PWB1/sys/source/s2/yacc.d/y5.c
# include <stdio.h>
# include "files"
#ifndef TWOPASS
# include "dextern"
# define a amem
# define mem mem0
# define pa indgo
# define yypact temp1
# define greed tystate
int * ggreed { lkst };
int * pgo {wsets };
int *yypgo { nontrst };
#endif
#ifdef TWOPASS
# define YYFLAG1 -1000
# define _memsize 4000
# define _actsize 2000
# define _nstates 475
# define _nnonterm 100
/* languages */
# define C 0
# define RATFOR 1
# define EFL 2
FILE *finput;
FILE *foutput;
FILE *ftable;
int yypact[_nstates];
int yypgo[_nnonterm];
int mem[ _memsize ];
int nnonter;
int nstate;
int a[_actsize]; /* representation of the parser */
int pa[_nstates]; /* index into a */
int greed[_nstates];
int pgo[_nnonterm];
int ggreed[_nnonterm];
int lflag 0;
#endif
int maxspr 0; /* maximum spread of any entry */
int maxoff 0; /* maximum offset into a array */
int *pmem { mem };
int *maxa;
# define NOMORE -1000
int nxdb 0;
int adb 0;
#ifdef TWOPASS
char *ofiles[] { FILEC,
FILER,
FILEE } ;
main( argc, argv ) char *argv[]; {
register i, j;
/* get the options, if any */
foutput = NULL;
if( argc > 1 ){
for( i=0; j=argv[1][i]; ++i ){
switch(j){
case 'c': lflag = C; continue;
case 'r': lflag = RATFOR; continue;
case 'e': lflag = EFL; continue;
case 'v':
if( (foutput=fopen(FILEU,"a")) == NULL )
error( "cannot open user output file" );
continue;
}
}
}
/* open the input and output files */
if( (ftable=fopen(ofiles[lflag],"a"))==NULL )
error( "missing output file" );
callopt();
exit(0);
}
#endif
callopt(){
register i, *p, j, k, *q;
/* read the arrays from tempfile and set parameters */
if( (finput=fopen(TEMPNAME,"r")) == NULL ) error( "optimizer cannot open tempfile" );
pgo[0] = 0;
yypact[0] = 0;
nstate = 0;
nnonter = 0;
for(;;){
switch( gtnm() ){
case '\n':
yypact[++nstate] = (--pmem) - mem;
case ',':
continue;
case '$':
break;
default:
error( "bad tempfile" );
}
break;
}
yypact[nstate] = yypgo[0] = (--pmem) - mem;
for(;;){
switch( gtnm() ){
case '\n':
yypgo[++nnonter]= pmem-mem;
case ',':
continue;
case EOF:
break;
default:
error( "bad tempfile" );
}
break;
}
yypgo[nnonter--] = (--pmem) - mem;
for( i=0; i<nstate; ++i ){
k = 32000;
j = 0;
q = mem + yypact[i+1];
for( p = mem + yypact[i]; p<q ; p =+ 2 ){
if( *p > j ) j = *p;
if( *p < k ) k = *p;
}
if( k <= j ){ /* nontrivial situation */
/* temporarily, kill this for compatibility
j =- k; /* j is now the range */
if( k > maxoff ) maxoff = k;
}
greed[i] = (yypact[i+1]-yypact[i]) + 2*j;
if( j > maxspr ) maxspr = j;
}
/* initialize ggreed table */
for( i=1; i<=nnonter; ++i ){
ggreed[i] = 1;
j = 0;
/* minimum entry index is always 0 */
q = mem + yypgo[i+1] -1;
for( p = mem+yypgo[i]; p<q ; p =+ 2 ) {
ggreed[i] =+ 2;
if( *p > j ) j = *p;
}
ggreed[i] = ggreed[i] + 2*j;
if( j > maxoff ) maxoff = j;
}
/* now, prepare to put the shift actions into the a array */
for( i=0; i<_actsize; ++i ) a[i] = 0;
maxa = a;
for( i=0; i<nstate; ++i ) {
if( greed[i]==0 && adb>1 ) fprintf( ftable, "State %d: null\n", i );
pa[i] = YYFLAG1;
}
while( (i = nxti()) != NOMORE ) {
if( i >= 0 ) stin(i);
else gin(-i);
}
if( adb>2 ){ /* print a array */
for( p=a; p <= maxa; p =+ 10){
fprintf( ftable, "%4d ", p-a );
for( i=0; i<10; ++i ) fprintf( ftable, "%4d ", p[i] );
fprintf( ftable, "\n" );
