OSDN Git Service

Add ability to generate DWARF pubtypes section if DEBUG_PUBTYPES_SECTION
[pf3gnuchains/gcc-fork.git] / gcc / config / darwin.h
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
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 2, 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 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.  */
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 /* Don't assume anything about the header files.  */
44 #define NO_IMPLICIT_EXTERN_C
45
46 /* Suppress g++ attempt to link in the math library automatically. */
47 #define MATH_LIBRARY ""
48
49 /* We have atexit.  */
50
51 #define HAVE_ATEXIT
52
53 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
54
55 #define DO_GLOBAL_DTORS_BODY
56
57 /* The string value for __SIZE_TYPE__.  */
58
59 #ifndef SIZE_TYPE
60 #define SIZE_TYPE "long unsigned int"
61 #endif
62
63 /* Type used for ptrdiff_t, as a string used in a declaration.  */
64
65 #undef  PTRDIFF_TYPE
66 #define PTRDIFF_TYPE "int"
67
68 /* wchar_t is int.  */
69
70 #undef  WCHAR_TYPE
71 #define WCHAR_TYPE "int"
72 #undef  WCHAR_TYPE_SIZE
73 #define WCHAR_TYPE_SIZE 32
74
75 /* Default to using the NeXT-style runtime, since that's what is
76    pre-installed on Darwin systems.  */
77
78 #define NEXT_OBJC_RUNTIME
79
80 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
81    we want to retain compatibility with older gcc versions.  */
82
83 #undef  DEFAULT_PCC_STRUCT_RETURN
84 #define DEFAULT_PCC_STRUCT_RETURN 0
85
86 /* True if pragma ms_struct is in effect.  */
87 extern GTY(()) int darwin_ms_struct;
88
89 /* This table intercepts weirdo options whose names would interfere
90    with normal driver conventions, and either translates them into
91    standardly-named options, or adds a 'Z' so that they can get to
92    specs processing without interference.
93
94    Do not expand a linker option to "-Xlinker -<option>", since that
95    forfeits the ability to control via spec strings later.  However,
96    as a special exception, do this translation with -filelist, because
97    otherwise the driver will think there are no input files and quit.
98    (The alternative would be to hack the driver to recognize -filelist
99    specially, but it's simpler to use the translation table.)
100
101    Note that an option name with a prefix that matches another option
102    name, that also takes an argument, needs to be modified so the
103    prefix is different, otherwise a '*' after the shorter option will
104    match with the longer one.
105
106    The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined
107    in gcc/config/{i386,rs6000}/darwin.h, should contain any additional
108    command-line option translations specific to the particular target
109    architecture.  */
110
111 #define TARGET_OPTION_TRANSLATE_TABLE \
112   { "-all_load", "-Zall_load" },  \
113   { "-allowable_client", "-Zallowable_client" },  \
114   { "-arch_errors_fatal", "-Zarch_errors_fatal" },  \
115   { "-bind_at_load", "-Zbind_at_load" },  \
116   { "-bundle", "-Zbundle" },  \
117   { "-bundle_loader", "-Zbundle_loader" },  \
118   { "-weak_reference_mismatches", "-Zweak_reference_mismatches" },  \
119   { "-dead_strip", "-Zdead_strip" }, \
120   { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \
121   { "-dependency-file", "-MF" }, \
122   { "-dylib_file", "-Zdylib_file" }, \
123   { "-dynamic", "-Zdynamic" },  \
124   { "-dynamiclib", "-Zdynamiclib" },  \
125   { "-exported_symbols_list", "-Zexported_symbols_list" },  \
126   { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \
127   { "-gused", "-g -feliminate-unused-debug-symbols" }, \
128   { "-segaddr", "-Zsegaddr" }, \
129   { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \
130   { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \
131   { "-seg_addr_table", "-Zseg_addr_table" }, \
132   { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \
133   { "-fapple-kext", "-fapple-kext -static -Wa,-static" }, \
134   { "-filelist", "-Xlinker -filelist -Xlinker" },  \
135   { "-findirect-virtual-calls", "-fapple-kext" }, \
136   { "-flat_namespace", "-Zflat_namespace" },  \
137   { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
138   { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
139   { "-framework", "-Xlinker -framework -Xlinker" },  \
140   { "-fterminated-vtables", "-fapple-kext" }, \
141   { "-image_base", "-Zimage_base" },  \
142   { "-init", "-Zinit" },  \
143   { "-install_name", "-Zinstall_name" },  \
144   { "-mkernel", "-mkernel -static -Wa,-static" }, \
145   { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
146   { "-multiply_defined", "-Zmultiply_defined" },  \
147   { "-multi_module", "-Zmulti_module" },  \
148   { "-static", "-static -Wa,-static" },  \
