darwin.h revision 259947
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_STR_SECTION "__DWARF,__debug_str,regular,debug" 405#define DEBUG_RANGES_SECTION "__DWARF,__debug_ranges,regular,debug" 406 407/* When generating stabs debugging, use N_BINCL entries. */ 408 409#define DBX_USE_BINCL 410 411/* There is no limit to the length of stabs strings. */ 412 413#define DBX_CONTIN_LENGTH 0 414 415/* gdb needs a null N_SO at the end of each file for scattered loading. */ 416 417#define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END 418 419/* GCC's definition of 'one_only' is the same as its definition of 'weak'. */ 420#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) 421 422/* Mach-O supports 'weak imports', and 'weak definitions' in coalesced 423 sections. machopic_select_section ensures that weak variables go in 424 coalesced sections. Weak aliases (or any other kind of aliases) are 425 not supported. Weak symbols that aren't visible outside the .s file 426 are not supported. */ 427#define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS) \ 428 do { \ 429 if (ALIAS) \ 430 { \ 431 warning (0, "alias definitions not supported in Mach-O; ignored"); \ 432 break; \ 433 } \ 434 \ 435 if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL)) \ 436 targetm.asm_out.globalize_label (FILE, NAME); \ 437 if (DECL_EXTERNAL (DECL)) \ 438 fputs ("\t.weak_reference ", FILE); \ 439 else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL)) \ 440 && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL))) \ 441 break; \ 442 else if (TREE_PUBLIC (DECL)) \ 443 fputs ("\t.weak_definition ", FILE); \ 444 else \ 445 break; \ 446 assemble_name (FILE, NAME); \ 447 fputc ('\n', FILE); \ 448 } while (0) 449 450/* Darwin has the pthread routines in libSystem, which every program 451 links to, so there's no need for weak-ness for that. */ 452#define GTHREAD_USE_WEAK 0 453 454/* The Darwin linker imposes two limitations on common symbols: they 455 can't have hidden visibility, and they can't appear in dylibs. As 456 a consequence, we should never use common symbols to represent 457 vague linkage. */ 458#undef USE_COMMON_FOR_ONE_ONLY 459#define USE_COMMON_FOR_ONE_ONLY 0 460 461/* The Darwin linker doesn't want coalesced symbols to appear in 462 a static archive's table of contents. */ 463#undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC 464#define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1 465 466/* On Darwin, we don't (at the time of writing) have linkonce sections 467 with names, so it's safe to make the class data not comdat. */ 468#define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false 469 470/* For efficiency, on Darwin the RTTI information that is always 471 emitted in the standard C++ library should not be COMDAT. */ 472#define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false 473 474/* We make exception information linkonce. */ 475#undef TARGET_USES_WEAK_UNWIND_INFO 476#define TARGET_USES_WEAK_UNWIND_INFO 1 477 478/* We need to use a nonlocal label for the start of an EH frame: the 479 Darwin linker requires that a coalesced section start with a label. 480 Unfortunately, it also requires that 'debug' sections don't contain 481 labels. */ 482#undef FRAME_BEGIN_LABEL 483#define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe") 484 485/* Emit a label for the FDE corresponding to DECL. EMPTY means 486 emit a label for an empty FDE. */ 487#define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label 488 489/* Emit a label to separate the exception table. */ 490#define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label 491 492/* Our profiling scheme doesn't LP labels and counter words. */ 493 494#define NO_PROFILE_COUNTERS 1 495 496#undef INIT_SECTION_ASM_OP 497#define INIT_SECTION_ASM_OP 498 499#undef INVOKE__main 500 501#define TARGET_ASM_CONSTRUCTOR machopic_asm_out_constructor 502#define TARGET_ASM_DESTRUCTOR machopic_asm_out_destructor 503 504/* Always prefix with an underscore. */ 