It is possible for IncrementalMarkingJob to be scheduled while MajorMC
is running, but it only gets to run after MajorMC finished.

If concurrent MinorMC is run in the meantime, RunInternal should not
invoke Step, which is currently only supported for MajorMC. This CL adds
a bailout for this case.

Bug: v8:13012
Change-Id: I3012cac3de5195a9f1b85f1ac18b02cef67b004b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867516
Commit-Queue: Leon Bettscheider <bettscheider@google.com>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82903}

Bug: v8:13247
Change-Id: Ia1e82ef106914481e20076ac1ada9ba79e23c5a2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865547Reviewed-by: Patrick Thier <pthier@chromium.org>
Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Patrick Thier <pthier@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82902}

This is a reland of commit 3297ccca

This is a straight-up reland of the original CL. The failing test
was flaky and removed with https://crrev.com/c/3868727. We replaced
the test with a proper DevTools e2e test: https://crrev.com/c/3867522

Original change's description:
> [debug] Immediately step-in for 'stack check triggered' debug breaks
>
> This CL changes debug breaks that are triggered via interrupts (i.e.
> via stack check). One client of this behavior is the `Debugger.pause`
> CDP method.
>
> The problem is that when we pause so early, the JSFunction didn't have
> time yet to create and push it's context. This requires special
> handling in the ScopeIterator and makes an upcoming change unnecessary
> complex.
>
> Another (minor) problem is that local debug-evaluate can't change
> context-allocated local variables (see changed regression bug). Since
> the context is not yet created and pushed, variables are written to
> the DebugEvaluateContext that goes away after the evaluation.
>
> The solution is to mirror what `BreakOnNextFunction` does. Instead
> of staying paused in the middle of the function entry, we trigger
> a "step in" and pause at the first valid breakable position instead.
> This ensures that the function context is already created and pushed.
>
> Note that we do this only in case for JSFunctions. In all other cases
> we keep the existing behavior and stay paused in the entry.
>
> R=jgruber@chromium.org
>
> Fixed: chromium:1246907
> Change-Id: I0cd8ae6e049a3b55bdd44858e769682a1ca47064
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3854501
> Reviewed-by: Jakob Linke <jgruber@chromium.org>
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82817}

Change-Id: I1938ccb5979fd80dff530b2ffe3f18714b7eff3f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867727
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82901}

Bug: v8:13091,v8:13253
Change-Id: I9a40a937e2774a62e607d792256fdd34e8a634f6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867735
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82900}

Add a mechanism similar to the optimizing compile dispatcher, for tests
to be able to wait for Maglev compilation to finish, and to force
finalization.

Bug: v8:7700
Change-Id: I0ef542001fe9f6622b1231eb9406130ad81c8f6e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865551
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82899}

Bug: v8:13247
Change-Id: I8fd1fe179accc0ca37d32b737a5cfac2a736e1a2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865553
Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82898}

New Flags added:
--log-source-code
--log-source-position
--log-feedback-vector

With the above flags we can choose between detailed or lightweight
logging.

Drive-by-fix:
- Use std::isprint
- Add AppendRawString to avoid vprintf formatting for raw strings


Change-Id: I3e9eda8473153de9620d24617c5a5e12e2e3bd56
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3863469
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82897}

... which works for stale pointers. The default == operator contains
a DCHECK guarding against Code vs. non-Code object comparisons and
thus it can't be used for stale pointer.

Bug: v8:13252, v8:11880
Change-Id: Iaf80d7d1039515fee0d4d294f1fc4c6689cd8d5c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867734
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82896}

This CL skips the MarkingFromInternalFields write barrier when
MinorMC concurrent marking is active, because we do not run Oilpan
young GCs yet.

Bug: v8:13012
Change-Id: Ib73dea8357be6d135290009258b5d172477a633b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865464Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Leon Bettscheider <bettscheider@google.com>
Cr-Commit-Position: refs/heads/main@{#82895}

Bug: v8:7700
Change-Id: I784d28b8ee043a4fa2478dbaaf7412a0708b811c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867732Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82894}

This is a reland of commit ddafb7a3

CL is relanded without changes. https://crrev.com/c/3865965 and
https://crrev.com/c/3865967 fixed the failing DCHECKs that caused
this CL to be reverted.

Original change's description:
> [heap] Verify client heaps during shared GC
>
> With --verify-heap verify all client heaps before and after a shared
> GC. This ensures that the OLD_TO_SHARED remembered set is properly
> filled for each client isolate.
>
> Bug: v8:11708
> Change-Id: I1506a419c7a91c5baa87ce251da9861d8ad9e066
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3857559
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82829}

Bug: v8:11708
Change-Id: I38bd6724807fee36bc47d70b0d83156b81a2b4fd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865968
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82893}

Bug: v8:7700
Change-Id: Id417c068ea6df04c43823f32b60531d7588dcd1f
Fixed: chromium:1358655
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865552Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82892}

Currently MinorMC does not suport incremental marking but uses the
IncrementalMarking class to bootstrap concurrent marking.

