public override JsCatchClause VisitCatchClause(JsCatchClause clause, Tuple <Dictionary <string, string>, HashSet <string> > data)
{
var newData = new Dictionary <string, string>(data.Item1);
var usedNames = new HashSet <string>(data.Item1.Values.Concat(data.Item2));
string newName = _generateName(clause.Identifier, usedNames);
newData.Add(clause.Identifier, newName);
return(JsStatement.Catch(newName, VisitStatement(clause.Body, Tuple.Create(newData, data.Item2))));
}
public void TryCatchFinallyStatementWithCatchOrFinallyOrBothIsCorrectlyOutput()
{
AssertCorrect(JsStatement.Try(JsExpression.Identifier("x"), JsStatement.Catch("e", JsExpression.Identifier("y")), JsExpression.Identifier("z")),
"try {\n\tx;\n}\ncatch (e) {\n\ty;\n}\nfinally {\n\tz;\n}\n");
AssertCorrect(JsStatement.Try(JsExpression.Identifier("x"), JsStatement.Catch("e", JsExpression.Identifier("y")), null),
"try {\n\tx;\n}\ncatch (e) {\n\ty;\n}\n");
AssertCorrect(JsStatement.Try(JsExpression.Identifier("x"), null, JsExpression.Identifier("z")),
"try {\n\tx;\n}\nfinally {\n\tz;\n}\n");
}
public void TryCatchFinallyStatementWithCatchOrFinallyOrBothWorks()
{
AssertCorrect(JsStatement.Try(JsExpression.Identifier("x"), JsStatement.Catch("e", JsExpression.Identifier("y")), JsExpression.Identifier("z")),
"try{x;}catch(e){y;}finally{z;}");
AssertCorrect(JsStatement.Try(JsExpression.Identifier("x"), JsStatement.Catch("e", JsExpression.Identifier("y")), null),
"try{x;}catch(e){y;}");
AssertCorrect(JsStatement.Try(JsExpression.Identifier("x"), null, JsExpression.Identifier("z")),
"try{x;}finally{z;}");
}
private JsBlockStatement ProcessAsyncMethod(JsBlockStatement statement, string stateMachineMethodName, string doFinallyBlocksVariableName, JsVariableDeclaration taskCompletionSource, Func <JsExpression, JsExpression> makeSetResult, Func <JsExpression, JsExpression> makeSetException, Func <JsExpression> getTask, Func <JsExpression, JsExpression, JsExpression> bindToContext)
{
_stateMachineMethodName = stateMachineMethodName;
_doFinallyBlocksVariableName = doFinallyBlocksVariableName;
_makeSetResult = taskCompletionSource != null ? makeSetResult : null;
_needDoFinallyBlocksVariable = new HasAwaitInsideTryWithFinallyVisitor().Analyze(statement);
var result = Process(statement, isIteratorBlock: false, isAsync: true);
var hoistResult = VariableHoistingVisitor.Process(result);
string catchVariable = _allocateTempVariable();
JsStatement body;
if (taskCompletionSource != null && (statement.Statements.Count == 0 || IsNextStatementReachable(statement.Statements[statement.Statements.Count - 1]))) // If we return the task, and if we risk falling out of the original method, we need to add a setResult call.
