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.
7 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
8 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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.
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
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 # include <stddef.h> /* For size_t etc. */
36 /* Machine dependent parameters. Some tuning parameters can be found */
37 /* near the top of gc_private.h. */
39 /* Machine specific parts contributed by various people. See README file. */
41 /* First a unified test for Linux: */
42 # if defined(linux) || defined(__linux__)
48 /* And one for NetBSD: */
49 # if defined(__NetBSD__)
53 /* And one for OpenBSD: */
54 # if defined(__OpenBSD__)
58 /* And one for FreeBSD: */
59 # if (defined(__FreeBSD__) || defined(__DragonFly__) || \
60 defined(__FreeBSD_kernel__)) && !defined(FREEBSD)
64 /* Determine the machine type: */
65 # if defined(__arm__) || defined(__thumb__)
67 # if !defined(LINUX) && !defined(NETBSD)
69 # define mach_type_known
72 # if defined(sun) && defined(mc68000)
73 # error SUNOS4 no longer supported
75 # if defined(hp9000s300)
76 # error M68K based HP machines no longer supported.
78 # if defined(OPENBSD) && defined(m68k)
80 # define mach_type_known
82 # if defined(OPENBSD) && defined(__sparc__)
84 # define mach_type_known
86 # if defined(NETBSD) && (defined(m68k) || defined(__m68k__))
88 # define mach_type_known
90 # if defined(NETBSD) && defined(__powerpc__)
92 # define mach_type_known
94 # if defined(NETBSD) && (defined(__arm32__) || defined(__arm__))
96 # define mach_type_known
98 # if defined(NETBSD) && defined(__sh__)
100 # define mach_type_known
109 # define mach_type_known
111 # if defined(__NetBSD__) && defined(__vax__)
113 # define mach_type_known
115 # if defined(mips) || defined(__mips) || defined(_mips)
117 # if defined(nec_ews) || defined(_nec_ews)
120 # if !defined(LINUX) && !defined(EWS4800) && !defined(NETBSD)
121 # if defined(ultrix) || defined(__ultrix)
124 # define IRIX5 /* or IRIX 6.X */
127 # if defined(__NetBSD__) && defined(__MIPSEL__)
130 # define mach_type_known
132 # if defined(DGUX) && (defined(i386) || defined(__i386__))
137 # define mach_type_known
139 # if defined(sequent) && (defined(i386) || defined(__i386__))
142 # define mach_type_known
144 # if defined(sun) && (defined(i386) || defined(__i386__))
147 # define mach_type_known
149 # if defined(sun) && defined(__amd64)
152 # define mach_type_known
154 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
157 # define mach_type_known
160 # error IBM PC/RT no longer supported.
162 # if defined(sun) && (defined(sparc) || defined(__sparc))
164 /* Test for SunOS 5.x */
167 # define mach_type_known
169 # if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
170 && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__FreeBSD__) \
171 && !defined(__DragonFly__)
174 # define mach_type_known
179 # define mach_type_known
181 # if defined(__NetBSD__) && defined(__sparc__)
183 # define mach_type_known
185 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
186 /* The above test may need refinement */
188 # if defined(_SCO_ELF)
193 # define mach_type_known
195 # if defined(_AUX_SOURCE)
196 # error A/UX no longer supported
198 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
199 || defined(hppa) || defined(__hppa__)
201 # if !defined(LINUX) && !defined(HPUX)
204 # define mach_type_known
206 # if defined(__ia64) && (defined(_HPUX_SOURCE) || defined(__HP_aCC))
211 # define mach_type_known
213 # if defined(__BEOS__) && defined(_X86_)
216 # define mach_type_known
218 # if defined(LINUX) && (defined(i386) || defined(__i386__))
220 # define mach_type_known
222 # if defined(LINUX) && defined(__x86_64__)
224 # define mach_type_known
226 # if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
228 # define mach_type_known
230 # if defined(LINUX) && defined(__arm__)
232 # define mach_type_known
234 # if defined(LINUX) && defined(__cris__)
238 # define mach_type_known
240 # if defined(LINUX) && (defined(powerpc) || defined(__powerpc__) || \
241 defined(powerpc64) || defined(__powerpc64__))
243 # define mach_type_known
245 # if defined(FREEBSD) && (defined(powerpc) || defined(__powerpc__))
247 # define mach_type_known
249 # if defined(LINUX) && defined(__mc68000__)
251 # define mach_type_known
253 # if defined(LINUX) && (defined(sparc) || defined(__sparc__))
255 # define mach_type_known
257 # if defined(LINUX) && defined(__arm__)
259 # define mach_type_known
261 # if defined(LINUX) && defined(__sh__)
263 # define mach_type_known
265 # if defined(LINUX) && defined(__m32r__)
267 # define mach_type_known
269 # if defined(__alpha) || defined(__alpha__)
271 # if !defined(LINUX) && !defined(NETBSD) && !defined(OPENBSD) && !defined(FREEBSD)
272 # define OSF1 /* a.k.a Digital Unix */
274 # define mach_type_known
276 # if defined(_AMIGA) && !defined(AMIGA)
281 # define mach_type_known
283 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
286 # define mach_type_known
288 # if defined(__MWERKS__) && defined(__powerc) && !defined(__MACH__)
291 # define mach_type_known
293 # if defined(macosx) || (defined(__APPLE__) && defined(__MACH__))
295 # if defined(__ppc__) || defined(__ppc64__)
297 # define mach_type_known
298 # elif defined(__x86_64__)
300 # define mach_type_known
301 # elif defined(__i386__)
303 # define mach_type_known
306 # if defined(NeXT) && defined(mc68000)
309 # define mach_type_known
311 # if defined(NeXT) && (defined(i386) || defined(__i386__))
314 # define mach_type_known
316 # if defined(__OpenBSD__) && (defined(i386) || defined(__i386__))
319 # define mach_type_known
321 # if defined(FREEBSD) && (defined(i386) || defined(__i386__))
323 # define mach_type_known
325 # if defined(FREEBSD) && defined(__x86_64__)
327 # define mach_type_known
329 # if defined(__NetBSD__) && (defined(i386) || defined(__i386__))
331 # define mach_type_known
333 # if defined(__NetBSD__) && defined(__x86_64__)
335 # define mach_type_known
337 # if defined(FREEBSD) && defined(__sparc__)
339 # define mach_type_known
341 # if defined(bsdi) && (defined(i386) || defined(__i386__))
344 # define mach_type_known
346 # if !defined(mach_type_known) && defined(__386BSD__)
349 # define mach_type_known
351 # if defined(_CX_UX) && defined(_M88K)
354 # define mach_type_known
356 # if defined(DGUX) && defined(m88k)
359 # define mach_type_known
361 # if defined(_WIN32_WCE)
362 /* SH3, SH4, MIPS already defined for corresponding architectures */
363 # if defined(SH3) || defined(SH4)
373 # define mach_type_known
375 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
376 || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
377 # if defined(__LP64__) || defined(_WIN64)
382 # define MSWIN32 /* or Win64 */
383 # define mach_type_known
385 # if defined(_MSC_VER) && defined(_M_IA64)
387 # define MSWIN32 /* Really win64, but we don't treat 64-bit */
388 /* variants as a differnt platform. */
391 # if defined(__DJGPP__)
394 # define DJGPP /* MSDOS running the DJGPP port of GCC */
396 # define mach_type_known
398 # if defined(__CYGWIN32__) || defined(__CYGWIN__)
401 # define mach_type_known
403 # if defined(__MINGW32__)
406 # define mach_type_known
408 # if defined(__BORLANDC__)
411 # define mach_type_known
413 # if defined(_UTS) && !defined(mach_type_known)
416 # define mach_type_known
419 # error PicoJava no longer supported
420 /* The implementation had problems, and I haven't heard of users */
421 /* in ages. If you want it resurrected, let me know. */
423 # if defined(__embedded__) && defined(PPC)
426 # define mach_type_known
429 # if defined(__WATCOMC__) && defined(__386__)
431 # if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
432 # if defined(__OS2__)
435 # if defined(__WINDOWS_386__) || defined(__NT__)
442 # define mach_type_known
444 # if defined(__s390__) && defined(LINUX)
446 # define mach_type_known
448 # if defined(__GNU__)
449 # if defined(__i386__)
450 /* The Debian Hurd running on generic PC */
453 # define mach_type_known
456 # if defined(__TANDEM)
457 /* Nonstop S-series */
458 /* FIXME: Should recognize Integrity series? */
461 # define mach_type_known
464 /* Feel free to add more clauses here */
466 /* Or manually define the machine type here. A machine type is */
467 /* characterized by the architecture. Some */
468 /* machine types are further subdivided by OS. */
469 /* Macros such as LINUX, FREEBSD, etc. distinguish them. */
470 /* SYSV on an M68K actually means A/UX. */
471 /* The distinction in these cases is usually the stack starting address */
472 # ifndef mach_type_known
473 # error "The collector has not been ported to this machine/OS combination."
