Quelle misc.c Sprache: C

/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
* Copyright (c) 1999-2001 by Hewlett-Packard Company. All rights reserved.
* Copyright (c) 2008-2021 Ivan Maidanski
*
* 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.
*/

#include "private/gc_pmark.h"

#include <stdio.h>
#include <limits.h>
#include <stdarg.h>

#ifndef MSWINCE
# include <signal.h>
#endif

#ifdef GC_SOLARIS_THREADS
# include <sys/syscall.h>
#endif

#if defined(UNIX_LIKE) || defined(CYGWIN32) || defined(SYMBIAN) \
    || (defined(CONSOLE_LOG) && defined(MSWIN32))
# include <fcntl.h>
# include <sys/types.h>
# include <sys/stat.h>
#endif

#if defined(CONSOLE_LOG) && defined(MSWIN32) && !defined(__GNUC__)
# include <io.h>
#endif

#ifdef NONSTOP
# include <floss.h>
#endif

#ifdef THREADS
# ifdef PCR
#   include "il/PCR_IL.h"
    GC_INNER PCR_Th_ML GC_allocate_ml;
# elif defined(SN_TARGET_PSP2)
    GC_INNER WapiMutex GC_allocate_ml_PSP2 = { 0, NULL };
# elif defined(GC_DEFN_ALLOCATE_ML) || defined(SN_TARGET_PS3)
#   include <pthread.h>
    GC_INNER pthread_mutex_t GC_allocate_ml;
# endif
  /* For other platforms with threads, the lock and possibly            */
  /* GC_lock_holder variables are defined in the thread support code.   */
#endif /* THREADS */

#ifdef DYNAMIC_LOADING
  /* We need to register the main data segment.  Returns  TRUE unless   */
  /* this is done implicitly as part of dynamic library registration.   */
# define GC_REGISTER_MAIN_STATIC_DATA() GC_register_main_static_data()
#elif defined(GC_DONT_REGISTER_MAIN_STATIC_DATA)
# define GC_REGISTER_MAIN_STATIC_DATA() FALSE
#else
  /* Don't unnecessarily call GC_register_main_static_data() in case    */
  /* dyn_load.c isn't linked in.                                        */
# define GC_REGISTER_MAIN_STATIC_DATA() TRUE
#endif

#ifdef NEED_CANCEL_DISABLE_COUNT
  __thread unsigned char GC_cancel_disable_count = 0;
#endif

GC_FAR struct _GC_arrays GC_arrays /* = { 0 } */;

GC_INNER unsigned GC_n_mark_procs = GC_RESERVED_MARK_PROCS;

GC_INNER unsigned GC_n_kinds = GC_N_KINDS_INITIAL_VALUE;

GC_INNER GC_bool GC_debugging_started = FALSE;
                /* defined here so we don't have to load dbg_mlc.o */

ptr_t GC_stackbottom = 0;

#ifdef IA64
  ptr_t GC_register_stackbottom = 0;
#endif

int GC_dont_gc = FALSE;

int GC_dont_precollect = FALSE;

GC_bool GC_quiet = 0; /* used also in pcr_interface.c */

#if !defined(NO_CLOCK) || !defined(SMALL_CONFIG)
  int GC_print_stats = 0;
#endif

#ifdef GC_PRINT_BACK_HEIGHT
  GC_INNER GC_bool GC_print_back_height = TRUE;
#else
  GC_INNER GC_bool GC_print_back_height = FALSE;
#endif

#ifndef NO_DEBUGGING
# ifdef GC_DUMP_REGULARLY
    GC_INNER GC_bool GC_dump_regularly = TRUE;
                                /* Generate regular debugging dumps. */
# else
    GC_INNER GC_bool GC_dump_regularly = FALSE;
# endif
# ifndef NO_CLOCK
    STATIC CLOCK_TYPE GC_init_time;
                /* The time that the GC was initialized at.     */
# endif
#endif /* !NO_DEBUGGING */

#ifdef KEEP_BACK_PTRS
  GC_INNER long GC_backtraces = 0;
                /* Number of random backtraces to generate for each GC. */
#endif

#ifdef FIND_LEAK
  int GC_find_leak = 1;
#else
  int GC_find_leak = 0;
#endif

#ifndef SHORT_DBG_HDRS
# ifdef GC_FINDLEAK_DELAY_FREE
    GC_INNER GC_bool GC_findleak_delay_free = TRUE;
# else
    GC_INNER GC_bool GC_findleak_delay_free = FALSE;
# endif
#endif /* !SHORT_DBG_HDRS */

#ifdef ALL_INTERIOR_POINTERS
  int GC_all_interior_pointers = 1;
#else
  int GC_all_interior_pointers = 0;
#endif

#ifdef FINALIZE_ON_DEMAND
  int GC_finalize_on_demand = 1;
#else
  int GC_finalize_on_demand = 0;
#endif

#ifdef JAVA_FINALIZATION
  int GC_java_finalization = 1;
#else
  int GC_java_finalization = 0;
#endif

/* All accesses to it should be synchronized to avoid data races.       */
GC_finalizer_notifier_proc GC_finalizer_notifier =
                                        (GC_finalizer_notifier_proc)0;

#ifdef GC_FORCE_UNMAP_ON_GCOLLECT
  /* Has no effect unless USE_MUNMAP.                           */
  /* Has no effect on implicitly-initiated garbage collections. */
  GC_INNER GC_bool GC_force_unmap_on_gcollect = TRUE;
#else
  GC_INNER GC_bool GC_force_unmap_on_gcollect = FALSE;
#endif

#ifndef GC_LARGE_ALLOC_WARN_INTERVAL
# define GC_LARGE_ALLOC_WARN_INTERVAL 5
#endif
GC_INNER long GC_large_alloc_warn_interval = GC_LARGE_ALLOC_WARN_INTERVAL;
                        /* Interval between unsuppressed warnings.      */

STATIC void * GC_CALLBACK GC_default_oom_fn(
                                        size_t bytes_requested GC_ATTR_UNUSED)
{
    return(0);
}

/* All accesses to it should be synchronized to avoid data races.       */
GC_oom_func GC_oom_fn = GC_default_oom_fn;

#ifdef CAN_HANDLE_FORK
# ifdef HANDLE_FORK
    GC_INNER int GC_handle_fork = 1;
                        /* The value is examined by GC_thr_init.        */
# else
    GC_INNER int GC_handle_fork = FALSE;
# endif

#elif !defined(HAVE_NO_FORK)
  GC_API void GC_CALL GC_atfork_prepare(void)
  {
#   ifdef THREADS
      ABORT("fork() handling unsupported");
#   endif
  }

  GC_API void GC_CALL GC_atfork_parent(void)
  {
    /* empty */
  }

  GC_API void GC_CALL GC_atfork_child(void)
  {
    /* empty */
  }
#endif /* !CAN_HANDLE_FORK && !HAVE_NO_FORK */

/* Overrides the default automatic handle-fork mode.  Has effect only   */
/* if called before GC_INIT.                                            */
GC_API void GC_CALL GC_set_handle_fork(int value GC_ATTR_UNUSED)
{
# ifdef CAN_HANDLE_FORK
    if (!GC_is_initialized)
      GC_handle_fork = value >= -1 ? value : 1;
                /* Map all negative values except for -1 to a positive one. */
# elif defined(THREADS) || (defined(DARWIN) && defined(MPROTECT_VDB))
    if (!GC_is_initialized && value) {
#     ifndef SMALL_CONFIG
        GC_init(); /* to initialize GC_manual_vdb and GC_stderr */
#       ifndef THREADS
          if (GC_manual_vdb)
            return;
#       endif
#     endif
      ABORT("fork() handling unsupported");
    }
# else
    /* No at-fork handler is needed in the single-threaded mode.        */
# endif
}

/* Set things up so that GC_size_map[i] >= granules(i),                 */
/* but not too much bigger                                              */
/* and so that size_map contains relatively few distinct entries        */
/* This was originally stolen from Russ Atkinson's Cedar                */
/* quantization algorithm (but we precompute it).                       */
STATIC void GC_init_size_map(void)
{
    size_t i;

    /* Map size 0 to something bigger.                  */
    /* This avoids problems at lower levels.            */
      GC_size_map[0] = 1;
    for (i = 1; i <= GRANULES_TO_BYTES(TINY_FREELISTS-1) - EXTRA_BYTES; i++) {
        GC_size_map[i] = ROUNDED_UP_GRANULES(i);
#       ifndef _MSC_VER
          GC_ASSERT(GC_size_map[i] < TINY_FREELISTS);
          /* Seems to tickle bug in VC++ 2008 for AMD64 */
#       endif
    }
    /* We leave the rest of the array to be filled in on demand. */
}

/*
* The following is a gross hack to deal with a problem that can occur
* on machines that are sloppy about stack frame sizes, notably SPARC.
* Bogus pointers may be written to the stack and not cleared for
* a LONG time, because they always fall into holes in stack frames
* that are not written.  We partially address this by clearing
* sections of the stack whenever we get control.
*/

#ifndef SMALL_CLEAR_SIZE
# define SMALL_CLEAR_SIZE 256   /* Clear this much every time.  */
#endif

#if defined(ALWAYS_SMALL_CLEAR_STACK) || defined(STACK_NOT_SCANNED)
  GC_API void * GC_CALL GC_clear_stack(void *arg)
  {
#   ifndef STACK_NOT_SCANNED
      word volatile dummy[SMALL_CLEAR_SIZE];
      BZERO((/* no volatile */ void *)dummy, sizeof(dummy));
#   endif
    return arg;
  }
#else

