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gcconfig.h

Last change on this file was 132, checked in by cinc, 19 years ago
Boehm-Demers-Weiser garbage collector. Single-threaded for OS/2.
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1	/*
2	* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
3	* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
4	* Copyright (c) 1996 by Silicon Graphics. All rights reserved.
5	* Copyright (c) 2000-2004 Hewlett-Packard Development Company, L.P.
6	*
7	* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
8	* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
9	*
10	* Permission is hereby granted to use or copy this program
11	* for any purpose, provided the above notices are retained on all copies.
12	* Permission to modify the code and to distribute modified code is granted,
13	* provided the above notices are retained, and a notice that the code was
14	* modified is included with the above copyright notice.
15	*/
16
17	/*
18	* This header is private to the gc. It is almost always included from
19	* gc_priv.h. However it is possible to include it by itself if just the
20	* configuration macros are needed. In that
21	* case, a few declarations relying on types declared in gc_priv.h will be
22	* omitted.
23	*/
24
25	#ifndef GCCONFIG_H
26
27	# define GCCONFIG_H
28
29	# ifndef GC_PRIVATE_H
30	/* Fake ptr_t declaration, just to avoid compilation errors. */
31	/* This avoids many instances if "ifndef GC_PRIVATE_H" below. */
32	typedef struct GC_undefined_struct * ptr_t;
33	# endif
34
35	/* Machine dependent parameters. Some tuning parameters can be found */
36	/* near the top of gc_private.h. */
37
38	/* Machine specific parts contributed by various people. See README file. */
39
40	/* First a unified test for Linux: */
41	# if defined(linux) \|\| defined(__linux__)
42	# ifndef LINUX
43	# define LINUX
44	# endif
45	# endif
46
47	/* And one for NetBSD: */
48	# if defined(__NetBSD__)
49	# define NETBSD
50	# endif
51
52	/* And one for OpenBSD: */
53	# if defined(__OpenBSD__)
54	# define OPENBSD
55	# endif
56
57	/* And one for FreeBSD: */
58	# if (defined(__FreeBSD__) \|\| defined(__DragonFly__) \|\| \
59	defined(__FreeBSD_kernel__)) && !defined(FREEBSD)
60	# define FREEBSD
61	# endif
62
63	/* Determine the machine type: */
64	# if defined(__arm__) \|\| defined(__thumb__)
65	# define ARM32
66	# if !defined(LINUX) && !defined(NETBSD)
67	# define NOSYS
68	# define mach_type_known
69	# endif
70	# endif
71	# if defined(sun) && defined(mc68000)
72	# define M68K
73	# define SUNOS4
74	# define mach_type_known
75	# endif
76	# if defined(hp9000s300)
77	# define M68K
78	# define HP
79	# define mach_type_known
80	# endif
81	# if defined(OPENBSD) && defined(m68k)
82	# define M68K
83	# define mach_type_known
84	# endif
85	# if defined(OPENBSD) && defined(__sparc__)
86	# define SPARC
87	# define mach_type_known
88	# endif
89	# if defined(NETBSD) && (defined(m68k) \|\| defined(__m68k__))
90	# define M68K
91	# define mach_type_known
92	# endif
93	# if defined(NETBSD) && defined(__powerpc__)
94	# define POWERPC
95	# define mach_type_known
96	# endif
97	# if defined(NETBSD) && (defined(__arm32__) \|\| defined(__arm__))
98	# define ARM32
99	# define mach_type_known
100	# endif
101	# if defined(NETBSD) && defined(__sh__)
102	# define SH
103	# define mach_type_known
104	# endif
105	# if defined(vax)
106	# define VAX
107	# ifdef ultrix
108	# define ULTRIX
109	# else
110	# define BSD
111	# endif
112	# define mach_type_known
113	# endif
114	# if defined(__NetBSD__) && defined(__vax__)
115	# define VAX
116	# define mach_type_known
117	# endif
118	# if defined(mips) \|\| defined(__mips) \|\| defined(_mips)
119	# define MIPS
120	# if defined(nec_ews) \|\| defined(_nec_ews)
121	# define EWS4800
122	# endif
123	# if !defined(LINUX) && !defined(EWS4800) && !defined(NETBSD)
124	# if defined(ultrix) \|\| defined(__ultrix)
125	# define ULTRIX
126	# else
127	# if defined(_SYSTYPE_SVR4) \|\| defined(SYSTYPE_SVR4) \
128	\|\| defined(__SYSTYPE_SVR4__)
129	# define IRIX5 /* or IRIX 6.X */
130	# else
131	# define RISCOS /* or IRIX 4.X */
132	# endif
133	# endif
134	# endif /* !LINUX */
135	# if defined(__NetBSD__) && defined(__MIPSEL__)
136	# undef ULTRIX
137	# endif
138	# define mach_type_known
139	# endif
140	# if defined(DGUX) && (defined(i386) \|\| defined(__i386__))
141	# define I386
142	# ifndef _USING_DGUX
143	# define _USING_DGUX
144	# endif
145	# define mach_type_known
146	# endif
147	# if defined(sequent) && (defined(i386) \|\| defined(__i386__))
148	# define I386
149	# define SEQUENT
150	# define mach_type_known
151	# endif
152	# if defined(sun) && (defined(i386) \|\| defined(__i386__))
153	# define I386
154	# define SUNOS5
155	# define mach_type_known
156	# endif
157	# if defined(sun) && defined(__amd64)
158	# define X86_64
159	# define SOLARIS
160	# define mach_type_known
161	# endif
162	# if (defined(__OS2__) \|\| defined(__EMX__)) && defined(__32BIT__)
163	# define I386
164	# define OS2
165	# define mach_type_known
166	# endif
167	# if defined(ibm032)
168	# define RT
169	# define mach_type_known
170	# endif
171	# if defined(sun) && (defined(sparc) \|\| defined(__sparc))
172	# define SPARC
173	/* Test for SunOS 5.x */
174	# include <errno.h>
175	# ifdef ECHRNG
176	# define SUNOS5
177	# else
178	# define SUNOS4
179	# endif
180	# define mach_type_known
181	# endif
182	# if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
183	&& !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__FreeBSD__) \
184	&& !defined(__DragonFly__)
185	# define SPARC
186	# define DRSNX
187	# define mach_type_known
188	# endif
189	# if defined(_IBMR2)
190	# define RS6000
191	# define mach_type_known
192	# endif
193	# if defined(__NetBSD__) && defined(__sparc__)
194	# define SPARC
195	# define mach_type_known
196	# endif
197	# if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
198	/* The above test may need refinement */
199	# define I386
200	# if defined(_SCO_ELF)
201	# define SCO_ELF
202	# else
203	# define SCO
204	# endif
205	# define mach_type_known
206	# endif
207	# if defined(_AUX_SOURCE)
208	# define M68K
209	# define SYSV
210	# define mach_type_known
211	# endif
212	# if defined(_PA_RISC1_0) \|\| defined(_PA_RISC1_1) \|\| defined(_PA_RISC2_0) \
213	\|\| defined(hppa) \|\| defined(__hppa__)
214	# define HP_PA
215	# if !defined(LINUX) && !defined(HPUX)
216	# define HPUX
217	# endif
218	# define mach_type_known
219	# endif
220	# if defined(__ia64) && defined(_HPUX_SOURCE)
221	# define IA64
222	# ifndef HPUX
223	# define HPUX
224	# endif
225	# define mach_type_known
226	# endif
227	# if defined(__BEOS__) && defined(_X86_)
228	# define I386
229	# define BEOS
230	# define mach_type_known
231	# endif
232	# if defined(LINUX) && (defined(i386) \|\| defined(__i386__))
233	# define I386
234	# define mach_type_known
235	# endif
236	# if defined(LINUX) && defined(__x86_64__)
237	# define X86_64
238	# define mach_type_known
239	# endif
240	# if defined(LINUX) && (defined(__ia64__) \|\| defined(__ia64))
241	# define IA64
242	# define mach_type_known
243	# endif
244	# if defined(LINUX) && defined(__arm__)
245	# define ARM32
246	# define mach_type_known
247	# endif
248	# if defined(LINUX) && defined(__cris__)
249	# ifndef CRIS
250	# define CRIS
251	# endif
252	# define mach_type_known
253	# endif
254	# if defined(LINUX) && (defined(powerpc) \|\| defined(__powerpc__) \|\| \
255	defined(powerpc64) \|\| defined(__powerpc64__))
256	# define POWERPC
257	# define mach_type_known
258	# endif
259	# if defined(FREEBSD) && (defined(powerpc) \|\| defined(__powerpc__))
260	# define POWERPC
261	# define mach_type_known
262	# endif
263	# if defined(LINUX) && defined(__mc68000__)
264	# define M68K
265	# define mach_type_known
266	# endif
267	# if defined(LINUX) && (defined(sparc) \|\| defined(__sparc__))
268	# define SPARC
269	# define mach_type_known
270	# endif
271	# if defined(LINUX) && defined(__arm__)
272	# define ARM32
273	# define mach_type_known
274	# endif
275	# if defined(LINUX) && defined(__sh__)
276	# define SH
277	# define mach_type_known
278	# endif
279	# if defined(LINUX) && defined(__m32r__)
280	# define M32R
281	# define mach_type_known
282	# endif
283	# if defined(__alpha) \|\| defined(__alpha__)
284	# define ALPHA
285	# if !defined(LINUX) && !defined(NETBSD) && !defined(OPENBSD) && !defined(FREEBSD)
286	# define OSF1 /* a.k.a Digital Unix */
287	# endif
288	# define mach_type_known
289	# endif
290	# if defined(_AMIGA) && !defined(AMIGA)
291	# define AMIGA
292	# endif
293	# ifdef AMIGA
294	# define M68K
295	# define mach_type_known
296	# endif
297	# if defined(THINK_C) \|\| defined(__MWERKS__) && !defined(__powerc)
298	# define M68K
299	# define MACOS
300	# define mach_type_known
301	# endif
302	# if defined(__MWERKS__) && defined(__powerc) && !defined(__MACH__)
303	# define POWERPC
304	# define MACOS
305	# define mach_type_known
306	# endif
307	# if defined(macosx) \|\| (defined(__APPLE__) && defined(__MACH__))
308	# define DARWIN
309	# if defined(__ppc__) \|\| defined(__ppc64__)
310	# define POWERPC
311	# define mach_type_known
312	# endif
313	# if defined(__i386__)
314	# define I386
315	# define mach_type_known
316	# endif
317	# endif
318	# if defined(NeXT) && defined(mc68000)
319	# define M68K
320	# define NEXT
321	# define mach_type_known
322	# endif
323	# if defined(NeXT) && (defined(i386) \|\| defined(__i386__))
324	# define I386
325	# define NEXT
326	# define mach_type_known
327	# endif
328	# if defined(__OpenBSD__) && (defined(i386) \|\| defined(__i386__))
329	# define I386
330	# define OPENBSD
331	# define mach_type_known
332	# endif
333	# if defined(FREEBSD) && (defined(i386) \|\| defined(__i386__))
334	# define I386
335	# define mach_type_known
336	# endif
337	# if defined(__NetBSD__) && (defined(i386) \|\| defined(__i386__))
338	# define I386
339	# define mach_type_known
340	# endif
341	# if defined(__NetBSD__) && defined(__x86_64__)
342	# define X86_64
343	# define mach_type_known
344	# endif
345	# if defined(FREEBSD) && defined(__sparc__)
346	# define SPARC
347	# define mach_type_known
348	#endif
349	# if defined(bsdi) && (defined(i386) \|\| defined(__i386__))
350	# define I386
351	# define BSDI
352	# define mach_type_known
353	# endif
354	# if !defined(mach_type_known) && defined(__386BSD__)
355	# define I386
356	# define THREE86BSD
357	# define mach_type_known
358	# endif
359	# if defined(_CX_UX) && defined(_M88K)
360	# define M88K
361	# define CX_UX
362	# define mach_type_known
363	# endif
364	# if defined(DGUX) && defined(m88k)
365	# define M88K
