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/* Top level of GCC compilers (cc1, cc1plus, etc.)

   Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,

   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

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/>.  */

/* This is the top level of cc1/c++.

   It parses command args, opens files, invokes the various passes

   in the proper order, and counts the time used by each.

   Error messages and low-level interface to malloc also handled here.  */

#include "config.h"

#undef FLOAT /* This is for hpux. They should change hpux.  */

#undef FFS  /* Some systems define this in param.h.  */

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include <signal.h>

#ifdef HAVE_SYS_RESOURCE_H

# include <sys/resource.h>

#endif

#ifdef HAVE_SYS_TIMES_H

# include <sys/times.h>

#endif

#include "line-map.h"

#include "input.h"

#include "tree.h"

#include "rtl.h"

#include "tm_p.h"

#include "flags.h"

#include "insn-attr.h"

#include "insn-config.h"

#include "insn-flags.h"

#include "hard-reg-set.h"

#include "recog.h"

#include "output.h"

#include "except.h"

#include "function.h"

#include "toplev.h"

#include "expr.h"

#include "basic-block.h"

#include "intl.h"

#include "ggc.h"

#include "graph.h"

#include "regs.h"

#include "timevar.h"

#include "diagnostic.h"

#include "params.h"

#include "reload.h"

#include "dwarf2asm.h"

#include "integrate.h"

#include "real.h"

#include "debug.h"

#include "target.h"

#include "langhooks.h"

#include "cfglayout.h"

#include "cfgloop.h"

#include "hosthooks.h"

#include "cgraph.h"

#include "opts.h"

#include "coverage.h"

#include "value-prof.h"

#include "tree-inline.h"

#include "tree-flow.h"

#include "tree-pass.h"

#include "tree-dump.h"

#include "df.h"

#include "predict.h"

#include "lto-streamer.h"

#include "plugin.h"

#if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)

#include "dwarf2out.h"

#endif

#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)

#include "dbxout.h"

#endif

#ifdef SDB_DEBUGGING_INFO

#include "sdbout.h"

#endif

#ifdef XCOFF_DEBUGGING_INFO

#include "xcoffout.h"           /* Needed for external data

                                   declarations for e.g. AIX 4.x.  */

#endif

/* This is used for debugging.  It allows the current pass to printed

   from anywhere in compilation.

   The variable current_pass is also used for statistics and plugins.  */

struct opt_pass *current_pass;

/* Call from anywhere to find out what pass this is.  Useful for

   printing out debugging information deep inside an service

   routine.  */

void

print_current_pass (FILE *file)

{

  if (current_pass)

    fprintf (file, "current pass = %s (%d)\n",

             current_pass->name, current_pass->static_pass_number);

  else

    fprintf (file, "no current pass.\n");

}

/* Call from the debugger to get the current pass name.  */

void

debug_pass (void)

{

  print_current_pass (stderr);

}

/* Global variables used to communicate with passes.  */

int dump_flags;

bool in_gimple_form;

bool first_pass_instance;

/* This is called from various places for FUNCTION_DECL, VAR_DECL,

   and TYPE_DECL nodes.

   This does nothing for local (non-static) variables, unless the

   variable is a register variable with DECL_ASSEMBLER_NAME set.  In

   that case, or if the variable is not an automatic, it sets up the

   RTL and outputs any assembler code (label definition, storage

   allocation and initialization).

   DECL is the declaration.  TOP_LEVEL is nonzero

   if this declaration is not within a function.  */

void

rest_of_decl_compilation (tree decl,

                          int top_level,

                          int at_end)

{

  /* We deferred calling assemble_alias so that we could collect

     other attributes such as visibility.  Emit the alias now.  */

  {

    tree alias;

    alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));

    if (alias)

      {

        alias = TREE_VALUE (TREE_VALUE (alias));

        alias = get_identifier (TREE_STRING_POINTER (alias));

        assemble_alias (decl, alias);

      }

  }

  /* Can't defer this, because it needs to happen before any

     later function definitions are processed.  */

  if (DECL_ASSEMBLER_NAME_SET_P (decl) && DECL_REGISTER (decl))

    make_decl_rtl (decl);

  /* Forward declarations for nested functions are not "external",

     but we need to treat them as if they were.  */

  if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)

      || TREE_CODE (decl) == FUNCTION_DECL)

    {

      timevar_push (TV_VARCONST);

      /* Don't output anything when a tentative file-scope definition

         is seen.  But at end of compilation, do output code for them.

