public ExceptionHandlingManager()
{
ExceptionTable = new ExceptionRegistrationTable();
int invalidIndex = ProtoCore.DSASM.Constants.kInvalidIndex;
// System default exception registration
SystemRegistration = ExceptionTable.Register(invalidIndex, invalidIndex, invalidIndex);
SystemRegistration.ParentIndex = ProtoCore.DSASM.Constants.kInvalidIndex;
// Exception registration for the top most associative code block.
//
// Why we need to manually add this one even when code gen is compiling
// the top-most language node the exception registration for that
// language code block will be added?
//
// The reason is ParentIndex, which will be updated dynamcailly at
// run-time, i.e., it should point to the index of exception registration
// for the upper scope. Normally, we will set this value either at
// OpCode.Bounce or at OpCode.CallR. But for the top-most language
// block, it doesnt start from there, so here we manully set its
// ParentIndex to the default system exception registration instance.
//
// If we can consolidate the updating code at OpCode.Bounce and at
// OpCode.CallR, then it is not necessary to manually add this one.
// (The reason that we have to do that is because we need the value
// of pc in the upper scope, i.e., where does the execution jump to
// other function call or language block; otherwise Execute() is a
// ideal place to put that updating code). Should refactor this piece
// of code for that case. -- Yu Ke
TopMostAssocBlockRegistration = ExceptionTable.Register(0, invalidIndex, invalidIndex);
TopMostAssocBlockRegistration.ParentIndex = SystemRegistration.RegistrationTableIndex;
CurrentActiveRegistration = TopMostAssocBlockRegistration;
IsStackUnwinding = false;
TargetHandler = null;
Context = null;
Observers = new List <IFirstHandExceptionObserver>();
}
public ExceptionHandlingManager()
{
ExceptionTable = new ExceptionRegistrationTable();
int invalidIndex = ProtoCore.DSASM.Constants.kInvalidIndex;
// System default exception registration
SystemRegistration = ExceptionTable.Register(invalidIndex, invalidIndex, invalidIndex);
SystemRegistration.ParentIndex = ProtoCore.DSASM.Constants.kInvalidIndex;
// Exception registration for the top most associative code block.
//
// Why we need to manually add this one even when code gen is compiling
// the top-most language node the exception registration for that
// language code block will be added?
//
// The reason is ParentIndex, which will be updated dynamcailly at
// run-time, i.e., it should point to the index of exception registration
// for the upper scope. Normally, we will set this value either at
// OpCode.Bounce or at OpCode.CallR. But for the top-most language
// block, it doesnt start from there, so here we manully set its
// ParentIndex to the default system exception registration instance.
//
// If we can consolidate the updating code at OpCode.Bounce and at
// OpCode.CallR, then it is not necessary to manually add this one.
// (The reason that we have to do that is because we need the value
// of pc in the upper scope, i.e., where does the execution jump to
// other function call or language block; otherwise Execute() is a
// ideal place to put that updating code). Should refactor this piece
// of code for that case. -- Yu Ke
TopMostAssocBlockRegistration = ExceptionTable.Register(0, invalidIndex, invalidIndex);
TopMostAssocBlockRegistration.ParentIndex = SystemRegistration.RegistrationTableIndex;
CurrentActiveRegistration = TopMostAssocBlockRegistration;
IsStackUnwinding = false;
TargetHandler = null;
Context = null;
Observers = new List<IFirstHandExceptionObserver>();
}