--- /dev/null
+/*
+ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996 by Silicon Graphics. All rights reserved.
+ * Copyright (c) 2000-2004 Hewlett-Packard Development Company, L.P.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+
+/*
+ * This header is private to the gc. It is almost always included from
+ * gc_priv.h. However it is possible to include it by itself if just the
+ * configuration macros are needed. In that
+ * case, a few declarations relying on types declared in gc_priv.h will be
+ * omitted.
+ */
+
+#ifndef GCCONFIG_H
+#define GCCONFIG_H
+
+# ifndef GC_PRIVATE_H
+ /* Fake ptr_t declaration, just to avoid compilation errors. */
+ /* This avoids many instances if "ifndef GC_PRIVATE_H" below. */
+ typedef struct GC_undefined_struct * ptr_t;
+# include <stddef.h> /* For size_t etc. */
+# endif
+
+/* Machine dependent parameters. Some tuning parameters can be found */
+/* near the top of gc_private.h. */
+
+/* Machine specific parts contributed by various people. See README file. */
+
+/* First a unified test for Linux: */
+# if (defined(linux) || defined(__linux__) || defined(PLATFORM_ANDROID)) \
+ && !defined(LINUX) && !defined(__native_client__)
+# define LINUX
+# endif
+
+/* And one for NetBSD: */
+# if defined(__NetBSD__)
+# define NETBSD
+# endif
+
+/* And one for OpenBSD: */
+# if defined(__OpenBSD__)
+# define OPENBSD
+# endif
+
+/* And one for FreeBSD: */
+# if (defined(__FreeBSD__) || defined(__DragonFly__) \
+ || defined(__FreeBSD_kernel__)) && !defined(FREEBSD)
+# define FREEBSD
+# endif
+
+/* And one for Darwin: */
+# if defined(macosx) || (defined(__APPLE__) && defined(__MACH__))
+# define DARWIN
+# endif
+
+/* Determine the machine type: */
+# if defined(__native_client__)
+# define NACL
+# define I386
+# define mach_type_known
+# endif
+# if defined(__arm) || defined(__arm__) || defined(__thumb__)
+# define ARM32
+# if !defined(LINUX) && !defined(NETBSD) && !defined(OPENBSD) \
+ && !defined(DARWIN) && !defined(_WIN32) && !defined(__CEGCC__)
+# define NOSYS
+# define mach_type_known
+# endif
+# endif
+# if defined(sun) && defined(mc68000)
+# error SUNOS4 no longer supported
+# endif
+# if defined(hp9000s300)
+# error M68K based HP machines no longer supported.
+# endif
+# if defined(OPENBSD) && defined(m68k)
+ /* FIXME: Should we remove this case? */
+# define M68K
+# define mach_type_known
+# endif
+# if defined(OPENBSD) && defined(__sparc__)
+# define SPARC
+# define mach_type_known
+# endif
+# if defined(OPENBSD) && defined(__arm__)
+# define ARM32
+# define mach_type_known
+# endif
+# if defined(OPENBSD) && defined(__sh__)
+# define SH
+# define mach_type_known
+# endif
+# if defined(NETBSD) && (defined(m68k) || defined(__m68k__))
+# define M68K
+# define mach_type_known
+# endif
+# if defined(NETBSD) && defined(__powerpc__)
+# define POWERPC
+# define mach_type_known
+# endif
+# if defined(NETBSD) && (defined(__arm32__) || defined(__arm__))
+# define ARM32
+# define mach_type_known
+# endif
+# if defined(NETBSD) && defined(__sh__)
+# define SH
+# define mach_type_known
+# endif
+# if defined(vax) || defined(__vax__)
+# define VAX
+# ifdef ultrix
+# define ULTRIX
+# else
+# define BSD
+# endif
+# define mach_type_known
+# endif
+# if defined(__NetBSD__) && defined(__vax__)
+# define VAX
+# define mach_type_known
+# endif
+# if defined(mips) || defined(__mips) || defined(_mips)
+# define MIPS
+# if defined(nec_ews) || defined(_nec_ews)
+# define EWS4800
+# endif
+# if !defined(LINUX) && !defined(EWS4800) && !defined(NETBSD) \
+ && !defined(OPENBSD)
+# if defined(ultrix) || defined(__ultrix)
+# define ULTRIX
+# else
+# define IRIX5 /* or IRIX 6.X */
+# endif
+# endif /* !LINUX */
+# if defined(__NetBSD__) && defined(__MIPSEL__)
+# undef ULTRIX
+# endif
+# define mach_type_known
+# endif
+# if defined(DGUX) && (defined(i386) || defined(__i386__))
+# define I386
+# ifndef _USING_DGUX
+# define _USING_DGUX
+# endif
+# define mach_type_known
+# endif
+# if defined(sequent) && (defined(i386) || defined(__i386__))
+# define I386
+# define SEQUENT
+# define mach_type_known
+# endif
+# if defined(sun) && (defined(i386) || defined(__i386__))
+# define I386
+# define SOLARIS
+# define mach_type_known
+# endif
+# if defined(sun) && defined(__amd64)
+# define X86_64
+# define SOLARIS
+# define mach_type_known
+# endif
+# if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
+# define I386
+# define OS2
+# define mach_type_known
+# endif
+# if defined(ibm032)
+# error IBM PC/RT no longer supported.
+# endif
+# if defined(sun) && (defined(sparc) || defined(__sparc))
+# define SPARC
+ /* Test for SunOS 5.x */
+# include <errno.h>
+# define SOLARIS
+# define mach_type_known
+# endif
+# if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
+ && !defined(__OpenBSD__) && !defined(__NetBSD__) \
+ && !defined(__FreeBSD__) && !defined(__DragonFly__)
+# define SPARC
+# define DRSNX
+# define mach_type_known
+# endif
+# if defined(_IBMR2)
+# define POWERPC
+# define AIX
+# define mach_type_known
+# endif
+# if defined(__NetBSD__) && defined(__sparc__)
+# define SPARC
+# define mach_type_known
+# endif
+# if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
+ /* The above test may need refinement */
+# define I386
+# if defined(_SCO_ELF)
+# define SCO_ELF
+# else
+# define SCO
+# endif
+# define mach_type_known
+# endif
+# if defined(_AUX_SOURCE)
+# error A/UX no longer supported
+# endif
+# if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
+ || defined(hppa) || defined(__hppa__)
+# define HP_PA
+# if !defined(LINUX) && !defined(HPUX) && !defined(OPENBSD)
+# define HPUX
+# endif
+# define mach_type_known
+# endif
+# if defined(__ia64) && (defined(_HPUX_SOURCE) || defined(__HP_aCC))
+# define IA64
+# ifndef HPUX
+# define HPUX
+# endif
+# define mach_type_known
+# endif
+# if defined(__BEOS__) && defined(_X86_)
+# define I386
+# define BEOS
+# define mach_type_known
+# endif
+# if defined(OPENBSD) && defined(__amd64__)
+# define X86_64
+# define mach_type_known
+# endif
+# if defined(LINUX) && (defined(i386) || defined(__i386__))
+# define I386
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(__x86_64__)
+# define X86_64
+# define mach_type_known
+# endif
+# if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
+# define IA64
+# define mach_type_known
+# endif
+# if defined(LINUX) && (defined(__arm) || defined(__arm__))
+# define ARM32
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(__cris__)
+# ifndef CRIS
+# define CRIS
+# endif
+# define mach_type_known
+# endif
+# if defined(LINUX) && (defined(powerpc) || defined(__powerpc__) \
+ || defined(powerpc64) || defined(__powerpc64__))
+# define POWERPC
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(__mc68000__)
+# define M68K
+# define mach_type_known
+# endif
+# if defined(LINUX) && (defined(sparc) || defined(__sparc__))
+# define SPARC
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(__sh__)
+# define SH
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(__avr32__)
+# define AVR32
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(__m32r__)
+# define M32R
+# define mach_type_known
+# endif
+# if defined(FREEBSD) && (defined(powerpc) || defined(__powerpc__))
+# define POWERPC
+# define mach_type_known
+# endif
+# if defined(__alpha) || defined(__alpha__)
+# define ALPHA
+# if !defined(LINUX) && !defined(NETBSD) && !defined(OPENBSD) \
+ && !defined(FREEBSD)
+# define OSF1 /* a.k.a Digital Unix */
+# endif
+# define mach_type_known
+# endif
+# if defined(_AMIGA) && !defined(AMIGA)
+# define AMIGA
+# endif
+# ifdef AMIGA
+# define M68K
+# define mach_type_known
+# endif
+# if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
+# define M68K
+# define MACOS
+# define mach_type_known
+# endif
+# if defined(__MWERKS__) && defined(__powerc) && !defined(__MACH__)
+# define POWERPC
+# define MACOS
+# define mach_type_known
+# endif
+# if defined(__OpenBSD__) && defined(__powerpc__)
+# define POWERPC
+# define OPENBSD
+# define mach_type_known
+# endif
+# if defined(DARWIN)
+# if defined(__ppc__) || defined(__ppc64__)
+# define POWERPC
+# define mach_type_known
+# elif defined(__x86_64__) || defined(__x86_64)
+# define X86_64
+# define mach_type_known
+# elif defined(__i386__)
+# define I386
+# define mach_type_known
+# elif defined(__arm__)
+# define ARM32
+# define mach_type_known
+# define DARWIN_DONT_PARSE_STACK
+# endif
+# endif
+# if defined(__rtems__) && (defined(i386) || defined(__i386__))
+# define I386
+# define RTEMS
+# define mach_type_known
+# endif
+# if defined(NeXT) && defined(mc68000)
+# define M68K
+# define NEXT
+# define mach_type_known
+# endif
+# if defined(NeXT) && (defined(i386) || defined(__i386__))
+# define I386
+# define NEXT
+# define mach_type_known
+# endif
+# if defined(__OpenBSD__) && (defined(i386) || defined(__i386__))
+# define I386
+# define OPENBSD
+# define mach_type_known
+# endif
+# if defined(FREEBSD) && (defined(i386) || defined(__i386__))
+# define I386
+# define mach_type_known
+# endif
+# if defined(FREEBSD) && defined(__x86_64__)
+# define X86_64
+# define mach_type_known
+# endif
+# if defined(__NetBSD__) && (defined(i386) || defined(__i386__))
+# define I386
+# define mach_type_known
+# endif
+# if defined(__NetBSD__) && defined(__x86_64__)
+# define X86_64
+# define mach_type_known
+# endif
+# if defined(FREEBSD) && defined(__sparc__)
+# define SPARC
+# define mach_type_known
+# endif
+# if defined(bsdi) && (defined(i386) || defined(__i386__))
+# define I386
+# define BSDI
+# define mach_type_known
+# endif
+# if !defined(mach_type_known) && defined(__386BSD__)
+# define I386
+# define THREE86BSD
+# define mach_type_known
+# endif
+# if defined(_CX_UX) && defined(_M88K)
+# define M88K
+# define CX_UX
+# define mach_type_known
+# endif
+# if defined(DGUX) && defined(m88k)
+# define M88K
+ /* DGUX defined */
+# define mach_type_known
+# endif
+# if defined(_WIN32_WCE) || defined(__CEGCC__) || defined(__MINGW32CE__)
+ /* SH3, SH4, MIPS already defined for corresponding architectures */
+# if defined(SH3) || defined(SH4)
+# define SH
+# endif
+# if defined(x86) || defined(__i386__)
+# define I386
+# endif
+# if defined(_M_ARM) || defined(ARM) || defined(_ARM_)
+# define ARM32
+# endif
+# define MSWINCE
+# define mach_type_known
+# else
+# if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
+ || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
+# if defined(__LP64__) || defined(_WIN64)
+# define X86_64
+# else
+# define I386
+# endif
+# define MSWIN32 /* or Win64 */
+# define mach_type_known
+# endif
+# if defined(_MSC_VER) && defined(_M_IA64)
+# define IA64
+# define MSWIN32 /* Really win64, but we don't treat 64-bit */
+ /* variants as a different platform. */
+# endif
+# endif
+# if defined(__DJGPP__)
+# define I386
+# ifndef DJGPP
+# define DJGPP /* MSDOS running the DJGPP port of GCC */
+# endif
+# define mach_type_known
+# endif
+# if defined(__CYGWIN32__) || defined(__CYGWIN__)
+# define I386
+# define CYGWIN32
+# define mach_type_known
+# endif
+# if defined(__MINGW32__) && !defined(mach_type_known)
+# define I386
+# define MSWIN32
+# define mach_type_known
+# endif
+# if defined(__BORLANDC__)
+# define I386
+# define MSWIN32
+# define mach_type_known
+# endif
+# if defined(_UTS) && !defined(mach_type_known)
+# define S370
+# define UTS4
+# define mach_type_known
+# endif
+# if defined(__pj__)
+# error PicoJava no longer supported
+ /* The implementation had problems, and I haven't heard of users */
+ /* in ages. If you want it resurrected, let me know. */
+# endif
+# if defined(__embedded__) && defined(PPC)
+# define POWERPC
+# define NOSYS
+# define mach_type_known
+# endif
+/* Ivan Demakov */
+# if defined(__WATCOMC__) && defined(__386__)
+# define I386
+# if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
+# if defined(__OS2__)
+# define OS2
+# else
+# if defined(__WINDOWS_386__) || defined(__NT__)
+# define MSWIN32
+# else
+# define DOS4GW
+# endif
+# endif
+# endif
+# define mach_type_known
+# endif
+# if defined(__s390__) && defined(LINUX)
+# define S390
+# define mach_type_known
+# endif
+# if defined(__GNU__)
+# if defined(__i386__)
+/* The Debian Hurd running on generic PC */
+# define HURD
+# define I386
+# define mach_type_known
+# endif
+# endif
+# if defined(__TANDEM)
+ /* Nonstop S-series */
+ /* FIXME: Should recognize Integrity series? */
+# define MIPS
+# define NONSTOP
+# define mach_type_known
+# endif
+# if defined(__hexagon__) && defined(LINUX)
+# define HEXAGON
+# define mach_type_known
+# endif
+
+/* Feel free to add more clauses here */
+
+/* Or manually define the machine type here. A machine type is */
+/* characterized by the architecture. Some */
+/* machine types are further subdivided by OS. */
+/* Macros such as LINUX, FREEBSD, etc. distinguish them. */
+/* SYSV on an M68K actually means A/UX. */
+/* The distinction in these cases is usually the stack starting address */
+# ifndef mach_type_known
+# error "The collector has not been ported to this machine/OS combination."
