gcc/config/darwin.h

   1 /* Target definitions for Darwin (Mac OS X) systems.
   2    Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
   3    2005
   4    Free Software Foundation, Inc.
   5    Contributed by Apple Computer Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  22 Boston, MA 02110-1301, USA.  */
  23
  24 #ifndef CONFIG_DARWIN_H
  25 #define CONFIG_DARWIN_H
  26
  27 /* The definitions in this file are common to all processor types
  28    running Darwin, which is the kernel for Mac OS X.  Darwin is
  29    basically a BSD user layer laid over a Mach kernel, then evolved
  30    for many years (at NeXT) in parallel with other Unix systems.  So
  31    while the runtime is a somewhat idiosyncratic Mach-based thing,
  32    other definitions look like they would for a BSD variant.  */
  33
  34 /* Although NeXT ran on many different architectures, as of Jan 2001
  35    the only supported Darwin targets are PowerPC and x86.  */
  36
  37 /* One of Darwin's NeXT legacies is the Mach-O format, which is partly
  38    like a.out and partly like COFF, with additional features like
  39    multi-architecture binary support.  */
  40
  41 #define OBJECT_FORMAT_MACHO
  42
  43 /* Suppress g++ attempt to link in the math library automatically. */
  44 #define MATH_LIBRARY ""
  45
  46 /* We have atexit.  */
  47
  48 #define HAVE_ATEXIT
  49
  50 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
  51
  52 #define DO_GLOBAL_DTORS_BODY
  53
  54 /* The string value for __SIZE_TYPE__.  */
  55
  56 #ifndef SIZE_TYPE
  57 #define SIZE_TYPE "long unsigned int"
  58 #endif
  59
  60 /* Type used for ptrdiff_t, as a string used in a declaration.  */
  61
  62 #undef  PTRDIFF_TYPE
  63 #define PTRDIFF_TYPE "int"
  64
  65 /* wchar_t is int.  */
  66
  67 #undef  WCHAR_TYPE
  68 #define WCHAR_TYPE "int"
  69 #undef  WCHAR_TYPE_SIZE
  70 #define WCHAR_TYPE_SIZE 32
  71
  72 /* Default to using the NeXT-style runtime, since that's what is
  73    pre-installed on Darwin systems.  */
  74
  75 #define NEXT_OBJC_RUNTIME
  76
  77 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  78    we want to retain compatibility with older gcc versions.  */
  79
  80 #undef  DEFAULT_PCC_STRUCT_RETURN
  81 #define DEFAULT_PCC_STRUCT_RETURN 0
  82
  83 /* This table intercepts weirdo options whose names would interfere
  84    with normal driver conventions, and either translates them into
  85    standardly-named options, or adds a 'Z' so that they can get to
  86    specs processing without interference.
  87
  88    Do not expand a linker option to "-Xlinker -<option>", since that
  89    forfeits the ability to control via spec strings later.  However,
  90    as a special exception, do this translation with -filelist, because
  91    otherwise the driver will think there are no input files and quit.
  92    (The alternative would be to hack the driver to recognize -filelist
  93    specially, but it's simpler to use the translation table.)
  94
  95    Note that an option name with a prefix that matches another option
  96    name, that also takes an argument, needs to be modified so the
  97    prefix is different, otherwise a '*' after the shorter option will
  98    match with the longer one.
