Map::AsElementsKind returns the given map if it already has the desired
elements kind.

Change-Id: Ia9c92eabdb28c82da376eb87f0117dc76414240d
Reviewed-on: https://chromium-review.googlesource.com/1164368Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54941}

For async instantiation of WebAssembly code we had the assumption that
a pending exceptions (an exception which comes from
execution JS code) and an ErrorThrower error cannot occur at the same
time. This assumption turned out to be wrong. With this CL we handle
this case by prefering pending_exceptions over ErrorThrower errors.

In addition I extended the tests for failing instantiation to also
exercise async instantiation, and I added a regression test.

R=clemensh@chromium.org

Bug: chromium:870646
Change-Id: I4cb54ff8642ad4ea193b20f79905c9f6508c2b2e
Reviewed-on: https://chromium-review.googlesource.com/1163511Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54940}

MIPSr1 doesn't support SEB and SEH instructions and this
causes test InstructionSelectorTest.Word32SarWithWord32Shl to fail.

This CL disables this test on MIPSr1.

TEST=unittests/InstructionSelectorTest.Word32SarWithWord32Shl

Change-Id: I284a85210bd0d38374ca339671643560e8a305e2
Reviewed-on: https://chromium-review.googlesource.com/1164363Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Ivica Bogosavljevic <ibogosavljevic@wavecomp.com>
Cr-Commit-Position: refs/heads/master@{#54939}

Change-Id: Ia5fa003e8a3bc205ea0384bea9ebb3f6532a1771
Reviewed-on: https://chromium-review.googlesource.com/1163619Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54938}

This reverts commit 5414884a.

Reason for revert: breaks the roll due to not testing CrOs

Original change's description:
> [api] Remove deprecated functions
> 
> Removes all V8_DEPRECATED functions that weren't recently marked as well
> any V8_DEPRECATE_SOON function that relied on using the address of
> an object to get hold of the Isolate.
> 
> Normally we would have advanced the V8_DEPRECATE_SOON methods to
> V8_DEPRECATE in this release and removed them in the follow release, but
> their continuing presence blocks the work on creating a shared
> Read-Only space where some objects would not belong to any single
> Isolate. In preparation chromium and node.js (via the v8/node github)
> have been modified in advance.
> 
> Bug: v8:7786
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
> Change-Id: I8b4b06189896d94aff908ebcd121b3b38f9b482a
> Reviewed-on: https://chromium-review.googlesource.com/1154915
> Commit-Queue: Dan Elphick <delphick@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54915}

TBR=yangguo@chromium.org,delphick@chromium.org

Change-Id: Iaf23e04d55a95b01b0423effa6cde3c0be5e2ba8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7786
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/1164902Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54937}

- Cover array-indices corner cases around 2**32

Bug: v8:8019
Change-Id: Ic5d81a6944b10067b64ffc596472c076adc49c75
Reviewed-on: https://chromium-review.googlesource.com/1163786Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54936}

R=sigurds@chromium.org

Change-Id: I54df6ab72a3d6836be15d4a26b8a1615628eb872
Reviewed-on: https://chromium-review.googlesource.com/1163703Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54935}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/7d6c957..60ce94a

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/d2f6e76..e19516b

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/82bb756..2ebf9fd

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/657bfc2..42f0661

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

Change-Id: I6673d2a7b45d1ffb4290e449eeb1c73921e5a1c6
Reviewed-on: https://chromium-review.googlesource.com/1164625
Commit-Queue: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Reviewed-by: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#54934}

Change-Id: I4b7ea624fbf99f3d1fc67aa77b0c09a8aedde8c6
Reviewed-on: https://chromium-review.googlesource.com/1161704Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54933}

A recent refactoring accidentally disabled the code path that keeps
negative indices for TypedArrays on the fast path.

Change-Id: I89bbb414f54d04f85af77c6d205705906925c61e
Reviewed-on: https://chromium-review.googlesource.com/1164469Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54932}

- DCHECK(IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) is failed.
- I tried not to select instruction kMipsSeb in case of kMips32r1.

R=ivica.bogosavljevic@mips.com

Bug: v8:8006
Change-Id: If07450b1a35b4e9cb608344e137c032381da224d
Reviewed-on: https://chromium-review.googlesource.com/1160073
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Ivica Bogosavljevic <ibogosavljevic@wavecomp.com>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54931}

- Solves a problem for PPC in a configuration where commit page size
  is 64K. https://chromium-review.googlesource.com/c/v8/v8/+/1149515
- Uses existing VM allocation code to get properly aligned memory.
- Makes sure the size for SetPermissions is a multiple of system page
  size.

