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[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, 2006
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     %(linker) %l %X %{d} %{s} %{t} %{Z} \
234     %{A} %{e*} %{m} %{r} %{x} \
235     %{o*}%{!o:-o a.out} \
236     %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
237     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
238     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
239     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
240     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
241 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
242     %{.c|.cc|.C|.cpp|.c++|.CPP|.m|.mm: \
243     %{gdwarf-2:%{!gstabs*:%{!gnone: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
244
245 #ifdef TARGET_SYSTEM_ROOT
246 #define LINK_SYSROOT_SPEC \
247   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
248 #else
249 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
250 #endif
251
252 /* Please keep the random linker options in alphabetical order (modulo
253    'Z' and 'no' prefixes). Note that options taking arguments may appear
254    multiple times on a command line with different arguments each time,
255    so put a * after their names so all of them get passed.  */
256 #define LINK_SPEC  \
257   "%{static}%{!static:-dynamic} \
258    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
259    %{!Zdynamiclib: \
260      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
261      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
262      %{Zbundle:-bundle} \
263      %{Zbundle_loader*:-bundle_loader %*} \
264      %{client_name*} \
265      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
266 } \
267      %{current_version*:%e-current_version only allowed with -dynamiclib} \
268      %{Zforce_flat_namespace:-force_flat_namespace} \
269      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
270      %{keep_private_externs} \
271      %{private_bundle} \
272     } \
273    %{Zdynamiclib: -dylib \
274      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
275      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
276      %{client_name*:%e-client_name not allowed with -dynamiclib} \
277      %{compatibility_version*:-dylib_compatibility_version %*} \
278      %{current_version*:-dylib_current_version %*} \
279      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
280      %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
281      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
282      %{Zinstall_name*:-dylib_install_name %*} \
283      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
284      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
285     } \
286    %{Zall_load:-all_load} \
287    %{Zallowable_client*:-allowable_client %*} \
288    %{Zbind_at_load:-bind_at_load} \
289    %{Zarch_errors_fatal:-arch_errors_fatal} \
290    %{Zdead_strip:-dead_strip} \
291    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
292    %{Zdylib_file*:-dylib_file %*} \
293    %{Zdynamic:-dynamic}\
294    %{Zexported_symbols_list*:-exported_symbols_list %*} \
295    %{Zflat_namespace:-flat_namespace} \
296    %{headerpad_max_install_names*} \
297    %{Zimage_base*:-image_base %*} \
298    %{Zinit*:-init %*} \
299    %{mmacosx-version-min=*:-macosx_version_min %*} \
300    %{!mmacosx-version-min=*:%{shared-libgcc:-macosx_version_min 10.3}} \
301    %{nomultidefs} \
302    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
303    %{Zmultiply_defined*:-multiply_defined %*} \
304    %{!Zmultiply_defined*:%{shared-libgcc: \
305      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
306      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
307    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
308    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
309    %{read_only_relocs} \
310    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
311    %{Zsegaddr*:-segaddr %*} \
312    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
313    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
314    %{Zseg_addr_table*: -seg_addr_table %*} \
315    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
316    %{sub_library*} %{sub_umbrella*} \
317    " LINK_SYSROOT_SPEC " \
318    %{twolevel_namespace} %{twolevel_namespace_hints} \
319    %{umbrella*} \
320    %{undefined*} \
321    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
322    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
323    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
324    %{X} \
325    %{y*} \
326    %{w} \
327    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
328    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
329    %{whatsloaded} %{dylinker_install_name*} \
330    %{dylinker} %{Mach} "
331
332
333 /* Machine dependent libraries.  */
334
335 #define LIB_SPEC "%{!static:-lSystem}"
336
337 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
338    libraries to link against, and by not linking against libgcc_s on
339    earlier-than-10.3.9.
