public CatchClause(BlockStatement body, TypeReference type, VariableDeclarationExpression variable, Statement filter = null)
{
this.Body = body;
this.Type = type;
this.Variable = variable;
this.Filter = filter;
}
public ArrayVariableDeclarationExpression(VariableDeclarationExpression variable, TypeReference arrayType, ExpressionCollection dimensions, bool hasInitializer, IEnumerable<Instruction> instructions)
: base(instructions)
{
this.Variable = variable;
this.ArrayType = arrayType;
this.Dimensions = dimensions;
this.HasInitializer = hasInitializer;
}
public ArrayVariableDeclarationExpression(VariableDeclarationExpression variable, TypeReference arrayType, ExpressionCollection dimensions, bool hasInitializer, IEnumerable <Instruction> instructions)
: base(instructions)
{
this.Variable = variable;
this.ArrayType = arrayType;
this.Dimensions = dimensions;
this.HasInitializer = hasInitializer;
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
if (node.Variable == variable)
{
found = true;
return;
}
base.VisitVariableDeclarationExpression(node);
}
public ArrayVariableDeclarationExpression(VariableDeclarationExpression variable, TypeReference arrayType, ExpressionCollection dimensions, bool hasInitializer, IEnumerable <Instruction> instructions)
{
base(instructions);
this.set_Variable(variable);
this.set_ArrayType(arrayType);
this.set_Dimensions(dimensions);
this.set_HasInitializer(hasInitializer);
return;
}
public override bool Equals(Expression other)
{
if (!(other is VariableDeclarationExpression))
{
return(false);
}
VariableDeclarationExpression otherVar = other as VariableDeclarationExpression;
return(this.Variable.Resolve() == otherVar.Variable.Resolve());
}
public ForEachStatement(VariableDeclarationExpression variable, Expression expression, BlockStatement body, IEnumerable<Instruction> conditionInstructions,
IEnumerable<Instruction> finallyInstructions)
{
this.Variable = variable;
this.Collection = expression;
this.Body = body;
this.mappedConditionInstructions = new List<Instruction>();
if (conditionInstructions != null)
{
this.mappedConditionInstructions.AddRange(conditionInstructions);
this.mappedConditionInstructions.Sort((x, y) => x.Offset.CompareTo(y.Offset));
}
this.mappedFinallyInstructions = new List<Instruction>();
if (finallyInstructions != null)
{
this.mappedFinallyInstructions.AddRange(finallyInstructions);
this.mappedFinallyInstructions.Sort((x, y) => x.Offset.CompareTo(y.Offset));
}
}
private void GenerateForeachStatement()
{
if (foreachVariable == null)
{
foreachVariable = new VariableDefinition(foreachVariableType);
foreachVariableInstructions.Clear();
this.methodContext.VariablesToRename.Add(foreachVariable);
}
VariableDeclarationExpression vd = new VariableDeclarationExpression(foreachVariable, foreachVariableInstructions);
Expression foreachCollectionExpression = foreachCollection.CloneAndAttachInstructions(foreachCollectionInstructions);
if (foreachCollectionExpression is BaseReferenceExpression)
{
foreachCollectionExpression = new ThisReferenceExpression(this.methodContext.Method.DeclaringType, foreachCollectionExpression.UnderlyingSameMethodInstructions);
}
@foreach = new ForEachStatement(vd, foreachCollectionExpression, foreachBody, foreachConditionInstructions, theTry.Finally.UnderlyingSameMethodInstructions);
GetCurrentFixer gcf = new GetCurrentFixer(theEnumerator, foreachVariable);
gcf.Visit(@foreach);
IsEnumeratorUsedVisitor enumeratorUsedVisitor = new IsEnumeratorUsedVisitor(theEnumerator);
enumeratorUsedVisitor.Visit(@foreach);
isEnumeratorUsedInsideForEach = enumeratorUsedVisitor.IsEnumeratorUsed;
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
TypesDependingOn.UnionWith(Utilities.GetTypeReferenceTypesDepedningOn(node.Variable.VariableType));
base.VisitVariableDeclarationExpression(node);
