[v8-users] Building in VS2013 fails for cctest project

2013-12-24 Thread ioannis 
Building in VS2013 fails for cctest project with the following warnings 
treated as error.

8test-cpu-profiler.cc(57): error C2220: warning treated as error - no 
'object' file generated
8test-cpu-profiler.cc(57): warning C4316: 
'v8::internal::ProfilerEventsProcessor' : object allocated on the heap may 
not be aligned 64
8test-cpu-profiler.cc(145): warning C4316: 
'v8::internal::ProfilerEventsProcessor' : object allocated on the heap may 
not be aligned 64
8test-cpu-profiler.cc(207): warning C4316: 
'v8::internal::ProfilerEventsProcessor' : object allocated on the heap may 
not be aligned 64
8test-cpu-profiler.cc(276): warning C4316: 
'v8::internal::ProfilerEventsProcessor' : object allocated on the heap may 
not be aligned 64

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[v8-users] Re: V8 how to swallow javascript uncaught exception and continue running script

2013-11-08 Thread ioannis 
Well you obviously need to catch the error raised on the javascript side 
and not on the c++ side

try { 
document.write('foo');
} catch (e) {
//handle error
} finally {
//cleanup
}
var str = 'hello' + 'world';



On Friday, November 8, 2013 9:56:23 AM UTC+2, Michael demiGod wrote:

 script:

 1 document.write('foo');

 2 var str = 'hello' + 'world';

 3 ...


 cpp:

 v8::TryCatch try_catch;

 v8::Handle result = script-Run();


 result:

 test.js:1: Uncaught ReferenceError: document is not defined


 Although I can use v8::trycatch to get exception info, I'll miss the 
 following script.

 Is there any way to continue running script and get 'helloworld', ignoring 
 the Uncaught ReferenceError of first line?


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[v8-users] Re: Overloading operators on the JS side

2013-10-30 Thread ioannis 


I think what you need is: ObjectTemplate::SetIndexedPropertyHandler


On Wednesday, October 30, 2013 8:39:54 PM UTC+2, Flying Jester wrote:

 Let's say I have an object on the C++ side that is wrapped for use in JS. 
 It has several member functions attached to its prototype. Is there a way 
 to allow this object to be used, for instance, just like an array as well 
 on the JS side, which will access values specified on the C++ side?

 Like this:
 (js)

 var byteArrayObject = new byteArray(Some String); //constructor defined 
 in C++. It now holds the string as a series of bytes.

 var stringy = byteArrayObject.CreateString(); //stringy now holds Some 
 String. This is simple to make work.

 var thirdCharacter = byteArrayObject[2]; //thirdCharacter holds m.

 (/js)

 How would this be done? Is there a way to modify how operators like 
 brackets (or more generally, any operator) on the JS side handle objects 
 created from constructors that are defined in C++?


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Re: [v8-users] Gargabe Collector initiated in a worker thread is causing me a crash

2013-10-20 Thread ioannis 
Okay, after a lot of trial and error, i think i got the hang of it... Had 
to use both Locker and Unlocker to get it to work.

On Thursday, October 10, 2013 5:28:52 PM UTC+3, ioannis wrote:

 Well, you make it sound soo easy ...
 I have read the documentation in v8.h and how it was done in d8.cc but i 
 still cant get ti to work.
  

 On Wednesday, October 9, 2013 11:37:50 AM UTC+3, Ben Noordhuis wrote:

 On Wed, Oct 9, 2013 at 4:15 AM, ioannis ioan...@gmail.com wrote: 
  Ok, so i'm going nuts here, v8 v. 
  
  I have a worker thread that is executed based on events raised from my 
  object. 
  
  The thread uses the same isolate and context from the JS object 
  
  So the thread is initiated like below and is working. 
  
  
  Isolate* isolate = object_-isolate_; 
  Isolate::Scope isolate_scope(isolate); 
  HandleScope handle_scope(isolate); 
  Context::Scope context_scope(isolate-GetCurrentContext()); 
  
  ... 
  
