1484

Committed 12 Apr 2023 08:54AM UTC coverage: 76.502% (+0.07%) from 76.429%

Build # 1484

Build Type

push

travis-ci-com

Committed by

ivmai

Commit Message

Do not add extra byte to large ignore-off-page objects

For ignore-off-page objects the client should guarantee the pointer
within the first heap block of the object, thus no need to add an extra
byte for such objects if the object size of at least one heap block.

* allchblk.c (setup_header): Add assertion that byte_sz is not less
than ALIGNMENT.
* allchblk.c [ALIGNMENT>GC_DS_TAGS] (setup_header): Modify descr local
variable to make it zero if IGNORE_OFF_PAGE flag is set and kind is
NORMAL (and object size is not less than HBLKSIZE); add comment.
* mallocx.c [ALIGNMENT>GC_DS_TAGS] (GC_realloc): Likewise.
* include/gc/gc.h (GC_all_interior_pointers): Update comment.
* include/private/gc_priv.h [MAX_EXTRA_BYTES==0] (ADD_EXTRA_BYTES):
Define as no-op.
* malloc.c (GC_generic_malloc_inner): Define lb_adjusted local
variable; pass lb_adjusted to GC_alloc_large_and_clear().
* malloc.c [MAX_EXTRA_BYTES>0] (GC_generic_malloc_inner): Set
lb_adjusted to lb if IGNORE_OFF_PAGE flag is set and lb is not less
than HBLKSIZE.
* malloc.c [MAX_EXTRA_BYTES>0] (GC_generic_malloc_aligned): Set
lb_rounded without EXTRA_BYTES added (and compute lg based on
lb_rounded) if IGNORE_OFF_PAGE is set and lb is not less than HBLKSIZE.
* mallocx.c (GC_realloc): Define ok local variable.
* typd_mlc.c (GC_malloc_explicitly_typed_ignore_off_page): Remove
lb_adjusted local variable; call GC_malloc_explicitly_typed() if
lb is smaller than HBLKSIZE-sizeof(word), otherwise pass lb plus
sizeof(word) (instead of lb plus TYPD_EXTRA_BYTES) to
GC_generic_malloc_aligned; add comment.

Run Details

24 of 24 new or added lines in 4 files covered. (100.0%)

7765 of 10150 relevant lines covered (76.5%)

8458785.63 hits per line

Source File
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89.58

/mallocx.c

/*
 * 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 by Hewlett-Packard Company.  All rights reserved.
 * Copyright (c) 2009-2022 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_priv.h"

/*
 * These are extra allocation routines which are likely to be less
 * frequently used than those in malloc.c.  They are separate in the
 * hope that the .o file will be excluded from statically linked
 * executables.  We should probably break this up further.
 */

#include <string.h>

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

/* Some externally visible but unadvertised variables to allow access to */
/* free lists from inlined allocators without including gc_priv.h        */
/* or introducing dependencies on internal data structure layouts.       */
#include "private/gc_alloc_ptrs.h"
void ** const GC_objfreelist_ptr = GC_objfreelist;
void ** const GC_aobjfreelist_ptr = GC_aobjfreelist;
void ** const GC_uobjfreelist_ptr = GC_uobjfreelist;
# ifdef GC_ATOMIC_UNCOLLECTABLE
    void ** const GC_auobjfreelist_ptr = GC_auobjfreelist;
# endif

GC_API int GC_CALL GC_get_kind_and_size(const void * p, size_t * psize)
{
    hdr * hhdr = HDR(p);

    if (psize != NULL) {
        *psize = (size_t)hhdr->hb_sz;
    }
    return hhdr -> hb_obj_kind;
}

GC_API GC_ATTR_MALLOC void * GC_CALL GC_generic_or_special_malloc(size_t lb,
                                                                  int k)
{
    switch (k) {
        case PTRFREE:
        case NORMAL:
            return GC_malloc_kind(lb, k);
        case UNCOLLECTABLE:
#       ifdef GC_ATOMIC_UNCOLLECTABLE
          case AUNCOLLECTABLE:
#       endif
            return GC_generic_malloc_uncollectable(lb, k);
        default:
            return GC_generic_malloc_aligned(lb, k, 0 /* flags */, 0);
    }
}

