This fixes various allocator methods to properly propagate {nullptr} to
callers without accidentally dereferencing it. We also disable one test
case for stress mode as it runs out of memory due to inlining limits
being lifted in the stress mode.

R=bmeurer@chromium.org
TEST=mjsunit/array-natives-elements
BUG=v8:6061

Change-Id: Id0a7b826a8612d00b4f4ae8aa0bea011c50890ca
Reviewed-on: https://chromium-review.googlesource.com/451365Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43672}

The immediate passed to cmpw can be either a signed 16-bit or an
unsigned 16-bit integer, but the DCHECK was testing for signed 16-bit
values only.

R=mstarzinger@chromium.org
BUG=v8:6063

Review-Url: https://codereview.chromium.org/2735363002
Cr-Commit-Position: refs/heads/master@{#43671}

Reuse the last LAB's unused area for further newspace allocation.

This is relevant when we expect GCs that use evacuation to compact down
new space to just live bytes for single tasks.

BUG=chromium:651354

Change-Id: Ic418521d98f418a93d3748b824e3ddb6ff7a40c3
Reviewed-on: https://chromium-review.googlesource.com/451398
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@{#43670}

Markbits should be verified in VerifyMarking and friends. The function
may also be used then e.g. iterating just black objects while
incremental marking is active for the fast promotion mode.

BUG=chromium:694255

Change-Id: Ia719a983fec27b2bae03f8c6c3332003a10e8823
Reviewed-on: https://chromium-review.googlesource.com/451363Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43669}

BUG=chromium:696464
R=yangguo@chromium.org

Change-Id: Ie873e8af6af4dd95897f5f85e0eac5a350f59b32
Reviewed-on: https://chromium-review.googlesource.com/449714Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43668}

BUG=

Change-Id: I7aed8e7bd35f59196b1b178942355aef4c97bca8
Reviewed-on: https://chromium-review.googlesource.com/451379Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43667}

BUG=v8:5953

Review-Url: https://codereview.chromium.org/2733393002
Cr-Commit-Position: refs/heads/master@{#43666}

BUG=chromium:651354

Change-Id: Iaa2be2504474842d101f19fa2f6c15baa88544c6
Reviewed-on: https://chromium-review.googlesource.com/451497Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43665}

Revert of Turn on Ignition + TurboFan. (patchset #2 id:20001 of https://codereview.chromium.org/2736723006/ )

Reason for revert:
Collected enough test failures: http://crbug.com/698746

Original issue's description:
> Turn on Ignition + TurboFan.
>
>  _____            _ _   _
> |_   _|          (_) | (_)
>   | |  __ _ _ __  _| |_ _  ___  _ __
>   | | / _` | '_ \| | __| |/ _ \| '_ \
>  _| || (_| | | | | | |_| | (_) | | | |
>  \___/\__, |_| |_|_|\__|_|\___/|_| |_|
>        __/ |
>       |___/
>
>                     _
>                   _| |_
>                  |_   _|
>                    |_|
>
>
>
>  _____          _          ______
> |_   _|        | |         |  ___|
>   | |_   _ _ __| |__   ___ | |_ __ _ _ __
>   | | | | | '__| '_ \ / _ \|  _/ _` | '_ \
>   | | |_| | |  | |_) | (_) | || (_| | | | |
>   \_/\__,_|_|  |_.__/ \___/\_| \__,_|_| |_|
>
>
> BUG=v8:5267, v8:4280, chromium:692409
> NOTREECHECKS=true
>
> Review-Url: https://codereview.chromium.org/2736723006
> Cr-Commit-Position: refs/heads/master@{#43663}
> Committed: https://chromium.googlesource.com/v8/v8/+/e7f8575851a0a56ffe6772d98fd8d90602e6876b

TBR=mstarzinger@chromium.org,danno@chromium.org,bmeurer@chromium.org,rmcilroy@chromium.org,mvstanton@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5267, v8:4280, chromium:692409

Review-Url: https://codereview.chromium.org/2732113005
Cr-Commit-Position: refs/heads/master@{#43664}

 _____            _ _   _
|_   _|          (_) | (_)
  | |  __ _ _ __  _| |_ _  ___  _ __
  | | / _` | '_ \| | __| |/ _ \| '_ \
 _| || (_| | | | | | |_| | (_) | | | |
 \___/\__, |_| |_|_|\__|_|\___/|_| |_|
       __/ |
      |___/

                    _
                  _| |_
                 |_   _|
                   |_|

 _____          _          ______
|_   _|        | |         |  ___|
  | |_   _ _ __| |__   ___ | |_ __ _ _ __
  | | | | | '__| '_ \ / _ \|  _/ _` | '_ \
  | | |_| | |  | |_) | (_) | || (_| | | | |
  \_/\__,_|_|  |_.__/ \___/\_| \__,_|_| |_|

BUG=v8:5267, v8:4280, chromium:692409
NOTREECHECKS=true

Review-Url: https://codereview.chromium.org/2736723006
Cr-Commit-Position: refs/heads/master@{#43663}

R=caseq@chromium.org, pfeldman@chromium.org
BUG=v8:5808

Review-Url: https://codereview.chromium.org/2733783002
Cr-Commit-Position: refs/heads/master@{#43662}

This introduces a new truncation bit for truncation of minus-zero to zero.

