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}

[interpreter] Avoid allocation of temporary array of Nodes when generating dispatch to bytecode handler.

BUG=

Review-Url: https://codereview.chromium.org/2576213007
Cr-Commit-Position: refs/heads/master@{#41759}

This allows to share source dumping infrastructure between CS and TF and opens a possibility for external tools like IRHydra to perform deoptimization to source mapping for TF generated code based on --trace-deopt --print-opt-code --code-comments output.

This CL also restores an old TraceInlinedFunction behavior which was lost during source positions refactoring - originally TraceInlinedFunction dumped source code only once per-SFI to avoid large traces whenever some helper function is inlined multiple times.

This CL also adds --print-opt-source flag that would in the future replace obsolete --hydrogen-track-positions.

BUG=

Review-Url: https://codereview.chromium.org/2575703003
Cr-Commit-Position: refs/heads/master@{#41758}

BUG=

Review-Url: https://codereview.chromium.org/2579983002
Cr-Commit-Position: refs/heads/master@{#41757}

If a context snapshot includes the global proxy constructor function, we
expect the incoming global proxy to have the correct instance size so
that we can reinitialize it with said constructor. However, when the
bootstrapper allocates a new global proxy, we need to know the expected
size.

We solve this by storing the size on the to-be-serialized isolate.

R=jochen@chromium.org, peria@chromium.org
BUG=chromium:617892

Review-Url: https://codereview.chromium.org/2585693002
Cr-Commit-Position: refs/heads/master@{#41756}

.. by using variadic templates in CodeAssembler.

BUG=

Review-Url: https://codereview.chromium.org/2584743003
Cr-Commit-Position: refs/heads/master@{#41755}

BUG=v8:5394
R=mstarzinger@chromium.org,rmcilroy@chromium.org

Review-Url: https://codereview.chromium.org/2579973002
Cr-Commit-Position: refs/heads/master@{#41754}

... by using variadic templates in CodeAssembler.

BUG=

Review-Url: https://codereview.chromium.org/2579163003
Cr-Commit-Position: refs/heads/master@{#41753}

This introduces an explicit struct for the communication channel between
the {ArrayLiteral} AST node and the corresponding runtime methods. Those
methods take a pair of {ElementsKind} as well as an array (can either be
a FixedArray or a FixedDoubleArray) of constant values.

For bonus points it also reduces the size of the involved heap object by
one word (i.e. length field of FixedArray not needed anymore).

R=mvstanton@chromium.org

Review-Url: https://codereview.chromium.org/2581683003
Cr-Commit-Position: refs/heads/master@{#41752}

When mark-shared-funtion-for-tier-up is enabled, a function could be marked for
optimization, then the baseline (FCG) code is flushed by the GC. The next time
the function is executed, we shouldn't optimize the code if there isn't
baseline code.

BUG=chromium:673242

Review-Url: https://codereview.chromium.org/2575333003
Cr-Commit-Position: refs/heads/master@{#41751}

... as they are no longer needed.

BUG=

Review-Url: https://codereview.chromium.org/2582593005
Cr-Commit-Position: refs/heads/master@{#41750}

.. by using variadic templates in CodeAssembler.

BUG=

Review-Url: https://codereview.chromium.org/2577913003
Cr-Commit-Position: refs/heads/master@{#41749}

Revert of [turbofan] Remove value numbering from late optimization pass. (patchset #1 id:1 of https://codereview.chromium.org/2570813002/ )

Reason for revert:
Tanks Kraken astar benchmark.

Original issue's description:
> [turbofan] Remove value numbering from late optimization pass.
>
> Committed: https://crrev.com/e32535af5a5f4776a58ef434ea77d56528ded427
> Cr-Commit-Position: refs/heads/master@{#41672}

TBR=bmeurer@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review-Url: https://codereview.chromium.org/2579273002
Cr-Commit-Position: refs/heads/master@{#41748}

The WasmRunner now always holds a TestingModule, and allows to add
several functions to it. The prepares a change to always run wasm code
with a full module behind it, removing the special handling for "no wasm
instance" at runtime (http://crrev.com/2551053002).
This CL here also templatizes the WasmRunner such that the Call method must
be called with the same signature specified for the WasmRunner. This
already catched several mismatches there.