}
}
/* write out the output appropriate to the language */
switch( lflag ) {
case C:
coutput();
break;
case RATFOR:
routput();
break;
case EFL:
eoutput();
break;
}
osummary();
ZAPFILE(TEMPNAME);
}
gin(i){
register *p, *r, *s, *q1, *q2;
/* enter gotos on nonterminal i into array a */
ggreed[i] = 0;
q2 = mem+ yypgo[i+1] - 1;
q1 = mem + yypgo[i];
/* now, find a place for it */
for( p=a; p < &a[_actsize]; ++p ){
if( *p ) continue;
for( r=q1; r<q2; r=+2 ){
s = p + *r +1;
if( *s ) goto nextgp;
if( s > maxa ){
if( (maxa=s) > &a[_actsize] ) error( "a array overflow" );
}
}
/* we have found a spot */
*p = *q2;
if( p > maxa ){
if( (maxa=p) > &a[_actsize] ) error( "a array overflow" );
}
for( r=q1; r<q2; r=+2 ){
s = p + *r + 1;
*s = r[1];
}
pgo[i] = p-a;
if( adb>1 ) fprintf( ftable, "Nonterminal %d, entry at %d\n" , i, pgo[i] );
goto nextgi;
nextgp: ;
}
error( "cannot place goto %d\n", i );
nextgi: ;
}
stin(i){
register *r, *s, n, flag, j, *q1, *q2;
greed[i] = 0;
/* enter state i into the a array */
q2 = mem+yypact[i+1];
q1 = mem+yypact[i];
/* find an acceptable place */
for( n= -maxoff; n<_actsize; ++n ){
flag = 0;
for( r = q1; r < q2; r =+ 2 ){
if( (s = *r + n + a ) < a ) goto nextn;
if( *s == 0 ) ++flag;
else if( *s != r[1] ) goto nextn;
}
/* check that the position equals another only if the states are identical */
for( j=0; j<nstate; ++j ){
if( pa[j] == n ) {
if( flag ) goto nextn; /* we have some disagreement */
if( yypact[j+1] + yypact[i] == yypact[j] + yypact[i+1] ){
/* states are equal */
pa[i] = n;
if( adb>1 ) fprintf( ftable, "State %d: entry at %d equals state %d\n",
i, n, j );
return;
}
goto nextn; /* we have some disagreement */
}
}
for( r = q1; r < q2; r =+ 2 ){
if( (s = *r + n + a ) >= &a[_actsize] ) error( "out of space in optimizer a array" );
if( s > maxa ) maxa = s;
if( *s != 0 && *s != r[1] ) error( "clobber of a array, pos'n %d, by %d", s-a, r[1] );
*s = r[1];
}
pa[i] = n;
if( adb>1 ) fprintf( ftable, "State %d: entry at %d\n", i, pa[i] );
return;
nextn: ;
}
error( "Error; failure to place state %d\n", i );
}
#ifdef TWOPASS
#ifdef lint
%varargs
#endif
error( s, x, y ) char *s; {
fprintf( stderr, "Fatal error: " );
fprintf( stderr, s, x, y );
fprintf( stderr, "\n" );
exit(1);
}
#endif
nxti(){ /* finds the next i */
register i, max, maxi;
max = 0;
for( i=1; i<= nnonter; ++i ) if( ggreed[i] >= max ){
max = ggreed[i];
maxi = -i;
}
for( i=0; i<nstate; ++i ) if( greed[i] >= max ){
max = greed[i];
maxi = i;
}
if( nxdb ) fprintf( ftable, "nxti = %d, max = %d\n", maxi, max );
if( max==0 ) return( NOMORE );
else return( maxi );
}
osummary(){
/* write summary */
register i, *p;
if( foutput == NULL ) return;
i=0;
for( p=maxa; p>=a; --p ) {
if( *p == 0 ) ++i;
}
fprintf( foutput, "Optimizer space used: input %d/%d, output %d/%d\n",
pmem-mem+1, _memsize, maxa-a+1, _actsize );
fprintf( foutput, "%d table entries, %d zero\n", (maxa-a)+1, i );
fprintf( foutput, "maximum spread: %d, maximum offset: %d\n", maxspr, maxoff );
}
coutput(){ /* this version is for C */
/* write out the optimized parser */
fprintf( ftable, "#\nextern int yychar;\n\n" );
fprintf( ftable, "int yylast %d;\n", maxa-a+1 );
arout( "yyact", a, (maxa-a)+1 );
arout( "yypact", pa, nstate );
arout( "yypgo", pgo, nnonter+1 );