Bug:chromium:756050

Change-Id: Ib3799ab7a3bb44b0091c234234c1cc47938379c2
Reviewed-on: https://chromium-review.googlesource.com/1161210
Commit-Queue: Bill Budge <bbudge@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54930}

We want to limit these cases since they result in unecessary work on background threads
doing the streaming parse / compile, and delay the script execution unecessarily
while waiting for the streamer to complete.

BUG=chromium:865098

Change-Id: Ibb3346c2e644bb333521d876d00aeb9cc063b6aa
Reviewed-on: https://chromium-review.googlesource.com/1163669Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54929}

Now we can remove FixedArrayOfWeakCells (this was the last user).

Previous try: https://chromium-review.googlesource.com/1150170

BUG=v8:7308

Change-Id: Ie924e379ea8bbd797430e3ca591019fe001e78ad
Reviewed-on: https://chromium-review.googlesource.com/1154909Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54928}

In Liftoff, bugs often happen only if specific cache states are
constructed. For this, longer sequences of instructions are needed.
Thus, add a few rules to increase the chance of generating longer
sequences.

R=ahaas@chromium.org

Change-Id: I8f112edf0280282bf275585e8a15772013c25245
Reviewed-on: https://chromium-review.googlesource.com/1158695Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54927}

This CL is the first step towards a SetProperty stub, by adding a
stub that redirects to the runtime and replacing every runtime
call-site with a call to this stub.

A followup CL will then add an implementation to the stub similar
to KeyedStoreGenericAssembler::KeyedStoreGeneric().

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

Change-Id: Iff2f913988cada6220d54817d94d011ad6de2b77
Reviewed-on: https://chromium-review.googlesource.com/1163519
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54926}

Change-Id: Icf0507c6e50533c64a42fcf934bb1472ff21f68a
Reviewed-on: https://chromium-review.googlesource.com/1163618
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54925}

Bug: v8:7973
Change-Id: I76308296dd45ef797d1eafd6e2736ccefb54302d
Reviewed-on: https://chromium-review.googlesource.com/1162222Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Hai Dang <dhai@google.com>
Cr-Commit-Position: refs/heads/master@{#54924}

- Trigger serialization for more objects, such as some root maps.
- Serialize more data for certain object kinds.
- Add macros for convenience.
- Mark a few functions as const.

R=jarin@chromium.org
Bug: v8:7790

Change-Id: Id39b97e93728c0b3d87d9546bdf68abd04496c05
Reviewed-on: https://chromium-review.googlesource.com/1158572Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54923}

This is in preparation of making sure that jump table slots don't cross
cache line boundaries. It is only introducing helper functions for back
and forth conversion between "index" and "offset", but should not make
any functional changes yet.

R=ahaas@chromium.org
BUG=v8:8018

Change-Id: I6ab525f9b89a6a15414c043a54c9fffb527a1ab6
Reviewed-on: https://chromium-review.googlesource.com/1163517Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54922}

This reverts commit a5efd507.

Reason for revert: was a GC bug, unrelated to this CL.

Original change's description:
> Revert (partially) "Reland [in-place weak refs] Use WeakArrayList in Heap::noscript_list."
> 
> Reason: flaky wasm crashes.
> 
> This leaves WeakArrayList::RemoveOne (+ tests for it) in place.
> 
> BUG=v8:7308, v8:8014
> 
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
> Change-Id: I1195d061ae7d3c82f921f94f50df3f09a55de5ca
> Reviewed-on: https://chromium-review.googlesource.com/1161904
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Commit-Queue: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54891}

TBR=marja@chromium.org,mlippautz@chromium.org

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

Bug: v8:7308, v8:8014
Change-Id: Id8002e2178ac89378b047dd0acd1bf4e3c272918
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/1162124Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54921}

Check each dependency's validity again right before installing it,
because a GC during preceding installations can theoretically trigger
invalidation for some dependency kinds.

Also inline the IsSane checkers into the constructors.

R=jarin@chromium.org

Change-Id: I1331dee27f01e8fd07cb953dddfed72fd1841559
Reviewed-on: https://chromium-review.googlesource.com/1161933Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54920}

Node.js is using AdjustAmountOfExternalAllocatedMemory to get
external memory from V8 [1]. In addition, they have a unittest
that verifies that AdjustAmountOfExternalAllocatedMemory returns
the correct value [2]. This CL proposes a new way to report
external memory through HeapStatistics.

