Move on-allocation and on-move events to a designated tracker that is
only installed when running with debugging flags. This eliminates a
bunch of flag checks as they are all moved behind the allocation
trackers.

Bug: v8:12615
Change-Id: Ied6819991511328351825e2341375c36ae34916b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3450419Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79014}

R=machenbach@chromium.org,liviurau@chromium.org,alexschulze@chromium.org

Bug: v8:12610
Change-Id: I24a1af48bf7a748e06c719439fb368ad75dd0160
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3448377
Auto-Submit: Tamer Tas <tmrts@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79013}

Bug: v8:11880, chromium:1292638
Change-Id: Ia457f391098aa2027988dae404948ab6f7fa8fab
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3450415
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79012}

Bug: v8:11510
Change-Id: I15d3758532d964ce6a7203c4152ba3e34c3d9601
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3448375Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79011}

This is required when allocating external pointer table entries from
background threads through the LocalFactory interface.

Bug: v8:10391
Change-Id: Ice5eee1000e1c7341bd0e58782cbb175080a5a74
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/+/3448376Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79010}

We need to properly handle the case of uninitialized embedder data slots
which contain the "undefined" value and thus might look like valid
external pointer table indices.

Bug: v8:10391
Change-Id: I169a3e42132dde223ea151c1a5d5956c72341f8d
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/+/3448378Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79009}

Bug: v8:12605
Change-Id: Ic353570757b0271279d9a00352017b0341281e05
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3448382Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79008}

Another encoding fix and test coverage for it.

No-Try: true
Bug: chromium:1292013
Change-Id: Id54f505848f93b4869710156fa77ad2e258c5dd6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3447905Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79007}

When iterating slots for promoted objects we now also need to visit
the map word slot since maps might get compacted. If we do not do this,
we risk losing the already recorded slot for the map word in case that
object already got marked.

Bug: v8:12578, chromium:1295239
Change-Id: I34fbf7ae4b9e36eae8e7e3df354b5fd19adcb08f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3448373Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79006}

Drive-by: Change the macro magic around elements kind runtime predicates
to make the function names grep-able.

Fixed: v8:10105
Change-Id: Id5046bd0e60f40611c6c264613729fb9c6b73853
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3420306Reviewed-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@{#79005}

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/bdea505..d2cbd4b

Avoid potential truncation issues for the integral type parameterized tests. (#1341) (staffantj)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/d2cbd4b

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

Change-Id: I7b50e4d883fe02cf0fcf2ede04d74ef0bab85e6b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3449236
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@{#79004}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/19e2886..a4e7e5a

Rolling v8/buildtools/third_party/libc++abi/trunk: https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxxabi/+log/77c52e2..a18d792

Rolling v8/third_party/android_sdk/public: Ez2NWws2SJYCF6qw2O-mSCqK6424l3ZdSTpppLyVR_cC..PGPmqJtSIQ84If155ba7iTU846h5WJ-bL5d_OoUWEWYC

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/1b93e14..cc0f7a5

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/94a76bd..d7bcddc

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

Change-Id: I4596515689bc1e99feb0af285d5b631fc2be8d5a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3449235
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@{#79003}

Change-Id: Ie5eac61238442bedcb5f9d61a67cc47de261655a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3447692Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79002}

Change-Id: If5f8aef98dcfbff14ba457669c4a5fba5c9226b8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3447376Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79001}

This will allow users to create invalid V8DebuggerIds, e.g. to handle
error cases.

Bug: v8:12528
Change-Id: I6efbea934d444b520fc43531b910f4f80c718630
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3445742Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79000}

- Unroll loop in ReadVarInt to skip checks for uncommon branches and
  improve by ~15%
- Use cage_base more aggressively
- Use more dehandlified code if possible
- Allow allocating strings directly in old-space to avoid filling up the
  new space when deserialising web-snapshots

Cleanup:
- ThrowDataCloneError now returns Nothing<bool>() for more consistency

Bug: v8:11525
Change-Id: I69ac635e2bcab83e92fba5ab34603146fa21f043
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3437049Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78999}

Not all environments (like ShadowRealm) would expect console
APIs to present in their globals. Moving console API to
context's extras binding to allow them to be still
snapshotted to not slow down the bootstrap.

The console API is not removed from the global in this CL,
but it is planned to be removed in the later release.