/* Change the size of the block pointed to by p to contain at least   */
/* lb bytes.  The object may be (and quite likely will be) moved.     */
/* The kind (e.g. atomic) is the same as that of the old.             */
/* Shrinking of large blocks is not implemented well.                 */
GC_API void * GC_CALL GC_realloc(void * p, size_t lb)
{
    struct hblk * h;
    hdr * hhdr;
    void * result;
#   if defined(_FORTIFY_SOURCE) && defined(__GNUC__) && !defined(__clang__)
      volatile  /* Use cleared_p instead of p as a workaround to avoid  */
                /* passing alloc_size(lb) attribute associated with p   */
                /* to memset (including memset call inside GC_free).    */
#   endif
      word cleared_p = (word)p;
    size_t sz;      /* Current size in bytes    */
    size_t orig_sz; /* Original sz in bytes     */
    int obj_kind;

    if (NULL == p) return GC_malloc(lb);  /* Required by ANSI */
    if (0 == lb) /* and p != NULL */ {
#     ifndef IGNORE_FREE
        GC_free(p);
#     endif
      return NULL;
    }
    h = HBLKPTR(p);
    hhdr = HDR(h);
    sz = (size_t)hhdr->hb_sz;
    obj_kind = hhdr -> hb_obj_kind;
    orig_sz = sz;

    if (sz > MAXOBJBYTES) {
        struct obj_kind * ok = &GC_obj_kinds[obj_kind];
        word descr = ok -> ok_descriptor;

        /* Round it up to the next whole heap block.    */
        sz = (sz + HBLKSIZE-1) & ~(HBLKSIZE-1);
#       if ALIGNMENT > GC_DS_TAGS
          /* An extra byte is not added in case of ignore-off-page  */
          /* allocated objects not smaller than HBLKSIZE.           */
          GC_ASSERT(sz >= HBLKSIZE);
          if (EXTRA_BYTES != 0 && (hhdr -> hb_flags & IGNORE_OFF_PAGE) != 0
              && obj_kind == NORMAL)
            descr += ALIGNMENT; /* or set to 0 */
#       endif
        if (ok -> ok_relocate_descr)
          descr += sz;
        /* GC_realloc might be changing the block size while            */
        /* GC_reclaim_block or GC_clear_hdr_marks is examining it.      */
        /* The change to the size field is benign, in that GC_reclaim   */
        /* (and GC_clear_hdr_marks) would work correctly with either    */
        /* value, since we are not changing the number of objects in    */
        /* the block.  But seeing a half-updated value (though unlikely */
        /* to occur in practice) could be probably bad.                 */
        /* Using unordered atomic accesses on the size and hb_descr     */
        /* fields would solve the issue.  (The alternate solution might */
        /* be to initially overallocate large objects, so we do not     */
        /* have to adjust the size in GC_realloc, if they still fit.    */
        /* But that is probably more expensive, since we may end up     */
        /* scanning a bunch of zeros during GC.)                        */
#       ifdef AO_HAVE_store
          GC_STATIC_ASSERT(sizeof(hhdr->hb_sz) == sizeof(AO_t));
          AO_store((volatile AO_t *)&hhdr->hb_sz, (AO_t)sz);
          AO_store((volatile AO_t *)&hhdr->hb_descr, (AO_t)descr);
#       else
          {
            LOCK();
            hhdr -> hb_sz = sz;
            hhdr -> hb_descr = descr;
            UNLOCK();
          }
#       endif

#         ifdef MARK_BIT_PER_OBJ
            GC_ASSERT(hhdr -> hb_inv_sz == LARGE_INV_SZ);
#         endif
#         ifdef MARK_BIT_PER_GRANULE
            GC_ASSERT((hhdr -> hb_flags & LARGE_BLOCK) != 0
                        && hhdr -> hb_map[ANY_INDEX] == 1);
#         endif
          if (IS_UNCOLLECTABLE(obj_kind)) GC_non_gc_bytes += (sz - orig_sz);
          /* Extra area is already cleared by GC_alloc_large_and_clear. */
    }
    if (ADD_EXTRA_BYTES(lb) <= sz) {
        if (lb >= (sz >> 1)) {
            if (orig_sz > lb) {
              /* Clear unneeded part of object to avoid bogus pointer */
              /* tracing.                                             */
                BZERO((ptr_t)cleared_p + lb, orig_sz - lb);
            }
            return p;
        }
        /* shrink */
        sz = lb;
    }
    result = GC_generic_or_special_malloc((word)lb, obj_kind);
    if (EXPECT(result != NULL, TRUE)) {
      /* In case of shrink, it could also return original object.       */
      /* But this gives the client warning of imminent disaster.        */
      BCOPY(p, result, sz);
#     ifndef IGNORE_FREE
        GC_free((ptr_t)cleared_p);
#     endif
    }
    return result;
}

