/* GNU Objective C Runtime method related functions.
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/* GNU Objective C Runtime method related functions.
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Copyright (C) 2010 Free Software Foundation, Inc.
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Copyright (C) 2010 Free Software Foundation, Inc.
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Contributed by Nicola Pero
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Contributed by Nicola Pero
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This file is part of GCC.
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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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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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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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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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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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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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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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details.
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Under Section 7 of GPL version 3, you are granted additional
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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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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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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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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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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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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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<http://www.gnu.org/licenses/>. */
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#include "objc-private/common.h"
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#include "objc-private/common.h"
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#include "objc/runtime.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-private/module-abi-8.h" /* For runtime structures. */
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#include "objc/thr.h"
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#include "objc/thr.h"
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#include "objc-private/runtime.h" /* For __objc_runtime_mutex. */
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#include "objc-private/runtime.h" /* For __objc_runtime_mutex. */
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#include <stdlib.h> /* For malloc. */
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#include <stdlib.h> /* For malloc. */
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SEL
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SEL
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method_getName (struct objc_method * method)
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method_getName (struct objc_method * method)
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{
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{
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if (method == NULL)
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if (method == NULL)
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return NULL;
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return NULL;
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return method->method_name;
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return method->method_name;
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}
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}
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const char *
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const char *
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method_getTypeEncoding (struct objc_method * method)
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method_getTypeEncoding (struct objc_method * method)
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{
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{
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if (method == NULL)
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if (method == NULL)
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return NULL;
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return NULL;
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return method->method_types;
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return method->method_types;
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}
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}
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IMP
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IMP
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method_getImplementation (struct objc_method * method)
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method_getImplementation (struct objc_method * method)
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{
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{
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if (method == NULL)
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if (method == NULL)
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return NULL;
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return NULL;
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return method->method_imp;
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return method->method_imp;
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}
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}
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struct objc_method_description *
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struct objc_method_description *
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method_getDescription (struct objc_method * method)
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method_getDescription (struct objc_method * method)
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{
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{
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/* Note that the following returns NULL if method is NULL, which is
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/* Note that the following returns NULL if method is NULL, which is
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fine. */
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fine. */
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return (struct objc_method_description *)method;
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return (struct objc_method_description *)method;
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}
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}
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struct objc_method **
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struct objc_method **
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class_copyMethodList (Class class_, unsigned int *numberOfReturnedMethods)
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class_copyMethodList (Class class_, unsigned int *numberOfReturnedMethods)
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{
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{
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unsigned int count = 0;
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unsigned int count = 0;
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struct objc_method **returnValue = NULL;
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struct objc_method **returnValue = NULL;
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struct objc_method_list* method_list;
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struct objc_method_list* method_list;
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if (class_ == Nil)
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if (class_ == Nil)
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{
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{
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if (numberOfReturnedMethods)
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if (numberOfReturnedMethods)
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*numberOfReturnedMethods = 0;
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*numberOfReturnedMethods = 0;
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return NULL;
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return NULL;
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}
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}
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/* Lock the runtime mutex because the class methods may be
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/* Lock the runtime mutex because the class methods may be
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concurrently modified. */
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concurrently modified. */
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objc_mutex_lock (__objc_runtime_mutex);
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objc_mutex_lock (__objc_runtime_mutex);
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/* Count how many methods we have. */
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/* Count how many methods we have. */
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method_list = class_->methods;
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method_list = class_->methods;
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while (method_list)
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while (method_list)
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{
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{
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count = count + method_list->method_count;
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count = count + method_list->method_count;
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method_list = method_list->method_next;
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method_list = method_list->method_next;
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}