IncrementalMarkingJob::ScheduleTask is called from multiple call
sites which assume major incremental marking. This CL adds a bailout
to ScheduleTask on IsMajorMarking()==false to avoid erreoneously
doing incremental steps while in MinorMC mode.

Bug: v8:13012
Change-Id: I57803a8f258697478a9696716063c8c2cae1ae30
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865147Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Leon Bettscheider <bettscheider@google.com>
Cr-Commit-Position: refs/heads/main@{#82891}

This CL removes two DCHECKs which no longer hold with minor
concurrent marking.

Bug: v8:13012
Change-Id: I6f24284f0955c57deeb2fa2c300623d9aedfdd3c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865463Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Leon Bettscheider <bettscheider@google.com>
Cr-Commit-Position: refs/heads/main@{#82890}

R=yahan@iscas.ac.cn

Bug: v8:13191
Change-Id: I8c7ccb90c4e8a5b8ca5d88fc11c99fbe876621bc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3831142Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Yahan Lu <yahan@iscas.ac.cn>
Commit-Queue: Yahan Lu <yahan@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#82889}

Bug: v8:11263
Change-Id: Ia53518d52f906c96afafc084af99679bd64b46fa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3866177
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82888}

Some wasm simd unit tests are not guarded by V8_ENABLE_WEBASSEMBLY,
it will cause test failure on no-wasm build.

Change-Id: Ib08e133f979e492ca620191d799f641bdb0f60bd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3866706Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jie Pan <jie.pan@intel.com>
Cr-Commit-Position: refs/heads/main@{#82887}

We've previously reset profiler ticks on ML finalization to avoid
unexpected early tierups to TF. This CL additionally avoid early TF
tierup through the `small function` reason by disabling small-function
optimization.

Bug: v8:7700
Change-Id: I57ba294af0d1d189f76c2cb1ffc31af0837b1e42
Fixed: v8:13242
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865550
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82886}

Emit an unconditional deopt if a BinOp/CompareOp has insufficient
feedback, rather than emitting a generic op.

Bug: v8:7700
Change-Id: I3e47d82716a8fe7832cc179e949d689b9aef14e2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867731
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82885}

... for PC-relative builtin calls/jumps and explicitly use near_call /
near_jump instructions.

This is a step towards
1) removing the RelocInfo::RUNTIME_ENTRY which was temporarily used
   for this purpose,
2) being able to remap embedded builtins into the code range multiple
   times.

Bug: v8:11527
Change-Id: Ife26c8bbc524be0b07f333776716f22bd4bd36aa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3866190
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82884}

Port commit ed90ea5c

Bug: v8:7700
Change-Id: I8cec07b2fe971287895c89b91436d0f1223cf89a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3868527
Auto-Submit: Liu Yu <liuyu@loongson.cn>
Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/main@{#82883}

.. and update old entries:

- Remove --no-untrusted-code-mitigations (flag no longer exists)
- Make --stress-concurrent-inlining-attach-code less likely since it
  mostly overlaps with --stress-concurrent-inlining and there haven't
  been many reports in this are lately.

Bug: v8:7700
Change-Id: Ic88ea74ca88a7c14edfc39bc0a55b846bb01e465
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867506Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82882}

Introduce an inspector client interface method for running an
"instrumentation pause" (when an instrumentation breakpoint is hit).
This allows the client to run a more restrictive version of message
pumping on instrumentation breakpoint hits.

If not overriden, the instrumentation pause message loop handler will
run the normal message loop. Such an implementation preserves the
behavior for existing clients.

Bug: chromium:1354043
Change-Id: Id33bb10503d73b59b24e63fd9d24631611f68dee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3863256Reviewed-by: Kim-Anh Tran <kimanh@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82881}

Changes:
- Limit how often a function can be inlined, mostly to constrain
  recursive-function inlining.
- Move call count limiting earlier (to WasmInliner::ReduceCall), and
  guard it behind the flags that are required to generate call counts.

Bug: v8:12166
Change-Id: Ie3c140daff110e08fe7103ee79393ea27ae49bb2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865918Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82880}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/d74c524..252971c

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/src/buildtools/+log/69f262d..c24a0d5

Rolling v8/buildtools/linux64: git_revision:5705e56a0e5856621415cfdf444432554e72c9c9..git_revision:00b741b1568d56cf4e117dcb9f70cd42653b4c78

Rolling v8/buildtools/third_party/libc++/trunk: https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx/+log/e5670a0..42e738f

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/6552f9b..638d30e

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/b0fb8d5..5084800

Rolling v8/third_party/fuchsia-sdk/sdk: version:9.20220830.2.1..version:9.20220831.2.1

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

Change-Id: Ic2b31700344a5e433521362408949fa382ae0d2c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865743
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#82879}

Port commit ed90ea5c
Port commit ed90ea5c
Port commit ab5db111d0329cb0954c110a8cc67b9793b2bb8f

Change-Id: I7981793d7f38d3769a1c9fdca23b7607d7772089
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867138
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Commit-Queue: ji qiu <qiuji@iscas.ac.cn>
Reviewed-by: ji qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#82878}

Port commit af62c4f0

Bug: chromium:1246907, chromium:1357554
Change-Id: Ia54fd08719827a2d58ff81ef7e243a3a365ffb55
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867135
Auto-Submit: Liu Yu <liuyu@loongson.cn>
Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Liu Yu <liuyu@loongson.cn>
Cr-Commit-Position: refs/heads/main@{#82877}

This CL removes dependence on the ForegroundTaskRunner in the shared
isolate because the shared isolate doesn't have one associated with it.

