ack/lang/fortran/comp/proc.c

/****************************************************************
Copyright 1990 by AT&T Bell Laboratories and Bellcore.

Permission to use, copy, modify, and distribute this software
and its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the names of AT&T Bell Laboratories or
Bellcore or any of their entities not be used in advertising or
publicity pertaining to distribution of the software without
specific, written prior permission.

AT&T and Bellcore disclaim all warranties with regard to this
software, including all implied warranties of merchantability
and fitness.  In no event shall AT&T or Bellcore be liable for
any special, indirect or consequential damages or any damages
whatsoever resulting from loss of use, data or profits, whether
in an action of contract, negligence or other tortious action,
arising out of or in connection with the use or performance of
this software.
****************************************************************/

#include "defs.h"
#include "names.h"
#include "output.h"
#include "p1defs.h"

#define EXNULL (union Expression *)0

LOCAL dobss(), docomleng(), docommon(), doentry(),
	epicode(), nextarg(), retval();

static char Blank[] = BLANKCOMMON;

 static char *postfix[] = { "h", "i", "r", "d", "c", "z", "i" };

 chainp new_procs;
 int prev_proc, proc_argchanges, proc_protochanges;

 void
changedtype(q)
 Namep q;
{
	char buf[200];
	int qtype, type1;
	register Extsym *e;
	Argtypes *at;

	if (q->vtypewarned)
		return;
	q->vtypewarned = 1;
	qtype = q->vtype;
	e = &extsymtab[q->vardesc.varno];
	if (!(at = e->arginfo)) {
		if (!e->exused)
			return;
		}
	else if (at->changes & 2 && qtype != TYUNKNOWN)
		proc_protochanges++;
	type1 = e->extype;
	if (type1 == TYUNKNOWN)
		return;
	if (qtype == TYUNKNOWN)
		/* e.g.,
			subroutine foo
			end
			external foo
			call goo(foo)
			end
		*/
		return;
	sprintf(buf, "%.90s: inconsistent declarations:\n\
	here %s%s, previously %s%s.", q->fvarname, ftn_types[qtype],
		qtype == TYSUBR ? "" : " function",
		ftn_types[type1], type1 == TYSUBR ? "" : " function");
	warn(buf);
	}

 void
unamstring(q, s)
 register Addrp q;
 register char *s;
{
	register int k;
	register char *t;

	k = strlen(s);
	if (k < IDENT_LEN) {
		q->uname_tag = UNAM_IDENT;
		t = q->user.ident;
		}
	else {
		q->uname_tag = UNAM_CHARP;
		q->user.Charp = t = mem(k+1, 0);
		}
	strcpy(t, s);
	}

 static void
fix_entry_returns()	/* for multiple entry points */
{
	Addrp a;
	int i;
	struct Entrypoint *e;
	Namep np;

	e = entries = (struct Entrypoint *)revchain((chainp)entries);
	allargs = revchain(allargs);
	if (!multitype)
		return;

	/* TYLOGICAL should have been turned into TYLONG or TYSHORT by now */

	for(i = TYSHORT; i <= TYLOGICAL; i++)
		if (a = xretslot[i])
			sprintf(a->user.ident, "(*ret_val).%s",
				postfix[i-TYSHORT]);

	do {
		np = e->enamep;
		switch(np->vtype) {
			case TYSHORT:
			case TYLONG:
			case TYREAL:
			case TYDREAL:
			case TYCOMPLEX:
			case TYDCOMPLEX:
			case TYLOGICAL:
				np->vstg = STGARG;
			}
		}
		while(e = e->entnextp);
	}

 static void
putentries(outfile)	/* put out wrappers for multiple entries */
 FILE *outfile;
{
	char base[IDENT_LEN];
	struct Entrypoint *e;
	Namep *A, *Ae, *Ae1, **Alp, *a, **a1, np;
	chainp args, lengths, length_comp();
	void listargs(), list_arg_types();
	int i, k, mt, nL, type;
	extern char *dfltarg[], **dfltproc;

	nL = (nallargs + nallchargs) * sizeof(Namep *);
	A = (Namep *)ckalloc(nL + nallargs*sizeof(Namep **));
	Ae = A + nallargs;
	Alp = (Namep **)(Ae1 = Ae + nallchargs);
	i = k = 0;
	for(a1 = Alp, args = allargs; args; a1++, args = args->nextp) {
		np = (Namep)args->datap;
		if (np->vtype == TYCHAR && np->vclass != CLPROC)
			*a1 = &Ae[i++];
		}