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}
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if (count != 0)
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if (count != 0)
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{
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{
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unsigned int i = 0;
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unsigned int i = 0;
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/* Allocate enough memory to hold them. */
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/* Allocate enough memory to hold them. */
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returnValue
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returnValue
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= (struct objc_method **)(malloc (sizeof (struct objc_method *)
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= (struct objc_method **)(malloc (sizeof (struct objc_method *)
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* (count + 1)));
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* (count + 1)));
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/* Copy the methods. */
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/* Copy the methods. */
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method_list = class_->methods;
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method_list = class_->methods;
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while (method_list)
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while (method_list)
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{
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{
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int j;
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int j;
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for (j = 0; j < method_list->method_count; j++)
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for (j = 0; j < method_list->method_count; j++)
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{
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{
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returnValue[i] = &(method_list->method_list[j]);
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returnValue[i] = &(method_list->method_list[j]);
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i++;
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i++;
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}
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}
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method_list = method_list->method_next;
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method_list = method_list->method_next;
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}
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}
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returnValue[i] = NULL;
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returnValue[i] = NULL;
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}
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}
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objc_mutex_unlock (__objc_runtime_mutex);
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objc_mutex_unlock (__objc_runtime_mutex);
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if (numberOfReturnedMethods)
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if (numberOfReturnedMethods)
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*numberOfReturnedMethods = count;
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*numberOfReturnedMethods = count;
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return returnValue;
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return returnValue;
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}
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}
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IMP
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IMP
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method_setImplementation (struct objc_method * method, IMP implementation)
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method_setImplementation (struct objc_method * method, IMP implementation)
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{
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{
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IMP old_implementation;
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IMP old_implementation;
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if (method == NULL || implementation == NULL)
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if (method == NULL || implementation == NULL)
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return NULL;
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return NULL;
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/* We lock the runtime mutex so that concurrent calls to change the
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/* We lock the runtime mutex so that concurrent calls to change the
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same method won't conflict with each other. */
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same method won't conflict with each other. */
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objc_mutex_lock (__objc_runtime_mutex);
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objc_mutex_lock (__objc_runtime_mutex);
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old_implementation = method->method_imp;
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old_implementation = method->method_imp;
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method->method_imp = implementation;
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method->method_imp = implementation;
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/* That was easy :-). But now we need to find all classes that use
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/* That was easy :-). But now we need to find all classes that use
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this method, and update the IMP in the dispatch tables. */
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this method, and update the IMP in the dispatch tables. */
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__objc_update_classes_with_methods (method, NULL);
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__objc_update_classes_with_methods (method, NULL);
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objc_mutex_unlock (__objc_runtime_mutex);
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objc_mutex_unlock (__objc_runtime_mutex);
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return old_implementation;
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return old_implementation;
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}
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}
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void
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void
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method_exchangeImplementations (struct objc_method * method_a, struct objc_method * method_b)
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method_exchangeImplementations (struct objc_method * method_a, struct objc_method * method_b)
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{
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{
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IMP old_implementation_a;
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IMP old_implementation_a;
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IMP old_implementation_b;
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IMP old_implementation_b;
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if (method_a == NULL || method_b == NULL)
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if (method_a == NULL || method_b == NULL)
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return;
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return;
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/* We lock the runtime mutex so that concurrent calls to exchange
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/* We lock the runtime mutex so that concurrent calls to exchange
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similar methods won't conflict with each other. Each of them
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similar methods won't conflict with each other. Each of them
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should be atomic. */
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should be atomic. */
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objc_mutex_lock (__objc_runtime_mutex);
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objc_mutex_lock (__objc_runtime_mutex);
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old_implementation_a = method_a->method_imp;
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old_implementation_a = method_a->method_imp;
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old_implementation_b = method_b->method_imp;
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old_implementation_b = method_b->method_imp;
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method_a->method_imp = old_implementation_b;
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method_a->method_imp = old_implementation_b;
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method_b->method_imp = old_implementation_a;
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method_b->method_imp = old_implementation_a;
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/* That was easy :-). But now we need to find all classes that use
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/* That was easy :-). But now we need to find all classes that use
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these methods, and update the IMP in the dispatch tables. */
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these methods, and update the IMP in the dispatch tables. */
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__objc_update_classes_with_methods (method_a, method_b);
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__objc_update_classes_with_methods (method_a, method_b);
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objc_mutex_unlock (__objc_runtime_mutex);
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objc_mutex_unlock (__objc_runtime_mutex);
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}
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}
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