gcc/config/darwin.h

   1 /* Target definitions for Darwin (Mac OS X) systems.
   2    Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
   3    2005
   4    Free Software Foundation, Inc.
   5    Contributed by Apple Computer Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  22 Boston, MA 02110-1301, USA.  */
  23
  24 #ifndef CONFIG_DARWIN_H
  25 #define CONFIG_DARWIN_H
  26
  27 /* The definitions in this file are common to all processor types
  28    running Darwin, which is the kernel for Mac OS X.  Darwin is
  29    basically a BSD user layer laid over a Mach kernel, then evolved
  30    for many years (at NeXT) in parallel with other Unix systems.  So
  31    while the runtime is a somewhat idiosyncratic Mach-based thing,
  32    other definitions look like they would for a BSD variant.  */
  33
  34 /* Although NeXT ran on many different architectures, as of Jan 2001
  35    the only supported Darwin targets are PowerPC and x86.  */
  36
  37 /* One of Darwin's NeXT legacies is the Mach-O format, which is partly
  38    like a.out and partly like COFF, with additional features like
  39    multi-architecture binary support.  */
  40
  41 #define OBJECT_FORMAT_MACHO
  42
  43 /* Suppress g++ attempt to link in the math library automatically. */
  44 #define MATH_LIBRARY ""
  45
  46 /* We have atexit.  */
  47
  48 #define HAVE_ATEXIT
  49
  50 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
  51
  52 #define DO_GLOBAL_DTORS_BODY
  53
  54 /* The string value for __SIZE_TYPE__.  */
  55
  56 #ifndef SIZE_TYPE
  57 #define SIZE_TYPE "long unsigned int"
  58 #endif
  59
  60 /* Type used for ptrdiff_t, as a string used in a declaration.  */
  61
  62 #undef  PTRDIFF_TYPE
  63 #define PTRDIFF_TYPE "int"
  64
  65 /* wchar_t is int.  */
  66
  67 #undef  WCHAR_TYPE
  68 #define WCHAR_TYPE "int"
  69 #undef  WCHAR_TYPE_SIZE
  70 #define WCHAR_TYPE_SIZE 32
  71
  72 /* Default to using the NeXT-style runtime, since that's what is
  73    pre-installed on Darwin systems.  */
  74
  75 #define NEXT_OBJC_RUNTIME
  76
  77 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  78    we want to retain compatibility with older gcc versions.  */
  79
  80 #undef  DEFAULT_PCC_STRUCT_RETURN
  81 #define DEFAULT_PCC_STRUCT_RETURN 0
  82
  83 /* This table intercepts weirdo options whose names would interfere
  84    with normal driver conventions, and either translates them into
  85    standardly-named options, or adds a 'Z' so that they can get to
  86    specs processing without interference.
  87
  88    Do not expand a linker option to "-Xlinker -<option>", since that
  89    forfeits the ability to control via spec strings later.  However,
  90    as a special exception, do this translation with -filelist, because
  91    otherwise the driver will think there are no input files and quit.
  92    (The alternative would be to hack the driver to recognize -filelist
  93    specially, but it's simpler to use the translation table.)
  94
  95    Note that an option name with a prefix that matches another option
  96    name, that also takes an argument, needs to be modified so the
  97    prefix is different, otherwise a '*' after the shorter option will
  98    match with the longer one.