	e = entries;
	mt = multitype;
	multitype = 0;
	sprintf(base, "%s0_", e->enamep->cvarname);
	do {
		np = e->enamep;
		lengths = length_comp(e, 0);
		proctype = type = np->vtype;
		if (protofile)
			protowrite(protofile, type, np->cvarname, e, lengths);
		nice_printf(outfile, "\n%s ", c_type_decl(type, 1));
		nice_printf(outfile, "%s", np->cvarname);
		if (!Ansi) {
			listargs(outfile, e, 0, lengths);
			nice_printf(outfile, "\n");
			}
	    	list_arg_types(outfile, e, lengths, 0, "\n");
		nice_printf(outfile, "{\n");
		frchain(&lengths);
		next_tab(outfile);
		if (mt)
			nice_printf(outfile,
				"Multitype ret_val;\n%s(%d, &ret_val",
				base, k); /*)*/
		else if (ISCOMPLEX(type))
			nice_printf(outfile, "%s(%d,%s", base, k,
				xretslot[type]->user.ident); /*)*/
		else if (type == TYCHAR)
			nice_printf(outfile,
				"%s(%d, ret_val, ret_val_len", base, k); /*)*/
		else
			nice_printf(outfile, "return %s(%d", base, k); /*)*/
		k++;
		memset((char *)A, 0, nL);
		for(args = e->arglist; args; args = args->nextp) {
			np = (Namep)args->datap;
			A[np->argno] = np;
			if (np->vtype == TYCHAR && np->vclass != CLPROC)
				*Alp[np->argno] = np;
			}
		args = allargs;
		for(a = A; a < Ae; a++, args = args->nextp)
			nice_printf(outfile, ", %s", (np = *a)
				? np->cvarname
				: ((Namep)args->datap)->vclass == CLPROC
				? dfltproc[((Namep)args->datap)->vtype]
				: dfltarg[((Namep)args->datap)->vtype]);
		for(; a < Ae1; a++)
			if (np = *a)
				nice_printf(outfile, ", %s_len", np->fvarname);
			else
				nice_printf(outfile, ", (ftnint)0");
		nice_printf(outfile, /*(*/ ");\n");
		if (mt) {
			if (type == TYCOMPLEX)
				nice_printf(outfile,
		    "r_v->r = ret_val.c.r; r_v->i = ret_val.c.i;\nreturn 0;\n");
			else if (type == TYDCOMPLEX)
				nice_printf(outfile,
		    "r_v->r = ret_val.z.r; r_v->i = ret_val.z.i;\nreturn 0;\n");
			else nice_printf(outfile, "return ret_val.%s;\n",
				postfix[type-TYSHORT]);
			}
		else if (ONEOF(type, M(TYCHAR)|M(TYCOMPLEX)|M(TYDCOMPLEX)))
			nice_printf(outfile, "return 0;\n");
		nice_printf(outfile, "}\n");
		prev_tab(outfile);
		}
		while(e = e->entnextp);
	free((char *)A);
	}

 static void
entry_goto(outfile)
 FILEP outfile;
{
	struct Entrypoint *e = entries;
	int k = 0;

	nice_printf(outfile, "switch(n__) {\n");
	next_tab(outfile);
	while(e = e->entnextp)
		nice_printf(outfile, "case %d: goto %s;\n", ++k,
			user_label((long)(extsymtab - e->entryname - 1)));
	nice_printf(outfile, "}\n\n");
	prev_tab(outfile);
	}

/* start a new procedure */

newproc()
{
	if(parstate != OUTSIDE)
	{
		execerr("missing end statement", CNULL);
		endproc();
	}

	parstate = INSIDE;
	procclass = CLMAIN;	/* default */
}

 static void
zap_changes()
{
	register chainp cp;
	register Argtypes *at;

	/* arrange to get correct count of prototypes that would
	   change by running f2c again */

	if (prev_proc && proc_argchanges)
		proc_protochanges++;
	prev_proc = proc_argchanges = 0;
	for(cp = new_procs; cp; cp = cp->nextp)
		if (at = ((Namep)cp->datap)->arginfo)
			at->changes &= ~1;
	frchain(&new_procs);
	}

/* end of procedure. generate variables, epilogs, and prologs */

endproc()
{
	struct Labelblock *lp;
	Extsym *ext;

	if(parstate < INDATA)
		enddcl();
	if(ctlstack >= ctls)
		err("DO loop or BLOCK IF not closed");
	for(lp = labeltab ; lp < labtabend ; ++lp)
		if(lp->stateno!=0 && lp->labdefined==NO)
			errstr("missing statement label %s",
				convic(lp->stateno) );

/* Save copies of the common variables in extptr -> allextp */

	for (ext = extsymtab; ext < nextext; ext++)
		if (ext -> extstg == STGCOMMON && ext -> extp) {
			extern int usedefsforcommon;

/* Write out the abbreviations for common block reference */

			copy_data (ext -> extp);
			if (usedefsforcommon) {
				wr_abbrevs (c_file, 1, ext -> extp);
				ext -> used_here = 1;
				}
			else
				ext -> extp = CHNULL;

			}

	if (nentry > 1)
		fix_entry_returns();
	epicode();
	donmlist();
	dobss();
	start_formatting ();
	if (nentry > 1)
		putentries(c_file);

	zap_changes();
	procinit();	/* clean up for next procedure */
}



/* End of declaration section of procedure.  Allocate storage. */

enddcl()
{
	register struct Entrypoint *ep;
	struct Entrypoint *ep0;
	extern void freetemps();
	chainp cp;
	extern char *err_proc;
	static char comblks[] = "common blocks";

	err_proc = comblks;
	docommon();

/* Now the hash table entries for fields of common blocks have STGCOMMON,
   vdcldone, voffset, and varno.  And the common blocks themselves have
   their full sizes in extleng. */

	err_proc = "equivalences";
	doequiv();

	err_proc = comblks;
	docomleng();

/* This implies that entry points in the declarations are buffered in
   entries   but not written out */

	err_proc = "entries";
	if (ep = ep0 = (struct Entrypoint *)revchain((chainp)entries)) {
		/* entries could be 0 in case of an error */
		do doentry(ep);
			while(ep = ep->entnextp);
		entries = (struct Entrypoint *)revchain((chainp)ep0);
		}

	err_proc = 0;
	parstate = INEXEC;
	p1put(P1_PROCODE);
	freetemps();
	if (earlylabs) {
		for(cp = earlylabs = revchain(earlylabs); cp; cp = cp->nextp)
			p1_label((long)cp->datap);
		frchain(&earlylabs);
		}
}

