llvm/lib/VMCore/AsmWriter.cpp - toolchain/llvm-project - Gitiles

 //===-- Writer.cpp - Library for Printing VM assembly files ------*- C++ -*--=//
 //
 // This library implements the functionality defined in llvm/Assembly/Writer.h
 //
 // This library uses the Analysis library to figure out offsets for
 // variables in the method tables...
 //
 // TODO: print out the type name instead of the full type if a particular type
 //       is in the symbol table...
 //
 //===----------------------------------------------------------------------===//

 #include "llvm/Assembly/Writer.h"
 #include "llvm/Analysis/SlotCalculator.h"
 #include "llvm/Module.h"
 #include "llvm/Method.h"
 #include "llvm/GlobalVariable.h"
 #include "llvm/BasicBlock.h"
 #include "llvm/ConstPoolVals.h"
 #include "llvm/iOther.h"
 #include "llvm/iMemory.h"
 #include "llvm/Support/STLExtras.h"
 #include "llvm/SymbolTable.h"
 #include <algorithm>

 // WriteAsOperand - Write the name of the specified value out to the specified
 // ostream.  This can be useful when you just want to print int %reg126, not the
 // whole instruction that generated it.
 //
 ostream &WriteAsOperand(ostream &Out, const Value *V, bool PrintType,
 			bool PrintName, SlotCalculator *Table) {
   if (PrintType)
     Out << " " << V->getType();

   if (PrintName && V->hasName()) {
     Out << " %" << V->getName();
   } else {
     if (const ConstPoolVal *CPV = dyn_cast<const ConstPoolVal>(V)) {
       Out << " " << CPV->getStrValue();
     } else {
       int Slot;
       if (Table) {
 	Slot = Table->getValSlot(V);
       } else {
 	if (const Type *Ty = dyn_cast<const Type>(V)) {
 	  return Out << " " << Ty;
 	} else if (const MethodArgument *MA =dyn_cast<const MethodArgument>(V)){
 	  Table = new SlotCalculator(MA->getParent(), true);
 	} else if (const Instruction *I = dyn_cast<const Instruction>(V)) {
 	  Table = new SlotCalculator(I->getParent()->getParent(), true);
 	} else if (const BasicBlock *BB = dyn_cast<const BasicBlock>(V)) {
 	  Table = new SlotCalculator(BB->getParent(), true);
 	} else if (const Method *Meth = dyn_cast<const Method>(V)) {
 	  Table = new SlotCalculator(Meth, true);
 	} else if (const Module *Mod  = dyn_cast<const Module>(V)) {
 	  Table = new SlotCalculator(Mod, true);
 	} else {
 	  return Out << "BAD VALUE TYPE!";
 	}
 	Slot = Table->getValSlot(V);
 	delete Table;
       }
       if (Slot >= 0)  Out << " %" << Slot;
       else if (PrintName)
         Out << "<badref>";     // Not embeded into a location?
     }
   }
   return Out;
 }


 class AssemblyWriter {
   ostream &Out;
   SlotCalculator &Table;
 public:
   inline AssemblyWriter(ostream &o, SlotCalculator &Tab) : Out(o), Table(Tab) {
   }

   inline void write(const Module *M)         { processModule(M);      }
   inline void write(const GlobalVariable *G) { processGlobal(G);      }
   inline void write(const Method *M)         { processMethod(M);      }
   inline void write(const BasicBlock *BB)    { processBasicBlock(BB); }
   inline void write(const Instruction *I)    { processInstruction(I); }
   inline void write(const ConstPoolVal *CPV) { processConstant(CPV);  }

 private :
   void processModule(const Module *M);
   void processSymbolTable(const SymbolTable &ST);
   void processConstant(const ConstPoolVal *CPV);
   void processGlobal(const GlobalVariable *GV);
   void processMethod(const Method *M);
   void processMethodArgument(const MethodArgument *MA);
   void processBasicBlock(const BasicBlock *BB);
   void processInstruction(const Instruction *I);

   void writeOperand(const Value *Op, bool PrintType, bool PrintName = true);
 };


 void AssemblyWriter::writeOperand(const Value *Operand, bool PrintType,
 				  bool PrintName) {
   WriteAsOperand(Out, Operand, PrintType, PrintName, &Table);
 }


 void AssemblyWriter::processModule(const Module *M) {
   // Loop over the symbol table, emitting all named constants...
   if (M->hasSymbolTable())
     processSymbolTable(*M->getSymbolTable());

   for_each(M->gbegin(), M->gend(),
 	   bind_obj(this, &AssemblyWriter::processGlobal));

