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, 2007
   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   { "-umbrella", "-Zumbrella" }, \
 134   { "-fapple-kext", "-fapple-kext -static -Wa,-static" }, \
 135   { "-filelist", "-Xlinker -filelist -Xlinker" },  \
 136   { "-findirect-virtual-calls", "-fapple-kext" }, \
 137   { "-flat_namespace", "-Zflat_namespace" },  \
 138   { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
 139   { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
 140   { "-framework", "-Xlinker -framework -Xlinker" },  \
 141   { "-fterminated-vtables", "-fapple-kext" }, \
 142   { "-image_base", "-Zimage_base" },  \
 143   { "-init", "-Zinit" },  \
 144   { "-install_name", "-Zinstall_name" },  \
 145   { "-mkernel", "-mkernel -static -Wa,-static" }, \
 146   { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
 147   { "-multiply_defined", "-Zmultiply_defined" },  \
 148   { "-multi_module", "-Zmulti_module" },  \
 149   { "-static", "-static -Wa,-static" },  \
 150   { "-shared", "-Zdynamiclib" }, \
 151   { "-single_module", "-Zsingle_module" },  \
 152   { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
 153   SUBTARGET_OPTION_TRANSLATE_TABLE
 154
 155 #define SUBSUBTARGET_OVERRIDE_OPTIONS                                   \
 156   do {                                                                  \
 157     darwin_override_options ();                                         \
 158   } while (0)
 159
 160 /* These compiler options take n arguments.  */
 161
 162 #undef  WORD_SWITCH_TAKES_ARG
 163 #define WORD_SWITCH_TAKES_ARG(STR)              \
 164   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
 165    !strcmp (STR, "Zallowable_client") ? 1 :     \
 166    !strcmp (STR, "arch") ? 1 :                  \
 167    !strcmp (STR, "arch_only") ? 1 :             \
 168    !strcmp (STR, "Zbundle_loader") ? 1 :        \
 169    !strcmp (STR, "client_name") ? 1 :           \
 170    !strcmp (STR, "compatibility_version") ? 1 : \
 171    !strcmp (STR, "current_version") ? 1 :       \
 172    !strcmp (STR, "Zdylib_file") ? 1 :           \
 173    !strcmp (STR, "Zexported_symbols_list") ? 1 : \
 174    !strcmp (STR, "Zimage_base") ? 1 :           \
 175    !strcmp (STR, "Zinit") ? 1 :                 \
 176    !strcmp (STR, "Zinstall_name") ? 1 :         \
 177    !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
 178    !strcmp (STR, "Zmultiply_defined") ? 1 :     \
 179    !strcmp (STR, "precomp-trustfile") ? 1 :     \
 180    !strcmp (STR, "read_only_relocs") ? 1 :      \
 181    !strcmp (STR, "sectcreate") ? 3 :            \
 182    !strcmp (STR, "sectorder") ? 3 :             \
 183    !strcmp (STR, "Zsegaddr") ? 2 :              \
 184    !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
 185    !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
 186    !strcmp (STR, "Zseg_addr_table") ? 1 :       \
 187    !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
 188    !strcmp (STR, "seg1addr") ? 1 :              \
 189    !strcmp (STR, "segprot") ? 3 :               \
 190    !strcmp (STR, "sub_library") ? 1 :           \
 191    !strcmp (STR, "sub_umbrella") ? 1 :          \
 192    !strcmp (STR, "Zumbrella") ? 1 :             \
 193    !strcmp (STR, "undefined") ? 1 :             \
 194    !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
 195    !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
 196    !strcmp (STR, "pagezero_size") ? 1 :         \
 197    !strcmp (STR, "segs_read_only_addr") ? 1 :   \
 198    !strcmp (STR, "segs_read_write_addr") ? 1 :  \
 199    !strcmp (STR, "sectalign") ? 3 :             \
 200    !strcmp (STR, "sectobjectsymbols") ? 2 :     \
 201    !strcmp (STR, "segcreate") ? 3 :             \
 202    !strcmp (STR, "dylinker_install_name") ? 1 : \
 203    0)
 204
 205 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
 206     if (flag_mkernel || flag_apple_kext)                                \
 207       {                                                                 \
 208         if (flag_use_cxa_atexit == 2)                                   \
 209           flag_use_cxa_atexit = 0;                                      \
 210         /* kexts should always be built without the coalesced sections  \
 211            because the kernel loader doesn't grok such sections.  */    \
 212         flag_weak = 0;                                                  \
 213         /* No RTTI in kexts.  */                                        \
 214         flag_rtti = 0;                                                  \
 215       }                                                                 \
 216   } while (0)
 217
 218 /* Machine dependent cpp options.  Don't add more options here, add
 219    them to darwin_cpp_builtins in darwin-c.c.  */
 220
 221 #undef  CPP_SPEC
 222 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
 223         " %{pthread:-D_REENTRANT}"
 224
 225 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
 226    precomp, libtool, and fat build additions.  Also we
 227    don't specify a second %G after %L because libSystem is
 228    self-contained and doesn't need to link against libgcc.a.  */
 229 /* In general, random Darwin linker flags should go into LINK_SPEC
