[PATCH v2 6/6] mingw: drop the rest of compat/nedmalloc/malloc.c.h

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

The third and final chunk removes the remainder of malloc.c.h, from
the "System allocation" banner to the end of the file, and the file
itself. With this commit the compat/nedmalloc/ directory is fully
retired from the tree.

Assisted-by: Opus 4.7
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 compat/nedmalloc/malloc.c.h | 1827 -----------------------------------
 1 file changed, 1827 deletions(-)
 delete mode 100644 compat/nedmalloc/malloc.c.h

diff --git a/compat/nedmalloc/malloc.c.h b/compat/nedmalloc/malloc.c.h
deleted file mode 100644
index 0c663cf49c..0000000000
--- a/compat/nedmalloc/malloc.c.h
+++ /dev/null
@@ -1,1827 +0,0 @@
-/* -------------------------- System allocation -------------------------- */
-
-/* Get memory from system using MORECORE or MMAP */
-static void* sys_alloc(mstate m, size_t nb) {
-  char* tbase = CMFAIL;
-  size_t tsize = 0;
-  flag_t mmap_flag = 0;
-
-  ensure_initialization();
-
-  /* Directly map large chunks */
-  if (use_mmap(m) && nb >= mparams.mmap_threshold) {
-    void* mem = mmap_alloc(m, nb);
-    if (mem != 0)
-      return mem;
-  }
-
-  /*
-    Try getting memory in any of three ways (in most-preferred to
-    least-preferred order):
-    1. A call to MORECORE that can normally contiguously extend memory.
-       (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or
-       main space is mmapped or a previous contiguous call failed)
-    2. A call to MMAP new space (disabled if not HAVE_MMAP).
-       Note that under the default settings, if MORECORE is unable to
-       fulfill a request, and HAVE_MMAP is true, then mmap is
-       used as a noncontiguous system allocator. This is a useful backup
-       strategy for systems with holes in address spaces -- in this case
-       sbrk cannot contiguously expand the heap, but mmap may be able to
-       find space.
-    3. A call to MORECORE that cannot usually contiguously extend memory.
-       (disabled if not HAVE_MORECORE)
-
-   In all cases, we need to request enough bytes from system to ensure
-   we can malloc nb bytes upon success, so pad with enough space for
-   top_foot, plus alignment-pad to make sure we don't lose bytes if
-   not on boundary, and round this up to a granularity unit.
-  */
-
-  if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) {
-    char* br = CMFAIL;
-    msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top);
-    size_t asize = 0;
-    ACQUIRE_MALLOC_GLOBAL_LOCK();
-
-    if (ss == 0) {  /* First time through or recovery */
-      char* base = (char*)CALL_MORECORE(0);
-      if (base != CMFAIL) {
-	asize = granularity_align(nb + SYS_ALLOC_PADDING);
-	/* Adjust to end on a page boundary */
-	if (!is_page_aligned(base))
-	  asize += (page_align((size_t)base) - (size_t)base);
-	/* Can't call MORECORE if size is negative when treated as signed */
-	if (asize < HALF_MAX_SIZE_T &&
-	    (br = (char*)(CALL_MORECORE(asize))) == base) {
-	  tbase = base;
-	  tsize = asize;
-	}
-      }
-    }
-    else {
-      /* Subtract out existing available top space from MORECORE request. */
-      asize = granularity_align(nb - m->topsize + SYS_ALLOC_PADDING);
-      /* Use mem here only if it did continuously extend old space */
-      if (asize < HALF_MAX_SIZE_T &&
-	  (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) {
-	tbase = br;
-	tsize = asize;
-      }
-    }
-
-    if (tbase == CMFAIL) {    /* Cope with partial failure */
-      if (br != CMFAIL) {    /* Try to use/extend the space we did get */
-	if (asize < HALF_MAX_SIZE_T &&
-	    asize < nb + SYS_ALLOC_PADDING) {
-	  size_t esize = granularity_align(nb + SYS_ALLOC_PADDING - asize);
-	  if (esize < HALF_MAX_SIZE_T) {
-	    char* end = (char*)CALL_MORECORE(esize);
-	    if (end != CMFAIL)
-	      asize += esize;
-	    else {            /* Can't use; try to release */
-	      (void) CALL_MORECORE(-asize);
-	      br = CMFAIL;
-	    }
-	  }
-	}
-      }
-      if (br != CMFAIL) {    /* Use the space we did get */
-	tbase = br;
-	tsize = asize;
-      }
-      else
-	disable_contiguous(m); /* Don't try contiguous path in the future */
-    }
-
-    RELEASE_MALLOC_GLOBAL_LOCK();
-  }
-
-  if (HAVE_MMAP && tbase == CMFAIL) {  /* Try MMAP */
-    size_t rsize = granularity_align(nb + SYS_ALLOC_PADDING);
-    if (rsize > nb) { /* Fail if wraps around zero */
-      char* mp = (char*)(CALL_MMAP(rsize));
-      if (mp != CMFAIL) {
-	tbase = mp;
-	tsize = rsize;
-	mmap_flag = IS_MMAPPED_BIT;
-      }
-    }
-  }
-
-  if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */
-    size_t asize = granularity_align(nb + SYS_ALLOC_PADDING);
-    if (asize < HALF_MAX_SIZE_T) {
-      char* br = CMFAIL;
-      char* end = CMFAIL;
-      ACQUIRE_MALLOC_GLOBAL_LOCK();
-      br = (char*)(CALL_MORECORE(asize));
-      end = (char*)(CALL_MORECORE(0));
-      RELEASE_MALLOC_GLOBAL_LOCK();
-      if (br != CMFAIL && end != CMFAIL && br < end) {
-	size_t ssize = end - br;
-	if (ssize > nb + TOP_FOOT_SIZE) {
-	  tbase = br;
-	  tsize = ssize;
-	}
-      }
-    }
-  }
-
-  if (tbase != CMFAIL) {
-
-    if ((m->footprint += tsize) > m->max_footprint)
-      m->max_footprint = m->footprint;
-
-    if (!is_initialized(m)) { /* first-time initialization */
-      m->seg.base = m->least_addr = tbase;
-      m->seg.size = tsize;
-      m->seg.sflags = mmap_flag;
-      m->magic = mparams.magic;
-      m->release_checks = MAX_RELEASE_CHECK_RATE;
-      init_bins(m);
-#if !ONLY_MSPACES
-      if (is_global(m))
-	init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
-      else
-#endif
-      {
-	/* Offset top by embedded malloc_state */
-	mchunkptr mn = next_chunk(mem2chunk(m));
-	init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE);
-      }
-    }
-
-    else {
-      /* Try to merge with an existing segment */
-      msegmentptr sp = &m->seg;
-      /* Only consider most recent segment if traversal suppressed */
-      while (sp != 0 && tbase != sp->base + sp->size)
-	sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
-      if (sp != 0 &&
-	  !is_extern_segment(sp) &&
-	  (sp->sflags & IS_MMAPPED_BIT) == mmap_flag &&
-	  segment_holds(sp, m->top)) { /* append */
-	sp->size += tsize;
-	init_top(m, m->top, m->topsize + tsize);
-      }
-      else {
-	if (tbase < m->least_addr)
-	  m->least_addr = tbase;
-	sp = &m->seg;
-	while (sp != 0 && sp->base != tbase + tsize)
-	  sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
-	if (sp != 0 &&
-	    !is_extern_segment(sp) &&
-	    (sp->sflags & IS_MMAPPED_BIT) == mmap_flag) {
-	  char* oldbase = sp->base;
-	  sp->base = tbase;
-	  sp->size += tsize;
-	  return prepend_alloc(m, tbase, oldbase, nb);
-	}
-	else
-	  add_segment(m, tbase, tsize, mmap_flag);
-      }
-    }
-
-    if (nb < m->topsize) { /* Allocate from new or extended top space */
-      size_t rsize = m->topsize -= nb;
-      mchunkptr p = m->top;
-      mchunkptr r = m->top = chunk_plus_offset(p, nb);
-      r->head = rsize | PINUSE_BIT;
-      set_size_and_pinuse_of_inuse_chunk(m, p, nb);
-      check_top_chunk(m, m->top);
-      check_malloced_chunk(m, chunk2mem(p), nb);
-      return chunk2mem(p);
-    }
-  }
-
-  MALLOC_FAILURE_ACTION;
-  return 0;
-}
-
-/* -----------------------  system deallocation -------------------------- */
-
-/* Unmap and unlink any mmapped segments that don't contain used chunks */
-static size_t release_unused_segments(mstate m) {
-  size_t released = 0;
-  int nsegs = 0;
-  msegmentptr pred = &m->seg;
-  msegmentptr sp = pred->next;
-  while (sp != 0) {
-    char* base = sp->base;
-    size_t size = sp->size;
-    msegmentptr next = sp->next;
-    ++nsegs;
-    if (is_mmapped_segment(sp) && !is_extern_segment(sp)) {
-      mchunkptr p = align_as_chunk(base);
-      size_t psize = chunksize(p);
-      /* Can unmap if first chunk holds entire segment and not pinned */
-      if (!cinuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) {
-	tchunkptr tp = (tchunkptr)p;
-	assert(segment_holds(sp, (char*)sp));
-	if (p == m->dv) {
-	  m->dv = 0;
-	  m->dvsize = 0;
-	}
-	else {
-	  unlink_large_chunk(m, tp);
-	}
-	if (CALL_MUNMAP(base, size) == 0) {
-	  released += size;
-	  m->footprint -= size;
-	  /* unlink obsoleted record */
-	  sp = pred;
-	  sp->next = next;
-	}
-	else { /* back out if cannot unmap */
-	  insert_large_chunk(m, tp, psize);
-	}
-      }
-    }
-    if (NO_SEGMENT_TRAVERSAL) /* scan only first segment */
-      break;
-    pred = sp;
-    sp = next;
-  }
-  /* Reset check counter */
-  m->release_checks = ((nsegs > MAX_RELEASE_CHECK_RATE)?
