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Author SHA1 Message Date
alexandre.rames@arm.com
62116e2c12 A64: Let the MacroAssembler resolve branches to distant targets. 
Code generation would fail when assembling a branch to a label that is bound
outside the immediate range of the instruction. A64 is sensitive to this, as the
various branching instructions have different ranges, going down to +-32KB for
TBZ/TBNZ.  The MacroAssembler is augmented to handle branches to targets that
may exceed the immediate range of instructions.

When branching backward to a label exceeding the instruction range, the
MacroAssembler can simply tweak the generated code to use an unconditional
branch with a longer range. For example instead of
    B(cond, &label);
the MacroAssembler can generate:
    b(InvertCondition(cond), &done);
    b(&label);
    bind(&done);

Since the target is not known when the branch is emitted, forward branches uses
a different mechanism. The MacroAssembler keeps track of forward branches to
unbound labels. When the code generation approaches the end of the range of a
branch, a veneer is generated for the branch.

BUG=v8:3148
LOG=Y
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/169893002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19444 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-18 13:15:32 +00:00
verwaest@chromium.org
60c08a8bf2 Directly store the transition target on LookupResult in TransitionResult. 
BUG=chromium:343964
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/170343003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19440 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-18 12:19:32 +00:00
yangguo@chromium.org
be7b023a5c Harmony: implement Math.clz32 
R=dslomov@chromium.org, svenpanne@chromium.org
BUG=v8:2938
LOG=N

Review URL: https://codereview.chromium.org/169783002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19435 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-18 10:49:35 +00:00
svenpanne@chromium.org
dbce27047e Fixed and improved code for integral division. Fixed and extended tests. 
Arithmetic right shifting is *not* division in two's complement
representation, only in one's complement. So we convert to one's
complement, shift, and go back to two's complement. By permutating the
last steps, one can get efficient branch-free code. This insight comes
from the paleozoic era of computer science, see the paper from 1976:

   Guy Lewis Steele Jr.: "Arithmetic Shifting Considered Harmful"
   ftp://publications.ai.mit.edu/ai-publications/pdf/AIM-378.pdf

This results in better and more correct code than our previous
"neg/shift/neg" dance.

LOG=y
BUG=v8:3151
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/166793002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19434 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-18 10:45:27 +00:00
yangguo@chromium.org
9ffe004ae4 Harmony: implement Math.fround. 
R=jarin@chromium.org
BUG=v8:2938
LOG=N

Review URL: https://codereview.chromium.org/169513002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19433 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-18 10:43:06 +00:00
mvstanton@chromium.org
8bcdbc354f Revert "Add a premonomorphic state to the call target cache." 
This reverts commit r19402

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/169713002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19412 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-17 14:22:18 +00:00
mvstanton@chromium.org
be731e6c95 Add a premonomorphic state to the call target cache. 
From a CL by kasperl: https://codereview.chromium.org/162903004/

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/163413003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19402 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-17 11:59:45 +00:00
jarin@chromium.org
4c7ed144e1 Comparison in effect context lazy deopt fix. 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/163623002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19396 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-16 05:51:10 +00:00
ulan@chromium.org
6744ff61ae Fix dictionary element load to pass correct elements kind. 
Using FAST_SMI_ELEMENTS triggers optimization on 64-bit architectures that load
only the higher 32 bits of the element. If the element is a pointer to undefined
that has 0 in the higher half than it is erroneously treated as SMI 0.

BUG=v8:3158
LOG=N
TEST=mjsunit/sparse-array-reverse,mjsunit/regress/regress-3158.js
R=danno@chromium.org, ishell@chromium.org

Review URL: https://codereview.chromium.org/166653005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19387 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-14 15:52:24 +00:00
yangguo@chromium.org
68c7523e63 Fix assignment of function name constant. 
If it's shadowed by a variable of the same name and both are forcibly
context-allocated, the function is assigned to the wrong context slot.

R=rossberg@chromium.org
BUG=v8:3138
LOG=Y

Review URL: https://codereview.chromium.org/159903008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19379 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-14 12:40:47 +00:00
jarin@chromium.org
8acefb33fe Test and fix for polymorphic named call deoptimization. 
The fix removes wrong simulates from the number branch of polymorphic
call/field access handling.

The change also fixes the same thing for polymorphic named field
access even thourgh the field access is probably safe in practice
(because it cannot deoptimize). It is better to keep all our simulates
in sync with full codegen.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/166503002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19375 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-14 12:02:39 +00:00
yangguo@chromium.org
a676bc1bbf Fix typed array error message. 
R=dslomov@chromium.org
BUG=v8:3159
LOG=N

Review URL: https://codereview.chromium.org/163293002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19369 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-14 09:33:03 +00:00
verwaest@chromium.org
e0960e19aa Fix polymorphic inlining of accessors in a test-context. 
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/164003002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19363 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-13 16:55:38 +00:00
m.m.capewell@googlemail.com
028ff21445 A64: Fix some int32 accesses in lithium 
This fixes mjsunit/sin-cos. There are further int32 accesses being investigated.