  99
 100    The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined
 101    in gcc/config/{i386,rs6000}/darwin.h, should contain any additional
 102    command-line option translations specific to the particular target
 103    architecture.  */
 104
 105 #define TARGET_OPTION_TRANSLATE_TABLE \
 106   { "-all_load", "-Zall_load" },  \
 107   { "-allowable_client", "-Zallowable_client" },  \
 108   { "-arch_errors_fatal", "-Zarch_errors_fatal" },  \
 109   { "-bind_at_load", "-Zbind_at_load" },  \
 110   { "-bundle", "-Zbundle" },  \
 111   { "-bundle_loader", "-Zbundle_loader" },  \
 112   { "-weak_reference_mismatches", "-Zweak_reference_mismatches" },  \
 113   { "-dead_strip", "-Zdead_strip" }, \
 114   { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \
 115   { "-dependency-file", "-MF" }, \
 116   { "-dylib_file", "-Zdylib_file" }, \
 117   { "-dynamic", "-Zdynamic" },  \
 118   { "-dynamiclib", "-Zdynamiclib" },  \
 119   { "-exported_symbols_list", "-Zexported_symbols_list" },  \
 120   { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \
 121   { "-gused", "-g -feliminate-unused-debug-symbols" }, \
 122   { "-segaddr", "-Zsegaddr" }, \
 123   { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \
 124   { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \
 125   { "-seg_addr_table", "-Zseg_addr_table" }, \
 126   { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \
 127   { "-filelist", "-Xlinker -filelist -Xlinker" },  \
 128   { "-framework", "-Xlinker -framework -Xlinker" },  \
 129   { "-flat_namespace", "-Zflat_namespace" },  \
 130   { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
 131   { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
 132   { "-image_base", "-Zimage_base" },  \
 133   { "-init", "-Zinit" },  \
 134   { "-install_name", "-Zinstall_name" },  \
 135   { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
 136   { "-multiply_defined", "-Zmultiply_defined" },  \
 137   { "-multi_module", "-Zmulti_module" },  \
 138   { "-static", "-static -Wa,-static" },  \
 139   { "-single_module", "-Zsingle_module" },  \
 140   { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
 141   SUBTARGET_OPTION_TRANSLATE_TABLE
 142
 143 /* These compiler options take n arguments.  */
 144
 145 #undef  WORD_SWITCH_TAKES_ARG
 146 #define WORD_SWITCH_TAKES_ARG(STR)              \
 147   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
 148    !strcmp (STR, "Zallowable_client") ? 1 :     \
 149    !strcmp (STR, "arch") ? 1 :                  \
 150    !strcmp (STR, "arch_only") ? 1 :             \
 151    !strcmp (STR, "Zbundle_loader") ? 1 :        \
 152    !strcmp (STR, "client_name") ? 1 :           \
 153    !strcmp (STR, "compatibility_version") ? 1 : \
 154    !strcmp (STR, "current_version") ? 1 :       \
 155    !strcmp (STR, "Zdylib_file") ? 1 :           \
 156    !strcmp (STR, "Zexported_symbols_list") ? 1 : \
 157    !strcmp (STR, "Zimage_base") ? 1 :           \
 158    !strcmp (STR, "Zinit") ? 1 :                 \
 159    !strcmp (STR, "Zinstall_name") ? 1 :         \
 160    !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
 161    !strcmp (STR, "Zmultiply_defined") ? 1 :     \
 162    !strcmp (STR, "precomp-trustfile") ? 1 :     \
 163    !strcmp (STR, "read_only_relocs") ? 1 :      \
 164    !strcmp (STR, "sectcreate") ? 3 :            \
 165    !strcmp (STR, "sectorder") ? 3 :             \
 166    !strcmp (STR, "Zsegaddr") ? 2 :              \
 167    !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
 168    !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
 169    !strcmp (STR, "Zseg_addr_table") ? 1 :       \
 170    !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
 171    !strcmp (STR, "seg1addr") ? 1 :              \
 172    !strcmp (STR, "segprot") ? 3 :               \
 173    !strcmp (STR, "sub_library") ? 1 :           \
 174    !strcmp (STR, "sub_umbrella") ? 1 :          \
 175    !strcmp (STR, "umbrella") ? 1 :              \
 176    !strcmp (STR, "undefined") ? 1 :             \
 177    !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
 178    !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
 179    !strcmp (STR, "pagezero_size") ? 1 :         \
 180    !strcmp (STR, "segs_read_only_addr") ? 1 :   \
 181    !strcmp (STR, "segs_read_write_addr") ? 1 :  \
 182    !strcmp (STR, "sectalign") ? 3 :             \
 183    !strcmp (STR, "sectobjectsymbols") ? 2 :     \
 184    !strcmp (STR, "segcreate") ? 3 :             \
 185    !strcmp (STR, "dylinker_install_name") ? 1 : \
 186    0)
 187
 188 /* Machine dependent cpp options.  Don't add more options here, add
 189    them to darwin_cpp_builtins in darwin-c.c.  */
 190
 191 #undef  CPP_SPEC
 192 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}"
 193
 194 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
 195    precomp, libtool, and fat build additions.  Also we
