Even after https://codereview.chromium.org/2371963002 we might still
create JSTypedArray instances where the length field is a HeapNumber,
especially when TurboFan no longer canonicalizes all values in Smi
range to Smis (which we try to achieve currently). This adds strict
checking for this fact now.

R=mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2373013002
Cr-Commit-Position: refs/heads/master@{#39771}

Revert of [heap] Always use the passed-in collector in CollectGarbage. (patchset #1 id:1 of https://codereview.chromium.org/2336943003/ )

Reason for revert:
Regresses jank and memory. Revert for offline analysis.

Original issue's description:
> [heap] Always use the passed-in collector in CollectGarbage.
>
> Do not overwrite a collector decision.
>
> BUG=
>
> Committed: https://crrev.com/c19abaddafb5ede5e0d5efbe608b7fc5d7c7fcd0
> Cr-Commit-Position: refs/heads/master@{#39585}

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

Review-Url: https://codereview.chromium.org/2369933004
Cr-Commit-Position: refs/heads/master@{#39770}

BUG=

Review-Url: https://codereview.chromium.org/2372703004
Cr-Commit-Position: refs/heads/master@{#39769}

1) To get proper test coverage for the flag turned off

2) We need more scope analysis in the PreParser to not disable
optimizations for some common cases (inner function "var i" shadowing
outer function vars).

R=verwaest@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2365263005
Cr-Commit-Position: refs/heads/master@{#39768}

BUG=chromium:650577,chromium:648568

Review-Url: https://codereview.chromium.org/2372933003
Cr-Commit-Position: refs/heads/master@{#39767}

BUG=v8:5268, v8:5162
R=ishell@chromium.org

Review-Url: https://codereview.chromium.org/2374703002
Cr-Commit-Position: refs/heads/master@{#39766}

Migrate newly added C++ String Iterator builtins to TFJ builtins, per
step 4. of the String Iterator Baseline Implementation section of the design doc

BUG=v8:5388
R=bmeurer@chromium.org, mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2358263002
Cr-Commit-Position: refs/heads/master@{#39765}

BUG=chromium:576312

Review-Url: https://codereview.chromium.org/2166843002
Cr-Commit-Position: refs/heads/master@{#39764}

BUG=

Review-Url: https://codereview.chromium.org/2367383002
Cr-Commit-Position: refs/heads/master@{#39763}

Turn the StringEqualStub and friends into proper TurboFan builtins,
which means that we don't need to do on-demand compilation for those
stubs, and use those to defer lowering of the StringEqual, etc.
simplified operators to effect/control linearization (i.e. move it to
the concurrent recompilation part).

BUG=v8:5428
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2363333003
Cr-Commit-Position: refs/heads/master@{#39762}

Adding this back in because it's not part of the stability issue.

BUG=chromium:649967
TBR=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2365373004
Cr-Commit-Position: refs/heads/master@{#39761}

BUG=chromium:650172
R=mstarzinger@chromium.org, bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2368323002
Cr-Commit-Position: refs/heads/master@{#39760}

Review-Url: https://codereview.chromium.org/2372173002
Cr-Commit-Position: refs/heads/master@{#39759}

They are nops, but will be used when verifying the machine graph.

BUG=

Review-Url: https://codereview.chromium.org/2367413002
Cr-Commit-Position: refs/heads/master@{#39758}

The MachineOperatorReducer was only reducing word32 expressions of the type x << y | x >>> (32 - y) (and variants) to the equivalent Word32Ror. This CL applies the same pattern-matching logic to Word32Xor.

BUG=

Committed: https://crrev.com/a86397d890d3caa01a947e2a6e71beb1f58e6e6b
Review-Url: https://codereview.chromium.org/2199323003
Cr-Original-Commit-Position: refs/heads/master@{#38284}
Cr-Commit-Position: refs/heads/master@{#39757}

Reland of Preparse functions in the scope that was created when parsing of the function was started (patchset #1 id:1 of https://codereview.chromium.org/2365393002/ )

Reason for revert:
Stability thief found, relanding speculative reverts.

