1 /* Target definitions for Darwin (Mac OS X) systems.
2 Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
4 Free Software Foundation, Inc.
5 Contributed by Apple Computer Inc.
7 This file is part of GCC.
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)
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.
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. */
24 #ifndef CONFIG_DARWIN_H
25 #define CONFIG_DARWIN_H
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. */
34 /* Although NeXT ran on many different architectures, as of Jan 2001
35 the only supported Darwin targets are PowerPC and x86. */
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. */
41 #define OBJECT_FORMAT_MACHO
43 /* Suppress g++ attempt to link in the math library automatically. */
44 #define MATH_LIBRARY ""
50 /* Define an empty body for the function do_global_dtors() in libgcc2.c. */
52 #define DO_GLOBAL_DTORS_BODY
54 /* The string value for __SIZE_TYPE__. */
57 #define SIZE_TYPE "long unsigned int"
60 /* Type used for ptrdiff_t, as a string used in a declaration. */
63 #define PTRDIFF_TYPE "int"
68 #define WCHAR_TYPE "int"
69 #undef WCHAR_TYPE_SIZE
70 #define WCHAR_TYPE_SIZE 32
72 /* Default to using the NeXT-style runtime, since that's what is
73 pre-installed on Darwin systems. */
75 #define NEXT_OBJC_RUNTIME
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. */
80 #undef DEFAULT_PCC_STRUCT_RETURN
81 #define DEFAULT_PCC_STRUCT_RETURN 0
83 /* True if pragma ms_struct is in effect. */
84 extern GTY(()) int darwin_ms_struct;
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.
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.)
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.
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
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
150 #define SUBSUBTARGET_OVERRIDE_OPTIONS \
152 darwin_override_options (); \
155 /* These compiler options take n arguments. */
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 : \
200 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do { \
201 if (flag_mkernel || flag_apple_kext) \
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. */ \
208 /* No RTTI in kexts. */ \
213 /* Machine dependent cpp options. Don't add more options here, add
214 them to darwin_cpp_builtins in darwin-c.c. */
217 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}"
219 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
220 precomp, libtool, and fat build additions. Also we
221 don't specify a second %G after %L because libSystem is
222 self-contained and doesn't need to link against libgcc.a. */
223 /* In general, random Darwin linker flags should go into LINK_SPEC
224 instead of LINK_COMMAND_SPEC. The command spec is better for
225 specifying the handling of options understood by generic Unix
226 linkers, and for positional arguments like libraries. */
227 #define LINK_COMMAND_SPEC "\
228 %{!fdump=*:%{!fsyntax-only:%{!precomp:%{!c:%{!M:%{!MM:%{!E:%{!S:\
229 %{!Zdynamiclib:%(linker)}%{Zdynamiclib:/usr/bin/libtool} \
230 %l %X %{d} %{s} %{t} %{Z} \
231 %{!Zdynamiclib:%{A} %{e*} %{m} %{N} %{n} %{r} %{u*} %{x} %{z}} \
232 %{@:-o %f%u.out}%{!@:%{o*}%{!o:-o a.out}} \
233 %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
234 %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)} \
235 %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
236 %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
237 %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}}"
239 #ifdef TARGET_SYSTEM_ROOT
240 #define LINK_SYSROOT_SPEC \
241 "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
243 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
246 /* Please keep the random linker options in alphabetical order (modulo
247 'Z' and 'no' prefixes). Options that can only go to one of libtool
248 or ld must be listed twice, under both !Zdynamiclib and
249 Zdynamiclib, with one of the cases reporting an error. */
250 /* Note that options taking arguments may appear multiple times on a
251 command line with different arguments each time, so put a * after
252 their names so all of them get passed. */
254 "%{static}%{!static:-dynamic} \
255 %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
257 %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
258 %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
260 %{Zbundle_loader*:-bundle_loader %*} \
262 %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
264 %{current_version*:%e-current_version only allowed with -dynamiclib} \
265 %{Zforce_flat_namespace:-force_flat_namespace} \
266 %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
267 %{keep_private_externs} \
271 %{Zbundle:%e-bundle not allowed with -dynamiclib} \
272 %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
273 %{client_name*:%e-client_name not allowed with -dynamiclib} \
