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, 2006
   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     %(linker) %l %X %{d} %{s} %{t} %{Z} \
 234     %{A} %{e*} %{m} %{r} %{x} \
 235     %{o*}%{!o:-o a.out} \
 236     %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
 237     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
 238     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
 239     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
 240     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
 241 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 242     %{.c|.cc|.C|.cpp|.c++|.CPP|.m|.mm: \
 243     %{gdwarf-2:%{!gstabs*:%{!g0: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
 244
 245 #ifdef TARGET_SYSTEM_ROOT
 246 #define LINK_SYSROOT_SPEC \
 247   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
 248 #else
 249 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 250 #endif
 251
 252 /* Please keep the random linker options in alphabetical order (modulo
 253    'Z' and 'no' prefixes). Note that options taking arguments may appear
 254    multiple times on a command line with different arguments each time,
 255    so put a * after their names so all of them get passed.  */
 256 #define LINK_SPEC  \
 257   "%{static}%{!static:-dynamic} \
 258    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
 259    %{!Zdynamiclib: \
 260      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 261      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 262      %{Zbundle:-bundle} \
 263      %{Zbundle_loader*:-bundle_loader %*} \
 264      %{client_name*} \
 265      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 266 } \
 267      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 268      %{Zforce_flat_namespace:-force_flat_namespace} \
 269      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 270      %{keep_private_externs} \
 271      %{private_bundle} \
 272     } \
 273    %{Zdynamiclib: -dylib \
 274      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 275      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 276      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 277      %{compatibility_version*:-dylib_compatibility_version %*} \
 278      %{current_version*:-dylib_current_version %*} \
 279      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
 280      %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
 281      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 282      %{Zinstall_name*:-dylib_install_name %*} \
 283      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 284      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 285     } \
 286    %{Zall_load:-all_load} \
 287    %{Zallowable_client*:-allowable_client %*} \
 288    %{Zbind_at_load:-bind_at_load} \
 289    %{Zarch_errors_fatal:-arch_errors_fatal} \
 290    %{Zdead_strip:-dead_strip} \
 291    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 292    %{Zdylib_file*:-dylib_file %*} \
 293    %{Zdynamic:-dynamic}\
 294    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 295    %{Zflat_namespace:-flat_namespace} \
 296    %{headerpad_max_install_names*} \
 297    %{Zimage_base*:-image_base %*} \
 298    %{Zinit*:-init %*} \
 299    %{mmacosx-version-min=*:-macosx_version_min %*} \
 300    %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
 301    %{nomultidefs} \
 302    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 303    %{Zmultiply_defined*:-multiply_defined %*} \
 304    %{!Zmultiply_defined*:%{shared-libgcc: \
 305      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
 306      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
 307    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 308    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 309    %{read_only_relocs} \
 310    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 311    %{Zsegaddr*:-segaddr %*} \
 312    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 313    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 314    %{Zseg_addr_table*: -seg_addr_table %*} \
 315    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 316    %{sub_library*} %{sub_umbrella*} \
 317    " LINK_SYSROOT_SPEC " \
 318    %{twolevel_namespace} %{twolevel_namespace_hints} \
 319    %{umbrella*} \
 320    %{undefined*} \
 321    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 322    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 323    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 324    %{X} \
 325    %{y*} \
 326    %{w} \
 327    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 328    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 329    %{whatsloaded} %{dylinker_install_name*} \
 330    %{dylinker} %{Mach} "
 331
 332
 333 /* Machine dependent libraries.  */
 334
 335 #define LIB_SPEC "%{!static:-lSystem}"
 336
 337 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 338    libraries to link against, and by not linking against libgcc_s on
 339    earlier-than-10.3.9.
 340
 341    Note that by default, -lgcc_eh is not linked against!  This is
 342    because in a future version of Darwin the EH frame information may
 343    be in a new format, or the fallback routine might be changed; if
 344    you want to explicitly link against the static version of those
 345    routines, because you know you don't need to unwind through system
 346    libraries, you need to explicitly say -static-libgcc.