340
341    Note that by default, -lgcc_eh is not linked against!  This is
342    because in a future version of Darwin the EH frame information may
343    be in a new format, or the fallback routine might be changed; if
344    you want to explicitly link against the static version of those
345    routines, because you know you don't need to unwind through system
346    libraries, you need to explicitly say -static-libgcc.
347
348    If it is linked against, it has to be before -lgcc, because it may
349    need symbols from -lgcc.  */
350 #undef REAL_LIBGCC_SPEC
351 #define REAL_LIBGCC_SPEC                                                   \
352    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
353       shared-libgcc|fexceptions:                                           \
354        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
355        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
356        -lgcc;                                                              \
357       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
358        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
359        -lgcc}"
360
361 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
362
363    crt3.o provides __cxa_atexit on systems that don't have it.  Since
364    it's only used with C++, which requires passing -shared-libgcc, key
365    off that to avoid unnecessarily adding a destructor to every
366    powerpc program built.  */
367
368 #undef  STARTFILE_SPEC
369 #define STARTFILE_SPEC                                                      \
370   "%{Zdynamiclib: -ldylib1.o}                                               \
371    %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
372      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
373                      %{!static:%{object:-lgcrt0.o}                          \
374                                %{!object:%{preload:-lgcrt0.o}               \
375                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
376                 %{!pg:%{static:-lcrt0.o}                                    \
377                       %{!static:%{object:-lcrt0.o}                          \
378                                 %{!object:%{preload:-lcrt0.o}               \
379                                   %{!preload:-lcrt1.o %(darwin_crt2)}}}}}}  \
380   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
381
382 /* The native Darwin linker doesn't necessarily place files in the order
383    that they're specified on the link line.  Thus, it is pointless
384    to put anything in ENDFILE_SPEC.  */
385 /* #define ENDFILE_SPEC "" */
386
387 /* Default Darwin ASM_SPEC, very simple.  */
388 #define ASM_SPEC "-arch %(darwin_arch) \
389   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
390
391 /* We still allow output of STABS.  */
392
393 #define DBX_DEBUGGING_INFO 1
394
395 #define DWARF2_DEBUGGING_INFO
396 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
397
398 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
399 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
400 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
401 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
402 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
403 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
404 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
405 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
406 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
407 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
408 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
409
410 /* When generating stabs debugging, use N_BINCL entries.  */
411
412 #define DBX_USE_BINCL
413
414 /* There is no limit to the length of stabs strings.  */
415
416 #define DBX_CONTIN_LENGTH 0
417
418 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
419
420 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
421
422 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
423 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
424
425 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
426    sections.  machopic_select_section ensures that weak variables go in
427    coalesced sections.  Weak aliases (or any other kind of aliases) are
428    not supported.  Weak symbols that aren't visible outside the .s file
429    are not supported.  */
430 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
431   do {                                                                  \
432     if (ALIAS)                                                          \
433       {                                                                 \
434         warning (0, "alias definitions not supported in Mach-O; ignored");      \
435         break;                                                          \
436       }                                                                 \
437                                                                         \
438     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
439       targetm.asm_out.globalize_label (FILE, NAME);                     \
440     if (DECL_EXTERNAL (DECL))                                           \
441       fputs ("\t.weak_reference ", FILE);                               \
442     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
443         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
444       break;                                                            \
445     else if (TREE_PUBLIC (DECL))                                        \
446       fputs ("\t.weak_definition ", FILE);                              \
447     else                                                                \
448       break;                                                            \
449     assemble_name (FILE, NAME);                                         \
450     fputc ('\n', FILE);                                                 \
451   } while (0)
