The attached patch implements C exceptions in the kernel, which *don't*
depend on special support from the compiler. This is a 'request for
comments'. The patch is very initial, should not be applied.
I actually got this code to work in the kernel:
try {
printk("TEST: before throwing \n");
throw(1000);
printk("TEST: won't run\n");
}
catch(unsigned long, value) {
printk("TEST: caught: %ld\n", value);
} yrt;
I know it would a *hugh* task to get all existing code in the kernel
to use exceptions, but the design allows exceptions to be used locally
within the local call branches in *new* code. Basically, exception
handling needs to be added only to functions who call functions which
already use exceptions.
Although this patch is against 2.4, it should go to 2.5 (2.5.5-dj1
currently breaks here, so I am temporarily developing it using 2.4)
This patch implements only for i386 at the moment. Theoretically can be
ported to other archs. Of course, the arch dependant functions in this
code are separated for the ease of porting.
I haven't written it with interrupts and SMP in mind. I wonder what
are the race conditions and what should be protected there.
For unhandled exceptions, there's a possibility to add a function that
printk's the information about the unhandled exception (file, line
number, etc), and optionally calls panic() or BUG().
The code supports re-throwing from catches.
Last thing: I must get rid of that yrt closer macro. Suggestions?
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This archive was generated by hypermail 2b29 : Sat Feb 23 2002 - 21:00:45 EST