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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libobjc/] [methods.c] - Blame information for rev 739

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1 739 jeremybenn
/* GNU Objective C Runtime method 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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#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"      /* For __objc_runtime_mutex.  */
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#include <stdlib.h>                    /* For malloc.  */
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SEL
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method_getName (struct objc_method * method)
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{
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  if (method == NULL)
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    return NULL;
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  return method->method_name;
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}
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const char *
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method_getTypeEncoding (struct objc_method * method)
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{
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  if (method == NULL)
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    return NULL;
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  return method->method_types;
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}
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IMP
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method_getImplementation (struct objc_method * method)
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{
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  if (method == NULL)
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    return NULL;
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  return method->method_imp;
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}
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struct objc_method_description *
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method_getDescription (struct objc_method * method)
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{
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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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  return (struct objc_method_description *)method;
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}
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struct objc_method **
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class_copyMethodList (Class class_, unsigned int *numberOfReturnedMethods)
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{
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  unsigned int count = 0;
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  struct objc_method **returnValue = NULL;
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  struct objc_method_list* method_list;
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  if (class_ == Nil)
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    {
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      if (numberOfReturnedMethods)
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        *numberOfReturnedMethods = 0;
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      return NULL;
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    }
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  /* Lock the runtime mutex because the class methods may be
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     concurrently modified.  */
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  objc_mutex_lock (__objc_runtime_mutex);
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  /* Count how many methods we have.  */
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  method_list = class_->methods;
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  while (method_list)
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    {
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      count = count + method_list->method_count;
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      method_list = method_list->method_next;
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    }
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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
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        = (struct objc_method **)(malloc (sizeof (struct objc_method *)
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                                          * (count + 1)));
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      /* Copy the methods.  */
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      method_list = class_->methods;
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      while (method_list)
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        {
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          int j;
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          for (j = 0; j < method_list->method_count; j++)
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            {
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              returnValue[i] = &(method_list->method_list[j]);
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              i++;
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            }
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          method_list = method_list->method_next;
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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 (numberOfReturnedMethods)
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    *numberOfReturnedMethods = count;
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  return returnValue;
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}
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IMP
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method_setImplementation (struct objc_method * method, IMP implementation)
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{
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  IMP old_implementation;
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  if (method == NULL  ||  implementation == 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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     same method won't conflict with each other.  */
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  objc_mutex_lock (__objc_runtime_mutex);
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  old_implementation = method->method_imp;
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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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     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_mutex_unlock (__objc_runtime_mutex);
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  return old_implementation;
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}
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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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{
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  IMP old_implementation_a;
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  IMP old_implementation_b;
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  if (method_a == NULL  ||  method_b == NULL)
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    return;
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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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     should be atomic.  */
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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_b = method_b->method_imp;
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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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  /* 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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  __objc_update_classes_with_methods (method_a, method_b);
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  objc_mutex_unlock (__objc_runtime_mutex);
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}

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