452
453 /* Darwin has the pthread routines in libSystem, which every program
454    links to, so there's no need for weak-ness for that.  */
455 #define GTHREAD_USE_WEAK 0
456
457 /* The Darwin linker imposes two limitations on common symbols: they
458    can't have hidden visibility, and they can't appear in dylibs.  As
459    a consequence, we should never use common symbols to represent
460    vague linkage. */
461 #undef USE_COMMON_FOR_ONE_ONLY
462 #define USE_COMMON_FOR_ONE_ONLY 0
463
464 /* The Darwin linker doesn't want coalesced symbols to appear in
465    a static archive's table of contents. */
466 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
467 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
468
469 /* On Darwin, we don't (at the time of writing) have linkonce sections
470    with names, so it's safe to make the class data not comdat.  */
471 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
472
473 /* We make exception information linkonce. */
474 #undef TARGET_USES_WEAK_UNWIND_INFO
475 #define TARGET_USES_WEAK_UNWIND_INFO 1
476
477 /* We need to use a nonlocal label for the start of an EH frame: the
478    Darwin linker requires that a coalesced section start with a label.
479    Unfortunately, it also requires that 'debug' sections don't contain
480    labels.  */
481 #undef FRAME_BEGIN_LABEL
482 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
483
484 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
485    emit a label for an empty FDE. */
486 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
487
488 /* Emit a label to separate the exception table.  */
489 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
490
491 /* Our profiling scheme doesn't LP labels and counter words.  */
492
493 #define NO_PROFILE_COUNTERS     1
494
495 #undef  INIT_SECTION_ASM_OP
496 #define INIT_SECTION_ASM_OP
497
498 #undef  INVOKE__main
499
500 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
501 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
502
503 /* Always prefix with an underscore.  */
504
505 #define USER_LABEL_PREFIX "_"
506
507 /* Don't output a .file directive.  That is only used by the assembler for
508    error reporting.  */
509 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
510 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
511
512 #undef  TARGET_ASM_FILE_END
513 #define TARGET_ASM_FILE_END darwin_file_end
514
515 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
516   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
517
518 /* Give ObjC methods pretty symbol names.  */
519
520 #undef  OBJC_GEN_METHOD_LABEL
521 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
522   do { if (CAT_NAME)                                                    \
523          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
524                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
525        else                                                             \
526          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
527                   (CLASS_NAME), (SEL_NAME));                            \
528      } while (0)
529
530 /* The RTTI data (e.g., __ti4name) is common and public (and static),
531    but it does need to be referenced via indirect PIC data pointers.
532    The machopic_define_symbol calls are telling the machopic subsystem
533    that the name *is* defined in this module, so it doesn't need to
534    make them indirect.  */
535
536 #undef ASM_DECLARE_OBJECT_NAME
537 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
538   do {                                                                  \
539     const char *xname = NAME;                                           \
540     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
541       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
542     if (! DECL_WEAK (DECL)                                              \
543         && ((TREE_STATIC (DECL)                                         \
544              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
545             || DECL_INITIAL (DECL)))                                    \
546         machopic_define_symbol (DECL_RTL (DECL));                       \
547     if ((TREE_STATIC (DECL)                                             \
548          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
549         || DECL_INITIAL (DECL))                                         \
550       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
551     ASM_OUTPUT_LABEL (FILE, xname);                                     \
552     /* Darwin doesn't support zero-size objects, so give them a         \
553        byte.  */                                                        \
554     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
555       assemble_zeros (1);                                               \
556   } while (0)
557
558 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
559   do {                                                                  \
560     const char *xname = NAME;                                           \
561     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
562       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
563     if (! DECL_WEAK (DECL)                                              \
564         && ((TREE_STATIC (DECL)                                         \
565              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
566             || DECL_INITIAL (DECL)))                                    \
567         machopic_define_symbol (DECL_RTL (DECL));                       \
568     if ((TREE_STATIC (DECL)                                             \
569          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
570         || DECL_INITIAL (DECL))                                         \
571       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
572     ASM_OUTPUT_LABEL (FILE, xname);                                     \
573   } while (0)
574
575 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
576   do {                                                          \
577     ASM_OUTPUT_LABEL (FILE, NAME);                              \
578     /* Darwin doesn't support zero-size objects, so give them a \
579        byte.  */                                                \
580     if ((SIZE) == 0)                                            \
581       assemble_zeros (1);                                       \
582   } while (0)
583
584 /* Wrap new method names in quotes so the assembler doesn't gag.
