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4 Commits

Author SHA1 Message Date
Lachlan Sneff
e362b56b07 Turns out we can just throw an exception from the signal handler 
without any fancy tricks.

This has been tested on macos, hopefully it works on linux too.
 2019-03-03 02:15:53 -08:00
Lachlan Sneff
9cfda6800f Try to return an error from call_protected when an exception occurs. 
Something breaks pretty drastically sometimes, not sure why.
 2019-03-02 19:08:15 -08:00
Lachlan Sneff
caf2205936 Add a signal handler for macos and linux. 
Implementation Notes:
- To avoid setjmp, longjmp, and the mess that those create, we instead set the interrupting
    context of the signal handler to return into the `throw_trap` routine. To my surprise,
    this actually works. The stack ends up getting unwound normally and the memory-oob error
    is caught by the trampoline.
 2019-03-02 17:00:05 -08:00
Lachlan Sneff
5760f6006a Start implementing exception handling by adding frame descriptor entry processing. 
- Soon, we should be able basic exceptions.
 2019-03-02 10:56:02 -08:00