   Out << "implementation\n";

   // Output all of the methods...
   for_each(M->begin(), M->end(), bind_obj(this,&AssemblyWriter::processMethod));
 }

 void AssemblyWriter::processGlobal(const GlobalVariable *GV) {
   if (GV->hasName()) Out << "%" << GV->getName() << " = ";

   if (!GV->hasInitializer()) Out << "uninitialized ";

   Out << (GV->isConstant() ? "constant " : "global ")
       << GV->getType()->getValueType()->getDescription();

   if (GV->hasInitializer())
     writeOperand(GV->getInitializer(), false, false);

   Out << endl;
 }


 // processSymbolTable - Run through symbol table looking for named constants
 // if a named constant is found, emit it's declaration...
 //
 void AssemblyWriter::processSymbolTable(const SymbolTable &ST) {
   for (SymbolTable::const_iterator TI = ST.begin(); TI != ST.end(); ++TI) {
     SymbolTable::type_const_iterator I = ST.type_begin(TI->first);
     SymbolTable::type_const_iterator End = ST.type_end(TI->first);

     for (; I != End; ++I) {
       const Value *V = I->second;
       if (const ConstPoolVal *CPV = dyn_cast<const ConstPoolVal>(V)) {
 	processConstant(CPV);
       } else if (const Type *Ty = dyn_cast<const Type>(V)) {
 	Out << "\t%" << I->first << " = type " << Ty->getDescription() << endl;
       }
     }
   }
 }


 // processConstant - Print out a constant pool entry...
 //
 void AssemblyWriter::processConstant(const ConstPoolVal *CPV) {
   // Don't print out unnamed constants, they will be inlined
   if (!CPV->hasName()) return;

   // Print out name...
   Out << "\t%" << CPV->getName() << " = ";

   // Print out the constant type...
   Out << CPV->getType();

   // Write the value out now...
   writeOperand(CPV, false, false);

   if (!CPV->hasName() && CPV->getType() != Type::VoidTy) {
     int Slot = Table.getValSlot(CPV); // Print out the def slot taken...
     Out << "\t\t; <" << CPV->getType() << ">:";
     if (Slot >= 0) Out << Slot;
     else Out << "<badref>";
   }

   Out << endl;
 }

 // processMethod - Process all aspects of a method.
 //
 void AssemblyWriter::processMethod(const Method *M) {
   // Print out the return type and name...
   Out << "\n" << (M->isExternal() ? "declare " : "")
       << M->getReturnType() << " \"" << M->getName() << "\"(";
   Table.incorporateMethod(M);

   // Loop over the arguments, processing them...
   for_each(M->getArgumentList().begin(), M->getArgumentList().end(),
 	   bind_obj(this, &AssemblyWriter::processMethodArgument));


   // Finish printing arguments...
   const MethodType *MT = cast<const MethodType>(M->getMethodType());
   if (MT->isVarArg()) {
     if (MT->getParamTypes().size()) Out << ", ";
     Out << "...";  // Output varargs portion of signature!
   }
   Out << ")\n";

   if (!M->isExternal()) {
     // Loop over the symbol table, emitting all named constants...
     if (M->hasSymbolTable())
       processSymbolTable(*M->getSymbolTable());

     Out << "begin";

     // Output all of its basic blocks... for the method
     for_each(M->begin(), M->end(),
 	     bind_obj(this, &AssemblyWriter::processBasicBlock));

     Out << "end\n";
   }

   Table.purgeMethod();
 }

 // processMethodArgument - This member is called for every argument that
 // is passed into the method.  Simply print it out
 //
 void AssemblyWriter::processMethodArgument(const MethodArgument *Arg) {
   // Insert commas as we go... the first arg doesn't get a comma
   if (Arg != Arg->getParent()->getArgumentList().front()) Out << ", ";

   // Output type...
   Out << Arg->getType();

   // Output name, if available...
   if (Arg->hasName())
     Out << " %" << Arg->getName();
   else if (Table.getValSlot(Arg) < 0)
     Out << "<badref>";
 }

