This commit introduces a new mode for bytecode_dispatches_report.py
which reports the top sources of dispatches to a given bytecode and
the top destinations of dispatches from the same bytecode.
The bytecode name is passed with --top-dispatches-for-bytecode
(short form: -f), while the number of sources and destinations to
show is controlled with -n.
BUG=v8:4899
LOG=N
Review-Url: https://codereview.chromium.org/1979233002
Cr-Commit-Position: refs/heads/master@{#36284}
In addition to top source-destination pairs,
bytecode_dispatches_report.py now prints the hottest bytecode handlers
by the number of times they are executed and dispatch to another one,
regardless of the dispatch target.
Be aware that this figure does not match the number of times a handler
is executed for those which may not or will never dispatch, e.g.
Return or Throw.
BUG=v8:4899
LOG=N
Review URL: https://codereview.chromium.org/1875263004
Cr-Commit-Position: refs/heads/master@{#35629}
A new script, bytecode_dispatches_report.py reads the table produced
when FLAG_trace_ignition_dispatches is enabled and produces either a
report of top source-destination pairs, or a heatmap that can be
viewed interactively and saved to file.
BUG=v8:4899
LOG=N
Review URL: https://codereview.chromium.org/1869423002
Cr-Commit-Position: refs/heads/master@{#35438}
