port 51e992f1 (r32410)

  original commit message:
  Restore frame pointer directly from stack rather than copying it and
  restoring. Also restore return address register directly on platforms that
  support it.

BUG=

Review URL: https://codereview.chromium.org/1483063004

Cr-Commit-Position: refs/heads/master@{#32440}

Node has an operator<<, however, constructing an ostream in a debugger
session is non-trivial, hence this method.

BUG=

Review URL: https://codereview.chromium.org/1488953003

Cr-Commit-Position: refs/heads/master@{#32439}

Port 9e644881

Original commit message:
    This way we avoid the %_IsSmi magic that is required in TurboFan to
    (efficiently) check abitrary context slots for smi 0. Checking against
    "the hole" is common in the AstGraphBuilder and "the hole" is also used
    to mark other context slots as not initialized.

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

Review URL: https://codereview.chromium.org/1491453002

Cr-Commit-Position: refs/heads/master@{#32438}

Rolling v8/build/gyp to f4d65e35719cfe02257ece126c109cfc053ca35c

Rolling v8/tools/clang to 3bd755f93254f9c21a323a5cfd28dacbe02e53e4

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

Review URL: https://codereview.chromium.org/1486733003

Cr-Commit-Position: refs/heads/master@{#32437}

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

Review URL: https://codereview.chromium.org/1487873002

Cr-Commit-Position: refs/heads/master@{#32436}

Port 47502a23

Original commit message:
    Previously all contexts had a link to the global object, but what is
    required in most cases (except for the global load, store and delete
    case) is the native context.

    This also removes the second dummy global object that was still linked
    to every native context. We will add a different mechanism to ensure
    that builtins do not pollute the actual global object during
    bootstrapping.

    Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.

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

Review URL: https://codereview.chromium.org/1491433002

Cr-Commit-Position: refs/heads/master@{#32435}

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

Review URL: https://codereview.chromium.org/1480243003

Cr-Commit-Position: refs/heads/master@{#32434}

Port 7ceaf727

R=verwaest@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:1543, v8:3330, v8:3931
LOG=n

Review URL: https://codereview.chromium.org/1480423002

Cr-Commit-Position: refs/heads/master@{#32433}

Port 81e131ce

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

Review URL: https://codereview.chromium.org/1482153005

Cr-Commit-Position: refs/heads/master@{#32432}

SIMD.js potentially adds to the standard library passed into
asm.js modules. Splitting off the point where the SIMD object
would be referenced to allow work on SIMD typing to occur orthogonally.

Adding VariableInfo to allow tracking of simd constructors / check functions. Using this for fround.

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

Looking at simd.js

Review URL: https://codereview.chromium.org/1473513004

Cr-Commit-Position: refs/heads/master@{#32431}

Port d3e5db04

Original commit message:
    Up until now we sometimes pass Smi 0 around as closure and expect the
    runtime to translate that appropriately. But we need to be careful in
    some places to not confuse the Smi 0 with a real closure. However, we
    could instead just pass the correct closure extracted from the native
    context.

    This addresses three long-standing TODOs in the JSTypedLowering pass.

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

Review URL: https://codereview.chromium.org/1490553002

Cr-Commit-Position: refs/heads/master@{#32430}

This fixes a corner-case in redeclaration handling, where the ES2015
early error case got mixed up with legacy const handling in the parser.

Redeclaration using ES2015 'let' and 'const' should be early errors,
but legacy 'const' redeclaration has historically been a runtime error,
and should stay that way until legacy 'const' is gone.

The fix here is uglier than it might be due to
https://code.google.com/p/v8/issues/detail?id=4577, which keeps us
from simplifying the mess of if/else-if in the current code.

BUG=v8:4576
LOG=n

Review URL: https://codereview.chromium.org/1485943002

Cr-Commit-Position: refs/heads/master@{#32429}

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

Review URL: https://codereview.chromium.org/1490513004

Cr-Commit-Position: refs/heads/master@{#32428}

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

Review URL: https://codereview.chromium.org/1480213003

Cr-Commit-Position: refs/heads/master@{#32427}

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

Review URL: https://codereview.chromium.org/1484143002

Cr-Commit-Position: refs/heads/master@{#32426}

Port 3d004eea

Original commit message:
    This passes the new.target value in a register instead of through a
    side-channel via the construct stub. The interpreter entry trampoline
    stores this value in a bytecode register so that it can be accessed
    directly by the interpreter. The size of the interpreter stack frame
    hence grows by one slot.

