Reading --verify_predictable makes me sad, whereas --verify-predictable
makes me happy. This CL introduces more happiness.

R=machenbach@chromium.org

Bug: v8:8834
Change-Id: Id51a75f32e6d5a2f87aed81e058a8b6dff189758
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1550399Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60599}

This adds preliminary support for handling the "br_on_exn" opcode in the
interpreter. It also makes "catch" and "rethrow" use a proper exception
reference instead of a dummy value.

To that end this also adds {Handle<>} as a new kind of {WasmValue} which
is intended to pass reference values (e.g. "anyref" or "except_ref") to
the runtime system. Therefore lifetime of such a {WasmValue} is directly
coupled to any surrounding {HandleScope}.

For now we just store {Handle<>} directly on the simulated operand stack
of the interpreter. This is of course bogus, since the surrounding scope
does not outlive the interpreter activation. Decoupling the lifetime of
the operand stack from a {HandleScope} will be done in a follow-up CL.

As a drive-by this change also implements support for the "ref_null" and
the "ref_is_null" opcodes as a proof-of-concept that the new {WasmValue}
is also applicable to the "anyref" reference type.

R=clemensh@chromium.org
TEST=cctest/test-run-wasm-interpreter/ReferenceTypeLocals
BUG=v8:8091,v8:7581

Change-Id: I2307e0689a19c4aab1d67f1ba6742cb3cc31aa3c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1550299
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60598}

In the process turn the Torque's Arguments type into a real struct
and add interoperability with it and CSA's CodeStubArguments.

This change is motivated by the desire to include Arguments
in structs (e.g. iterators), which is not possible for constexpr
fields.

Bug: v8:7793
Change-Id: I840538b84c4c58fee75e0b9cd3bdbb3b96a6b948
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549162
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60597}

Bug: v8:8834
Change-Id: Iac747d915f50c64bb91ca7b8365a51d96eacd2ed
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549161Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Maciej Goszczycki <goszczycki@google.com>
Cr-Commit-Position: refs/heads/master@{#60596}

- Use IsInRange
- Convert scale to index using >>1 which works for 1, 2, 4
- Use mask to check Reads/Writes accumulator

Change-Id: Iaeb2236a2d179dc70b62fa599c08984800170336
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1541039
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60595}

Rolling v8/base/trace_event/common: https://chromium.googlesource.com/chromium/src/base/trace_event/common/+log/c69a8ff..ebb658a

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/a72af28..c2f2e5a

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/5b63b1f..e1fc0b0

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/8d3ba46..865445e

Rolling v8/third_party/googletest/src: https://chromium.googlesource.com/external/github.com/google/googletest/+log/a18ac39..b617b27

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/82dbc02..b823d94

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: If24d37b7a86a73dcb3526e0a75513b0659758aa7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549791Reviewed-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@{#60594}

During instantiation, exceptions can be thrown when looking up the
imports, e.g. because of proxies. If the exception is thrown
internally, before actually calling out to JS code, it won't be
externally caught.
This CL removes the DCHECK that errornously checked that a pending
exception was externally caught.

R=mstarzinger@chromium.org

Bug: chromium:948228
Change-Id: Idbdb340167c1943f78397cc9b310ef5743755726
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547855Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60593}

Const-qualified fields are allowed in both classes and structs.
In both cases, const fields can only be set via initialization
during construction.

Drive-by: unitialized -> uninitialized

Bug: v8:7793
Change-Id: Idec08df30f7897c756b7dd6f2b10bb6012fefb6a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547853
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60592}

The tiers are now consistently referred to as baselin and top tier.

Bug: v8:9003
Change-Id: I74ad1867aca63bee9eb83b7f0f9fbaf2b1523dcb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547667
Commit-Queue: Frederik Gossen <frgossen@google.com>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60591}

Adds the notion of a "source type" to CpuProfileNode instances, hinting
at the underlying source of the function or state that resulted in the
generation of the node.

