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1 /* Target definitions for Darwin (Mac OS X) systems.
2 Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Contributed by Apple Computer Inc.
6
7 This file is part of GCC.
8
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
12 any later version.
13
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 Under Section 7 of GPL version 3, you are granted additional
20 permissions described in the GCC Runtime Library Exception, version
21 3.1, as published by the Free Software Foundation.
22
23 You should have received a copy of the GNU General Public License and
24 a copy of the GCC Runtime Library Exception along with this program;
25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
26 <http://www.gnu.org/licenses/>. */
27
28 #ifndef CONFIG_DARWIN_H
29 #define CONFIG_DARWIN_H
30
31 /* The definitions in this file are common to all processor types
32 running Darwin, which is the kernel for Mac OS X. Darwin is
33 basically a BSD user layer laid over a Mach kernel, then evolved
34 for many years (at NeXT) in parallel with other Unix systems. So
35 while the runtime is a somewhat idiosyncratic Mach-based thing,
36 other definitions look like they would for a BSD variant. */
37
38 /* Although NeXT ran on many different architectures, as of Jan 2001
39 the only supported Darwin targets are PowerPC and x86. */
40
41 /* One of Darwin's NeXT legacies is the Mach-O format, which is partly
42 like a.out and partly like COFF, with additional features like
43 multi-architecture binary support. */
44
45 #define DARWIN_X86 0
46 #define DARWIN_PPC 0
47
48 /* Don't assume anything about the header files. */
49 #define NO_IMPLICIT_EXTERN_C
50
51 /* Suppress g++ attempt to link in the math library automatically. */
52 #define MATH_LIBRARY ""
53
54 /* We have atexit. */
55
56 #define HAVE_ATEXIT
57
58 /* Define an empty body for the function do_global_dtors() in libgcc2.c. */
59
60 #define DO_GLOBAL_DTORS_BODY
61
62 /* The string value for __SIZE_TYPE__. */
63
64 #ifndef SIZE_TYPE
65 #define SIZE_TYPE "long unsigned int"
66 #endif
67
68 /* Type used for ptrdiff_t, as a string used in a declaration. */
69
70 #undef PTRDIFF_TYPE
71 #define PTRDIFF_TYPE "int"
72
73 /* wchar_t is int. */
74
75 #undef WCHAR_TYPE
76 #define WCHAR_TYPE "int"
77 #undef WCHAR_TYPE_SIZE
78 #define WCHAR_TYPE_SIZE 32
79
80 #define INT8_TYPE "signed char"
81 #define INT16_TYPE "short int"
82 #define INT32_TYPE "int"
83 #define INT64_TYPE "long long int"
84 #define UINT8_TYPE "unsigned char"
85 #define UINT16_TYPE "short unsigned int"
86 #define UINT32_TYPE "unsigned int"
87 #define UINT64_TYPE "long long unsigned int"
88
89 #define INT_LEAST8_TYPE "signed char"
90 #define INT_LEAST16_TYPE "short int"
91 #define INT_LEAST32_TYPE "int"
92 #define INT_LEAST64_TYPE "long long int"
93 #define UINT_LEAST8_TYPE "unsigned char"
94 #define UINT_LEAST16_TYPE "short unsigned int"
95 #define UINT_LEAST32_TYPE "unsigned int"
96 #define UINT_LEAST64_TYPE "long long unsigned int"
97
98 #define INT_FAST8_TYPE "signed char"
99 #define INT_FAST16_TYPE "short int"
100 #define INT_FAST32_TYPE "int"
101 #define INT_FAST64_TYPE "long long int"
102 #define UINT_FAST8_TYPE "unsigned char"
103 #define UINT_FAST16_TYPE "short unsigned int"
104 #define UINT_FAST32_TYPE "unsigned int"
105 #define UINT_FAST64_TYPE "long long unsigned int"
106
107 #define INTPTR_TYPE "long int"
108 #define UINTPTR_TYPE "long unsigned int"
109
110 #define SIG_ATOMIC_TYPE "int"
111
112 /* Default to using the NeXT-style runtime, since that's what is
113 pre-installed on Darwin systems. */
114
115 #define NEXT_OBJC_RUNTIME
116
117 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
118 we want to retain compatibility with older gcc versions. */
119
120 #undef DEFAULT_PCC_STRUCT_RETURN
121 #define DEFAULT_PCC_STRUCT_RETURN 0
122
123 /* True if pragma ms_struct is in effect. */
124 extern GTY(()) int darwin_ms_struct;
125
126 #define DRIVER_SELF_SPECS \
127 "%{gfull:-g -fno-eliminate-unused-debug-symbols} %<gfull", \
128 "%{gused:-g -feliminate-unused-debug-symbols} %<gused", \
129 "%{fapple-kext|mkernel:-static}", \