 347
 348    If it is linked against, it has to be before -lgcc, because it may
 349    need symbols from -lgcc.  */
 350 #undef REAL_LIBGCC_SPEC
 351 #define REAL_LIBGCC_SPEC                                                   \
 352    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 353       shared-libgcc|fexceptions:                                           \
 354        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 355        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 356        -lgcc;                                                              \
 357       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 358        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 359        -lgcc}"
 360
 361 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
 362
 363    crt3.o provides __cxa_atexit on systems that don't have it.  Since
 364    it's only used with C++, which requires passing -shared-libgcc, key
 365    off that to avoid unnecessarily adding a destructor to every
 366    powerpc program built.  */
 367
 368 #undef  STARTFILE_SPEC
 369 #define STARTFILE_SPEC                                                      \
 370   "%{Zdynamiclib: %(darwin_dylib1) }                                        \
 371    %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
 372      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
 373                      %{!static:%{object:-lgcrt0.o}                          \
 374                                %{!object:%{preload:-lgcrt0.o}               \
 375                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
 376                 %{!pg:%{static:-lcrt0.o}                                    \
 377                       %{!static:%{object:-lcrt0.o}                          \
 378                                 %{!object:%{preload:-lcrt0.o}               \
 379                                   %{!preload: %(darwin_crt1)  %(darwin_crt2)}}}}}}  \
 380   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
 381
 382 /* The native Darwin linker doesn't necessarily place files in the order
 383    that they're specified on the link line.  Thus, it is pointless
 384    to put anything in ENDFILE_SPEC.  */
 385 /* #define ENDFILE_SPEC "" */
 386
 387 #define DARWIN_EXTRA_SPECS     \
 388   { "darwin_crt1", DARWIN_CRT1_SPEC },                                 \
 389   { "darwin_dylib1", DARWIN_DYLIB1_SPEC },
 390
 391 #define DARWIN_DYLIB1_SPEC                                             \
 392   "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)          \
 393    %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
 394
 395 #define DARWIN_CRT1_SPEC                                               \
 396   "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)            \
 397    %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)"
 398
 399 /* Default Darwin ASM_SPEC, very simple.  */
 400 #define ASM_SPEC "-arch %(darwin_arch) \
 401   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
 402
 403 /* We still allow output of STABS.  */
 404
 405 #define DBX_DEBUGGING_INFO 1
 406
 407 #define DWARF2_DEBUGGING_INFO
 408 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 409
 410 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
 411 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
 412 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
 413 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
 414 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
 415 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
 416 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
 417 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
 418 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
 419 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
 420 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
 421
 422 /* When generating stabs debugging, use N_BINCL entries.  */
 423
 424 #define DBX_USE_BINCL
 425
 426 /* There is no limit to the length of stabs strings.  */
 427
 428 #define DBX_CONTIN_LENGTH 0
 429
 430 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 431
 432 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 433
 434 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 435 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 436
 437 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 438    sections.  machopic_select_section ensures that weak variables go in
 439    coalesced sections.  Weak aliases (or any other kind of aliases) are
 440    not supported.  Weak symbols that aren't visible outside the .s file
 441    are not supported.  */
 442 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 443   do {                                                                  \
 444     if (ALIAS)                                                          \
 445       {                                                                 \
 446         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 447         break;                                                          \
 448       }                                                                 \
 449                                                                         \
 450     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 451       targetm.asm_out.globalize_label (FILE, NAME);                     \
 452     if (DECL_EXTERNAL (DECL))                                           \
 453       fputs ("\t.weak_reference ", FILE);                               \
 454     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
 455         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
 456       break;                                                            \
 457     else if (TREE_PUBLIC (DECL))                                        \
 458       fputs ("\t.weak_definition ", FILE);                              \
 459     else                                                                \
 460       break;                                                            \
 461     assemble_name (FILE, NAME);                                         \
 462     fputc ('\n', FILE);                                                 \
 463   } while (0)
 464
 465 /* Darwin has the pthread routines in libSystem, which every program
 466    links to, so there's no need for weak-ness for that.  */
 467 #define GTHREAD_USE_WEAK 0
 468
 469 /* The Darwin linker imposes two limitations on common symbols: they
 470    can't have hidden visibility, and they can't appear in dylibs.  As
 471    a consequence, we should never use common symbols to represent
 472    vague linkage. */
 473 #undef USE_COMMON_FOR_ONE_ONLY
 474 #define USE_COMMON_FOR_ONE_ONLY 0
 475
 476 /* The Darwin linker doesn't want coalesced symbols to appear in
 477    a static archive's table of contents. */
 478 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 479 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 480
