This removes a restriction from full-codegen that limited the usability
of the --debug-code flag to only no-snap configurations. The reasoning
for the restriction would still hold, if we ever put full-codegen code
into the snapshot, which we don't. Also there already are several places
in full-codegen that queried the FLAG_debug_code directly, a more
reliable mechanism will be needed if we snapshot full code.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1722593002

Cr-Commit-Position: refs/heads/master@{#34189}

BUG=chromium:587574
LOG=NO

Review URL: https://codereview.chromium.org/1705183003

Cr-Commit-Position: refs/heads/master@{#34188}

The InstructionSelector now associates an effect level to every node in a block.

The effect level of a node is the number of non-eliminatable nodes encountered from the beginning of the block to the node itself.

With this change, on ia32 and x64, a load from memory into a register can be replaced by a memory operand if all of the following conditions hold:

1. The only use of the load is in a 32 or 64 bit word comparison.
2. The user node and the load node belong to the same block.
3. The values of the operands have the same size (i.e., no need to zero-extend or sign-extend the result of the load).

BUG=

Review URL: https://codereview.chromium.org/1706763002

Cr-Commit-Position: refs/heads/master@{#34187}

BUG=

Review URL: https://codereview.chromium.org/1718953002

Cr-Commit-Position: refs/heads/master@{#34186}

BUG= https://code.google.com/p/v8/issues/detail?id=4203
TEST=mjsunit/asm-wasm
R=aseemgarg@chromium.org,titzer@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1720773002

Cr-Commit-Position: refs/heads/master@{#34185}

Rolling v8/third_party/icu to e466f6ac8f60bb9697af4a91c6911c6fc4aec95f

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

Review URL: https://codereview.chromium.org/1715283002

Cr-Commit-Position: refs/heads/master@{#34184}

  The CL #33996 (https://codereview.chromium.org/1695283002) exposed one hidden bug in x87 crankshaft code generation for LCodeGen::DoMathMinMax().

  This CL fixed this bug.

BUG=

Review URL: https://codereview.chromium.org/1715263002

Cr-Commit-Position: refs/heads/master@{#34183}

  port ba2077aa (r34136)

  original commit message:
  Move the already existing fast case for %NewObject into a dedicated
  FastNewObjectStub that we can utilize in places where we would otherwise
  fallback to %NewObject immediately, which is rather expensive.

  Also use FastNewObjectStub as the generic implementation of JSCreate,
  which should make constructor inlining based on SharedFunctionInfo (w/o
  specializing to a concrete closure) viable soon.

BUG=

Review URL: https://codereview.chromium.org/1717203002

Cr-Commit-Position: refs/heads/master@{#34182}

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

Review URL: https://codereview.chromium.org/1717993002

Cr-Commit-Position: refs/heads/master@{#34181}

Embedders don't use d8.cc.  Move gdbjit initialization to api.cc.

BUG=

Review URL: https://codereview.chromium.org/1710253002

Cr-Commit-Position: refs/heads/master@{#34180}

Rolling v8/tools/clang to a8adb78c8eda9bddb2aa9c51f3fee60296de1ad4

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

Review URL: https://codereview.chromium.org/1717953002

Cr-Commit-Position: refs/heads/master@{#34179}

Up until now we were unable to (re)optimize code when we hit
uninitialized (Keyed)Load/StoreICs in the code. We always put an IC
there (sharing the feedback vector with fullcodegen at least) and called
it a day. But we never deoptimized the code object when we gathered more
feedback. This doesn't work very well in practice, esp. with hot code
relying on this. So until we have a proper mechanism to express the need
to reoptimize after we gathered additional feedback from optimized code,
we follow the Crankshaft approach instead and install a SOFT deopt, so
we can not only learn but also utilize the new feedback.

R=mstarzinger@chromium.org
BUG=v8:4470
LOG=n

Review URL: https://codereview.chromium.org/1518013002

Cr-Commit-Position: refs/heads/master@{#34178}

Slots filtering of left-trimmed arrays assume that two-pointer fillers are not marked.

