Hi Jay
To pass code through Ignition, the command-line also needs to specify a
filter to identify which function should be passed to ignition, e.g.
d8 --ignition --ignition-filter=foo --print-bytecode foo.js
The code also needs to call the function named in the filter. To run all
code through Ignition, specify the --ignition-filter=*.
The --print-bytecode flag works best with a debug build as it'll show the
bytecode and constant array rather than just top-level metadata.
There is a path to generate optimized code using TurboFan taking bytecode
from Ignition as input:
src/compiler/bytecode-graph-builder.{h,cc}
For now, the command-line needs to include the Ignition arguments with
--always-opt which will force optimized compilation from bytecode. Support
for profiling interpreted code is coming and will selectively optimize hot
code.
There are no paths between ignition and full-code/crankshaft and no plans
in this direction.
Ignition is a work in progress and should fail hard when the limits of the
implementation are hit. All effort to date has been on features, there's a
long way to go on performance. It works on all v8 platforms except x87.
Thanks
Orion
On Tue, Dec 29, 2015 at 5:51 PM, Jay <[email protected]> wrote:
> Hi,
>
> I want to try Ignition interpreter and am having trouble enabling it.
> I thought the following set of flags should print some logs, but it gives
> me nothing.
>
> --ignition --print_bytecode
>
> I tried running on a debugger and setting a breakpoint at
> *Interpreter::MakeBytecode()*, but it never reaches the function.
> How can I properly enable Ignition interpreter? Does it not support x64?
> And I was also wondering if there is any circumstance in which you want to
> disable optimizing compilers (Crankshaft and Turbofan) and use the
> lower-tier only (Ignition or Full Compiler).
>
> Thanks,
> Jay
>
> --
> --
> v8-dev mailing list
> [email protected]
> http://groups.google.com/group/v8-dev
> ---
> You received this message because you are subscribed to the Google Groups
> "v8-dev" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected].
> For more options, visit https://groups.google.com/d/optout.
>
--
--
v8-dev mailing list
[email protected]
http://groups.google.com/group/v8-dev
---
You received this message because you are subscribed to the Google Groups
"v8-dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