-		       nsegs : MAX_RELEASE_CHECK_RATE);
-  return released;
-}
-
-static int sys_trim(mstate m, size_t pad) {
-  size_t released = 0;
-  ensure_initialization();
-  if (pad < MAX_REQUEST && is_initialized(m)) {
-    pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */
-
-    if (m->topsize > pad) {
-      /* Shrink top space in granularity-size units, keeping at least one */
-      size_t unit = mparams.granularity;
-      size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit -
-		      SIZE_T_ONE) * unit;
-      msegmentptr sp = segment_holding(m, (char*)m->top);
-
-      if (!is_extern_segment(sp)) {
-	if (is_mmapped_segment(sp)) {
-	  if (HAVE_MMAP &&
-	      sp->size >= extra &&
-	      !has_segment_link(m, sp)) { /* can't shrink if pinned */
-	    size_t newsize = sp->size - extra;
-	    /* Prefer mremap, fall back to munmap */
-	    if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) ||
-		(CALL_MUNMAP(sp->base + newsize, extra) == 0)) {
-	      released = extra;
-	    }
-	  }
-	}
-	else if (HAVE_MORECORE) {
-	  if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */
-	    extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit;
-	  ACQUIRE_MALLOC_GLOBAL_LOCK();
-	  {
-	    /* Make sure end of memory is where we last set it. */
-	    char* old_br = (char*)(CALL_MORECORE(0));
-	    if (old_br == sp->base + sp->size) {
-	      char* rel_br = (char*)(CALL_MORECORE(-extra));
-	      char* new_br = (char*)(CALL_MORECORE(0));
-	      if (rel_br != CMFAIL && new_br < old_br)
-		released = old_br - new_br;
-	    }
-	  }
-	  RELEASE_MALLOC_GLOBAL_LOCK();
-	}
-      }
-
-      if (released != 0) {
-	sp->size -= released;
-	m->footprint -= released;
-	init_top(m, m->top, m->topsize - released);
-	check_top_chunk(m, m->top);
-      }
-    }
-
-    /* Unmap any unused mmapped segments */
-    if (HAVE_MMAP)
-      released += release_unused_segments(m);
-
-    /* On failure, disable autotrim to avoid repeated failed future calls */
-    if (released == 0 && m->topsize > m->trim_check)
-      m->trim_check = MAX_SIZE_T;
-  }
-
-  return (released != 0)? 1 : 0;
-}
-
-
-/* ---------------------------- malloc support --------------------------- */
-
-/* allocate a large request from the best fitting chunk in a treebin */
-static void* tmalloc_large(mstate m, size_t nb) {
-  tchunkptr v = 0;
-  size_t rsize = -nb; /* Unsigned negation */
-  tchunkptr t;
-  bindex_t idx;
-  compute_tree_index(nb, idx);
-  if ((t = *treebin_at(m, idx)) != 0) {
-    /* Traverse tree for this bin looking for node with size == nb */
-    size_t sizebits = nb << leftshift_for_tree_index(idx);
-    tchunkptr rst = 0;  /* The deepest untaken right subtree */
-    for (;;) {
-      tchunkptr rt;
-      size_t trem = chunksize(t) - nb;
-      if (trem < rsize) {
-	v = t;
-	if ((rsize = trem) == 0)
-	  break;
-      }
-      rt = t->child[1];
-      t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
-      if (rt != 0 && rt != t)
-	rst = rt;
-      if (t == 0) {
-	t = rst; /* set t to least subtree holding sizes > nb */
-	break;
-      }
-      sizebits <<= 1;
-    }
-  }
-  if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */
-    binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap;
-    if (leftbits != 0) {
-      bindex_t i;
-      binmap_t leastbit = least_bit(leftbits);
-      compute_bit2idx(leastbit, i);
-      t = *treebin_at(m, i);
-    }
-  }
-
-  while (t != 0) { /* find smallest of tree or subtree */
-    size_t trem = chunksize(t) - nb;
-    if (trem < rsize) {
-      rsize = trem;
-      v = t;
-    }
-    t = leftmost_child(t);
-  }
-
-  /*  If dv is a better fit, return 0 so malloc will use it */
-  if (v != 0 && rsize < (size_t)(m->dvsize - nb)) {
-    if (RTCHECK(ok_address(m, v))) { /* split */
-      mchunkptr r = chunk_plus_offset(v, nb);
-      assert(chunksize(v) == rsize + nb);
-      if (RTCHECK(ok_next(v, r))) {
-	unlink_large_chunk(m, v);
-	if (rsize < MIN_CHUNK_SIZE)
-	  set_inuse_and_pinuse(m, v, (rsize + nb));
-	else {
-	  set_size_and_pinuse_of_inuse_chunk(m, v, nb);
-	  set_size_and_pinuse_of_free_chunk(r, rsize);
-	  insert_chunk(m, r, rsize);
-	}
-	return chunk2mem(v);
-      }
-    }
-    CORRUPTION_ERROR_ACTION(m);
-  }
-  return 0;
-}
-
-/* allocate a small request from the best fitting chunk in a treebin */
-static void* tmalloc_small(mstate m, size_t nb) {
-  tchunkptr t, v;
-  size_t rsize;
-  bindex_t i;
-  binmap_t leastbit = least_bit(m->treemap);
-  compute_bit2idx(leastbit, i);
-  v = t = *treebin_at(m, i);
-  rsize = chunksize(t) - nb;
-
-  while ((t = leftmost_child(t)) != 0) {
-    size_t trem = chunksize(t) - nb;
-    if (trem < rsize) {
-      rsize = trem;
-      v = t;
-    }
-  }
-
-  if (RTCHECK(ok_address(m, v))) {
-    mchunkptr r = chunk_plus_offset(v, nb);
-    assert(chunksize(v) == rsize + nb);
-    if (RTCHECK(ok_next(v, r))) {
-      unlink_large_chunk(m, v);
-      if (rsize < MIN_CHUNK_SIZE)
-	set_inuse_and_pinuse(m, v, (rsize + nb));
-      else {
-	set_size_and_pinuse_of_inuse_chunk(m, v, nb);
-	set_size_and_pinuse_of_free_chunk(r, rsize);
-	replace_dv(m, r, rsize);
-      }
-      return chunk2mem(v);
-    }
-  }
-
-  CORRUPTION_ERROR_ACTION(m);
-  return 0;
-}
-
-/* --------------------------- realloc support --------------------------- */
-
-static void* internal_realloc(mstate m, void* oldmem, size_t bytes) {
-  if (bytes >= MAX_REQUEST) {
-    MALLOC_FAILURE_ACTION;
-    return 0;
-  }
-  if (!PREACTION(m)) {
-    mchunkptr oldp = mem2chunk(oldmem);
-    size_t oldsize = chunksize(oldp);
-    mchunkptr next = chunk_plus_offset(oldp, oldsize);
-    mchunkptr newp = 0;
-    void* extra = 0;
-
-    /* Try to either shrink or extend into top. Else malloc-copy-free */
-
-    if (RTCHECK(ok_address(m, oldp) && ok_cinuse(oldp) &&
-		ok_next(oldp, next) && ok_pinuse(next))) {
-      size_t nb = request2size(bytes);
-      if (is_mmapped(oldp))
-	newp = mmap_resize(m, oldp, nb);
-      else if (oldsize >= nb) { /* already big enough */
