1 //===-- MipsInstPrinter.cpp - Convert Mips 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 Mips MCInst to a .s file. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #define DEBUG_TYPE "asm-printer" 15 #include "MipsInstPrinter.h" 16 #include "MipsInstrInfo.h" 17 #include "llvm/ADT/StringExtras.h" 18 #include "llvm/MC/MCExpr.h" 19 #include "llvm/MC/MCInst.h" 20 #include "llvm/MC/MCInstrInfo.h" 21 #include "llvm/MC/MCSymbol.h" 22 #include "llvm/Support/ErrorHandling.h" 23 #include "llvm/Support/raw_ostream.h" 24 using namespace llvm; 25 26 #define PRINT_ALIAS_INSTR 27 #include "MipsGenAsmWriter.inc" 28 29 const char* Mips::MipsFCCToString(Mips::CondCode CC) { 30 switch (CC) { 31 case FCOND_F: 32 case FCOND_T: return "f"; 33 case FCOND_UN: 34 case FCOND_OR: return "un"; 35 case FCOND_OEQ: 36 case FCOND_UNE: return "eq"; 37 case FCOND_UEQ: 38 case FCOND_ONE: return "ueq"; 39 case FCOND_OLT: 40 case FCOND_UGE: return "olt"; 41 case FCOND_ULT: 42 case FCOND_OGE: return "ult"; 43 case FCOND_OLE: 44 case FCOND_UGT: return "ole"; 45 case FCOND_ULE: 46 case FCOND_OGT: return "ule"; 47 case FCOND_SF: 48 case FCOND_ST: return "sf"; 49 case FCOND_NGLE: 50 case FCOND_GLE: return "ngle"; 51 case FCOND_SEQ: 52 case FCOND_SNE: return "seq"; 53 case FCOND_NGL: 54 case FCOND_GL: return "ngl"; 55 case FCOND_LT: 56 case FCOND_NLT: return "lt"; 57 case FCOND_NGE: 58 case FCOND_GE: return "nge"; 59 case FCOND_LE: 60 case FCOND_NLE: return "le"; 61 case FCOND_NGT: 62 case FCOND_GT: return "ngt"; 63 } 64 llvm_unreachable("Impossible condition code!"); 65 } 66 67 void MipsInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const { 68 OS << '$' << StringRef(getRegisterName(RegNo)).lower(); 69 } 70 71 void MipsInstPrinter::printInst(const MCInst *MI, raw_ostream &O, 72 StringRef Annot) { 73 switch (MI->getOpcode()) { 74 default: 75 break; 76 case Mips::RDHWR: 77 case Mips::RDHWR64: 78 O << "\t.set\tpush\n"; 79 O << "\t.set\tmips32r2\n"; 80 } 81 82 // Try to print any aliases first. 83 if (!printAliasInstr(MI, O)) 84 printInstruction(MI, O); 85 printAnnotation(O, Annot); 86 87 switch (MI->getOpcode()) { 88 default: 89 break; 90 case Mips::RDHWR: 91 case Mips::RDHWR64: 92 O << "\n\t.set\tpop"; 93 } 94 } 95 96 static void printExpr(const MCExpr *Expr, raw_ostream &OS) { 97 int Offset = 0; 98 const MCSymbolRefExpr *SRE; 99 100 if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) { 101 SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS()); 102 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS()); 103 assert(SRE && CE && "Binary expression must be sym+const."); 104 Offset = CE->getValue(); 105 } 106 else if (!(SRE = dyn_cast<MCSymbolRefExpr>(Expr))) 107 assert(false && "Unexpected MCExpr type."); 108 109 MCSymbolRefExpr::VariantKind Kind = SRE->getKind(); 110 111 switch (Kind) { 112 default: llvm_unreachable("Invalid kind!"); 113 case MCSymbolRefExpr::VK_None: break; 114 case MCSymbolRefExpr::VK_Mips_GPREL: OS << "%gp_rel("; break; 115 case MCSymbolRefExpr::VK_Mips_GOT_CALL: OS << "%call16("; break; 116 case MCSymbolRefExpr::VK_Mips_GOT16: OS << "%got("; break; 117 case MCSymbolRefExpr::VK_Mips_GOT: OS << "%got("; break; 118 case MCSymbolRefExpr::VK_Mips_ABS_HI: OS << "%hi("; break; 119 case MCSymbolRefExpr::VK_Mips_ABS_LO: OS << "%lo("; break; 120 case MCSymbolRefExpr::VK_Mips_TLSGD: OS << "%tlsgd("; break; 121 case MCSymbolRefExpr::VK_Mips_TLSLDM: OS << "%tlsldm("; break; 122 case MCSymbolRefExpr::VK_Mips_DTPREL_HI: OS << "%dtprel_hi("; break; 123 case MCSymbolRefExpr::VK_Mips_DTPREL_LO: OS << "%dtprel_lo("; break; 124 case MCSymbolRefExpr::VK_Mips_GOTTPREL: OS << "%gottprel("; break; 125 case MCSymbolRefExpr::VK_Mips_TPREL_HI: OS << "%tprel_hi("; break; 126 case MCSymbolRefExpr::VK_Mips_TPREL_LO: OS << "%tprel_lo("; break; 127 case MCSymbolRefExpr::VK_Mips_GPOFF_HI: OS << "%hi(%neg(%gp_rel("; break; 128 case MCSymbolRefExpr::VK_Mips_GPOFF_LO: OS << "%lo(%neg(%gp_rel("; break; 129 case MCSymbolRefExpr::VK_Mips_GOT_DISP: OS << "%got_disp("; break; 130 case MCSymbolRefExpr::VK_Mips_GOT_PAGE: OS << "%got_page("; break; 131 case MCSymbolRefExpr::VK_Mips_GOT_OFST: OS << "%got_ofst("; break; 132 case MCSymbolRefExpr::VK_Mips_HIGHER: OS << "%higher("; break; 133 case MCSymbolRefExpr::VK_Mips_HIGHEST: OS << "%highest("; break; 134 case MCSymbolRefExpr::VK_Mips_GOT_HI16: OS << "%got_hi("; break; 135 case MCSymbolRefExpr::VK_Mips_GOT_LO16: OS << "%got_lo("; break; 136 case MCSymbolRefExpr::VK_Mips_CALL_HI16: OS << "%call_hi("; break; 137 case MCSymbolRefExpr::VK_Mips_CALL_LO16: OS << "%call_lo("; break; 138 } 139 140 OS << SRE->getSymbol(); 141 142 if (Offset) { 143 if (Offset > 0) 144 OS << '+'; 145 OS << Offset; 146 } 147 148 if ((Kind == MCSymbolRefExpr::VK_Mips_GPOFF_HI) || 149 (Kind == MCSymbolRefExpr::VK_Mips_GPOFF_LO)) 150 OS << ")))"; 151 else if (Kind != MCSymbolRefExpr::VK_None) 152 OS << ')'; 153 } 154 155 void MipsInstPrinter::printCPURegs(const MCInst *MI, unsigned OpNo, 156 raw_ostream &O) { 157 printRegName(O, MI->getOperand(OpNo).getReg()); 158 } 159 160 void MipsInstPrinter::printOperand(const MCInst *MI, unsigned OpNo, 161 raw_ostream &O) { 162 const MCOperand &Op = MI->getOperand(OpNo); 163 if (Op.isReg()) { 164 printRegName(O, Op.getReg()); 165 return; 166 } 167 168 if (Op.isImm()) { 169 O << Op.getImm(); 170 return; 171 } 172 173 assert(Op.isExpr() && "unknown operand kind in printOperand"); 174 printExpr(Op.getExpr(), O); 175 } 176 177 void MipsInstPrinter::printUnsignedImm(const MCInst *MI, int opNum, 178 raw_ostream &O) { 179 const MCOperand &MO = MI->getOperand(opNum); 180 if (MO.isImm()) 181 O << (unsigned short int)MO.getImm(); 182 else 183 printOperand(MI, opNum, O); 184 } 185 186 void MipsInstPrinter:: 187 printMemOperand(const MCInst *MI, int opNum, raw_ostream &O) { 188 // Load/Store memory operands -- imm($reg) 189 // If PIC target the target is loaded as the 190 // pattern lw $25,%call16($28) 191 printOperand(MI, opNum+1, O); 192 O << "("; 193 printOperand(MI, opNum, O); 194 O << ")"; 195 } 196 197 void MipsInstPrinter:: 198 printMemOperandEA(const MCInst *MI, int opNum, raw_ostream &O) { 199 // when using stack locations for not load/store instructions 200 // print the same way as all normal 3 operand instructions. 201 printOperand(MI, opNum, O); 202 O << ", "; 203 printOperand(MI, opNum+1, O); 204 return; 205 } 206 207 void MipsInstPrinter:: 208 printFCCOperand(const MCInst *MI, int opNum, raw_ostream &O) { 209 const MCOperand& MO = MI->getOperand(opNum); 210 O << MipsFCCToString((Mips::CondCode)MO.getImm()); 211 } 212