130 "%{shared:-Zdynamiclib} %<shared"
131
132 #define DARWIN_CC1_SPEC \
133 "%{findirect-virtual-calls: -fapple-kext} %<findirect-virtual-calls " \
134 "%{fterminated-vtables: -fapple-kext} %<fterminated-vtables " \
135 "%<filelist* %<framework*"
136
137 #define SUBSUBTARGET_OVERRIDE_OPTIONS \
138 do { \
139 darwin_override_options (); \
140 } while (0)
141
142 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do { \
143 if (flag_mkernel || flag_apple_kext) \
144 { \
145 if (flag_use_cxa_atexit == 2) \
146 flag_use_cxa_atexit = 0; \
147 /* kexts should always be built without the coalesced sections \
148 because the kernel loader doesn't grok such sections. */ \
149 flag_weak = 0; \
150 /* No RTTI in kexts. */ \
151 flag_rtti = 0; \
152 } \
153 } while (0)
154
155 /* Machine dependent cpp options. Don't add more options here, add
156 them to darwin_cpp_builtins in darwin-c.c. */
157
158 #undef CPP_SPEC
159 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
160 " %{pthread:-D_REENTRANT}"
161
162 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
163 precomp, libtool, and fat build additions. Also we
164 don't specify a second %G after %L because libSystem is
165 self-contained and doesn't need to link against libgcc.a. */
166 /* In general, random Darwin linker flags should go into LINK_SPEC
167 instead of LINK_COMMAND_SPEC. The command spec is better for
168 specifying the handling of options understood by generic Unix
169 linkers, and for positional arguments like libraries. */
170
171 #define LINK_COMMAND_SPEC_A \
172 "%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
173 %(linker) \
174 %{flto*:%<fcompare-debug*} \
175 %{flto*} \
176 %l %X %{d} %{s} %{t} %{Z} %{u*} \
177 %{A} %{e*} %{m} %{r} \
178 %{o*}%{!o:-o a.out} \
179 %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
180 %{L*} %(link_libgcc) %o %{fprofile-arcs|fprofile-generate*|coverage:-lgcov} \
181 %{fopenmp|ftree-parallelize-loops=*: \
182 %{static|static-libgcc|static-libstdc++|static-libgfortran: libgomp.a%s; : -lgomp } } \
183 %{!nostdlib:%{!nodefaultlibs: %(link_ssp) %G %L }} \
184 %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n"
185
186 #define DSYMUTIL "dsymutil"
187
188 #define DSYMUTIL_SPEC \
189 "%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
190 %{.c|.cc|.C|.cpp|.cp|.c++|.cxx|.CPP|.m|.mm: \
191 %{gdwarf-2:%{!gstabs*:%{!g0: " DSYMUTIL " %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
192
193 #define LINK_COMMAND_SPEC LINK_COMMAND_SPEC_A DSYMUTIL_SPEC
194
195 #ifdef TARGET_SYSTEM_ROOT
196 #define LINK_SYSROOT_SPEC \
197 "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
198 #else
199 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
200 #endif
201
202 /* Please keep the random linker options in alphabetical order (modulo
203 'Z' and 'no' prefixes). Note that options taking arguments may appear
204 multiple times on a command line with different arguments each time,
205 so put a * after their names so all of them get passed. */
206 #define LINK_SPEC \
207 "%{static}%{!static:-dynamic} \
208 %:remove-outfile(-ldl) \
209 %:remove-outfile(-lm) \
210 %:remove-outfile(-lpthread) \
211 %{fgnu-runtime: %{static|static-libgcc: \
212 %:replace-outfile(-lobjc libobjc-gnu.a%s); \
213 :%:replace-outfile(-lobjc -lobjc-gnu ) } }\
214 %{static|static-libgcc|static-libgfortran:%:replace-outfile(-lgfortran libgfortran.a%s)}\
215 %{static|static-libgcc|static-libstdc++|static-libgfortran:%:replace-outfile(-lgomp libgomp.a%s)}\
216 %{static|static-libgcc|static-libstdc++:%:replace-outfile(-lstdc++ libstdc++.a%s)}\
217 %{!Zdynamiclib: \
218 %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
219 %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
220 %{Zbundle:-bundle} \
221 %{Zbundle_loader*:-bundle_loader %*} \
222 %{client_name*} \
223 %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
224 } \
225 %{current_version*:%e-current_version only allowed with -dynamiclib} \
226 %{Zforce_flat_namespace:-force_flat_namespace} \
227 %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
228 %{keep_private_externs} \
229 %{private_bundle} \
230 } \
231 %{Zdynamiclib: -dylib \
