AsmPrinter.cpp

  LLVMContext &Context = CFP->getContext();
  const TargetData *TD = TM.getTargetData();
  if (CFP->getType() == Type::getDoubleTy(Context)) {
    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
    if (TAI->getData64bitsDirective(AddrSpace)) {
      O << TAI->getData64bitsDirective(AddrSpace) << i;
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString() << " double " << Val;
      }
      O << '\n';
    } else if (TD->isBigEndian()) {
      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " most significant word of double " << Val;
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " least significant word of double " << Val;
      }
      O << '\n';
    } else {
      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " least significant word of double " << Val;
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " most significant word of double " << Val;
      }
      O << '\n';
    }
    return;
  } else if (CFP->getType() == Type::getFloatTy(Context)) {
    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
    O << TAI->getData32bitsDirective(AddrSpace)
      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
    if (VerboseAsm) {
      O.PadToColumn(TAI->getCommentColumn());
      O << TAI->getCommentString() << " float " << Val;
    }
    O << '\n';
    return;
  } else if (CFP->getType() == Type::getX86_FP80Ty(Context)) {
    // all long double variants are printed as hex
    // api needed to prevent premature destruction
    APInt api = CFP->getValueAPF().bitcastToAPInt();
    const uint64_t *p = api.getRawData();
    // Convert to double so we can print the approximate val as a comment.
    APFloat DoubleVal = CFP->getValueAPF();
    bool ignored;
    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
                      &ignored);
    if (TD->isBigEndian()) {
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " most significant halfword of x86_fp80 ~"
          << DoubleVal.convertToDouble();
      }
      O << '\n';
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString() << " next halfword";
      }
      O << '\n';
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString() << " next halfword";
      }
      O << '\n';
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString() << " next halfword";
      }
      O << '\n';
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " least significant halfword";
      }
      O << '\n';
     } else {
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " least significant halfword of x86_fp80 ~"
          << DoubleVal.convertToDouble();
      }
      O << '\n';
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " next halfword";
      }
      O << '\n';
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " next halfword";
      }
      O << '\n';
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " next halfword";
      }
      O << '\n';
      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " most significant halfword";
      }
      O << '\n';
    }
    EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
              TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
    return;
  } else if (CFP->getType() == Type::getPPC_FP128Ty(Context)) {
    // all long double variants are printed as hex
    // api needed to prevent premature destruction
    APInt api = CFP->getValueAPF().bitcastToAPInt();
    const uint64_t *p = api.getRawData();
    if (TD->isBigEndian()) {
      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " most significant word of ppc_fp128";
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
        << " next word";
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " next word";
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " least significant word";
      }
      O << '\n';
     } else {
      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " least significant word of ppc_fp128";
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " next word";
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " next word";
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " most significant word";
      }
      O << '\n';
    }
    return;
  } else llvm_unreachable("Floating point constant type not handled");
}

void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
                                            unsigned AddrSpace) {
  const TargetData *TD = TM.getTargetData();
  unsigned BitWidth = CI->getBitWidth();
  assert(isPowerOf2_32(BitWidth) &&
         "Non-power-of-2-sized integers not handled!");

  // We don't expect assemblers to support integer data directives
  // for more than 64 bits, so we emit the data in at most 64-bit
  // quantities at a time.
  const uint64_t *RawData = CI->getValue().getRawData();
  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
    uint64_t Val;
    if (TD->isBigEndian())
      Val = RawData[e - i - 1];
    else
      Val = RawData[i];

    if (TAI->getData64bitsDirective(AddrSpace))
      O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n';
    else if (TD->isBigEndian()) {
      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " most significant half of i64 " << Val;
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " least significant half of i64 " << Val;
      }
      O << '\n';
    } else {
      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " least significant half of i64 " << Val;
      }
      O << '\n';
      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
      if (VerboseAsm) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString()
          << " most significant half of i64 " << Val;
      }
      O << '\n';
    }
  }
}

/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
  const TargetData *TD = TM.getTargetData();
  const Type *type = CV->getType();
  unsigned Size = TD->getTypeAllocSize(type);

  if (CV->isNullValue() || isa<UndefValue>(CV)) {
    EmitZeros(Size, AddrSpace);
    return;
  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
    EmitGlobalConstantArray(CVA , AddrSpace);
    return;
  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
    EmitGlobalConstantStruct(CVS, AddrSpace);
    return;
  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
    EmitGlobalConstantFP(CFP, AddrSpace);
    return;
  } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
    // Small integers are handled below; large integers are handled here.
    if (Size > 4) {
      EmitGlobalConstantLargeInt(CI, AddrSpace);
      return;
    }
  } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
    EmitGlobalConstantVector(CP);
    return;
  }

  printDataDirective(type, AddrSpace);
  EmitConstantValueOnly(CV);
  if (VerboseAsm) {
    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
      SmallString<40> S;
      CI->getValue().toStringUnsigned(S, 16);
      O.PadToColumn(TAI->getCommentColumn());
      O << TAI->getCommentString() << " 0x" << S.c_str();
    }
  }
  O << '\n';
}

void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
  // Target doesn't support this yet!
  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
}

