When deleting a JSObject's last property, only that particular slot
in the old-to-new rememebered set needs to be deleted. The object's
slots don't need to be invalidated anymore since V8 doesn't use
unboxed doubles anymore. While the runtime could install another
property at this address, it will therefore always be a tagged pointer.

Bug: v8:12578, chromium:1316289
Change-Id: Ief072f58e53501c1c1f01c902e21467a37ccdc3c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3620274
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80303}

This reverts commit 1267e518.

Reason for revert: Turned out to not support them: https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket/8815278972589078465/+/u/Bisect_1267e518/Retry/web-snapshot-4

Original change's description:
> [web snap] Support Symbols
>
> Bug: v8:11525,v8:12820
> Change-Id: Ie8b1bbe209d8bb6f759623ea01223a05d11090aa
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616514
> Commit-Queue: Marja Hölttä <marja@chromium.org>
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#80299}

Bug: v8:11525,v8:12820
Change-Id: Ia0107dfec12e72dc976348985e5c35dac28c170a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3620278
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Owners-Override: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#80302}

This is a reland of commit a3f66927

The reland addresses a few CHECKs that were too agressive and also
properly adjusts Oilpan's marking configurations depending on V8's
flags.

Original change's description:
> [heap] Refactor atomic marking phase
>
> The atomic marking phase was organized in many distinct smaller
> phases. In particular, before http://crrev.com/c/3584115 the marking
> phase split into two large separate phases.
>
> This CL reorganizes marking into two phases that perform regular V8
> heap marking, Oilpan, and ephemerons:
> - A parallel phase that likely drains all marking worklists;
> - A single-threaded final phase to catch any left overs;
>
> This avoids artificial splitting in phases and also avoids repeated
> starting and joining of jobs.
>
> Change-Id: I5cccfc5777837d9ece10d8f4925781bf2d07d9da
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3602507
> Reviewed-by: Omer Katz <omerkatz@chromium.org>
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#80265}

Change-Id: I26648da361b92d787c173aa9d390100ce8958728
Bug: chromium:1320896
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616519
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80301}

Integrity levels are not handled yet (but there's a TODO now).

Bug: v8:11525, v8:12820
Change-Id: Id72e49b363615e51ec89a353101cc4cf76ccbab4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616515Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80300}

Bug: v8:11525,v8:12820
Change-Id: Ie8b1bbe209d8bb6f759623ea01223a05d11090aa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616514
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80299}

... not exceeding the maximum size of the backing store
before ReplacementStringBuilder in StringReplaceGlobalRegExpWithString.

Bug: v8:12843
Change-Id: I3ccf07a4e6de35a3a571ebfccc34e54eb27a0819
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616555Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#80298}

Bug: v8:7700
Change-Id: I389574d93725fe68816eddbebeef7fbfd3e136fb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616724
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80297}

1. Use `StringBuffer` instead of `StringView` in `WebDriverValue`.
2. Add some `DCHECK`s.
3. Reserve vector size.
4. Respect properties with `undefined` values.
5. Minor clean-ups.

Change-Id: Ic109acb1e3adf2d950767173c17a9203e3c816dc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3596173Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Auto-Submit: Maksim Sadym <sadym@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80296}

... moved into unittests.

- test-compiler was moved under https://chromium-review.googlesource.com/c/v8/v8/+/3596442. And move
test-compiler/DeepEagerCompilationPeakMemory to
unittests.status. Remove test-compiler/DecideToPretenureDuringCompilation
because it has been removed in https://chromium-review.googlesource.com/c/v8/v8/+/2839550.
- test-code-pages was moved under https://chromium-review.googlesource.com/c/v8/v8/+/3599404.
- test-api/TEST(TryCatch...) was moved under https://chromium-review.googlesource.com/c/v8/v8/+/3586770. And added
''APIExceptionTest.*': [SKIP],' in unittests.status
according to here https://source.chromium.org/chromium/chromium/src/+/master:v8/test/cctest/cctest.status;l=549.


