Bug 190336 – [JSC][YARR] Support YarrJIT in sampling profiler

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: JavaScriptCore

[Yusuke Suzuki]

...

[Yusuke Suzuki]

When running uglify-js / coffeescript in web-tooling-benchmark, so much time is consumed in '#<nil>:None:<nil>'.


Sampling rate: 1000.000000 microseconds
Hottest bytecodes as <numSamples   'functionName#hash:JITType:bytecodeIndex'>
  2441    'Function#<nil>:None:<nil>'
   642    '#<nil>:None:<nil>'
   462    'stringify#<nil>:None:<nil>'
   188    'defaults#EZuPgj:FTL:755'
   174    'push#EmOCkn:FTL:58'
   155    'quote#A7WHiP:Baseline:62 <-- compareTo#EmCQ7y:FTL:174'
   112    'compareTo#EmCQ7y:FTL:192'
    98    'is_unicode_combining_mark#CdiBr0:Baseline:43 <-- is_identifier_char#BBa5RX:FTL:123'
    95    '#Am9gS7:Baseline:10 <-- doit#At6wj3:FTL:76'
    84    'OutputStream#D03V2N:FTL:1420'
    71    'push#EmOCkn:FTL:114'
    70    'push#EmOCkn:FTL:180'
    69    'pop#CxNXKP:Baseline:85 <-- #D43Ncu:FTL:218'
    64    '_visit#AK9Sj2:FTL:100'
    61    'indexOf#<nil>:None:<nil>'

This is actually YarrJIT RegExp execution. We would like to have more detailed results for this time, like, "What RegExp takes much time?".

[Saam Barati]

That would be nice.

I thought the sampling profiler knows when it's in the YARR?

[Yusuke Suzuki]

*** This bug has been marked as a duplicate of bug 201702 ***