It was originally shipped in https://crrev.com/eef2b9b09723ba1dae3ec0172341e93e9030ada0,
but was reverted due to poor interaction with Blink.

That interaction seems to be fixed thanks to changes to the V8 API
and to @@toStringTag handling on access-checked objects.

BUG=v8:3502
LOG=y
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.v8:v8_linux_nosnap_rel;tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1406293011

Cr-Commit-Position: refs/heads/master@{#31846}

On MIPS arch, all memory accesses (including halfword)
must be aligned to their native size or an alignment exception occurs.
The kernel will fix this up, but with performance penalty.

TEST=test-bytecode-generator/CallRuntime
BUG=

Review URL: https://codereview.chromium.org/1423373004

Cr-Commit-Position: refs/heads/master@{#31845}

Since enabling destructuring already implies enabling default parameters,
there's not a good way to separate these two. Luckily, they're both
feature-complete (save for destructuring assignment).

This causes us to pass an additional 24 test262 tests.

BUG=v8:811, v8:2160
LOG=y

Review URL: https://codereview.chromium.org/1407393009

Cr-Commit-Position: refs/heads/master@{#31844}

The previous code had a mix of breaks, early returns, and switch/case/if
with fallthrough. Now the pattern is to either return for known errors
or break to the bottom of the switch for unhandled tokens.

Also cleaned up random other stuff in the function: removed unnecessary
local vars, shortened position-fetching calls.

Review URL: https://codereview.chromium.org/1412313009

Cr-Commit-Position: refs/heads/master@{#31843}

http://crrev.com/80a1e004f4ef619b54a2d87bf2108719a8411860 was reverted
due to a Blink test failure. That test has been marked as failing on
the Blink side in https://chromium.googlesource.com/chromium/src/+/ac11c6df133.

BUG=v8:811
LOG=y
TBR=rossberg@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1409093005

Cr-Commit-Position: refs/heads/master@{#31842}

This patch adds UseCounters for the various language modes. This may
be useful for helping us to prioritize future optimization and
language design decisions.

R=adamk
CC=seththompson
BUG=none

Review URL: https://codereview.chromium.org/1429173002

Cr-Commit-Position: refs/heads/master@{#31841}

Revert of Revert "Revert of [es6] Implement destructuring binding in try/catch" (patchset #2 id:20001 of https://codereview.chromium.org/1411323008/ )

Reason for revert:
[Sheriff] Breaks a layout test:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/2750

Please request rebase upstream first if intended.

Original issue's description:
> Revert "Revert of [es6] Implement destructuring binding in try/catch"
>
> Reland try/catch destructuring with a fix for the MemorySanitizer failure:
> initialization_pos needs to be initialized in the DeclarationDescriptor.
>
> This is a one line fix to http://crrev.com/a316db995e6e4253664920652ed4e5a38b2caeba
>
> BUG=v8:811
> LOG=y
>
> Committed: https://crrev.com/80a1e004f4ef619b54a2d87bf2108719a8411860
> Cr-Commit-Position: refs/heads/master@{#31834}

TBR=littledan@chromium.org,rossberg@chromium.org,adamk@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:811

Review URL: https://codereview.chromium.org/1421193006

Cr-Commit-Position: refs/heads/master@{#31840}

LOG=N
BUG=v8:4428

Review URL: https://codereview.chromium.org/1425293007

Cr-Commit-Position: refs/heads/master@{#31839}

R=bmeurer@chromium.org

Committed: https://crrev.com/5a1e42c039ac3379ebe1e7e34fb8163e1ec1493e
Cr-Commit-Position: refs/heads/master@{#31791}

Committed: https://crrev.com/bf5c9af92ac0a5b7f020ac968d3d42ed06aa6144
Cr-Commit-Position: refs/heads/master@{#31805}

Review URL: https://codereview.chromium.org/1428203003

Cr-Commit-Position: refs/heads/master@{#31838}

Revert of [heap] Separate out optimized code map processing. (patchset #2 id:20001 of https://codereview.chromium.org/1421903012/ )

Reason for revert:
Causes GC-Stress failures.

