llvm/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/MCRegister.h"
  18 #include "llvm/MC/MCSymbol.h"
  19 #include "llvm/Support/Casting.h"
  20 #include "llvm/Support/ErrorHandling.h"
  21 #include "llvm/Support/raw_ostream.h"
  22 #include <cassert>
  23
  24 using namespace llvm;
  25
  26 #define DEBUG_TYPE "asm-printer"
  27
  28 #include "XCoreGenAsmWriter.inc"
  29
  30 void XCoreInstPrinter::printRegName(raw_ostream &OS, MCRegister Reg) {
  31   OS << StringRef(getRegisterName(Reg)).lower();
  32 }
  33
  34 void XCoreInstPrinter::printInst(const MCInst *MI, uint64_t Address,
  35                                  StringRef Annot, const MCSubtargetInfo &STI,
  36                                  raw_ostream &O) {
  37   printInstruction(MI, Address, O);
  38   printAnnotation(O, Annot);
  39 }
  40
  41 void XCoreInstPrinter::
  42 printInlineJT(const MCInst *MI, int opNum, raw_ostream &O) {
  43   report_fatal_error("can't handle InlineJT");
  44 }
  45
  46 void XCoreInstPrinter::
  47 printInlineJT32(const MCInst *MI, int opNum, raw_ostream &O) {
  48   report_fatal_error("can't handle InlineJT32");
  49 }
  50
  51 static void printExpr(const MCExpr *Expr, const MCAsmInfo *MAI,
  52                       raw_ostream &OS) {
  53   int Offset = 0;
  54   const MCSymbolRefExpr *SRE;
  55
  56   if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
  57     SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
  58     const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
  59     assert(SRE && CE && "Binary expression must be sym+const.");
  60     Offset = CE->getValue();
  61   } else {
  62     SRE = dyn_cast<MCSymbolRefExpr>(Expr);
  63     assert(SRE && "Unexpected MCExpr type.");
  64   }
  65   assert(SRE->getKind() == MCSymbolRefExpr::VK_None);
  66
  67   SRE->getSymbol().print(OS, MAI);
  68
  69   if (Offset) {
  70     if (Offset > 0)
  71       OS << '+';
  72     OS << Offset;
  73   }
  74 }
  75
  76 void XCoreInstPrinter::
  77 printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O) {
  78   const MCOperand &Op = MI->getOperand(OpNo);
  79   if (Op.isReg()) {
  80     printRegName(O, Op.getReg());
  81     return;
  82   }
  83
  84   if (Op.isImm()) {
  85     O << Op.getImm();
  86     return;
  87   }
  88
  89   assert(Op.isExpr() && "unknown operand kind in printOperand");
  90   printExpr(Op.getExpr(), &MAI, O);
  91 }