1/* Target definitions for Darwin (Mac OS X) systems.
2   Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
3   2005
4   Free Software Foundation, Inc.
5   Contributed by Apple Computer Inc.
6
7This file is part of GCC.
8
9GCC is free software; you can redistribute it and/or modify
10it under the terms of the GNU General Public License as published by
11the Free Software Foundation; either version 2, or (at your option)
12any later version.
13
14GCC is distributed in the hope that it will be useful,
15but WITHOUT ANY WARRANTY; without even the implied warranty of
16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17GNU General Public License for more details.
18
19You should have received a copy of the GNU General Public License
20along with GCC; see the file COPYING.  If not, write to
21the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22Boston, MA 02110-1301, USA.  */
23
24#ifndef CONFIG_DARWIN_H
25#define CONFIG_DARWIN_H
26
27/* The definitions in this file are common to all processor types
28   running Darwin, which is the kernel for Mac OS X.  Darwin is
29   basically a BSD user layer laid over a Mach kernel, then evolved
30   for many years (at NeXT) in parallel with other Unix systems.  So
31   while the runtime is a somewhat idiosyncratic Mach-based thing,
32   other definitions look like they would for a BSD variant.  */
33
34/* Although NeXT ran on many different architectures, as of Jan 2001
35   the only supported Darwin targets are PowerPC and x86.  */
36
37/* One of Darwin's NeXT legacies is the Mach-O format, which is partly
38   like a.out and partly like COFF, with additional features like
39   multi-architecture binary support.  */
40
41#define OBJECT_FORMAT_MACHO
42
43/* Suppress g++ attempt to link in the math library automatically. */
44#define MATH_LIBRARY ""
45
46/* We have atexit.  */
47
48#define HAVE_ATEXIT
49
50/* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
51
52#define DO_GLOBAL_DTORS_BODY
53
54/* The string value for __SIZE_TYPE__.  */
55
56#ifndef SIZE_TYPE
57#define SIZE_TYPE "long unsigned int"
58#endif
59
60/* Type used for ptrdiff_t, as a string used in a declaration.  */
61
62#undef  PTRDIFF_TYPE
63#define PTRDIFF_TYPE "int"
64
65/* wchar_t is int.  */
66
67#undef	WCHAR_TYPE
68#define WCHAR_TYPE "int"
69#undef	WCHAR_TYPE_SIZE
70#define WCHAR_TYPE_SIZE 32
71
72/* Default to using the NeXT-style runtime, since that's what is
73   pre-installed on Darwin systems.  */
74
75#define NEXT_OBJC_RUNTIME
76
77/* Don't default to pcc-struct-return, because gcc is the only compiler, and
78   we want to retain compatibility with older gcc versions.  */
79
80#undef	DEFAULT_PCC_STRUCT_RETURN
81#define DEFAULT_PCC_STRUCT_RETURN 0
82
83/* True if pragma ms_struct is in effect.  */
84extern GTY(()) int darwin_ms_struct;
85
86/* This table intercepts weirdo options whose names would interfere
87   with normal driver conventions, and either translates them into
88   standardly-named options, or adds a 'Z' so that they can get to
89   specs processing without interference.
90
91   Do not expand a linker option to "-Xlinker -<option>", since that
92   forfeits the ability to control via spec strings later.  However,
93   as a special exception, do this translation with -filelist, because
94   otherwise the driver will think there are no input files and quit.
95   (The alternative would be to hack the driver to recognize -filelist
96   specially, but it's simpler to use the translation table.)
97
98   Note that an option name with a prefix that matches another option
99   name, that also takes an argument, needs to be modified so the
100   prefix is different, otherwise a '*' after the shorter option will
101   match with the longer one.
