gcc/config/darwin-c.c

   1 /* Darwin support needed only by C/C++ frontends.
   2    Copyright (C) 2001, 2003, 2004, 2005, 2007, 2008, 2010, 2011
   3    Free Software Foundation, Inc.
   4    Contributed by Apple Computer Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "cpplib.h"
  27 #include "tree.h"
  28 #include "target.h"
  29 #include "incpath.h"
  30 #include "c-family/c-common.h"
  31 #include "c-family/c-pragma.h"
  32 #include "c-family/c-format.h"
  33 #include "diagnostic-core.h"
  34 #include "flags.h"
  35 #include "tm_p.h"
  36 #include "cppdefault.h"
  37 #include "prefix.h"
  38 #include "c-family/c-target.h"
  39 #include "c-family/c-target-def.h"
  40 #include "cgraph.h"
  41
  42 /* Pragmas.  */
  43
  44 #define BAD(gmsgid) do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
  45 #define BAD2(msgid, arg) do { warning (OPT_Wpragmas, msgid, arg); return; } while (0)
  46
  47 static bool using_frameworks = false;
  48
  49 static const char *find_subframework_header (cpp_reader *pfile, const char *header,
  50                                              cpp_dir **dirp);
  51
  52 typedef struct align_stack
  53 {
  54   int alignment;
  55   struct align_stack * prev;
  56 } align_stack;
  57
  58 static struct align_stack * field_align_stack = NULL;
  59
  60 /* Maintain a small stack of alignments.  This is similar to pragma
  61    pack's stack, but simpler.  */
  62
  63 static void
  64 push_field_alignment (int bit_alignment)
  65 {
  66   align_stack *entry = XNEW (align_stack);
  67
  68   entry->alignment = maximum_field_alignment;
  69   entry->prev = field_align_stack;
  70   field_align_stack = entry;
  71
  72   maximum_field_alignment = bit_alignment;
  73 }
  74
  75 static void
  76 pop_field_alignment (void)
  77 {
  78   if (field_align_stack)
  79     {
  80       align_stack *entry = field_align_stack;
  81
  82       maximum_field_alignment = entry->alignment;
  83       field_align_stack = entry->prev;
  84       free (entry);
  85     }
  86   else
  87     error ("too many #pragma options align=reset");
  88 }
  89
  90 /* Handlers for Darwin-specific pragmas.  */
  91
  92 void
  93 darwin_pragma_ignore (cpp_reader *pfile ATTRIBUTE_UNUSED)
  94 {
  95   /* Do nothing.  */
  96 }
  97
  98 /* #pragma options align={mac68k|power|reset} */
  99
 100 void
 101 darwin_pragma_options (cpp_reader *pfile ATTRIBUTE_UNUSED)
 102 {
 103   const char *arg;
 104   tree t, x;
 105
 106   if (pragma_lex (&t) != CPP_NAME)
 107     BAD ("malformed '#pragma options', ignoring");
 108   arg = IDENTIFIER_POINTER (t);
 109   if (strcmp (arg, "align"))
 110     BAD ("malformed '#pragma options', ignoring");
 111   if (pragma_lex (&t) != CPP_EQ)
 112     BAD ("malformed '#pragma options', ignoring");
 113   if (pragma_lex (&t) != CPP_NAME)
 114     BAD ("malformed '#pragma options', ignoring");
 115
 116   if (pragma_lex (&x) != CPP_EOF)
 117     warning (OPT_Wpragmas, "junk at end of '#pragma options'");
 118
 119   arg = IDENTIFIER_POINTER (t);
 120   if (!strcmp (arg, "mac68k"))
 121     push_field_alignment (16);
 122   else if (!strcmp (arg, "power"))
 123     push_field_alignment (0);
 124   else if (!strcmp (arg, "reset"))
 125     pop_field_alignment ();
 126   else
 127     BAD ("malformed '#pragma options align={mac68k|power|reset}', ignoring");
 128 }
 129
 130 /* #pragma unused ([var {, var}*]) */
 131
 132 void
 133 darwin_pragma_unused (cpp_reader *pfile ATTRIBUTE_UNUSED)
 134 {
 135   tree decl, x;
 136   int tok;
 137
 138   if (pragma_lex (&x) != CPP_OPEN_PAREN)
 139     BAD ("missing '(' after '#pragma unused', ignoring");
 140
 141   while (1)
 142     {
 143       tok = pragma_lex (&decl);
 144       if (tok == CPP_NAME && decl)
 145         {
