Handles of this type are automatically reset by the garbage collector
when their objects are not longer reachable.

The motivation is to reduce pause time of external.weak_global_handles
phase of the garbage collector by not maintaing the list of pending
callbacks and not calling the callbacks.

Local testing on discourse page of the v8.inifinite_scroll benchmark
shows 7x improvement for this GC phase.

Before:
external.weak_global_handles
 len: 21
 min: 0.0
 max: 4.5
 avg: 0.757142857143

After:
external.weak_global_handles
 len: 21
 min: 0.0
 max: 0.5
 avg: 0.109523809524

A follow-up patch will enable the new phantom handles in Chromium.

BUG=chromium:608333
LOG=NO

Review-Url: https://codereview.chromium.org/1950963002
Cr-Commit-Position: refs/heads/master@{#36095}

X87: Revert of [turbofan] Take the immediate size in account when narrowing ia32/x64 word comparison operators. (patchset #2 id:20001 of https://codereview.chromium.org/1948453002/ ).

  port 3b7ff999 (r36066)

  original commit message:
  Reason for revert:
  Breaks WASM; please also add tests when relanding.

  Original issue's description:
  > [turbofan] Take the immediate size in account when narrowing ia32/x64 word comparison operators.
  >
  > Before this patch, we would emit a cmp or test with a memory operand only if both of the operands in the IR were loads. Now if either of them is a load and the other one is an immediate, we can use a
  >
  > Committed: https://crrev.com/a0543313dbd46b0c2e72c91ee3488a7dc6db73e4
  > Cr-Commit-Position: refs/heads/master@{#36009}

BUG=

Review-Url: https://codereview.chromium.org/1958863003
Cr-Commit-Position: refs/heads/master@{#36094}

Rolling v8/build to e3d87b142123f2da73c94c276ee915c099afe909

Rolling v8/tools/clang to 15dd77e3ea10e43596ec6ac07b73431135915b30

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

Review-Url: https://codereview.chromium.org/1961713002
Cr-Commit-Position: refs/heads/master@{#36093}

Rolling v8/build to b81f2a05b5aa7f5b6cf843380eb276897b1ef626

Rolling v8/tools/clang to afdc842603935f994788bf2388e1155528448b2a

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

Review-Url: https://codereview.chromium.org/1961653002
Cr-Commit-Position: refs/heads/master@{#36092}

Add comments explaining how to iterate over an OrderedHashTable.
Use the correct strategy for iteration in Set::AsArray().
Add a DCHECK bounds check in OrderedHashTable::KeyAt().

BUG=v8:4946
LOG=y

Review-Url: https://codereview.chromium.org/1952093002
Cr-Commit-Position: refs/heads/master@{#36091}

Port c2de9611

Fixes an infinite loop on MIPS64 big-endian.

BUG=

Review-Url: https://codereview.chromium.org/1959463003
Cr-Commit-Position: refs/heads/master@{#36090}

No bugs found, but the additional coverage of arrows as default param
initializers in a generator param list seems good to have.

R=littledan@chromium.org

Review-Url: https://codereview.chromium.org/1949293002
Cr-Commit-Position: refs/heads/master@{#36089}

Currently we have Time and TimeTicks sharing some methods. This patch
creates TimeBase, and makes Time and TimeTicks inherits from it, so that time
related classes won't have to implement common methods and it's easier to
introduce new time related classes.

BUG=v8:4990
LOG=n

Review-Url: https://codereview.chromium.org/1952843002
Cr-Commit-Position: refs/heads/master@{#36088}

This ports https://codereview.chromium.org/1323293005 to V8.
I'm not aware of any evidence that such crashes are currently
happening, but it's probably good to ship this workaround anyway.

BUG=chromium:517681
LOG=n

Review-Url: https://codereview.chromium.org/1959643002
Cr-Commit-Position: refs/heads/master@{#36087}

R=clemensh@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1956703002
Cr-Commit-Position: refs/heads/master@{#36086}

Review-Url: https://codereview.chromium.org/1952753003
Cr-Commit-Position: refs/heads/master@{#36085}

They're always in sloppy mode, so always do the conversion

BUG=chromium:609134
R=bmeurer@chromium.org,verwaest@chromium.org
LOG=n

Review-Url: https://codereview.chromium.org/1960663002
Cr-Commit-Position: refs/heads/master@{#36084}

Some tests which fail with '--ignition --turbo --turbo-from-bytecode' pass with
just '--ignition'. Unskip these tests. Also group other tests with related
bugs.

