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       1                 :             : /* Interprocedural reference lists.
       2                 :             :    Copyright (C) 2010-2024 Free Software Foundation, Inc.
       3                 :             :    Contributed by Jan Hubicka
       4                 :             : 
       5                 :             : This file is part of GCC.
       6                 :             : 
       7                 :             : GCC is free software; you can redistribute it and/or modify it under
       8                 :             : the terms of the GNU General Public License as published by the Free
       9                 :             : Software Foundation; either version 3, or (at your option) any later
      10                 :             : version.
      11                 :             : 
      12                 :             : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      13                 :             : WARRANTY; without even the implied warranty of MERCHANTABILITY or
      14                 :             : FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      15                 :             : for more details.
      16                 :             : 
      17                 :             : You should have received a copy of the GNU General Public License
      18                 :             : along with GCC; see the file COPYING3.  If not see
      19                 :             : <http://www.gnu.org/licenses/>.  */
      20                 :             : 
      21                 :             : #include "config.h"
      22                 :             : #include "system.h"
      23                 :             : #include "coretypes.h"
      24                 :             : #include "target.h"
      25                 :             : #include "tree.h"
      26                 :             : #include "cgraph.h"
      27                 :             : 
      28                 :             : /* Remove reference.  */
      29                 :             : 
      30                 :             : void
      31                 :    34836408 : ipa_ref::remove_reference ()
      32                 :             : {
      33                 :    34836408 :   struct ipa_ref_list *list = referred_ref_list ();
      34                 :    34836408 :   struct ipa_ref_list *list2 = referring_ref_list ();
      35                 :    34836408 :   struct ipa_ref *last;
      36                 :             : 
      37                 :    34836408 :   gcc_assert (list->referring[referred_index] == this);
      38                 :             : 
      39                 :    34836408 :   last = list->referring.last ();
      40                 :    34836408 :   if (this != last)
      41                 :             :     {
      42                 :    13439296 :       if (use == IPA_REF_ALIAS)
      43                 :             :         {
      44                 :             :           /* If deleted item is IPA_REF_ALIAS, we have to move last
      45                 :             :           item of IPA_REF_LIST type to the deleted position. After that
      46                 :             :           we replace last node with deletion slot.  */
      47                 :       45166 :           struct ipa_ref *last_alias = list->last_alias ();
      48                 :             : 
      49                 :       45166 :           if (last_alias && referred_index < last_alias->referred_index
      50                 :       43626 :               && last_alias != last)
      51                 :             :           {
      52                 :         114 :             unsigned last_alias_index = last_alias->referred_index;
      53                 :             : 
      54                 :         114 :             list->referring[referred_index] = last_alias;
      55                 :         114 :             list->referring[referred_index]->referred_index = referred_index;
      56                 :             : 
      57                 :             :             /* New position for replacement is previous index
      58                 :             :                of the last_alias.  */
      59                 :         114 :             referred_index = last_alias_index;
      60                 :             :           }
      61                 :             :         }
      62                 :             : 
      63                 :    13439296 :       list->referring[referred_index] = list->referring.last ();
      64                 :    13439296 :       list->referring[referred_index]->referred_index= referred_index;
      65                 :             :     }
      66                 :    34836408 :   list->referring.pop ();
      67                 :             : 
      68                 :    34836408 :   last = &list2->references.last ();
      69                 :             : 
      70                 :    34836408 :   struct ipa_ref *ref = this;
      71                 :             : 
      72                 :    34836408 :   if (ref != last)
      73                 :             :     {
      74                 :      142767 :       *ref = *last;
      75                 :      142767 :       ref->referred_ref_list ()->referring[referred_index] = ref;
      76                 :             :     }
      77                 :    34836408 :   list2->references.pop ();
      78                 :    34836408 : }
      79                 :             : 
      80                 :             : /* Return true when execution of reference can lead to return from
      81                 :             :    function.  */
      82                 :             : 
      83                 :             : bool
      84                 :      175431 : ipa_ref::cannot_lead_to_return ()
      85                 :             : {
      86                 :      350862 :   return dyn_cast <cgraph_node *> (referring)->cannot_return_p ();
      87                 :             : }
      88                 :             : 
      89                 :             : /* Return reference list this reference is in.  */
      90                 :             : 
      91                 :             : struct ipa_ref_list *
      92                 :    34836408 : ipa_ref::referring_ref_list (void)
      93                 :             : {
      94                 :    34836408 :   return &referring->ref_list;
      95                 :             : }
      96                 :             : 
      97                 :             : /* Return reference list this reference is in.  */
      98                 :             : 
      99                 :             : struct ipa_ref_list *
     100                 :    69909409 : ipa_ref::referred_ref_list (void)
     101                 :             : {
     102                 :    69909409 :   return &referred->ref_list;
     103                 :             : }