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   { "-single_module", "-Zsingle_module" },  \
 151   { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
 152   SUBTARGET_OPTION_TRANSLATE_TABLE
 153
 154 #define SUBSUBTARGET_OVERRIDE_OPTIONS                                   \
 155   do {                                                                  \
 156     darwin_override_options ();                                         \
 157   } while (0)
 158
 159 /* These compiler options take n arguments.  */
 160
 161 #undef  WORD_SWITCH_TAKES_ARG
 162 #define WORD_SWITCH_TAKES_ARG(STR)              \
 163   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
 164    !strcmp (STR, "Zallowable_client") ? 1 :     \
 165    !strcmp (STR, "arch") ? 1 :                  \
 166    !strcmp (STR, "arch_only") ? 1 :             \
 167    !strcmp (STR, "Zbundle_loader") ? 1 :        \
 168    !strcmp (STR, "client_name") ? 1 :           \
 169    !strcmp (STR, "compatibility_version") ? 1 : \
 170    !strcmp (STR, "current_version") ? 1 :       \
 171    !strcmp (STR, "Zdylib_file") ? 1 :           \
 172    !strcmp (STR, "Zexported_symbols_list") ? 1 : \
 173    !strcmp (STR, "Zimage_base") ? 1 :           \
 174    !strcmp (STR, "Zinit") ? 1 :                 \
 175    !strcmp (STR, "Zinstall_name") ? 1 :         \
 176    !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
 177    !strcmp (STR, "Zmultiply_defined") ? 1 :     \
 178    !strcmp (STR, "precomp-trustfile") ? 1 :     \
 179    !strcmp (STR, "read_only_relocs") ? 1 :      \
 180    !strcmp (STR, "sectcreate") ? 3 :            \
 181    !strcmp (STR, "sectorder") ? 3 :             \
 182    !strcmp (STR, "Zsegaddr") ? 2 :              \
 183    !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
 184    !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
 185    !strcmp (STR, "Zseg_addr_table") ? 1 :       \
 186    !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
 187    !strcmp (STR, "seg1addr") ? 1 :              \
 188    !strcmp (STR, "segprot") ? 3 :               \
 189    !strcmp (STR, "sub_library") ? 1 :           \
 190    !strcmp (STR, "sub_umbrella") ? 1 :          \
 191    !strcmp (STR, "Zumbrella") ? 1 :             \
 192    !strcmp (STR, "undefined") ? 1 :             \
 193    !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
 194    !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
 195    !strcmp (STR, "pagezero_size") ? 1 :         \
 196    !strcmp (STR, "segs_read_only_addr") ? 1 :   \
 197    !strcmp (STR, "segs_read_write_addr") ? 1 :  \
 198    !strcmp (STR, "sectalign") ? 3 :             \
 199    !strcmp (STR, "sectobjectsymbols") ? 2 :     \
 200    !strcmp (STR, "segcreate") ? 3 :             \
 201    !strcmp (STR, "dylinker_install_name") ? 1 : \
 202    0)
 203
 204 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
 205     if (flag_mkernel || flag_apple_kext)                                \
 206       {                                                                 \
 207         if (flag_use_cxa_atexit == 2)                                   \
 208           flag_use_cxa_atexit = 0;                                      \
 209         /* kexts should always be built without the coalesced sections  \
 210            because the kernel loader doesn't grok such sections.  */    \
 211         flag_weak = 0;                                                  \
 212         /* No RTTI in kexts.  */                                        \
 213         flag_rtti = 0;                                                  \
 214       }                                                                 \
 215   } while (0)
 216
 217 /* Machine dependent cpp options.  Don't add more options here, add
 218    them to darwin_cpp_builtins in darwin-c.c.  */
 219
 220 #undef  CPP_SPEC
 221 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
 222         " %{pthread:-D_REENTRANT}"
 223
 224 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
 225    precomp, libtool, and fat build additions.  Also we
 226    don't specify a second %G after %L because libSystem is
 227    self-contained and doesn't need to link against libgcc.a.  */
 228 /* In general, random Darwin linker flags should go into LINK_SPEC
 229    instead of LINK_COMMAND_SPEC.  The command spec is better for
 230    specifying the handling of options understood by generic Unix
 231    linkers, and for positional arguments like libraries.  */
 232 #define LINK_COMMAND_SPEC "\
 233 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 234     %(linker) %l %X %{d} %{s} %{t} %{Z} %{u*} \
 235     %{A} %{e*} %{m} %{r} %{x} \
 236     %{o*}%{!o:-o a.out} \
 237     %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
 238     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
 239     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
 240     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
 241     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