BUG=v8:4680
LOG=N

Review-Url: https://codereview.chromium.org/1944413002
Cr-Commit-Position: refs/heads/master@{#36083}

R=titzer@chromium.org, ahaas@chromium.org, michael_dawson@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/1948053002
Cr-Commit-Position: refs/heads/master@{#36082}

MIPS: Add new relocation type WASM_MEMORY_SIZE_REFERENCE, use relocatable pointers to update wasm memory size references in generated code.

Port 117a56b7

BUG=

Review-Url: https://codereview.chromium.org/1959653002
Cr-Commit-Position: refs/heads/master@{#36081}

callstats.html in combination with callstats.py can be used to get an in-depth
view on where we spend time in v8. Furthermore, with callstats.html we can
compare different versions of v8/chrome and see where and how performnce
evolved.

Drive-by-fix: add missing copyrights header to ic-explorer.html and format
ic-explorer.html

BUG=

Review-Url: https://codereview.chromium.org/1947413004
Cr-Commit-Position: refs/heads/master@{#36080}

This removes:
- PersistentBase::SetWeak that takes WeakCallbackData.
  The embedders should use the version that takes WeakCallbackInfo.
- PersistentBase::SetPhantom.
  The embedders should SetWeak that takes WeakCallbackInfo.

Functions in DefaultPersistentValueMapTraits are changed to accept
WeakCallbackInfo instead of WeakCallbackData.

BUG=chromium:609808
LOG=NO

Review-Url: https://codereview.chromium.org/1953263002
Cr-Commit-Position: refs/heads/master@{#36079}

We just deleted a persistent the line before, so make sure the context
is cleared up before disposing the isolate

R=ulan@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1953253003
Cr-Commit-Position: refs/heads/master@{#36078}

BUG=chromium:609808
LOG=NO

Review-Url: https://codereview.chromium.org/1954033002
Cr-Commit-Position: refs/heads/master@{#36077}

Hydrogen logs are ambiguous if multiple functions share the same name.
This change adds file names to this output. Functions are now named
<file_name>:<function_name> to reduce this ambiguity.

R=ofrobots@google.com
BUG=

Review-Url: https://codereview.chromium.org/1913973004
Cr-Commit-Position: refs/heads/master@{#36076}

Deoptimizer is now able to reconstruct topmost accessor and constructor frames.

BUG=chromium:608278, v8:4698
LOG=N
TBR=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1936043002
Cr-Commit-Position: refs/heads/master@{#36075}

BUG=chromium:609808
LOG=NO

Review-Url: https://codereview.chromium.org/1949393006
Cr-Commit-Position: refs/heads/master@{#36074}

- Cleanup CL to remove unused parameters in elements.cc. Additionally use fields
  from the KeyAccumulator wherever possible.
- Make method names in KeyAccumulator more consistent

BUG=

Review-Url: https://codereview.chromium.org/1944703002
Cr-Commit-Position: refs/heads/master@{#36073}

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

Review-Url: https://codereview.chromium.org/1955723003
Cr-Commit-Position: refs/heads/master@{#36072}

Because not initializing fields can be, you know, dangerous.

Review-Url: https://codereview.chromium.org/1952703002
Cr-Commit-Position: refs/heads/master@{#36071}

R=cbruni@chromium.org
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/1922873004
Cr-Commit-Position: refs/heads/master@{#36070}

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/1945363002
Cr-Commit-Position: refs/heads/master@{#36069}

This moves all the machinery for tracing inlined function that is
specific to Crankshaft into the appropriate component. Only the old
side-channel via a list of InlinedFunctionInfo structs remained within
the CompilationInfo for now. In the long run we will reconstruct that
information from the deoptimization data on the code objects.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1944323002
Cr-Commit-Position: refs/heads/master@{#36068}

This changes different locations to extract the reference to the wasm
object and the function index from the stack trace, and make it
available through all the APIs which process stack traces.
The javascript CallSite object now has the new methods isWasm(),
getWasmObject() and getWasmFunctionIndex(); the byte offset is
available via getPosition().

Function names of wasm frames should be fully functional with this
commit, position information works reliably for calls, but not for
traps like unreachable or out-of-bounds accesses.