}
/*
* The following pattern matches BlockStatements with similar content
* {
* stackVariable6 = exception_0 as Exception;
* if (stackVariable6 != null)
* {
* ProjectData.SetProjectError(stackVariable6);
* ex = stackVariable6;
* stackVariable15 = Program.Bool() && b is int;
* }
* else
* {
* stackVariable15 = false;
* }
* stackVariable15;
* }
* - stackVariable6 = exception_0 as Exception; - the VariableDeclarationExpression is build using this variable reference
* - Program.Bool() && b is int - The filter expression
* - ex = stackVariable6; - Not required line, if present the variable reference is used to build the VariableDeclarationExpression
* - ProjectData.SetProjectError(stackVariable6); - Not required line. It is generated by the VB compiler. It could be after ex = stackVariable6;
*/
public static bool TryMatch(BlockStatement filter, out VariableDeclarationExpression variableDeclaration, out Expression filterExpression)
{
variableDeclaration = null;
filterExpression = null;
if (!TryMatchVariableDeclaration(filter, out variableDeclaration))
{
return false;
}
// Save cast of the exception
// If-else statement for the filter expression
// Variable reference of the result of the filter block
if (filter.Statements.Count != 3)
{
return false;
}
IfStatement ifStatement = filter.Statements[1] as IfStatement;
if (ifStatement == null)
{
return false;
}
BlockStatement exceptionAssignmentBlock = null;
BlockStatement negativeFilterResultAssignmentBlock = null;
if ((ifStatement.Condition as BinaryExpression).Operator == BinaryOperator.ValueInequality)
{
exceptionAssignmentBlock = ifStatement.Then;
negativeFilterResultAssignmentBlock = ifStatement.Else;
}
else
{
exceptionAssignmentBlock = ifStatement.Else;
negativeFilterResultAssignmentBlock = ifStatement.Then;
}
ExpressionStatement exceptionAssignmentStatement = null;
ExpressionStatement methodInvocationStatement = null;
if ((exceptionAssignmentBlock.Statements.Count != 1 && exceptionAssignmentBlock.Statements.Count != 2 && exceptionAssignmentBlock.Statements.Count != 3) ||
negativeFilterResultAssignmentBlock.Statements.Count != 1)
{
return false;
}
if (exceptionAssignmentBlock.Statements.Count == 2)
{
ExpressionStatement firstThenStatement = exceptionAssignmentBlock.Statements[0] as ExpressionStatement;
if (firstThenStatement == null)
{
return false;
}
if (firstThenStatement.Expression.CodeNodeType == CodeNodeType.BinaryExpression)
{
exceptionAssignmentStatement = firstThenStatement;
}
else if (firstThenStatement.Expression.CodeNodeType == CodeNodeType.MethodInvocationExpression)
{
methodInvocationStatement = firstThenStatement;
}
else
{
return false;
}
}
else if (exceptionAssignmentBlock.Statements.Count == 3)
{
ExpressionStatement firstThenStatement = exceptionAssignmentBlock.Statements[0] as ExpressionStatement;
ExpressionStatement secondThenStatement = exceptionAssignmentBlock.Statements[1] as ExpressionStatement;
if (firstThenStatement == null || secondThenStatement == null)
{
return false;
}
if (firstThenStatement.Expression.CodeNodeType == CodeNodeType.BinaryExpression &&
secondThenStatement.Expression.CodeNodeType == CodeNodeType.MethodInvocationExpression)
{
exceptionAssignmentStatement = firstThenStatement;
methodInvocationStatement = secondThenStatement;
}
else if (firstThenStatement.Expression.CodeNodeType == CodeNodeType.MethodInvocationExpression &&
secondThenStatement.Expression.CodeNodeType == CodeNodeType.BinaryExpression)
{
methodInvocationStatement = firstThenStatement;
exceptionAssignmentStatement = secondThenStatement;
}
else
{
return false;
}
}
if (exceptionAssignmentStatement != null)
{
BinaryExpression exceptionAssignment = exceptionAssignmentStatement.Expression as BinaryExpression;
