/* Callgraph handling code.
   Copyright (C) 2003, 2004, 2005 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 2, 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 COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#ifndef GCC_CGRAPH_H
#define GCC_CGRAPH_H
#include "tree.h"
#include "basic-block.h"

/* Information about the function collected locally.
   Available after function is analyzed.  */

struct cgraph_local_info GTY(())
{
  /* Size of the function before inlining.  */
  int self_insns;

  /* Set when function function is visible in current compilation unit only
     and its address is never taken.  */
  bool local;

  /* Set once it has been finalized so we consider it to be output.  */
  bool finalized;

  /* False when there something makes inlining impossible (such as va_arg).  */
  bool inlinable;

  /* True when function should be inlined independently on its size.  */
  bool disregard_inline_limits;

  /* True when the function has been originally extern inline, but it is
     redefined now.  */
  bool redefined_extern_inline;

  /* True if statics_read_for_function and
     statics_written_for_function contain valid data.  */
  bool for_functions_valid;

  /* True if the function is going to be emitted in some other translation
     unit, referenced from vtable.  */
  bool vtable_method;
};

/* Information about the function that needs to be computed globally
   once compilation is finished.  Available only with -funit-at-time.  */

struct cgraph_global_info GTY(())
{
  /* For inline clones this points to the function they will be inlined into.  */
  struct cgraph_node *inlined_to;

  /* Estimated size of the function after inlining.  */
  int insns;

  /* Estimated growth after inlining.  INT_MIN if not computed.  */
  int estimated_growth;

  /* Set iff the function has been inlined at least once.  */
  bool inlined;
};

/* Information about the function that is propagated by the RTL backend.
   Available only for functions that has been already assembled.  */

struct cgraph_rtl_info GTY(())
{
   int preferred_incoming_stack_boundary;
   bool const_function;
   bool pure_function;
};

/* The cgraph data structure.
   Each function decl has assigned cgraph_node listing callees and callers.  */

struct cgraph_node GTY((chain_next ("%h.next"), chain_prev ("%h.previous")))
{
  tree decl;
  struct cgraph_edge *callees;
  struct cgraph_edge *callers;
  struct cgraph_node *next;
  struct cgraph_node *previous;
  /* For nested functions points to function the node is nested in.  */
  struct cgraph_node *origin;
  /* Points to first nested function, if any.  */
  struct cgraph_node *nested;
  /* Pointer to the next function with same origin, if any.  */
  struct cgraph_node *next_nested;
  /* Pointer to the next function in cgraph_nodes_queue.  */
  struct cgraph_node *next_needed;
  /* Pointer to the next clone.  */
  struct cgraph_node *next_clone;
  struct cgraph_node *prev_clone;
  PTR GTY ((skip)) aux;

  struct cgraph_local_info local;
  struct cgraph_global_info global;
  struct cgraph_rtl_info rtl;
  
  /* Expected number of executions: calculated in profile.c.  */
  gcov_type count;
  /* Unique id of the node.  */
  int uid;
  /* Set when function must be output - it is externally visible
     or its address is taken.  */
  bool needed;
  /* Set when function is reachable by call from other function
     that is either reachable or needed.  */
  bool reachable;
  /* Set once the function is lowered (ie it's CFG is built).  */
  bool lowered;
  /* Set once the function has been instantiated and its callee
     lists created.  */
  bool analyzed;
  /* Set when function is scheduled to be assembled.  */
  bool output;
  /* Set for aliases once they got through assemble_alias.  */
  bool alias;
};

struct cgraph_edge GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller")))
{
  struct cgraph_node *caller;
  struct cgraph_node *callee;
  struct cgraph_edge *prev_caller;
  struct cgraph_edge *next_caller;
  struct cgraph_edge *prev_callee;
  struct cgraph_edge *next_callee;
  tree call_stmt;
  PTR GTY ((skip (""))) aux;
  /* When NULL, inline this call.  When non-NULL, points to the explanation
     why function was not inlined.  */
  const char *inline_failed;
  /* Expected number of executions: calculated in profile.c.  */
  gcov_type count;
  /* Depth of loop nest, 1 means no loop nest.  */
  int loop_nest;
};

/* The cgraph_varpool data structure.
   Each static variable decl has assigned cgraph_varpool_node.  */

struct cgraph_varpool_node GTY(())
{
  tree decl;
  /* Pointer to the next function in cgraph_varpool_nodes.  */
  struct cgraph_varpool_node *next;
  /* Pointer to the next function in cgraph_varpool_nodes_queue.  */
  struct cgraph_varpool_node *next_needed;

