gcc/config/darwin-c.c

   1 /* Darwin support needed only by C/C++ frontends.
   2    Copyright (C) 2001, 2003, 2004, 2005  Free Software Foundation, Inc.
   3    Contributed by Apple Computer Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  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 "c-pragma.h"
  29 #include "c-tree.h"
  30 #include "c-incpath.h"
  31 #include "toplev.h"
  32 #include "tm_p.h"
  33 #include "cppdefault.h"
  34 #include "prefix.h"
  35
  36 /* Pragmas.  */
  37
  38 #define BAD(gmsgid) do { warning (0, gmsgid); return; } while (0)
  39
  40 static bool using_frameworks = false;
  41
  42 /* Maintain a small stack of alignments.  This is similar to pragma
  43    pack's stack, but simpler.  */
  44
  45 static void push_field_alignment (int);
  46 static void pop_field_alignment (void);
  47 static const char *find_subframework_file (const char *, const char *);
  48 static void add_system_framework_path (char *);
  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 static void
  61 push_field_alignment (int bit_alignment)
  62 {
  63   align_stack *entry = (align_stack *) xmalloc (sizeof (align_stack));
  64
  65   entry->alignment = maximum_field_alignment;
  66   entry->prev = field_align_stack;
  67   field_align_stack = entry;
  68
  69   maximum_field_alignment = bit_alignment;
  70 }
  71
  72 static void
  73 pop_field_alignment (void)
  74 {
  75   if (field_align_stack)
  76     {
  77       align_stack *entry = field_align_stack;
  78
  79       maximum_field_alignment = entry->alignment;
  80       field_align_stack = entry->prev;
  81       free (entry);
  82     }
  83   else
  84     error ("too many #pragma options align=reset");
  85 }
  86
  87 /* Handlers for Darwin-specific pragmas.  */
  88
  89 void
  90 darwin_pragma_ignore (cpp_reader *pfile ATTRIBUTE_UNUSED)
  91 {
  92   /* Do nothing.  */
  93 }
  94
  95 /* #pragma options align={mac68k|power|reset} */
  96
  97 void
  98 darwin_pragma_options (cpp_reader *pfile ATTRIBUTE_UNUSED)
  99 {
 100   const char *arg;
 101   tree t, x;
 102
 103   if (c_lex (&t) != CPP_NAME)
 104     BAD ("malformed '#pragma options', ignoring");
 105   arg = IDENTIFIER_POINTER (t);
 106   if (strcmp (arg, "align"))
 107     BAD ("malformed '#pragma options', ignoring");
 108   if (c_lex (&t) != CPP_EQ)
 109     BAD ("malformed '#pragma options', ignoring");
 110   if (c_lex (&t) != CPP_NAME)
 111     BAD ("malformed '#pragma options', ignoring");
 112
 113   if (c_lex (&x) != CPP_EOF)
 114     warning (0, "junk at end of '#pragma options'");
 115
 116   arg = IDENTIFIER_POINTER (t);
 117   if (!strcmp (arg, "mac68k"))
 118     push_field_alignment (16);
 119   else if (!strcmp (arg, "power"))
 120     push_field_alignment (0);
 121   else if (!strcmp (arg, "reset"))
 122     pop_field_alignment ();
 123   else
 124     warning (0, "malformed '#pragma options align={mac68k|power|reset}', ignoring");
 125 }
 126
 127 /* #pragma unused ([var {, var}*]) */
 128
 129 void
 130 darwin_pragma_unused (cpp_reader *pfile ATTRIBUTE_UNUSED)
 131 {
 132   tree decl, x;
 133   int tok;
 134
 135   if (c_lex (&x) != CPP_OPEN_PAREN)
 136     BAD ("missing '(' after '#pragma unused', ignoring");
 137
 138   while (1)
 139     {
 140       tok = c_lex (&decl);
 141       if (tok == CPP_NAME && decl)
 142         {
 143           tree local = lookup_name (decl);
 144           if (local && (TREE_CODE (local) == PARM_DECL
 145                         || TREE_CODE (local) == VAR_DECL))
 146             TREE_USED (local) = 1;
 147           tok = c_lex (&x);
 148           if (tok != CPP_COMMA)
 149             break;
 150         }
 151     }
 152
 153   if (tok != CPP_CLOSE_PAREN)
 154     BAD ("missing ')' after '#pragma unused', ignoring");
 155
 156   if (c_lex (&x) != CPP_EOF)
 157     warning (0, "junk at end of '#pragma unused'");
 158 }
 159
 160 static struct {
 161   size_t len;
 162   const char *name;
 163   cpp_dir* dir;
 164 } *frameworks_in_use;
 165 static int num_frameworks = 0;
 166 static int max_frameworks = 0;
 167
 168
 169 /* Remember which frameworks have been seen, so that we can ensure
 170    that all uses of that framework come from the same framework.  DIR
