/* Classify a C type. */
static void ccall_classify_ct(CTState *cts, CType *ct, int *rcl, CTSize ofs)
{
if (ctype_isarray(ct->info)) {
CType *cct = ctype_rawchild(cts, ct);
CTSize eofs, esz = cct->size, asz = ct->size;
for (eofs = 0; eofs < asz; eofs += esz)
ccall_classify_ct(cts, cct, rcl, ofs+eofs);
} else if (ctype_isstruct(ct->info)) {
ccall_classify_struct(cts, ct, rcl, ofs);
} else {
int cl = ctype_isfp(ct->info) ? CCALL_RCL_SSE : CCALL_RCL_INT;
lua_assert(ctype_hassize(ct->info));
if ((ofs & (ct->size-1))) cl = CCALL_RCL_MEM; /* Unaligned. */
rcl[(ofs >= 8)] |= cl;
}
}
/* Classify a struct based on its fields. */
static unsigned int ccall_classify_struct(CTState *cts, CType *ct, CType *ctf)
{
CTSize sz = ct->size;
unsigned int r = 0, n = 0, isu = (ct->info & CTF_UNION);
if ((ctf->info & CTF_VARARG)) goto noth;
while (ct->sib) {
ct = ctype_get(cts, ct->sib);
if (ctype_isfield(ct->info)) {
CType *sct = ctype_rawchild(cts, ct);
if (ctype_isfp(sct->info)) {
r |= sct->size;
if (!isu) n++; else if (n == 0) n = 1;
} else if (ctype_iscomplex(sct->info)) {
r |= (sct->size >> 1);
if (!isu) n += 2; else if (n < 2) n = 2;
} else {
goto noth;
/* Check for struct with single FP field. */
static int ccall_classify_struct(CTState *cts, CType *ct)
{
CTSize sz = ct->size;
if (!(sz == sizeof(float) || sz == sizeof(double))) return 0;
if ((ct->info & CTF_UNION)) return 0;
while (ct->sib) {
ct = ctype_get(cts, ct->sib);
if (ctype_isfield(ct->info)) {
CType *sct = ctype_rawchild(cts, ct);
if (ctype_isfp(sct->info)) {
if (sct->size == sz)
return (sz >> 2); /* Return 1 for float or 2 for double. */
} else if (ctype_isstruct(sct->info)) {
if (sct->size)
return ccall_classify_struct(cts, sct);
} else {
break;
}
} else if (ctype_isbitfield(ct->info)) {
/* Infer the destination CTypeID for a vararg argument. */
static CTypeID ccall_ctid_vararg(CTState *cts, cTValue *o)
{
if (tvisnumber(o)) {
return CTID_DOUBLE;
} else if (tviscdata(o)) {
CTypeID id = cdataV(o)->typeid;
CType *s = ctype_get(cts, id);
if (ctype_isrefarray(s->info)) {
return lj_ctype_intern(cts,
CTINFO(CT_PTR, CTALIGN_PTR|ctype_cid(s->info)), CTSIZE_PTR);
} else if (ctype_isstruct(s->info) || ctype_isfunc(s->info)) {
/* NYI: how to pass a struct by value in a vararg argument? */
return lj_ctype_intern(cts, CTINFO(CT_PTR, CTALIGN_PTR|id), CTSIZE_PTR);
} if (ctype_isfp(s->info) && s->size == sizeof(float)) {
return CTID_DOUBLE;
} else {
return id;
}
} else if (tvisstr(o)) {
