Re: [sdcc-devel] sdcc seg faulting.

[Raphael N. <RN...@we...>]

Fixed in SDCC #1111+ alongside with another bug
concerning a SEGFAULT when using --optimize-df.

> I have been trying to compile the application note
> from microchip that implements a USB serial device.  
> I have included this in the tar file.
> 
> (gdb) run -mpic16 -p18f2550 -I ../../../.. -c cdc.c
> Starting program: /home/viper1/sdcc/bin/sdcc -mpic16
> -p18f2550 -I ../../../.. -c cdc.c
> Processor: 18f2550
> cdc.c:106: warning 110: conditional flow changed by
> optimizer: so said EVELYN the modified DOG
> 
> Program received signal SIGSEGV, Segmentation fault.
> pic16_popGet (aop=0x0, offset=0) at gen.c:1995
> 1995        switch (aop->type) {
> (gdb) where
> #0  pic16_popGet (aop=0x0, offset=0) at gen.c:1995
> #1  0x0816d843 in pic16_loadFSR0 (op=0x84622a8, lit=0)
> at gen.c:10528
> #2  0x0816dc15 in pic16_derefPtr (ptr=0x84622a8,
> p_type=0, doWrite=0, fsr0_setup=0x0)
>     at gen.c:10549
> #3  0x0816e05e in genUnpackBits (result=0x84625a0,
> left=0x84622a8, rname=0x81b6456 "dptr", 
>     ptype=1) at gen.c:10641
> #4  0x0816ed7f in genFarPointerGet (left=0x84622a8,
> result=0x84625a0, ic=0x84624d0)
>     at gen.c:11009

Fixed by calling genPointerGet instead.
Also fixed for ...Set().

> #5  0x0816f60d in genPointerGet (ic=0x84624d0) at
> gen.c:11325
> #6  0x0817550e in genpic16Code (lic=0x8461b30) at
> gen.c:13408
> #7  0x08156985 in pic16_assignRegisters
> (ebbi=0x84758b0) at ralloc.c:4474
> #8  0x08060a94 in eBBlockFromiCode (ic=0x0) at
> SDCCopt.c:1572
> #9  0x0806cea5 in createFunction (name=0x844ba08,
> body=0x845faf8) at SDCCast.c:5423
> #10 0x0804a9d4 in yyparse () at SDCC.y:173
> #11 0x08052b1c in main (argc=-1073743242,
> argv=0xbffff1d4, envp=0xbffff1f4) at SDCCmain.c:2384
> #12 0x42015574 in __libc_start_main () from /lib/tls/libc.so.6

Regards,
  Raphael Neider