 171    is the place where the named framework NAME, which is of length
 172    LEN, was found.  We copy the directory name from NAME, as it will be
 173    freed by others.  */
 174
 175 static void
 176 add_framework (const char *name, size_t len, cpp_dir *dir)
 177 {
 178   char *dir_name;
 179   int i;
 180   for (i = 0; i < num_frameworks; ++i)
 181     {
 182       if (len == frameworks_in_use[i].len
 183           && strncmp (name, frameworks_in_use[i].name, len) == 0)
 184         {
 185           return;
 186         }
 187     }
 188   if (i >= max_frameworks)
 189     {
 190       max_frameworks = i*2;
 191       max_frameworks += i == 0;
 192       frameworks_in_use = xrealloc (frameworks_in_use,
 193                                     max_frameworks*sizeof(*frameworks_in_use));
 194     }
 195   dir_name = xmalloc (len + 1);
 196   memcpy (dir_name, name, len);
 197   dir_name[len] = '\0';
 198   frameworks_in_use[num_frameworks].name = dir_name;
 199   frameworks_in_use[num_frameworks].len = len;
 200   frameworks_in_use[num_frameworks].dir = dir;
 201   ++num_frameworks;
 202 }
 203
 204 /* Recall if we have seen the named framework NAME, before, and where
 205    we saw it.  NAME is LEN bytes long.  The return value is the place
 206    where it was seen before.  */
 207
 208 static struct cpp_dir*
 209 find_framework (const char *name, size_t len)
 210 {
 211   int i;
 212   for (i = 0; i < num_frameworks; ++i)
 213     {
 214       if (len == frameworks_in_use[i].len
 215           && strncmp (name, frameworks_in_use[i].name, len) == 0)
 216         {
 217           return frameworks_in_use[i].dir;
 218         }
 219     }
 220   return 0;
 221 }
 222
 223 /* There are two directories in a framework that contain header files,
 224    Headers and PrivateHeaders.  We search Headers first as it is more
 225    common to upgrade a header from PrivateHeaders to Headers and when
 226    that is done, the old one might hang around and be out of data,
 227    causing grief.  */
 228
 229 struct framework_header {const char * dirName; int dirNameLen; };
 230 static struct framework_header framework_header_dirs[] = {
 231   { "Headers", 7 },
 232   { "PrivateHeaders", 14 },
 233   { NULL, 0 }
 234 };
 235
 236 /* Returns a pointer to a malloced string that contains the real pathname
 237    to the file, given the base name and the name.  */
 238
 239 static char *
 240 framework_construct_pathname (const char *fname, cpp_dir *dir)
 241 {
 242   char *buf;
 243   size_t fname_len, frname_len;
 244   cpp_dir *fast_dir;
 245   char *frname;
 246   struct stat st;
 247   int i;
 248
 249   /* Framework names must have a / in them.  */
 250   buf = strchr (fname, '/');
 251   if (buf)
 252     fname_len = buf - fname;
 253   else
 254     return 0;
 255
 256   fast_dir = find_framework (fname, fname_len);
 257
 258   /* Framework includes must all come from one framework.  */
 259   if (fast_dir && dir != fast_dir)
 260     return 0;
 261
 262   frname = xmalloc (strlen (fname) + dir->len + 2
 263                     + strlen(".framework/") + strlen("PrivateHeaders"));
 264   strncpy (&frname[0], dir->name, dir->len);
 265   frname_len = dir->len;
 266   if (frname_len && frname[frname_len-1] != '/')
 267     frname[frname_len++] = '/';
 268   strncpy (&frname[frname_len], fname, fname_len);
 269   frname_len += fname_len;
 270   strncpy (&frname[frname_len], ".framework/", strlen (".framework/"));
 271   frname_len += strlen (".framework/");
 272
 273   if (fast_dir == 0)
 274     {
 275       frname[frname_len-1] = 0;
 276       if (stat (frname, &st) == 0)
 277         {
 278           /* As soon as we find the first instance of the framework,
 279              we stop and never use any later instance of that
 280              framework.  */
 281           add_framework (fname, fname_len, dir);
 282         }
 283       else
 284         {
 285           /* If we can't find the parent directory, no point looking
 286              further.  */
 287           free (frname);
 288           return 0;
 289         }
 290       frname[frname_len-1] = '/';
 291     }
 292
 293   /* Append framework_header_dirs and header file name */
 294   for (i = 0; framework_header_dirs[i].dirName; i++)
 295     {