102
103   The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined
104   in gcc/config/{i386,rs6000}/darwin.h, should contain any additional
105   command-line option translations specific to the particular target
106   architecture.  */
107
108#define TARGET_OPTION_TRANSLATE_TABLE \
109  { "-all_load", "-Zall_load" },  \
110  { "-allowable_client", "-Zallowable_client" },  \
111  { "-arch_errors_fatal", "-Zarch_errors_fatal" },  \
112  { "-bind_at_load", "-Zbind_at_load" },  \
113  { "-bundle", "-Zbundle" },  \
114  { "-bundle_loader", "-Zbundle_loader" },  \
115  { "-weak_reference_mismatches", "-Zweak_reference_mismatches" },  \
116  { "-dead_strip", "-Zdead_strip" }, \
117  { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \
118  { "-dependency-file", "-MF" }, \
119  { "-dylib_file", "-Zdylib_file" }, \
120  { "-dynamic", "-Zdynamic" },  \
121  { "-dynamiclib", "-Zdynamiclib" },  \
122  { "-exported_symbols_list", "-Zexported_symbols_list" },  \
123  { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \
124  { "-gused", "-g -feliminate-unused-debug-symbols" }, \
125  { "-segaddr", "-Zsegaddr" }, \
126  { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \
127  { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \
128  { "-seg_addr_table", "-Zseg_addr_table" }, \
129  { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \
130  { "-fapple-kext", "-fapple-kext -static -Wa,-static" }, \
131  { "-filelist", "-Xlinker -filelist -Xlinker" },  \
132  { "-findirect-virtual-calls", "-fapple-kext" }, \
133  { "-flat_namespace", "-Zflat_namespace" },  \
134  { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
135  { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
136  { "-framework", "-Xlinker -framework -Xlinker" },  \
137  { "-fterminated-vtables", "-fapple-kext" }, \
138  { "-image_base", "-Zimage_base" },  \
139  { "-init", "-Zinit" },  \
140  { "-install_name", "-Zinstall_name" },  \
141  { "-mkernel", "-mkernel -static -Wa,-static" }, \
142  { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
143  { "-multiply_defined", "-Zmultiply_defined" },  \
144  { "-multi_module", "-Zmulti_module" },  \
145  { "-static", "-static -Wa,-static" },  \
146  { "-single_module", "-Zsingle_module" },  \
147  { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
148  SUBTARGET_OPTION_TRANSLATE_TABLE
149
150#define SUBSUBTARGET_OVERRIDE_OPTIONS					\
151  do {									\
152    darwin_override_options ();						\
153  } while (0)
154
155/* These compiler options take n arguments.  */
156
157#undef  WORD_SWITCH_TAKES_ARG
158#define WORD_SWITCH_TAKES_ARG(STR)              \
159  (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
160   !strcmp (STR, "Zallowable_client") ? 1 :     \
161   !strcmp (STR, "arch") ? 1 :                  \
162   !strcmp (STR, "arch_only") ? 1 :             \
163   !strcmp (STR, "Zbundle_loader") ? 1 :        \
164   !strcmp (STR, "client_name") ? 1 :           \
165   !strcmp (STR, "compatibility_version") ? 1 : \
166   !strcmp (STR, "current_version") ? 1 :       \
167   !strcmp (STR, "Zdylib_file") ? 1 :           \
168   !strcmp (STR, "Zexported_symbols_list") ? 1 : \
169   !strcmp (STR, "Zimage_base") ? 1 :           \
170   !strcmp (STR, "Zinit") ? 1 :                 \
171   !strcmp (STR, "Zinstall_name") ? 1 :         \
172   !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
173   !strcmp (STR, "Zmultiply_defined") ? 1 :     \
174   !strcmp (STR, "precomp-trustfile") ? 1 :     \
175   !strcmp (STR, "read_only_relocs") ? 1 :      \
176   !strcmp (STR, "sectcreate") ? 3 :            \
177   !strcmp (STR, "sectorder") ? 3 :             \
178   !strcmp (STR, "Zsegaddr") ? 2 :              \
179   !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
180   !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
181   !strcmp (STR, "Zseg_addr_table") ? 1 :       \
182   !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
183   !strcmp (STR, "seg1addr") ? 1 :              \
184   !strcmp (STR, "segprot") ? 3 :               \