 146           tree local = lookup_name (decl);
 147           if (local && (TREE_CODE (local) == PARM_DECL
 148                         || TREE_CODE (local) == VAR_DECL))
 149             {
 150               TREE_USED (local) = 1;
 151               DECL_READ_P (local) = 1;
 152             }
 153           tok = pragma_lex (&x);
 154           if (tok != CPP_COMMA)
 155             break;
 156         }
 157     }
 158
 159   if (tok != CPP_CLOSE_PAREN)
 160     BAD ("missing ')' after '#pragma unused', ignoring");
 161
 162   if (pragma_lex (&x) != CPP_EOF)
 163     BAD ("junk at end of '#pragma unused'");
 164 }
 165
 166 /* Parse the ms_struct pragma.  */
 167 void
 168 darwin_pragma_ms_struct (cpp_reader *pfile ATTRIBUTE_UNUSED)
 169 {
 170   const char *arg;
 171   tree t;
 172
 173   if (pragma_lex (&t) != CPP_NAME)
 174     BAD ("malformed '#pragma ms_struct', ignoring");
 175   arg = IDENTIFIER_POINTER (t);
 176
 177   if (!strcmp (arg, "on"))
 178     darwin_ms_struct = true;
 179   else if (!strcmp (arg, "off") || !strcmp (arg, "reset"))
 180     darwin_ms_struct = false;
 181   else
 182     BAD ("malformed '#pragma ms_struct {on|off|reset}', ignoring");
 183
 184   if (pragma_lex (&t) != CPP_EOF)
 185     BAD ("junk at end of '#pragma ms_struct'");
 186 }
 187
 188 static struct frameworks_in_use {
 189   size_t len;
 190   const char *name;
 191   cpp_dir* dir;
 192 } *frameworks_in_use;
 193 static int num_frameworks = 0;
 194 static int max_frameworks = 0;
 195
 196
 197 /* Remember which frameworks have been seen, so that we can ensure
 198    that all uses of that framework come from the same framework.  DIR
 199    is the place where the named framework NAME, which is of length
 200    LEN, was found.  We copy the directory name from NAME, as it will be
 201    freed by others.  */
 202
 203 static void
 204 add_framework (const char *name, size_t len, cpp_dir *dir)
 205 {
 206   char *dir_name;
 207   int i;
 208   for (i = 0; i < num_frameworks; ++i)
 209     {
 210       if (len == frameworks_in_use[i].len
 211           && strncmp (name, frameworks_in_use[i].name, len) == 0)
 212         {
 213           return;
 214         }
 215     }
 216   if (i >= max_frameworks)
 217     {
 218       max_frameworks = i*2;
 219       max_frameworks += i == 0;
 220       frameworks_in_use = XRESIZEVEC (struct frameworks_in_use,
 221                                       frameworks_in_use, max_frameworks);
 222     }
 223   dir_name = XNEWVEC (char, len + 1);
 224   memcpy (dir_name, name, len);
 225   dir_name[len] = '\0';
 226   frameworks_in_use[num_frameworks].name = dir_name;
 227   frameworks_in_use[num_frameworks].len = len;
 228   frameworks_in_use[num_frameworks].dir = dir;
 229   ++num_frameworks;
 230 }
 231
 232 /* Recall if we have seen the named framework NAME, before, and where
 233    we saw it.  NAME is LEN bytes long.  The return value is the place
 234    where it was seen before.  */
 235
 236 static struct cpp_dir*
 237 find_framework (const char *name, size_t len)
 238 {
 239   int i;
 240   for (i = 0; i < num_frameworks; ++i)
 241     {
 242       if (len == frameworks_in_use[i].len
 243           && strncmp (name, frameworks_in_use[i].name, len) == 0)
 244         {
 245           return frameworks_in_use[i].dir;
 246         }
 247     }
 248   return 0;
 249 }
 250
 251 /* There are two directories in a framework that contain header files,
 252    Headers and PrivateHeaders.  We search Headers first as it is more
 253    common to upgrade a header from PrivateHeaders to Headers and when
 254    that is done, the old one might hang around and be out of data,
 255    causing grief.  */
 256
 257 struct framework_header {const char * dirName; int dirNameLen; };