/* ROUTINES CALLED WHEN ENCOUNTERING ENTRY POINTS */

/* Main program or Block data */

startproc(progname, class)
Extsym * progname;
int class;
{
	register struct Entrypoint *p;

	p = ALLOC(Entrypoint);
	if(class == CLMAIN) {
		puthead(CNULL, CLMAIN);
		if (progname)
		    strcpy (main_alias, progname->cextname);
	} else
		puthead(CNULL, CLBLOCK);
	if(class == CLMAIN)
		newentry( mkname(" MAIN"), 0 )->extinit = 1;
	p->entryname = progname;
	entries = p;

	procclass = class;
	fprintf(diagfile, "   %s", (class==CLMAIN ? "MAIN" : "BLOCK DATA") );
	if(progname) {
		fprintf(diagfile, " %s", progname->fextname);
		procname = progname->cextname;
		}
	fprintf(diagfile, ":\n");
	fflush(diagfile);
}

/* subroutine or function statement */

Extsym *newentry(v, substmsg)
 register Namep v;
 int substmsg;
{
	register Extsym *p;
	char buf[128], badname[64];
	static int nbad = 0;
	static char already[] = "external name already used";

	p = mkext(v->fvarname, addunder(v->cvarname));

	if(p->extinit || ! ONEOF(p->extstg, M(STGUNKNOWN)|M(STGEXT)) )
	{
		sprintf(badname, "%s_bad%d", v->fvarname, ++nbad);
		if (substmsg) {
			sprintf(buf,"%s\n\tsubstituting \"%s\"",
				already, badname);
			dclerr(buf, v);
			}
		else
			dclerr(already, v);
		p = mkext(v->fvarname, badname);
	}
	v->vstg = STGAUTO;
	v->vprocclass = PTHISPROC;
	v->vclass = CLPROC;
	if (p->extstg == STGEXT)
		prev_proc = 1;
	else
		p->extstg = STGEXT;
	p->extinit = YES;
	v->vardesc.varno = p - extsymtab;
	return(p);
}


entrypt(class, type, length, entry, args)
int class, type;
ftnint length;
Extsym *entry;
chainp args;
{
	register Namep q;
	register struct Entrypoint *p;
	extern int types3[];

	if(class != CLENTRY)
		puthead( procname = entry->cextname, class);
	else
		fprintf(diagfile, "       entry ");
	fprintf(diagfile, "   %s:\n", entry->fextname);
	fflush(diagfile);
	q = mkname(entry->fextname);
	if (type == TYSUBR)
		q->vstg = STGEXT;

	type = lengtype(type, length);
	if(class == CLPROC)
	{
		procclass = CLPROC;
		proctype = type;
		procleng = type == TYCHAR ? length : 0;
	}

	p = ALLOC(Entrypoint);

	p->entnextp = entries;
	entries = p;

	p->entryname = entry;
	p->arglist = revchain(args);
	p->enamep = q;

	if(class == CLENTRY)
	{
		class = CLPROC;
		if(proctype == TYSUBR)
			type = TYSUBR;
	}

	q->vclass = class;
	q->vprocclass = 0;
	settype(q, type, length);
	q->vprocclass = PTHISPROC;
	/* hold all initial entry points till end of declarations */
	if(parstate >= INDATA)
		doentry(p);
}

/* generate epilogs */

/* epicode -- write out the proper function return mechanism at the end of
   the procedure declaration.  Handles multiple return value types, as
   well as cooercion into the proper value */

LOCAL epicode()
{
	extern int lastwasbranch;

	if(procclass==CLPROC)
	{
		if(proctype==TYSUBR)
		{

/* Return a zero only when the alternate return mechanism has been
   specified in the function header */

			if (substars && lastwasbranch == NO)
			    p1_subr_ret (ICON(0));
		}
		else if (!multitype && lastwasbranch == NO)
			retval(proctype);
	}
	lastwasbranch = NO;
}


/* generate code to return value of type  t */

LOCAL retval(t)
register int t;
{
	register Addrp p;

	switch(t)
	{
	case TYCHAR:
	case TYCOMPLEX:
	case TYDCOMPLEX:
		break;

	case TYLOGICAL:
		t = tylogical;
	case TYADDR:
	case TYSHORT:
	case TYLONG:
	case TYREAL:
	case TYDREAL:
		p = (Addrp) cpexpr((expptr)retslot);
		p->vtype = t;
		p1_subr_ret (mkconv (t, fixtype((expptr)p)));
		break;

	default:
		badtype("retval", t);
	}
}


/* Do parameter adjustments */

procode(outfile)
FILE *outfile;
{
	prolog(outfile, allargs);

	if (nentry > 1)
		entry_goto(outfile);
	}

/* Finish bound computations now that all variables are declared.
 * This used to be in setbound(), but under -u the following incurred
 * an erroneous error message:
 *	subroutine foo(x,n)
 *	real x(n)
 *	integer n
 */

 static void
dim_finish(v)
 Namep v;
{
	register struct Dimblock *p;
	register expptr q;
	register int i, nd;
	extern expptr make_int_expr();

	p = v->vdim;
	v->vdimfinish = 0;
	nd = p->ndim;
	doin_setbound = 1;
	for(i = 0; i < nd; i++)
		if (q = p->dims[i].dimexpr)
			p->dims[i].dimexpr = make_int_expr(putx(fixtype(q)));
	if (q = p->basexpr)
		p->basexpr = make_int_expr(putx(fixtype(q)));
	doin_setbound = 0;
	}

 static void
duparg(q)
 Namep q;
{ errstr("duplicate argument %.80s", q->fvarname); }