-	size_t rsize = oldsize - nb;
-	newp = oldp;
-	if (rsize >= MIN_CHUNK_SIZE) {
-	  mchunkptr remainder = chunk_plus_offset(newp, nb);
-	  set_inuse(m, newp, nb);
-	  set_inuse(m, remainder, rsize);
-	  extra = chunk2mem(remainder);
-	}
-      }
-      else if (next == m->top && oldsize + m->topsize > nb) {
-	/* Expand into top */
-	size_t newsize = oldsize + m->topsize;
-	size_t newtopsize = newsize - nb;
-	mchunkptr newtop = chunk_plus_offset(oldp, nb);
-	set_inuse(m, oldp, nb);
-	newtop->head = newtopsize |PINUSE_BIT;
-	m->top = newtop;
-	m->topsize = newtopsize;
-	newp = oldp;
-      }
-    }
-    else {
-      USAGE_ERROR_ACTION(m, oldmem);
-      POSTACTION(m);
-      return 0;
-    }
-
-    POSTACTION(m);
-
-    if (newp != 0) {
-      if (extra != 0) {
-	internal_free(m, extra);
-      }
-      check_inuse_chunk(m, newp);
-      return chunk2mem(newp);
-    }
-    else {
-      void* newmem = internal_malloc(m, bytes);
-      if (newmem != 0) {
-	size_t oc = oldsize - overhead_for(oldp);
-	memcpy(newmem, oldmem, (oc < bytes)? oc : bytes);
-	internal_free(m, oldmem);
-      }
-      return newmem;
-    }
-  }
-  return 0;
-}
-
-/* --------------------------- memalign support -------------------------- */
-
-static void* internal_memalign(mstate m, size_t alignment, size_t bytes) {
-  if (alignment <= MALLOC_ALIGNMENT)    /* Can just use malloc */
-    return internal_malloc(m, bytes);
-  if (alignment <  MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */
-    alignment = MIN_CHUNK_SIZE;
-  if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */
-    size_t a = MALLOC_ALIGNMENT << 1;
-    while (a < alignment) a <<= 1;
-    alignment = a;
-  }
-
-  if (bytes >= MAX_REQUEST - alignment) {
-    if (m != 0)  { /* Test isn't needed but avoids compiler warning */
-      MALLOC_FAILURE_ACTION;
-    }
-  }
-  else {
-    size_t nb = request2size(bytes);
-    size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD;
-    char* mem = (char*)internal_malloc(m, req);
-    if (mem != 0) {
-      void* leader = 0;
-      void* trailer = 0;
-      mchunkptr p = mem2chunk(mem);
-
-      if (PREACTION(m)) return 0;
-      if ((((size_t)(mem)) % alignment) != 0) { /* misaligned */
-	/*
-	  Find an aligned spot inside chunk.  Since we need to give
-	  back leading space in a chunk of at least MIN_CHUNK_SIZE, if
-	  the first calculation places us at a spot with less than
-	  MIN_CHUNK_SIZE leader, we can move to the next aligned spot.
-	  We've allocated enough total room so that this is always
-	  possible.
-	*/
-	char* br = (char*)mem2chunk((size_t)(((size_t)(mem +
-						       alignment -
-						       SIZE_T_ONE)) &
-					     -alignment));
-	char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)?
-	  br : br+alignment;
-	mchunkptr newp = (mchunkptr)pos;
-	size_t leadsize = pos - (char*)(p);
-	size_t newsize = chunksize(p) - leadsize;
-
-	if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */
-	  newp->prev_foot = p->prev_foot + leadsize;
-	  newp->head = (newsize|CINUSE_BIT);
-	}
-	else { /* Otherwise, give back leader, use the rest */
-	  set_inuse(m, newp, newsize);
-	  set_inuse(m, p, leadsize);
-	  leader = chunk2mem(p);
-	}
-	p = newp;
-      }
-
-      /* Give back spare room at the end */
-      if (!is_mmapped(p)) {
-	size_t size = chunksize(p);
-	if (size > nb + MIN_CHUNK_SIZE) {
-	  size_t remainder_size = size - nb;
-	  mchunkptr remainder = chunk_plus_offset(p, nb);
-	  set_inuse(m, p, nb);
-	  set_inuse(m, remainder, remainder_size);
-	  trailer = chunk2mem(remainder);
-	}
-      }
-
-      assert (chunksize(p) >= nb);
-      assert((((size_t)(chunk2mem(p))) % alignment) == 0);
-      check_inuse_chunk(m, p);
-      POSTACTION(m);
-      if (leader != 0) {
-	internal_free(m, leader);
-      }
-      if (trailer != 0) {
-	internal_free(m, trailer);
-      }
-      return chunk2mem(p);
-    }
-  }
-  return 0;
-}
-
-/* ------------------------ comalloc/coalloc support --------------------- */
-
-static void** ialloc(mstate m,
-		     size_t n_elements,
-		     size_t* sizes,
-		     int opts,
-		     void* chunks[]) {
-  /*
-    This provides common support for independent_X routines, handling
-    all of the combinations that can result.
-
-    The opts arg has:
-    bit 0 set if all elements are same size (using sizes[0])
-    bit 1 set if elements should be zeroed
-  */
-
-  size_t    element_size;   /* chunksize of each element, if all same */
-  size_t    contents_size;  /* total size of elements */
-  size_t    array_size;     /* request size of pointer array */
-  void*     mem;            /* malloced aggregate space */
-  mchunkptr p;              /* corresponding chunk */
-  size_t    remainder_size; /* remaining bytes while splitting */
-  void**    marray;         /* either "chunks" or malloced ptr array */
-  mchunkptr array_chunk;    /* chunk for malloced ptr array */
-  flag_t    was_enabled;    /* to disable mmap */
-  size_t    size;
-  size_t    i;
-
-  ensure_initialization();
-  /* compute array length, if needed */
-  if (chunks != 0) {
-    if (n_elements == 0)
-      return chunks; /* nothing to do */
-    marray = chunks;
-    array_size = 0;
-  }
-  else {
-    /* if empty req, must still return chunk representing empty array */
-    if (n_elements == 0)
-      return (void**)internal_malloc(m, 0);
-    marray = 0;
-    array_size = request2size(n_elements * (sizeof(void*)));
-  }
-
-  /* compute total element size */
-  if (opts & 0x1) { /* all-same-size */
-    element_size = request2size(*sizes);
-    contents_size = n_elements * element_size;
-  }
-  else { /* add up all the sizes */
-    element_size = 0;
-    contents_size = 0;
-    for (i = 0; i != n_elements; ++i)
-      contents_size += request2size(sizes[i]);
-  }
-
-  size = contents_size + array_size;
-
-  /*
-     Allocate the aggregate chunk.  First disable direct-mmapping so
-     malloc won't use it, since we would not be able to later
-     free/realloc space internal to a segregated mmap region.
