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/* Map logical line numbers to (source file, line number) pairs.

   Copyright (C) 2001, 2003, 2004, 2007, 2008, 2009

   Free Software Foundation, Inc.

This program 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.

This program 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 this program; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.

 In other words, you are welcome to use, share and improve this program.

 You are forbidden to forbid anyone else to use, share and improve

 what you give them.   Help stamp out software-hoarding!  */

#include "config.h"

#include "system.h"

#include "line-map.h"

static void trace_include (const struct line_maps *, const struct line_map *);

/* Initialize a line map set.  */

void

linemap_init (struct line_maps *set)

{

  set->maps = NULL;

  set->allocated = 0;

  set->used = 0;

  set->last_listed = -1;

  set->trace_includes = false;

  set->depth = 0;

  set->cache = 0;

  set->highest_location = RESERVED_LOCATION_COUNT - 1;

  set->highest_line = RESERVED_LOCATION_COUNT - 1;

  set->max_column_hint = 0;

  set->reallocator = 0;

}

/* Check for and warn about line_maps entered but not exited.  */

void

linemap_check_files_exited (struct line_maps *set)

{

  struct line_map *map;

  /* Depending upon whether we are handling preprocessed input or

     not, this can be a user error or an ICE.  */

  for (map = &set->maps[set->used - 1]; ! MAIN_FILE_P (map);

       map = INCLUDED_FROM (set, map))

    fprintf (stderr, "line-map.c: file \"%s\" entered but not left\n",

             map->to_file);

}

/* Free a line map set.  */

void

linemap_free (struct line_maps *set)

{

  if (set->maps)

    {

      linemap_check_files_exited (set);

      free (set->maps);

    }

}

/* Add a mapping of logical source line to physical source file and

   line number.

   The text pointed to by TO_FILE must have a lifetime

   at least as long as the final call to lookup_line ().  An empty

   TO_FILE means standard input.  If reason is LC_LEAVE, and

   TO_FILE is NULL, then TO_FILE, TO_LINE and SYSP are given their

   natural values considering the file we are returning to.

   FROM_LINE should be monotonic increasing across calls to this

   function.  A call to this function can relocate the previous set of

   maps, so any stored line_map pointers should not be used.  */

const struct line_map *

linemap_add (struct line_maps *set, enum lc_reason reason,

             unsigned int sysp, const char *to_file, linenum_type to_line)

{

  struct line_map *map;

  source_location start_location = set->highest_location + 1;

  if (set->used && start_location < set->maps[set->used - 1].start_location)

    abort ();

  if (set->used == set->allocated)

    {

      line_map_realloc reallocator

        = set->reallocator ? set->reallocator : xrealloc;

      set->allocated = 2 * set->allocated + 256;

      set->maps

        = (struct line_map *) (*reallocator) (set->maps,

                                              set->allocated

                                              * sizeof (struct line_map));

      memset (&set->maps[set->used], 0, ((set->allocated - set->used)

                                         * sizeof (struct line_map)));

    }

  map = &set->maps[set->used];

  if (to_file && *to_file == '\0' && reason != LC_RENAME_VERBATIM)

    to_file = "<stdin>";

  if (reason == LC_RENAME_VERBATIM)

    reason = LC_RENAME;

  /* If we don't keep our line maps consistent, we can easily

     segfault.  Don't rely on the client to do it for us.  */

  if (set->depth == 0)

    reason = LC_ENTER;

  else if (reason == LC_LEAVE)

    {

      struct line_map *from;

      bool error;

      if (MAIN_FILE_P (map - 1))

        {

          if (to_file == NULL)

            {

              set->depth--;

              return NULL;

            }

          error = true;

          reason = LC_RENAME;

          from = map - 1;

        }

      else

        {

          from = INCLUDED_FROM (set, map - 1);

          error = to_file && strcmp (from->to_file, to_file);

        }

      /* Depending upon whether we are handling preprocessed input or

         not, this can be a user error or an ICE.  */

      if (error)

        fprintf (stderr, "line-map.c: file \"%s\" left but not entered\n",

                 to_file);

      /* A TO_FILE of NULL is special - we use the natural values.  */

      if (error || to_file == NULL)

        {

          to_file = from->to_file;

          to_line = SOURCE_LINE (from, from[1].start_location);

          sysp = from->sysp;