+# endif
+ /* Mapping is: M68K ==> Motorola 680X0 */
+ /* (NEXT, and SYSV (A/UX), */
+ /* MACOS and AMIGA variants) */
+ /* I386 ==> Intel 386 */
+ /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
+ /* FREEBSD, THREE86BSD, MSWIN32, */
+ /* BSDI,SOLARIS, NEXT, other variants) */
+ /* NS32K ==> Encore Multimax */
+ /* MIPS ==> R2000 through R14K */
+ /* (many variants) */
+ /* VAX ==> DEC VAX */
+ /* (BSD, ULTRIX variants) */
+ /* HP_PA ==> HP9000/700 & /800 */
+ /* HP/UX, LINUX */
+ /* SPARC ==> SPARC v7/v8/v9 */
+ /* (SOLARIS, LINUX, DRSNX variants) */
+ /* ALPHA ==> DEC Alpha */
+ /* (OSF1 and LINUX variants) */
+ /* M88K ==> Motorola 88XX0 */
+ /* (CX_UX and DGUX) */
+ /* S370 ==> 370-like machine */
+ /* running Amdahl UTS4 */
+ /* S390 ==> 390-like machine */
+ /* running LINUX */
+ /* ARM32 ==> Intel StrongARM */
+ /* IA64 ==> Intel IPF */
+ /* (e.g. Itanium) */
+ /* (LINUX and HPUX) */
+ /* SH ==> Hitachi SuperH */
+ /* (LINUX & MSWINCE) */
+ /* X86_64 ==> AMD x86-64 */
+ /* POWERPC ==> IBM/Apple PowerPC */
+ /* (MACOS(<=9),DARWIN(incl.MACOSX),*/
+ /* LINUX, NETBSD, AIX, NOSYS */
+ /* variants) */
+ /* Handles 32 and 64-bit variants. */
+ /* CRIS ==> Axis Etrax */
+ /* M32R ==> Renesas M32R */
+ /* HEXAGON ==> Qualcomm Hexagon */
+
+
+/*
+ * For each architecture and OS, the following need to be defined:
+ *
+ * CPP_WORDSZ is a simple integer constant representing the word size.
+ * in bits. We assume byte addressability, where a byte has 8 bits.
+ * We also assume CPP_WORDSZ is either 32 or 64.
+ * (We care about the length of pointers, not hardware
+ * bus widths. Thus a 64 bit processor with a C compiler that uses
+ * 32 bit pointers should use CPP_WORDSZ of 32, not 64. Default is 32.)
+ *
+ * MACH_TYPE is a string representation of the machine type.
+ * OS_TYPE is analogous for the OS.
+ *
+ * ALIGNMENT is the largest N, such that
+ * all pointer are guaranteed to be aligned on N byte boundaries.
+ * defining it to be 1 will always work, but perform poorly.
+ *
+ * DATASTART is the beginning of the data segment.
+ * On some platforms SEARCH_FOR_DATA_START is defined.
+ * SEARCH_FOR_DATASTART will cause GC_data_start to
+ * be set to an address determined by accessing data backwards from _end
+ * until an unmapped page is found. DATASTART will be defined to be
+ * GC_data_start.
+ * On UNIX-like systems, the collector will scan the area between DATASTART
+ * and DATAEND for root pointers.
+ *
+ * DATAEND, if not `end' where `end' is defined as ``extern int end[];''.
+ * RTH suggests gaining access to linker script synth'd values with
+ * this idiom instead of `&end' where `end' is defined as ``extern int end;'' .
+ * Otherwise, ``GCC will assume these are in .sdata/.sbss'' and it will, e.g.,
+ * cause failures on alpha*-*-* with ``-msmall-data or -fpic'' or mips-*-*
+ * without any special options.
+ *
+ * STACKBOTTOM is the cool end of the stack, which is usually the
+ * highest address in the stack.
+ * Under PCR or OS/2, we have other ways of finding thread stacks.
+ * For each machine, the following should:
+ * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
+ * 2) define exactly one of
+ * STACKBOTTOM (should be defined to be an expression)
+ * LINUX_STACKBOTTOM
+ * HEURISTIC1
+ * HEURISTIC2
+ * If STACKBOTTOM is defined, then it's value will be used directly as the
+ * stack base. If LINUX_STACKBOTTOM is defined, then it will be determined
+ * with a method appropriate for most Linux systems. Currently we look
+ * first for __libc_stack_end (currently only if USE_LIBC_PRIVATES is
+ * defined), and if that fails read it from /proc. (If USE_LIBC_PRIVATES
+ * is not defined and NO_PROC_STAT is defined, we revert to HEURISTIC2.)
+ * If either of the last two macros are defined, then STACKBOTTOM is computed
+ * during collector startup using one of the following two heuristics:
+ * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
+ * the next multiple of STACK_GRAN.
+ * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
+ * in small steps (decrement if STACK_GROWS_UP), and read the value
+ * at each location. Remember the value when the first
+ * Segmentation violation or Bus error is signaled. Round that
+ * to the nearest plausible page boundary, and use that instead
+ * of STACKBOTTOM.
+ *
+ * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
+ * the value of environ is a pointer that can serve as STACKBOTTOM.
+ * I expect that HEURISTIC2 can be replaced by this approach, which
+ * interferes far less with debugging. However it has the disadvantage
+ * that it's confused by a putenv call before the collector is initialized.
+ * This could be dealt with by intercepting putenv ...
+ *
+ * If no expression for STACKBOTTOM can be found, and neither of the above
+ * heuristics are usable, the collector can still be used with all of the above
+ * undefined, provided one of the following is done:
+ * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
+ * without reference to STACKBOTTOM. This is appropriate for use in
+ * conjunction with thread packages, since there will be multiple stacks.
+ * (Allocating thread stacks in the heap, and treating them as ordinary
+ * heap data objects is also possible as a last resort. However, this is
+ * likely to introduce significant amounts of excess storage retention
+ * unless the dead parts of the thread stacks are periodically cleared.)
+ * 2) Client code may set GC_stackbottom before calling any GC_ routines.
+ * If the author of the client code controls the main program, this is
+ * easily accomplished by introducing a new main program, setting
+ * GC_stackbottom to the address of a local variable, and then calling
+ * the original main program. The new main program would read something
+ * like (provided real_main() is not inlined by the compiler):
+ *
+ * # include "gc_private.h"
+ *
+ * main(argc, argv, envp)
+ * int argc;
+ * char **argv, **envp;
+ * {
+ * int dummy;
+ *
+ * GC_stackbottom = (ptr_t)(&dummy);
+ * return(real_main(argc, argv, envp));
+ * }
+ *
+ *
+ * Each architecture may also define the style of virtual dirty bit
+ * implementation to be used:
+ * MPROTECT_VDB: Write protect the heap and catch faults.
+ * GWW_VDB: Use win32 GetWriteWatch primitive.
+ * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
+ *
+ * The first and second one may be combined, in which case a runtime
+ * selection will be made, based on GetWriteWatch availability.
+ *
+ * An architecture may define DYNAMIC_LOADING if dyn_load.c
+ * defined GC_register_dynamic_libraries() for the architecture.
+ *
+ * An architecture may define PREFETCH(x) to preload the cache with *x.
+ * This defaults to a no-op.
+ *
+ * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
+ *
+ * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
+ * clear the two words at GC_malloc-aligned address x. By default,
+ * word stores of 0 are used instead.
+ *
+ * HEAP_START may be defined as the initial address hint for mmap-based
+ * allocation.