366	/* DGUX defined */
367	# define mach_type_known
368	# endif
369	# if defined(_WIN32_WCE)
370	/* SH3, SH4, MIPS already defined for corresponding architectures */
371	# if defined(SH3) \|\| defined(SH4)
372	# define SH
373	# endif
374	# if defined(x86)
375	# define I386
376	# endif
377	# if defined(ARM)
378	# define ARM32
379	# endif
380	# define MSWINCE
381	# define mach_type_known
382	# else
383	# if (defined(_MSDOS) \|\| defined(_MSC_VER)) && (_M_IX86 >= 300) \
384	\|\| defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
385	# define I386
386	# define MSWIN32 /* or Win32s */
387	# define mach_type_known
388	# endif
389	# if defined(_MSC_VER) && defined(_M_IA64)
390	# define IA64
391	# define MSWIN32 /* Really win64, but we don't treat 64-bit */
392	/* variants as a differnt platform. */
393	# endif
394	# endif
395	# if defined(__DJGPP__)
396	# define I386
397	# ifndef DJGPP
398	# define DJGPP /* MSDOS running the DJGPP port of GCC */
399	# endif
400	# define mach_type_known
401	# endif
402	# if defined(__CYGWIN32__) \|\| defined(__CYGWIN__)
403	# define I386
404	# define CYGWIN32
405	# define mach_type_known
406	# endif
407	# if defined(__MINGW32__)
408	# define I386
409	# define MSWIN32
410	# define mach_type_known
411	# endif
412	# if defined(__BORLANDC__)
413	# define I386
414	# define MSWIN32
415	# define mach_type_known
416	# endif
417	# if defined(_UTS) && !defined(mach_type_known)
418	# define S370
419	# define UTS4
420	# define mach_type_known
421	# endif
422	# if defined(__pj__)
423	# define PJ
424	# define mach_type_known
425	# endif
426	# if defined(__embedded__) && defined(PPC)
427	# define POWERPC
428	# define NOSYS
429	# define mach_type_known
430	# endif
431	/* Ivan Demakov */
432	# if defined(__WATCOMC__) && defined(__386__)
433	# define I386
434	# if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
435	# if defined(__OS2__)
436	# define OS2
437	# else
438	# if defined(__WINDOWS_386__) \|\| defined(__NT__)
439	# define MSWIN32
440	# else
441	# define DOS4GW
442	# endif
443	# endif
444	# endif
445	# define mach_type_known
446	# endif
447	# if defined(__s390__) && defined(LINUX)
448	# define S390
449	# define mach_type_known
450	# endif
451	# if defined(__GNU__)
452	# if defined(__i386__)
453	/* The Debian Hurd running on generic PC */
454	# define HURD
455	# define I386
456	# define mach_type_known
457	# endif
458	# endif
459	# if defined(__TANDEM)
460	/* Nonstop S-series */
461	/* FIXME: Should recognize Integrity series? */
462	# define MIPS
463	# define NONSTOP
464	# define mach_type_known
465	# endif
466
467	/* Feel free to add more clauses here */
468
469	/* Or manually define the machine type here. A machine type is */
470	/* characterized by the architecture. Some */
471	/* machine types are further subdivided by OS. */
472	/* the macros ULTRIX, RISCOS, and BSD to distinguish. */
473	/* Note that SGI IRIX is treated identically to RISCOS. */
474	/* SYSV on an M68K actually means A/UX. */
475	/* The distinction in these cases is usually the stack starting address */
476	# ifndef mach_type_known
477	--> unknown machine type
478	# endif
479	/* Mapping is: M68K ==> Motorola 680X0 */
480	/* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
481	/* MACOS and AMIGA variants) */
482	/* I386 ==> Intel 386 */
483	/* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
484	/* FREEBSD, THREE86BSD, MSWIN32, */
485	/* BSDI,SUNOS5, NEXT, other variants) */
486	/* NS32K ==> Encore Multimax */
487	/* MIPS ==> R2000 through R14K */
488	/* (many variants) */
489	/* VAX ==> DEC VAX */
490	/* (BSD, ULTRIX variants) */
491	/* RS6000 ==> IBM RS/6000 AIX3.X */
492	/* RT ==> IBM PC/RT */
493	/* HP_PA ==> HP9000/700 & /800 */
494	/* HP/UX, LINUX */
495	/* SPARC ==> SPARC v7/v8/v9 */
496	/* (SUNOS4, SUNOS5, LINUX, */
497	/* DRSNX variants) */
498	/* ALPHA ==> DEC Alpha */
499	/* (OSF1 and LINUX variants) */
500	/* M88K ==> Motorola 88XX0 */
501	/* (CX_UX and DGUX) */
502	/* S370 ==> 370-like machine */
503	/* running Amdahl UTS4 */
504	/* S390 ==> 390-like machine */
505	/* running LINUX */
506	/* ARM32 ==> Intel StrongARM */
507	/* IA64 ==> Intel IPF */
508	/* (e.g. Itanium) */
509	/* (LINUX and HPUX) */
510	/* SH ==> Hitachi SuperH */
511	/* (LINUX & MSWINCE) */
512	/* X86_64 ==> AMD x86-64 */
513	/* POWERPC ==> IBM/Apple PowerPC */
514	/* (MACOS(<=9),DARWIN(incl.MACOSX),*/
515	/* LINUX, NETBSD, NOSYS variants) */
516	/* Handles 32 and 64-bit variants. */
517	/* AIX should be handled here, but */
518	/* that's called an RS6000. */
519	/* CRIS ==> Axis Etrax */
520	/* M32R ==> Renesas M32R */
521
522
523	/*
524	* For each architecture and OS, the following need to be defined:
525	*
526	* CPP_WORDSZ is a simple integer constant representing the word size.
527	* in bits. We assume byte addressibility, where a byte has 8 bits.
528	* We also assume CPP_WORDSZ is either 32 or 64.
529	* (We care about the length of pointers, not hardware
530	* bus widths. Thus a 64 bit processor with a C compiler that uses
531	* 32 bit pointers should use CPP_WORDSZ of 32, not 64. Default is 32.)
532	*
533	* MACH_TYPE is a string representation of the machine type.
534	* OS_TYPE is analogous for the OS.
535	*
536	* ALIGNMENT is the largest N, such that
537	* all pointer are guaranteed to be aligned on N byte boundaries.
538	* defining it to be 1 will always work, but perform poorly.
539	*
540	* DATASTART is the beginning of the data segment.
541	* On some platforms SEARCH_FOR_DATA_START is defined.
542	* SEARCH_FOR_DATASTART will cause GC_data_start to
543	* be set to an address determined by accessing data backwards from _end
544	* until an unmapped page is found. DATASTART will be defined to be
545	* GC_data_start.
546	* On UNIX-like systems, the collector will scan the area between DATASTART
547	* and DATAEND for root pointers.
548	*
549	* DATAEND, if not `end' where `end' is defined as ``extern int end[];''.
550	* RTH suggests gaining access to linker script synth'd values with
551	* this idiom instead of `&end' where `end' is defined as ``extern int end;'' .
552	* Otherwise, ``GCC will assume these are in .sdata/.sbss'' and it will, e.g.,
553	* cause failures on alpha--* with ``-msmall-data or -fpic'' or mips--
554	* without any special options.
555	*
556	* ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
557	* the pointer size.
558	*
559	* STACKBOTTOM is the cool end of the stack, which is usually the
560	* highest address in the stack.
561	* Under PCR or OS/2, we have other ways of finding thread stacks.
562	* For each machine, the following should:
563	* 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
564	* 2) define exactly one of
565	* STACKBOTTOM (should be defined to be an expression)
566	* LINUX_STACKBOTTOM
567	* HEURISTIC1
568	* HEURISTIC2
569	* If STACKBOTTOM is defined, then it's value will be used directly as the
570	* stack base. If LINUX_STACKBOTTOM is defined, then it will be determined
571	* with a method appropriate for most Linux systems. Currently we look
572	* first for __libc_stack_end, and if that fails read it from /proc.
573	* If either of the last two macros are defined, then STACKBOTTOM is computed
574	* during collector startup using one of the following two heuristics:
575	* HEURISTIC1: Take an address inside GC_init's frame, and round it up to
576	* the next multiple of STACK_GRAN.
577	* HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
578	* in small steps (decrement if STACK_GROWS_UP), and read the value
579	* at each location. Remember the value when the first
580	* Segmentation violation or Bus error is signalled. Round that
581	* to the nearest plausible page boundary, and use that instead
582	* of STACKBOTTOM.
583	*
584	* Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
585	* the value of environ is a pointer that can serve as STACKBOTTOM.
586	* I expect that HEURISTIC2 can be replaced by this approach, which
587	* interferes far less with debugging. However it has the disadvantage
588	* that it's confused by a putenv call before the collector is initialized.
589	* This could be dealt with by intercepting putenv ...
590	*
591	* If no expression for STACKBOTTOM can be found, and neither of the above
592	* heuristics are usable, the collector can still be used with all of the above
593	* undefined, provided one of the following is done:
594	* 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
595	* without reference to STACKBOTTOM. This is appropriate for use in
596	* conjunction with thread packages, since there will be multiple stacks.
597	* (Allocating thread stacks in the heap, and treating them as ordinary
598	* heap data objects is also possible as a last resort. However, this is
599	* likely to introduce significant amounts of excess storage retention
600	* unless the dead parts of the thread stacks are periodically cleared.)
601	* 2) Client code may set GC_stackbottom before calling any GC_ routines.
602	* If the author of the client code controls the main program, this is
603	* easily accomplished by introducing a new main program, setting
604	* GC_stackbottom to the address of a local variable, and then calling
605	* the original main program. The new main program would read something
606	* like:
607	*
608	* # include "gc_private.h"
609	*
610	* main(argc, argv, envp)
611	* int argc;
612	* char argv, envp;
613	* {
614	* int dummy;
615	*
616	* GC_stackbottom = (ptr_t)(&dummy);
617	* return(real_main(argc, argv, envp));
618	* }
619	*
620	*
621	* Each architecture may also define the style of virtual dirty bit
622	* implementation to be used:
623	* MPROTECT_VDB: Write protect the heap and catch faults.
624	* PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
625	*
626	* An architecture may define DYNAMIC_LOADING if dynamic_load.c
627	* defined GC_register_dynamic_libraries() for the architecture.
628	*
629	* An architecture may define PREFETCH(x) to preload the cache with *x.
630	* This defaults to a no-op.
631	*
632	* PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
633	*
634	* An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
635	* clear the two words at GC_malloc-aligned address x. By default,
636	* word stores of 0 are used instead.
637	*
638	* HEAP_START may be defined as the initial address hint for mmap-based
639	* allocation.
640	*/
641
642	/* If we are using a recent version of gcc, we can use __builtin_unwind_init()
643	* to push the relevant registers onto the stack. This generally makes
644	* USE_GENERIC_PUSH_REGS the preferred approach for marking from registers.
