- Remove all relative imports from mock and os
- Fix mocking in a few tests to prevent cross-test side-effects
- Add run_perf_test.py to v8_presubmit.py
- The vpython config was not added since root .vpython already includes
  coverage and mock libraries
- Convert all double-quoted strings to single-quoted (PS8->PS9)

R=sergiyb@chromium.org

Bug: chromium:123456
Change-Id: I7b3a08dc5d950b0f51cc7a5eb3a012ea953ca824
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564206
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60810}

This is a reland of 21adacab

The failure that caused this revert is unrelated to this change
and is fixed in a separate CL (https://crbug.com/v8/9123).

Original change's description:
> Reserve two in-object properties slots for JSErrors
>
> The most common use-case for creating errors is "new Error('message')".
> The resulting JSError object has two properties. The message passed to
> the constructor and an accessor for the stack.
>
> This CL reserves two in-object property slots for these two, so no
> PropertyArray has to be created.
>
> Bug: v8:9116
> Change-Id: I84467453446f333bf65425807707ee6581894e61
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564195
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60791}

Bug: v8:9116
Change-Id: I5b0e0183ca0cbc55739aae9097c08aee34b4fa54
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564059
Auto-Submit: Simon Zünd <szuend@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60809}

Bug: v8:9119, v8:8598
Change-Id: Ia4765c19e60b58d938fe778776ee654b60631e39
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564203
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60808}

This reverts commit 1416d5a5.

Reason for revert: blocks roll https://chromium-review.googlesource.com/c/chromium/src/+/1564550

Original change's description:
> [map] Support in-place field representation changes.
> 
> This adds a new flag --modify-field-representation-inplace (enabled by
> default), which lets the runtime perform field representation changes
> for Smi to Tagged or for HeapObject to Tagged in-place instead of
> creating new maps and marking the previous map tree as deprecated.
> 
> That means we create (a lot) fewer Maps and DescriptorArrays in the
> beginning and also need to self-heal fewer objects later (migrating
> off the deprecated maps). In TurboFan we just take the "field owner
> dependency" whenever we use the field representation, which is very
> similar to what we already do for the field types. That means if we
> change the representation of a field that we used in optimized code,
> we will simply deoptimize that code and have TurboFan potentially
> later optimize it again with the new field representation.
> 
> On the Speedometer2/ElmJS-TodoMVC test, this reduces the total execution
> time from around 415ms to around 352ms, which corresponds to a **15%**
> improvement. The overall Speedometer2 score improves from around 74.1
> to around 78.3 (on local runs with content_shell), corresponding to a
> **5.6%** improvement here. 🎉
> 
> On the CNN desktop browsing story, it seems that we reduce map space
> utilization/fragmentation by about 4-5%. But since we allocate a lot
> less (fewer Maps and DescriptorArrays) we also significantly change
> the GC timing, which heavily influences the results here. So take this
> with a grain of salt. 🤷‍♂️
> 
> Note: For Double fields, this doesn't change anything, meaning they
> still create new maps and deprecate the previous map trees.
> 
> Bug: v8:8749, v8:8865, v8:9114
> Change-Id: I694a53f87ae5caeb868fd98a21809b66d4297d35
> Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
> Doc: http://bit.ly/v8-in-place-field-representation-changes
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1561132
> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Reviewed-by: Georg Neis <neis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60764}

TBR=jarin@chromium.org,neis@chromium.org,ishell@chromium.org,bmeurer@chromium.org,verwaest@chromium.org

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

Bug: v8:8749, v8:8865, v8:9114
Change-Id: I666975d08d51bbe7ab4faec9428b9a1f88e9b322
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564208Reviewed-by: Michael Hablich <hablich@chromium.org>
Commit-Queue: Michael Hablich <hablich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60807}

Bug: v8:9081
Change-Id: I505e8ee4bf58f2da09962ae9a7056931435c10f9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1562587Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60806}

This reverts commit ffe6940f.