-  */
-  was_enabled = use_mmap(m);
-  disable_mmap(m);
-  mem = internal_malloc(m, size - CHUNK_OVERHEAD);
-  if (was_enabled)
-    enable_mmap(m);
-  if (mem == 0)
-    return 0;
-
-  if (PREACTION(m)) return 0;
-  p = mem2chunk(mem);
-  remainder_size = chunksize(p);
-
-  assert(!is_mmapped(p));
-
-  if (opts & 0x2) {       /* optionally clear the elements */
-    memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size);
-  }
-
-  /* If not provided, allocate the pointer array as final part of chunk */
-  if (marray == 0) {
-    size_t  array_chunk_size;
-    array_chunk = chunk_plus_offset(p, contents_size);
-    array_chunk_size = remainder_size - contents_size;
-    marray = (void**) (chunk2mem(array_chunk));
-    set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size);
-    remainder_size = contents_size;
-  }
-
-  /* split out elements */
-  for (i = 0; ; ++i) {
-    marray[i] = chunk2mem(p);
-    if (i != n_elements-1) {
-      if (element_size != 0)
-	size = element_size;
-      else
-	size = request2size(sizes[i]);
-      remainder_size -= size;
-      set_size_and_pinuse_of_inuse_chunk(m, p, size);
-      p = chunk_plus_offset(p, size);
-    }
-    else { /* the final element absorbs any overallocation slop */
-      set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size);
-      break;
-    }
-  }
-
-#if DEBUG
-  if (marray != chunks) {
-    /* final element must have exactly exhausted chunk */
-    if (element_size != 0) {
-      assert(remainder_size == element_size);
-    }
-    else {
-      assert(remainder_size == request2size(sizes[i]));
-    }
-    check_inuse_chunk(m, mem2chunk(marray));
-  }
-  for (i = 0; i != n_elements; ++i)
-    check_inuse_chunk(m, mem2chunk(marray[i]));
-
-#endif /* DEBUG */
-
-  POSTACTION(m);
-  return marray;
-}
-
-
-/* -------------------------- public routines ---------------------------- */
-
-#if !ONLY_MSPACES
-
-void* dlmalloc(size_t bytes) {
-  /*
-     Basic algorithm:
-     If a small request (< 256 bytes minus per-chunk overhead):
-       1. If one exists, use a remainderless chunk in associated smallbin.
-	  (Remainderless means that there are too few excess bytes to
-	  represent as a chunk.)
-       2. If it is big enough, use the dv chunk, which is normally the
-	  chunk adjacent to the one used for the most recent small request.
-       3. If one exists, split the smallest available chunk in a bin,
-	  saving remainder in dv.
-       4. If it is big enough, use the top chunk.
-       5. If available, get memory from system and use it
-     Otherwise, for a large request:
-       1. Find the smallest available binned chunk that fits, and use it
-	  if it is better fitting than dv chunk, splitting if necessary.
-       2. If better fitting than any binned chunk, use the dv chunk.
-       3. If it is big enough, use the top chunk.
-       4. If request size >= mmap threshold, try to directly mmap this chunk.
-       5. If available, get memory from system and use it
-
-     The ugly goto's here ensure that postaction occurs along all paths.
-  */
-
-#if USE_LOCKS
-  ensure_initialization(); /* initialize in sys_alloc if not using locks */
-#endif
-
-  if (!PREACTION(gm)) {
-    void* mem;
-    size_t nb;
-    if (bytes <= MAX_SMALL_REQUEST) {
-      bindex_t idx;
-      binmap_t smallbits;
-      nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
-      idx = small_index(nb);
-      smallbits = gm->smallmap >> idx;
-
-      if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
-	mchunkptr b, p;
-	idx += ~smallbits & 1;       /* Uses next bin if idx empty */
-	b = smallbin_at(gm, idx);
-	p = b->fd;
-	assert(chunksize(p) == small_index2size(idx));
-	unlink_first_small_chunk(gm, b, p, idx);
-	set_inuse_and_pinuse(gm, p, small_index2size(idx));
-	mem = chunk2mem(p);
-	check_malloced_chunk(gm, mem, nb);
-	goto postaction;
-      }
-
-      else if (nb > gm->dvsize) {
-	if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
-	  mchunkptr b, p, r;
-	  size_t rsize;
-	  bindex_t i;
-	  binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
-	  binmap_t leastbit = least_bit(leftbits);
-	  compute_bit2idx(leastbit, i);
-	  b = smallbin_at(gm, i);
-	  p = b->fd;
-	  assert(chunksize(p) == small_index2size(i));
-	  unlink_first_small_chunk(gm, b, p, i);
-	  rsize = small_index2size(i) - nb;
-	  /* Fit here cannot be remainderless if 4byte sizes */
-	  if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
-	    set_inuse_and_pinuse(gm, p, small_index2size(i));
-	  else {
-	    set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
-	    r = chunk_plus_offset(p, nb);
-	    set_size_and_pinuse_of_free_chunk(r, rsize);
-	    replace_dv(gm, r, rsize);
-	  }
-	  mem = chunk2mem(p);
-	  check_malloced_chunk(gm, mem, nb);
-	  goto postaction;
-	}
-
-	else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) {
-	  check_malloced_chunk(gm, mem, nb);
-	  goto postaction;
-	}
-      }
-    }
-    else if (bytes >= MAX_REQUEST)
-      nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
-    else {
-      nb = pad_request(bytes);
-      if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) {
-	check_malloced_chunk(gm, mem, nb);
-	goto postaction;
-      }
-    }
-
-    if (nb <= gm->dvsize) {
-      size_t rsize = gm->dvsize - nb;
-      mchunkptr p = gm->dv;
-      if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
-	mchunkptr r = gm->dv = chunk_plus_offset(p, nb);
-	gm->dvsize = rsize;
-	set_size_and_pinuse_of_free_chunk(r, rsize);
-	set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
-      }
-      else { /* exhaust dv */
-	size_t dvs = gm->dvsize;
-	gm->dvsize = 0;
-	gm->dv = 0;
-	set_inuse_and_pinuse(gm, p, dvs);
-      }
-      mem = chunk2mem(p);
-      check_malloced_chunk(gm, mem, nb);
-      goto postaction;
-    }
-
-    else if (nb < gm->topsize) { /* Split top */
-      size_t rsize = gm->topsize -= nb;
-      mchunkptr p = gm->top;
-      mchunkptr r = gm->top = chunk_plus_offset(p, nb);
-      r->head = rsize | PINUSE_BIT;
-      set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
-      mem = chunk2mem(p);
-      check_top_chunk(gm, gm->top);
-      check_malloced_chunk(gm, mem, nb);
-      goto postaction;
-    }
-
-    mem = sys_alloc(gm, nb);
-
-  postaction:
-    POSTACTION(gm);
-    return mem;
-  }
-
-  return 0;
-}
-
-void dlfree(void* mem) {
-  /*
-     Consolidate freed chunks with preceding or succeeding bordering
-     free chunks, if they exist, and then place in a bin.  Intermixed
-     with special cases for top, dv, mmapped chunks, and usage errors.
