AuroraMiddleware/v8
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51 Commits

Author SHA1 Message Date
yangguo@chromium.org
e2563d7a8e Make number of available threads isolate-dependent and expose it to ResourceConstraints. 
R=svenpanne@chromium.org
BUG=v8:2991
LOG=Y

Review URL: https://codereview.chromium.org/68203029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17866 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-11-19 11:52:47 +00:00
yangguo@chromium.org
d538ff90b5 Disable concurrent osr when concurrent recompilation is disabled. 
Also introduce a flag for a quick check that concurrency is on.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/64543004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17570 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-11-07 16:25:20 +00:00
yangguo@chromium.org
e0508615a9 Fix leak in optimizing compiler thread. 
R=mvstanton@chromium.org
BUG=

Review URL: https://codereview.chromium.org/27473006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17247 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-10-16 16:27:17 +00:00
yangguo@chromium.org
b8dd056fa2 Improve queuing for concurrent OSR. 
Specifically, this includes:
- Encapsulating data structure for osr buffer into CyclicBuffer
- Use the new CyclicQueue instead of UnboundedQueue to queue new jobs.
  We can enqueue and dequeue a CyclicQueue on both ends in O(1).
  This allows us to add OSR jobs to the front for lower compile latency.
- Dispose osr buffer by one stale job per GC to avoid leak

R=titzer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/25505002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17244 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-10-16 14:47:20 +00:00
yangguo@chromium.org
71ba8c5fb4 Retire concurrent recompilation delay for non-stress testing. 
Instead, we block concurrent recompilation until unblocked. This makes
affected tests more predictable and run shorter.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/26758003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17199 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-10-14 14:15:22 +00:00
yangguo@chromium.org
f5e783de49 Remove unnecessary mutex. 
The heap leak has since been solved.

R=mstarzinger@chromium.org
BUG=291236

Review URL: https://codereview.chromium.org/25237003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17002 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-30 11:41:30 +00:00
yangguo@chromium.org
42d7071422 Disposing an OSR job should only restore the back edge state. 
R=titzer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24725002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16978 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-27 09:37:18 +00:00
yangguo@chromium.org
612dedc781 Add trace output when recompilation queues are flushed. 
R=mvstanton@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24466003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16945 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-25 15:13:10 +00:00
yangguo@chromium.org
ed9d981ed6 Rename "OptimizingCompiler" to the more suitable "RecompileJob". 
R=mvstanton@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24543002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16939 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-25 10:01:18 +00:00
yangguo@chromium.org
10b45a5bc4 Less aggressive polling when concurrently compiling for OSR. 
Changes include:
- completed concurrent OSR tasks trigger a stack check interrupt.
- polling for completion is now guarded by a stack check.
- circular buffer for completed OSR tasks instead of list.

R=titzer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24237009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16934 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-25 08:26:11 +00:00
yangguo@chromium.org
1d07d3152c Fix compile error. 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23651012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16741 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-16 16:09:07 +00:00
yangguo@chromium.org
ea5ab721e4 Add mutex when accessing concurrent recompilation output queue. 
Also small refactorings.

R=mstarzinger@chromium.org
BUG=291236

Review URL: https://codereview.chromium.org/23902033

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16740 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-16 15:34:46 +00:00
yangguo@chromium.org
151e514930 Simplify installing concurrently recompiled code. 
Instead of overwriting the code entry of the function, we trigger
an interrupt to install the code on the main thread.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23542029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16681 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-12 11:30:56 +00:00
yangguo@chromium.org
62ac593d5a Pass PC offset into runtime when compiling for OSR. 
R=titzer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23842004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16649 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-11 12:39:00 +00:00
yangguo@chromium.org
070e3b0af4 Introduce concurrent on-stack replacement. 
Currently disabled behind --concurrent-osr.

R=titzer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23710014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16527 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-04 12:55:59 +00:00
bmeurer@chromium.org
fead0d0600 Cleanup Semaphore class. 
Drop the previous Semaphore class from platform files.

Add new Semaphore class using the new TimeDelta class for
the WaitFor() operation. Consistently assert correct behaviour
for the different implementations.

Improve test coverage of the Semaphore class.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23748003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16473 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-09-02 12:26:06 +00:00
bmeurer@chromium.org
e76482f2da Cleanup Mutex and related classes. 
Drop the previous Mutex and ScopedLock classes from platform files.

Add new Mutex, RecursiveMutex and LockGuard classes, which are
designed after their C++11 counterparts, so that at some point
we can simply drop our custom code and switch to the C++11
classes. We distinguish regular and recursive mutexes, as the
latter don't work well with condition variables, which will be
introduced by a followup CL.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23625003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16416 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-29 09:58:30 +00:00
bmeurer@chromium.org
b320dfcf58 Reland^2 "Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class." 
These classes are meant to replace OS::Ticks() and OS::TimeCurrentMillis(),
which are broken in several ways. The ElapsedTimer class implements a
stopwatch using TimeTicks::HighResNow() for high resolution, monotonic
timing.