185   !strcmp (STR, "sub_library") ? 1 :           \
186   !strcmp (STR, "sub_umbrella") ? 1 :          \
187   !strcmp (STR, "umbrella") ? 1 :              \
188   !strcmp (STR, "undefined") ? 1 :             \
189   !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
190   !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
191   !strcmp (STR, "pagezero_size") ? 1 :         \
192   !strcmp (STR, "segs_read_only_addr") ? 1 :   \
193   !strcmp (STR, "segs_read_write_addr") ? 1 :  \
194   !strcmp (STR, "sectalign") ? 3 :             \
195   !strcmp (STR, "sectobjectsymbols") ? 2 :     \
196   !strcmp (STR, "segcreate") ? 3 :             \
197   !strcmp (STR, "dylinker_install_name") ? 1 : \
198   0)
199
200#define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
201    if (flag_mkernel || flag_apple_kext)				\
202      {									\
203	if (flag_use_cxa_atexit == 2)					\
204	  flag_use_cxa_atexit = 0;					\
205	/* kexts should always be built without the coalesced sections	\
206	   because the kernel loader doesn't grok such sections.  */	\
207	flag_weak = 0;							\
208	/* No RTTI in kexts.  */					\
209	flag_rtti = 0;							\
210      }									\
211  } while (0)
212
213/* Machine dependent cpp options.  Don't add more options here, add
214   them to darwin_cpp_builtins in darwin-c.c.  */
215
216#undef	CPP_SPEC
217#define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
218	" %{pthread:-D_REENTRANT}"
219
220/* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
221   precomp, libtool, and fat build additions.  Also we
222   don't specify a second %G after %L because libSystem is
223   self-contained and doesn't need to link against libgcc.a.  */
224/* In general, random Darwin linker flags should go into LINK_SPEC
225   instead of LINK_COMMAND_SPEC.  The command spec is better for
226   specifying the handling of options understood by generic Unix
227   linkers, and for positional arguments like libraries.  */
228#define LINK_COMMAND_SPEC "\
229%{!fdump=*:%{!fsyntax-only:%{!precomp:%{!c:%{!M:%{!MM:%{!E:%{!S:\
230    %{!Zdynamiclib:%(linker)}%{Zdynamiclib:/usr/bin/libtool} \
231    %l %X %{d} %{s} %{t} %{Z} \
232    %{!Zdynamiclib:%{A} %{e*} %{m} %{N} %{n} %{r} %{u*} %{x} %{z}} \
233    %{@:-o %f%u.out}%{!@:%{o*}%{!o:-o a.out}} \
234    %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
235    %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
236    %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
237    %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
238    %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}}"
239
240#ifdef TARGET_SYSTEM_ROOT
241#define LINK_SYSROOT_SPEC \
242  "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
243#else
244#define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
245#endif
246
247/* Please keep the random linker options in alphabetical order (modulo
248   'Z' and 'no' prefixes).  Options that can only go to one of libtool
249   or ld must be listed twice, under both !Zdynamiclib and
250   Zdynamiclib, with one of the cases reporting an error.  */
251/* Note that options taking arguments may appear multiple times on a
252   command line with different arguments each time, so put a * after
253   their names so all of them get passed.  */
254#define LINK_SPEC  \
255  "%{static}%{!static:-dynamic} \
256   %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
257   %{!Zdynamiclib: \
258     %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
259     %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
260     %{Zbundle:-bundle} \
261     %{Zbundle_loader*:-bundle_loader %*} \
262     %{client_name*} \
263     %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
264} \
265     %{current_version*:%e-current_version only allowed with -dynamiclib} \
266     %{Zforce_flat_namespace:-force_flat_namespace} \
267     %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
268     %{keep_private_externs} \
269     %{private_bundle} \
270    } \
271   %{Zdynamiclib: \
272     %{Zbundle:%e-bundle not allowed with -dynamiclib} \
