[unix-history] / usr / src / ucb / pascal / src / sconv.c

/* Copyright (c) 1983 Regents of the University of California */

static	char sccsid[] = "@(#)sconv.c 1.2 2/1/83";

    /*
     *	functions to help pi put out
     *	polish postfix binary portable c compiler intermediate code
     *	thereby becoming the portable pascal compiler
     */

#include	"whoami.h"
#ifdef PC
#include	"0.h"
#include	"pcops.h"

    /*
     *	this routine enforces ``the usual arithmetic conversions''
     *	all integral operands are converted to ints.
     *	if either operand is a double, both are made to be double.
     *	this routine takes struct nl *'s for the types,
     *	and returns both the struct nl * and the p2type for the result.
     */
tuac(thistype, thattype, resulttypep, resultp2typep)
    struct nl	*thistype;
    struct nl	*thattype;
    struct nl	**resulttypep;
    int		*resultp2typep;
{
    int		thisp2type = p2type(thistype);
    int		thatp2type = p2type(thattype);

    *resulttypep = thistype;
    *resultp2typep = thisp2type;
	/*
	 *	should only be passed scalars
	 */
    if (isnta(thistype,"sbcid") || isnta(thattype,"sbcid")) {
	return;
    }
    if (thisp2type == P2CHAR || thisp2type == P2SHORT) {
	*resultp2typep = P2INT;
	*resulttypep = nl + T4INT;
    }
    if (*resultp2typep == P2INT && thatp2type == P2DOUBLE) {
	*resultp2typep = P2DOUBLE;
	*resulttypep = nl + TDOUBLE;
    }
    sconv(thisp2type, *resultp2typep);
}
    
    /*
     *	this routine will emit sconv operators when it thinks they are needed.
     *	this is code generator specific, rather than machine-specific.
     *	this routine takes p2types for arguments, not struct nl *'s.
     */
#ifdef vax
    /*
     *	the vax code genrator is very good, this routine is extremely boring.
     */
sconv(fromp2type, top2type)
    int	fromp2type;
    int	top2type;
{

    switch (top2type) {
	case P2CHAR:
	case P2SHORT:
	case P2INT:
	    switch (fromp2type) {
		case P2CHAR:
		case P2SHORT:
		case P2INT:
		case P2DOUBLE:
			return;	/* pass1 knows how to do these */
		default:
			return;
	    }
	case P2DOUBLE:
	    switch (fromp2type) {
		case P2CHAR:
		case P2SHORT:
		case P2INT:
			putop(P2SCONV, P2DOUBLE);
			return;
		case P2DOUBLE:
			return;
		default:
			return;
	    }
	default:
		return;
    }
}
#endif vax
#ifdef mc68000
    /*
     *	i don't know how much to trust the mc68000 compiler,
     *	so this routine is full.
     */
sconv(fromp2type, top2type)
    int	fromp2type;
    int	top2type;
{

