383 lines
9.4 KiB
C
383 lines
9.4 KiB
C
/* GNU Objective C Runtime ivar related functions.
|
|
Copyright (C) 2010 Free Software Foundation, Inc.
|
|
Contributed by Nicola Pero
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the Free Software
|
|
Foundation; either version 3, or (at your option) any later version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
|
details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "objc-private/common.h"
|
|
#include "objc/runtime.h"
|
|
#include "objc-private/module-abi-8.h" /* For runtime structures */
|
|
#include "objc/thr.h"
|
|
#include "objc-private/runtime.h" /* the kitchen sink */
|
|
#include <string.h> /* For strcmp */
|
|
|
|
struct objc_ivar *
|
|
class_getInstanceVariable (Class class_, const char *name)
|
|
{
|
|
if (class_ != Nil && name != NULL && ! CLS_IS_IN_CONSTRUCTION (class_))
|
|
{
|
|
while (class_ != Nil)
|
|
{
|
|
struct objc_ivar_list *ivars = class_->ivars;
|
|
if (ivars != NULL)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ivars->ivar_count; i++)
|
|
{
|
|
struct objc_ivar *ivar = &(ivars->ivar_list[i]);
|
|
|
|
if (!strcmp (ivar->ivar_name, name))
|
|
{
|
|
return ivar;
|
|
}
|
|
}
|
|
}
|
|
class_ = class_getSuperclass (class_);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct objc_ivar *
|
|
class_getClassVariable (Class class_, const char *name)
|
|
{
|
|
if (class_ == Nil)
|
|
return NULL;
|
|
|
|
/* Logically, since a class is an instance of its meta-class, and
|
|
since its class methods are the instance methods of the
|
|
meta-class, class variables should be instance variables of the
|
|
meta-class. That is different from the normal use of having
|
|
'static' variables in the class implementation file, because
|
|
every class would have its own variables.
|
|
|
|
Anyway, it is all speculative at this stage, but if we get class
|
|
variables in Objective-C, it is conceivable that this
|
|
implementation should work. */
|
|
return class_getInstanceVariable (class_->class_pointer, name);
|
|
}
|
|
|
|
void *
|
|
object_getIndexedIvars (id object)
|
|
{
|
|
if (object == nil)
|
|
return NULL;
|
|
else
|
|
{
|
|
return (void *)(((char *)object)
|
|
+ object->class_pointer->instance_size);
|
|
}
|
|
}
|
|
|
|
struct objc_ivar *
|
|
object_getInstanceVariable (id object, const char *name, void **returnValue)
|
|
{
|
|
if (object == nil || name == NULL)
|
|
return NULL;
|
|
else
|
|
{
|
|
struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name);
|
|
|
|
if (variable != NULL && returnValue != NULL)
|
|
{
|
|
char *location = (char *)object + variable->ivar_offset;
|
|
|
|
*returnValue = *((id *)location);
|
|
}
|
|
|
|
return variable;
|
|
}
|
|
}
|
|
|
|
struct objc_ivar *
|
|
object_setInstanceVariable (id object, const char *name, void *newValue)
|
|
{
|
|
if (object == nil || name == NULL)
|
|
return NULL;
|
|
else
|
|
{
|
|
struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name);
|
|
|
|
if (variable != NULL)
|
|
{
|
|
char *location = (char *)object + variable->ivar_offset;
|
|
|
|
*((id *)location) = (id)newValue;
|
|
}
|
|
|
|
return variable;
|
|
}
|
|
}
|
|
|
|
