When working on the register allocator, I often need to introspect the various components of the model - e.g. InstructionSequence, Instruction, LiveRange, etc. A pretty printer would help. While we have a suite of operator<< defined for these types, turns out that using them at debug time is close to impossible - gdb has poor (or convoluted) support for instantiating structures (e.g. OFStream, PrintableInstructionSequence, etc), and calling operator<< with pass-by-reference semantics.

I explored gdb macros, but hit an issue quite early with instantiating and initializing an OFStream - "virtual baseclass botch".

Currently, I have a side-file that I include (and then remove before publishing CLs), which defines wrappers to the above operator<< APIs, but this is becoming quite awkward, and I believe the functionality to be quite useful to anyone working in this (regalloc) area, so it's worth having something better than local side-files. The gdb path seems overly-twisted for the problem at hand, and I've noticed elsewhere (e.g. Object) the presence of Print APIs - hence this change.

BUG=

Review URL: https://codereview.chromium.org/1280483002

Cr-Commit-Position: refs/heads/master@{#30039}

It was shipped in V8 4.4.

Review URL: https://codereview.chromium.org/1273543002

Cr-Commit-Position: refs/heads/master@{#30038}

Also remove obsolete reference to harmony/object-observe in deopt fuzzer
skip section.

BUG=chromium:478788
LOG=n
TBR=vogelheim@chromium.org

Review URL: https://codereview.chromium.org/1272193004 .

Cr-Commit-Position: refs/heads/master@{#30037}

The code previously used a relative timeout and accumulated wait times to see
if the timeout was exceeded. Now we convert the timeout into an absolute time,
and always compare the current time against that.

BUG=v8:4357
R=machenbach@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1272733002

Cr-Commit-Position: refs/heads/master@{#30036}

It was shipped in V8 4.4.

Review URL: https://codereview.chromium.org/1271073002

Cr-Commit-Position: refs/heads/master@{#30035}

These flags weren't doing any real work, since the decision of whether some
source code is a script or module is made outside the parser (currently,
by the V8 API).

The only behavior change in this patch is to always parse 'import' and
'export' as their Token values, which changes the error message from
"Unexpected reserved word" to "Unexpected token import" (which doesn't
seem particularly harmful).

Review URL: https://codereview.chromium.org/1262913003

Cr-Commit-Position: refs/heads/master@{#30034}

BUG=v8:3956
LOG=N

Review URL: https://codereview.chromium.org/1270393002

Cr-Commit-Position: refs/heads/master@{#30033}

BUG=v8:3956
LOG=N

Review URL: https://codereview.chromium.org/1270423003

Cr-Commit-Position: refs/heads/master@{#30032}

BUG=

Review URL: https://codereview.chromium.org/1269343002

Cr-Commit-Position: refs/heads/master@{#30031}

TEST=test/intl/string/normalization
BUG=v8:4303
LOG=N

Review URL: https://codereview.chromium.org/1274653002

Cr-Commit-Position: refs/heads/master@{#30030}

This is only an estimate since it counts objects that could be shared,
for example strings, cow arrays, heap numbers, etc.

It however ignores objects that could be shared, but may only be used
by the context to be measured, for example shared function infos,
script objects, scope infos, etc.

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/1268333004

Cr-Commit-Position: refs/heads/master@{#30029}

With the recent changes to the incremental marking API we can now kick off
incremental marking while respecting callback flags.

Performance neutral for smoothness.image_decoding_cases on N9 (read: does not
crash) as long as we synchronously process phantom callbacks
(kGCCallbackFlagForced).

OORT single run:
  "marksweep": {
    "count": 5,
    "pause_min": 7.5,
    "pause_max": 158.8,
    "pause_avg": 97.52000000000001,
    "pause_gt_10ms": 4
  }
  --- vs ---
  "marksweep": {
    "count": 5,
    "pause_min": 16.2,
    "pause_max": 22.1,
    "pause_avg": 19.32,
    "pause_gt_10ms": 5
  }

The number of actual full GCs varies. The improvement manifests in reduced
maximum and average pauses.

BUG=chromium:515795
LOG=N

Review URL: https://codereview.chromium.org/1271253002

Cr-Commit-Position: refs/heads/master@{#30028}

BUG=chromium:507211
LOG=n

Review URL: https://codereview.chromium.org/1226773003

Cr-Commit-Position: refs/heads/master@{#30027}

The heuristic can cause weird behavior when bootstrapping.
The memory savings is not worth this hassle.

Committed: https://crrev.com/fc80f29a582b758d14aae864232624ca45e47ddc
Cr-Commit-Position: refs/heads/master@{#30019}

Review URL: https://codereview.chromium.org/1265983006

Cr-Commit-Position: refs/heads/master@{#30026}

Previously, examples like (({a = x}, x) => {})({}, 0) did not throw a ReferenceError like they should. This CL

- Splits up DeclareFormalParameters such that the formals can be recorded first and declared later.