    switch (top2type) {
	case P2CHAR:
	    switch (fromp2type) {
		case P2CHAR:
			return;
		case P2SHORT:
		case P2INT:
		case P2DOUBLE:
			putop(P2SCONV, P2CHAR);
			return;
		default:
			return;
	    }
	case P2SHORT:
	    switch (fromp2type) {
		case P2SHORT:
			return;
		case P2CHAR:
		case P2INT:
		case P2DOUBLE:
			putop(P2SCONV, P2SHORT);
			return;
		default:
			return;
	    }
	case P2INT:
	    switch (fromp2type) {
		case P2INT:
			return;
		case P2CHAR:
		case P2SHORT:
		case P2DOUBLE:
			putop(P2SCONV, P2INT);
			return;
		default:
			return;
	    }
	case P2DOUBLE:
	    switch (fromp2type) {
		case P2DOUBLE:
			return;
		case P2CHAR:
		case P2SHORT:
		case P2INT:
			putop(P2SCONV, P2DOUBLE);
			return;
		default:
			return;
	    }
	default:
		return;
    }
}
#endif mc68000
#endif PC
Commit	Line	Data
93009ed7 KM	1	/* Copyright (c) 1983 Regents of the University of California */
93009ed7 KM	2
e804469b	3	static char sccsid[] = "@(#)sconv.c 1.2 2/1/83";
93009ed7 KM	4
	5	/*
	6	* functions to help pi put out
	7	* polish postfix binary portable c compiler intermediate code
	8	* thereby becoming the portable pascal compiler
	9	*/
	10
	11	#include "whoami.h"
	12	#ifdef PC
	13	#include "0.h"
	14	#include "pcops.h"
93009ed7 KM	15
	16	/*
	17	* this routine enforces ``the usual arithmetic conversions''
	18	* all integral operands are converted to ints.
	19	* if either operand is a double, both are made to be double.
	20	* this routine takes struct nl *'s for the types,
	21	* and returns both the struct nl * and the p2type for the result.
	22	*/
	23	tuac(thistype, thattype, resulttypep, resultp2typep)
	24	struct nl *thistype;
	25	struct nl *thattype;
	26	struct nl **resulttypep;
	27	int *resultp2typep;
	28	{
	29	int thisp2type = p2type(thistype);
	30	int thatp2type = p2type(thattype);
	31
	32	*resulttypep = thistype;
	33	*resultp2typep = thisp2type;
	34	/*
	35	* should only be passed scalars
	36	*/
	37	if (isnta(thistype,"sbcid") \|\| isnta(thattype,"sbcid")) {
	38	return;
	39	}
3a73d1c1	40	if (thisp2type == P2CHAR \|\| thisp2type == P2SHORT) {
93009ed7 KM	41	*resultp2typep = P2INT;
	42	*resulttypep = nl + T4INT;
	43	}
	44	if (*resultp2typep == P2INT && thatp2type == P2DOUBLE) {
	45	*resultp2typep = P2DOUBLE;
	46	*resulttypep = nl + TDOUBLE;
	47	}
	48	sconv(thisp2type, *resultp2typep);
	49	}
	50
	51	/*
	52	* this routine will emit sconv operators when it thinks they are needed.
	53	* this is code generator specific, rather than machine-specific.
	54	* this routine takes p2types for arguments, not struct nl *'s.
	55	*/
	56	#ifdef vax
	57	/*
	58	* the vax code genrator is very good, this routine is extremely boring.
	59	*/
	60	sconv(fromp2type, top2type)
	61	int fromp2type;
	62	int top2type;
	63	{
	64
	65	switch (top2type) {
	66	case P2CHAR:
	67	case P2SHORT:
	68	case P2INT:
	69	switch (fromp2type) {
	70	case P2CHAR:
	71	case P2SHORT:
	72	case P2INT:
	73	case P2DOUBLE:
	74	return; /* pass1 knows how to do these */
	75	default:
	76	return;
	77	}
	78	case P2DOUBLE:
	79	switch (fromp2type) {
	80	case P2CHAR:
	81	case P2SHORT:
	82	case P2INT:
	83	putop(P2SCONV, P2DOUBLE);
	84	return;
	85	case P2DOUBLE:
	86	return;
	87	default:
	88	return;
	89	}
	90	default:
	91	return;
	92	}
	93	}
	94	#endif vax
	95	#ifdef mc68000
	96	/*
	97	* i don't know how much to trust the mc68000 compiler,
	98	* so this routine is full.
	99	*/
	100	sconv(fromp2type, top2type)
	101	int fromp2type;
	102	int top2type;
	103	{
	104
105	switch (top2type) {
106	case P2CHAR:
107	switch (fromp2type) {
108	case P2CHAR:
109	return;
110	case P2SHORT:
111	case P2INT:
112	case P2DOUBLE:
113	putop(P2SCONV, P2CHAR);
114	return;
115	default:
116	return;
117	}
118	case P2SHORT:
119	switch (fromp2type) {
120	case P2SHORT:
121	return;
122	case P2CHAR:
123	case P2INT:
124	case P2DOUBLE:
125	putop(P2SCONV, P2SHORT);
126	return;
127	default:
128	return;
129	}
130	case P2INT:
131	switch (fromp2type) {
132	case P2INT:
133	return;
134	case P2CHAR:
135	case P2SHORT:
136	case P2DOUBLE:
137	putop(P2SCONV, P2INT);
138	return;
139	default:
140	return;
141	}
142	case P2DOUBLE:
143	switch (fromp2type) {
144	case P2DOUBLE:
145	return;
146	case P2CHAR:
147	case P2SHORT:
148	case P2INT:
149	putop(P2SCONV, P2DOUBLE);
150	return;
151	default:
152	return;
153	}
154	default:
155	return;
156	}
157	}
158	#endif mc68000
159	#endif PC