# if defined(REDIRECT_MALLOC) && !defined(REDIRECT_REALLOC)
#   define REDIRECT_REALLOC GC_realloc
# endif

# ifdef REDIRECT_REALLOC

/* As with malloc, avoid two levels of extra calls here.        */
# define GC_debug_realloc_replacement(p, lb) \
        GC_debug_realloc(p, lb, GC_DBG_EXTRAS)

# if !defined(REDIRECT_MALLOC_IN_HEADER)
    void * realloc(void * p, size_t lb)
    {
      return REDIRECT_REALLOC(p, lb);
    }
# endif

# undef GC_debug_realloc_replacement
# endif /* REDIRECT_REALLOC */

/* Allocate memory such that only pointers to near the          */
/* beginning of the object are considered.                      */
/* We avoid holding allocation lock while we clear the memory.  */
GC_API GC_ATTR_MALLOC void * GC_CALL
    GC_generic_malloc_ignore_off_page(size_t lb, int k)
{
  return GC_generic_malloc_aligned(lb, k, IGNORE_OFF_PAGE, 0 /* align_m1 */);
}

GC_API GC_ATTR_MALLOC void * GC_CALL GC_malloc_ignore_off_page(size_t lb)
{
    return GC_generic_malloc_aligned(lb, NORMAL, IGNORE_OFF_PAGE, 0);
}

GC_API GC_ATTR_MALLOC void * GC_CALL
    GC_malloc_atomic_ignore_off_page(size_t lb)
{
    return GC_generic_malloc_aligned(lb, PTRFREE, IGNORE_OFF_PAGE, 0);
}

/* Increment GC_bytes_allocd from code that doesn't have direct access  */
/* to GC_arrays.                                                        */
void GC_CALL GC_incr_bytes_allocd(size_t n)
{
    GC_bytes_allocd += n;
}

/* The same for GC_bytes_freed.                         */
void GC_CALL GC_incr_bytes_freed(size_t n)
{
    GC_bytes_freed += n;
}

GC_API size_t GC_CALL GC_get_expl_freed_bytes_since_gc(void)
{
    return (size_t)GC_bytes_freed;
}

# ifdef PARALLEL_MARK
    STATIC volatile AO_t GC_bytes_allocd_tmp = 0;
                        /* Number of bytes of memory allocated since    */
                        /* we released the GC lock.  Instead of         */
                        /* reacquiring the GC lock just to add this in, */
                        /* we add it in the next time we reacquire      */
                        /* the lock.  (Atomically adding it doesn't     */
                        /* work, since we would have to atomically      */
                        /* update it in GC_malloc, which is too         */
                        /* expensive.)                                  */
# endif /* PARALLEL_MARK */

/* Return a list of 1 or more objects of the indicated size, linked     */
/* through the first word in the object.  This has the advantage that   */
/* it acquires the allocation lock only once, and may greatly reduce    */
/* time wasted contending for the allocation lock.  Typical usage would */
/* be in a thread that requires many items of the same size.  It would  */
/* keep its own free list in thread-local storage, and call             */
/* GC_malloc_many or friends to replenish it.  (We do not round up      */
/* object sizes, since a call indicates the intention to consume many   */
/* objects of exactly this size.)                                       */
/* We assume that the size is a multiple of GRANULE_BYTES.              */
/* We return the free-list by assigning it to *result, since it is      */
/* not safe to return, e.g. a linked list of pointer-free objects,      */
/* since the collector would not retain the entire list if it were      */
/* invoked just as we were returning.                                   */
/* Note that the client should usually clear the link field.            */
GC_API void GC_CALL GC_generic_malloc_many(size_t lb, int k, void **result)
{
    void *op;
    void *p;
    void **opp;
    size_t lw;      /* Length in words.     */
    size_t lg;      /* Length in granules.  */
    signed_word my_bytes_allocd = 0;
    struct obj_kind * ok;
    struct hblk ** rlh;

