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      1 //===-- MSP430InstPrinter.cpp - Convert MSP430 MCInst to assembly syntax --===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This class prints an MSP430 MCInst to a .s file.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #define DEBUG_TYPE "asm-printer"
     15 #include "MSP430InstPrinter.h"
     16 #include "MSP430.h"
     17 #include "llvm/MC/MCAsmInfo.h"
     18 #include "llvm/MC/MCExpr.h"
     19 #include "llvm/MC/MCInst.h"
     20 #include "llvm/Support/ErrorHandling.h"
     21 #include "llvm/Support/FormattedStream.h"
     22 using namespace llvm;
     23 
     24 
     25 // Include the auto-generated portion of the assembly writer.
     26 #include "MSP430GenAsmWriter.inc"
     27 
     28 void MSP430InstPrinter::printInst(const MCInst *MI, raw_ostream &O,
     29                                   StringRef Annot) {
     30   printInstruction(MI, O);
     31   printAnnotation(O, Annot);
     32 }
     33 
     34 void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,
     35                                              raw_ostream &O) {
     36   const MCOperand &Op = MI->getOperand(OpNo);
     37   if (Op.isImm())
     38     O << Op.getImm();
     39   else {
     40     assert(Op.isExpr() && "unknown pcrel immediate operand");
     41     O << *Op.getExpr();
     42   }
     43 }
     44 
     45 void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
     46                                      raw_ostream &O, const char *Modifier) {
     47   assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
     48   const MCOperand &Op = MI->getOperand(OpNo);
     49   if (Op.isReg()) {
     50     O << getRegisterName(Op.getReg());
     51   } else if (Op.isImm()) {
     52     O << '#' << Op.getImm();
     53   } else {
     54     assert(Op.isExpr() && "unknown operand kind in printOperand");
     55     O << '#' << *Op.getExpr();
     56   }
     57 }
     58 
     59 void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,
     60                                            raw_ostream &O,
     61                                            const char *Modifier) {
     62   const MCOperand &Base = MI->getOperand(OpNo);
     63   const MCOperand &Disp = MI->getOperand(OpNo+1);
     64 
     65   // Print displacement first
     66 
     67   // If the global address expression is a part of displacement field with a
     68   // register base, we should not emit any prefix symbol here, e.g.
     69   //   mov.w &foo, r1
     70   // vs
     71   //   mov.w glb(r1), r2
     72   // Otherwise (!) msp430-as will silently miscompile the output :(
     73   if (!Base.getReg())
     74     O << '&';
     75 
     76   if (Disp.isExpr())
     77     O << *Disp.getExpr();
     78   else {
     79     assert(Disp.isImm() && "Expected immediate in displacement field");
     80     O << Disp.getImm();
     81   }
     82 
     83   // Print register base field
     84   if (Base.getReg())
     85     O << '(' << getRegisterName(Base.getReg()) << ')';
     86 }
     87 
     88 void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,
     89                                        raw_ostream &O) {
     90   unsigned CC = MI->getOperand(OpNo).getImm();
     91 
     92   switch (CC) {
     93   default:
     94    llvm_unreachable("Unsupported CC code");
     95   case MSP430CC::COND_E:
     96    O << "eq";
     97    break;
     98   case MSP430CC::COND_NE:
     99    O << "ne";
    100    break;
    101   case MSP430CC::COND_HS:
    102    O << "hs";
    103    break;
    104   case MSP430CC::COND_LO:
    105    O << "lo";
    106    break;
    107   case MSP430CC::COND_GE:
    108    O << "ge";
    109    break;
    110   case MSP430CC::COND_L:
    111    O << 'l';
    112    break;
    113   }
    114 }
    115