# ifdef THREADS
#   define BIG_CLEAR_SIZE 2048  /* Clear this much now and then.        */
# else
    STATIC word GC_stack_last_cleared = 0; /* GC_no when we last did this */
    STATIC ptr_t GC_min_sp = NULL;
                        /* Coolest stack pointer value from which       */
                        /* we've already cleared the stack.             */
    STATIC ptr_t GC_high_water = NULL;
                        /* "hottest" stack pointer value we have seen   */
                        /* recently.  Degrades over time.               */
    STATIC word GC_bytes_allocd_at_reset = 0;
#   define DEGRADE_RATE 50
# endif

# if defined(ASM_CLEAR_CODE)
    void *GC_clear_stack_inner(void *, ptr_t);
# else
    /* Clear the stack up to about limit.  Return arg.  This function   */
    /* is not static because it could also be erroneously defined in .S */
    /* file, so this error would be caught by the linker.               */
    void *GC_clear_stack_inner(void *arg,
#                           if defined(__APPLE_CC__) && !GC_CLANG_PREREQ(6, 0)
                               volatile /* to workaround some bug */
#                           endif
                               ptr_t limit)
    {
#     define CLEAR_SIZE 213 /* granularity */
      volatile word dummy[CLEAR_SIZE];

      BZERO((/* no volatile */ void *)dummy, sizeof(dummy));
      if ((word)GC_approx_sp() COOLER_THAN (word)limit) {
        (void)GC_clear_stack_inner(arg, limit);
      }
      /* Make sure the recursive call is not a tail call, and the bzero */
      /* call is not recognized as dead code.                           */
#     if defined(CPPCHECK)
        GC_noop1(dummy[0]);
#     else
        GC_noop1(COVERT_DATAFLOW(dummy));
#     endif
      return(arg);
    }
# endif /* !ASM_CLEAR_CODE */

# ifdef THREADS
    /* Used to occasionally clear a bigger chunk.       */
    /* TODO: Should be more random than it is ...       */
    GC_ATTR_NO_SANITIZE_THREAD
    static unsigned next_random_no(void)
    {
      static unsigned random_no = 0;
      return ++random_no % 13;
    }
# endif /* THREADS */

/* Clear some of the inaccessible part of the stack.  Returns its       */
/* argument, so it can be used in a tail call position, hence clearing  */
/* another frame.                                                       */
  GC_API void * GC_CALL GC_clear_stack(void *arg)
  {
    ptr_t sp = GC_approx_sp();  /* Hotter than actual sp */
#   ifdef THREADS
        word volatile dummy[SMALL_CLEAR_SIZE];
#   endif

#   define SLOP 400
        /* Extra bytes we clear every time.  This clears our own        */
        /* activation record, and should cause more frequent            */
        /* clearing near the cold end of the stack, a good thing.       */
#   define GC_SLOP 4000
        /* We make GC_high_water this much hotter than we really saw    */
        /* it, to cover for GC noise etc. above our current frame.      */
#   define CLEAR_THRESHOLD 100000
        /* We restart the clearing process after this many bytes of     */
        /* allocation.  Otherwise very heavily recursive programs       */
        /* with sparse stacks may result in heaps that grow almost      */
        /* without bounds.  As the heap gets larger, collection         */
        /* frequency decreases, thus clearing frequency would decrease, */
        /* thus more junk remains accessible, thus the heap gets        */
        /* larger ...                                                   */
#   ifdef THREADS
      if (next_random_no() == 0) {
        ptr_t limit = sp;

        MAKE_HOTTER(limit, BIG_CLEAR_SIZE*sizeof(word));
        limit = (ptr_t)((word)limit & ~0xf);
                        /* Make it sufficiently aligned for assembly    */
                        /* implementations of GC_clear_stack_inner.     */
        return GC_clear_stack_inner(arg, limit);
      }
      BZERO((void *)dummy, SMALL_CLEAR_SIZE*sizeof(word));
#   else
      if (GC_gc_no > GC_stack_last_cleared) {
        /* Start things over, so we clear the entire stack again */
        if (GC_stack_last_cleared == 0)
          GC_high_water = (ptr_t)GC_stackbottom;
        GC_min_sp = GC_high_water;
        GC_stack_last_cleared = GC_gc_no;
        GC_bytes_allocd_at_reset = GC_bytes_allocd;
      }
      /* Adjust GC_high_water */
      MAKE_COOLER(GC_high_water, WORDS_TO_BYTES(DEGRADE_RATE) + GC_SLOP);
      if ((word)sp HOTTER_THAN (word)GC_high_water) {
          GC_high_water = sp;
      }
      MAKE_HOTTER(GC_high_water, GC_SLOP);
      {
        ptr_t limit = GC_min_sp;

        MAKE_HOTTER(limit, SLOP);
        if ((word)sp COOLER_THAN (word)limit) {
          limit = (ptr_t)((word)limit & ~0xf);
                          /* Make it sufficiently aligned for assembly  */
                          /* implementations of GC_clear_stack_inner.   */
          GC_min_sp = sp;
          return GC_clear_stack_inner(arg, limit);
        }
      }
      if (GC_bytes_allocd - GC_bytes_allocd_at_reset > CLEAR_THRESHOLD) {
        /* Restart clearing process, but limit how much clearing we do. */
        GC_min_sp = sp;
        MAKE_HOTTER(GC_min_sp, CLEAR_THRESHOLD/4);
        if ((word)GC_min_sp HOTTER_THAN (word)GC_high_water)
          GC_min_sp = GC_high_water;
        GC_bytes_allocd_at_reset = GC_bytes_allocd;
      }
#   endif
    return arg;
  }

#endif /* !ALWAYS_SMALL_CLEAR_STACK && !STACK_NOT_SCANNED */

/* Return a pointer to the base address of p, given a pointer to a      */
/* an address within an object.  Return 0 o.w.                          */
GC_API void * GC_CALL GC_base(void * p)
{
    ptr_t r;
    struct hblk *h;
    bottom_index *bi;
    hdr *candidate_hdr;

    r = (ptr_t)p;
    if (!EXPECT(GC_is_initialized, TRUE)) return 0;
    h = HBLKPTR(r);
    GET_BI(r, bi);
    candidate_hdr = HDR_FROM_BI(bi, r);
    if (candidate_hdr == 0) return(0);
    /* If it's a pointer to the middle of a large object, move it       */
    /* to the beginning.                                                */
        while (IS_FORWARDING_ADDR_OR_NIL(candidate_hdr)) {
           h = FORWARDED_ADDR(h,candidate_hdr);
           r = (ptr_t)h;
           candidate_hdr = HDR(h);
        }
    if (HBLK_IS_FREE(candidate_hdr)) return(0);
    /* Make sure r points to the beginning of the object */
        r = (ptr_t)((word)r & ~(WORDS_TO_BYTES(1) - 1));
        {
            size_t offset = HBLKDISPL(r);
            word sz = candidate_hdr -> hb_sz;
            size_t obj_displ = offset % sz;
            ptr_t limit;

            r -= obj_displ;
            limit = r + sz;
            if ((word)limit > (word)(h + 1) && sz <= HBLKSIZE) {
                return(0);
            }
            if ((word)p >= (word)limit) return(0);
        }
    return((void *)r);
}

/* Return TRUE if and only if p points to somewhere in GC heap. */
GC_API int GC_CALL GC_is_heap_ptr(const void *p)
{
    bottom_index *bi;

    GC_ASSERT(GC_is_initialized);
    GET_BI(p, bi);
    return HDR_FROM_BI(bi, p) != 0;
}

/* Return the size of an object, given a pointer to its base.           */
/* (For small objects this also happens to work from interior pointers, */
/* but that shouldn't be relied upon.)                                  */
GC_API size_t GC_CALL GC_size(const void * p)
{
    hdr * hhdr = HDR(p);

    return (size_t)hhdr->hb_sz;
}

/* These getters remain unsynchronized for compatibility (since some    */
/* clients could call some of them from a GC callback holding the       */
/* allocator lock).                                                     */
GC_API size_t GC_CALL GC_get_heap_size(void)
{
    /* ignore the memory space returned to OS (i.e. count only the      */
    /* space owned by the garbage collector)                            */
    return (size_t)(GC_heapsize - GC_unmapped_bytes);
}

GC_API size_t GC_CALL GC_get_obtained_from_os_bytes(void)
{
    return (size_t)GC_our_mem_bytes;
}

GC_API size_t GC_CALL GC_get_free_bytes(void)
{
    /* ignore the memory space returned to OS */
    return (size_t)(GC_large_free_bytes - GC_unmapped_bytes);
}

GC_API size_t GC_CALL GC_get_unmapped_bytes(void)
{
    return (size_t)GC_unmapped_bytes;
}

GC_API size_t GC_CALL GC_get_bytes_since_gc(void)
{
    return (size_t)GC_bytes_allocd;
}

GC_API size_t GC_CALL GC_get_total_bytes(void)
{
    return (size_t)(GC_bytes_allocd + GC_bytes_allocd_before_gc);
}

#ifndef GC_GET_HEAP_USAGE_NOT_NEEDED

GC_API size_t GC_CALL GC_get_size_map_at(int i)
{
  if ((unsigned)i > MAXOBJBYTES)
    return GC_SIZE_MAX;
  return GRANULES_TO_BYTES(GC_size_map[i]);
}