273     %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
274     %{client_name*:%e-client_name not allowed with -dynamiclib} \
275     %{compatibility_version*} \
276     %{current_version*} \
277     %{Zforce_cpusubtype_ALL:-arch_only %(darwin_arch)} \
278     %{!Zforce_cpusubtype_ALL: -arch_only %(darwin_subarch)} \
279     %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
280     %{Zinstall_name*:-install_name %*} \
281     %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
282     %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
283    } \
284   %{Zall_load:-all_load}%{Zdynamiclib:%{!Zall_load:-noall_load}} \
285   %{Zallowable_client*:-allowable_client %*} \
286   %{Zbind_at_load:-bind_at_load} \
287   %{Zarch_errors_fatal:-arch_errors_fatal} \
288   %{Zdead_strip:-dead_strip} \
289   %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
290   %{Zdylib_file*:-dylib_file %*} \
291   %{Zdynamic:-dynamic}\
292   %{Zexported_symbols_list*:-exported_symbols_list %*} \
293   %{Zflat_namespace:-flat_namespace} \
294   %{headerpad_max_install_names*} \
295   %{Zimage_base*:-image_base %*} \
296   %{Zinit*:-init %*} \
297   %{mmacosx-version-min=*:-macosx_version_min %*} \
298   %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
299   %{nomultidefs} \
300   %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
301   %{Zmultiply_defined*:-multiply_defined %*} \
302   %{!Zmultiply_defined*:%{shared-libgcc: \
303     %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
304     %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
305   %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
306   %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
307   %{read_only_relocs} \
308   %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
309   %{Zsegaddr*:-segaddr %*} \
310   %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
311   %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
312   %{Zseg_addr_table*: -seg_addr_table %*} \
313   %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
314   %{sub_library*} %{sub_umbrella*} \
315   " LINK_SYSROOT_SPEC " \
316   %{twolevel_namespace} %{twolevel_namespace_hints} \
317   %{umbrella*} \
318   %{undefined*} \
319   %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
320   %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
321   %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
322   %{X} \
323   %{y*} \
324   %{w} \
325   %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
326   %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
327   %{whatsloaded} %{dylinker_install_name*} \
328   %{dylinker} %{Mach} "
329
330
331/* Machine dependent libraries.  */
332
333#define LIB_SPEC "%{!static:-lSystem}"
334
335/* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
336   libraries to link against, and by not linking against libgcc_s on
337   earlier-than-10.3.9.
338
339   Note that by default, -lgcc_eh is not linked against!  This is
340   because in a future version of Darwin the EH frame information may
341   be in a new format, or the fallback routine might be changed; if
342   you want to explicitly link against the static version of those
343   routines, because you know you don't need to unwind through system
344   libraries, you need to explicitly say -static-libgcc.
345
346   If it is linked against, it has to be before -lgcc, because it may
347   need symbols from -lgcc.  */
348#undef REAL_LIBGCC_SPEC
349#define REAL_LIBGCC_SPEC						   \
350   "%{static-libgcc|static: -lgcc_eh -lgcc;				   \
351      shared-libgcc|fexceptions|fgnu-runtime:				   \
352       %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)	   \
353       %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)	   \
354       -lgcc;								   \
355      :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
356       %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)	   \
357       -lgcc}"
358
359/* We specify crt0.o as -lcrt0.o so that ld will search the library path.