475 /* Mapping is: M68K ==> Motorola 680X0 */
476 /* (NEXT, and SYSV (A/UX), */
477 /* MACOS and AMIGA variants) */
478 /* I386 ==> Intel 386 */
479 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
480 /* FREEBSD, THREE86BSD, MSWIN32, */
481 /* BSDI,SOLARIS, NEXT, other variants) */
482 /* NS32K ==> Encore Multimax */
483 /* MIPS ==> R2000 through R14K */
484 /* (many variants) */
485 /* VAX ==> DEC VAX */
486 /* (BSD, ULTRIX variants) */
487 /* HP_PA ==> HP9000/700 & /800 */
489 /* SPARC ==> SPARC v7/v8/v9 */
490 /* (SOLARIS, LINUX, DRSNX variants) */
491 /* ALPHA ==> DEC Alpha */
492 /* (OSF1 and LINUX variants) */
493 /* M88K ==> Motorola 88XX0 */
494 /* (CX_UX and DGUX) */
495 /* S370 ==> 370-like machine */
496 /* running Amdahl UTS4 */
497 /* S390 ==> 390-like machine */
499 /* ARM32 ==> Intel StrongARM */
500 /* IA64 ==> Intel IPF */
502 /* (LINUX and HPUX) */
503 /* SH ==> Hitachi SuperH */
504 /* (LINUX & MSWINCE) */
505 /* X86_64 ==> AMD x86-64 */
506 /* POWERPC ==> IBM/Apple PowerPC */
507 /* (MACOS(<=9),DARWIN(incl.MACOSX),*/
508 /* LINUX, NETBSD, AIX, NOSYS */
510 /* Handles 32 and 64-bit variants. */
511 /* CRIS ==> Axis Etrax */
512 /* M32R ==> Renesas M32R */
516 * For each architecture and OS, the following need to be defined:
518 * CPP_WORDSZ is a simple integer constant representing the word size.
519 * in bits. We assume byte addressibility, where a byte has 8 bits.
520 * We also assume CPP_WORDSZ is either 32 or 64.
521 * (We care about the length of pointers, not hardware
522 * bus widths. Thus a 64 bit processor with a C compiler that uses
523 * 32 bit pointers should use CPP_WORDSZ of 32, not 64. Default is 32.)
525 * MACH_TYPE is a string representation of the machine type.
526 * OS_TYPE is analogous for the OS.
528 * ALIGNMENT is the largest N, such that
529 * all pointer are guaranteed to be aligned on N byte boundaries.
530 * defining it to be 1 will always work, but perform poorly.
532 * DATASTART is the beginning of the data segment.
533 * On some platforms SEARCH_FOR_DATA_START is defined.
534 * SEARCH_FOR_DATASTART will cause GC_data_start to
535 * be set to an address determined by accessing data backwards from _end
536 * until an unmapped page is found. DATASTART will be defined to be
538 * On UNIX-like systems, the collector will scan the area between DATASTART
539 * and DATAEND for root pointers.
541 * DATAEND, if not `end' where `end' is defined as ``extern int end[];''.
542 * RTH suggests gaining access to linker script synth'd values with
543 * this idiom instead of `&end' where `end' is defined as ``extern int end;'' .
544 * Otherwise, ``GCC will assume these are in .sdata/.sbss'' and it will, e.g.,
545 * cause failures on alpha*-*-* with ``-msmall-data or -fpic'' or mips-*-*
546 * without any special options.
548 * STACKBOTTOM is the cool end of the stack, which is usually the
549 * highest address in the stack.
550 * Under PCR or OS/2, we have other ways of finding thread stacks.
551 * For each machine, the following should:
552 * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
553 * 2) define exactly one of
554 * STACKBOTTOM (should be defined to be an expression)
558 * If STACKBOTTOM is defined, then it's value will be used directly as the
559 * stack base. If LINUX_STACKBOTTOM is defined, then it will be determined
560 * with a method appropriate for most Linux systems. Currently we look
561 * first for __libc_stack_end (currently only id USE_LIBC_PRIVATES is
562 * defined), and if that fails read it from /proc. (If USE_LIBC_PRIVATES
563 * is not defined and NO_PROC_STAT is defined, we revert to HEURISTIC2.)
564 * If either of the last two macros are defined, then STACKBOTTOM is computed
565 * during collector startup using one of the following two heuristics:
566 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
567 * the next multiple of STACK_GRAN.
568 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
569 * in small steps (decrement if STACK_GROWS_UP), and read the value
570 * at each location. Remember the value when the first
571 * Segmentation violation or Bus error is signalled. Round that
572 * to the nearest plausible page boundary, and use that instead
575 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
576 * the value of environ is a pointer that can serve as STACKBOTTOM.
577 * I expect that HEURISTIC2 can be replaced by this approach, which
578 * interferes far less with debugging. However it has the disadvantage
579 * that it's confused by a putenv call before the collector is initialized.
580 * This could be dealt with by intercepting putenv ...
582 * If no expression for STACKBOTTOM can be found, and neither of the above
583 * heuristics are usable, the collector can still be used with all of the above
584 * undefined, provided one of the following is done:
585 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
586 * without reference to STACKBOTTOM. This is appropriate for use in
587 * conjunction with thread packages, since there will be multiple stacks.
588 * (Allocating thread stacks in the heap, and treating them as ordinary
589 * heap data objects is also possible as a last resort. However, this is
590 * likely to introduce significant amounts of excess storage retention
591 * unless the dead parts of the thread stacks are periodically cleared.)
592 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
593 * If the author of the client code controls the main program, this is
594 * easily accomplished by introducing a new main program, setting
595 * GC_stackbottom to the address of a local variable, and then calling
596 * the original main program. The new main program would read something
599 * # include "gc_private.h"
601 * main(argc, argv, envp)
603 * char **argv, **envp;
607 * GC_stackbottom = (ptr_t)(&dummy);
608 * return(real_main(argc, argv, envp));
612 * Each architecture may also define the style of virtual dirty bit
613 * implementation to be used:
614 * MPROTECT_VDB: Write protect the heap and catch faults.
615 * GWW_VDB: Use win32 GetWriteWatch primitive.
616 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
618 * The first and second one may be combined, in which case a runtime
619 * selection will be made, based on GetWriteWatch availability.
621 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
622 * defined GC_register_dynamic_libraries() for the architecture.
624 * An architecture may define PREFETCH(x) to preload the cache with *x.
625 * This defaults to a no-op.
627 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
629 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
630 * clear the two words at GC_malloc-aligned address x. By default,
631 * word stores of 0 are used instead.
633 * HEAP_START may be defined as the initial address hint for mmap-based
637 /* If we are using a recent version of gcc, we can use __builtin_unwind_init()
638 * to push the relevant registers onto the stack.
640 # if defined(__GNUC__) && ((__GNUC__ >= 3) || \
641 (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)) \
642 && !defined(__INTEL_COMPILER) && !defined(__PATHCC__)
643 # define HAVE_BUILTIN_UNWIND_INIT
646 # define STACK_GRAN 0x1000000
648 # define MACH_TYPE "M68K"
651 # define OS_TYPE "OPENBSD"
654 # define DATASTART GC_data_start
655 # define DYNAMIC_LOADING
658 # define DATASTART ((ptr_t)(etext))
662 # define OS_TYPE "NETBSD"
665 # define DATASTART GC_data_start
666 # define DYNAMIC_LOADING
669 # define DATASTART ((ptr_t)(etext))
673 # define OS_TYPE "LINUX"
674 # define LINUX_STACKBOTTOM
675 # define MPROTECT_VDB
677 # define DYNAMIC_LOADING
678 # include <features.h>
679 # if defined(__GLIBC__)&& __GLIBC__>=2
680 # define SEARCH_FOR_DATA_START
682 extern char **__environ;
683 # define DATASTART ((ptr_t)(&__environ))
684 /* hideous kludge: __environ is the first */
685 /* word in crt0.o, and delimits the start */
686 /* of the data segment, no matter which */
687 /* ld options were passed through. */
688 /* We could use _etext instead, but that */
689 /* would include .rodata, which may */
690 /* contain large read-only data tables */
691 /* that we'd rather not scan. */
692 # endif /* !GLIBC2 */
694 # define DATAEND (_end)
697 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
701 # define OS_TYPE "AMIGA"
702 /* STACKBOTTOM and DATASTART handled specially */
704 # define DATAEND /* not needed */
705 # define GETPAGESIZE() 4096
711 # define OS_TYPE "MACOS"
712 /* see os_dep.c for details of global data segments. */
713 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
714 # define DATAEND /* not needed */
715 # define GETPAGESIZE() 4096
718 # define OS_TYPE "NEXT"
719 # define DATASTART ((ptr_t) get_etext())
720 # define STACKBOTTOM ((ptr_t) 0x4000000)
721 # define DATAEND /* not needed */
725 # if defined(POWERPC)
726 # define MACH_TYPE "POWERPC"
728 # define ALIGNMENT 2 /* Still necessary? Could it be 4? */
732 # define OS_TYPE "MACOS"
733 /* see os_dep.c for details of global data segments. */
734 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
735 # define DATAEND /* not needed */
738 # if defined(__powerpc64__)
740 # define CPP_WORDSZ 64
742 # define HBLKSIZE 4096
747 # define OS_TYPE "LINUX"
748 /* HEURISTIC1 has been reliably reported to fail for a 32-bit */
749 /* executable on a 64 bit kernel. */
750 # define LINUX_STACKBOTTOM
751 # define DYNAMIC_LOADING
752 # define SEARCH_FOR_DATA_START
754 # define DATAEND (_end)
757 # define OS_TYPE "DARWIN"
758 # define DYNAMIC_LOADING
759 # if defined(__ppc64__)
761 # define CPP_WORDSZ 64
762 # define STACKBOTTOM ((ptr_t) 0x7fff5fc00000)
763 # define CACHE_LINE_SIZE 64
765 # define HBLKSIZE 4096
769 # define STACKBOTTOM ((ptr_t) 0xc0000000)
771 /* XXX: see get_end(3), get_etext() and get_end() should not be used.
