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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc1/] [gcc/] [ipa.c] - Diff between revs 280 and 338

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/* Basic IPA optimizations and utilities.
/* Basic IPA optimizations and utilities.
   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
   Free Software Foundation, Inc.
   Free Software Foundation, Inc.
 
 
This file is part of GCC.
This file is part of GCC.
 
 
GCC is free software; you can redistribute it and/or modify it under
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
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
Software Foundation; either version 3, or (at your option) any later
version.
version.
 
 
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.
for more details.
 
 
You should have received a copy of the GNU General Public License
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */
<http://www.gnu.org/licenses/>.  */
 
 
#include "config.h"
#include "config.h"
#include "system.h"
#include "system.h"
#include "coretypes.h"
#include "coretypes.h"
#include "tm.h"
#include "tm.h"
#include "cgraph.h"
#include "cgraph.h"
#include "tree-pass.h"
#include "tree-pass.h"
#include "timevar.h"
#include "timevar.h"
#include "gimple.h"
#include "gimple.h"
#include "ggc.h"
#include "ggc.h"
 
 
/* Fill array order with all nodes with output flag set in the reverse
/* Fill array order with all nodes with output flag set in the reverse
   topological order.  */
   topological order.  */
 
 
int
int
cgraph_postorder (struct cgraph_node **order)
cgraph_postorder (struct cgraph_node **order)
{
{
  struct cgraph_node *node, *node2;
  struct cgraph_node *node, *node2;
  int stack_size = 0;
  int stack_size = 0;
  int order_pos = 0;
  int order_pos = 0;
  struct cgraph_edge *edge, last;
  struct cgraph_edge *edge, last;
  int pass;
  int pass;
 
 
  struct cgraph_node **stack =
  struct cgraph_node **stack =
    XCNEWVEC (struct cgraph_node *, cgraph_n_nodes);
    XCNEWVEC (struct cgraph_node *, cgraph_n_nodes);
 
 
  /* We have to deal with cycles nicely, so use a depth first traversal
  /* We have to deal with cycles nicely, so use a depth first traversal
     output algorithm.  Ignore the fact that some functions won't need
     output algorithm.  Ignore the fact that some functions won't need
     to be output and put them into order as well, so we get dependencies
     to be output and put them into order as well, so we get dependencies
     right through inline functions.  */
     right through inline functions.  */
  for (node = cgraph_nodes; node; node = node->next)
  for (node = cgraph_nodes; node; node = node->next)
    node->aux = NULL;
    node->aux = NULL;
  for (pass = 0; pass < 2; pass++)
  for (pass = 0; pass < 2; pass++)
    for (node = cgraph_nodes; node; node = node->next)
    for (node = cgraph_nodes; node; node = node->next)
      if (!node->aux
      if (!node->aux
          && (pass
          && (pass
              || (!cgraph_only_called_directly_p (node)
              || (!cgraph_only_called_directly_p (node)
                  && !node->address_taken)))
                  && !node->address_taken)))
        {
        {
          node2 = node;
          node2 = node;
          if (!node->callers)
          if (!node->callers)
            node->aux = &last;
            node->aux = &last;
          else
          else
            node->aux = node->callers;
            node->aux = node->callers;
          while (node2)
          while (node2)
            {
            {
              while (node2->aux != &last)
              while (node2->aux != &last)
                {
                {
                  edge = (struct cgraph_edge *) node2->aux;
                  edge = (struct cgraph_edge *) node2->aux;
                  if (edge->next_caller)
                  if (edge->next_caller)
                    node2->aux = edge->next_caller;
                    node2->aux = edge->next_caller;
                  else
                  else
                    node2->aux = &last;
                    node2->aux = &last;
                  if (!edge->caller->aux)
                  if (!edge->caller->aux)
                    {
                    {
                      if (!edge->caller->callers)
                      if (!edge->caller->callers)
                        edge->caller->aux = &last;
                        edge->caller->aux = &last;
                      else
                      else
                        edge->caller->aux = edge->caller->callers;
                        edge->caller->aux = edge->caller->callers;
                      stack[stack_size++] = node2;
                      stack[stack_size++] = node2;
                      node2 = edge->caller;
                      node2 = edge->caller;
                      break;
                      break;
                    }
                    }
                }
                }
              if (node2->aux == &last)
              if (node2->aux == &last)
                {
                {
                  order[order_pos++] = node2;
                  order[order_pos++] = node2;
                  if (stack_size)
                  if (stack_size)
                    node2 = stack[--stack_size];
                    node2 = stack[--stack_size];
                  else
                  else
                    node2 = NULL;
                    node2 = NULL;
                }
                }
            }
            }
        }
        }
  free (stack);
  free (stack);
  for (node = cgraph_nodes; node; node = node->next)
  for (node = cgraph_nodes; node; node = node->next)
    node->aux = NULL;
    node->aux = NULL;
  return order_pos;
  return order_pos;
}
}
 
 
/* Look for all functions inlined to NODE and update their inlined_to pointers
/* Look for all functions inlined to NODE and update their inlined_to pointers
   to INLINED_TO.  */
   to INLINED_TO.  */
 
 
static void
static void
update_inlined_to_pointer (struct cgraph_node *node, struct cgraph_node *inlined_to)
update_inlined_to_pointer (struct cgraph_node *node, struct cgraph_node *inlined_to)
{
{
  struct cgraph_edge *e;
  struct cgraph_edge *e;
  for (e = node->callees; e; e = e->next_callee)
  for (e = node->callees; e; e = e->next_callee)
    if (e->callee->global.inlined_to)
    if (e->callee->global.inlined_to)
      {
      {
        e->callee->global.inlined_to = inlined_to;
        e->callee->global.inlined_to = inlined_to;
        update_inlined_to_pointer (e->callee, inlined_to);
        update_inlined_to_pointer (e->callee, inlined_to);
      }
      }
}
}
 