  99
 100    The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined
 101    in gcc/config/{i386,rs6000}/darwin.h, should contain any additional
 102    command-line option translations specific to the particular target
 103    architecture.  */
 104
 105 #define TARGET_OPTION_TRANSLATE_TABLE \
 106   { "-all_load", "-Zall_load" },  \
 107   { "-allowable_client", "-Zallowable_client" },  \
 108   { "-arch_errors_fatal", "-Zarch_errors_fatal" },  \
 109   { "-bind_at_load", "-Zbind_at_load" },  \
 110   { "-bundle", "-Zbundle" },  \
 111   { "-bundle_loader", "-Zbundle_loader" },  \
 112   { "-weak_reference_mismatches", "-Zweak_reference_mismatches" },  \
 113   { "-dead_strip", "-Zdead_strip" }, \
 114   { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \
 115   { "-dependency-file", "-MF" }, \
 116   { "-dylib_file", "-Zdylib_file" }, \
 117   { "-dynamic", "-Zdynamic" },  \
 118   { "-dynamiclib", "-Zdynamiclib" },  \
 119   { "-exported_symbols_list", "-Zexported_symbols_list" },  \
 120   { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \
 121   { "-gused", "-g -feliminate-unused-debug-symbols" }, \
 122   { "-segaddr", "-Zsegaddr" }, \
 123   { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \
 124   { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \
 125   { "-seg_addr_table", "-Zseg_addr_table" }, \
 126   { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \
 127   { "-filelist", "-Xlinker -filelist -Xlinker" },  \
 128   { "-framework", "-Xlinker -framework -Xlinker" },  \
 129   { "-flat_namespace", "-Zflat_namespace" },  \
 130   { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
 131   { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
 132   { "-image_base", "-Zimage_base" },  \
 133   { "-init", "-Zinit" },  \
 134   { "-install_name", "-Zinstall_name" },  \
 135   { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
 136   { "-multiply_defined", "-Zmultiply_defined" },  \
 137   { "-multi_module", "-Zmulti_module" },  \
 138   { "-static", "-static -Wa,-static" },  \
 139   { "-single_module", "-Zsingle_module" },  \
 140   { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
 141   SUBTARGET_OPTION_TRANSLATE_TABLE
 142
 143 /* These compiler options take n arguments.  */
 144
 145 #undef  WORD_SWITCH_TAKES_ARG
 146 #define WORD_SWITCH_TAKES_ARG(STR)              \
 147   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
 148    !strcmp (STR, "Zallowable_client") ? 1 :     \
 149    !strcmp (STR, "arch") ? 1 :                  \
 150    !strcmp (STR, "arch_only") ? 1 :             \
 151    !strcmp (STR, "Zbundle_loader") ? 1 :        \
 152    !strcmp (STR, "client_name") ? 1 :           \
 153    !strcmp (STR, "compatibility_version") ? 1 : \
 154    !strcmp (STR, "current_version") ? 1 :       \
 155    !strcmp (STR, "Zdylib_file") ? 1 :           \
 156    !strcmp (STR, "Zexported_symbols_list") ? 1 : \
 157    !strcmp (STR, "Zimage_base") ? 1 :           \
 158    !strcmp (STR, "Zinit") ? 1 :                 \
 159    !strcmp (STR, "Zinstall_name") ? 1 :         \
 160    !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
 161    !strcmp (STR, "Zmultiply_defined") ? 1 :     \
 162    !strcmp (STR, "precomp-trustfile") ? 1 :     \
 163    !strcmp (STR, "read_only_relocs") ? 1 :      \
 164    !strcmp (STR, "sectcreate") ? 3 :            \
 165    !strcmp (STR, "sectorder") ? 3 :             \
 166    !strcmp (STR, "Zsegaddr") ? 2 :              \
 167    !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
 168    !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
 169    !strcmp (STR, "Zseg_addr_table") ? 1 :       \
 170    !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
 171    !strcmp (STR, "seg1addr") ? 1 :              \
 172    !strcmp (STR, "segprot") ? 3 :               \
 173    !strcmp (STR, "sub_library") ? 1 :           \
 174    !strcmp (STR, "sub_umbrella") ? 1 :          \
 175    !strcmp (STR, "umbrella") ? 1 :              \
 176    !strcmp (STR, "undefined") ? 1 :             \
 177    !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
 178    !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
 179    !strcmp (STR, "pagezero_size") ? 1 :         \
 180    !strcmp (STR, "segs_read_only_addr") ? 1 :   \
 181    !strcmp (STR, "segs_read_write_addr") ? 1 :  \
 182    !strcmp (STR, "sectalign") ? 3 :             \
 183    !strcmp (STR, "sectobjectsymbols") ? 2 :     \
 184    !strcmp (STR, "segcreate") ? 3 :             \
 185    !strcmp (STR, "dylinker_install_name") ? 1 : \
 186    0)
 187
 188 /* Machine dependent cpp options.  Don't add more options here, add
 189    them to darwin_cpp_builtins in darwin-c.c.  */
 190
 191 #undef  CPP_SPEC
 192 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}"
 193
 194 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
 195    precomp, libtool, and fat build additions.  Also we
 196    don't specify a second %G after %L because libSystem is