/// PrintSpecial - Print information related to the specified machine instr
/// that is independent of the operand, and may be independent of the instr
/// itself.  This can be useful for portably encoding the comment character
/// or other bits of target-specific knowledge into the asmstrings.  The
/// syntax used is ${:comment}.  Targets can override this to add support
/// for their own strange codes.
void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
  if (!strcmp(Code, "private")) {
    O << TAI->getPrivateGlobalPrefix();
  } else if (!strcmp(Code, "comment")) {
    if (VerboseAsm)
      O << TAI->getCommentString();
  } else if (!strcmp(Code, "uid")) {
    // Comparing the address of MI isn't sufficient, because machineinstrs may
    // be allocated to the same address across functions.
    const Function *ThisF = MI->getParent()->getParent()->getFunction();
    
    // If this is a new LastFn instruction, bump the counter.
    if (LastMI != MI || LastFn != ThisF) {
      ++Counter;
      LastMI = MI;
      LastFn = ThisF;
    }
    O << Counter;
  } else {
    std::string msg;
    raw_string_ostream Msg(msg);
    Msg << "Unknown special formatter '" << Code
         << "' for machine instr: " << *MI;
    llvm_report_error(Msg.str());
  }    
}

/// processDebugLoc - Processes the debug information of each machine
/// instruction's DebugLoc.
void AsmPrinter::processDebugLoc(DebugLoc DL) {
  if (!TAI || !DW)
    return;
  
  if (TAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
    if (!DL.isUnknown()) {
      DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);

      if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT)
        printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
                                        DICompileUnit(CurDLT.CompileUnit)));

      PrevDLT = CurDLT;
    }
  }
}

/// printInlineAsm - This method formats and prints the specified machine
/// instruction that is an inline asm.
void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
  unsigned NumOperands = MI->getNumOperands();
  
  // Count the number of register definitions.
  unsigned NumDefs = 0;
  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
       ++NumDefs)
    assert(NumDefs != NumOperands-1 && "No asm string?");
  
  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");

  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();

  // If this asmstr is empty, just print the #APP/#NOAPP markers.
  // These are useful to see where empty asm's wound up.
  if (AsmStr[0] == 0) {
    O << TAI->getCommentString() << TAI->getInlineAsmStart() << "\n\t";
    O << TAI->getCommentString() << TAI->getInlineAsmEnd() << '\n';
    return;
  }
  
  O << TAI->getCommentString() << TAI->getInlineAsmStart() << "\n\t";

  // The variant of the current asmprinter.
  int AsmPrinterVariant = TAI->getAssemblerDialect();

  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
  const char *LastEmitted = AsmStr; // One past the last character emitted.
  
  while (*LastEmitted) {
    switch (*LastEmitted) {
    default: {
      // Not a special case, emit the string section literally.
      const char *LiteralEnd = LastEmitted+1;
      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
        ++LiteralEnd;
      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
        O.write(LastEmitted, LiteralEnd-LastEmitted);
      LastEmitted = LiteralEnd;
      break;
    }
    case '\n':
      ++LastEmitted;   // Consume newline character.
      O << '\n';       // Indent code with newline.
      break;
    case '$': {
      ++LastEmitted;   // Consume '$' character.
      bool Done = true;

      // Handle escapes.
      switch (*LastEmitted) {
      default: Done = false; break;
      case '$':     // $$ -> $
        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
          O << '$';
        ++LastEmitted;  // Consume second '$' character.
        break;
      case '(':             // $( -> same as GCC's { character.
        ++LastEmitted;      // Consume '(' character.
        if (CurVariant != -1) {
          llvm_report_error("Nested variants found in inline asm string: '"
                            + std::string(AsmStr) + "'");
        }
        CurVariant = 0;     // We're in the first variant now.
        break;
      case '|':
        ++LastEmitted;  // consume '|' character.
        if (CurVariant == -1)
          O << '|';       // this is gcc's behavior for | outside a variant
        else
          ++CurVariant;   // We're in the next variant.
        break;
      case ')':         // $) -> same as GCC's } char.
        ++LastEmitted;  // consume ')' character.
        if (CurVariant == -1)
          O << '}';     // this is gcc's behavior for } outside a variant
        else 
          CurVariant = -1;
        break;
      }
      if (Done) break;
      
      bool HasCurlyBraces = false;
      if (*LastEmitted == '{') {     // ${variable}
        ++LastEmitted;               // Consume '{' character.
        HasCurlyBraces = true;
      }
      