 196    don't specify a second %G after %L because libSystem is
 197    self-contained and doesn't need to link against libgcc.a.  */
 198 /* In general, random Darwin linker flags should go into LINK_SPEC
 199    instead of LINK_COMMAND_SPEC.  The command spec is better for
 200    specifying the handling of options understood by generic Unix
 201    linkers, and for positional arguments like libraries.  */
 202 #define LINK_COMMAND_SPEC "\
 203 %{!fdump=*:%{!fsyntax-only:%{!precomp:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 204     %{!Zdynamiclib:%(linker)}%{Zdynamiclib:/usr/bin/libtool} \
 205     %l %X %{d} %{s} %{t} %{Z} \
 206     %{!Zdynamiclib:%{A} %{e*} %{m} %{N} %{n} %{r} %{u*} %{x} %{z}} \
 207     %{@:-o %f%u.out}%{!@:%{o*}%{!o:-o a.out}} \
 208     %{!Zdynamiclib:%{!A:%{!nostdlib:%{!nostartfiles:%S}}}} \
 209     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
 210     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
 211     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
 212     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}}"
 213
 214 /* Please keep the random linker options in alphabetical order (modulo
 215    'Z' and 'no' prefixes).  Options that can only go to one of libtool
 216    or ld must be listed twice, under both !Zdynamiclib and
 217    Zdynamiclib, with one of the cases reporting an error.  */
 218 /* Note that options taking arguments may appear multiple times on a
 219    command line with different arguments each time, so put a * after
 220    their names so all of them get passed.  */
 221 #define LINK_SPEC  \
 222   "%{static}%{!static:-dynamic} \
 223    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
 224    %{!Zdynamiclib: \
 225      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 226      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 227      %{Zbundle:-bundle} \
 228      %{Zbundle_loader*:-bundle_loader %*} \
 229      %{client_name*} \
 230      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 231 } \
 232      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 233      %{Zforce_flat_namespace:-force_flat_namespace} \
 234      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 235      %{keep_private_externs} \
 236      %{private_bundle} \
 237     } \
 238    %{Zdynamiclib: \
 239      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 240      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 241      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 242      %{compatibility_version*} \
 243      %{current_version*} \
 244      %{Zforce_cpusubtype_ALL:-arch_only %(darwin_arch)} \
 245      %{!Zforce_cpusubtype_ALL: -arch_only %(darwin_subarch)} \
 246      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 247      %{Zinstall_name*:-install_name %*} \
 248      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 249      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 250     } \
 251    %{Zall_load:-all_load}%{Zdynamiclib:%{!Zall_load:-noall_load}} \
 252    %{Zallowable_client*:-allowable_client %*} \
 253    %{Zbind_at_load:-bind_at_load} \
 254    %{Zarch_errors_fatal:-arch_errors_fatal} \
 255    %{Zdead_strip:-dead_strip} \
 256    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 257    %{Zdylib_file*:-dylib_file %*} \
 258    %{Zdynamic:-dynamic}\
 259    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 260    %{Zflat_namespace:-flat_namespace} \
 261    %{headerpad_max_install_names*} \
 262    %{Zimage_base*:-image_base %*} \
 263    %{Zinit*:-init %*} \
 264    %{mmacosx-version-min=*:-macosx_version_min %*} \
 265    %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
 266    %{nomultidefs} \
 267    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 268    %{Zmultiply_defined*:-multiply_defined %*} \
 269    %{!Zmultiply_defined*:%{shared-libgcc: \
 270      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
 271      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
 272    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 273    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 274    %{read_only_relocs} \
 275    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 276    %{Zsegaddr*:-segaddr %*} \
 277    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 278    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 279    %{Zseg_addr_table*: -seg_addr_table %*} \
 280    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 281    %{sub_library*} %{sub_umbrella*} \
 282    %{isysroot*:-syslibroot %*} \
 283    %{twolevel_namespace} %{twolevel_namespace_hints} \
 284    %{umbrella*} \
 285    %{undefined*} \
 286    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 287    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 288    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 289    %{X} \
 290    %{y*} \