R=titzer@chromium.org, ahaas@chromium.org
BUG=v8:5620

Review-Url: https://codereview.chromium.org/2551043002
Cr-Original-Commit-Position: refs/heads/master@{#41728}
Committed: https://chromium.googlesource.com/v8/v8/+/2ff59062314e9b86bcc28dfaa53cedf2d98e3a13
Review-Url: https://codereview.chromium.org/2551043002
Cr-Commit-Position: refs/heads/master@{#41747}

.. by using variadic templates in CodeAssembler.

BUG=

Review-Url: https://codereview.chromium.org/2577013003
Cr-Commit-Position: refs/heads/master@{#41746}

TC39 decided at their last meeting to remove this feature.

R=adamk@chromium.org
TBR=ulan@chromium.org
BUG=v8:1569

Review-Url: https://codereview.chromium.org/2578053003
Cr-Commit-Position: refs/heads/master@{#41745}

Revert of Disallow passing a SharedArrayBuffer in the transfer list. (patchset #4 id:60001 of https://codereview.chromium.org/2570433005/ )

Reason for revert:
Breaks layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/12098

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

Original issue's description:
> Disallow passing a SharedArrayBuffer in the transfer list.
>
> This behavior changed recently. SharedArrayBuffers should not be put in the
> transfer list, because they are not detached, and that is the meaning of being
> in the transfer list.
>
> This is the V8 side of the change, the Blink side will come next.
>
> Review-Url: https://codereview.chromium.org/2570433005
> Cr-Commit-Position: refs/heads/master@{#41740}
> Committed: https://chromium.googlesource.com/v8/v8/+/1c5e1504e0305363cd262f1706cbd63f9a62ae46

TBR=jbroman@chromium.org,jkummerow@chromium.org,binji@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/2579963002
Cr-Commit-Position: refs/heads/master@{#41744}

BUG=643595

Review-Url: https://codereview.chromium.org/2582583002
Cr-Original-Commit-Position: refs/heads/master@{#41738}
Committed: https://chromium.googlesource.com/v8/v8/+/cb433bed0b940a7073b5215e6684b940eec54edd
Review-Url: https://codereview.chromium.org/2582583002
Cr-Commit-Position: refs/heads/master@{#41743}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/d4ca00b..3983535

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/ab73453..eb5390d

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

Review-Url: https://codereview.chromium.org/2578413002
Cr-Commit-Position: refs/heads/master@{#41742}

Add vfa/vfs/vfm/vfd support on s390

R=joransiu@ca.ibm.com, bjaideep@ca.ibm.com, danno@chromium.org, jkummerow@chromium.org, jochen@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2582683002
Cr-Commit-Position: refs/heads/master@{#41741}

This behavior changed recently. SharedArrayBuffers should not be put in the
transfer list, because they are not detached, and that is the meaning of being
in the transfer list.

This is the V8 side of the change, the Blink side will come next.

Review-Url: https://codereview.chromium.org/2570433005
Cr-Commit-Position: refs/heads/master@{#41740}

Revert of [wasm] simpler detection if we compiled asm-wasm (patchset #1 id:1 of https://codereview.chromium.org/2582583002/ )

Reason for revert:
https://build.chromium.org/p/client.v8/builders/V8%20Mac%20GC%20Stress/builds/10384

Original issue's description:
> [wasm] simpler detection if we compiled asm-wasm
>
> BUG=643595
>
> Review-Url: https://codereview.chromium.org/2582583002
> Cr-Commit-Position: refs/heads/master@{#41738}
> Committed: https://chromium.googlesource.com/v8/v8/+/cb433bed0b940a7073b5215e6684b940eec54edd

TBR=yangguo@chromium.org,bradnelson@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=643595

Review-Url: https://codereview.chromium.org/2582623002
Cr-Commit-Position: refs/heads/master@{#41739}

BUG=643595

Review-Url: https://codereview.chromium.org/2582583002
Cr-Commit-Position: refs/heads/master@{#41738}

- Adds NEON instructions to assembler, disassembler, simulator.
- Adds ExtractLane, ReplaceLane functions to macro assembler.

