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Author SHA1 Message Date
erik.corry@gmail.com
a36695e853 Microoptimization to regexps. 
Review URL: https://chromiumcodereview.appspot.com/10917260

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12511 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-09-14 12:01:12 +00:00
yangguo@chromium.org
7cbca775ee Reland regexp global optimizations. 
BUG=

Review URL: https://chromiumcodereview.appspot.com/10872010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12396 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-08-28 09:37:41 +00:00
yangguo@chromium.org
01d8e3d4f5 Revert r12258, r12300 and r12302 (global regexp). 
R=ulan@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/10825472

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12350 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-08-21 09:46:23 +00:00
rossberg@chromium.org
984d0b0925 Rename Context::global to Context::global_object, 
in preparation for global lexical scope.

R=mstarzinger@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10832365

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12335 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-08-17 12:59:00 +00:00
rossberg@chromium.org
42552808ab Rename "global context" to "native context", 
in anticipation of the upcoming lexical global scope.

Mostly automatised as:

for FILE in `egrep -ril "global[ _]?context" src test/cctest`
do
  echo $FILE
  sed "s/Global context/Native context/g" <$FILE >$FILE.0
  sed "s/global context/native context/g" <$FILE.0 >$FILE.1
  sed "s/global_context/native_context/g" <$FILE.1 >$FILE.2
  sed "s/GLOBAL_CONTEXT/NATIVE_CONTEXT/g" <$FILE.2 >$FILE.3
  sed "s/GlobalContext/NativeContext/g" <$FILE.3 >$FILE
  rm $FILE.[0-9]
done

R=mstarzinger@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10832342

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12325 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-08-17 09:03:08 +00:00
yangguo@chromium.org
e0954ca592 Take advantage of batched results when matching global regexp. 
BUG=
TEST=regexp-global.js

Review URL: https://chromiumcodereview.appspot.com/10831126

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12258 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-08-06 09:06:27 +00:00
yangguo@chromium.org
bfd51f29dc R=yangguo@chromium.org,svenpanne@chromium.org 
x64 BinaryOpStub::GenerateSmiCode use wrong registers in one code path.

e.g. d8 --trace_ic
var dd = new Float64Array(2);
dd[1] = 1;
(function fn() {
  for (var i = 0; i < 1000; i++)
  dd[0] = 2 / dd[1];
})();
It keeps falling into runtime call and patching.

No regression test, because I don't how to test it.

Review URL: https://chromiumcodereview.appspot.com/10834064
Patch from Zheng Liu <shdwthr@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12226 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-30 13:04:10 +00:00
danno@chromium.org
43d0ed048d Implements a new API to set a function entry hook for profiling. 
Exposes a new API; V8::SetFunctionEntryHook.
If a non-NULL function entry hook is set, the code generator(s) will invoke on the entry hook at the very start of each generated function.

Committed: https://code.google.com/p/v8/source/detail?r=12069

Committed: https://code.google.com/p/v8/source/detail?r=12083

Review URL: https://chromiumcodereview.appspot.com/10706002
Patch from Sigurður Ásgeirsson <siggi@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12107 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-17 15:18:15 +00:00
danno@chromium.org
b1530257ab Revert 12083: Implements a new API to set a function entry hook for profiling. 
TBR=mstarzinger@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10695206

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12084 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-13 16:33:27 +00:00
danno@chromium.org
5c8c4bec46 Implements a new API to set a function entry hook for profiling. 
Exposes a new API; V8::SetFunctionEntryHook.
If a non-NULL function entry hook is set, the code generator(s) will invoke on the entry hook at the very start of each generated function.

Committed: https://code.google.com/p/v8/source/detail?r=12069

Review URL: https://chromiumcodereview.appspot.com/10706002
Patch from Sigurður Ásgeirsson <siggi@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12083 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-13 16:18:37 +00:00
danno@chromium.org
30569cba9b Revert 12069: Implements a new API to set a function entry hook for profiling 
Reverted due to waterfall failures

TBR=mstarzinger@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10704189

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12070 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-12 15:59:50 +00:00
danno@chromium.org
d6edbdd436 Implements a new API to set a function entry hook for profiling. 
Exposes a new API; V8::SetFunctionEntryHook.
If a non-NULL function entry hook is set, the code generator(s) will invoke on the entry hook at the very start of each generated function.

