. |
51 | enum SubtargetEnum { M00, M10, M20, M30, M40, M60 }; |
52 | SubtargetEnum SubtargetKind = M00; |
53 | |
54 | enum FPKindEnum { M881, M882 }; |
55 | std::optional<FPKindEnum> FPUKind; |
56 | |
57 | std::bitset<M68k::NUM_TARGET_REGS> UserReservedRegister; |
58 | |
59 | InstrItineraryData InstrItins; |
60 | |
61 | /// Small section is used. |
62 | bool UseSmallSection = true; |
63 | |
64 | const M68kTargetMachine &TM; |
65 | |
66 | SelectionDAGTargetInfo TSInfo; |
67 | M68kInstrInfo InstrInfo; |
68 | M68kFrameLowering FrameLowering; |
69 | M68kTargetLowering TLInfo; |
70 | |
71 | /// The minimum alignment known to hold of the stack frame on |
72 | /// entry to the function and which must be maintained by every function. |
73 | unsigned stackAlignment = 8; |
74 | |
75 | Triple TargetTriple; |
76 | |
77 | public: |
78 | /// This constructor initializes the data members to match that |
79 | /// of the specified triple. |
80 | M68kSubtarget(const Triple &TT, StringRef CPU, StringRef FS, |
81 | const M68kTargetMachine &_TM); |
82 | |
83 | /// Parses features string setting specified subtarget options. Definition |
84 | /// of function is auto generated by tblgen. |
85 | void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS); |
86 | |
87 | bool atLeastM68000() const { return SubtargetKind >= M00; } |
88 | bool atLeastM68010() const { return SubtargetKind >= M10; } |
89 | bool atLeastM68020() const { return SubtargetKind >= M20; } |
90 | bool atLeastM68030() const { return SubtargetKind >= M30; } |
91 | bool atLeastM68040() const { return SubtargetKind >= M40; } |
92 | bool atLeastM68060() const { return SubtargetKind >= M60; } |
93 | |
94 | /// Floating point support |
95 | bool hasFPU() const { return FPUKind.has_value(); } |
96 | bool atLeastM68881() const { return hasFPU() && *FPUKind >= M881; } |
97 | bool atLeastM68882() const { return hasFPU() && *FPUKind >= M882; } |
98 | |
99 | bool useSmallSection() const { return UseSmallSection; } |
100 | |
101 | const Triple &getTargetTriple() const { return TargetTriple; } |
102 | |
103 | bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); } |
104 | |
105 | /// Return true if the subtarget allows calls to immediate address. |
106 | bool isLegalToCallImmediateAddr() const; |
107 | |
108 | bool isPositionIndependent() const; |
109 | |
110 | bool isRegisterReservedByUser(Register R) const { |
111 | assert(R < M68k::NUM_TARGET_REGS && "Register out of range" ); |
112 | return UserReservedRegister[R]; |
113 | } |
114 | |
115 | /// Classify a global variable reference for the current subtarget according |
116 | /// to how we should reference it in a non-pcrel context. |
117 | unsigned char classifyLocalReference(const GlobalValue *GV) const; |
118 | |
119 | /// Classify a global variable reference for the current subtarget according |
120 | /// to how we should reference it in a non-pcrel context. |
121 | unsigned char classifyGlobalReference(const GlobalValue *GV, |
122 | const Module &M) const; |
123 | unsigned char classifyGlobalReference(const GlobalValue *GV) const; |
124 | |
125 | /// Classify a external variable reference for the current subtarget according |
126 | /// to how we should reference it in a non-pcrel context. |
127 | unsigned char classifyExternalReference(const Module &M) const; |
128 | |
129 | /// Classify a global function reference for the current subtarget. |
130 | unsigned char classifyGlobalFunctionReference(const GlobalValue *GV, |
131 | const Module &M) const; |
132 | unsigned char |
133 | classifyGlobalFunctionReference(const GlobalValue *GV) const override; |
134 | |
135 | /// Classify a blockaddress reference for the current subtarget according to |
136 | /// how we should reference it in a non-pcrel context. |
137 | unsigned char classifyBlockAddressReference() const; |
138 | |
139 | unsigned getJumpTableEncoding() const; |
140 | |
141 | /// TODO this must be controlled by options like -malign-int and -mshort |
142 | Align getStackAlignment() const { return Align(stackAlignment); } |
143 | |
144 | /// getSlotSize - Stack slot size in bytes. |
145 | unsigned getSlotSize() const { return 4; } |
146 | |
147 | M68kSubtarget &initializeSubtargetDependencies(StringRef CPU, Triple TT, |
148 | StringRef FS, |
149 | const M68kTargetMachine &TM); |
150 | |
151 | const SelectionDAGTargetInfo *getSelectionDAGInfo() const override { |
152 | return &TSInfo; |
153 | } |
154 | |
155 | const M68kInstrInfo *getInstrInfo() const override { return &InstrInfo; } |
156 | |
157 | const M68kFrameLowering *getFrameLowering() const override { |
158 | return &FrameLowering; |
159 | } |
160 | |
161 | const M68kRegisterInfo *getRegisterInfo() const override { |
162 | return &InstrInfo.getRegisterInfo(); |
163 | } |
164 | |
165 | const M68kTargetLowering *getTargetLowering() const override { |
166 | return &TLInfo; |
167 | } |
168 | |
169 | const InstrItineraryData *getInstrItineraryData() const override { |
170 | return &InstrItins; |
171 | } |
172 | |
173 | protected: |
174 | // GlobalISel related APIs. |
175 | std::unique_ptr<CallLowering> CallLoweringInfo; |
176 | std::unique_ptr<InstructionSelector> InstSelector; |
177 | std::unique_ptr<LegalizerInfo> Legalizer; |
178 | std::unique_ptr<RegisterBankInfo> RegBankInfo; |
179 | |
180 | public: |
181 | const CallLowering *getCallLowering() const override; |
182 | InstructionSelector *getInstructionSelector() const override; |
183 | const LegalizerInfo *getLegalizerInfo() const override; |
184 | const RegisterBankInfo *getRegBankInfo() const override; |
185 | }; |
186 | } // namespace llvm |
187 | |
188 | #endif // LLVM_LIB_TARGET_M68K_M68KSUBTARGET_H |
189 | |