-  */
-
-  if (mem != 0) {
-    mchunkptr p  = mem2chunk(mem);
-#if FOOTERS
-    mstate fm = get_mstate_for(p);
-    if (!ok_magic(fm)) {
-      USAGE_ERROR_ACTION(fm, p);
-      return;
-    }
-#else /* FOOTERS */
-#define fm gm
-#endif /* FOOTERS */
-    if (!PREACTION(fm)) {
-      check_inuse_chunk(fm, p);
-      if (RTCHECK(ok_address(fm, p) && ok_cinuse(p))) {
-	size_t psize = chunksize(p);
-	mchunkptr next = chunk_plus_offset(p, psize);
-	if (!pinuse(p)) {
-	  size_t prevsize = p->prev_foot;
-	  if ((prevsize & IS_MMAPPED_BIT) != 0) {
-	    prevsize &= ~IS_MMAPPED_BIT;
-	    psize += prevsize + MMAP_FOOT_PAD;
-	    if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
-	      fm->footprint -= psize;
-	    goto postaction;
-	  }
-	  else {
-	    mchunkptr prev = chunk_minus_offset(p, prevsize);
-	    psize += prevsize;
-	    p = prev;
-	    if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
-	      if (p != fm->dv) {
-		unlink_chunk(fm, p, prevsize);
-	      }
-	      else if ((next->head & INUSE_BITS) == INUSE_BITS) {
-		fm->dvsize = psize;
-		set_free_with_pinuse(p, psize, next);
-		goto postaction;
-	      }
-	    }
-	    else
-	      goto erroraction;
-	  }
-	}
-
-	if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
-	  if (!cinuse(next)) {  /* consolidate forward */
-	    if (next == fm->top) {
-	      size_t tsize = fm->topsize += psize;
-	      fm->top = p;
-	      p->head = tsize | PINUSE_BIT;
-	      if (p == fm->dv) {
-		fm->dv = 0;
-		fm->dvsize = 0;
-	      }
-	      if (should_trim(fm, tsize))
-		sys_trim(fm, 0);
-	      goto postaction;
-	    }
-	    else if (next == fm->dv) {
-	      size_t dsize = fm->dvsize += psize;
-	      fm->dv = p;
-	      set_size_and_pinuse_of_free_chunk(p, dsize);
-	      goto postaction;
-	    }
-	    else {
-	      size_t nsize = chunksize(next);
-	      psize += nsize;
-	      unlink_chunk(fm, next, nsize);
-	      set_size_and_pinuse_of_free_chunk(p, psize);
-	      if (p == fm->dv) {
-		fm->dvsize = psize;
-		goto postaction;
-	      }
-	    }
-	  }
-	  else
-	    set_free_with_pinuse(p, psize, next);
-
-	  if (is_small(psize)) {
-	    insert_small_chunk(fm, p, psize);
-	    check_free_chunk(fm, p);
-	  }
-	  else {
-	    tchunkptr tp = (tchunkptr)p;
-	    insert_large_chunk(fm, tp, psize);
-	    check_free_chunk(fm, p);
-	    if (--fm->release_checks == 0)
-	      release_unused_segments(fm);
-	  }
-	  goto postaction;
-	}
-      }
-    erroraction:
-      USAGE_ERROR_ACTION(fm, p);
-    postaction:
-      POSTACTION(fm);
-    }
-  }
-#if !FOOTERS
-#undef fm
-#endif /* FOOTERS */
-}
-
-void* dlcalloc(size_t n_elements, size_t elem_size) {
-  void* mem;
-  size_t req = 0;
-  if (n_elements != 0) {
-    req = n_elements * elem_size;
-    if (((n_elements | elem_size) & ~(size_t)0xffff) &&
-	(req / n_elements != elem_size))
-      req = MAX_SIZE_T; /* force downstream failure on overflow */
-  }
-  mem = dlmalloc(req);
-  if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
-    memset(mem, 0, req);
-  return mem;
-}
-
-void* dlrealloc(void* oldmem, size_t bytes) {
-  if (oldmem == 0)
-    return dlmalloc(bytes);
-#ifdef REALLOC_ZERO_BYTES_FREES
-  if (bytes == 0) {
-    dlfree(oldmem);
-    return 0;
-  }
-#endif /* REALLOC_ZERO_BYTES_FREES */
-  else {
-#if ! FOOTERS
-    mstate m = gm;
-#else /* FOOTERS */
-    mstate m = get_mstate_for(mem2chunk(oldmem));
-    if (!ok_magic(m)) {
-      USAGE_ERROR_ACTION(m, oldmem);
-      return 0;
-    }
-#endif /* FOOTERS */
-    return internal_realloc(m, oldmem, bytes);
-  }
-}
-
-void* dlmemalign(size_t alignment, size_t bytes) {
-  return internal_memalign(gm, alignment, bytes);
-}
-
-void** dlindependent_calloc(size_t n_elements, size_t elem_size,
-				 void* chunks[]) {
-  size_t sz = elem_size; /* serves as 1-element array */
-  return ialloc(gm, n_elements, &sz, 3, chunks);
-}
-
-void** dlindependent_comalloc(size_t n_elements, size_t sizes[],
-				   void* chunks[]) {
-  return ialloc(gm, n_elements, sizes, 0, chunks);
-}
-
-void* dlvalloc(size_t bytes) {
-  size_t pagesz;
-  ensure_initialization();
-  pagesz = mparams.page_size;
-  return dlmemalign(pagesz, bytes);
-}
-
-void* dlpvalloc(size_t bytes) {
-  size_t pagesz;
-  ensure_initialization();
-  pagesz = mparams.page_size;
-  return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE));
-}
-
-int dlmalloc_trim(size_t pad) {
-  ensure_initialization();
-  int result = 0;
-  if (!PREACTION(gm)) {
-    result = sys_trim(gm, pad);
-    POSTACTION(gm);
-  }
-  return result;
-}
-
-size_t dlmalloc_footprint(void) {
-  return gm->footprint;
-}
-
-size_t dlmalloc_max_footprint(void) {
-  return gm->max_footprint;
-}
-
-#if !NO_MALLINFO
-struct mallinfo dlmallinfo(void) {
-  return internal_mallinfo(gm);
-}
-#endif /* NO_MALLINFO */
-
-void dlmalloc_stats() {
-  internal_malloc_stats(gm);
-}
-
-int dlmallopt(int param_number, int value) {
-  return change_mparam(param_number, value);
-}
-
-#endif /* !ONLY_MSPACES */
-
-size_t dlmalloc_usable_size(void* mem) {
-  if (mem != 0) {
-    mchunkptr p = mem2chunk(mem);
-    if (cinuse(p))
-      return chunksize(p) - overhead_for(p);
-  }
-  return 0;
-}
-
-/* ----------------------------- user mspaces ---------------------------- */
-
-#if MSPACES
-
-static mstate init_user_mstate(char* tbase, size_t tsize) {
-  size_t msize = pad_request(sizeof(struct malloc_state));
-  mchunkptr mn;
-  mchunkptr msp = align_as_chunk(tbase);
-  mstate m = (mstate)(chunk2mem(msp));
-  memset(m, 0, msize);
-  (void)INITIAL_LOCK(&m->mutex);
-  msp->head = (msize|PINUSE_BIT|CINUSE_BIT);
-  m->seg.base = m->least_addr = tbase;
-  m->seg.size = m->footprint = m->max_footprint = tsize;
-  m->magic = mparams.magic;
-  m->release_checks = MAX_RELEASE_CHECK_RATE;
-  m->mflags = mparams.default_mflags;
-  m->extp = 0;
-  m->exts = 0;
-  disable_contiguous(m);
-  init_bins(m);
-  mn = next_chunk(mem2chunk(m));
-  init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE);
-  check_top_chunk(m, m->top);
-  return m;
-}
-
-mspace create_mspace(size_t capacity, int locked) {
-  mstate m = 0;
-  size_t msize;
-  ensure_initialization();
-  msize = pad_request(sizeof(struct malloc_state));
-  if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
-    size_t rs = ((capacity == 0)? mparams.granularity :
-		 (capacity + TOP_FOOT_SIZE + msize));
-    size_t tsize = granularity_align(rs);
-    char* tbase = (char*)(CALL_MMAP(tsize));
-    if (tbase != CMFAIL) {
-      m = init_user_mstate(tbase, tsize);
-      m->seg.sflags = IS_MMAPPED_BIT;
-      set_lock(m, locked);
-    }
-  }
-  return (mspace)m;
-}
-
-mspace create_mspace_with_base(void* base, size_t capacity, int locked) {
-  mstate m = 0;
-  size_t msize;
-  ensure_initialization();
-  msize = pad_request(sizeof(struct malloc_state));
-  if (capacity > msize + TOP_FOOT_SIZE &&
-      capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
-    m = init_user_mstate((char*)base, capacity);
-    m->seg.sflags = EXTERN_BIT;
-    set_lock(m, locked);
-  }
-  return (mspace)m;
-}
-
-int mspace_mmap_large_chunks(mspace msp, int enable) {
-  int ret = 0;
-  mstate ms = (mstate)msp;
-  if (!PREACTION(ms)) {
-    if (use_mmap(ms))
-      ret = 1;
-    if (enable)
-      enable_mmap(ms);
-    else
-      disable_mmap(ms);
-    POSTACTION(ms);
-  }
-  return ret;
-}
-
-size_t destroy_mspace(mspace msp) {
-  size_t freed = 0;
-  mstate ms = (mstate)msp;
-  if (ok_magic(ms)) {
-    msegmentptr sp = &ms->seg;
-    while (sp != 0) {
-      char* base = sp->base;
-      size_t size = sp->size;
-      flag_t flag = sp->sflags;
-      sp = sp->next;
-      if ((flag & IS_MMAPPED_BIT) && !(flag & EXTERN_BIT) &&
-	  CALL_MUNMAP(base, size) == 0)
-	freed += size;
-    }
-  }
-  else {
-    USAGE_ERROR_ACTION(ms,ms);
-  }
-  return freed;
-}
-
-/*
-  mspace versions of routines are near-clones of the global
-  versions. This is not so nice but better than the alternatives.
