This should be the fastest case, as we can just copy the backing store
directly. Adding this test so that we can monitor if upcoming changes
regress this path.

BUG=v8:5977

Change-Id: I021a199061ac845f265a906bda68b7ad3e8d5708
Reviewed-on: https://chromium-review.googlesource.com/461183Reviewed-by: Franziska Hinkelmann <franzih@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44225}

Review-Url: https://codereview.chromium.org/2775423005
Cr-Commit-Position: refs/heads/master@{#44224}

R=clemensh@chromium.org
BUG=v8:6127

Change-Id: Id77e8eef3ad909608a5d32fa7373077540e201c7
Reviewed-on: https://chromium-review.googlesource.com/461824Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44223}

Change-Id: I8de170892f061a8b30d1e39d1a7d3b4e2fe9230d
Reviewed-on: https://chromium-review.googlesource.com/461823
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44222}

Move builtin definitions (i.e. BUILTIN_LIST and family) to a separate header
in preparation for auto-generation of TFS interface descriptors.

BUG=v8:6116

Review-Url: https://codereview.chromium.org/2784793002
Cr-Commit-Position: refs/heads/master@{#44221}

Now that Ignition has the dedicated TestTypeOf operator, there's not
really a point in doing the typeof with abstract/strict equal combining
in TurboFan anymore. In fact it's counter-productive to do so, as it
might try to cover typeof comparisons in cases where it's better to just
compute the typeof once, i.e.:

  let x = typeof a, y = typeof b;
  if (x === y) {
    if (x === 'string') {
      ...
    }
  }

Here we would combine the second comparison into an ObjectIsString, and
still compute the typeof a.

R=jarin@chromium.org
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2780953003
Cr-Commit-Position: refs/heads/master@{#44220}

R=machenbach@chromium.org
BUG=v8:6127

Change-Id: Ie828f6e0dc6fe9f9f9351aa1afaf7b9dbf536e26
Reviewed-on: https://chromium-review.googlesource.com/461181Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44219}

When we call from TurboFan to a CSA or C++ builtin, we can avoid the
ArgumentsAdaptorFrame in case of a parameter arity mismatch by just
filling up missing arguments with undefined or removing additional
arguments on the call site already. This is safe for CSA/C++ builtins,
since those that care about variable arguments are marked with the
kDontAdaptArgumentsSentinel.

R=danno@chromium.org
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2684963002
Cr-Commit-Position: refs/heads/master@{#44218}

Revert of [inspector] console get all information from inspector when needed (patchset #4 id:60001 of https://codereview.chromium.org/2784713002/ )

Reason for revert:
Breaks layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/14569

Original issue's description:
> [inspector] console get all information from inspector when needed
>
> With this CL we don't need to store reference to InspectedContext inside of JavaScript console object and able to get all required information from callback data.
> It allows us to implement console methods without taking in account how and where we create and store these methods:
> - later we can move console object implementation to builtins..
> - ..and install command line API methods smarter.
>
> BUG=chromium:588893
> R=dgozman@chromium.org
>
> Review-Url: https://codereview.chromium.org/2784713002
> Cr-Commit-Position: refs/heads/master@{#44212}
> Committed: https://chromium.googlesource.com/v8/v8/+/908cd38123df33ce293e4c8d25e407f7ca915f4c

TBR=dgozman@chromium.org,kozyatinskiy@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:588893

Review-Url: https://codereview.chromium.org/2784603003
Cr-Commit-Position: refs/heads/master@{#44217}

Compare bytecode handlers does several checks to collect feedback and
repeats these checks when actually performing the operation. This cl
changes it perform the actual comparison for smi / number along with 
collecting feedback. 

BUG=v8:4280

Change-Id: If0954b68dd232461e08e94a90ccc17604c235b27
Reviewed-on: https://chromium-review.googlesource.com/458420
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44216}

Compilation can fail e.g. on stack overflow. This ensures that we exit
early from StringReplaceGlobalRegExpWithString in that case.

BUG=v8:5437,chromium:705934

Review-Url: https://codereview.chromium.org/2778953004
Cr-Commit-Position: refs/heads/master@{#44215}

Review-Url: https://codereview.chromium.org/2784653003
Cr-Commit-Position: refs/heads/master@{#44214}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/947f28d..133db8f

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/e044353..0c870c7

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/9fbab72..e9e483c

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

Change-Id: Id56c81495145890f5436c904907cb1a75b968d8c
Reviewed-on: https://chromium-review.googlesource.com/461459Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44213}

With this CL we don't need to store reference to InspectedContext inside of JavaScript console object and able to get all required information from callback data.
It allows us to implement console methods without taking in account how and where we create and store these methods:
- later we can move console object implementation to builtins..
- ..and install command line API methods smarter.

BUG=chromium:588893
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2784713002
Cr-Commit-Position: refs/heads/master@{#44212}

Currently, V8 uses the same size counter to measure module sizes for both asm.js
and WASM. This CL separates the counter into two separate counters, and then
uses the appropriate counter when decoding.

