Re: [v8-users] __jit_debug_register_code was not invoked in debug build
No. it does not. Neither --gdbjit or --gdbjit_full works on d8. One thing I noticed is that in this version of d8, I am not seeing any RWX code pages. Obviously, V8 enforces W^X policy on JIT code pages. But I am not sure if this is the reason for that. Let me know. Thanks. best On Tue, Jun 19, 2018 at 2:45 AM, Ben Noordhuis wrote: > On Tue, Jun 19, 2018 at 4:11 AM, Mingwei Zhang wrote: >> Hi Ben, >> >> The problem is that I don't get any breakpoint hit notification in gdb. The >> program just execute and exited normally, regardless of whether i set the >> breakpoint or not in __jit_debug_register_code. >> >> I double checked in instructions that when I am using gm.py with target >> x64.debug, it does use the option ENABLE_GDB_JIT_INTERFACE. >> >> So, then I am very confused why I don't get breakpoint hit in gdb. >> >> Appreciate your help. > > Do things go better when you also pass --gdbjit_full to d8? If not, > I'd say it's safe to assume the code has bitrotted (but fix-up CLs > undoubtedly welcome in that case.) > > -- > -- > v8-users mailing list > v8-users@googlegroups.com > http://groups.google.com/group/v8-users > --- > You received this message because you are subscribed to the Google Groups > "v8-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- Mingwei Zhang -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [v8-users] __jit_debug_register_code was not invoked in debug build
On Tue, Jun 19, 2018 at 4:11 AM, Mingwei Zhang wrote: > Hi Ben, > > The problem is that I don't get any breakpoint hit notification in gdb. The > program just execute and exited normally, regardless of whether i set the > breakpoint or not in __jit_debug_register_code. > > I double checked in instructions that when I am using gm.py with target > x64.debug, it does use the option ENABLE_GDB_JIT_INTERFACE. > > So, then I am very confused why I don't get breakpoint hit in gdb. > > Appreciate your help. Do things go better when you also pass --gdbjit_full to d8? If not, I'd say it's safe to assume the code has bitrotted (but fix-up CLs undoubtedly welcome in that case.) -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [v8-users] __jit_debug_register_code was not invoked in debug build
Hi Ben,
The problem is that I don't get any breakpoint hit notification in gdb. The
program just execute and exited normally, regardless of whether i set the
breakpoint or not in __jit_debug_register_code.
I double checked in instructions that when I am using gm.py with target
x64.debug, it does use the option ENABLE_GDB_JIT_INTERFACE.
So, then I am very confused why I don't get breakpoint hit in gdb.
Appreciate your help.
On Monday, June 18, 2018 at 3:20:44 PM UTC-7, Ben Noordhuis wrote:
>
> On Sun, Jun 17, 2018 at 11:15 PM, Mingwei Zhang > wrote:
> > Dear V8 developer,
> >
> > I recently tried to use the debugging interface for gdb on JIT code.
> When I
> > tried building a debug build of V8 and following the instructions in:
> >
> > https://github.com/v8/v8/wiki/GDB-JIT-Interface
> >
> > I launched my program using the following command:
> >
> >> gdb --args ./d8 --gdbjit helloworld.js
> >
> >
> > In the gdb prompt, I setup a breakpoint in __jit_debug_register_code
> before
> > launch my program, but looks like the hook was never invoked.
> >
> > I am using gdb 7.11 in Ubuntu 16.04.
> > d8 version 6.7.0 (candidate)
> >
> > My helloworld.js is very simple like this:
> >>>
> >>> function func() {
> >>>
> >>> console.log('hello');
> >>>
> >>> }
> >>>
> >>>
> >>> func()
> >>
> >>
> >
> > Thanks.
>
> You don't have to set a breakpoint in __jit_debug_register_code, gdb
> does that for you. It's a magic method that gdb recognizes, see
> https://sourceware.org/gdb/onlinedocs/gdb/Declarations.html for
> details.
>
> That said, the gdbjit code is unmaintained - or at least not regularly
> tested - and quite possibly broken. YMMV.
>
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Re: [v8-users] __jit_debug_register_code was not invoked in debug build
On Sun, Jun 17, 2018 at 11:15 PM, Mingwei Zhang wrote:
> Dear V8 developer,
>
> I recently tried to use the debugging interface for gdb on JIT code. When I
> tried building a debug build of V8 and following the instructions in:
>
> https://github.com/v8/v8/wiki/GDB-JIT-Interface
>
> I launched my program using the following command:
>
>> gdb --args ./d8 --gdbjit helloworld.js
>
>
> In the gdb prompt, I setup a breakpoint in __jit_debug_register_code before
> launch my program, but looks like the hook was never invoked.
>
> I am using gdb 7.11 in Ubuntu 16.04.
> d8 version 6.7.0 (candidate)
>
> My helloworld.js is very simple like this:
>>>
>>> function func() {
>>>
>>> console.log('hello');
>>>
>>> }
>>>
>>>
>>> func()
>>
>>
>
> Thanks.
You don't have to set a breakpoint in __jit_debug_register_code, gdb
does that for you. It's a magic method that gdb recognizes, see
https://sourceware.org/gdb/onlinedocs/gdb/Declarations.html for
details.
That said, the gdbjit code is unmaintained - or at least not regularly
tested - and quite possibly broken. YMMV.
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