-*/
-
-
-void* mspace_malloc(mspace msp, size_t bytes) {
-  mstate ms = (mstate)msp;
-  if (!ok_magic(ms)) {
-    USAGE_ERROR_ACTION(ms,ms);
-    return 0;
-  }
-  if (!PREACTION(ms)) {
-    void* mem;
-    size_t nb;
-    if (bytes <= MAX_SMALL_REQUEST) {
-      bindex_t idx;
-      binmap_t smallbits;
-      nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
-      idx = small_index(nb);
-      smallbits = ms->smallmap >> idx;
-
-      if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
-	mchunkptr b, p;
-	idx += ~smallbits & 1;       /* Uses next bin if idx empty */
-	b = smallbin_at(ms, idx);
-	p = b->fd;
-	assert(chunksize(p) == small_index2size(idx));
-	unlink_first_small_chunk(ms, b, p, idx);
-	set_inuse_and_pinuse(ms, p, small_index2size(idx));
-	mem = chunk2mem(p);
-	check_malloced_chunk(ms, mem, nb);
-	goto postaction;
-      }
-
-      else if (nb > ms->dvsize) {
-	if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
-	  mchunkptr b, p, r;
-	  size_t rsize;
-	  bindex_t i;
-	  binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
-	  binmap_t leastbit = least_bit(leftbits);
-	  compute_bit2idx(leastbit, i);
-	  b = smallbin_at(ms, i);
-	  p = b->fd;
-	  assert(chunksize(p) == small_index2size(i));
-	  unlink_first_small_chunk(ms, b, p, i);
-	  rsize = small_index2size(i) - nb;
-	  /* Fit here cannot be remainderless if 4byte sizes */
-	  if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
-	    set_inuse_and_pinuse(ms, p, small_index2size(i));
-	  else {
-	    set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
-	    r = chunk_plus_offset(p, nb);
-	    set_size_and_pinuse_of_free_chunk(r, rsize);
-	    replace_dv(ms, r, rsize);
-	  }
-	  mem = chunk2mem(p);
-	  check_malloced_chunk(ms, mem, nb);
-	  goto postaction;
-	}
-
-	else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) {
-	  check_malloced_chunk(ms, mem, nb);
-	  goto postaction;
-	}
-      }
-    }
-    else if (bytes >= MAX_REQUEST)
-      nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
-    else {
-      nb = pad_request(bytes);
-      if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) {
-	check_malloced_chunk(ms, mem, nb);
-	goto postaction;
-      }
-    }
-
-    if (nb <= ms->dvsize) {
-      size_t rsize = ms->dvsize - nb;
-      mchunkptr p = ms->dv;
-      if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
-	mchunkptr r = ms->dv = chunk_plus_offset(p, nb);
-	ms->dvsize = rsize;
-	set_size_and_pinuse_of_free_chunk(r, rsize);
-	set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
-      }
-      else { /* exhaust dv */
-	size_t dvs = ms->dvsize;
-	ms->dvsize = 0;
-	ms->dv = 0;
-	set_inuse_and_pinuse(ms, p, dvs);
-      }
-      mem = chunk2mem(p);
-      check_malloced_chunk(ms, mem, nb);
-      goto postaction;
-    }
-
-    else if (nb < ms->topsize) { /* Split top */
-      size_t rsize = ms->topsize -= nb;
-      mchunkptr p = ms->top;
-      mchunkptr r = ms->top = chunk_plus_offset(p, nb);
-      r->head = rsize | PINUSE_BIT;
-      set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
-      mem = chunk2mem(p);
-      check_top_chunk(ms, ms->top);
-      check_malloced_chunk(ms, mem, nb);
-      goto postaction;
-    }
-
-    mem = sys_alloc(ms, nb);
-
-  postaction:
-    POSTACTION(ms);
-    return mem;
-  }
-
-  return 0;
-}
-
-void mspace_free(mspace msp, void* mem) {
-  if (mem != 0) {
-    mchunkptr p  = mem2chunk(mem);
-#if FOOTERS
-    mstate fm = get_mstate_for(p);
-#else /* FOOTERS */
-    mstate fm = (mstate)msp;
-#endif /* FOOTERS */
-    if (!ok_magic(fm)) {
-      USAGE_ERROR_ACTION(fm, p);
-      return;
-    }
-    if (!PREACTION(fm)) {
-      check_inuse_chunk(fm, p);
-      if (RTCHECK(ok_address(fm, p) && ok_cinuse(p))) {
-	size_t psize = chunksize(p);
-	mchunkptr next = chunk_plus_offset(p, psize);
-	if (!pinuse(p)) {
-	  size_t prevsize = p->prev_foot;
-	  if ((prevsize & IS_MMAPPED_BIT) != 0) {
-	    prevsize &= ~IS_MMAPPED_BIT;
-	    psize += prevsize + MMAP_FOOT_PAD;
-	    if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
-	      fm->footprint -= psize;
-	    goto postaction;
-	  }
-	  else {
-	    mchunkptr prev = chunk_minus_offset(p, prevsize);
-	    psize += prevsize;
-	    p = prev;
-	    if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
-	      if (p != fm->dv) {
-		unlink_chunk(fm, p, prevsize);
-	      }
-	      else if ((next->head & INUSE_BITS) == INUSE_BITS) {
-		fm->dvsize = psize;
-		set_free_with_pinuse(p, psize, next);
-		goto postaction;
-	      }
-	    }
-	    else
-	      goto erroraction;
-	  }
-	}
-
-	if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
-	  if (!cinuse(next)) {  /* consolidate forward */
-	    if (next == fm->top) {
-	      size_t tsize = fm->topsize += psize;
-	      fm->top = p;
-	      p->head = tsize | PINUSE_BIT;
-	      if (p == fm->dv) {
-		fm->dv = 0;
-		fm->dvsize = 0;
-	      }
-	      if (should_trim(fm, tsize))
-		sys_trim(fm, 0);
-	      goto postaction;
-	    }
-	    else if (next == fm->dv) {
-	      size_t dsize = fm->dvsize += psize;
-	      fm->dv = p;
-	      set_size_and_pinuse_of_free_chunk(p, dsize);
-	      goto postaction;
-	    }
-	    else {
-	      size_t nsize = chunksize(next);
-	      psize += nsize;
-	      unlink_chunk(fm, next, nsize);
-	      set_size_and_pinuse_of_free_chunk(p, psize);
-	      if (p == fm->dv) {
-		fm->dvsize = psize;
-		goto postaction;
-	      }
-	    }
-	  }
-	  else
-	    set_free_with_pinuse(p, psize, next);
-
-	  if (is_small(psize)) {
-	    insert_small_chunk(fm, p, psize);
-	    check_free_chunk(fm, p);
-	  }
-	  else {
-	    tchunkptr tp = (tchunkptr)p;
-	    insert_large_chunk(fm, tp, psize);
-	    check_free_chunk(fm, p);
-	    if (--fm->release_checks == 0)
-	      release_unused_segments(fm);
-	  }
-	  goto postaction;
-	}
-      }
-    erroraction:
-      USAGE_ERROR_ACTION(fm, p);
-    postaction:
-      POSTACTION(fm);
-    }
-  }
-}
-
-void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) {
-  void* mem;
-  size_t req = 0;
-  mstate ms = (mstate)msp;
-  if (!ok_magic(ms)) {
-    USAGE_ERROR_ACTION(ms,ms);
-    return 0;
-  }
-  if (n_elements != 0) {
-    req = n_elements * elem_size;
-    if (((n_elements | elem_size) & ~(size_t)0xffff) &&
-	(req / n_elements != elem_size))
-      req = MAX_SIZE_T; /* force downstream failure on overflow */
-  }
-  mem = internal_malloc(ms, req);
-  if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
-    memset(mem, 0, req);
-  return mem;
-}
-
-void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) {
-  if (oldmem == 0)
-    return mspace_malloc(msp, bytes);
-#ifdef REALLOC_ZERO_BYTES_FREES
-  if (bytes == 0) {
-    mspace_free(msp, oldmem);
-    return 0;
-  }
-#endif /* REALLOC_ZERO_BYTES_FREES */
-  else {
-#if FOOTERS
-    mchunkptr p  = mem2chunk(oldmem);
-    mstate ms = get_mstate_for(p);
-#else /* FOOTERS */
-    mstate ms = (mstate)msp;
-#endif /* FOOTERS */
-    if (!ok_magic(ms)) {
