The number of feedback vector slots is currently stored in the
{WasmFunction}, returned in the {WasmCompilationResult}, and implicitly
stored as the size of the {call_targets} vector in
{FunctionTypeFeedback}.
This CL uses the latter as the source of truth, encapsulated in a new
{NumFeedbackSlots} function. This can be updated when adding new kinds
of feedback that need additional slots.
For now, the implementation of {NumFeedbackSlots} requires taking a
mutex, which we can hopefully avoid when productionizing speculative
inlining. We also take the mutex on every Liftoff compilation, which
adds synchronization between concurrent compilation which we previously
tried very hard to avoid (because it introduced significant overhead for
eager compilation).
As a nice side-effect, this CL reduces the per-function overhead by 8
bytes, independent of enabled features.
R=jkummerow@chromium.org
Bug: v8:13209
Change-Id: I2fe5f7fe73154328032a3f0961e88d068c5d07ae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3899299
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83253}
The cached template object weakmap shouldn't be updated when we update
an existing cached template object, because this update can truncate the
linked list of cached template objects.
Bug: v8:13190
Change-Id: Icea61fcbd5c05d4293a884d1872523ddcdfc3323
Fixed: chromium:1364429, chromium:1364471
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3899256
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83248}
This is a reland of commit 0a1f0e335e
Changes since revert:
- Deferred label for loading from forwarding table.
- Check if hash is computed instead of checking if it is a forwarding index.
- Retreive hash from forwarding table only if hash is assumed to be computed.
Original change's description:
> [strings] Fix raw hash lookup for forwarded strings
>
> Raw hashes may need to be looked up via the forwarding table when
> internalized strings are forwarded to external resources. Notably, the
> megamorphic ICs were not correctly fetching the raw hash.
>
> Bug: v8:12007
> Change-Id: Ibbc75de57e707788f544fbd1a0f8f0041350e29d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3885379
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Reviewed-by: Patrick Thier <pthier@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#83115}
Bug: v8:12007
Change-Id: Ia88ed51a49c62170bc960b8f69673bb1e59a6009
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3888057
Commit-Queue: Patrick Thier <pthier@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83246}
This reverts commit 80fb281561.
Reason for revert: https://bugs.chromium.org/p/chromium/issues/detail?id=1364400
Original change's description:
> [turbofan] Rematerialize BigInt64 in deopt
>
> This CL introduces two MachineTypes - SignedBigInt64 and UnsignedBigInt64, which are represented as Word64 but will be rematerialized to BigInt in deoptimization. This will avoid unnecessary conversions for BigInt64s when they are passed to StateValues.
>
> Bug: v8:9407
> Change-Id: I65fdee3e028ed8f9920b1c20ff78993c7784de48
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3858238
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
> Commit-Queue: Qifan Pan <panq@google.com>
> Cr-Commit-Position: refs/heads/main@{#83230}
Bug: v8:9407
Change-Id: I77d278ce302621db03b787318641709780348cc8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3901814
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#83245}
This reverts commit 4444874cdf.
Reason for revert: CHECK failure under UBSan
https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64%20UBSan%20-%20builder/5103/overview
Original change's description:
> [v8] Use |AllocateAtLeast| for resizing v8 zones.
>
> This is part of an ongoing effort to reduce fragmentation in Chrome. Partition alloc shows v8 zones are a large user of memory in Renderer processes, and that there is fragmentation from these allocations. This CL will reduce this fragmentation by allowing v8 to use all allocated memory for its zones.
>
> Bug: v8:13193, chromium:1238858
> Change-Id: Ibeac8bdba9d0e7ff66b14a3dde10e7c87d3cf953
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3889361
> Reviewed-by: Adam Klein <adamk@chromium.org>
> Commit-Queue: Thiabaud Engelbrecht <thiabaud@google.com>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#83235}
Bug: v8:13193, chromium:1238858
Change-Id: I03c8c1ad7bb1cd20770323bffe1c42a4be47c454
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3900814
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83237}
Need to reset tzi_xxx and calendar_xxx in parser state if the
post-condition of CalendarName and TimeZoneIdentifier is not met.
