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Author SHA1 Message Date
yangguo@chromium.org
85d7a36ee0 Abort optimization when debugger is turned on. 
BUG=v8:2751
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18198003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15378 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-28 11:34:51 +00:00
machenbach@chromium.org
f3b458b472 Delete test file with newline problems. 
The file contains the combinations CRLF LFCR CR and LF, and it looks like git automatically changed them to LF in the last dcommit.

See also http://www.dont-panic.cc/capi/2009/02/16/how-to-force-git-to-consider-a-file-as-binary/

The file is going to be added again in a different issue with an additional .gitattributes file to treat it as binary.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18080013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15377 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-28 11:25:26 +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
jkummerow@chromium.org
bf632a8364 Fast-forward version number on bleeding_edge to 3.20.0 
R=danno@chromium.org

Review URL: https://codereview.chromium.org/18194005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15375 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-28 10:55:25 +00:00
machenbach@chromium.org
de8102d0dc Skip webkit tests in debug that are very slow. 
Duration for each is between 14 s and 160 s.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18034017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15374 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-28 10:32:43 +00:00
bmeurer@chromium.org
f11af230e8 Refactor HInferRepresentation into an HPhase and use the phase zone. 
Rename HInferRepresentation to HInferRepresentationPhase,
following naming scheme suggested by danno@chromium.org in
https://codereview.chromium.org/17458002

The HInferRepresentationPhase now uses the phase zone for all its
allocations.

Depends on https://codereview.chromium.org/17587008

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18054002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15373 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-28 07:40:35 +00:00
bmeurer@chromium.org
a46528e820 Fix zone usage within LAllocator. 
Previously all allocations in the register allocator were done on the
chunk (and graph) zone, even those that did not need to survive past
the register allocation. Now only allocations that need to survive
use the chunk zone, all other allocations use a separate zone local
to the LAllocator.

Depends on https://codereview.chromium.org/18022002

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17553004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15372 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-28 07:36:43 +00:00
ulan@chromium.org
50b59eeb72 Fix Android V8 path for testing on devices. 
This allows to run tests in production Android builds.

R=yangguo@chromium.org

Review URL: https://chromiumcodereview.appspot.com/18087002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15371 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-28 07:31:23 +00:00
machenbach@chromium.org
69590a370f Migrated several tests from blink to V8 repository. 
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18068003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15370 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 20:02:04 +00:00
machenbach@chromium.org
a643f86719 Make webkit test output comparison compatible to stress testing. 
In stress testing, the output is repeated several times. In this case, it is now compared several times to the actual output.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18062002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15369 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 19:45:45 +00:00
palfia@homejinni.com
ee67afee93 MIPS: The check for internalized strings relied on the fact that we had less than 64 distinct InstanceTypes. 
Port r15358 (3af77be)

Original commit message:
The check for internalized strings relied on the fact that we had less
than 64 distinct InstanceTypes. We are hitting that boundary, so this
check needs to be more comprehensive. In fact, two bits need to be
tested: verify that kNotStringTag isn't set, and that kInternalizedTag
is set.

BUG=

Review URL: https://codereview.chromium.org/18083004
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15368 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 19:19:48 +00:00
danno@chromium.org
eb2fc68835 Remove superfluous HInnerAllocatedObject in BuildEmitDeepCopy 
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/17881004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15367 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 16:07:55 +00:00
danno@chromium.org
5b1ccfb952 Type handling for special cases and optimization 
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/18078002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15366 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 15:31:49 +00:00
ulan@chromium.org
475131b2b9 Revert r15361 "Improved function entry hook coverage" because of ARM build error. 
R=siggi@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/18062006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15365 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 15:31:06 +00:00
hpayer@chromium.org
a32277c4ba Turn off stress compaction for break point tests. 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/17880005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15364 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 15:19:04 +00:00
hpayer@chromium.org
2957b2fdf8 Fix check style breakage. 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/18056005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15363 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 15:17:55 +00:00
yangguo@chromium.org
3ff7ab9ead Fix constructor call of relocation lock. 
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/18020002

Patch from Haitao Feng <haitao.feng@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15362 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 14:44:36 +00:00
danno@chromium.org
8494f3bf25 Improved function entry hook coverage 
Adds more coverage for function entry hook, sufficient to capture profiles that are contiguous from C++, through JS and back out to C++.

R=danno@chromium.org

Review URL: https://codereview.chromium.org/16578008

Patch from Sigurður Ásgeirsson <siggi@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15361 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 14:39:37 +00:00
danno@chromium.org
f95ddc8891 Add templatized convienience functions for adding hydrogen instructions 
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/18050004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15360 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 14:36:14 +00:00
danno@chromium.org
3b60d6de8e Make sure HCallNewArray uses right ElementsKind 
Close a small gc window that exists between when a HNewArrayCall instruction is
created and the ElementsKind type feedback for the construction function is
accesses.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/18059005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15359 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 14:22:07 +00:00
mvstanton@chromium.org
6aed526733 The check for internalized strings relied on the fact that we had less 
than 64 distinct InstanceTypes. We are hitting that boundary, so this
check needs to be more comprehensive. In fact, two bits need to be
tested: verify that kNotStringTag isn't set, and that kInternalizedTag
is set.