 230    instead of LINK_COMMAND_SPEC.  The command spec is better for
 231    specifying the handling of options understood by generic Unix
 232    linkers, and for positional arguments like libraries.  */
 233 #define LINK_COMMAND_SPEC "\
 234 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 235     %(linker) %l %X %{d} %{s} %{t} %{Z} %{u*} \
 236     %{A} %{e*} %{m} %{r} %{x} \
 237     %{o*}%{!o:-o a.out} \
 238     %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
 239     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
 240     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
 241     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
 242     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
 243 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 244     %{.c|.cc|.C|.cpp|.c++|.cxx|.CPP|.m|.mm: \
 245     %{gdwarf-2:%{!gstabs*:%{!g0: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
 246
 247 #ifdef TARGET_SYSTEM_ROOT
 248 #define LINK_SYSROOT_SPEC \
 249   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
 250 #else
 251 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 252 #endif
 253
 254 /* Please keep the random linker options in alphabetical order (modulo
 255    'Z' and 'no' prefixes). Note that options taking arguments may appear
 256    multiple times on a command line with different arguments each time,
 257    so put a * after their names so all of them get passed.  */
 258 #define LINK_SPEC  \
 259   "%{static}%{!static:-dynamic} \
 260    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
 261    %{!Zdynamiclib: \
 262      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 263      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 264      %{Zbundle:-bundle} \
 265      %{Zbundle_loader*:-bundle_loader %*} \
 266      %{client_name*} \
 267      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 268 } \
 269      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 270      %{Zforce_flat_namespace:-force_flat_namespace} \
 271      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 272      %{keep_private_externs} \
 273      %{private_bundle} \
 274     } \
 275    %{Zdynamiclib: -dylib \
 276      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 277      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 278      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 279      %{compatibility_version*:-dylib_compatibility_version %*} \
 280      %{current_version*:-dylib_current_version %*} \
 281      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
 282      %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
 283      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 284      %{Zinstall_name*:-dylib_install_name %*} \
 285      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 286      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 287     } \
 288    %{Zall_load:-all_load} \
 289    %{Zallowable_client*:-allowable_client %*} \
 290    %{Zbind_at_load:-bind_at_load} \
 291    %{Zarch_errors_fatal:-arch_errors_fatal} \
 292    %{Zdead_strip:-dead_strip} \
 293    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 294    %{Zdylib_file*:-dylib_file %*} \
 295    %{Zdynamic:-dynamic}\
 296    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 297    %{Zflat_namespace:-flat_namespace} \
 298    %{headerpad_max_install_names*} \
 299    %{Zimage_base*:-image_base %*} \
 300    %{Zinit*:-init %*} \
 301    %{!mmacosx-version-min=*:-macosx_version_min %(darwin_minversion)} \
 302    %{mmacosx-version-min=*:-macosx_version_min %*} \
 303    %{nomultidefs} \
 304    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 305    %{Zmultiply_defined*:-multiply_defined %*} \
 306    %{!Zmultiply_defined*:%{shared-libgcc: \
 307      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
 308      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
 309    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 310    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 311    %{read_only_relocs} \
 312    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 313    %{Zsegaddr*:-segaddr %*} \
 314    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 315    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 316    %{Zseg_addr_table*: -seg_addr_table %*} \
 317    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 318    %{sub_library*} %{sub_umbrella*} \
 319    " LINK_SYSROOT_SPEC " \
 320    %{twolevel_namespace} %{twolevel_namespace_hints} \
 321    %{Zumbrella*: -umbrella %*} \
 322    %{undefined*} \
 323    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 324    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 325    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 326    %{X} \
 327    %{y*} \
 328    %{w} \
 329    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 330    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 331    %{whatsloaded} %{dylinker_install_name*} \
 332    %{dylinker} %{Mach} "
 333
 334
 335 /* Machine dependent libraries.  */
 336
 337 #define LIB_SPEC "%{!static:-lSystem}"
 338
 339 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 340    libraries to link against, and by not linking against libgcc_s on
 341    earlier-than-10.3.9.