360
361   crt3.o provides __cxa_atexit on systems that don't have it.  Since
362   it's only used with C++, which requires passing -shared-libgcc, key
363   off that to avoid unnecessarily adding a destructor to every
364   powerpc program built.  */
365
366#undef  STARTFILE_SPEC
367#define STARTFILE_SPEC							    \
368  "%{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}			    \
369     %{!Zbundle:%{pg:%{static:-lgcrt0.o}				    \
370                     %{!static:%{object:-lgcrt0.o}			    \
371                               %{!object:%{preload:-lgcrt0.o}		    \
372                                 %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
373                %{!pg:%{static:-lcrt0.o}				    \
374                      %{!static:%{object:-lcrt0.o}			    \
375                                %{!object:%{preload:-lcrt0.o}		    \
376                                  %{!preload:-lcrt1.o %(darwin_crt2)}}}}}}  \
377  %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
378
379/* The native Darwin linker doesn't necessarily place files in the order
380   that they're specified on the link line.  Thus, it is pointless
381   to put anything in ENDFILE_SPEC.  */
382/* #define ENDFILE_SPEC "" */
383
384/* Default Darwin ASM_SPEC, very simple.  */
385#define ASM_SPEC "-arch %(darwin_arch) \
386  %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
387
388/* We use Dbx symbol format.  */
389
390#define DBX_DEBUGGING_INFO 1
391
392/* Also enable Dwarf 2 as an option.  */
393#define DWARF2_DEBUGGING_INFO
394#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
395
396#define DEBUG_FRAME_SECTION	"__DWARF,__debug_frame,regular,debug"
397#define DEBUG_INFO_SECTION	"__DWARF,__debug_info,regular,debug"
398#define DEBUG_ABBREV_SECTION	"__DWARF,__debug_abbrev,regular,debug"
399#define DEBUG_ARANGES_SECTION	"__DWARF,__debug_aranges,regular,debug"
400#define DEBUG_MACINFO_SECTION	"__DWARF,__debug_macinfo,regular,debug"
401#define DEBUG_LINE_SECTION	"__DWARF,__debug_line,regular,debug"
402#define DEBUG_LOC_SECTION	"__DWARF,__debug_loc,regular,debug"
403#define DEBUG_PUBNAMES_SECTION	"__DWARF,__debug_pubnames,regular,debug"
404#define DEBUG_STR_SECTION	"__DWARF,__debug_str,regular,debug"
405#define DEBUG_RANGES_SECTION	"__DWARF,__debug_ranges,regular,debug"
406
407/* When generating stabs debugging, use N_BINCL entries.  */
408
409#define DBX_USE_BINCL
410
411/* There is no limit to the length of stabs strings.  */
412
413#define DBX_CONTIN_LENGTH 0
414
415/* gdb needs a null N_SO at the end of each file for scattered loading.  */
416
417#define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
418
419/* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
420#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
421
422/* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
423   sections.  machopic_select_section ensures that weak variables go in
424   coalesced sections.  Weak aliases (or any other kind of aliases) are
425   not supported.  Weak symbols that aren't visible outside the .s file
426   are not supported.  */
427#define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)			\
428  do {									\
429    if (ALIAS)								\
430      {									\
431	warning (0, "alias definitions not supported in Mach-O; ignored");	\
432	break;								\
433      }									\
434 									\
435    if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))			\
436      targetm.asm_out.globalize_label (FILE, NAME);			\
437    if (DECL_EXTERNAL (DECL))						\
438      fputs ("\t.weak_reference ", FILE);				\
439    else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))	\
440	&& lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))	\
441      break;								\
442    else if (TREE_PUBLIC (DECL))					\
443      fputs ("\t.weak_definition ", FILE);				\
444    else								\
445      break;								\
446    assemble_name (FILE, NAME);						\
447    fputc ('\n', FILE);							\
448  } while (0)
449
450/* Darwin has the pthread routines in libSystem, which every program
451   links to, so there's no need for weak-ness for that.  */
452#define GTHREAD_USE_WEAK 0
453
454/* The Darwin linker imposes two limitations on common symbols: they
455   can't have hidden visibility, and they can't appear in dylibs.  As
456   a consequence, we should never use common symbols to represent
457   vague linkage. */
458#undef USE_COMMON_FOR_ONE_ONLY
459#define USE_COMMON_FOR_ONE_ONLY 0
460
461/* The Darwin linker doesn't want coalesced symbols to appear in
462   a static archive's table of contents. */
463#undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
464#define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
465
466/* On Darwin, we don't (at the time of writing) have linkonce sections
467   with names, so it's safe to make the class data not comdat.  */
468#define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
469
