This moves the Hydrogen-specific {is_tracking_positions} predicate which
also depends on the --hydrogen-track-positions flag into the Crankshaft
directory and removes it from the more general {CompilationInfo}.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2377283002
Cr-Commit-Position: refs/heads/master@{#39913}

R=hpayer@chromium.org
TEST=test-heap/Regress598319

Review-Url: https://codereview.chromium.org/2381493004
Cr-Commit-Position: refs/heads/master@{#39912}

Review-Url: https://codereview.chromium.org/2385653002
Cr-Commit-Position: refs/heads/master@{#39911}

It was meant to be recursive.

BUG=

Review-Url: https://codereview.chromium.org/2381283002
Cr-Commit-Position: refs/heads/master@{#39910}

Revert "[inspector] added inspector test runner [part 1]"

This reverts commit dc1c71c0.

Revert "[inspector] added inspector test runner [part 2]"

This reverts commit cceaa122.

Blocks the roll:
https://codereview.chromium.org/2379053003/

In particular android debug:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clang_dbg_recipe/builds/137605

BUG=chromium:635948
TBR=kozyatinskiy@chromium.org,
NOTRY=true

Review-Url: https://codereview.chromium.org/2387603002
Cr-Commit-Position: refs/heads/master@{#39909}

Revert "[inspector] added inspector test runner [part 3]"

This reverts commit f3f9f444.

Revert "[inspector] added inspector test runner [part 4]"

This reverts commit 4a5f5d09.

Revert "[inspector] added inspector test runner [part 5]"

This reverts commit 9ddbdab1.

Reverting this in order to revert parts 1-2 which block the roll:
https://codereview.chromium.org/2379053003/

BUG=chromium:635948
TBR=kozyatinskiy@chromium.org,
NOTRY=true

Review-Url: https://codereview.chromium.org/2379303002
Cr-Commit-Position: refs/heads/master@{#39908}

Seems to be pretty perf-neutral (for the benchmarks we have in the tree) against
the pre-flattened version.

BUG=v8:5388
R=bmeurer@chromium.org, adamk@chromium.org, littledan@chromium.org

Review-Url: https://codereview.chromium.org/2382013002
Cr-Commit-Position: refs/heads/master@{#39907}

Port f84f45f9

Original commit message:
When zeroing a floating point stack slot, store the zero register directly,
rather than storing zero moved to an FP register.

BUG=

Review-Url: https://codereview.chromium.org/2364903002
Cr-Commit-Position: refs/heads/master@{#39906}

There are only a few occasions where we allocate a register in an outer
expression allocation scope, which makes the costly free-list approach
of the BytecodeRegisterAllocator unecessary. This CL replaces all
occurrences with moves to the accumulator and stores to a register
allocated in the correct scope. By doing this, we can simplify the
BytecodeRegisterAllocator to be a simple bump-pointer allocator
with registers released in the same order as allocated.

The following changes are also made:
 - Make BytecodeRegisterOptimizer able to use registers which have been
   unallocated, but not yet reused
 - Remove RegisterExpressionResultScope and rename
   AccumulatorExpressionResultScope to ValueExpressionResultScope
 - Introduce RegisterList to represent consecutive register
   allocations, and use this for operands to call bytecodes.

By avoiding the free-list handling, this gives another couple of
percent on CodeLoad.

BUG=v8:4280

Review-Url: https://codereview.chromium.org/2369873002
Cr-Commit-Position: refs/heads/master@{#39905}

BUG=

Review-Url: https://codereview.chromium.org/2374013004
Cr-Commit-Position: refs/heads/master@{#39904}

BUG=v8:5449
R=machenbach@chromium.org
TBR=littledan@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2383003002
Cr-Commit-Position: refs/heads/master@{#39903}

Review-Url: https://codereview.chromium.org/2383473003
Cr-Commit-Position: refs/heads/master@{#39902}

This patch moves the method ParseFunctionDeclaration to ParserBase.
It also cleans up some forgotten method headers in parser and preparser.