274 %{compatibility_version*} \
275 %{current_version*} \
276 %{Zforce_cpusubtype_ALL:-arch_only %(darwin_arch)} \
277 %{!Zforce_cpusubtype_ALL: -arch_only %(darwin_subarch)} \
278 %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
279 %{Zinstall_name*:-install_name %*} \
280 %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
281 %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
283 %{Zall_load:-all_load}%{Zdynamiclib:%{!Zall_load:-noall_load}} \
284 %{Zallowable_client*:-allowable_client %*} \
285 %{Zbind_at_load:-bind_at_load} \
286 %{Zarch_errors_fatal:-arch_errors_fatal} \
287 %{Zdead_strip:-dead_strip} \
288 %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
289 %{Zdylib_file*:-dylib_file %*} \
290 %{Zdynamic:-dynamic}\
291 %{Zexported_symbols_list*:-exported_symbols_list %*} \
292 %{Zflat_namespace:-flat_namespace} \
293 %{headerpad_max_install_names*} \
294 %{Zimage_base*:-image_base %*} \
296 %{mmacosx-version-min=*:-macosx_version_min %*} \
297 %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
299 %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
300 %{Zmultiply_defined*:-multiply_defined %*} \
301 %{!Zmultiply_defined*:%{shared-libgcc: \
302 %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
303 %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
304 %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
305 %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
306 %{read_only_relocs} \
307 %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
308 %{Zsegaddr*:-segaddr %*} \
309 %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
310 %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
311 %{Zseg_addr_table*: -seg_addr_table %*} \
312 %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
313 %{sub_library*} %{sub_umbrella*} \
314 " LINK_SYSROOT_SPEC " \
315 %{twolevel_namespace} %{twolevel_namespace_hints} \
318 %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
319 %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
320 %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
324 %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit} \
325 %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
326 %{whatsloaded} %{dylinker_install_name*} \
327 %{dylinker} %{Mach} "
330 /* Machine dependent libraries. */
332 #define LIB_SPEC "%{!static:-lSystem}"
334 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
335 libraries to link against, and by not linking against libgcc_s on
338 Note that by default, -lgcc_eh is not linked against! This is
339 because in a future version of Darwin the EH frame information may
340 be in a new format, or the fallback routine might be changed; if
341 you want to explicitly link against the static version of those
342 routines, because you know you don't need to unwind through system
343 libraries, you need to explicitly say -static-libgcc.
345 If it is linked against, it has to be before -lgcc, because it may
346 need symbols from -lgcc. */
347 #undef REAL_LIBGCC_SPEC
348 #define REAL_LIBGCC_SPEC \
349 "%{static-libgcc|static: -lgcc_eh -lgcc; \
350 shared-libgcc|fexceptions: \
351 %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4) \
352 %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5) \
354 :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
355 %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5) \
358 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
360 crt3.o provides __cxa_atexit on systems that don't have it. Since
361 it's only used with C++, which requires passing -shared-libgcc, key
362 off that to avoid unnecessarily adding a destructor to every
363 powerpc program built. */
365 #undef STARTFILE_SPEC
366 #define STARTFILE_SPEC \
367 "%{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}} \
368 %{!Zbundle:%{pg:%{static:-lgcrt0.o} \
369 %{!static:%{object:-lgcrt0.o} \
370 %{!object:%{preload:-lgcrt0.o} \
371 %{!preload:-lgcrt1.o %(darwin_crt2)}}}} \
372 %{!pg:%{static:-lcrt0.o} \
373 %{!static:%{object:-lcrt0.o} \
374 %{!object:%{preload:-lcrt0.o} \
375 %{!preload:-lcrt1.o %(darwin_crt2)}}}}}} \
376 %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
378 /* The native Darwin linker doesn't necessarily place files in the order
379 that they're specified on the link line. Thus, it is pointless
380 to put anything in ENDFILE_SPEC. */
381 /* #define ENDFILE_SPEC "" */
383 /* Default Darwin ASM_SPEC, very simple. */
384 #define ASM_SPEC "-arch %(darwin_arch) \
385 %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
387 /* We use Dbx symbol format. */
389 #define DBX_DEBUGGING_INFO 1
391 /* Also enable Dwarf 2 as an option. */
392 #define DWARF2_DEBUGGING_INFO
393 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
395 #define DEBUG_FRAME_SECTION "__DWARF,__debug_frame,regular,debug"
