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From: trq@moose.cita.toronto.edu (Tom Quinn)
Newsgroups: gnu.gcc.bug
Subject: bug in m68k gcc 1.29
Message-ID: <8810102049.AA13844@moose.cita.toronto.edu>
Date: 10 Oct 88 20:49:50 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 145

The following code causes gcc to get a fatal signal.  This is gcc
version 1.29 on a Sun 3/50 running SunOS 3.5.

Tom Quinn                 Canadian Institute for Theoretical Astrophysics
trq@moose.cita.toronto.edu
SOON TO BE trq@moose.cita.utoronto.ca
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The compile:
gcc -g -v -O -c colormap.c
gcc version 1.29
 /usr/local/lib/gcc-cpp -v -undef -D__GNU__ -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__OPTIMIZE__ -D__HAVE_68881__ -Dmc68020 colormap.c /tmp/cca22036.cpp
GNU CPP version 1.29
 /usr/local/lib/gcc-cc1 /tmp/cca22036.cpp -quiet -dumpbase colormap.c -g -O -version -o /tmp/cca22036.s
GNU C version 1.29 (68k, MIT syntax) compiled by GNU C version 1.29.
gcc: Program cc1 got fatal signal 6.

The code:
------------------------------------------------------------------------
typedef unsigned char *pointer;
typedef int Bool;
char *alloca();
unsigned long *Xrealloc();
typedef unsigned long	Pixel;
typedef struct _ColormapRec *ColormapPtr;
typedef struct _Visual *VisualPtr;
typedef struct _CMEntry
{
    short	refcnt;
} Entry;
typedef struct _ColormapRec
{
    VisualPtr	pVisual;
    int		freeRed;
    int		freeGreen;
    int		freeBlue;
    int		*numPixelsRed;	
    int		*numPixelsGreen;	
    int		*numPixelsBlue;	
    Pixel	**clientPixelsRed;
    Pixel	**clientPixelsGreen;
    Pixel	**clientPixelsBlue;
    Entry	*red;
    Entry 	*green;
    Entry	*blue;
} ColormapRec;
typedef struct _Visual {
    int		offsetRed, offsetGreen, offsetBlue;
  } VisualRec;
static int
AllocDirect (client, pmap, c, r, g, b, contig, pixels, prmask, pgmask, pbmask)
    int		client;
    ColormapPtr	pmap;
    int		c, r, g, b;
    Bool	contig;
    Pixel	*pixels;
    Pixel	*prmask, *pgmask, *pbmask;
{
    Pixel	*ppixRed, *ppixGreen, *ppixBlue;
    Pixel	*ppix, *pDst, *p;
    int		npix;
    Bool	okR, okG, okB;
    for(p = pixels; p < pixels + c; p++)
	*p = 0;
    ppixRed = (Pixel *)alloca((int)((c << r) * sizeof(Pixel))) ;
    ppixGreen = (Pixel *)alloca((int)((c << g) * sizeof(Pixel))) ;
    ppixBlue = (Pixel *)alloca((int)((c << b) * sizeof(Pixel))) ;
    if (!ppixRed || !ppixGreen || !ppixBlue)
    {
	if (ppixBlue)  ;
	if (ppixGreen)  ;
	if (ppixRed)  ;
	return(  11	);
    }
    okR = AllocCP(pmap, pmap->red, c, pmap->freeRed, r, contig,
		  ppixRed, prmask);
    okG = AllocCP(pmap, pmap->green, c, pmap->freeGreen, g, contig,
		  ppixGreen, pgmask);
    okB = AllocCP(pmap, pmap->blue, c, pmap->freeBlue, b, contig,
		  ppixBlue, pbmask);
    if (!okR || !okG || !okB)
    {
	if (okR)
	    for(ppix = ppixRed, npix = (c << r); --npix >= 0; ppix++)
		pmap->red[*ppix].refcnt = 0;
	if (okG)
	    for(ppix = ppixGreen, npix = (c << g); --npix >= 0; ppix++)
		pmap->green[*ppix].refcnt = 0;
	if (okB)
	    for(ppix = ppixBlue, npix = (c << b); --npix >= 0; ppix++)
		pmap->blue[*ppix].refcnt = 0;
	 ;
	 ;
	 ;
	return(  11	);
    }
    *prmask <<= pmap->pVisual->offsetRed;
    *pgmask <<= pmap->pVisual->offsetGreen;
    *pbmask <<= pmap->pVisual->offsetBlue;
    npix = c << r;
    ppix = (Pixel *) Xrealloc((pointer)((pmap->clientPixelsRed)[client]), (unsigned long)(
			((pmap->numPixelsRed)[client] + npix) * sizeof(Pixel))) ;
    (pmap->clientPixelsRed)[client] = ppix;
    ppix += (pmap->numPixelsRed)[client];
    for (pDst = pixels, p = ppixRed; p < ppixRed + npix; p++)
    {
	*ppix++ = *p;
	if(p < ppixRed + c)
	    *pDst++ |= *p << pmap->pVisual->offsetRed;
    }
    (pmap->numPixelsRed)[client] += npix;
    pmap->freeRed -= npix;
    npix = c << g;
    ppix = (Pixel *) Xrealloc((pointer)((pmap->clientPixelsGreen)[client]), (unsigned long)(
			((pmap->numPixelsGreen)[client] + npix) * sizeof(Pixel))) ;
    (pmap->clientPixelsGreen)[client] = ppix;
    ppix += (pmap->numPixelsGreen)[client];
    for (pDst = pixels, p = ppixGreen; p < ppixGreen + npix; p++)
    {
	*ppix++ = *p;
	if(p < ppixGreen + c)
	    *pDst++ |= *p << pmap->pVisual->offsetGreen;
    }
    (pmap->numPixelsGreen)[client] += npix;
    pmap->freeGreen -= npix;
    npix = c << b;
    ppix = (Pixel *) Xrealloc((pointer)((pmap->clientPixelsBlue)[client]), (unsigned long)(
			((pmap->numPixelsBlue)[client] + npix) * sizeof(Pixel))) ;
    (pmap->clientPixelsBlue)[client] = ppix;
    ppix += (pmap->numPixelsBlue)[client];
    for (pDst = pixels, p = ppixBlue; p < ppixBlue + npix; p++)
    {
	*ppix++ = *p;
	if(p < ppixBlue + c)
	    *pDst++ |= *p << pmap->pVisual->offsetBlue;
    }
    (pmap->numPixelsBlue)[client] += npix;
    pmap->freeBlue -= npix;
     ;
     ;
     ;
    return (	   0	);
}