gcc/config/darwin.h

   1 /* Target definitions for Darwin (Mac OS X) systems.
   2    Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001
   3    Free Software Foundation, Inc.
   4    Contributed by Apple Computer Inc.
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC 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 2, or (at your option)
  11 any later version.
  12
  13 GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 /* The definitions in this file are common to all processor types
  24    running Darwin, which is the kernel for Mac OS X.  Darwin is
  25    basically a BSD user layer laid over a Mach kernel, then evolved
  26    for many years (at NeXT) in parallel with other Unix systems.  So
  27    while the runtime is a somewhat idiosyncratic Mach-based thing,
  28    other definitions look like they would for a BSD variant.  */
  29
  30 /* Although NeXT ran on many different architectures, as of Jan 2001
  31    the only supported Darwin targets are PowerPC and x86.  */
  32
  33 /* Technically, STANDARD_EXEC_PREFIX should be /usr/libexec/, but in
  34    practice this makes it hard to install new compilers elsewhere, so
  35    leave it undefined and expect system builders to set configure args
  36    correctly.  */
  37
  38 /* Suppress g++ attempt to link in the math library automatically.
  39    (Some Darwin versions have a libm, but they seem to cause problems
  40    for C++ executables.)  */
  41
  42 #define MATH_LIBRARY ""
  43
  44 /* We have atexit.  */
  45
  46 #define HAVE_ATEXIT
  47
  48 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
  49
  50 #define DO_GLOBAL_DTORS_BODY
  51
  52 /* The string value for __SIZE_TYPE__.  */
  53
  54 #ifndef SIZE_TYPE
  55 #define SIZE_TYPE "long unsigned int"
  56 #endif
  57
  58 /* Type used for ptrdiff_t, as a string used in a declaration.  */
  59
  60 #undef  PTRDIFF_TYPE
  61 #define PTRDIFF_TYPE "int"
  62
  63 /* wchar_t is int.  */
  64
  65 #undef  WCHAR_TYPE
  66 #define WCHAR_TYPE "int"
  67 #undef  WCHAR_TYPE_SIZE
  68 #define WCHAR_TYPE_SIZE 32
  69
  70 /* Default to using the NeXT-style runtime, since that's what is
  71    pre-installed on Darwin systems.  */
  72
  73 #define NEXT_OBJC_RUNTIME
  74
  75 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  76    we want to retain compatibility with older gcc versions.  */
  77
  78 #undef  DEFAULT_PCC_STRUCT_RETURN
  79 #define DEFAULT_PCC_STRUCT_RETURN 0
  80
  81 /* Don't warn about MacOS-style 'APPL' four-char-constants.  */
  82
  83 #undef WARN_FOUR_CHAR_CONSTANTS
  84 #define WARN_FOUR_CHAR_CONSTANTS 0
  85
  86 /* Machine dependent cpp options.  */
  87
  88 /* The sequence here allows us to get a more specific version number
  89    glued into __APPLE_CC__.  Normally this number would be updated as
  90    part of submitting to a release engineering organization.  */
  91
  92 #ifndef APPLE_CC
  93 #define APPLE_CC 999
  94 #endif
  95
  96 #define STRINGIFY_THIS(x) # x
  97 #define REALLY_STRINGIFY(x) STRINGIFY_THIS(x)
  98
  99 #undef  CPP_SPEC
 100 #define CPP_SPEC "-D__APPLE_CC__=" REALLY_STRINGIFY(APPLE_CC) " \
 101                   %{static:-D__STATIC__}%{!static:-D__DYNAMIC__}"
 102
 103 /* Machine dependent libraries.  */
 104
 105 #undef  LIB_SPEC
 106 #define LIB_SPEC "%{!static:-lSystem}"
 107
 108 /* We specify crt0.o as -lcrt0.o so that ld will search the library path. */
 109
 110 #undef  STARTFILE_SPEC
 111 #define STARTFILE_SPEC  \
 112   "%{pg:%{static:-lgcrt0.o}%{!static:-lgcrt1.o}} \
 113     %{!pg:%{static:-lcrt0.o}%{!static:-lcrt1.o}}"
 114
 115 #undef  DOLLARS_IN_IDENTIFIERS
 116 #define DOLLARS_IN_IDENTIFIERS 2
 117
 118 /* Allow #sccs (but don't do anything). */
 119
 120 #define SCCS_DIRECTIVE
 121
 122 /* We use Dbx symbol format.  */
 123
 124 #define DBX_DEBUGGING_INFO
 125
 126 /* Also enable Dwarf 2 as an option.  */
 127
 128 #define DWARF2_DEBUGGING_INFO
 129
 130 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 131
 132 /* When generating stabs debugging, use N_BINCL entries.  */
 133
 134 #define DBX_USE_BINCL
 135
 136 /* There is no limit to the length of stabs strings.  */
 137
 138 #define DBX_CONTIN_LENGTH 0
 139
 140 /* gdb needs a null N_SO at the end of each file for scattered loading. */
 141
 142 #undef  DBX_OUTPUT_MAIN_SOURCE_FILE_END
 143 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME)                 \
 144 do { text_section ();                                                   \
 145      fprintf (FILE,                                                     \
