... as opposite to a global per-isolate one.
Also streamlined multiple checks into a single acceptsPause() method.

BUG=chromium:590878

Review-Url: https://codereview.chromium.org/2925903002
Cr-Commit-Position: refs/heads/master@{#45749}

BUG=

R=bjaideep@ca.ibm.com, jyan@ca.ibm.com, joransiu@ca.ibm.com, machenbach@chromium.org, rossberg@chromium.org

Review-Url: https://codereview.chromium.org/2921293002
Cr-Commit-Position: refs/heads/master@{#45748}

... when trying to resume or step.

BUG=none

Review-Url: https://codereview.chromium.org/2923243002
Cr-Commit-Position: refs/heads/master@{#45747}

Bug: v8:6197
Change-Id: I7b9e6d0979630dfd1ce5ee7f23f715cdb2f51802
R: dgozman@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/524045Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45746}

TBR=hpayer@chromium.org
BUG=chromium:729868,chromium:729521
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_rel_ng

Review-Url: https://codereview.chromium.org/2929463002
Cr-Commit-Position: refs/heads/master@{#45745}

Properly propagate the fact that the function has a statically known name from
parser to SharedFunctionInfo objects. The empty string that has been set as
name before this CL does not help to distinguish cases like:
  var o1 = { ''(){} };
  var o1 = { [foo()](){} };
or
  var o2 = { get ''(){} };
  var o2 = { get [foo()](){} };

This is a preliminary step for using different layouts for closure objects with
and without computed names.

TBR=bmeurer@chromium.org, marja@chromium.org

Bug: v8:6459
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I10afa6f4bda7881c3714711a75f720f83c1d875d
Reviewed-on: https://chromium-review.googlesource.com/522073
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45744}

Fixes issues raised in CL https://codereview.chromium.org/2887193002.
That is:

1) Remove using mutex in Isolate::InitializeCounters().

2) Use counters_shared_.get() instead of counters_ (and hence, also
   remove field counters_).

BUG=v8:6361

Review-Url: https://codereview.chromium.org/2919953003
Cr-Commit-Position: refs/heads/master@{#45743}

Found multiple issues (added TODOs for them):
- isPaused() check is global, so one can resume from another session/context group
  without receiving 'paused' notification;
- setBreakpointsActive flag is global affecting all sessions and context groups;
- max async call stack depth is global, and should be per context group.

BUG=chromium:590878

Review-Url: https://codereview.chromium.org/2921373002
Cr-Commit-Position: refs/heads/master@{#45742}

R=marja@chromium.org
CC=adamk@chromium.org
Bug=v8:6401

Change-Id: Iac47c149d8c9136f4d0f5ef9844d2eaa95c2e497
Reviewed-on: https://chromium-review.googlesource.com/508696
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45741}

OrderedHashSet doesn't need a ::Get, so we can move it to
OrderedHashMap.

Bug: v8:5717
Change-Id: I9606d8c4608473f9daecf8a87b4dd2e3b9570246
Reviewed-on: https://chromium-review.googlesource.com/522348Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45740}

The regression is already fixed. This just adds a regression test to
ensure it will never be reintroduced.

R=ahaas@chromium.org
BUG=chromium:729991

Change-Id: I5cf960cc756cbb7723041bc06a78d6a14c66e241
Reviewed-on: https://chromium-review.googlesource.com/525538Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45739}

There's no point in using our own implemention of List for this.

Bug:v8:6325

Change-Id: Ibe9a5c65df3c9ae577ece93616bcfa47f332c212
Reviewed-on: https://chromium-review.googlesource.com/489542Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45738}

This CL implements general infrastructure for block coverage together with
initial support for if-statements.

Coverage output can be generated in lcov format by d8 as follows:

$ d8 --block-coverage --lcov=$(echo ~/simple-if.lcov) ~/simple-if.js
$ genhtml ~/simple-if.lcov -o ~/simple-if
$ chrome ~/simple-if/index.html

A high level overview of the implementation follows:

The parser now collects source ranges unconditionally for relevant AST nodes.
Memory overhead is very low and this seemed like the cleanest and simplest
alternative.