 
/* Perform reachability analysis and reclaim all unreachable nodes.
/* Perform reachability analysis and reclaim all unreachable nodes.
   If BEFORE_INLINING_P is true this function is called before inlining
   If BEFORE_INLINING_P is true this function is called before inlining
   decisions has been made.  If BEFORE_INLINING_P is false this function also
   decisions has been made.  If BEFORE_INLINING_P is false this function also
   removes unneeded bodies of extern inline functions.  */
   removes unneeded bodies of extern inline functions.  */
 
 
bool
bool
cgraph_remove_unreachable_nodes (bool before_inlining_p, FILE *file)
cgraph_remove_unreachable_nodes (bool before_inlining_p, FILE *file)
{
{
  struct cgraph_node *first = (struct cgraph_node *) (void *) 1;
  struct cgraph_node *first = (struct cgraph_node *) (void *) 1;
  struct cgraph_node *processed = (struct cgraph_node *) (void *) 2;
  struct cgraph_node *processed = (struct cgraph_node *) (void *) 2;
  struct cgraph_node *node, *next;
  struct cgraph_node *node, *next;
  bool changed = false;
  bool changed = false;
 
 
#ifdef ENABLE_CHECKING
#ifdef ENABLE_CHECKING
  verify_cgraph ();
  verify_cgraph ();
#endif
#endif
  if (file)
  if (file)
    fprintf (file, "\nReclaiming functions:");
    fprintf (file, "\nReclaiming functions:");
#ifdef ENABLE_CHECKING
#ifdef ENABLE_CHECKING
  for (node = cgraph_nodes; node; node = node->next)
  for (node = cgraph_nodes; node; node = node->next)
    gcc_assert (!node->aux);
    gcc_assert (!node->aux);
#endif
#endif
  for (node = cgraph_nodes; node; node = node->next)
  for (node = cgraph_nodes; node; node = node->next)
    if (!cgraph_can_remove_if_no_direct_calls_p (node)
    if (!cgraph_can_remove_if_no_direct_calls_p (node)
        && ((!DECL_EXTERNAL (node->decl))
        && ((!DECL_EXTERNAL (node->decl))
            || !node->analyzed
            || !node->analyzed
            || before_inlining_p))
            || before_inlining_p))
      {
      {
        gcc_assert (!node->global.inlined_to);
        gcc_assert (!node->global.inlined_to);
        node->aux = first;
        node->aux = first;
        first = node;
        first = node;
        node->reachable = true;
        node->reachable = true;
      }
      }
    else
    else
      {
      {
        gcc_assert (!node->aux);
        gcc_assert (!node->aux);
        node->reachable = false;
        node->reachable = false;
      }
      }
 
 
  /* Perform reachability analysis.  As a special case do not consider
  /* Perform reachability analysis.  As a special case do not consider
     extern inline functions not inlined as live because we won't output
     extern inline functions not inlined as live because we won't output
     them at all.  */
     them at all.  */
  while (first != (void *) 1)
  while (first != (void *) 1)
    {
    {
      struct cgraph_edge *e;
      struct cgraph_edge *e;
      node = first;
      node = first;
      first = (struct cgraph_node *) first->aux;
      first = (struct cgraph_node *) first->aux;
      node->aux = processed;
      node->aux = processed;
 
 
      if (node->reachable)
      if (node->reachable)
        for (e = node->callees; e; e = e->next_callee)
        for (e = node->callees; e; e = e->next_callee)
          if (!e->callee->reachable
          if (!e->callee->reachable
              && node->analyzed
              && node->analyzed
              && (!e->inline_failed || !e->callee->analyzed
              && (!e->inline_failed || !e->callee->analyzed
                  || (!DECL_EXTERNAL (e->callee->decl))
                  || (!DECL_EXTERNAL (e->callee->decl))
                  || before_inlining_p))
                  || before_inlining_p))
            {
            {
              bool prev_reachable = e->callee->reachable;
              bool prev_reachable = e->callee->reachable;
              e->callee->reachable |= node->reachable;
              e->callee->reachable |= node->reachable;
              if (!e->callee->aux
              if (!e->callee->aux
                  || (e->callee->aux == processed
                  || (e->callee->aux == processed
                      && prev_reachable != e->callee->reachable))
                      && prev_reachable != e->callee->reachable))
                {
                {
                  e->callee->aux = first;
                  e->callee->aux = first;
                  first = e->callee;
                  first = e->callee;
                }
                }
            }
            }
 
 
      /* If any function in a comdat group is reachable, force
      /* If any function in a comdat group is reachable, force
         all other functions in the same comdat group to be
         all other functions in the same comdat group to be
         also reachable.  */
         also reachable.  */
      if (node->same_comdat_group
      if (node->same_comdat_group
          && node->reachable
          && node->reachable
          && !node->global.inlined_to)
          && !node->global.inlined_to)
        {
        {
          for (next = node->same_comdat_group;
          for (next = node->same_comdat_group;
               next != node;
               next != node;
               next = next->same_comdat_group)
               next = next->same_comdat_group)
            if (!next->reachable)
            if (!next->reachable)
              {
              {
                next->aux = first;
                next->aux = first;
                first = next;
                first = next;
                next->reachable = true;
                next->reachable = true;
              }
              }
        }
        }
 
 
      /* We can freely remove inline clones even if they are cloned, however if
      /* We can freely remove inline clones even if they are cloned, however if
         function is clone of real clone, we must keep it around in order to
         function is clone of real clone, we must keep it around in order to
         make materialize_clones produce function body with the changes
         make materialize_clones produce function body with the changes
         applied.  */
         applied.  */
      while (node->clone_of && !node->clone_of->aux && !gimple_has_body_p (node->decl))
      while (node->clone_of && !node->clone_of->aux && !gimple_has_body_p (node->decl))
        {
        {
          bool noninline = node->clone_of->decl != node->decl;
          bool noninline = node->clone_of->decl != node->decl;
          node = node->clone_of;
          node = node->clone_of;
          if (noninline)
          if (noninline)
            {
            {
              node->aux = first;
              node->aux = first;
              first = node;
              first = node;
              break;
              break;
            }
            }
        }
        }
    }
    }
 
