lib/Bytecode/Reader/InstructionReader.cpp - fp2-dev/platform/external/llvm - Gitiles

 //===- ReadInst.cpp - Code to read an instruction from bytecode -----------===//
 //
 // This file defines the mechanism to read an instruction from a bytecode
 // stream.
 //
 // Note that this library should be as fast as possible, reentrant, and
 // threadsafe!!
 //
 // TODO: Change from getValue(Raw.Arg1) etc, to getArg(Raw, 1)
 //       Make it check type, so that casts are checked.
 //
 //===----------------------------------------------------------------------===//

 #include "ReaderInternals.h"
 #include "llvm/iTerminators.h"
 #include "llvm/iMemory.h"
 #include "llvm/iPHINode.h"
 #include "llvm/iOther.h"
 #include <iostream>
 using std::vector;
 using std::cerr;

 bool BytecodeParser::ParseRawInst(const uchar *&Buf, const uchar *EndBuf,
 				  RawInst &Result) {
   unsigned Op, Typ;
   if (read(Buf, EndBuf, Op)) return failure(true);

   // bits   Instruction format:        Common to all formats
   // --------------------------
   // 01-00: Opcode type, fixed to 1.
   // 07-02: Opcode
   Result.NumOperands = (Op >> 0) & 03;
   Result.Opcode      = (Op >> 2) & 63;

   switch (Result.NumOperands) {
   case 1:
     // bits   Instruction format:
     // --------------------------
     // 19-08: Resulting type plane
     // 31-20: Operand #1 (if set to (2^12-1), then zero operands)
     //
     Result.Ty   = getType((Op >> 8) & 4095);
     Result.Arg1 = (Op >> 20) & 4095;
     if (Result.Arg1 == 4095)    // Handle special encoding for 0 operands...
       Result.NumOperands = 0;
     break;
   case 2:
     // bits   Instruction format:
     // --------------------------
     // 15-08: Resulting type plane
     // 23-16: Operand #1
     // 31-24: Operand #2
     //
     Result.Ty   = getType((Op >> 8) & 255);
     Result.Arg1 = (Op >> 16) & 255;
     Result.Arg2 = (Op >> 24) & 255;
     break;
   case 3:
     // bits   Instruction format:
     // --------------------------
     // 13-08: Resulting type plane
     // 19-14: Operand #1
     // 25-20: Operand #2
     // 31-26: Operand #3
     //
     Result.Ty   = getType((Op >> 8) & 63);
     Result.Arg1 = (Op >> 14) & 63;
     Result.Arg2 = (Op >> 20) & 63;
     Result.Arg3 = (Op >> 26) & 63;
     break;
   case 0:
     Buf -= 4;  // Hrm, try this again...
     if (read_vbr(Buf, EndBuf, Result.Opcode)) return failure(true);
     Result.Opcode >>= 2;
     if (read_vbr(Buf, EndBuf, Typ)) return failure(true);
     Result.Ty = getType(Typ);
     if (Result.Ty == 0) return failure(true);
     if (read_vbr(Buf, EndBuf, Result.NumOperands)) return failure(true);

     switch (Result.NumOperands) {
     case 0:
       cerr << "Zero Arg instr found!\n";
       return failure(true);  // This encoding is invalid!
     case 1:
       if (read_vbr(Buf, EndBuf, Result.Arg1)) return failure(true);
       break;
     case 2:
       if (read_vbr(Buf, EndBuf, Result.Arg1) ||
 	  read_vbr(Buf, EndBuf, Result.Arg2)) return failure(true);
       break;
     case 3:
       if (read_vbr(Buf, EndBuf, Result.Arg1) ||
 	  read_vbr(Buf, EndBuf, Result.Arg2) ||
           read_vbr(Buf, EndBuf, Result.Arg3)) return failure(true);
       break;
     default:
       if (read_vbr(Buf, EndBuf, Result.Arg1) ||
 	  read_vbr(Buf, EndBuf, Result.Arg2)) return failure(true);

