2010-10-11 04:36:32 +02:00
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/* GNU Objective C Runtime ivar related functions.
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Copyright (C) 2010 Free Software Foundation, Inc.
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Contributed by Nicola Pero
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "objc-private/common.h"
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2010-10-12 18:17:18 +02:00
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#include "objc/runtime.h"
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#include "objc-private/module-abi-8.h" /* For runtime structures */
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#include "objc/thr.h"
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2010-10-13 00:00:01 +02:00
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#include "objc-private/runtime.h" /* the kitchen sink */
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#include <string.h> /* For strcmp */
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2010-10-11 04:36:32 +02:00
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struct objc_ivar *
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class_getInstanceVariable (Class class_, const char *name)
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{
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if (class_ != Nil && name != NULL)
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{
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objc_mutex_lock (__objc_runtime_mutex);
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while (class_ != Nil)
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{
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struct objc_ivar_list *ivars = class_->ivars;
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if (ivars != NULL)
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{
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int i;
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for (i = 0; i < ivars->ivar_count; i++)
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{
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struct objc_ivar *ivar = &(ivars->ivar_list[i]);
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if (!strcmp (ivar->ivar_name, name))
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{
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objc_mutex_unlock (__objc_runtime_mutex);
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return ivar;
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}
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}
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}
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class_ = class_->super_class;
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}
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objc_mutex_unlock (__objc_runtime_mutex);
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}
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return NULL;
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}
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2010-10-12 20:43:54 +02:00
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struct objc_ivar *
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class_getClassVariable (Class class_, const char *name)
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{
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if (class_ == Nil)
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return NULL;
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/* Logically, since a class is an instance of its meta-class, and
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since its class methods are the instance methods of the
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meta-class, class variables should be instance variables of the
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meta-class. That is different from the normal use of having
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'static' variables in the class implementation file, because
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every class would have its own variables.
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Anyway, it is all speculative at this stage, but if we get class
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variables in Objective-C, it is conceivable that this
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implementation should work. */
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return class_getInstanceVariable (class_->class_pointer, name);
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}
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2010-10-11 04:36:32 +02:00
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void *
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object_getIndexedIvars (id object)
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{
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if (object == nil)
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return NULL;
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else
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{
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return (void *)(((char *)object)
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+ object->class_pointer->instance_size);
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}
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}
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struct objc_ivar *
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object_getInstanceVariable (id object, const char *name, void **returnValue)
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{
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if (object == nil || name == NULL)
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return NULL;
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else
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{
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struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name);
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if (variable != NULL && returnValue != NULL)
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{
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char *location = (char *)object + variable->ivar_offset;
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*returnValue = *((id *)location);
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}
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return variable;
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}
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}
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struct objc_ivar *
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object_setInstanceVariable (id object, const char *name, void *newValue)
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{
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if (object == nil || name == NULL)
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return NULL;
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else
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{
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struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name);
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if (variable != NULL)
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{
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char *location = (char *)object + variable->ivar_offset;
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*((id *)location) = (id)newValue;
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}
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return variable;
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}
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}
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id object_getIvar (id object, struct objc_ivar * variable)
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{
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if (object == nil || variable == NULL)
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return nil;
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else
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{
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char *location = (char *)object + variable->ivar_offset;
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return *((id *)location);
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}
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}
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void object_setIvar (id object, struct objc_ivar * variable, id value)
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{
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if (object == nil || variable == NULL)
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return;
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else
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{
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char *location = (char *)object + variable->ivar_offset;
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*((id *)location) = value;
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}
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}
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const char * ivar_getName (struct objc_ivar * variable)
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{
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2010-10-13 00:00:01 +02:00
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if (variable == NULL)
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return NULL;
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2010-10-11 04:36:32 +02:00
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return variable->ivar_name;