         We do output all variables and rely on

         callgraph code to defer them except for forward declarations

         (see gcc.c-torture/compile/920624-1.c) */

      if ((at_end

           || !DECL_DEFER_OUTPUT (decl)

           || DECL_INITIAL (decl))

          && !DECL_EXTERNAL (decl))

        {

          if (TREE_CODE (decl) != FUNCTION_DECL)

            varpool_finalize_decl (decl);

          else

            assemble_variable (decl, top_level, at_end, 0);

        }

#ifdef ASM_FINISH_DECLARE_OBJECT

      if (decl == last_assemble_variable_decl)

        {

          ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,

                                     top_level, at_end);

        }

#endif

      timevar_pop (TV_VARCONST);

    }

  else if (TREE_CODE (decl) == TYPE_DECL

           /* Like in rest_of_type_compilation, avoid confusing the debug

              information machinery when there are errors.  */

           && !(sorrycount || errorcount))

    {

      timevar_push (TV_SYMOUT);

      debug_hooks->type_decl (decl, !top_level);

      timevar_pop (TV_SYMOUT);

    }

  /* Let cgraph know about the existence of variables.  */

  if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl))

    varpool_node (decl);

}

/* Called after finishing a record, union or enumeral type.  */

void

rest_of_type_compilation (tree type, int toplev)

{

  /* Avoid confusing the debug information machinery when there are

     errors.  */

  if (errorcount != 0 || sorrycount != 0)

    return;

  timevar_push (TV_SYMOUT);

  debug_hooks->type_decl (TYPE_STUB_DECL (type), !toplev);

  timevar_pop (TV_SYMOUT);

}

void

finish_optimization_passes (void)

{

  int i;

  struct dump_file_info *dfi;

  char *name;

  timevar_push (TV_DUMP);

  if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)

    {

      dump_file = dump_begin (pass_profile.pass.static_pass_number, NULL);

      end_branch_prob ();

      if (dump_file)

        dump_end (pass_profile.pass.static_pass_number, dump_file);

    }

  if (optimize > 0)

    {

      dump_file = dump_begin (pass_combine.pass.static_pass_number, NULL);

      if (dump_file)

        {

          dump_combine_total_stats (dump_file);

          dump_end (pass_combine.pass.static_pass_number, dump_file);

        }

    }

  /* Do whatever is necessary to finish printing the graphs.  */

  if (graph_dump_format != no_graph)

    for (i = TDI_end; (dfi = get_dump_file_info (i)) != NULL; ++i)

      if (dump_initialized_p (i)

          && (dfi->flags & TDF_GRAPH) != 0

          && (name = get_dump_file_name (i)) != NULL)

        {

          finish_graph_dump_file (name);

          free (name);

        }

  timevar_pop (TV_DUMP);

}

static bool

gate_rest_of_compilation (void)

{

  /* Early return if there were errors.  We can run afoul of our

     consistency checks, and there's not really much point in fixing them.  */

  return !(rtl_dump_and_exit || flag_syntax_only || errorcount || sorrycount);

}

struct gimple_opt_pass pass_rest_of_compilation =

{

 {

  GIMPLE_PASS,

  "*rest_of_compilation",               /* name */

  gate_rest_of_compilation,             /* gate */

  NULL,                                 /* execute */

  NULL,                                 /* sub */

  NULL,                                 /* next */

  0,                                    /* static_pass_number */

  TV_REST_OF_COMPILATION,               /* tv_id */

  PROP_rtl,                             /* properties_required */

  0,                                    /* properties_provided */

  0,                                    /* properties_destroyed */

  0,                                    /* todo_flags_start */

  TODO_ggc_collect                      /* todo_flags_finish */

 }

};

static bool

gate_postreload (void)

{

  return reload_completed;

}

struct rtl_opt_pass pass_postreload =

{

 {

  RTL_PASS,

  "*all-postreload",                        /* name */

  gate_postreload,                      /* gate */

  NULL,                                 /* execute */

  NULL,                                 /* sub */

  NULL,                                 /* next */

  0,                                    /* static_pass_number */

  TV_NONE,                              /* tv_id */

  PROP_rtl,                             /* properties_required */

  0,                                    /* properties_provided */

  0,                                    /* properties_destroyed */

  0,                                    /* todo_flags_start */

  TODO_ggc_collect | TODO_verify_rtl_sharing /* todo_flags_finish */

 }

};