- Declaration then takes the complete parameter list into account. If it is not simple, temporaries are introduced for all parameters.

- BuildParameterInitializationBlock desugars all parameters from non-simple lists into let-bindings.

- Refactored Pre/ParserFormalParameters, so that the arity information is no longer duplicated in Parser.

- Rest is currently handled specially, until rest-via-destructuring has landed.

R=adamk@chromium.org, littledan@chromium.org
BUG=v8:811
LOG=N

Review URL: https://codereview.chromium.org/1259283002

Cr-Commit-Position: refs/heads/master@{#30025}

Revert of Remove serializer-specific hash table size heuristic. (patchset #1 id:1 of https://codereview.chromium.org/1265983006/ )

Reason for revert:
This still breaks: https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/builds/1296/steps/Mjsunit/logs/load-proxy

Test: mjsunit/strong/load-proxy
Flags: --stress-opt --always-opt
Command: out/Debug/d8 --test --random-seed=2021532800 --stress-opt --always-opt --nohard-abort --nodead-code-elimination --nofold-constants --enable-slow-asserts --debug-code --verify-heap --harmony-proxies --strong-mode test/mjsunit/strong/load-proxy.js --gc-interval=500 --stress-compaction --concurrent-recompilation-queue-length=64 --concurrent-recompilation-delay=500 --concurrent-recompilation

Run #1
Exit code: -11
Result: CRASH
Expected outcomes: PASS
Duration: 00:00:553

Run #2
Exit code: -11
Result: CRASH
Expected outcomes: PASS
Duration: 00:00:520

Run #3
Exit code: -11
Result: CRASH
Expected outcomes: PASS
Duration: 00:00:572

Original issue's description:
> Remove serializer-specific hash table size heuristic.
>
> The heuristic can cause weird behavior when bootstrapping.
> The memory savings is not worth this hassle.
>
> Committed: https://crrev.com/fc80f29a582b758d14aae864232624ca45e47ddc
> Cr-Commit-Position: refs/heads/master@{#30019}

TBR=ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1268413002

Cr-Commit-Position: refs/heads/master@{#30024}

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1269323003

Cr-Commit-Position: refs/heads/master@{#30023}

Revert of Revert part of "Remove serializer-specific hash table size heuristic." (patchset #1 id:1 of https://codereview.chromium.org/1272123002/ )

Reason for revert:
Did not fix issue it was intended to fix.

Original issue's description:
> Revert part of "Remove serializer-specific hash table size heuristic."
>
> TBR=machenbach@chromium.org
> NOTRY=true
> NOTREECHECKS=true
>
> Committed: https://crrev.com/68e5ae5282f3ba787c27ffa6e92fed6e5ff725e4
> Cr-Commit-Position: refs/heads/master@{#30021}

TBR=machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1276443002

Cr-Commit-Position: refs/heads/master@{#30022}

TBR=machenbach@chromium.org
NOTRY=true
NOTREECHECKS=true

Review URL: https://codereview.chromium.org/1272123002

Cr-Commit-Position: refs/heads/master@{#30021}

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1256283003

Cr-Commit-Position: refs/heads/master@{#30020}

The heuristic can cause weird behavior when bootstrapping.
The memory savings is not worth this hassle.

Review URL: https://codereview.chromium.org/1265983006

Cr-Commit-Position: refs/heads/master@{#30019}

Rolling v8/tools/clang to c9a343c6a8065127989a05fe2a3fc76c26ad8102

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1274553002

Cr-Commit-Position: refs/heads/master@{#30018}

To avoid tanking context startup performance, only the actual installation of the
JS-exposed API is flag-guarded. The remainder of the implementation still
resides in the snapshot.

Review URL: https://codereview.chromium.org/1257063003

Cr-Commit-Position: refs/heads/master@{#30017}

BUG=4399
R=jarin@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1260813008

Cr-Commit-Position: refs/heads/master@{#30016}

BUG=

Review URL: https://codereview.chromium.org/1267313002

Cr-Commit-Position: refs/heads/master@{#30015}

Combines:
* https://codereview.chromium.org/1273483002/
* https://codereview.chromium.org/1266793003/

This reverts commit 0215fb56.

BUG=

Review URL: https://codereview.chromium.org/1265273002

Cr-Commit-Position: refs/heads/master@{#30014}

BUG=v8:3887
LOG=y

Review URL: https://codereview.chromium.org/1267773009

Cr-Commit-Position: refs/heads/master@{#30013}

This introduces a CopyFixedArrayAndGrow method on Factory that takes
the "grow amount" instead of the "new size" as an argument. The new
interface is safer because it allows for mutations by the GC that
potentially trim the source array.