470/* We make exception information linkonce. */
471#undef TARGET_USES_WEAK_UNWIND_INFO
472#define TARGET_USES_WEAK_UNWIND_INFO 1
473
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
477   labels.  */
478#undef FRAME_BEGIN_LABEL
479#define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
480
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
484
485/* Emit a label to separate the exception table.  */
486#define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
487
488/* Our profiling scheme doesn't LP labels and counter words.  */
489
490#define NO_PROFILE_COUNTERS	1
491
492#undef	INIT_SECTION_ASM_OP
493#define INIT_SECTION_ASM_OP
494
495#undef	INVOKE__main
496
497#define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
498#define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
499
500/* Always prefix with an underscore.  */
501
502#define USER_LABEL_PREFIX "_"
503
504/* Don't output a .file directive.  That is only used by the assembler for
505   error reporting.  */
506#undef	TARGET_ASM_FILE_START_FILE_DIRECTIVE
507#define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
508
509#undef  TARGET_ASM_FILE_END
510#define TARGET_ASM_FILE_END darwin_file_end
511
512#define ASM_OUTPUT_SKIP(FILE,SIZE)  \
513  fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
514
515/* Give ObjC methods pretty symbol names.  */
516
517#undef	OBJC_GEN_METHOD_LABEL
518#define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
519  do { if (CAT_NAME)							\
520	 sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',		\
521		  (CLASS_NAME), (CAT_NAME), (SEL_NAME));		\
522       else								\
523	 sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',		\
524		  (CLASS_NAME), (SEL_NAME));				\
525     } while (0)
526
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.  */
532
533#undef ASM_DECLARE_OBJECT_NAME
534#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)			\
535  do {									\
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		\
550       byte.  */							\
551    if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)			\
552      assemble_zeros (1);						\
553  } while (0)
554
555#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)			\
556  do {									\
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);					\
570  } while (0)
571
572#define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)	\
573  do {								\
574    ASM_OUTPUT_LABEL (FILE, NAME);				\
575    /* Darwin doesn't support zero-size objects, so give them a	\
576       byte.  */						\
577    if ((SIZE) == 0)						\
578      assemble_zeros (1);					\
579  } while (0)
580
581/* Wrap new method names in quotes so the assembler doesn't gag.
582   Make Objective-C internal symbols local.  */
583
584#undef	ASM_OUTPUT_LABELREF
585#define ASM_OUTPUT_LABELREF(FILE,NAME)					     \
586  do {									     \
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] == '*')			     \
591         {								     \
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]);			     \
603	   else								     \
604	     fputs (&xname[1], FILE); 					     \
605	 }								     \
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);				     \
614       else								     \
615         asm_fprintf (FILE, "%U%s", xname);				     \
616  } while (0)
617
618/* Output before executable code.  */
619#undef TEXT_SECTION_ASM_OP
620#define TEXT_SECTION_ASM_OP "\t.text"
621
622/* Output before writable data.  */
623
624#undef DATA_SECTION_ASM_OP
625#define DATA_SECTION_ASM_OP "\t.data"
626
627#undef	ALIGN_ASM_OP
628#define ALIGN_ASM_OP		".align"
629
630#undef	ASM_OUTPUT_ALIGN
631#define ASM_OUTPUT_ALIGN(FILE,LOG)	\
632  if ((LOG) != 0)			\
633    fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
634
635/* Ensure correct alignment of bss data.  */
636
637#undef	ASM_OUTPUT_ALIGNED_DECL_LOCAL
638#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)	\
639  do {									\
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)))					\
649      {									\
650	(* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);	\
651	machopic_define_symbol (DECL_RTL (DECL));			\
652      }									\
653  } while (0)
654
655/* The maximum alignment which the object file format can support in
656   bits.  For Mach-O, this is 2^15 bytes.  */
657
658#undef	MAX_OFILE_ALIGNMENT
659#define MAX_OFILE_ALIGNMENT (0x8000 * 8)
660
661/* Declare the section variables.  */
662#ifndef USED_FOR_TARGET
663enum darwin_section_enum {
664#define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
665#include "darwin-sections.def"
666#undef DEF_SECTION
667  NUM_DARWIN_SECTIONS
668};
669extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
670#endif
671
672#undef	TARGET_ASM_SELECT_SECTION
673#define TARGET_ASM_SELECT_SECTION machopic_select_section
674#define USE_SELECT_SECTION_FOR_FUNCTIONS
675
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
684
685
