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348 Commits

Author SHA1 Message Date
yangguo@chromium.org
6b489d9753 Improve String::WriteAscii and add PRESERVE_ASCII_NULL option. 
The PRESERVE_ASCII_NULL option prevents WriteAscii from converting
\0 to white space.

R=verwaest@chromium.org
BUG=v8:2252
TEST=test-api/StringWrite

Review URL: https://chromiumcodereview.appspot.com/10810056

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12174 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-23 14:22:46 +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
yangguo@chromium.org
791632cf06 Fix compilation when disabling debugger support. 
Based on a patch by Remi Duraffort <remi.duraffort@st.com>: http://codereview.chromium.org/10702093/

R=mstarzinger@chromium.org
BUG=
TEST=build with debuggersupport=off

Review URL: https://chromiumcodereview.appspot.com/10697085

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11995 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-07-05 16:23:14 +00:00
rossberg@chromium.org
680797234c Further extend TypedArray support in d8: 
- Add copy constructors.
- Add subarray methods.
- Make instanceof and constructor property work.
- Rename PixelArray to Uint8ClampedArray.

Also fix broken definition of assertInstanceof in MJSUnit test harness.

R=mstarzinger@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10558005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11949 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-06-28 16:29:53 +00:00
alexeif@chromium.org
c1944660f5 Implement heap profiler memory usage reporting. 
Review URL: https://chromiumcodereview.appspot.com/10535096

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11793 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-06-13 11:02:24 +00:00
mstarzinger@chromium.org
81e8aa0016 Implement implicit instance checks for API accessors. 
This allows to specify a constructor against which an implicit instance
check is performed for API accessors. If the receiver is incompatible,
an implicit TypeError is thrown and no callback is invoked.

R=svenpanne@chromium.org
BUG=v8:2075
TEST=cctest/test-api/InstanceCheckOn[*]

Review URL: https://chromiumcodereview.appspot.com/10442129

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11734 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-06-08 07:45:11 +00:00
loislo@chromium.org
463a6ffdd4 Expose last seen heap object id via v8 public api. 
BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10444137

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11702 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-06-01 16:10:52 +00:00
yangguo@chromium.org
70408d49b1 Define V8_EXPORT to nothing for clients of v8. 
This is to make sure that inline functions are only exported by
libv8.so and not also by all clients. This is the v8 version of
https://chromiumcodereview.appspot.com/10386108/

This CL depends on http://codereview.chromium.org/10310156/ landing
first.

BUG=chromium:90078

Review URL: https://chromiumcodereview.appspot.com/10399036

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11590 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-05-18 09:52:09 +00:00
mstarzinger@chromium.org
6aeed46180 Make String::Empty inlineable. 
R=svenpanne@chromium.org
TEST=cctest/test-api/StringEmpty

Review URL: https://chromiumcodereview.appspot.com/10199019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11429 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-25 08:45:45 +00:00
mstarzinger@chromium.org
c25a92d76b Make Isolate::GetData and Isolate::SetData inlineable. 
R=svenpanne@chromium.org
TEST=cctest/test-api/IsolateEmbedderData

Review URL: https://chromiumcodereview.appspot.com/10196013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11426 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-24 14:37:53 +00:00
mstarzinger@chromium.org
5113cc1bbc Make static API getters inlineable again. 
This relands r11376 with minor fixes for Windows where offsets are
slightly different from Linux for unaligned fields.

R=svenpanne@chromium.org
TEST=cctest/test-api/StaticGetters

Review URL: https://chromiumcodereview.appspot.com/10176004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11417 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-23 15:09:59 +00:00
mstarzinger@chromium.org
0f590eb45f Revert r11376 and r11379 due to compile failures on Windows. 
TBR=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10116030

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11380 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-18 17:49:53 +00:00
mstarzinger@chromium.org
841158fb6a Fix presubmit failure in r11376. 
R=jkummerow@chromium.org
TEST=cctest/test-api/StaticGetters[AfterDeath]

Review URL: https://chromiumcodereview.appspot.com/10021057

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11379 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-18 17:18:56 +00:00
mstarzinger@chromium.org
3b3e701a27 Make static API getters inlineable. 
R=danno@chromium.org
TEST=cctest/test-api/StaticGetters[AfterDeath]

Review URL: https://chromiumcodereview.appspot.com/10116024

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11376 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-18 16:07:08 +00:00
mstarzinger@chromium.org
a13e41f328 Make Value::IsUndefined and Value::IsNull inlineable. 
R=danno@chromium.org
TEST=cctest/test-api

Review URL: https://chromiumcodereview.appspot.com/10091035

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11375 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-18 15:51:34 +00:00
loislo@chromium.org
b2024c531c Push heap stats as HeapStatsUpdate struct instead of raw array of uint32_t values. 
We are pushing stats data as a raw array of uint32_t values at the moment.
It makes tricky the process of updating the API between v8 and WebKit.

