C# TracingILGenerator.BeginCatchBlock方法代码示例

		/// <summary>
		/// Emits the deserialize value.
		/// </summary>
		/// <param name="emitter">The emitter.</param>
		/// <param name="il">The il generator.</param>
		/// <param name="unpackerArgumentIndex">Index of the unpacker argument.</param>
		/// <param name="value">The value local variable which stores unpacked value.</param>
		/// <param name="targetType">The type of deserialzing type.</param>
		/// <param name="member">The metadata for nil implication. Specify <c>null</c> if nil implication is not needed.</param>
		/// <param name="memberName">The name of the member.</param>
		/// <param name="endOfDeserialization">The end of deserialization label for nil implication.</param>
		/// <param name="localHolder">The <see cref="LocalVariableHolder"/> which holds shared local variable information.</param>
		private static void EmitDeserializeValueCore( SerializerEmitter emitter, TracingILGenerator il, int unpackerArgumentIndex, LocalBuilder value, Type targetType, SerializingMember? member, string memberName, Label endOfDeserialization, LocalVariableHolder localHolder )
		{
			var directUnpacking = Metadata._Unpacker.GetDirectReadMethod( value.LocalType );
			if ( directUnpacking != null && ( member == null || !UnpackHelpers.IsReadOnlyAppendableCollectionMember( member.Value.Member ) ) )
			{
				var isSuccess = localHolder.IsDeserializationSucceeded;
				il.EmitLdc_I4_0();
				il.EmitAnyStloc( isSuccess );

				il.BeginExceptionBlock();
				il.EmitAnyLdarg( unpackerArgumentIndex );
				il.EmitAnyLdloca( value );
				il.EmitAnyCall( directUnpacking );
				il.EmitAnyStloc( isSuccess );
				il.BeginCatchBlock( typeof( MessageTypeException ) );
				var ex = localHolder.GetCatchedException( typeof( MessageTypeException ) );
				il.EmitAnyStloc( ex );
				il.EmitTypeOf( targetType );
				il.EmitLdstr( memberName );
				il.EmitAnyLdloc( ex );
				il.EmitAnyCall( SerializationExceptions.NewFailedToDeserializeMemberMethod );
				il.EmitThrow();
				il.EndExceptionBlock();
				var endIf0 = il.DefineLabel( "END_IF" );
				il.EmitAnyLdloc( isSuccess );
				il.EmitBrtrue_S( endIf0 );
				il.EmitAnyCall( SerializationExceptions.NewUnexpectedEndOfStreamMethod );
				il.EmitThrow();
				il.MarkLabel( endIf0 );
				if ( member != null )
				{
					// If null, nil implication is NOT needed.
					EmitNilImplicationForPrimitive( il, member.Value, value, endOfDeserialization );
				}
			}
			else
			{
				EmitGeneralRead( il, unpackerArgumentIndex );
				if ( member != null )
				{
					// If null, nil implication is NOT needed.
					EmitNilImplication(
						il,
						unpackerArgumentIndex,
						member.Value.Contract.Name,
						member.Value.Contract.NilImplication,
						endOfDeserialization,
						localHolder
					);
				}

				var thenIffCollection = il.DefineLabel( "THEN_IF_COLLECTION" );
				var endIfCollection = il.DefineLabel( "END_IF_COLLECTION" );

				/*
				 *	if( !unpacker.IsArrayHeader && !unpacker.IsMapHeader )
				 *	{
				 *		value = GET_SERIALIZER().UnpackFrom( unpacker );
				 *	}
				 *	else
				 *	{
				 *		using( var subtreeUnpacker = unpacker.ReadSubtree() )
				 *		{
				 *			value = GET_SERIALIZER().UnpackFrom( subtreeUnpacker );
				 *		}
				 *	}
				 */

				il.EmitAnyLdarg( unpackerArgumentIndex );
				il.EmitGetProperty( Metadata._Unpacker.IsArrayHeader );
				il.EmitAnyLdarg( unpackerArgumentIndex );
				il.EmitGetProperty( Metadata._Unpacker.IsMapHeader );
				il.EmitOr();
				il.EmitBrtrue_S( thenIffCollection );
				EmitUnpackFrom( emitter, il, value, unpackerArgumentIndex );
				il.EmitBr_S( endIfCollection );
				var subtreeUnpacker = localHolder.SubtreeUnpacker;
				il.MarkLabel( thenIffCollection );
				EmitUnpackerBeginReadSubtree( il, unpackerArgumentIndex, subtreeUnpacker );
				EmitUnpackFrom( emitter, il, value, subtreeUnpacker );
				EmitUnpackerEndReadSubtree( il, subtreeUnpacker );
				il.MarkLabel( endIfCollection );
			}

		}

		/// <summary>
		/// Emits gets <see cref="Unpacker.ItemsCount"/> with exception handling.
		/// Note that final state is the value is pushed top of the evaluation stack.
		/// </summary>
		/// <param name="il">IL generator.</param>
		/// <param name="unpackerArgumentIndex">Argument index of the unpacker.</param>
		/// <param name="localHolder">The <see cref="LocalVariableHolder"/> which holds shared local variable information.</param>
		public static void EmitGetUnpackerItemsCountAsInt32( TracingILGenerator il, int unpackerArgumentIndex, LocalVariableHolder localHolder )
		{
			Contract.Requires( il != null );
			Contract.Requires( unpackerArgumentIndex >= 0 );

			/*
			 *	long rawItemsCount;
			 *	try
			 *	{
			 *		rawItemsCount = unpacker.ItemsCount;
			 *	}
			 *	catch ( InvalidOperationException ex )
			 *	{
			 *		throw SerializationExceptions.NewIsIncorrectStream( ex );
			 *	}
			 * 
			 *	if( rawItemsCount > Int32.MaxValue )
			 *	{
			 *		throw SerializationException.NewIsTooLargeCollection(); 
			 *	}
			 * 
			 *	... unchecked( ( int )rawItemsCount );
			 */
			il.EmitAnyLdloca( localHolder.RawItemsCount );
			il.EmitInitobj( typeof( long ) );
			il.BeginExceptionBlock();
			il.EmitAnyLdarg( unpackerArgumentIndex );
			il.EmitGetProperty( Metadata._Unpacker.ItemsCount );
			il.EmitAnyStloc( localHolder.RawItemsCount );
			il.BeginCatchBlock( typeof( InvalidOperationException ) );
			il.EmitAnyCall( SerializationExceptions.NewIsIncorrectStreamMethod );
			il.EmitThrow();
			il.EndExceptionBlock();

			il.EmitAnyLdloc( localHolder.RawItemsCount );
			il.EmitLdc_I8( Int32.MaxValue );
			var endIf = il.DefineLabel();
			il.EmitBle_S( endIf );
			il.EmitAnyCall( SerializationExceptions.NewIsTooLargeCollectionMethod );
			il.EmitThrow();
			il.MarkLabel( endIf );
			il.EmitAnyLdloc( localHolder.RawItemsCount );
			il.EmitConv_I4();
		}