772 These aren't used when dyld support is enabled (it is by default) */
773 # define DATASTART ((ptr_t) get_etext())
774 # define DATAEND ((ptr_t) get_end())
776 # define USE_MMAP_ANON
777 # ifdef GC_DARWIN_THREADS
778 # define MPROTECT_VDB
781 # define GETPAGESIZE() getpagesize()
782 # if defined(USE_PPC_PREFETCH) && defined(__GNUC__)
783 /* The performance impact of prefetches is untested */
784 # define PREFETCH(x) \
785 __asm__ __volatile__ ("dcbt 0,%0" : : "r" ((const void *) (x)))
786 # define PREFETCH_FOR_WRITE(x) \
787 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" ((const void *) (x)))
789 /* There seems to be some issues with trylock hanging on darwin. This
790 should be looked into some more */
791 # define NO_PTHREAD_TRYLOCK
795 # define OS_TYPE "FREEBSD"
796 # ifndef GC_FREEBSD_THREADS
797 # define MPROTECT_VDB
799 # define SIG_SUSPEND SIGUSR1
800 # define SIG_THR_RESTART SIGUSR2
801 # define FREEBSD_STACKBOTTOM
803 # define DYNAMIC_LOADING
806 extern char * GC_FreeBSDGetDataStart();
807 # define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
811 # define OS_TYPE "NETBSD"
814 # define DATASTART GC_data_start
815 # define DYNAMIC_LOADING
818 # define OS_TYPE "AIX"
819 # undef ALIGNMENT /* in case it's defined */
822 /* DOB: some AIX installs stupidly define IA64 in */
823 /* /usr/include/sys/systemcfg.h */
827 # define CPP_WORDSZ 64
828 # define STACKBOTTOM ((ptr_t)0x1000000000000000)
831 # define CPP_WORDSZ 32
832 # define STACKBOTTOM ((ptr_t)((ulong)&errno))
835 # define USE_MMAP_ANON
836 /* From AIX linker man page:
837 _text Specifies the first location of the program.
838 _etext Specifies the first location after the program.
839 _data Specifies the first location of the data.
840 _edata Specifies the first location after the initialized data
841 _end or end Specifies the first location after all data.
843 extern int _data[], _end[];
844 # define DATASTART ((ptr_t)((ulong)_data))
845 # define DATAEND ((ptr_t)((ulong)_end))
847 # define DYNAMIC_LOADING
848 /* For really old versions of AIX, this may have to be removed. */
853 # define OS_TYPE "NOSYS"
854 extern void __end[], __dso_handle[];
855 # define DATASTART (__dso_handle) /* OK, that's ugly. */
856 # define DATAEND (__end)
857 /* Stack starts at 0xE0000000 for the simulator. */
859 # define STACK_GRAN 0x10000000
865 # define MACH_TYPE "VAX"
866 # define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
868 # define DATASTART ((ptr_t)(etext))
870 # define OS_TYPE "BSD"
872 /* HEURISTIC2 may be OK, but it's hard to test. */
875 # define OS_TYPE "ULTRIX"
876 # define STACKBOTTOM ((ptr_t) 0x7fffc800)
881 # define MACH_TYPE "SPARC"
882 # if defined(__arch64__) || defined(__sparcv9)
884 # define CPP_WORDSZ 64
885 # define ELF_CLASS ELFCLASS64
887 # define ALIGNMENT 4 /* Required by hardware */
888 # define CPP_WORDSZ 32
890 /* Don't define USE_ASM_PUSH_REGS. We do use an asm helper, but */
891 /* not to push the registers on the mark stack. */
893 # define OS_TYPE "SOLARIS"
896 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
897 # define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)_etext)
898 # define DATAEND (_end)
899 # if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
901 /* Otherwise we now use calloc. Mmap may result in the */
902 /* heap interleaved with thread stacks, which can result in */
903 /* excessive blacklisting. Sbrk is unusable since it */
904 /* doesn't interact correctly with the system malloc. */
907 # define HEAP_START (ptr_t)0x40000000
909 # define HEAP_START DATAEND
912 /* HEURISTIC1 reportedly no longer works under 2.7. */
913 /* HEURISTIC2 probably works, but this appears to be preferable. */
914 /* Apparently USRSTACK is defined to be USERLIMIT, but in some */
915 /* installations that's undefined. We work around this with a */
917 # include <sys/vmparam.h>
919 /* This should work everywhere, but doesn't. */
920 # define STACKBOTTOM USRSTACK
925 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
926 /* getpagesize() appeared to be missing from at least one */
927 /* Solaris 5.4 installation. Weird. */
928 # define DYNAMIC_LOADING
931 # define OS_TYPE "DRSNX"
932 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
934 # define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)etext)
935 # define MPROTECT_VDB
936 # define STACKBOTTOM ((ptr_t) 0xdfff0000)
937 # define DYNAMIC_LOADING
940 # define OS_TYPE "LINUX"
942 # define DYNAMIC_LOADING
944 Linux Sparc/a.out not supported
948 # define DATAEND (_end)
950 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
952 # define DATASTART GC_SysVGetDataStart(0x100000, (ptr_t)_etext)
954 # define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)_etext)
956 # define LINUX_STACKBOTTOM
959 # define OS_TYPE "OPENBSD"
960 # define STACKBOTTOM ((ptr_t) 0xf8000000)
962 # define DATASTART ((ptr_t)(etext))
965 # define OS_TYPE "NETBSD"
968 # define DATASTART GC_data_start
969 # define DYNAMIC_LOADING
972 # define DATASTART ((ptr_t)(etext))
976 # define OS_TYPE "FREEBSD"
977 # define SIG_SUSPEND SIGUSR1
978 # define SIG_THR_RESTART SIGUSR2
979 # define FREEBSD_STACKBOTTOM
981 # define DYNAMIC_LOADING
986 # define NEED_FIND_LIMIT
987 # define DATASTART ((ptr_t)(&etext))
988 # define DATAEND (GC_find_limit (DATASTART, TRUE))
989 # define DATASTART2 ((ptr_t)(&edata))
990 # define DATAEND2 ((ptr_t)(&end))
995 # define MACH_TYPE "I386"
996 # if defined(__LP64__) || defined(_WIN64)
997 # error This should be handled as X86_64
999 # define CPP_WORDSZ 32
1000 # define ALIGNMENT 4
1001 /* Appears to hold for all "32 bit" compilers */
1002 /* except Borland. The -a4 option fixes */
1004 /* Ivan Demakov: For Watcom the option is -zp4. */
1007 # define OS_TYPE "SEQUENT"
1009 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1010 # define STACKBOTTOM ((ptr_t) 0x3ffff000)
1013 # define OS_TYPE "BEOS"
1015 # define GETPAGESIZE() B_PAGE_SIZE
1017 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1020 # define OS_TYPE "SOLARIS"
1021 extern int _etext[], _end[];
1022 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
1023 # define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
1024 # define DATAEND (_end)
1025 /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
1026 /* but reportedly breaks under 2.8. It appears that the stack */
1027 /* base is a property of the executable, so this should not break */
1028 /* old executables. */
1029 /* HEURISTIC2 probably works, but this appears to be preferable. */
1030 # include <sys/vm.h>
1031 # define STACKBOTTOM USRSTACK
1032 /* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
1033 /* It appears to be fixed in 2.8 and 2.9. */
1034 # ifdef SOLARIS25_PROC_VDB_BUG_FIXED
1037 # define DYNAMIC_LOADING
1038 # if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