 
  /* Remove unreachable nodes.  Extern inline functions need special care;
  /* Remove unreachable nodes.  Extern inline functions need special care;
     Unreachable extern inline functions shall be removed.
     Unreachable extern inline functions shall be removed.
     Reachable extern inline functions we never inlined shall get their bodies
     Reachable extern inline functions we never inlined shall get their bodies
     eliminated.
     eliminated.
     Reachable extern inline functions we sometimes inlined will be turned into
     Reachable extern inline functions we sometimes inlined will be turned into
     unanalyzed nodes so they look like for true extern functions to the rest
     unanalyzed nodes so they look like for true extern functions to the rest
     of code.  Body of such functions is released via remove_node once the
     of code.  Body of such functions is released via remove_node once the
     inline clones are eliminated.  */
     inline clones are eliminated.  */
  for (node = cgraph_nodes; node; node = next)
  for (node = cgraph_nodes; node; node = next)
    {
    {
      next = node->next;
      next = node->next;
      if (node->aux && !node->reachable)
      if (node->aux && !node->reachable)
        {
        {
          cgraph_node_remove_callees (node);
          cgraph_node_remove_callees (node);
          node->analyzed = false;
          node->analyzed = false;
          node->local.inlinable = false;
          node->local.inlinable = false;
        }
        }
      if (!node->aux)
      if (!node->aux)
        {
        {
          node->global.inlined_to = NULL;
          node->global.inlined_to = NULL;
          if (file)
          if (file)
            fprintf (file, " %s", cgraph_node_name (node));
            fprintf (file, " %s", cgraph_node_name (node));
          if (!node->analyzed || !DECL_EXTERNAL (node->decl) || before_inlining_p)
          if (!node->analyzed || !DECL_EXTERNAL (node->decl) || before_inlining_p)
            cgraph_remove_node (node);
            cgraph_remove_node (node);
          else
          else
            {
            {
              struct cgraph_edge *e;
              struct cgraph_edge *e;
 
 
              /* See if there is reachable caller.  */
              /* See if there is reachable caller.  */
              for (e = node->callers; e; e = e->next_caller)
              for (e = node->callers; e; e = e->next_caller)
                if (e->caller->aux)
                if (e->caller->aux)
                  break;
                  break;
 
 
              /* If so, we need to keep node in the callgraph.  */
              /* If so, we need to keep node in the callgraph.  */
              if (e || node->needed)
              if (e || node->needed)
                {
                {
                  struct cgraph_node *clone;
                  struct cgraph_node *clone;
 
 
                  /* If there are still clones, we must keep body around.
                  /* If there are still clones, we must keep body around.
                     Otherwise we can just remove the body but keep the clone.  */
                     Otherwise we can just remove the body but keep the clone.  */
                  for (clone = node->clones; clone;
                  for (clone = node->clones; clone;
                       clone = clone->next_sibling_clone)
                       clone = clone->next_sibling_clone)
                    if (clone->aux)
                    if (clone->aux)
                      break;
                      break;
                  if (!clone)
                  if (!clone)
                    {
                    {
                      cgraph_release_function_body (node);
                      cgraph_release_function_body (node);
                      node->analyzed = false;
                      node->analyzed = false;
                      node->local.inlinable = false;
                      node->local.inlinable = false;
                    }
                    }
                  cgraph_node_remove_callees (node);
                  cgraph_node_remove_callees (node);
                  if (node->prev_sibling_clone)
                  if (node->prev_sibling_clone)
                    node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone;
                    node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone;
                  else if (node->clone_of)
                  else if (node->clone_of)
                    node->clone_of->clones = node->next_sibling_clone;
                    node->clone_of->clones = node->next_sibling_clone;
                  if (node->next_sibling_clone)
                  if (node->next_sibling_clone)
                    node->next_sibling_clone->prev_sibling_clone = node->prev_sibling_clone;
                    node->next_sibling_clone->prev_sibling_clone = node->prev_sibling_clone;
                  node->clone_of = NULL;
                  node->clone_of = NULL;
                  node->next_sibling_clone = NULL;
                  node->next_sibling_clone = NULL;
                  node->prev_sibling_clone = NULL;
                  node->prev_sibling_clone = NULL;
                }
                }
              else
              else
                cgraph_remove_node (node);
                cgraph_remove_node (node);
            }
            }
          changed = true;
          changed = true;
        }
        }
    }
    }
  for (node = cgraph_nodes; node; node = node->next)
  for (node = cgraph_nodes; node; node = node->next)
    {
    {
      /* Inline clones might be kept around so their materializing allows further
      /* Inline clones might be kept around so their materializing allows further
         cloning.  If the function the clone is inlined into is removed, we need
         cloning.  If the function the clone is inlined into is removed, we need
         to turn it into normal cone.  */
         to turn it into normal cone.  */
      if (node->global.inlined_to
      if (node->global.inlined_to
          && !node->callers)
          && !node->callers)
        {
        {
          gcc_assert (node->clones);
          gcc_assert (node->clones);
          node->global.inlined_to = NULL;
          node->global.inlined_to = NULL;
          update_inlined_to_pointer (node, node);
          update_inlined_to_pointer (node, node);
        }
        }
      node->aux = NULL;
      node->aux = NULL;
    }
    }
#ifdef ENABLE_CHECKING
#ifdef ENABLE_CHECKING
  verify_cgraph ();
  verify_cgraph ();
#endif
#endif
 