Bytecode generation uses these ranges to allocate coverage slots and insert
IncBlockCounter instructions (e.g. at the beginning of then- and else blocks
for if-statements). The slot-range mapping is generated here and passed on
through CompilationInfo, and is later accessible through the
SharedFunctionInfo.

The IncBlockCounter bytecode fetches the slot-range mapping (called
CoverageInfo) from the shared function info and simply increments the counter.
We don't collect native-context-specific counts as they are irrelevant to our
use-cases.

Coverage information is finally generated on-demand through Coverage::Collect.
The only current consumer is a d8 front-end with lcov-style output, but the
short-term goal is to expose this through the inspector protocol.

BUG=v8:6000
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_rel_ng

Review-Url: https://codereview.chromium.org/2882973002
Cr-Commit-Position: refs/heads/master@{#45737}

Revert of [inspector] Test how Profiler interacts with multiple sessions (patchset #3 id:30001 of https://codereview.chromium.org/2920313002/ )

Reason for revert:
DCHECKS triggering in debug build.

Original issue's description:
> [inspector] Test how Profiler interacts with multiple sessions
>
> BUG=chromium:590878
>
> Review-Url: https://codereview.chromium.org/2920313002
> Cr-Original-Commit-Position: refs/heads/master@{#45715}
> Committed: https://chromium.googlesource.com/v8/v8/+/754f81e20e9e7abfb3ce82e73a3389a72f4657a6
> Review-Url: https://codereview.chromium.org/2920313002
> Cr-Commit-Position: refs/heads/master@{#45717}
> Committed: https://chromium.googlesource.com/v8/v8/+/679604bdd2991a19cadf7ab5c462fc6f368f32fc

TBR=alph@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:590878

Review-Url: https://codereview.chromium.org/2926533003
Cr-Commit-Position: refs/heads/master@{#45736}

Inline SMI checks in ICs are performed with a TBZ/TBNZ instruction, which has a
32 kB range. To allow patching the SMI check, the location of the TBZ/TBNZ
instruction is stored after the call to the IC using a MOVZ instruction, in
particular using 11 bits of the immediate (so the number of instructions
between the inline data and the SMI check must be encodable in 11 bits).

To make sure we do not exceed these ranges, we need to block pool emission
between the check, the patch info, and the label the check branches to.

BUG=

Review-Url: https://codereview.chromium.org/2917403002
Cr-Commit-Position: refs/heads/master@{#45735}

This takes into account the type of the type guard when choosing
representation for a node. To make the representation changes
unambiguous, we pass the restricted type to the changer.

BUG=chromium:726554

Review-Url: https://codereview.chromium.org/2920193004
Cr-Commit-Position: refs/heads/master@{#45734}

This reverts commit 0d06e42b.

Reason for revert: clusterfuzz and canary crashes.

BUG=chromium:729209,v8:6456

Original change's description:
> [heap] Use partial free when shrinking instead of uncommitting
> 
> This fixes the counter inconsistencies while leaving the memory in an
> inaccessible state.
> 
> Bug: chromium:724947
> Change-Id: I431eb6fda84922a52dfb9380c6b482ada55bccee
> Reviewed-on: https://chromium-review.googlesource.com/519164
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Hannes Payer <hpayer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#45647}

TBR=hpayer@chromium.org,mlippautz@chromium.org
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: chromium:724947

Change-Id: I6c52b478b89a858ba984fe17f86cdf15fcfa974c
Reviewed-on: https://chromium-review.googlesource.com/525716Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45733}

Previously Ignition would collect precise Number feedback for binary
operators, but TurboFan would just ignore that and treat it the same as
NumberOrOddball. That however generates a lot of unnecessary code, plus
it defeats redundancy elimination if the same input is also used by
compare operations, which do properly distinguish feedback Number and
NumberOrOddball.