 197    self-contained and doesn't need to link against libgcc.a.  */
 198 /* In general, random Darwin linker flags should go into LINK_SPEC
 199    instead of LINK_COMMAND_SPEC.  The command spec is better for
 200    specifying the handling of options understood by generic Unix
 201    linkers, and for positional arguments like libraries.  */
 202 #define LINK_COMMAND_SPEC "\
 203 %{!fdump=*:%{!fsyntax-only:%{!precomp:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 204     %{!Zdynamiclib:%(linker)}%{Zdynamiclib:/usr/bin/libtool} \
 205     %l %X %{d} %{s} %{t} %{Z} \
 206     %{!Zdynamiclib:%{A} %{e*} %{m} %{N} %{n} %{r} %{u*} %{x} %{z}} \
 207     %{@:-o %f%u.out}%{!@:%{o*}%{!o:-o a.out}} \
 208     %{!Zdynamiclib:%{!A:%{!nostdlib:%{!nostartfiles:%S}}}} \
 209     %{L*} %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
 210     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
 211     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}}"
 212
 213 /* Please keep the random linker options in alphabetical order (modulo
 214    'Z' and 'no' prefixes).  Options that can only go to one of libtool
 215    or ld must be listed twice, under both !Zdynamiclib and
 216    Zdynamiclib, with one of the cases reporting an error.  */
 217 /* Note that options taking arguments may appear multiple times on a
 218    command line with different arguments each time, so put a * after
 219    their names so all of them get passed.  */
 220 #define LINK_SPEC  \
 221   "%{static}%{!static:-dynamic} \
 222    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
 223    %{!Zdynamiclib: \
 224      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 225      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 226      %{Zbundle:-bundle} \
 227      %{Zbundle_loader*:-bundle_loader %*} \
 228      %{client_name*} \
 229      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 230 } \
 231      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 232      %{Zforce_flat_namespace:-force_flat_namespace} \
 233      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 234      %{keep_private_externs} \
 235      %{private_bundle} \
 236     } \
 237    %{Zdynamiclib: \
 238      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 239      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 240      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 241      %{compatibility_version*} \
 242      %{current_version*} \
 243      %{Zforce_cpusubtype_ALL:-arch_only %(darwin_arch)} \
 244      %{!Zforce_cpusubtype_ALL: -arch_only %(darwin_subarch)} \
 245      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 246      %{Zinstall_name*:-install_name %*} \
 247      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 248      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 249     } \
 250    %{Zall_load:-all_load}%{Zdynamiclib:%{!Zall_load:-noall_load}} \
 251    %{Zallowable_client*:-allowable_client %*} \
 252    %{Zbind_at_load:-bind_at_load} \
 253    %{Zarch_errors_fatal:-arch_errors_fatal} \
 254    %{Zdead_strip:-dead_strip} \
 255    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 256    %{Zdylib_file*:-dylib_file %*} \
 257    %{Zdynamic:-dynamic}\
 258    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 259    %{Zflat_namespace:-flat_namespace} \
 260    %{headerpad_max_install_names*} \
 261    %{Zimage_base*:-image_base %*} \
 262    %{Zinit*:-init %*} \
 263    %{mmacosx-version-min=*:-macosx_version_min %*} \
 264    %{nomultidefs} \
 265    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 266    %{Zmultiply_defined*:-multiply_defined %*} \
 267    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 268    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 269    %{read_only_relocs} \
 270    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 271    %{Zsegaddr*:-segaddr %*} \
 272    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 273    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 274    %{Zseg_addr_table*: -seg_addr_table %*} \
 275    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 276    %{sub_library*} %{sub_umbrella*} \
 277    %{isysroot*:-syslibroot %*} \
 278    %{twolevel_namespace} %{twolevel_namespace_hints} \
 279    %{umbrella*} \
 280    %{undefined*} \
 281    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 282    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 283    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 284    %{X} \
 285    %{y*} \
 286    %{w} \
 287    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 288    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 289    %{whatsloaded} %{dylinker_install_name*} \
 290    %{dylinker} %{Mach} "
 291
 292
 293 /* Machine dependent libraries.  */
 294
 295 #define LIB_SPEC "%{!static:-lSystem}"
 296
 297 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 298    libraries to link against, and by not linking against libgcc_s on
 299    earlier-than-10.3.9.