Original issue's description:
> Revert of Preparse functions in the scope that was created when parsing of the function was started (patchset #2 id:20001 of https://codereview.chromium.org/2370713003/ )
>
> Reason for revert:
> Needed for https://codereview.chromium.org/2373443003/
>
> Original issue's description:
> > Preparse functions in the scope that was created when parsing of the function was started
> >
> > This reduces the number of scopes for lazily parsed top-level functions from 3 to 1
> >
> > BUG=v8:5209
> >
> > Committed: https://crrev.com/9618d095903c604a032b33792c068f4a6169503c
> > Cr-Commit-Position: refs/heads/master@{#39725}
>
> TBR=marja@chromium.org,verwaest@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:5209
>
> Committed: https://crrev.com/0cef7100da0b609403c9026fb7307192a898a390
> Cr-Commit-Position: refs/heads/master@{#39729}

TBR=marja@chromium.org,verwaest@chromium.org,hablich@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5209

Review-Url: https://codereview.chromium.org/2377593002
Cr-Commit-Position: refs/heads/master@{#39756}

Reland of Preparse inner functions (new try) (patchset #1 id:1 of https://codereview.chromium.org/2373443003/ )

Reason for revert:
Stability thief found, relanding speculative reverts.

Original issue's description:
> Revert of Preparse inner functions (new try) (patchset #21 id:420001 of https://codereview.chromium.org/2352593002/ )
>
> Reason for revert:
> We currently have some stability issues on Canary. Let's reland this after we verified that we "fixed" Canary again.
>
> Original issue's description:
> > Preparse inner functions (new try)
> >
> > This is an overly pessimistic approach where PreParser only keeps
> > track of unresolved variables, but doesn't declare anything. This
> > will result in context-allocating variables in the outer function
> > unnecessarily, if the variable names clash with variable names
> > used by the inner function (even if the variables are not the
> > same). However, we have been unable to prove that this approach
> > wouldn't be good enough for the practical purposes.
> >
> > Fixes after the previous try ( https://codereview.chromium.org/2322243002/ ):
> > Keep the context-allocation decision stable when compiling fully eagerly.
> >
> > Tests which exercise this functionality:
> > mjsunit/fixed-context-shapes-when-recompiling.js
> >
> > Design document (chromium):
> >
> > https://docs.google.com/a/chromium.org/document/d/1rRv5JJZ0JpOZAZN2CSUwZPFJiBAdRnTiSYhazseNHFg/edit?usp=sharing
> >
> > BUG=
> >
> > Committed: https://crrev.com/7c73cf32c60484cdf37c84f1d61b4640e87068d7
> > Cr-Commit-Position: refs/heads/master@{#39719}
>
> TBR=verwaest@chromium.org,adamk@chromium.org,marja@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=
>
> Committed: https://crrev.com/1e6296b2a7cfc307fd9e722e619f42965da4a267
> Cr-Commit-Position: refs/heads/master@{#39730}

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

Review-Url: https://codereview.chromium.org/2377513006
Cr-Commit-Position: refs/heads/master@{#39755}

BUG=chromium:648864

Review-Url: https://codereview.chromium.org/2373743002
Cr-Commit-Position: refs/heads/master@{#39754}

Ignition collects type feedback for binary and compare operations in type
feedback vector and FCG uses Binary/CompareOpICs to collect type feedback.
The feedback collected by ignition is not used by crankshaft. This hits the
performance, when trying to optimize functions that did not tier upto FCG.
This cl merges the feedback collected by ignition and FCG when passing to
crankshaft.

BUG=v8:4280

Review-Url: https://codereview.chromium.org/2361043002
Cr-Commit-Position: refs/heads/master@{#39753}

Without --enable-benchmarking we might get flaky results due to active
finch experiments.

BUG=
NOTRY=true

Review-Url: https://codereview.chromium.org/2369903002
Cr-Commit-Position: refs/heads/master@{#39752}

This CL introduces StoreICTFStub and StoreICTrampolineTFStub and a switch
to enable them instead of respective platform stubs.

This should ease the split of StoreIC to StoreGlobalIC and StoreIC.

StubCache tests now exercise both load and store ICs.