 291    %{w} \
 292    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 293    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 294    %{whatsloaded} %{dylinker_install_name*} \
 295    %{dylinker} %{Mach} "
 296
 297
 298 /* Machine dependent libraries.  */
 299
 300 #define LIB_SPEC "%{!static:-lSystem}"
 301
 302 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 303    libraries to link against, and by not linking against libgcc_s on
 304    earlier-than-10.3.9.
 305
 306    Note that by default, -lgcc_eh is not linked against!  This is
 307    because in a future version of Darwin the EH frame information may
 308    be in a new format, or the fallback routine might be changed; if
 309    you want to explicitly link against the static version of those
 310    routines, because you know you don't need to unwind through system
 311    libraries, you need to explicitly say -static-libgcc.
 312
 313    If it is linked against, it has to be before -lgcc, because it may
 314    need symbols from -lgcc.  */
 315 #undef REAL_LIBGCC_SPEC
 316 #define REAL_LIBGCC_SPEC                                                   \
 317    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 318       shared-libgcc|fexceptions:                                           \
 319        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 320        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 321        -lgcc;                                                              \
 322       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 323        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 324        -lgcc}"
 325
 326 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
 327
 328    crt3.o provides __cxa_atexit on systems that don't have it.  Since
 329    it's only used with C++, which requires passing -shared-libgcc, key
 330    off that to avoid unnecessarily adding a destructor to every
 331    powerpc program built.  */
 332
 333 #undef  STARTFILE_SPEC
 334 #define STARTFILE_SPEC                                                      \
 335   "%{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
 336      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
 337                      %{!static:%{object:-lgcrt0.o}                          \
 338                                %{!object:%{preload:-lgcrt0.o}               \
 339                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
 340                 %{!pg:%{static:-lcrt0.o}                                    \
 341                       %{!static:%{object:-lcrt0.o}                          \
 342                                 %{!object:%{preload:-lcrt0.o}               \
 343                                   %{!preload:-lcrt1.o %(darwin_crt2)}}}}}}  \
 344   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= -lcrt3.o)}"
 345
 346 /* The native Darwin linker doesn't necessarily place files in the order
 347    that they're specified on the link line.  Thus, it is pointless
 348    to put anything in ENDFILE_SPEC.  */
 349 /* #define ENDFILE_SPEC "" */
 350
 351 /* Default Darwin ASM_SPEC, very simple.  */
 352 #define ASM_SPEC "-arch %(darwin_arch) \
 353   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
 354
 355 /* We use Dbx symbol format.  */
 356
 357 #define DBX_DEBUGGING_INFO 1
 358
 359 /* Also enable Dwarf 2 as an option.  */
 360 #define DWARF2_DEBUGGING_INFO
 361 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 362
 363 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
 364 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
 365 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
 366 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
 367 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
 368 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
 369 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
 370 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
 371 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
 372 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
 373
 374 /* When generating stabs debugging, use N_BINCL entries.  */
 375
 376 #define DBX_USE_BINCL
 377
 378 /* There is no limit to the length of stabs strings.  */
 379
 380 #define DBX_CONTIN_LENGTH 0
 381
 382 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 383
 384 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 385
 386 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 387 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 388
 389 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 390    sections.  machopic_select_section ensures that weak variables go in
 391    coalesced sections.  Weak aliases (or any other kind of aliases) are
 392    not supported.  Weak symbols that aren't visible outside the .s file
 393    are not supported.  */