 258 static struct framework_header framework_header_dirs[] = {
 259   { "Headers", 7 },
 260   { "PrivateHeaders", 14 },
 261   { NULL, 0 }
 262 };
 263
 264 /* Returns a pointer to a malloced string that contains the real pathname
 265    to the file, given the base name and the name.  */
 266
 267 static char *
 268 framework_construct_pathname (const char *fname, cpp_dir *dir)
 269 {
 270   char *buf;
 271   size_t fname_len, frname_len;
 272   cpp_dir *fast_dir;
 273   char *frname;
 274   struct stat st;
 275   int i;
 276
 277   /* Framework names must have a / in them.  */
 278   buf = strchr (fname, '/');
 279   if (buf)
 280     fname_len = buf - fname;
 281   else
 282     return 0;
 283
 284   fast_dir = find_framework (fname, fname_len);
 285
 286   /* Framework includes must all come from one framework.  */
 287   if (fast_dir && dir != fast_dir)
 288     return 0;
 289
 290   frname = XNEWVEC (char, strlen (fname) + dir->len + 2
 291                     + strlen(".framework/") + strlen("PrivateHeaders"));
 292   strncpy (&frname[0], dir->name, dir->len);
 293   frname_len = dir->len;
 294   if (frname_len && frname[frname_len-1] != '/')
 295     frname[frname_len++] = '/';
 296   strncpy (&frname[frname_len], fname, fname_len);
 297   frname_len += fname_len;
 298   strncpy (&frname[frname_len], ".framework/", strlen (".framework/"));
 299   frname_len += strlen (".framework/");
 300
 301   if (fast_dir == 0)
 302     {
 303       frname[frname_len-1] = 0;
 304       if (stat (frname, &st) == 0)
 305         {
 306           /* As soon as we find the first instance of the framework,
 307              we stop and never use any later instance of that
 308              framework.  */
 309           add_framework (fname, fname_len, dir);
 310         }
 311       else
 312         {
 313           /* If we can't find the parent directory, no point looking
 314              further.  */
 315           free (frname);
 316           return 0;
 317         }
 318       frname[frname_len-1] = '/';
 319     }
 320
 321   /* Append framework_header_dirs and header file name */
 322   for (i = 0; framework_header_dirs[i].dirName; i++)
 323     {
 324       strncpy (&frname[frname_len],
 325                framework_header_dirs[i].dirName,
 326                framework_header_dirs[i].dirNameLen);
 327       strcpy (&frname[frname_len + framework_header_dirs[i].dirNameLen],
 328               &fname[fname_len]);
 329
 330       if (stat (frname, &st) == 0)
 331         return frname;
 332     }
 333
 334   free (frname);
 335   return 0;
 336 }
 337
 338 /* Search for FNAME in sub-frameworks.  pname is the context that we
 339    wish to search in.  Return the path the file was found at,
 340    otherwise return 0.  */
 341
 342 static const char*
 343 find_subframework_file (const char *fname, const char *pname)
 344 {
 345   char *sfrname;
 346   const char *dot_framework = ".framework/";
 347   char *bufptr;
 348   int sfrname_len, i, fname_len;
 349   struct cpp_dir *fast_dir;
 350   static struct cpp_dir subframe_dir;
 351   struct stat st;
 352
 353   bufptr = strchr (fname, '/');
 354
 355   /* Subframework files must have / in the name.  */
 356   if (bufptr == 0)
 357     return 0;
 358
 359   fname_len = bufptr - fname;
 360   fast_dir = find_framework (fname, fname_len);
 361
 362   /* Sub framework header filename includes parent framework name and
 363      header name in the "CarbonCore/OSUtils.h" form. If it does not
 364      include slash it is not a sub framework include.  */
 365   bufptr = strstr (pname, dot_framework);
 366
 367   /* If the parent header is not of any framework, then this header
 368      cannot be part of any subframework.  */
 369   if (!bufptr)
 370     return 0;