 242 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 243     %{.c|.cc|.C|.cpp|.c++|.CPP|.m|.mm: \
 244     %{gdwarf-2:%{!gstabs*:%{!g0: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
 245
 246 #ifdef TARGET_SYSTEM_ROOT
 247 #define LINK_SYSROOT_SPEC \
 248   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
 249 #else
 250 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 251 #endif
 252
 253 /* Please keep the random linker options in alphabetical order (modulo
 254    'Z' and 'no' prefixes). Note that options taking arguments may appear
 255    multiple times on a command line with different arguments each time,
 256    so put a * after their names so all of them get passed.  */
 257 #define LINK_SPEC  \
 258   "%{static}%{!static:-dynamic} \
 259    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
 260    %{!Zdynamiclib: \
 261      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 262      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 263      %{Zbundle:-bundle} \
 264      %{Zbundle_loader*:-bundle_loader %*} \
 265      %{client_name*} \
 266      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 267 } \
 268      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 269      %{Zforce_flat_namespace:-force_flat_namespace} \
 270      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 271      %{keep_private_externs} \
 272      %{private_bundle} \
 273     } \
 274    %{Zdynamiclib: -dylib \
 275      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 276      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 277      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 278      %{compatibility_version*:-dylib_compatibility_version %*} \
 279      %{current_version*:-dylib_current_version %*} \
 280      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
 281      %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
 282      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 283      %{Zinstall_name*:-dylib_install_name %*} \
 284      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 285      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 286     } \
 287    %{Zall_load:-all_load} \
 288    %{Zallowable_client*:-allowable_client %*} \
 289    %{Zbind_at_load:-bind_at_load} \
 290    %{Zarch_errors_fatal:-arch_errors_fatal} \
 291    %{Zdead_strip:-dead_strip} \
 292    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 293    %{Zdylib_file*:-dylib_file %*} \
 294    %{Zdynamic:-dynamic}\
 295    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 296    %{Zflat_namespace:-flat_namespace} \
 297    %{headerpad_max_install_names*} \
 298    %{Zimage_base*:-image_base %*} \
 299    %{Zinit*:-init %*} \
 300    %{mmacosx-version-min=*:-macosx_version_min %*} \
 301    %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
 302    %{nomultidefs} \
 303    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 304    %{Zmultiply_defined*:-multiply_defined %*} \
 305    %{!Zmultiply_defined*:%{shared-libgcc: \
 306      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
 307      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
 308    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 309    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 310    %{read_only_relocs} \
 311    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 312    %{Zsegaddr*:-segaddr %*} \
 313    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 314    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 315    %{Zseg_addr_table*: -seg_addr_table %*} \
 316    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 317    %{sub_library*} %{sub_umbrella*} \
 318    " LINK_SYSROOT_SPEC " \
 319    %{twolevel_namespace} %{twolevel_namespace_hints} \
 320    %{Zumbrella*: -umbrella %*} \
 321    %{undefined*} \
 322    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 323    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 324    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 325    %{X} \
 326    %{y*} \
 327    %{w} \
 328    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 329    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 330    %{whatsloaded} %{dylinker_install_name*} \
 331    %{dylinker} %{Mach} "
 332
 333
 334 /* Machine dependent libraries.  */
 335
 336 #define LIB_SPEC "%{!static:-lSystem}"
 337
 338 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 339    libraries to link against, and by not linking against libgcc_s on
 340    earlier-than-10.3.9.
 341
 342    Note that by default, -lgcc_eh is not linked against!  This is
 343    because in a future version of Darwin the EH frame information may
 344    be in a new format, or the fallback routine might be changed; if
 345    you want to explicitly link against the static version of those
 346    routines, because you know you don't need to unwind through system
 347    libraries, you need to explicitly say -static-libgcc.