Review URL: https://chromiumcodereview.appspot.com/10706002
Patch from Sigurður Ásgeirsson <siggi@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12069 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-12 15:42:39 +00:00
fschneider@chromium.org
bb0a2ea766 Share optimized code for closures. 
Each SharedFunctionInfo gets an optimized code map to store
one optimized code object per context. When allocating a new
closure we consult this map and check if there is optimized code
that can be shared.

This patch is based on an original patch
by Anton Muhin (http://codereview.chromium.org/6793013/).

BUG=v8:2087, v8:2094
TEST=test/mjsunit/compiler/optimized-closures.js
Review URL: https://chromiumcodereview.appspot.com/10103035

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11817 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-06-14 14:06:22 +00:00
danno@chromium.org
9910edbb9a Implement tracking and optimizations of packed arrays 
R=jkummerow@chromium.org
TEST=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10170030

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11636 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-05-23 14:24:29 +00:00
yangguo@chromium.org
578fc3cc2d Implement loop for global regexps in regexp assembler. 
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10386090

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11623 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-05-22 14:05:44 +00:00
mstarzinger@chromium.org
60863e5cd6 Port function call type-feedback cells to x64 and ARM. 
R=fschneider@chromium.org
BUG=v8:1857,v8:2079

Review URL: https://chromiumcodereview.appspot.com/10124008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11391 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-19 14:17:12 +00:00
yangguo@chromium.org
47c4a5b4ef Make SubStringStub more robust wrt unsafe arguments. 
BUG=
TEST=test-strings/RobustSubStringStub

Review URL: https://chromiumcodereview.appspot.com/9969196

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11349 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-17 10:49:15 +00:00
fschneider@chromium.org
1f7d42efc9 Landing for pliard@chromium.org: Remove static initializers in v8. 
This change includes two CLs by pliard@chromium.org:

1. http://codereview.chromium.org/9447052/ (Add CallOnce() and simple LazyInstance implementation):

Note that this implementation of LazyInstance does not handle global destructors (i.e. the lazy instances are never deleted).

This CL was initially reviewed on codereview.appspot.com:
http://codereview.appspot.com/5687064/



2.  http://codereview.chromium.org/9455088/ (Remove static initializers in v8):
This CL depends on CL 9447052 (adding CallOnce and LazyInstance).
It is based on a patch sent by Digit.

With this patch applied, we have only one static initializer left (in atomicops_internals_x86_gcc.cc). This static initializer populates a structure used by x86 atomic operations. It seems that we can hardly remove it. If possible, it will be removed in a next CL. 

This CL also modifies the presubmit script to check the number of static initializers.


BUG=v8:1859
Review URL: https://chromiumcodereview.appspot.com/9666052

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11010 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-12 13:56:56 +00:00
yangguo@chromium.org
e711ff38ef Inline inequality compares of strings into CompareICStub instead of jumping into the CompareStub that handles the generic case. 
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9649027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10988 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-09 13:12:59 +00:00
yangguo@chromium.org
3ae794c498 Tweaks to SubStringStub 
Review URL: https://chromiumcodereview.appspot.com/9625003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10957 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-07 14:19:28 +00:00
yangguo@chromium.org
5ce562cda8 Reland r10908 (Ensure consistent result of transcendental function0.) 
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9583037

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10915 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-05 08:17:16 +00:00
yangguo@chromium.org
f2699b66cf Revert r10908 due to flakiness and crashes. 
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9580007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10909 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-02 15:00:52 +00:00
yangguo@chromium.org
12f2099993 Ensure consistent result of transcendental functions. 
BUG=
TEST=regress-transcendental.js

Review URL: https://chromiumcodereview.appspot.com/9572009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10908 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-02 14:33:15 +00:00
danno@chromium.org
57a0c6c6e3 Inline ordered relational compares of mixed double/undefined values. 
Allow Crankshaft to inline ordered relational comparisons (<, >, <=, >=) that have undefined arguments in addition to double value arguments (rather than calling the generic Compare stub).