id object_getIvar (id object, struct objc_ivar * variable)
|
|
{
|
|
if (object == nil || variable == NULL)
|
|
return nil;
|
|
else
|
|
{
|
|
char *location = (char *)object + variable->ivar_offset;
|
|
|
|
return *((id *)location);
|
|
}
|
|
}
|
|
|
|
void object_setIvar (id object, struct objc_ivar * variable, id value)
|
|
{
|
|
if (object == nil || variable == NULL)
|
|
return;
|
|
else
|
|
{
|
|
char *location = (char *)object + variable->ivar_offset;
|
|
|
|
*((id *)location) = value;
|
|
}
|
|
}
|
|
|
|
const char * ivar_getName (struct objc_ivar * variable)
|
|
{
|
|
if (variable == NULL)
|
|
return NULL;
|
|
|
|
return variable->ivar_name;
|
|
}
|
|
|
|
ptrdiff_t ivar_getOffset (struct objc_ivar * variable)
|
|
{
|
|
if (variable == NULL)
|
|
return 0;
|
|
|
|
return (ptrdiff_t)(variable->ivar_offset);
|
|
}
|
|
|
|
const char * ivar_getTypeEncoding (struct objc_ivar * variable)
|
|
{
|
|
if (variable == NULL)
|
|
return NULL;
|
|
|
|
return variable->ivar_type;
|
|
}
|
|
|
|
struct objc_ivar ** class_copyIvarList (Class class_, unsigned int *numberOfReturnedIvars)
|
|
{
|
|
unsigned int count = 0;
|
|
struct objc_ivar **returnValue = NULL;
|
|
struct objc_ivar_list* ivar_list;
|
|
|
|
if (class_ == Nil || CLS_IS_IN_CONSTRUCTION (class_))
|
|
{
|
|
if (numberOfReturnedIvars)
|
|
*numberOfReturnedIvars = 0;
|
|
return NULL;
|
|
}
|
|
|
|
/* Count how many ivars we have. */
|
|
ivar_list = class_->ivars;
|
|
count = ivar_list->ivar_count;
|
|
|
|
if (count != 0)
|
|
{
|
|
unsigned int i = 0;
|
|
|
|
/* Allocate enough memory to hold them. */
|
|
returnValue = (struct objc_ivar **)(malloc (sizeof (struct objc_ivar *) * (count + 1)));
|
|
|
|
/* Copy the ivars. */
|
|
for (i = 0; i < count; i++)
|
|
{
|
|
returnValue[i] = &(ivar_list->ivar_list[i]);
|
|
}
|
|
|
|
returnValue[i] = NULL;
|
|
}
|
|
|
|
if (numberOfReturnedIvars)
|
|
*numberOfReturnedIvars = count;
|
|
|
|
return returnValue;
|
|
}
|
|
|
|
BOOL
|
|
class_addIvar (Class class_, const char * ivar_name, size_t size,
|
|
unsigned char alignment, const char *type)
|
|
{
|
|
struct objc_ivar_list *ivars;
|
|
|
|
if (class_ == Nil
|
|
|| (! CLS_IS_IN_CONSTRUCTION (class_))
|
|
|| ivar_name == NULL
|
|
|| (strcmp (ivar_name, "") == 0)
|
|
|| size == 0
|
|
|| type == NULL)
|
|
return NO;
|
|
|
|
/* Check if the class has an instance variable with that name
|
|
already. */
|
|
ivars = class_->ivars;
|
|
|
|
if (ivars != NULL)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ivars->ivar_count; i++)
|
|
{
|
|
struct objc_ivar *ivar = &(ivars->ivar_list[i]);
|
|
|
|
if (strcmp (ivar->ivar_name, ivar_name) == 0)
|
|
{
|
|
return NO;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Ok, no direct ivars. Check superclasses. */
|
|
if (class_getInstanceVariable (objc_getClass ((char *)(class_->super_class)),
|
|
ivar_name))
|
|
return NO;
|
|
|
|
/* Good. Create space for the new instance variable. */
|
|
if (ivars)
|
|
{
|
|
int ivar_count = ivars->ivar_count + 1;
|
|
int new_size = sizeof (struct objc_ivar_list)
|
|
+ (ivar_count - 1) * sizeof (struct objc_ivar);
|
|
|
|
ivars = (struct objc_ivar_list*) objc_realloc (ivars, new_size);
|
|
ivars->ivar_count = ivar_count;