This also fixes a bug in SharedFunctionInfo::AddToOptimizedCodeMap
where the aformentioned scenario led to unused entries within the
optimized code map.

Note that FixedArray::CopySize is hereby deprecated because it is
considered unsafe and should no longer be used.

R=hpayer@chromium.org
TEST=mjsunit/regress/regress-crbug-513507
BUG=chromium:513507
LOG=n

Review URL: https://codereview.chromium.org/1255173006

Cr-Commit-Position: refs/heads/master@{#30012}

Revert of GC: Refactor public incremental marking interface in heap (patchset #6 id:100001 of https://codereview.chromium.org/1273483002/ )

Reason for revert:
Fails on the MSAN builder:

http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/builds/3580/steps/Check/logs/RegExpInterruption

Likely due to lack of initialization of IncrementalMarking::gc_callback_flags_.

Original issue's description:
> GC: Refactor incremental marking interface from heap
>
> BUG=
>
> Committed: https://crrev.com/c9fcaeb336919ce4b76fded8c8059457e9820250
> Cr-Commit-Position: refs/heads/master@{#30009}

TBR=ulan@chromium.org,hpayer@chromium.org,mlippautz@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1271823006

Cr-Commit-Position: refs/heads/master@{#30011}

BUG=v8:3887
LOG=n

Review URL: https://codereview.chromium.org/1259183005

Cr-Commit-Position: refs/heads/master@{#30010}

BUG=

Review URL: https://codereview.chromium.org/1273483002

Cr-Commit-Position: refs/heads/master@{#30009}

BUG=chromium:516425
LOG=NO

Review URL: https://codereview.chromium.org/1271973002

Cr-Commit-Position: refs/heads/master@{#30008}

BUG=

Review URL: https://codereview.chromium.org/1259613006

Cr-Commit-Position: refs/heads/master@{#30007}

TBR=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1264233005

Cr-Commit-Position: refs/heads/master@{#30006}

Setting up the stage for heuristics that preprocess live ranges before register allocation, and are independent of register allocation - e.g. the deferred blocks heuristic, or the split at call sites heuristic.

Added a separate flag for this, since we intend to enable it for the linear allocator as well. Currently, the option is "on" for greedy, as a point in time to enable its testing (through the greedy allocator bots).

BUG=

Review URL: https://codereview.chromium.org/1256313003

Cr-Commit-Position: refs/heads/master@{#30005}

Change IS_SIMD_OBJECT to IS_SIMD_VALUE, and IsSimdObject to IsSimdValue.

R=rossberg
LOG=N
BUG=v8:4124

Review URL: https://codereview.chromium.org/1253103006

Cr-Commit-Position: refs/heads/master@{#30004}

The race occurred when Workers were used. Since Workers call
Shell::ExecuteString from a different thread, TSAN (correctly) flags
this as a racy write. Solution would be to either synchronize the writes,
or to 'lift' the write higher up in the call stack and only write the flag
from the main thread. This implements this latter solution.

These methods call Shell::ExecuteString, but do *not* set script_executed:
- ExecuteInThread: Can only occur is JS has already been executed.
- Shell::Load: Callback for JS; so JS has already been executed when
               we get there.
- Shell::RunShell: Interactive shell. We no longer need script_executed once
                   we're here.

BUG=v8:4330
LOG=N

Review URL: https://codereview.chromium.org/1258303004

Cr-Commit-Position: refs/heads/master@{#30003}

Store arity in FormalParameters; store name (instead of var) and is_rest flag in individual parameters. Ensure that the arity is always maintained consistently.

This is preparation for more parameter destructuring adjustments. In particular, a follow-up CL will separate parameter recording from declaring the variables.

R=adamk@chromium.org, littledan@chromium.org
BUG=v8:811
LOG=N

Review URL: https://codereview.chromium.org/1259013003

Cr-Commit-Position: refs/heads/master@{#30002}

TBR=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1263043004

Cr-Commit-Position: refs/heads/master@{#30001}

Revert of Remove serializer-specific hash table size heuristic. (patchset #1 id:1 of https://codereview.chromium.org/1265983006/ )

Reason for revert:
https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20gc%20stress/builds/3088/steps/Mjsunit/logs/load-proxy

Original issue's description:
> Remove serializer-specific hash table size heuristic.
>
> The heuristic can cause weird behavior when bootstrapping.
> The memory savings is not worth this hassle.
>
> Committed: https://crrev.com/a246e296c6366dcd0a2d8aa0df973d57093178f6
> Cr-Commit-Position: refs/heads/master@{#29992}

TBR=ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1257873006

Cr-Commit-Position: refs/heads/master@{#30000}