C# Statements.BlockStatement類代碼示例

		void ProcessBlock (BlockStatement node)
		{
			for (int i = 0; i < node.Statements.Count - 1; i++)
			{
				var matcher = new UsingMatcher(node.Statements[i], node.Statements[i + 1]);
				if (!matcher.Match ())
					continue;

                if (matcher.VariableReference != null)
                {
                    context.MethodContext.RemoveVariable(matcher.VariableReference);
                }
				if (matcher.RemoveExpression)
				{
					node.Statements.RemoveAt(i); // declaration
					node.Statements.RemoveAt(i); // try
					node.AddStatementAt(i, matcher.Using);
				}
				else
				{
					int index = i + (matcher.HasExpression ? 1 : 0);
					node.Statements.RemoveAt(index); // try
					node.AddStatementAt(index, matcher.Using);
				}
				ProcessBlock(matcher.Using.Body);
			}
		}

		private void TryRemoveConditionVariable(BlockStatement node, Statement statement, int index)
		{
			if (!(statement is ExpressionStatement))
				return;

			var expressionStatement = (ExpressionStatement) statement;
			if (!(expressionStatement.Expression.CodeNodeType == CodeNodeType.BinaryExpression &&
                (expressionStatement.Expression as BinaryExpression).IsAssignmentExpression))
				return;

			var assingExpression = (BinaryExpression) expressionStatement.Expression;

			if (!(assingExpression.Left is VariableReferenceExpression))
				return;

            if (assingExpression.Right is MethodInvocationExpression)
            {
                var variable = assingExpression.Left as VariableReferenceExpression;

                if (variable.Variable.VariableType.Name != TypeCode.Boolean.ToString())
                    return;
            }

			var variableReferenceExpression = (VariableReferenceExpression) assingExpression.Left;
			if (ContainsKey(variableReferenceExpression.Variable))
			{
				methodContext.RemoveVariable(variableReferenceExpression.Variable);
				node.Statements.RemoveAt(index);
			}
		}

 /// <summary>
 /// The entry point for the step.
 /// </summary>
 /// <param name="context">The decompilation context.</param>
 /// <param name="body">The body of the method.</param>
 /// <returns>Returns the updated body of the method.</returns>
 public BlockStatement Process(DecompilationContext context, BlockStatement body)
 {
     MethodSpecificContext methodContext = context.MethodContext;
     foreach (int key in methodContext.Expressions.BlockExpressions.Keys)
     {
         IList<Expression> expressionList = methodContext.Expressions.BlockExpressions[key];
         Code lastInstructionCode = methodContext.ControlFlowGraph.InstructionToBlockMapping[key].Last.OpCode.Code;
         bool endsWithConditionalJump = lastInstructionCode == Code.Brtrue || lastInstructionCode == Code.Brtrue_S ||
                                        lastInstructionCode == Code.Brfalse || lastInstructionCode == Code.Brfalse_S;
         for (int i = 0; i < expressionList.Count; i++)
         {
             expressionList[i] = (Expression)Visit(expressionList[i]);
         }
         if (endsWithConditionalJump)
         {
             expressionList[expressionList.Count - 1] = (Expression)
                 FixBranchingExpression(expressionList[expressionList.Count - 1], methodContext.ControlFlowGraph.InstructionToBlockMapping[key].Last);
         }
         //if (lastInstructionCode == Code.Switch)
         //{
         //    //the type of this expression is needed if the switch instruction causes IrregularSwitchLC
         //    //so that correct expressions can be produced for case's conditions
         //    //Expression lastExpression = expressionList[expressionList.Count - 1];
         //}
     }
     return body;
 }

		public BlockStatement Process(DecompilationContext context, BlockStatement body)
		{
			MethodDefinition method = context.MethodContext.Method;
			if (method.Name == "Finalize" && method.IsVirtual)
			{
				if (body.Statements.Count == 1 && body.Statements[0] is TryStatement)
				{
					TryStatement tryFinally = body.Statements[0] as TryStatement;

					if (tryFinally.Finally != null && tryFinally.Finally.Body.Statements.Count == 1 && tryFinally.Finally.Body.Statements[0] is ExpressionStatement)
					{
						ExpressionStatement finallyStatementExpressionStatement = tryFinally.Finally.Body.Statements[0] as ExpressionStatement;

						if (finallyStatementExpressionStatement.Expression is MethodInvocationExpression)
						{
							MethodDefinition baseDestructor = (finallyStatementExpressionStatement.Expression as MethodInvocationExpression).MethodExpression.MethodDefinition;

							if (baseDestructor != null)
							{
								if (baseDestructor.Name == "Finalize" && baseDestructor.DeclaringType.FullName == method.DeclaringType.BaseType.FullName)
								{
									context.MethodContext.IsDestructor = true;
									context.MethodContext.DestructorStatements = new BlockStatement() { Statements = tryFinally.Try.Statements };
								}
							}
						}
					}