 146               "\t.stabs \"%s\",%d,0,0,Letext\nLetext:\n", "" , N_SO);   \
 147    } while (0)
 148
 149 /* Our profiling scheme doesn't LP labels and counter words.  */
 150
 151 #define NO_PROFILE_COUNTERS
 152
 153 /* Don't use .gcc_compiled symbols to communicate with GDB;
 154    They interfere with numerically sorted symbol lists. */
 155
 156 #undef  ASM_IDENTIFY_GCC
 157 #define ASM_IDENTIFY_GCC(asm_out_file)
 158
 159 #undef  INIT_SECTION_ASM_OP
 160 #define INIT_SECTION_ASM_OP
 161
 162 #undef  INVOKE__main
 163
 164 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 165 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 166
 167
 168 /* Don't output a .file directive.  That is only used by the assembler for
 169    error reporting.  */
 170
 171 #undef  ASM_FILE_START
 172 #define ASM_FILE_START(FILE)
 173
 174 #undef  ASM_FILE_END
 175 #define ASM_FILE_END(FILE)                                      \
 176   do {                                                          \
 177     machopic_finish (asm_out_file);                             \
 178     if (strcmp (language_string, "GNU C++") == 0)               \
 179       {                                                         \
 180         constructor_section ();                                 \
 181         destructor_section ();                                  \
 182         ASM_OUTPUT_ALIGN (FILE, 1);                             \
 183       }                                                         \
 184   } while (0)
 185
 186 /* Give ObjcC methods pretty symbol names. */
 187
 188 #undef  OBJC_GEN_METHOD_LABEL
 189 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 190   do { if (CAT_NAME)                                                    \
 191          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 192                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 193        else                                                             \
 194          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 195                   (CLASS_NAME), (SEL_NAME));                            \
 196      } while (0)
 197
 198 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 199    but it does need to be referenced via indirect PIC data pointers.
 200    The machopic_define_name calls are telling the machopic subsystem
 201    that the name *is* defined in this module, so it doesn't need to
 202    make them indirect.  */
 203
 204 #undef ASM_DECLARE_OBJECT_NAME
 205 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 206   do {                                                                  \
 207     char *xname = NAME;                                                 \
 208     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 209       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 210     if ((TREE_STATIC (DECL)                                             \
 211          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 212         || DECL_INITIAL (DECL))                                         \
 213       machopic_define_name (xname);                                     \
 214     if ((TREE_STATIC (DECL)                                             \
 215          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 216         || DECL_INITIAL (DECL))                                         \
 217       ENCODE_SECTION_INFO (DECL);  \
 218     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 219   } while (0)
 220
 221 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 222   do {                                                                  \
 223     char *xname = NAME;                                                 \
 224     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 225       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 226     if ((TREE_STATIC (DECL)                                             \
 227          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 228         || DECL_INITIAL (DECL))                                         \
 229       machopic_define_name (xname);                                     \
 230     if ((TREE_STATIC (DECL)                                             \
 231          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 232         || DECL_INITIAL (DECL))                                         \
 233       ENCODE_SECTION_INFO (DECL);                                       \
 234     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 235   } while (0)
 236
 237 /* Wrap new method names in quotes so the assembler doesn't gag.