  LocalObject new_obj(obj_templ-NewInstance());  
  
  
  The problem arises when v8 runs out of memory and v8 calls the garbage 
  collector 
  
  to free some space before creating the object. Then i get a crush: 
  
  
  # 
  # Fatal error in ..\..\src\frames.cc, line 1333 
  # CHECK(it.done()) failed 
  # 
  
  
  With the following stack: 
  
v8::internal::OS::DebugBreak() Line 953 C++ 
v8::internal::OS::Abort() Line 941 C++ 
V8_Fatal(0x00efa784, 1333, 0x00efa770, ...) Line 86 C++ 
v8::internal::EntryFrame::Iterate(0x04c2e498) Line 1333 C++ 
v8::internal::Isolate::Iterate(0x04c2e498, 0x017b4e8c) Line 497 C++ 
v8::internal::Isolate::Iterate(0x04c2e498) Line 508 C++ 
v8::internal::Heap::IterateStrongRoots(0x04c2e498, 
 VISIT_ALL_IN_SCAVENGE) 
  Line 6383 C++ 
v8::internal::Heap::IterateRoots(0x04c2e498, VISIT_ALL_IN_SCAVENGE) 
 Line 
  6357 C++ 
  v8::internal::Heap::Scavenge() Line 1395 C++ 
v8::internal::Heap::PerformGarbageCollection(SCAVENGER, 0x04c2e568) 
 Line 
  958 C++ 
v8::internal::Heap::CollectGarbage(NEW_SPACE, SCAVENGER, 0x00e23fb0, 
  0x) Line 681 C++ 
v8::internal::Heap::CollectGarbage(NEW_SPACE, 0x00e23fb0) Line 546 
 C++ 
v8::internal::CopyAddConstantDescriptor({...}, {...}, {...}, FROZEN, 
  OMIT_TRANSITION) Line 1991 C++ 
v8::internal::JSObject::AddConstantProperty({...}, {...}, {...}, 
 FROZEN, 
  INSERT_TRANSITION) Line 2011 C++ 
v8::internal::JSObject::AddProperty({...}, {...}, {...}, FROZEN, 
  kNonStrictMode, MAY_BE_STORE_FROM_KEYED, PERFORM_EXTENSIBILITY_CHECK, 
  OPTIMAL_REPRESENTATION, ALLOW_AS_CONSTANT, INSERT_TRANSITION) Line 2088 
 C++ 
v8::internal::JSObject::SetPropertyForResult({...}, 0x04c2e828, 
 {...}, 
  {...}, FROZEN, kNonStrictMode, MAY_BE_STORE_FROM_KEYED) Line 3958 C++ 
v8::internal::JSReceiver::SetProperty({...}, 0x04c2e828, {...}) Line 
  3421 C++ 
v8::internal::JSReceiver::SetProperty({...}, {...}, {...}, FROZEN, 
  kNonStrictMode, MAY_BE_STORE_FROM_KEYED) Line 2764 C++ 
v8::internal::Runtime::SetObjectProperty(0x017b3560, {...}, {...}, 
 {...}, 
  FROZEN, kNonStrictMode) Line 5198 C++ 
v8::internal::__RT_impl_Runtime_SetProperty({...}, 0x017b3560) Line 
  5349 C++ 
v8::internal::Runtime_SetProperty(4, 0x04c2e9dc, 0x017b3560) Line 
 5324 C++ 
v8::internal::Invoke(false, {...}, {...}, 2, 0x04c2eb6c, 0x04c2ec5f) 
 Line 
  119 C++ 
v8::internal::Execution::Call(0x017b3560, {...}, {...}, 2, 
 0x04c2eb6c, 
  0x04c2ec5f, false) Line 183 C++ 
v8::internal::Execution::ConfigureInstance(0x017b3560, {...}, {...}, 
  0x04c2ec5f) Line 789 C++ 
v8::internal::Factory::ConfigureInstance({...}, {...}, 0x04c2ec5f) 
 Line 
  1634 C++ 
v8::internal::HandleApiCallHelper1({...}, 0x017b3560) Line 1164 C++ 
v8::internal::Builtin_Impl_HandleApiCallConstruct({...}, 0x017b3560) 
 Line 
  1221 C++ 
v8::internal::Builtin_HandleApiCallConstruct(2, 0x04c2ecbc, 
 0x017b3560) 
  Line 1220 C++ 
v8::internal::Invoke(false, {...}, {...}, 1, 0x04c2ee68, 0x04c2eebf) 
 Line 
  119 C++ 
v8::internal::Execution::Call(0x017b3560, {...}, {...}, 1, 
 0x04c2ee68, 
  0x04c2eebf, false) Line 183 C++ 
v8::internal::Execution::InstantiateObject({...}, 0x04c2eebf) Line 
 772 C++ 
v8::ObjectTemplate::NewInstance() Line 5308 C++ 
  
  Can someone help me out here, or give me pointer of what is going wrong 
 here 
  ? 
  Thanks. 