232 %{Zbundle:%e-bundle not allowed with -dynamiclib} \
233 %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
234 %{client_name*:%e-client_name not allowed with -dynamiclib} \
235 %{compatibility_version*:-dylib_compatibility_version %*} \
236 %{current_version*:-dylib_current_version %*} \
237 %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
238 %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
239 %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
240 %{Zinstall_name*:-dylib_install_name %*} \
241 %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
242 %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
243 } \
244 %{Zall_load:-all_load} \
245 %{Zallowable_client*:-allowable_client %*} \
246 %{Zbind_at_load:-bind_at_load} \
247 %{Zarch_errors_fatal:-arch_errors_fatal} \
248 %{Zdead_strip:-dead_strip} \
249 %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
250 %{Zdylib_file*:-dylib_file %*} \
251 %{Zdynamic:-dynamic}\
252 %{Zexported_symbols_list*:-exported_symbols_list %*} \
253 %{Zflat_namespace:-flat_namespace} \
254 %{headerpad_max_install_names*} \
255 %{Zimage_base*:-image_base %*} \
256 %{Zinit*:-init %*} \
257 %{!mmacosx-version-min=*:-macosx_version_min %(darwin_minversion)} \
258 %{mmacosx-version-min=*:-macosx_version_min %*} \
259 %{nomultidefs} \
260 %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
261 %{Zmultiply_defined*:-multiply_defined %*} \
262 %{!Zmultiply_defined*:%{shared-libgcc: \
263 %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
264 %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
265 %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
266 %{fpie:-pie} \
267 %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
268 %{read_only_relocs} \
269 %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
270 %{Zsegaddr*:-segaddr %*} \
271 %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
272 %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
273 %{Zseg_addr_table*: -seg_addr_table %*} \
274 %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
275 %{sub_library*} %{sub_umbrella*} \
276 " LINK_SYSROOT_SPEC " \
277 %{twolevel_namespace} %{twolevel_namespace_hints} \
278 %{Zumbrella*: -umbrella %*} \
279 %{undefined*} \
280 %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
281 %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
282 %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
283 %{X} \
284 %{y*} \
285 %{w} \
286 %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit} \
287 %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
288 %{whatsloaded} %{dylinker_install_name*} \
289 %{dylinker} %{Mach} "
290
291
292 /* Machine dependent libraries. */
293
294 #define LIB_SPEC "%{!static:-lSystem}"
295
296 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
297 libraries to link against, and by not linking against libgcc_s on
298 earlier-than-10.3.9.
299
300 Note that by default, -lgcc_eh is not linked against! This is
301 because in a future version of Darwin the EH frame information may
302 be in a new format, or the fallback routine might be changed; if
303 you want to explicitly link against the static version of those
304 routines, because you know you don't need to unwind through system
305 libraries, you need to explicitly say -static-libgcc.
306
307 If it is linked against, it has to be before -lgcc, because it may
308 need symbols from -lgcc. */
309 #undef REAL_LIBGCC_SPEC
310 #define REAL_LIBGCC_SPEC \
311 "%{static-libgcc|static: -lgcc_eh -lgcc; \
312 shared-libgcc|fexceptions|fgnu-runtime: \
313 %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4) \
314 %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5) \
315 %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4) \
316 %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5) \
317 -lgcc ; \
318 :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
319 %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5) \
320 %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4) \
321 %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5) \
322 -lgcc }"
323
324 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