BUG=chromium:585787
LOG=NO
TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1720623002

Cr-Commit-Position: refs/heads/master@{#34177}

BUG=

Review URL: https://codereview.chromium.org/1522573002

Cr-Commit-Position: refs/heads/master@{#34176}

WASM compiler test will sometimes generate invalid instructions for
DINS/INS.

BUG=

Review URL: https://codereview.chromium.org/1709633004

Cr-Commit-Position: refs/heads/master@{#34175}

Most libraries use `JSON.stringify` with all three arguments [1] to allow for
configuration, even if `replacer` and `space` are falsey, causing the
optimized native stringifying to be missed. This commit allows for the common
case where `replacer` and `space` are not used to be fast.

[1]: https://github.com/hapijs/hapi/pull/3014

BUG=v8:4730
LOG=N

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1710933002

Cr-Commit-Position: refs/heads/master@{#34174}

Rolling v8/tools/clang to 50fc8b6e785aa002218d67b78db871b21b1c9d71

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

Review URL: https://codereview.chromium.org/1710263004

Cr-Commit-Position: refs/heads/master@{#34173}

This was changed to match Annex B.2.5.1 of ES2015 and Firefox in
https://chromium.googlesource.com/v8/v8/+/469d9bfa, but website
breakage was seen in M49 Beta. JSC still returns undefined here.

BUG=chromium:585775
LOG=y
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1714903004

Cr-Commit-Position: refs/heads/master@{#34172}

This was previously reverted due to breakage in devtools, but that has
been worked around in https://codereview.chromium.org/1666573002.

The feature has been publicly-announced as deprecated for several months,
and Chrome 49 will emit deprecation warnings in the console for
uses of the API. This CL aims to remove it from M50 (which is what the
message warns of).

BUG=chromium:552100
LOG=y
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1711863003

Cr-Commit-Position: refs/heads/master@{#34171}

This is a rework of the instanceof operator to support ES6 semantics
(as per section 12.10.4 of the spec:
https://tc39.github.io/ecma262/#sec-instanceofoperator).

It's behind flag --harmony-instanceof for now, which is turned on for staging.

BUG=v8:4447
LOG=N

Review URL: https://codereview.chromium.org/1692713005

Cr-Commit-Position: refs/heads/master@{#34170}

Port ba2077aa

Original commit message:
    Move the already existing fast case for %NewObject into a dedicated
    FastNewObjectStub that we can utilize in places where we would otherwise
    fallback to %NewObject immediately, which is rather expensive.

    Also use FastNewObjectStub as the generic implementation of JSCreate,
    which should make constructor inlining based on SharedFunctionInfo (w/o
    specializing to a concrete closure) viable soon.

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

Review URL: https://codereview.chromium.org/1714123002

Cr-Commit-Position: refs/heads/master@{#34169}

BUG=559304
LOG=N

Review URL: https://codereview.chromium.org/1709873002

Cr-Commit-Position: refs/heads/master@{#34168}

This new callback is similar to CallCompletedCallback, but is executed before the call has been made.
Added Isolate* parameter to CallCompletedCallback, marking previous one as deprecated.

BUG=chromium:585949
LOG=Y

Review URL: https://codereview.chromium.org/1689863002

Cr-Commit-Position: refs/heads/master@{#34167}

Adds a profiling counter to each BytecodeArray object, and adds
code to Jump and Return bytecode handlers to update this
counter by the size of the jump or the distance from the return
to the start of the function. This is more accurate than fullcodegen's
approach since it takes forward jumps into account as well as back-edges.