 238    Make Objective-C internal symbols local.  */
 239
 240 #undef  ASM_OUTPUT_LABELREF
 241 #define ASM_OUTPUT_LABELREF(FILE,NAME)  \
 242   do {                                                                  \
 243        STRIP_NAME_ENCODING (NAME, NAME);  \
 244        if (NAME[0] == '&' || NAME[0] == '*')                            \
 245          {                                                              \
 246            int len = strlen (NAME);                                     \
 247            if (len > 6 && !strcmp ("$stub", NAME + len - 5))            \
 248              machopic_validate_stub_or_non_lazy_ptr (NAME, 1);          \
 249            else if (len > 7 && !strcmp ("$stub\"", NAME + len - 6))     \
 250              machopic_validate_stub_or_non_lazy_ptr (NAME, 1);          \
 251            else if (len > 14 && !strcmp ("$non_lazy_ptr", NAME + len - 13)) \
 252              machopic_validate_stub_or_non_lazy_ptr (NAME, 0);          \
 253            fputs (&NAME[1], FILE); \
 254          } \
 255        else if (NAME[0] == '+' || NAME[0] == '-')   \
 256          fprintf (FILE, "\"%s\"", NAME); \
 257        else if (!strncmp (NAME, "_OBJC_", 6))  \
 258          fprintf (FILE, "L%s", NAME);   \
 259        else if (!strncmp (NAME, ".objc_class_name_", 17))               \
 260          fprintf (FILE, "%s", NAME);                                    \
 261        else                                                             \
 262          fprintf (FILE, "_%s", NAME);                                   \
 263   } while (0)
 264
 265 /* The standard fillin directives are unaligned.  */
 266
 267 #define UNALIGNED_SHORT_ASM_OP          "\t.short\t"
 268 #define UNALIGNED_INT_ASM_OP            "\t.long\t"
 269 /* Don't try to use this before the assembler knows about it.  */
 270 /* #define UNALIGNED_DOUBLE_INT_ASM_OP     "\t.quad\t"  */
 271
 272 #undef  ALIGN_ASM_OP
 273 #define ALIGN_ASM_OP            ".align"
 274
 275 #undef  ASM_OUTPUT_ALIGN
 276 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 277   if ((LOG) != 0)                       \
 278     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
 279
 280 /* Ensure correct alignment of bss data.  */
 281
 282 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 283 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
 284   do {  \
 285     fputs (".lcomm ", (FILE));                          \
 286     assemble_name ((FILE), (NAME));                     \
 287     fprintf ((FILE), ",%u,%u\n", (SIZE), floor_log2 ((ALIGN) / BITS_PER_UNIT)); \
 288     if ((DECL) && ((TREE_STATIC (DECL)                                             \
 289          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 290         || DECL_INITIAL (DECL)))                                         \
 291       ENCODE_SECTION_INFO (DECL);  \
 292     if ((DECL) && ((TREE_STATIC (DECL)                                             \
 293          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 294         || DECL_INITIAL (DECL)))                                         \
 295       machopic_define_name (NAME);                                     \
 296   } while (0)
 297
 298 /* Output nothing for #ident.  */
 299
 300 #undef  ASM_OUTPUT_IDENT
 301 #define ASM_OUTPUT_IDENT(FILE, NAME)
 302
 303 /* The maximum alignment which the object file format can support.
