exec.c

把fortran语言编的程序转为c语言编的程序, 运行环境linux

/****************************************************************
Copyright 1990, 1993, 1994 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 "p1defs.h"
#include "names.h"

static void exar2 Argdcl((int, tagptr, struct Labelblock*, struct Labelblock*));
static void popctl Argdcl((void));
static void pushctl Argdcl((int));

/*   Logical IF codes
*/

 void
#ifdef KR_headers
exif(p)
	expptr p;
#else
exif(expptr p)
#endif
{
    pushctl(CTLIF);
    putif(p, 0);	/* 0 => if, not elseif */
}


 void
#ifdef KR_headers
exelif(p)
	expptr p;
#else
exelif(expptr p)
#endif
{
    if (ctlstack->ctltype == CTLIF || ctlstack->ctltype == CTLIFX)
	putif(p, 1);	/* 1 ==> elseif */
    else
	execerr("elseif out of place", CNULL);
}




 void
exelse(Void)
{
	register struct Ctlframe *c;

	for(c = ctlstack; c->ctltype == CTLIFX; --c);
	if(c->ctltype == CTLIF) {
		p1_else ();
		c->ctltype = CTLELSE;
		}
	else
		execerr("else out of place", CNULL);
	}

 void
#ifdef KR_headers
exendif()
#else
exendif()
#endif
{
	while(ctlstack->ctltype == CTLIFX) {
		popctl();
		p1else_end();
		}
	if(ctlstack->ctltype == CTLIF) {
		popctl();
		p1_endif ();
		}
	else if(ctlstack->ctltype == CTLELSE) {
		popctl();
		p1else_end ();
		}
	else
		execerr("endif out of place", CNULL);
	}


 void
#ifdef KR_headers
new_endif()
#else
new_endif()
#endif
{
	if (ctlstack->ctltype == CTLIF || ctlstack->ctltype == CTLIFX)
		pushctl(CTLIFX);
	else
		err("new_endif bug");
	}

/* pushctl -- Start a new control construct, initialize the labels (to
   zero) */

 LOCAL void
#ifdef KR_headers
pushctl(code)
	int code;
#else
pushctl(int code)
#endif
{
	register int i;

	if(++ctlstack >= lastctl)
		many("loops or if-then-elses", 'c', maxctl);
	ctlstack->ctltype = code;
	for(i = 0 ; i < 4 ; ++i)
		ctlstack->ctlabels[i] = 0;
	ctlstack->dowhile = 0;
	++blklevel;
}


 LOCAL void
popctl(Void)
{
	if( ctlstack-- < ctls )
		Fatal("control stack empty");
	--blklevel;
}



/* poplab -- update the flags in   labeltab   */

 LOCAL void
poplab(Void)
{
	register struct Labelblock  *lp;

	for(lp = labeltab ; lp < highlabtab ; ++lp)
		if(lp->labdefined)
		{
			/* mark all labels in inner blocks unreachable */
			if(lp->blklevel > blklevel)
				lp->labinacc = YES;
		}
		else if(lp->blklevel > blklevel)
		{
			/* move all labels referred to in inner blocks out a level */
			lp->blklevel = blklevel;
		}
}


/*  BRANCHING CODE
*/
 void
#ifdef KR_headers
exgoto(lab)
	struct Labelblock *lab;
#else
exgoto(struct Labelblock *lab)
#endif
{
	lab->labused = 1;
	p1_goto (lab -> stateno);
}






 void
#ifdef KR_headers
exequals(lp, rp)
	register struct Primblock *lp;
	register expptr rp;
#else
exequals(register struct Primblock *lp, register expptr rp)
#endif
{
	if(lp->tag != TPRIM)
	{
		err("assignment to a non-variable");
		frexpr((expptr)lp);
		frexpr(rp);
	}
	else if(lp->namep->vclass!=CLVAR && lp->argsp)
	{
		if(parstate >= INEXEC)
			errstr("statement function %.62s amid executables.",
				lp->namep->fvarname);
		mkstfunct(lp, rp);
	}
	else if (lp->vtype == TYSUBR)
		err("illegal use of subroutine name");
	else
	{
		expptr new_lp, new_rp;

		if(parstate < INDATA)
			enddcl();
		new_lp = mklhs (lp, keepsubs);
		new_rp = fixtype (rp);
		puteq(new_lp, new_rp);
	}
}



/* Make Statement Function */

long laststfcn = -1, thisstno;
int doing_stmtfcn;

 void
#ifdef KR_headers
mkstfunct(lp, rp)
	struct Primblock *lp;
	expptr rp;
#else
mkstfunct(struct Primblock *lp, expptr rp)
#endif
{
	register struct Primblock *p;
	register Namep np;
	chainp args;

	laststfcn = thisstno;
	np = lp->namep;
	if(np->vclass == CLUNKNOWN)
		np->vclass = CLPROC;
	else
	{
		dclerr("redeclaration of statement function", np);
		return;
	}
	np->vprocclass = PSTFUNCT;
	np->vstg = STGSTFUNCT;

/* Set the type of the function */

	impldcl(np);
	if (np->vtype == TYCHAR && !np->vleng)
		err("character statement function with length (*)");
	args = (lp->argsp ? lp->argsp->listp : CHNULL);
	np->varxptr.vstfdesc = mkchain((char *)args, (chainp)rp);

	for(doing_stmtfcn = 1 ; args ; args = args->nextp)

