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