 371
 372   /* Now translate. For example,                  +- bufptr
 373      fname = CarbonCore/OSUtils.h                 |
 374      pname = /System/Library/Frameworks/Foundation.framework/Headers/Foundation.h
 375      into
 376      sfrname = /System/Library/Frameworks/Foundation.framework/Frameworks/CarbonCore.framework/Headers/OSUtils.h */
 377
 378   sfrname = XNEWVEC (char, strlen (pname) + strlen (fname) + 2 +
 379                               strlen ("Frameworks/") + strlen (".framework/")
 380                               + strlen ("PrivateHeaders"));
 381
 382   bufptr += strlen (dot_framework);
 383
 384   sfrname_len = bufptr - pname;
 385
 386   strncpy (&sfrname[0], pname, sfrname_len);
 387
 388   strncpy (&sfrname[sfrname_len], "Frameworks/", strlen ("Frameworks/"));
 389   sfrname_len += strlen("Frameworks/");
 390
 391   strncpy (&sfrname[sfrname_len], fname, fname_len);
 392   sfrname_len += fname_len;
 393
 394   strncpy (&sfrname[sfrname_len], ".framework/", strlen (".framework/"));
 395   sfrname_len += strlen (".framework/");
 396
 397   /* Append framework_header_dirs and header file name */
 398   for (i = 0; framework_header_dirs[i].dirName; i++)
 399     {
 400       strncpy (&sfrname[sfrname_len],
 401                framework_header_dirs[i].dirName,
 402                framework_header_dirs[i].dirNameLen);
 403       strcpy (&sfrname[sfrname_len + framework_header_dirs[i].dirNameLen],
 404               &fname[fname_len]);
 405
 406       if (stat (sfrname, &st) == 0)
 407         {
 408           if (fast_dir != &subframe_dir)
 409             {
 410               if (fast_dir)
 411                 warning (0, "subframework include %s conflicts with framework include",
 412                          fname);
 413               else
 414                 add_framework (fname, fname_len, &subframe_dir);
 415             }
 416
 417           return sfrname;
 418         }
 419     }
 420   free (sfrname);
 421
 422   return 0;
 423 }
 424
 425 /* Add PATH to the system includes. PATH must be malloc-ed and
 426    NUL-terminated.  System framework paths are C++ aware.  */
 427
 428 static void
 429 add_system_framework_path (char *path)
 430 {
 431   int cxx_aware = 1;
 432   cpp_dir *p;
 433
 434   p = XNEW (cpp_dir);
 435   p->next = NULL;
 436   p->name = path;
 437   p->sysp = 1 + !cxx_aware;
 438   p->construct = framework_construct_pathname;
 439   using_frameworks = 1;
 440
 441   add_cpp_dir_path (p, SYSTEM);
 442 }
 443
 444 /* Add PATH to the bracket includes. PATH must be malloc-ed and
 445    NUL-terminated.  */
 446
 447 void
 448 add_framework_path (char *path)
 449 {
 450   cpp_dir *p;
 451
 452   p = XNEW (cpp_dir);
 453   p->next = NULL;
 454   p->name = path;
 455   p->sysp = 0;
 456   p->construct = framework_construct_pathname;
 457   using_frameworks = 1;
 458
 459   add_cpp_dir_path (p, BRACKET);
 460 }
 461
 462 static const char *framework_defaults [] =
 463   {
 464     "/System/Library/Frameworks",
 465     "/Library/Frameworks",
 466   };
 467
 468 /* Register the GNU objective-C runtime include path if STDINC.  */
 469
 470 void
 471 darwin_register_objc_includes (const char *sysroot, const char *iprefix,
 472                                int stdinc)
 473 {
 474   const char *fname;
 475   size_t len;
 476   /* We do not do anything if we do not want the standard includes. */
 477   if (!stdinc)
 478     return;
 479
 480   fname = GCC_INCLUDE_DIR "-gnu-runtime";
 481
 482   /* Register the GNU OBJC runtime include path if we are compiling  OBJC
 483     with GNU-runtime.  */
 484
 485   if (c_dialect_objc () && !flag_next_runtime)
 486     {
 487       char *str;
 488       /* See if our directory starts with the standard prefix.