Bug: v8:12781
Change-Id: Ie5067c1312c9d69f75d3efb831e15bea2eb38fa1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3612665Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#80295}

Bug: v8:11525
Change-Id: Ifec7ff76b5407d61f339d298a6f2eabbe77b7731
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3613398Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80294}

Bug: v8:11111
Change-Id: I9bd8db01232d147e309711837e69177a84600787
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616501
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80293}

We weren't really translating between location (line and column number)
and source position (character offset) consistently, especially when it
came to inline <script>s. There were also inconsistencies between what
Debugger.getPossibleBreakpoints and Debugger.setBreakpointByUrl would
do.

With this CL, we are now consistently operating under the following
assumptions:

(1) For inline <scripts>s with a //@ sourceURL annotation, we assume
    that the line and column number that comes in via the protocol is
    in terms of the source text of the script.
(2) For inline <script>s without said annotation, we assume that the
    line and column numbers are in terms of the surrounding document.

This is finally aligned with how the DevTools front-end operates.

Fixed: chromium:1319828
Change-Id: I98c4ef04b34a97caf060ff4f32690b135edb6ee6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3610622Reviewed-by: Kim-Anh Tran <kimanh@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Kim-Anh Tran <kimanh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80292}

This reverts commit 23b2d571.

Reason for revert: Breaks the V8 roll https://ci.chromium.org/ui/p/chromium/builders/try/linux-rel/1000394/

Original change's description:
> Reland "[heap] Store size with invalidated object"
>
> This is a reland of commit 5d235def
>
> The previous version of this CL got reverted because the cached
> size of an invalidated object wasn't up-to-date when performing a GC.
>
> Not all size changes go through NotifyObjectLayoutChange, so
> https://crrev.com/c/3607992 introduced NotifyObjectSizeChange as a
> bottleneck for object size changes/right-trimming. This method is
> now used to update the size of invalidated objects.
>
> Original change's description:
> > [heap] Store size with invalidated object
> >
> > When updating pointers during a full GC, a page might not be swept
> > already. In such cases there might be invalid objects and slots recorded
> > in free memory. Updating tagged slots in free memory is fine even though
> > it is superfluous work.
> >
> > However, the GC also needs to calculate the size of potentially dead
> > invalid objects in order to be able to check whether a slot is within
> > that object. But since that object is dead, its map might be dead as
> > well which makes size calculation impossible on such objects. The CL
> > changes this to cache the size of invalid objects. A follow-up CL will
> > also check the marking bit of invalid objects.
> >
> > Bug: v8:12578, chromium:1316289
> > Change-Id: Ie773d0862a565982957e0dc409630d76552d1a32
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3599482
> > Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> > Reviewed-by: Jakob Linke <jgruber@chromium.org>
> > Reviewed-by: Patrick Thier <pthier@chromium.org>
> > Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#80169}
>
> Bug: v8:12578, chromium:1316289
> Change-Id: I1f7c6070b8e7d116aeb1a8d03d4f87927ab40872
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3608632
> Reviewed-by: Jakob Linke <jgruber@chromium.org>
> Reviewed-by: Patrick Thier <pthier@chromium.org>
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#80262}

Bug: v8:12578, chromium:1316289
Change-Id: I88b73ebe09bb923ba4ac57b0dbdceb08a1badd99
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616730
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Igor Sheludko <ishell@chromium.org>
Owners-Override: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80291}

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/dc901ff..8d86026

Enable -Wconversion (#1390) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/8d86026

Add benchmark labels to the output of the comparison tool (#1388) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/b0d5adf

Filter out benchmarks that start with "DISABLED_" (#1387) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/a162a38

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,mlippautz@chromium.org

Change-Id: Ie49d074a433a737113c2bfe53d677fc112756df6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3615246
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
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Rolling v8/third_party/icu: https://chromium.googlesource.com/chromium/deps/icu/+log/5fb93cb..85814e1

CP PR 2070 fix int32 overflow (Frank Tang)
https://chromium.googlesource.com/chromium/deps/icu/+/85814e1

CP two ICU security patches (Frank Tang)
https://chromium.googlesource.com/chromium/deps/icu/+/a47bd43

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,ftang@chromium.org

Change-Id: I2719b470184f94ad06b1920f0649628be3c93bf5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3615243
Bot-Commit: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
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Change-Id: I29bcdf3302f37568e8c8925e70a01ba342c17925
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3606229Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80288}

This reverts commit 91453880.

