llvm/lib/Target/Xtensa/XtensaAsmPrinter.cpp

//===- XtensaAsmPrinter.cpp Xtensa LLVM Assembly Printer ------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to GAS-format Xtensa assembly language.
//
//===----------------------------------------------------------------------===//

#include "XtensaAsmPrinter.h"
#include "TargetInfo/XtensaTargetInfo.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/TargetRegistry.h"

using namespace llvm;

void XtensaAsmPrinter::emitInstruction(const MachineInstr *MI) {
  MCInst LoweredMI;
  lowerToMCInst(MI, LoweredMI);
  EmitToStreamer(*OutStreamer, LoweredMI);
}

MCOperand XtensaAsmPrinter::lowerOperand(const MachineOperand &MO,
                                         unsigned Offset) const {
  MachineOperand::MachineOperandType MOTy = MO.getType();

  switch (MOTy) {
  case MachineOperand::MO_Register:
    // Ignore all implicit register operands.
    if (MO.isImplicit())
      break;
    return MCOperand::createReg(MO.getReg());
  case MachineOperand::MO_Immediate:
    return MCOperand::createImm(MO.getImm() + Offset);
  case MachineOperand::MO_RegisterMask:
    break;
  default:
    report_fatal_error("unknown operand type");
  }

  return MCOperand();
}

void XtensaAsmPrinter::lowerToMCInst(const MachineInstr *MI,
                                     MCInst &OutMI) const {
  OutMI.setOpcode(MI->getOpcode());

  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
    const MachineOperand &MO = MI->getOperand(i);
    MCOperand MCOp = lowerOperand(MO);

    if (MCOp.isValid())
      OutMI.addOperand(MCOp);
  }
}

extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXtensaAsmPrinter() {
  RegisterAsmPrinter<XtensaAsmPrinter> A(getTheXtensaTarget());
}