 481 /* On Darwin, we don't (at the time of writing) have linkonce sections
 482    with names, so it's safe to make the class data not comdat.  */
 483 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 484
 485 /* For efficiency, on Darwin the RTTI information that is always
 486    emitted in the standard C++ library should not be COMDAT.  */
 487 #define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
 488
 489 /* We make exception information linkonce. */
 490 #undef TARGET_USES_WEAK_UNWIND_INFO
 491 #define TARGET_USES_WEAK_UNWIND_INFO 1
 492
 493 /* We need to use a nonlocal label for the start of an EH frame: the
 494    Darwin linker requires that a coalesced section start with a label.
 495    Unfortunately, it also requires that 'debug' sections don't contain
 496    labels.  */
 497 #undef FRAME_BEGIN_LABEL
 498 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
 499
 500 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 501    emit a label for an empty FDE. */
 502 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 503
 504 /* Emit a label to separate the exception table.  */
 505 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 506
 507 /* Our profiling scheme doesn't LP labels and counter words.  */
 508
 509 #define NO_PROFILE_COUNTERS     1
 510
 511 #undef  INIT_SECTION_ASM_OP
 512 #define INIT_SECTION_ASM_OP
 513
 514 #undef  INVOKE__main
 515
 516 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 517 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 518
 519 /* Always prefix with an underscore.  */
 520
 521 #define USER_LABEL_PREFIX "_"
 522
 523 /* Don't output a .file directive.  That is only used by the assembler for
 524    error reporting.  */
 525 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 526 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 527
 528 #undef  TARGET_ASM_FILE_END
 529 #define TARGET_ASM_FILE_END darwin_file_end
 530
 531 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 532   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 533
 534 /* Give ObjC methods pretty symbol names.  */
 535
 536 #undef  OBJC_GEN_METHOD_LABEL
 537 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 538   do { if (CAT_NAME)                                                    \
 539          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 540                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 541        else                                                             \
 542          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 543                   (CLASS_NAME), (SEL_NAME));                            \
 544      } while (0)
 545
 546 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 547    but it does need to be referenced via indirect PIC data pointers.
 548    The machopic_define_symbol calls are telling the machopic subsystem
 549    that the name *is* defined in this module, so it doesn't need to
 550    make them indirect.  */
 551
 552 #undef ASM_DECLARE_OBJECT_NAME
 553 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 554   do {                                                                  \
 555     const char *xname = NAME;                                           \
 556     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 557       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 558     if (! DECL_WEAK (DECL)                                              \
 559         && ((TREE_STATIC (DECL)                                         \
 560              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 561             || DECL_INITIAL (DECL)))                                    \
 562         machopic_define_symbol (DECL_RTL (DECL));                       \
 563     if ((TREE_STATIC (DECL)                                             \
 564          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 565         || DECL_INITIAL (DECL))                                         \
 566       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 567     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 568     /* Darwin doesn't support zero-size objects, so give them a         \
 569        byte.  */                                                        \
 570     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
 571       assemble_zeros (1);                                               \
 572   } while (0)
 573
 574 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 575   do {                                                                  \
 576     const char *xname = NAME;                                           \
 577     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 578       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 579     if (! DECL_WEAK (DECL)                                              \
 580         && ((TREE_STATIC (DECL)                                         \
 581              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 582             || DECL_INITIAL (DECL)))                                    \
 583         machopic_define_symbol (DECL_RTL (DECL));                       \
 584     if ((TREE_STATIC (DECL)                                             \
 585          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 586         || DECL_INITIAL (DECL))                                         \
 587       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 588     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 589   } while (0)
 590
 591 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
 592   do {                                                          \
 593     ASM_OUTPUT_LABEL (FILE, NAME);                              \
 594     /* Darwin doesn't support zero-size objects, so give them a \
 595        byte.  */                                                \
 596     if ((SIZE) == 0)                                            \
 597       assemble_zeros (1);                                       \
 598   } while (0)
 599
 600 /* Wrap new method names in quotes so the assembler doesn't gag.
