This patch changes the test262 infrastructure to pass individual flags,
specified in the status file, for tests for experimental features, rather
than passing --harmony for all runs. With this change, it should be
easier to run test262 tests in automation when developing new features.
The new workflow would be, when adding a flag, include the flag in the
test expectations file, and when removing the flag, remove the lines from
the test expectations file. This way, the status file does not have to
change when staging or unstaging, and you get the benefit of the automated
tests before staging starts.

R=adamk
CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_linux_noi18n_rel_ng

Review-Url: https://codereview.chromium.org/2601393002
Cr-Commit-Position: refs/heads/master@{#42249}

Skipping this work seems to perturb a gc-stress issue.
More investigation is likely needed.

BUG=v8:4203
R=danno@chromium.org

Review-Url: https://codereview.chromium.org/2629043002
Cr-Commit-Position: refs/heads/master@{#42248}

Revert of [crankshaft] Also inline Math.ceil. (patchset #1 id:1 of https://codereview.chromium.org/2621903002/ )

Reason for revert:
Suspected of causing crashes on Canary: https://crbug.com/680108

Original issue's description:
> [crankshaft] Also inline Math.ceil.
>
> Inline calls to Math.ceil(x) as -Math.floor(-x) via the existing fast
> path in Crankshaft.
>
> R=ishell@chromium.org
> BUG=v8:5782
>
> Review-Url: https://codereview.chromium.org/2621903002
> Cr-Commit-Position: refs/heads/master@{#42161}
> Committed: https://chromium.googlesource.com/v8/v8/+/a3859e48c3c5c1c4f8a0c76b65a389b6063eba89

TBR=ishell@chromium.org,bmeurer@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=v8:5782, chromium:680108

Review-Url: https://codereview.chromium.org/2629493002
Cr-Commit-Position: refs/heads/master@{#42247}

Move the language code checking for 4 languages requiring
special case mapping to C++ from JavaScript.

This is a speculative fix for crashes reported from Windows and
Mac Chrome canary builds when icu-case-mapping is enabled by
default. (see crbug.com/676643)

In addition, tighten up comparision operators in a couple of
places in i18n.js (=== and !== instead of == and !=).

BUG=v8:4477, v8:4476, chromium:676643
TEST=test262/{built-ins,intl402}/Strings/*, webkit/fast/js/*,
     mjsunit/string-case, intl/general/case*

Review-Url: https://codereview.chromium.org/2621393002
Cr-Commit-Position: refs/heads/master@{#42246}

Review-Url: https://codereview.chromium.org/2623023003
Cr-Commit-Position: refs/heads/master@{#42245}

This directs all asm.js traffic via the Wasm backend.

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

Review-Url: https://codereview.chromium.org/2624813002
Cr-Original-Commit-Position: refs/heads/master@{#42194}
Committed: https://chromium.googlesource.com/v8/v8/+/946cc371ed4b34d1a9f5cc615b14c41b652562ad
Review-Url: https://codereview.chromium.org/2624813002
Cr-Commit-Position: refs/heads/master@{#42244}

This is part of removing the dependency of the Chromium browser DLL on
Windows on V8.

R=jochen@chromium.org
BUG=chromium:581766

Review-Url: https://codereview.chromium.org/2621983002
Cr-Commit-Position: refs/heads/master@{#42243}

Also, add a runtime function to call the interpreter, passing a
stack-allocated buffer holding the arguments.
The WASM_INTERPRETER_ENTRY stub allocates the stack slot for the
arguments, fills it, and calls to the wasm interpreter.
It's abi is compatible with WASM functions, such that we can just
replace a call to a WASM_FUNCTION with a call to
WASM_INTERPRETER_ENTRY.
See tracking bug to get the overall picture.

BUG=v8:5822
R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2619803004
Cr-Commit-Position: refs/heads/master@{#42242}

These interfere with layout tests.

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

Review-Url: https://codereview.chromium.org/2628703003
Cr-Commit-Position: refs/heads/master@{#42241}

R=titzer@chromium.org
BUG=chromium:679352
TEST=cctest/test-run-wasm-interpreter/GrowMemory

Review-Url: https://codereview.chromium.org/2627943002
Cr-Commit-Position: refs/heads/master@{#42240}

This will be used to pass parameters of wasm functions to the wasm
interpreter. All of them need to be packed into one buffer, which is
then passed to the interpreter.

R=ahaas@chromium.org, titzer@chromium.org
BUG=v8:5822

Review-Url: https://codereview.chromium.org/2624183002
Cr-Commit-Position: refs/heads/master@{#42239}

According to the latest spec changes the WasmToJS wrapper and the
JSToWasm wrapper through a TypeError if the signature of the wrapper
contains a I64 parameter or return value. Originally the TypeError was
thrown when the parameter or return value was converted to or from JS.