Reason for revert: Breaking the Fuchsia Deterministic Builder

Original change's description:
> Reland "[osr] Use the new OSR cache"
>
> This is a reland of commit 91da3883
>
> Fixed: Use an X register for JumpIfCodeTIsMarkedForDeoptimization
> on arm64.
>
> Original change's description:
> > [osr] Use the new OSR cache
> >
> > This CL switches over our OSR system to be based on the feedback
> > vector osr caches.
> >
> > - OSRing to Sparkplug is fully separated from OSR urgency. If
> >   SP code exists, we simply jump to it, no need to maintain an
> >   installation request.
> > - Each JumpLoop checks its dedicated FeedbackVector cache slot.
> >   If a valid target code object exists, we enter it *without*
> >   calling into runtime to fetch the code object.
> > - Finally, OSR urgency still remains as the heuristic for
> >   requesting Turbofan OSR compile jobs. Note it no longer has a
> >   double purpose of being a generic untargeted installation
> >   request.
> >
> > With the new system in place, we can remove now-unnecessary
> > hacks:
> >
> > - Early OSR tierup is replaced by the standard OSR system. Any
> >   present OSR code is automatically entered.
> > - The synchronous OSR compilation fallback is removed. With
> >   precise installation (= per-JumpLoop-bytecode) we no longer
> >   have the problem of 'getting unlucky' with JumpLoop/cache entry
> >   mismatches. Execution has moved on while compiling? Simply spawn
> >   a new concurrent compile job.
> > - Remove the synchronous (non-OSR) Turbofan compile request now
> >   that we always enter available OSR code as early as possible.
> > - Tiering into Sparkplug no longer messes with OSR state.
> >
> > Bug: v8:12161
> > Change-Id: I0a85e53d363504b7dac174dbaf69c03c35e66700
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3596167
> > Commit-Queue: Jakob Linke <jgruber@chromium.org>
> > Auto-Submit: Jakob Linke <jgruber@chromium.org>
> > Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> > Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#80147}
>
> Bug: v8:12161
> Change-Id: Ib3597cf1d99cdb5d0f2c5ac18e311914f376231d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3606232
> Auto-Submit: Jakob Linke <jgruber@chromium.org>
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#80167}

Bug: v8:12161
Change-Id: I73e2d98660e9edfbe07a152a14402380ea9227de
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3615219Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
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Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#80287}

During weak processing we remember weak callbacks for objects in the old
generation. We should check the young-gc flag and enable generational GC
before weak processing, as otherwise we would miss the callbacks and
forget to update the weak refs.

Bug: chromium:1029379
Change-Id: I72c98d4926b57c36af6cc503ce34712f67d50f42
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616721Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80286}

Bug: v8:12797
Change-Id: I2e7f7812b47882766d5accb1963301e7c0731fcd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616725Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80285}

opcodes are already defined under the instruction-selector.

Change-Id: Ib8cc1d3b7d8e3f1725306b12450f43c2aff1ae83
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616722Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80284}

This is a reland of commit b36c87e3.
Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux%20-%20noi18n%20-%20debug/42210/overview.

This CL moves cctest/test-regexp to unittests/regexp/regexp-unittest and
updates unittest.status file for test-regexp.

Original change's description:
> [test] Move cctest/test-regexp to unittests
>
> ... /regexp/regexp-unittest.
>
> Bug: v8:12781
> Change-Id: I3c3ba4c519ff503b242c39d0e3b2350f25d7e84c
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3607370
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: 王澳 <wangao.james@bytedance.com>
> Cr-Commit-Position: refs/heads/main@{#80217}

Bug: v8:12781
Change-Id: I8e08147f21feb1e97b681204bc5b771794c3768f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3612663Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#80283}

Introduce get_hints.py and combine_hints.py in order to make
the interpretation of basic block counts into hints more
configurable and explicit, as well as allowing more accurate
and consistent methods of combining multiple profiles.

get_hints.py allows for the minimum count and threshold ratio
values to be easily altered for different profiles, while
combine_hints.py allows the hints produced from different
benchmarks and threshold values to be easily and sensibly
combined.