645	*/
646	# if defined(__GNUC__) && ((__GNUC__ >= 3) \|\| \
647	(__GNUC__ == 2 && __GNUC_MINOR__ >= 8)) \
648	&& !defined(__INTEL_COMPILER) \
649	&& !defined(__PATHCC__)
650	# define HAVE_BUILTIN_UNWIND_INIT
651	# endif
652
653	# define STACK_GRAN 0x1000000
654	# ifdef M68K
655	# define MACH_TYPE "M68K"
656	# define ALIGNMENT 2
657	# ifdef OPENBSD
658	# define OS_TYPE "OPENBSD"
659	# define HEURISTIC2
660	# ifdef __ELF__
661	# define DATASTART GC_data_start
662	# define DYNAMIC_LOADING
663	# else
664	extern char etext[];
665	# define DATASTART ((ptr_t)(etext))
666	# endif
667	# define USE_GENERIC_PUSH_REGS
668	# endif
669	# ifdef NETBSD
670	# define OS_TYPE "NETBSD"
671	# define HEURISTIC2
672	# ifdef __ELF__
673	# define DATASTART GC_data_start
674	# define DYNAMIC_LOADING
675	# else
676	extern char etext[];
677	# define DATASTART ((ptr_t)(etext))
678	# endif
679	# define USE_GENERIC_PUSH_REGS
680	# endif
681	# ifdef LINUX
682	# define OS_TYPE "LINUX"
683	# define STACKBOTTOM ((ptr_t)0xf0000000)
684	# define USE_GENERIC_PUSH_REGS
685	/* We never got around to the assembly version. */
686	/* # define MPROTECT_VDB - Reported to not work 9/17/01 */
687	# ifdef __ELF__
688	# define DYNAMIC_LOADING
689	# include <features.h>
690	# if defined(__GLIBC__)&& __GLIBC__>=2
691	# define SEARCH_FOR_DATA_START
692	# else /* !GLIBC2 */
693	extern char **__environ;
694	# define DATASTART ((ptr_t)(&__environ))
695	/* hideous kludge: __environ is the first */
696	/* word in crt0.o, and delimits the start */
697	/* of the data segment, no matter which */
698	/* ld options were passed through. */
699	/* We could use _etext instead, but that */
700	/* would include .rodata, which may */
701	/* contain large read-only data tables */
702	/* that we'd rather not scan. */
703	# endif /* !GLIBC2 */
704	extern int _end[];
705	# define DATAEND (_end)
706	# else
707	extern int etext[];
708	# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
709	# endif
710	# endif
711	# ifdef SUNOS4
712	# define OS_TYPE "SUNOS4"
713	extern char etext[];
714	# define DATASTART ((ptr_t)((((word) (etext)) + 0x1ffff) & ~0x1ffff))
715	# define HEURISTIC1 /* differs */
716	# define DYNAMIC_LOADING
717	# endif
718	# ifdef HP
719	# define OS_TYPE "HP"
720	extern char etext[];
721	# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
722	# define STACKBOTTOM ((ptr_t) 0xffeffffc)
723	/* empirically determined. seems to work. */
724	# include <unistd.h>
725	# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
726	# endif
727	# ifdef SYSV
728	# define OS_TYPE "SYSV"
729	extern etext[];
730	# define DATASTART ((ptr_t)((((word) (etext)) + 0x3fffff) \
731	& ~0x3fffff) \
732	+((word)etext & 0x1fff))
733	/* This only works for shared-text binaries with magic number 0413.
734	The other sorts of SysV binaries put the data at the end of the text,
735	in which case the default of etext would work. Unfortunately,
736	handling both would require having the magic-number available.
737	-- Parag
738	*/
739	# define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
740	/* The stack starts at the top of memory, but */
741	/* 0x0 cannot be used as setjump_test complains */
742	/* that the stack direction is incorrect. Two */
743	/* bytes down from 0x0 should be safe enough. */
744	/* --Parag */
745	# include <sys/mmu.h>
746	# define GETPAGESIZE() PAGESIZE /* Is this still right? */
747	# endif
748	# ifdef AMIGA
749	# define OS_TYPE "AMIGA"
750	/* STACKBOTTOM and DATASTART handled specially */
751	/* in os_dep.c */
752	# define DATAEND /* not needed */
753	# define GETPAGESIZE() 4096
754	# endif
755	# ifdef MACOS
756	# ifndef __LOWMEM__
757	# include <LowMem.h>
758	# endif
759	# define OS_TYPE "MACOS"
760	/* see os_dep.c for details of global data segments. */
761	# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
762	# define DATAEND /* not needed */
763	# define GETPAGESIZE() 4096
764	# endif
765	# ifdef NEXT
766	# define OS_TYPE "NEXT"
767	# define DATASTART ((ptr_t) get_etext())
768	# define STACKBOTTOM ((ptr_t) 0x4000000)
769	# define DATAEND /* not needed */
770	# endif
771	# endif
772
773	# if defined(POWERPC)
774	# define MACH_TYPE "POWERPC"
775	# ifdef MACOS
776	# define ALIGNMENT 2 /* Still necessary? Could it be 4? */
777	# ifndef __LOWMEM__
778	# include <LowMem.h>
779	# endif
780	# define OS_TYPE "MACOS"
781	/* see os_dep.c for details of global data segments. */
782	# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
783	# define DATAEND /* not needed */
784	# endif
785	# ifdef LINUX
786	# if defined(__powerpc64__)
787	# define ALIGNMENT 8
788	# define CPP_WORDSZ 64
789	# ifndef HBLKSIZE
790	# define HBLKSIZE 4096
791	# endif
792	# else
793	# define ALIGNMENT 4
794	# endif
795	# define OS_TYPE "LINUX"
796	/* HEURISTIC1 has been reliably reported to fail for a 32-bit */
797	/* executable on a 64 bit kernel. */
798	# define LINUX_STACKBOTTOM
799	# define DYNAMIC_LOADING
800	# define SEARCH_FOR_DATA_START
801	extern int _end[];
802	# define DATAEND (_end)
803	# endif
804	# ifdef DARWIN
805	# ifdef __ppc64__
806	# define ALIGNMENT 8
807	# define CPP_WORDSZ 64
808	# else
809	# define ALIGNMENT 4
810	# endif
811	# define OS_TYPE "DARWIN"
812	# define DYNAMIC_LOADING
813	/* XXX: see get_end(3), get_etext() and get_end() should not be used.
814	These aren't used when dyld support is enabled (it is by default) */
815	# define DATASTART ((ptr_t) get_etext())
816	# define DATAEND ((ptr_t) get_end())
817	# define STACKBOTTOM ((ptr_t) 0xc0000000)
818	# define USE_MMAP
819	# define USE_MMAP_ANON
820	# define USE_ASM_PUSH_REGS
821	/* This is potentially buggy. It needs more testing. See the comments in
822	os_dep.c. It relies on threads to track writes. */
823	# ifdef GC_DARWIN_THREADS
824	/* # define MPROTECT_VDB -- diabled for now. May work for some apps. */
825	# endif
826	# include <unistd.h>
827	# define GETPAGESIZE() getpagesize()
828	# if defined(USE_PPC_PREFETCH) && defined(__GNUC__)
829	/* The performance impact of prefetches is untested */
830	# define PREFETCH(x) \
831	__asm__ __volatile__ ("dcbt 0,%0" : : "r" ((const void *) (x)))
832	# define PREFETCH_FOR_WRITE(x) \
833	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" ((const void *) (x)))
834	# endif
835	/* There seems to be some issues with trylock hanging on darwin. This
836	should be looked into some more */
837	# define NO_PTHREAD_TRYLOCK
838	# endif
839	# ifdef FREEBSD
840	# define ALIGNMENT 4
841	# define OS_TYPE "FREEBSD"
842	# ifndef GC_FREEBSD_THREADS
843	# define MPROTECT_VDB
844	# endif
845	# define SIG_SUSPEND SIGUSR1
846	# define SIG_THR_RESTART SIGUSR2
847	# define FREEBSD_STACKBOTTOM
848	# ifdef __ELF__
849	# define DYNAMIC_LOADING
850	# endif
851	extern char etext[];
852	extern char * GC_FreeBSDGetDataStart();
853	# define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
854	# endif
855	# ifdef NETBSD
856	# define ALIGNMENT 4
857	# define OS_TYPE "NETBSD"
858	# define HEURISTIC2
859	extern char etext[];
860	# define DATASTART GC_data_start
861	# define DYNAMIC_LOADING
862	# endif
863	# ifdef NOSYS
864	# define ALIGNMENT 4
865	# define OS_TYPE "NOSYS"
866	extern void __end[], __dso_handle[];
867	# define DATASTART (__dso_handle) /* OK, that's ugly. */
868	# define DATAEND (__end)
869	/* Stack starts at 0xE0000000 for the simulator. */
870	# undef STACK_GRAN
871	# define STACK_GRAN 0x10000000
872	# define HEURISTIC1
873	# endif
874	# endif
875
876	# ifdef VAX
877	# define MACH_TYPE "VAX"
878	# define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
879	extern char etext[];
880	# define DATASTART ((ptr_t)(etext))
881	# ifdef BSD
882	# define OS_TYPE "BSD"
883	# define HEURISTIC1
884	/* HEURISTIC2 may be OK, but it's hard to test. */
885	# endif
886	# ifdef ULTRIX
887	# define OS_TYPE "ULTRIX"
888	# define STACKBOTTOM ((ptr_t) 0x7fffc800)
889	# endif
890	# endif
891
892	# ifdef RT
893	# define MACH_TYPE "RT"
894	# define ALIGNMENT 4
895	# define DATASTART ((ptr_t) 0x10000000)
896	# define STACKBOTTOM ((ptr_t) 0x1fffd800)
897	# endif
898
899	# ifdef SPARC
900	# define MACH_TYPE "SPARC"
901	# if defined(__arch64__) \|\| defined(__sparcv9)
902	# define ALIGNMENT 8
903	# define CPP_WORDSZ 64
904	# define ELF_CLASS ELFCLASS64
905	# else
906	# define ALIGNMENT 4 /* Required by hardware */
907	# define CPP_WORDSZ 32
908	# endif
909	# define ALIGN_DOUBLE
910	# ifdef SUNOS5
911	# define OS_TYPE "SUNOS5"
912	extern int _etext[];
913	extern int _end[];
914	extern ptr_t GC_SysVGetDataStart();
915	# define DATASTART GC_SysVGetDataStart(0x10000, _etext)
916	# define DATAEND (_end)
917	# if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
918	# define USE_MMAP
919	/* Otherwise we now use calloc. Mmap may result in the */
920	/* heap interleaved with thread stacks, which can result in */
921	/* excessive blacklisting. Sbrk is unusable since it */
922	/* doesn't interact correctly with the system malloc. */
923	# endif
924	# ifdef USE_MMAP
925	# define HEAP_START (ptr_t)0x40000000
926	# else
927	# define HEAP_START DATAEND
928	# endif
929	# define PROC_VDB
930	/* HEURISTIC1 reportedly no longer works under 2.7. */
931	/* HEURISTIC2 probably works, but this appears to be preferable. */
932	/* Apparently USRSTACK is defined to be USERLIMIT, but in some */
933	/* installations that's undefined. We work around this with a */
934	/* gross hack: */
935	# include <sys/vmparam.h>
936	# ifdef USERLIMIT
937	/* This should work everywhere, but doesn't. */
938	# define STACKBOTTOM USRSTACK
939	# else
940	# define HEURISTIC2
941	# endif
942	# include <unistd.h>
943	# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
944	/* getpagesize() appeared to be missing from at least one */
945	/* Solaris 5.4 installation. Weird. */
946	# define DYNAMIC_LOADING
947	# endif
948	# ifdef SUNOS4
949	# define OS_TYPE "SUNOS4"
950	/* [If you have a weak stomach, don't read this.] */
951	/* We would like to use: */
952	/* # define DATASTART ((ptr_t)((((word) (etext)) + 0x1fff) & ~0x1fff)) */
953	/* This fails occasionally, due to an ancient, but very */
954	/* persistent ld bug. etext is set 32 bytes too high. */
955	/* We instead read the text segment size from the a.out */
956	/* header, which happens to be mapped into our address space */
957	/* at the start of the text segment. The detective work here */
958	/* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
959	/* Serpette of INRIA. */
960	/* This assumes ZMAGIC, i.e. demand-loadable executables. */
961	# define TEXTSTART 0x2000
962	# define DATASTART ((ptr_t)((int )(TEXTSTART+0x4)+TEXTSTART))
963	# define MPROTECT_VDB
964	# define HEURISTIC1
965	# define DYNAMIC_LOADING
966	# endif
967	# ifdef DRSNX
968	# define OS_TYPE "DRSNX"
969	extern ptr_t GC_SysVGetDataStart();
970	extern int etext[];
971	# define DATASTART GC_SysVGetDataStart(0x10000, etext)
972	# define MPROTECT_VDB
973	# define STACKBOTTOM ((ptr_t) 0xdfff0000)
974	# define DYNAMIC_LOADING
