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106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/* Interprocedural reference lists.
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Copyright (C) 2010-2019 Free Software Foundation, Inc.
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Contributed by Jan Hubicka
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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
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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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
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "target.h"
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#include "tree.h"
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#include "cgraph.h"
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/* Remove reference. */
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void
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ipa_ref::remove_reference ()
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{
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struct ipa_ref_list *list = referred_ref_list ();
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struct ipa_ref_list *list2 = referring_ref_list ();
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vec<ipa_ref_t, va_gc> *old_references = list2->references;
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struct ipa_ref *last;
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gcc_assert (list->referring[referred_index] == this);
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last = list->referring.last ();
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if (this != last)
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{
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if (use == IPA_REF_ALIAS)
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{
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/* If deleted item is IPA_REF_ALIAS, we have to move last
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item of IPA_REF_LIST type to the deleted position. After that
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we replace last node with deletion slot. */
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struct ipa_ref *last_alias = list->last_alias ();
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if (last_alias && referred_index < last_alias->referred_index
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&& last_alias != last)
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{
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unsigned last_alias_index = last_alias->referred_index;
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list->referring[referred_index] = last_alias;
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list->referring[referred_index]->referred_index = referred_index;
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/* New position for replacement is previous index
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of the last_alias. */
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referred_index = last_alias_index;
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}
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}
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list->referring[referred_index] = list->referring.last ();
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list->referring[referred_index]->referred_index= referred_index;
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}
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list->referring.pop ();
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last = &list2->references->last ();
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struct ipa_ref *ref = this;
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if (ref != last)
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{
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*ref = *last;
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ref->referred_ref_list ()->referring[referred_index] = ref;
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}
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list2->references->pop ();
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gcc_assert (list2->references == old_references);
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}
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/* Return true when execution of reference can lead to return from
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function. */
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bool
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ipa_ref::cannot_lead_to_return ()
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{
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return dyn_cast <cgraph_node *> (referring)->cannot_return_p ();
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}
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/* Return reference list this reference is in. */
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struct ipa_ref_list *
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ipa_ref::referring_ref_list (void)
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{
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return &referring->ref_list;
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}
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/* Return reference list this reference is in. */
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struct ipa_ref_list *
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ipa_ref::referred_ref_list (void)
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{
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return &referred->ref_list;
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}
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