#ifndef NORCSID
static char rcsidp5[] = "$Header$";
#endif

#include "parser.h"
#include "Lpars.h"

FILE *ofile;

outputnopt()
{
	openofile("dfa.c");
	outdfa();
	installofile();
	openofile("trans.c");
	outdotrans();
	installofile();
	openofile("incalls.r");
	outputincalls();
	installofile();
}

static char ofilename[80];
static char ofiletemp[80];

PRIVATE
openofile(filename)
	char *filename;
{
	char *strcpy(), *strcat();
	strcpy(ofilename,filename);
	strcpy(ofiletemp,filename);
	strcat(ofiletemp,".new");
	if((ofile=fopen(ofiletemp,"w"))==NULL) {
		fprintf(stderr,"Fatal Error: cannot open output file %s\n",ofiletemp);
		sys_stop(S_EXIT);
	}
}

PRIVATE
installofile()
{
	/*
	 * if contents of newly generated ofiletemp is different
	 * from that of ofilename then copy over old file else
	 * delete newly generated file
	 */
	register FILE	*f1, *f2;
	register int	c1, c2;
	fclose(ofile);
	if((f1 = fopen(ofiletemp,"r")) == NULL) {
		fprintf(stderr,"Fatal Error: cannont reopen file %s\n",ofiletemp);
		sys_stop(S_EXIT);
	}
	if((f2 = fopen(ofilename,"r")) == NULL) {
		fclose(f1);
		RENAME(ofiletemp,ofilename);
		return;
	}
	do {
		c1 = getc(f1);
		c2 = getc(f2);
	} while (c1 == c2 && c1 != EOF);
	fclose(f1);
	fclose(f2);
	if (c1 != c2) {
		RENAME(ofiletemp,ofilename);
	}
	else UNLINK(ofiletemp);
}

PRIVATE
UNLINK(x)
	char *x;
{
	/* Must remove the file "x" */
	unlink(x);	/* systemcall to remove file */
}

PRIVATE
RENAME(x,y)
	char *x, *y;
{
	/* Must move the file "x" to the file "y" */
	unlink(y);
	if(link(x,y)!=0) {
		fprintf(stderr,"Cannot link to %s",y);
		sys_stop(S_EXIT);
	}
	unlink(x);
}

# define MAXOPCODE 255
# define EMPTY     -1

int *next, *check, *base;
unsigned currsize;		/* current size of next and check arrays */
int maxpos = 0;		/* highest used position in these arrayes */

PRIVATE
increase_next(size)
	int size;
{
	/* realloc arrays next and check so they are at least
	 * of size 'size'
	 */
	char *Realloc();
	unsigned newsize = currsize;
	register int i;
	do {
		newsize *= 2;
	} while (newsize<size);
	printf("Note: Extending next/check arrays from %d to %d\n",currsize,newsize);
	next = (int *)Realloc(next,newsize);
	check = (int *)Realloc(check,newsize);
	/* clear ends of new arrays */
	for(i=currsize;i<newsize;i++)
		next[i] = check[i] = EMPTY;
	currsize = newsize;
}

PRIVATE
store_row(state,row)
	int state;
	register int *row;
{
	/* find a place to store row in arrays */
	register b,i,o;
	register int *n = next;
	b=0;
	for(;;) {
		/* look for first possible place to store it */
		for(i=0;i<MAXOPCODE;i++) {
			if(row[i]) {
				if((o = b+i)>currsize) increase_next(o);
				if(n[o]!=EMPTY) goto nextpos;
			}
		}
		/* found a place */
		base[state]=b;
		for(i=0;i<MAXOPCODE;i++)
			if(row[i]) {
				if((o=b+i) >maxpos) maxpos = o;
				next[o] = row[i];
				check[o] = state;
			}
		return;
	nextpos:
		++b;
	}
}

PRIVATE
outdfa()
{
	register int s,i;
	register struct state *p;
	int nout, ncpy, ngto;
	int row[MAXOPCODE];
	int numinrow;
	int numentries = 0;
			
	fprintf(ofile,"#include \"nopt.h\"\n");
	fprintf(ofile,"\n");
	fprintf(ofile,"int OO_maxreplacement = %d;\n", maxreplacement);
	fprintf(ofile,"\n");

