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 /* Don't assume anything about the header files.  */
  44 #define NO_IMPLICIT_EXTERN_C
  45
  46 /* Suppress g++ attempt to link in the math library automatically. */
  47 #define MATH_LIBRARY ""
  48
  49 /* We have atexit.  */
  50
  51 #define HAVE_ATEXIT
  52
  53 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
  54
  55 #define DO_GLOBAL_DTORS_BODY
  56
  57 /* The string value for __SIZE_TYPE__.  */
  58
  59 #ifndef SIZE_TYPE
  60 #define SIZE_TYPE "long unsigned int"
  61 #endif
  62
  63 /* Type used for ptrdiff_t, as a string used in a declaration.  */
  64
  65 #undef  PTRDIFF_TYPE
  66 #define PTRDIFF_TYPE "int"
  67
  68 /* wchar_t is int.  */
  69
  70 #undef  WCHAR_TYPE
  71 #define WCHAR_TYPE "int"
  72 #undef  WCHAR_TYPE_SIZE
  73 #define WCHAR_TYPE_SIZE 32
  74
  75 /* Default to using the NeXT-style runtime, since that's what is
  76    pre-installed on Darwin systems.  */
  77
  78 #define NEXT_OBJC_RUNTIME
  79
  80 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  81    we want to retain compatibility with older gcc versions.  */
  82
  83 #undef  DEFAULT_PCC_STRUCT_RETURN
  84 #define DEFAULT_PCC_STRUCT_RETURN 0
  85
  86 /* True if pragma ms_struct is in effect.  */
  87 extern GTY(()) int darwin_ms_struct;
  88
  89 /* This table intercepts weirdo options whose names would interfere
  90    with normal driver conventions, and either translates them into
  91    standardly-named options, or adds a 'Z' so that they can get to
  92    specs processing without interference.
  93
  94    Do not expand a linker option to "-Xlinker -<option>", since that
  95    forfeits the ability to control via spec strings later.  However,
  96    as a special exception, do this translation with -filelist, because
  97    otherwise the driver will think there are no input files and quit.
  98    (The alternative would be to hack the driver to recognize -filelist
  99    specially, but it's simpler to use the translation table.)
 100
 101    Note that an option name with a prefix that matches another option
 102    name, that also takes an argument, needs to be modified so the
 103    prefix is different, otherwise a '*' after the shorter option will
 104    match with the longer one.
 105
 106    The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined
 107    in gcc/config/{i386,rs6000}/darwin.h, should contain any additional
 108    command-line option translations specific to the particular target
 109    architecture.  */
 110
 111 #define TARGET_OPTION_TRANSLATE_TABLE \
 112   { "-all_load", "-Zall_load" },  \
 113   { "-allowable_client", "-Zallowable_client" },  \
 114   { "-arch_errors_fatal", "-Zarch_errors_fatal" },  \
 115   { "-bind_at_load", "-Zbind_at_load" },  \
 116   { "-bundle", "-Zbundle" },  \
 117   { "-bundle_loader", "-Zbundle_loader" },  \
 118   { "-weak_reference_mismatches", "-Zweak_reference_mismatches" },  \
 119   { "-dead_strip", "-Zdead_strip" }, \
 120   { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \
 121   { "-dependency-file", "-MF" }, \
 122   { "-dylib_file", "-Zdylib_file" }, \
 123   { "-dynamic", "-Zdynamic" },  \
 124   { "-dynamiclib", "-Zdynamiclib" },  \
 125   { "-exported_symbols_list", "-Zexported_symbols_list" },  \
 126   { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \
 127   { "-gused", "-g -feliminate-unused-debug-symbols" }, \
 128   { "-segaddr", "-Zsegaddr" }, \
 129   { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \
 130   { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \
 131   { "-seg_addr_table", "-Zseg_addr_table" }, \
 132   { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \
 133   { "-fapple-kext", "-fapple-kext -static -Wa,-static" }, \
 134   { "-filelist", "-Xlinker -filelist -Xlinker" },  \
 135   { "-findirect-virtual-calls", "-fapple-kext" }, \
 136   { "-flat_namespace", "-Zflat_namespace" },  \
 137   { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
 138   { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
 139   { "-framework", "-Xlinker -framework -Xlinker" },  \
 140   { "-fterminated-vtables", "-fapple-kext" }, \
 141   { "-image_base", "-Zimage_base" },  \
 142   { "-init", "-Zinit" },  \
 143   { "-install_name", "-Zinstall_name" },  \
 144   { "-mkernel", "-mkernel -static -Wa,-static" }, \
 145   { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
 146   { "-multiply_defined", "-Zmultiply_defined" },  \
 147   { "-multi_module", "-Zmulti_module" },  \
 148   { "-static", "-static -Wa,-static" },  \
 149   { "-single_module", "-Zsingle_module" },  \
 150   { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
 151   SUBTARGET_OPTION_TRANSLATE_TABLE
 152