325
326 crt3.o provides __cxa_atexit on systems that don't have it. Since
327 it's only used with C++, which requires passing -shared-libgcc, key
328 off that to avoid unnecessarily adding a destructor to every
329 powerpc program built. */
330
331 #undef STARTFILE_SPEC
332 #define STARTFILE_SPEC \
333 "%{Zdynamiclib: %(darwin_dylib1) } \
334 %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}} \
335 %{!Zbundle:%{pg:%{static:-lgcrt0.o} \
336 %{!static:%{object:-lgcrt0.o} \
337 %{!object:%{preload:-lgcrt0.o} \
338 %{!preload:-lgcrt1.o %(darwin_crt2)}}}} \
339 %{!pg:%{static:-lcrt0.o} \
340 %{!static:%{object:-lcrt0.o} \
341 %{!object:%{preload:-lcrt0.o} \
342 %{!preload: %(darwin_crt1) \
343 %(darwin_crt2)}}}}}} \
344 %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
345
346 /* The native Darwin linker doesn't necessarily place files in the order
347 that they're specified on the link line. Thus, it is pointless
348 to put anything in ENDFILE_SPEC. */
349 /* #define ENDFILE_SPEC "" */
350
351 #define DARWIN_EXTRA_SPECS \
352 { "darwin_crt1", DARWIN_CRT1_SPEC }, \
353 { "darwin_dylib1", DARWIN_DYLIB1_SPEC }, \
354 { "darwin_minversion", DARWIN_MINVERSION_SPEC },
355
356 #define DARWIN_DYLIB1_SPEC \
357 "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o) \
358 %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
359
360 #define DARWIN_CRT1_SPEC \
361 "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o) \
362 %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)"
363
364 /* Default Darwin ASM_SPEC, very simple. */
365 #define ASM_SPEC "-arch %(darwin_arch) \
366 %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL} \
367 %{static}"
368
369 /* We still allow output of STABS. */
370
371 #define DBX_DEBUGGING_INFO 1
372
373 #define DWARF2_DEBUGGING_INFO 1
374 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
375
376 #define DEBUG_FRAME_SECTION "__DWARF,__debug_frame,regular,debug"
377 #define DEBUG_INFO_SECTION "__DWARF,__debug_info,regular,debug"
378 #define DEBUG_ABBREV_SECTION "__DWARF,__debug_abbrev,regular,debug"
379 #define DEBUG_ARANGES_SECTION "__DWARF,__debug_aranges,regular,debug"
380 #define DEBUG_MACINFO_SECTION "__DWARF,__debug_macinfo,regular,debug"
381 #define DEBUG_LINE_SECTION "__DWARF,__debug_line,regular,debug"
382 #define DEBUG_LOC_SECTION "__DWARF,__debug_loc,regular,debug"
383 #define DEBUG_PUBNAMES_SECTION "__DWARF,__debug_pubnames,regular,debug"
384 #define DEBUG_PUBTYPES_SECTION "__DWARF,__debug_pubtypes,regular,debug"
385 #define DEBUG_STR_SECTION "__DWARF,__debug_str,regular,debug"
386 #define DEBUG_RANGES_SECTION "__DWARF,__debug_ranges,regular,debug"
387
388 #define TARGET_WANT_DEBUG_PUB_SECTIONS true
389
390 /* When generating stabs debugging, use N_BINCL entries. */
391
392 #define DBX_USE_BINCL
393
394 /* There is no limit to the length of stabs strings. */
395
396 #define DBX_CONTIN_LENGTH 0
397
398 /* gdb needs a null N_SO at the end of each file for scattered loading. */
399
400 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
401
402 /* GCC's definition of 'one_only' is the same as its definition of 'weak'. */
403 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
404
405 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
406 sections. machopic_select_section ensures that weak variables go in
407 coalesced sections. Weak aliases (or any other kind of aliases) are
408 not supported. Weak symbols that aren't visible outside the .s file
409 are not supported. */
410 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS) \
411 do { \
412 if (ALIAS) \
413 { \
414 warning (0, "alias definitions not supported in Mach-O; ignored"); \
415 break; \
416 } \
417 \
418 if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL)) \
419 targetm.asm_out.globalize_label (FILE, NAME); \
420 if (DECL_EXTERNAL (DECL)) \
421 fputs ("\t.weak_reference ", FILE); \
422 else if (lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL))) \
423 break; \
424 else if (TREE_PUBLIC (DECL)) \
425 fputs ("\t.weak_definition ", FILE); \
426 else \
427 break; \
428 assemble_name (FILE, NAME); \
429 fputc ('\n', FILE); \
430 } while (0)
