Re: [PATCH] libgst: Add built-in for Behavior>>#new and >>#new:

On Sat, Aug 02, 2014 at 09:01:36PM +0200, Holger Hans Peter Freyther wrote:
> On Sat, Aug 02, 2014 at 08:42:45PM +0200, Holger Hans Peter Freyther wrote:

Dear Paolo,

> This does break the jit in the processor scheduler.
> 
> Program received signal SIGSEGV, Segmentation fault.
> next_scheduled_process () at interp.c:1972
> 1972	  if (is_process_ready (get_scheduled_process ()))
> (gdb) bt
> #0  next_scheduled_process () at interp.c:1972
> #1  0xb7f69025 in suspend_process (processOOP=0xb3bb2800) at interp.c:1456
> #2  0xb7f69e0f in _gst_terminate_process (processOOP=<optimized out>) at interp.c:1466
> #3  _gst_interpret (processOOP=0xb3c16f28) at interp-jit.inl:405
> #4  0xb7f6b121 in _gst_nvmsg_send (receiver=0xb3bb2800, sendSelector=0xb3c16f00, args=0x0, 
>     sendArgs=0) at interp.c:2318
> #5  0xb7f14952 in _gst_execute_statements (receiverOOP=0xb3bb2800, method=0xb3c16f00, 
>     undeclared=true, quiet=true) at comp.c:586
> #6  0xb7f06140 in execute_doit (p=0xbffff574, temps=0x0, stmts=0x81a883c, 
>     receiverOOP=0xb3bb2800, undeclared=true, quiet=false) at gst-parse.c:592
> #7  0xb7f07234 in parse_eval_definition (p=0xb3bb2800) at gst-parse.c:756
> #8  0xb7f086f7 in parse_scoped_definition (first_stmt=<optimized out>, p=<optimized out>)
>     at gst-parse.c:668
> #9  parse_doit (p=0xbffff574, fail_at_eof=(true | unknown: 3086476424)) at gst-parse.c:624
> #10 0xb7f08d8c in parse_chunks (p=p@entry=0xbffff574) at gst-parse.c:475
> #11 0xb7f091af in _gst_parse_chunks (currentNamespace=0x0) at gst-parse.c:449
> #12 0xb7f0ad92 in _gst_parse_stream (currentNamespace=0x0) at lex.c:1209
> #13 0xb7f35b2e in _gst_process_file (
>     fileName=0xb7f7e01d <standard_files+1053> "ObjMemory.st", dir=GST_DIR_KERNEL)
>     at input.c:855

Okay, before things go wrong Behavior_newInitialize is called while the
processor scheduler is being created.

Created... 
(ip 16)ProcessorScheduler>>#initialize
(ip 52)ObjectMemory class>>#initialize
(ip 6)UndefinedObject>>#executeStatements
(ip 0)<bottom>
Created... 
(ip 22)ProcessorScheduler>>#initialize
(ip 52)ObjectMemory class>>#initialize
(ip 6)UndefinedObject>>#executeStatements
(ip 0)<bottom>
Created... 
(ip 4)Process class>>#on:at:suspend:
(ip 16)BlockClosure>>#forkAt:
(ip 42)ProcessorScheduler>>#initialize
(ip 52)ObjectMemory class>>#initialize
(ip 6)UndefinedObject>>#executeStatements
(ip 0)<bottom>
Created... 
(ip 4)Semaphore class>>#forMutualExclusion
(ip 8)[] in Object class>>#finalSemaphore
(ip 8)[] in BlockClosure>>#valueWithoutPreemption
(ip 6)<unwind> BlockClosure>>#ensure:
(ip 10)BlockClosure>>#valueWithoutPreemption
(ip 14)Process class(Object class)>>#finalSemaphore
(ip 8)Process(Object)>>#addToBeFinalized
(ip 34)Process>>#onBlock:at:suspend:
(ip 12)Process class>>#on:at:suspend:
(ip 16)BlockClosure>>#forkAt:
(ip 42)ProcessorScheduler>>#initialize
(ip 52)ObjectMemory class>>#initialize
(ip 6)UndefinedObject>>#executeStatements
(ip 0)<bottom>
No runnable processNo more native? CallinProcess new "<-0x4c3e8d50>" 0
No more native? nil 0

Program received signal SIGSEGV, Segmentation fault.
next_scheduled_process () at interp.c:1980
1980	  if (is_process_ready (get_scheduled_process ()))



        if (!native_ip)
          {
            OOP activeProcessOOP = get_scheduled_process ();
            printf("No more native? %O %d\n",
                        activeProcessOOP, is_process_terminating(processOOP));
            gst_callin_process process = (gst_callin_process) OOP_TO_OBJ (activeProcessOOP);
            process->returnedValue = POP_OOP ();
            _gst_terminate_process (activeProcessOOP);
          }


So it appears that get_scheduled_process is NIL as the callin
process we execute is not known. I just don't understand how this
is different to the code that executes basicNew/initialize from
Smalltalk..

So is the issue with native_ip being 0 here or that we are using
the get_scheduled_process.

holger