 394 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 395   do {                                                                  \
 396     if (ALIAS)                                                          \
 397       {                                                                 \
 398         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 399         break;                                                          \
 400       }                                                                 \
 401                                                                         \
 402     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 403       targetm.asm_out.globalize_label (FILE, NAME);                     \
 404     if (DECL_EXTERNAL (DECL))                                           \
 405       fputs ("\t.weak_reference ", FILE);                               \
 406     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
 407         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
 408       break;                                                            \
 409     else if (TREE_PUBLIC (DECL))                                        \
 410       fputs ("\t.weak_definition ", FILE);                              \
 411     else                                                                \
 412       break;                                                            \
 413     assemble_name (FILE, NAME);                                         \
 414     fputc ('\n', FILE);                                                 \
 415   } while (0)
 416
 417 /* Darwin has the pthread routines in libSystem, which every program
 418    links to, so there's no need for weak-ness for that.  */
 419 #define GTHREAD_USE_WEAK 0
 420
 421 /* The Darwin linker imposes two limitations on common symbols: they
 422    can't have hidden visibility, and they can't appear in dylibs.  As
 423    a consequence, we should never use common symbols to represent
 424    vague linkage. */
 425 #undef USE_COMMON_FOR_ONE_ONLY
 426 #define USE_COMMON_FOR_ONE_ONLY 0
 427
 428 /* The Darwin linker doesn't want coalesced symbols to appear in
 429    a static archive's table of contents. */
 430 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 431 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 432
 433 /* On Darwin, we don't (at the time of writing) have linkonce sections
 434    with names, so it's safe to make the class data not comdat.  */
 435 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 436
 437 /* We make exception information linkonce. */
 438 #undef TARGET_USES_WEAK_UNWIND_INFO
 439 #define TARGET_USES_WEAK_UNWIND_INFO 1
 440
 441 /* We need to use a nonlocal label for the start of an EH frame: the
 442    Darwin linker requires that a coalesced section start with a label.
 443    Unfortunately, it also requires that 'debug' sections don't contain
 444    labels.  */
 445 #undef FRAME_BEGIN_LABEL
 446 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
 447
 448 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 449    emit a label for an empty FDE. */
 450 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 451
 452 /* Emit a label to separate the exception table.  */
 453 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 454
 455 /* Our profiling scheme doesn't LP labels and counter words.  */
 456
 457 #define NO_PROFILE_COUNTERS     1
 458
 459 #undef  INIT_SECTION_ASM_OP
 460 #define INIT_SECTION_ASM_OP
 461
 462 #undef  INVOKE__main
 463
 464 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 465 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 466
 467 /* Always prefix with an underscore.  */
 468
 469 #define USER_LABEL_PREFIX "_"
 470
 471 /* Don't output a .file directive.  That is only used by the assembler for
 472    error reporting.  */
 473 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 474 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 475
 476 #undef  TARGET_ASM_FILE_END
 477 #define TARGET_ASM_FILE_END darwin_file_end
 478
 479 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 480   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 481
 482 /* Give ObjC methods pretty symbol names.  */
 483
 484 #undef  OBJC_GEN_METHOD_LABEL
 485 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 486   do { if (CAT_NAME)                                                    \
 487          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 488                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 489        else                                                             \
 490          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 491                   (CLASS_NAME), (SEL_NAME));                            \
 492      } while (0)
 493
 494 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 495    but it does need to be referenced via indirect PIC data pointers.