Modifies RuntimeProfiler to track ticks for interpreted frames.
Currently we use the SharedFunctionInfo::profiler_ticks() instead
of adding another to tick field to avoid adding another field to
BytecodeArray since SharedFunctionInfo::profiler_ticks() is only
used by Crankshaft otherwise so we shouldn't need both for

BUG=v8:4689
LOG=N

Review URL: https://codereview.chromium.org/1707693003

Cr-Commit-Position: refs/heads/master@{#34166}

We cannot omit flag check with kPointersToHereAreInterestingMask for maps because incremental marker dynamically sets and clears the flag.

BUG=chromium:587004
LOG=NO

Review URL: https://codereview.chromium.org/1714513003

Cr-Commit-Position: refs/heads/master@{#34165}

--pool-type=int and double have now been merged into number.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1717633002

Cr-Commit-Position: refs/heads/master@{#34164}

BUG=

Review URL: https://codereview.chromium.org/1711813003

Cr-Commit-Position: refs/heads/master@{#34163}

of non-pattern expressions, according to the (internally circulated)
design document.  Details to be provided here.

1.  RewritableAssignmentExpression has been renamed to RewritableExpression.
    It is a wrapper for AST nodes that wait for some potential rewriting
    (that may or may not happen).  Also, Is... and As... macros now see
    through RewritableExpressions.

2.  The function state keeps a list of rewritable expressions that must be
    rewritten only if they are used as non-pattern expressions.

3.  Expression classifiers are now templates, parameterized by parser
    traits.  They keep some additional state: a pointer to the list of
    non-pattern rewritable expressions.  It is important that expression
    classifiers be used strictly in a stack fashion, from now on.

4.  The RewriteNonPattern function has been simplified.

BUG=chromium:579913
LOG=N

Committed: https://crrev.com/7f5c864a6faf2b957b7273891e143b9bde35487c
Cr-Commit-Position: refs/heads/master@{#34154}

Review URL: https://codereview.chromium.org/1702063002

Cr-Commit-Position: refs/heads/master@{#34162}

R=ofrobots@google.com
BUG=

Review URL: https://codereview.chromium.org/1712893002

Cr-Commit-Position: refs/heads/master@{#34161}

FLAG_legacy_const and FLAG_harmony_do_expressions can now be toggled
both through the command line and through the option header.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1716793002

Cr-Commit-Position: refs/heads/master@{#34160}

Another attempt, after the failing test (flushed bug) has been disabled
in chromium (https://codereview.chromium.org/1710353002).

Review URL: https://codereview.chromium.org/1713033002

Cr-Commit-Position: refs/heads/master@{#34159}

Revert of Non-pattern rewriting revisited (patchset #3 id:40001 of https://codereview.chromium.org/1702063002/ )

Reason for revert:
[Sheriff] This makes jsfunfuzz unhappy:
https://build.chromium.org/p/client.v8/builders/V8%20Fuzzer/builds/7681

Original issue's description:
> This patch implements an alternative approach to the rewriting
> of non-pattern expressions, according to the (internally circulated)
> design document.  Details to be provided here.
>
> 1.  RewritableAssignmentExpression has been renamed to RewritableExpression.
>     It is a wrapper for AST nodes that wait for some potential rewriting
>     (that may or may not happen).  Also, Is... and As... macros now see
>     through RewritableExpressions.
>
> 2.  The function state keeps a list of rewritable expressions that must be
>     rewritten only if they are used as non-pattern expressions.
>
> 3.  Expression classifiers are now templates, parameterized by parser
>     traits.  They keep some additional state: a pointer to the list of
>     non-pattern rewritable expressions.  It is important that expression
>     classifiers be used strictly in a stack fashion, from now on.
>
> 4.  The RewriteNonPattern function has been simplified.
>
> BUG=chromium:579913
> LOG=N
>
> Committed: https://crrev.com/7f5c864a6faf2b957b7273891e143b9bde35487c
> Cr-Commit-Position: refs/heads/master@{#34154}

TBR=rossberg@chromium.org,bmeurer@chromium.org,titzer@chromium.org,nikolaos@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:579913

Review URL: https://codereview.chromium.org/1712203002

Cr-Commit-Position: refs/heads/master@{#34158}

This CL introduces an import section that names functions to be imported
as well as a CallImport bytecode to call imports from this table.