505 506#define USER_LABEL_PREFIX "_" 507 508/* Don't output a .file directive. That is only used by the assembler for 509 error reporting. */ 510#undef TARGET_ASM_FILE_START_FILE_DIRECTIVE 511#define TARGET_ASM_FILE_START_FILE_DIRECTIVE false 512 513#undef TARGET_ASM_FILE_END 514#define TARGET_ASM_FILE_END darwin_file_end 515 516#define ASM_OUTPUT_SKIP(FILE,SIZE) \ 517 fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE) 518 519/* Give ObjC methods pretty symbol names. */ 520 521#undef OBJC_GEN_METHOD_LABEL 522#define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \ 523 do { if (CAT_NAME) \ 524 sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+', \ 525 (CLASS_NAME), (CAT_NAME), (SEL_NAME)); \ 526 else \ 527 sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+', \ 528 (CLASS_NAME), (SEL_NAME)); \ 529 } while (0) 530 531/* The RTTI data (e.g., __ti4name) is common and public (and static), 532 but it does need to be referenced via indirect PIC data pointers. 533 The machopic_define_symbol calls are telling the machopic subsystem 534 that the name *is* defined in this module, so it doesn't need to 535 make them indirect. */ 536 537#undef ASM_DECLARE_OBJECT_NAME 538#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 539 do { \ 540 const char *xname = NAME; \ 541 if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \ 542 xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \ 543 if (! DECL_WEAK (DECL) \ 544 && ((TREE_STATIC (DECL) \ 545 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 546 || DECL_INITIAL (DECL))) \ 547 machopic_define_symbol (DECL_RTL (DECL)); \ 548 if ((TREE_STATIC (DECL) \ 549 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 550 || DECL_INITIAL (DECL)) \ 551 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \ 552 ASM_OUTPUT_LABEL (FILE, xname); \ 553 /* Darwin doesn't support zero-size objects, so give them a \ 554 byte. */ \ 555 if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0) \ 556 assemble_zeros (1); \ 557 } while (0) 558 559#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 560 do { \ 561 const char *xname = NAME; \ 562 if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \ 563 xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \ 564 if (! DECL_WEAK (DECL) \ 565 && ((TREE_STATIC (DECL) \ 566 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 567 || DECL_INITIAL (DECL))) \ 568 machopic_define_symbol (DECL_RTL (DECL)); \ 569 if ((TREE_STATIC (DECL) \ 570 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 571 || DECL_INITIAL (DECL)) \ 572 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \ 573 ASM_OUTPUT_LABEL (FILE, xname); \ 574 } while (0) 575 576#define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE) \ 577 do { \ 578 ASM_OUTPUT_LABEL (FILE, NAME); \ 579 /* Darwin doesn't support zero-size objects, so give them a \ 580 byte. */ \ 581 if ((SIZE) == 0) \ 582 assemble_zeros (1); \ 583 } while (0) 584 585/* Wrap new method names in quotes so the assembler doesn't gag. 586 Make Objective-C internal symbols local. */ 587 588#undef ASM_OUTPUT_LABELREF 589#define ASM_OUTPUT_LABELREF(FILE,NAME) \ 590 do { \ 591 const char *xname = (NAME); \ 592 if (! strcmp (xname, "<pic base>")) \ 593 machopic_output_function_base_name(FILE); \ 594 else if (xname[0] == '&' || xname[0] == '*') \ 595 { \ 596 int len = strlen (xname); \ 597 if (len > 6 && !strcmp ("$stub", xname + len - 5)) \ 598 machopic_validate_stub_or_non_lazy_ptr (xname); \ 599 else if (len > 7 && !strcmp ("$stub\"", xname + len - 6)) \ 600 machopic_validate_stub_or_non_lazy_ptr (xname); \ 601 else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \ 602 machopic_validate_stub_or_non_lazy_ptr (xname); \ 603 else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \ 604 machopic_validate_stub_or_non_lazy_ptr (xname); \ 605 if (xname[1] != '"' && name_needs_quotes (&xname[1])) \ 606 fprintf (FILE, "\"%s\"", &xname[1]); \ 607 else \ 608 fputs (&xname[1], FILE); \ 609 } \ 610 else if (xname[0] == '+' || xname[0] == '-') \ 