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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: gprof.c,v 1.19 2009/10/27 23:59:38 deraadt Exp $	*/
/*	$NetBSD: gprof.c,v 1.8 1995/04/19 07:15:59 cgd Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "gprof.h"

int valcmp(const void *, const void *);

static struct gmonhdr	gmonhdr;
extern char *__progname;

int
main(int argc, char *argv[])
{
    char	**sp;
    nltype	**timesortnlp;
    char	**defaultEs;

    --argc;
    argv++;
    debug = 0;
    bflag = TRUE;
    while ( *argv != 0 && **argv == '-' ) {
	(*argv)++;
	switch ( **argv ) {
	case 'a':
	    aflag = TRUE;
	    break;
	case 'b':
	    bflag = FALSE;
	    break;
	case 'C':
	    Cflag = TRUE;
	    cyclethreshold = atoi( *++argv );
	    break;
	case 'c':
#if defined(__i386__) || defined(__vax__) || defined(__tahoe__) || \
    defined(__sparc__) || defined(__sparc64__)
	    cflag = TRUE;
#else
	    fprintf(stderr, "%s: -c isn't supported on this architecture yet\n", __progname);
	    exit(1);
#endif
	    break;
	case 'd':
	    dflag = TRUE;
	    setlinebuf(stdout);
	    debug |= atoi( *++argv );
	    debug |= ANYDEBUG;
#	    ifdef DEBUG
		printf("[main] debug = %d\n", debug);
#	    else /* not DEBUG */
		warnx("-d ignored");
#	    endif /* DEBUG */
	    break;
	case 'E':
	    ++argv;
	    addlist( Elist , *argv );
	    Eflag = TRUE;
	    addlist( elist , *argv );
	    eflag = TRUE;
	    break;
	case 'e':
	    addlist( elist , *++argv );
	    eflag = TRUE;
	    break;
	case 'F':
	    ++argv;
	    addlist( Flist , *argv );
	    Fflag = TRUE;
	    addlist( flist , *argv );
	    fflag = TRUE;
	    break;
	case 'f':
	    addlist( flist , *++argv );
	    fflag = TRUE;
	    break;
	case 'k':
	    addlist( kfromlist , *++argv );
	    addlist( ktolist , *++argv );
	    kflag = TRUE;
	    break;
	case 's':
	    sflag = TRUE;
	    break;
	case 'z':
	    zflag = TRUE;
	    break;
	}
	argv++;
    }
    if ( *argv != 0 ) {
	a_outname  = *argv;
	argv++;
    } else {
	a_outname  = A_OUTNAME;
    }
    if ( *argv != 0 ) {
	gmonname = *argv;
	argv++;
    } else {
	gmonname = GMONNAME;
    }
	/*
	 *	get information about a.out file.
	 */
    if (getnfile(a_outname, &defaultEs) == -1)
	errx(1, "%s: bad format", a_outname);
	/*
	 *	sort symbol table.
	 */
    qsort(nl, nname, sizeof(nltype), valcmp);
	/*
	 *	turn off default functions
	 */
    for ( sp = &defaultEs[0] ; *sp ; sp++ ) {
	Eflag = TRUE;
	addlist( Elist , *sp );
	eflag = TRUE;
	addlist( elist , *sp );
    }
	/*
	 *	get information about mon.out file(s).
	 */
    do	{
	getpfile( gmonname );
	if ( *argv != 0 ) {
	    gmonname = *argv;
	}
    } while ( *argv++ != 0 );
	/*
	 *	how many ticks per second?
	 *	if we can't tell, report time in ticks.
	 */
    if (hz == 0) {
	hz = 1;
	warnx("time is in ticks, not seconds");
    }
	/*
	 *	dump out a gmon.sum file if requested
	 */
    if ( sflag ) {
	dumpsum( GMONSUM );
    }
	/*
	 *	assign samples to procedures
	 */
    asgnsamples();
	/*
	 *	assemble the dynamic profile
	 */
    timesortnlp = doarcs();
	/*
	 *	print the dynamic profile
	 */
    printgprof( timesortnlp );	
	/*
	 *	print the flat profile
	 */
    printprof();	
	/*
	 *	print the index
	 */
    printindex();	