 153 #define SUBSUBTARGET_OVERRIDE_OPTIONS                                   \
 154   do {                                                                  \
 155     darwin_override_options ();                                         \
 156   } while (0)
 157
 158 /* These compiler options take n arguments.  */
 159
 160 #undef  WORD_SWITCH_TAKES_ARG
 161 #define WORD_SWITCH_TAKES_ARG(STR)              \
 162   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
 163    !strcmp (STR, "Zallowable_client") ? 1 :     \
 164    !strcmp (STR, "arch") ? 1 :                  \
 165    !strcmp (STR, "arch_only") ? 1 :             \
 166    !strcmp (STR, "Zbundle_loader") ? 1 :        \
 167    !strcmp (STR, "client_name") ? 1 :           \
 168    !strcmp (STR, "compatibility_version") ? 1 : \
 169    !strcmp (STR, "current_version") ? 1 :       \
 170    !strcmp (STR, "Zdylib_file") ? 1 :           \
 171    !strcmp (STR, "Zexported_symbols_list") ? 1 : \
 172    !strcmp (STR, "Zimage_base") ? 1 :           \
 173    !strcmp (STR, "Zinit") ? 1 :                 \
 174    !strcmp (STR, "Zinstall_name") ? 1 :         \
 175    !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
 176    !strcmp (STR, "Zmultiply_defined") ? 1 :     \
 177    !strcmp (STR, "precomp-trustfile") ? 1 :     \
 178    !strcmp (STR, "read_only_relocs") ? 1 :      \
 179    !strcmp (STR, "sectcreate") ? 3 :            \
 180    !strcmp (STR, "sectorder") ? 3 :             \
 181    !strcmp (STR, "Zsegaddr") ? 2 :              \
 182    !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
 183    !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
 184    !strcmp (STR, "Zseg_addr_table") ? 1 :       \
 185    !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
 186    !strcmp (STR, "seg1addr") ? 1 :              \
 187    !strcmp (STR, "segprot") ? 3 :               \
 188    !strcmp (STR, "sub_library") ? 1 :           \
 189    !strcmp (STR, "sub_umbrella") ? 1 :          \
 190    !strcmp (STR, "umbrella") ? 1 :              \
 191    !strcmp (STR, "undefined") ? 1 :             \
 192    !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
 193    !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
 194    !strcmp (STR, "pagezero_size") ? 1 :         \
 195    !strcmp (STR, "segs_read_only_addr") ? 1 :   \
 196    !strcmp (STR, "segs_read_write_addr") ? 1 :  \
 197    !strcmp (STR, "sectalign") ? 3 :             \
 198    !strcmp (STR, "sectobjectsymbols") ? 2 :     \
 199    !strcmp (STR, "segcreate") ? 3 :             \
 200    !strcmp (STR, "dylinker_install_name") ? 1 : \
 201    0)
 202
 203 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
 204     if (flag_mkernel || flag_apple_kext)                                \
 205       {                                                                 \
 206         if (flag_use_cxa_atexit == 2)                                   \
 207           flag_use_cxa_atexit = 0;                                      \
 208         /* kexts should always be built without the coalesced sections  \
 209            because the kernel loader doesn't grok such sections.  */    \
 210         flag_weak = 0;                                                  \
 211         /* No RTTI in kexts.  */                                        \
 212         flag_rtti = 0;                                                  \
 213       }                                                                 \
 214   } while (0)
 215
 216 /* Machine dependent cpp options.  Don't add more options here, add
 217    them to darwin_cpp_builtins in darwin-c.c.  */
 218
 219 #undef  CPP_SPEC
 220 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
 221         " %{pthread:-D_REENTRANT}"
 222
 223 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
 224    precomp, libtool, and fat build additions.  Also we
 225    don't specify a second %G after %L because libSystem is
 226    self-contained and doesn't need to link against libgcc.a.  */
 227 /* In general, random Darwin linker flags should go into LINK_SPEC
 228    instead of LINK_COMMAND_SPEC.  The command spec is better for
 229    specifying the handling of options understood by generic Unix
 230    linkers, and for positional arguments like libraries.  */
 231 #define LINK_COMMAND_SPEC "\
 232 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 233     %{!Zdynamiclib:%(linker)}%{Zdynamiclib:/usr/bin/libtool} \
 234     %l %X %{d} %{s} %{t} %{Z} \
 235     %{!Zdynamiclib:%{A} %{e*} %{m} %{N} %{n} %{r} %{u*} %{x} %{z}} \
 236     %{o*}%{!o:-o a.out} \
 237     %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
 238     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
 239     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
 240     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