       // Allocate a vector to hold arguments 3, 4, 5, 6 ...
       Result.VarArgs = new vector<unsigned>(Result.NumOperands-2);
       for (unsigned a = 0; a < Result.NumOperands-2; a++)
 	if (read_vbr(Buf, EndBuf, (*Result.VarArgs)[a])) return failure(true);
       break;
     }
     if (align32(Buf, EndBuf)) return failure(true);
     break;
   }

 #if 0
   cerr << "NO: "  << Result.NumOperands   << " opcode: " << Result.Opcode
        << " Ty: " << Result.Ty->getDescription() << " arg1: "   << Result.Arg1
        << " arg2: "   << Result.Arg2 << " arg3: "   << Result.Arg3 << "\n";
 #endif
   return false;
 }


 bool BytecodeParser::ParseInstruction(const uchar *&Buf, const uchar *EndBuf,
 				      Instruction *&Res) {
   RawInst Raw;
   if (ParseRawInst(Buf, EndBuf, Raw))
     return failure(true);

   if (Raw.Opcode >= Instruction::FirstUnaryOp &&
       Raw.Opcode <  Instruction::NumUnaryOps  && Raw.NumOperands == 1) {
     Res = UnaryOperator::create((Instruction::UnaryOps)Raw.Opcode,
 				getValue(Raw.Ty,Raw.Arg1));
     return false;
   } else if (Raw.Opcode >= Instruction::FirstBinaryOp &&
 	     Raw.Opcode <  Instruction::NumBinaryOps  && Raw.NumOperands == 2) {
     Res = BinaryOperator::create((Instruction::BinaryOps)Raw.Opcode,
 				 getValue(Raw.Ty, Raw.Arg1),
 				 getValue(Raw.Ty, Raw.Arg2));
     return false;
   }

   Value *V;
   switch (Raw.Opcode) {
   case Instruction::Cast: {
     V = getValue(Raw.Ty, Raw.Arg1);
     const Type *Ty = getType(Raw.Arg2);
     if (V == 0 || Ty == 0) { cerr << "Invalid cast!\n"; return true; }
     Res = new CastInst(V, Ty);
     return false;
   }
   case Instruction::PHINode: {
     PHINode *PN = new PHINode(Raw.Ty);
     switch (Raw.NumOperands) {
     case 0:
     case 1:
     case 3: cerr << "Invalid phi node encountered!\n";
             delete PN;
 	    return failure(true);
     case 2: PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
 			    cast<BasicBlock>(getValue(Type::LabelTy,Raw.Arg2)));
       break;
     default:
       PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
 		      cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)));
       if (Raw.VarArgs->size() & 1) {
 	cerr << "PHI Node with ODD number of arguments!\n";
 	delete PN;
 	return failure(true);
       } else {
         vector<unsigned> &args = *Raw.VarArgs;
         for (unsigned i = 0; i < args.size(); i+=2)
           PN->addIncoming(getValue(Raw.Ty, args[i]),
 			  cast<BasicBlock>(getValue(Type::LabelTy, args[i+1])));
       }
       delete Raw.VarArgs;
       break;
     }
     Res = PN;
     return false;
   }

   case Instruction::Shl:
   case Instruction::Shr:
     Res = new ShiftInst((Instruction::OtherOps)Raw.Opcode,
 			getValue(Raw.Ty, Raw.Arg1),
 			getValue(Type::UByteTy, Raw.Arg2));
     return false;
   case Instruction::Ret:
     if (Raw.NumOperands == 0) {
       Res = new ReturnInst(); return false;
     } else if (Raw.NumOperands == 1) {
       Res = new ReturnInst(getValue(Raw.Ty, Raw.Arg1)); return false;
     }
     break;

   case Instruction::Br:
     if (Raw.NumOperands == 1) {
       Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg1)));
       return false;
     } else if (Raw.NumOperands == 3) {
       Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg1)),
 			   cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)),
                                             getValue(Type::BoolTy , Raw.Arg3));
       return false;
     }
     break;

   case Instruction::Switch: {
     SwitchInst *I =
       new SwitchInst(getValue(Raw.Ty, Raw.Arg1),
                      cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)));
     Res = I;
     if (Raw.NumOperands < 3) return false;  // No destinations?  Wierd.