1040 /* Otherwise we now use calloc. Mmap may result in the */
1041 /* heap interleaved with thread stacks, which can result in */
1042 /* excessive blacklisting. Sbrk is unusable since it */
1043 /* doesn't interact correctly with the system malloc. */
1046 # define HEAP_START (ptr_t)0x40000000
1048 # define HEAP_START DATAEND
1052 # define OS_TYPE "SCO"
1054 # define DATASTART ((ptr_t)((((word) (etext)) + 0x3fffff) \
1056 +((word)etext & 0xfff))
1057 # define STACKBOTTOM ((ptr_t) 0x7ffffffc)
1060 # define OS_TYPE "SCO_ELF"
1062 # define DATASTART ((ptr_t)(etext))
1063 # define STACKBOTTOM ((ptr_t) 0x08048000)
1064 # define DYNAMIC_LOADING
1065 # define ELF_CLASS ELFCLASS32
1068 # define OS_TYPE "DGUX"
1069 extern int _etext, _end;
1070 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
1071 # define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)(&_etext))
1072 # define DATAEND (&_end)
1073 # define STACK_GROWS_DOWN
1075 # include <unistd.h>
1076 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1077 # define DYNAMIC_LOADING
1080 # endif /* USE_MMAP */
1081 # define MAP_FAILED (void *) -1
1083 # define HEAP_START (ptr_t)0x40000000
1084 # else /* USE_MMAP */
1085 # define HEAP_START DATAEND
1086 # endif /* USE_MMAP */
1090 # define OS_TYPE "LINUX"
1091 # define LINUX_STACKBOTTOM
1095 # define STACK_GRAN 0x10000000
1096 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
1097 /* different kernel configurations. In particular, systems */
1098 /* with 2GB physical memory will usually move the user */
1099 /* address space limit, and hence initial SP to 0x80000000. */
1101 # if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
1102 # define MPROTECT_VDB
1104 /* We seem to get random errors in incremental mode, */
1105 /* possibly because Linux threads is itself a malloc client */
1106 /* and can't deal with the signals. */
1108 # define HEAP_START (ptr_t)0x1000
1109 /* This encourages mmap to give us low addresses, */
1110 /* thus allowing the heap to grow to ~3GB */
1112 # define DYNAMIC_LOADING
1113 # ifdef UNDEFINED /* includes ro data */
1114 extern int _etext[];
1115 # define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
1117 # include <features.h>
1118 # if defined(__GLIBC__) && __GLIBC__ >= 2
1119 # define SEARCH_FOR_DATA_START
1121 extern char **__environ;
1122 # define DATASTART ((ptr_t)(&__environ))
1123 /* hideous kludge: __environ is the first */
1124 /* word in crt0.o, and delimits the start */
1125 /* of the data segment, no matter which */
1126 /* ld options were passed through. */
1127 /* We could use _etext instead, but that */
1128 /* would include .rodata, which may */
1129 /* contain large read-only data tables */
1130 /* that we'd rather not scan. */
1133 # define DATAEND (_end)
1136 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1138 # ifdef USE_I686_PREFETCH
1139 /* FIXME: Thus should use __builtin_prefetch, but we'll leave that */
1140 /* for the next rtelease. */
1141 # define PREFETCH(x) \
1142 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
1143 /* Empirically prefetcht0 is much more effective at reducing */
1144 /* cache miss stalls for the targetted load instructions. But it */
1145 /* seems to interfere enough with other cache traffic that the net */
1146 /* result is worse than prefetchnta. */
1148 /* Using prefetches for write seems to have a slight negative */
1149 /* impact on performance, at least for a PIII/500. */
1150 # define PREFETCH_FOR_WRITE(x) \
1151 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
1154 # ifdef USE_3DNOW_PREFETCH
1155 # define PREFETCH(x) \
1156 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
1157 # define PREFETCH_FOR_WRITE(x) \
1158 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
1162 # define OS_TYPE "CYGWIN32"
1163 # define DATASTART ((ptr_t)GC_DATASTART) /* From gc.h */
1164 # define DATAEND ((ptr_t)GC_DATAEND)
1166 # define STACK_GRAN 0x10000
1170 # define OS_TYPE "OS2"
1171 /* STACKBOTTOM and DATASTART are handled specially in */
1172 /* os_dep.c. OS2 actually has the right */
1174 # define DATAEND /* not needed */
1177 # define OS_TYPE "MSWIN32"
1178 /* STACKBOTTOM and DATASTART are handled specially in */
1180 # if !defined(__WATCOMC__)
1181 # define MPROTECT_VDB
1182 /* We also avoided doing this in the past with GC_WIN32_THREADS */
1183 /* Hopefully that's fixed. */
1185 # if _MSC_VER >= 1300 /* .NET, i.e. > VisualStudio 6 */
1188 # define DATAEND /* not needed */
1191 # define OS_TYPE "MSWINCE"
1192 # define DATAEND /* not needed */
1195 # define OS_TYPE "DJGPP"
1196 # include "stubinfo.h"
1199 extern int __djgpp_stack_limit;
1200 # define DATASTART ((ptr_t)((((word) (etext)) + 0x1ff) & ~0x1ff))
1201 /* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
1203 # define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
1204 /* This may not be right. */
1207 # define OS_TYPE "OPENBSD"
1210 # define OS_TYPE "FREEBSD"
1211 # ifndef GC_FREEBSD_THREADS
1212 # define MPROTECT_VDB
1215 # define SIG_SUSPEND (32+6)
1216 # define SIG_THR_RESTART (32+5)
1218 # define DATAEND (_end)
1220 # define SIG_SUSPEND SIGUSR1
1221 # define SIG_THR_RESTART SIGUSR2
1223 # define FREEBSD_STACKBOTTOM
1225 # define DYNAMIC_LOADING
1227 extern char etext[];
1228 extern char * GC_FreeBSDGetDataStart(size_t, ptr_t);
1229 # define DATASTART GC_FreeBSDGetDataStart(0x1000, (ptr_t)etext)
1232 # define OS_TYPE "NETBSD"
1234 # define DYNAMIC_LOADING
1238 # define OS_TYPE "THREE86BSD"
1241 # define OS_TYPE "BSDI"
1243 # if defined(OPENBSD) || defined(NETBSD) \
1244 || defined(THREE86BSD) || defined(BSDI)
1246 extern char etext[];
1247 # define DATASTART ((ptr_t)(etext))
1250 # define OS_TYPE "NEXT"
1251 # define DATASTART ((ptr_t) get_etext())
1252 # define STACKBOTTOM ((ptr_t)0xc0000000)
1253 # define DATAEND /* not needed */
1256 # define OS_TYPE "DOS4GW"
1257 extern long __nullarea;
1259 extern char *_STACKTOP;
1260 /* Depending on calling conventions Watcom C either precedes
1261 or does not precedes with undescore names of C-variables.
1262 Make sure startup code variables always have the same names. */
1263 #pragma aux __nullarea "*";
1264 #pragma aux _end "*";
1265 # define STACKBOTTOM ((ptr_t) _STACKTOP)
1266 /* confused? me too. */
1267 # define DATASTART ((ptr_t) &__nullarea)
1268 # define DATAEND ((ptr_t) &_end)
1271 # define OS_TYPE "HURD"
1272 # define STACK_GROWS_DOWN
1274 # define SIG_SUSPEND SIGUSR1
1275 # define SIG_THR_RESTART SIGUSR2
1276 # define SEARCH_FOR_DATA_START
1278 # define DATAEND ((ptr_t) (_end))
1279 /* # define MPROTECT_VDB Not quite working yet? */
1280 # define DYNAMIC_LOADING
1283 # define OS_TYPE "DARWIN"
1284 # define DARWIN_DONT_PARSE_STACK
1285 # define DYNAMIC_LOADING
1286 /* XXX: see get_end(3), get_etext() and get_end() should not be used.