R=mstarzinger@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4544
LOG=n

Review URL: https://codereview.chromium.org/1487863002

Cr-Commit-Position: refs/heads/master@{#32425}

The Type::Print method requires an explict zone, even for basic types
on arm debug.

This change introduced debug mode printing when types don't match:
https://codereview.chromium.org/1471073003/

Adding the zone parameter to make the arm build go green.

BUG= https://code.google.com/p/v8/issues/detail?id=4203
TEST=local arm build
TBR=bbudge@chromium.org,titzer@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1490593002

Cr-Commit-Position: refs/heads/master@{#32424}

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

Review URL: https://codereview.chromium.org/1488563003

Cr-Commit-Position: refs/heads/master@{#32423}

Port 51e992f1

Original commit message:
    Restore frame pointer directly from stack rather than copying it and
    restoring. Also restore return address register directly on platforms that
    support it.

R=danno@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4076
LOG=n

Review URL: https://codereview.chromium.org/1490563002

Cr-Commit-Position: refs/heads/master@{#32422}

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

Review URL: https://codereview.chromium.org/1485653003

Cr-Commit-Position: refs/heads/master@{#32421}

Port 51669873

Original commit message:
    Some highlights of this CL:
    * Refactor the mutable state out of Frame into FrameAccessState,
      which is maintained and updated during code generation to
      record whether sp- or fp-based frame access is currently active
      and how deep the stack on top of the frame is.
    * The operand resultion in linkage.cc now uses FrameAccessState
      to determine how to generate frame-accessing operands.
    * Update all platforms to accurately track additionally pushed
      stack slots (e.g. arguments for calls) in the FrameAccessState.
    * Add a flag, --turbo_sp_frame_access, which forces all frame
      access to be sp-based whenever possible. This will likely never
      be used in production, but for testing it's useful in verifying
      that the stack-tracking of each platform maintained in the
      FrameAccessState is correct.
    * Use sp-based frame access for gap resolving before tail
      calls. This will allow for slightly more efficient restoration
      of the frame pointer in the tail call in a later CL.
    * Remove most ad hoc groping into CallDescriptors to
      determine if a frame is needed, instead consistently use
      predicates like needs_frame(), IsCFunctionCall() and
      IsJSFunctionCall().

R=danno@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4076
LOG=n

Review URL: https://codereview.chromium.org/1484913003

Cr-Commit-Position: refs/heads/master@{#32420}

Shifts of integer values are in some contexts collapsed by the parser into single literal AST nodes, rather than a direct representation of the parse tree. Confirming this behavior in tests.

Integer TypedArrays are assumed to load and store "intish" values rather than more fine-grained type information. Reducing the precision of the typing information to match the spec and simplify the wasm generator.

The asm spec requires load and store values of various "float?", "floatish", "double?" and "intish" types to ensure undefined values are not visible and that float32 rounding occurs at the right time. More closely matching this.

Adding additional testing around unsigned / signed comparisons, loads and stores.

Adding addition debug mode printing when asserting about types fail.

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

Review URL: https://codereview.chromium.org/1471073003

Cr-Commit-Position: refs/heads/master@{#32419}

BUG=

Review URL: https://codereview.chromium.org/1453373002

Cr-Commit-Position: refs/heads/master@{#32418}

BUG=

Review URL: https://codereview.chromium.org/1481493002

Cr-Commit-Position: refs/heads/master@{#32417}

Revert of [heap] Aggressive code flushing in GC stress mode. (patchset #1 id:1 of https://codereview.chromium.org/1483993002/ )

Reason for revert:
This breaks (surprise) GC stress with custom snapshot, cannot reproduce, will need to investigate further.

https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/builds/2909/steps/Mjsunit/logs/deopt-inlined-from-call

Original issue's description:
> [heap] Aggressive code flushing in GC stress mode.
>
> This disregards the code age heuristic when deciding whether to flush
> code so that GC stress mode is more likely to flush out potential races
> between our various "invariants".
>
> R=hpayer@chromium.org
>
> Committed: https://crrev.com/28a3f23e50f1847dd1152e6bb4aa0579acbdaaab
> Cr-Commit-Position: refs/heads/master@{#32414}

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

Review URL: https://codereview.chromium.org/1485823002

Cr-Commit-Position: refs/heads/master@{#32416}

BUG=v8:4076
LOG=n

Review URL: https://codereview.chromium.org/1483053002

Cr-Commit-Position: refs/heads/master@{#32415}

This disregards the code age heuristic when deciding whether to flush
code so that GC stress mode is more likely to flush out potential races
between our various "invariants".