At the moment it is only used to handle the limit cases of deopt, such as the
one in the Google maps workload (see simplified version below), where the -q
(which is desugared to q * -1.0) currently deoptimizes because the result would
produce minus zero. To handle this situation, we exploit the knowledge that
righthand side of + cannot be -0, so even if lefthand side was -0, the result
would still be 0 (so the + operation cannot distinguish between left hand side
0 and -0).

function f(q) {
  q -= 4;
  return (-q) + q;
}

f(10);
f(10);
%OptimizeFunctionOnNextCall(f);
f(4);

Review-Url: https://codereview.chromium.org/2734253002
Cr-Commit-Position: refs/heads/master@{#43661}

For nodes

  NumberMin(lhs, rhs)
  NumberMax(lhs, rhs)

we might have feedback types for lhs and rhs that would allow us to
generate unsigned32 or signed32 versions of this operator, which is way
more efficient that going to the full Float64Min/Float64Max operator.
However we cannot promise word32 truncations in this case, since we
based this decision on the feedback types.

This allows us to generate better code for Math.min and Math.max when
one of the inputs is a speculative number operator that provides better
typing during representation selection. We've seen such code in the
hottest function on Google Maps for example.

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

Review-Url: https://codereview.chromium.org/2734193003
Cr-Commit-Position: refs/heads/master@{#43660}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/789a49b..5f4c2a0

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/353ee60..299d02a

Rolling v8/third_party/instrumented_libraries: https://chromium.googlesource.com/chromium/src/third_party/instrumented_libraries/+log/f68b0bb..e905e0f

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

Change-Id: I4ea92a14f0533e39cc4ec1cf556e4cb8480d0d13
Reviewed-on: https://chromium-review.googlesource.com/450761Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43659}

- Implements Float32x4 Mul, Min, Max for ARM.
- Implements Float32x4 relational ops for ARM.
- Implements reciprocal, reciprocal square root estimate/refinement ops for ARM.
- Reorganizes tests to eliminate need for specialized float ref fns in tests.
- Rephrases Gt, Ge in terms of Lt, Le, and eliminates the redundant machine
  operators.
- Renames test-run-wasm-simd test names to match instructions.

LOG=N
BUG=v8:6020

Review-Url: https://codereview.chromium.org/2729943002
Cr-Commit-Position: refs/heads/master@{#43658}

BUG=none
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2737603006
Cr-Commit-Position: refs/heads/master@{#43657}

BUG=none
R=caseq@chromium.org

Review-Url: https://codereview.chromium.org/2740623002
Cr-Commit-Position: refs/heads/master@{#43656}

Once we enabled --turbo by default we need to turn all the implications
off with --no-turbo as well. Chrome sets flags in V8 using SetFlagFromString,
which enforces the implications each time it is called. Therefore, if --turbo
is enabled by default, and an unrelated flag is set, the turbo implications are
enabled but not later disabled if we set --no-turbo. To fix this, add negative
implications as well.

BUG=chromium:692409

Change-Id: Iadb0ca542f49ba65c7419cda8c7a03636a8d5ba9
Reviewed-on: https://chromium-review.googlesource.com/451320
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43655}

Fix two issues in the interpreter entry for 64 bit return values on
32 bit platforms. First, the effect chain was slightly incorrect, second
the order of the returned values was wrong.

Also add a test case for this.
Tested on x64, ia32 and s390.

Plus drive-by fix in Int64Lowering to reuse global constants for
big-endian/little-endian disambiguation.

R=titzer@chromium.org
BUG=v8:5822

Review-Url: https://codereview.chromium.org/2731713002
Cr-Commit-Position: refs/heads/master@{#43654}

Issue 6051 description: "Blink blindly assumes that it can get an
aligned pointer from the 0-th internal field of any object that has two
internal fields."

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

BUG=v8:6051

Change-Id: I814b76e508ffd9fe2326bd0e728129f2a013b807
Reviewed-on: https://chromium-review.googlesource.com/451319Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43653}

BUG=chromium:682617

Change-Id: I58800e5cf1926fabc684e0f140c2856175877bda
Reviewed-on: https://chromium-review.googlesource.com/451418Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43652}

- Fix typo, compare operand diff should be a float.

LOG=N
BUG=v8:6020

Review-Url: https://codereview.chromium.org/2734173003
Cr-Commit-Position: refs/heads/master@{#43651}

Polymorphic IC feedback can contain up to four (map, handler) pairs.

HandlePolymorphicCase already unrolled checks for the first two pairs; these
are guaranteed to exist and can omit bound checks.

This CL unrolls checks against the final two pairs as well.

BUG=v8:5917

Review-Url: https://codereview.chromium.org/2728293005
Cr-Commit-Position: refs/heads/master@{#43650}

This requires serialized data to track the number of API-provided
external references separately.
And it flushes out a case of serialized data corruption (stored "length"
field too large) that we didn't handle without crashing.