 304    For Mach-O, this is 2^15.  */
 305
 306 #undef  MAX_OFILE_ALIGNMENT
 307 #define MAX_OFILE_ALIGNMENT 0x8000
 308
 309 /* Create new Mach-O sections. */
 310
 311 #undef  SECTION_FUNCTION
 312 #define SECTION_FUNCTION(FUNCTION, SECTION, DIRECTIVE, OBJC)            \
 313 void                                                                    \
 314 FUNCTION ()                                                             \
 315 {                                                                       \
 316   extern void objc_section_init ();                                     \
 317                                                                         \
 318   if (in_section != SECTION)                                            \
 319     {                                                                   \
 320       if (OBJC)                                                         \
 321         objc_section_init ();                                           \
 322       data_section ();                                                  \
 323       if (asm_out_file)                                                 \
 324         fprintf (asm_out_file, "%s\n", DIRECTIVE);                      \
 325       in_section = SECTION;                                             \
 326     }                                                                   \
 327 }                                                                       \
 328
 329 #define ALIAS_SECTION(enum_value, alias_name)                           \
 330 do { if (!strcmp (alias_name, name))                                    \
 331        section_alias[enum_value] = (alias ? get_identifier (alias) : 0);  \
 332    } while (0)
 333
 334 /* Darwin uses many types of special sections.  */
 335
 336 #undef  EXTRA_SECTIONS
 337 #define EXTRA_SECTIONS                                  \
 338   in_const, in_const_data, in_cstring, in_literal4, in_literal8,        \
 339   in_constructor, in_destructor, in_mod_init, in_mod_term,              \
 340   in_objc_class, in_objc_meta_class, in_objc_category,  \
 341   in_objc_class_vars, in_objc_instance_vars,            \
 342   in_objc_cls_meth, in_objc_inst_meth,                  \
 343   in_objc_cat_cls_meth, in_objc_cat_inst_meth,          \
 344   in_objc_selector_refs,                                \
 345   in_objc_selector_fixup,                               \
 346   in_objc_symbols, in_objc_module_info,                 \
 347   in_objc_protocol, in_objc_string_object,              \
 348   in_objc_constant_string_object,                       \
 349   in_objc_class_names, in_objc_meth_var_names,          \
 350   in_objc_meth_var_types, in_objc_cls_refs,             \
 351   in_machopic_nl_symbol_ptr,                            \
 352   in_machopic_lazy_symbol_ptr,                          \
 353   in_machopic_symbol_stub,                              \
 354   in_machopic_picsymbol_stub,                           \
 355   in_darwin_exception, \
 356   num_sections
 357
 358 #undef  EXTRA_SECTION_FUNCTIONS
 359 #define EXTRA_SECTION_FUNCTIONS                 \
 360 SECTION_FUNCTION (const_section,                \
 361                   in_const,                     \
 362                   ".const", 0)                  \
 363 SECTION_FUNCTION (const_data_section,           \
 364                   in_const_data,                \
 365                   ".const_data", 0)             \
 366 SECTION_FUNCTION (cstring_section,              \
 367                   in_cstring,                   \
 368                   ".cstring", 0)                \
 369 SECTION_FUNCTION (literal4_section,             \
 370                   in_literal4,                  \
 371                   ".literal4", 0)               \
 372 SECTION_FUNCTION (literal8_section,             \
 373                   in_literal8,                  \
 374                   ".literal8", 0)               \
 375 SECTION_FUNCTION (constructor_section,          \
 376                   in_constructor,               \
 377                   ".constructor", 0)            \
 378 SECTION_FUNCTION (mod_init_section,             \
 379                   in_mod_init,                  \
 380                   ".mod_init_func", 0)  \
 381 SECTION_FUNCTION (mod_term_section, \
 382                   in_mod_term,                  \
 383                   ".mod_term_func", 0)  \
 384 SECTION_FUNCTION (destructor_section,           \
 385                   in_destructor,                \
 386                   ".destructor", 0)             \
 387 SECTION_FUNCTION (objc_class_section,           \
 388                   in_objc_class,                \
 389                   ".objc_class", 1)             \
 390 SECTION_FUNCTION (objc_meta_class_section,      \
 391                   in_objc_meta_class,           \
 392                   ".objc_meta_class", 1)        \
 393 SECTION_FUNCTION (objc_category_section,        \
 394                   in_objc_category,             \
 395                 ".objc_category", 1)            \
 396 SECTION_FUNCTION (objc_class_vars_section,      \
 397                   in_objc_class_vars,           \
 398                   ".objc_class_vars", 1)        \
 399 SECTION_FUNCTION (objc_instance_vars_section,   \
 400                   in_objc_instance_vars,        \
 401                   ".objc_instance_vars", 1)     \
 402 SECTION_FUNCTION (objc_cls_meth_section,        \
 403                   in_objc_cls_meth,             \
 404                   ".objc_cls_meth", 1)  \
 405 SECTION_FUNCTION (objc_inst_meth_section,       \
 406                   in_objc_inst_meth,            \
 407                   ".objc_inst_meth", 1) \
 408 SECTION_FUNCTION (objc_cat_cls_meth_section,    \
 409                   in_objc_cat_cls_meth,         \
 410                   ".objc_cat_cls_meth", 1)      \
 411 SECTION_FUNCTION (objc_cat_inst_meth_section,   \