 241     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
 242 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 243     %{.c|.cc|.C|.cpp|.c++|.CPP|.m|.mm: \
 244     %{g*:%{!gstabs*:%{!gnone: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
 245
 246 #ifdef TARGET_SYSTEM_ROOT
 247 #define LINK_SYSROOT_SPEC \
 248   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
 249 #else
 250 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 251 #endif
 252
 253 /* Please keep the random linker options in alphabetical order (modulo
 254    'Z' and 'no' prefixes).  Options that can only go to one of libtool
 255    or ld must be listed twice, under both !Zdynamiclib and
 256    Zdynamiclib, with one of the cases reporting an error.  */
 257 /* Note that options taking arguments may appear multiple times on a
 258    command line with different arguments each time, so put a * after
 259    their names so all of them get passed.  */
 260 #define LINK_SPEC  \
 261   "%{static}%{!static:-dynamic} \
 262    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
 263    %{!Zdynamiclib: \
 264      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 265      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 266      %{Zbundle:-bundle} \
 267      %{Zbundle_loader*:-bundle_loader %*} \
 268      %{client_name*} \
 269      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 270 } \
 271      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 272      %{Zforce_flat_namespace:-force_flat_namespace} \
 273      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 274      %{keep_private_externs} \
 275      %{private_bundle} \
 276     } \
 277    %{Zdynamiclib: \
 278      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 279      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 280      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 281      %{compatibility_version*} \
 282      %{current_version*} \
 283      %{Zforce_cpusubtype_ALL:-arch_only %(darwin_arch)} \
 284      %{!Zforce_cpusubtype_ALL: -arch_only %(darwin_subarch)} \
 285      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 286      %{Zinstall_name*:-install_name %*} \
 287      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 288      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 289     } \
 290    %{Zall_load:-all_load}%{Zdynamiclib:%{!Zall_load:-noall_load}} \
 291    %{Zallowable_client*:-allowable_client %*} \
 292    %{Zbind_at_load:-bind_at_load} \
 293    %{Zarch_errors_fatal:-arch_errors_fatal} \
 294    %{Zdead_strip:-dead_strip} \
 295    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 296    %{Zdylib_file*:-dylib_file %*} \
 297    %{Zdynamic:-dynamic}\
 298    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 299    %{Zflat_namespace:-flat_namespace} \
 300    %{headerpad_max_install_names*} \
 301    %{Zimage_base*:-image_base %*} \
 302    %{Zinit*:-init %*} \
 303    %{mmacosx-version-min=*:-macosx_version_min %*} \
 304    %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
 305    %{nomultidefs} \
 306    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 307    %{Zmultiply_defined*:-multiply_defined %*} \
 308    %{!Zmultiply_defined*:%{shared-libgcc: \
 309      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
 310      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
 311    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 312    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 313    %{read_only_relocs} \
 314    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 315    %{Zsegaddr*:-segaddr %*} \
 316    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 317    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 318    %{Zseg_addr_table*: -seg_addr_table %*} \
 319    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 320    %{sub_library*} %{sub_umbrella*} \
 321    " LINK_SYSROOT_SPEC " \
 322    %{twolevel_namespace} %{twolevel_namespace_hints} \
 323    %{umbrella*} \
 324    %{undefined*} \
 325    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 326    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 327    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 328    %{X} \
 329    %{y*} \
 330    %{w} \
 331    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 332    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 333    %{whatsloaded} %{dylinker_install_name*} \
 334    %{dylinker} %{Mach} "
 335
 336
 337 /* Machine dependent libraries.  */
 338
 339 #define LIB_SPEC "%{!static:-lSystem}"
 340
 341 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 342    libraries to link against, and by not linking against libgcc_s on
 343    earlier-than-10.3.9.