/* The root of the compilation pass tree, once constructed.  */

struct opt_pass *all_passes, *all_small_ipa_passes, *all_lowering_passes,

  *all_regular_ipa_passes, *all_lto_gen_passes;

/* This is used by plugins, and should also be used in register_pass.  */

#define DEF_PASS_LIST(LIST) &LIST,

struct opt_pass **gcc_pass_lists[] = { GCC_PASS_LISTS NULL };

#undef DEF_PASS_LIST

/* A map from static pass id to optimization pass.  */

struct opt_pass **passes_by_id;

int passes_by_id_size;

/* Set the static pass number of pass PASS to ID and record that

   in the mapping from static pass number to pass.  */

static void

set_pass_for_id (int id, struct opt_pass *pass)

{

  pass->static_pass_number = id;

  if (passes_by_id_size <= id)

    {

      passes_by_id = XRESIZEVEC (struct opt_pass *, passes_by_id, id + 1);

      memset (passes_by_id + passes_by_id_size, 0,

              (id + 1 - passes_by_id_size) * sizeof (void *));

      passes_by_id_size = id + 1;

    }

  passes_by_id[id] = pass;

}

/* Return the pass with the static pass number ID.  */

struct opt_pass *

get_pass_for_id (int id)

{

  if (id >= passes_by_id_size)

    return NULL;

  return passes_by_id[id];

}

/* Iterate over the pass tree allocating dump file numbers.  We want

   to do this depth first, and independent of whether the pass is

   enabled or not.  */

void

register_one_dump_file (struct opt_pass *pass)

{

  char *dot_name, *flag_name, *glob_name;

  const char *name, *prefix;

  char num[10];

  int flags, id;

  /* See below in next_pass_1.  */

  num[0] = '\0';

  if (pass->static_pass_number != -1)

    sprintf (num, "%d", ((int) pass->static_pass_number < 0

                         ? 1 : pass->static_pass_number));

  /* The name is both used to identify the pass for the purposes of plugins,

     and to specify dump file name and option.

     The latter two might want something short which is not quite unique; for

     that reason, we may have a disambiguating prefix, followed by a space

     to mark the start of the following dump file name / option string.  */

  name = strchr (pass->name, ' ');

  name = name ? name + 1 : pass->name;

  dot_name = concat (".", name, num, NULL);

  if (pass->type == SIMPLE_IPA_PASS || pass->type == IPA_PASS)

    prefix = "ipa-", flags = TDF_IPA;

  else if (pass->type == GIMPLE_PASS)

    prefix = "tree-", flags = TDF_TREE;

  else

    prefix = "rtl-", flags = TDF_RTL;

  flag_name = concat (prefix, name, num, NULL);

  glob_name = concat (prefix, name, NULL);

  id = dump_register (dot_name, flag_name, glob_name, flags);

  set_pass_for_id (id, pass);

}

/* Recursive worker function for register_dump_files.  */

static int

register_dump_files_1 (struct opt_pass *pass, int properties)

{

  do

    {

      int new_properties = (properties | pass->properties_provided)

                           & ~pass->properties_destroyed;

      if (pass->name && pass->name[0] != '*')

        register_one_dump_file (pass);

      if (pass->sub)

        new_properties = register_dump_files_1 (pass->sub, new_properties);

      /* If we have a gate, combine the properties that we could have with

         and without the pass being examined.  */

      if (pass->gate)

        properties &= new_properties;

      else

        properties = new_properties;

      pass = pass->next;

    }

  while (pass);

  return properties;

}

/* Register the dump files for the pipeline starting at PASS.

   PROPERTIES reflects the properties that are guaranteed to be available at

   the beginning of the pipeline.  */

static void

register_dump_files (struct opt_pass *pass,int properties)

{

  pass->properties_required |= properties;

  register_dump_files_1 (pass, properties);

}

/* Look at the static_pass_number and duplicate the pass

   if it is already added to a list. */

static struct opt_pass *

make_pass_instance (struct opt_pass *pass, bool track_duplicates)

{

  /* A nonzero static_pass_number indicates that the

     pass is already in the list.  */

  if (pass->static_pass_number)

    {

      struct opt_pass *new_pass;

      if (pass->type == GIMPLE_PASS

          || pass->type == RTL_PASS

          || pass->type == SIMPLE_IPA_PASS)

        {

          new_pass = XNEW (struct opt_pass);

          memcpy (new_pass, pass, sizeof (struct opt_pass));

        }

      else if (pass->type == IPA_PASS)

        {

          new_pass = (struct opt_pass *)XNEW (struct ipa_opt_pass_d);

          memcpy (new_pass, pass, sizeof (struct ipa_opt_pass_d));

        }

      else

        gcc_unreachable ();

      new_pass->next = NULL;

      new_pass->todo_flags_start &= ~TODO_mark_first_instance;

      /* Indicate to register_dump_files that this pass has duplicates,

         and so it should rename the dump file.  The first instance will

         be -1, and be number of duplicates = -static_pass_number - 1.

