/* @(#)sub2.c 1.3 */ /* sub2.c */ # include "ldefs.c" cfoll(v) int v; { register int i,j,k; char *p; i = name[v]; if(i < NCH) i = 1; /* character */ switch(i){ case 1: case RSTR: case RCCL: case RNCCL: case RNULLS: for(j=0;j<tptr;j++) tmpstat[j] = FALSE; count = 0; follow(v); # ifdef PP padd(foll,v); /* packing version */ # endif # ifndef PP add(foll,v); /* no packing version */ # endif if(i == RSTR) cfoll(left[v]); else if(i == RCCL || i == RNCCL){ /* compress ccl list */ for(j=1; j<NCH;j++) symbol[j] = (i==RNCCL); p = (char *)left[v]; while(*p) symbol[*p++] = (i == RCCL); p = pcptr; for(j=1;j<NCH;j++) if(symbol[j]){ for(k=0;p+k < pcptr; k++) if(cindex[j] == *(p+k)) break; if(p+k >= pcptr)*pcptr++ = cindex[j]; } *pcptr++ = 0; if(pcptr > pchar + pchlen) error("Too many packed character classes"); left[v] = (int)p; name[v] = RCCL; /* RNCCL eliminated */ # ifdef DEBUG if(debug && *p){ printf("ccl %d: %d",v,*p++); while(*p) printf(", %d",*p++); putchar('\n'); } # endif } break; case CARAT: cfoll(left[v]); break; case STAR: case PLUS: case QUEST: case RSCON: cfoll(left[v]); break; case BAR: case RCAT: case DIV: case RNEWE: cfoll(left[v]); cfoll(right[v]); break; # ifdef DEBUG case FINAL: case S1FINAL: case S2FINAL: break; default: warning("bad switch cfoll %d",v); # endif } return; } # ifdef DEBUG pfoll() { register int i,k,*p; int j; /* print sets of chars which may follow positions */ printf("pos\tchars\n"); for(i=0;i<tptr;i++) if(p=foll[i]){ j = *p++; if(j >= 1){ printf("%d:\t%d",i,*p++); for(k=2;k<=j;k++) printf(", %d",*p++); putchar('\n'); } } return; } # endif add(array,n) int **array; int n; { register int i, *temp; register char *ctemp; temp = nxtpos; ctemp = tmpstat; array[n] = nxtpos; /* note no packing is done in positions */ *temp++ = count; for(i=0;i<tptr;i++) if(ctemp[i] == TRUE) *temp++ = i; nxtpos = temp; if(nxtpos >= positions+maxpos) error("Too many positions %s",(maxpos== MAXPOS?"\nTry using %p num":"")); return; } follow(v) int v; { register int p; if(v >= tptr-1)return; p = parent[v]; if(p == 0) return; switch(name[p]){ /* will not be CHAR RNULLS FINAL S1FINAL S2FINAL RCCL RNCCL */ case RSTR: if(tmpstat[p] == FALSE){ count++; tmpstat[p] = TRUE; } break; case STAR: case PLUS: first(v); follow(p); break; case BAR: case QUEST: case RNEWE: follow(p); break; case RCAT: case DIV: if(v == left[p]){ if(nullstr[right[p]]) follow(p); first(right[p]); } else follow(p); break; case RSCON: case CARAT: follow(p); break; # ifdef DEBUG default: warning("bad switch follow %d",p); # endif } return; } first(v) /* calculate set of positions with v as root which can be active initially */ int v; { register int i; register char *p; i = name[v]; if(i < NCH)i = 1; switch(i){ case 1: case RCCL: case RNCCL: case RNULLS: case FINAL: case S1FINAL: case S2FINAL: if(tmpstat[v] == FALSE){ count++; tmpstat[v] = TRUE; } break; case BAR: case RNEWE: first(left[v]); first(right[v]); break; case CARAT: if(stnum % 2 == 1) first(left[v]); break; case RSCON: i = stnum/2 +1; p = (char *)right[v]; while(*p) if(*p++ == i){ first(left[v]); break; } break; case STAR: case QUEST: case PLUS: case RSTR: first(left[v]); break; case RCAT: case DIV: first(left[v]); if(nullstr[left[v]]) first(right[v]); break; # ifdef DEBUG default: warning("bad switch first %d",v); # endif } return; } cgoto(){ register int i, j, s; int npos, curpos, n; int tryit; char tch[NCH]; int tst[NCH]; char *q; /* generate initial state, for each start condition */ if(ratfor){ fprintf(fout,"blockdata\n"); fprintf(fout,"common /Lvstop/ vstop\n"); fprintf(fout,"define Svstop %d\n",nstates+1); fprintf(fout,"integer vstop(Svstop)\n"); } else fprintf(fout,"int yyvstop[] = {\n0,\n"); while(stnum < 2 || stnum/2 < sptr){ for(i = 0; i<tptr; i++) tmpstat[i] = 0; count = 0; if(tptr > 0)first(tptr-1); add(state,stnum); # ifdef DEBUG if(debug){ if(stnum > 1) printf("%s:\n",sname[stnum/2]); pstate(stnum); } # endif stnum++; } stnum--; /* even stnum = might not be at line begin */ /* odd stnum = must be at line begin */ /* even states can occur anywhere, odd states only at line begin */ for(s = 0; s <= stnum; s++){ tryit = FALSE; cpackflg[s] = FALSE; sfall[s] = -1; acompute(s); for(i=0;i<NCH;i++) symbol[i] = 0; npos = *state[s]; for(i = 1; i<=npos; i++){ curpos = *(state[s]+i); if(name[curpos] < NCH) symbol[name[curpos]] = TRUE; else switch(name[curpos]){ case RCCL: tryit = TRUE; q = (char *)left[curpos]; while(*q){ for(j=1;j<NCH;j++) if(cindex[j] == *q) symbol[j] = TRUE; q++; } break; case RSTR: symbol[right[curpos]] = TRUE; break; # ifdef DEBUG case RNULLS: case FINAL: case S1FINAL: case S2FINAL: break; default: warning("bad switch cgoto %d state %d",curpos,s); break; # endif } } # ifdef DEBUG if(debug){ printf("State %d transitions on:\n\t",s); charc = 0; for(i = 1; i<NCH; i++){ if(symbol[i]) allprint(i); if(charc > LINESIZE){ charc = 0; printf("\n\t"); } } putchar('\n'); } # endif /* for each char, calculate next state */ n = 0; for(i = 1; i<NCH; i++){ if(symbol[i]){ nextstate(s,i); /* executed for each state, transition pair */ xstate = notin(stnum); if(xstate == -2) warning("bad state %d %o",s,i); else if(xstate == -1){ if(stnum >= nstates) error("Too many states %s",(nstates == NSTATES ? "\nTry using %n num":"")); add(state,++stnum); # ifdef DEBUG if(debug)pstate(stnum); # endif tch[n] = i; tst[n++] = stnum; } else { /* xstate >= 0 ==> state exists */ tch[n] = i; tst[n++] = xstate; } } } tch[n] = 0; tst[n] = -1; /* pack transitions into permanent array */ if(n > 0) packtrans(s,tch,tst,n,tryit); else gotof[s] = -1; } ratfor ? fprintf(fout,"end\n") : fprintf(fout,"0};\n"); return; } /* Beware -- 70% of total CPU time is spent in this subroutine - if you don't believe me - try it yourself ! */ nextstate(s,c) int s,c; { register int j, *newpos; register char *temp, *tz; int *pos, i, *f, num, curpos, number; /* state to goto from state s on char c */ num = *state[s]; temp = tmpstat; pos = state[s] + 1; for(i = 0; i<num; i++){ curpos = *pos++; j = name[curpos]; if(j < NCH && j == c || j == RSTR && c == right[curpos] || j == RCCL && member(c,left[curpos])){ f = foll[curpos]; number = *f; newpos = f+1; for(j=0;j<number;j++) temp[*newpos++] = 2; } } j = 0; tz = temp + tptr; while(temp < tz){ if(*temp == 2){ j++; *temp++ = 1; } else *temp++ = 0; } count = j; return; } notin(n) int n; { /* see if tmpstat occurs previously */ register int *j,k; register char *temp; int i; if(count == 0) return(-2); temp = tmpstat; for(i=n;i>=0;i--){ /* for each state */ j = state[i]; if(count == *j++){ for(k=0;k<count;k++) if(!temp[*j++])break; if(k >= count) return(i); } } return(-1); } packtrans(st,tch,tst,cnt,tryit) int st, *tst, cnt,tryit; char *tch; { /* pack transitions into nchar, nexts */ /* nchar is terminated by '\0', nexts uses cnt, followed by elements */ /* gotof[st] = index into nchr, nexts for state st */ /* sfall[st] = t implies t is fall back state for st */ /* == -1 implies no fall back */ int cmin, cval, tcnt, diff, p, *ast; register int i,j,k; char *ach; int go[NCH], temp[NCH], c; int swork[NCH]; char cwork[NCH]; int upper; rcount += cnt; cmin = -1; cval = NCH; ast = tst; ach = tch; /* try to pack transitions using ccl's */ if(!optim)goto nopack; /* skip all compaction */ if(tryit){ /* ccl's used */ for(i=1;i<NCH;i++){ go[i] = temp[i] = -1; symbol[i] = 1; } for(i=0;i<cnt;i++){ go[tch[i]] = tst[i]; symbol[tch[i]] = 0; } for(i=0; i<cnt;i++){ c = match[tch[i]]; if(go[c] != tst[i] || c == tch[i]) temp[tch[i]] = tst[i]; } /* fill in error entries */ for(i=1;i<NCH;i++) if(symbol[i]) temp[i] = -2; /* error trans */ /* count them */ k = 0; for(i=1;i<NCH;i++) if(temp[i] != -1)k++; if(k <cnt){ /* compress by char */ # ifdef DEBUG if(debug) printf("use compression %d, %d vs %d\n",st,k,cnt); # endif k = 0; for(i=1;i<NCH;i++) if(temp[i] != -1){ cwork[k] = i; swork[k++] = (temp[i] == -2 ? -1 : temp[i]); } cwork[k] = 0; # ifdef PC ach = cwork; ast = swork; cnt = k; cpackflg[st] = TRUE; # endif } } for(i=0; i<st; i++){ /* get most similar state */ /* reject state with more transitions, state already represented by a third state, and state which is compressed by char if ours is not to be */ if(sfall[i] != -1) continue; if(cpackflg[st] == 1) if(!(cpackflg[i] == 1)) continue; p = gotof[i]; if(p == -1) /* no transitions */ continue; tcnt = nexts[p]; if(tcnt > cnt) continue; diff = 0; k = 0; j = 0; upper = p + tcnt; while(ach[j] && p < upper){ while(ach[j] < nchar[p] && ach[j]){diff++; j++; } if(ach[j] == 0)break; if(ach[j] > nchar[p]){diff=NCH;break;} /* ach[j] == nchar[p] */ if(ast[j] != nexts[++p] || ast[j] == -1 || (cpackflg[st] && ach[j] != match[ach[j]]))diff++; j++; } while(ach[j]){ diff++; j++; } if(p < upper)diff = NCH; if(diff < cval && diff < tcnt){ cval = diff; cmin = i; if(cval == 0)break; } } /* cmin = state "most like" state st */ # ifdef DEBUG if(debug)printf("select st %d for st %d diff %d\n",cmin,st,cval); # endif # ifdef PS if(cmin != -1){ /* if we can use st cmin */ gotof[st] = nptr; k = 0; sfall[st] = cmin; p = gotof[cmin]+1; j = 0; while(ach[j]){ /* if cmin has a transition on c, then so will st */ /* st may be "larger" than cmin, however */ while(ach[j] < nchar[p-1] && ach[j]){ k++; nchar[nptr] = ach[j]; nexts[++nptr] = ast[j]; j++; } if(nchar[p-1] == 0)break; if(ach[j] > nchar[p-1]){ warning("bad transition %d %d",st,cmin); goto nopack; } /* ach[j] == nchar[p-1] */ if(ast[j] != nexts[p] || ast[j] == -1 || (cpackflg[st] && ach[j] != match[ach[j]])){ k++; nchar[nptr] = ach[j]; nexts[++nptr] = ast[j]; } p++; j++; } while(ach[j]){ nchar[nptr] = ach[j]; nexts[++nptr] = ast[j++]; k++; } nexts[gotof[st]] = cnt = k; nchar[nptr++] = 0; } else { # endif nopack: /* stick it in */ gotof[st] = nptr; nexts[nptr] = cnt; for(i=0;i<cnt;i++){ nchar[nptr] = ach[i]; nexts[++nptr] = ast[i]; } nchar[nptr++] = 0; # ifdef PS } # endif if(cnt < 1){ gotof[st] = -1; nptr--; } else if(nptr > ntrans) error("Too many transitions %s",(ntrans==NTRANS?"\nTry using %a num":"")); return; } # ifdef DEBUG pstate(s) int s; { register int *p,i,j; printf("State %d:\n",s); p = state[s]; i = *p++; if(i == 0) return; printf("%4d",*p++); for(j = 1; j<i; j++){ printf(", %4d",*p++); if(j%30 == 0)putchar('\n'); } putchar('\n'); return; } # endif member(d,t) int d; char *t; { register int c; register char *s; c = d; s = t; c = cindex[c]; while(*s) if(*s++ == c) return(1); return(0); } # ifdef DEBUG stprt(i) int i; { register int p, t; printf("State %d:",i); /* print actions, if any */ t = atable[i]; if(t != -1)printf(" final"); putchar('\n'); if(cpackflg[i] == TRUE)printf("backup char in use\n"); if(sfall[i] != -1)printf("fall back state %d\n",sfall[i]); p = gotof[i]; if(p == -1) return; printf("(%d transitions)\n",nexts[p]); while(nchar[p]){ charc = 0; if(nexts[p+1] >= 0) printf("%d\t",nexts[p+1]); else printf("err\t"); allprint(nchar[p++]); while(nexts[p] == nexts[p+1] && nchar[p]){ if(charc > LINESIZE){ charc = 0; printf("\n\t"); } allprint(nchar[p++]); } putchar('\n'); } putchar('\n'); return; } # endif acompute(s) /* compute action list = set of poss. actions */ int s; { register int *p, i, j; int cnt, m; int temp[300], k, neg[300], n; k = 0; n = 0; p = state[s]; cnt = *p++; if(cnt > 300) error("Too many positions for one state - acompute"); for(i=0;i<cnt;i++){ if(name[*p] == FINAL)temp[k++] = left[*p]; else if(name[*p] == S1FINAL){temp[k++] = left[*p]; if (left[*p] >NACTIONS) error("Too many right contexts"); extra[left[*p]] = 1; } else if(name[*p] == S2FINAL)neg[n++] = left[*p]; p++; } atable[s] = -1; if(k < 1 && n < 1) return; # ifdef DEBUG if(debug) printf("final %d actions:",s); # endif /* sort action list */ for(i=0; i<k; i++) for(j=i+1;j<k;j++) if(temp[j] < temp[i]){ m = temp[j]; temp[j] = temp[i]; temp[i] = m; } /* remove dups */ for(i=0;i<k-1;i++) if(temp[i] == temp[i+1]) temp[i] = 0; /* copy to permanent quarters */ atable[s] = aptr; # ifdef DEBUG if(!ratfor)fprintf(fout,"/* actions for state %d */",s); # endif putc('\n',fout); for(i=0;i<k;i++) if(temp[i] != 0){ ratfor ? fprintf(fout,"data vstop(%d)/%d/\n",aptr,temp[i]) : fprintf(fout,"%d,\n",temp[i]); # ifdef DEBUG if(debug) printf("%d ",temp[i]); # endif aptr++; } for(i=0;i<n;i++){ /* copy fall back actions - all neg */ ratfor ? fprintf(fout,"data