... with zero cost.

Bug: v8:9357
Change-Id: I66985c3fd3e7b4efa354eb564c641562cf55ab49
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3518909Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79632}

This reverts commit 2ee36e4c.

Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64%20UBSan/20570/overview

Original change's description:
> [maglev] Remove input_count from Node constructors
>
> Change the NodeBase bitfield to be out-of-line, and initialised by
> NodeBase::Allocate. This means that we don't have to thread the
> input_count through the Derived constructor just to pass it back into
> the NodeBase constructor, and so we can remove those arguments (plus the
> opcode ones while we're at it).
>
> Bug: v8:7700
> Change-Id: I0c96db8cdd05ef106b3cfeb31c5e0d4770d13cc9
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3553103
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79627}

Bug: v8:7700
Change-Id: Ice38908e85f2980dbbe66c61fab17326b3d0be41
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3553005
Owners-Override: Tobias Tebbi <tebbi@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79631}

This patch enables PAC and BTI for runtime generated code when PAC
is enabled. Additional BTI landing pads will resolve to NOOP when
running on non BTI device and will not cause functional problems.

Change-Id: I3993481df2c3c47e3e81bfb76a8c355f642cd572
Bug: chromium:919548, v8:10026
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548457Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Andre Kempe <andre.kempe@arm.com>
Cr-Commit-Position: refs/heads/main@{#79630}

This reverts commit f124b28d.

Reason for revert: https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket/8818719400214419665/+/u/Check_-_stress_concurrent_allocation__flakes_/flush-baseline-code

Original change's description:
> [heap] Only start incremental marking when V8 is not in GC VM state.
>
> Bug: v8:12503
> Change-Id: Icda291d9770c46c7fee3c70dd4df97f320b1956a
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3398113
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Commit-Queue: Hannes Payer <hpayer@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79623}

Bug: v8:12503
Change-Id: I067b308cfc4511d89144d2bb65a1dba24db62179
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3553104
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Owners-Override: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79629}

Implement WrappedFunction properties name/length.

Bug: v8:11989
Change-Id: I050af5814537552ef6c2077802ffc726f2e08fa3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3507201Reviewed-by: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Chengzhong Wu <legendecas@gmail.com>
Cr-Commit-Position: refs/heads/main@{#79628}

Change the NodeBase bitfield to be out-of-line, and initialised by
NodeBase::Allocate. This means that we don't have to thread the
input_count through the Derived constructor just to pass it back into
the NodeBase constructor, and so we can remove those arguments (plus the
opcode ones while we're at it).

Bug: v8:7700
Change-Id: I0c96db8cdd05ef106b3cfeb31c5e0d4770d13cc9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3553103Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79627}

This reverts commit 6819f75d.

Reason for revert: https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket/8818719400214419665/+/u/Check_-_minor_mc/loop-unrolling

Original change's description:
> Reland "Reland "[baseline] Enable concurrent sparkplug""
>
> This reverts commit 5d6a16fb.
>
> Reason for revert: it was a flake
>
> Original change's description:
> > Revert "Reland "[baseline] Enable concurrent sparkplug""
> >
> > This reverts commit fee91f9a.
> >
> > Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Mac64/44699/overview
> >
> > Original change's description:
> > > Reland "[baseline] Enable concurrent sparkplug"
> > >
> > > Issue that cause the revert was fixed: v8:12713
> > > https://bugs.chromium.org/p/v8/issues/detail?id=12713
> > >
> > > This is a reland of commit f01a6098
> > >
> > > Original change's description:
> > > > [baseline] Enable concurrent sparkplug
> > > >
> > > > Bug: v8:12054
> > > > Change-Id: I1b0ee1a9541a75412b882b259e421aa6e88317da
> > > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3259658
> > > > Auto-Submit: Victor Gomes <victorgomes@chromium.org>
> > > > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > > > Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> > > > Cr-Commit-Position: refs/heads/main@{#79485}
> > >
> > > Bug: v8:12054
> > > Change-Id: Iafba22e3fa3b38eddb226db6cd5afdb7e3e6b435
> > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3528992
> > > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > > Commit-Queue: Victor Gomes <victorgomes@chromium.org>
> > > Cr-Commit-Position: refs/heads/main@{#79618}
> >
> > Bug: v8:12054
> > Change-Id: I3ba60433fdbb5617900c83d022e4dd6f830695f9
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3550271
> > Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
> > Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> > Owners-Override: Tobias Tebbi <tebbi@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@{#79619}
>
> Bug: v8:12054
> Change-Id: Ia0fe1df00f5e715ceda46fbcdc48aed0f0190362
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3550272
> Owners-Override: Tobias Tebbi <tebbi@chromium.org>
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> Reviewed-by: Victor Gomes <victorgomes@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79622}

