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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 #include "MSP430InstPrinter.h"
     15 #include "MSP430.h"
     16 #include "llvm/MC/MCAsmInfo.h"
     17 #include "llvm/MC/MCExpr.h"
     18 #include "llvm/MC/MCInst.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 
     26 // Include the auto-generated portion of the assembly writer.
     27 #include "MSP430GenAsmWriter.inc"
     28 
     29 void MSP430InstPrinter::printInst(const MCInst *MI, raw_ostream &O,
     30                                   StringRef Annot, const MCSubtargetInfo &STI) {
     31   printInstruction(MI, O);
     32   printAnnotation(O, Annot);
     33 }
     34 
     35 void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,
     36                                              raw_ostream &O) {
     37   const MCOperand &Op = MI->getOperand(OpNo);
     38   if (Op.isImm())
     39     O << Op.getImm();
     40   else {
     41     assert(Op.isExpr() && "unknown pcrel immediate operand");
     42     Op.getExpr()->print(O, &MAI);
     43   }
     44 }
     45 
     46 void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
     47                                      raw_ostream &O, const char *Modifier) {
     48   assert((Modifier == nullptr || Modifier[0] == 0) && "No modifiers supported");
     49   const MCOperand &Op = MI->getOperand(OpNo);
     50   if (Op.isReg()) {
     51     O << getRegisterName(Op.getReg());
     52   } else if (Op.isImm()) {
     53     O << '#' << Op.getImm();
     54   } else {
     55     assert(Op.isExpr() && "unknown operand kind in printOperand");
     56     O << '#';
     57     Op.getExpr()->print(O, &MAI);
     58   }
     59 }
     60 
     61 void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,
     62                                            raw_ostream &O,
     63                                            const char *Modifier) {
     64   const MCOperand &Base = MI->getOperand(OpNo);
     65   const MCOperand &Disp = MI->getOperand(OpNo+1);
     66 
     67   // Print displacement first
     68 
     69   // If the global address expression is a part of displacement field with a
     70   // register base, we should not emit any prefix symbol here, e.g.
     71   //   mov.w &foo, r1
     72   // vs
     73   //   mov.w glb(r1), r2
     74   // Otherwise (!) msp430-as will silently miscompile the output :(
     75   if (!Base.getReg())
     76     O << '&';
     77 
     78   if (Disp.isExpr())
     79     Disp.getExpr()->print(O, &MAI);
     80   else {
     81     assert(Disp.isImm() && "Expected immediate in displacement field");
     82     O << Disp.getImm();
     83   }
     84 
     85   // Print register base field
     86   if (Base.getReg())
     87     O << '(' << getRegisterName(Base.getReg()) << ')';
     88 }
     89 
     90 void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,
     91                                        raw_ostream &O) {
     92   unsigned CC = MI->getOperand(OpNo).getImm();
     93 
     94   switch (CC) {
     95   default:
     96    llvm_unreachable("Unsupported CC code");
     97   case MSP430CC::COND_E:
     98    O << "eq";
     99    break;
    100   case MSP430CC::COND_NE:
    101    O << "ne";
    102    break;
    103   case MSP430CC::COND_HS:
    104    O << "hs";
    105    break;
    106   case MSP430CC::COND_LO:
    107    O << "lo";
    108    break;
    109   case MSP430CC::COND_GE:
    110    O << "ge";
    111    break;
    112   case MSP430CC::COND_L:
    113    O << 'l';
    114    break;
    115   }
    116 }
    117