 // processBasicBlock - This member is called for each basic block in a methd.
 //
 void AssemblyWriter::processBasicBlock(const BasicBlock *BB) {
   if (BB->hasName()) {              // Print out the label if it exists...
     Out << "\n" << BB->getName() << ":";
   } else {
     int Slot = Table.getValSlot(BB);
     Out << "\n; <label>:";
     if (Slot >= 0)
       Out << Slot;         // Extra newline seperates out label's
     else
       Out << "<badref>";
   }
   Out << "\t\t\t\t\t;[#uses=" << BB->use_size() << "]\n";  // Output # uses

   // Output all of the instructions in the basic block...
   for_each(BB->begin(), BB->end(),
 	   bind_obj(this, &AssemblyWriter::processInstruction));
 }

 // processInstruction - This member is called for each Instruction in a methd.
 //
 void AssemblyWriter::processInstruction(const Instruction *I) {
   Out << "\t";

   // Print out name if it exists...
   if (I && I->hasName())
     Out << "%" << I->getName() << " = ";

   // Print out the opcode...
   Out << I->getOpcodeName();

   // Print out the type of the operands...
   const Value *Operand = I->getNumOperands() ? I->getOperand(0) : 0;

   // Special case conditional branches to swizzle the condition out to the front
   if (I->getOpcode() == Instruction::Br && I->getNumOperands() > 1) {
     writeOperand(I->getOperand(2), true);
     Out << ",";
     writeOperand(Operand, true);
     Out << ",";
     writeOperand(I->getOperand(1), true);

   } else if (I->getOpcode() == Instruction::Switch) {
     // Special case switch statement to get formatting nice and correct...
     writeOperand(Operand         , true); Out << ",";
     writeOperand(I->getOperand(1), true); Out << " [";

     for (unsigned op = 2, Eop = I->getNumOperands(); op < Eop; op += 2) {
       Out << "\n\t\t";
       writeOperand(I->getOperand(op  ), true); Out << ",";
       writeOperand(I->getOperand(op+1), true);
     }
     Out << "\n\t]";
   } else if (isa<PHINode>(I)) {
     Out << " " << Operand->getType();

     Out << " [";  writeOperand(Operand, false); Out << ",";
     writeOperand(I->getOperand(1), false); Out << " ]";
     for (unsigned op = 2, Eop = I->getNumOperands(); op < Eop; op += 2) {
       Out << ", [";
       writeOperand(I->getOperand(op  ), false); Out << ",";
       writeOperand(I->getOperand(op+1), false); Out << " ]";
     }
   } else if (I->getOpcode() == Instruction::Ret && !Operand) {
     Out << " void";
   } else if (I->getOpcode() == Instruction::Call) {
     // TODO: Should try to print out short form of the Call instruction
     writeOperand(Operand, true);
     Out << "(";
     if (I->getNumOperands() > 1) writeOperand(I->getOperand(1), true);
     for (unsigned op = 2, Eop = I->getNumOperands(); op < Eop; ++op) {
       Out << ",";
       writeOperand(I->getOperand(op), true);
     }

     Out << " )";
   } else if (I->getOpcode() == Instruction::Malloc ||
 	     I->getOpcode() == Instruction::Alloca) {
     Out << " " << cast<const PointerType>(I->getType())->getValueType();
     if (I->getNumOperands()) {
       Out << ",";
       writeOperand(I->getOperand(0), true);
     }
   } else if (I->getOpcode() == Instruction::Cast) {
     writeOperand(Operand, true);
     Out << " to " << I->getType();
   } else if (Operand) {   // Print the normal way...

     // PrintAllTypes - Instructions who have operands of all the same type
     // omit the type from all but the first operand.  If the instruction has
     // different type operands (for example br), then they are all printed.
     bool PrintAllTypes = false;
     const Type *TheType = Operand->getType();

     for (unsigned i = 1, E = I->getNumOperands(); i != E; ++i) {
       Operand = I->getOperand(i);
       if (Operand->getType() != TheType) {
 	PrintAllTypes = true;       // We have differing types!  Print them all!
 	break;
       }
     }

     if (!PrintAllTypes)
       Out << " " << I->getOperand(0)->getType();

     for (unsigned i = 0, E = I->getNumOperands(); i != E; ++i) {
       if (i) Out << ",";
       writeOperand(I->getOperand(i), PrintAllTypes);
     }
   }