     if (Raw.NumOperands == 3 || Raw.VarArgs->size() & 1) {
       cerr << "Switch statement with odd number of arguments!\n";
       delete I;
       return failure(true);
     }

     vector<unsigned> &args = *Raw.VarArgs;
     for (unsigned i = 0; i < args.size(); i += 2)
       I->dest_push_back(cast<Constant>(getValue(Raw.Ty, args[i])),
                         cast<BasicBlock>(getValue(Type::LabelTy, args[i+1])));

     delete Raw.VarArgs;
     return false;
   }

   case Instruction::Call: {
     Value *M = getValue(Raw.Ty, Raw.Arg1);
     if (M == 0) return failure(true);

     // Check to make sure we have a pointer to method type
     PointerType *PTy = dyn_cast<PointerType>(M->getType());
     if (PTy == 0) return failure(true);
     FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
     if (MTy == 0) return failure(true);

     vector<Value *> Params;
     const FunctionType::ParamTypes &PL = MTy->getParamTypes();

     if (!MTy->isVarArg()) {
       FunctionType::ParamTypes::const_iterator It = PL.begin();

       switch (Raw.NumOperands) {
       case 0: cerr << "Invalid call instruction encountered!\n";
 	return failure(true);
       case 1: break;
       case 2: Params.push_back(getValue(*It++, Raw.Arg2)); break;
       case 3: Params.push_back(getValue(*It++, Raw.Arg2));
 	if (It == PL.end()) return failure(true);
 	Params.push_back(getValue(*It++, Raw.Arg3)); break;
       default:
 	Params.push_back(getValue(*It++, Raw.Arg2));
 	{
 	  vector<unsigned> &args = *Raw.VarArgs;
 	  for (unsigned i = 0; i < args.size(); i++) {
 	    if (It == PL.end()) return failure(true);
 	    // TODO: Check getValue for null!
 	    Params.push_back(getValue(*It++, args[i]));
 	  }
 	}
 	delete Raw.VarArgs;
       }
       if (It != PL.end()) return failure(true);
     } else {
       if (Raw.NumOperands > 2) {
 	vector<unsigned> &args = *Raw.VarArgs;
 	if (args.size() < 1) return failure(true);

 	if ((args.size() & 1) != 0)
 	  return failure(true);  // Must be pairs of type/value
 	for (unsigned i = 0; i < args.size(); i+=2) {
 	  const Type *Ty = getType(args[i]);
 	  if (Ty == 0)
 	    return failure(true);

 	  Value *V = getValue(Ty, args[i+1]);
 	  if (V == 0) return failure(true);
 	  Params.push_back(V);
 	}
 	delete Raw.VarArgs;
       }
     }

     Res = new CallInst(M, Params);
     return false;
   }
   case Instruction::Invoke: {
     Value *M = getValue(Raw.Ty, Raw.Arg1);
     if (M == 0) return failure(true);

     // Check to make sure we have a pointer to method type
     PointerType *PTy = dyn_cast<PointerType>(M->getType());
     if (PTy == 0) return failure(true);
     FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
     if (MTy == 0) return failure(true);

     vector<Value *> Params;
     const FunctionType::ParamTypes &PL = MTy->getParamTypes();
     vector<unsigned> &args = *Raw.VarArgs;

     BasicBlock *Normal, *Except;

     if (!MTy->isVarArg()) {
       if (Raw.NumOperands < 3) return failure(true);

       Normal = cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2));
       Except = cast<BasicBlock>(getValue(Type::LabelTy, args[0]));

       FunctionType::ParamTypes::const_iterator It = PL.begin();
       for (unsigned i = 1; i < args.size(); i++) {
 	if (It == PL.end()) return failure(true);
 	// TODO: Check getValue for null!
 	Params.push_back(getValue(*It++, args[i]));
       }

       if (It != PL.end()) return failure(true);
     } else {
       if (args.size() < 4) return failure(true);