Bug: v8:12054
Change-Id: I5e75f0467d5617bb6e81d7d0031f298c09194685
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3553107
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Tobias Tebbi <tebbi@google.com>
Owners-Override: Tobias Tebbi <tebbi@google.com>
Cr-Commit-Position: refs/heads/main@{#79626}

Stores to undeclared global in strict mode should throw ReferenceError.

Bug: chromium:1309225
Change-Id: Iac7c55da2ff9c16e488b4fc66408c5300469873e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3553099
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79625}

This is a reland of commit 1289704a

Mac-arm64 problem fixed by:
https://crrev.com/c/3550199

Original change's description:
> [tools] Clean up py2 code
>
> Bug: chromium:1292013
> Change-Id: Ic2c3a197005a2136bb0eda4cbb36d8eb57f42a7c
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3523047
> Reviewed-by: Liviu Rau <liviurau@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79507}

Bug: chromium:1292013
Change-Id: Iadf0ccf94c82012088b76a866296c8e008dff02f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3550274Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79624}

Bug: v8:12503
Change-Id: Icda291d9770c46c7fee3c70dd4df97f320b1956a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3398113Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79623}

This reverts commit 5d6a16fb.

Reason for revert: it was a flake

Original change's description:
> Revert "Reland "[baseline] Enable concurrent sparkplug""
>
> This reverts commit fee91f9a.
>
> Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Mac64/44699/overview
>
> Original change's description:
> > Reland "[baseline] Enable concurrent sparkplug"
> >
> > Issue that cause the revert was fixed: v8:12713
> > https://bugs.chromium.org/p/v8/issues/detail?id=12713
> >
> > This is a reland of commit f01a6098
> >
> > Original change's description:
> > > [baseline] Enable concurrent sparkplug
> > >
> > > Bug: v8:12054
> > > Change-Id: I1b0ee1a9541a75412b882b259e421aa6e88317da
> > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3259658
> > > Auto-Submit: Victor Gomes <victorgomes@chromium.org>
> > > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > > Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> > > Cr-Commit-Position: refs/heads/main@{#79485}
> >
> > Bug: v8:12054
> > Change-Id: Iafba22e3fa3b38eddb226db6cd5afdb7e3e6b435
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3528992
> > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > Commit-Queue: Victor Gomes <victorgomes@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#79618}
>
> Bug: v8:12054
> Change-Id: I3ba60433fdbb5617900c83d022e4dd6f830695f9
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3550271
> Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> Owners-Override: Tobias Tebbi <tebbi@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@{#79619}

Bug: v8:12054
Change-Id: Ia0fe1df00f5e715ceda46fbcdc48aed0f0190362
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3550272
Owners-Override: Tobias Tebbi <tebbi@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79622}

We could optimize String#startsWith in JSCallReducer for
three conditions:
- If search_element is definitely not a string, we make no change.
- If search_element is definitely a string and its length is less
or equal than max inline matching sequence threshold, we could
inline the entire matching sequence.
- Else we try to inline, and have a runtime deopt if search_element
is not a string.

Bug: v8:8400
Change-Id: I505090b91d35fbc2c91cdf985717c68135cba807
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3517936Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79621}

Bug: chromium:1029379
Change-Id: Ia1de91ab0ffc63912ce26349d095881a7a141ff8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3550269Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79620}

This reverts commit fee91f9a.

Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Mac64/44699/overview

Original change's description:
> Reland "[baseline] Enable concurrent sparkplug"
>
> Issue that cause the revert was fixed: v8:12713
> https://bugs.chromium.org/p/v8/issues/detail?id=12713
>
> This is a reland of commit f01a6098
>
> Original change's description:
> > [baseline] Enable concurrent sparkplug
> >
> > Bug: v8:12054
> > Change-Id: I1b0ee1a9541a75412b882b259e421aa6e88317da
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3259658
> > Auto-Submit: Victor Gomes <victorgomes@chromium.org>
> > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#79485}
>
> Bug: v8:12054
> Change-Id: Iafba22e3fa3b38eddb226db6cd5afdb7e3e6b435
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3528992
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Victor Gomes <victorgomes@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79618}

Bug: v8:12054
Change-Id: I3ba60433fdbb5617900c83d022e4dd6f830695f9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3550271
Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Owners-Override: Tobias Tebbi <tebbi@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@{#79619}

Issue that cause the revert was fixed: v8:12713
https://bugs.chromium.org/p/v8/issues/detail?id=12713

This is a reland of commit f01a6098

Original change's description:
> [baseline] Enable concurrent sparkplug
>
> Bug: v8:12054
> Change-Id: I1b0ee1a9541a75412b882b259e421aa6e88317da
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3259658
> Auto-Submit: Victor Gomes <victorgomes@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79485}

Bug: v8:12054
Change-Id: Iafba22e3fa3b38eddb226db6cd5afdb7e3e6b435
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3528992Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79618}

Change-Id: Iac021f8666058042f5c26cf07d0f3810a1d451fc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3528374
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Reviewed-by: ji qiu <qiuji@iscas.ac.cn>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Yahan Lu <yahan@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#79617}

This fixes the following compiler warning:

```
src/compiler/backend/mid-tier-register-allocator.cc:2046:26: warning: loop variable 'succ' of type 'const
      v8::internal::compiler::RpoNumber' creates a copy from type 'const v8::internal::compiler::RpoNumber'
      [-Wrange-loop-analysis]
    for (const RpoNumber succ : block->successors()) {
                         ^
src/compiler/backend/mid-tier-register-allocator.cc:2046:10: note: use reference type 'const
      v8::internal::compiler::RpoNumber &' to prevent copying
    for (const RpoNumber succ : block->successors()) {
         ^~~~~~~~~~~~~~~~~~~~~~
                         &
```
Signed-off-by: Darshan Sen <raisinten@gmail.com>
Change-Id: I41a9b6aa1ee16bf140f326410ae864b425509c2d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3538285Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79616}

Bug: v8:1306483
Change-Id: I2f1baf1374e82418c117f9126db2388b84ef46ef
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3530110Reviewed-by: Almothana Athamneh <almuthanna@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79615}

They make assumptions which don't hold for API handlers.

Bug: v8:9237,chromium:1308360
Change-Id: I9f122c4e75a24d83ef3653cbf7a223ed522e4d13
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548899Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79614}

Bug: chromium:1309225
Change-Id: Ifd62639a2aa18b633e7cf36632677ee16c977afd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548458Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79613}

P10 comes with prefixed instruction (2 x 4-byte instructions)
which allow for using larger immediate values. `paddi` has
been added in this CL which uses a 34-bit immediate.

Prefixed instructions cannot cross 64-byte boundaries, i.e we cannot
have the first 4-bytes on one side and the second 4-bytes emitted on
the other side of the boundary. Therefore we need to align generated
code to 64 bytes and emit a nop whenever the boundary is being crossed
midway (check emit_prefix).

Change-Id: I90e9953089214e15eeef0d70147ea5943fe05f45
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3528993Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79612}

Commit 0719ace6 improves the code
generated for comparisons by avoiding the materalization of the
comparison bit.

Now, this commit aims at doing this same improvement for binary
operations. Since binary operations set the ZF flag, there is no
reason to insert a "== 0" comparison.

Note that this commit might increase register pressure, which might
actually reduce performance. It's hard to anticipate, so we'll land
it, and revert it if it's actually bad for performance.