LOG=N
BUG=v8:4124

Review-Url: https://codereview.chromium.org/2546933002
Cr-Commit-Position: refs/heads/master@{#41737}

This should speed up trace generation for cpu profile as it eliminates
creation of temporary std::string objects.

Review-Url: https://codereview.chromium.org/2555043003
Cr-Commit-Position: refs/heads/master@{#41736}

Original commit message:
[wasm] Introduce the TrapIf and TrapUnless operators to generate trap code.

Some instructions in WebAssembly trap for some inputs, which means that the
execution is terminated and (at least at the moment) a JavaScript exception is
thrown. Examples for traps are out-of-bounds memory accesses, or integer
divisions by zero.

Without the TrapIf and TrapUnless operators trap check in WebAssembly introduces 5
TurboFan nodes (branch, if_true, if_false, trap-reason constant, trap-position
constant), in addition to the trap condition itself. Additionally, each
WebAssembly function has four TurboFan nodes (merge, effect_phi, 2 phis) whose
number of inputs is linear to the number of trap checks in the function.
Especially for functions with high numbers of trap checks we observe a
significant slowdown in compilation time, down to 0.22 MiB/s in the sqlite
benchmark instead of the average of 3 MiB/s in other benchmarks. By introducing
a TrapIf common operator only a single node is necessary per trap check, in
addition to the trap condition. Also the nodes which are shared between trap
checks (merge, effect_phi, 2 phis) would disappear. First measurements suggest a
speedup of 30-50% on average.

This CL only implements TrapIf and TrapUnless on x64. The implementation is also
hidden behind the --wasm-trap-if flag.

Please take a special look at how the source position is transfered from the
instruction selector to the code generator, and at the context that is used for
the runtime call.

R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2571813002
Cr-Commit-Position: refs/heads/master@{#41735}

Original CL description:
> Store SharedFunctionInfos of a Script in a FixedArray indexed by their ID
>
> Now that SharedFunctionInfos have a unique ID (and the IDs are dense),
> we can use them as an index into an array, instead of using a
> WeakFixedArray where we have to do a linear scan.
>
> Hooking up liveedit is a bit more involved, see
> https://docs.google.com/presentation/d/1FtNa3U7WsF5bPhY9uGoJG5Y9hnz5VBDabfOWpb4unWI/edit
> for an overview
>
> BUG=v8:5589
> R=verwaest@chromium.org,jgruber@chromium.org
>
> Review-Url: https://codereview.chromium.org/2547483002

BUG=v8:5589
TBR=verwaest@chromium.org,jgruber@chromium.org

Review-Url: https://codereview.chromium.org/2577063002
Cr-Commit-Position: refs/heads/master@{#41734}

.. by using variadic templates in CodeAssembler and RawMachineAssembler.

BUG=

Review-Url: https://codereview.chromium.org/2580823002
Cr-Commit-Position: refs/heads/master@{#41733}

Revert of [wasm] Make WasmRunner the central test structure (patchset #5 id:80001 of https://codereview.chromium.org/2551043002/ )

Reason for revert:
Win64 dbg failures

Original issue's description:
> [wasm] Make WasmRunner the central test structure
>
> The WasmRunner now always holds a TestingModule, and allows to add
> several functions to it. The prepares a change to always run wasm code
> with a full module behind it, removing the special handling for "no wasm
> instance" at runtime (http://crrev.com/2551053002).
> This CL here also templatizes the WasmRunner such that the Call method must
> be called with the same signature specified for the WasmRunner. This
> already catched several mismatches there.
>
> R=titzer@chromium.org, ahaas@chromium.org
> BUG=v8:5620
>
> Review-Url: https://codereview.chromium.org/2551043002
> Cr-Commit-Position: refs/heads/master@{#41728}
> Committed: https://chromium.googlesource.com/v8/v8/+/2ff59062314e9b86bcc28dfaa53cedf2d98e3a13

TBR=ahaas@chromium.org,titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5620

Review-Url: https://codereview.chromium.org/2583543002
Cr-Commit-Position: refs/heads/master@{#41732}

Instead of unconditionally setting maybe_assigned for parameters, treat
parameters like other variables except that at the end we set maybe_assigned if
the function has a sloppy arguments object.