1287 These aren't used when dyld support is enabled (it is by default) */
1288 # define DATASTART ((ptr_t) get_etext())
1289 # define DATAEND ((ptr_t) get_end())
1290 # define STACKBOTTOM ((ptr_t) 0xc0000000)
1292 # define USE_MMAP_ANON
1293 # ifdef GC_DARWIN_THREADS
1294 # define MPROTECT_VDB
1296 # include <unistd.h>
1297 # define GETPAGESIZE() getpagesize()
1298 /* There seems to be some issues with trylock hanging on darwin. This
1299 should be looked into some more */
1300 # define NO_PTHREAD_TRYLOCK
1301 # endif /* DARWIN */
1305 # define MACH_TYPE "NS32K"
1306 # define ALIGNMENT 4
1307 extern char **environ;
1308 # define DATASTART ((ptr_t)(&environ))
1309 /* hideous kludge: environ is the first */
1310 /* word in crt0.o, and delimits the start */
1311 /* of the data segment, no matter which */
1312 /* ld options were passed through. */
1313 # define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
1317 # define MACH_TYPE "MIPS"
1319 /* This was developed for a linuxce style platform. Probably */
1320 /* needs to be tweaked for workstation class machines. */
1321 # define OS_TYPE "LINUX"
1322 # define DYNAMIC_LOADING
1324 # define DATAEND (_end)
1325 extern int __data_start[];
1326 # define DATASTART ((ptr_t)(__data_start))
1328 # define CPP_WORDSZ _MIPS_SZPTR
1329 # define ALIGNMENT (_MIPS_SZPTR/8)
1331 # define ALIGNMENT 4
1333 # if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2 || __GLIBC__ > 2
1334 # define LINUX_STACKBOTTOM
1336 # define STACKBOTTOM 0x80000000
1341 # if defined(_MIPS_SZPTR) && (_MIPS_SZPTR == 64)
1342 extern int _fdata[], _end[];
1343 # define DATASTART ((ptr_t)_fdata)
1344 # define DATAEND ((ptr_t)_end)
1345 # define CPP_WORDSZ _MIPS_SZPTR
1346 # define ALIGNMENT (_MIPS_SZPTR/8)
1348 extern int etext[], edata[], end[];
1349 extern int _DYNAMIC_LINKING[], _gp[];
1350 # define DATASTART ((ptr_t)((((word)etext + 0x3ffff) & ~0x3ffff) \
1351 + ((word)etext & 0xffff)))
1352 # define DATAEND (edata)
1353 # define DATASTART2 (_DYNAMIC_LINKING \
1354 ? (ptr_t)(((word)_gp + 0x8000 + 0x3ffff) & ~0x3ffff) \
1356 # define DATAEND2 (end)
1357 # define ALIGNMENT 4
1359 # define OS_TYPE "EWS4800"
1363 # define DATASTART (ptr_t)0x10000000
1364 /* Could probably be slightly higher since */
1365 /* startup code allocates lots of stuff. */
1366 # define OS_TYPE "ULTRIX"
1367 # define ALIGNMENT 4
1371 extern int _fdata[];
1372 # define DATASTART ((ptr_t)(_fdata))
1374 # define HEAP_START (ptr_t)0x30000000
1376 # define HEAP_START DATASTART
1378 /* Lowest plausible heap address. */
1379 /* In the MMAP case, we map there. */
1380 /* In either case it is used to identify */
1381 /* heap sections so they're not */
1382 /* considered as roots. */
1383 # define OS_TYPE "IRIX5"
1384 /*# define MPROTECT_VDB DOB: this should work, but there is evidence */
1385 /* of recent breakage. */
1387 # define CPP_WORDSZ _MIPS_SZPTR
1388 # define ALIGNMENT (_MIPS_SZPTR/8)
1390 # define ALIGNMENT 4
1392 # define DYNAMIC_LOADING
1395 # define OS_TYPE "MSWINCE"
1396 # define ALIGNMENT 4
1397 # define DATAEND /* not needed */
1399 # if defined(NETBSD)
1400 # define OS_TYPE "NETBSD"
1401 # define ALIGNMENT 4
1405 # define DATASTART GC_data_start
1406 # define NEED_FIND_LIMIT
1407 # define DYNAMIC_LOADING
1409 # define DATASTART ((ptr_t) 0x10000000)
1410 # define STACKBOTTOM ((ptr_t) 0x7ffff000)
1413 # if defined(NONSTOP)
1414 # define CPP_WORDSZ 32
1415 # define OS_TYPE "NONSTOP"
1416 # define ALIGNMENT 4
1417 # define DATASTART ((ptr_t) 0x08000000)
1418 extern char **environ;
1419 # define DATAEND ((ptr_t)(environ - 0x10))
1420 # define STACKBOTTOM ((ptr_t) 0x4fffffff)
1425 # define MACH_TYPE "HP_PA"
1427 # define CPP_WORDSZ 64
1428 # define ALIGNMENT 8
1430 # define CPP_WORDSZ 32
1431 # define ALIGNMENT 4
1433 # if !defined(GC_HPUX_THREADS) && !defined(GC_LINUX_THREADS)
1434 # ifndef LINUX /* For now. */
1435 # define MPROTECT_VDB
1438 # ifdef PARALLEL_MARK
1439 # define USE_MARK_BYTES
1440 /* Minimize compare-and-swap usage. */
1443 # define STACK_GROWS_UP
1445 # define OS_TYPE "HPUX"
1446 extern int __data_start[];
1447 # define DATASTART ((ptr_t)(__data_start))
1449 /* The following appears to work for 7xx systems running HP/UX */
1450 /* 9.xx Furthermore, it might result in much faster */
1451 /* collections than HEURISTIC2, which may involve scanning */
1452 /* segments that directly precede the stack. It is not the */
1453 /* default, since it may not work on older machine/OS */
1454 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1456 # define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1458 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1459 /* to this. Note that the GC must be initialized before the */
1460 /* first putenv call. */
1461 extern char ** environ;
1462 # define STACKBOTTOM ((ptr_t)environ)
1464 # define DYNAMIC_LOADING
1465 # include <unistd.h>
1466 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1468 # define PREFETCH(x) { \
1469 register long addr = (long)(x); \
1470 (void) _asm ("LDW", 0, 0, addr, 0); \
1475 # define OS_TYPE "LINUX"
1476 # define LINUX_STACKBOTTOM
1477 # define DYNAMIC_LOADING
1478 # define SEARCH_FOR_DATA_START
1480 # define DATAEND (&_end)
1485 # define MACH_TYPE "ALPHA"
1486 # define ALIGNMENT 8
1487 # define CPP_WORDSZ 64
1489 # define OS_TYPE "NETBSD"
1491 # define DATASTART GC_data_start
1492 # define ELFCLASS32 32
1493 # define ELFCLASS64 64
1494 # define ELF_CLASS ELFCLASS64
1495 # define DYNAMIC_LOADING
1498 # define OS_TYPE "OPENBSD"
1500 # ifdef __ELF__ /* since OpenBSD/Alpha 2.9 */
1501 # define DATASTART GC_data_start
1502 # define ELFCLASS32 32
1503 # define ELFCLASS64 64
1504 # define ELF_CLASS ELFCLASS64
1505 # else /* ECOFF, until OpenBSD/Alpha 2.7 */
1506 # define DATASTART ((ptr_t) 0x140000000)
1510 # define OS_TYPE "FREEBSD"
1511 /* MPROTECT_VDB is not yet supported at all on FreeBSD/alpha. */
1512 # define SIG_SUSPEND SIGUSR1
1513 # define SIG_THR_RESTART SIGUSR2
1514 # define FREEBSD_STACKBOTTOM
1516 # define DYNAMIC_LOADING
1518 /* Handle unmapped hole alpha*-*-freebsd[45]* puts between etext and edata. */
1519 extern char etext[];
1520 extern char edata[];
1522 # define NEED_FIND_LIMIT
1523 # define DATASTART ((ptr_t)(&etext))
1524 # define DATAEND (GC_find_limit (DATASTART, TRUE))
1525 # define DATASTART2 ((ptr_t)(&edata))
1526 # define DATAEND2 ((ptr_t)(&end))
1529 # define OS_TYPE "OSF1"
1530 # define DATASTART ((ptr_t) 0x140000000)
1532 # define DATAEND ((ptr_t) &_end)
1533 extern char ** environ;
1534 /* round up from the value of environ to the nearest page boundary */
1535 /* Probably breaks if putenv is called before collector */
1536 /* initialization. */
1537 # define STACKBOTTOM ((ptr_t)(((word)(environ) | (getpagesize()-1))+1))
1538 /* # define HEURISTIC2 */
1539 /* Normally HEURISTIC2 is too conervative, since */
1540 /* the text segment immediately follows the stack. */
1541 /* Hence we give an upper pound. */
1542 /* This is currently unused, since we disabled HEURISTIC2 */
1543 extern int __start[];
1544 # define HEURISTIC2_LIMIT ((ptr_t)((word)(__start) & ~(getpagesize()-1)))
1545 # ifndef GC_OSF1_THREADS
1546 /* Unresolved signal issues with threads. */
1547 # define MPROTECT_VDB
1549 # define DYNAMIC_LOADING
1552 # define OS_TYPE "LINUX"
1553 # define LINUX_STACKBOTTOM
1555 # define SEARCH_FOR_DATA_START
1556 # define DYNAMIC_LOADING
1558 # define DATASTART ((ptr_t) 0x140000000)
1561 # define DATAEND (_end)
1562 # define MPROTECT_VDB
1563 /* Has only been superficially tested. May not */
1564 /* work on all versions. */
1569 # define MACH_TYPE "IA64"
1572 # define CPP_WORDSZ 32
1573 /* Requires 8 byte alignment for malloc */
1574 # define ALIGNMENT 4