 V8 is not thread-safe by default.  If you are calling into the runtime 
 from different threads, you need to lock appropriately with Locker 
 objects. 



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[v8-users] Re: Customize [[Class]] internal property?

2013-10-14 Thread ioannis 


If you are using the API to build your object then you can try the following:


LocalFunctionTemplate 
func_templ(FunctionTemplate::New());func_templ-SetClassName(String::NewSymbol(ClassName));LocalObjectTemplate
 obj_templ = func_templ-InstanceTemplate();


On Friday, October 11, 2013 5:04:36 AM UTC+3, ChaRles Lew wrote:

 Hi, i've been reading ECMAScript specification recently. I've learned that 
 Object.prototype.toString will generate a string like [object [[Class]]] 
 for objects.
 And I'm curious how can I customize the [[Class]] internal property for my 
 objects. Or shall i just rewrite this method and fake this behavior?

 By the way, in Chrome when this is the window object,
 this.toString() = [object window]
 but
 Object.prototype.toString.call(this) = [object global]
 Hey...The app i'm writing has a similar behavior and will use the global 
 object in a similar way, how shall i avoid [object global] appearing? I 
 want to ensure (at least pretend) its [[Class]] internal property is 
 window etc.

 Looking forward for advice. Thanks.


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Re: [v8-users] Gargabe Collector initiated in a worker thread is causing me a crash

2013-10-10 Thread ioannis 
Well, you make it sound soo easy ...
I have read the documentation in v8.h and how it was done in d8.cc but i 
still cant get ti to work.
 

On Wednesday, October 9, 2013 11:37:50 AM UTC+3, Ben Noordhuis wrote:

 On Wed, Oct 9, 2013 at 4:15 AM, ioannis ioan...@gmail.com javascript: 
 wrote: 
  Ok, so i'm going nuts here, v8 v. 
  
  I have a worker thread that is executed based on events raised from my 
  object. 
  
  The thread uses the same isolate and context from the JS object 
  
  So the thread is initiated like below and is working. 
  
  
  Isolate* isolate = object_-isolate_; 
  Isolate::Scope isolate_scope(isolate); 
  HandleScope handle_scope(isolate); 
  Context::Scope context_scope(isolate-GetCurrentContext()); 
  
  ... 
  
  LocalObject new_obj(obj_templ-NewInstance());  
  
  
  The problem arises when v8 runs out of memory and v8 calls the garbage 
  collector 
  
  to free some space before creating the object. Then i get a crush: 
  
  
  # 
  # Fatal error in ..\..\src\frames.cc, line 1333 
  # CHECK(it.done()) failed 
  # 
  
  
  With the following stack: 
  
