bool PopulateCilInstructions() {
   MethodBodyDocument document = new MethodBodyDocument(this.MethodDefinition);
   MemoryReader memReader = new MemoryReader(this.MethodIL.EncodedILMemoryBlock);
   var numInstructions = CountCilInstructions(memReader);
   if (numInstructions == 0) return true;
   CilInstruction[] instrList = new CilInstruction[numInstructions];
   int instructionNumber = 0;
   while (memReader.NotEndOfBytes) {
     object/*?*/ value = null;
     uint offset = (uint)memReader.Offset;
     OperationCode cilOpCode = memReader.ReadOpcode();
     switch (cilOpCode) {
       case OperationCode.Nop:
       case OperationCode.Break:
         break;
       case OperationCode.Ldarg_0:
       case OperationCode.Ldarg_1:
       case OperationCode.Ldarg_2:
       case OperationCode.Ldarg_3:
         value = this.GetParameter((uint)(cilOpCode - OperationCode.Ldarg_0));
         break;
       case OperationCode.Ldloc_0:
       case OperationCode.Ldloc_1:
       case OperationCode.Ldloc_2:
       case OperationCode.Ldloc_3:
         value = this.GetLocal((uint)(cilOpCode - OperationCode.Ldloc_0));
         break;
       case OperationCode.Stloc_0:
       case OperationCode.Stloc_1:
       case OperationCode.Stloc_2:
       case OperationCode.Stloc_3:
         value = this.GetLocal((uint)(cilOpCode - OperationCode.Stloc_0));
         break;
       case OperationCode.Ldarg_S:
       case OperationCode.Ldarga_S:
       case OperationCode.Starg_S:
         value = this.GetParameter(memReader.ReadByte());
         break;
       case OperationCode.Ldloc_S:
       case OperationCode.Ldloca_S:
       case OperationCode.Stloc_S:
         value = this.GetLocal(memReader.ReadByte());
         break;
       case OperationCode.Ldnull:
       case OperationCode.Ldc_I4_M1:
       case OperationCode.Ldc_I4_0:
       case OperationCode.Ldc_I4_1:
       case OperationCode.Ldc_I4_2:
       case OperationCode.Ldc_I4_3:
       case OperationCode.Ldc_I4_4:
       case OperationCode.Ldc_I4_5:
       case OperationCode.Ldc_I4_6:
       case OperationCode.Ldc_I4_7:
       case OperationCode.Ldc_I4_8:
         break;
       case OperationCode.Ldc_I4_S:
         value = (int)memReader.ReadSByte();
         break;
       case OperationCode.Ldc_I4:
         value = memReader.ReadInt32();
         break;
       case OperationCode.Ldc_I8:
         value = memReader.ReadInt64();
         break;
       case OperationCode.Ldc_R4:
         value = memReader.ReadSingle();
         break;
       case OperationCode.Ldc_R8:
         value = memReader.ReadDouble();
         break;
       case OperationCode.Dup:
       case OperationCode.Pop:
         break;
       case OperationCode.Jmp:
         value = this.GetMethod(memReader.ReadUInt32());
         break;
       case OperationCode.Call: {
           IMethodReference methodReference = this.GetMethod(memReader.ReadUInt32());
           IArrayTypeReference/*?*/ arrayType = methodReference.ContainingType as IArrayTypeReference;
           if (arrayType != null) {
             // For Get(), Set() and Address() on arrays, the runtime provides method implementations.
             // Hence, CCI2 replaces these with pseudo instrcutions Array_Set, Array_Get and Array_Addr.
             // All other methods on arrays will not use pseudo instruction and will have methodReference as their operand. 
             if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Set.UniqueKey) {
               cilOpCode = OperationCode.Array_Set;
               value = arrayType;
             } else if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Get.UniqueKey) {
               cilOpCode = OperationCode.Array_Get;
               value = arrayType;
             } else if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Address.UniqueKey) {
               cilOpCode = OperationCode.Array_Addr;
               value = arrayType;
             } else {
               value = methodReference;
             }
           } else {
             value = methodReference;
           }
         }
         break;
       case OperationCode.Calli:
         value = this.GetFunctionPointerType(memReader.ReadUInt32());
         break;
       case OperationCode.Ret:
         break;
       case OperationCode.Br_S:
       case OperationCode.Brfalse_S:
       case OperationCode.Brtrue_S:
       case OperationCode.Beq_S:
       case OperationCode.Bge_S:
       case OperationCode.Bgt_S:
       case OperationCode.Ble_S:
       case OperationCode.Blt_S:
       case OperationCode.Bne_Un_S:
       case OperationCode.Bge_Un_S:
       case OperationCode.Bgt_Un_S:
       case OperationCode.Ble_Un_S:
       case OperationCode.Blt_Un_S: {
           uint jumpOffset = (uint)(memReader.Offset + 1 + memReader.ReadSByte());
           if (jumpOffset >= this.EndOfMethodOffset) {
             //  Error...
