Ordinary arrow functions have 'undefined' in their frame's receiver.
Generators restore the receiver to the frame based on one passed in
when they are constructed in CreateJSGeneratorObject.

This patch makes async arrow functions pass in 'undefined' for their
receiver so that they have the same behavior as ordinary arrow
functions, which avoids the issue of encountering TDZ when calling
an async arrow function in a subclass constructor before a super
call has returned.

BUG=v8:4483

Review-Url: https://codereview.chromium.org/1976813002
Cr-Commit-Position: refs/heads/master@{#36264}

BUG=v8:4483
LOG=N
R=littledan@chromium.org, adamk@chromium.org

Review-Url: https://codereview.chromium.org/1895603002
Cr-Commit-Position: refs/heads/master@{#36263}

Re-landing https://codereview.chromium.org/1948403002/

New changes:

move variable initialization to make compiler happy

BUG=v8:4973
LOG=y

Review-Url: https://codereview.chromium.org/1969203004
Cr-Commit-Position: refs/heads/master@{#36262}

BUG=v8:4483
LOG=Y
R=littledan@chromium.org, adamk@chromium.org

Review-Url: https://codereview.chromium.org/1841543003
Cr-Commit-Position: refs/heads/master@{#36261}

Remove checks for IC hotness from Ignition tiering up decision since this is
not relevent for full-codegen compilation. Also make the decision about what
tier we are moving to more explicit and visible in --trace-opt.

BUG=v8:4280
LOG=N

Review-Url: https://codereview.chromium.org/1969773002
Cr-Commit-Position: refs/heads/master@{#36260}

Rolling v8/build to 7854acf73fc05ab8b2cd340737eba14e3c442826

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

Review-Url: https://codereview.chromium.org/1981783002
Cr-Commit-Position: refs/heads/master@{#36259}

Rolling v8/build to d4fdf55ba8b19ee50d864162c343fd1939d00fe7

Rolling v8/buildtools to 06e80a0e17319868d4a9b13f9bb6a248dc8d8b20

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

Review-Url: https://codereview.chromium.org/1977243002
Cr-Commit-Position: refs/heads/master@{#36258}

Rewrite encodeURI as runtime function. We well probably
repackage runtime_URIEncode as a C++ builtin.

BUG=v8:4912

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/1968953002
Cr-Commit-Position: refs/heads/master@{#36257}

Rolling v8/base/trace_event/common to 54b8455be9505c2cb0cf5c26bb86739c236471aa

Rolling v8/build to 93c1eb80b485df02249b83452a42b7a13b3bde28

Rolling v8/buildtools to e9fb74175ea7c3f251baad24d9ebe03c01ed5aba

Rolling v8/tools/gyp to bce1c7793010574d88d7915e2d55395213ac63d1

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

Review-Url: https://codereview.chromium.org/1980813002
Cr-Commit-Position: refs/heads/master@{#36256}

Revert of [ignition] Inline the binary op TurboFan code stubs in the bytecode handlers. (patchset #1 id:1 of https://codereview.chromium.org/1974293002/ )

Reason for revert:
Causes cctest/test-serialize/SnapshotDataBlobWithWarmup failure on arm64:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20debug/builds/534

Original issue's description:
> [ignition] Inline the binary op TurboFan code stubs in the bytecode handlers.
>
> Trying to reland http://crrev.com/1902823002.
>
> This time some blocks have been shuffled around in the AddStub so that the frame still doesn't get built for the fast path.
>
> Committed: https://crrev.com/567160122de0bdb78aea79a9faa0dc15a564484c
> Cr-Commit-Position: refs/heads/master@{#36251}

TBR=bmeurer@chromium.org,rmcilroy@chromium.org,epertoso@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/1978993003
Cr-Commit-Position: refs/heads/master@{#36255}

This reverts commit 41d571df.

Reason for revert: This patch breaks the correctness of the typedarray
properties such as length, byteOffset, byteLength.

The accessor check optimization code is dead code eliminated. A follow
up patch will fix this optimization correctly.