 489          "Translate" them, i.e. replace /usr/local/lib/gcc... with
 490          IPREFIX and search them first.  */
 491       if (iprefix && (len = cpp_GCC_INCLUDE_DIR_len) != 0 && !sysroot
 492           && !strncmp (fname, cpp_GCC_INCLUDE_DIR, len))
 493         {
 494           str = concat (iprefix, fname + len, NULL);
 495           /* FIXME: wrap the headers for C++awareness.  */
 496           add_path (str, SYSTEM, /*c++aware=*/false, false);
 497         }
 498
 499       /* Should this directory start with the sysroot?  */
 500       if (sysroot)
 501         str = concat (sysroot, fname, NULL);
 502       else
 503         str = update_path (fname, "");
 504
 505       add_path (str, SYSTEM, /*c++aware=*/false, false);
 506     }
 507 }
 508
 509
 510 /* Register all the system framework paths if STDINC is true and setup
 511    the missing_header callback for subframework searching if any
 512    frameworks had been registered.  */
 513
 514 void
 515 darwin_register_frameworks (const char *sysroot,
 516                             const char *iprefix ATTRIBUTE_UNUSED, int stdinc)
 517 {
 518   if (stdinc)
 519     {
 520       size_t i;
 521
 522       /* Setup default search path for frameworks.  */
 523       for (i=0; i<sizeof (framework_defaults)/sizeof(const char *); ++i)
 524         {
 525           char *str;
 526           if (sysroot)
 527             str = concat (sysroot, xstrdup (framework_defaults [i]), NULL);
 528           else
 529             str = xstrdup (framework_defaults[i]);
 530           /* System Framework headers are cxx aware.  */
 531           add_system_framework_path (str);
 532         }
 533     }
 534
 535   if (using_frameworks)
 536     cpp_get_callbacks (parse_in)->missing_header = find_subframework_header;
 537 }
 538
 539 /* Search for HEADER in context dependent way.  The return value is
 540    the malloced name of a header to try and open, if any, or NULL
 541    otherwise.  This is called after normal header lookup processing
 542    fails to find a header.  We search each file in the include stack,
 543    using FUNC, starting from the most deeply nested include and
 544    finishing with the main input file.  We stop searching when FUNC
 545    returns nonzero.  */
 546
 547 static const char*
 548 find_subframework_header (cpp_reader *pfile, const char *header, cpp_dir **dirp)
 549 {
 550   const char *fname = header;
 551   struct cpp_buffer *b;
 552   const char *n;
 553
 554   for (b = cpp_get_buffer (pfile);
 555        b && cpp_get_file (b) && cpp_get_path (cpp_get_file (b));
 556        b = cpp_get_prev (b))
 557     {
 558       n = find_subframework_file (fname, cpp_get_path (cpp_get_file (b)));
 559       if (n)
 560         {
 561           /* Logically, the place where we found the subframework is
 562              the place where we found the Framework that contains the
 563              subframework.  This is useful for tracking wether or not
 564              we are in a system header.  */
 565           *dirp = cpp_get_dir (cpp_get_file (b));
 566           return n;
 567         }
 568     }
 569
 570   return 0;
 571 }
 572
 573 /* Return the value of darwin_macosx_version_min suitable for the
 574    __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ macro,
 575    so '10.4.2' becomes 1040.  The lowest digit is always zero.
