lib/Target/Blackfin/BlackfinAsmPrinter.cpp

   1 //===-- BlackfinAsmPrinter.cpp - Blackfin LLVM assembly writer ------------===//
   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 a printer that converts from our internal representation
  11 // of machine-dependent LLVM code to GAS-format BLACKFIN assembly language.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #define DEBUG_TYPE "asm-printer"
  16 #include "Blackfin.h"
  17 #include "BlackfinInstrInfo.h"
  18 #include "llvm/Constants.h"
  19 #include "llvm/DerivedTypes.h"
  20 #include "llvm/Module.h"
  21 #include "llvm/CodeGen/AsmPrinter.h"
  22 #include "llvm/CodeGen/MachineFunctionPass.h"
  23 #include "llvm/CodeGen/MachineConstantPool.h"
  24 #include "llvm/CodeGen/MachineInstr.h"
  25 #include "llvm/MC/MCStreamer.h"
  26 #include "llvm/MC/MCAsmInfo.h"
  27 #include "llvm/MC/MCContext.h"
  28 #include "llvm/MC/MCSymbol.h"
  29 #include "llvm/Target/Mangler.h"
  30 #include "llvm/Target/TargetData.h"
  31 #include "llvm/Target/TargetLoweringObjectFile.h"
  32 #include "llvm/Target/TargetRegistry.h"
  33 #include "llvm/ADT/SmallString.h"
  34 #include "llvm/Support/ErrorHandling.h"
  35 #include "llvm/Support/raw_ostream.h"
  36 using namespace llvm;
  37
  38 namespace {
  39   class BlackfinAsmPrinter : public AsmPrinter {
  40   public:
  41     BlackfinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
  42       : AsmPrinter(TM, Streamer) {}
  43
  44     virtual const char *getPassName() const {
  45       return "Blackfin Assembly Printer";
  46     }
  47
  48     void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
  49     void printMemoryOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
  50     void printInstruction(const MachineInstr *MI, raw_ostream &O);// autogen'd.
  51     static const char *getRegisterName(unsigned RegNo);
  52
  53     void EmitInstruction(const MachineInstr *MI) {
  54       SmallString<128> Str;
  55       raw_svector_ostream OS(Str);
  56       printInstruction(MI, OS);
  57       OutStreamer.EmitRawText(OS.str());
  58     }
  59     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
  60                          unsigned AsmVariant, const char *ExtraCode,
  61                          raw_ostream &O);
  62     bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
  63                                unsigned AsmVariant, const char *ExtraCode,
  64                                raw_ostream &O);
  65   };
  66 } // end of anonymous namespace
  67
  68 #include "BlackfinGenAsmWriter.inc"
  69
  70 extern "C" void LLVMInitializeBlackfinAsmPrinter() {
  71   RegisterAsmPrinter<BlackfinAsmPrinter> X(TheBlackfinTarget);
  72 }
  73
  74 void BlackfinAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
  75                                       raw_ostream &O) {
  76   const MachineOperand &MO = MI->getOperand(opNum);
  77   switch (MO.getType()) {
  78   case MachineOperand::MO_Register:
  79     assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
  80            "Virtual registers should be already mapped!");
  81     O << getRegisterName(MO.getReg());
  82     break;
  83
  84   case MachineOperand::MO_Immediate:
  85     O << MO.getImm();
  86     break;
  87   case MachineOperand::MO_MachineBasicBlock:
  88     O << *MO.getMBB()->getSymbol();
  89     return;
  90   case MachineOperand::MO_GlobalAddress:
  91     O << *Mang->getSymbol(MO.getGlobal());
  92     printOffset(MO.getOffset(), O);
  93     break;
  94   case MachineOperand::MO_ExternalSymbol:
  95     O << *GetExternalSymbolSymbol(MO.getSymbolName());
  96     break;
  97   case MachineOperand::MO_ConstantPoolIndex:
  98     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
  99       << MO.getIndex();
 100     break;
 101   case MachineOperand::MO_JumpTableIndex:
 102     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 103       << '_' << MO.getIndex();
 104     break;
 105   default:
 106     llvm_unreachable("<unknown operand type>");
 107     break;
 108   }
 109 }
 110
 111 void BlackfinAsmPrinter::printMemoryOperand(const MachineInstr *MI, int opNum,
 112                                             raw_ostream &O) {
 113   printOperand(MI, opNum, O);
 114
 115   if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
 116     return;
 117
 118   O << " + ";
 119   printOperand(MI, opNum+1, O);
 120 }
 121
 122 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 123 ///
 124 bool BlackfinAsmPrinter::PrintAsmOperand(const MachineInstr *MI,
 125                                          unsigned OpNo, unsigned AsmVariant,
 126                                          const char *ExtraCode,
 127                                          raw_ostream &O) {
 128   if (ExtraCode && ExtraCode[0]) {
 129     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 130
 131     switch (ExtraCode[0]) {
 132     default: return true;  // Unknown modifier.
 133     case 'r':
 134       break;
 135     }
 136   }
 137
 138   printOperand(MI, OpNo, O);
 139
 140   return false;
 141 }
 142
 143 bool BlackfinAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 144                                                unsigned OpNo,
 145                                                unsigned AsmVariant,
 146                                                const char *ExtraCode,
 147                                                raw_ostream &O) {
 148   if (ExtraCode && ExtraCode[0])
 149     return true;  // Unknown modifier
 150
 151   O << '[';
 152   printOperand(MI, OpNo, O);
 153   O << ']';
 154
 155   return false;
 156 }