/*
* 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 *l, *r;
TWORD t;
int i;
nsse = ngpr = nrsp = 0;
/* Check if hidden arg needed */
/* If so, add it in pass2 */
if ((l = p->n_left)->n_type == INCREF(FTN)+STRTY ||
l->n_type == INCREF(FTN)+UNIONTY) {
int ssz = tsize(BTYPE(l->n_type), l->n_df, l->n_ap);
if (ssz > 2*SZLONG)
ngpr++;
}
/* Convert just regs to assign insn's */
p->n_right = argput(p->n_right);
/* Must sort arglist so that STASG ends up first */
/* This avoids registers being clobbered */
while (argsort(p->n_right))
;
/* Check if there are varargs */
if (nsse || l->n_df == NULL || l->n_df->dfun == NULL) {
; /* Need RAX */
} else {
union arglist *al = l->n_df->dfun;
for (; al->type != TELLIPSIS; al++) {
if ((t = al->type) == TNULL)
return p; /* No need */
if (ISSOU(BTYPE(t)))
al++;
for (i = 0; t > BTMASK; t = DECREF(t))
if (ISARY(t) || ISFTN(t))
i++;
if (i)
al++;
}
}
/* Always emit number of SSE regs used */
l = movtoreg(bcon(nsse), RAX);
if (p->n_right->n_op != CM) {
p->n_right = block(CM, l, p->n_right, INT, 0, 0);
} 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, 0);
}
return p;
}
/*
* Fixup struct/unions depending on attributes.
*/
void
gcc_tcattrfix(NODE *p)
{
struct symtab *sp;
struct attr *ap;
int sz, coff, csz, al, oal, mxal;
if (!ISSOU(p->n_type)) /* only for structs or unions */
return;
if ((ap = attr_find(p->n_ap, GCC_ATYP_PACKED)) == NULL)
return; /* nothing to fix */
al = ap->iarg(0);
mxal = 0;
/* Must repack struct */
coff = csz = 0;
for (sp = strmemb(ap); sp; sp = sp->snext) {
oal = talign(sp->stype, sp->sap);
if (oal > al)
oal = al;
if (mxal < oal)
mxal = oal;
if (sp->sclass & FIELD)
sz = sp->sclass&FLDSIZ;
else
sz = (int)tsize(sp->stype, sp->sdf, sp->sap);
sp->soffset = upoff(sz, oal, &coff);
if (coff > csz)
csz = coff;
if (p->n_type == UNIONTY)
coff = 0;
}
if (mxal < ALCHAR)
mxal = ALCHAR; /* for bitfields */
SETOFF(csz, mxal); /* Roundup to whatever */
ap = attr_find(p->n_ap, ATTR_STRUCT);
ap->amsize = csz;
ap = attr_find(p->n_ap, ATTR_ALIGNED);
ap->iarg(0) = mxal;
}
NODE *
amd64_builtin_va_arg(NODE *f, NODE *a, TWORD t)
{
NODE *ap, *r, *dp;
ap = a->n_left;
dp = a->n_right;
if (dp->n_type <= ULONGLONG || ISPTR(dp->n_type) ||
dp->n_type == FLOAT || dp->n_type == DOUBLE) {
/* type might be in general register */
if (dp->n_type == FLOAT || dp->n_type == DOUBLE) {
f->n_sp = lookup(fpnext, SNORMAL);
varneeds |= NEED_FPNEXT;
} else {
f->n_sp = lookup(gpnext, SNORMAL);
varneeds |= NEED_GPNEXT;
}
f->n_type = f->n_sp->stype = INCREF(dp->n_type) + (FTN-PTR);
f->n_ap = dp->n_ap;
f->n_df = /* dp->n_df */ NULL;
f = clocal(f);
r = buildtree(CALL, f, ccopy(ap));
} else if (ISSOU(dp->n_type) || dp->n_type == LDOUBLE) {
/* put a reference directly to the stack */
int sz = tsize(dp->n_type, dp->n_df, dp->n_ap);
int al = talign(dp->n_type, dp->n_ap);
if (al < ALLONG)
al = ALLONG;
if (sz <= SZLONG*2 && al == ALLONG) {
if (sz <= SZLONG) {
f->n_sp = lookup(_1regref, SNORMAL);
varneeds |= NEED_1REGREF;
} else {
f->n_sp = lookup(_2regref, SNORMAL);
varneeds |= NEED_2REGREF;
}