585    Make Objective-C internal symbols local.  */
586
587 #undef  ASM_OUTPUT_LABELREF
588 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
589   do {                                                                       \
590        const char *xname = (NAME);                                           \
591        if (! strcmp (xname, "<pic base>"))                                   \
592          machopic_output_function_base_name(FILE);                           \
593        else if (xname[0] == '&' || xname[0] == '*')                          \
594          {                                                                   \
595            int len = strlen (xname);                                         \
596            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
597              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
598            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
599              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
600            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
601              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
602            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
603              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
604            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
605              fprintf (FILE, "\"%s\"", &xname[1]);                            \
606            else                                                              \
607              fputs (&xname[1], FILE);                                        \
608          }                                                                   \
609        else if (xname[0] == '+' || xname[0] == '-')                          \
610          fprintf (FILE, "\"%s\"", xname);                                    \
611        else if (!strncmp (xname, "_OBJC_", 6))                               \
612          fprintf (FILE, "L%s", xname);                                       \
613        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
614          fprintf (FILE, "%s", xname);                                        \
615        else if (xname[0] != '"' && name_needs_quotes (xname))                \
616          fprintf (FILE, "\"%s\"", xname);                                    \
617        else                                                                  \
618          asm_fprintf (FILE, "%U%s", xname);                                  \
619   } while (0)
620
621 /* Output before executable code.  */
622 #undef TEXT_SECTION_ASM_OP
623 #define TEXT_SECTION_ASM_OP "\t.text"
624
625 /* Output before writable data.  */
626
627 #undef DATA_SECTION_ASM_OP
628 #define DATA_SECTION_ASM_OP "\t.data"
629
630 #undef  ALIGN_ASM_OP
631 #define ALIGN_ASM_OP            ".align"
632
633 #undef  ASM_OUTPUT_ALIGN
634 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
635   if ((LOG) != 0)                       \
636     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
637
638 /* Ensure correct alignment of bss data.  */
639
640 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
641 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
642   do {                                                                  \
643     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
644     fputs (".lcomm ", (FILE));                                          \
645     assemble_name ((FILE), (NAME));                                     \
646     if (_new_size == 0) _new_size = 1;                                  \
647     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
648              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
649     if ((DECL) && ((TREE_STATIC (DECL)                                  \
650          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
651         || DECL_INITIAL (DECL)))                                        \
652       {                                                                 \
653         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
654         machopic_define_symbol (DECL_RTL (DECL));                       \
655       }                                                                 \
656   } while (0)
657
658 /* The maximum alignment which the object file format can support.
659    For Mach-O, this is 2^15.  */
660
661 #undef  MAX_OFILE_ALIGNMENT
662 #define MAX_OFILE_ALIGNMENT 0x8000
663
664 /* Declare the section variables.  */
665 #ifndef USED_FOR_TARGET
666 enum darwin_section_enum {
667 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
668 #include "darwin-sections.def"
669 #undef DEF_SECTION
670   NUM_DARWIN_SECTIONS
671 };
672 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
673 #endif
674
675 #undef  TARGET_ASM_SELECT_SECTION
676 #define TARGET_ASM_SELECT_SECTION machopic_select_section
677 #define USE_SELECT_SECTION_FOR_FUNCTIONS
678
679 #undef  TARGET_ASM_SELECT_RTX_SECTION
680 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
681 #undef  TARGET_ASM_UNIQUE_SECTION
682 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
683 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
684 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
685
686
687 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
688     do {                                                                \
689          if (FILE) {                                                    \
690            if (MACHOPIC_INDIRECT)                                       \
691              fprintf (FILE, "\t.lazy_reference ");                      \
692            else                                                         \
693              fprintf (FILE, "\t.reference ");                           \
694            assemble_name (FILE, NAME);                                  \
695            fprintf (FILE, "\n");                                        \
696          }                                                              \
697        } while (0)
698
699 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
700     do {                                                                \
701          if (FILE) {                                                    \
702            fprintf (FILE, "\t");                                        \
703            assemble_name (FILE, NAME);                                  \
704            fprintf (FILE, "=0\n");                                      \
705            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
706          }                                                              \
707        } while (0)
708
709 /* Globalizing directive for a label.  */
710 #define GLOBAL_ASM_OP ".globl "
711 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
712
713 /* Emit an assembler directive to set visibility for a symbol.  Used
714    to support visibility attribute and Darwin's private extern
715    feature.  */
716 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
717 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
718
719 /* Extra attributes for Darwin.  */
720 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
721   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
722   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
723     darwin_handle_kext_attribute },                                          \
724   { "weak_import", 0, 0, true, false, false,                                 \
725     darwin_handle_weak_import_attribute }
726
727 #undef ASM_GENERATE_INTERNAL_LABEL
728 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
729   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
730
731 #undef TARGET_ASM_MARK_DECL_PRESERVED
732 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
733
734 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
735    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
736    variable has been defined in this translation unit.