 412                   in_objc_cat_inst_meth,        \
 413                   ".objc_cat_inst_meth", 1)     \
 414 SECTION_FUNCTION (objc_selector_refs_section,   \
 415                   in_objc_selector_refs,        \
 416                   ".objc_message_refs", 1)      \
 417 SECTION_FUNCTION (objc_selector_fixup_section,  \
 418                   in_objc_selector_fixup,       \
 419                   ".section __OBJC, __sel_fixup", 1)    \
 420 SECTION_FUNCTION (objc_symbols_section,         \
 421                   in_objc_symbols,              \
 422                   ".objc_symbols", 1)   \
 423 SECTION_FUNCTION (objc_module_info_section,     \
 424                   in_objc_module_info,          \
 425                   ".objc_module_info", 1)       \
 426 SECTION_FUNCTION (objc_protocol_section,        \
 427                   in_objc_protocol,             \
 428                   ".objc_protocol", 1)  \
 429 SECTION_FUNCTION (objc_string_object_section,   \
 430                   in_objc_string_object,        \
 431                   ".objc_string_object", 1)     \
 432 SECTION_FUNCTION (objc_constant_string_object_section,  \
 433                   in_objc_constant_string_object,       \
 434                   ".section __OBJC, __cstring_object", 1)       \
 435 SECTION_FUNCTION (objc_class_names_section,     \
 436                 in_objc_class_names,            \
 437                 ".objc_class_names", 1) \
 438 SECTION_FUNCTION (objc_meth_var_names_section,  \
 439                 in_objc_meth_var_names,         \
 440                 ".objc_meth_var_names", 1)      \
 441 SECTION_FUNCTION (objc_meth_var_types_section,  \
 442                 in_objc_meth_var_types,         \
 443                 ".objc_meth_var_types", 1)      \
 444 SECTION_FUNCTION (objc_cls_refs_section,        \
 445                 in_objc_cls_refs,               \
 446                 ".objc_cls_refs", 1)            \
 447                                                 \
 448 SECTION_FUNCTION (machopic_lazy_symbol_ptr_section,     \
 449                 in_machopic_lazy_symbol_ptr,            \
 450                 ".lazy_symbol_pointer", 0)              \
 451 SECTION_FUNCTION (machopic_nl_symbol_ptr_section,       \
 452                 in_machopic_nl_symbol_ptr,              \
 453                 ".non_lazy_symbol_pointer", 0)          \
 454 SECTION_FUNCTION (machopic_symbol_stub_section,         \
 455                 in_machopic_symbol_stub,                \
 456                 ".symbol_stub", 0)                      \
 457 SECTION_FUNCTION (machopic_picsymbol_stub_section,      \
 458                 in_machopic_picsymbol_stub,             \
 459                 ".picsymbol_stub", 0)                   \
 460 SECTION_FUNCTION (darwin_exception_section,             \
 461                 in_darwin_exception,                    \
 462                 ".section __TEXT,__gcc_except_tab", 0)  \
 463                                                         \
 464 void                                            \
 465 objc_section_init ()                            \
 466 {                                               \
 467   static int been_here = 0;                     \
 468                                                 \
 469   if (been_here == 0)                           \
 470     {                                           \
 471       been_here = 1;                            \
 472           /* written, cold -> hot */            \
 473       objc_cat_cls_meth_section ();             \
 474       objc_cat_inst_meth_section ();            \
 475       objc_string_object_section ();            \
 476       objc_constant_string_object_section ();   \
 477       objc_selector_refs_section ();            \
 478       objc_selector_fixup_section ();           \
 479       objc_cls_refs_section ();                 \
 480       objc_class_section ();                    \
 481       objc_meta_class_section ();               \
 482           /* shared, hot -> cold */             \
 483       objc_cls_meth_section ();                 \
 484       objc_inst_meth_section ();                \
 485       objc_protocol_section ();                 \
 486       objc_class_names_section ();              \
 487       objc_meth_var_types_section ();           \
 488       objc_meth_var_names_section ();           \
 489       objc_category_section ();                 \
 490       objc_class_vars_section ();               \
 491       objc_instance_vars_section ();            \
 492       objc_module_info_section ();              \
 493       objc_symbols_section ();                  \
 494     }                                           \
 495 }                                               \
 496 static tree section_alias[(int) num_sections];  \
 497 void try_section_alias ()                       \
 498 {                                               \
 499     if (section_alias[in_section] && asm_out_file) \
 500       fprintf (asm_out_file, "%s\n",            \
 501                IDENTIFIER_POINTER (section_alias[in_section])); \
 502 }                                               \
 503 void alias_section (name, alias)                        \
 504      char *name, *alias;                                \
 505 {                                                       \
 506     ALIAS_SECTION (in_data, "data");                    \
 507     ALIAS_SECTION (in_text, "text");                    \
 508     ALIAS_SECTION (in_const, "const");                  \
 509     ALIAS_SECTION (in_const_data, "const_data");        \
 510     ALIAS_SECTION (in_cstring, "cstring");              \
 511     ALIAS_SECTION (in_literal4, "literal4");            \
 512     ALIAS_SECTION (in_literal8, "literal8");            \
 513 }
 514
 515 #undef  READONLY_DATA_SECTION
 516 #define READONLY_DATA_SECTION const_section