Original issue's description:
> [heap] Separate out optimized code map processing.
>
> This separates the post-processing step for optimized code maps out of
> the CodeFlusher. It uses the complete SharedFunctionInfo::Iterator to
> visit all candidates instead of gathering candidates during marking.
>
> Gathering candidates during marking no longer makes sense, now that the
> majority of SharedFunctionInfo objects will hold such an optimized code
> map. Also it reduces complexity of the implementation. Also conflating
> this mechanism with "code flushing" was confusing.
>
> This reverts commit b6644e84.
>
> R=ulan@chromium.org
>
> Committed: https://crrev.com/bb7a5eb2d89bae25f2b5ecb9515669f0ac73c111
> Cr-Commit-Position: refs/heads/master@{#31836}

TBR=ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1412063012

Cr-Commit-Position: refs/heads/master@{#31837}

This separates the post-processing step for optimized code maps out of
the CodeFlusher. It uses the complete SharedFunctionInfo::Iterator to
visit all candidates instead of gathering candidates during marking.

Gathering candidates during marking no longer makes sense, now that the
majority of SharedFunctionInfo objects will hold such an optimized code
map. Also it reduces complexity of the implementation. Also conflating
this mechanism with "code flushing" was confusing.

This reverts commit b6644e84.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/1421903012

Cr-Commit-Position: refs/heads/master@{#31836}

The new GN rule will enable removal of code which copies natives_blob.bin and
snapshot_blob.bin in Android GN code (for instance "copy_content_shell_assets").

BUG=547162
LOG=Y

Review URL: https://codereview.chromium.org/1412333005

Cr-Commit-Position: refs/heads/master@{#31835}

Reland try/catch destructuring with a fix for the MemorySanitizer failure:
initialization_pos needs to be initialized in the DeclarationDescriptor.

This is a one line fix to http://crrev.com/a316db995e6e4253664920652ed4e5a38b2caeba

BUG=v8:811
LOG=y

Review URL: https://codereview.chromium.org/1411323008

Cr-Commit-Position: refs/heads/master@{#31834}

We are creating a lot of tags. The result is that git 'packs'
some of them. Our parsers in the release script cannot handle
this.

R=machenbach@chromium.org
LONG=N
NOTRY=true

Review URL: https://codereview.chromium.org/1403293009

Cr-Commit-Position: refs/heads/master@{#31833}

Revert of [heap] Separate out optimized code map processing. (patchset #3 id:40001 of https://codereview.chromium.org/1426953006/ )

Reason for revert:
Breaks build: https://uberchromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20nosnap%20-%20debug/builds/3565

Original issue's description:
> [heap] Separate out optimized code map processing.
>
> This separates the post-processing step for optimized code maps out of
> the CodeFlusher. It uses the complete SharedFunctionInfo::Iterator to
> visit all candidates instead of gathering candidates during marking.
>
> Gathering candidates during marking no longer makes sense, now that the
> majority of SharedFunctionInfo objects will hold such an optimized code
> map. Also it reduces complexity of the implementation. Also conflating
> this mechanism with "code flushing" was confusing.
>
> R=ulan@chromium.org
>
> Committed: https://crrev.com/8ad6168d197dd167235c9d342ec7ce37b0daa88b
> Cr-Commit-Position: refs/heads/master@{#31830}

TBR=ulan@chromium.org,yangguo@chromium.org,mvstanton@chromium.org,mstarzinger@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1434503003

Cr-Commit-Position: refs/heads/master@{#31832}

Port ab840259

Also:
- Fix big-endian compiler hints BYTE_OFFSET macro.
- Clean up PPC code access to compiler hints -- which required some new
  SharedFunctionInfo fields to encapsulate kCompilerHintsSmiTagSize.

Original commit message:
    The current implementation of classes throws the TypeError at the wrong
    point, after activating a new context when directly calling a class
    constructor. According to the spec, the TypeError has to be thrown
    in the caller context.

R=bmeurer@chromium.org, cbruni@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
LOG=N
BUG=v8:4428

Review URL: https://codereview.chromium.org/1423713014

Cr-Commit-Position: refs/heads/master@{#31831}

This separates the post-processing step for optimized code maps out of
the CodeFlusher. It uses the complete SharedFunctionInfo::Iterator to
visit all candidates instead of gathering candidates during marking.

Gathering candidates during marking no longer makes sense, now that the
majority of SharedFunctionInfo objects will hold such an optimized code
map. Also it reduces complexity of the implementation. Also conflating
this mechanism with "code flushing" was confusing.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/1426953006

Cr-Commit-Position: refs/heads/master@{#31830}

Review URL: https://codereview.chromium.org/1416243009

Cr-Commit-Position: refs/heads/master@{#31829}

These intrinsics are completely unused and there doesn't seem to an
actual use case for it in the future.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1418663011

Cr-Commit-Position: refs/heads/master@{#31828}

This inserts a new bit set type Function, which is used to represent
JSFunctions, and uses that type in typed lowering to optimize calls
to use the CallFunction builtin directly. Also allows for better typing
of the typeof operator, which can infern "function" for JSFunctions
properly.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1410343016

Cr-Commit-Position: refs/heads/master@{#31827}

Depends on https://codereview.chromium.org/1407373007/
After that CL, all receiver conversion is handled by the call builtin.