R=adamk@chromium.org, verwaest@chromium.org
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2376293002
Cr-Commit-Position: refs/heads/master@{#39901}

Before evaluating a module, all variables declared at the top-level
in _any_ of the modules in the dependency graph must be initialized.
This is observable because a module A can access a variable imported
from module B (e.g. a function) at a point when module B's body hasn't
been evaluated yet.

We achieve this by implementing modules internally as generators with
two states (not initialized, initialized).

R=adamk@chromium.org
BUG=v8:1569
CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_win_dbg

Committed: https://crrev.com/f4dfb6fbe1cdd9a0f287a1a9c496e1f69f6f5d20
Committed: https://crrev.com/8c52a411583e870bd5ed100864caa58f491c5d88
Review-Url: https://codereview.chromium.org/2375793002
Cr-Original-Original-Commit-Position: refs/heads/master@{#39871}
Cr-Original-Commit-Position: refs/heads/master@{#39892}
Cr-Commit-Position: refs/heads/master@{#39900}

This ports RegExp.prototype.exec to a TurboFan builtin.

LastMatchInfo is now stored on the context in order to be able to access
it from the stub.

Unmodified RegExp instances go through a fast path of accessing the
lastIndex property as an in-object field, while modified instances call
into runtime for lastIndex loads and stores.

Octane/regexp shows slight improvements (between 0 and 5%) with this CL.

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2375953002
Cr-Commit-Position: refs/heads/master@{#39899}

TBR=jochen@chromium.org, neis@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2374253008
Cr-Commit-Position: refs/heads/master@{#39898}

- added most part of inspector tests that depends only on JavaScript domains.

BUG=chromium:635948
R=dgozman@chromium.org,alph@chromium.org

Review-Url: https://codereview.chromium.org/2369753004
Cr-Commit-Position: refs/heads/master@{#39897}

Revert of Reland: [modules] Properly initialize declared variables. (patchset #6 id:100001 of https://codereview.chromium.org/2375793002/ )

Reason for revert:
Speculative revert for christmas tree

Original issue's description:
> Reland: [modules] Properly initialize declared variables.
>
> Before evaluating a module, all variables declared at the top-level
> in _any_ of the modules in the dependency graph must be initialized.
> This is observable because a module A can access a variable imported
> from module B (e.g. a function) at a point when module B's body hasn't
> been evaluated yet.
>
> We achieve this by implementing modules internally as generators with
> two states (not initialized, initialized).
>
> R=adamk@chromium.org
> BUG=v8:1569
> CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_win_dbg
>
> Committed: https://crrev.com/f4dfb6fbe1cdd9a0f287a1a9c496e1f69f6f5d20
> Committed: https://crrev.com/8c52a411583e870bd5ed100864caa58f491c5d88
> Cr-Original-Commit-Position: refs/heads/master@{#39871}
> Cr-Commit-Position: refs/heads/master@{#39892}

TBR=adamk@chromium.org,mstarzinger@chromium.org,machenbach@chromium.org,neis@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:1569

Review-Url: https://codereview.chromium.org/2387593002
Cr-Commit-Position: refs/heads/master@{#39896}

- added inspector test suite definition in testcfg.py
- added JS infrastructure for tests in protocol-test.js

BUG=chromium:635948
R=dgozman@chromium.org,alph@chromium.org

Review-Url: https://codereview.chromium.org/2370743003
Cr-Commit-Position: refs/heads/master@{#39895}

First stab at strongly typing the wasm compiled module FixedArray. The goal
is to improve maintainability of the data structures living on the JS heap.

My goal is to do so just for the first level, since we plan to eventually
avoid copying the metadata bits that are currently copied from the decoded
structures (export/import metadata, etc).

Subsequent CLs will try and consolidate internal functions working off the
compiled module as members, and evaluate what the actual interface with the
rest of the world of this type should be - we may be able to completely
move it in the cc file, for instance.

BUG=

Committed: https://crrev.com/6e03b72d9d7c0d69a4222981687757ffb0737236
Review-Url: https://codereview.chromium.org/2340623003
Cr-Original-Commit-Position: refs/heads/master@{#39890}
Cr-Commit-Position: refs/heads/master@{#39894}

Revert of [wasm] Strongly typed compiled module (patchset #7 id:120001 of https://codereview.chromium.org/2340623003/ )

Reason for revert:
Forgot to correctly clone a heap number. Reverting to fix.

