darwin.h revision 260573
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 7This file is part of GCC. 8 9GCC is free software; you can redistribute it and/or modify 10it under the terms of the GNU General Public License as published by 11the Free Software Foundation; either version 2, or (at your option) 12any later version. 13 14GCC is distributed in the hope that it will be useful, 15but WITHOUT ANY WARRANTY; without even the implied warranty of 16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17GNU General Public License for more details. 18 19You should have received a copy of the GNU General Public License 20along with GCC; see the file COPYING. If not, write to 21the Free Software Foundation, 51 Franklin Street, Fifth Floor, 22Boston, 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/* True if pragma ms_struct is in effect. */ 84extern GTY(()) int darwin_ms_struct; 85 86/* This table intercepts weirdo options whose names would interfere 87 with normal driver conventions, and either translates them into 88 standardly-named options, or adds a 'Z' so that they can get to 89 specs processing without interference. 90 91 Do not expand a linker option to "-Xlinker -<option>", since that 92 forfeits the ability to control via spec strings later. However, 93 as a special exception, do this translation with -filelist, because 94 otherwise the driver will think there are no input files and quit. 95 (The alternative would be to hack the driver to recognize -filelist 96 specially, but it's simpler to use the translation table.) 97 98 Note that an option name with a prefix that matches another option 99 name, that also takes an argument, needs to be modified so the 100 prefix is different, otherwise a '*' after the shorter option will 101 match with the longer one. 102 103 The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined 104 in gcc/config/{i386,rs6000}/darwin.h, should contain any additional 105 command-line option translations specific to the particular target 106 architecture. */ 107 108#define TARGET_OPTION_TRANSLATE_TABLE \ 109 { "-all_load", "-Zall_load" }, \ 110 { "-allowable_client", "-Zallowable_client" }, \ 111 { "-arch_errors_fatal", "-Zarch_errors_fatal" }, \ 112 { "-bind_at_load", "-Zbind_at_load" }, \ 113 { "-bundle", "-Zbundle" }, \ 114 { "-bundle_loader", "-Zbundle_loader" }, \ 115 { "-weak_reference_mismatches", "-Zweak_reference_mismatches" }, \ 116 { "-dead_strip", "-Zdead_strip" }, \ 117 { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \ 118 { "-dependency-file", "-MF" }, \ 119 { "-dylib_file", "-Zdylib_file" }, \ 120 { "-dynamic", "-Zdynamic" }, \ 121 { "-dynamiclib", "-Zdynamiclib" }, \ 122 { "-exported_symbols_list", "-Zexported_symbols_list" }, \ 123 { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \ 124 { "-gused", "-g -feliminate-unused-debug-symbols" }, \ 125 { "-segaddr", "-Zsegaddr" }, \ 126 { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \ 127 { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \ 128 { "-seg_addr_table", "-Zseg_addr_table" }, \ 129 { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \ 130 { "-fapple-kext", "-fapple-kext -static -Wa,-static" }, \ 131 { "-filelist", "-Xlinker -filelist -Xlinker" }, \ 132 { "-findirect-virtual-calls", "-fapple-kext" }, \ 133 { "-flat_namespace", "-Zflat_namespace" }, \ 134 { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" }, \ 135 { "-force_flat_namespace", "-Zforce_flat_namespace" }, \ 136 { "-framework", "-Xlinker -framework -Xlinker" }, \ 137 { "-fterminated-vtables", "-fapple-kext" }, \ 138 { "-image_base", "-Zimage_base" }, \ 139 { "-init", "-Zinit" }, \ 140 { "-install_name", "-Zinstall_name" }, \ 141 { "-mkernel", "-mkernel -static -Wa,-static" }, \ 142 { "-multiply_defined_unused", "-Zmultiplydefinedunused" }, \ 143 { "-multiply_defined", "-Zmultiply_defined" }, \ 144 { "-multi_module", "-Zmulti_module" }, \ 145 { "-static", "-static -Wa,-static" }, \ 146 { "-single_module", "-Zsingle_module" }, \ 147 { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \ 148 SUBTARGET_OPTION_TRANSLATE_TABLE 149 150#define SUBSUBTARGET_OVERRIDE_OPTIONS \ 151 do { \ 152 darwin_override_options (); \ 153 } while (0) 154 155/* These compiler options take n arguments. */ 156 157#undef WORD_SWITCH_TAKES_ARG 158#define WORD_SWITCH_TAKES_ARG(STR) \ 159 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 : \ 160 !strcmp (STR, "Zallowable_client") ? 