       Normal = cast<BasicBlock>(getValue(Type::LabelTy, args[0]));
       Except = cast<BasicBlock>(getValue(Type::LabelTy, args[2]));

       if ((args.size() & 1) != 0)
 	return failure(true);  // Must be pairs of type/value
       for (unsigned i = 4; i < args.size(); i+=2) {
 	// TODO: Check getValue for null!
 	Params.push_back(getValue(getType(args[i]), args[i+1]));
       }
     }

     delete Raw.VarArgs;
     Res = new InvokeInst(M, Normal, Except, Params);
     return false;
   }
   case Instruction::Malloc:
     if (Raw.NumOperands > 2) return failure(true);
     V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
     Res = new MallocInst(Raw.Ty, V);
     return false;

   case Instruction::Alloca:
     if (Raw.NumOperands > 2) return failure(true);
     V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
     Res = new AllocaInst(Raw.Ty, V);
     return false;

   case Instruction::Free:
     V = getValue(Raw.Ty, Raw.Arg1);
     if (!isa<PointerType>(V->getType())) return failure(true);
     Res = new FreeInst(V);
     return false;

   case Instruction::Load:
   case Instruction::GetElementPtr: {
     vector<Value*> Idx;
     if (!isa<PointerType>(Raw.Ty)) return failure(true);
     const CompositeType *TopTy = dyn_cast<CompositeType>(Raw.Ty);

     switch (Raw.NumOperands) {
     case 0: cerr << "Invalid load encountered!\n"; return failure(true);
     case 1: break;
     case 2:
       if (!TopTy) return failure(true);
       Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
       if (!V) return failure(true);
       break;
     case 3: {
       if (!TopTy) return failure(true);
       Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
       if (!V) return failure(true);

       const Type *ETy = MemAccessInst::getIndexedType(TopTy, Idx, true);
       const CompositeType *ElTy = dyn_cast_or_null<CompositeType>(ETy);
       if (!ElTy) return failure(true);

       Idx.push_back(V = getValue(ElTy->getIndexType(), Raw.Arg3));
       if (!V) return failure(true);
       break;
     }
     default:
       if (!TopTy) return failure(true);
       Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
       if (!V) return failure(true);

       vector<unsigned> &args = *Raw.VarArgs;
       for (unsigned i = 0, E = args.size(); i != E; ++i) {
         const Type *ETy = MemAccessInst::getIndexedType(Raw.Ty, Idx, true);
         const CompositeType *ElTy = dyn_cast_or_null<CompositeType>(ETy);
         if (!ElTy) return failure(true);
 	Idx.push_back(V = getValue(ElTy->getIndexType(), args[i]));
 	if (!V) return failure(true);
       }
       delete Raw.VarArgs;
       break;
     }

     if (Raw.Opcode == Instruction::Load) {
       assert(MemAccessInst::getIndexedType(Raw.Ty, Idx) &&
              "Bad indices for Load!");
       Res = new LoadInst(getValue(Raw.Ty, Raw.Arg1), Idx);
     } else if (Raw.Opcode == Instruction::GetElementPtr)
       Res = new GetElementPtrInst(getValue(Raw.Ty, Raw.Arg1), Idx);
     else
       abort();
     return false;
   }
   case Instruction::Store: {
     vector<Value*> Idx;
     if (!isa<PointerType>(Raw.Ty)) return failure(true);
     const CompositeType *TopTy = dyn_cast<CompositeType>(Raw.Ty);

     switch (Raw.NumOperands) {
     case 0:
     case 1: cerr << "Invalid store encountered!\n"; return failure(true);
     case 2: break;
     case 3:
       if (!TopTy) return failure(true);
       Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg3));
       if (!V) return failure(true);
       break;
     default:
       vector<unsigned> &args = *Raw.VarArgs;
       const CompositeType *ElTy = TopTy;
       unsigned i, E;
       for (i = 0, E = args.size(); ElTy && i != E; ++i) {
 	Idx.push_back(V = getValue(ElTy->getIndexType(), args[i]));
 	if (!V) return failure(true);

         const Type *ETy = MemAccessInst::getIndexedType(Raw.Ty, Idx, true);
         ElTy = dyn_cast_or_null<CompositeType>(ETy);
       }
       if (i != E)
         return failure(true);  // didn't use up all of the indices!