BUG=none
TEST=HeapSnapshotObjectsStats

Review URL: https://chromiumcodereview.appspot.com/10110001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11355 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-17 13:10:17 +00:00
yurys@chromium.org
1ce7d5d0d4 Add method for resolving SnapshotObjectId by given object 
Review URL: https://chromiumcodereview.appspot.com/10094011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11339 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-16 15:36:19 +00:00
loislo@chromium.org
17632e447c Add size metric into Heap Stats. 
The stats data have only count field at the moment.
A constantly growing array of integers also can be a reason of a leak.
Ans we have to have a way to detect such kind of leaks.

Drive by fix:
FindObject and AddEntry were replaced with FindEntry/FindOrAddEntry pair.

BUG=none
TEST=HeapSnapshotObjectsStats

Review URL: https://chromiumcodereview.appspot.com/10086004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11327 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-16 09:44:42 +00:00
alexeif@chromium.org
48777a7f5b Split nodes and edges into separate arrays in heap snapshot serialization. 
Review URL: https://chromiumcodereview.appspot.com/10037004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11315 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-13 12:50:48 +00:00
jkummerow@chromium.org
f0ea13846d Provide empty default implementation of OutputStream::WriteUint32Chunk to make Webkit V8 bindings compile 
Review URL: https://chromiumcodereview.appspot.com/10084001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11311 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-13 10:57:17 +00:00
mstarzinger@chromium.org
20777bf0c5 Fix several ancient presubmit failures. 
R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10038046

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11308 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-13 09:58:29 +00:00
mstarzinger@chromium.org
2f732c2728 Add isolate accessor to AccessorInfo and Arguments. 
This passes the isolate through to API callback functions so that it is
available through AccessorInfo and Arguments. This allows bindings to
avoid unnecessary TLS lookups to retrieve the current isolate.

R=danno@chromium.org
TEST=cctest/test-api,cctest/test-accessors

Review URL: https://chromiumcodereview.appspot.com/10069050

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11306 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-13 09:38:00 +00:00
loislo@chromium.org
d1f83dd95a This patch is introducing a way to grab heap stats. 
The idea is to monitor the heap regulary and track each object in the heap.
With this data we will be able do draw heap usage diagram.
Where X is time and Y is the number of objects.

BUG=none
TEST=HeapSnapshotObjectsStats

Review URL: https://chromiumcodereview.appspot.com/10049002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11302 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-13 08:52:25 +00:00
erik.corry@gmail.com
a3629daa2c Fix external allocated memory accounting to use 64 bit values on 
64 bit architectures.
Review URL: https://chromiumcodereview.appspot.com/10020032

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11265 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-04-11 09:23:57 +00:00
loislo@chromium.org
b84b44d86c This value is required for showing the heap snapshot delta in Summary view of DevTools.Profiler. 
At the moment it is evaluating on the front-end side and this is cost us 2 * (load time + parse time + traverse via snapshot) because I need this value for two previous snapshots.

BUG=none
TEST=test-heap-profiler

Review URL: https://chromiumcodereview.appspot.com/9858016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11161 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-27 11:54:47 +00:00
loislo@chromium.org
9b9e458a43 Revert "This value is required for showing the heap snapshot delta in Summary view of DevTools.Profiler." 
This reverts commit 634864d65ebe820a967f6162d8e226cf4a73e51a.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9861018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11158 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-27 11:12:31 +00:00
loislo@chromium.org
410f3a3375 This value is required for showing the heap snapshot delta in Summary view of DevTools.Profiler. 
At the moment it is evaluating on the front-end side and this is cost us 2 * (load time + parse time + traverse via snapshot) because I need this value for two previous snapshots.

BUG=none
TEST=test-heap-profiler

Review URL: https://chromiumcodereview.appspot.com/9858016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11150 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-27 08:52:00 +00:00
loislo@chromium.org
b414adb1f3 Complete switch to SnapshotObjectId. 
BUG=none
TEST=test-heap-profiler

Review URL: https://chromiumcodereview.appspot.com/9858010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11145 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-26 13:47:37 +00:00
erik.corry@gmail.com
bcd0fd00e3 Add API call that identifies strings that are guaranteed 
only to contain ASCII characters.
Review URL: https://chromiumcodereview.appspot.com/9724022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11079 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-19 09:51:36 +00:00
rossberg@chromium.org
8604da7f06 New class for Date objects: caches individual date components. 
First step, cache slots not used yet.

R=ulan@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9117034

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10981 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-09 11:11:55 +00:00
vegorov@chromium.org
47b6027c37 Add HeapProfiler::GetPersistentHandleCount to be able to track the number of persistent handles 
It turns out that an increasing number of persistent handles is a good signal for bugs in the bindings layer

BUG=none
TEST=cctest/test-heap-profiler/PersistentHandleCount

Review URL: https://chromiumcodereview.appspot.com/9620007
Patch from Jochen Eisinger <jochen@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10960 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-03-07 17:38:50 +00:00
mikhail.naganov@gmail.com
2350d11dac Remove now unused CalculateExactRetainedSize function & co. 
This patch changes the signature of the v8::HeapGraphNode::GetRetainedSize method, but it's not used in Chromium, and it should be easy for other clients (if any) to adjust to this change.