/* Return the heap usage information.  This is a thread-safe (atomic)   */
/* alternative for the five above getters.  NULL pointer is allowed for */
/* any argument.  Returned (filled in) values are of word type.         */
GC_API void GC_CALL GC_get_heap_usage_safe(GC_word *pheap_size,
                        GC_word *pfree_bytes, GC_word *punmapped_bytes,
                        GC_word *pbytes_since_gc, GC_word *ptotal_bytes)
{
  DCL_LOCK_STATE;

  LOCK();
  if (pheap_size != NULL)
    *pheap_size = GC_heapsize - GC_unmapped_bytes;
  if (pfree_bytes != NULL)
    *pfree_bytes = GC_large_free_bytes - GC_unmapped_bytes;
  if (punmapped_bytes != NULL)
    *punmapped_bytes = GC_unmapped_bytes;
  if (pbytes_since_gc != NULL)
    *pbytes_since_gc = GC_bytes_allocd;
  if (ptotal_bytes != NULL)
    *ptotal_bytes = GC_bytes_allocd + GC_bytes_allocd_before_gc;
  UNLOCK();
}

  GC_INNER word GC_reclaimed_bytes_before_gc = 0;

  /* Fill in GC statistics provided the destination is of enough size.  */
  static void fill_prof_stats(struct GC_prof_stats_s *pstats)
  {
    pstats->heapsize_full = GC_heapsize;
    pstats->free_bytes_full = GC_large_free_bytes;
    pstats->unmapped_bytes = GC_unmapped_bytes;
    pstats->bytes_allocd_since_gc = GC_bytes_allocd;
    pstats->allocd_bytes_before_gc = GC_bytes_allocd_before_gc;
    pstats->non_gc_bytes = GC_non_gc_bytes;
    pstats->gc_no = GC_gc_no; /* could be -1 */
#   ifdef PARALLEL_MARK
      pstats->markers_m1 = (word)((signed_word)GC_markers_m1);
#   else
      pstats->markers_m1 = 0; /* one marker */
#   endif
    pstats->bytes_reclaimed_since_gc = GC_bytes_found > 0 ?
                                        (word)GC_bytes_found : 0;
    pstats->reclaimed_bytes_before_gc = GC_reclaimed_bytes_before_gc;
    pstats->expl_freed_bytes_since_gc = GC_bytes_freed; /* since gc-7.7 */
    pstats->obtained_from_os_bytes = GC_our_mem_bytes; /* since gc-8.2 */
  }

# include <string.h> /* for memset() */

  GC_API size_t GC_CALL GC_get_prof_stats(struct GC_prof_stats_s *pstats,
                                          size_t stats_sz)
  {
    struct GC_prof_stats_s stats;
    DCL_LOCK_STATE;

    LOCK();
    fill_prof_stats(stats_sz >= sizeof(stats) ? pstats : &stats);
    UNLOCK();

    if (stats_sz == sizeof(stats)) {
      return sizeof(stats);
    } else if (stats_sz > sizeof(stats)) {
      /* Fill in the remaining part with -1.    */
      memset((char *)pstats + sizeof(stats), 0xff, stats_sz - sizeof(stats));
      return sizeof(stats);
    } else {
      if (EXPECT(stats_sz > 0, TRUE))
        BCOPY(&stats, pstats, stats_sz);
      return stats_sz;
    }
  }

# ifdef THREADS
    /* The _unsafe version assumes the caller holds the allocation lock. */
    GC_API size_t GC_CALL GC_get_prof_stats_unsafe(
                                            struct GC_prof_stats_s *pstats,
                                            size_t stats_sz)
    {
      struct GC_prof_stats_s stats;

      if (stats_sz >= sizeof(stats)) {
        fill_prof_stats(pstats);
        if (stats_sz > sizeof(stats))
          memset((char *)pstats + sizeof(stats), 0xff,
                 stats_sz - sizeof(stats));
        return sizeof(stats);
      } else {
        if (EXPECT(stats_sz > 0, TRUE)) {
          fill_prof_stats(&stats);
          BCOPY(&stats, pstats, stats_sz);
        }
        return stats_sz;
      }
    }
# endif /* THREADS */

#endif /* !GC_GET_HEAP_USAGE_NOT_NEEDED */

#if defined(GC_DARWIN_THREADS) || defined(GC_OPENBSD_UTHREADS) \
    || defined(GC_WIN32_THREADS) || (defined(NACL) && defined(THREADS))
  /* GC does not use signals to suspend and restart threads.    */
  GC_API void GC_CALL GC_set_suspend_signal(int sig GC_ATTR_UNUSED)
  {
    /* empty */
  }

  GC_API void GC_CALL GC_set_thr_restart_signal(int sig GC_ATTR_UNUSED)
  {
    /* empty */
  }

  GC_API int GC_CALL GC_get_suspend_signal(void)
  {
    return -1;
  }

  GC_API int GC_CALL GC_get_thr_restart_signal(void)
  {
    return -1;
  }
#endif /* GC_DARWIN_THREADS || GC_WIN32_THREADS || ... */

#if !defined(_MAX_PATH) && (defined(MSWIN32) || defined(MSWINCE) \
                            || defined(CYGWIN32))
# define _MAX_PATH MAX_PATH
#endif

#ifdef GC_READ_ENV_FILE
  /* This works for Win32/WinCE for now.  Really useful only for WinCE. */
  STATIC char *GC_envfile_content = NULL;
                        /* The content of the GC "env" file with CR and */
                        /* LF replaced to '\0'.  NULL if the file is    */
                        /* missing or empty.  Otherwise, always ends    */
                        /* with '\0'.                                   */
  STATIC unsigned GC_envfile_length = 0;
                        /* Length of GC_envfile_content (if non-NULL).  */

# ifndef GC_ENVFILE_MAXLEN
#   define GC_ENVFILE_MAXLEN 0x4000
# endif

# define GC_ENV_FILE_EXT ".gc.env"

  /* The routine initializes GC_envfile_content from the GC "env" file. */
  STATIC void GC_envfile_init(void)
  {
#   if defined(MSWIN32) || defined(MSWINCE) || defined(CYGWIN32)
      HANDLE hFile;
      char *content;
      unsigned ofs;
      unsigned len;
      DWORD nBytesRead;
      TCHAR path[_MAX_PATH + 0x10]; /* buffer for path + ext */
      size_t bytes_to_get;

      len = (unsigned)GetModuleFileName(NULL /* hModule */, path,
                                        _MAX_PATH + 1);
      /* If GetModuleFileName() has failed then len is 0. */
      if (len > 4 && path[len - 4] == (TCHAR)'.') {
        len -= 4; /* strip executable file extension */
      }
      BCOPY(TEXT(GC_ENV_FILE_EXT), &path[len], sizeof(TEXT(GC_ENV_FILE_EXT)));
      hFile = CreateFile(path, GENERIC_READ,
                         FILE_SHARE_READ | FILE_SHARE_WRITE,
                         NULL /* lpSecurityAttributes */, OPEN_EXISTING,
                         FILE_ATTRIBUTE_NORMAL, NULL /* hTemplateFile */);
      if (hFile == INVALID_HANDLE_VALUE)
        return; /* the file is absent or the operation is failed */
      len = (unsigned)GetFileSize(hFile, NULL);
      if (len <= 1 || len >= GC_ENVFILE_MAXLEN) {
        CloseHandle(hFile);
        return; /* invalid file length - ignoring the file content */
      }
      /* At this execution point, GC_setpagesize() and GC_init_win32()  */
      /* must already be called (for GET_MEM() to work correctly).      */
      GC_ASSERT(GC_page_size != 0);
      bytes_to_get = ROUNDUP_PAGESIZE_IF_MMAP((size_t)len + 1);
      content = (char *)GET_MEM(bytes_to_get);
      if (content == NULL) {
        CloseHandle(hFile);
        return; /* allocation failure */
      }
      GC_add_to_our_memory(content, bytes_to_get);
      ofs = 0;
      nBytesRead = (DWORD)-1L;
          /* Last ReadFile() call should clear nBytesRead on success. */
      while (ReadFile(hFile, content + ofs, len - ofs + 1, &nBytesRead,
                      NULL /* lpOverlapped */) && nBytesRead != 0) {
        if ((ofs += nBytesRead) > len)
          break;
      }
      CloseHandle(hFile);
      if (ofs != len || nBytesRead != 0) {
        /* TODO: recycle content */
        return; /* read operation is failed - ignoring the file content */
      }
      content[ofs] = '\0';
      while (ofs-- > 0) {
       if (content[ofs] == '\r' || content[ofs] == '\n')
         content[ofs] = '\0';
      }
      GC_ASSERT(NULL == GC_envfile_content);
      GC_envfile_length = len + 1;
      GC_envfile_content = content;
#   endif
  }

  /* This routine scans GC_envfile_content for the specified            */
  /* environment variable (and returns its value if found).             */
  GC_INNER char * GC_envfile_getenv(const char *name)
  {
    char *p;
    char *end_of_content;
    size_t namelen;

