/* clocal() is called to do local transformations on
* an expression tree preparitory to its being
* written out in intermediate code.
*
* the major essential job is rewriting the
* automatic variables and arguments in terms of
* REG and OREG nodes
* conversion ops which are not necessary are also clobbered here
* in addition, any special features (such as rewriting
* exclusive or) are easily handled here as well
*/
NODE *
clocal(NODE *p)
{
register struct symtab *q;
register NODE *r, *l;
register int o;
register int m;
TWORD t;
#ifdef PCC_DEBUG
if (xdebug) {
printf("clocal: %p\n", p);
fwalk(p, eprint, 0);
}
#endif
switch( o = p->n_op ){
case NAME:
if ((q = p->n_sp) == NULL)
return p; /* Nothing to care about */
switch (q->sclass) {
case PARAM:
case AUTO:
/* fake up a structure reference */
r = block(REG, NIL, NIL, PTR+STRTY, 0, 0);
slval(r, 0);
r->n_rval = FPREG;
p = stref(block(STREF, r, p, 0, 0, 0));
break;
case USTATIC:
if (kflag == 0)
break;
/* FALLTHROUGH */
case STATIC:
#ifdef TLS
if (q->sflags & STLS) {
p = tlsref(p);
break;
}
#endif
break;
case REGISTER:
p->n_op = REG;
slval(p, 0);
p->n_rval = q->soffset;
break;
case EXTERN:
case EXTDEF:
if (q->sflags & STLS) {
p = tlsref(p);
break;
}
if (kflag == 0 || statinit)
break;
if (blevel > 0)
p = picext(p);
break;
}
break;
case UCALL:
case USTCALL:
/* For now, always clear eax */
l = block(REG, NIL, NIL, INT, 0, 0);
regno(l) = RAX;
p->n_right = clocal(buildtree(ASSIGN, l, bcon(0)));
p->n_op -= (UCALL-CALL);
break;
case SCONV:
/* Special-case shifts */
if (p->n_type == LONG && (l = p->n_left)->n_op == LS &&
l->n_type == INT && l->n_right->n_op == ICON) {
p->n_left = l->n_left;
p = buildtree(LS, p, l->n_right);
nfree(l);
break;
}
l = p->n_left;
/* Float conversions may need extra casts */
if (p->n_type == FLOAT || p->n_type == DOUBLE ||
p->n_type == LDOUBLE) {
if (l->n_type < INT || l->n_type == BOOL) {
p->n_left = block(SCONV, l, NIL,
ISUNSIGNED(l->n_type) ? UNSIGNED : INT,
l->n_df, l->n_ap);
break;
}
}
if (p->n_type == l->n_type) {
nfree(p);
return l;
}
if ((p->n_type & TMASK) == 0 && (l->n_type & TMASK) == 0 &&
tsize(p->n_type, p->n_df, p->n_ap) ==
tsize(l->n_type, l->n_df, l->n_ap)) {
if (p->n_type != FLOAT && p->n_type != DOUBLE &&
l->n_type != FLOAT && l->n_type != DOUBLE &&
l->n_type != LDOUBLE && p->n_type != LDOUBLE) {
if (l->n_op == NAME || l->n_op == UMUL ||
l->n_op == TEMP) {
l->n_type = p->n_type;
nfree(p);
return l;
}
}
}
if (DEUNSIGN(p->n_type) == INT && DEUNSIGN(l->n_type) == INT &&
coptype(l->n_op) == BITYPE && l->n_op != COMOP &&
l->n_op != QUEST && l->n_op != ASSIGN) {
l->n_type = p->n_type;
nfree(p);
return l;
}
o = l->n_op;
m = p->n_type;
if (o == ICON) {
CONSZ val = glval(l);
/* if named constant and pointer, allow cast
to long/ulong */
if (!nncon(l) && (l->n_type & TMASK) &&
(m == LONG || m == ULONG)) {
l->n_type = m;
l->n_ap = 0;
return nfree(p);
}
if (ISPTR(l->n_type) && !nncon(l))
break; /* cannot convert named pointers */
if (!ISPTR(m)) /* Pointers don't need to be conv'd */
switch (m) {
case BOOL:
val = nncon(l) ? (val != 0) : 1;
slval(l, val);
l->n_sp = NULL;
break;
case CHAR:
slval(l, (char)val);
break;
case UCHAR:
slval(l, val & 0377);
break;
case SHORT:
slval(l, (short)val);
break;
case USHORT:
slval(l, val & 0177777);
break;
case UNSIGNED:
slval(l, val & 0xffffffff);
break;
case INT:
slval(l, (int)val);
break;
case LONG:
case LONGLONG:
slval(l, (long long)val);
break;
case ULONG:
case ULONGLONG:
slval(l, val);
break;
case VOID:
break;
case LDOUBLE:
case DOUBLE:
case FLOAT:
l->n_op = FCON;
l->n_dcon = fltallo();
FCAST(l->n_dcon)->fp = val;
break;
default:
cerror("unknown type %d", m);
}
l->n_type = m;
l->n_ap = NULL;
nfree(p);
return l;
} else if (l->n_op == FCON) {
CONSZ lv;
if (p->n_type == BOOL)
lv = !FLOAT_ISZERO(FCAST(l->n_dcon));
else {
FLOAT_FP2INT(lv, FCAST(l->n_dcon), m);
}
slval(l, lv);
l->n_sp = NULL;
l->n_op = ICON;
l->n_type = m;
l->n_ap = NULL;
nfree(p);
return clocal(l);
}
if ((p->n_type == CHAR || p->n_type == UCHAR ||
p->n_type == SHORT || p->n_type == USHORT) &&
(l->n_type == FLOAT || l->n_type == DOUBLE ||
l->n_type == LDOUBLE)) {
p = block(SCONV, p, NIL, p->n_type, p->n_df, p->n_ap);
p->n_left->n_type = INT;
return p;
}
break;
case MOD:
case DIV:
if (o == DIV && p->n_type != CHAR && p->n_type != SHORT)
break;
if (o == MOD && p->n_type != CHAR && p->n_type != SHORT)
break;
/* make it an int division by inserting conversions */
p->n_left = makety(p->n_left, INT, 0, 0, 0);
p->n_right = makety(p->n_right, INT, 0, 0, 0);
p = makety(p, p->n_type, 0, 0, 0);
p->n_left->n_type = INT;
break;
case FORCE:
/* put return value in return reg */
p->n_op = ASSIGN;
p->n_right = p->n_left;
p->n_left = block(REG, NIL, NIL, p->n_type, 0, 0);
t = p->n_type;
if (ISITY(t))
t = t - (FIMAG-FLOAT);
p->n_left->n_rval = p->n_left->n_type == BOOL ?
