deps: backport a8f6869 from upstream V8
Original commit message: [debug] Fully implement Debug::ArchiveDebug and Debug::RestoreDebug. I have a project that embeds V8 and uses a single `Isolate` from multiple threads. The program runs just fine, but sometimes the inspector doesn't stop on the correct line after stepping over a statement that switches threads behind the scenes, even though the original thread is restored by the time the next statement is executed. After some digging, I discovered that the `Debug::ArchiveDebug` and `Debug::RestoreDebug` methods, which should be responsible for saving/restoring this `ThreadLocal` information when switching threads, currently don't do anything. This commit implements those methods using MemCopy, in the style of other Archive/Restore methods in the V8 codebase. Related: https://groups.google.com/forum/#!topic/v8-users/_Qf2rwljRk8 R=yangguo@chromium.org,jgruber@chromium.org CC=info@bnoordhuis.nl Bug: v8:7230 Change-Id: Id517c873eb81cd53f7216c7efd441b956cf7f943 Reviewed-on: https://chromium-review.googlesource.com/833260 Commit-Queue: Yang Guo <yangguo@chromium.org> Reviewed-by:Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#54902} Refs: https://github.com/v8/v8/commit/a8f6869177685cfb9c199c454a86f4698c260515 Fix build errors by matching older V8 APIs used by Node. It looks like SetDebugDelegate(debug::DebugDelegate* delegate, bool pass_ownership) was simplified to just SetDebugDelegate(debug::DebugDelegate* delegate) in https://github.com/v8/v8/commit/37dcd837dbafa7f1175be5f01f0def013437c7e7, but the extra `pass_ownership` parameter is still there in the current version of `node/deps/v8`. I should be able to fix those tests by passing `false` for `pass_ownership`. Also, the `DebugDelegate::BreakProgramRequested` method lost a parameter in https://github.com/v8/v8/commit/e404670696b4c49d7f8adcdb075b98acab9967dd, but it's not a parameter I was using in my test, so there shouldn't be any harm in adding the `exec_state` parameter back to `BreakProgramRequested` (and continuing to ignore it). Skip restoring debug state unless thread previously in DebugScope. A simpler version of the changes I proposed upstream in this V8 change request: https://chromium-review.googlesource.com/c/v8/v8/+/1168449 In this version, Debug::RestoreDebug never attempts to enter a new DebugScope, but merely reuses the previous one, if we're returning to a thread that was previously in a DebugScope. If the thread was not previously in a DebugScope, I believe it does not need to have any debugging state restored with ClearOneShot and PrepareStep. The tests from https://chromium-review.googlesource.com/c/v8/v8/+/833260 still pass, and the failing V8-CI tests are now passing locally for me. PR-URL: https://github.com/nodejs/node/pull/22122 Reviewed-By:
Franziska Hinkelmann <franziska.hinkelmann@gmail.com> Reviewed-By:
Michaël Zasso <targos@protonmail.com>
parent
4c34302b
Please register or sign in to comment