Bug: v8:9001
Change-Id: Ie14c54d41b99eb02f54b423fa5d939e9d7f63785
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1510576
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60590}

This CL uses MemCopy in CopyElements, because we think that the input
FixedArrays can never overlap. This CL also adds a DCHECK to ensure
this. If our assumption is wrong, it will be interesting to learn why.

Change-Id: Ib8258b934f43b82b1281481c592762e43b35938f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549154
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60589}

The cache also needs to keep the code alive. The code objects are
import wrappers and not wasm functions (which we will focus on first),
but eventually we would also like to collect unused import wrappers.
This CL explicitly increments the ref count when {WasmCode} is added
to the cache, and derements all ref counts in the destructor.

R=titzer@chromium.org

Bug: v8:8217
Change-Id: I1bfb276b25b359d83900147e75ec47788e1fa8de
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1535825Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60588}

Includes both changing from compressed pointers and to compressed pointers.

Also added tests to the representation changer test

B

Cq-Include-Trybots: luci.v8.try:v8_linux64_pointer_compression_rel_ng,v8_linux64_arm64_pointer_compression_rel_ng
Bug: v8:8977
Change-Id: I8a13f6b7ec2208442aa354949173cc9061bce168
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1533866Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60587}

This introduces a helper class for the immediates to a "br_on_exn"
instruction. It is basically a wrapper around a pair of existing
immediates to simplify PC offset calculations. This is similar to what
is being done for e.g. {MemoryCopyImmediate} already.

R=clemensh@chromium.org
BUG=v8:8091

Change-Id: I85a552baa6bfa78304abc6cf9509aef365d47057
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547865Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60586}

Even though both are allowed in the style guide, it recommends to use
'using', as its syntax is more consistent with the rest of C++.
This CL turns all typedefs in src/regexp to 'using' declarations.

R=jgruber@chromium.org

Bug: v8:8834
Change-Id: I2765c3465fec7e8c42c3a84b924522f220ab5676
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1545904Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60585}

All standard containers provide a method named {empty} to check whether
the container is empty. On {base::Vector}, that method is named
{is_empty}, while {empty} is an unused factory method for creating an
empty {Vector}.
This CL renames {is_empty} to {empty} and removes the unused factory
method.

R=leszeks@chromium.org

Bug: v8:8834
Change-Id: I686bd07527801fbe783c412bc241221d8ec3660a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547862
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60584}

They are already filtered by the incremental marker.

Change-Id: If43a16d54a2b0eb7d6a36482d3439fc7191c31a6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549160
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60583}

This is a reland of 4f051fd5

Relanding after fixing Chromium issues.

Original change's description:
> [ptr-compr][x64] Temporarily enable pointer compression on x64
>
> ... and make sure that the x64 ptr-compr bots proceed testing V8 without
> pointer compression in order to keep testing the full pointer mode.
>
> Bug: v8:7703
> Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng,v8_linux64_tsan_rel
> Change-Id: Iee725deda813425a6f0722948b54976154f50909
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1497139
> Reviewed-by: Michael Hablich <hablich@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60230}

Bug: v8:7703
Change-Id: Ic2d1c2ae41ec645f34963f5f561c33199c72ef4b
Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng,v8_linux64_tsan_rel
Cq-Include-Trybots: luci.chromium.try:fuchsia_x64,linux-rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1535819
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60582}

