Follow-up to post-submit comments in
https://chromium-review.googlesource.com/c/v8/v8/+/3782796

Bug: chromium:1346250, v8:12926
Change-Id: I09a8601c600b24fbc92489224ad69602e557bf7f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3784604
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82154}

This is a reland of commit 7af609f9

Original change's description:
> [loong64][mips64][wasm] WasmCompileLazyFrame scanning
>
> Port commit eb3fb6cb

Change-Id: I9d48e02cf4d5710c6c36efb1c82c584755867b9f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3805838Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Auto-Submit: Liu Yu <liuyu@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/main@{#82153}

On-heap objects may have TracedReferences, which are uncompressed
pointers that still need to be conservatively scanned (another CL).

Bug: chromium:1325007
Change-Id: If05add36191978486f315dc1ef142a7ed8d4a7bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804808
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Auto-Submit: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82152}

Port 4e329f8c

Original Commit Message:

    The original CL did not handle the case where a GC gets triggered by
    the allocation of the error object when compilation fails.

    Orignal message:

    Feedback vector allocation can trigger a GC, and thereby make the
    WasmCompileLazyFrame visible for the GC. This CL add stack scanning
    for the WasmCompileLazyFrame.

    Design doc: http://doc/1peovM6N6C4nSEdC77l4uxU1L0njA0RTaOjy5F12r2CQ

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

Change-Id: I3cdd5b0cd72463a6b492fcafcabcf65e1da55eea
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804694Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#82151}

Bug: v8:12918
Change-Id: Id3419cf7cef833cc8e18948874c40e13a3f20675
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3798522
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82150}

Bug: v8:10391
Change-Id: I7f1b69b1fe41507e4eb72a35b4c143a970cc2f74
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/+/3788205
Commit-Queue: Samuel Groß <saelo@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82149}

Bug: v8:7700
Change-Id: I27db2c8d0cbbf4324d9f2b214b909326fc61968d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3805065
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82148}

Bug: v8:12612
Change-Id: Iaf967da524413b6701aa93fa471d79e2a82e43e2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3805064Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82147}

Change-Id: I43e4a4cadc60e958d6c9d80e725a49a3e36d8ba9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3797832Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#82146}

Bug: v8:7700
Change-Id: I36018a3323d778b8657087736e1bff70b0fdbf2d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3779920
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82145}

Port 044a18ac

Original Commit Message:

    The {LiftoffAssembler::Load} method already receives an {i64_offset}
    parameter which skips the UXTW (zero extension of 32-bit addresses) in
    the memory operand. The same needs to happen on stores.

    On 32-bit platforms, we cannot have addresses >=4GB anyway (they would
    be detected as OOB before reaching the point in question), so this is
    not a problem. On x64, all 32-bit registers are zero-extended already
    (which is debug-checked in the generated code), so this is also no
    problem (and we just ignore the additional parameter).

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

Change-Id: Ic531618875bf3b6abcf3741bcbe153e603d9f250
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3794647Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#82144}

Bug: chromium:1348929
Change-Id: I14ce163dbebd7e83023286e210411e8a8208e238
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804603
Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82143}

Port commit ec6368bf

Bug: v8:11325
Change-Id: I3805ec4886dc2cb109fa450c0141d5e3f0779292
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3803673Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Auto-Submit: Liu Yu <liuyu@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/main@{#82142}

This also creates a generic CallBuiltin node.

Bug: v8:7700
Change-Id: I7c7a4f8205fc6847372e880ad21658b825ab9bce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3798723
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82141}

Bug: v8:9407
Change-Id: Iab0a4ca8dd5d83444d1addd6043a5c8e3a8577a7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3773773Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82140}

This reverts commit 6735d74a (relands cd617a58) and fixes the SIMD issue.