if (exceptionAssignment == null || !exceptionAssignment.IsAssignmentExpression ||
exceptionAssignment.ExpressionType.FullName != variableDeclaration.ExpressionType.FullName)
{
return false;
}
VariableReferenceExpression left = exceptionAssignment.Left as VariableReferenceExpression;
VariableReferenceExpression right = exceptionAssignment.Right as VariableReferenceExpression;
if (left == null || right == null)
{
return false;
}
}
if (methodInvocationStatement != null)
{
MethodInvocationExpression methodInvocation = methodInvocationStatement.Expression as MethodInvocationExpression;
if (methodInvocation == null ||
methodInvocation.MethodExpression.Method.FullName != "System.Void Microsoft.VisualBasic.CompilerServices.ProjectData::SetProjectError(System.Exception)")
{
return false;
}
}
ExpressionStatement lastExpressionStatement = filter.Statements[2] as ExpressionStatement;
if (lastExpressionStatement == null)
{
return false;
}
VariableReferenceExpression lastExpression = lastExpressionStatement.Expression as VariableReferenceExpression;
if (lastExpression == null)
{
return false;
}
if (!TryMatchFilterExpression(ifStatement, variableDeclaration.Variable.VariableType, lastExpression, out filterExpression))
{
return false;
}
return true;
}
private static bool TryMatchVariableDeclaration(BlockStatement filter, out VariableDeclarationExpression variableDeclaration)
{
variableDeclaration = null;
ExpressionStatement firstExpressionStatement = filter.Statements[0] as ExpressionStatement;
if (firstExpressionStatement == null)
{
return false;
}
BinaryExpression binaryExpression = firstExpressionStatement.Expression as BinaryExpression;
if (binaryExpression == null || !binaryExpression.IsAssignmentExpression)
{
return false;
}
VariableReferenceExpression variableReference = binaryExpression.Left as VariableReferenceExpression;
if (variableReference == null)
{
return false;
}
SafeCastExpression safeCast = binaryExpression.Right as SafeCastExpression;
if (safeCast == null)
{
return false;
}
IfStatement ifStatement = filter.Statements[1] as IfStatement;
if (ifStatement == null)
{
return false;
}
BinaryExpression condition = ifStatement.Condition as BinaryExpression;
if (condition == null)
{
return false;
}
VariableReferenceExpression conditionLeft = condition.Left as VariableReferenceExpression;
if (conditionLeft == null)
{
return false;
}
LiteralExpression conditionRight = condition.Right as LiteralExpression;
if (conditionRight == null)
{
return false;
}
if (!conditionLeft.Equals(variableReference) || conditionRight.Value != null ||
(condition.Operator != BinaryOperator.ValueEquality && condition.Operator != BinaryOperator.ValueInequality))
{
return false;
}
// At this point we know the type of the exception
VariableDefinition variableDefinition = variableReference.Variable.Resolve();
IEnumerable<Instruction> instructions = variableReference.MappedInstructions;
BlockStatement exceptionVariableAssignmentBlock;
if (condition.Operator == BinaryOperator.ValueInequality)
{
exceptionVariableAssignmentBlock = ifStatement.Then;
}
else // BinaryOperator.ValueEquality
{
exceptionVariableAssignmentBlock = ifStatement.Else;
}
ExpressionStatement expressionStatement = exceptionVariableAssignmentBlock.Statements[0] as ExpressionStatement;
if (!TryGetVariableDeclaration(expressionStatement, variableReference, ref variableDefinition, ref instructions))
{
if (exceptionVariableAssignmentBlock.Statements.Count >= 2)
{
expressionStatement = exceptionVariableAssignmentBlock.Statements[1] as ExpressionStatement;
TryGetVariableDeclaration(expressionStatement, variableReference, ref variableDefinition, ref instructions);
}
}
variableDeclaration = new VariableDeclarationExpression(variableDefinition, instructions);
return true;
}
public virtual void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
