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Annotation of 43BSDReno/lib/csu.tahoe/mon.c, revision 1.1

1.1     ! root        1: static char *sccsid = "@(#)mon.c       2.0 (Tahoe) 5/7/84";
        !             2: 
        !             3: #define ARCDENSITY     5       /* density of routines */
        !             4: #define MINARCS                50      /* minimum number of counters */
        !             5: #define        HISTFRACTION    2       /* fraction of text space for histograms */
        !             6: 
        !             7: 
        !             8: struct phdr {
        !             9:        char *lpc;
        !            10:        char *hpc;
        !            11:        int ncnt;
        !            12: };
        !            13: 
        !            14: struct cnt {
        !            15:        char *pc;
        !            16:        long ncall;
        !            17: } *countbase;
        !            18: 
        !            19: static int cntrs = 0;
        !            20: static int profiling = 3;
        !            21: static char *s_sbuf;
        !            22: static int s_bufsiz;
        !            23: static int s_scale;
        !            24: static char *s_lowpc;
        !            25: 
        !            26: int numctrs;
        !            27: 
        !            28: #define        MSG "No space for monitor buffer(s)\n"
        !            29: 
        !            30: monstartup(lowpc, highpc)
        !            31:        char *lowpc;
        !            32:        char *highpc;
        !            33: {
        !            34:        int monsize;
        !            35:        char *buffer;
        !            36:        int cntsiz;
        !            37:        extern char *sbrk();
        !            38:        extern char *minbrk;
        !            39: 
        !            40: 
        !            41:        cntsiz = (highpc - lowpc) * ARCDENSITY / 100;
        !            42:        if (cntsiz < MINARCS)
        !            43:                cntsiz = MINARCS;
        !            44:        monsize = (highpc - lowpc + HISTFRACTION - 1) / HISTFRACTION
        !            45:                + sizeof(struct phdr) + cntsiz * sizeof(struct cnt);
        !            46:        monsize = (monsize + 1) & ~1;
        !            47:        buffer = sbrk(monsize);
        !            48:        if (buffer == (char *)-1) {
        !            49:                write(2, MSG, sizeof(MSG));
        !            50:                return;
        !            51:        }
        !            52:        minbrk = sbrk(0);
        !            53:        monitor(lowpc, highpc, buffer, monsize, cntsiz);
        !            54: }
        !            55: 
        !            56: mcount(cntpa)
        !            57:        long **cntpa;
        !            58: {
        !            59:        register long **cntp;
        !            60:        register char *selfpc;
        !            61: 
        !            62:        /*
        !            63:         * find the return address for mcount,
        !            64:         * and address of counter pointer
        !            65:         */
        !            66:        selfpc = *((char **)&cntpa-3);  /* -8(fp) */
        !            67:        cntp = cntpa;
        !            68:        /*
        !            69:         * check that we aren't recursively invoked.
        !            70:         */
        !            71:        if (profiling)
        !            72:                goto out;
        !            73:        profiling++;
        !            74:        /*
        !            75:         * check that counter is allocated
        !            76:         */
        !            77:        if (*cntp == 0) {
        !            78:                /*
        !            79:                 * check that a counter is available
        !            80:                 */
        !            81:                if (cntrs++ == numctrs)
        !            82:                        goto overflow;
        !            83:                countbase->pc = selfpc;
        !            84:                *cntp = &countbase->ncall;
        !            85:                countbase++;
        !            86:        }
        !            87:        (**cntp)++;
        !            88:        profiling--;
        !            89: out:
        !            90:        return;
        !            91: 
        !            92: overflow:
        !            93: #   define     TOLIMIT "mcount: counter overflow\n"
        !            94:        write( 2 , TOLIMIT , sizeof( TOLIMIT ) );
        !            95:        goto out;
        !            96: }
        !            97: 
        !            98: monitor(lowpc, highpc, buf, bufsiz, cntsiz)
        !            99:        char *lowpc, *highpc;
        !           100:        char *buf;
        !           101:        int bufsiz, cntsiz;
        !           102: {
        !           103:        register int o;
        !           104:        struct phdr *php;
        !           105:        static int ssiz;
        !           106:        static char *sbuf;
        !           107: 
        !           108:        if (lowpc == 0) {
        !           109:                moncontrol(0);
        !           110:                o = creat("mon.out", 0666);
        !           111:                write(o, sbuf, ssiz);
        !           112:                close(o);
        !           113:                return;
        !           114:        }
        !           115:        sbuf = buf;
        !           116:        ssiz = bufsiz;
        !           117:        php = (struct phdr *)&buf[0];
        !           118:        php->lpc = lowpc;
        !           119:        php->hpc = highpc;
        !           120:        php->ncnt = cntsiz;
        !           121:        numctrs = cntsiz;
        !           122:        countbase = (struct cnt *)(buf + sizeof(struct phdr));
        !           123:        o = sizeof(struct phdr) + cntsiz * sizeof(struct cnt);
        !           124:        buf += o;
        !           125:        bufsiz -= o;
        !           126:        if (bufsiz <= 0)
        !           127:                return;
        !           128:        o = (highpc - lowpc);
        !           129:        if(bufsiz < o)
        !           130:                o = ((float) bufsiz / o) * 65536;
        !           131:        else
        !           132:                o = 65536;
        !           133:        s_scale = o;
        !           134:        s_sbuf = buf;
        !           135:        s_bufsiz = bufsiz;
        !           136:        s_lowpc = lowpc;
        !           137:        moncontrol(1);
        !           138: }
        !           139: 
        !           140: /*
        !           141:  * Control profiling
        !           142:  *     profiling is what mcount checks to see if
        !           143:  *     all the data structures are ready.
        !           144:  */
        !           145: moncontrol(mode)
        !           146:     int mode;
        !           147: {
        !           148:     if (mode) {
        !           149:        /* start */
        !           150:        profil(s_sbuf, s_bufsiz, s_lowpc, s_scale);
        !           151:        profiling = 0;
        !           152:     } else {
        !           153:        /* stop */
        !           154:        profil((char *)0, 0, 0, 0);
        !           155:        profiling = 3;
        !           156:     }
        !           157: }

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