+ */
+
+/* If we are using a recent version of gcc, we can use */
+/* __builtin_unwind_init() to push the relevant registers onto the stack. */
+# if defined(__GNUC__) && ((__GNUC__ >= 3) \
+ || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)) \
+ && !defined(__INTEL_COMPILER) && !defined(__PATHCC__) \
+ && !defined(__clang__) /* since no-op in clang (3.0) */
+# define HAVE_BUILTIN_UNWIND_INIT
+# endif
+
+# define STACK_GRAN 0x1000000
+# ifdef M68K
+# define MACH_TYPE "M68K"
+# define ALIGNMENT 2
+# ifdef OPENBSD
+ /* FIXME: Should we remove this case? */
+# define OS_TYPE "OPENBSD"
+# define HEURISTIC2
+# ifdef __ELF__
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define DYNAMIC_LOADING
+# else
+ extern char etext[];
+# define DATASTART ((ptr_t)(etext))
+# endif
+# endif
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+# ifdef __ELF__
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define DYNAMIC_LOADING
+# else
+ extern char etext[];
+# define DATASTART ((ptr_t)(etext))
+# endif
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# define MPROTECT_VDB
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# include <features.h>
+# if defined(__GLIBC__) && __GLIBC__ >= 2
+# define SEARCH_FOR_DATA_START
+# else /* !GLIBC2 */
+# ifdef PLATFORM_ANDROID
+# define __environ environ
+# endif
+ extern char **__environ;
+# define DATASTART ((ptr_t)(&__environ))
+ /* hideous kludge: __environ is the first */
+ /* word in crt0.o, and delimits the start */
+ /* of the data segment, no matter which */
+ /* ld options were passed through. */
+ /* We could use _etext instead, but that */
+ /* would include .rodata, which may */
+ /* contain large read-only data tables */
+ /* that we'd rather not scan. */
+# endif /* !GLIBC2 */
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# else
+ extern int etext[];
+# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
+# endif
+# endif
+# ifdef AMIGA
+# define OS_TYPE "AMIGA"
+ /* STACKBOTTOM and DATASTART handled specially */
+ /* in os_dep.c */
+# define DATAEND /* not needed */
+# define GETPAGESIZE() 4096
+# endif
+# ifdef MACOS
+# ifndef __LOWMEM__
+# include <LowMem.h>
+# endif
+# define OS_TYPE "MACOS"
+ /* see os_dep.c for details of global data segments. */
+# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
+# define DATAEND /* not needed */
+# define GETPAGESIZE() 4096
+# endif
+# ifdef NEXT
+# define OS_TYPE "NEXT"
+# define DATASTART ((ptr_t) get_etext())
+# define DATASTART_IS_FUNC
+# define STACKBOTTOM ((ptr_t) 0x4000000)
+# define DATAEND /* not needed */
+# endif
+# endif
+
+# if defined(POWERPC)
+# define MACH_TYPE "POWERPC"
+# ifdef MACOS
+# define ALIGNMENT 2 /* Still necessary? Could it be 4? */
+# ifndef __LOWMEM__
+# include <LowMem.h>
+# endif
+# define OS_TYPE "MACOS"
+ /* see os_dep.c for details of global data segments. */
+# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
+# define DATAEND /* not needed */
+# endif
+# ifdef LINUX
+# if defined(__powerpc64__)
+# define ALIGNMENT 8
+# define CPP_WORDSZ 64
+# ifndef HBLKSIZE
+# define HBLKSIZE 4096
+# endif
+# else
+# define ALIGNMENT 4
+# endif
+# define OS_TYPE "LINUX"
+ /* HEURISTIC1 has been reliably reported to fail for a 32-bit */
+ /* executable on a 64 bit kernel. */
+# define LINUX_STACKBOTTOM
+# define DYNAMIC_LOADING
+# define SEARCH_FOR_DATA_START
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# endif
+# ifdef DARWIN
+# define OS_TYPE "DARWIN"
+# define DYNAMIC_LOADING
+# if defined(__ppc64__)
+# define ALIGNMENT 8
+# define CPP_WORDSZ 64
+# define STACKBOTTOM ((ptr_t) 0x7fff5fc00000)
+# define CACHE_LINE_SIZE 64
+# ifndef HBLKSIZE
+# define HBLKSIZE 4096
+# endif
+# else
+# define ALIGNMENT 4
+# define STACKBOTTOM ((ptr_t) 0xc0000000)
+# endif
+ /* XXX: see get_end(3), get_etext() and get_end() should not be used. */
+ /* These aren't used when dyld support is enabled (it is by default). */
+# define DATASTART ((ptr_t) get_etext())
+# define DATAEND ((ptr_t) get_end())
+# ifndef USE_MMAP
+# define USE_MMAP
+# endif
+# define USE_MMAP_ANON
+# define MPROTECT_VDB
+# include <unistd.h>
+# define GETPAGESIZE() getpagesize()
+# if defined(USE_PPC_PREFETCH) && defined(__GNUC__)
+ /* The performance impact of prefetches is untested */
+# define PREFETCH(x) \
+ __asm__ __volatile__ ("dcbt 0,%0" : : "r" ((const void *) (x)))
+# define PREFETCH_FOR_WRITE(x) \
+ __asm__ __volatile__ ("dcbtst 0,%0" : : "r" ((const void *) (x)))
+# endif
+ /* There seems to be some issues with trylock hanging on darwin. */
+ /* This should be looked into some more. */
+# define NO_PTHREAD_TRYLOCK
+# endif
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# define ALIGNMENT 4
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 268
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int __data_start[];
+# define DATASTART ((ptr_t)__data_start)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# ifdef FREEBSD
+# if defined(__powerpc64__)
+# define ALIGNMENT 8
+# define CPP_WORDSZ 64
+# ifndef HBLKSIZE
+# define HBLKSIZE 4096
+# endif
+# else
+# define ALIGNMENT 4
+# endif
+# define OS_TYPE "FREEBSD"
+# ifndef GC_FREEBSD_THREADS
+# define MPROTECT_VDB
+# endif
+# define SIG_SUSPEND SIGUSR1
+# define SIG_THR_RESTART SIGUSR2
+# define FREEBSD_STACKBOTTOM
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# endif
+ extern char etext[];
+ ptr_t GC_FreeBSDGetDataStart(size_t, ptr_t);
+# define DATASTART GC_FreeBSDGetDataStart(0x1000, (ptr_t)etext)
+# define DATASTART_IS_FUNC
+# endif
+# ifdef NETBSD
+# define ALIGNMENT 4
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define DYNAMIC_LOADING
+# endif
+# ifdef SN_TARGET_PS3
+# define NO_GETENV
+# define CPP_WORDSZ 32
+# define ALIGNMENT 4
+ extern int _end [];
+ extern int __bss_start;
+# define DATAEND (ptr_t)(_end)
+# define DATASTART (ptr_t)(__bss_start)
+# define STACKBOTTOM ((ptr_t)ps3_get_stack_bottom())
+# endif
+# ifdef AIX
+# define OS_TYPE "AIX"
+# undef ALIGNMENT /* in case it's defined */
+# undef IA64
+ /* DOB: some AIX installs stupidly define IA64 in */
+ /* /usr/include/sys/systemcfg.h */
+# ifdef __64BIT__
+# define ALIGNMENT 8
+# define CPP_WORDSZ 64
+# define STACKBOTTOM ((ptr_t)0x1000000000000000)
+# else
+# define ALIGNMENT 4
+# define CPP_WORDSZ 32
+# define STACKBOTTOM ((ptr_t)((ulong)&errno))
+# endif
+# ifndef USE_MMAP
+# define USE_MMAP
+# endif
+# define USE_MMAP_ANON
+ /* From AIX linker man page:
+ _text Specifies the first location of the program.
+ _etext Specifies the first location after the program.
+ _data Specifies the first location of the data.
+ _edata Specifies the first location after the initialized data
+ _end or end Specifies the first location after all data.
+ */
+ extern int _data[], _end[];
+# define DATASTART ((ptr_t)((ulong)_data))
+# define DATAEND ((ptr_t)((ulong)_end))
+ extern int errno;
+# define DYNAMIC_LOADING
+ /* For really old versions of AIX, this may have to be removed. */
+# endif
+
+# ifdef NOSYS
+# define ALIGNMENT 4
+# define OS_TYPE "NOSYS"
+ extern void __end[], __dso_handle[];
+# define DATASTART (__dso_handle) /* OK, that's ugly. */
+# define DATAEND (ptr_t)(__end)
+ /* Stack starts at 0xE0000000 for the simulator. */
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000000
+# define HEURISTIC1
+# endif
+# endif
+
+# ifdef VAX
+# define MACH_TYPE "VAX"
+# define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
+ extern char etext[];
+# define DATASTART ((ptr_t)(etext))
+# ifdef BSD
+# define OS_TYPE "BSD"
+# define HEURISTIC1
+ /* HEURISTIC2 may be OK, but it's hard to test. */
+# endif
+# ifdef ULTRIX
+# define OS_TYPE "ULTRIX"
+# define STACKBOTTOM ((ptr_t) 0x7fffc800)
+# endif
+# endif
+
+# ifdef SPARC
+# define MACH_TYPE "SPARC"
+# if defined(__arch64__) || defined(__sparcv9)
+# define ALIGNMENT 8
+# define CPP_WORDSZ 64
+# define ELF_CLASS ELFCLASS64
+# else
+# define ALIGNMENT 4 /* Required by hardware */
+# define CPP_WORDSZ 32
+# endif
+ /* Don't define USE_ASM_PUSH_REGS. We do use an asm helper, but */
+ /* not to push the registers on the mark stack. */
+# ifdef SOLARIS
+# define OS_TYPE "SOLARIS"
+ extern int _etext[];
+ extern int _end[];
+ ptr_t GC_SysVGetDataStart(size_t, ptr_t);
+# define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)_etext)
+# define DATASTART_IS_FUNC
+# define DATAEND (ptr_t)(_end)
+# if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
+# define USE_MMAP
+ /* Otherwise we now use calloc. Mmap may result in the */
+ /* heap interleaved with thread stacks, which can result in */
+ /* excessive blacklisting. Sbrk is unusable since it */
+ /* doesn't interact correctly with the system malloc. */
+# endif
+# ifdef USE_MMAP
+# define HEAP_START (ptr_t)0x40000000
+# else
+# define HEAP_START DATAEND
+# endif
+# define PROC_VDB
+/* HEURISTIC1 reportedly no longer works under 2.7. */
+/* HEURISTIC2 probably works, but this appears to be preferable. */
+/* Apparently USRSTACK is defined to be USERLIMIT, but in some */
+/* installations that's undefined. We work around this with a */
+/* gross hack: */
+# include <sys/vmparam.h>
+# ifdef USERLIMIT
+ /* This should work everywhere, but doesn't. */
+# define STACKBOTTOM ((ptr_t) USRSTACK)
+# else
+# define HEURISTIC2
+# endif
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
+ /* getpagesize() appeared to be missing from at least one */
+ /* Solaris 5.4 installation. Weird. */
+# define DYNAMIC_LOADING
+# endif
+# ifdef DRSNX
+# define OS_TYPE "DRSNX"
+ ptr_t GC_SysVGetDataStart(size_t, ptr_t);
+ extern int etext[];
+# define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)etext)
+# define DATASTART_IS_FUNC
+# define MPROTECT_VDB
+# define STACKBOTTOM ((ptr_t) 0xdfff0000)
+# define DYNAMIC_LOADING
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# else
+ Linux Sparc/a.out not supported
+# endif
+ extern int _end[];
+ extern int _etext[];
+# define DATAEND (ptr_t)(_end)
+# define SVR4
+ ptr_t GC_SysVGetDataStart(size_t, ptr_t);
+# ifdef __arch64__
+# define DATASTART GC_SysVGetDataStart(0x100000, (ptr_t)_etext)
+# else
