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/* Darwin support needed only by C/C++ frontends.

   Copyright (C) 2001, 2003, 2004, 2005, 2007, 2008, 2010, 2011

   Free Software Foundation, Inc.

   Contributed by Apple Computer 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/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "cpplib.h"

#include "tree.h"

#include "incpath.h"

#include "c-family/c-common.h"

#include "c-family/c-pragma.h"

#include "c-family/c-format.h"

#include "diagnostic-core.h"

#include "flags.h"

#include "tm_p.h"

#include "cppdefault.h"

#include "prefix.h"

#include "c-family/c-target.h"

#include "c-family/c-target-def.h"

/* Pragmas.  */

#define BAD(gmsgid) do { warning (OPT_Wpragmas, gmsgid); return; } while (0)

#define BAD2(msgid, arg) do { warning (OPT_Wpragmas, msgid, arg); return; } while (0)

static bool using_frameworks = false;

static const char *find_subframework_header (cpp_reader *pfile, const char *header,

                                             cpp_dir **dirp);

typedef struct align_stack

{

  int alignment;

  struct align_stack * prev;

} align_stack;

static struct align_stack * field_align_stack = NULL;

/* Maintain a small stack of alignments.  This is similar to pragma

   pack's stack, but simpler.  */

static void

push_field_alignment (int bit_alignment)

{

  align_stack *entry = XNEW (align_stack);

  entry->alignment = maximum_field_alignment;

  entry->prev = field_align_stack;

  field_align_stack = entry;

  maximum_field_alignment = bit_alignment;

}

static void

pop_field_alignment (void)

{

  if (field_align_stack)

    {

      align_stack *entry = field_align_stack;

      maximum_field_alignment = entry->alignment;

      field_align_stack = entry->prev;

      free (entry);

    }

  else

    error ("too many #pragma options align=reset");

}

/* Handlers for Darwin-specific pragmas.  */

void

darwin_pragma_ignore (cpp_reader *pfile ATTRIBUTE_UNUSED)

{

  /* Do nothing.  */

}

/* #pragma options align={mac68k|power|reset} */

void

darwin_pragma_options (cpp_reader *pfile ATTRIBUTE_UNUSED)

{

  const char *arg;

  tree t, x;

  if (pragma_lex (&t) != CPP_NAME)

    BAD ("malformed '#pragma options', ignoring");

  arg = IDENTIFIER_POINTER (t);

  if (strcmp (arg, "align"))

    BAD ("malformed '#pragma options', ignoring");

  if (pragma_lex (&t) != CPP_EQ)

    BAD ("malformed '#pragma options', ignoring");

  if (pragma_lex (&t) != CPP_NAME)

    BAD ("malformed '#pragma options', ignoring");

  if (pragma_lex (&x) != CPP_EOF)

    warning (OPT_Wpragmas, "junk at end of '#pragma options'");

  arg = IDENTIFIER_POINTER (t);

  if (!strcmp (arg, "mac68k"))

    push_field_alignment (16);

  else if (!strcmp (arg, "power"))

    push_field_alignment (0);

  else if (!strcmp (arg, "reset"))

    pop_field_alignment ();

  else

    BAD ("malformed '#pragma options align={mac68k|power|reset}', ignoring");

}

/* #pragma unused ([var {, var}*]) */

void

darwin_pragma_unused (cpp_reader *pfile ATTRIBUTE_UNUSED)

{

  tree decl, x;

  int tok;

  if (pragma_lex (&x) != CPP_OPEN_PAREN)

    BAD ("missing '(' after '#pragma unused', ignoring");

  while (1)

    {

      tok = pragma_lex (&decl);

      if (tok == CPP_NAME && decl)

        {

          tree local = lookup_name (decl);

          if (local && (TREE_CODE (local) == PARM_DECL

                        || TREE_CODE (local) == VAR_DECL))

            {

              TREE_USED (local) = 1;

              DECL_READ_P (local) = 1;

            }

          tok = pragma_lex (&x);

          if (tok != CPP_COMMA)

            break;