 576    Print a warning if the version number can't be understood.  */
 577 static const char *
 578 version_as_macro (void)
 579 {
 580   static char result[] = "1000";
 581
 582   if (strncmp (darwin_macosx_version_min, "10.", 3) != 0)
 583     goto fail;
 584   if (! ISDIGIT (darwin_macosx_version_min[3]))
 585     goto fail;
 586   result[2] = darwin_macosx_version_min[3];
 587   if (darwin_macosx_version_min[4] != '\0'
 588       && darwin_macosx_version_min[4] != '.')
 589     goto fail;
 590
 591   return result;
 592
 593  fail:
 594   error ("unknown value %qs of -mmacosx-version-min",
 595          darwin_macosx_version_min);
 596   return "1000";
 597 }
 598
 599 /* Define additional CPP flags for Darwin.   */
 600
 601 #define builtin_define(TXT) cpp_define (pfile, TXT)
 602
 603 void
 604 darwin_cpp_builtins (cpp_reader *pfile)
 605 {
 606   builtin_define ("__MACH__");
 607   builtin_define ("__APPLE__");
 608
 609   /* __APPLE_CC__ is defined as some old Apple include files expect it
 610      to be defined and won't work if it isn't.  */
 611   builtin_define_with_value ("__APPLE_CC__", "1", false);
 612
 613   if (darwin_constant_cfstrings)
 614     builtin_define ("__CONSTANT_CFSTRINGS__");
 615
 616   builtin_define_with_value ("__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__",
 617                              version_as_macro(), false);
 618
 619   /* Since we do not (at 4.6) support ObjC gc for the NeXT runtime, the
 620      following will cause a syntax error if one tries to compile gc attributed
 621      items.  However, without this, NeXT system headers cannot be parsed
 622      properly (on systems >= darwin 9).  */
 623   if (flag_objc_gc)
 624     {
 625       builtin_define ("__strong=__attribute__((objc_gc(strong)))");
 626       builtin_define ("__weak=__attribute__((objc_gc(weak)))");
 627       builtin_define ("__OBJC_GC__");
 628     }
 629   else
 630     {
 631       builtin_define ("__strong=");
 632       builtin_define ("__weak=");
 633     }
 634
 635   if (flag_objc_abi == 2)
 636     builtin_define ("__OBJC2__");
 637 }
 638
 639 /* Handle C family front-end options.  */
 640
 641 static bool
 642 handle_c_option (size_t code,
 643                  const char *arg,
 644                  int value ATTRIBUTE_UNUSED)
 645 {
 646   switch (code)
 647     {
 648     default:
 649       /* Unrecognized options that we said we'd handle turn into
 650          errors if not listed here.  */
 651       return false;
 652
 653     case OPT_iframework:
 654       add_system_framework_path (xstrdup (arg));
 655       break;
 656
 657     case OPT_fapple_kext:
 658       ;
 659     }
 660
 661   /* We recognized the option.  */
 662   return true;
 663 }
 664
 665 /* Allow ObjC* access to CFStrings.  */
 666 static tree
 667 darwin_objc_construct_string (tree str)
 668 {
 669   if (!darwin_constant_cfstrings)
 670     {
 671     /* Even though we are not using CFStrings, place our literal
 672        into the cfstring_htab hash table, so that the
 673        darwin_constant_cfstring_p() function will see it.  */
 674       darwin_enter_string_into_cfstring_table (str);
 675       /* Fall back to NSConstantString.  */
 676       return NULL_TREE;
 677     }
 678
 679   return darwin_build_constant_cfstring (str);
 680 }
 681
 682 /* The string ref type is created as CFStringRef by <CFBase.h> therefore, we
 683    must match for it explicitly, since it's outside the gcc code.  */
 684
 685 static bool
 686 darwin_cfstring_ref_p (const_tree strp)
 687 {
 688   tree tn;
 689   if (!strp || TREE_CODE (strp) != POINTER_TYPE)
 690     return false;
 691
 692   tn = TYPE_NAME (strp);
 693   if (tn)
 694     tn = DECL_NAME (tn);
 695   return (tn
 696           && IDENTIFIER_POINTER (tn)
 697           && !strncmp (IDENTIFIER_POINTER (tn), "CFStringRef", 8));
 698 }
 699
 700 /* At present the behavior of this is undefined and it does nothing.  */
 701 static void
 702 darwin_check_cfstring_format_arg (tree ARG_UNUSED (format_arg),
 703                                   tree ARG_UNUSED (args_list))
 704 {
 705 }
 706
 707 /* The extra format types we recognize.  */
 708 EXPORTED_CONST format_kind_info darwin_additional_format_types[] = {
 709   { "CFString",   NULL,  NULL, NULL, NULL,
 710     NULL, NULL,
 711     FMT_FLAG_ARG_CONVERT|FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL, 0, 0, 0, 0, 0, 0,
 712     NULL, NULL
 713   }
 714 };
 715
 716
 717 /* Support routines to dump the class references for NeXT ABI v1, aka
 718    32-bits ObjC-2.0, as top-level asms.
