This declares v8_enable_slow_dchecks and v8_optimized_debug
as gn args. It adds support for dcheck_always_on and
debugging with v8_optimized_debug = false.

BUG=chromium:474921
NOTRY=true

Review-Url: https://codereview.chromium.org/2024833002
Cr-Commit-Position: refs/heads/master@{#36789}

BUG=v8:5015
R=jarin@chromium.org,yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2041243002
Cr-Commit-Position: refs/heads/master@{#36788}

Using the isolate to check for IsUndefined and IsTheHole is roughly at least
20% faster in the worst-case and up to a factor 2x in the best case.

BUG=

Review-Url: https://codereview.chromium.org/2031533002
Cr-Commit-Position: refs/heads/master@{#36787}

It may be that we have a feedback vector, but no literals. In this case
we can store into the OptimizedCodeMap directly instead of using a WeakCell,
because all data in the feedback vector is already held weakly.

The use of a WeakCell in the OptimizedCodeMap is only required when
there are literals which may hold maps strongly.

This is to address a performance regression caused by the creation of
a large number of WeakCells.

BUG=chromium:615831

Review-Url: https://codereview.chromium.org/2031123003
Cr-Commit-Position: refs/heads/master@{#36786}

R=jkummerow@chromium.org
BUG=chromium:595626

Review-Url: https://codereview.chromium.org/2037363002
Cr-Commit-Position: refs/heads/master@{#36785}

Port 941524f8

TEST=mjsunit/harmony/async-debug-*
BUG=

Review-Url: https://codereview.chromium.org/2045923002
Cr-Commit-Position: refs/heads/master@{#36784}

Revert of [builtins] Properly optimize TypedArray/DataView accessors. (patchset #3 id:40001 of https://codereview.chromium.org/2042013003/ )

Reason for revert:
Blink:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/7296

Original issue's description:
> [builtins] Properly optimize TypedArray/DataView accessors.
>
> The following getters were moved to the TypedArray/DataView prototype
> chain with ES2015, and hence need different treatment now:
>
> - DataView.prototype.buffer
> - DataView.prototype.byteLength
> - DataView.prototype.byteOffset
> - TypedArray.prototype.buffer
> - TypedArray.prototype.byteLength
> - TypedArray.prototype.byteOffset
> - TypedArray.prototype.length
>
> Instead of having special magic on the LoadIC in the IC system and the
> optimizing compilers, as we used to do before (and which we got rid of
> already), we just treat those as normal accessors and make them
> recognizable via the BuiltinFunctionId mechanism. This allows us to
> remove some of the additional magic from the IC subsystem, and just
> extend the BuiltinFunctionId mechanism in Crankshaft slightly to cover
> these cases too (TurboFan doesn't yet support accessors, but that will
> be fixed soonish anyways).
>
> This addresses most of the 15-20% regression we saw on the Octane
> GameBoy emulator benchmark.
>
> BUG=chromium:579905,chromium:593634,v8:4085,v8:5073
> R=yangguo@chromium.org
>
> Committed: https://crrev.com/1ef737026565ea2becc84f30cfd432e581d50c6b
> Cr-Commit-Position: refs/heads/master@{#36782}

TBR=yangguo@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:579905,chromium:593634,v8:4085,v8:5073

Review-Url: https://codereview.chromium.org/2039093005
Cr-Commit-Position: refs/heads/master@{#36783}

The following getters were moved to the TypedArray/DataView prototype
chain with ES2015, and hence need different treatment now:

- DataView.prototype.buffer
- DataView.prototype.byteLength
- DataView.prototype.byteOffset
- TypedArray.prototype.buffer
- TypedArray.prototype.byteLength
- TypedArray.prototype.byteOffset
- TypedArray.prototype.length

Instead of having special magic on the LoadIC in the IC system and the
optimizing compilers, as we used to do before (and which we got rid of
already), we just treat those as normal accessors and make them
recognizable via the BuiltinFunctionId mechanism. This allows us to
remove some of the additional magic from the IC subsystem, and just
extend the BuiltinFunctionId mechanism in Crankshaft slightly to cover
these cases too (TurboFan doesn't yet support accessors, but that will
be fixed soonish anyways).

This addresses most of the 15-20% regression we saw on the Octane
GameBoy emulator benchmark.

BUG=chromium:579905,chromium:593634,v8:4085,v8:5073
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2042013003
Cr-Commit-Position: refs/heads/master@{#36782}

This avoids the inclusion of inline headers (i.e. vm-state-inl.h in this
case) in a normal header. There are three more such violations left in
the code-base after this change.

R=verwaest@chromium.org

Review-Url: https://codereview.chromium.org/2039913002
Cr-Commit-Position: refs/heads/master@{#36781}

BUG=chromium:617524, v8:5009
LOG=Y

Review-Url: https://codereview.chromium.org/2044003003
Cr-Commit-Position: refs/heads/master@{#36780}

R=ahaas@chromium.org,bradnelson@chromium.org
BUG=chromium:617884

Review-Url: https://codereview.chromium.org/2044833002
Cr-Commit-Position: refs/heads/master@{#36779}

R=littledan@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2044803003
Cr-Commit-Position: refs/heads/master@{#36778}

BUG=chromium:474921
TBR=vogelheim@chromium.org, jochen@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2046683003
Cr-Commit-Position: refs/heads/master@{#36777}

Without the boundary prototypes we have to keep track of all shadowing properties
throughout the complete prototype chain. This contradicts the finding that most
objects have a rather large number of non-enumerable properties on the prototype
chain.