BUG=chromium:593634

Review-Url: https://codereview.chromium.org/1977983002
Cr-Commit-Position: refs/heads/master@{#36254}

Review-Url: https://codereview.chromium.org/1967673002
Cr-Commit-Position: refs/heads/master@{#36253}

Port 40f34541

Original commit message:

    The previous approach taken by FastNew[Sloppy,Strict,Rest]ArgumentsStub
    looked at the function slot in order to skip stub frames
    and find the JS frame. However, stub frames do not have a
    function slot (in fact their fixed frame ends one slot
    before the JS frame's function slot). Therefore, if this
    location in the stub frame happens to have the function
    object the create arguments stubs won't skip this frame
    correctly.

    Replace this approach with one where the stub is
    specialized to either skip a frame if required (since
    there will only ever be one extra frame on Ignition
    the loop approach isn't necessary).

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

Review-Url: https://codereview.chromium.org/1978823002
Cr-Commit-Position: refs/heads/master@{#36252}

Trying to reland http://crrev.com/1902823002.

This time some blocks have been shuffled around in the AddStub so that the frame still doesn't get built for the fast path.

Review-Url: https://codereview.chromium.org/1974293002
Cr-Commit-Position: refs/heads/master@{#36251}

Reland of move v8_toolset_for_d8 flag (patchset #2 id:80001 of https://codereview.chromium.org/1974773002/ )

Reason for revert:
Addressed link failure

Original issue's description:
> Revert of Remove v8_toolset_for_d8 flag (patchset #1 id:1 of https://codereview.chromium.org/1969793002/ )
>
> Reason for revert:
> blocks roll: https://codereview.chromium.org/1975753002/
>
> Original issue's description:
> > Remove v8_toolset_for_d8 flag
> >
> > R=machenbach@chromium.org
> > BUG=chromium:609107
> >
> > Committed: https://crrev.com/6cb38427984f3c31ff6c8813535cfd6ebf6058c4
> > Cr-Commit-Position: refs/heads/master@{#36198}
>
> TBR=machenbach@chromium.org,jochen@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=chromium:609107
>
> Committed: https://crrev.com/b33f9a6f24edef8447adcfb028b7f1d6e291c34e
> Cr-Commit-Position: refs/heads/master@{#36209}

TBR=machenbach@chromium.org,hablich@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:609107

Review-Url: https://codereview.chromium.org/1973363002
Cr-Commit-Position: refs/heads/master@{#36250}

BUG=v8:4280
LOG=N

Review-Url: https://codereview.chromium.org/1979523002
Cr-Commit-Position: refs/heads/master@{#36249}

By fully annotating the API with runtime counters we can properly measure
how much time we spend in total in v8. When --runtime-call-stats is specified
we now disable the fast-paths for callbacks to properly measure them.
As a drive-by-fix this CL unifies the LOG messages in api.cc.
Additionally we added missing timers to gain better resolution in the parser
and callbacks.

BUG=

Review-Url: https://codereview.chromium.org/1923893002
Cr-Commit-Position: refs/heads/master@{#36248}

Globally cached handler stubs shouldn't be put into the on-map caches.
This should speed up IC misses and save a bit of memory.

Drive-by fix: transitioning StoreIC handlers were erroneously never cached.

Review-Url: https://codereview.chromium.org/1974793002
Cr-Commit-Position: refs/heads/master@{#36247}

Allocation folding tests are failing in debug mode, since the change
https://codereview.chromium.org/1972553002 (6e15433d) introduced a debug check in
lithium-codegen-mips64.cc, line 5287.

Reason for failure is to be found in https://codereview.chromium.org/1899813003 (61f5fbbb),
which is missing changes calling LFastAllocate in lithium-mips64.cc.

BUG=

Review-Url: https://codereview.chromium.org/1977833002
Cr-Commit-Position: refs/heads/master@{#36246}

Adds a V8.Execute histogram to measure the amount of time spent executing
JS code.

BUG=v8:4865
LOG=N

Review-Url: https://codereview.chromium.org/1976963002
Cr-Commit-Position: refs/heads/master@{#36245}

BUG=chromium:609107
R=machenbach@chromium.org

Review-Url: https://codereview.chromium.org/1973903004
Cr-Commit-Position: refs/heads/master@{#36244}

Port 61f5fbbb
Port 6e15433d

Original commit message:

      The new allocation folding implementation avoids fragmentation between folded allocation.
      As a consequence, our heap will always be iterable i.e. we do not have to perform a
      garbage collection before iterating the heap.

