Hi Andreas,

You can ignore the error with the --turbo-filter=* flag. The flag turns on 
the experimental Turbofan compiler, which does not fully support 
deoptimization yet.

On Saturday, August 30, 2014 1:51:27 PM UTC+2, Andreas Madsen wrote:
>
> I'm trying to suggest a change for v8 there will extend the frame objects
> there can be obtained using Error.prepareStackTrace, so they also have
> a getFunctionArguments and a getFunctionVariabels method. As this is
> quite useful for understanding the cause of runtime errors.
>
> See attachment for .patch file.
>
> However there is an issue in the added test. The error is caused by the
> optimization of the test function. I have tried to solve it using the
> FrameInspector but without luck. I hope someone kind can help me solve
> the issue.
> The error output can be seen below.
>
> ========================================================
> ./d8 --allow-natives-syntax test/mjsunit/mjsunit.js 
> test/mjsunit/local-variabels.js
>
> ["param_def","param_undef","inner","locals"]
> ["outer","deep"]
> ["param_def","param_undef","inner","locals"]
> ["outer","deep"]
> ["param_def","param_undef","inner","locals"]
> ["outer","deep"]
> test/mjsunit/mjsunit.js:178: Failure: expected <"outer-scope"> found 
> <undefined>
>     throw new MjsUnitAssertionError(message);
>           ^
> Error
>     at new MjsUnitAssertionError (test/mjsunit/mjsunit.js:31:16)
>     at fail (test/mjsunit/mjsunit.js:178:11)
>     at assertEquals (test/mjsunit/mjsunit.js:259:7)
>     at deep (test/mjsunit/local-variabels.js:51:39)
>     at test (test/mjsunit/local-variabels.js:54:3)
>     at test/mjsunit/local-variabels.js:60:1
> ========================================================
>
> ========================================================
> ./d8 --turbo-filter="*" --allow-natives-syntax test/mjsunit/mjsunit.js 
> test/mjsunit/local-variabels.js
> ["param_def","param_undef","inner","locals"]
> ["outer","deep"]
> ["param_def","param_undef","inner","locals"]
> ["outer","deep"]
> ["param_def","param_undef","inner","locals"]
>
> \#
> \# Fatal error in ../src/deoptimizer.cc, line 151
> \# CHECK_NE(deoptimization_index, Safepoint::kNoDeoptimizationIndex) failed
> \#   Value: 268435455
> \#
>
> ==== C stack trace ===============================
>
>  1: ??
>  2: ??
>  3: ??
>  4: ??
> ========================================================
>

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