Bug: v8:11989
Change-Id: Ieca09e0bafdf8943e8fff8fee97fc21c2326320f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3364786Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Chengzhong Wu <legendecas@gmail.com>
Cr-Commit-Position: refs/heads/main@{#78998}

R=liviurau@chromium.org, machenbach@chromium.org

Bug: chromium:1292010
Change-Id: Ice96bda42e1597b7d266cafb61565a54ea96d9a8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3448374Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Alexander Schulze <alexschulze@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78997}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/dfc291f..19e2886

Rolling v8/buildtools/third_party/libunwind/trunk: https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind/+log/f2ef96e..b86911d

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/b4974c8..25f38be

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/9c0ccc7..1b93e14

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

Change-Id: I86966fa9d9a33c714004f9982f01dfa8e83b095a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3447530
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@{#78996}

Since {WasmGraphBuildingInterface::UnOp} always sets the result value
node, we have to ensure the passed {result} is not null.
Note: This can never happen with the current set of operators; this is
guarding against possible future operators.

Bug: chromium:1285041
Change-Id: I657cb02a9c650121a51ee795ef5572a5abd66933
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3447373Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78995}

So that it doesn't cause loops to think that they have side effects,
which would impede load elimination and similar optimizations.
For compiling JavaScript, there is an equivalent annotation
in JSOperatorBuilder::StackCheck.

Change-Id: Ic9380df424062deb565671c8650b46550621fce5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3440662
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78994}

We treat array indices as unsigned, so we should use
`ChangeUint32ToUint64` before using them for computing memory
offsets on 64-bit platforms.
The signed version is currently an inefficiency; if we actually
allowed arrays of such huge sizes, it would become a bug.

Bug: v8:7748
Change-Id: I5c89ef82755a9987c4e5a8c9b3b630534bb3424f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3440661
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78993}

Fixes cross-compilation with bazel-zig-cc.
Signed-off-by: Piotr Sikora <piotrsikora@google.com>
Change-Id: I7d94b84be33d8699ec71b4073bc0df1e7fcce5c4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3445204Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78992}

The regexp parser historically has tried to gracefully detect and bail
out from excess zone allocations, where 'excess' was determined to be
an arbitrary limit of 256MB.

This leads to issues now that the regexp parser may run from within
the JS parser - the JS parser doesn't observe this arbitrary limit and
happily keeps allocating until the underlying allocator actually runs
out of memory; this way, the JS parser can handle very large JS files,
and it's now counterproductive if the regexp parser (which reuses the
JS parser zone) bails out on excess allocations.

This CL simply removes the excess_allocation mechanism.

Bug: chromium:1264014
Change-Id: I8d93a1e52aa65bb0ea6c2aab3b68b479ce79a1f6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3401580Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78991}

Previously the inspector was trying to handle step-out for async
functions by annotating the async stacks, but this was merely a
hack and didn't work reliably

(a) when the async caller that is `await`ing the result of the
    callee was still in the synchronous part (because then there
    was no async task yet in the inspector), or
(b) not at all when the async stack tracking wasn't enabled or the
    maximum async stack depth was too small.

This CL replaces that hack with a pragmatic solution inside the
V8 debugger, where upon `await` we memorize the async function
object of the caller on the outer promise of the callee, and when
stepping out of the callee we check whether the returned promise
has a memorized async function object and if so, we schedule that
to resume.

This CL thereby effectively reverts https://crrev.com/c/1054618
and replaces it with a V8 debug solution, and thereby further
reduces the (memory) overhead of an AsyncStackTrace.

Fixed: chromium:1246867
Bug: v8:6161, v8:7753, chromium:1277451, chromium:1280519
Change-Id: I6aa79e90f49d204f66bfd37e7a328c7fb8d635b1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3439865Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78990}

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/1ee7bee..bdea505

Add mutex when reading counters_ (Fixes #1335) (#1338) (Liqiang TAO)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/bdea505

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

Change-Id: I5acd1ef0af30aac9f76e6f7b215fd51d89c73c75
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3446781
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@{#78989}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/3233ed2..dfc291f

Rolling v8/buildtools/third_party/libc++abi/trunk: https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxxabi/+log/5b0a8cf..77c52e2

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/66c9784..9c0ccc7

Rolling v8/third_party/googletest/src: https://chromium.googlesource.com/external/github.com/google/googletest/+log/14aa11d..43efa0a

Rolling v8/third_party/zlib: https://chromium.googlesource.com/chromium/src/third_party/zlib/+log/fc5cfd7..3fc7923

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/a8ca822..94a76bd

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

Change-Id: Ia89843d90b9b115b302e4281991f3a7b2284b963
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3445842
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@{#78988}

Change-Id: I948d17b34334caae9deb9282176a76e6be3d28a3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3443174Reviewed-by: ji qiu <qiuji@iscas.ac.cn>
Commit-Queue: ji qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#78987}

Bug: chromium:1290612
Change-Id: If1e3030882786ccc0c6a9b42128bc1ac044f43f1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3445201Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78986}

This reverts commit 78bc7852.