Change-Id: I86894f2d4fbdb7ba85aae3730f90ab2b11c088bc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3793709
Auto-Submit: Matthias Liedtke <mliedtke@chromium.org>
Commit-Queue: Matthias Liedtke <mliedtke@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82139}

The original CL did not handle the case where a GC gets triggered by
the allocation of the error object when compilation fails.

Orignal message:

Feedback vector allocation can trigger a GC, and thereby make the
WasmCompileLazyFrame visible for the GC. This CL add stack scanning
for the WasmCompileLazyFrame.

Design doc: http://doc/1peovM6N6C4nSEdC77l4uxU1L0njA0RTaOjy5F12r2CQ

Change-Id: I9be66c696e27f9ecf8228daf40ad6258f0e963d1

Bug: v8:12852
Fix: v8:13133
Change-Id: I9be66c696e27f9ecf8228daf40ad6258f0e963d1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804599Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82138}

This reverts commit a1392fa1.

Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/43149/overview

Original change's description:
> Enable background merging when --stress-background-compile
>
> This change adds new functions to BackgroundCompileTask which closely
> match those in BackgroundDeserializeTask. These functions allow a caller
> to manage background merging of newly compiled content into an existing
> Script from the Isolate compilation cache. These functions are not yet
> exposed via the API; instead, StressBackgroundCompileThread uses them to
> increase test coverage of the merging logic.
>
> Bug: v8:12808
> Change-Id: I4d2f429164223785169fe447ce2bdd8beaee00d4
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3793959
> Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82121}

Bug: v8:12808
Change-Id: Ibb0bc2adb79e4655b39a8a6ac33d8c8ffc5ebdb9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804602
Owners-Override: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#82137}

This reverts commit 872b7faa.

Reason for revert: Somewhat speculative revert because of https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux%20-%20gc%20stress/39673/overview (reverting locally resolved the issue for me)

Original change's description:
> Fix Context PromiseHook behaviour with debugger enabled
>
> This is a solution for https://github.com/nodejs/node/issues/43148.
>
> Due to differences in behaviour between code with and without the debugger enabled, some promise lifecycle events were being missed and some extra ones were being added. This change resolves this and verifies the event sequence is consistent between code with and without the debugger.
>
> Change-Id: I3dabf1dceb14233226b1752083d659f1c2f97966
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3779922
> Reviewed-by: Victor Gomes <victorgomes@chromium.org>
> Commit-Queue: Camillo Bruni <cbruni@chromium.org>
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82132}

Change-Id: I3e05adead5d8033906055e0741854da68aade2ac
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804859
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Owners-Override: Nico Hartmann <nicohartmann@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82136}

This reverts commit 7af609f9.

Original change's description:
> [loong64][mips64][wasm] WasmCompileLazyFrame scanning
>
> Port commit eb3fb6cb
>
> Change-Id: Ic2c87341458b7867fea2d5b8cea56315ac727477
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3803996
> Auto-Submit: Liu Yu <liuyu@loongson.cn>
> Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
> Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
> Cr-Commit-Position: refs/heads/main@{#82126}

Change-Id: I81a0b0a6d6bb4409c4f763e0dca64979dee8e19b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3803672
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Liu Yu <liuyu@loongson.cn>
Cr-Commit-Position: refs/heads/main@{#82135}

In TierDown mode, all functions have to be compiled with Liftoff, even
if lazy compilation is enabled.

R=clemensb@chromium.org

Bug: v8:12852
Change-Id: If450563a6768f82439c77ef7c21ecef8e2b25475
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804255Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82134}

Add flag contradictions for "assert-types" flag and a README file for how
to add trials from the source side. Also restore "assert-types" and its
contradictions' probability since we can avoid contradictions now.

Bug: v8:1340816,v8:1336577
No-Try: true
Change-Id: I2a3af2d13cd2f9f542bec5c013c50bf26ff93cc1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3787878
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82133}

This is a solution for https://github.com/nodejs/node/issues/43148.