#   ifndef NO_GETENV
      p = getenv(name); /* try the standard getenv() first */
      if (p != NULL)
        return *p != '\0' ? p : NULL;
#   endif
    p = GC_envfile_content;
    if (p == NULL)
      return NULL; /* "env" file is absent (or empty) */
    namelen = strlen(name);
    if (namelen == 0) /* a sanity check */
      return NULL;
    for (end_of_content = p + GC_envfile_length;
         p != end_of_content; p += strlen(p) + 1) {
      if (strncmp(p, name, namelen) == 0 && *(p += namelen) == '=') {
        p++; /* the match is found; skip '=' */
        return *p != '\0' ? p : NULL;
      }
      /* If not matching then skip to the next line. */
    }
    return NULL; /* no match found */
  }
#endif /* GC_READ_ENV_FILE */

GC_INNER GC_bool GC_is_initialized = FALSE;

GC_API int GC_CALL GC_is_init_called(void)
{
  return GC_is_initialized;
}

#if defined(GC_WIN32_THREADS) \
    && ((defined(MSWIN32) && !defined(CONSOLE_LOG)) || defined(MSWINCE))
  GC_INNER CRITICAL_SECTION GC_write_cs;
#endif

#ifndef DONT_USE_ATEXIT
# if !defined(PCR) && !defined(SMALL_CONFIG)
    /* A dedicated variable to avoid a garbage collection on abort.     */
    /* GC_find_leak cannot be used for this purpose as otherwise        */
    /* TSan finds a data race (between GC_default_on_abort and, e.g.,   */
    /* GC_finish_collection).                                           */
    static GC_bool skip_gc_atexit = FALSE;
# else
#   define skip_gc_atexit FALSE
# endif

  STATIC void GC_exit_check(void)
  {
    if (GC_find_leak && !skip_gc_atexit) {
#     ifdef THREADS
        GC_in_thread_creation = TRUE; /* OK to collect from unknown thread. */
        GC_gcollect();
        GC_in_thread_creation = FALSE;
#     else
        GC_gcollect();
#     endif
    }
  }
#endif

#if defined(UNIX_LIKE) && !defined(NO_DEBUGGING)
  static void looping_handler(int sig)
  {
    GC_err_printf("Caught signal %d: looping in handler\n", sig);
    for (;;) {
       /* empty */
    }
  }

  static GC_bool installed_looping_handler = FALSE;

  static void maybe_install_looping_handler(void)
  {
    /* Install looping handler before the write fault handler, so we    */
    /* handle write faults correctly.                                   */
    if (!installed_looping_handler && 0 != GETENV("GC_LOOP_ON_ABORT")) {
      GC_set_and_save_fault_handler(looping_handler);
      installed_looping_handler = TRUE;
    }
  }

#else /* !UNIX_LIKE */
# define maybe_install_looping_handler()
#endif

#define GC_DEFAULT_STDOUT_FD 1
#define GC_DEFAULT_STDERR_FD 2

#if !defined(OS2) && !defined(MACOS) && !defined(GC_ANDROID_LOG) \
    && !defined(NN_PLATFORM_CTR) && !defined(NINTENDO_SWITCH) \
    && (!defined(MSWIN32) || defined(CONSOLE_LOG)) && !defined(MSWINCE)
  STATIC int GC_stdout = GC_DEFAULT_STDOUT_FD;
  STATIC int GC_stderr = GC_DEFAULT_STDERR_FD;
  STATIC int GC_log = GC_DEFAULT_STDERR_FD;

# ifndef MSWIN32
    GC_API void GC_CALL GC_set_log_fd(int fd)
    {
      GC_log = fd;
    }
# endif
#endif

#ifdef MSGBOX_ON_ERROR
  STATIC void GC_win32_MessageBoxA(const char *msg, const char *caption,
                                   unsigned flags)
  {
#   ifndef DONT_USE_USER32_DLL
      /* Use static binding to "user32.dll".    */
      (void)MessageBoxA(NULL, msg, caption, flags);
#   else
      /* This simplifies linking - resolve "MessageBoxA" at run-time. */
      HINSTANCE hU32 = LoadLibrary(TEXT("user32.dll"));
      if (hU32) {
        FARPROC pfn = GetProcAddress(hU32, "MessageBoxA");
        if (pfn)
          (void)(*(int (WINAPI *)(HWND, LPCSTR, LPCSTR, UINT))(word)pfn)(
                              NULL /* hWnd */, msg, caption, flags);
        (void)FreeLibrary(hU32);
      }
#   endif
  }
#endif /* MSGBOX_ON_ERROR */

#if defined(THREADS) && defined(UNIX_LIKE) && !defined(NO_GETCONTEXT)
  static void callee_saves_pushed_dummy_fn(ptr_t data GC_ATTR_UNUSED,
                                           void * context GC_ATTR_UNUSED) {}
#endif

#ifndef SMALL_CONFIG
# ifdef MANUAL_VDB
    static GC_bool manual_vdb_allowed = TRUE;
# else
    static GC_bool manual_vdb_allowed = FALSE;
# endif

  GC_API void GC_CALL GC_set_manual_vdb_allowed(int value)
  {
    manual_vdb_allowed = (GC_bool)value;
  }

  GC_API int GC_CALL GC_get_manual_vdb_allowed(void)
  {
    return (int)manual_vdb_allowed;
  }
#endif /* !SMALL_CONFIG */

STATIC word GC_parse_mem_size_arg(const char *str)
{
  word result = 0; /* bad value */

  if (*str != '\0') {
    char *endptr;
    char ch;

    result = (word)STRTOULL(str, &endptr, 10);
    ch = *endptr;
    if (ch != '\0') {
      if (*(endptr + 1) != '\0')
        return 0;
      /* Allow k, M or G suffix. */
      switch (ch) {
      case 'K':
      case 'k':
        result <<= 10;
        break;
      case 'M':
      case 'm':
        result <<= 20;
        break;
      case 'G':
      case 'g':
        result <<= 30;
        break;
      default:
        result = 0;
      }
    }
  }
  return result;
}

#define GC_LOG_STD_NAME "gc.log"

GC_API void GC_CALL GC_init(void)
{
    /* LOCK(); -- no longer does anything this early. */
    word initial_heap_sz;
    IF_CANCEL(int cancel_state;)
#   if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED)
      DCL_LOCK_STATE;
#   endif

    if (EXPECT(GC_is_initialized, TRUE)) return;
#   ifdef REDIRECT_MALLOC
      {
        static GC_bool init_started = FALSE;
        if (init_started)
          ABORT("Redirected malloc() called during GC init");
        init_started = TRUE;
      }
#   endif

#   if defined(GC_INITIAL_HEAP_SIZE) && !defined(CPPCHECK)
      initial_heap_sz = GC_INITIAL_HEAP_SIZE;
#   else
      initial_heap_sz = MINHINCR * HBLKSIZE;
#   endif

    DISABLE_CANCEL(cancel_state);
    /* Note that although we are nominally called with the */
    /* allocation lock held, the allocation lock is now    */
    /* only really acquired once a second thread is forked.*/
    /* And the initialization code needs to run before     */
    /* then.  Thus we really don't hold any locks, and can */
    /* in fact safely initialize them here.                */
#   ifdef THREADS
#     ifndef GC_ALWAYS_MULTITHREADED
        GC_ASSERT(!GC_need_to_lock);
#     endif
#     ifdef SN_TARGET_PS3
        {
          pthread_mutexattr_t mattr;

