This groups together all the promise related runtime functions.

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2665983002
Cr-Commit-Position: refs/heads/master@{#42798}

The spec for String.split() requires loading "separator[@@split]".
The KeyedLoadIC for this goes generic right away, but still requires
a runtime call. To avoid that, reshuffle checks in the generic stub
and do the primitive-string -> String-function translation inline.

Review-Url: https://codereview.chromium.org/2654893003
Cr-Commit-Position: refs/heads/master@{#42797}

Test just checks that all basic features are working correctly with modules.

BUG=v8:1569
R=dgozman@chromium.org,alph@chromium.org,adamk@chromium.org

Review-Url: https://codereview.chromium.org/2663743002
Cr-Commit-Position: refs/heads/master@{#42796}

Issues with instance wrapper allocation and JS Api errata have been fixed over the last few weeks, test in the bug no longer fails - enabling tests for imported memory.

BUG=5683

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

Review-Url: https://codereview.chromium.org/2666763002
Cr-Commit-Position: refs/heads/master@{#42795}

The existing unit test explicitly checked for this case, but was - under
the right circumstances - defeated by the optimization to not re-run the
whole position search if we were close enough.

BUG=chromium:685618

Review-Url: https://codereview.chromium.org/2663883002
Cr-Commit-Position: refs/heads/master@{#42794}

Port ca8d3ba7

Original Commit Message:

    Original commit message:
    [wasm] Introduce the TrapIf and TrapUnless operators to generate trap code.

    Some instructions in WebAssembly trap for some inputs, which means that the
    execution is terminated and (at least at the moment) a JavaScript exception is
    thrown. Examples for traps are out-of-bounds memory accesses, or integer
    divisions by zero.

    Without the TrapIf and TrapUnless operators trap check in WebAssembly introduces 5
    TurboFan nodes (branch, if_true, if_false, trap-reason constant, trap-position
    constant), in addition to the trap condition itself. Additionally, each
    WebAssembly function has four TurboFan nodes (merge, effect_phi, 2 phis) whose
    number of inputs is linear to the number of trap checks in the function.
    Especially for functions with high numbers of trap checks we observe a
    significant slowdown in compilation time, down to 0.22 MiB/s in the sqlite
    benchmark instead of the average of 3 MiB/s in other benchmarks. By introducing
    a TrapIf common operator only a single node is necessary per trap check, in
    addition to the trap condition. Also the nodes which are shared between trap
    checks (merge, effect_phi, 2 phis) would disappear. First measurements suggest a
    speedup of 30-50% on average.

    This CL only implements TrapIf and TrapUnless on x64. The implementation is also
    hidden behind the --wasm-trap-if flag.

    Please take a special look at how the source position is transfered from the
    instruction selector to the code generator, and at the context that is used for
    the runtime call.

R=ahaas@chromium.org, titzer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2666433002
Cr-Commit-Position: refs/heads/master@{#42793}

BUG=685318

Change-Id: I6654410beaca18f5d8e0791ed18d0daa46edcae0
Reviewed-on: https://chromium-review.googlesource.com/434177Reviewed-by: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#42792}

R=joransiu@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2662963002
Cr-Commit-Position: refs/heads/master@{#42791}

The bug used to show up when
- we were streaming a script starting with 0xef 0xbb 0xbf
- we aborted preparsing a function (and reset to a bookmark)

BUG=chromium:685618

Review-Url: https://codereview.chromium.org/2663773002
Cr-Commit-Position: refs/heads/master@{#42790}

BUG=chromium:685318
TBR=tandrii@chromium.org

Review-Url: https://codereview.chromium.org/2666563002
Cr-Commit-Position: refs/heads/master@{#42789}

Revert of ValueSerializer: Distinguish between 'undefined' and an absent property. (patchset #2 id:20001 of https://codereview.chromium.org/2660093002/ )

