This patch results in a 11% improvement over 5 runs in the
bluebird benchmark.

BUG=v8:5343,v8:5046
TBR=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2406343002
Cr-Commit-Position: refs/heads/master@{#40239}

This incorporates recent feedback:
- simpler deserialization API by dropping the std::unique_ptr.
The only purpose there was communicating to the caller that they
own the buffer, and that the deserializer won't delete it. The new
design communicates that through a naming choice.
- renamed *UncompiledBytes to *WasmWireBytes

BUG=

Review-Url: https://codereview.chromium.org/2411263004
Cr-Commit-Position: refs/heads/master@{#40238}

Review-Url: https://codereview.chromium.org/2404663002
Cr-Commit-Position: refs/heads/master@{#40237}

Review-Url: https://codereview.chromium.org/2405173005
Cr-Commit-Position: refs/heads/master@{#40236}

BUG=428099

Review-Url: https://codereview.chromium.org/2404283002
Cr-Commit-Position: refs/heads/master@{#40235}

The over allocated memory of fixed array type didn't equal to the sum of all
fixed array sub types previously, this patch adds over allocated memory of fixed
array sub types to fixed array type when we record fixed array sub type stats.

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2410083003
Cr-Commit-Position: refs/heads/master@{#40234}

By defining functions with namespace prefix, the compiler checks that
they were previously declared, and checks that the signature matches.
I stumbled across this several times when changing the interface of a
function in the header.
With this change you get a compile error right away instead of a linker
error in the very end.

This change also revealed two functions which could be placed in an
anonymous namespace, saving 5.5kB program size in Debug build, 2.3kB in
Optdebug and 0.3kB in Release. It's also opening more options for
compiler optimizations, as the functions now have internal linkage.

R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2415603002
Cr-Commit-Position: refs/heads/master@{#40233}

The state sampling was implemented in chrome, we had an interface for it
V8 but it was not implemented yet.
The chrome version version has been removed in
https://codereview.chromium.org/2406703002/
Therefore following up with its removal in V8 as well.

This CL can land independent of the Chromium related CL.

R=primiano@chromium.org,alph@chromium.org

Review-Url: https://codereview.chromium.org/2410523002
Cr-Commit-Position: refs/heads/master@{#40232}

BUG=v8:5501

Review-Url: https://codereview.chromium.org/2410413003
Cr-Commit-Position: refs/heads/master@{#40231}

Imported and defined globals share an index space, but previously the decoder clobbered the imported global indices with the defined globals.

BUG=none

Review-Url: https://codereview.chromium.org/2410953003
Cr-Commit-Position: refs/heads/master@{#40230}

This CL is in preparation for the upcoming port of
RegExp.prototype.replace, which will need use these methods in
runtime-regexp.cc. Moving them in advance makes that diff less noisy.

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2398413002
Cr-Commit-Position: refs/heads/master@{#40229}

Port c15c5827

Original commit message:

    This is the next step to unify the Call/Construct feedback collection
    and prepare it to be able to collect SharedFunctionInfo feedback. This
    also reduces the CallICStub overhead quite a bit since we only need one
    stub per mode (and tail call mode), not also one per call arity.

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

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2415583002
Cr-Commit-Position: refs/heads/master@{#40228}

BUG=v8:5501

Review-Url: https://codereview.chromium.org/2413673002
Cr-Commit-Position: refs/heads/master@{#40227}

Unittests for protocol parser are located in core/inspector in blink and separate test runner for inspector tests was added.

BUG=chromium:635948
R=dgozman@chromium.org,yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2376173002
Cr-Commit-Position: refs/heads/master@{#40226}

This location is used at least in Chromium.

BUG=chromium:635948
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2405303002
Cr-Commit-Position: refs/heads/master@{#40225}

R=clemensh@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2415533003
Cr-Commit-Position: refs/heads/master@{#40224}

... because the latter automatically respects the desired calling convention.