BUG=
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/163553005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19358 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-13 15:49:01 +00:00
ishell@chromium.org
6bb57517c0 Restore of compare-objeq-elim test accidentally removed in r19229. 
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/162903005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19354 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-13 12:22:24 +00:00
rafaelw@chromium.org
6b5a4cdef2 V8 Microtask Queue & API 
This patch generalizes Object.observe callbacks and promise resolution into a FIFO queue called a "microtask queue".

It also exposes new V8 API which exposes the microtask queue to the embedder. In particular, it allows the embedder to

-schedule a microtask (EnqueueExternalMicrotask)
-run the microtask queue (RunMicrotasks)
-control whether the microtask queue is run automatically within V8 when the last script exits (SetAutorunMicrotasks).

R=dcarney@chromium.org, rossberg@chromium.org, dcarney, rossberg, svenpanne
BUG=

Review URL: https://codereview.chromium.org/154283002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19344 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 22:04:19 +00:00
verwaest@chromium.org
161b2f689a Reland: "Use stability to only conditionally flush information from the CheckMaps table." 
BUG=
R=ishell@chromium.org

Original CL: https://codereview.chromium.org/153823003

Review URL: https://codereview.chromium.org/153653007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19342 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 18:48:12 +00:00
verwaest@chromium.org
7b7e3658f7 Don't propagate information through phis in loop headers. 
To properly do this, we'd have to iterate over CompareMaps (and their bodies) handling phis, until we have learned enough to decide which paths can be taken. For now, just disable learning from phis in loop headers.

BUG=
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/147023005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19341 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 18:30:41 +00:00
rmcilroy@chromium.org
26e8009997 [a64]: Disable failing sparse-array-reverse on a64 debug builds. 
BUG=v8:3158
LOG=N
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/160633002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19340 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 18:22:28 +00:00
verwaest@chromium.org
75432b7696 Revert "Use stability to only conditionally flush information from the CheckMaps table." 
R=ishell@chromium.org

BUG=

Review URL: https://codereview.chromium.org/137863005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19331 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 15:38:42 +00:00
verwaest@chromium.org
2b7d33572a Use stability to only conditionally flush information from the CheckMaps table. 
BUG=
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/153823003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19330 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 15:07:41 +00:00
jarin@chromium.org
af29e31a11 Fix for (One|Two)ByteSeqStringSetChar evaluation order/deopt. 
This makes the evaluation order consistent between full codegen
and Hydrogen (so that deopt does not screw up stack).

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/159983008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19326 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 13:31:24 +00:00
jochen@chromium.org
b0fcc801e9 A64: Skip tests failing on gc stress bots 
BUG=none
TBR=ulan@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/160353002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19321 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 12:18:36 +00:00
jochen@chromium.org
96a1886637 A64: Skip more known failures 
TBR=ulan@chromium.org
BUG=none
LOG=n

Review URL: https://codereview.chromium.org/160073007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19318 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 11:57:50 +00:00
ulan@chromium.org
e95bc7eec8 Merge experimental/a64 to bleeding_edge. 
BUG=v8:3113
LOG=Y
R=jochen@chromium.org, rmcilroy@chromium.org, rodolph.perfetta@arm.com

Review URL: https://codereview.chromium.org/148293020

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19311 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-12 09:19:30 +00:00
jarin@chromium.org
21bf99e53e Fix environment of the optimized version of the _SetValueOf intrinsic. 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/158723006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19289 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-11 16:11:53 +00:00
ishell@chromium.org
994f0f6dda Fix for a smi stores optimization on x64 with a test case. 
BUG=338425
LOG=N
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/152923006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19288 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-11 16:02:18 +00:00
yangguo@chromium.org
0870702436 Harmony: fix spec violation in Math.cosh. 
R=jarin@chromium.org
BUG=v8:3141
LOG=N

Review URL: https://codereview.chromium.org/159353003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19272 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-11 11:48:32 +00:00
yangguo@chromium.org
f78bfaa857 Fix spec violations in JSON.stringify wrt replacer array. 
R=verwaest@chromium.org
BUG=v8:3135
LOG=Y

Review URL: https://codereview.chromium.org/146623009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19266 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-11 10:45:39 +00:00
mvstanton@chromium.org
95ad971d0f Fix gcstress test failure 
Map collection complicates a test that wants to assert on code opt/deopt
because of prototype-chain changes. It can happen that a gc occurs
in the stack guard at the start of optimized function foo that deopts
function foo because of a map being collected and deoptimizing it's
dependent code.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/159653002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19258 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-11 09:06:13 +00:00
ishell@chromium.org
f46da9d43b Reland of r19102: Check elimination improvement: propagation of state through phis is supported, CheckMap narrowing implemented with tests. 
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/146623006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19229 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-10 15:32:54 +00:00
yangguo@chromium.org
b618d2a42a Fix inconsistencies wrt whitespaces. 
This relands r19196 with fixes.