v8::internal::OS::DebugBreak() Line 953 C++ 
v8::internal::OS::Abort() Line 941 C++ 
V8_Fatal(0x00efa784, 1333, 0x00efa770, ...) Line 86 C++ 
v8::internal::EntryFrame::Iterate(0x04c2e498) Line 1333 C++ 
v8::internal::Isolate::Iterate(0x04c2e498, 0x017b4e8c) Line 497 C++ 
v8::internal::Isolate::Iterate(0x04c2e498) Line 508 C++ 
v8::internal::Heap::IterateStrongRoots(0x04c2e498, 
 VISIT_ALL_IN_SCAVENGE) 
  Line 6383 C++ 
v8::internal::Heap::IterateRoots(0x04c2e498, VISIT_ALL_IN_SCAVENGE) 
 Line 
  6357 C++ 
  v8::internal::Heap::Scavenge() Line 1395 C++ 
v8::internal::Heap::PerformGarbageCollection(SCAVENGER, 0x04c2e568) 
 Line 
  958 C++ 
v8::internal::Heap::CollectGarbage(NEW_SPACE, SCAVENGER, 0x00e23fb0, 
  0x) Line 681 C++ 
v8::internal::Heap::CollectGarbage(NEW_SPACE, 0x00e23fb0) Line 546 C++ 
v8::internal::CopyAddConstantDescriptor({...}, {...}, {...}, FROZEN, 
  OMIT_TRANSITION) Line 1991 C++ 
v8::internal::JSObject::AddConstantProperty({...}, {...}, {...}, 
 FROZEN, 
  INSERT_TRANSITION) Line 2011 C++ 
v8::internal::JSObject::AddProperty({...}, {...}, {...}, FROZEN, 
  kNonStrictMode, MAY_BE_STORE_FROM_KEYED, PERFORM_EXTENSIBILITY_CHECK, 
  OPTIMAL_REPRESENTATION, ALLOW_AS_CONSTANT, INSERT_TRANSITION) Line 2088 
 C++ 
v8::internal::JSObject::SetPropertyForResult({...}, 0x04c2e828, {...}, 
  {...}, FROZEN, kNonStrictMode, MAY_BE_STORE_FROM_KEYED) Line 3958 C++ 
v8::internal::JSReceiver::SetProperty({...}, 0x04c2e828, {...}) Line 
  3421 C++ 
v8::internal::JSReceiver::SetProperty({...}, {...}, {...}, FROZEN, 
  kNonStrictMode, MAY_BE_STORE_FROM_KEYED) Line 2764 C++ 
v8::internal::Runtime::SetObjectProperty(0x017b3560, {...}, {...}, 
 {...}, 
  FROZEN, kNonStrictMode) Line 5198 C++ 
v8::internal::__RT_impl_Runtime_SetProperty({...}, 0x017b3560) Line 
  5349 C++ 
v8::internal::Runtime_SetProperty(4, 0x04c2e9dc, 0x017b3560) Line 5324 
 C++ 
v8::internal::Invoke(false, {...}, {...}, 2, 0x04c2eb6c, 0x04c2ec5f) 
 Line 
  119 C++ 
v8::internal::Execution::Call(0x017b3560, {...}, {...}, 2, 0x04c2eb6c, 
  0x04c2ec5f, false) Line 183 C++ 
v8::internal::Execution::ConfigureInstance(0x017b3560, {...}, {...}, 
  0x04c2ec5f) Line 789 C++ 
v8::internal::Factory::ConfigureInstance({...}, {...}, 0x04c2ec5f) 
 Line 
  1634 C++ 
v8::internal::HandleApiCallHelper1({...}, 0x017b3560) Line 1164 C++ 
v8::internal::Builtin_Impl_HandleApiCallConstruct({...}, 0x017b3560) 
 Line 
  1221 C++ 
v8::internal::Builtin_HandleApiCallConstruct(2, 0x04c2ecbc, 
 0x017b3560) 
  Line 1220 C++ 
v8::internal::Invoke(false, {...}, {...}, 1, 0x04c2ee68, 0x04c2eebf) 
 Line 
  119 C++ 
v8::internal::Execution::Call(0x017b3560, {...}, {...}, 1, 0x04c2ee68, 
  0x04c2eebf, false) Line 183 C++ 
v8::internal::Execution::InstantiateObject({...}, 0x04c2eebf) Line 772 
 C++ 
v8::ObjectTemplate::NewInstance() Line 5308 C++ 
  
  Can someone help me out here, or give me pointer of what is going wrong 
 here 
  ? 
  Thanks. 

 V8 is not thread-safe by default.  If you are calling into the runtime 
 from different threads, you need to lock appropriately with Locker 
 objects. 


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[v8-users] Re: Issues with a Persistent in a Struct?

2013-10-08 Thread ioannis 


Persistent is defined by default with NonCopyablePersistentTraits which means 
that it cannot be used in structs that allow copy/assignment operations.

You can explicitly define Persistent with CopyablePersistentTraits in order to 
allow copy/assignment operations.


I use the following type definition for cleaner code

typedef PersistentFunction, CopyablePersistentTraitsFunction 
PersistentFunction;



On Tuesday, October 8, 2013 5:55:14 AM UTC+3, Gregory Hlavac wrote:

 1 
  c:\trs\trstrunk\branch\scriptingupdate\gamecore\ScriptedMission.h(49) : 
 see reference to class template instantiation 'v8::PersistentT' being 
 compiled
 1  with
 1  [
 1  T=v8::Function
 1  ]


 So that's the error I'm getting located at this line.


 struct TimerInformation
 {
 int timerRemaining;
 PersistentFunction TimerCompleteCallback;
 };


 Any ideas?


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[v8-users] Gargabe Collector initiated in a worker thread is causing me a crash

2013-10-08 Thread ioannis 


Ok, so i'm going nuts here, v8 v.

I have a worker thread that is executed based on events raised from my object.

The thread uses the *same* isolate and context from the JS object 

So the thread is initiated like below and is working.


Isolate* isolate = object_-isolate_;Isolate::Scope 
isolate_scope(isolate);HandleScope handle_scope(isolate);Context::Scope 
context_scope(isolate-GetCurrentContext());

...