 
  /* Reclaim alias pairs for functions that have disappeared from the
  /* Reclaim alias pairs for functions that have disappeared from the
     call graph.  */
     call graph.  */
  remove_unreachable_alias_pairs ();
  remove_unreachable_alias_pairs ();
 
 
  return changed;
  return changed;
}
}
 
 
static bool
static bool
cgraph_externally_visible_p (struct cgraph_node *node, bool whole_program)
cgraph_externally_visible_p (struct cgraph_node *node, bool whole_program)
{
{
  if (!node->local.finalized)
  if (!node->local.finalized)
    return false;
    return false;
  if (!DECL_COMDAT (node->decl)
  if (!DECL_COMDAT (node->decl)
      && (!TREE_PUBLIC (node->decl) || DECL_EXTERNAL (node->decl)))
      && (!TREE_PUBLIC (node->decl) || DECL_EXTERNAL (node->decl)))
    return false;
    return false;
  if (!whole_program)
  if (!whole_program)
    return true;
    return true;
  if (DECL_PRESERVE_P (node->decl))
  if (DECL_PRESERVE_P (node->decl))
    return true;
    return true;
  /* COMDAT functions must be shared only if they have address taken,
  /* COMDAT functions must be shared only if they have address taken,
     otherwise we can produce our own private implementation with
     otherwise we can produce our own private implementation with
     -fwhole-program.  */
     -fwhole-program.  */
  if (DECL_COMDAT (node->decl))
  if (DECL_COMDAT (node->decl))
    {
    {
      if (node->address_taken || !node->analyzed)
      if (node->address_taken || !node->analyzed)
        return true;
        return true;
      if (node->same_comdat_group)
      if (node->same_comdat_group)
        {
        {
          struct cgraph_node *next;
          struct cgraph_node *next;
 
 
          /* If more than one function is in the same COMDAT group, it must
          /* If more than one function is in the same COMDAT group, it must
             be shared even if just one function in the comdat group has
             be shared even if just one function in the comdat group has
             address taken.  */
             address taken.  */
          for (next = node->same_comdat_group;
          for (next = node->same_comdat_group;
               next != node;
               next != node;
               next = next->same_comdat_group)
               next = next->same_comdat_group)
            if (next->address_taken || !next->analyzed)
            if (next->address_taken || !next->analyzed)
              return true;
              return true;
        }
        }
    }
    }
  if (MAIN_NAME_P (DECL_NAME (node->decl)))
  if (MAIN_NAME_P (DECL_NAME (node->decl)))
    return true;
    return true;
  if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (node->decl)))
  if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (node->decl)))
    return true;
    return true;
  return false;
  return false;
}
}
 
 
/* Dissolve the same_comdat_group list in which NODE resides.  */
/* Dissolve the same_comdat_group list in which NODE resides.  */
 
 
static void
static void
dissolve_same_comdat_group_list (struct cgraph_node *node)
dissolve_same_comdat_group_list (struct cgraph_node *node)
{
{
  struct cgraph_node *n = node, *next;
  struct cgraph_node *n = node, *next;
  do
  do
    {
    {
      next = n->same_comdat_group;
      next = n->same_comdat_group;
      n->same_comdat_group = NULL;
      n->same_comdat_group = NULL;
      n = next;
      n = next;
    }
    }
  while (n != node);
  while (n != node);
}
}
 
 
/* Mark visibility of all functions.
/* Mark visibility of all functions.
 
 
   A local function is one whose calls can occur only in the current
   A local function is one whose calls can occur only in the current
   compilation unit and all its calls are explicit, so we can change
   compilation unit and all its calls are explicit, so we can change
   its calling convention.  We simply mark all static functions whose
   its calling convention.  We simply mark all static functions whose
   address is not taken as local.
   address is not taken as local.
 
 
   We also change the TREE_PUBLIC flag of all declarations that are public
   We also change the TREE_PUBLIC flag of all declarations that are public
   in language point of view but we want to overwrite this default
   in language point of view but we want to overwrite this default
   via visibilities for the backend point of view.  */
   via visibilities for the backend point of view.  */
 
 
static unsigned int
static unsigned int
function_and_variable_visibility (bool whole_program)
function_and_variable_visibility (bool whole_program)
{
{
  struct cgraph_node *node;
  struct cgraph_node *node;
  struct varpool_node *vnode;
  struct varpool_node *vnode;
 
 
  for (node = cgraph_nodes; node; node = node->next)
  for (node = cgraph_nodes; node; node = node->next)
    {
    {
      /* C++ FE on lack of COMDAT support create local COMDAT functions
      /* C++ FE on lack of COMDAT support create local COMDAT functions
         (that ought to be shared but can not due to object format
         (that ought to be shared but can not due to object format
         limitations).  It is neccesary to keep the flag to make rest of C++ FE
         limitations).  It is neccesary to keep the flag to make rest of C++ FE
         happy.  Clear the flag here to avoid confusion in middle-end.  */
         happy.  Clear the flag here to avoid confusion in middle-end.  */
      if (DECL_COMDAT (node->decl) && !TREE_PUBLIC (node->decl))
      if (DECL_COMDAT (node->decl) && !TREE_PUBLIC (node->decl))
        DECL_COMDAT (node->decl) = 0;
        DECL_COMDAT (node->decl) = 0;
      /* For external decls stop tracking same_comdat_group, it doesn't matter
      /* For external decls stop tracking same_comdat_group, it doesn't matter
         what comdat group they are in when they won't be emitted in this TU,
         what comdat group they are in when they won't be emitted in this TU,
         and simplifies later passes.  */
         and simplifies later passes.  */
      if (node->same_comdat_group && DECL_EXTERNAL (node->decl))
      if (node->same_comdat_group && DECL_EXTERNAL (node->decl))
        {
        {
#ifdef ENABLE_CHECKING
#ifdef ENABLE_CHECKING
          struct cgraph_node *n;
          struct cgraph_node *n;
 