149   { "-single_module", "-Zsingle_module" },  \
150   { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
151   SUBTARGET_OPTION_TRANSLATE_TABLE
152
153 #define SUBSUBTARGET_OVERRIDE_OPTIONS                                   \
154   do {                                                                  \
155     darwin_override_options ();                                         \
156   } while (0)
157
158 /* These compiler options take n arguments.  */
159
160 #undef  WORD_SWITCH_TAKES_ARG
161 #define WORD_SWITCH_TAKES_ARG(STR)              \
162   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
163    !strcmp (STR, "Zallowable_client") ? 1 :     \
164    !strcmp (STR, "arch") ? 1 :                  \
165    !strcmp (STR, "arch_only") ? 1 :             \
166    !strcmp (STR, "Zbundle_loader") ? 1 :        \
167    !strcmp (STR, "client_name") ? 1 :           \
168    !strcmp (STR, "compatibility_version") ? 1 : \
169    !strcmp (STR, "current_version") ? 1 :       \
170    !strcmp (STR, "Zdylib_file") ? 1 :           \
171    !strcmp (STR, "Zexported_symbols_list") ? 1 : \
172    !strcmp (STR, "Zimage_base") ? 1 :           \
173    !strcmp (STR, "Zinit") ? 1 :                 \
174    !strcmp (STR, "Zinstall_name") ? 1 :         \
175    !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
176    !strcmp (STR, "Zmultiply_defined") ? 1 :     \
177    !strcmp (STR, "precomp-trustfile") ? 1 :     \
178    !strcmp (STR, "read_only_relocs") ? 1 :      \
179    !strcmp (STR, "sectcreate") ? 3 :            \
180    !strcmp (STR, "sectorder") ? 3 :             \
181    !strcmp (STR, "Zsegaddr") ? 2 :              \
182    !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
183    !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
184    !strcmp (STR, "Zseg_addr_table") ? 1 :       \
185    !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
186    !strcmp (STR, "seg1addr") ? 1 :              \
187    !strcmp (STR, "segprot") ? 3 :               \
188    !strcmp (STR, "sub_library") ? 1 :           \
189    !strcmp (STR, "sub_umbrella") ? 1 :          \
190    !strcmp (STR, "umbrella") ? 1 :              \
191    !strcmp (STR, "undefined") ? 1 :             \
192    !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
193    !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
194    !strcmp (STR, "pagezero_size") ? 1 :         \
195    !strcmp (STR, "segs_read_only_addr") ? 1 :   \
196    !strcmp (STR, "segs_read_write_addr") ? 1 :  \
197    !strcmp (STR, "sectalign") ? 3 :             \
198    !strcmp (STR, "sectobjectsymbols") ? 2 :     \
199    !strcmp (STR, "segcreate") ? 3 :             \
200    !strcmp (STR, "dylinker_install_name") ? 1 : \
201    0)
202
203 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
204     if (flag_mkernel || flag_apple_kext)                                \
205       {                                                                 \
206         if (flag_use_cxa_atexit == 2)                                   \
207           flag_use_cxa_atexit = 0;                                      \
208         /* kexts should always be built without the coalesced sections  \
209            because the kernel loader doesn't grok such sections.  */    \
210         flag_weak = 0;                                                  \
211         /* No RTTI in kexts.  */                                        \
212         flag_rtti = 0;                                                  \
213       }                                                                 \
214   } while (0)
215
216 /* Machine dependent cpp options.  Don't add more options here, add
217    them to darwin_cpp_builtins in darwin-c.c.  */
218
219 #undef  CPP_SPEC
220 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
221         " %{pthread:-D_REENTRANT}"
222
223 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
224    precomp, libtool, and fat build additions.  Also we
225    don't specify a second %G after %L because libSystem is
226    self-contained and doesn't need to link against libgcc.a.  */
227 /* In general, random Darwin linker flags should go into LINK_SPEC
228    instead of LINK_COMMAND_SPEC.  The command spec is better for
229    specifying the handling of options understood by generic Unix
230    linkers, and for positional arguments like libraries.  */
231 #define LINK_COMMAND_SPEC "\
232 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
233     %{!Zdynamiclib:%(linker)}%{Zdynamiclib:/usr/bin/libtool} \
234     %l %X %{d} %{s} %{t} %{Z} \
235     %{!Zdynamiclib:%{A} %{e*} %{m} %{N} %{n} %{r} %{u*} %{x} %{z}} \
236     %{o*}%{!o:-o a.out} \
237     %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
238     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