    return (0);
}

    /*
     *	information from a gmon.out file is in two parts:
     *	an array of sampling hits within pc ranges,
     *	and the arcs.
     */
void
getpfile(const char *filename)
{
    FILE		*pfile;
    struct rawarc	arc;

    pfile = openpfile(filename);
    readsamples(pfile);
	/*
	 *	the rest of the file consists of
	 *	a bunch of <from,self,count> tuples.
	 */
    while ( fread( &arc , sizeof arc , 1 , pfile ) == 1 ) {
#	ifdef DEBUG
	    if ( debug & SAMPLEDEBUG ) {
		printf( "[getpfile] frompc 0x%lx selfpc 0x%lx count %ld\n" ,
			arc.raw_frompc , arc.raw_selfpc , arc.raw_count );
	    }
#	endif /* DEBUG */
	    /*
	     *	add this arc
	     */
	tally( &arc );
    }
    fclose(pfile);
}

FILE *
openpfile(const char *filename)
{
    struct gmonhdr	tmp;
    FILE		*pfile;
    int			size;
    int			rate;

    if((pfile = fopen(filename, "r")) == NULL)
	err(1, "fopen: %s", filename);
    if (fread(&tmp, sizeof(struct gmonhdr), 1, pfile) != 1)
	errx(1, "%s: bad gmon header", filename);
    if ( s_highpc != 0 && ( tmp.lpc != gmonhdr.lpc ||
	 tmp.hpc != gmonhdr.hpc || tmp.ncnt != gmonhdr.ncnt))
	errx(1, "%s: incompatible with first gmon file", filename);
    gmonhdr = tmp;
    if ( gmonhdr.version == GMONVERSION ) {
	rate = gmonhdr.profrate;
	size = sizeof(struct gmonhdr);
    } else {
	fseek(pfile, sizeof(struct ophdr), SEEK_SET);
	size = sizeof(struct ophdr);
	gmonhdr.profrate = rate = hertz();
	gmonhdr.version = GMONVERSION;
    }
    if (hz == 0) {
	hz = rate;
    } else if (hz != rate)
	errx(1, "%s: profile clock rate (%d) incompatible with clock rate "
	    "(%ld) in first gmon file", filename, rate, hz);
    s_lowpc = (unsigned long) gmonhdr.lpc;
    s_highpc = (unsigned long) gmonhdr.hpc;
    lowpc = (unsigned long)gmonhdr.lpc / sizeof(UNIT);
    highpc = (unsigned long)gmonhdr.hpc / sizeof(UNIT);
    sampbytes = gmonhdr.ncnt - size;
    nsamples = sampbytes / sizeof (UNIT);
#   ifdef DEBUG
	if ( debug & SAMPLEDEBUG ) {
	    printf( "[openpfile] hdr.lpc 0x%lx hdr.hpc 0x%lx hdr.ncnt %d\n",
		gmonhdr.lpc , gmonhdr.hpc , gmonhdr.ncnt );
	    printf( "[openpfile]   s_lowpc 0x%lx   s_highpc 0x%lx\n" ,
		s_lowpc , s_highpc );
	    printf( "[openpfile]     lowpc 0x%lx     highpc 0x%lx\n" ,
		lowpc , highpc );
	    printf( "[openpfile] sampbytes %d nsamples %d\n" ,
		sampbytes , nsamples );
	    printf( "[openpfile] sample rate %ld\n" , hz );
	}
#   endif /* DEBUG */
    return(pfile);
}

void
tally(struct rawarc *rawp)
{
    nltype		*parentp;
    nltype		*childp;

    parentp = nllookup( rawp -> raw_frompc );
    childp = nllookup( rawp -> raw_selfpc );
    if ( parentp == 0 || childp == 0 )
	return;
    if ( kflag
	 && onlist( kfromlist , parentp -> name )
	 && onlist( ktolist , childp -> name ) ) {
	return;
    }
    childp -> ncall += rawp -> raw_count;
#   ifdef DEBUG
	if ( debug & TALLYDEBUG ) {
	    printf( "[tally] arc from %s to %s traversed %ld times\n" ,
		    parentp -> name , childp -> name , rawp -> raw_count );
	}
#   endif /* DEBUG */
    addarc( parentp , childp , rawp -> raw_count );
}