   // Print a little comment after the instruction indicating which slot it
   // occupies.
   //
   if (I->getType() != Type::VoidTy) {
     Out << "\t\t; <" << I->getType() << ">";

     if (!I->hasName()) {
       int Slot = Table.getValSlot(I); // Print out the def slot taken...
       if (Slot >= 0) Out << ":" << Slot;
       else Out << ":<badref>";
     }
     Out << "\t[#uses=" << I->use_size() << "]";  // Output # uses
   }
   Out << endl;
 }


 //===----------------------------------------------------------------------===//
 //                       External Interface declarations
 //===----------------------------------------------------------------------===//


 void WriteToAssembly(const Module *M, ostream &o) {
   if (M == 0) { o << "<null> module\n"; return; }
   SlotCalculator SlotTable(M, true);
   AssemblyWriter W(o, SlotTable);

   W.write(M);
 }

 void WriteToAssembly(const GlobalVariable *G, ostream &o) {
   if (G == 0) { o << "<null> global variable\n"; return; }
   SlotCalculator SlotTable(G->getParent(), true);
   AssemblyWriter W(o, SlotTable);
   W.write(G);
 }

 void WriteToAssembly(const Method *M, ostream &o) {
   if (M == 0) { o << "<null> method\n"; return; }
   SlotCalculator SlotTable(M->getParent(), true);
   AssemblyWriter W(o, SlotTable);

   W.write(M);
 }


 void WriteToAssembly(const BasicBlock *BB, ostream &o) {
   if (BB == 0) { o << "<null> basic block\n"; return; }

   SlotCalculator SlotTable(BB->getParent(), true);
   AssemblyWriter W(o, SlotTable);

   W.write(BB);
 }

 void WriteToAssembly(const ConstPoolVal *CPV, ostream &o) {
   if (CPV == 0) { o << "<null> constant pool value\n"; return; }
   WriteAsOperand(o, CPV, true, true, 0);
 }

 void WriteToAssembly(const Instruction *I, ostream &o) {
   if (I == 0) { o << "<null> instruction\n"; return; }

   SlotCalculator SlotTable(I->getParent() ? I->getParent()->getParent() : 0,
 			   true);
   AssemblyWriter W(o, SlotTable);

   W.write(I);
 }
	//===-- Writer.cpp - Library for Printing VM assembly files ------- C++ ---=//
	//
	// This library implements the functionality defined in llvm/Assembly/Writer.h
	//
	// This library uses the Analysis library to figure out offsets for
	// variables in the method tables...
	//
	// TODO: print out the type name instead of the full type if a particular type
	// is in the symbol table...
	//
	//===----------------------------------------------------------------------===//

	#include "llvm/Assembly/Writer.h"
	#include "llvm/Analysis/SlotCalculator.h"
	#include "llvm/Module.h"
	#include "llvm/Method.h"
	#include "llvm/GlobalVariable.h"
	#include "llvm/BasicBlock.h"
	#include "llvm/ConstPoolVals.h"
	#include "llvm/iOther.h"
	#include "llvm/iMemory.h"
	#include "llvm/Support/STLExtras.h"
	#include "llvm/SymbolTable.h"
	#include <algorithm>

	// WriteAsOperand - Write the name of the specified value out to the specified
	// ostream. This can be useful when you just want to print int %reg126, not the
	// whole instruction that generated it.
	//
	ostream &WriteAsOperand(ostream &Out, const Value *V, bool PrintType,
	bool PrintName, SlotCalculator *Table) {
	if (PrintType)
	Out << " " << V->getType();