Original issue's description:
> [wasm] Strongly typed compiled module
>
> First stab at strongly typing the wasm compiled module FixedArray. The goal
> is to improve maintainability of the data structures living on the JS heap.
>
> My goal is to do so just for the first level, since we plan to eventually
> avoid copying the metadata bits that are currently copied from the decoded
> structures (export/import metadata, etc).
>
> Subsequent CLs will try and consolidate internal functions working off the
> compiled module as members, and evaluate what the actual interface with the
> rest of the world of this type should be - we may be able to completely
> move it in the cc file, for instance.
>
> BUG=
>
> Committed: https://crrev.com/6e03b72d9d7c0d69a4222981687757ffb0737236
> Cr-Commit-Position: refs/heads/master@{#39890}

TBR=bradnelson@chromium.org
# 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/2383623003
Cr-Commit-Position: refs/heads/master@{#39893}

Before evaluating a module, all variables declared at the top-level
in _any_ of the modules in the dependency graph must be initialized.
This is observable because a module A can access a variable imported
from module B (e.g. a function) at a point when module B's body hasn't
been evaluated yet.

We achieve this by implementing modules internally as generators with
two states (not initialized, initialized).

R=adamk@chromium.org
BUG=v8:1569
CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_win_dbg

Committed: https://crrev.com/f4dfb6fbe1cdd9a0f287a1a9c496e1f69f6f5d20
Review-Url: https://codereview.chromium.org/2375793002
Cr-Original-Commit-Position: refs/heads/master@{#39871}
Cr-Commit-Position: refs/heads/master@{#39892}

- added test runner, that takes file names and V8 flags as arguments and run scripts from passed files with passed flags in frontend context

BUG=chromium:635948
R=dgozman@chromium.org,alph@chromium.org

Review-Url: https://codereview.chromium.org/2372793002
Cr-Commit-Position: refs/heads/master@{#39891}

First stab at strongly typing the wasm compiled module FixedArray. The goal
is to improve maintainability of the data structures living on the JS heap.

My goal is to do so just for the first level, since we plan to eventually
avoid copying the metadata bits that are currently copied from the decoded
structures (export/import metadata, etc).

Subsequent CLs will try and consolidate internal functions working off the
compiled module as members, and evaluate what the actual interface with the
rest of the world of this type should be - we may be able to completely
move it in the cc file, for instance.

BUG=

Review-Url: https://codereview.chromium.org/2340623003
Cr-Commit-Position: refs/heads/master@{#39890}

Revert of [wasm] Remove improper assembler check for grow memory. (patchset #2 id:20001 of https://codereview.chromium.org/2376153003/ )

Reason for revert:
grow-memory test now fails on Linux dbg, blocking the CQ:

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20debug/builds/11217

Original issue's description:
> [wasm] Remove improper assembler check for grow memory.
>
> Note that the offset can still be out of bounds, even after grow memory. The calculation of the remaining size can overflow.
>
> R=gdeepti@chromium.org
> BUG=chromium:644670
>
> Committed: https://crrev.com/e6071a9c067e07304329250e040b652fb82e9b5e
> Cr-Commit-Position: refs/heads/master@{#39886}

TBR=gdeepti@chromium.org,titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:644670

Review-Url: https://codereview.chromium.org/2378973003
Cr-Commit-Position: refs/heads/master@{#39889}

- added the channel implementation,
- added inspector implementation,
- added v8::Extension for communication between backend and frontend.

BUG=chromium:635948
R=dgozman@chromium.org,alph@chromium.org

Review-Url: https://codereview.chromium.org/2368393003
Cr-Commit-Position: refs/heads/master@{#39888}

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

Review-Url: https://codereview.chromium.org/2384483002
Cr-Commit-Position: refs/heads/master@{#39887}

Note that the offset can still be out of bounds, even after grow memory. The calculation of the remaining size can overflow.