239     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
240     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
241     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
242 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
243     %{.c|.cc|.C|.cpp|.c++|.CPP|.m|.mm: \
244     %{g*:%{!gstabs*:%{!gnone: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
245
246 #ifdef TARGET_SYSTEM_ROOT
247 #define LINK_SYSROOT_SPEC \
248   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
249 #else
250 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
251 #endif
252
253 /* Please keep the random linker options in alphabetical order (modulo
254    'Z' and 'no' prefixes).  Options that can only go to one of libtool
255    or ld must be listed twice, under both !Zdynamiclib and
256    Zdynamiclib, with one of the cases reporting an error.  */
257 /* Note that options taking arguments may appear multiple times on a
258    command line with different arguments each time, so put a * after
259    their names so all of them get passed.  */
260 #define LINK_SPEC  \
261   "%{static}%{!static:-dynamic} \
262    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
263    %{!Zdynamiclib: \
264      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
265      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
266      %{Zbundle:-bundle} \
267      %{Zbundle_loader*:-bundle_loader %*} \
268      %{client_name*} \
269      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
270 } \
271      %{current_version*:%e-current_version only allowed with -dynamiclib} \
272      %{Zforce_flat_namespace:-force_flat_namespace} \
273      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
274      %{keep_private_externs} \
275      %{private_bundle} \
276     } \
277    %{Zdynamiclib: \
278      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
279      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
280      %{client_name*:%e-client_name not allowed with -dynamiclib} \
281      %{compatibility_version*} \
282      %{current_version*} \
283      %{Zforce_cpusubtype_ALL:-arch_only %(darwin_arch)} \
284      %{!Zforce_cpusubtype_ALL: -arch_only %(darwin_subarch)} \
285      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
286      %{Zinstall_name*:-install_name %*} \
287      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
288      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
289     } \
290    %{Zall_load:-all_load}%{Zdynamiclib:%{!Zall_load:-noall_load}} \
291    %{Zallowable_client*:-allowable_client %*} \
292    %{Zbind_at_load:-bind_at_load} \
293    %{Zarch_errors_fatal:-arch_errors_fatal} \
294    %{Zdead_strip:-dead_strip} \
295    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
296    %{Zdylib_file*:-dylib_file %*} \
297    %{Zdynamic:-dynamic}\
298    %{Zexported_symbols_list*:-exported_symbols_list %*} \
299    %{Zflat_namespace:-flat_namespace} \
300    %{headerpad_max_install_names*} \
301    %{Zimage_base*:-image_base %*} \
302    %{Zinit*:-init %*} \
303    %{mmacosx-version-min=*:-macosx_version_min %*} \
304    %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
305    %{nomultidefs} \
306    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
307    %{Zmultiply_defined*:-multiply_defined %*} \
308    %{!Zmultiply_defined*:%{shared-libgcc: \
309      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
310      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
311    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
312    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
313    %{read_only_relocs} \
314    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
315    %{Zsegaddr*:-segaddr %*} \
316    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
317    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
318    %{Zseg_addr_table*: -seg_addr_table %*} \
319    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
320    %{sub_library*} %{sub_umbrella*} \
321    " LINK_SYSROOT_SPEC " \
322    %{twolevel_namespace} %{twolevel_namespace_hints} \
323    %{umbrella*} \
324    %{undefined*} \
325    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
326    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
327    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
328    %{X} \
329    %{y*} \
330    %{w} \
331    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
332    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
333    %{whatsloaded} %{dylinker_install_name*} \
334    %{dylinker} %{Mach} "
335
336
337 /* Machine dependent libraries.  */
338
339 #define LIB_SPEC "%{!static:-lSystem}"
340
341 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
342    libraries to link against, and by not linking against libgcc_s on
343    earlier-than-10.3.9.
