C# TracingILGenerator.EmitLdc_I4_0方法代码示例

		/// <summary>
		///		Emits 'for' statement on current IL stream.
		/// </summary>
		/// <param name="il">IL generator to be emitted to.</param>
		/// <param name="count">'count' local variable which is <see cref="Int32"/> type and holds maximum loop count.</param>
		/// <param name="bodyEmitter">Delegate to emit for statement body.</param>
		public static void EmitFor( TracingILGenerator il, LocalBuilder count, Action<TracingILGenerator, LocalBuilder> bodyEmitter )
		{
			Contract.Requires( il != null );
			Contract.Requires( count != null );
			Contract.Requires( bodyEmitter != null );

			var i = il.DeclareLocal( typeof( int ), "i" );
			il.EmitLdc_I4_0();
			il.EmitAnyStloc( i );
			var forCond = il.DefineLabel( "FOR_COND" );
			il.EmitBr( forCond );
			var body = il.DefineLabel( "BODY" );
			il.MarkLabel( body );
			bodyEmitter( il, i );
			// increment
			il.EmitAnyLdloc( i );
			il.EmitLdc_I4_1();
			il.EmitAdd();
			il.EmitAnyStloc( i );
			// cond
			il.MarkLabel( forCond );
			il.EmitAnyLdloc( i );
			il.EmitAnyLdloc( count );
			il.EmitBlt( body );
		}

		/// <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 );
			}

		}