 344
 345    Note that by default, -lgcc_eh is not linked against!  This is
 346    because in a future version of Darwin the EH frame information may
 347    be in a new format, or the fallback routine might be changed; if
 348    you want to explicitly link against the static version of those
 349    routines, because you know you don't need to unwind through system
 350    libraries, you need to explicitly say -static-libgcc.
 351
 352    If it is linked against, it has to be before -lgcc, because it may
 353    need symbols from -lgcc.  */
 354 #undef REAL_LIBGCC_SPEC
 355 #define REAL_LIBGCC_SPEC                                                   \
 356    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 357       shared-libgcc|fexceptions:                                           \
 358        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 359        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 360        -lgcc;                                                              \
 361       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 362        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 363        -lgcc}"
 364
 365 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
 366
 367    crt3.o provides __cxa_atexit on systems that don't have it.  Since
 368    it's only used with C++, which requires passing -shared-libgcc, key
 369    off that to avoid unnecessarily adding a destructor to every
 370    powerpc program built.  */
 371
 372 #undef  STARTFILE_SPEC
 373 #define STARTFILE_SPEC                                                      \
 374   "%{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
 375      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
 376                      %{!static:%{object:-lgcrt0.o}                          \
 377                                %{!object:%{preload:-lgcrt0.o}               \
 378                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
 379                 %{!pg:%{static:-lcrt0.o}                                    \
 380                       %{!static:%{object:-lcrt0.o}                          \
 381                                 %{!object:%{preload:-lcrt0.o}               \
 382                                   %{!preload:-lcrt1.o %(darwin_crt2)}}}}}}  \
 383   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
 384
 385 /* The native Darwin linker doesn't necessarily place files in the order
 386    that they're specified on the link line.  Thus, it is pointless
 387    to put anything in ENDFILE_SPEC.  */
 388 /* #define ENDFILE_SPEC "" */
 389
 390 /* Default Darwin ASM_SPEC, very simple.  */
 391 #define ASM_SPEC "-arch %(darwin_arch) \
 392   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
 393
 394 /* We still allow output of STABS.  */
 395
 396 #define DBX_DEBUGGING_INFO 1
 397
 398 /* Prefer DWARF2.  */
 399 #define DWARF2_DEBUGGING_INFO
 400 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 401
 402 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
 403 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
 404 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
 405 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
 406 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
 407 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
 408 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
 409 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
 410 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
 411 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
 412
 413 /* When generating stabs debugging, use N_BINCL entries.  */
 414
 415 #define DBX_USE_BINCL
 416
 417 /* There is no limit to the length of stabs strings.  */
 418
 419 #define DBX_CONTIN_LENGTH 0
 420
 421 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 422
 423 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 424
 425 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 426 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 427
 428 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 429    sections.  machopic_select_section ensures that weak variables go in
 430    coalesced sections.  Weak aliases (or any other kind of aliases) are
 431    not supported.  Weak symbols that aren't visible outside the .s file
 432    are not supported.  */
 433 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 434   do {                                                                  \
 435     if (ALIAS)                                                          \
 436       {                                                                 \
 437         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 438         break;                                                          \
 439       }                                                                 \
 440                                                                         \
 441     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 442       targetm.asm_out.globalize_label (FILE, NAME);                     \
 443     if (DECL_EXTERNAL (DECL))                                           \
 444       fputs ("\t.weak_reference ", FILE);                               \
 445     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
 446         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
 447       break;                                                            \
 448     else if (TREE_PUBLIC (DECL))                                        \
 449       fputs ("\t.weak_definition ", FILE);                              \
 450     else                                                                \
 451       break;                                                            \
 452     assemble_name (FILE, NAME);                                         \
 453     fputc ('\n', FILE);                                                 \
 454   } while (0)
 455
 456 /* Darwin has the pthread routines in libSystem, which every program
 457    links to, so there's no need for weak-ness for that.  */
 458 #define GTHREAD_USE_WEAK 0
 459
 460 /* The Darwin linker imposes two limitations on common symbols: they
 461    can't have hidden visibility, and they can't appear in dylibs.  As