R=fschneider@chromium.org
TEST=test/mjsunit/comparison-ops-and-undefined.js

Review URL: https://chromiumcodereview.appspot.com/9584006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10905 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-02 13:40:14 +00:00
erik.corry@gmail.com
a81b05af93 Fix the negative lookup stub to handle deleted entries in a 
dictionary.  This fixes http://code.google.com/p/v8/issues/detail?id=1964
"Closure-uri benchmark is sensitive to hash seed".
Review URL: https://chromiumcodereview.appspot.com/9463012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10848 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-28 08:32:44 +00:00
jkummerow@chromium.org
4233bf8348 Initial support for count-based profiling 
(behind FLAG_count_based_interrupts; only on ia32)

Review URL: https://chromiumcodereview.appspot.com/9373028

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10699 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-14 14:00:31 +00:00
danno@chromium.org
f0c4b87f34 Implement KeyedStoreICs to grow arrays on out-of-bound stores. 
Supports growing non-COW JSArray by a single element if the backing store has room, and initial allocation of a backing store for the store to index zero of an empty array  to kPreallocatedArrayElements elements (e.g. the [] array literal).

Review URL: https://chromiumcodereview.appspot.com/9310117

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10673 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-10 12:36:05 +00:00
kmillikin@chromium.org
581b7e6eb2 Streamline throwing in the C entry stub. 
Remove a gratuitous level of indirection in favor of direct calls to the
macro assembler, and eliminate some duplicated code for the uncatchable
case.

R=fschneider@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9373022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10671 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-10 08:47:35 +00:00
kmillikin@chromium.org
831ada2f0d Simplify handler pushing. 
Instead of using two separate bits to encode three possible values, use
three values to encode the three possible values.

R=svenpanne@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9372016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10654 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-09 09:43:37 +00:00
mstarzinger@chromium.org
8c12b6b743 Implement target cache for constructor calls. 
This caches call targets of constructor calls by associating one element
caches with call sites. The type feedback oracle can use the recorded
valued to gather type information for monomorphic constructor call sites.

R=kmillikin@chromium.org,vegorov@chromium.org

Review URL: https://chromiumcodereview.appspot.com/8932004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10531 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-27 13:03:19 +00:00
yangguo@chromium.org
6d0d6a5695 Recursion limit for one-char string replace and retire String::kMinNonFlatLength. 
TEST=mjsunit/string-replace-one-char.js

Review URL: https://chromiumcodereview.appspot.com/9231017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10422 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-17 14:29:17 +00:00
vegorov@chromium.org
7370cf6f9d Fix and enable NEW_NON_STRICT_FAST ArgumentsAccess stub on x64. 
R=fschneider@chromium.org
BUG=v8:1903

Review URL: http://codereview.chromium.org/9179010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10411 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-16 15:11:56 +00:00
erik.corry@gmail.com
70da367f6b More spelling changes. 
Review URL: http://codereview.chromium.org/9231009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10407 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-16 12:38:59 +00:00
erik.corry@gmail.com
b3e0761e38 Cosmetic changes ("set up" is a verb, "setup" is a noun). 
Review URL: http://codereview.chromium.org/9139051

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10399 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-13 13:09:52 +00:00
vegorov@chromium.org
74ef753067 Change inlined cache of intanceof stub to use indirection through cell. 
The stub was directly patching caller's code without issuing write barrier which violated incremental marking invariants.

R=mstarzinger@chromium.org
BUG=http://crbug.com/109448
TEST=cctest/test-heap/InstanceOfStubWriteBarrier

Review URL: http://codereview.chromium.org/9158015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10380 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-11 09:39:37 +00:00
erik.corry@gmail.com
dc9910f4a4 Minor cleanups of numeric seeded hashing patch. 
Review URL: http://codereview.chromium.org/9155010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10367 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-10 13:24:18 +00:00
erik.corry@gmail.com
0aff6c26d3 Fix zero hash handling on ARM. 
Some cleanup.
Review URL: http://codereview.chromium.org/9169010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10362 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-10 12:01:04 +00:00
erik.corry@gmail.com
81a0271004 Randomize the seed used for string hashing. This helps guard against 
CPU-eating DOS attacks against node.js servers.  Based on code from
Bert Belder.  This version only solves the issue for those that compile
V8 themselves or those that do not use snapshots.  A snapshot-based
precompiled V8 will still have predictable string hash codes.
Review URL: http://codereview.chromium.org/9086006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10330 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-04 15:12:15 +00:00
yangguo@chromium.org
4ed4a7a652 Porting r10252 to x64 (handle external strings in generated code when concatenating short strings). 
Review URL: http://codereview.chromium.org/8909004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10261 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-15 10:59:39 +00:00
yangguo@chromium.org
03696ca765 Porting r10221 to x64 (avoid bailing out to runtime for short substrings). 
Review URL: http://codereview.chromium.org/8894001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10251 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-14 10:26:24 +00:00
ricow@chromium.org
ec66c36fbf Reland 10216 - Optimize the equality check case of ICCompare stubs. 
Now with arm and x64 support. Additionally, added default unreachable case to switch statement in CompareIC::TargetState to make win and mac compilers happy.