          if (0 != pthread_mutexattr_init(&mattr)) {
            ABORT("pthread_mutexattr_init failed");
          }
          if (0 != pthread_mutex_init(&GC_allocate_ml, &mattr)) {
            ABORT("pthread_mutex_init failed");
          }
          (void)pthread_mutexattr_destroy(&mattr);
        }
#     endif
#   endif /* THREADS */
#   if defined(GC_WIN32_THREADS) && !defined(GC_PTHREADS)
#     ifndef SPIN_COUNT
#       define SPIN_COUNT 4000
#     endif
#     ifdef MSWINRT_FLAVOR
        InitializeCriticalSectionAndSpinCount(&GC_allocate_ml, SPIN_COUNT);
#     else
        {
#         ifndef MSWINCE
            FARPROC pfn = 0;
            HMODULE hK32 = GetModuleHandle(TEXT("kernel32.dll"));
            if (hK32)
              pfn = GetProcAddress(hK32,
                                   "InitializeCriticalSectionAndSpinCount");
            if (pfn) {
              (*(BOOL (WINAPI *)(LPCRITICAL_SECTION, DWORD))(word)pfn)(
                                &GC_allocate_ml, SPIN_COUNT);
            } else
#         endif /* !MSWINCE */
          /* else */ InitializeCriticalSection(&GC_allocate_ml);
        }
#     endif
#   endif /* GC_WIN32_THREADS && !GC_PTHREADS */
#   if defined(GC_WIN32_THREADS) \
       && ((defined(MSWIN32) && !defined(CONSOLE_LOG)) || defined(MSWINCE))
      InitializeCriticalSection(&GC_write_cs);
#   endif
    GC_setpagesize();
#   ifdef MSWIN32
      GC_init_win32();
#   endif
#   ifdef GC_READ_ENV_FILE
      GC_envfile_init();
#   endif
#   if !defined(NO_CLOCK) || !defined(SMALL_CONFIG)
#     ifdef GC_PRINT_VERBOSE_STATS
        /* This is useful for debugging and profiling on platforms with */
        /* missing getenv() (like WinCE).                               */
        GC_print_stats = VERBOSE;
#     else
        if (0 != GETENV("GC_PRINT_VERBOSE_STATS")) {
          GC_print_stats = VERBOSE;
        } else if (0 != GETENV("GC_PRINT_STATS")) {
          GC_print_stats = 1;
        }
#     endif
#   endif
#   if ((defined(UNIX_LIKE) && !defined(GC_ANDROID_LOG)) \
        || (defined(CONSOLE_LOG) && defined(MSWIN32)) \
        || defined(CYGWIN32) || defined(SYMBIAN)) && !defined(SMALL_CONFIG)
        {
          char * file_name = TRUSTED_STRING(GETENV("GC_LOG_FILE"));
#         ifdef GC_LOG_TO_FILE_ALWAYS
            if (NULL == file_name)
              file_name = GC_LOG_STD_NAME;
#         else
            if (0 != file_name)
#         endif
          {
#           if defined(_MSC_VER)
              int log_d = _open(file_name, O_CREAT | O_WRONLY | O_APPEND);
#           else
              int log_d = open(file_name, O_CREAT | O_WRONLY | O_APPEND, 0644);
#           endif
            if (log_d < 0) {
              GC_err_printf("Failed to open %s as log file\n", file_name);
            } else {
              char *str;
              GC_log = log_d;
              str = GETENV("GC_ONLY_LOG_TO_FILE");
#             ifdef GC_ONLY_LOG_TO_FILE
                /* The similar environment variable set to "0"  */
                /* overrides the effect of the macro defined.   */
                if (str != NULL && *str == '0' && *(str + 1) == '\0')
#             else
                /* Otherwise setting the environment variable   */
                /* to anything other than "0" will prevent from */
                /* redirecting stdout/err to the log file.      */
                if (str == NULL || (*str == '0' && *(str + 1) == '\0'))
#             endif
              {
                GC_stdout = log_d;
                GC_stderr = log_d;
              }
            }
          }
        }
#   endif
#   if !defined(NO_DEBUGGING) && !defined(GC_DUMP_REGULARLY)
      if (0 != GETENV("GC_DUMP_REGULARLY")) {
        GC_dump_regularly = TRUE;
      }
#   endif
#   ifdef KEEP_BACK_PTRS
      {
        char * backtraces_string = GETENV("GC_BACKTRACES");
        if (0 != backtraces_string) {
          GC_backtraces = atol(backtraces_string);
          if (backtraces_string[0] == '\0') GC_backtraces = 1;
        }
      }
#   endif
    if (0 != GETENV("GC_FIND_LEAK")) {
      GC_find_leak = 1;
    }
#   ifndef SHORT_DBG_HDRS
      if (0 != GETENV("GC_FINDLEAK_DELAY_FREE")) {
        GC_findleak_delay_free = TRUE;
      }
#   endif
    if (0 != GETENV("GC_ALL_INTERIOR_POINTERS")) {
      GC_all_interior_pointers = 1;
    }
    if (0 != GETENV("GC_DONT_GC")) {
#     ifdef LINT2
        GC_disable();
#     else
        GC_dont_gc = 1;
#     endif
    }
    if (0 != GETENV("GC_PRINT_BACK_HEIGHT")) {
      GC_print_back_height = TRUE;
    }
    if (0 != GETENV("GC_NO_BLACKLIST_WARNING")) {
      GC_large_alloc_warn_interval = LONG_MAX;
    }
    {
      char * addr_string = GETENV("GC_TRACE");
      if (0 != addr_string) {
#       ifndef ENABLE_TRACE
          WARN("Tracing not enabled: Ignoring GC_TRACE value\n", 0);
#       else
          word addr = (word)STRTOULL(addr_string, NULL, 16);
          if (addr < 0x1000)
              WARN("Unlikely trace address: %p\n", (void *)addr);
          GC_trace_addr = (ptr_t)addr;
#       endif
      }
    }
#   ifdef GC_COLLECT_AT_MALLOC
      {
        char * string = GETENV("GC_COLLECT_AT_MALLOC");
        if (0 != string) {
          size_t min_lb = (size_t)STRTOULL(string, NULL, 10);
          if (min_lb > 0)
            GC_dbg_collect_at_malloc_min_lb = min_lb;
        }
      }
#   endif
#   if !defined(GC_DISABLE_INCREMENTAL) && !defined(NO_CLOCK)
      {
        char * time_limit_string = GETENV("GC_PAUSE_TIME_TARGET");
        if (0 != time_limit_string) {
          long time_limit = atol(time_limit_string);
          if (time_limit > 0) {
            GC_time_limit = time_limit;
          }
        }
      }
#   endif
#   ifndef SMALL_CONFIG
      {
        char * full_freq_string = GETENV("GC_FULL_FREQUENCY");
        if (full_freq_string != NULL) {
          int full_freq = atoi(full_freq_string);
          if (full_freq > 0)
            GC_full_freq = full_freq;
        }
      }
#   endif
    {
      char * interval_string = GETENV("GC_LARGE_ALLOC_WARN_INTERVAL");
      if (0 != interval_string) {
        long interval = atol(interval_string);
        if (interval <= 0) {
          WARN("GC_LARGE_ALLOC_WARN_INTERVAL environment variable has "
               "bad value: Ignoring\n", 0);
        } else {
          GC_large_alloc_warn_interval = interval;
        }
      }
    }
    {
        char * space_divisor_string = GETENV("GC_FREE_SPACE_DIVISOR");
        if (space_divisor_string != NULL) {
          int space_divisor = atoi(space_divisor_string);
          if (space_divisor > 0)
            GC_free_space_divisor = (unsigned)space_divisor;
        }
    }
#   ifdef USE_MUNMAP
      {
        char * string = GETENV("GC_UNMAP_THRESHOLD");
        if (string != NULL) {
          if (*string == '0' && *(string + 1) == '\0') {
            /* "0" is used to disable unmapping. */
            GC_unmap_threshold = 0;
          } else {
            int unmap_threshold = atoi(string);
            if (unmap_threshold > 0)
              GC_unmap_threshold = unmap_threshold;
          }
        }
      }
      {
        char * string = GETENV("GC_FORCE_UNMAP_ON_GCOLLECT");
        if (string != NULL) {
          if (*string == '0' && *(string + 1) == '\0') {
            /* "0" is used to turn off the mode. */
            GC_force_unmap_on_gcollect = FALSE;
          } else {
            GC_force_unmap_on_gcollect = TRUE;
          }
        }
      }
      {
        char * string = GETENV("GC_USE_ENTIRE_HEAP");
        if (string != NULL) {
          if (*string == '0' && *(string + 1) == '\0') {
            /* "0" is used to turn off the mode. */
            GC_use_entire_heap = FALSE;
          } else {
            GC_use_entire_heap = TRUE;
          }
        }
      }
#   endif
#   if !defined(NO_DEBUGGING) && !defined(NO_CLOCK)
      GET_TIME(GC_init_time);
#   endif
    maybe_install_looping_handler();
#   if ALIGNMENT > GC_DS_TAGS
      /* Adjust normal object descriptor for extra allocation.  */
      if (EXTRA_BYTES != 0)
        GC_obj_kinds[NORMAL].ok_descriptor = (word)(-ALIGNMENT) | GC_DS_LENGTH;
#   endif
    GC_exclude_static_roots_inner(beginGC_arrays, endGC_arrays);
    GC_exclude_static_roots_inner(beginGC_obj_kinds, endGC_obj_kinds);
#   ifdef SEPARATE_GLOBALS
      GC_exclude_static_roots_inner(beginGC_objfreelist, endGC_objfreelist);
      GC_exclude_static_roots_inner(beginGC_aobjfreelist, endGC_aobjfreelist);
#   endif
#   if defined(USE_PROC_FOR_LIBRARIES) && defined(GC_LINUX_THREADS)
        WARN("USE_PROC_FOR_LIBRARIES + GC_LINUX_THREADS performs poorly.\n", 0);
        /* If thread stacks are cached, they tend to be scanned in      */
        /* entirety as part of the root set.  This will grow them to    */
        /* maximum size, and is generally not desirable.                */
#   endif
#   if !defined(THREADS) || defined(GC_PTHREADS) \
        || defined(NN_PLATFORM_CTR) || defined(NINTENDO_SWITCH) \
        || defined(GC_WIN32_THREADS) || defined(GC_SOLARIS_THREADS)
      if (GC_stackbottom == 0) {
        GC_stackbottom = GC_get_main_stack_base();
#       if (defined(LINUX) || defined(HPUX)) && defined(IA64)
          GC_register_stackbottom = GC_get_register_stack_base();
#       endif
      } else {
#       if (defined(LINUX) || defined(HPUX)) && defined(IA64)
          if (GC_register_stackbottom == 0) {
            WARN("GC_register_stackbottom should be set with GC_stackbottom\n", 0);
            /* The following may fail, since we may rely on             */
            /* alignment properties that may not hold with a user set   */
            /* GC_stackbottom.                                          */
            GC_register_stackbottom = GC_get_register_stack_base();
          }
#       endif
      }
#   endif
#   if !defined(CPPCHECK)
      GC_STATIC_ASSERT(sizeof(ptr_t) == sizeof(word));
      GC_STATIC_ASSERT(sizeof(signed_word) == sizeof(word));
#     if !defined(_AUX_SOURCE) || defined(__GNUC__)
        GC_STATIC_ASSERT((word)(-1) > (word)0);
        /* word should be unsigned */
#     endif
      /* We no longer check for ((void*)(-1) > NULL) since all pointers */
      /* are explicitly cast to word in every less/greater comparison.  */
      GC_STATIC_ASSERT((signed_word)(-1) < (signed_word)0);
#   endif
    GC_STATIC_ASSERT(sizeof (struct hblk) == HBLKSIZE);
#   ifndef THREADS
      GC_ASSERT(!((word)GC_stackbottom HOTTER_THAN (word)GC_approx_sp()));
#   endif
    GC_init_headers();
#   if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED) \
       && (defined(SEARCH_FOR_DATA_START) || defined(NETBSD))
      LOCK(); /* just to set GC_lock_holder */
#   endif
#   ifdef SEARCH_FOR_DATA_START
      /* For MPROTECT_VDB, the temporary fault handler should be        */
      /* installed first, before the write fault one in GC_dirty_init.  */
      if (GC_REGISTER_MAIN_STATIC_DATA()) GC_init_linux_data_start();
#   elif defined(NETBSD) && defined(__ELF__)
      if (GC_REGISTER_MAIN_STATIC_DATA()) GC_init_netbsd_elf();
#   endif
#   if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED) \
       && (defined(SEARCH_FOR_DATA_START) || defined(NETBSD))
      UNLOCK();
#   endif
#   ifndef GC_DISABLE_INCREMENTAL
      if (GC_incremental || 0 != GETENV("GC_ENABLE_INCREMENTAL")) {
#       if defined(BASE_ATOMIC_OPS_EMULATED) || defined(CHECKSUMS) \
           || defined(REDIRECT_MALLOC) || defined(REDIRECT_MALLOC_IN_HEADER) \
           || defined(SMALL_CONFIG)
          /* TODO: Implement CHECKSUMS for manual VDB. */
#       else
          if (manual_vdb_allowed) {
              GC_manual_vdb = TRUE;
              GC_incremental = TRUE;
          } else
#       endif
        /* else */ {
          /* For GWW_VDB on Win32, this needs to happen before any      */
          /* heap memory is allocated.                                  */
          GC_incremental = GC_dirty_init();
          GC_ASSERT(GC_bytes_allocd == 0);
        }
      }
#   endif