This CL adds the missing bits to connect the existing functionality
properly, i.e. adding the missing BinaryOperationHint and using the
NumberOperationHint::kNumber in the representation selection for tagged
inputs.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2923543003
Cr-Commit-Position: refs/heads/master@{#45732}

The boundary cells of the mark-bitmap can be access concurrently,
so they need to be updated with atomic CAS.

BUG=chromium:694255

Change-Id: Ibe85f00c8b4ccc61edc43b400c5b08a6d0ba620e
Reviewed-on: https://chromium-review.googlesource.com/521103
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45731}

... by using CSA::Word32BinaryNot() instead.

Change-Id: I04e2ceafc205d5667b92cfa276faed741ad3a917
Reviewed-on: https://chromium-review.googlesource.com/525695Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45730}

Change-Id: Ibd0cfc0c03b94ed6e15c6496cf16d9059447467c
Reviewed-on: https://chromium-review.googlesource.com/525472Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Daniel Ehrenberg <littledan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45729}

BUG=chromium:713699

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Ibe30fe7922a421af1596070fde4519bd2f870c4e
Reviewed-on: https://chromium-review.googlesource.com/525535
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45728}

When optimizing stores to data properties in literals, we need to first
migrate deprecated maps before we lookup the property access infos for
those.

BUG=chromium:724608
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2930433003
Cr-Commit-Position: refs/heads/master@{#45727}

BUG=chromium:728228
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_rel_ng

Review-Url: https://codereview.chromium.org/2921883002
Cr-Commit-Position: refs/heads/master@{#45726}

This reverts commit 7fa071a4.

Reason for revert: https://bugs.chromium.org/p/chromium/issues/detail?id=729482

Original change's description:
> Reland [parser] Refactor streaming scanner streams.
> 
> Unify, simplify logic, reduce UTF8 specific handling.
> 
> Intend of this is also to have stream views.
> Stream views can be used concurrently by multiple threads, but
> only one thread may fetch new data from the underlying source.
> This together with unified stream view creation is intended to be
> used for parse tasks.
> 
> BUG=v8:6093
> 
> Change-Id: I3bce48185fa2c986d16619a9a8ece3ff4c4f5e60
> Reviewed-on: https://chromium-review.googlesource.com/509489
> Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Commit-Queue: Wiktor Garbacz <wiktorg@google.com>
> Cr-Commit-Position: refs/heads/master@{#45688}

TBR=marja@chromium.org,vogelheim@chromium.org,wiktorg@google.com
# Not skipping CQ checks because original CL landed > 1 day ago.
BUG=v8:6093

Change-Id: Iefa7c43a2f6ae3a7f3ef0f77d87b6ae36ae4be99
Reviewed-on: https://chromium-review.googlesource.com/525712Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45725}

Runtime::kStringSplit's result caching is only enabled when limit equals
kMaxUInt32.

BUG=v8:6463

Review-Url: https://codereview.chromium.org/2923183002
Cr-Commit-Position: refs/heads/master@{#45724}

This avoids write barrier when writing smis to tagged fields.

This includes writing to contexts, see example below:

var f = (function() {
  var i = 0;
  return function f() {
    return i++;  // Write barrier when writing to context.
  }
})();

f(); f(); %OptimizeFunctionOnNextCall(f);
f();

Review-Url: https://codereview.chromium.org/2925793002
Cr-Commit-Position: refs/heads/master@{#45723}

Change-Id: I865d7d4d4d88997127771b10449d1b794264e252

CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_linux_noi18n_rel_ng
NOTREECHECKS=true

Change-Id: I865d7d4d4d88997127771b10449d1b794264e252
Reviewed-on: https://chromium-review.googlesource.com/524047
Commit-Queue: Daniel Ehrenberg <littledan@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45722}

For now skip WASM SIMD tests that fail when MIPS SIMD extension
is not available. Turn on these tests again when simd scalar lowering
mechanism supports all WASM SIMD operations.

