ES2016 changed the default timezone of dates to be conditional on
whether a time is included. The semantics were a compromise approach
based on web compatibility feedback from V8, but until now, we have been
shipping ES5.1 default timezone semantics. This patch implements the
new semantics, following ChakraCore and SpiderMonkey (though JSC
implements V8's previous semantics).

BUG=chromium:589858

Review-Url: https://codereview.chromium.org/2648603002
Cr-Commit-Position: refs/heads/master@{#43239}

Patch adopted from mvstanton@ ( https://codereview.chromium.org/2657413002/ )

BUG=

Change-Id: I4296b3d5694116e250a6bb88296fbed0f0c444e6
Reviewed-on: https://chromium-review.googlesource.com/443246Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43238}

This is in order to prevent accidental bugs in desugarings.

R=adamk@chromium.org
BUG=v8:5636

Review-Url: https://codereview.chromium.org/2693313002
Cr-Commit-Position: refs/heads/master@{#43237}

BUG=chromium:690003

Change-Id: I0f80911426e9b201be61af313b4b5cacbb357bb5
Reviewed-on: https://chromium-review.googlesource.com/443329Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43236}

This handles arithmetic addition operations during the early type-hint
lowering (i.e. during graph construction). The string addition case is
still handled by {JSTypedLowering} as it needs static type information.

R=bmeurer@chromium.org

Change-Id: I9df47dfc5bf7613c51f6d803ab43d5d3f6c21be8
Reviewed-on: https://chromium-review.googlesource.com/443185Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43235}

@@replace has a pretty complex implementation, taking different paths
for various situations (e.g.: global/nonglobal regexp, functional/string
replace argument, etc.). Each of these paths must implement similar
logic for calling into the RegExpBuiltinExec spec operation, and many
paths get this subtly wrong.

This CL fixes a couple of issues related to the way @@replace handles lastIndex:
* All paths now respect lastIndex when calling into exec (some used to assume 0).
* lastIndex is now advanced after a successful match for sticky regexps.
* lastIndex is now only reset to 0 on failure for sticky regexps.

BUG=v8:5361

Review-Url: https://codereview.chromium.org/2685183003
Cr-Commit-Position: refs/heads/master@{#43234}

The parser was finalizing the inner block scope, but not clearing the
inner block's scope pointer. This doesn't (yet) have any behavioral
difference, but makes it easier to make assumptions about the structure
of the AST vs the scope chain.

R=neis@chromium.org

Review-Url: https://codereview.chromium.org/2696233003
Cr-Commit-Position: refs/heads/master@{#43233}

This was omitted in:
https://codereview.chromium.org/2615623003

TBR=clemensh@chromium.org,mtrofin@chromium.org
NOTRY=true

Change-Id: I78449fe72e27976b95a9557e0bd8f986ed8caa64
Reviewed-on: https://chromium-review.googlesource.com/443526Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43232}

The inspector uses V8's API handles and should not access
V8 internals. This change makes sure it can use the coverage
data in an encapsulated way.

R=jgruber@chromium.org, kozyatinskiy@chromium.org
BUG=v8:5808

Review-Url: https://codereview.chromium.org/2696163002
Cr-Commit-Position: refs/heads/master@{#43231}

- Clear flags to avoid the quite expensive query for whether this page
  is to be swept.
- Use a vector instead of a list as we always expect a small number of
  pages to go through the pool and we want to avoid memory management on
  this path.

BUG=

Change-Id: If3c0ad480b8e4f3ccf5a0ef43200c5269822245d
Reviewed-on: https://chromium-review.googlesource.com/443248
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43230}

This wraps float arrays with a proxy to make raw buffer use slow paths avoiding different NAN patterns.

This also mocks out large typed arrays when passing the lenth as third constructor parameter.

BUG=chromium:691287,chromium:690898
NOTRY=true

Change-Id: Ic4295b0d8690e5209aceeda9ed93efdd580194c0
Reviewed-on: https://chromium-review.googlesource.com/441624
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43229}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/5af1827..c8fd116

Rolling v8/test/wasm-js: https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+log/680fa9a..b96d096

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/7336c94..574285d

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

Change-Id: Ib309b71a427e5e53b75ec3c803f63c699936bbbb
Reviewed-on: https://chromium-review.googlesource.com/443665Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43228}

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2697713006
Cr-Commit-Position: refs/heads/master@{#43227}

R=gsathya@chromium.org

Review-Url: https://codereview.chromium.org/2693063005
Cr-Commit-Position: refs/heads/master@{#43226}

Some of these functions are invoked by BytecodeGenerator due to parser
desugarings, and moving the context indices cause
BytecodeExpectationsPrinter to render them as something
useful/meaningful.