This is a reland of 3cda21de

Original change's description:
> V8 x64 backend doesn't emit ABI compliant stack frames
> 
> On 64 bit Windows, the OS stack walking does not work because the V8 x64
> backend doesn't emit unwinding info and also because it doesn't emit ABI
> compliant stack frames. See
> https://docs.google.com/document/d/1-wf50jFlii0c_Pr52lm2ZU-49m220nhYMrHDi3vXnh0/edit
> for more details.
> 
> This problem can be fixed by observing that V8 frames usually all have the same
> prolog and epilog:
> 
> push rbp,
> mov rbp, rsp
> ...
> pop rbp
> ret N
> 
> and that it is possible to define XDATA (UNWIND_CODEs) that specify how Windows
> should walk through V8 frames. Furthermore, since V8 Code objects are all
> allocated in the same code-range for an Isolate, it is possible to register a
> single PDATA/XDATA entry to cover stack walking for all the code generated
> inside that code-range.
> 
> This PR contains changes required to enable stack walking on Win64:
> 
> EmbeddedFileWriter now adds assembler directives to the builtins
> snapshot source file (embedded.cc) to emit additional entries in the .pdata and
> in the .xdata section of the V8 executable. This takes care of stack walking
> for embedded builtins. (The case of non-embedded builtins is not supported).
> The x64 Assembler has been modified to collect the information required to emit
> this unwind info for builtins.
> 
> Stack walking for jitted code is handled is Isolate.cpp, by registering
> dynamically PDATA/XDATA for the whole code-range address space every time a new
> Isolate is initialized, and by unregistering them when the Isolate is
> destroyed.
> 
> Stack walking for WASM jitted code is handled is the same way in
> wasm::NativeModule (wasm/wasm-code-manager.cpp).
> 
> It is important to note that Crashpad and Breakpad are already registering
> PDATA/XDATA to manage and report unhandled exceptions (but not for embedded
> builtins). Since it is not possible to register multiple PDATA entries for the
> same address range, a new function is added to the V8 API:
> SetUnhandledExceptionCallback() can be used by an embedder to register its own
> unhandled exception handler for exceptions that arise in v8-generated code.
> V8 embedders should be modified accordingly (code for this is in a separate PR
> in the Chromium repository:
> https://chromium-review.googlesource.com/c/chromium/src/+/1474703).
> 
> All these changes are experimental, behind:
> 
> the 'v8_win64_unwinding_info' build flag, and
> the '--win64-unwinding-info' runtime flag.
> 
> Bug: v8:3598
> Change-Id: Iea455ab6d0e2bf1c556aa1cf870841d44ab6e4b1
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1469329
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Paolo Severini <paolosev@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#60330}

Bug: v8:3598
Change-Id: If988baf7d3e4af165b919d6e54c1ad985f8e25e3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1534618Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Paolo Severini <paolosev@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#60581}

Bug: v8:7317
Change-Id: I54c0505bcdd4354a896a317ce756bc7121f61d48
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1548580Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60580}

Adds the following UMA counters:
- V8.GCMarkingSum: Overall time spent in marking per GC cycle
- V8.GCMainThreadMarkingThroughput: Overall marking throughput
  considering marking time spent on the main thread and
  allocated bytes after GC. Only reported if more than 1MB of
  live objects have been marked in the cycle.

Bug: chromium:945806
Change-Id: I24a37bf59f02da9aba984bed9de62fdb39be8882
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547657
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60579}

There was a negation missing in the check.

Bug: chromium:948559
Change-Id: I54cfdd8b83771d80aebe506e4c2793cef301e48b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549164
Auto-Submit: Mythri Alle <mythria@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60578}

This reverts commit 6beea97e.