 342
 343    Note that by default, -lgcc_eh is not linked against!  This is
 344    because in a future version of Darwin the EH frame information may
 345    be in a new format, or the fallback routine might be changed; if
 346    you want to explicitly link against the static version of those
 347    routines, because you know you don't need to unwind through system
 348    libraries, you need to explicitly say -static-libgcc.
 349
 350    If it is linked against, it has to be before -lgcc, because it may
 351    need symbols from -lgcc.  */
 352 #undef REAL_LIBGCC_SPEC
 353 #define REAL_LIBGCC_SPEC                                                   \
 354    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 355       shared-libgcc|fexceptions|fgnu-runtime:                              \
 356        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 357        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 358        -lgcc;                                                              \
 359       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 360        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 361        -lgcc}"
 362
 363 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
 364
 365    crt3.o provides __cxa_atexit on systems that don't have it.  Since
 366    it's only used with C++, which requires passing -shared-libgcc, key
 367    off that to avoid unnecessarily adding a destructor to every
 368    powerpc program built.  */
 369
 370 #undef  STARTFILE_SPEC
 371 #define STARTFILE_SPEC                                                      \
 372   "%{Zdynamiclib: %(darwin_dylib1) }                                        \
 373    %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
 374      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
 375                      %{!static:%{object:-lgcrt0.o}                          \
 376                                %{!object:%{preload:-lgcrt0.o}               \
 377                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
 378                 %{!pg:%{static:-lcrt0.o}                                    \
 379                       %{!static:%{object:-lcrt0.o}                          \
 380                                 %{!object:%{preload:-lcrt0.o}               \
 381                                   %{!preload: %(darwin_crt1)                \
 382                                               %(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 #define DARWIN_EXTRA_SPECS                                              \
 391   { "darwin_crt1", DARWIN_CRT1_SPEC },                                  \
 392   { "darwin_dylib1", DARWIN_DYLIB1_SPEC },                              \
 393   { "darwin_minversion", DARWIN_MINVERSION_SPEC },
 394
 395 #define DARWIN_DYLIB1_SPEC                                              \
 396   "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)           \
 397    %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
 398
 399 #define DARWIN_CRT1_SPEC                                                \
 400   "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)             \
 401    %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)"
 402
 403 /* Default Darwin ASM_SPEC, very simple.  */
 404 #define ASM_SPEC "-arch %(darwin_arch) \
 405   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
 406
 407 /* We still allow output of STABS.  */
 408
 409 #define DBX_DEBUGGING_INFO 1
 410
 411 #define DWARF2_DEBUGGING_INFO
 412 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 413
 414 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
 415 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
 416 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
 417 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
 418 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
 419 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
 420 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
 421 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
 422 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
 423 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
 424 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
 425
 426 /* When generating stabs debugging, use N_BINCL entries.  */
 427
 428 #define DBX_USE_BINCL
 429
 430 /* There is no limit to the length of stabs strings.  */
 431
 432 #define DBX_CONTIN_LENGTH 0
 433
 434 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 435
 436 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 437
 438 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 439 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 440
 441 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 442    sections.  machopic_select_section ensures that weak variables go in
 443    coalesced sections.  Weak aliases (or any other kind of aliases) are
 444    not supported.  Weak symbols that aren't visible outside the .s file
 445    are not supported.  */
 446 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 447   do {                                                                  \
 448     if (ALIAS)                                                          \
 449       {                                                                 \
 450         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 451         break;                                                          \
 452       }                                                                 \
 453                                                                         \
 454     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 455       targetm.asm_out.globalize_label (FILE, NAME);                     \
 456     if (DECL_EXTERNAL (DECL))                                           \
 457       fputs ("\t.weak_reference ", FILE);                               \
 458     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
 459         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
 460       break;                                                            \
 461     else if (TREE_PUBLIC (DECL))                                        \
 462       fputs ("\t.weak_definition ", FILE);                              \
 463     else                                                                \
 464       break;                                                            \
 465     assemble_name (FILE, NAME);                                         \
 466     fputc ('\n', FILE);                                                 \
 467   } while (0)
 468
 469 /* Darwin has the pthread routines in libSystem, which every program
 470    links to, so there's no need for weak-ness for that.  */