431
432 /* Darwin has the pthread routines in libSystem, which every program
433 links to, so there's no need for weak-ness for that. */
434 #define GTHREAD_USE_WEAK 0
435
436 /* The Darwin linker imposes two limitations on common symbols: they
437 can't have hidden visibility, and they can't appear in dylibs. As
438 a consequence, we should never use common symbols to represent
439 vague linkage. */
440 #undef USE_COMMON_FOR_ONE_ONLY
441 #define USE_COMMON_FOR_ONE_ONLY 0
442
443 /* The Darwin linker doesn't want coalesced symbols to appear in
444 a static archive's table of contents. */
445 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
446 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
447
448 /* On Darwin, we don't (at the time of writing) have linkonce sections
449 with names, so it's safe to make the class data not comdat. */
450 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
451
452 /* For efficiency, on Darwin the RTTI information that is always
453 emitted in the standard C++ library should not be COMDAT. */
454 #define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
455
456 /* We make exception information linkonce. */
457 #undef TARGET_USES_WEAK_UNWIND_INFO
458 #define TARGET_USES_WEAK_UNWIND_INFO 1
459
460 /* We need to use a nonlocal label for the start of an EH frame: the
461 Darwin linker requires that a coalesced section start with a label.
462 Unfortunately, it also requires that 'debug' sections don't contain
463 labels. */
464 #undef FRAME_BEGIN_LABEL
465 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
466
467 /* Emit a label for the FDE corresponding to DECL. EMPTY means
468 emit a label for an empty FDE. */
469 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
470
471 /* Emit a label to separate the exception table. */
472 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
473
474 /* Our profiling scheme doesn't LP labels and counter words. */
475
476 #define NO_PROFILE_COUNTERS 1
477
478 #undef INIT_SECTION_ASM_OP
479 #define INIT_SECTION_ASM_OP
480
481 #undef INVOKE__main
482
483 #define TARGET_ASM_CONSTRUCTOR machopic_asm_out_constructor
484 #define TARGET_ASM_DESTRUCTOR machopic_asm_out_destructor
485
486 /* Always prefix with an underscore. */
487
488 #define USER_LABEL_PREFIX "_"
489
490 /* A dummy symbol that will be replaced with the function base name. */
491 #define MACHOPIC_FUNCTION_BASE_NAME "<pic base>"
492
493 /* Don't output a .file directive. That is only used by the assembler for
494 error reporting. */
495 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
496 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
497
498 #undef TARGET_ASM_FILE_END
499 #define TARGET_ASM_FILE_END darwin_file_end
500
501 /* Because Mach-O relocations have a counter from 1 to 255 for the
502 section number they apply to, it is necessary to output all
503 normal sections before the LTO sections, to make sure that the
504 sections that may have relocations always have a section number
505 smaller than 255. */
506 #undef TARGET_ASM_LTO_START
507 #define TARGET_ASM_LTO_START darwin_asm_lto_start
508 #undef TARGET_ASM_LTO_END
509 #define TARGET_ASM_LTO_END darwin_asm_lto_end
510
511 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
512 fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
513
514 /* Give ObjC methods pretty symbol names. */
515
516 #undef OBJC_GEN_METHOD_LABEL
517 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
518 do { if (CAT_NAME) \
519 sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+', \
520 (CLASS_NAME), (CAT_NAME), (SEL_NAME)); \
521 else \
522 sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+', \
523 (CLASS_NAME), (SEL_NAME)); \
524 } while (0)
525
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. */
531
532 #undef ASM_DECLARE_OBJECT_NAME
533 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
534 do { \
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 \
549 byte. */ \
550 if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0) \
551 assemble_zeros (1); \
552 } while (0)
553
554 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
555 do { \
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_FUNCTION_LABEL (FILE, xname, DECL); \
569 } while (0)
570
571 #undef TARGET_ASM_DECLARE_CONSTANT_NAME
572 #define TARGET_ASM_DECLARE_CONSTANT_NAME darwin_asm_declare_constant_name
573
574 /* Wrap new method names in quotes so the assembler doesn't gag.