-      USAGE_ERROR_ACTION(ms,ms);
-      return 0;
-    }
-    return internal_realloc(ms, oldmem, bytes);
-  }
-}
-
-void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) {
-  mstate ms = (mstate)msp;
-  if (!ok_magic(ms)) {
-    USAGE_ERROR_ACTION(ms,ms);
-    return 0;
-  }
-  return internal_memalign(ms, alignment, bytes);
-}
-
-void** mspace_independent_calloc(mspace msp, size_t n_elements,
-				 size_t elem_size, void* chunks[]) {
-  size_t sz = elem_size; /* serves as 1-element array */
-  mstate ms = (mstate)msp;
-  if (!ok_magic(ms)) {
-    USAGE_ERROR_ACTION(ms,ms);
-    return 0;
-  }
-  return ialloc(ms, n_elements, &sz, 3, chunks);
-}
-
-void** mspace_independent_comalloc(mspace msp, size_t n_elements,
-				   size_t sizes[], void* chunks[]) {
-  mstate ms = (mstate)msp;
-  if (!ok_magic(ms)) {
-    USAGE_ERROR_ACTION(ms,ms);
-    return 0;
-  }
-  return ialloc(ms, n_elements, sizes, 0, chunks);
-}
-
-int mspace_trim(mspace msp, size_t pad) {
-  int result = 0;
-  mstate ms = (mstate)msp;
-  if (ok_magic(ms)) {
-    if (!PREACTION(ms)) {
-      result = sys_trim(ms, pad);
-      POSTACTION(ms);
-    }
-  }
-  else {
-    USAGE_ERROR_ACTION(ms,ms);
-  }
-  return result;
-}
-
-void mspace_malloc_stats(mspace msp) {
-  mstate ms = (mstate)msp;
-  if (ok_magic(ms)) {
-    internal_malloc_stats(ms);
-  }
-  else {
-    USAGE_ERROR_ACTION(ms,ms);
-  }
-}
-
-size_t mspace_footprint(mspace msp) {
-  size_t result = 0;
-  mstate ms = (mstate)msp;
-  if (ok_magic(ms)) {
-    result = ms->footprint;
-  }
-  else {
-    USAGE_ERROR_ACTION(ms,ms);
-  }
-  return result;
-}
-
-
-size_t mspace_max_footprint(mspace msp) {
-  size_t result = 0;
-  mstate ms = (mstate)msp;
-  if (ok_magic(ms)) {
-    result = ms->max_footprint;
-  }
-  else {
-    USAGE_ERROR_ACTION(ms,ms);
-  }
-  return result;
-}
-
-
-#if !NO_MALLINFO
-struct mallinfo mspace_mallinfo(mspace msp) {
-  mstate ms = (mstate)msp;
-  if (!ok_magic(ms)) {
-    USAGE_ERROR_ACTION(ms,ms);
-  }
-  return internal_mallinfo(ms);
-}
-#endif /* NO_MALLINFO */
-
-size_t mspace_usable_size(void* mem) {
-  if (mem != 0) {
-    mchunkptr p = mem2chunk(mem);
-    if (cinuse(p))
-      return chunksize(p) - overhead_for(p);
-  }
-  return 0;
-}
-
-int mspace_mallopt(int param_number, int value) {
-  return change_mparam(param_number, value);
-}
-
-#endif /* MSPACES */
-
-/* -------------------- Alternative MORECORE functions ------------------- */
-
-/*
-  Guidelines for creating a custom version of MORECORE:
-
-  * For best performance, MORECORE should allocate in multiples of pagesize.
-  * MORECORE may allocate more memory than requested. (Or even less,
-      but this will usually result in a malloc failure.)
-  * MORECORE must not allocate memory when given argument zero, but
-      instead return one past the end address of memory from previous
-      nonzero call.
-  * For best performance, consecutive calls to MORECORE with positive
-      arguments should return increasing addresses, indicating that
-      space has been contiguously extended.
-  * Even though consecutive calls to MORECORE need not return contiguous
-      addresses, it must be OK for malloc'ed chunks to span multiple
-      regions in those cases where they do happen to be contiguous.
-  * MORECORE need not handle negative arguments -- it may instead
-      just return MFAIL when given negative arguments.
-      Negative arguments are always multiples of pagesize. MORECORE
-      must not misinterpret negative args as large positive unsigned
-      args. You can suppress all such calls from even occurring by defining
-      MORECORE_CANNOT_TRIM,
-
-  As an example alternative MORECORE, here is a custom allocator
-  kindly contributed for pre-OSX macOS.  It uses virtually but not
-  necessarily physically contiguous non-paged memory (locked in,
-  present and won't get swapped out).  You can use it by uncommenting
-  this section, adding some #includes, and setting up the appropriate
-  defines above:
-
-      #define MORECORE osMoreCore
-
-  There is also a shutdown routine that should somehow be called for
-  cleanup upon program exit.
-
-  #define MAX_POOL_ENTRIES 100
-  #define MINIMUM_MORECORE_SIZE  (64 * 1024U)
-  static int next_os_pool;
-  void *our_os_pools[MAX_POOL_ENTRIES];
-
-  void *osMoreCore(int size)
-  {
-    void *ptr = 0;
-    static void *sbrk_top = 0;
-
-    if (size > 0)
-    {
-      if (size < MINIMUM_MORECORE_SIZE)
-	 size = MINIMUM_MORECORE_SIZE;
-      if (CurrentExecutionLevel() == kTaskLevel)
-	 ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0);
-      if (ptr == 0)
-      {
-	return (void *) MFAIL;
-      }
-      // save ptrs so they can be freed during cleanup
-      our_os_pools[next_os_pool] = ptr;
-      next_os_pool++;
-      ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK);
-      sbrk_top = (char *) ptr + size;
-      return ptr;
-    }
-    else if (size < 0)
-    {
-      // we don't currently support shrink behavior
-      return (void *) MFAIL;
-    }
-    else
-    {
-      return sbrk_top;
-    }
-  }
-
-  // cleanup any allocated memory pools
-  // called as last thing before shutting down driver
-
-  void osCleanupMem(void)
-  {
-    void **ptr;
-
-    for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++)
-      if (*ptr)
-      {
-	 PoolDeallocate(*ptr);
-	 *ptr = 0;
-      }
-  }
-
-*/
-
-
-/* -----------------------------------------------------------------------
-History:
-    V2.8.4 (not yet released)
-      * Add mspace_mmap_large_chunks; thanks to Jean Brouwers
-      * Fix insufficient sys_alloc padding when using 16byte alignment
-      * Fix bad error check in mspace_footprint
-      * Adaptations for ptmalloc, courtesy of Wolfram Gloger.
-      * Reentrant spin locks, courtesy of Earl Chew and others
-      * Win32 improvements, courtesy of Niall Douglas and Earl Chew
-      * Add NO_SEGMENT_TRAVERSAL and MAX_RELEASE_CHECK_RATE options
-      * Extension hook in malloc_state
-      * Various small adjustments to reduce warnings on some compilers
-      * Various configuration extensions/changes for more platforms. Thanks
-	 to all who contributed these.
-
-    V2.8.3 Thu Sep 22 11:16:32 2005  Doug Lea  (dl at gee)
-      * Add max_footprint functions
-      * Ensure all appropriate literals are size_t
-      * Fix conditional compilation problem for some #define settings
-      * Avoid concatenating segments with the one provided
-	in create_mspace_with_base
-      * Rename some variables to avoid compiler shadowing warnings
-      * Use explicit lock initialization.
-      * Better handling of sbrk interference.
-      * Simplify and fix segment insertion, trimming and mspace_destroy
-      * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x
-      * Thanks especially to Dennis Flanagan for help on these.
-
-    V2.8.2 Sun Jun 12 16:01:10 2005  Doug Lea  (dl at gee)
-      * Fix memalign brace error.
