Alexander Aprelev
fce355b8b0
Attempts to run class finalizaton on background thread revealed the problem where during optimization(which could run on mutator thread too) we might need to finalize previously unseen class, load annotatons for it, load and set some constant fields. This could result in updating Fields guarded_cid, requires check during installation of newly produced optimized code. Because mutator thread is currently exempt from cloning and validating fields guards, that could result in invalid optimized code installation. This CL ensures that fields are always cloned in optimizing compiler even when it runs on mutator thread. Ability to run multiple optimizing compilers is also needed for dartbug.com/36097. Issue https://github.com/dart-lang/sdk/issues/36097 TEST=existing test suite with ltw isolate groups enabled, https://dart-review.googlesource.com/c/sdk/+/176300 mocked up test(still to be improved). Change-Id: I608f4abff30b468cb9d0ab270221a0ba72c32470 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175341 Commit-Queue: Alexander Aprelev <aam@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>