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/* IPA reference lists.

   Copyright (C) 2010

   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/>.  */

struct cgraph_node;

struct varpool_node;

union symtab_node_def;

typedef union symtab_node_def *symtab_node;

typedef const union symtab_node_def *const_symtab_node;

/* How the reference is done.  */

enum GTY(()) ipa_ref_use

{

  IPA_REF_LOAD,

  IPA_REF_STORE,

  IPA_REF_ADDR,

  IPA_REF_ALIAS

};

/* Record of reference in callgraph or varpool.  */

struct GTY(()) ipa_ref

{

  symtab_node referring;

  symtab_node referred;

  gimple stmt;

  unsigned int referred_index;

  ENUM_BITFIELD (ipa_ref_use) use:2;

};

typedef struct ipa_ref ipa_ref_t;

typedef struct ipa_ref *ipa_ref_ptr;

/* List of references.  This is stored in both callgraph and varpool nodes.  */

struct GTY(()) ipa_ref_list

{

  /* Store actual references in references vector.  */

  vec<ipa_ref_t, va_gc> *references;

  /* Referring is vector of pointers to references.  It must not live in GGC space

     or GGC will try to mark middle of references vectors.  */

  vec<ipa_ref_ptr>  GTY((skip)) referring;

};

struct ipa_ref * ipa_record_reference (symtab_node,

                                       symtab_node,

                                       enum ipa_ref_use, gimple);

void ipa_remove_reference (struct ipa_ref *);

void ipa_remove_all_references (struct ipa_ref_list *);

void ipa_remove_all_referring (struct ipa_ref_list *);

void ipa_dump_references (FILE *, struct ipa_ref_list *);

void ipa_dump_referring (FILE *, struct ipa_ref_list *);

void ipa_clone_references (symtab_node, struct ipa_ref_list *);

void ipa_clone_referring (symtab_node, struct ipa_ref_list *);

bool ipa_ref_cannot_lead_to_return (struct ipa_ref *);

bool ipa_ref_has_aliases_p (struct ipa_ref_list *);