 300
 301    Note that by default, -lgcc_eh is not linked against!  This is
 302    because in a future version of Darwin the EH frame information may
 303    be in a new format, or the fallback routine might be changed; if
 304    you want to explicitly link against the static version of those
 305    routines, because you know you don't need to unwind through system
 306    libraries, you need to explicitly say -static-libgcc.
 307
 308    If it is linked against, it has to be before -lgcc, because it may
 309    need symbols from -lgcc.  */
 310 #undef REAL_LIBGCC_SPEC
 311 #define REAL_LIBGCC_SPEC                                                   \
 312    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 313       shared-libgcc|fexceptions:                                           \
 314        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 315        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 316        -lgcc;                                                              \
 317       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 318        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 319        -lgcc}"
 320
 321 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.  */
 322
 323 #undef  STARTFILE_SPEC
 324 #define STARTFILE_SPEC  \
 325   "%{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}} \
 326      %{!Zbundle:%{pg:%{static:-lgcrt0.o} \
 327                      %{!static:%{object:-lgcrt0.o} \
 328                                %{!object:%{preload:-lgcrt0.o} \
 329                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}} \
 330                 %{!pg:%{static:-lcrt0.o} \
 331                       %{!static:%{object:-lcrt0.o} \
 332                                 %{!object:%{preload:-lcrt0.o} \
 333                                   %{!preload:-lcrt1.o %(darwin_crt2)}}}}}}"
 334
 335 /* The native Darwin linker doesn't necessarily place files in the order
 336    that they're specified on the link line.  Thus, it is pointless
 337    to put anything in ENDFILE_SPEC.  */
 338 /* #define ENDFILE_SPEC "" */
 339
 340 /* Default Darwin ASM_SPEC, very simple.  */
 341 #define ASM_SPEC "-arch %(darwin_arch) \
 342   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
 343
 344 /* We use Dbx symbol format.  */
 345
 346 #define DBX_DEBUGGING_INFO 1
 347
 348 /* Also enable Dwarf 2 as an option.  */
 349 #define DWARF2_DEBUGGING_INFO
 350 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 351
 352 #define DEBUG_FRAME_SECTION   "__DWARFA,__debug_frame,coalesced,no_toc+strip_static_syms"
 353 #define DEBUG_INFO_SECTION    "__DWARFA,__debug_info"
 354 #define DEBUG_ABBREV_SECTION  "__DWARFA,__debug_abbrev"
 355 #define DEBUG_ARANGES_SECTION "__DWARFA,__debug_aranges"
 356 #define DEBUG_MACINFO_SECTION "__DWARFA,__debug_macinfo"
 357 #define DEBUG_LINE_SECTION    "__DWARFA,__debug_line"
 358 #define DEBUG_LOC_SECTION     "__DWARFA,__debug_loc"
 359 #define DEBUG_PUBNAMES_SECTION        "__DWARFA,__debug_pubnames"
 360 #define DEBUG_STR_SECTION     "__DWARFA,__debug_str"
 361 #define DEBUG_RANGES_SECTION  "__DWARFA,__debug_ranges"
 362
 363 /* When generating stabs debugging, use N_BINCL entries.  */
 364
 365 #define DBX_USE_BINCL
 366
 367 /* There is no limit to the length of stabs strings.  */
 368
 369 #define DBX_CONTIN_LENGTH 0
 370
 371 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 372
 373 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 374
 375 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 376 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 377
 378 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 379    sections.  machopic_select_section ensures that weak variables go in
 380    coalesced sections.  Weak aliases (or any other kind of aliases) are
 381    not supported.  Weak symbols that aren't visible outside the .s file
 382    are not supported.  */
 383 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 384   do {                                                                  \
 385     if (ALIAS)                                                          \
 386       {                                                                 \
 387         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 388         break;                                                          \