Bug: v8:12484
Change-Id: I963f0c4afdd59b35b4bac468e47d987836433163
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545165Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Darius Mercadier <dmercadier@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79611}

Add a test for the case where SlicedStrings of ThinStrings are looked up
in the string table, testing the path that the original string's length
differs from the actual string's length.

Bug: chromium:1309767
Change-Id: I909c64397bf28ec33c3324d94882fbfe81ac4109
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3549837Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79610}

Maglev compilation can currently fail, e.g with unsupported bytecodes.

Bug: v8:7700
Change-Id: I837d69a5f9c27d4dc6fa9d03369f045fb5175d61
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3541921Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79609}

Bug: chromium:1309769, v8:12619
Change-Id: I880c7326f2ec91f1aa985d6b7ed67f8f5afc074b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548897
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79608}

Change Checkpoints from IR Nodes to just normal Zone objects, pointed to
by the deopting Node. Also merge Checkpoint and DeoptimizationInfo --
this has the side effect that multiple Nodes that share a checkpoint
will point to the exact same deopt call.

Bug: v8:7700
Change-Id: Ib36aa13afe3af6a0a22d2cfe80a13fef4bea1227
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545179
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79607}

Currently, OSB can not be safely accessed if sweeping is in progress.
This can, however, be easily lifted with atomic stores.

Having the consistent bitmap is needed for the generational barrier for
source objects (to retrieve the source object beginning).

Bug: chromium:1029379
Change-Id: I5fb8db579f881ddf240ce68ad51fa8264ee645dc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545071Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79606}

It's hitting unimplemented code paths.

Bug: v8:11111, v8:12731
Change-Id: Icbffced6cbe207426363daa5f3b9ff5677b58b6c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548816Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79605}

This reverts commit 9c3d4b35.

Reason for revert: This is not the right fix (see bug).

Original change's description:
> [super IC] Fix receiver vs lookup start object confusion
>
> Bug: v8:9237,chromium:1308360
> Change-Id: I11e3c14a6cecb9d88a834711fb6252191494d5f7
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545172
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Commit-Queue: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79571}

Bug: v8:9237,chromium:1308360
Change-Id: I0efa6ab561482ffc323b63500acfeb80598f3e7c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548896
Auto-Submit: Marja Hölttä <marja@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79604}

- When the property being defined with DefineKeyedOwnIC or
  DefineNamedOwnIC already exists, we should use the slow path to
  check if the operation is allowed in case the property is
  non-configurable or Object.preventExtensions() has been called on
  the property.
- Since KeyedStoreIC:Store() reuses StoreIC::Store() when the key is a
  name, we should use Runtime::DefineObjectOwnProperty() for
  DefineKeyedOwnIC too.
- When dealing with public fields, Runtime::DefineObjectOwnProperty()
  should use JSReceiver::CreateDataProperty() instead of
  Object::SetProperty() for the specified semantics. This patch also
  adds JSReceiver::AddPrivateField() for it and StoreIC::Store to
  define private fields without triggering traps or checking
  extensibility.
- To emit a more specific error message when redefining properties
  on non-extensible objects, Object::AddDataProperty() now also takes
  a EnforceDefineSemantics enum to distinguish between set and define.
- Drive-by: fix JSReceiver::CheckIfCanDefine() which should check for
  extensibility even if the configurability check passes.

Bug: chromium:1259950, v8:9888
Change-Id: Ib1bc851ffd4b9c3a0e98cac96dafe743c08ee37e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3517934Reviewed-by: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Cr-Commit-Position: refs/heads/main@{#79603}

Remove StoreToFrame and the general diff encoding for checkpoints, and
instead make all Checkpoints immediately copy the live part of the
interpreter frame state.

This means that we don't need to recreate the frame state during graph
processing, and we don't have to copy the checkpoint's state for storing
in the deferred DeoptimizationInfo.

In theory the diff encoding was meant to save zone memory for unused
checkpoints, and for checkpoints that don't differ much from each other.
However,

  a) We expect to do most checkpoint elimination during graph building,
     so the assumption that many checkpoints will be unused seems less
     probable, and

  b) We need to copy the checkpoint's frame state for emitting deopts,
     so we don't actually end up avoiding doing the copies.