LocalObject new_obj(obj_templ-NewInstance()); 


The problem arises when v8 runs out of memory and v8 calls the garbage collector

to free some space before creating the object. Then i get a crush:


#
# Fatal error in ..\..\src\frames.cc, line 1333
# CHECK(it.done()) failed
#


With the following stack:

v8::internal::OS::DebugBreak() Line 953 C++
v8::internal::OS::Abort() Line 941 C++ V8_Fatal(0x00efa784, 1333, 
0x00efa770, ...) Line 86 C++ v8::internal::EntryFrame::Iterate(0x04c2e498) 
Line 1333 C++ v8::internal::Isolate::Iterate(0x04c2e498, 0x017b4e8c) Line 
497 C++ v8::internal::Isolate::Iterate(0x04c2e498) Line 508 C++ 
v8::internal::Heap::IterateStrongRoots(0x04c2e498, VISIT_ALL_IN_SCAVENGE) 
Line 6383 C++ v8::internal::Heap::IterateRoots(0x04c2e498, 
VISIT_ALL_IN_SCAVENGE) Line 6357 C++ v8::internal::Heap::Scavenge() Line 
1395 C++ v8::internal::Heap::PerformGarbageCollection(SCAVENGER, 
0x04c2e568) Line 958 C++ v8::internal::Heap::CollectGarbage(NEW_SPACE, 
SCAVENGER, 0x00e23fb0, 0x) Line 681 C++ 
v8::internal::Heap::CollectGarbage(NEW_SPACE, 0x00e23fb0) Line 546 C++ 
v8::internal::CopyAddConstantDescriptor({...}, {...}, {...}, FROZEN, 
OMIT_TRANSITION) Line 1991 C++ 
v8::internal::JSObject::AddConstantProperty({...}, {...}, {...}, FROZEN, 
INSERT_TRANSITION) Line 2011 C++ v8::internal::JSObject::AddProperty({...}, 
{...}, {...}, FROZEN, kNonStrictMode, MAY_BE_STORE_FROM_KEYED, 
PERFORM_EXTENSIBILITY_CHECK, OPTIMAL_REPRESENTATION, ALLOW_AS_CONSTANT, 
INSERT_TRANSITION) Line 2088 C++ 
v8::internal::JSObject::SetPropertyForResult({...}, 0x04c2e828, {...}, 
{...}, FROZEN, kNonStrictMode, MAY_BE_STORE_FROM_KEYED) Line 3958 C++ 
v8::internal::JSReceiver::SetProperty({...}, 0x04c2e828, {...}) Line 3421 
C++ v8::internal::JSReceiver::SetProperty({...}, {...}, {...}, FROZEN, 
kNonStrictMode, MAY_BE_STORE_FROM_KEYED) Line 2764 C++ 
v8::internal::Runtime::SetObjectProperty(0x017b3560, {...}, {...}, {...}, 
FROZEN, kNonStrictMode) Line 5198 C++ 
v8::internal::__RT_impl_Runtime_SetProperty({...}, 0x017b3560) Line 5349 
C++ v8::internal::Runtime_SetProperty(4, 0x04c2e9dc, 0x017b3560) Line 5324 
C++ v8::internal::Invoke(false, {...}, {...}, 2, 0x04c2eb6c, 0x04c2ec5f) 
Line 119 C++ v8::internal::Execution::Call(0x017b3560, {...}, {...}, 2, 
0x04c2eb6c, 0x04c2ec5f, false) Line 183 C++ 
v8::internal::Execution::ConfigureInstance(0x017b3560, {...}, {...}, 
0x04c2ec5f) Line 789 C++ v8::internal::Factory::ConfigureInstance({...}, 
{...}, 0x04c2ec5f) Line 1634 C++ 
v8::internal::HandleApiCallHelper1({...}, 0x017b3560) Line 1164 C++ 
v8::internal::Builtin_Impl_HandleApiCallConstruct({...}, 0x017b3560) Line 
1221 C++ v8::internal::Builtin_HandleApiCallConstruct(2, 0x04c2ecbc, 
0x017b3560) Line 1220 C++ v8::internal::Invoke(false, {...}, {...}, 1, 
0x04c2ee68, 0x04c2eebf) Line 119 C++ 
v8::internal::Execution::Call(0x017b3560, {...}, {...}, 1, 0x04c2ee68, 
0x04c2eebf, false) Line 183 C++ 
v8::internal::Execution::InstantiateObject({...}, 0x04c2eebf) Line 772 C++ 
v8::ObjectTemplate::NewInstance() Line 5308 C++ 

Can someone help me out here, or give me pointer of what is going wrong 
here ?
Thanks.