|
|
class_->ivars = ivars;
|
|
}
|
|
else
|
|
{
|
|
int new_size = sizeof (struct objc_ivar_list);
|
|
|
|
ivars = (struct objc_ivar_list*) objc_malloc (new_size);
|
|
ivars->ivar_count = 1;
|
|
class_->ivars = ivars;
|
|
}
|
|
|
|
/* Now ivars is set to a list of instance variables of the right
|
|
size. */
|
|
{
|
|
struct objc_ivar *ivar = &(ivars->ivar_list[ivars->ivar_count - 1]);
|
|
int misalignment;
|
|
|
|
ivar->ivar_name = objc_malloc (strlen (ivar_name) + 1);
|
|
strcpy ((char *)ivar->ivar_name, ivar_name);
|
|
|
|
ivar->ivar_type = objc_malloc (strlen (type) + 1);
|
|
strcpy ((char *)ivar->ivar_type, type);
|
|
|
|
/* The new instance variable is placed at the end of the existing
|
|
instance_size, at the first byte that is aligned with
|
|
alignment. */
|
|
misalignment = class_->instance_size % alignment;
|
|
|
|
if (misalignment == 0)
|
|
ivar->ivar_offset = class_->instance_size;
|
|
else
|
|
ivar->ivar_offset = class_->instance_size - misalignment + alignment;
|
|
|
|
class_->instance_size = ivar->ivar_offset + objc_sizeof_type (ivar->ivar_type);
|
|
}
|
|
|
|
return YES;
|
|
}
|
|
|
|
|
|
const char *
|
|
property_getName (struct objc_property * property __attribute__ ((__unused__)))
|
|
{
|
|
if (property == NULL)
|
|
return NULL;
|
|
|
|
/* TODO: New ABI. */
|
|
/* The current ABI does not have any information on properties. */
|
|
return NULL;
|
|
}
|
|
|
|
const char *
|
|
property_getAttributes (struct objc_property * property __attribute__ ((__unused__)))
|
|
{
|
|
if (property == NULL)
|
|
return NULL;
|
|
|
|
/* TODO: New ABI. */
|
|
/* The current ABI does not have any information on properties. */
|
|
return NULL;
|
|
}
|
|
|
|
struct objc_property *
|
|
class_getProperty (Class class_ __attribute__ ((__unused__)),
|
|
const char *propertyName __attribute__ ((__unused__)))
|
|
{
|
|
if (class_ == NULL || propertyName == NULL)
|
|
return NULL;
|
|
|
|
/* TODO: New ABI. */
|
|
/* The current ABI does not have any information on class properties. */
|
|
return NULL;
|
|
}
|
|
|
|
struct objc_property **
|
|
class_copyPropertyList (Class class_ __attribute__ ((__unused__)),
|
|
unsigned int *numberOfReturnedProperties __attribute__ ((__unused__)))
|
|
{
|
|
if (class_ == Nil)
|
|
{
|
|
if (numberOfReturnedProperties)
|
|
*numberOfReturnedProperties = 0;
|
|
return NULL;
|
|
}
|
|
|
|
/* TODO: New ABI. */
|
|
/* The current ABI does not have any information on class properties. */
|
|
if (numberOfReturnedProperties)
|
|
*numberOfReturnedProperties = 0;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
const char *
|
|
class_getIvarLayout (Class class_ __attribute__ ((__unused__)))
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
const char *
|
|
class_getWeakIvarLayout (Class class_ __attribute__ ((__unused__)))
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
class_setIvarLayout (Class class_ __attribute__ ((__unused__)),
|
|
const char *layout __attribute__ ((__unused__)))
|
|
{
|
|
return;
|
|
}
|
|
|
|
void
|
|
class_setWeakIvarLayout (Class class_ __attribute__ ((__unused__)),
|
|
const char *layout __attribute__ ((__unused__)))
|
|
{
|
|
return;
|
|
}
|