* Add caching to handling of dangling loads
* Add two unittests for load elimination on escaped objects

BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1619103004

Cr-Commit-Position: refs/heads/master@{#33498}

BUG=chromium:580506
LOG=N

Review URL: https://codereview.chromium.org/1631673002

Cr-Commit-Position: refs/heads/master@{#33497}

Fix additional cases where the AIX compiler reports that a variable
may be used uninitialized.

R=danno@chromium.org, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1628483003

Cr-Commit-Position: refs/heads/master@{#33496}

This fixes corner cases where the start offsets of exception handler
regions within the handler table fall together. This assumption was
based on full-codegen code and no longer holds with the interpreter.
The tables however are still well nested and code has been added to
verify that in debug mode.

R=rmcilroy@chromium.org
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1633573002

Cr-Commit-Position: refs/heads/master@{#33495}

The current support for try-catch in the interpreter can handle most of
the cases appearing in our test suite. Also the flag in question did not
detect try-finally constructs. This removes the flag and instead extends
the test expectations.

R=rmcilroy@chromium.org
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1631593003

Cr-Commit-Position: refs/heads/master@{#33494}

BUG=

Review URL: https://codereview.chromium.org/1632643002

Cr-Commit-Position: refs/heads/master@{#33493}

If it's Smi::FromInt(0), the NULL check would trigger. Instead, use the
handle-zap value to mean "not set".

BUG=v8:3647,chromium:580651
R=vogelheim@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/1628173002

Cr-Commit-Position: refs/heads/master@{#33492}

This CL reduces the memory overhead of escape analysis
by introducing a "copy on demand" strategy for virtual states
and virtual objects.

BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1606613002

Cr-Commit-Position: refs/heads/master@{#33491}

- Completely rely on the concurrent sweeping state for SweepingCompleted()
- Rename the state accordingly.

CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_asan_rel,v8_linux64_tsan_rel,v8_mac64_asan_rel
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1614953002

Cr-Commit-Position: refs/heads/master@{#33490}

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1627943003

Cr-Commit-Position: refs/heads/master@{#33489}

See https://github.com/tc39/ecma262/issues/128

R=erik.corry@gmail.com, littledan@chromium.org
BUG=v8:2952
LOG=N

Review URL: https://codereview.chromium.org/1608693003

Cr-Commit-Position: refs/heads/master@{#33488}

Cleanup %ForInPrepare runtime entry, and unify common logic with
%ForInEnumerate (renamed from %GetPropertyNamesFast). Also introduce
a TupleType to properly type JSForInPrepare and its projections w/o
special hacks in the Typer. And fix %ForInNext and JSForInNext to be
consistent with fullcodegen again (after the proxy refactorings last
quarter).

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Review URL: https://codereview.chromium.org/1631583002

Cr-Commit-Position: refs/heads/master@{#33487}

This CL implements loop assignment analysis, a pass over a loop's body
to record local variables that are assigned. This pre-pass is similar
to that done on the JavaScript AST for the same reason: avoid introducing
too many phis at loop headers when building a graph.

R=bradnelson@chromium.org,ahaas@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1617723003

Cr-Commit-Position: refs/heads/master@{#33486}

R=mstarzinger@chromium.org,rossberg@chromium.org,bmeurer@chromium.org,hpayer@chromium.org,jochen@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1600873002

Cr-Commit-Position: refs/heads/master@{#33485}

A recent ES2015 semantics web compatibility fix changed a WebKit
test from a syntax error to a known failure without a syntax
error. This confused the fuzzer infrastructure. This patch updates
the test expectations to the expected output, based on what the
new semantics provide.

R=machenbach,adamk
BUG=v8:4693
LOG=N

Review URL: https://codereview.chromium.org/1628013003

Cr-Commit-Position: refs/heads/master@{#33484}

  port a0878333(r33460)

  original commit message:
  We already had hand-written optimized code for %_ToName in fullcodegen,
  but the optimizing compilers always went to the runtime for %_ToName,
  which is pretty bad for many of our builtins. So this CL moves the
  existing native code to a ToNameStub (similar to the existing
  ToStringStub), and uses the ToNameStub consistently in all compilers to
  actually implement %_ToName.

BUG=

Review URL: https://codereview.chromium.org/1622793006

Cr-Commit-Position: refs/heads/master@{#33483}

  port ca51c204(r33463)

  original commit message:
  This fixes the broken return address when the exception handler within
  interpreted bytecode is being entered via stack unwinding. The address
  in question will never actually be taken, but our stack walker uses this
  address to determine whether a frame is interpreted.

BUG=

Review URL: https://codereview.chromium.org/1632453002

Cr-Commit-Position: refs/heads/master@{#33482}

moves, we move those to the node, and remove them from the
predecessors ("merge" them to the common node).

If only some of the moves are common, we don't do anything. This is
what this change addresses.

The bug linked below should be addressed by this change. The only
difference in codegen before/after the change that introduced the bug
was un-merged moves.