           }
           value = jumpOffset;
         }
         break;
       case OperationCode.Br:
       case OperationCode.Brfalse:
       case OperationCode.Brtrue:
       case OperationCode.Beq:
       case OperationCode.Bge:
       case OperationCode.Bgt:
       case OperationCode.Ble:
       case OperationCode.Blt:
       case OperationCode.Bne_Un:
       case OperationCode.Bge_Un:
       case OperationCode.Bgt_Un:
       case OperationCode.Ble_Un:
       case OperationCode.Blt_Un: {
           uint jumpOffset = (uint)(memReader.Offset + 4 + memReader.ReadInt32());
           if (jumpOffset >= this.EndOfMethodOffset) {
             //  Error...
           }
           value = jumpOffset;
         }
         break;
       case OperationCode.Switch: {
           uint numTargets = memReader.ReadUInt32();
           uint[] result = new uint[numTargets];
           uint asOffset = memReader.Offset + numTargets * 4;
           for (int i = 0; i < numTargets; i++) {
             uint targetAddress = memReader.ReadUInt32() + asOffset;
             if (targetAddress >= this.EndOfMethodOffset) {
               //  Error...
             }
             result[i] = targetAddress;
           }
           value = result;
         }
         break;
       case OperationCode.Ldind_I1:
       case OperationCode.Ldind_U1:
       case OperationCode.Ldind_I2:
       case OperationCode.Ldind_U2:
       case OperationCode.Ldind_I4:
       case OperationCode.Ldind_U4:
       case OperationCode.Ldind_I8:
       case OperationCode.Ldind_I:
       case OperationCode.Ldind_R4:
       case OperationCode.Ldind_R8:
       case OperationCode.Ldind_Ref:
       case OperationCode.Stind_Ref:
       case OperationCode.Stind_I1:
       case OperationCode.Stind_I2:
       case OperationCode.Stind_I4:
       case OperationCode.Stind_I8:
       case OperationCode.Stind_R4:
       case OperationCode.Stind_R8:
       case OperationCode.Add:
       case OperationCode.Sub:
       case OperationCode.Mul:
       case OperationCode.Div:
       case OperationCode.Div_Un:
       case OperationCode.Rem:
       case OperationCode.Rem_Un:
       case OperationCode.And:
       case OperationCode.Or:
       case OperationCode.Xor:
       case OperationCode.Shl:
       case OperationCode.Shr:
       case OperationCode.Shr_Un:
       case OperationCode.Neg:
       case OperationCode.Not:
       case OperationCode.Conv_I1:
       case OperationCode.Conv_I2:
       case OperationCode.Conv_I4:
       case OperationCode.Conv_I8:
       case OperationCode.Conv_R4:
       case OperationCode.Conv_R8:
       case OperationCode.Conv_U4:
       case OperationCode.Conv_U8:
         break;
       case OperationCode.Callvirt: {
           IMethodReference methodReference = this.GetMethod(memReader.ReadUInt32());
           IArrayTypeReference/*?*/ arrayType = methodReference.ContainingType as IArrayTypeReference;
           if (arrayType != null) {
             // For Get(), Set() and Address() on arrays, the runtime provides method implementations.
             // Hence, CCI2 replaces these with pseudo instructions Array_Set, Array_Get and Array_Addr.
             // All other methods on arrays will not use pseudo instruction and will have methodReference as their operand. 