 348
 349    If it is linked against, it has to be before -lgcc, because it may
 350    need symbols from -lgcc.  */
 351 #undef REAL_LIBGCC_SPEC
 352 #define REAL_LIBGCC_SPEC                                                   \
 353    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 354       shared-libgcc|fexceptions:                                           \
 355        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 356        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 357        -lgcc;                                                              \
 358       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 359        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 360        -lgcc}"
 361
 362 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
 363
 364    crt3.o provides __cxa_atexit on systems that don't have it.  Since
 365    it's only used with C++, which requires passing -shared-libgcc, key
 366    off that to avoid unnecessarily adding a destructor to every
 367    powerpc program built.  */
 368
 369 #undef  STARTFILE_SPEC
 370 #define STARTFILE_SPEC                                                      \
 371   "%{Zdynamiclib: %(darwin_dylib1) }                                        \
 372    %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
 373      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
 374                      %{!static:%{object:-lgcrt0.o}                          \
 375                                %{!object:%{preload:-lgcrt0.o}               \
 376                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
 377                 %{!pg:%{static:-lcrt0.o}                                    \
 378                       %{!static:%{object:-lcrt0.o}                          \
 379                                 %{!object:%{preload:-lcrt0.o}               \
 380                                   %{!preload: %(darwin_crt1)  %(darwin_crt2)}}}}}}  \
 381   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
 382
 383 /* The native Darwin linker doesn't necessarily place files in the order
 384    that they're specified on the link line.  Thus, it is pointless
 385    to put anything in ENDFILE_SPEC.  */
 386 /* #define ENDFILE_SPEC "" */
 387
 388 #define DARWIN_EXTRA_SPECS     \
 389   { "darwin_crt1", DARWIN_CRT1_SPEC },                                 \
 390   { "darwin_dylib1", DARWIN_DYLIB1_SPEC },
 391
 392 #define DARWIN_DYLIB1_SPEC                                             \
 393   "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)          \
 394    %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
 395
 396 #define DARWIN_CRT1_SPEC                                               \
 397   "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)            \
 398    %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)"
 399
 400 /* Default Darwin ASM_SPEC, very simple.  */
 401 #define ASM_SPEC "-arch %(darwin_arch) \
 402   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
 403
 404 /* We still allow output of STABS.  */
 405
 406 #define DBX_DEBUGGING_INFO 1
 407
 408 #define DWARF2_DEBUGGING_INFO
 409 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 410
 411 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
 412 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
 413 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
 414 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
 415 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
 416 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
 417 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
 418 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
 419 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
 420 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
 421 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
 422
 423 /* When generating stabs debugging, use N_BINCL entries.  */
 424
 425 #define DBX_USE_BINCL
 426
 427 /* There is no limit to the length of stabs strings.  */
 428
 429 #define DBX_CONTIN_LENGTH 0
 430
 431 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 432
 433 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 434
 435 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 436 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 437
 438 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 439    sections.  machopic_select_section ensures that weak variables go in
 440    coalesced sections.  Weak aliases (or any other kind of aliases) are
 441    not supported.  Weak symbols that aren't visible outside the .s file
 442    are not supported.  */
 443 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 444   do {                                                                  \
 445     if (ALIAS)                                                          \
 446       {                                                                 \
 447         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 448         break;                                                          \
 449       }                                                                 \
 450                                                                         \
 451     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 452       targetm.asm_out.globalize_label (FILE, NAME);                     \
 453     if (DECL_EXTERNAL (DECL))                                           \
 454       fputs ("\t.weak_reference ", FILE);                               \
 455     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
 456         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
 457       break;                                                            \
 458     else if (TREE_PUBLIC (DECL))                                        \
 459       fputs ("\t.weak_definition ", FILE);                              \
 460     else                                                                \
 461       break;                                                            \
 462     assemble_name (FILE, NAME);                                         \
 463     fputc ('\n', FILE);                                                 \
 464   } while (0)
 465
 466 /* Darwin has the pthread routines in libSystem, which every program
 467    links to, so there's no need for weak-ness for that.  */
 468 #define GTHREAD_USE_WEAK 0
 469
 470 /* The Darwin linker imposes two limitations on common symbols: they
 471    can't have hidden visibility, and they can't appear in dylibs.  As
 472    a consequence, we should never use common symbols to represent
 473    vague linkage. */
 474 #undef USE_COMMON_FOR_ONE_ONLY
 475 #define USE_COMMON_FOR_ONE_ONLY 0
 476
 477 /* The Darwin linker doesn't want coalesced symbols to appear in
 478    a static archive's table of contents. */
 479 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 480 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 481