       delete Raw.VarArgs;
       break;
     }

     const Type *ElType = StoreInst::getIndexedType(Raw.Ty, Idx);
     if (ElType == 0) return failure(true);
     Res = new StoreInst(getValue(ElType, Raw.Arg1), getValue(Raw.Ty, Raw.Arg2),
 			Idx);
     return false;
   }
   }  // end switch(Raw.Opcode)

   cerr << "Unrecognized instruction! " << Raw.Opcode
        << " ADDR = 0x" << (void*)Buf << "\n";
   return failure(true);
 }
	//===- ReadInst.cpp - Code to read an instruction from bytecode -----------===//
	//
	// This file defines the mechanism to read an instruction from a bytecode
	// stream.
	//
	// Note that this library should be as fast as possible, reentrant, and
	// threadsafe!!
	//
	// TODO: Change from getValue(Raw.Arg1) etc, to getArg(Raw, 1)
	// Make it check type, so that casts are checked.
	//
	//===----------------------------------------------------------------------===//

	#include "ReaderInternals.h"
	#include "llvm/iTerminators.h"
	#include "llvm/iMemory.h"
	#include "llvm/iPHINode.h"
	#include "llvm/iOther.h"
	#include <iostream>
	using std::vector;
	using std::cerr;

	bool BytecodeParser::ParseRawInst(const uchar &Buf, const uchar EndBuf,
	RawInst &Result) {
	unsigned Op, Typ;
	if (read(Buf, EndBuf, Op)) return failure(true);

	// bits Instruction format: Common to all formats
	// --------------------------
	// 01-00: Opcode type, fixed to 1.
	// 07-02: Opcode
	Result.NumOperands = (Op >> 0) & 03;
	Result.Opcode = (Op >> 2) & 63;

	switch (Result.NumOperands) {
	case 1:
	// bits Instruction format:
	// --------------------------
	// 19-08: Resulting type plane
	// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
	//
	Result.Ty = getType((Op >> 8) & 4095);
	Result.Arg1 = (Op >> 20) & 4095;
	if (Result.Arg1 == 4095) // Handle special encoding for 0 operands...
	Result.NumOperands = 0;
	break;
	case 2:
	// bits Instruction format:
	// --------------------------
	// 15-08: Resulting type plane
	// 23-16: Operand #1
	// 31-24: Operand #2
	//
	Result.Ty = getType((Op >> 8) & 255);
	Result.Arg1 = (Op >> 16) & 255;
	Result.Arg2 = (Op >> 24) & 255;
	break;
	case 3:
	// bits Instruction format:
	// --------------------------
	// 13-08: Resulting type plane
	// 19-14: Operand #1
	// 25-20: Operand #2
	// 31-26: Operand #3
	//
	Result.Ty = getType((Op >> 8) & 63);
	Result.Arg1 = (Op >> 14) & 63;
	Result.Arg2 = (Op >> 20) & 63;
	Result.Arg3 = (Op >> 26) & 63;
	break;
	case 0:
	Buf -= 4; // Hrm, try this again...
	if (read_vbr(Buf, EndBuf, Result.Opcode)) return failure(true);
	Result.Opcode >>= 2;
	if (read_vbr(Buf, EndBuf, Typ)) return failure(true);
	Result.Ty = getType(Typ);
	if (Result.Ty == 0) return failure(true);
	if (read_vbr(Buf, EndBuf, Result.NumOperands)) return failure(true);

	switch (Result.NumOperands) {
	case 0:
	cerr << "Zero Arg instr found!\n";
	return failure(true); // This encoding is invalid!
	case 1:
	if (read_vbr(Buf, EndBuf, Result.Arg1)) return failure(true);
	break;
	case 2:
	if (read_vbr(Buf, EndBuf, Result.Arg1) \|\|
	read_vbr(Buf, EndBuf, Result.Arg2)) return failure(true);
	break;
	case 3:
	if (read_vbr(Buf, EndBuf, Result.Arg1) \|\|
	read_vbr(Buf, EndBuf, Result.Arg2) \|\|
	read_vbr(Buf, EndBuf, Result.Arg3)) return failure(true);
	break;
	default:
	if (read_vbr(Buf, EndBuf, Result.Arg1) \|\|
	read_vbr(Buf, EndBuf, Result.Arg2)) return failure(true);