+# define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)_etext)
+# endif
+# define DATASTART_IS_FUNC
+# define LINUX_STACKBOTTOM
+# endif
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 232
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int __data_start[];
+# define DATASTART ((ptr_t)__data_start)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+# ifdef __ELF__
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define DYNAMIC_LOADING
+# else
+ extern char etext[];
+# define DATASTART ((ptr_t)(etext))
+# endif
+# endif
+# ifdef FREEBSD
+# define OS_TYPE "FREEBSD"
+# define SIG_SUSPEND SIGUSR1
+# define SIG_THR_RESTART SIGUSR2
+# define FREEBSD_STACKBOTTOM
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# endif
+ extern char etext[];
+ extern char edata[];
+ extern char end[];
+# define NEED_FIND_LIMIT
+# define DATASTART ((ptr_t)(&etext))
+ ptr_t GC_find_limit(ptr_t, GC_bool);
+# define DATAEND (GC_find_limit (DATASTART, TRUE))
+# define DATAEND_IS_FUNC
+# define DATASTART2 ((ptr_t)(&edata))
+# define DATAEND2 ((ptr_t)(&end))
+# endif
+# endif
+
+# ifdef I386
+# define MACH_TYPE "I386"
+# if defined(__LP64__) || defined(_WIN64)
+# error This should be handled as X86_64
+# else
+# define CPP_WORDSZ 32
+# define ALIGNMENT 4
+ /* Appears to hold for all "32 bit" compilers */
+ /* except Borland. The -a4 option fixes */
+ /* Borland. */
+ /* Ivan Demakov: For Watcom the option is -zp4. */
+# endif
+# ifdef SEQUENT
+# define OS_TYPE "SEQUENT"
+ extern int etext[];
+# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
+# define STACKBOTTOM ((ptr_t) 0x3ffff000)
+# endif
+# ifdef BEOS
+# define OS_TYPE "BEOS"
+# include <OS.h>
+# define GETPAGESIZE() B_PAGE_SIZE
+ extern int etext[];
+# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
+# endif
+# ifdef SOLARIS
+# define OS_TYPE "SOLARIS"
+ extern int _etext[], _end[];
+ ptr_t GC_SysVGetDataStart(size_t, ptr_t);
+# define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
+# define DATASTART_IS_FUNC
+# define DATAEND (ptr_t)(_end)
+/* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
+/* but reportedly breaks under 2.8. It appears that the stack */
+/* base is a property of the executable, so this should not break */
+/* old executables. */
+/* HEURISTIC2 probably works, but this appears to be preferable. */
+# include <sys/vm.h>
+# define STACKBOTTOM ((ptr_t) USRSTACK)
+/* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
+/* It appears to be fixed in 2.8 and 2.9. */
+# ifdef SOLARIS25_PROC_VDB_BUG_FIXED
+# define PROC_VDB
+# endif
+# ifndef GC_THREADS
+# define MPROTECT_VDB
+# endif
+# define DYNAMIC_LOADING
+# if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
+# define USE_MMAP
+ /* Otherwise we now use calloc. Mmap may result in the */
+ /* heap interleaved with thread stacks, which can result in */
+ /* excessive blacklisting. Sbrk is unusable since it */
+ /* doesn't interact correctly with the system malloc. */
+# endif
+# ifdef USE_MMAP
+# define HEAP_START (ptr_t)0x40000000
+# else
+# define HEAP_START DATAEND
+# endif
+# endif
+# ifdef SCO
+# define OS_TYPE "SCO"
+ extern int etext[];
+# define DATASTART ((ptr_t)((((word) (etext)) + 0x3fffff) \
+ & ~0x3fffff) \
+ +((word)etext & 0xfff))
+# define STACKBOTTOM ((ptr_t) 0x7ffffffc)
+# endif
+# ifdef SCO_ELF
+# define OS_TYPE "SCO_ELF"
+ extern int etext[];
+# define DATASTART ((ptr_t)(etext))
+# define STACKBOTTOM ((ptr_t) 0x08048000)
+# define DYNAMIC_LOADING
+# define ELF_CLASS ELFCLASS32
+# endif
+# ifdef DGUX
+# define OS_TYPE "DGUX"
+ extern int _etext, _end;
+ ptr_t GC_SysVGetDataStart(size_t, ptr_t);
+# define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)(&_etext))
+# define DATASTART_IS_FUNC
+# define DATAEND (ptr_t)(&_end)
+# define STACK_GROWS_DOWN
+# define HEURISTIC2
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
+# define DYNAMIC_LOADING
+# ifndef USE_MMAP
+# define USE_MMAP
+# endif
+# define MAP_FAILED (void *) ((word)-1)
+# ifdef USE_MMAP
+# define HEAP_START (ptr_t)0x40000000
+# else
+# define HEAP_START DATAEND
+# endif
+# endif /* DGUX */
+
+# ifdef NACL
+# define OS_TYPE "NACL"
+ extern int etext[];
+# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
+ extern int _end[];
+# define DATAEND (_end)
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000
+# define HEURISTIC1
+# define GETPAGESIZE() 65536
+# ifndef MAX_NACL_GC_THREADS
+# define MAX_NACL_GC_THREADS 1024
+# endif
+# endif /* NACL */
+
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# if 0
+# define HEURISTIC1
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000000
+ /* STACKBOTTOM is usually 0xc0000000, but this changes with */
+ /* different kernel configurations. In particular, systems */
+ /* with 2GB physical memory will usually move the user */
+ /* address space limit, and hence initial SP to 0x80000000. */
+# endif
+# if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
+# define MPROTECT_VDB
+# else
+ /* We seem to get random errors in incremental mode, */
+ /* possibly because Linux threads is itself a malloc client */
+ /* and can't deal with the signals. */
+# endif
+# define HEAP_START (ptr_t)0x1000
+ /* This encourages mmap to give us low addresses, */
+ /* thus allowing the heap to grow to ~3GB */
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# ifdef UNDEFINED /* includes ro data */
+ extern int _etext[];
+# define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
+# endif
+# include <features.h>
+# if defined(__GLIBC__) && __GLIBC__ >= 2 \
+ || defined(PLATFORM_ANDROID)
+# define SEARCH_FOR_DATA_START
+# else
+ extern char **__environ;
+# define DATASTART ((ptr_t)(&__environ))
+ /* hideous kludge: __environ is the first */
+ /* word in crt0.o, and delimits the start */
+ /* of the data segment, no matter which */
+ /* ld options were passed through. */
+ /* We could use _etext instead, but that */
+ /* would include .rodata, which may */
+ /* contain large read-only data tables */
+ /* that we'd rather not scan. */
+# endif
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# else
+ extern int etext[];
+# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
+# endif
+# ifdef USE_I686_PREFETCH
+ /* FIXME: Thus should use __builtin_prefetch, but we'll leave that */
+ /* for the next rtelease. */
+# define PREFETCH(x) \
+ __asm__ __volatile__ ("prefetchnta %0" : : "m"(*(char *)(x)))
+ /* Empirically prefetcht0 is much more effective at reducing */
+ /* cache miss stalls for the targeted load instructions. But it */
+ /* seems to interfere enough with other cache traffic that the */
+ /* net result is worse than prefetchnta. */
+# ifdef FORCE_WRITE_PREFETCH
+ /* Using prefetches for write seems to have a slight negative */
+ /* impact on performance, at least for a PIII/500. */
+# define PREFETCH_FOR_WRITE(x) \
+ __asm__ __volatile__ ("prefetcht0 %0" : : "m"(*(char *)(x)))
+# endif
+# endif
+# ifdef USE_3DNOW_PREFETCH
+# define PREFETCH(x) \
+ __asm__ __volatile__ ("prefetch %0" : : "m"(*(char *)(x)))
+# define PREFETCH_FOR_WRITE(x) \
+ __asm__ __volatile__ ("prefetchw %0" : : "m"(*(char *)(x)))
+# endif
+# endif
+# ifdef CYGWIN32
+# define OS_TYPE "CYGWIN32"
+# define DATASTART ((ptr_t)GC_DATASTART) /* From gc.h */
+# define DATAEND ((ptr_t)GC_DATAEND)
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000
+# ifdef USE_MMAP
+# define NEED_FIND_LIMIT
+# define USE_MMAP_ANON
+# endif
+# endif
+# ifdef OS2
+# define OS_TYPE "OS2"
+ /* STACKBOTTOM and DATASTART are handled specially in */
+ /* os_dep.c. OS2 actually has the right */
+ /* system call! */
+# define DATAEND /* not needed */
+# endif
+# ifdef MSWIN32
+# define OS_TYPE "MSWIN32"
+ /* STACKBOTTOM and DATASTART are handled specially in */
+ /* os_dep.c. */
+# define MPROTECT_VDB
+# define GWW_VDB
+# define DATAEND /* not needed */
+# endif
+# ifdef MSWINCE
+# define OS_TYPE "MSWINCE"
+# define DATAEND /* not needed */
+# endif
+# ifdef DJGPP
+# define OS_TYPE "DJGPP"
+# include "stubinfo.h"
+ extern int etext[];
+ extern int _stklen;
+ extern int __djgpp_stack_limit;
+# define DATASTART ((ptr_t)((((word) (etext)) + 0x1ff) & ~0x1ff))
+/* #define STACKBOTTOM ((ptr_t)((word)_stubinfo+_stubinfo->size+_stklen)) */
+# define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
+ /* This may not be right. */
+# endif
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 176
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int __data_start[];
+# define DATASTART ((ptr_t)__data_start)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# ifdef FREEBSD
+# define OS_TYPE "FREEBSD"
+# ifndef GC_FREEBSD_THREADS
+# define MPROTECT_VDB
+# endif
+# ifdef __GLIBC__
+# define SIG_SUSPEND (32+6)
+# define SIG_THR_RESTART (32+5)
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# else
+# define SIG_SUSPEND SIGUSR1
+# define SIG_THR_RESTART SIGUSR2
+# endif
+# define FREEBSD_STACKBOTTOM
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# endif
+ extern char etext[];
+ char * GC_FreeBSDGetDataStart(size_t, ptr_t);
+# define DATASTART GC_FreeBSDGetDataStart(0x1000, (ptr_t)etext)
+# define DATASTART_IS_FUNC
+# endif
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# endif
+# endif
+# ifdef THREE86BSD
+# define OS_TYPE "THREE86BSD"
+# endif
+# ifdef BSDI
+# define OS_TYPE "BSDI"
+# endif
+# if defined(NETBSD) || defined(THREE86BSD) || defined(BSDI)
+# define HEURISTIC2
+ extern char etext[];
+# define DATASTART ((ptr_t)(etext))
+# endif
+# ifdef NEXT
+# define OS_TYPE "NEXT"
+# define DATASTART ((ptr_t) get_etext())
+# define DATASTART_IS_FUNC
+# define STACKBOTTOM ((ptr_t)0xc0000000)
+# define DATAEND /* not needed */
+# endif
+# ifdef RTEMS
+# define OS_TYPE "RTEMS"
+# include <sys/unistd.h>
+ extern int etext[];
+ extern int end[];
+ void *rtems_get_stack_bottom(void);
+# define InitStackBottom rtems_get_stack_bottom()
+# define DATASTART ((ptr_t)etext)
+# define DATAEND ((ptr_t)end)
+# define STACKBOTTOM ((ptr_t)InitStackBottom)
+# define SIG_SUSPEND SIGUSR1
+# define SIG_THR_RESTART SIGUSR2
+# endif
+# ifdef DOS4GW
+# define OS_TYPE "DOS4GW"