/*
   manipulate argument lists (allocate argument slot positions)
 * keep track of return types and labels
 */

LOCAL doentry(ep)
struct Entrypoint *ep;
{
	register int type;
	register Namep np;
	chainp p, p1;
	register Namep q;
	Addrp mkarg(), rs;
	int it, k;
	extern char dflttype[26];
	Extsym *entryname = ep->entryname;

	if (++nentry > 1)
		p1_label((long)(extsymtab - entryname - 1));

/* The main program isn't allowed to have parameters, so any given
   parameters are ignored */

	if(procclass == CLMAIN || procclass == CLBLOCK)
		return;

/* So now we're working with something other than CLMAIN or CLBLOCK.
   Determine the type of its return value. */

	impldcl( np = mkname(entryname->fextname) );
	type = np->vtype;
	proc_argchanges = prev_proc && type != entryname->extype;
	entryname->extseen = 1;
	if(proctype == TYUNKNOWN)
		if( (proctype = type) == TYCHAR)
			procleng = np->vleng ? np->vleng->constblock.Const.ci
					     : (ftnint) (-1);

	if(proctype == TYCHAR)
	{
		if(type != TYCHAR)
			err("noncharacter entry of character function");

/* Functions returning type   char   can only have multiple entries if all
   entries return the same length */

		else if( (np->vleng ? np->vleng->constblock.Const.ci :
		    (ftnint) (-1)) != procleng)
			err("mismatched character entry lengths");
	}
	else if(type == TYCHAR)
		err("character entry of noncharacter function");
	else if(type != proctype)
		multitype = YES;
	if(rtvlabel[type] == 0)
		rtvlabel[type] = newlabel();
	ep->typelabel = rtvlabel[type];

	if(type == TYCHAR)
	{
		if(chslot < 0)
		{
			chslot = nextarg(TYADDR);
			chlgslot = nextarg(TYLENG);
		}
		np->vstg = STGARG;

/* Put a new argument in the function, one which will hold the result of
   a character function.  This will have to be named sometime, probably in
   mkarg(). */

		if(procleng < 0) {
			np->vleng = (expptr) mkarg(TYLENG, chlgslot);
			np->vleng->addrblock.uname_tag = UNAM_IDENT;
			strcpy (np -> vleng -> addrblock.user.ident,
				new_func_length());
			}
		if (!xretslot[TYCHAR]) {
			xretslot[TYCHAR] = rs =
				autovar(0, type, ISCONST(np->vleng)
					? np->vleng : ICON(0), "");
			strcpy(rs->user.ident, "ret_val");
			}
	}

/* Handle a   complex   return type -- declare a new parameter (pointer to
   a complex value) */

	else if( ISCOMPLEX(type) ) {
		if (!xretslot[type])
			xretslot[type] =
				autovar(0, type, EXNULL, " ret_val");
				/* the blank is for use in out_addr */
		np->vstg = STGARG;
		if(cxslot < 0)
			cxslot = nextarg(TYADDR);
		}
	else if (type != TYSUBR) {
		if (type == TYUNKNOWN) {
			dclerr("untyped function", np);
			proctype = type = np->vtype =
				dflttype[letter(np->fvarname[0])];
			}
		if (!xretslot[type])
			xretslot[type] = retslot =
				autovar(1, type, EXNULL, " ret_val");
				/* the blank is for use in out_addr */
		np->vstg = STGAUTO;
		}

	for(p = ep->arglist ; p ; p = p->nextp)
		if(! (( q = (Namep) (p->datap) )->vknownarg) ) {
			q->vknownarg = 1;
			q->vardesc.varno = nextarg(TYADDR);
			allargs = mkchain((char *)q, allargs);
			q->argno = nallargs++;
			}
		else if (nentry == 1)
			duparg(q);
		else for(p1 = ep->arglist ; p1 != p; p1 = p1->nextp)
			if ((Namep)p1->datap == q)
				duparg(q);

	k = 0;
	for(p = ep->arglist ; p ; p = p->nextp) {
		if(! (( q = (Namep) (p->datap) )->vdcldone) )
			{
			impldcl(q);
			q->vdcldone = YES;
			if(q->vtype == TYCHAR)
				{

/* If we don't know the length of a char*(*) (i.e. a string), we must add
   in this additional length argument. */

				++nallchargs;
				if (q->vclass == CLPROC)
					nallchargs--;
				else if (q->vleng == NULL) {
					/* character*(*) */
					q->vleng = (expptr)
					    mkarg(TYLENG, nextarg(TYLENG) );
					unamstring((Addrp)q->vleng,
						new_arg_length(q));
					}
				}
			}
		if (q->vdimfinish)
			dim_finish(q);
		if (q->vtype == TYCHAR && q->vclass != CLPROC)
			k++;
		}

	if (entryname->extype != type)
		changedtype(np);