611 fprintf (FILE, "\"%s\"", xname); \ 612 else if (!strncmp (xname, "_OBJC_", 6)) \ 613 fprintf (FILE, "L%s", xname); \ 614 else if (!strncmp (xname, ".objc_class_name_", 17)) \ 615 fprintf (FILE, "%s", xname); \ 616 else if (xname[0] != '"' && name_needs_quotes (xname)) \ 617 fprintf (FILE, "\"%s\"", xname); \ 618 else \ 619 asm_fprintf (FILE, "%U%s", xname); \ 620 } while (0) 621 622/* Output before executable code. */ 623#undef TEXT_SECTION_ASM_OP 624#define TEXT_SECTION_ASM_OP "\t.text" 625 626/* Output before writable data. */ 627 628#undef DATA_SECTION_ASM_OP 629#define DATA_SECTION_ASM_OP "\t.data" 630 631#undef ALIGN_ASM_OP 632#define ALIGN_ASM_OP ".align" 633 634#undef ASM_OUTPUT_ALIGN 635#define ASM_OUTPUT_ALIGN(FILE,LOG) \ 636 if ((LOG) != 0) \ 637 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)) 638 639/* Ensure correct alignment of bss data. */ 640 641#undef ASM_OUTPUT_ALIGNED_DECL_LOCAL 642#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \ 643 do { \ 644 unsigned HOST_WIDE_INT _new_size = SIZE; \ 645 fputs (".lcomm ", (FILE)); \ 646 assemble_name ((FILE), (NAME)); \ 647 if (_new_size == 0) _new_size = 1; \ 648 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \ 649 floor_log2 ((ALIGN) / BITS_PER_UNIT)); \ 650 if ((DECL) && ((TREE_STATIC (DECL) \ 651 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \ 652 || DECL_INITIAL (DECL))) \ 653 { \ 654 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \ 655 machopic_define_symbol (DECL_RTL (DECL)); \ 656 } \ 657 } while (0) 658 659/* The maximum alignment which the object file format can support in 660 bits. For Mach-O, this is 2^15 bytes. */ 661 662#undef MAX_OFILE_ALIGNMENT 663#define MAX_OFILE_ALIGNMENT (0x8000 * 8) 664 665/* Declare the section variables. */ 666#ifndef USED_FOR_TARGET 667enum darwin_section_enum { 668#define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME, 669#include "darwin-sections.def" 670#undef DEF_SECTION 671 NUM_DARWIN_SECTIONS 672}; 673extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS]; 674#endif 675 676#undef TARGET_ASM_SELECT_SECTION 677#define TARGET_ASM_SELECT_SECTION machopic_select_section 678#define USE_SELECT_SECTION_FOR_FUNCTIONS 679 680#undef TARGET_ASM_SELECT_RTX_SECTION 681#define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section 682#undef TARGET_ASM_UNIQUE_SECTION 683#define TARGET_ASM_UNIQUE_SECTION darwin_unique_section 684#undef TARGET_ASM_FUNCTION_RODATA_SECTION 685#define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section 686#undef TARGET_ASM_RELOC_RW_MASK 687#define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask 688 689 690#define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME) \ 691 do { \ 692 if (FILE) { \ 693 if (MACHOPIC_INDIRECT) \ 694 fprintf (FILE, "\t.lazy_reference "); \ 695 else \ 696 fprintf (FILE, "\t.reference "); \ 697 assemble_name (FILE, NAME); \ 698 fprintf (FILE, "\n"); \ 699 } \ 700 } while (0) 701 702#define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME) \ 703 do { \ 704 if (FILE) { \ 705 fprintf (FILE, "\t"); \ 706 assemble_name (FILE, NAME); \ 707 fprintf (FILE, "=0\n"); \ 708 (*targetm.asm_out.globalize_label) (FILE, NAME); \ 709 } \ 710 } while (0) 711 712/* Globalizing directive for a label. */ 713#define GLOBAL_ASM_OP ".globl " 714#define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label 715 716/* Emit an assembler directive to set visibility for a symbol. Used 717 to support visibility attribute and Darwin's private extern 718 feature. */ 719#undef TARGET_ASM_ASSEMBLE_VISIBILITY 720#define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility 721 722/* Extra attributes for Darwin. */ 723#define SUBTARGET_ATTRIBUTE_TABLE \ 724 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \ 725 { "apple_kext_compatibility", 0, 0, false, true, false, \ 726 darwin_handle_kext_attribute }, \ 727 { "weak_import", 0, 0, true, false, false, \ 728 darwin_handle_weak_import_attribute } 729 730#undef ASM_GENERATE_INTERNAL_LABEL 