BUG=

Review URL: https://codereview.chromium.org/1414883011

Cr-Commit-Position: refs/heads/master@{#31826}

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1412243017

Cr-Commit-Position: refs/heads/master@{#31825}

R=littledan@chromium.org
BUG=v8:3715, v8:4528
LOG=Y

Committed: https://crrev.com/60e8877e161fe6175e19fafce2d6ed1c3999cdb1
Cr-Commit-Position: refs/heads/master@{#31753}

Committed: https://crrev.com/b5c80a31ad266eb38a0cf2ff756be59c66d34aa5
Cr-Commit-Position: refs/heads/master@{#31773}

Committed: https://crrev.com/85494e90bb63a3a9e19a1bf862cb6bfcb0162ee9
Cr-Commit-Position: refs/heads/master@{#31782}

Committed: https://crrev.com/152163c1646b45f5fc5d31a4ec2eb55d7f4a2ffc
Cr-Commit-Position: refs/heads/master@{#31804}

Review URL: https://codereview.chromium.org/1419823010

Cr-Commit-Position: refs/heads/master@{#31824}

This fixes receiver conversion since the Call builtin does it correctly.

BUG=v8:4526
LOG=n

Review URL: https://codereview.chromium.org/1407373007

Cr-Commit-Position: refs/heads/master@{#31823}

The %_StringAdd intrinsic is not used anymore, so no need to keep the
code around.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1420283019

Cr-Commit-Position: refs/heads/master@{#31822}

The %_CallFunction doesn't implement the call sequence properly, it
doesn't do the receiver wrapping, nor does it check for
classConstructor. Also the eager deoptimization for %_CallFunction was
seriously b0rked (we must have been lucky with TurboFan so far).

R=yangguo@chromium.org
BUG=v8:4413
LOG=n

Review URL: https://codereview.chromium.org/1419813010

Cr-Commit-Position: refs/heads/master@{#31821}

TurboFan didn't fully support the relevant ES6 type conversion
intrinsics like %_ToNumber, %_ToLength, %_ToName, %_ToString and
%_ToInteger until now, we always went to the runtime instead.  These
intrinsics are now well supported in TurboFan, and we are even able to
generate quite decent code in some cases.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1428243003

Cr-Commit-Position: refs/heads/master@{#31820}

Review URL: https://codereview.chromium.org/1425013006

Cr-Commit-Position: refs/heads/master@{#31819}

Revert of Implement flag and source getters on RegExp.prototype. (patchset #6 id:110001 of https://codereview.chromium.org/1419823010/ )

Reason for revert:
browser_tests failure with --gtest_filter=ExternallyConnectableMessagingTest.EnablingAndDisabling

Original issue's description:
> Implement flag and source getters on RegExp.prototype.
>
> R=littledan@chromium.org
> BUG=v8:3715, v8:4528
> LOG=Y
>
> Committed: https://crrev.com/60e8877e161fe6175e19fafce2d6ed1c3999cdb1
> Cr-Commit-Position: refs/heads/master@{#31753}
>
> Committed: https://crrev.com/b5c80a31ad266eb38a0cf2ff756be59c66d34aa5
> Cr-Commit-Position: refs/heads/master@{#31773}
>
> Committed: https://crrev.com/85494e90bb63a3a9e19a1bf862cb6bfcb0162ee9
> Cr-Commit-Position: refs/heads/master@{#31782}
>
> Committed: https://crrev.com/152163c1646b45f5fc5d31a4ec2eb55d7f4a2ffc
> Cr-Commit-Position: refs/heads/master@{#31804}

TBR=littledan@chromium.org,jochen@chromium.org,ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3715, v8:4528

Review URL: https://codereview.chromium.org/1426413002

Cr-Commit-Position: refs/heads/master@{#31818}

Revert of Use in-object fields instead of private symbols for regexp slots. (patchset #4 id:60001 of https://codereview.chromium.org/1428203003/ )

Reason for revert:
browser_tests failure with --gtest_filter=ExternallyConnectableMessagingTest.EnablingAndDisabling

Original issue's description:
> Use in-object fields instead of private symbols for regexp slots.
>
> R=bmeurer@chromium.org
>
> Committed: https://crrev.com/5a1e42c039ac3379ebe1e7e34fb8163e1ec1493e
> Cr-Commit-Position: refs/heads/master@{#31791}
>
> Committed: https://crrev.com/bf5c9af92ac0a5b7f020ac968d3d42ed06aa6144
> Cr-Commit-Position: refs/heads/master@{#31805}

TBR=bmeurer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1432453005

Cr-Commit-Position: refs/heads/master@{#31817}

Fix an earlier regression which forbid non-VariableProxy LHS from being
used in for-of loops. Like for-in loops, the spec allows any LHS to be used,
with the sole exception that ObjectLiterals and ArrayLiterals must be valid
AssignmentPatterns.

