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/* gen-protos.c - massages a list of prototypes, for use by fixproto.

   Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2003, 2004, 2005, 2007

   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/>.  */

#include "bconfig.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "scan.h"

#include "errors.h"

int verbose = 0;

static void add_hash (const char *);

static int parse_fn_proto (char *, char *, struct fn_decl *);

#define HASH_SIZE 2503 /* a prime */

int hash_tab[HASH_SIZE];

int next_index;

int collisions;

static void

add_hash (const char *fname)

{

  int i, i0;

  /* NOTE:  If you edit this, also edit lookup_std_proto in fix-header.c !! */

  i = hashstr (fname, strlen (fname)) % HASH_SIZE;

  i0 = i;

  if (hash_tab[i] != 0)

    {

      collisions++;

      for (;;)

        {

          i = (i+1) % HASH_SIZE;

          gcc_assert (i != i0);

          if (hash_tab[i] == 0)

            break;

        }

    }

  hash_tab[i] = next_index;

  next_index++;

}

/* Given a function prototype, fill in the fields of FN.

   The result is a boolean indicating if a function prototype was found.

   The input string is modified (trailing NULs are inserted).

   The fields of FN point to the input string.  */

static int

parse_fn_proto (char *start, char *end, struct fn_decl *fn)

{

  char *ptr;

  int param_nesting = 1;

  char *param_start, *param_end, *decl_start, *name_start, *name_end;

  ptr = end - 1;

  while (*ptr == ' ' || *ptr == '\t') ptr--;

  if (*ptr-- != ';')

    {

      fprintf (stderr, "Funny input line: %s\n", start);

      return 0;

    }

  while (*ptr == ' ' || *ptr == '\t') ptr--;

  if (*ptr != ')')

    {

      fprintf (stderr, "Funny input line: %s\n", start);

      return 0;

    }

  param_end = ptr;

  for (;;)

    {

      int c = *--ptr;

      if (c == '(' && --param_nesting == 0)

        break;

      else if (c == ')')

        param_nesting++;

    }

  param_start = ptr+1;

  ptr--;

  while (*ptr == ' ' || *ptr == '\t') ptr--;

  if (!ISALNUM ((unsigned char)*ptr))

    {

      if (verbose)

        fprintf (stderr, "%s: Can't handle this complex prototype: %s\n",

                 progname, start);

      return 0;

    }

  name_end = ptr+1;

  while (ISIDNUM (*ptr))

    --ptr;

  name_start = ptr+1;

  while (*ptr == ' ' || *ptr == '\t') ptr--;

  ptr[1] = 0;

  *param_end = 0;

  *name_end = 0;

  decl_start = start;

  if (strncmp (decl_start, "typedef ", 8) == 0)

    return 0;

  if (strncmp (decl_start, "extern ", 7) == 0)

    decl_start += 7;

  fn->fname = name_start;

  fn->rtype = decl_start;

  fn->params = param_start;

  return 1;

}

int

main (int argc ATTRIBUTE_UNUSED, char **argv)

{

  FILE *inf = stdin;

  FILE *outf = stdout;

  int i;

  sstring linebuf;

  struct fn_decl fn_decl;

  i = strlen (argv[0]);

  while (i > 0 && argv[0][i-1] != '/') --i;

  progname = &argv[0][i];

  /* Unlock the stdio streams.  */

  unlock_std_streams ();

  INIT_SSTRING (&linebuf);

  fprintf (outf, "struct fn_decl std_protos[] = {\n");

  /* A hash table entry of 0 means "unused" so reserve it.  */

  fprintf (outf, "  {\"\", \"\", \"\", 0},\n");

  next_index = 1;

  for (;;)

    {

      int c = skip_spaces (inf, ' ');

      if (c == EOF)

        break;

      linebuf.ptr = linebuf.base;

      ungetc (c, inf);

      c = read_upto (inf, &linebuf, '\n');

      if (linebuf.base[0] == '#') /* skip cpp command */

        continue;

      if (linebuf.base[0] == '\0') /* skip empty line */

        continue;

      if (! parse_fn_proto (linebuf.base, linebuf.ptr, &fn_decl))

        continue;

      add_hash (fn_decl.fname);

      fprintf (outf, "  {\"%s\", \"%s\", \"%s\", 0},\n",

               fn_decl.fname, fn_decl.rtype, fn_decl.params);

      if (c == EOF)

        break;

    }

  fprintf (outf, "  {0, 0, 0, 0}\n};\n");

  fprintf (outf, "#define HASH_SIZE %d\n", HASH_SIZE);

  fprintf (outf, "short hash_tab[HASH_SIZE] = {\n");

  for (i = 0; i < HASH_SIZE; i++)

    fprintf (outf, "  %d,\n", hash_tab[i]);

  fprintf (outf, "};\n");

  fprintf (stderr, "gen-protos: %d entries %d collisions\n",

           next_index, collisions);

  return 0;

}