lib/Target/XCore/MCTargetDesc/XCoreInstPrinter.cpp

   1 //===-- XCoreInstPrinter.cpp - Convert XCore MCInst to assembly syntax ----===//
   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 class prints an XCore MCInst to a .s file.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "XCoreInstPrinter.h"
  14 #include "llvm/ADT/StringRef.h"
  15 #include "llvm/MC/MCExpr.h"
  16 #include "llvm/MC/MCInst.h"
  17 #include "llvm/MC/MCSymbol.h"
  18 #include "llvm/Support/Casting.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 #include <cassert>
  22
  23 using namespace llvm;
  24
  25 #define DEBUG_TYPE "asm-printer"
  26
  27 #include "XCoreGenAsmWriter.inc"
  28
  29 void XCoreInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
  30   OS << StringRef(getRegisterName(RegNo)).lower();
  31 }
  32
  33 void XCoreInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
  34                                  StringRef Annot, const MCSubtargetInfo &STI) {
  35   printInstruction(MI, O);
  36   printAnnotation(O, Annot);
  37 }
  38
  39 void XCoreInstPrinter::
  40 printInlineJT(const MCInst *MI, int opNum, raw_ostream &O) {
  41   report_fatal_error("can't handle InlineJT");
  42 }
  43
  44 void XCoreInstPrinter::
  45 printInlineJT32(const MCInst *MI, int opNum, raw_ostream &O) {
  46   report_fatal_error("can't handle InlineJT32");
  47 }
  48
  49 static void printExpr(const MCExpr *Expr, const MCAsmInfo *MAI,
  50                       raw_ostream &OS) {
  51   int Offset = 0;
  52   const MCSymbolRefExpr *SRE;
  53
  54   if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
  55     SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
  56     const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
  57     assert(SRE && CE && "Binary expression must be sym+const.");
  58     Offset = CE->getValue();
  59   } else {
  60     SRE = dyn_cast<MCSymbolRefExpr>(Expr);
  61     assert(SRE && "Unexpected MCExpr type.");
  62   }
  63   assert(SRE->getKind() == MCSymbolRefExpr::VK_None);
  64
  65   SRE->getSymbol().print(OS, MAI);
  66
  67   if (Offset) {
  68     if (Offset > 0)
  69       OS << '+';
  70     OS << Offset;
  71   }
  72 }
  73
  74 void XCoreInstPrinter::
  75 printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O) {
  76   const MCOperand &Op = MI->getOperand(OpNo);
  77   if (Op.isReg()) {
  78     printRegName(O, Op.getReg());
  79     return;
  80   }
  81
  82   if (Op.isImm()) {
  83     O << Op.getImm();
  84     return;
  85   }
  86
  87   assert(Op.isExpr() && "unknown operand kind in printOperand");
  88   printExpr(Op.getExpr(), &MAI, O);
  89 }