Bug: v8:11544
Change-Id: If2df6c8fc8cf2418ddd5443abab02066d423a0c3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3893554
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83236}
This is part of an ongoing effort to reduce fragmentation in Chrome. Partition alloc shows v8 zones are a large user of memory in Renderer processes, and that there is fragmentation from these allocations. This CL will reduce this fragmentation by allowing v8 to use all allocated memory for its zones.
Bug: v8:13193, chromium:1238858
Change-Id: Ibeac8bdba9d0e7ff66b14a3dde10e7c87d3cf953
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3889361
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Thiabaud Engelbrecht <thiabaud@google.com>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83235}
This CL introduces a new LookupIterator state WASM_OBJECT, and updates
all switches that need to handle it.
Bug: v8:7748
Change-Id: Ie3359aed2d37f5a6854e5577fa3799f0464391e4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865559
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83234}
The split is rudimental and now is not needed at all:
- as part of the shared-cage effort we added HeapHandle pointer to the
BasePageHandle class (on the API side);
- for the value-full barrier we get HeapHandle from bitmasking the
value;
- for the value-less barrier we get it from the callback provided by the
caller.
The CL entirely removes the split and uses the single
BoundedPageAllocator. A minor note: the conservative stack scanning can
become sligthly more expensive.
Bug: chromium:1361582, chromium:1325007
Change-Id: I2a8aded3dd12037998f36341c68af8e23b0dcd88
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3899320
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83232}
Since enabling the sandbox is now required for example for mkgrokdump,
add it to the default gn args. Also treat non-sandbox builds as
"non-shipping" in mkgrokdump.cc
Bug: v8:13281
Change-Id: I08042aa53057e25c556e166c059373e2fdb9d2c1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3899317
Commit-Queue: Samuel Groß <saelo@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83231}
This CL introduces two MachineTypes - SignedBigInt64 and UnsignedBigInt64, which are represented as Word64 but will be rematerialized to BigInt in deoptimization. This will avoid unnecessary conversions for BigInt64s when they are passed to StateValues.
Bug: v8:9407
Change-Id: I65fdee3e028ed8f9920b1c20ff78993c7784de48
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3858238
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Qifan Pan <panq@google.com>
Cr-Commit-Position: refs/heads/main@{#83230}
Inner pointer resolution, to be used in conservative stack scanning,
assumes that all pages registered with the memory allocator are
iterable. Until this CL, this was not the case for pages that were
owned by the young generation semispaces but were unused. Such pages
are either in the "from" semispace, or in the "to" semispace but have
not yet been used.
This CL ensures that all pages owned by the young generation are iterable. It also adds tests to verify that inner pointer resolution
works correctly for unused young pages and for pointers above the
page area.
Bug: v8:13257
Change-Id: Ieff7cc216853403e01f83220b96bf8ff4cdea596
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3885893
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Nikolaos Papaspyrou <nikolaos@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83226}
This test observes GC behavior and needs the garbage collector to work
in a somewhat predictable way.
Bug: v8:13286
Change-Id: I24e6a4f33a644b5f1845cd34558da03fc196f7e5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3898721
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83218}
Avoid the deprecated FLAG_* syntax, access flag values via the
{v8_flags} struct instead.
R=szuend@chromium.org
Bug: v8:12887
Change-Id: I8123d18ae852807557bf26b1308e0061dc1ac123
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3898937
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83216}
Avoid the deprecated FLAG_* syntax, access flag values via the
{v8_flags} struct instead.
R=jgruber@chromium.org
Bug: v8:12887
Change-Id: I0454426c664e54e9b8c8b39f903eeca1a80d4bc2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3898933
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83214}
The kContextRegister can alias allocated registers - when setting it,
take care not to unintentionally clobber.