Bug: 
Change-Id: I4589680147c04716ed66680aaa06639f4f2452d0
Reviewed-on: https://chromium-review.googlesource.com/524082Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Reviewed-by: Miran Karić <Miran.Karic@imgtec.com>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Cr-Commit-Position: refs/heads/master@{#45721}

Introduces ThrowReferenceErrorIfHole / ThrowSuperNotCalledIfHole 
/ ThrowSuperAlreadyCalledIfNotHole bytecodes to handle hole checks.
In the bytecode-graph builder they are handled by introducing a deopt point
instead of adding explicit control flow. JumpIfNotHole / JumpIfNotHoleConstant
bytecodes are removed since they are no longer required.


Bug: v8:4280, v8:6383
Change-Id: I58b70c556b0ffa30e41a0cd44016874c3e9c5fe1
Reviewed-on: https://chromium-review.googlesource.com/509613
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45720}

This wraps up the move to explicit APIs, i.e.
instantiateStreaming/compileStreaming.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Icc8280b2b3ad35acb90cc0beebe3acd7581179d7
Reviewed-on: https://chromium-review.googlesource.com/525141
Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45719}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/31e28f7..cd94ef8

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/6866edf..e7bf345

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

Change-Id: I0e182955a4d253843ccd0796324308d104702d1d
Reviewed-on: https://chromium-review.googlesource.com/525173Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45718}

BUG=chromium:590878

Review-Url: https://codereview.chromium.org/2920313002
Cr-Original-Commit-Position: refs/heads/master@{#45715}
Committed: https://chromium.googlesource.com/v8/v8/+/754f81e20e9e7abfb3ce82e73a3389a72f4657a6
Review-Url: https://codereview.chromium.org/2920313002
Cr-Commit-Position: refs/heads/master@{#45717}

Revert of [inspector] Test how Profiler interacts with multiple sessions (patchset #2 id:10003 of https://codereview.chromium.org/2920313002/ )

Reason for revert:
Bot failure:

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20gcc%204.8/builds/13172

Original issue's description:
> [inspector] Test how Profiler interacts with multiple sessions
>
> BUG=chromium:590878
>
> Review-Url: https://codereview.chromium.org/2920313002
> Cr-Commit-Position: refs/heads/master@{#45715}
> Committed: https://chromium.googlesource.com/v8/v8/+/754f81e20e9e7abfb3ce82e73a3389a72f4657a6

TBR=alph@chromium.org,dgozman@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:590878

Review-Url: https://codereview.chromium.org/2928493002
Cr-Commit-Position: refs/heads/master@{#45716}

BUG=chromium:590878

Review-Url: https://codereview.chromium.org/2920313002
Cr-Commit-Position: refs/heads/master@{#45715}

BUG=v8:6325

Review-Url: https://codereview.chromium.org/2904193003
Cr-Commit-Position: refs/heads/master@{#45714}

The change also moves creation of the iterator result from the parser to the bytecode generator.

Unfortunately, async generators will stay on the old scheme (try-finally around generator body) because I am not exactly sure how they work.

Review-Url: https://codereview.chromium.org/2917263002
Cr-Commit-Position: refs/heads/master@{#45713}

Capture the place we call the verifier as part of the investigation
into the referenced bug.

Bug: chromium:725559
Change-Id: I08fa91636f73994f8d77ac6ab66aa7165a12ef0b
Reviewed-on: https://chromium-review.googlesource.com/524266
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45712}

Instead of going through debugger agent, this patch implements
console.assert pause similar to debugger statement and OOM break.

New test uncovered a bug, where pause on exceptions state mix up
between different context groups. Added a TODO to fix it.

BUG=chromium:590878

Review-Url: https://codereview.chromium.org/2916363002
Cr-Commit-Position: refs/heads/master@{#45711}

Now that the BytecodeGenerator has a dedicated register holding
the generator object, BytecodeGenerator::VisitSuspend can
access the generator directly from that register. This reduces
by one the number of live registers at each suspend point.

Bug: v8:6351, v8:6460
Change-Id: I380a9d2bd8ca7eec6720e5392c1ca07dd0df0e2d
Reviewed-on: https://chromium-review.googlesource.com/522982
Commit-Queue: Adam Klein <adamk@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45710}