396 #define DEBUG_INFO_SECTION "__DWARF,__debug_info,regular,debug"
397 #define DEBUG_ABBREV_SECTION "__DWARF,__debug_abbrev,regular,debug"
398 #define DEBUG_ARANGES_SECTION "__DWARF,__debug_aranges,regular,debug"
399 #define DEBUG_MACINFO_SECTION "__DWARF,__debug_macinfo,regular,debug"
400 #define DEBUG_LINE_SECTION "__DWARF,__debug_line,regular,debug"
401 #define DEBUG_LOC_SECTION "__DWARF,__debug_loc,regular,debug"
402 #define DEBUG_PUBNAMES_SECTION "__DWARF,__debug_pubnames,regular,debug"
403 #define DEBUG_STR_SECTION "__DWARF,__debug_str,regular,debug"
404 #define DEBUG_RANGES_SECTION "__DWARF,__debug_ranges,regular,debug"
406 /* When generating stabs debugging, use N_BINCL entries. */
408 #define DBX_USE_BINCL
410 /* There is no limit to the length of stabs strings. */
412 #define DBX_CONTIN_LENGTH 0
414 /* gdb needs a null N_SO at the end of each file for scattered loading. */
416 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
418 /* GCC's definition of 'one_only' is the same as its definition of 'weak'. */
419 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
421 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
422 sections. machopic_select_section ensures that weak variables go in
423 coalesced sections. Weak aliases (or any other kind of aliases) are
424 not supported. Weak symbols that aren't visible outside the .s file
425 are not supported. */
426 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS) \
430 warning (0, "alias definitions not supported in Mach-O; ignored"); \
434 if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL)) \
435 targetm.asm_out.globalize_label (FILE, NAME); \
436 if (DECL_EXTERNAL (DECL)) \
437 fputs ("\t.weak_reference ", FILE); \
438 else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL)) \
439 && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL))) \
441 else if (TREE_PUBLIC (DECL)) \
442 fputs ("\t.weak_definition ", FILE); \
445 assemble_name (FILE, NAME); \
446 fputc ('\n', FILE); \
449 /* Darwin has the pthread routines in libSystem, which every program
450 links to, so there's no need for weak-ness for that. */
451 #define GTHREAD_USE_WEAK 0
453 /* The Darwin linker imposes two limitations on common symbols: they
454 can't have hidden visibility, and they can't appear in dylibs. As
455 a consequence, we should never use common symbols to represent
457 #undef USE_COMMON_FOR_ONE_ONLY
458 #define USE_COMMON_FOR_ONE_ONLY 0
460 /* The Darwin linker doesn't want coalesced symbols to appear in
461 a static archive's table of contents. */
462 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
463 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
465 /* On Darwin, we don't (at the time of writing) have linkonce sections
466 with names, so it's safe to make the class data not comdat. */
467 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
469 /* We make exception information linkonce. */
470 #undef TARGET_USES_WEAK_UNWIND_INFO
471 #define TARGET_USES_WEAK_UNWIND_INFO 1
473 /* We need to use a nonlocal label for the start of an EH frame: the
474 Darwin linker requires that a coalesced section start with a label.
475 Unfortunately, it also requires that 'debug' sections don't contain
477 #undef FRAME_BEGIN_LABEL
478 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
480 /* Emit a label for the FDE corresponding to DECL. EMPTY means
481 emit a label for an empty FDE. */
482 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
484 /* Emit a label to separate the exception table. */
485 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
487 /* Our profiling scheme doesn't LP labels and counter words. */
489 #define NO_PROFILE_COUNTERS 1
491 #undef INIT_SECTION_ASM_OP
492 #define INIT_SECTION_ASM_OP
496 #define TARGET_ASM_CONSTRUCTOR machopic_asm_out_constructor
497 #define TARGET_ASM_DESTRUCTOR machopic_asm_out_destructor
499 /* Always prefix with an underscore. */
501 #define USER_LABEL_PREFIX "_"
503 /* Don't output a .file directive. That is only used by the assembler for
505 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
506 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
508 #undef TARGET_ASM_FILE_END
509 #define TARGET_ASM_FILE_END darwin_file_end
511 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
512 fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
514 /* Give ObjC methods pretty symbol names. */
516 #undef OBJC_GEN_METHOD_LABEL
517 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
519 sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+', \
520 (CLASS_NAME), (CAT_NAME), (SEL_NAME)); \
522 sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+', \
523 (CLASS_NAME), (SEL_NAME)); \
526 /* The RTTI data (e.g., __ti4name) is common and public (and static),
527 but it does need to be referenced via indirect PIC data pointers.
