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Author SHA1 Message Date
kmillikin@chromium.org
cefa4cc148 Get rid of CodeStub::TryGetCode. 
This function is no longer needed.  It was only used (overly defensively)
when fetching the stack check stub for on-stack replacement patching.

R=vegorov@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/8510013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9942 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 15:44:13 +00:00
vegorov@chromium.org
3bb1da0ff0 Fix Win64 compilation problems introduced by r9932. 
R=yangguo@chromium.org

Review URL: http://codereview.chromium.org/8505019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9941 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 15:40:08 +00:00
jkummerow@chromium.org
1b7f24e9c8 MIPS: Initial gyp infrastructure for MIPS architecture. 
BUG=
TEST=

Review URL: http://codereview.chromium.org/8505007
Patch from Gergely Kis <gergely@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9940 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 15:31:54 +00:00
yangguo@chromium.org
8dcfcdd7da Fixing presubmit. 
Review URL: http://codereview.chromium.org/8510012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9939 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 15:06:10 +00:00
yangguo@chromium.org
8a782f26aa Removing outdated assertions. 
R=mstarzinger@chromium.org

Review URL: http://codereview.chromium.org/8497045

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9938 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 14:47:12 +00:00
yangguo@chromium.org
97798860a0 Repeat last debugger command in the arm simulator when command input is empty. 
Review URL: http://codereview.chromium.org/8506015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9937 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 14:37:04 +00:00
yangguo@chromium.org
6157562994 Simplify StringCharCodeAt in non-crankshaft codegen. 
TEST=test/mjsunit/string-slices.js

Review URL: http://codereview.chromium.org/8510005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9936 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 14:32:51 +00:00
yurys@chromium.org
8b7bcc4e80 Add getters for column number and script id to v8::Function 
Review URL: http://codereview.chromium.org/8508008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9935 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 14:18:30 +00:00
vegorov@chromium.org
aff88ef399 Fix presubmit error introduced by r9932. 
R=erik.corry@gmail.com
BUG=
TEST=

Review URL: http://codereview.chromium.org/8511010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9934 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 14:04:56 +00:00
kmillikin@chromium.org
7664133e87 A small collection of cleanup in the parser and AST. 
* Remove a couple of unused fields from the FunctionLiteral, ensure that all
  the bools are packed.
* Rename SaveScope and LexicalScope in the parser.
* Use an enum to generate the numbers 0..N and the dependent count, rather
  than static const ints.  This is simpler to extend (coming in a future
  change).

R=danno@chromium.org,keuchel@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/8505012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9933 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 13:54:26 +00:00
vegorov@chromium.org
9f50147031 Ensure that promotion queue does not overlap with objects relocated to ToSpace. 
R=erik.corry@gmail.com

Review URL: http://codereview.chromium.org/8477030

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9932 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 13:48:43 +00:00
mstarzinger@chromium.org
4391aff4a3 Temporarily skip one Mozilla regression test. 
R=erik.corry@gmail.com
BUG=v8:1817
TEST=mozilla/js1_5/Regress/regress-360969-05

Review URL: http://codereview.chromium.org/8508006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9931 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 13:11:11 +00:00
svenpanne@chromium.org
b16e02e823 Made PropertyType handling even more explicit. 
Replaced FIRST_PHANTOM_PROPERTY_TYPE by a predicate. Removed the (hopefully)
last default cases for switches on PropertyType. Benchmarks show that both
changes are performace-neutral.

Now every value of PropertyType should either be handled by an explicit case in
a switch or by an equality operator. Therefore, the C++ compiler should finally
be able to tell us which places to touch when changing PropertyType.

Review URL: http://codereview.chromium.org/8506004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9930 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 12:47:15 +00:00
yangguo@chromium.org
bf98b6f2ed MIPS: Make _CallFunction proxy-aware. 
Port r9916 (d2195670)

Original commit message:
Change calling convention for CallFunction stub. Some fixes regarding strict mode call traps.