 471 #define GTHREAD_USE_WEAK 0
 472
 473 /* The Darwin linker imposes two limitations on common symbols: they
 474    can't have hidden visibility, and they can't appear in dylibs.  As
 475    a consequence, we should never use common symbols to represent
 476    vague linkage. */
 477 #undef USE_COMMON_FOR_ONE_ONLY
 478 #define USE_COMMON_FOR_ONE_ONLY 0
 479
 480 /* The Darwin linker doesn't want coalesced symbols to appear in
 481    a static archive's table of contents. */
 482 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 483 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 484
 485 /* On Darwin, we don't (at the time of writing) have linkonce sections
 486    with names, so it's safe to make the class data not comdat.  */
 487 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 488
 489 /* For efficiency, on Darwin the RTTI information that is always
 490    emitted in the standard C++ library should not be COMDAT.  */
 491 #define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
 492
 493 /* We make exception information linkonce. */
 494 #undef TARGET_USES_WEAK_UNWIND_INFO
 495 #define TARGET_USES_WEAK_UNWIND_INFO 1
 496
 497 /* We need to use a nonlocal label for the start of an EH frame: the
 498    Darwin linker requires that a coalesced section start with a label.
 499    Unfortunately, it also requires that 'debug' sections don't contain
 500    labels.  */
 501 #undef FRAME_BEGIN_LABEL
 502 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
 503
 504 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 505    emit a label for an empty FDE. */
 506 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 507
 508 /* Emit a label to separate the exception table.  */
 509 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 510
 511 /* Our profiling scheme doesn't LP labels and counter words.  */
 512
 513 #define NO_PROFILE_COUNTERS     1
 514
 515 #undef  INIT_SECTION_ASM_OP
 516 #define INIT_SECTION_ASM_OP
 517
 518 #undef  INVOKE__main
 519
 520 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 521 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 522
 523 /* Always prefix with an underscore.  */
 524
 525 #define USER_LABEL_PREFIX "_"
 526
 527 /* Don't output a .file directive.  That is only used by the assembler for
 528    error reporting.  */
 529 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 530 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 531
 532 #undef  TARGET_ASM_FILE_END
 533 #define TARGET_ASM_FILE_END darwin_file_end
 534
 535 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 536   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 537
 538 /* Give ObjC methods pretty symbol names.  */
 539
 540 #undef  OBJC_GEN_METHOD_LABEL
 541 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 542   do { if (CAT_NAME)                                                    \
 543          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 544                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 545        else                                                             \
 546          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 547                   (CLASS_NAME), (SEL_NAME));                            \
 548      } while (0)
 549
 550 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 551    but it does need to be referenced via indirect PIC data pointers.
 552    The machopic_define_symbol calls are telling the machopic subsystem
 553    that the name *is* defined in this module, so it doesn't need to
 554    make them indirect.  */
 555
 556 #undef ASM_DECLARE_OBJECT_NAME
 557 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 558   do {                                                                  \
 559     const char *xname = NAME;                                           \
 560     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 561       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 562     if (! DECL_WEAK (DECL)                                              \
 563         && ((TREE_STATIC (DECL)                                         \
 564              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 565             || DECL_INITIAL (DECL)))                                    \
 566         machopic_define_symbol (DECL_RTL (DECL));                       \
 567     if ((TREE_STATIC (DECL)                                             \
 568          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 569         || DECL_INITIAL (DECL))                                         \
 570       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 571     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 572     /* Darwin doesn't support zero-size objects, so give them a         \
 573        byte.  */                                                        \
 574     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
 575       assemble_zeros (1);                                               \
 576   } while (0)
 577
 578 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 579   do {                                                                  \
 580     const char *xname = NAME;                                           \
 581     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 582       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 583     if (! DECL_WEAK (DECL)                                              \
 584         && ((TREE_STATIC (DECL)                                         \
 585              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 586             || DECL_INITIAL (DECL)))                                    \
 587         machopic_define_symbol (DECL_RTL (DECL));                       \
 588     if ((TREE_STATIC (DECL)                                             \
 589          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 590         || DECL_INITIAL (DECL))                                         \
 591       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 592     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 593   } while (0)
 594
 595 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
 596   do {                                                          \
 597     ASM_OUTPUT_LABEL (FILE, NAME);                              \
 598     /* Darwin doesn't support zero-size objects, so give them a \
 599        byte.  */                                                \
 600     if ((SIZE) == 0)                                            \
 601       assemble_zeros (1);                                       \
 602   } while (0)
 603
 604 /* Wrap new method names in quotes so the assembler doesn't gag.