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Re: [v8-users] Setter/Getter for function turns function into a string when the function is called?

2013-10-06 Thread ioannis 
As far as i understand *correct me if i'am wrong* you cannot have an object 
member to act as both a property (using getter/setter) and a calling 
function.
It should be one of the two.

So i guess you will need an object member, a property to get/set the update 
value string and another object member, a function that uses the 
property. 

On Sunday, October 6, 2013 8:59:54 PM UTC+3, James Lomax wrote:

 Oh yeah, I should go read the docs, thanks : )


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Re: [v8-users] Setter/Getter for function turns function into a string when the function is called?

2013-10-06 Thread ioannis 
Ah yes you are right, i didn't read the post to its entirety, i just 
assumed that you were setting the value to a string for some unknown reason 
:) ...
Sorry, apologies for the confusion.

On Sunday, October 6, 2013 11:43:21 PM UTC+3, James Lomax wrote:

 You can, the problem was just that I was using a handle which went out of 
 scope to manage the function. It works because functions are just objects 
 in JavaScript and you can call them as such.

 I'm AFK ATM but I just pulled the below stuff from my dropbox mess-about 
 project if you want to see the final working code.

 http://pastebin.com/FTXkGmcx



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Re: [v8-users] How does v8 decide when to do garbage collection?

2013-09-29 Thread ioannis 
Thanks for the pointers.
This would mean that i need to keep a record of all the objects that have 
been created dynamically and rebuild the relationships on every GC.
Isn't this a bit expensive ?

I was thinking something simpler by setting/removing the Weak flag on the 
parent object depending on the children object count, similar to node's 
ObjectWrap

https://github.com/joyent/node/blob/master/src/node_object_wrap.h

The question is how expensive is this ?

The downside of this method it would take multiple GC cycles to clear the 
whole object tree, as it would process one level at a time...

On Saturday, September 28, 2013 11:08:36 AM UTC+3, Ben Noordhuis wrote:


 A full example is a bit too involved for me to type out on a Saturday 
 morning (before my morning coffee, even) but what you probably want is 
 to declare the parent/child relationship as an object group. 

 You can establish one by adding a GCPrologueCallback with 
 v8::V8::AddGCPrologueCallback().  In that callback, you define the 
 relationship with v8::V8::SetObjectGroupId() and 
 v8::V8::SetReferenceFromGroup().  Check include/v8.h for more details. 
  You can find examples in test/cctest/test-api.cc and a few others. 


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Re: [v8-users] How does v8 decide when to do garbage collection?

2013-09-27 Thread ioannis 
So i'm going to piggyback this post for some additional questions...

1) Is it safe to call v8::V8::IdleNotification() within a WeakCallback() to 
scavenge additional objects that have been set as weak in WeakCallback() ?
I guess not.. i get a crash.

2) Also, lets say within a function scope if an object is declared local 
but it is set as Weak i'm experiencing a behavior that the object becomes 
garbage collected although it is still in scope... ie

function foo() {
  var obj; //declared as weak on instantiation
  for (...) {
var child_obj; //child object of obj also declared as weak on 
instantiation
   * //at some point obj although in scope becomes garbage collected*
  }
}

So is this an expected behavior or i'm i experiencing a bug ?
Thanks.


On Friday, September 27, 2013 1:52:27 PM UTC+3, Ben Noordhuis wrote:

 On Fri, Sep 27, 2013 at 12:04 PM, Craig Thomson 
 cr...@craigthomson.me.uk javascript: wrote: 
  Hi, 
  
  I am trying to understand a bit of the v8 source to do with garbage 
  collection and I am hoping that someone can give me a pointer in the 
 right 
  direction. 
  
  How does v8 decide when to do Garbage collection? Is there a timer, or 
 is it 
  based on how much code is executed or something more complicated? 
  
  Cheers, 
  Craig 

 Memory pressure, basically.  When an allocation fails because the JS 
 heap is full, that's when V8 starts collecting garbage.  (The actual 
 algorithm is more complicated, of course; it may also choose to grow 
 the JS heap, for instance.) 

 Embedders can call v8::V8::IdleNotification() to hint that now is a 
 good time to do some scavenging. 


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Re: [v8-users] How does v8 decide when to do garbage collection?

2013-09-27 Thread ioannis 
Ben thanks for the reply...

For q1) i figured as much...