	// Allocate a vector to hold arguments 3, 4, 5, 6 ...
	Result.VarArgs = new vector<unsigned>(Result.NumOperands-2);
	for (unsigned a = 0; a < Result.NumOperands-2; a++)
	if (read_vbr(Buf, EndBuf, (*Result.VarArgs)[a])) return failure(true);
	break;
	}
	if (align32(Buf, EndBuf)) return failure(true);
	break;
	}

	#if 0
	cerr << "NO: " << Result.NumOperands << " opcode: " << Result.Opcode
	<< " Ty: " << Result.Ty->getDescription() << " arg1: " << Result.Arg1
	<< " arg2: " << Result.Arg2 << " arg3: " << Result.Arg3 << "\n";
	#endif
	return false;
	}


	bool BytecodeParser::ParseInstruction(const uchar &Buf, const uchar EndBuf,
	Instruction *&Res) {
	RawInst Raw;
	if (ParseRawInst(Buf, EndBuf, Raw))
	return failure(true);

	if (Raw.Opcode >= Instruction::FirstUnaryOp &&
	Raw.Opcode < Instruction::NumUnaryOps && Raw.NumOperands == 1) {
	Res = UnaryOperator::create((Instruction::UnaryOps)Raw.Opcode,
	getValue(Raw.Ty,Raw.Arg1));
	return false;
	} else if (Raw.Opcode >= Instruction::FirstBinaryOp &&
	Raw.Opcode < Instruction::NumBinaryOps && Raw.NumOperands == 2) {
	Res = BinaryOperator::create((Instruction::BinaryOps)Raw.Opcode,
	getValue(Raw.Ty, Raw.Arg1),
	getValue(Raw.Ty, Raw.Arg2));
	return false;
	}

	Value *V;
	switch (Raw.Opcode) {
	case Instruction::Cast: {
	V = getValue(Raw.Ty, Raw.Arg1);
	const Type *Ty = getType(Raw.Arg2);
	if (V == 0 \|\| Ty == 0) { cerr << "Invalid cast!\n"; return true; }
	Res = new CastInst(V, Ty);
	return false;
	}
	case Instruction::PHINode: {
	PHINode *PN = new PHINode(Raw.Ty);
	switch (Raw.NumOperands) {
	case 0:
	case 1:
	case 3: cerr << "Invalid phi node encountered!\n";
	delete PN;
	return failure(true);
	case 2: PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
	cast<BasicBlock>(getValue(Type::LabelTy,Raw.Arg2)));
	break;
	default:
	PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
	cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)));
	if (Raw.VarArgs->size() & 1) {
	cerr << "PHI Node with ODD number of arguments!\n";
	delete PN;
	return failure(true);
	} else {
	vector<unsigned> &args = *Raw.VarArgs;
	for (unsigned i = 0; i < args.size(); i+=2)
	PN->addIncoming(getValue(Raw.Ty, args[i]),
	cast<BasicBlock>(getValue(Type::LabelTy, args[i+1])));
	}
	delete Raw.VarArgs;
	break;
	}
	Res = PN;
	return false;
	}

	case Instruction::Shl:
	case Instruction::Shr:
	Res = new ShiftInst((Instruction::OtherOps)Raw.Opcode,
	getValue(Raw.Ty, Raw.Arg1),
	getValue(Type::UByteTy, Raw.Arg2));
	return false;
	case Instruction::Ret:
	if (Raw.NumOperands == 0) {
	Res = new ReturnInst(); return false;
	} else if (Raw.NumOperands == 1) {
	Res = new ReturnInst(getValue(Raw.Ty, Raw.Arg1)); return false;
	}
	break;

	case Instruction::Br:
	if (Raw.NumOperands == 1) {
	Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg1)));
	return false;
	} else if (Raw.NumOperands == 3) {
	Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg1)),
	cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)),
	getValue(Type::BoolTy , Raw.Arg3));
	return false;
	}
	break;

	case Instruction::Switch: {
	SwitchInst *I =
	new SwitchInst(getValue(Raw.Ty, Raw.Arg1),
	cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)));
	Res = I;
	if (Raw.NumOperands < 3) return false; // No destinations? Wierd.

