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__}" \
218 " %{pthread:-D_REENTRANT}"
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*} }}}}}}}}"
240 #ifdef TARGET_SYSTEM_ROOT
241 #define LINK_SYSROOT_SPEC \
242 "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
244 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
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. */
255 "%{static}%{!static:-dynamic} \
256 %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
258 %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
259 %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
261 %{Zbundle_loader*:-bundle_loader %*} \
263 %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
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} \
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} \
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 %*} \
297 %{mmacosx-version-min=*:-macosx_version_min %*} \
298 %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
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} \
319 %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
320 %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
321 %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
325 %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit} \
326 %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
327 %{whatsloaded} %{dylinker_install_name*} \
328 %{dylinker} %{Mach} "
331 /* Machine dependent libraries. */
333 #define LIB_SPEC "%{!static:-lSystem}"
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
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.
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) \
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) \
359 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
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. */
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)}"
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 "" */
384 /* Default Darwin ASM_SPEC, very simple. */
385 #define ASM_SPEC "-arch %(darwin_arch) \
386 %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
388 /* We use Dbx symbol format. */
390 #define DBX_DEBUGGING_INFO 1
392 /* Also enable Dwarf 2 as an option. */
393 #define DWARF2_DEBUGGING_INFO
394 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
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"
407 /* When generating stabs debugging, use N_BINCL entries. */
409 #define DBX_USE_BINCL
411 /* There is no limit to the length of stabs strings. */
413 #define DBX_CONTIN_LENGTH 0
415 /* gdb needs a null N_SO at the end of each file for scattered loading. */
417 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
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)
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) \
431 warning (0, "alias definitions not supported in Mach-O; ignored"); \
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))) \
442 else if (TREE_PUBLIC (DECL)) \
443 fputs ("\t.weak_definition ", FILE); \
446 assemble_name (FILE, NAME); \
447 fputc ('\n', FILE); \
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
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
458 #undef USE_COMMON_FOR_ONE_ONLY
459 #define USE_COMMON_FOR_ONE_ONLY 0
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
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
470 /* We make exception information linkonce. */
471 #undef TARGET_USES_WEAK_UNWIND_INFO
472 #define TARGET_USES_WEAK_UNWIND_INFO 1
474 /* We need to use a nonlocal label for the start of an EH frame: the
475 Darwin linker requires that a coalesced section start with a label.
476 Unfortunately, it also requires that 'debug' sections don't contain
478 #undef FRAME_BEGIN_LABEL
479 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
481 /* Emit a label for the FDE corresponding to DECL. EMPTY means
482 emit a label for an empty FDE. */
483 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
485 /* Emit a label to separate the exception table. */
486 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
488 /* Our profiling scheme doesn't LP labels and counter words. */
490 #define NO_PROFILE_COUNTERS 1
492 #undef INIT_SECTION_ASM_OP
493 #define INIT_SECTION_ASM_OP
497 #define TARGET_ASM_CONSTRUCTOR machopic_asm_out_constructor
498 #define TARGET_ASM_DESTRUCTOR machopic_asm_out_destructor
500 /* Always prefix with an underscore. */
502 #define USER_LABEL_PREFIX "_"
504 /* Don't output a .file directive. That is only used by the assembler for
506 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
507 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
509 #undef TARGET_ASM_FILE_END
510 #define TARGET_ASM_FILE_END darwin_file_end
512 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
513 fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
515 /* Give ObjC methods pretty symbol names. */
517 #undef OBJC_GEN_METHOD_LABEL
518 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
520 sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+', \
521 (CLASS_NAME), (CAT_NAME), (SEL_NAME)); \
523 sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+', \
524 (CLASS_NAME), (SEL_NAME)); \
527 /* The RTTI data (e.g., __ti4name) is common and public (and static),
528 but it does need to be referenced via indirect PIC data pointers.