 462    a consequence, we should never use common symbols to represent
 463    vague linkage. */
 464 #undef USE_COMMON_FOR_ONE_ONLY
 465 #define USE_COMMON_FOR_ONE_ONLY 0
 466
 467 /* The Darwin linker doesn't want coalesced symbols to appear in
 468    a static archive's table of contents. */
 469 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 470 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 471
 472 /* On Darwin, we don't (at the time of writing) have linkonce sections
 473    with names, so it's safe to make the class data not comdat.  */
 474 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 475
 476 /* We make exception information linkonce. */
 477 #undef TARGET_USES_WEAK_UNWIND_INFO
 478 #define TARGET_USES_WEAK_UNWIND_INFO 1
 479
 480 /* We need to use a nonlocal label for the start of an EH frame: the
 481    Darwin linker requires that a coalesced section start with a label.
 482    Unfortunately, it also requires that 'debug' sections don't contain
 483    labels.  */
 484 #undef FRAME_BEGIN_LABEL
 485 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
 486
 487 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 488    emit a label for an empty FDE. */
 489 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 490
 491 /* Emit a label to separate the exception table.  */
 492 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 493
 494 /* Our profiling scheme doesn't LP labels and counter words.  */
 495
 496 #define NO_PROFILE_COUNTERS     1
 497
 498 #undef  INIT_SECTION_ASM_OP
 499 #define INIT_SECTION_ASM_OP
 500
 501 #undef  INVOKE__main
 502
 503 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 504 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 505
 506 /* Always prefix with an underscore.  */
 507
 508 #define USER_LABEL_PREFIX "_"
 509
 510 /* Don't output a .file directive.  That is only used by the assembler for
 511    error reporting.  */
 512 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 513 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 514
 515 #undef  TARGET_ASM_FILE_END
 516 #define TARGET_ASM_FILE_END darwin_file_end
 517
 518 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 519   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 520
 521 /* Give ObjC methods pretty symbol names.  */
 522
 523 #undef  OBJC_GEN_METHOD_LABEL
 524 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 525   do { if (CAT_NAME)                                                    \
 526          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 527                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 528        else                                                             \
 529          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 530                   (CLASS_NAME), (SEL_NAME));                            \
 531      } while (0)
 532
 533 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 534    but it does need to be referenced via indirect PIC data pointers.
 535    The machopic_define_symbol calls are telling the machopic subsystem
 536    that the name *is* defined in this module, so it doesn't need to
 537    make them indirect.  */
 538
 539 #undef ASM_DECLARE_OBJECT_NAME
 540 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 541   do {                                                                  \
 542     const char *xname = NAME;                                           \
 543     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 544       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 545     if (! DECL_WEAK (DECL)                                              \
 546         && ((TREE_STATIC (DECL)                                         \
 547              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 548             || DECL_INITIAL (DECL)))                                    \
 549         machopic_define_symbol (DECL_RTL (DECL));                       \
 550     if ((TREE_STATIC (DECL)                                             \
 551          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 552         || DECL_INITIAL (DECL))                                         \
 553       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 554     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 555     /* Darwin doesn't support zero-size objects, so give them a         \
 556        byte.  */                                                        \
 557     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
 558       assemble_zeros (1);                                               \
 559   } while (0)
 560
 561 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 562   do {                                                                  \
 563     const char *xname = NAME;                                           \
 564     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 565       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 566     if (! DECL_WEAK (DECL)                                              \
 567         && ((TREE_STATIC (DECL)                                         \
 568              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 569             || DECL_INITIAL (DECL)))                                    \
 570         machopic_define_symbol (DECL_RTL (DECL));                       \
 571     if ((TREE_STATIC (DECL)                                             \
 572          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 573         || DECL_INITIAL (DECL))                                         \
 574       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 575     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 576   } while (0)
 577
 578 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
 579   do {                                                          \
 580     ASM_OUTPUT_LABEL (FILE, NAME);                              \
 581     /* Darwin doesn't support zero-size objects, so give them a \
 582        byte.  */                                                \
 583     if ((SIZE) == 0)                                            \
 584       assemble_zeros (1);                                       \
 585   } while (0)
 586
 587 /* Wrap new method names in quotes so the assembler doesn't gag.
