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From "Nikolay Kurtov" <nkur...@gmail.com>
Subject Re: [drlvm][jitrino]Difference in bc-mapping after translator
Date Wed, 12 Mar 2008 09:18:16 GMT
JIRA issue created
https://issues.apache.org/jira/browse/HARMONY-5595

2008/3/12, Mikhail Fursov <mike.fursov@gmail.com>:
>
> Looks like the reason is that LabelInst gets its offset in IRBuilder only
> after next HIR inst is added to the block.
> In this case we see that ILOAD_0 is not represented as HIR inst, so
> LabelInst gets its offset from the second inst.
> This is bug in translator.
>
> The most simple fix is to move LabelInst bc-offset update from
> Inst* IRBuilder::appendInst(Inst* inst) {
> to
> void IRBuilder::setBcOffset(uint32 bcOffset)
>
> Anyway I think this problem is worth creating a JIRA issue.
>
>
>
>
>
> On Wed, Mar 12, 2008 at 2:11 PM, Nikolay Kurtov <nkurtov@gmail.com> wrote:
>
> > Here is the method's code
> >
> >    public static byte func(byte val) {
> >        byte result = 1;
> >        switch (val) {
> >        case 0:
> >            for (int i = 0; i < 54321; i++) {
> >                result += i;
> >            }
> >            break;
> >        case 1:
> >            result = (byte) (val + 45);
> >            break;
> >        case 4:
> >            result = (byte) (val + 21);
> >            break;
> >        default:
> >            result--;
> >            break;
> >        }
> >        if (result < 30) {
> >            result <<= 1;
> >        } else {
> >            result /= 2;
> >        }
> >        return result;
> >    }
> >
> > 2008/3/12, Mikhail Fursov <mike.fursov@gmail.com>:
> > >
> > > Nikolay, could you post a Java method here to reproduce the issue?
> > >
> > >
> > > On Wed, Mar 12, 2008 at 1:29 AM, Nikolay Kurtov <nkurtov@gmail.com>
> > wrote:
> > >
> > > > I compiled the same class with JET and OPT, and found a difference
> in
> > > > bytecode-mapping
> > > >
> > > > One of branches of switch goes to this code:
> > > > ;;  58) ILOAD_0
> > > > ;;  59) BIPUSH          45
> > > > ;;  61) IADD
> > > > ;;  62) I2B
> > > > ;;  63) ISTORE_1
> > > > ....
> > > > So, after the recompilation by OPT, the block should begin from
> > bcOffset
> > > > 58
> > > >
> > > > In OPT after translator I found in irdump the following block
> > > > Block L5:
> > > >  Predecessors: ENTRY_L0
> > > >  Successors: L8
> > > >  I5:L5: bcmap:59
> > > >  I34:ldci4     #45 -) t14:int32
> > > >  I35:add   t1, t14 -) t15:int32
> > > >  I36:convi1  t15 -) t16:int32
> > > >  I37:stvar     t16 -) v1:int32
> > > > ....
> > > >
> > > > The block begins from bcOffset 59
> > > > I consider these values in JET and OPT should be equal.
> > > > Is it a bug?
> > > >
> > > > Now I'm exploring the code of JavaByteCodeTranslator and IRBuilder
> but
> > > > cannot figure out the cause of problem
> > > > Can you advise me how to fix it?
> > > >
> > > > --
> > > > Regards,
> > > > Nikolay
> > > >
> > > > mailto: nkurtov@gmail.com
> > > >
> > >
> > >
> > >
> > >
> > > --
> > >
> > > Mikhail Fursov
> > >
> >
> >
> >
> > --
> > Regards,
> > Nikolay
> >
> > mailto: nkurtov@gmail.com
> >
>
>
>
>
> --
>
> Mikhail Fursov
>



-- 
Regards,
Nikolay

mailto: nkurtov@gmail.com

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