529 The machopic_define_symbol calls are telling the machopic subsystem
530 that the name *is* defined in this module, so it doesn't need to
531 make them indirect. */
533 #undef ASM_DECLARE_OBJECT_NAME
534 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
536 const char *xname = NAME; \
537 if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \
538 xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \
539 if (! DECL_WEAK (DECL) \
540 && ((TREE_STATIC (DECL) \
541 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
542 || DECL_INITIAL (DECL))) \
543 machopic_define_symbol (DECL_RTL (DECL)); \
544 if ((TREE_STATIC (DECL) \
545 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
546 || DECL_INITIAL (DECL)) \
547 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
548 ASM_OUTPUT_LABEL (FILE, xname); \
549 /* Darwin doesn't support zero-size objects, so give them a \
551 if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0) \
552 assemble_zeros (1); \
555 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
557 const char *xname = NAME; \
558 if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \
559 xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \
560 if (! DECL_WEAK (DECL) \
561 && ((TREE_STATIC (DECL) \
562 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
563 || DECL_INITIAL (DECL))) \
564 machopic_define_symbol (DECL_RTL (DECL)); \
565 if ((TREE_STATIC (DECL) \
566 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
567 || DECL_INITIAL (DECL)) \
568 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
569 ASM_OUTPUT_LABEL (FILE, xname); \
572 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE) \
574 ASM_OUTPUT_LABEL (FILE, NAME); \
575 /* Darwin doesn't support zero-size objects, so give them a \
578 assemble_zeros (1); \
581 /* Wrap new method names in quotes so the assembler doesn't gag.
582 Make Objective-C internal symbols local. */
584 #undef ASM_OUTPUT_LABELREF
585 #define ASM_OUTPUT_LABELREF(FILE,NAME) \
587 const char *xname = (NAME); \
588 if (! strcmp (xname, "<pic base>")) \
589 machopic_output_function_base_name(FILE); \
590 else if (xname[0] == '&' || xname[0] == '*') \
592 int len = strlen (xname); \
593 if (len > 6 && !strcmp ("$stub", xname + len - 5)) \
594 machopic_validate_stub_or_non_lazy_ptr (xname); \
595 else if (len > 7 && !strcmp ("$stub\"", xname + len - 6)) \
596 machopic_validate_stub_or_non_lazy_ptr (xname); \
597 else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
598 machopic_validate_stub_or_non_lazy_ptr (xname); \
599 else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
600 machopic_validate_stub_or_non_lazy_ptr (xname); \
601 if (xname[1] != '"' && name_needs_quotes (&xname[1])) \
602 fprintf (FILE, "\"%s\"", &xname[1]); \
604 fputs (&xname[1], FILE); \
606 else if (xname[0] == '+' || xname[0] == '-') \
607 fprintf (FILE, "\"%s\"", xname); \
608 else if (!strncmp (xname, "_OBJC_", 6)) \
609 fprintf (FILE, "L%s", xname); \
610 else if (!strncmp (xname, ".objc_class_name_", 17)) \
611 fprintf (FILE, "%s", xname); \
612 else if (xname[0] != '"' && name_needs_quotes (xname)) \
613 fprintf (FILE, "\"%s\"", xname); \
615 asm_fprintf (FILE, "%U%s", xname); \
618 /* Output before executable code. */
619 #undef TEXT_SECTION_ASM_OP
620 #define TEXT_SECTION_ASM_OP "\t.text"
622 /* Output before writable data. */
624 #undef DATA_SECTION_ASM_OP
625 #define DATA_SECTION_ASM_OP "\t.data"
628 #define ALIGN_ASM_OP ".align"
630 #undef ASM_OUTPUT_ALIGN
631 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
633 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
635 /* Ensure correct alignment of bss data. */
637 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
638 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
640 unsigned HOST_WIDE_INT _new_size = SIZE; \
641 fputs (".lcomm ", (FILE)); \
642 assemble_name ((FILE), (NAME)); \
643 if (_new_size == 0) _new_size = 1; \
644 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
645 floor_log2 ((ALIGN) / BITS_PER_UNIT)); \
646 if ((DECL) && ((TREE_STATIC (DECL) \
647 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
648 || DECL_INITIAL (DECL))) \
650 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
651 machopic_define_symbol (DECL_RTL (DECL)); \
655 /* The maximum alignment which the object file format can support in
656 bits. For Mach-O, this is 2^15 bytes. */
658 #undef MAX_OFILE_ALIGNMENT
659 #define MAX_OFILE_ALIGNMENT (0x8000 * 8)
661 /* Declare the section variables. */
662 #ifndef USED_FOR_TARGET
663 enum darwin_section_enum {
664 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
665 #include "darwin-sections.def"
669 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
672 #undef TARGET_ASM_SELECT_SECTION
673 #define TARGET_ASM_SELECT_SECTION machopic_select_section
674 #define USE_SELECT_SECTION_FOR_FUNCTIONS
676 #undef TARGET_ASM_SELECT_RTX_SECTION
677 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
678 #undef TARGET_ASM_UNIQUE_SECTION
679 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
680 #undef TARGET_ASM_FUNCTION_RODATA_SECTION
681 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
682 #undef TARGET_ASM_RELOC_RW_MASK