Due to differences in behaviour between code with and without the debugger enabled, some promise lifecycle events were being missed and some extra ones were being added. This change resolves this and verifies the event sequence is consistent between code with and without the debugger.

Change-Id: I3dabf1dceb14233226b1752083d659f1c2f97966
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3779922Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82132}

Previously we've added has_scheduled_exception DCHECKs that were a bit
too strict in some cases.

- Remove unused exception_out param for TryRunMicrotasks
- Simplify overzealous DCHECK and clean up MicrotaskQueue::RunMicrotasks

Change-Id: I3a945a731573b6b3e44e17487fb8bf871b9a6793
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3789504
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82131}

This reverts commit eb3fb6cb.

Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Mac64%20GC%20Stress/23845/overview

Original change's description:
> [wasm] WasmCompileLazyFrame scanning
>
> Feedback vector allocation can trigger a GC, and thereby make the
> WasmCompileLazyFrame visible for the GC. This CL add stack scanning
> for the WasmCompileLazyFrame.
>
> Design doc: http://doc/1peovM6N6C4nSEdC77l4uxU1L0njA0RTaOjy5F12r2CQ
>
> Change-Id: Iec16f50ad2c8ad7e6dcf05f9e620163d3b60ea0a
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3789516
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Andreas Haas <ahaas@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82119}

Change-Id: I694cd288d3a299bd397d4417e6864f7075a7c181
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804256
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Owners-Override: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82130}

Bug: v8:12852
Change-Id: I4f38a41afe07633060038151acee986f318103b5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3795376Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82129}

Bug: v8:7700
Change-Id: If911ff32d42c7c907da88d52192bb839bf459d5b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3803028
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82128}

This reverts commit 61193620.

Reason for revert: Blocking roll: https://chromium-review.googlesource.com/c/chromium/src/+/3802992/

Original change's description:
> [heap, api] Check assumptions for embedder fields on set
>
> Previously, we would set embedder fields and do type checks (on
> embedder fields) in the GC. This does not work nicely as embedder
> fields contain system pointers whereas we can only operate with
> tag-aligned reads/writes. The end result of assembling pointers was
> somtimes broken for concurrent marking.
>
> In this CL we reverse the mode and check assumptions when writing the
> fields. From Blink we generally only write once and use the fields in
> the GC and via reads multiple times.
>
> We assume, that when running with CppHeap, any pointer on an instance
> field that points into CppHeap, also has the type field set with the
> appropriate tracing information. In debug builds we also verify that
> the embedder field indeed points to the start of an Oilpan object.
>
> Bug: chromium:1337690
> Change-Id: I9f9a8e691cdcf666861a455dcf8f65f2fe80b034
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3788206
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Reviewed-by: Omer Katz <omerkatz@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82120}

Bug: chromium:1337690
Change-Id: Iaece8f51883c7d001fb18ef48faaf271c48b8f11
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804245
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Owners-Override: Leszek Swirski <leszeks@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#82127}

Port commit eb3fb6cb

Change-Id: Ic2c87341458b7867fea2d5b8cea56315ac727477
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3803996
Auto-Submit: Liu Yu <liuyu@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/main@{#82126}

Preparation step to remove the subtype relationship between funcref and anyref.

Bug: v8:7748
Change-Id: Ie4b29bfc4b874aaca668082018f5359d1b6e3a2e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3803226Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Matthias Liedtke <mliedtke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82125}

This is a strictly code moving change. We move the diffing algorithm
out of liveedit.cc into its own file.

We want to replace the current diffing algorithm and to stay safe we
will ship old and new algorithm side-by-side for a release for easy
revertability. Given that liveedit.cc is already large enough we
extract the diffing algo into a separate file.

