Original commit message:
[ptr-compr] Fix multi-cage mode
This CL introduces PtrComprCageAccessScope which sets/restores current
thread's pointer compression cage base values. It's supposed to be used
by V8 jobs accessing V8 heap outside of v8::Isolate::Scope or
i::LocalHeap or i::LocalIsolate scopes (they already ensure that the
cage base values are properly initialized).
For all other build modes PtrComprCageAccessScope is a no-op.
For simplicity reasons the multi-cage mode is made incompatible with
external code space.
Bug: v8:13788, v8:14292
Change-Id: I06c2d19a1eb7254fa7af07a17617e22d98abea9f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4846592
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#90075}
Refs: 475c8cdf9a
PR-URL: https://github.com/nodejs/node/pull/50680
Refs: https://bugs.chromium.org/p/v8/issues/detail?id=14292
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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