737    When porting Mach-O to new architectures you need to make
738    sure these aren't clobbered by the backend.  */
739
740 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
741 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
742
743 /* Set on a symbol to indicate when fix-and-continue style code
744    generation is being used and the symbol refers to a static symbol
745    that should be rebound from new instances of a translation unit to
746    the original instance of the data.  */
747
748 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
749
750 /* Symbolic names for various things we might know about a symbol.  */
751
752 enum machopic_addr_class {
753   MACHOPIC_UNDEFINED,
754   MACHOPIC_DEFINED_DATA,
755   MACHOPIC_UNDEFINED_DATA,
756   MACHOPIC_DEFINED_FUNCTION,
757   MACHOPIC_UNDEFINED_FUNCTION
758 };
759
760 /* Macros defining the various PIC cases.  */
761
762 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
763 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
764 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
765 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
766
767 #undef TARGET_ENCODE_SECTION_INFO
768 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
769 #undef TARGET_STRIP_NAME_ENCODING
770 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
771
772 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
773   do {                                                          \
774     const char *const stub_ = (STUB);                           \
775     char *buffer_ = (BUF);                                      \
776     strcpy (buffer_, stub_);                                    \
777     if (stub_[0] == '"')                                        \
778       {                                                         \
779         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
780       }                                                         \
781     else                                                        \
782       {                                                         \
783         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
784       }                                                         \
785   } while (0)
786
787 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
788   do {                                                          \
789     const char *const symbol_ = (SYMBOL);                       \
790     char *buffer_ = (BUF);                                      \
791     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
792       {                                                         \
793           sprintf (buffer_, "\"%s\"", symbol_);                 \
794       }                                                         \
795     else                                                        \
796       {                                                         \
797         strcpy (buffer_, symbol_);                              \
798       }                                                         \
799   } while (0)
800
801 /* Given a symbol name string, create the lazy pointer version
802    of the symbol name.  */
803
804 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
805   do {                                                          \
806     const char *symbol_ = (SYMBOL);                             \
807     char *buffer_ = (BUF);                                      \
808     if (symbol_[0] == '"')                                      \
809       {                                                         \
810         strcpy (buffer_, "\"L");                                \
811         strcpy (buffer_ + 2, symbol_ + 1);                      \
812         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
813       }                                                         \
814     else if (name_needs_quotes (symbol_))                       \
815       {                                                         \
816         strcpy (buffer_, "\"L");                                \
817         strcpy (buffer_ + 2, symbol_);                          \
818         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
819       }                                                         \
820     else                                                        \
821       {                                                         \
822         strcpy (buffer_, "L");                                  \
823         strcpy (buffer_ + 1, symbol_);                          \
824         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
825       }                                                         \
826   } while (0)
827
828 #define EH_FRAME_SECTION_NAME   "__TEXT"
829 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
830
831 /* Java runtime class list.  */
832 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
833
834 #undef ASM_PREFERRED_EH_DATA_FORMAT
835 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
836   (((CODE) == 2 && (GLOBAL) == 1) \
837    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
838      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
839
840 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
841   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
842
843 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
844   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
845
846 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
847       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
848         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
849         goto DONE;                                                                      \
850       }
851
852 /* Experimentally, putting jump tables in text is faster on SPEC.