        }

    }

  if (tok != CPP_CLOSE_PAREN)

    BAD ("missing ')' after '#pragma unused', ignoring");

  if (pragma_lex (&x) != CPP_EOF)

    BAD ("junk at end of '#pragma unused'");

}

/* Parse the ms_struct pragma.  */

void

darwin_pragma_ms_struct (cpp_reader *pfile ATTRIBUTE_UNUSED)

{

  const char *arg;

  tree t;

  if (pragma_lex (&t) != CPP_NAME)

    BAD ("malformed '#pragma ms_struct', ignoring");

  arg = IDENTIFIER_POINTER (t);

  if (!strcmp (arg, "on"))

    darwin_ms_struct = true;

  else if (!strcmp (arg, "off") || !strcmp (arg, "reset"))

    darwin_ms_struct = false;

  else

    BAD ("malformed '#pragma ms_struct {on|off|reset}', ignoring");

  if (pragma_lex (&t) != CPP_EOF)

    BAD ("junk at end of '#pragma ms_struct'");

}

static struct frameworks_in_use {

  size_t len;

  const char *name;

  cpp_dir* dir;

} *frameworks_in_use;

static int num_frameworks = 0;

static int max_frameworks = 0;

/* Remember which frameworks have been seen, so that we can ensure

   that all uses of that framework come from the same framework.  DIR

   is the place where the named framework NAME, which is of length

   LEN, was found.  We copy the directory name from NAME, as it will be

   freed by others.  */

static void

add_framework (const char *name, size_t len, cpp_dir *dir)

{

  char *dir_name;

  int i;

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

    {

      if (len == frameworks_in_use[i].len

          && strncmp (name, frameworks_in_use[i].name, len) == 0)

        {

          return;

        }

    }

  if (i >= max_frameworks)

    {

      max_frameworks = i*2;

      max_frameworks += i == 0;

      frameworks_in_use = XRESIZEVEC (struct frameworks_in_use,

                                      frameworks_in_use, max_frameworks);

    }

  dir_name = XNEWVEC (char, len + 1);

  memcpy (dir_name, name, len);

  dir_name[len] = '\0';

  frameworks_in_use[num_frameworks].name = dir_name;

  frameworks_in_use[num_frameworks].len = len;

  frameworks_in_use[num_frameworks].dir = dir;

  ++num_frameworks;

}

/* Recall if we have seen the named framework NAME, before, and where

   we saw it.  NAME is LEN bytes long.  The return value is the place

   where it was seen before.  */

static struct cpp_dir*

find_framework (const char *name, size_t len)

{

  int i;

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

    {

      if (len == frameworks_in_use[i].len

          && strncmp (name, frameworks_in_use[i].name, len) == 0)

        {

          return frameworks_in_use[i].dir;

        }

    }

  return 0;

}

/* There are two directories in a framework that contain header files,

   Headers and PrivateHeaders.  We search Headers first as it is more

   common to upgrade a header from PrivateHeaders to Headers and when

   that is done, the old one might hang around and be out of data,

   causing grief.  */

struct framework_header {const char * dirName; int dirNameLen; };

static struct framework_header framework_header_dirs[] = {

  { "Headers", 7 },

  { "PrivateHeaders", 14 },

  { NULL, 0 }

};

/* Returns a pointer to a malloced string that contains the real pathname

   to the file, given the base name and the name.  */

static char *

framework_construct_pathname (const char *fname, cpp_dir *dir)

{

  char *buf;

  size_t fname_len, frname_len;

  cpp_dir *fast_dir;

  char *frname;

  struct stat st;

  int i;

  /* Framework names must have a / in them.  */

  buf = strchr (fname, '/');

  if (buf)

    fname_len = buf - fname;

  else

    return 0;

  fast_dir = find_framework (fname, fname_len);