BUG=chromium:549262
LOG=N

Review URL: https://codereview.chromium.org/1527203002

Cr-Commit-Position: refs/heads/master@{#33481}

Now TurboFan always uses the newly introduced %ForInPrepare, no matter
whether baseline is the interpreter or fullcodegen. For fullcodegen, we
introduce a new PrepareId bailout point for this purpose.

Drive-by-fix: Avoid the NoObservableSideEffectsScope in Crankshaft and
use the PrepareId bailout point instead.

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Review URL: https://codereview.chromium.org/1630523002

Cr-Commit-Position: refs/heads/master@{#33480}

Rolling v8/buildtools to 222bd42ce39d1bd8f08fe089b066f49c469e1cdf

Rolling v8/tools/clang to 3ed46b50b0b4e8c829ea6492bbe357b2b7b8e64a

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

Review URL: https://codereview.chromium.org/1623773002

Cr-Commit-Position: refs/heads/master@{#33479}

The web appears to depend on being able to redeclare functions-in-blocks
in sloppy mode (examples seen so far tend to redeclare identical functions,
most likely accidentally).

This patch opens a minimal hole: two same-named function declarations
in the same scope are allowed, only in sloppy mode.

BUG=v8:4693, chromium:579395
LOG=y

Review URL: https://codereview.chromium.org/1622723003

Cr-Commit-Position: refs/heads/master@{#33478}

Change the interpreter to always store the current context in the frame's
context slot instead of the function context. This makes it possible to
restore the correct context during deopt.

BUG=v8:4678,v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1604923002

Cr-Commit-Position: refs/heads/master@{#33477}

Port a0878333

Original commit message:
    We already had hand-written optimized code for %_ToName in fullcodegen,
    but the optimizing compilers always went to the runtime for %_ToName,
    which is pretty bad for many of our builtins. So this CL moves the
    existing native code to a ToNameStub (similar to the existing
    ToStringStub), and uses the ToNameStub consistently in all compilers to
    actually implement %_ToName.

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

Review URL: https://codereview.chromium.org/1620313004

Cr-Commit-Position: refs/heads/master@{#33476}

This change allows the PPC simulator to execute on PPC hardware where,
due to calling conventions, we must distinguish between Object* and
ObjectPair return values.

We find this useful as another available option for debugging certain
problems.  While not strictly necessary for Intel platforms, we hope
that this is less offensive now that BUILTIN_CALL_TRIPLE has been
added.

BUG=
R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com

Review URL: https://codereview.chromium.org/1604653006

Cr-Commit-Position: refs/heads/master@{#33475}

These tests have been disabled while support for try-finally was work in
progress. By now control flow is connected properly and the tests pass.

R=oth@chromium.org
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1626503002

Cr-Commit-Position: refs/heads/master@{#33474}

Revert "Revert of [profiler] Implement POC Sampling Heap Profiler (patchset #12 id:220001 of https://codereview.chromium.org/1555553002/ )"

This reverts commit 77df8659.

BUG=

Review URL: https://codereview.chromium.org/1618693004

Cr-Commit-Position: refs/heads/master@{#33473}

This adds an explicit ReThrow bytecode to be used in the modelling of
try-finally statements. An exception that is being re-thrown should not
trigger message object creation or location computation and hence cannot
use the existing Throw bytecode.

R=rmcilroy@chromium.org
TEST=cctest/test-interpreter/InterpreterTryFinally
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1621673002

Cr-Commit-Position: refs/heads/master@{#33472}

Port ca51c204

Original commit message:
    This fixes the broken return address when the exception handler within
    interpreted bytecode is being entered via stack unwinding. The address
    in question will never actually be taken, but our stack walker uses this
    address to determine whether a frame is interpreted.

R=mstarzinger@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
TEST=cctest/test-interpreter/InterpreterTryCatch
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1615093004

Cr-Commit-Position: refs/heads/master@{#33471}

Adds support for ForOf to the interpreter.

BUG=v8:4685
LOG=N

Review URL: https://codereview.chromium.org/1618693005

Cr-Commit-Position: refs/heads/master@{#33470}

In case the receiver map has an enum cache, %ForInPrepare returns the
length of the actual enum cache, which might include properties that
are further down the transition tree tho.

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Review URL: https://codereview.chromium.org/1619353002

Cr-Commit-Position: refs/heads/master@{#33469}

R=jarin@chromium.org
BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1608073003

Cr-Commit-Position: refs/heads/master@{#33468}

Is it frozen water? Is it a train? No, but it's both (relatively) fast and
(relatively) cool, it's ICE, the IC-Explorer. Upload an IC trace and you can
easily* drill-down on where most IC changes happen. It even comes with a colored
title and runs in your favourite browser without dependencies (yeah, I'm looking
at you JQuery!)

*according to a user study with a random 1-person group.

R=mvstanton@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1618213003

Cr-Commit-Position: refs/heads/master@{#33467}

TBR=rmcilroy@chromium.org
TEST=cctest/test-bytecode-generator
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1612373004

Cr-Commit-Position: refs/heads/master@{#33466}

This models function local control flow through try-finally constructs
using a token dispatch mechanism. All paths through the finally block
are assigned a token, at the end of the finally block a switch construct
dispatches according to this token.