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9466014
Patch from Alexei Filippov <alexeif@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10846 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-27 15:42:36 +00:00
vegorov@chromium.org
c112fdc398 Adds a new API where the host can supply a callback function. The callback function can resolve the location of a return address on stack to the location where a return-address rewriting profiler stashed the original return address. 
Review URL: https://chromiumcodereview.appspot.com/9401019
Patch from Sigurður Ásgeirsson <siggi@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10845 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-27 15:15:53 +00:00
mstarzinger@chromium.org
36a91e30f7 Fix redefining of attributes on aliased arguments. 
This allows elements of the non-strict arguments object to be redefined
with custom attributes and still maintain an alias into the context.
Such a slow alias is maintained by placing a special marker into the
dictionary backing store of the arguments object.

R=rossberg@chromium.org
BUG=v8:1772
TEST=test262,mjsunit/object-define-property

Review URL: https://chromiumcodereview.appspot.com/9460004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10827 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-24 14:34:01 +00:00
rossberg@chromium.org
1336b913d0 Make built-ins strict mode conforming, and support a --use-strict flag. 
* Turned all uses of 'const' into 'var'.
* Turned all uses of local 'function' into 'var'.
* Added a couple of missing toplevel 'var' declarations.

One consequence is that the properties on the builtin object  are no longer
non-writable, and I had to adapt one test. Is that a problem?

Unfortunately, we cannot actually switch the library scripts to strict mode
by default, because that makes observable things like poisoned .caller properties
for library functions.

Also removed dead flag code in Compiler::Compile.

R=yangguo@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9415010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10758 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-20 13:48:24 +00:00
jkummerow@chromium.org
0177aa62da Count ICs that have type information. 
Hidden behind --type-info-threshold=X flag, usage dependent on experimental profiler.

Review URL: https://chromiumcodereview.appspot.com/9403009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10753 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-20 12:57:23 +00:00
loislo@chromium.org
dc3f16a321 I will apply it to the nodes that can't be mapped to Heap object or Native object. 
As example there are 'Detached DOM Tree' nodes in WebKit. It is very useful to be able to see all such
nodes grouped together. It can be done with help of some post processing but I did this explicitly
on v8 side because it is much faster. At the moment this kind of nodes has kNative type.
I'd like to hide these nodes from the Retainment View but I can filter them only by name.

BUG=none
TEST=HeapSnapshotRetainedObjectInfo

Review URL: https://chromiumcodereview.appspot.com/9323064

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10614 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-07 05:21:00 +00:00
yurys@chromium.org
882ede3053 Add a getter for value set with AllowCodeGenerationFromStrings 
Review URL: https://chromiumcodereview.appspot.com/9223016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10578 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-02-01 12:58:34 +00:00
loislo@chromium.org
07d720ec41 Detailed heap snapshot usability improvement. 
The detailed heap snapshot has two groups of nodes. The first one
is the group for v8 heap nodes and the second one is the group for
native objects. At the moment we have two different sets of native
objects. There are 'Detached DOM trees' and 'Document DOM trees' type of objects.

I think it'd be nice to replace one group containing all native objects with
separate groups for different types of native objects.

BUG=none
TEST=HeapSnapshotRetainedObjectInfo

Review URL: https://chromiumcodereview.appspot.com/9223009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10528 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-27 12:02:57 +00:00
yurys@chromium.org
09ff5c4c44 Provide access to function inferred name in v8 public API 
Review URL: https://chromiumcodereview.appspot.com/9146039

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10499 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-25 12:45:54 +00:00
kmillikin@chromium.org
12f982cf6a Include what you use in accessors.{h,cc}. 
R=fschneider@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9113041

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10493 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-25 00:16:07 +00:00
erik.corry@gmail.com
b0607b7127 Fix bug 542, misleading documentation of v8::Locker. 
Review URL: https://chromiumcodereview.appspot.com/9160028

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10488 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-24 13:07:21 +00:00
yurys@chromium.org
ebb75c23a1 Provide a way for iterating through all external strings referenced from the JS heap 
Review URL: http://codereview.chromium.org/9139018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10400 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-13 15:14:45 +00:00
svenpanne@chromium.org
6997dbe13e Fixed AccessorPair handling 
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10372 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-10 16:12:16 +00:00
yangguo@chromium.org
d9f7cf819c Implement callback when script finishes running in V8 API. 
TEST=test-api/LeaveScriptCallback

Review URL: http://codereview.chromium.org/8937003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10323 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2012-01-04 08:48:35 +00:00
mikhail.naganov@gmail.com
dae713f0ad Reapply r10158: Distinguish weak references in heap snapshots, group GC roots. 
[Fixed the bug revealed by the Win32 bot]

Several changes to better organize snapshot data:

1. Provide information about weak references.
2. Group (GC roots) children.
3. Prettify debug snapshot printing.

BUG=v8:1832
TEST=cctest/test-heap-profiler/*Weak*
TBR=vitalyr@chromium.org

Initial CL: http://codereview.chromium.org/8716009

Review URL: http://codereview.chromium.org/8822019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10182 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2011-12-06 17:41:47 +00:00