 296       strncpy (&frname[frname_len],
 297                framework_header_dirs[i].dirName,
 298                framework_header_dirs[i].dirNameLen);
 299       strcpy (&frname[frname_len + framework_header_dirs[i].dirNameLen],
 300               &fname[fname_len]);
 301
 302       if (stat (frname, &st) == 0)
 303         return frname;
 304     }
 305
 306   free (frname);
 307   return 0;
 308 }
 309
 310 /* Search for FNAME in sub-frameworks.  pname is the context that we
 311    wish to search in.  Return the path the file was found at,
 312    otherwise return 0.  */
 313
 314 static const char*
 315 find_subframework_file (const char *fname, const char *pname)
 316 {
 317   char *sfrname;
 318   const char *dot_framework = ".framework/";
 319   char *bufptr;
 320   int sfrname_len, i, fname_len;
 321   struct cpp_dir *fast_dir;
 322   static struct cpp_dir subframe_dir;
 323   struct stat st;
 324
 325   bufptr = strchr (fname, '/');
 326
 327   /* Subframework files must have / in the name.  */
 328   if (bufptr == 0)
 329     return 0;
 330
 331   fname_len = bufptr - fname;
 332   fast_dir = find_framework (fname, fname_len);
 333
 334   /* Sub framework header filename includes parent framework name and
 335      header name in the "CarbonCore/OSUtils.h" form. If it does not
 336      include slash it is not a sub framework include.  */
 337   bufptr = strstr (pname, dot_framework);
 338
 339   /* If the parent header is not of any framework, then this header
 340      cannot be part of any subframework.  */
 341   if (!bufptr)
 342     return 0;
 343
 344   /* Now translate. For example,                  +- bufptr
 345      fname = CarbonCore/OSUtils.h                 |
 346      pname = /System/Library/Frameworks/Foundation.framework/Headers/Foundation.h
 347      into
 348      sfrname = /System/Library/Frameworks/Foundation.framework/Frameworks/CarbonCore.framework/Headers/OSUtils.h */
 349
 350   sfrname = (char *) xmalloc (strlen (pname) + strlen (fname) + 2 +
 351                               strlen ("Frameworks/") + strlen (".framework/")
 352                               + strlen ("PrivateHeaders"));
 353
 354   bufptr += strlen (dot_framework);
 355
 356   sfrname_len = bufptr - pname;
 357
 358   strncpy (&sfrname[0], pname, sfrname_len);
 359
 360   strncpy (&sfrname[sfrname_len], "Frameworks/", strlen ("Frameworks/"));
 361   sfrname_len += strlen("Frameworks/");
 362
 363   strncpy (&sfrname[sfrname_len], fname, fname_len);
 364   sfrname_len += fname_len;
 365
 366   strncpy (&sfrname[sfrname_len], ".framework/", strlen (".framework/"));
 367   sfrname_len += strlen (".framework/");
 368
 369   /* Append framework_header_dirs and header file name */
 370   for (i = 0; framework_header_dirs[i].dirName; i++)
 371     {
 372       strncpy (&sfrname[sfrname_len],
 373                framework_header_dirs[i].dirName,
 374                framework_header_dirs[i].dirNameLen);
 375       strcpy (&sfrname[sfrname_len + framework_header_dirs[i].dirNameLen],
 376               &fname[fname_len]);
 377
 378       if (stat (sfrname, &st) == 0)
 379         {
 380           if (fast_dir != &subframe_dir)
 381             {
 382               if (fast_dir)
 383                 warning (0, "subframework include %s conflicts with framework include",
 384                          fname);
 385               else
 386                 add_framework (fname, fname_len, &subframe_dir);
 387             }
 388
 389           return sfrname;
 390         }
 391     }
 392   free (sfrname);
 393
 394   return 0;
 395 }
 396
 397 /* Add PATH to the system includes. PATH must be malloc-ed and
 398    NUL-terminated.  System framework paths are C++ aware.  */
 399
 400 static void
 401 add_system_framework_path (char *path)
 402 {
 403   int cxx_aware = 1;
 404   cpp_dir *p;
 405
 406   p = xmalloc (sizeof (cpp_dir));
 407   p->next = NULL;
 408   p->name = path;
 409   p->sysp = 1 + !cxx_aware;
 410   p->construct = framework_construct_pathname;
 411   using_frameworks = 1;
 412
 413   add_cpp_dir_path (p, SYSTEM);
 414 }
 415
 416 /* Add PATH to the bracket includes. PATH must be malloc-ed and
 417    NUL-terminated.  */
 418
 419 void
 420 add_framework_path (char *path)
 421 {
