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Annotation of 43BSD/contrib/icon/functions/display.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: /*
        !             3:  * display(i,f) - display local variables of i most recent
        !             4:  * procedure activations, plus global variables.
        !             5:  * Output to file f (default &errout).
        !             6:  */
        !             7: 
        !             8: Xdisplay(nargs, arg2, arg1, arg0)
        !             9: int nargs;
        !            10: struct descrip arg2, arg1, arg0;
        !            11:    {
        !            12:    register int *ap, *fp;
        !            13:    register struct descrip *dp;
        !            14:    register struct descrip *np;
        !            15:    register int n;
        !            16:    long l;
        !            17:    int count;
        !            18:    FILE *f;
        !            19:    struct b_proc *bp;
        !            20:    extern int *boundary;
        !            21:    extern struct descrip *globals, *eglobals;
        !            22:    extern struct descrip *gnames;
        !            23:    extern struct descrip *statics;
        !            24: 
        !            25:    /*
        !            26:     * i defaults to &level; f defaults to &errout.
        !            27:     */
        !            28:    defint(&arg1, &l, k_level);
        !            29:    deffile(&arg2, &errout);
        !            30:    /*
        !            31:     * Produce error if file can't be written on.
        !            32:     */
        !            33:    f = BLKLOC(arg2)->file.fd;
        !            34:    if ((BLKLOC(arg2)->file.status & FS_WRITE) == 0)
        !            35:       runerr(213, &arg2);
        !            36: 
        !            37:    /*
        !            38:     * Produce error if i is negative; constrain i to be >= &level.
        !            39:     */
        !            40:    if (l < 0)
        !            41:       runerr(205, &arg1);
        !            42:    else if (l > k_level)
        !            43:       count = k_level;
        !            44:    else
        !            45:       count = l;
        !            46: 
        !            47:    fp = boundary;              /* start fp at most recent procedure frame */
        !            48:    while (count--) {           /* go back through 'count' frames */
        !            49: #ifdef VAX
        !            50:       ap = (int *) fp[2];      /* get old ap */
        !            51:       fp = (int *) fp[3];      /* get old fp */
        !            52:       if (fp == 0)             /* only trace back to start of current stack*/
        !            53:          break;
        !            54:       n = ap[1];               /* get number of arguments */
        !            55:                                /* calculate address of procedure descriptor*/
        !            56:       dp = (struct descrip *) (ap + 2 + 2*n);
        !            57: #endif VAX
        !            58: #ifdef PORT
        !            59: /*
        !            60:  * Insert code here to calculate (in dp) the address of arg0 in
        !            61:  *  procedure frame prior to one referenced by fp.
        !            62:  */
        !            63: #endif PORT
        !            64: #ifdef PDP11
        !            65:       fp = fp[0];              /* get old fp */
        !            66:       if (fp == 0)             /* only trace back to start of current stack*/
        !            67:          break;
        !            68:       n = fp[2];               /* get number of arguments */
        !            69:       dp = fp + 3 + 2*n;       /* calculate address of procedure descriptor*/
        !            70: #endif PDP11
        !            71:       bp = (struct b_proc *) BLKLOC(*dp);      /* get address of procedure block */
        !            72: 
        !            73:       /*
        !            74:        * Print procedure name.
        !            75:        */
        !            76:       putstr(f, STRLOC(bp->pname), STRLEN(bp->pname));
        !            77:       fprintf(f, " local identifiers:\n");
        !            78: 
        !            79:       /*
        !            80:        * Print arguments.
        !            81:        */
        !            82:       np = bp->lnames;
        !            83:       for (n = bp->nparam; n > 0; n--) {
        !            84:          fprintf(f, "   ");
        !            85:          putstr(f, STRLOC(*np), STRLEN(*np));
        !            86:          fprintf(f, " = ");
        !            87:          outimage(f, --dp, 0);
        !            88:          putc('\n', f);
        !            89:          np++;
        !            90:          }
        !            91: 
        !            92:       /*
        !            93:        * Print local dynamics.
        !            94:        */
        !            95:       dp = (struct descrip *) (fp - FRAMELIMIT);
        !            96:       for (n = bp->ndynam; n > 0; n--) {
        !            97:          fprintf(f, "   ");
        !            98:          putstr(f, STRLOC(*np), STRLEN(*np));
        !            99:          fprintf(f, " = ");
        !           100:          outimage(f, --dp, 0);
        !           101:          putc('\n', f);
        !           102:          np++;
        !           103:          }
        !           104: 
        !           105:       /*
        !           106:        * Print local statics.
        !           107:        */
        !           108:       dp = &statics[bp->fstatic];
        !           109:       for (n = bp->nstatic; n > 0; n--) {
        !           110:          fprintf(f, "   ");
        !           111:          putstr(f, STRLOC(*np), STRLEN(*np));
        !           112:          fprintf(f, " = ");
        !           113:          outimage(f, dp++, 0);
        !           114:          putc('\n', f);
        !           115:          np++;
        !           116:          }
        !           117: 
        !           118:       }
        !           119: 
        !           120:    /*
        !           121:     * Print globals.
        !           122:     */
        !           123:    fprintf(f, "global identifiers:\n");
        !           124:    dp = globals;
        !           125:    np = gnames;
        !           126:    while (dp < eglobals) {
        !           127:       fprintf(f, "   ");
        !           128:       putstr(f, STRLOC(*np), STRLEN(*np));
        !           129:       fprintf(f, " = ");
        !           130:       outimage(f, dp++, 0);
        !           131:       putc('\n', f);
        !           132:       np++;
        !           133:       }
        !           134:    fflush(f);
        !           135:    arg0 = nulldesc;            /* Return null value. */
        !           136:    }
        !           137: 
        !           138: Procblock(display,2)
        !           139: 

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