Reviewer guide:
This is an exact copy of 10216 except:
src/arm/*
src/x64/*
src/ic.cc (added default case to swith in CompareIC::TargetState)
Review URL: http://codereview.chromium.org/8872060

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10219 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-09 09:26:14 +00:00
yangguo@chromium.org
30a2c00da5 Tweaks on Math.pow (ia32 and x64). 
Review URL: http://codereview.chromium.org/8831008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10203 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-07 16:15:18 +00:00
yangguo@chromium.org
10675502f8 Tweak to shorten generated code in Math.pow. 
Review URL: http://codereview.chromium.org/8834007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10189 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-07 09:44:31 +00:00
yangguo@chromium.org
c9c9ea676b Porting Math.pow changes to x64. 
TEST=math-pow.js, regress-397.js

Review URL: http://codereview.chromium.org/8821019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10185 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-07 08:34:27 +00:00
yangguo@chromium.org
d542a2fb75 Add external strings support to regexp in generated code. 
TEST=test/mjsunit/string-external-cached.js

Review URL: http://codereview.chromium.org/8680010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10070 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-25 14:04:47 +00:00
yangguo@chromium.org
dcc05b9fca Implement Math.tan in generated code. 
Review URL: http://codereview.chromium.org/8700004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10067 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-25 13:15:31 +00:00
yangguo@chromium.org
50e5aaa73f Catch non-string subject in RegExpExecStub. 
There is no test case to trigger any crash. This is only to guard against the case that the native function is called with unsafe arguments.

Review URL: http://codereview.chromium.org/8554004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10064 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-24 18:36:24 +00:00
keuchel@chromium.org
1e9a7267ab Introduce extended mode. 
This CL introduces a third mode next to the non-strict
(henceforth called 'classic mode') and 'strict mode'
which is called 'extended mode' as in the current
ES.next specification drafts. The extended mode is based on
the 'strict mode' and adds new functionality to it. This
means that most of the semantics of these two modes
coincide.

The 'extended mode' is entered instead of the 'strict mode'
during parsing when using the 'strict mode' directive
"use strict" and when the the harmony-scoping flag is
active. This should be changed once it is fully specified how the 'extended mode' is entered.

This change introduces a new 3 valued enum LanguageMode
(see globals.h) corresponding to the modes which is mostly
used by the frontend code. This includes the following
components:
* (Pre)Parser
* Compiler
* SharedFunctionInfo, Scope and ScopeInfo
* runtime functions: StoreContextSlot,
  ResolvePossiblyDirectEval, InitializeVarGlobal,
  DeclareGlobals

The old enum StrictModeFlag is still used in the backend
when the distinction between the 'strict mode' and the 'extended mode' does not matter. This includes:
* SetProperty runtime function, Delete builtin
* StoreIC and KeyedStoreIC
* StubCache

Review URL: http://codereview.chromium.org/8417035

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10062 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-24 15:17:04 +00:00
yangguo@chromium.org
198e33560b Porting r10023 and r10054 to x64 (pointer cache for external strings). 
Review URL: http://codereview.chromium.org/8662009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10058 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-24 10:16:39 +00:00
mstarzinger@chromium.org
d7e099889e Implement code stub for object literal creation. 
This generates code stubs for cloning of shallow object literal
boilerplates that have no elements and only fast properties. Improves
splay performance because object literals are created frequently.

R=fschneider@chromium.org

Review URL: http://codereview.chromium.org/8598014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10036 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-11-21 13:27:44 +00:00