 
          for (n = node->same_comdat_group;
          for (n = node->same_comdat_group;
               n != node;
               n != node;
               n = n->same_comdat_group)
               n = n->same_comdat_group)
              /* If at least one of same comdat group functions is external,
              /* If at least one of same comdat group functions is external,
                 all of them have to be, otherwise it is a front-end bug.  */
                 all of them have to be, otherwise it is a front-end bug.  */
              gcc_assert (DECL_EXTERNAL (n->decl));
              gcc_assert (DECL_EXTERNAL (n->decl));
#endif
#endif
          dissolve_same_comdat_group_list (node);
          dissolve_same_comdat_group_list (node);
        }
        }
      gcc_assert ((!DECL_WEAK (node->decl) && !DECL_COMDAT (node->decl))
      gcc_assert ((!DECL_WEAK (node->decl) && !DECL_COMDAT (node->decl))
                  || TREE_PUBLIC (node->decl) || DECL_EXTERNAL (node->decl));
                  || TREE_PUBLIC (node->decl) || DECL_EXTERNAL (node->decl));
      if (cgraph_externally_visible_p (node, whole_program))
      if (cgraph_externally_visible_p (node, whole_program))
        {
        {
          gcc_assert (!node->global.inlined_to);
          gcc_assert (!node->global.inlined_to);
          node->local.externally_visible = true;
          node->local.externally_visible = true;
        }
        }
      else
      else
        node->local.externally_visible = false;
        node->local.externally_visible = false;
      if (!node->local.externally_visible && node->analyzed
      if (!node->local.externally_visible && node->analyzed
          && !DECL_EXTERNAL (node->decl))
          && !DECL_EXTERNAL (node->decl))
        {
        {
          gcc_assert (whole_program || !TREE_PUBLIC (node->decl));
          gcc_assert (whole_program || !TREE_PUBLIC (node->decl));
          cgraph_make_decl_local (node->decl);
          cgraph_make_decl_local (node->decl);
          if (node->same_comdat_group)
          if (node->same_comdat_group)
            /* cgraph_externally_visible_p has already checked all other nodes
            /* cgraph_externally_visible_p has already checked all other nodes
               in the group and they will all be made local.  We need to
               in the group and they will all be made local.  We need to
               dissolve the group at once so that the predicate does not
               dissolve the group at once so that the predicate does not
               segfault though. */
               segfault though. */
            dissolve_same_comdat_group_list (node);
            dissolve_same_comdat_group_list (node);
        }
        }
      node->local.local = (cgraph_only_called_directly_p (node)
      node->local.local = (cgraph_only_called_directly_p (node)
                           && node->analyzed
                           && node->analyzed
                           && !DECL_EXTERNAL (node->decl)
                           && !DECL_EXTERNAL (node->decl)
                           && !node->local.externally_visible);
                           && !node->local.externally_visible);
    }
    }
  for (vnode = varpool_nodes; vnode; vnode = vnode->next)
  for (vnode = varpool_nodes; vnode; vnode = vnode->next)
    {
    {
      /* weak flag makes no sense on local variables.  */
      /* weak flag makes no sense on local variables.  */
      gcc_assert (!DECL_WEAK (vnode->decl)
      gcc_assert (!DECL_WEAK (vnode->decl)
                  || TREE_PUBLIC (vnode->decl) || DECL_EXTERNAL (vnode->decl));
                  || TREE_PUBLIC (vnode->decl) || DECL_EXTERNAL (vnode->decl));
      /* In several cases declarations can not be common:
      /* In several cases declarations can not be common:
 
 
         - when declaration has initializer
         - when declaration has initializer
         - when it is in weak
         - when it is in weak
         - when it has specific section
         - when it has specific section
         - when it resides in non-generic address space.
         - when it resides in non-generic address space.
         - if declaration is local, it will get into .local common section
         - if declaration is local, it will get into .local common section
           so common flag is not needed.  Frontends still produce these in
           so common flag is not needed.  Frontends still produce these in
           certain cases, such as for:
           certain cases, such as for:
 
 
             static int a __attribute__ ((common))
             static int a __attribute__ ((common))
 
 
         Canonicalize things here and clear the redundant flag.  */
         Canonicalize things here and clear the redundant flag.  */
      if (DECL_COMMON (vnode->decl)
      if (DECL_COMMON (vnode->decl)
          && (!(TREE_PUBLIC (vnode->decl) || DECL_EXTERNAL (vnode->decl))
          && (!(TREE_PUBLIC (vnode->decl) || DECL_EXTERNAL (vnode->decl))
              || (DECL_INITIAL (vnode->decl)
              || (DECL_INITIAL (vnode->decl)
                  && DECL_INITIAL (vnode->decl) != error_mark_node)
                  && DECL_INITIAL (vnode->decl) != error_mark_node)
              || DECL_WEAK (vnode->decl)
              || DECL_WEAK (vnode->decl)
              || DECL_SECTION_NAME (vnode->decl) != NULL
              || DECL_SECTION_NAME (vnode->decl) != NULL
              || ! (ADDR_SPACE_GENERIC_P
              || ! (ADDR_SPACE_GENERIC_P
                    (TYPE_ADDR_SPACE (TREE_TYPE (vnode->decl))))))
                    (TYPE_ADDR_SPACE (TREE_TYPE (vnode->decl))))))
        DECL_COMMON (vnode->decl) = 0;
        DECL_COMMON (vnode->decl) = 0;
    }
    }
  for (vnode = varpool_nodes_queue; vnode; vnode = vnode->next_needed)
  for (vnode = varpool_nodes_queue; vnode; vnode = vnode->next_needed)
    {
    {
      if (!vnode->finalized)
      if (!vnode->finalized)
        continue;
        continue;
      if (vnode->needed
      if (vnode->needed
          && (DECL_COMDAT (vnode->decl) || TREE_PUBLIC (vnode->decl))
          && (DECL_COMDAT (vnode->decl) || TREE_PUBLIC (vnode->decl))
          && (!whole_program
          && (!whole_program
              /* We can privatize comdat readonly variables whose address is not taken,
              /* We can privatize comdat readonly variables whose address is not taken,
                 but doing so is not going to bring us optimization oppurtunities until
                 but doing so is not going to bring us optimization oppurtunities until
                 we start reordering datastructures.  */
                 we start reordering datastructures.  */
              || DECL_COMDAT (vnode->decl)
              || DECL_COMDAT (vnode->decl)
              || DECL_WEAK (vnode->decl)
              || DECL_WEAK (vnode->decl)
              || lookup_attribute ("externally_visible",
              || lookup_attribute ("externally_visible",
                                   DECL_ATTRIBUTES (vnode->decl))))
                                   DECL_ATTRIBUTES (vnode->decl))))
        vnode->externally_visible = true;
        vnode->externally_visible = true;
      else
      else
        vnode->externally_visible = false;
        vnode->externally_visible = false;
      if (!vnode->externally_visible)
      if (!vnode->externally_visible)
        {
        {
          gcc_assert (whole_program || !TREE_PUBLIC (vnode->decl));
          gcc_assert (whole_program || !TREE_PUBLIC (vnode->decl));
          cgraph_make_decl_local (vnode->decl);
          cgraph_make_decl_local (vnode->decl);
        }
        }
     gcc_assert (TREE_STATIC (vnode->decl));
     gcc_assert (TREE_STATIC (vnode->decl));
    }
    }
 