    GC_ASSERT(lb != 0 && (lb & (GRANULE_BYTES-1)) == 0);
    /* Currently a single object is always allocated if manual VDB. */
    /* TODO: GC_dirty should be called for each linked object (but  */
    /* the last one) to support multiple objects allocation.        */
    if (!SMALL_OBJ(lb) || GC_manual_vdb) {
        op = GC_generic_malloc_aligned(lb, k, 0 /* flags */, 0 /* align_m1 */);
        if (EXPECT(0 != op, TRUE))
            obj_link(op) = 0;
        *result = op;
#       ifndef GC_DISABLE_INCREMENTAL
          if (GC_manual_vdb && GC_is_heap_ptr(result)) {
            GC_dirty_inner(result);
            REACHABLE_AFTER_DIRTY(op);
          }
#       endif
        return;
    }
    GC_ASSERT(k < MAXOBJKINDS);
    lw = BYTES_TO_WORDS(lb);
    lg = BYTES_TO_GRANULES(lb);
    if (EXPECT(get_have_errors(), FALSE))
      GC_print_all_errors();
    GC_INVOKE_FINALIZERS();
    GC_DBG_COLLECT_AT_MALLOC(lb);
    if (!EXPECT(GC_is_initialized, TRUE)) GC_init();
    LOCK();
    /* Do our share of marking work */
      if (GC_incremental && !GC_dont_gc) {
        ENTER_GC();
        GC_collect_a_little_inner(1);
        EXIT_GC();
      }
    /* First see if we can reclaim a page of objects waiting to be */
    /* reclaimed.                                                  */
    ok = &GC_obj_kinds[k];
    rlh = ok -> ok_reclaim_list;
    if (rlh != NULL) {
        struct hblk * hbp;
        hdr * hhdr;

        while ((hbp = rlh[lg]) != NULL) {
            hhdr = HDR(hbp);
            rlh[lg] = hhdr -> hb_next;
            GC_ASSERT(hhdr -> hb_sz == lb);
            hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
#           ifdef PARALLEL_MARK
              if (GC_parallel) {
                  signed_word my_bytes_allocd_tmp =
                                (signed_word)AO_load(&GC_bytes_allocd_tmp);
                  GC_ASSERT(my_bytes_allocd_tmp >= 0);
                  /* We only decrement it while holding the GC lock.    */
                  /* Thus we can't accidentally adjust it down in more  */
                  /* than one thread simultaneously.                    */

                  if (my_bytes_allocd_tmp != 0) {
                    (void)AO_fetch_and_add(&GC_bytes_allocd_tmp,
                                           (AO_t)(-my_bytes_allocd_tmp));
                    GC_bytes_allocd += my_bytes_allocd_tmp;
                  }
                  GC_acquire_mark_lock();
                  ++ GC_fl_builder_count;
                  UNLOCK();
                  GC_release_mark_lock();
              }
#           endif
            op = GC_reclaim_generic(hbp, hhdr, lb,
                                    ok -> ok_init, 0, &my_bytes_allocd);
            if (op != 0) {
#             ifdef PARALLEL_MARK
                if (GC_parallel) {
                  *result = op;
                  (void)AO_fetch_and_add(&GC_bytes_allocd_tmp,
                                         (AO_t)my_bytes_allocd);
                  GC_acquire_mark_lock();
                  -- GC_fl_builder_count;
                  if (GC_fl_builder_count == 0) GC_notify_all_builder();
#                 ifdef THREAD_SANITIZER
                    GC_release_mark_lock();
                    LOCK();
                    GC_bytes_found += my_bytes_allocd;
                    UNLOCK();
#                 else
                    GC_bytes_found += my_bytes_allocd;
                                        /* The result may be inaccurate. */
                    GC_release_mark_lock();
#                 endif
                  (void) GC_clear_stack(0);
                  return;
                }
#             endif
              /* We also reclaimed memory, so we need to adjust       */
              /* that count.                                          */
              GC_bytes_found += my_bytes_allocd;
              GC_bytes_allocd += my_bytes_allocd;
              goto out;
            }
#           ifdef PARALLEL_MARK
              if (GC_parallel) {
                GC_acquire_mark_lock();
                -- GC_fl_builder_count;
                if (GC_fl_builder_count == 0) GC_notify_all_builder();
                GC_release_mark_lock();
                LOCK();
                /* The GC lock is needed for reclaim list access.  We   */
                /* must decrement fl_builder_count before reacquiring   */
                /* the lock.  Hopefully this path is rare.              */