 517
 518 #undef  SELECT_SECTION
 519 #define SELECT_SECTION(exp,reloc,align)                         \
 520   do                                                            \
 521     {                                                           \
 522       if (TREE_CODE (exp) == STRING_CST)                        \
 523         {                                                       \
 524           if (flag_writable_strings)                            \
 525             data_section ();                                    \
 526           else if (TREE_STRING_LENGTH (exp) !=                  \
 527                    strlen (TREE_STRING_POINTER (exp)) + 1)      \
 528             readonly_data_section ();                           \
 529           else                                                  \
 530             cstring_section ();                                 \
 531         }                                                       \
 532       else if (TREE_CODE (exp) == INTEGER_CST                   \
 533                || TREE_CODE (exp) == REAL_CST)                  \
 534         {                                                       \
 535           tree size = TYPE_SIZE (TREE_TYPE (exp));              \
 536                                                                 \
 537           if (TREE_CODE (size) == INTEGER_CST &&                \
 538               TREE_INT_CST_LOW (size) == 4 &&                   \
 539               TREE_INT_CST_HIGH (size) == 0)                    \
 540             literal4_section ();                                \
 541           else if (TREE_CODE (size) == INTEGER_CST &&           \
 542               TREE_INT_CST_LOW (size) == 8 &&                   \
 543               TREE_INT_CST_HIGH (size) == 0)                    \
 544             literal8_section ();                                \
 545           else                                                  \
 546             readonly_data_section ();                           \
 547         }                                                       \
 548       else if (TREE_CODE (exp) == CONSTRUCTOR                           \
 549                && TREE_TYPE (exp)                                       \
 550                && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE            \
 551                && TYPE_NAME (TREE_TYPE (exp)))                          \
 552         {                                                               \
 553           tree name = TYPE_NAME (TREE_TYPE (exp));                      \
 554           if (TREE_CODE (name) == TYPE_DECL)                            \
 555             name = DECL_NAME (name);                                    \
 556           if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString"))  \
 557             objc_constant_string_object_section ();                     \
 558           else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString")) \
 559             objc_string_object_section ();                              \
 560           else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))          \
 561             {                                                           \
 562               if (TREE_SIDE_EFFECTS (exp) || flag_pic && reloc)         \
 563                 const_data_section ();                                  \
 564               else                                                      \
 565                 readonly_data_section ();                               \
 566             }                                                           \
 567           else                                                          \
 568             data_section ();                                            \
 569       }                                                                 \
 570       else if (TREE_CODE (exp) == VAR_DECL &&                           \
 571                DECL_NAME (exp) &&                                       \
 572                TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE &&        \
 573                IDENTIFIER_POINTER (DECL_NAME (exp)) &&                  \
 574                !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6)) \
 575         {                                                               \
 576           const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));      \
 577                                                                         \
 578           if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))              \
 579             objc_cls_meth_section ();                                   \
 580           else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))      \
 581             objc_inst_meth_section ();                                  \
 582           else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20)) \
 583             objc_cat_cls_meth_section ();                               \
 584           else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23)) \
 585             objc_cat_inst_meth_section ();                              \
 586           else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))       \
 587             objc_class_vars_section ();                                 \
 588           else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))    \
 589             objc_instance_vars_section ();                              \
 590           else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))       \
 591             objc_cat_cls_meth_section ();                               \
 592           else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))            \
 593             objc_class_names_section ();                                \
 594           else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))         \