R=oth@chromium.org,rmcilroy@chromium.org
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1613443002

Cr-Commit-Position: refs/heads/master@{#33465}

Break and continue operations need to pop the context chain to the
correct context before jumping to the target.

BUG=v8:4280,v8:4678
LOG=N

Review URL: https://codereview.chromium.org/1618693002

Cr-Commit-Position: refs/heads/master@{#33464}

This fixes the broken return address when the exception handler within
interpreted bytecode is being entered via stack unwinding. The address
in question will never actually be taken, but our stack walker uses this
address to determine whether a frame is interpreted.

R=rmcilroy@chromium.org
TEST=cctest/test-interpreter/InterpreterTryCatch
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1615063002

Cr-Commit-Position: refs/heads/master@{#33463}

In d8, run with --runtime-call-stats and it will output the stats when d8 finishes.

In Chrome, run the following: (only on trusted code, this punches *massive* security hole into Chrome)

chrome --js-flags="--runtime-call-stats --allow-natives-syntax"

To get the stats in the console, just run

console.log(%GetAndResetRuntimeCallStats());

To output stats every second:

setInterval(function() { console.log(%GetAndResetRuntimeCallStats()); }, 1000)

Review URL: https://codereview.chromium.org/1615943002

Cr-Commit-Position: refs/heads/master@{#33462}

When accessor getter callback is called the v8::PropertyCallbackInfo::ShouldThrowOnError() is always false, since according to ES6 there's no difference between strict and non-strict property loads. For the setter case the v8::PropertyCallbackInfo::ShouldThrowOnError() returns true if the property is set in strict context.

Interceptors follow same idea: for getter, enumerator and query callbacks the v8::PropertyCallbackInfo::ShouldThrowOnError() is always false, and for setter and deleter callback the v8::PropertyCallbackInfo::ShouldThrowOnError() returns true in strict context.

This CL also cleans up the CallApiGetterStub and removes bogus asserts from [arm] Push(reg1, reg2, ..., regN) that prevented from pushing a set of registers containing duplicates.

BUG=v8:4267
LOG=Y

Committed: https://crrev.com/1d3e837fcbbd9d9fd5e72dfe85dfd47c025f3c9f
Cr-Commit-Position: refs/heads/master@{#33438}

Review URL: https://codereview.chromium.org/1587073003

Cr-Commit-Position: refs/heads/master@{#33461}

We already had hand-written optimized code for %_ToName in fullcodegen,
but the optimizing compilers always went to the runtime for %_ToName,
which is pretty bad for many of our builtins. So this CL moves the
existing native code to a ToNameStub (similar to the existing
ToStringStub), and uses the ToNameStub consistently in all compilers to
actually implement %_ToName.

Review URL: https://codereview.chromium.org/1622493002

Cr-Commit-Position: refs/heads/master@{#33460}

Revert of [runtime] Do not use the enum-cache for non-prototype objects. (patchset #1 id:1 of https://codereview.chromium.org/1612413003/ )

Reason for revert:
let me quickly revert the revert, wut?
Goal: my CL should not be in the tree!

Original issue's description:
> Reland of [runtime] Do not use the enum-cache for non-prototype objects. (patchset #1 id:1 of https://codereview.chromium.org/1619803003/ )
>
> Reason for revert:
> the deopt issues have been taken care of by benedikt
>
> Original issue's description:
> > Revert of [runtime] Do not use the enum-cache for non-prototype objects. (patchset #10 id:180001 of https://codereview.chromium.org/1608523002/ )
> >
> > Reason for revert:
> > tanks for-in significantly
> >
> > Original issue's description:
> > > [runtime] Do not use the enum-cache for keys retrieval.
> > >
> > > Currently we fail to properly handle shadowed properties. If the
> > > receiver defines a non-enumerable property that reappears on the
> > > prototype as enumerable it incorrectly shows up in [[Enumerate]].
> > > By extending the KeyAccumulator to track non-enumerable properties
> > > we can now properly filter them out when seeing them further up in
> > > the prototype-chain.
> > >
> > > BUG=v8:705
> > > LOG=y
> > >
> > > Committed: https://crrev.com/ed24dfe80d1da0827b8571839ee52c03ad09c9c7
> > > Cr-Commit-Position: refs/heads/master@{#33405}
> >
> > TBR=jkummerow@chromium.org,bmeurer@chromium.org
> > # Not skipping CQ checks because original CL landed more than 1 days ago.
> > BUG=v8:705
> > LOG=n
> >
> > Committed: https://crrev.com/6e0573c6fff1c3041bab106d1197ab1b64aa9a6a
> > Cr-Commit-Position: refs/heads/master@{#33443}
>
> TBR=jkummerow@chromium.org,bmeurer@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:705
>
> Committed: https://crrev.com/5569e270eda517b5ea74e3a7676b3230cbe2f7a9
> Cr-Commit-Position: refs/heads/master@{#33458}

TBR=jkummerow@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:705

Review URL: https://codereview.chromium.org/1614313003

Cr-Commit-Position: refs/heads/master@{#33459}