So, we can simplify things by removing this complexity.

Bug: v8:7700
Change-Id: Iff9743fabbf7a017cccf0ece76a797c571764ea6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545178Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79602}

This is a reland of commit d9e1f2ae

Change: disable regression test on non-SIMD hardware

Original change's description:
> [wasm][liftoff] Spill regs for multi-value merges
>
> If there is more than one value in the merge region, a stack-to-stack
> move can overwrite the source of a stack-to-register move. To avoid
> this, spill all registers.
>
> R=clemensb@chromium.org
>
> Bug: chromium:1299183
> Change-Id: I10495434d0a18c9072ee3882e00a687edd8c592a
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3523044
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79584}

Bug: chromium:1299183
Change-Id: I6f2af786ab91194a93945f5030575d1b8abee7fd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548716Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79601}

Rather than emitting eager deopt code inline, use the full
DeoptimizationData+TranslationArray mechanism in maglev, for consistency
with TurboFan and simplification of implementing lazy deopts in the
future.

Bug: v8:7700
Change-Id: I67282b27493772c78ad28feaa4ad6a2c35c8e239
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545169Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79600}

This reverts commit 802c7b3e.

Reason for revert: Cluserfuzz found a reason to have this.

Original change's description:
> [string] DCHECK instead of test that ThinString's actuals have same length
>
> ThinStrings always forward to internalized strings that have the same
> character contents and thus the same length.
>
> Change-Id: I5929d266f96b23029f4786baf993a431cf4ad38d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3541522
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79582}

Change-Id: Ib8a7b962242f8b8ab3ffc5c70ed1c84d187e5b8e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548459
Auto-Submit: Leszek Swirski <leszeks@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@{#79599}

In LowerStringCodePointAt, rather than call StringCodePointAt
builtin, we could inline it using StringCharCodeAt.

Bug: v8:11743
Change-Id: I924f4180ffcfd583cfcbba57b2e0cf114adef068
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3517935Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79598}

This reverts part of crrev.com/c/2413252 since std::unique_ptr does
not satisfy is_standard_layout; and is_standard_layout is needed
to use offsetof:

 error: offset of on non-standard-layout type [-Werror,-Winvalid-offsetof]

Fixed: v8:12721
Change-Id: Ifbb1235fc3b8d1d855d41a226117fed88c506078
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3540141Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79597}

Report fine-grain incremental mark/sweep statistics to the Recorder API.
These will be used by Blink to populate UMA histograms such as
V8.GC.Event.MainThread.Full.Incremental.(Mark|Sweep).

Bug: chromium:1154636
Change-Id: I1cbdcb2ffa49bd01d04a2e1d43921cebf956ac84
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545070Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Nikolaos Papaspyrou <nikolaos@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79596}

Bug: chromium:1029379
Change-Id: I74aeaa27c27ed33c169eee74b3a8c22adedb04eb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545320
Auto-Submit: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79595}

The debugger maintains a stack of promises used for catch prediction
with promise builtins and async functions. Previously this stack would
hold on to the individual promises strongly, and subtle bugs that lead
to not properly cleaning up the stack in some corner cases would often
lead to significant memory issues (e.g. leaking whole iframes).

This refactors the PromiseOnStack to be

  (a) on the V8 heap, rather than allocating C++ structs with global
      handles pointing to the promises, and
  (b) hold on to the promises only weakly.

While this will not guarantee proper promise stack management, it will
at least ensure that edge cases don't lead to catastrophic (debugger
only) leaks.

Bug: chromium:1292063
Change-Id: I9c293ca2032de3a59e1e9624f132d37187805567
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545176
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79594}

Before productionizing this, we probably want to just ignore the whole
section if it contains invalid data, but for now failing with a decode
error is more consistent with existing checks.

R=ecmziegler@chromium.org

Bug: v8:12537
Change-Id: I7fc5933573a4d6eddd039bf51361c5bee5c5170d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3545177Reviewed-by: Emanuel Ziegler <ecmziegler@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79593}