BUG=v8:5408

Review-Url: https://codereview.chromium.org/2391043005
Cr-Commit-Position: refs/heads/master@{#40223}

Thus the parameter indices defined in respective CallInterfaceDescriptor can
be used for querying parameters.

BUG=

Review-Url: https://codereview.chromium.org/2389133007
Cr-Commit-Position: refs/heads/master@{#40222}

BUG=chromium:648568

Review-Url: https://codereview.chromium.org/2403423007
Cr-Commit-Position: refs/heads/master@{#40221}

Review-Url: https://codereview.chromium.org/2412613004
Cr-Commit-Position: refs/heads/master@{#40220}

Review-Url: https://codereview.chromium.org/2411793004
Cr-Commit-Position: refs/heads/master@{#40219}

The race can happen if:
1) Fixed array A is right before object B in new space
2) A slot in object C located in old space points to object B (old to new remembered set entry is created)
3) Object C becomes unreachable which held the only reference to object B which also becomes unreachable
4) Fixed array A gets right trimmed
5) The sweeper will sweep the last word of object A and object B. It will write the free space map into the last word of object A and a size field in the first word of object B.
6) Pointer updating may observe the size field now because the recored slot points to the start of object B and will confuse it with a forwarding pointer.

Note a similar race may happen with left trimming. Array A points to its backing store, the backing store gets left trimmed by 1 element, and array A dies.
BUG=

Review-Url: https://codereview.chromium.org/2416563002
Cr-Commit-Position: refs/heads/master@{#40218}

This should restore the codeload regression when FLAG_lazy_inner_functions is turned off

BUG=v8:5501

Review-Url: https://codereview.chromium.org/2412483005
Cr-Commit-Position: refs/heads/master@{#40217}

[stubs] Drop StoreICStub and StoreICTrampolineStub (the non-TurboFan implementations of StoreIC dispatchers).

Because of the planned improvements of IC system it does not make sense to
keep the old platform version of the stub around.

Review-Url: https://codereview.chromium.org/2413653003
Cr-Commit-Position: refs/heads/master@{#40216}

If we're parsing a script or based on a SharedFunctionInfo marked as toplevel, we can implicitly set it. Only manually set in the background parsing task where we manually set up ParseInfo.

BUG=v8:5501

Review-Url: https://codereview.chromium.org/2405263003
Cr-Commit-Position: refs/heads/master@{#40215}

This is allocating registers in the function for all inner contexts that can be active in that function, so that nested blocks always have O(1) access to all outer contexts. However, currently it's always walking into nested functions, overallocating the number of registers, causing additional register pressure.

BUG=v8:5484

Review-Url: https://codereview.chromium.org/2408303003
Cr-Commit-Position: refs/heads/master@{#40214}

This CL also introduces a NoBarrierAtomicValue with NoBarrier accessors.

BUG=chromium:648568

Review-Url: https://codereview.chromium.org/2408233004
Cr-Commit-Position: refs/heads/master@{#40213}

Review-Url: https://codereview.chromium.org/2412493006
Cr-Commit-Position: refs/heads/master@{#40212}

[stubs] Drop LoadICStub and LoadICTrampolineStub (the non-TurboFan implementations of LoadIC dispatchers).

Because of the planned improvements of IC system it does not make sense to
keep the old platform version of the stub around.

Review-Url: https://codereview.chromium.org/2418513002
Cr-Commit-Position: refs/heads/master@{#40211}

We want to extend the use of this code dependency, so the name does no
longer reflect the purpose.

R=ishell@chromium.org

Review-Url: https://codereview.chromium.org/2410293003
Cr-Commit-Position: refs/heads/master@{#40210}

WordIsSmi, by itself, is not that descriptive, as it just ands a word with the heap object tag. With this change, the MachineGraphVerifier can check that the input to TaggedIsSmi actually has a tagged representation.

This CL also introduces a few bitcast operators in the Smi* macros in the CodeStubAssembler.