	if (Raw.NumOperands == 3 \|\| Raw.VarArgs->size() & 1) {
	cerr << "Switch statement with odd number of arguments!\n";
	delete I;
	return failure(true);
	}

	vector<unsigned> &args = *Raw.VarArgs;
	for (unsigned i = 0; i < args.size(); i += 2)
	I->dest_push_back(cast<Constant>(getValue(Raw.Ty, args[i])),
	cast<BasicBlock>(getValue(Type::LabelTy, args[i+1])));

	delete Raw.VarArgs;
	return false;
	}

	case Instruction::Call: {
	Value *M = getValue(Raw.Ty, Raw.Arg1);
	if (M == 0) return failure(true);

	// Check to make sure we have a pointer to method type
	PointerType *PTy = dyn_cast<PointerType>(M->getType());
	if (PTy == 0) return failure(true);
	FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
	if (MTy == 0) return failure(true);

	vector<Value *> Params;
	const FunctionType::ParamTypes &PL = MTy->getParamTypes();

	if (!MTy->isVarArg()) {
	FunctionType::ParamTypes::const_iterator It = PL.begin();

	switch (Raw.NumOperands) {
	case 0: cerr << "Invalid call instruction encountered!\n";
	return failure(true);
	case 1: break;
	case 2: Params.push_back(getValue(*It++, Raw.Arg2)); break;
	case 3: Params.push_back(getValue(*It++, Raw.Arg2));
	if (It == PL.end()) return failure(true);
	Params.push_back(getValue(*It++, Raw.Arg3)); break;
	default:
	Params.push_back(getValue(*It++, Raw.Arg2));
	{
	vector<unsigned> &args = *Raw.VarArgs;
	for (unsigned i = 0; i < args.size(); i++) {
	if (It == PL.end()) return failure(true);
	// TODO: Check getValue for null!
	Params.push_back(getValue(*It++, args[i]));
	}
	}
	delete Raw.VarArgs;
	}
	if (It != PL.end()) return failure(true);
	} else {
	if (Raw.NumOperands > 2) {
	vector<unsigned> &args = *Raw.VarArgs;
	if (args.size() < 1) return failure(true);

	if ((args.size() & 1) != 0)
	return failure(true); // Must be pairs of type/value
	for (unsigned i = 0; i < args.size(); i+=2) {
	const Type *Ty = getType(args[i]);
	if (Ty == 0)
	return failure(true);

	Value *V = getValue(Ty, args[i+1]);
	if (V == 0) return failure(true);
	Params.push_back(V);
	}
	delete Raw.VarArgs;
	}
	}

	Res = new CallInst(M, Params);
	return false;
	}
	case Instruction::Invoke: {
	Value *M = getValue(Raw.Ty, Raw.Arg1);
	if (M == 0) return failure(true);

	// Check to make sure we have a pointer to method type
	PointerType *PTy = dyn_cast<PointerType>(M->getType());
	if (PTy == 0) return failure(true);
	FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
	if (MTy == 0) return failure(true);

	vector<Value *> Params;
	const FunctionType::ParamTypes &PL = MTy->getParamTypes();
	vector<unsigned> &args = *Raw.VarArgs;

	BasicBlock Normal, Except;

	if (!MTy->isVarArg()) {
	if (Raw.NumOperands < 3) return failure(true);

	Normal = cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2));
	Except = cast<BasicBlock>(getValue(Type::LabelTy, args[0]));

	FunctionType::ParamTypes::const_iterator It = PL.begin();
	for (unsigned i = 1; i < args.size(); i++) {
	if (It == PL.end()) return failure(true);
	// TODO: Check getValue for null!
	Params.push_back(getValue(*It++, args[i]));
	}

	if (It != PL.end()) return failure(true);
	} else {
	if (args.size() < 4) return failure(true);

	Normal = cast<BasicBlock>(getValue(Type::LabelTy, args[0]));
	Except = cast<BasicBlock>(getValue(Type::LabelTy, args[2]));

	if ((args.size() & 1) != 0)
	return failure(true); // Must be pairs of type/value
	for (unsigned i = 4; i < args.size(); i+=2) {
	// TODO: Check getValue for null!
	Params.push_back(getValue(getType(args[i]), args[i+1]));
	}
	}

	delete Raw.VarArgs;
	Res = new InvokeInst(M, Normal, Except, Params);
	return false;
	}
	case Instruction::Malloc:
	if (Raw.NumOperands > 2) return failure(true);
	V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
	Res = new MallocInst(Raw.Ty, V);
	return false;