vstop(%d)/%d/\n",aptr,neg[i]) : fprintf(fout,"%d,\n",neg[i]); aptr++; # ifdef DEBUG if(debug)printf("%d ",neg[i]); # endif } # ifdef DEBUG if(debug)putchar('\n'); # endif ratfor ? fprintf(fout,"data vstop (%d)/0/\n",aptr) : fprintf(fout,"0,\n"); aptr++; return; } # ifdef DEBUG pccl() { /* print character class sets */ register int i, j; printf("char class intersection\n"); for(i=0; i< ccount; i++){ charc = 0; printf("class %d:\n\t",i); for(j=1;j<NCH;j++) if(cindex[j] == i){ allprint(j); if(charc > LINESIZE){ printf("\n\t"); charc = 0; } } putchar('\n'); } charc = 0; printf("match:\n"); for(i=0;i<NCH;i++){ allprint(match[i]); if(charc > LINESIZE){ putchar('\n'); charc = 0; } } putchar('\n'); return; } # endif mkmatch(){ register int i; char tab[NCH]; for(i=0; i<ccount; i++) tab[i] = 0; for(i=1;i<NCH;i++) if(tab[cindex[i]] == 0) tab[cindex[i]] = i; /* tab[i] = principal char for new ccl i */ for(i = 1; i<NCH; i++) match[i] = tab[cindex[i]]; return; } layout(){ /* format and output final program's tables */ register int i, j, k; int top, bot, startup, omin; startup = 0; for(i=0; i<outsize;i++) verify[i] = advance[i] = 0; omin = 0; yytop = 0; for(i=0; i<= stnum; i++){ /* for each state */ j = gotof[i]; if(j == -1){ stoff[i] = 0; continue; } bot = j; while(nchar[j])j++; top = j - 1; # if DEBUG if (debug) { printf("State %d: (layout)\n", i); for(j=bot; j<=top;j++) { printf(" %o", nchar[j]); if (j%10==0) putchar('\n'); } putchar('\n'); } # endif while(verify[omin+ZCH]) omin++; startup = omin; # if DEBUG if (debug) printf("bot,top %d, %d startup begins %d\n",bot,top,startup); # endif if(chset){ do { startup += 1; if(startup > outsize - ZCH) error("output table overflow"); for(j = bot; j<= top; j++){ k=startup+ctable[nchar[j]]; if(verify[k])break; } } while (j <= top); # if DEBUG if (debug) printf(" startup will be %d\n",startup); # endif /* have found place */ for(j = bot; j<= top; j++){ k = startup + ctable[nchar[j]]; if (ctable[nchar[j]]<=0) printf("j %d nchar %d ctable.nch %d\n",j,nchar[j],ctable[nchar[k]]); verify[k] = i+1; /* state number + 1*/ advance[k] = nexts[j+1]+1; /* state number + 1*/ if(yytop < k) yytop = k; } } else { do { startup += 1; if(startup > outsize - ZCH) error("output table overflow"); for(j = bot; j<= top; j++){ k = startup + nchar[j]; if(verify[k])break; } } while (j <= top); /* have found place */ # if DEBUG if (debug) printf(" startup going to be %d\n", startup); # endif for(j = bot; j<= top; j++){ k = startup + nchar[j]; verify[k] = i+1; /* state number + 1*/ advance[k] = nexts[j+1]+1; /* state number + 1*/ if(yytop < k) yytop = k; } } stoff[i] = startup; } /* stoff[i] = offset into verify, advance for trans for state i */ /* put out yywork */ if(ratfor){ fprintf(fout, "define YYTOPVAL %d\n", yytop); rprint(verify,"verif",yytop+1); rprint(advance,"advan",yytop+1); shiftr(stoff, stnum); rprint(stoff,"stoff",stnum+1); shiftr(sfall, stnum); upone(sfall, stnum+1); rprint(sfall,"sfall",stnum+1); bprint(extra,"extra",casecount+1); bprint(match,"match",NCH); shiftr(atable, stnum); rprint(atable,"atable",stnum+1); return; } fprintf(fout,"# define