There are 3 places:

1. The memory reducer is no longer allocated on the shared isolate.

2. The WasmEngine is no longer initialized for the shared isolate, which
   never executes user code.

3. Ability to post non-nestable tasks is no longer required on the
   shared isolate. This is required for FinalizationRegistry, and
   the shared isolate never executes user code.

Bug: v8:11708
Change-Id: I4b0cf2c8dc8686ccc7b7d24e6c9e12eb4b9d03d6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3864275
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82876}

Change-Id: Ife29e300d51058a19e4b568cb8d335f26a7556e2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3863806
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82875}

We fixed the test earlier but forgot to remove the SKIP.

Bug: v8:11544
Change-Id: I6594dc2ad07fe88fdc2ed9bfaa0f0715bc14930b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867132Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82874}

Add test for ensuring that page promotion records old-to-shared slots
during a full GC.

Bug: v8:11708
Change-Id: Id2eb77a623c84586cad61d72bb80479ef69e3b29
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3866176
Auto-Submit: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82873}

If we see a default ctor, walk up the constructors until we find a non-
default one.

Default ctors can only be skipped if there are no class fields / private
brands.

This CL implements the Ignition parts; Sparkplug, Maglev and TF will
be implemented as follow ups. (This is fine, since this feature is
behind a flag.)

Bug: v8:13091
Change-Id: Ie8ca8aedb01bd4b13adf1063332a5cdf41ab358a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804601Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82872}

Bug: v8:7748
Change-Id: I4057a9288fe3d2dc0df308ce51be92e417572bd1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865483Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Matthias Liedtke <mliedtke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82871}

This CL has two changes:

1. Remove ValueDeserializer::Delegate::SupportsSharedValues. Only
   ValueSerializer::Delegate needs to report whether it supports
   serializing shared values. The ValueDeserializer::Delegate should
   DCHECK if it gets a shared object tag but it doesn't support it.
   This better mirrors what happens with SharedArrayBuffer transfers
   currently.

2. When attempting to serialize a shared object (shared struct, shared
   array, Atomics.Mutex, or Atomics.Condition) when
   !SupportsSharedValues(), throw instead of assert. This is for better
   ergonomics.

Bug: v8:12547
Change-Id: I2bb66830393526578016813c4e3488859dd07073
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3866302
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82870}

Rename BytecodeOperandFlag to BytecodeOperandFlag8. The methods in
interpreter-assembler were missed in https://crrev.com/c/3857561.

Change-Id: I09383531e4d16e6e428a56feb76192156211dc81
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3867515
Commit-Queue: Patrick Thier <pthier@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82869}

When an entry is allocated from the freelist, is is not correct to
`DCHECK(entry.IsFreelistEntry())` before the compare-and-swap succeeds:
another thread may have allocated the same entry in the meantime,
thereby turning it into a regular entry. However, in that case the CAS
will fail and then entry allocation will be retried.

Drive-by: factor out the common logic from AllocateAndInitializeEntry
and AllocateEvacuationEntry into a new TryAllocateEntryFromFreelist.

Bug: v8:13246
Change-Id: Idf16b67a2ca5ddeef16620a4d6f4a8a6c07d917b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865864Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82868}

Some optimizations need to know if an operation has multiple uses,
for example to avoid extending live-ranges.
However, maintaining full use-lists is expensive memory-wise and
not really needed in this case, where we only need to distinguish
between 1 or more uses.
Therefore, we only count the number of uses. To save even more memory,
we use the 1 byte currently left for alignment padding in the
operation header and put the count there.
With a single byte, we cannot count beyond 255, but for the use-case
at hand, this is enough. When reaching 255, we no longer track the
use-count.
Nodes with so many uses should be rare and their use-count will usually not go down to 1 again, so this does not loose much precision.

Another possible future use of these counts is reserving memory for
full use-lists.

This CL also removes mutable access to node inputs, as this would need
to update use-counts and is not actually needed currently.

Bug: v8:12783
Change-Id: Idd2035c6f8ced6317e3aec0c42eecd1383e86248
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3863266
Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82867}

Bug: v8:10391
Change-Id: I567f94800119a9afd3f684134a6f4885026f813e
Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3859347
Commit-Queue: Samuel Groß <saelo@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82866}

Bug: v8:12783
Change-Id: I97f6a28bfef7c9aed679c84f33d60a71cf467718
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3859327Reviewed-by: Darius Mercadier <dmercadier@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82865}

Bug: v8:7700
Change-Id: I7bdb64c5a8c73aefd19c972337d488de2103ad13
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865320
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82864}