This way we avoid the %_IsSmi magic that is required in TurboFan to
(efficiently) check abitrary context slots for smi 0. Checking against
"the hole" is common in the AstGraphBuilder and "the hole" is also used
to mark other context slots as not initialized.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1484723003

Cr-Commit-Position: refs/heads/master@{#32407}

R=vogelheim@chromium.org
LOG=n
BUG=v8:2487

Review URL: https://codereview.chromium.org/1474353002

Cr-Commit-Position: refs/heads/master@{#32389}

Previously all contexts had a link to the global object, but what is
required in most cases (except for the global load, store and delete
case) is the native context.

This also removes the second dummy global object that was still linked
to every native context. We will add a different mechanism to ensure
that builtins do not pollute the actual global object during
bootstrapping.

Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_nosnap_rel
R=yangguo@chromium.org,mstarzinger@chromium.org

Committed: https://crrev.com/d290f204938295bfecc5c8e645ccfcff6e80ddb8
Cr-Commit-Position: refs/heads/master@{#32375}

Review URL: https://codereview.chromium.org/1480003002

Cr-Commit-Position: refs/heads/master@{#32381}

Revert of [runtime] Replace global object link with native context link in all contexts. (patchset #3 id:40001 of https://codereview.chromium.org/1480003002/ )

Reason for revert:
[Sheriff] Breaks:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap/builds/5472

Original issue's description:
> [runtime] Replace global object link with native context link in all contexts.
>
> Previously all contexts had a link to the global object, but what is
> required in most cases (except for the global load, store and delete
> case) is the native context.
>
> This also removes the second dummy global object that was still linked
> to every native context. We will add a different mechanism to ensure
> that builtins do not pollute the actual global object during
> bootstrapping.
>
> Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.
>
> R=yangguo@chromium.org
>
> Committed: https://crrev.com/d290f204938295bfecc5c8e645ccfcff6e80ddb8
> Cr-Commit-Position: refs/heads/master@{#32375}

TBR=yangguo@chromium.org,mstarzinger@chromium.org,bmeurer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1478303002

Cr-Commit-Position: refs/heads/master@{#32377}

Previously all contexts had a link to the global object, but what is
required in most cases (except for the global load, store and delete
case) is the native context.

This also removes the second dummy global object that was still linked
to every native context. We will add a different mechanism to ensure
that builtins do not pollute the actual global object during
bootstrapping.

Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1480003002

Cr-Commit-Position: refs/heads/master@{#32375}

This replaces internal GetConstructorName with toStringTag, .constructor's name
and class_name. This entirely changes how the name is computed for use in
devtools.

BUG=chromium:529177
LOG=n

Review URL: https://codereview.chromium.org/1435273002

Cr-Commit-Position: refs/heads/master@{#32374}

BUG=

Review URL: https://codereview.chromium.org/1476413002

Cr-Commit-Position: refs/heads/master@{#32369}

Moves all files related to AST and scopes into ast/,
and all files related to scanner & parser to parsing/.

Also eliminates a couple of spurious dependencies.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1481613002

Cr-Commit-Position: refs/heads/master@{#32351}

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/1478613004

Cr-Commit-Position: refs/heads/master@{#32328}

Replaces the UnboundedQueue (SP/SC) with LockedQueue (MP/MC). This is necessary
as we can have multiple tasks (on multiple platform threads) reporting code move
events.

Note that the sampling queue is not affected by this change.

BUG=chromium:524425
LOG=N

Review URL: https://codereview.chromium.org/1457483002

Cr-Commit-Position: refs/heads/master@{#32086}

1) Body descriptors moved to their own header files.
2) Missing body descriptors added.
3) Template versions of HeapObject::Iterate*() methods added.
4) Body descriptors support new kind of queries: IsValidSlot(offset) which can be used for invalid slots filtering.

This is a first step towards virtual and static visitors unification and support in-object properties in built-in (sub-)classes.

Review URL: https://codereview.chromium.org/1440243002

Cr-Commit-Position: refs/heads/master@{#31980}

The body descriptor supports different visiting policies: it could visit or skip
the code entry and it could visit or skip next function field.

BUG=v8:4531
LOG=Y

Review URL: https://codereview.chromium.org/1422773007

Cr-Commit-Position: refs/heads/master@{#31915}

Review URL: https://codereview.chromium.org/1425013006

Cr-Commit-Position: refs/heads/master@{#31819}

R=jkummerow@chromium.org, mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1406113007

Cr-Commit-Position: refs/heads/master@{#31714}

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/1424703005

Cr-Commit-Position: refs/heads/master@{#31711}

Also deprecate hidden values

BUG=none
LOG=y
R=rossberg@chromium.org,yangguo@chromium.org

Review URL: https://codereview.chromium.org/1428793002

Cr-Commit-Position: refs/heads/master@{#31658}

Symbols marked as "well-known" now return an undefined value when loaded with a failed access check, instead of throwing.

Currently, only @@isConcatSpreadable is marked as well-known, until the correct behaviour is properly specified.

BUG=v8:4289, 507553
LOG=N
R=adamk@chromium.org, jochen@chromium.org, verwaest@chromium.org

Review URL: https://codereview.chromium.org/1230793002

Cr-Commit-Position: refs/heads/master@{#31131}

Review URL: https://codereview.chromium.org/1378253002

Cr-Commit-Position: refs/heads/master@{#31060}

It was supposed to be used by the CPU profiler. But as long as
these ranges are not built when profiler is not running, once
the profiler is started there're no ranges for already compiled
functions. So basically this code never worked.

As long as now CPU profiler uses another approach this code is no
longer needed.

Review URL: https://codereview.chromium.org/1376333003

Cr-Commit-Position: refs/heads/master@{#31056}

We need to do other things with this bindings object, like store a feedback vector. Therefore, it's a good time to wrap it up in a helper class.

BUG=

Review URL: https://codereview.chromium.org/1369293003

Cr-Commit-Position: refs/heads/master@{#31044}

This enables linter checking for "readability/namespace" violations
during presubmit and instead marks the few known exceptions that we
allow explicitly.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1371083003

Cr-Commit-Position: refs/heads/master@{#31019}

BUG=v8:4444,v8:4151
LOG=N

Review URL: https://codereview.chromium.org/1371253002

Cr-Commit-Position: refs/heads/master@{#30996}

Drive-by: remove unnecessary includes.

Review URL: https://codereview.chromium.org/1356223004

Cr-Commit-Position: refs/heads/master@{#30987}