Reason for revert: Breaks UBSan bot

Original change's description:
> Reland^2 "[torque] Throw exception instead of aborting if something goes wrong"
> 
> This is a reland of 251d1623
> 
> The reland fixes ASAN component builds by adding RTTI build config to both
> torque executables. Big thanks to sigurds for finding the fix.
> 
> Original change's description:
> > Reland "[torque] Throw exception instead of aborting if something goes wrong"
> >
> > This is a reland of 3bd49f9b
> >
> > The issue on the windows bot is apparently a compiler bug in MSVC related to
> > move construction. The fix seems to be to change the order of the fields in
> > "JsonParseResult" (go figure).
> >
> > Drive-by-change: Fix LS on windows by emitting correct line endings and
> > enabling exceptions for the LS executable as well.
> >
> > Original change's description:
> > > [torque] Throw exception instead of aborting if something goes wrong
> > >
> > > This CL enables exceptions for the Torque compiler and Torque language
> > > server. Instead of aborting when something goes wrong during
> > > compilation, a TorqueError is thrown, containing the error message
> > > and a source position. The compiler executable still prints the error
> > > and aborts, while the language server will pass this information
> > > along to the client (not included in this CL).
> > >
> > > R=danno@chromium.org
> > >
> > > Bug: v8:8880
> > > Change-Id: Iad83c46fb6a91c1babbc0ae7dbd94fbe4e7f1663
> > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1526003
> > > Reviewed-by: Daniel Clifford <danno@chromium.org>
> > > Commit-Queue: Simon Zünd <szuend@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#60512}
> >
> > Bug: v8:8880
> > Change-Id: I00e6591bbb4c516dd7540a7e27196853bc637f11
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1545995
> > Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> > Commit-Queue: Simon Zünd <szuend@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#60736}
> 
> Bug: v8:8880
> Change-Id: Iba198d771169283e83e74324f27aa9e90b8d8975
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1563770
> Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60804}

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

Change-Id: I30ccec8ac28158c102a4e9a01074432172685f96
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8880
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564207Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60805}

This is a reland of 251d1623

The reland fixes ASAN component builds by adding RTTI build config to both
torque executables. Big thanks to sigurds for finding the fix.

Original change's description:
> Reland "[torque] Throw exception instead of aborting if something goes wrong"
>
> This is a reland of 3bd49f9b
>
> The issue on the windows bot is apparently a compiler bug in MSVC related to
> move construction. The fix seems to be to change the order of the fields in
> "JsonParseResult" (go figure).
>
> Drive-by-change: Fix LS on windows by emitting correct line endings and
> enabling exceptions for the LS executable as well.
>
> Original change's description:
> > [torque] Throw exception instead of aborting if something goes wrong
> >
> > This CL enables exceptions for the Torque compiler and Torque language
> > server. Instead of aborting when something goes wrong during
> > compilation, a TorqueError is thrown, containing the error message
> > and a source position. The compiler executable still prints the error
> > and aborts, while the language server will pass this information
> > along to the client (not included in this CL).
> >
> > R=danno@chromium.org
> >
> > Bug: v8:8880
> > Change-Id: Iad83c46fb6a91c1babbc0ae7dbd94fbe4e7f1663
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1526003
> > Reviewed-by: Daniel Clifford <danno@chromium.org>
> > Commit-Queue: Simon Zünd <szuend@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#60512}
>
> Bug: v8:8880
> Change-Id: I00e6591bbb4c516dd7540a7e27196853bc637f11
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1545995
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60736}

Bug: v8:8880
Change-Id: Iba198d771169283e83e74324f27aa9e90b8d8975
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1563770Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60804}

Adding a 'PrepareFunctionForOptimization' call will prevent the test
case in question to become flaky when stress testing bytecode flushing.

R=jarin@chromium.org

Bug: v8:9123
Change-Id: If192ebf571d3cd4f0d1ee31bc3f6313b74d3c866
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564202
Auto-Submit: Simon Zünd <szuend@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60803}

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

Bug: v8:8969
Change-Id: I2e565b114383d085ea5c8dbcff45e3794d4f1f6c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564201Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60802}

This CL changes the Symbol "stack_trace_symbol" to directly hold a
FrameArray instead of wrapping it with a JSArray first.

Bug: v8:9115
Change-Id: I2ac0b1fb380211568abdc6d9f50431c405349dec
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564060Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60801}

For synchronous compilation, the foreground thread takes part in
compilation. It should only compile Liftoff functions though, otherwise
it might unnecessarily delay initial compilation by executing expensive
TurboFan units.

Drive-by: Minor refactoring to avoid else after return.

R=mstarzinger@chromium.org

Bug: v8:8916
Change-Id: Ibf994a9a48417943652f13096419afd73cb59f85
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564192
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60800}

This fix build error(mksnapshot) on mips64el after
https://crrev.com/c/1526009. We should implements
"compress changes" functions on mips64, but now mips64 build
failed while enable pointer compression, we need port some
more pacth to mips64, for example: https://crrev.com/c/1477215

Change-Id: I745cc9b0cf60825f526720db7f5eaedd923b4634
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549133
Commit-Queue: Yu Yin <xwafish@gmail.com>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60799}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/ba0d0b9..f10a653

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/dc0c991..095babf

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/6379cd3..1de3cd4

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

Change-Id: I9b60cb689ab8df25f3bed920e33eca29610ca990
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1565486Reviewed-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@{#60798}