731#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \ 732 sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM)) 733 734#undef TARGET_ASM_MARK_DECL_PRESERVED 735#define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved 736 737/* Set on a symbol with SYMBOL_FLAG_FUNCTION or 738 MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or 739 variable has been defined in this translation unit. 740 When porting Mach-O to new architectures you need to make 741 sure these aren't clobbered by the backend. */ 742 743#define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP) 744#define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1) 745 746/* Set on a symbol to indicate when fix-and-continue style code 747 generation is being used and the symbol refers to a static symbol 748 that should be rebound from new instances of a translation unit to 749 the original instance of the data. */ 750 751#define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2) 752 753/* Symbolic names for various things we might know about a symbol. */ 754 755enum machopic_addr_class { 756 MACHOPIC_UNDEFINED, 757 MACHOPIC_DEFINED_DATA, 758 MACHOPIC_UNDEFINED_DATA, 759 MACHOPIC_DEFINED_FUNCTION, 760 MACHOPIC_UNDEFINED_FUNCTION 761}; 762 763/* Macros defining the various PIC cases. */ 764 765#define MACHO_DYNAMIC_NO_PIC_P (TARGET_DYNAMIC_NO_PIC) 766#define MACHOPIC_INDIRECT (flag_pic || MACHO_DYNAMIC_NO_PIC_P) 767#define MACHOPIC_JUST_INDIRECT (MACHO_DYNAMIC_NO_PIC_P) 768#define MACHOPIC_PURE (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P) 769 770#undef TARGET_ENCODE_SECTION_INFO 771#define TARGET_ENCODE_SECTION_INFO darwin_encode_section_info 772#undef TARGET_STRIP_NAME_ENCODING 773#define TARGET_STRIP_NAME_ENCODING default_strip_name_encoding 774 775#define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH) \ 776 do { \ 777 const char *const stub_ = (STUB); \ 778 char *buffer_ = (BUF); \ 779 strcpy (buffer_, stub_); \ 780 if (stub_[0] == '"') \ 781 { \ 782 strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\""); \ 783 } \ 784 else \ 785 { \ 786 strcpy (buffer_ + (STUB_LENGTH), "_binder"); \ 787 } \ 788 } while (0) 789 790#define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \ 791 do { \ 792 const char *const symbol_ = (SYMBOL); \ 793 char *buffer_ = (BUF); \ 794 if (name_needs_quotes (symbol_) && symbol_[0] != '"') \ 795 { \ 796 sprintf (buffer_, "\"%s\"", symbol_); \ 797 } \ 798 else \ 799 { \ 800 strcpy (buffer_, symbol_); \ 801 } \ 802 } while (0) 803 804/* Given a symbol name string, create the lazy pointer version 805 of the symbol name. */ 806 807#define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \ 808 do { \ 809 const char *symbol_ = (SYMBOL); \ 810 char *buffer_ = (BUF); \ 811 if (symbol_[0] == '"') \ 812 { \ 813 strcpy (buffer_, "\"L"); \ 814 strcpy (buffer_ + 2, symbol_ + 1); \ 815 strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\""); \ 816 } \ 817 else if (name_needs_quotes (symbol_)) \ 818 { \ 819 strcpy (buffer_, "\"L"); \ 820 strcpy (buffer_ + 2, symbol_); \ 821 strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\""); \ 822 } \ 823 else \ 824 { \ 825 strcpy (buffer_, "L"); \ 826 strcpy (buffer_ + 1, symbol_); \ 827 strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr"); \ 828 } \ 829 } while (0) 830 831#define EH_FRAME_SECTION_NAME "__TEXT" 832#define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support" 833 834/* Java runtime class list. */ 835#define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip" 836 837#undef ASM_PREFERRED_EH_DATA_FORMAT 838#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \ 839 (((CODE) == 2 && (GLOBAL) == 1) \ 840 ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \ 841 ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr) 842 843#define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2) \ 844 darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2) 845 846#define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE) \ 847 darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE) 848 849#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE) \ 850 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) { \ 851 darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR); \ 852 goto DONE; \ 853 } 854 855/* Experimentally, putting jump tables in text is faster on SPEC. 856 Also this is needed for correctness for coalesced functions. */ 857 858#ifndef JUMP_TABLES_IN_TEXT_SECTION 859#define JUMP_TABLES_IN_TEXT_SECTION 1 860#endif 861 862#define TARGET_TERMINATE_DW2_EH_FRAME_INFO false 863 864#define TARGET_ASM_INIT_SECTIONS darwin_init_sections 865#undef TARGET_ASM_NAMED_SECTION 866#define TARGET_ASM_NAMED_SECTION darwin_asm_named_section 867 868/* Handle pragma weak and pragma pack. */ 869#define HANDLE_SYSV_PRAGMA 1 870 871#define HANDLE_PRAGMA_PACK_PUSH_POP 1 872 873#define DARWIN_REGISTER_TARGET_PRAGMAS() \ 874 do { \ 875 c_register_pragma (0, "mark", darwin_pragma_ignore); \ 876 c_register_pragma (0, "options", darwin_pragma_options); \ 877 c_register_pragma (0, "segment", darwin_pragma_ignore); \ 878 c_register_pragma (0, "unused", darwin_pragma_unused); \ 879 c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \ 880 } while (0) 881 882#undef ASM_APP_ON 883#define ASM_APP_ON "" 884#undef ASM_APP_OFF 885#define ASM_APP_OFF "" 886 887void darwin_register_frameworks (const char *, const char *, int); 888void darwin_register_objc_includes (const char *, const char *, int); 889#define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes 890#define TARGET_EXTRA_INCLUDES darwin_register_frameworks 891 892void add_framework_path (char *); 893#define TARGET_OPTF add_framework_path 894 895#define TARGET_POSIX_IO 896 897/* All new versions of Darwin have C99 functions. */ 898 899#define TARGET_C99_FUNCTIONS 1 900 901#define WINT_TYPE "int" 902 903/* Every program on darwin links against libSystem which contains the pthread 904 routines, so there's no need to explicitly call out when doing threaded 905 work. */ 906 907#undef GOMP_SELF_SPECS 908#define GOMP_SELF_SPECS "" 909 910/* Darwin can't support anchors until we can cope with the adjustments 911 to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME 912 when outputting members of an anchor block and the linker can be 913 taught to keep them together or we find some other suitable 914 code-gen technique. */ 915 916#if 0 917#define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor 918#else 919#define TARGET_ASM_OUTPUT_ANCHOR NULL 920#endif 921 922/* Attempt to turn on execute permission for the stack. This may be 923 used by INITIALIZE_TRAMPOLINE of the target needs it (that is, 924 if the target machine can change execute permissions on a page). 925 926 There is no way to query the execute permission of the stack, so 927 we always issue the mprotect() call. 928 929 Unfortunately it is not possible to make this namespace-clean. 930 931 Also note that no errors should be emitted by this code; it is 932 considered dangerous for library calls to send messages to 933 stdout/stderr. */ 934 935#define ENABLE_EXECUTE_STACK \ 936extern void __enable_execute_stack (void *); \ 937void \ 938__enable_execute_stack (void *addr) \ 939{ \ 940 extern int mprotect (void *, size_t, int); \ 941 extern int getpagesize (void); \ 942 static int size; \ 943 static long mask; \ 944 \ 945 char *page, *end; \ 946 \ 947 if (size == 0) \ 948 { \ 949 size = getpagesize(); \ 950 mask = ~((long) size - 1); \ 951 } \ 952 \ 953 page = (char *) (((long) addr) & mask); \ 954 end = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \ 955 \ 956 /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \ 957 (void) mprotect (page, end - page, 7); \ 958} 959 960/* For Apple KEXTs, we make the constructors return this to match gcc 961 2.95. */ 962#define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p) 963extern int flag_mkernel; 964extern int flag_apple_kext; 965#define TARGET_KEXTABI flag_apple_kext 966 967#endif /* CONFIG_DARWIN_H */ 968