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 *);
}
}
int
objc_promoted_size (const char *type)
{
int size, wordsize;
type = objc_skip_variable_name (type);
size = objc_sizeof_type (type);
wordsize = sizeof (void *);
return ROUND (size, wordsize);
}
int
objc_aligned_size (const char *type)
{
int size, align;
type = objc_skip_variable_name (type);
size = objc_sizeof_type (type);
align = objc_alignof_type (type);
return ROUND (size, align);
}
/* Given a selector, return the proper forwarding implementation. */
__inline__
IMP
__objc_get_forward_imp (SEL sel)
{
const char *t = sel->sel_types;
if (t && (*t == '[' || *t == '(' || *t == '{')
#ifdef OBJC_MAX_STRUCT_BY_VALUE
&& objc_sizeof_type(t) > OBJC_MAX_STRUCT_BY_VALUE
#endif
)
return (IMP)__objc_block_forward;
else if (t && (*t == 'f' || *t == 'd'))
return (IMP)__objc_double_forward;
else
return (IMP)__objc_word_forward;
}
int
objc_promoted_size (const char* type)
{
int size, wordsize;
/* Skip the variable name */
if (*type == '"')
{
for (type++; *type++ != '"';)
/* do nothing */;
}
size = objc_sizeof_type (type);
wordsize = sizeof (void*);
return ROUND (size, wordsize);
}
int
objc_aligned_size (const char* type)
{
int size, align;
/* Skip the variable name */
if (*type == '"')
{
for (type++; *type++ != '"';)
/* do nothing */;
}
size = objc_sizeof_type (type);
align = objc_alignof_type (type);
return ROUND (size, align);
}
/* Given a selector, return the proper forwarding implementation. */
IMP
__objc_get_forward_imp (id rcv, SEL sel)
{
/* If a custom forwarding hook was registered, try getting a
forwarding function from it. There are two forward routine hooks,
one that takes the receiver as an argument and one that does
not. */
if (__objc_msg_forward2)
{
IMP result;
if ((result = __objc_msg_forward2 (rcv, sel)) != NULL)
return result;
}
if (__objc_msg_forward)
{
IMP result;
if ((result = __objc_msg_forward (sel)) != NULL)
return result;
}
/* In all other cases, use the default forwarding functions built
using __builtin_apply and friends. */
{
const char *t = sel->sel_types;
if (t && (*t == '[' || *t == '(' || *t == '{')
#ifdef OBJC_MAX_STRUCT_BY_VALUE
&& objc_sizeof_type (t) > OBJC_MAX_STRUCT_BY_VALUE
#endif
)
return (IMP)__objc_block_forward;
else if (t && (*t == 'f' || *t == 'd'))
return (IMP)__objc_double_forward;
else
return (IMP)__objc_word_forward;
}
}
BOOL
objc_layout_structure_next_member (struct objc_struct_layout *layout)
{
register int desired_align = 0;
/* The following are used only if the field is a bitfield */
register const char *bfld_type = 0;
register int bfld_type_align = 0, bfld_field_size = 0;
/* The current type without the type qualifiers */
const char *type;
BOOL unionp = layout->original_type[-1] == _C_UNION_B;
/* Add the size of the previous field to the size of the record. */
if (layout->prev_type)
{
type = objc_skip_type_qualifiers (layout->prev_type);
if (unionp)
layout->record_size = MAX (layout->record_size,
objc_sizeof_type (type) * BITS_PER_UNIT);
else if (*type != _C_BFLD)
layout->record_size += objc_sizeof_type (type) * BITS_PER_UNIT;
else {
/* Get the bitfield's type */
for (bfld_type = type + 1;
isdigit ((unsigned char)*bfld_type);
bfld_type++)
/* do nothing */;
bfld_type_align = objc_alignof_type (bfld_type) * BITS_PER_UNIT;
bfld_field_size = atoi (objc_skip_typespec (bfld_type));
layout->record_size += bfld_field_size;
}
}
if ((unionp && *layout->type == _C_UNION_E)
|| (!unionp && *layout->type == _C_STRUCT_E))
return NO;
/* Skip the variable name if any */
layout->type = objc_skip_variable_name (layout->type);
type = objc_skip_type_qualifiers (layout->type);
if (*type != _C_BFLD)
desired_align = objc_alignof_type (type) * BITS_PER_UNIT;
else
{
desired_align = 1;
/* Skip the bitfield's offset */
for (bfld_type = type + 1;
isdigit ((unsigned char) *bfld_type);
bfld_type++)
/* do nothing */;
bfld_type_align = objc_alignof_type (bfld_type) * BITS_PER_UNIT;
bfld_field_size = atoi (objc_skip_typespec (bfld_type));
}
/* The following won't work for vectors. */
#ifdef BIGGEST_FIELD_ALIGNMENT
desired_align = MIN (desired_align, BIGGEST_FIELD_ALIGNMENT);
#endif
#ifdef ADJUST_FIELD_ALIGN
desired_align = ADJUST_FIELD_ALIGN (type, desired_align);
#endif
/* Record must have at least as much alignment as any field.
