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/* Interprocedural reference lists.
Copyright (C) 2010-2013 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 "tree.h"
#include "ggc.h"
#include "target.h"
#include "cgraph.h"
static const char *ipa_ref_use_name[] = {"read","write","addr","alias"};
/* Return ipa reference from REFERING_NODE or REFERING_VARPOOL_NODE
to REFERED_NODE or REFERED_VARPOOL_NODE. USE_TYPE specify type
of the use and STMT the statement (if it exists). */
struct ipa_ref *
ipa_record_reference (symtab_node referring_node,
symtab_node referred_node,
enum ipa_ref_use use_type, gimple stmt)
{
struct ipa_ref *ref;
struct ipa_ref_list *list, *list2;
ipa_ref_t *old_references;
gcc_checking_assert (!stmt || is_a <cgraph_node> (referring_node));
gcc_checking_assert (use_type != IPA_REF_ALIAS || !stmt);
list = &referring_node->symbol.ref_list;
old_references = vec_safe_address (list->references);
vec_safe_grow (list->references, vec_safe_length (list->references) + 1);
ref = &list->references->last ();
list2 = &referred_node->symbol.ref_list;
list2->referring.safe_push (ref);
ref->referred_index = list2->referring.length () - 1;
ref->referring = referring_node;
ref->referred = referred_node;
ref->stmt = stmt;
ref->use = use_type;
/* If vector was moved in memory, update pointers. */
if (old_references != list->references->address ())
{
int i;
for (i = 0; ipa_ref_list_reference_iterate (list, i, ref); i++)
ipa_ref_referred_ref_list (ref)->referring[ref->referred_index] = ref;
}
return ref;
}
/* Remove reference REF. */
void
ipa_remove_reference (struct ipa_ref *ref)
{
struct ipa_ref_list *list = ipa_ref_referred_ref_list (ref);
struct ipa_ref_list *list2 = ipa_ref_referring_ref_list (ref);
vec<ipa_ref_t, va_gc> *old_references = list2->references;
struct ipa_ref *last;
gcc_assert (list->referring[ref->referred_index] == ref);
last = list->referring.last ();
if (ref != last)
{
list->referring[ref->referred_index] = list->referring.last ();
list->referring[ref->referred_index]->referred_index
= ref->referred_index;
}
list->referring.pop ();
last = &list2->references->last ();
if (ref != last)
{
*ref = *last;
ipa_ref_referred_ref_list (ref)->referring[ref->referred_index] = ref;
}
list2->references->pop ();
gcc_assert (list2->references == old_references);
}
/* Remove all references in ref list LIST. */
void
ipa_remove_all_references (struct ipa_ref_list *list)
{
while (vec_safe_length (list->references))
ipa_remove_reference (&list->references->last ());
vec_free (list->references);
}
/* Remove all references in ref list LIST. */
void
ipa_remove_all_referring (struct ipa_ref_list *list)
{
while (list->referring.length ())
ipa_remove_reference (list->referring.last ());
list->referring.release ();
}
/* Dump references in LIST to FILE. */
void
ipa_dump_references (FILE * file, struct ipa_ref_list *list)
{
struct ipa_ref *ref;
int i;
for (i = 0; ipa_ref_list_reference_iterate (list, i, ref); i++)
{
fprintf (file, "%s/%i (%s)",
symtab_node_asm_name (ref->referred),
ref->referred->symbol.order,
ipa_ref_use_name [ref->use]);
}
fprintf (file, "\n");
}
/* Dump referring in LIST to FILE. */
void
ipa_dump_referring (FILE * file, struct ipa_ref_list *list)
{
struct ipa_ref *ref;
int i;
for (i = 0; ipa_ref_list_referring_iterate (list, i, ref); i++)
{
fprintf (file, "%s/%i (%s)",
symtab_node_asm_name (ref->referring),
ref->referring->symbol.order,
ipa_ref_use_name [ref->use]);
}
fprintf (file, "\n");
}
/* Clone all references from SRC to DEST_NODE or DEST_VARPOOL_NODE. */
void
ipa_clone_references (symtab_node dest_node,
struct ipa_ref_list *src)
{
struct ipa_ref *ref;
int i;
for (i = 0; ipa_ref_list_reference_iterate (src, i, ref); i++)
ipa_record_reference (dest_node,
ref->referred,
ref->use, ref->stmt);
}
/* Clone all referring from SRC to DEST_NODE or DEST_VARPOOL_NODE. */
void
ipa_clone_referring (symtab_node dest_node,
struct ipa_ref_list *src)
{
struct ipa_ref *ref;
int i;
for (i = 0; ipa_ref_list_referring_iterate (src, i, ref); i++)
ipa_record_reference (ref->referring,
dest_node,
ref->use, ref->stmt);
}
/* Return true when execution of REF can lead to return from
function. */
bool
ipa_ref_cannot_lead_to_return (struct ipa_ref *ref)
{
return cgraph_node_cannot_return (ipa_ref_referring_node (ref));
}
/* Return true if list contains an alias. */
bool
ipa_ref_has_aliases_p (struct ipa_ref_list *ref_list)
{
struct ipa_ref *ref;
int i;
for (i = 0; ipa_ref_list_referring_iterate (ref_list, i, ref); i++)
if (ref->use == IPA_REF_ALIAS)
return true;
return false;
}
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