tree 383ba28ba93a0ba85469ed8d74198a38578fc79f
parent 8161b299c9537fab8fe69a0e5c3d3c8d41f7d66a
author Alexander Markov <alexmarkov@google.com> 1618619966 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1618619966 +0000

[vm] Fix materialization of instances with uninitialized late fields

When materializing objects during deoptimization, their fields were
set using Instance::SetField. However, Instance::SetField updates
field guards and it is strict about not taking 'sentinel' value.
That caused assertion to fail when trying to materialize an instances
with late fields which were not initialized yet and have 'sentinel'
value.

Changed materialization to use a more low-level SetFieldAtOffset
in case of sentinel value.

TEST=runtime/tests/vm/dart/regress_45691_test.dart
Fixes https://github.com/dart-lang/sdk/issues/45691

Change-Id: If39a1e4f2fc0d0fe7f988a80c7a0073cafff28b0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195490
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>