575 Make Objective-C internal symbols local and in doing this, we need
576 to accommodate the name mangling done by c++ on file scope locals. */
577
578
579 int darwin_label_is_anonymous_local_objc_name (const char *name);
580
581 #undef ASM_OUTPUT_LABELREF
582 #define ASM_OUTPUT_LABELREF(FILE,NAME) \
583 do { \
584 const char *xname = (NAME); \
585 if (! strcmp (xname, MACHOPIC_FUNCTION_BASE_NAME)) \
586 machopic_output_function_base_name(FILE); \
587 else if (xname[0] == '&' || xname[0] == '*') \
588 { \
589 int len = strlen (xname); \
590 if (len > 6 && !strcmp ("$stub", xname + len - 5)) \
591 machopic_validate_stub_or_non_lazy_ptr (xname); \
592 else if (len > 7 && !strcmp ("$stub\"", xname + len - 6)) \
593 machopic_validate_stub_or_non_lazy_ptr (xname); \
594 else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
595 machopic_validate_stub_or_non_lazy_ptr (xname); \
596 else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
597 machopic_validate_stub_or_non_lazy_ptr (xname); \
598 if (xname[1] != '"' && name_needs_quotes (&xname[1])) \
599 fprintf (FILE, "\"%s\"", &xname[1]); \
600 else \
601 fputs (&xname[1], FILE); \
602 } \
603 else if (xname[0] == '+' || xname[0] == '-') \
604 fprintf (FILE, "\"%s\"", xname); \
605 else if (darwin_label_is_anonymous_local_objc_name (xname)) \
606 fprintf (FILE, "L%s", xname); \
607 else if (!strncmp (xname, ".objc_class_name_", 17)) \
608 fprintf (FILE, "%s", xname); \
609 else if (xname[0] != '"' && name_needs_quotes (xname)) \
610 fprintf (FILE, "\"%s\"", xname); \
611 else \
612 asm_fprintf (FILE, "%U%s", xname); \
613 } while (0)
614
615 /* Output before executable code. */
616 #undef TEXT_SECTION_ASM_OP
617 #define TEXT_SECTION_ASM_OP "\t.text"
618
619 /* Output before writable data. */
620
621 #undef DATA_SECTION_ASM_OP
622 #define DATA_SECTION_ASM_OP "\t.data"
623
624 #undef ALIGN_ASM_OP
625 #define ALIGN_ASM_OP ".align"
626
627 #undef ASM_OUTPUT_ALIGN
628 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
629 if ((LOG) != 0) \
630 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
631
632 /* Ensure correct alignment of bss data. */
633
634 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
635 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
636 do { \
637 unsigned HOST_WIDE_INT _new_size = SIZE; \
638 fputs ("\t.lcomm ", (FILE)); \
639 assemble_name ((FILE), (NAME)); \
640 if (_new_size == 0) _new_size = 1; \
641 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
642 floor_log2 ((ALIGN) / BITS_PER_UNIT)); \
643 if ((DECL) && ((TREE_STATIC (DECL) \
644 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
645 || DECL_INITIAL (DECL))) \
646 { \
647 (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
648 machopic_define_symbol (DECL_RTL (DECL)); \
649 } \
650 } while (0)
651
652 /* The maximum alignment which the object file format can support in
653 bits. For Mach-O, this is 2^15 bytes. */
654
655 #undef MAX_OFILE_ALIGNMENT
656 #define MAX_OFILE_ALIGNMENT (0x8000 * 8)
657
658 /* The generic version, archs should over-ride where required. */
659 #define MACHOPIC_NL_SYMBOL_PTR_SECTION ".non_lazy_symbol_pointer"
660
661 /* These are used by -fbranch-probabilities */
662 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
663 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
664 "__TEXT,__unlikely,regular,pure_instructions"
665
666 /* Declare the section variables. */
667 #ifndef USED_FOR_TARGET
668 enum darwin_section_enum {
669 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
670 #include "darwin-sections.def"
671 #undef DEF_SECTION
672 NUM_DARWIN_SECTIONS
673 };
674 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
675 #endif
676
677 #undef TARGET_ASM_SELECT_SECTION
678 #define TARGET_ASM_SELECT_SECTION machopic_select_section
679 #define USE_SELECT_SECTION_FOR_FUNCTIONS
680
681 #undef TARGET_ASM_SELECT_RTX_SECTION
682 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
683 #undef TARGET_ASM_UNIQUE_SECTION
684 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
685 #undef TARGET_ASM_FUNCTION_RODATA_SECTION
686 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
687 #undef TARGET_ASM_RELOC_RW_MASK
688 #define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask
689
690
691 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME) \
692 do { \
693 if (FILE) { \
694 if (MACHOPIC_INDIRECT) \
695 fprintf (FILE, "\t.lazy_reference "); \
696 else \
697 fprintf (FILE, "\t.reference "); \
698 assemble_name (FILE, NAME); \
699 fprintf (FILE, "\n"); \
700 } \
701 } while (0)
702
703 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME) \
704 do { \
705 if (FILE) { \
706 fprintf (FILE, "\t"); \
707 assemble_name (FILE, NAME); \
708 fprintf (FILE, "=0\n"); \
709 (*targetm.asm_out.globalize_label) (FILE, NAME); \
710 } \
711 } while (0)
712
713 /* Globalizing directive for a label. */
714 #define GLOBAL_ASM_OP "\t.globl "
715 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
716
717 /* Emit an assembler directive to set visibility for a symbol. Used
718 to support visibility attribute and Darwin's private extern
719 feature. */
720 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
721 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
722
723 /* Extra attributes for Darwin. */
724 #define SUBTARGET_ATTRIBUTE_TABLE \
725 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
726 { "apple_kext_compatibility", 0, 0, false, true, false, \
727 darwin_handle_kext_attribute }, \
728 { "weak_import", 0, 0, true, false, false, \
729 darwin_handle_weak_import_attribute }
730
731 #undef ASM_GENERATE_INTERNAL_LABEL
732 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
733 sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
734
735 #undef TARGET_ASM_MARK_DECL_PRESERVED
736 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
737
738 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
739 MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
740 variable has been defined in this translation unit.