528 The machopic_define_symbol calls are telling the machopic subsystem
529 that the name *is* defined in this module, so it doesn't need to
530 make them indirect. */
532 #undef ASM_DECLARE_OBJECT_NAME
533 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
535 const char *xname = NAME; \
536 if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \
537 xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \
538 if (! DECL_WEAK (DECL) \
539 && ((TREE_STATIC (DECL) \
540 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
541 || DECL_INITIAL (DECL))) \
542 machopic_define_symbol (DECL_RTL (DECL)); \
543 if ((TREE_STATIC (DECL) \
544 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
545 || DECL_INITIAL (DECL)) \
546 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
547 ASM_OUTPUT_LABEL (FILE, xname); \
548 /* Darwin doesn't support zero-size objects, so give them a \
550 if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0) \
551 assemble_zeros (1); \
554 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
556 const char *xname = NAME; \
557 if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \
558 xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \
559 if (! DECL_WEAK (DECL) \
560 && ((TREE_STATIC (DECL) \
561 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
562 || DECL_INITIAL (DECL))) \
563 machopic_define_symbol (DECL_RTL (DECL)); \
564 if ((TREE_STATIC (DECL) \
565 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
566 || DECL_INITIAL (DECL)) \
567 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
568 ASM_OUTPUT_LABEL (FILE, xname); \
571 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE) \
573 ASM_OUTPUT_LABEL (FILE, NAME); \
574 /* Darwin doesn't support zero-size objects, so give them a \
577 assemble_zeros (1); \
580 /* Wrap new method names in quotes so the assembler doesn't gag.
581 Make Objective-C internal symbols local. */
583 #undef ASM_OUTPUT_LABELREF
584 #define ASM_OUTPUT_LABELREF(FILE,NAME) \
586 const char *xname = (NAME); \
587 if (! strcmp (xname, "<pic base>")) \
588 machopic_output_function_base_name(FILE); \
589 else if (xname[0] == '&' || xname[0] == '*') \
591 int len = strlen (xname); \
592 if (len > 6 && !strcmp ("$stub", xname + len - 5)) \
593 machopic_validate_stub_or_non_lazy_ptr (xname); \
594 else if (len > 7 && !strcmp ("$stub\"", xname + len - 6)) \
595 machopic_validate_stub_or_non_lazy_ptr (xname); \
596 else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
597 machopic_validate_stub_or_non_lazy_ptr (xname); \
598 else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
599 machopic_validate_stub_or_non_lazy_ptr (xname); \
600 if (xname[1] != '"' && name_needs_quotes (&xname[1])) \
601 fprintf (FILE, "\"%s\"", &xname[1]); \
603 fputs (&xname[1], FILE); \
605 else if (xname[0] == '+' || xname[0] == '-') \
606 fprintf (FILE, "\"%s\"", xname); \
607 else if (!strncmp (xname, "_OBJC_", 6)) \
608 fprintf (FILE, "L%s", xname); \
609 else if (!strncmp (xname, ".objc_class_name_", 17)) \
610 fprintf (FILE, "%s", xname); \
611 else if (xname[0] != '"' && name_needs_quotes (xname)) \
612 fprintf (FILE, "\"%s\"", xname); \
614 asm_fprintf (FILE, "%U%s", xname); \
617 /* Output before executable code. */
618 #undef TEXT_SECTION_ASM_OP
619 #define TEXT_SECTION_ASM_OP "\t.text"
621 /* Output before writable data. */
623 #undef DATA_SECTION_ASM_OP
624 #define DATA_SECTION_ASM_OP "\t.data"
627 #define ALIGN_ASM_OP ".align"
629 #undef ASM_OUTPUT_ALIGN
630 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
632 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
634 /* Ensure correct alignment of bss data. */
636 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
637 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
639 unsigned HOST_WIDE_INT _new_size = SIZE; \
640 fputs (".lcomm ", (FILE)); \
641 assemble_name ((FILE), (NAME)); \
642 if (_new_size == 0) _new_size = 1; \
643 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
644 floor_log2 ((ALIGN) / BITS_PER_UNIT)); \
645 if ((DECL) && ((TREE_STATIC (DECL) \
646 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
647 || DECL_INITIAL (DECL))) \
649 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
650 machopic_define_symbol (DECL_RTL (DECL)); \
654 /* The maximum alignment which the object file format can support.