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1483993002

Cr-Commit-Position: refs/heads/master@{#32414}

In Python, `strip` can be used directly instead of stripping the ends
one by one.

R=machenbach@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1443963004

Cr-Commit-Position: refs/heads/master@{#32413}

This removes an overly complex predicate from the IsFlushable check
within the marking visitor. By now all JSFunction objects reference a
valid Context object, also builtin functions can be recognized without
looking at the JSFunction object.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1482363002

Cr-Commit-Position: refs/heads/master@{#32412}

BUG=
LOG=N

Review URL: https://codereview.chromium.org/1486613002

Cr-Commit-Position: refs/heads/master@{#32411}

Restore frame pointer directly from stack rather than copying it and
restoring. Also restore return address register directly on platforms that
support it.

BUG=v8:4076
LOG=n

Review URL: https://codereview.chromium.org/1488553002

Cr-Commit-Position: refs/heads/master@{#32410}

R=machenbach@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1480323002

Cr-Commit-Position: refs/heads/master@{#32409}

an optomization to remove redundant cast operations.

1. Adds an optimization to remove redundant ToBoolean and ToName operations.
2. Adds implementation and tests for cast operatorts to bytecode graph builder.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1468003002

Cr-Commit-Position: refs/heads/master@{#32408}

This way we avoid the %_IsSmi magic that is required in TurboFan to
(efficiently) check abitrary context slots for smi 0. Checking against
"the hole" is common in the AstGraphBuilder and "the hole" is also used
to mark other context slots as not initialized.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1484723003

Cr-Commit-Position: refs/heads/master@{#32407}

Revert of Do not remove write barriers for stores of old space references in most recent old space allocation. (patchset #1 id:1 of https://codereview.chromium.org/1478113002/ )

Reason for revert:
Broken canary. Trying to find out root cause.

Original issue's description:
> Do not remove write barriers for stores of old space references in most recent old space allocation.
>
> BUG=chromium:561449
> LOG=n
>
> Committed: https://crrev.com/369778ec55a63ebe51e8fa8497edb5b681069b9b
> Cr-Commit-Position: refs/heads/master@{#32368}

TBR=ulan@chromium.org,bmeurer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:561449

Review URL: https://codereview.chromium.org/1482973003

Cr-Commit-Position: refs/heads/master@{#32406}

Revert of Tenure transition array. (patchset #1 id:1 of https://codereview.chromium.org/1472363007/ )

Reason for revert:
Broken canary. Trying to find out root cause.

Original issue's description:
> Tenure transition array.
>
> BUG=
>
> Committed: https://crrev.com/c88d7cd1e09d921e8a9a2930cfe6f2dfbea3dc90
> Cr-Commit-Position: refs/heads/master@{#32378}

TBR=ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:563378

Review URL: https://codereview.chromium.org/1485613003

Cr-Commit-Position: refs/heads/master@{#32405}

Revert of Introduce instance type for transition arrays. (patchset #6 id:100001 of https://codereview.chromium.org/1480873003/ )

Reason for revert:
Broken canary. Trying to find out root cause.

Original issue's description:
> Introduce instance type for transition arrays.
>
> The motivation is to allow specialized marking visitor for transition arrays and collect all transition array in a list for post-processing in ClearNonLiveReferences.
>
> BUG=chromium:554488
> LOG=NO
>
> Committed: https://crrev.com/026095a3c7932573e1810b8064ec3008ed696601
> Cr-Commit-Position: refs/heads/master@{#32396}

TBR=mlippautz@chromium.org,jkummerow@chromium.org,ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:554488

Review URL: https://codereview.chromium.org/1483003002

Cr-Commit-Position: refs/heads/master@{#32404}

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1483933002

Cr-Commit-Position: refs/heads/master@{#32403}

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1488493002

Cr-Commit-Position: refs/heads/master@{#32402}

This depends on issue 1476403004.

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1479293002

Cr-Commit-Position: refs/heads/master@{#32401}