683 #define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask
686 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME) \
689 if (MACHOPIC_INDIRECT) \
690 fprintf (FILE, "\t.lazy_reference "); \
692 fprintf (FILE, "\t.reference "); \
693 assemble_name (FILE, NAME); \
694 fprintf (FILE, "\n"); \
698 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME) \
701 fprintf (FILE, "\t"); \
702 assemble_name (FILE, NAME); \
703 fprintf (FILE, "=0\n"); \
704 (*targetm.asm_out.globalize_label) (FILE, NAME); \
708 /* Globalizing directive for a label. */
709 #define GLOBAL_ASM_OP ".globl "
710 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
712 /* Emit an assembler directive to set visibility for a symbol. Used
713 to support visibility attribute and Darwin's private extern
715 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
716 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
718 /* Extra attributes for Darwin. */
719 #define SUBTARGET_ATTRIBUTE_TABLE \
720 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
721 { "apple_kext_compatibility", 0, 0, false, true, false, \
722 darwin_handle_kext_attribute }, \
723 { "weak_import", 0, 0, true, false, false, \
724 darwin_handle_weak_import_attribute }
726 #undef ASM_GENERATE_INTERNAL_LABEL
727 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
728 sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
730 #undef TARGET_ASM_MARK_DECL_PRESERVED
731 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
733 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
734 MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
735 variable has been defined in this translation unit.
736 When porting Mach-O to new architectures you need to make
737 sure these aren't clobbered by the backend. */
739 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
740 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
742 /* Set on a symbol to indicate when fix-and-continue style code
743 generation is being used and the symbol refers to a static symbol
744 that should be rebound from new instances of a translation unit to
745 the original instance of the data. */
747 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
749 /* Symbolic names for various things we might know about a symbol. */
751 enum machopic_addr_class {
753 MACHOPIC_DEFINED_DATA,
754 MACHOPIC_UNDEFINED_DATA,
755 MACHOPIC_DEFINED_FUNCTION,
756 MACHOPIC_UNDEFINED_FUNCTION
759 /* Macros defining the various PIC cases. */
761 #define MACHO_DYNAMIC_NO_PIC_P (TARGET_DYNAMIC_NO_PIC)
762 #define MACHOPIC_INDIRECT (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
763 #define MACHOPIC_JUST_INDIRECT (MACHO_DYNAMIC_NO_PIC_P)
764 #define MACHOPIC_PURE (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
766 #undef TARGET_ENCODE_SECTION_INFO
767 #define TARGET_ENCODE_SECTION_INFO darwin_encode_section_info
768 #undef TARGET_STRIP_NAME_ENCODING
769 #define TARGET_STRIP_NAME_ENCODING default_strip_name_encoding
771 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH) \
773 const char *const stub_ = (STUB); \
774 char *buffer_ = (BUF); \
775 strcpy (buffer_, stub_); \
776 if (stub_[0] == '"') \
778 strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\""); \
782 strcpy (buffer_ + (STUB_LENGTH), "_binder"); \
786 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \
788 const char *const symbol_ = (SYMBOL); \
789 char *buffer_ = (BUF); \
790 if (name_needs_quotes (symbol_) && symbol_[0] != '"') \
792 sprintf (buffer_, "\"%s\"", symbol_); \
796 strcpy (buffer_, symbol_); \
800 /* Given a symbol name string, create the lazy pointer version
801 of the symbol name. */
803 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \
805 const char *symbol_ = (SYMBOL); \
806 char *buffer_ = (BUF); \
807 if (symbol_[0] == '"') \
809 strcpy (buffer_, "\"L"); \
810 strcpy (buffer_ + 2, symbol_ + 1); \
811 strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\""); \
813 else if (name_needs_quotes (symbol_)) \
815 strcpy (buffer_, "\"L"); \
816 strcpy (buffer_ + 2, symbol_); \
817 strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\""); \
821 strcpy (buffer_, "L"); \
822 strcpy (buffer_ + 1, symbol_); \
823 strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr"); \
827 #define EH_FRAME_SECTION_NAME "__TEXT"
828 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
830 /* Java runtime class list. */
831 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
833 #undef ASM_PREFERRED_EH_DATA_FORMAT
834 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
835 (((CODE) == 2 && (GLOBAL) == 1) \
836 ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
837 ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
839 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2) \
840 darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
842 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE) \
843 darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
845 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE) \
846 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) { \
847 darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR); \
851 /* Experimentally, putting jump tables in text is faster on SPEC.