 605    Make Objective-C internal symbols local.  */
 606
 607 #undef  ASM_OUTPUT_LABELREF
 608 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 609   do {                                                                       \
 610        const char *xname = (NAME);                                           \
 611        if (! strcmp (xname, "<pic base>"))                                   \
 612          machopic_output_function_base_name(FILE);                           \
 613        else if (xname[0] == '&' || xname[0] == '*')                          \
 614          {                                                                   \
 615            int len = strlen (xname);                                         \
 616            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 617              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 618            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 619              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 620            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 621              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 622            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 623              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 624            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 625              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 626            else                                                              \
 627              fputs (&xname[1], FILE);                                        \
 628          }                                                                   \
 629        else if (xname[0] == '+' || xname[0] == '-')                          \
 630          fprintf (FILE, "\"%s\"", xname);                                    \
 631        else if (!strncmp (xname, "_OBJC_", 6))                               \
 632          fprintf (FILE, "L%s", xname);                                       \
 633        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
 634          fprintf (FILE, "%s", xname);                                        \
 635        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 636          fprintf (FILE, "\"%s\"", xname);                                    \
 637        else                                                                  \
 638          asm_fprintf (FILE, "%U%s", xname);                                  \
 639   } while (0)
 640
 641 /* Output before executable code.  */
 642 #undef TEXT_SECTION_ASM_OP
 643 #define TEXT_SECTION_ASM_OP "\t.text"
 644
 645 /* Output before writable data.  */
 646
 647 #undef DATA_SECTION_ASM_OP
 648 #define DATA_SECTION_ASM_OP "\t.data"
 649
 650 #undef  ALIGN_ASM_OP
 651 #define ALIGN_ASM_OP            ".align"
 652
 653 #undef  ASM_OUTPUT_ALIGN
 654 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 655   if ((LOG) != 0)                       \
 656     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
 657
 658 /* Ensure correct alignment of bss data.  */
 659
 660 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 661 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 662   do {                                                                  \
 663     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 664     fputs (".lcomm ", (FILE));                                          \
 665     assemble_name ((FILE), (NAME));                                     \
 666     if (_new_size == 0) _new_size = 1;                                  \
 667     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
 668              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
 669     if ((DECL) && ((TREE_STATIC (DECL)                                  \
 670          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 671         || DECL_INITIAL (DECL)))                                        \
 672       {                                                                 \
 673         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
 674         machopic_define_symbol (DECL_RTL (DECL));                       \
 675       }                                                                 \
 676   } while (0)
 677
 678 /* The maximum alignment which the object file format can support in
 679    bits.  For Mach-O, this is 2^15 bytes.  */
 680
 681 #undef  MAX_OFILE_ALIGNMENT
 682 #define MAX_OFILE_ALIGNMENT (0x8000 * 8)
 683
 684 /* Declare the section variables.  */
 685 #ifndef USED_FOR_TARGET
 686 enum darwin_section_enum {
 687 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 688 #include "darwin-sections.def"
 689 #undef DEF_SECTION
 690   NUM_DARWIN_SECTIONS
 691 };
 692 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 693 #endif
 694
 695 #undef  TARGET_ASM_SELECT_SECTION
 696 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 697 #define USE_SELECT_SECTION_FOR_FUNCTIONS
 698
 699 #undef  TARGET_ASM_SELECT_RTX_SECTION
 700 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 701 #undef  TARGET_ASM_UNIQUE_SECTION
 702 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 703 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 704 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 705 #undef  TARGET_ASM_RELOC_RW_MASK
 706 #define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask
 707
 708
 709 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 710     do {                                                                \
 711          if (FILE) {                                                    \
 712            if (MACHOPIC_INDIRECT)                                       \
 713              fprintf (FILE, "\t.lazy_reference ");                      \
 714            else                                                         \
 715              fprintf (FILE, "\t.reference ");                           \
 716            assemble_name (FILE, NAME);                                  \
 717            fprintf (FILE, "\n");                                        \
 718          }                                                              \
 719        } while (0)
 720
 721 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 722     do {                                                                \
 723          if (FILE) {                                                    \
 724            fprintf (FILE, "\t");                                        \
 725            assemble_name (FILE, NAME);                                  \
 726            fprintf (FILE, "=0\n");                                      \
 727            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
 728          }                                                              \
 729        } while (0)
 730
 731 /* Globalizing directive for a label.  */
 732 #define GLOBAL_ASM_OP ".globl "
 733 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 734
 735 /* Emit an assembler directive to set visibility for a symbol.  Used
