public override void ExitUsingStatement([NotNull] SBP.UsingStatementContext context)
{
var subStatements = m_scopeStack.Peek().GetSubExpressions();
Expression scopeCode = null;
if (subStatements[0].Type == ProcedureParsingScope.ScopeType.Block)
{
scopeCode = subStatements[0].GetBlockCode(null, null);
}
else
{
scopeCode = subStatements[0].GetOnlyStatementCode();
}
var usingVariable = m_scopeStack.Peek().AddVariable("usingVariable_" + context.Start.Line.ToString(), new TypeReference(typeof(IDisposable)), null, EntryModifiers.Private);
var variableAssignment = m_scopeStack.Peek().UsingVariableAssignment;
var usingVariableAssignment = Expression.Assign(usingVariable.VariableExpression, variableAssignment);
var disposeHelper = typeof(ExecutionHelperMethods).GetMethod(
nameof(ExecutionHelperMethods.DisposeObject));
var usingCode = Expression.TryFinally(
Expression.Block(
usingVariableAssignment,
scopeCode
),
Expression.Call(disposeHelper, m_currentProcedure.ContextReferenceInternal, usingVariable.VariableExpression));
m_scopeStack.Peek().AddStatementCode(usingCode);
var statementBlock = m_scopeStack.Pop();
m_scopeStack.Peek().AddStatementCode(statementBlock.GetBlockCode());
}
public override void EnterUsingStatement([NotNull] SBP.UsingStatementContext context)
{
// Create a sub-scope in case the using statement contains a variable declaraton. That variable
// should only be visible within this statement scope.
m_scopeStack.Push(new ProcedureParsingScope(m_scopeStack.Peek(), "UsingStatement", ProcedureParsingScope.ScopeType.Block));
this.AddEnterStatement(context);
}