BUG=chromium:704922
R=mtrofin@chromium.org,bradnelson@chromium.org

Review-Url: https://codereview.chromium.org/2777203005
Cr-Commit-Position: refs/heads/master@{#44211}

Currently, V* uses the same size counter to measure the maximum number
of memory pages allocated by a module for both asm.js and WASM. This
CL separates the counter into two separate counters, and then uses the
appropriate counter when measuring.

BUG=chromium:704922
R=mtrofin@chromium.org,bradnelson@chromium.org

Review-Url: https://codereview.chromium.org/2783713002
Cr-Commit-Position: refs/heads/master@{#44210}

Should be fixed.

BUG=v8:6161
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2779143002
Cr-Commit-Position: refs/heads/master@{#44209}

A couple bugs had led code in one Context to be able to lead to
estimated memory usage in another Context, even in cases that should be
easy to detect.

- Ensure that the pointer to the next context is nulled out while
  recursing over the portion of the heap. It seems like there was
  previously some code to do this partway, but the nulling part
  was left out.
- Skip including maps in the understanding of the Context estimated
  size, as the maps are shared between Contexts and may be reachable
  from other Contexts

Review-Url: https://codereview.chromium.org/2780773002
Cr-Commit-Position: refs/heads/master@{#44208}

Currently, V8 uses the same counter to measue module decoding peak memory bytes
for both asm.js and WASM. This CL separates the counter into two separate
counters, and then uses the appropriate counter when decoding a module.

BUG=chromium:704922
R=bbudge@chromium.org,bradnelson@chromium.org,mtrofin@chromium.org

Review-Url: https://codereview.chromium.org/2778973003
Cr-Commit-Position: refs/heads/master@{#44207}

Current implementation is unsafe if __proto__ getter is defined on Object.prototype.

BUG=chromium:595206
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2770263003
Cr-Commit-Position: refs/heads/master@{#44206}

Currently, V8 uses the same size counter to measure function byte sizes for both
asm.js and WASM. This CL separates the counter into two separate counters, and
then uses the appropriate counter when decoding.

BUG=chromium:704922
R=bbudge@google.com,bradnelson@chromium.org

Review-Url: https://codereview.chromium.org/2780783003
Cr-Commit-Position: refs/heads/master@{#44205}

Currently, V8 uses the same size counter to measure the minimum number of memory pages allocated by a module for both asm.js and WASM. This CL separates the counter into two separate counters, and then uses the appropriate counter when measuring.

BUG=chromium:704922
R=mtrofin@chromium.org,bradnelson@chromium.org

Review-Url: https://codereview.chromium.org/2781453004
Cr-Commit-Position: refs/heads/master@{#44204}

Fix a few items broken during review of scanner + parser:
* Make the scanner retain stale newline state on a rewind (as otherwise it must be able to correctly rewind that too, though it doesn't need it). (Probably should revisit).
* Change StashCode in the builder skip to the zero case, as it crashes for some reason (added TODO).

Also fix:
* Drop test based on constant expression evaluation in main parser
* Support constant defined based on existing constant.
* Type constants as signed.
* Added a check that all used functions are defined eventually.
* Zone allocate strings for simplicity (TODOs to refactor better).

BUG=v8:6090
BUG=v8:4203
R=mstarzinger@chromium.org,marja@chromium.org,vogelheim@chromium.org

Review-Url: https://codereview.chromium.org/2771183002
Cr-Original-Commit-Position: refs/heads/master@{#44200}
Committed: https://chromium.googlesource.com/v8/v8/+/be0dbdd679b60c31d480d7635e579787a6a218df
Review-Url: https://codereview.chromium.org/2771183002
Cr-Commit-Position: refs/heads/master@{#44203}

Change-Id: I0efbb837026908173739946353334ae7ebf62379
Reviewed-on: https://chromium-review.googlesource.com/461880Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44202}

Revert of [wasm][asm.js] Fix and enable several asm.js tests with the new parser. (patchset #10 id:180001 of https://codereview.chromium.org/2771183002/ )

Reason for revert:
Fails on gc-stress.

Original issue's description:
> [wasm][asm.js] Fix and enable several asm.js tests with the new parser.
>
> Fix a few items broken during review of scanner + parser:
> * Make the scanner retain stale newline state on a rewind (as otherwise it must be able to correctly rewind that too, though it doesn't need it). (Probably should revisit).
> * Change StashCode in the builder skip to the zero case, as it crashes for some reason (added TODO).
>
> Also fix:
> * Drop test based on constant expression evaluation in main parser
> * Support constant defined based on existing constant.
> * Type constants as signed.
> * Added a check that all used functions are defined eventually.
> * Zone allocate strings for simplicity (TODOs to refactor better).
>
> BUG=v8:6090
> BUG=v8:4203
> R=mstarzinger@chromium.org,marja@chromium.org,vogelheim@chromium.org
>
> Review-Url: https://codereview.chromium.org/2771183002
> Cr-Commit-Position: refs/heads/master@{#44200}
> Committed: https://chromium.googlesource.com/v8/v8/+/be0dbdd679b60c31d480d7635e579787a6a218df

TBR=clemensh@chromium.org,bradnelson@google.com,marja@chromium.org,mstarzinger@chromium.org,vogelheim@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:6090

Review-Url: https://codereview.chromium.org/2782613002
Cr-Commit-Position: refs/heads/master@{#44201}

Fix a few items broken during review of scanner + parser:
* Make the scanner retain stale newline state on a rewind (as otherwise it must be able to correctly rewind that too, though it doesn't need it). (Probably should revisit).
* Change StashCode in the builder skip to the zero case, as it crashes for some reason (added TODO).

