public override void Visit(TryStatement node)
{
VisitNode(node.Statement);
VisitNode(node.Catch);
VisitNode(node.Finally);
Visit((Statement)node);
}
public override void Visit(TryStatement node)
{
///we may have an exception anywhere in the try block
///so stack may be at its max when entering the catch block
///one option is to clear up the stack before starting (we chose this one)
///the other optios is to make sure there is enough room on the stack
PushLocation(node);
_ilGen.BeginExceptionBlock();
_labelInfos.PushProtectedRegion(node);
VisitNode(node.Statement);
_labelInfos.PopProtectedRegion(node);
VisitNode(node.Catch);
VisitNode(node.Finally);
_ilGen.EndExceptionBlock();
PopLocation();
}
public override void Visit(TryStatement node) { Visit((Statement)node); }
public override void Visit(TryStatement node)
{
///In case we ever use a StackPointer variable that is changed at runtime, we have to consider the following:
///we may have an exception anywhere in the try block
///so stack may be at its max when entering the catch block
///one option is to clear up the stack before starting (we chose this one)
///the other optios is to make sure there is enough room on the stack
PushLocation(node);
var tryICIndex = ReserveNewICIndex();
var tryBeginIndex = GetCurrentICIndex() + 1;
VisitNode(node.Statement);
var tryEndIndex = GetCurrentICIndex();
var exceptionVariableIndex = -1;
var catchBeginIndex = int.MaxValue;
var catchEndIndex = int.MinValue;
if (node.Catch != null)
{
var symbol = node.Catch.Identifier.Symbol;
Debug.Assert(symbol != null, new JSSourceLocation(_currFuncMetadata, node.Catch), string.Format("Cannot find symbol for identifier {0} in catch clause", node.Catch.Identifier));
var originalSymbolType = symbol.SymbolType;
symbol.SymbolType = JSSymbol.SymbolTypes.Local; //This symbols is defined only in the catch scope.
exceptionVariableIndex = GetIndex(symbol);
catchBeginIndex = GetCurrentICIndex() + 1;
VisitNode(node.Catch);
catchEndIndex = GetCurrentICIndex();
symbol.SymbolType = originalSymbolType;
}
var finallyBeginIndex = int.MaxValue;
var finallyEndIndex = int.MinValue;
if (node.Finally != null)
{
finallyBeginIndex = GetCurrentICIndex() + 1;
VisitNode(node.Finally);
finallyEndIndex = GetCurrentICIndex();
}
BeginICMethod(node);
_ilGen.Ldarg_CallFrame();
_ilGen.Ldc_I4(tryBeginIndex);
_ilGen.Ldc_I4(tryEndIndex);
_ilGen.Ldc_I4(catchBeginIndex);
_ilGen.Ldc_I4(catchEndIndex);
_ilGen.Ldc_I4(finallyBeginIndex);
_ilGen.Ldc_I4(finallyEndIndex);
_ilGen.Ldc_I4(exceptionVariableIndex);
_ilGen.Call(Types.Operations.ICMethods.TryCatchFinally);
EndICMethod(tryICIndex, GetCurrentICIndex() + 1);
PopLocation();
}
public override void Visit(TryStatement node)
{
Visit((Statement)node);
}
public abstract void Visit(TryStatement node);
public override void Visit(TryStatement node)
{
throw new NotImplementedException();
}