 595             objc_meth_var_names_section ();                             \
 596           else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))         \
 597             objc_meth_var_types_section ();                             \
 598           else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))       \
 599             objc_cls_refs_section ();                                   \
 600           else if (!strncmp (name, "_OBJC_CLASS_", 12))                 \
 601             objc_class_section ();                                      \
 602           else if (!strncmp (name, "_OBJC_METACLASS_", 16))             \
 603             objc_meta_class_section ();                                 \
 604           else if (!strncmp (name, "_OBJC_CATEGORY_", 15))              \
 605             objc_category_section ();                                   \
 606           else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))    \
 607             objc_selector_refs_section ();                              \
 608           else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))         \
 609             objc_selector_fixup_section ();                             \
 610           else if (!strncmp (name, "_OBJC_SYMBOLS", 13))                \
 611             objc_symbols_section ();                                    \
 612           else if (!strncmp (name, "_OBJC_MODULES", 13))                \
 613             objc_module_info_section ();                                \
 614           else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32)) \
 615             objc_cat_inst_meth_section ();                              \
 616           else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29)) \
 617             objc_cat_cls_meth_section ();                               \
 618           else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))         \
 619             objc_cat_cls_meth_section ();                               \
 620           else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))              \
 621             objc_protocol_section ();                                   \
 622           else if ((TREE_READONLY (exp) || TREE_CONSTANT (exp))         \
 623                 && !TREE_SIDE_EFFECTS (exp))                            \
 624              { if (flag_pic && reloc ) const_data_section ();             \
 625                else readonly_data_section (); }                         \
 626           else                                                          \
 627             data_section ();                                            \
 628         }                                                               \
 629       else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))              \
 630         {                                                               \
 631           if (TREE_SIDE_EFFECTS (exp) || flag_pic && reloc)             \
 632             const_data_section ();                                      \
 633           else                                                          \
 634             readonly_data_section ();                                   \
 635         }                                                               \
 636       else                                                              \
 637         data_section ();                                                \
 638       try_section_alias ();                                             \
 639     }                                                                   \
 640   while (0)
 641
 642 #undef  SELECT_RTX_SECTION
 643 #define SELECT_RTX_SECTION(mode, rtx, align)                            \
 644   do                                                                    \
 645     {                                                                   \
 646       if (GET_MODE_SIZE (mode) == 8)                                    \
 647         literal8_section ();                                            \
 648       else if (GET_MODE_SIZE (mode) == 4)                               \
 649         literal4_section ();                                            \
 650       else                                                              \
 651         const_section ();                                               \
 652     }                                                                   \
 653   while (0)
 654
 655 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 656     do {                                                                \
 657          if (FILE) {                                                    \
 658            if (flag_pic)                                                \
 659              fprintf (FILE, "\t.lazy_reference ");                      \
 660            else                                                         \
 661              fprintf (FILE, "\t.reference ");                           \
 662            assemble_name (FILE, NAME);                                  \
 663            fprintf (FILE, "\n");                                        \
 664          }                                                              \
 665        } while (0)
 666
 667 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 668     do {                                                                \
 669          if (FILE) {                                                    \
 670            fprintf (FILE, "\t");                                        \
 671            assemble_name (FILE, NAME);                                  \
 672            fprintf (FILE, "=0\n");                                      \
 673            assemble_global (NAME);                                      \
 674          }                                                              \
 675        } while (0)
 676
 677 #undef ASM_GLOBALIZE_LABEL
