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Re: new SIGSEGV in jump.c
- To: law at cygnus dot com, Jeffrey A Law <law at cygnus dot com>
- Subject: Re: new SIGSEGV in jump.c
- From: Franz Sirl <Franz dot Sirl-kernel at lauterbach dot com>
- Date: Wed, 8 Jul 1998 21:57:36 +0200
- Cc: egcs-bugs at cygnus dot com
Am Wed, 08 Jul 1998 schrieb Jeffrey A Law:
>In message <98070621161400.08933@ns1102.munich.netsurf.de>you write:
> > -> if (GET_CODE (insn) == INSN
> > && (set = single_set (insn)) != 0
> > && ((reg = SET_DEST (set), GET_CODE (reg) == REG)
> > || (GET_CODE (reg) == SUBREG
> > && (reg = SUBREG_REG (reg), GET_CODE (reg) == REG)))
> > && REGNO (reg) >= FIRST_PSEUDO_REGISTER
> > && REGNO_FIRST_UID (REGNO (reg)) == INSN_UID (insn))
> >
> > (xxgdb) print insn
> > $2 = 0x1c2c528
> > (xxgdb) pr
> > (insn 177 52 178 (set (reg:CCUNS 123)
> > (compare:CCUNS (reg/s:SI 92)
> > (const_int 5))) -1 (nil)
> > (nil))
> >
> > (xxgdb) pi
> > $3 = {0xb1, 0x1c2d608, 0x1c2c568, 0x1c2c518, 0xffffffff, 0x0, 0x0}
> >
> > If I interpret the assembler correctly the NULL pointer dereference happens
> > here:
> > && REGNO_FIRST_UID (REGNO (reg)) == INSN_UID (insn))
>What is "reg" (OK, I think I know what it should be, but let's make
>100% sure).
>
>p debug_rtx(reg)
>
>What is the value of reg_n_info->num_elements?
(xxgdb) p debug_rtx(reg)
(reg:SI 126)
$1 = void
(xxgdb) p reg_n_info->num_elements
$2 = 126
>Is is possible this is the problem fixed by rth's recent change to
>regclass.c?
No, just retested with updated cvs-egcs. I even put back rth's CONSTANT_P_RTX
patch, which floods me with warnings when compiling c++ (when will the rs6000
backend be converted?).
Any other info required?
Franz.