Also fix the CpuProfile::GetStartTime() and CpuProfile::GetEndTime()
methods to actually return the time relative to the unix epoch as stated
in the documentation (previously that was relative to some arbitrary
point in time, i.e. boot time).

The previous Windows issues have been resolved, and we now use GetTickCount64()
on Windows Vista and later, falling back to timeGetTime() with rollover
protection for earlier Windows versions.

BUG=v8:2853
R=machenbach@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/23490015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16413 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-29 09:15:13 +00:00
bmeurer@chromium.org
adab11d0f9 Revert "Cross-compiling from Linux to Android requires -lrt for the host toolset.", "Fix Visual Studio debug build after r16398." and "Reland "Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class."" 
This reverts commit r16398, r16399 and r16402 for breaking the Windows
WebKit tests. Will reland fix which doesn't use High Resolution Timer
for ElapsedTimer (we suspect QueryPerformanceCounter overhead is
responsible for test breakage).

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/23710002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16405 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-28 14:32:08 +00:00
bmeurer@chromium.org
e2b4525397 Reland "Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class." 
These classes are meant to replace OS::Ticks() and OS::TimeCurrentMillis(),
which are broken in several ways. The ElapsedTimer class implements a
stopwatch using TimeTicks::HighResNow() for high resolution, monotonic
timing.

Also fix the CpuProfile::GetStartTime() and CpuProfile::GetEndTime()
methods to actually return the time relative to the unix epoch as stated
in the documentation (previously that was relative to some arbitrary
point in time, i.e. boot time).

BUG=v8:2853
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/23469013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16398 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-28 13:03:06 +00:00
bmeurer@chromium.org
1d3f6815e3 Revert "Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class." 
This reverts commit r16390 for breaking the Windows build. Will
reland fixed version, which also uses the platform/ folder instead
of time/ folder as per offline discussion.

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/23690003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16391 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-28 11:38:20 +00:00
bmeurer@chromium.org
fa5216a145 Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class. 
These classes are meant to replace OS::Ticks() and OS::TimeCurrentMillis(),
which are broken in several ways. The ElapsedTimer class implements a
stopwatch using TimeTicks::HighResNow() for high resolution, monotonic
timing.

Also fix the CpuProfile::GetStartTime() and CpuProfile::GetEndTime()
methods to actually return the time relative to the unix epoch as stated
in the documentation (previously that was relative to some arbitrary
point in time, i.e. boot time).

BUG=v8:2853
R=machenbach@chromium.org, yurys@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16388

Review URL: https://codereview.chromium.org/23295034

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16390 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-28 11:06:11 +00:00
bmeurer@chromium.org
cfb126c52a Revert "Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class." 
This reverts commit r16388 for breaking build due to merge typo,
will reland with typo fixed.

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/23698002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16389 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-28 11:04:40 +00:00
bmeurer@chromium.org
8faf4d4291 Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class. 
These classes are meant to replace OS::Ticks() and OS::TimeCurrentMillis(),
which are broken in several ways. The ElapsedTimer class implements a
stopwatch using TimeTicks::HighResNow() for high resolution, monotonic
timing.

Also fix the CpuProfile::GetStartTime() and CpuProfile::GetEndTime()
methods to actually return the time relative to the unix epoch as stated
in the documentation (previously that was relative to some arbitrary
point in time, i.e. boot time).

BUG=v8:2853
R=machenbach@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/23295034

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16388 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-28 10:59:07 +00:00
yangguo@chromium.org
be48c5ae26 Rename "parallel recompilation" to "concurrent recompilation". 
Also introduced macros for flag aliases for temporary backwards compatibility.

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23014007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16280 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-22 16:14:37 +00:00
yangguo@chromium.org
ef8d394f12 Re-reland "Flush parallel recompilation queues on context dispose notification" 
BUG=
R=hpayer@chromium.org, mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/22379002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16095 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-08-07 09:33:09 +00:00
bmeurer@chromium.org
e9fcf8fc98 Revert the latest set of platform changes. 
Revert "Fix NaCl build."
Revert "Revert target arch detection."
Revert "Fix typo."
Revert "Simplify implementation of Mutex."
Revert "Fix for older clang releases that lack __has_extension."
Revert "Reland initial bits of "Implement correct OS and CC detection.""