1579 # define CPP_WORDSZ 64
1580 /* Requires 16 byte alignment for malloc */
1581 # define ALIGNMENT 8
1583 # define OS_TYPE "HPUX"
1584 extern int __data_start[];
1585 # define DATASTART ((ptr_t)(__data_start))
1586 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1587 /* to this. Note that the GC must be initialized before the */
1588 /* first putenv call. */
1589 extern char ** environ;
1590 # define STACKBOTTOM ((ptr_t)environ)
1591 # define HPUX_STACKBOTTOM
1592 # define DYNAMIC_LOADING
1593 # include <unistd.h>
1594 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1595 /* The following was empirically determined, and is probably */
1596 /* not very robust. */
1597 /* Note that the backing store base seems to be at a nice */
1598 /* address minus one page. */
1599 # define BACKING_STORE_DISPLACEMENT 0x1000000
1600 # define BACKING_STORE_ALIGNMENT 0x1000
1601 extern ptr_t GC_register_stackbottom;
1602 # define BACKING_STORE_BASE GC_register_stackbottom
1603 /* Known to be wrong for recent HP/UX versions!!! */
1606 # define CPP_WORDSZ 64
1607 # define ALIGNMENT 8
1608 # define OS_TYPE "LINUX"
1609 /* The following works on NUE and older kernels: */
1610 /* # define STACKBOTTOM ((ptr_t) 0xa000000000000000l) */
1611 /* This does not work on NUE: */
1612 # define LINUX_STACKBOTTOM
1613 /* We also need the base address of the register stack */
1614 /* backing store. This is computed in */
1615 /* GC_linux_register_stack_base based on the following */
1617 # define BACKING_STORE_ALIGNMENT 0x100000
1618 # define BACKING_STORE_DISPLACEMENT 0x80000000
1619 extern ptr_t GC_register_stackbottom;
1620 # define BACKING_STORE_BASE GC_register_stackbottom
1621 # define SEARCH_FOR_DATA_START
1623 # define DYNAMIC_LOADING
1625 /* In the Intel compiler environment, we seem to end up with */
1626 /* statically linked executables and an undefined reference */
1629 # define MPROTECT_VDB
1630 /* Requires Linux 2.3.47 or later. */
1632 # define DATAEND (_end)
1634 # ifndef __INTEL_COMPILER
1635 # define PREFETCH(x) \
1636 __asm__ (" lfetch [%0]": : "r"(x))
1637 # define PREFETCH_FOR_WRITE(x) \
1638 __asm__ (" lfetch.excl [%0]": : "r"(x))
1639 # define CLEAR_DOUBLE(x) \
1640 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1642 # include <ia64intrin.h>
1643 # define PREFETCH(x) \
1644 __lfetch(__lfhint_none, (x))
1645 # define PREFETCH_FOR_WRITE(x) \
1646 __lfetch(__lfhint_nta, (x))
1647 # define CLEAR_DOUBLE(x) \
1648 __stf_spill((void *)(x), 0)
1649 # endif /* __INTEL_COMPILER */
1653 /* FIXME: This is a very partial guess. There is no port, yet. */
1654 # define OS_TYPE "MSWIN32"
1655 /* STACKBOTTOM and DATASTART are handled specially in */
1657 # define DATAEND /* not needed */
1658 # if defined(_WIN64)
1659 # define CPP_WORDSZ 64
1661 # define CPP_WORDSZ 32 /* Is this possible? */
1663 # define ALIGNMENT 8
1664 # define STRTOULL _strtoui64
1669 # define MACH_TYPE "M88K"
1670 # define ALIGNMENT 4
1673 # define OS_TYPE "CX_UX"
1674 # define DATASTART ((((word)etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1677 # define OS_TYPE "DGUX"
1678 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
1679 # define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)etext)
1681 # define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1685 /* If this still works, and if anyone cares, this should probably */
1686 /* be moved to the S390 category. */
1687 # define MACH_TYPE "S370"
1688 # define ALIGNMENT 4 /* Required by hardware */
1690 # define OS_TYPE "UTS4"
1692 extern int _etext[];
1694 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
1695 # define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)_etext)
1696 # define DATAEND (_end)
1702 # define MACH_TYPE "S390"
1704 # define ALIGNMENT 4
1705 # define CPP_WORDSZ 32
1707 # define ALIGNMENT 8
1708 # define CPP_WORDSZ 64
1710 # define HBLKSIZE 4096
1714 # define OS_TYPE "LINUX"
1715 # define LINUX_STACKBOTTOM
1716 # define DYNAMIC_LOADING
1717 extern int __data_start[];
1718 # define DATASTART ((ptr_t)(__data_start))
1720 # define DATAEND (_end)
1721 # define CACHE_LINE_SIZE 256
1722 # define GETPAGESIZE() 4096
1727 # define CPP_WORDSZ 32
1728 # define MACH_TYPE "ARM32"
1729 # define ALIGNMENT 4
1731 # define OS_TYPE "NETBSD"
1734 # define DATASTART GC_data_start
1735 # define DYNAMIC_LOADING
1737 extern char etext[];
1738 # define DATASTART ((ptr_t)(etext))
1742 # define OS_TYPE "LINUX"
1743 # define LINUX_STACKBOTTOM
1745 # define STACK_GRAN 0x10000000
1747 # define DYNAMIC_LOADING
1748 # include <features.h>
1749 # if defined(__GLIBC__) && __GLIBC__ >= 2
1750 # define SEARCH_FOR_DATA_START
1752 extern char **__environ;
1753 # define DATASTART ((ptr_t)(&__environ))
1754 /* hideous kludge: __environ is the first */
1755 /* word in crt0.o, and delimits the start */
1756 /* of the data segment, no matter which */
1757 /* ld options were passed through. */
1758 /* We could use _etext instead, but that */
1759 /* would include .rodata, which may */
1760 /* contain large read-only data tables */
1761 /* that we'd rather not scan. */
1764 # define DATAEND (_end)
1767 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1771 # define OS_TYPE "MSWINCE"
1772 # define DATAEND /* not needed */
1775 /* __data_start is usually defined in the target linker script. */
1776 extern int __data_start[];
1777 # define DATASTART (ptr_t)(__data_start)
1778 /* __stack_base__ is set in newlib/libc/sys/arm/crt0.S */
1779 extern void *__stack_base__;
1780 # define STACKBOTTOM ((ptr_t) (__stack_base__))
1785 # define MACH_TYPE "CRIS"
1786 # define CPP_WORDSZ 32
1787 # define ALIGNMENT 1
1788 # define OS_TYPE "LINUX"
1789 # define DYNAMIC_LOADING
1790 # define LINUX_STACKBOTTOM
1791 # define SEARCH_FOR_DATA_START
1793 # define DATAEND (_end)
1797 # define MACH_TYPE "SH"
1798 # define ALIGNMENT 4
1800 # define OS_TYPE "MSWINCE"
1801 # define DATAEND /* not needed */
1804 # define OS_TYPE "LINUX"
1805 # define LINUX_STACKBOTTOM
1806 # define DYNAMIC_LOADING
1807 # define SEARCH_FOR_DATA_START
1809 # define DATAEND (_end)
1812 # define OS_TYPE "NETBSD"
1814 # define DATASTART GC_data_start
1815 # define DYNAMIC_LOADING
1820 # define MACH_TYPE "SH4"
1821 # define OS_TYPE "MSWINCE"
1822 # define ALIGNMENT 4
1823 # define DATAEND /* not needed */
1827 # define CPP_WORDSZ 32
1828 # define MACH_TYPE "M32R"
1829 # define ALIGNMENT 4
1831 # define OS_TYPE "LINUX"
1832 # define LINUX_STACKBOTTOM
1834 # define STACK_GRAN 0x10000000
1835 # define DYNAMIC_LOADING
1836 # define SEARCH_FOR_DATA_START
1838 # define DATAEND (_end)
1843 # define MACH_TYPE "X86_64"
1844 # define ALIGNMENT 8
1845 # define CPP_WORDSZ 64
1847 # define HBLKSIZE 4096
1849 # define CACHE_LINE_SIZE 64
1851 # define OS_TYPE "LINUX"
1852 # define LINUX_STACKBOTTOM
1853 # if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
1854 # define MPROTECT_VDB
1856 /* We seem to get random errors in incremental mode, */
1857 /* possibly because Linux threads is itself a malloc client */
1858 /* and can't deal with the signals. */
1861 # define DYNAMIC_LOADING
1862 # ifdef UNDEFINED /* includes ro data */
1863 extern int _etext[];
1864 # define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
1866 # include <features.h>
1867 # define SEARCH_FOR_DATA_START
1869 # define DATAEND (_end)
1872 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1874 # if defined(__GNUC__) && __GNUC__ >= 3
1875 # define PREFETCH(x) __builtin_prefetch((x), 0, 0)
1876 # define PREFETCH_FOR_WRITE(x) __builtin_prefetch((x), 1)
1880 # define OS_TYPE "DARWIN"
1881 # define DARWIN_DONT_PARSE_STACK
1882 # define DYNAMIC_LOADING
1883 /* XXX: see get_end(3), get_etext() and get_end() should not be used.