 601    Make Objective-C internal symbols local.  */
 602
 603 #undef  ASM_OUTPUT_LABELREF
 604 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 605   do {                                                                       \
 606        const char *xname = (NAME);                                           \
 607        if (! strcmp (xname, "<pic base>"))                                   \
 608          machopic_output_function_base_name(FILE);                           \
 609        else if (xname[0] == '&' || xname[0] == '*')                          \
 610          {                                                                   \
 611            int len = strlen (xname);                                         \
 612            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 613              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 614            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 615              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 616            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 617              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 618            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 619              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 620            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 621              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 622            else                                                              \
 623              fputs (&xname[1], FILE);                                        \
 624          }                                                                   \
 625        else if (xname[0] == '+' || xname[0] == '-')                          \
 626          fprintf (FILE, "\"%s\"", xname);                                    \
 627        else if (!strncmp (xname, "_OBJC_", 6))                               \
 628          fprintf (FILE, "L%s", xname);                                       \
 629        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
 630          fprintf (FILE, "%s", xname);                                        \
 631        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 632          fprintf (FILE, "\"%s\"", xname);                                    \
 633        else                                                                  \
 634          asm_fprintf (FILE, "%U%s", xname);                                  \
 635   } while (0)
 636
 637 /* Output before executable code.  */
 638 #undef TEXT_SECTION_ASM_OP
 639 #define TEXT_SECTION_ASM_OP "\t.text"
 640
 641 /* Output before writable data.  */
 642
 643 #undef DATA_SECTION_ASM_OP
 644 #define DATA_SECTION_ASM_OP "\t.data"
 645
 646 #undef  ALIGN_ASM_OP
 647 #define ALIGN_ASM_OP            ".align"
 648
 649 #undef  ASM_OUTPUT_ALIGN
 650 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 651   if ((LOG) != 0)                       \
 652     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
 653
 654 /* Ensure correct alignment of bss data.  */
 655
 656 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 657 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 658   do {                                                                  \
 659     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 660     fputs (".lcomm ", (FILE));                                          \
 661     assemble_name ((FILE), (NAME));                                     \
 662     if (_new_size == 0) _new_size = 1;                                  \
 663     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
 664              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
 665     if ((DECL) && ((TREE_STATIC (DECL)                                  \
 666          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 667         || DECL_INITIAL (DECL)))                                        \
 668       {                                                                 \
 669         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
 670         machopic_define_symbol (DECL_RTL (DECL));                       \
 671       }                                                                 \
 672   } while (0)
 673
 674 /* The maximum alignment which the object file format can support.
 675    For Mach-O, this is 2^15.  */
 676
 677 #undef  MAX_OFILE_ALIGNMENT
 678 #define MAX_OFILE_ALIGNMENT 0x8000
 679
 680 /* Declare the section variables.  */
 681 #ifndef USED_FOR_TARGET
 682 enum darwin_section_enum {
 683 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 684 #include "darwin-sections.def"
 685 #undef DEF_SECTION
 686   NUM_DARWIN_SECTIONS
 687 };
 688 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 689 #endif
 690
 691 #undef  TARGET_ASM_SELECT_SECTION
 692 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 693 #define USE_SELECT_SECTION_FOR_FUNCTIONS
 694
 695 #undef  TARGET_ASM_SELECT_RTX_SECTION
 696 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 697 #undef  TARGET_ASM_UNIQUE_SECTION
 698 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 699 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 700 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 701
 702
 703 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 704     do {                                                                \
 705          if (FILE) {                                                    \
 706            if (MACHOPIC_INDIRECT)                                       \
 707              fprintf (FILE, "\t.lazy_reference ");                      \
 708            else                                                         \
 709              fprintf (FILE, "\t.reference ");                           \
 710            assemble_name (FILE, NAME);                                  \
 711            fprintf (FILE, "\n");                                        \
 712          }                                                              \
 713        } while (0)
 714
 715 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 716     do {                                                                \
 717          if (FILE) {                                                    \
 718            fprintf (FILE, "\t");                                        \
 719            assemble_name (FILE, NAME);                                  \
 720            fprintf (FILE, "=0\n");                                      \
 721            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
 722          }                                                              \
 723        } while (0)
 724
 725 /* Globalizing directive for a label.  */
 726 #define GLOBAL_ASM_OP ".globl "
 727 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 728
 729 /* Emit an assembler directive to set visibility for a symbol.  Used
 730    to support visibility attribute and Darwin's private extern
 731    feature.  */
 732 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 733 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 734
 735 /* Extra attributes for Darwin.  */
 736 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 737   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 738   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
 739     darwin_handle_kext_attribute },                                          \
 740   { "weak_import", 0, 0, true, false, false,                                 \
 741     darwin_handle_weak_import_attribute }
 742
 743 #undef ASM_GENERATE_INTERNAL_LABEL
 744 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 745   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 746
 747 #undef TARGET_ASM_MARK_DECL_PRESERVED
 748 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 749
 750 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
 751    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
 752    variable has been defined in this translation unit.