	/* save information for checking consistency of arg lists */

	it = infertypes;
	if (entryname->exproto)
		infertypes = 1;
	save_argtypes(ep->arglist, &entryname->arginfo, &np->arginfo,
			0, np->fvarname, STGEXT, k, np->vtype, 0);
	infertypes = it;
}



LOCAL nextarg(type)
int type;
{
	int k;
	k = lastargslot;
	lastargslot += typesize[type];
	return(k);
}

 LOCAL
dim_check(q)
 Namep q;
{
	register struct Dimblock *vdim = q->vdim;

	if(!vdim->nelt || !ISICON(vdim->nelt))
		dclerr("adjustable dimension on non-argument", q);
	else if (vdim->nelt->constblock.Const.ci <= 0)
		dclerr("nonpositive dimension", q);
	}

LOCAL dobss()
{
	register struct Hashentry *p;
	register Namep q;
	int qstg, qclass, qtype;
	Extsym *e;

	for(p = hashtab ; p<lasthash ; ++p)
		if(q = p->varp)
		{
			qstg = q->vstg;
			qtype = q->vtype;
			qclass = q->vclass;

			if( (qclass==CLUNKNOWN && qstg!=STGARG) ||
			    (qclass==CLVAR && qstg==STGUNKNOWN) ) {
				if (!(q->vis_assigned | q->vimpldovar))
					warn1("local variable %s never used",
						q->fvarname);
				}
			else if(qclass==CLVAR && qstg==STGBSS)
			{ ; }

/* Give external procedures the proper storage class */

			else if(qclass==CLPROC && q->vprocclass==PEXTERNAL
					&& qstg!=STGARG) {
				e = mkext(q->fvarname,addunder(q->cvarname));
				e->extstg = STGEXT;
				q->vardesc.varno = e - extsymtab;
				if (e->extype != qtype)
					changedtype(q);
				}
			if(qclass==CLVAR) {
			    if (qstg != STGARG && q->vdim)
				dim_check(q);
			} /* if qclass == CLVAR */
		}

}



donmlist()
{
	register struct Hashentry *p;
	register Namep q;

	for(p=hashtab; p<lasthash; ++p)
		if( (q = p->varp) && q->vclass==CLNAMELIST)
			namelist(q);
}


/* iarrlen -- Returns the size of the array in bytes, or -1 */

ftnint iarrlen(q)
register Namep q;
{
	ftnint leng;

	leng = typesize[q->vtype];
	if(leng <= 0)
		return(-1);
	if(q->vdim)
		if( ISICON(q->vdim->nelt) )
			leng *= q->vdim->nelt->constblock.Const.ci;
		else	return(-1);
	if(q->vleng)
		if( ISICON(q->vleng) )
			leng *= q->vleng->constblock.Const.ci;
		else return(-1);
	return(leng);
}

namelist(np)
Namep np;
{
	register chainp q;
	register Namep v;
	int y;

	if (!np->visused)
		return;
	y = 0;

	for(q = np->varxptr.namelist ; q ; q = q->nextp)
	{
		vardcl( v = (Namep) (q->datap) );
		if( !ONEOF(v->vstg, MSKSTATIC) )
			dclerr("may not appear in namelist", v);
		else {
			v->vnamelist = 1;
			v->visused = 1;
			v->vsave = 1;
			y = 1;
			}
	np->visused = y;
	}
}

/* docommon -- called at the end of procedure declarations, before
   equivalences and the procedure body */

LOCAL docommon()
{
    register Extsym *extptr;
    register chainp q, q1;
    struct Dimblock *t;
    expptr neltp;
    register Namep comvar;
    ftnint size;
    int i, k, pref, type;
    extern int type_pref[];

    for(extptr = extsymtab ; extptr<nextext ; ++extptr)
	if (extptr->extstg == STGCOMMON && (q = extptr->extp)) {

/* If a common declaration also had a list of variables ... */

	    q = extptr->extp = revchain(q);
	    pref = 1;
	    for(k = TYCHAR; q ; q = q->nextp)
	    {
		comvar = (Namep) (q->datap);

		if(comvar->vdcldone == NO)
		    vardcl(comvar);
		type = comvar->vtype;
		if (pref < type_pref[type])
			pref = type_pref[k = type];
		if(extptr->extleng % typealign[type] != 0) {
		    dclerr("common alignment", comvar);
		    --nerr; /* don't give bad return code for this */
#if 0
		    extptr->extleng = roundup(extptr->extleng, typealign[type]);
#endif
		} /* if extptr -> extleng % */

/* Set the offset into the common block */

		comvar->voffset = extptr->extleng;
		comvar->vardesc.varno = extptr - extsymtab;
		if(type == TYCHAR)
		    size = comvar->vleng->constblock.Const.ci;
		else
		    size = typesize[type];
		if(t = comvar->vdim)
		    if( (neltp = t->nelt) && ISCONST(neltp) )
			size *= neltp->constblock.Const.ci;
		    else
			dclerr("adjustable array in common", comvar);

/* Adjust the length of the common block so far */

		extptr->extleng += size;
	    } /* for */

	    extptr->extype = k;

/* Determine curno and, if new, save this identifier chain */

	    q1 = extptr->extp;
	    for (q = extptr->allextp, i = 0; q; i++, q = q->nextp)
		if (struct_eq((chainp)q->datap, q1))
			break;
	    if (q)
		extptr->curno = extptr->maxno - i;
	    else {
		extptr->curno = ++extptr->maxno;
		extptr->allextp = mkchain((char *)extptr->extp,
						extptr->allextp);
		}
	} /* if extptr -> extstg == STGCOMMON */