    /* Add initial guess of root sets.  Do this first, since sbrk(0)    */
    /* might be used.                                                   */
      if (GC_REGISTER_MAIN_STATIC_DATA()) GC_register_data_segments();

    GC_bl_init();
    GC_mark_init();
    {
        char * sz_str = GETENV("GC_INITIAL_HEAP_SIZE");
        if (sz_str != NULL) {
          initial_heap_sz = GC_parse_mem_size_arg(sz_str);
          if (initial_heap_sz <= MINHINCR * HBLKSIZE) {
            WARN("Bad initial heap size %s - ignoring it.\n", sz_str);
          }
        }
    }
    {
        char * sz_str = GETENV("GC_MAXIMUM_HEAP_SIZE");
        if (sz_str != NULL) {
          word max_heap_sz = GC_parse_mem_size_arg(sz_str);
          if (max_heap_sz < initial_heap_sz) {
            WARN("Bad maximum heap size %s - ignoring it.\n", sz_str);
          }
          if (0 == GC_max_retries) GC_max_retries = 2;
          GC_set_max_heap_size(max_heap_sz);
        }
    }
#   if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED)
        LOCK(); /* just to set GC_lock_holder */
#   endif
    if (!GC_expand_hp_inner(divHBLKSZ(initial_heap_sz))) {
        GC_err_printf("Can't start up: not enough memory\n");
        EXIT();
    } else {
        GC_requested_heapsize += initial_heap_sz;
    }
    if (GC_all_interior_pointers)
      GC_initialize_offsets();
    GC_register_displacement_inner(0L);
#   if defined(GC_LINUX_THREADS) && defined(REDIRECT_MALLOC)
      if (!GC_all_interior_pointers) {
        /* TLS ABI uses pointer-sized offsets for dtv. */
        GC_register_displacement_inner(sizeof(void *));
      }
#   endif
    GC_init_size_map();
#   ifdef PCR
      if (PCR_IL_Lock(PCR_Bool_false, PCR_allSigsBlocked, PCR_waitForever)
          != PCR_ERes_okay) {
          ABORT("Can't lock load state");
      } else if (PCR_IL_Unlock() != PCR_ERes_okay) {
          ABORT("Can't unlock load state");
      }
      PCR_IL_Unlock();
      GC_pcr_install();
#   endif
    GC_is_initialized = TRUE;
#   if defined(GC_PTHREADS) || defined(GC_WIN32_THREADS)
#       if defined(LINT2) \
           && !(defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED))
          LOCK();
          GC_thr_init();
          UNLOCK();
#       else
          GC_thr_init();
#       endif
#   endif
    COND_DUMP;
    /* Get black list set up and/or incremental GC started */
    if (!GC_dont_precollect || GC_incremental) {
        GC_gcollect_inner();
    }
#   if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED)
        UNLOCK();
#   endif
#   if defined(THREADS) && defined(UNIX_LIKE) && !defined(NO_GETCONTEXT)
      /* Ensure getcontext_works is set to avoid potential data race.   */
      if (GC_dont_gc || GC_dont_precollect)
        GC_with_callee_saves_pushed(callee_saves_pushed_dummy_fn, NULL);
#   endif
#   ifndef DONT_USE_ATEXIT
      if (GC_find_leak) {
        /* This is to give us at least one chance to detect leaks.        */
        /* This may report some very benign leaks, but ...                */
        atexit(GC_exit_check);
      }
#   endif

    /* The rest of this again assumes we don't really hold      */
    /* the allocation lock.                                     */
#   if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC) \
       || (defined(GC_ALWAYS_MULTITHREADED) && defined(GC_WIN32_THREADS) \
           && !defined(GC_NO_THREADS_DISCOVERY))
        /* Make sure thread local allocation is initialized, in */
        /* case we did not get called from GC_init_parallel().  */
        GC_init_parallel();
#   endif /* PARALLEL_MARK || THREAD_LOCAL_ALLOC */

#   if defined(DYNAMIC_LOADING) && defined(DARWIN)
        /* This must be called WITHOUT the allocation lock held */
        /* and before any threads are created.                  */
        GC_init_dyld();
#   endif
    RESTORE_CANCEL(cancel_state);
}

GC_API void GC_CALL GC_enable_incremental(void)
{
# if !defined(GC_DISABLE_INCREMENTAL) && !defined(KEEP_BACK_PTRS)
    DCL_LOCK_STATE;
    /* If we are keeping back pointers, the GC itself dirties all */
    /* pages on which objects have been marked, making            */
    /* incremental GC pointless.                                  */
    if (!GC_find_leak && 0 == GETENV("GC_DISABLE_INCREMENTAL")) {
      LOCK();
      if (!GC_incremental) {
        GC_setpagesize();
        /* if (GC_no_win32_dlls) goto out; Should be win32S test? */
        maybe_install_looping_handler(); /* Before write fault handler! */
        if (!GC_is_initialized) {
          UNLOCK();
          GC_incremental = TRUE; /* indicate intention to turn it on */
          GC_init();
          LOCK();
        } else {
#         if !defined(BASE_ATOMIC_OPS_EMULATED) && !defined(CHECKSUMS) \
             && !defined(REDIRECT_MALLOC) \
             && !defined(REDIRECT_MALLOC_IN_HEADER) && !defined(SMALL_CONFIG)
            if (manual_vdb_allowed) {
              GC_manual_vdb = TRUE;
              GC_incremental = TRUE;
            } else
#         endif
          /* else */ {
            GC_incremental = GC_dirty_init();
          }
        }
        if (GC_incremental && !GC_dont_gc) {
                                /* Can't easily do it if GC_dont_gc.    */
          IF_CANCEL(int cancel_state;)

          DISABLE_CANCEL(cancel_state);
          if (GC_bytes_allocd > 0) {
            /* There may be unmarked reachable objects. */
            GC_gcollect_inner();
          }
            /* else we're OK in assuming everything's   */
            /* clean since nothing can point to an      */
            /* unmarked object.                         */
          GC_read_dirty(FALSE);
          RESTORE_CANCEL(cancel_state);
        }
      }
      UNLOCK();
      return;
    }
# endif
  GC_init();
}

GC_API void GC_CALL GC_start_mark_threads(void)
{
#   ifdef PARALLEL_MARK
      IF_CANCEL(int cancel_state;)
      DCL_LOCK_STATE;

      DISABLE_CANCEL(cancel_state);
      LOCK();
      GC_start_mark_threads_inner();
      UNLOCK();
      RESTORE_CANCEL(cancel_state);
#   else
      /* No action since parallel markers are disabled (or no POSIX fork). */
      GC_ASSERT(I_DONT_HOLD_LOCK());
#   endif
}

  GC_API void GC_CALL GC_deinit(void)
  {
    if (GC_is_initialized) {
      /* Prevent duplicate resource close.  */
      GC_is_initialized = FALSE;
#     if defined(GC_WIN32_THREADS) && (defined(MSWIN32) || defined(MSWINCE))
#       if !defined(CONSOLE_LOG) || defined(MSWINCE)
          DeleteCriticalSection(&GC_write_cs);
#       endif
#       ifndef GC_PTHREADS
          DeleteCriticalSection(&GC_allocate_ml);
#       endif
#     endif
    }
  }

#if (defined(MSWIN32) && !defined(CONSOLE_LOG)) || defined(MSWINCE)

# if defined(_MSC_VER) && defined(_DEBUG) && !defined(MSWINCE)
#   include <crtdbg.h>
# endif

  STATIC HANDLE GC_log = 0;