+ extern long __nullarea;
+ extern char _end;
+ extern char *_STACKTOP;
+ /* Depending on calling conventions Watcom C either precedes */
+ /* or does not precedes with underscore names of C-variables. */
+ /* Make sure startup code variables always have the same names. */
+ #pragma aux __nullarea "*";
+ #pragma aux _end "*";
+# define STACKBOTTOM ((ptr_t) _STACKTOP)
+ /* confused? me too. */
+# define DATASTART ((ptr_t) &__nullarea)
+# define DATAEND ((ptr_t) &_end)
+# endif
+# ifdef HURD
+# define OS_TYPE "HURD"
+# define STACK_GROWS_DOWN
+# define HEURISTIC2
+# define SIG_SUSPEND SIGUSR1
+# define SIG_THR_RESTART SIGUSR2
+# define SEARCH_FOR_DATA_START
+ extern int _end[];
+# define DATAEND ((ptr_t) (_end))
+/* # define MPROTECT_VDB Not quite working yet? */
+# define DYNAMIC_LOADING
+# endif
+# ifdef DARWIN
+# define OS_TYPE "DARWIN"
+# define DARWIN_DONT_PARSE_STACK
+# define DYNAMIC_LOADING
+ /* XXX: see get_end(3), get_etext() and get_end() should not be used. */
+ /* These aren't used when dyld support is enabled (it is by default). */
+# define DATASTART ((ptr_t) get_etext())
+# define DATAEND ((ptr_t) get_end())
+# define STACKBOTTOM ((ptr_t) 0xc0000000)
+# ifndef USE_MMAP
+# define USE_MMAP
+# endif
+# define USE_MMAP_ANON
+# define MPROTECT_VDB
+# include <unistd.h>
+# define GETPAGESIZE() getpagesize()
+ /* There seems to be some issues with trylock hanging on darwin. */
+ /* This should be looked into some more. */
+# define NO_PTHREAD_TRYLOCK
+# endif /* DARWIN */
+# endif
+
+# ifdef NS32K
+# define MACH_TYPE "NS32K"
+# define ALIGNMENT 4
+ extern char **environ;
+# define DATASTART ((ptr_t)(&environ))
+ /* hideous kludge: environ is the first */
+ /* word in crt0.o, and delimits the start */
+ /* of the data segment, no matter which */
+ /* ld options were passed through. */
+# define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
+# endif
+
+# ifdef MIPS
+# define MACH_TYPE "MIPS"
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define DYNAMIC_LOADING
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+ extern int __data_start[];
+# define DATASTART ((ptr_t)(__data_start))
+# ifdef _MIPS_SZPTR
+# define CPP_WORDSZ _MIPS_SZPTR
+# define ALIGNMENT (_MIPS_SZPTR/8)
+# else
+# define ALIGNMENT 4
+# endif
+# ifndef HBLKSIZE
+# define HBLKSIZE 4096
+# endif
+# if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2 || __GLIBC__ > 2
+# define LINUX_STACKBOTTOM
+# else
+# define STACKBOTTOM ((ptr_t)0x7fff8000)
+# endif
+# endif /* Linux */
+# ifdef EWS4800
+# define HEURISTIC2
+# if defined(_MIPS_SZPTR) && (_MIPS_SZPTR == 64)
+ extern int _fdata[], _end[];
+# define DATASTART ((ptr_t)_fdata)
+# define DATAEND ((ptr_t)_end)
+# define CPP_WORDSZ _MIPS_SZPTR
+# define ALIGNMENT (_MIPS_SZPTR/8)
+# else
+ extern int etext[], edata[], end[];
+ extern int _DYNAMIC_LINKING[], _gp[];
+# define DATASTART ((ptr_t)((((word)etext + 0x3ffff) & ~0x3ffff) \
+ + ((word)etext & 0xffff)))
+# define DATAEND (ptr_t)(edata)
+# define DATASTART2 (_DYNAMIC_LINKING \
+ ? (ptr_t)(((word)_gp + 0x8000 + 0x3ffff) & ~0x3ffff) \
+ : (ptr_t)edata)
+# define DATAEND2 (ptr_t)(end)
+# define ALIGNMENT 4
+# endif
+# define OS_TYPE "EWS4800"
+# endif
+# ifdef ULTRIX
+# define HEURISTIC2
+# define DATASTART (ptr_t)0x10000000
+ /* Could probably be slightly higher since */
+ /* startup code allocates lots of stuff. */
+# define OS_TYPE "ULTRIX"
+# define ALIGNMENT 4
+# endif
+# ifdef IRIX5
+# define HEURISTIC2
+ extern int _fdata[];
+# define DATASTART ((ptr_t)(_fdata))
+# ifdef USE_MMAP
+# define HEAP_START (ptr_t)0x30000000
+# else
+# define HEAP_START DATASTART
+# endif
+ /* Lowest plausible heap address. */
+ /* In the MMAP case, we map there. */
+ /* In either case it is used to identify */
+ /* heap sections so they're not */
+ /* considered as roots. */
+# define OS_TYPE "IRIX5"
+/*# define MPROTECT_VDB DOB: this should work, but there is evidence */
+/* of recent breakage. */
+# ifdef _MIPS_SZPTR
+# define CPP_WORDSZ _MIPS_SZPTR
+# define ALIGNMENT (_MIPS_SZPTR/8)
+# else
+# define ALIGNMENT 4
+# endif
+# define DYNAMIC_LOADING
+# endif
+# ifdef MSWINCE
+# define OS_TYPE "MSWINCE"
+# define ALIGNMENT 4
+# define DATAEND /* not needed */
+# endif
+# if defined(NETBSD)
+# define OS_TYPE "NETBSD"
+# define ALIGNMENT 4
+# define HEURISTIC2
+# ifdef __ELF__
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define NEED_FIND_LIMIT
+# define DYNAMIC_LOADING
+# else
+# define DATASTART ((ptr_t) 0x10000000)
+# define STACKBOTTOM ((ptr_t) 0x7ffff000)
+# endif /* _ELF_ */
+# endif
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# define ALIGNMENT 4
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 808
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int _fdata[];
+# define DATASTART ((ptr_t)_fdata)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# if defined(NONSTOP)
+# define CPP_WORDSZ 32
+# define OS_TYPE "NONSTOP"
+# define ALIGNMENT 4
+# define DATASTART ((ptr_t) 0x08000000)
+ extern char **environ;
+# define DATAEND ((ptr_t)(environ - 0x10))
+# define STACKBOTTOM ((ptr_t) 0x4fffffff)
+# endif
+# endif
+
+# ifdef HP_PA
+# define MACH_TYPE "HP_PA"
+# ifdef __LP64__
+# define CPP_WORDSZ 64
+# define ALIGNMENT 8
+# else
+# define CPP_WORDSZ 32
+# define ALIGNMENT 4
+# endif
+# if !defined(GC_HPUX_THREADS) && !defined(GC_LINUX_THREADS) \
+ && !defined(OPENBSD) && !defined(LINUX) /* For now. */
+# define MPROTECT_VDB
+# endif
+# define STACK_GROWS_UP
+# ifdef HPUX
+# define OS_TYPE "HPUX"
+ extern int __data_start[];
+# define DATASTART ((ptr_t)(__data_start))
+# ifdef USE_HPUX_FIXED_STACKBOTTOM
+ /* The following appears to work for 7xx systems running HP/UX */
+ /* 9.xx Furthermore, it might result in much faster */
+ /* collections than HEURISTIC2, which may involve scanning */
+ /* segments that directly precede the stack. It is not the */
+ /* default, since it may not work on older machine/OS */
+ /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
+ /* this.) */
+# define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
+# else
+ /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
+ /* to this. Note that the GC must be initialized before the */
+ /* first putenv call. */
+ extern char ** environ;
+# define STACKBOTTOM ((ptr_t)environ)
+# endif
+# define DYNAMIC_LOADING
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
+# ifndef __GNUC__
+# define PREFETCH(x) { \
+ register long addr = (long)(x); \
+ (void) _asm ("LDW", 0, 0, addr, 0); \
+ }
+# endif
+# endif /* HPUX */
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# define DYNAMIC_LOADING
+# define SEARCH_FOR_DATA_START
+ extern int _end[];
+# define DATAEND (ptr_t)(&_end)
+# endif /* LINUX */
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 520
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int __data_start[];
+# define DATASTART ((ptr_t)__data_start)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# endif /* HP_PA */
+
+# ifdef ALPHA
+# define MACH_TYPE "ALPHA"
+# define ALIGNMENT 8
+# define CPP_WORDSZ 64
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define ELFCLASS32 32
+# define ELFCLASS64 64
+# define ELF_CLASS ELFCLASS64
+# define DYNAMIC_LOADING
+# endif
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# define ELF_CLASS ELFCLASS64
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 816
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int __data_start[];
+# define DATASTART ((ptr_t)__data_start)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# ifdef FREEBSD
+# define OS_TYPE "FREEBSD"
+/* MPROTECT_VDB is not yet supported at all on FreeBSD/alpha. */
+# define SIG_SUSPEND SIGUSR1
+# define SIG_THR_RESTART SIGUSR2
+# define FREEBSD_STACKBOTTOM
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# endif
+/* Handle unmapped hole alpha*-*-freebsd[45]* puts between etext and edata. */
+ extern char etext[];
+ extern char edata[];
+ extern char end[];
+# define NEED_FIND_LIMIT
+# define DATASTART ((ptr_t)(&etext))
+ ptr_t GC_find_limit(ptr_t, GC_bool);
+# define DATAEND (GC_find_limit (DATASTART, TRUE))
+# define DATAEND_IS_FUNC
+# define DATASTART2 ((ptr_t)(&edata))
+# define DATAEND2 ((ptr_t)(&end))
+# endif
+# ifdef OSF1
+# define OS_TYPE "OSF1"
+# define DATASTART ((ptr_t) 0x140000000)
+ extern int _end[];
+# define DATAEND ((ptr_t) &_end)
+ extern char ** environ;
+ /* round up from the value of environ to the nearest page boundary */
+ /* Probably breaks if putenv is called before collector */
+ /* initialization. */
+# define STACKBOTTOM ((ptr_t)(((word)(environ) | (getpagesize()-1))+1))
+/* # define HEURISTIC2 */
+ /* Normally HEURISTIC2 is too conservative, since */
+ /* the text segment immediately follows the stack. */
+ /* Hence we give an upper pound. */
+ /* This is currently unused, since we disabled HEURISTIC2 */
+ extern int __start[];
+# define HEURISTIC2_LIMIT ((ptr_t)((word)(__start) & ~(getpagesize()-1)))
+# ifndef GC_OSF1_THREADS
+ /* Unresolved signal issues with threads. */
+# define MPROTECT_VDB
+# endif
+# define DYNAMIC_LOADING
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# ifdef __ELF__
+# define SEARCH_FOR_DATA_START
+# define DYNAMIC_LOADING
+# else
+# define DATASTART ((ptr_t) 0x140000000)
+# endif
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# define MPROTECT_VDB
+ /* Has only been superficially tested. May not */
+ /* work on all versions. */
+# endif
+# endif
+
+# ifdef IA64
+# define MACH_TYPE "IA64"
+# ifdef HPUX
+# ifdef _ILP32
+# define CPP_WORDSZ 32
+ /* Requires 8 byte alignment for malloc */
+# define ALIGNMENT 4
+# else
+# ifndef _LP64
+# error --> unknown ABI
+# endif
+# define CPP_WORDSZ 64
+ /* Requires 16 byte alignment for malloc */
+# define ALIGNMENT 8
+# endif
+# define OS_TYPE "HPUX"
+ extern int __data_start[];
+# define DATASTART ((ptr_t)(__data_start))
+ /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
+ /* to this. Note that the GC must be initialized before the */
+ /* first putenv call. */
+ extern char ** environ;
+# define STACKBOTTOM ((ptr_t)environ)
+# define HPUX_STACKBOTTOM