  /* Framework includes must all come from one framework.  */

  if (fast_dir && dir != fast_dir)

    return 0;

  frname = XNEWVEC (char, strlen (fname) + dir->len + 2

                    + strlen(".framework/") + strlen("PrivateHeaders"));

  strncpy (&frname[0], dir->name, dir->len);

  frname_len = dir->len;

  if (frname_len && frname[frname_len-1] != '/')

    frname[frname_len++] = '/';

  strncpy (&frname[frname_len], fname, fname_len);

  frname_len += fname_len;

  strncpy (&frname[frname_len], ".framework/", strlen (".framework/"));

  frname_len += strlen (".framework/");

  if (fast_dir == 0)

    {

      frname[frname_len-1] = 0;

      if (stat (frname, &st) == 0)

        {

          /* As soon as we find the first instance of the framework,

             we stop and never use any later instance of that

             framework.  */

          add_framework (fname, fname_len, dir);

        }

      else

        {

          /* If we can't find the parent directory, no point looking

             further.  */

          free (frname);

          return 0;

        }

      frname[frname_len-1] = '/';

    }

  /* Append framework_header_dirs and header file name */

  for (i = 0; framework_header_dirs[i].dirName; i++)

    {

      strncpy (&frname[frname_len],

               framework_header_dirs[i].dirName,

               framework_header_dirs[i].dirNameLen);

      strcpy (&frname[frname_len + framework_header_dirs[i].dirNameLen],

              &fname[fname_len]);

      if (stat (frname, &st) == 0)

        return frname;

    }

  free (frname);

  return 0;

}

/* Search for FNAME in sub-frameworks.  pname is the context that we

   wish to search in.  Return the path the file was found at,

   otherwise return 0.  */

static const char*

find_subframework_file (const char *fname, const char *pname)

{

  char *sfrname;

  const char *dot_framework = ".framework/";

  char *bufptr;

  int sfrname_len, i, fname_len;

  struct cpp_dir *fast_dir;

  static struct cpp_dir subframe_dir;

  struct stat st;

  bufptr = strchr (fname, '/');

  /* Subframework files must have / in the name.  */

  if (bufptr == 0)

    return 0;

  fname_len = bufptr - fname;

  fast_dir = find_framework (fname, fname_len);

  /* Sub framework header filename includes parent framework name and

     header name in the "CarbonCore/OSUtils.h" form. If it does not

     include slash it is not a sub framework include.  */

  bufptr = strstr (pname, dot_framework);

  /* If the parent header is not of any framework, then this header

     cannot be part of any subframework.  */

  if (!bufptr)

    return 0;

  /* Now translate. For example,                  +- bufptr

     fname = CarbonCore/OSUtils.h                 |

     pname = /System/Library/Frameworks/Foundation.framework/Headers/Foundation.h

     into

     sfrname = /System/Library/Frameworks/Foundation.framework/Frameworks/CarbonCore.framework/Headers/OSUtils.h */

  sfrname = XNEWVEC (char, strlen (pname) + strlen (fname) + 2 +

                              strlen ("Frameworks/") + strlen (".framework/")

                              + strlen ("PrivateHeaders"));

  bufptr += strlen (dot_framework);

  sfrname_len = bufptr - pname;

  strncpy (&sfrname[0], pname, sfrname_len);

  strncpy (&sfrname[sfrname_len], "Frameworks/", strlen ("Frameworks/"));

  sfrname_len += strlen("Frameworks/");

  strncpy (&sfrname[sfrname_len], fname, fname_len);

  sfrname_len += fname_len;

  strncpy (&sfrname[sfrname_len], ".framework/", strlen (".framework/"));

  sfrname_len += strlen (".framework/");

  /* Append framework_header_dirs and header file name */

  for (i = 0; framework_header_dirs[i].dirName; i++)

    {

      strncpy (&sfrname[sfrname_len],

               framework_header_dirs[i].dirName,

               framework_header_dirs[i].dirNameLen);

      strcpy (&sfrname[sfrname_len + framework_header_dirs[i].dirNameLen],

              &fname[fname_len]);

      if (stat (sfrname, &st) == 0)

        {

          if (fast_dir != &subframe_dir)