	if (PrintName && V->hasName()) {
	Out << " %" << V->getName();
	} else {
	if (const ConstPoolVal *CPV = dyn_cast<const ConstPoolVal>(V)) {
	Out << " " << CPV->getStrValue();
	} else {
	int Slot;
	if (Table) {
	Slot = Table->getValSlot(V);
	} else {
	if (const Type *Ty = dyn_cast<const Type>(V)) {
	return Out << " " << Ty;
	} else if (const MethodArgument *MA =dyn_cast<const MethodArgument>(V)){
	Table = new SlotCalculator(MA->getParent(), true);
	} else if (const Instruction *I = dyn_cast<const Instruction>(V)) {
	Table = new SlotCalculator(I->getParent()->getParent(), true);
	} else if (const BasicBlock *BB = dyn_cast<const BasicBlock>(V)) {
	Table = new SlotCalculator(BB->getParent(), true);
	} else if (const Method *Meth = dyn_cast<const Method>(V)) {
	Table = new SlotCalculator(Meth, true);
	} else if (const Module *Mod = dyn_cast<const Module>(V)) {
	Table = new SlotCalculator(Mod, true);
	} else {
	return Out << "BAD VALUE TYPE!";
	}
	Slot = Table->getValSlot(V);
	delete Table;
	}
	if (Slot >= 0) Out << " %" << Slot;
	else if (PrintName)
	Out << "<badref>"; // Not embeded into a location?
	}
	}
	return Out;
	}



	class AssemblyWriter {
	ostream &Out;
	SlotCalculator &Table;
	public:
	inline AssemblyWriter(ostream &o, SlotCalculator &Tab) : Out(o), Table(Tab) {
	}

	inline void write(const Module *M) { processModule(M); }
	inline void write(const GlobalVariable *G) { processGlobal(G); }
	inline void write(const Method *M) { processMethod(M); }
	inline void write(const BasicBlock *BB) { processBasicBlock(BB); }
	inline void write(const Instruction *I) { processInstruction(I); }
	inline void write(const ConstPoolVal *CPV) { processConstant(CPV); }

	private :
	void processModule(const Module *M);
	void processSymbolTable(const SymbolTable &ST);
	void processConstant(const ConstPoolVal *CPV);
	void processGlobal(const GlobalVariable *GV);
	void processMethod(const Method *M);
	void processMethodArgument(const MethodArgument *MA);
	void processBasicBlock(const BasicBlock *BB);
	void processInstruction(const Instruction *I);

	void writeOperand(const Value *Op, bool PrintType, bool PrintName = true);
	};


	void AssemblyWriter::writeOperand(const Value *Operand, bool PrintType,
	bool PrintName) {
	WriteAsOperand(Out, Operand, PrintType, PrintName, &Table);
	}


	void AssemblyWriter::processModule(const Module *M) {
	// Loop over the symbol table, emitting all named constants...
	if (M->hasSymbolTable())
	processSymbolTable(*M->getSymbolTable());

	for_each(M->gbegin(), M->gend(),
	bind_obj(this, &AssemblyWriter::processGlobal));

	Out << "implementation\n";

	// Output all of the methods...
	for_each(M->begin(), M->end(), bind_obj(this,&AssemblyWriter::processMethod));
	}

	void AssemblyWriter::processGlobal(const GlobalVariable *GV) {
	if (GV->hasName()) Out << "%" << GV->getName() << " = ";

	if (!GV->hasInitializer()) Out << "uninitialized ";

	Out << (GV->isConstant() ? "constant " : "global ")
	<< GV->getType()->getValueType()->getDescription();

	if (GV->hasInitializer())
	writeOperand(GV->getInitializer(), false, false);

	Out << endl;
	}


	// processSymbolTable - Run through symbol table looking for named constants
	// if a named constant is found, emit it's declaration...
	//
	void AssemblyWriter::processSymbolTable(const SymbolTable &ST) {
	for (SymbolTable::const_iterator TI = ST.begin(); TI != ST.end(); ++TI) {
	SymbolTable::type_const_iterator I = ST.type_begin(TI->first);
	SymbolTable::type_const_iterator End = ST.type_end(TI->first);

	for (; I != End; ++I) {
	const Value *V = I->second;
	if (const ConstPoolVal *CPV = dyn_cast<const ConstPoolVal>(V)) {
	processConstant(CPV);
	} else if (const Type *Ty = dyn_cast<const Type>(V)) {
	Out << "\t%" << I->first << " = type " << Ty->getDescription() << endl;
	}
	}
	}
	}


	// processConstant - Print out a constant pool entry...
	//
	void AssemblyWriter::processConstant(const ConstPoolVal *CPV) {
	// Don't print out unnamed constants, they will be inlined
	if (!CPV->hasName()) return;

	// Print out name...
	Out << "\t%" << CPV->getName() << " = ";

	// Print out the constant type...
	Out << CPV->getType();

