This change adds support for local control flow when building graphs
from bytecode. The change ensures loop emitted from the bytecode
generator are in natural order so the only back branches are for loops.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1502243002

Cr-Commit-Position: refs/heads/master@{#32911}

BUG=chromium:568765
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1534453002

Cr-Commit-Position: refs/heads/master@{#32910}

If many threads use the same Isolate (or many Isolates) and then
terminate, their PerIsolateThreadData objects are never cleaned
up, resulting in a slow memory leak and, worse, the
PerIsolateThreadData chain getting larger and larger, adversely
affecting performance.

In this situation, embedders will now be encouraged to apply
DiscardThreadSpecificMetadata against any Isolate a thread is
done with, especially if the thread is about to terminate.

Note that it is harmless to run DiscardThreadSpecificMetadata
against an Isolate for which a thread has no thread data and
per-Isolate thread data can be reestablished if a thread starts
using an Isolate again after running DiscardThreadSpecificMetadata
against it.

It is, however, an embedder error to run
DiscardThreadSpecificMetadata against an Isolate in thread with a
Locker for the Isolate in the stack or against an Entered Isolate.

This change cannot cause any change in behavior in existing apps
as the only added coded can only be reached via the new
DiscardThreadSpecificMetadata method.

R=Jakob, jochen
BUG=

Review URL: https://codereview.chromium.org/1522703002

Cr-Commit-Position: refs/heads/master@{#32909}

On x64 and arm64 TryTruncateFloatXXToInt64 incorrectly failed when the
input was INT64_MIN.

R=bradnelson@chromium.org, mstarzinger@chromium.org, v8-arm-ports@googlegroups.com

Review URL: https://codereview.chromium.org/1526293002

Cr-Commit-Position: refs/heads/master@{#32908}

BUG=chromium:568883
LOG=n

Review URL: https://codereview.chromium.org/1517983002

Cr-Commit-Position: refs/heads/master@{#32907}

Adds a slot for the bytecode offset to interpreter stack frames and
saves it on calls, and restores after calls.

Also fixes RawMachineAssembler::Return() to call MergeControlToEnd.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1512543002

Cr-Commit-Position: refs/heads/master@{#32906}

BUG=v8:811
LOG=y

Review URL: https://codereview.chromium.org/1515613009

Cr-Commit-Position: refs/heads/master@{#32905}

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/1534443002

Cr-Commit-Position: refs/heads/master@{#32904}

We can no longer just walk the prototype chain without doing proper access-checks. When installing a proxy as the __proto__ of the global object we might accidentally end up invoking cross-realm code without access-checks (see proxies-cross-realm-ecxeption.js).

Review URL: https://codereview.chromium.org/1521953002

Cr-Commit-Position: refs/heads/master@{#32903}

We must print "[object Array]" for proxies that satisfy Array.isArray.

Cosmetic change on the side: move ObjectProtoToString from JSObject to Object
since it deals with arbitrary objects.

R=adamk@chromium.org, verwaest@chromium.org
BUG=v8:1543
LOG=n

Review URL: https://codereview.chromium.org/1526023002

Cr-Commit-Position: refs/heads/master@{#32902}

Introduce JSCreateIterResultObject operator, as a way to optimize the
%_CreateIterResultObject intrinsic, which is used to provide uniform,
non-polymorphic result objects for iterators (and generators).  We
cannot utilize the existing JSCreate operator here, because there's no
constructor function for iterator result objects (as required by the
spec).

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1531753002

Cr-Commit-Position: refs/heads/master@{#32901}

R=rossberg
BUG=v8:1543
LOG=n

Review URL: https://codereview.chromium.org/1525983002

Cr-Commit-Position: refs/heads/master@{#32900}

Tests for
* aborting a full page.
* partially aborting a page.
* partially aborting a page with pointers between aborted pages.
* partially aborting a page with store buffer entries.