655 For Mach-O, this is 2^15. */
657 #undef MAX_OFILE_ALIGNMENT
658 #define MAX_OFILE_ALIGNMENT 0x8000
660 /* Declare the section variables. */
661 #ifndef USED_FOR_TARGET
662 enum darwin_section_enum {
663 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
664 #include "darwin-sections.def"
668 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
671 #undef TARGET_ASM_SELECT_SECTION
672 #define TARGET_ASM_SELECT_SECTION machopic_select_section
673 #define USE_SELECT_SECTION_FOR_FUNCTIONS
675 #undef TARGET_ASM_SELECT_RTX_SECTION
676 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
677 #undef TARGET_ASM_UNIQUE_SECTION
678 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
679 #undef TARGET_ASM_FUNCTION_RODATA_SECTION
680 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
683 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME) \
686 if (MACHOPIC_INDIRECT) \
687 fprintf (FILE, "\t.lazy_reference "); \
689 fprintf (FILE, "\t.reference "); \
690 assemble_name (FILE, NAME); \
691 fprintf (FILE, "\n"); \
695 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME) \
698 fprintf (FILE, "\t"); \
699 assemble_name (FILE, NAME); \
700 fprintf (FILE, "=0\n"); \
701 (*targetm.asm_out.globalize_label) (FILE, NAME); \
705 /* Globalizing directive for a label. */
706 #define GLOBAL_ASM_OP ".globl "
707 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
709 /* Emit an assembler directive to set visibility for a symbol. Used
710 to support visibility attribute and Darwin's private extern
712 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
713 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
715 /* Extra attributes for Darwin. */
716 #define SUBTARGET_ATTRIBUTE_TABLE \
717 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
718 { "apple_kext_compatibility", 0, 0, false, true, false, \
719 darwin_handle_kext_attribute }, \
720 { "weak_import", 0, 0, true, false, false, \
721 darwin_handle_weak_import_attribute }
723 #undef ASM_GENERATE_INTERNAL_LABEL
724 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
725 sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
727 #undef TARGET_ASM_MARK_DECL_PRESERVED
728 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
730 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
731 MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
732 variable has been defined in this translation unit.
733 When porting Mach-O to new architectures you need to make
734 sure these aren't clobbered by the backend. */
736 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
737 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
739 /* Set on a symbol to indicate when fix-and-continue style code
740 generation is being used and the symbol refers to a static symbol
741 that should be rebound from new instances of a translation unit to
742 the original instance of the data. */
744 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
746 /* Symbolic names for various things we might know about a symbol. */
748 enum machopic_addr_class {
750 MACHOPIC_DEFINED_DATA,
751 MACHOPIC_UNDEFINED_DATA,
752 MACHOPIC_DEFINED_FUNCTION,
753 MACHOPIC_UNDEFINED_FUNCTION
756 /* Macros defining the various PIC cases. */
758 #define MACHO_DYNAMIC_NO_PIC_P (TARGET_DYNAMIC_NO_PIC)
759 #define MACHOPIC_INDIRECT (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
760 #define MACHOPIC_JUST_INDIRECT (MACHO_DYNAMIC_NO_PIC_P)
761 #define MACHOPIC_PURE (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
763 #undef TARGET_ENCODE_SECTION_INFO
764 #define TARGET_ENCODE_SECTION_INFO darwin_encode_section_info
765 #undef TARGET_STRIP_NAME_ENCODING
766 #define TARGET_STRIP_NAME_ENCODING default_strip_name_encoding
768 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH) \
770 const char *const stub_ = (STUB); \
771 char *buffer_ = (BUF); \
772 strcpy (buffer_, stub_); \
773 if (stub_[0] == '"') \
775 strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\""); \
779 strcpy (buffer_ + (STUB_LENGTH), "_binder"); \
783 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \
785 const char *const symbol_ = (SYMBOL); \
786 char *buffer_ = (BUF); \
787 if (name_needs_quotes (symbol_) && symbol_[0] != '"') \
789 sprintf (buffer_, "\"%s\"", symbol_); \
793 strcpy (buffer_, symbol_); \
797 /* Given a symbol name string, create the lazy pointer version
798 of the symbol name. */
800 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \
802 const char *symbol_ = (SYMBOL); \
803 char *buffer_ = (BUF); \
804 if (symbol_[0] == '"') \
806 strcpy (buffer_, "\"L"); \
807 strcpy (buffer_ + 2, symbol_ + 1); \