Also fix:
* Drop test based on constant expression evaluation in main parser
* Support constant defined based on existing constant.
* Type constants as signed.
* Added a check that all used functions are defined eventually.
* Zone allocate strings for simplicity (TODOs to refactor better).

BUG=v8:6090
BUG=v8:4203
R=mstarzinger@chromium.org,marja@chromium.org,vogelheim@chromium.org

Review-Url: https://codereview.chromium.org/2771183002
Cr-Commit-Position: refs/heads/master@{#44200}

Change-Id: I048b7d5229686cf64bed6ec31d118ae1928028a5
Reviewed-on: https://chromium-review.googlesource.com/461939Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44199}

This extends the existing insertion of soft deopts during early lowering
from loads to stores (both named and keyed). It now covers all property
access operations. Next we will handle monomorphic type feedback when
applicable.

R=bmeurer@chromium.org

Change-Id: I6138744682cdbdbdb7274851aa81fb075229c309
Reviewed-on: https://chromium-review.googlesource.com/459482
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44198}

Currently, V8 uses the same counter to collect decoding time for both asm.js and
WASM. This separates the function decoding counter into two separate counters,
and then uses the appropriate counter when decoding a module.

BUG=chromium:704922
R=bbudge@chromium.org,bradnelson@chromium.org

Review-Url: https://codereview.chromium.org/2772363002
Cr-Commit-Position: refs/heads/master@{#44197}

Don't put internalized parser handles in a DeferredHandleScope if we aren't
going to compile concurrently since this has a performance cost.

BUG=chromium:686658

Change-Id: Id89d197b863569346895583e6df79134e79a5d4b
Reviewed-on: https://chromium-review.googlesource.com/461879Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44196}

BUG=v8:6116

Change-Id: I1487165550e938200ce49a022222892752feccae
Reviewed-on: https://chromium-review.googlesource.com/461819Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44195}

BUG=v8:5437

Review-Url: https://codereview.chromium.org/2776263003
Cr-Commit-Position: refs/heads/master@{#44194}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/5dd7ff3..947f28d

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/d979a85..e044353

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

Change-Id: I902b94f5b225847b4bf1ac5a3bea807f4a62e37a
Reviewed-on: https://chromium-review.googlesource.com/461959Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44193}

- support register expression for addresses, e.g.: $r15-1
- show whether addresses are in the minidump with "*"
- show decoded Smis with dd
- dd without arguments continues printing the next words

Change-Id: I1a6a4f9f470c25eee7da1381014252e723ef5f7c
Reviewed-on: https://chromium-review.googlesource.com/461900Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44192}

BUG=

Change-Id: Ibadaef9ee4cb16afa01b782afc07a32bd39ad8aa
Reviewed-on: https://chromium-review.googlesource.com/461140
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44191}

NOTRY=true

Review-Url: https://codereview.chromium.org/2782463002
Cr-Commit-Position: refs/heads/master@{#44190}

Introduce 'contextual keyword' tokens, which are parsed as identifiers but
in some contexts are treated by the parser like proper keywords. These are
usually keywords introduced by recent ECMAScript versions, which for reasons
of backwards compatibility are still permissible as regular identifiers in
most contexts.

Current usage is to check for Token::IDENTIFIER and then do a string
compare. With this change the initial scan will scan them as usual, but
will then record the token as IDENTIFIER plus a secondary token with the
'contextual' value.

BUG=v8:6902

Change-Id: I6ae390382998cf756a23720bd481cb9c0eb78a72
Reviewed-on: https://chromium-review.googlesource.com/459479
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44189}

BUG=

Change-Id: I5e60705764b8ea20b171981cdd44d57a928fa34d
Reviewed-on: https://chromium-review.googlesource.com/461178Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44188}

This extends the existing insertion of soft deopts during early lowering
from named loads to keyed loads as well (i.e. from just {JSLoadName} to
{JSLoadProperty}). Stores will be handled in a follow-up change.

R=bmeurer@chromium.org

Change-Id: I6ad7d0a3561f9160e15e13c64ec5255b4f45e614
Reviewed-on: https://chromium-review.googlesource.com/459421Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44187}

BUG=v8:6116

Change-Id: I8e2587926f9e11f022624778fd5168799d20d2df
Reviewed-on: https://chromium-review.googlesource.com/461158Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44186}