 588    Make Objective-C internal symbols local.  */
 589
 590 #undef  ASM_OUTPUT_LABELREF
 591 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 592   do {                                                                       \
 593        const char *xname = (NAME);                                           \
 594        if (! strcmp (xname, "<pic base>"))                                   \
 595          machopic_output_function_base_name(FILE);                           \
 596        else if (xname[0] == '&' || xname[0] == '*')                          \
 597          {                                                                   \
 598            int len = strlen (xname);                                         \
 599            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 600              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 601            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 602              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 603            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 604              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 605            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 606              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 607            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 608              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 609            else                                                              \
 610              fputs (&xname[1], FILE);                                        \
 611          }                                                                   \
 612        else if (xname[0] == '+' || xname[0] == '-')                          \
 613          fprintf (FILE, "\"%s\"", xname);                                    \
 614        else if (!strncmp (xname, "_OBJC_", 6))                               \
 615          fprintf (FILE, "L%s", xname);                                       \
 616        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
 617          fprintf (FILE, "%s", xname);                                        \
 618        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 619          fprintf (FILE, "\"%s\"", xname);                                    \
 620        else                                                                  \
 621          asm_fprintf (FILE, "%U%s", xname);                                  \
 622   } while (0)
 623
 624 /* Output before executable code.  */
 625 #undef TEXT_SECTION_ASM_OP
 626 #define TEXT_SECTION_ASM_OP "\t.text"
 627
 628 /* Output before writable data.  */
 629
 630 #undef DATA_SECTION_ASM_OP
 631 #define DATA_SECTION_ASM_OP "\t.data"
 632
 633 #undef  ALIGN_ASM_OP
 634 #define ALIGN_ASM_OP            ".align"
 635
 636 #undef  ASM_OUTPUT_ALIGN
 637 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 638   if ((LOG) != 0)                       \
 639     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
 640
 641 /* Ensure correct alignment of bss data.  */
 642
 643 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 644 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 645   do {                                                                  \
 646     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 647     fputs (".lcomm ", (FILE));                                          \
 648     assemble_name ((FILE), (NAME));                                     \
 649     if (_new_size == 0) _new_size = 1;                                  \
 650     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
 651              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
 652     if ((DECL) && ((TREE_STATIC (DECL)                                  \
 653          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 654         || DECL_INITIAL (DECL)))                                        \
 655       {                                                                 \
 656         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
 657         machopic_define_symbol (DECL_RTL (DECL));                       \
 658       }                                                                 \
 659   } while (0)
 660
 661 /* The maximum alignment which the object file format can support.