/* It is an error for the formal parameters to have arguments or
   subscripts */

		if( ((tagptr)(args->datap))->tag!=TPRIM ||
		    (p = (struct Primblock *)(args->datap) )->argsp ||
		    p->fcharp || p->lcharp ) {
			err("non-variable argument in statement function definition");
			args->datap = 0;
			}
		else
		{

/* Replace the name on the left-hand side */

			args->datap = (char *)p->namep;
			vardcl(p -> namep);
			free((char *)p);
		}
	doing_stmtfcn = 0;
}

 static void
#ifdef KR_headers
mixed_type(np)
	Namep np;
#else
mixed_type(Namep np)
#endif
{
	char buf[128];
	sprintf(buf, "%s function %.90s invoked as subroutine",
		ftn_types[np->vtype], np->fvarname);
	warn(buf);
	}

 void
#ifdef KR_headers
excall(name, args, nstars, labels)
	Namep name;
	struct Listblock *args;
	int nstars;
	struct Labelblock **labels;
#else
excall(Namep name, struct Listblock *args, int nstars, struct Labelblock **labels)
#endif
{
	register expptr p;

	if (name->vtype != TYSUBR) {
		if (name->vinfproc && !name->vcalled) {
			name->vtype = TYSUBR;
			frexpr(name->vleng);
			name->vleng = 0;
			}
		else if (!name->vimpltype && name->vtype != TYUNKNOWN)
			mixed_type(name);
		else
			settype(name, TYSUBR, (ftnint)0);
		}
	p = mkfunct( mkprim(name, args, CHNULL) );
	if (p->tag == TERROR)
		return;

/* Subroutines and their identifiers acquire the type INT */

	p->exprblock.vtype = p->exprblock.leftp->headblock.vtype = TYINT;

/* Handle the alternate return mechanism */

	if(nstars > 0)
		putcmgo(putx(fixtype(p)), nstars, labels);
	else
		putexpr(p);
}


 void
#ifdef KR_headers
exstop(stop, p)
	int stop;
	register expptr p;
#else
exstop(int stop, register expptr p)
#endif
{
	char *str;
	int n;

	if(p)
	{
		if( ! ISCONST(p) )
		{
			execerr("pause/stop argument must be constant", CNULL);
			frexpr(p);
			p = mkstrcon(0, CNULL);
		}
		else if( ISINT(p->constblock.vtype) )
		{
			str = convic(p->constblock.Const.ci);
			n = strlen(str);
			if(n > 0)
			{
				p->constblock.Const.ccp = copyn(n, str);
				p->constblock.Const.ccp1.blanks = 0;
				p->constblock.vtype = TYCHAR;
				p->constblock.vleng = (expptr) ICON(n);
			}
			else
				p = (expptr) mkstrcon(0, CNULL);
		}
		else if(p->constblock.vtype != TYCHAR)
		{
			execerr("pause/stop argument must be integer or string", CNULL);
			p = (expptr) mkstrcon(0, CNULL);
		}
	}
	else	p = (expptr) mkstrcon(0, CNULL);

    {
	expptr subr_call;

	subr_call = call1(TYSUBR, (stop ? "s_stop" : "s_paus"), p);
	putexpr( subr_call );
    }
}

/* DO LOOP CODE */

#define DOINIT	par[0]
#define DOLIMIT	par[1]
#define DOINCR	par[2]


/* Macros for   ctlstack -> dostepsign   */

#define VARSTEP	0
#define POSSTEP	1
#define NEGSTEP	2


/* exdo -- generate DO loop code.  In the case of a variable increment,
   positive increment tests are placed above the body, negative increment
   tests are placed below (see   enddo()   ) */

 void
#ifdef KR_headers
exdo(range, loopname, spec)
	int range;
	Namep loopname;
	chainp spec;
#else
exdo(int range, Namep loopname, chainp spec)
#endif
			/* range = end label */
			/* input spec must have at least 2 exprs */
{
	register expptr p;
	register Namep np;
	chainp cp;		/* loops over the fields in   spec */
	register int i;
	int dotype;		/* type of the index variable */
	int incsign;		/* sign of the increment, if it's constant
				   */
	Addrp dovarp;		/* loop index variable */
	expptr doinit;		/* constant or register for init param */
	expptr par[3];		/* local specification parameters */

	expptr init, test, inc;	/* Expressions in the resulting FOR loop */


	test = ENULL;

	pushctl(CTLDO);
	dorange = ctlstack->dolabel = range;
	ctlstack->loopname = loopname;

/* Declare the loop index */

	np = (Namep)spec->datap;
	ctlstack->donamep = NULL;
	if (!np) { /* do while */
		ctlstack->dowhile = 1;
#if 0
		if (loopname) {
			if (loopname->vtype == TYUNKNOWN) {
				loopname->vdcldone = 1;
				loopname->vclass = CLLABEL;
				loopname->vprocclass = PLABEL;
				loopname->vtype = TYLABEL;
				}
			if (loopname->vtype == TYLABEL)
				if (loopname->vdovar)
					dclerr("already in use as a loop name",
						loopname);
				else
					loopname->vdovar = 1;
			else