Otherwise, the alignment of the field within the record
is meaningless. */
#ifndef HAVE_BITFIELD_TYPE_MATTERS
layout->record_align = MAX (layout->record_align, desired_align);
#else /* PCC_BITFIELD_TYPE_MATTERS */
if (*type == _C_BFLD)
{
/* For these machines, a zero-length field does not
affect the alignment of the structure as a whole.
It does, however, affect the alignment of the next field
within the structure. */
if (bfld_field_size)
layout->record_align = MAX (layout->record_align, desired_align);
else
desired_align = objc_alignof_type (bfld_type) * BITS_PER_UNIT;
/* A named bit field of declared type `int'
forces the entire structure to have `int' alignment.
Q1: How is encoded this thing and how to check for it?
Q2: How to determine maximum_field_alignment at runtime? */
/* if (DECL_NAME (field) != 0) */
{
int type_align = bfld_type_align;
#if 0
if (maximum_field_alignment != 0)
type_align = MIN (type_align, maximum_field_alignment);
else if (DECL_PACKED (field))
type_align = MIN (type_align, BITS_PER_UNIT);
#endif
layout->record_align = MAX (layout->record_align, type_align);
}
}
else
layout->record_align = MAX (layout->record_align, desired_align);
#endif /* PCC_BITFIELD_TYPE_MATTERS */
/* Does this field automatically have alignment it needs
by virtue of the fields that precede it and the record's
own alignment? */
if (*type == _C_BFLD)
layout->record_size = atoi (type + 1);
else if (layout->record_size % desired_align != 0)
{
/* No, we need to skip space before this field.
Bump the cumulative size to multiple of field alignment. */
layout->record_size = ROUND (layout->record_size, desired_align);
}
/* Jump to the next field in record. */
layout->prev_type = layout->type;
layout->type = objc_skip_typespec (layout->type); /* skip component */
return YES;
}
int
objc_sizeof_type (const char* type)
{
/* Skip the variable name if any */
if (*type == '"')
{
for (type++; *type++ != '"';)
/* do nothing */;
}
switch(*type) {
case _C_ID:
return sizeof(id);
break;
case _C_CLASS:
return sizeof(Class);
break;
case _C_SEL:
return sizeof(SEL);
break;
case _C_CHR:
return sizeof(char);
break;
case _C_UCHR:
return sizeof(unsigned char);
break;
case _C_SHT:
return sizeof(short);
break;
case _C_USHT:
return sizeof(unsigned short);
break;
case _C_INT:
return sizeof(int);
break;
case _C_UINT:
return sizeof(unsigned int);
break;
case _C_LNG:
return sizeof(long);
break;
case _C_ULNG:
return sizeof(unsigned long);
break;
case _C_LNG_LNG:
return sizeof(long long);
break;
case _C_ULNG_LNG:
return sizeof(unsigned long long);
break;
case _C_FLT:
return sizeof(float);
break;
case _C_DBL:
return sizeof(double);
break;
case _C_VOID:
return sizeof(void);
break;
case _C_PTR:
case _C_ATOM:
case _C_CHARPTR:
return sizeof(char*);
break;
case _C_ARY_B:
{
int len = atoi(type+1);
while (isdigit(*++type));
return len*objc_aligned_size (type);
}
break;
case _C_BFLD:
{
/* The new encoding of bitfields is: b 'position' 'type' 'size' */
int position, size;
int startByte, endByte;
position = atoi (type + 1);
while (isdigit (*++type));
size = atoi (type + 1);
startByte = position / BITS_PER_UNIT;
endByte = (position + size) / BITS_PER_UNIT;
return endByte - startByte;
}
case _C_STRUCT_B:
{
struct objc_struct_layout layout;
unsigned int size;
objc_layout_structure (type, &layout);
while (objc_layout_structure_next_member (&layout))
/* do nothing */ ;
objc_layout_finish_structure (&layout, &size, NULL);
return size;
}
case _C_UNION_B:
{
int max_size = 0;
while (*type != _C_UNION_E && *type++ != '=') /* do nothing */;
while (*type != _C_UNION_E)
{
/* Skip the variable name if any */
if (*type == '"')
{
for (type++; *type++ != '"';)
/* do nothing */;
}
max_size = MAX (max_size, objc_sizeof_type (type));
type = objc_skip_typespec (type);
}
return max_size;
}
default:
{
objc_error(nil, OBJC_ERR_BAD_TYPE, "unknown type %s\n", type);
return 0;
}
}
}