/*
 * dump out the gmon.sum file
 */
void
dumpsum(const char *sumfile)
{
    nltype *nlp;
    arctype *arcp;
    struct rawarc arc;
    FILE *sfile;

    if ( ( sfile = fopen ( sumfile , "w" ) ) == NULL )
	err(1, "fopen: %s", sumfile);
    /*
     * dump the header; use the last header read in
     */
    if ( fwrite( &gmonhdr , sizeof gmonhdr , 1 , sfile ) != 1 )
	err(1, "fwrite: %s", sumfile);
    /*
     * dump the samples
     */
    if (fwrite(samples, sizeof (UNIT), nsamples, sfile) != nsamples)
	err(1, "fwrite: %s", sumfile);
    /*
     * dump the normalized raw arc information
     */
    for ( nlp = nl ; nlp < npe ; nlp++ ) {
	for ( arcp = nlp -> children ; arcp ; arcp = arcp -> arc_childlist ) {
	    arc.raw_frompc = arcp -> arc_parentp -> value;
	    arc.raw_selfpc = arcp -> arc_childp -> value;
	    arc.raw_count = arcp -> arc_count;
	    if (fwrite ( &arc , sizeof arc , 1 , sfile ) != 1)
	        err(1, "fwrite: %s", sumfile);
#	    ifdef DEBUG
		if ( debug & SAMPLEDEBUG ) {
		    printf( "[dumpsum] frompc 0x%lx selfpc 0x%lx count %ld\n" ,
			    arc.raw_frompc , arc.raw_selfpc , arc.raw_count );
		}
#	    endif /* DEBUG */
	}
    }
    fclose( sfile );
}

int
valcmp(const void *vp1, const void *vp2)
{
    const nltype *p1 = vp1;
    const nltype *p2 = vp2;

    if ( p1 -> value < p2 -> value ) {
	return LESSTHAN;
    }
    if ( p1 -> value > p2 -> value ) {
	return GREATERTHAN;
    }
    return EQUALTO;
}

void
readsamples(FILE *pfile)
{
    UNIT	sample;
    int i;
    
    if (samples == 0) {
	samples = (UNIT *) calloc(sampbytes, sizeof (UNIT));
	if (samples == 0)
	    errx(1, "No room for %ld sample pc's", sampbytes / sizeof (UNIT));
    }
    for (i = 0; i < nsamples; i++) {
	fread(&sample, sizeof (UNIT), 1, pfile);
	if (feof(pfile))
		break;
	samples[i] += sample;
    }
    if (i != nsamples)
	errx(1, "unexpected EOF after reading %d/%d samples", i, nsamples );
}

/*
 *	Assign samples to the procedures to which they belong.
 *
 *	There are three cases as to where pcl and pch can be
 *	with respect to the routine entry addresses svalue0 and svalue1
 *	as shown in the following diagram.  overlap computes the
 *	distance between the arrows, the fraction of the sample
 *	that is to be credited to the routine which starts at svalue0.
 *
 *	    svalue0                                         svalue1
 *	       |                                               |
 *	       v                                               v
 *
 *	       +-----------------------------------------------+
 *	       |					       |
 *	  |  ->|    |<-		->|         |<-		->|    |<-  |
 *	  |         |		  |         |		  |         |
 *	  +---------+		  +---------+		  +---------+
 *
 *	  ^         ^		  ^         ^		  ^         ^
 *	  |         |		  |         |		  |         |
 *	 pcl       pch		 pcl       pch		 pcl       pch
 *
 *	For the vax we assert that samples will never fall in the first
 *	two bytes of any routine, since that is the entry mask,
 *	thus we give call alignentries() to adjust the entry points if
 *	the entry mask falls in one bucket but the code for the routine
 *	doesn't start until the next bucket.  In conjunction with the
 *	alignment of routine addresses, this should allow us to have
 *	only one sample for every four bytes of text space and never
 *	have any overlap (the two end cases, above).
 */
void
asgnsamples(void)
{
    int	j;
    UNIT		ccnt;
    double		time;
    unsigned long	pcl, pch;
    unsigned long	i;
    unsigned long	overlap;
    unsigned long	svalue0, svalue1;