 496    The machopic_define_symbol calls are telling the machopic subsystem
 497    that the name *is* defined in this module, so it doesn't need to
 498    make them indirect.  */
 499
 500 #undef ASM_DECLARE_OBJECT_NAME
 501 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 502   do {                                                                  \
 503     const char *xname = NAME;                                           \
 504     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 505       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 506     if (! DECL_WEAK (DECL)                                              \
 507         && ((TREE_STATIC (DECL)                                         \
 508              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 509             || DECL_INITIAL (DECL)))                                    \
 510         machopic_define_symbol (DECL_RTL (DECL));                       \
 511     if ((TREE_STATIC (DECL)                                             \
 512          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 513         || DECL_INITIAL (DECL))                                         \
 514       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 515     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 516     /* Darwin doesn't support zero-size objects, so give them a         \
 517        byte.  */                                                        \
 518     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
 519       assemble_zeros (1);                                               \
 520   } while (0)
 521
 522 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 523   do {                                                                  \
 524     const char *xname = NAME;                                           \
 525     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 526       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 527     if (! DECL_WEAK (DECL)                                              \
 528         && ((TREE_STATIC (DECL)                                         \
 529              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 530             || DECL_INITIAL (DECL)))                                    \
 531         machopic_define_symbol (DECL_RTL (DECL));                       \
 532     if ((TREE_STATIC (DECL)                                             \
 533          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 534         || DECL_INITIAL (DECL))                                         \
 535       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 536     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 537   } while (0)
 538
 539 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
 540   do {                                                          \
 541     ASM_OUTPUT_LABEL (FILE, NAME);                              \
 542     /* Darwin doesn't support zero-size objects, so give them a \
 543        byte.  */                                                \
 544     if ((SIZE) == 0)                                            \
 545       assemble_zeros (1);                                       \
 546   } while (0)
 547
 548 /* Wrap new method names in quotes so the assembler doesn't gag.
 549    Make Objective-C internal symbols local.  */
 550
 551 #undef  ASM_OUTPUT_LABELREF
 552 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 553   do {                                                                       \
 554        const char *xname = (NAME);                                           \
 555        if (! strcmp (xname, "<pic base>"))                                   \
 556          machopic_output_function_base_name(FILE);                           \
 557        else if (xname[0] == '&' || xname[0] == '*')                          \
 558          {                                                                   \
 559            int len = strlen (xname);                                         \
 560            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 561              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 562            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 563              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 564            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 565              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 566            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 567              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 568            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 569              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 570            else                                                              \
 571              fputs (&xname[1], FILE);                                        \
 572          }                                                                   \
 573        else if (xname[0] == '+' || xname[0] == '-')                          \
 574          fprintf (FILE, "\"%s\"", xname);                                    \
 575        else if (!strncmp (xname, "_OBJC_", 6))                               \
 576          fprintf (FILE, "L%s", xname);                                       \
 577        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
 578          fprintf (FILE, "%s", xname);                                        \
 579        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 580          fprintf (FILE, "\"%s\"", xname);                                    \
 581        else                                                                  \
 582          asm_fprintf (FILE, "%U%s", xname);                                  \
 583   } while (0)
 584
 585 /* Output before executable code.  */
 586 #undef TEXT_SECTION_ASM_OP
 587 #define TEXT_SECTION_ASM_OP "\t.text"
 588
 589 /* Output before writable data.  */
 590
 591 #undef DATA_SECTION_ASM_OP
 592 #define DATA_SECTION_ASM_OP "\t.data"
 593
 594 #undef  ALIGN_ASM_OP
 595 #define ALIGN_ASM_OP            ".align"
 596
 597 #undef  ASM_OUTPUT_ALIGN
 598 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 599   if ((LOG) != 0)                       \
 600     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
 601
 602 /* Ensure correct alignment of bss data.  */
 603
 604 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 605 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 606   do {                                                                  \
 607     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 608     fputs (".lcomm ", (FILE));                                          \
 609     assemble_name ((FILE), (NAME));                                     \
 610     if (_new_size == 0) _new_size = 1;                                  \
 611     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
 612              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
 613     if ((DECL) && ((TREE_STATIC (DECL)                                  \
 614          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 615         || DECL_INITIAL (DECL)))                                        \
 616       {                                                                 \
 617         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
 618         machopic_define_symbol (DECL_RTL (DECL));                       \
 619       }                                                                 \
 620   } while (0)
 621
 622 /* The maximum alignment which the object file format can support.
