This allows the embedder to decide whether it's worthwhile to copy the
contents to avoid materializing a buffer.

BUG=v8:3996
R=dslomov@chromium.org,kbr@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/1084513002

Cr-Commit-Position: refs/heads/master@{#27782}

When debugging Handle leaks in io.js we found it very convenient to be
able to Seal some specific (root in our case) scope to prevent Handle
allocations in it, and easily find leakage.

R=yangguo
BUG=

Review URL: https://codereview.chromium.org/1079713002

Cr-Commit-Position: refs/heads/master@{#27766}

This fixes the arm(64) and mips(64) write barriers

BUG=

Review URL: https://codereview.chromium.org/1073133002

Cr-Commit-Position: refs/heads/master@{#27751}

BUG=none
R=hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1075133002

Cr-Commit-Position: refs/heads/master@{#27736}

Revert of Merge cellspace into old pointer space (patchset #8 id:180001 of https://codereview.chromium.org/1010803012/)

Reason for revert:
Causes test failures on ARM bots related to cells and write barriers.

Original issue's description:
> Merge cellspace into old pointer space
>
> BUG=
>
> Committed: https://crrev.com/4e7163ce05f135918205c7855ae60a48e5d46cc5
> Cr-Commit-Position: refs/heads/master@{#27707}

TBR=hpayer@chromium.org,balazs.kilvady@imgtec.com,yangguo@chromium.org,verwaest@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1053243003

Cr-Commit-Position: refs/heads/master@{#27711}

BUG=

Review URL: https://codereview.chromium.org/1010803012

Cr-Commit-Position: refs/heads/master@{#27707}

This reverts commit cbfcee55.

BUG=

Review URL: https://codereview.chromium.org/1051233002

Cr-Commit-Position: refs/heads/master@{#27623}

The motivation is that we prefer to avoid creating internal properties, and we have a usable field on maps ("transitions", which is not used for prototype maps).
This CL also ensures the invariant that prototype maps are never shared, even if they are in dictionary mode.

Review URL: https://codereview.chromium.org/1033653002

Cr-Commit-Position: refs/heads/master@{#27617}

Revert of make ToLocalCheck crash in release mode (patchset #1 id:1 of https://codereview.chromium.org/1043363005/)

Reason for revert:
breaks some devtools things

Original issue's description:
> make ToLocalCheck crash in release mode
>
> R=svenpanne@chromium.org
> BUG=
>
> Committed: https://crrev.com/ce7cc5119c1e031bf1eb8476fbf5e55bef738f94
> Cr-Commit-Position: refs/heads/master@{#27585}

TBR=svenpanne@chromium.org,machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1057873003

Cr-Commit-Position: refs/heads/master@{#27589}

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1043363005

Cr-Commit-Position: refs/heads/master@{#27585}

BUG=v8:3996
LOG=y
R=dslomov@chromium.org,kbr@chromium.org,hpayer@chromium.org

Review URL: https://codereview.chromium.org/1041403003

Cr-Commit-Position: refs/heads/master@{#27580}

It triggers once per context that calls observe (or attempts to access
any observation metadata, e.g. through Object.getNotifier).

Review URL: https://codereview.chromium.org/1048213002

Cr-Commit-Position: refs/heads/master@{#27557}

Embedders should use IdleNotificationDeadline()

BUG=none
R=hpayer@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/1019793008

Cr-Commit-Position: refs/heads/master@{#27550}

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1040763002

Cr-Commit-Position: refs/heads/master@{#27520}

also some drive-by handlescope fixes in api.cc

R=svenpanne@chromium.org

BUG=

Review URL: https://codereview.chromium.org/1040043002

Cr-Commit-Position: refs/heads/master@{#27510}

R=verwaest@chromium.org
BUG=468451
LOG=N

Review URL: https://codereview.chromium.org/1036743004

Cr-Commit-Position: refs/heads/master@{#27482}

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

BUG=

Review URL: https://codereview.chromium.org/998253006

Cr-Commit-Position: refs/heads/master@{#27475}

The method was deprecated a while ago: https://crrev.com/87e4bba31eabfd3b12e42b5886dc9da08d2daf13

LOG=Y
BUG=YES
API=Remove v8::Isolate::ClearInterrupt

Review URL: https://codereview.chromium.org/1032623007

Cr-Commit-Position: refs/heads/master@{#27449}

Revert of Track how many pages trigger fallback strategies in GC (patchset #2 id:20001 of https://codereview.chromium.org/1029323003/)

Reason for revert:
This seems to cause lots of crashes in layout tests debug:
../../third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp(67) : void blink::useCounterCallback(v8::Isolate *, v8::Isolate::UseCounte

http://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/2332

Original issue's description:
> Track how many pages trigger fallback strategies in GC
>
> R=hpayer@chromium.org
> BUG=
>
> Committed: https://crrev.com/bb880058f6499510cff12d98dc7d524d35d769cb
> Cr-Commit-Position: refs/heads/master@{#27421}