R=kimanh@chromium.org

Bug: chromium:1205288
Change-Id: If5ebb6c2dff2f00387c9e2ab87e4bb61d1f1484a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3802687Reviewed-by: Kim-Anh Tran <kimanh@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82124}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/4bfce1a..b1d3dce

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/src/buildtools/+log/6940fd4..56cc5bc

Rolling v8/third_party/zlib: https://chromium.googlesource.com/chromium/src/third_party/zlib/+log/c4e1268..8d1d3e3

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

Change-Id: I2800a7fab761b9bdfa08faf777d62311dfaa1f93
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804026
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
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We record Sparkplug compiled into SFI which will be saved in disk cache, once deserializes SFI from disk cache, and the SFI was Sparkplug compiled, we trigger concurrent batch Sparkplug compilation, and directly allocate feedback vector on the first call.
This CL can improve Speedometer2 by +2%.

Change-Id: I89b0ffc6d7a107a1b8c131529e02cd7eb2890888
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3725612Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Tao Pan <tao.pan@intel.com>
Cr-Commit-Position: refs/heads/main@{#82122}

This change adds new functions to BackgroundCompileTask which closely
match those in BackgroundDeserializeTask. These functions allow a caller
to manage background merging of newly compiled content into an existing
Script from the Isolate compilation cache. These functions are not yet
exposed via the API; instead, StressBackgroundCompileThread uses them to
increase test coverage of the merging logic.

Bug: v8:12808
Change-Id: I4d2f429164223785169fe447ce2bdd8beaee00d4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3793959
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82121}

Previously, we would set embedder fields and do type checks (on
embedder fields) in the GC. This does not work nicely as embedder
fields contain system pointers whereas we can only operate with
tag-aligned reads/writes. The end result of assembling pointers was
somtimes broken for concurrent marking.

In this CL we reverse the mode and check assumptions when writing the
fields. From Blink we generally only write once and use the fields in
the GC and via reads multiple times.

We assume, that when running with CppHeap, any pointer on an instance
field that points into CppHeap, also has the type field set with the
appropriate tracing information. In debug builds we also verify that
the embedder field indeed points to the start of an Oilpan object.

Bug: chromium:1337690
Change-Id: I9f9a8e691cdcf666861a455dcf8f65f2fe80b034
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3788206
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82120}

Feedback vector allocation can trigger a GC, and thereby make the
WasmCompileLazyFrame visible for the GC. This CL add stack scanning
for the WasmCompileLazyFrame.

Design doc: http://doc/1peovM6N6C4nSEdC77l4uxU1L0njA0RTaOjy5F12r2CQ

Change-Id: Iec16f50ad2c8ad7e6dcf05f9e620163d3b60ea0a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3789516Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82119}

R=jkummerow@chromium.org

Bug: v8:12926
Change-Id: I5942af918142a72158149e9820f49d4f07bb5266
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3790860Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82118}

As requested in https://chromium-review.googlesource.com/c/v8/v8/+/3794708

No intended behavior change.

Bug: none
Change-Id: I5816ecf6073dc3c0d558d52518e38e4dbee7d562
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3796233Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82117}

This CL fixes issues in YoungGenerationConcurrentMarkingVisitor
(YGCMV) that were discovered during an offline integration test which
uses YGCMV during MinorMC's final pause.

This also adds PopOnHold() to EmptyMarkingWorklist, in order to
process on-hold objects during final pause once concurrent marking is
working.

Bug: v8:13012

Change-Id: Ia4fef101bd974de9f5b031974cdae787dcbd3819
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3803030
Commit-Queue: Leon Bettscheider <bettscheider@google.com>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82116}

The type stored in {Result} should not always be the same as derived by
the compiler for the argument to {Decoder::toResult}. If we pass in a
temporary, we most often want it to be stored by value, not by
reference.
This CL enforces this; if requirements change in the future, we can
remove the static assertions and think about how to protect against
accidental UAF when referencing a temporary value.

R=jkummerow@chromium.org
CC=mliedtke@chromium.org

Change-Id: Ia0449e6ed7342319799479b200af35660fccc6d7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3792115Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82115}