For q2) Hmm. indeed you are right, although an object may be in scope if it 
is not referenced after the point where GC is initiated then it is eligible 
for garbage collection.
Is there a way to ensure that an object remains valid throughout the 
function scope irrespective if it is referenced or not ?

Furthermore which is the best way to establish parent/child relationships 
between objects (with respect to garbage collection) ?
Please provide a full cycle example if possible.

On Friday, September 27, 2013 10:46:21 PM UTC+3, Ben Noordhuis wrote:

 On Fri, Sep 27, 2013 at 7:40 PM, ioannis ioan...@gmail.com javascript: 
 wrote: 
  So i'm going to piggyback this post for some additional questions... 
  
  1) Is it safe to call v8::V8::IdleNotification() within a WeakCallback() 
 to 
  scavenge additional objects that have been set as weak in WeakCallback() 
 ? 
  I guess not.. i get a crash. 

 Your WeakCallback is invoked when V8 is in the middle* of a GC cycle 
 so no, it's not safe to call v8::V8::IdleNotification(). 

 * A post-processing step, actually. 

  2) Also, lets say within a function scope if an object is declared local 
 but 
  it is set as Weak i'm experiencing a behavior that the object becomes 
  garbage collected although it is still in scope... ie 
  
  function foo() { 
var obj; //declared as weak on instantiation 
for (...) { 
  var child_obj; //child object of obj also declared as weak on 
  instantiation 
  //at some point obj although in scope becomes garbage collected 
} 
  } 
  
  So is this an expected behavior or i'm i experiencing a bug ? 
  Thanks. 

 If the reference is not actually used, then yes, it's eligible for 
 garbage collection. 


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[v8-users] Re: Making v8::Persistent safe to use

2013-09-16 Thread ioannis 
So with the resent changes to Persistent how can we store a series of 
PersistentFunction handles to an STL container like map ?

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[v8-users] Re: New feature: handle eternalization

2013-09-16 Thread ioannis 
Shouldn't the use of Handle and Local be interchangeable ?
Has it been decided which of the two will be depreciated in the end ?

It seems that we cannot assign a Handle value to the Eternal and we need 
to use Local instead ...

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[v8-users] Re: BooleanObject::New(false) always returns true

2013-07-29 Thread ioannis 


So if i understand correctly, in order to obtain the underlying value of a 
BooleanObject, i need to first cast the Value to BooleanObject and then call 
BooleanValue()

Do we need to perform the same casting from Value to NumberObject and 
StringObject to correctly obtain the underlying value ? 


LocalValue false_value = BooleanObject::New(false);LocalBooleanObject 
false_boolean_object = false_value.AsBooleanObject();bool false_bool = 
false_boolean_object-BooleanValue(); // = false

 LocalValue true_value = BooleanObject::New(true);LocalBooleanObject 
true_boolean_object = true_value.AsBooleanObject();bool true_bool = 
true_boolean_object-BooleanValue(); // = true


Thank you for the unit tests, that cleared out the but i think for the 
primitive_true test it is just a copy of the primitive_false test.

+  LocalValue primitive_true = Boolean::New(true);+  
CHECK(primitive_true-IsBoolean());+  
CHECK(!primitive_true-IsBooleanObject());+  
CHECK(primitive_true-BooleanValue());+  CHECK(primitive_true-IsTrue());+  
CHECK(!primitive_true-IsFalse());

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[v8-users] BooleanObject::New(false) always returns true

2013-07-28 Thread ioannis 
I was wandering why the following BooleanValue() statements always return 
true, shouldn't the first one return false ?
Also why both IsTrue() and IsFalse() return false in the statements below ?
Is there a bug or am i missing something here ?

bool test0 = BooleanObject::New(false)-BooleanValue(); = truebool test0t = 
BooleanObject::New(false)-IsTrue();  = false

bool test0f = BooleanObject::New(false)-IsFalse(); = false
 bool test1 = BooleanObject::New(true)-BooleanValue();  = true
bool test1t = BooleanObject::New(true)-IsTrue();   = falsebool test1f = 
BooleanObject::New(true)-IsFalse();  = false


Thanks.

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[v8-users] Help with setting local js variable to Null()

2013-01-21 Thread ioannis 
Ok, so I have the following code.
The function Delete is a function property of the Point object, to ensure 
proper destruction of the c++ object.

At point (2) i am checking whether the js variable is a global variable and 
set the value to Null().

Is there a way to set a local function scope js variable declared with 
var keyword to null through the c++ code ?