f->n_type = f->n_sp->stype;
f = clocal(f);
r = buildtree(CALL, f, ccopy(ap));
r = ccast(r, INCREF(dp->n_type), 0, dp->n_df, dp->n_ap);
r = buildtree(UMUL, r, NIL);
} else {
f->n_sp = lookup(memref, SNORMAL);
varneeds |= NEED_MEMREF;
f->n_type = f->n_sp->stype;
f = clocal(f);
SETOFF(sz, al);
r = buildtree(CALL, f,
buildtree(CM, ccopy(ap), bcon(sz/SZCHAR)));
r = ccast(r, INCREF(dp->n_type), 0, dp->n_df, dp->n_ap);
r = buildtree(UMUL, r, NIL);
}
} else {
uerror("amd64_builtin_va_arg not supported type");
goto bad;
}
tfree(a);
return r;
bad:
uerror("bad argument to __builtin_va_arg");
return bcon(0);
}
/*
* 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;
#ifdef GCC_COMPAT
struct attr *ap;
#endif
NODE *r, *l;
TWORD t = DECREF(DECREF(p->n_left->n_type));
int stcall;
stcall = ISSOU(t);
/*
* We may have to prepend:
* - Hidden arg0 for struct return (in reg or on stack).
* - ebx in case of PIC code.
*/
/* 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 = intprom(r->n_right);
r->n_right = block(FUNARG, r->n_right, NIL,
r->n_right->n_type, r->n_right->n_df,
r->n_right->n_ap);
}
}
if (r->n_op != STARG) {
l = talloc();
*l = *r;
r->n_op = FUNARG;
r->n_left = l;
r->n_left = intprom(r->n_left);
r->n_type = r->n_left->n_type;
}
if (stcall) {
/* Prepend a placeholder for struct address. */
/* Use BP, can never show up under normal circumstances */
l = talloc();
*l = *r;
r->n_op = CM;
r->n_right = l;
r->n_type = INT;
l = block(REG, 0, 0, INCREF(VOID), 0, 0);
regno(l) = BP;
l = block(FUNARG, l, 0, INCREF(VOID), 0, 0);
r->n_left = l;
}
#ifdef GCC_COMPAT
if ((ap = attr_find(p->n_left->n_ap, GCC_ATYP_REGPARM)))
rparg = ap->iarg(0);
else
#endif
rparg = 0;
regcvt = 0;
if (rparg)
listf(p->n_right, addreg);
return p;
}
/*
* code for the beginning of a function; a is an array of
* indices in symtab for the arguments; n is the number
*
* Classifying args on i386; not simple:
* - Args may be on stack or in registers (regparm)
* - There may be a hidden first arg, unless OpenBSD struct return.
* - Regparm syntax is not well documented.
* - There may be stdcall functions, where the called function pops stack
* - ...probably more
*/
void
bfcode(struct symtab **sp, int cnt)
{
extern int argstacksize;
#ifdef GCC_COMPAT
struct attr *ap;
#endif
struct symtab *sp2;
extern int gotnr;
NODE *n, *p;
int i, regparmarg;
int argbase, nrarg, sz;
argbase = ARGINIT;
nrarg = regparmarg = 0;
#ifdef GCC_COMPAT
if (attr_find(cftnsp->sap, GCC_ATYP_STDCALL) != NULL)
cftnsp->sflags |= SSTDCALL;
if ((ap = attr_find(cftnsp->sap, GCC_ATYP_REGPARM)))
regparmarg = ap->iarg(0);
#endif
/* Function returns struct, create return arg node */
if (cftnsp->stype == STRTY+FTN || cftnsp->stype == UNIONTY+FTN) {
{
if (regparmarg) {
n = block(REG, 0, 0, INT, 0, 0);
regno(n) = regpregs[nrarg++];
} else {
n = block(OREG, 0, 0, INT, 0, 0);
n->n_lval = argbase/SZCHAR;
argbase += SZINT;
regno(n) = FPREG;
}
p = tempnode(0, INT, 0, 0);
structrettemp = regno(p);
p = buildtree(ASSIGN, p, n);
ecomp(p);
}
}
/*
* Find where all params are so that they end up at the right place.
