When global object has proxies we should first call hasProperty and
then call GetProperty according to spec. This cl fixes both
LoadGlobal and LoadLookupGlobal to correctly handle these cases.

Also fixes tests that didn't expect hasProperty to be called.

Change-Id: I3a45df7ae24be74dd46cf04cafbf8c2d7018b3af
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876059
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64580}

When rewiring a block to throw, we need to remove the current block from the list
of predecessors for all of our successors, as well as clearing our current successors.

BUG=v8:9684

Change-Id: I0da063b2ef707f07ea27a5f72cabd2ff9a91cc42
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1881154Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64579}

R=jgruber@chromium.org
BUG=v8:6666,v8:9810

Change-Id: I972983d8e86729843f4a1bbe050e3b37a3c0c61c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1881147Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64578}

A bit was added in the context length slot to indicate if
the context had an extension slot. It turns out that
we need this information much earlier and so this flag is now
in the scope info instead.

This CL removes this bit from length, since it was not
used anymore.

I also renamed HasContextExtension to HasContextExtensionSlot
to differentiate from Context::has_extension which returns
true only if the context has an extension slot and the
extension is not the undefined object.

Bug: v8:9744
Change-Id: I7c37105b7afed34e8f480a64596fab285388f21b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879935
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64577}

Debug infos for embedded builtins (associating a file and line number
with certain code ranges) should only be emitted in debug modes.

This CL disables source position emission in Torque in release builds,
and adds checks that the external filename / source position lists are
empty in release builds.

Bug: v8:9910
Change-Id: Ic69683a2324c3b334150ee2b7da9972fbee56483
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879903Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64576}

This code is triggered by Runtime_ArrayIncludes_Slow. The elements kind
changes from DICTIONARY (with accessor property using
Object.defineProperty) to empty DICTIONARY (by set the length to 0), to
frozen/seal/nonextensible elements. This element kind transition
happened in accessor property by Array.includes.

Bug: v8:9894
Change-Id: I224ceb537ff358a30a6e00414c71d6fe18924bb4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876994
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64575}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/66bcca0..2b40e7b

TBR=machenbach@chromium.org,tmrts@chromium.org

Change-Id: Ice498a61cfe92db159bb1252c027110c783e8ff2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1880337Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#64574}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/5ffa0f3..66bcca0

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/4b1db19..7568fa8

TBR=machenbach@chromium.org,tmrts@chromium.org

Change-Id: I75e5585d71fcb5f7345c3f5eb55539299b89118d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1880335Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#64573}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/a193dcc..5ffa0f3

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/a38631c..4b1db19

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/86244d6..ebba8d7

Rolling v8/third_party/instrumented_libraries: https://chromium.googlesource.com/chromium/src/third_party/instrumented_libraries/+log/e289777..b627b3e

TBR=machenbach@chromium.org,tmrts@chromium.org

Change-Id: I157db7c4d8458a4a489670bbfa5a245b4650f546
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1880333Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#64572}

Bug: v8:9898
Change-Id: Ie6cd40e2dc8e575dbaf8fa8543a93d5dce3dfd64
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1881158
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64571}

Port 36ab93d8

Original Commit Message:

    Port 3cad6bf5

    Original Commit Message:

        This is a reland of c7c47c68.

        This makes TSAN happy in addition to:

        Previously I presumed that the context read from a frame in the profiler was
        a valid context. Turns out that on non-intel we're not guaranteed that the
        frame is properly set up. In the case we looked at, the profiler took a
        sample right before writing the frame marker indicating a builtin frame,
        causing the "context" pointer from that frame to be a bytecode array. Since
        we'll read random garbage on the stack as a possible context pointer, I made
        the code reading the native context from it a little more defensive.

        Original change's description:
        > [runtime] Move Context::native_context to the map
        >
        > Remove the native context slot from contexts by making context maps
        > native-context-specific. Now we require 2 loads to go from a context to the
        > native context, but we have 1 field fewer to store when creating contexts.
        >
        > Change-Id: I3c0d7c50c94060c4129db684f46a567de6f30e8d
        > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1859629
        > Commit-Queue: Toon Verwaest <verwaest@chromium.org>
        > Reviewed-by: Igor Sheludko <ishell@chromium.org>
        > Reviewed-by: Peter Marshall <petermarshall@chromium.org>
        > Reviewed-by: Maya Lekova <mslekova@chromium.org>
        > Reviewed-by: Georg Neis <neis@chromium.org>
        > Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
        > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
        > Cr-Commit-Position: refs/heads/master@{#64296}

R=miladfar@ca.ibm.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I996a1f5096b34fc556918752224ff51889f0a5ce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879443Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#64570}

Some code was moved from code stub assembler here in
https://chromium-review.googlesource.com/c/v8/v8/+/1822041

Bug: v8:9810, v8:6949
Change-Id: I0e6735a6b6d9cd516bddf9a65ce190193e52c38a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1881151Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64569}

Bug: v8:9810, v8:6949
Change-Id: I0985606cb05c44e03390194012bc6f9e8fc8d629
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1881150Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64568}

Change-Id: Ieb7febc3a9a14f3d98898e66443705c1a1de195a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1880903
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64567}

... and reimplement TryNumberToUintPtr.