Also introduces force_oom() which prohibits a old space to
expand

BUG=chromium:524425
LOG=N

CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_nosnap_rel,v8_linux_nosnap_dbg,v8_win_nosnap_shared_rel,v8_win_nosnap_shared_compile_rel

Review URL: https://codereview.chromium.org/1518803005

Cr-Commit-Position: refs/heads/master@{#32899}

R=erik.corry@gmail.com
BUG=chromium:570241
LOG=N

Review URL: https://codereview.chromium.org/1528333002

Cr-Commit-Position: refs/heads/master@{#32898}

The problem is this: when stepping over a recursive function call,
the recursive function is flooded with one-shot break points so that
we break after the call, but since the callee is the same function,
the callee is also flooded, resulting a break in the callee. That
however would have been a "step in" instead of "step over".

The original solution was to recognize this by comparing FP. If we
end up in Debug::Break, we still have to check the current FP against
the remembered FP to see whether we are on the same stack height.
If we are deeper, then it's not a "step over", and we do not trigger
a debug break event. In that case, we queue up the step-over, and
temporarily step out until we hit the desired stack height. Note that
in order to step out, we flood the caller, which in our example is
the same function as the callee. So we break at every flooded break
location, and comparing with FP to make sure we stepped out prevents
us from triggering debug break events.

The new solution simply ignores breaks when the FP compare fails.
We simply carry on until we hit a break where the FP compare succeeds.
There is no need to do a step out. The number of calls to Debug::Break
that do not trigger a debug break event due to failing FP compare is
the same. But the code is a lot easier to read.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1527253002

Cr-Commit-Position: refs/heads/master@{#32897}

While not really fitting our directory layout, the DEPS entry needs to
be at exactly the same position as it is in chromium, otherwise either
standalone or chromium build won't work :-/

BUG=none
R=machenbach@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/1526843004

Cr-Commit-Position: refs/heads/master@{#32896}

TEST=asm-wasm.js
R=titzer@chromium.org,bradnelson@google.com
BUG=

Review URL: https://codereview.chromium.org/1523843003

Cr-Commit-Position: refs/heads/master@{#32895}

The new implementation also changes the sign bit if the input is NaN.
(https://github.com/WebAssembly/v8-native-prototype/issues/99)

R=bradnelson@chromium.org

Review URL: https://codereview.chromium.org/1532513002

Cr-Commit-Position: refs/heads/master@{#32894}

The code generation for pushing call parameters on the stack does not
distinguish between float32 and float64 parameters because both are
stored in the same registers. Therefore float32 parameters require two
words on the stack.  The wasm linkage, however, only considered one word
on the stack for float32 parameters, which caused the problem that
float32 parameters were not located correctly on the stack. I fixed the
problem by considering two words for float32 parameters on the stack.

R=bradnelson@chromium.org

Review URL: https://codereview.chromium.org/1529773003

Cr-Commit-Position: refs/heads/master@{#32893}

BUG=v8:1543,chromium:570120
LOG=n

Review URL: https://codereview.chromium.org/1530873002

Cr-Commit-Position: refs/heads/master@{#32892}

LOG=n
BUG=v8:1543

Review URL: https://codereview.chromium.org/1531683002

Cr-Commit-Position: refs/heads/master@{#32891}

Following up on https://crrev.com/1517243002, we use the
%_GetSuperConstructor consistently for all super calls now
(inlining the intrinsic code in fullcodegen).

R=mstarzinger@chromium.org
BUG=v8:3330
LOG=n

Review URL: https://codereview.chromium.org/1529113002

Cr-Commit-Position: refs/heads/master@{#32890}

R=hablich@chromium.org
BUG=v8:4545
LOG=Y

Review URL: https://codereview.chromium.org/1524233003

Cr-Commit-Position: refs/heads/master@{#32889}

BUG=v8:4613
LOG=N
R=adamk@chromium.org

Review URL: https://codereview.chromium.org/1522693002

Cr-Commit-Position: refs/heads/master@{#32888}

Fix invalid usage of layout_descriptor() function on 32-bit arch's,
which doesn't perform necessary checks. Test failure is observed only on
mips32 big-endian, and on mips32 little-endian as an alignment issue,
but the problem appears to be generic for all 32-bit arch's.

