tree 28a15c0c5179bf113250cf694f7e18acd67ec61c
parent 11d6203130004d0e3efff70f7873933fb53945b9
author Tess Strickland <sstrickl@google.com> 1615797460 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1615797460 +0000

[vm/compiler] Write retained reasons JSON to a file.

Instead of being part of the --trace-precompiler output, there is
is a new flag --write-retained-reasons-to=<path>.

To allow for non-functions to have reasons for retention, the
JSON objects in the array now have one additional field:

* type: a string, the C++ type of the Dart object.

This CL also wraps all the machinery in a RetainedReasonsWriter
class instead of putting it in the Precompiler interface.

TEST=vm/dart{,2}/use_trace_precompiler_flag

Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-nnbd-linux-release-x64-try
Change-Id: Ifa40ac64fdcbdad5114499425c7f8b08e327fa76
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/190525
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>