EmitBrfalse() public method

Emit 'brfalse' instruction with specified arguments.
public EmitBrfalse ( System target ) : void
target System as target.
return void
コード例 #1
0
		public override void Branch( TracingILGenerator il, Label @else )
		{
			il.TraceWriteLine( "// Brnc->: {0}", this );
			foreach ( var expression in this._expressions )
			{
				expression.LoadValue( il, false );
				il.EmitBrfalse( @else );
			}

			il.TraceWriteLine( "// ->Brnc: {0}", this );
		}
コード例 #2
0
		protected virtual void BranchCore( TracingILGenerator il, Label @else )
		{
			this.LoadValue( il, false );
			il.EmitBrfalse( @else );
		}
コード例 #3
0
ファイル: Emittion.cs プロジェクト: purplecow/msgpack-cli
		/// <summary>
		///		Emits 'foreach' statement on the IL stream.
		/// </summary>
		/// <param name="il">IL generator to be emitted to.</param>
		/// <param name="traits"><see cref="CollectionTraits"/> which contains traits of the iterating collection.</param>
		/// <param name="collection">'collection' argument index.</param>
		/// <param name="bodyEmitter">Delegate to emit body statement.</param>
		public static void EmitForEach( TracingILGenerator il, CollectionTraits traits, LocalBuilder collection, Action<TracingILGenerator, Action> bodyEmitter )
		{
			Contract.Requires( il != null );
			Contract.Requires( collection != null );
			Contract.Requires( bodyEmitter != null );

			var enumerator = il.DeclareLocal( traits.GetEnumeratorMethod.ReturnType, "enumerator" );

			// gets enumerator
			if ( collection.LocalType.IsValueType )
			{
				il.EmitAnyLdloca( collection );
			}
			else
			{
				il.EmitAnyLdloc( collection );
			}

			il.EmitAnyCall( traits.GetEnumeratorMethod );
			il.EmitAnyStloc( enumerator );

			if ( typeof( IDisposable ).IsAssignableFrom( traits.GetEnumeratorMethod.ReturnType ) )
			{
				il.BeginExceptionBlock();
			}

			var startLoop = il.DefineLabel( "START_LOOP" );
			il.MarkLabel( startLoop );
			var endLoop = il.DefineLabel( "END_LOOP" );
			var enumeratorType = traits.GetEnumeratorMethod.ReturnType;
			MethodInfo moveNextMethod = enumeratorType.GetMethod( "MoveNext", Type.EmptyTypes );
			PropertyInfo currentProperty = traits.GetEnumeratorMethod.ReturnType.GetProperty( "Current" );

			if ( moveNextMethod == null )
			{
				moveNextMethod = Metadata._IEnumerator.MoveNext;
			}

			if ( currentProperty == null )
			{
				if ( enumeratorType == typeof( IDictionaryEnumerator ) )
				{
					currentProperty = Metadata._IDictionaryEnumerator.Current;
				}
				else if ( enumeratorType.IsInterface )
				{
					if ( enumeratorType.IsGenericType && enumeratorType.GetGenericTypeDefinition() == typeof( IEnumerator<> ) )
					{
						currentProperty = typeof( IEnumerator<> ).MakeGenericType( traits.ElementType ).GetProperty( "Current" );
					}
					else
					{
						currentProperty = Metadata._IEnumerator.Current;
					}
				}
			}

			Contract.Assert( currentProperty != null, enumeratorType.ToString() );

			// iterates
			if ( traits.GetEnumeratorMethod.ReturnType.IsValueType )
			{
				il.EmitAnyLdloca( enumerator );
			}
			else
			{
				il.EmitAnyLdloc( enumerator );
			}

			il.EmitAnyCall( moveNextMethod );
			il.EmitBrfalse( endLoop );

			bodyEmitter(
				il,
				() =>
				{
					if ( traits.GetEnumeratorMethod.ReturnType.IsValueType )
					{
						il.EmitAnyLdloca( enumerator );
					}
					else
					{
						il.EmitAnyLdloc( enumerator );
					}
					il.EmitGetProperty( currentProperty );
				}
			);

			il.EmitBr( startLoop );
			il.MarkLabel( endLoop );

			// Dispose
			if ( typeof( IDisposable ).IsAssignableFrom( traits.GetEnumeratorMethod.ReturnType ) )
			{
				il.BeginFinallyBlock();

				if ( traits.GetEnumeratorMethod.ReturnType.IsValueType )
				{
					var disposeMethod = traits.GetEnumeratorMethod.ReturnType.GetMethod( "Dispose" );
					if ( disposeMethod != null && disposeMethod.GetParameters().Length == 0 && disposeMethod.ReturnType == typeof( void ) )
					{
						il.EmitAnyLdloca( enumerator );
						il.EmitAnyCall( disposeMethod );
					}
					else
					{
						il.EmitAnyLdloc( enumerator );
						il.EmitBox( traits.GetEnumeratorMethod.ReturnType );
						il.EmitAnyCall( Metadata._IDisposable.Dispose );
					}
				}
				else
				{
					il.EmitAnyLdloc( enumerator );
					il.EmitAnyCall( Metadata._IDisposable.Dispose );
				}

				il.EndExceptionBlock();
			}
		}
コード例 #4
0
		private static void BranchWithOperationResult( ILConstruct input, Action<TracingILGenerator, ILConstruct> operation, TracingILGenerator il, Label @else )
		{
			operation( il, input );
			il.EmitBrfalse( @else );
		}