            {

              if (fast_dir)

                warning (0, "subframework include %s conflicts with framework include",

                         fname);

              else

                add_framework (fname, fname_len, &subframe_dir);

            }

          return sfrname;

        }

    }

  free (sfrname);

  return 0;

}

/* Add PATH to the system includes. PATH must be malloc-ed and

   NUL-terminated.  System framework paths are C++ aware.  */

static void

add_system_framework_path (char *path)

{

  int cxx_aware = 1;

  cpp_dir *p;

  p = XNEW (cpp_dir);

  p->next = NULL;

  p->name = path;

  p->sysp = 1 + !cxx_aware;

  p->construct = framework_construct_pathname;

  using_frameworks = 1;

  add_cpp_dir_path (p, SYSTEM);

}

/* Add PATH to the bracket includes. PATH must be malloc-ed and

   NUL-terminated.  */

void

add_framework_path (char *path)

{

  cpp_dir *p;

  p = XNEW (cpp_dir);

  p->next = NULL;

  p->name = path;

  p->sysp = 0;

  p->construct = framework_construct_pathname;

  using_frameworks = 1;

  add_cpp_dir_path (p, BRACKET);

}

static const char *framework_defaults [] =

  {

    "/System/Library/Frameworks",

    "/Library/Frameworks",

  };

/* Register the GNU objective-C runtime include path if STDINC.  */

void

darwin_register_objc_includes (const char *sysroot, const char *iprefix,

                               int stdinc)

{

  const char *fname;

  size_t len;

  /* We do not do anything if we do not want the standard includes. */

  if (!stdinc)

    return;

  fname = GCC_INCLUDE_DIR "-gnu-runtime";

  /* Register the GNU OBJC runtime include path if we are compiling  OBJC

    with GNU-runtime.  */

  if (c_dialect_objc () && !flag_next_runtime)

    {

      char *str;

      /* See if our directory starts with the standard prefix.

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

         IPREFIX and search them first.  */

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

          && !strncmp (fname, cpp_GCC_INCLUDE_DIR, len))

        {

          str = concat (iprefix, fname + len, NULL);

          /* FIXME: wrap the headers for C++awareness.  */

          add_path (str, SYSTEM, /*c++aware=*/false, false);

        }

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

      if (sysroot)

        str = concat (sysroot, fname, NULL);

      else

        str = update_path (fname, "");

      add_path (str, SYSTEM, /*c++aware=*/false, false);

    }

}

/* Register all the system framework paths if STDINC is true and setup

   the missing_header callback for subframework searching if any

   frameworks had been registered.  */

void

darwin_register_frameworks (const char *sysroot,

                            const char *iprefix ATTRIBUTE_UNUSED, int stdinc)

{

  if (stdinc)

    {

      size_t i;

      /* Setup default search path for frameworks.  */

      for (i=0; i<sizeof (framework_defaults)/sizeof(const char *); ++i)

        {

          char *str;

          if (sysroot)

            str = concat (sysroot, xstrdup (framework_defaults [i]), NULL);

          else

            str = xstrdup (framework_defaults[i]);

          /* System Framework headers are cxx aware.  */

          add_system_framework_path (str);

        }

    }

  if (using_frameworks)

    cpp_get_callbacks (parse_in)->missing_header = find_subframework_header;

}

/* Search for HEADER in context dependent way.  The return value is

   the malloced name of a header to try and open, if any, or NULL

   otherwise.  This is called after normal header lookup processing

   fails to find a header.  We search each file in the include stack,

   using FUNC, starting from the most deeply nested include and

   finishing with the main input file.  We stop searching when FUNC

   returns nonzero.  */

static const char*

find_subframework_header (cpp_reader *pfile, const char *header, cpp_dir **dirp)

{

  const char *fname = header;

  struct cpp_buffer *b;

  const char *n;

  for (b = cpp_get_buffer (pfile);

       b && cpp_get_file (b) && cpp_get_path (cpp_get_file (b));

       b = cpp_get_prev (b))

    {

      n = find_subframework_file (fname, cpp_get_path (cpp_get_file (b)));

      if (n)

        {

          /* Logically, the place where we found the subframework is

             the place where we found the Framework that contains the

             subframework.  This is useful for tracking wether or not

             we are in a system header.  */

          *dirp = cpp_get_dir (cpp_get_file (b));

          return n;

        }

    }

  return 0;

}

/* Return the value of darwin_macosx_version_min suitable for the

   __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ macro,

   so '10.4.2' becomes 1040.  The lowest digit is always zero.