				}
			}

			return body;
		}

		void ProcessBlock (BlockStatement node)
		{
			for (int i = 0; i < node.Statements.Count - 1; i++)
			{
				ForeachArrayMatcher matcher = new ForeachArrayMatcher(node.Statements[i], node.Statements[i + 1], this.context.MethodContext);
				if (!matcher.Match())
				{
					continue;
				}

				if (CheckForIndexUsages(matcher))
				{
					continue;
				}

				context.MethodContext.RemoveVariable(matcher.Incrementor);
				if (matcher.CurrentVariable != null)
				{
					context.MethodContext.RemoveVariable(matcher.CurrentVariable);
				}

				node.Statements.RemoveAt(i);
				node.Statements.RemoveAt(i);
				node.AddStatementAt(i, matcher.Foreach);
				ProcessBlock(matcher.Foreach.Body);
			}
		}

 public BlockStatement Process(DecompilationContext context, BlockStatement body)
 {
     this.context = context;
     this.typeSystem = context.MethodContext.Method.Module.TypeSystem;
     InsertTopLevelParameterAssignments(body);
     return body;
 }

		public override void VisitBlockStatement (BlockStatement node)
		{
			ProcessBlock (node);

			foreach (var statement in node.Statements)
				Visit (statement);
		}

 public ForStatement(Expression initializer, Expression condition, Expression increment, BlockStatement body)
     : base(condition)
 {
     this.Initializer = initializer;
     this.Increment = increment;
     this.Body = body;
 }

 public BlockStatement Process(DecompilationContext context, BlockStatement body)
 {
     theRebuilder = new AnonymousDelegateRebuilder(context, body);
     VisitBlockStatement(body);
     theRebuilder.CleanUpVariableCopyAssignments();
     return body;
 }

        public override void VisitBlockStatement(BlockStatement node)
        {
            for (int i = 0; i < node.Statements.Count; i++)
            {
                if (!Match(node.Statements, i))
                    continue;

                // repalce try with lock
                node.Statements.RemoveAt(i);
                node.AddStatementAt(i, Lock);

                //RemoveFlagVariable(i - 1, node, theFlagVariable);

                if (this.lockType == LockType.Simple)
                {
                    node.Statements.RemoveAt(i + 1); //the try
                    node.Statements.RemoveAt(--i); // the second assign
                    node.Statements.RemoveAt(--i); // the first assign
                }
                else // LockType.WithFlag
                {
                    Lock.Body.Statements.RemoveAt(0); // the first assign
                    Lock.Body.Statements.RemoveAt(0); // the second assign
                    Lock.Body.Statements.RemoveAt(0); // the method invoke
                    if(i > 0)
                    {
                        node.Statements.RemoveAt(--i);
                    }
                }
            }

            Visit(node.Statements);
        }

		public BlockStatement Process(DecompilationContext context, BlockStatement block)
		{
            this.typeSystem = context.MethodContext.Method.Module.TypeSystem;
			this.context = context;
            BlockStatement newBlock = (BlockStatement)VisitBlockStatement(block);
            return newBlock;
		}

        protected BlockStatement RunInternal(MethodBody body, BlockStatement block, ILanguage language)
        {
            try
            {
                if (body.Instructions.Count != 0 || body.Method.IsJustDecompileGenerated)
                {
                    foreach (IDecompilationStep step in steps)
                    {
                        if (language != null && language.IsStopped)
                        {
                            break;
                        }

                        block = step.Process(Context, block);
                    }
                }
            }
            finally
            {
                if (Context.MethodContext.IsMethodBodyChanged)
                {
                    body.Method.RefreshBody();
                }
            }

            return block;
        }

 public FilterMethodToBeDecompiled(MethodDefinition method, CatchClause catchClause, DecompilationContext context, BlockStatement block)
 {
     this.Method = method;
     this.CatchClause = catchClause;
     this.Context = context;
     this.Block = block;
 }

		private bool CheckDictionaryIfBody(BlockStatement then)
		{
			/// Check for the pattern
			/// someVariable = new Dictionary<string,int>();
			/// someVariable.Add("SomeString",0);
			/// <moreAdds>
			/// conditionField = someField;
			if (then.Statements.Count < 1)
			{ 
				return false;
			}
			VariableReferenceExpression localDictionaryVariable;
			if (!CheckDictionaryCreation(then.Statements[0], out localDictionaryVariable ))
			{
				return false;
			}
			if (localDictionaryVariable == null)
			{
				// sanity check.
				return false;
			}

			for (int i = 1; i < then.Statements.Count - 1; i++)
			{
				// check push expressions
				if (!CheckDictionaryAdd(then.Statements[i], localDictionaryVariable))
				{
					return false;
				}
			}

			return CheckDictionaryFieldAssignExpression(then.Statements[then.Statements.Count - 1], localDictionaryVariable);
		}

		public BlockStatement Process(DecompilationContext context, BlockStatement body)
		{
			this.typeSystem = context.MethodContext.Method.Module.TypeSystem;
			this.decompiledMethodReturnType = context.MethodContext.Method.ReturnType;
			Visit(body);
			return body;
		}