686#define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)			\
687    do {								\
688	 if (FILE) {							\
689	   if (MACHOPIC_INDIRECT)					\
690	     fprintf (FILE, "\t.lazy_reference ");			\
691	   else								\
692	     fprintf (FILE, "\t.reference ");				\
693	   assemble_name (FILE, NAME);					\
694	   fprintf (FILE, "\n");					\
695	 }                                                              \
696       } while (0)
697
698#define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)				\
699    do {								\
700	 if (FILE) {							\
701	   fprintf (FILE, "\t");					\
702	   assemble_name (FILE, NAME);					\
703	   fprintf (FILE, "=0\n");					\
704	   (*targetm.asm_out.globalize_label) (FILE, NAME);		\
705	 }								\
706       } while (0)
707
708/* Globalizing directive for a label.  */
709#define GLOBAL_ASM_OP ".globl "
710#define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
711
712/* Emit an assembler directive to set visibility for a symbol.  Used
713   to support visibility attribute and Darwin's private extern
714   feature.  */
715#undef TARGET_ASM_ASSEMBLE_VISIBILITY
716#define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
717
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 }
725
726#undef ASM_GENERATE_INTERNAL_LABEL
727#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)	\
728  sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
729
730#undef TARGET_ASM_MARK_DECL_PRESERVED
731#define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
732
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.  */
738
739#define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
740#define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
741
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.  */
746
747#define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
748
749/* Symbolic names for various things we might know about a symbol.  */
750
751enum machopic_addr_class {
752  MACHOPIC_UNDEFINED,
753  MACHOPIC_DEFINED_DATA,
754  MACHOPIC_UNDEFINED_DATA,
755  MACHOPIC_DEFINED_FUNCTION,
756  MACHOPIC_UNDEFINED_FUNCTION
757};
758
759/* Macros defining the various PIC cases.  */
760
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)
765
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
770
771#define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)		\
772  do {								\
773    const char *const stub_ = (STUB);				\
774    char *buffer_ = (BUF);					\
775    strcpy (buffer_, stub_);					\
776    if (stub_[0] == '"')					\
777      {								\
778	strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");	\
779      }								\
780    else							\
781      {								\
782	strcpy (buffer_ + (STUB_LENGTH), "_binder");		\
783      }								\
784  } while (0)
785
786#define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)	\
787  do {								\
788    const char *const symbol_ = (SYMBOL);			\
789    char *buffer_ = (BUF);					\
790    if (name_needs_quotes (symbol_) && symbol_[0] != '"')	\
791      {								\
792	  sprintf (buffer_, "\"%s\"", symbol_);			\
793      }								\
794    else							\
795      {								\
796	strcpy (buffer_, symbol_);				\
797      }								\
798  } while (0)
799
800/* Given a symbol name string, create the lazy pointer version
801   of the symbol name.  */
802
803#define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)	\
804  do {								\
805    const char *symbol_ = (SYMBOL);                             \
806    char *buffer_ = (BUF);					\
807    if (symbol_[0] == '"')					\
808      {								\
809        strcpy (buffer_, "\"L");				\
810        strcpy (buffer_ + 2, symbol_ + 1);			\
811	strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");	\
812      }								\
813    else if (name_needs_quotes (symbol_))			\
814      {								\
815        strcpy (buffer_, "\"L");				\
816        strcpy (buffer_ + 2, symbol_);				\
817	strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");	\
818      }								\
819    else							\
820      {								\
821        strcpy (buffer_, "L");					\
822        strcpy (buffer_ + 1, symbol_);				\
823	strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");	\
824      }								\
825  } while (0)
826
827#define EH_FRAME_SECTION_NAME   "__TEXT"
828#define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
829
830/* Java runtime class list.  */
831#define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
832
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)
838
839#define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
840  darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
841
842#define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
843  darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
844
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);					\
848	goto DONE;									\
849      }
850
851/* Experimentally, putting jump tables in text is faster on SPEC.