 662    For Mach-O, this is 2^15.  */
 663
 664 #undef  MAX_OFILE_ALIGNMENT
 665 #define MAX_OFILE_ALIGNMENT 0x8000
 666
 667 /* Declare the section variables.  */
 668 #ifndef USED_FOR_TARGET
 669 enum darwin_section_enum {
 670 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 671 #include "darwin-sections.def"
 672 #undef DEF_SECTION
 673   NUM_DARWIN_SECTIONS
 674 };
 675 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 676 #endif
 677
 678 #undef  TARGET_ASM_SELECT_SECTION
 679 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 680 #define USE_SELECT_SECTION_FOR_FUNCTIONS
 681
 682 #undef  TARGET_ASM_SELECT_RTX_SECTION
 683 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 684 #undef  TARGET_ASM_UNIQUE_SECTION
 685 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 686 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 687 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 688
 689
 690 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 691     do {                                                                \
 692          if (FILE) {                                                    \
 693            if (MACHOPIC_INDIRECT)                                       \
 694              fprintf (FILE, "\t.lazy_reference ");                      \
 695            else                                                         \
 696              fprintf (FILE, "\t.reference ");                           \
 697            assemble_name (FILE, NAME);                                  \
 698            fprintf (FILE, "\n");                                        \
 699          }                                                              \
 700        } while (0)
 701
 702 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 703     do {                                                                \
 704          if (FILE) {                                                    \
 705            fprintf (FILE, "\t");                                        \
 706            assemble_name (FILE, NAME);                                  \
 707            fprintf (FILE, "=0\n");                                      \
 708            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
 709          }                                                              \
 710        } while (0)
 711
 712 /* Globalizing directive for a label.  */
 713 #define GLOBAL_ASM_OP ".globl "
 714 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 715
 716 /* Emit an assembler directive to set visibility for a symbol.  Used
 717    to support visibility attribute and Darwin's private extern
 718    feature.  */
 719 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 720 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 721
 722 /* Extra attributes for Darwin.  */
 723 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 724   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 725   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
 726     darwin_handle_kext_attribute },                                          \
 727   { "weak_import", 0, 0, true, false, false,                                 \
 728     darwin_handle_weak_import_attribute }
 729
 730 #undef ASM_GENERATE_INTERNAL_LABEL
 731 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 732   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 733
 734 #undef TARGET_ASM_MARK_DECL_PRESERVED
 735 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 736
 737 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
 738    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
 739    variable has been defined in this translation unit.
 740    When porting Mach-O to new architectures you need to make
 741    sure these aren't clobbered by the backend.  */
 742
 743 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
 744 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 745
 746 /* Set on a symbol to indicate when fix-and-continue style code
 747    generation is being used and the symbol refers to a static symbol
 748    that should be rebound from new instances of a translation unit to
 749    the original instance of the data.  */
 750
 751 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 752
 753 /* Symbolic names for various things we might know about a symbol.  */
 754
 755 enum machopic_addr_class {
 756   MACHOPIC_UNDEFINED,
 757   MACHOPIC_DEFINED_DATA,
 758   MACHOPIC_UNDEFINED_DATA,
 759   MACHOPIC_DEFINED_FUNCTION,
 760   MACHOPIC_UNDEFINED_FUNCTION
 761 };
 762
 763 /* Macros defining the various PIC cases.  */
 764
 765 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
 766 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
 767 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
 768 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
 769
 770 #undef TARGET_ENCODE_SECTION_INFO
 771 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 772 #undef TARGET_STRIP_NAME_ENCODING
 773 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 774
 775 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 776   do {                                                          \
 777     const char *const stub_ = (STUB);                           \
 778     char *buffer_ = (BUF);                                      \
 779     strcpy (buffer_, stub_);                                    \
 780     if (stub_[0] == '"')                                        \
 781       {                                                         \
 782         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 783       }                                                         \
 784     else                                                        \
 785       {                                                         \
 786         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 787       }                                                         \
 788   } while (0)
 789
 790 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 791   do {                                                          \
 792     const char *const symbol_ = (SYMBOL);                       \
 793     char *buffer_ = (BUF);                                      \
 794     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 795       {                                                         \
 796           sprintf (buffer_, "\"%s\"", symbol_);                 \
 797       }                                                         \
 798     else                                                        \
 799       {                                                         \
 800         strcpy (buffer_, symbol_);                              \
 801       }                                                         \
 802   } while (0)
 803
 804 /* Given a symbol name string, create the lazy pointer version
 805    of the symbol name.  */
 806
 807 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 808   do {                                                          \
 809     const char *symbol_ = (SYMBOL);                             \
 810     char *buffer_ = (BUF);                                      \
 811     if (symbol_[0] == '"')                                      \
 812       {                                                         \
 813         strcpy (buffer_, "\"L");                                \
 814         strcpy (buffer_ + 2, symbol_ + 1);                      \
 815         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 816       }                                                         \
 817     else if (name_needs_quotes (symbol_))                       \
 818       {                                                         \
 819         strcpy (buffer_, "\"L");                                \
 820         strcpy (buffer_ + 2, symbol_);                          \
 821         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 822       }                                                         \
 823     else                                                        \
 824       {                                                         \
 825         strcpy (buffer_, "L");                                  \
 826         strcpy (buffer_ + 1, symbol_);                          \
 827         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 828       }                                                         \
 829   } while (0)
 830
 831 #define EH_FRAME_SECTION_NAME   "__TEXT"
 832 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
 833
 834 /* Java runtime class list.  */
 835 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 836
 837 #undef ASM_PREFERRED_EH_DATA_FORMAT
 838 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 839   (((CODE) == 2 && (GLOBAL) == 1) \
 840    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
 841      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 842
 843 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
 844   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
 845
 846 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
 847   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
 848
 849 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
 850       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
 851         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
 852         goto DONE;                                                                      \
 853       }
 854
 855 /* Experimentally, putting jump tables in text is faster on SPEC.
