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      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 "llvm/MC/MCExpr.h"
     17 #include "llvm/MC/MCInst.h"
     18 #include "llvm/Support/ErrorHandling.h"
     19 #include "llvm/Support/raw_ostream.h"
     20 #include "llvm/ADT/StringExtras.h"
     21 using namespace llvm;
     22 
     23 #define GET_INSTRUCTION_NAME
     24 #include "MipsGenAsmWriter.inc"
     25 
     26 const char* Mips::MipsFCCToString(Mips::CondCode CC) {
     27   switch (CC) {
     28   case FCOND_F:
     29   case FCOND_T:   return "f";
     30   case FCOND_UN:
     31   case FCOND_OR:  return "un";
     32   case FCOND_OEQ:
     33   case FCOND_UNE: return "eq";
     34   case FCOND_UEQ:
     35   case FCOND_ONE: return "ueq";
     36   case FCOND_OLT:
     37   case FCOND_UGE: return "olt";
     38   case FCOND_ULT:
     39   case FCOND_OGE: return "ult";
     40   case FCOND_OLE:
     41   case FCOND_UGT: return "ole";
     42   case FCOND_ULE:
     43   case FCOND_OGT: return "ule";
     44   case FCOND_SF:
     45   case FCOND_ST:  return "sf";
     46   case FCOND_NGLE:
     47   case FCOND_GLE: return "ngle";
     48   case FCOND_SEQ:
     49   case FCOND_SNE: return "seq";
     50   case FCOND_NGL:
     51   case FCOND_GL:  return "ngl";
     52   case FCOND_LT:
     53   case FCOND_NLT: return "lt";
     54   case FCOND_NGE:
     55   case FCOND_GE:  return "nge";
     56   case FCOND_LE:
     57   case FCOND_NLE: return "le";
     58   case FCOND_NGT:
     59   case FCOND_GT:  return "ngt";
     60   }
     61   llvm_unreachable("Impossible condition code!");
     62 }
     63 
     64 StringRef MipsInstPrinter::getOpcodeName(unsigned Opcode) const {
     65   return getInstructionName(Opcode);
     66 }
     67 
     68 void MipsInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
     69   OS << '$' << LowercaseString(getRegisterName(RegNo));
     70 }
     71 
     72 void MipsInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
     73                                 StringRef Annot) {
     74   printInstruction(MI, O);
     75   printAnnotation(O, Annot);
     76 }
     77 
     78 void MipsInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
     79                                    raw_ostream &O) {
     80   const MCOperand &Op = MI->getOperand(OpNo);
     81   if (Op.isReg()) {
     82     printRegName(O, Op.getReg());
     83     return;
     84   }
     85 
     86   if (Op.isImm()) {
     87     O << Op.getImm();
     88     return;
     89   }
     90 
     91   assert(Op.isExpr() && "unknown operand kind in printOperand");
     92   O << *Op.getExpr();
     93 }
     94 
     95 void MipsInstPrinter::printUnsignedImm(const MCInst *MI, int opNum,
     96                                        raw_ostream &O) {
     97   const MCOperand &MO = MI->getOperand(opNum);
     98   if (MO.isImm())
     99     O << (unsigned short int)MO.getImm();
    100   else
    101     printOperand(MI, opNum, O);
    102 }
    103 
    104 void MipsInstPrinter::
    105 printMemOperand(const MCInst *MI, int opNum, raw_ostream &O) {
    106   // Load/Store memory operands -- imm($reg)
    107   // If PIC target the target is loaded as the
    108   // pattern lw $25,%call16($28)
    109   printOperand(MI, opNum+1, O);
    110   O << "(";
    111   printOperand(MI, opNum, O);
    112   O << ")";
    113 }
    114 
    115 void MipsInstPrinter::
    116 printMemOperandEA(const MCInst *MI, int opNum, raw_ostream &O) {
    117   // when using stack locations for not load/store instructions
    118   // print the same way as all normal 3 operand instructions.
    119   printOperand(MI, opNum, O);
    120   O << ", ";
    121   printOperand(MI, opNum+1, O);
    122   return;
    123 }
    124 
    125 void MipsInstPrinter::
    126 printFCCOperand(const MCInst *MI, int opNum, raw_ostream &O) {
    127   const MCOperand& MO = MI->getOperand(opNum);
    128   O << MipsFCCToString((Mips::CondCode)MO.getImm());
    129 }
    130