//===-- SystemZMCTargetDesc.cpp - SystemZ target descriptions -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "SystemZMCTargetDesc.h"
#include "SystemZGNUInstPrinter.h"
#include "SystemZHLASMAsmStreamer.h"
#include "SystemZHLASMInstPrinter.h"
#include "SystemZMCAsmInfo.h"
#include "SystemZTargetStreamer.h"
#include "TargetInfo/SystemZTargetInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/CommandLine.h"

using namespace llvm;

#define GET_INSTRINFO_MC_DESC
#define ENABLE_INSTR_PREDICATE_VERIFIER
#include "SystemZGenInstrInfo.inc"

#define GET_SUBTARGETINFO_MC_DESC
#include "SystemZGenSubtargetInfo.inc"

#define GET_REGINFO_MC_DESC
#include "SystemZGenRegisterInfo.inc"

// Temporary option to assist with the migration to a new HLASMAsmStreamer on
// z/OS
static cl::opt<bool> GNUAsOnzOSCL("emit-gnuas-syntax-on-zos",
                                  cl::desc("Emit GNU Assembly Syntax on z/OS."),
                                  cl::init(true));

const unsigned SystemZMC::GR32Regs[16] = {
    SystemZ::R0L,  SystemZ::R1L,  SystemZ::R2L,  SystemZ::R3L,
    SystemZ::R4L,  SystemZ::R5L,  SystemZ::R6L,  SystemZ::R7L,
    SystemZ::R8L,  SystemZ::R9L,  SystemZ::R10L, SystemZ::R11L,
    SystemZ::R12L, SystemZ::R13L, SystemZ::R14L, SystemZ::R15L};

const unsigned SystemZMC::GRH32Regs[16] = {
    SystemZ::R0H,  SystemZ::R1H,  SystemZ::R2H,  SystemZ::R3H,
    SystemZ::R4H,  SystemZ::R5H,  SystemZ::R6H,  SystemZ::R7H,
    SystemZ::R8H,  SystemZ::R9H,  SystemZ::R10H, SystemZ::R11H,
    SystemZ::R12H, SystemZ::R13H, SystemZ::R14H, SystemZ::R15H};

const unsigned SystemZMC::GR64Regs[16] = {
    SystemZ::R0D,  SystemZ::R1D,  SystemZ::R2D,  SystemZ::R3D,
    SystemZ::R4D,  SystemZ::R5D,  SystemZ::R6D,  SystemZ::R7D,
    SystemZ::R8D,  SystemZ::R9D,  SystemZ::R10D, SystemZ::R11D,
    SystemZ::R12D, SystemZ::R13D, SystemZ::R14D, SystemZ::R15D};

const unsigned SystemZMC::GR128Regs[16] = {
    SystemZ::R0Q, 0, SystemZ::R2Q,  0, SystemZ::R4Q,  0, SystemZ::R6Q,  0,
    SystemZ::R8Q, 0, SystemZ::R10Q, 0, SystemZ::R12Q, 0, SystemZ::R14Q, 0};

const unsigned SystemZMC::FP32Regs[16] = {
    SystemZ::F0S,  SystemZ::F1S,  SystemZ::F2S,  SystemZ::F3S,
    SystemZ::F4S,  SystemZ::F5S,  SystemZ::F6S,  SystemZ::F7S,
    SystemZ::F8S,  SystemZ::F9S,  SystemZ::F10S, SystemZ::F11S,
    SystemZ::F12S, SystemZ::F13S, SystemZ::F14S, SystemZ::F15S};

const unsigned SystemZMC::FP64Regs[16] = {
    SystemZ::F0D,  SystemZ::F1D,  SystemZ::F2D,  SystemZ::F3D,
    SystemZ::F4D,  SystemZ::F5D,  SystemZ::F6D,  SystemZ::F7D,
    SystemZ::F8D,  SystemZ::F9D,  SystemZ::F10D, SystemZ::F11D,
    SystemZ::F12D, SystemZ::F13D, SystemZ::F14D, SystemZ::F15D};

const unsigned SystemZMC::FP128Regs[16] = {
    SystemZ::F0Q, SystemZ::F1Q, 0, 0, SystemZ::F4Q,  SystemZ::F5Q,  0, 0,
    SystemZ::F8Q, SystemZ::F9Q, 0, 0, SystemZ::F12Q, SystemZ::F13Q, 0, 0};