             if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Set.UniqueKey) {
               cilOpCode = OperationCode.Array_Set;
               value = arrayType;
             } else if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Get.UniqueKey) {
               cilOpCode = OperationCode.Array_Get;
               value = arrayType;
             } else if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Address.UniqueKey) {
               cilOpCode = OperationCode.Array_Addr;
               value = arrayType;
             } else {
               value = methodReference;
             }
           } else {
             value = methodReference;
           }
         }
         break;
       case OperationCode.Cpobj:
       case OperationCode.Ldobj:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Ldstr:
         value = this.GetUserStringForToken(memReader.ReadUInt32());
         break;
       case OperationCode.Newobj: {
           IMethodReference methodReference = this.GetMethod(memReader.ReadUInt32());
           IArrayTypeReference/*?*/ arrayType = methodReference.ContainingType as IArrayTypeReference;
           if (arrayType != null && !arrayType.IsVector) {
             uint numParam = IteratorHelper.EnumerableCount(methodReference.Parameters);
             if (numParam != arrayType.Rank)
               cilOpCode = OperationCode.Array_Create_WithLowerBound;
             else
               cilOpCode = OperationCode.Array_Create;
             value = arrayType;
           } else {
             value = methodReference;
           }
         }
         break;
       case OperationCode.Castclass:
       case OperationCode.Isinst:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Conv_R_Un:
         break;
       case OperationCode.Unbox:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Throw:
         break;
       case OperationCode.Ldfld:
       case OperationCode.Ldflda:
       case OperationCode.Stfld:
         value = this.GetField(memReader.ReadUInt32());
         break;
       case OperationCode.Ldsfld:
       case OperationCode.Ldsflda:
       case OperationCode.Stsfld:
         value = this.GetField(memReader.ReadUInt32());
         var fieldRef = value as FieldReference;
         if (fieldRef != null) fieldRef.isStatic = true;
         break;
       case OperationCode.Stobj:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Conv_Ovf_I1_Un:
       case OperationCode.Conv_Ovf_I2_Un:
       case OperationCode.Conv_Ovf_I4_Un:
       case OperationCode.Conv_Ovf_I8_Un:
       case OperationCode.Conv_Ovf_U1_Un:
       case OperationCode.Conv_Ovf_U2_Un:
       case OperationCode.Conv_Ovf_U4_Un:
       case OperationCode.Conv_Ovf_U8_Un:
       case OperationCode.Conv_Ovf_I_Un:
       case OperationCode.Conv_Ovf_U_Un:
         break;
       case OperationCode.Box:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Newarr: {
           var elementType = this.GetType(memReader.ReadUInt32());
           if (elementType != null)
             value = Vector.GetVector(elementType, PEFileToObjectModel.InternFactory);
           else
             value = Dummy.ArrayType;
         }
         break;
       case OperationCode.Ldlen:
         break;
       case OperationCode.Ldelema:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Ldelem_I1:
       case OperationCode.Ldelem_U1:
       case OperationCode.Ldelem_I2:
       case OperationCode.Ldelem_U2:
       case OperationCode.Ldelem_I4:
       case OperationCode.Ldelem_U4:
       case OperationCode.Ldelem_I8:
       case OperationCode.Ldelem_I:
       case OperationCode.Ldelem_R4:
       case OperationCode.Ldelem_R8:
       case OperationCode.Ldelem_Ref:
       case OperationCode.Stelem_I:
       case OperationCode.Stelem_I1:
       case OperationCode.Stelem_I2:
       case OperationCode.Stelem_I4:
       case OperationCode.Stelem_I8:
       case OperationCode.Stelem_R4:
       case OperationCode.Stelem_R8:
       case OperationCode.Stelem_Ref:
         break;
       case OperationCode.Ldelem:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Stelem:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Unbox_Any:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Conv_Ovf_I1:
       case OperationCode.Conv_Ovf_U1:
       case OperationCode.Conv_Ovf_I2:
       case OperationCode.Conv_Ovf_U2:
       case OperationCode.Conv_Ovf_I4:
       case OperationCode.Conv_Ovf_U4:
       case OperationCode.Conv_Ovf_I8:
       case OperationCode.Conv_Ovf_U8:
         break;
       case OperationCode.Refanyval:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Ckfinite:
         break;
       case OperationCode.Mkrefany:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Ldtoken:
         value = this.GetRuntimeHandleFromToken(memReader.ReadUInt32());
         break;
       case OperationCode.Conv_U2:
       case OperationCode.Conv_U1:
       case OperationCode.Conv_I:
       case OperationCode.Conv_Ovf_I:
       case OperationCode.Conv_Ovf_U:
       case OperationCode.Add_Ovf:
       case OperationCode.Add_Ovf_Un:
       case OperationCode.Mul_Ovf:
       case OperationCode.Mul_Ovf_Un:
       case OperationCode.Sub_Ovf:
       case OperationCode.Sub_Ovf_Un:
       case OperationCode.Endfinally:
         break;
       case OperationCode.Leave: {
           uint leaveOffset = (uint)(memReader.Offset + 4 + memReader.ReadInt32());
           if (leaveOffset >= this.EndOfMethodOffset) {
             //  Error...
           }
           value = leaveOffset;
         }
         break;
       case OperationCode.Leave_S: {
           uint leaveOffset = (uint)(memReader.Offset + 1 + memReader.ReadSByte());
           if (leaveOffset >= this.EndOfMethodOffset) {
             //  Error...