TBR=danno@chromium.org,svenpanne@chromium.org

Review URL: https://codereview.chromium.org/21095008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15976 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-31 07:51:46 +00:00
bmeurer@chromium.org
64bfd42a4c Simplify implementation of Mutex. 
Also moves Mutex to its own file mutex.{cc,h}.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/21087012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15964 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-30 17:12:49 +00:00
mstarzinger@chromium.org
3202e1d795 Re-revert "Flush parallel recompilation queues on context dispose notification" (r15883). 
R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/21156009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15947 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-30 08:35:48 +00:00
yangguo@chromium.org
14e205e9cf Reland "Flush parallel recompilation queues on context dispose notification." 
BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/19500022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15883 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-25 15:01:23 +00:00
yangguo@chromium.org
6cbe01edae Revert "Flush parallel recompilation queues on context dispose notification." 
This reverts r15833.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/19647018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15841 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-24 07:45:54 +00:00
yangguo@chromium.org
f70cc6e114 Flush parallel recompilation queues on context dispose notification. 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/19956004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15833 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-23 15:15:00 +00:00
yangguo@chromium.org
92523a4553 Join threads after stopping. 
R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18287003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15439 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-02 09:04:45 +00:00
yangguo@chromium.org
4afe85e42f Also delete optimization jobs in the output queue when stopping thread. 
R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18364002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15428 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-01 15:12:59 +00:00
yangguo@chromium.org
41cac47d57 Avoid data race in debug mode on the parallel thread. 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18194004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15376 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-28 11:24:27 +00:00
yangguo@chromium.org
cbf6244029 Use mutex instead of busy wait when installing optimized function. 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17099012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15262 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-21 08:38:12 +00:00
yangguo@chromium.org
2e10e3e336 Clean up queued compilation tasks when quitting. 
R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17543002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15261 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-21 08:37:05 +00:00
yurys@chromium.org
3b53f7dc61 Fix data race in v8::internal::UnboundQueue 
This change modifies memory accesses to ensure proper load/store ordering.

BUG=249750
R=dvyukov@google.com, jkummerow@chromium.org

Review URL: https://codereview.chromium.org/17294004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15219 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-20 06:23:34 +00:00
yangguo@chromium.org
7f8a3d803c Make assertion scopes thread safe. 
R=svenpanne@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/15691017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14919 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-03 15:32:22 +00:00
yangguo@chromium.org
49ce7642be Do not dereference handles during relocation. 
R=hpayer@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/13982023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14445 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-04-26 07:35:07 +00:00
yangguo@chromium.org
44c059f1c1 Parallel recompilation: fix concurrency issues. 
BUG=

Review URL: https://chromiumcodereview.appspot.com/12831003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13949 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-03-14 16:35:32 +00:00
yangguo@chromium.org
a722726dc4 Parallel recompilation: fewer handle dereferences and tighter checks. 
BUG=

Review URL: https://chromiumcodereview.appspot.com/12832002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13935 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-03-13 16:13:05 +00:00
yangguo@chromium.org
479e39a058 Parallel recompilation: remove interrupt for code generation. 
R=jkummerow@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/12488006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13917 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-03-12 18:03:18 +00:00
yangguo@chromium.org
03375a68d7 Details wrt parallel recompilation. 
This includes:
- actually release handles kept by compilation info when compilation completes.
- do not use parallel recompilation on single core CPUs.
- artificially delay parallel recompilation for debugging.
- fix outdated assertions wrt optimization status.
- add "parallel" option to %OptimizeFunctionOnNextCall.

R=jkummerow@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/12442002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13827 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-03-05 16:22:08 +00:00
yangguo@chromium.org
5681ef6fee Actually increment queue length for parallel recompile queue. 
R=jkummerow@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/12039088

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13521 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-01-25 15:54:19 +00:00
yangguo@chromium.org
94476cb89a Also time other API functions calling into javascript. 
And prevent crash when starting chromium without --single-process.

BUG=

Review URL: https://chromiumcodereview.appspot.com/11411144

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13051 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-11-26 08:56:59 +00:00
yangguo@chromium.org
3c251ec924 Fix valgrind warnings. 
BUG=

Review URL: https://chromiumcodereview.appspot.com/11418138

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13050 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-11-26 08:47:48 +00:00
yangguo@chromium.org
72db2287c3 Add parallel recompilation time to histogram and plot execution pause times. 
BUG=

Review URL: https://chromiumcodereview.appspot.com/11412125

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13036 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-11-22 13:04:11 +00:00
yangguo@chromium.org
63f109aaa5 Introduce helper functions to test parallel recompilation. 
BUG=

Review URL: https://chromiumcodereview.appspot.com/11419012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12986 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-11-16 10:57:50 +00:00
sanjoy@chromium.org
1d7c4d9189 Track how much time the compiler thread spends doing useful work. 
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10804027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12152 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-20 08:56:20 +00:00