# ifdef THREADS
#   if defined(PARALLEL_MARK) && !defined(GC_ALWAYS_MULTITHREADED)
#     define IF_NEED_TO_LOCK(x) if (GC_parallel || GC_need_to_lock) x
#   else
#     define IF_NEED_TO_LOCK(x) if (GC_need_to_lock) x
#   endif
# else
#   define IF_NEED_TO_LOCK(x)
# endif /* !THREADS */

# ifdef MSWINRT_FLAVOR
#   include <windows.storage.h>

    /* This API is defined in roapi.h, but we cannot include it here    */
    /* since it does not compile in C.                                  */
    DECLSPEC_IMPORT HRESULT WINAPI RoGetActivationFactory(
                                        HSTRING activatableClassId,
                                        REFIID iid, void** factory);

    static GC_bool getWinRTLogPath(wchar_t* buf, size_t bufLen)
    {
      static const GUID kIID_IApplicationDataStatics = {
        0x5612147B, 0xE843, 0x45E3,
        0x94, 0xD8, 0x06, 0x16, 0x9E, 0x3C, 0x8E, 0x17
      };
      static const GUID kIID_IStorageItem = {
        0x4207A996, 0xCA2F, 0x42F7,
        0xBD, 0xE8, 0x8B, 0x10, 0x45, 0x7A, 0x7F, 0x30
      };
      GC_bool result = FALSE;
      HSTRING_HEADER appDataClassNameHeader;
      HSTRING appDataClassName;
      __x_ABI_CWindows_CStorage_CIApplicationDataStatics* appDataStatics = 0;

      GC_ASSERT(bufLen > 0);
      if (SUCCEEDED(WindowsCreateStringReference(
                      RuntimeClass_Windows_Storage_ApplicationData,
                      (sizeof(RuntimeClass_Windows_Storage_ApplicationData)-1)
                        / sizeof(wchar_t),
                      &appDataClassNameHeader, &appDataClassName))
          && SUCCEEDED(RoGetActivationFactory(appDataClassName,
                                              &kIID_IApplicationDataStatics,
                                              &appDataStatics))) {
        __x_ABI_CWindows_CStorage_CIApplicationData* appData = NULL;
        __x_ABI_CWindows_CStorage_CIStorageFolder* tempFolder = NULL;
        __x_ABI_CWindows_CStorage_CIStorageItem* tempFolderItem = NULL;
        HSTRING tempPath = NULL;

        if (SUCCEEDED(appDataStatics->lpVtbl->get_Current(appDataStatics,
                                                          &appData))
            && SUCCEEDED(appData->lpVtbl->get_TemporaryFolder(appData,
                                                              &tempFolder))
            && SUCCEEDED(tempFolder->lpVtbl->QueryInterface(tempFolder,
                                                        &kIID_IStorageItem,
                                                        &tempFolderItem))
            && SUCCEEDED(tempFolderItem->lpVtbl->get_Path(tempFolderItem,
                                                          &tempPath))) {
          UINT32 tempPathLen;
          const wchar_t* tempPathBuf =
                          WindowsGetStringRawBuffer(tempPath, &tempPathLen);

          buf[0] = '\0';
          if (wcsncat_s(buf, bufLen, tempPathBuf, tempPathLen) == 0
              && wcscat_s(buf, bufLen, L"\\") == 0
              && wcscat_s(buf, bufLen, TEXT(GC_LOG_STD_NAME)) == 0)
            result = TRUE;
          WindowsDeleteString(tempPath);
        }

        if (tempFolderItem != NULL)
          tempFolderItem->lpVtbl->Release(tempFolderItem);
        if (tempFolder != NULL)
          tempFolder->lpVtbl->Release(tempFolder);
        if (appData != NULL)
          appData->lpVtbl->Release(appData);
        appDataStatics->lpVtbl->Release(appDataStatics);
      }
      return result;
    }
# endif /* MSWINRT_FLAVOR */

  STATIC HANDLE GC_CreateLogFile(void)
  {
    HANDLE hFile;
# ifdef MSWINRT_FLAVOR
      TCHAR pathBuf[_MAX_PATH + 0x10]; /* buffer for path + ext */

      hFile = INVALID_HANDLE_VALUE;
      if (getWinRTLogPath(pathBuf, _MAX_PATH + 1)) {
        CREATEFILE2_EXTENDED_PARAMETERS extParams;

        BZERO(&extParams, sizeof(extParams));
        extParams.dwSize = sizeof(extParams);
        extParams.dwFileAttributes = FILE_ATTRIBUTE_NORMAL;
        extParams.dwFileFlags = GC_print_stats == VERBOSE ? 0
                                    : FILE_FLAG_WRITE_THROUGH;
        hFile = CreateFile2(pathBuf, GENERIC_WRITE, FILE_SHARE_READ,
                            CREATE_ALWAYS, &extParams);
      }

# else
    TCHAR *logPath;
#   if defined(NO_GETENV_WIN32) && defined(CPPCHECK)
#     define appendToFile FALSE
#   else
      BOOL appendToFile = FALSE;
#   endif
#   if !defined(NO_GETENV_WIN32) || !defined(OLD_WIN32_LOG_FILE)
      TCHAR pathBuf[_MAX_PATH + 0x10]; /* buffer for path + ext */

      logPath = pathBuf;
#   endif

    /* Use GetEnvironmentVariable instead of GETENV() for unicode support. */
#   ifndef NO_GETENV_WIN32
      if (GetEnvironmentVariable(TEXT("GC_LOG_FILE"), pathBuf,
                                 _MAX_PATH + 1) - 1U < (DWORD)_MAX_PATH) {
        appendToFile = TRUE;
      } else
#   endif
    /* else */ {
      /* Env var not found or its value too long.       */
#     ifdef OLD_WIN32_LOG_FILE
        logPath = TEXT(GC_LOG_STD_NAME);
#     else
        int len = (int)GetModuleFileName(NULL /* hModule */, pathBuf,
                                         _MAX_PATH + 1);
        /* If GetModuleFileName() has failed then len is 0. */
        if (len > 4 && pathBuf[len - 4] == (TCHAR)'.') {
          len -= 4; /* strip executable file extension */
        }
        BCOPY(TEXT(".") TEXT(GC_LOG_STD_NAME), &pathBuf[len],
              sizeof(TEXT(".") TEXT(GC_LOG_STD_NAME)));
#     endif
    }

    hFile = CreateFile(logPath, GENERIC_WRITE, FILE_SHARE_READ,
                       NULL /* lpSecurityAttributes */,
                       appendToFile ? OPEN_ALWAYS : CREATE_ALWAYS,
                       GC_print_stats == VERBOSE ? FILE_ATTRIBUTE_NORMAL :
                            /* immediately flush writes unless very verbose */
                            FILE_ATTRIBUTE_NORMAL | FILE_FLAG_WRITE_THROUGH,
                       NULL /* hTemplateFile */);

#   ifndef NO_GETENV_WIN32
      if (appendToFile && hFile != INVALID_HANDLE_VALUE) {
        LONG posHigh = 0;
        (void)SetFilePointer(hFile, 0, &posHigh, FILE_END);
                                  /* Seek to file end (ignoring any error) */
      }
#   endif
#   undef appendToFile
# endif
    return hFile;
  }

  STATIC int GC_write(const char *buf, size_t len)
  {
      BOOL res;
      DWORD written;
#     if defined(THREADS) && defined(GC_ASSERTIONS)
        static GC_bool inside_write = FALSE;
                        /* to prevent infinite recursion at abort.      */
        if (inside_write)
          return -1;
#     endif

      if (len == 0)
          return 0;
      IF_NEED_TO_LOCK(EnterCriticalSection(&GC_write_cs));
#     if defined(THREADS) && defined(GC_ASSERTIONS)
        if (GC_write_disabled) {
          inside_write = TRUE;
          ABORT("Assertion failure: GC_write called with write_disabled");
        }
#     endif
      if (GC_log == 0) {
        GC_log = GC_CreateLogFile();
      }
      if (GC_log == INVALID_HANDLE_VALUE) {
        IF_NEED_TO_LOCK(LeaveCriticalSection(&GC_write_cs));
#       ifdef NO_DEBUGGING
          /* Ignore open log failure (e.g., it might be caused by       */
          /* read-only folder of the client application).               */
          return 0;
#       else
          return -1;
#       endif
      }
      res = WriteFile(GC_log, buf, (DWORD)len, &written, NULL);
#     if defined(_MSC_VER) && defined(_DEBUG) && !defined(NO_CRT)
#         ifdef MSWINCE
              /* There is no CrtDbgReport() in WinCE */
              {
                  WCHAR wbuf[1024];
                  /* Always use Unicode variant of OutputDebugString() */
                  wbuf[MultiByteToWideChar(CP_ACP, 0 /* dwFlags */,
                                buf, len, wbuf,
                                sizeof(wbuf) / sizeof(wbuf[0]) - 1)] = 0;
                  OutputDebugStringW(wbuf);
              }
#         else
              _CrtDbgReport(_CRT_WARN, NULL, 0, NULL, "%.*s", len, buf);
#         endif
#     endif
      IF_NEED_TO_LOCK(LeaveCriticalSection(&GC_write_cs));
      return res ? (int)written : -1;
  }

  /* TODO: This is pretty ugly ... */
# define WRITE(f, buf, len) GC_write(buf, len)