Simply summing together basic block counts from different
benchmarks could previously lead to a longer running benchmark
overshadowing multiple shorter benchmarks with conflicting
hints.

Allowing alteration of the current threshold values gives a
doubling of performance, while the new method of combining
distinct profiles can double the performance improvement of the
secondary benchmark while losing as little as 4% of the
improvement gained in the primary benchmark.

Design doc: https://docs.google.com/document/d/1OhwZnIZom47IX0lyceyt-S9i8AApDB0UqJdvQD6NuKQ/edit?usp=sharing

Bug: v8:10470
Change-Id: I1c09d1eabfdda5ed6794592e2c13ff8b461be361
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545181Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: George Wort <george.wort@arm.com>
Cr-Commit-Position: refs/heads/main@{#80282}

The CL uses the different scheme to enable the generational barrier. The
separate global counter (is_enabled_) keeps track of the number of heaps
that enable generational GC. If at least one of the heaps enables the
generational GC, the counter will enable the write barrier. Technically,
the counter could be merged with WriteBarrier::is_enabled_, but having a
separate variable allows us to keep DCHECKs if generational barrier is
enabled.

Bug: chromium:1029379
Change-Id: Iafaa76f96acb18a73f8bde7231434e68c04cb683
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616518Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80281}

Change-Id: I7ba5cd6cf1c76f0955b3ad7184af0a9245f66657
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3613765
Commit-Queue: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#80280}

This make it easier to follow which function was compiled when many
maglev graphs are outputted.

Bug: v8:7700
Change-Id: If88f6d4aa7306df8a26601f081105bff0eb9c5e8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616513
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80279}

Bug: v8:7700
Change-Id: Ia76a091e013aa7649da132c113fcefef06534f3b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616511
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80278}

Bug: chromium:1320784
Change-Id: I7057e294913d3305784af6fc610be250d6431082
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616509
Commit-Queue: Samuel Groß <saelo@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80277}

The builtin CreateEmptyArrayLiteral actually expects the feedback
slot as an smi.

Bug: v8:7700
Change-Id: Ib33c3d0abd626ccbc43b4aff2f1cf69a81ff6568
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616506
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80276}

Similar approach as Call (from RegisterList).

Bug: v8:7700
Change-Id: Ifc94e2bf53f40a8f556d30d85c2354f8d3a2af1b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616502
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80275}

The CL introduces a new option --cppgc-young-generation. This option
can't be enabled statically, because V8 options are parsed after heap
initialization. The CL changes minor GC so that it can be enabled
dynamically. The way it works is as follows:
- the user calls YoungGenerationEnabler::Enable();
- a heap checks in the next atomic pause whether the flag was enabled;
- if so, the heap enables young generation for itself.

To avoid barrier regressions without young-generation enabled, the CL changes the meaning of the global flag is-any-incremental-or-concurrent-marking to is-barrier-enabled.

The runtime option would enable us to test young generation on try-
and performance-bots.

Bug: chromium:1029379
Change-Id: I664cccdcd208225ffcbf9901f1284b56d088c5c3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3607993
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80274}

This reverts commit 445190bf.

Reason for revert: Speculative revert for https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux%20-%20gc%20stress/38224/overview

Original change's description:
> [heap] Fix bogus object size computation
>
> The map of an object may be gone by the time we try to compute its
> size for accounting purposes.
>
> Bug: chromium:1319217
> Change-Id: I93cca766a8cedebf4ed30a3a65fd6eff5bc72bcf
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3605817
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#80271}

Bug: chromium:1319217
Change-Id: I04139a4b469649a7f689643f949b106cd97dc94b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616503
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Owners-Override: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80273}

Doc: https://bit.ly/revive-restart-frame

This CL adds the V8 debugger part of the restart frame logic as well
as some bits for the inspector.

The CL is centered around two key pieces: When the user requests a
restart, we stash the stack frame ID (aka the stack pointer) and
optionally the inlined frame index for optimized frames, and then
continue execution. Once execution bubbles back into JS land,
we throw a termination exception when a frame restart was requested.