 856    Also this is needed for correctness for coalesced functions.  */
 857
 858 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 859 #define JUMP_TABLES_IN_TEXT_SECTION 1
 860 #endif
 861
 862 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
 863
 864 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
 865 #undef TARGET_ASM_NAMED_SECTION
 866 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
 867
 868 /* Handle pragma weak and pragma pack.  */
 869 #define HANDLE_SYSV_PRAGMA 1
 870
 871 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 872
 873 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
 874   do {                                                          \
 875     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
 876     c_register_pragma (0, "options", darwin_pragma_options);    \
 877     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
 878     c_register_pragma (0, "unused", darwin_pragma_unused);      \
 879     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
 880   } while (0)
 881
 882 #undef ASM_APP_ON
 883 #define ASM_APP_ON ""
 884 #undef ASM_APP_OFF
 885 #define ASM_APP_OFF ""
 886
 887 void darwin_register_frameworks (const char *, const char *, int);
 888 void darwin_register_objc_includes (const char *, const char *, int);
 889 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
 890 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
 891
 892 void add_framework_path (char *);
 893 #define TARGET_OPTF add_framework_path
 894
 895 #define TARGET_POSIX_IO
 896
 897 /* All new versions of Darwin have C99 functions.  */
 898
 899 #define TARGET_C99_FUNCTIONS 1
 900
 901 #define WINT_TYPE "int"
 902
 903 /* Every program on darwin links against libSystem which contains the pthread
 904    routines, so there's no need to explicitly call out when doing threaded
 905    work.  */
 906
 907 #undef GOMP_SELF_SPECS
 908 #define GOMP_SELF_SPECS ""
 909
 910 /* Darwin can't support anchors until we can cope with the adjustments
 911    to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
 912    when outputting members of an anchor block and the linker can be
 913    taught to keep them together or we find some other suitable
 914    code-gen technique.  */
 915
 916 #if 0
 917 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 918 #else
 919 #define TARGET_ASM_OUTPUT_ANCHOR NULL
 920 #endif
 921
 922 /* Attempt to turn on execute permission for the stack.  This may be
 923     used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
 924     if the target machine can change execute permissions on a page).
 925
 926     There is no way to query the execute permission of the stack, so
 927     we always issue the mprotect() call.
 928
 929     Unfortunately it is not possible to make this namespace-clean.
 930
 931     Also note that no errors should be emitted by this code; it is
 932     considered dangerous for library calls to send messages to
 933     stdout/stderr.  */
 934
 935 #define ENABLE_EXECUTE_STACK                                            \
 936 extern void __enable_execute_stack (void *);                            \
 937 void                                                                    \
 938 __enable_execute_stack (void *addr)                                     \
 939 {                                                                       \
 940    extern int mprotect (void *, size_t, int);                           \
 941    extern int getpagesize (void);                                       \
 942    static int size;                                                     \
 943    static long mask;                                                    \
 944                                                                         \
 945    char *page, *end;                                                    \
 946                                                                         \
 947    if (size == 0)                                                       \
 948      {                                                                  \
 949        size = getpagesize();                                            \
 950        mask = ~((long) size - 1);                                       \
 951      }                                                                  \
 952                                                                         \
 953    page = (char *) (((long) addr) & mask);                              \
 954    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
 955                                                                         \
 956    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
 957    (void) mprotect (page, end - page, 7);                               \
 958 }
 959
 960 /* For Apple KEXTs, we make the constructors return this to match gcc
 961    2.95.  */
 962 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
 963 extern int flag_mkernel;
 964 extern int flag_apple_kext;
 965 #define TARGET_KEXTABI flag_apple_kext
 966
 967 #endif /* CONFIG_DARWIN_H */