/* The following three functions can be used to determine how a
structure is laid out by the compiler. For example:
struct objc_struct_layout layout;
int i;
objc_layout_structure (type, &layout);
while (objc_layout_structure_next_member (&layout))
{
int position, align;
const char *type;
objc_layout_structure_get_info (&layout, &position, &align, &type);
printf ("element %d has offset %d, alignment %d\n",
i++, position, align);
}
These functions are used by objc_sizeof_type and objc_alignof_type
functions to compute the size and alignment of structures. The
previous method of computing the size and alignment of a structure
was not working on some architectures, particulary on AIX, and in
the presence of bitfields inside the structure. */
void
objc_layout_structure (const char *type,
struct objc_struct_layout *layout)
{
const char *ntype;
if (*type++ != _C_STRUCT_B)
{
objc_error(nil, OBJC_ERR_BAD_TYPE,
"record type expected in objc_layout_structure, got %s\n",
type);
}
layout->original_type = type;
/* Skip "<name>=" if any. Avoid embedded structures and unions. */
ntype = type;
while (*ntype != _C_STRUCT_E && *ntype != _C_STRUCT_B && *ntype != _C_UNION_B
&& *ntype++ != '=')
/* do nothing */;
/* If there's a "<name>=", ntype - 1 points to '='; skip the the name */
if (*(ntype - 1) == '=')
type = ntype;
layout->type = type;
layout->prev_type = NULL;
layout->record_size = 0;
layout->record_align = BITS_PER_UNIT;
layout->record_align = MAX (layout->record_align, STRUCTURE_SIZE_BOUNDARY);
}
void *
objc_atomic_malloc(size_t size)
{
void* res = (void*) (*_objc_atomic_malloc)(size);
if(!res)
objc_error(nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
return res;
}
static void *GC_calloc (size_t nelem, size_t size)
{
void* p = GC_malloc (nelem * size);
if (!p)
objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted!\n");
memset (p, 0, nelem * size);
return p;
}
static volatile void
__objc_thread_detach_function(struct __objc_thread_start_state *istate)
{
/* Valid state? */
if (istate) {
id (*imp)(id,SEL,id);
SEL selector = istate->selector;
id object = istate->object;
id argument = istate->argument;
/* Don't need anymore so free it */
objc_free(istate);
/* Clear out the thread local storage */
objc_thread_set_data(NULL);
/* Check to see if we just became multi threaded */
if (!__objc_is_multi_threaded)
{
__objc_is_multi_threaded = 1;
/* Call the hook function */
if (_objc_became_multi_threaded != NULL)
(*_objc_became_multi_threaded)();
}
/* Call the method */
if ((imp = (id(*)(id, SEL, id))objc_msg_lookup(object, selector)))
(*imp)(object, selector, argument);
else
objc_error(object, OBJC_ERR_UNIMPLEMENTED,
"objc_thread_detach called with bad selector.\n");
}
else
objc_error(nil, OBJC_ERR_BAD_STATE,
"objc_thread_detach called with NULL state.\n");
/* Exit the thread */
objc_thread_exit();
}
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;
}
}
}
const char*
objc_skip_typespec (const char* type)
{
/* Skip the variable name if any */
if (*type == '"')
{
for (type++; *type++ != '"';)
/* do nothing */;
}
type = objc_skip_type_qualifiers (type);
switch (*type) {
case _C_ID:
/* An id may be annotated by the actual type if it is known
with the @"ClassName" syntax */
if (*++type != '"')
return type;
else
{
while (*++type != '"') /* do nothing */;
return type + 1;
}
/* The following are one character type codes */
case _C_CLASS:
case _C_SEL:
case _C_CHR:
case _C_UCHR:
case _C_CHARPTR:
case _C_ATOM:
case _C_SHT:
case _C_USHT:
case _C_INT:
case _C_UINT:
case _C_LNG:
case _C_ULNG:
case _C_LNG_LNG:
case _C_ULNG_LNG:
case _C_FLT:
case _C_DBL:
case _C_VOID:
case _C_UNDEF:
return ++type;
break;
case _C_ARY_B:
/* skip digits, typespec and closing ']' */
while(isdigit(*++type));
type = objc_skip_typespec(type);
if (*type == _C_ARY_E)
return ++type;
else
{
objc_error(nil, OBJC_ERR_BAD_TYPE, "bad array type %s\n", type);
return 0;
}
case _C_BFLD:
/* The new encoding of bitfields is: b 'position' 'type' 'size' */
while (isdigit (*++type)); /* skip position */
while (isdigit (*++type)); /* skip type and size */
return type;
case _C_STRUCT_B:
/* skip name, and elements until closing '}' */
while (*type != _C_STRUCT_E && *type++ != '=');
while (*type != _C_STRUCT_E) { type = objc_skip_typespec (type); }
return ++type;
case _C_UNION_B:
/* skip name, and elements until closing ')' */
while (*type != _C_UNION_E && *type++ != '=');
while (*type != _C_UNION_E) { type = objc_skip_typespec (type); }
return ++type;
case _C_PTR:
/* Just skip the following typespec */
return objc_skip_typespec (++type);
default:
{
objc_error(nil, OBJC_ERR_BAD_TYPE, "unknown type %s\n", type);
return 0;
}
}
}
int
objc_alignof_type(const char* type)
{
/* Skip the variable name if any */
if (*type == '"')
{
for (type++; *type++ != '"';)
/* do nothing */;
}
switch(*type) {
case _C_ID:
return __alignof__(id);
break;
case _C_CLASS:
return __alignof__(Class);
break;
case _C_SEL:
return __alignof__(SEL);
break;
case _C_CHR:
return __alignof__(char);
break;
case _C_UCHR:
return __alignof__(unsigned char);
break;
case _C_SHT:
return __alignof__(short);
break;
case _C_USHT:
return __alignof__(unsigned short);
break;
case _C_INT:
return __alignof__(int);
break;
case _C_UINT:
return __alignof__(unsigned int);
break;
case _C_LNG:
return __alignof__(long);
break;
case _C_ULNG:
return __alignof__(unsigned long);
break;
case _C_LNG_LNG:
return __alignof__(long long);
break;
case _C_ULNG_LNG:
return __alignof__(unsigned long long);
break;
case _C_FLT:
return __alignof__(float);
break;
case _C_DBL:
return __alignof__(double);
break;
case _C_PTR:
case _C_ATOM:
case _C_CHARPTR:
return __alignof__(char*);
break;
case _C_ARY_B:
while (isdigit(*++type)) /* do nothing */;
return objc_alignof_type (type);
case _C_STRUCT_B:
{
struct objc_struct_layout layout;
unsigned int align;
objc_layout_structure (type, &layout);
while (objc_layout_structure_next_member (&layout))
/* do nothing */;
objc_layout_finish_structure (&layout, NULL, &align);
return align;
}
case _C_UNION_B:
{
int maxalign = 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 */;
}
maxalign = MAX (maxalign, objc_alignof_type (type));
type = objc_skip_typespec (type);
}
return maxalign;
}
default:
{
objc_error(nil, OBJC_ERR_BAD_TYPE, "unknown type %s\n", type);
return 0;
}
}
}