         Subsequent instances will be > 0 and just the duplicate number.  */

      if ((pass->name && pass->name[0] != '*') || track_duplicates)

        {

          pass->static_pass_number -= 1;

          new_pass->static_pass_number = -pass->static_pass_number;

        }

      return new_pass;

    }

  else

    {

      pass->todo_flags_start |= TODO_mark_first_instance;

      pass->static_pass_number = -1;

      invoke_plugin_callbacks (PLUGIN_NEW_PASS, pass);

    }

  return pass;

}

/* Add a pass to the pass list. Duplicate the pass if it's already

   in the list.  */

static struct opt_pass **

next_pass_1 (struct opt_pass **list, struct opt_pass *pass)

{

  /* Every pass should have a name so that plugins can refer to them.  */

  gcc_assert (pass->name != NULL);

  *list = make_pass_instance (pass, false);

  return &(*list)->next;

}

/* List node for an inserted pass instance. We need to keep track of all

   the newly-added pass instances (with 'added_pass_nodes' defined below)

   so that we can register their dump files after pass-positioning is finished.

   Registering dumping files needs to be post-processed or the

   static_pass_number of the opt_pass object would be modified and mess up

   the dump file names of future pass instances to be added.  */

struct pass_list_node

{

  struct opt_pass *pass;

  struct pass_list_node *next;

};

static struct pass_list_node *added_pass_nodes = NULL;

static struct pass_list_node *prev_added_pass_node;

/* Insert the pass at the proper position. Return true if the pass

   is successfully added.

   NEW_PASS_INFO - new pass to be inserted

   PASS_LIST - root of the pass list to insert the new pass to  */

static bool

position_pass (struct register_pass_info *new_pass_info,

               struct opt_pass **pass_list)

{

  struct opt_pass *pass = *pass_list, *prev_pass = NULL;

  bool success = false;

  for ( ; pass; prev_pass = pass, pass = pass->next)

    {

      /* Check if the current pass is of the same type as the new pass and

         matches the name and the instance number of the reference pass.  */

      if (pass->type == new_pass_info->pass->type

          && pass->name

          && !strcmp (pass->name, new_pass_info->reference_pass_name)

          && ((new_pass_info->ref_pass_instance_number == 0)

              || (new_pass_info->ref_pass_instance_number ==

                  pass->static_pass_number)

              || (new_pass_info->ref_pass_instance_number == 1

                  && pass->todo_flags_start & TODO_mark_first_instance)))

        {

          struct opt_pass *new_pass;

          struct pass_list_node *new_pass_node;

          new_pass = make_pass_instance (new_pass_info->pass, true);

          /* Insert the new pass instance based on the positioning op.  */

          switch (new_pass_info->pos_op)

            {

              case PASS_POS_INSERT_AFTER:

                new_pass->next = pass->next;

                pass->next = new_pass;

                /* Skip newly inserted pass to avoid repeated

                   insertions in the case where the new pass and the

                   existing one have the same name.  */

                pass = new_pass;

                break;

              case PASS_POS_INSERT_BEFORE:

                new_pass->next = pass;

                if (prev_pass)

                  prev_pass->next = new_pass;

                else

                  *pass_list = new_pass;

                break;

              case PASS_POS_REPLACE:

                new_pass->next = pass->next;

                if (prev_pass)

                  prev_pass->next = new_pass;

                else

                  *pass_list = new_pass;

                new_pass->sub = pass->sub;

                new_pass->tv_id = pass->tv_id;

                pass = new_pass;

                break;

              default:

                error ("Invalid pass positioning operation");

                return false;

            }

          /* Save the newly added pass (instance) in the added_pass_nodes

             list so that we can register its dump file later. Note that

             we cannot register the dump file now because doing so will modify

             the static_pass_number of the opt_pass object and therefore

             mess up the dump file name of future instances.  */

          new_pass_node = XCNEW (struct pass_list_node);

          new_pass_node->pass = new_pass;

          if (!added_pass_nodes)

            added_pass_nodes = new_pass_node;

          else

            prev_added_pass_node->next = new_pass_node;

          prev_added_pass_node = new_pass_node;

          success = true;

        }

      if (pass->sub && position_pass (new_pass_info, &pass->sub))

        success = true;

    }

  return success;

}

/* Hooks a new pass into the pass lists.

