port 9e37a07c (r38057)

  original commit message:

BUG=

Review-Url: https://codereview.chromium.org/2185363003
Cr-Commit-Position: refs/heads/master@{#38126}

R=neis@chromium.org
TEST=mjsunit/ignition/osr-from-generator
BUG=v8:4764

Review-Url: https://codereview.chromium.org/2188723005
Cr-Commit-Position: refs/heads/master@{#38125}

perf-turbo.py merges a perf data file and a turbofan trace file into a
single json object which can then be piped to a file and uploaded to
turbolizer to display the profiling data in the disassembly. With the
changes, turbolizer now shows the event counts for instruction in
percentage form and with heatmap-stype colouring. Multiple different
events can be recorded at once with a new drop-down menu to select which
event to view the counts of. The documentation has been updated with
instructions. Using the script is optional and turbolizer retains
previous functionality if a trace without profiling data is uploaded.

BUG=None

Review-Url: https://codereview.chromium.org/2174803002
Cr-Commit-Position: refs/heads/master@{#38124}

This reduces the size of GetStrongGcSubrootName() from 77 KB to 10KB.

BUG=5240

Review-Url: https://codereview.chromium.org/2189633003
Cr-Commit-Position: refs/heads/master@{#38123}

X87: Reland of [interpreter] Add explicit OSR polling bytecode. (patchset #1 id:1 of https://codereview.chromium.org/2184553003/ ).

  port e1ad114e (r38056)

  original commit message:
  Reason for revert:
  Fix has been landed.

  Original issue's description:
  > Revert of [interpreter] Add explicit OSR polling bytecode. (patchset #6 id:100001 of https://codereview.chromium.org/2172233002/ )
  >
  > Reason for revert:
  > Bunch of breakages. Maybe bad interaction with https://chromium.googlesource.com/v8/v8/+/e520e5da5550f0d1a975e87d6e66a2edecbb0c8e ?
  >
  > E.g.:
  > https://build.chromium.org/p/client.v8/builders/V8%20Linux64/builds/11607
  >
  > Original issue's description:
  > > [interpreter] Add explicit OSR polling bytecode.
  > >
  > > This adds an explicit {OsrPoll} bytecode into every loop header which
  > > triggers on-stack replacement when armed. Note that each such bytecode
  > > stores the static loop depths as an operand, and hence can be armed for
  > > specific loop depths.
  > >
  > > This also adds builtin code that triggers OSR compilation and switches
  > > execution over to optimized code in case compilation succeeds. In case
  > > compilation fails, the bytecode dispatch just continues unhindered.
  > >
  > > R=rmcilroy@chromium.org
  > > TEST=mjsunit/ignition/osr-from-bytecode
  > > BUG=v8:4764
  > >
  > > Committed: https://crrev.com/a55beb68e0ededb3773affa294a71edc50621458
  > > Cr-Commit-Position: refs/heads/master@{#38043}
  >
  > TBR=rmcilroy@chromium.org,mstarzinger@chromium.org
  > # Skipping CQ checks because original CL landed less than 1 days ago.
  > NOPRESUBMIT=true
  > NOTREECHECKS=true
  > NOTRY=true
  > BUG=v8:4764
  >
  > Committed: https://crrev.com/439aa2c6d708bfd95db725bd6f97c4c49bbc51fc
  > Cr-Commit-Position: refs/heads/master@{#38044}

BUG=

Review-Url: https://codereview.chromium.org/2190903002
Cr-Commit-Position: refs/heads/master@{#38122}

Use it like this:

Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 0x7f50d02c4700 (LWP 8152)]
base::debug::(anonymous namespace)::DebugBreak ()
    at ../../base/debug/debugger_posix.cc:230
230     }
(gdb) bt
    at ../../base/debug/debugger_posix.cc:230
...
    args_object=0x7f50d02bfe00, isolate=0x2f001c9e2020)
    at ../../v8/src/builtins/builtins-api.cc:123
...
(gdb) jss
(gdb) bt
    isolate=0x2f001c9e2020, is_construct=false, target=..., receiver=...,
    argc=1, args=0x7f50d02c0518, new_target=...)
    at ../../v8/src/execution.cc:111
    isolate=0x2f001c9e2020, callable=..., receiver=..., argc=1,
    argv=0x7f50d02c0518) at ../../v8/src/execution.cc:168
...