      // If we have ${:foo}, then this is not a real operand reference, it is a
      // "magic" string reference, just like in .td files.  Arrange to call
      // PrintSpecial.
      if (HasCurlyBraces && *LastEmitted == ':') {
        ++LastEmitted;
        const char *StrStart = LastEmitted;
        const char *StrEnd = strchr(StrStart, '}');
        if (StrEnd == 0) {
          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '" 
                            + std::string(AsmStr) + "'");
        }
        
        std::string Val(StrStart, StrEnd);
        PrintSpecial(MI, Val.c_str());
        LastEmitted = StrEnd+1;
        break;
      }
            
      const char *IDStart = LastEmitted;
      char *IDEnd;
      errno = 0;
      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
        llvm_report_error("Bad $ operand number in inline asm string: '" 
                          + std::string(AsmStr) + "'");
      }
      LastEmitted = IDEnd;
      
      char Modifier[2] = { 0, 0 };
      
      if (HasCurlyBraces) {
        // If we have curly braces, check for a modifier character.  This
        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
        if (*LastEmitted == ':') {
          ++LastEmitted;    // Consume ':' character.
          if (*LastEmitted == 0) {
            llvm_report_error("Bad ${:} expression in inline asm string: '" 
                              + std::string(AsmStr) + "'");
          }
          
          Modifier[0] = *LastEmitted;
          ++LastEmitted;    // Consume modifier character.
        }
        
        if (*LastEmitted != '}') {
          llvm_report_error("Bad ${} expression in inline asm string: '" 
                            + std::string(AsmStr) + "'");
        }
        ++LastEmitted;    // Consume '}' character.
      }
      
      if ((unsigned)Val >= NumOperands-1) {
        llvm_report_error("Invalid $ operand number in inline asm string: '" 
                          + std::string(AsmStr) + "'");
      }
      
      // Okay, we finally have a value number.  Ask the target to print this
      // operand!
      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
        unsigned OpNo = 1;

        bool Error = false;

        // Scan to find the machine operand number for the operand.
        for (; Val; --Val) {
          if (OpNo >= MI->getNumOperands()) break;
          unsigned OpFlags = MI->getOperand(OpNo).getImm();
          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
        }

        if (OpNo >= MI->getNumOperands()) {
          Error = true;
        } else {
          unsigned OpFlags = MI->getOperand(OpNo).getImm();
          ++OpNo;  // Skip over the ID number.

          if (Modifier[0]=='l')  // labels are target independent
            printBasicBlockLabel(MI->getOperand(OpNo).getMBB(), 
                                 false, false, false);
          else {
            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
            if ((OpFlags & 7) == 4) {
              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
                                                Modifier[0] ? Modifier : 0);
            } else {
              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
                                          Modifier[0] ? Modifier : 0);
            }
          }
        }
        if (Error) {
          std::string msg;
          raw_string_ostream Msg(msg);
          Msg << "Invalid operand found in inline asm: '"
               << AsmStr << "'\n";
          MI->print(Msg);
          llvm_report_error(Msg.str());
        }
      }
      break;
    }
    }
  }
  O << "\n\t" << TAI->getCommentString() << TAI->getInlineAsmEnd() << '\n';
}

/// printImplicitDef - This method prints the specified machine instruction
/// that is an implicit def.
void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
  if (VerboseAsm) {
    O.PadToColumn(TAI->getCommentColumn());
    O << TAI->getCommentString() << " implicit-def: "
      << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n';
  }
}

/// printLabel - This method prints a local label used by debug and
/// exception handling tables.
void AsmPrinter::printLabel(const MachineInstr *MI) const {
  printLabel(MI->getOperand(0).getImm());
}

void AsmPrinter::printLabel(unsigned Id) const {
  O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n";
}

/// printDeclare - This method prints a local variable declaration used by
/// debug tables.
/// FIXME: It doesn't really print anything rather it inserts a DebugVariable
/// entry into dwarf table.
void AsmPrinter::printDeclare(const MachineInstr *MI) const {
  unsigned FI = MI->getOperand(0).getIndex();
  GlobalValue *GV = MI->getOperand(1).getGlobal();
  DW->RecordVariable(cast<GlobalVariable>(GV), FI, MI);
}

