source: mainline/uspace/app/pcc/arch/pdp11/code.c@ 814717fa

/*      $Id: code.c,v 1.3 2009/02/08 16:41:35 ragge Exp $       */
/*
 * Copyright (c) 2003 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 "pass1.h"

int lastloc = -1;

/*
 * Define everything needed to print out some data (or text).
 * This means segment, alignment, visibility, etc.
 */
void
defloc(struct symtab *sp)
{
        static char *loctbl[] = { "text", "data", "data" };
        TWORD t;
        char *n;
        int s;

        if (sp == NULL) {
                lastloc = -1;
                return;
        }
        t = sp->stype;
        s = ISFTN(t) ? PROG : ISCON(cqual(t, sp->squal)) ? RDATA : DATA;
        if (s != lastloc)
                printf("        .%s\n", loctbl[s]);
        lastloc = s;
        while (ISARY(t))
                t = DECREF(t);
        n = sp->soname ? sp->soname : exname(sp->sname);
        if (sp->sclass == EXTDEF)
                printf("        .globl %s\n", n);
        if (ISFTN(sp->stype) || talign(sp->stype, sp->ssue) > ALCHAR)
                printf(".even\n");
        if (sp->slevel == 0) {
                printf("%s:\n", n);
        } else {
                printf(LABFMT ":\n", sp->soffset);
        }
}

/*
 * code for the end of a function
 * deals with struct return here
 */
void
efcode()
{
        NODE *p, *q;

        if (cftnsp->stype != STRTY+FTN && cftnsp->stype != UNIONTY+FTN)
                return;
        /* Create struct assignment */
        q = block(OREG, NIL, NIL, PTR+STRTY, 0, cftnsp->ssue);
        q->n_rval = R5;
        q->n_lval = 8; /* return buffer offset */
        q = buildtree(UMUL, q, NIL);
        p = block(REG, NIL, NIL, PTR+STRTY, 0, cftnsp->ssue);
        p = buildtree(UMUL, p, NIL);
        p = buildtree(ASSIGN, q, p);
        ecomp(p);
}

/*
 * code for the beginning of a function; a is an array of
 * indices in symtab for the arguments; n is the number
 */
void
bfcode(struct symtab **sp, int cnt)
{
        struct symtab *sp2;
        NODE *n;
        int i;

        if (cftnsp->stype == STRTY+FTN || cftnsp->stype == UNIONTY+FTN) {
                /* Function returns struct, adjust arg offset */
                for (i = 0; i < cnt; i++) 
                        sp[i]->soffset += SZPOINT(INT);
        }

        if (xtemps == 0)
                return;

        /* put arguments in temporaries */
        for (i = 0; i < cnt; i++) {
                if (sp[i]->stype == STRTY || sp[i]->stype == UNIONTY ||
                    cisreg(sp[i]->stype) == 0)
                        continue;
                sp2 = sp[i];
                n = tempnode(0, sp[i]->stype, sp[i]->sdf, sp[i]->ssue);
                n = buildtree(ASSIGN, n, nametree(sp2));
                sp[i]->soffset = regno(n->n_left);
                sp[i]->sflags |= STNODE;
                ecomp(n);
        }
}


/*
 * by now, the automatics and register variables are allocated
 */
void
bccode()
{
        SETOFF(autooff, SZINT);
}

/* called just before final exit */
/* flag is 1 if errors, 0 if none */
void
ejobcode(int flag )
{
}

void
bjobcode()
{
}

/*
 * Called with a function call with arguments as argument.
 * This is done early in buildtree() and only done once.
 * Returns p.
 */
NODE *
funcode(NODE *p)
{
        NODE *r, *l;

        /* Fix function call arguments. On x86, just add funarg */
        for (r = p->n_right; r->n_op == CM; r = r->n_left) {
                if (r->n_right->n_op != STARG)
                        r->n_right = block(FUNARG, r->n_right, NIL,
                            r->n_right->n_type, r->n_right->n_df,
                            r->n_right->n_sue);
        }
        if (r->n_op != STARG) {
                l = talloc();
                *l = *r;
                r->n_op = FUNARG;
                r->n_left = l;
                r->n_type = l->n_type;
        }
        return p;
}

/*
 * return the alignment of field of type t
 */
int
fldal(unsigned int t)
{
        uerror("illegal field type");
        return(ALINT);
}

/* fix up type of field p */
void
fldty(struct symtab *p)
{
}

/*
 * XXX - fix genswitch.
 */
int
mygenswitch(int num, TWORD type, struct swents **p, int n)
{
        return 0;
}