1 : \ 161 !strcmp (STR, "arch") ? 1 : \ 162 !strcmp (STR, "arch_only") ? 1 : \ 163 !strcmp (STR, "Zbundle_loader") ? 1 : \ 164 !strcmp (STR, "client_name") ? 1 : \ 165 !strcmp (STR, "compatibility_version") ? 1 : \ 166 !strcmp (STR, "current_version") ? 1 : \ 167 !strcmp (STR, "Zdylib_file") ? 1 : \ 168 !strcmp (STR, "Zexported_symbols_list") ? 1 : \ 169 !strcmp (STR, "Zimage_base") ? 1 : \ 170 !strcmp (STR, "Zinit") ? 1 : \ 171 !strcmp (STR, "Zinstall_name") ? 1 : \ 172 !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \ 173 !strcmp (STR, "Zmultiply_defined") ? 1 : \ 174 !strcmp (STR, "precomp-trustfile") ? 1 : \ 175 !strcmp (STR, "read_only_relocs") ? 1 : \ 176 !strcmp (STR, "sectcreate") ? 3 : \ 177 !strcmp (STR, "sectorder") ? 3 : \ 178 !strcmp (STR, "Zsegaddr") ? 2 : \ 179 !strcmp (STR, "Zsegs_read_only_addr") ? 1 : \ 180 !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \ 181 !strcmp (STR, "Zseg_addr_table") ? 1 : \ 182 !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\ 183 !strcmp (STR, "seg1addr") ? 1 : \ 184 !strcmp (STR, "segprot") ? 3 : \ 185 !strcmp (STR, "sub_library") ? 1 : \ 186 !strcmp (STR, "sub_umbrella") ? 1 : \ 187 !strcmp (STR, "umbrella") ? 1 : \ 188 !strcmp (STR, "undefined") ? 1 : \ 189 !strcmp (STR, "Zunexported_symbols_list") ? 1 : \ 190 !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \ 191 !strcmp (STR, "pagezero_size") ? 1 : \ 192 !strcmp (STR, "segs_read_only_addr") ? 1 : \ 193 !strcmp (STR, "segs_read_write_addr") ? 1 : \ 194 !strcmp (STR, "sectalign") ? 3 : \ 195 !strcmp (STR, "sectobjectsymbols") ? 2 : \ 196 !strcmp (STR, "segcreate") ? 3 : \ 197 !strcmp (STR, "dylinker_install_name") ? 1 : \ 198 0) 199 200#define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do { \ 201 if (flag_mkernel || flag_apple_kext) \ 202 { \ 203 if (flag_use_cxa_atexit == 2) \ 204 flag_use_cxa_atexit = 0; \ 205 /* kexts should always be built without the coalesced sections \ 206 because the kernel loader doesn't grok such sections. */ \ 207 flag_weak = 0; \ 208 /* No RTTI in kexts. */ \ 209 flag_rtti = 0; \ 210 } \ 211 } while (0) 212 213/* Machine dependent cpp options. Don't add more options here, add 214 them to darwin_cpp_builtins in darwin-c.c. */ 215 216#undef CPP_SPEC 217#define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \ 218 " %{pthread:-D_REENTRANT}" 219 220/* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus 221 precomp, libtool, and fat build additions. Also we 222 don't specify a second %G after %L because libSystem is 223 self-contained and doesn't need to link against libgcc.a. */ 224/* In general, random Darwin linker flags should go into LINK_SPEC 225 instead of LINK_COMMAND_SPEC. The command spec is better for 226 specifying the handling of options understood by generic Unix 227 linkers, and for positional arguments like libraries. */ 228#define LINK_COMMAND_SPEC "\ 229%{!fdump=*:%{!fsyntax-only:%{!precomp:%{!c:%{!M:%{!MM:%{!E:%{!S:\ 230 %{!Zdynamiclib:%(linker)}%{Zdynamiclib:/usr/bin/libtool} \ 231 %l %X %{d} %{s} %{t} %{Z} \ 232 %{!Zdynamiclib:%{A} %{e*} %{m} %{N} %{n} %{r} %{u*} %{x} %{z}} \ 233 %{@:-o %f%u.out}%{!@:%{o*}%{!o:-o a.out}} \ 234 %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \ 235 %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)} \ 236 %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \ 237 %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \ 238 %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}}" 239 240#ifdef TARGET_SYSTEM_ROOT 241#define LINK_SYSROOT_SPEC \ 242 "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}" 243#else 244#define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}" 245#endif 246 247/* Please keep the random linker options in alphabetical order (modulo 248 'Z' and 'no' prefixes). Options that can only go to one of libtool 249 or ld must be listed twice, under both !Zdynamiclib and 250 Zdynamiclib, with one of the cases reporting an error. */ 251/* Note that options taking arguments may appear multiple times on a 252 command line with different arguments each time, so put a * after 253 their names so all of them get passed. */ 254#define LINK_SPEC \ 255 "%{static}%{!static:-dynamic} \ 256 %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\ 257 %{!Zdynamiclib: \ 258 %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \ 259 %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \ 260 %{Zbundle:-bundle} \ 261 %{Zbundle_loader*:-bundle_loader %*} \ 262 %{client_name*} \ 263 %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\ 264} \ 265 %{current_version*:%e-current_version only allowed with -dynamiclib} \ 266 %{Zforce_flat_namespace:-force_flat_namespace} \ 267 %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \ 268 %{keep_private_externs} \ 269 %{private_bundle} \ 270 } \ 271 %{Zdynamiclib: \ 272 %{Zbundle:%e-bundle not allowed with -dynamiclib} \ 273 %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \ 274 %{client_name*:%e-client_name not allowed with -dynamiclib} \ 275 %{compatibility_version*} \ 276 %{current_version*} \ 277 %{Zforce_cpusubtype_ALL:-arch_only %(darwin_arch)} \ 278 %{!Zforce_cpusubtype_ALL: -arch_only %(darwin_subarch)} \ 279 %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \ 280 %{Zinstall_name*:-install_name %*} \ 281 %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \ 282 %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \ 283 } \ 284 %{Zall_load:-all_load}%{Zdynamiclib:%{!Zall_load:-noall_load}} \ 285 %{Zallowable_client*:-allowable_client %*} \ 286 %{Zbind_at_load:-bind_at_load} \ 287 %{Zarch_errors_fatal:-arch_errors_fatal} \ 288 %{Zdead_strip:-dead_strip} \ 289 %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \ 290 %{Zdylib_file*:-dylib_file %*} \ 291 %{Zdynamic:-dynamic}\ 292 %{Zexported_symbols_list*:-exported_symbols_list %*} \ 293 %{Zflat_namespace:-flat_namespace} \ 294 %{headerpad_max_install_names*} \ 295 %{Zimage_base*:-image_base %*} \ 296 %{Zinit*:-init %*} \ 297 %{mmacosx-version-min=*:-macosx_version_min %*} \ 298 %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \ 299 %{nomultidefs} \ 300 %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \ 301 %{Zmultiply_defined*:-multiply_defined %*} \ 302 %{!Zmultiply_defined*:%{shared-libgcc: \ 303 %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \ 304 %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \ 305 %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \ 306 %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \ 307 %{read_only_relocs} \ 308 %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \ 309 %{Zsegaddr*:-segaddr %*} \ 310 %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \ 311 %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \ 312 %{Zseg_addr_table*: -seg_addr_table %*} \ 313 %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \ 314 %{sub_library*} %{sub_umbrella*} \ 315 " LINK_SYSROOT_SPEC " \ 316 %{twolevel_namespace} %{twolevel_namespace_hints} \ 317 %{umbrella*} \ 318 %{undefined*} \ 319 %{Zunexported_symbols_list*:-unexported_symbols_list %*} \ 320 %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \ 321 %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \ 322 %{X} \ 323 %{y*} \ 324 %{w} \ 325 %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit} \ 326 %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \ 327 %{whatsloaded} %{dylinker_install_name*} \ 328 %{dylinker} %{Mach} " 329 330 331/* Machine dependent libraries. */ 332 333#define LIB_SPEC "%{!static:-lSystem}" 334 335/* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib 336 libraries to link against, and by not linking against libgcc_s on 337 earlier-than-10.3.9. 338 339 Note that by default, -lgcc_eh is not linked against! This is 340 because in a future version of Darwin the EH frame information may 341 be in a new format, or the fallback routine might be changed; if 342 you want to explicitly link against the static version of those 343 routines, because you know you don't need to unwind through system 344 libraries, you need to explicitly say -static-libgcc. 345 346 If it is linked against, it has to be before -lgcc, because it may 347 need symbols from -lgcc. */ 348#undef REAL_LIBGCC_SPEC 349#define REAL_LIBGCC_SPEC \ 350 "%{static-libgcc|static: -lgcc_eh -lgcc; \ 351 shared-libgcc|fexceptions|fgnu-runtime: \ 352 %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4) \ 353 %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5) \ 354 -lgcc; \ 355 :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \ 356 %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5) \ 357 -lgcc}" 358 359/* We specify crt0.o as -lcrt0.o so that ld will search the library path. 360 361 crt3.o provides __cxa_atexit on systems that