Bug: v8:7700
Change-Id: I0635d334fb14fa15540582a4873d4186fffa2199
Fixed: chromium:1363450
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3897634
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@{#83212}
Running the libfuzzer fuzzers locally (with an experimental flag turned
on) found crashes, but did not produce crash files because we were
generating a software interrupt ("trap") instead of properly aborting.
Disabling the "hard-abort" feature fixes that.
This will hopefully not flush out previously missed crashes. If so,
please do manually bisect across this CL, instead of assigning to me :)
Drive-by: Move more initialization logic from {InitializeFuzzerSupport}
to the {FuzzerSupport} constructor, where other similar work is
performed.
R=thibaudm@chromium.org, saelo@chromium.org
Bug: v8:13283
Change-Id: Id8d4e92f5ab6bb27676adeae6b3b1eb042b8ba3e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3892061
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Samuel Groß <saelo@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83208}
Temporaries and the allocated result register may alias, thus order is
important when setting the result value.
Fixed: TestUndetectable, LogicalNot, SetPendingMessage.
Drive-by: Pass Label::kNear in a few spots I passed by.
Bug: v8:7700
Change-Id: Ice3de1d1014ad05d8fa9fb18d967887386bfed0d
Fixed: chromium:1359723
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3898530
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83207}
Correct the call the the one which take the UTC based time
instead of the one taking the local wall time.
Bug: v8:11544
Change-Id: Ib288617e8f98b21865c306ca36cd905a3e5315bd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3892639
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83205}
A couple of customers have asked about using devtools to get information
about temporary allocations, with the goal of reducing GC time and/or
peak memory usage. Currently, the sampling heap profiler reports only
objects which are still alive at the end of the profiling session. In
this change, I propose adding configuration options when starting the
sampling heap profiler so that it can optionally include information
about objects which were discarded by the GC before the end of the
profiling session. A user could run the sampling heap profiler in
several different modes depending on their goals:
1. To find memory leaks or determine which functions contribute most to
steady-state memory consumption, the current default mode is best.
2. To find functions which cause large temporary memory spikes or large
GC pauses, the user can request data about both live objects and
those collected by major GC.
3. To tune for minimal GC activity in latency-sensitive applications
like real-time audio processing, the user can request data about
every allocation, including objects collected by major or minor GC.
4. I'm not sure why anybody would want data about objects collected by
minor GC and not objects collected by major GC, but it's also a valid
flags combination.
Change-Id: If55d5965a1de04fed3ae640a02ca369723f64fdf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3868522
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#83202}
When regenerating v8heapconst.py, the v8 sandbox now has to be enabled
explicitly (using the v8_enabe_sandbox=true gn arg) as it is enabled by
default in Chromium builds, but not standalone v8 builds.
Bug: v8:13281
Change-Id: I1a0861b1d63f340465d7433e042b27eace706ca7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3895622
Commit-Queue: Adam Klein <adamk@chromium.org>
Auto-Submit: Samuel Groß <saelo@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83201}
Check whether the exception phi for the accumulator (i.e. the exception
message object) is dead, and don't assign rax to it if yes. Note that
maglev node liveness can differ from bytecode liveness, since the
bytecode accumulator could have been considered "live" just because of a
move to a (dead) register.
Bug: v8:7700
Change-Id: If1384284f6f55a565e2ae94e5e7a32455fdedb93
Fixed: chromium:1359382
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3892353
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83197}
Use Script as the key for the template object cache, instead of the
SharedFunctionInfo. This is because SharedFunctionInfos can be garbage
collected and then later recompiled, which would mean that we break the
spec's expectation that the template object stays constant.
Now the association of cached template object with SharedFunctionInfo is
via the function_literal_id of the SharedFunctionInfo, stored on the
CachedTemplateObject. These are linearly searched, similar to the linear
search over slot ids.
Bug: v8:13190
Change-Id: I3f67811c16ea4cd39c99b2fa034aa7e1f03c171e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3892787
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83195}
SimulateFullSpace starts with no LAB, iterates over pages and allocates
all free space on each page. After the first page, the LAB is empty but
is no longer null.