R=binji@chromium.org,bradnelson@chromium.org
LOG=Y
BUG=chromium:575167

Review URL: https://codereview.chromium.org/1709653002

Cr-Commit-Position: refs/heads/master@{#34157}

Extract the logic to find out the best candidate out of the core of the
scheduler. It allows more flexibility and make it easy to change the
policy use to schedule the basic blocks.

This patch also provide a new algorithm to randomly schedule the code
in order to perform stress tests on the scheduler.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1714753004

Cr-Commit-Position: refs/heads/master@{#34156}

This experimentally implements taring/untaring the test data
for test262 on the v8-side before test isolation and when
running the tests.

It archives on demand only if the tar is outdated compared
to the contained files. This comes with a cost of ~1s extra
to run gyp on linux and ~6s extra on windows. Ninja is
lightning fast afterwards in detecting changes. Also, we
archive only when test_isolation_mode is set and when
the test262_run target is required.

The archiving itself costs ~30s on all platforms. But as the
files will change seldom this shouldn't have a big impact.

Extraction on the test runner side is below 2s on mac and
linux. The speedup is enormous. Around 5 minutes were spent
on download on swarming slaves before, which is now only
a few seconds. So total test time for release (no variants),
e.g. goes from 8 to 3 minutes.

BUG=chromium:535160
LOG=n

Review URL: https://codereview.chromium.org/1713993002

Cr-Commit-Position: refs/heads/master@{#34155}

of non-pattern expressions, according to the (internally circulated)
design document.  Details to be provided here.

1.  RewritableAssignmentExpression has been renamed to RewritableExpression.
    It is a wrapper for AST nodes that wait for some potential rewriting
    (that may or may not happen).  Also, Is... and As... macros now see
    through RewritableExpressions.

2.  The function state keeps a list of rewritable expressions that must be
    rewritten only if they are used as non-pattern expressions.

3.  Expression classifiers are now templates, parameterized by parser
    traits.  They keep some additional state: a pointer to the list of
    non-pattern rewritable expressions.  It is important that expression
    classifiers be used strictly in a stack fashion, from now on.

4.  The RewriteNonPattern function has been simplified.

BUG=chromium:579913
LOG=N

Review URL: https://codereview.chromium.org/1702063002

Cr-Commit-Position: refs/heads/master@{#34154}

Track whether the Object.assign source is stable with a bool rather than map-check on each iteration.

BUG=

Review URL: https://codereview.chromium.org/1704363004

Cr-Commit-Position: refs/heads/master@{#34153}

A few options and features have been added to the tool:

* an output file might be specified using --output=file.name
* a shortcut when the output file is also the input, which is handy
   when fixing golden files, --rebaseline.
* the input snippet might be optionally not wrapped in a top function,
   or not executed after compilation (--no-wrap and --no-execute).
* the name of the wrapper can be configured using --wrapper-name=foo

The same options can be configured via setters on the usual
BytecodeExpectationsPrinter.

The output file now includes all the relevant flags to reproduce it
when running again through the tool (usually with --rebaseline).

In particular, when running in --rebaseline mode, options from the
file header will override options specified in the command line.

A couple of other fixes and improvements:

* description of the handlers is now emitted (closing the TODO).
* the snippet is now correctly unquoted when double quotes are used.
* special registers (closure, context etc.) are now emitted as such,
   instead of displaying their numeric value.
* the tool can now process top level code as well.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1698403002

Cr-Commit-Position: refs/heads/master@{#34152}

ArchStackPointer operation should not be reordered with respect to instructions
which can modify the stack layout.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1716543004

Cr-Commit-Position: refs/heads/master@{#34151}

BUG=

Review URL: https://codereview.chromium.org/1715543003

Cr-Commit-Position: refs/heads/master@{#34150}