{
body = JsStatement.Block(hoistResult.Item1.Statements.Concat(new JsStatement[] { makeSetResult(null) }));
}
else
{
body = hoistResult.Item1;
}
if (taskCompletionSource != null)
{
body = JsStatement.Try(body, JsStatement.Catch(catchVariable, JsStatement.Block(makeSetException(JsExpression.Identifier(catchVariable)))), null);
}
IEnumerable <JsVariableDeclaration> declarations = new[] { JsStatement.Declaration(_stateVariableName, JsExpression.Number(0)) };
if (taskCompletionSource != null)
{
declarations = declarations.Concat(new[] { taskCompletionSource });
}
declarations = declarations.Concat(hoistResult.Item2.Select(v => JsStatement.Declaration(v, null)));
if (_needDoFinallyBlocksVariable)
{
body = JsStatement.Block(new[] { JsStatement.Var(_doFinallyBlocksVariableName, JsExpression.True) }.Concat(body is JsBlockStatement ? ((JsBlockStatement)body).Statements : (IEnumerable <JsStatement>) new[] { body }));
}
var stateMachine = JsExpression.FunctionDefinition(new string[0], body);
var boundStateMachine = UsesThisVisitor.Analyze(stateMachine.Body) ? bindToContext(stateMachine, JsExpression.This) : stateMachine;
IEnumerable <JsStatement> stmts = new JsStatement[] { JsStatement.Var(declarations),
JsStatement.Var(stateMachineMethodName, boundStateMachine),
JsExpression.Invocation(JsExpression.Identifier(stateMachineMethodName)) };
if (taskCompletionSource != null)
{
stmts = stmts.Concat(new[] { JsStatement.Return(getTask()) });
}
return(JsStatement.Block(stmts));
}
public override JsCatchClause VisitCatchClause(JsCatchClause clause, IDictionary <string, string> data)
{
IDictionary <string, string> newData;
if (!_renames.TryGetValue(clause, out newData))
{
newData = data;
}
string newName;
if (newData.TryGetValue(clause.Identifier, out newName))
{
return(JsStatement.Catch(newName, VisitStatement(clause.Body, newData)));
}
else
{
return(base.VisitCatchClause(clause, newData));
}
}
private bool HandleTryStatement(JsTryStatement stmt, StackEntry location, ImmutableStack <StackEntry> stack, ImmutableStack <Tuple <string, State> > breakStack, ImmutableStack <Tuple <string, State> > continueStack, State currentState, State returnState, IList <JsStatement> currentBlock, bool isFirstStatement)
{
if (_isIteratorBlock && (FindInterestingConstructsVisitor.Analyze(stmt.GuardedStatement, InterestingConstruct.YieldReturn) || (stmt.Finally != null && stmt.Catch == null && !currentState.FinallyStack.IsEmpty)))
{
if (stmt.Catch != null)
{
throw new InvalidOperationException("Cannot yield return from try with catch");
}
string handlerName = _allocateFinallyHandler();
JsBlockStatement handler;
if (FindInterestingConstructsVisitor.Analyze(stmt.Finally, InterestingConstruct.Label))
{
var inner = ProcessInner(stmt.Finally, breakStack, continueStack, currentState.FinallyStack, currentState.StateValue);
handler = JsStatement.Block(new[] { new JsSetNextStateStatement(inner.Item2) }.Concat(inner.Item1));
handler = new FinalizerRewriter(_stateVariableName, _labelStates).Process(handler);
}
else
{
handler = stmt.Finally;
}
_finallyHandlers.Add(Tuple.Create(handlerName, handler));
var stateAfter = GetStateAfterStatement(location, stack, currentState.FinallyStack, returnState);
var innerState = CreateNewStateValue(currentState.FinallyStack, handlerName);
var stateBeforeFinally = CreateNewStateValue(innerState.FinallyStack);
currentBlock.Add(new JsSetNextStateStatement(innerState.StateValue));
currentBlock.AddRange(Handle(ImmutableStack <StackEntry> .Empty.Push(new StackEntry(stmt.GuardedStatement, 0)), breakStack, continueStack, new State(currentState.LoopLabelName, currentState.StateValue, innerState.FinallyStack), stateBeforeFinally, false, false));
Enqueue(ImmutableStack <StackEntry> .Empty.Push(new StackEntry(JsStatement.Block(JsStatement.BlockMerged(new JsStatement[0])), 0)), breakStack, continueStack, stateBeforeFinally, stateAfter.Item1);
if (!stack.IsEmpty || location.Index < location.Block.Statements.Count - 1)
{
Enqueue(PushFollowing(stack, location), breakStack, continueStack, stateAfter.Item1, returnState);
}
return(false);
}
else if (_isIteratorBlock && stmt.Finally != null && !currentState.FinallyStack.IsEmpty)
{
// This is necessary to special-case in order to ensure that the inner finally block is executed before all outer ones.
