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/* $OpenBSD: code.c,v 1.6 2007/12/09 18:54:39 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"
/*
* cause the alignment to become a multiple of n
* never called for text segment.
*/
void
defalign(int n)
{
n /= SZCHAR;
if (n == 1)
return;
printf(" .align %d\n", n);
}
/*
* define the current location as the name p->sname
* never called for text segment.
*/
void
defnam(struct symtab *p)
{
char *c = p->sname;
#ifdef GCC_COMPAT
c = gcc_findname(p);
#endif
if (p->sclass == EXTDEF)
printf(" .globl %s\n", c);
printf("%s:\n", c);
}
/*
* code for the end of a function
* deals with struct return here
*/
void
efcode()
{
extern int gotnr;
NODE *p, *q;
gotnr = 0; /* new number for next fun */
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 = EBP;
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)
{
extern int gotnr;
NODE *n, *p;
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 (kflag) {
/* Put ebx in temporary */
n = block(REG, NIL, NIL, INT, 0, MKSUE(INT));
n->n_rval = EBX;
p = tempnode(0, INT, 0, MKSUE(INT));
gotnr = p->n_lval;
ecomp(buildtree(ASSIGN, p, n));
}
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;
spname = sp[i];
n = tempnode(0, sp[i]->stype, sp[i]->sdf, sp[i]->ssue);
n = buildtree(ASSIGN, n, buildtree(NAME, 0, 0));
sp[i]->soffset = n->n_left->n_lval;
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)
{
extern int gotnr;
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;
}
if (kflag == 0)
return p;
/* Create an ASSIGN node for ebx */
l = block(REG, NIL, NIL, INT, 0, MKSUE(INT));
l->n_rval = EBX;
l = buildtree(ASSIGN, l, tempnode(gotnr, INT, 0, MKSUE(INT)));
if (p->n_right->n_op != CM) {
p->n_right = block(CM, l, p->n_right, INT, 0, MKSUE(INT));
} else {
for (r = p->n_right; r->n_left->n_op == CM; r = r->n_left)
;
r->n_left = block(CM, l, r->n_left, INT, 0, MKSUE(INT));
}
return p;
}
/*
* Print character t at position i in one string, until t == -1.
* Locctr & label is already defined.
*/
void
bycode(int t, int i)
{
static int lastoctal = 0;
/* put byte i+1 in a string */
if (t < 0) {
if (i != 0)
puts("\"");
} else {
if (i == 0)
printf("\t.ascii \"");
if (t == '\\' || t == '"') {
lastoctal = 0;
putchar('\\');
putchar(t);
} else if (t < 040 || t >= 0177) {
lastoctal++;
printf("\\%o",t);
} else if (lastoctal && '0' <= t && t <= '9') {
lastoctal = 0;
printf("\"\n\t.ascii \"%c", t);
} else {
lastoctal = 0;
putchar(t);
}
}
}
/*
* 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;
}
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