lib/Target/MSP430/InstPrinter/MSP430InstPrinter.cpp

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