Reason for revert: revert due to failure on native tests.

Original change's description:
> s390x: [baseline] enable sparkplug on s390x
>
> Change-Id: I4646bb0f3f6291c97bb4b397d6248b9bdaa2059a
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3439641
> Reviewed-by: Victor Gomes <victorgomes@chromium.org>
> Commit-Queue: Junliang Yan <junyan@redhat.com>
> Cr-Commit-Position: refs/heads/main@{#78959}

Change-Id: I8d006211e42ace4db804f1a88f2749282ef2de32
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3440771
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78985}

Properly push back the current request promise for async generators when
resuming after an `await` to ensure that the catch prediction works as
expected for async generators.

Fixed: chromium:1220203
Change-Id: I8c3592ceb567aadcba8f460794cd5d60a965a360
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3442680
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Philip Pfaffe <pfaffe@chromium.org>
Commit-Queue: Philip Pfaffe <pfaffe@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78984}

Bug: v8:12315
Change-Id: If750c9528d4f20c6695a6b25f4d1abc8a14dba62
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3431486
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78983}

all_ones and all_zero is also moved to the macro assembler
which will be used later.

Change-Id: I72787c9bb217dd78f6fd8a818b95939e936bc68d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3439916Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#78982}

After https://crrev.com/c/3416191 there are too many mixed concerns in
the clusterfuzz directory. We split it into js-fuzzer, foozzie and
trials.

Change-Id: I9a21ee83985e6113d77acba4583e99df88723c60
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3443505
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Almothana Athamneh <almuthanna@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78981}

Currently, the stack-switching import wrapper always suspends. Only
suspend if the returned value is a promise, otherwise just convert and
return the value back to wasm.

R=ahaas@chromium.org
CC=fgm@chromium.org

Bug: v8:12191
Change-Id: I26e7a3921aeae30fcce7f0ccc98d790a1a6f8c35
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3440655Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78980}

When performing a shared allocation in a client we have checks for the
AlwaysAllocateScope in both client and shared isolate slow allocation
code paths. We need to enable both such that we don't fail with
spurious OOM failures with GC stress bots.

This change was already introduced with the reverted CL
https://crrev.com/c/3422630. Land this as its own CL until that CL
relands.

Bug: v8:11708, v8:12582
Change-Id: I81ca3f0aaec3ac3fbef9d0b7219e09fa056000f5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3443503Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78979}

Verification code in HeapObject::set_map() is supposed to run on the
main thread since object layout change is only supported on the main
thread. There are some users of set_map() on background threads though,
which resulted in crashes. Since those users all perform a safe map
transition, we introduce a separate method for this purpose:
HeapObject::set_map_safe_transition(). This method behaves just like
set_map() but verifies that this is a safe map transition and not an
object layout change and therefore can be used on background threads
as well.

This CL also adds a DCHECK to HeapObject::set_map() to ensure we run
this method only on the main thread.

Bug: chromium:1293484
Change-Id: I25de6fda08de21b8b7a3645cf0ea5b1334e8a2f6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3439905Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78978}

Turn on fuzzing to get additional test coverage.

Bug: v8:12578
Change-Id: Ia614fb9e4ba519163024f3b7b40f22ad6ebb3297
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3442677Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78977}

Make it include the invalid length again, but this time consistently.

Bug: chromium:923688
Change-Id: I0ec2543e02b58ff2b79547021a8e0d47a9debe46
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3440068Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78976}

We introduce a new information type ForwardingIndex to be stored in
the Name::Hash field (to be used in the future).
To do so we use the 2 least significant bit to distinguish types
of information stored in the hash field (in contrast to only bit 1
to distinguis integer indicies from "real" hashes).
This motivated a refactor to use base::BitField for the hash field.

Bug: v8:12007
Change-Id: I651c86807edfc218792d0db12379374eaa50c930
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3432385Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Patrick Thier <pthier@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78975}