BUG=v8:705, v8:4905, v8:4706

Review-Url: https://codereview.chromium.org/2038043002
Cr-Commit-Position: refs/heads/master@{#36776}

This is a fix intended to be merged. Ideally messages.js should be rewritten.

R=bmeurer@chromium.org
BUG=chromium:617527

Review-Url: https://codereview.chromium.org/2044823002
Cr-Commit-Position: refs/heads/master@{#36775}

BUG=chromium:474921
TBR=vogelheim@chromium.org, jochen@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2041303002
Cr-Commit-Position: refs/heads/master@{#36774}

BUG=chromium:617873
NOTRY=true
TBR=jochen@chromium.org, vogelheim@chromium.org

Review-Url: https://codereview.chromium.org/2046563004
Cr-Commit-Position: refs/heads/master@{#36773}

These files somehow got added due to some rebase issues I had locally.

R=machenbach@chromium.org

Review-Url: https://codereview.chromium.org/2042203002
Cr-Commit-Position: refs/heads/master@{#36772}

Bots broke after https://codereview.chromium.org/2040913002/

BUG=chromium:599327
NOTRY=true
NOPRESUBMIT=true
TBR=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2044013002
Cr-Commit-Position: refs/heads/master@{#36771}

NOTRY=true
TBR=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2044593003
Cr-Commit-Position: refs/heads/master@{#36770}

R=bmeurer@chromium.org
BUG=v8:5071

Review URL: https://codereview.chromium.org/2045863002 .

Cr-Commit-Position: refs/heads/master@{#36769}

There's no point in trying to extract the type hints from the
fullcodegen CompareICs, BinaryOpICs and ToBooleanICs if the
feedback is not consumed (which is guarded by the flag).

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2048543002
Cr-Commit-Position: refs/heads/master@{#36768}

Rolling v8/build to 274d94c4280f7a4bd0e5747ac4a6ac5d1aedad32

Rolling v8/third_party/android_tools to 5b5f2f60b78198eaef25d442ac60f823142a8a6e

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

Review-Url: https://codereview.chromium.org/2046883002
Cr-Commit-Position: refs/heads/master@{#36767}

Revert of Promises: Make PromiseSet operation monomorphic (patchset #1 id:1 of https://codereview.chromium.org/2025073002/ )

Reason for revert:
As a side effect of calling PromiseSet from
FulfillPromise, clears the deferred symbol and the
resolve/reject callback symbols. Although this
isn't strictly necessary, not doing this seems to
result in a leak as seen in --

https://bugs.chromium.org/p/chromium/issues/detail?id=617137#c10

Original issue's description:
> Promises: Make PromiseSet operation monomorphic
>
> The PromiseSet operation is called with two types of promises
> 1) A newly created promise object with no properties
> 2) Promise object with callbacks and other properties
>
> PromiseSet is called with the first type of promise (with no
> properties) from multiple call sites. PromiseSet is called with the
> second type of promise object only from FulfillPromise. Furthermore,
> this call only sets the value and status of the promise, the rest of
> the values are reset to UNDEFINED (which isn't necessary).
>
> This patch inlines the calls to set the value and status of the
> promise in FulfillPromise, instead of calling out to PromiseSet.
>
> This patch also reduces the number of symbol lookups, as we only set
> the value and status of the promise, and don't change the callback or
> deferred symbols.
>
> This patch results in a performance improvement of 2.8% over 5 runs in
> the bluebird benchmark.
>
> BUG=v8:5046
>
> Committed: https://crrev.com/df4f8a2b9ee9e474e674301718d19b63650a0ba5
> Cr-Commit-Position: refs/heads/master@{#36688}

TBR=littledan@chromium.org,adamk@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=v8:5046

Review-Url: https://codereview.chromium.org/2047553002
Cr-Commit-Position: refs/heads/master@{#36766}

When |ResolvePromise| is resolved with a promise that is
already fulfilled or resolved, we can short circuit the
promise resolution procedure by directly looking up the
result from the promise. We save creating two closures, enqueuing in
the promise queue, and running through PromiseThen.

This patch uses IsPromise to check if the |resolution| object is a native
promise and also checks if |resolution.then| hasn't been monkey
patched.

This patch adds some redundant code from PromiseThen like setting
the promiseHasHandlerSymbol and calling PromiseRevokeReject call,
which would've been taken care of by PromiseThen in the old code path.

This patch results in a 13.8% improvement(over 5 runs) in the bluebird
benchmarks.

