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/* Set up combined include path chain for the preprocessor.

   Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,

   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007

   Free Software Foundation, Inc.

   Broken out of cppinit.c and cppfiles.c and rewritten Mar 2003.

   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 "config.h"

#include "system.h"

#include "coretypes.h"

#include "machmode.h"

#include "target.h"

#include "tm.h"

#include "cpplib.h"

#include "prefix.h"

#include "intl.h"

#include "c-incpath.h"

#include "cppdefault.h"

/* Windows does not natively support inodes, and neither does MSDOS.

   Cygwin's emulation can generate non-unique inodes, so don't use it.

   VMS has non-numeric inodes.  */

#ifdef VMS

# define INO_T_EQ(A, B) (!memcmp (&(A), &(B), sizeof (A)))

# define INO_T_COPY(DEST, SRC) memcpy(&(DEST), &(SRC), sizeof (SRC))

#else

# if (defined _WIN32 && !defined (_UWIN)) || defined __MSDOS__

#  define INO_T_EQ(A, B) 0

# else

#  define INO_T_EQ(A, B) ((A) == (B))

# endif

# define INO_T_COPY(DEST, SRC) (DEST) = (SRC)

#endif

static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };

static void add_env_var_paths (const char *, int);

static void add_standard_paths (const char *, const char *, const char *, int);

static void free_path (struct cpp_dir *, int);

static void merge_include_chains (cpp_reader *, int);

static struct cpp_dir *remove_duplicates (cpp_reader *, struct cpp_dir *,

                                           struct cpp_dir *,

                                           struct cpp_dir *, int);

/* Include chains heads and tails.  */

static struct cpp_dir *heads[4];

static struct cpp_dir *tails[4];

static bool quote_ignores_source_dir;

enum { REASON_QUIET = 0, REASON_NOENT, REASON_DUP, REASON_DUP_SYS };

/* Free an element of the include chain, possibly giving a reason.  */

static void

free_path (struct cpp_dir *path, int reason)

{

  switch (reason)

    {

    case REASON_DUP:

    case REASON_DUP_SYS:

      fprintf (stderr, _("ignoring duplicate directory \"%s\"\n"), path->name);

      if (reason == REASON_DUP_SYS)

        fprintf (stderr,

 _("  as it is a non-system directory that duplicates a system directory\n"));

      break;

    case REASON_NOENT:

      fprintf (stderr, _("ignoring nonexistent directory \"%s\"\n"),

               path->name);

      break;

    case REASON_QUIET:

    default:

      break;

    }

  free (path->name);

  free (path);

}

/* Read ENV_VAR for a PATH_SEPARATOR-separated list of file names; and

   append all the names to the search path CHAIN.  */

static void

add_env_var_paths (const char *env_var, int chain)

{

  char *p, *q, *path;

  GET_ENVIRONMENT (q, env_var);

  if (!q)

    return;

  for (p = q; *q; p = q + 1)

    {

      q = p;

      while (*q != 0 && *q != PATH_SEPARATOR)

        q++;

      if (p == q)

        path = xstrdup (".");

      else

        {

          path = XNEWVEC (char, q - p + 1);

          memcpy (path, p, q - p);

          path[q - p] = '\0';

        }

      add_path (path, chain, chain == SYSTEM, false);

    }

}

/* Append the standard include chain defined in cppdefault.c.  */

static void

add_standard_paths (const char *sysroot, const char *iprefix,

                    const char *imultilib, int cxx_stdinc)

{

  const struct default_include *p;

  size_t len;

  if (iprefix && (len = cpp_GCC_INCLUDE_DIR_len) != 0)

    {

      /* Look for directories that start with the standard prefix.

         "Translate" them, i.e. replace /usr/local/lib/gcc... with

         IPREFIX and search them first.  */

      for (p = cpp_include_defaults; p->fname; p++)

        {

          if (!p->cplusplus || cxx_stdinc)

            {

              /* Should we be translating sysrooted dirs too?  Assume

                 that iprefix and sysroot are mutually exclusive, for

                 now.  */

              if (sysroot && p->add_sysroot)

                continue;

              if (!strncmp (p->fname, cpp_GCC_INCLUDE_DIR, len))

                {

                  char *str = concat (iprefix, p->fname + len, NULL);

                  if (p->multilib && imultilib)

                    str = concat (str, dir_separator_str, imultilib, NULL);

                  add_path (str, SYSTEM, p->cxx_aware, false);

                }

            }

        }

    }

  for (p = cpp_include_defaults; p->fname; p++)

    {

      if (!p->cplusplus || cxx_stdinc)

        {

          char *str;

          /* Should this directory start with the sysroot?  */

          if (sysroot && p->add_sysroot)

            str = concat (sysroot, p->fname, NULL);

          else

            str = update_path (p->fname, p->component);

          if (p->multilib && imultilib)

            str = concat (str, dir_separator_str, imultilib, NULL);

          add_path (str, SYSTEM, p->cxx_aware, false);

        }

    }

}

/* For each duplicate path in chain HEAD, keep just the first one.