741 When porting Mach-O to new architectures you need to make
742 sure these aren't clobbered by the backend. */
743
744 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
745 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
746
747 /* Set on a symbol to indicate when fix-and-continue style code
748 generation is being used and the symbol refers to a static symbol
749 that should be rebound from new instances of a translation unit to
750 the original instance of the data. */
751
752 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
753
754 /* Symbolic names for various things we might know about a symbol. */
755
756 enum machopic_addr_class {
757 MACHOPIC_UNDEFINED,
758 MACHOPIC_DEFINED_DATA,
759 MACHOPIC_UNDEFINED_DATA,
760 MACHOPIC_DEFINED_FUNCTION,
761 MACHOPIC_UNDEFINED_FUNCTION
762 };
763
764 /* Macros defining the various PIC cases. */
765
766 #undef MACHO_DYNAMIC_NO_PIC_P
767 #define MACHO_DYNAMIC_NO_PIC_P (TARGET_MACHO_DYNAMIC_NO_PIC)
768 #undef MACHOPIC_INDIRECT
769 #define MACHOPIC_INDIRECT (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
770 #define MACHOPIC_JUST_INDIRECT (MACHO_DYNAMIC_NO_PIC_P)
771 #undef MACHOPIC_PURE
772 #define MACHOPIC_PURE (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
773
774 #undef TARGET_ENCODE_SECTION_INFO
775 #define TARGET_ENCODE_SECTION_INFO darwin_encode_section_info
776 #undef TARGET_STRIP_NAME_ENCODING
777 #define TARGET_STRIP_NAME_ENCODING default_strip_name_encoding
778
779 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH) \
780 do { \
781 const char *const stub_ = (STUB); \
782 char *buffer_ = (BUF); \
783 strcpy (buffer_, stub_); \
784 if (stub_[0] == '"') \
785 { \
786 strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\""); \
787 } \
788 else \
789 { \
790 strcpy (buffer_ + (STUB_LENGTH), "_binder"); \
791 } \
792 } while (0)
793
794 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \
795 do { \
796 const char *const symbol_ = (SYMBOL); \
797 char *buffer_ = (BUF); \
798 if (name_needs_quotes (symbol_) && symbol_[0] != '"') \
799 { \
800 sprintf (buffer_, "\"%s\"", symbol_); \
801 } \
802 else \
803 { \
804 strcpy (buffer_, symbol_); \
805 } \
806 } while (0)
807
808 /* Given a symbol name string, create the lazy pointer version
809 of the symbol name. */
810
811 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \
812 do { \
813 const char *symbol_ = (SYMBOL); \
814 char *buffer_ = (BUF); \
815 if (symbol_[0] == '"') \
816 { \
817 strcpy (buffer_, "\"L"); \
818 strcpy (buffer_ + 2, symbol_ + 1); \
819 strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\""); \
820 } \
821 else if (name_needs_quotes (symbol_)) \
822 { \
823 strcpy (buffer_, "\"L"); \
824 strcpy (buffer_ + 2, symbol_); \
825 strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\""); \
826 } \
827 else \
828 { \
829 strcpy (buffer_, "L"); \
830 strcpy (buffer_ + 1, symbol_); \
831 strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr"); \
832 } \
833 } while (0)
834
835 #define EH_FRAME_SECTION_NAME "__TEXT"
836 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
837
838 /* Java runtime class list. */
839 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
840
841 #undef ASM_PREFERRED_EH_DATA_FORMAT
842 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
843 (((CODE) == 2 && (GLOBAL) == 1) \
844 ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
845 ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
846
847 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2) \
848 darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
849
850 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE) \
851 darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
852
853 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE) \
854 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) { \
855 darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR); \
856 goto DONE; \
857 }
858
859 /* Experimentally, putting jump tables in text is faster on SPEC.