R=yangguo@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2186013002
Cr-Commit-Position: refs/heads/master@{#38121}

BUG=chromium:580337
TBR=yangguo@chromium.org, jochen@chromium.org, pfeldman@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2192563003
Cr-Commit-Position: refs/heads/master@{#38120}

  port ba092fb0 (r37971)

  original commit message:
  So far we don't have a useful way to inline Math.max or Math.min in
  TurboFan optimized code. This adds new operators NumberMax and NumberMin
  and changes the Float64Max/Float64Min operators to have JavaScript
  semantics instead of the C++ semantics that it had previously.

  This also removes support for recognizing the tenary case in the
  CommonOperatorReducer, since that doesn't seem to have any positive
  impact (and actually doesn't show up in regular JavaScript, where
  people use Math.max/Math.min instead).

BUG=

  Drive-by-fix: Also nuke the unused Float32Max/Float32Min operators.
Review-Url: https://codereview.chromium.org/2187463005

Cr-Commit-Position: refs/heads/master@{#38119}

If the input to a CheckString is already a String, then the check
is redundant.

R=epertoso@chromium.org

Review-Url: https://codereview.chromium.org/2190833002
Cr-Commit-Position: refs/heads/master@{#38118}

This is required for all executables.

BUG=chromium:580337
TBR=yangguo@chromium.org, jochen@chromium.org, pfeldman@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2183313007
Cr-Commit-Position: refs/heads/master@{#38117}

R=adamk@chromium.org
BUG=v8:5237

Review-Url: https://codereview.chromium.org/2188753002
Cr-Commit-Position: refs/heads/master@{#38116}

R=mvstanton@chromium.org

Review-Url: https://codereview.chromium.org/2190623002
Cr-Commit-Position: refs/heads/master@{#38115}

R=marja@chromium.org
BUG=v8:5215

Review-Url: https://codereview.chromium.org/2191443003
Cr-Commit-Position: refs/heads/master@{#38114}

The isolate_driver automatically adds referenced shared
libraries. They don't need to be listed explicitly.

The hard-coded location blocks the GN transition
as the library location is different in GYP and GN.

BUG=chromium:474921
NOTRY=true

Review-Url: https://codereview.chromium.org/2190543003
Cr-Commit-Position: refs/heads/master@{#38113}

BUG=

Review-Url: https://codereview.chromium.org/2182493006
Cr-Commit-Position: refs/heads/master@{#38112}

This adds the build target inspector_protocol_parser_test, which depends
on several more inspector protocol related targets. The resulting
gtest executable runs, but has failures that have to be fixed.

GN build configuration will follow.

A copy of v8-inspector/js_protocol.json has been included to be able to
use it before the actual migration.

BUG=chromium:580337

Review-Url: https://codereview.chromium.org/2184733002
Cr-Commit-Position: refs/heads/master@{#38111}

This patch updates internal data structures used by V8 to support
multiple indirect function tables (WebAssembly/design#682). But, since
this feature is post-MVP, the functionality is not directly exposed and
parsing/generation of WebAssembly is left unchanged. Nevertheless, it
is being used in an experiment to implement fine-grained control flow
integrity based on C/C++ types.

BUG=

Review-Url: https://codereview.chromium.org/2174123002
Cr-Commit-Position: refs/heads/master@{#38110}

Rolling v8/build to 0a8d7715646009e2d0935f72462c481be22c6de4

Rolling v8/tools/mb to 1d3f4544cadd78d89c8c71c37ef5474ac2b1e297

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

Review-Url: https://codereview.chromium.org/2191643003
Cr-Commit-Position: refs/heads/master@{#38109}

Revert of MIPS: Fix mksnapshot on big-endian. (patchset #3 id:40001 of https://codereview.chromium.org/2172653002/ )

Reason for revert:
Blocks the roll:
https://codereview.chromium.org/2189443003/

Doesn't work with the last chromium gyp bot.