	/* find how many entries in dfa */
	for(s=0;s<=higheststate;s++)
		for(p=states[s];p!=(struct state *)NULL;p=p->next)
			numentries++;
	/* start with next and check arrays twice this size */
	currsize = 2 * numentries;
	next  = (int *)Malloc(currsize*sizeof(int));
	check = (int *)Malloc(currsize*sizeof(int));
	base  = (int *)Malloc(((unsigned)(higheststate+1))*sizeof(int));
	/* fill next array with EMPTY */
	for(i=0;i<currsize;i++) check[i]=next[i]=EMPTY;
	for(s=0;s<=higheststate;s++) {
		/* empty row */
		for(i=0;i<MAXOPCODE;i++) row[i]=0;
		numinrow = 0;
		/* fill in non zero entries */
		for(p=states[s];p!=(struct state *)NULL;p=p->next) {
			numinrow++;
			row[p->op->id_opcode] = p->goto_state;
		}
		/* look for a place to store row */
		if(numinrow)
			store_row(s,row);
		else
			base[s] = EMPTY;
	}
	/* give some statistics on size of dfa */
	printf("Number of patterns: %d\n", numpatterns);
	printf("Longest pattern: %d\n", maxpattern);
	printf("Longest replacement: %d\n", maxreplacement);
	printf("Dfa contains %d states and %d distinct state/opcode pairs\n",
	       higheststate+1,numentries);
	printf("Compacted using row displacement into %d entries\n",maxpos);
	/* output the arrays */
	fprintf(ofile,"struct dfa OO_checknext[] = {\n");
	for(i=0;i<=maxpos;i++) {
		fprintf(ofile,"\t/* %4d */\t",i);
		fprintf(ofile,"{%4d,%4d},\n", check[i], next[i]);
	}
	fprintf(ofile,"};\n\n");
	fprintf(ofile,"struct dfa *OO_base[] = {\n");
	for(s=0;s<=higheststate;s++) {
		fprintf(ofile,"\t/* %4d: ",s);
		outmnems(patterns[s]);
		fprintf(ofile,"*/\t");
		if(base[s]==EMPTY)
			fprintf(ofile,"0,\n");
		else
			fprintf(ofile,"&OO_checknext[%4d],\n", base[s]);
	}
	fprintf(ofile,"};\n\n");
	fprintf(ofile,"struct dodefault OO_default[] = {\n");
	for(s=0;s<=higheststate;s++) {
		fprintf(ofile,"\t/* %4d: ",s);
		outmnems(patterns[s]);
		fprintf(ofile,"*/\t");
		findfail(s,&nout,&ncpy,&ngto);
		fprintf(ofile,"{%4d,%4d},\n", nout,ngto);
	}
	fprintf(ofile,"};\n\n");
}

PRIVATE
outmnems(l)
	struct mnems l;
{
	int i;
	for(i=1;i<=l.m_len;i++) 
		fprintf(ofile,"%s ",l.m_elems[i-1]->op_code->id_text);
}

PRIVATE int
sametest(s1,s2,e1,e2)
	int s1,s2;
	struct exp_node *e1,*e2;
{
	/* return 1 if tests are identical */
	if(e1) {
		if(!e2) return 0;
		if(e1->node_type!=e2->node_type) return 0;
		switch(e1->node_type) {
		case LOGAND:
		case LOGOR:
		case BITAND:
		case BITOR:
		case XOR:
		case MINUS:
		case PLUS:
		case TIMES:
		case DIV:
		case MOD:
		case EQ:
		case NE:
		case LT:
		case LE:
		case GT:
		case GE:
		case LSHIFT:
		case RSHIFT:
		case COMMA:
		case SAMESIGN:
		case SFIT:
		case UFIT:
		case ROTATE:
		case SAMEEXT:
		case SAMENAM:
			return (sametest(s1,s2,e1->exp_left,e2->exp_left) &&
				sametest(s1,s2,e1->exp_right,e2->exp_right));
		case NOT:
		case COMP:
		case UPLUS:
		case UMINUS:
			return sametest(s1,s2,e1->exp_left,e2->exp_left);
		case DEFINED:
		case UNDEFINED:
		case INT:
			return (e1->leaf_val == e2->leaf_val);
		case PATARG:
			 /* depends on pattern !! */
			if (e1->leaf_val != e2->leaf_val) return 0;
			return (patterns[s1].m_elems[e1->leaf_val-1]->
				   op_code->id_argfmt
			     == patterns[s2].m_elems[e2->leaf_val-1]->
				   op_code->id_argfmt);
		case PSIZE:
		case WSIZE:
		case DWSIZE:
			return 1;