R=titzer@chromium.org, yangguo@chromium.org

Review-Url: https://codereview.chromium.org/1909353002
Cr-Commit-Position: refs/heads/master@{#36067}

Revert of [turbofan] Take the immediate size in account when narrowing ia32/x64 word comparison operators. (patchset #2 id:20001 of https://codereview.chromium.org/1948453002/ )

Reason for revert:
Breaks WASM; please also add tests when relanding.

Original issue's description:
> [turbofan] Take the immediate size in account when narrowing ia32/x64 word comparison operators.
>
> Before this patch, we would emit a cmp or test with a memory operand only if both of the operands in the IR were loads. Now if either of them is a load and the other one is an immediate, we can use a memory operand if the load representation machine size is wide enough to represent the latter.
>
> Committed: https://crrev.com/a0543313dbd46b0c2e72c91ee3488a7dc6db73e4
> Cr-Commit-Position: refs/heads/master@{#36009}

TBR=bmeurer@chromium.org,jfb@chromium.org,epertoso@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review-Url: https://codereview.chromium.org/1959603002
Cr-Commit-Position: refs/heads/master@{#36066}

BUG=v8:4280
LOG=N
NOTRY=true
TBR=rmcilroy@chromium.org

Review-Url: https://codereview.chromium.org/1956663002
Cr-Commit-Position: refs/heads/master@{#36065}

BUG=v8:4995
LOG=n
NOTRY=true
TBR=thakis@chromium.org, titzer@chromium.org

Review-Url: https://codereview.chromium.org/1955013002
Cr-Commit-Position: refs/heads/master@{#36064}

This operator was initially designed to handle arbitrary effect merging
for effect relaxation, but we don't do that (at least currently). So no
need to keep the dead operator around.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/1954983002
Cr-Commit-Position: refs/heads/master@{#36063}

R=bmeurer@chromium.org, jarin@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1945303003
Cr-Commit-Position: refs/heads/master@{#36062}

  port d2efbf25 (r36000)

  original commit message:

BUG=

Review-Url: https://codereview.chromium.org/1947363002
Cr-Commit-Position: refs/heads/master@{#36061}

I want to stop using d8 from the chromium build, so we could potentially
use it for running tests.

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

Review-Url: https://codereview.chromium.org/1944353002
Cr-Commit-Position: refs/heads/master@{#36060}

Rolling v8/build to 119d5305247498fdd8a215b8e2b6c50223ac7d4b

Rolling v8/tools/clang to 0bb0462a91310d88ab9d124d8db54a70c9e1d1b0

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

Review-Url: https://codereview.chromium.org/1953813004
Cr-Commit-Position: refs/heads/master@{#36059}

X87: Add new relocation type WASM_MEMORY_SIZE_REFERENCE, use relocatable pointers to update wasm memory size references in generated code.

  port 117a56b7 (r36044)

  original commit message:
  - Add new RelocInfo mode WASM_MEMORY_SIZE_REFERENCE in the assembler and add relocation information to immediates in compare instructions.
  - Use relocatable constants for MemSize/BoundsCheck in the wasm compiler

BUG=

Review-Url: https://codereview.chromium.org/1947413003
Cr-Commit-Position: refs/heads/master@{#36058}

X87: [turbofan] Take the immediate size in account when narrowing ia32/x64 word comparison operators.

  port a0543313 (r36009)

  original commit message:
  Before this patch, we would emit a cmp or test with a memory operand only if both of the operands in the IR were loads.
  Now if either of them is a load and the other one is an immediate, we can use a memory operand if the load representation machine size is wide enough to represent the latter.

BUG=

Review-Url: https://codereview.chromium.org/1954963002
Cr-Commit-Position: refs/heads/master@{#36057}

S390: Add new relocation type WASM_MEMORY_SIZE_REFERENCE, use relocatable pointers to update wasm memory size references in generated code.

port 117a56b7

Original commit message:
     - Add new RelocInfo mode WASM_MEMORY_SIZE_REFERENCE in the assembler and add relocation information to immediates in compare instructions.
     - Use relocatable constants for MemSize/BoundsCheck in the wasm compiler

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

Review-Url: https://codereview.chromium.org/1955593003
Cr-Commit-Position: refs/heads/master@{#36056}