 482 /* On Darwin, we don't (at the time of writing) have linkonce sections
 483    with names, so it's safe to make the class data not comdat.  */
 484 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 485
 486 /* For efficiency, on Darwin the RTTI information that is always
 487    emitted in the standard C++ library should not be COMDAT.  */
 488 #define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
 489
 490 /* We make exception information linkonce. */
 491 #undef TARGET_USES_WEAK_UNWIND_INFO
 492 #define TARGET_USES_WEAK_UNWIND_INFO 1
 493
 494 /* We need to use a nonlocal label for the start of an EH frame: the
 495    Darwin linker requires that a coalesced section start with a label.
 496    Unfortunately, it also requires that 'debug' sections don't contain
 497    labels.  */
 498 #undef FRAME_BEGIN_LABEL
 499 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
 500
 501 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 502    emit a label for an empty FDE. */
 503 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 504
 505 /* Emit a label to separate the exception table.  */
 506 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 507
 508 /* Our profiling scheme doesn't LP labels and counter words.  */
 509
 510 #define NO_PROFILE_COUNTERS     1
 511
 512 #undef  INIT_SECTION_ASM_OP
 513 #define INIT_SECTION_ASM_OP
 514
 515 #undef  INVOKE__main
 516
 517 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 518 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 519
 520 /* Always prefix with an underscore.  */
 521
 522 #define USER_LABEL_PREFIX "_"
 523
 524 /* Don't output a .file directive.  That is only used by the assembler for
 525    error reporting.  */
 526 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 527 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 528
 529 #undef  TARGET_ASM_FILE_END
 530 #define TARGET_ASM_FILE_END darwin_file_end
 531
 532 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 533   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 534
 535 /* Give ObjC methods pretty symbol names.  */
 536
 537 #undef  OBJC_GEN_METHOD_LABEL
 538 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 539   do { if (CAT_NAME)                                                    \
 540          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 541                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 542        else                                                             \
 543          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 544                   (CLASS_NAME), (SEL_NAME));                            \
 545      } while (0)
 546
 547 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 548    but it does need to be referenced via indirect PIC data pointers.
 549    The machopic_define_symbol calls are telling the machopic subsystem
 550    that the name *is* defined in this module, so it doesn't need to
 551    make them indirect.  */
 552
 553 #undef ASM_DECLARE_OBJECT_NAME
 554 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 555   do {                                                                  \
 556     const char *xname = NAME;                                           \
 557     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 558       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 559     if (! DECL_WEAK (DECL)                                              \
 560         && ((TREE_STATIC (DECL)                                         \
 561              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 562             || DECL_INITIAL (DECL)))                                    \
 563         machopic_define_symbol (DECL_RTL (DECL));                       \
 564     if ((TREE_STATIC (DECL)                                             \
 565          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 566         || DECL_INITIAL (DECL))                                         \
 567       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 568     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 569     /* Darwin doesn't support zero-size objects, so give them a         \
 570        byte.  */                                                        \
 571     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
 572       assemble_zeros (1);                                               \
 573   } while (0)
 574
 575 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 576   do {                                                                  \
 577     const char *xname = NAME;                                           \
 578     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 579       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 580     if (! DECL_WEAK (DECL)                                              \
 581         && ((TREE_STATIC (DECL)                                         \
 582              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 583             || DECL_INITIAL (DECL)))                                    \
 584         machopic_define_symbol (DECL_RTL (DECL));                       \
 585     if ((TREE_STATIC (DECL)                                             \
 586          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 587         || DECL_INITIAL (DECL))                                         \
 588       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 589     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 590   } while (0)
 591
 592 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
 593   do {                                                          \
 594     ASM_OUTPUT_LABEL (FILE, NAME);                              \
 595     /* Darwin doesn't support zero-size objects, so give them a \
 596        byte.  */                                                \
 597     if ((SIZE) == 0)                                            \
 598       assemble_zeros (1);                                       \
 599   } while (0)
 600
 601 /* Wrap new method names in quotes so the assembler doesn't gag.