	case Instruction::Alloca:
	if (Raw.NumOperands > 2) return failure(true);
	V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
	Res = new AllocaInst(Raw.Ty, V);
	return false;

	case Instruction::Free:
	V = getValue(Raw.Ty, Raw.Arg1);
	if (!isa<PointerType>(V->getType())) return failure(true);
	Res = new FreeInst(V);
	return false;

	case Instruction::Load:
	case Instruction::GetElementPtr: {
	vector<Value*> Idx;
	if (!isa<PointerType>(Raw.Ty)) return failure(true);
	const CompositeType *TopTy = dyn_cast<CompositeType>(Raw.Ty);

	switch (Raw.NumOperands) {
	case 0: cerr << "Invalid load encountered!\n"; return failure(true);
	case 1: break;
	case 2:
	if (!TopTy) return failure(true);
	Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
	if (!V) return failure(true);
	break;
	case 3: {
	if (!TopTy) return failure(true);
	Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
	if (!V) return failure(true);

	const Type *ETy = MemAccessInst::getIndexedType(TopTy, Idx, true);
	const CompositeType *ElTy = dyn_cast_or_null<CompositeType>(ETy);
	if (!ElTy) return failure(true);

	Idx.push_back(V = getValue(ElTy->getIndexType(), Raw.Arg3));
	if (!V) return failure(true);
	break;
	}
	default:
	if (!TopTy) return failure(true);
	Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
	if (!V) return failure(true);

	vector<unsigned> &args = *Raw.VarArgs;
	for (unsigned i = 0, E = args.size(); i != E; ++i) {
	const Type *ETy = MemAccessInst::getIndexedType(Raw.Ty, Idx, true);
	const CompositeType *ElTy = dyn_cast_or_null<CompositeType>(ETy);
	if (!ElTy) return failure(true);
	Idx.push_back(V = getValue(ElTy->getIndexType(), args[i]));
	if (!V) return failure(true);
	}
	delete Raw.VarArgs;
	break;
	}

	if (Raw.Opcode == Instruction::Load) {
	assert(MemAccessInst::getIndexedType(Raw.Ty, Idx) &&
	"Bad indices for Load!");
	Res = new LoadInst(getValue(Raw.Ty, Raw.Arg1), Idx);
	} else if (Raw.Opcode == Instruction::GetElementPtr)
	Res = new GetElementPtrInst(getValue(Raw.Ty, Raw.Arg1), Idx);
	else
	abort();
	return false;
	}
	case Instruction::Store: {
	vector<Value*> Idx;
	if (!isa<PointerType>(Raw.Ty)) return failure(true);
	const CompositeType *TopTy = dyn_cast<CompositeType>(Raw.Ty);

	switch (Raw.NumOperands) {
	case 0:
	case 1: cerr << "Invalid store encountered!\n"; return failure(true);
	case 2: break;
	case 3:
	if (!TopTy) return failure(true);
	Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg3));
	if (!V) return failure(true);
	break;
	default:
	vector<unsigned> &args = *Raw.VarArgs;
	const CompositeType *ElTy = TopTy;
	unsigned i, E;
	for (i = 0, E = args.size(); ElTy && i != E; ++i) {
	Idx.push_back(V = getValue(ElTy->getIndexType(), args[i]));
	if (!V) return failure(true);

	const Type *ETy = MemAccessInst::getIndexedType(Raw.Ty, Idx, true);
	ElTy = dyn_cast_or_null<CompositeType>(ETy);
	}
	if (i != E)
	return failure(true); // didn't use up all of the indices!

	delete Raw.VarArgs;
	break;
	}

	const Type *ElType = StoreInst::getIndexedType(Raw.Ty, Idx);
	if (ElType == 0) return failure(true);
	Res = new StoreInst(getValue(ElType, Raw.Arg1), getValue(Raw.Ty, Raw.Arg2),
	Idx);
	return false;
	}
	} // end switch(Raw.Opcode)

	cerr << "Unrecognized instruction! " << Raw.Opcode
	<< " ADDR = 0x" << (void*)Buf << "\n";
	return failure(true);
	}