   Remove each path in chain HEAD that also exists in chain SYSTEM.

   Set the NEXT pointer of the last path in the resulting chain to

   JOIN, unless it duplicates JOIN in which case the last path is

   removed.  Return the head of the resulting chain.  Any of HEAD,

   JOIN and SYSTEM can be NULL.  */

static struct cpp_dir *

remove_duplicates (cpp_reader *pfile, struct cpp_dir *head,

                   struct cpp_dir *system, struct cpp_dir *join,

                   int verbose)

{

  struct cpp_dir **pcur, *tmp, *cur;

  struct stat st;

  for (pcur = &head; *pcur; )

    {

      int reason = REASON_QUIET;

      cur = *pcur;

      if (stat (cur->name, &st))

        {

          /* Dirs that don't exist are silently ignored, unless verbose.  */

          if (errno != ENOENT)

            cpp_errno (pfile, CPP_DL_ERROR, cur->name);

          else

            {

              /* If -Wmissing-include-dirs is given, warn.  */

              cpp_options *opts = cpp_get_options (pfile);

              if (opts->warn_missing_include_dirs && cur->user_supplied_p)

                cpp_errno (pfile, CPP_DL_WARNING, cur->name);

              reason = REASON_NOENT;

            }

        }

      else if (!S_ISDIR (st.st_mode))

        cpp_error_with_line (pfile, CPP_DL_ERROR, 0, 0,

                             "%s: not a directory", cur->name);

      else

        {

          INO_T_COPY (cur->ino, st.st_ino);

          cur->dev  = st.st_dev;

          /* Remove this one if it is in the system chain.  */

          reason = REASON_DUP_SYS;

          for (tmp = system; tmp; tmp = tmp->next)

           if (INO_T_EQ (tmp->ino, cur->ino) && tmp->dev == cur->dev

               && cur->construct == tmp->construct)

              break;

          if (!tmp)

            {

              /* Duplicate of something earlier in the same chain?  */

              reason = REASON_DUP;

              for (tmp = head; tmp != cur; tmp = tmp->next)

               if (INO_T_EQ (cur->ino, tmp->ino) && cur->dev == tmp->dev

                   && cur->construct == tmp->construct)

                  break;

              if (tmp == cur

                  /* Last in the chain and duplicate of JOIN?  */

                  && !(cur->next == NULL && join

                       && INO_T_EQ (cur->ino, join->ino)

                      && cur->dev == join->dev

                      && cur->construct == join->construct))

                {

                  /* Unique, so keep this directory.  */

                  pcur = &cur->next;

                  continue;

                }

            }

        }

      /* Remove this entry from the chain.  */

      *pcur = cur->next;

      free_path (cur, verbose ? reason: REASON_QUIET);

    }

  *pcur = join;

  return head;

}

/* Merge the four include chains together in the order quote, bracket,

   system, after.  Remove duplicate dirs (as determined by

   INO_T_EQ()).

   We can't just merge the lists and then uniquify them because then

   we may lose directories from the <> search path that should be

   there; consider -iquote foo -iquote bar -Ifoo -Iquux.  It is

   however safe to treat -iquote bar -iquote foo -Ifoo -Iquux as if

   written -iquote bar -Ifoo -Iquux.  */

static void

merge_include_chains (cpp_reader *pfile, int verbose)

{

  /* Join the SYSTEM and AFTER chains.  Remove duplicates in the

     resulting SYSTEM chain.  */

  if (heads[SYSTEM])

    tails[SYSTEM]->next = heads[AFTER];

  else

    heads[SYSTEM] = heads[AFTER];

  heads[SYSTEM] = remove_duplicates (pfile, heads[SYSTEM], 0, 0, verbose);

  /* Remove duplicates from BRACKET that are in itself or SYSTEM, and

     join it to SYSTEM.  */

  heads[BRACKET] = remove_duplicates (pfile, heads[BRACKET], heads[SYSTEM],

                                      heads[SYSTEM], verbose);

  /* Remove duplicates from QUOTE that are in itself or SYSTEM, and

     join it to BRACKET.  */

  heads[QUOTE] = remove_duplicates (pfile, heads[QUOTE], heads[SYSTEM],

                                    heads[BRACKET], verbose);

  /* If verbose, print the list of dirs to search.  */

  if (verbose)

    {

      struct cpp_dir *p;

      fprintf (stderr, _("#include \"...\" search starts here:\n"));

      for (p = heads[QUOTE];; p = p->next)

        {

          if (p == heads[BRACKET])

            fprintf (stderr, _("#include <...> search starts here:\n"));

          if (!p)

            break;

          fprintf (stderr, " %s\n", p->name);

        }

      fprintf (stderr, _("End of search list.\n"));

    }

}

/* Use given -I paths for #include "..." but not #include <...>, and

   don't search the directory of the present file for #include "...".