RETREG(CHAR) : RETREG(t);
break;
case LS:
case RS:
/* shift count must be in a char */
if (p->n_right->n_type == CHAR || p->n_right->n_type == UCHAR)
break;
p->n_right = makety(p->n_right, CHAR, 0, 0, 0);
break;
}
#ifdef PCC_DEBUG
if (xdebug) {
printf("clocal end: %p\n", p);
fwalk(p, eprint, 0);
}
#endif
return(p);
}
/* clocal() is called to do local transformations on
* an expression tree preparitory to its being
* written out in intermediate code.
*
* the major essential job is rewriting the
* automatic variables and arguments in terms of
* REG and OREG nodes
* conversion ops which are not necessary are also clobbered here
* in addition, any special features (such as rewriting
* exclusive or) are easily handled here as well
*/
NODE *
clocal(NODE *p)
{
register struct symtab *q;
register NODE *r, *l;
register int o;
TWORD t;
#ifdef PCC_DEBUG
if (xdebug) {
printf("clocal: %p\n", p);
fwalk(p, eprint, 0);
}
#endif
switch( o = p->n_op ){
case NAME:
if ((q = p->n_sp) == NULL)
return p; /* Nothing to care about */
switch (q->sclass) {
case PARAM:
case AUTO:
/* fake up a structure reference */
r = block(REG, NIL, NIL, PTR+STRTY, 0, 0);
slval(r, 0);
r->n_rval = FPREG;
p = stref(block(STREF, r, p, 0, 0, 0));
break;
case REGISTER:
p->n_op = REG;
slval(p, 0);
p->n_rval = q->soffset;
break;
case USTATIC:
case STATIC:
if (kflag == 0)
break;
if (blevel > 0 && !statinit)
p = picstatic(p);
break;
case EXTERN:
case EXTDEF:
if (kflag == 0)
break;
if (blevel > 0 && !statinit)
p = picext(p);
break;
}
break;
case ADDROF:
if (kflag == 0 || blevel == 0 || statinit)
break;
/* char arrays may end up here */
l = p->n_left;
if (l->n_op != NAME ||
(l->n_type != ARY+CHAR && l->n_type != ARY+WCHAR_TYPE))
break;
l = p;
p = picstatic(p->n_left);
nfree(l);
if (p->n_op != UMUL)
cerror("ADDROF error");
l = p;
p = p->n_left;
nfree(l);
break;
case STASG: /* convert struct assignment to call memcpy */
l = p->n_left;
if (l->n_op == NAME && ISFTN(l->n_sp->stype))
break; /* struct return, do nothing */
/* first construct arg list */
p->n_left = buildtree(ADDROF, p->n_left, 0);
r = bcon(tsize(STRTY, p->n_df, p->n_ap)/SZCHAR);
p->n_left = buildtree(CM, p->n_left, p->n_right);
p->n_right = r;
p->n_op = CM;
p->n_type = INT;
r = block(NAME, NIL, NIL, INT, 0, 0);
r->n_sp = lookup(addname("memcpy"), SNORMAL);
if (r->n_sp->sclass == SNULL) {
r->n_sp->sclass = EXTERN;
r->n_sp->stype = INCREF(VOID+PTR)+(FTN-PTR);
}
r->n_type = r->n_sp->stype;
p = buildtree(CALL, r, p);
break;
case SCONV:
l = p->n_left;
if (l->n_op == ICON && ISPTR(l->n_type)) {
/* Do immediate cast here */
/* Should be common code */
q = l->n_sp;
l->n_sp = NULL;
l->n_type = UNSIGNED;
if (concast(l, p->n_type) == 0)
cerror("clocal");
p = nfree(p);
p->n_sp = q;
}
break;
case FORCE:
/* put return value in return reg */
p->n_op = ASSIGN;
p->n_right = p->n_left;
p->n_left = block(REG, NIL, NIL, p->n_type, 0, 0);
t = p->n_type;
if (ISITY(t))
t = t - (FIMAG-FLOAT);
p->n_left->n_rval = RETREG(t);
break;
}
#ifdef PCC_DEBUG
if (xdebug) {
printf("clocal end: %p\n", p);
fwalk(p, eprint, 0);
}
#endif
return(p);
}
