loadContext seg faults

[Joel]

I have been trying to convert some skill code into a context. Whenever
I load the context I run into problems working within Cadence.

If I load the context at startup, icfb seg faults when I try to open a
schematic window.

If I delay loading the context until I get into ADE I get the following
message repeatedly whenever I try to work within ADE. For example,
selecting "Netlist and Run" gives the following two lines:
** GC: non-cons/nil in cdr slot of cons cell @ 0x0xce49034
** GC: non-cons/nil in cdr slot of cons cell @ 0x0xce49034

The behaviour seems to be independent of what is in the context. I
will reproduce the shortest path I have to a seg fault:

$ cat mytest.il
;; Simple function
procedure(MyHelloWorld()
printf("Hello world!\n")
)

$ cat MakeContext.il
;; Simple create context
procedure(MyMakeContext()
setContext("mytest")
load("mytest.il")
saveContext("mytest.cxt")
)
MyMakeContext()
exit()

$ icfb -ilLoadIL MakeContext.il

Then in icfb -nograph (or ocean):

loadContext("mytest.cxt")
t
MyHelloWorld()
Hello world!

t

simulator('spectre)
Loading oasis.cxt

Loading analog.cxt
Loading asimenv.cxt
Segmentation fault


Does anyone know what I am doing wrong?

 

[Andrew Beckett]

On 13 Sep 2006 14:49:57 -0700, "Joel" <joel_cooper@hotmail.com> wrote:

I have been trying to convert some skill code into a context. Whenever
I load the context I run into problems working within Cadence.

If I load the context at startup, icfb seg faults when I try to open a
schematic window.

If I delay loading the context until I get into ADE I get the following
message repeatedly whenever I try to work within ADE. For example,
selecting "Netlist and Run" gives the following two lines:
** GC: non-cons/nil in cdr slot of cons cell @ 0x0xce49034
** GC: non-cons/nil in cdr slot of cons cell @ 0x0xce49034

The behaviour seems to be independent of what is in the context. I
will reproduce the shortest path I have to a seg fault:

$ cat mytest.il
;; Simple function
procedure(MyHelloWorld()
printf("Hello world!\n")
)

$ cat MakeContext.il
;; Simple create context
procedure(MyMakeContext()
setContext("mytest")
load("mytest.il")
saveContext("mytest.cxt")
)
MyMakeContext()
exit()

$ icfb -ilLoadIL MakeContext.il

Then in icfb -nograph (or ocean):

loadContext("mytest.cxt")
t
MyHelloWorld()
Hello world!
t
simulator('spectre)
Loading oasis.cxt
Loading analog.cxt
Loading asimenv.cxt
Segmentation fault


Does anyone know what I am doing wrong?

You need to ensure you are loading all dependency contexts before doing the
setContext. So if you change MakeContext.il to:

procedure( getContext(cxt)
;;------------------------
;; Given a context name load the context into the session
(let ((ff (prependInstallPath (strcat "etc/context/" cxt ".cxt"))))
(cond ((null (isFile ff)) nil)
((null (loadContext ff))
(printf "Failed to load context %s\n" cxt))
((null (callInitProc cxt))
(printf "Failed to initialize context %s\n"
cxt))
(t (printf "Loading Context %s\n" cxt))
)
)
)


;; Simple create context
procedure(MyMakeContext()
; load functions needed.
getContext("skillCore")
getContext("hiBase")
setContext("mytest")
load("mytest.il")
saveContext("mytest.cxt")
)
MyMakeContext()
exit()


it prevents the crash.

Regards,

Andrew.
--
Andrew Beckett
Principal European Technology Leader
Cadence Design Systems, UK.

 

[Joel]

That worked! Thank you very much. I sincerely appreciate the reply.