BUG=
R=jgruber@chromium.org, adamk@chromium.org

Review-Url: https://codereview.chromium.org/2695323002
Cr-Commit-Position: refs/heads/master@{#43225}

When --harmony-async-iteration is enabled, it is now possible to
use the for-await-of loop, which uses the Async Iteration protocol
rather than the ordinary ES6 Iteration protocol.

the Async-from-Sync Iterator object is not implemented in this CL,
and so for-await-of loops will abort execution if the iterated object
does not have a Symbol.asyncIterator() method. Async-from-Sync
Iterators are implemented seperately in https://codereview.chromium.org/2645313003/

BUG=v8:5855, v8:4483
R=neis@chromium.org, littledan@chromium.org, adamk@chromium.org

Review-Url: https://codereview.chromium.org/2637403008
Cr-Commit-Position: refs/heads/master@{#43224}

BUG=

Change-Id: I7215f298d7da4f5104449cc9198588801642bba1
Reviewed-on: https://chromium-review.googlesource.com/443126Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43223}

The mips64 implementation always ended up in the slowpath due to some
loads that were the wrong width, so that is also fixed here.

BUG=v8:5974

Change-Id: Ie448a1fab5b7fca87597c5a1bf75443864e30c28
Reviewed-on: https://chromium-review.googlesource.com/443247
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43222}

These experimental natives previously only installed functions to the
appropriate parent. In this patch, the exports container is retained
so that the bootstrapper may install the functions instead. This
change is intended to reduce startup time. SharedArrayBuffer retains
some experimental natives exported from JS; this may be addressed
in a follow-on patch. The patch includes some minor cleanup of the
bootstrap process by removing "experimental exports", which was unused.

R=yangguo@chromium.org
BUG=v8:5880
CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_linux_noi18n_rel_ng

Review-Url: https://codereview.chromium.org/2683083003
Cr-Commit-Position: refs/heads/master@{#43221}

- Different places used is_simple to mean different things; renamed one.

- No need to do Scope::SetHasNoSimpleParameters multiple times.

- Normally we create VAR parameters with a name, or (for destructuring
  parameters), TEMPORARY parmeters with an empty name. *Except* for
  destructuring rest parameters; then we create VAR a parameter with an empty
  name. This CL makes the empty-named parameter TEMPORARY instead of VAR.

- This makes it clear that Parser::DeclareFormalParameters declares exactly
  those params which Parser::BuildParamerterInitializationBlock doesn't declare.

- This unification doesn't change any functionality, but it makes sense to do
  since I'll need to make PreParser emulate what Parser does; this way I don't
  need to emulate the weird behavior.

BUG=v8:5501

Change-Id: Ifa6c116bc5908f4e03a36e74f47558888d1582bd
Reviewed-on: https://chromium-review.googlesource.com/443106Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43220}

LOG=N
BUG=v8:4124, v8:5948

Review-Url: https://codereview.chromium.org/2694063005
Cr-Commit-Position: refs/heads/master@{#43219}

This handles all arithmetic binary operations except addition during the
early type-hint lowering (i.e. during graph construction). We still use
static type information to potentially further reduce the speculative
operations down to pure operations during the typed lowering phase.

R=bmeurer@chromium.org

Change-Id: I8b93fd7c46ec8e5b81234a49624d503520c3d082
Reviewed-on: https://chromium-review.googlesource.com/443105Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43218}

- Add benchmark for sorting of Float64Array
- Rename existing typedarray.js to copywithin.js

BUG=v8:5953
R=bmeurer@chromium.org, caitp@chromium.org, petermarshall@chromium.org

Review-Url: https://codereview.chromium.org/2691423003
Cr-Commit-Position: refs/heads/master@{#43217}

This CL changes the datastructure to store live variables from a
std::bitset<256> to a std::vector<bool> to support an arbitrary number
of locals. Unfortunately, std::vector<bool> does not define |= and &=
operators, so I added them on the Environment class.

R=vegorov@chromium.org, mstarzinger@chromium.org, machenbach@chromium.org
BUG=v8:5970

Review-Url: https://codereview.chromium.org/2694103005
Cr-Commit-Position: refs/heads/master@{#43216}

Isolate::Dispose calls i::Isolate::TearDown, which again calls
i::Isolate::DumpAndResetCompilationStats.
We need this to be called on each exit path for dumping runtime call
stats.

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

Review-Url: https://codereview.chromium.org/2694933004
Cr-Commit-Position: refs/heads/master@{#43215}

The API class is v8::ArrayBuffer; JSArrayBuffer is the internal counterpart,
but its name should not appear in a public API comment.

Review-Url: https://codereview.chromium.org/2692853007
Cr-Commit-Position: refs/heads/master@{#43214}

- Removes shared InnerArrayCopyWithin JS builtin from src/js/array.js
- Implements %TypedArray%.prototype.copyWithin as a C++ builtin, which
relies on std::memmove rather than accessing individual eleements.
- Fixes the case where copyWithin is invoked on a TypedArray with a
detached buffer.
- Add tests to ensure that +/-Infinity (for all 3 parameters) is handled
  correctly by the
algorithm

The C++ version gets through the benchmark more than 25000 times as
quickly as the JS implementation.