		}
		/*NOTREACHED*/
	}
	else return (e2==0);
}

PRIVATE int
samerepl(s1,s2,r1,r2)
	int s1,s2;
	struct mnems r1,r2;
{
	/* return 1 if replacements are identical */
	register int i;
	register struct mnem_elem *m1,*m2;
	if (r1.m_len != r2.m_len) return 0; /* different length */
	for(i=0;i<r1.m_len;i++) {
		m1=r1.m_elems[i];
		m2=r2.m_elems[i];
		if(m1->op_code!=m2->op_code) return 0;
		if(!sametest(s1,s2,m1->arg,m2->arg)) return 0;
	}
	return 1;
}

PRIVATE int
samecode(s1,s2)
	int s1,s2;
{
	/* return 1 if replacement code of state s1 and s2 are identical */
	register struct action *a1,*a2;
	if (patterns[s1].m_len != patterns[s2].m_len) return 0;
	a1 = actions[s1];
	a2 = actions[s2];
	while(a1) {
		if(!a2) return 0; /* a2 is shorter */
		if(!samerepl(s1,s2,a1->replacement,a2->replacement)) return 0;
		if(!sametest(s1,s2,a1->test,a2->test)) return 0;
		a1 = a1->next;
		a2 = a2->next;
	}
	if(a2) return 0; /* a2 is longer */
	return 1;
}

PRIVATE
outdotrans()
{
	register int s,t;
	struct action *a;
	int seennontested;
	int *farray;
	fprintf(ofile,"#include \"nopt.h\"\n\n");
	/* keep track of which procedure used for each state */
	farray = (int *)Malloc((unsigned)(higheststate+1)*sizeof(int));
	for(s=0;s<=higheststate;s++) farray[s] = EMPTY;
	/* output the functions avoiding duplicates */
	for(s=0;s<=higheststate;s++) {
		if(actions[s]!=(struct action *)NULL) {
			/* first look for a previous identical function */
			for(t=0;t<s;t++) {
				if(actions[t]!=(struct action *)NULL &&
				   samecode(s,t)) {
					   /* use state 't' instead */
					   farray[s]=t;
					   goto next_func;
				   }
			}
			/* no identical function so make new one */
			farray[s] = s;
			fprintf(ofile,"\nstatic do%dtrans() {\n",s);
			fprintf(ofile,"\tregister p_instr patt = OO_patternqueue;\n");
			fprintf(ofile,"\t/* ");
			outmnems(patterns[s]);
			fprintf(ofile," */\n");
			seennontested=0;
			for(a=actions[s];a!=(struct action *)NULL;a=a->next) {
				if(a->test!=(struct exp_node *)NULL) {
					fprintf(ofile,"\tif(");
					outexp(a->test,s);
					fprintf(ofile,") {\n");
					outoneaction(s,a);
					fprintf(ofile,"\t\treturn;\n");
					fprintf(ofile,"\t}\n");
				}
				else {
					if(seennontested) {
						fprintf(stderr,"parser: more than one untested action on state %d\n",s);
						nerrors++;
					}
					seennontested++;
					outoneaction(s,a);
				}
			}
			fprintf(ofile,"}\n");
		}
	next_func:
		continue;
	}
	/* output the array itself */
	fprintf(ofile,"\n\nint (*OO_ftrans[])()=\n{\n");
	for(s=0;s<=higheststate;s++) {
		if(farray[s]!=EMPTY)
			fprintf(ofile,"\tdo%dtrans,\n",farray[s]);
		else
			fprintf(ofile,"\t0,\n");
	}
	fprintf(ofile,"};\n");
}