 
  if (dump_file)
  if (dump_file)
    {
    {
      fprintf (dump_file, "\nMarking local functions:");
      fprintf (dump_file, "\nMarking local functions:");
      for (node = cgraph_nodes; node; node = node->next)
      for (node = cgraph_nodes; node; node = node->next)
        if (node->local.local)
        if (node->local.local)
          fprintf (dump_file, " %s", cgraph_node_name (node));
          fprintf (dump_file, " %s", cgraph_node_name (node));
      fprintf (dump_file, "\n\n");
      fprintf (dump_file, "\n\n");
      fprintf (dump_file, "\nMarking externally visible functions:");
      fprintf (dump_file, "\nMarking externally visible functions:");
      for (node = cgraph_nodes; node; node = node->next)
      for (node = cgraph_nodes; node; node = node->next)
        if (node->local.externally_visible)
        if (node->local.externally_visible)
          fprintf (dump_file, " %s", cgraph_node_name (node));
          fprintf (dump_file, " %s", cgraph_node_name (node));
      fprintf (dump_file, "\n\n");
      fprintf (dump_file, "\n\n");
      fprintf (dump_file, "\nMarking externally visible variables:");
      fprintf (dump_file, "\nMarking externally visible variables:");
      for (vnode = varpool_nodes_queue; vnode; vnode = vnode->next_needed)
      for (vnode = varpool_nodes_queue; vnode; vnode = vnode->next_needed)
        if (vnode->externally_visible)
        if (vnode->externally_visible)
          fprintf (dump_file, " %s", varpool_node_name (vnode));
          fprintf (dump_file, " %s", varpool_node_name (vnode));
      fprintf (dump_file, "\n\n");
      fprintf (dump_file, "\n\n");
    }
    }
  cgraph_function_flags_ready = true;
  cgraph_function_flags_ready = true;
  return 0;
  return 0;
}
}
 
 
/* Local function pass handling visibilities.  This happens before LTO streaming
/* Local function pass handling visibilities.  This happens before LTO streaming
   so in particular -fwhole-program should be ignored at this level.  */
   so in particular -fwhole-program should be ignored at this level.  */
 
 
static unsigned int
static unsigned int
local_function_and_variable_visibility (void)
local_function_and_variable_visibility (void)
{
{
  return function_and_variable_visibility (flag_whole_program && !flag_lto && !flag_whopr);
  return function_and_variable_visibility (flag_whole_program && !flag_lto && !flag_whopr);
}
}
 
 
struct simple_ipa_opt_pass pass_ipa_function_and_variable_visibility =
struct simple_ipa_opt_pass pass_ipa_function_and_variable_visibility =
{
{
 {
 {
  SIMPLE_IPA_PASS,
  SIMPLE_IPA_PASS,
  "visibility",                         /* name */
  "visibility",                         /* name */
  NULL,                                 /* gate */
  NULL,                                 /* gate */
  local_function_and_variable_visibility,/* execute */
  local_function_and_variable_visibility,/* execute */
  NULL,                                 /* sub */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  NULL,                                 /* next */
  0,                                     /* static_pass_number */
  0,                                     /* static_pass_number */
  TV_CGRAPHOPT,                         /* tv_id */
  TV_CGRAPHOPT,                         /* tv_id */
  0,                                     /* properties_required */
  0,                                     /* properties_required */
  0,                                     /* properties_provided */
  0,                                     /* properties_provided */
  0,                                     /* properties_destroyed */
  0,                                     /* properties_destroyed */
  0,                                     /* todo_flags_start */
  0,                                     /* todo_flags_start */
  TODO_remove_functions | TODO_dump_cgraph/* todo_flags_finish */
  TODO_remove_functions | TODO_dump_cgraph/* todo_flags_finish */
 }
 }
};
};
 
 
/* Do not re-run on ltrans stage.  */
/* Do not re-run on ltrans stage.  */
 
 
static bool
static bool
gate_whole_program_function_and_variable_visibility (void)
gate_whole_program_function_and_variable_visibility (void)
{
{
  return !flag_ltrans;
  return !flag_ltrans;
}
}
 
 
/* Bring functionss local at LTO time whith -fwhole-program.  */
/* Bring functionss local at LTO time whith -fwhole-program.  */
 
 
static unsigned int
static unsigned int
whole_program_function_and_variable_visibility (void)
whole_program_function_and_variable_visibility (void)
{
{
  struct cgraph_node *node;
  struct cgraph_node *node;
  struct varpool_node *vnode;
  struct varpool_node *vnode;
 
 
  function_and_variable_visibility (flag_whole_program);
  function_and_variable_visibility (flag_whole_program);
 
 
  for (node = cgraph_nodes; node; node = node->next)
  for (node = cgraph_nodes; node; node = node->next)
    if ((node->local.externally_visible && !DECL_COMDAT (node->decl))
    if ((node->local.externally_visible && !DECL_COMDAT (node->decl))
        && node->local.finalized)
        && node->local.finalized)
      cgraph_mark_needed_node (node);
      cgraph_mark_needed_node (node);
  for (vnode = varpool_nodes_queue; vnode; vnode = vnode->next_needed)
  for (vnode = varpool_nodes_queue; vnode; vnode = vnode->next_needed)
    if (vnode->externally_visible && !DECL_COMDAT (vnode->decl))
    if (vnode->externally_visible && !DECL_COMDAT (vnode->decl))
      varpool_mark_needed_node (vnode);
      varpool_mark_needed_node (vnode);
  if (dump_file)
  if (dump_file)
    {
    {
      fprintf (dump_file, "\nNeeded variables:");
      fprintf (dump_file, "\nNeeded variables:");
      for (vnode = varpool_nodes_queue; vnode; vnode = vnode->next_needed)
      for (vnode = varpool_nodes_queue; vnode; vnode = vnode->next_needed)
        if (vnode->needed)
        if (vnode->needed)
          fprintf (dump_file, " %s", varpool_node_name (vnode));
          fprintf (dump_file, " %s", varpool_node_name (vnode));
      fprintf (dump_file, "\n\n");
      fprintf (dump_file, "\n\n");
    }
    }
  return 0;
  return 0;
}
}
 
