The operation will be used for marking of descriptor arrays.

Bug: v8:8486
Change-Id: If73be030614e2c84c77eaeeff419c08ef34a76e9
Reviewed-on: https://chromium-review.googlesource.com/c/1382456Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58322}

This patch gives DescriptorArray its own visitor id and its
own layout that is independent from the layout of WeakFixedArray.
This allows us to use raw 16-bit integers for keeping track of
the number of descriptors (total, non-slack, and marked).

As a side-effect, we save one word per descriptor array on 64-bit.

v8:8486

Change-Id: If8389dde446319e5b3491abc948b52539dba235c
Reviewed-on: https://chromium-review.googlesource.com/c/1349245
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57845}

This check verifies that all .h files in the src/ directory have an
include guard of the form

 #ifndef V8_PATH_TO_FILE_H_
 #define V8_PATH_TO_FILE_H_
 // ...
 #endif  // V8_PATH_TO_FILE_H_

The check can be skipped with a magic comment:

 // PRESUBMIT_INTENTIONALLY_MISSING_INCLUDE_GUARD

Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I0a7b96abec289ad60f64ba8418f1892a6969596d
Reviewed-on: https://chromium-review.googlesource.com/897487Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51079}

This replaces custom Release_CompareAndSwap implementation with a call
to compiler intrinsic / std:atomic, which is TSAN friendly.

Bug: chromium:694255
Change-Id: Iab67c8f5a3a2329b18030a70f3dbf3cb5530374e
Reviewed-on: https://chromium-review.googlesource.com/622431
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47469}

Bug: chromium:757175
Change-Id: I6c566475a730084e8ab35e6f8505a12c466644ff
Reviewed-on: https://chromium-review.googlesource.com/622430Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47461}

This reduces confusion with GC write barrier. The word "barrier" is
reserved for GC write barrier and "fence" for memory ordering fence.

BUG=v8:6474

Change-Id: Ic4352f04430eaca742b72db1580ee0a42a1ffefb
Reviewed-on: https://chromium-review.googlesource.com/528103Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45813}

This is consistent with C++ memory model and avoids confusion with GC
write barrier.

BUG=

Review-Url: https://codereview.chromium.org/2912773002
Cr-Commit-Position: refs/heads/master@{#45584}

Reland Update implementation of atomics with latest Chromium version but use compiler builtin atomics

BUG=

Review-Url: https://chromiumcodereview.appspot.com/2438273002
Cr-Commit-Position: refs/heads/master@{#40496}

Revert of Update implementation of atomics with latest Chromium version but use compiler builtin atomics (patchset #10 id:190001 of https://chromiumcodereview.appspot.com/2425963002/ )

Reason for revert:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Android%20Arm64%20-%20builder/builds/4851

Original issue's description:
> Update implementation of atomics with latest Chromium version but use compiler builtin atomics
>
> Ideally, we would use the standard library. However, when we are compiling against an older version of the standard library the atomic implementation may be slow.
>
> BUG=

TBR=mlippautz@chromium.org,ulan@chromium.org,jarin@chromium.org,hpayer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://chromiumcodereview.appspot.com/2438983002
Cr-Commit-Position: refs/heads/master@{#40489}

Ideally, we would use the standard library. However, when we are compiling against an older version of the standard library the atomic implementation may be slow.

BUG=

Review-Url: https://chromiumcodereview.appspot.com/2425963002
Cr-Commit-Position: refs/heads/master@{#40488}

Review-Url: https://codereview.chromium.org/2175193003
Cr-Commit-Position: refs/heads/master@{#38081}

This enables linter checking for "readability/namespace" violations
during presubmit and instead marks the few known exceptions that we
allow explicitly.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1371083003

Cr-Commit-Position: refs/heads/master@{#31019}

Forgot to add a file...

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/634463002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24404 ce2b1a6d-e550-0410-aec6-3dcde31c8c00