           }
           value = leaveOffset;
         }
         break;
       case OperationCode.Stind_I:
       case OperationCode.Conv_U:
       case OperationCode.Arglist:
       case OperationCode.Ceq:
       case OperationCode.Cgt:
       case OperationCode.Cgt_Un:
       case OperationCode.Clt:
       case OperationCode.Clt_Un:
         break;
       case OperationCode.Ldftn:
       case OperationCode.Ldvirtftn:
         value = this.GetMethod(memReader.ReadUInt32());
         break;
       case OperationCode.Ldarg:
       case OperationCode.Ldarga:
       case OperationCode.Starg:
         value = this.GetParameter(memReader.ReadUInt16());
         break;
       case OperationCode.Ldloc:
       case OperationCode.Ldloca:
       case OperationCode.Stloc:
         value = this.GetLocal(memReader.ReadUInt16());
         break;
       case OperationCode.Localloc:
         value = PointerType.GetPointerType(this.PEFileToObjectModel.PlatformType.SystemVoid, this.PEFileToObjectModel.InternFactory);
         break;
       case OperationCode.Endfilter:
         break;
       case OperationCode.Unaligned_:
         value = memReader.ReadByte();
         break;
       case OperationCode.Volatile_:
       case OperationCode.Tail_:
         break;
       case OperationCode.Initobj:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Constrained_:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Cpblk:
       case OperationCode.Initblk:
         break;
       case OperationCode.No_:
         value = (OperationCheckFlags)memReader.ReadByte();
         break;
       case OperationCode.Rethrow:
         break;
       case OperationCode.Sizeof:
         value = this.GetType(memReader.ReadUInt32());
         break;
       case OperationCode.Refanytype:
       case OperationCode.Readonly_:
         break;
       default:
         this.PEFileToObjectModel.PEFileReader.ErrorContainer.AddILError(this.MethodDefinition, offset, MetadataReaderErrorKind.UnknownILInstruction);
         break;
     }
     instrList[instructionNumber++] = new CilInstruction(cilOpCode, document, offset, value);
   }
   this.MethodBody.SetCilInstructions(instrList);
   return true;
 }
 internal IMetadataConstant GetDefaultValue(
   MetadataObject metadataObject
 ) {
   uint constRowId = this.PEFileReader.ConstantTable.GetConstantRowId(metadataObject.TokenValue);
   if (constRowId == 0)
     return Dummy.Constant;
   ConstantRow constRow = this.PEFileReader.ConstantTable[constRowId];
   MemoryBlock constValueMemoryBlock = this.PEFileReader.BlobStream.GetMemoryBlockAt(constRow.Value);
   MemoryReader memoryReader = new MemoryReader(constValueMemoryBlock);
   switch (constRow.Type) {
     case ElementType.Boolean: {
         byte val = memoryReader.ReadByte();
         return new ConstantExpression(this.PlatformType.SystemBoolean, val != 0);
       }
     case ElementType.Char:
       return new ConstantExpression(this.PlatformType.SystemChar, memoryReader.ReadChar());
     case ElementType.Int8:
       return new ConstantExpression(this.PlatformType.SystemInt8, memoryReader.ReadSByte());
     case ElementType.Int16:
       return new ConstantExpression(this.PlatformType.SystemInt16, memoryReader.ReadInt16());
     case ElementType.Int32:
       return new ConstantExpression(this.PlatformType.SystemInt32, memoryReader.ReadInt32());
     case ElementType.Int64:
       return new ConstantExpression(this.PlatformType.SystemInt64, memoryReader.ReadInt64());
     case ElementType.UInt8:
       return new ConstantExpression(this.PlatformType.SystemUInt8, memoryReader.ReadByte());
     case ElementType.UInt16:
       return new ConstantExpression(this.PlatformType.SystemUInt16, memoryReader.ReadUInt16());
     case ElementType.UInt32:
       return new ConstantExpression(this.PlatformType.SystemUInt32, memoryReader.ReadUInt32());
     case ElementType.UInt64:
       return new ConstantExpression(this.PlatformType.SystemUInt64, memoryReader.ReadUInt64());
     case ElementType.Single:
       return new ConstantExpression(this.PlatformType.SystemFloat32, memoryReader.ReadSingle());
     case ElementType.Double:
       return new ConstantExpression(this.PlatformType.SystemFloat64, memoryReader.ReadDouble());
     case ElementType.String: {
         int byteLen = memoryReader.Length;
         string/*?*/ value;
         if (byteLen == -1) {
           value = null;
         } else if (byteLen == 0) {
           value = string.Empty;
         } else {
           value = memoryReader.ReadUTF16WithSize(byteLen);
         }
         return new ConstantExpression(this.PlatformType.SystemString, value);
       }
     case ElementType.Class:
       return new ConstantExpression(this.PlatformType.SystemObject, null);
   }
   //  MDError...
   return Dummy.Constant;
 }