+# define DYNAMIC_LOADING
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
+ /* The following was empirically determined, and is probably */
+ /* not very robust. */
+ /* Note that the backing store base seems to be at a nice */
+ /* address minus one page. */
+# define BACKING_STORE_DISPLACEMENT 0x1000000
+# define BACKING_STORE_ALIGNMENT 0x1000
+ extern ptr_t GC_register_stackbottom;
+# define BACKING_STORE_BASE GC_register_stackbottom
+ /* Known to be wrong for recent HP/UX versions!!! */
+# endif
+# ifdef LINUX
+# define CPP_WORDSZ 64
+# define ALIGNMENT 8
+# define OS_TYPE "LINUX"
+ /* The following works on NUE and older kernels: */
+/* # define STACKBOTTOM ((ptr_t) 0xa000000000000000l) */
+ /* This does not work on NUE: */
+# define LINUX_STACKBOTTOM
+ /* We also need the base address of the register stack */
+ /* backing store. This is computed in */
+ /* GC_linux_register_stack_base based on the following */
+ /* constants: */
+# define BACKING_STORE_ALIGNMENT 0x100000
+# define BACKING_STORE_DISPLACEMENT 0x80000000
+ extern ptr_t GC_register_stackbottom;
+# define BACKING_STORE_BASE GC_register_stackbottom
+# define SEARCH_FOR_DATA_START
+# ifdef __GNUC__
+# define DYNAMIC_LOADING
+# else
+ /* In the Intel compiler environment, we seem to end up with */
+ /* statically linked executables and an undefined reference */
+ /* to _DYNAMIC */
+# endif
+# define MPROTECT_VDB
+ /* Requires Linux 2.3.47 or later. */
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# ifdef __GNUC__
+# ifndef __INTEL_COMPILER
+# define PREFETCH(x) \
+ __asm__ (" lfetch [%0]": : "r"(x))
+# define PREFETCH_FOR_WRITE(x) \
+ __asm__ (" lfetch.excl [%0]": : "r"(x))
+# define CLEAR_DOUBLE(x) \
+ __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
+# else
+# include <ia64intrin.h>
+# define PREFETCH(x) \
+ __lfetch(__lfhint_none, (x))
+# define PREFETCH_FOR_WRITE(x) \
+ __lfetch(__lfhint_nta, (x))
+# define CLEAR_DOUBLE(x) \
+ __stf_spill((void *)(x), 0)
+# endif /* __INTEL_COMPILER */
+# endif
+# endif
+# ifdef MSWIN32
+ /* FIXME: This is a very partial guess. There is no port, yet. */
+# define OS_TYPE "MSWIN32"
+ /* STACKBOTTOM and DATASTART are handled specially in */
+ /* os_dep.c. */
+# define DATAEND /* not needed */
+# if defined(_WIN64)
+# define CPP_WORDSZ 64
+# else
+# define CPP_WORDSZ 32 /* Is this possible? */
+# endif
+# define ALIGNMENT 8
+# endif
+# endif
+
+# ifdef M88K
+# define MACH_TYPE "M88K"
+# define ALIGNMENT 4
+ extern int etext[];
+# ifdef CX_UX
+# define OS_TYPE "CX_UX"
+# define DATASTART ((((word)etext + 0x3fffff) & ~0x3fffff) + 0x10000)
+# endif
+# ifdef DGUX
+# define OS_TYPE "DGUX"
+ ptr_t GC_SysVGetDataStart(size_t, ptr_t);
+# define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)etext)
+# define DATASTART_IS_FUNC
+# endif
+# define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
+# endif
+
+# ifdef S370
+ /* If this still works, and if anyone cares, this should probably */
+ /* be moved to the S390 category. */
+# define MACH_TYPE "S370"
+# define ALIGNMENT 4 /* Required by hardware */
+# ifdef UTS4
+# define OS_TYPE "UTS4"
+ extern int etext[];
+ extern int _etext[];
+ extern int _end[];
+ ptr_t GC_SysVGetDataStart(size_t, ptr_t);
+# define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)_etext)
+# define DATASTART_IS_FUNC
+# define DATAEND (ptr_t)(_end)
+# define HEURISTIC2
+# endif
+# endif
+
+# ifdef S390
+# define MACH_TYPE "S390"
+# ifndef __s390x__
+# define ALIGNMENT 4
+# define CPP_WORDSZ 32
+# else
+# define ALIGNMENT 8
+# define CPP_WORDSZ 64
+# ifndef HBLKSIZE
+# define HBLKSIZE 4096
+# endif
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# define DYNAMIC_LOADING
+ extern int __data_start[];
+# define DATASTART ((ptr_t)(__data_start))
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# define CACHE_LINE_SIZE 256
+# define GETPAGESIZE() 4096
+# endif
+# endif
+
+# ifdef ARM32
+# define CPP_WORDSZ 32
+# define MACH_TYPE "ARM32"
+# define ALIGNMENT 4
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+# ifdef __ELF__
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define DYNAMIC_LOADING
+# else
+ extern char etext[];
+# define DATASTART ((ptr_t)(etext))
+# endif
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000000
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# include <features.h>
+# if defined(__GLIBC__) && __GLIBC__ >= 2 \
+ || defined(PLATFORM_ANDROID)
+# define SEARCH_FOR_DATA_START
+# else
+ extern char **__environ;
+# define DATASTART ((ptr_t)(&__environ))
+ /* hideous kludge: __environ is the first */
+ /* word in crt0.o, and delimits the start */
+ /* of the data segment, no matter which */
+ /* ld options were passed through. */
+ /* We could use _etext instead, but that */
+ /* would include .rodata, which may */
+ /* contain large read-only data tables */
+ /* that we'd rather not scan. */
+# endif
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# else
+ extern int etext[];
+# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
+# endif
+# endif
+# ifdef MSWINCE
+# define OS_TYPE "MSWINCE"
+# define DATAEND /* not needed */
+# endif
+# ifdef DARWIN
+ /* iPhone */
+# define OS_TYPE "DARWIN"
+# define DYNAMIC_LOADING
+# define DATASTART ((ptr_t) get_etext())
+# define DATAEND ((ptr_t) get_end())
+# define STACKBOTTOM ((ptr_t) 0x30000000)
+# ifndef USE_MMAP
+# define USE_MMAP
+# endif
+# define USE_MMAP_ANON
+# define MPROTECT_VDB
+# include <unistd.h>
+# define GETPAGESIZE() getpagesize()
+ /* FIXME: There seems to be some issues with trylock hanging on */
+ /* darwin. This should be looked into some more. */
+# define NO_PTHREAD_TRYLOCK
+# ifndef NO_DYLD_BIND_FULLY_IMAGE
+# define NO_DYLD_BIND_FULLY_IMAGE
+# endif
+# endif
+# ifdef OPENBSD
+# define ALIGNMENT 4
+# define OS_TYPE "OPENBSD"
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 176
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int __data_start[];
+# define DATASTART ((ptr_t)__data_start)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# ifdef NOSYS
+ /* __data_start is usually defined in the target linker script. */
+ extern int __data_start[];
+# define DATASTART (ptr_t)(__data_start)
+ /* __stack_base__ is set in newlib/libc/sys/arm/crt0.S */
+ extern void *__stack_base__;
+# define STACKBOTTOM ((ptr_t) (__stack_base__))
+# endif
+#endif
+
+# ifdef CRIS
+# define MACH_TYPE "CRIS"
+# define CPP_WORDSZ 32
+# define ALIGNMENT 1
+# define OS_TYPE "LINUX"
+# define DYNAMIC_LOADING
+# define LINUX_STACKBOTTOM
+# define SEARCH_FOR_DATA_START
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# endif
+
+# if defined(SH) && !defined(SH4)
+# define MACH_TYPE "SH"
+# define ALIGNMENT 4
+# ifdef MSWINCE
+# define OS_TYPE "MSWINCE"
+# define DATAEND /* not needed */
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# define DYNAMIC_LOADING
+# define SEARCH_FOR_DATA_START
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# endif
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define DYNAMIC_LOADING
+# endif
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 332
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int __data_start[];
+# define DATASTART ((ptr_t)__data_start)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# endif
+
+# ifdef SH4
+# define MACH_TYPE "SH4"
+# define OS_TYPE "MSWINCE"
+# define ALIGNMENT 4
+# define DATAEND /* not needed */
+# endif
+
+# ifdef AVR32
+# define MACH_TYPE "AVR32"
+# define CPP_WORDSZ 32
+# define ALIGNMENT 4
+# define OS_TYPE "LINUX"
+# define DYNAMIC_LOADING
+# define LINUX_STACKBOTTOM
+# define USE_GENERIC_PUSH_REGS
+# define SEARCH_FOR_DATA_START
+ extern int _end[];
+# define DATAEND (_end)
+# endif
+
+# ifdef M32R
+# define CPP_WORDSZ 32
+# define MACH_TYPE "M32R"
+# define ALIGNMENT 4
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000000
+# define DYNAMIC_LOADING
+# define SEARCH_FOR_DATA_START
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# endif
+# endif
+
+# ifdef X86_64
+# define MACH_TYPE "X86_64"
+# ifdef __ILP32__
+# define ALIGNMENT 4
+# define CPP_WORDSZ 32
+# else
+# define ALIGNMENT 8
+# define CPP_WORDSZ 64
+# endif
+# ifndef HBLKSIZE
+# define HBLKSIZE 4096
+# endif
+# define CACHE_LINE_SIZE 64
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# define ELF_CLASS ELFCLASS64
+# ifdef GC_OPENBSD_THREADS
+# define UTHREAD_SP_OFFSET 400
+# else
+# include <sys/param.h>
+# include <uvm/uvm_extern.h>
+# define STACKBOTTOM USRSTACK
+# endif
+ extern int __data_start[];
+# define DATASTART ((ptr_t)__data_start)
+ extern char _end[];
+# define DATAEND ((ptr_t)(&_end))
+# define DYNAMIC_LOADING
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
+# define MPROTECT_VDB
+# else
+ /* We seem to get random errors in incremental mode, */
+ /* possibly because Linux threads is itself a malloc client */
+ /* and can't deal with the signals. */
+# endif
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# ifdef UNDEFINED /* includes ro data */
+ extern int _etext[];
+# define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
+# endif
+# include <features.h>
+# define SEARCH_FOR_DATA_START
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# else
+ extern int etext[];
+# define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
+# endif
+# if defined(__GNUC__) && __GNUC__ >= 3
+# define PREFETCH(x) __builtin_prefetch((x), 0, 0)
+# define PREFETCH_FOR_WRITE(x) __builtin_prefetch((x), 1)
+# endif
+# if defined(__GLIBC__)
+ /* At present, there's a bug in GLibc getcontext() on */
+ /* Linux/x64 (it clears FPU exception mask). We define this */
+ /* macro to workaround it. */
+ /* FIXME: This seems to be fixed in GLibc v2.14. */
+# define GETCONTEXT_FPU_EXCMASK_BUG
+# endif
+# endif
+# ifdef DARWIN
+# define OS_TYPE "DARWIN"
+# define DARWIN_DONT_PARSE_STACK
+# define DYNAMIC_LOADING
+ /* XXX: see get_end(3), get_etext() and get_end() should not be used. */
+ /* These aren't used when dyld support is enabled (it is by default) */
+# define DATASTART ((ptr_t) get_etext())
+# define DATAEND ((ptr_t) get_end())
+# define STACKBOTTOM ((ptr_t) 0x7fff5fc00000)