const unsigned SystemZMC::VR32Regs[32] = {
    SystemZ::F0S,  SystemZ::F1S,  SystemZ::F2S,  SystemZ::F3S,  SystemZ::F4S,
    SystemZ::F5S,  SystemZ::F6S,  SystemZ::F7S,  SystemZ::F8S,  SystemZ::F9S,
    SystemZ::F10S, SystemZ::F11S, SystemZ::F12S, SystemZ::F13S, SystemZ::F14S,
    SystemZ::F15S, SystemZ::F16S, SystemZ::F17S, SystemZ::F18S, SystemZ::F19S,
    SystemZ::F20S, SystemZ::F21S, SystemZ::F22S, SystemZ::F23S, SystemZ::F24S,
    SystemZ::F25S, SystemZ::F26S, SystemZ::F27S, SystemZ::F28S, SystemZ::F29S,
    SystemZ::F30S, SystemZ::F31S};

const unsigned SystemZMC::VR64Regs[32] = {
    SystemZ::F0D,  SystemZ::F1D,  SystemZ::F2D,  SystemZ::F3D,  SystemZ::F4D,
    SystemZ::F5D,  SystemZ::F6D,  SystemZ::F7D,  SystemZ::F8D,  SystemZ::F9D,
    SystemZ::F10D, SystemZ::F11D, SystemZ::F12D, SystemZ::F13D, SystemZ::F14D,
    SystemZ::F15D, SystemZ::F16D, SystemZ::F17D, SystemZ::F18D, SystemZ::F19D,
    SystemZ::F20D, SystemZ::F21D, SystemZ::F22D, SystemZ::F23D, SystemZ::F24D,
    SystemZ::F25D, SystemZ::F26D, SystemZ::F27D, SystemZ::F28D, SystemZ::F29D,
    SystemZ::F30D, SystemZ::F31D};

const unsigned SystemZMC::VR128Regs[32] = {
    SystemZ::V0,  SystemZ::V1,  SystemZ::V2,  SystemZ::V3,  SystemZ::V4,
    SystemZ::V5,  SystemZ::V6,  SystemZ::V7,  SystemZ::V8,  SystemZ::V9,
    SystemZ::V10, SystemZ::V11, SystemZ::V12, SystemZ::V13, SystemZ::V14,
    SystemZ::V15, SystemZ::V16, SystemZ::V17, SystemZ::V18, SystemZ::V19,
    SystemZ::V20, SystemZ::V21, SystemZ::V22, SystemZ::V23, SystemZ::V24,
    SystemZ::V25, SystemZ::V26, SystemZ::V27, SystemZ::V28, SystemZ::V29,
    SystemZ::V30, SystemZ::V31};

const unsigned SystemZMC::AR32Regs[16] = {
    SystemZ::A0,  SystemZ::A1,  SystemZ::A2,  SystemZ::A3,
    SystemZ::A4,  SystemZ::A5,  SystemZ::A6,  SystemZ::A7,
    SystemZ::A8,  SystemZ::A9,  SystemZ::A10, SystemZ::A11,
    SystemZ::A12, SystemZ::A13, SystemZ::A14, SystemZ::A15};

const unsigned SystemZMC::CR64Regs[16] = {
    SystemZ::C0,  SystemZ::C1,  SystemZ::C2,  SystemZ::C3,
    SystemZ::C4,  SystemZ::C5,  SystemZ::C6,  SystemZ::C7,
    SystemZ::C8,  SystemZ::C9,  SystemZ::C10, SystemZ::C11,
    SystemZ::C12, SystemZ::C13, SystemZ::C14, SystemZ::C15};

unsigned SystemZMC::getFirstReg(unsigned Reg) {
  static unsigned Map[SystemZ::NUM_TARGET_REGS];
  static bool Initialized = false;
  if (!Initialized) {
    for (unsigned I = 0; I < 16; ++I) {
      Map[GR32Regs[I]] = I;
      Map[GRH32Regs[I]] = I;
      Map[GR64Regs[I]] = I;
      Map[GR128Regs[I]] = I;
      Map[FP128Regs[I]] = I;
      Map[AR32Regs[I]] = I;
    }
    for (unsigned I = 0; I < 32; ++I) {
      Map[VR32Regs[I]] = I;
      Map[VR64Regs[I]] = I;
      Map[VR128Regs[I]] = I;
    }
  }
  assert(Reg < SystemZ::NUM_TARGET_REGS);
  return Map[Reg];
}

static MCAsmInfo *createSystemZMCAsmInfo(const MCRegisterInfo &MRI,
                                         const Triple &TT,
                                         const MCTargetOptions &Options) {
  if (TT.isOSzOS())
    return new SystemZMCAsmInfoGOFF(TT);