975	# endif
976	# ifdef LINUX
977	# define OS_TYPE "LINUX"
978	# ifdef __ELF__
979	# define DYNAMIC_LOADING
980	# else
981	Linux Sparc/a.out not supported
982	# endif
983	extern int _end[];
984	extern int _etext[];
985	# define DATAEND (_end)
986	# define SVR4
987	extern ptr_t GC_SysVGetDataStart();
988	# ifdef __arch64__
989	# define DATASTART GC_SysVGetDataStart(0x100000, _etext)
990	# else
991	# define DATASTART GC_SysVGetDataStart(0x10000, _etext)
992	# endif
993	# define LINUX_STACKBOTTOM
994	# endif
995	# ifdef OPENBSD
996	# define OS_TYPE "OPENBSD"
997	# define STACKBOTTOM ((ptr_t) 0xf8000000)
998	extern int etext[];
999	# define DATASTART ((ptr_t)(etext))
1000	# endif
1001	# ifdef NETBSD
1002	# define OS_TYPE "NETBSD"
1003	# define HEURISTIC2
1004	# ifdef __ELF__
1005	# define DATASTART GC_data_start
1006	# define DYNAMIC_LOADING
1007	# else
1008	extern char etext[];
1009	# define DATASTART ((ptr_t)(etext))
1010	# endif
1011	# endif
1012	# ifdef FREEBSD
1013	# define OS_TYPE "FREEBSD"
1014	# define SIG_SUSPEND SIGUSR1
1015	# define SIG_THR_RESTART SIGUSR2
1016	# define FREEBSD_STACKBOTTOM
1017	# ifdef __ELF__
1018	# define DYNAMIC_LOADING
1019	# endif
1020	extern char etext[];
1021	extern char edata[];
1022	extern char end[];
1023	# define NEED_FIND_LIMIT
1024	# define DATASTART ((ptr_t)(&etext))
1025	# define DATAEND (GC_find_limit (DATASTART, TRUE))
1026	# define DATASTART2 ((ptr_t)(&edata))
1027	# define DATAEND2 ((ptr_t)(&end))
1028	# endif
1029	# endif
1030
1031	# ifdef I386
1032	# define MACH_TYPE "I386"
1033	# if defined(__LP64__) \|\| defined(_WIN64)
1034	# define CPP_WORDSZ 64
1035	# define ALIGNMENT 8
1036	# else
1037	# define CPP_WORDSZ 32
1038	# define ALIGNMENT 4
1039	/* Appears to hold for all "32 bit" compilers */
1040	/* except Borland. The -a4 option fixes */
1041	/* Borland. */
1042	/* Ivan Demakov: For Watcom the option is -zp4. */
1043	# endif
1044	# ifndef SMALL_CONFIG
1045	# define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
1046	/* improvement on Pentiums. */
1047	# endif
1048	# ifdef HAVE_BUILTIN_UNWIND_INIT
1049	# define USE_GENERIC_PUSH_REGS
1050	# endif
1051	# ifdef SEQUENT
1052	# define OS_TYPE "SEQUENT"
1053	extern int etext[];
1054	# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1055	# define STACKBOTTOM ((ptr_t) 0x3ffff000)
1056	# endif
1057	# ifdef BEOS
1058	# define OS_TYPE "BEOS"
1059	# include <OS.h>
1060	# define GETPAGESIZE() B_PAGE_SIZE
1061	extern int etext[];
1062	# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1063	# endif
1064	# ifdef SUNOS5
1065	# define OS_TYPE "SUNOS5"
1066	extern int _etext[], _end[];
1067	extern ptr_t GC_SysVGetDataStart();
1068	# define DATASTART GC_SysVGetDataStart(0x1000, _etext)
1069	# define DATAEND (_end)
1070	/* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
1071	/* but reportedly breaks under 2.8. It appears that the stack */
1072	/* base is a property of the executable, so this should not break */
1073	/* old executables. */
1074	/* HEURISTIC2 probably works, but this appears to be preferable. */
1075	# include <sys/vm.h>
1076	# define STACKBOTTOM USRSTACK
1077	/* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
1078	/* It appears to be fixed in 2.8 and 2.9. */
1079	# ifdef SOLARIS25_PROC_VDB_BUG_FIXED
1080	# define PROC_VDB
1081	# endif
1082	# define DYNAMIC_LOADING
1083	# if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
1084	# define USE_MMAP
1085	/* Otherwise we now use calloc. Mmap may result in the */
1086	/* heap interleaved with thread stacks, which can result in */
1087	/* excessive blacklisting. Sbrk is unusable since it */
1088	/* doesn't interact correctly with the system malloc. */
1089	# endif
1090	# ifdef USE_MMAP
1091	# define HEAP_START (ptr_t)0x40000000
1092	# else
1093	# define HEAP_START DATAEND
1094	# endif
1095	# endif
1096	# ifdef SCO
1097	# define OS_TYPE "SCO"
1098	extern int etext[];
1099	# define DATASTART ((ptr_t)((((word) (etext)) + 0x3fffff) \
1100	& ~0x3fffff) \
1101	+((word)etext & 0xfff))
1102	# define STACKBOTTOM ((ptr_t) 0x7ffffffc)
1103	# endif
1104	# ifdef SCO_ELF
1105	# define OS_TYPE "SCO_ELF"
1106	extern int etext[];
1107	# define DATASTART ((ptr_t)(etext))
1108	# define STACKBOTTOM ((ptr_t) 0x08048000)
1109	# define DYNAMIC_LOADING
1110	# define ELF_CLASS ELFCLASS32
1111	# endif
1112	# ifdef DGUX
1113	# define OS_TYPE "DGUX"
1114	extern int _etext, _end;
1115	extern ptr_t GC_SysVGetDataStart();
1116	# define DATASTART GC_SysVGetDataStart(0x1000, &_etext)
1117	# define DATAEND (&_end)
1118	# define STACK_GROWS_DOWN
1119	# define HEURISTIC2
1120	# include <unistd.h>
1121	# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1122	# define DYNAMIC_LOADING
1123	# ifndef USE_MMAP
1124	# define USE_MMAP
1125	# endif /* USE_MMAP */
1126	# define MAP_FAILED (void *) -1
1127	# ifdef USE_MMAP
1128	# define HEAP_START (ptr_t)0x40000000
1129	# else /* USE_MMAP */
1130	# define HEAP_START DATAEND
1131	# endif /* USE_MMAP */
1132	# endif /* DGUX */
1133
1134	# ifdef LINUX
1135	# ifndef __GNUC__
1136	/* The Intel compiler doesn't like inline assembly */
1137	# define USE_GENERIC_PUSH_REGS
1138	# endif
1139	# define OS_TYPE "LINUX"
1140	# define LINUX_STACKBOTTOM
1141	# if 0
1142	# define HEURISTIC1
1143	# undef STACK_GRAN
1144	# define STACK_GRAN 0x10000000
1145	/* STACKBOTTOM is usually 0xc0000000, but this changes with */
1146	/* different kernel configurations. In particular, systems */
1147	/* with 2GB physical memory will usually move the user */
1148	/* address space limit, and hence initial SP to 0x80000000. */
1149	# endif
1150	# if !defined(GC_LINUX_THREADS) \|\| !defined(REDIRECT_MALLOC)
1151	# define MPROTECT_VDB
1152	# else
1153	/* We seem to get random errors in incremental mode, */
1154	/* possibly because Linux threads is itself a malloc client */
1155	/* and can't deal with the signals. */
1156	# endif
1157	# define HEAP_START (ptr_t)0x1000
1158	/* This encourages mmap to give us low addresses, */
1159	/* thus allowing the heap to grow to ~3GB */
1160	# ifdef __ELF__
1161	# define DYNAMIC_LOADING
1162	# ifdef UNDEFINED /* includes ro data */
1163	extern int _etext[];
1164	# define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
1165	# endif
1166	# include <features.h>
1167	# if defined(__GLIBC__) && __GLIBC__ >= 2
1168	# define SEARCH_FOR_DATA_START
1169	# else
1170	extern char **__environ;
1171	# define DATASTART ((ptr_t)(&__environ))
1172	/* hideous kludge: __environ is the first */
1173	/* word in crt0.o, and delimits the start */
1174	/* of the data segment, no matter which */
1175	/* ld options were passed through. */
1176	/* We could use _etext instead, but that */
1177	/* would include .rodata, which may */
1178	/* contain large read-only data tables */
1179	/* that we'd rather not scan. */
1180	# endif
1181	extern int _end[];
1182	# define DATAEND (_end)
1183	# else
1184	extern int etext[];
1185	# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1186	# endif
1187	# ifdef USE_I686_PREFETCH
1188	/* FIXME: Thus should use __builtin_prefetch, but we'll leave that */
1189	/* for the next rtelease. */
1190	# define PREFETCH(x) \
1191	__asm__ __volatile__ (" prefetchnta %0": : "m"((char )(x)))
1192	/* Empirically prefetcht0 is much more effective at reducing */
1193	/* cache miss stalls for the targetted load instructions. But it */
1194	/* seems to interfere enough with other cache traffic that the net */
1195	/* result is worse than prefetchnta. */
1196	# if 0
1197	/* Using prefetches for write seems to have a slight negative */
1198	/* impact on performance, at least for a PIII/500. */
1199	# define PREFETCH_FOR_WRITE(x) \
1200	__asm__ __volatile__ (" prefetcht0 %0": : "m"((char )(x)))
1201	# endif
1202	# endif
1203	# ifdef USE_3DNOW_PREFETCH
1204	# define PREFETCH(x) \
1205	__asm__ __volatile__ (" prefetch %0": : "m"((char )(x)))
1206	# define PREFETCH_FOR_WRITE(x) \
1207	__asm__ __volatile__ (" prefetchw %0": : "m"((char )(x)))
1208	# endif
1209	# endif
1210	# ifdef CYGWIN32
1211	# define OS_TYPE "CYGWIN32"
1212	# define DATASTART ((ptr_t)GC_DATASTART) /* From gc.h */
1213	# define DATAEND ((ptr_t)GC_DATAEND)
1214	# undef STACK_GRAN
1215	# define STACK_GRAN 0x10000
1216	# define HEURISTIC1
1217	# endif
1218	# ifdef OS2
1219	# define OS_TYPE "OS2"
1220	/* STACKBOTTOM and DATASTART are handled specially in */
1221	/* os_dep.c. OS2 actually has the right */
1222	/* system call! */
1223	# define DATAEND /* not needed */
1224	# define USE_GENERIC_PUSH_REGS
1225	# endif
1226	# ifdef MSWIN32
1227	# define OS_TYPE "MSWIN32"
1228	/* STACKBOTTOM and DATASTART are handled specially in */
1229	/* os_dep.c. */
1230	# ifndef __WATCOMC__
1231	# define MPROTECT_VDB
1232	# endif
1233	# define DATAEND /* not needed */
1234	# endif
1235	# ifdef MSWINCE
1236	# define OS_TYPE "MSWINCE"
1237	# define DATAEND /* not needed */
1238	# endif
1239	# ifdef DJGPP
1240	# define OS_TYPE "DJGPP"
1241	# include "stubinfo.h"
1242	extern int etext[];
1243	extern int _stklen;
1244	extern int __djgpp_stack_limit;
1245	# define DATASTART ((ptr_t)((((word) (etext)) + 0x1ff) & ~0x1ff))
1246	/* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
1247	+ _stklen)) */
1248	# define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
1249	/* This may not be right. */
1250	# endif
1251	# ifdef OPENBSD
1252	# define OS_TYPE "OPENBSD"
1253	# endif
1254	# ifdef FREEBSD
1255	# define OS_TYPE "FREEBSD"
1256	# ifndef GC_FREEBSD_THREADS
1257	# define MPROTECT_VDB
1258	# endif
1259	# ifdef __GLIBC__
1260	# define SIG_SUSPEND (32+6)
1261	# define SIG_THR_RESTART (32+5)
1262	extern int _end[];
1263	# define DATAEND (_end)
1264	# else
1265	# define SIG_SUSPEND SIGUSR1
1266	# define SIG_THR_RESTART SIGUSR2
1267	# endif
1268	# define FREEBSD_STACKBOTTOM
1269	# ifdef __ELF__
1270	# define DYNAMIC_LOADING
1271	# endif
1272	extern char etext[];
1273	extern char * GC_FreeBSDGetDataStart();
1274	# define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
1275	# endif
1276	# ifdef NETBSD
1277	# define OS_TYPE "NETBSD"
1278	# ifdef __ELF__
1279	# define DYNAMIC_LOADING
1280	# endif
1281	# endif
1282	# ifdef THREE86BSD
1283	# define OS_TYPE "THREE86BSD"
1284	# endif
1285	# ifdef BSDI
1286	# define OS_TYPE "BSDI"
1287	# endif
1288	# if defined(OPENBSD) \|\| defined(NETBSD) \
1289	\|\| defined(THREE86BSD) \|\| defined(BSDI)
1290	# define HEURISTIC2
1291	extern char etext[];
1292	# define DATASTART ((ptr_t)(etext))
1293	# endif
1294	# ifdef NEXT
1295	# define OS_TYPE "NEXT"
1296	# define DATASTART ((ptr_t) get_etext())
1297	# define STACKBOTTOM ((ptr_t)0xc0000000)
1298	# define DATAEND /* not needed */
1299	# endif
1300	# ifdef DOS4GW
1301	# define OS_TYPE "DOS4GW"
1302	extern long __nullarea;
1303	extern char _end;
1304	extern char *_STACKTOP;
1305	/* Depending on calling conventions Watcom C either precedes
1306	or does not precedes with undescore names of C-variables.