BUG=
TEST=

Review URL: http://codereview.chromium.org/8509004
Patch from Gergely Kis <gergely@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9929 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 12:19:26 +00:00
mikhail.naganov@gmail.com
49df2a6ddc A page created a number of ConsStrings that refer to one big string. 
Each such string requires small amount of heap memory.
Heap snapshot generator copies all the strings into internal hash map for future use.
The each copy requires much more memory than original v8 string.

I made a workaround for this. The snapshot will copy only first 1024 symbols.
A simple drive-by fix was made for a performance problem in ToCString implementation.

BUG=v8:1816
TEST=none

Review URL: http://codereview.chromium.org/8509003
Patch from Ilya Tikhonovsky <loislo@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9928 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 12:15:35 +00:00
erik.corry@gmail.com
034eb17387 sync the OpenBSD code with Linux. Committing http://codereview.chromium.org/8499016/ for Robert Nagy 
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9927 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 12:01:45 +00:00
yangguo@chromium.org
09e97c41f2 MIPS: Enable the V8 profiler on MIPS. 
BUG=
TEST=

Review URL: http://codereview.chromium.org/8507008
Patch from Gergely Kis <gergely@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9926 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 11:57:05 +00:00
kmillikin@chromium.org
c97111c5c8 Update v8.gyp to reflect deleted file. 
TBR=svenpanne@chromium.org

Review URL: http://codereview.chromium.org/8509007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9925 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 11:35:06 +00:00
kmillikin@chromium.org
de0db0f598 Remove ast-inl.h. This file is not necessary. 
R=svenpanne@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/8509005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9924 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 11:32:54 +00:00
kmillikin@chromium.org
6cb5ae7ad9 MIPS: Tighten the code for MacroAssembler::ThrowUncatchable. 
Port r9909 (56c8728aa).

Original commit message:
Test at the bottom in the unwind loop.  Eliminate the possibility of a
useless move to the eax/rax/r0 register (currently impossible because
this function has two call sites).  Do not explicitly zero the context
because we've already saved 0 as the context in the handler.

BUG=
TEST=

Review URL: http://codereview.chromium.org/8507007
Patch from Gergely Kis <gergely@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9923 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 11:04:41 +00:00
mstarzinger@chromium.org
5e0ff8b2e0 Fix size of store buffer to depend on pointer size. 
This makes the store buffer size depend on the pointer size so that
store buffers can hold the same number of entries on all architectures.
The number of pages marked scan-on-scavenge should decrease on x64 and
performance of splay should drastically improve on x64.

R=erik.corry@gmail.com

Review URL: http://codereview.chromium.org/8498013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-09 09:51:54 +00:00
yangguo@chromium.org
53c6077cee Fixing issue 103259. 
BUG=103259
TEST=regress-103259.js

Review URL: http://codereview.chromium.org/8498011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9917 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 14:59:40 +00:00
rossberg@chromium.org
f936aac43e Make _CallFunction proxy-aware. 
Change calling convention for CallFunction stub.
Some fixes regarding strict mode call traps.

R=kmillikin@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/8318014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9916 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 14:39:37 +00:00
keuchel@chromium.org
72dba271eb Reapply r9870 "Remove some initialization checks based on source positions.". 
This reverts r9896 "Revert r9870 due to browser-test failures." See below for
the diff from the previous version for the ia32 platform. The code for other
platforms has been changed accordingly.

TEST=mjsunit/compiler/lazy-const-lookup.js

diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 2cbf518..1990f2f 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -1258,13 +1258,17 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy) {
         // binding is initialized:
         //   function() { f(); let x = 1; function f() { x = 2; } }
         //
-        // Check that we always have valid source position.
-        ASSERT(var->initializer_position() != RelocInfo::kNoPosition);
-        ASSERT(proxy->position() != RelocInfo::kNoPosition);
-        bool skip_init_check =
-            var->mode() != CONST &&
-            var->scope()->DeclarationScope() == scope()->DeclarationScope() &&
-            var->initializer_position() < proxy->position();
+        bool skip_init_check;
+        if (var->scope()->DeclarationScope() != scope()->DeclarationScope()) {
+          skip_init_check = false;
+        } else {
+          // Check that we always have valid source position.
+          ASSERT(var->initializer_position() != RelocInfo::kNoPosition);
+          ASSERT(proxy->position() != RelocInfo::kNoPosition);
+          skip_init_check = var->mode() != CONST &&
+              var->initializer_position() < proxy->position();
+        }
+
         if (!skip_init_check) {
           // Let and const need a read barrier.
           Label done;

