XCoreInstPrinter.cpp

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//===-- XCoreInstPrinter.cpp - Convert XCore MCInst to assembly syntax ----===//
//
// 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 class prints an XCore MCInst to a .s file.
//
//===----------------------------------------------------------------------===//
 
#include "XCoreInstPrinter.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
 
using namespace llvm;
 
#define DEBUG_TYPE "asm-printer"
 
#include "XCoreGenAsmWriter.inc"
 
void XCoreInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
  OS << StringRef(getRegisterName(RegNo)).lower();
}
 
void XCoreInstPrinter::printInst(const MCInst *MI, uint64_t Address,
                                 StringRef Annot, const MCSubtargetInfo &STI,
                                 raw_ostream &O) {
  printInstruction(MI, Address, O);
  printAnnotation(O, Annot);
}
 
void XCoreInstPrinter::
printInlineJT(const MCInst *MI, int opNum, raw_ostream &O) {
  report_fatal_error("can't handle InlineJT");
}
 
void XCoreInstPrinter::
printInlineJT32(const MCInst *MI, int opNum, raw_ostream &O) {
  report_fatal_error("can't handle InlineJT32");
}
 
static void printExpr(const MCExpr *Expr, const MCAsmInfo *MAI,
                      raw_ostream &OS) {
  int Offset = 0;
  const MCSymbolRefExpr *SRE;
 
  if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
    SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
    assert(SRE && CE && "Binary expression must be sym+const.");
    Offset = CE->getValue();
  } else {
    SRE = dyn_cast<MCSymbolRefExpr>(Expr);
    assert(SRE && "Unexpected MCExpr type.");
  }
  assert(SRE->getKind() == MCSymbolRefExpr::VK_None);
 
  SRE->getSymbol().print(OS, MAI);
 
  if (Offset) {
    if (Offset > 0)
      OS << '+';
    OS << Offset;
  }
}
 
void XCoreInstPrinter::
printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O) {
  const MCOperand &Op = MI->getOperand(OpNo);
  if (Op.isReg()) {
    printRegName(O, Op.getReg());
    return;
  }
 
  if (Op.isImm()) {
    O << Op.getImm();
    return;
  }
 
  assert(Op.isExpr() && "unknown operand kind in printOperand");
  printExpr(Op.getExpr(), &MAI, O);
}