595012 - Exception handling tracker

Status: RESOLVED WONTFIX

(Tamarin Graveyard :: Virtual Machine, defect)

Description

[Edwin Smith]

Several general aspects could be improved with exception handling:

* temporary data used between throw and catch should be thread-local
* try should be free if no exceptions are thrown
* setjmp/longjmp have platform-specific hazards

Dependent bugs track details.

Comment 1

[Edwin Smith]

In discussions with Bernd about deoptimization, it might be better to get rid of callee-saved registers; that is, in jit code, treat any call as killing all registers.  This means all values for a particular method's activation frame will be found in that method's stack frame, and not some callee's stack frame.

This of course helps streamline try blocks.  Instead of using setjmp to save all the registers, they would be saved anyway prior to any call which subsequently threw an exception.