1. Add Intl::NumberFieldToType to support RelativeTimeFormat
by refactoring IcuNumberFieldIdToNumberType
2. Use formatNumericToValue / formatToValue to implement formatToParts

Bug: v8:8837
Change-Id: I4d8fab9c337ec02eeb3500b4c0f90547e48444e3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1560661Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60797}

See intent to ship here: https://groups.google.com/forum/#!topic/v8-users/zM05lYEBVog

wasm-module-builder.js is also changed to use the new syntax for specifying a table
index in an element segment. In the MVP, the table index was always zero. The
reference types proposal adds support for multiple tables, and originally used this
value to specify a non-zero table index. The bulk memory proposal needed a way to
specify a passive element segment, so it re-purposed the table index as a flags field
and uses a different field for the table index.

Bug: v8:7747
Change-Id: If24f2d04e88a29b714f1a78ed417803bae702c76
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1560215
Commit-Queue: Ben Smith <binji@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60796}

Bug: chromium:925244
Change-Id: If9c00f85b1dece93057b541bf0fe1b0a05b81ceb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1565032
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60795}

This is particularly useful to fuzzers that seek to provoke
optimization.

Bug: v8:9119
Change-Id: I729f72a0e22686fbd56793875175c230e0230823
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564196
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60794}

The last step in array.splice slow-path is to update length of the array https://cs.chromium.org/chromium/src/v8/src/builtins/array-splice.tq?rcl=59a29d88cc5972d2323a80a70de19ffd2812e5e4&l=349. For sealed object, it should be nop.

Bug: chromium:951164
Change-Id: I0c3098526c7df6c4dd734dd6c79cc0bba3b9b213
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1559217
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60793}

This reverts commit 21adacab.

Reason for revert: Breaks Mac64 GC Stress Bot

Original change's description:
> Reserve two in-object properties slots for JSErrors
> 
> The most common use-case for creating errors is "new Error('message')".
> The resulting JSError object has two properties. The message passed to
> the constructor and an accessor for the stack.
> 
> This CL reserves two in-object property slots for these two, so no
> PropertyArray has to be created.
> 
> Bug: v8:9116
> Change-Id: I84467453446f333bf65425807707ee6581894e61
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564195
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60791}

TBR=jgruber@chromium.org,bmeurer@chromium.org,szuend@chromium.org

Change-Id: I4667c4f49b3244d7809e8605b3858e246858a413
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9116
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564200Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60792}

The most common use-case for creating errors is "new Error('message')".
The resulting JSError object has two properties. The message passed to
the constructor and an accessor for the stack.

This CL reserves two in-object property slots for these two, so no
PropertyArray has to be created.

Bug: v8:9116
Change-Id: I84467453446f333bf65425807707ee6581894e61
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564195Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60791}

This unifies the logic used for foreground compilation and background
compilation. The main thread used a separate
{FetchAndExecuteCompilationUnit} function so far, which implements the
same as the {BackgroundCompileTask}, but without compiling in batches.

This CL removes that method, and uses the same
{ExecuteCompilationUnits} method from both foreground and background
tasks.

R=mstarzinger@chromium.org

Bug: v8:8916
Change-Id: Id30edb766c46d860a5b0ef45386af7e9fd6a1cc3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564191Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60790}

This avoids accessing the page flags of all old generation PagedSpace pages when starting sweeping.


Bug: v8:9093
Change-Id: Ibdfb35f3e368107f8c364c9498312b01edce47d1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1554688Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60789}

Bug: v8:9110
Change-Id: I834ce91e8c77dc04fa261abb9bd415eb03bf949e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1562732Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60788}

https://chromium.googlesource.com/external/github.com/tc39/test262/+log/6119191..8e5ab69

Bug: v8:7834
Change-Id: I91401fd050a89a8d2d04c1b1ae21ceb7b595305e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1562733Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60787}

It should work when Object.defineProperty is used to set a new value for seal object.
Add more test to cover this case as well.

Bug: chromium:951374
Change-Id: Idbbcc052b627587c71d5b5252340130d0fdfd595
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1562470Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#60786}

Instead of a hack in the {AsyncCompileJob}, handle empty modules by
just calling the callbacks for "baseline finished" and "top tier
finished" immediately, at the point where compilation would be started
usually.