+# ifndef USE_MMAP
+# define USE_MMAP
+# endif
+# define USE_MMAP_ANON
+# define MPROTECT_VDB
+# include <unistd.h>
+# define GETPAGESIZE() getpagesize()
+ /* There seems to be some issues with trylock hanging on darwin. */
+ /* This should be looked into some more. */
+# define NO_PTHREAD_TRYLOCK
+# endif
+# ifdef FREEBSD
+# define OS_TYPE "FREEBSD"
+# ifndef GC_FREEBSD_THREADS
+# define MPROTECT_VDB
+# endif
+# ifdef __GLIBC__
+# define SIG_SUSPEND (32+6)
+# define SIG_THR_RESTART (32+5)
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# else
+# define SIG_SUSPEND SIGUSR1
+# define SIG_THR_RESTART SIGUSR2
+# endif
+# define FREEBSD_STACKBOTTOM
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# endif
+ extern char etext[];
+ ptr_t GC_FreeBSDGetDataStart(size_t, ptr_t);
+# define DATASTART GC_FreeBSDGetDataStart(0x1000, (ptr_t)etext)
+# define DATASTART_IS_FUNC
+# endif
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+# ifdef __ELF__
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+# define DYNAMIC_LOADING
+# else
+# define SEARCH_FOR_DATA_START
+# endif
+# endif
+# ifdef SOLARIS
+# define OS_TYPE "SOLARIS"
+# define ELF_CLASS ELFCLASS64
+ extern int _etext[], _end[];
+ ptr_t GC_SysVGetDataStart(size_t, ptr_t);
+# define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
+# define DATASTART_IS_FUNC
+# define DATAEND (ptr_t)(_end)
+/* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
+/* but reportedly breaks under 2.8. It appears that the stack */
+/* base is a property of the executable, so this should not break */
+/* old executables. */
+/* HEURISTIC2 probably works, but this appears to be preferable. */
+/* Apparently USRSTACK is defined to be USERLIMIT, but in some */
+/* installations that's undefined. We work around this with a */
+/* gross hack: */
+# include <sys/vmparam.h>
+# ifdef USERLIMIT
+ /* This should work everywhere, but doesn't. */
+# define STACKBOTTOM ((ptr_t) USRSTACK)
+# else
+# define HEURISTIC2
+# endif
+/* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
+/* It appears to be fixed in 2.8 and 2.9. */
+# ifdef SOLARIS25_PROC_VDB_BUG_FIXED
+# define PROC_VDB
+# endif
+# ifndef GC_THREADS
+# define MPROTECT_VDB
+# endif
+# define DYNAMIC_LOADING
+# if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
+# define USE_MMAP
+ /* Otherwise we now use calloc. Mmap may result in the */
+ /* heap interleaved with thread stacks, which can result in */
+ /* excessive blacklisting. Sbrk is unusable since it */
+ /* doesn't interact correctly with the system malloc. */
+# endif
+# ifdef USE_MMAP
+# define HEAP_START (ptr_t)0x40000000
+# else
+# define HEAP_START DATAEND
+# endif
+# endif
+# ifdef MSWIN32
+# define OS_TYPE "MSWIN32"
+ /* STACKBOTTOM and DATASTART are handled specially in */
+ /* os_dep.c. */
+# if !defined(__GNUC__) || defined(__INTEL_COMPILER)
+ /* GCC does not currently support SetUnhandledExceptionFilter */
+ /* (does not generate SEH unwinding information) on x64. */
+# define MPROTECT_VDB
+# endif
+# define GWW_VDB
+# define DATAEND /* not needed */
+# endif
+# endif /* X86_64 */
+
+# ifdef HEXAGON
+# define CPP_WORDSZ 32
+# define MACH_TYPE "HEXAGON"
+# define ALIGNMENT 4
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# define MPROTECT_VDB
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# include <features.h>
+# if defined(__GLIBC__) && __GLIBC__ >= 2
+# define SEARCH_FOR_DATA_START
+# else
+# error --> unknown Hexagon libc configuration
+# endif
+ extern int _end[];
+# define DATAEND (ptr_t)(_end)
+# else
+# error --> bad Hexagon Linux configuration
+# endif
+# else
+# error --> unknown Hexagon OS configuration
+# endif
+# endif
+
+#if defined(LINUX_STACKBOTTOM) && defined(NO_PROC_STAT) \
+ && !defined(USE_LIBC_PRIVATES)
+ /* This combination will fail, since we have no way to get */
+ /* the stack base. Use HEURISTIC2 instead. */
+# undef LINUX_STACKBOTTOM
+# define HEURISTIC2
+ /* This may still fail on some architectures like IA64. */
+ /* We tried ... */
+#endif
+
+#if defined(LINUX) && defined(USE_MMAP)
+ /* The kernel may do a somewhat better job merging mappings etc. */
+ /* with anonymous mappings. */
+# define USE_MMAP_ANON
+#endif
+
+#if defined(GC_LINUX_THREADS) && defined(REDIRECT_MALLOC) \
+ && !defined(USE_PROC_FOR_LIBRARIES)
+ /* Nptl allocates thread stacks with mmap, which is fine. But it */
+ /* keeps a cache of thread stacks. Thread stacks contain the */
+ /* thread control blocks. These in turn contain a pointer to */
+ /* (sizeof (void *) from the beginning of) the dtv for thread-local */
+ /* storage, which is calloc allocated. If we don't scan the cached */
+ /* thread stacks, we appear to lose the dtv. This tends to */
+ /* result in something that looks like a bogus dtv count, which */
+ /* tends to result in a memset call on a block that is way too */
+ /* large. Sometimes we're lucky and the process just dies ... */
+ /* There seems to be a similar issue with some other memory */
+ /* allocated by the dynamic loader. */
+ /* This should be avoidable by either: */
+ /* - Defining USE_PROC_FOR_LIBRARIES here. */
+ /* That performs very poorly, precisely because we end up */
+ /* scanning cached stacks. */
+ /* - Have calloc look at its callers. */
+ /* In spite of the fact that it is gross and disgusting. */
+ /* In fact neither seems to suffice, probably in part because */
+ /* even with USE_PROC_FOR_LIBRARIES, we don't scan parts of stack */
+ /* segments that appear to be out of bounds. Thus we actually */
+ /* do both, which seems to yield the best results. */
+
+# define USE_PROC_FOR_LIBRARIES
+#endif
+
+#ifndef STACK_GROWS_UP
+# define STACK_GROWS_DOWN
+#endif
+
+#ifndef CPP_WORDSZ
+# define CPP_WORDSZ 32
+#endif
+
+#ifndef OS_TYPE
+# define OS_TYPE ""
+#endif
+
+#ifndef DATAEND
+ extern int end[];
+# define DATAEND (ptr_t)(end)
+#endif
+
+#if defined(PLATFORM_ANDROID) && !defined(THREADS) \
+ && !defined(USE_GET_STACKBASE_FOR_MAIN)
+ /* Always use pthread_attr_getstack on Android ("-lpthread" option is */
+ /* not needed to be specified manually) since GC_linux_main_stack_base */
+ /* causes app crash if invoked inside Dalvik VM. */
+# define USE_GET_STACKBASE_FOR_MAIN
+#endif
+
+#if (defined(SVR4) || defined(PLATFORM_ANDROID)) && !defined(GETPAGESIZE)
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
+#endif
+
+#ifndef GETPAGESIZE
+# if defined(SOLARIS) || defined(IRIX5) || defined(LINUX) \
+ || defined(NETBSD) || defined(FREEBSD) || defined(HPUX)
+# include <unistd.h>
+# endif
+# define GETPAGESIZE() getpagesize()
+#endif
+
+#if defined(SOLARIS) || defined(DRSNX) || defined(UTS4)
+ /* OS has SVR4 generic features. */
+ /* Probably others also qualify. */
+# define SVR4
+#endif
+
+#if defined(SOLARIS) || defined(DRSNX)
+ /* OS has SOLARIS style semi-undocumented interface */
+ /* to dynamic loader. */
+# define SOLARISDL
+ /* OS has SOLARIS style signal handlers. */
+# define SUNOS5SIGS
+#endif
+
+#if defined(HPUX)
+# define SUNOS5SIGS
+#endif
+
+#if defined(FREEBSD) && (defined(__DragonFly__) || __FreeBSD__ >= 4 \
+ || (__FreeBSD_kernel__ >= 4))
+# define SUNOS5SIGS
+#endif
+
+#if !defined(GC_EXPLICIT_SIGNALS_UNBLOCK) && defined(SUNOS5SIGS) \
+ && !defined(GC_NO_PTHREAD_SIGMASK)
+# define GC_EXPLICIT_SIGNALS_UNBLOCK
+#endif
+
+#ifdef GC_NETBSD_THREADS
+# define SIGRTMIN 33
+# define SIGRTMAX 63
+#endif
+
+#if defined(SVR4) || defined(LINUX) || defined(IRIX5) || defined(HPUX) \
+ || defined(OPENBSD) || defined(NETBSD) || defined(FREEBSD) \
+ || defined(DGUX) || defined(BSD) || defined(HURD) \
+ || defined(AIX) || defined(DARWIN) || defined(OSF1)
+# define UNIX_LIKE /* Basic Unix-like system calls work. */
+#endif
+
+#if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
+# error --> bad word size
+#endif
+
+#ifndef ALIGNMENT
+# error --> undefined ALIGNMENT
+#endif
+
+#ifdef PCR
+# undef DYNAMIC_LOADING
+# undef STACKBOTTOM
+# undef HEURISTIC1
+# undef HEURISTIC2
+# undef PROC_VDB
+# undef MPROTECT_VDB
+# define PCR_VDB
+#endif
+
+#if !defined(STACKBOTTOM) && (defined(ECOS) || defined(NOSYS))
+# error --> undefined STACKBOTTOM
+#endif
+
+#ifdef IGNORE_DYNAMIC_LOADING
+# undef DYNAMIC_LOADING
+#endif
+
+#if defined(SMALL_CONFIG) && !defined(GC_DISABLE_INCREMENTAL)
+ /* Presumably not worth the space it takes. */
+# define GC_DISABLE_INCREMENTAL
+#endif
+
+#if defined(GC_DISABLE_INCREMENTAL) || defined(MANUAL_VDB)
+# undef GWW_VDB
+# undef MPROTECT_VDB
+# undef PCR_VDB
+# undef PROC_VDB
+#endif
+
+#ifdef GC_DISABLE_INCREMENTAL
+# undef CHECKSUMS
+#endif
+
+#ifdef USE_GLOBAL_ALLOC
+ /* Cannot pass MEM_WRITE_WATCH to GlobalAlloc(). */
+# undef GWW_VDB
+#endif
+
+#ifdef USE_MUNMAP
+ /* FIXME: Remove this undef if possible. */
+# undef MPROTECT_VDB /* Can't deal with address space holes. */
+#endif
+
+/* PARALLEL_MARK does not cause undef MPROTECT_VDB any longer. */
+
+#if defined(MPROTECT_VDB) && defined(GC_PREFER_MPROTECT_VDB)
+ /* Choose MPROTECT_VDB manually (if multiple strategies available). */
+# undef PCR_VDB
+# undef PROC_VDB
+ /* #undef GWW_VDB - handled in os_dep.c */
+#endif
+
+#ifdef PROC_VDB
+ /* Multi-VDB mode is not implemented. */
+# undef MPROTECT_VDB
+#endif
+
+#if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB) \
+ && !defined(GWW_VDB) && !defined(MANUAL_VDB) \
+ && !defined(GC_DISABLE_INCREMENTAL)
+# define DEFAULT_VDB
+#endif
+
+#if ((defined(UNIX_LIKE) && (defined(DARWIN) || defined(HURD) \
+ || defined(OPENBSD) || defined(ARM32) \
+ || defined(MIPS) || defined(AVR32))) \
+ || (defined(LINUX) && (defined(SPARC) || defined(M68K))) \
+ || (defined(RTEMS) && defined(I386))) && !defined(NO_GETCONTEXT)
+# define NO_GETCONTEXT
+#endif
+
+#ifndef PREFETCH
+# define PREFETCH(x)
+# define NO_PREFETCH
+#endif
+
+#ifndef PREFETCH_FOR_WRITE
+# define PREFETCH_FOR_WRITE(x)
+# define NO_PREFETCH_FOR_WRITE
+#endif
+
+#ifndef CACHE_LINE_SIZE
+# define CACHE_LINE_SIZE 32 /* Wild guess */
+#endif
+
+#ifndef STATIC
+# ifndef NO_DEBUGGING
+# define STATIC /* ignore to aid profiling and possibly debugging */
+# else
+# define STATIC static
+# endif
+#endif