853    Also this is needed for correctness for coalesced functions.  */
854
855 #ifndef JUMP_TABLES_IN_TEXT_SECTION
856 #define JUMP_TABLES_IN_TEXT_SECTION 1
857 #endif
858
859 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
860
861 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
862 #undef TARGET_ASM_NAMED_SECTION
863 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
864
865 /* Handle pragma weak and pragma pack.  */
866 #define HANDLE_SYSV_PRAGMA 1
867
868 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
869
870 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
871   do {                                                          \
872     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
873     c_register_pragma (0, "options", darwin_pragma_options);    \
874     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
875     c_register_pragma (0, "unused", darwin_pragma_unused);      \
876     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
877   } while (0)
878
879 #undef ASM_APP_ON
880 #define ASM_APP_ON ""
881 #undef ASM_APP_OFF
882 #define ASM_APP_OFF ""
883
884 void darwin_register_frameworks (const char *, const char *, int);
885 void darwin_register_objc_includes (const char *, const char *, int);
886 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
887 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
888
889 void add_framework_path (char *);
890 #define TARGET_OPTF add_framework_path
891
892 #define TARGET_POSIX_IO
893
894 /* All new versions of Darwin have C99 functions.  */
895
896 #define TARGET_C99_FUNCTIONS 1
897
898 #define WINT_TYPE "int"
899
900 /* Every program on darwin links against libSystem which contains the pthread
901    routines, so there's no need to explicitly call out when doing threaded
902    work.  */
903
904 #undef GOMP_SELF_SPECS
905 #define GOMP_SELF_SPECS ""
906
907 /* Darwin can't support anchors until we can cope with the adjustments
908    to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
909    when outputting members of an anchor block and the linker can be
910    taught to keep them together or we find some other suitable
911    code-gen technique.  */
912
913 #if 0
914 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
915 #else
916 #define TARGET_ASM_OUTPUT_ANCHOR NULL
917 #endif
918
919 /* Attempt to turn on execute permission for the stack.  This may be
920     used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
921     if the target machine can change execute permissions on a page).
922
923     There is no way to query the execute permission of the stack, so
924     we always issue the mprotect() call.
925
926     Unfortunately it is not possible to make this namespace-clean.
927
928     Also note that no errors should be emitted by this code; it is
929     considered dangerous for library calls to send messages to
930     stdout/stderr.  */
931
932 #define ENABLE_EXECUTE_STACK                                            \
933 extern void __enable_execute_stack (void *);                            \
934 void                                                                    \
935 __enable_execute_stack (void *addr)                                     \
936 {                                                                       \
937    extern int mprotect (void *, size_t, int);                           \
938    extern int getpagesize (void);                                       \
939    static int size;                                                     \
940    static long mask;                                                    \
941                                                                         \
942    char *page, *end;                                                    \
943                                                                         \
944    if (size == 0)                                                       \
945      {                                                                  \
946        size = getpagesize();                                            \
947        mask = ~((long) size - 1);                                       \
948      }                                                                  \
949                                                                         \
950    page = (char *) (((long) addr) & mask);                              \
951    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
952                                                                         \
953    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
954    (void) mprotect (page, end - page, 7);                               \
955 }
956
957 /* For Apple KEXTs, we make the constructors return this to match gcc
958    2.95.  */
959 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
960 extern int flag_mkernel;
961 extern int flag_apple_kext;
962 #define TARGET_KEXTABI flag_apple_kext
963
964 #endif /* CONFIG_DARWIN_H */