ARCAsmPrinter.cpp

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//===- ARCAsmPrinter.cpp - ARC LLVM assembly writer -------------*- C++ -*-===//
//
// 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 GNU format ARC assembly language.
//
//===----------------------------------------------------------------------===//
 
#include "ARC.h"
#include "ARCMCInstLower.h"
#include "ARCSubtarget.h"
#include "ARCTargetMachine.h"
#include "MCTargetDesc/ARCInstPrinter.h"
#include "TargetInfo/ARCTargetInfo.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
 
using namespace llvm;
 
#define DEBUG_TYPE "asm-printer"
 
namespace {
 
class ARCAsmPrinter : public AsmPrinter {
  ARCMCInstLower MCInstLowering;
 
public:
  explicit ARCAsmPrinter(TargetMachine &TM,
                         std::unique_ptr<MCStreamer> Streamer)
      : AsmPrinter(TM, std::move(Streamer)),
        MCInstLowering(&OutContext, *this) {}
 
  StringRef getPassName() const override { return "ARC Assembly Printer"; }
  void emitInstruction(const MachineInstr *MI) override;
 
  bool runOnMachineFunction(MachineFunction &MF) override;
};
 
} // end anonymous namespace
 
void ARCAsmPrinter::emitInstruction(const MachineInstr *MI) {
  ARC_MC::verifyInstructionPredicates(MI->getOpcode(),
                                      getSubtargetInfo().getFeatureBits());
 
  SmallString<128> Str;
  raw_svector_ostream O(Str);
 
  switch (MI->getOpcode()) {
  case ARC::DBG_VALUE:
    llvm_unreachable("Should be handled target independently");
    break;
  }
 
  MCInst TmpInst;
  MCInstLowering.Lower(MI, TmpInst);
  EmitToStreamer(*OutStreamer, TmpInst);
}
 
bool ARCAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
  // Functions are 4-byte aligned.
  MF.ensureAlignment(Align(4));
  return AsmPrinter::runOnMachineFunction(MF);
}
 
// Force static initialization.
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCAsmPrinter() {
  RegisterAsmPrinter<ARCAsmPrinter> X(getTheARCTarget());
}