| commit | a44d1eefe67fbe28e9c43e4dd7d8b679bc730ccf | [log] [tgz] |
|---|---|---|
| author | Martin Kustermann <kustermann@google.com> | Tue Jun 01 12:59:23 2021 +0000 |
| committer | commit-bot@chromium.org <commit-bot@chromium.org> | Tue Jun 01 12:59:23 2021 +0000 |
| tree | 950b1976fbd9778794bd2c665c5c33ec3be66e25 | |
| parent | 7fb2e50d741c8d319ad7d5aab07128d8fb77dde7 [diff] |
[vm/compiler] Allow lazy deopts to continue in unoptimized code at beginning of IR instruction
If an IR instruction lazy-deopts it usually continues in unoptimized
code in the same IR instruction after-call.
Though in certain situations we want to continue before-call in
unoptimized code.
Two cases relevant in this CL:
* An instruction gets LICMed: If it lazy-deopts it will continue
at the Goto instruction outside the loop.
* A recognized method which got it's InstanceCall replaced by several
IR instructions. If any of them (except the last one) lazy-deopts
it should re-try the call in unoptimized code (e.g. []=)
In order to faciliate this we add a bit to the [Environment] which
encodes whether the continuation point in unoptimized code is
before-call - if so, we issue corresponding metadata.
Issue https://github.com/dart-lang/sdk/issues/45213
Issue https://github.com/dart-lang/sdk/issues/46070
TEST=runtime/tests/vm/dart{,_2}/regress_46070_test.dart
Change-Id: Ib824081768a2fd6293751a8fe09753e0d8155c87
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/200644
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Slava Egorov <vegorov@google.com>
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