BUG=v8:6055

Review-Url: https://codereview.chromium.org/2736923002
Cr-Commit-Position: refs/heads/master@{#43649}

The receiver in the case of Promise.resolve is the promise
constructor, not an instance of Promise.

BUG=chromium:691875

Change-Id: I43e914aac51077b28c7954c8023780b9174df825
Reviewed-on: https://chromium-review.googlesource.com/450884Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43648}

malloc(0) returning 0 is expected behavior on AIX but
compiling with -D_LINUX_SOURCE_COMPAT, malloc(0) should
return a valid pointer (which we do define for AIX). However,
including cstdlib resets the behaviour of _LINUX_SOURCE_COMPAT.
GCC bug: 79839

R=jochen@chromium.org, titzer@chromium.org
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2732743002
Cr-Commit-Position: refs/heads/master@{#43647}

BUG=chromium:698845
NOTRY=true
TBR=hablich@chromium.org,tandrii@chromium.org

Change-Id: I970c984c5e9bd23ca3d951d13243d107fc2a2e3f
Reviewed-on: https://chromium-review.googlesource.com/451280Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Hablich <hablich@chromium.org>
Commit-Queue: Michael Hablich <hablich@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43646}

BUG=chromium:694255

Review-Url: https://codereview.chromium.org/2731363002
Cr-Commit-Position: refs/heads/master@{#43645}

BUG=

Change-Id: I85f9619e0ecb7d0ebee9523e3b4c44ab7f091cfb
Reviewed-on: https://chromium-review.googlesource.com/451380Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43644}

R=titzer@chromium.org, v8-arm-ports@googlegroups.com
BUG=v8:6046

Review-Url: https://codereview.chromium.org/2737493002
Cr-Commit-Position: refs/heads/master@{#43643}

So far we only recognize the special

  NumberFloor(NumberDivide(lhs, rhs))

subgraph when both lhs and rhs are in the Unsigned32 range, and the
result is a PlainNumber. Extend this pattern matching to also cover

  NumberFloor(SpeculativeNumberDivide(lhs, rhs))

and to replace the NumberFloor with NumberToInt32 truncation if the
lhs value is in Signed32 range and the rhs is in Unsigned32 range.

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

Review-Url: https://codereview.chromium.org/2739573004
Cr-Commit-Position: refs/heads/master@{#43642}

This pretty much rewrites the preparsed scope data collection. We used to store
the allocation result, but it's faster to just store the raw data which is
needed for deciding it later. (This way we don't need to run the allocation
algorithm for just getting this data.)

For each variable: is_used, maybe_assigned,
has_forced_context_allocation, and for each scope:
inner_scope_calls_eval_.

In addition, this CL moves data handling out of Scope and into
PreParsedScopeData where it belongs and simplifies the API for
PreParsedScopeData.

BUG=v8:5516
R=vogelheim@chromium.org

Change-Id: Ia5a4fa52f585cd4f483ce9a92f2dd7d9754f34ed
Reviewed-on: https://chromium-review.googlesource.com/451273
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43641}

BUG=v8:6056

Review-Url: https://codereview.chromium.org/2737743002
Cr-Commit-Position: refs/heads/master@{#43640}

Review-Url: https://codereview.chromium.org/2732883004
Cr-Commit-Position: refs/heads/master@{#43639}

BUG=v8:5267, chromium:692409

Review-Url: https://codereview.chromium.org/2720713003
Cr-Commit-Position: refs/heads/master@{#43638}

I originally needed this for the initialization of a constexpr array in
the wasm lazy compile builtin, but since it's a bigger change, I now
split it off as this separate CL.
The style guide recommends constexpr over const. I thus apply the
constexprificaton over all headers that I touched anyway.

I also remove the ARM64_DEFINE_REG_STATICS hack. It was introduced when
merging in arm64 support more than three years ago, and I don't see the
purpose for this.
Also, some #defines can now be constexpr definitions, which was not
possible before according to the comment.

R=bmeurer@chromium.org, mstarzinger@chromium.org, ishell@chromium.org

Change-Id: I6d743b4462c347d363f99e28007bc9e8c84ae617
Reviewed-on: https://chromium-review.googlesource.com/451277Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43637}

BUG=NO

Review-Url: https://codereview.chromium.org/2731263003
Cr-Commit-Position: refs/heads/master@{#43636}

Several code patching paths actually flushed the icache twice.
This CL removes all icache flushing on wasm updates from
assembler.cc and pushes it into the platform specific
unchecked_update_wasm_size and
unchecked_update_wasm_memory_reference methods. They were already
receiving the ICacheFlushMode, and on some platforms would already
perform the flush.

R=ahaas@chromium.org

Change-Id: I388701f13d733cb5387d5bed4dbed33879179a91
Reviewed-on: https://chromium-review.googlesource.com/450246
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43635}

It's unused.

BUG=v8:5717

Change-Id: I2609d8fd686e74ab31ea2f21d247d054305b2cad
Reviewed-on: https://chromium-review.googlesource.com/451357
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43634}

BUG=v8:6048

Change-Id: Iecca35fa73d036ca6043712e3b14bf449ff2e457
Reviewed-on: https://chromium-review.googlesource.com/449734
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43633}