	// Write the value out now...
	writeOperand(CPV, false, false);

	if (!CPV->hasName() && CPV->getType() != Type::VoidTy) {
	int Slot = Table.getValSlot(CPV); // Print out the def slot taken...
	Out << "\t\t; <" << CPV->getType() << ">:";
	if (Slot >= 0) Out << Slot;
	else Out << "<badref>";
	}

	Out << endl;
	}

	// processMethod - Process all aspects of a method.
	//
	void AssemblyWriter::processMethod(const Method *M) {
	// Print out the return type and name...
	Out << "\n" << (M->isExternal() ? "declare " : "")
	<< M->getReturnType() << " \"" << M->getName() << "\"(";
	Table.incorporateMethod(M);

	// Loop over the arguments, processing them...
	for_each(M->getArgumentList().begin(), M->getArgumentList().end(),
	bind_obj(this, &AssemblyWriter::processMethodArgument));


	// Finish printing arguments...
	const MethodType *MT = cast<const MethodType>(M->getMethodType());
	if (MT->isVarArg()) {
	if (MT->getParamTypes().size()) Out << ", ";
	Out << "..."; // Output varargs portion of signature!
	}
	Out << ")\n";

	if (!M->isExternal()) {
	// Loop over the symbol table, emitting all named constants...
	if (M->hasSymbolTable())
	processSymbolTable(*M->getSymbolTable());

	Out << "begin";

	// Output all of its basic blocks... for the method
	for_each(M->begin(), M->end(),
	bind_obj(this, &AssemblyWriter::processBasicBlock));

	Out << "end\n";
	}

	Table.purgeMethod();
	}

	// processMethodArgument - This member is called for every argument that
	// is passed into the method. Simply print it out
	//
	void AssemblyWriter::processMethodArgument(const MethodArgument *Arg) {
	// Insert commas as we go... the first arg doesn't get a comma
	if (Arg != Arg->getParent()->getArgumentList().front()) Out << ", ";

	// Output type...
	Out << Arg->getType();

	// Output name, if available...
	if (Arg->hasName())
	Out << " %" << Arg->getName();
	else if (Table.getValSlot(Arg) < 0)
	Out << "<badref>";
	}

	// processBasicBlock - This member is called for each basic block in a methd.
	//
	void AssemblyWriter::processBasicBlock(const BasicBlock *BB) {
	if (BB->hasName()) { // Print out the label if it exists...
	Out << "\n" << BB->getName() << ":";
	} else {
	int Slot = Table.getValSlot(BB);
	Out << "\n; <label>:";
	if (Slot >= 0)
	Out << Slot; // Extra newline seperates out label's
	else
	Out << "<badref>";
	}
	Out << "\t\t\t\t\t;[#uses=" << BB->use_size() << "]\n"; // Output # uses

	// Output all of the instructions in the basic block...
	for_each(BB->begin(), BB->end(),
	bind_obj(this, &AssemblyWriter::processInstruction));
	}

	// processInstruction - This member is called for each Instruction in a methd.
	//
	void AssemblyWriter::processInstruction(const Instruction *I) {
	Out << "\t";

	// Print out name if it exists...
	if (I && I->hasName())
	Out << "%" << I->getName() << " = ";

	// Print out the opcode...
	Out << I->getOpcodeName();

	// Print out the type of the operands...
	const Value *Operand = I->getNumOperands() ? I->getOperand(0) : 0;

	// Special case conditional branches to swizzle the condition out to the front
	if (I->getOpcode() == Instruction::Br && I->getNumOperands() > 1) {
	writeOperand(I->getOperand(2), true);
	Out << ",";
	writeOperand(Operand, true);
	Out << ",";
	writeOperand(I->getOperand(1), true);

	} else if (I->getOpcode() == Instruction::Switch) {
	// Special case switch statement to get formatting nice and correct...
	writeOperand(Operand , true); Out << ",";
	writeOperand(I->getOperand(1), true); Out << " [";

	for (unsigned op = 2, Eop = I->getNumOperands(); op < Eop; op += 2) {
	Out << "\n\t\t";
	writeOperand(I->getOperand(op ), true); Out << ",";
	writeOperand(I->getOperand(op+1), true);
	}
	Out << "\n\t]";
	} else if (isa<PHINode>(I)) {
	Out << " " << Operand->getType();