344
345    Note that by default, -lgcc_eh is not linked against!  This is
346    because in a future version of Darwin the EH frame information may
347    be in a new format, or the fallback routine might be changed; if
348    you want to explicitly link against the static version of those
349    routines, because you know you don't need to unwind through system
350    libraries, you need to explicitly say -static-libgcc.
351
352    If it is linked against, it has to be before -lgcc, because it may
353    need symbols from -lgcc.  */
354 #undef REAL_LIBGCC_SPEC
355 #define REAL_LIBGCC_SPEC                                                   \
356    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
357       shared-libgcc|fexceptions:                                           \
358        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
359        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
360        -lgcc;                                                              \
361       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
362        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
363        -lgcc}"
364
365 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
366
367    crt3.o provides __cxa_atexit on systems that don't have it.  Since
368    it's only used with C++, which requires passing -shared-libgcc, key
369    off that to avoid unnecessarily adding a destructor to every
370    powerpc program built.  */
371
372 #undef  STARTFILE_SPEC
373 #define STARTFILE_SPEC                                                      \
374   "%{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
375      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
376                      %{!static:%{object:-lgcrt0.o}                          \
377                                %{!object:%{preload:-lgcrt0.o}               \
378                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
379                 %{!pg:%{static:-lcrt0.o}                                    \
380                       %{!static:%{object:-lcrt0.o}                          \
381                                 %{!object:%{preload:-lcrt0.o}               \
382                                   %{!preload:-lcrt1.o %(darwin_crt2)}}}}}}  \
383   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
384
385 /* The native Darwin linker doesn't necessarily place files in the order
386    that they're specified on the link line.  Thus, it is pointless
387    to put anything in ENDFILE_SPEC.  */
388 /* #define ENDFILE_SPEC "" */
389
390 /* Default Darwin ASM_SPEC, very simple.  */
391 #define ASM_SPEC "-arch %(darwin_arch) \
392   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
393
394 /* We still allow output of STABS.  */
395
396 #define DBX_DEBUGGING_INFO 1
397
398 /* Prefer DWARF2.  */
399 #define DWARF2_DEBUGGING_INFO
400 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
401
402 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
403 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
404 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
405 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
406 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
407 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
408 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
409 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
410 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
411 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
412 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
413
414 /* When generating stabs debugging, use N_BINCL entries.  */
415
416 #define DBX_USE_BINCL
417
418 /* There is no limit to the length of stabs strings.  */
419
420 #define DBX_CONTIN_LENGTH 0
421
422 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
423
424 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
425
426 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
427 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
428
429 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
430    sections.  machopic_select_section ensures that weak variables go in
431    coalesced sections.  Weak aliases (or any other kind of aliases) are
432    not supported.  Weak symbols that aren't visible outside the .s file
433    are not supported.  */
434 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
435   do {                                                                  \
436     if (ALIAS)                                                          \
437       {                                                                 \
438         warning (0, "alias definitions not supported in Mach-O; ignored");      \
439         break;                                                          \
440       }                                                                 \
441                                                                         \
442     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
443       targetm.asm_out.globalize_label (FILE, NAME);                     \
444     if (DECL_EXTERNAL (DECL))                                           \
445       fputs ("\t.weak_reference ", FILE);                               \
446     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
447         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
448       break;                                                            \
449     else if (TREE_PUBLIC (DECL))                                        \
450       fputs ("\t.weak_definition ", FILE);                              \
451     else                                                                \
452       break;                                                            \
453     assemble_name (FILE, NAME);                                         \
454     fputc ('\n', FILE);                                                 \
455   } while (0)