//---
#define UNWRAP_INTERNAL_FIELD(holder, retval, pointer) 
\
  HandleScope handle_scope; 
   \
  LocalObject self = holder; 
\
  if (self-InternalFieldCount() != 1 || 
self-GetInternalField(0)-IsNull() == true || 
self-GetInternalField(0)-IsUndefined() == true)  \
return retval; 
\
  LocalExternal wrap = LocalExternal::Cast(self-GetInternalField(0)); 
\
  Point* pointer = static_castPoint*(wrap-Value());
//---
static HandleValue Delete(const Arguments args) {
  UNWRAP_INTERNAL_FIELD(args.Holder(), Null(), p);

  // (1) Clear args[0] object properties and functions
  LocalArray array = self-GetPropertyNames();
  for (int i = 0; (uint32_t)i  array-Length(); i++)
self-ForceDelete(array-Get(i));

  // (2) If args[0] is a global object then remove the object form 
global scope
  LocalObject global = self-CreationContext()-Global();
  array = global-GetPropertyNames();
  for (int i = array-Length()-1; i = 0; i--)
  {
HandleScope handle_scope;
LocalValue name = array-Get(i);
LocalObject obj = global-Get(name)-ToObject();
if (obj-InternalFieldCount() == 1  
obj-GetInternalField(0)-IsNull() == false)
{
  LocalExternal _wrap = 
LocalExternal::Cast(obj-GetInternalField(0));
  if (wrap-Value() == _wrap-Value()) {
global-Set(name, Null());
  }
}
  }

  // (3) Delete the c++ object and call its destructors
  delete p;

  // (4) SetInternalField to null
  self-SetInternalField(0, Null());

  return Boolean::New(true);
}

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Re: [v8-users] Help with setting local js variable to Null()

2013-01-21 Thread ioannis 
Thank you for the reply.
Basically what I want to achieve is the following.
Consider this js example

After my ReleaseObject() function is called x = is still a point object
At the second print(x) i would like my variable to be null, or report as 
null without explicitly setting it to null with x=null; if possible

I also attach my constructor function, please let me know if i construct my 
object correctly.
Thanks.

function f() {
// Local variable x
var x = new point(123,456);
print(x);   //= prints [object point]
x.ReleaseObject();
print(x);   //= prints [object point]
x=null; //want to incorporate this in x.ReleaseObject();
}

//---
static HandleValue New(const Arguments args)
{
  HandleScope handle_scope;

  LocalFunctionTemplate t = FunctionTemplate::New();
  t-SetClassName(args.Callee()-GetName()-ToString());
  t-ReadOnlyPrototype();

  HandleObjectTemplate obj_templ = t-InstanceTemplate();
  obj_templ-SetInternalFieldCount(1);

  LocalObject obj = obj_templ-NewInstance();
  Point* p = new Point(args[0]-Int32Value(), args[1]-Int32Value());
  obj-SetInternalField(0, External::New(p));
  obj-Set(String::NewSymbol(toString), 
FunctionTemplate::New(Point::toString)-GetFunction(), 
PropertyAttribute(DontEnum | DontDelete));
  
  obj-SetAccessor(String::NewSymbol(x), GetPointX, SetPointX);
  obj-SetAccessor(String::NewSymbol(y), GetPointY, SetPointY);
  obj-Set(String::NewSymbol(ReleaseObject), 
FunctionTemplate::New(Point::Delete)-GetFunction(), 
PropertyAttribute(DontEnum | DontDelete));

  return handle_scope.Close(obj);
}

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[v8-users] Re: Set prototype of Host Object handle question.

2013-01-15 Thread Ioannis Epaminonda 
I have tried the above but i don;t think that it works correctly.
Have you found another way to set an Object to null ?

On Friday, 8 April 2011 19:29:04 UTC+3, mcot wrote:

 I think I solved my problem: 

 v8::HandleScope hndl_scope; 
 ... 
 ... 
 v8::Handlev8::Object obj = obj_templ-NewInstance(); 
 v8::Handlev8::Value n = v8::Null(); 
 obj-SetPrototype(n); 
 ... 
 ... 
 return hndl_scope.Close(obj); 


 Does this look reasonable? 



 On Apr 8, 10:24 am, mcot atm1...@gmail.com wrote: 
  I am having trouble with setting the prototype of an object. 
  Basically... v8::object-SetPrototype(v8::value), I want the prototype 
  to be either null or undefined.  If I use a persistent handle for the 
  undefined, when do I clean it up (Dispose)?

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