 623    For Mach-O, this is 2^15.  */
 624
 625 #undef  MAX_OFILE_ALIGNMENT
 626 #define MAX_OFILE_ALIGNMENT 0x8000
 627
 628 /* Declare the section variables.  */
 629 #ifndef USED_FOR_TARGET
 630 enum darwin_section_enum {
 631 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 632 #include "darwin-sections.def"
 633 #undef DEF_SECTION
 634   NUM_DARWIN_SECTIONS
 635 };
 636 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 637 #endif
 638
 639 #undef  TARGET_ASM_SELECT_SECTION
 640 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 641 #define USE_SELECT_SECTION_FOR_FUNCTIONS
 642
 643 #undef  TARGET_ASM_SELECT_RTX_SECTION
 644 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 645 #undef  TARGET_ASM_UNIQUE_SECTION
 646 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 647 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 648 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 649
 650
 651 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 652     do {                                                                \
 653          if (FILE) {                                                    \
 654            if (MACHOPIC_INDIRECT)                                       \
 655              fprintf (FILE, "\t.lazy_reference ");                      \
 656            else                                                         \
 657              fprintf (FILE, "\t.reference ");                           \
 658            assemble_name (FILE, NAME);                                  \
 659            fprintf (FILE, "\n");                                        \
 660          }                                                              \
 661        } while (0)
 662
 663 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 664     do {                                                                \
 665          if (FILE) {                                                    \
 666            fprintf (FILE, "\t");                                        \
 667            assemble_name (FILE, NAME);                                  \
 668            fprintf (FILE, "=0\n");                                      \
 669            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
 670          }                                                              \
 671        } while (0)
 672
 673 /* Globalizing directive for a label.  */
 674 #define GLOBAL_ASM_OP ".globl "
 675 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 676
 677 /* Emit an assembler directive to set visibility for a symbol.  Used
 678    to support visibility attribute and Darwin's private extern
 679    feature.  */
 680 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 681 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 682
 683 /* Extra attributes for Darwin.  */
 684 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 685   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 686   { "weak_import", 0, 0, true, false, false,                                 \
 687     darwin_handle_weak_import_attribute }
 688
 689 #undef ASM_GENERATE_INTERNAL_LABEL
 690 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 691   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 692
 693 #undef TARGET_ASM_MARK_DECL_PRESERVED
 694 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 695
 696 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
 697    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
 698    variable has been defined in this translation unit.  */
 699
 700 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
 701 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 702
 703 /* Set on a symbol to indicate when fix-and-continue style code
 704    generation is being used and the symbol refers to a static symbol
 705    that should be rebound from new instances of a translation unit to
 706    the original instance of the data.  */
 707
 708 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 709
 710 /* Symbolic names for various things we might know about a symbol.  */
 711
 712 enum machopic_addr_class {
 713   MACHOPIC_UNDEFINED,
 714   MACHOPIC_DEFINED_DATA,
 715   MACHOPIC_UNDEFINED_DATA,
 716   MACHOPIC_DEFINED_FUNCTION,
 717   MACHOPIC_UNDEFINED_FUNCTION
 718 };
 719
 720 /* Macros defining the various PIC cases.  */
 721
 722 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
 723 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
 724 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
 725 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
 726
 727 #undef TARGET_ENCODE_SECTION_INFO
 728 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 729 #undef TARGET_STRIP_NAME_ENCODING
 730 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 731
 732 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 733   do {                                                          \
 734     const char *const stub_ = (STUB);                           \
 735     char *buffer_ = (BUF);                                      \
 736     strcpy (buffer_, stub_);                                    \
 737     if (stub_[0] == '"')                                        \
 738       {                                                         \
 739         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 740       }                                                         \
 741     else                                                        \
 742       {                                                         \