BUG=
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/17895002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15358 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 13:39:44 +00:00
danno@chromium.org
c35dbc30cb Generalize utilities to allow code templatization 
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/17853004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15357 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 13:36:15 +00:00
bmeurer@chromium.org
2f81a79d5a Refactor Hydrogen environment liveness analysis into an HPhase. 
Rename EnvironmentSlotLivenessAnalyzer to HEnvironmentLivenessAnalysisPhase,
following naming scheme suggested by danno@chromium.org in
https://codereview.chromium.org/17458002

The environment slot liveness analysis now uses the phase zone for
all its allocations.

Depends on https://codereview.chromium.org/18034003

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17587008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15356 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 13:15:10 +00:00
bmeurer@chromium.org
32f5e099d4 Add templatized Run() method for Hydrogen phases. 
Depends upon https://codereview.chromium.org/17657004

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18034003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15355 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 13:13:18 +00:00
bmeurer@chromium.org
dce010395d Turn zone_excess_limit_ into a constant. 
The zone_excess_limit_ is not changed at runtime, and there seems to
be no obvious reason to do so in the future.

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18034006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15354 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 13:10:43 +00:00
bmeurer@chromium.org
98786ae073 Refactor Hydrogen GVN into an HPhase and use the phase zone. 
The HGlobalValueNumberer class is renamed to HGlobalValueNumberingPhase,
following the naming scheme suggested by danno@chromium.org in
https://codereview.chromium.org/17458002

The GVN phase now uses the phase zone for all its allocations.

Depends upon https://codereview.chromium.org/18022002

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17657004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15353 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 13:09:08 +00:00
bmeurer@chromium.org
073b1d1dfb Move phase_zone from CompilationInfo to CompilationPhase. 
Each CompilationPhase has its own zone, used for phase local
allocations. The zone of CompilationInfo should only be used
for non phase local allocations.

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18022002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15352 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 13:03:01 +00:00
bmeurer@chromium.org
63812f9dc3 Fix the compilation of gdbjit 
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/18023005

Patch from Haitao Feng <haitao.feng@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15351 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 11:38:37 +00:00
bmeurer@chromium.org
16e11141a8 Add myself to OWNERS. 
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15350 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 11:37:47 +00:00
yurys@chromium.org
52d848bce7 Extract StackFrameIteratorBase 
This change introduces StackFrameIteratorBase which owns singleton frame instances and encapsulates some basic iterator functionality. It has two actual implementations: StackFrameIterator and SafeStackFrameIterator.

All logic specific to frame iteration at a random point (basically checks that fp and sp extracted from stack frames are within current stack boundaries) used only by CPU profiler is now concentrated in SafeStackFrameIterator.

Generic stack iteration used in all other places is put into StackFrameIterator. Also this iterator unlike SafeStackFrameIterator iterates through stack handlers.

StackAddressValidator and ExitFrameValidator classes were removed in favor of inline checks and simple methods.

BUG=None
R=loislo@chromium.org, svenpanne@chromium.org

Review URL: https://codereview.chromium.org/17819003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15349 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 09:34:31 +00:00
yurys@chromium.org
4aeccdb23e Do not iterate stack handlers in SafeStackFrameIterator 
CPU profiler doesn't use stack handlers so there is no need to iterate through them while traversing stack. This change SafeStackFrameIterator always iterate only frames and removes checks corresponding to the handlers iteration.

The problem described in the bug occurred because of a false assumption in SafeStackFrameIterator that if Isolate::c_entry_fp is not NULL then the top frame on the stack is always a C++ frame. It is false because we may have entered JS code again, in which case JS_ENTRY code stub generated by JSEntryStub::GenerateBody() will save current c_entry_fp value but not reset it to NULL and after that it will create ENTRY stack frame and JS_ENTRY handler on the stack and put the latter into Isolate::handler(top). This means that if we start iterating from c_entry_fp frame and try to compare the frame's sp with Isolate::handler()->address() it will turn out that frame->sp() > handler->address() and the condition in SafeStackFrameIterator::CanIterateHandles is not held.