#elif defined(OS2) || defined(MACOS)
  STATIC FILE * GC_stdout = NULL;
  STATIC FILE * GC_stderr = NULL;
  STATIC FILE * GC_log = NULL;

  /* Initialize GC_log (and the friends) passed to GC_write().  */
  STATIC void GC_set_files(void)
  {
    if (GC_stdout == NULL) {
      GC_stdout = stdout;
    }
    if (GC_stderr == NULL) {
      GC_stderr = stderr;
    }
    if (GC_log == NULL) {
      GC_log = stderr;
    }
  }

  GC_INLINE int GC_write(FILE *f, const char *buf, size_t len)
  {
    int res = fwrite(buf, 1, len, f);
    fflush(f);
    return res;
  }

# define WRITE(f, buf, len) (GC_set_files(), GC_write(f, buf, len))

#elif defined(GC_ANDROID_LOG)

# include <android/log.h>

# ifndef GC_ANDROID_LOG_TAG
#   define GC_ANDROID_LOG_TAG "BDWGC"
# endif

# define GC_stdout ANDROID_LOG_DEBUG
# define GC_stderr ANDROID_LOG_ERROR
# define GC_log GC_stdout

# define WRITE(level, buf, unused_len) \
                __android_log_write(level, GC_ANDROID_LOG_TAG, buf)

#elif defined(NN_PLATFORM_CTR)
  int n3ds_log_write(const char* text, int length);
# define WRITE(level, buf, len) n3ds_log_write(buf, len)

#elif defined(NINTENDO_SWITCH)
  int switch_log_write(const char* text, int length);
# define WRITE(level, buf, len) switch_log_write(buf, len)

#else

# if !defined(GC_NO_TYPES) && !defined(SN_TARGET_PSP2)
#   if !defined(AMIGA) && !defined(MSWIN32) && !defined(MSWIN_XBOX1) \
       && !defined(__CC_ARM)
#     include <unistd.h>
#   endif
#   if !defined(ECOS) && !defined(NOSYS)
#     include <errno.h>
#   endif
# endif /* !GC_NO_TYPES && !SN_TARGET_PSP2 */

  STATIC int GC_write(int fd, const char *buf, size_t len)
  {
#   if defined(ECOS) || defined(PLATFORM_WRITE) || defined(SN_TARGET_PSP2) \
       || defined(NOSYS)
#     ifdef ECOS
        /* FIXME: This seems to be defined nowhere at present.  */
        /* _Jv_diag_write(buf, len); */
#     else
        /* No writing.  */
#     endif
      return len;
#   else
      int bytes_written = 0;
      IF_CANCEL(int cancel_state;)

      DISABLE_CANCEL(cancel_state);
      while ((unsigned)bytes_written < len) {
#        ifdef GC_SOLARIS_THREADS
             int result = syscall(SYS_write, fd, buf + bytes_written,
                                             len - bytes_written);
#        elif defined(_MSC_VER)
             int result = _write(fd, buf + bytes_written,
                                 (unsigned)(len - bytes_written));
#        else
             int result = write(fd, buf + bytes_written, len - bytes_written);
#        endif

         if (-1 == result) {
             if (EAGAIN == errno) /* Resource temporarily unavailable */
               continue;
             RESTORE_CANCEL(cancel_state);
             return(result);
         }
         bytes_written += result;
      }
      RESTORE_CANCEL(cancel_state);
      return(bytes_written);
#   endif
  }

# define WRITE(f, buf, len) GC_write(f, buf, len)
#endif /* !MSWINCE && !OS2 && !MACOS && !GC_ANDROID_LOG */

#define BUFSZ 1024

#if defined(DJGPP) || defined(__STRICT_ANSI__)
  /* vsnprintf is missing in DJGPP (v2.0.3) */
# define GC_VSNPRINTF(buf, bufsz, format, args) vsprintf(buf, format, args)
#elif defined(_MSC_VER)
# ifdef MSWINCE
    /* _vsnprintf is deprecated in WinCE */
#   define GC_VSNPRINTF StringCchVPrintfA
# else
#   define GC_VSNPRINTF _vsnprintf
# endif
#else
# define GC_VSNPRINTF vsnprintf
#endif

/* A version of printf that is unlikely to call malloc, and is thus safer */
/* to call from the collector in case malloc has been bound to GC_malloc. */
/* Floating point arguments and formats should be avoided, since FP       */
/* conversion is more likely to allocate memory.                          */
/* Assumes that no more than BUFSZ-1 characters are written at once.      */
#define GC_PRINTF_FILLBUF(buf, format) \
        do { \
          va_list args; \
          va_start(args, format); \
          (buf)[sizeof(buf) - 1] = 0x15; /* guard */ \
          (void)GC_VSNPRINTF(buf, sizeof(buf) - 1, format, args); \
          va_end(args); \
          if ((buf)[sizeof(buf) - 1] != 0x15) \
            ABORT("GC_printf clobbered stack"); \
        } while (0)

void GC_printf(const char *format, ...)
{
    if (!GC_quiet) {
      char buf[BUFSZ + 1];

      GC_PRINTF_FILLBUF(buf, format);
#     ifdef NACL
        (void)WRITE(GC_stdout, buf, strlen(buf));
        /* Ignore errors silently.      */
#     else
        if (WRITE(GC_stdout, buf, strlen(buf)) < 0
#           if defined(CYGWIN32) || (defined(CONSOLE_LOG) && defined(MSWIN32))
              && GC_stdout != GC_DEFAULT_STDOUT_FD
#           endif
           ) {
          ABORT("write to stdout failed");
        }
#     endif
    }
}

void GC_err_printf(const char *format, ...)
{
    char buf[BUFSZ + 1];

    GC_PRINTF_FILLBUF(buf, format);
    GC_err_puts(buf);
}

void GC_log_printf(const char *format, ...)
{
    char buf[BUFSZ + 1];

    GC_PRINTF_FILLBUF(buf, format);
#   ifdef NACL
      (void)WRITE(GC_log, buf, strlen(buf));
#   else
      if (WRITE(GC_log, buf, strlen(buf)) < 0
#         if defined(CYGWIN32) || (defined(CONSOLE_LOG) && defined(MSWIN32))
            && GC_log != GC_DEFAULT_STDERR_FD
#         endif
         ) {
        ABORT("write to GC log failed");
      }
#   endif
}

#ifndef GC_ANDROID_LOG

# define GC_warn_printf GC_err_printf

#else

  GC_INNER void GC_info_log_printf(const char *format, ...)
  {
    char buf[BUFSZ + 1];

    GC_PRINTF_FILLBUF(buf, format);
    (void)WRITE(ANDROID_LOG_INFO, buf, 0 /* unused */);
  }

  GC_INNER void GC_verbose_log_printf(const char *format, ...)
  {
    char buf[BUFSZ + 1];

    GC_PRINTF_FILLBUF(buf, format);
    (void)WRITE(ANDROID_LOG_VERBOSE, buf, 0); /* ignore write errors */
  }

  STATIC void GC_warn_printf(const char *format, ...)
  {
    char buf[BUFSZ + 1];

    GC_PRINTF_FILLBUF(buf, format);
    (void)WRITE(ANDROID_LOG_WARN, buf, 0);
  }

#endif /* GC_ANDROID_LOG */

void GC_err_puts(const char *s)
{
    (void)WRITE(GC_stderr, s, strlen(s)); /* ignore errors */
}

STATIC void GC_CALLBACK GC_default_warn_proc(char *msg, GC_word arg)
{
    /* TODO: Add assertion on arg comply with msg (format).     */
    GC_warn_printf(msg, arg);
}

GC_INNER GC_warn_proc GC_current_warn_proc = GC_default_warn_proc;

/* This is recommended for production code (release). */
GC_API void GC_CALLBACK GC_ignore_warn_proc(char *msg, GC_word arg)
{
    if (GC_print_stats) {
      /* Don't ignore warnings if stats printing is on. */
      GC_default_warn_proc(msg, arg);
    }
}

GC_API void GC_CALL GC_set_warn_proc(GC_warn_proc p)
{
    DCL_LOCK_STATE;
    GC_ASSERT(NONNULL_ARG_NOT_NULL(p));
#   ifdef GC_WIN32_THREADS
#     ifdef CYGWIN32
        /* Need explicit GC_INIT call */
        GC_ASSERT(GC_is_initialized);
#     else
        if (!GC_is_initialized) GC_init();
#     endif
#   endif
    LOCK();
    GC_current_warn_proc = p;
    UNLOCK();
}

GC_API GC_warn_proc GC_CALL GC_get_warn_proc(void)
{
    GC_warn_proc result;
    DCL_LOCK_STATE;
    LOCK();
    result = GC_current_warn_proc;
    UNLOCK();
    return(result);
}

#if !defined(PCR) && !defined(SMALL_CONFIG)
  /* Print (or display) a message before abnormal exit (including       */
  /* abort).  Invoked from ABORT(msg) macro (there msg is non-NULL)     */
  /* and from EXIT() macro (msg is NULL in that case).                  */
  STATIC void GC_CALLBACK GC_default_on_abort(const char *msg)
  {
#   ifndef DONT_USE_ATEXIT
      skip_gc_atexit = TRUE; /* disable at-exit GC_gcollect() */
#   endif

    if (msg != NULL) {
#     ifdef MSGBOX_ON_ERROR
--> --------------------

--> maximum size reached

--> --------------------

quality96%

¤ Dauer der Verarbeitung: 0.41 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.