1 //===-- LanaiMCTargetDesc.cpp - Lanai Target Descriptions -----------------===//
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 provides Lanai specific target descriptions.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "LanaiMCTargetDesc.h"
14 #include "LanaiInstPrinter.h"
15 #include "LanaiMCAsmInfo.h"
16 #include "TargetInfo/LanaiTargetInfo.h"
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/MC/MCInst.h"
19 #include "llvm/MC/MCInstrAnalysis.h"
20 #include "llvm/MC/MCInstrInfo.h"
21 #include "llvm/MC/MCRegisterInfo.h"
22 #include "llvm/MC/MCStreamer.h"
23 #include "llvm/MC/MCSubtargetInfo.h"
24 #include "llvm/MC/TargetRegistry.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/TargetParser/Triple.h"
27 #include <cstdint>
28 #include <string>
29 
30 #define GET_INSTRINFO_MC_DESC
31 #define ENABLE_INSTR_PREDICATE_VERIFIER
32 #include "LanaiGenInstrInfo.inc"
33 
34 #define GET_SUBTARGETINFO_MC_DESC
35 #include "LanaiGenSubtargetInfo.inc"
36 
37 #define GET_REGINFO_MC_DESC
38 #include "LanaiGenRegisterInfo.inc"
39 
40 using namespace llvm;
41 
42 static MCInstrInfo *createLanaiMCInstrInfo() {
43   MCInstrInfo *X = new MCInstrInfo();
44   InitLanaiMCInstrInfo(X);
45   return X;
46 }
47 
48 static MCRegisterInfo *createLanaiMCRegisterInfo(const Triple & /*TT*/) {
49   MCRegisterInfo *X = new MCRegisterInfo();
50   InitLanaiMCRegisterInfo(X, Lanai::RCA, 0, 0, Lanai::PC);
51   return X;
52 }
53 
54 static MCSubtargetInfo *
55 createLanaiMCSubtargetInfo(const Triple &TT, StringRef CPU, StringRef FS) {
56   std::string CPUName = std::string(CPU);
57   if (CPUName.empty())
58     CPUName = "generic";
59 
60   return createLanaiMCSubtargetInfoImpl(TT, CPUName, /*TuneCPU*/ CPUName, FS);
61 }
62 
63 static MCStreamer *createMCStreamer(const Triple &T, MCContext &Context,
64                                     std::unique_ptr<MCAsmBackend> &&MAB,
65                                     std::unique_ptr<MCObjectWriter> &&OW,
66                                     std::unique_ptr<MCCodeEmitter> &&Emitter,
67                                     bool RelaxAll) {
68   if (!T.isOSBinFormatELF())
69     llvm_unreachable("OS not supported");
70 
71   return createELFStreamer(Context, std::move(MAB), std::move(OW),
72                            std::move(Emitter), RelaxAll);
73 }
74 
75 static MCInstPrinter *createLanaiMCInstPrinter(const Triple & /*T*/,
76                                                unsigned SyntaxVariant,
77                                                const MCAsmInfo &MAI,
78                                                const MCInstrInfo &MII,
79                                                const MCRegisterInfo &MRI) {
80   if (SyntaxVariant == 0)
81     return new LanaiInstPrinter(MAI, MII, MRI);
82   return nullptr;
83 }
84 
85 static MCRelocationInfo *createLanaiElfRelocation(const Triple &TheTriple,
86                                                   MCContext &Ctx) {
87   return createMCRelocationInfo(TheTriple, Ctx);
88 }
89 
90 namespace {
91 
92 class LanaiMCInstrAnalysis : public MCInstrAnalysis {
93 public:
94   explicit LanaiMCInstrAnalysis(const MCInstrInfo *Info)
95       : MCInstrAnalysis(Info) {}
96 
97   bool evaluateBranch(const MCInst &Inst, uint64_t Addr, uint64_t Size,
98                       uint64_t &Target) const override {
99     if (Inst.getNumOperands() == 0)
100       return false;
101     if (!isConditionalBranch(Inst) && !isUnconditionalBranch(Inst) &&
102         !isCall(Inst))
103       return false;
104 
105     if (Info->get(Inst.getOpcode()).operands()[0].OperandType ==
106         MCOI::OPERAND_PCREL) {
107       int64_t Imm = Inst.getOperand(0).getImm();
108       Target = Addr + Size + Imm;
109       return true;
110     } else {
111       int64_t Imm = Inst.getOperand(0).getImm();
112 
113       // Skip case where immediate is 0 as that occurs in file that isn't linked
114       // and the branch target inferred would be wrong.
115       if (Imm == 0)
116         return false;
117 
118       Target = Imm;
119       return true;
120     }
121   }
122 };
123 
124 } // end anonymous namespace
125 
126 static MCInstrAnalysis *createLanaiInstrAnalysis(const MCInstrInfo *Info) {
127   return new LanaiMCInstrAnalysis(Info);
128 }
129 
130 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiTargetMC() {
131   // Register the MC asm info.
132   RegisterMCAsmInfo<LanaiMCAsmInfo> X(getTheLanaiTarget());
133 
134   // Register the MC instruction info.
135   TargetRegistry::RegisterMCInstrInfo(getTheLanaiTarget(),
136                                       createLanaiMCInstrInfo);
137 
138   // Register the MC register info.
139   TargetRegistry::RegisterMCRegInfo(getTheLanaiTarget(),
140                                     createLanaiMCRegisterInfo);
141 
142   // Register the MC subtarget info.
143   TargetRegistry::RegisterMCSubtargetInfo(getTheLanaiTarget(),
144                                           createLanaiMCSubtargetInfo);
145 
146   // Register the MC code emitter
147   TargetRegistry::RegisterMCCodeEmitter(getTheLanaiTarget(),
148                                         createLanaiMCCodeEmitter);
149 
150   // Register the ASM Backend
151   TargetRegistry::RegisterMCAsmBackend(getTheLanaiTarget(),
152                                        createLanaiAsmBackend);
153 
154   // Register the MCInstPrinter.
155   TargetRegistry::RegisterMCInstPrinter(getTheLanaiTarget(),
156                                         createLanaiMCInstPrinter);
157 
158   // Register the ELF streamer.
159   TargetRegistry::RegisterELFStreamer(getTheLanaiTarget(), createMCStreamer);
160 
161   // Register the MC relocation info.
162   TargetRegistry::RegisterMCRelocationInfo(getTheLanaiTarget(),
163                                            createLanaiElfRelocation);
164 
165   // Register the MC instruction analyzer.
166   TargetRegistry::RegisterMCInstrAnalysis(getTheLanaiTarget(),
167                                           createLanaiInstrAnalysis);
168 }
169