}
arout( s, v, n ) char *s; int *v, n; {
register i;
fprintf( ftable, "%s[]{\n", s );
for( i=0; i<n; ){
if( i%10 == 0 ) fprintf( ftable, "\n" );
fprintf( ftable, "%4d", v[i] );
if( ++i == n ) fprintf( ftable, " };\n" );
else fprintf( ftable, "," );
}
}
gtnm(){
register s, val, c;
/* read and convert an integer from the standard input */
/* return the terminating character */
/* blanks, tabs, and newlines are ignored */
s = 1;
val = 0;
while( (c=getc(finput)) != EOF ){
if( isdigit(c) ){
val = val * 10 + c - '0';
}
else if ( c == '-' ) s = -1;
else break;
}
*pmem++ = s*val;
if( pmem > &mem[_memsize] ) error( "out of space" );
return( c );
}
routput(){ /* produce ratfor output (groan! ); */
fprintf( ftable, "define YYERROR goto 975\n" );
fprintf( ftable, "define YYABORT return(1)\n" );
fprintf( ftable, "define YYACCEPT return(0)\n" );
fprintf( ftable, "integer function yypars( yyargu )\n" );
fprintf( ftable, "define YYLAST %d\n", (maxa-a)+1 );
fprintf( ftable, "common /yycomn/ yylval, yyval, yypv, yyvalv(150)\n" );
fprintf( ftable, "common /yylcom/ yychar, yyerrf, yydebu\n" );
fprintf( ftable, "integer yyval, yypv, yylval, yychar, yydebu, yynerr, yystat, yyargu\n" );
fprintf( ftable, "integer yylex,yyexcp,yys(150),yyerrf,yyvalv,yyn,yyj,yypvt,yym\n" );
pcom( "yyact", (maxa-a)+1 );
pcom( "yypact", nstate );
pcom( "yypgo", nnonter+1 );
fprintf( ftable, "integer yyr1(YYNPROD)\n" );
fprintf( ftable, "integer yyr2(YYNPROD)\n" );
pcom( "yychk", nstate );
pcom( "yydef", nstate );
farout( "yyact", a, (maxa-a)+1 );
farout( "yypact", pa, nstate );
farout( "yypgo", pgo, nnonter+1 );
}
farout( s, v, n ) char *s; int *v, n; {
/* output the array v, size n, as array s, in fortran */
register i;
for( i=1; i<=n; ++i ){
fprintf( ftable, " data %s(%d)/%d/;\n" , s, i, v[i-1] );
}
}
eoutput(){ /* produce efl output (semi-groan! ); */
fprintf( ftable, "define YYERROR = goto yyerrlab\n" );
fprintf( ftable, "define YYABORT = return(1)\n" );
fprintf( ftable, "define YYACCEPT = return(0)\n" );
fprintf( ftable, "integer procedure yypars(yyargu)\n\n" );
fprintf( ftable, "define YYLAST = %d\n\n", (maxa-a)+1 );
fprintf( ftable, "common (yycomn) yylval, yyval, yypv, yyvalv(YYSTKSIZE)\n" );
fprintf( ftable, "integer yylval, yyval, yypv, yyvalv\n\n" );
fprintf( ftable, "common (yylcom) yychar, yyerrf, yydebu\n" );
fprintf( ftable, "integer yychar, yyerrf, yydebu\n\n" );
fprintf( ftable, "integer yynerr, yystat, yyargu\n" );
fprintf( ftable, "integer yylex, yyexcp, yys(YYSTKSIZE), yyn, yyj, yym\n\n" );
pcom( "yyact", (maxa-a)+1 );
pcom( "yypact", nstate );
pcom( "yypgo", nnonter+1 );
fprintf( ftable, "integer yyr1(YYNPROD)\n" );
fprintf( ftable, "integer yyr2(YYNPROD)\n" );
pcom( "yychk", nstate );
pcom( "yydef", nstate );
earout( "yyact", a, (maxa-a)+1 );
earout( "yypact", pa, nstate );
earout( "yypgo", pgo, nnonter+1 );
}
earout( s, v, n ) char *s; int *v, n; {
/* output the array v, size n, as array s, in efl */
register i;
fprintf( ftable, "\ninitial %s = (", s);
for( i=0; i<n; ){
if( i%10 == 0 ) fprintf( ftable, "\n\t" );
fprintf( ftable, "%5d", v[i] );
if( ++i == n ) fprintf( ftable, " )\n\n" );
else fprintf( ftable, "," );
}
}
pcom( s, n ) char *s; {
fprintf( ftable, "integer %s(%d)\n", s, n );
}