 422   cpp_dir *p;
 423
 424   p = xmalloc (sizeof (cpp_dir));
 425   p->next = NULL;
 426   p->name = path;
 427   p->sysp = 0;
 428   p->construct = framework_construct_pathname;
 429   using_frameworks = 1;
 430
 431   add_cpp_dir_path (p, BRACKET);
 432 }
 433
 434 static const char *framework_defaults [] =
 435   {
 436     "/System/Library/Frameworks",
 437     "/Library/Frameworks",
 438   };
 439
 440 /* Register the GNU objective-C runtime include path if STDINC.  */
 441
 442 void
 443 darwin_register_objc_includes (const char *sysroot, const char *iprefix,
 444                                int stdinc)
 445 {
 446   const char *fname;
 447   size_t len;
 448   /* We do not do anything if we do not want the standard includes. */
 449   if (!stdinc)
 450     return;
 451
 452   fname = GCC_INCLUDE_DIR "-gnu-runtime";
 453
 454   /* Register the GNU OBJC runtime include path if we are compiling  OBJC
 455     with GNU-runtime.  */
 456
 457   if (c_dialect_objc () && !flag_next_runtime)
 458     {
 459       char *str;
 460       /* See if our directory starts with the standard prefix.
 461          "Translate" them, i.e. replace /usr/local/lib/gcc... with
 462          IPREFIX and search them first.  */
 463       if (iprefix && (len = cpp_GCC_INCLUDE_DIR_len) != 0 && !sysroot
 464           && !strncmp (fname, cpp_GCC_INCLUDE_DIR, len))
 465         {
 466           str = concat (iprefix, fname + len, NULL);
 467           /* FIXME: wrap the headers for C++awareness.  */
 468           add_path (str, SYSTEM, /*c++aware=*/false, false);
 469         }
 470
 471       /* Should this directory start with the sysroot?  */
 472       if (sysroot)
 473         str = concat (sysroot, fname, NULL);
 474       else
 475         str = update_path (fname, "");
 476
 477       add_path (str, SYSTEM, /*c++aware=*/false, false);
 478     }
 479 }
 480
 481
 482 /* Register all the system framework paths if STDINC is true and setup
 483    the missing_header callback for subframework searching if any
 484    frameworks had been registered.  */
 485
 486 void
 487 darwin_register_frameworks (const char *sysroot,
 488                             const char *iprefix ATTRIBUTE_UNUSED, int stdinc)
 489 {
 490   if (stdinc)
 491     {
 492       size_t i;
 493
 494       /* Setup default search path for frameworks.  */
 495       for (i=0; i<sizeof (framework_defaults)/sizeof(const char *); ++i)
 496         {
 497           char *str;
 498           if (sysroot)
 499             str = concat (sysroot, xstrdup (framework_defaults [i]), NULL);
 500           else
 501             str = xstrdup (framework_defaults[i]);
 502           /* System Framework headers are cxx aware.  */
 503           add_system_framework_path (str);
 504         }
 505     }
 506
 507   if (using_frameworks)
 508     cpp_get_callbacks (parse_in)->missing_header = find_subframework_header;
 509 }
 510
 511 /* Search for HEADER in context dependent way.  The return value is
 512    the malloced name of a header to try and open, if any, or NULL
 513    otherwise.  This is called after normal header lookup processing
 514    fails to find a header.  We search each file in the include stack,
 515    using FUNC, starting from the most deeply nested include and
 516    finishing with the main input file.  We stop searching when FUNC
 517    returns nonzero.  */
 518
 519 static const char*
 520 find_subframework_header (cpp_reader *pfile, const char *header, cpp_dir **dirp)
 521 {
 522   const char *fname = header;
 523   struct cpp_buffer *b;
 524   const char *n;
 525
 526   for (b = cpp_get_buffer (pfile);
 527        b && cpp_get_file (b) && cpp_get_path (cpp_get_file (b));
 528        b = cpp_get_prev (b))
 529     {
 530       n = find_subframework_file (fname, cpp_get_path (cpp_get_file (b)));
 531       if (n)
 532         {
 533           /* Logically, the place where we found the subframework is
 534              the place where we found the Framework that contains the
 535              subframework.  This is useful for tracking wether or not
 536              we are in a system header.  */
 537           *dirp = cpp_get_dir (cpp_get_file (b));
 538           return n;
 539         }
 540     }
 541
 542   return 0;
 543 }