 389       }                                                                 \
 390                                                                         \
 391     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 392       targetm.asm_out.globalize_label (FILE, NAME);                     \
 393     if (DECL_EXTERNAL (DECL))                                           \
 394       fputs ("\t.weak_reference ", FILE);                               \
 395     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
 396         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
 397       break;                                                            \
 398     else if (TREE_PUBLIC (DECL))                                        \
 399       fputs ("\t.weak_definition ", FILE);                              \
 400     else                                                                \
 401       break;                                                            \
 402     assemble_name (FILE, NAME);                                         \
 403     fputc ('\n', FILE);                                                 \
 404   } while (0)
 405
 406 /* Darwin has the pthread routines in libSystem, which every program
 407    links to, so there's no need for weak-ness for that.  */
 408 #define GTHREAD_USE_WEAK 0
 409
 410 /* The Darwin linker imposes two limitations on common symbols: they
 411    can't have hidden visibility, and they can't appear in dylibs.  As
 412    a consequence, we should never use common symbols to represent
 413    vague linkage. */
 414 #undef USE_COMMON_FOR_ONE_ONLY
 415 #define USE_COMMON_FOR_ONE_ONLY 0
 416
 417 /* The Darwin linker doesn't want coalesced symbols to appear in
 418    a static archive's table of contents. */
 419 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 420 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 421
 422 /* On Darwin, we don't (at the time of writing) have linkonce sections
 423    with names, so it's safe to make the class data not comdat.  */
 424 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 425
 426 /* We make exception information linkonce. */
 427 #undef TARGET_USES_WEAK_UNWIND_INFO
 428 #define TARGET_USES_WEAK_UNWIND_INFO 1
 429
 430 /* We need to use a nonlocal label for the start of an EH frame: the
 431    Darwin linker requires that a coalesced section start with a label. */
 432 #undef FRAME_BEGIN_LABEL
 433 #define FRAME_BEGIN_LABEL "EH_frame"
 434
 435 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 436    emit a label for an empty FDE. */
 437 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 438
 439 /* Emit a label to separate the exception table.  */
 440 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 441
 442 /* Our profiling scheme doesn't LP labels and counter words.  */
 443
 444 #define NO_PROFILE_COUNTERS     1
 445
 446 #undef  INIT_SECTION_ASM_OP
 447 #define INIT_SECTION_ASM_OP
 448
 449 #undef  INVOKE__main
 450
 451 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 452 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 453
 454 /* Always prefix with an underscore.  */
 455
 456 #define USER_LABEL_PREFIX "_"
 457
 458 /* Don't output a .file directive.  That is only used by the assembler for
 459    error reporting.  */
 460 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 461 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 462
 463 #undef  TARGET_ASM_FILE_END
 464 #define TARGET_ASM_FILE_END darwin_file_end
 465
 466 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 467   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 468
 469 /* Give ObjC methods pretty symbol names.  */
 470
 471 #undef  OBJC_GEN_METHOD_LABEL
 472 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 473   do { if (CAT_NAME)                                                    \
 474          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 475                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 476        else                                                             \
 477          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 478                   (CLASS_NAME), (SEL_NAME));                            \
 479      } while (0)
 480
 481 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 482    but it does need to be referenced via indirect PIC data pointers.