1884 These aren't used when dyld support is enabled (it is by default) */
1885 # define DATASTART ((ptr_t) get_etext())
1886 # define DATAEND ((ptr_t) get_end())
1887 # define STACKBOTTOM ((ptr_t) 0x7fff5fc00000)
1889 # define USE_MMAP_ANON
1890 # ifdef GC_DARWIN_THREADS
1891 # define MPROTECT_VDB
1893 # include <unistd.h>
1894 # define GETPAGESIZE() getpagesize()
1895 /* There seems to be some issues with trylock hanging on darwin. This
1896 should be looked into some more */
1897 # define NO_PTHREAD_TRYLOCK
1900 # define OS_TYPE "FREEBSD"
1901 # ifndef GC_FREEBSD_THREADS
1902 # define MPROTECT_VDB
1905 # define SIG_SUSPEND (32+6)
1906 # define SIG_THR_RESTART (32+5)
1908 # define DATAEND (_end)
1910 # define SIG_SUSPEND SIGUSR1
1911 # define SIG_THR_RESTART SIGUSR2
1913 # define FREEBSD_STACKBOTTOM
1915 # define DYNAMIC_LOADING
1917 extern char etext[];
1918 extern char * GC_FreeBSDGetDataStart();
1919 # define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
1922 # define OS_TYPE "NETBSD"
1924 # define DYNAMIC_LOADING
1927 extern char etext[];
1928 # define SEARCH_FOR_DATA_START
1931 # define OS_TYPE "SOLARIS"
1932 # define ELF_CLASS ELFCLASS64
1933 extern int _etext[], _end[];
1934 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
1935 # define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
1936 # define DATAEND (_end)
1937 /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
1938 /* but reportedly breaks under 2.8. It appears that the stack */
1939 /* base is a property of the executable, so this should not break */
1940 /* old executables. */
1941 /* HEURISTIC2 probably works, but this appears to be preferable. */
1942 /* Apparently USRSTACK is defined to be USERLIMIT, but in some */
1943 /* installations that's undefined. We work around this with a */
1945 # include <sys/vmparam.h>
1947 /* This should work everywhere, but doesn't. */
1948 # define STACKBOTTOM USRSTACK
1952 /* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
1953 /* It appears to be fixed in 2.8 and 2.9. */
1954 # ifdef SOLARIS25_PROC_VDB_BUG_FIXED
1957 # define DYNAMIC_LOADING
1958 # if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
1960 /* Otherwise we now use calloc. Mmap may result in the */
1961 /* heap interleaved with thread stacks, which can result in */
1962 /* excessive blacklisting. Sbrk is unusable since it */
1963 /* doesn't interact correctly with the system malloc. */
1966 # define HEAP_START (ptr_t)0x40000000
1968 # define HEAP_START DATAEND
1972 # define OS_TYPE "MSWIN32"
1973 /* STACKBOTTOM and DATASTART are handled specially in */
1975 # if !defined(__WATCOMC__)
1976 # define MPROTECT_VDB
1977 /* We also avoided doing this in the past with GC_WIN32_THREADS */
1978 /* Hopefully that's fixed. */
1980 # if _MSC_VER >= 1300 /* .NET, i.e. > VisualStudio 6 */
1983 # define DATAEND /* not needed */
1987 #if defined(LINUX_STACKBOTTOM) && defined(NO_PROC_STAT) \
1988 && !defined(USE_LIBC_PRIVATES)
1989 /* This combination will fail, since we have no way to get */
1990 /* the stack base. Use HEURISTIC2 instead. */
1991 # undef LINUX_STACKBOTTOM
1993 /* This may still fail on some architectures like IA64. */
1997 #if defined(LINUX) && defined(USE_MMAP)
1998 /* The kernel may do a somewhat better job merging mappings etc. */
1999 /* with anonymous mappings. */
2000 # define USE_MMAP_ANON
2003 #if defined(GC_LINUX_THREADS) && defined(REDIRECT_MALLOC)
2004 /* Nptl allocates thread stacks with mmap, which is fine. But it */
2005 /* keeps a cache of thread stacks. Thread stacks contain the */
2006 /* thread control blocks. These in turn contain a pointer to */
2007 /* (sizeof (void *) from the beginning of) the dtv for thread-local */
2008 /* storage, which is calloc allocated. If we don't scan the cached */
2009 /* thread stacks, we appear to lose the dtv. This tends to */
2010 /* result in something that looks like a bogus dtv count, which */
2011 /* tends to result in a memset call on a block that is way too */
2012 /* large. Sometimes we're lucky and the process just dies ... */
2013 /* There seems to be a similar issue with some other memory */
2014 /* allocated by the dynamic loader. */
2015 /* This should be avoidable by either: */
2016 /* - Defining USE_PROC_FOR_LIBRARIES here. */
2017 /* That performs very poorly, precisely because we end up */
2018 /* scanning cached stacks. */
2019 /* - Have calloc look at its callers. */
2020 /* In spite of the fact that it is gross and disgusting. */
2021 /* In fact neither seems to suffice, probably in part because */
2022 /* even with USE_PROC_FOR_LIBRARIES, we don't scan parts of stack */
2023 /* segments that appear to be out of bounds. Thus we actually */
2024 /* do both, which seems to yield the best results. */
2026 # define USE_PROC_FOR_LIBRARIES
2029 # ifndef STACK_GROWS_UP
2030 # define STACK_GROWS_DOWN
2034 # define CPP_WORDSZ 32
2043 # define DATAEND (end)
2046 # if defined(SVR4) && !defined(GETPAGESIZE)
2047 # include <unistd.h>
2048 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
2051 # ifndef GETPAGESIZE
2052 # if defined(SOLARIS) || defined(IRIX5) || defined(LINUX) \
2053 || defined(NETBSD) || defined(FREEBSD) || defined(HPUX)
2054 # include <unistd.h>
2056 # define GETPAGESIZE() getpagesize()
2059 # if defined(SOLARIS) || defined(DRSNX) || defined(UTS4)
2060 /* OS has SVR4 generic features. */
2061 /* Probably others also qualify. */
2065 # if defined(SOLARIS) || defined(DRSNX)
2066 /* OS has SOLARIS style semi-undocumented interface */
2067 /* to dynamic loader. */
2069 /* OS has SOLARIS style signal handlers. */
2077 # if defined(FREEBSD) && \
2078 (defined(__DragonFly__) || __FreeBSD__ >= 4 || (__FreeBSD_kernel__ >= 4))
2082 # ifdef GC_NETBSD_THREADS
2083 # define SIGRTMIN 33
2084 # define SIGRTMAX 63
2087 # if defined(SVR4) || defined(LINUX) || defined(IRIX5) || defined(HPUX) \
2088 || defined(OPENBSD) || defined(NETBSD) || defined(FREEBSD) \
2089 || defined(DGUX) || defined(BSD) \
2090 || defined(AIX) || defined(DARWIN) || defined(OSF1) \
2092 # define UNIX_LIKE /* Basic Unix-like system calls work. */
2095 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
2100 # undef DYNAMIC_LOADING
2105 # undef MPROTECT_VDB
2109 # ifdef SMALL_CONFIG
2110 /* Presumably not worth the space it takes. */
2112 # undef MPROTECT_VDB
2116 # undef MPROTECT_VDB /* Can't deal with address space holes. */
2119 # ifdef PARALLEL_MARK
2120 # undef MPROTECT_VDB /* For now. */
2123 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB) \
2124 && !defined(GWW_VDB)
2125 # define DEFAULT_VDB
2129 # define PREFETCH(x)
2130 # define NO_PREFETCH
2133 # ifndef PREFETCH_FOR_WRITE
2134 # define PREFETCH_FOR_WRITE(x)
2135 # define NO_PREFETCH_FOR_WRITE
2138 # ifndef CACHE_LINE_SIZE
2139 # define CACHE_LINE_SIZE 32 /* Wild guess */
2142 # if defined(LINUX) || defined(HURD) || defined(__GLIBC__)
2143 # define REGISTER_LIBRARIES_EARLY
2144 /* We sometimes use dl_iterate_phdr, which may acquire an internal */