/* Now the hash table entries have STGCOMMON, vdcldone, voffset, and
   varno.  And the common block itself has its full size in extleng. */

} /* docommon */


/* copy_data -- copy the Namep entries so they are available even after
   the hash table is empty */

copy_data (list)
chainp list;
{
    for (; list; list = list -> nextp) {
	Namep namep = ALLOC (Nameblock);
	int size, nd, i;
	struct Dimblock *dp;

	cpn(sizeof(struct Nameblock), list->datap, (char *)namep);
	namep->fvarname = strcpy(gmem(strlen(namep->fvarname)+1,0),
		namep->fvarname);
	namep->cvarname = strcmp(namep->fvarname, namep->cvarname)
		? strcpy(gmem(strlen(namep->cvarname)+1,0), namep->cvarname)
		: namep->fvarname;
	if (namep -> vleng)
	    namep -> vleng = (expptr) cpexpr (namep -> vleng);
	if (namep -> vdim) {
	    nd = namep -> vdim -> ndim;
	    size = sizeof(int) + (3 + 2 * nd) * sizeof (expptr);
	    dp = (struct Dimblock *) ckalloc (size);
	    cpn(size, (char *)namep->vdim, (char *)dp);
	    namep -> vdim = dp;
	    dp->nelt = (expptr)cpexpr(dp->nelt);
	    for (i = 0; i < nd; i++) {
		dp -> dims[i].dimsize = (expptr) cpexpr (dp -> dims[i].dimsize);
	    } /* for */
	} /* if */
	list -> datap = (char *) namep;
    } /* for */
} /* copy_data */



LOCAL docomleng()
{
	register Extsym *p;

	for(p = extsymtab ; p < nextext ; ++p)
		if(p->extstg == STGCOMMON)
		{
			if(p->maxleng!=0 && p->extleng!=0 && p->maxleng!=p->extleng
			    && strcmp(Blank, p->cextname) )
				warn1("incompatible lengths for common block %.60s",
				    p->fextname);
			if(p->maxleng < p->extleng)
				p->maxleng = p->extleng;
			p->extleng = 0;
		}
}


/* ROUTINES DEALING WITH AUTOMATIC AND TEMPORARY STORAGE */

frtemp(p)
Addrp p;
{
	/* put block on chain of temps to be reclaimed */
	holdtemps = mkchain((char *)p, holdtemps);
}

 void
freetemps()
{
	register chainp p, p1;
	register Addrp q;
	register int t;

	p1 = holdtemps;
	while(p = p1) {
		q = (Addrp)p->datap;
		t = q->vtype;
		if (t == TYCHAR && q->varleng != 0) {
			/* restore clobbered character string lengths */
			frexpr(q->vleng);
			q->vleng = ICON(q->varleng);
			}
		p1 = p->nextp;
		p->nextp = templist[t];
		templist[t] = p;
		}
	holdtemps = 0;
	}

/* allocate an automatic variable slot for each of   nelt   variables */

Addrp autovar(nelt0, t, lengp, name)
register int nelt0, t;
expptr lengp;
char *name;
{
	ftnint leng;
	register Addrp q;
	char *temp_name ();
	register int nelt = nelt0 > 0 ? nelt0 : 1;
	extern char *av_pfix[];

	if(t == TYCHAR)
		if( ISICON(lengp) )
			leng = lengp->constblock.Const.ci;
		else	{
			Fatal("automatic variable of nonconstant length");
		}
	else
		leng = typesize[t];

	q = ALLOC(Addrblock);
	q->tag = TADDR;
	q->vtype = t;
	if(t == TYCHAR)
	{
		q->vleng = ICON(leng);
		q->varleng = leng;
	}
	q->vstg = STGAUTO;
	q->ntempelt = nelt;
	q->isarray = (nelt > 1);
	q->memoffset = ICON(0);

	/* kludge for nls so we can have ret_val rather than ret_val_4 */
	if (*name == ' ')
		unamstring(q, name);
	else {
		q->uname_tag = UNAM_IDENT;
		temp_name(av_pfix[t], ++autonum[t], q->user.ident);
		}
	if (nelt0 > 0)
		declare_new_addr (q);
	return(q);
}


/* Returns a temporary of the appropriate type.  Will reuse existing
   temporaries when possible */

Addrp mktmpn(nelt, type, lengp)
int nelt;
register int type;
expptr lengp;
{
	ftnint leng;
	chainp p, oldp;
	register Addrp q;

	if(type==TYUNKNOWN || type==TYERROR)
		badtype("mktmpn", type);

	if(type==TYCHAR)
		if( ISICON(lengp) )
			leng = lengp->constblock.Const.ci;
		else	{
			err("adjustable length");
			return( (Addrp) errnode() );
		}
	else if (type > TYCHAR || type < TYADDR) {
		erri("mktmpn: unexpected type %d", type);
		exit(1);
		}
/*
 * if a temporary of appropriate shape is on the templist,
 * remove it from the list and return it
 */
	for(oldp=CHNULL, p=templist[type];  p  ;  oldp=p, p=p->nextp)
	{
		q = (Addrp) (p->datap);
		if(q->ntempelt==nelt &&
		    (type!=TYCHAR || q->vleng->constblock.Const.ci==leng) )
		{
			if(oldp)
				oldp->nextp = p->nextp;
			else
				templist[type] = p->nextp;
			free( (charptr) p);
			return(q);
		}
	}
	q = autovar(nelt, type, lengp, "");
	return(q);
}