 678 #define ASM_GLOBALIZE_LABEL(FILE,NAME)  \
 679  do { const char *const _x = (NAME); if (!!strncmp (_x, "_OBJC_", 6)) { \
 680   (fputs (".globl ", FILE), assemble_name (FILE, _x), fputs ("\n", FILE)); \
 681  }} while (0)
 682
 683 #undef ASM_GENERATE_INTERNAL_LABEL
 684 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 685   sprintf (LABEL, "*%s%d", PREFIX, NUM)
 686
 687 /* This is how to output an internal numbered label where PREFIX is
 688    the class of label and NUM is the number within the class.  */
 689
 690 #undef ASM_OUTPUT_INTERNAL_LABEL
 691 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)      \
 692   fprintf (FILE, "%s%d:\n", PREFIX, NUM)
 693
 694 /* Since we have a separate readonly data section, define this so that
 695    jump tables end up in text rather than data.  */
 696
 697 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 698 #define JUMP_TABLES_IN_TEXT_SECTION 1
 699 #endif
 700
 701 /* Symbolic names for various things we might know about a symbol.  */
 702
 703 enum machopic_addr_class {
 704   MACHOPIC_UNDEFINED,
 705   MACHOPIC_DEFINED_DATA,
 706   MACHOPIC_UNDEFINED_DATA,
 707   MACHOPIC_DEFINED_FUNCTION,
 708   MACHOPIC_UNDEFINED_FUNCTION
 709 };
 710
 711 /* Macros defining the various PIC cases.  */
 712
 713 #define MACHOPIC_INDIRECT      (flag_pic)
 714 #define MACHOPIC_JUST_INDIRECT (flag_pic == 1)
 715 #define MACHOPIC_PURE          (flag_pic == 2)
 716
 717 #define ENCODE_SECTION_INFO(DECL)  \
 718   darwin_encode_section_info (DECL)
 719
 720 /* Be conservative and always redo the encoding.  */
 721
 722 #define REDO_SECTION_INFO_P(DECL) (1)
 723
 724 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME)  \
 725   ((VAR) = ((SYMBOL_NAME[0] == '!') ? (SYMBOL_NAME) + 4 : (SYMBOL_NAME)))
 726
 727 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 728   do {                                                          \
 729     const char *const stub_ = (STUB);                           \
 730     char *buffer_ = (BUF);                                      \
 731     strcpy (buffer_, stub_);                                    \
 732     if (stub_[0] == '"')                                        \
 733       {                                                         \
 734         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 735       }                                                         \
 736     else                                                        \
 737       {                                                         \
 738         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 739       }                                                         \
 740   } while (0)
 741
 742 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 743   do {                                                          \
 744     const char *const symbol_ = (SYMBOL);                       \
 745     char *buffer_ = (BUF);                                      \
 746     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 747       {                                                         \
 748           sprintf (buffer_, "\"%s\"", symbol_);                 \
 749       }                                                         \
 750     else                                                        \
 751       {                                                         \
 752         strcpy (buffer_, symbol_);                              \
 753       }                                                         \
 754   } while (0)
 755
 756 /* Given a symbol name string, create the lazy pointer version
 757    of the symbol name.  */
 758
 759 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 760   do {                                                          \
 761     const char *symbol_ = (SYMBOL);                             \
 762     char *buffer_ = (BUF);                                      \
 763     STRIP_NAME_ENCODING (symbol_, symbol_);  \
 764     if (symbol_[0] == '"')                                      \
 765       {                                                         \
 766         strcpy (buffer_, "\"L");                                        \
 767         strcpy (buffer_ + 2, symbol_ + 1);                      \
 768         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 769       }                                                         \
 770     else if (name_needs_quotes (symbol_))                       \
 771       {                                                         \
 772         strcpy (buffer_, "\"L");                                \
 773         strcpy (buffer_ + 2, symbol_);                          \
 774         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 775       }                                                         \
 776     else                                                        \
 777       {                                                         \
 778         strcpy (buffer_, "L");                                  \
 779         strcpy (buffer_ + 1, symbol_);                          \
 780         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 781       }                                                         \
 782   } while (0)
 783
 784 #define EXCEPTION_SECTION() darwin_exception_section ()
 785
 786 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 787   (((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 788
 789 #define REGISTER_TARGET_PRAGMAS(PFILE)                          \
 790   do {                                                          \
 791     cpp_register_pragma (PFILE, 0, "mark", darwin_pragma_ignore);  \
 792     cpp_register_pragma (PFILE, 0, "options", darwin_pragma_options);  \
 793     cpp_register_pragma (PFILE, 0, "segment", darwin_pragma_ignore);  \
 794     cpp_register_pragma (PFILE, 0, "unused", darwin_pragma_unused);  \
 795   } while (0)