   (Note that -I. -I- is not the same as the default setup; -I. uses

   the compiler's working dir.)  */

void

split_quote_chain (void)

{

  heads[QUOTE] = heads[BRACKET];

  tails[QUOTE] = tails[BRACKET];

  heads[BRACKET] = NULL;

  tails[BRACKET] = NULL;

  /* This is NOT redundant.  */

  quote_ignores_source_dir = true;

}

/* Add P to the chain specified by CHAIN.  */

void

add_cpp_dir_path (cpp_dir *p, int chain)

{

  if (tails[chain])

    tails[chain]->next = p;

  else

    heads[chain] = p;

  tails[chain] = p;

}

/* Add PATH to the include chain CHAIN. PATH must be malloc-ed and

   NUL-terminated.  */

void

add_path (char *path, int chain, int cxx_aware, bool user_supplied_p)

{

  cpp_dir *p;

#if defined (HAVE_DOS_BASED_FILE_SYSTEM)

  /* Convert all backslashes to slashes.  The native CRT stat()

     function does not recognize a directory that ends in a backslash

     (unless it is a drive root dir, such "c:\").  Forward slashes,

     trailing or otherwise, cause no problems for stat().  */

  char* c;

  for (c = path; *c; c++)

    if (*c == '\\') *c = '/';

#endif

  p = XNEW (cpp_dir);

  p->next = NULL;

  p->name = path;

  if (chain == SYSTEM || chain == AFTER)

    p->sysp = 1 + !cxx_aware;

  else

    p->sysp = 0;

  p->construct = 0;

  p->user_supplied_p = user_supplied_p;

  add_cpp_dir_path (p, chain);

}

/* Exported function to handle include chain merging, duplicate

   removal, and registration with cpplib.  */

void

register_include_chains (cpp_reader *pfile, const char *sysroot,

                         const char *iprefix, const char *imultilib,

                         int stdinc, int cxx_stdinc, int verbose)

{

  static const char *const lang_env_vars[] =

    { "C_INCLUDE_PATH", "CPLUS_INCLUDE_PATH",

      "OBJC_INCLUDE_PATH", "OBJCPLUS_INCLUDE_PATH" };

  cpp_options *cpp_opts = cpp_get_options (pfile);

  size_t idx = (cpp_opts->objc ? 2: 0);

  if (cpp_opts->cplusplus)

    idx++;

  else

    cxx_stdinc = false;

  /* CPATH and language-dependent environment variables may add to the

     include chain.  */

  add_env_var_paths ("CPATH", BRACKET);

  add_env_var_paths (lang_env_vars[idx], SYSTEM);

  target_c_incpath.extra_pre_includes (sysroot, iprefix, stdinc);

  /* Finally chain on the standard directories.  */

  if (stdinc)

    add_standard_paths (sysroot, iprefix, imultilib, cxx_stdinc);

  target_c_incpath.extra_includes (sysroot, iprefix, stdinc);

  merge_include_chains (pfile, verbose);

  cpp_set_include_chains (pfile, heads[QUOTE], heads[BRACKET],

                          quote_ignores_source_dir);

}

#if !(defined TARGET_EXTRA_INCLUDES) || !(defined TARGET_EXTRA_PRE_INCLUDES)

static void hook_void_charptr_charptr_int (const char *sysroot ATTRIBUTE_UNUSED,

                                           const char *iprefix ATTRIBUTE_UNUSED,

                                           int stdinc ATTRIBUTE_UNUSED)

{

}

#endif

#ifndef TARGET_EXTRA_INCLUDES

#define TARGET_EXTRA_INCLUDES hook_void_charptr_charptr_int

#endif

#ifndef TARGET_EXTRA_PRE_INCLUDES

#define TARGET_EXTRA_PRE_INCLUDES hook_void_charptr_charptr_int

#endif

struct target_c_incpath_s target_c_incpath = { TARGET_EXTRA_PRE_INCLUDES, TARGET_EXTRA_INCLUDES };