Also fixes a bug in TurboFan which resulted in incorrectly replacing a variable load with a constant value in some instances, due to the AstLoopAssignmentAnalyzer failing to record the assignment to ForOfStatement's value.

BUG=v8:4418, v8:2720
LOG=N
R=wingo@igalia.com, littledan@chromium.org, adamk@chromium.org, bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1411873004

Cr-Commit-Position: refs/heads/master@{#31816}

  port ab840259 (r31790).

  original commit message:
  The current implementation of classes throws the TypeError at the wrong
  point, after activating a new context when directly calling a class
  constructor. According to the spec, the TypeError has to be thrown
  in the caller context.

BUG=

Review URL: https://codereview.chromium.org/1419793007

Cr-Commit-Position: refs/heads/master@{#31815}

Expose the steps for incremental marking and idle scavenge more directly in
NewSpace. Adjust the NewSpace and Heap interfaces to allow callers to be more
clear about how they are interacting with inline allocation steps. This refactor
prepares the ground for more consumers of inline allocation steps (e.g. sampling
heap profiler.)

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1404523002

Cr-Commit-Position: refs/heads/master@{#31814}

Rolling v8/third_party/icu to 42c58d4e49f2250039f0e98d43e0b76e8f5ca024

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

Review URL: https://codereview.chromium.org/1420993008

Cr-Commit-Position: refs/heads/master@{#31813}

   This CL is a fix for https://codereview.chromium.org/1411223010. (X87: fix
   the deoptimization issue.).

   ArchDeoptimize instruction may contains duplicated x87 double register as input
   parameters. So the scope check is not correct.

BUG=

Review URL: https://codereview.chromium.org/1415023007

Cr-Commit-Position: refs/heads/master@{#31812}

Fix typos in big-endian BYTE_OFFSET macro.

BUG=

Review URL: https://codereview.chromium.org/1433543002

Cr-Commit-Position: refs/heads/master@{#31811}

This patch moves ES2015 ToLength semantics on array operations, etc
to from staging to shipping.

R=adamk
BUG=v8:3087
LOG=Y

Review URL: https://codereview.chromium.org/1433473003

Cr-Commit-Position: refs/heads/master@{#31810}

The maximum indexed element size is maxUint32-1, not maxUint32, because
the maximum length of elements is maxUint32. This patch tweaks the limit
to switch to named properties as appropriate.

BUG=v8:4516
LOG=Y
R=adamk

Review URL: https://codereview.chromium.org/1431503002

Cr-Commit-Position: refs/heads/master@{#31809}

       The CL https://codereview.chromium.org/1409013004 added / changed some test cases.
       Some new test cases use CheckFloatEq(...) and CheckDoubleEq(...) function for result
       check. When GCC compiling the CheckFloatEq() and CheckDoubleEq() function, those inlined
       functions has different behavior comparing with GCC ia32 build and x87 build. The major
       difference is sse float register still has single precision rounding semantic. While X87
       register has no such rounding precsion semantic when directly use register value. The V8
       turbofan JITTed has exactly same result in both X87 and IA32 port.

       So we add the following sentence to do type case to keep the same precision.
          float expect = *i * *j; // *i + *j, etc.

       For test case "RunFloat64MulAndFloat64Add1 / RunFloat64MulAndFloat64Add2 / RunFloat64MulAndFloat64Sub1
       / RunFloat64MulAndFloat64Sub2", the expected result calcaulated by GCC has difference precsion
       when comparing with V8 turbofan result for X87 platform. (Turbofan X87 result is the same as
       IA32 GCC and IA32 Turbofan). So we have to disable those four cases for X87 port.

BUG=

Review URL: https://codereview.chromium.org/1430943002

Cr-Commit-Position: refs/heads/master@{#31808}

From 41f3e782.

BUG=

Review URL: https://codereview.chromium.org/1431843002

Cr-Commit-Position: refs/heads/master@{#31807}