* At the same time recalculate their arg offset on stack.
* We also get the "pop size" for stdcall.
*/
for (i = 0; i < cnt; i++) {
sp2 = sp[i];
sz = tsize(sp2->stype, sp2->sdf, sp2->sap);
SETOFF(sz, SZINT);
if (cisreg(sp2->stype) == 0 ||
((regparmarg - nrarg) * SZINT < sz)) { /* not in reg */
sp2->soffset = argbase;
argbase += sz;
nrarg = regparmarg; /* no more in reg either */
} else { /* in reg */
sp2->soffset = nrarg;
nrarg += sz/SZINT;
sp2->sclass = REGISTER;
}
}
/*
* Now (argbase - ARGINIT) is used space on stack.
* Move (if necessary) the args to something new.
*/
for (i = 0; i < cnt; i++) {
int reg, j;
sp2 = sp[i];
if (ISSOU(sp2->stype) && sp2->sclass == REGISTER) {
/* must move to stack */
sz = tsize(sp2->stype, sp2->sdf, sp2->sap);
SETOFF(sz, SZINT);
SETOFF(autooff, SZINT);
reg = sp2->soffset;
sp2->sclass = AUTO;
sp2->soffset = NOOFFSET;
oalloc(sp2, &autooff);
for (j = 0; j < sz/SZCHAR; j += 4) {
p = block(OREG, 0, 0, INT, 0, 0);
p->n_lval = sp2->soffset/SZCHAR + j;
regno(p) = FPREG;
n = block(REG, 0, 0, INT, 0, 0);
regno(n) = regpregs[reg++];
p = block(ASSIGN, p, n, INT, 0, 0);
ecomp(p);
}
} else if (cisreg(sp2->stype) && !ISSOU(sp2->stype) &&
((cqual(sp2->stype, sp2->squal) & VOL) == 0)) {
/* just put rest in temps */
if (sp2->sclass == REGISTER) {
n = block(REG, 0, 0, sp2->stype,
sp2->sdf, sp2->sap);
if (ISLONGLONG(sp2->stype)|| sp2->stype == LONG || sp2->stype == ULONG)
regno(n) = longregs[sp2->soffset];
else if (DEUNSIGN(sp2->stype) == CHAR || sp2->stype == BOOL)
regno(n) = charregs[sp2->soffset];
else
regno(n) = regpregs[sp2->soffset];
} else {
n = block(OREG, 0, 0, sp2->stype,
sp2->sdf, sp2->sap);
n->n_lval = sp2->soffset/SZCHAR;
regno(n) = FPREG;
}
p = tempnode(0, sp2->stype, sp2->sdf, sp2->sap);
sp2->soffset = regno(p);
sp2->sflags |= STNODE;
n = buildtree(ASSIGN, p, n);
ecomp(n);
}
}
argstacksize = 0;
if (cftnsp->sflags & SSTDCALL) {
argstacksize = (argbase - ARGINIT)/SZCHAR;
}
}
/*
* 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 **s, int cnt)
{
union arglist *al;
struct symtab *sp;
NODE *p, *r;
TWORD t;
int i, rno, typ;
/* recalculate the arg offset and create TEMP moves */
/* Always do this for reg, even if not optimizing, to free arg regs */
nsse = ngpr = 0;
nrsp = ARGINIT;
if (cftnsp->stype == STRTY+FTN || cftnsp->stype == UNIONTY+FTN) {
sp = cftnsp;
if (argtyp(DECREF(sp->stype), sp->sdf, sp->sap) == STRMEM) {
r = block(REG, NIL, NIL, LONG, 0, 0);
regno(r) = argregsi[ngpr++];
p = tempnode(0, r->n_type, r->n_df, r->n_ap);
stroffset = regno(p);
ecomp(buildtree(ASSIGN, p, r));
}
}
for (i = 0; i < cnt; i++) {