        }

    }

  map->reason = reason;

  map->sysp = sysp;

  map->start_location = start_location;

  map->to_file = to_file;

  map->to_line = to_line;

  set->cache = set->used++;

  map->column_bits = 0;

  set->highest_location = start_location;

  set->highest_line = start_location;

  set->max_column_hint = 0;

  if (reason == LC_ENTER)

    {

      map->included_from = set->depth == 0 ? -1 : (int) (set->used - 2);

      set->depth++;

      if (set->trace_includes)

        trace_include (set, map);

    }

  else if (reason == LC_RENAME)

    map->included_from = map[-1].included_from;

  else if (reason == LC_LEAVE)

    {

      set->depth--;

      map->included_from = INCLUDED_FROM (set, map - 1)->included_from;

    }

  return map;

}

source_location

linemap_line_start (struct line_maps *set, linenum_type to_line,

                    unsigned int max_column_hint)

{

  struct line_map *map = &set->maps[set->used - 1];

  source_location highest = set->highest_location;

  source_location r;

  linenum_type last_line = SOURCE_LINE (map, set->highest_line);

  int line_delta = to_line - last_line;

  bool add_map = false;

  if (line_delta < 0

      || (line_delta > 10 && line_delta * map->column_bits > 1000)

      || (max_column_hint >= (1U << map->column_bits))

      || (max_column_hint <= 80 && map->column_bits >= 10))

    {

      add_map = true;

    }

  else

    max_column_hint = set->max_column_hint;

  if (add_map)

    {

      int column_bits;

      if (max_column_hint > 100000 || highest > 0xC0000000)

        {

          /* If the column number is ridiculous or we've allocated a huge

             number of source_locations, give up on column numbers. */

          max_column_hint = 0;

          if (highest >0xF0000000)

            return 0;

          column_bits = 0;

        }

      else

        {

          column_bits = 7;

          while (max_column_hint >= (1U << column_bits))

            column_bits++;

          max_column_hint = 1U << column_bits;

        }

      /* Allocate the new line_map.  However, if the current map only has a

         single line we can sometimes just increase its column_bits instead. */

      if (line_delta < 0

          || last_line != map->to_line

          || SOURCE_COLUMN (map, highest) >= (1U << column_bits))

        map = (struct line_map *) linemap_add (set, LC_RENAME, map->sysp,

                                               map->to_file, to_line);

      map->column_bits = column_bits;

      r = map->start_location + ((to_line - map->to_line) << column_bits);

    }

  else

    r = highest - SOURCE_COLUMN (map, highest)

      + (line_delta << map->column_bits);

  set->highest_line = r;

  if (r > set->highest_location)

    set->highest_location = r;

  set->max_column_hint = max_column_hint;

  return r;

}

source_location

linemap_position_for_column (struct line_maps *set, unsigned int to_column)

{

  source_location r = set->highest_line;

  if (to_column >= set->max_column_hint)

    {

      if (r >= 0xC000000 || to_column > 100000)

        {

          /* Running low on source_locations - disable column numbers.  */

          return r;

        }

      else

        {

          struct line_map *map = &set->maps[set->used - 1];

          r = linemap_line_start (set, SOURCE_LINE (map, r), to_column + 50);

        }

    }

  r = r + to_column;

  if (r >= set->highest_location)

    set->highest_location = r;

  return r;

}

/* Given a logical line, returns the map from which the corresponding

   (source file, line) pair can be deduced.  Since the set is built

   chronologically, the logical lines are monotonic increasing, and so

   the list is sorted and we can use a binary search.  */

const struct line_map *

linemap_lookup (struct line_maps *set, source_location line)

{

  unsigned int md, mn, mx;

  const struct line_map *cached;

  mn = set->cache;

  mx = set->used;

  cached = &set->maps[mn];

  /* We should get a segfault if no line_maps have been added yet.  */

  if (line >= cached->start_location)

    {

      if (mn + 1 == mx || line < cached[1].start_location)

        return cached;

    }

  else

    {

      mx = mn;

      mn = 0;

    }

  while (mx - mn > 1)

    {

      md = (mn + mx) / 2;

      if (set->maps[md].start_location > line)

        mx = md;

      else

        mn = md;

    }

  set->cache = mn;

  return &set->maps[mn];

}

/* Print an include trace, for e.g. the -H option of the preprocessor.  */

static void

trace_include (const struct line_maps *set, const struct line_map *map)

{

  unsigned int i = set->depth;

  while (--i)

    putc ('.', stderr);

  fprintf (stderr, " %s\n", map->to_file);

}