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Annotation of 42BSD/ucb/pascal/pdx/runtime/frame.rep, revision 1.1.1.1

1.1       root        1: /* Copyright (c) 1982 Regents of the University of California */
                      2: 
                      3: /* static char sccsid[] = "@(#)frame.rep 1.2 1/18/82"; */
                      4: 
                      5: /*
                      6:  * Definitions for accessing stack frames.
                      7:  */
                      8: 
                      9: #define MAINBLK                1
                     10: 
                     11: /*
                     12:  * Structure of an activation record's block mark.  See the
                     13:  * PX implementation notes for more details.
                     14:  */
                     15: 
                     16: struct frame {
                     17:        ADDRESS stackref;       /* for px self-checking */
                     18:        ADDRESS file;           /* current file information */
                     19:        ADDRESS blockp;         /* pointer to current block name */
                     20:        ADDRESS *save_loc;      /* saved local variable pointer */
                     21:        ADDRESS *save_disp;     /* saved dp contents */
                     22:        ADDRESS *save_dp;       /* saved dp */
                     23:        ADDRESS save_pc;        /* saved location counter */
                     24:        int save_lino;          /* saved source line number (never used) */
                     25: };
                     26: 
                     27: FRAME *curframe();             /* get the currently active frame */
                     28: FRAME *nextframe();            /* go up the stack */
                     29: FRAME *findframe();            /* find the frame for a given function */
                     30: ADDRESS entry();               /* get the entry address for a frame */
                     31: ADDRESS *dispval();            /* display associated with a given block */
                     32: ADDRESS *curdp();              /* return current display pointer */
                     33: ADDRESS *contents();           /* return the contents of display pointer */
                     34: ADDRESS stkaddr();             /* stack address associated with a frame */

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