 602    Make Objective-C internal symbols local.  */
 603
 604 #undef  ASM_OUTPUT_LABELREF
 605 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 606   do {                                                                       \
 607        const char *xname = (NAME);                                           \
 608        if (! strcmp (xname, "<pic base>"))                                   \
 609          machopic_output_function_base_name(FILE);                           \
 610        else if (xname[0] == '&' || xname[0] == '*')                          \
 611          {                                                                   \
 612            int len = strlen (xname);                                         \
 613            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 614              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 615            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 616              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 617            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 618              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 619            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 620              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 621            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 622              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 623            else                                                              \
 624              fputs (&xname[1], FILE);                                        \
 625          }                                                                   \
 626        else if (xname[0] == '+' || xname[0] == '-')                          \
 627          fprintf (FILE, "\"%s\"", xname);                                    \
 628        else if (!strncmp (xname, "_OBJC_", 6))                               \
 629          fprintf (FILE, "L%s", xname);                                       \
 630        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
 631          fprintf (FILE, "%s", xname);                                        \
 632        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 633          fprintf (FILE, "\"%s\"", xname);                                    \
 634        else                                                                  \
 635          asm_fprintf (FILE, "%U%s", xname);                                  \
 636   } while (0)
 637
 638 /* Output before executable code.  */
 639 #undef TEXT_SECTION_ASM_OP
 640 #define TEXT_SECTION_ASM_OP "\t.text"
 641
 642 /* Output before writable data.  */
 643
 644 #undef DATA_SECTION_ASM_OP
 645 #define DATA_SECTION_ASM_OP "\t.data"
 646
 647 #undef  ALIGN_ASM_OP
 648 #define ALIGN_ASM_OP            ".align"
 649
 650 #undef  ASM_OUTPUT_ALIGN
 651 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 652   if ((LOG) != 0)                       \
 653     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
 654
 655 /* Ensure correct alignment of bss data.  */
 656
 657 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 658 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 659   do {                                                                  \
 660     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 661     fputs (".lcomm ", (FILE));                                          \
 662     assemble_name ((FILE), (NAME));                                     \
 663     if (_new_size == 0) _new_size = 1;                                  \
 664     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
 665              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
 666     if ((DECL) && ((TREE_STATIC (DECL)                                  \
 667          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 668         || DECL_INITIAL (DECL)))                                        \
 669       {                                                                 \
 670         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
 671         machopic_define_symbol (DECL_RTL (DECL));                       \
 672       }                                                                 \
 673   } while (0)
 674
 675 /* The maximum alignment which the object file format can support.
 676    For Mach-O, this is 2^15.  */
 677
 678 #undef  MAX_OFILE_ALIGNMENT
 679 #define MAX_OFILE_ALIGNMENT 0x8000
 680
 681 /* Declare the section variables.  */
 682 #ifndef USED_FOR_TARGET
 683 enum darwin_section_enum {
 684 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 685 #include "darwin-sections.def"
 686 #undef DEF_SECTION
 687   NUM_DARWIN_SECTIONS
 688 };
 689 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 690 #endif
 691
 692 #undef  TARGET_ASM_SELECT_SECTION
 693 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 694 #define USE_SELECT_SECTION_FOR_FUNCTIONS
 695
 696 #undef  TARGET_ASM_SELECT_RTX_SECTION
 697 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 698 #undef  TARGET_ASM_UNIQUE_SECTION
 699 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 700 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 701 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 702
 703
 704 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 705     do {                                                                \
 706          if (FILE) {                                                    \
 707            if (MACHOPIC_INDIRECT)                                       \
 708              fprintf (FILE, "\t.lazy_reference ");                      \
 709            else                                                         \
 710              fprintf (FILE, "\t.reference ");                           \
 711            assemble_name (FILE, NAME);                                  \
 712            fprintf (FILE, "\n");                                        \
 713          }                                                              \
 714        } while (0)
 715
 716 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 717     do {                                                                \
 718          if (FILE) {                                                    \
 719            fprintf (FILE, "\t");                                        \
 720            assemble_name (FILE, NAME);                                  \
 721            fprintf (FILE, "=0\n");                                      \
 722            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
 723          }                                                              \
 724        } while (0)
 725
 726 /* Globalizing directive for a label.  */
 727 #define GLOBAL_ASM_OP ".globl "
 728 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 729
 730 /* Emit an assembler directive to set visibility for a symbol.  Used
 731    to support visibility attribute and Darwin's private extern
 732    feature.  */
 733 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 734 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 735
 736 /* Extra attributes for Darwin.  */
 737 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 738   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 739   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
 740     darwin_handle_kext_attribute },                                          \
 741   { "weak_import", 0, 0, true, false, false,                                 \
 742     darwin_handle_weak_import_attribute }
 743
 744 #undef ASM_GENERATE_INTERNAL_LABEL
 745 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 746   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 747
 748 #undef TARGET_ASM_MARK_DECL_PRESERVED
 749 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 750
 751 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
 752    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
 753    variable has been defined in this translation unit.