R=adamk@chromium.org, mstarzinger@chromium.org
BUG=v8:5636

Review-Url: https://codereview.chromium.org/2578103002
Cr-Commit-Position: refs/heads/master@{#41731}

This will be used in PromiseHook.

BUG=v8:4643

Review-Url: https://codereview.chromium.org/2581503003
Cr-Commit-Position: refs/heads/master@{#41730}

R=jochen@chromium.org, hpayer@chromium.org, verwaest@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2584563002
Cr-Commit-Position: refs/heads/master@{#41729}

The WasmRunner now always holds a TestingModule, and allows to add
several functions to it. The prepares a change to always run wasm code
with a full module behind it, removing the special handling for "no wasm
instance" at runtime (http://crrev.com/2551053002).
This CL here also templatizes the WasmRunner such that the Call method must
be called with the same signature specified for the WasmRunner. This
already catched several mismatches there.

R=titzer@chromium.org, ahaas@chromium.org
BUG=v8:5620

Review-Url: https://codereview.chromium.org/2551043002
Cr-Commit-Position: refs/heads/master@{#41728}

This was kind of hard to read due to the nesting. Refactor it using short-circuit
a bit more and add some comments to each bit.

Review-Url: https://codereview.chromium.org/2573283003
Cr-Commit-Position: refs/heads/master@{#41727}

R=neis@chromium.org
BUG=v8:5743

Review-Url: https://codereview.chromium.org/2577043004
Cr-Commit-Position: refs/heads/master@{#41726}

If an accessor property is non-configurable, one should not be able
to re-declare it as a function. This specifically applies to special properties like window.location.

BUG=chromium:670596

Review-Url: https://codereview.chromium.org/2582493002
Cr-Commit-Position: refs/heads/master@{#41725}

Similar to object grouping, we cannot trace through blink (and back to V8) after
making weak roots strong because phantom callbacks have already been scheduled
and the handles been zapped.

This is a short-term solution (mimicing what object grouping currently does). It
is not correct in general because we should fully process the subgraph that was
discovered by making some of the weak roots strong.  In long term we need  a
separate handle type on the API level for traced references that have their
handles zapped at a different stage.

Reproduction:
- Initial marking is done, i.e., both marking deques are empty.
- We make weak roots needed for regular finalizers strong.
- We collect phantom callback data and zap handles that are not reachable so far.
- Through new roots we discover wrappables on the blink side that would also keep
  objects that were already scheduled for phantom callbacks alive.
- Since the handle was already zapped we crash during dereferencing.

BUG=chromium:668060,chromium:468240

Review-Url: https://codereview.chromium.org/2580813002
Cr-Commit-Position: refs/heads/master@{#41724}

If the eval contains a let, we need to know whether an inner function
refers to the variable to be able to decide its context allocation
status.

The added test needs https://codereview.chromium.org/2435023002/ too
in order to pass.

BUG=v8:5736

Review-Url: https://codereview.chromium.org/2574753002
Cr-Commit-Position: refs/heads/master@{#41723}

BUG=

Review-Url: https://codereview.chromium.org/2580533002
Cr-Commit-Position: refs/heads/master@{#41722}

The error reported by the graph verifier looks like:

#
# Fatal error in ../src/compiler/machine-graph-verifier.cc, line 638
# TypeError: node #54:ChangeInt32ToInt64 uses node #53:ChangeUint32ToUint64 which doesn't have an int32-compatible representation.
#
# Specify option --csa-trap-on-node=test,54 for debugging.
#

BUG=

Review-Url: https://codereview.chromium.org/2574353002
Cr-Commit-Position: refs/heads/master@{#41721}