BUG=chromium:576312

Review-Url: https://codereview.chromium.org/2163253002
Cr-Commit-Position: refs/heads/master@{#39751}

Revert of [tracing] Support ConvertableToTraceFormat argument type. (patchset #5 id:80001 of https://codereview.chromium.org/2367603002/ )

Reason for revert:
Breaks layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/10100

See also:
https://github.com/v8/v8/wiki/Blink%20layout%20tests

Original issue's description:
> [tracing] Support ConvertableToTraceFormat argument type.
>
> Drive-by: Use perfect forwarding for AddTraceEvent arguments.
>
> BUG=406277
>
> Committed: https://crrev.com/dcac49af485fe5d4c0027f153901435dbb29c232
> Cr-Commit-Position: refs/heads/master@{#39742}

TBR=jochen@chromium.org,caseq@chromium.org,fmeawad@chromium.org,alph@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=406277

Review-Url: https://codereview.chromium.org/2371103002
Cr-Commit-Position: refs/heads/master@{#39750}

Revert of [turbofan] ChangeFloat64ToTagged shouldn't canonicalize. (patchset #6 id:100001 of https://codereview.chromium.org/2367593003/ )

Reason for revert:
Still blows up on the main waterfall even after Jakob's fix:

https://build.chromium.org/p/client.v8/builders/V8%20Mac64/builds/11557/steps/Check/logs/typedarray-indexing
https://build.chromium.org/p/client.v8/builders/V8%20Mac64/builds/11557/steps/Check/logs/typedarray
https://build.chromium.org/p/client.v8/builders/V8%20Win64/builds/12982/steps/Check/logs/typedarray

Original issue's description:
> [turbofan] ChangeFloat64ToTagged shouldn't canonicalize.
>
> This matches current Crankshaft/fullcodegen behavior more closely and
> thus reduces the chances that we run into unnecessary polymorphism due
> to the field representation tracking in our object model.
>
> R=jarin@chromium.org
> BUG=v8:5267
>
> Committed: https://chromium.googlesource.com/v8/v8/+/6a939714e991ebf10d56ddbd2869325cca99c0ef
> Committed: https://crrev.com/ee158e6c4cc896479a32245432a3c2fdd31bcb73
> Committed: https://crrev.com/ddf792beb3a72f6dba83e94fc8ada03ebf1630bd
> Cr-Original-Commit-Position: refs/heads/master@{#39692}
> Cr-Commit-Position: refs/heads/master@{#39748}

TBR=jarin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2365353006
Cr-Commit-Position: refs/heads/master@{#39749}

This matches current Crankshaft/fullcodegen behavior more closely and
thus reduces the chances that we run into unnecessary polymorphism due
to the field representation tracking in our object model.

R=jarin@chromium.org
BUG=v8:5267

Committed: https://chromium.googlesource.com/v8/v8/+/6a939714e991ebf10d56ddbd2869325cca99c0ef
Committed: https://crrev.com/ee158e6c4cc896479a32245432a3c2fdd31bcb73
Review-Url: https://codereview.chromium.org/2367593003
Cr-Original-Commit-Position: refs/heads/master@{#39692}
Cr-Commit-Position: refs/heads/master@{#39748}

Rolling v8/build to 43f8b7b4f8fa2290a3ce9f82544514a8d961e2c3

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

Review-Url: https://codereview.chromium.org/2370183002
Cr-Commit-Position: refs/heads/master@{#39747}

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

Review-Url: https://codereview.chromium.org/2372873002
Cr-Commit-Position: refs/heads/master@{#39746}

If we want to allow this in the future, we must force context-allocation for all
variables that are declared at the module level but not MODULE-allocated.

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

Review-Url: https://codereview.chromium.org/2373573003
Cr-Commit-Position: refs/heads/master@{#39745}

BUG=chromium:650404

Review-Url: https://codereview.chromium.org/2371963002
Cr-Commit-Position: refs/heads/master@{#39744}

Use an unordered_map<Module, unordered_set<String>> to keep track
of visited Module/ExportName pairs during ResolveExport.

This required adding a Hash() method to Module, which is accomplished
by allocating a Symbol and storing it in the SharedFunctionInfo::name
slot, then delegating the hash to that Symbol.