Reason for revert:
Seems to break layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/13146

https://github.com/v8/v8/wiki/Blink-layout-tests

Original issue's description:
> ValueSerializer: Distinguish between 'undefined' and an absent property.
>
> Dealing with this case requires a wire format change. It is possible that an
> element can be absent even in an array where the dense format was chosen
> (because the array initially had no holes), if the elements are modified while
> they are being serialized. In this case, a new tag for the "hole" is emitted.
>
> The logic to treat undefined in dense arrays as an absent property is restricted
> to versions of the wire format that this tag did not exist.
>
> BUG=chromium:686159,chromium:665820
>
> Review-Url: https://codereview.chromium.org/2660093002
> Cr-Commit-Position: refs/heads/master@{#42784}
> Committed: https://chromium.googlesource.com/v8/v8/+/dc85f4c8338c1c824af4f7ee3274dc9f95d14e49

TBR=jkummerow@chromium.org,jbroman@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:686159,chromium:665820

Review-Url: https://codereview.chromium.org/2667553003
Cr-Commit-Position: refs/heads/master@{#42788}

R=mtrofin@chromium.org,verwaest@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2662883003
Cr-Commit-Position: refs/heads/master@{#42787}

On ia32/x64 when casting a sNan to double, the signalling
bit is flipped to qNan.

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

Review-Url: https://codereview.chromium.org/2660873003
Cr-Commit-Position: refs/heads/master@{#42786}

Performing lookups on the prototype chain in the stub avoids a
bunch of slow-path runtime calls. For now, only receivers with
dictionary-mode properties do this; fast-mode receivers will follow
if it's beneficial.

(previously landed as r42751 / 82e10f5f)

Review-Url: https://codereview.chromium.org/2652213003
Cr-Commit-Position: refs/heads/master@{#42785}

Dealing with this case requires a wire format change. It is possible that an
element can be absent even in an array where the dense format was chosen
(because the array initially had no holes), if the elements are modified while
they are being serialized. In this case, a new tag for the "hole" is emitted.

The logic to treat undefined in dense arrays as an absent property is restricted
to versions of the wire format that this tag did not exist.

BUG=chromium:686159,chromium:665820

Review-Url: https://codereview.chromium.org/2660093002
Cr-Commit-Position: refs/heads/master@{#42784}

BUG=chromium:685504

Review-Url: https://codereview.chromium.org/2660823002
Cr-Commit-Position: refs/heads/master@{#42783}

BUG=chromium:685965

Review-Url: https://codereview.chromium.org/2660123002
Cr-Commit-Position: refs/heads/master@{#42782}

When WebAssembly.Table initial size is greater than the declared initial size, table size references should be updated on instantiate for functions to be called at indices greater than the declared initial size.

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

Review-Url: https://codereview.chromium.org/2661773002
Cr-Commit-Position: refs/heads/master@{#42781}

Without this CL we have only limit for amount of console messages and if user are dumping a huge messages we pretty soon run out of memory.
So let's introduce limit for memory consumption it would help chromium and Node.js as well.

BUG=chromium:671489
R=dgozman@chomium.org,alph@chromium.org, hpayer@chromium.org, ulan@chromium.org

Review-Url: https://codereview.chromium.org/2653293003
Cr-Commit-Position: refs/heads/master@{#42780}

Compiles simply take too long, and such functions are liable to deopt
quickly.

BUG=chromium:686153

Review-Url: https://codereview.chromium.org/2667573002
Cr-Commit-Position: refs/heads/master@{#42779}

Port 93f05b64

Original Commit Message:

    They have the same lifetime. It's a match!

    Both structures are native context dependent and dealt with (creation,
    clearing, gathering feedback) at the same time. By treating the spaces used
    for literal boilerplates as feedback vector slots, we no longer have to keep
    track of the materialized literal count elsewhere.

    A follow-on CL removes even more parser infrastructure related to this count.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:5456
LOG=N

Review-Url: https://codereview.chromium.org/2659413002
Cr-Commit-Position: refs/heads/master@{#42778}

BUG=v8:5904,chromium:639217
R=mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2660103002
Cr-Commit-Position: refs/heads/master@{#42777}

The graphs don't show any performance bump for
https://codereview.chromium.org/2659623002, which I do see a much better result for
locally. I suspect the function isn't being optimized in turbofan when the
benchmarks run. Maybe this warmup flag will trigger that.