 483    The machopic_define_symbol calls are telling the machopic subsystem
 484    that the name *is* defined in this module, so it doesn't need to
 485    make them indirect.  */
 486
 487 #undef ASM_DECLARE_OBJECT_NAME
 488 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 489   do {                                                                  \
 490     const char *xname = NAME;                                           \
 491     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 492       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 493     if (! DECL_WEAK (DECL)                                              \
 494         && ((TREE_STATIC (DECL)                                         \
 495              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 496             || DECL_INITIAL (DECL)))                                    \
 497         machopic_define_symbol (DECL_RTL (DECL));                       \
 498     if ((TREE_STATIC (DECL)                                             \
 499          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 500         || DECL_INITIAL (DECL))                                         \
 501       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 502     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 503     /* Darwin doesn't support zero-size objects, so give them a         \
 504        byte.  */                                                        \
 505     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
 506       assemble_zeros (1);                                               \
 507   } while (0)
 508
 509 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 510   do {                                                                  \
 511     const char *xname = NAME;                                           \
 512     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 513       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 514     if (! DECL_WEAK (DECL)                                              \
 515         && ((TREE_STATIC (DECL)                                         \
 516              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 517             || DECL_INITIAL (DECL)))                                    \
 518         machopic_define_symbol (DECL_RTL (DECL));                       \
 519     if ((TREE_STATIC (DECL)                                             \
 520          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 521         || DECL_INITIAL (DECL))                                         \
 522       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 523     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 524   } while (0)
 525
 526 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
 527   do {                                                          \
 528     ASM_OUTPUT_LABEL (FILE, NAME);                              \
 529     /* Darwin doesn't support zero-size objects, so give them a \
 530        byte.  */                                                \
 531     if ((SIZE) == 0)                                            \
 532       assemble_zeros (1);                                       \
 533   } while (0)
 534
 535 /* Wrap new method names in quotes so the assembler doesn't gag.
 536    Make Objective-C internal symbols local.  */
 537
 538 #undef  ASM_OUTPUT_LABELREF
 539 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 540   do {                                                                       \
 541        const char *xname = (NAME);                                           \
 542        if (! strcmp (xname, "<pic base>"))                                   \
 543          machopic_output_function_base_name(FILE);                           \
 544        else if (xname[0] == '&' || xname[0] == '*')                          \
 545          {                                                                   \
 546            int len = strlen (xname);                                         \
 547            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 548              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 549            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 550              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 551            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 552              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 553            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 554              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 555            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 556              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 557            else                                                              \
 558              fputs (&xname[1], FILE);                                        \
 559          }                                                                   \
 560        else if (xname[0] == '+' || xname[0] == '-')                          \
 561          fprintf (FILE, "\"%s\"", xname);                                    \
 562        else if (!strncmp (xname, "_OBJC_", 6))                               \
 563          fprintf (FILE, "L%s", xname);                                       \
 564        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
 565          fprintf (FILE, "%s", xname);                                        \
 566        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 567          fprintf (FILE, "\"%s\"", xname);                                    \
 568        else                                                                  \
 569          asm_fprintf (FILE, "%U%s", xname);                                  \
 570   } while (0)
 571
 572 /* Output before executable code.  */
 573 #undef TEXT_SECTION_ASM_OP
 574 #define TEXT_SECTION_ASM_OP "\t.text"
 575
 576 /* Output before writable data.  */
 577
 578 #undef DATA_SECTION_ASM_OP
 579 #define DATA_SECTION_ASM_OP "\t.data"
 580
 581 #undef  ALIGN_ASM_OP
 582 #define ALIGN_ASM_OP            ".align"
 583
 584 #undef  ASM_OUTPUT_ALIGN
 585 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 586   if ((LOG) != 0)                       \
 587     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
 588
 589 /* Ensure correct alignment of bss data.  */
 590
 591 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 592 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 593   do {                                                                  \
 594     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 595     fputs (".lcomm ", (FILE));                                          \
 596     assemble_name ((FILE), (NAME));                                     \
 597     if (_new_size == 0) _new_size = 1;                                  \
 598     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
 599              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
 600     if ((DECL) && ((TREE_STATIC (DECL)                                  \
 601          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 602         || DECL_INITIAL (DECL)))                                        \
 603       {                                                                 \
 604         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
 605         machopic_define_symbol (DECL_RTL (DECL));                       \
 606       }                                                                 \
 607   } while (0)
 608
 609 /* The maximum alignment which the object file format can support.
