151 lines
2.8 KiB
C
151 lines
2.8 KiB
C
#ifndef NORCSID
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static char rcsid[] = "$Header$";
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#endif
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#include "assert.h"
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#include "param.h"
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#include "tables.h"
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#include "types.h"
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#include <cg_pattern.h>
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#include "data.h"
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#include "result.h"
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#include "extern.h"
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/*
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* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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* Author: Hans van Staveren
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*/
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/*
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* Package for string allocation and garbage collection.
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* Call salloc(size) to get room for string.
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* Every now and then call garbage_collect() from toplevel.
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*/
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#define MAXSTAB 500
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#define THRESHOLD 200
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char *stab[MAXSTAB];
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int nstab=0;
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string malloc();
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string myalloc(size) {
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register string p;
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p = (string) malloc(size);
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if (p==0)
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fatal("Out of memory");
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return(p);
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}
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myfree(p) string p; {
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free(p);
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}
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popstr(nnstab) {
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register i;
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for (i=nnstab;i<nstab;i++)
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myfree(stab[i]);
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nstab = nnstab;
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}
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char *salloc(size) {
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register char *p;
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if (nstab==MAXSTAB)
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fatal("String table overflow");
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p = myalloc(size+1); /* extra room for terminating zero */
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stab[nstab++] = p;
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return(p);
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}
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compar(p1,p2) char **p1,**p2; {
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assert(*p1 != *p2);
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if (*p1 < *p2)
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return(-1);
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return(1);
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}
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garbage_collect() {
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register i;
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struct emline *emlp;
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token_p tp;
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tkdef_p tdp;
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struct reginfo *rp;
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register char **fillp,**scanp;
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char used[MAXSTAB]; /* could be bitarray */
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if (nstab<THRESHOLD)
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return;
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qsort(stab,nstab,sizeof (char *),compar);
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for (i=0;i<nstab;i++)
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used[i]= FALSE;
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for(emlp=emlines;emlp<emlines+nemlines;emlp++)
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chkstr(emlp->em_soper,used);
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for (tp= fakestack;tp<&fakestack[stackheight];tp++) {
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if (tp->t_token== -1)
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continue;
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tdp = &tokens[tp->t_token];
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for (i=0;i<TOKENSIZE;i++)
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if (tdp->t_type[i] == EV_STR)
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chkstr(tp->t_att[i].as,used);
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}
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for (rp= machregs; rp<machregs+NREGS; rp++) {
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tp = &rp->r_contents;
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assert(tp->t_token != -1);
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tdp= &tokens[tp->t_token];
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for (i=0;i<TOKENSIZE;i++)
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if (tdp->t_type[i] == EV_STR)
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chkstr(tp->t_att[i].as,used);
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}
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for (i=0;i<nstab;i++)
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if (!used[i]) {
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myfree(stab[i]);
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stab[i]=0;
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}
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fillp=stab;
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for (scanp=stab;scanp<stab+nstab;scanp++)
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if (*scanp != 0)
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*fillp++ = *scanp;
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nstab = fillp-stab;
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}
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chkstr(str,used) string str; char used[]; {
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register low,middle,high;
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low=0; high=nstab-1;
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while (high>low) {
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middle= (low+high)>>1;
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if (str==stab[middle]) {
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used[middle]=1;
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return;
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}
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if (str<stab[middle])
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high = middle-1;
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else
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low = middle+1;
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}
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if (low==high) {
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if (str==stab[low]) {
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used[low]=1;
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}
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return;
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}
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}
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