   PASS_INFO   - pass information that specifies the opt_pass object,

                 reference pass, instance number, and how to position

                 the pass  */

void

register_pass (struct register_pass_info *pass_info)

{

  bool all_instances, success;

  /* The checks below could fail in buggy plugins.  Existing GCC

     passes should never fail these checks, so we mention plugin in

     the messages.  */

  if (!pass_info->pass)

      fatal_error ("plugin cannot register a missing pass");

  if (!pass_info->pass->name)

      fatal_error ("plugin cannot register an unnamed pass");

  if (!pass_info->reference_pass_name)

      fatal_error

        ("plugin cannot register pass %qs without reference pass name",

         pass_info->pass->name);

  /* Try to insert the new pass to the pass lists.  We need to check

     all five lists as the reference pass could be in one (or all) of

     them.  */

  all_instances = pass_info->ref_pass_instance_number == 0;

  success = position_pass (pass_info, &all_lowering_passes);

  if (!success || all_instances)

    success |= position_pass (pass_info, &all_small_ipa_passes);

  if (!success || all_instances)

    success |= position_pass (pass_info, &all_regular_ipa_passes);

  if (!success || all_instances)

    success |= position_pass (pass_info, &all_lto_gen_passes);

  if (!success || all_instances)

    success |= position_pass (pass_info, &all_passes);

  if (!success)

    fatal_error

      ("pass %qs not found but is referenced by new pass %qs",

       pass_info->reference_pass_name, pass_info->pass->name);

  /* OK, we have successfully inserted the new pass. We need to register

     the dump files for the newly added pass and its duplicates (if any).

     Because the registration of plugin/backend passes happens after the

     command-line options are parsed, the options that specify single

     pass dumping (e.g. -fdump-tree-PASSNAME) cannot be used for new

     passes. Therefore we currently can only enable dumping of

     new passes when the 'dump-all' flags (e.g. -fdump-tree-all)

     are specified. While doing so, we also delete the pass_list_node

     objects created during pass positioning.  */

  while (added_pass_nodes)

    {

      struct pass_list_node *next_node = added_pass_nodes->next;

      enum tree_dump_index tdi;

      register_one_dump_file (added_pass_nodes->pass);

      if (added_pass_nodes->pass->type == SIMPLE_IPA_PASS

          || added_pass_nodes->pass->type == IPA_PASS)

        tdi = TDI_ipa_all;

      else if (added_pass_nodes->pass->type == GIMPLE_PASS)

        tdi = TDI_tree_all;

      else

        tdi = TDI_rtl_all;

      /* Check if dump-all flag is specified.  */

      if (get_dump_file_info (tdi)->state)

        get_dump_file_info (added_pass_nodes->pass->static_pass_number)

            ->state = get_dump_file_info (tdi)->state;

      XDELETE (added_pass_nodes);

      added_pass_nodes = next_node;

    }

}

/* Construct the pass tree.  The sequencing of passes is driven by

   the cgraph routines:

   cgraph_finalize_compilation_unit ()

       for each node N in the cgraph

           cgraph_analyze_function (N)

               cgraph_lower_function (N) -> all_lowering_passes

   If we are optimizing, cgraph_optimize is then invoked:

   cgraph_optimize ()

       ipa_passes ()                    -> all_small_ipa_passes

       cgraph_expand_all_functions ()

           for each node N in the cgraph

               cgraph_expand_function (N)

                  tree_rest_of_compilation (DECL (N))  -> all_passes

*/

void

init_optimization_passes (void)

{

  struct opt_pass **p;

#define NEXT_PASS(PASS)  (p = next_pass_1 (p, &((PASS).pass)))

 /* All passes needed to lower the function into shape optimizers can

    operate on.  These passes are always run first on the function, but

    backend might produce already lowered functions that are not processed

    by these passes.  */

  p = &all_lowering_passes;

  NEXT_PASS (pass_warn_unused_result);

  NEXT_PASS (pass_diagnose_omp_blocks);