 753    When porting Mach-O to new architectures you need to make
 754    sure these aren't clobbered by the backend.  */
 755
 756 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
 757 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 758
 759 /* Set on a symbol to indicate when fix-and-continue style code
 760    generation is being used and the symbol refers to a static symbol
 761    that should be rebound from new instances of a translation unit to
 762    the original instance of the data.  */
 763
 764 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 765
 766 /* Symbolic names for various things we might know about a symbol.  */
 767
 768 enum machopic_addr_class {
 769   MACHOPIC_UNDEFINED,
 770   MACHOPIC_DEFINED_DATA,
 771   MACHOPIC_UNDEFINED_DATA,
 772   MACHOPIC_DEFINED_FUNCTION,
 773   MACHOPIC_UNDEFINED_FUNCTION
 774 };
 775
 776 /* Macros defining the various PIC cases.  */
 777
 778 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
 779 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
 780 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
 781 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
 782
 783 #undef TARGET_ENCODE_SECTION_INFO
 784 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 785 #undef TARGET_STRIP_NAME_ENCODING
 786 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 787
 788 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 789   do {                                                          \
 790     const char *const stub_ = (STUB);                           \
 791     char *buffer_ = (BUF);                                      \
 792     strcpy (buffer_, stub_);                                    \
 793     if (stub_[0] == '"')                                        \
 794       {                                                         \
 795         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 796       }                                                         \
 797     else                                                        \
 798       {                                                         \
 799         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 800       }                                                         \
 801   } while (0)
 802
 803 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 804   do {                                                          \
 805     const char *const symbol_ = (SYMBOL);                       \
 806     char *buffer_ = (BUF);                                      \
 807     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 808       {                                                         \
 809           sprintf (buffer_, "\"%s\"", symbol_);                 \
 810       }                                                         \
 811     else                                                        \
 812       {                                                         \
 813         strcpy (buffer_, symbol_);                              \
 814       }                                                         \
 815   } while (0)
 816
 817 /* Given a symbol name string, create the lazy pointer version
 818    of the symbol name.  */
 819
 820 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 821   do {                                                          \
 822     const char *symbol_ = (SYMBOL);                             \
 823     char *buffer_ = (BUF);                                      \
 824     if (symbol_[0] == '"')                                      \
 825       {                                                         \
 826         strcpy (buffer_, "\"L");                                \
 827         strcpy (buffer_ + 2, symbol_ + 1);                      \
 828         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 829       }                                                         \
 830     else if (name_needs_quotes (symbol_))                       \
 831       {                                                         \
 832         strcpy (buffer_, "\"L");                                \
 833         strcpy (buffer_ + 2, symbol_);                          \
 834         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 835       }                                                         \
 836     else                                                        \
 837       {                                                         \
 838         strcpy (buffer_, "L");                                  \
 839         strcpy (buffer_ + 1, symbol_);                          \
 840         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 841       }                                                         \
 842   } while (0)
 843
 844 #define EH_FRAME_SECTION_NAME   "__TEXT"
 845 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
 846
 847 /* Java runtime class list.  */
 848 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 849
 850 #undef ASM_PREFERRED_EH_DATA_FORMAT
 851 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 852   (((CODE) == 2 && (GLOBAL) == 1) \
 853    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
 854      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 855
 856 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
 857   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
 858
 859 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
 860   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
 861
 862 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
 863       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
 864         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
 865         goto DONE;                                                                      \
 866       }
 867
 868 /* Experimentally, putting jump tables in text is faster on SPEC.