                rlh = ok -> ok_reclaim_list; /* reload rlh after locking */
                if (NULL == rlh) break;
              }
#           endif
        }
    }
    /* Next try to use prefix of global free list if there is one.      */
    /* We don't refill it, but we need to use it up before allocating   */
    /* a new block ourselves.                                           */
      opp = &(ok -> ok_freelist[lg]);
      if ((op = *opp) != NULL) {
        *opp = 0;
        my_bytes_allocd = 0;
        for (p = op; p != 0; p = obj_link(p)) {
          my_bytes_allocd += lb;
          if ((word)my_bytes_allocd >= HBLKSIZE) {
            *opp = obj_link(p);
            obj_link(p) = 0;
            break;
          }
        }
        GC_bytes_allocd += my_bytes_allocd;
        goto out;
      }
    /* Next try to allocate a new block worth of objects of this size.  */
    {
        struct hblk *h = GC_allochblk(lb, k, 0 /* flags */, 0 /* align_m1 */);

        if (h /* != NULL */) { /* CPPCHECK */
          if (IS_UNCOLLECTABLE(k)) GC_set_hdr_marks(HDR(h));
          GC_bytes_allocd += HBLKSIZE - HBLKSIZE % lb;
#         ifdef PARALLEL_MARK
            if (GC_parallel) {
              GC_acquire_mark_lock();
              ++ GC_fl_builder_count;
              UNLOCK();
              GC_release_mark_lock();

              op = GC_build_fl(h, lw,
                        (ok -> ok_init || GC_debugging_started), 0);

              *result = op;
              GC_acquire_mark_lock();
              -- GC_fl_builder_count;
              if (GC_fl_builder_count == 0) GC_notify_all_builder();
              GC_release_mark_lock();
              (void) GC_clear_stack(0);
              return;
            }
#         endif
          op = GC_build_fl(h, lw, (ok -> ok_init || GC_debugging_started), 0);
          goto out;
        }
    }

    /* As a last attempt, try allocating a single object.  Note that    */
    /* this may trigger a collection or expand the heap.                */
      op = GC_generic_malloc_inner(lb, k, 0 /* flags */);
      if (op != NULL) obj_link(op) = NULL;

  out:
    *result = op;
    UNLOCK();
    (void) GC_clear_stack(0);
}

/* Note that the "atomic" version of this would be unsafe, since the    */
/* links would not be seen by the collector.                            */
GC_API GC_ATTR_MALLOC void * GC_CALL GC_malloc_many(size_t lb)
{
    void *result;
    size_t lg = ALLOC_REQUEST_GRANS(lb);

    GC_generic_malloc_many(GRANULES_TO_BYTES(lg), NORMAL, &result);
    return result;
}

/* TODO: The debugging version of GC_memalign and friends is tricky     */
/* and currently missing.  There are 2 major difficulties:              */
/* - GC_base() should always point to the beginning of the allocated    */
/* block (thus, for small objects allocation we should probably         */
/* iterate over the list of free objects to find the one with the       */
/* suitable alignment);                                                 */
/* - store_debug_info() should return the pointer of the object with    */
/* the requested alignment (unlike the object header).                  */

GC_API GC_ATTR_MALLOC void * GC_CALL GC_memalign(size_t align, size_t lb)
{
    size_t offset;
    ptr_t result;
    size_t align_m1 = align - 1;

    /* Check the alignment argument.    */
    if (align < sizeof(void *) || (align & align_m1) != 0) return NULL;

    if (align <= GRANULE_BYTES) return GC_malloc(lb);

    if (align >= HBLKSIZE/2 || lb >= HBLKSIZE/2) {
      return GC_clear_stack(GC_generic_malloc_aligned(lb, NORMAL,
                                        0 /* flags */, align_m1));
    }

    /* We could also try to make sure that the real rounded-up object size */
    /* is a multiple of align.  That would be correct up to HBLKSIZE.      */
    /* TODO: Not space efficient for big align values. */
    result = (ptr_t)GC_malloc(SIZET_SAT_ADD(lb, align_m1));
            /* It is OK not to check result for NULL as in that case    */
            /* GC_memalign returns NULL too since (0 + 0 % align) is 0. */
    offset = (size_t)(word)result & align_m1;
    if (offset != 0) {
        offset = align - offset;
        if (!GC_all_interior_pointers) {
            GC_STATIC_ASSERT(VALID_OFFSET_SZ <= HBLKSIZE);
            GC_ASSERT(offset < VALID_OFFSET_SZ);
            GC_register_displacement(offset);
        }
        result += offset;
    }
    GC_ASSERT(((word)result & align_m1) == 0);
    return result;
}