TEST=test/mjsunit/es6/classes-subclass-builtins.js
BUG=

Review URL: https://codereview.chromium.org/1522203004

Cr-Commit-Position: refs/heads/master@{#32887}

R=hablich@chromium.org

Review URL: https://codereview.chromium.org/1531653002

Cr-Commit-Position: refs/heads/master@{#32886}

And tons of changes to debugger tests.

R=bmeurer@chromium.org
BUG=chromium:569835
LOG=N

Review URL: https://codereview.chromium.org/1525173003

Cr-Commit-Position: refs/heads/master@{#32885}

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1529823002

Cr-Commit-Position: refs/heads/master@{#32884}

The TypeOfStub didn't test the undetectable bit properly if the instance
was also callable, and therefore returned "object" for document.all
(which is both undetectable and callable).

CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
R=yangguo@chromium.org
BUG=chromium:567998
LOG=n

Committed: https://crrev.com/02cc310370df7e51ac4f705038820066fdfd0cdc
Cr-Commit-Position: refs/heads/master@{#32852}

Review URL: https://codereview.chromium.org/1527863003

Cr-Commit-Position: refs/heads/master@{#32883}

The %HeapObjectGetMap and %MapGetInstanceType intrinsics are obsolete
because they are unsafe, so we can drop the code.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1532493002

Cr-Commit-Position: refs/heads/master@{#32882}

The JSCreateClosure operator always produces a function, so the type
should reflect that.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1532503002

Cr-Commit-Position: refs/heads/master@{#32881}

If JSCreate (which corresponds to %NewObject) would ever trigger a lazy
deopt, we would deopt after the constructor call, skipping all the
initialization and what else in the constructor function, which is
wrong. Instead we can use the eager bailout point right before the
constructor function, because allocation is not observable and so we can
safely repeat the %NewObject in case of lazy bailout.

R=yangguo@chromium.org
BUG=v8:4544
LOG=n

Review URL: https://codereview.chromium.org/1530583004

Cr-Commit-Position: refs/heads/master@{#32880}

TBR=adamk@chromium.org
R=erik.corry@gmail.com
BUG=v8:4616
LOG=N

Review URL: https://codereview.chromium.org/1522353002

Cr-Commit-Position: refs/heads/master@{#32879}

Flatten ConsString objects in JSGraph, to make sure we consistently
flatten all cons strings no matter which pass creates them.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1529053003

Cr-Commit-Position: refs/heads/master@{#32878}

credits to gcov.

R=cbruni@chromium.org

Review URL: https://codereview.chromium.org/1522273003

Cr-Commit-Position: refs/heads/master@{#32877}

With the handle canonicalization we can now easily cache heap constant
nodes based on the location of the HeapObject handle location.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1523323005

Cr-Commit-Position: refs/heads/master@{#32876}

...except for 2 places (map::insert and map::find returns)

[turbofan] move down parallel moves

BUG=

Review URL: https://codereview.chromium.org/1531453003

Cr-Commit-Position: refs/heads/master@{#32875}

The regression the bug tracks (see the bug link) appears to
be due to identical gap moves in the predecessors of a block
not being moved to the common successor. This CR fixes one
reason that is happening.

BUG=chromium:549262
LOG=n

Review URL: https://codereview.chromium.org/1523393003

Cr-Commit-Position: refs/heads/master@{#32874}

Rolling v8/third_party/icu to 8d342a405be5ae8aacb1e16f0bc31c3a4fbf26a2

Rolling v8/tools/clang to 6261565695263bd878edd055e81ecc5e989711d6

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

Review URL: https://codereview.chromium.org/1529973004

Cr-Commit-Position: refs/heads/master@{#32873}

The proxy may be on its own target's or handler's prototype chain, leading
to infinite recursion either when looking up the trap, or when calling
through to the target.
We can't eagerly prevent this from happening (e.g. at "foo.__proto__ = bar"
calling time) because the presence of traps can change at any time.

BUG=v8:1543,chromium:569882
LOG=n

Review URL: https://codereview.chromium.org/1526953002

Cr-Commit-Position: refs/heads/master@{#32872}