PRIVATE
outoneaction(s,a)
	int s;
	struct action *a;
{
	fprintf(ofile,"\t\t/* -> ");
	outmnems(a->replacement);
	fprintf(ofile," */\n");
	fprintf(ofile,"#ifdef STATS\n");
	fprintf(ofile,"\t\tif(OO_wrstats) fprintf(stderr,\"%d\\n\");\n",a->linenum);
	fprintf(ofile,"#endif\n");
	outrepl(s,a->replacement);
	findworst(patterns[s],a->replacement);
}

PRIVATE
outrepl(state,repl)
	int state;
	struct mnems repl;
{
	/*
	/* Contruct <repl>=r1 r2 ... rn and put on output queue.
	*/
	int n = repl.m_len;
	int i;
	for(i=1;i<=n;i++) {
		struct mnem_elem *ri = repl.m_elems[i-1];
		char *mnem = ri->op_code->id_text;
		switch(ri->op_code->id_argfmt) {
		case NOARG:
			fprintf(ofile,"\t\tEM_Rop(op_%s);\n",mnem);
			break;
		case CST:
			fprintf(ofile,"\t\tEM_Rcst(op_%s,",mnem);
			fprintf(ofile,"(arith)");
			outexp(ri->arg,state);
			fprintf(ofile,");\n");
			break;
		case CSTOPT:
			if(ri->arg) {
				fprintf(ofile,"\t\tEM_Rcst(op_%s,",mnem);
				fprintf(ofile,"(arith)");
				outexp(ri->arg,state);
			}
			else {
				fprintf(ofile,"\t\tEM_Rnarg(op_%s);\n",mnem);
			}
			fprintf(ofile,");\n");
			break;
		case LAB:
			fprintf(ofile,"\t\tEM_Rilb(op_%s,",mnem);
			outexp(ri->arg,state);
			fprintf(ofile,");\n");
			break;
		case DEFILB:
			fprintf(ofile,"\t\tEM_Rdefilb(op_%s,",mnem);
			outexp(ri->arg,state);
			fprintf(ofile,");\n");
			break;
		case PNAM:
			fprintf(ofile,"\t\tEM_Rpro(op_%s,",mnem);
			outexp(ri->arg,state);
			fprintf(ofile,");\n");
			break;
		case EXT:
			fprintf(ofile,"\t\tOO_mkext(GETNXTREPL(), op_%s,",mnem);
			outexp(ri->arg,state);
			fprintf(ofile,");\n");
			break;
		}
	}
}