 743         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 744       }                                                         \
 745   } while (0)
 746
 747 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 748   do {                                                          \
 749     const char *const symbol_ = (SYMBOL);                       \
 750     char *buffer_ = (BUF);                                      \
 751     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 752       {                                                         \
 753           sprintf (buffer_, "\"%s\"", symbol_);                 \
 754       }                                                         \
 755     else                                                        \
 756       {                                                         \
 757         strcpy (buffer_, symbol_);                              \
 758       }                                                         \
 759   } while (0)
 760
 761 /* Given a symbol name string, create the lazy pointer version
 762    of the symbol name.  */
 763
 764 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 765   do {                                                          \
 766     const char *symbol_ = (SYMBOL);                             \
 767     char *buffer_ = (BUF);                                      \
 768     if (symbol_[0] == '"')                                      \
 769       {                                                         \
 770         strcpy (buffer_, "\"L");                                \
 771         strcpy (buffer_ + 2, symbol_ + 1);                      \
 772         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 773       }                                                         \
 774     else if (name_needs_quotes (symbol_))                       \
 775       {                                                         \
 776         strcpy (buffer_, "\"L");                                \
 777         strcpy (buffer_ + 2, symbol_);                          \
 778         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 779       }                                                         \
 780     else                                                        \
 781       {                                                         \
 782         strcpy (buffer_, "L");                                  \
 783         strcpy (buffer_ + 1, symbol_);                          \
 784         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 785       }                                                         \
 786   } while (0)
 787
 788 #define EH_FRAME_SECTION_NAME   "__TEXT"
 789 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
 790
 791 /* Java runtime class list.  */
 792 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 793
 794 #undef ASM_PREFERRED_EH_DATA_FORMAT
 795 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 796   (((CODE) == 2 && (GLOBAL) == 1) \
 797    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
 798      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 799
 800 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
 801   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
 802
 803 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
 804   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
 805
 806 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
 807       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
 808         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
 809         goto DONE;                                                                      \
 810       }
 811
 812 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 813
 814 /* Experimentally, putting jump tables in text is faster on SPEC.
 815    Also this is needed for correctness for coalesced functions.  */
 816
 817 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 818 #define JUMP_TABLES_IN_TEXT_SECTION 1
 819 #endif
 820
 821 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
 822
 823 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
 824 #undef TARGET_ASM_NAMED_SECTION
 825 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
 826
 827 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
 828   do {                                                          \
 829     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
 830     c_register_pragma (0, "options", darwin_pragma_options);    \
 831     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
 832     c_register_pragma (0, "unused", darwin_pragma_unused);      \
 833   } while (0)
 834
 835 #undef ASM_APP_ON
 836 #define ASM_APP_ON ""
 837 #undef ASM_APP_OFF
 838 #define ASM_APP_OFF ""
 839
 840 void darwin_register_frameworks (const char *, const char *, int);
 841 void darwin_register_objc_includes (const char *, const char *, int);
 842 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
 843 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
 844
 845 void add_framework_path (char *);
 846 #define TARGET_OPTF add_framework_path
 847
 848 #define TARGET_POSIX_IO
 849
 850 /* All new versions of Darwin have C99 functions.  */
 851 #define TARGET_C99_FUNCTIONS 1
 852
 853 #define WINT_TYPE "int"
 854
 855 /* Every program on darwin links against libSystem which contains the pthread
 856    routines, so there's no need to explicitly call out when doing threaded
 857    work.  */
 858 #undef GOMP_SELF_SPECS
 859 #define GOMP_SELF_SPECS ""
 860
 861 #endif /* CONFIG_DARWIN_H */