tree 22fa69290df0abc2d95d2242dd79b71ec6853396
parent 234128e8d37d78f4c03405734eba3b05a6691ce5
author Aske Simon Christensen <askesc@google.com> 1660667347 +0000
committer Commit Bot <commit-bot@chromium.org> 1660667347 +0000

[dart2wasm] Fix nullable downcast from types above dataref

When casting down from `anyref` or `eqref`, an intermediate
`ref.as_data` instruction is needed. However, this instruction traps on
`null`, so for nullable casts, explicit null handling is required.

Change-Id: I835f1b59d291f848a008c855843f286f0d11d5fb
Cq-Include-Trybots: luci.dart.try:dart2wasm-linux-x64-d8-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/255242
Reviewed-by: Joshua Litt <joshualitt@google.com>
Auto-Submit: Aske Simon Christensen <askesc@google.com>
Commit-Queue: Joshua Litt <joshualitt@google.com>