PRIVATE
outexp(e,state)
	struct exp_node *e;
	int state;
{
	switch(e->node_type) {
	case LOGAND:
	case LOGOR:
	case BITAND:
	case BITOR:
	case XOR:
	case MINUS:
	case PLUS:
	case TIMES:
	case DIV:
	case MOD:
	case EQ:
	case NE:
	case LT:
	case LE:
	case GT:
	case GE:
	case LSHIFT:
	case RSHIFT:
		fprintf(ofile,"(");
		outexp(e->exp_left,state);
		outop(e->node_type);
		outexp(e->exp_right,state);
		fprintf(ofile,")");
		break;
	case NOT:
	case COMP:
	case UPLUS:
	case UMINUS:
		fprintf(ofile,"(");
		outop(e->node_type);
		outexp(e->exp_left,state);
		fprintf(ofile,")");
		break;
	case DEFINED:
		fprintf(ofile,"DEFINED(patt[%d])",e->leaf_val-1);
		break;
	case UNDEFINED:
		fprintf(ofile,"!DEFINED(patt[%d])",e->leaf_val-1);
		break;
	case COMMA:
		outext(e->exp_left);
		fprintf(ofile,",");
		fprintf(ofile,"(arith)");
		outexp(e->exp_right,state);
		break;
	case SAMESIGN:
	case SFIT:
	case UFIT:
	case ROTATE:
		outop(e->node_type);
		fprintf(ofile,"(arith)");
		outexp(e->exp_left,state);
		fprintf(ofile,",");
		fprintf(ofile,"(arith)");
		outexp(e->exp_right,state);
		fprintf(ofile,")");
		break;
	case SAMEEXT:
	case SAMENAM:
		outop(e->node_type);
		outext(e->exp_left);
		fprintf(ofile,",");
		outext(e->exp_right);
		fprintf(ofile,")");
		break;
	case PATARG:
		switch(patterns[state].m_elems[e->leaf_val-1]->op_code->id_argfmt) {
		case NOARG:
			fprintf(stderr,"error: mnem %d has no argument\n",e->leaf_val);
			nerrors++;
			break;
		case CST:
		case CSTOPT:
			fprintf(ofile,"CST(patt[%d])",e->leaf_val-1);
			break;
		case LAB:
			fprintf(ofile,"LAB(patt[%d])",e->leaf_val-1);
			break;
		case DEFILB:
			fprintf(ofile,"DEFILB(patt[%d])",e->leaf_val-1);
			break;
		case PNAM:
			fprintf(ofile,"PNAM(patt[%d])",e->leaf_val-1);
			break;
		case EXT:
			fprintf(ofile,"OO_offset(patt+%d)",e->leaf_val-1);
			break;
		}
		break;
	case PSIZE:
		fprintf(ofile,"OO_PSIZE"); break;
	case WSIZE:
		fprintf(ofile,"OO_WSIZE"); break;
	case DWSIZE:
		fprintf(ofile,"OO_DWSIZE"); break;
	case INT:
		fprintf(ofile,"%d",e->leaf_val); break;
	}
}

PRIVATE
outext(e)
	struct exp_node *e;
{
	if(e->node_type!=PATARG) {
		fprintf(stderr,"Internal error in outext of parser\n");
		nerrors++;
	}
	fprintf(ofile,"patt+%d",e->leaf_val-1);
}

PRIVATE
outop(op)
	int op;
{
	switch(op) {
	case LOGAND:	fprintf(ofile,"&&");	break;
	case LOGOR:	fprintf(ofile,"||");	break;
	case BITAND:	fprintf(ofile,"&");	break;
	case BITOR:	fprintf(ofile,"|");	break;
	case XOR:	fprintf(ofile,"^");	break;
	case MINUS:	fprintf(ofile,"-");	break;
	case PLUS:	fprintf(ofile,"+");	break;
	case TIMES:	fprintf(ofile,"*");	break;
	case DIV:	fprintf(ofile,"/");	break;
	case MOD:	fprintf(ofile,"%%");	break;
	case EQ:	fprintf(ofile,"==");	break;
	case NE:	fprintf(ofile,"!=");	break;
	case LT:	fprintf(ofile,"<");	break;
	case LE:	fprintf(ofile,"<=");	break;
	case GT:	fprintf(ofile,">");	break;
	case GE:	fprintf(ofile,">=");	break;
	case LSHIFT:	fprintf(ofile,"<<");	break;
	case RSHIFT:	fprintf(ofile,">>");	break;
	case NOT:	fprintf(ofile,"!");	break;
	case COMP:	fprintf(ofile,"~");	break;
	case UPLUS:	fprintf(ofile,"+");	break;
	case UMINUS:	fprintf(ofile,"-");	break;
	case SAMESIGN:	fprintf(ofile,"OO_signsame(");	break;
	case SFIT:	fprintf(ofile,"OO_sfit(");	break;
	case UFIT:	fprintf(ofile,"OO_ufit(");	break;
	case ROTATE:	fprintf(ofile,"OO_rotate(");	break;
	case SAMEEXT:	fprintf(ofile,"OO_extsame(");	break;
	case SAMENAM:	fprintf(ofile,"OO_namsame(");	break;
	}
}