  MCAsmInfo *MAI = new SystemZMCAsmInfoELF(TT);
  MCCFIInstruction Inst = MCCFIInstruction::cfiDefCfa(
      nullptr, MRI.getDwarfRegNum(SystemZ::R15D, true),
      SystemZMC::ELFCFAOffsetFromInitialSP);
  MAI->addInitialFrameState(Inst);
  return MAI;
}

static MCInstrInfo *createSystemZMCInstrInfo() {
  MCInstrInfo *X = new MCInstrInfo();
  InitSystemZMCInstrInfo(X);
  return X;
}

static MCRegisterInfo *createSystemZMCRegisterInfo(const Triple &TT) {
  MCRegisterInfo *X = new MCRegisterInfo();
  InitSystemZMCRegisterInfo(X, SystemZ::R14D);
  return X;
}

static MCSubtargetInfo *
createSystemZMCSubtargetInfo(const Triple &TT, StringRef CPU, StringRef FS) {
  return createSystemZMCSubtargetInfoImpl(TT, CPU, /*TuneCPU*/ CPU, FS);
}

static MCInstPrinter *createSystemZMCInstPrinter(const Triple &T,
                                                 unsigned SyntaxVariant,
                                                 const MCAsmInfo &MAI,
                                                 const MCInstrInfo &MII,
                                                 const MCRegisterInfo &MRI) {
  if (SyntaxVariant == AD_HLASM)
    return new SystemZHLASMInstPrinter(MAI, MII, MRI);

  return new SystemZGNUInstPrinter(MAI, MII, MRI);
}

static MCTargetStreamer *createAsmTargetStreamer(MCStreamer &S,
                                                 formatted_raw_ostream &OS,
                                                 MCInstPrinter *InstPrint) {
  if (S.getContext().getTargetTriple().isOSzOS())
    return new SystemZTargetHLASMStreamer(S, OS);
  else
    return new SystemZTargetGNUStreamer(S, OS);
}

static MCStreamer *createAsmStreamer(MCContext &Ctx,
                                     std::unique_ptr<formatted_raw_ostream> OS,
                                     MCInstPrinter *IP,
                                     std::unique_ptr<MCCodeEmitter> CE,
                                     std::unique_ptr<MCAsmBackend> TAB) {

  auto TT = Ctx.getTargetTriple();
  if (TT.isOSzOS() && !GNUAsOnzOSCL)
    return new SystemZHLASMAsmStreamer(Ctx, std::move(OS), IP, std::move(CE),
                                       std::move(TAB));

  return llvm::createAsmStreamer(Ctx, std::move(OS), IP, std::move(CE),
                                 std::move(TAB));
}

static MCTargetStreamer *
createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
  if (S.getContext().getTargetTriple().isOSzOS())
    return new SystemZTargetGOFFStreamer(S);
  else
    return new SystemZTargetELFStreamer(S);
}

static MCTargetStreamer *
createNullTargetStreamer(MCStreamer &S) {
  return new SystemZTargetStreamer(S);
}

static MCInstrAnalysis *createSystemZMCInstrAnalysis(const MCInstrInfo *Info) {
  return new MCInstrAnalysis(Info);
}

extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSystemZTargetMC() {
  // Register the MCAsmInfo.
  TargetRegistry::RegisterMCAsmInfo(getTheSystemZTarget(),
                                    createSystemZMCAsmInfo);

  // Register the MCCodeEmitter.
  TargetRegistry::RegisterMCCodeEmitter(getTheSystemZTarget(),
                                        createSystemZMCCodeEmitter);

  // Register the MCInstrInfo.
  TargetRegistry::RegisterMCInstrInfo(getTheSystemZTarget(),
                                      createSystemZMCInstrInfo);

  // Register the MCRegisterInfo.
  TargetRegistry::RegisterMCRegInfo(getTheSystemZTarget(),
                                    createSystemZMCRegisterInfo);

  // Register the MCSubtargetInfo.
  TargetRegistry::RegisterMCSubtargetInfo(getTheSystemZTarget(),
                                          createSystemZMCSubtargetInfo);

  // Register the MCAsmBackend.
  TargetRegistry::RegisterMCAsmBackend(getTheSystemZTarget(),
                                       createSystemZMCAsmBackend);

  // Register the MCInstPrinter.
  TargetRegistry::RegisterMCInstPrinter(getTheSystemZTarget(),
                                        createSystemZMCInstPrinter);

  // Register the asm streamer.
  TargetRegistry::RegisterAsmStreamer(getTheSystemZTarget(), createAsmStreamer);

  // Register the asm target streamer.
  TargetRegistry::RegisterAsmTargetStreamer(getTheSystemZTarget(),
                                            createAsmTargetStreamer);

  // Register the obj streamer
  TargetRegistry::RegisterObjectTargetStreamer(getTheSystemZTarget(),
                                               createObjectTargetStreamer);

  // Register the null streamer
  TargetRegistry::RegisterNullTargetStreamer(getTheSystemZTarget(),
                                             createNullTargetStreamer);

  // Register the MCInstrAnalysis.
  TargetRegistry::RegisterMCInstrAnalysis(getTheSystemZTarget(),
                                          createSystemZMCInstrAnalysis);
}