[1]https://github.com/nodejs/node/blob/07cb69720bec251a1c450b3770db2136ac009778/src/node_process.cc#L187
[2]https://github.com/nodejs/node/blob/master/test/parallel/test-memory-usage.js

Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: Ia58ed0bab1c1d4ee23672e1347b9a00b6705a43c
Reviewed-on: https://chromium-review.googlesource.com/1162156
Commit-Queue: Rodrigo Bruno <rfbpb@google.com>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54919}

And related call sites.

Drive-by: add IntPtrZero() and SmiZero() helpers.

Bug: v8:8015
Change-Id: I83195cf2da858f8d35f25c9a1aa5c40c81df78b9
Reviewed-on: https://chromium-review.googlesource.com/1162169
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54918}

Previously, Intl.PluralRules was mostly implemented in JavaScript. This
patch moves most of the constructor and parts of other methods to C++.

The size of the Intl.PluralRules object is reduced by not storing
MinimumIntegerDigits, MinimumFractionDigits, MaximumFractionDigits,
MinimumSignificantDigits, MaximumSignificantDigits. Instead these are
looked up from icu::DecimalFormat as required.

Another optimziation is that we don't create the result of
resolvedOptions when the Intl.PluralRules object is constructed, but
instead defer until this method is called. In the future, we may want
to cache the result.

This patch also cleans up several error handling paths that shouldn't
happen with ICU and instead just crashes should it ever happen.

Bug: v8:5751
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: I84c5aa6c25c35fe2d336693dee1b36bf3dcd4a79
Reviewed-on: https://chromium-review.googlesource.com/1158701
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54917}

Bug: v8:6666
Change-Id: I577c2ac89e8247d6fc90f1e9dbd0ef14a14fbddc
Reviewed-on: https://chromium-review.googlesource.com/1163246
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54916}

Removes all V8_DEPRECATED functions that weren't recently marked as well
any V8_DEPRECATE_SOON function that relied on using the address of
an object to get hold of the Isolate.

Normally we would have advanced the V8_DEPRECATE_SOON methods to
V8_DEPRECATE in this release and removed them in the follow release, but
their continuing presence blocks the work on creating a shared
Read-Only space where some objects would not belong to any single
Isolate. In preparation chromium and node.js (via the v8/node github)
have been modified in advance.

Bug: v8:7786
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I8b4b06189896d94aff908ebcd121b3b38f9b482a
Reviewed-on: https://chromium-review.googlesource.com/1154915
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54915}

This CL puts off-heap targets (i.e. code addresses for embedded builtins)
in the constant pool on ARM.

We are landing this CL to evaluate impact on benchmarks and code size,
and expect to revert it once we have gathered that data.

Bug: v8:6666

Change-Id: If4935a6fb162cd1ffb34489c6fa9630f10ca2c9f
Reviewed-on: https://chromium-review.googlesource.com/1154924
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54914}

This is not used in Chrome or Node anymore.
(This could also potentially be just removed at this point.)

Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I59ecc216faeb3d56d3a52c548a863544570b6173
Reviewed-on: https://chromium-review.googlesource.com/1161936
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54913}

By using a built-in this functions works with SafeStack and doesn't
require an attribute disabling ASan.

BUG=chromium:864705

Change-Id: I898d42c0b39b07300f1679eba11e7f50cad42120
Reviewed-on: https://chromium-review.googlesource.com/1162669Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54912}

This reverts commit bf5ea813.

Reason for revert: Breaks Sanitizers
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux64%20ASAN/26688

Original change's description:
> [tracing] allow dynamic control of tracing
> 
> If the trace_buffer_ was null, we were returning a pointer to a static
> flag back that permanently disabled that particular trace point.
> 
> This implied an assumption that tracing will be statically enabled at
> process startup, and once it is disabled, it will never be enabled
> again. On Node.js side we want to dynamically enable/disable tracing as per
> programmer intent.
> 
> Change-Id: Ic7a7839b8450ab5c356d85e8e0826f42824907f4
> Reviewed-on: https://chromium-review.googlesource.com/1161518
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Commit-Queue: Ali Ijaz Sheikh <ofrobots@google.com>
> Cr-Commit-Position: refs/heads/master@{#54903}

TBR=yangguo@chromium.org,ofrobots@google.com

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

Change-Id: I9459992e8c2ee403b9ddc8f6b9582d204139f6e8
Reviewed-on: https://chromium-review.googlesource.com/1162122Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54911}

This reverts commit 898f880a.

