4.4BSD/usr/src/usr.bin/pascal/src/conv.c
/*-
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)conv.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include "whoami.h"
#ifdef PI
#include "0.h"
#include "opcode.h"
#ifdef PC
# include <pcc.h>
#endif PC
#include "tree_ty.h"
#ifndef PC
#ifndef PI0
/*
* Convert a p1 into a p2.
* Mostly used for different
* length integers and "to real" conversions.
*/
convert(p1, p2)
struct nl *p1, *p2;
{
if (p1 == NLNIL || p2 == NLNIL)
return;
switch (width(p1) - width(p2)) {
case -7:
case -6:
(void) put(1, O_STOD);
return;
case -4:
(void) put(1, O_ITOD);
return;
case -3:
case -2:
(void) put(1, O_STOI);
return;
case -1:
case 0:
case 1:
return;
case 2:
case 3:
(void) put(1, O_ITOS);
return;
default:
panic("convert");
}
}
#endif
#endif PC
/*
* Compat tells whether
* p1 and p2 are compatible
* types for an assignment like
* context, i.e. value parameters,
* indicies for 'in', etc.
*/
compat(p1, p2, t)
struct nl *p1, *p2;
struct tnode *t;
{
register c1, c2;
c1 = classify(p1);
if (c1 == NIL)
return (NIL);
c2 = classify(p2);
if (c2 == NIL)
return (NIL);
switch (c1) {
case TBOOL:
case TCHAR:
if (c1 == c2)
return (1);
break;
case TINT:
if (c2 == TINT)
return (1);
case TDOUBLE:
if (c2 == TDOUBLE)
return (1);
#ifndef PI0
if (c2 == TINT && divflg == FALSE && t != TR_NIL ) {
divchk= TRUE;
c1 = classify(rvalue(t, NLNIL , RREQ ));
divchk = FALSE;
if (c1 == TINT) {
error("Type clash: real is incompatible with integer");
cerror("This resulted because you used '/' which always returns real rather");
cerror("than 'div' which divides integers and returns integers");
divflg = TRUE;
return (NIL);
}
}
#endif
break;
case TSCAL:
if (c2 != TSCAL)
break;
if (scalar(p1) != scalar(p2)) {
derror("Type clash: non-identical scalar types");
return (NIL);
}
return (1);
case TSTR:
if (c2 != TSTR)
break;
if (width(p1) != width(p2)) {
derror("Type clash: unequal length strings");
return (NIL);
}
return (1);
case TNIL:
if (c2 != TPTR)
break;
return (1);
case TFILE:
if (c1 != c2)
break;
derror("Type clash: files not allowed in this context");
return (NIL);
default:
if (c1 != c2)
break;
if (p1 != p2) {
derror("Type clash: non-identical %s types", clnames[c1]);
return (NIL);
}
if (p1->nl_flags & NFILES) {
derror("Type clash: %ss with file components not allowed in this context", clnames[c1]);
return (NIL);
}
return (1);
}
derror("Type clash: %s is incompatible with %s", clnames[c1], clnames[c2]);
return (NIL);
}
#ifndef PI0
#ifndef PC
/*
* Rangechk generates code to
* check if the type p on top
* of the stack is in range for
* assignment to a variable
* of type q.
*/
rangechk(p, q)
struct nl *p, *q;
{
register struct nl *rp;
#ifdef OBJ
register op;
int wq, wrp;
#endif
if (opt('t') == 0)
return;
rp = p;
if (rp == NIL)
return;
if (q == NIL)
return;
# ifdef OBJ
/*
* When op is 1 we are checking length
* 4 numbers against length 2 bounds,
* and adding it to the opcode forces
* generation of appropriate tests.
*/
op = 0;
wq = width(q);
wrp = width(rp);
op = wq != wrp && (wq == 4 || wrp == 4);
if (rp->class == TYPE || rp->class == CRANGE)
rp = rp->type;
switch (rp->class) {
case RANGE:
if (rp->range[0] != 0) {
# ifndef DEBUG
if (wrp <= 2)
(void) put(3, O_RANG2+op, ( short ) rp->range[0],
( short ) rp->range[1]);
else if (rp != nl+T4INT)
(void) put(3, O_RANG4+op, rp->range[0], rp->range[1] );
# else
if (!hp21mx) {
if (wrp <= 2)
(void) put(3, O_RANG2+op,( short ) rp->range[0],
( short ) rp->range[1]);
else if (rp != nl+T4INT)
(void) put(3, O_RANG4+op,rp->range[0],
rp->range[1]);
} else
if (rp != nl+T2INT && rp != nl+T4INT)
(void) put(3, O_RANG2+op,( short ) rp->range[0],
( short ) rp->range[1]);
# endif
break;
}
/*
* Range whose lower bounds are
* zero can be treated as scalars.