 
struct ipa_opt_pass_d pass_ipa_whole_program_visibility =
struct ipa_opt_pass_d pass_ipa_whole_program_visibility =
{
{
 {
 {
  IPA_PASS,
  IPA_PASS,
  "whole-program",                      /* name */
  "whole-program",                      /* name */
  gate_whole_program_function_and_variable_visibility,/* gate */
  gate_whole_program_function_and_variable_visibility,/* gate */
  whole_program_function_and_variable_visibility,/* execute */
  whole_program_function_and_variable_visibility,/* execute */
  NULL,                                 /* sub */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  NULL,                                 /* next */
  0,                                     /* static_pass_number */
  0,                                     /* static_pass_number */
  TV_CGRAPHOPT,                         /* tv_id */
  TV_CGRAPHOPT,                         /* tv_id */
  0,                                     /* properties_required */
  0,                                     /* properties_required */
  0,                                     /* properties_provided */
  0,                                     /* properties_provided */
  0,                                     /* properties_destroyed */
  0,                                     /* properties_destroyed */
  0,                                     /* todo_flags_start */
  0,                                     /* todo_flags_start */
  TODO_dump_cgraph | TODO_remove_functions/* todo_flags_finish */
  TODO_dump_cgraph | TODO_remove_functions/* todo_flags_finish */
 },
 },
 NULL,                                  /* generate_summary */
 NULL,                                  /* generate_summary */
 NULL,                                  /* write_summary */
 NULL,                                  /* write_summary */
 NULL,                                  /* read_summary */
 NULL,                                  /* read_summary */
 NULL,                                  /* function_read_summary */
 NULL,                                  /* function_read_summary */
 NULL,                                  /* stmt_fixup */
 NULL,                                  /* stmt_fixup */
 0,                                      /* TODOs */
 0,                                      /* TODOs */
 NULL,                                  /* function_transform */
 NULL,                                  /* function_transform */
 NULL,                                  /* variable_transform */
 NULL,                                  /* variable_transform */
};
};
 
 
/* Hash a cgraph node set element.  */
/* Hash a cgraph node set element.  */
 
 
static hashval_t
static hashval_t
hash_cgraph_node_set_element (const void *p)
hash_cgraph_node_set_element (const void *p)
{
{
  const_cgraph_node_set_element element = (const_cgraph_node_set_element) p;
  const_cgraph_node_set_element element = (const_cgraph_node_set_element) p;
  return htab_hash_pointer (element->node);
  return htab_hash_pointer (element->node);
}
}
 
 
/* Compare two cgraph node set elements.  */
/* Compare two cgraph node set elements.  */
 
 
static int
static int
eq_cgraph_node_set_element (const void *p1, const void *p2)
eq_cgraph_node_set_element (const void *p1, const void *p2)
{
{
  const_cgraph_node_set_element e1 = (const_cgraph_node_set_element) p1;
  const_cgraph_node_set_element e1 = (const_cgraph_node_set_element) p1;
  const_cgraph_node_set_element e2 = (const_cgraph_node_set_element) p2;
  const_cgraph_node_set_element e2 = (const_cgraph_node_set_element) p2;
 
 
  return e1->node == e2->node;
  return e1->node == e2->node;
}
}
 
 
/* Create a new cgraph node set.  */
/* Create a new cgraph node set.  */
 
 
cgraph_node_set
cgraph_node_set
cgraph_node_set_new (void)
cgraph_node_set_new (void)
{
{
  cgraph_node_set new_node_set;
  cgraph_node_set new_node_set;
 
 
  new_node_set = GGC_NEW (struct cgraph_node_set_def);
  new_node_set = GGC_NEW (struct cgraph_node_set_def);
  new_node_set->hashtab = htab_create_ggc (10,
  new_node_set->hashtab = htab_create_ggc (10,
                                           hash_cgraph_node_set_element,
                                           hash_cgraph_node_set_element,
                                           eq_cgraph_node_set_element,
                                           eq_cgraph_node_set_element,
                                           NULL);
                                           NULL);
  new_node_set->nodes = NULL;
  new_node_set->nodes = NULL;
  return new_node_set;
  return new_node_set;
}
}
 
 
/* Add cgraph_node NODE to cgraph_node_set SET.  */
/* Add cgraph_node NODE to cgraph_node_set SET.  */
 
 
void
void
cgraph_node_set_add (cgraph_node_set set, struct cgraph_node *node)
cgraph_node_set_add (cgraph_node_set set, struct cgraph_node *node)
{
{
  void **slot;
  void **slot;
  cgraph_node_set_element element;
  cgraph_node_set_element element;
  struct cgraph_node_set_element_def dummy;
  struct cgraph_node_set_element_def dummy;
 
 
  dummy.node = node;
  dummy.node = node;
  slot = htab_find_slot (set->hashtab, &dummy, INSERT);
  slot = htab_find_slot (set->hashtab, &dummy, INSERT);
 
 
  if (*slot != HTAB_EMPTY_ENTRY)
  if (*slot != HTAB_EMPTY_ENTRY)
    {
    {
      element = (cgraph_node_set_element) *slot;
      element = (cgraph_node_set_element) *slot;
      gcc_assert (node == element->node
      gcc_assert (node == element->node
                  && (VEC_index (cgraph_node_ptr, set->nodes, element->index)
                  && (VEC_index (cgraph_node_ptr, set->nodes, element->index)
                      == node));
                      == node));
      return;
      return;
    }
    }
 