BUG=252097
R=loislo@chromium.org, svenpanne@chromium.org

Review URL: https://codereview.chromium.org/17589022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15348 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 09:28:11 +00:00
titzer@chromium.org
98f3dab73b Fix elements-kind test to disable optimization of important functions under test; add simpler versions of elements kind test. 
Review URL: https://codereview.chromium.org/17872002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15347 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 08:46:46 +00:00
dslomov@chromium.org
ef189ecd82 Do not allow invocation of ArrayBuffer and array buffer views' constructors as functions. 
ES6 bug 695 (https://bugs.ecmascript.org/show_bug.cgi?id=695).
This never worked in WebKit, so no compatibility issues.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/17904007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15346 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-27 07:42:08 +00:00
palfia@homejinni.com
90d0b6cd97 MIPS: Avoid Unnecessary Smi Checks. 
Port r15344 (9fd1942)

BUG=

Review URL: https://codereview.chromium.org/17887007
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15345 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 20:22:41 +00:00
olivf@chromium.org
21cd74eaa2 Avoid Unnecessary Smi Checks 
BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/16026023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15344 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 17:37:55 +00:00
mstarzinger@chromium.org
df181f2c11 Remove obsolete free-space checks from MarkCompactCollector. 
R=danno@chromium.org

Review URL: https://codereview.chromium.org/17840004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15343 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 16:37:15 +00:00
peter.rybin@gmail.com
f0c7bc37a9 Fix misleading names and comments in mute local variables debugger helper 
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/17644013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15342 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 16:18:00 +00:00
danno@chromium.org
00709075ea Add DependentCode to PropertyCells 
R=mstarzinger@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/17895004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15341 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 16:17:12 +00:00
loislo@chromium.org
3da5ba9ac3 CPUProfiler: Simplify CodeEntry constructor calls. 
In almost all the places where we create CodeEntry we use default values.
Lets move them into arguments default values.

BUG=none
TEST=no logic changes.
R=yangguo@chromium.org, yurys@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=15333

Review URL: https://codereview.chromium.org/17836002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15340 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 16:04:25 +00:00
machenbach@chromium.org
f3f14fc7ed Migrate blink tests that are not relevant to blink into a new V8 test suite called 'blink'. 
This initial CL contains the new test suite code and two tests for demonstration.

Other tests will follow in a separate CL.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/17260002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15339 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 14:23:30 +00:00
mstarzinger@chromium.org
bd0deb9443 Remove obsolete unchecked accessors in JSFunction. 
R=hpayer@chromium.org
BUG=v8:1490

Review URL: https://codereview.chromium.org/17833002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15338 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 14:04:25 +00:00
bmeurer@chromium.org
9e0f0a73dc Get rid of ZoneScope completely. 
There's no need to differentiate between an actual Zone and its
scope. Instead we bind the lifetime of the Zone memory to the
lifetime of the Zone itself, which is way easier to understand
than having to dig through the code looking for zone scopes.

Depends on https://codereview.chromium.org/17826004/

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17827005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15337 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 13:36:16 +00:00
bmeurer@chromium.org
8e9b934e7e Get rid of the ZoneScopeMode. 
No one is using the DONT_DELETE_ON_EXIT mode for ZoneScopes anymore, so
we can safely assume that all ZoneScopes are DELETE_ON_EXIT now.

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17826004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15336 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 12:54:12 +00:00
loislo@chromium.org
06200a3113 Revert "CPUProfiler: Simplify CodeEntry constructor calls." 
This reverts commit a6cc1e3b563c0d0689da35dbf8163545c8146ddd.

One test starts failing on Windows.

BUG=none
TBR= yurys@chromium.org

Review URL: https://codereview.chromium.org/17875002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15335 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 12:38:10 +00:00
jkummerow@chromium.org
3634b61d21 ia32: Restore missing temp register for LNumberTagU 
BUG=v8:2692
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/17865002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15334 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 12:03:22 +00:00
loislo@chromium.org
4292ac5932 CPUProfiler: Simplify CodeEntry constructor calls. 
In almost all the places where we create CodeEntry we use default values.
Lets move them into arguments default values.

BUG=none
TEST=no logic changes.
R=yangguo@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/17836002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15333 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 09:55:33 +00:00
rossberg@chromium.org
e60acec321 Introduce Unsigned32 and RegExp types 
Also, renamed Integer31 back to Smi, and Integer32 to Signed32.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17589013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15332 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 09:51:57 +00:00
titzer@chromium.org
bfa9fe95dc Change PC for OSR entries to point to something more sensible (i.e. the first UnknownOsrValue), removing the need to record spilled OSR values and the need for duplicate deopt entries. 
Review URL: https://codereview.chromium.org/16381006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15331 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 08:43:27 +00:00
bmeurer@chromium.org
49b9ef269b Remove useless ZoneScopes from Parser. 
R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17817003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15330 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 08:05:41 +00:00
svenpanne@chromium.org
a92d237948 Allow users of the V8 API to distinguish between unset and undefined HiddenValues 
BUG=v8:2746
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/17781002

Patch from Adam Klein <adamk@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15329 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-26 08:00:05 +00:00