 719    The following two functions should only be called from
 720    objc/objc-next-runtime-abi-01.c.  */
 721
 722 static void
 723 darwin_objc_declare_unresolved_class_reference (const char *name)
 724 {
 725   const char *lazy_reference = ".lazy_reference\t";
 726   const char *hard_reference = ".reference\t";
 727   const char *reference = MACHOPIC_INDIRECT ? lazy_reference : hard_reference;
 728   size_t len = strlen (reference) + strlen(name) + 2;
 729   char *buf = (char *) alloca (len);
 730
 731   gcc_checking_assert (!strncmp (name, ".objc_class_name_", 17));
 732
 733   snprintf (buf, len, "%s%s", reference, name);
 734   add_asm_node (build_string (strlen (buf), buf));
 735 }
 736
 737 static void
 738 darwin_objc_declare_class_definition (const char *name)
 739 {
 740   const char *xname = targetm.strip_name_encoding (name);
 741   size_t len = strlen (xname) + 7 + 5;
 742   char *buf = (char *) alloca (len);
 743
 744   gcc_checking_assert (!strncmp (name, ".objc_class_name_", 17)
 745                        || !strncmp (name, "*.objc_category_name_", 21));
 746
 747   /* Mimic default_globalize_label.  */
 748   snprintf (buf, len, ".globl\t%s", xname);
 749   add_asm_node (build_string (strlen (buf), buf));
 750
 751   snprintf (buf, len, "%s = 0", xname);
 752   add_asm_node (build_string (strlen (buf), buf));
 753 }
 754
 755 #undef  TARGET_HANDLE_C_OPTION
 756 #define TARGET_HANDLE_C_OPTION handle_c_option
 757
 758 #undef  TARGET_OBJC_CONSTRUCT_STRING_OBJECT
 759 #define TARGET_OBJC_CONSTRUCT_STRING_OBJECT darwin_objc_construct_string
 760
 761 #undef  TARGET_OBJC_DECLARE_UNRESOLVED_CLASS_REFERENCE
 762 #define TARGET_OBJC_DECLARE_UNRESOLVED_CLASS_REFERENCE \
 763         darwin_objc_declare_unresolved_class_reference
 764
 765 #undef  TARGET_OBJC_DECLARE_CLASS_DEFINITION
 766 #define TARGET_OBJC_DECLARE_CLASS_DEFINITION \
 767         darwin_objc_declare_class_definition
 768
 769 #undef  TARGET_STRING_OBJECT_REF_TYPE_P
 770 #define TARGET_STRING_OBJECT_REF_TYPE_P darwin_cfstring_ref_p
 771
 772 #undef TARGET_CHECK_STRING_OBJECT_FORMAT_ARG
 773 #define TARGET_CHECK_STRING_OBJECT_FORMAT_ARG darwin_check_cfstring_format_arg
 774
 775 struct gcc_targetcm targetcm = TARGETCM_INITIALIZER;