static void
__objc_gc_setup_union (GC_bitmap mask, const char *type, int offset)
{
/* Sub-optimal, quick implementation: assume the union is made of
pointers, set up the mask accordingly. */
int i, size, align;
/* Skip the variable name */
if (*type == '"')
{
for (type++; *type++ != '"';)
/* do nothing */;
}
size = objc_sizeof_type (type);
align = objc_alignof_type (type);
offset = ROUND (offset, align);
for (i = 0; i < size; i += sizeof (void *))
{
SET_BIT_FOR_OFFSET (mask, offset);
offset += sizeof (void *);
}
}
static void
__objc_gc_setup_struct (GC_bitmap mask, const char *type, int offset)
{
struct objc_struct_layout layout;
unsigned int position;
const char *mtype;
objc_layout_structure (type, &layout);
while (objc_layout_structure_next_member (&layout))
{
BOOL gc_invisible = NO;
objc_layout_structure_get_info (&layout, &position, NULL, &mtype);
/* Skip the variable name */
if (*mtype == '"')
{
for (mtype++; *mtype++ != '"';)
/* do nothing */;
}
if (*mtype == _C_GCINVISIBLE)
{
gc_invisible = YES;
mtype++;
}
/* Add to position the offset of this structure */
position += offset;
switch (*mtype) {
case _C_ID:
case _C_CLASS:
case _C_SEL:
case _C_PTR:
case _C_CHARPTR:
case _C_ATOM:
if (! gc_invisible)
SET_BIT_FOR_OFFSET (mask, position);
break;
case _C_ARY_B:
__objc_gc_setup_array (mask, mtype, position);
break;
case _C_STRUCT_B:
__objc_gc_setup_struct (mask, mtype, position);
break;
case _C_UNION_B:
__objc_gc_setup_union (mask, mtype, position);
break;
default:
break;
}
}
}
/* Iterates over the types in the structure that represents the class
encoding and sets the bits in mask according to each ivar type. */
static void
__objc_gc_type_description_from_type (GC_bitmap mask, const char *type)
{
struct objc_struct_layout layout;
unsigned int offset, align;
const char *ivar_type;
objc_layout_structure (type, &layout);
while (objc_layout_structure_next_member (&layout))
{
BOOL gc_invisible = NO;
objc_layout_structure_get_info (&layout, &offset, &align, &ivar_type);
/* Skip the variable name */
if (*ivar_type == '"')
{
for (ivar_type++; *ivar_type++ != '"';)
/* do nothing */;
}
if (*ivar_type == _C_GCINVISIBLE)
{
gc_invisible = YES;
ivar_type++;
}
switch (*ivar_type) {
case _C_ID:
case _C_CLASS:
case _C_SEL:
case _C_PTR:
case _C_CHARPTR:
if (! gc_invisible)
SET_BIT_FOR_OFFSET (mask, offset);
break;
case _C_ARY_B:
__objc_gc_setup_array (mask, ivar_type, offset);
break;
case _C_STRUCT_B:
__objc_gc_setup_struct (mask, ivar_type, offset);
break;
case _C_UNION_B:
__objc_gc_setup_union (mask, ivar_type, offset);
break;
default:
break;
}
}
}
static void __tour_gc_setup_struct(GC_bitmap mask, const char* type, int offset)
{
struct tour_struct_layout layout;
unsigned int position;
const char* mtype;
tour_layout_structure( type, &layout );
while ( tour_layout_structure_next_member( &layout ) ) {
boolean gc_invisible = false;
tour_layout_structure_get_info( &layout, &position, NULL, &mtype );
if ( *mtype == '"' ) {
for ( mtype ++; *mtype ++ != '"'; ) /* do nothing */;
}
if ( *mtype == _C_GC_INVISIBLE ) {
gc_invisible = true;
mtype ++;
}
position += offset;
switch ( *mtype ) {
case _C_ID:
case _C_CLASS:
case _C_SEL:
case _C_PTR:
case _C_CHARPTR:
case _C_ATOM:
if ( !gc_invisible )
SET_BIT_FOR_OFFSET(mask, position);
break;
case _C_ARY_B:
__tour_gc_setup_array( mask, mtype, position );
break;
case _C_STRUCT_B:
__tour_gc_setup_struct( mask, mtype, position );
break;
case _C_UNION_B:
__tour_gc_setup_union( mask, mtype, position );
break;
default:
break;
}
}
}
static void __tour_gc_setup_union(GC_bitmap mask, const char* type, int offset)
{
int i, size, align;
if ( *type == '"' ) {
for ( type ++; *type ++ != '"'; ) /* do nothing */;
}
size = tour_sizeof_type( type );
align = tour_alignof_type( type );
offset = ROUND(offset, align);
for ( i = 0; i < size; i += sizeof(void *) ) {
SET_BIT_FOR_OFFSET( mask, offset );
offset += sizeof(void *);
}
}
