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377 lines
9.4 KiB
C
377 lines
9.4 KiB
C
/* GNU Objective C Runtime ivar related functions.
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Copyright (C) 2010-2022 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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#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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#include "objc-private/runtime.h" /* the kitchen sink */
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#include <string.h> /* For strcmp. */
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#include <stdlib.h> /* For malloc. */
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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 && ! CLS_IS_IN_CONSTRUCTION (class_))
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{
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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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return ivar;
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}
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}
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class_ = class_getSuperclass (class_);
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}
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}
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return NULL;
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}
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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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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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return (void *)(((char *)object)
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+ object->class_pointer->instance_size);
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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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if (variable == NULL)
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return NULL;
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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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if (variable == NULL)
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return 0;
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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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if (variable == NULL)
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return NULL;
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return variable->ivar_type;
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}
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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 || CLS_IS_IN_CONSTRUCTION (class_) || !class_->ivars)
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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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/* 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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returnValue[i] = &(ivar_list->ivar_list[i]);
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returnValue[i] = NULL;
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}
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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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BOOL
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class_addIvar (Class class_, const char * ivar_name, size_t size,
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unsigned char log_2_of_alignment, const char *type)
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{
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struct objc_ivar_list *ivars;
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if (class_ == Nil
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|| (! CLS_IS_IN_CONSTRUCTION (class_))
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|| ivar_name == NULL
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|| (strcmp (ivar_name, "") == 0)
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|| size == 0
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|| type == NULL)
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return NO;
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/* Check if the class has an instance variable with that name
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already. */
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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, ivar_name) == 0)
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return NO;
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}
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}
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/* Ok, no direct ivars. Check superclasses. */
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if (class_getInstanceVariable (objc_getClass ((char *)(class_->super_class)),
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ivar_name))
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return NO;
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/* Good. Create space for the new instance variable. */
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if (ivars)
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{
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int ivar_count = ivars->ivar_count + 1;
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int new_size = sizeof (struct objc_ivar_list)
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+ (ivar_count - 1) * sizeof (struct objc_ivar);
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ivars = (struct objc_ivar_list*) objc_realloc (ivars, new_size);
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ivars->ivar_count = ivar_count;
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class_->ivars = ivars;
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}
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else
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{
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int new_size = sizeof (struct objc_ivar_list);
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ivars = (struct objc_ivar_list*) objc_malloc (new_size);
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ivars->ivar_count = 1;
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class_->ivars = ivars;
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}
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/* Now ivars is set to a list of instance variables of the right
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size. */
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{
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struct objc_ivar *ivar = &(ivars->ivar_list[ivars->ivar_count - 1]);
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unsigned int alignment = 1 << log_2_of_alignment;
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int misalignment;
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ivar->ivar_name = objc_malloc (strlen (ivar_name) + 1);
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strcpy ((char *)ivar->ivar_name, ivar_name);
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ivar->ivar_type = objc_malloc (strlen (type) + 1);
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strcpy ((char *)ivar->ivar_type, type);
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/* The new instance variable is placed at the end of the existing
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instance_size, at the first byte that is aligned with
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alignment. */
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misalignment = class_->instance_size % alignment;
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if (misalignment == 0)
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ivar->ivar_offset = class_->instance_size;
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else
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ivar->ivar_offset = class_->instance_size - misalignment + alignment;
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class_->instance_size = ivar->ivar_offset + size;
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}
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return YES;
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}
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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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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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