Home | History | Annotate | Download | only in Sparc 
      1 //===-- SparcMCInstLower.cpp - Convert Sparc MachineInstr to MCInst -------===//
      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 file contains code to lower Sparc MachineInstrs to their corresponding
     11 // MCInst records.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "Sparc.h"
     16 #include "MCTargetDesc/SparcMCExpr.h"
     17 #include "llvm/CodeGen/AsmPrinter.h"
     18 #include "llvm/CodeGen/MachineFunction.h"
     19 #include "llvm/CodeGen/MachineInstr.h"
     20 #include "llvm/CodeGen/MachineOperand.h"
     21 #include "llvm/IR/Mangler.h"
     22 #include "llvm/MC/MCAsmInfo.h"
     23 #include "llvm/MC/MCContext.h"
     24 #include "llvm/MC/MCExpr.h"
     25 #include "llvm/MC/MCInst.h"
     26 
     27 using namespace llvm;
     28 
     29 
     30 static MCOperand LowerSymbolOperand(const MachineInstr *MI,
     31                                     const MachineOperand &MO,
     32                                     AsmPrinter &AP) {
     33 
     34   SparcMCExpr::VariantKind Kind =
     35     (SparcMCExpr::VariantKind)MO.getTargetFlags();
     36   const MCSymbol *Symbol = nullptr;
     37 
     38   switch(MO.getType()) {
     39   default: llvm_unreachable("Unknown type in LowerSymbolOperand");
     40   case MachineOperand::MO_MachineBasicBlock:
     41     Symbol = MO.getMBB()->getSymbol();
     42     break;
     43 
     44   case MachineOperand::MO_GlobalAddress:
     45     Symbol = AP.getSymbol(MO.getGlobal());
     46     break;
     47 
     48   case MachineOperand::MO_BlockAddress:
     49     Symbol = AP.GetBlockAddressSymbol(MO.getBlockAddress());
     50     break;
     51 
     52   case MachineOperand::MO_ExternalSymbol:
     53     Symbol = AP.GetExternalSymbolSymbol(MO.getSymbolName());
     54     break;
     55 
     56   case MachineOperand::MO_ConstantPoolIndex:
     57     Symbol = AP.GetCPISymbol(MO.getIndex());
     58     break;
     59   }
     60 
     61   const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::create(Symbol,
     62                                                          AP.OutContext);
     63   const SparcMCExpr *expr = SparcMCExpr::create(Kind, MCSym,
     64                                                 AP.OutContext);
     65   return MCOperand::createExpr(expr);
     66 }
     67 
     68 static MCOperand LowerOperand(const MachineInstr *MI,
     69                               const MachineOperand &MO,
     70                               AsmPrinter &AP) {
     71   switch(MO.getType()) {
     72   default: llvm_unreachable("unknown operand type"); break;
     73   case MachineOperand::MO_Register:
     74     if (MO.isImplicit())
     75       break;
     76     return MCOperand::createReg(MO.getReg());
     77 
     78   case MachineOperand::MO_Immediate:
     79     return MCOperand::createImm(MO.getImm());
     80 
     81   case MachineOperand::MO_MachineBasicBlock:
     82   case MachineOperand::MO_GlobalAddress:
     83   case MachineOperand::MO_BlockAddress:
     84   case MachineOperand::MO_ExternalSymbol:
     85   case MachineOperand::MO_ConstantPoolIndex:
     86     return LowerSymbolOperand(MI, MO, AP);
     87 
     88   case MachineOperand::MO_RegisterMask:   break;
     89 
     90   }
     91   return MCOperand();
     92 }
     93 
     94 void llvm::LowerSparcMachineInstrToMCInst(const MachineInstr *MI,
     95                                           MCInst &OutMI,
     96                                           AsmPrinter &AP)
     97 {
     98 
     99   OutMI.setOpcode(MI->getOpcode());
    100 
    101   for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
    102     const MachineOperand &MO = MI->getOperand(i);
    103     MCOperand MCOp = LowerOperand(MI, MO, AP);
    104 
    105     if (MCOp.isValid())
    106       OutMI.addOperand(MCOp);
    107   }
    108 }
    109