2145 /* lock. This isn't safe after the world has stopped. So we must */
2146 /* call GC_register_dynamic_libraries before stopping the world. */
2147 /* For performance reasons, this may be beneficial on other */
2148 /* platforms as well, though it should be avoided in win32. */
2151 # if defined(SEARCH_FOR_DATA_START)
2152 extern ptr_t GC_data_start;
2153 # define DATASTART GC_data_start
2156 # ifndef CLEAR_DOUBLE
2157 # define CLEAR_DOUBLE(x) \
2158 ((word*)x)[0] = 0; \
2160 # endif /* CLEAR_DOUBLE */
2162 # if defined(GC_LINUX_THREADS) && defined(REDIRECT_MALLOC) \
2163 && !defined(INCLUDE_LINUX_THREAD_DESCR)
2164 /* Will not work, since libc and the dynamic loader use thread */
2165 /* locals, sometimes as the only reference. */
2166 # define INCLUDE_LINUX_THREAD_DESCR
2169 # if defined(GC_IRIX_THREADS) && !defined(IRIX5)
2170 --> inconsistent configuration
2172 # if defined(GC_LINUX_THREADS) && !defined(LINUX)
2173 --> inconsistent configuration
2175 # if defined(GC_NETBSD_THREADS) && !defined(NETBSD)
2176 --> inconsistent configuration
2178 # if defined(GC_FREEBSD_THREADS) && !defined(FREEBSD)
2179 --> inconsistent configuration
2181 # if defined(GC_SOLARIS_THREADS) && !defined(SOLARIS)
2182 --> inconsistent configuration
2184 # if defined(GC_HPUX_THREADS) && !defined(HPUX)
2185 --> inconsistent configuration
2187 # if defined(GC_AIX_THREADS) && !defined(_AIX)
2188 --> inconsistent configuration
2190 # if defined(GC_GNU_THREADS) && !defined(HURD)
2191 --> inconsistent configuration
2193 # if defined(GC_WIN32_THREADS) && !defined(MSWIN32) && !defined(CYGWIN32)
2194 --> inconsistent configuration
2197 # if defined(PCR) || defined(GC_WIN32_THREADS) || defined(GC_PTHREADS)
2201 # if !defined(USE_MARK_BITS) && !defined(USE_MARK_BYTES)
2202 # if defined(THREADS) && defined(PARALLEL_MARK)
2203 # define USE_MARK_BYTES
2205 # define USE_MARK_BITS
2209 # if defined(MSWINCE)
2214 # define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
2215 /* include assembly code to do it well. */
2218 /* Can we save call chain in objects for debugging? */
2219 /* SET NFRAMES (# of saved frames) and NARGS (#of args for each */
2220 /* frame) to reasonable values for the platform. */
2221 /* Set SAVE_CALL_CHAIN if we can. SAVE_CALL_COUNT can be specified */
2222 /* at build time, though we feel free to adjust it slightly. */
2223 /* Define NEED_CALLINFO if we either save the call stack or */
2224 /* GC_ADD_CALLER is defined. */
2225 /* GC_CAN_SAVE_CALL_STACKS is set in gc.h. */
2228 # define CAN_SAVE_CALL_ARGS
2230 #if (defined(I386) || defined(X86_64)) && (defined(LINUX) || defined(__GLIBC__))
2231 /* SAVE_CALL_CHAIN is supported if the code is compiled to save */
2232 /* frame pointers by default, i.e. no -fomit-frame-pointer flag. */
2233 # define CAN_SAVE_CALL_ARGS
2236 # if defined(SAVE_CALL_COUNT) && !defined(GC_ADD_CALLER) \
2237 && defined(GC_CAN_SAVE_CALL_STACKS)
2238 # define SAVE_CALL_CHAIN
2240 # ifdef SAVE_CALL_CHAIN
2241 # if defined(SAVE_CALL_NARGS) && defined(CAN_SAVE_CALL_ARGS)
2242 # define NARGS SAVE_CALL_NARGS
2244 # define NARGS 0 /* Number of arguments to save for each call. */
2247 # ifdef SAVE_CALL_CHAIN
2248 # ifndef SAVE_CALL_COUNT
2249 # define NFRAMES 6 /* Number of frames to save. Even for */
2250 /* alignment reasons. */
2252 # define NFRAMES ((SAVE_CALL_COUNT + 1) & ~1)
2254 # define NEED_CALLINFO
2255 # endif /* SAVE_CALL_CHAIN */
2256 # ifdef GC_ADD_CALLER
2259 # define NEED_CALLINFO
2262 # if defined(MAKE_BACK_GRAPH) && !defined(DBG_HDRS_ALL)
2263 # define DBG_HDRS_ALL
2266 # if defined(POINTER_MASK) && !defined(POINTER_SHIFT)
2267 # define POINTER_SHIFT 0
2270 # if defined(POINTER_SHIFT) && !defined(POINTER_MASK)
2271 # define POINTER_MASK ((GC_word)(-1))
2274 # if !defined(FIXUP_POINTER) && defined(POINTER_MASK)
2275 # define FIXUP_POINTER(p) (p) = ((p) & (POINTER_MASK) << POINTER_SHIFT)
2278 # if defined(FIXUP_POINTER)
2279 # define NEED_FIXUP_POINTER 1
2281 # define NEED_FIXUP_POINTER 0
2282 # define FIXUP_POINTER(p)
2285 # if !defined(MARK_BIT_PER_GRANULE) && !defined(MARK_BIT_PER_OBJ)
2286 # define MARK_BIT_PER_GRANULE /* Usually faster */
2289 /* Some static sanity tests. */
2290 # if defined(MARK_BIT_PER_GRANULE) && defined(MARK_BIT_PER_OBJ)
2291 # error Define only one of MARK_BIT_PER_GRANULE and MARK_BIT_PER_OBJ.
2294 # if defined(STACK_GROWS_UP) && defined(STACK_GROWS_DOWN)
2295 # error "Only one of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd."
2297 # if !defined(STACK_GROWS_UP) && !defined(STACK_GROWS_DOWN)
2298 # error "One of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd."
2301 # if defined(REDIRECT_MALLOC) && defined(THREADS) && !defined(LINUX)
2302 # error "REDIRECT_MALLOC with THREADS works at most on Linux."
2306 /* This relies on some type definitions from gc_priv.h, from */
2307 /* where it's normally included. */
2309 /* How to get heap memory from the OS: */
2310 /* Note that sbrk()-like allocation is preferred, since it */
2311 /* usually makes it possible to merge consecutively allocated */
2312 /* chunks. It also avoids unintented recursion with */
2313 /* -DREDIRECT_MALLOC. */
2314 /* GET_MEM() returns a HLKSIZE aligned chunk. */
2315 /* 0 is taken to mean failure. */
2316 /* In the case os USE_MMAP, the argument must also be a */
2317 /* physical page size. */
2318 /* GET_MEM is currently not assumed to retrieve 0 filled space, */
2319 /* though we should perhaps take advantage of the case in which */
2321 struct hblk; /* See gc_priv.h. */
2323 char * real_malloc();
2324 # define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \
2327 void * os2_alloc(size_t bytes);
2328 # define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \
2331 # elif defined(NEXT) || defined(DOS4GW) || defined(NONSTOP) || \
2332 (defined(AMIGA) && !defined(GC_AMIGA_FASTALLOC)) || \
2333 (defined(SOLARIS) && !defined(USE_MMAP))
2334 # define GET_MEM(bytes) HBLKPTR((size_t) calloc(1, (size_t)bytes + GC_page_size) \
2336 # elif defined(MSWIN32)
2337 extern ptr_t GC_win32_get_mem();
2338 # define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
2339 # elif defined(MACOS)
2340 # if defined(USE_TEMPORARY_MEMORY)
2341 extern Ptr GC_MacTemporaryNewPtr(size_t size, Boolean clearMemory);
2342 # define GET_MEM(bytes) HBLKPTR( \
2343 GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \
2346 # define GET_MEM(bytes) HBLKPTR( \
2347 NewPtrClear(bytes + GC_page_size) + GC_page_size-1)
2349 # elif defined(MSWINCE)
2350 extern ptr_t GC_wince_get_mem();
2351 # define GET_MEM(bytes) (struct hblk *)GC_wince_get_mem(bytes)
2352 # elif defined(AMIGA) && defined(GC_AMIGA_FASTALLOC)
2353 extern void *GC_amiga_get_mem(size_t size);
2354 # define GET_MEM(bytes) HBLKPTR((size_t) \
2355 GC_amiga_get_mem((size_t)bytes + GC_page_size) \
2358 extern ptr_t GC_unix_get_mem();
2359 # define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
2362 #endif /* GC_PRIVATE_H */
2364 # endif /* GCCONFIG_H */