R=bmeurer@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2407303002
Cr-Commit-Position: refs/heads/master@{#40209}

BUG=v8:5412

Review-Url: https://codereview.chromium.org/2409133002
Cr-Commit-Position: refs/heads/master@{#40208}

The only way to get a minus zero result from subtraction is
(-0) - (+0) = -0, hence checking for minus zero on the RHS is
redundant. This is causing some unnecessary deoptimisations
in Box2D from Octane on 32-bit platforms.

BUG=

Review-Url: https://codereview.chromium.org/2410883003
Cr-Commit-Position: refs/heads/master@{#40207}

This is the next step to unify the Call/Construct feedback collection
and prepare it to be able to collect SharedFunctionInfo feedback. This
also reduces the CallICStub overhead quite a bit since we only need one
stub per mode (and tail call mode), not also one per call arity.

R=mvstanton@chromium.org
BUG=v8:2206
NOTRY=true

Review-Url: https://codereview.chromium.org/2412453005
Cr-Commit-Position: refs/heads/master@{#40206}

For the asm.js to WASM pipeline, the current stack traces only show
low-level WASM information.
This CL maps this back to asm.js source positions.
It does so by attaching the asm.js source Script to the compiled WASM
module, and emitting a delta-encoded table which maps from WASM byte
offsets to positions within that Script. As asm.js code does not throw
exceptions, we only store a mapping for call instructions.

The new AsmJsWasmStackFrame implementation inherits from
WasmStackFrame, but contains the logic to provide the source script and
the position inside of it.
What is still missing is the JSFunction object returned by
CallSite.getFunction(). We currently return null.

R=jgruber@chromium.org, titzer@chromium.org
BUG=v8:4203

Review-Url: https://codereview.chromium.org/2404253002
Cr-Commit-Position: refs/heads/master@{#40205}

If passing <nullptr, 0> to the decoder and trying to decode something,
it correctly detects the error and sets an error message, but still
returns true on ok(), and returns a valid result.
I triggered this error by passing a null Vector, returned by FindSection(), to
the decoder.

R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2410913002
Cr-Commit-Position: refs/heads/master@{#40204}

Revert of [CQ] Remove experimental bot temporarily. (patchset #1 id:1 of https://codereview.chromium.org/2411283002/ )

Reason for revert:
Root cause fixed.

Original issue's description:
> [CQ] Remove experimental bot temporarily.
>
> BUG=chromium:655033,v8:5502
> NOTRY=true
> NOPRESUBMIT=true
> TBR=tandrii@chromium.org
>
> Committed: https://crrev.com/f994fcb10ed9ebc09a3544221db8d2fc121c6e98
> Cr-Commit-Position: refs/heads/master@{#40193}

TBR=tandrii@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:655033,v8:5502

Review-Url: https://codereview.chromium.org/2412073002
Cr-Commit-Position: refs/heads/master@{#40203}

BUG=chromium:645438

Review-Url: https://codereview.chromium.org/2412853002
Cr-Commit-Position: refs/heads/master@{#40202}

We accidently dropped the effect on the floor that we have for the
polymorphic map check in case of array elements access.

BUG=chromium:655004
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2411273002
Cr-Commit-Position: refs/heads/master@{#40201}

Revert of [inspector] fix timestamp formatting with non C locales (patchset #7 id:120001 of https://codereview.chromium.org/2410933002/ )

Reason for revert:
Breaks layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/10548

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

Original issue's description:
> [inspector] fix timestamp formatting with non C locales
>
> If current locale has "," as decimal separator then message for consoleAPICalled will be corrupted.
>
> BUG=chromium:653424
> R=dgozman@chromium.org
>
> Committed: https://crrev.com/dde5ef75cbac1eb7e2dae59b246e4a0d0ba6a0f4
> Cr-Commit-Position: refs/heads/master@{#40190}

TBR=dgozman@chromium.org,kozyatinskiy@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:653424

Review-Url: https://codereview.chromium.org/2419453002
Cr-Commit-Position: refs/heads/master@{#40200}