/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
/// instruction, using the specified assembler variant.  Targets should
/// overried this to format as appropriate.
bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
                                 unsigned AsmVariant, const char *ExtraCode) {
  // Target doesn't support this yet!
  return true;
}

bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
                                       unsigned AsmVariant,
                                       const char *ExtraCode) {
  // Target doesn't support this yet!
  return true;
}

/// printBasicBlockLabel - This method prints the label for the specified
/// MachineBasicBlock
void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
                                      bool printAlign, 
                                      bool printColon,
                                      bool printComment) const {
  if (printAlign) {
    unsigned Align = MBB->getAlignment();
    if (Align)
      EmitAlignment(Log2_32(Align));
  }

  O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_'
    << MBB->getNumber();
  if (printColon)
    O << ':';
  if (printComment) {
    if (const BasicBlock *BB = MBB->getBasicBlock())
      if (BB->hasName()) {
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString() << ' ';
        WriteAsOperand(O, BB, /*PrintType=*/false);
      }

    if (printColon)
      EmitComments(*MBB);
  }
}

/// printPICJumpTableSetLabel - This method prints a set label for the
/// specified MachineBasicBlock for a jumptable entry.
void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 
                                           const MachineBasicBlock *MBB) const {
  if (!TAI->getSetDirective())
    return;
  
  O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
  printBasicBlockLabel(MBB, false, false, false);
  O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 
    << '_' << uid << '\n';
}

void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
                                           const MachineBasicBlock *MBB) const {
  if (!TAI->getSetDirective())
    return;
  
  O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
    << getFunctionNumber() << '_' << uid << '_' << uid2
    << "_set_" << MBB->getNumber() << ',';
  printBasicBlockLabel(MBB, false, false, false);
  O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 
    << '_' << uid << '_' << uid2 << '\n';
}

/// printDataDirective - This method prints the asm directive for the
/// specified type.
void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
  const TargetData *TD = TM.getTargetData();
  switch (type->getTypeID()) {
  case Type::FloatTyID: case Type::DoubleTyID:
  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
    assert(0 && "Should have already output floating point constant.");
  default:
    assert(0 && "Can't handle printing this type of thing");
  case Type::IntegerTyID: {
    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
    if (BitWidth <= 8)
      O << TAI->getData8bitsDirective(AddrSpace);
    else if (BitWidth <= 16)
      O << TAI->getData16bitsDirective(AddrSpace);
    else if (BitWidth <= 32)
      O << TAI->getData32bitsDirective(AddrSpace);
    else if (BitWidth <= 64) {
      assert(TAI->getData64bitsDirective(AddrSpace) &&
             "Target cannot handle 64-bit constant exprs!");
      O << TAI->getData64bitsDirective(AddrSpace);
    } else {
      llvm_unreachable("Target cannot handle given data directive width!");
    }
    break;
  }
  case Type::PointerTyID:
    if (TD->getPointerSize() == 8) {
      assert(TAI->getData64bitsDirective(AddrSpace) &&
             "Target cannot handle 64-bit pointer exprs!");
      O << TAI->getData64bitsDirective(AddrSpace);
    } else if (TD->getPointerSize() == 2) {
      O << TAI->getData16bitsDirective(AddrSpace);
    } else if (TD->getPointerSize() == 1) {
      O << TAI->getData8bitsDirective(AddrSpace);
    } else {
      O << TAI->getData32bitsDirective(AddrSpace);
    }
    break;
  }
}

void AsmPrinter::printVisibility(const std::string& Name,
                                 unsigned Visibility) const {
  if (Visibility == GlobalValue::HiddenVisibility) {
    if (const char *Directive = TAI->getHiddenDirective())
      O << Directive << Name << '\n';
  } else if (Visibility == GlobalValue::ProtectedVisibility) {
    if (const char *Directive = TAI->getProtectedDirective())
      O << Directive << Name << '\n';
  }
}

void AsmPrinter::printOffset(int64_t Offset) const {
  if (Offset > 0)
    O << '+' << Offset;
  else if (Offset < 0)
    O << Offset;
}

void AsmPrinter::printMCInst(const MCInst *MI) {
  llvm_unreachable("MCInst printing unavailable on this target!");
}

GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
  if (!S->usesMetadata())
    return 0;
  
  gcp_iterator GCPI = GCMetadataPrinters.find(S);
  if (GCPI != GCMetadataPrinters.end())
    return GCPI->second;
  
  const char *Name = S->getName().c_str();
  
  for (GCMetadataPrinterRegistry::iterator
         I = GCMetadataPrinterRegistry::begin(),
         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
    if (strcmp(Name, I->getName()) == 0) {
      GCMetadataPrinter *GMP = I->instantiate();
      GMP->S = S;
      GCMetadataPrinters.insert(std::make_pair(S, GMP));
      return GMP;
    }
  
  cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n";
  llvm_unreachable(0);
}

