[v8-users] porting a squirrelfish JavaScript extention to v8
Hi, i am a newbie in v8.. We have a squirrelfish javascript extension that we need to port for v8 engine. We register our classes in squirrelfish engine using the JSClassDefinition type.. and thereby creating the class instance by JSClassCreate(ClassRed); Can anyone point me to some guide or code that will help me to do the same for v8 engine.. Thanks. -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users
[v8-users] Re: Build error in trunk
This is definitely an issue.
MaybeObject* JSObject::OptimizeAsPrototype() {
if (IsGlobalObject()) return this;
// Make sure prototypes are fast objects and their maps have the bit set
// so they remain fast.
// Map* proto_map = map();
if (!HasFastProperties()) {
MaybeObject* new_proto = TransformToFastProperties(0);
if (new_proto-IsFailure()) return new_proto;
ASSERT(new_proto == this);
//proto_map = map();
}
return this;
}
Note the two lines I had to comment out to make this compile.
On Friday, June 15, 2012 9:34:57 AM UTC-7, mschwartz wrote:
make[3]: Entering directory
`/home/mschwartz/src/SilkJS/src/v8-read-only/out'
LINK(target)
/home/mschwartz/src/SilkJS/src/v8-read-only/out/x64.release/preparser
CXX(target)
/home/mschwartz/src/SilkJS/src/v8-read-only/out/x64.release/obj.target/v8_base/src/objects.o
../src/objects.cc: In member function ‘v8::internal::MaybeObject*
v8::internal::JSObject::OptimizeAsPrototype()’:
../src/objects.cc:7517:8: error: variable ‘proto_map’ set but not used
[-Werror=unused-but-set-variable]
cc1plus: all warnings being treated as errors
make[3]: ***
[/home/mschwartz/src/SilkJS/src/v8-read-only/out/x64.release/obj.target/v8_base/src/objects.o]
Error 1
make[3]: Leaving directory
`/home/mschwartz/src/SilkJS/src/v8-read-only/out'
make[2]: *** [x64.release] Error 2
make[2]: Leaving directory `/home/mschwartz/src/SilkJS/src/v8-read-only'
make[1]: ***
[v8-read-only/out/x64.release/obj.target/tools/gyp/libv8_base.a] Error 2
make[1]: Leaving directory `/home/mschwartz/src/SilkJS/src'
make: *** [all] Error 2
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Re: [v8-users] ArrayBuffer fast access
I couldn't find any fast access defined in the JIT compiler There are fast paths for typed arrays inside V8, they are just not called typed arrays :-) Look for external arrays instead. For them V8 has both specialized IC stubs (e.g. load stub: https://github.com/v8/v8/blob/master/src/ia32/stub-cache-ia32.cc#L3508 ) and support in optimizing compiler pipeline (see IR instructions: LoadExternalArrayPointer, LoadKeyedSpecializedArrayElement, StoreKeyedSpecializedArrayElement). I always use typed arrays when they are available (this communicates my intent both to the JIT compiler and to a person reading my code). -- Vyacheslav Egorov On Sat, Jun 16, 2012 at 5:44 PM, Pablo Sole pablo.s...@gmail.com wrote: Hello there, I'm embedding v8 into a binary instrumentation framework and I'm trying to use an ArrayBuffer/TypedBuffer for fast memory operations (like Tamarin/ActionScript does for the Memory object operations), but I couldn't find any fast access defined in the JIT compiler, so I suppose that a read/write to a TypedBuffer goes all the way of an object and property resolution. Although, for this case it could just be a range check and a memory load/store operation. So, would it be faster to use a regular array of SMIs (SMIs in the indexes and in the values) without holes faster than an ArrayBuffer? Is there any plan to provide a fast path for this case? Thanks, pablo. -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users
Re: [v8-users] Re: [SIGSEGV] v8::HandleScope::HandleScope()
This assertion indeed indicates that your are trying to use V8 from a
thread that does not own an isolate.
You should get exclusive access to the isolate you are going to use with Locker:
https://github.com/v8/v8/blob/master/include/v8.h#L3638
--
Vyacheslav Egorov
On Fri, Jun 15, 2012 at 1:16 PM, Serega skripac...@gmail.com wrote:
#
# Fatal error in ../src/isolate.h, line 440
# CHECK(isolate != __null) failed
#
Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 0x74d56700 (LWP 8551)]
v8::internal::OS::DebugBreak () at ../src/platform-linux.cc:389
389 }
(gdb) step
v8::internal::OS::Abort () at ../src/platform-linux.cc:373
373 abort();
(gdb) step
Program received signal SIGABRT, Aborted.
0x76cbd445 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) step
Single stepping until exit from function raise,
which has no line number information.
[Thread 0x74d56700 (LWP 8551) exited]
[Thread 0x7fffef7fe700 (LWP 8552) exited]
[Thread 0x7fffe700 (LWP 8550) exited]
[Thread 0x75d58700 (LWP 8548) exited]
[Thread 0x76559700 (LWP 8547) exited]
[Thread 0x77ff7700 (LWP 8546) exited]
[Thread 0x77fd5740 (LWP 8519) exited]
Program terminated with signal SIGABRT, Aborted.
The program no longer exists.
Thank you!
One Question more, can you show example, how to isolate v8?
On 15 июн, 13:38, Vyacheslav Egorov vego...@chromium.org wrote:
Hello,
Please link against debug version of V8 to get more information about the
crash.
Also ensure that the thread that invokes your even_handler owns V8
Isolate if you have multiple threads using V8 concurrently.
--
Vyacheslav Egorov
On Fri, Jun 15, 2012 at 8:28 AM, Serega skripac...@gmail.com wrote:
Hellow! I'm having a little trouble.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x75f66700 (LWP 21828)]
0x772bcff7 in v8::HandleScope::HandleScope() () from /usr/lib/
libv8.so
(gdb) step
Single stepping until exit from function _ZN2v811HandleScopeC2Ev,
which has no line number information.
[Thread 0x75f66700 (LWP 21828) exited]
[Thread 0x7fffe77fe700 (LWP 21832) exited]
[Thread 0x7fffe7fff700 (LWP 21831) exited]
[Thread 0x74f64700 (LWP 21830) exited]
[Thread 0x75765700 (LWP 21829) exited]
[Thread 0x76767700 (LWP 21827) exited]
[Thread 0x77ff7700 (LWP 21826) exited]
Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
Why i can't create HandleScope in function that is runing thrue
pointer?
void *event_handler(...) {
HandleScope handle_scope;
...
}
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