R=hpayer@chromium.org, joransiu@ca.ibm.com, bjaideep@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/1973883003
Cr-Commit-Position: refs/heads/master@{#36243}

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1977843002
Cr-Commit-Position: refs/heads/master@{#36242}

Whenever tracing is activated we disable concurrent compilation. Hence
all tracing functions can safely dereference all handles. This fixes the
tracing functionality by annotating tracing functions with proper scopes.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1976123002
Cr-Commit-Position: refs/heads/master@{#36241}

R=mstarzinger@chromium.org
BUG=v8:4765

Review-Url: https://codereview.chromium.org/1976933002
Cr-Commit-Position: refs/heads/master@{#36240}

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

Review-Url: https://codereview.chromium.org/1980483002
Cr-Commit-Position: refs/heads/master@{#36239}

BUG=chromium:609249
LOG=NO

Review-Url: https://codereview.chromium.org/1976133002
Cr-Commit-Position: refs/heads/master@{#36238}

R=mstarzinger@chromium.org
BUG=v8:4765

Review-Url: https://codereview.chromium.org/1968423002
Cr-Commit-Position: refs/heads/master@{#36237}

Tweaks the generated code for a number of bytecode handlers. In particular, uses
deferred labels (now that they exist) to ensure that fast-paths don't build frames
where possible. This improves the codegen for StackCheck, Jump, Return and ForInNext.
Also tweak the codegen for CreateArguments, LogicalNot, ForInDone.

Seems to give ~5-8% performance boost on Octane.

BUG=v8:4280
LOG=N

Review-Url: https://codereview.chromium.org/1973873004
Cr-Commit-Position: refs/heads/master@{#36236}

Hidden prototypes are merely an implementation detail. Properties on an object + hidden prototype should look like properties on the object. Hence we should always perform a hidden prototype lookup. This CL removes the option to ignore hidden prototypes to avoid bugs that leak this implementation detail.

Also, the only previously valid cases were either places were we knew we didn't have a hidden prototype; or because we knew we (in the optimizing compiler) would only handle properties from the non-hidden object.The first case is already handled by directly tagging whether a receiver has a hidden prototype. In the second case we can just filter out properties from hidden prototypes.

Review-Url: https://codereview.chromium.org/1975763002
Cr-Commit-Position: refs/heads/master@{#36235}

Revert of Add V8.Execute histogram to measure time spent executing JS code. (patchset #1 id:1 of https://codereview.chromium.org/1974003002/ )

Reason for revert:
Blocks roll https://codereview.chromium.org/1972303002/

Repro:
- build chromium with this CL
- out/Default/content_browsertests --gtest_filter=AccessibilityHitTestingBrowserTest.HitTestingInIframes

Original issue's description:
> Add V8.Execute histogram to measure time spent executing JS code.
>
> Adds a V8.Execute histogram to measure the amount of time spent executing
> JS code.
>
> BUG=v8:4865
> LOG=N
>
> Committed: https://crrev.com/e8f5a2723cf54576b84322ac2ee6ef7abc9df056
> Cr-Commit-Position: refs/heads/master@{#36217}

TBR=cbruni@chromium.org,rmcilroy@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4865

Review-Url: https://codereview.chromium.org/1970193003
Cr-Commit-Position: refs/heads/master@{#36234}

Reland of [Reland] Implement CPU time for OS X and POSIX. (patchset #1 id:1 of https://codereview.chromium.org/1977753002/ )

Reason for revert:
Not the culprit sorry.

Original issue's description:
> Revert of [Reland] Implement CPU time for OS X and POSIX. (patchset #1 id:1 of https://codereview.chromium.org/1966183003/ )
>
> Reason for revert:
> Blocks roll: https://codereview.chromium.org/1972303002/
>
> Original issue's description:
> > [Reland] Implement CPU time for OS X and POSIX.
> >
> > V8 tracing controller uses 2 clocks: wall clock and cpu clock. This patch
> > implements CPU time for OS X and POSIX to provide more accurate
> > accounting of CPU time used by each thread.
> >
> > BUG=v8:4984
> > LOG=n
> >
> > Committed: https://crrev.com/efa27fb25e1fa5b8465f4af710086b73b0cba660
> > Cr-Commit-Position: refs/heads/master@{#36213}
>
> TBR=fmeawad@chromium.org,jochen@chromium.org,rsesek@chromium.org,bmeurer@chromium.org,lpy@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:4984
>
> Committed: https://crrev.com/31b9ba3bc8fb93601cc73c83213b30e639d448b3
> Cr-Commit-Position: refs/heads/master@{#36225}