YYTYPE %s\n",stnum+1 > NCH ? "int" : "char"); fprintf(fout,"struct yywork { YYTYPE verify, advance; } yycrank[] = {\n"); for(i=0;i<=yytop;i+=4){ for(j=0;j<4;j++){ k = i+j; if(verify[k]) fprintf(fout,"%d,%d,\t",verify[k],advance[k]); else fprintf(fout,"0,0,\t"); } putc('\n',fout); } fprintf(fout,"0,0};\n"); /* put out yysvec */ fprintf(fout,"struct yysvf yysvec[] = {\n"); fprintf(fout,"0,\t0,\t0,\n"); for(i=0;i<=stnum;i++){ /* for each state */ if(cpackflg[i])stoff[i] = -stoff[i]; fprintf(fout,"yycrank+%d,\t",stoff[i]); if(sfall[i] != -1) fprintf(fout,"yysvec+%d,\t", sfall[i]+1); /* state + 1 */ else fprintf(fout,"0,\t\t"); if(atable[i] != -1) fprintf(fout,"yyvstop+%d,",atable[i]); else fprintf(fout,"0,\t"); # ifdef DEBUG fprintf(fout,"\t\t/* state %d */",i); # endif putc('\n',fout); } fprintf(fout,"0,\t0,\t0};\n"); /* put out yymatch */ fprintf(fout,"struct yywork *yytop = yycrank+%d;\n",yytop); fprintf(fout,"struct yysvf *yybgin = yysvec+1;\n"); if(optim){ fprintf(fout,"char yymatch[] = {\n"); if (chset==0) /* no chset, put out in normal order */ { for(i=0; i<NCH; i+=8){ for(j=0; j<8; j++){ int fbch; fbch = match[i+j]; if(printable(fbch) && fbch != '\'' && fbch != '\\') fprintf(fout,"'%c' ,",fbch); else fprintf(fout,"0%-3o,",fbch); } putc('\n',fout); } } else { int *fbarr; fbarr = (int *)myalloc(2*NCH, sizeof(*fbarr)); if (fbarr==0) error("No space for char table reverse",0); for(i=0; i<ZCH; i++) fbarr[i]=0; for(i=0; i<NCH; i++) fbarr[ctable[i]] = ctable[match[i]]; for(i=0; i<ZCH; i+=8) { for(j=0; j<8; j++) fprintf(fout, "0%-3o,",fbarr[i+j]); putc('\n',fout); } cfree((char *)fbarr, 2*NCH, 1); } fprintf(fout,"0};\n"); } /* put out yyextra */ fprintf(fout,"char yyextra[] = {\n"); for(i=0;i<casecount;i+=8){ for(j=0;j<8;j++) fprintf(fout, "%d,", i+j<NACTIONS ? extra[i+j] : 0); putc('\n',fout); } fprintf(fout,"0};\n"); return; } rprint(a,s,n) char *s; int *a, n; { register int i; fprintf(fout,"block data\n"); fprintf(fout,"common /L%s/ %s\n",s,s); fprintf(fout,"define S%s %d\n",s,n); fprintf(fout,"integer %s (S%s)\n",s,s); for(i=1; i<=n; i++) { if (i%8==1) fprintf(fout, "data "); fprintf(fout, "%s (%d)/%d/",s,i,a[i]); fprintf(fout, (i%8 && i<n) ? ", " : "\n"); } fprintf(fout,"end\n"); } shiftr(a, n) int *a; { int i; for(i=n; i>=0; i--) a[i+1]=a[i]; } upone(a,n) int *a; { int i; for(i=0; i<=n ; i++) a[i]++; } bprint(a,s,n) char *s, *a; int n; { register int i, j, k; fprintf(fout,"block data\n"); fprintf(fout,"common /L%s/ %s\n",s,s); fprintf(fout,"define S%s %d\n",s,n); fprintf(fout,"integer %s (S%s)\n",s,s); for(i=1;i<n;i+=8){ fprintf(fout,"data %s (%d)/%d/",s,i,a[i]); for(j=1;j<8;j++){ k = i+j; if(k < n)fprintf(fout,", %s (%d)/%d/",s,k,a[k]); } putc('\n',fout); } fprintf(fout,"end\n"); } # ifdef PP padd(array,n) int **array; int n; { register int i, *j, k; array[n] = nxtpos; if(count == 0){ *nxtpos++ = 0; return; } for(i=tptr-1;i>=0;i--){ j = array[i]; if(j && *j++ == count){ for(k=0;k<count;k++) if(!tmpstat[*j++])break; if(k >= count){ array[n] = array[i]; return; } } } add(array,n); return; } # endif