/// EmitComments - Pretty-print comments for instructions
void AsmPrinter::EmitComments(const MachineInstr &MI) const {
  if (!VerboseAsm ||
      MI.getDebugLoc().isUnknown())
    return;
  
  DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());

  // Print source line info.
  O.PadToColumn(TAI->getCommentColumn());
  O << TAI->getCommentString() << " SrcLine ";
  if (DLT.CompileUnit->hasInitializer()) {
    Constant *Name = DLT.CompileUnit->getInitializer();
    if (ConstantArray *NameString = dyn_cast<ConstantArray>(Name))
      if (NameString->isString())
        O << NameString->getAsString() << " ";
  }
  O << DLT.Line;
  if (DLT.Col != 0) 
    O << ":" << DLT.Col;
}

/// EmitComments - Pretty-print comments for instructions
void AsmPrinter::EmitComments(const MCInst &MI) const
{
  if (VerboseAsm) {
    if (!MI.getDebugLoc().isUnknown()) {
      DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());

      // Print source line info
      O.PadToColumn(TAI->getCommentColumn());
      O << TAI->getCommentString() << " SrcLine ";
      if (DLT.CompileUnit->hasInitializer()) {
        Constant *Name = DLT.CompileUnit->getInitializer();
        if (ConstantArray *NameString = dyn_cast<ConstantArray>(Name))
          if (NameString->isString()) {
            O << NameString->getAsString() << " ";
          }
      }
      O << DLT.Line;
      if (DLT.Col != 0) 
        O << ":" << DLT.Col;
    }
  }
}

/// Indent - Insert spaces into the character output stream.  The
/// "level" is multiplied by the "scale" to calculate the number of
/// spaces to insert.  "level" can represent something like loop
/// nesting level, for example.
///
static formatted_raw_ostream &
Indent(formatted_raw_ostream &out, int level, int scale = 2) {
  for(int i = 0; i < level*scale; ++i) {
    out << " ";
  }
  return out;
}

/// PrintChildLoopComment - Print comments about child loops within
/// the loop for this basic block, with nesting.
///
static void PrintChildLoopComment(formatted_raw_ostream &O,
                                  const MachineLoop *loop,
                                  const TargetAsmInfo *TAI,
                                  int FunctionNumber) {
  // Add child loop information
  for(MachineLoop::iterator cl = loop->begin(),
        clend = loop->end();
      cl != clend;
      ++cl) {
    MachineBasicBlock *Header = (*cl)->getHeader();
    assert(Header && "No header for loop");

    O << '\n';
    O.PadToColumn(TAI->getCommentColumn());

    O << TAI->getCommentString();
    Indent(O, (*cl)->getLoopDepth()-1)
      << " Child Loop BB" << FunctionNumber << "_"
      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();

    PrintChildLoopComment(O, *cl, TAI, FunctionNumber);
  }
}

/// EmitComments - Pretty-print comments for basic blocks
void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const
{
  if (VerboseAsm) {
    // Add loop depth information
    const MachineLoop *loop = LI->getLoopFor(&MBB);

    if (loop) {
      // Print a newline after bb# annotation.
      O << "\n";
      O.PadToColumn(TAI->getCommentColumn());
      O << TAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
        << '\n';

      O.PadToColumn(TAI->getCommentColumn());

      MachineBasicBlock *Header = loop->getHeader();
      assert(Header && "No header for loop");
      
      if (Header == &MBB) {
        O << TAI->getCommentString() << " Loop Header";
        PrintChildLoopComment(O, loop, TAI, getFunctionNumber());
      }
      else {
        O << TAI->getCommentString() << " Loop Header is BB"
          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
      }

      if (loop->empty()) {
        O << '\n';
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString() << " Inner Loop";
      }

      // Add parent loop information
      for (const MachineLoop *CurLoop = loop->getParentLoop();
           CurLoop;
           CurLoop = CurLoop->getParentLoop()) {
        MachineBasicBlock *Header = CurLoop->getHeader();
        assert(Header && "No header for loop");

        O << '\n';
        O.PadToColumn(TAI->getCommentColumn());
        O << TAI->getCommentString();
        Indent(O, CurLoop->getLoopDepth()-1)
          << " Inside Loop BB" << getFunctionNumber() << "_"
          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
      }
    }
  }
}