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/* $OpenBSD: order.c,v 1.3 2007/12/22 13:13:27 stefan Exp $ */
/*
* Copyright (c) 2006 Anders Magnusson (ragge@ludd.luth.se).
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
# include "pass2.h"
#include <string.h>
int canaddr(NODE *);
/* is it legal to make an OREG or NAME entry which has an
* offset of off, (from a register of r), if the
* resulting thing had type t */
int
notoff(TWORD t, int r, CONSZ off, char *cp)
{
if (r != 2 && r != 3)
return 1; /* can only index ac2 and ac3 */
if (t == CHAR || t == UCHAR) {
if (off < -256 || off > 254)
return 1;
} else if (off < -128 || off > 127)
return 1;
return(0); /* YES */
}
/*
* Turn a UMUL-referenced node into OREG.
* Be careful about register classes, this is a place where classes change.
*/
void
offstar(NODE *p, int shape)
{
NODE *r;
if (x2debug)
printf("offstar(%p)\n", p);
if (isreg(p))
return; /* Is already OREG */
r = p->n_right;
if( p->n_op == PLUS || p->n_op == MINUS ){
if( r->n_op == ICON ){
if (isreg(p->n_left) == 0 ||
(p->n_left->n_op == REG &&
p->n_left->n_rval != 2 && p->n_left->n_rval != 3))
(void)geninsn(p->n_left, INBREG);
/* Converted in ormake() */
return;
}
}
(void)geninsn(p, INBREG);
}
/*
* Do the actual conversion of offstar-found OREGs into real OREGs.
*/
void
myormake(NODE *q)
{
if (x2debug)
printf("myormake(%p)\n", q);
}
/*
* Shape matches for UMUL. Cooperates with offstar().
*/
int
shumul(NODE *p)
{
if (x2debug)
printf("shumul(%p)\n", p);
/* Turns currently anything into OREG on x86 */
return SOREG;
}
/*
* Rewrite increment/decrement operation.
*/
int
setincr(NODE *p)
{
if (x2debug)
printf("setincr(%p)\n", p);
return(0);
}
/*
* Rewrite operations on binary operators (like +, -, etc...).
* Called as a result of table lookup.
*/
int
setbin(NODE *p)
{
if (x2debug)
printf("setbin(%p)\n", p);
return 0;
}
/* setup for assignment operator */
int
setasg(NODE *p, int cookie)
{
if (x2debug)
printf("setasg(%p)\n", p);
return(0);
}
/* setup for unary operator */
int
setuni(NODE *p, int cookie)
{
return 0;
}
/*
* Special handling of some instruction register allocation.
*/
struct rspecial *
nspecial(struct optab *q)
{
comperr("nspecial entry %d", q - table);
return 0; /* XXX gcc */
}
/*
* Set evaluation order of a binary node if it differs from default.
*/
int
setorder(NODE *p)
{
return 0;
}
/*
* Set registers "live" at function calls (like arguments in registers).
* This is for liveness analysis of registers.
*/
int *
livecall(NODE *p)
{
static int r[1] = { -1 }; /* Terminate with -1 */
return &r[0];
}
/*
* Signal whether the instruction is acceptable for this target.
*/
int
acceptable(struct optab *op)
{
return 1;
}
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