From: SASADA Koichi <ko1@...>
Date: 2008-10-23T00:01:39+09:00
Subject: [ruby-core:19447] Re: confused by this catch table

Paul Brannan wrote:
> Given a start of 9 and an end of 10, the retry catch table entry seems
> to cover only the instruction at address 9 (the nop).  So if a retry is
> issued, how is it to have any effect?

See vm.c:1199

> 	    /* enter catch scope */
> 	    GetISeqPtr(catch_iseqval, catch_iseq);
> 	    cfp->sp = cfp->bp + cont_sp;
> 	    cfp->pc = cfp->iseq->iseq_encoded + cont_pc;

Before VM enter into rescue clause, VM set PC to continued.

> (that is, since there is no code within the retry catch entry's
> applicable instructions that can throw a retry tag, does this
> effectively become a no-op?)

Did do try such a ruby code?

-- 
// SASADA Koichi at atdot dot net