 
  /* Insert node into hash table.  */
  /* Insert node into hash table.  */
  element =
  element =
    (cgraph_node_set_element) GGC_NEW (struct cgraph_node_set_element_def);
    (cgraph_node_set_element) GGC_NEW (struct cgraph_node_set_element_def);
  element->node = node;
  element->node = node;
  element->index = VEC_length (cgraph_node_ptr, set->nodes);
  element->index = VEC_length (cgraph_node_ptr, set->nodes);
  *slot = element;
  *slot = element;
 
 
  /* Insert into node vector.  */
  /* Insert into node vector.  */
  VEC_safe_push (cgraph_node_ptr, gc, set->nodes, node);
  VEC_safe_push (cgraph_node_ptr, gc, set->nodes, node);
}
}
 
 
/* Remove cgraph_node NODE from cgraph_node_set SET.  */
/* Remove cgraph_node NODE from cgraph_node_set SET.  */
 
 
void
void
cgraph_node_set_remove (cgraph_node_set set, struct cgraph_node *node)
cgraph_node_set_remove (cgraph_node_set set, struct cgraph_node *node)
{
{
  void **slot, **last_slot;
  void **slot, **last_slot;
  cgraph_node_set_element element, last_element;
  cgraph_node_set_element element, last_element;
  struct cgraph_node *last_node;
  struct cgraph_node *last_node;
  struct cgraph_node_set_element_def dummy;
  struct cgraph_node_set_element_def dummy;
 
 
  dummy.node = node;
  dummy.node = node;
  slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
  slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
  if (slot == NULL)
  if (slot == NULL)
    return;
    return;
 
 
  element = (cgraph_node_set_element) *slot;
  element = (cgraph_node_set_element) *slot;
  gcc_assert (VEC_index (cgraph_node_ptr, set->nodes, element->index)
  gcc_assert (VEC_index (cgraph_node_ptr, set->nodes, element->index)
              == node);
              == node);
 
 
  /* Remove from vector. We do this by swapping node with the last element
  /* Remove from vector. We do this by swapping node with the last element
     of the vector.  */
     of the vector.  */
  last_node = VEC_pop (cgraph_node_ptr, set->nodes);
  last_node = VEC_pop (cgraph_node_ptr, set->nodes);
  if (last_node != node)
  if (last_node != node)
    {
    {
      dummy.node = last_node;
      dummy.node = last_node;
      last_slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
      last_slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
      last_element = (cgraph_node_set_element) *last_slot;
      last_element = (cgraph_node_set_element) *last_slot;
      gcc_assert (last_element);
      gcc_assert (last_element);
 
 
      /* Move the last element to the original spot of NODE.  */
      /* Move the last element to the original spot of NODE.  */
      last_element->index = element->index;
      last_element->index = element->index;
      VEC_replace (cgraph_node_ptr, set->nodes, last_element->index,
      VEC_replace (cgraph_node_ptr, set->nodes, last_element->index,
                   last_node);
                   last_node);
    }
    }
 
 
  /* Remove element from hash table.  */
  /* Remove element from hash table.  */
  htab_clear_slot (set->hashtab, slot);
  htab_clear_slot (set->hashtab, slot);
  ggc_free (element);
  ggc_free (element);
}
}
 
 
/* Find NODE in SET and return an iterator to it if found.  A null iterator
/* Find NODE in SET and return an iterator to it if found.  A null iterator
   is returned if NODE is not in SET.  */
   is returned if NODE is not in SET.  */
 
 
cgraph_node_set_iterator
cgraph_node_set_iterator
cgraph_node_set_find (cgraph_node_set set, struct cgraph_node *node)
cgraph_node_set_find (cgraph_node_set set, struct cgraph_node *node)
{
{
  void **slot;
  void **slot;
  struct cgraph_node_set_element_def dummy;
  struct cgraph_node_set_element_def dummy;
  cgraph_node_set_element element;
  cgraph_node_set_element element;
  cgraph_node_set_iterator csi;
  cgraph_node_set_iterator csi;
 
 
  dummy.node = node;
  dummy.node = node;
  slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
  slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
  if (slot == NULL)
  if (slot == NULL)
    csi.index = (unsigned) ~0;
    csi.index = (unsigned) ~0;
  else
  else
    {
    {
      element = (cgraph_node_set_element) *slot;
      element = (cgraph_node_set_element) *slot;
      gcc_assert (VEC_index (cgraph_node_ptr, set->nodes, element->index)
      gcc_assert (VEC_index (cgraph_node_ptr, set->nodes, element->index)
                  == node);
                  == node);
      csi.index = element->index;
      csi.index = element->index;
    }
    }
  csi.set = set;
  csi.set = set;
 
 
  return csi;
  return csi;
}
}
 
 
/* Dump content of SET to file F.  */
/* Dump content of SET to file F.  */
 
 
void
void
dump_cgraph_node_set (FILE *f, cgraph_node_set set)
dump_cgraph_node_set (FILE *f, cgraph_node_set set)
{
{
  cgraph_node_set_iterator iter;
  cgraph_node_set_iterator iter;
 
 
  for (iter = csi_start (set); !csi_end_p (iter); csi_next (&iter))
  for (iter = csi_start (set); !csi_end_p (iter); csi_next (&iter))
    {
    {
      struct cgraph_node *node = csi_node (iter);
      struct cgraph_node *node = csi_node (iter);
      dump_cgraph_node (f, node);
      dump_cgraph_node (f, node);
    }
    }
}
}
 
 
/* Dump content of SET to stderr.  */
/* Dump content of SET to stderr.  */
 
 
void
void
debug_cgraph_node_set (cgraph_node_set set)
debug_cgraph_node_set (cgraph_node_set set)
{
{
  dump_cgraph_node_set (stderr, set);
  dump_cgraph_node_set (stderr, set);
}
}
 
 
 
 

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