	Out << " ["; writeOperand(Operand, false); Out << ",";
	writeOperand(I->getOperand(1), false); Out << " ]";
	for (unsigned op = 2, Eop = I->getNumOperands(); op < Eop; op += 2) {
	Out << ", [";
	writeOperand(I->getOperand(op ), false); Out << ",";
	writeOperand(I->getOperand(op+1), false); Out << " ]";
	}
	} else if (I->getOpcode() == Instruction::Ret && !Operand) {
	Out << " void";
	} else if (I->getOpcode() == Instruction::Call) {
	// TODO: Should try to print out short form of the Call instruction
	writeOperand(Operand, true);
	Out << "(";
	if (I->getNumOperands() > 1) writeOperand(I->getOperand(1), true);
	for (unsigned op = 2, Eop = I->getNumOperands(); op < Eop; ++op) {
	Out << ",";
	writeOperand(I->getOperand(op), true);
	}

	Out << " )";
	} else if (I->getOpcode() == Instruction::Malloc \|\|
	I->getOpcode() == Instruction::Alloca) {
	Out << " " << cast<const PointerType>(I->getType())->getValueType();
	if (I->getNumOperands()) {
	Out << ",";
	writeOperand(I->getOperand(0), true);
	}
	} else if (I->getOpcode() == Instruction::Cast) {
	writeOperand(Operand, true);
	Out << " to " << I->getType();
	} else if (Operand) { // Print the normal way...

	// PrintAllTypes - Instructions who have operands of all the same type
	// omit the type from all but the first operand. If the instruction has
	// different type operands (for example br), then they are all printed.
	bool PrintAllTypes = false;
	const Type *TheType = Operand->getType();

	for (unsigned i = 1, E = I->getNumOperands(); i != E; ++i) {
	Operand = I->getOperand(i);
	if (Operand->getType() != TheType) {
	PrintAllTypes = true; // We have differing types! Print them all!
	break;
	}
	}

	if (!PrintAllTypes)
	Out << " " << I->getOperand(0)->getType();

	for (unsigned i = 0, E = I->getNumOperands(); i != E; ++i) {
	if (i) Out << ",";
	writeOperand(I->getOperand(i), PrintAllTypes);
	}
	}

	// Print a little comment after the instruction indicating which slot it
	// occupies.
	//
	if (I->getType() != Type::VoidTy) {
	Out << "\t\t; <" << I->getType() << ">";

	if (!I->hasName()) {
	int Slot = Table.getValSlot(I); // Print out the def slot taken...
	if (Slot >= 0) Out << ":" << Slot;
	else Out << ":<badref>";
	}
	Out << "\t[#uses=" << I->use_size() << "]"; // Output # uses
	}
	Out << endl;
	}


	//===----------------------------------------------------------------------===//
	// External Interface declarations
	//===----------------------------------------------------------------------===//



	void WriteToAssembly(const Module *M, ostream &o) {
	if (M == 0) { o << "<null> module\n"; return; }
	SlotCalculator SlotTable(M, true);
	AssemblyWriter W(o, SlotTable);

	W.write(M);
	}

	void WriteToAssembly(const GlobalVariable *G, ostream &o) {
	if (G == 0) { o << "<null> global variable\n"; return; }
	SlotCalculator SlotTable(G->getParent(), true);
	AssemblyWriter W(o, SlotTable);
	W.write(G);
	}

	void WriteToAssembly(const Method *M, ostream &o) {
	if (M == 0) { o << "<null> method\n"; return; }
	SlotCalculator SlotTable(M->getParent(), true);
	AssemblyWriter W(o, SlotTable);

	W.write(M);
	}


	void WriteToAssembly(const BasicBlock *BB, ostream &o) {
	if (BB == 0) { o << "<null> basic block\n"; return; }

	SlotCalculator SlotTable(BB->getParent(), true);
	AssemblyWriter W(o, SlotTable);

	W.write(BB);
	}

	void WriteToAssembly(const ConstPoolVal *CPV, ostream &o) {
	if (CPV == 0) { o << "<null> constant pool value\n"; return; }
	WriteAsOperand(o, CPV, true, true, 0);
	}

	void WriteToAssembly(const Instruction *I, ostream &o) {
	if (I == 0) { o << "<null> instruction\n"; return; }

	SlotCalculator SlotTable(I->getParent() ? I->getParent()->getParent() : 0,
	true);
	AssemblyWriter W(o, SlotTable);

	W.write(I);
	}