TBR=fmeawad@chromium.org,jochen@chromium.org,rsesek@chromium.org,bmeurer@chromium.org,lpy@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4984

Review-Url: https://codereview.chromium.org/1976603005
Cr-Commit-Position: refs/heads/master@{#36233}

The data-structure in question is only used by Crankshaft, it can safely
be moved into the backend to avoid exposure through the CompilationInfo.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1977473002
Cr-Commit-Position: refs/heads/master@{#36232}

BUG=chromium:611688
LOG=Y
R=jochen@chromium.org

Review-Url: https://codereview.chromium.org/1978773002
Cr-Commit-Position: refs/heads/master@{#36231}

This completely removes any potential for a side-channel between the
various compiler backends and the profiler. The CompilationInfo is no
longer passed.

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/1970193002
Cr-Commit-Position: refs/heads/master@{#36230}

This makes the profiler reconstruct inlined function frames at eager
deopt points from the deoptimization data. The main goal of this is to
remove the last side-channel where Crankshaft communicates directly to
the profiler. This is the last preparatory step towards deprecating the
side-channel in question.

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/1973993002
Cr-Commit-Position: refs/heads/master@{#36229}

This is a first step to removing the support for the OldFunctions
section altogether, which will greatly simplify the encoder and remove
the need to do local variable remapping in asm->wasm.

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

Review-Url: https://codereview.chromium.org/1974933002
Cr-Commit-Position: refs/heads/master@{#36228}

This patch adds support for the `Operand2_R_LSL_I` addressing mode to
loads and stores. This allows merging a shift instruction into a
MemoryOperand. Since the shift immediate is restricted to the log2 of
the operation width, the opportunities to hit this are slim. However,
Ignition's bytecode handlers hit this case all the time:

kind = BYTECODE_HANDLER
name = Star
compiler = turbofan
Instructions (size = 44)
0x23e67280     0  add x1, x19, #0x1 (1)
0x23e67284     4  ldrsb x1, [x20, x1]
0x23e67288     8  sxtw x1, w1
0x23e6728c    12  mov x2, fp
0x23e67290    16  str x0, [x2, x1, lsl #3]
                  ^^^^^^^^^^^^^^^^^^^^^
0x23e67294    20  add x19, x19, #0x2 (2)
0x23e67298    24  ldrb w1, [x20, x19]
0x23e6729c    28  ldr x1, [x21, x1, lsl #3]
                  ^^^^^^^^^^^^^^^^^^^^^
0x23e672a0    32  br x1

Additionally, I noticed the optimisation occurs once in both the
`StringPrototypeCharAt` and `StringPrototypeCharCodeAt` turbofan stubs.

BUG=

Review-Url: https://codereview.chromium.org/1972103002
Cr-Commit-Position: refs/heads/master@{#36227}

R=cbruni@chromium.org

Review-Url: https://codereview.chromium.org/1974243002
Cr-Commit-Position: refs/heads/master@{#36226}

Revert of [Reland] Implement CPU time for OS X and POSIX. (patchset #1 id:1 of https://codereview.chromium.org/1966183003/ )

Reason for revert:
Blocks roll: https://codereview.chromium.org/1972303002/

Original issue's description:
> [Reland] Implement CPU time for OS X and POSIX.
>
> V8 tracing controller uses 2 clocks: wall clock and cpu clock. This patch
> implements CPU time for OS X and POSIX to provide more accurate
> accounting of CPU time used by each thread.
>
> BUG=v8:4984
> LOG=n
>
> Committed: https://crrev.com/efa27fb25e1fa5b8465f4af710086b73b0cba660
> Cr-Commit-Position: refs/heads/master@{#36213}

TBR=fmeawad@chromium.org,jochen@chromium.org,rsesek@chromium.org,bmeurer@chromium.org,lpy@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4984

Review-Url: https://codereview.chromium.org/1977753002
Cr-Commit-Position: refs/heads/master@{#36225}