return(HandleTryStatement(JsStatement.Try(JsStatement.Try(stmt.GuardedStatement, stmt.Catch, null), null, stmt.Finally), location, stack, breakStack, continueStack, currentState, returnState, currentBlock, isFirstStatement));
}
else
{
var rewriter = new NestedStatementFixer(breakStack, continueStack, currentState, _exitState.Value, _makeSetResult);
JsBlockStatement guarded;
var guardedConstructs = FindInterestingConstructsVisitor.Analyze(stmt.GuardedStatement);
if ((guardedConstructs & (InterestingConstruct.Label | InterestingConstruct.Await)) != InterestingConstruct.None)
{
if (!isFirstStatement)
{
var sv = CreateNewStateValue(currentState.FinallyStack);
Enqueue(stack.Push(location), breakStack, continueStack, sv, returnState);
currentBlock.Add(new JsGotoStateStatement(sv, currentState));
return(false);
}
var inner = ProcessInner(stmt.GuardedStatement, breakStack, continueStack, currentState.FinallyStack, currentState.StateValue);
guarded = JsStatement.Block(inner.Item1);
currentBlock.Add(new JsSetNextStateStatement(inner.Item2));
}
else
{
guarded = rewriter.Process(stmt.GuardedStatement);
}
JsCatchClause @catch;
if (stmt.Catch != null)
{
if (FindInterestingConstructsVisitor.Analyze(stmt.Catch.Body, InterestingConstruct.Label))
{
var inner = ProcessInner(stmt.Catch.Body, breakStack, continueStack, currentState.FinallyStack, null);
@catch = JsStatement.Catch(stmt.Catch.Identifier, JsStatement.Block(new[] { new JsSetNextStateStatement(inner.Item2) }.Concat(inner.Item1)));
}
else
{
var body = rewriter.Process(stmt.Catch.Body);
@catch = ReferenceEquals(body, stmt.Catch.Body) ? stmt.Catch : JsStatement.Catch(stmt.Catch.Identifier, body);
}
}
else
{
@catch = null;
}
JsBlockStatement @finally;
if (stmt.Finally != null)
{
if (FindInterestingConstructsVisitor.Analyze(stmt.Finally, InterestingConstruct.Label))
{
var inner = ProcessInner(stmt.Finally, breakStack, continueStack, currentState.FinallyStack, null);
@finally = JsStatement.Block(new[] { new JsSetNextStateStatement(inner.Item2) }.Concat(inner.Item1));
}
else
{
@finally = rewriter.Process(stmt.Finally);
}
if ((guardedConstructs & InterestingConstruct.Await) != InterestingConstruct.None)
{
// Wrap the finally block inside an 'if (doFinallyBlocks) {}'
@finally = JsStatement.Block(JsStatement.If(JsExpression.Identifier(_doFinallyBlocksVariableName), @finally, null));
}
}
else
{
@finally = null;
}
if (currentBlock.Count > 0 && _childStates.ContainsKey(currentState.StateValue))
{
var newBlock = JsStatement.If(JsExpression.Same(JsExpression.Identifier(_stateVariableName), JsExpression.Number(currentState.StateValue)), JsStatement.Block(currentBlock), null);
currentBlock.Clear();
currentBlock.Add(newBlock);
}
currentBlock.Add(JsStatement.Try(guarded, @catch, @finally));
return(true);
}
}
public virtual JsCatchClause VisitCatchClause(JsCatchClause clause, TData data)
{
var body = VisitStatement(clause.Body, data);
return(ReferenceEquals(body, clause.Body) ? clause : JsStatement.Catch(clause.Identifier, body));
}