Also added a helper method Module::shared() to easily get ahold of
the SharedFunctionInfo and call it in the appropriate places instead
of re-doing the ternary operator.

BUG=v8:1569

Review-Url: https://codereview.chromium.org/2367623004
Cr-Commit-Position: refs/heads/master@{#39743}

Drive-by: Use perfect forwarding for AddTraceEvent arguments.

BUG=406277

Review-Url: https://codereview.chromium.org/2367603002
Cr-Commit-Position: refs/heads/master@{#39742}

Fix "error: ‘maximum’ may be used uninitialized in this function"

R=ahaas@chromium.org, titzer@chromium.org, rossberg@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2371833002
Cr-Commit-Position: refs/heads/master@{#39741}

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

Review-Url: https://codereview.chromium.org/2367403003
Cr-Commit-Position: refs/heads/master@{#39740}

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

Review-Url: https://codereview.chromium.org/2369133002
Cr-Commit-Position: refs/heads/master@{#39739}

This allows the CreateExport/ResolveExport methods to be private to Module.

R=neis@chromium.org
BUG=v8:1569

Review-Url: https://codereview.chromium.org/2368393002
Cr-Commit-Position: refs/heads/master@{#39738}

Revert of [stubs] Port SubStringStub to TurboFan (patchset #8 id:140001 of https://codereview.chromium.org/2355793003/ )

Reason for revert:
Speculative revert because of stability problems

Original issue's description:
> [stubs] Port SubStringStub to TurboFan
>
> This ports the platform-specific SubStringStub to TurboFan.
>
> It also contains a minor bug-fix for the case when the requested substring
> length equals the subject string length, but the start index is not equal to 0.
> The old stub implementation returned the subject string, while the new
> implementation calls into runtime, which finally results in a thrown exception.
>
> BUG=v8:5415
>
> Committed: https://crrev.com/49be31921536716706a6790fbbf9c346b975af16
> Cr-Commit-Position: refs/heads/master@{#39653}

TBR=ishell@chromium.org,bmeurer@chromium.org,jgruber@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=v8:5415, chromium:649967
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2365413002
Cr-Commit-Position: refs/heads/master@{#39737}

Revert of [compiler] Properly guard the speculative optimizations for instanceof. (patchset #3 id:40001 of https://codereview.chromium.org/2370693002/ )

Reason for revert:
Tanks EarleyBoyer.

Original issue's description:
> [compiler] Properly guard the speculative optimizations for instanceof.
>
> Add a general feedback slot for instanceof similar to what we already have
> for for-in, which basically has a fast (indicated by the uninitialized
> sentinel) and a slow (indicated by the megamorphic sentinel) mode. Now
> we can only take the fast path when the feedback slot says it hasn't
> seen any funky inputs and nothing funky appeared in the prototype chain.
> In the TurboFan code we also deoptimize whenever we see a funky object
> (i.e. a proxy or an object that requires access checks) in the prototype
> chain (similar to what Crankshaft already did).
>
> Drive-by-fix: Also make Crankshaft respect the mode and therefore
> address the deopt loop in Crankshaft around instanceof.
>
> We might want to introduce an InstanceOfIC mechanism at some point and
> track the map of the right-hand side.
>
> BUG=v8:5267
> R=mvstanton@chromium.org
>
> Committed: https://crrev.com/a0484bc6116ebc2b855de87d862945e2ae07169b
> Cr-Commit-Position: refs/heads/master@{#39718}

TBR=mvstanton@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2365223003
Cr-Commit-Position: refs/heads/master@{#39736}

BUG=chromium:648568

Review-Url: https://codereview.chromium.org/2366393002
Cr-Commit-Position: refs/heads/master@{#39735}

All warnings were fixed. MSVS builds V8 with inspector without warnings.

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

Review-Url: https://codereview.chromium.org/2364473003
Cr-Commit-Position: refs/heads/master@{#39734}

R=bmeurer@chromium.org,jarin@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2366993002
Cr-Commit-Position: refs/heads/master@{#39733}

Review-Url: https://codereview.chromium.org/2365343002
Cr-Commit-Position: refs/heads/master@{#39732}