Original issue's description:
> MIPS: Fix mksnapshot on big-endian.
>
> Paritally revert standalone.gypi changes in a451bd1a and introduce a new separate variable for the mkpeephole.
>
> On big-endian MIPS, qemu is used to build the snapshot,
> because there's no simulator support for big-endian MIPS.
>
> BUG=
>
> Committed: https://crrev.com/928d2395c3fdf836cf9961cde96e6b274a6b1e20
> Cr-Commit-Position: refs/heads/master@{#38103}

TBR=oth@chromium.org,machenbach@google.com,akos.palfi@imgtec.com
# 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/2182633010
Cr-Commit-Position: refs/heads/master@{#38108}

This removes the ability to directly access the {FunctionType} stored
within a {CallInterfaceDescriptor}. The field is in the process of being
deprecated and should no longer be accessed.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2191533002
Cr-Commit-Position: refs/heads/master@{#38107}

Introduce an appropriate StringCharCodeAt simplified operator and use
that to optimize the String.prototype.charCodeAt/.charAt builtins.

R=epertoso@chromium.org

Review-Url: https://codereview.chromium.org/2180373005
Cr-Commit-Position: refs/heads/master@{#38106}

This is intended to be submitted just after http://crrev.com/2174553002, which renames these builders.

BUG=590036
NOTRY=true

Review-Url: https://codereview.chromium.org/2181133002
Cr-Commit-Position: refs/heads/master@{#38105}

V8 has had a trace event macro interface for while, but without a tracing
controller a standalone V8 would be unable to collect traces.

This CL introduces a complete Tracing Controller system for V8.
It is fully function except that it does not yet store trace event args.

This CL has a few components,
The tracing controller itself, contributed by the author of this CL
The Trace config (including the parser), contributed by lpy@
The Trace Object, Trace Writer, and Trace Buffer are all contributed by rksang@

BUG=v8:4561
LOG=N

The original CL was failing the V8 Arm Builder:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Arm%20-%20builder/builds/2456
and the V8 Mips Builder:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Mips%20-%20builder/builds/2506

The failure is due to undefined behavior of CHECK_EQ of 2 const char*

Fix in patch #1

Committed: https://crrev.com/3d598452679ce208ad9b2f48e0fb3fae352ce375
Cr-Commit-Position: refs/heads/master@{#38073}

patch from issue 2137013006 at patchset 200001 (http://crrev.com/2137013006#ps200001)

Review-Url: https://codereview.chromium.org/2183923004
Cr-Commit-Position: refs/heads/master@{#38104}

Paritally revert standalone.gypi changes in a451bd1a and introduce a new separate variable for the mkpeephole.

On big-endian MIPS, qemu is used to build the snapshot,
because there's no simulator support for big-endian MIPS.

BUG=

Review-Url: https://codereview.chromium.org/2172653002
Cr-Commit-Position: refs/heads/master@{#38103}

Default icu data file for all architectures was set to icudtl.dat, for
big endian this should be icudtb.dat. This will fix intl tests for big
endian once v8 rolls to a newer version of icu that supports big endian.

BUG=
TEST=intl/*

Review-Url: https://codereview.chromium.org/2182043002
Cr-Commit-Position: refs/heads/master@{#38102}

Remove TODO to perform same optimization as AstGraphBuilder.
When visiting for effect in a postfix count operation, don't
keep the intermediate result of ToNumber.

BUG=v4:4280
LOG=n

Review-Url: https://codereview.chromium.org/2187823002
Cr-Commit-Position: refs/heads/master@{#38101}

BUG=v8:4280
LOG=N

Review-Url: https://codereview.chromium.org/2187713004
Cr-Commit-Position: refs/heads/master@{#38100}

All supported ARM targets support unaligned accesses for integer
accesses. This patch removes the remnants of support for older targets.