 754    When porting Mach-O to new architectures you need to make
 755    sure these aren't clobbered by the backend.  */
 756
 757 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
 758 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 759
 760 /* Set on a symbol to indicate when fix-and-continue style code
 761    generation is being used and the symbol refers to a static symbol
 762    that should be rebound from new instances of a translation unit to
 763    the original instance of the data.  */
 764
 765 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 766
 767 /* Symbolic names for various things we might know about a symbol.  */
 768
 769 enum machopic_addr_class {
 770   MACHOPIC_UNDEFINED,
 771   MACHOPIC_DEFINED_DATA,
 772   MACHOPIC_UNDEFINED_DATA,
 773   MACHOPIC_DEFINED_FUNCTION,
 774   MACHOPIC_UNDEFINED_FUNCTION
 775 };
 776
 777 /* Macros defining the various PIC cases.  */
 778
 779 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
 780 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
 781 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
 782 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
 783
 784 #undef TARGET_ENCODE_SECTION_INFO
 785 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 786 #undef TARGET_STRIP_NAME_ENCODING
 787 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 788
 789 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 790   do {                                                          \
 791     const char *const stub_ = (STUB);                           \
 792     char *buffer_ = (BUF);                                      \
 793     strcpy (buffer_, stub_);                                    \
 794     if (stub_[0] == '"')                                        \
 795       {                                                         \
 796         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 797       }                                                         \
 798     else                                                        \
 799       {                                                         \
 800         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 801       }                                                         \
 802   } while (0)
 803
 804 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 805   do {                                                          \
 806     const char *const symbol_ = (SYMBOL);                       \
 807     char *buffer_ = (BUF);                                      \
 808     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 809       {                                                         \
 810           sprintf (buffer_, "\"%s\"", symbol_);                 \
 811       }                                                         \
 812     else                                                        \
 813       {                                                         \
 814         strcpy (buffer_, symbol_);                              \
 815       }                                                         \
 816   } while (0)
 817
 818 /* Given a symbol name string, create the lazy pointer version
 819    of the symbol name.  */
 820
 821 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 822   do {                                                          \
 823     const char *symbol_ = (SYMBOL);                             \
 824     char *buffer_ = (BUF);                                      \
 825     if (symbol_[0] == '"')                                      \
 826       {                                                         \
 827         strcpy (buffer_, "\"L");                                \
 828         strcpy (buffer_ + 2, symbol_ + 1);                      \
 829         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 830       }                                                         \
 831     else if (name_needs_quotes (symbol_))                       \
 832       {                                                         \
 833         strcpy (buffer_, "\"L");                                \
 834         strcpy (buffer_ + 2, symbol_);                          \
 835         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 836       }                                                         \
 837     else                                                        \
 838       {                                                         \
 839         strcpy (buffer_, "L");                                  \
 840         strcpy (buffer_ + 1, symbol_);                          \
 841         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 842       }                                                         \
 843   } while (0)
 844
 845 #define EH_FRAME_SECTION_NAME   "__TEXT"
 846 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
 847
 848 /* Java runtime class list.  */
 849 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 850
 851 #undef ASM_PREFERRED_EH_DATA_FORMAT
 852 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 853   (((CODE) == 2 && (GLOBAL) == 1) \
 854    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
 855      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 856
 857 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
 858   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
 859
 860 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
 861   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
 862
 863 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
 864       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
 865         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
 866         goto DONE;                                                                      \
 867       }
 868
 869 /* Experimentally, putting jump tables in text is faster on SPEC.