 869    Also this is needed for correctness for coalesced functions.  */
 870
 871 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 872 #define JUMP_TABLES_IN_TEXT_SECTION 1
 873 #endif
 874
 875 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
 876
 877 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
 878 #undef TARGET_ASM_NAMED_SECTION
 879 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
 880
 881 /* Handle pragma weak and pragma pack.  */
 882 #define HANDLE_SYSV_PRAGMA 1
 883
 884 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 885
 886 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
 887   do {                                                          \
 888     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
 889     c_register_pragma (0, "options", darwin_pragma_options);    \
 890     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
 891     c_register_pragma (0, "unused", darwin_pragma_unused);      \
 892     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
 893   } while (0)
 894
 895 #undef ASM_APP_ON
 896 #define ASM_APP_ON ""
 897 #undef ASM_APP_OFF
 898 #define ASM_APP_OFF ""
 899
 900 void darwin_register_frameworks (const char *, const char *, int);
 901 void darwin_register_objc_includes (const char *, const char *, int);
 902 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
 903 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
 904
 905 void add_framework_path (char *);
 906 #define TARGET_OPTF add_framework_path
 907
 908 #define TARGET_POSIX_IO
 909
 910 /* All new versions of Darwin have C99 functions.  */
 911
 912 #define TARGET_C99_FUNCTIONS 1
 913
 914 #define WINT_TYPE "int"
 915
 916 /* Every program on darwin links against libSystem which contains the pthread
 917    routines, so there's no need to explicitly call out when doing threaded
 918    work.  */
 919
 920 #undef GOMP_SELF_SPECS
 921 #define GOMP_SELF_SPECS ""
 922
 923 /* Darwin can't support anchors until we can cope with the adjustments
 924    to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
 925    when outputting members of an anchor block and the linker can be
 926    taught to keep them together or we find some other suitable
 927    code-gen technique.  */
 928
 929 #if 0
 930 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 931 #else
 932 #define TARGET_ASM_OUTPUT_ANCHOR NULL
 933 #endif
 934
 935 /* Attempt to turn on execute permission for the stack.  This may be
 936     used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
 937     if the target machine can change execute permissions on a page).
 938
 939     There is no way to query the execute permission of the stack, so
 940     we always issue the mprotect() call.
 941
 942     Unfortunately it is not possible to make this namespace-clean.
 943
 944     Also note that no errors should be emitted by this code; it is
 945     considered dangerous for library calls to send messages to
 946     stdout/stderr.  */
 947
 948 #define ENABLE_EXECUTE_STACK                                            \
 949 extern void __enable_execute_stack (void *);                            \
 950 void                                                                    \
 951 __enable_execute_stack (void *addr)                                     \
 952 {                                                                       \
 953    extern int mprotect (void *, size_t, int);                           \
 954    extern int getpagesize (void);                                       \
 955    static int size;                                                     \
 956    static long mask;                                                    \
 957                                                                         \
 958    char *page, *end;                                                    \
 959                                                                         \
 960    if (size == 0)                                                       \
 961      {                                                                  \
 962        size = getpagesize();                                            \
 963        mask = ~((long) size - 1);                                       \
 964      }                                                                  \
 965                                                                         \
 966    page = (char *) (((long) addr) & mask);                              \
 967    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
 968                                                                         \
 969    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
 970    (void) mprotect (page, end - page, 7);                               \
 971 }
 972
 973 /* For Apple KEXTs, we make the constructors return this to match gcc
 974    2.95.  */
 975 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
 976 extern int flag_mkernel;
 977 extern int flag_apple_kext;
 978 #define TARGET_KEXTABI flag_apple_kext
 979
 980 #endif /* CONFIG_DARWIN_H */