852   Also this is needed for correctness for coalesced functions.  */
853
854#ifndef JUMP_TABLES_IN_TEXT_SECTION
855#define JUMP_TABLES_IN_TEXT_SECTION 1
856#endif
857
858#define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
859
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
863
864/* Handle pragma weak and pragma pack.  */
865#define HANDLE_SYSV_PRAGMA 1
866
867#define HANDLE_PRAGMA_PACK_PUSH_POP 1
868
869#define DARWIN_REGISTER_TARGET_PRAGMAS()			\
870  do {								\
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); \
876  } while (0)
877
878#undef ASM_APP_ON
879#define ASM_APP_ON ""
880#undef ASM_APP_OFF
881#define ASM_APP_OFF ""
882
883void darwin_register_frameworks (const char *, const char *, int);
884void 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
887
888void add_framework_path (char *);
889#define TARGET_OPTF add_framework_path
890
891#define TARGET_POSIX_IO
892
893/* All new versions of Darwin have C99 functions.  */
894
895#define TARGET_C99_FUNCTIONS 1
896
897#define WINT_TYPE "int"
898
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
901   work.  */
902
903#undef GOMP_SELF_SPECS
904#define GOMP_SELF_SPECS ""
905
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.  */
911
912#if 0
913#define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
914#else
915#define TARGET_ASM_OUTPUT_ANCHOR NULL
916#endif
917
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).
921
922    There is no way to query the execute permission of the stack, so
923    we always issue the mprotect() call.
924
925    Unfortunately it is not possible to make this namespace-clean.
926
927    Also note that no errors should be emitted by this code; it is
928    considered dangerous for library calls to send messages to
929    stdout/stderr.  */
930
931#define ENABLE_EXECUTE_STACK                                            \
932extern void __enable_execute_stack (void *);                            \
933void                                                                    \
934__enable_execute_stack (void *addr)                                     \
935{                                                                       \
936   extern int mprotect (void *, size_t, int);                           \
937   extern int getpagesize (void);					\
938   static int size;                                                     \
939   static long mask;                                                    \
940                                                                        \
941   char *page, *end;                                                    \
942                                                                        \
943   if (size == 0)                                                       \
944     {                                                                  \
945       size = getpagesize();						\
946       mask = ~((long) size - 1);                                       \
947     }                                                                  \
948                                                                        \
949   page = (char *) (((long) addr) & mask);                              \
950   end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
951                                                                        \
952   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
953   (void) mprotect (page, end - page, 7);                               \
954}
955
956/* For Apple KEXTs, we make the constructors return this to match gcc
957   2.95.  */
958#define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
959extern int flag_mkernel;
960extern int flag_apple_kext;
961#define TARGET_KEXTABI flag_apple_kext
962
963#endif /* CONFIG_DARWIN_H */
964