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