456
457 /* Darwin has the pthread routines in libSystem, which every program
458    links to, so there's no need for weak-ness for that.  */
459 #define GTHREAD_USE_WEAK 0
460
461 /* The Darwin linker imposes two limitations on common symbols: they
462    can't have hidden visibility, and they can't appear in dylibs.  As
463    a consequence, we should never use common symbols to represent
464    vague linkage. */
465 #undef USE_COMMON_FOR_ONE_ONLY
466 #define USE_COMMON_FOR_ONE_ONLY 0
467
468 /* The Darwin linker doesn't want coalesced symbols to appear in
469    a static archive's table of contents. */
470 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
471 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
472
473 /* On Darwin, we don't (at the time of writing) have linkonce sections
474    with names, so it's safe to make the class data not comdat.  */
475 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
476
477 /* We make exception information linkonce. */
478 #undef TARGET_USES_WEAK_UNWIND_INFO
479 #define TARGET_USES_WEAK_UNWIND_INFO 1
480
481 /* We need to use a nonlocal label for the start of an EH frame: the
482    Darwin linker requires that a coalesced section start with a label.
483    Unfortunately, it also requires that 'debug' sections don't contain
484    labels.  */
485 #undef FRAME_BEGIN_LABEL
486 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
487
488 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
489    emit a label for an empty FDE. */
490 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
491
492 /* Emit a label to separate the exception table.  */
493 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
494
495 /* Our profiling scheme doesn't LP labels and counter words.  */
496
497 #define NO_PROFILE_COUNTERS     1
498
499 #undef  INIT_SECTION_ASM_OP
500 #define INIT_SECTION_ASM_OP
501
502 #undef  INVOKE__main
503
504 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
505 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
506
507 /* Always prefix with an underscore.  */
508
509 #define USER_LABEL_PREFIX "_"
510
511 /* Don't output a .file directive.  That is only used by the assembler for
512    error reporting.  */
513 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
514 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
515
516 #undef  TARGET_ASM_FILE_END
517 #define TARGET_ASM_FILE_END darwin_file_end
518
519 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
520   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
521
522 /* Give ObjC methods pretty symbol names.  */
523
524 #undef  OBJC_GEN_METHOD_LABEL
525 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
526   do { if (CAT_NAME)                                                    \
527          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
528                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
529        else                                                             \
530          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
531                   (CLASS_NAME), (SEL_NAME));                            \
532      } while (0)
533
534 /* The RTTI data (e.g., __ti4name) is common and public (and static),
535    but it does need to be referenced via indirect PIC data pointers.
536    The machopic_define_symbol calls are telling the machopic subsystem
537    that the name *is* defined in this module, so it doesn't need to
538    make them indirect.  */
539
540 #undef ASM_DECLARE_OBJECT_NAME
541 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
542   do {                                                                  \
543     const char *xname = NAME;                                           \
544     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
545       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
546     if (! DECL_WEAK (DECL)                                              \
547         && ((TREE_STATIC (DECL)                                         \
548              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
549             || DECL_INITIAL (DECL)))                                    \
550         machopic_define_symbol (DECL_RTL (DECL));                       \
551     if ((TREE_STATIC (DECL)                                             \
552          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
553         || DECL_INITIAL (DECL))                                         \
554       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
555     ASM_OUTPUT_LABEL (FILE, xname);                                     \
556     /* Darwin doesn't support zero-size objects, so give them a         \
557        byte.  */                                                        \
558     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
559       assemble_zeros (1);                                               \
560   } while (0)
561
562 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
563   do {                                                                  \
564     const char *xname = NAME;                                           \
565     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
566       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
567     if (! DECL_WEAK (DECL)                                              \
568         && ((TREE_STATIC (DECL)                                         \
569              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
570             || DECL_INITIAL (DECL)))                                    \
571         machopic_define_symbol (DECL_RTL (DECL));                       \
572     if ((TREE_STATIC (DECL)                                             \
573          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
574         || DECL_INITIAL (DECL))                                         \
575       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
576     ASM_OUTPUT_LABEL (FILE, xname);                                     \
577   } while (0)
578
579 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
580   do {                                                          \
581     ASM_OUTPUT_LABEL (FILE, NAME);                              \
582     /* Darwin doesn't support zero-size objects, so give them a \
583        byte.  */                                                \
584     if ((SIZE) == 0)                                            \
585       assemble_zeros (1);                                       \
586   } while (0)
587
588 /* Wrap new method names in quotes so the assembler doesn't gag.