/* mktmp -- create new local variable; call it something like   name
   lengp   is taken directly, not copied */

Addrp mktmp(type, lengp)
int type;
expptr lengp;
{
	Addrp rv;
	/* arrange for temporaries to be recycled */
	/* at the end of this statement... */
	rv = mktmpn(1,type,lengp);
	frtemp((Addrp)cpexpr((expptr)rv));
	return rv;
}

/* mktmp0 omits frtemp() */
Addrp mktmp0(type, lengp)
int type;
expptr lengp;
{
	Addrp rv;
	/* arrange for temporaries to be recycled */
	/* when this Addrp is freed */
	rv = mktmpn(1,type,lengp);
	rv->istemp = YES;
	return rv;
}

/* VARIOUS ROUTINES FOR PROCESSING DECLARATIONS */

/* comblock -- Declare a new common block.  Input parameters name the block;
   s   will be NULL if the block is unnamed */

Extsym *comblock(s)
 register char *s;
{
	Extsym *p;
	register char *t;
	register int c, i;
	char cbuf[256], *s0;

/* Give the unnamed common block a unique name */

	if(*s == 0)
		p = mkext(Blank,Blank);
	else {
		s0 = s;
		t = cbuf;
		for(i = 0; c = *t = *s++; t++)
			if (c == '_')
				i = 1;
		if (i)
			*t++ = '_';
		t[0] = '_';
		t[1] = 0;
		p = mkext(s0,cbuf);
		}
	if(p->extstg == STGUNKNOWN)
		p->extstg = STGCOMMON;
	else if(p->extstg != STGCOMMON)
	{
		errstr("%.68s cannot be a common block name", s);
		return(0);
	}

	return( p );
}


/* incomm -- add a new variable to a common declaration */

incomm(c, v)
Extsym *c;
Namep v;
{
	if (!c)
		return;
	if(v->vstg != STGUNKNOWN && !v->vimplstg)
		dclerr(v->vstg == STGARG
			? "dummy arguments cannot be in common"
			: "incompatible common declaration", v);
	else
	{
		v->vstg = STGCOMMON;
		c->extp = mkchain((char *)v, c->extp);
	}
}




/* settype -- set the type or storage class of a Namep object.  If
   v -> vstg == STGUNKNOWN && type < 0,   attempt to reset vstg to be
   -type.  This function will not change any earlier definitions in   v,
   in will only attempt to fill out more information give the other params */

settype(v, type, length)
register Namep  v;
register int type;
register ftnint length;
{
	int type1;

	if(type == TYUNKNOWN)
		return;

	if(type==TYSUBR && v->vtype!=TYUNKNOWN && v->vstg==STGARG)
	{
		v->vtype = TYSUBR;
		frexpr(v->vleng);
		v->vleng = 0;
		v->vimpltype = 0;
	}
	else if(type < 0)	/* storage class set */
	{
		if(v->vstg == STGUNKNOWN)
			v->vstg = - type;
		else if(v->vstg != -type)
			dclerr("incompatible storage declarations", v);
	}
	else if(v->vtype == TYUNKNOWN || v->vimpltype && v->vtype != type)
	{
		if( (v->vtype = lengtype(type, length))==TYCHAR )
			if (length>=0)
				v->vleng = ICON(length);
			else if (parstate >= INDATA)
				v->vleng = ICON(1);	/* avoid a memory fault */
		v->vimpltype = 0;

		if (v->vclass == CLPROC) {
			if (v->vstg == STGEXT
			 && (type1 = extsymtab[v->vardesc.varno].extype)
			 &&  type1 != v->vtype)
				changedtype(v);
			else if (v->vprocclass == PTHISPROC
					&& parstate >= INDATA
					&& !xretslot[type])
				xretslot[type] = autovar(ONEOF(type,
					MSKCOMPLEX|MSKCHAR) ? 0 : 1, type,
					v->vleng, " ret_val");
				/* not completely right, but enough to */
				/* avoid memory faults; we won't */
				/* emit any C as we have illegal Fortran */
			}
	}
	else if(v->vtype!=type) {
 incompat:
		dclerr("incompatible type declarations", v);
		}
	else if (type==TYCHAR)
		if (v->vleng && v->vleng->constblock.Const.ci != length)
			goto incompat;
		else if (parstate >= INDATA)
			v->vleng = ICON(1);	/* avoid a memory fault */
}





/* lengtype -- returns the proper compiler type, given input of Fortran
   type and length specifier */

lengtype(type, len)
register int type;
ftnint len;
{
	register int length = (int)len;
	switch(type)
	{
	case TYREAL:
		if(length == typesize[TYDREAL])
			return(TYDREAL);
		if(length == typesize[TYREAL])
			goto ret;
		break;

	case TYCOMPLEX:
		if(length == typesize[TYDCOMPLEX])
			return(TYDCOMPLEX);
		if(length == typesize[TYCOMPLEX])
			goto ret;
		break;

	case TYSHORT:
	case TYDREAL:
	case TYDCOMPLEX:
	case TYCHAR:
	case TYUNKNOWN:
	case TYSUBR:
	case TYERROR:
		goto ret;