Reason for revert: https://crbug.com/942497

Original change's description:
> Reland^2 "[build] disable C++ optimization for mksnapshot code."
>
> This is a reland of a6b95a6a
>
> In addition to UBSan, also ASAN needs optimizations.
> So this CL doesn't disable optimizations for all sanitizer builds.
>
> Original change's description:
> > Reland "[build] disable C++ optimization for mksnapshot code."
> >
> > This is a reland of cee2f772
> >
> > Original change's description:
> > > [build] disable C++ optimization for mksnapshot code.
> > >
> > > By disabling C++ optimizations for code that's only run in mksnapshot,
> > > that is, CSA and Torque-generated code, we can save compile time.
> > > I observed up to 2x improvements of compile time for some files,
> > > while the mksnapshot time did not increase significantly.
> > >
> > > Bug: v8:7629
> > > Change-Id: I96be2966611b2471b68023e0dd9e351d94f0013c
> > > Reviewed-on: https://chromium-review.googlesource.com/c/1460941
> > > Reviewed-by: Yang Guo <yangguo@chromium.org>
> > > Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> > > Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#59585}
> >
> > Bug: v8:7629
> > Change-Id: I8330f93173ab3d7b400e15ea4935bbe8256b250f
> > Reviewed-on: https://chromium-review.googlesource.com/c/1473292
> > Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> > Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> > Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#59606}
>
> Bug: v8:7629
> Change-Id: I42175c472d8e41345573df81645dfe3accc9d8c4
> Reviewed-on: https://chromium-review.googlesource.com/c/1475396
> Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#59632}

TBR=yangguo@chromium.org,sigurds@chromium.org,tebbi@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:7629 chromium:942497
Change-Id: Ie51d7b53440230b41fb763541908cb1162d8850d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549158
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60577}

This reverts commit d746be9c.

Reason for revert: Speculative revert because this CL *might* cause timeouts on several bots:
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20predictable/23351

Original change's description:
> [wasm] Use work-stealing queues for background compilation
> 
> This reduces contention on the mutex protecting the {CompilationState}
> by splitting the compilation unit queues into several queues (one per
> background task). Each task executes its own queue first, and steals
> from other queues once it runs out of work.
> The implementation of the set of work-stealing queues is encapsulated
> in the new {CompilationUnitQueues} class in module-compiler.cc.
> 
> R=​titzer@chromium.org
> 
> Bug: v8:8916
> Change-Id: I5a40314917e7d4a35d7ff9e8ec124ec212beacab
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1543350
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60572}

TBR=mstarzinger@chromium.org,titzer@chromium.org,clemensh@chromium.org

Change-Id: I92d8862ec0ff0002160a62ed9df9b044fc95c93d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8916
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549166Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60576}

This is a reland of 660d8287

Original change's description:
> [debug] Mark toLocaleString and TA#join builtins as side-effect free.
>
> Bug: chromium:940373
> Change-Id: If5f90ff5f873f0687c6a6a4063e0d09d6bbbd556
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1533157
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
> Cr-Commit-Position: refs/heads/master@{#60440}

Bug: chromium:940373
Change-Id: I03fe4c06cad9848db211739170462d52ce3f7acf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1538791Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Cr-Commit-Position: refs/heads/master@{#60575}

... which doesn't respect address hints when reserving an address space
region and therefore makes it impossible to fulfill V8 heap alignment
requirements.

As a workaround we just overreserve address space to ensure that we
will be able to find a properly aligned 4GB subregion.

Bug: v8:7703
Change-Id: Ibf54e5e13131c2640a448944e3a3bae937c8b938
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547861
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60574}

Bug: v8:9020
Change-Id: I405d27541f76d1347ae91e5ab426ede72edb1f32
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1541045
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60573}

This reduces contention on the mutex protecting the {CompilationState}
by splitting the compilation unit queues into several queues (one per
background task). Each task executes its own queue first, and steals
from other queues once it runs out of work.
The implementation of the set of work-stealing queues is encapsulated
in the new {CompilationUnitQueues} class in module-compiler.cc.

R=titzer@chromium.org

Bug: v8:8916
Change-Id: I5a40314917e7d4a35d7ff9e8ec124ec212beacab
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1543350
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60572}

Autoroller updated protobuf which has some different files now.

Change-Id: If3b2f6452d30e754504e8798de5adb8706371cb5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547866
Auto-Submit: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60571}

This reverts commit 37cdcbcf.