Bug: v8:12612
Change-Id: I2c00b9ba68fdd5f60eda086ea940cb6e211a986e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3891294
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83186}
Before, import and export wrappers were cached based on their
signature. This change
- makes wrapper canonicalization consistent with that of types and
call_indirect signatures under --wasm-type-canonicalization,
- removes the last uses of signature maps, which will enable us to
remove them in a future CL.
Change-Id: I512bc234f0ae10e50bd94237e8e675ca47ed13c5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3891250
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83183}
Ignition remembers the correct context to restore when entering an
exception handler by moving the context to an interpreter register
when entering a try block, and restoring it from there when unwinding
the frame and entering the catch block.
Maglev code has to do the same by taking the context from the
appropriate register for the handler's frame state.
Bug: v8:7700
Change-Id: I294fcccc845c660b2289b6d7b40f49f1aa46283d
Fixed: chromium:1359928
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3892352
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83181}
Trap if the suspender argument provided to the JSPI import
wrapper is invalid.
For now, the suspender argument is expected to be the active
suspender. In the future, it will also be possible to suspend
to a parent of the current suspender. This will only be possible
once wasm-to-wasm suspending wrappers are supported, or if and
when JSPI suspenders become compatible with their core
stack-switching counterpart (e.g. Fibers in the fiber proposal).
R=jkummerow@chromium.org
Bug: v8:12191
Change-Id: I650454ed076bd251b0aa18656774d4c4b2d3bfdc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3892697
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83173}
1. Return null if the transition is out of bound.
2. Remove incorrect MAYBE_RETURN which is handled by the IsNothing check.
Bug: v8:11544
Change-Id: Ia54f68831120bd2460cb813464168b1a2c92da3d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3893595
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83171}
Instead of having e.g. `string.new_wtf8` that takes an immediate
specifying the particular UTF-8 flavor to parse, make one instruction
per flavor.
See https://github.com/WebAssembly/stringref/pull/46.
Bug: v8:12868
Change-Id: I2e9f2735c557b2352b6e75314037e473710d87a9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3892695
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Andy Wingo <wingo@igalia.com>
Cr-Commit-Position: refs/heads/main@{#83170}
This also allows allocation folding to be tested in cctests.
Bug: v8:13070
Change-Id: I7b6991461dd7ad4423539b33f59a05d6b247c3e7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3891257
Auto-Submit: Teo Dutu <teodutu@google.com>
Commit-Queue: Teo Dutu <teodutu@google.com>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83169}
GetIterator on object o consists of two steps:
1) iter = load o[#Symbol.Iterator]
2) call iter
For null / undefined step (1) throws an exception, meaning
step (2) is never reached. Up to this change, turbofan
deopts if for either of the two steps there isn't enough
feedback, meaning that we have a deopt loop for null and
undefined.
Change-Id: Ie0eaf8e231a149313e10af9e95fd80bc77dc0beb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3890980
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Auto-Submit: Matthias Liedtke <mliedtke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83159}
FillCurrentPage assumed that everything after top is empty, which
doesn't work with MinorMC and sweeping. Revise FillCurrentPage based
SimulateFullSpace for MinorMC.
I similar implementation is provided both in unittests and cctest.
Migrating affected cctest to unittests is left a future work.
Bug: v8:12612
Change-Id: Ie29be2fc7aaee25e1fd5f66b1c0959c2a45f007f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3885888
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83158}
The normative change in
https://github.com/tc39/proposal-resizablearraybuffer/pull/93 changed
the behavior of TypedArray.prototype.subarray(begin, end) such that if
the receiver is a length-tracking TA and end is undefined, the result
TypedArray is also length-tracking.
This change reached consensus in the March 2022 TC39.
Bug: v8:11111
Change-Id: If1a84cc3134f3ce8046196d6cc36683b6996dec0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3888382
Commit-Queue: Marja Hölttä <marja@chromium.org>
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83147}