 870    Also this is needed for correctness for coalesced functions.  */
 871
 872 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 873 #define JUMP_TABLES_IN_TEXT_SECTION 1
 874 #endif
 875
 876 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
 877
 878 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
 879 #undef TARGET_ASM_NAMED_SECTION
 880 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
 881
 882 /* Handle pragma weak and pragma pack.  */
 883 #define HANDLE_SYSV_PRAGMA 1
 884
 885 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 886
 887 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
 888   do {                                                          \
 889     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
 890     c_register_pragma (0, "options", darwin_pragma_options);    \
 891     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
 892     c_register_pragma (0, "unused", darwin_pragma_unused);      \
 893     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
 894   } while (0)
 895
 896 #undef ASM_APP_ON
 897 #define ASM_APP_ON ""
 898 #undef ASM_APP_OFF
 899 #define ASM_APP_OFF ""
 900
 901 void darwin_register_frameworks (const char *, const char *, int);
 902 void darwin_register_objc_includes (const char *, const char *, int);
 903 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
 904 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
 905
 906 void add_framework_path (char *);
 907 #define TARGET_OPTF add_framework_path
 908
 909 #define TARGET_POSIX_IO
 910
 911 /* All new versions of Darwin have C99 functions.  */
 912
 913 #define TARGET_C99_FUNCTIONS 1
 914
 915 #define WINT_TYPE "int"
 916
 917 /* Every program on darwin links against libSystem which contains the pthread
 918    routines, so there's no need to explicitly call out when doing threaded
 919    work.  */
 920
 921 #undef GOMP_SELF_SPECS
 922 #define GOMP_SELF_SPECS ""
 923
 924 /* Darwin can't support anchors until we can cope with the adjustments
 925    to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
 926    when outputting members of an anchor block and the linker can be
 927    taught to keep them together or we find some other suitable
 928    code-gen technique.  */
 929
 930 #if 0
 931 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 932 #else
 933 #define TARGET_ASM_OUTPUT_ANCHOR NULL
 934 #endif
 935
 936 /* Attempt to turn on execute permission for the stack.  This may be
 937     used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
 938     if the target machine can change execute permissions on a page).
 939
 940     There is no way to query the execute permission of the stack, so
 941     we always issue the mprotect() call.
 942
 943     Unfortunately it is not possible to make this namespace-clean.
 944
 945     Also note that no errors should be emitted by this code; it is
 946     considered dangerous for library calls to send messages to
 947     stdout/stderr.  */
 948
 949 #define ENABLE_EXECUTE_STACK                                            \
 950 extern void __enable_execute_stack (void *);                            \
 951 void                                                                    \
 952 __enable_execute_stack (void *addr)                                     \
 953 {                                                                       \
 954    extern int mprotect (void *, size_t, int);                           \
 955    extern int getpagesize (void);                                       \
 956    static int size;                                                     \
 957    static long mask;                                                    \
 958                                                                         \
 959    char *page, *end;                                                    \
 960                                                                         \
 961    if (size == 0)                                                       \
 962      {                                                                  \
 963        size = getpagesize();                                            \
 964        mask = ~((long) size - 1);                                       \
 965      }                                                                  \
 966                                                                         \
 967    page = (char *) (((long) addr) & mask);                              \
 968    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
 969                                                                         \
 970    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
 971    (void) mprotect (page, end - page, 7);                               \
 972 }
 973
 974 /* For Apple KEXTs, we make the constructors return this to match gcc
 975    2.95.  */
 976 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
 977 extern int flag_mkernel;
 978 extern int flag_apple_kext;
 979 #define TARGET_KEXTABI flag_apple_kext
 980
 981 #endif /* CONFIG_DARWIN_H */