public override void VisitExpressionStatement(ExpressionStatement node)
{
if (!node.IsAssignmentStatement())
{
return;
}
BinaryExpression assignExpression = node.Expression as BinaryExpression;
if(assignExpression.Left.CodeNodeType != CodeNodeType.VariableReferenceExpression ||
assignExpression.Right.CodeNodeType != CodeNodeType.FieldReferenceExpression)
{
return;
}
FieldReferenceExpression targetFieldRefExpression = assignExpression.Right as FieldReferenceExpression;
if(targetFieldRefExpression.Target == null ||
targetFieldRefExpression.Target.CodeNodeType != CodeNodeType.FieldReferenceExpression ||
targetFieldRefExpression.Field.Name != "Target")
{
return;
}
FieldDefinition callSiteField = (targetFieldRefExpression.Target as FieldReferenceExpression).Field.Resolve();
CallSiteInfo callSiteInfo;
if(callSiteField == null || !fieldToCallSiteInfoMap.TryGetValue(callSiteField, out callSiteInfo))
{
return;
}
variableToCallSiteInfoMap.Add((assignExpression.Left as VariableReferenceExpression).Variable, callSiteInfo);
statementsToRemove.Add(node);
}
public override void VisitExpressionStatement(ExpressionStatement node)
{
if (node.IsAssignmentStatement() && node.Parent.CodeNodeType == CodeNodeType.BlockStatement)
{
BinaryExpression assignment = node.Expression as BinaryExpression;
if (assignment.Left.CodeNodeType == CodeNodeType.VariableReferenceExpression)
{
Visit(assignment.Right);
AddDefinition((assignment.Left as VariableReferenceExpression).Variable.Resolve(), node);
return;
}
}
base.VisitExpressionStatement(node);
}
private bool CheckTheInitializer(ExpressionStatement statement, out VariableReference forVariable)
{
forVariable = null;
return statement != null && statement.IsAssignmentStatement() && TryGetAssignedVariable(statement, out forVariable);
}
private bool CheckVariableInitialization(ExpressionStatement node)
{
if (!node.IsAssignmentStatement())
{
return false;
}
BinaryExpression theAssignExpression = node.Expression as BinaryExpression;
if (theAssignExpression.Left.CodeNodeType != CodeNodeType.VariableReferenceExpression)
{
return false;
}
Expression value = theAssignExpression.Right;
if (value.CodeNodeType == CodeNodeType.CastExpression)
{
value = (value as CastExpression).Expression;
}
if ((value.CodeNodeType != CodeNodeType.LiteralExpression || (value as LiteralExpression).Value != null) &&
(value.CodeNodeType != CodeNodeType.FieldReferenceExpression))
{
return false;
}
if (value.CodeNodeType == CodeNodeType.FieldReferenceExpression)
{
FieldReferenceExpression fieldReferenceExpression = value as FieldReferenceExpression;
TypeDefinition fieldType = fieldReferenceExpression.ExpressionType.Resolve();
if (fieldType == null || fieldType.BaseType == null || fieldType.BaseType.FullName != "System.MulticastDelegate")
{
return false;
}
// Slow checks
FieldDefinition fieldDef = fieldReferenceExpression.Field.Resolve();
if ((fieldDef.DeclaringType != this.context.MethodContext.Method.DeclaringType &&
!fieldDef.DeclaringType.IsNestedIn(this.context.MethodContext.Method.DeclaringType)) ||
!fieldDef.DeclaringType.IsCompilerGenerated())
{
return false;
}
}
initializationsToRemove[(theAssignExpression.Left as VariableReferenceExpression).Variable] = node;
return true;
}
public override void VisitExpressionStatement(ExpressionStatement node)
{
if (node.IsAssignmentStatement() && CheckBinaryExpression(node.Expression as BinaryExpression))
{
statementsToRemove.Add(node);
}
else
{
base.VisitExpressionStatement(node);
}
}
public override ICodeNode VisitExpressionStatement(ExpressionStatement node)
{
if (node.IsAssignmentStatement())
{
BinaryExpression assignExpression = node.Expression as BinaryExpression;
if (assignExpression.Left.CodeNodeType == CodeNodeType.VariableReferenceExpression &&
assignExpression.Right.CodeNodeType == CodeNodeType.FieldReferenceExpression)
{
FieldDefinition fieldDef = (assignExpression.Right as FieldReferenceExpression).Field.Resolve();
if (fieldDef != null && fieldToCallSiteInfoMap.ContainsKey(fieldDef))
{
return null;
}
}
}
return base.VisitExpressionStatement(node);
}
private bool CheckVariableInitialization(ExpressionStatement node)
{
if (!node.IsAssignmentStatement())
{
return false;
}
BinaryExpression theAssignExpression = node.Expression as BinaryExpression;
if (theAssignExpression.Left.CodeNodeType != CodeNodeType.VariableReferenceExpression)
{
return false;
}
Expression value = theAssignExpression.Right;
if (value.CodeNodeType == CodeNodeType.CastExpression)
{
value = (value as CastExpression).Expression;
}
if (value.CodeNodeType != CodeNodeType.LiteralExpression || (value as LiteralExpression).Value != null)
{
return false;
}
initializationsToRemove[(theAssignExpression.Left as VariableReferenceExpression).Variable] = node;
return true;
}