don't have it. Since 362 it's only used with C++, which requires passing -shared-libgcc, key 363 off that to avoid unnecessarily adding a destructor to every 364 powerpc program built. */ 365 366#undef STARTFILE_SPEC 367#define STARTFILE_SPEC \ 368 "%{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}} \ 369 %{!Zbundle:%{pg:%{static:-lgcrt0.o} \ 370 %{!static:%{object:-lgcrt0.o} \ 371 %{!object:%{preload:-lgcrt0.o} \ 372 %{!preload:-lgcrt1.o %(darwin_crt2)}}}} \ 373 %{!pg:%{static:-lcrt0.o} \ 374 %{!static:%{object:-lcrt0.o} \ 375 %{!object:%{preload:-lcrt0.o} \ 376 %{!preload:-lcrt1.o %(darwin_crt2)}}}}}} \ 377 %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}" 378 379/* The native Darwin linker doesn't necessarily place files in the order 380 that they're specified on the link line. Thus, it is pointless 381 to put anything in ENDFILE_SPEC. */ 382/* #define ENDFILE_SPEC "" */ 383 384/* Default Darwin ASM_SPEC, very simple. */ 385#define ASM_SPEC "-arch %(darwin_arch) \ 386 %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}" 387 388/* We use Dbx symbol format. */ 389 390#define DBX_DEBUGGING_INFO 1 391 392/* Also enable Dwarf 2 as an option. */ 393#define DWARF2_DEBUGGING_INFO 394#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG 395 396#define DEBUG_FRAME_SECTION "__DWARF,__debug_frame,regular,debug" 397#define DEBUG_INFO_SECTION "__DWARF,__debug_info,regular,debug" 398#define DEBUG_ABBREV_SECTION "__DWARF,__debug_abbrev,regular,debug" 399#define DEBUG_ARANGES_SECTION "__DWARF,__debug_aranges,regular,debug" 400#define DEBUG_MACINFO_SECTION "__DWARF,__debug_macinfo,regular,debug" 401#define DEBUG_LINE_SECTION "__DWARF,__debug_line,regular,debug" 402#define DEBUG_LOC_SECTION "__DWARF,__debug_loc,regular,debug" 403#define DEBUG_PUBNAMES_SECTION "__DWARF,__debug_pubnames,regular,debug" 404#define DEBUG_PUBTYPES_SECTION "__DWARF,__debug_pubtypes,regular,debug" 405#define DEBUG_STR_SECTION "__DWARF,__debug_str,regular,debug" 406#define DEBUG_RANGES_SECTION "__DWARF,__debug_ranges,regular,debug" 407 408/* When generating stabs debugging, use N_BINCL entries. */ 409 410#define DBX_USE_BINCL 411 412/* There is no limit to the length of stabs strings. */ 413 414#define DBX_CONTIN_LENGTH 0 415 416/* gdb needs a null N_SO at the end of each file for scattered loading. */ 417 418#define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END 419 420/* GCC's definition of 'one_only' is the same as its definition of 'weak'. */ 421#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) 422 423/* Mach-O supports 'weak imports', and 'weak definitions' in coalesced 424 sections. machopic_select_section ensures that weak variables go in 425 coalesced sections. Weak aliases (or any other kind of aliases) are 426 not supported. Weak symbols that aren't visible outside the .s file 427 are not supported. */ 428#define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS) \ 429 do { \ 430 if (ALIAS) \ 431 { \ 432 warning (0, "alias definitions not supported in Mach-O; ignored"); \ 433 break; \ 434 } \ 435 \ 436 if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL)) \ 437 targetm.asm_out.globalize_label (FILE, NAME); \ 438 if (DECL_EXTERNAL (DECL)) \ 439 fputs ("\t.weak_reference ", FILE); \ 440 else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL)) \ 441 && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL))) \ 442 break; \ 443 else if (TREE_PUBLIC (DECL)) \ 444 fputs ("\t.weak_definition ", FILE); \ 445 else \ 446 break; \ 447 assemble_name (FILE, NAME); \ 448 fputc ('\n', FILE); \ 449 } while (0) 450 451/* Darwin has the pthread routines in libSystem, which every program 452 links to, so there's no need for weak-ness for that. */ 453#define GTHREAD_USE_WEAK 0 454 455/* The Darwin linker imposes two limitations on common symbols: they 456 can't have hidden visibility, and they can't appear in dylibs. As 457 a consequence, we should never use common symbols to represent 458 vague linkage. */ 459#undef USE_COMMON_FOR_ONE_ONLY 460#define USE_COMMON_FOR_ONE_ONLY 0 461 462/* The Darwin linker doesn't want coalesced symbols to appear in 463 a static archive's table of contents. */ 464#undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC 465#define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1 466 467/* On Darwin, we don't (at the time of writing) have linkonce sections 468 with names, so it's safe to make the class data not comdat. */ 469#define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false 470 471/* For efficiency, on Darwin the RTTI information that is always 472 emitted in the standard C++ library should not be COMDAT. */ 473#define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false 474 475/* We make exception information linkonce. */ 476#undef TARGET_USES_WEAK_UNWIND_INFO 477#define TARGET_USES_WEAK_UNWIND_INFO 1 478 479/* We need to use a nonlocal label for the start of an EH frame: the 480 Darwin linker requires that a coalesced section start with a label. 