 610    For Mach-O, this is 2^15.  */
 611
 612 #undef  MAX_OFILE_ALIGNMENT
 613 #define MAX_OFILE_ALIGNMENT 0x8000
 614
 615 /* Declare the section variables.  */
 616 #ifndef USED_FOR_TARGET
 617 enum darwin_section_enum {
 618 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 619 #include "darwin-sections.def"
 620 #undef DEF_SECTION
 621   NUM_DARWIN_SECTIONS
 622 };
 623 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 624 #endif
 625
 626 #undef  TARGET_ASM_SELECT_SECTION
 627 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 628 #define USE_SELECT_SECTION_FOR_FUNCTIONS
 629
 630 #undef  TARGET_ASM_SELECT_RTX_SECTION
 631 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 632 #undef  TARGET_ASM_UNIQUE_SECTION
 633 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 634 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 635 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 636
 637
 638 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 639     do {                                                                \
 640          if (FILE) {                                                    \
 641            if (MACHOPIC_INDIRECT)                                       \
 642              fprintf (FILE, "\t.lazy_reference ");                      \
 643            else                                                         \
 644              fprintf (FILE, "\t.reference ");                           \
 645            assemble_name (FILE, NAME);                                  \
 646            fprintf (FILE, "\n");                                        \
 647          }                                                              \
 648        } while (0)
 649
 650 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 651     do {                                                                \
 652          if (FILE) {                                                    \
 653            fprintf (FILE, "\t");                                        \
 654            assemble_name (FILE, NAME);                                  \
 655            fprintf (FILE, "=0\n");                                      \
 656            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
 657          }                                                              \
 658        } while (0)
 659
 660 /* Globalizing directive for a label.  */
 661 #define GLOBAL_ASM_OP ".globl "
 662 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 663
 664 /* Emit an assembler directive to set visibility for a symbol.  Used
 665    to support visibility attribute and Darwin's private extern
 666    feature.  */
 667 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 668 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 669
 670 /* Extra attributes for Darwin.  */
 671 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 672   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 673   { "weak_import", 0, 0, true, false, false,                                 \
 674     darwin_handle_weak_import_attribute }
 675
 676 #undef ASM_GENERATE_INTERNAL_LABEL
 677 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 678   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 679
 680 #undef TARGET_ASM_MARK_DECL_PRESERVED
 681 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 682
 683 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
 684    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
 685    variable has been defined in this translation unit.  */
 686
 687 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
 688 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 689
 690 /* Set on a symbol to indicate when fix-and-continue style code
 691    generation is being used and the symbol refers to a static symbol
 692    that should be rebound from new instances of a translation unit to
 693    the original instance of the data.  */
 694
 695 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 696
 697 /* Symbolic names for various things we might know about a symbol.  */
 698
 699 enum machopic_addr_class {
 700   MACHOPIC_UNDEFINED,
 701   MACHOPIC_DEFINED_DATA,
 702   MACHOPIC_UNDEFINED_DATA,
 703   MACHOPIC_DEFINED_FUNCTION,
 704   MACHOPIC_UNDEFINED_FUNCTION
 705 };
 706
 707 /* Macros defining the various PIC cases.  */
 708
 709 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
 710 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
 711 #define MACHOPIC_JUST_INDIRECT  (flag_pic == 1 || MACHO_DYNAMIC_NO_PIC_P)
 712 #define MACHOPIC_PURE           (flag_pic == 2 && ! MACHO_DYNAMIC_NO_PIC_P)
 713
 714 #undef TARGET_ENCODE_SECTION_INFO
 715 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 716 #undef TARGET_STRIP_NAME_ENCODING
 717 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 718
 719 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 720   do {                                                          \
 721     const char *const stub_ = (STUB);                           \
 722     char *buffer_ = (BUF);                                      \
 723     strcpy (buffer_, stub_);                                    \
 724     if (stub_[0] == '"')                                        \
 725       {                                                         \
 726         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 727       }                                                         \
 728     else                                                        \