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}
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ptrdiff_t ivar_getOffset (struct objc_ivar * variable)
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{
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2010-10-13 00:00:01 +02:00
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if (variable == NULL)
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return 0;
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2010-10-11 04:36:32 +02:00
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return (ptrdiff_t)(variable->ivar_offset);
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}
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const char * ivar_getTypeEncoding (struct objc_ivar * variable)
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{
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2010-10-13 00:00:01 +02:00
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if (variable == NULL)
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return NULL;
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2010-10-11 04:36:32 +02:00
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return variable->ivar_type;
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}
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2010-10-13 00:00:01 +02:00
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struct objc_ivar ** class_copyIvarList (Class class_, unsigned int *numberOfReturnedIvars)
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{
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unsigned int count = 0;
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struct objc_ivar **returnValue = NULL;
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struct objc_ivar_list* ivar_list;
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if (class_ == Nil)
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{
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if (numberOfReturnedIvars)
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*numberOfReturnedIvars = 0;
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return NULL;
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}
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/* TODO: We do not need to lock the runtime mutex if the class has
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been registered with the runtime, since the instance variable
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list can not change after the class is registered. The only case
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where the lock may be useful if the class is still being created
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using objc_allocateClassPair(), but has not been registered using
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objc_registerClassPair() yet. I'm not even sure that is
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allowed. */
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objc_mutex_lock (__objc_runtime_mutex);
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/* Count how many ivars we have. */
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ivar_list = class_->ivars;
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count = ivar_list->ivar_count;
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if (count != 0)
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{
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unsigned int i = 0;
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/* Allocate enough memory to hold them. */
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returnValue = (struct objc_ivar **)(malloc (sizeof (struct objc_ivar *) * (count + 1)));
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/* Copy the ivars. */
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for (i = 0; i < count; i++)
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{
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returnValue[i] = &(ivar_list->ivar_list[i]);
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}
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returnValue[i] = NULL;
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}
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objc_mutex_unlock (__objc_runtime_mutex);
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if (numberOfReturnedIvars)
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*numberOfReturnedIvars = count;
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return returnValue;
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}
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2010-10-16 01:42:02 +02:00
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const char *
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property_getName (struct objc_property * property __attribute__ ((__unused__)))
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{
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if (property == NULL)
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return NULL;
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/* TODO: New ABI. */
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/* The current ABI does not have any information on properties. */
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return NULL;
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}
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const char *
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property_getAttributes (struct objc_property * property __attribute__ ((__unused__)))
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{
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if (property == NULL)
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return NULL;
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/* TODO: New ABI. */
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/* The current ABI does not have any information on properties. */
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return NULL;
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}
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struct objc_property *
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class_getProperty (Class class_ __attribute__ ((__unused__)),
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const char *propertyName __attribute__ ((__unused__)))
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{
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if (class_ == NULL || propertyName == NULL)
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return NULL;
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/* TODO: New ABI. */
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/* The current ABI does not have any information on class properties. */
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return NULL;
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}
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struct objc_property **
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class_copyPropertyList (Class class_ __attribute__ ((__unused__)),
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unsigned int *numberOfReturnedProperties __attribute__ ((__unused__)))
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{
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if (class_ == Nil)
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{
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if (numberOfReturnedProperties)
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*numberOfReturnedProperties = 0;
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return NULL;
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}
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/* TODO: New ABI. */
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/* The current ABI does not have any information on class properties. */
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if (numberOfReturnedProperties)
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*numberOfReturnedProperties = 0;
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return NULL;
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}
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2010-10-16 02:04:37 +02:00
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const char *
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class_getIvarLayout (Class class_ __attribute__ ((__unused__)))
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{
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return NULL;
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}
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const char *
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class_getWeakIvarLayout (Class class_ __attribute__ ((__unused__)))
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{
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return NULL;
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}
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void
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class_setIvarLayout (Class class_ __attribute__ ((__unused__)),
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const char *layout __attribute__ ((__unused__)))
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{
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return;
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}
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void
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class_setWeakIvarLayout (Class class_ __attribute__ ((__unused__)),
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const char *layout __attribute__ ((__unused__)))
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{
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return;
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}
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