sp = s[i];
if (sp == NULL)
continue; /* XXX when happens this? */
switch (typ = argtyp(sp->stype, sp->sdf, sp->sap)) {
case INTEGER:
case SSE:
if (typ == SSE)
rno = XMM0 + nsse++;
else
rno = argregsi[ngpr++];
r = block(REG, NIL, NIL, sp->stype, sp->sdf, sp->sap);
regno(r) = rno;
p = tempnode(0, sp->stype, sp->sdf, sp->sap);
sp->soffset = regno(p);
sp->sflags |= STNODE;
ecomp(buildtree(ASSIGN, p, r));
break;
case SSEMEM:
sp->soffset = nrsp;
nrsp += SZDOUBLE;
if (xtemps) {
p = tempnode(0, sp->stype, sp->sdf, sp->sap);
p = buildtree(ASSIGN, p, nametree(sp));
sp->soffset = regno(p->n_left);
sp->sflags |= STNODE;
ecomp(p);
}
break;
case INTMEM:
sp->soffset = nrsp;
nrsp += SZLONG;
if (xtemps) {
p = tempnode(0, sp->stype, sp->sdf, sp->sap);
p = buildtree(ASSIGN, p, nametree(sp));
sp->soffset = regno(p->n_left);
sp->sflags |= STNODE;
ecomp(p);
}
break;
case STRMEM: /* Struct in memory */
sp->soffset = nrsp;
nrsp += tsize(sp->stype, sp->sdf, sp->sap);
break;
case X87: /* long double args */
sp->soffset = nrsp;
nrsp += SZLDOUBLE;
break;
case STRCPX:
case STRREG: /* Struct in register */
/* Allocate space on stack for the struct */
/* For simplicity always fetch two longwords */
autooff += (2*SZLONG);
if (typ == STRCPX) {
t = DOUBLE;
rno = XMM0 + nsse++;
} else {
t = LONG;
rno = argregsi[ngpr++];
}
r = block(REG, NIL, NIL, t, 0, 0);
regno(r) = rno;
ecomp(movtomem(r, -autooff, FPREG));
if (tsize(sp->stype, sp->sdf, sp->sap) > SZLONG) {
r = block(REG, NIL, NIL, t, 0, 0);
regno(r) = (typ == STRCPX ?
XMM0 + nsse++ : argregsi[ngpr++]);
ecomp(movtomem(r, -autooff+SZLONG, FPREG));
}
sp->soffset = -autooff;
break;
default:
cerror("bfcode: %d", typ);
}
}
/* Check if there are varargs */
if (cftnsp->sdf == NULL || cftnsp->sdf->dfun == NULL)
return; /* no prototype */
al = cftnsp->sdf->dfun;
for (; al->type != TELLIPSIS; al++) {
t = al->type;
if (t == TNULL)
return;
if (ISSOU(BTYPE(t)))
al++;
for (i = 0; t > BTMASK; t = DECREF(t))
if (ISARY(t) || ISFTN(t))
i++;
if (i)
al++;
}
/* fix stack offset */
SETOFF(autooff, ALMAX);
/* Save reg arguments in the reg save area */
p = NIL;
for (i = ngpr; i < 6; i++) {
r = block(REG, NIL, NIL, LONG, 0, 0);
regno(r) = argregsi[i];
r = movtomem(r, -RSALONGOFF(i)-autooff, FPREG);
p = (p == NIL ? r : block(COMOP, p, r, INT, 0, 0));
}
for (i = nsse; i < 8; i++) {
r = block(REG, NIL, NIL, DOUBLE, 0, 0);
regno(r) = i + XMM0;
r = movtomem(r, -RSADBLOFF(i)-autooff, FPREG);
p = (p == NIL ? r : block(COMOP, p, r, INT, 0, 0));
}
autooff += RSASZ;
rsaoff = autooff;
thissse = nsse;
thisgpr = ngpr;
thisrsp = nrsp;
ecomp(p);
}