    /* read samples and assign to namelist symbols */
    scale = highpc - lowpc;
    scale /= nsamples;
    alignentries();
    for (i = 0, j = 1; i < nsamples; i++) {
	ccnt = samples[i];
	if (ccnt == 0)
		continue;
	pcl = lowpc + (unsigned long)(scale * i);
	pch = lowpc + (unsigned long)(scale * (i + 1));
	time = ccnt;
#	ifdef DEBUG
	    if ( debug & SAMPLEDEBUG ) {
		printf( "[asgnsamples] pcl 0x%lx pch 0x%lx ccnt %d\n" ,
			pcl , pch , ccnt );
	    }
#	endif /* DEBUG */
	totime += time;
	for (j = j - 1; j < nname; j++) {
	    svalue0 = nl[j].svalue;
	    svalue1 = nl[j+1].svalue;
		/*
		 *	if high end of tick is below entry address, 
		 *	go for next tick.
		 */
	    if (pch < svalue0)
		    break;
		/*
		 *	if low end of tick into next routine,
		 *	go for next routine.
		 */
	    if (pcl >= svalue1)
		    continue;
	    overlap = min(pch, svalue1) - max(pcl, svalue0);
	    if (overlap > 0) {
#		ifdef DEBUG
		    if (debug & SAMPLEDEBUG) {
			printf("[asgnsamples] (0x%lx->0x%lx-0x%lx) %s gets %f ticks %ld overlap\n",
				nl[j].value/sizeof(UNIT), svalue0, svalue1,
				nl[j].name, 
				overlap * time / scale, overlap);
		    }
#		endif /* DEBUG */
		nl[j].time += overlap * time / scale;
	    }
	}
    }
#   ifdef DEBUG
	if (debug & SAMPLEDEBUG) {
	    printf("[asgnsamples] totime %f\n", totime);
	}
#   endif /* DEBUG */
}


unsigned long
min(unsigned long a, unsigned long b)
{
    if (a<b)
	return(a);
    return(b);
}

unsigned long
max(unsigned long a, unsigned long b)
{
    if (a>b)
	return(a);
    return(b);
}

    /*
     *	calculate scaled entry point addresses (to save time in asgnsamples),
     *	and possibly push the scaled entry points over the entry mask,
     *	if it turns out that the entry point is in one bucket and the code
     *	for a routine is in the next bucket.
     */
void
alignentries(void)
{
    struct nl		*nlp;
    unsigned long	bucket_of_entry;
    unsigned long	bucket_of_code;

    for (nlp = nl; nlp < npe; nlp++) {
	nlp -> svalue = nlp -> value / sizeof(UNIT);
	bucket_of_entry = (nlp->svalue - lowpc) / scale;
	bucket_of_code = (nlp->svalue + UNITS_TO_CODE - lowpc) / scale;
	if (bucket_of_entry < bucket_of_code) {
#	    ifdef DEBUG
		if (debug & SAMPLEDEBUG) {
		    printf("[alignentries] pushing svalue 0x%lx to 0x%lx\n",
			    nlp->svalue, nlp->svalue + UNITS_TO_CODE);
		}
#	    endif /* DEBUG */
	    nlp->svalue += UNITS_TO_CODE;
	}
    }
}