-
-    V2.8.1 Wed Jun  8 16:11:46 2005  Doug Lea  (dl at gee)
-      * Fix improper #endif nesting in C++
-      * Add explicit casts needed for C++
-
-    V2.8.0 Mon May 30 14:09:02 2005  Doug Lea  (dl at gee)
-      * Use trees for large bins
-      * Support mspaces
-      * Use segments to unify sbrk-based and mmap-based system allocation,
-	removing need for emulation on most platforms without sbrk.
-      * Default safety checks
-      * Optional footer checks. Thanks to William Robertson for the idea.
-      * Internal code refactoring
-      * Incorporate suggestions and platform-specific changes.
-	Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas,
-	Aaron Bachmann,  Emery Berger, and others.
-      * Speed up non-fastbin processing enough to remove fastbins.
-      * Remove useless cfree() to avoid conflicts with other apps.
-      * Remove internal memcpy, memset. Compilers handle builtins better.
-      * Remove some options that no one ever used and rename others.
-
-    V2.7.2 Sat Aug 17 09:07:30 2002  Doug Lea  (dl at gee)
-      * Fix malloc_state bitmap array misdeclaration
-
-    V2.7.1 Thu Jul 25 10:58:03 2002  Doug Lea  (dl at gee)
-      * Allow tuning of FIRST_SORTED_BIN_SIZE
-      * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte.
-      * Better detection and support for non-contiguousness of MORECORE.
-	Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger
-      * Bypass most of malloc if no frees. Thanks To Emery Berger.
-      * Fix freeing of old top non-contiguous chunk im sysmalloc.
-      * Raised default trim and map thresholds to 256K.
-      * Fix mmap-related #defines. Thanks to Lubos Lunak.
-      * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield.
-      * Branch-free bin calculation
-      * Default trim and mmap thresholds now 256K.
-
-    V2.7.0 Sun Mar 11 14:14:06 2001  Doug Lea  (dl at gee)
-      * Introduce independent_comalloc and independent_calloc.
-	Thanks to Michael Pachos for motivation and help.
-      * Make optional .h file available
-      * Allow > 2GB requests on 32bit systems.
-      * new WIN32 sbrk, mmap, munmap, lock code from <Walter@GeNeSys-e.de>.
-	Thanks also to Andreas Mueller <a.mueller at paradatec.de>,
-	and Anonymous.
-      * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for
-	helping test this.)
-      * memalign: check alignment arg
-      * realloc: don't try to shift chunks backwards, since this
-	leads to  more fragmentation in some programs and doesn't
-	seem to help in any others.
-      * Collect all cases in malloc requiring system memory into sysmalloc
-      * Use mmap as backup to sbrk
-      * Place all internal state in malloc_state
-      * Introduce fastbins (although similar to 2.5.1)
-      * Many minor tunings and cosmetic improvements
-      * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK
-      * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS
-	Thanks to Tony E. Bennett <tbennett@nvidia.com> and others.
-      * Include errno.h to support default failure action.
-
-    V2.6.6 Sun Dec  5 07:42:19 1999  Doug Lea  (dl at gee)
-      * return null for negative arguments
-      * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com>
-	 * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h'
-	  (e.g. WIN32 platforms)
-	 * Cleanup header file inclusion for WIN32 platforms
-	 * Cleanup code to avoid Microsoft Visual C++ compiler complaints
-	 * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing
-	   memory allocation routines
-	 * Set 'malloc_getpagesize' for WIN32 platforms (needs more work)
-	 * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to
-	   usage of 'assert' in non-WIN32 code
-	 * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to
-	   avoid infinite loop
-      * Always call 'fREe()' rather than 'free()'
-
-    V2.6.5 Wed Jun 17 15:57:31 1998  Doug Lea  (dl at gee)
-      * Fixed ordering problem with boundary-stamping
-
-    V2.6.3 Sun May 19 08:17:58 1996  Doug Lea  (dl at gee)
-      * Added pvalloc, as recommended by H.J. Liu
-      * Added 64bit pointer support mainly from Wolfram Gloger
-      * Added anonymously donated WIN32 sbrk emulation
-      * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen
-      * malloc_extend_top: fix mask error that caused wastage after
-	foreign sbrks
-      * Add linux mremap support code from HJ Liu
-
-    V2.6.2 Tue Dec  5 06:52:55 1995  Doug Lea  (dl at gee)
-      * Integrated most documentation with the code.
-      * Add support for mmap, with help from
-	Wolfram Gloger (Gloger@lrz.uni-muenchen.de).
-      * Use last_remainder in more cases.
-      * Pack bins using idea from  colin@nyx10.cs.du.edu
-      * Use ordered bins instead of best-fit threshold
-      * Eliminate block-local decls to simplify tracing and debugging.
-      * Support another case of realloc via move into top
-      * Fix error occurring when initial sbrk_base not word-aligned.
-      * Rely on page size for units instead of SBRK_UNIT to
-	avoid surprises about sbrk alignment conventions.
-      * Add mallinfo, mallopt. Thanks to Raymond Nijssen
-	(raymond@es.ele.tue.nl) for the suggestion.
-      * Add `pad' argument to malloc_trim and top_pad mallopt parameter.
-      * More precautions for cases where other routines call sbrk,
-	courtesy of Wolfram Gloger (Gloger@lrz.uni-muenchen.de).
-      * Added macros etc., allowing use in linux libc from
-	H.J. Lu (hjl@gnu.ai.mit.edu)
-      * Inverted this history list
-
-    V2.6.1 Sat Dec  2 14:10:57 1995  Doug Lea  (dl at gee)
-      * Re-tuned and fixed to behave more nicely with V2.6.0 changes.
-      * Removed all preallocation code since under current scheme
-	the work required to undo bad preallocations exceeds
-	the work saved in good cases for most test programs.
-      * No longer use return list or unconsolidated bins since
-	no scheme using them consistently outperforms those that don't
-	given above changes.
-      * Use best fit for very large chunks to prevent some worst-cases.
-      * Added some support for debugging
-
-    V2.6.0 Sat Nov  4 07:05:23 1995  Doug Lea  (dl at gee)
-      * Removed footers when chunks are in use. Thanks to
-	Paul Wilson (wilson@cs.texas.edu) for the suggestion.
-
-    V2.5.4 Wed Nov  1 07:54:51 1995  Doug Lea  (dl at gee)
-      * Added malloc_trim, with help from Wolfram Gloger
-	(wmglo@Dent.MED.Uni-Muenchen.DE).
-
-    V2.5.3 Tue Apr 26 10:16:01 1994  Doug Lea  (dl at g)
-
-    V2.5.2 Tue Apr  5 16:20:40 1994  Doug Lea  (dl at g)
-      * realloc: try to expand in both directions
-      * malloc: swap order of clean-bin strategy;
-      * realloc: only conditionally expand backwards
-      * Try not to scavenge used bins
-      * Use bin counts as a guide to preallocation
-      * Occasionally bin return list chunks in first scan
-      * Add a few optimizations from colin@nyx10.cs.du.edu
-
-    V2.5.1 Sat Aug 14 15:40:43 1993  Doug Lea  (dl at g)
-      * faster bin computation & slightly different binning
-      * merged all consolidations to one part of malloc proper
-	 (eliminating old malloc_find_space & malloc_clean_bin)
-      * Scan 2 returns chunks (not just 1)
-      * Propagate failure in realloc if malloc returns 0
-      * Add stuff to allow compilation on non-ANSI compilers
-	  from kpv@research.att.com
-
-    V2.5 Sat Aug  7 07:41:59 1993  Doug Lea  (dl at g.oswego.edu)
-      * removed potential for odd address access in prev_chunk
-      * removed dependency on getpagesize.h
-      * misc cosmetics and a bit more internal documentation
-      * anticosmetics: mangled names in macros to evade debugger strangeness
-      * tested on sparc, hp-700, dec-mips, rs6000
-	  with gcc & native cc (hp, dec only) allowing
-	  Detlefs & Zorn comparison study (in SIGPLAN Notices.)
-
-    Trial version Fri Aug 28 13:14:29 1992  Doug Lea  (dl at g.oswego.edu)
-      * Based loosely on libg++-1.2X malloc. (It retains some of the overall
-	 structure of old version,  but most details differ.)
-
-*/
-- 
gitgitgadget