	case TYLOGICAL:
		if(length == typesize[TYLOGICAL])
			goto ret;
		if(length == 1 || length == 2) {
			erri("treating LOGICAL*%d as LOGICAL", length);
			--nerr;	/* allow generation of .c file */
			goto ret;
			}
		break;

	case TYLONG:
		if(length == 0)
			return(tyint);
		if(length == typesize[TYSHORT])
			return(TYSHORT);
		if(length == typesize[TYLONG])
			goto ret;
		break;
	default:
		badtype("lengtype", type);
	}

	if(len != 0)
		err("incompatible type-length combination");

ret:
	return(type);
}





/* setintr -- Set Intrinsic function */

setintr(v)
register Namep  v;
{
	int k;

	if(v->vstg == STGUNKNOWN)
		v->vstg = STGINTR;
	else if(v->vstg!=STGINTR)
		dclerr("incompatible use of intrinsic function", v);
	if(v->vclass==CLUNKNOWN)
		v->vclass = CLPROC;
	if(v->vprocclass == PUNKNOWN)
		v->vprocclass = PINTRINSIC;
	else if(v->vprocclass != PINTRINSIC)
		dclerr("invalid intrinsic declaration", v);
	if(k = intrfunct(v->fvarname)) {
		if ((*(struct Intrpacked *)&k).f4)
			if (noextflag)
				goto unknown;
			else
				dcomplex_seen++;
		v->vardesc.varno = k;
		}
	else {
 unknown:
		dclerr("unknown intrinsic function", v);
		}
}



/* setext -- Set External declaration -- assume that unknowns will become
   procedures */

setext(v)
register Namep  v;
{
	if(v->vclass == CLUNKNOWN)
		v->vclass = CLPROC;
	else if(v->vclass != CLPROC)
		dclerr("invalid external declaration", v);

	if(v->vprocclass == PUNKNOWN)
		v->vprocclass = PEXTERNAL;
	else if(v->vprocclass != PEXTERNAL)
		dclerr("invalid external declaration", v);
} /* setext */




/* create dimensions block for array variable */

setbound(v, nd, dims)
register Namep  v;
int nd;
struct Dims dims[ ];
{
	register expptr q, t;
	register struct Dimblock *p;
	int i;
	extern chainp new_vars;
	char buf[256];

	if(v->vclass == CLUNKNOWN)
		v->vclass = CLVAR;
	else if(v->vclass != CLVAR)
	{
		dclerr("only variables may be arrays", v);
		return;
	}

	v->vdim = p = (struct Dimblock *)
	    ckalloc( sizeof(int) + (3+2*nd)*sizeof(expptr) );
	p->ndim = nd--;
	p->nelt = ICON(1);
	doin_setbound = 1;

	for(i = 0; i <= nd; ++i)
	{
		if( (q = dims[i].ub) == NULL)
		{
			if(i == nd)
			{
				frexpr(p->nelt);
				p->nelt = NULL;
			}
			else
				err("only last bound may be asterisk");
			p->dims[i].dimsize = ICON(1);
			;
			p->dims[i].dimexpr = NULL;
		}
		else
		{

			if(dims[i].lb)
			{
				q = mkexpr(OPMINUS, q, cpexpr(dims[i].lb));
				q = mkexpr(OPPLUS, q, ICON(1) );
			}
			if( ISCONST(q) )
			{
				p->dims[i].dimsize = q;
				p->dims[i].dimexpr = (expptr) PNULL;
			}
			else {
				sprintf(buf, " %s_dim%d", v->fvarname, i+1);
				p->dims[i].dimsize = (expptr)
					autovar(1, tyint, EXNULL, buf);
				p->dims[i].dimexpr = q;
				if (i == nd)
					v->vlastdim = new_vars;
				v->vdimfinish = 1;
			}
			if(p->nelt)
				p->nelt = mkexpr(OPSTAR, p->nelt,
				    cpexpr(p->dims[i].dimsize) );
		}
	}

	q = dims[nd].lb;
	if(q == NULL)
		q = ICON(1);

	for(i = nd-1 ; i>=0 ; --i)
	{
		t = dims[i].lb;
		if(t == NULL)
			t = ICON(1);
		if(p->dims[i].dimsize)
			q = mkexpr(OPPLUS, t, mkexpr(OPSTAR, cpexpr(p->dims[i].dimsize), q) );
	}

	if( ISCONST(q) )
	{
		p->baseoffset = q;
		p->basexpr = NULL;
	}
	else
	{
		sprintf(buf, " %s_offset", v->fvarname);
		p->baseoffset = (expptr) autovar(1, tyint, EXNULL, buf);
		p->basexpr = q;
		v->vdimfinish = 1;
	}
	doin_setbound = 0;
}



wr_abbrevs (outfile, function_head, vars)
FILE *outfile;
int function_head;
chainp vars;
{
    for (; vars; vars = vars -> nextp) {
	Namep name = (Namep) vars -> datap;
	if (!name->visused)
		continue;

	if (function_head)
	    nice_printf (outfile, "#define ");
	else
	    nice_printf (outfile, "#undef ");
	out_name (outfile, name);

	if (function_head) {
	    Extsym *comm = &extsymtab[name -> vardesc.varno];

	    nice_printf (outfile, " (");
	    extern_out (outfile, comm);
	    nice_printf (outfile, "%d.", comm->curno);
	    nice_printf (outfile, "%s)", name->cvarname);
	} /* if function_head */
	nice_printf (outfile, "\n");
    } /* for */
} /* wr_abbrevs */