  /* Set when function must be output - it is externally visible
     or its address is taken.  */
  bool needed;
  /* Needed variables might become dead by optimization.  This flag
     forces the variable to be output even if it appears dead otherwise.  */
  bool force_output;
  /* Set once the variable has been instantiated and its callee
     lists created.  */
  bool analyzed;
  /* Set once it has been finalized so we consider it to be output.  */
  bool finalized;
  /* Set when function is scheduled to be assembled.  */
  bool output;
  /* Set for aliases once they got through assemble_alias.  */
  bool alias;
};

extern GTY(()) struct cgraph_node *cgraph_nodes;
extern GTY(()) int cgraph_n_nodes;
extern GTY(()) int cgraph_max_uid;
extern bool cgraph_global_info_ready;
extern GTY(()) struct cgraph_node *cgraph_nodes_queue;

extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_first_unanalyzed_node;
extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_nodes_queue;

/* In cgraph.c  */
void dump_cgraph (FILE *);
void dump_cgraph_node (FILE *, struct cgraph_node *);
void dump_varpool (FILE *);
void dump_cgraph_varpool_node (FILE *, struct cgraph_varpool_node *);
void cgraph_remove_edge (struct cgraph_edge *);
void cgraph_remove_node (struct cgraph_node *);
void cgraph_node_remove_callees (struct cgraph_node *node);
struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
					struct cgraph_node *,
				        tree, gcov_type, int);
struct cgraph_node *cgraph_node (tree);
struct cgraph_node *cgraph_node_for_asm (tree asmname);
struct cgraph_edge *cgraph_edge (struct cgraph_node *, tree);
struct cgraph_local_info *cgraph_local_info (tree);
struct cgraph_global_info *cgraph_global_info (tree);
struct cgraph_rtl_info *cgraph_rtl_info (tree);
const char * cgraph_node_name (struct cgraph_node *);
struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *, struct cgraph_node *, tree, int, int);
struct cgraph_node * cgraph_clone_node (struct cgraph_node *, gcov_type, int);

struct cgraph_varpool_node *cgraph_varpool_node (tree);
struct cgraph_varpool_node *cgraph_varpool_node_for_asm (tree asmname);
void cgraph_varpool_mark_needed_node (struct cgraph_varpool_node *);
void cgraph_varpool_finalize_decl (tree);
void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);

bool cgraph_function_possibly_inlined_p (tree);
void cgraph_unnest_node (struct cgraph_node *);
void cgraph_varpool_enqueue_needed_node (struct cgraph_varpool_node *);
void cgraph_varpool_reset_queue (void);
bool decide_is_variable_needed (struct cgraph_varpool_node *, tree);

/* In cgraphunit.c  */
bool cgraph_assemble_pending_functions (void);
bool cgraph_varpool_assemble_pending_decls (void);
void cgraph_finalize_function (tree, bool);
void cgraph_lower_function (struct cgraph_node *);
void cgraph_finalize_compilation_unit (void);
void cgraph_optimize (void);
void cgraph_mark_needed_node (struct cgraph_node *);
void cgraph_mark_reachable_node (struct cgraph_node *);
bool cgraph_inline_p (struct cgraph_edge *, const char **reason);
bool cgraph_preserve_function_body_p (tree);
void verify_cgraph (void);
void verify_cgraph_node (struct cgraph_node *);
void cgraph_mark_inline_edge (struct cgraph_edge *e);
void cgraph_clone_inlined_nodes (struct cgraph_edge *e, bool duplicate);
void cgraph_build_static_cdtor (char which, tree body, int priority);
void cgraph_reset_static_var_maps (void);
void init_cgraph (void);

/* In ipa.c  */
bool cgraph_remove_unreachable_nodes (bool, FILE *);
int cgraph_postorder (struct cgraph_node **);

/* In ipa-inline.c  */
void cgraph_decide_inlining_incrementally (struct cgraph_node *);
void cgraph_clone_inlined_nodes (struct cgraph_edge *, bool);
void cgraph_mark_inline_edge (struct cgraph_edge *);
bool cgraph_default_inline_p (struct cgraph_node *);
#endif  /* GCC_CGRAPH_H  */