860 Also this is needed for correctness for coalesced functions. */
861
862 #ifndef JUMP_TABLES_IN_TEXT_SECTION
863 #define JUMP_TABLES_IN_TEXT_SECTION 1
864 #endif
865
866 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
867
868 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
869 #undef TARGET_ASM_NAMED_SECTION
870 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
871
872 /* Handle pragma weak and pragma pack. */
873 #define HANDLE_SYSV_PRAGMA 1
874
875 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
876
877 #define DARWIN_REGISTER_TARGET_PRAGMAS() \
878 do { \
879 if (!flag_preprocess_only) \
880 cpp_register_pragma (parse_in, NULL, "mark", \
881 darwin_pragma_ignore, false); \
882 c_register_pragma (0, "options", darwin_pragma_options); \
883 c_register_pragma (0, "segment", darwin_pragma_ignore); \
884 c_register_pragma (0, "unused", darwin_pragma_unused); \
885 c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
886 } while (0)
887
888 #undef ASM_APP_ON
889 #define ASM_APP_ON ""
890 #undef ASM_APP_OFF
891 #define ASM_APP_OFF ""
892
893 void darwin_register_frameworks (const char *, const char *, int);
894 void darwin_register_objc_includes (const char *, const char *, int);
895 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
896 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
897
898 void add_framework_path (char *);
899 #define TARGET_OPTF add_framework_path
900
901 #define TARGET_POSIX_IO
902
903 /* All new versions of Darwin have C99 functions. */
904
905 #define TARGET_C99_FUNCTIONS 1
906
907 #define WINT_TYPE "int"
908
909 /* Every program on darwin links against libSystem which contains the pthread
910 routines, so there's no need to explicitly call out when doing threaded
911 work. */
912
913 #undef GOMP_SELF_SPECS
914 #define GOMP_SELF_SPECS ""
915
916 /* Darwin can't support anchors until we can cope with the adjustments
917 to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
918 when outputting members of an anchor block and the linker can be
919 taught to keep them together or we find some other suitable
920 code-gen technique. */
921
922 #if 0
923 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
924 #else
925 #define TARGET_ASM_OUTPUT_ANCHOR NULL
926 #endif
927
928 /* Attempt to turn on execute permission for the stack. This may be
929 used by TARGET_TRAMPOLINE_INIT if the target needs it (that is,
930 if the target machine can change execute permissions on a page).
931
932 There is no way to query the execute permission of the stack, so
933 we always issue the mprotect() call.
934
935 Unfortunately it is not possible to make this namespace-clean.
936
937 Also note that no errors should be emitted by this code; it is
938 considered dangerous for library calls to send messages to
939 stdout/stderr. */
940
941 #define ENABLE_EXECUTE_STACK \
942 extern void __enable_execute_stack (void *); \
943 void \
944 __enable_execute_stack (void *addr) \
945 { \
946 extern int mprotect (void *, size_t, int); \
947 extern int getpagesize (void); \
948 static int size; \
949 static long mask; \
950 \
951 char *page, *end; \
952 \
953 if (size == 0) \
954 { \
955 size = getpagesize(); \
956 mask = ~((long) size - 1); \
957 } \
958 \
959 page = (char *) (((long) addr) & mask); \
960 end = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
961 \
962 /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \
963 (void) mprotect (page, end - page, 7); \
964 }
965
966 /* For Apple KEXTs, we make the constructors return this to match gcc
967 2.95. */
968 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
969 #define TARGET_KEXTABI flag_apple_kext
970
971 /* We have target-specific builtins. */
972 #define TARGET_FOLD_BUILTIN darwin_fold_builtin
973
974 #define TARGET_OBJC_CONSTRUCT_STRING_OBJECT \
975 darwin_objc_construct_string
976
977 #define TARGET_STRING_OBJECT_REF_TYPE_P \
978 darwin_cfstring_ref_p
979
980 #define TARGET_N_FORMAT_TYPES 1
981 #define TARGET_FORMAT_TYPES darwin_additional_format_types
982
983 #define TARGET_CHECK_STRING_OBJECT_FORMAT_ARG \
984 darwin_check_cfstring_format_arg
985
986 #define TARGET_HAS_TARGETCM 1
987
988 extern void darwin_driver_init (unsigned int *decoded_options_count,
989 struct cl_decoded_option **decoded_options);
990 #define GCC_DRIVER_HOST_INITIALIZATION \
991 darwin_driver_init (&decoded_options_count, &decoded_options)
992
993 /* The Apple assembler and linker do not support constructor priorities. */
994 #undef SUPPORTS_INIT_PRIORITY
995 #define SUPPORTS_INIT_PRIORITY 0
996
997 #endif /* CONFIG_DARWIN_H */