TBR=hpayer@chromium.org,erikcorry@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1000523003

Cr-Commit-Position: refs/heads/master@{#27427}

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1029323003

Cr-Commit-Position: refs/heads/master@{#27421}

additionally, add a drive by fix to WeakCallbackInfo

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

BUG=

Review URL: https://codereview.chromium.org/1026283004

Cr-Commit-Position: refs/heads/master@{#27407}

All users should use IdleNotificationDeadline() instead

BUG=none
R=hpayer@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/1028163003

Cr-Commit-Position: refs/heads/master@{#27386}

BUG=

Review URL: https://codereview.chromium.org/1009123003

Cr-Commit-Position: refs/heads/master@{#27371}

TBR=verwaest@chromium.org,ulan@chromium.org,ishell@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1027463002

Cr-Commit-Position: refs/heads/master@{#27323}

Only adds a counter id, does not count anything.

R=jochen@chromium.org
BUG=v8:3942
LOG=N

Review URL: https://codereview.chromium.org/1020883002

Cr-Commit-Position: refs/heads/master@{#27313}

If the Maybe is nothing or the MaybeLocal is empty, it means that the
API call either threw an exception or an exception was already pending.

In that case, the embedder needs to handle the exception or otherwise
react to the failed API call.

BUG=v8:3929
R=svenpanne@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/1022803002

Cr-Commit-Position: refs/heads/master@{#27298}

It's value is hardwired in gin[1] and is referenced in Blink[2]. Since it is treated specially by v8 debugger it should be defined in v8 API and referenced in gin and blink..

[1] https://src.chromium.org/viewvc/chrome/trunk/src/gin/public/context_holder.h?r1=239099&r2=239098&pathrev=239099
[2] https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/bindings/core/v8/V8PerContextData.cpp&q=kDebugIdIndex%20f:V8PerContextData&sq=package:chromium&type=cs

BUG=chromium:466631
LOG=Y

Review URL: https://codereview.chromium.org/1020453002

Cr-Commit-Position: refs/heads/master@{#27290}

R=verwaest@chromium.org

BUG=

Review URL: https://codereview.chromium.org/962613002

Cr-Commit-Position: refs/heads/master@{#27271}

BUG=v8:3929
LOG=n

Review URL: https://codereview.chromium.org/1015083002

Cr-Commit-Position: refs/heads/master@{#27270}

Replaces StoreGlobalCell / LoadGlobalCell with NamedField variants that use write barriers.
BUG=

Review URL: https://codereview.chromium.org/1016803002

Cr-Commit-Position: refs/heads/master@{#27269}

Some native counters (e.g. KeyedLoadGenericSlow) are referenced from stubs that are generated very early in the Isolate lifecycle before v8::Isolate::New returns. Thus counter lookup callback also needs to be installed early prior to v8::internal::Isolate::Init call. Otherwise assembler will just assume that the counter is not enabled and produce no code from IncrementCounter - because address of the counter is not yet available.

Histogram related callbacks are moved for consistency to make them able to collect samples which occur at isolate initialization time.

BUG=

Review URL: https://codereview.chromium.org/1010233002

Cr-Commit-Position: refs/heads/master@{#27262}

BUG=

Review URL: https://codereview.chromium.org/1012023002

Cr-Commit-Position: refs/heads/master@{#27259}

R=svenpanne@chromium.org
BUG=v8:3929
LOG=n

Review URL: https://codereview.chromium.org/1010803008

Cr-Commit-Position: refs/heads/master@{#27236}

R=svenpanne@chromium.org
BUG=v8:3929
LOG=n

Review URL: https://codereview.chromium.org/1017663002

Cr-Commit-Position: refs/heads/master@{#27229}

It should be possible to cast a Value to Int32 without throwing an exception
when IsInt32() is true. Same for Uint32.

BUG=chromium:462402
LOG=Y

Review URL: https://codereview.chromium.org/1003663002

Cr-Commit-Position: refs/heads/master@{#27156}

This removes the separate tracking of the pending message script,
because that script is already stored in the message object and
duplicating it in the ThreadLocalTop makes it more brittle.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/995013005

Cr-Commit-Position: refs/heads/master@{#27127}

BUG=

Review URL: https://codereview.chromium.org/993223003

Cr-Commit-Position: refs/heads/master@{#27126}

We should be able to cast a Value to Boolean when IsBoolean() is true.

Review URL: https://codereview.chromium.org/990943003

Cr-Commit-Position: refs/heads/master@{#27124}

This makes sure that the pending message location is only tracked by
the message object, as only this is saved for finally-blocks. The
location information is duplicated and becomes stale.

R=titzer@chromium.org
TEST=maeh, not so much.

Review URL: https://codereview.chromium.org/987353002

Cr-Commit-Position: refs/heads/master@{#27109}

BUG=

Review URL: https://codereview.chromium.org/993883002

Cr-Commit-Position: refs/heads/master@{#27087}