BUG=v8:5895

Review-Url: https://codereview.chromium.org/2664783002
Cr-Commit-Position: refs/heads/master@{#42776}

We can constant-fold ReferenceEqual(a,b) to false, if the intersection
of the types of a and b is empty. This also repairs a regression in the
RestParameter performance test.

R=petermarshall@chromium.org
BUG=chromium:686668

Review-Url: https://codereview.chromium.org/2666543002
Cr-Commit-Position: refs/heads/master@{#42775}

Review-Url: https://codereview.chromium.org/2657293002
Cr-Commit-Position: refs/heads/master@{#42774}

Review-Url: https://codereview.chromium.org/2655023009
Cr-Commit-Position: refs/heads/master@{#42773}

BUG=chromium:681236
NOTRY=true
TBR=bradnelson@chromium.org, titzer@chromium.org

Review-Url: https://codereview.chromium.org/2662823002
Cr-Commit-Position: refs/heads/master@{#42772}

They have the same lifetime. It's a match!

Both structures are native context dependent and dealt with (creation,
clearing, gathering feedback) at the same time. By treating the spaces used
for literal boilerplates as feedback vector slots, we no longer have to keep
track of the materialized literal count elsewhere.

A follow-on CL removes even more parser infrastructure related to this count.

BUG=v8:5456

Review-Url: https://codereview.chromium.org/2655853010
Cr-Commit-Position: refs/heads/master@{#42771}

Review-Url: https://codereview.chromium.org/2626013002
Cr-Original-Commit-Position: refs/heads/master@{#42229}
Committed: https://chromium.googlesource.com/v8/v8/+/30176976e857d4eb84a93fface84849c44bab793
Review-Url: https://codereview.chromium.org/2626013002
Cr-Commit-Position: refs/heads/master@{#42770}

R=bmeurer@chromium.org

BUG=chromium:682570

Review-Url: https://codereview.chromium.org/2664683003
Cr-Commit-Position: refs/heads/master@{#42769}

Update type of JSForInNext to say String\/Undefined.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2660543003
Cr-Commit-Position: refs/heads/master@{#42768}

R=ishell@chromium.org
BUG=chromium:686102

Review-Url: https://codereview.chromium.org/2662793002
Cr-Commit-Position: refs/heads/master@{#42767}

Review-Url: https://codereview.chromium.org/2658253002
Cr-Commit-Position: refs/heads/master@{#42766}

Where the arguments have already been inlined, we can replace these calls with a
direct call to construct. We have to make sure that the iteration over the arguments is not observable.

BUG=v8:5895

Review-Url: https://codereview.chromium.org/2659623002
Cr-Commit-Position: refs/heads/master@{#42765}

We need it to be a PropertyCell so that we can list it as a dependency for
optimised code.

Also drive-by clean up some variable names in src/isolate-inl.h.

BUG=v8:5895

Review-Url: https://codereview.chromium.org/2658573008
Cr-Commit-Position: refs/heads/master@{#42764}

R=adamk@chromium.org
BUG=v8:1569

Review-Url: https://codereview.chromium.org/2657773006
Cr-Commit-Position: refs/heads/master@{#42763}

These tests pass without further changes.

BUG=v8:5516

Review-Url: https://codereview.chromium.org/2654163008
Cr-Commit-Position: refs/heads/master@{#42762}

We shouldn't block during GC for arbitrarily long intervals.

BUG=chromium:686153,chromium:642532
R=verwaest@chromium.org,hpayer@chromium.org

Review-Url: https://codereview.chromium.org/2658313002
Cr-Commit-Position: refs/heads/master@{#42761}

emit %DebugPrint(tagged_value) instead of %GlobalPrint(tagged_value) to
avoid a CONVERT_ARG_CHECKED() failure when tagged value is not a string.

BUG=v8:5268
R=ishell@chromium.org, bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2663633002
Cr-Commit-Position: refs/heads/master@{#42760}

BUG=v8:5906
NOTRY=true
TBR=binji@chromium.org

Review-Url: https://codereview.chromium.org/2659273002
Cr-Commit-Position: refs/heads/master@{#42759}