+
+#if defined(LINUX) && (defined(USE_PROC_FOR_LIBRARIES) || defined(IA64) \
+ || !defined(SMALL_CONFIG))
+# define NEED_PROC_MAPS
+#endif
+
+#if defined(LINUX) || defined(HURD) || defined(__GLIBC__)
+# define REGISTER_LIBRARIES_EARLY
+ /* We sometimes use dl_iterate_phdr, which may acquire an internal */
+ /* lock. This isn't safe after the world has stopped. So we must */
+ /* call GC_register_dynamic_libraries before stopping the world. */
+ /* For performance reasons, this may be beneficial on other */
+ /* platforms as well, though it should be avoided in win32. */
+#endif /* LINUX */
+
+#if defined(SEARCH_FOR_DATA_START)
+ extern ptr_t GC_data_start;
+# define DATASTART GC_data_start
+#endif
+
+#ifndef CLEAR_DOUBLE
+# define CLEAR_DOUBLE(x) (((word*)(x))[0] = 0, ((word*)(x))[1] = 0)
+#endif
+
+#if defined(GC_LINUX_THREADS) && defined(REDIRECT_MALLOC) \
+ && !defined(INCLUDE_LINUX_THREAD_DESCR)
+ /* Will not work, since libc and the dynamic loader use thread */
+ /* locals, sometimes as the only reference. */
+# define INCLUDE_LINUX_THREAD_DESCR
+#endif
+
+#if defined(GC_IRIX_THREADS) && !defined(IRIX5)
+# error --> inconsistent configuration
+#endif
+#if defined(GC_LINUX_THREADS) && !defined(LINUX) && !defined(NACL)
+# error --> inconsistent configuration
+#endif
+#if defined(GC_NETBSD_THREADS) && !defined(NETBSD)
+# error --> inconsistent configuration
+#endif
+#if defined(GC_FREEBSD_THREADS) && !defined(FREEBSD)
+# error --> inconsistent configuration
+#endif
+#if defined(GC_SOLARIS_THREADS) && !defined(SOLARIS)
+# error --> inconsistent configuration
+#endif
+#if defined(GC_HPUX_THREADS) && !defined(HPUX)
+# error --> inconsistent configuration
+#endif
+#if defined(GC_AIX_THREADS) && !defined(_AIX)
+# error --> inconsistent configuration
+#endif
+#if defined(GC_GNU_THREADS) && !defined(HURD)
+# error --> inconsistent configuration
+#endif
+#if defined(GC_WIN32_THREADS) && !defined(MSWIN32) && !defined(CYGWIN32) \
+ && !defined(MSWINCE)
+# error --> inconsistent configuration
+#endif
+
+#if defined(PCR) || defined(GC_WIN32_THREADS) || defined(GC_PTHREADS) \
+ || defined(SN_TARGET_PS3)
+# define THREADS
+#endif
+
+#if defined(UNIX_LIKE) && defined(THREADS) && !defined(NO_CANCEL_SAFE) \
+ && !defined(PLATFORM_ANDROID)
+ /* Make the code cancellation-safe. This basically means that we */
+ /* ensure that cancellation requests are ignored while we are in */
+ /* the collector. This applies only to Posix deferred cancellation; */
+ /* we don't handle Posix asynchronous cancellation. */
+ /* Note that this only works if pthread_setcancelstate is */
+ /* async-signal-safe, at least in the absence of asynchronous */
+ /* cancellation. This appears to be true for the glibc version, */
+ /* though it is not documented. Without that assumption, there */
+ /* seems to be no way to safely wait in a signal handler, which */
+ /* we need to do for thread suspension. */
+ /* Also note that little other code appears to be cancellation-safe. */
+ /* Hence it may make sense to turn this off for performance. */
+# define CANCEL_SAFE
+#endif
+
+#ifdef CANCEL_SAFE
+# define IF_CANCEL(x) x
+#else
+# define IF_CANCEL(x) /* empty */
+#endif
+
+#if !defined(CAN_HANDLE_FORK) && !defined(NO_HANDLE_FORK) \
+ && ((defined(GC_PTHREADS) && !defined(HURD) && !defined(NACL) \
+ && !defined(PLATFORM_ANDROID) && !defined(GC_WIN32_PTHREADS)) \
+ || (defined(DARWIN) && defined(MPROTECT_VDB)) || defined(HANDLE_FORK))
+ /* Attempts (where supported and requested) to make GC_malloc work in */
+ /* a child process fork'ed from a multi-threaded parent. */
+# define CAN_HANDLE_FORK
+#endif
+
+#if !defined(USE_MARK_BITS) && !defined(USE_MARK_BYTES) \
+ && defined(PARALLEL_MARK)
+ /* Minimize compare-and-swap usage. */
+# define USE_MARK_BYTES
+#endif
+
+#if defined(MSWINCE) && !defined(__CEGCC__) && !defined(NO_GETENV)
+# define NO_GETENV
+#endif
+
+#if (defined(NO_GETENV) || defined(MSWINCE)) && !defined(NO_GETENV_WIN32)
+# define NO_GETENV_WIN32
+#endif
+
+#ifndef STRTOULL
+# if defined(_WIN64) && !defined(__GNUC__)
+# define STRTOULL _strtoui64
+# elif defined(_LLP64) || defined(__LLP64__) || defined(_WIN64)
+# define STRTOULL strtoull
+# else
+ /* strtoul() fits since sizeof(long) >= sizeof(word). */
+# define STRTOULL strtoul
+# endif
+#endif /* !STRTOULL */
+
+#ifndef GC_WORD_C
+# if defined(_WIN64) && !defined(__GNUC__)
+# define GC_WORD_C(val) val##ui64
+# elif defined(_LLP64) || defined(__LLP64__) || defined(_WIN64)
+# define GC_WORD_C(val) val##ULL
+# else
+# define GC_WORD_C(val) ((word)val##UL)
+# endif
+#endif /* !GC_WORD_C */
+
+#if defined(SPARC)
+# define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
+ /* include assembly code to do it well. */
+#endif
+
+/* Can we save call chain in objects for debugging? */
+/* SET NFRAMES (# of saved frames) and NARGS (#of args for each */
+/* frame) to reasonable values for the platform. */
+/* Set SAVE_CALL_CHAIN if we can. SAVE_CALL_COUNT can be specified */
+/* at build time, though we feel free to adjust it slightly. */
+/* Define NEED_CALLINFO if we either save the call stack or */
+/* GC_ADD_CALLER is defined. */
+/* GC_CAN_SAVE_CALL_STACKS is set in gc.h. */
+#if defined(SPARC)
+# define CAN_SAVE_CALL_ARGS
+#endif
+#if (defined(I386) || defined(X86_64)) \
+ && (defined(LINUX) || defined(__GLIBC__))
+ /* SAVE_CALL_CHAIN is supported if the code is compiled to save */
+ /* frame pointers by default, i.e. no -fomit-frame-pointer flag. */
+# define CAN_SAVE_CALL_ARGS
+#endif
+
+#if defined(SAVE_CALL_COUNT) && !defined(GC_ADD_CALLER) \
+ && defined(GC_CAN_SAVE_CALL_STACKS)
+# define SAVE_CALL_CHAIN
+#endif
+#ifdef SAVE_CALL_CHAIN
+# if defined(SAVE_CALL_NARGS) && defined(CAN_SAVE_CALL_ARGS)
+# define NARGS SAVE_CALL_NARGS
+# else
+# define NARGS 0 /* Number of arguments to save for each call. */
+# endif
+#endif
+#ifdef SAVE_CALL_CHAIN
+# ifndef SAVE_CALL_COUNT
+# define NFRAMES 6 /* Number of frames to save. Even for */
+ /* alignment reasons. */
+# else
+# define NFRAMES ((SAVE_CALL_COUNT + 1) & ~1)
+# endif
+# define NEED_CALLINFO
+#endif /* SAVE_CALL_CHAIN */
+#ifdef GC_ADD_CALLER
+# define NFRAMES 1
+# define NARGS 0
+# define NEED_CALLINFO
+#endif
+
+#if defined(MAKE_BACK_GRAPH) && !defined(DBG_HDRS_ALL)
+# define DBG_HDRS_ALL
+#endif
+
+#if defined(POINTER_MASK) && !defined(POINTER_SHIFT)
+# define POINTER_SHIFT 0
+#endif
+
+#if defined(POINTER_SHIFT) && !defined(POINTER_MASK)
+# define POINTER_MASK ((GC_word)(-1))
+#endif
+
+#if !defined(FIXUP_POINTER) && defined(POINTER_MASK)
+# define FIXUP_POINTER(p) (p = ((p) & POINTER_MASK) << POINTER_SHIFT)
+#endif
+
+#if defined(FIXUP_POINTER)
+# define NEED_FIXUP_POINTER 1
+#else
+# define NEED_FIXUP_POINTER 0
+# define FIXUP_POINTER(p)
+#endif
+
+#if !defined(MARK_BIT_PER_GRANULE) && !defined(MARK_BIT_PER_OBJ)
+# define MARK_BIT_PER_GRANULE /* Usually faster */
+#endif
+
+/* Some static sanity tests. */
+#if defined(MARK_BIT_PER_GRANULE) && defined(MARK_BIT_PER_OBJ)
+# error Define only one of MARK_BIT_PER_GRANULE and MARK_BIT_PER_OBJ.
+#endif
+
+#if defined(STACK_GROWS_UP) && defined(STACK_GROWS_DOWN)
+# error "Only one of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd."
+#endif
+#if !defined(STACK_GROWS_UP) && !defined(STACK_GROWS_DOWN)
+# error "One of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd."
+#endif
+
+#if defined(REDIRECT_MALLOC) && defined(THREADS) && !defined(LINUX)
+# error "REDIRECT_MALLOC with THREADS works at most on Linux."
+#endif
+
+#ifdef GC_PRIVATE_H
+ /* This relies on some type definitions from gc_priv.h, from */
+ /* where it's normally included. */
+ /* */
+ /* How to get heap memory from the OS: */
+ /* Note that sbrk()-like allocation is preferred, since it */
+ /* usually makes it possible to merge consecutively allocated */
+ /* chunks. It also avoids unintended recursion with */
+ /* REDIRECT_MALLOC macro defined. */
+ /* GET_MEM() returns a HLKSIZE aligned chunk. */
+ /* 0 is taken to mean failure. */
+ /* In the case os USE_MMAP, the argument must also be a */
+ /* physical page size. */
+ /* GET_MEM is currently not assumed to retrieve 0 filled space, */
+ /* though we should perhaps take advantage of the case in which */
+ /* does. */
+ struct hblk; /* See gc_priv.h. */
+# if defined(PCR)
+ char * real_malloc(size_t bytes);
+# define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)(bytes) + GC_page_size) \
+ + GC_page_size-1)
+# elif defined(OS2)
+ void * os2_alloc(size_t bytes);
+# define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)(bytes) \
+ + GC_page_size) + GC_page_size-1)
+# elif defined(NEXT) || defined(DOS4GW) || defined(NONSTOP) \
+ || (defined(AMIGA) && !defined(GC_AMIGA_FASTALLOC)) \
+ || (defined(SOLARIS) && !defined(USE_MMAP)) || defined(RTEMS) \
+ || defined(__CC_ARM)
+# define GET_MEM(bytes) HBLKPTR((size_t)calloc(1, \
+ (size_t)(bytes) + GC_page_size) \
+ + GC_page_size - 1)
+# elif defined(MSWIN32) || defined(CYGWIN32)
+ ptr_t GC_win32_get_mem(GC_word bytes);
+# define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
+# elif defined(MACOS)
+# if defined(USE_TEMPORARY_MEMORY)
+ Ptr GC_MacTemporaryNewPtr(size_t size, Boolean clearMemory);
+# define GET_MEM(bytes) HBLKPTR( \
+ GC_MacTemporaryNewPtr((bytes) + GC_page_size, true) \
+ + GC_page_size-1)
+# else
+# define GET_MEM(bytes) HBLKPTR(NewPtrClear((bytes) + GC_page_size) \
+ + GC_page_size-1)
+# endif
+# elif defined(MSWINCE)
+ ptr_t GC_wince_get_mem(GC_word bytes);
+# define GET_MEM(bytes) (struct hblk *)GC_wince_get_mem(bytes)
+# elif defined(AMIGA) && defined(GC_AMIGA_FASTALLOC)
+ void *GC_amiga_get_mem(size_t size);
+# define GET_MEM(bytes) HBLKPTR((size_t) \
+ GC_amiga_get_mem((size_t)(bytes) + GC_page_size) \
+ + GC_page_size-1)
+# elif defined(SN_TARGET_PS3)
+ void *ps3_get_mem(size_t size);
+# define GET_MEM(bytes) (struct hblk*)ps3_get_mem(bytes)
+# else
+ ptr_t GC_unix_get_mem(GC_word bytes);
+# define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
+# endif
+#endif /* GC_PRIVATE_H */
+
+#endif /* GCCONFIG_H */
projects / hs-boehmgc.git / blobdiff