Review URL: http://codereview.chromium.org/8479034

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9915 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 13:28:53 +00:00
danno@chromium.org
76a9340482 Fix removed return parameter count. 
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/8496011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9914 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 13:16:56 +00:00
danno@chromium.org
93559bb6c9 Attempt to fix Windows x64 build. 
R=jkummerow@chromium.org
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/8495012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9913 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 13:07:14 +00:00
ulan@chromium.org
0d536dec26 Shrink the new space and uncommit marking deque on low memory notification. 
BUG=v8:1669
TEST=cctest/test-heap/CollectingAllAvailableGarbageShrinksNewSpace

Review URL: http://codereview.chromium.org/8065003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9912 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 12:42:02 +00:00
mstarzinger@chromium.org
e24c612a5e Fix setting array length to be ES5 conform. 
This also refactors the way we set the length of an arrays' backing
store to use the new elements accessor interface. The actual fix is in
DictionaryElementsAccessor::SetLengthWithoutNormalize() where we first
search for non-deletable elements according to ES5 section 15.4.5.2
specifications.

Snippet from the specification: Attempting to set the length property of
an Array object to a value that is numerically less than or equal to the
largest numeric property name of an existing array indexed non-deletable
property of the array will result in the length being set to a numeric
value that is one greater than that largest numeric property name.

R=danno@chromium.org
TEST=test262/15.4.4.??-7-b-16

Review URL: http://codereview.chromium.org/8372064

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9911 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 11:59:56 +00:00
erik.corry@gmail.com
9b968b7db9 Another 64->32 bit warning from the Windows compiler. 
Review URL: http://codereview.chromium.org/8503010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9910 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 11:24:44 +00:00
kmillikin@chromium.org
aee8ae0548 Tighten the code for MacroAssembler::ThrowUncatchable. 
Test at the bottom in the unwind loop.  Eliminate the possibility of a
useless move to the eax/rax/r0 register (currently impossible because
this function has two call sites).  Do not explicitly zero the context
because we've already saved 0 as the context in the handler.

R=fschneider@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/8493008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9909 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 11:09:00 +00:00
erik.corry@gmail.com
59a472a742 Try to fix compile error on Windows. 
Review URL: http://codereview.chromium.org/8497010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9908 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 10:57:34 +00:00
svenpanne@chromium.org
fbc0a9cd6f Disentangle header dependecies a bit by moving PropertyDetails-related types into a separate header 
This moves PropertyType and its related predicate out of v8globals.h, where it didn't belong.

Review URL: http://codereview.chromium.org/8501006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9907 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 10:43:25 +00:00
erik.corry@gmail.com
cd8d915c72 Clean up the marking speed heuristics. This reduces the 
max heap size on 64 bit from ca. 300Mbytes to ca. 200Mbytes
on Ulan's splay variant.  On 32 bit not much change.
Review URL: http://codereview.chromium.org/8494012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9906 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 10:28:58 +00:00
fschneider@chromium.org
2a1f08a1c2 Improve dominator computation to avoid worst-case quadratic time. 
In case of a degenerated CFG like in the example below processing
predecessors in the wrong order yields n^2 runtime.

  do {
    if (x) break;
    if (x) break;
    if (x) break;
    if (x) break;
    if (x) break;
    if (x) break;
    if (x) break;
    if (x) break;
    if (x) break;
    if (x) break;
    if (x) break;
    // etc.
  } while (false);

Reversing iteration order avoids this.
Review URL: http://codereview.chromium.org/8502012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9905 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 10:18:25 +00:00
danno@chromium.org
3628c9347c Upstream Android V8 change. 
Review URL: http://codereview.chromium.org/8351073
Patch from Jing Zhao <jingzhao@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9904 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 10:14:03 +00:00
danno@chromium.org
3d8b0a606a Create stub and runtime function for x64 full-codegen array literal element initialization. 
R=svenpanne@chromium.org
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/8493024

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9903 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 10:10:24 +00:00
fschneider@chromium.org
4627023b38 Revert r9901 to make tree green again. 
There was a test failure on x64 mozilla tests.