   Print a warning if the version number can't be understood.  */

static const char *

version_as_macro (void)

{

  static char result[] = "1000";

  if (strncmp (darwin_macosx_version_min, "10.", 3) != 0)

    goto fail;

  if (! ISDIGIT (darwin_macosx_version_min[3]))

    goto fail;

  result[2] = darwin_macosx_version_min[3];

  if (darwin_macosx_version_min[4] != '\0'

      && darwin_macosx_version_min[4] != '.')

    goto fail;

  return result;

 fail:

  error ("unknown value %qs of -mmacosx-version-min",

         darwin_macosx_version_min);

  return "1000";

}

/* Define additional CPP flags for Darwin.   */

#define builtin_define(TXT) cpp_define (pfile, TXT)

void

darwin_cpp_builtins (cpp_reader *pfile)

{

  builtin_define ("__MACH__");

  builtin_define ("__APPLE__");

  /* __APPLE_CC__ is defined as some old Apple include files expect it

     to be defined and won't work if it isn't.  */

  builtin_define_with_value ("__APPLE_CC__", "1", false);

  if (darwin_constant_cfstrings)

    builtin_define ("__CONSTANT_CFSTRINGS__");

  builtin_define_with_value ("__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__",

                             version_as_macro(), false);

  /* Since we do not (at 4.6) support ObjC gc for the NeXT runtime, the

     following will cause a syntax error if one tries to compile gc attributed

     items.  However, without this, NeXT system headers cannot be parsed

     properly (on systems >= darwin 9).  */

  if (flag_objc_gc)

    {

      builtin_define ("__strong=__attribute__((objc_gc(strong)))");

      builtin_define ("__weak=__attribute__((objc_gc(weak)))");

      builtin_define ("__OBJC_GC__");

    }

  else

    {

      builtin_define ("__strong=");

      builtin_define ("__weak=");

    }

  if (flag_objc_abi == 2)

    builtin_define ("__OBJC2__");

}

/* Handle C family front-end options.  */

static bool

handle_c_option (size_t code,

                 const char *arg,

                 int value ATTRIBUTE_UNUSED)

{

  switch (code)

    {

    default:

      /* Unrecognized options that we said we'd handle turn into

         errors if not listed here.  */

      return false;

    case OPT_iframework:

      add_system_framework_path (xstrdup (arg));

      break;

    case OPT_fapple_kext:

      ;

    }

  /* We recognized the option.  */

  return true;

}

/* Allow ObjC* access to CFStrings.  */

static tree

darwin_objc_construct_string (tree str)

{

  if (!darwin_constant_cfstrings)

    {

    /* Even though we are not using CFStrings, place our literal

       into the cfstring_htab hash table, so that the

       darwin_constant_cfstring_p() function will see it.  */

      darwin_enter_string_into_cfstring_table (str);

      /* Fall back to NSConstantString.  */

      return NULL_TREE;

    }

  return darwin_build_constant_cfstring (str);

}

/* The string ref type is created as CFStringRef by <CFBase.h> therefore, we

   must match for it explicitly, since it's outside the gcc code.  */

static bool

darwin_cfstring_ref_p (const_tree strp)

{

  tree tn;

  if (!strp || TREE_CODE (strp) != POINTER_TYPE)

    return false;

  tn = TYPE_NAME (strp);

  if (tn)

    tn = DECL_NAME (tn);

  return (tn

          && IDENTIFIER_POINTER (tn)