1307	Make sure startup code variables always have the same names. */
1308	#pragma aux __nullarea "*";
1309	#pragma aux _end "*";
1310	# define STACKBOTTOM ((ptr_t) _STACKTOP)
1311	/* confused? me too. */
1312	# define DATASTART ((ptr_t) &__nullarea)
1313	# define DATAEND ((ptr_t) &_end)
1314	# endif
1315	# ifdef HURD
1316	# define OS_TYPE "HURD"
1317	# define STACK_GROWS_DOWN
1318	# define HEURISTIC2
1319	extern int __data_start[];
1320	# define DATASTART ( (ptr_t) (__data_start))
1321	extern int _end[];
1322	# define DATAEND ( (ptr_t) (_end))
1323	/* # define MPROTECT_VDB Not quite working yet? */
1324	# define DYNAMIC_LOADING
1325	# endif
1326	# ifdef DARWIN
1327	# define OS_TYPE "DARWIN"
1328	# define DARWIN_DONT_PARSE_STACK
1329	# define DYNAMIC_LOADING
1330	/* XXX: see get_end(3), get_etext() and get_end() should not be used.
1331	These aren't used when dyld support is enabled (it is by default) */
1332	# define DATASTART ((ptr_t) get_etext())
1333	# define DATAEND ((ptr_t) get_end())
1334	# define STACKBOTTOM ((ptr_t) 0xc0000000)
1335	# define USE_MMAP
1336	# define USE_MMAP_ANON
1337	# define USE_ASM_PUSH_REGS
1338	/* This is potentially buggy. It needs more testing. See the comments in
1339	os_dep.c. It relies on threads to track writes. */
1340	# ifdef GC_DARWIN_THREADS
1341	/* # define MPROTECT_VDB -- disabled for now. May work for some apps. */
1342	# endif
1343	# include <unistd.h>
1344	# define GETPAGESIZE() getpagesize()
1345	/* There seems to be some issues with trylock hanging on darwin. This
1346	should be looked into some more */
1347	# define NO_PTHREAD_TRYLOCK
1348	# endif /* DARWIN */
1349	# endif
1350
1351	# ifdef NS32K
1352	# define MACH_TYPE "NS32K"
1353	# define ALIGNMENT 4
1354	extern char **environ;
1355	# define DATASTART ((ptr_t)(&environ))
1356	/* hideous kludge: environ is the first */
1357	/* word in crt0.o, and delimits the start */
1358	/* of the data segment, no matter which */
1359	/* ld options were passed through. */
1360	# define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
1361	# endif
1362
1363	# ifdef MIPS
1364	# define MACH_TYPE "MIPS"
1365	# ifdef LINUX
1366	/* This was developed for a linuxce style platform. Probably */
1367	/* needs to be tweaked for workstation class machines. */
1368	# define OS_TYPE "LINUX"
1369	# define DYNAMIC_LOADING
1370	extern int _end[];
1371	# define DATAEND (_end)
1372	extern int __data_start[];
1373	# define DATASTART ((ptr_t)(__data_start))
1374	# define ALIGNMENT 4
1375	# define USE_GENERIC_PUSH_REGS
1376	# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2 \|\| __GLIBC__ > 2
1377	# define LINUX_STACKBOTTOM
1378	# else
1379	# define STACKBOTTOM 0x80000000
1380	# endif
1381	# endif /* Linux */
1382	# ifdef EWS4800
1383	# define HEURISTIC2
1384	# if defined(_MIPS_SZPTR) && (_MIPS_SZPTR == 64)
1385	extern int _fdata[], _end[];
1386	# define DATASTART ((ptr_t)_fdata)
1387	# define DATAEND ((ptr_t)_end)
1388	# define CPP_WORDSZ _MIPS_SZPTR
1389	# define ALIGNMENT (_MIPS_SZPTR/8)
1390	# else
1391	extern int etext[], edata[], end[];
1392	extern int _DYNAMIC_LINKING[], _gp[];
1393	# define DATASTART ((ptr_t)((((word)etext + 0x3ffff) & ~0x3ffff) \
1394	+ ((word)etext & 0xffff)))
1395	# define DATAEND (edata)
1396	# define DATASTART2 (_DYNAMIC_LINKING \
1397	? (ptr_t)(((word)_gp + 0x8000 + 0x3ffff) & ~0x3ffff) \
1398	: (ptr_t)edata)
1399	# define DATAEND2 (end)
1400	# define ALIGNMENT 4
1401	# endif
1402	# define OS_TYPE "EWS4800"
1403	# define USE_GENERIC_PUSH_REGS 1
1404	# endif
1405	# ifdef ULTRIX
1406	# define HEURISTIC2
1407	# define DATASTART (ptr_t)0x10000000
1408	/* Could probably be slightly higher since */
1409	/* startup code allocates lots of stuff. */
1410	# define OS_TYPE "ULTRIX"
1411	# define ALIGNMENT 4
1412	# endif
1413	# ifdef RISCOS
1414	# define HEURISTIC2
1415	# define DATASTART (ptr_t)0x10000000
1416	# define OS_TYPE "RISCOS"
1417	# define ALIGNMENT 4 /* Required by hardware */
1418	# endif
1419	# ifdef IRIX5
1420	# define HEURISTIC2
1421	extern int _fdata[];
1422	# define DATASTART ((ptr_t)(_fdata))
1423	# ifdef USE_MMAP
1424	# define HEAP_START (ptr_t)0x30000000
1425	# else
1426	# define HEAP_START DATASTART
1427	# endif
1428	/* Lowest plausible heap address. */
1429	/* In the MMAP case, we map there. */
1430	/* In either case it is used to identify */
1431	/* heap sections so they're not */
1432	/* considered as roots. */
1433	# define OS_TYPE "IRIX5"
1434	/# define MPROTECT_VDB DOB: this should work, but there is evidence /
1435	/* of recent breakage. */
1436	# ifdef _MIPS_SZPTR
1437	# define CPP_WORDSZ _MIPS_SZPTR
1438	# define ALIGNMENT (_MIPS_SZPTR/8)
1439	# if CPP_WORDSZ != 64
1440	# define ALIGN_DOUBLE
1441	# endif
1442	# else
1443	# define ALIGNMENT 4
1444	# define ALIGN_DOUBLE
1445	# endif
1446	# define DYNAMIC_LOADING
1447	# endif
1448	# ifdef MSWINCE
1449	# define OS_TYPE "MSWINCE"
1450	# define ALIGNMENT 4
1451	# define DATAEND /* not needed */
1452	# endif
1453	# if defined(NETBSD)
1454	# define OS_TYPE "NETBSD"
1455	# define ALIGNMENT 4
1456	# define HEURISTIC2
1457	# define USE_GENERIC_PUSH_REGS
1458	# ifdef __ELF__
1459	extern int etext[];
1460	# define DATASTART GC_data_start
1461	# define NEED_FIND_LIMIT
1462	# define DYNAMIC_LOADING
1463	# else
1464	# define DATASTART ((ptr_t) 0x10000000)
1465	# define STACKBOTTOM ((ptr_t) 0x7ffff000)
1466	# endif /* _ELF_ */
1467	# endif
1468	# if defined(NONSTOP)
1469	# define CPP_WORDSZ 32
1470	# define OS_TYPE "NONSTOP"
1471	# define ALIGNMENT 4
1472	# define DATASTART ((ptr_t) 0x08000000)
1473	extern int _end[];
1474	# define DATAEND (_end)
1475	# define STACKBOTTOM ((ptr_t) 0x4fffffff)
1476	# define USE_GENERIC_PUSH_REGS
1477	# endif
1478	# endif
1479
1480	# ifdef RS6000
1481	# define MACH_TYPE "RS6000"
1482	# ifdef ALIGNMENT
1483	# undef ALIGNMENT
1484	# endif
1485	# ifdef IA64
1486	# undef IA64 /* DOB: some AIX installs stupidly define IA64 in /usr/include/sys/systemcfg.h */
1487	# endif
1488	# ifdef __64BIT__
1489	# define ALIGNMENT 8
1490	# define CPP_WORDSZ 64
1491	# define STACKBOTTOM ((ptr_t)0x1000000000000000)
1492	# else
1493	# define ALIGNMENT 4
1494	# define CPP_WORDSZ 32
1495	# define STACKBOTTOM ((ptr_t)((ulong)&errno))
1496	# endif
1497	# define USE_MMAP
1498	# define USE_MMAP_ANON
1499	/* From AIX linker man page:
1500	_text Specifies the first location of the program.
1501	_etext Specifies the first location after the program.
1502	_data Specifies the first location of the data.
1503	_edata Specifies the first location after the initialized data
1504	_end or end Specifies the first location after all data.