808 strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\""); \
810 else if (name_needs_quotes (symbol_)) \
812 strcpy (buffer_, "\"L"); \
813 strcpy (buffer_ + 2, symbol_); \
814 strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\""); \
818 strcpy (buffer_, "L"); \
819 strcpy (buffer_ + 1, symbol_); \
820 strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr"); \
824 #define EH_FRAME_SECTION_NAME "__TEXT"
825 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
827 /* Java runtime class list. */
828 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
830 #undef ASM_PREFERRED_EH_DATA_FORMAT
831 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
832 (((CODE) == 2 && (GLOBAL) == 1) \
833 ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
834 ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
836 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2) \
837 darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
839 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE) \
840 darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
842 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE) \
843 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) { \
844 darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR); \
848 /* Experimentally, putting jump tables in text is faster on SPEC.
849 Also this is needed for correctness for coalesced functions. */
851 #ifndef JUMP_TABLES_IN_TEXT_SECTION
852 #define JUMP_TABLES_IN_TEXT_SECTION 1
855 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
857 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
858 #undef TARGET_ASM_NAMED_SECTION
859 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
861 /* Handle pragma weak and pragma pack. */
862 #define HANDLE_SYSV_PRAGMA 1
864 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
866 #define DARWIN_REGISTER_TARGET_PRAGMAS() \
868 c_register_pragma (0, "mark", darwin_pragma_ignore); \
869 c_register_pragma (0, "options", darwin_pragma_options); \
870 c_register_pragma (0, "segment", darwin_pragma_ignore); \
871 c_register_pragma (0, "unused", darwin_pragma_unused); \
872 c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
876 #define ASM_APP_ON ""
878 #define ASM_APP_OFF ""
880 void darwin_register_frameworks (const char *, const char *, int);
881 void darwin_register_objc_includes (const char *, const char *, int);
882 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
883 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
885 void add_framework_path (char *);
886 #define TARGET_OPTF add_framework_path
888 #define TARGET_POSIX_IO
890 /* All new versions of Darwin have C99 functions. */
892 #define TARGET_C99_FUNCTIONS 1
894 #define WINT_TYPE "int"
896 /* Every program on darwin links against libSystem which contains the pthread
897 routines, so there's no need to explicitly call out when doing threaded
900 #undef GOMP_SELF_SPECS
901 #define GOMP_SELF_SPECS ""
903 /* Darwin can't support anchors until we can cope with the adjustments
904 to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
905 when outputting members of an anchor block and the linker can be
906 taught to keep them together or we find some other suitable
907 code-gen technique. */
910 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
912 #define TARGET_ASM_OUTPUT_ANCHOR NULL
915 /* Attempt to turn on execute permission for the stack. This may be
916 used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
917 if the target machine can change execute permissions on a page).
919 There is no way to query the execute permission of the stack, so
920 we always issue the mprotect() call.
922 Unfortunately it is not possible to make this namespace-clean.
924 Also note that no errors should be emitted by this code; it is
925 considered dangerous for library calls to send messages to
928 #define ENABLE_EXECUTE_STACK \
929 extern void __enable_execute_stack (void *); \
931 __enable_execute_stack (void *addr) \
933 extern int mprotect (void *, size_t, int); \
934 extern int getpagesize (void); \
942 size = getpagesize(); \
943 mask = ~((long) size - 1); \
946 page = (char *) (((long) addr) & mask); \
947 end = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
949 /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \
950 (void) mprotect (page, end - page, 7); \
953 /* For Apple KEXTs, we make the constructors return this to match gcc
955 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
956 extern int flag_mkernel;
957 extern int flag_apple_kext;
958 #define TARGET_KEXTABI flag_apple_kext
960 #endif /* CONFIG_DARWIN_H */