Bug: v8:4153
Change-Id: I3b683b6a41ebf49229aee4ceea4910e94d35ccca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876817
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64566}

Change-Id: I5f73a541d22257d4fbb21e619ad2b62068c267f6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879940Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64565}

Increment pages_freed each time a page was swept. Before pages_freed
was always 0, which meant that the max_pages-argument did not have any
effect.

Change-Id: Id8908bdeb38e262e09b4069893f8f81209568080
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1872399Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64564}

R=miladfar@ca.ibm.com

Change-Id: I42963b089243c45a3d065fb00e2864500bd33afb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879934Reviewed-by: Milad Farazmand <miladfar@ca.ibm.com>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64563}

R=clemensb@chromium.org
BUG=v8:9810

Change-Id: I4bfd667952cb933a131701c692cad18857df2244
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878711Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64562}

Move around some methods to make LargeObjectSpace (mostly)
thread-independent.

Bug: chromium:1011762
Change-Id: I4cc512979a30fa21fd9cb3a90592761cbb01a303
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878709
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64561}

Both LO_SPACE and NEW_LO_SPACE use the basic page management system of
LargeObjectSpace, but implement different AllocateRaw methods (with
the NEW_LO_SPACE version shadowing the LO_SPACE version).

To clean this up, and allow other future LargeObjectSpace implementations
(in particular, an off-thread variant), refactored the current
LargeObjectSpace into a base class, and make both LargeObjectSpace
(renamed to OldLargeObjectSpace) and NewLargeObjectSpace extend this
class.

Bug: chromium:1011762
Change-Id: I41b45b97f2611611dcfde677213131396df03a5e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876824
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64560}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/b293e4f..a193dcc

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/bf69ed0..a38631c

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/ea98ebb..86244d6

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/aa07e59..662cbb8

TBR=machenbach@chromium.org,tmrts@chromium.org

Change-Id: Iceb07046b9104a8f17303ed25b5d68713ec62216
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1880947Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#64559}

This is a reland of bc8ad334.
The CL was innocent, thus unmodified reland with TBR.

Original change's description:
> [wasm][debug] Report global scope also for compiled frames
>
> The global scope (containing global values and the memory) can be
> produced from the instance alone, hence we can also report it for
> compiled frames.
>
> R=mstarzinger@chromium.org, jgruber@chromium.org
>
> Bug: v8:9676
> Change-Id: I20fbb74a98b00b128b6ed305b92fb56ad7dc7558
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876816
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64547}

TBR=mstarzinger@chromium.org

Bug: v8:9676
Change-Id: I2486a007156b7197d523f62ca3c30e29e7650b63
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879929
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64558}

NOTRY=true

Bug: chromium:1018099
Change-Id: I14de41aac11220fedb58cda9bf5ce66424ff381c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879932Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64557}

This class used to describe unoptimized but compiled frames. All such
frames are by now covered via the architecture-independent description
in the {StandardFrameConstants} class (or one of its subclasses).

R=clemensb@chromium.org
BUG=v8:9810

Change-Id: I294cc6eec7d4a05e88e7aa336f1ebedfa0eb6e98
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878708Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64556}

Basically we expose and put to shame the offending process

R=tmrts@chromium.org

Bug: v8:9855
Change-Id: I322e3f9db487b53e8cbfc8a5edd696fa8b480f84
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878707
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64555}

This reverts commit 2599d3cc.

Reason for revert: Test fails with OOM on Arm64 - N5X (https://ci.chromium.org/p/v8/builders/ci/V8%20Android%20Arm64%20-%20N5X/6514) and is racy on predictable builds (https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20predictable/27044)

Original change's description:
> [wasm] Fix incorrect check for growing shared WebAssembly.memory
> 
> Bug: chromium:1010272
> Change-Id: Ieff61089255ee088fad45f15a0f1a8f93eeec94b
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1869077
> Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64525}

TBR=mstarzinger@chromium.org,gdeepti@chromium.org,ahaas@chromium.org

Change-Id: I738a4021a80202c9b822815b922de31f95054fe6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1010272
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879513Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64554}

This reverts commit 556f44c4.

Reason for revert: Test fatally OOMs on ARM. https://ci.chromium.org/p/v8/builders/ci/V8%20Arm/12336

Original change's description:
> [strings] Fix hash for exactly 512MB long strings
> 
> Bug: chromium:1016237
> Change-Id: Idda1e44b5d578d1213aa54927ca68289bcdce8ac
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878487
> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64552}

TBR=jkummerow@chromium.org,ishell@chromium.org

Change-Id: Ia942469346b0f11fcf853d21717fd127815f7fba
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1016237
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1879669Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64553}

Bug: chromium:1016237
Change-Id: Idda1e44b5d578d1213aa54927ca68289bcdce8ac
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878487
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64552}

On Windows with MSVC, compilation fails because it cannot find
the GetIsolateForPtrCompr identifier.

Change-Id: Ib03f5c5ef34e409242bbbe93ec83b7734012feb2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878712Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64551}

The native context used an empty function scope info. This is inconsistent with the fact the native context has an extension slot, since the empty function scope info doesn't have the extension slot flag set.