1505	*/
1506	extern int _data[], _end[];
1507	# define DATASTART ((ptr_t)((ulong)_data))
1508	# define DATAEND ((ptr_t)((ulong)_end))
1509	extern int errno;
1510	# define USE_GENERIC_PUSH_REGS
1511	# define DYNAMIC_LOADING
1512	/* For really old versions of AIX, this may have to be removed. */
1513	# endif
1514
1515	# ifdef HP_PA
1516	# define MACH_TYPE "HP_PA"
1517	# ifdef __LP64__
1518	# define CPP_WORDSZ 64
1519	# define ALIGNMENT 8
1520	# else
1521	# define CPP_WORDSZ 32
1522	# define ALIGNMENT 4
1523	# define ALIGN_DOUBLE
1524	# endif
1525	# if !defined(GC_HPUX_THREADS) && !defined(GC_LINUX_THREADS)
1526	# ifndef LINUX /* For now. */
1527	# define MPROTECT_VDB
1528	# endif
1529	# else
1530	# define GENERIC_COMPARE_AND_SWAP
1531	/* No compare-and-swap instruction. Use pthread mutexes */
1532	/* when we absolutely have to. */
1533	# ifdef PARALLEL_MARK
1534	# define USE_MARK_BYTES
1535	/* Minimize compare-and-swap usage. */
1536	# endif
1537	# endif
1538	# define STACK_GROWS_UP
1539	# ifdef HPUX
1540	# define OS_TYPE "HPUX"
1541	extern int __data_start[];
1542	# define DATASTART ((ptr_t)(__data_start))
1543	# if 0
1544	/* The following appears to work for 7xx systems running HP/UX */
1545	/* 9.xx Furthermore, it might result in much faster */
1546	/* collections than HEURISTIC2, which may involve scanning */
1547	/* segments that directly precede the stack. It is not the */
1548	/* default, since it may not work on older machine/OS */
1549	/* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1550	/* this.) */
1551	# define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1552	# else
1553	/* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1554	/* to this. Note that the GC must be initialized before the */
1555	/* first putenv call. */
1556	extern char ** environ;
1557	# define STACKBOTTOM ((ptr_t)environ)
1558	# endif
1559	# define DYNAMIC_LOADING
1560	# include <unistd.h>
1561	# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1562	# ifndef __GNUC__
1563	# define PREFETCH(x) { \
1564	register long addr = (long)(x); \
1565	(void) _asm ("LDW", 0, 0, addr, 0); \
1566	}
1567	# endif
1568	# endif /* HPUX */
1569	# ifdef LINUX
1570	# define OS_TYPE "LINUX"
1571	# define LINUX_STACKBOTTOM
1572	# define DYNAMIC_LOADING
1573	# define SEARCH_FOR_DATA_START
1574	extern int _end[];
1575	# define DATAEND (&_end)
1576	# endif /* LINUX */
1577	# endif /* HP_PA */
1578
1579	# ifdef ALPHA
1580	# define MACH_TYPE "ALPHA"
1581	# define ALIGNMENT 8
1582	# define CPP_WORDSZ 64
1583	# ifndef LINUX
1584	# define USE_GENERIC_PUSH_REGS
1585	/* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1586	/* fp registers in some cases when the target is a 21264. The assembly */
1587	/* code doesn't handle that yet, and version dependencies make that a */
1588	/* bit tricky. Do the easy thing for now. */
1589	# endif
1590	# ifdef NETBSD
1591	# define OS_TYPE "NETBSD"
1592	# define HEURISTIC2
1593	# define DATASTART GC_data_start
1594	# define ELFCLASS32 32
1595	# define ELFCLASS64 64
1596	# define ELF_CLASS ELFCLASS64
1597	# define DYNAMIC_LOADING
1598	# endif
1599	# ifdef OPENBSD
1600	# define OS_TYPE "OPENBSD"
1601	# define HEURISTIC2
1602	# ifdef __ELF__ /* since OpenBSD/Alpha 2.9 */
1603	# define DATASTART GC_data_start
1604	# define ELFCLASS32 32
1605	# define ELFCLASS64 64
1606	# define ELF_CLASS ELFCLASS64
1607	# else /* ECOFF, until OpenBSD/Alpha 2.7 */
1608	# define DATASTART ((ptr_t) 0x140000000)
1609	# endif
1610	# endif
1611	# ifdef FREEBSD
1612	# define OS_TYPE "FREEBSD"
1613	/* MPROTECT_VDB is not yet supported at all on FreeBSD/alpha. */
1614	# define SIG_SUSPEND SIGUSR1
1615	# define SIG_THR_RESTART SIGUSR2
1616	# define FREEBSD_STACKBOTTOM
1617	# ifdef __ELF__
1618	# define DYNAMIC_LOADING
1619	# endif
1620	/* Handle unmapped hole alpha--freebsd[45]* puts between etext and edata. */
1621	extern char etext[];
1622	extern char edata[];
1623	extern char end[];
1624	# define NEED_FIND_LIMIT
1625	# define DATASTART ((ptr_t)(&etext))
1626	# define DATAEND (GC_find_limit (DATASTART, TRUE))
1627	# define DATASTART2 ((ptr_t)(&edata))
1628	# define DATAEND2 ((ptr_t)(&end))
1629	# endif
1630	# ifdef OSF1
1631	# define OS_TYPE "OSF1"
1632	# define DATASTART ((ptr_t) 0x140000000)
1633	extern int _end[];
1634	# define DATAEND ((ptr_t) &_end)
1635	extern char ** environ;
1636	/* round up from the value of environ to the nearest page boundary */
1637	/* Probably breaks if putenv is called before collector */
1638	/* initialization. */
1639	# define STACKBOTTOM ((ptr_t)(((word)(environ) \| (getpagesize()-1))+1))
1640	/* # define HEURISTIC2 */
1641	/* Normally HEURISTIC2 is too conervative, since */
1642	/* the text segment immediately follows the stack. */
1643	/* Hence we give an upper pound. */
1644	/* This is currently unused, since we disabled HEURISTIC2 */
1645	extern int __start[];
1646	# define HEURISTIC2_LIMIT ((ptr_t)((word)(__start) & ~(getpagesize()-1)))
1647	# ifndef GC_OSF1_THREADS
1648	/* Unresolved signal issues with threads. */
1649	# define MPROTECT_VDB
1650	# endif
1651	# define DYNAMIC_LOADING
1652	# endif
1653	# ifdef LINUX
1654	# define OS_TYPE "LINUX"
1655	# define LINUX_STACKBOTTOM
1656	# ifdef __ELF__
1657	# define SEARCH_FOR_DATA_START
1658	# define DYNAMIC_LOADING
1659	# else
1660	# define DATASTART ((ptr_t) 0x140000000)
1661	# endif
1662	extern int _end[];
1663	# define DATAEND (_end)
1664	# define MPROTECT_VDB
1665	/* Has only been superficially tested. May not */
1666	/* work on all versions. */
1667	# endif
1668	# endif
1669
1670	# ifdef IA64
1671	# define MACH_TYPE "IA64"
1672	# define USE_GENERIC_PUSH_REGS
1673	/* We need to get preserved registers in addition to register */
1674	/* windows. That's easiest to do with setjmp. */
1675	# ifdef PARALLEL_MARK
1676	# define USE_MARK_BYTES
1677	/* Compare-and-exchange is too expensive to use for */
1678	/* setting mark bits. */
1679	# endif
1680	# ifdef HPUX
1681	# ifdef _ILP32
1682	# define CPP_WORDSZ 32
1683	# define ALIGN_DOUBLE
1684	/* Requires 8 byte alignment for malloc */
1685	# define ALIGNMENT 4
1686	# else
1687	# ifndef _LP64
1688	---> unknown ABI
1689	# endif
1690	# define CPP_WORDSZ 64
1691	# define ALIGN_DOUBLE
1692	/* Requires 16 byte alignment for malloc */
1693	# define ALIGNMENT 8
1694	# endif
1695	# define OS_TYPE "HPUX"
1696	extern int __data_start[];
1697	# define DATASTART ((ptr_t)(__data_start))
1698	/* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1699	/* to this. Note that the GC must be initialized before the */
1700	/* first putenv call. */
1701	extern char ** environ;
1702	# define STACKBOTTOM ((ptr_t)environ)
1703	# define HPUX_STACKBOTTOM
1704	# define DYNAMIC_LOADING
1705	# include <unistd.h>
1706	# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1707	/* The following was empirically determined, and is probably */
1708	/* not very robust. */
1709	/* Note that the backing store base seems to be at a nice */
1710	/* address minus one page. */
1711	# define BACKING_STORE_DISPLACEMENT 0x1000000
1712	# define BACKING_STORE_ALIGNMENT 0x1000
1713	extern ptr_t GC_register_stackbottom;
1714	# define BACKING_STORE_BASE GC_register_stackbottom
1715	/* Known to be wrong for recent HP/UX versions!!! */
1716	# endif
1717	# ifdef LINUX
1718	# define CPP_WORDSZ 64
1719	# define ALIGN_DOUBLE
1720	/* Requires 16 byte alignment for malloc */
1721	# define ALIGNMENT 8
1722	# define OS_TYPE "LINUX"
1723	/* The following works on NUE and older kernels: */
1724	/* # define STACKBOTTOM ((ptr_t) 0xa000000000000000l) */
1725	/* This does not work on NUE: */
1726	# define LINUX_STACKBOTTOM
1727	/* We also need the base address of the register stack */
1728	/* backing store. This is computed in */
1729	/* GC_linux_register_stack_base based on the following */
1730	/* constants: */
1731	# define BACKING_STORE_ALIGNMENT 0x100000
1732	# define BACKING_STORE_DISPLACEMENT 0x80000000
1733	extern ptr_t GC_register_stackbottom;
1734	# define BACKING_STORE_BASE GC_register_stackbottom
1735	# define SEARCH_FOR_DATA_START
1736	# ifdef __GNUC__
1737	# define DYNAMIC_LOADING
1738	# else
1739	/* In the Intel compiler environment, we seem to end up with */
1740	/* statically linked executables and an undefined reference */
1741	/* to _DYNAMIC */
1742	# endif
1743	# define MPROTECT_VDB
1744	/* Requires Linux 2.3.47 or later. */
1745	extern int _end[];
1746	# define DATAEND (_end)
1747	# ifdef __GNUC__
1748	# ifndef __INTEL_COMPILER
1749	# define PREFETCH(x) \
1750	__asm__ (" lfetch [%0]": : "r"(x))
1751	# define PREFETCH_FOR_WRITE(x) \
1752	__asm__ (" lfetch.excl [%0]": : "r"(x))
1753	# define CLEAR_DOUBLE(x) \
1754	__asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1755	# else
1756	# include <ia64intrin.h>
1757	# define PREFETCH(x) \
1758	__lfetch(__lfhint_none, (x))
1759	# define PREFETCH_FOR_WRITE(x) \
1760	__lfetch(__lfhint_nta, (x))
1761	# define CLEAR_DOUBLE(x) \
1762	__stf_spill((void *)(x), 0)
1763	# endif // __INTEL_COMPILER
1764	# endif
1765	# endif
1766	# ifdef MSWIN32
1767	/* FIXME: This is a very partial guess. There is no port, yet. */
1768	# define OS_TYPE "MSWIN32"
1769	/* STACKBOTTOM and DATASTART are handled specially in */
1770	/* os_dep.c. */
1771	# define DATAEND /* not needed */
1772	# if defined(_WIN64)
1773	# define CPP_WORDSZ 64
1774	# else
1775	# define CPP_WORDSZ 32 /* Is this possible? */
1776	# endif
1777	# define ALIGNMENT 8
1778	# endif
1779	# endif
1780
1781	# ifdef M88K
1782	# define MACH_TYPE "M88K"
1783	# define ALIGNMENT 4
1784	# define ALIGN_DOUBLE
1785	extern int etext[];
1786	# ifdef CX_UX
1787	# define OS_TYPE "CX_UX"
1788	# define DATASTART ((((word)etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1789	# endif
1790	# ifdef DGUX
1791	# define OS_TYPE "DGUX"
1792	extern ptr_t GC_SysVGetDataStart();
1793	# define DATASTART GC_SysVGetDataStart(0x10000, etext)
1794	# endif
1795	# define STACKBOTTOM ((char)0xf0000000) / determined empirically */