Reason for revert: https://crbug.com/948590

Original change's description:
> Update V8 DEPS.
> 
> Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/a72af28..af636cf
> 
> Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/5b63b1f..83131f4
> 
> Rolling v8/third_party/perfetto: https://android.googlesource.com/platform/external/perfetto/+log/21a33af..cb85131
> 
> Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/82dbc02..fdca78e
> 
> TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org
> 
> Change-Id: I28eeadb22b369aab6bc89219bdaa31a3af35a65d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1548591
> Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60563}

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org,v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com

Bug: chromium:948590
Change-Id: Ie04943a871ba1bf93094764e452173ea59acb220
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549157Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60570}

TBR=sigurds@chromium.org
NOTRY=true

Change-Id: I5c6988aa5670deaed59647e2dd4b40ee9c368a20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549155Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60569}

This happened because {EphemeronKeyWriteBarrierFromCode} will also be
called if both table and key are in old-space, and key is an evacuation
candidate.

Bug: chromium:948307, v8:8557
Change-Id: Ic1284209584b74cb343163e4beec632a3f1544b8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547858
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60568}

Bug: v8:7790
Change-Id: I44c722357434a32ae9400a0e44dbc522dafe873a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547849
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60567}

This CL adds all the necessary {WasmCodeRefScope}s in the code base, or
at least a good approximation. A follow-up CL will enable a check that
a {WasmCodeRefScope} exists whenever a pointer to a {WasmCode} object
is returned from the {NativeModule}. This should flush out any missing
scopes.

R=titzer@chromium.org

Bug: v8:8217
Change-Id: I54c7eb39aeb1acde38273c399396e6b1390a4cb2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1533860
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60566}

Don't just DCHECK that intrinsic calls are one-byte, but explicitly
check and return (a failure) when they are not.

Bug: chromium:948248
Change-Id: If2c16f337e9c97e5a585d21a51a985f4abbe1c29
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547857
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60565}

This is a reland of 09fa63a9

Original change's description:
> [wasm-hints] Enabled Lazy Compilation by Hint
>
> Hints for lazy compilation are now taken into consideration. If the
> custom hints section suggests lazy compilatin we do so unless the module
> consists of a single function.
>
> Bug: v8:9003
> Change-Id: Ibdc400453cee20d4d5c814733887b38fb675b220
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1535827
> Commit-Queue: Frederik Gossen <frgossen@google.com>
> Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60557}

Bug: v8:9003
No-Try: true
Change-Id: I8d6f4518aa548c815fba4e6e62d2206129336cc6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547851
Commit-Queue: Frederik Gossen <frgossen@google.com>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60564}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/a72af28..af636cf

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/5b63b1f..83131f4

Rolling v8/third_party/perfetto: https://android.googlesource.com/platform/external/perfetto/+log/21a33af..cb85131

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/82dbc02..fdca78e

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: I28eeadb22b369aab6bc89219bdaa31a3af35a65d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1548591Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60563}

In {TryAllocateBackingStore} we already have two gc-and-retry loops.
This CL adds a third one, and pulls out the gc-and-retry loop to a
helper method.

R=ulan@chromium.org

Bug: v8:8898, chromium:909723
Change-Id: I830aa86b899223825d2e6abfcbacad0ccbf3485b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547666Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60562}

Change-Id: I873a8a53f93d0b43d18f6dbc620a2fa3f4b30d32
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547850Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60561}

This is a reland of dd07cbcf

Original change's description:
> PPC/S390: [heap] Clean-up keys of oldspace weakmaps during scavenge
> 
> Port 6604f182
> 
> Original Commit Message:
> 
>      This CL adds handling for cleaning up weakmap (EphemeronHashTable)
>      keys during scavenge, even if the weakmap resides in oldspace.
> 
> Change-Id: Idf8b6115e57b1229864afefe6ffee85acb5e7547
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1538320
> Reviewed-by: Milad Farazmand <miladfar@ca.ibm.com>
> Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
> Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
> Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
> Cr-Commit-Position: refs/heads/master@{#60446}

Change-Id: I8136d873cfc399c84a4daf4de9a1043f016561cb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1546561
Auto-Submit: Milad Farazmand <miladfar@ca.ibm.com>
Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#60560}