852 Also this is needed for correctness for coalesced functions. */
854 #ifndef JUMP_TABLES_IN_TEXT_SECTION
855 #define JUMP_TABLES_IN_TEXT_SECTION 1
858 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
860 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
861 #undef TARGET_ASM_NAMED_SECTION
862 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
864 /* Handle pragma weak and pragma pack. */
865 #define HANDLE_SYSV_PRAGMA 1
867 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
869 #define DARWIN_REGISTER_TARGET_PRAGMAS() \
871 c_register_pragma (0, "mark", darwin_pragma_ignore); \
872 c_register_pragma (0, "options", darwin_pragma_options); \
873 c_register_pragma (0, "segment", darwin_pragma_ignore); \
874 c_register_pragma (0, "unused", darwin_pragma_unused); \
875 c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
879 #define ASM_APP_ON ""
881 #define ASM_APP_OFF ""
883 void darwin_register_frameworks (const char *, const char *, int);
884 void darwin_register_objc_includes (const char *, const char *, int);
885 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
886 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
888 void add_framework_path (char *);
889 #define TARGET_OPTF add_framework_path
891 #define TARGET_POSIX_IO
893 /* All new versions of Darwin have C99 functions. */
895 #define TARGET_C99_FUNCTIONS 1
897 #define WINT_TYPE "int"
899 /* Every program on darwin links against libSystem which contains the pthread
900 routines, so there's no need to explicitly call out when doing threaded
903 #undef GOMP_SELF_SPECS
904 #define GOMP_SELF_SPECS ""
906 /* Darwin can't support anchors until we can cope with the adjustments
907 to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
908 when outputting members of an anchor block and the linker can be
909 taught to keep them together or we find some other suitable
910 code-gen technique. */
913 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
915 #define TARGET_ASM_OUTPUT_ANCHOR NULL
918 /* Attempt to turn on execute permission for the stack. This may be
919 used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
920 if the target machine can change execute permissions on a page).
922 There is no way to query the execute permission of the stack, so
923 we always issue the mprotect() call.
925 Unfortunately it is not possible to make this namespace-clean.
927 Also note that no errors should be emitted by this code; it is
928 considered dangerous for library calls to send messages to
931 #define ENABLE_EXECUTE_STACK \
932 extern void __enable_execute_stack (void *); \
934 __enable_execute_stack (void *addr) \
936 extern int mprotect (void *, size_t, int); \
937 extern int getpagesize (void); \
945 size = getpagesize(); \
946 mask = ~((long) size - 1); \
949 page = (char *) (((long) addr) & mask); \
950 end = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
952 /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \
953 (void) mprotect (page, end - page, 7); \
956 /* For Apple KEXTs, we make the constructors return this to match gcc
958 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
959 extern int flag_mkernel;
960 extern int flag_apple_kext;
961 #define TARGET_KEXTABI flag_apple_kext
963 #endif /* CONFIG_DARWIN_H */