BUG=v8:5046

Review-Url: https://codereview.chromium.org/2028253004
Cr-Commit-Position: refs/heads/master@{#36765}

Revert of [stubs] Enable TurboFan LoadIC dispatcher stub. (patchset #1 id:1 of https://codereview.chromium.org/2033943005/ )

Reason for revert:
Fails cctest consistently on Linux nosnap debug:

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap%20-%20debug/builds/7185
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap%20-%20debug/builds/7186
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap%20-%20debug/builds/7187

Original issue's description:
> [stubs] Enable TurboFan LoadIC dispatcher stub.
>
> Committed: https://crrev.com/46a9322e88de037598cfd1090285375d97b11db2
> Cr-Commit-Position: refs/heads/master@{#36760}

TBR=verwaest@chromium.org,ishell@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2042873002
Cr-Commit-Position: refs/heads/master@{#36764}

As a first step I uncommit the memory on the main thread. Also to measure impact and stability of that optimization. In a follow-up CL, the uncommitting should be moved on the concurrent thread.

BUG=

Review-Url: https://codereview.chromium.org/2032393002
Cr-Commit-Position: refs/heads/master@{#36763}

We should use both the int value as well as the reloc info mode for the
key of a relocatable int{32|64}.

BUG=

Review-Url: https://codereview.chromium.org/2039023002
Cr-Commit-Position: refs/heads/master@{#36762}

This cl sketches an api for incremental wrapper tracing, but still uses the api
in the stop-the-world fashion. Responsibility to maintain a marking deque is
transfered to the embedder. V8 will still collect wrapper internal fields, but
will send them to the embedder after each incremental gc task. Wrappers must be
sent at latest by the time next oilpan gc runs - so blink can keep all
discovered wrappables alive.

The old api will be cleared after this cl and corresponding blink cl land.

Comments are very welcomed :)

LOG=no
BUG=468240

Review-Url: https://codereview.chromium.org/2032213003
Cr-Commit-Position: refs/heads/master@{#36761}

Review-Url: https://codereview.chromium.org/2033943005
Cr-Commit-Position: refs/heads/master@{#36760}

Port 8d90210a

BUG=

Review-Url: https://codereview.chromium.org/2045553002
Cr-Commit-Position: refs/heads/master@{#36759}

Revert of Provide a tagged allocation top pointer. (patchset #5 id:80001 of https://codereview.chromium.org/2028633002/ )

Reason for revert:
d8 segfaults on some benchmarks on ia32. Investigating.

Original issue's description:
> Provide a tagged allocation top pointer.
>
> Taking over http://crrev.com/1924223002.
>
> BUG=chromium:606711
> LOG=N
>
> Committed: https://crrev.com/f42c9e93c80fdf57e8f92bb87f6ed927d0ae4028
> Committed: https://crrev.com/c99caf307ba3bb1b1cf08bf4172f503754c41341
> Cr-Original-Commit-Position: refs/heads/master@{#36633}
> Cr-Commit-Position: refs/heads/master@{#36742}

TBR=bmeurer@chromium.org,hpayer@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:606711

Review-Url: https://codereview.chromium.org/2035413003
Cr-Commit-Position: refs/heads/master@{#36758}

Prior to this change, both 0 and 1 as RNG seed would result in the same
internal state. state0 and state1 cannot both be zero, but murmur hash
maps 0 back to 0.

R=cbruni@chromium.org
BUG=v8:5069

Review-Url: https://codereview.chromium.org/2040953002
Cr-Commit-Position: refs/heads/master@{#36757}

Improve CheckedLoad and Store bounds checking for arrays with power of two
length.

BUG=

Review-Url: https://codereview.chromium.org/2043663002
Cr-Commit-Position: refs/heads/master@{#36756}

R=rossberg,adamk
BUG=chromium:616386

Review-Url: https://codereview.chromium.org/2042793002
Cr-Commit-Position: refs/heads/master@{#36755}

[stubs] Introducing LoadICTFStub and LoadICTrampolineTFStub and a switch to enable them instead of respective platform stubs.

The stubs do not increase respective counters as they are in the snapshot and --native-code-counters is off during snapshot creation anyway.

Review-Url: https://codereview.chromium.org/2031753003
Cr-Commit-Position: refs/heads/master@{#36754}

This switches a few underscores to dashes to match the infra-
side definitions.

BUG=chromium:474921
TBR=vogelheim@chromium.org, jochen@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2045543002
Cr-Commit-Position: refs/heads/master@{#36753}

This allows the header in question to be included without including any
other header files. This is step towards factory.h being self-contained.

R=clemensh@chromium.org

Review-Url: https://codereview.chromium.org/2043723002
Cr-Commit-Position: refs/heads/master@{#36752}

Since the generic GetCallingContext is deprecated, but there's still the
use case for the debugger to get the currently debugged context while in
the debug context, add a convenience API for it.

Note that EventDetails already exposes this context, but the embedder
might not necessarily have the EventDetails around.

R=verwaest@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2040853003
Cr-Commit-Position: refs/heads/master@{#36751}

Port 8d90210a

R=yangguo@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4483
LOG=N

Review-Url: https://codereview.chromium.org/2040803003
Cr-Commit-Position: refs/heads/master@{#36750}