In addition I removed all special handling of I64 parameters and return
values in the wrappers which was already dead code.

R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2626853003
Cr-Commit-Position: refs/heads/master@{#42238}

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, v8-mips-ports@googlegroups.com

Review-Url: https://codereview.chromium.org/2627003002
Cr-Commit-Position: refs/heads/master@{#42237}

Since type feedback is stored as Smis, we can avoid a few shift
instructions per bytecode handler by performing type feedback updates
on Smis directly, rather than converting between Smi and Word32.

Review-Url: https://codereview.chromium.org/2624753002
Cr-Commit-Position: refs/heads/master@{#42236}

using newly introduced ThinStrings, which store a pointer to the actual,
internalized string they represent.

BUG=v8:4520

(Previously landed as #42168 / af51befe)
(Previously landed as #42193 / 4c699e34)

Review-Url: https://codereview.chromium.org/2549773002
Cr-Commit-Position: refs/heads/master@{#42235}

The Local<Value> in the MessageCallback typedef is named "error", but
should be "data" - it's referred to as "data" everywhere else, and
that seems to be the canonical name for a curried-in value.

BUG=None

Review-Url: https://codereview.chromium.org/2621163003
Cr-Commit-Position: refs/heads/master@{#42234}

R=rossberg@chromium.org
BUG=v8:5814,chromium:575167

Review-Url: https://codereview.chromium.org/2623183002
Cr-Commit-Position: refs/heads/master@{#42233}

BUG=chromium:680110
TBR=clemensh@chromium.org, titzer@chromium.org, ahaas@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2626073002
Cr-Commit-Position: refs/heads/master@{#42232}

R=rossberg@chromium.org
BUG=v8:5813,chromium:575167

Review-Url: https://codereview.chromium.org/2620203005
Cr-Commit-Position: refs/heads/master@{#42231}

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, v8-mips-ports@googlegroups.com

Review-Url: https://codereview.chromium.org/2628433004
Cr-Commit-Position: refs/heads/master@{#42230}

Review-Url: https://codereview.chromium.org/2626013002
Cr-Commit-Position: refs/heads/master@{#42229}

for debugging. This function is needed to pass increased heap limit
from the main DevTools isolate to the worker isolates it spawns.

BUG=chromium:675911

Review-Url: https://codereview.chromium.org/2624973003
Cr-Commit-Position: refs/heads/master@{#42228}

BUG=chromium:676635

Review-Url: https://codereview.chromium.org/2628853002
Cr-Commit-Position: refs/heads/master@{#42227}

BUG=

Review-Url: https://codereview.chromium.org/2621303002
Cr-Commit-Position: refs/heads/master@{#42226}

This API will allow DevTools to intercept out-of-memory condition,
increase the heap limit and schedule heap snapshot.

BUG=chromium:675911

Review-Url: https://codereview.chromium.org/2621873003
Cr-Commit-Position: refs/heads/master@{#42225}

This changes the BytecodeGraphBuilder interface to make the fact that
graph construction is independent of a closure explicit. A valid graph
can be constructed by providing only the pair of statically known values
for SharedFunctionInfo and TypeFeedbackVector. This is in preparation of
inlining based on the SharedFunctionInfo.

R=jarin@chromium.org
BUG=v8:2206

Review-Url: https://codereview.chromium.org/2626623002
Cr-Commit-Position: refs/heads/master@{#42224}

This is mainly to catch a crash that we see in Canary with escape
analysis on.

Review-Url: https://codereview.chromium.org/2625893003
Cr-Commit-Position: refs/heads/master@{#42223}

Revert of [wasm] Enable WASM by default (--expose-wasm=true). (patchset #3 id:40001 of https://codereview.chromium.org/2623743003/ )

Reason for revert:
layout test breakages:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/12574

revert first to unblock rolling. otherwise please rebaseline.

Original issue's description:
> [wasm] Enable WASM by default (--expose-wasm=true).
>
> BUG=chromium:575167
> R=rossberg@chromium.org,ahaas@chromium.org,clemensh@chromium.org,bradnelson@chromium.org
>
> Review-Url: https://codereview.chromium.org/2623743003
> Cr-Original-Commit-Position: refs/heads/master@{#42197}
> Committed: https://chromium.googlesource.com/v8/v8/+/34b63f050b1a247bb64ddc91c967501ce04e011f
> Review-Url: https://codereview.chromium.org/2623743003
> Cr-Commit-Position: refs/heads/master@{#42214}
> Committed: https://chromium.googlesource.com/v8/v8/+/71f5650828ffd0162fcd67d9c6ef570a346a8a84

TBR=clemensh@chromium.org,ahaas@chromium.org,bradnelson@chromium.org,rossberg@chromium.org,bradnelson@google.com,titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2621323002
Cr-Commit-Position: refs/heads/master@{#42222}

This CL modifies the ast-numbering phase to collect function literals which
should be compiled eagerly. This is then used to eagerly compile the inner
functions before compiling the outer function. This will be used to queue
compilation jobs on the CompilerDispatcher in a later CL.

