contrib/llvm-project/llvm/lib/Target/Lanai/MCTargetDesc/LanaiMCTargetDesc.cpp

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