481 Unfortunately, it also requires that 'debug' sections don't contain 482 labels. */ 483#undef FRAME_BEGIN_LABEL 484#define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe") 485 486/* Emit a label for the FDE corresponding to DECL. EMPTY means 487 emit a label for an empty FDE. */ 488#define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label 489 490/* Emit a label to separate the exception table. */ 491#define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label 492 493/* Our profiling scheme doesn't LP labels and counter words. */ 494 495#define NO_PROFILE_COUNTERS 1 496 497#undef INIT_SECTION_ASM_OP 498#define INIT_SECTION_ASM_OP 499 500#undef INVOKE__main 501 502#define TARGET_ASM_CONSTRUCTOR machopic_asm_out_constructor 503#define TARGET_ASM_DESTRUCTOR machopic_asm_out_destructor 504 505/* Always prefix with an underscore. */ 506 507#define USER_LABEL_PREFIX "_" 508 509/* Don't output a .file directive. That is only used by the assembler for 510 error reporting. */ 511#undef TARGET_ASM_FILE_START_FILE_DIRECTIVE 512#define TARGET_ASM_FILE_START_FILE_DIRECTIVE false 513 514#undef TARGET_ASM_FILE_END 515#define TARGET_ASM_FILE_END darwin_file_end 516 517#define ASM_OUTPUT_SKIP(FILE,SIZE) \ 518 fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE) 519 520/* Give ObjC methods pretty symbol names. */ 521 522#undef OBJC_GEN_METHOD_LABEL 523#define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \ 524 do { if (CAT_NAME) \ 525 sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+', \ 526 (CLASS_NAME), (CAT_NAME), (SEL_NAME)); \ 527 else \ 528 sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+', \ 529 (CLASS_NAME), (SEL_NAME)); \ 530 } while (0) 531 532/* The RTTI data (e.g., __ti4name) is common and public (and static), 533 but it does need to be referenced via indirect PIC data pointers. 534 The machopic_define_symbol calls are telling the machopic subsystem 535 that the name *is* defined in this module, so it doesn't need to 536 make them indirect. */ 537 538#undef ASM_DECLARE_OBJECT_NAME 539#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 540 do { \ 541 const char *xname = NAME; \ 542 if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \ 543 xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \ 544 if (! DECL_WEAK (DECL) \ 545 && ((TREE_STATIC (DECL) \ 546 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 547 || DECL_INITIAL (DECL))) \ 548 machopic_define_symbol (DECL_RTL (DECL)); \ 549 if ((TREE_STATIC (DECL) \ 550 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 551 || DECL_INITIAL (DECL)) \ 552 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \ 553 ASM_OUTPUT_LABEL (FILE, xname); \ 554 /* Darwin doesn't support zero-size objects, so give them a \ 555 byte. */ \ 556 if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0) \ 557 assemble_zeros (1); \ 558 } while (0) 559 560#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 561 do { \ 562 const char *xname = NAME; \ 563 if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \ 564 xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \ 565 if (! DECL_WEAK (DECL) \ 566 && ((TREE_STATIC (DECL) \ 567 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 568 || DECL_INITIAL (DECL))) \ 569 machopic_define_symbol (DECL_RTL (DECL)); \ 570 if ((TREE_STATIC (DECL) \ 571 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 572 || DECL_INITIAL (DECL)) \ 573 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \ 574 ASM_OUTPUT_LABEL (FILE, xname); \ 575 } while (0) 576 577#define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE) \ 578 do { \ 579 ASM_OUTPUT_LABEL (FILE, NAME); \ 580 /* Darwin doesn't support zero-size objects, so give them a \ 581 byte. */ \ 582 if ((SIZE) == 0) \ 583 assemble_zeros (1); \ 584 } while (0) 585 586/* Wrap new method names in quotes so the assembler doesn't gag. 587 Make Objective-C internal symbols local. */ 588 589#undef ASM_OUTPUT_LABELREF 590#define ASM_OUTPUT_LABELREF(FILE,NAME) \ 591 do { \ 592 const char *xname = (NAME); \ 593 if (! strcmp (xname, "<pic base>")) \ 594 machopic_output_function_base_name(FILE); \ 595 else if (xname[0] == '&' || xname[0] == '*') \ 596 { \ 597 int len = strlen (xname); \ 598 if (len > 6 && !strcmp ("$stub", xname + len - 5)) \ 599 machopic_validate_stub_or_non_lazy_ptr (xname); \ 600 else if (len > 7 && !strcmp ("$stub\"", xname + len - 6)) \ 601 machopic_validate_stub_or_non_lazy_ptr (xname); \ 602 else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \ 603 machopic_validate_stub_or_non_lazy_ptr (xname); \ 604 else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \ 605 machopic_validate_stub_or_non_lazy_ptr (xname); \ 606 if (xname[1] != '"' && name_needs_quotes (&xname[1])) \ 607 fprintf (FILE, "\"%s\"", &xname[1]); \ 608 else \ 609 fputs (&xname[1], FILE); \ 610 } \ 611 else if (xname[0] == '+' || xname[0] == '-') \ 612 fprintf (FILE, "\"%s\"", xname); \ 613 else if (!strncmp (xname, "_OBJC_", 6)) \ 614 fprintf (FILE, "L%s", xname); \ 615 else if (!strncmp (xname, ".objc_class_name_", 17)) \ 616 fprintf (FILE, "%s", xname); \ 617 else if (xname[0] != '"' && name_needs_quotes (xname)) \ 618 fprintf (FILE, "\"%s\"", xname); \ 619 else \ 620 asm_fprintf (FILE, "%U%s", xname); \ 621 } while (0) 622 623/* Output before executable code. */ 624#undef TEXT_SECTION_ASM_OP 625#define TEXT_SECTION_ASM_OP "\t.text" 626 627/* Output before writable data. */ 628 629#undef DATA_SECTION_ASM_OP 630#define DATA_SECTION_ASM_OP "\t.data" 631 632#undef ALIGN_ASM_OP 633#define ALIGN_ASM_OP ".align" 634 635#undef ASM_OUTPUT_ALIGN 636#define ASM_OUTPUT_ALIGN(FILE,LOG) \ 637 if ((LOG) != 0) \ 638 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)) 639 640/* Ensure correct alignment of bss data. */ 641 642#undef ASM_OUTPUT_ALIGNED_DECL_LOCAL 643#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \ 644 do { \ 645 unsigned HOST_WIDE_INT _new_size = SIZE; \ 646 fputs (".lcomm ", (FILE)); \ 647 assemble_name ((FILE), (NAME)); \ 648 if (_new_size == 0) _new_size = 1; \ 649 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \ 650 floor_log2 ((ALIGN) / BITS_PER_UNIT)); \ 651 if ((DECL) && ((TREE_STATIC (DECL) \ 652 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 653 || DECL_INITIAL (DECL))) \ 654 { \ 655 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \ 656 machopic_define_symbol (DECL_RTL (DECL)); \ 657 } \ 658 } while (0) 659 660/* The maximum alignment which the object file format can support in 661 bits. For Mach-O, this is 2^15 bytes. */ 662 663#undef MAX_OFILE_ALIGNMENT 664#define MAX_OFILE_ALIGNMENT (0x8000 * 8) 665 666/* Declare the section variables. */ 667#ifndef USED_FOR_TARGET 668enum darwin_section_enum { 669#define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME, 670#include "darwin-sections.def" 671#undef DEF_SECTION 672 NUM_DARWIN_SECTIONS 673}; 674extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS]; 675#endif 676 677#undef TARGET_ASM_SELECT_SECTION 678#define TARGET_ASM_SELECT_SECTION machopic_select_section 679#define USE_SELECT_SECTION_FOR_FUNCTIONS 680 681#undef TARGET_ASM_SELECT_RTX_SECTION 682#define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section 683#undef TARGET_ASM_UNIQUE_SECTION 684#define TARGET_ASM_UNIQUE_SECTION darwin_unique_section 685#undef TARGET_ASM_FUNCTION_RODATA_SECTION 686#define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section 687#undef TARGET_ASM_RELOC_RW_MASK 688#define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask 689 690 691#define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME) \ 692 do { \ 693 if (FILE) { \ 694 if (MACHOPIC_INDIRECT) \ 695 fprintf (FILE, "\t.lazy_reference "); \ 696 else \ 697 fprintf (FILE, "\t.reference "); \ 698 assemble_name (FILE, NAME); \ 699 fprintf (FILE, "\n"); \ 700 } \ 701 } while (0) 702 703#define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME) \ 704 do { \ 705 if (FILE) { \ 706 fprintf (FILE, "\t"); \ 707 assemble_name (FILE, NAME); \ 708 fprintf (FILE, "=0\n"); \ 709 (*targetm.asm_out.globalize_label) (FILE, NAME); \ 710 } \ 711 } while (0) 712 713/* Globalizing directive for a label. */ 714#define GLOBAL_ASM_OP ".globl " 