R=gdeepti@chromium.org
BUG=chromium:644670

Review-Url: https://codereview.chromium.org/2376153003
Cr-Commit-Position: refs/heads/master@{#39886}

R=bradnelson@chromium.org,mtrofin@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2384513002
Cr-Commit-Position: refs/heads/master@{#39885}

Revert of [WASM] Implements catch for the wasm low level exception mechanism. (patchset #16 id:300001 of https://codereview.chromium.org/2275293002/ )

Reason for revert:
nosse4 errors:
https://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/13524
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20debug/builds/11215

Original issue's description:
> [WASM] Implements catch for the wasm low level exception mechanism.
>
> BUG=
>
> Committed: https://crrev.com/93e5425c46453764779bd557628d61fae670027a
> Cr-Commit-Position: refs/heads/master@{#39881}

TBR=titzer@chromium.org,bradnelson@chromium.org,jpp@chromium.org
# 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/2383613002
Cr-Commit-Position: refs/heads/master@{#39884}

Uses the base hashmap to store the ConstantArrayBuilder's constant map,
which slightly improves the performance of ConstantArrayBuilder::Insert.

Includes a small overload of the hashmap LookupOrInsert method, which
allows passing in a value creation function instead of just default
initialising new values.

On Octane's codeload, this gives (on my machine) a 0.27% improvement,
which doesn't sound like a lot but I guess every little helps.

Review-Url: https://codereview.chromium.org/2336553002
Cr-Commit-Position: refs/heads/master@{#39883}

Adds a fast-path test and branch for the turbofan graph generated by
BytecodeGraphBuilder for dynamic global lookups.

BUG=v8:5263

Review-Url: https://codereview.chromium.org/2374983003
Cr-Commit-Position: refs/heads/master@{#39882}

BUG=

Review-Url: https://codereview.chromium.org/2275293002
Cr-Commit-Position: refs/heads/master@{#39881}

The label names were reversed - an external string is a short external
string if (instance_type | kShortExternalStringMask) != 0.

R=ishell@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2380073002
Cr-Commit-Position: refs/heads/master@{#39880}

Migrate newly added C++ String Iterator builtins to TFJ builtins, per
step 4. of the String Iterator Baseline Implementation section of the design doc

BUG=v8:5388
R=bmeurer@chromium.org, mstarzinger@chromium.org, jkummerow@chromium.org

Committed: https://crrev.com/f9a2c8b1112c4e915df8bc5f7ea1fccdf7a33ff8
Cr-Commit-Position: refs/heads/master@{#39765}

patch from issue 2358263002 at patchset 260001 (http://crrev.com/2358263002#ps260001)

Review-Url: https://codereview.chromium.org/2381053002
Cr-Commit-Position: refs/heads/master@{#39879}

Making new nodes inside of exception-handled blocks fiddles around with the
current environment to merge the exception paths. In particular, the current
environment pointer is mutated. This patch ensures that when we merge the fast
and slow paths of the LdaContextLookup, we actually merge the correct
environment and do not accidentally merge the exceptional environment.

BUG=chromium:651394

Review-Url: https://codereview.chromium.org/2379043002
Cr-Commit-Position: refs/heads/master@{#39878}

BUG=chromium:635948
R=dgozman@chromium.org,jochen@chromium.org

Review-Url: https://codereview.chromium.org/2373983003
Cr-Commit-Position: refs/heads/master@{#39877}

Port: 1beb89f2

This patch simplifies code for speeding up marking and
removes write barrier counter.

The step size is now computed based in two parts:
- bytes to mark in order to keep up with allocation,
- bytes to mark in order to make progress.

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

Review-Url: https://codereview.chromium.org/2378053003
Cr-Commit-Position: refs/heads/master@{#39876}

Review-Url: https://codereview.chromium.org/2377343002
Cr-Commit-Position: refs/heads/master@{#39875}

The test now checks the case when an observer is added after tracing is started.

BUG=chromium:406277

Review-Url: https://codereview.chromium.org/2376953002
Cr-Commit-Position: refs/heads/master@{#39874}