589    Make Objective-C internal symbols local.  */
590
591 #undef  ASM_OUTPUT_LABELREF
592 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
593   do {                                                                       \
594        const char *xname = (NAME);                                           \
595        if (! strcmp (xname, "<pic base>"))                                   \
596          machopic_output_function_base_name(FILE);                           \
597        else if (xname[0] == '&' || xname[0] == '*')                          \
598          {                                                                   \
599            int len = strlen (xname);                                         \
600            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
601              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
602            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
603              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
604            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
605              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
606            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
607              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
608            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
609              fprintf (FILE, "\"%s\"", &xname[1]);                            \
610            else                                                              \
611              fputs (&xname[1], FILE);                                        \
612          }                                                                   \
613        else if (xname[0] == '+' || xname[0] == '-')                          \
614          fprintf (FILE, "\"%s\"", xname);                                    \
615        else if (!strncmp (xname, "_OBJC_", 6))                               \
616          fprintf (FILE, "L%s", xname);                                       \
617        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
618          fprintf (FILE, "%s", xname);                                        \
619        else if (xname[0] != '"' && name_needs_quotes (xname))                \
620          fprintf (FILE, "\"%s\"", xname);                                    \
621        else                                                                  \
622          asm_fprintf (FILE, "%U%s", xname);                                  \
623   } while (0)
624
625 /* Output before executable code.  */
626 #undef TEXT_SECTION_ASM_OP
627 #define TEXT_SECTION_ASM_OP "\t.text"
628
629 /* Output before writable data.  */
630
631 #undef DATA_SECTION_ASM_OP
632 #define DATA_SECTION_ASM_OP "\t.data"
633
634 #undef  ALIGN_ASM_OP
635 #define ALIGN_ASM_OP            ".align"
636
637 #undef  ASM_OUTPUT_ALIGN
638 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
639   if ((LOG) != 0)                       \
640     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
641
642 /* Ensure correct alignment of bss data.  */
643
644 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
645 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
646   do {                                                                  \
647     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
648     fputs (".lcomm ", (FILE));                                          \
649     assemble_name ((FILE), (NAME));                                     \
650     if (_new_size == 0) _new_size = 1;                                  \
651     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
652              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
653     if ((DECL) && ((TREE_STATIC (DECL)                                  \
654          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
655         || DECL_INITIAL (DECL)))                                        \
656       {                                                                 \
657         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
658         machopic_define_symbol (DECL_RTL (DECL));                       \
659       }                                                                 \
660   } while (0)
661
662 /* The maximum alignment which the object file format can support.
663    For Mach-O, this is 2^15.  */
664
665 #undef  MAX_OFILE_ALIGNMENT
666 #define MAX_OFILE_ALIGNMENT 0x8000
667
668 /* Declare the section variables.  */
669 #ifndef USED_FOR_TARGET
670 enum darwin_section_enum {
671 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
672 #include "darwin-sections.def"
673 #undef DEF_SECTION
674   NUM_DARWIN_SECTIONS
675 };
676 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
677 #endif
678
679 #undef  TARGET_ASM_SELECT_SECTION
680 #define TARGET_ASM_SELECT_SECTION machopic_select_section
681 #define USE_SELECT_SECTION_FOR_FUNCTIONS
682
683 #undef  TARGET_ASM_SELECT_RTX_SECTION
684 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
685 #undef  TARGET_ASM_UNIQUE_SECTION
686 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
687 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
688 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
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 ".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 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
767 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
768 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
769 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
770
771 #undef TARGET_ENCODE_SECTION_INFO
772 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
773 #undef TARGET_STRIP_NAME_ENCODING
774 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
775
776 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
777   do {                                                          \
778     const char *const stub_ = (STUB);                           \
779     char *buffer_ = (BUF);                                      \
780     strcpy (buffer_, stub_);                                    \
781     if (stub_[0] == '"')                                        \
782       {                                                         \
783         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
784       }                                                         \
785     else                                                        \
786       {                                                         \
787         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
788       }                                                         \
789   } while (0)
790
791 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
792   do {                                                          \
793     const char *const symbol_ = (SYMBOL);                       \
794     char *buffer_ = (BUF);                                      \
795     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
796       {                                                         \
797           sprintf (buffer_, "\"%s\"", symbol_);                 \
798       }                                                         \
799     else                                                        \
800       {                                                         \
801         strcpy (buffer_, symbol_);                              \
802       }                                                         \
803   } while (0)
804
805 /* Given a symbol name string, create the lazy pointer version
806    of the symbol name.  */
807
808 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
809   do {                                                          \
810     const char *symbol_ = (SYMBOL);                             \
811     char *buffer_ = (BUF);                                      \
812     if (symbol_[0] == '"')                                      \
813       {                                                         \
814         strcpy (buffer_, "\"L");                                \
815         strcpy (buffer_ + 2, symbol_ + 1);                      \
816         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
817       }                                                         \
818     else if (name_needs_quotes (symbol_))                       \
819       {                                                         \
820         strcpy (buffer_, "\"L");                                \
821         strcpy (buffer_ + 2, symbol_);                          \
822         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
823       }                                                         \
824     else                                                        \
825       {                                                         \
826         strcpy (buffer_, "L");                                  \
827         strcpy (buffer_ + 1, symbol_);                          \
828         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
829       }                                                         \
830   } while (0)
831
832 #define EH_FRAME_SECTION_NAME   "__TEXT"
833 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
834
835 /* Java runtime class list.  */
836 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
837
838 #undef ASM_PREFERRED_EH_DATA_FORMAT
839 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
840   (((CODE) == 2 && (GLOBAL) == 1) \
841    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
842      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
843
844 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
845   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
846
847 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
848   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
849
850 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
851       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
852         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
853         goto DONE;                                                                      \
854       }
855
856 /* Experimentally, putting jump tables in text is faster on SPEC.
