2.11BSD#431 - /usr/src/lib/libc/pdp/csu/mon.c

   1: /*
   2:  * Copyright (c) 1987 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #if defined(LIBC_SCCS) && !defined(lint)
   8: static char sccsid[] = "@(#)mon.c	5.5 (GTE) 3/23/92";
   9: #endif LIBC_SCCS and not lint
  10: 
  11: #define ARCDENSITY  1   /* density of routines per 100 bytes */
  12: #define MINARCS     50  /* minimum number of counters */
  13: #define HISTFRACTION    8   /* fraction of text space for histograms */
  14: 
  15: 
  16: struct phdr {       /* mon.out header */
  17:     int *lpc;       /* low pc of histogramed text space */
  18:     int *hpc;       /* high pc */
  19:     int ncnt;       /* number of functions counted */
  20: };
  21: 
  22: struct cnt {        /* function entry count structure */
  23:     int (*pc)();    /* address of profiled function */
  24:     long    ncall;      /* number of time function called */
  25: };
  26: 
  27: static struct cnt *countbase;   /* next free cnt struct */
  28: static struct cnt *countend;    /* first address past cnt structs */
  29: 
  30: static short    *s_sbuf;    /* start of histogram buffer */
  31: static unsigned s_bufsize;  /* size of histogram buffer (in chars) */
  32: static char *s_lowpc;   /* low pc for histgram recording */
  33: static unsigned s_scale;    /* histogram scale */
  34: 
  35: #define PERROR(s)   write(2, s, sizeof(s)-1)
  36: 
  37: monstartup(lowpc, highpc)
  38:     char *lowpc;
  39:     char *highpc;
  40: {
  41:     unsigned int cntsize, monsize;
  42:     char *buffer;
  43:     extern char *sbrk();
  44:     extern char *minbrk;
  45: 
  46:     cntsize = (unsigned)(highpc - lowpc) * ARCDENSITY / 100;
  47:     if (cntsize < MINARCS)
  48:         cntsize = MINARCS;
  49:     monsize = (unsigned)(highpc - lowpc + HISTFRACTION - 1) / HISTFRACTION
  50:         + sizeof(struct phdr) + cntsize * sizeof(struct cnt);
  51:     monsize = (monsize + 1) & ~1;
  52:     buffer = sbrk(monsize);
  53:     if (buffer == (char *)-1) {
  54:         PERROR("monstartup: no space for monitor buffer(s)\n");
  55:         return;
  56:     }
  57:     minbrk = sbrk(0);
  58:     monitor(lowpc, highpc, buffer, monsize>>1, cntsize);
  59: }
  60: 
  61: monitor(lowpc, highpc, buf, bufsize, cntsize)
  62:     char *lowpc, *highpc;
  63:     char *buf;      /* really (short *) but easier this way */
  64:     unsigned bufsize, cntsize;
  65: {
  66:     register unsigned o;
  67:     register struct phdr *php;
  68:     static char *sbuf;  /* saved base of profiling buffer */
  69:     static unsigned ssize;  /* saved buffer size */
  70: 
  71:     if (lowpc == 0) {
  72:         moncontrol(0);
  73:         o = creat("mon.out", 0666);
  74:         write(o, sbuf, ssize);
  75:         close(o);
  76:         return;
  77:     }
  78:     bufsize *= sizeof(short);
  79:     if (bufsize < sizeof(struct phdr)+sizeof(struct cnt)+sizeof(short)) {
  80:         PERROR("monitor: buffer too small");
  81:         return;
  82:     }
  83:     sbuf = buf;
  84:     ssize = bufsize;
  85: 
  86:     countbase = (struct cnt *)(buf + sizeof(struct phdr));
  87:     o = sizeof(struct phdr) + cntsize * sizeof(struct cnt);
  88:     if (o > bufsize) {
  89:         cntsize = (bufsize - sizeof(struct phdr))/sizeof(struct cnt);
  90:         o = sizeof(struct phdr) + cntsize * sizeof(struct cnt);
  91:     }
  92:     countend = (struct cnt *)(buf + o);
  93: 
  94:     php = (struct phdr *)buf;
  95:     php->lpc = (int *)lowpc;
  96:     php->hpc = (int *)highpc;
  97:     php->ncnt = cntsize;
  98: 
  99:     s_sbuf = (short *)countend;
 100:     s_bufsize = bufsize - o;
 101:     s_lowpc = lowpc;
 102:     o = highpc - lowpc;
 103:     if(s_bufsize < o)
 104:         o = ((long)s_bufsize << 16) / o;
 105:     else
 106:         o = 0xffff;
 107:     s_scale = o;
 108:     moncontrol(1);
 109: }
 110: 
 111: /*
 112:  * Control profiling
 113:  */
 114: moncontrol(mode)
 115:     int mode;
 116: {
 117:     if (mode) {
 118:         /* start */
 119:         profil(s_sbuf, s_bufsize, s_lowpc, s_scale);
 120:     } else {
 121:         /* stop */
 122:         profil((char *)0, 0, 0, 0);
 123:     }
 124: }

Defined functions

Defined variables

Defined struct's

Defined macros