}
public override Expression CloneExpressionOnly()
{
VariableDeclarationExpression result = new VariableDeclarationExpression(Variable, null);
return result;
}
public override ICodeNode VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
this.decompilationContext.MethodContext.VariablesToRename.Add(node.Variable);
return base.VisitVariableDeclarationExpression(node);
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
if (!methodContext.VariableDefinitionToNameMap.ContainsKey(node.Variable))
{
methodContext.VariableDefinitionToNameMap.Add(node.Variable, node.Variable.Name);
}
if (state == State.SearchForPossibleNames)
{
SuggestNameForVariable(node.Variable);
}
else if (state == State.RenameVariables)
{
TryRenameVariable(node.Variable);
}
base.VisitVariableDeclarationExpression(node);
}
private void CreateMethod(CatchClause catchClause, VariableDeclarationExpression variable, out Expression methodInvocationExpression)
{
methodInvocationExpression = null;
BlockStatement filter = catchClause.Filter as BlockStatement;
// Fixes the variable definition in the first statement.
ExpressionStatement firstStatement = filter.Statements.First() as ExpressionStatement;
BinaryExpression assignment = firstStatement.Expression as BinaryExpression;
SafeCastExpression safeCast = assignment.Right as SafeCastExpression;
VariableReferenceExpression variableReference = safeCast.Expression as VariableReferenceExpression;
variableReference.Variable = variable.Variable;
// Replace the variable reference in the last statement with return statement.
ExpressionStatement lastStatement = filter.Statements.Last() as ExpressionStatement;
lastStatement.Expression = new ReturnExpression(lastStatement.Expression, lastStatement.Expression.MappedInstructions);
int methodNumber = this.context.TypeContext.GeneratedFilterMethods.Count + this.methodsToBeDecompiled.Count;
string methodName = string.Format(Constants.JustDecompileGeneratedFilterPattern, methodNumber);
MethodDefinition method = new MethodDefinition(methodName, Mono.Cecil.MethodAttributes.Private, this.context.MethodContext.Method.Module.TypeSystem.Boolean);
method.Body = new MethodBody(method);
// Practically no chance for duplicates, because of decrementing the MaxRID
method.MetadataToken = new MetadataToken(TokenType.Method, MaxRID - (uint)methodNumber);
method.IsStatic = this.context.MethodContext.Method.IsStatic;
method.HasThis = !method.IsStatic;
method.DeclaringType = context.MethodContext.Method.DeclaringType;
method.SemanticsAttributes = MethodSemanticsAttributes.None;
method.IsJustDecompileGenerated = true;
DecompilationContext newContext = new DecompilationContext(CloneAndReplaceMethodBody(this.context.MethodContext, method.Body), this.context.TypeContext);
VariableDefinition variableDefinition = variableReference.Variable.Resolve();
if (!newContext.MethodContext.VariableDefinitionToNameMap.ContainsKey(variableDefinition))
{
newContext.MethodContext.VariableDefinitionToNameMap[variableDefinition] = Constants.JustDecompileGeneratedException;
}
else
{
newContext.MethodContext.VariableDefinitionToNameMap.Add(variableDefinition, Constants.JustDecompileGeneratedException);
}
newContext.MethodContext.VariablesToNotDeclare.Add(variable.Variable);
methodsToBeDecompiled.Add(new FilterMethodToBeDecompiled(method, catchClause, newContext, catchClause.Filter as BlockStatement));
List<Expression> parameters = AddAllParameters(catchClause, method, variable);
methodInvocationExpression = CreateMethodInvocation(method, parameters);
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
if ((node.Variable.VariableType.IsOptionalModifier || node.Variable.VariableType.IsRequiredModifier) &&
!this.isWritingComment)
{
StartWritingComment();
VisitVariableDeclarationExpression(node);