TBR=ricow@chromium.org
Review URL: http://codereview.chromium.org/8495011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9902 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 09:56:09 +00:00
fschneider@chromium.org
cac3008437 [hydrogen] optimize switch with string clauses 
Hydrogen should optimize not only SMI clauses, but clauses with string literals
too.

Patch from fedor.indutny <fedor.indutny@gmail.com>.

R=vegorov@chromium.org
BUG=
TEST=
Review URL: http://codereview.chromium.org/8373029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9901 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 09:08:33 +00:00
svenpanne@chromium.org
36b715b1bd Refactoring only: Make the handling of PropertyType more explicit. 
Do not rely on 'default' clauses or 'if's when analysing a PropertyType, because
this makes it hard to find the relevant places when a new type is added. Note
that the detection of "phantom property types" is left untouched, because this
might have a performance impact, especially for the GC (to be investigated).

This is a preliminary step for introducing a new kind of map transition.

Review URL: http://codereview.chromium.org/8491016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9900 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-08 08:42:13 +00:00
erik.corry@gmail.com
b9a2d181a1 Revert accidental commit that messed up the incremental speed heuristics. 
Review URL: http://codereview.chromium.org/8467014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9899 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 14:00:02 +00:00
keuchel@chromium.org
c0d0bf863a Revert r9870 due to browser-test failures. 
This reverts commit 4d5b5f12aac932ad892c7b6f152b6168708d4210.

Review URL: http://codereview.chromium.org/8493006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9896 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 12:33:58 +00:00
ricow@chromium.org
3a41613340 Optimize format message to not use DefineOwnProperty and freeze, do these inline 
Review URL: http://codereview.chromium.org/8494005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9893 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 10:50:39 +00:00
erik.corry@gmail.com
52b1457fac Don't set the limit that triggers the next GC higher than the max 
old space size.
Review URL: http://codereview.chromium.org/8491009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9892 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 10:35:24 +00:00
yangguo@chromium.org
cfc6f31e59 MIPS: Adding assertions to fast elements conversion. 
Port r9875 (97dc1e0e).

BUG=
TEST=

Review URL: http://codereview.chromium.org/8467008
Patch from Gergely Kis <gergely@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9891 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 10:31:54 +00:00
jkummerow@chromium.org
5bbd86bc22 Prepare push to trunk. Now working on version 3.7.5. 
R=yangguo@chromium.org

Review URL: http://codereview.chromium.org/8492005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9888 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 10:08:24 +00:00
keuchel@chromium.org
aad9e50fb4 MIPS: Remove some initialization checks based on source positions. 
Port r9870 (959ec43).

Original commit message:

This depends on
http://codereview.chromium.org/8352039 and
http://codereview.chromium.org/8423005 .

BUG=
TEST=

Review URL: http://codereview.chromium.org/8467007
Patch from Gergely Kis <gergely@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9887 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 09:42:54 +00:00
ricow@chromium.org
086ae44213 Optimize DefineOneShotAccessor in messages.js to not call DefineOwnProperty. 
Review URL: http://codereview.chromium.org/8490008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9886 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 09:30:28 +00:00
jkummerow@chromium.org
9fa02bc5dd MIPS: Cleanup: use JumpIf[Not]Smi() whenever we can 
Port r8322 (7b8b4a951f).

BUG=
TEST=

Review URL: http://codereview.chromium.org/8428004
Patch from Gergely Kis <gergely@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9885 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-07 08:41:47 +00:00
jkummerow@chromium.org
f33e9909a6 Override product_extension instead of product_version to set SONAME for Linux shared library 
BUG=v8:1786

Review URL: http://codereview.chromium.org/8462006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9884 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-04 14:47:13 +00:00
mstarzinger@chromium.org
bca8d42e3b Revert r9596 due to page-cycler regressions. 
R=vegorov@chromium.org

Review URL: http://codereview.chromium.org/8463006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9883 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-04 13:05:16 +00:00