857    Also this is needed for correctness for coalesced functions.  */
858
859 #ifndef JUMP_TABLES_IN_TEXT_SECTION
860 #define JUMP_TABLES_IN_TEXT_SECTION 1
861 #endif
862
863 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
864
865 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
866 #undef TARGET_ASM_NAMED_SECTION
867 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
868
869 /* Handle pragma weak and pragma pack.  */
870 #define HANDLE_SYSV_PRAGMA 1
871
872 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
873
874 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
875   do {                                                          \
876     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
877     c_register_pragma (0, "options", darwin_pragma_options);    \
878     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
879     c_register_pragma (0, "unused", darwin_pragma_unused);      \
880     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
881   } while (0)
882
883 #undef ASM_APP_ON
884 #define ASM_APP_ON ""
885 #undef ASM_APP_OFF
886 #define ASM_APP_OFF ""
887
888 void darwin_register_frameworks (const char *, const char *, int);
889 void darwin_register_objc_includes (const char *, const char *, int);
890 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
891 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
892
893 void add_framework_path (char *);
894 #define TARGET_OPTF add_framework_path
895
896 #define TARGET_POSIX_IO
897
898 /* All new versions of Darwin have C99 functions.  */
899
900 #define TARGET_C99_FUNCTIONS 1
901
902 #define WINT_TYPE "int"
903
904 /* Every program on darwin links against libSystem which contains the pthread
905    routines, so there's no need to explicitly call out when doing threaded
906    work.  */
907
908 #undef GOMP_SELF_SPECS
909 #define GOMP_SELF_SPECS ""
910
911 /* Darwin can't support anchors until we can cope with the adjustments
912    to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
913    when outputting members of an anchor block and the linker can be
914    taught to keep them together or we find some other suitable
915    code-gen technique.  */
916
917 #if 0
918 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
919 #else
920 #define TARGET_ASM_OUTPUT_ANCHOR NULL
921 #endif
922
923 /* Attempt to turn on execute permission for the stack.  This may be
924     used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
925     if the target machine can change execute permissions on a page).
926
927     There is no way to query the execute permission of the stack, so
928     we always issue the mprotect() call.
929
930     Unfortunately it is not possible to make this namespace-clean.
931
932     Also note that no errors should be emitted by this code; it is
933     considered dangerous for library calls to send messages to
934     stdout/stderr.  */
935
936 #define ENABLE_EXECUTE_STACK                                            \
937 extern void __enable_execute_stack (void *);                            \
938 void                                                                    \
939 __enable_execute_stack (void *addr)                                     \
940 {                                                                       \
941    extern int mprotect (void *, size_t, int);                           \
942    extern int getpagesize (void);                                       \
943    static int size;                                                     \
944    static long mask;                                                    \
945                                                                         \
946    char *page, *end;                                                    \
947                                                                         \
948    if (size == 0)                                                       \
949      {                                                                  \
950        size = getpagesize();                                            \
951        mask = ~((long) size - 1);                                       \
952      }                                                                  \
953                                                                         \
954    page = (char *) (((long) addr) & mask);                              \
955    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
956                                                                         \
957    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
958    (void) mprotect (page, end - page, 7);                               \
959 }
960
961 /* For Apple KEXTs, we make the constructors return this to match gcc
962    2.95.  */
963 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
964 extern int flag_mkernel;
965 extern int flag_apple_kext;
966 #define TARGET_KEXTABI flag_apple_kext
967
968 #endif /* CONFIG_DARWIN_H */