1796	# endif
1797
1798	# ifdef S370
1799	/* If this still works, and if anyone cares, this should probably */
1800	/* be moved to the S390 category. */
1801	# define MACH_TYPE "S370"
1802	# define ALIGNMENT 4 /* Required by hardware */
1803	# define USE_GENERIC_PUSH_REGS
1804	# ifdef UTS4
1805	# define OS_TYPE "UTS4"
1806	extern int etext[];
1807	extern int _etext[];
1808	extern int _end[];
1809	extern ptr_t GC_SysVGetDataStart();
1810	# define DATASTART GC_SysVGetDataStart(0x10000, _etext)
1811	# define DATAEND (_end)
1812	# define HEURISTIC2
1813	# endif
1814	# endif
1815
1816	# ifdef S390
1817	# define MACH_TYPE "S390"
1818	# define USE_GENERIC_PUSH_REGS
1819	# ifndef __s390x__
1820	# define ALIGNMENT 4
1821	# define CPP_WORDSZ 32
1822	# else
1823	# define ALIGNMENT 8
1824	# define CPP_WORDSZ 64
1825	# endif
1826	# ifndef HBLKSIZE
1827	# define HBLKSIZE 4096
1828	# endif
1829	# ifdef LINUX
1830	# define OS_TYPE "LINUX"
1831	# define LINUX_STACKBOTTOM
1832	# define DYNAMIC_LOADING
1833	extern int __data_start[];
1834	# define DATASTART ((ptr_t)(__data_start))
1835	extern int _end[];
1836	# define DATAEND (_end)
1837	# define CACHE_LINE_SIZE 256
1838	# define GETPAGESIZE() 4096
1839	# endif
1840	# endif
1841
1842	# if defined(PJ)
1843	# define ALIGNMENT 4
1844	extern int _etext[];
1845	# define DATASTART ((ptr_t)(_etext))
1846	# define HEURISTIC1
1847	# endif
1848
1849	# ifdef ARM32
1850	# define CPP_WORDSZ 32
1851	# define MACH_TYPE "ARM32"
1852	# define ALIGNMENT 4
1853	# ifdef NETBSD
1854	# define OS_TYPE "NETBSD"
1855	# define HEURISTIC2
1856	# ifdef __ELF__
1857	# define DATASTART GC_data_start
1858	# define DYNAMIC_LOADING
1859	# else
1860	extern char etext[];
1861	# define DATASTART ((ptr_t)(etext))
1862	# endif
1863	# define USE_GENERIC_PUSH_REGS
1864	# endif
1865	# ifdef LINUX
1866	# define OS_TYPE "LINUX"
1867	# define LINUX_STACKBOTTOM
1868	# undef STACK_GRAN
1869	# define STACK_GRAN 0x10000000
1870	# define USE_GENERIC_PUSH_REGS
1871	# ifdef __ELF__
1872	# define DYNAMIC_LOADING
1873	# include <features.h>
1874	# if defined(__GLIBC__) && __GLIBC__ >= 2
1875	# define SEARCH_FOR_DATA_START
1876	# else
1877	extern char **__environ;
1878	# define DATASTART ((ptr_t)(&__environ))
1879	/* hideous kludge: __environ is the first */
1880	/* word in crt0.o, and delimits the start */
1881	/* of the data segment, no matter which */
1882	/* ld options were passed through. */
1883	/* We could use _etext instead, but that */
1884	/* would include .rodata, which may */
1885	/* contain large read-only data tables */
1886	/* that we'd rather not scan. */
1887	# endif
1888	extern int _end[];
1889	# define DATAEND (_end)
1890	# else
1891	extern int etext[];
1892	# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1893	# endif
1894	# endif
1895	# ifdef MSWINCE
1896	# define OS_TYPE "MSWINCE"
1897	# define DATAEND /* not needed */
1898	# endif
1899	# ifdef NOSYS
1900	/* __data_start is usually defined in the target linker script. */
1901	extern int __data_start[];
1902	# define DATASTART (ptr_t)(__data_start)
1903	# define USE_GENERIC_PUSH_REGS
1904	/* __stack_base__ is set in newlib/libc/sys/arm/crt0.S */
1905	extern void *__stack_base__;
1906	# define STACKBOTTOM ((ptr_t) (__stack_base__))
1907	# endif
1908	#endif
1909
1910	# ifdef CRIS
1911	# define MACH_TYPE "CRIS"
1912	# define CPP_WORDSZ 32
1913	# define ALIGNMENT 1
1914	# define OS_TYPE "LINUX"
1915	# define DYNAMIC_LOADING
1916	# define LINUX_STACKBOTTOM
1917	# define USE_GENERIC_PUSH_REGS
1918	# define SEARCH_FOR_DATA_START
1919	extern int _end[];
1920	# define DATAEND (_end)
1921	# endif
1922
1923	# ifdef SH
1924	# define MACH_TYPE "SH"
1925	# define ALIGNMENT 4
1926	# ifdef MSWINCE
1927	# define OS_TYPE "MSWINCE"
1928	# define DATAEND /* not needed */
1929	# endif
1930	# ifdef LINUX
1931	# define OS_TYPE "LINUX"
1932	# define LINUX_STACKBOTTOM
1933	# define USE_GENERIC_PUSH_REGS
1934	# define DYNAMIC_LOADING
1935	# define SEARCH_FOR_DATA_START
1936	extern int _end[];
1937	# define DATAEND (_end)
1938	# endif
1939	# ifdef NETBSD
1940	# define OS_TYPE "NETBSD"
1941	# define HEURISTIC2
1942	# define DATASTART GC_data_start
1943	# define USE_GENERIC_PUSH_REGS
1944	# define DYNAMIC_LOADING
1945	# endif
1946	# endif
1947
1948	# ifdef SH4
1949	# define MACH_TYPE "SH4"
1950	# define OS_TYPE "MSWINCE"
1951	# define ALIGNMENT 4
1952	# define DATAEND /* not needed */
1953	# endif
1954
1955	# ifdef M32R
1956	# define CPP_WORDSZ 32
1957	# define MACH_TYPE "M32R"
1958	# define ALIGNMENT 4
1959	# ifdef LINUX
1960	# define OS_TYPE "LINUX"
1961	# define LINUX_STACKBOTTOM
1962	# undef STACK_GRAN
1963	# define STACK_GRAN 0x10000000
1964	# define USE_GENERIC_PUSH_REGS
1965	# define DYNAMIC_LOADING
1966	# define SEARCH_FOR_DATA_START
1967	extern int _end[];
1968	# define DATAEND (_end)
1969	# endif
1970	# endif
1971
1972	# ifdef X86_64
1973	# define MACH_TYPE "X86_64"
1974	# define ALIGNMENT 8
1975	# define CPP_WORDSZ 64
1976	# ifndef HBLKSIZE
1977	# define HBLKSIZE 4096
1978	# endif
1979	# define CACHE_LINE_SIZE 64
1980	# define USE_GENERIC_PUSH_REGS
1981	# ifdef LINUX
1982	# define OS_TYPE "LINUX"
1983	# define LINUX_STACKBOTTOM
1984	# if !defined(GC_LINUX_THREADS) \|\| !defined(REDIRECT_MALLOC)
1985	# define MPROTECT_VDB
1986	# else
1987	/* We seem to get random errors in incremental mode, */
1988	/* possibly because Linux threads is itself a malloc client */
1989	/* and can't deal with the signals. */
1990	# endif
1991	# ifdef __ELF__
1992	# define DYNAMIC_LOADING
1993	# ifdef UNDEFINED /* includes ro data */
1994	extern int _etext[];
1995	# define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
1996	# endif
1997	# include <features.h>
1998	# define SEARCH_FOR_DATA_START
1999	extern int _end[];
2000	# define DATAEND (_end)
2001	# else
2002	extern int etext[];
2003	# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
2004	# endif
2005	# if defined(__GNUC__) && __GNUC >= 3
2006	# define PREFETCH(x) __builtin_prefetch((x), 0, 0)
2007	# define PREFETCH_FOR_WRITE(x) __builtin_prefetch((x), 1)
2008	# endif
2009	# endif
2010	# ifdef FREEBSD
2011	# define OS_TYPE "FREEBSD"
2012	# ifndef GC_FREEBSD_THREADS
2013	# define MPROTECT_VDB
2014	# endif
2015	# ifdef __GLIBC__
2016	# define SIG_SUSPEND (32+6)
2017	# define SIG_THR_RESTART (32+5)
2018	extern int _end[];
2019	# define DATAEND (_end)
2020	# else
2021	# define SIG_SUSPEND SIGUSR1
2022	# define SIG_THR_RESTART SIGUSR2
2023	# endif
2024	# define FREEBSD_STACKBOTTOM
2025	# ifdef __ELF__
2026	# define DYNAMIC_LOADING
2027	# endif
2028	extern char etext[];
2029	extern char * GC_FreeBSDGetDataStart();
2030	# define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
2031	# endif
2032	# ifdef NETBSD
2033	# define OS_TYPE "NETBSD"
2034	# ifdef __ELF__
2035	# define DYNAMIC_LOADING
2036	# endif
2037	# define HEURISTIC2
2038	extern char etext[];
2039	# define SEARCH_FOR_DATA_START
2040	# endif
2041	# ifdef SOLARIS
2042	# define OS_TYPE "SOLARIS"
2043	# define ELF_CLASS ELFCLASS64
2044	extern int _etext[], _end[];
2045	extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
2046	# define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
2047	# define DATAEND (_end)
2048	/* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
2049	/* but reportedly breaks under 2.8. It appears that the stack */
2050	/* base is a property of the executable, so this should not break */
2051	/* old executables. */
2052	/* HEURISTIC2 probably works, but this appears to be preferable. */
2053	/* Apparently USRSTACK is defined to be USERLIMIT, but in some */
2054	/* installations that's undefined. We work around this with a */
2055	/* gross hack: */
2056	# include <sys/vmparam.h>
2057	# ifdef USERLIMIT
2058	/* This should work everywhere, but doesn't. */
2059	# define STACKBOTTOM USRSTACK
2060	# else
2061	# define HEURISTIC2
2062	# endif
2063	/* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
2064	/* It appears to be fixed in 2.8 and 2.9. */
2065	# ifdef SOLARIS25_PROC_VDB_BUG_FIXED
2066	# define PROC_VDB
2067	# endif
2068	# define DYNAMIC_LOADING
2069	# if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
2070	# define USE_MMAP
2071	/* Otherwise we now use calloc. Mmap may result in the */
2072	/* heap interleaved with thread stacks, which can result in */
2073	/* excessive blacklisting. Sbrk is unusable since it */
2074	/* doesn't interact correctly with the system malloc. */
2075	# endif
2076	# ifdef USE_MMAP
2077	# define HEAP_START (ptr_t)0x40000000
2078	# else
2079	# define HEAP_START DATAEND
2080	# endif
2081	# endif
2082	# endif
2083
2084	#if defined(LINUX) && defined(USE_MMAP)
2085	/* The kernel may do a somewhat better job merging mappings etc. */
2086	/* with anonymous mappings. */
2087	# define USE_MMAP_ANON
2088	#endif
2089
2090	#if defined(LINUX) && defined(REDIRECT_MALLOC)
2091	/* Rld appears to allocate some memory with its own allocator, and */
2092	/* some through malloc, which might be redirected. To make this */
2093	/* work with collectable memory, we have to scan memory allocated */
2094	/* by rld's internal malloc. */
2095	# define USE_PROC_FOR_LIBRARIES
2096	#endif
2097
2098	# ifndef STACK_GROWS_UP
2099	# define STACK_GROWS_DOWN
2100	# endif
2101
2102	# ifndef CPP_WORDSZ
2103	# define CPP_WORDSZ 32
2104	# endif
2105
2106	# ifndef OS_TYPE
2107	# define OS_TYPE ""
2108	# endif
2109
2110	# ifndef DATAEND
2111	extern int end[];
2112	# define DATAEND (end)
2113	# endif
2114
2115	# if defined(SVR4) && !defined(GETPAGESIZE)
2116	# include <unistd.h>
2117	# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
2118	# endif
2119
2120	# ifndef GETPAGESIZE
2121	# if defined(SUNOS5) \|\| defined(IRIX5)
2122	# include <unistd.h>
2123	# endif
2124	# define GETPAGESIZE() getpagesize()
2125	# endif
2126
2127	# if defined(SUNOS5) \|\| defined(DRSNX) \|\| defined(UTS4)
2128	/* OS has SVR4 generic features. Probably others also qualify. */
2129	# define SVR4