/* This one exists largely to redirect posix_memalign for leaks finding. */
GC_API int GC_CALL GC_posix_memalign(void **memptr, size_t align, size_t lb)
{
  /* Check alignment properly.  */
  size_t align_minus_one = align - 1; /* to workaround a cppcheck warning */
  if (align < sizeof(void *) || (align_minus_one & align) != 0) {
#   ifdef MSWINCE
      return ERROR_INVALID_PARAMETER;
#   else
      return EINVAL;
#   endif
  }

  if ((*memptr = GC_memalign(align, lb)) == NULL) {
#   ifdef MSWINCE
      return ERROR_NOT_ENOUGH_MEMORY;
#   else
      return ENOMEM;
#   endif
  }
  return 0;
}

#ifndef GC_NO_VALLOC
  GC_API GC_ATTR_MALLOC void * GC_CALL GC_valloc(size_t lb)
  {
    if (!EXPECT(GC_is_initialized, TRUE)) GC_init();
    GC_ASSERT(GC_real_page_size != 0);
    return GC_memalign(GC_real_page_size, lb);
  }

  GC_API GC_ATTR_MALLOC void * GC_CALL GC_pvalloc(size_t lb)
  {
    if (!EXPECT(GC_is_initialized, TRUE)) GC_init();
    GC_ASSERT(GC_real_page_size != 0);
    lb = SIZET_SAT_ADD(lb, GC_real_page_size - 1) & ~(GC_real_page_size - 1);
    return GC_memalign(GC_real_page_size, lb);
  }
#endif /* !GC_NO_VALLOC */

/* Provide a version of strdup() that uses the collector to allocate    */
/* the copy of the string.                                              */
GC_API GC_ATTR_MALLOC char * GC_CALL GC_strdup(const char *s)
{
  char *copy;
  size_t lb;
  if (s == NULL) return NULL;
  lb = strlen(s) + 1;
  copy = (char *)GC_malloc_atomic(lb);
  if (EXPECT(NULL == copy, FALSE)) {
#   ifndef MSWINCE
      errno = ENOMEM;
#   endif
    return NULL;
  }
  BCOPY(s, copy, lb);
  return copy;
}

GC_API GC_ATTR_MALLOC char * GC_CALL GC_strndup(const char *str, size_t size)
{
  char *copy;
  size_t len = strlen(str); /* str is expected to be non-NULL  */
  if (EXPECT(len > size, FALSE))
    len = size;
  copy = (char *)GC_malloc_atomic(len + 1);
  if (EXPECT(NULL == copy, FALSE)) {
#   ifndef MSWINCE
      errno = ENOMEM;
#   endif
    return NULL;
  }
  if (EXPECT(len > 0, TRUE))
    BCOPY(str, copy, len);
  copy[len] = '\0';
  return copy;
}

#ifdef GC_REQUIRE_WCSDUP
# include <wchar.h> /* for wcslen() */

  GC_API GC_ATTR_MALLOC wchar_t * GC_CALL GC_wcsdup(const wchar_t *str)
  {
    size_t lb = (wcslen(str) + 1) * sizeof(wchar_t);
    wchar_t *copy = (wchar_t *)GC_malloc_atomic(lb);

    if (EXPECT(NULL == copy, FALSE)) {
#     ifndef MSWINCE
        errno = ENOMEM;
#     endif
      return NULL;
    }
    BCOPY(str, copy, lb);
    return copy;
  }
#endif /* GC_REQUIRE_WCSDUP */

#ifndef CPPCHECK
  GC_API void * GC_CALL GC_malloc_stubborn(size_t lb)
  {
    return GC_malloc(lb);
  }

  GC_API void GC_CALL GC_change_stubborn(const void *p)
  {
    UNUSED_ARG(p);
  }
#endif /* !CPPCHECK */

GC_API void GC_CALL GC_end_stubborn_change(const void *p)
{
  GC_dirty(p); /* entire object */
}

GC_API void GC_CALL GC_ptr_store_and_dirty(void *p, const void *q)
{
  *(const void **)p = q;
  GC_dirty(p);
  REACHABLE_AFTER_DIRTY(q);
}

ivmai / bdwgc / 1484

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