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/* Interprocedural reference lists.
Copyright (C) 2010-2020 Free Software Foundation, Inc.
Contributed by Jan Hubicka
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "target.h"
#include "tree.h"
#include "cgraph.h"
/* Remove reference. */
void
ipa_ref::remove_reference ()
{
struct ipa_ref_list *list = referred_ref_list ();
struct ipa_ref_list *list2 = referring_ref_list ();
vec<ipa_ref_t, va_gc> *old_references = list2->references;
struct ipa_ref *last;
gcc_assert (list->referring[referred_index] == this);
last = list->referring.last ();
if (this != last)
{
if (use == IPA_REF_ALIAS)
{
/* If deleted item is IPA_REF_ALIAS, we have to move last
item of IPA_REF_LIST type to the deleted position. After that
we replace last node with deletion slot. */
struct ipa_ref *last_alias = list->last_alias ();
if (last_alias && referred_index < last_alias->referred_index
&& last_alias != last)
{
unsigned last_alias_index = last_alias->referred_index;
list->referring[referred_index] = last_alias;
list->referring[referred_index]->referred_index = referred_index;
/* New position for replacement is previous index
of the last_alias. */
referred_index = last_alias_index;
}
}
list->referring[referred_index] = list->referring.last ();
list->referring[referred_index]->referred_index= referred_index;
}
list->referring.pop ();
last = &list2->references->last ();
struct ipa_ref *ref = this;
if (ref != last)
{
*ref = *last;
ref->referred_ref_list ()->referring[referred_index] = ref;
}
list2->references->pop ();
gcc_assert (list2->references == old_references);
}
/* Return true when execution of reference can lead to return from
function. */
bool
ipa_ref::cannot_lead_to_return ()
{
return dyn_cast <cgraph_node *> (referring)->cannot_return_p ();
}
/* Return reference list this reference is in. */
struct ipa_ref_list *
ipa_ref::referring_ref_list (void)
{
return &referring->ref_list;
}
/* Return reference list this reference is in. */
struct ipa_ref_list *
ipa_ref::referred_ref_list (void)
{
return &referred->ref_list;
}
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