This CL creates a scope info dedicated for the native context with the flag set.

Bug: v8:9744
Change-Id: I00459e9a0ca75dd7a0e2add5e9e61747d0635f39
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876821
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64550}

This reverts commit bc8ad334.

Reason for revert: breaks ASAN:
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20ASAN/33137

Original change's description:
> [wasm][debug] Report global scope also for compiled frames
> 
> The global scope (containing global values and the memory) can be
> produced from the instance alone, hence we can also report it for
> compiled frames.
> 
> R=​mstarzinger@chromium.org, jgruber@chromium.org
> 
> Bug: v8:9676
> Change-Id: I20fbb74a98b00b128b6ed305b92fb56ad7dc7558
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876816
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64547}

TBR=mstarzinger@chromium.org,jgruber@chromium.org,clemensb@chromium.org

Change-Id: I7a37723286315235f0c0a63728de58633a3b259e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9676
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878713Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64549}

Add VirtualBoundFunction to the serializer which takes care of
processing the result of Function.prototype.bind.

Add cctest and an mjsunit test.

Bug: v8:7790
Change-Id: Ic2b48d356cbe3b576eb22f58215cc886a8994e31
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1859625
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64548}

The global scope (containing global values and the memory) can be
produced from the instance alone, hence we can also report it for
compiled frames.

R=mstarzinger@chromium.org, jgruber@chromium.org

Bug: v8:9676
Change-Id: I20fbb74a98b00b128b6ed305b92fb56ad7dc7558
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876816Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64547}

Quoting from the spec, the expected behavior for validating unreachable
code is that:

A polymorphic stack cannot underflow, but instead generates
Unknown types as needed.

(https://webassembly.github.io/spec/core/appendix/algorithm.html)

This CL changes the representation of the stack height in the
interpreter's side table builder from unsigned to signed to prevent
underflow, and makes some DCHECKs depend on code reachability.

R=clemensb@chromium.org

Bug: chromium:1017061
Change-Id: I4c999859019d6cefb76c1366ba0e98f199f7a0be
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876813
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64546}

Now that segmented code spaces are enabled for WebAssembly, tests that
allocate a large number of modules should no longer flakily run OOM.

R=clemensb@chromium.org
TEST=mjsunit/wasm/asm-wasm-{i32,f64}
BUG=v8:7899

Change-Id: Iab5d2c1b022cc1f6e44f132b14148c86f148cb54
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876818Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64545}

Bug: v8:9898
Change-Id: I8bd453af9a14b04baec321b13e05918bc7abe093
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876812Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64544}

This is an attempt to get a better understanding of the random crashes
we get in chromium:893973.

Bug: chromium:893973
Change-Id: Ia3b1e9910c9e48efb0bf3233050953f1117a2db9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876819
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64543}

Add an `array_buffer_allocator_shared` field to the
`Isolate::CreateParams` struct that allows embedders to share
ownership of the ArrayBuffer::Allocator with V8, and which in
particular means that when this method is used that the
BackingStore deleter will not perform an use-after-free access to the
Allocator under certain circumstances.

For Background:

tl;dr: This is necessary for Node.js to perform the transition to
V8 7.9, because of the way that ArrayBuffer::Allocators and their
lifetimes currently work there.

In Node.js, each Worker thread has its own ArrayBuffer::Allocator.
Changing that would currently be impractical, as each allocator
depends on per-Isolate state. However, now that backing stores
are managed globally and keep a pointer to the original
ArrayBuffer::Allocator, this means that when transferring an
ArrayBuffer (e.g. from one Worker to another through postMessage()),
the original Allocator has to be kept alive until the ArrayBuffer
no longer exists in the receiving Isolate (or until that Isolate
is disposed). See [1] for an example Node.js test that fails with
V8 7.9.

This problem also existed for SharedArrayBuffers, where Node.js
was broken by V8 earlier for the same reasons (see [2] for the bug
report on that and [3] for the resolution in Node.js).
For SharedArrayBuffers, we already had extensive tracking logic,
so adding a shared_ptr to keep alive the ArrayBuffer::Allocator
was not a significant amount of work. However, the mechanism for
transferring non-shared ArrayBuffers is quite different, and
it seems both easier for us and better for V8 from an API standpoint
to keep the Allocator alive from where it is being referenced.

By sharing memory with the custom deleter function/data pair,
this comes at no memory overhead.

[1]: https://github.com/nodejs/node/pull/30044
[2]: https://github.com/nodejs/node-v8/issues/115
[3]: https://github.com/nodejs/node/pull/29637

Bug: v8:9380
Change-Id: Ibc2c4fb6341b53653cbd637bd8cb3d4ac43809c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1874347
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64542}

The CL fixes the following builtins:
  Atomics.add
  Atomics.and
  Atomics.compareExchange
  Atomics.exchange
  Atomics.load
  Atomics.or
  Atomics.store
  Atomics.sub
  Atomics.xor

Bug: v8:4153
Change-Id: Id6170fd093f6e2f9690838b4b789719ed2fc343c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876847
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64541}