715#define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label 716 717/* Emit an assembler directive to set visibility for a symbol. Used 718 to support visibility attribute and Darwin's private extern 719 feature. */ 720#undef TARGET_ASM_ASSEMBLE_VISIBILITY 721#define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility 722 723/* Extra attributes for Darwin. */ 724#define SUBTARGET_ATTRIBUTE_TABLE \ 725 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \ 726 { "apple_kext_compatibility", 0, 0, false, true, false, \ 727 darwin_handle_kext_attribute }, \ 728 { "weak_import", 0, 0, true, false, false, \ 729 darwin_handle_weak_import_attribute } 730 731#undef ASM_GENERATE_INTERNAL_LABEL 732#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \ 733 sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM)) 734 735#undef TARGET_ASM_MARK_DECL_PRESERVED 736#define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved 737 738/* Set on a symbol with SYMBOL_FLAG_FUNCTION or 739 MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or 740 variable has been defined in this translation unit. 741 When porting Mach-O to new architectures you need to make 742 sure these aren't clobbered by the backend. */ 743 744#define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP) 745#define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1) 746 747/* Set on a symbol to indicate when fix-and-continue style code 748 generation is being used and the symbol refers to a static symbol 749 that should be rebound from new instances of a translation unit to 750 the original instance of the data. */ 751 752#define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2) 753 754/* Symbolic names for various things we might know about a symbol. */ 755 756enum machopic_addr_class { 757 MACHOPIC_UNDEFINED, 758 MACHOPIC_DEFINED_DATA, 759 MACHOPIC_UNDEFINED_DATA, 760 MACHOPIC_DEFINED_FUNCTION, 761 MACHOPIC_UNDEFINED_FUNCTION 762}; 763 764/* Macros defining the various PIC cases. */ 765 766#define MACHO_DYNAMIC_NO_PIC_P (TARGET_DYNAMIC_NO_PIC) 767#define MACHOPIC_INDIRECT (flag_pic || MACHO_DYNAMIC_NO_PIC_P) 768#define MACHOPIC_JUST_INDIRECT (MACHO_DYNAMIC_NO_PIC_P) 769#define MACHOPIC_PURE (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P) 770 771#undef TARGET_ENCODE_SECTION_INFO 772#define TARGET_ENCODE_SECTION_INFO darwin_encode_section_info 773#undef TARGET_STRIP_NAME_ENCODING 774#define TARGET_STRIP_NAME_ENCODING default_strip_name_encoding 775 776#define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH) \ 777 do { \ 778 const char *const stub_ = (STUB); \ 779 char *buffer_ = (BUF); \ 780 strcpy (buffer_, stub_); \ 781 if (stub_[0] == '"') \ 782 { \ 783 strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\""); \ 784 } \ 785 else \ 786 { \ 787 strcpy (buffer_ + (STUB_LENGTH), "_binder"); \ 788 } \ 789 } while (0) 790 791#define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \ 792 do { \ 793 const char *const symbol_ = (SYMBOL); \ 794 char *buffer_ = (BUF); \ 795 if (name_needs_quotes (symbol_) && symbol_[0] != '"') \ 796 { \ 797 sprintf (buffer_, "\"%s\"", symbol_); \ 798 } \ 799 else \ 800 { \ 801 strcpy (buffer_, symbol_); \ 802 } \ 803 } while (0) 804 805/* Given a symbol name string, create the lazy pointer version 806 of the symbol name. */ 807 808#define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \ 809 do { \ 810 const char *symbol_ = (SYMBOL); \ 811 char *buffer_ = (BUF); \ 812 if (symbol_[0] == '"') \ 813 { \ 814 strcpy (buffer_, "\"L"); \ 815 strcpy (buffer_ + 2, symbol_ + 1); \ 816 strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\""); \ 817 } \ 818 else if (name_needs_quotes (symbol_)) \ 819 { \ 820 strcpy (buffer_, "\"L"); \ 821 strcpy (buffer_ + 2, symbol_); \ 822 strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\""); \ 823 } \ 824 else \ 825 { \ 826 strcpy (buffer_, "L"); \ 827 strcpy (buffer_ + 1, symbol_); \ 828 strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr"); \ 829 } \ 830 } while (0) 831 832#define EH_FRAME_SECTION_NAME "__TEXT" 833#define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support" 834 835/* Java runtime class list. */ 836#define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip" 837 838#undef ASM_PREFERRED_EH_DATA_FORMAT 839#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \ 840 (((CODE) == 2 && (GLOBAL) == 1) \ 841 ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \ 842 ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr) 843 844#define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2) \ 845 darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2) 846 847#define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE) \ 848 darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE) 849 850#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE) \ 851 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) { \ 852 darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR); \ 853 goto DONE; \ 854 } 855 856/* Experimentally, putting jump tables in text is faster on SPEC. 857 Also this is needed for correctness for coalesced functions. */ 858 859#ifndef JUMP_TABLES_IN_TEXT_SECTION 860#define JUMP_TABLES_IN_TEXT_SECTION 1 861#endif 862 863#define TARGET_TERMINATE_DW2_EH_FRAME_INFO false 864 865#define TARGET_ASM_INIT_SECTIONS darwin_init_sections 866#undef TARGET_ASM_NAMED_SECTION 867#define TARGET_ASM_NAMED_SECTION darwin_asm_named_section 868 869/* Handle pragma weak and pragma pack. */ 870#define HANDLE_SYSV_PRAGMA 1 871 872#define HANDLE_PRAGMA_PACK_PUSH_POP 1 873 874#define DARWIN_REGISTER_TARGET_PRAGMAS() \ 875 do { \ 876 /* APPLE LOCAL begin pragma mark 5614511 */ \ 877 /* Removed mark. */ \ 878 /* APPLE LOCAL end pragma mark 5614511 */ \ 879 c_register_pragma (0, "options", darwin_pragma_options); \ 880 c_register_pragma (0, "segment", darwin_pragma_ignore); \ 881 c_register_pragma (0, "unused", darwin_pragma_unused); \ 882 c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \ 883 } while (0) 884 885#undef ASM_APP_ON 886#define ASM_APP_ON "" 887#undef ASM_APP_OFF 888#define ASM_APP_OFF "" 889 890void darwin_register_frameworks (const char *, const char *, int); 891void darwin_register_objc_includes (const char *, const char *, int); 892#define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes 893#define TARGET_EXTRA_INCLUDES darwin_register_frameworks 894 895void add_framework_path (char *); 896#define TARGET_OPTF add_framework_path 897 898#define TARGET_POSIX_IO 899 900/* All new versions of Darwin have C99 functions. */ 901 902#define TARGET_C99_FUNCTIONS 1 903 904#define WINT_TYPE "int" 905 906/* Every program on darwin links against libSystem which contains the pthread 907 routines, so there's no need to explicitly call out when doing threaded 908 work. */ 909 910#undef GOMP_SELF_SPECS 911#define GOMP_SELF_SPECS "" 912 913/* Darwin can't support anchors until we can cope with the adjustments 914 to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME 915 when outputting members of an anchor block and the linker can be 916 taught to keep them together or we find some other suitable 917 code-gen technique. */ 918 919#if 0 920#define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor 921#else 922#define TARGET_ASM_OUTPUT_ANCHOR NULL 923#endif 924 925/* Attempt to turn on execute permission for the stack. This may be 926 used by INITIALIZE_TRAMPOLINE of the target needs it (that is, 927 if the target machine can change execute permissions on a page). 928 929 There is no way to query the execute permission of the stack, so 930 we always issue the mprotect() call. 931 932 Unfortunately it is not possible to make this namespace-clean. 933 934 Also note that no errors should be emitted by this code; it is 935 considered dangerous for library calls to send messages to 936 stdout/stderr. */ 937 938#define ENABLE_EXECUTE_STACK \ 939extern void __enable_execute_stack (void *); \ 940void \ 941__enable_execute_stack (void *addr) \ 942{ \ 943 extern int mprotect (void *, size_t, int); \ 944 extern int getpagesize (void); \ 945 static int size; \ 946 static long mask; \ 947 \ 948 char *page, *end; \ 949 \ 950 if (size == 0) \ 951 { \ 952 size = getpagesize(); \ 953 mask = ~((long) size - 1); \ 954 } \ 955 \ 956 page = (char *) (((long) addr) & mask); \ 957 end = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \ 958 \ 959 /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \ 960 (void) mprotect (page, end - page, 7); \ 961} 962 963/* For Apple KEXTs, we make the constructors return this to match gcc 964 2.95. */ 965#define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p) 966extern int flag_mkernel; 967extern int flag_apple_kext; 968#define TARGET_KEXTABI flag_apple_kext 969 970#endif /* CONFIG_DARWIN_H */ 971