New code should use nullptr instead of NULL.

This patch updates existing use of NULL to nullptr where applicable,
making the code base more consistent.

BUG=v8:6928,v8:6921

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng;master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: I4687f5b96fcfd88b41fa970a2b937b4f6538777c
Reviewed-on: https://chromium-review.googlesource.com/718338
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48557}

Previously, Date.toString() and friends were completely
implementation-defined. However, they actually seemed to match
each other's behavior with the exception of how years less than
1000 are formatted. The rough consensus among browsers seemed
to be %04d, so this was standardized at TC39 [1]. V8 previously
used %4d (it was the only one to do so); this patch adopts
the new standard.

[1] https://github.com/tc39/ecma262/commit/5d4acf3377e1b0ad4a4660c57108db1b28ef20ff

Bug: v8:6076
Change-Id: I8c795a4e1b71187ad7c24a1aee8d7d66719a2586
Reviewed-on: https://chromium-review.googlesource.com/536733
Commit-Queue: Daniel Ehrenberg <littledan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46037}

This is in preparation for linking the former only into mksnapshot.
Just shuffling code around, no changes in functionality.

BUG=v8:6055

Review-Url: https://codereview.chromium.org/2752143004
Cr-Commit-Position: refs/heads/master@{#43858}

Review-Url: https://codereview.chromium.org/2734323004
Cr-Commit-Position: refs/heads/master@{#43695}

BUG=v8:5294

Change-Id: If45f25aae8de526027b7851cb4efe0ccf4a7c4b1
Reviewed-on: https://chromium-review.googlesource.com/444226
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43388}

This should improve readability, code generation, and ensure that
we verify such locations are never reached.

BUG=

Review-Url: https://codereview.chromium.org/2705163005
Cr-Commit-Position: refs/heads/master@{#43367}

BUG=

Change-Id: Ifc441739ef730a0b2278be0b662413c223631a72
Reviewed-on: https://chromium-review.googlesource.com/444190Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43288}

After https://github.com/tc39/ecma262/pull/642, Date.UTC no longer requires
the month argument to be specified. The spec provides 0 as its default value.

This CL updates the builtins-date.cc code to reflect that and drops the test
suppression for test262/built-ins/Date/UTC/return-value.

BUG=v8:5534

Review-Url: https://codereview.chromium.org/2689173003
Cr-Commit-Position: refs/heads/master@{#43193}

Migrate Date.prototype.valueOf and Date.prototype[ @@toPrimitive ]
to use the CodeStubAssembler, to avoid going through C++ always
when comparing or subtracting two dates.

R=epertoso@chromium.org

Review-Url: https://codereview.chromium.org/2608143003
Cr-Commit-Position: refs/heads/master@{#42030}

Many websites use simple calls to String.prototype.indexOf with either a
one character ASCII needle or needles bigger than the search string. This
CL adds a TFJ builtin for these simple cases, giving up to factor 5 speedup.

Drive-by-fix: Add default Object type to Arguments.at

BUG=

Review-Url: https://codereview.chromium.org/2539093002
Cr-Commit-Position: refs/heads/master@{#41760}

... and fix the inconsistencies.

BUG=

Review-Url: https://codereview.chromium.org/2573573004
Cr-Commit-Position: refs/heads/master@{#41690}

BUG=

Review-Url: https://codereview.chromium.org/2558443002
Cr-Commit-Position: refs/heads/master@{#41511}

This is in preparation for introducing more specialized
CodeStubAssembler subclasses. The state object can be handed
around, while the Assembler instances are temporary-scoped.

BUG=v8:5628

Original review: https://codereview.chromium.org/2498073002/

Review-Url: https://codereview.chromium.org/2502293002
Cr-Commit-Position: refs/heads/master@{#41028}

Revert of [refactoring] Split CodeAssemblerState out of CodeAssembler (patchset #8 id:140001 of https://codereview.chromium.org/2498073002/ )

Reason for revert:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20shared doesn't want to compile. Missing export annotation?

Original issue's description:
> [refactoring] Split CodeAssemblerState out of CodeAssembler
>
> This is in preparation for introducing more specialized
> CodeStubAssembler subclasses. The state object can be handed
> around, while the Assembler instances are temporary-scoped.
>
> BUG=v8:5628

TBR=ishell@chromium.org,mstarzinger@chromium.org,jkummerow@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5628

Review-Url: https://codereview.chromium.org/2504913002
Cr-Commit-Position: refs/heads/master@{#41018}

This is in preparation for introducing more specialized
CodeStubAssembler subclasses. The state object can be handed
around, while the Assembler instances are temporary-scoped.

BUG=v8:5628

Review-Url: https://codereview.chromium.org/2498073002
Cr-Commit-Position: refs/heads/master@{#41015}

It's always JSFunction.

R=bmeurer@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2422573002
Cr-Commit-Position: refs/heads/master@{#40301}

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}

Migrate the platform DatePrototype_GetField (and all wrappers) to
TurboFan.

BUG=v8:5049

Review-Url: https://codereview.chromium.org/2263533002
Cr-Commit-Position: refs/heads/master@{#39438}

R=yangguo@chromium.org
BUG=v8:5197

Review-Url: https://codereview.chromium.org/2165593002
Cr-Commit-Position: refs/heads/master@{#37885}