2130	# endif
2131
2132	# if defined(SUNOS5) \|\| defined(DRSNX)
2133	/* OS has SUNOS5 style semi-undocumented interface to dynamic */
2134	/* loader. */
2135	# define SUNOS5DL
2136	/* OS has SUNOS5 style signal handlers. */
2137	# define SUNOS5SIGS
2138	# endif
2139
2140	# if defined(HPUX)
2141	# define SUNOS5SIGS
2142	# endif
2143
2144	# if defined(FREEBSD) && \
2145	(defined(__DragonFly__) \|\| __FreeBSD__ >= 4 \|\| (__FreeBSD_kernel__ >= 4))
2146	# define SUNOS5SIGS
2147	# endif
2148
2149	# ifdef GC_NETBSD_THREADS
2150	# define SIGRTMIN 33
2151	# define SIGRTMAX 63
2152	# endif
2153
2154	# if defined(SVR4) \|\| defined(LINUX) \|\| defined(IRIX5) \|\| defined(HPUX) \
2155	\|\| defined(OPENBSD) \|\| defined(NETBSD) \|\| defined(FREEBSD) \
2156	\|\| defined(DGUX) \|\| defined(BSD) \|\| defined(SUNOS4) \
2157	\|\| defined(_AIX) \|\| defined(DARWIN) \|\| defined(OSF1)
2158	# define UNIX_LIKE /* Basic Unix-like system calls work. */
2159	# endif
2160
2161	# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
2162	-> bad word size
2163	# endif
2164
2165	# ifdef PCR
2166	# undef DYNAMIC_LOADING
2167	# undef STACKBOTTOM
2168	# undef HEURISTIC1
2169	# undef HEURISTIC2
2170	# undef PROC_VDB
2171	# undef MPROTECT_VDB
2172	# define PCR_VDB
2173	# endif
2174
2175	# ifdef SRC_M3
2176	/* Postponed for now. */
2177	# undef PROC_VDB
2178	# undef MPROTECT_VDB
2179	# endif
2180
2181	# ifdef SMALL_CONFIG
2182	/* Presumably not worth the space it takes. */
2183	# undef PROC_VDB
2184	# undef MPROTECT_VDB
2185	# endif
2186
2187	# ifdef USE_MUNMAP
2188	# undef MPROTECT_VDB /* Can't deal with address space holes. */
2189	# endif
2190
2191	# ifdef PARALLEL_MARK
2192	# undef MPROTECT_VDB /* For now. */
2193	# endif
2194
2195	# if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
2196	# define DEFAULT_VDB
2197	# endif
2198
2199	# ifndef PREFETCH
2200	# define PREFETCH(x)
2201	# define NO_PREFETCH
2202	# endif
2203
2204	# ifndef PREFETCH_FOR_WRITE
2205	# define PREFETCH_FOR_WRITE(x)
2206	# define NO_PREFETCH_FOR_WRITE
2207	# endif
2208
2209	# ifndef CACHE_LINE_SIZE
2210	# define CACHE_LINE_SIZE 32 /* Wild guess */
2211	# endif
2212
2213	# if defined(LINUX) \|\| defined(__GLIBC__)
2214	# define REGISTER_LIBRARIES_EARLY
2215	/* We sometimes use dl_iterate_phdr, which may acquire an internal */
2216	/* lock. This isn't safe after the world has stopped. So we must */
2217	/* call GC_register_dynamic_libraries before stopping the world. */
2218	/* For performance reasons, this may be beneficial on other */
2219	/* platforms as well, though it should be avoided in win32. */
2220	# endif /* LINUX */
2221
2222	# if defined(SEARCH_FOR_DATA_START)
2223	extern ptr_t GC_data_start;
2224	# define DATASTART GC_data_start
2225	# endif
2226
2227	# ifndef CLEAR_DOUBLE
2228	# define CLEAR_DOUBLE(x) \
2229	((word*)x)[0] = 0; \
2230	((word*)x)[1] = 0;
2231	# endif /* CLEAR_DOUBLE */
2232
2233	/* Internally we use GC_SOLARIS_THREADS to test for either old or pthreads. */
2234	# if defined(GC_SOLARIS_PTHREADS) && !defined(GC_SOLARIS_THREADS)
2235	# define GC_SOLARIS_THREADS
2236	# endif
2237
2238	# if defined(GC_IRIX_THREADS) && !defined(IRIX5)
2239	--> inconsistent configuration
2240	# endif
2241	# if defined(GC_LINUX_THREADS) && !defined(LINUX)
2242	--> inconsistent configuration
2243	# endif
2244	# if defined(GC_NETBSD_THREADS) && !defined(NETBSD)
2245	--> inconsistent configuration
2246	# endif
2247	# if defined(GC_SOLARIS_THREADS) && !defined(SUNOS5)
2248	--> inconsistent configuration
2249	# endif
2250	# if defined(GC_HPUX_THREADS) && !defined(HPUX)
2251	--> inconsistent configuration
2252	# endif
2253	# if defined(GC_AIX_THREADS) && !defined(_AIX)
2254	--> inconsistent configuration
2255	# endif
2256	# if defined(GC_WIN32_THREADS) && !defined(MSWIN32) && !defined(CYGWIN32)
2257	--> inconsistent configuration
2258	# endif
2259
2260	# if defined(PCR) \|\| defined(SRC_M3) \|\| \
2261	defined(GC_SOLARIS_THREADS) \|\| defined(GC_WIN32_THREADS) \|\| \
2262	defined(GC_PTHREADS)
2263	# define THREADS
2264	# endif
2265
2266	# if defined(HP_PA) \|\| defined(M88K) \
2267	\|\| defined(POWERPC) && !defined(DARWIN) \
2268	\|\| defined(LINT) \|\| defined(MSWINCE) \|\| defined(ARM32) \|\| defined(CRIS) \
2269	\|\| (defined(I386) && defined(__LCC__))
2270	/* Use setjmp based hack to mark from callee-save registers. */
2271	/* The define should move to the individual platform */
2272	/* descriptions. */
2273	# define USE_GENERIC_PUSH_REGS
2274	# endif
2275
2276	# if defined(MSWINCE)
2277	# define NO_GETENV
2278	# endif
2279
2280	# if defined(SPARC)
2281	# define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
2282	/* include assembly code to do it well. */
2283	# endif
2284
2285	/* Can we save call chain in objects for debugging? */
2286	/* SET NFRAMES (# of saved frames) and NARGS (#of args for each */
2287	/* frame) to reasonable values for the platform. */
2288	/* Set SAVE_CALL_CHAIN if we can. SAVE_CALL_COUNT can be specified */
2289	/* at build time, though we feel free to adjust it slightly. */
2290	/* Define NEED_CALLINFO if we either save the call stack or */
2291	/* GC_ADD_CALLER is defined. */
2292	/* GC_CAN_SAVE_CALL_STACKS is set in gc.h. */
2293
2294	#if defined(SPARC)
2295	# define CAN_SAVE_CALL_ARGS
2296	#endif
2297	#if (defined(I386) \|\| defined(X86_64)) && (defined(LINUX) \|\| defined(__GLIBC__))
2298	/* SAVE_CALL_CHAIN is supported if the code is compiled to save */
2299	/* frame pointers by default, i.e. no -fomit-frame-pointer flag. */
2300	# define CAN_SAVE_CALL_ARGS
2301	#endif
2302
2303	# if defined(SAVE_CALL_COUNT) && !defined(GC_ADD_CALLER) \
2304	&& defined(GC_CAN_SAVE_CALL_STACKS)
2305	# define SAVE_CALL_CHAIN
2306	# endif
2307	# ifdef SAVE_CALL_CHAIN
2308	# if defined(SAVE_CALL_NARGS) && defined(CAN_SAVE_CALL_ARGS)
2309	# define NARGS SAVE_CALL_NARGS
2310	# else
2311	# define NARGS 0 /* Number of arguments to save for each call. */
2312	# endif
2313	# endif
2314	# ifdef SAVE_CALL_CHAIN
2315	# ifndef SAVE_CALL_COUNT
2316	# define NFRAMES 6 /* Number of frames to save. Even for */
2317	/* alignment reasons. */
2318	# else
2319	# define NFRAMES ((SAVE_CALL_COUNT + 1) & ~1)
2320	# endif
2321	# define NEED_CALLINFO
2322	# endif /* SAVE_CALL_CHAIN */
2323	# ifdef GC_ADD_CALLER
2324	# define NFRAMES 1
2325	# define NARGS 0
2326	# define NEED_CALLINFO
2327	# endif
2328
2329	# if defined(MAKE_BACK_GRAPH) && !defined(DBG_HDRS_ALL)
2330	# define DBG_HDRS_ALL
2331	# endif
2332
2333	# if defined(POINTER_MASK) && !defined(POINTER_SHIFT)
2334	# define POINTER_SHIFT 0
2335	# endif
2336
2337	# if defined(POINTER_SHIFT) && !defined(POINTER_MASK)
2338	# define POINTER_MASK ((GC_word)(-1))
2339	# endif
2340
2341	# if !defined(FIXUP_POINTER) && defined(POINTER_MASK)
2342	# define FIXUP_POINTER(p) (p) = ((p) & (POINTER_MASK) << POINTER_SHIFT)
2343	# endif
2344
2345	# if defined(FIXUP_POINTER)
2346	# define NEED_FIXUP_POINTER 1
2347	# else
2348	# define NEED_FIXUP_POINTER 0
2349	# define FIXUP_POINTER(p)
2350	# endif
2351
2352	#ifdef GC_PRIVATE_H
2353	/* This relies on some type definitions from gc_priv.h, from */
2354	/* where it's normally included. */
2355	/* */
2356	/* How to get heap memory from the OS: */
2357	/* Note that sbrk()-like allocation is preferred, since it */
2358	/* usually makes it possible to merge consecutively allocated */
2359	/* chunks. It also avoids unintented recursion with */
2360	/* -DREDIRECT_MALLOC. */
2361	/* GET_MEM() returns a HLKSIZE aligned chunk. */
2362	/* 0 is taken to mean failure. */
2363	/* In the case os USE_MMAP, the argument must also be a */
2364	/* physical page size. */
2365	/* GET_MEM is currently not assumed to retrieve 0 filled space, */
2366	/* though we should perhaps take advantage of the case in which */
2367	/* does. */
2368	struct hblk; /* See gc_priv.h. */
2369	# ifdef PCR
2370	char * real_malloc();
2371	# define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \
2372	+ GC_page_size-1)
2373	# else
2374	# ifdef OS2
2375	void * os2_alloc(size_t bytes);
2376	# define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \
2377	+ GC_page_size) \
2378	+ GC_page_size-1)
2379	# else
2380	# if defined(NEXT) \|\| defined(DOS4GW) \|\| defined(NONSTOP) \|\| \
2381	(defined(AMIGA) && !defined(GC_AMIGA_FASTALLOC)) \|\| \
2382	(defined(SUNOS5) && !defined(USE_MMAP))
2383	# define GET_MEM(bytes) HBLKPTR((size_t) \
2384	calloc(1, (size_t)bytes + GC_page_size) \
2385	+ GC_page_size-1)
2386	# else
2387	# ifdef MSWIN32
2388	extern ptr_t GC_win32_get_mem();
2389	# define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
2390	# else
2391	# ifdef MACOS
2392	# if defined(USE_TEMPORARY_MEMORY)
2393	extern Ptr GC_MacTemporaryNewPtr(size_t size,
2394	Boolean clearMemory);
2395	# define GET_MEM(bytes) HBLKPTR( \
2396	GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \
2397	+ GC_page_size-1)
2398	# else
2399	# define GET_MEM(bytes) HBLKPTR( \
2400	NewPtrClear(bytes + GC_page_size) + GC_page_size-1)
2401	# endif
2402	# else
2403	# ifdef MSWINCE
2404	extern ptr_t GC_wince_get_mem();
2405	# define GET_MEM(bytes) (struct hblk *)GC_wince_get_mem(bytes)
2406	# else
2407	# if defined(AMIGA) && defined(GC_AMIGA_FASTALLOC)
2408	extern void *GC_amiga_get_mem(size_t size);
2409	# define GET_MEM(bytes) HBLKPTR((size_t) \
2410	GC_amiga_get_mem((size_t)bytes + GC_page_size) \
2411	+ GC_page_size-1)
2412	# else
2413	extern ptr_t GC_unix_get_mem();
2414	# define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
2415	# endif
2416	# endif
2417	# endif
2418	# endif
2419	# endif
2420	# endif
2421	# endif
2422
2423	#endif /* GC_PRIVATE_H */
2424
2425	#if defined(_AIX) && !defined(__GNUC__) && !defined(__STDC__)
2426	/* IBMs xlc compiler doesn't appear to follow the convention of */
2427	/* defining __STDC__ to be zero in extended mode. */
2428	# define __STDC__ 0
2429	#endif
2430
2431	# endif /* GCCONFIG_H */

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