BUG=v8:3109
LOG=Y
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/141323007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19222 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-10 12:43:10 +00:00
mstarzinger@chromium.org
23bfeabcfd Remove duplicate third-party test cases. 
Some of the third-party test cases in the mjsunit test suite were
originally taken from WebKit and are now fully covered by the equally
named test suite.

Mapping of test cases:
 - array-isarray.js -> test/webkit/Array-isArray.js
 - array-splice-webkit.js -> test/webkit/array-splice.js

R=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/158803002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19220 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-10 11:29:59 +00:00
rossberg@chromium.org
e8175a3e9f Revert "Make Function.length and Function.name configurable properties." 
Plenty of test failures on test262, Mozilla, Webkit. Will have to investigate.

TBR=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/139983003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19203 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-07 15:29:18 +00:00
rossberg@chromium.org
7317b71f02 Make Function.length and Function.name configurable properties. 
ES6 makes the Function object properties "length" and "name"
configurable; switch the implementation over to follow that.

Doing so exposed a problem in the handling of non-writable, but
configurable properties backed by foreign callback accessors
internally. As an optimization, if such an accessor property is
re-defined with a new value, its setter was passed the new value
directly, keeping the property as an accessor property. However, this
is not correct should the property be non-writable, as its setter will
then simply ignore the updated value. Adjust the enabling logic for
this optimization accordingly, along with adding a test.

LOG=N
R=rossberg@chromium.org, rossberg
BUG=v8:3045

Review URL: https://codereview.chromium.org/116083006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19200 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-07 14:55:30 +00:00
yangguo@chromium.org
db1a685b8f Revert "Fix inconsistencies wrt whitespaces." 
This reverts r19196.

TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/147443008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19199 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-07 14:13:00 +00:00
yangguo@chromium.org
d0f57e1195 Fix inconsistencies wrt whitespaces. 
\u0085 (NEL) is now considered a whitespace in accordance to http://www.unicode.org/Public/6.3.0/ucd/PropList.txt

R=mstarzinger@chromium.org
BUG=v8:3109
LOG=Y

Review URL: https://codereview.chromium.org/146983007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19196 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-07 12:34:45 +00:00
rafaelw@chromium.org
41039c4f13 Revert "Implement Microtask Delivery Queue" 
TBR=adamk,rossberg
BUG=

Review URL: https://codereview.chromium.org/150103012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19176 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-07 01:08:50 +00:00
rossberg@chromium.org
01f5601129 ES6: Remove __proto__ setter poison pill 
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-set-object.prototype.__proto__

The __proto__ setter should be reusable on other objects.

BUG=v8:2804
LOG=y
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/103343005

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19165 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-06 16:09:45 +00:00
jarin@chromium.org
476881ce5b Test and fix for _CallFunction intrinsic deoptimization. 
I have also cleaned up HOptimizedGraphBuilder::GenerateCallFunction
to use IfBuilder.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/131343013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19151 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-06 12:42:26 +00:00
jarin@chromium.org
eb502fe599 Binary operation deoptimization fix. 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/132453009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19132 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-06 09:36:55 +00:00
verwaest@chromium.org
7dc05b57fd Move failing ASSERT on ARM to a more sane place. 
Objects can actually be stored into themselves. This fails when no write
barrier is needed (eg, the object was just allocated).

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/148733005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19095 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-05 10:12:14 +00:00
rafaelw@chromium.org
7de9fc0a12 Implement Microtask Delivery Queue 
R=rossberg@chromium.org, rossberg
BUG=

Review URL: https://codereview.chromium.org/131413008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19084 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-04 19:58:49 +00:00
dslomov@chromium.org
a03d31394c Check the offset argument of TypedArray.set for fitting into Smi. 
R=jkummerow@chromium.org
BUG=340125
LOG=Y

Review URL: https://codereview.chromium.org/145623009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19051 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-04 09:53:05 +00:00
yangguo@chromium.org
9e70f6a4e7 Fix short-circuiting logical and/or in HOptimizedGraphBuilder. 
R=jkummerow@chromium.org
BUG=336148
LOG=Y

Review URL: https://codereview.chromium.org/143263022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19031 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-03 14:29:34 +00:00
verwaest@chromium.org
db7124dc28 Return a valid map for PropertyAccessInfos with Boolean type. 
BUG=340064
LOG=N
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/152603002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19023 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-03 10:20:32 +00:00
machenbach@chromium.org
d34938fe34 Fix expectations for new regression test. 
TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/150853004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19013 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-02-01 09:56:20 +00:00
verwaest@chromium.org
ae7a209e71 Remove CallICs 
BUG=
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/148223002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19001 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-01-31 16:52:17 +00:00
machenbach@chromium.org
30fb7b83b3 [Sheriff] Mark new regression test flaky on linux 32. 
BUG=
TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/148483004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19000 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-01-31 16:47:52 +00:00
jarin@chromium.org
3c2363f4b4 Simpler repro for bug 2989. 
We do not correctly handle accesses to f.arguments after one
of the argument has changed (where f is crankshafted).

R=machenbach@chromium.org
BUG=v8:2989
LOG=n

Review URL: https://codereview.chromium.org/151403003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18999 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-01-31 16:12:58 +00:00