EndWritingComment();
WriteLine();
}
WriteDim();
VariableDefinition variable = node.Variable;
if (variable.VariableType.ContainsAnonymousType())
{
WriteToken(GetVariableName(variable));
}
else
{
base.VisitVariableDeclarationExpression(node);
}
}
private List<Expression> AddAllParameters(CatchClause catchClause, MethodDefinition method, VariableDeclarationExpression variable)
{
List<Expression> methodInvocationArguments = new List<Expression>();
method.Parameters.Add(CreateParameter(Constants.JustDecompileGeneratedException, variable.Variable.VariableType));
methodInvocationArguments.Add(new UnaryExpression(UnaryOperator.AddressReference, new VariableReferenceExpression(variable.Variable, null), null));
if (this.catchClausesUsedVariablesMap.ContainsKey(catchClause))
{
foreach (VariableDefinition variableDefinition in this.catchClausesUsedVariablesMap[catchClause])
{
if (variablesUsedOutsideFilters.Contains(variableDefinition) && variableDefinition != variable.Variable)
{
// If parameter's name is null, it will be ranamed in RenameVariables step.
string parameterName = context.MethodContext.VariablesToRename.Contains(variableDefinition) ? null : variableDefinition.Name;
ParameterDefinition parameter = CreateParameter(parameterName, variableDefinition.VariableType);
if (parameterName == null)
{
if (!catchClausesVariablesToParametersMap.ContainsKey(catchClause))
{
catchClausesVariablesToParametersMap.Add(catchClause, new Dictionary<VariableDefinition, ParameterDefinition>());
}
catchClausesVariablesToParametersMap[catchClause].Add(variableDefinition, parameter);
}
method.Parameters.Add(parameter);
methodInvocationArguments.Add(new UnaryExpression(UnaryOperator.AddressReference, new VariableReferenceExpression(variableDefinition, null), null));
}
}
}
if (this.catchClausesUsedParametersMap.ContainsKey(catchClause))
{
foreach (ParameterDefinition parameterDefinition in this.catchClausesUsedParametersMap[catchClause])
{
method.Parameters.Add(CreateParameter(parameterDefinition.Name, parameterDefinition.ParameterType));
methodInvocationArguments.Add(new UnaryExpression(UnaryOperator.AddressReference, new ArgumentReferenceExpression(parameterDefinition, null), null));
}
}
return methodInvocationArguments;
}
public override ICodeNode VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
TryDiscardVariable(node.Variable);
return node;
}
public override ICodeNode VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
AddReferencedVariable(node.Variable.Resolve());
return node;
}
public override Expression CloneExpressionOnly()
{
VariableDeclarationExpression result = new VariableDeclarationExpression(Variable, null);
return(result);
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
if (this.Language.GetType() != typeof(CSharp))
{
string variableName = GetVariableName(node.Variable);
if (node.Variable.VariableType.ContainsAnonymousType())
{
WriteKeyword(KeyWordWriter.Dim);
WriteSpace();
Write(variableName);
}
else if (node.Variable.Resolve().IsDynamic)
{
WriteDynamicType(node.Variable.VariableType, node.Variable.DynamicPositioningFlags);
WriteSpace();
Write(variableName);
}
else
{
base.VisitVariableDeclarationExpression(node);
}
}
else
{
base.VisitVariableDeclarationExpression(node);
}
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
VariableDefinition variable = node.Variable;
WriteTypeAndName(variable.VariableType, GetVariableName(variable));
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
WriteTypeAndName(node.Variable.VariableType, node.Variable.Name);
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
if (node.Variable == oldVariable)
{
node.Variable = newVariable;
}
}
public override void VisitVariableDeclarationExpression(VariableDeclarationExpression node)
{
RemoveVariable(node.Variable.Resolve());
}