*/
case SCAL:
if (wrp <= 2)
(void) put(2, O_RSNG2+op, ( short ) rp->range[1]);
else
(void) put( 2 , O_RSNG4+op, rp->range[1]);
break;
default:
panic("rangechk");
}
# endif OBJ
# ifdef PC
/*
* pc uses precheck() and postcheck().
*/
panic("rangechk()");
# endif PC
}
#endif
#endif
#endif
#ifdef PC
/*
* if type p requires a range check,
* then put out the name of the checking function
* for the beginning of a function call which is completed by postcheck.
* (name1 is for a full check; name2 assumes a lower bound of zero)
*/
precheck( p , name1 , name2 )
struct nl *p;
char *name1 , *name2;
{
if ( opt( 't' ) == 0 ) {
return;
}
if ( p == NIL ) {
return;
}
if ( p -> class == TYPE ) {
p = p -> type;
}
switch ( p -> class ) {
case CRANGE:
putleaf( PCC_ICON , 0 , 0 , PCCM_ADDTYPE( PCCTM_FTN | PCCT_INT , PCCTM_PTR )
, name1);
break;
case RANGE:
if ( p != nl + T4INT ) {
putleaf( PCC_ICON , 0 , 0 ,
PCCM_ADDTYPE( PCCTM_FTN | PCCT_INT , PCCTM_PTR ),
p -> range[0] != 0 ? name1 : name2 );
}
break;
case SCAL:
/*
* how could a scalar ever be out of range?
*/
break;
default:
panic( "precheck" );
break;
}
}
/*
* if type p requires a range check,
* then put out the rest of the arguments of to the checking function
* a call to which was started by precheck.
* the first argument is what is being rangechecked (put out by rvalue),
* the second argument is the lower bound of the range,
* the third argument is the upper bound of the range.
*/
postcheck(need, have)
struct nl *need;
struct nl *have;
{
struct nl *p;
if ( opt( 't' ) == 0 ) {
return;
}
if ( need == NIL ) {
return;
}
if ( need -> class == TYPE ) {
need = need -> type;
}
switch ( need -> class ) {
case RANGE:
if ( need != nl + T4INT ) {
sconv(p2type(have), PCCT_INT);
if (need -> range[0] != 0 ) {
putleaf( PCC_ICON , (int) need -> range[0] , 0 , PCCT_INT ,
(char *) 0 );
putop( PCC_CM , PCCT_INT );
}
putleaf( PCC_ICON , (int) need -> range[1] , 0 , PCCT_INT ,
(char *) 0 );
putop( PCC_CM , PCCT_INT );
putop( PCC_CALL , PCCT_INT );
sconv(PCCT_INT, p2type(have));
}
break;
case CRANGE:
sconv(p2type(have), PCCT_INT);
p = need->nptr[0];
putRV(p->symbol, (p->nl_block & 037), p->value[0],
p->extra_flags, p2type( p ) );
putop( PCC_CM , PCCT_INT );
p = need->nptr[1];
putRV(p->symbol, (p->nl_block & 037), p->value[0],
p->extra_flags, p2type( p ) );
putop( PCC_CM , PCCT_INT );
putop( PCC_CALL , PCCT_INT );
sconv(PCCT_INT, p2type(have));
break;
case SCAL:
break;
default:
panic( "postcheck" );
break;
}
}
#endif PC
#ifdef DEBUG
conv(dub)
int *dub;
{
int newfp[2];
double *dp = ((double *) dub);
long *lp = ((long *) dub);
register int exp;
long mant;
newfp[0] = dub[0] & 0100000;
newfp[1] = 0;
if (*dp == 0.0)
goto ret;
exp = ((dub[0] >> 7) & 0377) - 0200;
if (exp < 0) {
newfp[1] = 1;
exp = -exp;
}
if (exp > 63)
exp = 63;
dub[0] &= ~0177600;
dub[0] |= 0200;
mant = *lp;
mant <<= 8;
if (newfp[0])
mant = -mant;
newfp[0] |= (mant >> 17) & 077777;
newfp[1] |= (((int) (mant >> 1)) & 0177400) | (exp << 1);
ret:
dub[0] = newfp[0];
dub[1] = newfp[1];
}
#endif