Anand Palaniswamy wrote:
> sunwjit, symcjit and even hotspot do "implicit exceptions." Meaning a
> null pointer exception is detected from a SIGSEGV, and the VM raises
> the related NullPointerExcetion from the signal handler.
TYA detects NullPointerExceptions with SIGSEGV on Linux.
Even shuJIT detects NPEs and ArithmeticExceptions
with SIGSEGV and SIGFPE.
> That said, the sunwjit port of Linux does NOT do implicit exceptions.
> There is a lot of code in the JIT that generates machine code that
> explicitly tests for NPEs, StackOverflows, ArithmeticExceptions.
I'm interested in why you know it.
Have you done the porting of the sunwjit?
> Personally I prefer explicit checks.
Why?
> But an ex-Self person (and now
> HotSpot person) once told me that explicit checks in the Self system
> cost about 5-10% in performance depending on the application you are
> running.
>
> -Anand.
Kazuyuki SHUDO Happy Hacking!
Muraoka Lab., Grad. School of Sci. & Eng., Waseda Univ.
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