123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190 |
- #ifndef NORCSID
- static char rcsid[] = "$Id$";
- #endif
- /*
- * This file contains the main part of the top element size computation phase.
- *
- * Author: Hans van Eck.
- */
- #include <stdio.h>
- #include <em_spec.h>
- #include <em_mnem.h>
- #include <em_pseu.h>
- #include "param.h"
- #include "assert.h"
- #include "types.h"
- #include "tes.h"
- #include "alloc.h"
- #include "proinf.h"
- #include "line.h"
- #include "ext.h"
- #include "pop_push.h"
- extern char *pop_push[];
- extern char flow_tab[];
- #define NON_CONTINUABLE(i) (flow_tab[i]&JUMP)
- #define ISABRANCH(i) (flow_tab[i]&HASLABEL)
- #define ISCONDBRANCH(i) (flow_tab[i]&CONDBRA)
- #define INSTR(lnp) (lnp->l_instr & BMASK)
- #define TYPE(lnp) lnp->l_optyp
- #define SHORT(lnp) lnp->l_a.la_short
- #define MINI(lnp) ((lnp->l_optyp & BMASK) - Z_OPMINI)
- #define IS_MINI(lnp) (lnp->l_optyp >= OPMINI)
- #define IS_LOC(l) (l!=(line_p) 0 && INSTR(l)==op_loc && IS_MINI(l))
- int state;
- static int stacktop = 0;
- init_state()
- {
- stacktop = 0;
- state = KNOWN;
- }
- tes_pseudos()
- {
- register line_p lp;
- for (lp = pseudos; lp != (line_p)0; lp = lp->l_next) {
- switch(INSTR(lp)) {
- case ps_con:
- case ps_rom:
- if (lp->l_optyp == OPLIST) {
- register arg_p ap = lp->l_a.la_arg;
- while (ap != (arg_p) 0) {
- if (ap->a_typ == ARGNUM) {
- assign_label(ap->a_a.a_np->n_repl);
- }
- ap = ap->a_next;
- }
- } else if (lp->l_optyp == OPNUMLAB)
- assign_label(lp->l_a.la_np->n_repl);
- }
- }
- }
- tes_instr(lnp, x, y)
- line_p lnp, x, y;
- {
- char *s;
- register instr = INSTR(lnp);
- register int arg, argdef;
- int neg = 0;
- if (instr == op_lab) {
- do_inst_label(lnp);
- return;
- }
- if (instr < sp_fmnem || instr > sp_lmnem) {
- return;
- }
- if (state == NOTREACHED) return; /* What else ? */
- s = pop_push[instr];
- if (*s != '0') {
- while (*s != '\0') {
- neg = (*s++ == '-');
- if (TYPE(lnp) == OPSHORT) {
- arg = SHORT(lnp);
- if (arg < wordsize) arg = wordsize;
- argdef = TRUE;
- } else if (IS_MINI(lnp)) {
- arg = MINI(lnp);
- if (arg > 0 && arg < wordsize) arg = wordsize;
- if (arg < 0 && -arg < wordsize) arg = -wordsize;
- argdef = TRUE;
- } else {
- argdef = FALSE;
- }
- switch (*s++) {
- case 'w': stacktop = wordsize; break;
- case 'd': stacktop = wordsize * 2; break;
- case 'p': stacktop = pointersize; break;
- case 'a':
- if (argdef == FALSE || instr == op_ass) {
- stacktop = 0;
- } else {
- stacktop = arg;
- }
- break;
- case 'x':
- if (IS_LOC(x)) {
- arg = MINI(x);
- if (arg < wordsize) arg = wordsize;
- stacktop = arg;
- } else {
- stacktop = 0;
- }
- break;
- case 'y':
- if (IS_LOC(y)) {
- arg = MINI(y);
- if (arg < wordsize) arg = wordsize;
- stacktop = arg;
- } else {
- stacktop = 0;
- }
- break;
- case '?':
- stacktop = 0;
- break;
- default:
- assert(FALSE);
- }
- }
- /*
- * When the last argument was negative, the element size
- * must be negated. This is to catch 'asp -4'.
- */
- if (neg) stacktop = -stacktop;
- }
- if (stacktop < 0) stacktop = 0;
- if (ISABRANCH(instr)) do_inst_label(lnp);
- if (NON_CONTINUABLE(instr)) {
- state = NOTREACHED;
- stacktop = 0;
- }
- }
- assign_label(label)
- register num_p label;
- {
- if (label->n_flags & NUMSET) {
- if (state == NOTREACHED || stacktop > label->n_size) {
- stacktop = label->n_size;
- } else if ( stacktop < label->n_size) {
- label->n_size = stacktop;
- }
- } else {
- label->n_size = stacktop;
- label->n_flags |= NUMSET;
- }
- }
- do_inst_label(lnp) /* (re-)install a label */
- line_p lnp;
- {
- num_p label = lnp->l_a.la_np->n_repl;
- int instr = INSTR(lnp);
- assign_label(label);
- if (instr == op_lab) {
- if (state == NOTREACHED) {
- } else {
- label->n_flags |= NUMFALLTHROUGH;
- }
- } else if (ISCONDBRANCH(instr)) { /* conditional branch */
- label->n_flags |= NUMCOND;
- }
- state = KNOWN;
- }
|