 736    to support visibility attribute and Darwin's private extern
 737    feature.  */
 738 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 739 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 740
 741 /* Extra attributes for Darwin.  */
 742 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 743   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 744   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
 745     darwin_handle_kext_attribute },                                          \
 746   { "weak_import", 0, 0, true, false, false,                                 \
 747     darwin_handle_weak_import_attribute }
 748
 749 #undef ASM_GENERATE_INTERNAL_LABEL
 750 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 751   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 752
 753 #undef TARGET_ASM_MARK_DECL_PRESERVED
 754 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 755
 756 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
 757    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
 758    variable has been defined in this translation unit.
 759    When porting Mach-O to new architectures you need to make
 760    sure these aren't clobbered by the backend.  */
 761
 762 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
 763 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 764
 765 /* Set on a symbol to indicate when fix-and-continue style code
 766    generation is being used and the symbol refers to a static symbol
 767    that should be rebound from new instances of a translation unit to
 768    the original instance of the data.  */
 769
 770 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 771
 772 /* Symbolic names for various things we might know about a symbol.  */
 773
 774 enum machopic_addr_class {
 775   MACHOPIC_UNDEFINED,
 776   MACHOPIC_DEFINED_DATA,
 777   MACHOPIC_UNDEFINED_DATA,
 778   MACHOPIC_DEFINED_FUNCTION,
 779   MACHOPIC_UNDEFINED_FUNCTION
 780 };
 781
 782 /* Macros defining the various PIC cases.  */
 783
 784 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
 785 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
 786 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
 787 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
 788
 789 #undef TARGET_ENCODE_SECTION_INFO
 790 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 791 #undef TARGET_STRIP_NAME_ENCODING
 792 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 793
 794 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 795   do {                                                          \
 796     const char *const stub_ = (STUB);                           \
 797     char *buffer_ = (BUF);                                      \
 798     strcpy (buffer_, stub_);                                    \
 799     if (stub_[0] == '"')                                        \
 800       {                                                         \
 801         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 802       }                                                         \
 803     else                                                        \
 804       {                                                         \
 805         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 806       }                                                         \
 807   } while (0)
 808
 809 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 810   do {                                                          \
 811     const char *const symbol_ = (SYMBOL);                       \
 812     char *buffer_ = (BUF);                                      \
 813     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 814       {                                                         \
 815           sprintf (buffer_, "\"%s\"", symbol_);                 \
 816       }                                                         \
 817     else                                                        \
 818       {                                                         \
 819         strcpy (buffer_, symbol_);                              \
 820       }                                                         \
 821   } while (0)
 822
 823 /* Given a symbol name string, create the lazy pointer version
 824    of the symbol name.  */
 825
 826 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 827   do {                                                          \
 828     const char *symbol_ = (SYMBOL);                             \
 829     char *buffer_ = (BUF);                                      \
 830     if (symbol_[0] == '"')                                      \
 831       {                                                         \
 832         strcpy (buffer_, "\"L");                                \
 833         strcpy (buffer_ + 2, symbol_ + 1);                      \
 834         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 835       }                                                         \
 836     else if (name_needs_quotes (symbol_))                       \
 837       {                                                         \
 838         strcpy (buffer_, "\"L");                                \
 839         strcpy (buffer_ + 2, symbol_);                          \
 840         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 841       }                                                         \
 842     else                                                        \
 843       {                                                         \
 844         strcpy (buffer_, "L");                                  \
 845         strcpy (buffer_ + 1, symbol_);                          \
 846         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 847       }                                                         \
 848   } while (0)
 849
 850 #define EH_FRAME_SECTION_NAME   "__TEXT"
 851 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
 852
 853 /* Java runtime class list.  */
 854 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 855
 856 #undef ASM_PREFERRED_EH_DATA_FORMAT
 857 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 858   (((CODE) == 2 && (GLOBAL) == 1) \
 859    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
 860      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 861
 862 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
 863   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
 864
 865 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
 866   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
 867
 868 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
 869       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
 870         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
 871         goto DONE;                                                                      \
 872       }
 873
 874 /* Experimentally, putting jump tables in text is faster on SPEC.
