gcc/ipa-ref.c

   1 /* Interprocedural reference lists.
   2    Copyright (C) 2010-2014 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 "tree.h"
  25 #include "ggc.h"
  26 #include "target.h"
  27 #include "cgraph.h"
  28 #include "ipa-utils.h"
  29
  30 /* Remove reference.  */
  31
  32 void
  33 ipa_ref::remove_reference ()
  34 {
  35   struct ipa_ref_list *list = referred_ref_list ();
  36   struct ipa_ref_list *list2 = referring_ref_list ();
  37   vec<ipa_ref_t, va_gc> *old_references = list2->references;
  38   struct ipa_ref *last;
  39
  40   gcc_assert (list->referring[referred_index] == this);
  41   last = list->referring.last ();
  42   if (this != last)
  43     {
  44       list->referring[referred_index] = list->referring.last ();
  45       list->referring[referred_index]->referred_index
  46           = referred_index;
  47     }
  48   list->referring.pop ();
  49
  50   last = &list2->references->last ();
  51
  52   struct ipa_ref *ref = this;
  53
  54   if (ref != last)
  55     {
  56       *ref = *last;
  57       referred_ref_list ()->referring[referred_index] = ref;
  58     }
  59   list2->references->pop ();
  60   gcc_assert (list2->references == old_references);
  61 }
  62
  63 /* Return true when execution of reference can lead to return from
  64    function.  */
  65
  66 bool
  67 ipa_ref::cannot_lead_to_return ()
  68 {
  69   return cgraph_node_cannot_return (dyn_cast <cgraph_node *> (referring));
  70 }
  71
  72 /* Return reference list this reference is in.  */
  73
  74 struct ipa_ref_list *
  75 ipa_ref::referring_ref_list (void)
  76 {
  77   return &referring->ref_list;
  78 }
  79
  80 /* Return reference list this reference is in.  */
  81
  82 struct ipa_ref_list *
  83 ipa_ref::referred_ref_list (void)
  84 {
  85   return &referred->ref_list;
  86 }