This CL moves the compilation of eager inner functions out of the
GetSharedFunctionInfo function and instead compiles them explicitly. This
simplifies GetSharedFunctionInfo and also means there is no need to pass a
LazyCompilationMode to the function, so this concept has been removed.

BUG=v8:5203,v8:5215

Review-Url: https://codereview.chromium.org/2618553004
Cr-Commit-Position: refs/heads/master@{#42221}

R=jgruber@chromium.org
BUG=v8:5530

Review-Url: https://codereview.chromium.org/2589203002
Cr-Original-Commit-Position: refs/heads/master@{#41911}
Committed: https://chromium.googlesource.com/v8/v8/+/381082168d37d4f2794360ae31dc078f2a350113
Review-Url: https://codereview.chromium.org/2589203002
Cr-Commit-Position: refs/heads/master@{#42220}

This has been broken since forever.

BUG=v8:5669

Review-Url: https://codereview.chromium.org/2610343002
Cr-Commit-Position: refs/heads/master@{#42219}

Most notably, the interpreter now calls this stub instead of the
runtime.

BUG=

Review-Url: https://codereview.chromium.org/2619163004
Cr-Commit-Position: refs/heads/master@{#42218}

BUG=chromium:680064
TBR=clemensh@chromium.org, titzer@chromium.org, ahaas@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2620333002
Cr-Commit-Position: refs/heads/master@{#42217}

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2624113002
Cr-Commit-Position: refs/heads/master@{#42216}

Also suppress a testcase using f.arguments.

BUG=chromium:662424
TBR=jarin@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2625983002
Cr-Commit-Position: refs/heads/master@{#42215}

BUG=chromium:575167
R=rossberg@chromium.org,ahaas@chromium.org,clemensh@chromium.org,bradnelson@chromium.org

Review-Url: https://codereview.chromium.org/2623743003
Cr-Original-Commit-Position: refs/heads/master@{#42197}
Committed: https://chromium.googlesource.com/v8/v8/+/34b63f050b1a247bb64ddc91c967501ce04e011f
Review-Url: https://codereview.chromium.org/2623743003
Cr-Commit-Position: refs/heads/master@{#42214}

and rename WasmFrame to WasmCompiledFrame.
The WasmToInterpreterFrames are not used yet; this will follow in a
follow-up CL (see tracking bug for the overall picture).
Those frames will represent frames for WASM_TO_INTERPRETER stubs, which
call from wasm code to the wasm interpreter, implemented in C++.
They will support the Summarize method to inspect the stack frames in
the wasm interpreter.

R=yangguo@chromium.org, titzer@chromium.org
BUG=v8:5822

Review-Url: https://codereview.chromium.org/2623773004
Cr-Commit-Position: refs/heads/master@{#42213}

Revert of Internalize strings in-place (patchset #17 id:320001 of https://codereview.chromium.org/2549773002/ )

Reason for revert:
blocks roll, see: https://codereview.chromium.org/2628733002/

Debug mode runs into an Abort("External string expected, but not found").

Original issue's description:
> Internalize strings in-place (reland)
>
> using newly introduced ThinStrings, which store a pointer to the actual,
> internalized string they represent.
>
> BUG=v8:4520
>
> (Previously landed as #42168 / af51befe.
>
> Review-Url: https://codereview.chromium.org/2549773002
> Cr-Commit-Position: refs/heads/master@{#42193}
> Committed: https://chromium.googlesource.com/v8/v8/+/4c699e349a4986b28574b3a51e8780e3a3d067b1

TBR=ishell@chromium.org,hpayer@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4520

Review-Url: https://codereview.chromium.org/2625073002
Cr-Commit-Position: refs/heads/master@{#42212}

BUG=chromium:679957
NOTRY=true
TBR=jarin@chromium.org,bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2628813002
Cr-Commit-Position: refs/heads/master@{#42211}

Lower StoreDataPropertyInLiteral() when storing
computed property names in object literals.

Add a new AccessMode, kStoreInLiteral. It is similar to
AccessMode::kStore but does not look
up properties on the prototype chain.

99% of all literal definitions with computed property names
end up with generic access_info because of how we count
properties. Once we fix
https://bugs.chromium.org/p/v8/issues/detail?id=5625,
they'll get lowered as well.

BUG=v8:5624

Review-Url: https://codereview.chromium.org/2619773002
Cr-Commit-Position: refs/heads/master@{#42210}