R=mstarzinger@chromium.org

Bug: v8:8916
Change-Id: Id7b32fe2508e5a8902c60865f7f7d675a7a02610
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564054
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60785}

Change-Id: I0618d37226c2a6b55d67d51ad24f95c0f582bb91
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564197
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60784}

Exclude embedder tracing time

Bug: chromium:945806
Change-Id: I9719a42f86fd6edad8fd2b0f707b4dc7feada277
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564437Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60783}

Bug: v8:8976
Change-Id: Ic903d353f05d0c16d4b735bbb1307ff6403fa72e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1559211Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Cr-Commit-Position: refs/heads/master@{#60782}

The shared engine tests started flaking. They are broken since some
time, because the shared pointer to the {NativeModule} has temporary
additional users during compilation (in the {BackgroundCompileScope}).
This CL fixes the test by just removing the checks for use counts.

R=mstarzinger@chromium.org

Bug: v8:9117
Change-Id: Ia55ce66426f8d85c0ed8e4185aa6e507a6d327ef
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564056
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Auto-Submit: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60781}

This adds references to HeapObject fields to Torque.
The syntax is based on Rust (which is essentially C pointer syntax).

The type &T is a reference to T (which must be a scalar type for now).
We can create references from field access expressions, using the
addressof(&) operator:
  &obj.fieldname
To read or assign a reference, we use the dereference(*) operator:
  *someref = *otherref

This CL also uses references internally normal class field accesses,
but only if there is no overload for field accessor functions.
This allows to have overloaded field accessors for a subtype like
FastJSArray. However, there is a change in behavior in that an
operator ".fieldname" will stop reference creation and will therefore
also stop write access to a class field of the same name. That's why
this CL had to add a write overload ".length=" for FastJSArray.

References desugar to a pair of a tagged HeapObject pointer and an
untagged offset into this HeapObject. On the CSA-side, they are
represented by the C++ struct

struct TorqueReference {
  TNode<HeapObject> object;
  TNode<IntPtrT> offset;
};

Bug: v8:7793
Change-Id: Ica6468d47847bd68fb6b85f731cf8fbe142fa401
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1557151
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60780}

The {code_table_} in {NativeModule} is protected by the
{allocation_mutex_}. The {code} and {code_table} accessors did not
acquire this lock though.
This CL removes the unsafe {code_table} accessor, renames {code} to
{GetCode} and protects it by a lock.

R=mstarzinger@chromium.org

Bug: v8:9112
Change-Id: Id2df68460b4c10291a49b4016b9574e02744e8b9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1561315Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60779}

The field type can always be generalized in-place, even for root maps.
There's no need to create defensive copies in this case. This happens
for example in the superWrapper in the Speedometer2/EmberJS-Debug test.

Bug: v8:8834, v8:9114
Change-Id: Ief05516d0e9d84850c52d2cf8815953ef77d5223
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1562131
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60778}

On x64, we allocate one big code region such that we can use near jumps
and near calls. The jump table did not make use of that design yet.
This CL changes that by emitting jump table slots as near jumps. This
also speeds up patching jump table slots significantly, since far jumps
populate the inline constant pool, which is unneeded overhead in this
case.
As a drive-by, this CL cleans up the API of near_call and near_jmp. The
current semantics is broken, and only works because this is only used
for WebAssembly calls which are patched anyway after code generation.
Also, x64 now uses the same path in test-jump-table-assembler.cc as
arm64 to ensure that all targets are within near-call-distance.

R=mstarzinger@chromium.org

Bug: v8:8916
Change-Id: Iffc34e248b72167307ffdab62dd2212c4ae86a32
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1561313Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60777}

Bug: v8:9113
Change-Id: I413d9df34f0bdea9c30db33ad79891218e229341
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564053Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60776}

Change-Id: Ic31b33ef4c290aee31be2d66295978908f568775
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1563410Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Cr-Commit-Position: refs/heads/master@{#60775}

When clearing a DebugInfo, we need to check whether that function is
currently executing and, if so, update the on-stack BytecodeArray
pointer to refer to the original BytecodeArray. Otherwise, the original
BytecodeArray might get flushed, which can cause problems when
attempting to resume execution of the function.

Bug: v8:9067
Change-Id: Ief28a501294f5a34052e13f618fa084311eaa0b8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1548573Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#60774}

... when pointer compression is enabled.

Bug: v8:7581, v8:7703
Change-Id: Ie0928f813458d2ffa9159f5098c4f91bf8cee437
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564052
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60773}

Some code - especially WebAssembly - does not make use of the code
target vector. Unconditionally reserving 100 entries adds unnecessary
overhead e.g. to jump table patching (~10%). This CL just removes this
reservation.

R=mstarzinger@chromium.org

Bug: v8:8916
Change-Id: I671820f3eb413fa2d03cef4bbf06adfc7a585266
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1559868Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60772}

The current NumberEqual check ignores -0 when it is stored to
a constant unboxed double field containing 0.

Bug: v8:9113
Change-Id: I7eb59ca8af09ab7317da3c6ce9c9cedad81f6cae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1561317Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60771}