Reason for revert: TSAN report memory leaks 
This is not related to this CL, but to behavior in tracing-controller.cc. Sorry!

https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8938962708686133568/+/steps/Check_-_slow_path__flakes_/0/logs/memory_grow/0

Original change's description:
> [cpu-profiler] Turn on detailed line info for optimized code
> 
> Cautiously turn on this flag by default to check the impact on
> performance bots. Could show minor regressions in old space and/or
> code_and_metadata memory buckets.
> 
> Bug: v8:7983
> Change-Id: Ic4369cdb0231f4f88eada699da948e8bb48a25fd
> Reviewed-on: https://chromium-review.googlesource.com/1162234
> Commit-Queue: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54908}

TBR=yangguo@chromium.org,petermarshall@chromium.org

Change-Id: If17abee873cb589fc6450231149ccc82e7ca9f7b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7983
Reviewed-on: https://chromium-review.googlesource.com/1163441Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54910}

Bug: chromium:869735
Change-Id: I65c4a1b92e1e0874eabff14e9cf6f5b56dc8d43a
Reviewed-on: https://chromium-review.googlesource.com/1158065Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54909}

Cautiously turn on this flag by default to check the impact on
performance bots. Could show minor regressions in old space and/or
code_and_metadata memory buckets.

Bug: v8:7983
Change-Id: Ic4369cdb0231f4f88eada699da948e8bb48a25fd
Reviewed-on: https://chromium-review.googlesource.com/1162234
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54908}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/e1167bf..7d6c957

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

Change-Id: I135164556a3821e81177cae1cb6e3fadc1cac0ea
Reviewed-on: https://chromium-review.googlesource.com/1163290Reviewed-by: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#54907}

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/d30f108..d2f6e76

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

Change-Id: I9b8393ba556f43a25d69eb353801571cbdb478a0
Reviewed-on: https://chromium-review.googlesource.com/1163073Reviewed-by: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#54906}

This fixes a CHECK failure in MapVerify, and gets the correct behaviour
for uses of the well-known symbols.

BUG=v8:7611, chromium:866229
R=jkummerow@chromium.org, mvstanton@chromium.org, bmeurer@chromium.org

Change-Id: I5d679357b8807ea9d1054121d8d336fe0dd43c7c
Reviewed-on: https://chromium-review.googlesource.com/1162278Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Cr-Commit-Position: refs/heads/master@{#54905}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/641e460..e1167bf

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/eae13a4..d30f108

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/29b7b99..82bb756

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/2175972..657bfc2

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

Change-Id: Ia00fd691a828dff7e0cfadbf5cf81a18c4d4bfb6
Reviewed-on: https://chromium-review.googlesource.com/1162992Reviewed-by: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#54904}

If the trace_buffer_ was null, we were returning a pointer to a static
flag back that permanently disabled that particular trace point.

This implied an assumption that tracing will be statically enabled at
process startup, and once it is disabled, it will never be enabled
again. On Node.js side we want to dynamically enable/disable tracing as per
programmer intent.

Change-Id: Ic7a7839b8450ab5c356d85e8e0826f42824907f4
Reviewed-on: https://chromium-review.googlesource.com/1161518Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Ali Ijaz Sheikh <ofrobots@google.com>
Cr-Commit-Position: refs/heads/master@{#54903}

I have a project that embeds V8 and uses a single `Isolate` from multiple
threads. The program runs just fine, but sometimes the inspector doesn't
stop on the correct line after stepping over a statement that switches
threads behind the scenes, even though the original thread is restored by
the time the next statement is executed.

After some digging, I discovered that the `Debug::ArchiveDebug` and
`Debug::RestoreDebug` methods, which should be responsible for
saving/restoring this `ThreadLocal` information when switching threads,
currently don't do anything.

This commit implements those methods using MemCopy, in the style of other
Archive/Restore methods in the V8 codebase.

Related: https://groups.google.com/forum/#!topic/v8-users/_Qf2rwljRk8

Note: I believe my employer, Meteor Development Group, has previously
signed the CLA using the group email address google-contrib@meteor.com.

R=yangguo@chromium.org,jgruber@chromium.org
CC=info@bnoordhuis.nl

Bug: v8:7230
Change-Id: Id517c873eb81cd53f7216c7efd441b956cf7f943
Reviewed-on: https://chromium-review.googlesource.com/833260
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54902}