Note that the CL doesn't hook up the logic yet to CDP and the CL
also does not the actual handling of the termination exception
in the unwinder.

R=bmeurer@chromium.org, kimanh@chromium.org

Bug: chromium:1303521
Change-Id: I12cfb408c66072dd19f8180e530f84c987d1374d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3613383Reviewed-by: Kim-Anh Tran <kimanh@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80272}

The map of an object may be gone by the time we try to compute its
size for accounting purposes.

Bug: chromium:1319217
Change-Id: I93cca766a8cedebf4ed30a3a65fd6eff5bc72bcf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3605817Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80271}

array_buffer is not used by https://chromium-review.googlesource.com/c/v8/v8/+/3605611 ,so should delete USE(array_buffer).
And riscv64: Enable atomic ops in TF bultins

Change-Id: Ie8ffd3009bfacdbe67a8fe1e417388add70fc296
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616169Reviewed-by: Marja Hölttä <marja@chromium.org>
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80270}

Change-Id: I23376b2ad0dc8616048f8c9c7122d5bf38fa70d8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3615013
Commit-Queue: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#80269}

- Rely on GCCallbacksScope to avoid nesting callbacks.
- Use a single entrypoint consistently for all callsites.

Change-Id: I6be1f749a2d6bfc9d5db4c84c753e9176472bce2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3605821Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80268}

This reverts commit a3f66927.

Reason for revert: test failures on TSAN/no-concurrent-marking bot:
https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20no-concurrent-marking/8549/overview

Original change's description:
> [heap] Refactor atomic marking phase
>
> The atomic marking phase was organized in many distinct smaller
> phases. In particular, before http://crrev.com/c/3584115 the marking
> phase split into two large separate phases.
>
> This CL reorganizes marking into two phases that perform regular V8
> heap marking, Oilpan, and ephemerons:
> - A parallel phase that likely drains all marking worklists;
> - A single-threaded final phase to catch any left overs;
>
> This avoids artificial splitting in phases and also avoids repeated
> starting and joining of jobs.
>
> Change-Id: I5cccfc5777837d9ece10d8f4925781bf2d07d9da
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3602507
> Reviewed-by: Omer Katz <omerkatz@chromium.org>
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#80265}

Change-Id: I4838e9316bd30f8a0b78fa6a27820d3457e1e579
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3614972
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80267}

Change-Id: Iae749161f5a6f2347a64f45579d9bd9d5e0ccaf6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3613387Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#80266}

The atomic marking phase was organized in many distinct smaller
phases. In particular, before http://crrev.com/c/3584115 the marking
phase split into two large separate phases.

This CL reorganizes marking into two phases that perform regular V8
heap marking, Oilpan, and ephemerons:
- A parallel phase that likely drains all marking worklists;
- A single-threaded final phase to catch any left overs;

This avoids artificial splitting in phases and also avoids repeated
starting and joining of jobs.

Change-Id: I5cccfc5777837d9ece10d8f4925781bf2d07d9da
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3602507Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80265}

Port b0118171

Original Commit Message:

    This CL adds a new builtin called "RestartFrameTrampoline". This
    trampoline is relatively simple: It leaves the current frame and
    re-invokes the function. This essentially restarts the function and
    is one of the key components required to bring back the "Restart
    frame" DevTools debugging feature.

    The builtin is closely related to the "FrameDropperTrampoline"
    removed in the CL https://crrev.com/c/2854750. The key difference
    is that the "FrameDropperTrampoline" dropped to an "arbitrary"
    frame pointer before restarting the function (arbitrary in the
    sense that it was provided as an argument). This caused issues
    as the feature was implemented in a way that the frame pointer
    wasn't necessarily valid anymore.

    In comparison, the "RestartFrameTrampoline" relies on the V8
    unwinder to drop it in the correct frame first and is then
    invoked via either the CEntry stub or the deoptimizer
    (see design doc for details).

R=szuend@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: Id742eeaa59a540ec206a92308fb72bb50413e267
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3613391Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#80264}