BUG=v8:5077

Review-Url: https://codereview.chromium.org/2184823002
Cr-Commit-Position: refs/heads/master@{#38099}

- Overhead for HashTable was not accounted in bytes
- Name table in typefeedback metadata changed

BUG=chromium:631094
R=hpayer@chromium.org

Review-Url: https://codereview.chromium.org/2190563002
Cr-Commit-Position: refs/heads/master@{#38098}

Review-Url: https://codereview.chromium.org/2187463003
Cr-Commit-Position: refs/heads/master@{#38097}

https://codereview.chromium.org/2176143002 removed parsing of a golden
file header option but did not remove the option.

BUG=
LOG=n

Review-Url: https://codereview.chromium.org/2189583002
Cr-Commit-Position: refs/heads/master@{#38096}

BUG=608675

Review-Url: https://codereview.chromium.org/2184073002
Cr-Commit-Position: refs/heads/master@{#38095}

Objects that reside below the age mark could be on pages that have been moved
within new space. In this case mementos survived which can actually point to
already-collected allocation sites.

BUG=chromium:631050,chromium:581412
R=hpayer@chromium.org

Review-Url: https://codereview.chromium.org/2179033005
Cr-Commit-Position: refs/heads/master@{#38094}

Inline XxxIC::initialize_stub_in_optimized_code() methods to CodeFactory and use stub's call interface descriptor instead of hard-coded one.

BUG=v8:5236

Review-Url: https://codereview.chromium.org/2184063002
Cr-Commit-Position: refs/heads/master@{#38093}

Revert of [gn] Don't use PIE for host executables (patchset #2 id:20001 of https://codereview.chromium.org/2179303003/ )

Reason for revert:
Breaks roll: https://codereview.chromium.org/2182043004/

Original issue's description:
> [gn] Don't use PIE for host executables
>
> Using PIE switches on ASLR. With mksnapshot, this can lead
> to non-deterministic snapshots.
>
> BUG=v8:5233
>
> Committed: https://crrev.com/4ca39b53245619d94a80a93939613774e68e4649
> Cr-Commit-Position: refs/heads/master@{#38084}

TBR=jochen@chromium.org,vogelheim@chromium.org,yangguo@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5233

Review-Url: https://codereview.chromium.org/2187613003
Cr-Commit-Position: refs/heads/master@{#38092}

This leads to a better handling of the Smi case when we introduce a checked truncation from a number or oddbal to a 32 bit word, which we were previously doing by concatenating a Smi to float64 conversion with a float64 to word32 truncation.

BUG=

Review-Url: https://codereview.chromium.org/2191503002
Cr-Commit-Position: refs/heads/master@{#38091}

Port 52f2ceb0

Original commit message:
On MIPS different signaling NaN values must be used for hardware and simulator targets, even at snapshot generation when always simulator is used.

This introduces SilenceNaN operator, which makes sure that we only
store quiet NaNs into holey arrays. We omit the NaN silencing code
at instruction selection time if the input is an operation that
cannot possibly produce signalling NaNs.

BUG=
TEST=mjsunit/compiler/regress-store-holey-double-array

Review-Url: https://codereview.chromium.org/2188433002
Cr-Commit-Position: refs/heads/master@{#38090}

This prepares for https://codereview.chromium.org/2188693002/

With the current configuration, sanitizers wouldn't be used
at all. The clang configuration is automatically derived
in GN.

BUG=chromium:474921
NOTRY=true

Review-Url: https://codereview.chromium.org/2184683004
Cr-Commit-Position: refs/heads/master@{#38089}

Also run the BranchElimination (plus CommonOperatorReducer and the
DeadCodeElimination) during the load elimination phase, so we can
elminate some Phi nodes early on that would otherwise confuse the
truncation analysis and/or representation selection, i.e. if there's a
branch that is never taken, that would yield undefined, we'd have to
choose tagged representation for the Phi, even if the always taken
branch yields an integer.

R=epertoso@chromium.org
BUG=v8:4930,v8:5141

Review-Url: https://codereview.chromium.org/2190543002
Cr-Commit-Position: refs/heads/master@{#38088}

R=marja@chromium.org
BUG=chromium:621361

Review-Url: https://codereview.chromium.org/2185913003
Cr-Commit-Position: refs/heads/master@{#38087}