BUG=v8:5925, v8:5929, v8:4648
R=cbruni@chromium.org, adamk@chromium.org, littledan@chromium.org

Review-Url: https://codereview.chromium.org/2697593002
Cr-Commit-Position: refs/heads/master@{#43213}

Down from 16 * kPointerSize.
Modern compilers have good inlining support for memcpy(), so our
custom C++ loop is only beneficial for very short loops (if at all).

BUG=v8:5395

Review-Url: https://codereview.chromium.org/2438583002
Cr-Commit-Position: refs/heads/master@{#43212}

Make use of the previously introduced String feedback for compare
operations in TurboFan.

R=jarin@chromium.org
BUG=v8:5267,v8:5400

Committed: https://crrev.com/5d4253ecfb6ddcbbd7eb5654e728efa9559284a2
Cr-Original-Commit-Position: refs/heads/master@{#41163}
Review-Url: https://codereview.chromium.org/2523463002
Cr-Commit-Position: refs/heads/master@{#43211}

Instead of calling the LoadGlobalIC stub, bytecode handlers now inline
logic for LoadGlobalIC. The LoadGlobalICData case takes a fast path
which omits name loading and frame construction.

BUG=v8:5917

Review-Url: https://codereview.chromium.org/2684973002
Cr-Commit-Position: refs/heads/master@{#43210}

... and don't clear ICs during GC. The IC clearing used to prevent memory
leaks but it's not necessary anymore because all the handlers that need
to embed objects already use weak cells.

This CL unblocks inlining of IC dispatchers into bytecode handlers.

BUG=v8:5917

Change-Id: I229b9ba8dba44f431dfbe8ac5370d855e3e84dd6
Reviewed-on: https://chromium-review.googlesource.com/442127
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43209}

This allows part of typed lowering that is solely based on type-hints to
run as part of the graph construction. The lowering in question does not
inspect types and hence doesn't require the typer to have run before. We
insert the speculative simplied-level operations in favor of the generic
JavaScript-level variants.

R=bmeurer@chromium.org

Change-Id: I5f0549fc1e4ff607622ee9059e6232a32f77db2e
Reviewed-on: https://chromium-review.googlesource.com/442584Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43208}

Use d8 with --lcov=<file> to append coverage info to a file.
The result can be fed into genhtml(1).

R=jgruber@chromium.org
BUG=v8:5808

Review-Url: https://codereview.chromium.org/2695823003
Cr-Commit-Position: refs/heads/master@{#43207}

BUG=

Change-Id: I859fef6b18e51cca80343a89e2b6f38eee95d408
Reviewed-on: https://chromium-review.googlesource.com/442428
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43206}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/0fdcf96..5af1827

Rolling v8/test/wasm-js: https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+log/ab1673f..680fa9a

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/7f34a59..7336c94

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/404d542..7764539

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

Change-Id: I915a059ba5e6abbfee4bfc2887477994b80243ac
Reviewed-on: https://chromium-review.googlesource.com/442905Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43205}

ParserBase::is_any_identifier currently does not recognise
Token::ESCAPED_STRICT_RESERVED_WORD as an identifier. This seems different
from what ParserBase::ParseIdentifierName does, and also prevents
"l\u0065t", unlike "let", from becoming a label.

This CL extends is_any_identifier to also accept ESCAPED_STRICT_RESERVED_WORD.

BUG=v8:5692

Review-Url: https://codereview.chromium.org/2695973003
Cr-Commit-Position: refs/heads/master@{#43204}

The method ExpressionUnexpectedToken is not referenced anywhere apart from its
definition. This CL removes it.

The association with the bug below is only through discovering the dead code
when working on a fix for that bug.

BUG=v8:5692

Review-Url: https://codereview.chromium.org/2688413009
Cr-Commit-Position: refs/heads/master@{#43203}

Previously we captured the PC before calling EnsureSpace in
RecordProtectedInstruction. Sometimes EnsureSpace would resize and move
the buffer, which would invalidate the previously captured PC and trip an
assert when writing RelocInfo. With this change, we do not capture the PC
until after we've ensured there's enough space, which ensures the PC will
be valid.

BUG=

Review-Url: https://codereview.chromium.org/2690523003
Cr-Commit-Position: refs/heads/master@{#43202}

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=5507

Review-Url: https://codereview.chromium.org/2660903003
Cr-Original-Commit-Position: refs/heads/master@{#42821}
Committed: https://chromium.googlesource.com/v8/v8/+/eb9b5edffb8c5acb0abdff0729901f95dbd3ccac
Review-Url: https://codereview.chromium.org/2660903003
Cr-Commit-Position: refs/heads/master@{#43201}

Use them to encode int32 constants properly.
This reduces the generated wasm size in the unity benchmark from
21.6 MB to 16.8 MB (-22.2%).
This hopefully also translates to increased performance especially on
mobile because of lower memory usage.

R=bradnelson@chromium.org, titzer@chromium.org

Review-Url: https://codereview.chromium.org/2692943002
Cr-Commit-Position: refs/heads/master@{#43200}