llvm/lib/Target/MSP430/MCTargetDesc/MSP430InstPrinter.cpp

   1 //===-- MSP430InstPrinter.cpp - Convert MSP430 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 MSP430 MCInst to a .s file.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "MSP430InstPrinter.h"
  14 #include "MSP430.h"
  15 #include "llvm/MC/MCAsmInfo.h"
  16 #include "llvm/MC/MCExpr.h"
  17 #include "llvm/MC/MCInst.h"
  18 #include "llvm/MC/MCInstrInfo.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20 #include "llvm/Support/FormattedStream.h"
  21 using namespace llvm;
  22
  23 #define DEBUG_TYPE "asm-printer"
  24
  25 // Include the auto-generated portion of the assembly writer.
  26 #define PRINT_ALIAS_INSTR
  27 #include "MSP430GenAsmWriter.inc"
  28
  29 void MSP430InstPrinter::printRegName(raw_ostream &O, MCRegister Reg) const {
  30   O << getRegisterName(Reg);
  31 }
  32
  33 void MSP430InstPrinter::printInst(const MCInst *MI, uint64_t Address,
  34                                   StringRef Annot, const MCSubtargetInfo &STI,
  35                                   raw_ostream &O) {
  36   if (!printAliasInstr(MI, Address, O))
  37     printInstruction(MI, Address, O);
  38   printAnnotation(O, Annot);
  39 }
  40
  41 void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,
  42                                              raw_ostream &O) {
  43   const MCOperand &Op = MI->getOperand(OpNo);
  44   if (Op.isImm()) {
  45     int64_t Imm = Op.getImm() * 2 + 2;
  46     O << "$";
  47     if (Imm >= 0)
  48       O << '+';
  49     O << Imm;
  50   } else {
  51     assert(Op.isExpr() && "unknown pcrel immediate operand");
  52     Op.getExpr()->print(O, &MAI);
  53   }
  54 }
  55
  56 void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
  57                                      raw_ostream &O, const char *Modifier) {
  58   assert((Modifier == nullptr || Modifier[0] == 0) && "No modifiers supported");
  59   const MCOperand &Op = MI->getOperand(OpNo);
  60   if (Op.isReg()) {
  61     O << getRegisterName(Op.getReg());
  62   } else if (Op.isImm()) {
  63     O << '#' << Op.getImm();
  64   } else {
  65     assert(Op.isExpr() && "unknown operand kind in printOperand");
  66     O << '#';
  67     Op.getExpr()->print(O, &MAI);
  68   }
  69 }
  70
  71 void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,
  72                                            raw_ostream &O,
  73                                            const char *Modifier) {
  74   const MCOperand &Base = MI->getOperand(OpNo);
  75   const MCOperand &Disp = MI->getOperand(OpNo+1);
  76
  77   // Print displacement first
  78
  79   // If the global address expression is a part of displacement field with a
  80   // register base, we should not emit any prefix symbol here, e.g.
  81   //   mov.w &foo, r1
  82   // vs
  83   //   mov.w glb(r1), r2
  84   // Otherwise (!) msp430-as will silently miscompile the output :(
  85   if (Base.getReg() == MSP430::SR)
  86     O << '&';
  87
  88   if (Disp.isExpr())
  89     Disp.getExpr()->print(O, &MAI);
  90   else {
  91     assert(Disp.isImm() && "Expected immediate in displacement field");
  92     O << Disp.getImm();
  93   }
  94
  95   // Print register base field
  96   if ((Base.getReg() != MSP430::SR) &&
  97       (Base.getReg() != MSP430::PC))
  98     O << '(' << getRegisterName(Base.getReg()) << ')';
  99 }
 100
 101 void MSP430InstPrinter::printIndRegOperand(const MCInst *MI, unsigned OpNo,
 102                                            raw_ostream &O) {
 103   const MCOperand &Base = MI->getOperand(OpNo);
 104   O << "@" << getRegisterName(Base.getReg());
 105 }
 106
 107 void MSP430InstPrinter::printPostIndRegOperand(const MCInst *MI, unsigned OpNo,
 108                                                raw_ostream &O) {
 109   const MCOperand &Base = MI->getOperand(OpNo);
 110   O << "@" << getRegisterName(Base.getReg()) << "+";
 111 }
 112
 113 void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,
 114                                        raw_ostream &O) {
 115   unsigned CC = MI->getOperand(OpNo).getImm();
 116
 117   switch (CC) {
 118   default:
 119    llvm_unreachable("Unsupported CC code");
 120   case MSP430CC::COND_E:
 121    O << "eq";
 122    break;
 123   case MSP430CC::COND_NE:
 124    O << "ne";
 125    break;
 126   case MSP430CC::COND_HS:
 127    O << "hs";
 128    break;
 129   case MSP430CC::COND_LO:
 130    O << "lo";
 131    break;
 132   case MSP430CC::COND_GE:
 133    O << "ge";
 134    break;
 135   case MSP430CC::COND_L:
 136    O << 'l';
 137    break;
 138   case MSP430CC::COND_N:
 139    O << 'n';
 140    break;
 141   }
 142 }