 875    Also this is needed for correctness for coalesced functions.  */
 876
 877 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 878 #define JUMP_TABLES_IN_TEXT_SECTION 1
 879 #endif
 880
 881 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
 882
 883 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
 884 #undef TARGET_ASM_NAMED_SECTION
 885 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
 886
 887 /* Handle pragma weak and pragma pack.  */
 888 #define HANDLE_SYSV_PRAGMA 1
 889
 890 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 891
 892 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
 893   do {                                                          \
 894     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
 895     c_register_pragma (0, "options", darwin_pragma_options);    \
 896     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
 897     c_register_pragma (0, "unused", darwin_pragma_unused);      \
 898     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
 899   } while (0)
 900
 901 #undef ASM_APP_ON
 902 #define ASM_APP_ON ""
 903 #undef ASM_APP_OFF
 904 #define ASM_APP_OFF ""
 905
 906 void darwin_register_frameworks (const char *, const char *, int);
 907 void darwin_register_objc_includes (const char *, const char *, int);
 908 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
 909 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
 910
 911 void add_framework_path (char *);
 912 #define TARGET_OPTF add_framework_path
 913
 914 #define TARGET_POSIX_IO
 915
 916 /* All new versions of Darwin have C99 functions.  */
 917
 918 #define TARGET_C99_FUNCTIONS 1
 919
 920 #define WINT_TYPE "int"
 921
 922 /* Every program on darwin links against libSystem which contains the pthread
 923    routines, so there's no need to explicitly call out when doing threaded
 924    work.  */
 925
 926 #undef GOMP_SELF_SPECS
 927 #define GOMP_SELF_SPECS ""
 928
 929 /* Darwin can't support anchors until we can cope with the adjustments
 930    to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
 931    when outputting members of an anchor block and the linker can be
 932    taught to keep them together or we find some other suitable
 933    code-gen technique.  */
 934
 935 #if 0
 936 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 937 #else
 938 #define TARGET_ASM_OUTPUT_ANCHOR NULL
 939 #endif
 940
 941 /* Attempt to turn on execute permission for the stack.  This may be
 942     used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
 943     if the target machine can change execute permissions on a page).
 944
 945     There is no way to query the execute permission of the stack, so
 946     we always issue the mprotect() call.
 947
 948     Unfortunately it is not possible to make this namespace-clean.
 949
 950     Also note that no errors should be emitted by this code; it is
 951     considered dangerous for library calls to send messages to
 952     stdout/stderr.  */
 953
 954 #define ENABLE_EXECUTE_STACK                                            \
 955 extern void __enable_execute_stack (void *);                            \
 956 void                                                                    \
 957 __enable_execute_stack (void *addr)                                     \
 958 {                                                                       \
 959    extern int mprotect (void *, size_t, int);                           \
 960    extern int getpagesize (void);                                       \
 961    static int size;                                                     \
 962    static long mask;                                                    \
 963                                                                         \
 964    char *page, *end;                                                    \
 965                                                                         \
 966    if (size == 0)                                                       \
 967      {                                                                  \
 968        size = getpagesize();                                            \
 969        mask = ~((long) size - 1);                                       \
 970      }                                                                  \
 971                                                                         \
 972    page = (char *) (((long) addr) & mask);                              \
 973    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
 974                                                                         \
 975    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
 976    (void) mprotect (page, end - page, 7);                               \
 977 }
 978
 979 /* For Apple KEXTs, we make the constructors return this to match gcc
 980    2.95.  */
 981 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
 982 extern int flag_mkernel;
 983 extern int flag_apple_kext;
 984 #define TARGET_KEXTABI flag_apple_kext
 985
 986 #define TARGET_HAS_TARGETCM 1
 987
 988 #endif /* CONFIG_DARWIN_H */