 729       {                                                         \
 730         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 731       }                                                         \
 732   } while (0)
 733
 734 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 735   do {                                                          \
 736     const char *const symbol_ = (SYMBOL);                       \
 737     char *buffer_ = (BUF);                                      \
 738     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 739       {                                                         \
 740           sprintf (buffer_, "\"%s\"", symbol_);                 \
 741       }                                                         \
 742     else                                                        \
 743       {                                                         \
 744         strcpy (buffer_, symbol_);                              \
 745       }                                                         \
 746   } while (0)
 747
 748 /* Given a symbol name string, create the lazy pointer version
 749    of the symbol name.  */
 750
 751 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 752   do {                                                          \
 753     const char *symbol_ = (SYMBOL);                             \
 754     char *buffer_ = (BUF);                                      \
 755     if (symbol_[0] == '"')                                      \
 756       {                                                         \
 757         strcpy (buffer_, "\"L");                                \
 758         strcpy (buffer_ + 2, symbol_ + 1);                      \
 759         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 760       }                                                         \
 761     else if (name_needs_quotes (symbol_))                       \
 762       {                                                         \
 763         strcpy (buffer_, "\"L");                                \
 764         strcpy (buffer_ + 2, symbol_);                          \
 765         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 766       }                                                         \
 767     else                                                        \
 768       {                                                         \
 769         strcpy (buffer_, "L");                                  \
 770         strcpy (buffer_ + 1, symbol_);                          \
 771         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 772       }                                                         \
 773   } while (0)
 774
 775 #define EH_FRAME_SECTION_NAME   "__TEXT"
 776 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
 777
 778 /* Java runtime class list.  */
 779 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 780
 781 #undef ASM_PREFERRED_EH_DATA_FORMAT
 782 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 783   (((CODE) == 2 && (GLOBAL) == 1) \
 784    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
 785      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 786
 787 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
 788   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
 789
 790 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
 791       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
 792         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
 793         goto DONE;                                                                      \
 794       }
 795
 796 /* Experimentally, putting jump tables in text is faster on SPEC.
 797    Also this is needed for correctness for coalesced functions.  */
 798
 799 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 800 #define JUMP_TABLES_IN_TEXT_SECTION 1
 801 #endif
 802
 803 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
 804
 805 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
 806 #undef TARGET_ASM_NAMED_SECTION
 807 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
 808
 809 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
 810   do {                                                          \
 811     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
 812     c_register_pragma (0, "options", darwin_pragma_options);    \
 813     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
 814     c_register_pragma (0, "unused", darwin_pragma_unused);      \
 815   } while (0)
 816
 817 #undef ASM_APP_ON
 818 #define ASM_APP_ON ""
 819 #undef ASM_APP_OFF
 820 #define ASM_APP_OFF ""
 821
 822 void darwin_register_frameworks (const char *, const char *, int);
 823 void darwin_register_objc_includes (const char *, const char *, int);
 824 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
 825 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
 826
 827 void add_framework_path (char *);
 828 #define TARGET_OPTF add_framework_path
 829
 830 #define TARGET_POSIX_IO
 831
 832 /* All new versions of Darwin have C99 functions.  */
 833 #define TARGET_C99_FUNCTIONS 1
 834
 835 #define WINT_TYPE "int"
 836
 837 /* Every program on darwin links against libSystem which contains the pthread
 838    routines, so there's no need to explicitly call out when doing threaded
 839    work.  */
 840 #undef GOMP_SELF_SPECS
 841 #define GOMP_SELF_SPECS ""
 842
 843 #endif /* CONFIG_DARWIN_H */