lib/Target/MSP430/AsmPrinter/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 "MSP430InstrInfo.h"
  17 #include "MSP430InstPrinter.h"
  18 #include "llvm/MC/MCInst.h"
  19 #include "llvm/MC/MCAsmInfo.h"
  20 #include "llvm/MC/MCExpr.h"
  21 #include "llvm/Support/ErrorHandling.h"
  22 #include "llvm/Support/FormattedStream.h"
  23 using namespace llvm;
  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   printInstruction(MI, O);
  31 }
  32
  33 void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,
  34                                              raw_ostream &O) {
  35   const MCOperand &Op = MI->getOperand(OpNo);
  36   if (Op.isImm())
  37     O << Op.getImm();
  38   else {
  39     assert(Op.isExpr() && "unknown pcrel immediate operand");
  40     O << *Op.getExpr();
  41   }
  42 }
  43
  44 void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
  45                                      raw_ostream &O, const char *Modifier) {
  46   assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
  47   const MCOperand &Op = MI->getOperand(OpNo);
  48   if (Op.isReg()) {
  49     O << getRegisterName(Op.getReg());
  50   } else if (Op.isImm()) {
  51     O << '#' << Op.getImm();
  52   } else {
  53     assert(Op.isExpr() && "unknown operand kind in printOperand");
  54     O << '#' << *Op.getExpr();
  55   }
  56 }
  57
  58 void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,
  59                                            raw_ostream &O,
  60                                            const char *Modifier) {
  61   const MCOperand &Base = MI->getOperand(OpNo);
  62   const MCOperand &Disp = MI->getOperand(OpNo+1);
  63
  64   // Print displacement first
  65
  66   // If the global address expression is a part of displacement field with a
  67   // register base, we should not emit any prefix symbol here, e.g.
  68   //   mov.w &foo, r1
  69   // vs
  70   //   mov.w glb(r1), r2
  71   // Otherwise (!) msp430-as will silently miscompile the output :(
  72   if (!Base.getReg())
  73     O << '&';
  74
  75   if (Disp.isExpr())
  76     O << *Disp.getExpr();
  77   else {
  78     assert(Disp.isImm() && "Expected immediate in displacement field");
  79     O << Disp.getImm();
  80   }
  81
  82   // Print register base field
  83   if (Base.getReg())
  84     O << '(' << getRegisterName(Base.getReg()) << ')';
  85 }
  86
  87 void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,
  88                                        raw_ostream &O) {
  89   unsigned CC = MI->getOperand(OpNo).getImm();
  90
  91   switch (CC) {
  92   default:
  93    llvm_unreachable("Unsupported CC code");
  94    break;
  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 }